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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 | ||
a0073fe1 SK |
38 | #define XFRM_QUEUE_TMO_MIN ((unsigned)(HZ/10)) |
39 | #define XFRM_QUEUE_TMO_MAX ((unsigned)(60*HZ)) | |
40 | #define XFRM_MAX_QUEUE_LEN 100 | |
41 | ||
b8c203b2 SK |
42 | struct xfrm_flo { |
43 | struct dst_entry *dst_orig; | |
44 | u8 flags; | |
45 | }; | |
46 | ||
418a99ac PJ |
47 | static DEFINE_SPINLOCK(xfrm_policy_afinfo_lock); |
48 | static struct xfrm_policy_afinfo __rcu *xfrm_policy_afinfo[NPROTO] | |
49 | __read_mostly; | |
1da177e4 | 50 | |
e18b890b | 51 | static struct kmem_cache *xfrm_dst_cache __read_mostly; |
1da177e4 | 52 | |
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); |
a0073fe1 | 56 | static void xfrm_policy_queue_process(unsigned long arg); |
1da177e4 | 57 | |
12bfa8bd | 58 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir); |
29fa0b30 WY |
59 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, |
60 | int dir); | |
61 | ||
bc9b35ad | 62 | static inline bool |
200ce96e | 63 | __xfrm4_selector_match(const struct xfrm_selector *sel, const struct flowi *fl) |
77681021 | 64 | { |
7e1dc7b6 DM |
65 | const struct flowi4 *fl4 = &fl->u.ip4; |
66 | ||
26bff940 AD |
67 | return addr4_match(fl4->daddr, sel->daddr.a4, sel->prefixlen_d) && |
68 | addr4_match(fl4->saddr, sel->saddr.a4, sel->prefixlen_s) && | |
7e1dc7b6 DM |
69 | !((xfrm_flowi_dport(fl, &fl4->uli) ^ sel->dport) & sel->dport_mask) && |
70 | !((xfrm_flowi_sport(fl, &fl4->uli) ^ sel->sport) & sel->sport_mask) && | |
71 | (fl4->flowi4_proto == sel->proto || !sel->proto) && | |
72 | (fl4->flowi4_oif == sel->ifindex || !sel->ifindex); | |
77681021 AM |
73 | } |
74 | ||
bc9b35ad | 75 | static inline bool |
200ce96e | 76 | __xfrm6_selector_match(const struct xfrm_selector *sel, const struct flowi *fl) |
77681021 | 77 | { |
7e1dc7b6 DM |
78 | const struct flowi6 *fl6 = &fl->u.ip6; |
79 | ||
80 | return addr_match(&fl6->daddr, &sel->daddr, sel->prefixlen_d) && | |
81 | addr_match(&fl6->saddr, &sel->saddr, sel->prefixlen_s) && | |
82 | !((xfrm_flowi_dport(fl, &fl6->uli) ^ sel->dport) & sel->dport_mask) && | |
83 | !((xfrm_flowi_sport(fl, &fl6->uli) ^ sel->sport) & sel->sport_mask) && | |
84 | (fl6->flowi6_proto == sel->proto || !sel->proto) && | |
85 | (fl6->flowi6_oif == sel->ifindex || !sel->ifindex); | |
77681021 AM |
86 | } |
87 | ||
bc9b35ad DM |
88 | bool xfrm_selector_match(const struct xfrm_selector *sel, const struct flowi *fl, |
89 | unsigned short family) | |
77681021 AM |
90 | { |
91 | switch (family) { | |
92 | case AF_INET: | |
93 | return __xfrm4_selector_match(sel, fl); | |
94 | case AF_INET6: | |
95 | return __xfrm6_selector_match(sel, fl); | |
96 | } | |
bc9b35ad | 97 | return false; |
77681021 AM |
98 | } |
99 | ||
ef8531b6 ED |
100 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) |
101 | { | |
102 | struct xfrm_policy_afinfo *afinfo; | |
103 | ||
104 | if (unlikely(family >= NPROTO)) | |
105 | return NULL; | |
106 | rcu_read_lock(); | |
107 | afinfo = rcu_dereference(xfrm_policy_afinfo[family]); | |
108 | if (unlikely(!afinfo)) | |
109 | rcu_read_unlock(); | |
110 | return afinfo; | |
111 | } | |
112 | ||
113 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo) | |
114 | { | |
115 | rcu_read_unlock(); | |
116 | } | |
117 | ||
42a7b32b DA |
118 | static inline struct dst_entry *__xfrm_dst_lookup(struct net *net, |
119 | int tos, int oif, | |
6418c4e0 DM |
120 | const xfrm_address_t *saddr, |
121 | const xfrm_address_t *daddr, | |
9bb182a7 YH |
122 | int family) |
123 | { | |
124 | struct xfrm_policy_afinfo *afinfo; | |
125 | struct dst_entry *dst; | |
126 | ||
127 | afinfo = xfrm_policy_get_afinfo(family); | |
128 | if (unlikely(afinfo == NULL)) | |
129 | return ERR_PTR(-EAFNOSUPPORT); | |
130 | ||
42a7b32b | 131 | dst = afinfo->dst_lookup(net, tos, oif, saddr, daddr); |
9bb182a7 YH |
132 | |
133 | xfrm_policy_put_afinfo(afinfo); | |
134 | ||
135 | return dst; | |
136 | } | |
137 | ||
42a7b32b DA |
138 | static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, |
139 | int tos, int oif, | |
9bb182a7 YH |
140 | xfrm_address_t *prev_saddr, |
141 | xfrm_address_t *prev_daddr, | |
25ee3286 | 142 | int family) |
1da177e4 | 143 | { |
c5b3cf46 | 144 | struct net *net = xs_net(x); |
66cdb3ca HX |
145 | xfrm_address_t *saddr = &x->props.saddr; |
146 | xfrm_address_t *daddr = &x->id.daddr; | |
66cdb3ca HX |
147 | struct dst_entry *dst; |
148 | ||
9bb182a7 | 149 | if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) { |
66cdb3ca | 150 | saddr = x->coaddr; |
9bb182a7 YH |
151 | daddr = prev_daddr; |
152 | } | |
153 | if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) { | |
154 | saddr = prev_saddr; | |
66cdb3ca | 155 | daddr = x->coaddr; |
9bb182a7 | 156 | } |
1da177e4 | 157 | |
42a7b32b | 158 | dst = __xfrm_dst_lookup(net, tos, oif, saddr, daddr, family); |
9bb182a7 YH |
159 | |
160 | if (!IS_ERR(dst)) { | |
161 | if (prev_saddr != saddr) | |
162 | memcpy(prev_saddr, saddr, sizeof(*prev_saddr)); | |
163 | if (prev_daddr != daddr) | |
164 | memcpy(prev_daddr, daddr, sizeof(*prev_daddr)); | |
165 | } | |
1da177e4 | 166 | |
66cdb3ca | 167 | return dst; |
1da177e4 | 168 | } |
1da177e4 | 169 | |
1da177e4 LT |
170 | static inline unsigned long make_jiffies(long secs) |
171 | { | |
172 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
173 | return MAX_SCHEDULE_TIMEOUT-1; | |
174 | else | |
a716c119 | 175 | return secs*HZ; |
1da177e4 LT |
176 | } |
177 | ||
178 | static void xfrm_policy_timer(unsigned long data) | |
179 | { | |
3e94c2dc | 180 | struct xfrm_policy *xp = (struct xfrm_policy *)data; |
9d729f72 | 181 | unsigned long now = get_seconds(); |
1da177e4 LT |
182 | long next = LONG_MAX; |
183 | int warn = 0; | |
184 | int dir; | |
185 | ||
186 | read_lock(&xp->lock); | |
187 | ||
ea2dea9d | 188 | if (unlikely(xp->walk.dead)) |
1da177e4 LT |
189 | goto out; |
190 | ||
77d8d7a6 | 191 | dir = xfrm_policy_id2dir(xp->index); |
1da177e4 LT |
192 | |
193 | if (xp->lft.hard_add_expires_seconds) { | |
194 | long tmo = xp->lft.hard_add_expires_seconds + | |
195 | xp->curlft.add_time - now; | |
196 | if (tmo <= 0) | |
197 | goto expired; | |
198 | if (tmo < next) | |
199 | next = tmo; | |
200 | } | |
201 | if (xp->lft.hard_use_expires_seconds) { | |
202 | long tmo = xp->lft.hard_use_expires_seconds + | |
203 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
204 | if (tmo <= 0) | |
205 | goto expired; | |
206 | if (tmo < next) | |
207 | next = tmo; | |
208 | } | |
209 | if (xp->lft.soft_add_expires_seconds) { | |
210 | long tmo = xp->lft.soft_add_expires_seconds + | |
211 | xp->curlft.add_time - now; | |
212 | if (tmo <= 0) { | |
213 | warn = 1; | |
214 | tmo = XFRM_KM_TIMEOUT; | |
215 | } | |
216 | if (tmo < next) | |
217 | next = tmo; | |
218 | } | |
219 | if (xp->lft.soft_use_expires_seconds) { | |
220 | long tmo = xp->lft.soft_use_expires_seconds + | |
221 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
222 | if (tmo <= 0) { | |
223 | warn = 1; | |
224 | tmo = XFRM_KM_TIMEOUT; | |
225 | } | |
226 | if (tmo < next) | |
227 | next = tmo; | |
228 | } | |
229 | ||
230 | if (warn) | |
6c5c8ca7 | 231 | km_policy_expired(xp, dir, 0, 0); |
1da177e4 LT |
232 | if (next != LONG_MAX && |
233 | !mod_timer(&xp->timer, jiffies + make_jiffies(next))) | |
234 | xfrm_pol_hold(xp); | |
235 | ||
236 | out: | |
237 | read_unlock(&xp->lock); | |
238 | xfrm_pol_put(xp); | |
239 | return; | |
240 | ||
241 | expired: | |
242 | read_unlock(&xp->lock); | |
4666faab | 243 | if (!xfrm_policy_delete(xp, dir)) |
6c5c8ca7 | 244 | km_policy_expired(xp, dir, 1, 0); |
1da177e4 LT |
245 | xfrm_pol_put(xp); |
246 | } | |
247 | ||
fe1a5f03 TT |
248 | static struct flow_cache_object *xfrm_policy_flo_get(struct flow_cache_object *flo) |
249 | { | |
250 | struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo); | |
251 | ||
252 | if (unlikely(pol->walk.dead)) | |
253 | flo = NULL; | |
254 | else | |
255 | xfrm_pol_hold(pol); | |
256 | ||
257 | return flo; | |
258 | } | |
259 | ||
260 | static int xfrm_policy_flo_check(struct flow_cache_object *flo) | |
261 | { | |
262 | struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo); | |
263 | ||
264 | return !pol->walk.dead; | |
265 | } | |
266 | ||
267 | static void xfrm_policy_flo_delete(struct flow_cache_object *flo) | |
268 | { | |
269 | xfrm_pol_put(container_of(flo, struct xfrm_policy, flo)); | |
270 | } | |
271 | ||
272 | static const struct flow_cache_ops xfrm_policy_fc_ops = { | |
273 | .get = xfrm_policy_flo_get, | |
274 | .check = xfrm_policy_flo_check, | |
275 | .delete = xfrm_policy_flo_delete, | |
276 | }; | |
1da177e4 LT |
277 | |
278 | /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2 | |
279 | * SPD calls. | |
280 | */ | |
281 | ||
0331b1f3 | 282 | struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp) |
1da177e4 LT |
283 | { |
284 | struct xfrm_policy *policy; | |
285 | ||
0da974f4 | 286 | policy = kzalloc(sizeof(struct xfrm_policy), gfp); |
1da177e4 LT |
287 | |
288 | if (policy) { | |
0331b1f3 | 289 | write_pnet(&policy->xp_net, net); |
12a169e7 | 290 | INIT_LIST_HEAD(&policy->walk.all); |
2518c7c2 DM |
291 | INIT_HLIST_NODE(&policy->bydst); |
292 | INIT_HLIST_NODE(&policy->byidx); | |
1da177e4 | 293 | rwlock_init(&policy->lock); |
2518c7c2 | 294 | atomic_set(&policy->refcnt, 1); |
a0073fe1 | 295 | skb_queue_head_init(&policy->polq.hold_queue); |
b24b8a24 PE |
296 | setup_timer(&policy->timer, xfrm_policy_timer, |
297 | (unsigned long)policy); | |
a0073fe1 SK |
298 | setup_timer(&policy->polq.hold_timer, xfrm_policy_queue_process, |
299 | (unsigned long)policy); | |
fe1a5f03 | 300 | policy->flo.ops = &xfrm_policy_fc_ops; |
1da177e4 LT |
301 | } |
302 | return policy; | |
303 | } | |
304 | EXPORT_SYMBOL(xfrm_policy_alloc); | |
305 | ||
306 | /* Destroy xfrm_policy: descendant resources must be released to this moment. */ | |
307 | ||
64c31b3f | 308 | void xfrm_policy_destroy(struct xfrm_policy *policy) |
1da177e4 | 309 | { |
12a169e7 | 310 | BUG_ON(!policy->walk.dead); |
1da177e4 | 311 | |
0659eea9 | 312 | if (del_timer(&policy->timer) || del_timer(&policy->polq.hold_timer)) |
1da177e4 LT |
313 | BUG(); |
314 | ||
03e1ad7b | 315 | security_xfrm_policy_free(policy->security); |
1da177e4 LT |
316 | kfree(policy); |
317 | } | |
64c31b3f | 318 | EXPORT_SYMBOL(xfrm_policy_destroy); |
1da177e4 | 319 | |
1da177e4 LT |
320 | /* Rule must be locked. Release descentant resources, announce |
321 | * entry dead. The rule must be unlinked from lists to the moment. | |
322 | */ | |
323 | ||
324 | static void xfrm_policy_kill(struct xfrm_policy *policy) | |
325 | { | |
12a169e7 | 326 | policy->walk.dead = 1; |
1da177e4 | 327 | |
285ead17 | 328 | atomic_inc(&policy->genid); |
1da177e4 | 329 | |
e7d8f6cb SK |
330 | if (del_timer(&policy->polq.hold_timer)) |
331 | xfrm_pol_put(policy); | |
1ee5e667 | 332 | skb_queue_purge(&policy->polq.hold_queue); |
a0073fe1 | 333 | |
285ead17 TT |
334 | if (del_timer(&policy->timer)) |
335 | xfrm_pol_put(policy); | |
336 | ||
337 | xfrm_pol_put(policy); | |
1da177e4 LT |
338 | } |
339 | ||
2518c7c2 DM |
340 | static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024; |
341 | ||
e92303f8 | 342 | static inline unsigned int idx_hash(struct net *net, u32 index) |
2518c7c2 | 343 | { |
e92303f8 | 344 | return __idx_hash(index, net->xfrm.policy_idx_hmask); |
2518c7c2 DM |
345 | } |
346 | ||
b58555f1 CG |
347 | /* calculate policy hash thresholds */ |
348 | static void __get_hash_thresh(struct net *net, | |
349 | unsigned short family, int dir, | |
350 | u8 *dbits, u8 *sbits) | |
351 | { | |
352 | switch (family) { | |
353 | case AF_INET: | |
354 | *dbits = net->xfrm.policy_bydst[dir].dbits4; | |
355 | *sbits = net->xfrm.policy_bydst[dir].sbits4; | |
356 | break; | |
357 | ||
358 | case AF_INET6: | |
359 | *dbits = net->xfrm.policy_bydst[dir].dbits6; | |
360 | *sbits = net->xfrm.policy_bydst[dir].sbits6; | |
361 | break; | |
362 | ||
363 | default: | |
364 | *dbits = 0; | |
365 | *sbits = 0; | |
366 | } | |
367 | } | |
368 | ||
5f803b58 DM |
369 | static struct hlist_head *policy_hash_bysel(struct net *net, |
370 | const struct xfrm_selector *sel, | |
371 | unsigned short family, int dir) | |
2518c7c2 | 372 | { |
1121994c | 373 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
b58555f1 CG |
374 | unsigned int hash; |
375 | u8 dbits; | |
376 | u8 sbits; | |
377 | ||
378 | __get_hash_thresh(net, family, dir, &dbits, &sbits); | |
379 | hash = __sel_hash(sel, family, hmask, dbits, sbits); | |
2518c7c2 DM |
380 | |
381 | return (hash == hmask + 1 ? | |
1121994c AD |
382 | &net->xfrm.policy_inexact[dir] : |
383 | net->xfrm.policy_bydst[dir].table + hash); | |
2518c7c2 DM |
384 | } |
385 | ||
5f803b58 DM |
386 | static struct hlist_head *policy_hash_direct(struct net *net, |
387 | const xfrm_address_t *daddr, | |
388 | const xfrm_address_t *saddr, | |
389 | unsigned short family, int dir) | |
2518c7c2 | 390 | { |
1121994c | 391 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
b58555f1 CG |
392 | unsigned int hash; |
393 | u8 dbits; | |
394 | u8 sbits; | |
395 | ||
396 | __get_hash_thresh(net, family, dir, &dbits, &sbits); | |
397 | hash = __addr_hash(daddr, saddr, family, hmask, dbits, sbits); | |
2518c7c2 | 398 | |
1121994c | 399 | return net->xfrm.policy_bydst[dir].table + hash; |
2518c7c2 DM |
400 | } |
401 | ||
b58555f1 CG |
402 | static void xfrm_dst_hash_transfer(struct net *net, |
403 | struct hlist_head *list, | |
2518c7c2 | 404 | struct hlist_head *ndsttable, |
b58555f1 CG |
405 | unsigned int nhashmask, |
406 | int dir) | |
2518c7c2 | 407 | { |
b67bfe0d | 408 | struct hlist_node *tmp, *entry0 = NULL; |
2518c7c2 | 409 | struct xfrm_policy *pol; |
b791160b | 410 | unsigned int h0 = 0; |
b58555f1 CG |
411 | u8 dbits; |
412 | u8 sbits; | |
2518c7c2 | 413 | |
b791160b | 414 | redo: |
b67bfe0d | 415 | hlist_for_each_entry_safe(pol, tmp, list, bydst) { |
2518c7c2 DM |
416 | unsigned int h; |
417 | ||
b58555f1 | 418 | __get_hash_thresh(net, pol->family, dir, &dbits, &sbits); |
2518c7c2 | 419 | h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr, |
b58555f1 | 420 | pol->family, nhashmask, dbits, sbits); |
b791160b | 421 | if (!entry0) { |
b67bfe0d | 422 | hlist_del(&pol->bydst); |
b791160b YH |
423 | hlist_add_head(&pol->bydst, ndsttable+h); |
424 | h0 = h; | |
425 | } else { | |
426 | if (h != h0) | |
427 | continue; | |
b67bfe0d | 428 | hlist_del(&pol->bydst); |
1d023284 | 429 | hlist_add_behind(&pol->bydst, entry0); |
b791160b | 430 | } |
b67bfe0d | 431 | entry0 = &pol->bydst; |
b791160b YH |
432 | } |
433 | if (!hlist_empty(list)) { | |
434 | entry0 = NULL; | |
435 | goto redo; | |
2518c7c2 DM |
436 | } |
437 | } | |
438 | ||
439 | static void xfrm_idx_hash_transfer(struct hlist_head *list, | |
440 | struct hlist_head *nidxtable, | |
441 | unsigned int nhashmask) | |
442 | { | |
b67bfe0d | 443 | struct hlist_node *tmp; |
2518c7c2 DM |
444 | struct xfrm_policy *pol; |
445 | ||
b67bfe0d | 446 | hlist_for_each_entry_safe(pol, tmp, list, byidx) { |
2518c7c2 DM |
447 | unsigned int h; |
448 | ||
449 | h = __idx_hash(pol->index, nhashmask); | |
450 | hlist_add_head(&pol->byidx, nidxtable+h); | |
451 | } | |
452 | } | |
453 | ||
454 | static unsigned long xfrm_new_hash_mask(unsigned int old_hmask) | |
455 | { | |
456 | return ((old_hmask + 1) << 1) - 1; | |
457 | } | |
458 | ||
66caf628 | 459 | static void xfrm_bydst_resize(struct net *net, int dir) |
2518c7c2 | 460 | { |
