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> |
6ce74ec7 | 29 | #include <net/flow.h> |
1da177e4 LT |
30 | #include <net/xfrm.h> |
31 | #include <net/ip.h> | |
558f82ef MN |
32 | #ifdef CONFIG_XFRM_STATISTICS |
33 | #include <net/snmp.h> | |
34 | #endif | |
1da177e4 | 35 | |
44e36b42 DM |
36 | #include "xfrm_hash.h" |
37 | ||
4a3e2f71 AV |
38 | DEFINE_MUTEX(xfrm_cfg_mutex); |
39 | EXPORT_SYMBOL(xfrm_cfg_mutex); | |
1da177e4 | 40 | |
80c802f3 TT |
41 | static DEFINE_SPINLOCK(xfrm_policy_sk_bundle_lock); |
42 | static struct dst_entry *xfrm_policy_sk_bundles; | |
1da177e4 LT |
43 | static DEFINE_RWLOCK(xfrm_policy_lock); |
44 | ||
418a99ac PJ |
45 | static DEFINE_SPINLOCK(xfrm_policy_afinfo_lock); |
46 | static struct xfrm_policy_afinfo __rcu *xfrm_policy_afinfo[NPROTO] | |
47 | __read_mostly; | |
1da177e4 | 48 | |
e18b890b | 49 | static struct kmem_cache *xfrm_dst_cache __read_mostly; |
1da177e4 | 50 | |
1da177e4 | 51 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family); |
418a99ac | 52 | static inline void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo); |
25ee3286 | 53 | static void xfrm_init_pmtu(struct dst_entry *dst); |
80c802f3 | 54 | static int stale_bundle(struct dst_entry *dst); |
12fdb4d3 | 55 | static int xfrm_bundle_ok(struct xfrm_dst *xdst); |
1c4c40c4 | 56 | |
1da177e4 | 57 | |
29fa0b30 WY |
58 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, |
59 | int dir); | |
60 | ||
bc9b35ad | 61 | static inline bool |
200ce96e | 62 | __xfrm4_selector_match(const struct xfrm_selector *sel, const struct flowi *fl) |
77681021 | 63 | { |
7e1dc7b6 DM |
64 | const struct flowi4 *fl4 = &fl->u.ip4; |
65 | ||
26bff940 AD |
66 | return addr4_match(fl4->daddr, sel->daddr.a4, sel->prefixlen_d) && |
67 | addr4_match(fl4->saddr, sel->saddr.a4, sel->prefixlen_s) && | |
7e1dc7b6 DM |
68 | !((xfrm_flowi_dport(fl, &fl4->uli) ^ sel->dport) & sel->dport_mask) && |
69 | !((xfrm_flowi_sport(fl, &fl4->uli) ^ sel->sport) & sel->sport_mask) && | |
70 | (fl4->flowi4_proto == sel->proto || !sel->proto) && | |
71 | (fl4->flowi4_oif == sel->ifindex || !sel->ifindex); | |
77681021 AM |
72 | } |
73 | ||
bc9b35ad | 74 | static inline bool |
200ce96e | 75 | __xfrm6_selector_match(const struct xfrm_selector *sel, const struct flowi *fl) |
77681021 | 76 | { |
7e1dc7b6 DM |
77 | const struct flowi6 *fl6 = &fl->u.ip6; |
78 | ||
79 | return addr_match(&fl6->daddr, &sel->daddr, sel->prefixlen_d) && | |
80 | addr_match(&fl6->saddr, &sel->saddr, sel->prefixlen_s) && | |
81 | !((xfrm_flowi_dport(fl, &fl6->uli) ^ sel->dport) & sel->dport_mask) && | |
82 | !((xfrm_flowi_sport(fl, &fl6->uli) ^ sel->sport) & sel->sport_mask) && | |
83 | (fl6->flowi6_proto == sel->proto || !sel->proto) && | |
84 | (fl6->flowi6_oif == sel->ifindex || !sel->ifindex); | |
77681021 AM |
85 | } |
86 | ||
bc9b35ad DM |
87 | bool xfrm_selector_match(const struct xfrm_selector *sel, const struct flowi *fl, |
88 | unsigned short family) | |
77681021 AM |
89 | { |
90 | switch (family) { | |
91 | case AF_INET: | |
92 | return __xfrm4_selector_match(sel, fl); | |
93 | case AF_INET6: | |
94 | return __xfrm6_selector_match(sel, fl); | |
95 | } | |
bc9b35ad | 96 | return false; |
77681021 AM |
97 | } |
98 | ||
c5b3cf46 | 99 | static inline struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, |
6418c4e0 DM |
100 | const xfrm_address_t *saddr, |
101 | const xfrm_address_t *daddr, | |
9bb182a7 YH |
102 | int family) |
103 | { | |
104 | struct xfrm_policy_afinfo *afinfo; | |
105 | struct dst_entry *dst; | |
106 | ||
107 | afinfo = xfrm_policy_get_afinfo(family); | |
108 | if (unlikely(afinfo == NULL)) | |
109 | return ERR_PTR(-EAFNOSUPPORT); | |
110 | ||
c5b3cf46 | 111 | dst = afinfo->dst_lookup(net, tos, saddr, daddr); |
9bb182a7 YH |
112 | |
113 | xfrm_policy_put_afinfo(afinfo); | |
114 | ||
115 | return dst; | |
116 | } | |
117 | ||
25ee3286 | 118 | static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos, |
9bb182a7 YH |
119 | xfrm_address_t *prev_saddr, |
120 | xfrm_address_t *prev_daddr, | |
25ee3286 | 121 | int family) |
1da177e4 | 122 | { |
c5b3cf46 | 123 | struct net *net = xs_net(x); |
66cdb3ca HX |
124 | xfrm_address_t *saddr = &x->props.saddr; |
125 | xfrm_address_t *daddr = &x->id.daddr; | |
66cdb3ca HX |
126 | struct dst_entry *dst; |
127 | ||
9bb182a7 | 128 | if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) { |
66cdb3ca | 129 | saddr = x->coaddr; |
9bb182a7 YH |
130 | daddr = prev_daddr; |
131 | } | |
132 | if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) { | |
133 | saddr = prev_saddr; | |
66cdb3ca | 134 | daddr = x->coaddr; |
9bb182a7 | 135 | } |
1da177e4 | 136 | |
c5b3cf46 | 137 | dst = __xfrm_dst_lookup(net, tos, saddr, daddr, family); |
9bb182a7 YH |
138 | |
139 | if (!IS_ERR(dst)) { | |
140 | if (prev_saddr != saddr) | |
141 | memcpy(prev_saddr, saddr, sizeof(*prev_saddr)); | |
142 | if (prev_daddr != daddr) | |
143 | memcpy(prev_daddr, daddr, sizeof(*prev_daddr)); | |
144 | } | |
1da177e4 | 145 | |
66cdb3ca | 146 | return dst; |
1da177e4 | 147 | } |
1da177e4 | 148 | |
1da177e4 LT |
149 | static inline unsigned long make_jiffies(long secs) |
150 | { | |
151 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
152 | return MAX_SCHEDULE_TIMEOUT-1; | |
153 | else | |
a716c119 | 154 | return secs*HZ; |
1da177e4 LT |
155 | } |
156 | ||
157 | static void xfrm_policy_timer(unsigned long data) | |
158 | { | |
159 | struct xfrm_policy *xp = (struct xfrm_policy*)data; | |
9d729f72 | 160 | unsigned long now = get_seconds(); |
1da177e4 LT |
161 | long next = LONG_MAX; |
162 | int warn = 0; | |
163 | int dir; | |
164 | ||
165 | read_lock(&xp->lock); | |
166 | ||
ea2dea9d | 167 | if (unlikely(xp->walk.dead)) |
1da177e4 LT |
168 | goto out; |
169 | ||
77d8d7a6 | 170 | dir = xfrm_policy_id2dir(xp->index); |
1da177e4 LT |
171 | |
172 | if (xp->lft.hard_add_expires_seconds) { | |
173 | long tmo = xp->lft.hard_add_expires_seconds + | |
174 | xp->curlft.add_time - now; | |
175 | if (tmo <= 0) | |
176 | goto expired; | |
177 | if (tmo < next) | |
178 | next = tmo; | |
179 | } | |
180 | if (xp->lft.hard_use_expires_seconds) { | |
181 | long tmo = xp->lft.hard_use_expires_seconds + | |
182 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
183 | if (tmo <= 0) | |
184 | goto expired; | |
185 | if (tmo < next) | |
186 | next = tmo; | |
187 | } | |
188 | if (xp->lft.soft_add_expires_seconds) { | |
189 | long tmo = xp->lft.soft_add_expires_seconds + | |
190 | xp->curlft.add_time - now; | |
191 | if (tmo <= 0) { | |
192 | warn = 1; | |
193 | tmo = XFRM_KM_TIMEOUT; | |
194 | } | |
195 | if (tmo < next) | |
196 | next = tmo; | |
197 | } | |
198 | if (xp->lft.soft_use_expires_seconds) { | |
199 | long tmo = xp->lft.soft_use_expires_seconds + | |
200 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
201 | if (tmo <= 0) { | |
202 | warn = 1; | |
203 | tmo = XFRM_KM_TIMEOUT; | |
204 | } | |
205 | if (tmo < next) | |
206 | next = tmo; | |
207 | } | |
208 | ||
209 | if (warn) | |
6c5c8ca7 | 210 | km_policy_expired(xp, dir, 0, 0); |
1da177e4 LT |
211 | if (next != LONG_MAX && |
212 | !mod_timer(&xp->timer, jiffies + make_jiffies(next))) | |
213 | xfrm_pol_hold(xp); | |
214 | ||
215 | out: | |
216 | read_unlock(&xp->lock); | |
217 | xfrm_pol_put(xp); | |
218 | return; | |
219 | ||
220 | expired: | |
221 | read_unlock(&xp->lock); | |
4666faab | 222 | if (!xfrm_policy_delete(xp, dir)) |
6c5c8ca7 | 223 | km_policy_expired(xp, dir, 1, 0); |
1da177e4 LT |
224 | xfrm_pol_put(xp); |
225 | } | |
226 | ||
fe1a5f03 TT |
227 | static struct flow_cache_object *xfrm_policy_flo_get(struct flow_cache_object *flo) |
228 | { | |
229 | struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo); | |
230 | ||
231 | if (unlikely(pol->walk.dead)) | |
232 | flo = NULL; | |
233 | else | |
234 | xfrm_pol_hold(pol); | |
235 | ||
236 | return flo; | |
237 | } | |
238 | ||
239 | static int xfrm_policy_flo_check(struct flow_cache_object *flo) | |
240 | { | |
241 | struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo); | |
242 | ||
243 | return !pol->walk.dead; | |
244 | } | |
245 | ||
246 | static void xfrm_policy_flo_delete(struct flow_cache_object *flo) | |
247 | { | |
248 | xfrm_pol_put(container_of(flo, struct xfrm_policy, flo)); | |
249 | } | |
250 | ||
251 | static const struct flow_cache_ops xfrm_policy_fc_ops = { | |
252 | .get = xfrm_policy_flo_get, | |
253 | .check = xfrm_policy_flo_check, | |
254 | .delete = xfrm_policy_flo_delete, | |
255 | }; | |
1da177e4 LT |
256 | |
257 | /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2 | |
258 | * SPD calls. | |
259 | */ | |
260 | ||
0331b1f3 | 261 | struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp) |
1da177e4 LT |
262 | { |
263 | struct xfrm_policy *policy; | |
264 | ||
0da974f4 | 265 | policy = kzalloc(sizeof(struct xfrm_policy), gfp); |
1da177e4 LT |
266 | |
267 | if (policy) { | |
0331b1f3 | 268 | write_pnet(&policy->xp_net, net); |
12a169e7 | 269 | INIT_LIST_HEAD(&policy->walk.all); |
2518c7c2 DM |
270 | INIT_HLIST_NODE(&policy->bydst); |
271 | INIT_HLIST_NODE(&policy->byidx); | |
1da177e4 | 272 | rwlock_init(&policy->lock); |
2518c7c2 | 273 | atomic_set(&policy->refcnt, 1); |
b24b8a24 PE |
274 | setup_timer(&policy->timer, xfrm_policy_timer, |
275 | (unsigned long)policy); | |
fe1a5f03 | 276 | policy->flo.ops = &xfrm_policy_fc_ops; |
1da177e4 LT |
277 | } |
278 | return policy; | |
279 | } | |
280 | EXPORT_SYMBOL(xfrm_policy_alloc); | |
281 | ||
282 | /* Destroy xfrm_policy: descendant resources must be released to this moment. */ | |
283 | ||
64c31b3f | 284 | void xfrm_policy_destroy(struct xfrm_policy *policy) |
1da177e4 | 285 | { |
12a169e7 | 286 | BUG_ON(!policy->walk.dead); |
1da177e4 | 287 | |
1da177e4 LT |
288 | if (del_timer(&policy->timer)) |
289 | BUG(); | |
290 | ||
03e1ad7b | 291 | security_xfrm_policy_free(policy->security); |
1da177e4 LT |
292 | kfree(policy); |
293 | } | |
64c31b3f | 294 | EXPORT_SYMBOL(xfrm_policy_destroy); |
1da177e4 | 295 | |
1da177e4 LT |
296 | /* Rule must be locked. Release descentant resources, announce |
297 | * entry dead. The rule must be unlinked from lists to the moment. | |
298 | */ | |
299 | ||
300 | static void xfrm_policy_kill(struct xfrm_policy *policy) | |
301 | { | |
12a169e7 | 302 | policy->walk.dead = 1; |
1da177e4 | 303 | |
285ead17 | 304 | atomic_inc(&policy->genid); |
1da177e4 | 305 | |
285ead17 TT |
306 | if (del_timer(&policy->timer)) |
307 | xfrm_pol_put(policy); | |
308 | ||
309 | xfrm_pol_put(policy); | |
1da177e4 LT |
310 | } |
311 | ||
2518c7c2 DM |
312 | static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024; |
313 | ||
e92303f8 | 314 | static inline unsigned int idx_hash(struct net *net, u32 index) |
2518c7c2 | 315 | { |
e92303f8 | 316 | return __idx_hash(index, net->xfrm.policy_idx_hmask); |
2518c7c2 DM |
317 | } |
318 | ||
5f803b58 DM |
319 | static struct hlist_head *policy_hash_bysel(struct net *net, |
320 | const struct xfrm_selector *sel, | |
321 | unsigned short family, int dir) | |
2518c7c2 | 322 | { |
1121994c | 323 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
324 | unsigned int hash = __sel_hash(sel, family, hmask); |
325 | ||
326 | return (hash == hmask + 1 ? | |
1121994c AD |
327 | &net->xfrm.policy_inexact[dir] : |
328 | net->xfrm.policy_bydst[dir].table + hash); | |
2518c7c2 DM |
329 | } |
330 | ||
5f803b58 DM |
331 | static struct hlist_head *policy_hash_direct(struct net *net, |
332 | const xfrm_address_t *daddr, | |
333 | const xfrm_address_t *saddr, | |
334 | unsigned short family, int dir) | |
2518c7c2 | 335 | { |
1121994c | 336 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
337 | unsigned int hash = __addr_hash(daddr, saddr, family, hmask); |
338 | ||
1121994c | 339 | return net->xfrm.policy_bydst[dir].table + hash; |
2518c7c2 DM |
340 | } |
341 | ||
2518c7c2 DM |
342 | static void xfrm_dst_hash_transfer(struct hlist_head *list, |
343 | struct hlist_head *ndsttable, | |
344 | unsigned int nhashmask) | |
345 | { | |
b791160b | 346 | struct hlist_node *entry, *tmp, *entry0 = NULL; |
2518c7c2 | 347 | struct xfrm_policy *pol; |
b791160b | 348 | unsigned int h0 = 0; |
2518c7c2 | 349 | |
b791160b | 350 | redo: |
2518c7c2 DM |
351 | hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) { |
352 | unsigned int h; | |
353 | ||
354 | h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr, | |
355 | pol->family, nhashmask); | |
b791160b YH |
356 | if (!entry0) { |
357 | hlist_del(entry); | |
358 | hlist_add_head(&pol->bydst, ndsttable+h); | |
359 | h0 = h; | |
360 | } else { | |
361 | if (h != h0) | |
362 | continue; | |
363 | hlist_del(entry); | |
364 | hlist_add_after(entry0, &pol->bydst); | |
365 | } | |
366 | entry0 = entry; | |
367 | } | |
368 | if (!hlist_empty(list)) { | |
369 | entry0 = NULL; | |
370 | goto redo; | |
2518c7c2 DM |
371 | } |
372 | } | |
373 | ||
374 | static void xfrm_idx_hash_transfer(struct hlist_head *list, | |
375 | struct hlist_head *nidxtable, | |
376 | unsigned int nhashmask) | |
377 | { | |
378 | struct hlist_node *entry, *tmp; | |
379 | struct xfrm_policy *pol; | |
380 | ||
381 | hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) { | |
382 | unsigned int h; | |
383 | ||
384 | h = __idx_hash(pol->index, nhashmask); | |
385 | hlist_add_head(&pol->byidx, nidxtable+h); | |
386 | } | |
387 | } | |
388 | ||
389 | static unsigned long xfrm_new_hash_mask(unsigned int old_hmask) | |
390 | { | |
391 | return ((old_hmask + 1) << 1) - 1; | |
392 | } | |
393 | ||
66caf628 | 394 | static void xfrm_bydst_resize(struct net *net, int dir) |
2518c7c2 | 395 | { |
66caf628 | 396 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
397 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
