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, |
54 | struct flowi *fl, int family, int strict); | |
55 | ||
1da177e4 | 56 | |
29fa0b30 WY |
57 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, |
58 | int dir); | |
59 | ||
77681021 AM |
60 | static inline int |
61 | __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl) | |
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 | |
72 | __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl) | |
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 | ||
82 | int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, | |
83 | unsigned short family) | |
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, |
9bb182a7 YH |
95 | xfrm_address_t *saddr, |
96 | xfrm_address_t *daddr, | |
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 | ||
1121994c | 314 | static struct hlist_head *policy_hash_bysel(struct net *net, struct xfrm_selector *sel, unsigned short family, int dir) |
2518c7c2 | 315 | { |
1121994c | 316 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
317 | unsigned int hash = __sel_hash(sel, family, hmask); |
318 | ||
319 | return (hash == hmask + 1 ? | |
1121994c AD |
320 | &net->xfrm.policy_inexact[dir] : |
321 | net->xfrm.policy_bydst[dir].table + hash); | |
2518c7c2 DM |
322 | } |
323 | ||
1121994c | 324 | static struct hlist_head *policy_hash_direct(struct net *net, xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir) |
2518c7c2 | 325 | { |
1121994c | 326 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
327 | unsigned int hash = __addr_hash(daddr, saddr, family, hmask); |
328 | ||
1121994c | 329 | return net->xfrm.policy_bydst[dir].table + hash; |
2518c7c2 DM |
330 | } |
331 | ||
2518c7c2 DM |
332 | static void xfrm_dst_hash_transfer(struct hlist_head *list, |
333 | struct hlist_head *ndsttable, | |
334 | unsigned int nhashmask) | |
335 | { | |
b791160b | 336 | struct hlist_node *entry, *tmp, *entry0 = NULL; |
2518c7c2 | 337 | struct xfrm_policy *pol; |
b791160b | 338 | unsigned int h0 = 0; |
2518c7c2 | 339 | |
b791160b | 340 | redo: |
2518c7c2 DM |
341 | hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) { |
342 | unsigned int h; | |
343 | ||
344 | h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr, | |
345 | pol->family, nhashmask); | |
b791160b YH |
346 | if (!entry0) { |
347 | hlist_del(entry); | |
348 | hlist_add_head(&pol->bydst, ndsttable+h); | |
349 | h0 = h; | |
350 | } else { | |
351 | if (h != h0) | |
352 | continue; | |
353 | hlist_del(entry); | |
354 | hlist_add_after(entry0, &pol->bydst); | |
355 | } | |
356 | entry0 = entry; | |
357 | } | |
358 | if (!hlist_empty(list)) { | |
359 | entry0 = NULL; | |
360 | goto redo; | |
2518c7c2 DM |
361 | } |
362 | } | |
363 | ||
364 | static void xfrm_idx_hash_transfer(struct hlist_head *list, | |
365 | struct hlist_head *nidxtable, | |
366 | unsigned int nhashmask) | |
367 | { | |
368 | struct hlist_node *entry, *tmp; | |
369 | struct xfrm_policy *pol; | |
370 | ||
371 | hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) { | |
372 | unsigned int h; | |
373 | ||
374 | h = __idx_hash(pol->index, nhashmask); | |
375 | hlist_add_head(&pol->byidx, nidxtable+h); | |
376 | } | |
377 | } | |
378 | ||
379 | static unsigned long xfrm_new_hash_mask(unsigned int old_hmask) | |
380 | { | |
381 | return ((old_hmask + 1) << 1) - 1; | |
382 | } | |
383 | ||
66caf628 | 384 | static void xfrm_bydst_resize(struct net *net, int dir) |
2518c7c2 | 385 | { |
66caf628 | 386 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
387 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
388 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
66caf628 | 389 | struct hlist_head *odst = net->xfrm.policy_bydst[dir].table; |
44e36b42 | 390 | struct hlist_head *ndst = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
391 | int i; |
392 | ||
393 | if (!ndst) | |
394 | return; | |
395 | ||
396 | write_lock_bh(&xfrm_policy_lock); | |
397 | ||
398 | for (i = hmask; i >= 0; i--) | |
399 | xfrm_dst_hash_transfer(odst + i, ndst, nhashmask); | |
400 | ||
66caf628 AD |
401 | net->xfrm.policy_bydst[dir].table = ndst; |
402 | net->xfrm.policy_bydst[dir].hmask = nhashmask; | |
2518c7c2 DM |
403 | |
404 | write_unlock_bh(&xfrm_policy_lock); | |
405 | ||
44e36b42 | 406 | xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
407 | } |
408 | ||
66caf628 | 409 | static void xfrm_byidx_resize(struct net *net, int total) |
2518c7c2 | 410 | { |
66caf628 | 411 | unsigned int hmask = net->xfrm.policy_idx_hmask; |
2518c7c2 DM |
412 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
413 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
66caf628 | 414 | struct hlist_head *oidx = net->xfrm.policy_byidx; |
44e36b42 | 415 | struct hlist_head *nidx = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
416 | int i; |
417 | ||
418 | if (!nidx) | |
419 | return; | |
420 | ||
421 | write_lock_bh(&xfrm_policy_lock); | |
422 | ||
423 | for (i = hmask; i >= 0; i--) | |
424 | xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask); | |
425 | ||
66caf628 AD |
426 | net->xfrm.policy_byidx = nidx; |
427 | net->xfrm.policy_idx_hmask = nhashmask; | |
2518c7c2 DM |
428 | |
429 | write_unlock_bh(&xfrm_policy_lock); | |
430 | ||
44e36b42 | 431 | xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
432 | } |
433 | ||
66caf628 | 434 | static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total) |
2518c7c2 | 435 | { |
66caf628 AD |
436 | unsigned int cnt = net->xfrm.policy_count[dir]; |
437 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; | |
2518c7c2 DM |
438 | |
439 | if (total) | |
440 | *total += cnt; | |
441 | ||
442 | if ((hmask + 1) < xfrm_policy_hashmax && | |
443 | cnt > hmask) | |
444 | return 1; | |
445 | ||
446 | return 0; | |
447 | } | |
448 | ||
66caf628 | 449 | static inline int xfrm_byidx_should_resize(struct net *net, int total) |
2518c7c2 | 450 | { |
66caf628 | 451 | unsigned int hmask = net->xfrm.policy_idx_hmask; |
2518c7c2 DM |
452 | |
453 | if ((hmask + 1) < xfrm_policy_hashmax && | |
454 | total > hmask) | |
455 | return 1; | |
456 | ||
457 | return 0; | |
458 | } | |
459 | ||
e071041b | 460 | void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si) |
ecfd6b18 JHS |
461 | { |
462 | read_lock_bh(&xfrm_policy_lock); | |
e071041b AD |
463 | si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN]; |
464 | si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT]; | |
465 | si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD]; | |
466 | si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX]; | |
467 | si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX]; | |
468 | si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX]; | |
469 | si->spdhcnt = net->xfrm.policy_idx_hmask; | |
ecfd6b18 JHS |
470 | si->spdhmcnt = xfrm_policy_hashmax; |
471 | read_unlock_bh(&xfrm_policy_lock); | |
472 | } | |
473 | EXPORT_SYMBOL(xfrm_spd_getinfo); | |
2518c7c2 | 474 | |
ecfd6b18 | 475 | static DEFINE_MUTEX(hash_resize_mutex); |
66caf628 | 476 | static void xfrm_hash_resize(struct work_struct *work) |
2518c7c2 | 477 | { |
66caf628 | 478 | struct net *net = container_of(work, struct net, xfrm.policy_hash_work); |
2518c7c2 DM |
479 | int dir, total; |
480 | ||
481 | mutex_lock(&hash_resize_mutex); | |
482 | ||
483 | total = 0; | |
484 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
66caf628 AD |
485 | if (xfrm_bydst_should_resize(net, dir, &total)) |
486 | xfrm_bydst_resize(net, dir); | |
2518c7c2 | 487 | } |
66caf628 AD |
488 | if (xfrm_byidx_should_resize(net, total)) |
489 | xfrm_byidx_resize(net, total); | |
2518c7c2 DM |
490 | |
491 | mutex_unlock(&hash_resize_mutex); | |
492 | } | |
493 | ||
1da177e4 LT |
494 | /* Generate new index... KAME seems to generate them ordered by cost |
495 | * of an absolute inpredictability of ordering of rules. This will not pass. */ | |
1121994c | 496 | static u32 xfrm_gen_index(struct net *net, int dir) |
1da177e4 | 497 | { |
1da177e4 LT |
498 | static u32 idx_generator; |
499 | ||
500 | for (;;) { | |
2518c7c2 DM |
501 | struct hlist_node *entry; |
502 | struct hlist_head *list; | |
503 | struct xfrm_policy *p; | |
504 | u32 idx; | |
505 | int found; | |
506 | ||
1da177e4 LT |
507 | idx = (idx_generator | dir); |
508 | idx_generator += 8; | |
509 | if (idx == 0) | |
510 | idx = 8; | |
1121994c | 511 | list = net->xfrm.policy_byidx + idx_hash(net, idx); |
2518c7c2 DM |
512 | found = 0; |
513 | hlist_for_each_entry(p, entry, list, byidx) { | |
514 | if (p->index == idx) { | |
515 | found = 1; | |
1da177e4 | 516 | break; |
2518c7c2 | 517 | } |
1da177e4 | 518 | } |
2518c7c2 | 519 | if (!found) |
1da177e4 LT |
520 | return idx; |
521 | } | |
522 | } | |
523 | ||
2518c7c2 DM |
524 | static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2) |
525 | { | |
526 | u32 *p1 = (u32 *) s1; | |
527 | u32 *p2 = (u32 *) s2; | |
528 | int len = sizeof(struct xfrm_selector) / sizeof(u32); | |
529 | int i; | |
530 | ||
531 | for (i = 0; i < len; i++) { | |
532 | if (p1[i] != p2[i]) | |
533 | return 1; | |
534 | } | |
535 | ||
536 | return 0; | |
537 | } | |
538 | ||
1da177e4 LT |
539 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) |
540 | { | |
1121994c | 541 | struct net *net = xp_net(policy); |
2518c7c2 DM |
542 | struct xfrm_policy *pol; |
543 | struct xfrm_policy *delpol; | |
544 | struct hlist_head *chain; | |
a6c7ab55 | 545 | struct hlist_node *entry, *newpos; |
34f8d884 | 546 | u32 mark = policy->mark.v & policy->mark.m; |
1da177e4 LT |
547 | |
548 | write_lock_bh(&xfrm_policy_lock); | |
1121994c | 549 | chain = policy_hash_bysel(net, &policy->selector, policy->family, dir); |
2518c7c2 DM |
550 | delpol = NULL; |
551 | newpos = NULL; | |
2518c7c2 | 552 | hlist_for_each_entry(pol, entry, chain, bydst) { |
a6c7ab55 | 553 | if (pol->type == policy->type && |
2518c7c2 | 554 | !selector_cmp(&pol->selector, &policy->selector) && |
34f8d884 | 555 | (mark & pol->mark.m) == pol->mark.v && |
a6c7ab55 HX |
556 | xfrm_sec_ctx_match(pol->security, policy->security) && |
557 | !WARN_ON(delpol)) { | |
1da177e4 LT |
558 | if (excl) { |
559 | write_unlock_bh(&xfrm_policy_lock); | |
560 | return -EEXIST; | |
561 | } | |
1da177e4 LT |
562 | delpol = pol; |
563 | if (policy->priority > pol->priority) | |
564 | continue; | |
565 | } else if (policy->priority >= pol->priority) { | |
a6c7ab55 | 566 | newpos = &pol->bydst; |
1da177e4 LT |
567 | continue; |
568 | } | |
1da177e4 LT |
569 | if (delpol) |
570 | break; | |
1da177e4 LT |
571 | } |
572 | if (newpos) | |
2518c7c2 DM |
573 | hlist_add_after(newpos, &policy->bydst); |
574 | else | |
575 | hlist_add_head(&policy->bydst, chain); | |
1da177e4 | 576 | xfrm_pol_hold(policy); |
1121994c | 577 | net->xfrm.policy_count[dir]++; |
1da177e4 | 578 | atomic_inc(&flow_cache_genid); |
29fa0b30 WY |
579 | if (delpol) |
580 | __xfrm_policy_unlink(delpol, dir); | |
1121994c AD |
581 | policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir); |
582 | hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index)); | |
9d729f72 | 583 | policy->curlft.add_time = get_seconds(); |
1da177e4 LT |
584 | policy->curlft.use_time = 0; |
585 | if (!mod_timer(&policy->timer, jiffies + HZ)) | |
586 | xfrm_pol_hold(policy); | |
1121994c | 587 | list_add(&policy->walk.all, &net->xfrm.policy_all); |
1da177e4 LT |
588 | write_unlock_bh(&xfrm_policy_lock); |
589 | ||
9b78a82c | 590 | if (delpol) |
1da177e4 | 591 | xfrm_policy_kill(delpol); |
1121994c AD |
592 | else if (xfrm_bydst_should_resize(net, dir, NULL)) |
593 | schedule_work(&net->xfrm.policy_hash_work); | |
9b78a82c | 594 | |
1da177e4 LT |
595 | return 0; |
596 | } | |
597 | EXPORT_SYMBOL(xfrm_policy_insert); | |
598 | ||
8ca2e93b JHS |
599 | struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type, |
600 | int dir, struct xfrm_selector *sel, | |
ef41aaa0 EP |
601 | struct xfrm_sec_ctx *ctx, int delete, |
602 | int *err) | |
1da177e4 | 603 | { |
2518c7c2 DM |
604 | struct xfrm_policy *pol, *ret; |
605 | struct hlist_head *chain; | |
606 | struct hlist_node *entry; | |
1da177e4 | 607 | |
ef41aaa0 | 608 | *err = 0; |
1da177e4 | 609 | write_lock_bh(&xfrm_policy_lock); |