66caf628 | 461 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
462 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
463 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
66caf628 | 464 | struct hlist_head *odst = net->xfrm.policy_bydst[dir].table; |
44e36b42 | 465 | struct hlist_head *ndst = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
466 | int i; |
467 | ||
468 | if (!ndst) | |
469 | return; | |
470 | ||
283bc9f3 | 471 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
2518c7c2 DM |
472 | |
473 | for (i = hmask; i >= 0; i--) | |
b58555f1 | 474 | xfrm_dst_hash_transfer(net, odst + i, ndst, nhashmask, dir); |
2518c7c2 | 475 | |
66caf628 AD |
476 | net->xfrm.policy_bydst[dir].table = ndst; |
477 | net->xfrm.policy_bydst[dir].hmask = nhashmask; | |
2518c7c2 | 478 | |
283bc9f3 | 479 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
2518c7c2 | 480 | |
44e36b42 | 481 | xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
482 | } |
483 | ||
66caf628 | 484 | static void xfrm_byidx_resize(struct net *net, int total) |
2518c7c2 | 485 | { |
66caf628 | 486 | unsigned int hmask = net->xfrm.policy_idx_hmask; |
2518c7c2 DM |
487 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
488 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
66caf628 | 489 | struct hlist_head *oidx = net->xfrm.policy_byidx; |
44e36b42 | 490 | struct hlist_head *nidx = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
491 | int i; |
492 | ||
493 | if (!nidx) | |
494 | return; | |
495 | ||
283bc9f3 | 496 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
2518c7c2 DM |
497 | |
498 | for (i = hmask; i >= 0; i--) | |
499 | xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask); | |
500 | ||
66caf628 AD |
501 | net->xfrm.policy_byidx = nidx; |
502 | net->xfrm.policy_idx_hmask = nhashmask; | |
2518c7c2 | 503 | |
283bc9f3 | 504 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
2518c7c2 | 505 | |
44e36b42 | 506 | xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
507 | } |
508 | ||
66caf628 | 509 | static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total) |
2518c7c2 | 510 | { |
66caf628 AD |
511 | unsigned int cnt = net->xfrm.policy_count[dir]; |
512 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; | |
2518c7c2 DM |
513 | |
514 | if (total) | |
515 | *total += cnt; | |
516 | ||
517 | if ((hmask + 1) < xfrm_policy_hashmax && | |
518 | cnt > hmask) | |
519 | return 1; | |
520 | ||
521 | return 0; | |
522 | } | |
523 | ||
66caf628 | 524 | static inline int xfrm_byidx_should_resize(struct net *net, int total) |
2518c7c2 | 525 | { |
66caf628 | 526 | unsigned int hmask = net->xfrm.policy_idx_hmask; |
2518c7c2 DM |
527 | |
528 | if ((hmask + 1) < xfrm_policy_hashmax && | |
529 | total > hmask) | |
530 | return 1; | |
531 | ||
532 | return 0; | |
533 | } | |
534 | ||
e071041b | 535 | void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si) |
ecfd6b18 | 536 | { |
283bc9f3 | 537 | read_lock_bh(&net->xfrm.xfrm_policy_lock); |
e071041b AD |
538 | si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN]; |
539 | si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT]; | |
540 | si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD]; | |
541 | si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX]; | |
542 | si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX]; | |
543 | si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX]; | |
544 | si->spdhcnt = net->xfrm.policy_idx_hmask; | |
ecfd6b18 | 545 | si->spdhmcnt = xfrm_policy_hashmax; |
283bc9f3 | 546 | read_unlock_bh(&net->xfrm.xfrm_policy_lock); |
ecfd6b18 JHS |
547 | } |
548 | EXPORT_SYMBOL(xfrm_spd_getinfo); | |
2518c7c2 | 549 | |
ecfd6b18 | 550 | static DEFINE_MUTEX(hash_resize_mutex); |
66caf628 | 551 | static void xfrm_hash_resize(struct work_struct *work) |
2518c7c2 | 552 | { |
66caf628 | 553 | struct net *net = container_of(work, struct net, xfrm.policy_hash_work); |
2518c7c2 DM |
554 | int dir, total; |
555 | ||
556 | mutex_lock(&hash_resize_mutex); | |
557 | ||
558 | total = 0; | |
53c2e285 | 559 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
66caf628 AD |
560 | if (xfrm_bydst_should_resize(net, dir, &total)) |
561 | xfrm_bydst_resize(net, dir); | |
2518c7c2 | 562 | } |
66caf628 AD |
563 | if (xfrm_byidx_should_resize(net, total)) |
564 | xfrm_byidx_resize(net, total); | |
2518c7c2 DM |
565 | |
566 | mutex_unlock(&hash_resize_mutex); | |
567 | } | |
568 | ||
880a6fab CG |
569 | static void xfrm_hash_rebuild(struct work_struct *work) |
570 | { | |
571 | struct net *net = container_of(work, struct net, | |
572 | xfrm.policy_hthresh.work); | |
573 | unsigned int hmask; | |
574 | struct xfrm_policy *pol; | |
575 | struct xfrm_policy *policy; | |
576 | struct hlist_head *chain; | |
577 | struct hlist_head *odst; | |
578 | struct hlist_node *newpos; | |
579 | int i; | |
580 | int dir; | |
581 | unsigned seq; | |
582 | u8 lbits4, rbits4, lbits6, rbits6; | |
583 | ||
584 | mutex_lock(&hash_resize_mutex); | |
585 | ||
586 | /* read selector prefixlen thresholds */ | |
587 | do { | |
588 | seq = read_seqbegin(&net->xfrm.policy_hthresh.lock); | |
589 | ||
590 | lbits4 = net->xfrm.policy_hthresh.lbits4; | |
591 | rbits4 = net->xfrm.policy_hthresh.rbits4; | |
592 | lbits6 = net->xfrm.policy_hthresh.lbits6; | |
593 | rbits6 = net->xfrm.policy_hthresh.rbits6; | |
594 | } while (read_seqretry(&net->xfrm.policy_hthresh.lock, seq)); | |
595 | ||
596 | write_lock_bh(&net->xfrm.xfrm_policy_lock); | |
597 | ||
598 | /* reset the bydst and inexact table in all directions */ | |
53c2e285 | 599 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
880a6fab CG |
600 | INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]); |
601 | hmask = net->xfrm.policy_bydst[dir].hmask; | |
602 | odst = net->xfrm.policy_bydst[dir].table; | |
603 | for (i = hmask; i >= 0; i--) | |
604 | INIT_HLIST_HEAD(odst + i); | |
605 | if ((dir & XFRM_POLICY_MASK) == XFRM_POLICY_OUT) { | |
606 | /* dir out => dst = remote, src = local */ | |
607 | net->xfrm.policy_bydst[dir].dbits4 = rbits4; | |
608 | net->xfrm.policy_bydst[dir].sbits4 = lbits4; | |
609 | net->xfrm.policy_bydst[dir].dbits6 = rbits6; | |
610 | net->xfrm.policy_bydst[dir].sbits6 = lbits6; | |
611 | } else { | |
612 | /* dir in/fwd => dst = local, src = remote */ | |
613 | net->xfrm.policy_bydst[dir].dbits4 = lbits4; | |
614 | net->xfrm.policy_bydst[dir].sbits4 = rbits4; | |
615 | net->xfrm.policy_bydst[dir].dbits6 = lbits6; | |
616 | net->xfrm.policy_bydst[dir].sbits6 = rbits6; | |
617 | } | |
618 | } | |
619 | ||
620 | /* re-insert all policies by order of creation */ | |
621 | list_for_each_entry_reverse(policy, &net->xfrm.policy_all, walk.all) { | |
622 | newpos = NULL; | |
623 | chain = policy_hash_bysel(net, &policy->selector, | |
624 | policy->family, | |
625 | xfrm_policy_id2dir(policy->index)); | |
626 | hlist_for_each_entry(pol, chain, bydst) { | |
627 | if (policy->priority >= pol->priority) | |
628 | newpos = &pol->bydst; | |
629 | else | |
630 | break; | |
631 | } | |
632 | if (newpos) | |
633 | hlist_add_behind(&policy->bydst, newpos); | |
634 | else | |
635 | hlist_add_head(&policy->bydst, chain); | |
636 | } | |
637 | ||
638 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); | |
639 | ||
640 | mutex_unlock(&hash_resize_mutex); | |
641 | } | |
642 | ||
643 | void xfrm_policy_hash_rebuild(struct net *net) | |
644 | { | |
645 | schedule_work(&net->xfrm.policy_hthresh.work); | |
646 | } | |
647 | EXPORT_SYMBOL(xfrm_policy_hash_rebuild); | |
648 | ||
1da177e4 LT |
649 | /* Generate new index... KAME seems to generate them ordered by cost |
650 | * of an absolute inpredictability of ordering of rules. This will not pass. */ | |
e682adf0 | 651 | static u32 xfrm_gen_index(struct net *net, int dir, u32 index) |
1da177e4 | 652 | { |
1da177e4 LT |
653 | static u32 idx_generator; |
654 | ||
655 | for (;;) { | |
2518c7c2 DM |
656 | struct hlist_head *list; |
657 | struct xfrm_policy *p; | |
658 | u32 idx; | |
659 | int found; | |
660 | ||
e682adf0 FD |
661 | if (!index) { |
662 | idx = (idx_generator | dir); | |
663 | idx_generator += 8; | |
664 | } else { | |
665 | idx = index; | |
666 | index = 0; | |
667 | } | |
668 | ||
1da177e4 LT |
669 | if (idx == 0) |
670 | idx = 8; | |
1121994c | 671 | list = net->xfrm.policy_byidx + idx_hash(net, idx); |
2518c7c2 | 672 | found = 0; |
b67bfe0d | 673 | hlist_for_each_entry(p, list, byidx) { |
2518c7c2 DM |
674 | if (p->index == idx) { |
675 | found = 1; | |
1da177e4 | 676 | break; |
2518c7c2 | 677 | } |
1da177e4 | 678 | } |
2518c7c2 | 679 | if (!found) |
1da177e4 LT |
680 | return idx; |
681 | } | |
682 | } | |
683 | ||
2518c7c2 DM |
684 | static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2) |
685 | { | |
686 | u32 *p1 = (u32 *) s1; | |
687 | u32 *p2 = (u32 *) s2; | |
688 | int len = sizeof(struct xfrm_selector) / sizeof(u32); | |
689 | int i; | |
690 | ||
691 | for (i = 0; i < len; i++) { | |
692 | if (p1[i] != p2[i]) | |
693 | return 1; | |
694 | } | |
695 | ||
696 | return 0; | |
697 | } | |
698 | ||
a0073fe1 SK |
699 | static void xfrm_policy_requeue(struct xfrm_policy *old, |
700 | struct xfrm_policy *new) | |
701 | { | |
702 | struct xfrm_policy_queue *pq = &old->polq; | |
703 | struct sk_buff_head list; | |
704 | ||
de2ad486 LR |
705 | if (skb_queue_empty(&pq->hold_queue)) |
706 | return; | |
707 | ||
a0073fe1 SK |
708 | __skb_queue_head_init(&list); |
709 | ||
710 | spin_lock_bh(&pq->hold_queue.lock); | |
711 | skb_queue_splice_init(&pq->hold_queue, &list); | |
e7d8f6cb SK |
712 | if (del_timer(&pq->hold_timer)) |
713 | xfrm_pol_put(old); | |
a0073fe1 SK |
714 | spin_unlock_bh(&pq->hold_queue.lock); |
715 | ||
a0073fe1 SK |
716 | pq = &new->polq; |
717 | ||
718 | spin_lock_bh(&pq->hold_queue.lock); | |
719 | skb_queue_splice(&list, &pq->hold_queue); | |
720 | pq->timeout = XFRM_QUEUE_TMO_MIN; | |
e7d8f6cb SK |
721 | if (!mod_timer(&pq->hold_timer, jiffies)) |
722 | xfrm_pol_hold(new); | |
a0073fe1 SK |
723 | spin_unlock_bh(&pq->hold_queue.lock); |
724 | } | |
725 | ||
7cb8a939 SK |
726 | static bool xfrm_policy_mark_match(struct xfrm_policy *policy, |
727 | struct xfrm_policy *pol) | |
728 | { | |
729 | u32 mark = policy->mark.v & policy->mark.m; | |
730 | ||
731 | if (policy->mark.v == pol->mark.v && policy->mark.m == pol->mark.m) | |
732 | return true; | |
733 | ||
734 | if ((mark & pol->mark.m) == pol->mark.v && | |
735 | policy->priority == pol->priority) | |
736 | return true; | |
737 | ||
738 | return false; | |
739 | } | |
740 | ||
1da177e4 LT |
741 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) |
742 | { | |
1121994c | 743 | struct net *net = xp_net(policy); |
2518c7c2 DM |
744 | struct xfrm_policy *pol; |
745 | struct xfrm_policy *delpol; | |
746 | struct hlist_head *chain; | |
b67bfe0d | 747 | struct hlist_node *newpos; |
1da177e4 | 748 | |
283bc9f3 | 749 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
1121994c | 750 | chain = policy_hash_bysel(net, &policy->selector, policy->family, dir); |
2518c7c2 DM |
751 | delpol = NULL; |
752 | newpos = NULL; | |
b67bfe0d | 753 | hlist_for_each_entry(pol, chain, bydst) { |
a6c7ab55 | 754 | if (pol->type == policy->type && |
2518c7c2 | 755 | !selector_cmp(&pol->selector, &policy->selector) && |
7cb8a939 | 756 | xfrm_policy_mark_match(policy, pol) && |
a6c7ab55 HX |
757 | xfrm_sec_ctx_match(pol->security, policy->security) && |
758 | !WARN_ON(delpol)) { | |
1da177e4 | 759 | if (excl) { |
283bc9f3 | 760 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 LT |
761 | return -EEXIST; |
762 | } | |
1da177e4 LT |
763 | delpol = pol; |
764 | if (policy->priority > pol->priority) | |
765 | continue; | |
766 | } else if (policy->priority >= pol->priority) { | |
a6c7ab55 | 767 | newpos = &pol->bydst; |
1da177e4 LT |
768 | continue; |
769 | } | |
1da177e4 LT |
770 | if (delpol) |
771 | break; | |
1da177e4 LT |
772 | } |
773 | if (newpos) | |
1d023284 | 774 | hlist_add_behind(&policy->bydst, newpos); |
2518c7c2 DM |
775 | else |
776 | hlist_add_head(&policy->bydst, chain); | |
12bfa8bd | 777 | __xfrm_policy_link(policy, dir); |
ca925cf1 | 778 | atomic_inc(&net->xfrm.flow_cache_genid); |
ca4c3fc2 | 779 | |
780 | /* After previous checking, family can either be AF_INET or AF_INET6 */ | |
781 | if (policy->family == AF_INET) | |
782 | rt_genid_bump_ipv4(net); | |
783 | else | |
784 | rt_genid_bump_ipv6(net); | |
785 | ||
a0073fe1 SK |
786 | if (delpol) { |
787 | xfrm_policy_requeue(delpol, policy); | |
29fa0b30 | 788 | __xfrm_policy_unlink(delpol, dir); |
a0073fe1 | 789 | } |
e682adf0 | 790 | policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir, policy->index); |
1121994c | 791 | hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index)); |
9d729f72 | 792 | policy->curlft.add_time = get_seconds(); |
1da177e4 LT |
793 | policy->curlft.use_time = 0; |
794 | if (!mod_timer(&policy->timer, jiffies + HZ)) | |
795 | xfrm_pol_hold(policy); | |
283bc9f3 | 796 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 | 797 | |
9b78a82c | 798 | if (delpol) |
1da177e4 | 799 | xfrm_policy_kill(delpol); |
1121994c AD |
800 | else if (xfrm_bydst_should_resize(net, dir, NULL)) |
801 | schedule_work(&net->xfrm.policy_hash_work); | |
9b78a82c | 802 | |
1da177e4 LT |
803 | return 0; |
804 | } | |
805 | EXPORT_SYMBOL(xfrm_policy_insert); | |
806 | ||
8ca2e93b JHS |
807 | struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type, |
808 | int dir, struct xfrm_selector *sel, | |
ef41aaa0 EP |
809 | struct xfrm_sec_ctx *ctx, int delete, |
810 | int *err) | |
1da177e4 | 811 | { |
2518c7c2 DM |
812 | struct xfrm_policy *pol, *ret; |
813 | struct hlist_head *chain; | |
1da177e4 | 814 | |
ef41aaa0 | 815 | *err = 0; |
283bc9f3 | 816 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
8d1211a6 | 817 | chain = policy_hash_bysel(net, sel, sel->family, dir); |
2518c7c2 | 818 | ret = NULL; |
b67bfe0d | 819 | hlist_for_each_entry(pol, chain, bydst) { |
2518c7c2 | 820 | if (pol->type == type && |
34f8d884 | 821 | (mark & pol->mark.m) == pol->mark.v && |
2518c7c2 DM |
822 | !selector_cmp(sel, &pol->selector) && |
823 | xfrm_sec_ctx_match(ctx, pol->security)) { | |
1da177e4 | 824 | xfrm_pol_hold(pol); |
2518c7c2 | 825 | if (delete) { |
03e1ad7b PM |
826 | *err = security_xfrm_policy_delete( |
827 | pol->security); | |
ef41aaa0 | 828 | if (*err) { |
283bc9f3 | 829 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
ef41aaa0 EP |
830 | return pol; |
831 | } | |
29fa0b30 | 832 | __xfrm_policy_unlink(pol, dir); |
2518c7c2 DM |
833 | } |
834 | ret = pol; | |
1da177e4 LT |
835 | break; |
836 | } | |
837 | } | |
283bc9f3 | 838 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 | 839 | |
fe1a5f03 | 840 | if (ret && delete) |
2518c7c2 | 841 | xfrm_policy_kill(ret); |
2518c7c2 | 842 | return ret; |
1da177e4 | 843 | } |
df71837d | 844 | EXPORT_SYMBOL(xfrm_policy_bysel_ctx); |
1da177e4 | 845 | |
8ca2e93b JHS |
846 | struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type, |
847 | int dir, u32 id, int delete, int *err) | |
1da177e4 | 848 | { |
2518c7c2 DM |
849 | struct xfrm_policy *pol, *ret; |
850 | struct hlist_head *chain; | |
1da177e4 | 851 | |
b5505c6e HX |
852 | *err = -ENOENT; |
853 | if (xfrm_policy_id2dir(id) != dir) | |
854 | return NULL; | |
855 | ||
ef41aaa0 | 856 | *err = 0; |
283bc9f3 | 857 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
8d1211a6 | 858 | chain = net->xfrm.policy_byidx + idx_hash(net, id); |
2518c7c2 | 859 | ret = NULL; |
b67bfe0d | 860 | hlist_for_each_entry(pol, chain, byidx) { |