398 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
66caf628 | 399 | struct hlist_head *odst = net->xfrm.policy_bydst[dir].table; |
44e36b42 | 400 | struct hlist_head *ndst = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
401 | int i; |
402 | ||
403 | if (!ndst) | |
404 | return; | |
405 | ||
406 | write_lock_bh(&xfrm_policy_lock); | |
407 | ||
408 | for (i = hmask; i >= 0; i--) | |
409 | xfrm_dst_hash_transfer(odst + i, ndst, nhashmask); | |
410 | ||
66caf628 AD |
411 | net->xfrm.policy_bydst[dir].table = ndst; |
412 | net->xfrm.policy_bydst[dir].hmask = nhashmask; | |
2518c7c2 DM |
413 | |
414 | write_unlock_bh(&xfrm_policy_lock); | |
415 | ||
44e36b42 | 416 | xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
417 | } |
418 | ||
66caf628 | 419 | static void xfrm_byidx_resize(struct net *net, int total) |
2518c7c2 | 420 | { |
66caf628 | 421 | unsigned int hmask = net->xfrm.policy_idx_hmask; |
2518c7c2 DM |
422 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
423 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
66caf628 | 424 | struct hlist_head *oidx = net->xfrm.policy_byidx; |
44e36b42 | 425 | struct hlist_head *nidx = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
426 | int i; |
427 | ||
428 | if (!nidx) | |
429 | return; | |
430 | ||
431 | write_lock_bh(&xfrm_policy_lock); | |
432 | ||
433 | for (i = hmask; i >= 0; i--) | |
434 | xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask); | |
435 | ||
66caf628 AD |
436 | net->xfrm.policy_byidx = nidx; |
437 | net->xfrm.policy_idx_hmask = nhashmask; | |
2518c7c2 DM |
438 | |
439 | write_unlock_bh(&xfrm_policy_lock); | |
440 | ||
44e36b42 | 441 | xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
442 | } |
443 | ||
66caf628 | 444 | static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total) |
2518c7c2 | 445 | { |
66caf628 AD |
446 | unsigned int cnt = net->xfrm.policy_count[dir]; |
447 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; | |
2518c7c2 DM |
448 | |
449 | if (total) | |
450 | *total += cnt; | |
451 | ||
452 | if ((hmask + 1) < xfrm_policy_hashmax && | |
453 | cnt > hmask) | |
454 | return 1; | |
455 | ||
456 | return 0; | |
457 | } | |
458 | ||
66caf628 | 459 | static inline int xfrm_byidx_should_resize(struct net *net, int total) |
2518c7c2 | 460 | { |
66caf628 | 461 | unsigned int hmask = net->xfrm.policy_idx_hmask; |
2518c7c2 DM |
462 | |
463 | if ((hmask + 1) < xfrm_policy_hashmax && | |
464 | total > hmask) | |
465 | return 1; | |
466 | ||
467 | return 0; | |
468 | } | |
469 | ||
e071041b | 470 | void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si) |
ecfd6b18 JHS |
471 | { |
472 | read_lock_bh(&xfrm_policy_lock); | |
e071041b AD |
473 | si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN]; |
474 | si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT]; | |
475 | si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD]; | |
476 | si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX]; | |
477 | si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX]; | |
478 | si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX]; | |
479 | si->spdhcnt = net->xfrm.policy_idx_hmask; | |
ecfd6b18 JHS |
480 | si->spdhmcnt = xfrm_policy_hashmax; |
481 | read_unlock_bh(&xfrm_policy_lock); | |
482 | } | |
483 | EXPORT_SYMBOL(xfrm_spd_getinfo); | |
2518c7c2 | 484 | |
ecfd6b18 | 485 | static DEFINE_MUTEX(hash_resize_mutex); |
66caf628 | 486 | static void xfrm_hash_resize(struct work_struct *work) |
2518c7c2 | 487 | { |
66caf628 | 488 | struct net *net = container_of(work, struct net, xfrm.policy_hash_work); |
2518c7c2 DM |
489 | int dir, total; |
490 | ||
491 | mutex_lock(&hash_resize_mutex); | |
492 | ||
493 | total = 0; | |
494 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
66caf628 AD |
495 | if (xfrm_bydst_should_resize(net, dir, &total)) |
496 | xfrm_bydst_resize(net, dir); | |
2518c7c2 | 497 | } |
66caf628 AD |
498 | if (xfrm_byidx_should_resize(net, total)) |
499 | xfrm_byidx_resize(net, total); | |
2518c7c2 DM |
500 | |
501 | mutex_unlock(&hash_resize_mutex); | |
502 | } | |
503 | ||
1da177e4 LT |
504 | /* Generate new index... KAME seems to generate them ordered by cost |
505 | * of an absolute inpredictability of ordering of rules. This will not pass. */ | |
1121994c | 506 | static u32 xfrm_gen_index(struct net *net, int dir) |
1da177e4 | 507 | { |
1da177e4 LT |
508 | static u32 idx_generator; |
509 | ||
510 | for (;;) { | |
2518c7c2 DM |
511 | struct hlist_node *entry; |
512 | struct hlist_head *list; | |
513 | struct xfrm_policy *p; | |
514 | u32 idx; | |
515 | int found; | |
516 | ||
1da177e4 LT |
517 | idx = (idx_generator | dir); |
518 | idx_generator += 8; | |
519 | if (idx == 0) | |
520 | idx = 8; | |
1121994c | 521 | list = net->xfrm.policy_byidx + idx_hash(net, idx); |
2518c7c2 DM |
522 | found = 0; |
523 | hlist_for_each_entry(p, entry, list, byidx) { | |
524 | if (p->index == idx) { | |
525 | found = 1; | |
1da177e4 | 526 | break; |
2518c7c2 | 527 | } |
1da177e4 | 528 | } |
2518c7c2 | 529 | if (!found) |
1da177e4 LT |
530 | return idx; |
531 | } | |
532 | } | |
533 | ||
2518c7c2 DM |
534 | static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2) |
535 | { | |
536 | u32 *p1 = (u32 *) s1; | |
537 | u32 *p2 = (u32 *) s2; | |
538 | int len = sizeof(struct xfrm_selector) / sizeof(u32); | |
539 | int i; | |
540 | ||
541 | for (i = 0; i < len; i++) { | |
542 | if (p1[i] != p2[i]) | |
543 | return 1; | |
544 | } | |
545 | ||
546 | return 0; | |
547 | } | |
548 | ||
1da177e4 LT |
549 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) |
550 | { | |
1121994c | 551 | struct net *net = xp_net(policy); |
2518c7c2 DM |
552 | struct xfrm_policy *pol; |
553 | struct xfrm_policy *delpol; | |
554 | struct hlist_head *chain; | |
a6c7ab55 | 555 | struct hlist_node *entry, *newpos; |
34f8d884 | 556 | u32 mark = policy->mark.v & policy->mark.m; |
1da177e4 LT |
557 | |
558 | write_lock_bh(&xfrm_policy_lock); | |
1121994c | 559 | chain = policy_hash_bysel(net, &policy->selector, policy->family, dir); |
2518c7c2 DM |
560 | delpol = NULL; |
561 | newpos = NULL; | |
2518c7c2 | 562 | hlist_for_each_entry(pol, entry, chain, bydst) { |
a6c7ab55 | 563 | if (pol->type == policy->type && |
2518c7c2 | 564 | !selector_cmp(&pol->selector, &policy->selector) && |
34f8d884 | 565 | (mark & pol->mark.m) == pol->mark.v && |
a6c7ab55 HX |
566 | xfrm_sec_ctx_match(pol->security, policy->security) && |
567 | !WARN_ON(delpol)) { | |
1da177e4 LT |
568 | if (excl) { |
569 | write_unlock_bh(&xfrm_policy_lock); | |
570 | return -EEXIST; | |
571 | } | |
1da177e4 LT |
572 | delpol = pol; |
573 | if (policy->priority > pol->priority) | |
574 | continue; | |
575 | } else if (policy->priority >= pol->priority) { | |
a6c7ab55 | 576 | newpos = &pol->bydst; |
1da177e4 LT |
577 | continue; |
578 | } | |
1da177e4 LT |
579 | if (delpol) |
580 | break; | |
1da177e4 LT |
581 | } |
582 | if (newpos) | |
2518c7c2 DM |
583 | hlist_add_after(newpos, &policy->bydst); |
584 | else | |
585 | hlist_add_head(&policy->bydst, chain); | |
1da177e4 | 586 | xfrm_pol_hold(policy); |
1121994c | 587 | net->xfrm.policy_count[dir]++; |
1da177e4 | 588 | atomic_inc(&flow_cache_genid); |
29fa0b30 WY |
589 | if (delpol) |
590 | __xfrm_policy_unlink(delpol, dir); | |
1121994c AD |
591 | policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir); |
592 | hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index)); | |
9d729f72 | 593 | policy->curlft.add_time = get_seconds(); |
1da177e4 LT |
594 | policy->curlft.use_time = 0; |
595 | if (!mod_timer(&policy->timer, jiffies + HZ)) | |
596 | xfrm_pol_hold(policy); | |
1121994c | 597 | list_add(&policy->walk.all, &net->xfrm.policy_all); |
1da177e4 LT |
598 | write_unlock_bh(&xfrm_policy_lock); |
599 | ||
9b78a82c | 600 | if (delpol) |
1da177e4 | 601 | xfrm_policy_kill(delpol); |
1121994c AD |
602 | else if (xfrm_bydst_should_resize(net, dir, NULL)) |
603 | schedule_work(&net->xfrm.policy_hash_work); | |
9b78a82c | 604 | |
1da177e4 LT |
605 | return 0; |
606 | } | |
607 | EXPORT_SYMBOL(xfrm_policy_insert); | |
608 | ||
8ca2e93b JHS |
609 | struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type, |
610 | int dir, struct xfrm_selector *sel, | |
ef41aaa0 EP |
611 | struct xfrm_sec_ctx *ctx, int delete, |
612 | int *err) | |
1da177e4 | 613 | { |
2518c7c2 DM |
614 | struct xfrm_policy *pol, *ret; |
615 | struct hlist_head *chain; | |
616 | struct hlist_node *entry; | |
1da177e4 | 617 | |
ef41aaa0 | 618 | *err = 0; |
1da177e4 | 619 | write_lock_bh(&xfrm_policy_lock); |
8d1211a6 | 620 | chain = policy_hash_bysel(net, sel, sel->family, dir); |
2518c7c2 DM |
621 | ret = NULL; |
622 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
623 | if (pol->type == type && | |
34f8d884 | 624 | (mark & pol->mark.m) == pol->mark.v && |
2518c7c2 DM |
625 | !selector_cmp(sel, &pol->selector) && |
626 | xfrm_sec_ctx_match(ctx, pol->security)) { | |
1da177e4 | 627 | xfrm_pol_hold(pol); |
2518c7c2 | 628 | if (delete) { |
03e1ad7b PM |
629 | *err = security_xfrm_policy_delete( |
630 | pol->security); | |
ef41aaa0 EP |
631 | if (*err) { |
632 | write_unlock_bh(&xfrm_policy_lock); | |
633 | return pol; | |
634 | } | |
29fa0b30 | 635 | __xfrm_policy_unlink(pol, dir); |
2518c7c2 DM |
636 | } |
637 | ret = pol; | |
1da177e4 LT |
638 | break; |
639 | } | |
640 | } | |
641 | write_unlock_bh(&xfrm_policy_lock); | |
642 | ||
fe1a5f03 | 643 | if (ret && delete) |
2518c7c2 | 644 | xfrm_policy_kill(ret); |
2518c7c2 | 645 | return ret; |
1da177e4 | 646 | } |
df71837d | 647 | EXPORT_SYMBOL(xfrm_policy_bysel_ctx); |
1da177e4 | 648 | |
8ca2e93b JHS |
649 | struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type, |
650 | int dir, u32 id, int delete, int *err) | |
1da177e4 | 651 | { |
2518c7c2 DM |
652 | struct xfrm_policy *pol, *ret; |
653 | struct hlist_head *chain; | |
654 | struct hlist_node *entry; | |
1da177e4 | 655 | |
b5505c6e HX |
656 | *err = -ENOENT; |
657 | if (xfrm_policy_id2dir(id) != dir) | |
658 | return NULL; | |
659 | ||
ef41aaa0 | 660 | *err = 0; |
1da177e4 | 661 | write_lock_bh(&xfrm_policy_lock); |
8d1211a6 | 662 | chain = net->xfrm.policy_byidx + idx_hash(net, id); |
2518c7c2 DM |
663 | ret = NULL; |
664 | hlist_for_each_entry(pol, entry, chain, byidx) { | |
34f8d884 JHS |
665 | if (pol->type == type && pol->index == id && |
666 | (mark & pol->mark.m) == pol->mark.v) { | |
1da177e4 | 667 | xfrm_pol_hold(pol); |
2518c7c2 | 668 | if (delete) { |
03e1ad7b PM |
669 | *err = security_xfrm_policy_delete( |
670 | pol->security); | |
ef41aaa0 EP |
671 | if (*err) { |
672 | write_unlock_bh(&xfrm_policy_lock); | |
673 | return pol; | |
674 | } | |
29fa0b30 | 675 | __xfrm_policy_unlink(pol, dir); |
2518c7c2 DM |
676 | } |
677 | ret = pol; | |
1da177e4 LT |
678 | break; |
679 | } | |
680 | } | |
681 | write_unlock_bh(&xfrm_policy_lock); | |
682 | ||
fe1a5f03 | 683 | if (ret && delete) |
2518c7c2 | 684 | xfrm_policy_kill(ret); |
2518c7c2 | 685 | return ret; |
1da177e4 LT |
686 | } |
687 | EXPORT_SYMBOL(xfrm_policy_byid); | |
688 | ||
4aa2e62c JL |
689 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
690 | static inline int | |
33ffbbd5 | 691 | xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info) |
1da177e4 | 692 | { |
4aa2e62c JL |
693 | int dir, err = 0; |
694 | ||
695 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { | |
696 | struct xfrm_policy *pol; | |
697 | struct hlist_node *entry; | |
698 | int i; | |
699 | ||
700 | hlist_for_each_entry(pol, entry, | |
33ffbbd5 | 701 | &net->xfrm.policy_inexact[dir], bydst) { |
4aa2e62c JL |
702 | if (pol->type != type) |
703 | continue; | |
03e1ad7b | 704 | err = security_xfrm_policy_delete(pol->security); |
4aa2e62c | 705 | if (err) { |
ab5f5e8b JL |
706 | xfrm_audit_policy_delete(pol, 0, |
707 | audit_info->loginuid, | |
2532386f | 708 | audit_info->sessionid, |
ab5f5e8b | 709 | audit_info->secid); |
4aa2e62c JL |
710 | return err; |
711 | } | |
7dc12d6d | 712 | } |
33ffbbd5 | 713 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { |
4aa2e62c | 714 | hlist_for_each_entry(pol, entry, |
33ffbbd5 | 715 | net->xfrm.policy_bydst[dir].table + i, |
4aa2e62c JL |
716 | bydst) { |
717 | if (pol->type != type) | |
718 | continue; | |
03e1ad7b PM |
719 | err = security_xfrm_policy_delete( |
720 | pol->security); | |
4aa2e62c | 721 | if (err) { |
ab5f5e8b JL |
722 | xfrm_audit_policy_delete(pol, 0, |
723 | audit_info->loginuid, | |
2532386f | 724 | audit_info->sessionid, |
ab5f5e8b | 725 | audit_info->secid); |
4aa2e62c JL |
726 | return err; |
727 | } | |
728 | } | |
729 | } | |
730 | } | |
731 | return err; | |
732 | } | |
733 | #else | |
734 | static inline int | |
33ffbbd5 | 735 | xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info) |
4aa2e62c JL |
736 | { |
737 | return 0; | |
738 | } | |
739 | #endif | |
740 | ||
33ffbbd5 | 741 | int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info) |
4aa2e62c | 742 | { |
2f1eb65f | 743 | int dir, err = 0, cnt = 0; |
1da177e4 LT |
744 | |
745 | write_lock_bh(&xfrm_policy_lock); | |
4aa2e62c | 746 | |
33ffbbd5 | 747 | err = xfrm_policy_flush_secctx_check(net, type, audit_info); |
4aa2e62c JL |
748 | if (err) |
749 | goto out; | |
750 | ||
1da177e4 | 751 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
2518c7c2 DM |
752 | struct xfrm_policy *pol; |
753 | struct hlist_node *entry; | |
29fa0b30 | 754 | int i; |
2518c7c2 DM |
755 | |
756 | again1: | |
757 | hlist_for_each_entry(pol, entry, | |
33ffbbd5 | 758 | &net->xfrm.policy_inexact[dir], bydst) { |
2518c7c2 DM |
759 | if (pol->type != type) |
760 | continue; | |
ea2dea9d | 761 | __xfrm_policy_unlink(pol, dir); |
1da177e4 | 762 | write_unlock_bh(&xfrm_policy_lock); |