8d1211a6 | 610 | chain = policy_hash_bysel(net, sel, sel->family, dir); |
2518c7c2 DM |
611 | ret = NULL; |
612 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
613 | if (pol->type == type && | |
34f8d884 | 614 | (mark & pol->mark.m) == pol->mark.v && |
2518c7c2 DM |
615 | !selector_cmp(sel, &pol->selector) && |
616 | xfrm_sec_ctx_match(ctx, pol->security)) { | |
1da177e4 | 617 | xfrm_pol_hold(pol); |
2518c7c2 | 618 | if (delete) { |
03e1ad7b PM |
619 | *err = security_xfrm_policy_delete( |
620 | pol->security); | |
ef41aaa0 EP |
621 | if (*err) { |
622 | write_unlock_bh(&xfrm_policy_lock); | |
623 | return pol; | |
624 | } | |
29fa0b30 | 625 | __xfrm_policy_unlink(pol, dir); |
2518c7c2 DM |
626 | } |
627 | ret = pol; | |
1da177e4 LT |
628 | break; |
629 | } | |
630 | } | |
631 | write_unlock_bh(&xfrm_policy_lock); | |
632 | ||
fe1a5f03 | 633 | if (ret && delete) |
2518c7c2 | 634 | xfrm_policy_kill(ret); |
2518c7c2 | 635 | return ret; |
1da177e4 | 636 | } |
df71837d | 637 | EXPORT_SYMBOL(xfrm_policy_bysel_ctx); |
1da177e4 | 638 | |
8ca2e93b JHS |
639 | struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type, |
640 | int dir, u32 id, int delete, int *err) | |
1da177e4 | 641 | { |
2518c7c2 DM |
642 | struct xfrm_policy *pol, *ret; |
643 | struct hlist_head *chain; | |
644 | struct hlist_node *entry; | |
1da177e4 | 645 | |
b5505c6e HX |
646 | *err = -ENOENT; |
647 | if (xfrm_policy_id2dir(id) != dir) | |
648 | return NULL; | |
649 | ||
ef41aaa0 | 650 | *err = 0; |
1da177e4 | 651 | write_lock_bh(&xfrm_policy_lock); |
8d1211a6 | 652 | chain = net->xfrm.policy_byidx + idx_hash(net, id); |
2518c7c2 DM |
653 | ret = NULL; |
654 | hlist_for_each_entry(pol, entry, chain, byidx) { | |
34f8d884 JHS |
655 | if (pol->type == type && pol->index == id && |
656 | (mark & pol->mark.m) == pol->mark.v) { | |
1da177e4 | 657 | xfrm_pol_hold(pol); |
2518c7c2 | 658 | if (delete) { |
03e1ad7b PM |
659 | *err = security_xfrm_policy_delete( |
660 | pol->security); | |
ef41aaa0 EP |
661 | if (*err) { |
662 | write_unlock_bh(&xfrm_policy_lock); | |
663 | return pol; | |
664 | } | |
29fa0b30 | 665 | __xfrm_policy_unlink(pol, dir); |
2518c7c2 DM |
666 | } |
667 | ret = pol; | |
1da177e4 LT |
668 | break; |
669 | } | |
670 | } | |
671 | write_unlock_bh(&xfrm_policy_lock); | |
672 | ||
fe1a5f03 | 673 | if (ret && delete) |
2518c7c2 | 674 | xfrm_policy_kill(ret); |
2518c7c2 | 675 | return ret; |
1da177e4 LT |
676 | } |
677 | EXPORT_SYMBOL(xfrm_policy_byid); | |
678 | ||
4aa2e62c JL |
679 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
680 | static inline int | |
33ffbbd5 | 681 | xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info) |
1da177e4 | 682 | { |
4aa2e62c JL |
683 | int dir, err = 0; |
684 | ||
685 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { | |
686 | struct xfrm_policy *pol; | |
687 | struct hlist_node *entry; | |
688 | int i; | |
689 | ||
690 | hlist_for_each_entry(pol, entry, | |
33ffbbd5 | 691 | &net->xfrm.policy_inexact[dir], bydst) { |
4aa2e62c JL |
692 | if (pol->type != type) |
693 | continue; | |
03e1ad7b | 694 | err = security_xfrm_policy_delete(pol->security); |
4aa2e62c | 695 | if (err) { |
ab5f5e8b JL |
696 | xfrm_audit_policy_delete(pol, 0, |
697 | audit_info->loginuid, | |
2532386f | 698 | audit_info->sessionid, |
ab5f5e8b | 699 | audit_info->secid); |
4aa2e62c JL |
700 | return err; |
701 | } | |
7dc12d6d | 702 | } |
33ffbbd5 | 703 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { |
4aa2e62c | 704 | hlist_for_each_entry(pol, entry, |
33ffbbd5 | 705 | net->xfrm.policy_bydst[dir].table + i, |
4aa2e62c JL |
706 | bydst) { |
707 | if (pol->type != type) | |
708 | continue; | |
03e1ad7b PM |
709 | err = security_xfrm_policy_delete( |
710 | pol->security); | |
4aa2e62c | 711 | if (err) { |
ab5f5e8b JL |
712 | xfrm_audit_policy_delete(pol, 0, |
713 | audit_info->loginuid, | |
2532386f | 714 | audit_info->sessionid, |
ab5f5e8b | 715 | audit_info->secid); |
4aa2e62c JL |
716 | return err; |
717 | } | |
718 | } | |
719 | } | |
720 | } | |
721 | return err; | |
722 | } | |
723 | #else | |
724 | static inline int | |
33ffbbd5 | 725 | xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info) |
4aa2e62c JL |
726 | { |
727 | return 0; | |
728 | } | |
729 | #endif | |
730 | ||
33ffbbd5 | 731 | int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info) |
4aa2e62c | 732 | { |
2f1eb65f | 733 | int dir, err = 0, cnt = 0; |
1da177e4 LT |
734 | |
735 | write_lock_bh(&xfrm_policy_lock); | |
4aa2e62c | 736 | |
33ffbbd5 | 737 | err = xfrm_policy_flush_secctx_check(net, type, audit_info); |
4aa2e62c JL |
738 | if (err) |
739 | goto out; | |
740 | ||
1da177e4 | 741 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
2518c7c2 DM |
742 | struct xfrm_policy *pol; |
743 | struct hlist_node *entry; | |
29fa0b30 | 744 | int i; |
2518c7c2 DM |
745 | |
746 | again1: | |
747 | hlist_for_each_entry(pol, entry, | |
33ffbbd5 | 748 | &net->xfrm.policy_inexact[dir], bydst) { |
2518c7c2 DM |
749 | if (pol->type != type) |
750 | continue; | |
ea2dea9d | 751 | __xfrm_policy_unlink(pol, dir); |
1da177e4 | 752 | write_unlock_bh(&xfrm_policy_lock); |
ea2dea9d | 753 | cnt++; |
1da177e4 | 754 | |
ab5f5e8b | 755 | xfrm_audit_policy_delete(pol, 1, audit_info->loginuid, |
2532386f | 756 | audit_info->sessionid, |
ab5f5e8b | 757 | audit_info->secid); |
161a09e7 | 758 | |
2518c7c2 | 759 | xfrm_policy_kill(pol); |
1da177e4 LT |
760 | |
761 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
762 | goto again1; |
763 | } | |
764 | ||
33ffbbd5 | 765 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { |
2518c7c2 DM |
766 | again2: |
767 | hlist_for_each_entry(pol, entry, | |
33ffbbd5 | 768 | net->xfrm.policy_bydst[dir].table + i, |
2518c7c2 DM |
769 | bydst) { |
770 | if (pol->type != type) | |
771 | continue; | |
ea2dea9d | 772 | __xfrm_policy_unlink(pol, dir); |
2518c7c2 | 773 | write_unlock_bh(&xfrm_policy_lock); |
ea2dea9d | 774 | cnt++; |
2518c7c2 | 775 | |
ab5f5e8b JL |
776 | xfrm_audit_policy_delete(pol, 1, |
777 | audit_info->loginuid, | |
2532386f | 778 | audit_info->sessionid, |
ab5f5e8b | 779 | audit_info->secid); |
2518c7c2 DM |
780 | xfrm_policy_kill(pol); |
781 | ||
782 | write_lock_bh(&xfrm_policy_lock); | |
783 | goto again2; | |
784 | } | |
1da177e4 | 785 | } |
2518c7c2 | 786 | |
1da177e4 | 787 | } |
2f1eb65f JHS |
788 | if (!cnt) |
789 | err = -ESRCH; | |
4aa2e62c | 790 | out: |
1da177e4 | 791 | write_unlock_bh(&xfrm_policy_lock); |
4aa2e62c | 792 | return err; |
1da177e4 LT |
793 | } |
794 | EXPORT_SYMBOL(xfrm_policy_flush); | |
795 | ||
cdcbca7c | 796 | int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, |
4c563f76 | 797 | int (*func)(struct xfrm_policy *, int, int, void*), |
1da177e4 LT |
798 | void *data) |
799 | { | |
12a169e7 HX |
800 | struct xfrm_policy *pol; |
801 | struct xfrm_policy_walk_entry *x; | |
4c563f76 TT |
802 | int error = 0; |
803 | ||
804 | if (walk->type >= XFRM_POLICY_TYPE_MAX && | |
805 | walk->type != XFRM_POLICY_TYPE_ANY) | |
806 | return -EINVAL; | |
1da177e4 | 807 | |
12a169e7 | 808 | if (list_empty(&walk->walk.all) && walk->seq != 0) |
4c563f76 TT |
809 | return 0; |
810 | ||
12a169e7 HX |
811 | write_lock_bh(&xfrm_policy_lock); |
812 | if (list_empty(&walk->walk.all)) | |
cdcbca7c | 813 | x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all); |
12a169e7 HX |
814 | else |
815 | x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all); | |
cdcbca7c | 816 | list_for_each_entry_from(x, &net->xfrm.policy_all, all) { |
12a169e7 | 817 | if (x->dead) |
4c563f76 | 818 | continue; |
12a169e7 HX |
819 | pol = container_of(x, struct xfrm_policy, walk); |
820 | if (walk->type != XFRM_POLICY_TYPE_ANY && | |
821 | walk->type != pol->type) | |
822 | continue; | |
823 | error = func(pol, xfrm_policy_id2dir(pol->index), | |
824 | walk->seq, data); | |
825 | if (error) { | |
826 | list_move_tail(&walk->walk.all, &x->all); | |
827 | goto out; | |
2518c7c2 | 828 | } |
12a169e7 | 829 | walk->seq++; |
1da177e4 | 830 | } |
12a169e7 | 831 | if (walk->seq == 0) { |
baf5d743 JHS |
832 | error = -ENOENT; |
833 | goto out; | |
834 | } | |
12a169e7 | 835 | list_del_init(&walk->walk.all); |
1da177e4 | 836 | out: |
12a169e7 | 837 | write_unlock_bh(&xfrm_policy_lock); |
1da177e4 LT |
838 | return error; |
839 | } | |
840 | EXPORT_SYMBOL(xfrm_policy_walk); | |
841 | ||
12a169e7 HX |
842 | void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type) |
843 | { | |
844 | INIT_LIST_HEAD(&walk->walk.all); | |
845 | walk->walk.dead = 1; | |
846 | walk->type = type; | |
847 | walk->seq = 0; | |
848 | } | |
849 | EXPORT_SYMBOL(xfrm_policy_walk_init); | |
850 | ||
851 | void xfrm_policy_walk_done(struct xfrm_policy_walk *walk) | |
852 | { | |
853 | if (list_empty(&walk->walk.all)) | |
854 | return; | |
855 | ||
856 | write_lock_bh(&xfrm_policy_lock); | |
857 | list_del(&walk->walk.all); | |
858 | write_unlock_bh(&xfrm_policy_lock); | |
859 | } | |
860 | EXPORT_SYMBOL(xfrm_policy_walk_done); | |
861 | ||
134b0fc5 JM |
862 | /* |
863 | * Find policy to apply to this flow. | |
864 | * | |
865 | * Returns 0 if policy found, else an -errno. | |
866 | */ | |
2518c7c2 DM |
867 | static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl, |
868 | u8 type, u16 family, int dir) | |
1da177e4 | 869 | { |
2518c7c2 | 870 | struct xfrm_selector *sel = &pol->selector; |
134b0fc5 | 871 | int match, ret = -ESRCH; |
1da177e4 | 872 | |
2518c7c2 | 873 | if (pol->family != family || |
34f8d884 | 874 | (fl->mark & pol->mark.m) != pol->mark.v || |
2518c7c2 | 875 | pol->type != type) |
134b0fc5 | 876 | return ret; |
1da177e4 | 877 | |
2518c7c2 | 878 | match = xfrm_selector_match(sel, fl, family); |
134b0fc5 | 879 | if (match) |
03e1ad7b PM |
880 | ret = security_xfrm_policy_lookup(pol->security, fl->secid, |
881 | dir); | |
2518c7c2 | 882 | |
134b0fc5 | 883 | return ret; |
2518c7c2 | 884 | } |
1da177e4 | 885 | |
52479b62 AD |
886 | static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type, |
887 | struct flowi *fl, | |
2518c7c2 DM |
888 | u16 family, u8 dir) |
889 | { | |
134b0fc5 | 890 | int err; |
2518c7c2 DM |
891 | struct xfrm_policy *pol, *ret; |
892 | xfrm_address_t *daddr, *saddr; | |
893 | struct hlist_node *entry; | |
894 | struct hlist_head *chain; | |
acba48e1 | 895 | u32 priority = ~0U; |
df71837d | 896 | |
2518c7c2 DM |
897 | daddr = xfrm_flowi_daddr(fl, family); |
898 | saddr = xfrm_flowi_saddr(fl, family); | |
899 | if (unlikely(!daddr || !saddr)) | |
900 | return NULL; | |
901 | ||
902 | read_lock_bh(&xfrm_policy_lock); | |
52479b62 | 903 | chain = policy_hash_direct(net, daddr, saddr, family, dir); |
2518c7c2 DM |
904 | ret = NULL; |
905 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
906 | err = xfrm_policy_match(pol, fl, type, family, dir); |
907 | if (err) { | |
908 | if (err == -ESRCH) | |
909 | continue; | |
910 | else { | |
911 | ret = ERR_PTR(err); | |
912 | goto fail; | |
913 | } | |
914 | } else { | |
2518c7c2 | 915 | ret = pol; |
acba48e1 | 916 | priority = ret->priority; |
2518c7c2 DM |
917 | break; |
918 | } | |
919 | } | |
52479b62 | 920 | chain = &net->xfrm.policy_inexact[dir]; |
acba48e1 | 921 | hlist_for_each_entry(pol, entry, chain, bydst) { |
134b0fc5 JM |
922 | err = xfrm_policy_match(pol, fl, type, family, dir); |
923 | if (err) { | |
924 | if (err == -ESRCH) | |
925 | continue; | |
926 | else { | |
927 | ret = ERR_PTR(err); | |
928 | goto fail; | |
929 | } | |
930 | } else if (pol->priority < priority) { | |
acba48e1 DM |
931 | ret = pol; |
932 | break; | |
1da177e4 LT |
933 | } |
934 | } | |
acba48e1 DM |
935 | if (ret) |
936 | xfrm_pol_hold(ret); | |
134b0fc5 | 937 | fail: |
1da177e4 | 938 | read_unlock_bh(&xfrm_policy_lock); |
4e81bb83 | 939 | |
2518c7c2 | 940 | return ret; |
4e81bb83 MN |
941 | } |
942 | ||
80c802f3 TT |
943 | static struct xfrm_policy * |
944 | __xfrm_policy_lookup(struct net *net, struct flowi *fl, u16 family, u8 dir) | |
945 | { | |
946 | #ifdef CONFIG_XFRM_SUB_POLICY | |
947 | struct xfrm_policy *pol; | |
948 | ||
949 | pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir); | |
950 | if (pol != NULL) | |
951 | return pol; | |
952 | #endif | |
953 | return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir); | |
