Commit | Line | Data |
---|---|---|
a716c119 | 1 | /* |
1da177e4 LT |
2 | * xfrm_policy.c |
3 | * | |
4 | * Changes: | |
5 | * Mitsuru KANDA @USAGI | |
6 | * Kazunori MIYAZAWA @USAGI | |
7 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> | |
8 | * IPv6 support | |
9 | * Kazunori MIYAZAWA @USAGI | |
10 | * YOSHIFUJI Hideaki | |
11 | * Split up af-specific portion | |
12 | * Derek Atkins <derek@ihtfp.com> Add the post_input processor | |
df71837d | 13 | * |
1da177e4 LT |
14 | */ |
15 | ||
66cdb3ca | 16 | #include <linux/err.h> |
1da177e4 LT |
17 | #include <linux/slab.h> |
18 | #include <linux/kmod.h> | |
19 | #include <linux/list.h> | |
20 | #include <linux/spinlock.h> | |
21 | #include <linux/workqueue.h> | |
22 | #include <linux/notifier.h> | |
23 | #include <linux/netdevice.h> | |
eb9c7ebe | 24 | #include <linux/netfilter.h> |
1da177e4 | 25 | #include <linux/module.h> |
2518c7c2 | 26 | #include <linux/cache.h> |
68277acc | 27 | #include <linux/audit.h> |
25ee3286 | 28 | #include <net/dst.h> |
1da177e4 LT |
29 | #include <net/xfrm.h> |
30 | #include <net/ip.h> | |
558f82ef MN |
31 | #ifdef CONFIG_XFRM_STATISTICS |
32 | #include <net/snmp.h> | |
33 | #endif | |
1da177e4 | 34 | |
44e36b42 DM |
35 | #include "xfrm_hash.h" |
36 | ||
4a3e2f71 AV |
37 | DEFINE_MUTEX(xfrm_cfg_mutex); |
38 | EXPORT_SYMBOL(xfrm_cfg_mutex); | |
1da177e4 LT |
39 | |
40 | static DEFINE_RWLOCK(xfrm_policy_lock); | |
41 | ||
1da177e4 LT |
42 | static DEFINE_RWLOCK(xfrm_policy_afinfo_lock); |
43 | static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO]; | |
44 | ||
e18b890b | 45 | static struct kmem_cache *xfrm_dst_cache __read_mostly; |
1da177e4 | 46 | |
2518c7c2 | 47 | static HLIST_HEAD(xfrm_policy_gc_list); |
1da177e4 LT |
48 | static DEFINE_SPINLOCK(xfrm_policy_gc_lock); |
49 | ||
50 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family); | |
51 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo); | |
25ee3286 | 52 | static void xfrm_init_pmtu(struct dst_entry *dst); |
1da177e4 | 53 | |
77681021 AM |
54 | static inline int |
55 | __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl) | |
56 | { | |
57 | return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) && | |
58 | addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) && | |
59 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && | |
60 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && | |
61 | (fl->proto == sel->proto || !sel->proto) && | |
62 | (fl->oif == sel->ifindex || !sel->ifindex); | |
63 | } | |
64 | ||
65 | static inline int | |
66 | __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl) | |
67 | { | |
68 | return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) && | |
69 | addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) && | |
70 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && | |
71 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && | |
72 | (fl->proto == sel->proto || !sel->proto) && | |
73 | (fl->oif == sel->ifindex || !sel->ifindex); | |
74 | } | |
75 | ||
76 | int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, | |
77 | unsigned short family) | |
78 | { | |
79 | switch (family) { | |
80 | case AF_INET: | |
81 | return __xfrm4_selector_match(sel, fl); | |
82 | case AF_INET6: | |
83 | return __xfrm6_selector_match(sel, fl); | |
84 | } | |
85 | return 0; | |
86 | } | |
87 | ||
c5b3cf46 | 88 | static inline struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, |
9bb182a7 YH |
89 | xfrm_address_t *saddr, |
90 | xfrm_address_t *daddr, | |
91 | int family) | |
92 | { | |
93 | struct xfrm_policy_afinfo *afinfo; | |
94 | struct dst_entry *dst; | |
95 | ||
96 | afinfo = xfrm_policy_get_afinfo(family); | |
97 | if (unlikely(afinfo == NULL)) | |
98 | return ERR_PTR(-EAFNOSUPPORT); | |
99 | ||
c5b3cf46 | 100 | dst = afinfo->dst_lookup(net, tos, saddr, daddr); |
9bb182a7 YH |
101 | |
102 | xfrm_policy_put_afinfo(afinfo); | |
103 | ||
104 | return dst; | |
105 | } | |
106 | ||
25ee3286 | 107 | static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos, |
9bb182a7 YH |
108 | xfrm_address_t *prev_saddr, |
109 | xfrm_address_t *prev_daddr, | |
25ee3286 | 110 | int family) |
1da177e4 | 111 | { |
c5b3cf46 | 112 | struct net *net = xs_net(x); |
66cdb3ca HX |
113 | xfrm_address_t *saddr = &x->props.saddr; |
114 | xfrm_address_t *daddr = &x->id.daddr; | |
66cdb3ca HX |
115 | struct dst_entry *dst; |
116 | ||
9bb182a7 | 117 | if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) { |
66cdb3ca | 118 | saddr = x->coaddr; |
9bb182a7 YH |
119 | daddr = prev_daddr; |
120 | } | |
121 | if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) { | |
122 | saddr = prev_saddr; | |
66cdb3ca | 123 | daddr = x->coaddr; |
9bb182a7 | 124 | } |
1da177e4 | 125 | |
c5b3cf46 | 126 | dst = __xfrm_dst_lookup(net, tos, saddr, daddr, family); |
9bb182a7 YH |
127 | |
128 | if (!IS_ERR(dst)) { | |
129 | if (prev_saddr != saddr) | |
130 | memcpy(prev_saddr, saddr, sizeof(*prev_saddr)); | |
131 | if (prev_daddr != daddr) | |
132 | memcpy(prev_daddr, daddr, sizeof(*prev_daddr)); | |
133 | } | |
1da177e4 | 134 | |
66cdb3ca | 135 | return dst; |
1da177e4 | 136 | } |
1da177e4 | 137 | |
1da177e4 LT |
138 | static inline unsigned long make_jiffies(long secs) |
139 | { | |
140 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
141 | return MAX_SCHEDULE_TIMEOUT-1; | |
142 | else | |
a716c119 | 143 | return secs*HZ; |
1da177e4 LT |
144 | } |
145 | ||
146 | static void xfrm_policy_timer(unsigned long data) | |
147 | { | |
148 | struct xfrm_policy *xp = (struct xfrm_policy*)data; | |
9d729f72 | 149 | unsigned long now = get_seconds(); |
1da177e4 LT |
150 | long next = LONG_MAX; |
151 | int warn = 0; | |
152 | int dir; | |
153 | ||
154 | read_lock(&xp->lock); | |
155 | ||
12a169e7 | 156 | if (xp->walk.dead) |
1da177e4 LT |
157 | goto out; |
158 | ||
77d8d7a6 | 159 | dir = xfrm_policy_id2dir(xp->index); |
1da177e4 LT |
160 | |
161 | if (xp->lft.hard_add_expires_seconds) { | |
162 | long tmo = xp->lft.hard_add_expires_seconds + | |
163 | xp->curlft.add_time - now; | |
164 | if (tmo <= 0) | |
165 | goto expired; | |
166 | if (tmo < next) | |
167 | next = tmo; | |
168 | } | |
169 | if (xp->lft.hard_use_expires_seconds) { | |
170 | long tmo = xp->lft.hard_use_expires_seconds + | |
171 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
172 | if (tmo <= 0) | |
173 | goto expired; | |
174 | if (tmo < next) | |
175 | next = tmo; | |
176 | } | |
177 | if (xp->lft.soft_add_expires_seconds) { | |
178 | long tmo = xp->lft.soft_add_expires_seconds + | |
179 | xp->curlft.add_time - now; | |
180 | if (tmo <= 0) { | |
181 | warn = 1; | |
182 | tmo = XFRM_KM_TIMEOUT; | |
183 | } | |
184 | if (tmo < next) | |
185 | next = tmo; | |
186 | } | |
187 | if (xp->lft.soft_use_expires_seconds) { | |
188 | long tmo = xp->lft.soft_use_expires_seconds + | |
189 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
190 | if (tmo <= 0) { | |
191 | warn = 1; | |
192 | tmo = XFRM_KM_TIMEOUT; | |
193 | } | |
194 | if (tmo < next) | |
195 | next = tmo; | |
196 | } | |
197 | ||
198 | if (warn) | |
6c5c8ca7 | 199 | km_policy_expired(xp, dir, 0, 0); |
1da177e4 LT |
200 | if (next != LONG_MAX && |
201 | !mod_timer(&xp->timer, jiffies + make_jiffies(next))) | |
202 | xfrm_pol_hold(xp); | |
203 | ||
204 | out: | |
205 | read_unlock(&xp->lock); | |
206 | xfrm_pol_put(xp); | |
207 | return; | |
208 | ||
209 | expired: | |
210 | read_unlock(&xp->lock); | |
4666faab | 211 | if (!xfrm_policy_delete(xp, dir)) |
6c5c8ca7 | 212 | km_policy_expired(xp, dir, 1, 0); |
1da177e4 LT |
213 | xfrm_pol_put(xp); |
214 | } | |
215 | ||
216 | ||
217 | /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2 | |
218 | * SPD calls. | |
219 | */ | |
220 | ||
0331b1f3 | 221 | struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp) |
1da177e4 LT |
222 | { |
223 | struct xfrm_policy *policy; | |
224 | ||
0da974f4 | 225 | policy = kzalloc(sizeof(struct xfrm_policy), gfp); |
1da177e4 LT |
226 | |
227 | if (policy) { | |
0331b1f3 | 228 | write_pnet(&policy->xp_net, net); |
12a169e7 | 229 | INIT_LIST_HEAD(&policy->walk.all); |
2518c7c2 DM |
230 | INIT_HLIST_NODE(&policy->bydst); |
231 | INIT_HLIST_NODE(&policy->byidx); | |
1da177e4 | 232 | rwlock_init(&policy->lock); |
2518c7c2 | 233 | atomic_set(&policy->refcnt, 1); |
b24b8a24 PE |
234 | setup_timer(&policy->timer, xfrm_policy_timer, |
235 | (unsigned long)policy); | |
1da177e4 LT |
236 | } |
237 | return policy; | |
238 | } | |
239 | EXPORT_SYMBOL(xfrm_policy_alloc); | |
240 | ||
241 | /* Destroy xfrm_policy: descendant resources must be released to this moment. */ | |
242 | ||
64c31b3f | 243 | void xfrm_policy_destroy(struct xfrm_policy *policy) |
1da177e4 | 244 | { |
12a169e7 | 245 | BUG_ON(!policy->walk.dead); |
1da177e4 | 246 | |
09a62660 | 247 | BUG_ON(policy->bundles); |
1da177e4 LT |
248 | |
249 | if (del_timer(&policy->timer)) | |
250 | BUG(); | |
251 | ||
03e1ad7b | 252 | security_xfrm_policy_free(policy->security); |
1da177e4 LT |
253 | kfree(policy); |
254 | } | |
64c31b3f | 255 | EXPORT_SYMBOL(xfrm_policy_destroy); |
1da177e4 LT |
256 | |
257 | static void xfrm_policy_gc_kill(struct xfrm_policy *policy) | |
258 | { | |
259 | struct dst_entry *dst; | |
260 | ||
261 | while ((dst = policy->bundles) != NULL) { | |
262 | policy->bundles = dst->next; | |
263 | dst_free(dst); | |
264 | } | |
265 | ||
266 | if (del_timer(&policy->timer)) | |
267 | atomic_dec(&policy->refcnt); | |
268 | ||
269 | if (atomic_read(&policy->refcnt) > 1) | |
270 | flow_cache_flush(); | |
271 | ||
272 | xfrm_pol_put(policy); | |
273 | } | |
274 | ||
c4028958 | 275 | static void xfrm_policy_gc_task(struct work_struct *work) |
1da177e4 LT |
276 | { |
277 | struct xfrm_policy *policy; | |
2518c7c2 DM |
278 | struct hlist_node *entry, *tmp; |
279 | struct hlist_head gc_list; | |
1da177e4 LT |
280 | |
281 | spin_lock_bh(&xfrm_policy_gc_lock); | |
2518c7c2 DM |
282 | gc_list.first = xfrm_policy_gc_list.first; |
283 | INIT_HLIST_HEAD(&xfrm_policy_gc_list); | |
1da177e4 LT |
284 | spin_unlock_bh(&xfrm_policy_gc_lock); |
285 | ||
2518c7c2 | 286 | hlist_for_each_entry_safe(policy, entry, tmp, &gc_list, bydst) |
1da177e4 | 287 | xfrm_policy_gc_kill(policy); |
1da177e4 | 288 | } |
c9583969 | 289 | static DECLARE_WORK(xfrm_policy_gc_work, xfrm_policy_gc_task); |
1da177e4 LT |
290 | |
291 | /* Rule must be locked. Release descentant resources, announce | |
292 | * entry dead. The rule must be unlinked from lists to the moment. | |
293 | */ | |
294 | ||
295 | static void xfrm_policy_kill(struct xfrm_policy *policy) | |
296 | { | |
297 | int dead; | |
298 | ||
299 | write_lock_bh(&policy->lock); | |
12a169e7 HX |
300 | dead = policy->walk.dead; |
301 | policy->walk.dead = 1; | |
1da177e4 LT |
302 | write_unlock_bh(&policy->lock); |
303 | ||
304 | if (unlikely(dead)) { | |
305 | WARN_ON(1); | |
306 | return; | |
307 | } | |
308 | ||
bbb770e7 | 309 | spin_lock_bh(&xfrm_policy_gc_lock); |
2518c7c2 | 310 | hlist_add_head(&policy->bydst, &xfrm_policy_gc_list); |
bbb770e7 | 311 | spin_unlock_bh(&xfrm_policy_gc_lock); |
1da177e4 LT |
312 | |
313 | schedule_work(&xfrm_policy_gc_work); | |
314 | } | |
315 | ||
2518c7c2 DM |
316 | static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024; |
317 | ||
e92303f8 | 318 | static inline unsigned int idx_hash(struct net *net, u32 index) |
2518c7c2 | 319 | { |
e92303f8 | 320 | return __idx_hash(index, net->xfrm.policy_idx_hmask); |
2518c7c2 DM |
321 | } |
322 | ||
1121994c | 323 | static struct hlist_head *policy_hash_bysel(struct net *net, struct xfrm_selector *sel, unsigned short family, int dir) |
2518c7c2 | 324 | { |
1121994c | 325 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
326 | unsigned int hash = __sel_hash(sel, family, hmask); |
327 | ||
328 | return (hash == hmask + 1 ? | |
1121994c AD |
329 | &net->xfrm.policy_inexact[dir] : |
330 | net->xfrm.policy_bydst[dir].table + hash); | |
2518c7c2 DM |
331 | } |
332 | ||
1121994c | 333 | static struct hlist_head *policy_hash_direct(struct net *net, xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir) |
2518c7c2 | 334 | { |
1121994c | 335 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
336 | unsigned int hash = __addr_hash(daddr, saddr, family, hmask); |
337 | ||
1121994c | 338 | return net->xfrm.policy_bydst[dir].table + hash; |
2518c7c2 DM |
339 | } |
340 | ||
2518c7c2 DM |
341 | static void xfrm_dst_hash_transfer(struct hlist_head *list, |
342 | struct hlist_head *ndsttable, | |
343 | unsigned int nhashmask) | |
344 | { | |
b791160b | 345 | struct hlist_node *entry, *tmp, *entry0 = NULL; |
2518c7c2 | 346 | struct xfrm_policy *pol; |
b791160b | 347 | unsigned int h0 = 0; |
2518c7c2 | 348 | |
b791160b | 349 | redo: |
2518c7c2 DM |
350 | hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) { |
351 | unsigned int h; | |
352 | ||
353 | h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr, | |