ea2dea9d | 763 | cnt++; |
1da177e4 | 764 | |
ab5f5e8b | 765 | xfrm_audit_policy_delete(pol, 1, audit_info->loginuid, |
2532386f | 766 | audit_info->sessionid, |
ab5f5e8b | 767 | audit_info->secid); |
161a09e7 | 768 | |
2518c7c2 | 769 | xfrm_policy_kill(pol); |
1da177e4 LT |
770 | |
771 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
772 | goto again1; |
773 | } | |
774 | ||
33ffbbd5 | 775 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { |
2518c7c2 DM |
776 | again2: |
777 | hlist_for_each_entry(pol, entry, | |
33ffbbd5 | 778 | net->xfrm.policy_bydst[dir].table + i, |
2518c7c2 DM |
779 | bydst) { |
780 | if (pol->type != type) | |
781 | continue; | |
ea2dea9d | 782 | __xfrm_policy_unlink(pol, dir); |
2518c7c2 | 783 | write_unlock_bh(&xfrm_policy_lock); |
ea2dea9d | 784 | cnt++; |
2518c7c2 | 785 | |
ab5f5e8b JL |
786 | xfrm_audit_policy_delete(pol, 1, |
787 | audit_info->loginuid, | |
2532386f | 788 | audit_info->sessionid, |
ab5f5e8b | 789 | audit_info->secid); |
2518c7c2 DM |
790 | xfrm_policy_kill(pol); |
791 | ||
792 | write_lock_bh(&xfrm_policy_lock); | |
793 | goto again2; | |
794 | } | |
1da177e4 | 795 | } |
2518c7c2 | 796 | |
1da177e4 | 797 | } |
2f1eb65f JHS |
798 | if (!cnt) |
799 | err = -ESRCH; | |
4aa2e62c | 800 | out: |
1da177e4 | 801 | write_unlock_bh(&xfrm_policy_lock); |
4aa2e62c | 802 | return err; |
1da177e4 LT |
803 | } |
804 | EXPORT_SYMBOL(xfrm_policy_flush); | |
805 | ||
cdcbca7c | 806 | int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, |
4c563f76 | 807 | int (*func)(struct xfrm_policy *, int, int, void*), |
1da177e4 LT |
808 | void *data) |
809 | { | |
12a169e7 HX |
810 | struct xfrm_policy *pol; |
811 | struct xfrm_policy_walk_entry *x; | |
4c563f76 TT |
812 | int error = 0; |
813 | ||
814 | if (walk->type >= XFRM_POLICY_TYPE_MAX && | |
815 | walk->type != XFRM_POLICY_TYPE_ANY) | |
816 | return -EINVAL; | |
1da177e4 | 817 | |
12a169e7 | 818 | if (list_empty(&walk->walk.all) && walk->seq != 0) |
4c563f76 TT |
819 | return 0; |
820 | ||
12a169e7 HX |
821 | write_lock_bh(&xfrm_policy_lock); |
822 | if (list_empty(&walk->walk.all)) | |
cdcbca7c | 823 | x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all); |
12a169e7 HX |
824 | else |
825 | x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all); | |
cdcbca7c | 826 | list_for_each_entry_from(x, &net->xfrm.policy_all, all) { |
12a169e7 | 827 | if (x->dead) |
4c563f76 | 828 | continue; |
12a169e7 HX |
829 | pol = container_of(x, struct xfrm_policy, walk); |
830 | if (walk->type != XFRM_POLICY_TYPE_ANY && | |
831 | walk->type != pol->type) | |
832 | continue; | |
833 | error = func(pol, xfrm_policy_id2dir(pol->index), | |
834 | walk->seq, data); | |
835 | if (error) { | |
836 | list_move_tail(&walk->walk.all, &x->all); | |
837 | goto out; | |
2518c7c2 | 838 | } |
12a169e7 | 839 | walk->seq++; |
1da177e4 | 840 | } |
12a169e7 | 841 | if (walk->seq == 0) { |
baf5d743 JHS |
842 | error = -ENOENT; |
843 | goto out; | |
844 | } | |
12a169e7 | 845 | list_del_init(&walk->walk.all); |
1da177e4 | 846 | out: |
12a169e7 | 847 | write_unlock_bh(&xfrm_policy_lock); |
1da177e4 LT |
848 | return error; |
849 | } | |
850 | EXPORT_SYMBOL(xfrm_policy_walk); | |
851 | ||
12a169e7 HX |
852 | void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type) |
853 | { | |
854 | INIT_LIST_HEAD(&walk->walk.all); | |
855 | walk->walk.dead = 1; | |
856 | walk->type = type; | |
857 | walk->seq = 0; | |
858 | } | |
859 | EXPORT_SYMBOL(xfrm_policy_walk_init); | |
860 | ||
861 | void xfrm_policy_walk_done(struct xfrm_policy_walk *walk) | |
862 | { | |
863 | if (list_empty(&walk->walk.all)) | |
864 | return; | |
865 | ||
866 | write_lock_bh(&xfrm_policy_lock); | |
867 | list_del(&walk->walk.all); | |
868 | write_unlock_bh(&xfrm_policy_lock); | |
869 | } | |
870 | EXPORT_SYMBOL(xfrm_policy_walk_done); | |
871 | ||
134b0fc5 JM |
872 | /* |
873 | * Find policy to apply to this flow. | |
874 | * | |
875 | * Returns 0 if policy found, else an -errno. | |
876 | */ | |
f299d557 DM |
877 | static int xfrm_policy_match(const struct xfrm_policy *pol, |
878 | const struct flowi *fl, | |
2518c7c2 | 879 | u8 type, u16 family, int dir) |
1da177e4 | 880 | { |
f299d557 | 881 | const struct xfrm_selector *sel = &pol->selector; |
bc9b35ad DM |
882 | int ret = -ESRCH; |
883 | bool match; | |
1da177e4 | 884 | |
2518c7c2 | 885 | if (pol->family != family || |
1d28f42c | 886 | (fl->flowi_mark & pol->mark.m) != pol->mark.v || |
2518c7c2 | 887 | pol->type != type) |
134b0fc5 | 888 | return ret; |
1da177e4 | 889 | |
2518c7c2 | 890 | match = xfrm_selector_match(sel, fl, family); |
134b0fc5 | 891 | if (match) |
1d28f42c | 892 | ret = security_xfrm_policy_lookup(pol->security, fl->flowi_secid, |
03e1ad7b | 893 | dir); |
2518c7c2 | 894 | |
134b0fc5 | 895 | return ret; |
2518c7c2 | 896 | } |
1da177e4 | 897 | |
52479b62 | 898 | static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type, |
062cdb43 | 899 | const struct flowi *fl, |
2518c7c2 DM |
900 | u16 family, u8 dir) |
901 | { | |
134b0fc5 | 902 | int err; |
2518c7c2 | 903 | struct xfrm_policy *pol, *ret; |
0b597e7e | 904 | const xfrm_address_t *daddr, *saddr; |
2518c7c2 DM |
905 | struct hlist_node *entry; |
906 | struct hlist_head *chain; | |
acba48e1 | 907 | u32 priority = ~0U; |
df71837d | 908 | |
2518c7c2 DM |
909 | daddr = xfrm_flowi_daddr(fl, family); |
910 | saddr = xfrm_flowi_saddr(fl, family); | |
911 | if (unlikely(!daddr || !saddr)) | |
912 | return NULL; | |
913 | ||
914 | read_lock_bh(&xfrm_policy_lock); | |
52479b62 | 915 | chain = policy_hash_direct(net, daddr, saddr, family, dir); |
2518c7c2 DM |
916 | ret = NULL; |
917 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
918 | err = xfrm_policy_match(pol, fl, type, family, dir); |
919 | if (err) { | |
920 | if (err == -ESRCH) | |
921 | continue; | |
922 | else { | |
923 | ret = ERR_PTR(err); | |
924 | goto fail; | |
925 | } | |
926 | } else { | |
2518c7c2 | 927 | ret = pol; |
acba48e1 | 928 | priority = ret->priority; |
2518c7c2 DM |
929 | break; |
930 | } | |
931 | } | |
52479b62 | 932 | chain = &net->xfrm.policy_inexact[dir]; |
acba48e1 | 933 | hlist_for_each_entry(pol, entry, chain, bydst) { |
134b0fc5 JM |
934 | err = xfrm_policy_match(pol, fl, type, family, dir); |
935 | if (err) { | |
936 | if (err == -ESRCH) | |
937 | continue; | |
938 | else { | |
939 | ret = ERR_PTR(err); | |
940 | goto fail; | |
941 | } | |
942 | } else if (pol->priority < priority) { | |
acba48e1 DM |
943 | ret = pol; |
944 | break; | |
1da177e4 LT |
945 | } |
946 | } | |
acba48e1 DM |
947 | if (ret) |
948 | xfrm_pol_hold(ret); | |
134b0fc5 | 949 | fail: |
1da177e4 | 950 | read_unlock_bh(&xfrm_policy_lock); |
4e81bb83 | 951 | |
2518c7c2 | 952 | return ret; |
4e81bb83 MN |
953 | } |
954 | ||
80c802f3 | 955 | static struct xfrm_policy * |
73ff93cd | 956 | __xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir) |
80c802f3 TT |
957 | { |
958 | #ifdef CONFIG_XFRM_SUB_POLICY | |
959 | struct xfrm_policy *pol; | |
960 | ||
961 | pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir); | |
962 | if (pol != NULL) | |
963 | return pol; | |
964 | #endif | |
965 | return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir); | |
966 | } | |
967 | ||
fe1a5f03 | 968 | static struct flow_cache_object * |
dee9f4bc | 969 | xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, |
fe1a5f03 | 970 | u8 dir, struct flow_cache_object *old_obj, void *ctx) |
4e81bb83 MN |
971 | { |
972 | struct xfrm_policy *pol; | |
fe1a5f03 TT |
973 | |
974 | if (old_obj) | |
975 | xfrm_pol_put(container_of(old_obj, struct xfrm_policy, flo)); | |
4e81bb83 | 976 | |
80c802f3 TT |
977 | pol = __xfrm_policy_lookup(net, fl, family, dir); |
978 | if (IS_ERR_OR_NULL(pol)) | |
fe1a5f03 | 979 | return ERR_CAST(pol); |
fe1a5f03 | 980 | |
fe1a5f03 TT |
981 | /* Resolver returns two references: |
982 | * one for cache and one for caller of flow_cache_lookup() */ | |
983 | xfrm_pol_hold(pol); | |
984 | ||
985 | return &pol->flo; | |
1da177e4 LT |
986 | } |
987 | ||
df71837d TJ |
988 | static inline int policy_to_flow_dir(int dir) |
989 | { | |
990 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
a716c119 YH |
991 | XFRM_POLICY_OUT == FLOW_DIR_OUT && |
992 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
993 | return dir; | |
994 | switch (dir) { | |
995 | default: | |
996 | case XFRM_POLICY_IN: | |
997 | return FLOW_DIR_IN; | |
998 | case XFRM_POLICY_OUT: | |
999 | return FLOW_DIR_OUT; | |
1000 | case XFRM_POLICY_FWD: | |
1001 | return FLOW_DIR_FWD; | |
3ff50b79 | 1002 | } |
df71837d TJ |
1003 | } |
1004 | ||
dee9f4bc DM |
1005 | static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, |
1006 | const struct flowi *fl) | |
1da177e4 LT |
1007 | { |
1008 | struct xfrm_policy *pol; | |
1009 | ||
1010 | read_lock_bh(&xfrm_policy_lock); | |
1011 | if ((pol = sk->sk_policy[dir]) != NULL) { | |
bc9b35ad DM |
1012 | bool match = xfrm_selector_match(&pol->selector, fl, |
1013 | sk->sk_family); | |
a716c119 | 1014 | int err = 0; |
df71837d | 1015 | |
3bccfbc7 | 1016 | if (match) { |
34f8d884 JHS |
1017 | if ((sk->sk_mark & pol->mark.m) != pol->mark.v) { |
1018 | pol = NULL; | |
1019 | goto out; | |
1020 | } | |
03e1ad7b | 1021 | err = security_xfrm_policy_lookup(pol->security, |
1d28f42c | 1022 | fl->flowi_secid, |
03e1ad7b | 1023 | policy_to_flow_dir(dir)); |
3bccfbc7 VY |
1024 | if (!err) |
1025 | xfrm_pol_hold(pol); | |
1026 | else if (err == -ESRCH) | |
1027 | pol = NULL; | |
1028 | else | |
1029 | pol = ERR_PTR(err); | |
1030 | } else | |
1da177e4 LT |
1031 | pol = NULL; |
1032 | } | |
34f8d884 | 1033 | out: |
1da177e4 LT |
1034 | read_unlock_bh(&xfrm_policy_lock); |
1035 | return pol; | |
1036 | } | |
1037 | ||
1038 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) | |
1039 | { | |
98806f75 | 1040 | struct net *net = xp_net(pol); |
1121994c | 1041 | struct hlist_head *chain = policy_hash_bysel(net, &pol->selector, |
2518c7c2 | 1042 | pol->family, dir); |
4e81bb83 | 1043 | |
98806f75 | 1044 | list_add(&pol->walk.all, &net->xfrm.policy_all); |
2518c7c2 | 1045 | hlist_add_head(&pol->bydst, chain); |
e92303f8 | 1046 | hlist_add_head(&pol->byidx, net->xfrm.policy_byidx+idx_hash(net, pol->index)); |
98806f75 | 1047 | net->xfrm.policy_count[dir]++; |
1da177e4 | 1048 | xfrm_pol_hold(pol); |
2518c7c2 | 1049 | |
98806f75 AD |
1050 | if (xfrm_bydst_should_resize(net, dir, NULL)) |
1051 | schedule_work(&net->xfrm.policy_hash_work); | |
1da177e4 LT |
1052 | } |
1053 | ||
1054 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, | |
1055 | int dir) | |
1056 | { | |
98806f75 AD |
1057 | struct net *net = xp_net(pol); |
1058 | ||
2518c7c2 DM |
1059 | if (hlist_unhashed(&pol->bydst)) |
1060 | return NULL; | |
1da177e4 | 1061 | |
2518c7c2 DM |
1062 | hlist_del(&pol->bydst); |
1063 | hlist_del(&pol->byidx); | |
12a169e7 | 1064 | list_del(&pol->walk.all); |
98806f75 | 1065 | net->xfrm.policy_count[dir]--; |
2518c7c2 DM |
1066 | |
1067 | return pol; | |
1da177e4 LT |
1068 | } |
1069 | ||
4666faab | 1070 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir) |
1da177e4 LT |
1071 | { |
1072 | write_lock_bh(&xfrm_policy_lock); | |
1073 | pol = __xfrm_policy_unlink(pol, dir); | |
1074 | write_unlock_bh(&xfrm_policy_lock); | |
1075 | if (pol) { | |
1da177e4 | 1076 | xfrm_policy_kill(pol); |
4666faab | 1077 | return 0; |
1da177e4 | 1078 | } |
4666faab | 1079 | return -ENOENT; |
1da177e4 | 1080 | } |
a70fcb0b | 1081 | EXPORT_SYMBOL(xfrm_policy_delete); |
1da177e4 LT |
1082 | |
1083 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) | |
1084 | { | |
1121994c | 1085 | struct net *net = xp_net(pol); |
1da177e4 LT |
1086 | struct xfrm_policy *old_pol; |
1087 | ||
4e81bb83 MN |
1088 | #ifdef CONFIG_XFRM_SUB_POLICY |
1089 | if (pol && pol->type != XFRM_POLICY_TYPE_MAIN) | |
1090 | return -EINVAL; | |
1091 | #endif | |
1092 | ||
1da177e4 LT |
1093 | write_lock_bh(&xfrm_policy_lock); |
1094 | old_pol = sk->sk_policy[dir]; | |
1095 | sk->sk_policy[dir] = pol; | |
1096 | if (pol) { | |
9d729f72 | 1097 | pol->curlft.add_time = get_seconds(); |
1121994c | 1098 | pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir); |
1da177e4 LT |
1099 | __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir); |
1100 | } | |
1101 | if (old_pol) | |
ea2dea9d TT |
1102 | /* Unlinking succeeds always. This is the only function |
1103 | * allowed to delete or replace socket policy. | |
1104 | */ | |
1da177e4 LT |
1105 | __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir); |
1106 | write_unlock_bh(&xfrm_policy_lock); | |
1107 | ||
1108 | if (old_pol) { | |
1109 | xfrm_policy_kill(old_pol); | |
1110 | } | |
1111 | return 0; | |
1112 | } | |
1113 | ||
d3e40a9f | 1114 | static struct xfrm_policy *clone_policy(const struct xfrm_policy *old, int dir) |
1da177e4 | 1115 | { |
0331b1f3 | 1116 | struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC); |
1da177e4 LT |
1117 | |
1118 | if (newp) { | |
1119 | newp->selector = old->selector; | |
03e1ad7b PM |
1120 | if (security_xfrm_policy_clone(old->security, |
1121 | &newp->security)) { | |
df71837d TJ |
1122 | kfree(newp); |
1123 | return NULL; /* ENOMEM */ | |
1124 | } | |
1da177e4 LT |
1125 | newp->lft = old->lft; |
1126 | newp->curlft = old->curlft; | |
fb977e2c | 1127 | newp->mark = old->mark; |
1da177e4 LT |
1128 | newp->action = old->action; |
1129 | newp->flags = old->flags; | |
1130 | newp->xfrm_nr = old->xfrm_nr; | |
1131 | newp->index = old->index; | |
4e81bb83 | 1132 | newp->type = old->type; |
1da177e4 LT |
1133 | memcpy(newp->xfrm_vec, old->xfrm_vec, |
1134 | newp->xfrm_nr*sizeof(struct xfrm_tmpl)); | |
1135 | write_lock_bh(&xfrm_policy_lock); | |
