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); |
1c4c40c4 | 53 | static int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst, |
47209abd | 54 | const struct flowi *fl, int family); |
1c4c40c4 | 55 | |
1da177e4 | 56 | |
29fa0b30 WY |
57 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, |
58 | int dir); | |
59 | ||
77681021 | 60 | static inline int |
200ce96e | 61 | __xfrm4_selector_match(const struct xfrm_selector *sel, const struct flowi *fl) |
77681021 AM |
62 | { |
63 | return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) && | |
64 | addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) && | |
65 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && | |
66 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && | |
67 | (fl->proto == sel->proto || !sel->proto) && | |
68 | (fl->oif == sel->ifindex || !sel->ifindex); | |
69 | } | |
70 | ||
71 | static inline int | |
200ce96e | 72 | __xfrm6_selector_match(const struct xfrm_selector *sel, const struct flowi *fl) |
77681021 AM |
73 | { |
74 | return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) && | |
75 | addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) && | |
76 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && | |
77 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && | |
78 | (fl->proto == sel->proto || !sel->proto) && | |
79 | (fl->oif == sel->ifindex || !sel->ifindex); | |
80 | } | |
81 | ||
200ce96e | 82 | int xfrm_selector_match(const struct xfrm_selector *sel, const struct flowi *fl, |
e1ad2ab2 | 83 | unsigned short family) |
77681021 AM |
84 | { |
85 | switch (family) { | |
86 | case AF_INET: | |
87 | return __xfrm4_selector_match(sel, fl); | |
88 | case AF_INET6: | |
89 | return __xfrm6_selector_match(sel, fl); | |
90 | } | |
91 | return 0; | |
92 | } | |
93 | ||
c5b3cf46 | 94 | static inline struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, |
6418c4e0 DM |
95 | const xfrm_address_t *saddr, |
96 | const xfrm_address_t *daddr, | |
9bb182a7 YH |
97 | int family) |
98 | { | |
99 | struct xfrm_policy_afinfo *afinfo; | |
100 | struct dst_entry *dst; | |
101 | ||
102 | afinfo = xfrm_policy_get_afinfo(family); | |
103 | if (unlikely(afinfo == NULL)) | |
104 | return ERR_PTR(-EAFNOSUPPORT); | |
105 | ||
c5b3cf46 | 106 | dst = afinfo->dst_lookup(net, tos, saddr, daddr); |
9bb182a7 YH |
107 | |
108 | xfrm_policy_put_afinfo(afinfo); | |
109 | ||
110 | return dst; | |
111 | } | |
112 | ||
25ee3286 | 113 | static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos, |
9bb182a7 YH |
114 | xfrm_address_t *prev_saddr, |
115 | xfrm_address_t *prev_daddr, | |
25ee3286 | 116 | int family) |
1da177e4 | 117 | { |
c5b3cf46 | 118 | struct net *net = xs_net(x); |
66cdb3ca HX |
119 | xfrm_address_t *saddr = &x->props.saddr; |
120 | xfrm_address_t *daddr = &x->id.daddr; | |
66cdb3ca HX |
121 | struct dst_entry *dst; |
122 | ||
9bb182a7 | 123 | if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) { |
66cdb3ca | 124 | saddr = x->coaddr; |
9bb182a7 YH |
125 | daddr = prev_daddr; |
126 | } | |
127 | if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) { | |
128 | saddr = prev_saddr; | |
66cdb3ca | 129 | daddr = x->coaddr; |
9bb182a7 | 130 | } |
1da177e4 | 131 | |
c5b3cf46 | 132 | dst = __xfrm_dst_lookup(net, tos, saddr, daddr, family); |
9bb182a7 YH |
133 | |
134 | if (!IS_ERR(dst)) { | |
135 | if (prev_saddr != saddr) | |
136 | memcpy(prev_saddr, saddr, sizeof(*prev_saddr)); | |
137 | if (prev_daddr != daddr) | |
138 | memcpy(prev_daddr, daddr, sizeof(*prev_daddr)); | |
139 | } | |
1da177e4 | 140 | |
66cdb3ca | 141 | return dst; |
1da177e4 | 142 | } |
1da177e4 | 143 | |
1da177e4 LT |
144 | static inline unsigned long make_jiffies(long secs) |
145 | { | |
146 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
147 | return MAX_SCHEDULE_TIMEOUT-1; | |
148 | else | |
a716c119 | 149 | return secs*HZ; |
1da177e4 LT |
150 | } |
151 | ||
152 | static void xfrm_policy_timer(unsigned long data) | |
153 | { | |
154 | struct xfrm_policy *xp = (struct xfrm_policy*)data; | |
9d729f72 | 155 | unsigned long now = get_seconds(); |
1da177e4 LT |
156 | long next = LONG_MAX; |
157 | int warn = 0; | |
158 | int dir; | |
159 | ||
160 | read_lock(&xp->lock); | |
161 | ||
ea2dea9d | 162 | if (unlikely(xp->walk.dead)) |
1da177e4 LT |
163 | goto out; |
164 | ||
77d8d7a6 | 165 | dir = xfrm_policy_id2dir(xp->index); |
1da177e4 LT |
166 | |
167 | if (xp->lft.hard_add_expires_seconds) { | |
168 | long tmo = xp->lft.hard_add_expires_seconds + | |
169 | xp->curlft.add_time - now; | |
170 | if (tmo <= 0) | |
171 | goto expired; | |
172 | if (tmo < next) | |
173 | next = tmo; | |
174 | } | |
175 | if (xp->lft.hard_use_expires_seconds) { | |
176 | long tmo = xp->lft.hard_use_expires_seconds + | |
177 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
178 | if (tmo <= 0) | |
179 | goto expired; | |
180 | if (tmo < next) | |
181 | next = tmo; | |
182 | } | |
183 | if (xp->lft.soft_add_expires_seconds) { | |
184 | long tmo = xp->lft.soft_add_expires_seconds + | |
185 | xp->curlft.add_time - now; | |
186 | if (tmo <= 0) { | |
187 | warn = 1; | |
188 | tmo = XFRM_KM_TIMEOUT; | |
189 | } | |
190 | if (tmo < next) | |
191 | next = tmo; | |
192 | } | |
193 | if (xp->lft.soft_use_expires_seconds) { | |
194 | long tmo = xp->lft.soft_use_expires_seconds + | |
195 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
196 | if (tmo <= 0) { | |
197 | warn = 1; | |
198 | tmo = XFRM_KM_TIMEOUT; | |
199 | } | |
200 | if (tmo < next) | |
201 | next = tmo; | |
202 | } | |
203 | ||
204 | if (warn) | |
6c5c8ca7 | 205 | km_policy_expired(xp, dir, 0, 0); |
1da177e4 LT |
206 | if (next != LONG_MAX && |
207 | !mod_timer(&xp->timer, jiffies + make_jiffies(next))) | |
208 | xfrm_pol_hold(xp); | |
209 | ||
210 | out: | |
211 | read_unlock(&xp->lock); | |
212 | xfrm_pol_put(xp); | |
213 | return; | |
214 | ||
215 | expired: | |
216 | read_unlock(&xp->lock); | |
4666faab | 217 | if (!xfrm_policy_delete(xp, dir)) |
6c5c8ca7 | 218 | km_policy_expired(xp, dir, 1, 0); |
1da177e4 LT |
219 | xfrm_pol_put(xp); |
220 | } | |
221 | ||
fe1a5f03 TT |
222 | static struct flow_cache_object *xfrm_policy_flo_get(struct flow_cache_object *flo) |
223 | { | |
224 | struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo); | |
225 | ||
226 | if (unlikely(pol->walk.dead)) | |
227 | flo = NULL; | |
228 | else | |
229 | xfrm_pol_hold(pol); | |
230 | ||
231 | return flo; | |
232 | } | |
233 | ||
234 | static int xfrm_policy_flo_check(struct flow_cache_object *flo) | |
235 | { | |
236 | struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo); | |
237 | ||
238 | return !pol->walk.dead; | |
239 | } | |
240 | ||
241 | static void xfrm_policy_flo_delete(struct flow_cache_object *flo) | |
242 | { | |
243 | xfrm_pol_put(container_of(flo, struct xfrm_policy, flo)); | |
244 | } | |
245 | ||
246 | static const struct flow_cache_ops xfrm_policy_fc_ops = { | |
247 | .get = xfrm_policy_flo_get, | |
248 | .check = xfrm_policy_flo_check, | |
249 | .delete = xfrm_policy_flo_delete, | |
250 | }; | |
1da177e4 LT |
251 | |
252 | /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2 | |
253 | * SPD calls. | |
254 | */ | |
255 | ||
0331b1f3 | 256 | struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp) |
1da177e4 LT |
257 | { |
258 | struct xfrm_policy *policy; | |
259 | ||
0da974f4 | 260 | policy = kzalloc(sizeof(struct xfrm_policy), gfp); |
1da177e4 LT |
261 | |
262 | if (policy) { | |
0331b1f3 | 263 | write_pnet(&policy->xp_net, net); |
12a169e7 | 264 | INIT_LIST_HEAD(&policy->walk.all); |
2518c7c2 DM |
265 | INIT_HLIST_NODE(&policy->bydst); |
266 | INIT_HLIST_NODE(&policy->byidx); | |
1da177e4 | 267 | rwlock_init(&policy->lock); |
2518c7c2 | 268 | atomic_set(&policy->refcnt, 1); |
b24b8a24 PE |
269 | setup_timer(&policy->timer, xfrm_policy_timer, |
270 | (unsigned long)policy); | |
fe1a5f03 | 271 | policy->flo.ops = &xfrm_policy_fc_ops; |
1da177e4 LT |
272 | } |
273 | return policy; | |
274 | } | |
275 | EXPORT_SYMBOL(xfrm_policy_alloc); | |
276 | ||
277 | /* Destroy xfrm_policy: descendant resources must be released to this moment. */ | |
278 | ||
64c31b3f | 279 | void xfrm_policy_destroy(struct xfrm_policy *policy) |
1da177e4 | 280 | { |
12a169e7 | 281 | BUG_ON(!policy->walk.dead); |
1da177e4 | 282 | |
1da177e4 LT |
283 | if (del_timer(&policy->timer)) |
284 | BUG(); | |
285 | ||
03e1ad7b | 286 | security_xfrm_policy_free(policy->security); |
1da177e4 LT |
287 | kfree(policy); |
288 | } | |
64c31b3f | 289 | EXPORT_SYMBOL(xfrm_policy_destroy); |
1da177e4 | 290 | |
1da177e4 LT |
291 | /* Rule must be locked. Release descentant resources, announce |
292 | * entry dead. The rule must be unlinked from lists to the moment. | |
293 | */ | |
294 | ||
295 | static void xfrm_policy_kill(struct xfrm_policy *policy) | |
296 | { | |
12a169e7 | 297 | policy->walk.dead = 1; |
1da177e4 | 298 | |
285ead17 | 299 | atomic_inc(&policy->genid); |
1da177e4 | 300 | |
285ead17 TT |
301 | if (del_timer(&policy->timer)) |
302 | xfrm_pol_put(policy); | |
303 | ||
304 | xfrm_pol_put(policy); | |
1da177e4 LT |
305 | } |
306 | ||
2518c7c2 DM |
307 | static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024; |
308 | ||
e92303f8 | 309 | static inline unsigned int idx_hash(struct net *net, u32 index) |
2518c7c2 | 310 | { |
e92303f8 | 311 | return __idx_hash(index, net->xfrm.policy_idx_hmask); |
2518c7c2 DM |
312 | } |
313 | ||
5f803b58 DM |
314 | static struct hlist_head *policy_hash_bysel(struct net *net, |
315 | const struct xfrm_selector *sel, | |
316 | unsigned short family, int dir) | |
2518c7c2 | 317 | { |
1121994c | 318 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
319 | unsigned int hash = __sel_hash(sel, family, hmask); |
320 | ||
321 | return (hash == hmask + 1 ? | |
1121994c AD |
322 | &net->xfrm.policy_inexact[dir] : |
323 | net->xfrm.policy_bydst[dir].table + hash); | |
2518c7c2 DM |
324 | } |
325 | ||
5f803b58 DM |
326 | static struct hlist_head *policy_hash_direct(struct net *net, |
327 | const xfrm_address_t *daddr, | |
328 | const xfrm_address_t *saddr, | |
329 | unsigned short family, int dir) | |
2518c7c2 | 330 | { |
1121994c | 331 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
332 | unsigned int hash = __addr_hash(daddr, saddr, family, hmask); |
333 | ||
1121994c | 334 | return net->xfrm.policy_bydst[dir].table + hash; |
2518c7c2 DM |
335 | } |
336 | ||
2518c7c2 DM |
337 | static void xfrm_dst_hash_transfer(struct hlist_head *list, |
338 | struct hlist_head *ndsttable, | |
339 | unsigned int nhashmask) | |
340 | { | |
b791160b | 341 | struct hlist_node *entry, *tmp, *entry0 = NULL; |
2518c7c2 | 342 | struct xfrm_policy *pol; |
b791160b | 343 | unsigned int h0 = 0; |
2518c7c2 | 344 | |
b791160b | 345 | redo: |
2518c7c2 DM |
346 | hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) { |
347 | unsigned int h; | |
348 | ||
349 | h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr, | |
350 | pol->family, nhashmask); | |
b791160b YH |
351 | if (!entry0) { |
352 | hlist_del(entry); | |
353 | hlist_add_head(&pol->bydst, ndsttable+h); | |
354 | h0 = h; | |
355 | } else { | |
356 | if (h != h0) | |
357 | continue; | |
358 | hlist_del(entry); | |
359 | hlist_add_after(entry0, &pol->bydst); | |
360 | } | |
361 | entry0 = entry; | |
362 | } | |
363 | if (!hlist_empty(list)) { | |
364 | entry0 = NULL; | |
365 | goto redo; | |
2518c7c2 DM |
366 | } |
367 | } | |
368 | ||
369 | static void xfrm_idx_hash_transfer(struct hlist_head *list, | |
370 | struct hlist_head *nidxtable, | |
371 | unsigned int nhashmask) | |
372 | { | |
373 | struct hlist_node *entry, *tmp; | |
374 | struct xfrm_policy *pol; | |
375 | ||
376 | hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) { | |
377 | unsigned int h; | |
378 | ||
379 | h = __idx_hash(pol->index, nhashmask); | |
380 | hlist_add_head(&pol->byidx, nidxtable+h); | |
381 | } | |
382 | } | |
383 | ||
384 | static unsigned long xfrm_new_hash_mask(unsigned int old_hmask) | |
385 | { | |
386 | return ((old_hmask + 1) << 1) - 1; | |
387 | } | |
388 | ||
66caf628 | 389 | static void xfrm_bydst_resize(struct net *net, int dir) |
2518c7c2 | 390 | { |
66caf628 | 391 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
392 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
393 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
66caf628 | 394 | struct hlist_head *odst = net->xfrm.policy_bydst[dir].table; |
44e36b42 | 395 | struct hlist_head *ndst = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
396 | int i; |
397 | ||
398 | if (!ndst) | |
399 | return; | |
400 | ||
401 | write_lock_bh(&xfrm_policy_lock); | |
402 | ||
403 | for (i = hmask; i >= 0; i--) | |
404 | xfrm_dst_hash_transfer(odst + i, ndst, nhashmask); | |
405 | ||
66caf628 AD |
406 | net->xfrm.policy_bydst[dir].table = ndst; |
407 | net->xfrm.policy_bydst[dir].hmask = nhashmask; | |
2518c7c2 DM |
408 | |
409 | write_unlock_bh(&xfrm_policy_lock); | |
410 | ||
44e36b42 | 411 | xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
412 | } |
413 | ||
66caf628 | 414 | static void xfrm_byidx_resize(struct net *net, int total) |
2518c7c2 | 415 | { |
66caf628 | 416 | unsigned int hmask = net->xfrm.policy_idx_hmask; |
2518c7c2 DM |
417 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
