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 | ||
c5b3cf46 | 118 | static inline struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, |
6418c4e0 DM |
119 | const xfrm_address_t *saddr, |
120 | const xfrm_address_t *daddr, | |
9bb182a7 YH |
121 | int family) |
122 | { | |
123 | struct xfrm_policy_afinfo *afinfo; | |
124 | struct dst_entry *dst; | |
125 | ||
126 | afinfo = xfrm_policy_get_afinfo(family); | |
127 | if (unlikely(afinfo == NULL)) | |
128 | return ERR_PTR(-EAFNOSUPPORT); | |
129 | ||
c5b3cf46 | 130 | dst = afinfo->dst_lookup(net, tos, saddr, daddr); |
9bb182a7 YH |
131 | |
132 | xfrm_policy_put_afinfo(afinfo); | |
133 | ||
134 | return dst; | |
135 | } | |
136 | ||
25ee3286 | 137 | static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos, |
9bb182a7 YH |
138 | xfrm_address_t *prev_saddr, |
139 | xfrm_address_t *prev_daddr, | |
25ee3286 | 140 | int family) |
1da177e4 | 141 | { |
c5b3cf46 | 142 | struct net *net = xs_net(x); |
66cdb3ca HX |
143 | xfrm_address_t *saddr = &x->props.saddr; |
144 | xfrm_address_t *daddr = &x->id.daddr; | |
66cdb3ca HX |
145 | struct dst_entry *dst; |
146 | ||
9bb182a7 | 147 | if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) { |
66cdb3ca | 148 | saddr = x->coaddr; |
9bb182a7 YH |
149 | daddr = prev_daddr; |
150 | } | |
151 | if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) { | |
152 | saddr = prev_saddr; | |
66cdb3ca | 153 | daddr = x->coaddr; |
9bb182a7 | 154 | } |
1da177e4 | 155 | |
c5b3cf46 | 156 | dst = __xfrm_dst_lookup(net, tos, saddr, daddr, family); |
9bb182a7 YH |
157 | |
158 | if (!IS_ERR(dst)) { | |
159 | if (prev_saddr != saddr) | |
160 | memcpy(prev_saddr, saddr, sizeof(*prev_saddr)); | |
161 | if (prev_daddr != daddr) | |
162 | memcpy(prev_daddr, daddr, sizeof(*prev_daddr)); | |
163 | } | |
1da177e4 | 164 | |
66cdb3ca | 165 | return dst; |
1da177e4 | 166 | } |
1da177e4 | 167 | |
1da177e4 LT |
168 | static inline unsigned long make_jiffies(long secs) |
169 | { | |
170 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
171 | return MAX_SCHEDULE_TIMEOUT-1; | |
172 | else | |
a716c119 | 173 | return secs*HZ; |
1da177e4 LT |
174 | } |
175 | ||
176 | static void xfrm_policy_timer(unsigned long data) | |
177 | { | |
3e94c2dc | 178 | struct xfrm_policy *xp = (struct xfrm_policy *)data; |
9d729f72 | 179 | unsigned long now = get_seconds(); |
1da177e4 LT |
180 | long next = LONG_MAX; |
181 | int warn = 0; | |
182 | int dir; | |
183 | ||
184 | read_lock(&xp->lock); | |
185 | ||
ea2dea9d | 186 | if (unlikely(xp->walk.dead)) |
1da177e4 LT |
187 | goto out; |
188 | ||
77d8d7a6 | 189 | dir = xfrm_policy_id2dir(xp->index); |
1da177e4 LT |
190 | |
191 | if (xp->lft.hard_add_expires_seconds) { | |
192 | long tmo = xp->lft.hard_add_expires_seconds + | |
193 | xp->curlft.add_time - now; | |
194 | if (tmo <= 0) | |
195 | goto expired; | |
196 | if (tmo < next) | |
197 | next = tmo; | |
198 | } | |
199 | if (xp->lft.hard_use_expires_seconds) { | |
200 | long tmo = xp->lft.hard_use_expires_seconds + | |
201 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
202 | if (tmo <= 0) | |
203 | goto expired; | |
204 | if (tmo < next) | |
205 | next = tmo; | |
206 | } | |
207 | if (xp->lft.soft_add_expires_seconds) { | |
208 | long tmo = xp->lft.soft_add_expires_seconds + | |
209 | xp->curlft.add_time - now; | |
210 | if (tmo <= 0) { | |
211 | warn = 1; | |
212 | tmo = XFRM_KM_TIMEOUT; | |
213 | } | |
214 | if (tmo < next) | |
215 | next = tmo; | |
216 | } | |
217 | if (xp->lft.soft_use_expires_seconds) { | |
218 | long tmo = xp->lft.soft_use_expires_seconds + | |
219 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
220 | if (tmo <= 0) { | |
221 | warn = 1; | |
222 | tmo = XFRM_KM_TIMEOUT; | |
223 | } | |
224 | if (tmo < next) | |
225 | next = tmo; | |
226 | } | |
227 | ||
228 | if (warn) | |
6c5c8ca7 | 229 | km_policy_expired(xp, dir, 0, 0); |
1da177e4 LT |
230 | if (next != LONG_MAX && |
231 | !mod_timer(&xp->timer, jiffies + make_jiffies(next))) | |
232 | xfrm_pol_hold(xp); | |
233 | ||
234 | out: | |
235 | read_unlock(&xp->lock); | |
236 | xfrm_pol_put(xp); | |
237 | return; | |
238 | ||
239 | expired: | |
240 | read_unlock(&xp->lock); | |
4666faab | 241 | if (!xfrm_policy_delete(xp, dir)) |
6c5c8ca7 | 242 | km_policy_expired(xp, dir, 1, 0); |
1da177e4 LT |
243 | xfrm_pol_put(xp); |
244 | } | |
245 | ||
fe1a5f03 TT |
246 | static struct flow_cache_object *xfrm_policy_flo_get(struct flow_cache_object *flo) |
247 | { | |
248 | struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo); | |
249 | ||
250 | if (unlikely(pol->walk.dead)) | |
251 | flo = NULL; | |
252 | else | |
253 | xfrm_pol_hold(pol); | |
254 | ||
255 | return flo; | |
256 | } | |
257 | ||
258 | static int xfrm_policy_flo_check(struct flow_cache_object *flo) | |
259 | { | |
260 | struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo); | |
261 | ||
262 | return !pol->walk.dead; | |
263 | } | |
264 | ||
265 | static void xfrm_policy_flo_delete(struct flow_cache_object *flo) | |
266 | { | |
267 | xfrm_pol_put(container_of(flo, struct xfrm_policy, flo)); | |
268 | } | |
269 | ||
270 | static const struct flow_cache_ops xfrm_policy_fc_ops = { | |
271 | .get = xfrm_policy_flo_get, | |
272 | .check = xfrm_policy_flo_check, | |
273 | .delete = xfrm_policy_flo_delete, | |
274 | }; | |
1da177e4 LT |
275 | |
276 | /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2 | |
277 | * SPD calls. | |
278 | */ | |
279 | ||
0331b1f3 | 280 | struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp) |
1da177e4 LT |
281 | { |
282 | struct xfrm_policy *policy; | |
283 | ||
0da974f4 | 284 | policy = kzalloc(sizeof(struct xfrm_policy), gfp); |
1da177e4 LT |
285 | |
286 | if (policy) { | |
0331b1f3 | 287 | write_pnet(&policy->xp_net, net); |
12a169e7 | 288 | INIT_LIST_HEAD(&policy->walk.all); |
2518c7c2 DM |
289 | INIT_HLIST_NODE(&policy->bydst); |
290 | INIT_HLIST_NODE(&policy->byidx); | |
1da177e4 | 291 | rwlock_init(&policy->lock); |
2518c7c2 | 292 | atomic_set(&policy->refcnt, 1); |
a0073fe1 | 293 | skb_queue_head_init(&policy->polq.hold_queue); |
b24b8a24 PE |
294 | setup_timer(&policy->timer, xfrm_policy_timer, |
295 | (unsigned long)policy); | |
a0073fe1 SK |
296 | setup_timer(&policy->polq.hold_timer, xfrm_policy_queue_process, |
297 | (unsigned long)policy); | |
fe1a5f03 | 298 | policy->flo.ops = &xfrm_policy_fc_ops; |
1da177e4 LT |
299 | } |
300 | return policy; | |
301 | } | |
302 | EXPORT_SYMBOL(xfrm_policy_alloc); | |
303 | ||
304 | /* Destroy xfrm_policy: descendant resources must be released to this moment. */ | |
305 | ||
64c31b3f | 306 | void xfrm_policy_destroy(struct xfrm_policy *policy) |
1da177e4 | 307 | { |
12a169e7 | 308 | BUG_ON(!policy->walk.dead); |
1da177e4 | 309 | |
0659eea9 | 310 | if (del_timer(&policy->timer) || del_timer(&policy->polq.hold_timer)) |
1da177e4 LT |
311 | BUG(); |
312 | ||
03e1ad7b | 313 | security_xfrm_policy_free(policy->security); |
1da177e4 LT |
314 | kfree(policy); |
315 | } | |
64c31b3f | 316 | EXPORT_SYMBOL(xfrm_policy_destroy); |
1da177e4 | 317 | |
a0073fe1 SK |
318 | static void xfrm_queue_purge(struct sk_buff_head *list) |
319 | { | |
320 | struct sk_buff *skb; | |
321 | ||
302a50bc | 322 | while ((skb = skb_dequeue(list)) != NULL) |
a0073fe1 | 323 | kfree_skb(skb); |
a0073fe1 SK |
324 | } |
325 | ||
1da177e4 LT |
326 | /* Rule must be locked. Release descentant resources, announce |
327 | * entry dead. The rule must be unlinked from lists to the moment. | |
328 | */ | |
329 | ||
330 | static void xfrm_policy_kill(struct xfrm_policy *policy) | |
331 | { | |
12a169e7 | 332 | policy->walk.dead = 1; |
1da177e4 | 333 | |
285ead17 | 334 | atomic_inc(&policy->genid); |
1da177e4 | 335 | |
e7d8f6cb SK |
336 | if (del_timer(&policy->polq.hold_timer)) |
337 | xfrm_pol_put(policy); | |
a0073fe1 SK |
338 | xfrm_queue_purge(&policy->polq.hold_queue); |
339 | ||
285ead17 TT |
340 | if (del_timer(&policy->timer)) |
341 | xfrm_pol_put(policy); | |
342 | ||
343 | xfrm_pol_put(policy); | |
1da177e4 LT |
344 | } |
345 | ||
2518c7c2 DM |
346 | static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024; |
347 | ||
e92303f8 | 348 | static inline unsigned int idx_hash(struct net *net, u32 index) |
2518c7c2 | 349 | { |
e92303f8 | 350 | return __idx_hash(index, net->xfrm.policy_idx_hmask); |
2518c7c2 DM |
351 | } |
352 | ||
b58555f1 CG |
353 | /* calculate policy hash thresholds */ |
354 | static void __get_hash_thresh(struct net *net, | |
355 | unsigned short family, int dir, | |
356 | u8 *dbits, u8 *sbits) | |
357 | { | |
358 | switch (family) { | |
359 | case AF_INET: | |
360 | *dbits = net->xfrm.policy_bydst[dir].dbits4; | |
361 | *sbits = net->xfrm.policy_bydst[dir].sbits4; | |
362 | break; | |
363 | ||
364 | case AF_INET6: | |
365 | *dbits = net->xfrm.policy_bydst[dir].dbits6; | |
366 | *sbits = net->xfrm.policy_bydst[dir].sbits6; | |
367 | break; | |
368 | ||
369 | default: | |
370 | *dbits = 0; | |
371 | *sbits = 0; | |
372 | } | |
373 | } | |
374 | ||
5f803b58 DM |
375 | static struct hlist_head *policy_hash_bysel(struct net *net, |
376 | const struct xfrm_selector *sel, | |
377 | unsigned short family, int dir) | |
2518c7c2 | 378 | { |
1121994c | 379 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
b58555f1 CG |
380 | unsigned int hash; |
381 | u8 dbits; | |
382 | u8 sbits; | |
383 | ||
384 | __get_hash_thresh(net, family, dir, &dbits, &sbits); | |
385 | hash = __sel_hash(sel, family, hmask, dbits, sbits); | |
2518c7c2 DM |
386 | |
387 | return (hash == hmask + 1 ? | |
1121994c AD |
388 | &net->xfrm.policy_inexact[dir] : |
389 | net->xfrm.policy_bydst[dir].table + hash); | |
2518c7c2 DM |
390 | } |
391 | ||
5f803b58 DM |
392 | static struct hlist_head *policy_hash_direct(struct net *net, |
393 | const xfrm_address_t *daddr, | |
394 | const xfrm_address_t *saddr, | |
395 | unsigned short family, int dir) | |
2518c7c2 | 396 | { |
1121994c | 397 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
b58555f1 CG |
398 | unsigned int hash; |
399 | u8 dbits; | |
400 | u8 sbits; | |
401 | ||
402 | __get_hash_thresh(net, family, dir, &dbits, &sbits); | |
403 | hash = __addr_hash(daddr, saddr, family, hmask, dbits, sbits); | |
2518c7c2 | 404 | |
1121994c | 405 | return net->xfrm.policy_bydst[dir].table + hash; |
2518c7c2 DM |
406 | } |
407 | ||
b58555f1 CG |
408 | static void xfrm_dst_hash_transfer(struct net *net, |
409 | struct hlist_head *list, | |
2518c7c2 | 410 | struct hlist_head *ndsttable, |
b58555f1 CG |
411 | unsigned int nhashmask, |
412 | int dir) | |
2518c7c2 | 413 | { |
b67bfe0d | 414 | struct hlist_node *tmp, *entry0 = NULL; |
2518c7c2 | 415 | struct xfrm_policy *pol; |
b791160b | 416 | unsigned int h0 = 0; |
b58555f1 CG |
417 | u8 dbits; |
418 | u8 sbits; | |
2518c7c2 | 419 | |
b791160b | 420 | redo: |
b67bfe0d | 421 | hlist_for_each_entry_safe(pol, tmp, list, bydst) { |
2518c7c2 DM |
422 | unsigned int h; |
423 | ||
b58555f1 | 424 | __get_hash_thresh(net, pol->family, dir, &dbits, &sbits); |
2518c7c2 | 425 | h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr, |
b58555f1 | 426 | pol->family, nhashmask, dbits, sbits); |
b791160b | 427 | if (!entry0) { |
b67bfe0d | 428 | hlist_del(&pol->bydst); |
b791160b YH |
429 | hlist_add_head(&pol->bydst, ndsttable+h); |
430 | h0 = h; | |
431 | } else { | |
432 | if (h != h0) | |
433 | continue; | |
b67bfe0d | 434 | hlist_del(&pol->bydst); |
1d023284 | 435 | hlist_add_behind(&pol->bydst, entry0); |
b791160b | 436 | } |
b67bfe0d | 437 | entry0 = &pol->bydst; |
b791160b YH |
438 | } |
439 | if (!hlist_empty(list)) { | |
440 | entry0 = NULL; | |
441 | goto redo; | |
2518c7c2 DM |
442 | } |
443 | } | |
444 | ||
445 | static void xfrm_idx_hash_transfer(struct hlist_head *list, | |
446 | struct hlist_head *nidxtable, | |
447 | unsigned int nhashmask) | |
448 | { | |
b67bfe0d | 449 | struct hlist_node *tmp; |
2518c7c2 DM |
450 | struct xfrm_policy *pol; |
451 | ||
b67bfe0d | 452 | hlist_for_each_entry_safe(pol, tmp, list, byidx) { |
2518c7c2 DM |
453 | unsigned int h; |
454 | ||
455 | h = __idx_hash(pol->index, nhashmask); | |
456 | hlist_add_head(&pol->byidx, nidxtable+h); | |
457 | } | |
458 | } | |
459 | ||
460 | static unsigned long xfrm_new_hash_mask(unsigned int old_hmask) | |
461 | { | |
462 | return ((old_hmask + 1) << 1) - 1; | |
463 | } | |
464 | ||
66caf628 | 465 | static void xfrm_bydst_resize(struct net *net, int dir) |
2518c7c2 | 466 | { |
66caf628 | 467 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
468 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
469 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
66caf628 | 470 | struct hlist_head *odst = net->xfrm.policy_bydst[dir].table; |
44e36b42 | 471 | struct hlist_head *ndst = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
472 | int i; |
473 | ||
474 | if (!ndst) | |
475 | return; | |
476 | ||
283bc9f3 | 477 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
2518c7c2 DM |
478 | |
479 | for (i = hmask; i >= 0; i--) | |
b58555f1 | 480 | xfrm_dst_hash_transfer(net, odst + i, ndst, nhashmask, dir); |
2518c7c2 | 481 | |
66caf628 AD |
482 | net->xfrm.policy_bydst[dir].table = ndst; |
483 | net->xfrm.policy_bydst[dir].hmask = nhashmask; | |
2518c7c2 | 484 | |
283bc9f3 | 485 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
2518c7c2 | 486 | |
44e36b42 | 487 | xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
488 | } |
489 | ||
66caf628 | 490 | static void xfrm_byidx_resize(struct net *net, int total) |
2518c7c2 | 491 | { |
66caf628 | 492 | unsigned int hmask = net->xfrm.policy_idx_hmask; |
2518c7c2 DM |
493 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
494 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
66caf628 | 495 | struct hlist_head *oidx = net->xfrm.policy_byidx; |
44e36b42 | 496 | struct hlist_head *nidx = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
497 | int i; |
498 | ||
499 | if (!nidx) | |
500 | return; | |
501 | ||
283bc9f3 | 502 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
2518c7c2 DM |
503 | |
504 | for (i = hmask; i >= 0; i--) | |
505 | xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask); | |
506 | ||
66caf628 AD |
507 | net->xfrm.policy_byidx = nidx; |
508 | net->xfrm.policy_idx_hmask = nhashmask; | |
2518c7c2 | 509 | |
283bc9f3 | 510 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
2518c7c2 | 511 | |
44e36b42 | 512 | xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
513 | } |
514 | ||
66caf628 | 515 | static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total) |
2518c7c2 | 516 | { |
66caf628 AD |
517 | unsigned int cnt = net->xfrm.policy_count[dir]; |
518 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; | |
2518c7c2 DM |
519 | |
520 | if (total) | |
521 | *total += cnt; | |
522 | ||
523 | if ((hmask + 1) < xfrm_policy_hashmax && | |
524 | cnt > hmask) | |
525 | return 1; | |
526 | ||
527 | return 0; | |
528 | } | |
529 | ||
66caf628 | 530 | static inline int xfrm_byidx_should_resize(struct net *net, int total) |
2518c7c2 | 531 | { |