34f8d884 JHS |
861 | if (pol->type == type && pol->index == id && |
862 | (mark & pol->mark.m) == pol->mark.v) { | |
1da177e4 | 863 | xfrm_pol_hold(pol); |
2518c7c2 | 864 | if (delete) { |
03e1ad7b PM |
865 | *err = security_xfrm_policy_delete( |
866 | pol->security); | |
ef41aaa0 | 867 | if (*err) { |
283bc9f3 | 868 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
ef41aaa0 EP |
869 | return pol; |
870 | } | |
29fa0b30 | 871 | __xfrm_policy_unlink(pol, dir); |
2518c7c2 DM |
872 | } |
873 | ret = pol; | |
1da177e4 LT |
874 | break; |
875 | } | |
876 | } | |
283bc9f3 | 877 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 | 878 | |
fe1a5f03 | 879 | if (ret && delete) |
2518c7c2 | 880 | xfrm_policy_kill(ret); |
2518c7c2 | 881 | return ret; |
1da177e4 LT |
882 | } |
883 | EXPORT_SYMBOL(xfrm_policy_byid); | |
884 | ||
4aa2e62c JL |
885 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
886 | static inline int | |
2e71029e | 887 | xfrm_policy_flush_secctx_check(struct net *net, u8 type, bool task_valid) |
1da177e4 | 888 | { |
4aa2e62c JL |
889 | int dir, err = 0; |
890 | ||
891 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { | |
892 | struct xfrm_policy *pol; | |
4aa2e62c JL |
893 | int i; |
894 | ||
b67bfe0d | 895 | hlist_for_each_entry(pol, |
33ffbbd5 | 896 | &net->xfrm.policy_inexact[dir], bydst) { |
4aa2e62c JL |
897 | if (pol->type != type) |
898 | continue; | |
03e1ad7b | 899 | err = security_xfrm_policy_delete(pol->security); |
4aa2e62c | 900 | if (err) { |
2e71029e | 901 | xfrm_audit_policy_delete(pol, 0, task_valid); |
4aa2e62c JL |
902 | return err; |
903 | } | |
7dc12d6d | 904 | } |
33ffbbd5 | 905 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { |
b67bfe0d | 906 | hlist_for_each_entry(pol, |
33ffbbd5 | 907 | net->xfrm.policy_bydst[dir].table + i, |
4aa2e62c JL |
908 | bydst) { |
909 | if (pol->type != type) | |
910 | continue; | |
03e1ad7b PM |
911 | err = security_xfrm_policy_delete( |
912 | pol->security); | |
4aa2e62c | 913 | if (err) { |
ab5f5e8b | 914 | xfrm_audit_policy_delete(pol, 0, |
2e71029e | 915 | task_valid); |
4aa2e62c JL |
916 | return err; |
917 | } | |
918 | } | |
919 | } | |
920 | } | |
921 | return err; | |
922 | } | |
923 | #else | |
924 | static inline int | |
2e71029e | 925 | xfrm_policy_flush_secctx_check(struct net *net, u8 type, bool task_valid) |
4aa2e62c JL |
926 | { |
927 | return 0; | |
928 | } | |
929 | #endif | |
930 | ||
2e71029e | 931 | int xfrm_policy_flush(struct net *net, u8 type, bool task_valid) |
4aa2e62c | 932 | { |
2f1eb65f | 933 | int dir, err = 0, cnt = 0; |
1da177e4 | 934 | |
283bc9f3 | 935 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
4aa2e62c | 936 | |
2e71029e | 937 | err = xfrm_policy_flush_secctx_check(net, type, task_valid); |
4aa2e62c JL |
938 | if (err) |
939 | goto out; | |
940 | ||
1da177e4 | 941 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
2518c7c2 | 942 | struct xfrm_policy *pol; |
29fa0b30 | 943 | int i; |
2518c7c2 DM |
944 | |
945 | again1: | |
b67bfe0d | 946 | hlist_for_each_entry(pol, |
33ffbbd5 | 947 | &net->xfrm.policy_inexact[dir], bydst) { |
2518c7c2 DM |
948 | if (pol->type != type) |
949 | continue; | |
ea2dea9d | 950 | __xfrm_policy_unlink(pol, dir); |
283bc9f3 | 951 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
ea2dea9d | 952 | cnt++; |
1da177e4 | 953 | |
2e71029e | 954 | xfrm_audit_policy_delete(pol, 1, task_valid); |
161a09e7 | 955 | |
2518c7c2 | 956 | xfrm_policy_kill(pol); |
1da177e4 | 957 | |
283bc9f3 | 958 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
2518c7c2 DM |
959 | goto again1; |
960 | } | |
961 | ||
33ffbbd5 | 962 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { |
2518c7c2 | 963 | again2: |
b67bfe0d | 964 | hlist_for_each_entry(pol, |
33ffbbd5 | 965 | net->xfrm.policy_bydst[dir].table + i, |
2518c7c2 DM |
966 | bydst) { |
967 | if (pol->type != type) | |
968 | continue; | |
ea2dea9d | 969 | __xfrm_policy_unlink(pol, dir); |
283bc9f3 | 970 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
ea2dea9d | 971 | cnt++; |
2518c7c2 | 972 | |
2e71029e | 973 | xfrm_audit_policy_delete(pol, 1, task_valid); |
2518c7c2 DM |
974 | xfrm_policy_kill(pol); |
975 | ||
283bc9f3 | 976 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
2518c7c2 DM |
977 | goto again2; |
978 | } | |
1da177e4 | 979 | } |
2518c7c2 | 980 | |
1da177e4 | 981 | } |
2f1eb65f JHS |
982 | if (!cnt) |
983 | err = -ESRCH; | |
4aa2e62c | 984 | out: |
283bc9f3 | 985 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
4aa2e62c | 986 | return err; |
1da177e4 LT |
987 | } |
988 | EXPORT_SYMBOL(xfrm_policy_flush); | |
989 | ||
cdcbca7c | 990 | int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, |
4c563f76 | 991 | int (*func)(struct xfrm_policy *, int, int, void*), |
1da177e4 LT |
992 | void *data) |
993 | { | |
12a169e7 HX |
994 | struct xfrm_policy *pol; |
995 | struct xfrm_policy_walk_entry *x; | |
4c563f76 TT |
996 | int error = 0; |
997 | ||
998 | if (walk->type >= XFRM_POLICY_TYPE_MAX && | |
999 | walk->type != XFRM_POLICY_TYPE_ANY) | |
1000 | return -EINVAL; | |
1da177e4 | 1001 | |
12a169e7 | 1002 | if (list_empty(&walk->walk.all) && walk->seq != 0) |
4c563f76 TT |
1003 | return 0; |
1004 | ||
283bc9f3 | 1005 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
12a169e7 | 1006 | if (list_empty(&walk->walk.all)) |
cdcbca7c | 1007 | x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all); |
12a169e7 | 1008 | else |
80077702 LR |
1009 | x = list_first_entry(&walk->walk.all, |
1010 | struct xfrm_policy_walk_entry, all); | |
1011 | ||
cdcbca7c | 1012 | list_for_each_entry_from(x, &net->xfrm.policy_all, all) { |
12a169e7 | 1013 | if (x->dead) |
4c563f76 | 1014 | continue; |
12a169e7 HX |
1015 | pol = container_of(x, struct xfrm_policy, walk); |
1016 | if (walk->type != XFRM_POLICY_TYPE_ANY && | |
1017 | walk->type != pol->type) | |
1018 | continue; | |
1019 | error = func(pol, xfrm_policy_id2dir(pol->index), | |
1020 | walk->seq, data); | |
1021 | if (error) { | |
1022 | list_move_tail(&walk->walk.all, &x->all); | |
1023 | goto out; | |
2518c7c2 | 1024 | } |
12a169e7 | 1025 | walk->seq++; |
1da177e4 | 1026 | } |
12a169e7 | 1027 | if (walk->seq == 0) { |
baf5d743 JHS |
1028 | error = -ENOENT; |
1029 | goto out; | |
1030 | } | |
12a169e7 | 1031 | list_del_init(&walk->walk.all); |
1da177e4 | 1032 | out: |
283bc9f3 | 1033 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 LT |
1034 | return error; |
1035 | } | |
1036 | EXPORT_SYMBOL(xfrm_policy_walk); | |
1037 | ||
12a169e7 HX |
1038 | void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type) |
1039 | { | |
1040 | INIT_LIST_HEAD(&walk->walk.all); | |
1041 | walk->walk.dead = 1; | |
1042 | walk->type = type; | |
1043 | walk->seq = 0; | |
1044 | } | |
1045 | EXPORT_SYMBOL(xfrm_policy_walk_init); | |
1046 | ||
283bc9f3 | 1047 | void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net) |
12a169e7 HX |
1048 | { |
1049 | if (list_empty(&walk->walk.all)) | |
1050 | return; | |
1051 | ||
283bc9f3 | 1052 | write_lock_bh(&net->xfrm.xfrm_policy_lock); /*FIXME where is net? */ |
12a169e7 | 1053 | list_del(&walk->walk.all); |
283bc9f3 | 1054 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
12a169e7 HX |
1055 | } |
1056 | EXPORT_SYMBOL(xfrm_policy_walk_done); | |
1057 | ||
134b0fc5 JM |
1058 | /* |
1059 | * Find policy to apply to this flow. | |
1060 | * | |
1061 | * Returns 0 if policy found, else an -errno. | |
1062 | */ | |
f299d557 DM |
1063 | static int xfrm_policy_match(const struct xfrm_policy *pol, |
1064 | const struct flowi *fl, | |
2518c7c2 | 1065 | u8 type, u16 family, int dir) |
1da177e4 | 1066 | { |
f299d557 | 1067 | const struct xfrm_selector *sel = &pol->selector; |
bc9b35ad DM |
1068 | int ret = -ESRCH; |
1069 | bool match; | |
1da177e4 | 1070 | |
2518c7c2 | 1071 | if (pol->family != family || |
1d28f42c | 1072 | (fl->flowi_mark & pol->mark.m) != pol->mark.v || |
2518c7c2 | 1073 | pol->type != type) |
134b0fc5 | 1074 | return ret; |
1da177e4 | 1075 | |
2518c7c2 | 1076 | match = xfrm_selector_match(sel, fl, family); |
134b0fc5 | 1077 | if (match) |
1d28f42c | 1078 | ret = security_xfrm_policy_lookup(pol->security, fl->flowi_secid, |
03e1ad7b | 1079 | dir); |
2518c7c2 | 1080 | |
134b0fc5 | 1081 | return ret; |
2518c7c2 | 1082 | } |
1da177e4 | 1083 | |
52479b62 | 1084 | static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type, |
062cdb43 | 1085 | const struct flowi *fl, |
2518c7c2 DM |
1086 | u16 family, u8 dir) |
1087 | { | |
134b0fc5 | 1088 | int err; |
2518c7c2 | 1089 | struct xfrm_policy *pol, *ret; |
0b597e7e | 1090 | const xfrm_address_t *daddr, *saddr; |
2518c7c2 | 1091 | struct hlist_head *chain; |
acba48e1 | 1092 | u32 priority = ~0U; |
df71837d | 1093 | |
2518c7c2 DM |
1094 | daddr = xfrm_flowi_daddr(fl, family); |
1095 | saddr = xfrm_flowi_saddr(fl, family); | |
1096 | if (unlikely(!daddr || !saddr)) | |
1097 | return NULL; | |
1098 | ||
283bc9f3 | 1099 | read_lock_bh(&net->xfrm.xfrm_policy_lock); |
52479b62 | 1100 | chain = policy_hash_direct(net, daddr, saddr, family, dir); |
2518c7c2 | 1101 | ret = NULL; |
b67bfe0d | 1102 | hlist_for_each_entry(pol, chain, bydst) { |
134b0fc5 JM |
1103 | err = xfrm_policy_match(pol, fl, type, family, dir); |
1104 | if (err) { | |
1105 | if (err == -ESRCH) | |
1106 | continue; | |
1107 | else { | |
1108 | ret = ERR_PTR(err); | |
1109 | goto fail; | |
1110 | } | |
1111 | } else { | |
2518c7c2 | 1112 | ret = pol; |
acba48e1 | 1113 | priority = ret->priority; |
2518c7c2 DM |
1114 | break; |
1115 | } | |
1116 | } | |
52479b62 | 1117 | chain = &net->xfrm.policy_inexact[dir]; |
b67bfe0d | 1118 | hlist_for_each_entry(pol, chain, bydst) { |
8faf491e LR |
1119 | if ((pol->priority >= priority) && ret) |
1120 | break; | |
1121 | ||
134b0fc5 JM |
1122 | err = xfrm_policy_match(pol, fl, type, family, dir); |
1123 | if (err) { | |
1124 | if (err == -ESRCH) | |
1125 | continue; | |
1126 | else { | |
1127 | ret = ERR_PTR(err); | |
1128 | goto fail; | |
1129 | } | |
8faf491e | 1130 | } else { |
acba48e1 DM |
1131 | ret = pol; |
1132 | break; | |
1da177e4 LT |
1133 | } |
1134 | } | |
586f2eb4 LR |
1135 | |
1136 | xfrm_pol_hold(ret); | |
134b0fc5 | 1137 | fail: |
283bc9f3 | 1138 | read_unlock_bh(&net->xfrm.xfrm_policy_lock); |
4e81bb83 | 1139 | |
2518c7c2 | 1140 | return ret; |
4e81bb83 MN |
1141 | } |
1142 | ||
80c802f3 | 1143 | static struct xfrm_policy * |
73ff93cd | 1144 | __xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir) |
80c802f3 TT |
1145 | { |
1146 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1147 | struct xfrm_policy *pol; | |
1148 | ||
1149 | pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir); | |
1150 | if (pol != NULL) | |
1151 | return pol; | |
1152 | #endif | |
1153 | return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir); | |
1154 | } | |
1155 | ||
b5fb82c4 BZ |
1156 | static int flow_to_policy_dir(int dir) |
1157 | { | |
1158 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
1159 | XFRM_POLICY_OUT == FLOW_DIR_OUT && | |
1160 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
1161 | return dir; | |
1162 | ||
1163 | switch (dir) { | |
1164 | default: | |
1165 | case FLOW_DIR_IN: | |
1166 | return XFRM_POLICY_IN; | |
1167 | case FLOW_DIR_OUT: | |
1168 | return XFRM_POLICY_OUT; | |
1169 | case FLOW_DIR_FWD: | |
1170 | return XFRM_POLICY_FWD; | |
1171 | } | |
1172 | } | |
1173 | ||
fe1a5f03 | 1174 | static struct flow_cache_object * |
dee9f4bc | 1175 | xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, |
fe1a5f03 | 1176 | u8 dir, struct flow_cache_object *old_obj, void *ctx) |
4e81bb83 MN |
1177 | { |
1178 | struct xfrm_policy *pol; | |
fe1a5f03 TT |
1179 | |
1180 | if (old_obj) | |
1181 | xfrm_pol_put(container_of(old_obj, struct xfrm_policy, flo)); | |
4e81bb83 | 1182 | |
b5fb82c4 | 1183 | pol = __xfrm_policy_lookup(net, fl, family, flow_to_policy_dir(dir)); |
80c802f3 | 1184 | if (IS_ERR_OR_NULL(pol)) |
fe1a5f03 | 1185 | return ERR_CAST(pol); |
fe1a5f03 | 1186 | |
fe1a5f03 TT |
1187 | /* Resolver returns two references: |
1188 | * one for cache and one for caller of flow_cache_lookup() */ | |
1189 | xfrm_pol_hold(pol); | |
1190 | ||
1191 | return &pol->flo; | |
1da177e4 LT |
1192 | } |
1193 | ||
df71837d TJ |
1194 | static inline int policy_to_flow_dir(int dir) |
1195 | { | |
1196 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
a716c119 YH |
1197 | XFRM_POLICY_OUT == FLOW_DIR_OUT && |
1198 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
1199 | return dir; | |
1200 | switch (dir) { | |
1201 | default: | |
1202 | case XFRM_POLICY_IN: | |
1203 | return FLOW_DIR_IN; | |
1204 | case XFRM_POLICY_OUT: | |
1205 | return FLOW_DIR_OUT; | |
1206 | case XFRM_POLICY_FWD: | |
1207 | return FLOW_DIR_FWD; | |
3ff50b79 | 1208 | } |
df71837d TJ |
1209 | } |
1210 | ||
dee9f4bc DM |
1211 | static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, |
1212 | const struct flowi *fl) | |
1da177e4 LT |
1213 | { |
1214 | struct xfrm_policy *pol; | |
283bc9f3 | 1215 | struct net *net = sock_net(sk); |
1da177e4 | 1216 | |
283bc9f3 | 1217 | read_lock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 | 1218 | if ((pol = sk->sk_policy[dir]) != NULL) { |
bc9b35ad DM |
1219 | bool match = xfrm_selector_match(&pol->selector, fl, |
1220 | sk->sk_family); | |
a716c119 | 1221 | int err = 0; |
df71837d | 1222 | |
3bccfbc7 | 1223 | if (match) { |
34f8d884 JHS |
1224 | if ((sk->sk_mark & pol->mark.m) != pol->mark.v) { |
1225 | pol = NULL; | |
1226 | goto out; | |
1227 | } | |
03e1ad7b | 1228 | err = security_xfrm_policy_lookup(pol->security, |
1d28f42c | 1229 | fl->flowi_secid, |
03e1ad7b | 1230 | policy_to_flow_dir(dir)); |
3bccfbc7 VY |
1231 | if (!err) |
1232 | xfrm_pol_hold(pol); | |
1233 | else if (err == -ESRCH) | |
1234 | pol = NULL; | |
1235 | else | |
1236 | pol = ERR_PTR(err); | |
1237 | } else | |
1da177e4 LT |
1238 | pol = NULL; |
1239 | } | |
34f8d884 | 1240 | out: |
283bc9f3 | 1241 | read_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 LT |
1242 | return pol; |
1243 | } | |
1244 | ||
1245 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) | |
1246 | { | |
98806f75 | 1247 | struct net *net = xp_net(pol); |
4e81bb83 | 1248 | |
98806f75 | 1249 | list_add(&pol->walk.all, &net->xfrm.policy_all); |
98806f75 | 1250 | net->xfrm.policy_count[dir]++; |
1da177e4 LT |
1251 | xfrm_pol_hold(pol); |
1252 | } | |
1253 | ||
1254 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, | |
1255 | int dir) | |
1256 | { | |
98806f75 AD |
1257 | struct net *net = xp_net(pol); |
1258 | ||
53c2e285 | 1259 | if (list_empty(&pol->walk.all)) |
2518c7c2 | 1260 | return NULL; |
1da177e4 | 1261 | |
53c2e285 HX |
1262 | /* Socket policies are not hashed. */ |
1263 | if (!hlist_unhashed(&pol->bydst)) { | |
1264 | hlist_del(&pol->bydst); | |
1265 | hlist_del(&pol->byidx); | |
1266 | } | |
1267 | ||
1268 | list_del_init(&pol->walk.all); | |
98806f75 | 1269 | net->xfrm.policy_count[dir]--; |
2518c7c2 DM |
1270 | |
1271 | return pol; | |
1da177e4 LT |
1272 | } |
1273 | ||
53c2e285 HX |
1274 | static void xfrm_sk_policy_link(struct xfrm_policy *pol, int dir) |
1275 | { | |
1276 | __xfrm_policy_link(pol, XFRM_POLICY_MAX + dir); | |
1277 | } | |
1278 | ||
1279 | static void xfrm_sk_policy_unlink(struct xfrm_policy *pol, int dir) | |
1280 | { | |
1281 | __xfrm_policy_unlink(pol, XFRM_POLICY_MAX + dir); | |
1282 | } | |
1283 | ||
4666faab | 1284 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir) |
1da177e4 | 1285 | { |
283bc9f3 FD |
1286 | struct net *net = xp_net(pol); |
