Commit | Line | Data |
---|---|---|
a716c119 | 1 | /* |
1da177e4 LT |
2 | * xfrm_policy.c |
3 | * | |
4 | * Changes: | |
5 | * Mitsuru KANDA @USAGI | |
6 | * Kazunori MIYAZAWA @USAGI | |
7 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> | |
8 | * IPv6 support | |
9 | * Kazunori MIYAZAWA @USAGI | |
10 | * YOSHIFUJI Hideaki | |
11 | * Split up af-specific portion | |
12 | * Derek Atkins <derek@ihtfp.com> Add the post_input processor | |
df71837d | 13 | * |
1da177e4 LT |
14 | */ |
15 | ||
66cdb3ca | 16 | #include <linux/err.h> |
1da177e4 LT |
17 | #include <linux/slab.h> |
18 | #include <linux/kmod.h> | |
19 | #include <linux/list.h> | |
20 | #include <linux/spinlock.h> | |
21 | #include <linux/workqueue.h> | |
22 | #include <linux/notifier.h> | |
23 | #include <linux/netdevice.h> | |
eb9c7ebe | 24 | #include <linux/netfilter.h> |
1da177e4 | 25 | #include <linux/module.h> |
2518c7c2 | 26 | #include <linux/cache.h> |
68277acc | 27 | #include <linux/audit.h> |
25ee3286 | 28 | #include <net/dst.h> |
6ce74ec7 | 29 | #include <net/flow.h> |
1da177e4 LT |
30 | #include <net/xfrm.h> |
31 | #include <net/ip.h> | |
558f82ef MN |
32 | #ifdef CONFIG_XFRM_STATISTICS |
33 | #include <net/snmp.h> | |
34 | #endif | |
1da177e4 | 35 | |
44e36b42 DM |
36 | #include "xfrm_hash.h" |
37 | ||
4a3e2f71 AV |
38 | DEFINE_MUTEX(xfrm_cfg_mutex); |
39 | EXPORT_SYMBOL(xfrm_cfg_mutex); | |
1da177e4 | 40 | |
80c802f3 TT |
41 | static DEFINE_SPINLOCK(xfrm_policy_sk_bundle_lock); |
42 | static struct dst_entry *xfrm_policy_sk_bundles; | |
1da177e4 LT |
43 | static DEFINE_RWLOCK(xfrm_policy_lock); |
44 | ||
418a99ac PJ |
45 | static DEFINE_SPINLOCK(xfrm_policy_afinfo_lock); |
46 | static struct xfrm_policy_afinfo __rcu *xfrm_policy_afinfo[NPROTO] | |
47 | __read_mostly; | |
1da177e4 | 48 | |
e18b890b | 49 | static struct kmem_cache *xfrm_dst_cache __read_mostly; |
1da177e4 | 50 | |
25ee3286 | 51 | static void xfrm_init_pmtu(struct dst_entry *dst); |
80c802f3 | 52 | static int stale_bundle(struct dst_entry *dst); |
12fdb4d3 | 53 | static int xfrm_bundle_ok(struct xfrm_dst *xdst); |
1c4c40c4 | 54 | |
1da177e4 | 55 | |
29fa0b30 WY |
56 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, |
57 | int dir); | |
58 | ||
bc9b35ad | 59 | static inline bool |
200ce96e | 60 | __xfrm4_selector_match(const struct xfrm_selector *sel, const struct flowi *fl) |
77681021 | 61 | { |
7e1dc7b6 DM |
62 | const struct flowi4 *fl4 = &fl->u.ip4; |
63 | ||
26bff940 AD |
64 | return addr4_match(fl4->daddr, sel->daddr.a4, sel->prefixlen_d) && |
65 | addr4_match(fl4->saddr, sel->saddr.a4, sel->prefixlen_s) && | |
7e1dc7b6 DM |
66 | !((xfrm_flowi_dport(fl, &fl4->uli) ^ sel->dport) & sel->dport_mask) && |
67 | !((xfrm_flowi_sport(fl, &fl4->uli) ^ sel->sport) & sel->sport_mask) && | |
68 | (fl4->flowi4_proto == sel->proto || !sel->proto) && | |
69 | (fl4->flowi4_oif == sel->ifindex || !sel->ifindex); | |
77681021 AM |
70 | } |
71 | ||
bc9b35ad | 72 | static inline bool |
200ce96e | 73 | __xfrm6_selector_match(const struct xfrm_selector *sel, const struct flowi *fl) |
77681021 | 74 | { |
7e1dc7b6 DM |
75 | const struct flowi6 *fl6 = &fl->u.ip6; |
76 | ||
77 | return addr_match(&fl6->daddr, &sel->daddr, sel->prefixlen_d) && | |
78 | addr_match(&fl6->saddr, &sel->saddr, sel->prefixlen_s) && | |
79 | !((xfrm_flowi_dport(fl, &fl6->uli) ^ sel->dport) & sel->dport_mask) && | |
80 | !((xfrm_flowi_sport(fl, &fl6->uli) ^ sel->sport) & sel->sport_mask) && | |
81 | (fl6->flowi6_proto == sel->proto || !sel->proto) && | |
82 | (fl6->flowi6_oif == sel->ifindex || !sel->ifindex); | |
77681021 AM |
83 | } |
84 | ||
bc9b35ad DM |
85 | bool xfrm_selector_match(const struct xfrm_selector *sel, const struct flowi *fl, |
86 | unsigned short family) | |
77681021 AM |
87 | { |
88 | switch (family) { | |
89 | case AF_INET: | |
90 | return __xfrm4_selector_match(sel, fl); | |
91 | case AF_INET6: | |
92 | return __xfrm6_selector_match(sel, fl); | |
93 | } | |
bc9b35ad | 94 | return false; |
77681021 AM |
95 | } |
96 | ||
ef8531b6 ED |
97 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) |
98 | { | |
99 | struct xfrm_policy_afinfo *afinfo; | |
100 | ||
101 | if (unlikely(family >= NPROTO)) | |
102 | return NULL; | |
103 | rcu_read_lock(); | |
104 | afinfo = rcu_dereference(xfrm_policy_afinfo[family]); | |
105 | if (unlikely(!afinfo)) | |
106 | rcu_read_unlock(); | |
107 | return afinfo; | |
108 | } | |
109 | ||
110 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo) | |
111 | { | |
112 | rcu_read_unlock(); | |
113 | } | |
114 | ||
c5b3cf46 | 115 | static inline struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, |
6418c4e0 DM |
116 | const xfrm_address_t *saddr, |
117 | const xfrm_address_t *daddr, | |
9bb182a7 YH |
118 | int family) |
119 | { | |
120 | struct xfrm_policy_afinfo *afinfo; | |
121 | struct dst_entry *dst; | |
122 | ||
123 | afinfo = xfrm_policy_get_afinfo(family); | |
124 | if (unlikely(afinfo == NULL)) | |
125 | return ERR_PTR(-EAFNOSUPPORT); | |
126 | ||
c5b3cf46 | 127 | dst = afinfo->dst_lookup(net, tos, saddr, daddr); |
9bb182a7 YH |
128 | |
129 | xfrm_policy_put_afinfo(afinfo); | |
130 | ||
131 | return dst; | |
132 | } | |
133 | ||
25ee3286 | 134 | static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos, |
9bb182a7 YH |
135 | xfrm_address_t *prev_saddr, |
136 | xfrm_address_t *prev_daddr, | |
25ee3286 | 137 | int family) |
1da177e4 | 138 | { |
c5b3cf46 | 139 | struct net *net = xs_net(x); |
66cdb3ca HX |
140 | xfrm_address_t *saddr = &x->props.saddr; |
141 | xfrm_address_t *daddr = &x->id.daddr; | |
66cdb3ca HX |
142 | struct dst_entry *dst; |
143 | ||
9bb182a7 | 144 | if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) { |
66cdb3ca | 145 | saddr = x->coaddr; |
9bb182a7 YH |
146 | daddr = prev_daddr; |
147 | } | |
148 | if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) { | |
149 | saddr = prev_saddr; | |
66cdb3ca | 150 | daddr = x->coaddr; |
9bb182a7 | 151 | } |
1da177e4 | 152 | |
c5b3cf46 | 153 | dst = __xfrm_dst_lookup(net, tos, saddr, daddr, family); |
9bb182a7 YH |
154 | |
155 | if (!IS_ERR(dst)) { | |
156 | if (prev_saddr != saddr) | |
157 | memcpy(prev_saddr, saddr, sizeof(*prev_saddr)); | |
158 | if (prev_daddr != daddr) | |
159 | memcpy(prev_daddr, daddr, sizeof(*prev_daddr)); | |
160 | } | |
1da177e4 | 161 | |
66cdb3ca | 162 | return dst; |
1da177e4 | 163 | } |
1da177e4 | 164 | |
1da177e4 LT |
165 | static inline unsigned long make_jiffies(long secs) |
166 | { | |
167 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
168 | return MAX_SCHEDULE_TIMEOUT-1; | |
169 | else | |
a716c119 | 170 | return secs*HZ; |
1da177e4 LT |
171 | } |
172 | ||
173 | static void xfrm_policy_timer(unsigned long data) | |
174 | { | |
175 | struct xfrm_policy *xp = (struct xfrm_policy*)data; | |
9d729f72 | 176 | unsigned long now = get_seconds(); |
1da177e4 LT |
177 | long next = LONG_MAX; |
178 | int warn = 0; | |
179 | int dir; | |
180 | ||
181 | read_lock(&xp->lock); | |
182 | ||
ea2dea9d | 183 | if (unlikely(xp->walk.dead)) |
1da177e4 LT |
184 | goto out; |
185 | ||
77d8d7a6 | 186 | dir = xfrm_policy_id2dir(xp->index); |
1da177e4 LT |
187 | |
188 | if (xp->lft.hard_add_expires_seconds) { | |
189 | long tmo = xp->lft.hard_add_expires_seconds + | |
190 | xp->curlft.add_time - now; | |
191 | if (tmo <= 0) | |
192 | goto expired; | |
193 | if (tmo < next) | |
194 | next = tmo; | |
195 | } | |
196 | if (xp->lft.hard_use_expires_seconds) { | |
197 | long tmo = xp->lft.hard_use_expires_seconds + | |
198 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
199 | if (tmo <= 0) | |
200 | goto expired; | |
201 | if (tmo < next) | |
202 | next = tmo; | |
203 | } | |
204 | if (xp->lft.soft_add_expires_seconds) { | |
205 | long tmo = xp->lft.soft_add_expires_seconds + | |
206 | xp->curlft.add_time - now; | |
207 | if (tmo <= 0) { | |
208 | warn = 1; | |
209 | tmo = XFRM_KM_TIMEOUT; | |
210 | } | |
211 | if (tmo < next) | |
212 | next = tmo; | |
213 | } | |
214 | if (xp->lft.soft_use_expires_seconds) { | |
215 | long tmo = xp->lft.soft_use_expires_seconds + | |
216 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
217 | if (tmo <= 0) { | |
218 | warn = 1; | |
219 | tmo = XFRM_KM_TIMEOUT; | |
220 | } | |
221 | if (tmo < next) | |
222 | next = tmo; | |
223 | } | |
224 | ||
225 | if (warn) | |
6c5c8ca7 | 226 | km_policy_expired(xp, dir, 0, 0); |
1da177e4 LT |
227 | if (next != LONG_MAX && |
228 | !mod_timer(&xp->timer, jiffies + make_jiffies(next))) | |
229 | xfrm_pol_hold(xp); | |
230 | ||
231 | out: | |
232 | read_unlock(&xp->lock); | |
233 | xfrm_pol_put(xp); | |
234 | return; | |
235 | ||
236 | expired: | |
237 | read_unlock(&xp->lock); | |
4666faab | 238 | if (!xfrm_policy_delete(xp, dir)) |
6c5c8ca7 | 239 | km_policy_expired(xp, dir, 1, 0); |
1da177e4 LT |
240 | xfrm_pol_put(xp); |
241 | } | |
242 | ||
fe1a5f03 TT |
243 | static struct flow_cache_object *xfrm_policy_flo_get(struct flow_cache_object *flo) |
244 | { | |
245 | struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo); | |
246 | ||
247 | if (unlikely(pol->walk.dead)) | |
248 | flo = NULL; | |
249 | else | |
250 | xfrm_pol_hold(pol); | |
251 | ||
252 | return flo; | |
253 | } | |
254 | ||
255 | static int xfrm_policy_flo_check(struct flow_cache_object *flo) | |
256 | { | |
257 | struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo); | |
258 | ||
259 | return !pol->walk.dead; | |
260 | } | |
261 | ||
262 | static void xfrm_policy_flo_delete(struct flow_cache_object *flo) | |
263 | { | |
264 | xfrm_pol_put(container_of(flo, struct xfrm_policy, flo)); | |
265 | } | |
266 | ||
267 | static const struct flow_cache_ops xfrm_policy_fc_ops = { | |
268 | .get = xfrm_policy_flo_get, | |
269 | .check = xfrm_policy_flo_check, | |
270 | .delete = xfrm_policy_flo_delete, | |
271 | }; | |
1da177e4 LT |
272 | |
273 | /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2 | |
274 | * SPD calls. | |
275 | */ | |
276 | ||
0331b1f3 | 277 | struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp) |
1da177e4 LT |
278 | { |
279 | struct xfrm_policy *policy; | |
280 | ||
0da974f4 | 281 | policy = kzalloc(sizeof(struct xfrm_policy), gfp); |
1da177e4 LT |
282 | |
283 | if (policy) { | |
0331b1f3 | 284 | write_pnet(&policy->xp_net, net); |
12a169e7 | 285 | INIT_LIST_HEAD(&policy->walk.all); |
2518c7c2 DM |
286 | INIT_HLIST_NODE(&policy->bydst); |
287 | INIT_HLIST_NODE(&policy->byidx); | |
1da177e4 | 288 | rwlock_init(&policy->lock); |
2518c7c2 | 289 | atomic_set(&policy->refcnt, 1); |
b24b8a24 PE |
290 | setup_timer(&policy->timer, xfrm_policy_timer, |
291 | (unsigned long)policy); | |
fe1a5f03 | 292 | policy->flo.ops = &xfrm_policy_fc_ops; |
1da177e4 LT |
293 | } |
294 | return policy; | |
295 | } | |
296 | EXPORT_SYMBOL(xfrm_policy_alloc); | |
297 | ||
298 | /* Destroy xfrm_policy: descendant resources must be released to this moment. */ | |
299 | ||
64c31b3f | 300 | void xfrm_policy_destroy(struct xfrm_policy *policy) |
1da177e4 | 301 | { |
12a169e7 | 302 | BUG_ON(!policy->walk.dead); |
1da177e4 | 303 | |
1da177e4 LT |
304 | if (del_timer(&policy->timer)) |
305 | BUG(); | |
306 | ||
03e1ad7b | 307 | security_xfrm_policy_free(policy->security); |
1da177e4 LT |
308 | kfree(policy); |
309 | } | |
64c31b3f | 310 | EXPORT_SYMBOL(xfrm_policy_destroy); |
1da177e4 | 311 | |
1da177e4 LT |
312 | /* Rule must be locked. Release descentant resources, announce |
313 | * entry dead. The rule must be unlinked from lists to the moment. | |
314 | */ | |
315 | ||
316 | static void xfrm_policy_kill(struct xfrm_policy *policy) | |
317 | { | |
12a169e7 | 318 | policy->walk.dead = 1; |
1da177e4 | 319 | |
285ead17 | 320 | atomic_inc(&policy->genid); |
1da177e4 | 321 | |
285ead17 TT |
322 | if (del_timer(&policy->timer)) |
323 | xfrm_pol_put(policy); | |
324 | ||
325 | xfrm_pol_put(policy); | |
1da177e4 LT |
326 | } |
327 | ||
2518c7c2 DM |
328 | static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024; |
329 | ||
e92303f8 | 330 | static inline unsigned int idx_hash(struct net *net, u32 index) |
2518c7c2 | 331 | { |
e92303f8 | 332 | return __idx_hash(index, net->xfrm.policy_idx_hmask); |
2518c7c2 DM |
333 | } |
334 | ||
5f803b58 DM |
335 | static struct hlist_head *policy_hash_bysel(struct net *net, |
336 | const struct xfrm_selector *sel, | |
337 | unsigned short family, int dir) | |
2518c7c2 | 338 | { |
1121994c | 339 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
340 | unsigned int hash = __sel_hash(sel, family, hmask); |
341 | ||
342 | return (hash == hmask + 1 ? | |
1121994c AD |
343 | &net->xfrm.policy_inexact[dir] : |
344 | net->xfrm.policy_bydst[dir].table + hash); | |
2518c7c2 DM |
345 | } |
346 | ||
5f803b58 DM |
347 | static struct hlist_head *policy_hash_direct(struct net *net, |
348 | const xfrm_address_t *daddr, | |
349 | const xfrm_address_t *saddr, | |
350 | unsigned short family, int dir) | |
2518c7c2 | 351 | { |
1121994c | 352 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
353 | unsigned int hash = __addr_hash(daddr, saddr, family, hmask); |
354 | ||
1121994c | 355 | return net->xfrm.policy_bydst[dir].table + hash; |
2518c7c2 DM |
356 | } |
357 | ||
2518c7c2 DM |
358 | static void xfrm_dst_hash_transfer(struct hlist_head *list, |
359 | struct hlist_head *ndsttable, | |
360 | unsigned int nhashmask) | |
361 | { | |
b791160b | 362 | struct hlist_node *entry, *tmp, *entry0 = NULL; |
2518c7c2 | 363 | struct xfrm_policy *pol; |
b791160b | 364 | unsigned int h0 = 0; |
2518c7c2 | 365 | |
b791160b | 366 | redo: |
2518c7c2 DM |
367 | hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) { |
368 | unsigned int h; | |
369 | ||
370 | h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr, | |
371 | pol->family, nhashmask); | |
b791160b YH |
372 | if (!entry0) { |
373 | hlist_del(entry); | |