1136 | __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir); | |
1137 | write_unlock_bh(&xfrm_policy_lock); | |
1138 | xfrm_pol_put(newp); | |
1139 | } | |
1140 | return newp; | |
1141 | } | |
1142 | ||
1143 | int __xfrm_sk_clone_policy(struct sock *sk) | |
1144 | { | |
1145 | struct xfrm_policy *p0 = sk->sk_policy[0], | |
1146 | *p1 = sk->sk_policy[1]; | |
1147 | ||
1148 | sk->sk_policy[0] = sk->sk_policy[1] = NULL; | |
1149 | if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL) | |
1150 | return -ENOMEM; | |
1151 | if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL) | |
1152 | return -ENOMEM; | |
1153 | return 0; | |
1154 | } | |
1155 | ||
a1e59abf | 1156 | static int |
fbda33b2 | 1157 | xfrm_get_saddr(struct net *net, xfrm_address_t *local, xfrm_address_t *remote, |
a1e59abf PM |
1158 | unsigned short family) |
1159 | { | |
1160 | int err; | |
1161 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1162 | ||
1163 | if (unlikely(afinfo == NULL)) | |
1164 | return -EINVAL; | |
fbda33b2 | 1165 | err = afinfo->get_saddr(net, local, remote); |
a1e59abf PM |
1166 | xfrm_policy_put_afinfo(afinfo); |
1167 | return err; | |
1168 | } | |
1169 | ||
1da177e4 LT |
1170 | /* Resolve list of templates for the flow, given policy. */ |
1171 | ||
1172 | static int | |
a6c2e611 DM |
1173 | xfrm_tmpl_resolve_one(struct xfrm_policy *policy, const struct flowi *fl, |
1174 | struct xfrm_state **xfrm, unsigned short family) | |
1da177e4 | 1175 | { |
fbda33b2 | 1176 | struct net *net = xp_net(policy); |
1da177e4 LT |
1177 | int nx; |
1178 | int i, error; | |
1179 | xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); | |
1180 | xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); | |
a1e59abf | 1181 | xfrm_address_t tmp; |
1da177e4 LT |
1182 | |
1183 | for (nx=0, i = 0; i < policy->xfrm_nr; i++) { | |
1184 | struct xfrm_state *x; | |
1185 | xfrm_address_t *remote = daddr; | |
1186 | xfrm_address_t *local = saddr; | |
1187 | struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; | |
1188 | ||
48b8d783 JK |
1189 | if (tmpl->mode == XFRM_MODE_TUNNEL || |
1190 | tmpl->mode == XFRM_MODE_BEET) { | |
1da177e4 LT |
1191 | remote = &tmpl->id.daddr; |
1192 | local = &tmpl->saddr; | |
8444cf71 TE |
1193 | if (xfrm_addr_any(local, tmpl->encap_family)) { |
1194 | error = xfrm_get_saddr(net, &tmp, remote, tmpl->encap_family); | |
a1e59abf PM |
1195 | if (error) |
1196 | goto fail; | |
1197 | local = &tmp; | |
1198 | } | |
1da177e4 LT |
1199 | } |
1200 | ||
1201 | x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); | |
1202 | ||
1203 | if (x && x->km.state == XFRM_STATE_VALID) { | |
1204 | xfrm[nx++] = x; | |
1205 | daddr = remote; | |
1206 | saddr = local; | |
1207 | continue; | |
1208 | } | |
1209 | if (x) { | |
1210 | error = (x->km.state == XFRM_STATE_ERROR ? | |
1211 | -EINVAL : -EAGAIN); | |
1212 | xfrm_state_put(x); | |
1213 | } | |
a4322266 | 1214 | else if (error == -ESRCH) |
1215 | error = -EAGAIN; | |
1da177e4 LT |
1216 | |
1217 | if (!tmpl->optional) | |
1218 | goto fail; | |
1219 | } | |
1220 | return nx; | |
1221 | ||
1222 | fail: | |
1223 | for (nx--; nx>=0; nx--) | |
1224 | xfrm_state_put(xfrm[nx]); | |
1225 | return error; | |
1226 | } | |
1227 | ||
4e81bb83 | 1228 | static int |
a6c2e611 DM |
1229 | xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, const struct flowi *fl, |
1230 | struct xfrm_state **xfrm, unsigned short family) | |
4e81bb83 | 1231 | { |
41a49cc3 MN |
1232 | struct xfrm_state *tp[XFRM_MAX_DEPTH]; |
1233 | struct xfrm_state **tpp = (npols > 1) ? tp : xfrm; | |
4e81bb83 MN |
1234 | int cnx = 0; |
1235 | int error; | |
1236 | int ret; | |
1237 | int i; | |
1238 | ||
1239 | for (i = 0; i < npols; i++) { | |
1240 | if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
1241 | error = -ENOBUFS; | |
1242 | goto fail; | |
1243 | } | |
41a49cc3 MN |
1244 | |
1245 | ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family); | |
4e81bb83 MN |
1246 | if (ret < 0) { |
1247 | error = ret; | |
1248 | goto fail; | |
1249 | } else | |
1250 | cnx += ret; | |
1251 | } | |
1252 | ||
41a49cc3 MN |
1253 | /* found states are sorted for outbound processing */ |
1254 | if (npols > 1) | |
1255 | xfrm_state_sort(xfrm, tpp, cnx, family); | |
1256 | ||
4e81bb83 MN |
1257 | return cnx; |
1258 | ||
1259 | fail: | |
1260 | for (cnx--; cnx>=0; cnx--) | |
41a49cc3 | 1261 | xfrm_state_put(tpp[cnx]); |
4e81bb83 MN |
1262 | return error; |
1263 | ||
1264 | } | |
1265 | ||
1da177e4 LT |
1266 | /* Check that the bundle accepts the flow and its components are |
1267 | * still valid. | |
1268 | */ | |
1269 | ||
05d84025 | 1270 | static inline int xfrm_get_tos(const struct flowi *fl, int family) |
25ee3286 HX |
1271 | { |
1272 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1273 | int tos; | |
1da177e4 | 1274 | |
25ee3286 HX |
1275 | if (!afinfo) |
1276 | return -EINVAL; | |
1277 | ||
1278 | tos = afinfo->get_tos(fl); | |
1279 | ||
1280 | xfrm_policy_put_afinfo(afinfo); | |
1281 | ||
1282 | return tos; | |
1283 | } | |
1284 | ||
80c802f3 TT |
1285 | static struct flow_cache_object *xfrm_bundle_flo_get(struct flow_cache_object *flo) |
1286 | { | |
1287 | struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); | |
1288 | struct dst_entry *dst = &xdst->u.dst; | |
1289 | ||
1290 | if (xdst->route == NULL) { | |
1291 | /* Dummy bundle - if it has xfrms we were not | |
1292 | * able to build bundle as template resolution failed. | |
1293 | * It means we need to try again resolving. */ | |
1294 | if (xdst->num_xfrms > 0) | |
1295 | return NULL; | |
1296 | } else { | |
1297 | /* Real bundle */ | |
1298 | if (stale_bundle(dst)) | |
1299 | return NULL; | |
1300 | } | |
1301 | ||
1302 | dst_hold(dst); | |
1303 | return flo; | |
1304 | } | |
1305 | ||
1306 | static int xfrm_bundle_flo_check(struct flow_cache_object *flo) | |
1307 | { | |
1308 | struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); | |
1309 | struct dst_entry *dst = &xdst->u.dst; | |
1310 | ||
1311 | if (!xdst->route) | |
1312 | return 0; | |
1313 | if (stale_bundle(dst)) | |
1314 | return 0; | |
1315 | ||
1316 | return 1; | |
1317 | } | |
1318 | ||
1319 | static void xfrm_bundle_flo_delete(struct flow_cache_object *flo) | |
1320 | { | |
1321 | struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); | |
1322 | struct dst_entry *dst = &xdst->u.dst; | |
1323 | ||
1324 | dst_free(dst); | |
1325 | } | |
1326 | ||
1327 | static const struct flow_cache_ops xfrm_bundle_fc_ops = { | |
1328 | .get = xfrm_bundle_flo_get, | |
1329 | .check = xfrm_bundle_flo_check, | |
1330 | .delete = xfrm_bundle_flo_delete, | |
1331 | }; | |
1332 | ||
d7c7544c | 1333 | static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family) |
1da177e4 | 1334 | { |
1da177e4 | 1335 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
d7c7544c | 1336 | struct dst_ops *dst_ops; |
25ee3286 HX |
1337 | struct xfrm_dst *xdst; |
1338 | ||
1339 | if (!afinfo) | |
1340 | return ERR_PTR(-EINVAL); | |
1341 | ||
d7c7544c AD |
1342 | switch (family) { |
1343 | case AF_INET: | |
1344 | dst_ops = &net->xfrm.xfrm4_dst_ops; | |
1345 | break; | |
dfd56b8b | 1346 | #if IS_ENABLED(CONFIG_IPV6) |
d7c7544c AD |
1347 | case AF_INET6: |
1348 | dst_ops = &net->xfrm.xfrm6_dst_ops; | |
1349 | break; | |
1350 | #endif | |
1351 | default: | |
1352 | BUG(); | |
1353 | } | |
f5b0a874 | 1354 | xdst = dst_alloc(dst_ops, NULL, 0, DST_OBSOLETE_NONE, 0); |
25ee3286 | 1355 | |
d4cae562 | 1356 | if (likely(xdst)) { |
141e369d SK |
1357 | struct dst_entry *dst = &xdst->u.dst; |
1358 | ||
1359 | memset(dst + 1, 0, sizeof(*xdst) - sizeof(*dst)); | |
0b150932 | 1360 | xdst->flo.ops = &xfrm_bundle_fc_ops; |
9d7b0fc1 PM |
1361 | if (afinfo->init_dst) |
1362 | afinfo->init_dst(net, xdst); | |
d4cae562 | 1363 | } else |
0b150932 | 1364 | xdst = ERR_PTR(-ENOBUFS); |
80c802f3 | 1365 | |
d4cae562 MB |
1366 | xfrm_policy_put_afinfo(afinfo); |
1367 | ||
25ee3286 HX |
1368 | return xdst; |
1369 | } | |
1370 | ||
a1b05140 MN |
1371 | static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst, |
1372 | int nfheader_len) | |
1373 | { | |
1374 | struct xfrm_policy_afinfo *afinfo = | |
1375 | xfrm_policy_get_afinfo(dst->ops->family); | |
1376 | int err; | |
1377 | ||
1378 | if (!afinfo) | |
1379 | return -EINVAL; | |
1380 | ||
1381 | err = afinfo->init_path(path, dst, nfheader_len); | |
1382 | ||
1383 | xfrm_policy_put_afinfo(afinfo); | |
1384 | ||
1385 | return err; | |
1386 | } | |
1387 | ||
87c1e12b | 1388 | static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev, |
0c7b3eef | 1389 | const struct flowi *fl) |
25ee3286 HX |
1390 | { |
1391 | struct xfrm_policy_afinfo *afinfo = | |
1392 | xfrm_policy_get_afinfo(xdst->u.dst.ops->family); | |
1393 | int err; | |
1394 | ||
1395 | if (!afinfo) | |
1da177e4 | 1396 | return -EINVAL; |
25ee3286 | 1397 | |
87c1e12b | 1398 | err = afinfo->fill_dst(xdst, dev, fl); |
25ee3286 | 1399 | |
1da177e4 | 1400 | xfrm_policy_put_afinfo(afinfo); |
25ee3286 | 1401 | |
1da177e4 LT |
1402 | return err; |
1403 | } | |
1404 | ||
80c802f3 | 1405 | |
25ee3286 HX |
1406 | /* Allocate chain of dst_entry's, attach known xfrm's, calculate |
1407 | * all the metrics... Shortly, bundle a bundle. | |
1408 | */ | |
1409 | ||
1410 | static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy, | |
1411 | struct xfrm_state **xfrm, int nx, | |
98313ada | 1412 | const struct flowi *fl, |
25ee3286 HX |
1413 | struct dst_entry *dst) |
1414 | { | |
d7c7544c | 1415 | struct net *net = xp_net(policy); |
25ee3286 HX |
1416 | unsigned long now = jiffies; |
1417 | struct net_device *dev; | |
43a4dea4 | 1418 | struct xfrm_mode *inner_mode; |
25ee3286 HX |
1419 | struct dst_entry *dst_prev = NULL; |
1420 | struct dst_entry *dst0 = NULL; | |
1421 | int i = 0; | |
1422 | int err; | |
1423 | int header_len = 0; | |
a1b05140 | 1424 | int nfheader_len = 0; |
25ee3286 HX |
1425 | int trailer_len = 0; |
1426 | int tos; | |
1427 | int family = policy->selector.family; | |
9bb182a7 YH |
1428 | xfrm_address_t saddr, daddr; |
1429 | ||
1430 | xfrm_flowi_addr_get(fl, &saddr, &daddr, family); | |
25ee3286 HX |
1431 | |
1432 | tos = xfrm_get_tos(fl, family); | |
1433 | err = tos; | |
1434 | if (tos < 0) | |
1435 | goto put_states; | |
1436 | ||
1437 | dst_hold(dst); | |
1438 | ||
1439 | for (; i < nx; i++) { | |
d7c7544c | 1440 | struct xfrm_dst *xdst = xfrm_alloc_dst(net, family); |
25ee3286 HX |
1441 | struct dst_entry *dst1 = &xdst->u.dst; |
1442 | ||
1443 | err = PTR_ERR(xdst); | |
1444 | if (IS_ERR(xdst)) { | |
1445 | dst_release(dst); | |
1446 | goto put_states; | |
1447 | } | |
1448 | ||
43a4dea4 SK |
1449 | if (xfrm[i]->sel.family == AF_UNSPEC) { |
1450 | inner_mode = xfrm_ip2inner_mode(xfrm[i], | |
1451 | xfrm_af2proto(family)); | |
1452 | if (!inner_mode) { | |
1453 | err = -EAFNOSUPPORT; | |
1454 | dst_release(dst); | |
1455 | goto put_states; | |
1456 | } | |
1457 | } else | |
1458 | inner_mode = xfrm[i]->inner_mode; | |
1459 | ||
25ee3286 HX |
1460 | if (!dst_prev) |
1461 | dst0 = dst1; | |
1462 | else { | |
1463 | dst_prev->child = dst_clone(dst1); | |
1464 | dst1->flags |= DST_NOHASH; | |
1465 | } | |
1466 | ||
1467 | xdst->route = dst; | |
defb3519 | 1468 | dst_copy_metrics(dst1, dst); |
25ee3286 HX |
1469 | |
1470 | if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) { | |
1471 | family = xfrm[i]->props.family; | |
9bb182a7 YH |
1472 | dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr, |
1473 | family); | |
25ee3286 HX |
1474 | err = PTR_ERR(dst); |
1475 | if (IS_ERR(dst)) | |
1476 | goto put_states; | |
1477 | } else | |
1478 | dst_hold(dst); | |
1479 | ||
1480 | dst1->xfrm = xfrm[i]; | |
80c802f3 | 1481 | xdst->xfrm_genid = xfrm[i]->genid; |
25ee3286 | 1482 | |
f5b0a874 | 1483 | dst1->obsolete = DST_OBSOLETE_FORCE_CHK; |
25ee3286 HX |
1484 | dst1->flags |= DST_HOST; |
1485 | dst1->lastuse = now; | |
1486 | ||
1487 | dst1->input = dst_discard; | |
43a4dea4 | 1488 | dst1->output = inner_mode->afinfo->output; |
25ee3286 HX |
1489 | |
1490 | dst1->next = dst_prev; | |
1491 | dst_prev = dst1; | |
1492 | ||
1493 | header_len += xfrm[i]->props.header_len; | |
a1b05140 MN |
1494 | if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT) |
1495 | nfheader_len += xfrm[i]->props.header_len; | |
25ee3286 HX |
1496 | trailer_len += xfrm[i]->props.trailer_len; |
1497 | } | |
1498 | ||
1499 | dst_prev->child = dst; | |
1500 | dst0->path = dst; | |
1501 | ||
1502 | err = -ENODEV; | |
1503 | dev = dst->dev; | |
1504 | if (!dev) | |
1505 | goto free_dst; | |
1506 | ||
a1b05140 | 1507 | xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len); |
25ee3286 HX |
1508 | xfrm_init_pmtu(dst_prev); |
1509 | ||
1510 | for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) { | |
1511 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev; | |
1512 | ||
87c1e12b | 1513 | err = xfrm_fill_dst(xdst, dev, fl); |
25ee3286 HX |
1514 | if (err) |
1515 | goto free_dst; | |
1516 | ||
1517 | dst_prev->header_len = header_len; | |
1518 | dst_prev->trailer_len = trailer_len; | |
1519 | header_len -= xdst->u.dst.xfrm->props.header_len; | |
1520 | trailer_len -= xdst->u.dst.xfrm->props.trailer_len; | |
1521 | } | |
1522 | ||
1523 | out: | |
1524 | return dst0; | |
1525 | ||
1526 | put_states: | |
1527 | for (; i < nx; i++) | |
1528 | xfrm_state_put(xfrm[i]); | |
1529 | free_dst: | |
1530 | if (dst0) | |
1531 | dst_free(dst0); | |
1532 | dst0 = ERR_PTR(err); | |
1533 | goto out; | |
1534 | } | |
1535 | ||
157bfc25 | 1536 | static int inline |
3f0e18fb | 1537 | xfrm_dst_alloc_copy(void **target, const void *src, int size) |
157bfc25 MN |
1538 | { |
1539 | if (!*target) { | |
1540 | *target = kmalloc(size, GFP_ATOMIC); | |
1541 | if (!*target) | |
1542 | return -ENOMEM; | |