66caf628 | 532 | unsigned int hmask = net->xfrm.policy_idx_hmask; |
2518c7c2 DM |
533 | |
534 | if ((hmask + 1) < xfrm_policy_hashmax && | |
535 | total > hmask) | |
536 | return 1; | |
537 | ||
538 | return 0; | |
539 | } | |
540 | ||
e071041b | 541 | void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si) |
ecfd6b18 | 542 | { |
283bc9f3 | 543 | read_lock_bh(&net->xfrm.xfrm_policy_lock); |
e071041b AD |
544 | si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN]; |
545 | si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT]; | |
546 | si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD]; | |
547 | si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX]; | |
548 | si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX]; | |
549 | si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX]; | |
550 | si->spdhcnt = net->xfrm.policy_idx_hmask; | |
ecfd6b18 | 551 | si->spdhmcnt = xfrm_policy_hashmax; |
283bc9f3 | 552 | read_unlock_bh(&net->xfrm.xfrm_policy_lock); |
ecfd6b18 JHS |
553 | } |
554 | EXPORT_SYMBOL(xfrm_spd_getinfo); | |
2518c7c2 | 555 | |
ecfd6b18 | 556 | static DEFINE_MUTEX(hash_resize_mutex); |
66caf628 | 557 | static void xfrm_hash_resize(struct work_struct *work) |
2518c7c2 | 558 | { |
66caf628 | 559 | struct net *net = container_of(work, struct net, xfrm.policy_hash_work); |
2518c7c2 DM |
560 | int dir, total; |
561 | ||
562 | mutex_lock(&hash_resize_mutex); | |
563 | ||
564 | total = 0; | |
53c2e285 | 565 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
66caf628 AD |
566 | if (xfrm_bydst_should_resize(net, dir, &total)) |
567 | xfrm_bydst_resize(net, dir); | |
2518c7c2 | 568 | } |
66caf628 AD |
569 | if (xfrm_byidx_should_resize(net, total)) |
570 | xfrm_byidx_resize(net, total); | |
2518c7c2 DM |
571 | |
572 | mutex_unlock(&hash_resize_mutex); | |
573 | } | |
574 | ||
880a6fab CG |
575 | static void xfrm_hash_rebuild(struct work_struct *work) |
576 | { | |
577 | struct net *net = container_of(work, struct net, | |
578 | xfrm.policy_hthresh.work); | |
579 | unsigned int hmask; | |
580 | struct xfrm_policy *pol; | |
581 | struct xfrm_policy *policy; | |
582 | struct hlist_head *chain; | |
583 | struct hlist_head *odst; | |
584 | struct hlist_node *newpos; | |
585 | int i; | |
586 | int dir; | |
587 | unsigned seq; | |
588 | u8 lbits4, rbits4, lbits6, rbits6; | |
589 | ||
590 | mutex_lock(&hash_resize_mutex); | |
591 | ||
592 | /* read selector prefixlen thresholds */ | |
593 | do { | |
594 | seq = read_seqbegin(&net->xfrm.policy_hthresh.lock); | |
595 | ||
596 | lbits4 = net->xfrm.policy_hthresh.lbits4; | |
597 | rbits4 = net->xfrm.policy_hthresh.rbits4; | |
598 | lbits6 = net->xfrm.policy_hthresh.lbits6; | |
599 | rbits6 = net->xfrm.policy_hthresh.rbits6; | |
600 | } while (read_seqretry(&net->xfrm.policy_hthresh.lock, seq)); | |
601 | ||
602 | write_lock_bh(&net->xfrm.xfrm_policy_lock); | |
603 | ||
604 | /* reset the bydst and inexact table in all directions */ | |
53c2e285 | 605 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
880a6fab CG |
606 | INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]); |
607 | hmask = net->xfrm.policy_bydst[dir].hmask; | |
608 | odst = net->xfrm.policy_bydst[dir].table; | |
609 | for (i = hmask; i >= 0; i--) | |
610 | INIT_HLIST_HEAD(odst + i); | |
611 | if ((dir & XFRM_POLICY_MASK) == XFRM_POLICY_OUT) { | |
612 | /* dir out => dst = remote, src = local */ | |
613 | net->xfrm.policy_bydst[dir].dbits4 = rbits4; | |
614 | net->xfrm.policy_bydst[dir].sbits4 = lbits4; | |
615 | net->xfrm.policy_bydst[dir].dbits6 = rbits6; | |
616 | net->xfrm.policy_bydst[dir].sbits6 = lbits6; | |
617 | } else { | |
618 | /* dir in/fwd => dst = local, src = remote */ | |
619 | net->xfrm.policy_bydst[dir].dbits4 = lbits4; | |
620 | net->xfrm.policy_bydst[dir].sbits4 = rbits4; | |
621 | net->xfrm.policy_bydst[dir].dbits6 = lbits6; | |
622 | net->xfrm.policy_bydst[dir].sbits6 = rbits6; | |
623 | } | |
624 | } | |
625 | ||
626 | /* re-insert all policies by order of creation */ | |
627 | list_for_each_entry_reverse(policy, &net->xfrm.policy_all, walk.all) { | |
628 | newpos = NULL; | |
629 | chain = policy_hash_bysel(net, &policy->selector, | |
630 | policy->family, | |
631 | xfrm_policy_id2dir(policy->index)); | |
632 | hlist_for_each_entry(pol, chain, bydst) { | |
633 | if (policy->priority >= pol->priority) | |
634 | newpos = &pol->bydst; | |
635 | else | |
636 | break; | |
637 | } | |
638 | if (newpos) | |
639 | hlist_add_behind(&policy->bydst, newpos); | |
640 | else | |
641 | hlist_add_head(&policy->bydst, chain); | |
642 | } | |
643 | ||
644 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); | |
645 | ||
646 | mutex_unlock(&hash_resize_mutex); | |
647 | } | |
648 | ||
649 | void xfrm_policy_hash_rebuild(struct net *net) | |
650 | { | |
651 | schedule_work(&net->xfrm.policy_hthresh.work); | |
652 | } | |
653 | EXPORT_SYMBOL(xfrm_policy_hash_rebuild); | |
654 | ||
1da177e4 LT |
655 | /* Generate new index... KAME seems to generate them ordered by cost |
656 | * of an absolute inpredictability of ordering of rules. This will not pass. */ | |
e682adf0 | 657 | static u32 xfrm_gen_index(struct net *net, int dir, u32 index) |
1da177e4 | 658 | { |
1da177e4 LT |
659 | static u32 idx_generator; |
660 | ||
661 | for (;;) { | |
2518c7c2 DM |
662 | struct hlist_head *list; |
663 | struct xfrm_policy *p; | |
664 | u32 idx; | |
665 | int found; | |
666 | ||
e682adf0 FD |
667 | if (!index) { |
668 | idx = (idx_generator | dir); | |
669 | idx_generator += 8; | |
670 | } else { | |
671 | idx = index; | |
672 | index = 0; | |
673 | } | |
674 | ||
1da177e4 LT |
675 | if (idx == 0) |
676 | idx = 8; | |
1121994c | 677 | list = net->xfrm.policy_byidx + idx_hash(net, idx); |
2518c7c2 | 678 | found = 0; |
b67bfe0d | 679 | hlist_for_each_entry(p, list, byidx) { |
2518c7c2 DM |
680 | if (p->index == idx) { |
681 | found = 1; | |
1da177e4 | 682 | break; |
2518c7c2 | 683 | } |
1da177e4 | 684 | } |
2518c7c2 | 685 | if (!found) |
1da177e4 LT |
686 | return idx; |
687 | } | |
688 | } | |
689 | ||
2518c7c2 DM |
690 | static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2) |
691 | { | |
692 | u32 *p1 = (u32 *) s1; | |
693 | u32 *p2 = (u32 *) s2; | |
694 | int len = sizeof(struct xfrm_selector) / sizeof(u32); | |
695 | int i; | |
696 | ||
697 | for (i = 0; i < len; i++) { | |
698 | if (p1[i] != p2[i]) | |
699 | return 1; | |
700 | } | |
701 | ||
702 | return 0; | |
703 | } | |
704 | ||
a0073fe1 SK |
705 | static void xfrm_policy_requeue(struct xfrm_policy *old, |
706 | struct xfrm_policy *new) | |
707 | { | |
708 | struct xfrm_policy_queue *pq = &old->polq; | |
709 | struct sk_buff_head list; | |
710 | ||
711 | __skb_queue_head_init(&list); | |
712 | ||
713 | spin_lock_bh(&pq->hold_queue.lock); | |
714 | skb_queue_splice_init(&pq->hold_queue, &list); | |
e7d8f6cb SK |
715 | if (del_timer(&pq->hold_timer)) |
716 | xfrm_pol_put(old); | |
a0073fe1 SK |
717 | spin_unlock_bh(&pq->hold_queue.lock); |
718 | ||
719 | if (skb_queue_empty(&list)) | |
720 | return; | |
721 | ||
722 | pq = &new->polq; | |
723 | ||
724 | spin_lock_bh(&pq->hold_queue.lock); | |
725 | skb_queue_splice(&list, &pq->hold_queue); | |
726 | pq->timeout = XFRM_QUEUE_TMO_MIN; | |
e7d8f6cb SK |
727 | if (!mod_timer(&pq->hold_timer, jiffies)) |
728 | xfrm_pol_hold(new); | |
a0073fe1 SK |
729 | spin_unlock_bh(&pq->hold_queue.lock); |
730 | } | |
731 | ||
7cb8a939 SK |
732 | static bool xfrm_policy_mark_match(struct xfrm_policy *policy, |
733 | struct xfrm_policy *pol) | |
734 | { | |
735 | u32 mark = policy->mark.v & policy->mark.m; | |
736 | ||
737 | if (policy->mark.v == pol->mark.v && policy->mark.m == pol->mark.m) | |
738 | return true; | |
739 | ||
740 | if ((mark & pol->mark.m) == pol->mark.v && | |
741 | policy->priority == pol->priority) | |
742 | return true; | |
743 | ||
744 | return false; | |
745 | } | |
746 | ||
1da177e4 LT |
747 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) |
748 | { | |
1121994c | 749 | struct net *net = xp_net(policy); |
2518c7c2 DM |
750 | struct xfrm_policy *pol; |
751 | struct xfrm_policy *delpol; | |
752 | struct hlist_head *chain; | |
b67bfe0d | 753 | struct hlist_node *newpos; |
1da177e4 | 754 | |
283bc9f3 | 755 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
1121994c | 756 | chain = policy_hash_bysel(net, &policy->selector, policy->family, dir); |
2518c7c2 DM |
757 | delpol = NULL; |
758 | newpos = NULL; | |
b67bfe0d | 759 | hlist_for_each_entry(pol, chain, bydst) { |
a6c7ab55 | 760 | if (pol->type == policy->type && |
2518c7c2 | 761 | !selector_cmp(&pol->selector, &policy->selector) && |
7cb8a939 | 762 | xfrm_policy_mark_match(policy, pol) && |
a6c7ab55 HX |
763 | xfrm_sec_ctx_match(pol->security, policy->security) && |
764 | !WARN_ON(delpol)) { | |
1da177e4 | 765 | if (excl) { |
283bc9f3 | 766 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 LT |
767 | return -EEXIST; |
768 | } | |
1da177e4 LT |
769 | delpol = pol; |
770 | if (policy->priority > pol->priority) | |
771 | continue; | |
772 | } else if (policy->priority >= pol->priority) { | |
a6c7ab55 | 773 | newpos = &pol->bydst; |
1da177e4 LT |
774 | continue; |
775 | } | |
1da177e4 LT |
776 | if (delpol) |
777 | break; | |
1da177e4 LT |
778 | } |
779 | if (newpos) | |
1d023284 | 780 | hlist_add_behind(&policy->bydst, newpos); |
2518c7c2 DM |
781 | else |
782 | hlist_add_head(&policy->bydst, chain); | |
12bfa8bd | 783 | __xfrm_policy_link(policy, dir); |
ca925cf1 | 784 | atomic_inc(&net->xfrm.flow_cache_genid); |
ca4c3fc2 | 785 | |
786 | /* After previous checking, family can either be AF_INET or AF_INET6 */ | |
787 | if (policy->family == AF_INET) | |
788 | rt_genid_bump_ipv4(net); | |
789 | else | |
790 | rt_genid_bump_ipv6(net); | |
791 | ||
a0073fe1 SK |
792 | if (delpol) { |
793 | xfrm_policy_requeue(delpol, policy); | |
29fa0b30 | 794 | __xfrm_policy_unlink(delpol, dir); |
a0073fe1 | 795 | } |
e682adf0 | 796 | policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir, policy->index); |
1121994c | 797 | hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index)); |
9d729f72 | 798 | policy->curlft.add_time = get_seconds(); |
1da177e4 LT |
799 | policy->curlft.use_time = 0; |
800 | if (!mod_timer(&policy->timer, jiffies + HZ)) | |
801 | xfrm_pol_hold(policy); | |
283bc9f3 | 802 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 | 803 | |
9b78a82c | 804 | if (delpol) |
1da177e4 | 805 | xfrm_policy_kill(delpol); |
1121994c AD |
806 | else if (xfrm_bydst_should_resize(net, dir, NULL)) |
807 | schedule_work(&net->xfrm.policy_hash_work); | |
9b78a82c | 808 | |
1da177e4 LT |
809 | return 0; |
810 | } | |
811 | EXPORT_SYMBOL(xfrm_policy_insert); | |
812 | ||
8ca2e93b JHS |
813 | struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type, |
814 | int dir, struct xfrm_selector *sel, | |
ef41aaa0 EP |
815 | struct xfrm_sec_ctx *ctx, int delete, |
816 | int *err) | |
1da177e4 | 817 | { |
2518c7c2 DM |
818 | struct xfrm_policy *pol, *ret; |
819 | struct hlist_head *chain; | |
1da177e4 | 820 | |
ef41aaa0 | 821 | *err = 0; |
283bc9f3 | 822 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
8d1211a6 | 823 | chain = policy_hash_bysel(net, sel, sel->family, dir); |
2518c7c2 | 824 | ret = NULL; |
b67bfe0d | 825 | hlist_for_each_entry(pol, chain, bydst) { |
2518c7c2 | 826 | if (pol->type == type && |
34f8d884 | 827 | (mark & pol->mark.m) == pol->mark.v && |
2518c7c2 DM |
828 | !selector_cmp(sel, &pol->selector) && |
829 | xfrm_sec_ctx_match(ctx, pol->security)) { | |
1da177e4 | 830 | xfrm_pol_hold(pol); |
2518c7c2 | 831 | if (delete) { |
03e1ad7b PM |
832 | *err = security_xfrm_policy_delete( |
833 | pol->security); | |
ef41aaa0 | 834 | if (*err) { |
283bc9f3 | 835 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
ef41aaa0 EP |
836 | return pol; |
837 | } | |
29fa0b30 | 838 | __xfrm_policy_unlink(pol, dir); |
2518c7c2 DM |
839 | } |
840 | ret = pol; | |
1da177e4 LT |
841 | break; |
842 | } | |
843 | } | |
283bc9f3 | 844 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 | 845 | |
fe1a5f03 | 846 | if (ret && delete) |
2518c7c2 | 847 | xfrm_policy_kill(ret); |
2518c7c2 | 848 | return ret; |
1da177e4 | 849 | } |
df71837d | 850 | EXPORT_SYMBOL(xfrm_policy_bysel_ctx); |
1da177e4 | 851 | |
8ca2e93b JHS |
852 | struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type, |
853 | int dir, u32 id, int delete, int *err) | |
1da177e4 | 854 | { |
2518c7c2 DM |
855 | struct xfrm_policy *pol, *ret; |
856 | struct hlist_head *chain; | |
1da177e4 | 857 | |
b5505c6e HX |
858 | *err = -ENOENT; |
859 | if (xfrm_policy_id2dir(id) != dir) | |
860 | return NULL; | |
861 | ||
ef41aaa0 | 862 | *err = 0; |
283bc9f3 | 863 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
8d1211a6 | 864 | chain = net->xfrm.policy_byidx + idx_hash(net, id); |
2518c7c2 | 865 | ret = NULL; |
b67bfe0d | 866 | hlist_for_each_entry(pol, chain, byidx) { |
34f8d884 JHS |
867 | if (pol->type == type && pol->index == id && |
868 | (mark & pol->mark.m) == pol->mark.v) { | |
1da177e4 | 869 | xfrm_pol_hold(pol); |
2518c7c2 | 870 | if (delete) { |
03e1ad7b PM |
871 | *err = security_xfrm_policy_delete( |
872 | pol->security); | |
ef41aaa0 | 873 | if (*err) { |
283bc9f3 | 874 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
ef41aaa0 EP |
875 | return pol; |
876 | } | |
29fa0b30 | 877 | __xfrm_policy_unlink(pol, dir); |
2518c7c2 DM |
878 | } |
879 | ret = pol; | |
1da177e4 LT |
880 | break; |
881 | } | |
882 | } | |
283bc9f3 | 883 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 | 884 | |
fe1a5f03 | 885 | if (ret && delete) |
2518c7c2 | 886 | xfrm_policy_kill(ret); |
2518c7c2 | 887 | return ret; |
1da177e4 LT |
888 | } |
889 | EXPORT_SYMBOL(xfrm_policy_byid); | |
890 | ||
4aa2e62c JL |
891 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
892 | static inline int | |
2e71029e | 893 | xfrm_policy_flush_secctx_check(struct net *net, u8 type, bool task_valid) |
1da177e4 | 894 | { |
4aa2e62c JL |
895 | int dir, err = 0; |
896 | ||
897 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { | |
898 | struct xfrm_policy *pol; | |
4aa2e62c JL |
899 | int i; |
900 | ||
b67bfe0d | 901 | hlist_for_each_entry(pol, |
33ffbbd5 | 902 | &net->xfrm.policy_inexact[dir], bydst) { |
4aa2e62c JL |
903 | if (pol->type != type) |
904 | continue; | |
03e1ad7b | 905 | err = security_xfrm_policy_delete(pol->security); |
4aa2e62c | 906 | if (err) { |
2e71029e | 907 | xfrm_audit_policy_delete(pol, 0, task_valid); |
4aa2e62c JL |
908 | return err; |
909 | } | |
7dc12d6d | 910 | } |
33ffbbd5 | 911 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { |
b67bfe0d | 912 | hlist_for_each_entry(pol, |
33ffbbd5 | 913 | net->xfrm.policy_bydst[dir].table + i, |
4aa2e62c JL |
914 | bydst) { |
915 | if (pol->type != type) | |
916 | continue; | |
03e1ad7b PM |
917 | err = security_xfrm_policy_delete( |
918 | pol->security); | |
4aa2e62c | 919 | if (err) { |
ab5f5e8b | 920 | xfrm_audit_policy_delete(pol, 0, |
2e71029e | 921 | task_valid); |
4aa2e62c JL |
922 | return err; |
923 | } | |
924 | } | |