418 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
66caf628 | 419 | struct hlist_head *oidx = net->xfrm.policy_byidx; |
44e36b42 | 420 | struct hlist_head *nidx = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
421 | int i; |
422 | ||
423 | if (!nidx) | |
424 | return; | |
425 | ||
426 | write_lock_bh(&xfrm_policy_lock); | |
427 | ||
428 | for (i = hmask; i >= 0; i--) | |
429 | xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask); | |
430 | ||
66caf628 AD |
431 | net->xfrm.policy_byidx = nidx; |
432 | net->xfrm.policy_idx_hmask = nhashmask; | |
2518c7c2 DM |
433 | |
434 | write_unlock_bh(&xfrm_policy_lock); | |
435 | ||
44e36b42 | 436 | xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
437 | } |
438 | ||
66caf628 | 439 | static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total) |
2518c7c2 | 440 | { |
66caf628 AD |
441 | unsigned int cnt = net->xfrm.policy_count[dir]; |
442 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; | |
2518c7c2 DM |
443 | |
444 | if (total) | |
445 | *total += cnt; | |
446 | ||
447 | if ((hmask + 1) < xfrm_policy_hashmax && | |
448 | cnt > hmask) | |
449 | return 1; | |
450 | ||
451 | return 0; | |
452 | } | |
453 | ||
66caf628 | 454 | static inline int xfrm_byidx_should_resize(struct net *net, int total) |
2518c7c2 | 455 | { |
66caf628 | 456 | unsigned int hmask = net->xfrm.policy_idx_hmask; |
2518c7c2 DM |
457 | |
458 | if ((hmask + 1) < xfrm_policy_hashmax && | |
459 | total > hmask) | |
460 | return 1; | |
461 | ||
462 | return 0; | |
463 | } | |
464 | ||
e071041b | 465 | void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si) |
ecfd6b18 JHS |
466 | { |
467 | read_lock_bh(&xfrm_policy_lock); | |
e071041b AD |
468 | si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN]; |
469 | si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT]; | |
470 | si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD]; | |
471 | si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX]; | |
472 | si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX]; | |
473 | si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX]; | |
474 | si->spdhcnt = net->xfrm.policy_idx_hmask; | |
ecfd6b18 JHS |
475 | si->spdhmcnt = xfrm_policy_hashmax; |
476 | read_unlock_bh(&xfrm_policy_lock); | |
477 | } | |
478 | EXPORT_SYMBOL(xfrm_spd_getinfo); | |
2518c7c2 | 479 | |
ecfd6b18 | 480 | static DEFINE_MUTEX(hash_resize_mutex); |
66caf628 | 481 | static void xfrm_hash_resize(struct work_struct *work) |
2518c7c2 | 482 | { |
66caf628 | 483 | struct net *net = container_of(work, struct net, xfrm.policy_hash_work); |
2518c7c2 DM |
484 | int dir, total; |
485 | ||
486 | mutex_lock(&hash_resize_mutex); | |
487 | ||
488 | total = 0; | |
489 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
66caf628 AD |
490 | if (xfrm_bydst_should_resize(net, dir, &total)) |
491 | xfrm_bydst_resize(net, dir); | |
2518c7c2 | 492 | } |
66caf628 AD |
493 | if (xfrm_byidx_should_resize(net, total)) |
494 | xfrm_byidx_resize(net, total); | |
2518c7c2 DM |
495 | |
496 | mutex_unlock(&hash_resize_mutex); | |
497 | } | |
498 | ||
1da177e4 LT |
499 | /* Generate new index... KAME seems to generate them ordered by cost |
500 | * of an absolute inpredictability of ordering of rules. This will not pass. */ | |
1121994c | 501 | static u32 xfrm_gen_index(struct net *net, int dir) |
1da177e4 | 502 | { |
1da177e4 LT |
503 | static u32 idx_generator; |
504 | ||
505 | for (;;) { | |
2518c7c2 DM |
506 | struct hlist_node *entry; |
507 | struct hlist_head *list; | |
508 | struct xfrm_policy *p; | |
509 | u32 idx; | |
510 | int found; | |
511 | ||
1da177e4 LT |
512 | idx = (idx_generator | dir); |
513 | idx_generator += 8; | |
514 | if (idx == 0) | |
515 | idx = 8; | |
1121994c | 516 | list = net->xfrm.policy_byidx + idx_hash(net, idx); |
2518c7c2 DM |
517 | found = 0; |
518 | hlist_for_each_entry(p, entry, list, byidx) { | |
519 | if (p->index == idx) { | |
520 | found = 1; | |
1da177e4 | 521 | break; |
2518c7c2 | 522 | } |
1da177e4 | 523 | } |
2518c7c2 | 524 | if (!found) |
1da177e4 LT |
525 | return idx; |
526 | } | |
527 | } | |
528 | ||
2518c7c2 DM |
529 | static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2) |
530 | { | |
531 | u32 *p1 = (u32 *) s1; | |
532 | u32 *p2 = (u32 *) s2; | |
533 | int len = sizeof(struct xfrm_selector) / sizeof(u32); | |
534 | int i; | |
535 | ||
536 | for (i = 0; i < len; i++) { | |
537 | if (p1[i] != p2[i]) | |
538 | return 1; | |
539 | } | |
540 | ||
541 | return 0; | |
542 | } | |
543 | ||
1da177e4 LT |
544 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) |
545 | { | |
1121994c | 546 | struct net *net = xp_net(policy); |
2518c7c2 DM |
547 | struct xfrm_policy *pol; |
548 | struct xfrm_policy *delpol; | |
549 | struct hlist_head *chain; | |
a6c7ab55 | 550 | struct hlist_node *entry, *newpos; |
34f8d884 | 551 | u32 mark = policy->mark.v & policy->mark.m; |
1da177e4 LT |
552 | |
553 | write_lock_bh(&xfrm_policy_lock); | |
1121994c | 554 | chain = policy_hash_bysel(net, &policy->selector, policy->family, dir); |
2518c7c2 DM |
555 | delpol = NULL; |
556 | newpos = NULL; | |
2518c7c2 | 557 | hlist_for_each_entry(pol, entry, chain, bydst) { |
a6c7ab55 | 558 | if (pol->type == policy->type && |
2518c7c2 | 559 | !selector_cmp(&pol->selector, &policy->selector) && |
34f8d884 | 560 | (mark & pol->mark.m) == pol->mark.v && |
a6c7ab55 HX |
561 | xfrm_sec_ctx_match(pol->security, policy->security) && |
562 | !WARN_ON(delpol)) { | |
1da177e4 LT |
563 | if (excl) { |
564 | write_unlock_bh(&xfrm_policy_lock); | |
565 | return -EEXIST; | |
566 | } | |
1da177e4 LT |
567 | delpol = pol; |
568 | if (policy->priority > pol->priority) | |
569 | continue; | |
570 | } else if (policy->priority >= pol->priority) { | |
a6c7ab55 | 571 | newpos = &pol->bydst; |
1da177e4 LT |
572 | continue; |
573 | } | |
1da177e4 LT |
574 | if (delpol) |
575 | break; | |
1da177e4 LT |
576 | } |
577 | if (newpos) | |
2518c7c2 DM |
578 | hlist_add_after(newpos, &policy->bydst); |
579 | else | |
580 | hlist_add_head(&policy->bydst, chain); | |
1da177e4 | 581 | xfrm_pol_hold(policy); |
1121994c | 582 | net->xfrm.policy_count[dir]++; |
1da177e4 | 583 | atomic_inc(&flow_cache_genid); |
29fa0b30 WY |
584 | if (delpol) |
585 | __xfrm_policy_unlink(delpol, dir); | |
1121994c AD |
586 | policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir); |
587 | hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index)); | |
9d729f72 | 588 | policy->curlft.add_time = get_seconds(); |
1da177e4 LT |
589 | policy->curlft.use_time = 0; |
590 | if (!mod_timer(&policy->timer, jiffies + HZ)) | |
591 | xfrm_pol_hold(policy); | |
1121994c | 592 | list_add(&policy->walk.all, &net->xfrm.policy_all); |
1da177e4 LT |
593 | write_unlock_bh(&xfrm_policy_lock); |
594 | ||
9b78a82c | 595 | if (delpol) |
1da177e4 | 596 | xfrm_policy_kill(delpol); |
1121994c AD |
597 | else if (xfrm_bydst_should_resize(net, dir, NULL)) |
598 | schedule_work(&net->xfrm.policy_hash_work); | |
9b78a82c | 599 | |
1da177e4 LT |
600 | return 0; |
601 | } | |
602 | EXPORT_SYMBOL(xfrm_policy_insert); | |
603 | ||
8ca2e93b JHS |
604 | struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type, |
605 | int dir, struct xfrm_selector *sel, | |
ef41aaa0 EP |
606 | struct xfrm_sec_ctx *ctx, int delete, |
607 | int *err) | |
1da177e4 | 608 | { |
2518c7c2 DM |
609 | struct xfrm_policy *pol, *ret; |
610 | struct hlist_head *chain; | |
611 | struct hlist_node *entry; | |
1da177e4 | 612 | |
ef41aaa0 | 613 | *err = 0; |
1da177e4 | 614 | write_lock_bh(&xfrm_policy_lock); |
8d1211a6 | 615 | chain = policy_hash_bysel(net, sel, sel->family, dir); |
2518c7c2 DM |
616 | ret = NULL; |
617 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
618 | if (pol->type == type && | |
34f8d884 | 619 | (mark & pol->mark.m) == pol->mark.v && |
2518c7c2 DM |
620 | !selector_cmp(sel, &pol->selector) && |
621 | xfrm_sec_ctx_match(ctx, pol->security)) { | |
1da177e4 | 622 | xfrm_pol_hold(pol); |
2518c7c2 | 623 | if (delete) { |
03e1ad7b PM |
624 | *err = security_xfrm_policy_delete( |
625 | pol->security); | |
ef41aaa0 EP |
626 | if (*err) { |
627 | write_unlock_bh(&xfrm_policy_lock); | |
628 | return pol; | |
629 | } | |
29fa0b30 | 630 | __xfrm_policy_unlink(pol, dir); |
2518c7c2 DM |
631 | } |
632 | ret = pol; | |
1da177e4 LT |
633 | break; |
634 | } | |
635 | } | |
636 | write_unlock_bh(&xfrm_policy_lock); | |
637 | ||
fe1a5f03 | 638 | if (ret && delete) |
2518c7c2 | 639 | xfrm_policy_kill(ret); |
2518c7c2 | 640 | return ret; |
1da177e4 | 641 | } |
df71837d | 642 | EXPORT_SYMBOL(xfrm_policy_bysel_ctx); |
1da177e4 | 643 | |
8ca2e93b JHS |
644 | struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type, |
645 | int dir, u32 id, int delete, int *err) | |
1da177e4 | 646 | { |
2518c7c2 DM |
647 | struct xfrm_policy *pol, *ret; |
648 | struct hlist_head *chain; | |
649 | struct hlist_node *entry; | |
1da177e4 | 650 | |
b5505c6e HX |
651 | *err = -ENOENT; |
652 | if (xfrm_policy_id2dir(id) != dir) | |
653 | return NULL; | |
654 | ||
ef41aaa0 | 655 | *err = 0; |
1da177e4 | 656 | write_lock_bh(&xfrm_policy_lock); |
8d1211a6 | 657 | chain = net->xfrm.policy_byidx + idx_hash(net, id); |
2518c7c2 DM |
658 | ret = NULL; |
659 | hlist_for_each_entry(pol, entry, chain, byidx) { | |
34f8d884 JHS |
660 | if (pol->type == type && pol->index == id && |
661 | (mark & pol->mark.m) == pol->mark.v) { | |
1da177e4 | 662 | xfrm_pol_hold(pol); |
2518c7c2 | 663 | if (delete) { |
03e1ad7b PM |
664 | *err = security_xfrm_policy_delete( |
665 | pol->security); | |
ef41aaa0 EP |
666 | if (*err) { |
667 | write_unlock_bh(&xfrm_policy_lock); | |
668 | return pol; | |
669 | } | |
29fa0b30 | 670 | __xfrm_policy_unlink(pol, dir); |
2518c7c2 DM |
671 | } |
672 | ret = pol; | |
1da177e4 LT |
673 | break; |
674 | } | |
675 | } | |
676 | write_unlock_bh(&xfrm_policy_lock); | |
677 | ||
fe1a5f03 | 678 | if (ret && delete) |
2518c7c2 | 679 | xfrm_policy_kill(ret); |
2518c7c2 | 680 | return ret; |
1da177e4 LT |
681 | } |
682 | EXPORT_SYMBOL(xfrm_policy_byid); | |
683 | ||
4aa2e62c JL |
684 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
685 | static inline int | |
33ffbbd5 | 686 | xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info) |
1da177e4 | 687 | { |
4aa2e62c JL |
688 | int dir, err = 0; |
689 | ||
690 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { | |
691 | struct xfrm_policy *pol; | |
692 | struct hlist_node *entry; | |
693 | int i; | |
694 | ||
695 | hlist_for_each_entry(pol, entry, | |
33ffbbd5 | 696 | &net->xfrm.policy_inexact[dir], bydst) { |
4aa2e62c JL |
697 | if (pol->type != type) |
698 | continue; | |
03e1ad7b | 699 | err = security_xfrm_policy_delete(pol->security); |
4aa2e62c | 700 | if (err) { |
ab5f5e8b JL |
701 | xfrm_audit_policy_delete(pol, 0, |
702 | audit_info->loginuid, | |
2532386f | 703 | audit_info->sessionid, |
ab5f5e8b | 704 | audit_info->secid); |
4aa2e62c JL |
705 | return err; |
706 | } | |
7dc12d6d | 707 | } |
33ffbbd5 | 708 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { |
4aa2e62c | 709 | hlist_for_each_entry(pol, entry, |
33ffbbd5 | 710 | net->xfrm.policy_bydst[dir].table + i, |
4aa2e62c JL |
711 | bydst) { |
712 | if (pol->type != type) | |
713 | continue; | |
03e1ad7b PM |
714 | err = security_xfrm_policy_delete( |
715 | pol->security); | |
4aa2e62c | 716 | if (err) { |
ab5f5e8b JL |
717 | xfrm_audit_policy_delete(pol, 0, |
718 | audit_info->loginuid, | |
2532386f | 719 | audit_info->sessionid, |
ab5f5e8b | 720 | audit_info->secid); |
4aa2e62c JL |
721 | return err; |
722 | } | |
723 | } | |
724 | } | |
725 | } | |
726 | return err; | |
727 | } | |
728 | #else | |
729 | static inline int | |
33ffbbd5 | 730 | xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info) |
4aa2e62c JL |
731 | { |
732 | return 0; | |
733 | } | |
734 | #endif | |
735 | ||
33ffbbd5 | 736 | int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info) |
4aa2e62c | 737 | { |
2f1eb65f | 738 | int dir, err = 0, cnt = 0; |
1da177e4 LT |
739 | |
740 | write_lock_bh(&xfrm_policy_lock); | |
4aa2e62c | 741 | |
33ffbbd5 | 742 | err = xfrm_policy_flush_secctx_check(net, type, audit_info); |
4aa2e62c JL |
743 | if (err) |
744 | goto out; | |
745 | ||
1da177e4 | 746 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
2518c7c2 DM |
747 | struct xfrm_policy *pol; |
748 | struct hlist_node *entry; | |
29fa0b30 | 749 | int i; |
2518c7c2 DM |
750 | |
751 | again1: | |
752 | hlist_for_each_entry(pol, entry, | |
33ffbbd5 | 753 | &net->xfrm.policy_inexact[dir], bydst) { |
2518c7c2 DM |
754 | if (pol->type != type) |
755 | continue; | |
ea2dea9d | 756 | __xfrm_policy_unlink(pol, dir); |
1da177e4 | 757 | write_unlock_bh(&xfrm_policy_lock); |
ea2dea9d | 758 | cnt++; |
1da177e4 | 759 | |
ab5f5e8b | 760 | xfrm_audit_policy_delete(pol, 1, audit_info->loginuid, |
2532386f | 761 | audit_info->sessionid, |
ab5f5e8b | 762 | audit_info->secid); |
161a09e7 | 763 | |
2518c7c2 | 764 | xfrm_policy_kill(pol); |
1da177e4 LT |
765 | |
766 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
767 | goto again1; |
768 | } | |
769 | ||
33ffbbd5 | 770 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { |
2518c7c2 DM |
771 | again2: |
772 | hlist_for_each_entry(pol, entry, | |
33ffbbd5 | 773 | net->xfrm.policy_bydst[dir].table + i, |
2518c7c2 DM |