1287 | ||
1288 | write_lock_bh(&net->xfrm.xfrm_policy_lock); | |
1da177e4 | 1289 | pol = __xfrm_policy_unlink(pol, dir); |
283bc9f3 | 1290 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 | 1291 | if (pol) { |
1da177e4 | 1292 | xfrm_policy_kill(pol); |
4666faab | 1293 | return 0; |
1da177e4 | 1294 | } |
4666faab | 1295 | return -ENOENT; |
1da177e4 | 1296 | } |
a70fcb0b | 1297 | EXPORT_SYMBOL(xfrm_policy_delete); |
1da177e4 LT |
1298 | |
1299 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) | |
1300 | { | |
1121994c | 1301 | struct net *net = xp_net(pol); |
1da177e4 LT |
1302 | struct xfrm_policy *old_pol; |
1303 | ||
4e81bb83 MN |
1304 | #ifdef CONFIG_XFRM_SUB_POLICY |
1305 | if (pol && pol->type != XFRM_POLICY_TYPE_MAIN) | |
1306 | return -EINVAL; | |
1307 | #endif | |
1308 | ||
283bc9f3 | 1309 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 LT |
1310 | old_pol = sk->sk_policy[dir]; |
1311 | sk->sk_policy[dir] = pol; | |
1312 | if (pol) { | |
9d729f72 | 1313 | pol->curlft.add_time = get_seconds(); |
e682adf0 | 1314 | pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir, 0); |
53c2e285 | 1315 | xfrm_sk_policy_link(pol, dir); |
1da177e4 | 1316 | } |
a0073fe1 SK |
1317 | if (old_pol) { |
1318 | if (pol) | |
1319 | xfrm_policy_requeue(old_pol, pol); | |
1320 | ||
ea2dea9d TT |
1321 | /* Unlinking succeeds always. This is the only function |
1322 | * allowed to delete or replace socket policy. | |
1323 | */ | |
53c2e285 | 1324 | xfrm_sk_policy_unlink(old_pol, dir); |
a0073fe1 | 1325 | } |
283bc9f3 | 1326 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 LT |
1327 | |
1328 | if (old_pol) { | |
1329 | xfrm_policy_kill(old_pol); | |
1330 | } | |
1331 | return 0; | |
1332 | } | |
1333 | ||
d3e40a9f | 1334 | static struct xfrm_policy *clone_policy(const struct xfrm_policy *old, int dir) |
1da177e4 | 1335 | { |
0331b1f3 | 1336 | struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC); |
283bc9f3 | 1337 | struct net *net = xp_net(old); |
1da177e4 LT |
1338 | |
1339 | if (newp) { | |
1340 | newp->selector = old->selector; | |
03e1ad7b PM |
1341 | if (security_xfrm_policy_clone(old->security, |
1342 | &newp->security)) { | |
df71837d TJ |
1343 | kfree(newp); |
1344 | return NULL; /* ENOMEM */ | |
1345 | } | |
1da177e4 LT |
1346 | newp->lft = old->lft; |
1347 | newp->curlft = old->curlft; | |
fb977e2c | 1348 | newp->mark = old->mark; |
1da177e4 LT |
1349 | newp->action = old->action; |
1350 | newp->flags = old->flags; | |
1351 | newp->xfrm_nr = old->xfrm_nr; | |
1352 | newp->index = old->index; | |
4e81bb83 | 1353 | newp->type = old->type; |
1da177e4 LT |
1354 | memcpy(newp->xfrm_vec, old->xfrm_vec, |
1355 | newp->xfrm_nr*sizeof(struct xfrm_tmpl)); | |
283bc9f3 | 1356 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
53c2e285 | 1357 | xfrm_sk_policy_link(newp, dir); |
283bc9f3 | 1358 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 LT |
1359 | xfrm_pol_put(newp); |
1360 | } | |
1361 | return newp; | |
1362 | } | |
1363 | ||
1364 | int __xfrm_sk_clone_policy(struct sock *sk) | |
1365 | { | |
1366 | struct xfrm_policy *p0 = sk->sk_policy[0], | |
1367 | *p1 = sk->sk_policy[1]; | |
1368 | ||
1369 | sk->sk_policy[0] = sk->sk_policy[1] = NULL; | |
1370 | if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL) | |
1371 | return -ENOMEM; | |
1372 | if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL) | |
1373 | return -ENOMEM; | |
1374 | return 0; | |
1375 | } | |
1376 | ||
a1e59abf | 1377 | static int |
42a7b32b DA |
1378 | xfrm_get_saddr(struct net *net, int oif, xfrm_address_t *local, |
1379 | xfrm_address_t *remote, unsigned short family) | |
a1e59abf PM |
1380 | { |
1381 | int err; | |
1382 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1383 | ||
1384 | if (unlikely(afinfo == NULL)) | |
1385 | return -EINVAL; | |
42a7b32b | 1386 | err = afinfo->get_saddr(net, oif, local, remote); |
a1e59abf PM |
1387 | xfrm_policy_put_afinfo(afinfo); |
1388 | return err; | |
1389 | } | |
1390 | ||
1da177e4 LT |
1391 | /* Resolve list of templates for the flow, given policy. */ |
1392 | ||
1393 | static int | |
a6c2e611 DM |
1394 | xfrm_tmpl_resolve_one(struct xfrm_policy *policy, const struct flowi *fl, |
1395 | struct xfrm_state **xfrm, unsigned short family) | |
1da177e4 | 1396 | { |
fbda33b2 | 1397 | struct net *net = xp_net(policy); |
1da177e4 LT |
1398 | int nx; |
1399 | int i, error; | |
1400 | xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); | |
1401 | xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); | |
a1e59abf | 1402 | xfrm_address_t tmp; |
1da177e4 | 1403 | |
9b7a787d | 1404 | for (nx = 0, i = 0; i < policy->xfrm_nr; i++) { |
1da177e4 LT |
1405 | struct xfrm_state *x; |
1406 | xfrm_address_t *remote = daddr; | |
1407 | xfrm_address_t *local = saddr; | |
1408 | struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; | |
1409 | ||
48b8d783 JK |
1410 | if (tmpl->mode == XFRM_MODE_TUNNEL || |
1411 | tmpl->mode == XFRM_MODE_BEET) { | |
1da177e4 LT |
1412 | remote = &tmpl->id.daddr; |
1413 | local = &tmpl->saddr; | |
8444cf71 | 1414 | if (xfrm_addr_any(local, tmpl->encap_family)) { |
42a7b32b DA |
1415 | error = xfrm_get_saddr(net, fl->flowi_oif, |
1416 | &tmp, remote, | |
1417 | tmpl->encap_family); | |
a1e59abf PM |
1418 | if (error) |
1419 | goto fail; | |
1420 | local = &tmp; | |
1421 | } | |
1da177e4 LT |
1422 | } |
1423 | ||
1424 | x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); | |
1425 | ||
1426 | if (x && x->km.state == XFRM_STATE_VALID) { | |
1427 | xfrm[nx++] = x; | |
1428 | daddr = remote; | |
1429 | saddr = local; | |
1430 | continue; | |
1431 | } | |
1432 | if (x) { | |
1433 | error = (x->km.state == XFRM_STATE_ERROR ? | |
1434 | -EINVAL : -EAGAIN); | |
1435 | xfrm_state_put(x); | |
42054569 | 1436 | } else if (error == -ESRCH) { |
a4322266 | 1437 | error = -EAGAIN; |
42054569 | 1438 | } |
1da177e4 LT |
1439 | |
1440 | if (!tmpl->optional) | |
1441 | goto fail; | |
1442 | } | |
1443 | return nx; | |
1444 | ||
1445 | fail: | |
9b7a787d | 1446 | for (nx--; nx >= 0; nx--) |
1da177e4 LT |
1447 | xfrm_state_put(xfrm[nx]); |
1448 | return error; | |
1449 | } | |
1450 | ||
4e81bb83 | 1451 | static int |
a6c2e611 DM |
1452 | xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, const struct flowi *fl, |
1453 | struct xfrm_state **xfrm, unsigned short family) | |
4e81bb83 | 1454 | { |
41a49cc3 MN |
1455 | struct xfrm_state *tp[XFRM_MAX_DEPTH]; |
1456 | struct xfrm_state **tpp = (npols > 1) ? tp : xfrm; | |
4e81bb83 MN |
1457 | int cnx = 0; |
1458 | int error; | |
1459 | int ret; | |
1460 | int i; | |
1461 | ||
1462 | for (i = 0; i < npols; i++) { | |
1463 | if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
1464 | error = -ENOBUFS; | |
1465 | goto fail; | |
1466 | } | |
41a49cc3 MN |
1467 | |
1468 | ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family); | |
4e81bb83 MN |
1469 | if (ret < 0) { |
1470 | error = ret; | |
1471 | goto fail; | |
1472 | } else | |
1473 | cnx += ret; | |
1474 | } | |
1475 | ||
41a49cc3 MN |
1476 | /* found states are sorted for outbound processing */ |
1477 | if (npols > 1) | |
1478 | xfrm_state_sort(xfrm, tpp, cnx, family); | |
1479 | ||
4e81bb83 MN |
1480 | return cnx; |
1481 | ||
1482 | fail: | |
9b7a787d | 1483 | for (cnx--; cnx >= 0; cnx--) |
41a49cc3 | 1484 | xfrm_state_put(tpp[cnx]); |
4e81bb83 MN |
1485 | return error; |
1486 | ||
1487 | } | |
1488 | ||
1da177e4 LT |
1489 | /* Check that the bundle accepts the flow and its components are |
1490 | * still valid. | |
1491 | */ | |
1492 | ||
05d84025 | 1493 | static inline int xfrm_get_tos(const struct flowi *fl, int family) |
25ee3286 HX |
1494 | { |
1495 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1496 | int tos; | |
1da177e4 | 1497 | |
25ee3286 HX |
1498 | if (!afinfo) |
1499 | return -EINVAL; | |
1500 | ||
1501 | tos = afinfo->get_tos(fl); | |
1502 | ||
1503 | xfrm_policy_put_afinfo(afinfo); | |
1504 | ||
1505 | return tos; | |
1506 | } | |
1507 | ||
80c802f3 TT |
1508 | static struct flow_cache_object *xfrm_bundle_flo_get(struct flow_cache_object *flo) |
1509 | { | |
1510 | struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); | |
1511 | struct dst_entry *dst = &xdst->u.dst; | |
1512 | ||
1513 | if (xdst->route == NULL) { | |
1514 | /* Dummy bundle - if it has xfrms we were not | |
1515 | * able to build bundle as template resolution failed. | |
1516 | * It means we need to try again resolving. */ | |
1517 | if (xdst->num_xfrms > 0) | |
1518 | return NULL; | |
a0073fe1 SK |
1519 | } else if (dst->flags & DST_XFRM_QUEUE) { |
1520 | return NULL; | |
80c802f3 TT |
1521 | } else { |
1522 | /* Real bundle */ | |
1523 | if (stale_bundle(dst)) | |
1524 | return NULL; | |
1525 | } | |
1526 | ||
1527 | dst_hold(dst); | |
1528 | return flo; | |
1529 | } | |
1530 | ||
1531 | static int xfrm_bundle_flo_check(struct flow_cache_object *flo) | |
1532 | { | |
1533 | struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); | |
1534 | struct dst_entry *dst = &xdst->u.dst; | |
1535 | ||
1536 | if (!xdst->route) | |
1537 | return 0; | |
1538 | if (stale_bundle(dst)) | |
1539 | return 0; | |
1540 | ||
1541 | return 1; | |
1542 | } | |
1543 | ||
1544 | static void xfrm_bundle_flo_delete(struct flow_cache_object *flo) | |
1545 | { | |
1546 | struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); | |
1547 | struct dst_entry *dst = &xdst->u.dst; | |
1548 | ||
1549 | dst_free(dst); | |
1550 | } | |
1551 | ||
1552 | static const struct flow_cache_ops xfrm_bundle_fc_ops = { | |
1553 | .get = xfrm_bundle_flo_get, | |
1554 | .check = xfrm_bundle_flo_check, | |
1555 | .delete = xfrm_bundle_flo_delete, | |
1556 | }; | |
1557 | ||
d7c7544c | 1558 | static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family) |
1da177e4 | 1559 | { |
1da177e4 | 1560 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
d7c7544c | 1561 | struct dst_ops *dst_ops; |
25ee3286 HX |
1562 | struct xfrm_dst *xdst; |
1563 | ||
1564 | if (!afinfo) | |
1565 | return ERR_PTR(-EINVAL); | |
1566 | ||
d7c7544c AD |
1567 | switch (family) { |
1568 | case AF_INET: | |
1569 | dst_ops = &net->xfrm.xfrm4_dst_ops; | |
1570 | break; | |
dfd56b8b | 1571 | #if IS_ENABLED(CONFIG_IPV6) |
d7c7544c AD |
1572 | case AF_INET6: |
1573 | dst_ops = &net->xfrm.xfrm6_dst_ops; | |
1574 | break; | |
1575 | #endif | |
1576 | default: | |
1577 | BUG(); | |
1578 | } | |
f5b0a874 | 1579 | xdst = dst_alloc(dst_ops, NULL, 0, DST_OBSOLETE_NONE, 0); |
25ee3286 | 1580 | |
d4cae562 | 1581 | if (likely(xdst)) { |
141e369d SK |
1582 | struct dst_entry *dst = &xdst->u.dst; |
1583 | ||
1584 | memset(dst + 1, 0, sizeof(*xdst) - sizeof(*dst)); | |
0b150932 | 1585 | xdst->flo.ops = &xfrm_bundle_fc_ops; |
9d7b0fc1 PM |
1586 | if (afinfo->init_dst) |
1587 | afinfo->init_dst(net, xdst); | |
d4cae562 | 1588 | } else |
0b150932 | 1589 | xdst = ERR_PTR(-ENOBUFS); |
80c802f3 | 1590 | |
d4cae562 MB |
1591 | xfrm_policy_put_afinfo(afinfo); |
1592 | ||
25ee3286 HX |
1593 | return xdst; |
1594 | } | |
1595 | ||
a1b05140 MN |
1596 | static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst, |
1597 | int nfheader_len) | |
1598 | { | |
1599 | struct xfrm_policy_afinfo *afinfo = | |
1600 | xfrm_policy_get_afinfo(dst->ops->family); | |
1601 | int err; | |
1602 | ||
1603 | if (!afinfo) | |
1604 | return -EINVAL; | |
1605 | ||
1606 | err = afinfo->init_path(path, dst, nfheader_len); | |
1607 | ||
1608 | xfrm_policy_put_afinfo(afinfo); | |
1609 | ||
1610 | return err; | |
1611 | } | |
1612 | ||
87c1e12b | 1613 | static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev, |
0c7b3eef | 1614 | const struct flowi *fl) |
25ee3286 HX |
1615 | { |
1616 | struct xfrm_policy_afinfo *afinfo = | |
1617 | xfrm_policy_get_afinfo(xdst->u.dst.ops->family); | |
1618 | int err; | |
1619 | ||
1620 | if (!afinfo) | |
1da177e4 | 1621 | return -EINVAL; |
25ee3286 | 1622 | |
87c1e12b | 1623 | err = afinfo->fill_dst(xdst, dev, fl); |
25ee3286 | 1624 | |
1da177e4 | 1625 | xfrm_policy_put_afinfo(afinfo); |
25ee3286 | 1626 | |
1da177e4 LT |
1627 | return err; |
1628 | } | |
1629 | ||
80c802f3 | 1630 | |
25ee3286 HX |
1631 | /* Allocate chain of dst_entry's, attach known xfrm's, calculate |
1632 | * all the metrics... Shortly, bundle a bundle. | |
1633 | */ | |
1634 | ||
1635 | static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy, | |
1636 | struct xfrm_state **xfrm, int nx, | |
98313ada | 1637 | const struct flowi *fl, |
25ee3286 HX |
1638 | struct dst_entry *dst) |
1639 | { | |
d7c7544c | 1640 | struct net *net = xp_net(policy); |
25ee3286 HX |
1641 | unsigned long now = jiffies; |
1642 | struct net_device *dev; | |
43a4dea4 | 1643 | struct xfrm_mode *inner_mode; |
25ee3286 HX |
1644 | struct dst_entry *dst_prev = NULL; |
1645 | struct dst_entry *dst0 = NULL; | |
1646 | int i = 0; | |
1647 | int err; | |
1648 | int header_len = 0; | |
a1b05140 | 1649 | int nfheader_len = 0; |
25ee3286 HX |
1650 | int trailer_len = 0; |
1651 | int tos; | |
1652 | int family = policy->selector.family; | |
9bb182a7 YH |
1653 | xfrm_address_t saddr, daddr; |
1654 | ||
1655 | xfrm_flowi_addr_get(fl, &saddr, &daddr, family); | |
25ee3286 HX |
1656 | |
1657 | tos = xfrm_get_tos(fl, family); | |
1658 | err = tos; | |
1659 | if (tos < 0) | |
1660 | goto put_states; | |
1661 | ||
1662 | dst_hold(dst); | |
1663 | ||
1664 | for (; i < nx; i++) { | |
d7c7544c | 1665 | struct xfrm_dst *xdst = xfrm_alloc_dst(net, family); |
25ee3286 HX |
1666 | struct dst_entry *dst1 = &xdst->u.dst; |
1667 | ||
1668 | err = PTR_ERR(xdst); | |
1669 | if (IS_ERR(xdst)) { | |
1670 | dst_release(dst); | |
1671 | goto put_states; | |
1672 | } | |
1673 | ||
43a4dea4 SK |
1674 | if (xfrm[i]->sel.family == AF_UNSPEC) { |
1675 | inner_mode = xfrm_ip2inner_mode(xfrm[i], | |
1676 | xfrm_af2proto(family)); | |
1677 | if (!inner_mode) { | |
1678 | err = -EAFNOSUPPORT; | |
1679 | dst_release(dst); | |
1680 | goto put_states; | |
1681 | } | |
1682 | } else | |
1683 | inner_mode = xfrm[i]->inner_mode; | |
1684 | ||
25ee3286 HX |
1685 | if (!dst_prev) |
1686 | dst0 = dst1; | |
1687 | else { | |
1688 | dst_prev->child = dst_clone(dst1); | |
1689 | dst1->flags |= DST_NOHASH; | |
1690 | } | |
1691 | ||
1692 | xdst->route = dst; | |
defb3519 | 1693 | dst_copy_metrics(dst1, dst); |
25ee3286 HX |
1694 | |
1695 | if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) { | |
1696 | family = xfrm[i]->props.family; | |
42a7b32b DA |
1697 | dst = xfrm_dst_lookup(xfrm[i], tos, fl->flowi_oif, |
1698 | &saddr, &daddr, family); | |
25ee3286 HX |
1699 | err = PTR_ERR(dst); |
1700 | if (IS_ERR(dst)) | |
1701 | goto put_states; | |
1702 | } else | |
1703 | dst_hold(dst); | |
1704 | ||
1705 | dst1->xfrm = xfrm[i]; | |
80c802f3 | 1706 | xdst->xfrm_genid = xfrm[i]->genid; |
25ee3286 | 1707 | |
f5b0a874 | 1708 | dst1->obsolete = DST_OBSOLETE_FORCE_CHK; |
25ee3286 HX |
1709 | dst1->flags |= DST_HOST; |
1710 | dst1->lastuse = now; | |
1711 | ||
1712 | dst1->input = dst_discard; | |
43a4dea4 | 1713 | dst1->output = inner_mode->afinfo->output; |
25ee3286 HX |
1714 | |
1715 | dst1->next = dst_prev; | |
1716 | dst_prev = dst1; | |
1717 | ||
1718 | header_len += xfrm[i]->props.header_len; | |
a1b05140 MN |
1719 | if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT) |
1720 | nfheader_len += xfrm[i]->props.header_len; | |
25ee3286 HX |
1721 | trailer_len += xfrm[i]->props.trailer_len; |
1722 | } | |
1723 | ||
1724 | dst_prev->child = dst; | |
1725 | dst0->path = dst; | |
1726 | ||
1727 | err = -ENODEV; | |
1728 | dev = dst->dev; | |