954 | } | |
955 | ||
fe1a5f03 TT |
956 | static struct flow_cache_object * |
957 | xfrm_policy_lookup(struct net *net, struct flowi *fl, u16 family, | |
958 | u8 dir, struct flow_cache_object *old_obj, void *ctx) | |
4e81bb83 MN |
959 | { |
960 | struct xfrm_policy *pol; | |
fe1a5f03 TT |
961 | |
962 | if (old_obj) | |
963 | xfrm_pol_put(container_of(old_obj, struct xfrm_policy, flo)); | |
4e81bb83 | 964 | |
80c802f3 TT |
965 | pol = __xfrm_policy_lookup(net, fl, family, dir); |
966 | if (IS_ERR_OR_NULL(pol)) | |
fe1a5f03 | 967 | return ERR_CAST(pol); |
fe1a5f03 | 968 | |
fe1a5f03 TT |
969 | /* Resolver returns two references: |
970 | * one for cache and one for caller of flow_cache_lookup() */ | |
971 | xfrm_pol_hold(pol); | |
972 | ||
973 | return &pol->flo; | |
1da177e4 LT |
974 | } |
975 | ||
df71837d TJ |
976 | static inline int policy_to_flow_dir(int dir) |
977 | { | |
978 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
a716c119 YH |
979 | XFRM_POLICY_OUT == FLOW_DIR_OUT && |
980 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
981 | return dir; | |
982 | switch (dir) { | |
983 | default: | |
984 | case XFRM_POLICY_IN: | |
985 | return FLOW_DIR_IN; | |
986 | case XFRM_POLICY_OUT: | |
987 | return FLOW_DIR_OUT; | |
988 | case XFRM_POLICY_FWD: | |
989 | return FLOW_DIR_FWD; | |
3ff50b79 | 990 | } |
df71837d TJ |
991 | } |
992 | ||
e0d1caa7 | 993 | static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl) |
1da177e4 LT |
994 | { |
995 | struct xfrm_policy *pol; | |
996 | ||
997 | read_lock_bh(&xfrm_policy_lock); | |
998 | if ((pol = sk->sk_policy[dir]) != NULL) { | |
a716c119 | 999 | int match = xfrm_selector_match(&pol->selector, fl, |
1da177e4 | 1000 | sk->sk_family); |
a716c119 | 1001 | int err = 0; |
df71837d | 1002 | |
3bccfbc7 | 1003 | if (match) { |
34f8d884 JHS |
1004 | if ((sk->sk_mark & pol->mark.m) != pol->mark.v) { |
1005 | pol = NULL; | |
1006 | goto out; | |
1007 | } | |
03e1ad7b PM |
1008 | err = security_xfrm_policy_lookup(pol->security, |
1009 | fl->secid, | |
1010 | policy_to_flow_dir(dir)); | |
3bccfbc7 VY |
1011 | if (!err) |
1012 | xfrm_pol_hold(pol); | |
1013 | else if (err == -ESRCH) | |
1014 | pol = NULL; | |
1015 | else | |
1016 | pol = ERR_PTR(err); | |
1017 | } else | |
1da177e4 LT |
1018 | pol = NULL; |
1019 | } | |
34f8d884 | 1020 | out: |
1da177e4 LT |
1021 | read_unlock_bh(&xfrm_policy_lock); |
1022 | return pol; | |
1023 | } | |
1024 | ||
1025 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) | |
1026 | { | |
98806f75 | 1027 | struct net *net = xp_net(pol); |
1121994c | 1028 | struct hlist_head *chain = policy_hash_bysel(net, &pol->selector, |
2518c7c2 | 1029 | pol->family, dir); |
4e81bb83 | 1030 | |
98806f75 | 1031 | list_add(&pol->walk.all, &net->xfrm.policy_all); |
2518c7c2 | 1032 | hlist_add_head(&pol->bydst, chain); |
e92303f8 | 1033 | hlist_add_head(&pol->byidx, net->xfrm.policy_byidx+idx_hash(net, pol->index)); |
98806f75 | 1034 | net->xfrm.policy_count[dir]++; |
1da177e4 | 1035 | xfrm_pol_hold(pol); |
2518c7c2 | 1036 | |
98806f75 AD |
1037 | if (xfrm_bydst_should_resize(net, dir, NULL)) |
1038 | schedule_work(&net->xfrm.policy_hash_work); | |
1da177e4 LT |
1039 | } |
1040 | ||
1041 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, | |
1042 | int dir) | |
1043 | { | |
98806f75 AD |
1044 | struct net *net = xp_net(pol); |
1045 | ||
2518c7c2 DM |
1046 | if (hlist_unhashed(&pol->bydst)) |
1047 | return NULL; | |
1da177e4 | 1048 | |
2518c7c2 DM |
1049 | hlist_del(&pol->bydst); |
1050 | hlist_del(&pol->byidx); | |
12a169e7 | 1051 | list_del(&pol->walk.all); |
98806f75 | 1052 | net->xfrm.policy_count[dir]--; |
2518c7c2 DM |
1053 | |
1054 | return pol; | |
1da177e4 LT |
1055 | } |
1056 | ||
4666faab | 1057 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir) |
1da177e4 LT |
1058 | { |
1059 | write_lock_bh(&xfrm_policy_lock); | |
1060 | pol = __xfrm_policy_unlink(pol, dir); | |
1061 | write_unlock_bh(&xfrm_policy_lock); | |
1062 | if (pol) { | |
1da177e4 | 1063 | xfrm_policy_kill(pol); |
4666faab | 1064 | return 0; |
1da177e4 | 1065 | } |
4666faab | 1066 | return -ENOENT; |
1da177e4 | 1067 | } |
a70fcb0b | 1068 | EXPORT_SYMBOL(xfrm_policy_delete); |
1da177e4 LT |
1069 | |
1070 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) | |
1071 | { | |
1121994c | 1072 | struct net *net = xp_net(pol); |
1da177e4 LT |
1073 | struct xfrm_policy *old_pol; |
1074 | ||
4e81bb83 MN |
1075 | #ifdef CONFIG_XFRM_SUB_POLICY |
1076 | if (pol && pol->type != XFRM_POLICY_TYPE_MAIN) | |
1077 | return -EINVAL; | |
1078 | #endif | |
1079 | ||
1da177e4 LT |
1080 | write_lock_bh(&xfrm_policy_lock); |
1081 | old_pol = sk->sk_policy[dir]; | |
1082 | sk->sk_policy[dir] = pol; | |
1083 | if (pol) { | |
9d729f72 | 1084 | pol->curlft.add_time = get_seconds(); |
1121994c | 1085 | pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir); |
1da177e4 LT |
1086 | __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir); |
1087 | } | |
1088 | if (old_pol) | |
ea2dea9d TT |
1089 | /* Unlinking succeeds always. This is the only function |
1090 | * allowed to delete or replace socket policy. | |
1091 | */ | |
1da177e4 LT |
1092 | __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir); |
1093 | write_unlock_bh(&xfrm_policy_lock); | |
1094 | ||
1095 | if (old_pol) { | |
1096 | xfrm_policy_kill(old_pol); | |
1097 | } | |
1098 | return 0; | |
1099 | } | |
1100 | ||
1101 | static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir) | |
1102 | { | |
0331b1f3 | 1103 | struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC); |
1da177e4 LT |
1104 | |
1105 | if (newp) { | |
1106 | newp->selector = old->selector; | |
03e1ad7b PM |
1107 | if (security_xfrm_policy_clone(old->security, |
1108 | &newp->security)) { | |
df71837d TJ |
1109 | kfree(newp); |
1110 | return NULL; /* ENOMEM */ | |
1111 | } | |
1da177e4 LT |
1112 | newp->lft = old->lft; |
1113 | newp->curlft = old->curlft; | |
fb977e2c | 1114 | newp->mark = old->mark; |
1da177e4 LT |
1115 | newp->action = old->action; |
1116 | newp->flags = old->flags; | |
1117 | newp->xfrm_nr = old->xfrm_nr; | |
1118 | newp->index = old->index; | |
4e81bb83 | 1119 | newp->type = old->type; |
1da177e4 LT |
1120 | memcpy(newp->xfrm_vec, old->xfrm_vec, |
1121 | newp->xfrm_nr*sizeof(struct xfrm_tmpl)); | |
1122 | write_lock_bh(&xfrm_policy_lock); | |
1123 | __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir); | |
1124 | write_unlock_bh(&xfrm_policy_lock); | |
1125 | xfrm_pol_put(newp); | |
1126 | } | |
1127 | return newp; | |
1128 | } | |
1129 | ||
1130 | int __xfrm_sk_clone_policy(struct sock *sk) | |
1131 | { | |
1132 | struct xfrm_policy *p0 = sk->sk_policy[0], | |
1133 | *p1 = sk->sk_policy[1]; | |
1134 | ||
1135 | sk->sk_policy[0] = sk->sk_policy[1] = NULL; | |
1136 | if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL) | |
1137 | return -ENOMEM; | |
1138 | if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL) | |
1139 | return -ENOMEM; | |
1140 | return 0; | |
1141 | } | |
1142 | ||
a1e59abf | 1143 | static int |
fbda33b2 | 1144 | xfrm_get_saddr(struct net *net, xfrm_address_t *local, xfrm_address_t *remote, |
a1e59abf PM |
1145 | unsigned short family) |
1146 | { | |
1147 | int err; | |
1148 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1149 | ||
1150 | if (unlikely(afinfo == NULL)) | |
1151 | return -EINVAL; | |
fbda33b2 | 1152 | err = afinfo->get_saddr(net, local, remote); |
a1e59abf PM |
1153 | xfrm_policy_put_afinfo(afinfo); |
1154 | return err; | |
1155 | } | |
1156 | ||
1da177e4 LT |
1157 | /* Resolve list of templates for the flow, given policy. */ |
1158 | ||
1159 | static int | |
4e81bb83 MN |
1160 | xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl, |
1161 | struct xfrm_state **xfrm, | |
1162 | unsigned short family) | |
1da177e4 | 1163 | { |
fbda33b2 | 1164 | struct net *net = xp_net(policy); |
1da177e4 LT |
1165 | int nx; |
1166 | int i, error; | |
1167 | xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); | |
1168 | xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); | |
a1e59abf | 1169 | xfrm_address_t tmp; |
1da177e4 LT |
1170 | |
1171 | for (nx=0, i = 0; i < policy->xfrm_nr; i++) { | |
1172 | struct xfrm_state *x; | |
1173 | xfrm_address_t *remote = daddr; | |
1174 | xfrm_address_t *local = saddr; | |
1175 | struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; | |
1176 | ||
48b8d783 JK |
1177 | if (tmpl->mode == XFRM_MODE_TUNNEL || |
1178 | tmpl->mode == XFRM_MODE_BEET) { | |
1da177e4 LT |
1179 | remote = &tmpl->id.daddr; |
1180 | local = &tmpl->saddr; | |
8444cf71 TE |
1181 | if (xfrm_addr_any(local, tmpl->encap_family)) { |
1182 | error = xfrm_get_saddr(net, &tmp, remote, tmpl->encap_family); | |
a1e59abf PM |
1183 | if (error) |
1184 | goto fail; | |
1185 | local = &tmp; | |
1186 | } | |
1da177e4 LT |
1187 | } |
1188 | ||
1189 | x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); | |
1190 | ||
1191 | if (x && x->km.state == XFRM_STATE_VALID) { | |
1192 | xfrm[nx++] = x; | |
1193 | daddr = remote; | |
1194 | saddr = local; | |
1195 | continue; | |
1196 | } | |
1197 | if (x) { | |
1198 | error = (x->km.state == XFRM_STATE_ERROR ? | |
1199 | -EINVAL : -EAGAIN); | |
1200 | xfrm_state_put(x); | |
1201 | } | |
a4322266 | 1202 | else if (error == -ESRCH) |
1203 | error = -EAGAIN; | |
1da177e4 LT |
1204 | |
1205 | if (!tmpl->optional) | |
1206 | goto fail; | |
1207 | } | |
1208 | return nx; | |
1209 | ||
1210 | fail: | |
1211 | for (nx--; nx>=0; nx--) | |
1212 | xfrm_state_put(xfrm[nx]); | |
1213 | return error; | |
1214 | } | |
1215 | ||
4e81bb83 MN |
1216 | static int |
1217 | xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl, | |
1218 | struct xfrm_state **xfrm, | |
1219 | unsigned short family) | |
1220 | { | |
41a49cc3 MN |
1221 | struct xfrm_state *tp[XFRM_MAX_DEPTH]; |
1222 | struct xfrm_state **tpp = (npols > 1) ? tp : xfrm; | |
4e81bb83 MN |
1223 | int cnx = 0; |
1224 | int error; | |
1225 | int ret; | |
1226 | int i; | |
1227 | ||
1228 | for (i = 0; i < npols; i++) { | |
1229 | if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
1230 | error = -ENOBUFS; | |
1231 | goto fail; | |
1232 | } | |
41a49cc3 MN |
1233 | |
1234 | ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family); | |
4e81bb83 MN |
1235 | if (ret < 0) { |
1236 | error = ret; | |
1237 | goto fail; | |
1238 | } else | |
1239 | cnx += ret; | |
1240 | } | |
1241 | ||
41a49cc3 MN |
1242 | /* found states are sorted for outbound processing */ |
1243 | if (npols > 1) | |
1244 | xfrm_state_sort(xfrm, tpp, cnx, family); | |
1245 | ||
4e81bb83 MN |
1246 | return cnx; |
1247 | ||
1248 | fail: | |
1249 | for (cnx--; cnx>=0; cnx--) | |
41a49cc3 | 1250 | xfrm_state_put(tpp[cnx]); |
4e81bb83 MN |
1251 | return error; |
1252 | ||
1253 | } | |
1254 | ||
1da177e4 LT |
1255 | /* Check that the bundle accepts the flow and its components are |
1256 | * still valid. | |
1257 | */ | |
1258 | ||
05d84025 | 1259 | static inline int xfrm_get_tos(const struct flowi *fl, int family) |
25ee3286 HX |
1260 | { |
1261 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1262 | int tos; | |
1da177e4 | 1263 | |
25ee3286 HX |
1264 | if (!afinfo) |
1265 | return -EINVAL; | |
1266 | ||
1267 | tos = afinfo->get_tos(fl); | |
1268 | ||
1269 | xfrm_policy_put_afinfo(afinfo); | |
1270 | ||
1271 | return tos; | |
1272 | } | |
1273 | ||
80c802f3 TT |
1274 | static struct flow_cache_object *xfrm_bundle_flo_get(struct flow_cache_object *flo) |
1275 | { | |
1276 | struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); | |
1277 | struct dst_entry *dst = &xdst->u.dst; | |
1278 | ||
1279 | if (xdst->route == NULL) { | |
1280 | /* Dummy bundle - if it has xfrms we were not | |
1281 | * able to build bundle as template resolution failed. | |
1282 | * It means we need to try again resolving. */ | |
1283 | if (xdst->num_xfrms > 0) | |
1284 | return NULL; | |
1285 | } else { | |
1286 | /* Real bundle */ | |
1287 | if (stale_bundle(dst)) | |
1288 | return NULL; | |
1289 | } | |
1290 | ||
1291 | dst_hold(dst); | |
1292 | return flo; | |
1293 | } | |
1294 | ||
1295 | static int xfrm_bundle_flo_check(struct flow_cache_object *flo) | |