354 | pol->family, nhashmask); | |
b791160b YH |
355 | if (!entry0) { |
356 | hlist_del(entry); | |
357 | hlist_add_head(&pol->bydst, ndsttable+h); | |
358 | h0 = h; | |
359 | } else { | |
360 | if (h != h0) | |
361 | continue; | |
362 | hlist_del(entry); | |
363 | hlist_add_after(entry0, &pol->bydst); | |
364 | } | |
365 | entry0 = entry; | |
366 | } | |
367 | if (!hlist_empty(list)) { | |
368 | entry0 = NULL; | |
369 | goto redo; | |
2518c7c2 DM |
370 | } |
371 | } | |
372 | ||
373 | static void xfrm_idx_hash_transfer(struct hlist_head *list, | |
374 | struct hlist_head *nidxtable, | |
375 | unsigned int nhashmask) | |
376 | { | |
377 | struct hlist_node *entry, *tmp; | |
378 | struct xfrm_policy *pol; | |
379 | ||
380 | hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) { | |
381 | unsigned int h; | |
382 | ||
383 | h = __idx_hash(pol->index, nhashmask); | |
384 | hlist_add_head(&pol->byidx, nidxtable+h); | |
385 | } | |
386 | } | |
387 | ||
388 | static unsigned long xfrm_new_hash_mask(unsigned int old_hmask) | |
389 | { | |
390 | return ((old_hmask + 1) << 1) - 1; | |
391 | } | |
392 | ||
66caf628 | 393 | static void xfrm_bydst_resize(struct net *net, int dir) |
2518c7c2 | 394 | { |
66caf628 | 395 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
396 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
397 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
66caf628 | 398 | struct hlist_head *odst = net->xfrm.policy_bydst[dir].table; |
44e36b42 | 399 | struct hlist_head *ndst = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
400 | int i; |
401 | ||
402 | if (!ndst) | |
403 | return; | |
404 | ||
405 | write_lock_bh(&xfrm_policy_lock); | |
406 | ||
407 | for (i = hmask; i >= 0; i--) | |
408 | xfrm_dst_hash_transfer(odst + i, ndst, nhashmask); | |
409 | ||
66caf628 AD |
410 | net->xfrm.policy_bydst[dir].table = ndst; |
411 | net->xfrm.policy_bydst[dir].hmask = nhashmask; | |
2518c7c2 DM |
412 | |
413 | write_unlock_bh(&xfrm_policy_lock); | |
414 | ||
44e36b42 | 415 | xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
416 | } |
417 | ||
66caf628 | 418 | static void xfrm_byidx_resize(struct net *net, int total) |
2518c7c2 | 419 | { |
66caf628 | 420 | unsigned int hmask = net->xfrm.policy_idx_hmask; |
2518c7c2 DM |
421 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
422 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
66caf628 | 423 | struct hlist_head *oidx = net->xfrm.policy_byidx; |
44e36b42 | 424 | struct hlist_head *nidx = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
425 | int i; |
426 | ||
427 | if (!nidx) | |
428 | return; | |
429 | ||
430 | write_lock_bh(&xfrm_policy_lock); | |
431 | ||
432 | for (i = hmask; i >= 0; i--) | |
433 | xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask); | |
434 | ||
66caf628 AD |
435 | net->xfrm.policy_byidx = nidx; |
436 | net->xfrm.policy_idx_hmask = nhashmask; | |
2518c7c2 DM |
437 | |
438 | write_unlock_bh(&xfrm_policy_lock); | |
439 | ||
44e36b42 | 440 | xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
441 | } |
442 | ||
66caf628 | 443 | static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total) |
2518c7c2 | 444 | { |
66caf628 AD |
445 | unsigned int cnt = net->xfrm.policy_count[dir]; |
446 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; | |
2518c7c2 DM |
447 | |
448 | if (total) | |
449 | *total += cnt; | |
450 | ||
451 | if ((hmask + 1) < xfrm_policy_hashmax && | |
452 | cnt > hmask) | |
453 | return 1; | |
454 | ||
455 | return 0; | |
456 | } | |
457 | ||
66caf628 | 458 | static inline int xfrm_byidx_should_resize(struct net *net, int total) |
2518c7c2 | 459 | { |
66caf628 | 460 | unsigned int hmask = net->xfrm.policy_idx_hmask; |
2518c7c2 DM |
461 | |
462 | if ((hmask + 1) < xfrm_policy_hashmax && | |
463 | total > hmask) | |
464 | return 1; | |
465 | ||
466 | return 0; | |
467 | } | |
468 | ||
5a6d3416 | 469 | void xfrm_spd_getinfo(struct xfrmk_spdinfo *si) |
ecfd6b18 JHS |
470 | { |
471 | read_lock_bh(&xfrm_policy_lock); | |
dc2caba7 AD |
472 | si->incnt = init_net.xfrm.policy_count[XFRM_POLICY_IN]; |
473 | si->outcnt = init_net.xfrm.policy_count[XFRM_POLICY_OUT]; | |
474 | si->fwdcnt = init_net.xfrm.policy_count[XFRM_POLICY_FWD]; | |
475 | si->inscnt = init_net.xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX]; | |
476 | si->outscnt = init_net.xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX]; | |
477 | si->fwdscnt = init_net.xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX]; | |
8100bea7 | 478 | si->spdhcnt = init_net.xfrm.policy_idx_hmask; |
ecfd6b18 JHS |
479 | si->spdhmcnt = xfrm_policy_hashmax; |
480 | read_unlock_bh(&xfrm_policy_lock); | |
481 | } | |
482 | EXPORT_SYMBOL(xfrm_spd_getinfo); | |
2518c7c2 | 483 | |
ecfd6b18 | 484 | static DEFINE_MUTEX(hash_resize_mutex); |
66caf628 | 485 | static void xfrm_hash_resize(struct work_struct *work) |
2518c7c2 | 486 | { |
66caf628 | 487 | struct net *net = container_of(work, struct net, xfrm.policy_hash_work); |
2518c7c2 DM |
488 | int dir, total; |
489 | ||
490 | mutex_lock(&hash_resize_mutex); | |
491 | ||
492 | total = 0; | |
493 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
66caf628 AD |
494 | if (xfrm_bydst_should_resize(net, dir, &total)) |
495 | xfrm_bydst_resize(net, dir); | |
2518c7c2 | 496 | } |
66caf628 AD |
497 | if (xfrm_byidx_should_resize(net, total)) |
498 | xfrm_byidx_resize(net, total); | |
2518c7c2 DM |
499 | |
500 | mutex_unlock(&hash_resize_mutex); | |
501 | } | |
502 | ||
1da177e4 LT |
503 | /* Generate new index... KAME seems to generate them ordered by cost |
504 | * of an absolute inpredictability of ordering of rules. This will not pass. */ | |
1121994c | 505 | static u32 xfrm_gen_index(struct net *net, int dir) |
1da177e4 | 506 | { |
1da177e4 LT |
507 | static u32 idx_generator; |
508 | ||
509 | for (;;) { | |
2518c7c2 DM |
510 | struct hlist_node *entry; |
511 | struct hlist_head *list; | |
512 | struct xfrm_policy *p; | |
513 | u32 idx; | |
514 | int found; | |
515 | ||
1da177e4 LT |
516 | idx = (idx_generator | dir); |
517 | idx_generator += 8; | |
518 | if (idx == 0) | |
519 | idx = 8; | |
1121994c | 520 | list = net->xfrm.policy_byidx + idx_hash(net, idx); |
2518c7c2 DM |
521 | found = 0; |
522 | hlist_for_each_entry(p, entry, list, byidx) { | |
523 | if (p->index == idx) { | |
524 | found = 1; | |
1da177e4 | 525 | break; |
2518c7c2 | 526 | } |
1da177e4 | 527 | } |
2518c7c2 | 528 | if (!found) |
1da177e4 LT |
529 | return idx; |
530 | } | |
531 | } | |
532 | ||
2518c7c2 DM |
533 | static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2) |
534 | { | |
535 | u32 *p1 = (u32 *) s1; | |
536 | u32 *p2 = (u32 *) s2; | |
537 | int len = sizeof(struct xfrm_selector) / sizeof(u32); | |
538 | int i; | |
539 | ||
540 | for (i = 0; i < len; i++) { | |
541 | if (p1[i] != p2[i]) | |
542 | return 1; | |
543 | } | |
544 | ||
545 | return 0; | |
546 | } | |
547 | ||
1da177e4 LT |
548 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) |
549 | { | |
1121994c | 550 | struct net *net = xp_net(policy); |
2518c7c2 DM |
551 | struct xfrm_policy *pol; |
552 | struct xfrm_policy *delpol; | |
553 | struct hlist_head *chain; | |
a6c7ab55 | 554 | struct hlist_node *entry, *newpos; |
9b78a82c | 555 | struct dst_entry *gc_list; |
1da177e4 LT |
556 | |
557 | write_lock_bh(&xfrm_policy_lock); | |
1121994c | 558 | chain = policy_hash_bysel(net, &policy->selector, policy->family, dir); |
2518c7c2 DM |
559 | delpol = NULL; |
560 | newpos = NULL; | |
2518c7c2 | 561 | hlist_for_each_entry(pol, entry, chain, bydst) { |
a6c7ab55 | 562 | if (pol->type == policy->type && |
2518c7c2 | 563 | !selector_cmp(&pol->selector, &policy->selector) && |
a6c7ab55 HX |
564 | xfrm_sec_ctx_match(pol->security, policy->security) && |
565 | !WARN_ON(delpol)) { | |
1da177e4 LT |
566 | if (excl) { |
567 | write_unlock_bh(&xfrm_policy_lock); | |
568 | return -EEXIST; | |
569 | } | |
1da177e4 LT |
570 | delpol = pol; |
571 | if (policy->priority > pol->priority) | |
572 | continue; | |
573 | } else if (policy->priority >= pol->priority) { | |
a6c7ab55 | 574 | newpos = &pol->bydst; |
1da177e4 LT |
575 | continue; |
576 | } | |
1da177e4 LT |
577 | if (delpol) |
578 | break; | |
1da177e4 LT |
579 | } |
580 | if (newpos) | |
2518c7c2 DM |
581 | hlist_add_after(newpos, &policy->bydst); |
582 | else | |
583 | hlist_add_head(&policy->bydst, chain); | |
1da177e4 | 584 | xfrm_pol_hold(policy); |
1121994c | 585 | net->xfrm.policy_count[dir]++; |
1da177e4 | 586 | atomic_inc(&flow_cache_genid); |
2518c7c2 DM |
587 | if (delpol) { |
588 | hlist_del(&delpol->bydst); | |
589 | hlist_del(&delpol->byidx); | |
12a169e7 | 590 | list_del(&delpol->walk.all); |
1121994c | 591 | net->xfrm.policy_count[dir]--; |
2518c7c2 | 592 | } |
1121994c AD |
593 | policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir); |
594 | hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index)); | |
9d729f72 | 595 | policy->curlft.add_time = get_seconds(); |
1da177e4 LT |
596 | policy->curlft.use_time = 0; |
597 | if (!mod_timer(&policy->timer, jiffies + HZ)) | |
598 | xfrm_pol_hold(policy); | |
1121994c | 599 | list_add(&policy->walk.all, &net->xfrm.policy_all); |
1da177e4 LT |
600 | write_unlock_bh(&xfrm_policy_lock); |
601 | ||
9b78a82c | 602 | if (delpol) |
1da177e4 | 603 | xfrm_policy_kill(delpol); |
1121994c AD |
604 | else if (xfrm_bydst_should_resize(net, dir, NULL)) |
605 | schedule_work(&net->xfrm.policy_hash_work); | |
9b78a82c DM |
606 | |
607 | read_lock_bh(&xfrm_policy_lock); | |
608 | gc_list = NULL; | |
2518c7c2 DM |
609 | entry = &policy->bydst; |
610 | hlist_for_each_entry_continue(policy, entry, bydst) { | |
9b78a82c DM |
611 | struct dst_entry *dst; |
612 | ||
613 | write_lock(&policy->lock); | |
614 | dst = policy->bundles; | |
615 | if (dst) { | |
616 | struct dst_entry *tail = dst; | |
617 | while (tail->next) | |
618 | tail = tail->next; | |
619 | tail->next = gc_list; | |
620 | gc_list = dst; | |
621 | ||
622 | policy->bundles = NULL; | |
623 | } | |
624 | write_unlock(&policy->lock); | |
1da177e4 | 625 | } |
9b78a82c DM |
626 | read_unlock_bh(&xfrm_policy_lock); |
627 | ||
628 | while (gc_list) { | |
629 | struct dst_entry *dst = gc_list; | |
630 | ||
631 | gc_list = dst->next; | |
632 | dst_free(dst); | |
633 | } | |
634 | ||
1da177e4 LT |
635 | return 0; |
636 | } | |
637 | EXPORT_SYMBOL(xfrm_policy_insert); | |
638 | ||
8d1211a6 | 639 | struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u8 type, int dir, |
4e81bb83 | 640 | struct xfrm_selector *sel, |
ef41aaa0 EP |
641 | struct xfrm_sec_ctx *ctx, int delete, |
642 | int *err) | |
1da177e4 | 643 | { |
2518c7c2 DM |
644 | struct xfrm_policy *pol, *ret; |
645 | struct hlist_head *chain; | |
646 | struct hlist_node *entry; | |
1da177e4 | 647 | |
ef41aaa0 | 648 | *err = 0; |
1da177e4 | 649 | write_lock_bh(&xfrm_policy_lock); |
8d1211a6 | 650 | chain = policy_hash_bysel(net, sel, sel->family, dir); |
2518c7c2 DM |
651 | ret = NULL; |
652 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
653 | if (pol->type == type && | |
654 | !selector_cmp(sel, &pol->selector) && | |
655 | xfrm_sec_ctx_match(ctx, pol->security)) { | |
1da177e4 | 656 | xfrm_pol_hold(pol); |
2518c7c2 | 657 | if (delete) { |
03e1ad7b PM |
658 | *err = security_xfrm_policy_delete( |
659 | pol->security); | |
ef41aaa0 EP |
660 | if (*err) { |
661 | write_unlock_bh(&xfrm_policy_lock); | |
662 | return pol; | |
663 | } | |
2518c7c2 DM |
664 | hlist_del(&pol->bydst); |
665 | hlist_del(&pol->byidx); | |
12a169e7 | 666 | list_del(&pol->walk.all); |
8d1211a6 | 667 | net->xfrm.policy_count[dir]--; |
2518c7c2 DM |
668 | } |
669 | ret = pol; | |
1da177e4 LT |
670 | break; |
671 | } | |
672 | } | |
673 | write_unlock_bh(&xfrm_policy_lock); | |
674 | ||
2518c7c2 | 675 | if (ret && delete) { |
1da177e4 | 676 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 677 | xfrm_policy_kill(ret); |
1da177e4 | 678 | } |
2518c7c2 | 679 | return ret; |
1da177e4 | 680 | } |
df71837d | 681 | EXPORT_SYMBOL(xfrm_policy_bysel_ctx); |
1da177e4 | 682 | |
8d1211a6 AD |
683 | struct xfrm_policy *xfrm_policy_byid(struct net *net, u8 type, int dir, u32 id, |
684 | int delete, int *err) | |
1da177e4 | 685 | { |
2518c7c2 DM |
686 | struct xfrm_policy *pol, *ret; |
687 | struct hlist_head *chain; | |
688 | struct hlist_node *entry; | |
1da177e4 | 689 | |
b5505c6e HX |
690 | *err = -ENOENT; |
691 | if (xfrm_policy_id2dir(id) != dir) | |
692 | return NULL; | |
693 | ||
ef41aaa0 | 694 | *err = 0; |
1da177e4 | 695 | write_lock_bh(&xfrm_policy_lock); |
8d1211a6 | 696 | chain = net->xfrm.policy_byidx + idx_hash(net, id); |
2518c7c2 DM |
697 | ret = NULL; |
698 | hlist_for_each_entry(pol, entry, chain, byidx) { | |
699 | if (pol->type == type && pol->index == id) { | |
1da177e4 | 700 | xfrm_pol_hold(pol); |
2518c7c2 | 701 | if (delete) { |
03e1ad7b PM |
702 | *err = security_xfrm_policy_delete( |
703 | pol->security); | |