774 | bydst) { |
775 | if (pol->type != type) | |
776 | continue; | |
ea2dea9d | 777 | __xfrm_policy_unlink(pol, dir); |
2518c7c2 | 778 | write_unlock_bh(&xfrm_policy_lock); |
ea2dea9d | 779 | cnt++; |
2518c7c2 | 780 | |
ab5f5e8b JL |
781 | xfrm_audit_policy_delete(pol, 1, |
782 | audit_info->loginuid, | |
2532386f | 783 | audit_info->sessionid, |
ab5f5e8b | 784 | audit_info->secid); |
2518c7c2 DM |
785 | xfrm_policy_kill(pol); |
786 | ||
787 | write_lock_bh(&xfrm_policy_lock); | |
788 | goto again2; | |
789 | } | |
1da177e4 | 790 | } |
2518c7c2 | 791 | |
1da177e4 | 792 | } |
2f1eb65f JHS |
793 | if (!cnt) |
794 | err = -ESRCH; | |
4aa2e62c | 795 | out: |
1da177e4 | 796 | write_unlock_bh(&xfrm_policy_lock); |
4aa2e62c | 797 | return err; |
1da177e4 LT |
798 | } |
799 | EXPORT_SYMBOL(xfrm_policy_flush); | |
800 | ||
cdcbca7c | 801 | int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, |
4c563f76 | 802 | int (*func)(struct xfrm_policy *, int, int, void*), |
1da177e4 LT |
803 | void *data) |
804 | { | |
12a169e7 HX |
805 | struct xfrm_policy *pol; |
806 | struct xfrm_policy_walk_entry *x; | |
4c563f76 TT |
807 | int error = 0; |
808 | ||
809 | if (walk->type >= XFRM_POLICY_TYPE_MAX && | |
810 | walk->type != XFRM_POLICY_TYPE_ANY) | |
811 | return -EINVAL; | |
1da177e4 | 812 | |
12a169e7 | 813 | if (list_empty(&walk->walk.all) && walk->seq != 0) |
4c563f76 TT |
814 | return 0; |
815 | ||
12a169e7 HX |
816 | write_lock_bh(&xfrm_policy_lock); |
817 | if (list_empty(&walk->walk.all)) | |
cdcbca7c | 818 | x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all); |
12a169e7 HX |
819 | else |
820 | x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all); | |
cdcbca7c | 821 | list_for_each_entry_from(x, &net->xfrm.policy_all, all) { |
12a169e7 | 822 | if (x->dead) |
4c563f76 | 823 | continue; |
12a169e7 HX |
824 | pol = container_of(x, struct xfrm_policy, walk); |
825 | if (walk->type != XFRM_POLICY_TYPE_ANY && | |
826 | walk->type != pol->type) | |
827 | continue; | |
828 | error = func(pol, xfrm_policy_id2dir(pol->index), | |
829 | walk->seq, data); | |
830 | if (error) { | |
831 | list_move_tail(&walk->walk.all, &x->all); | |
832 | goto out; | |
2518c7c2 | 833 | } |
12a169e7 | 834 | walk->seq++; |
1da177e4 | 835 | } |
12a169e7 | 836 | if (walk->seq == 0) { |
baf5d743 JHS |
837 | error = -ENOENT; |
838 | goto out; | |
839 | } | |
12a169e7 | 840 | list_del_init(&walk->walk.all); |
1da177e4 | 841 | out: |
12a169e7 | 842 | write_unlock_bh(&xfrm_policy_lock); |
1da177e4 LT |
843 | return error; |
844 | } | |
845 | EXPORT_SYMBOL(xfrm_policy_walk); | |
846 | ||
12a169e7 HX |
847 | void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type) |
848 | { | |
849 | INIT_LIST_HEAD(&walk->walk.all); | |
850 | walk->walk.dead = 1; | |
851 | walk->type = type; | |
852 | walk->seq = 0; | |
853 | } | |
854 | EXPORT_SYMBOL(xfrm_policy_walk_init); | |
855 | ||
856 | void xfrm_policy_walk_done(struct xfrm_policy_walk *walk) | |
857 | { | |
858 | if (list_empty(&walk->walk.all)) | |
859 | return; | |
860 | ||
861 | write_lock_bh(&xfrm_policy_lock); | |
862 | list_del(&walk->walk.all); | |
863 | write_unlock_bh(&xfrm_policy_lock); | |
864 | } | |
865 | EXPORT_SYMBOL(xfrm_policy_walk_done); | |
866 | ||
134b0fc5 JM |
867 | /* |
868 | * Find policy to apply to this flow. | |
869 | * | |
870 | * Returns 0 if policy found, else an -errno. | |
871 | */ | |
f299d557 DM |
872 | static int xfrm_policy_match(const struct xfrm_policy *pol, |
873 | const struct flowi *fl, | |
2518c7c2 | 874 | u8 type, u16 family, int dir) |
1da177e4 | 875 | { |
f299d557 | 876 | const struct xfrm_selector *sel = &pol->selector; |
134b0fc5 | 877 | int match, ret = -ESRCH; |
1da177e4 | 878 | |
2518c7c2 | 879 | if (pol->family != family || |
34f8d884 | 880 | (fl->mark & pol->mark.m) != pol->mark.v || |
2518c7c2 | 881 | pol->type != type) |
134b0fc5 | 882 | return ret; |
1da177e4 | 883 | |
2518c7c2 | 884 | match = xfrm_selector_match(sel, fl, family); |
134b0fc5 | 885 | if (match) |
03e1ad7b PM |
886 | ret = security_xfrm_policy_lookup(pol->security, fl->secid, |
887 | dir); | |
2518c7c2 | 888 | |
134b0fc5 | 889 | return ret; |
2518c7c2 | 890 | } |
1da177e4 | 891 | |
52479b62 | 892 | static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type, |
062cdb43 | 893 | const struct flowi *fl, |
2518c7c2 DM |
894 | u16 family, u8 dir) |
895 | { | |
134b0fc5 | 896 | int err; |
2518c7c2 | 897 | struct xfrm_policy *pol, *ret; |
0b597e7e | 898 | const xfrm_address_t *daddr, *saddr; |
2518c7c2 DM |
899 | struct hlist_node *entry; |
900 | struct hlist_head *chain; | |
acba48e1 | 901 | u32 priority = ~0U; |
df71837d | 902 | |
2518c7c2 DM |
903 | daddr = xfrm_flowi_daddr(fl, family); |
904 | saddr = xfrm_flowi_saddr(fl, family); | |
905 | if (unlikely(!daddr || !saddr)) | |
906 | return NULL; | |
907 | ||
908 | read_lock_bh(&xfrm_policy_lock); | |
52479b62 | 909 | chain = policy_hash_direct(net, daddr, saddr, family, dir); |
2518c7c2 DM |
910 | ret = NULL; |
911 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
912 | err = xfrm_policy_match(pol, fl, type, family, dir); |
913 | if (err) { | |
914 | if (err == -ESRCH) | |
915 | continue; | |
916 | else { | |
917 | ret = ERR_PTR(err); | |
918 | goto fail; | |
919 | } | |
920 | } else { | |
2518c7c2 | 921 | ret = pol; |
acba48e1 | 922 | priority = ret->priority; |
2518c7c2 DM |
923 | break; |
924 | } | |
925 | } | |
52479b62 | 926 | chain = &net->xfrm.policy_inexact[dir]; |
acba48e1 | 927 | hlist_for_each_entry(pol, entry, chain, bydst) { |
134b0fc5 JM |
928 | err = xfrm_policy_match(pol, fl, type, family, dir); |
929 | if (err) { | |
930 | if (err == -ESRCH) | |
931 | continue; | |
932 | else { | |
933 | ret = ERR_PTR(err); | |
934 | goto fail; | |
935 | } | |
936 | } else if (pol->priority < priority) { | |
acba48e1 DM |
937 | ret = pol; |
938 | break; | |
1da177e4 LT |
939 | } |
940 | } | |
acba48e1 DM |
941 | if (ret) |
942 | xfrm_pol_hold(ret); | |
134b0fc5 | 943 | fail: |
1da177e4 | 944 | read_unlock_bh(&xfrm_policy_lock); |
4e81bb83 | 945 | |
2518c7c2 | 946 | return ret; |
4e81bb83 MN |
947 | } |
948 | ||
80c802f3 | 949 | static struct xfrm_policy * |
73ff93cd | 950 | __xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir) |
80c802f3 TT |
951 | { |
952 | #ifdef CONFIG_XFRM_SUB_POLICY | |
953 | struct xfrm_policy *pol; | |
954 | ||
955 | pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir); | |
956 | if (pol != NULL) | |
957 | return pol; | |
958 | #endif | |
959 | return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir); | |
960 | } | |
961 | ||
fe1a5f03 | 962 | static struct flow_cache_object * |
dee9f4bc | 963 | xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, |
fe1a5f03 | 964 | u8 dir, struct flow_cache_object *old_obj, void *ctx) |
4e81bb83 MN |
965 | { |
966 | struct xfrm_policy *pol; | |
fe1a5f03 TT |
967 | |
968 | if (old_obj) | |
969 | xfrm_pol_put(container_of(old_obj, struct xfrm_policy, flo)); | |
4e81bb83 | 970 | |
80c802f3 TT |
971 | pol = __xfrm_policy_lookup(net, fl, family, dir); |
972 | if (IS_ERR_OR_NULL(pol)) | |
fe1a5f03 | 973 | return ERR_CAST(pol); |
fe1a5f03 | 974 | |
fe1a5f03 TT |
975 | /* Resolver returns two references: |
976 | * one for cache and one for caller of flow_cache_lookup() */ | |
977 | xfrm_pol_hold(pol); | |
978 | ||
979 | return &pol->flo; | |
1da177e4 LT |
980 | } |
981 | ||
df71837d TJ |
982 | static inline int policy_to_flow_dir(int dir) |
983 | { | |
984 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
a716c119 YH |
985 | XFRM_POLICY_OUT == FLOW_DIR_OUT && |
986 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
987 | return dir; | |
988 | switch (dir) { | |
989 | default: | |
990 | case XFRM_POLICY_IN: | |
991 | return FLOW_DIR_IN; | |
992 | case XFRM_POLICY_OUT: | |
993 | return FLOW_DIR_OUT; | |
994 | case XFRM_POLICY_FWD: | |
995 | return FLOW_DIR_FWD; | |
3ff50b79 | 996 | } |
df71837d TJ |
997 | } |
998 | ||
dee9f4bc DM |
999 | static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, |
1000 | const struct flowi *fl) | |
1da177e4 LT |
1001 | { |
1002 | struct xfrm_policy *pol; | |
1003 | ||
1004 | read_lock_bh(&xfrm_policy_lock); | |
1005 | if ((pol = sk->sk_policy[dir]) != NULL) { | |
a716c119 | 1006 | int match = xfrm_selector_match(&pol->selector, fl, |
1da177e4 | 1007 | sk->sk_family); |
a716c119 | 1008 | int err = 0; |
df71837d | 1009 | |
3bccfbc7 | 1010 | if (match) { |
34f8d884 JHS |
1011 | if ((sk->sk_mark & pol->mark.m) != pol->mark.v) { |
1012 | pol = NULL; | |
1013 | goto out; | |
1014 | } | |
03e1ad7b PM |
1015 | err = security_xfrm_policy_lookup(pol->security, |
1016 | fl->secid, | |
1017 | policy_to_flow_dir(dir)); | |
3bccfbc7 VY |
1018 | if (!err) |
1019 | xfrm_pol_hold(pol); | |
1020 | else if (err == -ESRCH) | |
1021 | pol = NULL; | |
1022 | else | |
1023 | pol = ERR_PTR(err); | |
1024 | } else | |
1da177e4 LT |
1025 | pol = NULL; |
1026 | } | |
34f8d884 | 1027 | out: |
1da177e4 LT |
1028 | read_unlock_bh(&xfrm_policy_lock); |
1029 | return pol; | |
1030 | } | |
1031 | ||
1032 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) | |
1033 | { | |
98806f75 | 1034 | struct net *net = xp_net(pol); |
1121994c | 1035 | struct hlist_head *chain = policy_hash_bysel(net, &pol->selector, |
2518c7c2 | 1036 | pol->family, dir); |
4e81bb83 | 1037 | |
98806f75 | 1038 | list_add(&pol->walk.all, &net->xfrm.policy_all); |
2518c7c2 | 1039 | hlist_add_head(&pol->bydst, chain); |
e92303f8 | 1040 | hlist_add_head(&pol->byidx, net->xfrm.policy_byidx+idx_hash(net, pol->index)); |
98806f75 | 1041 | net->xfrm.policy_count[dir]++; |
1da177e4 | 1042 | xfrm_pol_hold(pol); |
2518c7c2 | 1043 | |
98806f75 AD |
1044 | if (xfrm_bydst_should_resize(net, dir, NULL)) |
1045 | schedule_work(&net->xfrm.policy_hash_work); | |
1da177e4 LT |
1046 | } |
1047 | ||
1048 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, | |
1049 | int dir) | |
1050 | { | |
98806f75 AD |
1051 | struct net *net = xp_net(pol); |
1052 | ||
2518c7c2 DM |
1053 | if (hlist_unhashed(&pol->bydst)) |
1054 | return NULL; | |
1da177e4 | 1055 | |
2518c7c2 DM |
1056 | hlist_del(&pol->bydst); |
1057 | hlist_del(&pol->byidx); | |
12a169e7 | 1058 | list_del(&pol->walk.all); |
98806f75 | 1059 | net->xfrm.policy_count[dir]--; |
2518c7c2 DM |
1060 | |
1061 | return pol; | |
1da177e4 LT |
1062 | } |
1063 | ||
4666faab | 1064 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir) |
1da177e4 LT |
1065 | { |
1066 | write_lock_bh(&xfrm_policy_lock); | |
1067 | pol = __xfrm_policy_unlink(pol, dir); | |
1068 | write_unlock_bh(&xfrm_policy_lock); | |
1069 | if (pol) { | |
1da177e4 | 1070 | xfrm_policy_kill(pol); |
4666faab | 1071 | return 0; |
1da177e4 | 1072 | } |
4666faab | 1073 | return -ENOENT; |
1da177e4 | 1074 | } |
a70fcb0b | 1075 | EXPORT_SYMBOL(xfrm_policy_delete); |
1da177e4 LT |
1076 | |
1077 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) | |
1078 | { | |
1121994c | 1079 | struct net *net = xp_net(pol); |
1da177e4 LT |
1080 | struct xfrm_policy *old_pol; |
1081 | ||
4e81bb83 MN |
1082 | #ifdef CONFIG_XFRM_SUB_POLICY |
1083 | if (pol && pol->type != XFRM_POLICY_TYPE_MAIN) | |
1084 | return -EINVAL; | |
1085 | #endif | |
1086 | ||
1da177e4 LT |
1087 | write_lock_bh(&xfrm_policy_lock); |
1088 | old_pol = sk->sk_policy[dir]; | |
1089 | sk->sk_policy[dir] = pol; | |
1090 | if (pol) { | |
9d729f72 | 1091 | pol->curlft.add_time = get_seconds(); |
1121994c | 1092 | pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir); |
1da177e4 LT |
1093 | __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir); |
1094 | } | |
1095 | if (old_pol) | |
ea2dea9d TT |
1096 | /* Unlinking succeeds always. This is the only function |
1097 | * allowed to delete or replace socket policy. | |
1098 | */ | |
1da177e4 LT |
1099 | __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir); |
1100 | write_unlock_bh(&xfrm_policy_lock); | |
1101 | ||
1102 | if (old_pol) { | |
1103 | xfrm_policy_kill(old_pol); | |
1104 | } | |
1105 | return 0; | |
1106 | } | |
1107 | ||
d3e40a9f | 1108 | static struct xfrm_policy *clone_policy(const struct xfrm_policy *old, int dir) |
1da177e4 | 1109 | { |
0331b1f3 | 1110 | struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC); |
1da177e4 LT |
1111 | |
1112 | if (newp) { | |
1113 | newp->selector = old->selector; | |
03e1ad7b PM |
1114 | if (security_xfrm_policy_clone(old->security, |
1115 | &newp->security)) { | |
df71837d TJ |
1116 | kfree(newp); |
1117 | return NULL; /* ENOMEM */ | |
1118 | } | |
1da177e4 LT |
1119 | newp->lft = old->lft; |
1120 | newp->curlft = old->curlft; | |
fb977e2c | 1121 | newp->mark = old->mark; |
1da177e4 LT |
1122 | newp->action = old->action; |
1123 | newp->flags = old->flags; | |
1124 | newp->xfrm_nr = old->xfrm_nr; | |
1125 | newp->index = old->index; | |
4e81bb83 | 1126 | newp->type = old->type; |
1da177e4 LT |
1127 | memcpy(newp->xfrm_vec, old->xfrm_vec, |
1128 | newp->xfrm_nr*sizeof(struct xfrm_tmpl)); | |
1129 | write_lock_bh(&xfrm_policy_lock); | |
1130 | __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir); | |
1131 | write_unlock_bh(&xfrm_policy_lock); | |
1132 | xfrm_pol_put(newp); | |
1133 | } | |
1134 | return newp; | |
1135 | } | |
1136 | ||
1137 | int __xfrm_sk_clone_policy(struct sock *sk) | |
1138 | { | |
1139 | struct xfrm_policy *p0 = sk->sk_policy[0], | |