1543 | } | |
1544 | memcpy(*target, src, size); | |
1545 | return 0; | |
1546 | } | |
1547 | ||
1548 | static int inline | |
1786b389 | 1549 | xfrm_dst_update_parent(struct dst_entry *dst, const struct xfrm_selector *sel) |
157bfc25 MN |
1550 | { |
1551 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1552 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1553 | return xfrm_dst_alloc_copy((void **)&(xdst->partner), | |
1554 | sel, sizeof(*sel)); | |
1555 | #else | |
1556 | return 0; | |
1557 | #endif | |
1558 | } | |
1559 | ||
1560 | static int inline | |
3f0e18fb | 1561 | xfrm_dst_update_origin(struct dst_entry *dst, const struct flowi *fl) |
157bfc25 MN |
1562 | { |
1563 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1564 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1565 | return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl)); | |
1566 | #else | |
1567 | return 0; | |
1568 | #endif | |
1569 | } | |
1da177e4 | 1570 | |
73ff93cd | 1571 | static int xfrm_expand_policies(const struct flowi *fl, u16 family, |
80c802f3 TT |
1572 | struct xfrm_policy **pols, |
1573 | int *num_pols, int *num_xfrms) | |
1574 | { | |
1575 | int i; | |
1576 | ||
1577 | if (*num_pols == 0 || !pols[0]) { | |
1578 | *num_pols = 0; | |
1579 | *num_xfrms = 0; | |
1580 | return 0; | |
1581 | } | |
1582 | if (IS_ERR(pols[0])) | |
1583 | return PTR_ERR(pols[0]); | |
1584 | ||
1585 | *num_xfrms = pols[0]->xfrm_nr; | |
1586 | ||
1587 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1588 | if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW && | |
1589 | pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1590 | pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]), | |
1591 | XFRM_POLICY_TYPE_MAIN, | |
1592 | fl, family, | |
1593 | XFRM_POLICY_OUT); | |
1594 | if (pols[1]) { | |
1595 | if (IS_ERR(pols[1])) { | |
1596 | xfrm_pols_put(pols, *num_pols); | |
1597 | return PTR_ERR(pols[1]); | |
1598 | } | |
1599 | (*num_pols) ++; | |
1600 | (*num_xfrms) += pols[1]->xfrm_nr; | |
1601 | } | |
1602 | } | |
1603 | #endif | |
1604 | for (i = 0; i < *num_pols; i++) { | |
1605 | if (pols[i]->action != XFRM_POLICY_ALLOW) { | |
1606 | *num_xfrms = -1; | |
1607 | break; | |
1608 | } | |
1609 | } | |
1610 | ||
1611 | return 0; | |
1612 | ||
1613 | } | |
1614 | ||
1615 | static struct xfrm_dst * | |
1616 | xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols, | |
4ca2e685 | 1617 | const struct flowi *fl, u16 family, |
80c802f3 TT |
1618 | struct dst_entry *dst_orig) |
1619 | { | |
1620 | struct net *net = xp_net(pols[0]); | |
1621 | struct xfrm_state *xfrm[XFRM_MAX_DEPTH]; | |
1622 | struct dst_entry *dst; | |
1623 | struct xfrm_dst *xdst; | |
1624 | int err; | |
1625 | ||
1626 | /* Try to instantiate a bundle */ | |
1627 | err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family); | |
d809ec89 TT |
1628 | if (err <= 0) { |
1629 | if (err != 0 && err != -EAGAIN) | |
80c802f3 TT |
1630 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); |
1631 | return ERR_PTR(err); | |
1632 | } | |
1633 | ||
1634 | dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig); | |
1635 | if (IS_ERR(dst)) { | |
1636 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR); | |
1637 | return ERR_CAST(dst); | |
1638 | } | |
1639 | ||
1640 | xdst = (struct xfrm_dst *)dst; | |
1641 | xdst->num_xfrms = err; | |
1642 | if (num_pols > 1) | |
1643 | err = xfrm_dst_update_parent(dst, &pols[1]->selector); | |
1644 | else | |
1645 | err = xfrm_dst_update_origin(dst, fl); | |
1646 | if (unlikely(err)) { | |
1647 | dst_free(dst); | |
1648 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR); | |
1649 | return ERR_PTR(err); | |
1650 | } | |
1651 | ||
1652 | xdst->num_pols = num_pols; | |
1653 | memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols); | |
1654 | xdst->policy_genid = atomic_read(&pols[0]->genid); | |
1655 | ||
1656 | return xdst; | |
1657 | } | |
1658 | ||
1659 | static struct flow_cache_object * | |
dee9f4bc | 1660 | xfrm_bundle_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir, |
80c802f3 TT |
1661 | struct flow_cache_object *oldflo, void *ctx) |
1662 | { | |
1663 | struct dst_entry *dst_orig = (struct dst_entry *)ctx; | |
1664 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; | |
1665 | struct xfrm_dst *xdst, *new_xdst; | |
1666 | int num_pols = 0, num_xfrms = 0, i, err, pol_dead; | |
1667 | ||
1668 | /* Check if the policies from old bundle are usable */ | |
1669 | xdst = NULL; | |
1670 | if (oldflo) { | |
1671 | xdst = container_of(oldflo, struct xfrm_dst, flo); | |
1672 | num_pols = xdst->num_pols; | |
1673 | num_xfrms = xdst->num_xfrms; | |
1674 | pol_dead = 0; | |
1675 | for (i = 0; i < num_pols; i++) { | |
1676 | pols[i] = xdst->pols[i]; | |
1677 | pol_dead |= pols[i]->walk.dead; | |
1678 | } | |
1679 | if (pol_dead) { | |
1680 | dst_free(&xdst->u.dst); | |
1681 | xdst = NULL; | |
1682 | num_pols = 0; | |
1683 | num_xfrms = 0; | |
1684 | oldflo = NULL; | |
1685 | } | |
1686 | } | |
1687 | ||
1688 | /* Resolve policies to use if we couldn't get them from | |
1689 | * previous cache entry */ | |
1690 | if (xdst == NULL) { | |
1691 | num_pols = 1; | |
1692 | pols[0] = __xfrm_policy_lookup(net, fl, family, dir); | |
1693 | err = xfrm_expand_policies(fl, family, pols, | |
1694 | &num_pols, &num_xfrms); | |
1695 | if (err < 0) | |
1696 | goto inc_error; | |
1697 | if (num_pols == 0) | |
1698 | return NULL; | |
1699 | if (num_xfrms <= 0) | |
1700 | goto make_dummy_bundle; | |
1701 | } | |
1702 | ||
1703 | new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family, dst_orig); | |
1704 | if (IS_ERR(new_xdst)) { | |
1705 | err = PTR_ERR(new_xdst); | |
1706 | if (err != -EAGAIN) | |
1707 | goto error; | |
1708 | if (oldflo == NULL) | |
1709 | goto make_dummy_bundle; | |
1710 | dst_hold(&xdst->u.dst); | |
1711 | return oldflo; | |
d809ec89 TT |
1712 | } else if (new_xdst == NULL) { |
1713 | num_xfrms = 0; | |
1714 | if (oldflo == NULL) | |
1715 | goto make_dummy_bundle; | |
1716 | xdst->num_xfrms = 0; | |
1717 | dst_hold(&xdst->u.dst); | |
1718 | return oldflo; | |
80c802f3 TT |
1719 | } |
1720 | ||
1721 | /* Kill the previous bundle */ | |
1722 | if (xdst) { | |
1723 | /* The policies were stolen for newly generated bundle */ | |
1724 | xdst->num_pols = 0; | |
1725 | dst_free(&xdst->u.dst); | |
1726 | } | |
1727 | ||
1728 | /* Flow cache does not have reference, it dst_free()'s, | |
1729 | * but we do need to return one reference for original caller */ | |
1730 | dst_hold(&new_xdst->u.dst); | |
1731 | return &new_xdst->flo; | |
1732 | ||
1733 | make_dummy_bundle: | |
1734 | /* We found policies, but there's no bundles to instantiate: | |
1735 | * either because the policy blocks, has no transformations or | |
1736 | * we could not build template (no xfrm_states).*/ | |
1737 | xdst = xfrm_alloc_dst(net, family); | |
1738 | if (IS_ERR(xdst)) { | |
1739 | xfrm_pols_put(pols, num_pols); | |
1740 | return ERR_CAST(xdst); | |
1741 | } | |
1742 | xdst->num_pols = num_pols; | |
1743 | xdst->num_xfrms = num_xfrms; | |
1744 | memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols); | |
1745 | ||
1746 | dst_hold(&xdst->u.dst); | |
1747 | return &xdst->flo; | |
1748 | ||
1749 | inc_error: | |
1750 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); | |
1751 | error: | |
1752 | if (xdst != NULL) | |
1753 | dst_free(&xdst->u.dst); | |
1754 | else | |
1755 | xfrm_pols_put(pols, num_pols); | |
1756 | return ERR_PTR(err); | |
1757 | } | |
1da177e4 | 1758 | |
2774c131 DM |
1759 | static struct dst_entry *make_blackhole(struct net *net, u16 family, |
1760 | struct dst_entry *dst_orig) | |
1761 | { | |
1762 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1763 | struct dst_entry *ret; | |
1764 | ||
1765 | if (!afinfo) { | |
1766 | dst_release(dst_orig); | |
1767 | ret = ERR_PTR(-EINVAL); | |
1768 | } else { | |
1769 | ret = afinfo->blackhole_route(net, dst_orig); | |
1770 | } | |
1771 | xfrm_policy_put_afinfo(afinfo); | |
1772 | ||
1773 | return ret; | |
1774 | } | |
1775 | ||
1da177e4 LT |
1776 | /* Main function: finds/creates a bundle for given flow. |
1777 | * | |
1778 | * At the moment we eat a raw IP route. Mostly to speed up lookups | |
1779 | * on interfaces with disabled IPsec. | |
1780 | */ | |
452edd59 DM |
1781 | struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig, |
1782 | const struct flowi *fl, | |
1783 | struct sock *sk, int flags) | |
1da177e4 | 1784 | { |
4e81bb83 | 1785 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
80c802f3 TT |
1786 | struct flow_cache_object *flo; |
1787 | struct xfrm_dst *xdst; | |
452edd59 | 1788 | struct dst_entry *dst, *route; |
80c802f3 | 1789 | u16 family = dst_orig->ops->family; |
df71837d | 1790 | u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT); |
4b021628 | 1791 | int i, err, num_pols, num_xfrms = 0, drop_pols = 0; |
e0d1caa7 | 1792 | |
1da177e4 | 1793 | restart: |
80c802f3 TT |
1794 | dst = NULL; |
1795 | xdst = NULL; | |
1796 | route = NULL; | |
4e81bb83 | 1797 | |
f7944fb1 | 1798 | if (sk && sk->sk_policy[XFRM_POLICY_OUT]) { |
80c802f3 TT |
1799 | num_pols = 1; |
1800 | pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl); | |
1801 | err = xfrm_expand_policies(fl, family, pols, | |
1802 | &num_pols, &num_xfrms); | |
1803 | if (err < 0) | |
75b8c133 | 1804 | goto dropdst; |
80c802f3 TT |
1805 | |
1806 | if (num_pols) { | |
1807 | if (num_xfrms <= 0) { | |
1808 | drop_pols = num_pols; | |
1809 | goto no_transform; | |
1810 | } | |
1811 | ||
1812 | xdst = xfrm_resolve_and_create_bundle( | |
1813 | pols, num_pols, fl, | |
1814 | family, dst_orig); | |
1815 | if (IS_ERR(xdst)) { | |
1816 | xfrm_pols_put(pols, num_pols); | |
1817 | err = PTR_ERR(xdst); | |
1818 | goto dropdst; | |
d809ec89 TT |
1819 | } else if (xdst == NULL) { |
1820 | num_xfrms = 0; | |
1821 | drop_pols = num_pols; | |
1822 | goto no_transform; | |
80c802f3 TT |
1823 | } |
1824 | ||
fbd50608 SK |
1825 | dst_hold(&xdst->u.dst); |
1826 | ||
80c802f3 TT |
1827 | spin_lock_bh(&xfrm_policy_sk_bundle_lock); |
1828 | xdst->u.dst.next = xfrm_policy_sk_bundles; | |
1829 | xfrm_policy_sk_bundles = &xdst->u.dst; | |
1830 | spin_unlock_bh(&xfrm_policy_sk_bundle_lock); | |
1831 | ||
1832 | route = xdst->route; | |
0aa64774 | 1833 | } |
3bccfbc7 | 1834 | } |
1da177e4 | 1835 | |
80c802f3 | 1836 | if (xdst == NULL) { |
1da177e4 | 1837 | /* To accelerate a bit... */ |
2518c7c2 | 1838 | if ((dst_orig->flags & DST_NOXFRM) || |
52479b62 | 1839 | !net->xfrm.policy_count[XFRM_POLICY_OUT]) |
8b7817f3 | 1840 | goto nopol; |
1da177e4 | 1841 | |
80c802f3 TT |
1842 | flo = flow_cache_lookup(net, fl, family, dir, |
1843 | xfrm_bundle_lookup, dst_orig); | |
1844 | if (flo == NULL) | |
1845 | goto nopol; | |
fe1a5f03 | 1846 | if (IS_ERR(flo)) { |
80c802f3 | 1847 | err = PTR_ERR(flo); |
75b8c133 | 1848 | goto dropdst; |
d66e37a9 | 1849 | } |
80c802f3 TT |
1850 | xdst = container_of(flo, struct xfrm_dst, flo); |
1851 | ||
1852 | num_pols = xdst->num_pols; | |
1853 | num_xfrms = xdst->num_xfrms; | |
1854 | memcpy(pols, xdst->pols, sizeof(struct xfrm_policy*) * num_pols); | |
1855 | route = xdst->route; | |
1856 | } | |
1857 | ||
1858 | dst = &xdst->u.dst; | |
1859 | if (route == NULL && num_xfrms > 0) { | |
1860 | /* The only case when xfrm_bundle_lookup() returns a | |
1861 | * bundle with null route, is when the template could | |
1862 | * not be resolved. It means policies are there, but | |
1863 | * bundle could not be created, since we don't yet | |
1864 | * have the xfrm_state's. We need to wait for KM to | |
1865 | * negotiate new SA's or bail out with error.*/ | |
1866 | if (net->xfrm.sysctl_larval_drop) { | |
1867 | /* EREMOTE tells the caller to generate | |
1868 | * a one-shot blackhole route. */ | |
1869 | dst_release(dst); | |
a1aa3483 | 1870 | xfrm_pols_put(pols, drop_pols); |
80c802f3 | 1871 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); |
2774c131 | 1872 | |
452edd59 | 1873 | return make_blackhole(net, family, dst_orig); |
80c802f3 | 1874 | } |
1d28f42c | 1875 | if (fl->flowi_flags & FLOWI_FLAG_CAN_SLEEP) { |
80c802f3 TT |
1876 | DECLARE_WAITQUEUE(wait, current); |
1877 | ||
1878 | add_wait_queue(&net->xfrm.km_waitq, &wait); | |
1879 | set_current_state(TASK_INTERRUPTIBLE); | |
1880 | schedule(); | |
1881 | set_current_state(TASK_RUNNING); | |
1882 | remove_wait_queue(&net->xfrm.km_waitq, &wait); | |
1883 | ||
1884 | if (!signal_pending(current)) { | |
1885 | dst_release(dst); | |
1886 | goto restart; | |
1887 | } | |
1888 | ||
1889 | err = -ERESTART; | |
1890 | } else | |
1891 | err = -EAGAIN; | |
1892 | ||
1893 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); | |
1894 | goto error; | |
1da177e4 LT |
1895 | } |
1896 | ||
80c802f3 TT |
1897 | no_transform: |
1898 | if (num_pols == 0) | |
8b7817f3 | 1899 | goto nopol; |
1da177e4 | 1900 | |
80c802f3 TT |
1901 | if ((flags & XFRM_LOOKUP_ICMP) && |
1902 | !(pols[0]->flags & XFRM_POLICY_ICMP)) { | |
1903 | err = -ENOENT; | |
8b7817f3 | 1904 | goto error; |
80c802f3 | 1905 | } |
8b7817f3 | 1906 | |
80c802f3 TT |
1907 | for (i = 0; i < num_pols; i++) |
1908 | pols[i]->curlft.use_time = get_seconds(); | |
8b7817f3 | 1909 | |
80c802f3 | 1910 | if (num_xfrms < 0) { |
1da177e4 | 1911 | /* Prohibit the flow */ |
59c9940e | 1912 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK); |
e104411b PM |
1913 | err = -EPERM; |
1914 | goto error; | |
80c802f3 TT |
1915 | } else if (num_xfrms > 0) { |
1916 | /* Flow transformed */ | |
80c802f3 TT |
1917 | dst_release(dst_orig); |
1918 | } else { | |
1919 | /* Flow passes untransformed */ | |
1920 | dst_release(dst); | |
452edd59 | 1921 | dst = dst_orig; |
1da177e4 | 1922 | } |
80c802f3 TT |