925 | } | |
926 | } | |
927 | return err; | |
928 | } | |
929 | #else | |
930 | static inline int | |
2e71029e | 931 | xfrm_policy_flush_secctx_check(struct net *net, u8 type, bool task_valid) |
4aa2e62c JL |
932 | { |
933 | return 0; | |
934 | } | |
935 | #endif | |
936 | ||
2e71029e | 937 | int xfrm_policy_flush(struct net *net, u8 type, bool task_valid) |
4aa2e62c | 938 | { |
2f1eb65f | 939 | int dir, err = 0, cnt = 0; |
1da177e4 | 940 | |
283bc9f3 | 941 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
4aa2e62c | 942 | |
2e71029e | 943 | err = xfrm_policy_flush_secctx_check(net, type, task_valid); |
4aa2e62c JL |
944 | if (err) |
945 | goto out; | |
946 | ||
1da177e4 | 947 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
2518c7c2 | 948 | struct xfrm_policy *pol; |
29fa0b30 | 949 | int i; |
2518c7c2 DM |
950 | |
951 | again1: | |
b67bfe0d | 952 | hlist_for_each_entry(pol, |
33ffbbd5 | 953 | &net->xfrm.policy_inexact[dir], bydst) { |
2518c7c2 DM |
954 | if (pol->type != type) |
955 | continue; | |
ea2dea9d | 956 | __xfrm_policy_unlink(pol, dir); |
283bc9f3 | 957 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
ea2dea9d | 958 | cnt++; |
1da177e4 | 959 | |
2e71029e | 960 | xfrm_audit_policy_delete(pol, 1, task_valid); |
161a09e7 | 961 | |
2518c7c2 | 962 | xfrm_policy_kill(pol); |
1da177e4 | 963 | |
283bc9f3 | 964 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
2518c7c2 DM |
965 | goto again1; |
966 | } | |
967 | ||
33ffbbd5 | 968 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { |
2518c7c2 | 969 | again2: |
b67bfe0d | 970 | hlist_for_each_entry(pol, |
33ffbbd5 | 971 | net->xfrm.policy_bydst[dir].table + i, |
2518c7c2 DM |
972 | bydst) { |
973 | if (pol->type != type) | |
974 | continue; | |
ea2dea9d | 975 | __xfrm_policy_unlink(pol, dir); |
283bc9f3 | 976 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
ea2dea9d | 977 | cnt++; |
2518c7c2 | 978 | |
2e71029e | 979 | xfrm_audit_policy_delete(pol, 1, task_valid); |
2518c7c2 DM |
980 | xfrm_policy_kill(pol); |
981 | ||
283bc9f3 | 982 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
2518c7c2 DM |
983 | goto again2; |
984 | } | |
1da177e4 | 985 | } |
2518c7c2 | 986 | |
1da177e4 | 987 | } |
2f1eb65f JHS |
988 | if (!cnt) |
989 | err = -ESRCH; | |
4aa2e62c | 990 | out: |
283bc9f3 | 991 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
4aa2e62c | 992 | return err; |
1da177e4 LT |
993 | } |
994 | EXPORT_SYMBOL(xfrm_policy_flush); | |
995 | ||
cdcbca7c | 996 | int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, |
4c563f76 | 997 | int (*func)(struct xfrm_policy *, int, int, void*), |
1da177e4 LT |
998 | void *data) |
999 | { | |
12a169e7 HX |
1000 | struct xfrm_policy *pol; |
1001 | struct xfrm_policy_walk_entry *x; | |
4c563f76 TT |
1002 | int error = 0; |
1003 | ||
1004 | if (walk->type >= XFRM_POLICY_TYPE_MAX && | |
1005 | walk->type != XFRM_POLICY_TYPE_ANY) | |
1006 | return -EINVAL; | |
1da177e4 | 1007 | |
12a169e7 | 1008 | if (list_empty(&walk->walk.all) && walk->seq != 0) |
4c563f76 TT |
1009 | return 0; |
1010 | ||
283bc9f3 | 1011 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
12a169e7 | 1012 | if (list_empty(&walk->walk.all)) |
cdcbca7c | 1013 | x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all); |
12a169e7 HX |
1014 | else |
1015 | x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all); | |
cdcbca7c | 1016 | list_for_each_entry_from(x, &net->xfrm.policy_all, all) { |
12a169e7 | 1017 | if (x->dead) |
4c563f76 | 1018 | continue; |
12a169e7 HX |
1019 | pol = container_of(x, struct xfrm_policy, walk); |
1020 | if (walk->type != XFRM_POLICY_TYPE_ANY && | |
1021 | walk->type != pol->type) | |
1022 | continue; | |
1023 | error = func(pol, xfrm_policy_id2dir(pol->index), | |
1024 | walk->seq, data); | |
1025 | if (error) { | |
1026 | list_move_tail(&walk->walk.all, &x->all); | |
1027 | goto out; | |
2518c7c2 | 1028 | } |
12a169e7 | 1029 | walk->seq++; |
1da177e4 | 1030 | } |
12a169e7 | 1031 | if (walk->seq == 0) { |
baf5d743 JHS |
1032 | error = -ENOENT; |
1033 | goto out; | |
1034 | } | |
12a169e7 | 1035 | list_del_init(&walk->walk.all); |
1da177e4 | 1036 | out: |
283bc9f3 | 1037 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 LT |
1038 | return error; |
1039 | } | |
1040 | EXPORT_SYMBOL(xfrm_policy_walk); | |
1041 | ||
12a169e7 HX |
1042 | void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type) |
1043 | { | |
1044 | INIT_LIST_HEAD(&walk->walk.all); | |
1045 | walk->walk.dead = 1; | |
1046 | walk->type = type; | |
1047 | walk->seq = 0; | |
1048 | } | |
1049 | EXPORT_SYMBOL(xfrm_policy_walk_init); | |
1050 | ||
283bc9f3 | 1051 | void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net) |
12a169e7 HX |
1052 | { |
1053 | if (list_empty(&walk->walk.all)) | |
1054 | return; | |
1055 | ||
283bc9f3 | 1056 | write_lock_bh(&net->xfrm.xfrm_policy_lock); /*FIXME where is net? */ |
12a169e7 | 1057 | list_del(&walk->walk.all); |
283bc9f3 | 1058 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
12a169e7 HX |
1059 | } |
1060 | EXPORT_SYMBOL(xfrm_policy_walk_done); | |
1061 | ||
134b0fc5 JM |
1062 | /* |
1063 | * Find policy to apply to this flow. | |
1064 | * | |
1065 | * Returns 0 if policy found, else an -errno. | |
1066 | */ | |
f299d557 DM |
1067 | static int xfrm_policy_match(const struct xfrm_policy *pol, |
1068 | const struct flowi *fl, | |
2518c7c2 | 1069 | u8 type, u16 family, int dir) |
1da177e4 | 1070 | { |
f299d557 | 1071 | const struct xfrm_selector *sel = &pol->selector; |
bc9b35ad DM |
1072 | int ret = -ESRCH; |
1073 | bool match; | |
1da177e4 | 1074 | |
2518c7c2 | 1075 | if (pol->family != family || |
1d28f42c | 1076 | (fl->flowi_mark & pol->mark.m) != pol->mark.v || |
2518c7c2 | 1077 | pol->type != type) |
134b0fc5 | 1078 | return ret; |
1da177e4 | 1079 | |
2518c7c2 | 1080 | match = xfrm_selector_match(sel, fl, family); |
134b0fc5 | 1081 | if (match) |
1d28f42c | 1082 | ret = security_xfrm_policy_lookup(pol->security, fl->flowi_secid, |
03e1ad7b | 1083 | dir); |
2518c7c2 | 1084 | |
134b0fc5 | 1085 | return ret; |
2518c7c2 | 1086 | } |
1da177e4 | 1087 | |
52479b62 | 1088 | static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type, |
062cdb43 | 1089 | const struct flowi *fl, |
2518c7c2 DM |
1090 | u16 family, u8 dir) |
1091 | { | |
134b0fc5 | 1092 | int err; |
2518c7c2 | 1093 | struct xfrm_policy *pol, *ret; |
0b597e7e | 1094 | const xfrm_address_t *daddr, *saddr; |
2518c7c2 | 1095 | struct hlist_head *chain; |
acba48e1 | 1096 | u32 priority = ~0U; |
df71837d | 1097 | |
2518c7c2 DM |
1098 | daddr = xfrm_flowi_daddr(fl, family); |
1099 | saddr = xfrm_flowi_saddr(fl, family); | |
1100 | if (unlikely(!daddr || !saddr)) | |
1101 | return NULL; | |
1102 | ||
283bc9f3 | 1103 | read_lock_bh(&net->xfrm.xfrm_policy_lock); |
52479b62 | 1104 | chain = policy_hash_direct(net, daddr, saddr, family, dir); |
2518c7c2 | 1105 | ret = NULL; |
b67bfe0d | 1106 | hlist_for_each_entry(pol, chain, bydst) { |
134b0fc5 JM |
1107 | err = xfrm_policy_match(pol, fl, type, family, dir); |
1108 | if (err) { | |
1109 | if (err == -ESRCH) | |
1110 | continue; | |
1111 | else { | |
1112 | ret = ERR_PTR(err); | |
1113 | goto fail; | |
1114 | } | |
1115 | } else { | |
2518c7c2 | 1116 | ret = pol; |
acba48e1 | 1117 | priority = ret->priority; |
2518c7c2 DM |
1118 | break; |
1119 | } | |
1120 | } | |
52479b62 | 1121 | chain = &net->xfrm.policy_inexact[dir]; |
b67bfe0d | 1122 | hlist_for_each_entry(pol, chain, bydst) { |
134b0fc5 JM |
1123 | err = xfrm_policy_match(pol, fl, type, family, dir); |
1124 | if (err) { | |
1125 | if (err == -ESRCH) | |
1126 | continue; | |
1127 | else { | |
1128 | ret = ERR_PTR(err); | |
1129 | goto fail; | |
1130 | } | |
1131 | } else if (pol->priority < priority) { | |
acba48e1 DM |
1132 | ret = pol; |
1133 | break; | |
1da177e4 LT |
1134 | } |
1135 | } | |
acba48e1 DM |
1136 | if (ret) |
1137 | xfrm_pol_hold(ret); | |
134b0fc5 | 1138 | fail: |
283bc9f3 | 1139 | read_unlock_bh(&net->xfrm.xfrm_policy_lock); |
4e81bb83 | 1140 | |
2518c7c2 | 1141 | return ret; |
4e81bb83 MN |
1142 | } |
1143 | ||
80c802f3 | 1144 | static struct xfrm_policy * |
73ff93cd | 1145 | __xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir) |
80c802f3 TT |
1146 | { |
1147 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1148 | struct xfrm_policy *pol; | |
1149 | ||
1150 | pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir); | |
1151 | if (pol != NULL) | |
1152 | return pol; | |
1153 | #endif | |
1154 | return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir); | |
1155 | } | |
1156 | ||
b5fb82c4 BZ |
1157 | static int flow_to_policy_dir(int dir) |
1158 | { | |
1159 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
1160 | XFRM_POLICY_OUT == FLOW_DIR_OUT && | |
1161 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
1162 | return dir; | |
1163 | ||
1164 | switch (dir) { | |
1165 | default: | |
1166 | case FLOW_DIR_IN: | |
1167 | return XFRM_POLICY_IN; | |
1168 | case FLOW_DIR_OUT: | |
1169 | return XFRM_POLICY_OUT; | |
1170 | case FLOW_DIR_FWD: | |
1171 | return XFRM_POLICY_FWD; | |
1172 | } | |
1173 | } | |
1174 | ||
fe1a5f03 | 1175 | static struct flow_cache_object * |
dee9f4bc | 1176 | xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, |
fe1a5f03 | 1177 | u8 dir, struct flow_cache_object *old_obj, void *ctx) |
4e81bb83 MN |
1178 | { |
1179 | struct xfrm_policy *pol; | |
fe1a5f03 TT |
1180 | |
1181 | if (old_obj) | |
1182 | xfrm_pol_put(container_of(old_obj, struct xfrm_policy, flo)); | |
4e81bb83 | 1183 | |
b5fb82c4 | 1184 | pol = __xfrm_policy_lookup(net, fl, family, flow_to_policy_dir(dir)); |
80c802f3 | 1185 | if (IS_ERR_OR_NULL(pol)) |
fe1a5f03 | 1186 | return ERR_CAST(pol); |
fe1a5f03 | 1187 | |
fe1a5f03 TT |
1188 | /* Resolver returns two references: |
1189 | * one for cache and one for caller of flow_cache_lookup() */ | |
1190 | xfrm_pol_hold(pol); | |
1191 | ||
1192 | return &pol->flo; | |
1da177e4 LT |
1193 | } |
1194 | ||
df71837d TJ |
1195 | static inline int policy_to_flow_dir(int dir) |
1196 | { | |
1197 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
a716c119 YH |
1198 | XFRM_POLICY_OUT == FLOW_DIR_OUT && |
1199 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
1200 | return dir; | |
1201 | switch (dir) { | |
1202 | default: | |
1203 | case XFRM_POLICY_IN: | |
1204 | return FLOW_DIR_IN; | |
1205 | case XFRM_POLICY_OUT: | |
1206 | return FLOW_DIR_OUT; | |
1207 | case XFRM_POLICY_FWD: | |
1208 | return FLOW_DIR_FWD; | |
3ff50b79 | 1209 | } |
df71837d TJ |
1210 | } |
1211 | ||
dee9f4bc DM |
1212 | static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, |
1213 | const struct flowi *fl) | |
1da177e4 LT |
1214 | { |
1215 | struct xfrm_policy *pol; | |
283bc9f3 | 1216 | struct net *net = sock_net(sk); |
1da177e4 | 1217 | |
283bc9f3 | 1218 | read_lock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 | 1219 | if ((pol = sk->sk_policy[dir]) != NULL) { |
bc9b35ad DM |
1220 | bool match = xfrm_selector_match(&pol->selector, fl, |
1221 | sk->sk_family); | |
a716c119 | 1222 | int err = 0; |
df71837d | 1223 | |
3bccfbc7 | 1224 | if (match) { |
34f8d884 JHS |
1225 | if ((sk->sk_mark & pol->mark.m) != pol->mark.v) { |
1226 | pol = NULL; | |
1227 | goto out; | |
1228 | } | |
03e1ad7b | 1229 | err = security_xfrm_policy_lookup(pol->security, |
1d28f42c | 1230 | fl->flowi_secid, |
03e1ad7b | 1231 | policy_to_flow_dir(dir)); |
3bccfbc7 VY |
1232 | if (!err) |
1233 | xfrm_pol_hold(pol); | |
1234 | else if (err == -ESRCH) | |
1235 | pol = NULL; | |
1236 | else | |
1237 | pol = ERR_PTR(err); | |
1238 | } else | |
1da177e4 LT |
1239 | pol = NULL; |
1240 | } | |
34f8d884 | 1241 | out: |
283bc9f3 | 1242 | read_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 LT |
1243 | return pol; |
1244 | } | |
1245 | ||
1246 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) | |
1247 | { | |
98806f75 | 1248 | struct net *net = xp_net(pol); |
4e81bb83 | 1249 | |
98806f75 | 1250 | list_add(&pol->walk.all, &net->xfrm.policy_all); |
98806f75 | 1251 | net->xfrm.policy_count[dir]++; |
1da177e4 LT |
1252 | xfrm_pol_hold(pol); |
1253 | } | |
1254 | ||
1255 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, | |
1256 | int dir) | |
1257 | { | |
98806f75 AD |
1258 | struct net *net = xp_net(pol); |
1259 | ||
53c2e285 | 1260 | if (list_empty(&pol->walk.all)) |
2518c7c2 | 1261 | return NULL; |
1da177e4 | 1262 | |
53c2e285 HX |
1263 | /* Socket policies are not hashed. */ |
1264 | if (!hlist_unhashed(&pol->bydst)) { | |
1265 | hlist_del(&pol->bydst); | |
1266 | hlist_del(&pol->byidx); | |
1267 | } | |
1268 | ||
1269 | list_del_init(&pol->walk.all); | |
98806f75 | 1270 | net->xfrm.policy_count[dir]--; |
2518c7c2 DM |
1271 | |
1272 | return pol; | |
1da177e4 LT |
1273 | } |
1274 | ||
53c2e285 HX |
1275 | static void xfrm_sk_policy_link(struct xfrm_policy *pol, int dir) |
1276 | { | |
1277 | __xfrm_policy_link(pol, XFRM_POLICY_MAX + dir); | |
1278 | } | |
1279 | ||
1280 | static void xfrm_sk_policy_unlink(struct xfrm_policy *pol, int dir) | |
1281 | { | |
1282 | __xfrm_policy_unlink(pol, XFRM_POLICY_MAX + dir); | |
1283 | } | |
1284 | ||
4666faab | 1285 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir) |
1da177e4 | 1286 | { |
283bc9f3 FD |
1287 | struct net *net = xp_net(pol); |
1288 | ||
1289 | write_lock_bh(&net->xfrm.xfrm_policy_lock); | |
1da177e4 | 1290 | pol = __xfrm_policy_unlink(pol, dir); |
283bc9f3 | 1291 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 | 1292 | if (pol) { |
1da177e4 | 1293 | xfrm_policy_kill(pol); |
4666faab | 1294 | return 0; |
1da177e4 | 1295 | } |
4666faab | 1296 | return -ENOENT; |
1da177e4 | 1297 | } |
a70fcb0b | 1298 | EXPORT_SYMBOL(xfrm_policy_delete); |
1da177e4 LT |
1299 | |
1300 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) | |
1301 | { | |
1121994c | 1302 | struct net *net = xp_net(pol); |
1da177e4 LT |
1303 | struct xfrm_policy *old_pol; |
1304 | ||
4e81bb83 MN |
1305 | #ifdef CONFIG_XFRM_SUB_POLICY |
1306 | if (pol && pol->type != XFRM_POLICY_TYPE_MAIN) | |
1307 | return -EINVAL; | |
1308 | #endif | |
1309 | ||
283bc9f3 | 1310 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 LT |
1311 | old_pol = sk->sk_policy[dir]; |
1312 | sk->sk_policy[dir] = pol; | |
1313 | if (pol) { | |
9d729f72 | 1314 | pol->curlft.add_time = get_seconds(); |
e682adf0 | 1315 | pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir, 0); |
53c2e285 | 1316 | xfrm_sk_policy_link(pol, dir); |
1da177e4 | 1317 | } |
a0073fe1 SK |
1318 | if (old_pol) { |
1319 | if (pol) | |
1320 | xfrm_policy_requeue(old_pol, pol); | |
1321 | ||
ea2dea9d TT |
1322 | /* Unlinking succeeds always. This is the only function |
1323 | * allowed to delete or replace socket policy. | |
1324 | */ | |
53c2e285 | 1325 | xfrm_sk_policy_unlink(old_pol, dir); |
a0073fe1 | 1326 | } |
283bc9f3 | 1327 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 LT |
1328 | |
1329 | if (old_pol) { | |
1330 | xfrm_policy_kill(old_pol); | |
1331 | } | |
1332 | return 0; | |
1333 | } | |
1334 | ||