1140 | *p1 = sk->sk_policy[1]; | |
1141 | ||
1142 | sk->sk_policy[0] = sk->sk_policy[1] = NULL; | |
1143 | if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL) | |
1144 | return -ENOMEM; | |
1145 | if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL) | |
1146 | return -ENOMEM; | |
1147 | return 0; | |
1148 | } | |
1149 | ||
a1e59abf | 1150 | static int |
fbda33b2 | 1151 | xfrm_get_saddr(struct net *net, xfrm_address_t *local, xfrm_address_t *remote, |
a1e59abf PM |
1152 | unsigned short family) |
1153 | { | |
1154 | int err; | |
1155 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1156 | ||
1157 | if (unlikely(afinfo == NULL)) | |
1158 | return -EINVAL; | |
fbda33b2 | 1159 | err = afinfo->get_saddr(net, local, remote); |
a1e59abf PM |
1160 | xfrm_policy_put_afinfo(afinfo); |
1161 | return err; | |
1162 | } | |
1163 | ||
1da177e4 LT |
1164 | /* Resolve list of templates for the flow, given policy. */ |
1165 | ||
1166 | static int | |
a6c2e611 DM |
1167 | xfrm_tmpl_resolve_one(struct xfrm_policy *policy, const struct flowi *fl, |
1168 | struct xfrm_state **xfrm, unsigned short family) | |
1da177e4 | 1169 | { |
fbda33b2 | 1170 | struct net *net = xp_net(policy); |
1da177e4 LT |
1171 | int nx; |
1172 | int i, error; | |
1173 | xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); | |
1174 | xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); | |
a1e59abf | 1175 | xfrm_address_t tmp; |
1da177e4 LT |
1176 | |
1177 | for (nx=0, i = 0; i < policy->xfrm_nr; i++) { | |
1178 | struct xfrm_state *x; | |
1179 | xfrm_address_t *remote = daddr; | |
1180 | xfrm_address_t *local = saddr; | |
1181 | struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; | |
1182 | ||
48b8d783 JK |
1183 | if (tmpl->mode == XFRM_MODE_TUNNEL || |
1184 | tmpl->mode == XFRM_MODE_BEET) { | |
1da177e4 LT |
1185 | remote = &tmpl->id.daddr; |
1186 | local = &tmpl->saddr; | |
8444cf71 TE |
1187 | if (xfrm_addr_any(local, tmpl->encap_family)) { |
1188 | error = xfrm_get_saddr(net, &tmp, remote, tmpl->encap_family); | |
a1e59abf PM |
1189 | if (error) |
1190 | goto fail; | |
1191 | local = &tmp; | |
1192 | } | |
1da177e4 LT |
1193 | } |
1194 | ||
1195 | x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); | |
1196 | ||
1197 | if (x && x->km.state == XFRM_STATE_VALID) { | |
1198 | xfrm[nx++] = x; | |
1199 | daddr = remote; | |
1200 | saddr = local; | |
1201 | continue; | |
1202 | } | |
1203 | if (x) { | |
1204 | error = (x->km.state == XFRM_STATE_ERROR ? | |
1205 | -EINVAL : -EAGAIN); | |
1206 | xfrm_state_put(x); | |
1207 | } | |
a4322266 | 1208 | else if (error == -ESRCH) |
1209 | error = -EAGAIN; | |
1da177e4 LT |
1210 | |
1211 | if (!tmpl->optional) | |
1212 | goto fail; | |
1213 | } | |
1214 | return nx; | |
1215 | ||
1216 | fail: | |
1217 | for (nx--; nx>=0; nx--) | |
1218 | xfrm_state_put(xfrm[nx]); | |
1219 | return error; | |
1220 | } | |
1221 | ||
4e81bb83 | 1222 | static int |
a6c2e611 DM |
1223 | xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, const struct flowi *fl, |
1224 | struct xfrm_state **xfrm, unsigned short family) | |
4e81bb83 | 1225 | { |
41a49cc3 MN |
1226 | struct xfrm_state *tp[XFRM_MAX_DEPTH]; |
1227 | struct xfrm_state **tpp = (npols > 1) ? tp : xfrm; | |
4e81bb83 MN |
1228 | int cnx = 0; |
1229 | int error; | |
1230 | int ret; | |
1231 | int i; | |
1232 | ||
1233 | for (i = 0; i < npols; i++) { | |
1234 | if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
1235 | error = -ENOBUFS; | |
1236 | goto fail; | |
1237 | } | |
41a49cc3 MN |
1238 | |
1239 | ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family); | |
4e81bb83 MN |
1240 | if (ret < 0) { |
1241 | error = ret; | |
1242 | goto fail; | |
1243 | } else | |
1244 | cnx += ret; | |
1245 | } | |
1246 | ||
41a49cc3 MN |
1247 | /* found states are sorted for outbound processing */ |
1248 | if (npols > 1) | |
1249 | xfrm_state_sort(xfrm, tpp, cnx, family); | |
1250 | ||
4e81bb83 MN |
1251 | return cnx; |
1252 | ||
1253 | fail: | |
1254 | for (cnx--; cnx>=0; cnx--) | |
41a49cc3 | 1255 | xfrm_state_put(tpp[cnx]); |
4e81bb83 MN |
1256 | return error; |
1257 | ||
1258 | } | |
1259 | ||
1da177e4 LT |
1260 | /* Check that the bundle accepts the flow and its components are |
1261 | * still valid. | |
1262 | */ | |
1263 | ||
05d84025 | 1264 | static inline int xfrm_get_tos(const struct flowi *fl, int family) |
25ee3286 HX |
1265 | { |
1266 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1267 | int tos; | |
1da177e4 | 1268 | |
25ee3286 HX |
1269 | if (!afinfo) |
1270 | return -EINVAL; | |
1271 | ||
1272 | tos = afinfo->get_tos(fl); | |
1273 | ||
1274 | xfrm_policy_put_afinfo(afinfo); | |
1275 | ||
1276 | return tos; | |
1277 | } | |
1278 | ||
80c802f3 TT |
1279 | static struct flow_cache_object *xfrm_bundle_flo_get(struct flow_cache_object *flo) |
1280 | { | |
1281 | struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); | |
1282 | struct dst_entry *dst = &xdst->u.dst; | |
1283 | ||
1284 | if (xdst->route == NULL) { | |
1285 | /* Dummy bundle - if it has xfrms we were not | |
1286 | * able to build bundle as template resolution failed. | |
1287 | * It means we need to try again resolving. */ | |
1288 | if (xdst->num_xfrms > 0) | |
1289 | return NULL; | |
1290 | } else { | |
1291 | /* Real bundle */ | |
1292 | if (stale_bundle(dst)) | |
1293 | return NULL; | |
1294 | } | |
1295 | ||
1296 | dst_hold(dst); | |
1297 | return flo; | |
1298 | } | |
1299 | ||
1300 | static int xfrm_bundle_flo_check(struct flow_cache_object *flo) | |
1301 | { | |
1302 | struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); | |
1303 | struct dst_entry *dst = &xdst->u.dst; | |
1304 | ||
1305 | if (!xdst->route) | |
1306 | return 0; | |
1307 | if (stale_bundle(dst)) | |
1308 | return 0; | |
1309 | ||
1310 | return 1; | |
1311 | } | |
1312 | ||
1313 | static void xfrm_bundle_flo_delete(struct flow_cache_object *flo) | |
1314 | { | |
1315 | struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); | |
1316 | struct dst_entry *dst = &xdst->u.dst; | |
1317 | ||
1318 | dst_free(dst); | |
1319 | } | |
1320 | ||
1321 | static const struct flow_cache_ops xfrm_bundle_fc_ops = { | |
1322 | .get = xfrm_bundle_flo_get, | |
1323 | .check = xfrm_bundle_flo_check, | |
1324 | .delete = xfrm_bundle_flo_delete, | |
1325 | }; | |
1326 | ||
d7c7544c | 1327 | static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family) |
1da177e4 | 1328 | { |
1da177e4 | 1329 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
d7c7544c | 1330 | struct dst_ops *dst_ops; |
25ee3286 HX |
1331 | struct xfrm_dst *xdst; |
1332 | ||
1333 | if (!afinfo) | |
1334 | return ERR_PTR(-EINVAL); | |
1335 | ||
d7c7544c AD |
1336 | switch (family) { |
1337 | case AF_INET: | |
1338 | dst_ops = &net->xfrm.xfrm4_dst_ops; | |
1339 | break; | |
1340 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
1341 | case AF_INET6: | |
1342 | dst_ops = &net->xfrm.xfrm6_dst_ops; | |
1343 | break; | |
1344 | #endif | |
1345 | default: | |
1346 | BUG(); | |
1347 | } | |
da935c66 | 1348 | xdst = dst_alloc(dst_ops, 0); |
25ee3286 HX |
1349 | xfrm_policy_put_afinfo(afinfo); |
1350 | ||
0b150932 HS |
1351 | if (likely(xdst)) |
1352 | xdst->flo.ops = &xfrm_bundle_fc_ops; | |
1353 | else | |
1354 | xdst = ERR_PTR(-ENOBUFS); | |
80c802f3 | 1355 | |
25ee3286 HX |
1356 | return xdst; |
1357 | } | |
1358 | ||
a1b05140 MN |
1359 | static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst, |
1360 | int nfheader_len) | |
1361 | { | |
1362 | struct xfrm_policy_afinfo *afinfo = | |
1363 | xfrm_policy_get_afinfo(dst->ops->family); | |
1364 | int err; | |
1365 | ||
1366 | if (!afinfo) | |
1367 | return -EINVAL; | |
1368 | ||
1369 | err = afinfo->init_path(path, dst, nfheader_len); | |
1370 | ||
1371 | xfrm_policy_put_afinfo(afinfo); | |
1372 | ||
1373 | return err; | |
1374 | } | |
1375 | ||
87c1e12b | 1376 | static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev, |
0c7b3eef | 1377 | const struct flowi *fl) |
25ee3286 HX |
1378 | { |
1379 | struct xfrm_policy_afinfo *afinfo = | |
1380 | xfrm_policy_get_afinfo(xdst->u.dst.ops->family); | |
1381 | int err; | |
1382 | ||
1383 | if (!afinfo) | |
1da177e4 | 1384 | return -EINVAL; |
25ee3286 | 1385 | |
87c1e12b | 1386 | err = afinfo->fill_dst(xdst, dev, fl); |
25ee3286 | 1387 | |
1da177e4 | 1388 | xfrm_policy_put_afinfo(afinfo); |
25ee3286 | 1389 | |
1da177e4 LT |
1390 | return err; |
1391 | } | |
1392 | ||
80c802f3 | 1393 | |
25ee3286 HX |
1394 | /* Allocate chain of dst_entry's, attach known xfrm's, calculate |
1395 | * all the metrics... Shortly, bundle a bundle. | |
1396 | */ | |
1397 | ||
1398 | static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy, | |
1399 | struct xfrm_state **xfrm, int nx, | |
98313ada | 1400 | const struct flowi *fl, |
25ee3286 HX |
1401 | struct dst_entry *dst) |
1402 | { | |
d7c7544c | 1403 | struct net *net = xp_net(policy); |
25ee3286 HX |
1404 | unsigned long now = jiffies; |
1405 | struct net_device *dev; | |
1406 | struct dst_entry *dst_prev = NULL; | |
1407 | struct dst_entry *dst0 = NULL; | |
1408 | int i = 0; | |
1409 | int err; | |
1410 | int header_len = 0; | |
a1b05140 | 1411 | int nfheader_len = 0; |
25ee3286 HX |
1412 | int trailer_len = 0; |
1413 | int tos; | |
1414 | int family = policy->selector.family; | |
9bb182a7 YH |
1415 | xfrm_address_t saddr, daddr; |
1416 | ||
1417 | xfrm_flowi_addr_get(fl, &saddr, &daddr, family); | |
25ee3286 HX |
1418 | |
1419 | tos = xfrm_get_tos(fl, family); | |
1420 | err = tos; | |
1421 | if (tos < 0) | |
1422 | goto put_states; | |
1423 | ||
1424 | dst_hold(dst); | |
1425 | ||
1426 | for (; i < nx; i++) { | |
d7c7544c | 1427 | struct xfrm_dst *xdst = xfrm_alloc_dst(net, family); |
25ee3286 HX |
1428 | struct dst_entry *dst1 = &xdst->u.dst; |
1429 | ||
1430 | err = PTR_ERR(xdst); | |
1431 | if (IS_ERR(xdst)) { | |
1432 | dst_release(dst); | |
1433 | goto put_states; | |
1434 | } | |
1435 | ||
1436 | if (!dst_prev) | |
1437 | dst0 = dst1; | |
1438 | else { | |
1439 | dst_prev->child = dst_clone(dst1); | |
1440 | dst1->flags |= DST_NOHASH; | |
1441 | } | |
1442 | ||
1443 | xdst->route = dst; | |
defb3519 | 1444 | dst_copy_metrics(dst1, dst); |
25ee3286 HX |
1445 | |
1446 | if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) { | |
1447 | family = xfrm[i]->props.family; | |
9bb182a7 YH |
1448 | dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr, |
1449 | family); | |
25ee3286 HX |
1450 | err = PTR_ERR(dst); |
1451 | if (IS_ERR(dst)) | |
1452 | goto put_states; | |
1453 | } else | |
1454 | dst_hold(dst); | |
1455 | ||
1456 | dst1->xfrm = xfrm[i]; | |
80c802f3 | 1457 | xdst->xfrm_genid = xfrm[i]->genid; |
25ee3286 HX |
1458 | |
1459 | dst1->obsolete = -1; | |
1460 | dst1->flags |= DST_HOST; | |
1461 | dst1->lastuse = now; | |
1462 | ||
1463 | dst1->input = dst_discard; | |
1464 | dst1->output = xfrm[i]->outer_mode->afinfo->output; | |
1465 | ||
1466 | dst1->next = dst_prev; | |
1467 | dst_prev = dst1; | |
1468 | ||
1469 | header_len += xfrm[i]->props.header_len; | |
a1b05140 MN |
1470 | if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT) |
1471 | nfheader_len += xfrm[i]->props.header_len; | |
25ee3286 HX |
1472 | trailer_len += xfrm[i]->props.trailer_len; |
1473 | } | |
1474 | ||
1475 | dst_prev->child = dst; | |
1476 | dst0->path = dst; | |
1477 | ||
1478 | err = -ENODEV; | |
1479 | dev = dst->dev; | |
1480 | if (!dev) | |
1481 | goto free_dst; | |
1482 | ||
96c53401 | 1483 | /* Copy neighbour for reachability confirmation */ |
25ee3286 HX |
1484 | dst0->neighbour = neigh_clone(dst->neighbour); |
1485 | ||
a1b05140 | 1486 | xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len); |
25ee3286 HX |
1487 | xfrm_init_pmtu(dst_prev); |
1488 | ||
1489 | for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) { | |
1490 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev; | |
1491 | ||
87c1e12b | 1492 | err = xfrm_fill_dst(xdst, dev, fl); |
25ee3286 HX |
1493 | if (err) |
1494 | goto free_dst; | |
1495 | ||
1496 | dst_prev->header_len = header_len; | |
1497 | dst_prev->trailer_len = trailer_len; | |
1498 | header_len -= xdst->u.dst.xfrm->props.header_len; | |
1499 | trailer_len -= xdst->u.dst.xfrm->props.trailer_len; | |
1500 | } | |
1501 | ||
1502 | out: | |
1503 | return dst0; | |
1504 | ||
1505 | put_states: | |
1506 | for (; i < nx; i++) | |
1507 | xfrm_state_put(xfrm[i]); | |
1508 | free_dst: | |
1509 | if (dst0) | |
1510 | dst_free(dst0); | |
1511 | dst0 = ERR_PTR(err); | |
1512 | goto out; | |
1513 | } | |
1514 | ||
157bfc25 | 1515 | static int inline |
3f0e18fb | 1516 | xfrm_dst_alloc_copy(void **target, const void *src, int size) |
157bfc25 MN |
1517 | { |
1518 | if (!*target) { | |
1519 | *target = kmalloc(size, GFP_ATOMIC); | |
1520 | if (!*target) | |
1521 | return -ENOMEM; | |
1522 | } | |
1523 | memcpy(*target, src, size); | |
1524 | return 0; | |
1525 | } | |
1526 | ||
1527 | static int inline | |
1786b389 | 1528 | xfrm_dst_update_parent(struct dst_entry *dst, const struct xfrm_selector *sel) |
157bfc25 MN |
1529 | { |
1530 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1531 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1532 | return xfrm_dst_alloc_copy((void **)&(xdst->partner), | |
1533 | sel, sizeof(*sel)); | |
1534 | #else | |
1535 | return 0; | |