374 | hlist_add_head(&pol->bydst, ndsttable+h); | |
375 | h0 = h; | |
376 | } else { | |
377 | if (h != h0) | |
378 | continue; | |
379 | hlist_del(entry); | |
380 | hlist_add_after(entry0, &pol->bydst); | |
381 | } | |
382 | entry0 = entry; | |
383 | } | |
384 | if (!hlist_empty(list)) { | |
385 | entry0 = NULL; | |
386 | goto redo; | |
2518c7c2 DM |
387 | } |
388 | } | |
389 | ||
390 | static void xfrm_idx_hash_transfer(struct hlist_head *list, | |
391 | struct hlist_head *nidxtable, | |
392 | unsigned int nhashmask) | |
393 | { | |
394 | struct hlist_node *entry, *tmp; | |
395 | struct xfrm_policy *pol; | |
396 | ||
397 | hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) { | |
398 | unsigned int h; | |
399 | ||
400 | h = __idx_hash(pol->index, nhashmask); | |
401 | hlist_add_head(&pol->byidx, nidxtable+h); | |
402 | } | |
403 | } | |
404 | ||
405 | static unsigned long xfrm_new_hash_mask(unsigned int old_hmask) | |
406 | { | |
407 | return ((old_hmask + 1) << 1) - 1; | |
408 | } | |
409 | ||
66caf628 | 410 | static void xfrm_bydst_resize(struct net *net, int dir) |
2518c7c2 | 411 | { |
66caf628 | 412 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
413 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
414 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
66caf628 | 415 | struct hlist_head *odst = net->xfrm.policy_bydst[dir].table; |
44e36b42 | 416 | struct hlist_head *ndst = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
417 | int i; |
418 | ||
419 | if (!ndst) | |
420 | return; | |
421 | ||
422 | write_lock_bh(&xfrm_policy_lock); | |
423 | ||
424 | for (i = hmask; i >= 0; i--) | |
425 | xfrm_dst_hash_transfer(odst + i, ndst, nhashmask); | |
426 | ||
66caf628 AD |
427 | net->xfrm.policy_bydst[dir].table = ndst; |
428 | net->xfrm.policy_bydst[dir].hmask = nhashmask; | |
2518c7c2 DM |
429 | |
430 | write_unlock_bh(&xfrm_policy_lock); | |
431 | ||
44e36b42 | 432 | xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
433 | } |
434 | ||
66caf628 | 435 | static void xfrm_byidx_resize(struct net *net, int total) |
2518c7c2 | 436 | { |
66caf628 | 437 | unsigned int hmask = net->xfrm.policy_idx_hmask; |
2518c7c2 DM |
438 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
439 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
66caf628 | 440 | struct hlist_head *oidx = net->xfrm.policy_byidx; |
44e36b42 | 441 | struct hlist_head *nidx = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
442 | int i; |
443 | ||
444 | if (!nidx) | |
445 | return; | |
446 | ||
447 | write_lock_bh(&xfrm_policy_lock); | |
448 | ||
449 | for (i = hmask; i >= 0; i--) | |
450 | xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask); | |
451 | ||
66caf628 AD |
452 | net->xfrm.policy_byidx = nidx; |
453 | net->xfrm.policy_idx_hmask = nhashmask; | |
2518c7c2 DM |
454 | |
455 | write_unlock_bh(&xfrm_policy_lock); | |
456 | ||
44e36b42 | 457 | xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
458 | } |
459 | ||
66caf628 | 460 | static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total) |
2518c7c2 | 461 | { |
66caf628 AD |
462 | unsigned int cnt = net->xfrm.policy_count[dir]; |
463 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; | |
2518c7c2 DM |
464 | |
465 | if (total) | |
466 | *total += cnt; | |
467 | ||
468 | if ((hmask + 1) < xfrm_policy_hashmax && | |
469 | cnt > hmask) | |
470 | return 1; | |
471 | ||
472 | return 0; | |
473 | } | |
474 | ||
66caf628 | 475 | static inline int xfrm_byidx_should_resize(struct net *net, int total) |
2518c7c2 | 476 | { |
66caf628 | 477 | unsigned int hmask = net->xfrm.policy_idx_hmask; |
2518c7c2 DM |
478 | |
479 | if ((hmask + 1) < xfrm_policy_hashmax && | |
480 | total > hmask) | |
481 | return 1; | |
482 | ||
483 | return 0; | |
484 | } | |
485 | ||
e071041b | 486 | void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si) |
ecfd6b18 JHS |
487 | { |
488 | read_lock_bh(&xfrm_policy_lock); | |
e071041b AD |
489 | si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN]; |
490 | si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT]; | |
491 | si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD]; | |
492 | si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX]; | |
493 | si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX]; | |
494 | si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX]; | |
495 | si->spdhcnt = net->xfrm.policy_idx_hmask; | |
ecfd6b18 JHS |
496 | si->spdhmcnt = xfrm_policy_hashmax; |
497 | read_unlock_bh(&xfrm_policy_lock); | |
498 | } | |
499 | EXPORT_SYMBOL(xfrm_spd_getinfo); | |
2518c7c2 | 500 | |
ecfd6b18 | 501 | static DEFINE_MUTEX(hash_resize_mutex); |
66caf628 | 502 | static void xfrm_hash_resize(struct work_struct *work) |
2518c7c2 | 503 | { |
66caf628 | 504 | struct net *net = container_of(work, struct net, xfrm.policy_hash_work); |
2518c7c2 DM |
505 | int dir, total; |
506 | ||
507 | mutex_lock(&hash_resize_mutex); | |
508 | ||
509 | total = 0; | |
510 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
66caf628 AD |
511 | if (xfrm_bydst_should_resize(net, dir, &total)) |
512 | xfrm_bydst_resize(net, dir); | |
2518c7c2 | 513 | } |
66caf628 AD |
514 | if (xfrm_byidx_should_resize(net, total)) |
515 | xfrm_byidx_resize(net, total); | |
2518c7c2 DM |
516 | |
517 | mutex_unlock(&hash_resize_mutex); | |
518 | } | |
519 | ||
1da177e4 LT |
520 | /* Generate new index... KAME seems to generate them ordered by cost |
521 | * of an absolute inpredictability of ordering of rules. This will not pass. */ | |
1121994c | 522 | static u32 xfrm_gen_index(struct net *net, int dir) |
1da177e4 | 523 | { |
1da177e4 LT |
524 | static u32 idx_generator; |
525 | ||
526 | for (;;) { | |
2518c7c2 DM |
527 | struct hlist_node *entry; |
528 | struct hlist_head *list; | |
529 | struct xfrm_policy *p; | |
530 | u32 idx; | |
531 | int found; | |
532 | ||
1da177e4 LT |
533 | idx = (idx_generator | dir); |
534 | idx_generator += 8; | |
535 | if (idx == 0) | |
536 | idx = 8; | |
1121994c | 537 | list = net->xfrm.policy_byidx + idx_hash(net, idx); |
2518c7c2 DM |
538 | found = 0; |
539 | hlist_for_each_entry(p, entry, list, byidx) { | |
540 | if (p->index == idx) { | |
541 | found = 1; | |
1da177e4 | 542 | break; |
2518c7c2 | 543 | } |
1da177e4 | 544 | } |
2518c7c2 | 545 | if (!found) |
1da177e4 LT |
546 | return idx; |
547 | } | |
548 | } | |
549 | ||
2518c7c2 DM |
550 | static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2) |
551 | { | |
552 | u32 *p1 = (u32 *) s1; | |
553 | u32 *p2 = (u32 *) s2; | |
554 | int len = sizeof(struct xfrm_selector) / sizeof(u32); | |
555 | int i; | |
556 | ||
557 | for (i = 0; i < len; i++) { | |
558 | if (p1[i] != p2[i]) | |
559 | return 1; | |
560 | } | |
561 | ||
562 | return 0; | |
563 | } | |
564 | ||
1da177e4 LT |
565 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) |
566 | { | |
1121994c | 567 | struct net *net = xp_net(policy); |
2518c7c2 DM |
568 | struct xfrm_policy *pol; |
569 | struct xfrm_policy *delpol; | |
570 | struct hlist_head *chain; | |
a6c7ab55 | 571 | struct hlist_node *entry, *newpos; |
34f8d884 | 572 | u32 mark = policy->mark.v & policy->mark.m; |
1da177e4 LT |
573 | |
574 | write_lock_bh(&xfrm_policy_lock); | |
1121994c | 575 | chain = policy_hash_bysel(net, &policy->selector, policy->family, dir); |
2518c7c2 DM |
576 | delpol = NULL; |
577 | newpos = NULL; | |
2518c7c2 | 578 | hlist_for_each_entry(pol, entry, chain, bydst) { |
a6c7ab55 | 579 | if (pol->type == policy->type && |
2518c7c2 | 580 | !selector_cmp(&pol->selector, &policy->selector) && |
34f8d884 | 581 | (mark & pol->mark.m) == pol->mark.v && |
a6c7ab55 HX |
582 | xfrm_sec_ctx_match(pol->security, policy->security) && |
583 | !WARN_ON(delpol)) { | |
1da177e4 LT |
584 | if (excl) { |
585 | write_unlock_bh(&xfrm_policy_lock); | |
586 | return -EEXIST; | |
587 | } | |
1da177e4 LT |
588 | delpol = pol; |
589 | if (policy->priority > pol->priority) | |
590 | continue; | |
591 | } else if (policy->priority >= pol->priority) { | |
a6c7ab55 | 592 | newpos = &pol->bydst; |
1da177e4 LT |
593 | continue; |
594 | } | |
1da177e4 LT |
595 | if (delpol) |
596 | break; | |
1da177e4 LT |
597 | } |
598 | if (newpos) | |
2518c7c2 DM |
599 | hlist_add_after(newpos, &policy->bydst); |
600 | else | |
601 | hlist_add_head(&policy->bydst, chain); | |
1da177e4 | 602 | xfrm_pol_hold(policy); |
1121994c | 603 | net->xfrm.policy_count[dir]++; |
1da177e4 | 604 | atomic_inc(&flow_cache_genid); |
ee8372dd | 605 | rt_genid_bump(net); |
29fa0b30 WY |
606 | if (delpol) |
607 | __xfrm_policy_unlink(delpol, dir); | |
1121994c AD |
608 | policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir); |
609 | hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index)); | |
9d729f72 | 610 | policy->curlft.add_time = get_seconds(); |
1da177e4 LT |
611 | policy->curlft.use_time = 0; |
612 | if (!mod_timer(&policy->timer, jiffies + HZ)) | |
613 | xfrm_pol_hold(policy); | |
1121994c | 614 | list_add(&policy->walk.all, &net->xfrm.policy_all); |
1da177e4 LT |
615 | write_unlock_bh(&xfrm_policy_lock); |
616 | ||
9b78a82c | 617 | if (delpol) |
1da177e4 | 618 | xfrm_policy_kill(delpol); |
1121994c AD |
619 | else if (xfrm_bydst_should_resize(net, dir, NULL)) |
620 | schedule_work(&net->xfrm.policy_hash_work); | |
9b78a82c | 621 | |
1da177e4 LT |
622 | return 0; |
623 | } | |
624 | EXPORT_SYMBOL(xfrm_policy_insert); | |
625 | ||
8ca2e93b JHS |
626 | struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type, |
627 | int dir, struct xfrm_selector *sel, | |
ef41aaa0 EP |
628 | struct xfrm_sec_ctx *ctx, int delete, |
629 | int *err) | |
1da177e4 | 630 | { |
2518c7c2 DM |
631 | struct xfrm_policy *pol, *ret; |
632 | struct hlist_head *chain; | |
633 | struct hlist_node *entry; | |
1da177e4 | 634 | |
ef41aaa0 | 635 | *err = 0; |
1da177e4 | 636 | write_lock_bh(&xfrm_policy_lock); |
8d1211a6 | 637 | chain = policy_hash_bysel(net, sel, sel->family, dir); |
2518c7c2 DM |
638 | ret = NULL; |
639 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
640 | if (pol->type == type && | |
34f8d884 | 641 | (mark & pol->mark.m) == pol->mark.v && |
2518c7c2 DM |
642 | !selector_cmp(sel, &pol->selector) && |
643 | xfrm_sec_ctx_match(ctx, pol->security)) { | |
1da177e4 | 644 | xfrm_pol_hold(pol); |
2518c7c2 | 645 | if (delete) { |
03e1ad7b PM |
646 | *err = security_xfrm_policy_delete( |
647 | pol->security); | |
ef41aaa0 EP |
648 | if (*err) { |
649 | write_unlock_bh(&xfrm_policy_lock); | |
650 | return pol; | |
651 | } | |
29fa0b30 | 652 | __xfrm_policy_unlink(pol, dir); |
2518c7c2 DM |
653 | } |
654 | ret = pol; | |
1da177e4 LT |
655 | break; |
656 | } | |
657 | } | |
658 | write_unlock_bh(&xfrm_policy_lock); | |
659 | ||
fe1a5f03 | 660 | if (ret && delete) |
2518c7c2 | 661 | xfrm_policy_kill(ret); |
2518c7c2 | 662 | return ret; |
1da177e4 | 663 | } |
df71837d | 664 | EXPORT_SYMBOL(xfrm_policy_bysel_ctx); |
1da177e4 | 665 | |
8ca2e93b JHS |
666 | struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type, |
667 | int dir, u32 id, int delete, int *err) | |
1da177e4 | 668 | { |
2518c7c2 DM |
669 | struct xfrm_policy *pol, *ret; |
670 | struct hlist_head *chain; | |
671 | struct hlist_node *entry; | |
1da177e4 | 672 | |
b5505c6e HX |
673 | *err = -ENOENT; |
674 | if (xfrm_policy_id2dir(id) != dir) | |
675 | return NULL; | |
676 | ||
ef41aaa0 | 677 | *err = 0; |
1da177e4 | 678 | write_lock_bh(&xfrm_policy_lock); |
8d1211a6 | 679 | chain = net->xfrm.policy_byidx + idx_hash(net, id); |
2518c7c2 DM |
680 | ret = NULL; |
681 | hlist_for_each_entry(pol, entry, chain, byidx) { | |
34f8d884 JHS |
682 | if (pol->type == type && pol->index == id && |
683 | (mark & pol->mark.m) == pol->mark.v) { | |
1da177e4 | 684 | xfrm_pol_hold(pol); |
2518c7c2 | 685 | if (delete) { |
03e1ad7b PM |
686 | *err = security_xfrm_policy_delete( |
687 | pol->security); | |
ef41aaa0 EP |
688 | if (*err) { |
689 | write_unlock_bh(&xfrm_policy_lock); | |
690 | return pol; | |
691 | } | |
29fa0b30 | 692 | __xfrm_policy_unlink(pol, dir); |
2518c7c2 DM |
693 | } |
694 | ret = pol; | |
1da177e4 LT |
695 | break; |
696 | } | |
697 | } | |
698 | write_unlock_bh(&xfrm_policy_lock); | |
699 | ||
fe1a5f03 | 700 | if (ret && delete) |
2518c7c2 | 701 | xfrm_policy_kill(ret); |
2518c7c2 | 702 | return ret; |
1da177e4 LT |
703 | } |
704 | EXPORT_SYMBOL(xfrm_policy_byid); | |
705 | ||
4aa2e62c JL |
706 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
707 | static inline int | |
33ffbbd5 | 708 | xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info) |
1da177e4 | 709 | { |
4aa2e62c JL |
710 | int dir, err = 0; |
711 | ||
712 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { | |
713 | struct xfrm_policy *pol; | |
714 | struct hlist_node *entry; | |
715 | int i; | |
716 | ||
717 | hlist_for_each_entry(pol, entry, | |
33ffbbd5 | 718 | &net->xfrm.policy_inexact[dir], bydst) { |
4aa2e62c JL |
719 | if (pol->type != type) |
720 | continue; | |
03e1ad7b | 721 | err = security_xfrm_policy_delete(pol->security); |
4aa2e62c | 722 | if (err) { |
ab5f5e8b JL |
723 | xfrm_audit_policy_delete(pol, 0, |
724 | audit_info->loginuid, | |
2532386f | 725 | audit_info->sessionid, |
ab5f5e8b | 726 | audit_info->secid); |
4aa2e62c JL |
727 | return err; |
728 | } | |
7dc12d6d | 729 | } |
33ffbbd5 | 730 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { |
4aa2e62c | 731 | hlist_for_each_entry(pol, entry, |
33ffbbd5 | 732 | net->xfrm.policy_bydst[dir].table + i, |
4aa2e62c JL |
733 | bydst) { |
734 | if (pol->type != type) | |
735 | continue; | |
03e1ad7b PM |
736 | err = security_xfrm_policy_delete( |
737 | pol->security); | |
4aa2e62c | 738 | if (err) { |
ab5f5e8b JL |
739 | xfrm_audit_policy_delete(pol, 0, |
740 | audit_info->loginuid, | |
2532386f | 741 | audit_info->sessionid, |
ab5f5e8b | 742 | audit_info->secid); |
4aa2e62c JL |