d3e40a9f | 1335 | static struct xfrm_policy *clone_policy(const struct xfrm_policy *old, int dir) |
1da177e4 | 1336 | { |
0331b1f3 | 1337 | struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC); |
283bc9f3 | 1338 | struct net *net = xp_net(old); |
1da177e4 LT |
1339 | |
1340 | if (newp) { | |
1341 | newp->selector = old->selector; | |
03e1ad7b PM |
1342 | if (security_xfrm_policy_clone(old->security, |
1343 | &newp->security)) { | |
df71837d TJ |
1344 | kfree(newp); |
1345 | return NULL; /* ENOMEM */ | |
1346 | } | |
1da177e4 LT |
1347 | newp->lft = old->lft; |
1348 | newp->curlft = old->curlft; | |
fb977e2c | 1349 | newp->mark = old->mark; |
1da177e4 LT |
1350 | newp->action = old->action; |
1351 | newp->flags = old->flags; | |
1352 | newp->xfrm_nr = old->xfrm_nr; | |
1353 | newp->index = old->index; | |
4e81bb83 | 1354 | newp->type = old->type; |
1da177e4 LT |
1355 | memcpy(newp->xfrm_vec, old->xfrm_vec, |
1356 | newp->xfrm_nr*sizeof(struct xfrm_tmpl)); | |
283bc9f3 | 1357 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
53c2e285 | 1358 | xfrm_sk_policy_link(newp, dir); |
283bc9f3 | 1359 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 LT |
1360 | xfrm_pol_put(newp); |
1361 | } | |
1362 | return newp; | |
1363 | } | |
1364 | ||
1365 | int __xfrm_sk_clone_policy(struct sock *sk) | |
1366 | { | |
1367 | struct xfrm_policy *p0 = sk->sk_policy[0], | |
1368 | *p1 = sk->sk_policy[1]; | |
1369 | ||
1370 | sk->sk_policy[0] = sk->sk_policy[1] = NULL; | |
1371 | if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL) | |
1372 | return -ENOMEM; | |
1373 | if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL) | |
1374 | return -ENOMEM; | |
1375 | return 0; | |
1376 | } | |
1377 | ||
a1e59abf | 1378 | static int |
fbda33b2 | 1379 | xfrm_get_saddr(struct net *net, xfrm_address_t *local, xfrm_address_t *remote, |
a1e59abf PM |
1380 | unsigned short family) |
1381 | { | |
1382 | int err; | |
1383 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1384 | ||
1385 | if (unlikely(afinfo == NULL)) | |
1386 | return -EINVAL; | |
fbda33b2 | 1387 | err = afinfo->get_saddr(net, local, remote); |
a1e59abf PM |
1388 | xfrm_policy_put_afinfo(afinfo); |
1389 | return err; | |
1390 | } | |
1391 | ||
1da177e4 LT |
1392 | /* Resolve list of templates for the flow, given policy. */ |
1393 | ||
1394 | static int | |
a6c2e611 DM |
1395 | xfrm_tmpl_resolve_one(struct xfrm_policy *policy, const struct flowi *fl, |
1396 | struct xfrm_state **xfrm, unsigned short family) | |
1da177e4 | 1397 | { |
fbda33b2 | 1398 | struct net *net = xp_net(policy); |
1da177e4 LT |
1399 | int nx; |
1400 | int i, error; | |
1401 | xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); | |
1402 | xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); | |
a1e59abf | 1403 | xfrm_address_t tmp; |
1da177e4 | 1404 | |
9b7a787d | 1405 | for (nx = 0, i = 0; i < policy->xfrm_nr; i++) { |
1da177e4 LT |
1406 | struct xfrm_state *x; |
1407 | xfrm_address_t *remote = daddr; | |
1408 | xfrm_address_t *local = saddr; | |
1409 | struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; | |
1410 | ||
48b8d783 JK |
1411 | if (tmpl->mode == XFRM_MODE_TUNNEL || |
1412 | tmpl->mode == XFRM_MODE_BEET) { | |
1da177e4 LT |
1413 | remote = &tmpl->id.daddr; |
1414 | local = &tmpl->saddr; | |
8444cf71 TE |
1415 | if (xfrm_addr_any(local, tmpl->encap_family)) { |
1416 | error = xfrm_get_saddr(net, &tmp, remote, tmpl->encap_family); | |
a1e59abf PM |
1417 | if (error) |
1418 | goto fail; | |
1419 | local = &tmp; | |
1420 | } | |
1da177e4 LT |
1421 | } |
1422 | ||
1423 | x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); | |
1424 | ||
1425 | if (x && x->km.state == XFRM_STATE_VALID) { | |
1426 | xfrm[nx++] = x; | |
1427 | daddr = remote; | |
1428 | saddr = local; | |
1429 | continue; | |
1430 | } | |
1431 | if (x) { | |
1432 | error = (x->km.state == XFRM_STATE_ERROR ? | |
1433 | -EINVAL : -EAGAIN); | |
1434 | xfrm_state_put(x); | |
42054569 | 1435 | } else if (error == -ESRCH) { |
a4322266 | 1436 | error = -EAGAIN; |
42054569 | 1437 | } |
1da177e4 LT |
1438 | |
1439 | if (!tmpl->optional) | |
1440 | goto fail; | |
1441 | } | |
1442 | return nx; | |
1443 | ||
1444 | fail: | |
9b7a787d | 1445 | for (nx--; nx >= 0; nx--) |
1da177e4 LT |
1446 | xfrm_state_put(xfrm[nx]); |
1447 | return error; | |
1448 | } | |
1449 | ||
4e81bb83 | 1450 | static int |
a6c2e611 DM |
1451 | xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, const struct flowi *fl, |
1452 | struct xfrm_state **xfrm, unsigned short family) | |
4e81bb83 | 1453 | { |
41a49cc3 MN |
1454 | struct xfrm_state *tp[XFRM_MAX_DEPTH]; |
1455 | struct xfrm_state **tpp = (npols > 1) ? tp : xfrm; | |
4e81bb83 MN |
1456 | int cnx = 0; |
1457 | int error; | |
1458 | int ret; | |
1459 | int i; | |
1460 | ||
1461 | for (i = 0; i < npols; i++) { | |
1462 | if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
1463 | error = -ENOBUFS; | |
1464 | goto fail; | |
1465 | } | |
41a49cc3 MN |
1466 | |
1467 | ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family); | |
4e81bb83 MN |
1468 | if (ret < 0) { |
1469 | error = ret; | |
1470 | goto fail; | |
1471 | } else | |
1472 | cnx += ret; | |
1473 | } | |
1474 | ||
41a49cc3 MN |
1475 | /* found states are sorted for outbound processing */ |
1476 | if (npols > 1) | |
1477 | xfrm_state_sort(xfrm, tpp, cnx, family); | |
1478 | ||
4e81bb83 MN |
1479 | return cnx; |
1480 | ||
1481 | fail: | |
9b7a787d | 1482 | for (cnx--; cnx >= 0; cnx--) |
41a49cc3 | 1483 | xfrm_state_put(tpp[cnx]); |
4e81bb83 MN |
1484 | return error; |
1485 | ||
1486 | } | |
1487 | ||
1da177e4 LT |
1488 | /* Check that the bundle accepts the flow and its components are |
1489 | * still valid. | |
1490 | */ | |
1491 | ||
05d84025 | 1492 | static inline int xfrm_get_tos(const struct flowi *fl, int family) |
25ee3286 HX |
1493 | { |
1494 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1495 | int tos; | |
1da177e4 | 1496 | |
25ee3286 HX |
1497 | if (!afinfo) |
1498 | return -EINVAL; | |
1499 | ||
1500 | tos = afinfo->get_tos(fl); | |
1501 | ||
1502 | xfrm_policy_put_afinfo(afinfo); | |
1503 | ||
1504 | return tos; | |
1505 | } | |
1506 | ||
80c802f3 TT |
1507 | static struct flow_cache_object *xfrm_bundle_flo_get(struct flow_cache_object *flo) |
1508 | { | |
1509 | struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); | |
1510 | struct dst_entry *dst = &xdst->u.dst; | |
1511 | ||
1512 | if (xdst->route == NULL) { | |
1513 | /* Dummy bundle - if it has xfrms we were not | |
1514 | * able to build bundle as template resolution failed. | |
1515 | * It means we need to try again resolving. */ | |
1516 | if (xdst->num_xfrms > 0) | |
1517 | return NULL; | |
a0073fe1 SK |
1518 | } else if (dst->flags & DST_XFRM_QUEUE) { |
1519 | return NULL; | |
80c802f3 TT |
1520 | } else { |
1521 | /* Real bundle */ | |
1522 | if (stale_bundle(dst)) | |
1523 | return NULL; | |
1524 | } | |
1525 | ||
1526 | dst_hold(dst); | |
1527 | return flo; | |
1528 | } | |
1529 | ||
1530 | static int xfrm_bundle_flo_check(struct flow_cache_object *flo) | |
1531 | { | |
1532 | struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); | |
1533 | struct dst_entry *dst = &xdst->u.dst; | |
1534 | ||
1535 | if (!xdst->route) | |
1536 | return 0; | |
1537 | if (stale_bundle(dst)) | |
1538 | return 0; | |
1539 | ||
1540 | return 1; | |
1541 | } | |
1542 | ||
1543 | static void xfrm_bundle_flo_delete(struct flow_cache_object *flo) | |
1544 | { | |
1545 | struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); | |
1546 | struct dst_entry *dst = &xdst->u.dst; | |
1547 | ||
1548 | dst_free(dst); | |
1549 | } | |
1550 | ||
1551 | static const struct flow_cache_ops xfrm_bundle_fc_ops = { | |
1552 | .get = xfrm_bundle_flo_get, | |
1553 | .check = xfrm_bundle_flo_check, | |
1554 | .delete = xfrm_bundle_flo_delete, | |
1555 | }; | |
1556 | ||
d7c7544c | 1557 | static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family) |
1da177e4 | 1558 | { |
1da177e4 | 1559 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
d7c7544c | 1560 | struct dst_ops *dst_ops; |
25ee3286 HX |
1561 | struct xfrm_dst *xdst; |
1562 | ||
1563 | if (!afinfo) | |
1564 | return ERR_PTR(-EINVAL); | |
1565 | ||
d7c7544c AD |
1566 | switch (family) { |
1567 | case AF_INET: | |
1568 | dst_ops = &net->xfrm.xfrm4_dst_ops; | |
1569 | break; | |
dfd56b8b | 1570 | #if IS_ENABLED(CONFIG_IPV6) |
d7c7544c AD |
1571 | case AF_INET6: |
1572 | dst_ops = &net->xfrm.xfrm6_dst_ops; | |
1573 | break; | |
1574 | #endif | |
1575 | default: | |
1576 | BUG(); | |
1577 | } | |
f5b0a874 | 1578 | xdst = dst_alloc(dst_ops, NULL, 0, DST_OBSOLETE_NONE, 0); |
25ee3286 | 1579 | |
d4cae562 | 1580 | if (likely(xdst)) { |
141e369d SK |
1581 | struct dst_entry *dst = &xdst->u.dst; |
1582 | ||
1583 | memset(dst + 1, 0, sizeof(*xdst) - sizeof(*dst)); | |
0b150932 | 1584 | xdst->flo.ops = &xfrm_bundle_fc_ops; |
9d7b0fc1 PM |
1585 | if (afinfo->init_dst) |
1586 | afinfo->init_dst(net, xdst); | |
d4cae562 | 1587 | } else |
0b150932 | 1588 | xdst = ERR_PTR(-ENOBUFS); |
80c802f3 | 1589 | |
d4cae562 MB |
1590 | xfrm_policy_put_afinfo(afinfo); |
1591 | ||
25ee3286 HX |
1592 | return xdst; |
1593 | } | |
1594 | ||
a1b05140 MN |
1595 | static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst, |
1596 | int nfheader_len) | |
1597 | { | |
1598 | struct xfrm_policy_afinfo *afinfo = | |
1599 | xfrm_policy_get_afinfo(dst->ops->family); | |
1600 | int err; | |
1601 | ||
1602 | if (!afinfo) | |
1603 | return -EINVAL; | |
1604 | ||
1605 | err = afinfo->init_path(path, dst, nfheader_len); | |
1606 | ||
1607 | xfrm_policy_put_afinfo(afinfo); | |
1608 | ||
1609 | return err; | |
1610 | } | |
1611 | ||
87c1e12b | 1612 | static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev, |
0c7b3eef | 1613 | const struct flowi *fl) |
25ee3286 HX |
1614 | { |
1615 | struct xfrm_policy_afinfo *afinfo = | |
1616 | xfrm_policy_get_afinfo(xdst->u.dst.ops->family); | |
1617 | int err; | |
1618 | ||
1619 | if (!afinfo) | |
1da177e4 | 1620 | return -EINVAL; |
25ee3286 | 1621 | |
87c1e12b | 1622 | err = afinfo->fill_dst(xdst, dev, fl); |
25ee3286 | 1623 | |
1da177e4 | 1624 | xfrm_policy_put_afinfo(afinfo); |
25ee3286 | 1625 | |
1da177e4 LT |
1626 | return err; |
1627 | } | |
1628 | ||
80c802f3 | 1629 | |
25ee3286 HX |
1630 | /* Allocate chain of dst_entry's, attach known xfrm's, calculate |
1631 | * all the metrics... Shortly, bundle a bundle. | |
1632 | */ | |
1633 | ||
1634 | static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy, | |
1635 | struct xfrm_state **xfrm, int nx, | |
98313ada | 1636 | const struct flowi *fl, |
25ee3286 HX |
1637 | struct dst_entry *dst) |
1638 | { | |
d7c7544c | 1639 | struct net *net = xp_net(policy); |
25ee3286 HX |
1640 | unsigned long now = jiffies; |
1641 | struct net_device *dev; | |
43a4dea4 | 1642 | struct xfrm_mode *inner_mode; |
25ee3286 HX |
1643 | struct dst_entry *dst_prev = NULL; |
1644 | struct dst_entry *dst0 = NULL; | |
1645 | int i = 0; | |
1646 | int err; | |
1647 | int header_len = 0; | |
a1b05140 | 1648 | int nfheader_len = 0; |
25ee3286 HX |
1649 | int trailer_len = 0; |
1650 | int tos; | |
1651 | int family = policy->selector.family; | |
9bb182a7 YH |
1652 | xfrm_address_t saddr, daddr; |
1653 | ||
1654 | xfrm_flowi_addr_get(fl, &saddr, &daddr, family); | |
25ee3286 HX |
1655 | |
1656 | tos = xfrm_get_tos(fl, family); | |
1657 | err = tos; | |
1658 | if (tos < 0) | |
1659 | goto put_states; | |
1660 | ||
1661 | dst_hold(dst); | |
1662 | ||
1663 | for (; i < nx; i++) { | |
d7c7544c | 1664 | struct xfrm_dst *xdst = xfrm_alloc_dst(net, family); |
25ee3286 HX |
1665 | struct dst_entry *dst1 = &xdst->u.dst; |
1666 | ||
1667 | err = PTR_ERR(xdst); | |
1668 | if (IS_ERR(xdst)) { | |
1669 | dst_release(dst); | |
1670 | goto put_states; | |
1671 | } | |
1672 | ||
43a4dea4 SK |
1673 | if (xfrm[i]->sel.family == AF_UNSPEC) { |
1674 | inner_mode = xfrm_ip2inner_mode(xfrm[i], | |
1675 | xfrm_af2proto(family)); | |
1676 | if (!inner_mode) { | |
1677 | err = -EAFNOSUPPORT; | |
1678 | dst_release(dst); | |
1679 | goto put_states; | |
1680 | } | |
1681 | } else | |
1682 | inner_mode = xfrm[i]->inner_mode; | |
1683 | ||
25ee3286 HX |
1684 | if (!dst_prev) |
1685 | dst0 = dst1; | |
1686 | else { | |
1687 | dst_prev->child = dst_clone(dst1); | |
1688 | dst1->flags |= DST_NOHASH; | |
1689 | } | |
1690 | ||
1691 | xdst->route = dst; | |
defb3519 | 1692 | dst_copy_metrics(dst1, dst); |
25ee3286 HX |
1693 | |
1694 | if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) { | |
1695 | family = xfrm[i]->props.family; | |
9bb182a7 YH |
1696 | dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr, |
1697 | family); | |
25ee3286 HX |
1698 | err = PTR_ERR(dst); |
1699 | if (IS_ERR(dst)) | |
1700 | goto put_states; | |
1701 | } else | |
1702 | dst_hold(dst); | |
1703 | ||
1704 | dst1->xfrm = xfrm[i]; | |
80c802f3 | 1705 | xdst->xfrm_genid = xfrm[i]->genid; |
25ee3286 | 1706 | |
f5b0a874 | 1707 | dst1->obsolete = DST_OBSOLETE_FORCE_CHK; |
25ee3286 HX |
1708 | dst1->flags |= DST_HOST; |
1709 | dst1->lastuse = now; | |
1710 | ||
1711 | dst1->input = dst_discard; | |
43a4dea4 | 1712 | dst1->output = inner_mode->afinfo->output; |
25ee3286 HX |
1713 | |
1714 | dst1->next = dst_prev; | |
1715 | dst_prev = dst1; | |
1716 | ||
1717 | header_len += xfrm[i]->props.header_len; | |
a1b05140 MN |
1718 | if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT) |
1719 | nfheader_len += xfrm[i]->props.header_len; | |
25ee3286 HX |
1720 | trailer_len += xfrm[i]->props.trailer_len; |
1721 | } | |
1722 | ||
1723 | dst_prev->child = dst; | |
1724 | dst0->path = dst; | |
1725 | ||
1726 | err = -ENODEV; | |
1727 | dev = dst->dev; | |
1728 | if (!dev) | |
1729 | goto free_dst; | |
1730 | ||
a1b05140 | 1731 | xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len); |
25ee3286 HX |
1732 | xfrm_init_pmtu(dst_prev); |
1733 | ||
1734 | for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) { | |
1735 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev; | |
1736 | ||
87c1e12b | 1737 | err = xfrm_fill_dst(xdst, dev, fl); |
25ee3286 HX |
1738 | if (err) |
1739 | goto free_dst; | |
1740 | ||
1741 | dst_prev->header_len = header_len; | |
1742 | dst_prev->trailer_len = trailer_len; | |
1743 | header_len -= xdst->u.dst.xfrm->props.header_len; | |
1744 | trailer_len -= xdst->u.dst.xfrm->props.trailer_len; | |
1745 | } | |
1746 | ||
1747 | out: | |
1748 | return dst0; | |
1749 | ||
1750 | put_states: | |
1751 | for (; i < nx; i++) | |
1752 | xfrm_state_put(xfrm[i]); | |
1753 | free_dst: | |
1754 | if (dst0) | |
1755 | dst_free(dst0); | |
1756 | dst0 = ERR_PTR(err); | |
1757 | goto out; | |
1758 | } | |
1759 | ||
da7c224b | 1760 | #ifdef CONFIG_XFRM_SUB_POLICY |
be7928d2 | 1761 | static int xfrm_dst_alloc_copy(void **target, const void *src, int size) |
157bfc25 MN |
1762 | { |
1763 | if (!*target) { | |
1764 | *target = kmalloc(size, GFP_ATOMIC); | |
1765 | if (!*target) | |
1766 | return -ENOMEM; | |
1767 | } | |
be7928d2 | 1768 | |
157bfc25 MN |