1536 | #endif | |
1537 | } | |
1538 | ||
1539 | static int inline | |
3f0e18fb | 1540 | xfrm_dst_update_origin(struct dst_entry *dst, const struct flowi *fl) |
157bfc25 MN |
1541 | { |
1542 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1543 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1544 | return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl)); | |
1545 | #else | |
1546 | return 0; | |
1547 | #endif | |
1548 | } | |
1da177e4 | 1549 | |
73ff93cd | 1550 | static int xfrm_expand_policies(const struct flowi *fl, u16 family, |
80c802f3 TT |
1551 | struct xfrm_policy **pols, |
1552 | int *num_pols, int *num_xfrms) | |
1553 | { | |
1554 | int i; | |
1555 | ||
1556 | if (*num_pols == 0 || !pols[0]) { | |
1557 | *num_pols = 0; | |
1558 | *num_xfrms = 0; | |
1559 | return 0; | |
1560 | } | |
1561 | if (IS_ERR(pols[0])) | |
1562 | return PTR_ERR(pols[0]); | |
1563 | ||
1564 | *num_xfrms = pols[0]->xfrm_nr; | |
1565 | ||
1566 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1567 | if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW && | |
1568 | pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1569 | pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]), | |
1570 | XFRM_POLICY_TYPE_MAIN, | |
1571 | fl, family, | |
1572 | XFRM_POLICY_OUT); | |
1573 | if (pols[1]) { | |
1574 | if (IS_ERR(pols[1])) { | |
1575 | xfrm_pols_put(pols, *num_pols); | |
1576 | return PTR_ERR(pols[1]); | |
1577 | } | |
1578 | (*num_pols) ++; | |
1579 | (*num_xfrms) += pols[1]->xfrm_nr; | |
1580 | } | |
1581 | } | |
1582 | #endif | |
1583 | for (i = 0; i < *num_pols; i++) { | |
1584 | if (pols[i]->action != XFRM_POLICY_ALLOW) { | |
1585 | *num_xfrms = -1; | |
1586 | break; | |
1587 | } | |
1588 | } | |
1589 | ||
1590 | return 0; | |
1591 | ||
1592 | } | |
1593 | ||
1594 | static struct xfrm_dst * | |
1595 | xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols, | |
4ca2e685 | 1596 | const struct flowi *fl, u16 family, |
80c802f3 TT |
1597 | struct dst_entry *dst_orig) |
1598 | { | |
1599 | struct net *net = xp_net(pols[0]); | |
1600 | struct xfrm_state *xfrm[XFRM_MAX_DEPTH]; | |
1601 | struct dst_entry *dst; | |
1602 | struct xfrm_dst *xdst; | |
1603 | int err; | |
1604 | ||
1605 | /* Try to instantiate a bundle */ | |
1606 | err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family); | |
d809ec89 TT |
1607 | if (err <= 0) { |
1608 | if (err != 0 && err != -EAGAIN) | |
80c802f3 TT |
1609 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); |
1610 | return ERR_PTR(err); | |
1611 | } | |
1612 | ||
1613 | dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig); | |
1614 | if (IS_ERR(dst)) { | |
1615 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR); | |
1616 | return ERR_CAST(dst); | |
1617 | } | |
1618 | ||
1619 | xdst = (struct xfrm_dst *)dst; | |
1620 | xdst->num_xfrms = err; | |
1621 | if (num_pols > 1) | |
1622 | err = xfrm_dst_update_parent(dst, &pols[1]->selector); | |
1623 | else | |
1624 | err = xfrm_dst_update_origin(dst, fl); | |
1625 | if (unlikely(err)) { | |
1626 | dst_free(dst); | |
1627 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR); | |
1628 | return ERR_PTR(err); | |
1629 | } | |
1630 | ||
1631 | xdst->num_pols = num_pols; | |
1632 | memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols); | |
1633 | xdst->policy_genid = atomic_read(&pols[0]->genid); | |
1634 | ||
1635 | return xdst; | |
1636 | } | |
1637 | ||
1638 | static struct flow_cache_object * | |
dee9f4bc | 1639 | xfrm_bundle_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir, |
80c802f3 TT |
1640 | struct flow_cache_object *oldflo, void *ctx) |
1641 | { | |
1642 | struct dst_entry *dst_orig = (struct dst_entry *)ctx; | |
1643 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; | |
1644 | struct xfrm_dst *xdst, *new_xdst; | |
1645 | int num_pols = 0, num_xfrms = 0, i, err, pol_dead; | |
1646 | ||
1647 | /* Check if the policies from old bundle are usable */ | |
1648 | xdst = NULL; | |
1649 | if (oldflo) { | |
1650 | xdst = container_of(oldflo, struct xfrm_dst, flo); | |
1651 | num_pols = xdst->num_pols; | |
1652 | num_xfrms = xdst->num_xfrms; | |
1653 | pol_dead = 0; | |
1654 | for (i = 0; i < num_pols; i++) { | |
1655 | pols[i] = xdst->pols[i]; | |
1656 | pol_dead |= pols[i]->walk.dead; | |
1657 | } | |
1658 | if (pol_dead) { | |
1659 | dst_free(&xdst->u.dst); | |
1660 | xdst = NULL; | |
1661 | num_pols = 0; | |
1662 | num_xfrms = 0; | |
1663 | oldflo = NULL; | |
1664 | } | |
1665 | } | |
1666 | ||
1667 | /* Resolve policies to use if we couldn't get them from | |
1668 | * previous cache entry */ | |
1669 | if (xdst == NULL) { | |
1670 | num_pols = 1; | |
1671 | pols[0] = __xfrm_policy_lookup(net, fl, family, dir); | |
1672 | err = xfrm_expand_policies(fl, family, pols, | |
1673 | &num_pols, &num_xfrms); | |
1674 | if (err < 0) | |
1675 | goto inc_error; | |
1676 | if (num_pols == 0) | |
1677 | return NULL; | |
1678 | if (num_xfrms <= 0) | |
1679 | goto make_dummy_bundle; | |
1680 | } | |
1681 | ||
1682 | new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family, dst_orig); | |
1683 | if (IS_ERR(new_xdst)) { | |
1684 | err = PTR_ERR(new_xdst); | |
1685 | if (err != -EAGAIN) | |
1686 | goto error; | |
1687 | if (oldflo == NULL) | |
1688 | goto make_dummy_bundle; | |
1689 | dst_hold(&xdst->u.dst); | |
1690 | return oldflo; | |
d809ec89 TT |
1691 | } else if (new_xdst == NULL) { |
1692 | num_xfrms = 0; | |
1693 | if (oldflo == NULL) | |
1694 | goto make_dummy_bundle; | |
1695 | xdst->num_xfrms = 0; | |
1696 | dst_hold(&xdst->u.dst); | |
1697 | return oldflo; | |
80c802f3 TT |
1698 | } |
1699 | ||
1700 | /* Kill the previous bundle */ | |
1701 | if (xdst) { | |
1702 | /* The policies were stolen for newly generated bundle */ | |
1703 | xdst->num_pols = 0; | |
1704 | dst_free(&xdst->u.dst); | |
1705 | } | |
1706 | ||
1707 | /* Flow cache does not have reference, it dst_free()'s, | |
1708 | * but we do need to return one reference for original caller */ | |
1709 | dst_hold(&new_xdst->u.dst); | |
1710 | return &new_xdst->flo; | |
1711 | ||
1712 | make_dummy_bundle: | |
1713 | /* We found policies, but there's no bundles to instantiate: | |
1714 | * either because the policy blocks, has no transformations or | |
1715 | * we could not build template (no xfrm_states).*/ | |
1716 | xdst = xfrm_alloc_dst(net, family); | |
1717 | if (IS_ERR(xdst)) { | |
1718 | xfrm_pols_put(pols, num_pols); | |
1719 | return ERR_CAST(xdst); | |
1720 | } | |
1721 | xdst->num_pols = num_pols; | |
1722 | xdst->num_xfrms = num_xfrms; | |
1723 | memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols); | |
1724 | ||
1725 | dst_hold(&xdst->u.dst); | |
1726 | return &xdst->flo; | |
1727 | ||
1728 | inc_error: | |
1729 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); | |
1730 | error: | |
1731 | if (xdst != NULL) | |
1732 | dst_free(&xdst->u.dst); | |
1733 | else | |
1734 | xfrm_pols_put(pols, num_pols); | |
1735 | return ERR_PTR(err); | |
1736 | } | |
1da177e4 LT |
1737 | |
1738 | /* Main function: finds/creates a bundle for given flow. | |
1739 | * | |
1740 | * At the moment we eat a raw IP route. Mostly to speed up lookups | |
1741 | * on interfaces with disabled IPsec. | |
1742 | */ | |
dee9f4bc DM |
1743 | int __xfrm_lookup(struct net *net, struct dst_entry **dst_p, |
1744 | const struct flowi *fl, | |
14e50e57 | 1745 | struct sock *sk, int flags) |
1da177e4 | 1746 | { |
4e81bb83 | 1747 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
80c802f3 TT |
1748 | struct flow_cache_object *flo; |
1749 | struct xfrm_dst *xdst; | |
1750 | struct dst_entry *dst, *dst_orig = *dst_p, *route; | |
1751 | u16 family = dst_orig->ops->family; | |
df71837d | 1752 | u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT); |
4b021628 | 1753 | int i, err, num_pols, num_xfrms = 0, drop_pols = 0; |
e0d1caa7 | 1754 | |
1da177e4 | 1755 | restart: |
80c802f3 TT |
1756 | dst = NULL; |
1757 | xdst = NULL; | |
1758 | route = NULL; | |
4e81bb83 | 1759 | |
f7944fb1 | 1760 | if (sk && sk->sk_policy[XFRM_POLICY_OUT]) { |
80c802f3 TT |
1761 | num_pols = 1; |
1762 | pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl); | |
1763 | err = xfrm_expand_policies(fl, family, pols, | |
1764 | &num_pols, &num_xfrms); | |
1765 | if (err < 0) | |
75b8c133 | 1766 | goto dropdst; |
80c802f3 TT |
1767 | |
1768 | if (num_pols) { | |
1769 | if (num_xfrms <= 0) { | |
1770 | drop_pols = num_pols; | |
1771 | goto no_transform; | |
1772 | } | |
1773 | ||
1774 | xdst = xfrm_resolve_and_create_bundle( | |
1775 | pols, num_pols, fl, | |
1776 | family, dst_orig); | |
1777 | if (IS_ERR(xdst)) { | |
1778 | xfrm_pols_put(pols, num_pols); | |
1779 | err = PTR_ERR(xdst); | |
1780 | goto dropdst; | |
d809ec89 TT |
1781 | } else if (xdst == NULL) { |
1782 | num_xfrms = 0; | |
1783 | drop_pols = num_pols; | |
1784 | goto no_transform; | |
80c802f3 TT |
1785 | } |
1786 | ||
1787 | spin_lock_bh(&xfrm_policy_sk_bundle_lock); | |
1788 | xdst->u.dst.next = xfrm_policy_sk_bundles; | |
1789 | xfrm_policy_sk_bundles = &xdst->u.dst; | |
1790 | spin_unlock_bh(&xfrm_policy_sk_bundle_lock); | |
1791 | ||
1792 | route = xdst->route; | |
0aa64774 | 1793 | } |
3bccfbc7 | 1794 | } |
1da177e4 | 1795 | |
80c802f3 | 1796 | if (xdst == NULL) { |
1da177e4 | 1797 | /* To accelerate a bit... */ |
2518c7c2 | 1798 | if ((dst_orig->flags & DST_NOXFRM) || |
52479b62 | 1799 | !net->xfrm.policy_count[XFRM_POLICY_OUT]) |
8b7817f3 | 1800 | goto nopol; |
1da177e4 | 1801 | |
80c802f3 TT |
1802 | flo = flow_cache_lookup(net, fl, family, dir, |
1803 | xfrm_bundle_lookup, dst_orig); | |
1804 | if (flo == NULL) | |
1805 | goto nopol; | |
fe1a5f03 | 1806 | if (IS_ERR(flo)) { |
80c802f3 | 1807 | err = PTR_ERR(flo); |
75b8c133 | 1808 | goto dropdst; |
d66e37a9 | 1809 | } |
80c802f3 TT |
1810 | xdst = container_of(flo, struct xfrm_dst, flo); |
1811 | ||
1812 | num_pols = xdst->num_pols; | |
1813 | num_xfrms = xdst->num_xfrms; | |
1814 | memcpy(pols, xdst->pols, sizeof(struct xfrm_policy*) * num_pols); | |
1815 | route = xdst->route; | |
1816 | } | |
1817 | ||
1818 | dst = &xdst->u.dst; | |
1819 | if (route == NULL && num_xfrms > 0) { | |
1820 | /* The only case when xfrm_bundle_lookup() returns a | |
1821 | * bundle with null route, is when the template could | |
1822 | * not be resolved. It means policies are there, but | |
1823 | * bundle could not be created, since we don't yet | |
1824 | * have the xfrm_state's. We need to wait for KM to | |
1825 | * negotiate new SA's or bail out with error.*/ | |
1826 | if (net->xfrm.sysctl_larval_drop) { | |
1827 | /* EREMOTE tells the caller to generate | |
1828 | * a one-shot blackhole route. */ | |
1829 | dst_release(dst); | |
a1aa3483 | 1830 | xfrm_pols_put(pols, drop_pols); |
80c802f3 TT |
1831 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); |
1832 | return -EREMOTE; | |
1833 | } | |
1834 | if (flags & XFRM_LOOKUP_WAIT) { | |
1835 | DECLARE_WAITQUEUE(wait, current); | |
1836 | ||
1837 | add_wait_queue(&net->xfrm.km_waitq, &wait); | |
1838 | set_current_state(TASK_INTERRUPTIBLE); | |
1839 | schedule(); | |
1840 | set_current_state(TASK_RUNNING); | |
1841 | remove_wait_queue(&net->xfrm.km_waitq, &wait); | |
1842 | ||
1843 | if (!signal_pending(current)) { | |
1844 | dst_release(dst); | |
1845 | goto restart; | |
1846 | } | |
1847 | ||
1848 | err = -ERESTART; | |
1849 | } else | |
1850 | err = -EAGAIN; | |
1851 | ||
1852 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); | |
1853 | goto error; | |
1da177e4 LT |
1854 | } |
1855 | ||
80c802f3 TT |
1856 | no_transform: |
1857 | if (num_pols == 0) | |
8b7817f3 | 1858 | goto nopol; |
1da177e4 | 1859 | |
80c802f3 TT |
1860 | if ((flags & XFRM_LOOKUP_ICMP) && |
1861 | !(pols[0]->flags & XFRM_POLICY_ICMP)) { | |
1862 | err = -ENOENT; | |
8b7817f3 | 1863 | goto error; |
80c802f3 | 1864 | } |
8b7817f3 | 1865 | |
80c802f3 TT |
1866 | for (i = 0; i < num_pols; i++) |
1867 | pols[i]->curlft.use_time = get_seconds(); | |
8b7817f3 | 1868 | |
80c802f3 | 1869 | if (num_xfrms < 0) { |
1da177e4 | 1870 | /* Prohibit the flow */ |
59c9940e | 1871 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK); |
e104411b PM |
1872 | err = -EPERM; |
1873 | goto error; | |
80c802f3 TT |
1874 | } else if (num_xfrms > 0) { |
1875 | /* Flow transformed */ | |
1876 | *dst_p = dst; | |
1877 | dst_release(dst_orig); | |
1878 | } else { | |
1879 | /* Flow passes untransformed */ | |
1880 | dst_release(dst); | |
1da177e4 | 1881 | } |
80c802f3 TT |
1882 | ok: |
1883 | xfrm_pols_put(pols, drop_pols); | |
1da177e4 LT |
1884 | return 0; |
1885 | ||
80c802f3 TT |
1886 | nopol: |
1887 | if (!(flags & XFRM_LOOKUP_ICMP)) | |
1888 | goto ok; | |
1889 | err = -ENOENT; | |
1da177e4 | 1890 | error: |
80c802f3 | 1891 | dst_release(dst); |
75b8c133 HX |
1892 | dropdst: |
1893 | dst_release(dst_orig); | |
1da177e4 | 1894 | *dst_p = NULL; |
80c802f3 | 1895 | xfrm_pols_put(pols, drop_pols); |
1da177e4 LT |
1896 | return err; |
1897 | } | |
14e50e57 DM |
1898 | EXPORT_SYMBOL(__xfrm_lookup); |
1899 | ||
dee9f4bc DM |
1900 | int xfrm_lookup(struct net *net, struct dst_entry **dst_p, |
1901 | const struct flowi *fl, | |
14e50e57 DM |
1902 | struct sock *sk, int flags) |
1903 | { | |
52479b62 | 1904 | int err = __xfrm_lookup(net, dst_p, fl, sk, flags); |
14e50e57 DM |