ef41aaa0 EP |
704 | if (*err) { |
705 | write_unlock_bh(&xfrm_policy_lock); | |
706 | return pol; | |
707 | } | |
2518c7c2 DM |
708 | hlist_del(&pol->bydst); |
709 | hlist_del(&pol->byidx); | |
12a169e7 | 710 | list_del(&pol->walk.all); |
8d1211a6 | 711 | net->xfrm.policy_count[dir]--; |
2518c7c2 DM |
712 | } |
713 | ret = pol; | |
1da177e4 LT |
714 | break; |
715 | } | |
716 | } | |
717 | write_unlock_bh(&xfrm_policy_lock); | |
718 | ||
2518c7c2 | 719 | if (ret && delete) { |
1da177e4 | 720 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 721 | xfrm_policy_kill(ret); |
1da177e4 | 722 | } |
2518c7c2 | 723 | return ret; |
1da177e4 LT |
724 | } |
725 | EXPORT_SYMBOL(xfrm_policy_byid); | |
726 | ||
4aa2e62c JL |
727 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
728 | static inline int | |
33ffbbd5 | 729 | xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info) |
1da177e4 | 730 | { |
4aa2e62c JL |
731 | int dir, err = 0; |
732 | ||
733 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { | |
734 | struct xfrm_policy *pol; | |
735 | struct hlist_node *entry; | |
736 | int i; | |
737 | ||
738 | hlist_for_each_entry(pol, entry, | |
33ffbbd5 | 739 | &net->xfrm.policy_inexact[dir], bydst) { |
4aa2e62c JL |
740 | if (pol->type != type) |
741 | continue; | |
03e1ad7b | 742 | err = security_xfrm_policy_delete(pol->security); |
4aa2e62c | 743 | if (err) { |
ab5f5e8b JL |
744 | xfrm_audit_policy_delete(pol, 0, |
745 | audit_info->loginuid, | |
2532386f | 746 | audit_info->sessionid, |
ab5f5e8b | 747 | audit_info->secid); |
4aa2e62c JL |
748 | return err; |
749 | } | |
7dc12d6d | 750 | } |
33ffbbd5 | 751 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { |
4aa2e62c | 752 | hlist_for_each_entry(pol, entry, |
33ffbbd5 | 753 | net->xfrm.policy_bydst[dir].table + i, |
4aa2e62c JL |
754 | bydst) { |
755 | if (pol->type != type) | |
756 | continue; | |
03e1ad7b PM |
757 | err = security_xfrm_policy_delete( |
758 | pol->security); | |
4aa2e62c | 759 | if (err) { |
ab5f5e8b JL |
760 | xfrm_audit_policy_delete(pol, 0, |
761 | audit_info->loginuid, | |
2532386f | 762 | audit_info->sessionid, |
ab5f5e8b | 763 | audit_info->secid); |
4aa2e62c JL |
764 | return err; |
765 | } | |
766 | } | |
767 | } | |
768 | } | |
769 | return err; | |
770 | } | |
771 | #else | |
772 | static inline int | |
33ffbbd5 | 773 | xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info) |
4aa2e62c JL |
774 | { |
775 | return 0; | |
776 | } | |
777 | #endif | |
778 | ||
33ffbbd5 | 779 | int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info) |
4aa2e62c JL |
780 | { |
781 | int dir, err = 0; | |
1da177e4 LT |
782 | |
783 | write_lock_bh(&xfrm_policy_lock); | |
4aa2e62c | 784 | |
33ffbbd5 | 785 | err = xfrm_policy_flush_secctx_check(net, type, audit_info); |
4aa2e62c JL |
786 | if (err) |
787 | goto out; | |
788 | ||
1da177e4 | 789 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
2518c7c2 DM |
790 | struct xfrm_policy *pol; |
791 | struct hlist_node *entry; | |
ae8c0577 | 792 | int i, killed; |
2518c7c2 | 793 | |
ae8c0577 | 794 | killed = 0; |
2518c7c2 DM |
795 | again1: |
796 | hlist_for_each_entry(pol, entry, | |
33ffbbd5 | 797 | &net->xfrm.policy_inexact[dir], bydst) { |
2518c7c2 DM |
798 | if (pol->type != type) |
799 | continue; | |
800 | hlist_del(&pol->bydst); | |
801 | hlist_del(&pol->byidx); | |
d5654efd | 802 | list_del(&pol->walk.all); |
1da177e4 LT |
803 | write_unlock_bh(&xfrm_policy_lock); |
804 | ||
ab5f5e8b | 805 | xfrm_audit_policy_delete(pol, 1, audit_info->loginuid, |
2532386f | 806 | audit_info->sessionid, |
ab5f5e8b | 807 | audit_info->secid); |
161a09e7 | 808 | |
2518c7c2 | 809 | xfrm_policy_kill(pol); |
ae8c0577 | 810 | killed++; |
1da177e4 LT |
811 | |
812 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
813 | goto again1; |
814 | } | |
815 | ||
33ffbbd5 | 816 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { |
2518c7c2 DM |
817 | again2: |
818 | hlist_for_each_entry(pol, entry, | |
33ffbbd5 | 819 | net->xfrm.policy_bydst[dir].table + i, |
2518c7c2 DM |
820 | bydst) { |
821 | if (pol->type != type) | |
822 | continue; | |
823 | hlist_del(&pol->bydst); | |
824 | hlist_del(&pol->byidx); | |
12a169e7 | 825 | list_del(&pol->walk.all); |
2518c7c2 DM |
826 | write_unlock_bh(&xfrm_policy_lock); |
827 | ||
ab5f5e8b JL |
828 | xfrm_audit_policy_delete(pol, 1, |
829 | audit_info->loginuid, | |
2532386f | 830 | audit_info->sessionid, |
ab5f5e8b | 831 | audit_info->secid); |
2518c7c2 | 832 | xfrm_policy_kill(pol); |
ae8c0577 | 833 | killed++; |
2518c7c2 DM |
834 | |
835 | write_lock_bh(&xfrm_policy_lock); | |
836 | goto again2; | |
837 | } | |
1da177e4 | 838 | } |
2518c7c2 | 839 | |
33ffbbd5 | 840 | net->xfrm.policy_count[dir] -= killed; |
1da177e4 LT |
841 | } |
842 | atomic_inc(&flow_cache_genid); | |
4aa2e62c | 843 | out: |
1da177e4 | 844 | write_unlock_bh(&xfrm_policy_lock); |
4aa2e62c | 845 | return err; |
1da177e4 LT |
846 | } |
847 | EXPORT_SYMBOL(xfrm_policy_flush); | |
848 | ||
cdcbca7c | 849 | int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, |
4c563f76 | 850 | int (*func)(struct xfrm_policy *, int, int, void*), |
1da177e4 LT |
851 | void *data) |
852 | { | |
12a169e7 HX |
853 | struct xfrm_policy *pol; |
854 | struct xfrm_policy_walk_entry *x; | |
4c563f76 TT |
855 | int error = 0; |
856 | ||
857 | if (walk->type >= XFRM_POLICY_TYPE_MAX && | |
858 | walk->type != XFRM_POLICY_TYPE_ANY) | |
859 | return -EINVAL; | |
1da177e4 | 860 | |
12a169e7 | 861 | if (list_empty(&walk->walk.all) && walk->seq != 0) |
4c563f76 TT |
862 | return 0; |
863 | ||
12a169e7 HX |
864 | write_lock_bh(&xfrm_policy_lock); |
865 | if (list_empty(&walk->walk.all)) | |
cdcbca7c | 866 | x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all); |
12a169e7 HX |
867 | else |
868 | x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all); | |
cdcbca7c | 869 | list_for_each_entry_from(x, &net->xfrm.policy_all, all) { |
12a169e7 | 870 | if (x->dead) |
4c563f76 | 871 | continue; |
12a169e7 HX |
872 | pol = container_of(x, struct xfrm_policy, walk); |
873 | if (walk->type != XFRM_POLICY_TYPE_ANY && | |
874 | walk->type != pol->type) | |
875 | continue; | |
876 | error = func(pol, xfrm_policy_id2dir(pol->index), | |
877 | walk->seq, data); | |
878 | if (error) { | |
879 | list_move_tail(&walk->walk.all, &x->all); | |
880 | goto out; | |
2518c7c2 | 881 | } |
12a169e7 | 882 | walk->seq++; |
1da177e4 | 883 | } |
12a169e7 | 884 | if (walk->seq == 0) { |
baf5d743 JHS |
885 | error = -ENOENT; |
886 | goto out; | |
887 | } | |
12a169e7 | 888 | list_del_init(&walk->walk.all); |
1da177e4 | 889 | out: |
12a169e7 | 890 | write_unlock_bh(&xfrm_policy_lock); |
1da177e4 LT |
891 | return error; |
892 | } | |
893 | EXPORT_SYMBOL(xfrm_policy_walk); | |
894 | ||
12a169e7 HX |
895 | void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type) |
896 | { | |
897 | INIT_LIST_HEAD(&walk->walk.all); | |
898 | walk->walk.dead = 1; | |
899 | walk->type = type; | |
900 | walk->seq = 0; | |
901 | } | |
902 | EXPORT_SYMBOL(xfrm_policy_walk_init); | |
903 | ||
904 | void xfrm_policy_walk_done(struct xfrm_policy_walk *walk) | |
905 | { | |
906 | if (list_empty(&walk->walk.all)) | |
907 | return; | |
908 | ||
909 | write_lock_bh(&xfrm_policy_lock); | |
910 | list_del(&walk->walk.all); | |
911 | write_unlock_bh(&xfrm_policy_lock); | |
912 | } | |
913 | EXPORT_SYMBOL(xfrm_policy_walk_done); | |
914 | ||
134b0fc5 JM |
915 | /* |
916 | * Find policy to apply to this flow. | |
917 | * | |
918 | * Returns 0 if policy found, else an -errno. | |
919 | */ | |
2518c7c2 DM |
920 | static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl, |
921 | u8 type, u16 family, int dir) | |
1da177e4 | 922 | { |
2518c7c2 | 923 | struct xfrm_selector *sel = &pol->selector; |
134b0fc5 | 924 | int match, ret = -ESRCH; |
1da177e4 | 925 | |
2518c7c2 DM |
926 | if (pol->family != family || |
927 | pol->type != type) | |
134b0fc5 | 928 | return ret; |
1da177e4 | 929 | |
2518c7c2 | 930 | match = xfrm_selector_match(sel, fl, family); |
134b0fc5 | 931 | if (match) |
03e1ad7b PM |
932 | ret = security_xfrm_policy_lookup(pol->security, fl->secid, |
933 | dir); | |
2518c7c2 | 934 | |
134b0fc5 | 935 | return ret; |
2518c7c2 | 936 | } |
1da177e4 | 937 | |
52479b62 AD |
938 | static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type, |
939 | struct flowi *fl, | |
2518c7c2 DM |
940 | u16 family, u8 dir) |
941 | { | |
134b0fc5 | 942 | int err; |
2518c7c2 DM |
943 | struct xfrm_policy *pol, *ret; |
944 | xfrm_address_t *daddr, *saddr; | |
945 | struct hlist_node *entry; | |
946 | struct hlist_head *chain; | |
acba48e1 | 947 | u32 priority = ~0U; |
df71837d | 948 | |
2518c7c2 DM |
949 | daddr = xfrm_flowi_daddr(fl, family); |
950 | saddr = xfrm_flowi_saddr(fl, family); | |
951 | if (unlikely(!daddr || !saddr)) | |
952 | return NULL; | |
953 | ||
954 | read_lock_bh(&xfrm_policy_lock); | |
52479b62 | 955 | chain = policy_hash_direct(net, daddr, saddr, family, dir); |
2518c7c2 DM |
956 | ret = NULL; |
957 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
958 | err = xfrm_policy_match(pol, fl, type, family, dir); |
959 | if (err) { | |
960 | if (err == -ESRCH) | |
961 | continue; | |
962 | else { | |
963 | ret = ERR_PTR(err); | |
964 | goto fail; | |
965 | } | |
966 | } else { | |
2518c7c2 | 967 | ret = pol; |
acba48e1 | 968 | priority = ret->priority; |
2518c7c2 DM |
969 | break; |
970 | } | |
971 | } | |
52479b62 | 972 | chain = &net->xfrm.policy_inexact[dir]; |
acba48e1 | 973 | hlist_for_each_entry(pol, entry, chain, bydst) { |
134b0fc5 JM |
974 | err = xfrm_policy_match(pol, fl, type, family, dir); |
975 | if (err) { | |
976 | if (err == -ESRCH) | |
977 | continue; | |
978 | else { | |
979 | ret = ERR_PTR(err); | |
980 | goto fail; | |
981 | } | |
982 | } else if (pol->priority < priority) { | |
acba48e1 DM |
983 | ret = pol; |
984 | break; | |
1da177e4 LT |
985 | } |
986 | } | |
acba48e1 DM |
987 | if (ret) |
988 | xfrm_pol_hold(ret); | |
134b0fc5 | 989 | fail: |
1da177e4 | 990 | read_unlock_bh(&xfrm_policy_lock); |
4e81bb83 | 991 | |
2518c7c2 | 992 | return ret; |
4e81bb83 MN |
993 | } |
994 | ||
52479b62 AD |
995 | static int xfrm_policy_lookup(struct net *net, struct flowi *fl, u16 family, |
996 | u8 dir, void **objp, atomic_t **obj_refp) | |
4e81bb83 MN |
997 | { |
998 | struct xfrm_policy *pol; | |
134b0fc5 | 999 | int err = 0; |
4e81bb83 MN |
1000 | |
1001 | #ifdef CONFIG_XFRM_SUB_POLICY | |
52479b62 | 1002 | pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir); |
134b0fc5 JM |
1003 | if (IS_ERR(pol)) { |
1004 | err = PTR_ERR(pol); | |
1005 | pol = NULL; | |
1006 | } | |
1007 | if (pol || err) | |
4e81bb83 MN |
1008 | goto end; |
1009 | #endif | |
52479b62 | 1010 | pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir); |
134b0fc5 JM |
1011 | if (IS_ERR(pol)) { |
1012 | err = PTR_ERR(pol); | |
1013 | pol = NULL; | |
1014 | } | |
4e81bb83 | 1015 | #ifdef CONFIG_XFRM_SUB_POLICY |
2518c7c2 | 1016 | end: |
4e81bb83 | 1017 | #endif |
1da177e4 LT |
1018 | if ((*objp = (void *) pol) != NULL) |
1019 | *obj_refp = &pol->refcnt; | |
134b0fc5 | 1020 | return err; |
1da177e4 LT |
1021 | } |
1022 | ||
df71837d TJ |
1023 | static inline int policy_to_flow_dir(int dir) |
1024 | { | |
1025 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
a716c119 YH |
1026 | XFRM_POLICY_OUT == FLOW_DIR_OUT && |
1027 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
1028 | return dir; | |
1029 | switch (dir) { | |
1030 | default: | |
1031 | case XFRM_POLICY_IN: | |
1032 | return FLOW_DIR_IN; | |
1033 | case XFRM_POLICY_OUT: | |
1034 | return FLOW_DIR_OUT; | |
1035 | case XFRM_POLICY_FWD: | |
1036 | return FLOW_DIR_FWD; | |
3ff50b79 | 1037 | } |
df71837d TJ |
1038 | } |
1039 | ||
e0d1caa7 | 1040 | static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl) |
1da177e4 LT |
1041 | { |
1042 | struct xfrm_policy *pol; | |
1043 | ||
1044 | read_lock_bh(&xfrm_policy_lock); | |
1045 | if ((pol = sk->sk_policy[dir]) != NULL) { | |
a716c119 | 1046 | int match = xfrm_selector_match(&pol->selector, fl, |
1da177e4 | 1047 | sk->sk_family); |
a716c119 | 1048 | int err = 0; |
df71837d | 1049 | |
3bccfbc7 | 1050 | if (match) { |
03e1ad7b PM |
1051 | err = security_xfrm_policy_lookup(pol->security, |
1052 | fl->secid, | |
1053 | policy_to_flow_dir(dir)); | |
3bccfbc7 VY |
1054 | if (!err) |
1055 | xfrm_pol_hold(pol); | |
1056 | else if (err == -ESRCH) | |
1057 | pol = NULL; | |
1058 | else | |
1059 | pol = ERR_PTR(err); | |
1060 | } else | |
1da177e4 LT |
1061 | pol = NULL; |
1062 | } | |
1063 | read_unlock_bh(&xfrm_policy_lock); | |
1064 | return pol; | |
1065 | } | |
1066 | ||
1067 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) | |
1068 | { | |
98806f75 | 1069 | struct net *net = xp_net(pol); |
1121994c | 1070 | struct hlist_head *chain = policy_hash_bysel(net, &pol->selector, |
2518c7c2 | 1071 | pol->family, dir); |
4e81bb83 | 1072 | |