1296 | { | |
1297 | struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); | |
1298 | struct dst_entry *dst = &xdst->u.dst; | |
1299 | ||
1300 | if (!xdst->route) | |
1301 | return 0; | |
1302 | if (stale_bundle(dst)) | |
1303 | return 0; | |
1304 | ||
1305 | return 1; | |
1306 | } | |
1307 | ||
1308 | static void xfrm_bundle_flo_delete(struct flow_cache_object *flo) | |
1309 | { | |
1310 | struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); | |
1311 | struct dst_entry *dst = &xdst->u.dst; | |
1312 | ||
1313 | dst_free(dst); | |
1314 | } | |
1315 | ||
1316 | static const struct flow_cache_ops xfrm_bundle_fc_ops = { | |
1317 | .get = xfrm_bundle_flo_get, | |
1318 | .check = xfrm_bundle_flo_check, | |
1319 | .delete = xfrm_bundle_flo_delete, | |
1320 | }; | |
1321 | ||
d7c7544c | 1322 | static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family) |
1da177e4 | 1323 | { |
1da177e4 | 1324 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
d7c7544c | 1325 | struct dst_ops *dst_ops; |
25ee3286 HX |
1326 | struct xfrm_dst *xdst; |
1327 | ||
1328 | if (!afinfo) | |
1329 | return ERR_PTR(-EINVAL); | |
1330 | ||
d7c7544c AD |
1331 | switch (family) { |
1332 | case AF_INET: | |
1333 | dst_ops = &net->xfrm.xfrm4_dst_ops; | |
1334 | break; | |
1335 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
1336 | case AF_INET6: | |
1337 | dst_ops = &net->xfrm.xfrm6_dst_ops; | |
1338 | break; | |
1339 | #endif | |
1340 | default: | |
1341 | BUG(); | |
1342 | } | |
da935c66 | 1343 | xdst = dst_alloc(dst_ops, 0); |
25ee3286 HX |
1344 | xfrm_policy_put_afinfo(afinfo); |
1345 | ||
0b150932 HS |
1346 | if (likely(xdst)) |
1347 | xdst->flo.ops = &xfrm_bundle_fc_ops; | |
1348 | else | |
1349 | xdst = ERR_PTR(-ENOBUFS); | |
80c802f3 | 1350 | |
25ee3286 HX |
1351 | return xdst; |
1352 | } | |
1353 | ||
a1b05140 MN |
1354 | static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst, |
1355 | int nfheader_len) | |
1356 | { | |
1357 | struct xfrm_policy_afinfo *afinfo = | |
1358 | xfrm_policy_get_afinfo(dst->ops->family); | |
1359 | int err; | |
1360 | ||
1361 | if (!afinfo) | |
1362 | return -EINVAL; | |
1363 | ||
1364 | err = afinfo->init_path(path, dst, nfheader_len); | |
1365 | ||
1366 | xfrm_policy_put_afinfo(afinfo); | |
1367 | ||
1368 | return err; | |
1369 | } | |
1370 | ||
87c1e12b | 1371 | static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev, |
0c7b3eef | 1372 | const struct flowi *fl) |
25ee3286 HX |
1373 | { |
1374 | struct xfrm_policy_afinfo *afinfo = | |
1375 | xfrm_policy_get_afinfo(xdst->u.dst.ops->family); | |
1376 | int err; | |
1377 | ||
1378 | if (!afinfo) | |
1da177e4 | 1379 | return -EINVAL; |
25ee3286 | 1380 | |
87c1e12b | 1381 | err = afinfo->fill_dst(xdst, dev, fl); |
25ee3286 | 1382 | |
1da177e4 | 1383 | xfrm_policy_put_afinfo(afinfo); |
25ee3286 | 1384 | |
1da177e4 LT |
1385 | return err; |
1386 | } | |
1387 | ||
80c802f3 | 1388 | |
25ee3286 HX |
1389 | /* Allocate chain of dst_entry's, attach known xfrm's, calculate |
1390 | * all the metrics... Shortly, bundle a bundle. | |
1391 | */ | |
1392 | ||
1393 | static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy, | |
1394 | struct xfrm_state **xfrm, int nx, | |
1395 | struct flowi *fl, | |
1396 | struct dst_entry *dst) | |
1397 | { | |
d7c7544c | 1398 | struct net *net = xp_net(policy); |
25ee3286 HX |
1399 | unsigned long now = jiffies; |
1400 | struct net_device *dev; | |
1401 | struct dst_entry *dst_prev = NULL; | |
1402 | struct dst_entry *dst0 = NULL; | |
1403 | int i = 0; | |
1404 | int err; | |
1405 | int header_len = 0; | |
a1b05140 | 1406 | int nfheader_len = 0; |
25ee3286 HX |
1407 | int trailer_len = 0; |
1408 | int tos; | |
1409 | int family = policy->selector.family; | |
9bb182a7 YH |
1410 | xfrm_address_t saddr, daddr; |
1411 | ||
1412 | xfrm_flowi_addr_get(fl, &saddr, &daddr, family); | |
25ee3286 HX |
1413 | |
1414 | tos = xfrm_get_tos(fl, family); | |
1415 | err = tos; | |
1416 | if (tos < 0) | |
1417 | goto put_states; | |
1418 | ||
1419 | dst_hold(dst); | |
1420 | ||
1421 | for (; i < nx; i++) { | |
d7c7544c | 1422 | struct xfrm_dst *xdst = xfrm_alloc_dst(net, family); |
25ee3286 HX |
1423 | struct dst_entry *dst1 = &xdst->u.dst; |
1424 | ||
1425 | err = PTR_ERR(xdst); | |
1426 | if (IS_ERR(xdst)) { | |
1427 | dst_release(dst); | |
1428 | goto put_states; | |
1429 | } | |
1430 | ||
1431 | if (!dst_prev) | |
1432 | dst0 = dst1; | |
1433 | else { | |
1434 | dst_prev->child = dst_clone(dst1); | |
1435 | dst1->flags |= DST_NOHASH; | |
1436 | } | |
1437 | ||
1438 | xdst->route = dst; | |
defb3519 | 1439 | dst_copy_metrics(dst1, dst); |
25ee3286 HX |
1440 | |
1441 | if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) { | |
1442 | family = xfrm[i]->props.family; | |
9bb182a7 YH |
1443 | dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr, |
1444 | family); | |
25ee3286 HX |
1445 | err = PTR_ERR(dst); |
1446 | if (IS_ERR(dst)) | |
1447 | goto put_states; | |
1448 | } else | |
1449 | dst_hold(dst); | |
1450 | ||
1451 | dst1->xfrm = xfrm[i]; | |
80c802f3 | 1452 | xdst->xfrm_genid = xfrm[i]->genid; |
25ee3286 HX |
1453 | |
1454 | dst1->obsolete = -1; | |
1455 | dst1->flags |= DST_HOST; | |
1456 | dst1->lastuse = now; | |
1457 | ||
1458 | dst1->input = dst_discard; | |
1459 | dst1->output = xfrm[i]->outer_mode->afinfo->output; | |
1460 | ||
1461 | dst1->next = dst_prev; | |
1462 | dst_prev = dst1; | |
1463 | ||
1464 | header_len += xfrm[i]->props.header_len; | |
a1b05140 MN |
1465 | if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT) |
1466 | nfheader_len += xfrm[i]->props.header_len; | |
25ee3286 HX |
1467 | trailer_len += xfrm[i]->props.trailer_len; |
1468 | } | |
1469 | ||
1470 | dst_prev->child = dst; | |
1471 | dst0->path = dst; | |
1472 | ||
1473 | err = -ENODEV; | |
1474 | dev = dst->dev; | |
1475 | if (!dev) | |
1476 | goto free_dst; | |
1477 | ||
96c53401 | 1478 | /* Copy neighbour for reachability confirmation */ |
25ee3286 HX |
1479 | dst0->neighbour = neigh_clone(dst->neighbour); |
1480 | ||
a1b05140 | 1481 | xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len); |
25ee3286 HX |
1482 | xfrm_init_pmtu(dst_prev); |
1483 | ||
1484 | for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) { | |
1485 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev; | |
1486 | ||
87c1e12b | 1487 | err = xfrm_fill_dst(xdst, dev, fl); |
25ee3286 HX |
1488 | if (err) |
1489 | goto free_dst; | |
1490 | ||
1491 | dst_prev->header_len = header_len; | |
1492 | dst_prev->trailer_len = trailer_len; | |
1493 | header_len -= xdst->u.dst.xfrm->props.header_len; | |
1494 | trailer_len -= xdst->u.dst.xfrm->props.trailer_len; | |
1495 | } | |
1496 | ||
1497 | out: | |
1498 | return dst0; | |
1499 | ||
1500 | put_states: | |
1501 | for (; i < nx; i++) | |
1502 | xfrm_state_put(xfrm[i]); | |
1503 | free_dst: | |
1504 | if (dst0) | |
1505 | dst_free(dst0); | |
1506 | dst0 = ERR_PTR(err); | |
1507 | goto out; | |
1508 | } | |
1509 | ||
157bfc25 MN |
1510 | static int inline |
1511 | xfrm_dst_alloc_copy(void **target, void *src, int size) | |
1512 | { | |
1513 | if (!*target) { | |
1514 | *target = kmalloc(size, GFP_ATOMIC); | |
1515 | if (!*target) | |
1516 | return -ENOMEM; | |
1517 | } | |
1518 | memcpy(*target, src, size); | |
1519 | return 0; | |
1520 | } | |
1521 | ||
1522 | static int inline | |
1523 | xfrm_dst_update_parent(struct dst_entry *dst, struct xfrm_selector *sel) | |
1524 | { | |
1525 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1526 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1527 | return xfrm_dst_alloc_copy((void **)&(xdst->partner), | |
1528 | sel, sizeof(*sel)); | |
1529 | #else | |
1530 | return 0; | |
1531 | #endif | |
1532 | } | |
1533 | ||
1534 | static int inline | |
1535 | xfrm_dst_update_origin(struct dst_entry *dst, struct flowi *fl) | |
1536 | { | |
1537 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1538 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1539 | return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl)); | |
1540 | #else | |
1541 | return 0; | |
1542 | #endif | |
1543 | } | |
1da177e4 | 1544 | |
80c802f3 TT |
1545 | static int xfrm_expand_policies(struct flowi *fl, u16 family, |
1546 | struct xfrm_policy **pols, | |
1547 | int *num_pols, int *num_xfrms) | |
1548 | { | |
1549 | int i; | |
1550 | ||
1551 | if (*num_pols == 0 || !pols[0]) { | |
1552 | *num_pols = 0; | |
1553 | *num_xfrms = 0; | |
1554 | return 0; | |
1555 | } | |
1556 | if (IS_ERR(pols[0])) | |
1557 | return PTR_ERR(pols[0]); | |
1558 | ||
1559 | *num_xfrms = pols[0]->xfrm_nr; | |
1560 | ||
1561 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1562 | if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW && | |
1563 | pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1564 | pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]), | |
1565 | XFRM_POLICY_TYPE_MAIN, | |
1566 | fl, family, | |
1567 | XFRM_POLICY_OUT); | |
1568 | if (pols[1]) { | |
1569 | if (IS_ERR(pols[1])) { | |
1570 | xfrm_pols_put(pols, *num_pols); | |
1571 | return PTR_ERR(pols[1]); | |
1572 | } | |
1573 | (*num_pols) ++; | |
1574 | (*num_xfrms) += pols[1]->xfrm_nr; | |
1575 | } | |
1576 | } | |
1577 | #endif | |
1578 | for (i = 0; i < *num_pols; i++) { | |
1579 | if (pols[i]->action != XFRM_POLICY_ALLOW) { | |
1580 | *num_xfrms = -1; | |
1581 | break; | |
1582 | } | |
1583 | } | |
1584 | ||
1585 | return 0; | |
1586 | ||
1587 | } | |
1588 | ||
1589 | static struct xfrm_dst * | |
1590 | xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols, | |
1591 | struct flowi *fl, u16 family, | |
1592 | struct dst_entry *dst_orig) | |
1593 | { | |
1594 | struct net *net = xp_net(pols[0]); | |
1595 | struct xfrm_state *xfrm[XFRM_MAX_DEPTH]; | |
1596 | struct dst_entry *dst; | |
1597 | struct xfrm_dst *xdst; | |
1598 | int err; | |
1599 | ||
1600 | /* Try to instantiate a bundle */ | |
1601 | err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family); | |
d809ec89 TT |
1602 | if (err <= 0) { |
1603 | if (err != 0 && err != -EAGAIN) | |
80c802f3 TT |
1604 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); |
1605 | return ERR_PTR(err); | |
1606 | } | |
1607 | ||
1608 | dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig); | |
1609 | if (IS_ERR(dst)) { | |
1610 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR); | |
1611 | return ERR_CAST(dst); | |
1612 | } | |
1613 | ||
1614 | xdst = (struct xfrm_dst *)dst; | |
1615 | xdst->num_xfrms = err; | |
1616 | if (num_pols > 1) | |
1617 | err = xfrm_dst_update_parent(dst, &pols[1]->selector); | |
1618 | else | |
1619 | err = xfrm_dst_update_origin(dst, fl); | |
1620 | if (unlikely(err)) { | |
1621 | dst_free(dst); | |
1622 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR); | |
1623 | return ERR_PTR(err); | |
1624 | } | |
1625 | ||
1626 | xdst->num_pols = num_pols; | |
1627 | memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols); | |
1628 | xdst->policy_genid = atomic_read(&pols[0]->genid); | |
1629 | ||
1630 | return xdst; | |
1631 | } | |
1632 | ||
1633 | static struct flow_cache_object * | |
1634 | xfrm_bundle_lookup(struct net *net, struct flowi *fl, u16 family, u8 dir, | |
1635 | struct flow_cache_object *oldflo, void *ctx) | |
1636 | { | |
1637 | struct dst_entry *dst_orig = (struct dst_entry *)ctx; | |
1638 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; | |
1639 | struct xfrm_dst *xdst, *new_xdst; | |
1640 | int num_pols = 0, num_xfrms = 0, i, err, pol_dead; | |
1641 | ||
1642 | /* Check if the policies from old bundle are usable */ | |
1643 | xdst = NULL; | |
1644 | if (oldflo) { | |
1645 | xdst = container_of(oldflo, struct xfrm_dst, flo); | |
1646 | num_pols = xdst->num_pols; | |
1647 | num_xfrms = xdst->num_xfrms; | |
1648 | pol_dead = 0; | |
1649 | for (i = 0; i < num_pols; i++) { | |
1650 | pols[i] = xdst->pols[i]; | |
1651 | pol_dead |= pols[i]->walk.dead; | |
1652 | } | |
1653 | if (pol_dead) { | |
1654 | dst_free(&xdst->u.dst); | |
1655 | xdst = NULL; | |
1656 | num_pols = 0; | |
1657 | num_xfrms = 0; | |
1658 | oldflo = NULL; | |
1659 | } | |
1660 | } | |
1661 | ||
1662 | /* Resolve policies to use if we couldn't get them from | |