1905 | |
1906 | if (err == -EREMOTE) { | |
1907 | dst_release(*dst_p); | |
1908 | *dst_p = NULL; | |
1909 | err = -EAGAIN; | |
1910 | } | |
1911 | ||
1912 | return err; | |
1913 | } | |
1da177e4 LT |
1914 | EXPORT_SYMBOL(xfrm_lookup); |
1915 | ||
df0ba92a | 1916 | static inline int |
8f029de2 | 1917 | xfrm_secpath_reject(int idx, struct sk_buff *skb, const struct flowi *fl) |
df0ba92a MN |
1918 | { |
1919 | struct xfrm_state *x; | |
df0ba92a MN |
1920 | |
1921 | if (!skb->sp || idx < 0 || idx >= skb->sp->len) | |
1922 | return 0; | |
1923 | x = skb->sp->xvec[idx]; | |
1924 | if (!x->type->reject) | |
1925 | return 0; | |
1ecafede | 1926 | return x->type->reject(x, skb, fl); |
df0ba92a MN |
1927 | } |
1928 | ||
1da177e4 LT |
1929 | /* When skb is transformed back to its "native" form, we have to |
1930 | * check policy restrictions. At the moment we make this in maximally | |
1931 | * stupid way. Shame on me. :-) Of course, connected sockets must | |
1932 | * have policy cached at them. | |
1933 | */ | |
1934 | ||
1935 | static inline int | |
a716c119 | 1936 | xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x, |
1da177e4 LT |
1937 | unsigned short family) |
1938 | { | |
1939 | if (xfrm_state_kern(x)) | |
928ba416 | 1940 | return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family); |
1da177e4 LT |
1941 | return x->id.proto == tmpl->id.proto && |
1942 | (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && | |
1943 | (x->props.reqid == tmpl->reqid || !tmpl->reqid) && | |
1944 | x->props.mode == tmpl->mode && | |
c5d18e98 | 1945 | (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) || |
f3bd4840 | 1946 | !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) && |
7e49e6de MN |
1947 | !(x->props.mode != XFRM_MODE_TRANSPORT && |
1948 | xfrm_state_addr_cmp(tmpl, x, family)); | |
1da177e4 LT |
1949 | } |
1950 | ||
df0ba92a MN |
1951 | /* |
1952 | * 0 or more than 0 is returned when validation is succeeded (either bypass | |
1953 | * because of optional transport mode, or next index of the mathced secpath | |
1954 | * state with the template. | |
1955 | * -1 is returned when no matching template is found. | |
1956 | * Otherwise "-2 - errored_index" is returned. | |
1957 | */ | |
1da177e4 LT |
1958 | static inline int |
1959 | xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start, | |
1960 | unsigned short family) | |
1961 | { | |
1962 | int idx = start; | |
1963 | ||
1964 | if (tmpl->optional) { | |
7e49e6de | 1965 | if (tmpl->mode == XFRM_MODE_TRANSPORT) |
1da177e4 LT |
1966 | return start; |
1967 | } else | |
1968 | start = -1; | |
1969 | for (; idx < sp->len; idx++) { | |
dbe5b4aa | 1970 | if (xfrm_state_ok(tmpl, sp->xvec[idx], family)) |
1da177e4 | 1971 | return ++idx; |
df0ba92a MN |
1972 | if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) { |
1973 | if (start == -1) | |
1974 | start = -2-idx; | |
1da177e4 | 1975 | break; |
df0ba92a | 1976 | } |
1da177e4 LT |
1977 | } |
1978 | return start; | |
1979 | } | |
1980 | ||
d5422efe HX |
1981 | int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, |
1982 | unsigned int family, int reverse) | |
1da177e4 LT |
1983 | { |
1984 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
e0d1caa7 | 1985 | int err; |
1da177e4 LT |
1986 | |
1987 | if (unlikely(afinfo == NULL)) | |
1988 | return -EAFNOSUPPORT; | |
1989 | ||
d5422efe | 1990 | afinfo->decode_session(skb, fl, reverse); |
beb8d13b | 1991 | err = security_xfrm_decode_session(skb, &fl->secid); |
1da177e4 | 1992 | xfrm_policy_put_afinfo(afinfo); |
e0d1caa7 | 1993 | return err; |
1da177e4 | 1994 | } |
d5422efe | 1995 | EXPORT_SYMBOL(__xfrm_decode_session); |
1da177e4 | 1996 | |
df0ba92a | 1997 | static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp) |
1da177e4 LT |
1998 | { |
1999 | for (; k < sp->len; k++) { | |
df0ba92a | 2000 | if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) { |
d1d9facf | 2001 | *idxp = k; |
1da177e4 | 2002 | return 1; |
df0ba92a | 2003 | } |
1da177e4 LT |
2004 | } |
2005 | ||
2006 | return 0; | |
2007 | } | |
2008 | ||
a716c119 | 2009 | int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, |
1da177e4 LT |
2010 | unsigned short family) |
2011 | { | |
f6e1e25d | 2012 | struct net *net = dev_net(skb->dev); |
1da177e4 | 2013 | struct xfrm_policy *pol; |
4e81bb83 MN |
2014 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
2015 | int npols = 0; | |
2016 | int xfrm_nr; | |
2017 | int pi; | |
d5422efe | 2018 | int reverse; |
1da177e4 | 2019 | struct flowi fl; |
d5422efe | 2020 | u8 fl_dir; |
df0ba92a | 2021 | int xerr_idx = -1; |
1da177e4 | 2022 | |
d5422efe HX |
2023 | reverse = dir & ~XFRM_POLICY_MASK; |
2024 | dir &= XFRM_POLICY_MASK; | |
2025 | fl_dir = policy_to_flow_dir(dir); | |
2026 | ||
0aa64774 | 2027 | if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) { |
59c9940e | 2028 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); |
1da177e4 | 2029 | return 0; |
0aa64774 MN |
2030 | } |
2031 | ||
eb9c7ebe | 2032 | nf_nat_decode_session(skb, &fl, family); |
1da177e4 LT |
2033 | |
2034 | /* First, check used SA against their selectors. */ | |
2035 | if (skb->sp) { | |
2036 | int i; | |
2037 | ||
2038 | for (i=skb->sp->len-1; i>=0; i--) { | |
dbe5b4aa | 2039 | struct xfrm_state *x = skb->sp->xvec[i]; |
0aa64774 | 2040 | if (!xfrm_selector_match(&x->sel, &fl, family)) { |
59c9940e | 2041 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH); |
1da177e4 | 2042 | return 0; |
0aa64774 | 2043 | } |
1da177e4 LT |
2044 | } |
2045 | } | |
2046 | ||
2047 | pol = NULL; | |
3bccfbc7 | 2048 | if (sk && sk->sk_policy[dir]) { |
e0d1caa7 | 2049 | pol = xfrm_sk_policy_lookup(sk, dir, &fl); |
0aa64774 | 2050 | if (IS_ERR(pol)) { |
59c9940e | 2051 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
3bccfbc7 | 2052 | return 0; |
0aa64774 | 2053 | } |
3bccfbc7 | 2054 | } |
1da177e4 | 2055 | |
fe1a5f03 TT |
2056 | if (!pol) { |
2057 | struct flow_cache_object *flo; | |
2058 | ||
2059 | flo = flow_cache_lookup(net, &fl, family, fl_dir, | |
2060 | xfrm_policy_lookup, NULL); | |
2061 | if (IS_ERR_OR_NULL(flo)) | |
2062 | pol = ERR_CAST(flo); | |
2063 | else | |
2064 | pol = container_of(flo, struct xfrm_policy, flo); | |
2065 | } | |
1da177e4 | 2066 | |
0aa64774 | 2067 | if (IS_ERR(pol)) { |
59c9940e | 2068 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
134b0fc5 | 2069 | return 0; |
0aa64774 | 2070 | } |
134b0fc5 | 2071 | |
df0ba92a | 2072 | if (!pol) { |
d1d9facf | 2073 | if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) { |
df0ba92a | 2074 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
59c9940e | 2075 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS); |
df0ba92a MN |
2076 | return 0; |
2077 | } | |
2078 | return 1; | |
2079 | } | |
1da177e4 | 2080 | |
9d729f72 | 2081 | pol->curlft.use_time = get_seconds(); |
1da177e4 | 2082 | |
4e81bb83 MN |
2083 | pols[0] = pol; |
2084 | npols ++; | |
2085 | #ifdef CONFIG_XFRM_SUB_POLICY | |
2086 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
f6e1e25d | 2087 | pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, |
4e81bb83 MN |
2088 | &fl, family, |
2089 | XFRM_POLICY_IN); | |
2090 | if (pols[1]) { | |
0aa64774 | 2091 | if (IS_ERR(pols[1])) { |
59c9940e | 2092 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
134b0fc5 | 2093 | return 0; |
0aa64774 | 2094 | } |
9d729f72 | 2095 | pols[1]->curlft.use_time = get_seconds(); |
4e81bb83 MN |
2096 | npols ++; |
2097 | } | |
2098 | } | |
2099 | #endif | |
2100 | ||
1da177e4 LT |
2101 | if (pol->action == XFRM_POLICY_ALLOW) { |
2102 | struct sec_path *sp; | |
2103 | static struct sec_path dummy; | |
4e81bb83 | 2104 | struct xfrm_tmpl *tp[XFRM_MAX_DEPTH]; |
41a49cc3 | 2105 | struct xfrm_tmpl *stp[XFRM_MAX_DEPTH]; |
4e81bb83 MN |
2106 | struct xfrm_tmpl **tpp = tp; |
2107 | int ti = 0; | |
1da177e4 LT |
2108 | int i, k; |
2109 | ||
2110 | if ((sp = skb->sp) == NULL) | |
2111 | sp = &dummy; | |
2112 | ||
4e81bb83 MN |
2113 | for (pi = 0; pi < npols; pi++) { |
2114 | if (pols[pi] != pol && | |
0aa64774 | 2115 | pols[pi]->action != XFRM_POLICY_ALLOW) { |
59c9940e | 2116 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); |
4e81bb83 | 2117 | goto reject; |
0aa64774 MN |
2118 | } |
2119 | if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
59c9940e | 2120 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); |
4e81bb83 | 2121 | goto reject_error; |
0aa64774 | 2122 | } |
4e81bb83 MN |
2123 | for (i = 0; i < pols[pi]->xfrm_nr; i++) |
2124 | tpp[ti++] = &pols[pi]->xfrm_vec[i]; | |
2125 | } | |
2126 | xfrm_nr = ti; | |
41a49cc3 MN |
2127 | if (npols > 1) { |
2128 | xfrm_tmpl_sort(stp, tpp, xfrm_nr, family); | |
2129 | tpp = stp; | |
2130 | } | |
4e81bb83 | 2131 | |
1da177e4 LT |
2132 | /* For each tunnel xfrm, find the first matching tmpl. |
2133 | * For each tmpl before that, find corresponding xfrm. | |
2134 | * Order is _important_. Later we will implement | |
2135 | * some barriers, but at the moment barriers | |
2136 | * are implied between each two transformations. | |
2137 | */ | |
4e81bb83 MN |
2138 | for (i = xfrm_nr-1, k = 0; i >= 0; i--) { |
2139 | k = xfrm_policy_ok(tpp[i], sp, k, family); | |
df0ba92a | 2140 | if (k < 0) { |
d1d9facf JM |
2141 | if (k < -1) |
2142 | /* "-2 - errored_index" returned */ | |
2143 | xerr_idx = -(2+k); | |
59c9940e | 2144 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 2145 | goto reject; |
df0ba92a | 2146 | } |
1da177e4 LT |
2147 | } |
2148 | ||
0aa64774 | 2149 | if (secpath_has_nontransport(sp, k, &xerr_idx)) { |
59c9940e | 2150 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 2151 | goto reject; |
0aa64774 | 2152 | } |
1da177e4 | 2153 | |
4e81bb83 | 2154 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
2155 | return 1; |
2156 | } | |
59c9940e | 2157 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); |
1da177e4 LT |
2158 | |
2159 | reject: | |
df0ba92a | 2160 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
4e81bb83 MN |
2161 | reject_error: |
2162 | xfrm_pols_put(pols, npols); | |
1da177e4 LT |
2163 | return 0; |
2164 | } | |
2165 | EXPORT_SYMBOL(__xfrm_policy_check); | |
2166 | ||
2167 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
2168 | { | |
99a66657 | 2169 | struct net *net = dev_net(skb->dev); |
1da177e4 | 2170 | struct flowi fl; |
adf30907 ED |
2171 | struct dst_entry *dst; |
2172 | int res; | |
1da177e4 | 2173 | |
0aa64774 | 2174 | if (xfrm_decode_session(skb, &fl, family) < 0) { |
72032fdb | 2175 | XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR); |
1da177e4 | 2176 | return 0; |
0aa64774 | 2177 | } |
1da177e4 | 2178 | |
fafeeb6c | 2179 | skb_dst_force(skb); |
adf30907 ED |
2180 | dst = skb_dst(skb); |
2181 | ||
2182 | res = xfrm_lookup(net, &dst, &fl, NULL, 0) == 0; | |
2183 | skb_dst_set(skb, dst); | |
2184 | return res; | |
1da177e4 LT |
2185 | } |
2186 | EXPORT_SYMBOL(__xfrm_route_forward); | |
2187 | ||
d49c73c7 DM |
2188 | /* Optimize later using cookies and generation ids. */ |
2189 | ||
1da177e4 LT |
2190 | static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) |
2191 | { | |
d49c73c7 DM |
2192 | /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete |
2193 | * to "-1" to force all XFRM destinations to get validated by | |
2194 | * dst_ops->check on every use. We do this because when a | |
2195 | * normal route referenced by an XFRM dst is obsoleted we do | |
2196 | * not go looking around for all parent referencing XFRM dsts | |
2197 | * so that we can invalidate them. It is just too much work. | |
2198 | * Instead we make the checks here on every use. For example: | |
2199 | * | |
2200 | * XFRM dst A --> IPv4 dst X | |
2201 | * | |
2202 | * X is the "xdst->route" of A (X is also the "dst->path" of A | |
2203 | * in this example). If X is marked obsolete, "A" will not | |
2204 | * notice. That's what we are validating here via the | |
2205 | * stale_bundle() check. | |
2206 | * | |
2207 | * When a policy's bundle is pruned, we dst_free() the XFRM | |
2208 | * dst which causes it's ->obsolete field to be set to a | |
2209 | * positive non-zero integer. If an XFRM dst has been pruned | |
2210 | * like this, we want to force a new route lookup. | |
399c180a | 2211 | */ |
d49c73c7 DM |
2212 | if (dst->obsolete < 0 && !stale_bundle(dst)) |
2213 | return dst; | |
2214 | ||
1da177e4 LT |
2215 | return NULL; |
2216 | } | |
2217 | ||
2218 | static int stale_bundle(struct dst_entry *dst) | |
2219 | { | |
47209abd | 2220 | return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC); |
1da177e4 LT |
2221 | } |
2222 | ||
aabc9761 | 2223 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
1da177e4 | 2224 | { |
1da177e4 | 2225 | while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { |
c346dca1 | 2226 | dst->dev = dev_net(dev)->loopback_dev; |
de3cb747 | 2227 | dev_hold(dst->dev); |
1da177e4 LT |
2228 | dev_put(dev); |
2229 | } | |
2230 | } | |
aabc9761 | 2231 | EXPORT_SYMBOL(xfrm_dst_ifdown); |
1da177e4 LT |
2232 | |
2233 | static void xfrm_link_failure(struct sk_buff *skb) | |
2234 | { | |
2235 | /* Impossible. Such dst must be popped before reaches point of failure. */ | |
1da177e4 LT |
2236 | } |
2237 | ||
2238 | static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) | |
2239 | { | |
2240 | if (dst) { | |
2241 | if (dst->obsolete) { | |