1769 | memcpy(*target, src, size); |
1770 | return 0; | |
1771 | } | |
da7c224b | 1772 | #endif |
157bfc25 | 1773 | |
be7928d2 DB |
1774 | static int xfrm_dst_update_parent(struct dst_entry *dst, |
1775 | const struct xfrm_selector *sel) | |
157bfc25 MN |
1776 | { |
1777 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1778 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1779 | return xfrm_dst_alloc_copy((void **)&(xdst->partner), | |
1780 | sel, sizeof(*sel)); | |
1781 | #else | |
1782 | return 0; | |
1783 | #endif | |
1784 | } | |
1785 | ||
be7928d2 DB |
1786 | static int xfrm_dst_update_origin(struct dst_entry *dst, |
1787 | const struct flowi *fl) | |
157bfc25 MN |
1788 | { |
1789 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1790 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1791 | return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl)); | |
1792 | #else | |
1793 | return 0; | |
1794 | #endif | |
1795 | } | |
1da177e4 | 1796 | |
73ff93cd | 1797 | static int xfrm_expand_policies(const struct flowi *fl, u16 family, |
80c802f3 TT |
1798 | struct xfrm_policy **pols, |
1799 | int *num_pols, int *num_xfrms) | |
1800 | { | |
1801 | int i; | |
1802 | ||
1803 | if (*num_pols == 0 || !pols[0]) { | |
1804 | *num_pols = 0; | |
1805 | *num_xfrms = 0; | |
1806 | return 0; | |
1807 | } | |
1808 | if (IS_ERR(pols[0])) | |
1809 | return PTR_ERR(pols[0]); | |
1810 | ||
1811 | *num_xfrms = pols[0]->xfrm_nr; | |
1812 | ||
1813 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1814 | if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW && | |
1815 | pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1816 | pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]), | |
1817 | XFRM_POLICY_TYPE_MAIN, | |
1818 | fl, family, | |
1819 | XFRM_POLICY_OUT); | |
1820 | if (pols[1]) { | |
1821 | if (IS_ERR(pols[1])) { | |
1822 | xfrm_pols_put(pols, *num_pols); | |
1823 | return PTR_ERR(pols[1]); | |
1824 | } | |
02d0892f | 1825 | (*num_pols)++; |
80c802f3 TT |
1826 | (*num_xfrms) += pols[1]->xfrm_nr; |
1827 | } | |
1828 | } | |
1829 | #endif | |
1830 | for (i = 0; i < *num_pols; i++) { | |
1831 | if (pols[i]->action != XFRM_POLICY_ALLOW) { | |
1832 | *num_xfrms = -1; | |
1833 | break; | |
1834 | } | |
1835 | } | |
1836 | ||
1837 | return 0; | |
1838 | ||
1839 | } | |
1840 | ||
1841 | static struct xfrm_dst * | |
1842 | xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols, | |
4ca2e685 | 1843 | const struct flowi *fl, u16 family, |
80c802f3 TT |
1844 | struct dst_entry *dst_orig) |
1845 | { | |
1846 | struct net *net = xp_net(pols[0]); | |
1847 | struct xfrm_state *xfrm[XFRM_MAX_DEPTH]; | |
1848 | struct dst_entry *dst; | |
1849 | struct xfrm_dst *xdst; | |
1850 | int err; | |
1851 | ||
1852 | /* Try to instantiate a bundle */ | |
1853 | err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family); | |
d809ec89 TT |
1854 | if (err <= 0) { |
1855 | if (err != 0 && err != -EAGAIN) | |
80c802f3 TT |
1856 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); |
1857 | return ERR_PTR(err); | |
1858 | } | |
1859 | ||
1860 | dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig); | |
1861 | if (IS_ERR(dst)) { | |
1862 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR); | |
1863 | return ERR_CAST(dst); | |
1864 | } | |
1865 | ||
1866 | xdst = (struct xfrm_dst *)dst; | |
1867 | xdst->num_xfrms = err; | |
1868 | if (num_pols > 1) | |
1869 | err = xfrm_dst_update_parent(dst, &pols[1]->selector); | |
1870 | else | |
1871 | err = xfrm_dst_update_origin(dst, fl); | |
1872 | if (unlikely(err)) { | |
1873 | dst_free(dst); | |
1874 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR); | |
1875 | return ERR_PTR(err); | |
1876 | } | |
1877 | ||
1878 | xdst->num_pols = num_pols; | |
3e94c2dc | 1879 | memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols); |
80c802f3 TT |
1880 | xdst->policy_genid = atomic_read(&pols[0]->genid); |
1881 | ||
1882 | return xdst; | |
1883 | } | |
1884 | ||
a0073fe1 SK |
1885 | static void xfrm_policy_queue_process(unsigned long arg) |
1886 | { | |
a0073fe1 SK |
1887 | struct sk_buff *skb; |
1888 | struct sock *sk; | |
1889 | struct dst_entry *dst; | |
a0073fe1 SK |
1890 | struct xfrm_policy *pol = (struct xfrm_policy *)arg; |
1891 | struct xfrm_policy_queue *pq = &pol->polq; | |
1892 | struct flowi fl; | |
1893 | struct sk_buff_head list; | |
1894 | ||
1895 | spin_lock(&pq->hold_queue.lock); | |
1896 | skb = skb_peek(&pq->hold_queue); | |
2bb53e25 SK |
1897 | if (!skb) { |
1898 | spin_unlock(&pq->hold_queue.lock); | |
1899 | goto out; | |
1900 | } | |
a0073fe1 SK |
1901 | dst = skb_dst(skb); |
1902 | sk = skb->sk; | |
1903 | xfrm_decode_session(skb, &fl, dst->ops->family); | |
1904 | spin_unlock(&pq->hold_queue.lock); | |
1905 | ||
1906 | dst_hold(dst->path); | |
1907 | dst = xfrm_lookup(xp_net(pol), dst->path, &fl, | |
1908 | sk, 0); | |
1909 | if (IS_ERR(dst)) | |
1910 | goto purge_queue; | |
1911 | ||
1912 | if (dst->flags & DST_XFRM_QUEUE) { | |
1913 | dst_release(dst); | |
1914 | ||
1915 | if (pq->timeout >= XFRM_QUEUE_TMO_MAX) | |
1916 | goto purge_queue; | |
1917 | ||
1918 | pq->timeout = pq->timeout << 1; | |
e7d8f6cb SK |
1919 | if (!mod_timer(&pq->hold_timer, jiffies + pq->timeout)) |
1920 | xfrm_pol_hold(pol); | |
1921 | goto out; | |
a0073fe1 SK |
1922 | } |
1923 | ||
1924 | dst_release(dst); | |
1925 | ||
1926 | __skb_queue_head_init(&list); | |
1927 | ||
1928 | spin_lock(&pq->hold_queue.lock); | |
1929 | pq->timeout = 0; | |
1930 | skb_queue_splice_init(&pq->hold_queue, &list); | |
1931 | spin_unlock(&pq->hold_queue.lock); | |
1932 | ||
1933 | while (!skb_queue_empty(&list)) { | |
1934 | skb = __skb_dequeue(&list); | |
1935 | ||
1936 | xfrm_decode_session(skb, &fl, skb_dst(skb)->ops->family); | |
1937 | dst_hold(skb_dst(skb)->path); | |
1938 | dst = xfrm_lookup(xp_net(pol), skb_dst(skb)->path, | |
1939 | &fl, skb->sk, 0); | |
1940 | if (IS_ERR(dst)) { | |
a0073fe1 SK |
1941 | kfree_skb(skb); |
1942 | continue; | |
1943 | } | |
1944 | ||
1945 | nf_reset(skb); | |
1946 | skb_dst_drop(skb); | |
1947 | skb_dst_set(skb, dst); | |
1948 | ||
5c1e9f2c | 1949 | dst_output(skb); |
a0073fe1 SK |
1950 | } |
1951 | ||
e7d8f6cb SK |
1952 | out: |
1953 | xfrm_pol_put(pol); | |
a0073fe1 SK |
1954 | return; |
1955 | ||
1956 | purge_queue: | |
1957 | pq->timeout = 0; | |
1958 | xfrm_queue_purge(&pq->hold_queue); | |
e7d8f6cb | 1959 | xfrm_pol_put(pol); |
a0073fe1 SK |
1960 | } |
1961 | ||
aad88724 | 1962 | static int xdst_queue_output(struct sock *sk, struct sk_buff *skb) |
a0073fe1 SK |
1963 | { |
1964 | unsigned long sched_next; | |
1965 | struct dst_entry *dst = skb_dst(skb); | |
1966 | struct xfrm_dst *xdst = (struct xfrm_dst *) dst; | |
e7d8f6cb SK |
1967 | struct xfrm_policy *pol = xdst->pols[0]; |
1968 | struct xfrm_policy_queue *pq = &pol->polq; | |
4d53eff4 | 1969 | |
39bb5e62 | 1970 | if (unlikely(skb_fclone_busy(sk, skb))) { |
4d53eff4 SK |
1971 | kfree_skb(skb); |
1972 | return 0; | |
1973 | } | |
a0073fe1 SK |
1974 | |
1975 | if (pq->hold_queue.qlen > XFRM_MAX_QUEUE_LEN) { | |
1976 | kfree_skb(skb); | |
1977 | return -EAGAIN; | |
1978 | } | |
1979 | ||
1980 | skb_dst_force(skb); | |
a0073fe1 SK |
1981 | |
1982 | spin_lock_bh(&pq->hold_queue.lock); | |
1983 | ||
1984 | if (!pq->timeout) | |
1985 | pq->timeout = XFRM_QUEUE_TMO_MIN; | |
1986 | ||
1987 | sched_next = jiffies + pq->timeout; | |
1988 | ||
1989 | if (del_timer(&pq->hold_timer)) { | |
1990 | if (time_before(pq->hold_timer.expires, sched_next)) | |
1991 | sched_next = pq->hold_timer.expires; | |
e7d8f6cb | 1992 | xfrm_pol_put(pol); |
a0073fe1 SK |
1993 | } |
1994 | ||
1995 | __skb_queue_tail(&pq->hold_queue, skb); | |
e7d8f6cb SK |
1996 | if (!mod_timer(&pq->hold_timer, sched_next)) |
1997 | xfrm_pol_hold(pol); | |
a0073fe1 SK |
1998 | |
1999 | spin_unlock_bh(&pq->hold_queue.lock); | |
2000 | ||
2001 | return 0; | |
2002 | } | |
2003 | ||
2004 | static struct xfrm_dst *xfrm_create_dummy_bundle(struct net *net, | |
b8c203b2 | 2005 | struct xfrm_flo *xflo, |
a0073fe1 SK |
2006 | const struct flowi *fl, |
2007 | int num_xfrms, | |
2008 | u16 family) | |
2009 | { | |
2010 | int err; | |
2011 | struct net_device *dev; | |
b8c203b2 | 2012 | struct dst_entry *dst; |
a0073fe1 SK |
2013 | struct dst_entry *dst1; |
2014 | struct xfrm_dst *xdst; | |
2015 | ||
2016 | xdst = xfrm_alloc_dst(net, family); | |
2017 | if (IS_ERR(xdst)) | |
2018 | return xdst; | |
2019 | ||
b8c203b2 SK |
2020 | if (!(xflo->flags & XFRM_LOOKUP_QUEUE) || |
2021 | net->xfrm.sysctl_larval_drop || | |
2022 | num_xfrms <= 0) | |
a0073fe1 SK |
2023 | return xdst; |
2024 | ||
b8c203b2 | 2025 | dst = xflo->dst_orig; |
a0073fe1 SK |
2026 | dst1 = &xdst->u.dst; |
2027 | dst_hold(dst); | |
2028 | xdst->route = dst; | |
2029 | ||
2030 | dst_copy_metrics(dst1, dst); | |
2031 | ||
2032 | dst1->obsolete = DST_OBSOLETE_FORCE_CHK; | |
2033 | dst1->flags |= DST_HOST | DST_XFRM_QUEUE; | |
2034 | dst1->lastuse = jiffies; | |
2035 | ||
2036 | dst1->input = dst_discard; | |
2037 | dst1->output = xdst_queue_output; | |
2038 | ||
2039 | dst_hold(dst); | |
2040 | dst1->child = dst; | |
2041 | dst1->path = dst; | |
2042 | ||
2043 | xfrm_init_path((struct xfrm_dst *)dst1, dst, 0); | |
2044 | ||
2045 | err = -ENODEV; | |
2046 | dev = dst->dev; | |
2047 | if (!dev) | |
2048 | goto free_dst; | |
2049 | ||
2050 | err = xfrm_fill_dst(xdst, dev, fl); | |
2051 | if (err) | |
2052 | goto free_dst; | |
2053 | ||
2054 | out: | |
2055 | return xdst; | |
2056 | ||
2057 | free_dst: | |
2058 | dst_release(dst1); | |
2059 | xdst = ERR_PTR(err); | |
2060 | goto out; | |
2061 | } | |
2062 | ||
80c802f3 | 2063 | static struct flow_cache_object * |
dee9f4bc | 2064 | xfrm_bundle_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir, |
80c802f3 TT |
2065 | struct flow_cache_object *oldflo, void *ctx) |
2066 | { | |
b8c203b2 | 2067 | struct xfrm_flo *xflo = (struct xfrm_flo *)ctx; |
80c802f3 TT |
2068 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
2069 | struct xfrm_dst *xdst, *new_xdst; | |
2070 | int num_pols = 0, num_xfrms = 0, i, err, pol_dead; | |
2071 | ||
2072 | /* Check if the policies from old bundle are usable */ | |
2073 | xdst = NULL; | |
2074 | if (oldflo) { | |
2075 | xdst = container_of(oldflo, struct xfrm_dst, flo); | |
2076 | num_pols = xdst->num_pols; | |
2077 | num_xfrms = xdst->num_xfrms; | |
2078 | pol_dead = 0; | |
2079 | for (i = 0; i < num_pols; i++) { | |
2080 | pols[i] = xdst->pols[i]; | |
2081 | pol_dead |= pols[i]->walk.dead; | |
2082 | } | |
2083 | if (pol_dead) { | |
2084 | dst_free(&xdst->u.dst); | |
2085 | xdst = NULL; | |
2086 | num_pols = 0; | |
2087 | num_xfrms = 0; | |
2088 | oldflo = NULL; | |
2089 | } | |
2090 | } | |
2091 | ||
2092 | /* Resolve policies to use if we couldn't get them from | |
2093 | * previous cache entry */ | |
2094 | if (xdst == NULL) { | |
2095 | num_pols = 1; | |
b5fb82c4 BZ |
2096 | pols[0] = __xfrm_policy_lookup(net, fl, family, |
2097 | flow_to_policy_dir(dir)); | |
80c802f3 TT |
2098 | err = xfrm_expand_policies(fl, family, pols, |
2099 | &num_pols, &num_xfrms); | |
2100 | if (err < 0) | |
2101 | goto inc_error; | |
2102 | if (num_pols == 0) | |
2103 | return NULL; | |
2104 | if (num_xfrms <= 0) | |
2105 | goto make_dummy_bundle; | |
2106 | } | |
2107 | ||
b8c203b2 SK |
2108 | new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family, |
2109 | xflo->dst_orig); | |
80c802f3 TT |
2110 | if (IS_ERR(new_xdst)) { |
2111 | err = PTR_ERR(new_xdst); | |
2112 | if (err != -EAGAIN) | |
2113 | goto error; | |
2114 | if (oldflo == NULL) | |
2115 | goto make_dummy_bundle; | |
2116 | dst_hold(&xdst->u.dst); | |
2117 | return oldflo; | |
d809ec89 TT |
2118 | } else if (new_xdst == NULL) { |
2119 | num_xfrms = 0; | |
2120 | if (oldflo == NULL) | |
2121 | goto make_dummy_bundle; | |
2122 | xdst->num_xfrms = 0; | |
2123 | dst_hold(&xdst->u.dst); | |
2124 | return oldflo; | |
80c802f3 TT |
2125 | } |
2126 | ||
2127 | /* Kill the previous bundle */ | |
2128 | if (xdst) { | |
2129 | /* The policies were stolen for newly generated bundle */ | |
2130 | xdst->num_pols = 0; | |
2131 | dst_free(&xdst->u.dst); | |
2132 | } | |
2133 | ||
2134 | /* Flow cache does not have reference, it dst_free()'s, | |
2135 | * but we do need to return one reference for original caller */ | |
2136 | dst_hold(&new_xdst->u.dst); | |
2137 | return &new_xdst->flo; | |
2138 | ||
2139 | make_dummy_bundle: | |
2140 | /* We found policies, but there's no bundles to instantiate: | |
2141 | * either because the policy blocks, has no transformations or | |
2142 | * we could not build template (no xfrm_states).*/ | |
b8c203b2 | 2143 | xdst = xfrm_create_dummy_bundle(net, xflo, fl, num_xfrms, family); |
80c802f3 TT |
2144 | if (IS_ERR(xdst)) { |
2145 | xfrm_pols_put(pols, num_pols); | |
2146 | return ERR_CAST(xdst); | |
2147 | } | |
2148 | xdst->num_pols = num_pols; | |
2149 | xdst->num_xfrms = num_xfrms; | |
3e94c2dc | 2150 | memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols); |
80c802f3 TT |
2151 | |
2152 | dst_hold(&xdst->u.dst); | |
2153 | return &xdst->flo; | |
2154 | ||
2155 | inc_error: | |
2156 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); | |
2157 | error: | |
2158 | if (xdst != NULL) | |
2159 | dst_free(&xdst->u.dst); | |
2160 | else | |
2161 | xfrm_pols_put(pols, num_pols); | |
2162 | return ERR_PTR(err); | |
2163 | } | |
1da177e4 | 2164 | |
2774c131 DM |
2165 | static struct dst_entry *make_blackhole(struct net *net, u16 family, |
2166 | struct dst_entry *dst_orig) | |
2167 | { | |
2168 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
2169 | struct dst_entry *ret; | |
2170 | ||
2171 | if (!afinfo) { | |
2172 | dst_release(dst_orig); | |
433a1954 | 2173 | return ERR_PTR(-EINVAL); |
2774c131 DM |
2174 | } else { |
2175 | ret = afinfo->blackhole_route(net, dst_orig); | |
2176 | } | |
2177 | xfrm_policy_put_afinfo(afinfo); | |
2178 | ||
2179 | return ret; | |
2180 | } | |
2181 | ||
1da177e4 LT |
2182 | /* Main function: finds/creates a bundle for given flow. |
2183 | * | |
2184 | * At the moment we eat a raw IP route. Mostly to speed up lookups | |
2185 | * on interfaces with disabled IPsec. | |
2186 | */ | |
452edd59 DM |
2187 | struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig, |
2188 | const struct flowi *fl, | |
2189 | struct sock *sk, int flags) | |
1da177e4 | 2190 | { |
4e81bb83 | 2191 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
80c802f3 TT |
2192 | struct flow_cache_object *flo; |
2193 | struct xfrm_dst *xdst; | |
452edd59 | 2194 | struct dst_entry *dst, *route; |
80c802f3 | 2195 | u16 family = dst_orig->ops->family; |
df71837d | 2196 | u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT); |
4b021628 | 2197 | int i, err, num_pols, num_xfrms = 0, drop_pols = 0; |
e0d1caa7 | 2198 | |
80c802f3 TT |
2199 | dst = NULL; |
2200 | xdst = NULL; | |
2201 | route = NULL; | |
4e81bb83 | 2202 | |
f7944fb1 | 2203 | if (sk && sk->sk_policy[XFRM_POLICY_OUT]) { |
80c802f3 TT |
2204 | num_pols = 1; |