1663 | * previous cache entry */ | |
1664 | if (xdst == NULL) { | |
1665 | num_pols = 1; | |
1666 | pols[0] = __xfrm_policy_lookup(net, fl, family, dir); | |
1667 | err = xfrm_expand_policies(fl, family, pols, | |
1668 | &num_pols, &num_xfrms); | |
1669 | if (err < 0) | |
1670 | goto inc_error; | |
1671 | if (num_pols == 0) | |
1672 | return NULL; | |
1673 | if (num_xfrms <= 0) | |
1674 | goto make_dummy_bundle; | |
1675 | } | |
1676 | ||
1677 | new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family, dst_orig); | |
1678 | if (IS_ERR(new_xdst)) { | |
1679 | err = PTR_ERR(new_xdst); | |
1680 | if (err != -EAGAIN) | |
1681 | goto error; | |
1682 | if (oldflo == NULL) | |
1683 | goto make_dummy_bundle; | |
1684 | dst_hold(&xdst->u.dst); | |
1685 | return oldflo; | |
d809ec89 TT |
1686 | } else if (new_xdst == NULL) { |
1687 | num_xfrms = 0; | |
1688 | if (oldflo == NULL) | |
1689 | goto make_dummy_bundle; | |
1690 | xdst->num_xfrms = 0; | |
1691 | dst_hold(&xdst->u.dst); | |
1692 | return oldflo; | |
80c802f3 TT |
1693 | } |
1694 | ||
1695 | /* Kill the previous bundle */ | |
1696 | if (xdst) { | |
1697 | /* The policies were stolen for newly generated bundle */ | |
1698 | xdst->num_pols = 0; | |
1699 | dst_free(&xdst->u.dst); | |
1700 | } | |
1701 | ||
1702 | /* Flow cache does not have reference, it dst_free()'s, | |
1703 | * but we do need to return one reference for original caller */ | |
1704 | dst_hold(&new_xdst->u.dst); | |
1705 | return &new_xdst->flo; | |
1706 | ||
1707 | make_dummy_bundle: | |
1708 | /* We found policies, but there's no bundles to instantiate: | |
1709 | * either because the policy blocks, has no transformations or | |
1710 | * we could not build template (no xfrm_states).*/ | |
1711 | xdst = xfrm_alloc_dst(net, family); | |
1712 | if (IS_ERR(xdst)) { | |
1713 | xfrm_pols_put(pols, num_pols); | |
1714 | return ERR_CAST(xdst); | |
1715 | } | |
1716 | xdst->num_pols = num_pols; | |
1717 | xdst->num_xfrms = num_xfrms; | |
1718 | memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols); | |
1719 | ||
1720 | dst_hold(&xdst->u.dst); | |
1721 | return &xdst->flo; | |
1722 | ||
1723 | inc_error: | |
1724 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); | |
1725 | error: | |
1726 | if (xdst != NULL) | |
1727 | dst_free(&xdst->u.dst); | |
1728 | else | |
1729 | xfrm_pols_put(pols, num_pols); | |
1730 | return ERR_PTR(err); | |
1731 | } | |
1da177e4 LT |
1732 | |
1733 | /* Main function: finds/creates a bundle for given flow. | |
1734 | * | |
1735 | * At the moment we eat a raw IP route. Mostly to speed up lookups | |
1736 | * on interfaces with disabled IPsec. | |
1737 | */ | |
52479b62 | 1738 | int __xfrm_lookup(struct net *net, struct dst_entry **dst_p, struct flowi *fl, |
14e50e57 | 1739 | struct sock *sk, int flags) |
1da177e4 | 1740 | { |
4e81bb83 | 1741 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
80c802f3 TT |
1742 | struct flow_cache_object *flo; |
1743 | struct xfrm_dst *xdst; | |
1744 | struct dst_entry *dst, *dst_orig = *dst_p, *route; | |
1745 | u16 family = dst_orig->ops->family; | |
df71837d | 1746 | u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT); |
4b021628 | 1747 | int i, err, num_pols, num_xfrms = 0, drop_pols = 0; |
e0d1caa7 | 1748 | |
1da177e4 | 1749 | restart: |
80c802f3 TT |
1750 | dst = NULL; |
1751 | xdst = NULL; | |
1752 | route = NULL; | |
4e81bb83 | 1753 | |
f7944fb1 | 1754 | if (sk && sk->sk_policy[XFRM_POLICY_OUT]) { |
80c802f3 TT |
1755 | num_pols = 1; |
1756 | pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl); | |
1757 | err = xfrm_expand_policies(fl, family, pols, | |
1758 | &num_pols, &num_xfrms); | |
1759 | if (err < 0) | |
75b8c133 | 1760 | goto dropdst; |
80c802f3 TT |
1761 | |
1762 | if (num_pols) { | |
1763 | if (num_xfrms <= 0) { | |
1764 | drop_pols = num_pols; | |
1765 | goto no_transform; | |
1766 | } | |
1767 | ||
1768 | xdst = xfrm_resolve_and_create_bundle( | |
1769 | pols, num_pols, fl, | |
1770 | family, dst_orig); | |
1771 | if (IS_ERR(xdst)) { | |
1772 | xfrm_pols_put(pols, num_pols); | |
1773 | err = PTR_ERR(xdst); | |
1774 | goto dropdst; | |
d809ec89 TT |
1775 | } else if (xdst == NULL) { |
1776 | num_xfrms = 0; | |
1777 | drop_pols = num_pols; | |
1778 | goto no_transform; | |
80c802f3 TT |
1779 | } |
1780 | ||
1781 | spin_lock_bh(&xfrm_policy_sk_bundle_lock); | |
1782 | xdst->u.dst.next = xfrm_policy_sk_bundles; | |
1783 | xfrm_policy_sk_bundles = &xdst->u.dst; | |
1784 | spin_unlock_bh(&xfrm_policy_sk_bundle_lock); | |
1785 | ||
1786 | route = xdst->route; | |
0aa64774 | 1787 | } |
3bccfbc7 | 1788 | } |
1da177e4 | 1789 | |
80c802f3 | 1790 | if (xdst == NULL) { |
1da177e4 | 1791 | /* To accelerate a bit... */ |
2518c7c2 | 1792 | if ((dst_orig->flags & DST_NOXFRM) || |
52479b62 | 1793 | !net->xfrm.policy_count[XFRM_POLICY_OUT]) |
8b7817f3 | 1794 | goto nopol; |
1da177e4 | 1795 | |
80c802f3 TT |
1796 | flo = flow_cache_lookup(net, fl, family, dir, |
1797 | xfrm_bundle_lookup, dst_orig); | |
1798 | if (flo == NULL) | |
1799 | goto nopol; | |
fe1a5f03 | 1800 | if (IS_ERR(flo)) { |
80c802f3 | 1801 | err = PTR_ERR(flo); |
75b8c133 | 1802 | goto dropdst; |
d66e37a9 | 1803 | } |
80c802f3 TT |
1804 | xdst = container_of(flo, struct xfrm_dst, flo); |
1805 | ||
1806 | num_pols = xdst->num_pols; | |
1807 | num_xfrms = xdst->num_xfrms; | |
1808 | memcpy(pols, xdst->pols, sizeof(struct xfrm_policy*) * num_pols); | |
1809 | route = xdst->route; | |
1810 | } | |
1811 | ||
1812 | dst = &xdst->u.dst; | |
1813 | if (route == NULL && num_xfrms > 0) { | |
1814 | /* The only case when xfrm_bundle_lookup() returns a | |
1815 | * bundle with null route, is when the template could | |
1816 | * not be resolved. It means policies are there, but | |
1817 | * bundle could not be created, since we don't yet | |
1818 | * have the xfrm_state's. We need to wait for KM to | |
1819 | * negotiate new SA's or bail out with error.*/ | |
1820 | if (net->xfrm.sysctl_larval_drop) { | |
1821 | /* EREMOTE tells the caller to generate | |
1822 | * a one-shot blackhole route. */ | |
1823 | dst_release(dst); | |
a1aa3483 | 1824 | xfrm_pols_put(pols, drop_pols); |
80c802f3 TT |
1825 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); |
1826 | return -EREMOTE; | |
1827 | } | |
1828 | if (flags & XFRM_LOOKUP_WAIT) { | |
1829 | DECLARE_WAITQUEUE(wait, current); | |
1830 | ||
1831 | add_wait_queue(&net->xfrm.km_waitq, &wait); | |
1832 | set_current_state(TASK_INTERRUPTIBLE); | |
1833 | schedule(); | |
1834 | set_current_state(TASK_RUNNING); | |
1835 | remove_wait_queue(&net->xfrm.km_waitq, &wait); | |
1836 | ||
1837 | if (!signal_pending(current)) { | |
1838 | dst_release(dst); | |
1839 | goto restart; | |
1840 | } | |
1841 | ||
1842 | err = -ERESTART; | |
1843 | } else | |
1844 | err = -EAGAIN; | |
1845 | ||
1846 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); | |
1847 | goto error; | |
1da177e4 LT |
1848 | } |
1849 | ||
80c802f3 TT |
1850 | no_transform: |
1851 | if (num_pols == 0) | |
8b7817f3 | 1852 | goto nopol; |
1da177e4 | 1853 | |
80c802f3 TT |
1854 | if ((flags & XFRM_LOOKUP_ICMP) && |
1855 | !(pols[0]->flags & XFRM_POLICY_ICMP)) { | |
1856 | err = -ENOENT; | |
8b7817f3 | 1857 | goto error; |
80c802f3 | 1858 | } |
8b7817f3 | 1859 | |
80c802f3 TT |
1860 | for (i = 0; i < num_pols; i++) |
1861 | pols[i]->curlft.use_time = get_seconds(); | |
8b7817f3 | 1862 | |
80c802f3 | 1863 | if (num_xfrms < 0) { |
1da177e4 | 1864 | /* Prohibit the flow */ |
59c9940e | 1865 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK); |
e104411b PM |
1866 | err = -EPERM; |
1867 | goto error; | |
80c802f3 TT |
1868 | } else if (num_xfrms > 0) { |
1869 | /* Flow transformed */ | |
1870 | *dst_p = dst; | |
1871 | dst_release(dst_orig); | |
1872 | } else { | |
1873 | /* Flow passes untransformed */ | |
1874 | dst_release(dst); | |
1da177e4 | 1875 | } |
80c802f3 TT |
1876 | ok: |
1877 | xfrm_pols_put(pols, drop_pols); | |
1da177e4 LT |
1878 | return 0; |
1879 | ||
80c802f3 TT |
1880 | nopol: |
1881 | if (!(flags & XFRM_LOOKUP_ICMP)) | |
1882 | goto ok; | |
1883 | err = -ENOENT; | |
1da177e4 | 1884 | error: |
80c802f3 | 1885 | dst_release(dst); |
75b8c133 HX |
1886 | dropdst: |
1887 | dst_release(dst_orig); | |
1da177e4 | 1888 | *dst_p = NULL; |
80c802f3 | 1889 | xfrm_pols_put(pols, drop_pols); |
1da177e4 LT |
1890 | return err; |
1891 | } | |
14e50e57 DM |
1892 | EXPORT_SYMBOL(__xfrm_lookup); |
1893 | ||
52479b62 | 1894 | int xfrm_lookup(struct net *net, struct dst_entry **dst_p, struct flowi *fl, |
14e50e57 DM |
1895 | struct sock *sk, int flags) |
1896 | { | |
52479b62 | 1897 | int err = __xfrm_lookup(net, dst_p, fl, sk, flags); |
14e50e57 DM |
1898 | |
1899 | if (err == -EREMOTE) { | |
1900 | dst_release(*dst_p); | |
1901 | *dst_p = NULL; | |
1902 | err = -EAGAIN; | |
1903 | } | |
1904 | ||
1905 | return err; | |
1906 | } | |
1da177e4 LT |
1907 | EXPORT_SYMBOL(xfrm_lookup); |
1908 | ||
df0ba92a MN |
1909 | static inline int |
1910 | xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl) | |
1911 | { | |
1912 | struct xfrm_state *x; | |
df0ba92a MN |
1913 | |
1914 | if (!skb->sp || idx < 0 || idx >= skb->sp->len) | |
1915 | return 0; | |
1916 | x = skb->sp->xvec[idx]; | |
1917 | if (!x->type->reject) | |
1918 | return 0; | |
1ecafede | 1919 | return x->type->reject(x, skb, fl); |
df0ba92a MN |
1920 | } |
1921 | ||
1da177e4 LT |
1922 | /* When skb is transformed back to its "native" form, we have to |
1923 | * check policy restrictions. At the moment we make this in maximally | |
1924 | * stupid way. Shame on me. :-) Of course, connected sockets must | |
1925 | * have policy cached at them. | |
1926 | */ | |
1927 | ||
1928 | static inline int | |
a716c119 | 1929 | xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x, |
1da177e4 LT |
1930 | unsigned short family) |
1931 | { | |
1932 | if (xfrm_state_kern(x)) | |
928ba416 | 1933 | return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family); |
1da177e4 LT |
1934 | return x->id.proto == tmpl->id.proto && |
1935 | (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && | |
1936 | (x->props.reqid == tmpl->reqid || !tmpl->reqid) && | |
1937 | x->props.mode == tmpl->mode && | |
c5d18e98 | 1938 | (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) || |
f3bd4840 | 1939 | !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) && |
7e49e6de MN |
1940 | !(x->props.mode != XFRM_MODE_TRANSPORT && |
1941 | xfrm_state_addr_cmp(tmpl, x, family)); | |
1da177e4 LT |
1942 | } |
1943 | ||
df0ba92a MN |
1944 | /* |
1945 | * 0 or more than 0 is returned when validation is succeeded (either bypass | |
1946 | * because of optional transport mode, or next index of the mathced secpath | |
1947 | * state with the template. | |
1948 | * -1 is returned when no matching template is found. | |
1949 | * Otherwise "-2 - errored_index" is returned. | |
1950 | */ | |
1da177e4 LT |
1951 | static inline int |
1952 | xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start, | |
1953 | unsigned short family) | |
1954 | { | |
1955 | int idx = start; | |
1956 | ||
1957 | if (tmpl->optional) { | |
7e49e6de | 1958 | if (tmpl->mode == XFRM_MODE_TRANSPORT) |
1da177e4 LT |
1959 | return start; |
1960 | } else | |
1961 | start = -1; | |
1962 | for (; idx < sp->len; idx++) { | |
dbe5b4aa | 1963 | if (xfrm_state_ok(tmpl, sp->xvec[idx], family)) |
1da177e4 | 1964 | return ++idx; |
df0ba92a MN |
1965 | if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) { |
1966 | if (start == -1) | |
1967 | start = -2-idx; | |
1da177e4 | 1968 | break; |
df0ba92a | 1969 | } |
1da177e4 LT |
1970 | } |
1971 | return start; | |
1972 | } | |
1973 | ||
d5422efe HX |
1974 | int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, |
1975 | unsigned int family, int reverse) | |
1da177e4 LT |
1976 | { |
1977 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
e0d1caa7 | 1978 | int err; |
1da177e4 LT |
1979 | |
1980 | if (unlikely(afinfo == NULL)) | |
1981 | return -EAFNOSUPPORT; | |
1982 | ||
d5422efe | 1983 | afinfo->decode_session(skb, fl, reverse); |
beb8d13b | 1984 | err = security_xfrm_decode_session(skb, &fl->secid); |