1923 | ok: |
1924 | xfrm_pols_put(pols, drop_pols); | |
0c183379 G |
1925 | if (dst && dst->xfrm && |
1926 | dst->xfrm->props.mode == XFRM_MODE_TUNNEL) | |
1927 | dst->flags |= DST_XFRM_TUNNEL; | |
452edd59 | 1928 | return dst; |
1da177e4 | 1929 | |
80c802f3 | 1930 | nopol: |
452edd59 DM |
1931 | if (!(flags & XFRM_LOOKUP_ICMP)) { |
1932 | dst = dst_orig; | |
80c802f3 | 1933 | goto ok; |
452edd59 | 1934 | } |
80c802f3 | 1935 | err = -ENOENT; |
1da177e4 | 1936 | error: |
80c802f3 | 1937 | dst_release(dst); |
75b8c133 HX |
1938 | dropdst: |
1939 | dst_release(dst_orig); | |
80c802f3 | 1940 | xfrm_pols_put(pols, drop_pols); |
452edd59 | 1941 | return ERR_PTR(err); |
1da177e4 LT |
1942 | } |
1943 | EXPORT_SYMBOL(xfrm_lookup); | |
1944 | ||
df0ba92a | 1945 | static inline int |
8f029de2 | 1946 | xfrm_secpath_reject(int idx, struct sk_buff *skb, const struct flowi *fl) |
df0ba92a MN |
1947 | { |
1948 | struct xfrm_state *x; | |
df0ba92a MN |
1949 | |
1950 | if (!skb->sp || idx < 0 || idx >= skb->sp->len) | |
1951 | return 0; | |
1952 | x = skb->sp->xvec[idx]; | |
1953 | if (!x->type->reject) | |
1954 | return 0; | |
1ecafede | 1955 | return x->type->reject(x, skb, fl); |
df0ba92a MN |
1956 | } |
1957 | ||
1da177e4 LT |
1958 | /* When skb is transformed back to its "native" form, we have to |
1959 | * check policy restrictions. At the moment we make this in maximally | |
1960 | * stupid way. Shame on me. :-) Of course, connected sockets must | |
1961 | * have policy cached at them. | |
1962 | */ | |
1963 | ||
1964 | static inline int | |
7db454b9 | 1965 | xfrm_state_ok(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, |
1da177e4 LT |
1966 | unsigned short family) |
1967 | { | |
1968 | if (xfrm_state_kern(x)) | |
928ba416 | 1969 | return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family); |
1da177e4 LT |
1970 | return x->id.proto == tmpl->id.proto && |
1971 | (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && | |
1972 | (x->props.reqid == tmpl->reqid || !tmpl->reqid) && | |
1973 | x->props.mode == tmpl->mode && | |
c5d18e98 | 1974 | (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) || |
f3bd4840 | 1975 | !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) && |
7e49e6de MN |
1976 | !(x->props.mode != XFRM_MODE_TRANSPORT && |
1977 | xfrm_state_addr_cmp(tmpl, x, family)); | |
1da177e4 LT |
1978 | } |
1979 | ||
df0ba92a MN |
1980 | /* |
1981 | * 0 or more than 0 is returned when validation is succeeded (either bypass | |
1982 | * because of optional transport mode, or next index of the mathced secpath | |
1983 | * state with the template. | |
1984 | * -1 is returned when no matching template is found. | |
1985 | * Otherwise "-2 - errored_index" is returned. | |
1986 | */ | |
1da177e4 | 1987 | static inline int |
22cccb7e | 1988 | xfrm_policy_ok(const struct xfrm_tmpl *tmpl, const struct sec_path *sp, int start, |
1da177e4 LT |
1989 | unsigned short family) |
1990 | { | |
1991 | int idx = start; | |
1992 | ||
1993 | if (tmpl->optional) { | |
7e49e6de | 1994 | if (tmpl->mode == XFRM_MODE_TRANSPORT) |
1da177e4 LT |
1995 | return start; |
1996 | } else | |
1997 | start = -1; | |
1998 | for (; idx < sp->len; idx++) { | |
dbe5b4aa | 1999 | if (xfrm_state_ok(tmpl, sp->xvec[idx], family)) |
1da177e4 | 2000 | return ++idx; |
df0ba92a MN |
2001 | if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) { |
2002 | if (start == -1) | |
2003 | start = -2-idx; | |
1da177e4 | 2004 | break; |
df0ba92a | 2005 | } |
1da177e4 LT |
2006 | } |
2007 | return start; | |
2008 | } | |
2009 | ||
d5422efe HX |
2010 | int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, |
2011 | unsigned int family, int reverse) | |
1da177e4 LT |
2012 | { |
2013 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
e0d1caa7 | 2014 | int err; |
1da177e4 LT |
2015 | |
2016 | if (unlikely(afinfo == NULL)) | |
2017 | return -EAFNOSUPPORT; | |
2018 | ||
d5422efe | 2019 | afinfo->decode_session(skb, fl, reverse); |
1d28f42c | 2020 | err = security_xfrm_decode_session(skb, &fl->flowi_secid); |
1da177e4 | 2021 | xfrm_policy_put_afinfo(afinfo); |
e0d1caa7 | 2022 | return err; |
1da177e4 | 2023 | } |
d5422efe | 2024 | EXPORT_SYMBOL(__xfrm_decode_session); |
1da177e4 | 2025 | |
9a7386ec | 2026 | static inline int secpath_has_nontransport(const struct sec_path *sp, int k, int *idxp) |
1da177e4 LT |
2027 | { |
2028 | for (; k < sp->len; k++) { | |
df0ba92a | 2029 | if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) { |
d1d9facf | 2030 | *idxp = k; |
1da177e4 | 2031 | return 1; |
df0ba92a | 2032 | } |
1da177e4 LT |
2033 | } |
2034 | ||
2035 | return 0; | |
2036 | } | |
2037 | ||
a716c119 | 2038 | int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, |
1da177e4 LT |
2039 | unsigned short family) |
2040 | { | |
f6e1e25d | 2041 | struct net *net = dev_net(skb->dev); |
1da177e4 | 2042 | struct xfrm_policy *pol; |
4e81bb83 MN |
2043 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
2044 | int npols = 0; | |
2045 | int xfrm_nr; | |
2046 | int pi; | |
d5422efe | 2047 | int reverse; |
1da177e4 | 2048 | struct flowi fl; |
d5422efe | 2049 | u8 fl_dir; |
df0ba92a | 2050 | int xerr_idx = -1; |
1da177e4 | 2051 | |
d5422efe HX |
2052 | reverse = dir & ~XFRM_POLICY_MASK; |
2053 | dir &= XFRM_POLICY_MASK; | |
2054 | fl_dir = policy_to_flow_dir(dir); | |
2055 | ||
0aa64774 | 2056 | if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) { |
59c9940e | 2057 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); |
1da177e4 | 2058 | return 0; |
0aa64774 MN |
2059 | } |
2060 | ||
eb9c7ebe | 2061 | nf_nat_decode_session(skb, &fl, family); |
1da177e4 LT |
2062 | |
2063 | /* First, check used SA against their selectors. */ | |
2064 | if (skb->sp) { | |
2065 | int i; | |
2066 | ||
2067 | for (i=skb->sp->len-1; i>=0; i--) { | |
dbe5b4aa | 2068 | struct xfrm_state *x = skb->sp->xvec[i]; |
0aa64774 | 2069 | if (!xfrm_selector_match(&x->sel, &fl, family)) { |
59c9940e | 2070 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH); |
1da177e4 | 2071 | return 0; |
0aa64774 | 2072 | } |
1da177e4 LT |
2073 | } |
2074 | } | |
2075 | ||
2076 | pol = NULL; | |
3bccfbc7 | 2077 | if (sk && sk->sk_policy[dir]) { |
e0d1caa7 | 2078 | pol = xfrm_sk_policy_lookup(sk, dir, &fl); |
0aa64774 | 2079 | if (IS_ERR(pol)) { |
59c9940e | 2080 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
3bccfbc7 | 2081 | return 0; |
0aa64774 | 2082 | } |
3bccfbc7 | 2083 | } |
1da177e4 | 2084 | |
fe1a5f03 TT |
2085 | if (!pol) { |
2086 | struct flow_cache_object *flo; | |
2087 | ||
2088 | flo = flow_cache_lookup(net, &fl, family, fl_dir, | |
2089 | xfrm_policy_lookup, NULL); | |
2090 | if (IS_ERR_OR_NULL(flo)) | |
2091 | pol = ERR_CAST(flo); | |
2092 | else | |
2093 | pol = container_of(flo, struct xfrm_policy, flo); | |
2094 | } | |
1da177e4 | 2095 | |
0aa64774 | 2096 | if (IS_ERR(pol)) { |
59c9940e | 2097 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
134b0fc5 | 2098 | return 0; |
0aa64774 | 2099 | } |
134b0fc5 | 2100 | |
df0ba92a | 2101 | if (!pol) { |
d1d9facf | 2102 | if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) { |
df0ba92a | 2103 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
59c9940e | 2104 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS); |
df0ba92a MN |
2105 | return 0; |
2106 | } | |
2107 | return 1; | |
2108 | } | |
1da177e4 | 2109 | |
9d729f72 | 2110 | pol->curlft.use_time = get_seconds(); |
1da177e4 | 2111 | |
4e81bb83 MN |
2112 | pols[0] = pol; |
2113 | npols ++; | |
2114 | #ifdef CONFIG_XFRM_SUB_POLICY | |
2115 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
f6e1e25d | 2116 | pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, |
4e81bb83 MN |
2117 | &fl, family, |
2118 | XFRM_POLICY_IN); | |
2119 | if (pols[1]) { | |
0aa64774 | 2120 | if (IS_ERR(pols[1])) { |
59c9940e | 2121 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
134b0fc5 | 2122 | return 0; |
0aa64774 | 2123 | } |
9d729f72 | 2124 | pols[1]->curlft.use_time = get_seconds(); |
4e81bb83 MN |
2125 | npols ++; |
2126 | } | |
2127 | } | |
2128 | #endif | |
2129 | ||
1da177e4 LT |
2130 | if (pol->action == XFRM_POLICY_ALLOW) { |
2131 | struct sec_path *sp; | |
2132 | static struct sec_path dummy; | |
4e81bb83 | 2133 | struct xfrm_tmpl *tp[XFRM_MAX_DEPTH]; |
41a49cc3 | 2134 | struct xfrm_tmpl *stp[XFRM_MAX_DEPTH]; |
4e81bb83 MN |
2135 | struct xfrm_tmpl **tpp = tp; |
2136 | int ti = 0; | |
1da177e4 LT |
2137 | int i, k; |
2138 | ||
2139 | if ((sp = skb->sp) == NULL) | |
2140 | sp = &dummy; | |
2141 | ||
4e81bb83 MN |
2142 | for (pi = 0; pi < npols; pi++) { |
2143 | if (pols[pi] != pol && | |
0aa64774 | 2144 | pols[pi]->action != XFRM_POLICY_ALLOW) { |
59c9940e | 2145 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); |
4e81bb83 | 2146 | goto reject; |
0aa64774 MN |
2147 | } |
2148 | if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
59c9940e | 2149 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); |
4e81bb83 | 2150 | goto reject_error; |
0aa64774 | 2151 | } |
4e81bb83 MN |
2152 | for (i = 0; i < pols[pi]->xfrm_nr; i++) |
2153 | tpp[ti++] = &pols[pi]->xfrm_vec[i]; | |
2154 | } | |
2155 | xfrm_nr = ti; | |
41a49cc3 MN |
2156 | if (npols > 1) { |
2157 | xfrm_tmpl_sort(stp, tpp, xfrm_nr, family); | |
2158 | tpp = stp; | |
2159 | } | |
4e81bb83 | 2160 | |
1da177e4 LT |
2161 | /* For each tunnel xfrm, find the first matching tmpl. |
2162 | * For each tmpl before that, find corresponding xfrm. | |
2163 | * Order is _important_. Later we will implement | |
2164 | * some barriers, but at the moment barriers | |
2165 | * are implied between each two transformations. | |
2166 | */ | |
4e81bb83 MN |
2167 | for (i = xfrm_nr-1, k = 0; i >= 0; i--) { |
2168 | k = xfrm_policy_ok(tpp[i], sp, k, family); | |
df0ba92a | 2169 | if (k < 0) { |
d1d9facf JM |
2170 | if (k < -1) |
2171 | /* "-2 - errored_index" returned */ | |
2172 | xerr_idx = -(2+k); | |
59c9940e | 2173 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 2174 | goto reject; |
df0ba92a | 2175 | } |
1da177e4 LT |
2176 | } |
2177 | ||
0aa64774 | 2178 | if (secpath_has_nontransport(sp, k, &xerr_idx)) { |
59c9940e | 2179 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 2180 | goto reject; |
0aa64774 | 2181 | } |
1da177e4 | 2182 | |
4e81bb83 | 2183 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
2184 | return 1; |
2185 | } | |
59c9940e | 2186 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); |
1da177e4 LT |
2187 | |
2188 | reject: | |
df0ba92a | 2189 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
4e81bb83 MN |
2190 | reject_error: |
2191 | xfrm_pols_put(pols, npols); | |
1da177e4 LT |
2192 | return 0; |
2193 | } | |
2194 | EXPORT_SYMBOL(__xfrm_policy_check); | |
2195 | ||
2196 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
2197 | { | |
99a66657 | 2198 | struct net *net = dev_net(skb->dev); |
1da177e4 | 2199 | struct flowi fl; |
adf30907 | 2200 | struct dst_entry *dst; |
73137147 | 2201 | int res = 1; |
1da177e4 | 2202 | |
0aa64774 | 2203 | if (xfrm_decode_session(skb, &fl, family) < 0) { |
72032fdb | 2204 | XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR); |
1da177e4 | 2205 | return 0; |
0aa64774 | 2206 | } |
1da177e4 | 2207 | |
fafeeb6c | 2208 | skb_dst_force(skb); |
adf30907 | 2209 | |
452edd59 DM |
2210 | dst = xfrm_lookup(net, skb_dst(skb), &fl, NULL, 0); |
2211 | if (IS_ERR(dst)) { | |
73137147 | 2212 | res = 0; |
452edd59 DM |
2213 | dst = NULL; |
2214 | } | |
adf30907 ED |
2215 | skb_dst_set(skb, dst); |
2216 | return res; | |
1da177e4 LT |
2217 | } |
2218 | EXPORT_SYMBOL(__xfrm_route_forward); | |
2219 | ||
d49c73c7 DM |
2220 | /* Optimize later using cookies and generation ids. */ |
2221 | ||
1da177e4 LT |
2222 | static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) |
2223 | { | |
d49c73c7 | 2224 | /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete |
f5b0a874 DM |
2225 | * to DST_OBSOLETE_FORCE_CHK to force all XFRM destinations to |
2226 | * get validated by dst_ops->check on every use. We do this | |
2227 | * because when a normal route referenced by an XFRM dst is | |
2228 | * obsoleted we do not go looking around for all parent | |
2229 | * referencing XFRM dsts so that we can invalidate them. It | |
2230 | * is just too much work. Instead we make the checks here on | |
2231 | * every use. For example: | |
d49c73c7 DM |
2232 | * |
2233 | * XFRM dst A --> IPv4 dst X | |
2234 | * | |
2235 | * X is the "xdst->route" of A (X is also the "dst->path" of A | |
2236 | * in this example). If X is marked obsolete, "A" will not | |
2237 | * notice. That's what we are validating here via the | |
2238 | * stale_bundle() check. | |
2239 | * | |
2240 | * When a policy's bundle is pruned, we dst_free() the XFRM | |
f5b0a874 DM |
2241 | * dst which causes it's ->obsolete field to be set to |
2242 | * DST_OBSOLETE_DEAD. If an XFRM dst has been pruned like | |
2243 | * this, we want to force a new route lookup. | |
399c180a | 2244 | */ |
d49c73c7 DM |
2245 | if (dst->obsolete < 0 && !stale_bundle(dst)) |
2246 | return dst; | |
2247 | ||
1da177e4 LT |
2248 | return NULL; |
2249 | } | |
2250 | ||
2251 | static int stale_bundle(struct dst_entry *dst) | |
2252 | { | |
12fdb4d3 | 2253 | return !xfrm_bundle_ok((struct xfrm_dst *)dst); |
1da177e4 LT |
2254 | } |
2255 | ||
aabc9761 | 2256 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
1da177e4 | 2257 | { |
1da177e4 | 2258 | while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { |
c346dca1 | 2259 | dst->dev = dev_net(dev)->loopback_dev; |
de3cb747 | 2260 | dev_hold(dst->dev); |
1da177e4 LT |
2261 | dev_put(dev); |
2262 | } | |
2263 | } | |
aabc9761 | 2264 | EXPORT_SYMBOL(xfrm_dst_ifdown); |
1da177e4 LT |
2265 | |