98806f75 | 1073 | list_add(&pol->walk.all, &net->xfrm.policy_all); |
2518c7c2 | 1074 | hlist_add_head(&pol->bydst, chain); |
e92303f8 | 1075 | hlist_add_head(&pol->byidx, net->xfrm.policy_byidx+idx_hash(net, pol->index)); |
98806f75 | 1076 | net->xfrm.policy_count[dir]++; |
1da177e4 | 1077 | xfrm_pol_hold(pol); |
2518c7c2 | 1078 | |
98806f75 AD |
1079 | if (xfrm_bydst_should_resize(net, dir, NULL)) |
1080 | schedule_work(&net->xfrm.policy_hash_work); | |
1da177e4 LT |
1081 | } |
1082 | ||
1083 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, | |
1084 | int dir) | |
1085 | { | |
98806f75 AD |
1086 | struct net *net = xp_net(pol); |
1087 | ||
2518c7c2 DM |
1088 | if (hlist_unhashed(&pol->bydst)) |
1089 | return NULL; | |
1da177e4 | 1090 | |
2518c7c2 DM |
1091 | hlist_del(&pol->bydst); |
1092 | hlist_del(&pol->byidx); | |
12a169e7 | 1093 | list_del(&pol->walk.all); |
98806f75 | 1094 | net->xfrm.policy_count[dir]--; |
2518c7c2 DM |
1095 | |
1096 | return pol; | |
1da177e4 LT |
1097 | } |
1098 | ||
4666faab | 1099 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir) |
1da177e4 LT |
1100 | { |
1101 | write_lock_bh(&xfrm_policy_lock); | |
1102 | pol = __xfrm_policy_unlink(pol, dir); | |
1103 | write_unlock_bh(&xfrm_policy_lock); | |
1104 | if (pol) { | |
1105 | if (dir < XFRM_POLICY_MAX) | |
1106 | atomic_inc(&flow_cache_genid); | |
1107 | xfrm_policy_kill(pol); | |
4666faab | 1108 | return 0; |
1da177e4 | 1109 | } |
4666faab | 1110 | return -ENOENT; |
1da177e4 | 1111 | } |
a70fcb0b | 1112 | EXPORT_SYMBOL(xfrm_policy_delete); |
1da177e4 LT |
1113 | |
1114 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) | |
1115 | { | |
1121994c | 1116 | struct net *net = xp_net(pol); |
1da177e4 LT |
1117 | struct xfrm_policy *old_pol; |
1118 | ||
4e81bb83 MN |
1119 | #ifdef CONFIG_XFRM_SUB_POLICY |
1120 | if (pol && pol->type != XFRM_POLICY_TYPE_MAIN) | |
1121 | return -EINVAL; | |
1122 | #endif | |
1123 | ||
1da177e4 LT |
1124 | write_lock_bh(&xfrm_policy_lock); |
1125 | old_pol = sk->sk_policy[dir]; | |
1126 | sk->sk_policy[dir] = pol; | |
1127 | if (pol) { | |
9d729f72 | 1128 | pol->curlft.add_time = get_seconds(); |
1121994c | 1129 | pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir); |
1da177e4 LT |
1130 | __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir); |
1131 | } | |
1132 | if (old_pol) | |
1133 | __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir); | |
1134 | write_unlock_bh(&xfrm_policy_lock); | |
1135 | ||
1136 | if (old_pol) { | |
1137 | xfrm_policy_kill(old_pol); | |
1138 | } | |
1139 | return 0; | |
1140 | } | |
1141 | ||
1142 | static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir) | |
1143 | { | |
0331b1f3 | 1144 | struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC); |
1da177e4 LT |
1145 | |
1146 | if (newp) { | |
1147 | newp->selector = old->selector; | |
03e1ad7b PM |
1148 | if (security_xfrm_policy_clone(old->security, |
1149 | &newp->security)) { | |
df71837d TJ |
1150 | kfree(newp); |
1151 | return NULL; /* ENOMEM */ | |
1152 | } | |
1da177e4 LT |
1153 | newp->lft = old->lft; |
1154 | newp->curlft = old->curlft; | |
1155 | newp->action = old->action; | |
1156 | newp->flags = old->flags; | |
1157 | newp->xfrm_nr = old->xfrm_nr; | |
1158 | newp->index = old->index; | |
4e81bb83 | 1159 | newp->type = old->type; |
1da177e4 LT |
1160 | memcpy(newp->xfrm_vec, old->xfrm_vec, |
1161 | newp->xfrm_nr*sizeof(struct xfrm_tmpl)); | |
1162 | write_lock_bh(&xfrm_policy_lock); | |
1163 | __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir); | |
1164 | write_unlock_bh(&xfrm_policy_lock); | |
1165 | xfrm_pol_put(newp); | |
1166 | } | |
1167 | return newp; | |
1168 | } | |
1169 | ||
1170 | int __xfrm_sk_clone_policy(struct sock *sk) | |
1171 | { | |
1172 | struct xfrm_policy *p0 = sk->sk_policy[0], | |
1173 | *p1 = sk->sk_policy[1]; | |
1174 | ||
1175 | sk->sk_policy[0] = sk->sk_policy[1] = NULL; | |
1176 | if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL) | |
1177 | return -ENOMEM; | |
1178 | if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL) | |
1179 | return -ENOMEM; | |
1180 | return 0; | |
1181 | } | |
1182 | ||
a1e59abf | 1183 | static int |
fbda33b2 | 1184 | xfrm_get_saddr(struct net *net, xfrm_address_t *local, xfrm_address_t *remote, |
a1e59abf PM |
1185 | unsigned short family) |
1186 | { | |
1187 | int err; | |
1188 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1189 | ||
1190 | if (unlikely(afinfo == NULL)) | |
1191 | return -EINVAL; | |
fbda33b2 | 1192 | err = afinfo->get_saddr(net, local, remote); |
a1e59abf PM |
1193 | xfrm_policy_put_afinfo(afinfo); |
1194 | return err; | |
1195 | } | |
1196 | ||
1da177e4 LT |
1197 | /* Resolve list of templates for the flow, given policy. */ |
1198 | ||
1199 | static int | |
4e81bb83 MN |
1200 | xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl, |
1201 | struct xfrm_state **xfrm, | |
1202 | unsigned short family) | |
1da177e4 | 1203 | { |
fbda33b2 | 1204 | struct net *net = xp_net(policy); |
1da177e4 LT |
1205 | int nx; |
1206 | int i, error; | |
1207 | xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); | |
1208 | xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); | |
a1e59abf | 1209 | xfrm_address_t tmp; |
1da177e4 LT |
1210 | |
1211 | for (nx=0, i = 0; i < policy->xfrm_nr; i++) { | |
1212 | struct xfrm_state *x; | |
1213 | xfrm_address_t *remote = daddr; | |
1214 | xfrm_address_t *local = saddr; | |
1215 | struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; | |
1216 | ||
48b8d783 JK |
1217 | if (tmpl->mode == XFRM_MODE_TUNNEL || |
1218 | tmpl->mode == XFRM_MODE_BEET) { | |
1da177e4 LT |
1219 | remote = &tmpl->id.daddr; |
1220 | local = &tmpl->saddr; | |
76b3f055 | 1221 | family = tmpl->encap_family; |
a1e59abf | 1222 | if (xfrm_addr_any(local, family)) { |
fbda33b2 | 1223 | error = xfrm_get_saddr(net, &tmp, remote, family); |
a1e59abf PM |
1224 | if (error) |
1225 | goto fail; | |
1226 | local = &tmp; | |
1227 | } | |
1da177e4 LT |
1228 | } |
1229 | ||
1230 | x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); | |
1231 | ||
1232 | if (x && x->km.state == XFRM_STATE_VALID) { | |
1233 | xfrm[nx++] = x; | |
1234 | daddr = remote; | |
1235 | saddr = local; | |
1236 | continue; | |
1237 | } | |
1238 | if (x) { | |
1239 | error = (x->km.state == XFRM_STATE_ERROR ? | |
1240 | -EINVAL : -EAGAIN); | |
1241 | xfrm_state_put(x); | |
1242 | } | |
a4322266 | 1243 | else if (error == -ESRCH) |
1244 | error = -EAGAIN; | |
1da177e4 LT |
1245 | |
1246 | if (!tmpl->optional) | |
1247 | goto fail; | |
1248 | } | |
1249 | return nx; | |
1250 | ||
1251 | fail: | |
1252 | for (nx--; nx>=0; nx--) | |
1253 | xfrm_state_put(xfrm[nx]); | |
1254 | return error; | |
1255 | } | |
1256 | ||
4e81bb83 MN |
1257 | static int |
1258 | xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl, | |
1259 | struct xfrm_state **xfrm, | |
1260 | unsigned short family) | |
1261 | { | |
41a49cc3 MN |
1262 | struct xfrm_state *tp[XFRM_MAX_DEPTH]; |
1263 | struct xfrm_state **tpp = (npols > 1) ? tp : xfrm; | |
4e81bb83 MN |
1264 | int cnx = 0; |
1265 | int error; | |
1266 | int ret; | |
1267 | int i; | |
1268 | ||
1269 | for (i = 0; i < npols; i++) { | |
1270 | if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
1271 | error = -ENOBUFS; | |
1272 | goto fail; | |
1273 | } | |
41a49cc3 MN |
1274 | |
1275 | ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family); | |
4e81bb83 MN |
1276 | if (ret < 0) { |
1277 | error = ret; | |
1278 | goto fail; | |
1279 | } else | |
1280 | cnx += ret; | |
1281 | } | |
1282 | ||
41a49cc3 MN |
1283 | /* found states are sorted for outbound processing */ |
1284 | if (npols > 1) | |
1285 | xfrm_state_sort(xfrm, tpp, cnx, family); | |
1286 | ||
4e81bb83 MN |
1287 | return cnx; |
1288 | ||
1289 | fail: | |
1290 | for (cnx--; cnx>=0; cnx--) | |
41a49cc3 | 1291 | xfrm_state_put(tpp[cnx]); |
4e81bb83 MN |
1292 | return error; |
1293 | ||
1294 | } | |
1295 | ||
1da177e4 LT |
1296 | /* Check that the bundle accepts the flow and its components are |
1297 | * still valid. | |
1298 | */ | |
1299 | ||
1300 | static struct dst_entry * | |
1301 | xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short family) | |
1302 | { | |
1303 | struct dst_entry *x; | |
1304 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1305 | if (unlikely(afinfo == NULL)) | |
1306 | return ERR_PTR(-EINVAL); | |
1307 | x = afinfo->find_bundle(fl, policy); | |
1308 | xfrm_policy_put_afinfo(afinfo); | |
1309 | return x; | |
1310 | } | |
1311 | ||
25ee3286 HX |
1312 | static inline int xfrm_get_tos(struct flowi *fl, int family) |
1313 | { | |
1314 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1315 | int tos; | |
1da177e4 | 1316 | |
25ee3286 HX |
1317 | if (!afinfo) |
1318 | return -EINVAL; | |
1319 | ||
1320 | tos = afinfo->get_tos(fl); | |
1321 | ||
1322 | xfrm_policy_put_afinfo(afinfo); | |
1323 | ||
1324 | return tos; | |
1325 | } | |
1326 | ||
1327 | static inline struct xfrm_dst *xfrm_alloc_dst(int family) | |
1da177e4 | 1328 | { |
1da177e4 | 1329 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
25ee3286 HX |
1330 | struct xfrm_dst *xdst; |
1331 | ||
1332 | if (!afinfo) | |
1333 | return ERR_PTR(-EINVAL); | |
1334 | ||
1335 | xdst = dst_alloc(afinfo->dst_ops) ?: ERR_PTR(-ENOBUFS); | |
1336 | ||
1337 | xfrm_policy_put_afinfo(afinfo); | |
1338 | ||
1339 | return xdst; | |
1340 | } | |
1341 | ||
a1b05140 MN |
1342 | static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst, |
1343 | int nfheader_len) | |
1344 | { | |
1345 | struct xfrm_policy_afinfo *afinfo = | |
1346 | xfrm_policy_get_afinfo(dst->ops->family); | |
1347 | int err; | |
1348 | ||
1349 | if (!afinfo) | |
1350 | return -EINVAL; | |
1351 | ||
1352 | err = afinfo->init_path(path, dst, nfheader_len); | |
1353 | ||
1354 | xfrm_policy_put_afinfo(afinfo); | |
1355 | ||
1356 | return err; | |
1357 | } | |
1358 | ||
25ee3286 HX |
1359 | static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev) |
1360 | { | |
1361 | struct xfrm_policy_afinfo *afinfo = | |
1362 | xfrm_policy_get_afinfo(xdst->u.dst.ops->family); | |
1363 | int err; | |
1364 | ||
1365 | if (!afinfo) | |
1da177e4 | 1366 | return -EINVAL; |
25ee3286 HX |
1367 | |
1368 | err = afinfo->fill_dst(xdst, dev); | |
1369 | ||
1da177e4 | 1370 | xfrm_policy_put_afinfo(afinfo); |
25ee3286 | 1371 | |
1da177e4 LT |
1372 | return err; |
1373 | } | |
1374 | ||
25ee3286 HX |
1375 | /* Allocate chain of dst_entry's, attach known xfrm's, calculate |
1376 | * all the metrics... Shortly, bundle a bundle. | |
1377 | */ | |
1378 | ||
1379 | static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy, | |
1380 | struct xfrm_state **xfrm, int nx, | |
1381 | struct flowi *fl, | |
1382 | struct dst_entry *dst) | |
1383 | { | |
1384 | unsigned long now = jiffies; | |
1385 | struct net_device *dev; | |
1386 | struct dst_entry *dst_prev = NULL; | |
1387 | struct dst_entry *dst0 = NULL; | |
1388 | int i = 0; | |
1389 | int err; | |
1390 | int header_len = 0; | |
a1b05140 | 1391 | int nfheader_len = 0; |
25ee3286 HX |
1392 | int trailer_len = 0; |
1393 | int tos; | |
1394 | int family = policy->selector.family; | |
9bb182a7 YH |
1395 | xfrm_address_t saddr, daddr; |
1396 | ||
1397 | xfrm_flowi_addr_get(fl, &saddr, &daddr, family); | |
25ee3286 HX |
1398 | |
1399 | tos = xfrm_get_tos(fl, family); | |
1400 | err = tos; | |
1401 | if (tos < 0) | |
1402 | goto put_states; | |
1403 | ||
1404 | dst_hold(dst); | |
1405 | ||
1406 | for (; i < nx; i++) { | |
1407 | struct xfrm_dst *xdst = xfrm_alloc_dst(family); | |
1408 | struct dst_entry *dst1 = &xdst->u.dst; | |
1409 | ||
1410 | err = PTR_ERR(xdst); | |
1411 | if (IS_ERR(xdst)) { | |
1412 | dst_release(dst); | |
1413 | goto put_states; | |
1414 | } | |
1415 | ||
1416 | if (!dst_prev) | |
1417 | dst0 = dst1; | |
1418 | else { | |
1419 | dst_prev->child = dst_clone(dst1); | |
1420 | dst1->flags |= DST_NOHASH; | |
1421 | } | |
1422 | ||
1423 | xdst->route = dst; | |
1424 | memcpy(&dst1->metrics, &dst->metrics, sizeof(dst->metrics)); | |
1425 | ||
1426 | if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) { | |
1427 | family = xfrm[i]->props.family; | |
9bb182a7 YH |
1428 | dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr, |
1429 | family); | |
25ee3286 HX |
1430 | err = PTR_ERR(dst); |
1431 | if (IS_ERR(dst)) | |
1432 | goto put_states; | |
1433 | } else | |
1434 | dst_hold(dst); | |
1435 | ||
1436 | dst1->xfrm = xfrm[i]; | |
1437 | xdst->genid = xfrm[i]->genid; | |
1438 | ||
1439 | dst1->obsolete = -1; | |
1440 | dst1->flags |= DST_HOST; | |
1441 | dst1->lastuse = now; | |
1442 | ||
1443 | dst1->input = dst_discard; | |
1444 | dst1->output = xfrm[i]->outer_mode->afinfo->output; | |
1445 | ||
1446 | dst1->next = dst_prev; | |
1447 | dst_prev = dst1; | |
1448 | ||
1449 | header_len += xfrm[i]->props.header_len; | |
a1b05140 MN |
1450 | if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT) |