1da177e4 | 1985 | xfrm_policy_put_afinfo(afinfo); |
e0d1caa7 | 1986 | return err; |
1da177e4 | 1987 | } |
d5422efe | 1988 | EXPORT_SYMBOL(__xfrm_decode_session); |
1da177e4 | 1989 | |
df0ba92a | 1990 | static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp) |
1da177e4 LT |
1991 | { |
1992 | for (; k < sp->len; k++) { | |
df0ba92a | 1993 | if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) { |
d1d9facf | 1994 | *idxp = k; |
1da177e4 | 1995 | return 1; |
df0ba92a | 1996 | } |
1da177e4 LT |
1997 | } |
1998 | ||
1999 | return 0; | |
2000 | } | |
2001 | ||
a716c119 | 2002 | int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, |
1da177e4 LT |
2003 | unsigned short family) |
2004 | { | |
f6e1e25d | 2005 | struct net *net = dev_net(skb->dev); |
1da177e4 | 2006 | struct xfrm_policy *pol; |
4e81bb83 MN |
2007 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
2008 | int npols = 0; | |
2009 | int xfrm_nr; | |
2010 | int pi; | |
d5422efe | 2011 | int reverse; |
1da177e4 | 2012 | struct flowi fl; |
d5422efe | 2013 | u8 fl_dir; |
df0ba92a | 2014 | int xerr_idx = -1; |
1da177e4 | 2015 | |
d5422efe HX |
2016 | reverse = dir & ~XFRM_POLICY_MASK; |
2017 | dir &= XFRM_POLICY_MASK; | |
2018 | fl_dir = policy_to_flow_dir(dir); | |
2019 | ||
0aa64774 | 2020 | if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) { |
59c9940e | 2021 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); |
1da177e4 | 2022 | return 0; |
0aa64774 MN |
2023 | } |
2024 | ||
eb9c7ebe | 2025 | nf_nat_decode_session(skb, &fl, family); |
1da177e4 LT |
2026 | |
2027 | /* First, check used SA against their selectors. */ | |
2028 | if (skb->sp) { | |
2029 | int i; | |
2030 | ||
2031 | for (i=skb->sp->len-1; i>=0; i--) { | |
dbe5b4aa | 2032 | struct xfrm_state *x = skb->sp->xvec[i]; |
0aa64774 | 2033 | if (!xfrm_selector_match(&x->sel, &fl, family)) { |
59c9940e | 2034 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH); |
1da177e4 | 2035 | return 0; |
0aa64774 | 2036 | } |
1da177e4 LT |
2037 | } |
2038 | } | |
2039 | ||
2040 | pol = NULL; | |
3bccfbc7 | 2041 | if (sk && sk->sk_policy[dir]) { |
e0d1caa7 | 2042 | pol = xfrm_sk_policy_lookup(sk, dir, &fl); |
0aa64774 | 2043 | if (IS_ERR(pol)) { |
59c9940e | 2044 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
3bccfbc7 | 2045 | return 0; |
0aa64774 | 2046 | } |
3bccfbc7 | 2047 | } |
1da177e4 | 2048 | |
fe1a5f03 TT |
2049 | if (!pol) { |
2050 | struct flow_cache_object *flo; | |
2051 | ||
2052 | flo = flow_cache_lookup(net, &fl, family, fl_dir, | |
2053 | xfrm_policy_lookup, NULL); | |
2054 | if (IS_ERR_OR_NULL(flo)) | |
2055 | pol = ERR_CAST(flo); | |
2056 | else | |
2057 | pol = container_of(flo, struct xfrm_policy, flo); | |
2058 | } | |
1da177e4 | 2059 | |
0aa64774 | 2060 | if (IS_ERR(pol)) { |
59c9940e | 2061 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
134b0fc5 | 2062 | return 0; |
0aa64774 | 2063 | } |
134b0fc5 | 2064 | |
df0ba92a | 2065 | if (!pol) { |
d1d9facf | 2066 | if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) { |
df0ba92a | 2067 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
59c9940e | 2068 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS); |
df0ba92a MN |
2069 | return 0; |
2070 | } | |
2071 | return 1; | |
2072 | } | |
1da177e4 | 2073 | |
9d729f72 | 2074 | pol->curlft.use_time = get_seconds(); |
1da177e4 | 2075 | |
4e81bb83 MN |
2076 | pols[0] = pol; |
2077 | npols ++; | |
2078 | #ifdef CONFIG_XFRM_SUB_POLICY | |
2079 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
f6e1e25d | 2080 | pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, |
4e81bb83 MN |
2081 | &fl, family, |
2082 | XFRM_POLICY_IN); | |
2083 | if (pols[1]) { | |
0aa64774 | 2084 | if (IS_ERR(pols[1])) { |
59c9940e | 2085 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
134b0fc5 | 2086 | return 0; |
0aa64774 | 2087 | } |
9d729f72 | 2088 | pols[1]->curlft.use_time = get_seconds(); |
4e81bb83 MN |
2089 | npols ++; |
2090 | } | |
2091 | } | |
2092 | #endif | |
2093 | ||
1da177e4 LT |
2094 | if (pol->action == XFRM_POLICY_ALLOW) { |
2095 | struct sec_path *sp; | |
2096 | static struct sec_path dummy; | |
4e81bb83 | 2097 | struct xfrm_tmpl *tp[XFRM_MAX_DEPTH]; |
41a49cc3 | 2098 | struct xfrm_tmpl *stp[XFRM_MAX_DEPTH]; |
4e81bb83 MN |
2099 | struct xfrm_tmpl **tpp = tp; |
2100 | int ti = 0; | |
1da177e4 LT |
2101 | int i, k; |
2102 | ||
2103 | if ((sp = skb->sp) == NULL) | |
2104 | sp = &dummy; | |
2105 | ||
4e81bb83 MN |
2106 | for (pi = 0; pi < npols; pi++) { |
2107 | if (pols[pi] != pol && | |
0aa64774 | 2108 | pols[pi]->action != XFRM_POLICY_ALLOW) { |
59c9940e | 2109 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); |
4e81bb83 | 2110 | goto reject; |
0aa64774 MN |
2111 | } |
2112 | if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
59c9940e | 2113 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); |
4e81bb83 | 2114 | goto reject_error; |
0aa64774 | 2115 | } |
4e81bb83 MN |
2116 | for (i = 0; i < pols[pi]->xfrm_nr; i++) |
2117 | tpp[ti++] = &pols[pi]->xfrm_vec[i]; | |
2118 | } | |
2119 | xfrm_nr = ti; | |
41a49cc3 MN |
2120 | if (npols > 1) { |
2121 | xfrm_tmpl_sort(stp, tpp, xfrm_nr, family); | |
2122 | tpp = stp; | |
2123 | } | |
4e81bb83 | 2124 | |
1da177e4 LT |
2125 | /* For each tunnel xfrm, find the first matching tmpl. |
2126 | * For each tmpl before that, find corresponding xfrm. | |
2127 | * Order is _important_. Later we will implement | |
2128 | * some barriers, but at the moment barriers | |
2129 | * are implied between each two transformations. | |
2130 | */ | |
4e81bb83 MN |
2131 | for (i = xfrm_nr-1, k = 0; i >= 0; i--) { |
2132 | k = xfrm_policy_ok(tpp[i], sp, k, family); | |
df0ba92a | 2133 | if (k < 0) { |
d1d9facf JM |
2134 | if (k < -1) |
2135 | /* "-2 - errored_index" returned */ | |
2136 | xerr_idx = -(2+k); | |
59c9940e | 2137 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 2138 | goto reject; |
df0ba92a | 2139 | } |
1da177e4 LT |
2140 | } |
2141 | ||
0aa64774 | 2142 | if (secpath_has_nontransport(sp, k, &xerr_idx)) { |
59c9940e | 2143 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 2144 | goto reject; |
0aa64774 | 2145 | } |
1da177e4 | 2146 | |
4e81bb83 | 2147 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
2148 | return 1; |
2149 | } | |
59c9940e | 2150 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); |
1da177e4 LT |
2151 | |
2152 | reject: | |
df0ba92a | 2153 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
4e81bb83 MN |
2154 | reject_error: |
2155 | xfrm_pols_put(pols, npols); | |
1da177e4 LT |
2156 | return 0; |
2157 | } | |
2158 | EXPORT_SYMBOL(__xfrm_policy_check); | |
2159 | ||
2160 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
2161 | { | |
99a66657 | 2162 | struct net *net = dev_net(skb->dev); |
1da177e4 | 2163 | struct flowi fl; |
adf30907 ED |
2164 | struct dst_entry *dst; |
2165 | int res; | |
1da177e4 | 2166 | |
0aa64774 | 2167 | if (xfrm_decode_session(skb, &fl, family) < 0) { |
72032fdb | 2168 | XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR); |
1da177e4 | 2169 | return 0; |
0aa64774 | 2170 | } |
1da177e4 | 2171 | |
fafeeb6c | 2172 | skb_dst_force(skb); |
adf30907 ED |
2173 | dst = skb_dst(skb); |
2174 | ||
2175 | res = xfrm_lookup(net, &dst, &fl, NULL, 0) == 0; | |
2176 | skb_dst_set(skb, dst); | |
2177 | return res; | |
1da177e4 LT |
2178 | } |
2179 | EXPORT_SYMBOL(__xfrm_route_forward); | |
2180 | ||
d49c73c7 DM |
2181 | /* Optimize later using cookies and generation ids. */ |
2182 | ||
1da177e4 LT |
2183 | static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) |
2184 | { | |
d49c73c7 DM |
2185 | /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete |
2186 | * to "-1" to force all XFRM destinations to get validated by | |
2187 | * dst_ops->check on every use. We do this because when a | |
2188 | * normal route referenced by an XFRM dst is obsoleted we do | |
2189 | * not go looking around for all parent referencing XFRM dsts | |
2190 | * so that we can invalidate them. It is just too much work. | |
2191 | * Instead we make the checks here on every use. For example: | |
2192 | * | |
2193 | * XFRM dst A --> IPv4 dst X | |
2194 | * | |
2195 | * X is the "xdst->route" of A (X is also the "dst->path" of A | |
2196 | * in this example). If X is marked obsolete, "A" will not | |
2197 | * notice. That's what we are validating here via the | |
2198 | * stale_bundle() check. | |
2199 | * | |
2200 | * When a policy's bundle is pruned, we dst_free() the XFRM | |
2201 | * dst which causes it's ->obsolete field to be set to a | |
2202 | * positive non-zero integer. If an XFRM dst has been pruned | |
2203 | * like this, we want to force a new route lookup. | |
399c180a | 2204 | */ |
d49c73c7 DM |
2205 | if (dst->obsolete < 0 && !stale_bundle(dst)) |
2206 | return dst; | |
2207 | ||
1da177e4 LT |
2208 | return NULL; |
2209 | } | |
2210 | ||
2211 | static int stale_bundle(struct dst_entry *dst) | |
2212 | { | |
5b368e61 | 2213 | return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0); |
1da177e4 LT |
2214 | } |
2215 | ||
aabc9761 | 2216 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
1da177e4 | 2217 | { |
1da177e4 | 2218 | while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { |
c346dca1 | 2219 | dst->dev = dev_net(dev)->loopback_dev; |
de3cb747 | 2220 | dev_hold(dst->dev); |
1da177e4 LT |
2221 | dev_put(dev); |
2222 | } | |
2223 | } | |
aabc9761 | 2224 | EXPORT_SYMBOL(xfrm_dst_ifdown); |
1da177e4 LT |
2225 | |
2226 | static void xfrm_link_failure(struct sk_buff *skb) | |
2227 | { | |
2228 | /* Impossible. Such dst must be popped before reaches point of failure. */ | |
1da177e4 LT |
2229 | } |
2230 | ||
2231 | static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) | |
2232 | { | |
2233 | if (dst) { | |
2234 | if (dst->obsolete) { | |
2235 | dst_release(dst); | |
2236 | dst = NULL; | |
2237 | } | |
2238 | } | |
2239 | return dst; | |
2240 | } | |
2241 | ||
80c802f3 | 2242 | static void __xfrm_garbage_collect(struct net *net) |
1da177e4 | 2243 | { |
80c802f3 | 2244 | struct dst_entry *head, *next; |
1da177e4 | 2245 | |
80c802f3 | 2246 | flow_cache_flush(); |
4e81bb83 | 2247 | |
80c802f3 TT |
2248 | spin_lock_bh(&xfrm_policy_sk_bundle_lock); |
2249 | head = xfrm_policy_sk_bundles; | |
2250 | xfrm_policy_sk_bundles = NULL; | |
2251 | spin_unlock_bh(&xfrm_policy_sk_bundle_lock); | |
2518c7c2 | 2252 | |
80c802f3 TT |
2253 | while (head) { |
2254 | next = head->next; | |
2255 | dst_free(head); | |
2256 | head = next; | |
1da177e4 LT |
2257 | } |
2258 | } | |
2259 | ||
25ee3286 | 2260 | static void xfrm_init_pmtu(struct dst_entry *dst) |
1da177e4 LT |
2261 | { |
2262 | do { | |
2263 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2264 | u32 pmtu, route_mtu_cached; | |
2265 | ||
2266 | pmtu = dst_mtu(dst->child); | |
2267 | xdst->child_mtu_cached = pmtu; | |
2268 | ||
2269 | pmtu = xfrm_state_mtu(dst->xfrm, pmtu); | |
2270 | ||
2271 | route_mtu_cached = dst_mtu(xdst->route); | |
2272 | xdst->route_mtu_cached = route_mtu_cached; | |
2273 | ||
2274 | if (pmtu > route_mtu_cached) | |
2275 | pmtu = route_mtu_cached; | |
2276 | ||
defb3519 | 2277 | dst_metric_set(dst, RTAX_MTU, pmtu); |
1da177e4 LT |
2278 | } while ((dst = dst->next)); |
2279 | } | |
2280 | ||
1da177e4 LT |
2281 | /* Check that the bundle accepts the flow and its components are |
2282 | * still valid. | |
2283 | */ | |
2284 | ||
1c4c40c4 | 2285 | static int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first, |
5b368e61 | 2286 | struct flowi *fl, int family, int strict) |
1da177e4 LT |
2287 | { |
2288 | struct dst_entry *dst = &first->u.dst; | |
2289 | struct xfrm_dst *last; | |
2290 | u32 mtu; | |
2291 | ||
92d63dec | 2292 | if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || |
1da177e4 LT |
2293 | (dst->dev && !netif_running(dst->dev))) |
2294 | return 0; | |
157bfc25 MN |
2295 | #ifdef CONFIG_XFRM_SUB_POLICY |
2296 | if (fl) { | |
2297 | if (first->origin && !flow_cache_uli_match(first->origin, fl)) | |
2298 | return 0; | |
2299 | if (first->partner && | |
2300 | !xfrm_selector_match(first->partner, fl, family)) | |
2301 | return 0; | |
2302 | } | |
2303 | #endif | |
1da177e4 LT |
2304 | |
2305 | last = NULL; | |