743 | return err; |
744 | } | |
745 | } | |
746 | } | |
747 | } | |
748 | return err; | |
749 | } | |
750 | #else | |
751 | static inline int | |
33ffbbd5 | 752 | xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info) |
4aa2e62c JL |
753 | { |
754 | return 0; | |
755 | } | |
756 | #endif | |
757 | ||
33ffbbd5 | 758 | int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info) |
4aa2e62c | 759 | { |
2f1eb65f | 760 | int dir, err = 0, cnt = 0; |
1da177e4 LT |
761 | |
762 | write_lock_bh(&xfrm_policy_lock); | |
4aa2e62c | 763 | |
33ffbbd5 | 764 | err = xfrm_policy_flush_secctx_check(net, type, audit_info); |
4aa2e62c JL |
765 | if (err) |
766 | goto out; | |
767 | ||
1da177e4 | 768 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
2518c7c2 DM |
769 | struct xfrm_policy *pol; |
770 | struct hlist_node *entry; | |
29fa0b30 | 771 | int i; |
2518c7c2 DM |
772 | |
773 | again1: | |
774 | hlist_for_each_entry(pol, entry, | |
33ffbbd5 | 775 | &net->xfrm.policy_inexact[dir], bydst) { |
2518c7c2 DM |
776 | if (pol->type != type) |
777 | continue; | |
ea2dea9d | 778 | __xfrm_policy_unlink(pol, dir); |
1da177e4 | 779 | write_unlock_bh(&xfrm_policy_lock); |
ea2dea9d | 780 | cnt++; |
1da177e4 | 781 | |
ab5f5e8b | 782 | xfrm_audit_policy_delete(pol, 1, audit_info->loginuid, |
2532386f | 783 | audit_info->sessionid, |
ab5f5e8b | 784 | audit_info->secid); |
161a09e7 | 785 | |
2518c7c2 | 786 | xfrm_policy_kill(pol); |
1da177e4 LT |
787 | |
788 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
789 | goto again1; |
790 | } | |
791 | ||
33ffbbd5 | 792 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { |
2518c7c2 DM |
793 | again2: |
794 | hlist_for_each_entry(pol, entry, | |
33ffbbd5 | 795 | net->xfrm.policy_bydst[dir].table + i, |
2518c7c2 DM |
796 | bydst) { |
797 | if (pol->type != type) | |
798 | continue; | |
ea2dea9d | 799 | __xfrm_policy_unlink(pol, dir); |
2518c7c2 | 800 | write_unlock_bh(&xfrm_policy_lock); |
ea2dea9d | 801 | cnt++; |
2518c7c2 | 802 | |
ab5f5e8b JL |
803 | xfrm_audit_policy_delete(pol, 1, |
804 | audit_info->loginuid, | |
2532386f | 805 | audit_info->sessionid, |
ab5f5e8b | 806 | audit_info->secid); |
2518c7c2 DM |
807 | xfrm_policy_kill(pol); |
808 | ||
809 | write_lock_bh(&xfrm_policy_lock); | |
810 | goto again2; | |
811 | } | |
1da177e4 | 812 | } |
2518c7c2 | 813 | |
1da177e4 | 814 | } |
2f1eb65f JHS |
815 | if (!cnt) |
816 | err = -ESRCH; | |
4aa2e62c | 817 | out: |
1da177e4 | 818 | write_unlock_bh(&xfrm_policy_lock); |
4aa2e62c | 819 | return err; |
1da177e4 LT |
820 | } |
821 | EXPORT_SYMBOL(xfrm_policy_flush); | |
822 | ||
cdcbca7c | 823 | int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, |
4c563f76 | 824 | int (*func)(struct xfrm_policy *, int, int, void*), |
1da177e4 LT |
825 | void *data) |
826 | { | |
12a169e7 HX |
827 | struct xfrm_policy *pol; |
828 | struct xfrm_policy_walk_entry *x; | |
4c563f76 TT |
829 | int error = 0; |
830 | ||
831 | if (walk->type >= XFRM_POLICY_TYPE_MAX && | |
832 | walk->type != XFRM_POLICY_TYPE_ANY) | |
833 | return -EINVAL; | |
1da177e4 | 834 | |
12a169e7 | 835 | if (list_empty(&walk->walk.all) && walk->seq != 0) |
4c563f76 TT |
836 | return 0; |
837 | ||
12a169e7 HX |
838 | write_lock_bh(&xfrm_policy_lock); |
839 | if (list_empty(&walk->walk.all)) | |
cdcbca7c | 840 | x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all); |
12a169e7 HX |
841 | else |
842 | x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all); | |
cdcbca7c | 843 | list_for_each_entry_from(x, &net->xfrm.policy_all, all) { |
12a169e7 | 844 | if (x->dead) |
4c563f76 | 845 | continue; |
12a169e7 HX |
846 | pol = container_of(x, struct xfrm_policy, walk); |
847 | if (walk->type != XFRM_POLICY_TYPE_ANY && | |
848 | walk->type != pol->type) | |
849 | continue; | |
850 | error = func(pol, xfrm_policy_id2dir(pol->index), | |
851 | walk->seq, data); | |
852 | if (error) { | |
853 | list_move_tail(&walk->walk.all, &x->all); | |
854 | goto out; | |
2518c7c2 | 855 | } |
12a169e7 | 856 | walk->seq++; |
1da177e4 | 857 | } |
12a169e7 | 858 | if (walk->seq == 0) { |
baf5d743 JHS |
859 | error = -ENOENT; |
860 | goto out; | |
861 | } | |
12a169e7 | 862 | list_del_init(&walk->walk.all); |
1da177e4 | 863 | out: |
12a169e7 | 864 | write_unlock_bh(&xfrm_policy_lock); |
1da177e4 LT |
865 | return error; |
866 | } | |
867 | EXPORT_SYMBOL(xfrm_policy_walk); | |
868 | ||
12a169e7 HX |
869 | void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type) |
870 | { | |
871 | INIT_LIST_HEAD(&walk->walk.all); | |
872 | walk->walk.dead = 1; | |
873 | walk->type = type; | |
874 | walk->seq = 0; | |
875 | } | |
876 | EXPORT_SYMBOL(xfrm_policy_walk_init); | |
877 | ||
878 | void xfrm_policy_walk_done(struct xfrm_policy_walk *walk) | |
879 | { | |
880 | if (list_empty(&walk->walk.all)) | |
881 | return; | |
882 | ||
883 | write_lock_bh(&xfrm_policy_lock); | |
884 | list_del(&walk->walk.all); | |
885 | write_unlock_bh(&xfrm_policy_lock); | |
886 | } | |
887 | EXPORT_SYMBOL(xfrm_policy_walk_done); | |
888 | ||
134b0fc5 JM |
889 | /* |
890 | * Find policy to apply to this flow. | |
891 | * | |
892 | * Returns 0 if policy found, else an -errno. | |
893 | */ | |
f299d557 DM |
894 | static int xfrm_policy_match(const struct xfrm_policy *pol, |
895 | const struct flowi *fl, | |
2518c7c2 | 896 | u8 type, u16 family, int dir) |
1da177e4 | 897 | { |
f299d557 | 898 | const struct xfrm_selector *sel = &pol->selector; |
bc9b35ad DM |
899 | int ret = -ESRCH; |
900 | bool match; | |
1da177e4 | 901 | |
2518c7c2 | 902 | if (pol->family != family || |
1d28f42c | 903 | (fl->flowi_mark & pol->mark.m) != pol->mark.v || |
2518c7c2 | 904 | pol->type != type) |
134b0fc5 | 905 | return ret; |
1da177e4 | 906 | |
2518c7c2 | 907 | match = xfrm_selector_match(sel, fl, family); |
134b0fc5 | 908 | if (match) |
1d28f42c | 909 | ret = security_xfrm_policy_lookup(pol->security, fl->flowi_secid, |
03e1ad7b | 910 | dir); |
2518c7c2 | 911 | |
134b0fc5 | 912 | return ret; |
2518c7c2 | 913 | } |
1da177e4 | 914 | |
52479b62 | 915 | static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type, |
062cdb43 | 916 | const struct flowi *fl, |
2518c7c2 DM |
917 | u16 family, u8 dir) |
918 | { | |
134b0fc5 | 919 | int err; |
2518c7c2 | 920 | struct xfrm_policy *pol, *ret; |
0b597e7e | 921 | const xfrm_address_t *daddr, *saddr; |
2518c7c2 DM |
922 | struct hlist_node *entry; |
923 | struct hlist_head *chain; | |
acba48e1 | 924 | u32 priority = ~0U; |
df71837d | 925 | |
2518c7c2 DM |
926 | daddr = xfrm_flowi_daddr(fl, family); |
927 | saddr = xfrm_flowi_saddr(fl, family); | |
928 | if (unlikely(!daddr || !saddr)) | |
929 | return NULL; | |
930 | ||
931 | read_lock_bh(&xfrm_policy_lock); | |
52479b62 | 932 | chain = policy_hash_direct(net, daddr, saddr, family, dir); |
2518c7c2 DM |
933 | ret = NULL; |
934 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
935 | err = xfrm_policy_match(pol, fl, type, family, dir); |
936 | if (err) { | |
937 | if (err == -ESRCH) | |
938 | continue; | |
939 | else { | |
940 | ret = ERR_PTR(err); | |
941 | goto fail; | |
942 | } | |
943 | } else { | |
2518c7c2 | 944 | ret = pol; |
acba48e1 | 945 | priority = ret->priority; |
2518c7c2 DM |
946 | break; |
947 | } | |
948 | } | |
52479b62 | 949 | chain = &net->xfrm.policy_inexact[dir]; |
acba48e1 | 950 | hlist_for_each_entry(pol, entry, chain, bydst) { |
134b0fc5 JM |
951 | err = xfrm_policy_match(pol, fl, type, family, dir); |
952 | if (err) { | |
953 | if (err == -ESRCH) | |
954 | continue; | |
955 | else { | |
956 | ret = ERR_PTR(err); | |
957 | goto fail; | |
958 | } | |
959 | } else if (pol->priority < priority) { | |
acba48e1 DM |
960 | ret = pol; |
961 | break; | |
1da177e4 LT |
962 | } |
963 | } | |
acba48e1 DM |
964 | if (ret) |
965 | xfrm_pol_hold(ret); | |
134b0fc5 | 966 | fail: |
1da177e4 | 967 | read_unlock_bh(&xfrm_policy_lock); |
4e81bb83 | 968 | |
2518c7c2 | 969 | return ret; |
4e81bb83 MN |
970 | } |
971 | ||
80c802f3 | 972 | static struct xfrm_policy * |
73ff93cd | 973 | __xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir) |
80c802f3 TT |
974 | { |
975 | #ifdef CONFIG_XFRM_SUB_POLICY | |
976 | struct xfrm_policy *pol; | |
977 | ||
978 | pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir); | |
979 | if (pol != NULL) | |
980 | return pol; | |
981 | #endif | |
982 | return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir); | |
983 | } | |
984 | ||
fe1a5f03 | 985 | static struct flow_cache_object * |
dee9f4bc | 986 | xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, |
fe1a5f03 | 987 | u8 dir, struct flow_cache_object *old_obj, void *ctx) |
4e81bb83 MN |
988 | { |
989 | struct xfrm_policy *pol; | |
fe1a5f03 TT |
990 | |
991 | if (old_obj) | |
992 | xfrm_pol_put(container_of(old_obj, struct xfrm_policy, flo)); | |
4e81bb83 | 993 | |
80c802f3 TT |
994 | pol = __xfrm_policy_lookup(net, fl, family, dir); |
995 | if (IS_ERR_OR_NULL(pol)) | |
fe1a5f03 | 996 | return ERR_CAST(pol); |
fe1a5f03 | 997 | |
fe1a5f03 TT |
998 | /* Resolver returns two references: |
999 | * one for cache and one for caller of flow_cache_lookup() */ | |
1000 | xfrm_pol_hold(pol); | |
1001 | ||
1002 | return &pol->flo; | |
1da177e4 LT |
1003 | } |
1004 | ||
df71837d TJ |
1005 | static inline int policy_to_flow_dir(int dir) |
1006 | { | |
1007 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
a716c119 YH |
1008 | XFRM_POLICY_OUT == FLOW_DIR_OUT && |
1009 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
1010 | return dir; | |
1011 | switch (dir) { | |
1012 | default: | |
1013 | case XFRM_POLICY_IN: | |
1014 | return FLOW_DIR_IN; | |
1015 | case XFRM_POLICY_OUT: | |
1016 | return FLOW_DIR_OUT; | |
1017 | case XFRM_POLICY_FWD: | |
1018 | return FLOW_DIR_FWD; | |
3ff50b79 | 1019 | } |
df71837d TJ |
1020 | } |
1021 | ||
dee9f4bc DM |
1022 | static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, |
1023 | const struct flowi *fl) | |
1da177e4 LT |
1024 | { |
1025 | struct xfrm_policy *pol; | |
1026 | ||
1027 | read_lock_bh(&xfrm_policy_lock); | |
1028 | if ((pol = sk->sk_policy[dir]) != NULL) { | |
bc9b35ad DM |
1029 | bool match = xfrm_selector_match(&pol->selector, fl, |
1030 | sk->sk_family); | |
a716c119 | 1031 | int err = 0; |
df71837d | 1032 | |
3bccfbc7 | 1033 | if (match) { |
34f8d884 JHS |
1034 | if ((sk->sk_mark & pol->mark.m) != pol->mark.v) { |
1035 | pol = NULL; | |
1036 | goto out; | |
1037 | } | |
03e1ad7b | 1038 | err = security_xfrm_policy_lookup(pol->security, |
1d28f42c | 1039 | fl->flowi_secid, |
03e1ad7b | 1040 | policy_to_flow_dir(dir)); |
3bccfbc7 VY |
1041 | if (!err) |
1042 | xfrm_pol_hold(pol); | |
1043 | else if (err == -ESRCH) | |
1044 | pol = NULL; | |
1045 | else | |
1046 | pol = ERR_PTR(err); | |
1047 | } else | |
1da177e4 LT |
1048 | pol = NULL; |
1049 | } | |
34f8d884 | 1050 | out: |
1da177e4 LT |
1051 | read_unlock_bh(&xfrm_policy_lock); |
1052 | return pol; | |
1053 | } | |
1054 | ||
1055 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) | |
1056 | { | |
98806f75 | 1057 | struct net *net = xp_net(pol); |
1121994c | 1058 | struct hlist_head *chain = policy_hash_bysel(net, &pol->selector, |
2518c7c2 | 1059 | pol->family, dir); |
4e81bb83 | 1060 | |
98806f75 | 1061 | list_add(&pol->walk.all, &net->xfrm.policy_all); |
2518c7c2 | 1062 | hlist_add_head(&pol->bydst, chain); |
e92303f8 | 1063 | hlist_add_head(&pol->byidx, net->xfrm.policy_byidx+idx_hash(net, pol->index)); |
98806f75 | 1064 | net->xfrm.policy_count[dir]++; |
1da177e4 | 1065 | xfrm_pol_hold(pol); |
2518c7c2 | 1066 | |
98806f75 AD |
1067 | if (xfrm_bydst_should_resize(net, dir, NULL)) |
1068 | schedule_work(&net->xfrm.policy_hash_work); | |
1da177e4 LT |
1069 | } |
1070 | ||
1071 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, | |
1072 | int dir) | |
1073 | { | |
98806f75 AD |
1074 | struct net *net = xp_net(pol); |
1075 | ||
2518c7c2 DM |
1076 | if (hlist_unhashed(&pol->bydst)) |
1077 | return NULL; | |
1da177e4 | 1078 | |
2518c7c2 DM |
1079 | hlist_del(&pol->bydst); |
1080 | hlist_del(&pol->byidx); | |
12a169e7 | 1081 | list_del(&pol->walk.all); |
98806f75 | 1082 | net->xfrm.policy_count[dir]--; |
2518c7c2 DM |
1083 | |
1084 | return pol; | |
1da177e4 LT |
1085 | } |
1086 | ||
4666faab | 1087 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir) |
1da177e4 LT |
1088 | { |
1089 | write_lock_bh(&xfrm_policy_lock); | |
1090 | pol = __xfrm_policy_unlink(pol, dir); | |
1091 | write_unlock_bh(&xfrm_policy_lock); | |
1092 | if (pol) { | |
1da177e4 | 1093 | xfrm_policy_kill(pol); |
4666faab | 1094 | return 0; |
1da177e4 | 1095 | } |
4666faab | 1096 | return -ENOENT; |
1da177e4 | 1097 | } |
a70fcb0b | 1098 | EXPORT_SYMBOL(xfrm_policy_delete); |
1da177e4 LT |
1099 | |
1100 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) | |
1101 | { | |
1121994c | 1102 | struct net *net = xp_net(pol); |
1da177e4 LT |
1103 | struct xfrm_policy *old_pol; |
1104 | ||
4e81bb83 MN |
1105 | #ifdef CONFIG_XFRM_SUB_POLICY |
1106 | if (pol && pol->type != XFRM_POLICY_TYPE_MAIN) | |
1107 | return -EINVAL; | |
1108 | #endif | |
1109 | ||
1da177e4 LT |
1110 | write_lock_bh(&xfrm_policy_lock); |
1111 | old_pol = sk->sk_policy[dir]; | |
1112 | sk->sk_policy[dir] = pol; | |
1113 | if (pol) { | |
9d729f72 | 1114 | pol->curlft.add_time = get_seconds(); |
1121994c | 1115 | pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir); |
1da177e4 LT |
1116 | __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir); |
1117 | } | |
1118 | if (old_pol) | |
ea2dea9d TT |
1119 | /* Unlinking succeeds always. This is the only function |
1120 | * allowed to delete or replace socket policy. | |
1121 | */ | |
1da177e4 LT |
1122 | __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir); |
1123 | write_unlock_bh(&xfrm_policy_lock); | |
1124 | ||
1125 | if (old_pol) { | |
1126 | xfrm_policy_kill(old_pol); | |