2205 | pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl); | |
2206 | err = xfrm_expand_policies(fl, family, pols, | |
2207 | &num_pols, &num_xfrms); | |
2208 | if (err < 0) | |
75b8c133 | 2209 | goto dropdst; |
80c802f3 TT |
2210 | |
2211 | if (num_pols) { | |
2212 | if (num_xfrms <= 0) { | |
2213 | drop_pols = num_pols; | |
2214 | goto no_transform; | |
2215 | } | |
2216 | ||
2217 | xdst = xfrm_resolve_and_create_bundle( | |
2218 | pols, num_pols, fl, | |
2219 | family, dst_orig); | |
2220 | if (IS_ERR(xdst)) { | |
2221 | xfrm_pols_put(pols, num_pols); | |
2222 | err = PTR_ERR(xdst); | |
2223 | goto dropdst; | |
d809ec89 TT |
2224 | } else if (xdst == NULL) { |
2225 | num_xfrms = 0; | |
2226 | drop_pols = num_pols; | |
2227 | goto no_transform; | |
80c802f3 TT |
2228 | } |
2229 | ||
b7eea454 SK |
2230 | dst_hold(&xdst->u.dst); |
2231 | xdst->u.dst.flags |= DST_NOCACHE; | |
80c802f3 | 2232 | route = xdst->route; |
0aa64774 | 2233 | } |
3bccfbc7 | 2234 | } |
1da177e4 | 2235 | |
80c802f3 | 2236 | if (xdst == NULL) { |
b8c203b2 SK |
2237 | struct xfrm_flo xflo; |
2238 | ||
2239 | xflo.dst_orig = dst_orig; | |
2240 | xflo.flags = flags; | |
2241 | ||
1da177e4 | 2242 | /* To accelerate a bit... */ |
2518c7c2 | 2243 | if ((dst_orig->flags & DST_NOXFRM) || |
52479b62 | 2244 | !net->xfrm.policy_count[XFRM_POLICY_OUT]) |
8b7817f3 | 2245 | goto nopol; |
1da177e4 | 2246 | |
80c802f3 | 2247 | flo = flow_cache_lookup(net, fl, family, dir, |
b8c203b2 | 2248 | xfrm_bundle_lookup, &xflo); |
80c802f3 TT |
2249 | if (flo == NULL) |
2250 | goto nopol; | |
fe1a5f03 | 2251 | if (IS_ERR(flo)) { |
80c802f3 | 2252 | err = PTR_ERR(flo); |
75b8c133 | 2253 | goto dropdst; |
d66e37a9 | 2254 | } |
80c802f3 TT |
2255 | xdst = container_of(flo, struct xfrm_dst, flo); |
2256 | ||
2257 | num_pols = xdst->num_pols; | |
2258 | num_xfrms = xdst->num_xfrms; | |
3e94c2dc | 2259 | memcpy(pols, xdst->pols, sizeof(struct xfrm_policy *) * num_pols); |
80c802f3 TT |
2260 | route = xdst->route; |
2261 | } | |
2262 | ||
2263 | dst = &xdst->u.dst; | |
2264 | if (route == NULL && num_xfrms > 0) { | |
2265 | /* The only case when xfrm_bundle_lookup() returns a | |
2266 | * bundle with null route, is when the template could | |
2267 | * not be resolved. It means policies are there, but | |
2268 | * bundle could not be created, since we don't yet | |
2269 | * have the xfrm_state's. We need to wait for KM to | |
2270 | * negotiate new SA's or bail out with error.*/ | |
2271 | if (net->xfrm.sysctl_larval_drop) { | |
80c802f3 | 2272 | dst_release(dst); |
a1aa3483 | 2273 | xfrm_pols_put(pols, drop_pols); |
80c802f3 | 2274 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); |
2774c131 | 2275 | |
f92ee619 | 2276 | return ERR_PTR(-EREMOTE); |
80c802f3 | 2277 | } |
80c802f3 | 2278 | |
5b8ef341 | 2279 | err = -EAGAIN; |
80c802f3 TT |
2280 | |
2281 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); | |
2282 | goto error; | |
1da177e4 LT |
2283 | } |
2284 | ||
80c802f3 TT |
2285 | no_transform: |
2286 | if (num_pols == 0) | |
8b7817f3 | 2287 | goto nopol; |
1da177e4 | 2288 | |
80c802f3 TT |
2289 | if ((flags & XFRM_LOOKUP_ICMP) && |
2290 | !(pols[0]->flags & XFRM_POLICY_ICMP)) { | |
2291 | err = -ENOENT; | |
8b7817f3 | 2292 | goto error; |
80c802f3 | 2293 | } |
8b7817f3 | 2294 | |
80c802f3 TT |
2295 | for (i = 0; i < num_pols; i++) |
2296 | pols[i]->curlft.use_time = get_seconds(); | |
8b7817f3 | 2297 | |
80c802f3 | 2298 | if (num_xfrms < 0) { |
1da177e4 | 2299 | /* Prohibit the flow */ |
59c9940e | 2300 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK); |
e104411b PM |
2301 | err = -EPERM; |
2302 | goto error; | |
80c802f3 TT |
2303 | } else if (num_xfrms > 0) { |
2304 | /* Flow transformed */ | |
80c802f3 TT |
2305 | dst_release(dst_orig); |
2306 | } else { | |
2307 | /* Flow passes untransformed */ | |
2308 | dst_release(dst); | |
452edd59 | 2309 | dst = dst_orig; |
1da177e4 | 2310 | } |
80c802f3 TT |
2311 | ok: |
2312 | xfrm_pols_put(pols, drop_pols); | |
0c183379 G |
2313 | if (dst && dst->xfrm && |
2314 | dst->xfrm->props.mode == XFRM_MODE_TUNNEL) | |
2315 | dst->flags |= DST_XFRM_TUNNEL; | |
452edd59 | 2316 | return dst; |
1da177e4 | 2317 | |
80c802f3 | 2318 | nopol: |
452edd59 DM |
2319 | if (!(flags & XFRM_LOOKUP_ICMP)) { |
2320 | dst = dst_orig; | |
80c802f3 | 2321 | goto ok; |
452edd59 | 2322 | } |
80c802f3 | 2323 | err = -ENOENT; |
1da177e4 | 2324 | error: |
80c802f3 | 2325 | dst_release(dst); |
75b8c133 HX |
2326 | dropdst: |
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 SK |
2340 | struct dst_entry *dst = xfrm_lookup(net, dst_orig, fl, sk, |
2341 | flags | XFRM_LOOKUP_QUEUE); | |
f92ee619 SK |
2342 | |
2343 | if (IS_ERR(dst) && PTR_ERR(dst) == -EREMOTE) | |
2344 | return make_blackhole(net, dst_orig->ops->family, dst_orig); | |
2345 | ||
2346 | return dst; | |
2347 | } | |
2348 | EXPORT_SYMBOL(xfrm_lookup_route); | |
2349 | ||
df0ba92a | 2350 | static inline int |
8f029de2 | 2351 | xfrm_secpath_reject(int idx, struct sk_buff *skb, const struct flowi *fl) |
df0ba92a MN |
2352 | { |
2353 | struct xfrm_state *x; | |
df0ba92a MN |
2354 | |
2355 | if (!skb->sp || idx < 0 || idx >= skb->sp->len) | |
2356 | return 0; | |
2357 | x = skb->sp->xvec[idx]; | |
2358 | if (!x->type->reject) | |
2359 | return 0; | |
1ecafede | 2360 | return x->type->reject(x, skb, fl); |
df0ba92a MN |
2361 | } |
2362 | ||
1da177e4 LT |
2363 | /* When skb is transformed back to its "native" form, we have to |
2364 | * check policy restrictions. At the moment we make this in maximally | |
2365 | * stupid way. Shame on me. :-) Of course, connected sockets must | |
2366 | * have policy cached at them. | |
2367 | */ | |
2368 | ||
2369 | static inline int | |
7db454b9 | 2370 | xfrm_state_ok(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, |
1da177e4 LT |
2371 | unsigned short family) |
2372 | { | |
2373 | if (xfrm_state_kern(x)) | |
928ba416 | 2374 | return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family); |
1da177e4 LT |
2375 | return x->id.proto == tmpl->id.proto && |
2376 | (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && | |
2377 | (x->props.reqid == tmpl->reqid || !tmpl->reqid) && | |
2378 | x->props.mode == tmpl->mode && | |
c5d18e98 | 2379 | (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) || |
f3bd4840 | 2380 | !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) && |
7e49e6de MN |
2381 | !(x->props.mode != XFRM_MODE_TRANSPORT && |
2382 | xfrm_state_addr_cmp(tmpl, x, family)); | |
1da177e4 LT |
2383 | } |
2384 | ||
df0ba92a MN |
2385 | /* |
2386 | * 0 or more than 0 is returned when validation is succeeded (either bypass | |
2387 | * because of optional transport mode, or next index of the mathced secpath | |
2388 | * state with the template. | |
2389 | * -1 is returned when no matching template is found. | |
2390 | * Otherwise "-2 - errored_index" is returned. | |
2391 | */ | |
1da177e4 | 2392 | static inline int |
22cccb7e | 2393 | xfrm_policy_ok(const struct xfrm_tmpl *tmpl, const struct sec_path *sp, int start, |
1da177e4 LT |
2394 | unsigned short family) |
2395 | { | |
2396 | int idx = start; | |
2397 | ||
2398 | if (tmpl->optional) { | |
7e49e6de | 2399 | if (tmpl->mode == XFRM_MODE_TRANSPORT) |
1da177e4 LT |
2400 | return start; |
2401 | } else | |
2402 | start = -1; | |
2403 | for (; idx < sp->len; idx++) { | |
dbe5b4aa | 2404 | if (xfrm_state_ok(tmpl, sp->xvec[idx], family)) |
1da177e4 | 2405 | return ++idx; |
df0ba92a MN |
2406 | if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) { |
2407 | if (start == -1) | |
2408 | start = -2-idx; | |
1da177e4 | 2409 | break; |
df0ba92a | 2410 | } |
1da177e4 LT |
2411 | } |
2412 | return start; | |
2413 | } | |
2414 | ||
d5422efe HX |
2415 | int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, |
2416 | unsigned int family, int reverse) | |
1da177e4 LT |
2417 | { |
2418 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
e0d1caa7 | 2419 | int err; |
1da177e4 LT |
2420 | |
2421 | if (unlikely(afinfo == NULL)) | |
2422 | return -EAFNOSUPPORT; | |
2423 | ||
d5422efe | 2424 | afinfo->decode_session(skb, fl, reverse); |
1d28f42c | 2425 | err = security_xfrm_decode_session(skb, &fl->flowi_secid); |
1da177e4 | 2426 | xfrm_policy_put_afinfo(afinfo); |
e0d1caa7 | 2427 | return err; |
1da177e4 | 2428 | } |
d5422efe | 2429 | EXPORT_SYMBOL(__xfrm_decode_session); |
1da177e4 | 2430 | |
9a7386ec | 2431 | static inline int secpath_has_nontransport(const struct sec_path *sp, int k, int *idxp) |
1da177e4 LT |
2432 | { |
2433 | for (; k < sp->len; k++) { | |
df0ba92a | 2434 | if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) { |
d1d9facf | 2435 | *idxp = k; |
1da177e4 | 2436 | return 1; |
df0ba92a | 2437 | } |
1da177e4 LT |
2438 | } |
2439 | ||
2440 | return 0; | |
2441 | } | |
2442 | ||
a716c119 | 2443 | int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, |
1da177e4 LT |
2444 | unsigned short family) |
2445 | { | |
f6e1e25d | 2446 | struct net *net = dev_net(skb->dev); |
1da177e4 | 2447 | struct xfrm_policy *pol; |
4e81bb83 MN |
2448 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
2449 | int npols = 0; | |
2450 | int xfrm_nr; | |
2451 | int pi; | |
d5422efe | 2452 | int reverse; |
1da177e4 | 2453 | struct flowi fl; |
d5422efe | 2454 | u8 fl_dir; |
df0ba92a | 2455 | int xerr_idx = -1; |
1da177e4 | 2456 | |
d5422efe HX |
2457 | reverse = dir & ~XFRM_POLICY_MASK; |
2458 | dir &= XFRM_POLICY_MASK; | |
2459 | fl_dir = policy_to_flow_dir(dir); | |
2460 | ||
0aa64774 | 2461 | if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) { |
59c9940e | 2462 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); |
1da177e4 | 2463 | return 0; |
0aa64774 MN |
2464 | } |
2465 | ||
eb9c7ebe | 2466 | nf_nat_decode_session(skb, &fl, family); |
1da177e4 LT |
2467 | |
2468 | /* First, check used SA against their selectors. */ | |
2469 | if (skb->sp) { | |
2470 | int i; | |
2471 | ||
9b7a787d | 2472 | for (i = skb->sp->len-1; i >= 0; i--) { |
dbe5b4aa | 2473 | struct xfrm_state *x = skb->sp->xvec[i]; |
0aa64774 | 2474 | if (!xfrm_selector_match(&x->sel, &fl, family)) { |
59c9940e | 2475 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH); |
1da177e4 | 2476 | return 0; |
0aa64774 | 2477 | } |
1da177e4 LT |
2478 | } |
2479 | } | |
2480 | ||
2481 | pol = NULL; | |
3bccfbc7 | 2482 | if (sk && sk->sk_policy[dir]) { |
e0d1caa7 | 2483 | pol = xfrm_sk_policy_lookup(sk, dir, &fl); |
0aa64774 | 2484 | if (IS_ERR(pol)) { |
59c9940e | 2485 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
3bccfbc7 | 2486 | return 0; |
0aa64774 | 2487 | } |
3bccfbc7 | 2488 | } |
1da177e4 | 2489 | |
fe1a5f03 TT |
2490 | if (!pol) { |
2491 | struct flow_cache_object *flo; | |
2492 | ||
2493 | flo = flow_cache_lookup(net, &fl, family, fl_dir, | |
2494 | xfrm_policy_lookup, NULL); | |
2495 | if (IS_ERR_OR_NULL(flo)) | |
2496 | pol = ERR_CAST(flo); | |
2497 | else | |
2498 | pol = container_of(flo, struct xfrm_policy, flo); | |
2499 | } | |
1da177e4 | 2500 | |
0aa64774 | 2501 | if (IS_ERR(pol)) { |
59c9940e | 2502 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
134b0fc5 | 2503 | return 0; |
0aa64774 | 2504 | } |
134b0fc5 | 2505 | |
df0ba92a | 2506 | if (!pol) { |
d1d9facf | 2507 | if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) { |
df0ba92a | 2508 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
59c9940e | 2509 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS); |
df0ba92a MN |
2510 | return 0; |
2511 | } | |
2512 | return 1; | |
2513 | } | |
1da177e4 | 2514 | |
9d729f72 | 2515 | pol->curlft.use_time = get_seconds(); |
1da177e4 | 2516 | |
4e81bb83 | 2517 | pols[0] = pol; |
02d0892f | 2518 | npols++; |
4e81bb83 MN |
2519 | #ifdef CONFIG_XFRM_SUB_POLICY |
2520 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
f6e1e25d | 2521 | pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, |
4e81bb83 MN |
2522 | &fl, family, |
2523 | XFRM_POLICY_IN); | |
2524 | if (pols[1]) { | |
0aa64774 | 2525 | if (IS_ERR(pols[1])) { |
59c9940e | 2526 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
134b0fc5 | 2527 | return 0; |
0aa64774 | 2528 | } |
9d729f72 | 2529 | pols[1]->curlft.use_time = get_seconds(); |
02d0892f | 2530 | npols++; |
4e81bb83 MN |
2531 | } |
2532 | } | |
2533 | #endif | |
2534 | ||
1da177e4 LT |
2535 | if (pol->action == XFRM_POLICY_ALLOW) { |
2536 | struct sec_path *sp; | |
2537 | static struct sec_path dummy; | |
4e81bb83 | 2538 | struct xfrm_tmpl *tp[XFRM_MAX_DEPTH]; |
41a49cc3 | 2539 | struct xfrm_tmpl *stp[XFRM_MAX_DEPTH]; |
4e81bb83 MN |
2540 | struct xfrm_tmpl **tpp = tp; |
2541 | int ti = 0; | |
1da177e4 LT |
2542 | int i, k; |
2543 | ||
2544 | if ((sp = skb->sp) == NULL) | |
2545 | sp = &dummy; | |
2546 | ||
4e81bb83 MN |
2547 | for (pi = 0; pi < npols; pi++) { |
2548 | if (pols[pi] != pol && | |
0aa64774 | 2549 | pols[pi]->action != XFRM_POLICY_ALLOW) { |
59c9940e | 2550 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); |
4e81bb83 | 2551 | goto reject; |
0aa64774 MN |
2552 | } |
2553 | if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
59c9940e | 2554 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); |
4e81bb83 | 2555 | goto reject_error; |
0aa64774 | 2556 | } |
4e81bb83 MN |
2557 | for (i = 0; i < pols[pi]->xfrm_nr; i++) |
2558 | tpp[ti++] = &pols[pi]->xfrm_vec[i]; | |
2559 | } | |
2560 | xfrm_nr = ti; | |
41a49cc3 | 2561 | if (npols > 1) { |
283bc9f3 | 2562 | xfrm_tmpl_sort(stp, tpp, xfrm_nr, family, net); |
41a49cc3 MN |
2563 | tpp = stp; |
2564 | } | |
4e81bb83 | 2565 | |
1da177e4 LT |
2566 | /* For each tunnel xfrm, find the first matching tmpl. |
2567 | * For each tmpl before that, find corresponding xfrm. | |
2568 | * Order is _important_. Later we will implement | |
2569 | * some barriers, but at the moment barriers | |
2570 | * are implied between each two transformations. | |
2571 | */ | |
4e81bb83 MN |
2572 | for (i = xfrm_nr-1, k = 0; i >= 0; i--) { |
2573 | k = xfrm_policy_ok(tpp[i], sp, k, family); | |
df0ba92a | 2574 | if (k < 0) { |
d1d9facf JM |
2575 | if (k < -1) |
2576 | /* "-2 - errored_index" returned */ | |
2577 | xerr_idx = -(2+k); | |
59c9940e | 2578 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 2579 | goto reject; |
df0ba92a | 2580 | } |
1da177e4 LT |
2581 | } |
2582 | ||
0aa64774 | 2583 | if (secpath_has_nontransport(sp, k, &xerr_idx)) { |
59c9940e | 2584 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 2585 | goto reject; |
0aa64774 | 2586 | } |
1da177e4 | 2587 | |
4e81bb83 | 2588 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
2589 | return 1; |
2590 | } | |
59c9940e | 2591 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); |
1da177e4 LT |
2592 | |
2593 | reject: | |
df0ba92a | 2594 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
4e81bb83 MN |
2595 | reject_error: |
2596 | xfrm_pols_put(pols, npols); | |
1da177e4 LT |
2597 | return 0; |
2598 | } | |
2599 | EXPORT_SYMBOL(__xfrm_policy_check); | |
2600 | ||
2601 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
2602 | { | |
99a66657 | 2603 | struct net *net = dev_net(skb->dev); |