2306 | ||
2307 | do { | |
2308 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2309 | ||
2310 | if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family)) | |
2311 | return 0; | |
67f83cbf VY |
2312 | if (fl && pol && |
2313 | !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl)) | |
e0d1caa7 | 2314 | return 0; |
1da177e4 LT |
2315 | if (dst->xfrm->km.state != XFRM_STATE_VALID) |
2316 | return 0; | |
80c802f3 TT |
2317 | if (xdst->xfrm_genid != dst->xfrm->genid) |
2318 | return 0; | |
b1312c89 TT |
2319 | if (xdst->num_pols > 0 && |
2320 | xdst->policy_genid != atomic_read(&xdst->pols[0]->genid)) | |
9d4a706d | 2321 | return 0; |
e53820de | 2322 | |
1bfcb10f | 2323 | if (strict && fl && |
13996378 | 2324 | !(dst->xfrm->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) && |
e53820de MN |
2325 | !xfrm_state_addr_flow_check(dst->xfrm, fl, family)) |
2326 | return 0; | |
1da177e4 LT |
2327 | |
2328 | mtu = dst_mtu(dst->child); | |
2329 | if (xdst->child_mtu_cached != mtu) { | |
2330 | last = xdst; | |
2331 | xdst->child_mtu_cached = mtu; | |
2332 | } | |
2333 | ||
92d63dec | 2334 | if (!dst_check(xdst->route, xdst->route_cookie)) |
1da177e4 LT |
2335 | return 0; |
2336 | mtu = dst_mtu(xdst->route); | |
2337 | if (xdst->route_mtu_cached != mtu) { | |
2338 | last = xdst; | |
2339 | xdst->route_mtu_cached = mtu; | |
2340 | } | |
2341 | ||
2342 | dst = dst->child; | |
2343 | } while (dst->xfrm); | |
2344 | ||
2345 | if (likely(!last)) | |
2346 | return 1; | |
2347 | ||
2348 | mtu = last->child_mtu_cached; | |
2349 | for (;;) { | |
2350 | dst = &last->u.dst; | |
2351 | ||
2352 | mtu = xfrm_state_mtu(dst->xfrm, mtu); | |
2353 | if (mtu > last->route_mtu_cached) | |
2354 | mtu = last->route_mtu_cached; | |
defb3519 | 2355 | dst_metric_set(dst, RTAX_MTU, mtu); |
1da177e4 LT |
2356 | |
2357 | if (last == first) | |
2358 | break; | |
2359 | ||
bd0bf076 | 2360 | last = (struct xfrm_dst *)last->u.dst.next; |
1da177e4 LT |
2361 | last->child_mtu_cached = mtu; |
2362 | } | |
2363 | ||
2364 | return 1; | |
2365 | } | |
2366 | ||
0dbaee3b DM |
2367 | static unsigned int xfrm_default_advmss(const struct dst_entry *dst) |
2368 | { | |
2369 | return dst_metric_advmss(dst->path); | |
2370 | } | |
2371 | ||
d33e4553 DM |
2372 | static unsigned int xfrm_default_mtu(const struct dst_entry *dst) |
2373 | { | |
2374 | return dst_mtu(dst->path); | |
2375 | } | |
2376 | ||
1da177e4 LT |
2377 | int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) |
2378 | { | |
d7c7544c | 2379 | struct net *net; |
1da177e4 LT |
2380 | int err = 0; |
2381 | if (unlikely(afinfo == NULL)) | |
2382 | return -EINVAL; | |
2383 | if (unlikely(afinfo->family >= NPROTO)) | |
2384 | return -EAFNOSUPPORT; | |
e959d812 | 2385 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2386 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) |
2387 | err = -ENOBUFS; | |
2388 | else { | |
2389 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2390 | if (likely(dst_ops->kmem_cachep == NULL)) | |
2391 | dst_ops->kmem_cachep = xfrm_dst_cache; | |
2392 | if (likely(dst_ops->check == NULL)) | |
2393 | dst_ops->check = xfrm_dst_check; | |
0dbaee3b DM |
2394 | if (likely(dst_ops->default_advmss == NULL)) |
2395 | dst_ops->default_advmss = xfrm_default_advmss; | |
d33e4553 DM |
2396 | if (likely(dst_ops->default_mtu == NULL)) |
2397 | dst_ops->default_mtu = xfrm_default_mtu; | |
1da177e4 LT |
2398 | if (likely(dst_ops->negative_advice == NULL)) |
2399 | dst_ops->negative_advice = xfrm_negative_advice; | |
2400 | if (likely(dst_ops->link_failure == NULL)) | |
2401 | dst_ops->link_failure = xfrm_link_failure; | |
1da177e4 LT |
2402 | if (likely(afinfo->garbage_collect == NULL)) |
2403 | afinfo->garbage_collect = __xfrm_garbage_collect; | |
2404 | xfrm_policy_afinfo[afinfo->family] = afinfo; | |
2405 | } | |
e959d812 | 2406 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
d7c7544c AD |
2407 | |
2408 | rtnl_lock(); | |
2409 | for_each_net(net) { | |
2410 | struct dst_ops *xfrm_dst_ops; | |
2411 | ||
2412 | switch (afinfo->family) { | |
2413 | case AF_INET: | |
2414 | xfrm_dst_ops = &net->xfrm.xfrm4_dst_ops; | |
2415 | break; | |
2416 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
2417 | case AF_INET6: | |
2418 | xfrm_dst_ops = &net->xfrm.xfrm6_dst_ops; | |
2419 | break; | |
2420 | #endif | |
2421 | default: | |
2422 | BUG(); | |
2423 | } | |
2424 | *xfrm_dst_ops = *afinfo->dst_ops; | |
2425 | } | |
2426 | rtnl_unlock(); | |
2427 | ||
1da177e4 LT |
2428 | return err; |
2429 | } | |
2430 | EXPORT_SYMBOL(xfrm_policy_register_afinfo); | |
2431 | ||
2432 | int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2433 | { | |
2434 | int err = 0; | |
2435 | if (unlikely(afinfo == NULL)) | |
2436 | return -EINVAL; | |
2437 | if (unlikely(afinfo->family >= NPROTO)) | |
2438 | return -EAFNOSUPPORT; | |
e959d812 | 2439 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2440 | if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { |
2441 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) | |
2442 | err = -EINVAL; | |
2443 | else { | |
2444 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2445 | xfrm_policy_afinfo[afinfo->family] = NULL; | |
2446 | dst_ops->kmem_cachep = NULL; | |
2447 | dst_ops->check = NULL; | |
1da177e4 LT |
2448 | dst_ops->negative_advice = NULL; |
2449 | dst_ops->link_failure = NULL; | |
1da177e4 LT |
2450 | afinfo->garbage_collect = NULL; |
2451 | } | |
2452 | } | |
e959d812 | 2453 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2454 | return err; |
2455 | } | |
2456 | EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); | |
2457 | ||
d7c7544c AD |
2458 | static void __net_init xfrm_dst_ops_init(struct net *net) |
2459 | { | |
2460 | struct xfrm_policy_afinfo *afinfo; | |
2461 | ||
2462 | read_lock_bh(&xfrm_policy_afinfo_lock); | |
2463 | afinfo = xfrm_policy_afinfo[AF_INET]; | |
2464 | if (afinfo) | |
2465 | net->xfrm.xfrm4_dst_ops = *afinfo->dst_ops; | |
2466 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
2467 | afinfo = xfrm_policy_afinfo[AF_INET6]; | |
2468 | if (afinfo) | |
2469 | net->xfrm.xfrm6_dst_ops = *afinfo->dst_ops; | |
2470 | #endif | |
2471 | read_unlock_bh(&xfrm_policy_afinfo_lock); | |
2472 | } | |
2473 | ||
1da177e4 LT |
2474 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) |
2475 | { | |
2476 | struct xfrm_policy_afinfo *afinfo; | |
2477 | if (unlikely(family >= NPROTO)) | |
2478 | return NULL; | |
2479 | read_lock(&xfrm_policy_afinfo_lock); | |
2480 | afinfo = xfrm_policy_afinfo[family]; | |
546be240 HX |
2481 | if (unlikely(!afinfo)) |
2482 | read_unlock(&xfrm_policy_afinfo_lock); | |
1da177e4 LT |
2483 | return afinfo; |
2484 | } | |
2485 | ||
2486 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2487 | { | |
546be240 HX |
2488 | read_unlock(&xfrm_policy_afinfo_lock); |
2489 | } | |
2490 | ||
1da177e4 LT |
2491 | static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) |
2492 | { | |
e9dc8653 EB |
2493 | struct net_device *dev = ptr; |
2494 | ||
1da177e4 LT |
2495 | switch (event) { |
2496 | case NETDEV_DOWN: | |
80c802f3 | 2497 | __xfrm_garbage_collect(dev_net(dev)); |
1da177e4 LT |
2498 | } |
2499 | return NOTIFY_DONE; | |
2500 | } | |
2501 | ||
2502 | static struct notifier_block xfrm_dev_notifier = { | |
d5917a35 | 2503 | .notifier_call = xfrm_dev_event, |
1da177e4 LT |
2504 | }; |
2505 | ||
558f82ef | 2506 | #ifdef CONFIG_XFRM_STATISTICS |
59c9940e | 2507 | static int __net_init xfrm_statistics_init(struct net *net) |
558f82ef | 2508 | { |
c68cd1a0 AD |
2509 | int rv; |
2510 | ||
7d720c3e | 2511 | if (snmp_mib_init((void __percpu **)net->mib.xfrm_statistics, |
1823e4c8 ED |
2512 | sizeof(struct linux_xfrm_mib), |
2513 | __alignof__(struct linux_xfrm_mib)) < 0) | |
558f82ef | 2514 | return -ENOMEM; |
c68cd1a0 AD |
2515 | rv = xfrm_proc_init(net); |
2516 | if (rv < 0) | |
7d720c3e | 2517 | snmp_mib_free((void __percpu **)net->mib.xfrm_statistics); |
c68cd1a0 | 2518 | return rv; |
558f82ef | 2519 | } |
59c9940e AD |
2520 | |
2521 | static void xfrm_statistics_fini(struct net *net) | |
2522 | { | |
c68cd1a0 | 2523 | xfrm_proc_fini(net); |
7d720c3e | 2524 | snmp_mib_free((void __percpu **)net->mib.xfrm_statistics); |
59c9940e AD |
2525 | } |
2526 | #else | |
2527 | static int __net_init xfrm_statistics_init(struct net *net) | |
2528 | { | |
2529 | return 0; | |
2530 | } | |
2531 | ||
2532 | static void xfrm_statistics_fini(struct net *net) | |
2533 | { | |
2534 | } | |
558f82ef MN |
2535 | #endif |
2536 | ||
d62ddc21 | 2537 | static int __net_init xfrm_policy_init(struct net *net) |
1da177e4 | 2538 | { |
2518c7c2 DM |
2539 | unsigned int hmask, sz; |
2540 | int dir; | |
2541 | ||
d62ddc21 AD |
2542 | if (net_eq(net, &init_net)) |
2543 | xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", | |
1da177e4 | 2544 | sizeof(struct xfrm_dst), |
e5d679f3 | 2545 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
20c2df83 | 2546 | NULL); |
1da177e4 | 2547 | |
2518c7c2 DM |
2548 | hmask = 8 - 1; |
2549 | sz = (hmask+1) * sizeof(struct hlist_head); | |
2550 | ||
93b851c1 AD |
2551 | net->xfrm.policy_byidx = xfrm_hash_alloc(sz); |
2552 | if (!net->xfrm.policy_byidx) | |
2553 | goto out_byidx; | |
8100bea7 | 2554 | net->xfrm.policy_idx_hmask = hmask; |
2518c7c2 DM |
2555 | |
2556 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
2557 | struct xfrm_policy_hash *htab; | |
2558 | ||
dc2caba7 | 2559 | net->xfrm.policy_count[dir] = 0; |
8b18f8ea | 2560 | INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]); |
2518c7c2 | 2561 | |
a35f6c5d | 2562 | htab = &net->xfrm.policy_bydst[dir]; |
44e36b42 | 2563 | htab->table = xfrm_hash_alloc(sz); |
2518c7c2 | 2564 | if (!htab->table) |
a35f6c5d AD |
2565 | goto out_bydst; |
2566 | htab->hmask = hmask; | |
2518c7c2 DM |
2567 | } |
2568 | ||
adfcf0b2 | 2569 | INIT_LIST_HEAD(&net->xfrm.policy_all); |
66caf628 | 2570 | INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize); |
d62ddc21 AD |
2571 | if (net_eq(net, &init_net)) |
2572 | register_netdevice_notifier(&xfrm_dev_notifier); | |
2573 | return 0; | |
93b851c1 | 2574 | |
a35f6c5d AD |
2575 | out_bydst: |
2576 | for (dir--; dir >= 0; dir--) { | |
2577 | struct xfrm_policy_hash *htab; | |
2578 | ||
2579 | htab = &net->xfrm.policy_bydst[dir]; | |
2580 | xfrm_hash_free(htab->table, sz); | |
2581 | } | |
2582 | xfrm_hash_free(net->xfrm.policy_byidx, sz); | |
93b851c1 AD |
2583 | out_byidx: |
2584 | return -ENOMEM; | |
d62ddc21 AD |
2585 | } |
2586 | ||
2587 | static void xfrm_policy_fini(struct net *net) | |
2588 | { | |
7c2776ee | 2589 | struct xfrm_audit audit_info; |
93b851c1 | 2590 | unsigned int sz; |
8b18f8ea | 2591 | int dir; |
93b851c1 | 2592 | |
7c2776ee AD |
2593 | flush_work(&net->xfrm.policy_hash_work); |
2594 | #ifdef CONFIG_XFRM_SUB_POLICY | |
2595 | audit_info.loginuid = -1; | |
2596 | audit_info.sessionid = -1; | |
2597 | audit_info.secid = 0; | |
2598 | xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, &audit_info); | |
2599 | #endif | |
2600 | audit_info.loginuid = -1; | |
2601 | audit_info.sessionid = -1; | |
2602 | audit_info.secid = 0; | |
2603 | xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info); | |
7c2776ee | 2604 | |
adfcf0b2 | 2605 | WARN_ON(!list_empty(&net->xfrm.policy_all)); |
93b851c1 | 2606 | |
8b18f8ea | 2607 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
a35f6c5d AD |
2608 | struct xfrm_policy_hash *htab; |
2609 | ||
8b18f8ea | 2610 | WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir])); |
a35f6c5d AD |
2611 | |
2612 | htab = &net->xfrm.policy_bydst[dir]; | |
2613 | sz = (htab->hmask + 1); | |
2614 | WARN_ON(!hlist_empty(htab->table)); | |
2615 | xfrm_hash_free(htab->table, sz); | |
8b18f8ea AD |
2616 | } |
2617 | ||
8100bea7 | 2618 | sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head); |
93b851c1 AD |
2619 | WARN_ON(!hlist_empty(net->xfrm.policy_byidx)); |
2620 | xfrm_hash_free(net->xfrm.policy_byidx, sz); | |
1da177e4 LT |
2621 | } |
2622 | ||
d62ddc21 AD |
2623 | static int __net_init xfrm_net_init(struct net *net) |
2624 | { | |
2625 | int rv; | |
2626 | ||
59c9940e AD |
2627 | rv = xfrm_statistics_init(net); |