1127 | } | |
1128 | return 0; | |
1129 | } | |
1130 | ||
d3e40a9f | 1131 | static struct xfrm_policy *clone_policy(const struct xfrm_policy *old, int dir) |
1da177e4 | 1132 | { |
0331b1f3 | 1133 | struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC); |
1da177e4 LT |
1134 | |
1135 | if (newp) { | |
1136 | newp->selector = old->selector; | |
03e1ad7b PM |
1137 | if (security_xfrm_policy_clone(old->security, |
1138 | &newp->security)) { | |
df71837d TJ |
1139 | kfree(newp); |
1140 | return NULL; /* ENOMEM */ | |
1141 | } | |
1da177e4 LT |
1142 | newp->lft = old->lft; |
1143 | newp->curlft = old->curlft; | |
fb977e2c | 1144 | newp->mark = old->mark; |
1da177e4 LT |
1145 | newp->action = old->action; |
1146 | newp->flags = old->flags; | |
1147 | newp->xfrm_nr = old->xfrm_nr; | |
1148 | newp->index = old->index; | |
4e81bb83 | 1149 | newp->type = old->type; |
1da177e4 LT |
1150 | memcpy(newp->xfrm_vec, old->xfrm_vec, |
1151 | newp->xfrm_nr*sizeof(struct xfrm_tmpl)); | |
1152 | write_lock_bh(&xfrm_policy_lock); | |
1153 | __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir); | |
1154 | write_unlock_bh(&xfrm_policy_lock); | |
1155 | xfrm_pol_put(newp); | |
1156 | } | |
1157 | return newp; | |
1158 | } | |
1159 | ||
1160 | int __xfrm_sk_clone_policy(struct sock *sk) | |
1161 | { | |
1162 | struct xfrm_policy *p0 = sk->sk_policy[0], | |
1163 | *p1 = sk->sk_policy[1]; | |
1164 | ||
1165 | sk->sk_policy[0] = sk->sk_policy[1] = NULL; | |
1166 | if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL) | |
1167 | return -ENOMEM; | |
1168 | if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL) | |
1169 | return -ENOMEM; | |
1170 | return 0; | |
1171 | } | |
1172 | ||
a1e59abf | 1173 | static int |
fbda33b2 | 1174 | xfrm_get_saddr(struct net *net, xfrm_address_t *local, xfrm_address_t *remote, |
a1e59abf PM |
1175 | unsigned short family) |
1176 | { | |
1177 | int err; | |
1178 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1179 | ||
1180 | if (unlikely(afinfo == NULL)) | |
1181 | return -EINVAL; | |
fbda33b2 | 1182 | err = afinfo->get_saddr(net, local, remote); |
a1e59abf PM |
1183 | xfrm_policy_put_afinfo(afinfo); |
1184 | return err; | |
1185 | } | |
1186 | ||
1da177e4 LT |
1187 | /* Resolve list of templates for the flow, given policy. */ |
1188 | ||
1189 | static int | |
a6c2e611 DM |
1190 | xfrm_tmpl_resolve_one(struct xfrm_policy *policy, const struct flowi *fl, |
1191 | struct xfrm_state **xfrm, unsigned short family) | |
1da177e4 | 1192 | { |
fbda33b2 | 1193 | struct net *net = xp_net(policy); |
1da177e4 LT |
1194 | int nx; |
1195 | int i, error; | |
1196 | xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); | |
1197 | xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); | |
a1e59abf | 1198 | xfrm_address_t tmp; |
1da177e4 LT |
1199 | |
1200 | for (nx=0, i = 0; i < policy->xfrm_nr; i++) { | |
1201 | struct xfrm_state *x; | |
1202 | xfrm_address_t *remote = daddr; | |
1203 | xfrm_address_t *local = saddr; | |
1204 | struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; | |
1205 | ||
48b8d783 JK |
1206 | if (tmpl->mode == XFRM_MODE_TUNNEL || |
1207 | tmpl->mode == XFRM_MODE_BEET) { | |
1da177e4 LT |
1208 | remote = &tmpl->id.daddr; |
1209 | local = &tmpl->saddr; | |
8444cf71 TE |
1210 | if (xfrm_addr_any(local, tmpl->encap_family)) { |
1211 | error = xfrm_get_saddr(net, &tmp, remote, tmpl->encap_family); | |
a1e59abf PM |
1212 | if (error) |
1213 | goto fail; | |
1214 | local = &tmp; | |
1215 | } | |
1da177e4 LT |
1216 | } |
1217 | ||
1218 | x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); | |
1219 | ||
1220 | if (x && x->km.state == XFRM_STATE_VALID) { | |
1221 | xfrm[nx++] = x; | |
1222 | daddr = remote; | |
1223 | saddr = local; | |
1224 | continue; | |
1225 | } | |
1226 | if (x) { | |
1227 | error = (x->km.state == XFRM_STATE_ERROR ? | |
1228 | -EINVAL : -EAGAIN); | |
1229 | xfrm_state_put(x); | |
1230 | } | |
a4322266 | 1231 | else if (error == -ESRCH) |
1232 | error = -EAGAIN; | |
1da177e4 LT |
1233 | |
1234 | if (!tmpl->optional) | |
1235 | goto fail; | |
1236 | } | |
1237 | return nx; | |
1238 | ||
1239 | fail: | |
1240 | for (nx--; nx>=0; nx--) | |
1241 | xfrm_state_put(xfrm[nx]); | |
1242 | return error; | |
1243 | } | |
1244 | ||
4e81bb83 | 1245 | static int |
a6c2e611 DM |
1246 | xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, const struct flowi *fl, |
1247 | struct xfrm_state **xfrm, unsigned short family) | |
4e81bb83 | 1248 | { |
41a49cc3 MN |
1249 | struct xfrm_state *tp[XFRM_MAX_DEPTH]; |
1250 | struct xfrm_state **tpp = (npols > 1) ? tp : xfrm; | |
4e81bb83 MN |
1251 | int cnx = 0; |
1252 | int error; | |
1253 | int ret; | |
1254 | int i; | |
1255 | ||
1256 | for (i = 0; i < npols; i++) { | |
1257 | if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
1258 | error = -ENOBUFS; | |
1259 | goto fail; | |
1260 | } | |
41a49cc3 MN |
1261 | |
1262 | ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family); | |
4e81bb83 MN |
1263 | if (ret < 0) { |
1264 | error = ret; | |
1265 | goto fail; | |
1266 | } else | |
1267 | cnx += ret; | |
1268 | } | |
1269 | ||
41a49cc3 MN |
1270 | /* found states are sorted for outbound processing */ |
1271 | if (npols > 1) | |
1272 | xfrm_state_sort(xfrm, tpp, cnx, family); | |
1273 | ||
4e81bb83 MN |
1274 | return cnx; |
1275 | ||
1276 | fail: | |
1277 | for (cnx--; cnx>=0; cnx--) | |
41a49cc3 | 1278 | xfrm_state_put(tpp[cnx]); |
4e81bb83 MN |
1279 | return error; |
1280 | ||
1281 | } | |
1282 | ||
1da177e4 LT |
1283 | /* Check that the bundle accepts the flow and its components are |
1284 | * still valid. | |
1285 | */ | |
1286 | ||
05d84025 | 1287 | static inline int xfrm_get_tos(const struct flowi *fl, int family) |
25ee3286 HX |
1288 | { |
1289 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1290 | int tos; | |
1da177e4 | 1291 | |
25ee3286 HX |
1292 | if (!afinfo) |
1293 | return -EINVAL; | |
1294 | ||
1295 | tos = afinfo->get_tos(fl); | |
1296 | ||
1297 | xfrm_policy_put_afinfo(afinfo); | |
1298 | ||
1299 | return tos; | |
1300 | } | |
1301 | ||
80c802f3 TT |
1302 | static struct flow_cache_object *xfrm_bundle_flo_get(struct flow_cache_object *flo) |
1303 | { | |
1304 | struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); | |
1305 | struct dst_entry *dst = &xdst->u.dst; | |
1306 | ||
1307 | if (xdst->route == NULL) { | |
1308 | /* Dummy bundle - if it has xfrms we were not | |
1309 | * able to build bundle as template resolution failed. | |
1310 | * It means we need to try again resolving. */ | |
1311 | if (xdst->num_xfrms > 0) | |
1312 | return NULL; | |
1313 | } else { | |
1314 | /* Real bundle */ | |
1315 | if (stale_bundle(dst)) | |
1316 | return NULL; | |
1317 | } | |
1318 | ||
1319 | dst_hold(dst); | |
1320 | return flo; | |
1321 | } | |
1322 | ||
1323 | static int xfrm_bundle_flo_check(struct flow_cache_object *flo) | |
1324 | { | |
1325 | struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); | |
1326 | struct dst_entry *dst = &xdst->u.dst; | |
1327 | ||
1328 | if (!xdst->route) | |
1329 | return 0; | |
1330 | if (stale_bundle(dst)) | |
1331 | return 0; | |
1332 | ||
1333 | return 1; | |
1334 | } | |
1335 | ||
1336 | static void xfrm_bundle_flo_delete(struct flow_cache_object *flo) | |
1337 | { | |
1338 | struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); | |
1339 | struct dst_entry *dst = &xdst->u.dst; | |
1340 | ||
1341 | dst_free(dst); | |
1342 | } | |
1343 | ||
1344 | static const struct flow_cache_ops xfrm_bundle_fc_ops = { | |
1345 | .get = xfrm_bundle_flo_get, | |
1346 | .check = xfrm_bundle_flo_check, | |
1347 | .delete = xfrm_bundle_flo_delete, | |
1348 | }; | |
1349 | ||
d7c7544c | 1350 | static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family) |
1da177e4 | 1351 | { |
1da177e4 | 1352 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
d7c7544c | 1353 | struct dst_ops *dst_ops; |
25ee3286 HX |
1354 | struct xfrm_dst *xdst; |
1355 | ||
1356 | if (!afinfo) | |
1357 | return ERR_PTR(-EINVAL); | |
1358 | ||
d7c7544c AD |
1359 | switch (family) { |
1360 | case AF_INET: | |
1361 | dst_ops = &net->xfrm.xfrm4_dst_ops; | |
1362 | break; | |
dfd56b8b | 1363 | #if IS_ENABLED(CONFIG_IPV6) |
d7c7544c AD |
1364 | case AF_INET6: |
1365 | dst_ops = &net->xfrm.xfrm6_dst_ops; | |
1366 | break; | |
1367 | #endif | |
1368 | default: | |
1369 | BUG(); | |
1370 | } | |
f5b0a874 | 1371 | xdst = dst_alloc(dst_ops, NULL, 0, DST_OBSOLETE_NONE, 0); |
25ee3286 | 1372 | |
d4cae562 | 1373 | if (likely(xdst)) { |
141e369d SK |
1374 | struct dst_entry *dst = &xdst->u.dst; |
1375 | ||
1376 | memset(dst + 1, 0, sizeof(*xdst) - sizeof(*dst)); | |
0b150932 | 1377 | xdst->flo.ops = &xfrm_bundle_fc_ops; |
9d7b0fc1 PM |
1378 | if (afinfo->init_dst) |
1379 | afinfo->init_dst(net, xdst); | |
d4cae562 | 1380 | } else |
0b150932 | 1381 | xdst = ERR_PTR(-ENOBUFS); |
80c802f3 | 1382 | |
d4cae562 MB |
1383 | xfrm_policy_put_afinfo(afinfo); |
1384 | ||
25ee3286 HX |
1385 | return xdst; |
1386 | } | |
1387 | ||
a1b05140 MN |
1388 | static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst, |
1389 | int nfheader_len) | |
1390 | { | |
1391 | struct xfrm_policy_afinfo *afinfo = | |
1392 | xfrm_policy_get_afinfo(dst->ops->family); | |
1393 | int err; | |
1394 | ||
1395 | if (!afinfo) | |
1396 | return -EINVAL; | |
1397 | ||
1398 | err = afinfo->init_path(path, dst, nfheader_len); | |
1399 | ||
1400 | xfrm_policy_put_afinfo(afinfo); | |
1401 | ||
1402 | return err; | |
1403 | } | |
1404 | ||
87c1e12b | 1405 | static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev, |
0c7b3eef | 1406 | const struct flowi *fl) |
25ee3286 HX |
1407 | { |
1408 | struct xfrm_policy_afinfo *afinfo = | |
1409 | xfrm_policy_get_afinfo(xdst->u.dst.ops->family); | |
1410 | int err; | |
1411 | ||
1412 | if (!afinfo) | |
1da177e4 | 1413 | return -EINVAL; |
25ee3286 | 1414 | |
87c1e12b | 1415 | err = afinfo->fill_dst(xdst, dev, fl); |
25ee3286 | 1416 | |
1da177e4 | 1417 | xfrm_policy_put_afinfo(afinfo); |
25ee3286 | 1418 | |
1da177e4 LT |
1419 | return err; |
1420 | } | |
1421 | ||
80c802f3 | 1422 | |
25ee3286 HX |
1423 | /* Allocate chain of dst_entry's, attach known xfrm's, calculate |
1424 | * all the metrics... Shortly, bundle a bundle. | |
1425 | */ | |
1426 | ||
1427 | static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy, | |
1428 | struct xfrm_state **xfrm, int nx, | |
98313ada | 1429 | const struct flowi *fl, |
25ee3286 HX |
1430 | struct dst_entry *dst) |
1431 | { | |
d7c7544c | 1432 | struct net *net = xp_net(policy); |
25ee3286 HX |
1433 | unsigned long now = jiffies; |
1434 | struct net_device *dev; | |
43a4dea4 | 1435 | struct xfrm_mode *inner_mode; |
25ee3286 HX |
1436 | struct dst_entry *dst_prev = NULL; |
1437 | struct dst_entry *dst0 = NULL; | |
1438 | int i = 0; | |
1439 | int err; | |
1440 | int header_len = 0; | |
a1b05140 | 1441 | int nfheader_len = 0; |
25ee3286 HX |
1442 | int trailer_len = 0; |
1443 | int tos; | |
1444 | int family = policy->selector.family; | |
9bb182a7 YH |
1445 | xfrm_address_t saddr, daddr; |
1446 | ||
1447 | xfrm_flowi_addr_get(fl, &saddr, &daddr, family); | |
25ee3286 HX |
1448 | |
1449 | tos = xfrm_get_tos(fl, family); | |
1450 | err = tos; | |
1451 | if (tos < 0) | |
1452 | goto put_states; | |
1453 | ||
1454 | dst_hold(dst); | |
1455 | ||
1456 | for (; i < nx; i++) { | |
d7c7544c | 1457 | struct xfrm_dst *xdst = xfrm_alloc_dst(net, family); |
25ee3286 HX |
1458 | struct dst_entry *dst1 = &xdst->u.dst; |
1459 | ||
1460 | err = PTR_ERR(xdst); | |
1461 | if (IS_ERR(xdst)) { | |
1462 | dst_release(dst); | |
1463 | goto put_states; | |
1464 | } | |
1465 | ||
43a4dea4 SK |
1466 | if (xfrm[i]->sel.family == AF_UNSPEC) { |
1467 | inner_mode = xfrm_ip2inner_mode(xfrm[i], | |
1468 | xfrm_af2proto(family)); | |
1469 | if (!inner_mode) { | |
1470 | err = -EAFNOSUPPORT; | |
1471 | dst_release(dst); | |
1472 | goto put_states; | |
1473 | } | |
1474 | } else | |
1475 | inner_mode = xfrm[i]->inner_mode; | |
1476 | ||
25ee3286 HX |
1477 | if (!dst_prev) |
1478 | dst0 = dst1; | |
1479 | else { | |
1480 | dst_prev->child = dst_clone(dst1); | |
1481 | dst1->flags |= DST_NOHASH; | |
1482 | } | |
1483 | ||
1484 | xdst->route = dst; | |
defb3519 | 1485 | dst_copy_metrics(dst1, dst); |
25ee3286 HX |
1486 | |
1487 | if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) { | |
1488 | family = xfrm[i]->props.family; | |
9bb182a7 YH |
1489 | dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr, |
1490 | family); | |
25ee3286 HX |
1491 | err = PTR_ERR(dst); |
1492 | if (IS_ERR(dst)) | |
1493 | goto put_states; | |
1494 | } else | |
1495 | dst_hold(dst); | |
1496 | ||
1497 | dst1->xfrm = xfrm[i]; | |
80c802f3 | 1498 | xdst->xfrm_genid = xfrm[i]->genid; |
25ee3286 | 1499 | |
f5b0a874 | 1500 | dst1->obsolete = DST_OBSOLETE_FORCE_CHK; |
25ee3286 HX |
1501 | dst1->flags |= DST_HOST; |
1502 | dst1->lastuse = now; | |
1503 | ||
1504 | dst1->input = dst_discard; | |
43a4dea4 | 1505 | dst1->output = inner_mode->afinfo->output; |
25ee3286 HX |
1506 | |
1507 | dst1->next = dst_prev; | |
1508 | dst_prev = dst1; | |
1509 | ||
1510 | header_len += xfrm[i]->props.header_len; | |
a1b05140 MN |
1511 | if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT) |
1512 | nfheader_len += xfrm[i]->props.header_len; | |
25ee3286 HX |
1513 | trailer_len += xfrm[i]->props.trailer_len; |
1514 | } | |
1515 | ||
1516 | dst_prev->child = dst; | |
1517 | dst0->path = dst; | |
1518 | ||
1519 | err = -ENODEV; | |
1520 | dev = dst->dev; | |
1521 | if (!dev) | |
1522 | goto free_dst; | |
1523 | ||
a1b05140 | 1524 | xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len); |
25ee3286 HX |
1525 | xfrm_init_pmtu(dst_prev); |
1526 | ||
1527 | for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) { | |