1729 | if (!dev) | |
1730 | goto free_dst; | |
1731 | ||
a1b05140 | 1732 | xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len); |
25ee3286 HX |
1733 | xfrm_init_pmtu(dst_prev); |
1734 | ||
1735 | for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) { | |
1736 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev; | |
1737 | ||
87c1e12b | 1738 | err = xfrm_fill_dst(xdst, dev, fl); |
25ee3286 HX |
1739 | if (err) |
1740 | goto free_dst; | |
1741 | ||
1742 | dst_prev->header_len = header_len; | |
1743 | dst_prev->trailer_len = trailer_len; | |
1744 | header_len -= xdst->u.dst.xfrm->props.header_len; | |
1745 | trailer_len -= xdst->u.dst.xfrm->props.trailer_len; | |
1746 | } | |
1747 | ||
1748 | out: | |
1749 | return dst0; | |
1750 | ||
1751 | put_states: | |
1752 | for (; i < nx; i++) | |
1753 | xfrm_state_put(xfrm[i]); | |
1754 | free_dst: | |
1755 | if (dst0) | |
1756 | dst_free(dst0); | |
1757 | dst0 = ERR_PTR(err); | |
1758 | goto out; | |
1759 | } | |
1760 | ||
da7c224b | 1761 | #ifdef CONFIG_XFRM_SUB_POLICY |
be7928d2 | 1762 | static int xfrm_dst_alloc_copy(void **target, const void *src, int size) |
157bfc25 MN |
1763 | { |
1764 | if (!*target) { | |
1765 | *target = kmalloc(size, GFP_ATOMIC); | |
1766 | if (!*target) | |
1767 | return -ENOMEM; | |
1768 | } | |
be7928d2 | 1769 | |
157bfc25 MN |
1770 | memcpy(*target, src, size); |
1771 | return 0; | |
1772 | } | |
da7c224b | 1773 | #endif |
157bfc25 | 1774 | |
be7928d2 DB |
1775 | static int xfrm_dst_update_parent(struct dst_entry *dst, |
1776 | const struct xfrm_selector *sel) | |
157bfc25 MN |
1777 | { |
1778 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1779 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1780 | return xfrm_dst_alloc_copy((void **)&(xdst->partner), | |
1781 | sel, sizeof(*sel)); | |
1782 | #else | |
1783 | return 0; | |
1784 | #endif | |
1785 | } | |
1786 | ||
be7928d2 DB |
1787 | static int xfrm_dst_update_origin(struct dst_entry *dst, |
1788 | const struct flowi *fl) | |
157bfc25 MN |
1789 | { |
1790 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1791 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1792 | return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl)); | |
1793 | #else | |
1794 | return 0; | |
1795 | #endif | |
1796 | } | |
1da177e4 | 1797 | |
73ff93cd | 1798 | static int xfrm_expand_policies(const struct flowi *fl, u16 family, |
80c802f3 TT |
1799 | struct xfrm_policy **pols, |
1800 | int *num_pols, int *num_xfrms) | |
1801 | { | |
1802 | int i; | |
1803 | ||
1804 | if (*num_pols == 0 || !pols[0]) { | |
1805 | *num_pols = 0; | |
1806 | *num_xfrms = 0; | |
1807 | return 0; | |
1808 | } | |
1809 | if (IS_ERR(pols[0])) | |
1810 | return PTR_ERR(pols[0]); | |
1811 | ||
1812 | *num_xfrms = pols[0]->xfrm_nr; | |
1813 | ||
1814 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1815 | if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW && | |
1816 | pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1817 | pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]), | |
1818 | XFRM_POLICY_TYPE_MAIN, | |
1819 | fl, family, | |
1820 | XFRM_POLICY_OUT); | |
1821 | if (pols[1]) { | |
1822 | if (IS_ERR(pols[1])) { | |
1823 | xfrm_pols_put(pols, *num_pols); | |
1824 | return PTR_ERR(pols[1]); | |
1825 | } | |
02d0892f | 1826 | (*num_pols)++; |
80c802f3 TT |
1827 | (*num_xfrms) += pols[1]->xfrm_nr; |
1828 | } | |
1829 | } | |
1830 | #endif | |
1831 | for (i = 0; i < *num_pols; i++) { | |
1832 | if (pols[i]->action != XFRM_POLICY_ALLOW) { | |
1833 | *num_xfrms = -1; | |
1834 | break; | |
1835 | } | |
1836 | } | |
1837 | ||
1838 | return 0; | |
1839 | ||
1840 | } | |
1841 | ||
1842 | static struct xfrm_dst * | |
1843 | xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols, | |
4ca2e685 | 1844 | const struct flowi *fl, u16 family, |
80c802f3 TT |
1845 | struct dst_entry *dst_orig) |
1846 | { | |
1847 | struct net *net = xp_net(pols[0]); | |
1848 | struct xfrm_state *xfrm[XFRM_MAX_DEPTH]; | |
1849 | struct dst_entry *dst; | |
1850 | struct xfrm_dst *xdst; | |
1851 | int err; | |
1852 | ||
1853 | /* Try to instantiate a bundle */ | |
1854 | err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family); | |
d809ec89 TT |
1855 | if (err <= 0) { |
1856 | if (err != 0 && err != -EAGAIN) | |
80c802f3 TT |
1857 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); |
1858 | return ERR_PTR(err); | |
1859 | } | |
1860 | ||
1861 | dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig); | |
1862 | if (IS_ERR(dst)) { | |
1863 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR); | |
1864 | return ERR_CAST(dst); | |
1865 | } | |
1866 | ||
1867 | xdst = (struct xfrm_dst *)dst; | |
1868 | xdst->num_xfrms = err; | |
1869 | if (num_pols > 1) | |
1870 | err = xfrm_dst_update_parent(dst, &pols[1]->selector); | |
1871 | else | |
1872 | err = xfrm_dst_update_origin(dst, fl); | |
1873 | if (unlikely(err)) { | |
1874 | dst_free(dst); | |
1875 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR); | |
1876 | return ERR_PTR(err); | |
1877 | } | |
1878 | ||
1879 | xdst->num_pols = num_pols; | |
3e94c2dc | 1880 | memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols); |
80c802f3 TT |
1881 | xdst->policy_genid = atomic_read(&pols[0]->genid); |
1882 | ||
1883 | return xdst; | |
1884 | } | |
1885 | ||
a0073fe1 SK |
1886 | static void xfrm_policy_queue_process(unsigned long arg) |
1887 | { | |
a0073fe1 SK |
1888 | struct sk_buff *skb; |
1889 | struct sock *sk; | |
1890 | struct dst_entry *dst; | |
a0073fe1 SK |
1891 | struct xfrm_policy *pol = (struct xfrm_policy *)arg; |
1892 | struct xfrm_policy_queue *pq = &pol->polq; | |
1893 | struct flowi fl; | |
1894 | struct sk_buff_head list; | |
1895 | ||
1896 | spin_lock(&pq->hold_queue.lock); | |
1897 | skb = skb_peek(&pq->hold_queue); | |
2bb53e25 SK |
1898 | if (!skb) { |
1899 | spin_unlock(&pq->hold_queue.lock); | |
1900 | goto out; | |
1901 | } | |
a0073fe1 SK |
1902 | dst = skb_dst(skb); |
1903 | sk = skb->sk; | |
1904 | xfrm_decode_session(skb, &fl, dst->ops->family); | |
1905 | spin_unlock(&pq->hold_queue.lock); | |
1906 | ||
1907 | dst_hold(dst->path); | |
1908 | dst = xfrm_lookup(xp_net(pol), dst->path, &fl, | |
1909 | sk, 0); | |
1910 | if (IS_ERR(dst)) | |
1911 | goto purge_queue; | |
1912 | ||
1913 | if (dst->flags & DST_XFRM_QUEUE) { | |
1914 | dst_release(dst); | |
1915 | ||
1916 | if (pq->timeout >= XFRM_QUEUE_TMO_MAX) | |
1917 | goto purge_queue; | |
1918 | ||
1919 | pq->timeout = pq->timeout << 1; | |
e7d8f6cb SK |
1920 | if (!mod_timer(&pq->hold_timer, jiffies + pq->timeout)) |
1921 | xfrm_pol_hold(pol); | |
1922 | goto out; | |
a0073fe1 SK |
1923 | } |
1924 | ||
1925 | dst_release(dst); | |
1926 | ||
1927 | __skb_queue_head_init(&list); | |
1928 | ||
1929 | spin_lock(&pq->hold_queue.lock); | |
1930 | pq->timeout = 0; | |
1931 | skb_queue_splice_init(&pq->hold_queue, &list); | |
1932 | spin_unlock(&pq->hold_queue.lock); | |
1933 | ||
1934 | while (!skb_queue_empty(&list)) { | |
1935 | skb = __skb_dequeue(&list); | |
1936 | ||
1937 | xfrm_decode_session(skb, &fl, skb_dst(skb)->ops->family); | |
1938 | dst_hold(skb_dst(skb)->path); | |
1939 | dst = xfrm_lookup(xp_net(pol), skb_dst(skb)->path, | |
1940 | &fl, skb->sk, 0); | |
1941 | if (IS_ERR(dst)) { | |
a0073fe1 SK |
1942 | kfree_skb(skb); |
1943 | continue; | |
1944 | } | |
1945 | ||
1946 | nf_reset(skb); | |
1947 | skb_dst_drop(skb); | |
1948 | skb_dst_set(skb, dst); | |
1949 | ||
5c1e9f2c | 1950 | dst_output(skb); |
a0073fe1 SK |
1951 | } |
1952 | ||
e7d8f6cb SK |
1953 | out: |
1954 | xfrm_pol_put(pol); | |
a0073fe1 SK |
1955 | return; |
1956 | ||
1957 | purge_queue: | |
1958 | pq->timeout = 0; | |
1ee5e667 | 1959 | skb_queue_purge(&pq->hold_queue); |
e7d8f6cb | 1960 | xfrm_pol_put(pol); |
a0073fe1 SK |
1961 | } |
1962 | ||
aad88724 | 1963 | static int xdst_queue_output(struct sock *sk, struct sk_buff *skb) |
a0073fe1 SK |
1964 | { |
1965 | unsigned long sched_next; | |
1966 | struct dst_entry *dst = skb_dst(skb); | |
1967 | struct xfrm_dst *xdst = (struct xfrm_dst *) dst; | |
e7d8f6cb SK |
1968 | struct xfrm_policy *pol = xdst->pols[0]; |
1969 | struct xfrm_policy_queue *pq = &pol->polq; | |
4d53eff4 | 1970 | |
39bb5e62 | 1971 | if (unlikely(skb_fclone_busy(sk, skb))) { |
4d53eff4 SK |
1972 | kfree_skb(skb); |
1973 | return 0; | |
1974 | } | |
a0073fe1 SK |
1975 | |
1976 | if (pq->hold_queue.qlen > XFRM_MAX_QUEUE_LEN) { | |
1977 | kfree_skb(skb); | |
1978 | return -EAGAIN; | |
1979 | } | |
1980 | ||
1981 | skb_dst_force(skb); | |
a0073fe1 SK |
1982 | |
1983 | spin_lock_bh(&pq->hold_queue.lock); | |
1984 | ||
1985 | if (!pq->timeout) | |
1986 | pq->timeout = XFRM_QUEUE_TMO_MIN; | |
1987 | ||
1988 | sched_next = jiffies + pq->timeout; | |
1989 | ||
1990 | if (del_timer(&pq->hold_timer)) { | |
1991 | if (time_before(pq->hold_timer.expires, sched_next)) | |
1992 | sched_next = pq->hold_timer.expires; | |
e7d8f6cb | 1993 | xfrm_pol_put(pol); |
a0073fe1 SK |
1994 | } |
1995 | ||
1996 | __skb_queue_tail(&pq->hold_queue, skb); | |
e7d8f6cb SK |
1997 | if (!mod_timer(&pq->hold_timer, sched_next)) |
1998 | xfrm_pol_hold(pol); | |
a0073fe1 SK |
1999 | |
2000 | spin_unlock_bh(&pq->hold_queue.lock); | |
2001 | ||
2002 | return 0; | |
2003 | } | |
2004 | ||
2005 | static struct xfrm_dst *xfrm_create_dummy_bundle(struct net *net, | |
b8c203b2 | 2006 | struct xfrm_flo *xflo, |
a0073fe1 SK |
2007 | const struct flowi *fl, |
2008 | int num_xfrms, | |
2009 | u16 family) | |
2010 | { | |
2011 | int err; | |
2012 | struct net_device *dev; | |
b8c203b2 | 2013 | struct dst_entry *dst; |
a0073fe1 SK |
2014 | struct dst_entry *dst1; |
2015 | struct xfrm_dst *xdst; | |
2016 | ||
2017 | xdst = xfrm_alloc_dst(net, family); | |
2018 | if (IS_ERR(xdst)) | |
2019 | return xdst; | |
2020 | ||
b8c203b2 SK |
2021 | if (!(xflo->flags & XFRM_LOOKUP_QUEUE) || |
2022 | net->xfrm.sysctl_larval_drop || | |
2023 | num_xfrms <= 0) | |
a0073fe1 SK |
2024 | return xdst; |
2025 | ||
b8c203b2 | 2026 | dst = xflo->dst_orig; |
a0073fe1 SK |
2027 | dst1 = &xdst->u.dst; |
2028 | dst_hold(dst); | |
2029 | xdst->route = dst; | |
2030 | ||
2031 | dst_copy_metrics(dst1, dst); | |
2032 | ||
2033 | dst1->obsolete = DST_OBSOLETE_FORCE_CHK; | |
2034 | dst1->flags |= DST_HOST | DST_XFRM_QUEUE; | |
2035 | dst1->lastuse = jiffies; | |
2036 | ||
2037 | dst1->input = dst_discard; | |
2038 | dst1->output = xdst_queue_output; | |
2039 | ||
2040 | dst_hold(dst); | |
2041 | dst1->child = dst; | |
2042 | dst1->path = dst; | |
2043 | ||
2044 | xfrm_init_path((struct xfrm_dst *)dst1, dst, 0); | |
2045 | ||
2046 | err = -ENODEV; | |
2047 | dev = dst->dev; | |
2048 | if (!dev) | |
2049 | goto free_dst; | |
2050 | ||
2051 | err = xfrm_fill_dst(xdst, dev, fl); | |
2052 | if (err) | |
2053 | goto free_dst; | |
2054 | ||
2055 | out: | |
2056 | return xdst; | |
2057 | ||
2058 | free_dst: | |
2059 | dst_release(dst1); | |
2060 | xdst = ERR_PTR(err); | |
2061 | goto out; | |
2062 | } | |
2063 | ||
80c802f3 | 2064 | static struct flow_cache_object * |
dee9f4bc | 2065 | xfrm_bundle_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir, |
80c802f3 TT |
2066 | struct flow_cache_object *oldflo, void *ctx) |
2067 | { | |
b8c203b2 | 2068 | struct xfrm_flo *xflo = (struct xfrm_flo *)ctx; |
80c802f3 TT |
2069 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
2070 | struct xfrm_dst *xdst, *new_xdst; | |
2071 | int num_pols = 0, num_xfrms = 0, i, err, pol_dead; | |
2072 | ||
2073 | /* Check if the policies from old bundle are usable */ | |
2074 | xdst = NULL; | |
2075 | if (oldflo) { | |
2076 | xdst = container_of(oldflo, struct xfrm_dst, flo); | |
2077 | num_pols = xdst->num_pols; | |
2078 | num_xfrms = xdst->num_xfrms; | |
2079 | pol_dead = 0; | |
2080 | for (i = 0; i < num_pols; i++) { | |
2081 | pols[i] = xdst->pols[i]; | |
2082 | pol_dead |= pols[i]->walk.dead; | |
2083 | } | |
2084 | if (pol_dead) { | |
2085 | dst_free(&xdst->u.dst); | |
2086 | xdst = NULL; | |
2087 | num_pols = 0; | |
2088 | num_xfrms = 0; | |
2089 | oldflo = NULL; | |
2090 | } | |
2091 | } | |
2092 | ||
2093 | /* Resolve policies to use if we couldn't get them from | |
2094 | * previous cache entry */ | |
2095 | if (xdst == NULL) { | |
2096 | num_pols = 1; | |
b5fb82c4 BZ |
2097 | pols[0] = __xfrm_policy_lookup(net, fl, family, |
2098 | flow_to_policy_dir(dir)); | |
80c802f3 TT |
2099 | err = xfrm_expand_policies(fl, family, pols, |
2100 | &num_pols, &num_xfrms); | |
2101 | if (err < 0) | |
2102 | goto inc_error; | |
2103 | if (num_pols == 0) | |
2104 | return NULL; | |
2105 | if (num_xfrms <= 0) | |
2106 | goto make_dummy_bundle; | |
2107 | } | |
2108 | ||
b8c203b2 SK |
2109 | new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family, |
2110 | xflo->dst_orig); | |
80c802f3 TT |
2111 | if (IS_ERR(new_xdst)) { |
2112 | err = PTR_ERR(new_xdst); | |
2113 | if (err != -EAGAIN) | |
2114 | goto error; | |
2115 | if (oldflo == NULL) | |
2116 | goto make_dummy_bundle; | |
2117 | dst_hold(&xdst->u.dst); | |
2118 | return oldflo; | |
d809ec89 TT |
2119 | } else if (new_xdst == NULL) { |
2120 | num_xfrms = 0; | |
2121 | if (oldflo == NULL) | |
2122 | goto make_dummy_bundle; | |
2123 | xdst->num_xfrms = 0; | |
2124 | dst_hold(&xdst->u.dst); | |
2125 | return oldflo; | |
80c802f3 TT |
2126 | } |
2127 | ||
2128 | /* Kill the previous bundle */ | |
2129 | if (xdst) { | |
2130 | /* The policies were stolen for newly generated bundle */ | |
2131 | xdst->num_pols = 0; | |
2132 | dst_free(&xdst->u.dst); | |
2133 | } | |
2134 | ||
2135 | /* Flow cache does not have reference, it dst_free()'s, | |
2136 | * but we do need to return one reference for original caller */ | |
2137 | dst_hold(&new_xdst->u.dst); | |
2138 | return &new_xdst->flo; | |
2139 | ||
2140 | make_dummy_bundle: | |
2141 | /* We found policies, but there's no bundles to instantiate: | |
2142 | * either because the policy blocks, has no transformations or | |
2143 | * we could not build template (no xfrm_states).*/ | |
b8c203b2 | 2144 | xdst = xfrm_create_dummy_bundle(net, xflo, fl, num_xfrms, family); |
80c802f3 TT |
2145 | if (IS_ERR(xdst)) { |
2146 | xfrm_pols_put(pols, num_pols); | |
2147 | return ERR_CAST(xdst); | |
2148 | } | |
2149 | xdst->num_pols = num_pols; | |
2150 | xdst->num_xfrms = num_xfrms; | |
3e94c2dc | 2151 | memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols); |
80c802f3 TT |
2152 | |
2153 | dst_hold(&xdst->u.dst); | |
2154 | return &xdst->flo; | |
2155 | ||
2156 | inc_error: | |
2157 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); | |
2158 | error: | |
2159 | if (xdst != NULL) | |
2160 | dst_free(&xdst->u.dst); | |
2161 | else | |
2162 | xfrm_pols_put(pols, num_pols); | |
2163 | return ERR_PTR(err); | |
2164 | } | |
1da177e4 | 2165 | |
2774c131 DM |
2166 | static struct dst_entry *make_blackhole(struct net *net, u16 family, |
2167 | struct dst_entry *dst_orig) | |
2168 | { | |
2169 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
2170 | struct dst_entry *ret; | |
2171 | ||
2172 | if (!afinfo) { | |
2173 | dst_release(dst_orig); | |
433a1954 | 2174 | return ERR_PTR(-EINVAL); |
2774c131 DM |
2175 | } else { |
2176 | ret = afinfo->blackhole_route(net, dst_orig); | |
2177 | } | |
2178 | xfrm_policy_put_afinfo(afinfo); | |
2179 | ||
2180 | return ret; | |
2181 | } | |
2182 | ||
1da177e4 LT |
2183 | /* Main function: finds/creates a bundle for given flow. |
2184 | * | |
2185 | * At the moment we eat a raw IP route. Mostly to speed up lookups | |
2186 | * on interfaces with disabled IPsec. | |