1da177e4 | 2604 | struct flowi fl; |
adf30907 | 2605 | struct dst_entry *dst; |
73137147 | 2606 | int res = 1; |
1da177e4 | 2607 | |
0aa64774 | 2608 | if (xfrm_decode_session(skb, &fl, family) < 0) { |
72032fdb | 2609 | XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR); |
1da177e4 | 2610 | return 0; |
0aa64774 | 2611 | } |
1da177e4 | 2612 | |
fafeeb6c | 2613 | skb_dst_force(skb); |
adf30907 | 2614 | |
b8c203b2 | 2615 | dst = xfrm_lookup(net, skb_dst(skb), &fl, NULL, XFRM_LOOKUP_QUEUE); |
452edd59 | 2616 | if (IS_ERR(dst)) { |
73137147 | 2617 | res = 0; |
452edd59 DM |
2618 | dst = NULL; |
2619 | } | |
adf30907 ED |
2620 | skb_dst_set(skb, dst); |
2621 | return res; | |
1da177e4 LT |
2622 | } |
2623 | EXPORT_SYMBOL(__xfrm_route_forward); | |
2624 | ||
d49c73c7 DM |
2625 | /* Optimize later using cookies and generation ids. */ |
2626 | ||
1da177e4 LT |
2627 | static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) |
2628 | { | |
d49c73c7 | 2629 | /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete |
f5b0a874 DM |
2630 | * to DST_OBSOLETE_FORCE_CHK to force all XFRM destinations to |
2631 | * get validated by dst_ops->check on every use. We do this | |
2632 | * because when a normal route referenced by an XFRM dst is | |
2633 | * obsoleted we do not go looking around for all parent | |
2634 | * referencing XFRM dsts so that we can invalidate them. It | |
2635 | * is just too much work. Instead we make the checks here on | |
2636 | * every use. For example: | |
d49c73c7 DM |
2637 | * |
2638 | * XFRM dst A --> IPv4 dst X | |
2639 | * | |
2640 | * X is the "xdst->route" of A (X is also the "dst->path" of A | |
2641 | * in this example). If X is marked obsolete, "A" will not | |
2642 | * notice. That's what we are validating here via the | |
2643 | * stale_bundle() check. | |
2644 | * | |
2645 | * When a policy's bundle is pruned, we dst_free() the XFRM | |
f5b0a874 DM |
2646 | * dst which causes it's ->obsolete field to be set to |
2647 | * DST_OBSOLETE_DEAD. If an XFRM dst has been pruned like | |
2648 | * this, we want to force a new route lookup. | |
399c180a | 2649 | */ |
d49c73c7 DM |
2650 | if (dst->obsolete < 0 && !stale_bundle(dst)) |
2651 | return dst; | |
2652 | ||
1da177e4 LT |
2653 | return NULL; |
2654 | } | |
2655 | ||
2656 | static int stale_bundle(struct dst_entry *dst) | |
2657 | { | |
12fdb4d3 | 2658 | return !xfrm_bundle_ok((struct xfrm_dst *)dst); |
1da177e4 LT |
2659 | } |
2660 | ||
aabc9761 | 2661 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
1da177e4 | 2662 | { |
1da177e4 | 2663 | while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { |
c346dca1 | 2664 | dst->dev = dev_net(dev)->loopback_dev; |
de3cb747 | 2665 | dev_hold(dst->dev); |
1da177e4 LT |
2666 | dev_put(dev); |
2667 | } | |
2668 | } | |
aabc9761 | 2669 | EXPORT_SYMBOL(xfrm_dst_ifdown); |
1da177e4 LT |
2670 | |
2671 | static void xfrm_link_failure(struct sk_buff *skb) | |
2672 | { | |
2673 | /* Impossible. Such dst must be popped before reaches point of failure. */ | |
1da177e4 LT |
2674 | } |
2675 | ||
2676 | static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) | |
2677 | { | |
2678 | if (dst) { | |
2679 | if (dst->obsolete) { | |
2680 | dst_release(dst); | |
2681 | dst = NULL; | |
2682 | } | |
2683 | } | |
2684 | return dst; | |
2685 | } | |
2686 | ||
e4c17216 | 2687 | void xfrm_garbage_collect(struct net *net) |
c0ed1c14 | 2688 | { |
ca925cf1 | 2689 | flow_cache_flush(net); |
c0ed1c14 | 2690 | } |
e4c17216 | 2691 | EXPORT_SYMBOL(xfrm_garbage_collect); |
c0ed1c14 SK |
2692 | |
2693 | static void xfrm_garbage_collect_deferred(struct net *net) | |
2694 | { | |
ca925cf1 | 2695 | flow_cache_flush_deferred(net); |
c0ed1c14 SK |
2696 | } |
2697 | ||
25ee3286 | 2698 | static void xfrm_init_pmtu(struct dst_entry *dst) |
1da177e4 LT |
2699 | { |
2700 | do { | |
2701 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2702 | u32 pmtu, route_mtu_cached; | |
2703 | ||
2704 | pmtu = dst_mtu(dst->child); | |
2705 | xdst->child_mtu_cached = pmtu; | |
2706 | ||
2707 | pmtu = xfrm_state_mtu(dst->xfrm, pmtu); | |
2708 | ||
2709 | route_mtu_cached = dst_mtu(xdst->route); | |
2710 | xdst->route_mtu_cached = route_mtu_cached; | |
2711 | ||
2712 | if (pmtu > route_mtu_cached) | |
2713 | pmtu = route_mtu_cached; | |
2714 | ||
defb3519 | 2715 | dst_metric_set(dst, RTAX_MTU, pmtu); |
1da177e4 LT |
2716 | } while ((dst = dst->next)); |
2717 | } | |
2718 | ||
1da177e4 LT |
2719 | /* Check that the bundle accepts the flow and its components are |
2720 | * still valid. | |
2721 | */ | |
2722 | ||
12fdb4d3 | 2723 | static int xfrm_bundle_ok(struct xfrm_dst *first) |
1da177e4 LT |
2724 | { |
2725 | struct dst_entry *dst = &first->u.dst; | |
2726 | struct xfrm_dst *last; | |
2727 | u32 mtu; | |
2728 | ||
92d63dec | 2729 | if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || |
1da177e4 LT |
2730 | (dst->dev && !netif_running(dst->dev))) |
2731 | return 0; | |
2732 | ||
a0073fe1 SK |
2733 | if (dst->flags & DST_XFRM_QUEUE) |
2734 | return 1; | |
2735 | ||
1da177e4 LT |
2736 | last = NULL; |
2737 | ||
2738 | do { | |
2739 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2740 | ||
1da177e4 LT |
2741 | if (dst->xfrm->km.state != XFRM_STATE_VALID) |
2742 | return 0; | |
80c802f3 TT |
2743 | if (xdst->xfrm_genid != dst->xfrm->genid) |
2744 | return 0; | |
b1312c89 TT |
2745 | if (xdst->num_pols > 0 && |
2746 | xdst->policy_genid != atomic_read(&xdst->pols[0]->genid)) | |
9d4a706d | 2747 | return 0; |
e53820de | 2748 | |
1da177e4 LT |
2749 | mtu = dst_mtu(dst->child); |
2750 | if (xdst->child_mtu_cached != mtu) { | |
2751 | last = xdst; | |
2752 | xdst->child_mtu_cached = mtu; | |
2753 | } | |
2754 | ||
92d63dec | 2755 | if (!dst_check(xdst->route, xdst->route_cookie)) |
1da177e4 LT |
2756 | return 0; |
2757 | mtu = dst_mtu(xdst->route); | |
2758 | if (xdst->route_mtu_cached != mtu) { | |
2759 | last = xdst; | |
2760 | xdst->route_mtu_cached = mtu; | |
2761 | } | |
2762 | ||
2763 | dst = dst->child; | |
2764 | } while (dst->xfrm); | |
2765 | ||
2766 | if (likely(!last)) | |
2767 | return 1; | |
2768 | ||
2769 | mtu = last->child_mtu_cached; | |
2770 | for (;;) { | |
2771 | dst = &last->u.dst; | |
2772 | ||
2773 | mtu = xfrm_state_mtu(dst->xfrm, mtu); | |
2774 | if (mtu > last->route_mtu_cached) | |
2775 | mtu = last->route_mtu_cached; | |
defb3519 | 2776 | dst_metric_set(dst, RTAX_MTU, mtu); |
1da177e4 LT |
2777 | |
2778 | if (last == first) | |
2779 | break; | |
2780 | ||
bd0bf076 | 2781 | last = (struct xfrm_dst *)last->u.dst.next; |
1da177e4 LT |
2782 | last->child_mtu_cached = mtu; |
2783 | } | |
2784 | ||
2785 | return 1; | |
2786 | } | |
2787 | ||
0dbaee3b DM |
2788 | static unsigned int xfrm_default_advmss(const struct dst_entry *dst) |
2789 | { | |
2790 | return dst_metric_advmss(dst->path); | |
2791 | } | |
2792 | ||
ebb762f2 | 2793 | static unsigned int xfrm_mtu(const struct dst_entry *dst) |
d33e4553 | 2794 | { |
618f9bc7 SK |
2795 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
2796 | ||
2797 | return mtu ? : dst_mtu(dst->path); | |
d33e4553 DM |
2798 | } |
2799 | ||
f894cbf8 DM |
2800 | static struct neighbour *xfrm_neigh_lookup(const struct dst_entry *dst, |
2801 | struct sk_buff *skb, | |
2802 | const void *daddr) | |
d3aaeb38 | 2803 | { |
f894cbf8 | 2804 | return dst->path->ops->neigh_lookup(dst, skb, daddr); |
d3aaeb38 DM |
2805 | } |
2806 | ||
1da177e4 LT |
2807 | int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) |
2808 | { | |
d7c7544c | 2809 | struct net *net; |
1da177e4 LT |
2810 | int err = 0; |
2811 | if (unlikely(afinfo == NULL)) | |
2812 | return -EINVAL; | |
2813 | if (unlikely(afinfo->family >= NPROTO)) | |
2814 | return -EAFNOSUPPORT; | |
ef8531b6 | 2815 | spin_lock(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2816 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) |
2817 | err = -ENOBUFS; | |
2818 | else { | |
2819 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2820 | if (likely(dst_ops->kmem_cachep == NULL)) | |
2821 | dst_ops->kmem_cachep = xfrm_dst_cache; | |
2822 | if (likely(dst_ops->check == NULL)) | |
2823 | dst_ops->check = xfrm_dst_check; | |
0dbaee3b DM |
2824 | if (likely(dst_ops->default_advmss == NULL)) |
2825 | dst_ops->default_advmss = xfrm_default_advmss; | |
ebb762f2 SK |
2826 | if (likely(dst_ops->mtu == NULL)) |
2827 | dst_ops->mtu = xfrm_mtu; | |
1da177e4 LT |
2828 | if (likely(dst_ops->negative_advice == NULL)) |
2829 | dst_ops->negative_advice = xfrm_negative_advice; | |
2830 | if (likely(dst_ops->link_failure == NULL)) | |
2831 | dst_ops->link_failure = xfrm_link_failure; | |
d3aaeb38 DM |
2832 | if (likely(dst_ops->neigh_lookup == NULL)) |
2833 | dst_ops->neigh_lookup = xfrm_neigh_lookup; | |
1da177e4 | 2834 | if (likely(afinfo->garbage_collect == NULL)) |
c0ed1c14 | 2835 | afinfo->garbage_collect = xfrm_garbage_collect_deferred; |
418a99ac | 2836 | rcu_assign_pointer(xfrm_policy_afinfo[afinfo->family], afinfo); |
1da177e4 | 2837 | } |
ef8531b6 | 2838 | spin_unlock(&xfrm_policy_afinfo_lock); |
d7c7544c AD |
2839 | |
2840 | rtnl_lock(); | |
2841 | for_each_net(net) { | |
2842 | struct dst_ops *xfrm_dst_ops; | |
2843 | ||
2844 | switch (afinfo->family) { | |
2845 | case AF_INET: | |
2846 | xfrm_dst_ops = &net->xfrm.xfrm4_dst_ops; | |
2847 | break; | |
dfd56b8b | 2848 | #if IS_ENABLED(CONFIG_IPV6) |
d7c7544c AD |
2849 | case AF_INET6: |
2850 | xfrm_dst_ops = &net->xfrm.xfrm6_dst_ops; | |
2851 | break; | |
2852 | #endif | |
2853 | default: | |
2854 | BUG(); | |
2855 | } | |
2856 | *xfrm_dst_ops = *afinfo->dst_ops; | |
2857 | } | |
2858 | rtnl_unlock(); | |
2859 | ||
1da177e4 LT |
2860 | return err; |
2861 | } | |
2862 | EXPORT_SYMBOL(xfrm_policy_register_afinfo); | |
2863 | ||
2864 | int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2865 | { | |
2866 | int err = 0; | |
2867 | if (unlikely(afinfo == NULL)) | |
2868 | return -EINVAL; | |
2869 | if (unlikely(afinfo->family >= NPROTO)) | |
2870 | return -EAFNOSUPPORT; | |
ef8531b6 | 2871 | spin_lock(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2872 | if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { |
2873 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) | |
2874 | err = -EINVAL; | |
ef8531b6 ED |
2875 | else |
2876 | RCU_INIT_POINTER(xfrm_policy_afinfo[afinfo->family], | |
2877 | NULL); | |
2878 | } | |
2879 | spin_unlock(&xfrm_policy_afinfo_lock); | |
2880 | if (!err) { | |
2881 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2882 | ||
2883 | synchronize_rcu(); | |
2884 | ||
2885 | dst_ops->kmem_cachep = NULL; | |
2886 | dst_ops->check = NULL; | |
2887 | dst_ops->negative_advice = NULL; | |
2888 | dst_ops->link_failure = NULL; | |
2889 | afinfo->garbage_collect = NULL; | |
1da177e4 | 2890 | } |
1da177e4 LT |
2891 | return err; |
2892 | } | |
2893 | EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); | |
2894 | ||
d7c7544c AD |
2895 | static void __net_init xfrm_dst_ops_init(struct net *net) |
2896 | { | |
2897 | struct xfrm_policy_afinfo *afinfo; | |
2898 | ||
ef8531b6 ED |
2899 | rcu_read_lock(); |
2900 | afinfo = rcu_dereference(xfrm_policy_afinfo[AF_INET]); | |
d7c7544c AD |
2901 | if (afinfo) |
2902 | net->xfrm.xfrm4_dst_ops = *afinfo->dst_ops; | |
dfd56b8b | 2903 | #if IS_ENABLED(CONFIG_IPV6) |
ef8531b6 | 2904 | afinfo = rcu_dereference(xfrm_policy_afinfo[AF_INET6]); |
d7c7544c AD |
2905 | if (afinfo) |
2906 | net->xfrm.xfrm6_dst_ops = *afinfo->dst_ops; | |
2907 | #endif | |
418a99ac | 2908 | rcu_read_unlock(); |
546be240 HX |
2909 | } |
2910 | ||
1da177e4 LT |
2911 | static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) |
2912 | { | |
351638e7 | 2913 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
e9dc8653 | 2914 | |
1da177e4 LT |
2915 | switch (event) { |
2916 | case NETDEV_DOWN: | |
c0ed1c14 | 2917 | xfrm_garbage_collect(dev_net(dev)); |
1da177e4 LT |
2918 | } |
2919 | return NOTIFY_DONE; | |
2920 | } | |
2921 | ||
2922 | static struct notifier_block xfrm_dev_notifier = { | |
d5917a35 | 2923 | .notifier_call = xfrm_dev_event, |
1da177e4 LT |
2924 | }; |
2925 | ||
558f82ef | 2926 | #ifdef CONFIG_XFRM_STATISTICS |
59c9940e | 2927 | static int __net_init xfrm_statistics_init(struct net *net) |
558f82ef | 2928 | { |
c68cd1a0 | 2929 | int rv; |
698365fa WC |
2930 | net->mib.xfrm_statistics = alloc_percpu(struct linux_xfrm_mib); |
2931 | if (!net->mib.xfrm_statistics) | |
558f82ef | 2932 | return -ENOMEM; |
c68cd1a0 AD |
2933 | rv = xfrm_proc_init(net); |
2934 | if (rv < 0) | |
698365fa | 2935 | free_percpu(net->mib.xfrm_statistics); |
c68cd1a0 | 2936 | return rv; |
558f82ef | 2937 | } |
59c9940e AD |
2938 | |
2939 | static void xfrm_statistics_fini(struct net *net) | |
2940 | { | |
c68cd1a0 | 2941 | xfrm_proc_fini(net); |
698365fa | 2942 | free_percpu(net->mib.xfrm_statistics); |
59c9940e AD |
2943 | } |
2944 | #else | |
2945 | static int __net_init xfrm_statistics_init(struct net *net) | |
2946 | { | |
2947 | return 0; | |
2948 | } | |
2949 | ||
2950 | static void xfrm_statistics_fini(struct net *net) | |
2951 | { | |
2952 | } | |
558f82ef MN |
2953 | #endif |
2954 | ||
d62ddc21 | 2955 | static int __net_init xfrm_policy_init(struct net *net) |
1da177e4 | 2956 | { |
2518c7c2 DM |
2957 | unsigned int hmask, sz; |
2958 | int dir; | |
2959 | ||
d62ddc21 AD |
2960 | if (net_eq(net, &init_net)) |
2961 | xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", | |
1da177e4 | 2962 | sizeof(struct xfrm_dst), |
e5d679f3 | 2963 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
20c2df83 | 2964 | NULL); |
1da177e4 | 2965 | |
2518c7c2 DM |
2966 | hmask = 8 - 1; |
2967 | sz = (hmask+1) * sizeof(struct hlist_head); | |
2968 | ||
93b851c1 AD |
2969 | net->xfrm.policy_byidx = xfrm_hash_alloc(sz); |
2970 | if (!net->xfrm.policy_byidx) | |
2971 | goto out_byidx; | |
8100bea7 | 2972 | net->xfrm.policy_idx_hmask = hmask; |
2518c7c2 | 2973 | |
53c2e285 | 2974 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
2518c7c2 DM |
2975 | struct xfrm_policy_hash *htab; |
2976 | ||
dc2caba7 | 2977 | net->xfrm.policy_count[dir] = 0; |
53c2e285 | 2978 | net->xfrm.policy_count[XFRM_POLICY_MAX + dir] = 0; |
8b18f8ea | 2979 | INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]); |
2518c7c2 | 2980 | |
a35f6c5d | 2981 | htab = &net->xfrm.policy_bydst[dir]; |
44e36b42 | 2982 | htab->table = xfrm_hash_alloc(sz); |
2518c7c2 | 2983 | if (!htab->table) |
a35f6c5d AD |
2984 | goto out_bydst; |
2985 | htab->hmask = hmask; | |
b58555f1 CG |
2986 | htab->dbits4 = 32; |
2987 | htab->sbits4 = 32; | |
2988 | htab->dbits6 = 128; | |
2989 | htab->sbits6 = 128; | |
2518c7c2 | 2990 | } |
880a6fab CG |
2991 | net->xfrm.policy_hthresh.lbits4 = 32; |
2992 | net->xfrm.policy_hthresh.rbits4 = 32; | |
2993 | net->xfrm.policy_hthresh.lbits6 = 128; | |
2994 | net->xfrm.policy_hthresh.rbits6 = 128; | |
2995 | ||
2996 | seqlock_init(&net->xfrm.policy_hthresh.lock); | |
2518c7c2 | 2997 | |
adfcf0b2 | 2998 | INIT_LIST_HEAD(&net->xfrm.policy_all); |
66caf628 | 2999 | INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize); |