2628 | if (rv < 0) | |
2629 | goto out_statistics; | |
d62ddc21 AD |
2630 | rv = xfrm_state_init(net); |
2631 | if (rv < 0) | |
2632 | goto out_state; | |
2633 | rv = xfrm_policy_init(net); | |
2634 | if (rv < 0) | |
2635 | goto out_policy; | |
d7c7544c | 2636 | xfrm_dst_ops_init(net); |
b27aeadb AD |
2637 | rv = xfrm_sysctl_init(net); |
2638 | if (rv < 0) | |
2639 | goto out_sysctl; | |
d62ddc21 AD |
2640 | return 0; |
2641 | ||
b27aeadb AD |
2642 | out_sysctl: |
2643 | xfrm_policy_fini(net); | |
d62ddc21 AD |
2644 | out_policy: |
2645 | xfrm_state_fini(net); | |
2646 | out_state: | |
59c9940e AD |
2647 | xfrm_statistics_fini(net); |
2648 | out_statistics: | |
d62ddc21 AD |
2649 | return rv; |
2650 | } | |
2651 | ||
2652 | static void __net_exit xfrm_net_exit(struct net *net) | |
2653 | { | |
b27aeadb | 2654 | xfrm_sysctl_fini(net); |
d62ddc21 AD |
2655 | xfrm_policy_fini(net); |
2656 | xfrm_state_fini(net); | |
59c9940e | 2657 | xfrm_statistics_fini(net); |
d62ddc21 AD |
2658 | } |
2659 | ||
2660 | static struct pernet_operations __net_initdata xfrm_net_ops = { | |
2661 | .init = xfrm_net_init, | |
2662 | .exit = xfrm_net_exit, | |
2663 | }; | |
2664 | ||
1da177e4 LT |
2665 | void __init xfrm_init(void) |
2666 | { | |
d62ddc21 | 2667 | register_pernet_subsys(&xfrm_net_ops); |
1da177e4 LT |
2668 | xfrm_input_init(); |
2669 | } | |
2670 | ||
ab5f5e8b | 2671 | #ifdef CONFIG_AUDITSYSCALL |
1486cbd7 IJ |
2672 | static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp, |
2673 | struct audit_buffer *audit_buf) | |
ab5f5e8b | 2674 | { |
875179fa PM |
2675 | struct xfrm_sec_ctx *ctx = xp->security; |
2676 | struct xfrm_selector *sel = &xp->selector; | |
2677 | ||
2678 | if (ctx) | |
ab5f5e8b | 2679 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", |
875179fa | 2680 | ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); |
ab5f5e8b | 2681 | |
875179fa | 2682 | switch(sel->family) { |
ab5f5e8b | 2683 | case AF_INET: |
21454aaa | 2684 | audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4); |
875179fa PM |
2685 | if (sel->prefixlen_s != 32) |
2686 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2687 | sel->prefixlen_s); | |
21454aaa | 2688 | audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4); |
875179fa PM |
2689 | if (sel->prefixlen_d != 32) |
2690 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2691 | sel->prefixlen_d); | |
ab5f5e8b JL |
2692 | break; |
2693 | case AF_INET6: | |
5b095d98 | 2694 | audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6); |
875179fa PM |
2695 | if (sel->prefixlen_s != 128) |
2696 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2697 | sel->prefixlen_s); | |
5b095d98 | 2698 | audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6); |
875179fa PM |
2699 | if (sel->prefixlen_d != 128) |
2700 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2701 | sel->prefixlen_d); | |
ab5f5e8b JL |
2702 | break; |
2703 | } | |
2704 | } | |
2705 | ||
68277acc | 2706 | void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, |
2532386f | 2707 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2708 | { |
2709 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2710 | |
afeb14b4 | 2711 | audit_buf = xfrm_audit_start("SPD-add"); |
ab5f5e8b JL |
2712 | if (audit_buf == NULL) |
2713 | return; | |
2532386f | 2714 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 | 2715 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
2716 | xfrm_audit_common_policyinfo(xp, audit_buf); |
2717 | audit_log_end(audit_buf); | |
2718 | } | |
2719 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_add); | |
2720 | ||
68277acc | 2721 | void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, |
2532386f | 2722 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2723 | { |
2724 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2725 | |
afeb14b4 | 2726 | audit_buf = xfrm_audit_start("SPD-delete"); |
ab5f5e8b JL |
2727 | if (audit_buf == NULL) |
2728 | return; | |
2532386f | 2729 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 | 2730 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
2731 | xfrm_audit_common_policyinfo(xp, audit_buf); |
2732 | audit_log_end(audit_buf); | |
2733 | } | |
2734 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete); | |
2735 | #endif | |
2736 | ||
80c9abaa SS |
2737 | #ifdef CONFIG_XFRM_MIGRATE |
2738 | static int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp, | |
2739 | struct xfrm_selector *sel_tgt) | |
2740 | { | |
2741 | if (sel_cmp->proto == IPSEC_ULPROTO_ANY) { | |
2742 | if (sel_tgt->family == sel_cmp->family && | |
2743 | xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr, | |
a716c119 | 2744 | sel_cmp->family) == 0 && |
80c9abaa SS |
2745 | xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr, |
2746 | sel_cmp->family) == 0 && | |
2747 | sel_tgt->prefixlen_d == sel_cmp->prefixlen_d && | |
2748 | sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) { | |
2749 | return 1; | |
2750 | } | |
2751 | } else { | |
2752 | if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) { | |
2753 | return 1; | |
2754 | } | |
2755 | } | |
2756 | return 0; | |
2757 | } | |
2758 | ||
2759 | static struct xfrm_policy * xfrm_migrate_policy_find(struct xfrm_selector *sel, | |
2760 | u8 dir, u8 type) | |
2761 | { | |
2762 | struct xfrm_policy *pol, *ret = NULL; | |
2763 | struct hlist_node *entry; | |
2764 | struct hlist_head *chain; | |
2765 | u32 priority = ~0U; | |
2766 | ||
2767 | read_lock_bh(&xfrm_policy_lock); | |
1121994c | 2768 | chain = policy_hash_direct(&init_net, &sel->daddr, &sel->saddr, sel->family, dir); |
80c9abaa SS |
2769 | hlist_for_each_entry(pol, entry, chain, bydst) { |
2770 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2771 | pol->type == type) { | |
2772 | ret = pol; | |
2773 | priority = ret->priority; | |
2774 | break; | |
2775 | } | |
2776 | } | |
8b18f8ea | 2777 | chain = &init_net.xfrm.policy_inexact[dir]; |
80c9abaa SS |
2778 | hlist_for_each_entry(pol, entry, chain, bydst) { |
2779 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2780 | pol->type == type && | |
2781 | pol->priority < priority) { | |
2782 | ret = pol; | |
2783 | break; | |
2784 | } | |
2785 | } | |
2786 | ||
2787 | if (ret) | |
2788 | xfrm_pol_hold(ret); | |
2789 | ||
2790 | read_unlock_bh(&xfrm_policy_lock); | |
2791 | ||
2792 | return ret; | |
2793 | } | |
2794 | ||
2795 | static int migrate_tmpl_match(struct xfrm_migrate *m, struct xfrm_tmpl *t) | |
2796 | { | |
2797 | int match = 0; | |
2798 | ||
2799 | if (t->mode == m->mode && t->id.proto == m->proto && | |
2800 | (m->reqid == 0 || t->reqid == m->reqid)) { | |
2801 | switch (t->mode) { | |
2802 | case XFRM_MODE_TUNNEL: | |
2803 | case XFRM_MODE_BEET: | |
2804 | if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr, | |
2805 | m->old_family) == 0 && | |
2806 | xfrm_addr_cmp(&t->saddr, &m->old_saddr, | |
2807 | m->old_family) == 0) { | |
2808 | match = 1; | |
2809 | } | |
2810 | break; | |
2811 | case XFRM_MODE_TRANSPORT: | |
2812 | /* in case of transport mode, template does not store | |
2813 | any IP addresses, hence we just compare mode and | |
2814 | protocol */ | |
2815 | match = 1; | |
2816 | break; | |
2817 | default: | |
2818 | break; | |
2819 | } | |
2820 | } | |
2821 | return match; | |
2822 | } | |
2823 | ||
2824 | /* update endpoint address(es) of template(s) */ | |
2825 | static int xfrm_policy_migrate(struct xfrm_policy *pol, | |
2826 | struct xfrm_migrate *m, int num_migrate) | |
2827 | { | |
2828 | struct xfrm_migrate *mp; | |
80c9abaa SS |
2829 | int i, j, n = 0; |
2830 | ||
2831 | write_lock_bh(&pol->lock); | |
12a169e7 | 2832 | if (unlikely(pol->walk.dead)) { |
80c9abaa SS |
2833 | /* target policy has been deleted */ |
2834 | write_unlock_bh(&pol->lock); | |
2835 | return -ENOENT; | |
2836 | } | |
2837 | ||
2838 | for (i = 0; i < pol->xfrm_nr; i++) { | |
2839 | for (j = 0, mp = m; j < num_migrate; j++, mp++) { | |
2840 | if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i])) | |
2841 | continue; | |
2842 | n++; | |
1bfcb10f HX |
2843 | if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL && |
2844 | pol->xfrm_vec[i].mode != XFRM_MODE_BEET) | |
80c9abaa SS |
2845 | continue; |
2846 | /* update endpoints */ | |
2847 | memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr, | |
2848 | sizeof(pol->xfrm_vec[i].id.daddr)); | |
2849 | memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr, | |
2850 | sizeof(pol->xfrm_vec[i].saddr)); | |
2851 | pol->xfrm_vec[i].encap_family = mp->new_family; | |
2852 | /* flush bundles */ | |
80c802f3 | 2853 | atomic_inc(&pol->genid); |
80c9abaa SS |
2854 | } |
2855 | } | |
2856 | ||
2857 | write_unlock_bh(&pol->lock); | |
2858 | ||
2859 | if (!n) | |
2860 | return -ENODATA; | |
2861 | ||
2862 | return 0; | |
2863 | } | |
2864 | ||
2865 | static int xfrm_migrate_check(struct xfrm_migrate *m, int num_migrate) | |
2866 | { | |
2867 | int i, j; | |
2868 | ||
2869 | if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) | |
2870 | return -EINVAL; | |
2871 | ||
2872 | for (i = 0; i < num_migrate; i++) { | |
2873 | if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr, | |
2874 | m[i].old_family) == 0) && | |
2875 | (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr, | |
2876 | m[i].old_family) == 0)) | |
2877 | return -EINVAL; | |
2878 | if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) || | |
2879 | xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) | |
2880 | return -EINVAL; | |
2881 | ||
2882 | /* check if there is any duplicated entry */ | |
2883 | for (j = i + 1; j < num_migrate; j++) { | |
2884 | if (!memcmp(&m[i].old_daddr, &m[j].old_daddr, | |
2885 | sizeof(m[i].old_daddr)) && | |
2886 | !memcmp(&m[i].old_saddr, &m[j].old_saddr, | |
2887 | sizeof(m[i].old_saddr)) && | |
2888 | m[i].proto == m[j].proto && | |
2889 | m[i].mode == m[j].mode && | |
2890 | m[i].reqid == m[j].reqid && | |
2891 | m[i].old_family == m[j].old_family) | |
2892 | return -EINVAL; | |
2893 | } | |
2894 | } | |
2895 | ||
2896 | return 0; | |
2897 | } | |
2898 | ||
2899 | int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type, | |
13c1d189 AE |
2900 | struct xfrm_migrate *m, int num_migrate, |
2901 | struct xfrm_kmaddress *k) | |
80c9abaa SS |
2902 | { |
2903 | int i, err, nx_cur = 0, nx_new = 0; | |
2904 | struct xfrm_policy *pol = NULL; | |
2905 | struct xfrm_state *x, *xc; | |
2906 | struct xfrm_state *x_cur[XFRM_MAX_DEPTH]; | |
2907 | struct xfrm_state *x_new[XFRM_MAX_DEPTH]; | |
2908 | struct xfrm_migrate *mp; | |
2909 | ||
2910 | if ((err = xfrm_migrate_check(m, num_migrate)) < 0) | |
2911 | goto out; | |
2912 | ||
2913 | /* Stage 1 - find policy */ | |
2914 | if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) { | |
2915 | err = -ENOENT; | |
2916 | goto out; | |
2917 | } | |
2918 | ||
2919 | /* Stage 2 - find and update state(s) */ | |
2920 | for (i = 0, mp = m; i < num_migrate; i++, mp++) { | |
2921 | if ((x = xfrm_migrate_state_find(mp))) { | |
2922 | x_cur[nx_cur] = x; | |
2923 | nx_cur++; | |
2924 | if ((xc = xfrm_state_migrate(x, mp))) { | |
2925 | x_new[nx_new] = xc; | |
2926 | nx_new++; | |
2927 | } else { | |
2928 | err = -ENODATA; | |
2929 | goto restore_state; | |
2930 | } | |
2931 | } | |
2932 | } | |
2933 | ||
2934 | /* Stage 3 - update policy */ | |
2935 | if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0) | |
2936 | goto restore_state; | |
2937 | ||
2938 | /* Stage 4 - delete old state(s) */ | |
2939 | if (nx_cur) { | |
2940 | xfrm_states_put(x_cur, nx_cur); | |
2941 | xfrm_states_delete(x_cur, nx_cur); | |
2942 | } | |
2943 | ||
2944 | /* Stage 5 - announce */ | |
13c1d189 | 2945 | km_migrate(sel, dir, type, m, num_migrate, k); |
80c9abaa SS |
2946 | |
2947 | xfrm_pol_put(pol); | |
2948 | ||
2949 | return 0; | |
2950 | out: | |
2951 | return err; | |
2952 | ||
2953 | restore_state: | |
2954 | if (pol) | |
2955 | xfrm_pol_put(pol); | |
2956 | if (nx_cur) | |
2957 | xfrm_states_put(x_cur, nx_cur); | |
2958 | if (nx_new) | |
2959 | xfrm_states_delete(x_new, nx_new); | |
2960 | ||
2961 | return err; | |
2962 | } | |
e610e679 | 2963 | EXPORT_SYMBOL(xfrm_migrate); |
80c9abaa | 2964 | #endif |