2187 | */ | |
452edd59 DM |
2188 | struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig, |
2189 | const struct flowi *fl, | |
2190 | struct sock *sk, int flags) | |
1da177e4 | 2191 | { |
4e81bb83 | 2192 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
80c802f3 TT |
2193 | struct flow_cache_object *flo; |
2194 | struct xfrm_dst *xdst; | |
452edd59 | 2195 | struct dst_entry *dst, *route; |
80c802f3 | 2196 | u16 family = dst_orig->ops->family; |
df71837d | 2197 | u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT); |
4b021628 | 2198 | int i, err, num_pols, num_xfrms = 0, drop_pols = 0; |
e0d1caa7 | 2199 | |
80c802f3 TT |
2200 | dst = NULL; |
2201 | xdst = NULL; | |
2202 | route = NULL; | |
4e81bb83 | 2203 | |
f7944fb1 | 2204 | if (sk && sk->sk_policy[XFRM_POLICY_OUT]) { |
80c802f3 TT |
2205 | num_pols = 1; |
2206 | pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl); | |
2207 | err = xfrm_expand_policies(fl, family, pols, | |
2208 | &num_pols, &num_xfrms); | |
2209 | if (err < 0) | |
75b8c133 | 2210 | goto dropdst; |
80c802f3 TT |
2211 | |
2212 | if (num_pols) { | |
2213 | if (num_xfrms <= 0) { | |
2214 | drop_pols = num_pols; | |
2215 | goto no_transform; | |
2216 | } | |
2217 | ||
2218 | xdst = xfrm_resolve_and_create_bundle( | |
2219 | pols, num_pols, fl, | |
2220 | family, dst_orig); | |
2221 | if (IS_ERR(xdst)) { | |
2222 | xfrm_pols_put(pols, num_pols); | |
2223 | err = PTR_ERR(xdst); | |
2224 | goto dropdst; | |
d809ec89 TT |
2225 | } else if (xdst == NULL) { |
2226 | num_xfrms = 0; | |
2227 | drop_pols = num_pols; | |
2228 | goto no_transform; | |
80c802f3 TT |
2229 | } |
2230 | ||
b7eea454 SK |
2231 | dst_hold(&xdst->u.dst); |
2232 | xdst->u.dst.flags |= DST_NOCACHE; | |
80c802f3 | 2233 | route = xdst->route; |
0aa64774 | 2234 | } |
3bccfbc7 | 2235 | } |
1da177e4 | 2236 | |
80c802f3 | 2237 | if (xdst == NULL) { |
b8c203b2 SK |
2238 | struct xfrm_flo xflo; |
2239 | ||
2240 | xflo.dst_orig = dst_orig; | |
2241 | xflo.flags = flags; | |
2242 | ||
1da177e4 | 2243 | /* To accelerate a bit... */ |
2518c7c2 | 2244 | if ((dst_orig->flags & DST_NOXFRM) || |
52479b62 | 2245 | !net->xfrm.policy_count[XFRM_POLICY_OUT]) |
8b7817f3 | 2246 | goto nopol; |
1da177e4 | 2247 | |
80c802f3 | 2248 | flo = flow_cache_lookup(net, fl, family, dir, |
b8c203b2 | 2249 | xfrm_bundle_lookup, &xflo); |
80c802f3 TT |
2250 | if (flo == NULL) |
2251 | goto nopol; | |
fe1a5f03 | 2252 | if (IS_ERR(flo)) { |
80c802f3 | 2253 | err = PTR_ERR(flo); |
75b8c133 | 2254 | goto dropdst; |
d66e37a9 | 2255 | } |
80c802f3 TT |
2256 | xdst = container_of(flo, struct xfrm_dst, flo); |
2257 | ||
2258 | num_pols = xdst->num_pols; | |
2259 | num_xfrms = xdst->num_xfrms; | |
3e94c2dc | 2260 | memcpy(pols, xdst->pols, sizeof(struct xfrm_policy *) * num_pols); |
80c802f3 TT |
2261 | route = xdst->route; |
2262 | } | |
2263 | ||
2264 | dst = &xdst->u.dst; | |
2265 | if (route == NULL && num_xfrms > 0) { | |
2266 | /* The only case when xfrm_bundle_lookup() returns a | |
2267 | * bundle with null route, is when the template could | |
2268 | * not be resolved. It means policies are there, but | |
2269 | * bundle could not be created, since we don't yet | |
2270 | * have the xfrm_state's. We need to wait for KM to | |
2271 | * negotiate new SA's or bail out with error.*/ | |
2272 | if (net->xfrm.sysctl_larval_drop) { | |
80c802f3 | 2273 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); |
ac37e251 W |
2274 | err = -EREMOTE; |
2275 | goto error; | |
80c802f3 | 2276 | } |
80c802f3 | 2277 | |
5b8ef341 | 2278 | err = -EAGAIN; |
80c802f3 TT |
2279 | |
2280 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); | |
2281 | goto error; | |
1da177e4 LT |
2282 | } |
2283 | ||
80c802f3 TT |
2284 | no_transform: |
2285 | if (num_pols == 0) | |
8b7817f3 | 2286 | goto nopol; |
1da177e4 | 2287 | |
80c802f3 TT |
2288 | if ((flags & XFRM_LOOKUP_ICMP) && |
2289 | !(pols[0]->flags & XFRM_POLICY_ICMP)) { | |
2290 | err = -ENOENT; | |
8b7817f3 | 2291 | goto error; |
80c802f3 | 2292 | } |
8b7817f3 | 2293 | |
80c802f3 TT |
2294 | for (i = 0; i < num_pols; i++) |
2295 | pols[i]->curlft.use_time = get_seconds(); | |
8b7817f3 | 2296 | |
80c802f3 | 2297 | if (num_xfrms < 0) { |
1da177e4 | 2298 | /* Prohibit the flow */ |
59c9940e | 2299 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK); |
e104411b PM |
2300 | err = -EPERM; |
2301 | goto error; | |
80c802f3 TT |
2302 | } else if (num_xfrms > 0) { |
2303 | /* Flow transformed */ | |
80c802f3 TT |
2304 | dst_release(dst_orig); |
2305 | } else { | |
2306 | /* Flow passes untransformed */ | |
2307 | dst_release(dst); | |
452edd59 | 2308 | dst = dst_orig; |
1da177e4 | 2309 | } |
80c802f3 TT |
2310 | ok: |
2311 | xfrm_pols_put(pols, drop_pols); | |
0c183379 G |
2312 | if (dst && dst->xfrm && |
2313 | dst->xfrm->props.mode == XFRM_MODE_TUNNEL) | |
2314 | dst->flags |= DST_XFRM_TUNNEL; | |
452edd59 | 2315 | return dst; |
1da177e4 | 2316 | |
80c802f3 | 2317 | nopol: |
452edd59 DM |
2318 | if (!(flags & XFRM_LOOKUP_ICMP)) { |
2319 | dst = dst_orig; | |
80c802f3 | 2320 | goto ok; |
452edd59 | 2321 | } |
80c802f3 | 2322 | err = -ENOENT; |
1da177e4 | 2323 | error: |
80c802f3 | 2324 | dst_release(dst); |
75b8c133 | 2325 | dropdst: |
ac37e251 W |
2326 | if (!(flags & XFRM_LOOKUP_KEEP_DST_REF)) |
2327 | dst_release(dst_orig); | |
80c802f3 | 2328 | xfrm_pols_put(pols, drop_pols); |
452edd59 | 2329 | return ERR_PTR(err); |
1da177e4 LT |
2330 | } |
2331 | EXPORT_SYMBOL(xfrm_lookup); | |
2332 | ||
f92ee619 SK |
2333 | /* Callers of xfrm_lookup_route() must ensure a call to dst_output(). |
2334 | * Otherwise we may send out blackholed packets. | |
2335 | */ | |
2336 | struct dst_entry *xfrm_lookup_route(struct net *net, struct dst_entry *dst_orig, | |
2337 | const struct flowi *fl, | |
2338 | struct sock *sk, int flags) | |
2339 | { | |
b8c203b2 | 2340 | struct dst_entry *dst = xfrm_lookup(net, dst_orig, fl, sk, |
ac37e251 W |
2341 | flags | XFRM_LOOKUP_QUEUE | |
2342 | XFRM_LOOKUP_KEEP_DST_REF); | |
f92ee619 SK |
2343 | |
2344 | if (IS_ERR(dst) && PTR_ERR(dst) == -EREMOTE) | |
2345 | return make_blackhole(net, dst_orig->ops->family, dst_orig); | |
2346 | ||
2347 | return dst; | |
2348 | } | |
2349 | EXPORT_SYMBOL(xfrm_lookup_route); | |
2350 | ||
df0ba92a | 2351 | static inline int |
8f029de2 | 2352 | xfrm_secpath_reject(int idx, struct sk_buff *skb, const struct flowi *fl) |
df0ba92a MN |
2353 | { |
2354 | struct xfrm_state *x; | |
df0ba92a MN |
2355 | |
2356 | if (!skb->sp || idx < 0 || idx >= skb->sp->len) | |
2357 | return 0; | |
2358 | x = skb->sp->xvec[idx]; | |
2359 | if (!x->type->reject) | |
2360 | return 0; | |
1ecafede | 2361 | return x->type->reject(x, skb, fl); |
df0ba92a MN |
2362 | } |
2363 | ||
1da177e4 LT |
2364 | /* When skb is transformed back to its "native" form, we have to |
2365 | * check policy restrictions. At the moment we make this in maximally | |
2366 | * stupid way. Shame on me. :-) Of course, connected sockets must | |
2367 | * have policy cached at them. | |
2368 | */ | |
2369 | ||
2370 | static inline int | |
7db454b9 | 2371 | xfrm_state_ok(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, |
1da177e4 LT |
2372 | unsigned short family) |
2373 | { | |
2374 | if (xfrm_state_kern(x)) | |
928ba416 | 2375 | return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family); |
1da177e4 LT |
2376 | return x->id.proto == tmpl->id.proto && |
2377 | (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && | |
2378 | (x->props.reqid == tmpl->reqid || !tmpl->reqid) && | |
2379 | x->props.mode == tmpl->mode && | |
c5d18e98 | 2380 | (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) || |
f3bd4840 | 2381 | !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) && |
7e49e6de MN |
2382 | !(x->props.mode != XFRM_MODE_TRANSPORT && |
2383 | xfrm_state_addr_cmp(tmpl, x, family)); | |
1da177e4 LT |
2384 | } |
2385 | ||
df0ba92a MN |
2386 | /* |
2387 | * 0 or more than 0 is returned when validation is succeeded (either bypass | |
2388 | * because of optional transport mode, or next index of the mathced secpath | |
2389 | * state with the template. | |
2390 | * -1 is returned when no matching template is found. | |
2391 | * Otherwise "-2 - errored_index" is returned. | |
2392 | */ | |
1da177e4 | 2393 | static inline int |
22cccb7e | 2394 | xfrm_policy_ok(const struct xfrm_tmpl *tmpl, const struct sec_path *sp, int start, |
1da177e4 LT |
2395 | unsigned short family) |
2396 | { | |
2397 | int idx = start; | |
2398 | ||
2399 | if (tmpl->optional) { | |
7e49e6de | 2400 | if (tmpl->mode == XFRM_MODE_TRANSPORT) |
1da177e4 LT |
2401 | return start; |
2402 | } else | |
2403 | start = -1; | |
2404 | for (; idx < sp->len; idx++) { | |
dbe5b4aa | 2405 | if (xfrm_state_ok(tmpl, sp->xvec[idx], family)) |
1da177e4 | 2406 | return ++idx; |
df0ba92a MN |
2407 | if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) { |
2408 | if (start == -1) | |
2409 | start = -2-idx; | |
1da177e4 | 2410 | break; |
df0ba92a | 2411 | } |
1da177e4 LT |
2412 | } |
2413 | return start; | |
2414 | } | |
2415 | ||
d5422efe HX |
2416 | int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, |
2417 | unsigned int family, int reverse) | |
1da177e4 LT |
2418 | { |
2419 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
e0d1caa7 | 2420 | int err; |
1da177e4 LT |
2421 | |
2422 | if (unlikely(afinfo == NULL)) | |
2423 | return -EAFNOSUPPORT; | |
2424 | ||
d5422efe | 2425 | afinfo->decode_session(skb, fl, reverse); |
1d28f42c | 2426 | err = security_xfrm_decode_session(skb, &fl->flowi_secid); |
1da177e4 | 2427 | xfrm_policy_put_afinfo(afinfo); |
e0d1caa7 | 2428 | return err; |
1da177e4 | 2429 | } |
d5422efe | 2430 | EXPORT_SYMBOL(__xfrm_decode_session); |
1da177e4 | 2431 | |
9a7386ec | 2432 | static inline int secpath_has_nontransport(const struct sec_path *sp, int k, int *idxp) |
1da177e4 LT |
2433 | { |
2434 | for (; k < sp->len; k++) { | |
df0ba92a | 2435 | if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) { |
d1d9facf | 2436 | *idxp = k; |
1da177e4 | 2437 | return 1; |
df0ba92a | 2438 | } |
1da177e4 LT |
2439 | } |
2440 | ||
2441 | return 0; | |
2442 | } | |
2443 | ||
a716c119 | 2444 | int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, |
1da177e4 LT |
2445 | unsigned short family) |
2446 | { | |
f6e1e25d | 2447 | struct net *net = dev_net(skb->dev); |
1da177e4 | 2448 | struct xfrm_policy *pol; |
4e81bb83 MN |
2449 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
2450 | int npols = 0; | |
2451 | int xfrm_nr; | |
2452 | int pi; | |
d5422efe | 2453 | int reverse; |
1da177e4 | 2454 | struct flowi fl; |
d5422efe | 2455 | u8 fl_dir; |
df0ba92a | 2456 | int xerr_idx = -1; |
1da177e4 | 2457 | |
d5422efe HX |
2458 | reverse = dir & ~XFRM_POLICY_MASK; |
2459 | dir &= XFRM_POLICY_MASK; | |
2460 | fl_dir = policy_to_flow_dir(dir); | |
2461 | ||
0aa64774 | 2462 | if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) { |
59c9940e | 2463 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); |
1da177e4 | 2464 | return 0; |
0aa64774 MN |
2465 | } |
2466 | ||
eb9c7ebe | 2467 | nf_nat_decode_session(skb, &fl, family); |
1da177e4 LT |
2468 | |
2469 | /* First, check used SA against their selectors. */ | |
2470 | if (skb->sp) { | |
2471 | int i; | |
2472 | ||
9b7a787d | 2473 | for (i = skb->sp->len-1; i >= 0; i--) { |
dbe5b4aa | 2474 | struct xfrm_state *x = skb->sp->xvec[i]; |
0aa64774 | 2475 | if (!xfrm_selector_match(&x->sel, &fl, family)) { |
59c9940e | 2476 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH); |
1da177e4 | 2477 | return 0; |
0aa64774 | 2478 | } |
1da177e4 LT |
2479 | } |
2480 | } | |
2481 | ||
2482 | pol = NULL; | |
3bccfbc7 | 2483 | if (sk && sk->sk_policy[dir]) { |
e0d1caa7 | 2484 | pol = xfrm_sk_policy_lookup(sk, dir, &fl); |
0aa64774 | 2485 | if (IS_ERR(pol)) { |
59c9940e | 2486 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
3bccfbc7 | 2487 | return 0; |
0aa64774 | 2488 | } |
3bccfbc7 | 2489 | } |
1da177e4 | 2490 | |
fe1a5f03 TT |
2491 | if (!pol) { |
2492 | struct flow_cache_object *flo; | |
2493 | ||
2494 | flo = flow_cache_lookup(net, &fl, family, fl_dir, | |
2495 | xfrm_policy_lookup, NULL); | |
2496 | if (IS_ERR_OR_NULL(flo)) | |
2497 | pol = ERR_CAST(flo); | |
2498 | else | |
2499 | pol = container_of(flo, struct xfrm_policy, flo); | |
2500 | } | |
1da177e4 | 2501 | |
0aa64774 | 2502 | if (IS_ERR(pol)) { |
59c9940e | 2503 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
134b0fc5 | 2504 | return 0; |
0aa64774 | 2505 | } |
134b0fc5 | 2506 | |
df0ba92a | 2507 | if (!pol) { |
d1d9facf | 2508 | if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) { |
df0ba92a | 2509 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
59c9940e | 2510 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS); |
df0ba92a MN |
2511 | return 0; |
2512 | } | |
2513 | return 1; | |
2514 | } | |
1da177e4 | 2515 | |
9d729f72 | 2516 | pol->curlft.use_time = get_seconds(); |
1da177e4 | 2517 | |
4e81bb83 | 2518 | pols[0] = pol; |
02d0892f | 2519 | npols++; |
4e81bb83 MN |
2520 | #ifdef CONFIG_XFRM_SUB_POLICY |
2521 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
f6e1e25d | 2522 | pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, |
4e81bb83 MN |
2523 | &fl, family, |
2524 | XFRM_POLICY_IN); | |
2525 | if (pols[1]) { | |
0aa64774 | 2526 | if (IS_ERR(pols[1])) { |
59c9940e | 2527 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
134b0fc5 | 2528 | return 0; |
0aa64774 | 2529 | } |
9d729f72 | 2530 | pols[1]->curlft.use_time = get_seconds(); |
02d0892f | 2531 | npols++; |
4e81bb83 MN |
2532 | } |
2533 | } | |
2534 | #endif | |
2535 | ||
1da177e4 LT |
2536 | if (pol->action == XFRM_POLICY_ALLOW) { |
2537 | struct sec_path *sp; | |
2538 | static struct sec_path dummy; | |
4e81bb83 | 2539 | struct xfrm_tmpl *tp[XFRM_MAX_DEPTH]; |
41a49cc3 | 2540 | struct xfrm_tmpl *stp[XFRM_MAX_DEPTH]; |
4e81bb83 MN |
2541 | struct xfrm_tmpl **tpp = tp; |
2542 | int ti = 0; | |
1da177e4 LT |
2543 | int i, k; |
2544 | ||
2545 | if ((sp = skb->sp) == NULL) | |
2546 | sp = &dummy; | |
2547 | ||
4e81bb83 MN |
2548 | for (pi = 0; pi < npols; pi++) { |
2549 | if (pols[pi] != pol && | |
0aa64774 | 2550 | pols[pi]->action != XFRM_POLICY_ALLOW) { |
59c9940e | 2551 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); |
4e81bb83 | 2552 | goto reject; |
0aa64774 MN |
2553 | } |
2554 | if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
59c9940e | 2555 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); |
4e81bb83 | 2556 | goto reject_error; |
0aa64774 | 2557 | } |
4e81bb83 MN |
2558 | for (i = 0; i < pols[pi]->xfrm_nr; i++) |
2559 | tpp[ti++] = &pols[pi]->xfrm_vec[i]; | |
2560 | } | |
2561 | xfrm_nr = ti; | |
41a49cc3 | 2562 | if (npols > 1) { |
283bc9f3 | 2563 | xfrm_tmpl_sort(stp, tpp, xfrm_nr, family, net); |
41a49cc3 MN |
2564 | tpp = stp; |
2565 | } | |
4e81bb83 | 2566 | |
1da177e4 LT |
2567 | /* For each tunnel xfrm, find the first matching tmpl. |
2568 | * For each tmpl before that, find corresponding xfrm. | |
2569 | * Order is _important_. Later we will implement | |
2570 | * some barriers, but at the moment barriers | |
2571 | * are implied between each two transformations. | |
2572 | */ | |
4e81bb83 MN |
2573 | for (i = xfrm_nr-1, k = 0; i >= 0; i--) { |
2574 | k = xfrm_policy_ok(tpp[i], sp, k, family); | |
df0ba92a | 2575 | if (k < 0) { |
d1d9facf JM |
2576 | if (k < -1) |
2577 | /* "-2 - errored_index" returned */ | |
2578 | xerr_idx = -(2+k); | |
59c9940e | 2579 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 2580 | goto reject; |