2242 | dst_release(dst); | |
2243 | dst = NULL; | |
2244 | } | |
2245 | } | |
2246 | return dst; | |
2247 | } | |
2248 | ||
80c802f3 | 2249 | static void __xfrm_garbage_collect(struct net *net) |
1da177e4 | 2250 | { |
80c802f3 | 2251 | struct dst_entry *head, *next; |
1da177e4 | 2252 | |
80c802f3 | 2253 | flow_cache_flush(); |
4e81bb83 | 2254 | |
80c802f3 TT |
2255 | spin_lock_bh(&xfrm_policy_sk_bundle_lock); |
2256 | head = xfrm_policy_sk_bundles; | |
2257 | xfrm_policy_sk_bundles = NULL; | |
2258 | spin_unlock_bh(&xfrm_policy_sk_bundle_lock); | |
2518c7c2 | 2259 | |
80c802f3 TT |
2260 | while (head) { |
2261 | next = head->next; | |
2262 | dst_free(head); | |
2263 | head = next; | |
1da177e4 LT |
2264 | } |
2265 | } | |
2266 | ||
25ee3286 | 2267 | static void xfrm_init_pmtu(struct dst_entry *dst) |
1da177e4 LT |
2268 | { |
2269 | do { | |
2270 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2271 | u32 pmtu, route_mtu_cached; | |
2272 | ||
2273 | pmtu = dst_mtu(dst->child); | |
2274 | xdst->child_mtu_cached = pmtu; | |
2275 | ||
2276 | pmtu = xfrm_state_mtu(dst->xfrm, pmtu); | |
2277 | ||
2278 | route_mtu_cached = dst_mtu(xdst->route); | |
2279 | xdst->route_mtu_cached = route_mtu_cached; | |
2280 | ||
2281 | if (pmtu > route_mtu_cached) | |
2282 | pmtu = route_mtu_cached; | |
2283 | ||
defb3519 | 2284 | dst_metric_set(dst, RTAX_MTU, pmtu); |
1da177e4 LT |
2285 | } while ((dst = dst->next)); |
2286 | } | |
2287 | ||
1da177e4 LT |
2288 | /* Check that the bundle accepts the flow and its components are |
2289 | * still valid. | |
2290 | */ | |
2291 | ||
1c4c40c4 | 2292 | static int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first, |
47209abd | 2293 | const struct flowi *fl, int family) |
1da177e4 LT |
2294 | { |
2295 | struct dst_entry *dst = &first->u.dst; | |
2296 | struct xfrm_dst *last; | |
2297 | u32 mtu; | |
2298 | ||
92d63dec | 2299 | if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || |
1da177e4 LT |
2300 | (dst->dev && !netif_running(dst->dev))) |
2301 | return 0; | |
157bfc25 MN |
2302 | #ifdef CONFIG_XFRM_SUB_POLICY |
2303 | if (fl) { | |
2304 | if (first->origin && !flow_cache_uli_match(first->origin, fl)) | |
2305 | return 0; | |
2306 | if (first->partner && | |
2307 | !xfrm_selector_match(first->partner, fl, family)) | |
2308 | return 0; | |
2309 | } | |
2310 | #endif | |
1da177e4 LT |
2311 | |
2312 | last = NULL; | |
2313 | ||
2314 | do { | |
2315 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2316 | ||
2317 | if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family)) | |
2318 | return 0; | |
67f83cbf VY |
2319 | if (fl && pol && |
2320 | !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl)) | |
e0d1caa7 | 2321 | return 0; |
1da177e4 LT |
2322 | if (dst->xfrm->km.state != XFRM_STATE_VALID) |
2323 | return 0; | |
80c802f3 TT |
2324 | if (xdst->xfrm_genid != dst->xfrm->genid) |
2325 | return 0; | |
b1312c89 TT |
2326 | if (xdst->num_pols > 0 && |
2327 | xdst->policy_genid != atomic_read(&xdst->pols[0]->genid)) | |
9d4a706d | 2328 | return 0; |
e53820de | 2329 | |
1da177e4 LT |
2330 | mtu = dst_mtu(dst->child); |
2331 | if (xdst->child_mtu_cached != mtu) { | |
2332 | last = xdst; | |
2333 | xdst->child_mtu_cached = mtu; | |
2334 | } | |
2335 | ||
92d63dec | 2336 | if (!dst_check(xdst->route, xdst->route_cookie)) |
1da177e4 LT |
2337 | return 0; |
2338 | mtu = dst_mtu(xdst->route); | |
2339 | if (xdst->route_mtu_cached != mtu) { | |
2340 | last = xdst; | |
2341 | xdst->route_mtu_cached = mtu; | |
2342 | } | |
2343 | ||
2344 | dst = dst->child; | |
2345 | } while (dst->xfrm); | |
2346 | ||
2347 | if (likely(!last)) | |
2348 | return 1; | |
2349 | ||
2350 | mtu = last->child_mtu_cached; | |
2351 | for (;;) { | |
2352 | dst = &last->u.dst; | |
2353 | ||
2354 | mtu = xfrm_state_mtu(dst->xfrm, mtu); | |
2355 | if (mtu > last->route_mtu_cached) | |
2356 | mtu = last->route_mtu_cached; | |
defb3519 | 2357 | dst_metric_set(dst, RTAX_MTU, mtu); |
1da177e4 LT |
2358 | |
2359 | if (last == first) | |
2360 | break; | |
2361 | ||
bd0bf076 | 2362 | last = (struct xfrm_dst *)last->u.dst.next; |
1da177e4 LT |
2363 | last->child_mtu_cached = mtu; |
2364 | } | |
2365 | ||
2366 | return 1; | |
2367 | } | |
2368 | ||
0dbaee3b DM |
2369 | static unsigned int xfrm_default_advmss(const struct dst_entry *dst) |
2370 | { | |
2371 | return dst_metric_advmss(dst->path); | |
2372 | } | |
2373 | ||
d33e4553 DM |
2374 | static unsigned int xfrm_default_mtu(const struct dst_entry *dst) |
2375 | { | |
2376 | return dst_mtu(dst->path); | |
2377 | } | |
2378 | ||
1da177e4 LT |
2379 | int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) |
2380 | { | |
d7c7544c | 2381 | struct net *net; |
1da177e4 LT |
2382 | int err = 0; |
2383 | if (unlikely(afinfo == NULL)) | |
2384 | return -EINVAL; | |
2385 | if (unlikely(afinfo->family >= NPROTO)) | |
2386 | return -EAFNOSUPPORT; | |
e959d812 | 2387 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2388 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) |
2389 | err = -ENOBUFS; | |
2390 | else { | |
2391 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2392 | if (likely(dst_ops->kmem_cachep == NULL)) | |
2393 | dst_ops->kmem_cachep = xfrm_dst_cache; | |
2394 | if (likely(dst_ops->check == NULL)) | |
2395 | dst_ops->check = xfrm_dst_check; | |
0dbaee3b DM |
2396 | if (likely(dst_ops->default_advmss == NULL)) |
2397 | dst_ops->default_advmss = xfrm_default_advmss; | |
d33e4553 DM |
2398 | if (likely(dst_ops->default_mtu == NULL)) |
2399 | dst_ops->default_mtu = xfrm_default_mtu; | |
1da177e4 LT |
2400 | if (likely(dst_ops->negative_advice == NULL)) |
2401 | dst_ops->negative_advice = xfrm_negative_advice; | |
2402 | if (likely(dst_ops->link_failure == NULL)) | |
2403 | dst_ops->link_failure = xfrm_link_failure; | |
1da177e4 LT |
2404 | if (likely(afinfo->garbage_collect == NULL)) |
2405 | afinfo->garbage_collect = __xfrm_garbage_collect; | |
2406 | xfrm_policy_afinfo[afinfo->family] = afinfo; | |
2407 | } | |
e959d812 | 2408 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
d7c7544c AD |
2409 | |
2410 | rtnl_lock(); | |
2411 | for_each_net(net) { | |
2412 | struct dst_ops *xfrm_dst_ops; | |
2413 | ||
2414 | switch (afinfo->family) { | |
2415 | case AF_INET: | |
2416 | xfrm_dst_ops = &net->xfrm.xfrm4_dst_ops; | |
2417 | break; | |
2418 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
2419 | case AF_INET6: | |
2420 | xfrm_dst_ops = &net->xfrm.xfrm6_dst_ops; | |
2421 | break; | |
2422 | #endif | |
2423 | default: | |
2424 | BUG(); | |
2425 | } | |
2426 | *xfrm_dst_ops = *afinfo->dst_ops; | |
2427 | } | |
2428 | rtnl_unlock(); | |
2429 | ||
1da177e4 LT |
2430 | return err; |
2431 | } | |
2432 | EXPORT_SYMBOL(xfrm_policy_register_afinfo); | |
2433 | ||
2434 | int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2435 | { | |
2436 | int err = 0; | |
2437 | if (unlikely(afinfo == NULL)) | |
2438 | return -EINVAL; | |
2439 | if (unlikely(afinfo->family >= NPROTO)) | |
2440 | return -EAFNOSUPPORT; | |
e959d812 | 2441 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2442 | if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { |
2443 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) | |
2444 | err = -EINVAL; | |
2445 | else { | |
2446 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2447 | xfrm_policy_afinfo[afinfo->family] = NULL; | |
2448 | dst_ops->kmem_cachep = NULL; | |
2449 | dst_ops->check = NULL; | |
1da177e4 LT |
2450 | dst_ops->negative_advice = NULL; |
2451 | dst_ops->link_failure = NULL; | |
1da177e4 LT |
2452 | afinfo->garbage_collect = NULL; |
2453 | } | |
2454 | } | |
e959d812 | 2455 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2456 | return err; |
2457 | } | |
2458 | EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); | |
2459 | ||
d7c7544c AD |
2460 | static void __net_init xfrm_dst_ops_init(struct net *net) |
2461 | { | |
2462 | struct xfrm_policy_afinfo *afinfo; | |
2463 | ||
2464 | read_lock_bh(&xfrm_policy_afinfo_lock); | |
2465 | afinfo = xfrm_policy_afinfo[AF_INET]; | |
2466 | if (afinfo) | |
2467 | net->xfrm.xfrm4_dst_ops = *afinfo->dst_ops; | |
2468 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
2469 | afinfo = xfrm_policy_afinfo[AF_INET6]; | |
2470 | if (afinfo) | |
2471 | net->xfrm.xfrm6_dst_ops = *afinfo->dst_ops; | |
2472 | #endif | |
2473 | read_unlock_bh(&xfrm_policy_afinfo_lock); | |
2474 | } | |
2475 | ||
1da177e4 LT |
2476 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) |
2477 | { | |
2478 | struct xfrm_policy_afinfo *afinfo; | |
2479 | if (unlikely(family >= NPROTO)) | |
2480 | return NULL; | |
2481 | read_lock(&xfrm_policy_afinfo_lock); | |
2482 | afinfo = xfrm_policy_afinfo[family]; | |
546be240 HX |
2483 | if (unlikely(!afinfo)) |
2484 | read_unlock(&xfrm_policy_afinfo_lock); | |
1da177e4 LT |
2485 | return afinfo; |
2486 | } | |
2487 | ||
2488 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2489 | { | |
546be240 HX |
2490 | read_unlock(&xfrm_policy_afinfo_lock); |
2491 | } | |
2492 | ||
1da177e4 LT |
2493 | static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) |
2494 | { | |
e9dc8653 EB |
2495 | struct net_device *dev = ptr; |
2496 | ||
1da177e4 LT |
2497 | switch (event) { |
2498 | case NETDEV_DOWN: | |
80c802f3 | 2499 | __xfrm_garbage_collect(dev_net(dev)); |
1da177e4 LT |
2500 | } |
2501 | return NOTIFY_DONE; | |
2502 | } | |
2503 | ||
2504 | static struct notifier_block xfrm_dev_notifier = { | |
d5917a35 | 2505 | .notifier_call = xfrm_dev_event, |
1da177e4 LT |
2506 | }; |
2507 | ||
558f82ef | 2508 | #ifdef CONFIG_XFRM_STATISTICS |
59c9940e | 2509 | static int __net_init xfrm_statistics_init(struct net *net) |
558f82ef | 2510 | { |
c68cd1a0 AD |
2511 | int rv; |
2512 | ||
7d720c3e | 2513 | if (snmp_mib_init((void __percpu **)net->mib.xfrm_statistics, |
1823e4c8 ED |
2514 | sizeof(struct linux_xfrm_mib), |
2515 | __alignof__(struct linux_xfrm_mib)) < 0) | |
558f82ef | 2516 | return -ENOMEM; |
c68cd1a0 AD |
2517 | rv = xfrm_proc_init(net); |
2518 | if (rv < 0) | |
7d720c3e | 2519 | snmp_mib_free((void __percpu **)net->mib.xfrm_statistics); |
c68cd1a0 | 2520 | return rv; |
558f82ef | 2521 | } |
59c9940e AD |
2522 | |
2523 | static void xfrm_statistics_fini(struct net *net) | |
2524 | { | |
c68cd1a0 | 2525 | xfrm_proc_fini(net); |
7d720c3e | 2526 | snmp_mib_free((void __percpu **)net->mib.xfrm_statistics); |
59c9940e AD |
2527 | } |
2528 | #else | |
2529 | static int __net_init xfrm_statistics_init(struct net *net) | |
2530 | { | |
2531 | return 0; | |
2532 | } | |
2533 | ||
2534 | static void xfrm_statistics_fini(struct net *net) | |
2535 | { | |
2536 | } | |
558f82ef MN |
2537 | #endif |
2538 | ||
d62ddc21 | 2539 | static int __net_init xfrm_policy_init(struct net *net) |
1da177e4 | 2540 | { |
2518c7c2 DM |
2541 | unsigned int hmask, sz; |
2542 | int dir; | |
2543 | ||
d62ddc21 AD |
2544 | if (net_eq(net, &init_net)) |
2545 | xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", | |
1da177e4 | 2546 | sizeof(struct xfrm_dst), |
e5d679f3 | 2547 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
20c2df83 | 2548 | NULL); |
1da177e4 | 2549 | |
2518c7c2 DM |
2550 | hmask = 8 - 1; |
2551 | sz = (hmask+1) * sizeof(struct hlist_head); | |
2552 | ||
93b851c1 AD |
2553 | net->xfrm.policy_byidx = xfrm_hash_alloc(sz); |
2554 | if (!net->xfrm.policy_byidx) | |
2555 | goto out_byidx; | |
8100bea7 | 2556 | net->xfrm.policy_idx_hmask = hmask; |
2518c7c2 DM |
2557 | |
2558 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
2559 | struct xfrm_policy_hash *htab; | |
2560 | ||
dc2caba7 | 2561 | net->xfrm.policy_count[dir] = 0; |
8b18f8ea | 2562 | INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]); |
2518c7c2 | 2563 | |
a35f6c5d | 2564 | htab = &net->xfrm.policy_bydst[dir]; |
44e36b42 | 2565 | htab->table = xfrm_hash_alloc(sz); |
2518c7c2 | 2566 | if (!htab->table) |
a35f6c5d AD |
2567 | goto out_bydst; |
2568 | htab->hmask = hmask; | |
2518c7c2 DM |
2569 | } |
2570 | ||
adfcf0b2 | 2571 | INIT_LIST_HEAD(&net->xfrm.policy_all); |
66caf628 | 2572 | INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize); |
d62ddc21 AD |
2573 | if (net_eq(net, &init_net)) |
2574 | register_netdevice_notifier(&xfrm_dev_notifier); | |
2575 | return 0; | |
93b851c1 | 2576 | |
a35f6c5d AD |
2577 | out_bydst: |
2578 | for (dir--; dir >= 0; dir--) { | |
2579 | struct xfrm_policy_hash *htab; | |
2580 | ||
2581 | htab = &net->xfrm.policy_bydst[dir]; | |
2582 | xfrm_hash_free(htab->table, sz); | |
2583 | } | |
2584 | xfrm_hash_free(net->xfrm.policy_byidx, sz); | |
93b851c1 AD |
2585 | out_byidx: |
2586 | return -ENOMEM; | |
d62ddc21 AD |
2587 | } |
2588 | ||
2589 | static void xfrm_policy_fini(struct net *net) | |
2590 | { | |
7c2776ee | 2591 | struct xfrm_audit audit_info; |
93b851c1 | 2592 | unsigned int sz; |
8b18f8ea | 2593 | int dir; |
93b851c1 | 2594 | |
7c2776ee AD |
2595 | flush_work(&net->xfrm.policy_hash_work); |
2596 | #ifdef CONFIG_XFRM_SUB_POLICY | |
2597 | audit_info.loginuid = -1; | |
2598 | audit_info.sessionid = -1; | |
2599 | audit_info.secid = 0; | |
2600 | xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, &audit_info); | |
2601 | #endif | |
2602 | audit_info.loginuid = -1; | |
2603 | audit_info.sessionid = -1; | |
2604 | audit_info.secid = 0; | |
2605 | xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info); | |