1528 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev; | |
1529 | ||
87c1e12b | 1530 | err = xfrm_fill_dst(xdst, dev, fl); |
25ee3286 HX |
1531 | if (err) |
1532 | goto free_dst; | |
1533 | ||
1534 | dst_prev->header_len = header_len; | |
1535 | dst_prev->trailer_len = trailer_len; | |
1536 | header_len -= xdst->u.dst.xfrm->props.header_len; | |
1537 | trailer_len -= xdst->u.dst.xfrm->props.trailer_len; | |
1538 | } | |
1539 | ||
1540 | out: | |
1541 | return dst0; | |
1542 | ||
1543 | put_states: | |
1544 | for (; i < nx; i++) | |
1545 | xfrm_state_put(xfrm[i]); | |
1546 | free_dst: | |
1547 | if (dst0) | |
1548 | dst_free(dst0); | |
1549 | dst0 = ERR_PTR(err); | |
1550 | goto out; | |
1551 | } | |
1552 | ||
157bfc25 | 1553 | static int inline |
3f0e18fb | 1554 | xfrm_dst_alloc_copy(void **target, const void *src, int size) |
157bfc25 MN |
1555 | { |
1556 | if (!*target) { | |
1557 | *target = kmalloc(size, GFP_ATOMIC); | |
1558 | if (!*target) | |
1559 | return -ENOMEM; | |
1560 | } | |
1561 | memcpy(*target, src, size); | |
1562 | return 0; | |
1563 | } | |
1564 | ||
1565 | static int inline | |
1786b389 | 1566 | xfrm_dst_update_parent(struct dst_entry *dst, const struct xfrm_selector *sel) |
157bfc25 MN |
1567 | { |
1568 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1569 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1570 | return xfrm_dst_alloc_copy((void **)&(xdst->partner), | |
1571 | sel, sizeof(*sel)); | |
1572 | #else | |
1573 | return 0; | |
1574 | #endif | |
1575 | } | |
1576 | ||
1577 | static int inline | |
3f0e18fb | 1578 | xfrm_dst_update_origin(struct dst_entry *dst, const struct flowi *fl) |
157bfc25 MN |
1579 | { |
1580 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1581 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1582 | return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl)); | |
1583 | #else | |
1584 | return 0; | |
1585 | #endif | |
1586 | } | |
1da177e4 | 1587 | |
73ff93cd | 1588 | static int xfrm_expand_policies(const struct flowi *fl, u16 family, |
80c802f3 TT |
1589 | struct xfrm_policy **pols, |
1590 | int *num_pols, int *num_xfrms) | |
1591 | { | |
1592 | int i; | |
1593 | ||
1594 | if (*num_pols == 0 || !pols[0]) { | |
1595 | *num_pols = 0; | |
1596 | *num_xfrms = 0; | |
1597 | return 0; | |
1598 | } | |
1599 | if (IS_ERR(pols[0])) | |
1600 | return PTR_ERR(pols[0]); | |
1601 | ||
1602 | *num_xfrms = pols[0]->xfrm_nr; | |
1603 | ||
1604 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1605 | if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW && | |
1606 | pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1607 | pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]), | |
1608 | XFRM_POLICY_TYPE_MAIN, | |
1609 | fl, family, | |
1610 | XFRM_POLICY_OUT); | |
1611 | if (pols[1]) { | |
1612 | if (IS_ERR(pols[1])) { | |
1613 | xfrm_pols_put(pols, *num_pols); | |
1614 | return PTR_ERR(pols[1]); | |
1615 | } | |
1616 | (*num_pols) ++; | |
1617 | (*num_xfrms) += pols[1]->xfrm_nr; | |
1618 | } | |
1619 | } | |
1620 | #endif | |
1621 | for (i = 0; i < *num_pols; i++) { | |
1622 | if (pols[i]->action != XFRM_POLICY_ALLOW) { | |
1623 | *num_xfrms = -1; | |
1624 | break; | |
1625 | } | |
1626 | } | |
1627 | ||
1628 | return 0; | |
1629 | ||
1630 | } | |
1631 | ||
1632 | static struct xfrm_dst * | |
1633 | xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols, | |
4ca2e685 | 1634 | const struct flowi *fl, u16 family, |
80c802f3 TT |
1635 | struct dst_entry *dst_orig) |
1636 | { | |
1637 | struct net *net = xp_net(pols[0]); | |
1638 | struct xfrm_state *xfrm[XFRM_MAX_DEPTH]; | |
1639 | struct dst_entry *dst; | |
1640 | struct xfrm_dst *xdst; | |
1641 | int err; | |
1642 | ||
1643 | /* Try to instantiate a bundle */ | |
1644 | err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family); | |
d809ec89 TT |
1645 | if (err <= 0) { |
1646 | if (err != 0 && err != -EAGAIN) | |
80c802f3 TT |
1647 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); |
1648 | return ERR_PTR(err); | |
1649 | } | |
1650 | ||
1651 | dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig); | |
1652 | if (IS_ERR(dst)) { | |
1653 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR); | |
1654 | return ERR_CAST(dst); | |
1655 | } | |
1656 | ||
1657 | xdst = (struct xfrm_dst *)dst; | |
1658 | xdst->num_xfrms = err; | |
1659 | if (num_pols > 1) | |
1660 | err = xfrm_dst_update_parent(dst, &pols[1]->selector); | |
1661 | else | |
1662 | err = xfrm_dst_update_origin(dst, fl); | |
1663 | if (unlikely(err)) { | |
1664 | dst_free(dst); | |
1665 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR); | |
1666 | return ERR_PTR(err); | |
1667 | } | |
1668 | ||
1669 | xdst->num_pols = num_pols; | |
1670 | memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols); | |
1671 | xdst->policy_genid = atomic_read(&pols[0]->genid); | |
1672 | ||
1673 | return xdst; | |
1674 | } | |
1675 | ||
1676 | static struct flow_cache_object * | |
dee9f4bc | 1677 | xfrm_bundle_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir, |
80c802f3 TT |
1678 | struct flow_cache_object *oldflo, void *ctx) |
1679 | { | |
1680 | struct dst_entry *dst_orig = (struct dst_entry *)ctx; | |
1681 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; | |
1682 | struct xfrm_dst *xdst, *new_xdst; | |
1683 | int num_pols = 0, num_xfrms = 0, i, err, pol_dead; | |
1684 | ||
1685 | /* Check if the policies from old bundle are usable */ | |
1686 | xdst = NULL; | |
1687 | if (oldflo) { | |
1688 | xdst = container_of(oldflo, struct xfrm_dst, flo); | |
1689 | num_pols = xdst->num_pols; | |
1690 | num_xfrms = xdst->num_xfrms; | |
1691 | pol_dead = 0; | |
1692 | for (i = 0; i < num_pols; i++) { | |
1693 | pols[i] = xdst->pols[i]; | |
1694 | pol_dead |= pols[i]->walk.dead; | |
1695 | } | |
1696 | if (pol_dead) { | |
1697 | dst_free(&xdst->u.dst); | |
1698 | xdst = NULL; | |
1699 | num_pols = 0; | |
1700 | num_xfrms = 0; | |
1701 | oldflo = NULL; | |
1702 | } | |
1703 | } | |
1704 | ||
1705 | /* Resolve policies to use if we couldn't get them from | |
1706 | * previous cache entry */ | |
1707 | if (xdst == NULL) { | |
1708 | num_pols = 1; | |
1709 | pols[0] = __xfrm_policy_lookup(net, fl, family, dir); | |
1710 | err = xfrm_expand_policies(fl, family, pols, | |
1711 | &num_pols, &num_xfrms); | |
1712 | if (err < 0) | |
1713 | goto inc_error; | |
1714 | if (num_pols == 0) | |
1715 | return NULL; | |
1716 | if (num_xfrms <= 0) | |
1717 | goto make_dummy_bundle; | |
1718 | } | |
1719 | ||
1720 | new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family, dst_orig); | |
1721 | if (IS_ERR(new_xdst)) { | |
1722 | err = PTR_ERR(new_xdst); | |
1723 | if (err != -EAGAIN) | |
1724 | goto error; | |
1725 | if (oldflo == NULL) | |
1726 | goto make_dummy_bundle; | |
1727 | dst_hold(&xdst->u.dst); | |
1728 | return oldflo; | |
d809ec89 TT |
1729 | } else if (new_xdst == NULL) { |
1730 | num_xfrms = 0; | |
1731 | if (oldflo == NULL) | |
1732 | goto make_dummy_bundle; | |
1733 | xdst->num_xfrms = 0; | |
1734 | dst_hold(&xdst->u.dst); | |
1735 | return oldflo; | |
80c802f3 TT |
1736 | } |
1737 | ||
1738 | /* Kill the previous bundle */ | |
1739 | if (xdst) { | |
1740 | /* The policies were stolen for newly generated bundle */ | |
1741 | xdst->num_pols = 0; | |
1742 | dst_free(&xdst->u.dst); | |
1743 | } | |
1744 | ||
1745 | /* Flow cache does not have reference, it dst_free()'s, | |
1746 | * but we do need to return one reference for original caller */ | |
1747 | dst_hold(&new_xdst->u.dst); | |
1748 | return &new_xdst->flo; | |
1749 | ||
1750 | make_dummy_bundle: | |
1751 | /* We found policies, but there's no bundles to instantiate: | |
1752 | * either because the policy blocks, has no transformations or | |
1753 | * we could not build template (no xfrm_states).*/ | |
1754 | xdst = xfrm_alloc_dst(net, family); | |
1755 | if (IS_ERR(xdst)) { | |
1756 | xfrm_pols_put(pols, num_pols); | |
1757 | return ERR_CAST(xdst); | |
1758 | } | |
1759 | xdst->num_pols = num_pols; | |
1760 | xdst->num_xfrms = num_xfrms; | |
1761 | memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols); | |
1762 | ||
1763 | dst_hold(&xdst->u.dst); | |
1764 | return &xdst->flo; | |
1765 | ||
1766 | inc_error: | |
1767 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); | |
1768 | error: | |
1769 | if (xdst != NULL) | |
1770 | dst_free(&xdst->u.dst); | |
1771 | else | |
1772 | xfrm_pols_put(pols, num_pols); | |
1773 | return ERR_PTR(err); | |
1774 | } | |
1da177e4 | 1775 | |
2774c131 DM |
1776 | static struct dst_entry *make_blackhole(struct net *net, u16 family, |
1777 | struct dst_entry *dst_orig) | |
1778 | { | |
1779 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1780 | struct dst_entry *ret; | |
1781 | ||
1782 | if (!afinfo) { | |
1783 | dst_release(dst_orig); | |
433a1954 | 1784 | return ERR_PTR(-EINVAL); |
2774c131 DM |
1785 | } else { |
1786 | ret = afinfo->blackhole_route(net, dst_orig); | |
1787 | } | |
1788 | xfrm_policy_put_afinfo(afinfo); | |
1789 | ||
1790 | return ret; | |
1791 | } | |
1792 | ||
1da177e4 LT |
1793 | /* Main function: finds/creates a bundle for given flow. |
1794 | * | |
1795 | * At the moment we eat a raw IP route. Mostly to speed up lookups | |
1796 | * on interfaces with disabled IPsec. | |
1797 | */ | |
452edd59 DM |
1798 | struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig, |
1799 | const struct flowi *fl, | |
1800 | struct sock *sk, int flags) | |
1da177e4 | 1801 | { |
4e81bb83 | 1802 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
80c802f3 TT |
1803 | struct flow_cache_object *flo; |
1804 | struct xfrm_dst *xdst; | |
452edd59 | 1805 | struct dst_entry *dst, *route; |
80c802f3 | 1806 | u16 family = dst_orig->ops->family; |
df71837d | 1807 | u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT); |
4b021628 | 1808 | int i, err, num_pols, num_xfrms = 0, drop_pols = 0; |
e0d1caa7 | 1809 | |
1da177e4 | 1810 | restart: |
80c802f3 TT |
1811 | dst = NULL; |
1812 | xdst = NULL; | |
1813 | route = NULL; | |
4e81bb83 | 1814 | |
f7944fb1 | 1815 | if (sk && sk->sk_policy[XFRM_POLICY_OUT]) { |
80c802f3 TT |
1816 | num_pols = 1; |
1817 | pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl); | |
1818 | err = xfrm_expand_policies(fl, family, pols, | |
1819 | &num_pols, &num_xfrms); | |
1820 | if (err < 0) | |
75b8c133 | 1821 | goto dropdst; |
80c802f3 TT |
1822 | |
1823 | if (num_pols) { | |
1824 | if (num_xfrms <= 0) { | |
1825 | drop_pols = num_pols; | |
1826 | goto no_transform; | |
1827 | } | |
1828 | ||
1829 | xdst = xfrm_resolve_and_create_bundle( | |
1830 | pols, num_pols, fl, | |
1831 | family, dst_orig); | |
1832 | if (IS_ERR(xdst)) { | |
1833 | xfrm_pols_put(pols, num_pols); | |
1834 | err = PTR_ERR(xdst); | |
1835 | goto dropdst; | |
d809ec89 TT |
1836 | } else if (xdst == NULL) { |
1837 | num_xfrms = 0; | |
1838 | drop_pols = num_pols; | |
1839 | goto no_transform; | |
80c802f3 TT |
1840 | } |
1841 | ||
fbd50608 SK |
1842 | dst_hold(&xdst->u.dst); |
1843 | ||
80c802f3 TT |
1844 | spin_lock_bh(&xfrm_policy_sk_bundle_lock); |
1845 | xdst->u.dst.next = xfrm_policy_sk_bundles; | |
1846 | xfrm_policy_sk_bundles = &xdst->u.dst; | |
1847 | spin_unlock_bh(&xfrm_policy_sk_bundle_lock); | |
1848 | ||
1849 | route = xdst->route; | |
0aa64774 | 1850 | } |
3bccfbc7 | 1851 | } |
1da177e4 | 1852 | |
80c802f3 | 1853 | if (xdst == NULL) { |
1da177e4 | 1854 | /* To accelerate a bit... */ |
2518c7c2 | 1855 | if ((dst_orig->flags & DST_NOXFRM) || |
52479b62 | 1856 | !net->xfrm.policy_count[XFRM_POLICY_OUT]) |
8b7817f3 | 1857 | goto nopol; |
1da177e4 | 1858 | |
80c802f3 TT |
1859 | flo = flow_cache_lookup(net, fl, family, dir, |
1860 | xfrm_bundle_lookup, dst_orig); | |
1861 | if (flo == NULL) | |
1862 | goto nopol; | |
fe1a5f03 | 1863 | if (IS_ERR(flo)) { |
80c802f3 | 1864 | err = PTR_ERR(flo); |
75b8c133 | 1865 | goto dropdst; |
d66e37a9 | 1866 | } |
80c802f3 TT |
1867 | xdst = container_of(flo, struct xfrm_dst, flo); |
1868 | ||
1869 | num_pols = xdst->num_pols; | |
1870 | num_xfrms = xdst->num_xfrms; | |
1871 | memcpy(pols, xdst->pols, sizeof(struct xfrm_policy*) * num_pols); | |
1872 | route = xdst->route; | |
1873 | } | |
1874 | ||
1875 | dst = &xdst->u.dst; | |
1876 | if (route == NULL && num_xfrms > 0) { | |
1877 | /* The only case when xfrm_bundle_lookup() returns a | |
1878 | * bundle with null route, is when the template could | |
1879 | * not be resolved. It means policies are there, but | |
1880 | * bundle could not be created, since we don't yet | |
1881 | * have the xfrm_state's. We need to wait for KM to | |
1882 | * negotiate new SA's or bail out with error.*/ | |
1883 | if (net->xfrm.sysctl_larval_drop) { | |
1884 | /* EREMOTE tells the caller to generate | |
1885 | * a one-shot blackhole route. */ | |
1886 | dst_release(dst); | |
a1aa3483 | 1887 | xfrm_pols_put(pols, drop_pols); |
80c802f3 | 1888 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); |
2774c131 | 1889 | |
452edd59 | 1890 | return make_blackhole(net, family, dst_orig); |
80c802f3 | 1891 | } |
1d28f42c | 1892 | if (fl->flowi_flags & FLOWI_FLAG_CAN_SLEEP) { |
80c802f3 TT |
1893 | DECLARE_WAITQUEUE(wait, current); |
1894 | ||
1895 | add_wait_queue(&net->xfrm.km_waitq, &wait); | |
1896 | set_current_state(TASK_INTERRUPTIBLE); | |
1897 | schedule(); | |
1898 | set_current_state(TASK_RUNNING); | |
1899 | remove_wait_queue(&net->xfrm.km_waitq, &wait); | |
1900 | ||
1901 | if (!signal_pending(current)) { | |
1902 | dst_release(dst); | |
1903 | goto restart; | |
1904 | } | |
1905 | ||
1906 | err = -ERESTART; | |
1907 | } else | |
1908 | err = -EAGAIN; | |
1909 | ||
1910 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); | |
1911 | goto error; | |
1da177e4 LT |
1912 | } |
1913 | ||
80c802f3 TT |
1914 | no_transform: |
1915 | if (num_pols == 0) | |
8b7817f3 | 1916 | goto nopol; |