1451 | nfheader_len += xfrm[i]->props.header_len; | |
25ee3286 HX |
1452 | trailer_len += xfrm[i]->props.trailer_len; |
1453 | } | |
1454 | ||
1455 | dst_prev->child = dst; | |
1456 | dst0->path = dst; | |
1457 | ||
1458 | err = -ENODEV; | |
1459 | dev = dst->dev; | |
1460 | if (!dev) | |
1461 | goto free_dst; | |
1462 | ||
1463 | /* Copy neighbout for reachability confirmation */ | |
1464 | dst0->neighbour = neigh_clone(dst->neighbour); | |
1465 | ||
a1b05140 | 1466 | xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len); |
25ee3286 HX |
1467 | xfrm_init_pmtu(dst_prev); |
1468 | ||
1469 | for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) { | |
1470 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev; | |
1471 | ||
1472 | err = xfrm_fill_dst(xdst, dev); | |
1473 | if (err) | |
1474 | goto free_dst; | |
1475 | ||
1476 | dst_prev->header_len = header_len; | |
1477 | dst_prev->trailer_len = trailer_len; | |
1478 | header_len -= xdst->u.dst.xfrm->props.header_len; | |
1479 | trailer_len -= xdst->u.dst.xfrm->props.trailer_len; | |
1480 | } | |
1481 | ||
1482 | out: | |
1483 | return dst0; | |
1484 | ||
1485 | put_states: | |
1486 | for (; i < nx; i++) | |
1487 | xfrm_state_put(xfrm[i]); | |
1488 | free_dst: | |
1489 | if (dst0) | |
1490 | dst_free(dst0); | |
1491 | dst0 = ERR_PTR(err); | |
1492 | goto out; | |
1493 | } | |
1494 | ||
157bfc25 MN |
1495 | static int inline |
1496 | xfrm_dst_alloc_copy(void **target, void *src, int size) | |
1497 | { | |
1498 | if (!*target) { | |
1499 | *target = kmalloc(size, GFP_ATOMIC); | |
1500 | if (!*target) | |
1501 | return -ENOMEM; | |
1502 | } | |
1503 | memcpy(*target, src, size); | |
1504 | return 0; | |
1505 | } | |
1506 | ||
1507 | static int inline | |
1508 | xfrm_dst_update_parent(struct dst_entry *dst, struct xfrm_selector *sel) | |
1509 | { | |
1510 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1511 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1512 | return xfrm_dst_alloc_copy((void **)&(xdst->partner), | |
1513 | sel, sizeof(*sel)); | |
1514 | #else | |
1515 | return 0; | |
1516 | #endif | |
1517 | } | |
1518 | ||
1519 | static int inline | |
1520 | xfrm_dst_update_origin(struct dst_entry *dst, struct flowi *fl) | |
1521 | { | |
1522 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1523 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1524 | return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl)); | |
1525 | #else | |
1526 | return 0; | |
1527 | #endif | |
1528 | } | |
1da177e4 LT |
1529 | |
1530 | static int stale_bundle(struct dst_entry *dst); | |
1531 | ||
1532 | /* Main function: finds/creates a bundle for given flow. | |
1533 | * | |
1534 | * At the moment we eat a raw IP route. Mostly to speed up lookups | |
1535 | * on interfaces with disabled IPsec. | |
1536 | */ | |
52479b62 | 1537 | int __xfrm_lookup(struct net *net, struct dst_entry **dst_p, struct flowi *fl, |
14e50e57 | 1538 | struct sock *sk, int flags) |
1da177e4 LT |
1539 | { |
1540 | struct xfrm_policy *policy; | |
4e81bb83 MN |
1541 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
1542 | int npols; | |
1543 | int pol_dead; | |
1544 | int xfrm_nr; | |
1545 | int pi; | |
1da177e4 LT |
1546 | struct xfrm_state *xfrm[XFRM_MAX_DEPTH]; |
1547 | struct dst_entry *dst, *dst_orig = *dst_p; | |
1548 | int nx = 0; | |
1549 | int err; | |
1550 | u32 genid; | |
42cf93cd | 1551 | u16 family; |
df71837d | 1552 | u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT); |
e0d1caa7 | 1553 | |
1da177e4 LT |
1554 | restart: |
1555 | genid = atomic_read(&flow_cache_genid); | |
1556 | policy = NULL; | |
4e81bb83 MN |
1557 | for (pi = 0; pi < ARRAY_SIZE(pols); pi++) |
1558 | pols[pi] = NULL; | |
1559 | npols = 0; | |
1560 | pol_dead = 0; | |
1561 | xfrm_nr = 0; | |
1562 | ||
f7944fb1 | 1563 | if (sk && sk->sk_policy[XFRM_POLICY_OUT]) { |
e0d1caa7 | 1564 | policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl); |
75b8c133 | 1565 | err = PTR_ERR(policy); |
0aa64774 | 1566 | if (IS_ERR(policy)) { |
59c9940e | 1567 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); |
75b8c133 | 1568 | goto dropdst; |
0aa64774 | 1569 | } |
3bccfbc7 | 1570 | } |
1da177e4 LT |
1571 | |
1572 | if (!policy) { | |
1573 | /* To accelerate a bit... */ | |
2518c7c2 | 1574 | if ((dst_orig->flags & DST_NOXFRM) || |
52479b62 | 1575 | !net->xfrm.policy_count[XFRM_POLICY_OUT]) |
8b7817f3 | 1576 | goto nopol; |
1da177e4 | 1577 | |
52479b62 | 1578 | policy = flow_cache_lookup(net, fl, dst_orig->ops->family, |
42cf93cd | 1579 | dir, xfrm_policy_lookup); |
75b8c133 | 1580 | err = PTR_ERR(policy); |
d66e37a9 | 1581 | if (IS_ERR(policy)) { |
59c9940e | 1582 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); |
75b8c133 | 1583 | goto dropdst; |
d66e37a9 | 1584 | } |
1da177e4 LT |
1585 | } |
1586 | ||
1587 | if (!policy) | |
8b7817f3 | 1588 | goto nopol; |
1da177e4 | 1589 | |
42cf93cd | 1590 | family = dst_orig->ops->family; |
4e81bb83 MN |
1591 | pols[0] = policy; |
1592 | npols ++; | |
1593 | xfrm_nr += pols[0]->xfrm_nr; | |
1da177e4 | 1594 | |
aef21785 | 1595 | err = -ENOENT; |
8b7817f3 HX |
1596 | if ((flags & XFRM_LOOKUP_ICMP) && !(policy->flags & XFRM_POLICY_ICMP)) |
1597 | goto error; | |
1598 | ||
1599 | policy->curlft.use_time = get_seconds(); | |
1600 | ||
1da177e4 | 1601 | switch (policy->action) { |
5e5234ff | 1602 | default: |
1da177e4 LT |
1603 | case XFRM_POLICY_BLOCK: |
1604 | /* Prohibit the flow */ | |
59c9940e | 1605 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK); |
e104411b PM |
1606 | err = -EPERM; |
1607 | goto error; | |
1da177e4 LT |
1608 | |
1609 | case XFRM_POLICY_ALLOW: | |
4e81bb83 | 1610 | #ifndef CONFIG_XFRM_SUB_POLICY |
1da177e4 LT |
1611 | if (policy->xfrm_nr == 0) { |
1612 | /* Flow passes not transformed. */ | |
1613 | xfrm_pol_put(policy); | |
1614 | return 0; | |
1615 | } | |
4e81bb83 | 1616 | #endif |
1da177e4 LT |
1617 | |
1618 | /* Try to find matching bundle. | |
1619 | * | |
1620 | * LATER: help from flow cache. It is optional, this | |
1621 | * is required only for output policy. | |
1622 | */ | |
1623 | dst = xfrm_find_bundle(fl, policy, family); | |
1624 | if (IS_ERR(dst)) { | |
59c9940e | 1625 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR); |
e104411b PM |
1626 | err = PTR_ERR(dst); |
1627 | goto error; | |
1da177e4 LT |
1628 | } |
1629 | ||
1630 | if (dst) | |
1631 | break; | |
1632 | ||
4e81bb83 MN |
1633 | #ifdef CONFIG_XFRM_SUB_POLICY |
1634 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
52479b62 AD |
1635 | pols[1] = xfrm_policy_lookup_bytype(net, |
1636 | XFRM_POLICY_TYPE_MAIN, | |
4e81bb83 MN |
1637 | fl, family, |
1638 | XFRM_POLICY_OUT); | |
1639 | if (pols[1]) { | |
134b0fc5 | 1640 | if (IS_ERR(pols[1])) { |
59c9940e | 1641 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); |
134b0fc5 JM |
1642 | err = PTR_ERR(pols[1]); |
1643 | goto error; | |
1644 | } | |
4e81bb83 | 1645 | if (pols[1]->action == XFRM_POLICY_BLOCK) { |
59c9940e | 1646 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK); |
4e81bb83 MN |
1647 | err = -EPERM; |
1648 | goto error; | |
1649 | } | |
1650 | npols ++; | |
1651 | xfrm_nr += pols[1]->xfrm_nr; | |
1652 | } | |
1653 | } | |
1654 | ||
1655 | /* | |
1656 | * Because neither flowi nor bundle information knows about | |
1657 | * transformation template size. On more than one policy usage | |
1658 | * we can realize whether all of them is bypass or not after | |
1659 | * they are searched. See above not-transformed bypass | |
1660 | * is surrounded by non-sub policy configuration, too. | |
1661 | */ | |
1662 | if (xfrm_nr == 0) { | |
1663 | /* Flow passes not transformed. */ | |
1664 | xfrm_pols_put(pols, npols); | |
1665 | return 0; | |
1666 | } | |
1667 | ||
1668 | #endif | |
1669 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); | |
1da177e4 LT |
1670 | |
1671 | if (unlikely(nx<0)) { | |
1672 | err = nx; | |
b27aeadb | 1673 | if (err == -EAGAIN && net->xfrm.sysctl_larval_drop) { |
14e50e57 DM |
1674 | /* EREMOTE tells the caller to generate |
1675 | * a one-shot blackhole route. | |
1676 | */ | |
59c9940e | 1677 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); |
14e50e57 DM |
1678 | xfrm_pol_put(policy); |
1679 | return -EREMOTE; | |
1680 | } | |
815f4e57 | 1681 | if (err == -EAGAIN && (flags & XFRM_LOOKUP_WAIT)) { |
1da177e4 LT |
1682 | DECLARE_WAITQUEUE(wait, current); |
1683 | ||
52479b62 | 1684 | add_wait_queue(&net->xfrm.km_waitq, &wait); |
1da177e4 LT |
1685 | set_current_state(TASK_INTERRUPTIBLE); |
1686 | schedule(); | |
1687 | set_current_state(TASK_RUNNING); | |
52479b62 | 1688 | remove_wait_queue(&net->xfrm.km_waitq, &wait); |
1da177e4 | 1689 | |
4e81bb83 | 1690 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); |
1da177e4 LT |
1691 | |
1692 | if (nx == -EAGAIN && signal_pending(current)) { | |
59c9940e | 1693 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); |
1da177e4 LT |
1694 | err = -ERESTART; |
1695 | goto error; | |
1696 | } | |
1697 | if (nx == -EAGAIN || | |
1698 | genid != atomic_read(&flow_cache_genid)) { | |
4e81bb83 | 1699 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1700 | goto restart; |
1701 | } | |
1702 | err = nx; | |
1703 | } | |
0aa64774 | 1704 | if (err < 0) { |
59c9940e | 1705 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); |
1da177e4 | 1706 | goto error; |
0aa64774 | 1707 | } |
1da177e4 LT |
1708 | } |
1709 | if (nx == 0) { | |
1710 | /* Flow passes not transformed. */ | |
4e81bb83 | 1711 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1712 | return 0; |
1713 | } | |
1714 | ||
25ee3286 HX |
1715 | dst = xfrm_bundle_create(policy, xfrm, nx, fl, dst_orig); |
1716 | err = PTR_ERR(dst); | |
0aa64774 | 1717 | if (IS_ERR(dst)) { |
59c9940e | 1718 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR); |
1da177e4 | 1719 | goto error; |
0aa64774 | 1720 | } |
1da177e4 | 1721 | |
4e81bb83 MN |
1722 | for (pi = 0; pi < npols; pi++) { |
1723 | read_lock_bh(&pols[pi]->lock); | |
12a169e7 | 1724 | pol_dead |= pols[pi]->walk.dead; |
4e81bb83 MN |
1725 | read_unlock_bh(&pols[pi]->lock); |
1726 | } | |
1727 | ||
1da177e4 | 1728 | write_lock_bh(&policy->lock); |
4e81bb83 | 1729 | if (unlikely(pol_dead || stale_bundle(dst))) { |
1da177e4 LT |
1730 | /* Wow! While we worked on resolving, this |
1731 | * policy has gone. Retry. It is not paranoia, | |
1732 | * we just cannot enlist new bundle to dead object. | |
1733 | * We can't enlist stable bundles either. | |
1734 | */ | |
1735 | write_unlock_bh(&policy->lock); | |
9d7d7402 | 1736 | dst_free(dst); |
00de651d | 1737 | |
0aa64774 | 1738 | if (pol_dead) |
59c9940e | 1739 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLDEAD); |
0aa64774 | 1740 | else |
59c9940e | 1741 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR); |
00de651d HX |
1742 | err = -EHOSTUNREACH; |
1743 | goto error; | |
1da177e4 | 1744 | } |
157bfc25 MN |
1745 | |
1746 | if (npols > 1) | |
1747 | err = xfrm_dst_update_parent(dst, &pols[1]->selector); | |
1748 | else | |
1749 | err = xfrm_dst_update_origin(dst, fl); | |
1750 | if (unlikely(err)) { | |
1751 | write_unlock_bh(&policy->lock); | |
9d7d7402 | 1752 | dst_free(dst); |
59c9940e | 1753 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR); |
157bfc25 MN |
1754 | goto error; |
1755 | } | |
1756 | ||
1da177e4 LT |
1757 | dst->next = policy->bundles; |
1758 | policy->bundles = dst; | |
1759 | dst_hold(dst); | |
1760 | write_unlock_bh(&policy->lock); | |
1761 | } | |
1762 | *dst_p = dst; | |
1763 | dst_release(dst_orig); | |
a716c119 | 1764 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1765 | return 0; |
1766 | ||
1767 | error: | |
4e81bb83 | 1768 | xfrm_pols_put(pols, npols); |
75b8c133 HX |
1769 | dropdst: |
1770 | dst_release(dst_orig); | |
1da177e4 LT |
1771 | *dst_p = NULL; |
1772 | return err; | |
8b7817f3 HX |
1773 | |
1774 | nopol: | |
aef21785 | 1775 | err = -ENOENT; |
8b7817f3 HX |
1776 | if (flags & XFRM_LOOKUP_ICMP) |
1777 | goto dropdst; | |
1778 | return 0; | |
1da177e4 | 1779 | } |
14e50e57 DM |
1780 | EXPORT_SYMBOL(__xfrm_lookup); |
1781 | ||
52479b62 | 1782 | int xfrm_lookup(struct net *net, struct dst_entry **dst_p, struct flowi *fl, |
14e50e57 DM |
1783 | struct sock *sk, int flags) |
1784 | { | |
52479b62 | 1785 | int err = __xfrm_lookup(net, dst_p, fl, sk, flags); |
14e50e57 DM |
1786 | |
1787 | if (err == -EREMOTE) { | |
1788 | dst_release(*dst_p); | |
1789 | *dst_p = NULL; | |
1790 | err = -EAGAIN; | |
1791 | } | |
1792 | ||
1793 | return err; | |
1794 | } | |
1da177e4 LT |
1795 | EXPORT_SYMBOL(xfrm_lookup); |
1796 | ||
df0ba92a MN |
1797 | static inline int |
1798 | xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl) | |
1799 | { | |
1800 | struct xfrm_state *x; | |
df0ba92a MN |
1801 | |
1802 | if (!skb->sp || idx < 0 || idx >= skb->sp->len) | |
1803 | return 0; | |
1804 | x = skb->sp->xvec[idx]; | |
1805 | if (!x->type->reject) | |