df0ba92a | 2581 | } |
1da177e4 LT |
2582 | } |
2583 | ||
0aa64774 | 2584 | if (secpath_has_nontransport(sp, k, &xerr_idx)) { |
59c9940e | 2585 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 2586 | goto reject; |
0aa64774 | 2587 | } |
1da177e4 | 2588 | |
4e81bb83 | 2589 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
2590 | return 1; |
2591 | } | |
59c9940e | 2592 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); |
1da177e4 LT |
2593 | |
2594 | reject: | |
df0ba92a | 2595 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
4e81bb83 MN |
2596 | reject_error: |
2597 | xfrm_pols_put(pols, npols); | |
1da177e4 LT |
2598 | return 0; |
2599 | } | |
2600 | EXPORT_SYMBOL(__xfrm_policy_check); | |
2601 | ||
2602 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
2603 | { | |
99a66657 | 2604 | struct net *net = dev_net(skb->dev); |
1da177e4 | 2605 | struct flowi fl; |
adf30907 | 2606 | struct dst_entry *dst; |
73137147 | 2607 | int res = 1; |
1da177e4 | 2608 | |
0aa64774 | 2609 | if (xfrm_decode_session(skb, &fl, family) < 0) { |
72032fdb | 2610 | XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR); |
1da177e4 | 2611 | return 0; |
0aa64774 | 2612 | } |
1da177e4 | 2613 | |
fafeeb6c | 2614 | skb_dst_force(skb); |
adf30907 | 2615 | |
b8c203b2 | 2616 | dst = xfrm_lookup(net, skb_dst(skb), &fl, NULL, XFRM_LOOKUP_QUEUE); |
452edd59 | 2617 | if (IS_ERR(dst)) { |
73137147 | 2618 | res = 0; |
452edd59 DM |
2619 | dst = NULL; |
2620 | } | |
adf30907 ED |
2621 | skb_dst_set(skb, dst); |
2622 | return res; | |
1da177e4 LT |
2623 | } |
2624 | EXPORT_SYMBOL(__xfrm_route_forward); | |
2625 | ||
d49c73c7 DM |
2626 | /* Optimize later using cookies and generation ids. */ |
2627 | ||
1da177e4 LT |
2628 | static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) |
2629 | { | |
d49c73c7 | 2630 | /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete |
f5b0a874 DM |
2631 | * to DST_OBSOLETE_FORCE_CHK to force all XFRM destinations to |
2632 | * get validated by dst_ops->check on every use. We do this | |
2633 | * because when a normal route referenced by an XFRM dst is | |
2634 | * obsoleted we do not go looking around for all parent | |
2635 | * referencing XFRM dsts so that we can invalidate them. It | |
2636 | * is just too much work. Instead we make the checks here on | |
2637 | * every use. For example: | |
d49c73c7 DM |
2638 | * |
2639 | * XFRM dst A --> IPv4 dst X | |
2640 | * | |
2641 | * X is the "xdst->route" of A (X is also the "dst->path" of A | |
2642 | * in this example). If X is marked obsolete, "A" will not | |
2643 | * notice. That's what we are validating here via the | |
2644 | * stale_bundle() check. | |
2645 | * | |
2646 | * When a policy's bundle is pruned, we dst_free() the XFRM | |
f5b0a874 DM |
2647 | * dst which causes it's ->obsolete field to be set to |
2648 | * DST_OBSOLETE_DEAD. If an XFRM dst has been pruned like | |
2649 | * this, we want to force a new route lookup. | |
399c180a | 2650 | */ |
d49c73c7 DM |
2651 | if (dst->obsolete < 0 && !stale_bundle(dst)) |
2652 | return dst; | |
2653 | ||
1da177e4 LT |
2654 | return NULL; |
2655 | } | |
2656 | ||
2657 | static int stale_bundle(struct dst_entry *dst) | |
2658 | { | |
12fdb4d3 | 2659 | return !xfrm_bundle_ok((struct xfrm_dst *)dst); |
1da177e4 LT |
2660 | } |
2661 | ||
aabc9761 | 2662 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
1da177e4 | 2663 | { |
1da177e4 | 2664 | while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { |
c346dca1 | 2665 | dst->dev = dev_net(dev)->loopback_dev; |
de3cb747 | 2666 | dev_hold(dst->dev); |
1da177e4 LT |
2667 | dev_put(dev); |
2668 | } | |
2669 | } | |
aabc9761 | 2670 | EXPORT_SYMBOL(xfrm_dst_ifdown); |
1da177e4 LT |
2671 | |
2672 | static void xfrm_link_failure(struct sk_buff *skb) | |
2673 | { | |
2674 | /* Impossible. Such dst must be popped before reaches point of failure. */ | |
1da177e4 LT |
2675 | } |
2676 | ||
2677 | static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) | |
2678 | { | |
2679 | if (dst) { | |
2680 | if (dst->obsolete) { | |
2681 | dst_release(dst); | |
2682 | dst = NULL; | |
2683 | } | |
2684 | } | |
2685 | return dst; | |
2686 | } | |
2687 | ||
e4c17216 | 2688 | void xfrm_garbage_collect(struct net *net) |
c0ed1c14 | 2689 | { |
ca925cf1 | 2690 | flow_cache_flush(net); |
c0ed1c14 | 2691 | } |
e4c17216 | 2692 | EXPORT_SYMBOL(xfrm_garbage_collect); |
c0ed1c14 SK |
2693 | |
2694 | static void xfrm_garbage_collect_deferred(struct net *net) | |
2695 | { | |
ca925cf1 | 2696 | flow_cache_flush_deferred(net); |
c0ed1c14 SK |
2697 | } |
2698 | ||
25ee3286 | 2699 | static void xfrm_init_pmtu(struct dst_entry *dst) |
1da177e4 LT |
2700 | { |
2701 | do { | |
2702 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2703 | u32 pmtu, route_mtu_cached; | |
2704 | ||
2705 | pmtu = dst_mtu(dst->child); | |
2706 | xdst->child_mtu_cached = pmtu; | |
2707 | ||
2708 | pmtu = xfrm_state_mtu(dst->xfrm, pmtu); | |
2709 | ||
2710 | route_mtu_cached = dst_mtu(xdst->route); | |
2711 | xdst->route_mtu_cached = route_mtu_cached; | |
2712 | ||
2713 | if (pmtu > route_mtu_cached) | |
2714 | pmtu = route_mtu_cached; | |
2715 | ||
defb3519 | 2716 | dst_metric_set(dst, RTAX_MTU, pmtu); |
1da177e4 LT |
2717 | } while ((dst = dst->next)); |
2718 | } | |
2719 | ||
1da177e4 LT |
2720 | /* Check that the bundle accepts the flow and its components are |
2721 | * still valid. | |
2722 | */ | |
2723 | ||
12fdb4d3 | 2724 | static int xfrm_bundle_ok(struct xfrm_dst *first) |
1da177e4 LT |
2725 | { |
2726 | struct dst_entry *dst = &first->u.dst; | |
2727 | struct xfrm_dst *last; | |
2728 | u32 mtu; | |
2729 | ||
92d63dec | 2730 | if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || |
1da177e4 LT |
2731 | (dst->dev && !netif_running(dst->dev))) |
2732 | return 0; | |
2733 | ||
a0073fe1 SK |
2734 | if (dst->flags & DST_XFRM_QUEUE) |
2735 | return 1; | |
2736 | ||
1da177e4 LT |
2737 | last = NULL; |
2738 | ||
2739 | do { | |
2740 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2741 | ||
1da177e4 LT |
2742 | if (dst->xfrm->km.state != XFRM_STATE_VALID) |
2743 | return 0; | |
80c802f3 TT |
2744 | if (xdst->xfrm_genid != dst->xfrm->genid) |
2745 | return 0; | |
b1312c89 TT |
2746 | if (xdst->num_pols > 0 && |
2747 | xdst->policy_genid != atomic_read(&xdst->pols[0]->genid)) | |
9d4a706d | 2748 | return 0; |
e53820de | 2749 | |
1da177e4 LT |
2750 | mtu = dst_mtu(dst->child); |
2751 | if (xdst->child_mtu_cached != mtu) { | |
2752 | last = xdst; | |
2753 | xdst->child_mtu_cached = mtu; | |
2754 | } | |
2755 | ||
92d63dec | 2756 | if (!dst_check(xdst->route, xdst->route_cookie)) |
1da177e4 LT |
2757 | return 0; |
2758 | mtu = dst_mtu(xdst->route); | |
2759 | if (xdst->route_mtu_cached != mtu) { | |
2760 | last = xdst; | |
2761 | xdst->route_mtu_cached = mtu; | |
2762 | } | |
2763 | ||
2764 | dst = dst->child; | |
2765 | } while (dst->xfrm); | |
2766 | ||
2767 | if (likely(!last)) | |
2768 | return 1; | |
2769 | ||
2770 | mtu = last->child_mtu_cached; | |
2771 | for (;;) { | |
2772 | dst = &last->u.dst; | |
2773 | ||
2774 | mtu = xfrm_state_mtu(dst->xfrm, mtu); | |
2775 | if (mtu > last->route_mtu_cached) | |
2776 | mtu = last->route_mtu_cached; | |
defb3519 | 2777 | dst_metric_set(dst, RTAX_MTU, mtu); |
1da177e4 LT |
2778 | |
2779 | if (last == first) | |
2780 | break; | |
2781 | ||
bd0bf076 | 2782 | last = (struct xfrm_dst *)last->u.dst.next; |
1da177e4 LT |
2783 | last->child_mtu_cached = mtu; |
2784 | } | |
2785 | ||
2786 | return 1; | |
2787 | } | |
2788 | ||
0dbaee3b DM |
2789 | static unsigned int xfrm_default_advmss(const struct dst_entry *dst) |
2790 | { | |
2791 | return dst_metric_advmss(dst->path); | |
2792 | } | |
2793 | ||
ebb762f2 | 2794 | static unsigned int xfrm_mtu(const struct dst_entry *dst) |
d33e4553 | 2795 | { |
618f9bc7 SK |
2796 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
2797 | ||
2798 | return mtu ? : dst_mtu(dst->path); | |
d33e4553 DM |
2799 | } |
2800 | ||
f894cbf8 DM |
2801 | static struct neighbour *xfrm_neigh_lookup(const struct dst_entry *dst, |
2802 | struct sk_buff *skb, | |
2803 | const void *daddr) | |
d3aaeb38 | 2804 | { |
f894cbf8 | 2805 | return dst->path->ops->neigh_lookup(dst, skb, daddr); |
d3aaeb38 DM |
2806 | } |
2807 | ||
1da177e4 LT |
2808 | int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) |
2809 | { | |
d7c7544c | 2810 | struct net *net; |
1da177e4 LT |
2811 | int err = 0; |
2812 | if (unlikely(afinfo == NULL)) | |
2813 | return -EINVAL; | |
2814 | if (unlikely(afinfo->family >= NPROTO)) | |
2815 | return -EAFNOSUPPORT; | |
ef8531b6 | 2816 | spin_lock(&xfrm_policy_afinfo_lock); |
1da177e4 | 2817 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) |
f31e8d4f | 2818 | err = -EEXIST; |
1da177e4 LT |
2819 | else { |
2820 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2821 | if (likely(dst_ops->kmem_cachep == NULL)) | |
2822 | dst_ops->kmem_cachep = xfrm_dst_cache; | |
2823 | if (likely(dst_ops->check == NULL)) | |
2824 | dst_ops->check = xfrm_dst_check; | |
0dbaee3b DM |
2825 | if (likely(dst_ops->default_advmss == NULL)) |
2826 | dst_ops->default_advmss = xfrm_default_advmss; | |
ebb762f2 SK |
2827 | if (likely(dst_ops->mtu == NULL)) |
2828 | dst_ops->mtu = xfrm_mtu; | |
1da177e4 LT |
2829 | if (likely(dst_ops->negative_advice == NULL)) |
2830 | dst_ops->negative_advice = xfrm_negative_advice; | |
2831 | if (likely(dst_ops->link_failure == NULL)) | |
2832 | dst_ops->link_failure = xfrm_link_failure; | |
d3aaeb38 DM |
2833 | if (likely(dst_ops->neigh_lookup == NULL)) |
2834 | dst_ops->neigh_lookup = xfrm_neigh_lookup; | |
1da177e4 | 2835 | if (likely(afinfo->garbage_collect == NULL)) |
c0ed1c14 | 2836 | afinfo->garbage_collect = xfrm_garbage_collect_deferred; |
418a99ac | 2837 | rcu_assign_pointer(xfrm_policy_afinfo[afinfo->family], afinfo); |
1da177e4 | 2838 | } |
ef8531b6 | 2839 | spin_unlock(&xfrm_policy_afinfo_lock); |
d7c7544c AD |
2840 | |
2841 | rtnl_lock(); | |
2842 | for_each_net(net) { | |
2843 | struct dst_ops *xfrm_dst_ops; | |
2844 | ||
2845 | switch (afinfo->family) { | |
2846 | case AF_INET: | |
2847 | xfrm_dst_ops = &net->xfrm.xfrm4_dst_ops; | |
2848 | break; | |
dfd56b8b | 2849 | #if IS_ENABLED(CONFIG_IPV6) |
d7c7544c AD |
2850 | case AF_INET6: |
2851 | xfrm_dst_ops = &net->xfrm.xfrm6_dst_ops; | |
2852 | break; | |
2853 | #endif | |
2854 | default: | |
2855 | BUG(); | |
2856 | } | |
2857 | *xfrm_dst_ops = *afinfo->dst_ops; | |
2858 | } | |
2859 | rtnl_unlock(); | |
2860 | ||
1da177e4 LT |
2861 | return err; |
2862 | } | |
2863 | EXPORT_SYMBOL(xfrm_policy_register_afinfo); | |
2864 | ||
2865 | int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2866 | { | |
2867 | int err = 0; | |
2868 | if (unlikely(afinfo == NULL)) | |
2869 | return -EINVAL; | |
2870 | if (unlikely(afinfo->family >= NPROTO)) | |
2871 | return -EAFNOSUPPORT; | |
ef8531b6 | 2872 | spin_lock(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2873 | if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { |
2874 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) | |
2875 | err = -EINVAL; | |
ef8531b6 ED |
2876 | else |
2877 | RCU_INIT_POINTER(xfrm_policy_afinfo[afinfo->family], | |
2878 | NULL); | |
2879 | } | |
2880 | spin_unlock(&xfrm_policy_afinfo_lock); | |
2881 | if (!err) { | |
2882 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2883 | ||
2884 | synchronize_rcu(); | |
2885 | ||
2886 | dst_ops->kmem_cachep = NULL; | |
2887 | dst_ops->check = NULL; | |
2888 | dst_ops->negative_advice = NULL; | |
2889 | dst_ops->link_failure = NULL; | |
2890 | afinfo->garbage_collect = NULL; | |
1da177e4 | 2891 | } |
1da177e4 LT |
2892 | return err; |
2893 | } | |
2894 | EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); | |
2895 | ||
d7c7544c AD |
2896 | static void __net_init xfrm_dst_ops_init(struct net *net) |
2897 | { | |
2898 | struct xfrm_policy_afinfo *afinfo; | |
2899 | ||
ef8531b6 ED |
2900 | rcu_read_lock(); |
2901 | afinfo = rcu_dereference(xfrm_policy_afinfo[AF_INET]); | |
d7c7544c AD |
2902 | if (afinfo) |
2903 | net->xfrm.xfrm4_dst_ops = *afinfo->dst_ops; | |
dfd56b8b | 2904 | #if IS_ENABLED(CONFIG_IPV6) |
ef8531b6 | 2905 | afinfo = rcu_dereference(xfrm_policy_afinfo[AF_INET6]); |
d7c7544c AD |
2906 | if (afinfo) |
2907 | net->xfrm.xfrm6_dst_ops = *afinfo->dst_ops; | |
2908 | #endif | |
418a99ac | 2909 | rcu_read_unlock(); |
546be240 HX |
2910 | } |
2911 | ||
1da177e4 LT |
2912 | static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) |
2913 | { | |
351638e7 | 2914 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
e9dc8653 | 2915 | |
1da177e4 LT |
2916 | switch (event) { |
2917 | case NETDEV_DOWN: | |
c0ed1c14 | 2918 | xfrm_garbage_collect(dev_net(dev)); |
1da177e4 LT |
2919 | } |
2920 | return NOTIFY_DONE; | |
2921 | } | |
2922 | ||
2923 | static struct notifier_block xfrm_dev_notifier = { | |
d5917a35 | 2924 | .notifier_call = xfrm_dev_event, |
1da177e4 LT |
2925 | }; |
2926 | ||
558f82ef | 2927 | #ifdef CONFIG_XFRM_STATISTICS |
59c9940e | 2928 | static int __net_init xfrm_statistics_init(struct net *net) |
558f82ef | 2929 | { |
c68cd1a0 | 2930 | int rv; |
698365fa WC |
2931 | net->mib.xfrm_statistics = alloc_percpu(struct linux_xfrm_mib); |
2932 | if (!net->mib.xfrm_statistics) | |
558f82ef | 2933 | return -ENOMEM; |
c68cd1a0 AD |
2934 | rv = xfrm_proc_init(net); |
2935 | if (rv < 0) | |
698365fa | 2936 | free_percpu(net->mib.xfrm_statistics); |
c68cd1a0 | 2937 | return rv; |
558f82ef | 2938 | } |
59c9940e AD |
2939 | |
2940 | static void xfrm_statistics_fini(struct net *net) | |
2941 | { | |
c68cd1a0 | 2942 | xfrm_proc_fini(net); |
698365fa | 2943 | free_percpu(net->mib.xfrm_statistics); |
59c9940e AD |
2944 | } |
2945 | #else | |
2946 | static int __net_init xfrm_statistics_init(struct net *net) | |
2947 | { | |
2948 | return 0; | |
2949 | } | |
2950 | ||
2951 | static void xfrm_statistics_fini(struct net *net) | |
2952 | { | |
2953 | } | |
558f82ef MN |
2954 | #endif |
2955 | ||
d62ddc21 | 2956 | static int __net_init xfrm_policy_init(struct net *net) |
1da177e4 | 2957 | { |
2518c7c2 DM |
2958 | unsigned int hmask, sz; |
2959 | int dir; | |
2960 | ||
d62ddc21 AD |
2961 | if (net_eq(net, &init_net)) |
2962 | xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", | |
1da177e4 | 2963 | sizeof(struct xfrm_dst), |
e5d679f3 | 2964 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
20c2df83 | 2965 | NULL); |
1da177e4 | 2966 | |
2518c7c2 DM |
2967 | hmask = 8 - 1; |
2968 | sz = (hmask+1) * sizeof(struct hlist_head); | |
2969 | ||
93b851c1 AD |
2970 | net->xfrm.policy_byidx = xfrm_hash_alloc(sz); |
2971 | if (!net->xfrm.policy_byidx) | |
2972 | goto out_byidx; | |
8100bea7 | 2973 | net->xfrm.policy_idx_hmask = hmask; |
2518c7c2 | 2974 | |
53c2e285 | 2975 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
2518c7c2 DM |
2976 | struct xfrm_policy_hash *htab; |
2977 | ||
dc2caba7 | 2978 | net->xfrm.policy_count[dir] = 0; |
53c2e285 | 2979 | net->xfrm.policy_count[XFRM_POLICY_MAX + dir] = 0; |
8b18f8ea | 2980 | INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]); |
2518c7c2 | 2981 | |
a35f6c5d | 2982 | htab = &net->xfrm.policy_bydst[dir]; |
44e36b42 | 2983 | htab->table = xfrm_hash_alloc(sz); |
2518c7c2 | 2984 | if (!htab->table) |
a35f6c5d AD |
2985 | goto out_bydst; |
2986 | htab->hmask = hmask; | |
b58555f1 CG |
2987 | htab->dbits4 = 32; |
2988 | htab->sbits4 = 32; | |
2989 | htab->dbits6 = 128; | |
2990 | htab->sbits6 = 128; | |
2518c7c2 | 2991 | } |