1da177e4 | 1917 | |
80c802f3 TT |
1918 | if ((flags & XFRM_LOOKUP_ICMP) && |
1919 | !(pols[0]->flags & XFRM_POLICY_ICMP)) { | |
1920 | err = -ENOENT; | |
8b7817f3 | 1921 | goto error; |
80c802f3 | 1922 | } |
8b7817f3 | 1923 | |
80c802f3 TT |
1924 | for (i = 0; i < num_pols; i++) |
1925 | pols[i]->curlft.use_time = get_seconds(); | |
8b7817f3 | 1926 | |
80c802f3 | 1927 | if (num_xfrms < 0) { |
1da177e4 | 1928 | /* Prohibit the flow */ |
59c9940e | 1929 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK); |
e104411b PM |
1930 | err = -EPERM; |
1931 | goto error; | |
80c802f3 TT |
1932 | } else if (num_xfrms > 0) { |
1933 | /* Flow transformed */ | |
80c802f3 TT |
1934 | dst_release(dst_orig); |
1935 | } else { | |
1936 | /* Flow passes untransformed */ | |
1937 | dst_release(dst); | |
452edd59 | 1938 | dst = dst_orig; |
1da177e4 | 1939 | } |
80c802f3 TT |
1940 | ok: |
1941 | xfrm_pols_put(pols, drop_pols); | |
0c183379 G |
1942 | if (dst && dst->xfrm && |
1943 | dst->xfrm->props.mode == XFRM_MODE_TUNNEL) | |
1944 | dst->flags |= DST_XFRM_TUNNEL; | |
452edd59 | 1945 | return dst; |
1da177e4 | 1946 | |
80c802f3 | 1947 | nopol: |
452edd59 DM |
1948 | if (!(flags & XFRM_LOOKUP_ICMP)) { |
1949 | dst = dst_orig; | |
80c802f3 | 1950 | goto ok; |
452edd59 | 1951 | } |
80c802f3 | 1952 | err = -ENOENT; |
1da177e4 | 1953 | error: |
80c802f3 | 1954 | dst_release(dst); |
75b8c133 HX |
1955 | dropdst: |
1956 | dst_release(dst_orig); | |
80c802f3 | 1957 | xfrm_pols_put(pols, drop_pols); |
452edd59 | 1958 | return ERR_PTR(err); |
1da177e4 LT |
1959 | } |
1960 | EXPORT_SYMBOL(xfrm_lookup); | |
1961 | ||
df0ba92a | 1962 | static inline int |
8f029de2 | 1963 | xfrm_secpath_reject(int idx, struct sk_buff *skb, const struct flowi *fl) |
df0ba92a MN |
1964 | { |
1965 | struct xfrm_state *x; | |
df0ba92a MN |
1966 | |
1967 | if (!skb->sp || idx < 0 || idx >= skb->sp->len) | |
1968 | return 0; | |
1969 | x = skb->sp->xvec[idx]; | |
1970 | if (!x->type->reject) | |
1971 | return 0; | |
1ecafede | 1972 | return x->type->reject(x, skb, fl); |
df0ba92a MN |
1973 | } |
1974 | ||
1da177e4 LT |
1975 | /* When skb is transformed back to its "native" form, we have to |
1976 | * check policy restrictions. At the moment we make this in maximally | |
1977 | * stupid way. Shame on me. :-) Of course, connected sockets must | |
1978 | * have policy cached at them. | |
1979 | */ | |
1980 | ||
1981 | static inline int | |
7db454b9 | 1982 | xfrm_state_ok(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, |
1da177e4 LT |
1983 | unsigned short family) |
1984 | { | |
1985 | if (xfrm_state_kern(x)) | |
928ba416 | 1986 | return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family); |
1da177e4 LT |
1987 | return x->id.proto == tmpl->id.proto && |
1988 | (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && | |
1989 | (x->props.reqid == tmpl->reqid || !tmpl->reqid) && | |
1990 | x->props.mode == tmpl->mode && | |
c5d18e98 | 1991 | (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) || |
f3bd4840 | 1992 | !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) && |
7e49e6de MN |
1993 | !(x->props.mode != XFRM_MODE_TRANSPORT && |
1994 | xfrm_state_addr_cmp(tmpl, x, family)); | |
1da177e4 LT |
1995 | } |
1996 | ||
df0ba92a MN |
1997 | /* |
1998 | * 0 or more than 0 is returned when validation is succeeded (either bypass | |
1999 | * because of optional transport mode, or next index of the mathced secpath | |
2000 | * state with the template. | |
2001 | * -1 is returned when no matching template is found. | |
2002 | * Otherwise "-2 - errored_index" is returned. | |
2003 | */ | |
1da177e4 | 2004 | static inline int |
22cccb7e | 2005 | xfrm_policy_ok(const struct xfrm_tmpl *tmpl, const struct sec_path *sp, int start, |
1da177e4 LT |
2006 | unsigned short family) |
2007 | { | |
2008 | int idx = start; | |
2009 | ||
2010 | if (tmpl->optional) { | |
7e49e6de | 2011 | if (tmpl->mode == XFRM_MODE_TRANSPORT) |
1da177e4 LT |
2012 | return start; |
2013 | } else | |
2014 | start = -1; | |
2015 | for (; idx < sp->len; idx++) { | |
dbe5b4aa | 2016 | if (xfrm_state_ok(tmpl, sp->xvec[idx], family)) |
1da177e4 | 2017 | return ++idx; |
df0ba92a MN |
2018 | if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) { |
2019 | if (start == -1) | |
2020 | start = -2-idx; | |
1da177e4 | 2021 | break; |
df0ba92a | 2022 | } |
1da177e4 LT |
2023 | } |
2024 | return start; | |
2025 | } | |
2026 | ||
d5422efe HX |
2027 | int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, |
2028 | unsigned int family, int reverse) | |
1da177e4 LT |
2029 | { |
2030 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
e0d1caa7 | 2031 | int err; |
1da177e4 LT |
2032 | |
2033 | if (unlikely(afinfo == NULL)) | |
2034 | return -EAFNOSUPPORT; | |
2035 | ||
d5422efe | 2036 | afinfo->decode_session(skb, fl, reverse); |
1d28f42c | 2037 | err = security_xfrm_decode_session(skb, &fl->flowi_secid); |
1da177e4 | 2038 | xfrm_policy_put_afinfo(afinfo); |
e0d1caa7 | 2039 | return err; |
1da177e4 | 2040 | } |
d5422efe | 2041 | EXPORT_SYMBOL(__xfrm_decode_session); |
1da177e4 | 2042 | |
9a7386ec | 2043 | static inline int secpath_has_nontransport(const struct sec_path *sp, int k, int *idxp) |
1da177e4 LT |
2044 | { |
2045 | for (; k < sp->len; k++) { | |
df0ba92a | 2046 | if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) { |
d1d9facf | 2047 | *idxp = k; |
1da177e4 | 2048 | return 1; |
df0ba92a | 2049 | } |
1da177e4 LT |
2050 | } |
2051 | ||
2052 | return 0; | |
2053 | } | |
2054 | ||
a716c119 | 2055 | int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, |
1da177e4 LT |
2056 | unsigned short family) |
2057 | { | |
f6e1e25d | 2058 | struct net *net = dev_net(skb->dev); |
1da177e4 | 2059 | struct xfrm_policy *pol; |
4e81bb83 MN |
2060 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
2061 | int npols = 0; | |
2062 | int xfrm_nr; | |
2063 | int pi; | |
d5422efe | 2064 | int reverse; |
1da177e4 | 2065 | struct flowi fl; |
d5422efe | 2066 | u8 fl_dir; |
df0ba92a | 2067 | int xerr_idx = -1; |
1da177e4 | 2068 | |
d5422efe HX |
2069 | reverse = dir & ~XFRM_POLICY_MASK; |
2070 | dir &= XFRM_POLICY_MASK; | |
2071 | fl_dir = policy_to_flow_dir(dir); | |
2072 | ||
0aa64774 | 2073 | if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) { |
59c9940e | 2074 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); |
1da177e4 | 2075 | return 0; |
0aa64774 MN |
2076 | } |
2077 | ||
eb9c7ebe | 2078 | nf_nat_decode_session(skb, &fl, family); |
1da177e4 LT |
2079 | |
2080 | /* First, check used SA against their selectors. */ | |
2081 | if (skb->sp) { | |
2082 | int i; | |
2083 | ||
2084 | for (i=skb->sp->len-1; i>=0; i--) { | |
dbe5b4aa | 2085 | struct xfrm_state *x = skb->sp->xvec[i]; |
0aa64774 | 2086 | if (!xfrm_selector_match(&x->sel, &fl, family)) { |
59c9940e | 2087 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH); |
1da177e4 | 2088 | return 0; |
0aa64774 | 2089 | } |
1da177e4 LT |
2090 | } |
2091 | } | |
2092 | ||
2093 | pol = NULL; | |
3bccfbc7 | 2094 | if (sk && sk->sk_policy[dir]) { |
e0d1caa7 | 2095 | pol = xfrm_sk_policy_lookup(sk, dir, &fl); |
0aa64774 | 2096 | if (IS_ERR(pol)) { |
59c9940e | 2097 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
3bccfbc7 | 2098 | return 0; |
0aa64774 | 2099 | } |
3bccfbc7 | 2100 | } |
1da177e4 | 2101 | |
fe1a5f03 TT |
2102 | if (!pol) { |
2103 | struct flow_cache_object *flo; | |
2104 | ||
2105 | flo = flow_cache_lookup(net, &fl, family, fl_dir, | |
2106 | xfrm_policy_lookup, NULL); | |
2107 | if (IS_ERR_OR_NULL(flo)) | |
2108 | pol = ERR_CAST(flo); | |
2109 | else | |
2110 | pol = container_of(flo, struct xfrm_policy, flo); | |
2111 | } | |
1da177e4 | 2112 | |
0aa64774 | 2113 | if (IS_ERR(pol)) { |
59c9940e | 2114 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
134b0fc5 | 2115 | return 0; |
0aa64774 | 2116 | } |
134b0fc5 | 2117 | |
df0ba92a | 2118 | if (!pol) { |
d1d9facf | 2119 | if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) { |
df0ba92a | 2120 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
59c9940e | 2121 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS); |
df0ba92a MN |
2122 | return 0; |
2123 | } | |
2124 | return 1; | |
2125 | } | |
1da177e4 | 2126 | |
9d729f72 | 2127 | pol->curlft.use_time = get_seconds(); |
1da177e4 | 2128 | |
4e81bb83 MN |
2129 | pols[0] = pol; |
2130 | npols ++; | |
2131 | #ifdef CONFIG_XFRM_SUB_POLICY | |
2132 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
f6e1e25d | 2133 | pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, |
4e81bb83 MN |
2134 | &fl, family, |
2135 | XFRM_POLICY_IN); | |
2136 | if (pols[1]) { | |
0aa64774 | 2137 | if (IS_ERR(pols[1])) { |
59c9940e | 2138 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
134b0fc5 | 2139 | return 0; |
0aa64774 | 2140 | } |
9d729f72 | 2141 | pols[1]->curlft.use_time = get_seconds(); |
4e81bb83 MN |
2142 | npols ++; |
2143 | } | |
2144 | } | |
2145 | #endif | |
2146 | ||
1da177e4 LT |
2147 | if (pol->action == XFRM_POLICY_ALLOW) { |
2148 | struct sec_path *sp; | |
2149 | static struct sec_path dummy; | |
4e81bb83 | 2150 | struct xfrm_tmpl *tp[XFRM_MAX_DEPTH]; |
41a49cc3 | 2151 | struct xfrm_tmpl *stp[XFRM_MAX_DEPTH]; |
4e81bb83 MN |
2152 | struct xfrm_tmpl **tpp = tp; |
2153 | int ti = 0; | |
1da177e4 LT |
2154 | int i, k; |
2155 | ||
2156 | if ((sp = skb->sp) == NULL) | |
2157 | sp = &dummy; | |
2158 | ||
4e81bb83 MN |
2159 | for (pi = 0; pi < npols; pi++) { |
2160 | if (pols[pi] != pol && | |
0aa64774 | 2161 | pols[pi]->action != XFRM_POLICY_ALLOW) { |
59c9940e | 2162 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); |
4e81bb83 | 2163 | goto reject; |
0aa64774 MN |
2164 | } |
2165 | if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
59c9940e | 2166 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); |
4e81bb83 | 2167 | goto reject_error; |
0aa64774 | 2168 | } |
4e81bb83 MN |
2169 | for (i = 0; i < pols[pi]->xfrm_nr; i++) |
2170 | tpp[ti++] = &pols[pi]->xfrm_vec[i]; | |
2171 | } | |
2172 | xfrm_nr = ti; | |
41a49cc3 MN |
2173 | if (npols > 1) { |
2174 | xfrm_tmpl_sort(stp, tpp, xfrm_nr, family); | |
2175 | tpp = stp; | |
2176 | } | |
4e81bb83 | 2177 | |
1da177e4 LT |
2178 | /* For each tunnel xfrm, find the first matching tmpl. |
2179 | * For each tmpl before that, find corresponding xfrm. | |
2180 | * Order is _important_. Later we will implement | |
2181 | * some barriers, but at the moment barriers | |
2182 | * are implied between each two transformations. | |
2183 | */ | |
4e81bb83 MN |
2184 | for (i = xfrm_nr-1, k = 0; i >= 0; i--) { |
2185 | k = xfrm_policy_ok(tpp[i], sp, k, family); | |
df0ba92a | 2186 | if (k < 0) { |
d1d9facf JM |
2187 | if (k < -1) |
2188 | /* "-2 - errored_index" returned */ | |
2189 | xerr_idx = -(2+k); | |
59c9940e | 2190 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 2191 | goto reject; |
df0ba92a | 2192 | } |
1da177e4 LT |
2193 | } |
2194 | ||
0aa64774 | 2195 | if (secpath_has_nontransport(sp, k, &xerr_idx)) { |
59c9940e | 2196 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 2197 | goto reject; |
0aa64774 | 2198 | } |
1da177e4 | 2199 | |
4e81bb83 | 2200 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
2201 | return 1; |
2202 | } | |
59c9940e | 2203 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); |
1da177e4 LT |
2204 | |
2205 | reject: | |
df0ba92a | 2206 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
4e81bb83 MN |
2207 | reject_error: |
2208 | xfrm_pols_put(pols, npols); | |
1da177e4 LT |
2209 | return 0; |
2210 | } | |
2211 | EXPORT_SYMBOL(__xfrm_policy_check); | |
2212 | ||
2213 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
2214 | { | |
99a66657 | 2215 | struct net *net = dev_net(skb->dev); |
1da177e4 | 2216 | struct flowi fl; |
adf30907 | 2217 | struct dst_entry *dst; |
73137147 | 2218 | int res = 1; |
1da177e4 | 2219 | |
0aa64774 | 2220 | if (xfrm_decode_session(skb, &fl, family) < 0) { |
72032fdb | 2221 | XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR); |
1da177e4 | 2222 | return 0; |
0aa64774 | 2223 | } |
1da177e4 | 2224 | |
fafeeb6c | 2225 | skb_dst_force(skb); |
adf30907 | 2226 | |
452edd59 DM |
2227 | dst = xfrm_lookup(net, skb_dst(skb), &fl, NULL, 0); |
2228 | if (IS_ERR(dst)) { | |
73137147 | 2229 | res = 0; |
452edd59 DM |
2230 | dst = NULL; |
2231 | } | |
adf30907 ED |
2232 | skb_dst_set(skb, dst); |
2233 | return res; | |
1da177e4 LT |
2234 | } |
2235 | EXPORT_SYMBOL(__xfrm_route_forward); | |
2236 | ||
d49c73c7 DM |
2237 | /* Optimize later using cookies and generation ids. */ |
2238 | ||
1da177e4 LT |
2239 | static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) |
2240 | { | |
d49c73c7 | 2241 | /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete |
f5b0a874 DM |
2242 | * to DST_OBSOLETE_FORCE_CHK to force all XFRM destinations to |
2243 | * get validated by dst_ops->check on every use. We do this | |
2244 | * because when a normal route referenced by an XFRM dst is | |
2245 | * obsoleted we do not go looking around for all parent | |
2246 | * referencing XFRM dsts so that we can invalidate them. It | |
2247 | * is just too much work. Instead we make the checks here on | |
2248 | * every use. For example: | |
d49c73c7 DM |
2249 | * |
2250 | * XFRM dst A --> IPv4 dst X | |
2251 | * | |
2252 | * X is the "xdst->route" of A (X is also the "dst->path" of A | |
2253 | * in this example). If X is marked obsolete, "A" will not | |
2254 | * notice. That's what we are validating here via the | |
2255 | * stale_bundle() check. | |
2256 | * | |
2257 | * When a policy's bundle is pruned, we dst_free() the XFRM | |
f5b0a874 DM |
2258 | * dst which causes it's ->obsolete field to be set to |
2259 | * DST_OBSOLETE_DEAD. If an XFRM dst has been pruned like | |
2260 | * this, we want to force a new route lookup. | |