1806 | return 0; | |
1ecafede | 1807 | return x->type->reject(x, skb, fl); |
df0ba92a MN |
1808 | } |
1809 | ||
1da177e4 LT |
1810 | /* When skb is transformed back to its "native" form, we have to |
1811 | * check policy restrictions. At the moment we make this in maximally | |
1812 | * stupid way. Shame on me. :-) Of course, connected sockets must | |
1813 | * have policy cached at them. | |
1814 | */ | |
1815 | ||
1816 | static inline int | |
a716c119 | 1817 | xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x, |
1da177e4 LT |
1818 | unsigned short family) |
1819 | { | |
1820 | if (xfrm_state_kern(x)) | |
928ba416 | 1821 | return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family); |
1da177e4 LT |
1822 | return x->id.proto == tmpl->id.proto && |
1823 | (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && | |
1824 | (x->props.reqid == tmpl->reqid || !tmpl->reqid) && | |
1825 | x->props.mode == tmpl->mode && | |
c5d18e98 | 1826 | (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) || |
f3bd4840 | 1827 | !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) && |
7e49e6de MN |
1828 | !(x->props.mode != XFRM_MODE_TRANSPORT && |
1829 | xfrm_state_addr_cmp(tmpl, x, family)); | |
1da177e4 LT |
1830 | } |
1831 | ||
df0ba92a MN |
1832 | /* |
1833 | * 0 or more than 0 is returned when validation is succeeded (either bypass | |
1834 | * because of optional transport mode, or next index of the mathced secpath | |
1835 | * state with the template. | |
1836 | * -1 is returned when no matching template is found. | |
1837 | * Otherwise "-2 - errored_index" is returned. | |
1838 | */ | |
1da177e4 LT |
1839 | static inline int |
1840 | xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start, | |
1841 | unsigned short family) | |
1842 | { | |
1843 | int idx = start; | |
1844 | ||
1845 | if (tmpl->optional) { | |
7e49e6de | 1846 | if (tmpl->mode == XFRM_MODE_TRANSPORT) |
1da177e4 LT |
1847 | return start; |
1848 | } else | |
1849 | start = -1; | |
1850 | for (; idx < sp->len; idx++) { | |
dbe5b4aa | 1851 | if (xfrm_state_ok(tmpl, sp->xvec[idx], family)) |
1da177e4 | 1852 | return ++idx; |
df0ba92a MN |
1853 | if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) { |
1854 | if (start == -1) | |
1855 | start = -2-idx; | |
1da177e4 | 1856 | break; |
df0ba92a | 1857 | } |
1da177e4 LT |
1858 | } |
1859 | return start; | |
1860 | } | |
1861 | ||
d5422efe HX |
1862 | int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, |
1863 | unsigned int family, int reverse) | |
1da177e4 LT |
1864 | { |
1865 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
e0d1caa7 | 1866 | int err; |
1da177e4 LT |
1867 | |
1868 | if (unlikely(afinfo == NULL)) | |
1869 | return -EAFNOSUPPORT; | |
1870 | ||
d5422efe | 1871 | afinfo->decode_session(skb, fl, reverse); |
beb8d13b | 1872 | err = security_xfrm_decode_session(skb, &fl->secid); |
1da177e4 | 1873 | xfrm_policy_put_afinfo(afinfo); |
e0d1caa7 | 1874 | return err; |
1da177e4 | 1875 | } |
d5422efe | 1876 | EXPORT_SYMBOL(__xfrm_decode_session); |
1da177e4 | 1877 | |
df0ba92a | 1878 | static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp) |
1da177e4 LT |
1879 | { |
1880 | for (; k < sp->len; k++) { | |
df0ba92a | 1881 | if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) { |
d1d9facf | 1882 | *idxp = k; |
1da177e4 | 1883 | return 1; |
df0ba92a | 1884 | } |
1da177e4 LT |
1885 | } |
1886 | ||
1887 | return 0; | |
1888 | } | |
1889 | ||
a716c119 | 1890 | int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, |
1da177e4 LT |
1891 | unsigned short family) |
1892 | { | |
f6e1e25d | 1893 | struct net *net = dev_net(skb->dev); |
1da177e4 | 1894 | struct xfrm_policy *pol; |
4e81bb83 MN |
1895 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
1896 | int npols = 0; | |
1897 | int xfrm_nr; | |
1898 | int pi; | |
d5422efe | 1899 | int reverse; |
1da177e4 | 1900 | struct flowi fl; |
d5422efe | 1901 | u8 fl_dir; |
df0ba92a | 1902 | int xerr_idx = -1; |
1da177e4 | 1903 | |
d5422efe HX |
1904 | reverse = dir & ~XFRM_POLICY_MASK; |
1905 | dir &= XFRM_POLICY_MASK; | |
1906 | fl_dir = policy_to_flow_dir(dir); | |
1907 | ||
0aa64774 | 1908 | if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) { |
59c9940e | 1909 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); |
1da177e4 | 1910 | return 0; |
0aa64774 MN |
1911 | } |
1912 | ||
eb9c7ebe | 1913 | nf_nat_decode_session(skb, &fl, family); |
1da177e4 LT |
1914 | |
1915 | /* First, check used SA against their selectors. */ | |
1916 | if (skb->sp) { | |
1917 | int i; | |
1918 | ||
1919 | for (i=skb->sp->len-1; i>=0; i--) { | |
dbe5b4aa | 1920 | struct xfrm_state *x = skb->sp->xvec[i]; |
0aa64774 | 1921 | if (!xfrm_selector_match(&x->sel, &fl, family)) { |
59c9940e | 1922 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH); |
1da177e4 | 1923 | return 0; |
0aa64774 | 1924 | } |
1da177e4 LT |
1925 | } |
1926 | } | |
1927 | ||
1928 | pol = NULL; | |
3bccfbc7 | 1929 | if (sk && sk->sk_policy[dir]) { |
e0d1caa7 | 1930 | pol = xfrm_sk_policy_lookup(sk, dir, &fl); |
0aa64774 | 1931 | if (IS_ERR(pol)) { |
59c9940e | 1932 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
3bccfbc7 | 1933 | return 0; |
0aa64774 | 1934 | } |
3bccfbc7 | 1935 | } |
1da177e4 LT |
1936 | |
1937 | if (!pol) | |
f6e1e25d | 1938 | pol = flow_cache_lookup(net, &fl, family, fl_dir, |
1da177e4 LT |
1939 | xfrm_policy_lookup); |
1940 | ||
0aa64774 | 1941 | if (IS_ERR(pol)) { |
59c9940e | 1942 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
134b0fc5 | 1943 | return 0; |
0aa64774 | 1944 | } |
134b0fc5 | 1945 | |
df0ba92a | 1946 | if (!pol) { |
d1d9facf | 1947 | if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) { |
df0ba92a | 1948 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
59c9940e | 1949 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS); |
df0ba92a MN |
1950 | return 0; |
1951 | } | |
1952 | return 1; | |
1953 | } | |
1da177e4 | 1954 | |
9d729f72 | 1955 | pol->curlft.use_time = get_seconds(); |
1da177e4 | 1956 | |
4e81bb83 MN |
1957 | pols[0] = pol; |
1958 | npols ++; | |
1959 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1960 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
f6e1e25d | 1961 | pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, |
4e81bb83 MN |
1962 | &fl, family, |
1963 | XFRM_POLICY_IN); | |
1964 | if (pols[1]) { | |
0aa64774 | 1965 | if (IS_ERR(pols[1])) { |
59c9940e | 1966 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
134b0fc5 | 1967 | return 0; |
0aa64774 | 1968 | } |
9d729f72 | 1969 | pols[1]->curlft.use_time = get_seconds(); |
4e81bb83 MN |
1970 | npols ++; |
1971 | } | |
1972 | } | |
1973 | #endif | |
1974 | ||
1da177e4 LT |
1975 | if (pol->action == XFRM_POLICY_ALLOW) { |
1976 | struct sec_path *sp; | |
1977 | static struct sec_path dummy; | |
4e81bb83 | 1978 | struct xfrm_tmpl *tp[XFRM_MAX_DEPTH]; |
41a49cc3 | 1979 | struct xfrm_tmpl *stp[XFRM_MAX_DEPTH]; |
4e81bb83 MN |
1980 | struct xfrm_tmpl **tpp = tp; |
1981 | int ti = 0; | |
1da177e4 LT |
1982 | int i, k; |
1983 | ||
1984 | if ((sp = skb->sp) == NULL) | |
1985 | sp = &dummy; | |
1986 | ||
4e81bb83 MN |
1987 | for (pi = 0; pi < npols; pi++) { |
1988 | if (pols[pi] != pol && | |
0aa64774 | 1989 | pols[pi]->action != XFRM_POLICY_ALLOW) { |
59c9940e | 1990 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); |
4e81bb83 | 1991 | goto reject; |
0aa64774 MN |
1992 | } |
1993 | if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
59c9940e | 1994 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); |
4e81bb83 | 1995 | goto reject_error; |
0aa64774 | 1996 | } |
4e81bb83 MN |
1997 | for (i = 0; i < pols[pi]->xfrm_nr; i++) |
1998 | tpp[ti++] = &pols[pi]->xfrm_vec[i]; | |
1999 | } | |
2000 | xfrm_nr = ti; | |
41a49cc3 MN |
2001 | if (npols > 1) { |
2002 | xfrm_tmpl_sort(stp, tpp, xfrm_nr, family); | |
2003 | tpp = stp; | |
2004 | } | |
4e81bb83 | 2005 | |
1da177e4 LT |
2006 | /* For each tunnel xfrm, find the first matching tmpl. |
2007 | * For each tmpl before that, find corresponding xfrm. | |
2008 | * Order is _important_. Later we will implement | |
2009 | * some barriers, but at the moment barriers | |
2010 | * are implied between each two transformations. | |
2011 | */ | |
4e81bb83 MN |
2012 | for (i = xfrm_nr-1, k = 0; i >= 0; i--) { |
2013 | k = xfrm_policy_ok(tpp[i], sp, k, family); | |
df0ba92a | 2014 | if (k < 0) { |
d1d9facf JM |
2015 | if (k < -1) |
2016 | /* "-2 - errored_index" returned */ | |
2017 | xerr_idx = -(2+k); | |
59c9940e | 2018 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 2019 | goto reject; |
df0ba92a | 2020 | } |
1da177e4 LT |
2021 | } |
2022 | ||
0aa64774 | 2023 | if (secpath_has_nontransport(sp, k, &xerr_idx)) { |
59c9940e | 2024 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 2025 | goto reject; |
0aa64774 | 2026 | } |
1da177e4 | 2027 | |
4e81bb83 | 2028 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
2029 | return 1; |
2030 | } | |
59c9940e | 2031 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); |
1da177e4 LT |
2032 | |
2033 | reject: | |
df0ba92a | 2034 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
4e81bb83 MN |
2035 | reject_error: |
2036 | xfrm_pols_put(pols, npols); | |
1da177e4 LT |
2037 | return 0; |
2038 | } | |
2039 | EXPORT_SYMBOL(__xfrm_policy_check); | |
2040 | ||
2041 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
2042 | { | |
99a66657 | 2043 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
2044 | struct flowi fl; |
2045 | ||
0aa64774 MN |
2046 | if (xfrm_decode_session(skb, &fl, family) < 0) { |
2047 | /* XXX: we should have something like FWDHDRERROR here. */ | |
59c9940e | 2048 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); |
1da177e4 | 2049 | return 0; |
0aa64774 | 2050 | } |
1da177e4 | 2051 | |
99a66657 | 2052 | return xfrm_lookup(net, &skb->dst, &fl, NULL, 0) == 0; |
1da177e4 LT |
2053 | } |
2054 | EXPORT_SYMBOL(__xfrm_route_forward); | |
2055 | ||
d49c73c7 DM |
2056 | /* Optimize later using cookies and generation ids. */ |
2057 | ||
1da177e4 LT |
2058 | static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) |
2059 | { | |
d49c73c7 DM |
2060 | /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete |
2061 | * to "-1" to force all XFRM destinations to get validated by | |
2062 | * dst_ops->check on every use. We do this because when a | |
2063 | * normal route referenced by an XFRM dst is obsoleted we do | |
2064 | * not go looking around for all parent referencing XFRM dsts | |
2065 | * so that we can invalidate them. It is just too much work. | |
2066 | * Instead we make the checks here on every use. For example: | |
2067 | * | |
2068 | * XFRM dst A --> IPv4 dst X | |
2069 | * | |
2070 | * X is the "xdst->route" of A (X is also the "dst->path" of A | |
2071 | * in this example). If X is marked obsolete, "A" will not | |
2072 | * notice. That's what we are validating here via the | |
2073 | * stale_bundle() check. | |
2074 | * | |
2075 | * When a policy's bundle is pruned, we dst_free() the XFRM | |
2076 | * dst which causes it's ->obsolete field to be set to a | |
2077 | * positive non-zero integer. If an XFRM dst has been pruned | |
2078 | * like this, we want to force a new route lookup. | |
399c180a | 2079 | */ |
d49c73c7 DM |
2080 | if (dst->obsolete < 0 && !stale_bundle(dst)) |
2081 | return dst; | |
2082 | ||
1da177e4 LT |
2083 | return NULL; |
2084 | } | |
2085 | ||
2086 | static int stale_bundle(struct dst_entry *dst) | |
2087 | { | |
5b368e61 | 2088 | return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0); |
1da177e4 LT |
2089 | } |
2090 | ||
aabc9761 | 2091 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
1da177e4 | 2092 | { |
1da177e4 | 2093 | while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { |
c346dca1 | 2094 | dst->dev = dev_net(dev)->loopback_dev; |
de3cb747 | 2095 | dev_hold(dst->dev); |
1da177e4 LT |
2096 | dev_put(dev); |
2097 | } | |
2098 | } | |
aabc9761 | 2099 | EXPORT_SYMBOL(xfrm_dst_ifdown); |
1da177e4 LT |
2100 | |
2101 | static void xfrm_link_failure(struct sk_buff *skb) | |
2102 | { | |
2103 | /* Impossible. Such dst must be popped before reaches point of failure. */ | |
2104 | return; | |
2105 | } | |
2106 | ||
2107 | static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) | |
2108 | { | |
2109 | if (dst) { | |
2110 | if (dst->obsolete) { | |
2111 | dst_release(dst); | |
2112 | dst = NULL; | |
2113 | } | |
2114 | } | |
2115 | return dst; | |
2116 | } | |
2117 | ||
2518c7c2 DM |
2118 | static void prune_one_bundle(struct xfrm_policy *pol, int (*func)(struct dst_entry *), struct dst_entry **gc_list_p) |
2119 | { | |
2120 | struct dst_entry *dst, **dstp; | |
2121 | ||
2122 | write_lock(&pol->lock); | |
2123 | dstp = &pol->bundles; | |
2124 | while ((dst=*dstp) != NULL) { | |
2125 | if (func(dst)) { | |
2126 | *dstp = dst->next; | |
2127 | dst->next = *gc_list_p; | |
2128 | *gc_list_p = dst; | |
2129 | } else { | |