880a6fab CG |
2992 | net->xfrm.policy_hthresh.lbits4 = 32; |
2993 | net->xfrm.policy_hthresh.rbits4 = 32; | |
2994 | net->xfrm.policy_hthresh.lbits6 = 128; | |
2995 | net->xfrm.policy_hthresh.rbits6 = 128; | |
2996 | ||
2997 | seqlock_init(&net->xfrm.policy_hthresh.lock); | |
2518c7c2 | 2998 | |
adfcf0b2 | 2999 | INIT_LIST_HEAD(&net->xfrm.policy_all); |
66caf628 | 3000 | INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize); |
880a6fab | 3001 | INIT_WORK(&net->xfrm.policy_hthresh.work, xfrm_hash_rebuild); |
d62ddc21 AD |
3002 | if (net_eq(net, &init_net)) |
3003 | register_netdevice_notifier(&xfrm_dev_notifier); | |
3004 | return 0; | |
93b851c1 | 3005 | |
a35f6c5d AD |
3006 | out_bydst: |
3007 | for (dir--; dir >= 0; dir--) { | |
3008 | struct xfrm_policy_hash *htab; | |
3009 | ||
3010 | htab = &net->xfrm.policy_bydst[dir]; | |
3011 | xfrm_hash_free(htab->table, sz); | |
3012 | } | |
3013 | xfrm_hash_free(net->xfrm.policy_byidx, sz); | |
93b851c1 AD |
3014 | out_byidx: |
3015 | return -ENOMEM; | |
d62ddc21 AD |
3016 | } |
3017 | ||
3018 | static void xfrm_policy_fini(struct net *net) | |
3019 | { | |
93b851c1 | 3020 | unsigned int sz; |
8b18f8ea | 3021 | int dir; |
93b851c1 | 3022 | |
7c2776ee AD |
3023 | flush_work(&net->xfrm.policy_hash_work); |
3024 | #ifdef CONFIG_XFRM_SUB_POLICY | |
2e71029e | 3025 | xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, false); |
7c2776ee | 3026 | #endif |
2e71029e | 3027 | xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, false); |
7c2776ee | 3028 | |
adfcf0b2 | 3029 | WARN_ON(!list_empty(&net->xfrm.policy_all)); |
93b851c1 | 3030 | |
53c2e285 | 3031 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
a35f6c5d AD |
3032 | struct xfrm_policy_hash *htab; |
3033 | ||
8b18f8ea | 3034 | WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir])); |
a35f6c5d AD |
3035 | |
3036 | htab = &net->xfrm.policy_bydst[dir]; | |
5b653b2a | 3037 | sz = (htab->hmask + 1) * sizeof(struct hlist_head); |
a35f6c5d AD |
3038 | WARN_ON(!hlist_empty(htab->table)); |
3039 | xfrm_hash_free(htab->table, sz); | |
8b18f8ea AD |
3040 | } |
3041 | ||
8100bea7 | 3042 | sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head); |
93b851c1 AD |
3043 | WARN_ON(!hlist_empty(net->xfrm.policy_byidx)); |
3044 | xfrm_hash_free(net->xfrm.policy_byidx, sz); | |
1da177e4 LT |
3045 | } |
3046 | ||
d62ddc21 AD |
3047 | static int __net_init xfrm_net_init(struct net *net) |
3048 | { | |
3049 | int rv; | |
3050 | ||
59c9940e AD |
3051 | rv = xfrm_statistics_init(net); |
3052 | if (rv < 0) | |
3053 | goto out_statistics; | |
d62ddc21 AD |
3054 | rv = xfrm_state_init(net); |
3055 | if (rv < 0) | |
3056 | goto out_state; | |
3057 | rv = xfrm_policy_init(net); | |
3058 | if (rv < 0) | |
3059 | goto out_policy; | |
d7c7544c | 3060 | xfrm_dst_ops_init(net); |
b27aeadb AD |
3061 | rv = xfrm_sysctl_init(net); |
3062 | if (rv < 0) | |
3063 | goto out_sysctl; | |
4a93f509 SK |
3064 | rv = flow_cache_init(net); |
3065 | if (rv < 0) | |
3066 | goto out; | |
283bc9f3 FD |
3067 | |
3068 | /* Initialize the per-net locks here */ | |
3069 | spin_lock_init(&net->xfrm.xfrm_state_lock); | |
3070 | rwlock_init(&net->xfrm.xfrm_policy_lock); | |
283bc9f3 FD |
3071 | mutex_init(&net->xfrm.xfrm_cfg_mutex); |
3072 | ||
d62ddc21 AD |
3073 | return 0; |
3074 | ||
4a93f509 SK |
3075 | out: |
3076 | xfrm_sysctl_fini(net); | |
b27aeadb AD |
3077 | out_sysctl: |
3078 | xfrm_policy_fini(net); | |
d62ddc21 AD |
3079 | out_policy: |
3080 | xfrm_state_fini(net); | |
3081 | out_state: | |
59c9940e AD |
3082 | xfrm_statistics_fini(net); |
3083 | out_statistics: | |
d62ddc21 AD |
3084 | return rv; |
3085 | } | |
3086 | ||
3087 | static void __net_exit xfrm_net_exit(struct net *net) | |
3088 | { | |
4a93f509 | 3089 | flow_cache_fini(net); |
b27aeadb | 3090 | xfrm_sysctl_fini(net); |
d62ddc21 AD |
3091 | xfrm_policy_fini(net); |
3092 | xfrm_state_fini(net); | |
59c9940e | 3093 | xfrm_statistics_fini(net); |
d62ddc21 AD |
3094 | } |
3095 | ||
3096 | static struct pernet_operations __net_initdata xfrm_net_ops = { | |
3097 | .init = xfrm_net_init, | |
3098 | .exit = xfrm_net_exit, | |
3099 | }; | |
3100 | ||
1da177e4 LT |
3101 | void __init xfrm_init(void) |
3102 | { | |
d62ddc21 | 3103 | register_pernet_subsys(&xfrm_net_ops); |
1da177e4 LT |
3104 | xfrm_input_init(); |
3105 | } | |
3106 | ||
ab5f5e8b | 3107 | #ifdef CONFIG_AUDITSYSCALL |
1486cbd7 IJ |
3108 | static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp, |
3109 | struct audit_buffer *audit_buf) | |
ab5f5e8b | 3110 | { |
875179fa PM |
3111 | struct xfrm_sec_ctx *ctx = xp->security; |
3112 | struct xfrm_selector *sel = &xp->selector; | |
3113 | ||
3114 | if (ctx) | |
ab5f5e8b | 3115 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", |
875179fa | 3116 | ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); |
ab5f5e8b | 3117 | |
9b7a787d | 3118 | switch (sel->family) { |
ab5f5e8b | 3119 | case AF_INET: |
21454aaa | 3120 | audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4); |
875179fa PM |
3121 | if (sel->prefixlen_s != 32) |
3122 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
3123 | sel->prefixlen_s); | |
21454aaa | 3124 | audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4); |
875179fa PM |
3125 | if (sel->prefixlen_d != 32) |
3126 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
3127 | sel->prefixlen_d); | |
ab5f5e8b JL |
3128 | break; |
3129 | case AF_INET6: | |
5b095d98 | 3130 | audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6); |
875179fa PM |
3131 | if (sel->prefixlen_s != 128) |
3132 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
3133 | sel->prefixlen_s); | |
5b095d98 | 3134 | audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6); |
875179fa PM |
3135 | if (sel->prefixlen_d != 128) |
3136 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
3137 | sel->prefixlen_d); | |
ab5f5e8b JL |
3138 | break; |
3139 | } | |
3140 | } | |
3141 | ||
2e71029e | 3142 | void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid) |
ab5f5e8b JL |
3143 | { |
3144 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 3145 | |
afeb14b4 | 3146 | audit_buf = xfrm_audit_start("SPD-add"); |
ab5f5e8b JL |
3147 | if (audit_buf == NULL) |
3148 | return; | |
2e71029e | 3149 | xfrm_audit_helper_usrinfo(task_valid, audit_buf); |
afeb14b4 | 3150 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
3151 | xfrm_audit_common_policyinfo(xp, audit_buf); |
3152 | audit_log_end(audit_buf); | |
3153 | } | |
3154 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_add); | |
3155 | ||
68277acc | 3156 | void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, |
2e71029e | 3157 | bool task_valid) |
ab5f5e8b JL |
3158 | { |
3159 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 3160 | |
afeb14b4 | 3161 | audit_buf = xfrm_audit_start("SPD-delete"); |
ab5f5e8b JL |
3162 | if (audit_buf == NULL) |
3163 | return; | |
2e71029e | 3164 | xfrm_audit_helper_usrinfo(task_valid, audit_buf); |
afeb14b4 | 3165 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
3166 | xfrm_audit_common_policyinfo(xp, audit_buf); |
3167 | audit_log_end(audit_buf); | |
3168 | } | |
3169 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete); | |
3170 | #endif | |
3171 | ||
80c9abaa | 3172 | #ifdef CONFIG_XFRM_MIGRATE |
bc9b35ad DM |
3173 | static bool xfrm_migrate_selector_match(const struct xfrm_selector *sel_cmp, |
3174 | const struct xfrm_selector *sel_tgt) | |
80c9abaa SS |
3175 | { |
3176 | if (sel_cmp->proto == IPSEC_ULPROTO_ANY) { | |
3177 | if (sel_tgt->family == sel_cmp->family && | |
70e94e66 YH |
3178 | xfrm_addr_equal(&sel_tgt->daddr, &sel_cmp->daddr, |
3179 | sel_cmp->family) && | |
3180 | xfrm_addr_equal(&sel_tgt->saddr, &sel_cmp->saddr, | |
3181 | sel_cmp->family) && | |
80c9abaa SS |
3182 | sel_tgt->prefixlen_d == sel_cmp->prefixlen_d && |
3183 | sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) { | |
bc9b35ad | 3184 | return true; |
80c9abaa SS |
3185 | } |
3186 | } else { | |
3187 | if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) { | |
bc9b35ad | 3188 | return true; |
80c9abaa SS |
3189 | } |
3190 | } | |
bc9b35ad | 3191 | return false; |
80c9abaa SS |
3192 | } |
3193 | ||
3e94c2dc WC |
3194 | static struct xfrm_policy *xfrm_migrate_policy_find(const struct xfrm_selector *sel, |
3195 | u8 dir, u8 type, struct net *net) | |
80c9abaa SS |
3196 | { |
3197 | struct xfrm_policy *pol, *ret = NULL; | |
80c9abaa SS |
3198 | struct hlist_head *chain; |
3199 | u32 priority = ~0U; | |
3200 | ||
283bc9f3 | 3201 | read_lock_bh(&net->xfrm.xfrm_policy_lock); /*FIXME*/ |
8d549c4f | 3202 | chain = policy_hash_direct(net, &sel->daddr, &sel->saddr, sel->family, dir); |
b67bfe0d | 3203 | hlist_for_each_entry(pol, chain, bydst) { |
80c9abaa SS |
3204 | if (xfrm_migrate_selector_match(sel, &pol->selector) && |
3205 | pol->type == type) { | |
3206 | ret = pol; | |
3207 | priority = ret->priority; | |
3208 | break; | |
3209 | } | |
3210 | } | |
8d549c4f | 3211 | chain = &net->xfrm.policy_inexact[dir]; |
b67bfe0d | 3212 | hlist_for_each_entry(pol, chain, bydst) { |
8faf491e LR |
3213 | if ((pol->priority >= priority) && ret) |
3214 | break; | |
3215 | ||
80c9abaa | 3216 | if (xfrm_migrate_selector_match(sel, &pol->selector) && |
8faf491e | 3217 | pol->type == type) { |
80c9abaa SS |
3218 | ret = pol; |
3219 | break; | |
3220 | } | |
3221 | } | |
3222 | ||
586f2eb4 | 3223 | xfrm_pol_hold(ret); |
80c9abaa | 3224 | |
283bc9f3 | 3225 | read_unlock_bh(&net->xfrm.xfrm_policy_lock); |
80c9abaa SS |
3226 | |
3227 | return ret; | |
3228 | } | |
3229 | ||
dd701754 | 3230 | static int migrate_tmpl_match(const struct xfrm_migrate *m, const struct xfrm_tmpl *t) |
80c9abaa SS |
3231 | { |
3232 | int match = 0; | |
3233 | ||
3234 | if (t->mode == m->mode && t->id.proto == m->proto && | |
3235 | (m->reqid == 0 || t->reqid == m->reqid)) { | |
3236 | switch (t->mode) { | |
3237 | case XFRM_MODE_TUNNEL: | |
3238 | case XFRM_MODE_BEET: | |
70e94e66 YH |
3239 | if (xfrm_addr_equal(&t->id.daddr, &m->old_daddr, |
3240 | m->old_family) && | |
3241 | xfrm_addr_equal(&t->saddr, &m->old_saddr, | |
3242 | m->old_family)) { | |
80c9abaa SS |
3243 | match = 1; |
3244 | } | |
3245 | break; | |
3246 | case XFRM_MODE_TRANSPORT: | |
3247 | /* in case of transport mode, template does not store | |
3248 | any IP addresses, hence we just compare mode and | |
3249 | protocol */ | |
3250 | match = 1; | |
3251 | break; | |
3252 | default: | |
3253 | break; | |
3254 | } | |
3255 | } | |
3256 | return match; | |
3257 | } | |
3258 | ||
3259 | /* update endpoint address(es) of template(s) */ | |
3260 | static int xfrm_policy_migrate(struct xfrm_policy *pol, | |
3261 | struct xfrm_migrate *m, int num_migrate) | |
3262 | { | |
3263 | struct xfrm_migrate *mp; | |
80c9abaa SS |
3264 | int i, j, n = 0; |
3265 | ||
3266 | write_lock_bh(&pol->lock); | |
12a169e7 | 3267 | if (unlikely(pol->walk.dead)) { |
80c9abaa SS |
3268 | /* target policy has been deleted */ |
3269 | write_unlock_bh(&pol->lock); | |
3270 | return -ENOENT; | |
3271 | } | |
3272 | ||
3273 | for (i = 0; i < pol->xfrm_nr; i++) { | |
3274 | for (j = 0, mp = m; j < num_migrate; j++, mp++) { | |
3275 | if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i])) | |
3276 | continue; | |
3277 | n++; | |
1bfcb10f HX |
3278 | if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL && |
3279 | pol->xfrm_vec[i].mode != XFRM_MODE_BEET) | |
80c9abaa SS |
3280 | continue; |
3281 | /* update endpoints */ | |
3282 | memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr, | |
3283 | sizeof(pol->xfrm_vec[i].id.daddr)); | |
3284 | memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr, | |
3285 | sizeof(pol->xfrm_vec[i].saddr)); | |
3286 | pol->xfrm_vec[i].encap_family = mp->new_family; | |
3287 | /* flush bundles */ | |
80c802f3 | 3288 | atomic_inc(&pol->genid); |
80c9abaa SS |
3289 | } |
3290 | } | |
3291 | ||
3292 | write_unlock_bh(&pol->lock); | |
3293 | ||
3294 | if (!n) | |
3295 | return -ENODATA; | |
3296 | ||
3297 | return 0; | |
3298 | } | |
3299 | ||
dd701754 | 3300 | static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate) |
80c9abaa SS |
3301 | { |
3302 | int i, j; | |
3303 | ||
3304 | if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) | |
3305 | return -EINVAL; | |
3306 | ||
3307 | for (i = 0; i < num_migrate; i++) { | |
70e94e66 YH |
3308 | if (xfrm_addr_equal(&m[i].old_daddr, &m[i].new_daddr, |
3309 | m[i].old_family) && | |
3310 | xfrm_addr_equal(&m[i].old_saddr, &m[i].new_saddr, | |
3311 | m[i].old_family)) | |
80c9abaa SS |
3312 | return -EINVAL; |
3313 | if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) || | |
3314 | xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) | |
3315 | return -EINVAL; | |
3316 | ||
3317 | /* check if there is any duplicated entry */ | |
3318 | for (j = i + 1; j < num_migrate; j++) { | |
3319 | if (!memcmp(&m[i].old_daddr, &m[j].old_daddr, | |
3320 | sizeof(m[i].old_daddr)) && | |
3321 | !memcmp(&m[i].old_saddr, &m[j].old_saddr, | |
3322 | sizeof(m[i].old_saddr)) && | |
3323 | m[i].proto == m[j].proto && | |
3324 | m[i].mode == m[j].mode && | |
3325 | m[i].reqid == m[j].reqid && | |
3326 | m[i].old_family == m[j].old_family) | |
3327 | return -EINVAL; | |
3328 | } | |
3329 | } | |
3330 | ||
3331 | return 0; | |
3332 | } | |
3333 | ||
b4b7c0b3 | 3334 | int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, |
13c1d189 | 3335 | struct xfrm_migrate *m, int num_migrate, |
8d549c4f | 3336 | struct xfrm_kmaddress *k, struct net *net) |
80c9abaa SS |
3337 | { |
3338 | int i, err, nx_cur = 0, nx_new = 0; | |
3339 | struct xfrm_policy *pol = NULL; | |
3340 | struct xfrm_state *x, *xc; | |
3341 | struct xfrm_state *x_cur[XFRM_MAX_DEPTH]; | |
3342 | struct xfrm_state *x_new[XFRM_MAX_DEPTH]; | |
3343 | struct xfrm_migrate *mp; | |
3344 | ||
3345 | if ((err = xfrm_migrate_check(m, num_migrate)) < 0) | |
3346 | goto out; | |
3347 | ||
3348 | /* Stage 1 - find policy */ | |
8d549c4f | 3349 | if ((pol = xfrm_migrate_policy_find(sel, dir, type, net)) == NULL) { |
80c9abaa SS |
3350 | err = -ENOENT; |
3351 | goto out; | |
3352 | } | |
3353 | ||
3354 | /* Stage 2 - find and update state(s) */ | |
3355 | for (i = 0, mp = m; i < num_migrate; i++, mp++) { | |
283bc9f3 | 3356 | if ((x = xfrm_migrate_state_find(mp, net))) { |
80c9abaa SS |
3357 | x_cur[nx_cur] = x; |
3358 | nx_cur++; | |
3359 | if ((xc = xfrm_state_migrate(x, mp))) { | |
3360 | x_new[nx_new] = xc; | |
3361 | nx_new++; | |
3362 | } else { | |
3363 | err = -ENODATA; | |
3364 | goto restore_state; | |
3365 | } | |
3366 | } | |
3367 | } | |
3368 | ||
3369 | /* Stage 3 - update policy */ | |
3370 | if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0) | |
3371 | goto restore_state; | |
3372 | ||
3373 | /* Stage 4 - delete old state(s) */ | |
3374 | if (nx_cur) { | |
3375 | xfrm_states_put(x_cur, nx_cur); | |
3376 | xfrm_states_delete(x_cur, nx_cur); | |
3377 | } | |
3378 | ||
3379 | /* Stage 5 - announce */ | |
13c1d189 | 3380 | km_migrate(sel, dir, type, m, num_migrate, k); |
80c9abaa SS |
3381 | |
3382 | xfrm_pol_put(pol); | |
3383 | ||
3384 | return 0; | |
3385 | out: | |
3386 | return err; | |
3387 | ||
3388 | restore_state: | |
3389 | if (pol) | |
3390 | xfrm_pol_put(pol); | |
3391 | if (nx_cur) | |
3392 | xfrm_states_put(x_cur, nx_cur); | |
3393 | if (nx_new) | |
3394 | xfrm_states_delete(x_new, nx_new); | |
3395 | ||
3396 | return err; | |
3397 | } | |
e610e679 | 3398 | EXPORT_SYMBOL(xfrm_migrate); |
80c9abaa | 3399 | #endif |