880a6fab | 3000 | INIT_WORK(&net->xfrm.policy_hthresh.work, xfrm_hash_rebuild); |
d62ddc21 AD |
3001 | if (net_eq(net, &init_net)) |
3002 | register_netdevice_notifier(&xfrm_dev_notifier); | |
3003 | return 0; | |
93b851c1 | 3004 | |
a35f6c5d AD |
3005 | out_bydst: |
3006 | for (dir--; dir >= 0; dir--) { | |
3007 | struct xfrm_policy_hash *htab; | |
3008 | ||
3009 | htab = &net->xfrm.policy_bydst[dir]; | |
3010 | xfrm_hash_free(htab->table, sz); | |
3011 | } | |
3012 | xfrm_hash_free(net->xfrm.policy_byidx, sz); | |
93b851c1 AD |
3013 | out_byidx: |
3014 | return -ENOMEM; | |
d62ddc21 AD |
3015 | } |
3016 | ||
3017 | static void xfrm_policy_fini(struct net *net) | |
3018 | { | |
93b851c1 | 3019 | unsigned int sz; |
8b18f8ea | 3020 | int dir; |
93b851c1 | 3021 | |
7c2776ee AD |
3022 | flush_work(&net->xfrm.policy_hash_work); |
3023 | #ifdef CONFIG_XFRM_SUB_POLICY | |
2e71029e | 3024 | xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, false); |
7c2776ee | 3025 | #endif |
2e71029e | 3026 | xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, false); |
7c2776ee | 3027 | |
adfcf0b2 | 3028 | WARN_ON(!list_empty(&net->xfrm.policy_all)); |
93b851c1 | 3029 | |
53c2e285 | 3030 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
a35f6c5d AD |
3031 | struct xfrm_policy_hash *htab; |
3032 | ||
8b18f8ea | 3033 | WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir])); |
a35f6c5d AD |
3034 | |
3035 | htab = &net->xfrm.policy_bydst[dir]; | |
5b653b2a | 3036 | sz = (htab->hmask + 1) * sizeof(struct hlist_head); |
a35f6c5d AD |
3037 | WARN_ON(!hlist_empty(htab->table)); |
3038 | xfrm_hash_free(htab->table, sz); | |
8b18f8ea AD |
3039 | } |
3040 | ||
8100bea7 | 3041 | sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head); |
93b851c1 AD |
3042 | WARN_ON(!hlist_empty(net->xfrm.policy_byidx)); |
3043 | xfrm_hash_free(net->xfrm.policy_byidx, sz); | |
1da177e4 LT |
3044 | } |
3045 | ||
d62ddc21 AD |
3046 | static int __net_init xfrm_net_init(struct net *net) |
3047 | { | |
3048 | int rv; | |
3049 | ||
59c9940e AD |
3050 | rv = xfrm_statistics_init(net); |
3051 | if (rv < 0) | |
3052 | goto out_statistics; | |
d62ddc21 AD |
3053 | rv = xfrm_state_init(net); |
3054 | if (rv < 0) | |
3055 | goto out_state; | |
3056 | rv = xfrm_policy_init(net); | |
3057 | if (rv < 0) | |
3058 | goto out_policy; | |
d7c7544c | 3059 | xfrm_dst_ops_init(net); |
b27aeadb AD |
3060 | rv = xfrm_sysctl_init(net); |
3061 | if (rv < 0) | |
3062 | goto out_sysctl; | |
4a93f509 SK |
3063 | rv = flow_cache_init(net); |
3064 | if (rv < 0) | |
3065 | goto out; | |
283bc9f3 FD |
3066 | |
3067 | /* Initialize the per-net locks here */ | |
3068 | spin_lock_init(&net->xfrm.xfrm_state_lock); | |
3069 | rwlock_init(&net->xfrm.xfrm_policy_lock); | |
283bc9f3 FD |
3070 | mutex_init(&net->xfrm.xfrm_cfg_mutex); |
3071 | ||
d62ddc21 AD |
3072 | return 0; |
3073 | ||
4a93f509 SK |
3074 | out: |
3075 | xfrm_sysctl_fini(net); | |
b27aeadb AD |
3076 | out_sysctl: |
3077 | xfrm_policy_fini(net); | |
d62ddc21 AD |
3078 | out_policy: |
3079 | xfrm_state_fini(net); | |
3080 | out_state: | |
59c9940e AD |
3081 | xfrm_statistics_fini(net); |
3082 | out_statistics: | |
d62ddc21 AD |
3083 | return rv; |
3084 | } | |
3085 | ||
3086 | static void __net_exit xfrm_net_exit(struct net *net) | |
3087 | { | |
4a93f509 | 3088 | flow_cache_fini(net); |
b27aeadb | 3089 | xfrm_sysctl_fini(net); |
d62ddc21 AD |
3090 | xfrm_policy_fini(net); |
3091 | xfrm_state_fini(net); | |
59c9940e | 3092 | xfrm_statistics_fini(net); |
d62ddc21 AD |
3093 | } |
3094 | ||
3095 | static struct pernet_operations __net_initdata xfrm_net_ops = { | |
3096 | .init = xfrm_net_init, | |
3097 | .exit = xfrm_net_exit, | |
3098 | }; | |
3099 | ||
1da177e4 LT |
3100 | void __init xfrm_init(void) |
3101 | { | |
d62ddc21 | 3102 | register_pernet_subsys(&xfrm_net_ops); |
1da177e4 LT |
3103 | xfrm_input_init(); |
3104 | } | |
3105 | ||
ab5f5e8b | 3106 | #ifdef CONFIG_AUDITSYSCALL |
1486cbd7 IJ |
3107 | static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp, |
3108 | struct audit_buffer *audit_buf) | |
ab5f5e8b | 3109 | { |
875179fa PM |
3110 | struct xfrm_sec_ctx *ctx = xp->security; |
3111 | struct xfrm_selector *sel = &xp->selector; | |
3112 | ||
3113 | if (ctx) | |
ab5f5e8b | 3114 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", |
875179fa | 3115 | ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); |
ab5f5e8b | 3116 | |
9b7a787d | 3117 | switch (sel->family) { |
ab5f5e8b | 3118 | case AF_INET: |
21454aaa | 3119 | audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4); |
875179fa PM |
3120 | if (sel->prefixlen_s != 32) |
3121 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
3122 | sel->prefixlen_s); | |
21454aaa | 3123 | audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4); |
875179fa PM |
3124 | if (sel->prefixlen_d != 32) |
3125 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
3126 | sel->prefixlen_d); | |
ab5f5e8b JL |
3127 | break; |
3128 | case AF_INET6: | |
5b095d98 | 3129 | audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6); |
875179fa PM |
3130 | if (sel->prefixlen_s != 128) |
3131 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
3132 | sel->prefixlen_s); | |
5b095d98 | 3133 | audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6); |
875179fa PM |
3134 | if (sel->prefixlen_d != 128) |
3135 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
3136 | sel->prefixlen_d); | |
ab5f5e8b JL |
3137 | break; |
3138 | } | |
3139 | } | |
3140 | ||
2e71029e | 3141 | void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid) |
ab5f5e8b JL |
3142 | { |
3143 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 3144 | |
afeb14b4 | 3145 | audit_buf = xfrm_audit_start("SPD-add"); |
ab5f5e8b JL |
3146 | if (audit_buf == NULL) |
3147 | return; | |
2e71029e | 3148 | xfrm_audit_helper_usrinfo(task_valid, audit_buf); |
afeb14b4 | 3149 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
3150 | xfrm_audit_common_policyinfo(xp, audit_buf); |
3151 | audit_log_end(audit_buf); | |
3152 | } | |
3153 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_add); | |
3154 | ||
68277acc | 3155 | void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, |
2e71029e | 3156 | bool task_valid) |
ab5f5e8b JL |
3157 | { |
3158 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 3159 | |
afeb14b4 | 3160 | audit_buf = xfrm_audit_start("SPD-delete"); |
ab5f5e8b JL |
3161 | if (audit_buf == NULL) |
3162 | return; | |
2e71029e | 3163 | xfrm_audit_helper_usrinfo(task_valid, audit_buf); |
afeb14b4 | 3164 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
3165 | xfrm_audit_common_policyinfo(xp, audit_buf); |
3166 | audit_log_end(audit_buf); | |
3167 | } | |
3168 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete); | |
3169 | #endif | |
3170 | ||
80c9abaa | 3171 | #ifdef CONFIG_XFRM_MIGRATE |
bc9b35ad DM |
3172 | static bool xfrm_migrate_selector_match(const struct xfrm_selector *sel_cmp, |
3173 | const struct xfrm_selector *sel_tgt) | |
80c9abaa SS |
3174 | { |
3175 | if (sel_cmp->proto == IPSEC_ULPROTO_ANY) { | |
3176 | if (sel_tgt->family == sel_cmp->family && | |
70e94e66 YH |
3177 | xfrm_addr_equal(&sel_tgt->daddr, &sel_cmp->daddr, |
3178 | sel_cmp->family) && | |
3179 | xfrm_addr_equal(&sel_tgt->saddr, &sel_cmp->saddr, | |
3180 | sel_cmp->family) && | |
80c9abaa SS |
3181 | sel_tgt->prefixlen_d == sel_cmp->prefixlen_d && |
3182 | sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) { | |
bc9b35ad | 3183 | return true; |
80c9abaa SS |
3184 | } |
3185 | } else { | |
3186 | if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) { | |
bc9b35ad | 3187 | return true; |
80c9abaa SS |
3188 | } |
3189 | } | |
bc9b35ad | 3190 | return false; |
80c9abaa SS |
3191 | } |
3192 | ||
3e94c2dc WC |
3193 | static struct xfrm_policy *xfrm_migrate_policy_find(const struct xfrm_selector *sel, |
3194 | u8 dir, u8 type, struct net *net) | |
80c9abaa SS |
3195 | { |
3196 | struct xfrm_policy *pol, *ret = NULL; | |
80c9abaa SS |
3197 | struct hlist_head *chain; |
3198 | u32 priority = ~0U; | |
3199 | ||
283bc9f3 | 3200 | read_lock_bh(&net->xfrm.xfrm_policy_lock); /*FIXME*/ |
8d549c4f | 3201 | chain = policy_hash_direct(net, &sel->daddr, &sel->saddr, sel->family, dir); |
b67bfe0d | 3202 | hlist_for_each_entry(pol, chain, bydst) { |
80c9abaa SS |
3203 | if (xfrm_migrate_selector_match(sel, &pol->selector) && |
3204 | pol->type == type) { | |
3205 | ret = pol; | |
3206 | priority = ret->priority; | |
3207 | break; | |
3208 | } | |
3209 | } | |
8d549c4f | 3210 | chain = &net->xfrm.policy_inexact[dir]; |
b67bfe0d | 3211 | hlist_for_each_entry(pol, chain, bydst) { |
80c9abaa SS |
3212 | if (xfrm_migrate_selector_match(sel, &pol->selector) && |
3213 | pol->type == type && | |
3214 | pol->priority < priority) { | |
3215 | ret = pol; | |
3216 | break; | |
3217 | } | |
3218 | } | |
3219 | ||
3220 | if (ret) | |
3221 | xfrm_pol_hold(ret); | |
3222 | ||
283bc9f3 | 3223 | read_unlock_bh(&net->xfrm.xfrm_policy_lock); |
80c9abaa SS |
3224 | |
3225 | return ret; | |
3226 | } | |
3227 | ||
dd701754 | 3228 | static int migrate_tmpl_match(const struct xfrm_migrate *m, const struct xfrm_tmpl *t) |
80c9abaa SS |
3229 | { |
3230 | int match = 0; | |
3231 | ||
3232 | if (t->mode == m->mode && t->id.proto == m->proto && | |
3233 | (m->reqid == 0 || t->reqid == m->reqid)) { | |
3234 | switch (t->mode) { | |
3235 | case XFRM_MODE_TUNNEL: | |
3236 | case XFRM_MODE_BEET: | |
70e94e66 YH |
3237 | if (xfrm_addr_equal(&t->id.daddr, &m->old_daddr, |
3238 | m->old_family) && | |
3239 | xfrm_addr_equal(&t->saddr, &m->old_saddr, | |
3240 | m->old_family)) { | |
80c9abaa SS |
3241 | match = 1; |
3242 | } | |
3243 | break; | |
3244 | case XFRM_MODE_TRANSPORT: | |
3245 | /* in case of transport mode, template does not store | |
3246 | any IP addresses, hence we just compare mode and | |
3247 | protocol */ | |
3248 | match = 1; | |
3249 | break; | |
3250 | default: | |
3251 | break; | |
3252 | } | |
3253 | } | |
3254 | return match; | |
3255 | } | |
3256 | ||
3257 | /* update endpoint address(es) of template(s) */ | |
3258 | static int xfrm_policy_migrate(struct xfrm_policy *pol, | |
3259 | struct xfrm_migrate *m, int num_migrate) | |
3260 | { | |
3261 | struct xfrm_migrate *mp; | |
80c9abaa SS |
3262 | int i, j, n = 0; |
3263 | ||
3264 | write_lock_bh(&pol->lock); | |
12a169e7 | 3265 | if (unlikely(pol->walk.dead)) { |
80c9abaa SS |
3266 | /* target policy has been deleted */ |
3267 | write_unlock_bh(&pol->lock); | |
3268 | return -ENOENT; | |
3269 | } | |
3270 | ||
3271 | for (i = 0; i < pol->xfrm_nr; i++) { | |
3272 | for (j = 0, mp = m; j < num_migrate; j++, mp++) { | |
3273 | if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i])) | |
3274 | continue; | |
3275 | n++; | |
1bfcb10f HX |
3276 | if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL && |
3277 | pol->xfrm_vec[i].mode != XFRM_MODE_BEET) | |
80c9abaa SS |
3278 | continue; |
3279 | /* update endpoints */ | |
3280 | memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr, | |
3281 | sizeof(pol->xfrm_vec[i].id.daddr)); | |
3282 | memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr, | |
3283 | sizeof(pol->xfrm_vec[i].saddr)); | |
3284 | pol->xfrm_vec[i].encap_family = mp->new_family; | |
3285 | /* flush bundles */ | |
80c802f3 | 3286 | atomic_inc(&pol->genid); |
80c9abaa SS |
3287 | } |
3288 | } | |
3289 | ||
3290 | write_unlock_bh(&pol->lock); | |
3291 | ||
3292 | if (!n) | |
3293 | return -ENODATA; | |
3294 | ||
3295 | return 0; | |
3296 | } | |
3297 | ||
dd701754 | 3298 | static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate) |
80c9abaa SS |
3299 | { |
3300 | int i, j; | |
3301 | ||
3302 | if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) | |
3303 | return -EINVAL; | |
3304 | ||
3305 | for (i = 0; i < num_migrate; i++) { | |
70e94e66 YH |
3306 | if (xfrm_addr_equal(&m[i].old_daddr, &m[i].new_daddr, |
3307 | m[i].old_family) && | |
3308 | xfrm_addr_equal(&m[i].old_saddr, &m[i].new_saddr, | |
3309 | m[i].old_family)) | |
80c9abaa SS |
3310 | return -EINVAL; |
3311 | if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) || | |
3312 | xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) | |
3313 | return -EINVAL; | |
3314 | ||
3315 | /* check if there is any duplicated entry */ | |
3316 | for (j = i + 1; j < num_migrate; j++) { | |
3317 | if (!memcmp(&m[i].old_daddr, &m[j].old_daddr, | |
3318 | sizeof(m[i].old_daddr)) && | |
3319 | !memcmp(&m[i].old_saddr, &m[j].old_saddr, | |
3320 | sizeof(m[i].old_saddr)) && | |
3321 | m[i].proto == m[j].proto && | |
3322 | m[i].mode == m[j].mode && | |
3323 | m[i].reqid == m[j].reqid && | |
3324 | m[i].old_family == m[j].old_family) | |
3325 | return -EINVAL; | |
3326 | } | |
3327 | } | |
3328 | ||
3329 | return 0; | |
3330 | } | |
3331 | ||
b4b7c0b3 | 3332 | int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, |
13c1d189 | 3333 | struct xfrm_migrate *m, int num_migrate, |
8d549c4f | 3334 | struct xfrm_kmaddress *k, struct net *net) |
80c9abaa SS |
3335 | { |
3336 | int i, err, nx_cur = 0, nx_new = 0; | |
3337 | struct xfrm_policy *pol = NULL; | |
3338 | struct xfrm_state *x, *xc; | |
3339 | struct xfrm_state *x_cur[XFRM_MAX_DEPTH]; | |
3340 | struct xfrm_state *x_new[XFRM_MAX_DEPTH]; | |
3341 | struct xfrm_migrate *mp; | |
3342 | ||
3343 | if ((err = xfrm_migrate_check(m, num_migrate)) < 0) | |
3344 | goto out; | |
3345 | ||
3346 | /* Stage 1 - find policy */ | |
8d549c4f | 3347 | if ((pol = xfrm_migrate_policy_find(sel, dir, type, net)) == NULL) { |
80c9abaa SS |
3348 | err = -ENOENT; |
3349 | goto out; | |
3350 | } | |
3351 | ||
3352 | /* Stage 2 - find and update state(s) */ | |
3353 | for (i = 0, mp = m; i < num_migrate; i++, mp++) { | |
283bc9f3 | 3354 | if ((x = xfrm_migrate_state_find(mp, net))) { |
80c9abaa SS |
3355 | x_cur[nx_cur] = x; |
3356 | nx_cur++; | |
3357 | if ((xc = xfrm_state_migrate(x, mp))) { | |
3358 | x_new[nx_new] = xc; | |
3359 | nx_new++; | |
3360 | } else { | |
3361 | err = -ENODATA; | |
3362 | goto restore_state; | |
3363 | } | |
3364 | } | |
3365 | } | |
3366 | ||
3367 | /* Stage 3 - update policy */ | |
3368 | if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0) | |
3369 | goto restore_state; | |
3370 | ||
3371 | /* Stage 4 - delete old state(s) */ | |
3372 | if (nx_cur) { | |
3373 | xfrm_states_put(x_cur, nx_cur); | |
3374 | xfrm_states_delete(x_cur, nx_cur); | |
3375 | } | |
3376 | ||
3377 | /* Stage 5 - announce */ | |
13c1d189 | 3378 | km_migrate(sel, dir, type, m, num_migrate, k); |
80c9abaa SS |
3379 | |
3380 | xfrm_pol_put(pol); | |
3381 | ||
3382 | return 0; | |
3383 | out: | |
3384 | return err; | |
3385 | ||
3386 | restore_state: | |
3387 | if (pol) | |
3388 | xfrm_pol_put(pol); | |
3389 | if (nx_cur) | |
3390 | xfrm_states_put(x_cur, nx_cur); | |
3391 | if (nx_new) | |
3392 | xfrm_states_delete(x_new, nx_new); | |
3393 | ||
3394 | return err; | |
3395 | } | |
e610e679 | 3396 | EXPORT_SYMBOL(xfrm_migrate); |
80c9abaa | 3397 | #endif |