2130 | dstp = &dst->next; | |
2131 | } | |
2132 | } | |
2133 | write_unlock(&pol->lock); | |
2134 | } | |
2135 | ||
3dd0b499 | 2136 | static void xfrm_prune_bundles(struct net *net, int (*func)(struct dst_entry *)) |
1da177e4 | 2137 | { |
2518c7c2 DM |
2138 | struct dst_entry *gc_list = NULL; |
2139 | int dir; | |
1da177e4 LT |
2140 | |
2141 | read_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
2142 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
2143 | struct xfrm_policy *pol; | |
2144 | struct hlist_node *entry; | |
2145 | struct hlist_head *table; | |
2146 | int i; | |
4e81bb83 | 2147 | |
2518c7c2 | 2148 | hlist_for_each_entry(pol, entry, |
3dd0b499 | 2149 | &net->xfrm.policy_inexact[dir], bydst) |
2518c7c2 DM |
2150 | prune_one_bundle(pol, func, &gc_list); |
2151 | ||
3dd0b499 AD |
2152 | table = net->xfrm.policy_bydst[dir].table; |
2153 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { | |
2518c7c2 DM |
2154 | hlist_for_each_entry(pol, entry, table + i, bydst) |
2155 | prune_one_bundle(pol, func, &gc_list); | |
1da177e4 LT |
2156 | } |
2157 | } | |
2158 | read_unlock_bh(&xfrm_policy_lock); | |
2159 | ||
2160 | while (gc_list) { | |
2518c7c2 | 2161 | struct dst_entry *dst = gc_list; |
1da177e4 LT |
2162 | gc_list = dst->next; |
2163 | dst_free(dst); | |
2164 | } | |
2165 | } | |
2166 | ||
2167 | static int unused_bundle(struct dst_entry *dst) | |
2168 | { | |
2169 | return !atomic_read(&dst->__refcnt); | |
2170 | } | |
2171 | ||
ddcfd796 | 2172 | static void __xfrm_garbage_collect(struct net *net) |
1da177e4 | 2173 | { |
ddcfd796 | 2174 | xfrm_prune_bundles(net, unused_bundle); |
1da177e4 LT |
2175 | } |
2176 | ||
3dd0b499 | 2177 | static int xfrm_flush_bundles(struct net *net) |
1da177e4 | 2178 | { |
3dd0b499 | 2179 | xfrm_prune_bundles(net, stale_bundle); |
1da177e4 LT |
2180 | return 0; |
2181 | } | |
2182 | ||
25ee3286 | 2183 | static void xfrm_init_pmtu(struct dst_entry *dst) |
1da177e4 LT |
2184 | { |
2185 | do { | |
2186 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2187 | u32 pmtu, route_mtu_cached; | |
2188 | ||
2189 | pmtu = dst_mtu(dst->child); | |
2190 | xdst->child_mtu_cached = pmtu; | |
2191 | ||
2192 | pmtu = xfrm_state_mtu(dst->xfrm, pmtu); | |
2193 | ||
2194 | route_mtu_cached = dst_mtu(xdst->route); | |
2195 | xdst->route_mtu_cached = route_mtu_cached; | |
2196 | ||
2197 | if (pmtu > route_mtu_cached) | |
2198 | pmtu = route_mtu_cached; | |
2199 | ||
2200 | dst->metrics[RTAX_MTU-1] = pmtu; | |
2201 | } while ((dst = dst->next)); | |
2202 | } | |
2203 | ||
1da177e4 LT |
2204 | /* Check that the bundle accepts the flow and its components are |
2205 | * still valid. | |
2206 | */ | |
2207 | ||
5b368e61 VY |
2208 | int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first, |
2209 | struct flowi *fl, int family, int strict) | |
1da177e4 LT |
2210 | { |
2211 | struct dst_entry *dst = &first->u.dst; | |
2212 | struct xfrm_dst *last; | |
2213 | u32 mtu; | |
2214 | ||
92d63dec | 2215 | if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || |
1da177e4 LT |
2216 | (dst->dev && !netif_running(dst->dev))) |
2217 | return 0; | |
157bfc25 MN |
2218 | #ifdef CONFIG_XFRM_SUB_POLICY |
2219 | if (fl) { | |
2220 | if (first->origin && !flow_cache_uli_match(first->origin, fl)) | |
2221 | return 0; | |
2222 | if (first->partner && | |
2223 | !xfrm_selector_match(first->partner, fl, family)) | |
2224 | return 0; | |
2225 | } | |
2226 | #endif | |
1da177e4 LT |
2227 | |
2228 | last = NULL; | |
2229 | ||
2230 | do { | |
2231 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2232 | ||
2233 | if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family)) | |
2234 | return 0; | |
67f83cbf VY |
2235 | if (fl && pol && |
2236 | !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl)) | |
e0d1caa7 | 2237 | return 0; |
1da177e4 LT |
2238 | if (dst->xfrm->km.state != XFRM_STATE_VALID) |
2239 | return 0; | |
9d4a706d DM |
2240 | if (xdst->genid != dst->xfrm->genid) |
2241 | return 0; | |
e53820de | 2242 | |
1bfcb10f | 2243 | if (strict && fl && |
13996378 | 2244 | !(dst->xfrm->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) && |
e53820de MN |
2245 | !xfrm_state_addr_flow_check(dst->xfrm, fl, family)) |
2246 | return 0; | |
1da177e4 LT |
2247 | |
2248 | mtu = dst_mtu(dst->child); | |
2249 | if (xdst->child_mtu_cached != mtu) { | |
2250 | last = xdst; | |
2251 | xdst->child_mtu_cached = mtu; | |
2252 | } | |
2253 | ||
92d63dec | 2254 | if (!dst_check(xdst->route, xdst->route_cookie)) |
1da177e4 LT |
2255 | return 0; |
2256 | mtu = dst_mtu(xdst->route); | |
2257 | if (xdst->route_mtu_cached != mtu) { | |
2258 | last = xdst; | |
2259 | xdst->route_mtu_cached = mtu; | |
2260 | } | |
2261 | ||
2262 | dst = dst->child; | |
2263 | } while (dst->xfrm); | |
2264 | ||
2265 | if (likely(!last)) | |
2266 | return 1; | |
2267 | ||
2268 | mtu = last->child_mtu_cached; | |
2269 | for (;;) { | |
2270 | dst = &last->u.dst; | |
2271 | ||
2272 | mtu = xfrm_state_mtu(dst->xfrm, mtu); | |
2273 | if (mtu > last->route_mtu_cached) | |
2274 | mtu = last->route_mtu_cached; | |
2275 | dst->metrics[RTAX_MTU-1] = mtu; | |
2276 | ||
2277 | if (last == first) | |
2278 | break; | |
2279 | ||
bd0bf076 | 2280 | last = (struct xfrm_dst *)last->u.dst.next; |
1da177e4 LT |
2281 | last->child_mtu_cached = mtu; |
2282 | } | |
2283 | ||
2284 | return 1; | |
2285 | } | |
2286 | ||
2287 | EXPORT_SYMBOL(xfrm_bundle_ok); | |
2288 | ||
1da177e4 LT |
2289 | int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) |
2290 | { | |
2291 | int err = 0; | |
2292 | if (unlikely(afinfo == NULL)) | |
2293 | return -EINVAL; | |
2294 | if (unlikely(afinfo->family >= NPROTO)) | |
2295 | return -EAFNOSUPPORT; | |
e959d812 | 2296 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2297 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) |
2298 | err = -ENOBUFS; | |
2299 | else { | |
2300 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2301 | if (likely(dst_ops->kmem_cachep == NULL)) | |
2302 | dst_ops->kmem_cachep = xfrm_dst_cache; | |
2303 | if (likely(dst_ops->check == NULL)) | |
2304 | dst_ops->check = xfrm_dst_check; | |
1da177e4 LT |
2305 | if (likely(dst_ops->negative_advice == NULL)) |
2306 | dst_ops->negative_advice = xfrm_negative_advice; | |
2307 | if (likely(dst_ops->link_failure == NULL)) | |
2308 | dst_ops->link_failure = xfrm_link_failure; | |
1da177e4 LT |
2309 | if (likely(afinfo->garbage_collect == NULL)) |
2310 | afinfo->garbage_collect = __xfrm_garbage_collect; | |
2311 | xfrm_policy_afinfo[afinfo->family] = afinfo; | |
2312 | } | |
e959d812 | 2313 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2314 | return err; |
2315 | } | |
2316 | EXPORT_SYMBOL(xfrm_policy_register_afinfo); | |
2317 | ||
2318 | int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2319 | { | |
2320 | int err = 0; | |
2321 | if (unlikely(afinfo == NULL)) | |
2322 | return -EINVAL; | |
2323 | if (unlikely(afinfo->family >= NPROTO)) | |
2324 | return -EAFNOSUPPORT; | |
e959d812 | 2325 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2326 | if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { |
2327 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) | |
2328 | err = -EINVAL; | |
2329 | else { | |
2330 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2331 | xfrm_policy_afinfo[afinfo->family] = NULL; | |
2332 | dst_ops->kmem_cachep = NULL; | |
2333 | dst_ops->check = NULL; | |
1da177e4 LT |
2334 | dst_ops->negative_advice = NULL; |
2335 | dst_ops->link_failure = NULL; | |
1da177e4 LT |
2336 | afinfo->garbage_collect = NULL; |
2337 | } | |
2338 | } | |
e959d812 | 2339 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2340 | return err; |
2341 | } | |
2342 | EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); | |
2343 | ||
2344 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) | |
2345 | { | |
2346 | struct xfrm_policy_afinfo *afinfo; | |
2347 | if (unlikely(family >= NPROTO)) | |
2348 | return NULL; | |
2349 | read_lock(&xfrm_policy_afinfo_lock); | |
2350 | afinfo = xfrm_policy_afinfo[family]; | |
546be240 HX |
2351 | if (unlikely(!afinfo)) |
2352 | read_unlock(&xfrm_policy_afinfo_lock); | |
1da177e4 LT |
2353 | return afinfo; |
2354 | } | |
2355 | ||
2356 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2357 | { | |
546be240 HX |
2358 | read_unlock(&xfrm_policy_afinfo_lock); |
2359 | } | |
2360 | ||
1da177e4 LT |
2361 | static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) |
2362 | { | |
e9dc8653 EB |
2363 | struct net_device *dev = ptr; |
2364 | ||
1da177e4 LT |
2365 | switch (event) { |
2366 | case NETDEV_DOWN: | |
3dd0b499 | 2367 | xfrm_flush_bundles(dev_net(dev)); |
1da177e4 LT |
2368 | } |
2369 | return NOTIFY_DONE; | |
2370 | } | |
2371 | ||
2372 | static struct notifier_block xfrm_dev_notifier = { | |
d5917a35 | 2373 | .notifier_call = xfrm_dev_event, |
1da177e4 LT |
2374 | }; |
2375 | ||
558f82ef | 2376 | #ifdef CONFIG_XFRM_STATISTICS |
59c9940e | 2377 | static int __net_init xfrm_statistics_init(struct net *net) |
558f82ef | 2378 | { |
c68cd1a0 AD |
2379 | int rv; |
2380 | ||
59c9940e | 2381 | if (snmp_mib_init((void **)net->mib.xfrm_statistics, |
558f82ef MN |
2382 | sizeof(struct linux_xfrm_mib)) < 0) |
2383 | return -ENOMEM; | |
c68cd1a0 AD |
2384 | rv = xfrm_proc_init(net); |
2385 | if (rv < 0) | |
2386 | snmp_mib_free((void **)net->mib.xfrm_statistics); | |
2387 | return rv; | |
558f82ef | 2388 | } |
59c9940e AD |
2389 | |
2390 | static void xfrm_statistics_fini(struct net *net) | |
2391 | { | |
c68cd1a0 | 2392 | xfrm_proc_fini(net); |
59c9940e AD |
2393 | snmp_mib_free((void **)net->mib.xfrm_statistics); |
2394 | } | |
2395 | #else | |
2396 | static int __net_init xfrm_statistics_init(struct net *net) | |
2397 | { | |
2398 | return 0; | |
2399 | } | |
2400 | ||
2401 | static void xfrm_statistics_fini(struct net *net) | |
2402 | { | |
2403 | } | |
558f82ef MN |
2404 | #endif |
2405 | ||
d62ddc21 | 2406 | static int __net_init xfrm_policy_init(struct net *net) |
1da177e4 | 2407 | { |
2518c7c2 DM |
2408 | unsigned int hmask, sz; |
2409 | int dir; | |
2410 | ||
d62ddc21 AD |
2411 | if (net_eq(net, &init_net)) |
2412 | xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", | |
1da177e4 | 2413 | sizeof(struct xfrm_dst), |
e5d679f3 | 2414 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
20c2df83 | 2415 | NULL); |
1da177e4 | 2416 | |
2518c7c2 DM |
2417 | hmask = 8 - 1; |
2418 | sz = (hmask+1) * sizeof(struct hlist_head); | |
2419 | ||
93b851c1 AD |
2420 | net->xfrm.policy_byidx = xfrm_hash_alloc(sz); |
2421 | if (!net->xfrm.policy_byidx) | |
2422 | goto out_byidx; | |
8100bea7 | 2423 | net->xfrm.policy_idx_hmask = hmask; |
2518c7c2 DM |
2424 | |
2425 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
2426 | struct xfrm_policy_hash *htab; | |
2427 | ||
dc2caba7 | 2428 | net->xfrm.policy_count[dir] = 0; |
8b18f8ea | 2429 | INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]); |
2518c7c2 | 2430 | |
a35f6c5d | 2431 | htab = &net->xfrm.policy_bydst[dir]; |
44e36b42 | 2432 | htab->table = xfrm_hash_alloc(sz); |
2518c7c2 | 2433 | if (!htab->table) |
a35f6c5d AD |
2434 | goto out_bydst; |
2435 | htab->hmask = hmask; | |
2518c7c2 DM |
2436 | } |
2437 | ||
adfcf0b2 | 2438 | INIT_LIST_HEAD(&net->xfrm.policy_all); |
66caf628 | 2439 | INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize); |
d62ddc21 AD |
2440 | if (net_eq(net, &init_net)) |
2441 | register_netdevice_notifier(&xfrm_dev_notifier); | |
2442 | return 0; | |
93b851c1 | 2443 | |
a35f6c5d AD |
2444 | out_bydst: |
2445 | for (dir--; dir >= 0; dir--) { | |
2446 | struct xfrm_policy_hash *htab; | |
2447 | ||
2448 | htab = &net->xfrm.policy_bydst[dir]; | |
2449 | xfrm_hash_free(htab->table, sz); | |
2450 | } | |
2451 | xfrm_hash_free(net->xfrm.policy_byidx, sz); | |
93b851c1 AD |
2452 | out_byidx: |
2453 | return -ENOMEM; | |
d62ddc21 AD |
2454 | } |
2455 | ||
2456 | static void xfrm_policy_fini(struct net *net) | |
2457 | { | |
7c2776ee | 2458 | struct xfrm_audit audit_info; |
93b851c1 | 2459 | unsigned int sz; |
8b18f8ea | 2460 | int dir; |
93b851c1 | 2461 | |
7c2776ee AD |
2462 | flush_work(&net->xfrm.policy_hash_work); |
2463 | #ifdef CONFIG_XFRM_SUB_POLICY | |
2464 | audit_info.loginuid = -1; | |
2465 | audit_info.sessionid = -1; | |
2466 | audit_info.secid = 0; | |
2467 | xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, &audit_info); | |
2468 | #endif | |
2469 | audit_info.loginuid = -1; | |
2470 | audit_info.sessionid = -1; | |
2471 | audit_info.secid = 0; | |
2472 | xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info); | |
2473 | flush_work(&xfrm_policy_gc_work); | |
2474 | ||
adfcf0b2 | 2475 | WARN_ON(!list_empty(&net->xfrm.policy_all)); |
93b851c1 | 2476 | |
8b18f8ea | 2477 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
a35f6c5d AD |
2478 | struct xfrm_policy_hash *htab; |
2479 | ||
8b18f8ea | 2480 | WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir])); |