399c180a | 2261 | */ |
d49c73c7 DM |
2262 | if (dst->obsolete < 0 && !stale_bundle(dst)) |
2263 | return dst; | |
2264 | ||
1da177e4 LT |
2265 | return NULL; |
2266 | } | |
2267 | ||
2268 | static int stale_bundle(struct dst_entry *dst) | |
2269 | { | |
12fdb4d3 | 2270 | return !xfrm_bundle_ok((struct xfrm_dst *)dst); |
1da177e4 LT |
2271 | } |
2272 | ||
aabc9761 | 2273 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
1da177e4 | 2274 | { |
1da177e4 | 2275 | while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { |
c346dca1 | 2276 | dst->dev = dev_net(dev)->loopback_dev; |
de3cb747 | 2277 | dev_hold(dst->dev); |
1da177e4 LT |
2278 | dev_put(dev); |
2279 | } | |
2280 | } | |
aabc9761 | 2281 | EXPORT_SYMBOL(xfrm_dst_ifdown); |
1da177e4 LT |
2282 | |
2283 | static void xfrm_link_failure(struct sk_buff *skb) | |
2284 | { | |
2285 | /* Impossible. Such dst must be popped before reaches point of failure. */ | |
1da177e4 LT |
2286 | } |
2287 | ||
2288 | static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) | |
2289 | { | |
2290 | if (dst) { | |
2291 | if (dst->obsolete) { | |
2292 | dst_release(dst); | |
2293 | dst = NULL; | |
2294 | } | |
2295 | } | |
2296 | return dst; | |
2297 | } | |
2298 | ||
80c802f3 | 2299 | static void __xfrm_garbage_collect(struct net *net) |
1da177e4 | 2300 | { |
80c802f3 | 2301 | struct dst_entry *head, *next; |
1da177e4 | 2302 | |
80c802f3 TT |
2303 | spin_lock_bh(&xfrm_policy_sk_bundle_lock); |
2304 | head = xfrm_policy_sk_bundles; | |
2305 | xfrm_policy_sk_bundles = NULL; | |
2306 | spin_unlock_bh(&xfrm_policy_sk_bundle_lock); | |
2518c7c2 | 2307 | |
80c802f3 TT |
2308 | while (head) { |
2309 | next = head->next; | |
2310 | dst_free(head); | |
2311 | head = next; | |
1da177e4 LT |
2312 | } |
2313 | } | |
2314 | ||
c0ed1c14 SK |
2315 | static void xfrm_garbage_collect(struct net *net) |
2316 | { | |
2317 | flow_cache_flush(); | |
2318 | __xfrm_garbage_collect(net); | |
2319 | } | |
2320 | ||
2321 | static void xfrm_garbage_collect_deferred(struct net *net) | |
2322 | { | |
2323 | flow_cache_flush_deferred(); | |
2324 | __xfrm_garbage_collect(net); | |
2325 | } | |
2326 | ||
25ee3286 | 2327 | static void xfrm_init_pmtu(struct dst_entry *dst) |
1da177e4 LT |
2328 | { |
2329 | do { | |
2330 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2331 | u32 pmtu, route_mtu_cached; | |
2332 | ||
2333 | pmtu = dst_mtu(dst->child); | |
2334 | xdst->child_mtu_cached = pmtu; | |
2335 | ||
2336 | pmtu = xfrm_state_mtu(dst->xfrm, pmtu); | |
2337 | ||
2338 | route_mtu_cached = dst_mtu(xdst->route); | |
2339 | xdst->route_mtu_cached = route_mtu_cached; | |
2340 | ||
2341 | if (pmtu > route_mtu_cached) | |
2342 | pmtu = route_mtu_cached; | |
2343 | ||
defb3519 | 2344 | dst_metric_set(dst, RTAX_MTU, pmtu); |
1da177e4 LT |
2345 | } while ((dst = dst->next)); |
2346 | } | |
2347 | ||
1da177e4 LT |
2348 | /* Check that the bundle accepts the flow and its components are |
2349 | * still valid. | |
2350 | */ | |
2351 | ||
12fdb4d3 | 2352 | static int xfrm_bundle_ok(struct xfrm_dst *first) |
1da177e4 LT |
2353 | { |
2354 | struct dst_entry *dst = &first->u.dst; | |
2355 | struct xfrm_dst *last; | |
2356 | u32 mtu; | |
2357 | ||
92d63dec | 2358 | if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || |
1da177e4 LT |
2359 | (dst->dev && !netif_running(dst->dev))) |
2360 | return 0; | |
2361 | ||
2362 | last = NULL; | |
2363 | ||
2364 | do { | |
2365 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2366 | ||
1da177e4 LT |
2367 | if (dst->xfrm->km.state != XFRM_STATE_VALID) |
2368 | return 0; | |
80c802f3 TT |
2369 | if (xdst->xfrm_genid != dst->xfrm->genid) |
2370 | return 0; | |
b1312c89 TT |
2371 | if (xdst->num_pols > 0 && |
2372 | xdst->policy_genid != atomic_read(&xdst->pols[0]->genid)) | |
9d4a706d | 2373 | return 0; |
e53820de | 2374 | |
1da177e4 LT |
2375 | mtu = dst_mtu(dst->child); |
2376 | if (xdst->child_mtu_cached != mtu) { | |
2377 | last = xdst; | |
2378 | xdst->child_mtu_cached = mtu; | |
2379 | } | |
2380 | ||
92d63dec | 2381 | if (!dst_check(xdst->route, xdst->route_cookie)) |
1da177e4 LT |
2382 | return 0; |
2383 | mtu = dst_mtu(xdst->route); | |
2384 | if (xdst->route_mtu_cached != mtu) { | |
2385 | last = xdst; | |
2386 | xdst->route_mtu_cached = mtu; | |
2387 | } | |
2388 | ||
2389 | dst = dst->child; | |
2390 | } while (dst->xfrm); | |
2391 | ||
2392 | if (likely(!last)) | |
2393 | return 1; | |
2394 | ||
2395 | mtu = last->child_mtu_cached; | |
2396 | for (;;) { | |
2397 | dst = &last->u.dst; | |
2398 | ||
2399 | mtu = xfrm_state_mtu(dst->xfrm, mtu); | |
2400 | if (mtu > last->route_mtu_cached) | |
2401 | mtu = last->route_mtu_cached; | |
defb3519 | 2402 | dst_metric_set(dst, RTAX_MTU, mtu); |
1da177e4 LT |
2403 | |
2404 | if (last == first) | |
2405 | break; | |
2406 | ||
bd0bf076 | 2407 | last = (struct xfrm_dst *)last->u.dst.next; |
1da177e4 LT |
2408 | last->child_mtu_cached = mtu; |
2409 | } | |
2410 | ||
2411 | return 1; | |
2412 | } | |
2413 | ||
0dbaee3b DM |
2414 | static unsigned int xfrm_default_advmss(const struct dst_entry *dst) |
2415 | { | |
2416 | return dst_metric_advmss(dst->path); | |
2417 | } | |
2418 | ||
ebb762f2 | 2419 | static unsigned int xfrm_mtu(const struct dst_entry *dst) |
d33e4553 | 2420 | { |
618f9bc7 SK |
2421 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
2422 | ||
2423 | return mtu ? : dst_mtu(dst->path); | |
d33e4553 DM |
2424 | } |
2425 | ||
f894cbf8 DM |
2426 | static struct neighbour *xfrm_neigh_lookup(const struct dst_entry *dst, |
2427 | struct sk_buff *skb, | |
2428 | const void *daddr) | |
d3aaeb38 | 2429 | { |
f894cbf8 | 2430 | return dst->path->ops->neigh_lookup(dst, skb, daddr); |
d3aaeb38 DM |
2431 | } |
2432 | ||
1da177e4 LT |
2433 | int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) |
2434 | { | |
d7c7544c | 2435 | struct net *net; |
1da177e4 LT |
2436 | int err = 0; |
2437 | if (unlikely(afinfo == NULL)) | |
2438 | return -EINVAL; | |
2439 | if (unlikely(afinfo->family >= NPROTO)) | |
2440 | return -EAFNOSUPPORT; | |
ef8531b6 | 2441 | spin_lock(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2442 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) |
2443 | err = -ENOBUFS; | |
2444 | else { | |
2445 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2446 | if (likely(dst_ops->kmem_cachep == NULL)) | |
2447 | dst_ops->kmem_cachep = xfrm_dst_cache; | |
2448 | if (likely(dst_ops->check == NULL)) | |
2449 | dst_ops->check = xfrm_dst_check; | |
0dbaee3b DM |
2450 | if (likely(dst_ops->default_advmss == NULL)) |
2451 | dst_ops->default_advmss = xfrm_default_advmss; | |
ebb762f2 SK |
2452 | if (likely(dst_ops->mtu == NULL)) |
2453 | dst_ops->mtu = xfrm_mtu; | |
1da177e4 LT |
2454 | if (likely(dst_ops->negative_advice == NULL)) |
2455 | dst_ops->negative_advice = xfrm_negative_advice; | |
2456 | if (likely(dst_ops->link_failure == NULL)) | |
2457 | dst_ops->link_failure = xfrm_link_failure; | |
d3aaeb38 DM |
2458 | if (likely(dst_ops->neigh_lookup == NULL)) |
2459 | dst_ops->neigh_lookup = xfrm_neigh_lookup; | |
1da177e4 | 2460 | if (likely(afinfo->garbage_collect == NULL)) |
c0ed1c14 | 2461 | afinfo->garbage_collect = xfrm_garbage_collect_deferred; |
418a99ac | 2462 | rcu_assign_pointer(xfrm_policy_afinfo[afinfo->family], afinfo); |
1da177e4 | 2463 | } |
ef8531b6 | 2464 | spin_unlock(&xfrm_policy_afinfo_lock); |
d7c7544c AD |
2465 | |
2466 | rtnl_lock(); | |
2467 | for_each_net(net) { | |
2468 | struct dst_ops *xfrm_dst_ops; | |
2469 | ||
2470 | switch (afinfo->family) { | |
2471 | case AF_INET: | |
2472 | xfrm_dst_ops = &net->xfrm.xfrm4_dst_ops; | |
2473 | break; | |
dfd56b8b | 2474 | #if IS_ENABLED(CONFIG_IPV6) |
d7c7544c AD |
2475 | case AF_INET6: |
2476 | xfrm_dst_ops = &net->xfrm.xfrm6_dst_ops; | |
2477 | break; | |
2478 | #endif | |
2479 | default: | |
2480 | BUG(); | |
2481 | } | |
2482 | *xfrm_dst_ops = *afinfo->dst_ops; | |
2483 | } | |
2484 | rtnl_unlock(); | |
2485 | ||
1da177e4 LT |
2486 | return err; |
2487 | } | |
2488 | EXPORT_SYMBOL(xfrm_policy_register_afinfo); | |
2489 | ||
2490 | int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2491 | { | |
2492 | int err = 0; | |
2493 | if (unlikely(afinfo == NULL)) | |
2494 | return -EINVAL; | |
2495 | if (unlikely(afinfo->family >= NPROTO)) | |
2496 | return -EAFNOSUPPORT; | |
ef8531b6 | 2497 | spin_lock(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2498 | if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { |
2499 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) | |
2500 | err = -EINVAL; | |
ef8531b6 ED |
2501 | else |
2502 | RCU_INIT_POINTER(xfrm_policy_afinfo[afinfo->family], | |
2503 | NULL); | |
2504 | } | |
2505 | spin_unlock(&xfrm_policy_afinfo_lock); | |
2506 | if (!err) { | |
2507 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2508 | ||
2509 | synchronize_rcu(); | |
2510 | ||
2511 | dst_ops->kmem_cachep = NULL; | |
2512 | dst_ops->check = NULL; | |
2513 | dst_ops->negative_advice = NULL; | |
2514 | dst_ops->link_failure = NULL; | |
2515 | afinfo->garbage_collect = NULL; | |
1da177e4 | 2516 | } |
1da177e4 LT |
2517 | return err; |
2518 | } | |
2519 | EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); | |
2520 | ||
d7c7544c AD |
2521 | static void __net_init xfrm_dst_ops_init(struct net *net) |
2522 | { | |
2523 | struct xfrm_policy_afinfo *afinfo; | |
2524 | ||
ef8531b6 ED |
2525 | rcu_read_lock(); |
2526 | afinfo = rcu_dereference(xfrm_policy_afinfo[AF_INET]); | |
d7c7544c AD |
2527 | if (afinfo) |
2528 | net->xfrm.xfrm4_dst_ops = *afinfo->dst_ops; | |
dfd56b8b | 2529 | #if IS_ENABLED(CONFIG_IPV6) |
ef8531b6 | 2530 | afinfo = rcu_dereference(xfrm_policy_afinfo[AF_INET6]); |
d7c7544c AD |
2531 | if (afinfo) |
2532 | net->xfrm.xfrm6_dst_ops = *afinfo->dst_ops; | |
2533 | #endif | |
418a99ac | 2534 | rcu_read_unlock(); |
546be240 HX |
2535 | } |
2536 | ||
1da177e4 LT |
2537 | static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) |
2538 | { | |
e9dc8653 EB |
2539 | struct net_device *dev = ptr; |
2540 | ||
1da177e4 LT |
2541 | switch (event) { |
2542 | case NETDEV_DOWN: | |
c0ed1c14 | 2543 | xfrm_garbage_collect(dev_net(dev)); |
1da177e4 LT |
2544 | } |
2545 | return NOTIFY_DONE; | |
2546 | } | |
2547 | ||
2548 | static struct notifier_block xfrm_dev_notifier = { | |
d5917a35 | 2549 | .notifier_call = xfrm_dev_event, |
1da177e4 LT |
2550 | }; |
2551 | ||
558f82ef | 2552 | #ifdef CONFIG_XFRM_STATISTICS |
59c9940e | 2553 | static int __net_init xfrm_statistics_init(struct net *net) |
558f82ef | 2554 | { |
c68cd1a0 AD |
2555 | int rv; |
2556 | ||
7d720c3e | 2557 | if (snmp_mib_init((void __percpu **)net->mib.xfrm_statistics, |
1823e4c8 ED |
2558 | sizeof(struct linux_xfrm_mib), |
2559 | __alignof__(struct linux_xfrm_mib)) < 0) | |
558f82ef | 2560 | return -ENOMEM; |
c68cd1a0 AD |
2561 | rv = xfrm_proc_init(net); |
2562 | if (rv < 0) | |
7d720c3e | 2563 | snmp_mib_free((void __percpu **)net->mib.xfrm_statistics); |
c68cd1a0 | 2564 | return rv; |
558f82ef | 2565 | } |
59c9940e AD |
2566 | |
2567 | static void xfrm_statistics_fini(struct net *net) | |
2568 | { | |
c68cd1a0 | 2569 | xfrm_proc_fini(net); |
7d720c3e | 2570 | snmp_mib_free((void __percpu **)net->mib.xfrm_statistics); |
59c9940e AD |
2571 | } |
2572 | #else | |
2573 | static int __net_init xfrm_statistics_init(struct net *net) | |
2574 | { | |
2575 | return 0; | |
2576 | } | |
2577 | ||
2578 | static void xfrm_statistics_fini(struct net *net) | |
2579 | { | |
2580 | } | |
558f82ef MN |
2581 | #endif |
2582 | ||
d62ddc21 | 2583 | static int __net_init xfrm_policy_init(struct net *net) |
1da177e4 | 2584 | { |
2518c7c2 DM |
2585 | unsigned int hmask, sz; |
2586 | int dir; | |
2587 | ||
d62ddc21 AD |
2588 | if (net_eq(net, &init_net)) |
2589 | xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", | |
1da177e4 | 2590 | sizeof(struct xfrm_dst), |
e5d679f3 | 2591 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
20c2df83 | 2592 | NULL); |
1da177e4 | 2593 | |
2518c7c2 DM |
2594 | hmask = 8 - 1; |
2595 | sz = (hmask+1) * sizeof(struct hlist_head); | |
2596 | ||
93b851c1 AD |
2597 | net->xfrm.policy_byidx = xfrm_hash_alloc(sz); |
2598 | if (!net->xfrm.policy_byidx) | |
2599 | goto out_byidx; | |
8100bea7 | 2600 | net->xfrm.policy_idx_hmask = hmask; |
2518c7c2 DM |
2601 | |
2602 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
2603 | struct xfrm_policy_hash *htab; | |
2604 | ||
dc2caba7 | 2605 | net->xfrm.policy_count[dir] = 0; |
8b18f8ea | 2606 | INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]); |
2518c7c2 | 2607 | |
a35f6c5d | 2608 | htab = &net->xfrm.policy_bydst[dir]; |
44e36b42 | 2609 | htab->table = xfrm_hash_alloc(sz); |
2518c7c2 | 2610 | if (!htab->table) |
a35f6c5d AD |
2611 | goto out_bydst; |
2612 | htab->hmask = hmask; | |
2518c7c2 DM |
2613 | } |
2614 | ||
adfcf0b2 | 2615 | INIT_LIST_HEAD(&net->xfrm.policy_all); |
66caf628 | 2616 | INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize); |
d62ddc21 AD |
2617 | if (net_eq(net, &init_net)) |
2618 | register_netdevice_notifier(&xfrm_dev_notifier); | |
2619 | return 0; | |
93b851c1 | 2620 | |
a35f6c5d AD |
2621 | out_bydst: |
2622 | for (dir--; dir >= 0; dir--) { | |
2623 | struct xfrm_policy_hash *htab; | |
2624 | ||
2625 | htab = &net->xfrm.policy_bydst[dir]; | |
2626 | xfrm_hash_free(htab->table, sz); | |
2627 | } | |
2628 | xfrm_hash_free(net->xfrm.policy_byidx, sz); | |
93b851c1 AD |
2629 | out_byidx: |
2630 | return -ENOMEM; | |
d62ddc21 AD |
2631 | } |
2632 | ||
2633 | static void xfrm_policy_fini(struct net *net) | |
2634 | { | |
7c2776ee | 2635 | struct xfrm_audit audit_info; |
93b851c1 | 2636 | unsigned int sz; |
8b18f8ea | 2637 | int dir; |
93b851c1 | 2638 | |
7c2776ee AD |
2639 | flush_work(&net->xfrm.policy_hash_work); |
2640 | #ifdef CONFIG_XFRM_SUB_POLICY | |