2266 | static void xfrm_link_failure(struct sk_buff *skb) | |
2267 | { | |
2268 | /* Impossible. Such dst must be popped before reaches point of failure. */ | |
1da177e4 LT |
2269 | } |
2270 | ||
2271 | static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) | |
2272 | { | |
2273 | if (dst) { | |
2274 | if (dst->obsolete) { | |
2275 | dst_release(dst); | |
2276 | dst = NULL; | |
2277 | } | |
2278 | } | |
2279 | return dst; | |
2280 | } | |
2281 | ||
80c802f3 | 2282 | static void __xfrm_garbage_collect(struct net *net) |
1da177e4 | 2283 | { |
80c802f3 | 2284 | struct dst_entry *head, *next; |
1da177e4 | 2285 | |
80c802f3 TT |
2286 | spin_lock_bh(&xfrm_policy_sk_bundle_lock); |
2287 | head = xfrm_policy_sk_bundles; | |
2288 | xfrm_policy_sk_bundles = NULL; | |
2289 | spin_unlock_bh(&xfrm_policy_sk_bundle_lock); | |
2518c7c2 | 2290 | |
80c802f3 TT |
2291 | while (head) { |
2292 | next = head->next; | |
2293 | dst_free(head); | |
2294 | head = next; | |
1da177e4 LT |
2295 | } |
2296 | } | |
2297 | ||
c0ed1c14 SK |
2298 | static void xfrm_garbage_collect(struct net *net) |
2299 | { | |
2300 | flow_cache_flush(); | |
2301 | __xfrm_garbage_collect(net); | |
2302 | } | |
2303 | ||
2304 | static void xfrm_garbage_collect_deferred(struct net *net) | |
2305 | { | |
2306 | flow_cache_flush_deferred(); | |
2307 | __xfrm_garbage_collect(net); | |
2308 | } | |
2309 | ||
25ee3286 | 2310 | static void xfrm_init_pmtu(struct dst_entry *dst) |
1da177e4 LT |
2311 | { |
2312 | do { | |
2313 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2314 | u32 pmtu, route_mtu_cached; | |
2315 | ||
2316 | pmtu = dst_mtu(dst->child); | |
2317 | xdst->child_mtu_cached = pmtu; | |
2318 | ||
2319 | pmtu = xfrm_state_mtu(dst->xfrm, pmtu); | |
2320 | ||
2321 | route_mtu_cached = dst_mtu(xdst->route); | |
2322 | xdst->route_mtu_cached = route_mtu_cached; | |
2323 | ||
2324 | if (pmtu > route_mtu_cached) | |
2325 | pmtu = route_mtu_cached; | |
2326 | ||
defb3519 | 2327 | dst_metric_set(dst, RTAX_MTU, pmtu); |
1da177e4 LT |
2328 | } while ((dst = dst->next)); |
2329 | } | |
2330 | ||
1da177e4 LT |
2331 | /* Check that the bundle accepts the flow and its components are |
2332 | * still valid. | |
2333 | */ | |
2334 | ||
12fdb4d3 | 2335 | static int xfrm_bundle_ok(struct xfrm_dst *first) |
1da177e4 LT |
2336 | { |
2337 | struct dst_entry *dst = &first->u.dst; | |
2338 | struct xfrm_dst *last; | |
2339 | u32 mtu; | |
2340 | ||
92d63dec | 2341 | if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || |
1da177e4 LT |
2342 | (dst->dev && !netif_running(dst->dev))) |
2343 | return 0; | |
2344 | ||
2345 | last = NULL; | |
2346 | ||
2347 | do { | |
2348 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2349 | ||
1da177e4 LT |
2350 | if (dst->xfrm->km.state != XFRM_STATE_VALID) |
2351 | return 0; | |
80c802f3 TT |
2352 | if (xdst->xfrm_genid != dst->xfrm->genid) |
2353 | return 0; | |
b1312c89 TT |
2354 | if (xdst->num_pols > 0 && |
2355 | xdst->policy_genid != atomic_read(&xdst->pols[0]->genid)) | |
9d4a706d | 2356 | return 0; |
e53820de | 2357 | |
1da177e4 LT |
2358 | mtu = dst_mtu(dst->child); |
2359 | if (xdst->child_mtu_cached != mtu) { | |
2360 | last = xdst; | |
2361 | xdst->child_mtu_cached = mtu; | |
2362 | } | |
2363 | ||
92d63dec | 2364 | if (!dst_check(xdst->route, xdst->route_cookie)) |
1da177e4 LT |
2365 | return 0; |
2366 | mtu = dst_mtu(xdst->route); | |
2367 | if (xdst->route_mtu_cached != mtu) { | |
2368 | last = xdst; | |
2369 | xdst->route_mtu_cached = mtu; | |
2370 | } | |
2371 | ||
2372 | dst = dst->child; | |
2373 | } while (dst->xfrm); | |
2374 | ||
2375 | if (likely(!last)) | |
2376 | return 1; | |
2377 | ||
2378 | mtu = last->child_mtu_cached; | |
2379 | for (;;) { | |
2380 | dst = &last->u.dst; | |
2381 | ||
2382 | mtu = xfrm_state_mtu(dst->xfrm, mtu); | |
2383 | if (mtu > last->route_mtu_cached) | |
2384 | mtu = last->route_mtu_cached; | |
defb3519 | 2385 | dst_metric_set(dst, RTAX_MTU, mtu); |
1da177e4 LT |
2386 | |
2387 | if (last == first) | |
2388 | break; | |
2389 | ||
bd0bf076 | 2390 | last = (struct xfrm_dst *)last->u.dst.next; |
1da177e4 LT |
2391 | last->child_mtu_cached = mtu; |
2392 | } | |
2393 | ||
2394 | return 1; | |
2395 | } | |
2396 | ||
0dbaee3b DM |
2397 | static unsigned int xfrm_default_advmss(const struct dst_entry *dst) |
2398 | { | |
2399 | return dst_metric_advmss(dst->path); | |
2400 | } | |
2401 | ||
ebb762f2 | 2402 | static unsigned int xfrm_mtu(const struct dst_entry *dst) |
d33e4553 | 2403 | { |
618f9bc7 SK |
2404 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
2405 | ||
2406 | return mtu ? : dst_mtu(dst->path); | |
d33e4553 DM |
2407 | } |
2408 | ||
f894cbf8 DM |
2409 | static struct neighbour *xfrm_neigh_lookup(const struct dst_entry *dst, |
2410 | struct sk_buff *skb, | |
2411 | const void *daddr) | |
d3aaeb38 | 2412 | { |
f894cbf8 | 2413 | return dst->path->ops->neigh_lookup(dst, skb, daddr); |
d3aaeb38 DM |
2414 | } |
2415 | ||
1da177e4 LT |
2416 | int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) |
2417 | { | |
d7c7544c | 2418 | struct net *net; |
1da177e4 LT |
2419 | int err = 0; |
2420 | if (unlikely(afinfo == NULL)) | |
2421 | return -EINVAL; | |
2422 | if (unlikely(afinfo->family >= NPROTO)) | |
2423 | return -EAFNOSUPPORT; | |
418a99ac | 2424 | spin_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2425 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) |
2426 | err = -ENOBUFS; | |
2427 | else { | |
2428 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2429 | if (likely(dst_ops->kmem_cachep == NULL)) | |
2430 | dst_ops->kmem_cachep = xfrm_dst_cache; | |
2431 | if (likely(dst_ops->check == NULL)) | |
2432 | dst_ops->check = xfrm_dst_check; | |
0dbaee3b DM |
2433 | if (likely(dst_ops->default_advmss == NULL)) |
2434 | dst_ops->default_advmss = xfrm_default_advmss; | |
ebb762f2 SK |
2435 | if (likely(dst_ops->mtu == NULL)) |
2436 | dst_ops->mtu = xfrm_mtu; | |
1da177e4 LT |
2437 | if (likely(dst_ops->negative_advice == NULL)) |
2438 | dst_ops->negative_advice = xfrm_negative_advice; | |
2439 | if (likely(dst_ops->link_failure == NULL)) | |
2440 | dst_ops->link_failure = xfrm_link_failure; | |
d3aaeb38 DM |
2441 | if (likely(dst_ops->neigh_lookup == NULL)) |
2442 | dst_ops->neigh_lookup = xfrm_neigh_lookup; | |
1da177e4 | 2443 | if (likely(afinfo->garbage_collect == NULL)) |
c0ed1c14 | 2444 | afinfo->garbage_collect = xfrm_garbage_collect_deferred; |
418a99ac | 2445 | rcu_assign_pointer(xfrm_policy_afinfo[afinfo->family], afinfo); |
1da177e4 | 2446 | } |
418a99ac | 2447 | spin_unlock_bh(&xfrm_policy_afinfo_lock); |
d7c7544c AD |
2448 | |
2449 | rtnl_lock(); | |
2450 | for_each_net(net) { | |
2451 | struct dst_ops *xfrm_dst_ops; | |
2452 | ||
2453 | switch (afinfo->family) { | |
2454 | case AF_INET: | |
2455 | xfrm_dst_ops = &net->xfrm.xfrm4_dst_ops; | |
2456 | break; | |
dfd56b8b | 2457 | #if IS_ENABLED(CONFIG_IPV6) |
d7c7544c AD |
2458 | case AF_INET6: |
2459 | xfrm_dst_ops = &net->xfrm.xfrm6_dst_ops; | |
2460 | break; | |
2461 | #endif | |
2462 | default: | |
2463 | BUG(); | |
2464 | } | |
2465 | *xfrm_dst_ops = *afinfo->dst_ops; | |
2466 | } | |
2467 | rtnl_unlock(); | |
2468 | ||
1da177e4 LT |
2469 | return err; |
2470 | } | |
2471 | EXPORT_SYMBOL(xfrm_policy_register_afinfo); | |
2472 | ||
2473 | int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2474 | { | |
2475 | int err = 0; | |
2476 | if (unlikely(afinfo == NULL)) | |
2477 | return -EINVAL; | |
2478 | if (unlikely(afinfo->family >= NPROTO)) | |
2479 | return -EAFNOSUPPORT; | |
418a99ac | 2480 | spin_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2481 | if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { |
2482 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) | |
2483 | err = -EINVAL; | |
2484 | else { | |
2485 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
418a99ac PJ |
2486 | rcu_assign_pointer(xfrm_policy_afinfo[afinfo->family], |
2487 | NULL); | |
1da177e4 LT |
2488 | dst_ops->kmem_cachep = NULL; |
2489 | dst_ops->check = NULL; | |
1da177e4 LT |
2490 | dst_ops->negative_advice = NULL; |
2491 | dst_ops->link_failure = NULL; | |
1da177e4 LT |
2492 | afinfo->garbage_collect = NULL; |
2493 | } | |
2494 | } | |
418a99ac PJ |
2495 | spin_unlock_bh(&xfrm_policy_afinfo_lock); |
2496 | synchronize_rcu(); | |
1da177e4 LT |
2497 | return err; |
2498 | } | |
2499 | EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); | |
2500 | ||
d7c7544c AD |
2501 | static void __net_init xfrm_dst_ops_init(struct net *net) |
2502 | { | |
2503 | struct xfrm_policy_afinfo *afinfo; | |
2504 | ||
418a99ac | 2505 | rcu_read_lock_bh(); |
56892261 | 2506 | afinfo = rcu_dereference_bh(xfrm_policy_afinfo[AF_INET]); |
d7c7544c AD |
2507 | if (afinfo) |
2508 | net->xfrm.xfrm4_dst_ops = *afinfo->dst_ops; | |
dfd56b8b | 2509 | #if IS_ENABLED(CONFIG_IPV6) |
56892261 | 2510 | afinfo = rcu_dereference_bh(xfrm_policy_afinfo[AF_INET6]); |
d7c7544c AD |
2511 | if (afinfo) |
2512 | net->xfrm.xfrm6_dst_ops = *afinfo->dst_ops; | |
2513 | #endif | |
418a99ac | 2514 | rcu_read_unlock_bh(); |
d7c7544c AD |
2515 | } |
2516 | ||
1da177e4 LT |
2517 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) |
2518 | { | |
2519 | struct xfrm_policy_afinfo *afinfo; | |
2520 | if (unlikely(family >= NPROTO)) | |
2521 | return NULL; | |
418a99ac PJ |
2522 | rcu_read_lock(); |
2523 | afinfo = rcu_dereference(xfrm_policy_afinfo[family]); | |
546be240 | 2524 | if (unlikely(!afinfo)) |
418a99ac | 2525 | rcu_read_unlock(); |
1da177e4 LT |
2526 | return afinfo; |
2527 | } | |
2528 | ||
418a99ac | 2529 | static inline void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo) |
1da177e4 | 2530 | { |
418a99ac | 2531 | rcu_read_unlock(); |
546be240 HX |
2532 | } |
2533 | ||
1da177e4 LT |
2534 | static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) |
2535 | { | |
e9dc8653 EB |
2536 | struct net_device *dev = ptr; |
2537 | ||
1da177e4 LT |
2538 | switch (event) { |
2539 | case NETDEV_DOWN: | |
c0ed1c14 | 2540 | xfrm_garbage_collect(dev_net(dev)); |
1da177e4 LT |
2541 | } |
2542 | return NOTIFY_DONE; | |
2543 | } | |
2544 | ||
2545 | static struct notifier_block xfrm_dev_notifier = { | |
d5917a35 | 2546 | .notifier_call = xfrm_dev_event, |
1da177e4 LT |
2547 | }; |
2548 | ||
558f82ef | 2549 | #ifdef CONFIG_XFRM_STATISTICS |
59c9940e | 2550 | static int __net_init xfrm_statistics_init(struct net *net) |
558f82ef | 2551 | { |
c68cd1a0 AD |
2552 | int rv; |
2553 | ||
7d720c3e | 2554 | if (snmp_mib_init((void __percpu **)net->mib.xfrm_statistics, |
1823e4c8 ED |
2555 | sizeof(struct linux_xfrm_mib), |
2556 | __alignof__(struct linux_xfrm_mib)) < 0) | |
558f82ef | 2557 | return -ENOMEM; |
c68cd1a0 AD |
2558 | rv = xfrm_proc_init(net); |
2559 | if (rv < 0) | |
7d720c3e | 2560 | snmp_mib_free((void __percpu **)net->mib.xfrm_statistics); |
c68cd1a0 | 2561 | return rv; |
558f82ef | 2562 | } |
59c9940e AD |
2563 | |
2564 | static void xfrm_statistics_fini(struct net *net) | |
2565 | { | |
c68cd1a0 | 2566 | xfrm_proc_fini(net); |
7d720c3e | 2567 | snmp_mib_free((void __percpu **)net->mib.xfrm_statistics); |
59c9940e AD |
2568 | } |
2569 | #else | |
2570 | static int __net_init xfrm_statistics_init(struct net *net) | |
2571 | { | |
2572 | return 0; | |
2573 | } | |
2574 | ||
2575 | static void xfrm_statistics_fini(struct net *net) | |
2576 | { | |
2577 | } | |
558f82ef MN |
2578 | #endif |
2579 | ||
d62ddc21 | 2580 | static int __net_init xfrm_policy_init(struct net *net) |
1da177e4 | 2581 | { |
2518c7c2 DM |
2582 | unsigned int hmask, sz; |
2583 | int dir; | |
2584 | ||
d62ddc21 AD |
2585 | if (net_eq(net, &init_net)) |
2586 | xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", | |
1da177e4 | 2587 | sizeof(struct xfrm_dst), |
e5d679f3 | 2588 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
20c2df83 | 2589 | NULL); |
1da177e4 | 2590 | |
2518c7c2 DM |
2591 | hmask = 8 - 1; |
2592 | sz = (hmask+1) * sizeof(struct hlist_head); | |
2593 | ||
93b851c1 AD |
2594 | net->xfrm.policy_byidx = xfrm_hash_alloc(sz); |
2595 | if (!net->xfrm.policy_byidx) | |
2596 | goto out_byidx; | |
8100bea7 | 2597 | net->xfrm.policy_idx_hmask = hmask; |
2518c7c2 DM |
2598 | |
2599 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
2600 | struct xfrm_policy_hash *htab; | |
2601 | ||
dc2caba7 | 2602 | net->xfrm.policy_count[dir] = 0; |
8b18f8ea | 2603 | INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]); |
2518c7c2 | 2604 | |
a35f6c5d | 2605 | htab = &net->xfrm.policy_bydst[dir]; |
44e36b42 | 2606 | htab->table = xfrm_hash_alloc(sz); |
2518c7c2 | 2607 | if (!htab->table) |
a35f6c5d AD |
2608 | goto out_bydst; |
2609 | htab->hmask = hmask; | |
2518c7c2 DM |
2610 | } |
2611 | ||
adfcf0b2 | 2612 | INIT_LIST_HEAD(&net->xfrm.policy_all); |
66caf628 | 2613 | INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize); |
d62ddc21 AD |
2614 | if (net_eq(net, &init_net)) |
2615 | register_netdevice_notifier(&xfrm_dev_notifier); | |
2616 | return 0; | |
93b851c1 | 2617 | |
a35f6c5d AD |
2618 | out_bydst: |
2619 | for (dir--; dir >= 0; dir--) { | |
2620 | struct xfrm_policy_hash *htab; | |
2621 | ||
2622 | htab = &net->xfrm.policy_bydst[dir]; | |
2623 | xfrm_hash_free(htab->table, sz); | |
2624 | } | |
2625 | xfrm_hash_free(net->xfrm.policy_byidx, sz); | |
93b851c1 AD |
2626 | out_byidx: |
2627 | return -ENOMEM; | |
d62ddc21 AD |
2628 | } |
2629 | ||
2630 | static void xfrm_policy_fini(struct net *net) | |
2631 | { | |
7c2776ee | 2632 | struct xfrm_audit audit_info; |
93b851c1 | 2633 | unsigned int sz; |
8b18f8ea | 2634 | int dir; |
93b851c1 | 2635 | |
7c2776ee AD |
2636 | flush_work(&net->xfrm.policy_hash_work); |
2637 | #ifdef CONFIG_XFRM_SUB_POLICY | |
2638 | audit_info.loginuid = -1; | |