a35f6c5d AD |
2481 | |
2482 | htab = &net->xfrm.policy_bydst[dir]; | |
2483 | sz = (htab->hmask + 1); | |
2484 | WARN_ON(!hlist_empty(htab->table)); | |
2485 | xfrm_hash_free(htab->table, sz); | |
8b18f8ea AD |
2486 | } |
2487 | ||
8100bea7 | 2488 | sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head); |
93b851c1 AD |
2489 | WARN_ON(!hlist_empty(net->xfrm.policy_byidx)); |
2490 | xfrm_hash_free(net->xfrm.policy_byidx, sz); | |
1da177e4 LT |
2491 | } |
2492 | ||
d62ddc21 AD |
2493 | static int __net_init xfrm_net_init(struct net *net) |
2494 | { | |
2495 | int rv; | |
2496 | ||
59c9940e AD |
2497 | rv = xfrm_statistics_init(net); |
2498 | if (rv < 0) | |
2499 | goto out_statistics; | |
d62ddc21 AD |
2500 | rv = xfrm_state_init(net); |
2501 | if (rv < 0) | |
2502 | goto out_state; | |
2503 | rv = xfrm_policy_init(net); | |
2504 | if (rv < 0) | |
2505 | goto out_policy; | |
b27aeadb AD |
2506 | rv = xfrm_sysctl_init(net); |
2507 | if (rv < 0) | |
2508 | goto out_sysctl; | |
d62ddc21 AD |
2509 | return 0; |
2510 | ||
b27aeadb AD |
2511 | out_sysctl: |
2512 | xfrm_policy_fini(net); | |
d62ddc21 AD |
2513 | out_policy: |
2514 | xfrm_state_fini(net); | |
2515 | out_state: | |
59c9940e AD |
2516 | xfrm_statistics_fini(net); |
2517 | out_statistics: | |
d62ddc21 AD |
2518 | return rv; |
2519 | } | |
2520 | ||
2521 | static void __net_exit xfrm_net_exit(struct net *net) | |
2522 | { | |
b27aeadb | 2523 | xfrm_sysctl_fini(net); |
d62ddc21 AD |
2524 | xfrm_policy_fini(net); |
2525 | xfrm_state_fini(net); | |
59c9940e | 2526 | xfrm_statistics_fini(net); |
d62ddc21 AD |
2527 | } |
2528 | ||
2529 | static struct pernet_operations __net_initdata xfrm_net_ops = { | |
2530 | .init = xfrm_net_init, | |
2531 | .exit = xfrm_net_exit, | |
2532 | }; | |
2533 | ||
1da177e4 LT |
2534 | void __init xfrm_init(void) |
2535 | { | |
d62ddc21 | 2536 | register_pernet_subsys(&xfrm_net_ops); |
1da177e4 LT |
2537 | xfrm_input_init(); |
2538 | } | |
2539 | ||
ab5f5e8b | 2540 | #ifdef CONFIG_AUDITSYSCALL |
1486cbd7 IJ |
2541 | static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp, |
2542 | struct audit_buffer *audit_buf) | |
ab5f5e8b | 2543 | { |
875179fa PM |
2544 | struct xfrm_sec_ctx *ctx = xp->security; |
2545 | struct xfrm_selector *sel = &xp->selector; | |
2546 | ||
2547 | if (ctx) | |
ab5f5e8b | 2548 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", |
875179fa | 2549 | ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); |
ab5f5e8b | 2550 | |
875179fa | 2551 | switch(sel->family) { |
ab5f5e8b | 2552 | case AF_INET: |
21454aaa | 2553 | audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4); |
875179fa PM |
2554 | if (sel->prefixlen_s != 32) |
2555 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2556 | sel->prefixlen_s); | |
21454aaa | 2557 | audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4); |
875179fa PM |
2558 | if (sel->prefixlen_d != 32) |
2559 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2560 | sel->prefixlen_d); | |
ab5f5e8b JL |
2561 | break; |
2562 | case AF_INET6: | |
5b095d98 | 2563 | audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6); |
875179fa PM |
2564 | if (sel->prefixlen_s != 128) |
2565 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2566 | sel->prefixlen_s); | |
5b095d98 | 2567 | audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6); |
875179fa PM |
2568 | if (sel->prefixlen_d != 128) |
2569 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2570 | sel->prefixlen_d); | |
ab5f5e8b JL |
2571 | break; |
2572 | } | |
2573 | } | |
2574 | ||
68277acc | 2575 | void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, |
2532386f | 2576 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2577 | { |
2578 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2579 | |
afeb14b4 | 2580 | audit_buf = xfrm_audit_start("SPD-add"); |
ab5f5e8b JL |
2581 | if (audit_buf == NULL) |
2582 | return; | |
2532386f | 2583 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 | 2584 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
2585 | xfrm_audit_common_policyinfo(xp, audit_buf); |
2586 | audit_log_end(audit_buf); | |
2587 | } | |
2588 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_add); | |
2589 | ||
68277acc | 2590 | void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, |
2532386f | 2591 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2592 | { |
2593 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2594 | |
afeb14b4 | 2595 | audit_buf = xfrm_audit_start("SPD-delete"); |
ab5f5e8b JL |
2596 | if (audit_buf == NULL) |
2597 | return; | |
2532386f | 2598 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 | 2599 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
2600 | xfrm_audit_common_policyinfo(xp, audit_buf); |
2601 | audit_log_end(audit_buf); | |
2602 | } | |
2603 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete); | |
2604 | #endif | |
2605 | ||
80c9abaa SS |
2606 | #ifdef CONFIG_XFRM_MIGRATE |
2607 | static int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp, | |
2608 | struct xfrm_selector *sel_tgt) | |
2609 | { | |
2610 | if (sel_cmp->proto == IPSEC_ULPROTO_ANY) { | |
2611 | if (sel_tgt->family == sel_cmp->family && | |
2612 | xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr, | |
a716c119 | 2613 | sel_cmp->family) == 0 && |
80c9abaa SS |
2614 | xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr, |
2615 | sel_cmp->family) == 0 && | |
2616 | sel_tgt->prefixlen_d == sel_cmp->prefixlen_d && | |
2617 | sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) { | |
2618 | return 1; | |
2619 | } | |
2620 | } else { | |
2621 | if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) { | |
2622 | return 1; | |
2623 | } | |
2624 | } | |
2625 | return 0; | |
2626 | } | |
2627 | ||
2628 | static struct xfrm_policy * xfrm_migrate_policy_find(struct xfrm_selector *sel, | |
2629 | u8 dir, u8 type) | |
2630 | { | |
2631 | struct xfrm_policy *pol, *ret = NULL; | |
2632 | struct hlist_node *entry; | |
2633 | struct hlist_head *chain; | |
2634 | u32 priority = ~0U; | |
2635 | ||
2636 | read_lock_bh(&xfrm_policy_lock); | |
1121994c | 2637 | chain = policy_hash_direct(&init_net, &sel->daddr, &sel->saddr, sel->family, dir); |
80c9abaa SS |
2638 | hlist_for_each_entry(pol, entry, chain, bydst) { |
2639 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2640 | pol->type == type) { | |
2641 | ret = pol; | |
2642 | priority = ret->priority; | |
2643 | break; | |
2644 | } | |
2645 | } | |
8b18f8ea | 2646 | chain = &init_net.xfrm.policy_inexact[dir]; |
80c9abaa SS |
2647 | hlist_for_each_entry(pol, entry, chain, bydst) { |
2648 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2649 | pol->type == type && | |
2650 | pol->priority < priority) { | |
2651 | ret = pol; | |
2652 | break; | |
2653 | } | |
2654 | } | |
2655 | ||
2656 | if (ret) | |
2657 | xfrm_pol_hold(ret); | |
2658 | ||
2659 | read_unlock_bh(&xfrm_policy_lock); | |
2660 | ||
2661 | return ret; | |
2662 | } | |
2663 | ||
2664 | static int migrate_tmpl_match(struct xfrm_migrate *m, struct xfrm_tmpl *t) | |
2665 | { | |
2666 | int match = 0; | |
2667 | ||
2668 | if (t->mode == m->mode && t->id.proto == m->proto && | |
2669 | (m->reqid == 0 || t->reqid == m->reqid)) { | |
2670 | switch (t->mode) { | |
2671 | case XFRM_MODE_TUNNEL: | |
2672 | case XFRM_MODE_BEET: | |
2673 | if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr, | |
2674 | m->old_family) == 0 && | |
2675 | xfrm_addr_cmp(&t->saddr, &m->old_saddr, | |
2676 | m->old_family) == 0) { | |
2677 | match = 1; | |
2678 | } | |
2679 | break; | |
2680 | case XFRM_MODE_TRANSPORT: | |
2681 | /* in case of transport mode, template does not store | |
2682 | any IP addresses, hence we just compare mode and | |
2683 | protocol */ | |
2684 | match = 1; | |
2685 | break; | |
2686 | default: | |
2687 | break; | |
2688 | } | |
2689 | } | |
2690 | return match; | |
2691 | } | |
2692 | ||
2693 | /* update endpoint address(es) of template(s) */ | |
2694 | static int xfrm_policy_migrate(struct xfrm_policy *pol, | |
2695 | struct xfrm_migrate *m, int num_migrate) | |
2696 | { | |
2697 | struct xfrm_migrate *mp; | |
2698 | struct dst_entry *dst; | |
2699 | int i, j, n = 0; | |
2700 | ||
2701 | write_lock_bh(&pol->lock); | |
12a169e7 | 2702 | if (unlikely(pol->walk.dead)) { |
80c9abaa SS |
2703 | /* target policy has been deleted */ |
2704 | write_unlock_bh(&pol->lock); | |
2705 | return -ENOENT; | |
2706 | } | |
2707 | ||
2708 | for (i = 0; i < pol->xfrm_nr; i++) { | |
2709 | for (j = 0, mp = m; j < num_migrate; j++, mp++) { | |
2710 | if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i])) | |
2711 | continue; | |
2712 | n++; | |
1bfcb10f HX |
2713 | if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL && |
2714 | pol->xfrm_vec[i].mode != XFRM_MODE_BEET) | |
80c9abaa SS |
2715 | continue; |
2716 | /* update endpoints */ | |
2717 | memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr, | |
2718 | sizeof(pol->xfrm_vec[i].id.daddr)); | |
2719 | memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr, | |
2720 | sizeof(pol->xfrm_vec[i].saddr)); | |
2721 | pol->xfrm_vec[i].encap_family = mp->new_family; | |
2722 | /* flush bundles */ | |
2723 | while ((dst = pol->bundles) != NULL) { | |
2724 | pol->bundles = dst->next; | |
2725 | dst_free(dst); | |
2726 | } | |
2727 | } | |
2728 | } | |
2729 | ||
2730 | write_unlock_bh(&pol->lock); | |
2731 | ||
2732 | if (!n) | |
2733 | return -ENODATA; | |
2734 | ||
2735 | return 0; | |
2736 | } | |
2737 | ||
2738 | static int xfrm_migrate_check(struct xfrm_migrate *m, int num_migrate) | |
2739 | { | |
2740 | int i, j; | |
2741 | ||
2742 | if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) | |
2743 | return -EINVAL; | |
2744 | ||
2745 | for (i = 0; i < num_migrate; i++) { | |
2746 | if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr, | |
2747 | m[i].old_family) == 0) && | |
2748 | (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr, | |
2749 | m[i].old_family) == 0)) | |
2750 | return -EINVAL; | |
2751 | if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) || | |
2752 | xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) | |
2753 | return -EINVAL; | |
2754 | ||
2755 | /* check if there is any duplicated entry */ | |
2756 | for (j = i + 1; j < num_migrate; j++) { | |
2757 | if (!memcmp(&m[i].old_daddr, &m[j].old_daddr, | |
2758 | sizeof(m[i].old_daddr)) && | |
2759 | !memcmp(&m[i].old_saddr, &m[j].old_saddr, | |
2760 | sizeof(m[i].old_saddr)) && | |
2761 | m[i].proto == m[j].proto && | |
2762 | m[i].mode == m[j].mode && | |
2763 | m[i].reqid == m[j].reqid && | |
2764 | m[i].old_family == m[j].old_family) | |
2765 | return -EINVAL; | |
2766 | } | |
2767 | } | |
2768 | ||
2769 | return 0; | |
2770 | } | |
2771 | ||
2772 | int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type, | |
13c1d189 AE |
2773 | struct xfrm_migrate *m, int num_migrate, |
2774 | struct xfrm_kmaddress *k) | |
80c9abaa SS |
2775 | { |
2776 | int i, err, nx_cur = 0, nx_new = 0; | |
2777 | struct xfrm_policy *pol = NULL; | |
2778 | struct xfrm_state *x, *xc; | |
2779 | struct xfrm_state *x_cur[XFRM_MAX_DEPTH]; | |
2780 | struct xfrm_state *x_new[XFRM_MAX_DEPTH]; | |
2781 | struct xfrm_migrate *mp; | |
2782 | ||
2783 | if ((err = xfrm_migrate_check(m, num_migrate)) < 0) | |
2784 | goto out; | |
2785 | ||
2786 | /* Stage 1 - find policy */ | |
2787 | if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) { | |
2788 | err = -ENOENT; | |
2789 | goto out; | |
2790 | } | |
2791 | ||
2792 | /* Stage 2 - find and update state(s) */ | |
2793 | for (i = 0, mp = m; i < num_migrate; i++, mp++) { | |
2794 | if ((x = xfrm_migrate_state_find(mp))) { | |
2795 | x_cur[nx_cur] = x; | |
2796 | nx_cur++; | |
2797 | if ((xc = xfrm_state_migrate(x, mp))) { | |
2798 | x_new[nx_new] = xc; | |
2799 | nx_new++; | |
2800 | } else { | |
2801 | err = -ENODATA; | |
2802 | goto restore_state; | |
2803 | } | |
2804 | } | |
2805 | } | |
2806 | ||
2807 | /* Stage 3 - update policy */ | |
2808 | if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0) | |
2809 | goto restore_state; | |
2810 | ||
2811 | /* Stage 4 - delete old state(s) */ | |
2812 | if (nx_cur) { | |
2813 | xfrm_states_put(x_cur, nx_cur); | |
2814 | xfrm_states_delete(x_cur, nx_cur); | |
2815 | } | |
2816 | ||
2817 | /* Stage 5 - announce */ | |
13c1d189 | 2818 | km_migrate(sel, dir, type, m, num_migrate, k); |
80c9abaa SS |
2819 | |
2820 | xfrm_pol_put(pol); | |
2821 | ||
2822 | return 0; | |
2823 | out: | |
2824 | return err; | |
2825 | ||
2826 | restore_state: | |
2827 | if (pol) | |
2828 | xfrm_pol_put(pol); | |
2829 | if (nx_cur) | |
2830 | xfrm_states_put(x_cur, nx_cur); | |
2831 | if (nx_new) | |
2832 | xfrm_states_delete(x_new, nx_new); | |
2833 | ||
2834 | return err; | |
2835 | } | |
e610e679 | 2836 | EXPORT_SYMBOL(xfrm_migrate); |
80c9abaa | 2837 | #endif |