e1760bd5 | 2641 | audit_info.loginuid = INVALID_UID; |
7c2776ee AD |
2642 | audit_info.sessionid = -1; |
2643 | audit_info.secid = 0; | |
2644 | xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, &audit_info); | |
2645 | #endif | |
e1760bd5 | 2646 | audit_info.loginuid = INVALID_UID; |
7c2776ee AD |
2647 | audit_info.sessionid = -1; |
2648 | audit_info.secid = 0; | |
2649 | xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info); | |
7c2776ee | 2650 | |
adfcf0b2 | 2651 | WARN_ON(!list_empty(&net->xfrm.policy_all)); |
93b851c1 | 2652 | |
8b18f8ea | 2653 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
a35f6c5d AD |
2654 | struct xfrm_policy_hash *htab; |
2655 | ||
8b18f8ea | 2656 | WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir])); |
a35f6c5d AD |
2657 | |
2658 | htab = &net->xfrm.policy_bydst[dir]; | |
2659 | sz = (htab->hmask + 1); | |
2660 | WARN_ON(!hlist_empty(htab->table)); | |
2661 | xfrm_hash_free(htab->table, sz); | |
8b18f8ea AD |
2662 | } |
2663 | ||
8100bea7 | 2664 | sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head); |
93b851c1 AD |
2665 | WARN_ON(!hlist_empty(net->xfrm.policy_byidx)); |
2666 | xfrm_hash_free(net->xfrm.policy_byidx, sz); | |
1da177e4 LT |
2667 | } |
2668 | ||
d62ddc21 AD |
2669 | static int __net_init xfrm_net_init(struct net *net) |
2670 | { | |
2671 | int rv; | |
2672 | ||
59c9940e AD |
2673 | rv = xfrm_statistics_init(net); |
2674 | if (rv < 0) | |
2675 | goto out_statistics; | |
d62ddc21 AD |
2676 | rv = xfrm_state_init(net); |
2677 | if (rv < 0) | |
2678 | goto out_state; | |
2679 | rv = xfrm_policy_init(net); | |
2680 | if (rv < 0) | |
2681 | goto out_policy; | |
d7c7544c | 2682 | xfrm_dst_ops_init(net); |
b27aeadb AD |
2683 | rv = xfrm_sysctl_init(net); |
2684 | if (rv < 0) | |
2685 | goto out_sysctl; | |
d62ddc21 AD |
2686 | return 0; |
2687 | ||
b27aeadb AD |
2688 | out_sysctl: |
2689 | xfrm_policy_fini(net); | |
d62ddc21 AD |
2690 | out_policy: |
2691 | xfrm_state_fini(net); | |
2692 | out_state: | |
59c9940e AD |
2693 | xfrm_statistics_fini(net); |
2694 | out_statistics: | |
d62ddc21 AD |
2695 | return rv; |
2696 | } | |
2697 | ||
2698 | static void __net_exit xfrm_net_exit(struct net *net) | |
2699 | { | |
b27aeadb | 2700 | xfrm_sysctl_fini(net); |
d62ddc21 AD |
2701 | xfrm_policy_fini(net); |
2702 | xfrm_state_fini(net); | |
59c9940e | 2703 | xfrm_statistics_fini(net); |
d62ddc21 AD |
2704 | } |
2705 | ||
2706 | static struct pernet_operations __net_initdata xfrm_net_ops = { | |
2707 | .init = xfrm_net_init, | |
2708 | .exit = xfrm_net_exit, | |
2709 | }; | |
2710 | ||
1da177e4 LT |
2711 | void __init xfrm_init(void) |
2712 | { | |
d62ddc21 | 2713 | register_pernet_subsys(&xfrm_net_ops); |
1da177e4 LT |
2714 | xfrm_input_init(); |
2715 | } | |
2716 | ||
ab5f5e8b | 2717 | #ifdef CONFIG_AUDITSYSCALL |
1486cbd7 IJ |
2718 | static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp, |
2719 | struct audit_buffer *audit_buf) | |
ab5f5e8b | 2720 | { |
875179fa PM |
2721 | struct xfrm_sec_ctx *ctx = xp->security; |
2722 | struct xfrm_selector *sel = &xp->selector; | |
2723 | ||
2724 | if (ctx) | |
ab5f5e8b | 2725 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", |
875179fa | 2726 | ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); |
ab5f5e8b | 2727 | |
875179fa | 2728 | switch(sel->family) { |
ab5f5e8b | 2729 | case AF_INET: |
21454aaa | 2730 | audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4); |
875179fa PM |
2731 | if (sel->prefixlen_s != 32) |
2732 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2733 | sel->prefixlen_s); | |
21454aaa | 2734 | audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4); |
875179fa PM |
2735 | if (sel->prefixlen_d != 32) |
2736 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2737 | sel->prefixlen_d); | |
ab5f5e8b JL |
2738 | break; |
2739 | case AF_INET6: | |
5b095d98 | 2740 | audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6); |
875179fa PM |
2741 | if (sel->prefixlen_s != 128) |
2742 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2743 | sel->prefixlen_s); | |
5b095d98 | 2744 | audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6); |
875179fa PM |
2745 | if (sel->prefixlen_d != 128) |
2746 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2747 | sel->prefixlen_d); | |
ab5f5e8b JL |
2748 | break; |
2749 | } | |
2750 | } | |
2751 | ||
68277acc | 2752 | void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, |
e1760bd5 | 2753 | kuid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2754 | { |
2755 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2756 | |
afeb14b4 | 2757 | audit_buf = xfrm_audit_start("SPD-add"); |
ab5f5e8b JL |
2758 | if (audit_buf == NULL) |
2759 | return; | |
2532386f | 2760 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 | 2761 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
2762 | xfrm_audit_common_policyinfo(xp, audit_buf); |
2763 | audit_log_end(audit_buf); | |
2764 | } | |
2765 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_add); | |
2766 | ||
68277acc | 2767 | void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, |
e1760bd5 | 2768 | kuid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2769 | { |
2770 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2771 | |
afeb14b4 | 2772 | audit_buf = xfrm_audit_start("SPD-delete"); |
ab5f5e8b JL |
2773 | if (audit_buf == NULL) |
2774 | return; | |
2532386f | 2775 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 | 2776 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
2777 | xfrm_audit_common_policyinfo(xp, audit_buf); |
2778 | audit_log_end(audit_buf); | |
2779 | } | |
2780 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete); | |
2781 | #endif | |
2782 | ||
80c9abaa | 2783 | #ifdef CONFIG_XFRM_MIGRATE |
bc9b35ad DM |
2784 | static bool xfrm_migrate_selector_match(const struct xfrm_selector *sel_cmp, |
2785 | const struct xfrm_selector *sel_tgt) | |
80c9abaa SS |
2786 | { |
2787 | if (sel_cmp->proto == IPSEC_ULPROTO_ANY) { | |
2788 | if (sel_tgt->family == sel_cmp->family && | |
2789 | xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr, | |
a716c119 | 2790 | sel_cmp->family) == 0 && |
80c9abaa SS |
2791 | xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr, |
2792 | sel_cmp->family) == 0 && | |
2793 | sel_tgt->prefixlen_d == sel_cmp->prefixlen_d && | |
2794 | sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) { | |
bc9b35ad | 2795 | return true; |
80c9abaa SS |
2796 | } |
2797 | } else { | |
2798 | if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) { | |
bc9b35ad | 2799 | return true; |
80c9abaa SS |
2800 | } |
2801 | } | |
bc9b35ad | 2802 | return false; |
80c9abaa SS |
2803 | } |
2804 | ||
b4b7c0b3 | 2805 | static struct xfrm_policy * xfrm_migrate_policy_find(const struct xfrm_selector *sel, |
80c9abaa SS |
2806 | u8 dir, u8 type) |
2807 | { | |
2808 | struct xfrm_policy *pol, *ret = NULL; | |
2809 | struct hlist_node *entry; | |
2810 | struct hlist_head *chain; | |
2811 | u32 priority = ~0U; | |
2812 | ||
2813 | read_lock_bh(&xfrm_policy_lock); | |
1121994c | 2814 | chain = policy_hash_direct(&init_net, &sel->daddr, &sel->saddr, sel->family, dir); |
80c9abaa SS |
2815 | hlist_for_each_entry(pol, entry, chain, bydst) { |
2816 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2817 | pol->type == type) { | |
2818 | ret = pol; | |
2819 | priority = ret->priority; | |
2820 | break; | |
2821 | } | |
2822 | } | |
8b18f8ea | 2823 | chain = &init_net.xfrm.policy_inexact[dir]; |
80c9abaa SS |
2824 | hlist_for_each_entry(pol, entry, chain, bydst) { |
2825 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2826 | pol->type == type && | |
2827 | pol->priority < priority) { | |
2828 | ret = pol; | |
2829 | break; | |
2830 | } | |
2831 | } | |
2832 | ||
2833 | if (ret) | |
2834 | xfrm_pol_hold(ret); | |
2835 | ||
2836 | read_unlock_bh(&xfrm_policy_lock); | |
2837 | ||
2838 | return ret; | |
2839 | } | |
2840 | ||
dd701754 | 2841 | static int migrate_tmpl_match(const struct xfrm_migrate *m, const struct xfrm_tmpl *t) |
80c9abaa SS |
2842 | { |
2843 | int match = 0; | |
2844 | ||
2845 | if (t->mode == m->mode && t->id.proto == m->proto && | |
2846 | (m->reqid == 0 || t->reqid == m->reqid)) { | |
2847 | switch (t->mode) { | |
2848 | case XFRM_MODE_TUNNEL: | |
2849 | case XFRM_MODE_BEET: | |
2850 | if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr, | |
2851 | m->old_family) == 0 && | |
2852 | xfrm_addr_cmp(&t->saddr, &m->old_saddr, | |
2853 | m->old_family) == 0) { | |
2854 | match = 1; | |
2855 | } | |
2856 | break; | |
2857 | case XFRM_MODE_TRANSPORT: | |
2858 | /* in case of transport mode, template does not store | |
2859 | any IP addresses, hence we just compare mode and | |
2860 | protocol */ | |
2861 | match = 1; | |
2862 | break; | |
2863 | default: | |
2864 | break; | |
2865 | } | |
2866 | } | |
2867 | return match; | |
2868 | } | |
2869 | ||
2870 | /* update endpoint address(es) of template(s) */ | |
2871 | static int xfrm_policy_migrate(struct xfrm_policy *pol, | |
2872 | struct xfrm_migrate *m, int num_migrate) | |
2873 | { | |
2874 | struct xfrm_migrate *mp; | |
80c9abaa SS |
2875 | int i, j, n = 0; |
2876 | ||
2877 | write_lock_bh(&pol->lock); | |
12a169e7 | 2878 | if (unlikely(pol->walk.dead)) { |
80c9abaa SS |
2879 | /* target policy has been deleted */ |
2880 | write_unlock_bh(&pol->lock); | |
2881 | return -ENOENT; | |
2882 | } | |
2883 | ||
2884 | for (i = 0; i < pol->xfrm_nr; i++) { | |
2885 | for (j = 0, mp = m; j < num_migrate; j++, mp++) { | |
2886 | if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i])) | |
2887 | continue; | |
2888 | n++; | |
1bfcb10f HX |
2889 | if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL && |
2890 | pol->xfrm_vec[i].mode != XFRM_MODE_BEET) | |
80c9abaa SS |
2891 | continue; |
2892 | /* update endpoints */ | |
2893 | memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr, | |
2894 | sizeof(pol->xfrm_vec[i].id.daddr)); | |
2895 | memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr, | |
2896 | sizeof(pol->xfrm_vec[i].saddr)); | |
2897 | pol->xfrm_vec[i].encap_family = mp->new_family; | |
2898 | /* flush bundles */ | |
80c802f3 | 2899 | atomic_inc(&pol->genid); |
80c9abaa SS |
2900 | } |
2901 | } | |
2902 | ||
2903 | write_unlock_bh(&pol->lock); | |
2904 | ||
2905 | if (!n) | |
2906 | return -ENODATA; | |
2907 | ||
2908 | return 0; | |
2909 | } | |
2910 | ||
dd701754 | 2911 | static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate) |
80c9abaa SS |
2912 | { |
2913 | int i, j; | |
2914 | ||
2915 | if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) | |
2916 | return -EINVAL; | |
2917 | ||
2918 | for (i = 0; i < num_migrate; i++) { | |
2919 | if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr, | |
2920 | m[i].old_family) == 0) && | |
2921 | (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr, | |
2922 | m[i].old_family) == 0)) | |
2923 | return -EINVAL; | |
2924 | if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) || | |
2925 | xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) | |
2926 | return -EINVAL; | |
2927 | ||
2928 | /* check if there is any duplicated entry */ | |
2929 | for (j = i + 1; j < num_migrate; j++) { | |
2930 | if (!memcmp(&m[i].old_daddr, &m[j].old_daddr, | |
2931 | sizeof(m[i].old_daddr)) && | |
2932 | !memcmp(&m[i].old_saddr, &m[j].old_saddr, | |
2933 | sizeof(m[i].old_saddr)) && | |
2934 | m[i].proto == m[j].proto && | |
2935 | m[i].mode == m[j].mode && | |
2936 | m[i].reqid == m[j].reqid && | |
2937 | m[i].old_family == m[j].old_family) | |
2938 | return -EINVAL; | |
2939 | } | |
2940 | } | |
2941 | ||
2942 | return 0; | |
2943 | } | |
2944 | ||
b4b7c0b3 | 2945 | int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, |
13c1d189 AE |
2946 | struct xfrm_migrate *m, int num_migrate, |
2947 | struct xfrm_kmaddress *k) | |
80c9abaa SS |
2948 | { |
2949 | int i, err, nx_cur = 0, nx_new = 0; | |
2950 | struct xfrm_policy *pol = NULL; | |
2951 | struct xfrm_state *x, *xc; | |
2952 | struct xfrm_state *x_cur[XFRM_MAX_DEPTH]; | |
2953 | struct xfrm_state *x_new[XFRM_MAX_DEPTH]; | |
2954 | struct xfrm_migrate *mp; | |
2955 | ||
2956 | if ((err = xfrm_migrate_check(m, num_migrate)) < 0) | |
2957 | goto out; | |
2958 | ||
2959 | /* Stage 1 - find policy */ | |
2960 | if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) { | |
2961 | err = -ENOENT; | |
2962 | goto out; | |
2963 | } | |
2964 | ||
2965 | /* Stage 2 - find and update state(s) */ | |
2966 | for (i = 0, mp = m; i < num_migrate; i++, mp++) { | |
2967 | if ((x = xfrm_migrate_state_find(mp))) { | |
2968 | x_cur[nx_cur] = x; | |
2969 | nx_cur++; | |
2970 | if ((xc = xfrm_state_migrate(x, mp))) { | |
2971 | x_new[nx_new] = xc; | |
2972 | nx_new++; | |
2973 | } else { | |
2974 | err = -ENODATA; | |
2975 | goto restore_state; | |
2976 | } | |
2977 | } | |
2978 | } | |
2979 | ||
2980 | /* Stage 3 - update policy */ | |
2981 | if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0) | |
2982 | goto restore_state; | |
2983 | ||
2984 | /* Stage 4 - delete old state(s) */ | |
2985 | if (nx_cur) { | |
2986 | xfrm_states_put(x_cur, nx_cur); | |
2987 | xfrm_states_delete(x_cur, nx_cur); | |
2988 | } | |
2989 | ||
2990 | /* Stage 5 - announce */ | |
13c1d189 | 2991 | km_migrate(sel, dir, type, m, num_migrate, k); |
80c9abaa SS |
2992 | |
2993 | xfrm_pol_put(pol); | |
2994 | ||
2995 | return 0; | |
2996 | out: | |
2997 | return err; | |
2998 | ||
2999 | restore_state: | |
3000 | if (pol) | |
3001 | xfrm_pol_put(pol); | |
3002 | if (nx_cur) | |
3003 | xfrm_states_put(x_cur, nx_cur); | |
3004 | if (nx_new) | |
3005 | xfrm_states_delete(x_new, nx_new); | |
3006 | ||
3007 | return err; | |
3008 | } | |
e610e679 | 3009 | EXPORT_SYMBOL(xfrm_migrate); |
80c9abaa | 3010 | #endif |