2639 | audit_info.sessionid = -1; | |
2640 | audit_info.secid = 0; | |
2641 | xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, &audit_info); | |
2642 | #endif | |
2643 | audit_info.loginuid = -1; | |
2644 | audit_info.sessionid = -1; | |
2645 | audit_info.secid = 0; | |
2646 | xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info); | |
7c2776ee | 2647 | |
adfcf0b2 | 2648 | WARN_ON(!list_empty(&net->xfrm.policy_all)); |
93b851c1 | 2649 | |
8b18f8ea | 2650 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
a35f6c5d AD |
2651 | struct xfrm_policy_hash *htab; |
2652 | ||
8b18f8ea | 2653 | WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir])); |
a35f6c5d AD |
2654 | |
2655 | htab = &net->xfrm.policy_bydst[dir]; | |
2656 | sz = (htab->hmask + 1); | |
2657 | WARN_ON(!hlist_empty(htab->table)); | |
2658 | xfrm_hash_free(htab->table, sz); | |
8b18f8ea AD |
2659 | } |
2660 | ||
8100bea7 | 2661 | sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head); |
93b851c1 AD |
2662 | WARN_ON(!hlist_empty(net->xfrm.policy_byidx)); |
2663 | xfrm_hash_free(net->xfrm.policy_byidx, sz); | |
1da177e4 LT |
2664 | } |
2665 | ||
d62ddc21 AD |
2666 | static int __net_init xfrm_net_init(struct net *net) |
2667 | { | |
2668 | int rv; | |
2669 | ||
59c9940e AD |
2670 | rv = xfrm_statistics_init(net); |
2671 | if (rv < 0) | |
2672 | goto out_statistics; | |
d62ddc21 AD |
2673 | rv = xfrm_state_init(net); |
2674 | if (rv < 0) | |
2675 | goto out_state; | |
2676 | rv = xfrm_policy_init(net); | |
2677 | if (rv < 0) | |
2678 | goto out_policy; | |
d7c7544c | 2679 | xfrm_dst_ops_init(net); |
b27aeadb AD |
2680 | rv = xfrm_sysctl_init(net); |
2681 | if (rv < 0) | |
2682 | goto out_sysctl; | |
d62ddc21 AD |
2683 | return 0; |
2684 | ||
b27aeadb AD |
2685 | out_sysctl: |
2686 | xfrm_policy_fini(net); | |
d62ddc21 AD |
2687 | out_policy: |
2688 | xfrm_state_fini(net); | |
2689 | out_state: | |
59c9940e AD |
2690 | xfrm_statistics_fini(net); |
2691 | out_statistics: | |
d62ddc21 AD |
2692 | return rv; |
2693 | } | |
2694 | ||
2695 | static void __net_exit xfrm_net_exit(struct net *net) | |
2696 | { | |
b27aeadb | 2697 | xfrm_sysctl_fini(net); |
d62ddc21 AD |
2698 | xfrm_policy_fini(net); |
2699 | xfrm_state_fini(net); | |
59c9940e | 2700 | xfrm_statistics_fini(net); |
d62ddc21 AD |
2701 | } |
2702 | ||
2703 | static struct pernet_operations __net_initdata xfrm_net_ops = { | |
2704 | .init = xfrm_net_init, | |
2705 | .exit = xfrm_net_exit, | |
2706 | }; | |
2707 | ||
1da177e4 LT |
2708 | void __init xfrm_init(void) |
2709 | { | |
d62ddc21 | 2710 | register_pernet_subsys(&xfrm_net_ops); |
1da177e4 LT |
2711 | xfrm_input_init(); |
2712 | } | |
2713 | ||
ab5f5e8b | 2714 | #ifdef CONFIG_AUDITSYSCALL |
1486cbd7 IJ |
2715 | static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp, |
2716 | struct audit_buffer *audit_buf) | |
ab5f5e8b | 2717 | { |
875179fa PM |
2718 | struct xfrm_sec_ctx *ctx = xp->security; |
2719 | struct xfrm_selector *sel = &xp->selector; | |
2720 | ||
2721 | if (ctx) | |
ab5f5e8b | 2722 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", |
875179fa | 2723 | ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); |
ab5f5e8b | 2724 | |
875179fa | 2725 | switch(sel->family) { |
ab5f5e8b | 2726 | case AF_INET: |
21454aaa | 2727 | audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4); |
875179fa PM |
2728 | if (sel->prefixlen_s != 32) |
2729 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2730 | sel->prefixlen_s); | |
21454aaa | 2731 | audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4); |
875179fa PM |
2732 | if (sel->prefixlen_d != 32) |
2733 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2734 | sel->prefixlen_d); | |
ab5f5e8b JL |
2735 | break; |
2736 | case AF_INET6: | |
5b095d98 | 2737 | audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6); |
875179fa PM |
2738 | if (sel->prefixlen_s != 128) |
2739 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2740 | sel->prefixlen_s); | |
5b095d98 | 2741 | audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6); |
875179fa PM |
2742 | if (sel->prefixlen_d != 128) |
2743 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2744 | sel->prefixlen_d); | |
ab5f5e8b JL |
2745 | break; |
2746 | } | |
2747 | } | |
2748 | ||
68277acc | 2749 | void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, |
2532386f | 2750 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2751 | { |
2752 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2753 | |
afeb14b4 | 2754 | audit_buf = xfrm_audit_start("SPD-add"); |
ab5f5e8b JL |
2755 | if (audit_buf == NULL) |
2756 | return; | |
2532386f | 2757 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 | 2758 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
2759 | xfrm_audit_common_policyinfo(xp, audit_buf); |
2760 | audit_log_end(audit_buf); | |
2761 | } | |
2762 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_add); | |
2763 | ||
68277acc | 2764 | void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, |
2532386f | 2765 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2766 | { |
2767 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2768 | |
afeb14b4 | 2769 | audit_buf = xfrm_audit_start("SPD-delete"); |
ab5f5e8b JL |
2770 | if (audit_buf == NULL) |
2771 | return; | |
2532386f | 2772 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 | 2773 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
2774 | xfrm_audit_common_policyinfo(xp, audit_buf); |
2775 | audit_log_end(audit_buf); | |
2776 | } | |
2777 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete); | |
2778 | #endif | |
2779 | ||
80c9abaa | 2780 | #ifdef CONFIG_XFRM_MIGRATE |
bc9b35ad DM |
2781 | static bool xfrm_migrate_selector_match(const struct xfrm_selector *sel_cmp, |
2782 | const struct xfrm_selector *sel_tgt) | |
80c9abaa SS |
2783 | { |
2784 | if (sel_cmp->proto == IPSEC_ULPROTO_ANY) { | |
2785 | if (sel_tgt->family == sel_cmp->family && | |
2786 | xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr, | |
a716c119 | 2787 | sel_cmp->family) == 0 && |
80c9abaa SS |
2788 | xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr, |
2789 | sel_cmp->family) == 0 && | |
2790 | sel_tgt->prefixlen_d == sel_cmp->prefixlen_d && | |
2791 | sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) { | |
bc9b35ad | 2792 | return true; |
80c9abaa SS |
2793 | } |
2794 | } else { | |
2795 | if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) { | |
bc9b35ad | 2796 | return true; |
80c9abaa SS |
2797 | } |
2798 | } | |
bc9b35ad | 2799 | return false; |
80c9abaa SS |
2800 | } |
2801 | ||
b4b7c0b3 | 2802 | static struct xfrm_policy * xfrm_migrate_policy_find(const struct xfrm_selector *sel, |
80c9abaa SS |
2803 | u8 dir, u8 type) |
2804 | { | |
2805 | struct xfrm_policy *pol, *ret = NULL; | |
2806 | struct hlist_node *entry; | |
2807 | struct hlist_head *chain; | |
2808 | u32 priority = ~0U; | |
2809 | ||
2810 | read_lock_bh(&xfrm_policy_lock); | |
1121994c | 2811 | chain = policy_hash_direct(&init_net, &sel->daddr, &sel->saddr, sel->family, dir); |
80c9abaa SS |
2812 | hlist_for_each_entry(pol, entry, chain, bydst) { |
2813 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2814 | pol->type == type) { | |
2815 | ret = pol; | |
2816 | priority = ret->priority; | |
2817 | break; | |
2818 | } | |
2819 | } | |
8b18f8ea | 2820 | chain = &init_net.xfrm.policy_inexact[dir]; |
80c9abaa SS |
2821 | hlist_for_each_entry(pol, entry, chain, bydst) { |
2822 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2823 | pol->type == type && | |
2824 | pol->priority < priority) { | |
2825 | ret = pol; | |
2826 | break; | |
2827 | } | |
2828 | } | |
2829 | ||
2830 | if (ret) | |
2831 | xfrm_pol_hold(ret); | |
2832 | ||
2833 | read_unlock_bh(&xfrm_policy_lock); | |
2834 | ||
2835 | return ret; | |
2836 | } | |
2837 | ||
dd701754 | 2838 | static int migrate_tmpl_match(const struct xfrm_migrate *m, const struct xfrm_tmpl *t) |
80c9abaa SS |
2839 | { |
2840 | int match = 0; | |
2841 | ||
2842 | if (t->mode == m->mode && t->id.proto == m->proto && | |
2843 | (m->reqid == 0 || t->reqid == m->reqid)) { | |
2844 | switch (t->mode) { | |
2845 | case XFRM_MODE_TUNNEL: | |
2846 | case XFRM_MODE_BEET: | |
2847 | if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr, | |
2848 | m->old_family) == 0 && | |
2849 | xfrm_addr_cmp(&t->saddr, &m->old_saddr, | |
2850 | m->old_family) == 0) { | |
2851 | match = 1; | |
2852 | } | |
2853 | break; | |
2854 | case XFRM_MODE_TRANSPORT: | |
2855 | /* in case of transport mode, template does not store | |
2856 | any IP addresses, hence we just compare mode and | |
2857 | protocol */ | |
2858 | match = 1; | |
2859 | break; | |
2860 | default: | |
2861 | break; | |
2862 | } | |
2863 | } | |
2864 | return match; | |
2865 | } | |
2866 | ||
2867 | /* update endpoint address(es) of template(s) */ | |
2868 | static int xfrm_policy_migrate(struct xfrm_policy *pol, | |
2869 | struct xfrm_migrate *m, int num_migrate) | |
2870 | { | |
2871 | struct xfrm_migrate *mp; | |
80c9abaa SS |
2872 | int i, j, n = 0; |
2873 | ||
2874 | write_lock_bh(&pol->lock); | |
12a169e7 | 2875 | if (unlikely(pol->walk.dead)) { |
80c9abaa SS |
2876 | /* target policy has been deleted */ |
2877 | write_unlock_bh(&pol->lock); | |
2878 | return -ENOENT; | |
2879 | } | |
2880 | ||
2881 | for (i = 0; i < pol->xfrm_nr; i++) { | |
2882 | for (j = 0, mp = m; j < num_migrate; j++, mp++) { | |
2883 | if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i])) | |
2884 | continue; | |
2885 | n++; | |
1bfcb10f HX |
2886 | if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL && |
2887 | pol->xfrm_vec[i].mode != XFRM_MODE_BEET) | |
80c9abaa SS |
2888 | continue; |
2889 | /* update endpoints */ | |
2890 | memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr, | |
2891 | sizeof(pol->xfrm_vec[i].id.daddr)); | |
2892 | memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr, | |
2893 | sizeof(pol->xfrm_vec[i].saddr)); | |
2894 | pol->xfrm_vec[i].encap_family = mp->new_family; | |
2895 | /* flush bundles */ | |
80c802f3 | 2896 | atomic_inc(&pol->genid); |
80c9abaa SS |
2897 | } |
2898 | } | |
2899 | ||
2900 | write_unlock_bh(&pol->lock); | |
2901 | ||
2902 | if (!n) | |
2903 | return -ENODATA; | |
2904 | ||
2905 | return 0; | |
2906 | } | |
2907 | ||
dd701754 | 2908 | static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate) |
80c9abaa SS |
2909 | { |
2910 | int i, j; | |
2911 | ||
2912 | if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) | |
2913 | return -EINVAL; | |
2914 | ||
2915 | for (i = 0; i < num_migrate; i++) { | |
2916 | if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr, | |
2917 | m[i].old_family) == 0) && | |
2918 | (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr, | |
2919 | m[i].old_family) == 0)) | |
2920 | return -EINVAL; | |
2921 | if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) || | |
2922 | xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) | |
2923 | return -EINVAL; | |
2924 | ||
2925 | /* check if there is any duplicated entry */ | |
2926 | for (j = i + 1; j < num_migrate; j++) { | |
2927 | if (!memcmp(&m[i].old_daddr, &m[j].old_daddr, | |
2928 | sizeof(m[i].old_daddr)) && | |
2929 | !memcmp(&m[i].old_saddr, &m[j].old_saddr, | |
2930 | sizeof(m[i].old_saddr)) && | |
2931 | m[i].proto == m[j].proto && | |
2932 | m[i].mode == m[j].mode && | |
2933 | m[i].reqid == m[j].reqid && | |
2934 | m[i].old_family == m[j].old_family) | |
2935 | return -EINVAL; | |
2936 | } | |
2937 | } | |
2938 | ||
2939 | return 0; | |
2940 | } | |
2941 | ||
b4b7c0b3 | 2942 | int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, |
13c1d189 AE |
2943 | struct xfrm_migrate *m, int num_migrate, |
2944 | struct xfrm_kmaddress *k) | |
80c9abaa SS |
2945 | { |
2946 | int i, err, nx_cur = 0, nx_new = 0; | |
2947 | struct xfrm_policy *pol = NULL; | |
2948 | struct xfrm_state *x, *xc; | |
2949 | struct xfrm_state *x_cur[XFRM_MAX_DEPTH]; | |
2950 | struct xfrm_state *x_new[XFRM_MAX_DEPTH]; | |
2951 | struct xfrm_migrate *mp; | |
2952 | ||
2953 | if ((err = xfrm_migrate_check(m, num_migrate)) < 0) | |
2954 | goto out; | |
2955 | ||
2956 | /* Stage 1 - find policy */ | |
2957 | if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) { | |
2958 | err = -ENOENT; | |
2959 | goto out; | |
2960 | } | |
2961 | ||
2962 | /* Stage 2 - find and update state(s) */ | |
2963 | for (i = 0, mp = m; i < num_migrate; i++, mp++) { | |
2964 | if ((x = xfrm_migrate_state_find(mp))) { | |
2965 | x_cur[nx_cur] = x; | |
2966 | nx_cur++; | |
2967 | if ((xc = xfrm_state_migrate(x, mp))) { | |
2968 | x_new[nx_new] = xc; | |
2969 | nx_new++; | |
2970 | } else { | |
2971 | err = -ENODATA; | |
2972 | goto restore_state; | |
2973 | } | |
2974 | } | |
2975 | } | |
2976 | ||
2977 | /* Stage 3 - update policy */ | |
2978 | if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0) | |
2979 | goto restore_state; | |
2980 | ||
2981 | /* Stage 4 - delete old state(s) */ | |
2982 | if (nx_cur) { | |
2983 | xfrm_states_put(x_cur, nx_cur); | |
2984 | xfrm_states_delete(x_cur, nx_cur); | |
2985 | } | |
2986 | ||
2987 | /* Stage 5 - announce */ | |
13c1d189 | 2988 | km_migrate(sel, dir, type, m, num_migrate, k); |
80c9abaa SS |
2989 | |
2990 | xfrm_pol_put(pol); | |
2991 | ||
2992 | return 0; | |
2993 | out: | |
2994 | return err; | |
2995 | ||
2996 | restore_state: | |
2997 | if (pol) | |
2998 | xfrm_pol_put(pol); | |
2999 | if (nx_cur) | |
3000 | xfrm_states_put(x_cur, nx_cur); | |
3001 | if (nx_new) | |
3002 | xfrm_states_delete(x_new, nx_new); | |
3003 | ||
3004 | return err; | |
3005 | } | |
e610e679 | 3006 | EXPORT_SYMBOL(xfrm_migrate); |
80c9abaa | 3007 | #endif |