7c2776ee | 2606 | |
adfcf0b2 | 2607 | WARN_ON(!list_empty(&net->xfrm.policy_all)); |
93b851c1 | 2608 | |
8b18f8ea | 2609 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
a35f6c5d AD |
2610 | struct xfrm_policy_hash *htab; |
2611 | ||
8b18f8ea | 2612 | WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir])); |
a35f6c5d AD |
2613 | |
2614 | htab = &net->xfrm.policy_bydst[dir]; | |
2615 | sz = (htab->hmask + 1); | |
2616 | WARN_ON(!hlist_empty(htab->table)); | |
2617 | xfrm_hash_free(htab->table, sz); | |
8b18f8ea AD |
2618 | } |
2619 | ||
8100bea7 | 2620 | sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head); |
93b851c1 AD |
2621 | WARN_ON(!hlist_empty(net->xfrm.policy_byidx)); |
2622 | xfrm_hash_free(net->xfrm.policy_byidx, sz); | |
1da177e4 LT |
2623 | } |
2624 | ||
d62ddc21 AD |
2625 | static int __net_init xfrm_net_init(struct net *net) |
2626 | { | |
2627 | int rv; | |
2628 | ||
59c9940e AD |
2629 | rv = xfrm_statistics_init(net); |
2630 | if (rv < 0) | |
2631 | goto out_statistics; | |
d62ddc21 AD |
2632 | rv = xfrm_state_init(net); |
2633 | if (rv < 0) | |
2634 | goto out_state; | |
2635 | rv = xfrm_policy_init(net); | |
2636 | if (rv < 0) | |
2637 | goto out_policy; | |
d7c7544c | 2638 | xfrm_dst_ops_init(net); |
b27aeadb AD |
2639 | rv = xfrm_sysctl_init(net); |
2640 | if (rv < 0) | |
2641 | goto out_sysctl; | |
d62ddc21 AD |
2642 | return 0; |
2643 | ||
b27aeadb AD |
2644 | out_sysctl: |
2645 | xfrm_policy_fini(net); | |
d62ddc21 AD |
2646 | out_policy: |
2647 | xfrm_state_fini(net); | |
2648 | out_state: | |
59c9940e AD |
2649 | xfrm_statistics_fini(net); |
2650 | out_statistics: | |
d62ddc21 AD |
2651 | return rv; |
2652 | } | |
2653 | ||
2654 | static void __net_exit xfrm_net_exit(struct net *net) | |
2655 | { | |
b27aeadb | 2656 | xfrm_sysctl_fini(net); |
d62ddc21 AD |
2657 | xfrm_policy_fini(net); |
2658 | xfrm_state_fini(net); | |
59c9940e | 2659 | xfrm_statistics_fini(net); |
d62ddc21 AD |
2660 | } |
2661 | ||
2662 | static struct pernet_operations __net_initdata xfrm_net_ops = { | |
2663 | .init = xfrm_net_init, | |
2664 | .exit = xfrm_net_exit, | |
2665 | }; | |
2666 | ||
1da177e4 LT |
2667 | void __init xfrm_init(void) |
2668 | { | |
d62ddc21 | 2669 | register_pernet_subsys(&xfrm_net_ops); |
1da177e4 LT |
2670 | xfrm_input_init(); |
2671 | } | |
2672 | ||
ab5f5e8b | 2673 | #ifdef CONFIG_AUDITSYSCALL |
1486cbd7 IJ |
2674 | static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp, |
2675 | struct audit_buffer *audit_buf) | |
ab5f5e8b | 2676 | { |
875179fa PM |
2677 | struct xfrm_sec_ctx *ctx = xp->security; |
2678 | struct xfrm_selector *sel = &xp->selector; | |
2679 | ||
2680 | if (ctx) | |
ab5f5e8b | 2681 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", |
875179fa | 2682 | ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); |
ab5f5e8b | 2683 | |
875179fa | 2684 | switch(sel->family) { |
ab5f5e8b | 2685 | case AF_INET: |
21454aaa | 2686 | audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4); |
875179fa PM |
2687 | if (sel->prefixlen_s != 32) |
2688 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2689 | sel->prefixlen_s); | |
21454aaa | 2690 | audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4); |
875179fa PM |
2691 | if (sel->prefixlen_d != 32) |
2692 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2693 | sel->prefixlen_d); | |
ab5f5e8b JL |
2694 | break; |
2695 | case AF_INET6: | |
5b095d98 | 2696 | audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6); |
875179fa PM |
2697 | if (sel->prefixlen_s != 128) |
2698 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2699 | sel->prefixlen_s); | |
5b095d98 | 2700 | audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6); |
875179fa PM |
2701 | if (sel->prefixlen_d != 128) |
2702 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2703 | sel->prefixlen_d); | |
ab5f5e8b JL |
2704 | break; |
2705 | } | |
2706 | } | |
2707 | ||
68277acc | 2708 | void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, |
2532386f | 2709 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2710 | { |
2711 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2712 | |
afeb14b4 | 2713 | audit_buf = xfrm_audit_start("SPD-add"); |
ab5f5e8b JL |
2714 | if (audit_buf == NULL) |
2715 | return; | |
2532386f | 2716 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 | 2717 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
2718 | xfrm_audit_common_policyinfo(xp, audit_buf); |
2719 | audit_log_end(audit_buf); | |
2720 | } | |
2721 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_add); | |
2722 | ||
68277acc | 2723 | void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, |
2532386f | 2724 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2725 | { |
2726 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2727 | |
afeb14b4 | 2728 | audit_buf = xfrm_audit_start("SPD-delete"); |
ab5f5e8b JL |
2729 | if (audit_buf == NULL) |
2730 | return; | |
2532386f | 2731 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 | 2732 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
2733 | xfrm_audit_common_policyinfo(xp, audit_buf); |
2734 | audit_log_end(audit_buf); | |
2735 | } | |
2736 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete); | |
2737 | #endif | |
2738 | ||
80c9abaa | 2739 | #ifdef CONFIG_XFRM_MIGRATE |
b4b7c0b3 DM |
2740 | static int xfrm_migrate_selector_match(const struct xfrm_selector *sel_cmp, |
2741 | const struct xfrm_selector *sel_tgt) | |
80c9abaa SS |
2742 | { |
2743 | if (sel_cmp->proto == IPSEC_ULPROTO_ANY) { | |
2744 | if (sel_tgt->family == sel_cmp->family && | |
2745 | xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr, | |
a716c119 | 2746 | sel_cmp->family) == 0 && |
80c9abaa SS |
2747 | xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr, |
2748 | sel_cmp->family) == 0 && | |
2749 | sel_tgt->prefixlen_d == sel_cmp->prefixlen_d && | |
2750 | sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) { | |
2751 | return 1; | |
2752 | } | |
2753 | } else { | |
2754 | if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) { | |
2755 | return 1; | |
2756 | } | |
2757 | } | |
2758 | return 0; | |
2759 | } | |
2760 | ||
b4b7c0b3 | 2761 | static struct xfrm_policy * xfrm_migrate_policy_find(const struct xfrm_selector *sel, |
80c9abaa SS |
2762 | u8 dir, u8 type) |
2763 | { | |
2764 | struct xfrm_policy *pol, *ret = NULL; | |
2765 | struct hlist_node *entry; | |
2766 | struct hlist_head *chain; | |
2767 | u32 priority = ~0U; | |
2768 | ||
2769 | read_lock_bh(&xfrm_policy_lock); | |
1121994c | 2770 | chain = policy_hash_direct(&init_net, &sel->daddr, &sel->saddr, sel->family, dir); |
80c9abaa SS |
2771 | hlist_for_each_entry(pol, entry, chain, bydst) { |
2772 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2773 | pol->type == type) { | |
2774 | ret = pol; | |
2775 | priority = ret->priority; | |
2776 | break; | |
2777 | } | |
2778 | } | |
8b18f8ea | 2779 | chain = &init_net.xfrm.policy_inexact[dir]; |
80c9abaa SS |
2780 | hlist_for_each_entry(pol, entry, chain, bydst) { |
2781 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2782 | pol->type == type && | |
2783 | pol->priority < priority) { | |
2784 | ret = pol; | |
2785 | break; | |
2786 | } | |
2787 | } | |
2788 | ||
2789 | if (ret) | |
2790 | xfrm_pol_hold(ret); | |
2791 | ||
2792 | read_unlock_bh(&xfrm_policy_lock); | |
2793 | ||
2794 | return ret; | |
2795 | } | |
2796 | ||
dd701754 | 2797 | static int migrate_tmpl_match(const struct xfrm_migrate *m, const struct xfrm_tmpl *t) |
80c9abaa SS |
2798 | { |
2799 | int match = 0; | |
2800 | ||
2801 | if (t->mode == m->mode && t->id.proto == m->proto && | |
2802 | (m->reqid == 0 || t->reqid == m->reqid)) { | |
2803 | switch (t->mode) { | |
2804 | case XFRM_MODE_TUNNEL: | |
2805 | case XFRM_MODE_BEET: | |
2806 | if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr, | |
2807 | m->old_family) == 0 && | |
2808 | xfrm_addr_cmp(&t->saddr, &m->old_saddr, | |
2809 | m->old_family) == 0) { | |
2810 | match = 1; | |
2811 | } | |
2812 | break; | |
2813 | case XFRM_MODE_TRANSPORT: | |
2814 | /* in case of transport mode, template does not store | |
2815 | any IP addresses, hence we just compare mode and | |
2816 | protocol */ | |
2817 | match = 1; | |
2818 | break; | |
2819 | default: | |
2820 | break; | |
2821 | } | |
2822 | } | |
2823 | return match; | |
2824 | } | |
2825 | ||
2826 | /* update endpoint address(es) of template(s) */ | |
2827 | static int xfrm_policy_migrate(struct xfrm_policy *pol, | |
2828 | struct xfrm_migrate *m, int num_migrate) | |
2829 | { | |
2830 | struct xfrm_migrate *mp; | |
80c9abaa SS |
2831 | int i, j, n = 0; |
2832 | ||
2833 | write_lock_bh(&pol->lock); | |
12a169e7 | 2834 | if (unlikely(pol->walk.dead)) { |
80c9abaa SS |
2835 | /* target policy has been deleted */ |
2836 | write_unlock_bh(&pol->lock); | |
2837 | return -ENOENT; | |
2838 | } | |
2839 | ||
2840 | for (i = 0; i < pol->xfrm_nr; i++) { | |
2841 | for (j = 0, mp = m; j < num_migrate; j++, mp++) { | |
2842 | if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i])) | |
2843 | continue; | |
2844 | n++; | |
1bfcb10f HX |
2845 | if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL && |
2846 | pol->xfrm_vec[i].mode != XFRM_MODE_BEET) | |
80c9abaa SS |
2847 | continue; |
2848 | /* update endpoints */ | |
2849 | memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr, | |
2850 | sizeof(pol->xfrm_vec[i].id.daddr)); | |
2851 | memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr, | |
2852 | sizeof(pol->xfrm_vec[i].saddr)); | |
2853 | pol->xfrm_vec[i].encap_family = mp->new_family; | |
2854 | /* flush bundles */ | |
80c802f3 | 2855 | atomic_inc(&pol->genid); |
80c9abaa SS |
2856 | } |
2857 | } | |
2858 | ||
2859 | write_unlock_bh(&pol->lock); | |
2860 | ||
2861 | if (!n) | |
2862 | return -ENODATA; | |
2863 | ||
2864 | return 0; | |
2865 | } | |
2866 | ||
dd701754 | 2867 | static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate) |
80c9abaa SS |
2868 | { |
2869 | int i, j; | |
2870 | ||
2871 | if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) | |
2872 | return -EINVAL; | |
2873 | ||
2874 | for (i = 0; i < num_migrate; i++) { | |
2875 | if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr, | |
2876 | m[i].old_family) == 0) && | |
2877 | (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr, | |
2878 | m[i].old_family) == 0)) | |
2879 | return -EINVAL; | |
2880 | if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) || | |
2881 | xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) | |
2882 | return -EINVAL; | |
2883 | ||
2884 | /* check if there is any duplicated entry */ | |
2885 | for (j = i + 1; j < num_migrate; j++) { | |
2886 | if (!memcmp(&m[i].old_daddr, &m[j].old_daddr, | |
2887 | sizeof(m[i].old_daddr)) && | |
2888 | !memcmp(&m[i].old_saddr, &m[j].old_saddr, | |
2889 | sizeof(m[i].old_saddr)) && | |
2890 | m[i].proto == m[j].proto && | |
2891 | m[i].mode == m[j].mode && | |
2892 | m[i].reqid == m[j].reqid && | |
2893 | m[i].old_family == m[j].old_family) | |
2894 | return -EINVAL; | |
2895 | } | |
2896 | } | |
2897 | ||
2898 | return 0; | |
2899 | } | |
2900 | ||
b4b7c0b3 | 2901 | int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, |
13c1d189 AE |
2902 | struct xfrm_migrate *m, int num_migrate, |
2903 | struct xfrm_kmaddress *k) | |
80c9abaa SS |
2904 | { |
2905 | int i, err, nx_cur = 0, nx_new = 0; | |
2906 | struct xfrm_policy *pol = NULL; | |
2907 | struct xfrm_state *x, *xc; | |
2908 | struct xfrm_state *x_cur[XFRM_MAX_DEPTH]; | |
2909 | struct xfrm_state *x_new[XFRM_MAX_DEPTH]; | |
2910 | struct xfrm_migrate *mp; | |
2911 | ||
2912 | if ((err = xfrm_migrate_check(m, num_migrate)) < 0) | |
2913 | goto out; | |
2914 | ||
2915 | /* Stage 1 - find policy */ | |
2916 | if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) { | |
2917 | err = -ENOENT; | |
2918 | goto out; | |
2919 | } | |
2920 | ||
2921 | /* Stage 2 - find and update state(s) */ | |
2922 | for (i = 0, mp = m; i < num_migrate; i++, mp++) { | |
2923 | if ((x = xfrm_migrate_state_find(mp))) { | |
2924 | x_cur[nx_cur] = x; | |
2925 | nx_cur++; | |
2926 | if ((xc = xfrm_state_migrate(x, mp))) { | |
2927 | x_new[nx_new] = xc; | |
2928 | nx_new++; | |
2929 | } else { | |
2930 | err = -ENODATA; | |
2931 | goto restore_state; | |
2932 | } | |
2933 | } | |
2934 | } | |
2935 | ||
2936 | /* Stage 3 - update policy */ | |
2937 | if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0) | |
2938 | goto restore_state; | |
2939 | ||
2940 | /* Stage 4 - delete old state(s) */ | |
2941 | if (nx_cur) { | |
2942 | xfrm_states_put(x_cur, nx_cur); | |
2943 | xfrm_states_delete(x_cur, nx_cur); | |
2944 | } | |
2945 | ||
2946 | /* Stage 5 - announce */ | |
13c1d189 | 2947 | km_migrate(sel, dir, type, m, num_migrate, k); |
80c9abaa SS |
2948 | |
2949 | xfrm_pol_put(pol); | |
2950 | ||
2951 | return 0; | |
2952 | out: | |
2953 | return err; | |
2954 | ||
2955 | restore_state: | |
2956 | if (pol) | |
2957 | xfrm_pol_put(pol); | |
2958 | if (nx_cur) | |
2959 | xfrm_states_put(x_cur, nx_cur); | |
2960 | if (nx_new) | |
2961 | xfrm_states_delete(x_new, nx_new); | |
2962 | ||
2963 | return err; | |
2964 | } | |
e610e679 | 2965 | EXPORT_SYMBOL(xfrm_migrate); |
80c9abaa | 2966 | #endif |