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Commit | Line | Data |
---|---|---|
a716c119 | 1 | /* |
1da177e4 LT |
2 | * xfrm_policy.c |
3 | * | |
4 | * Changes: | |
5 | * Mitsuru KANDA @USAGI | |
6 | * Kazunori MIYAZAWA @USAGI | |
7 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> | |
8 | * IPv6 support | |
9 | * Kazunori MIYAZAWA @USAGI | |
10 | * YOSHIFUJI Hideaki | |
11 | * Split up af-specific portion | |
12 | * Derek Atkins <derek@ihtfp.com> Add the post_input processor | |
df71837d | 13 | * |
1da177e4 LT |
14 | */ |
15 | ||
66cdb3ca | 16 | #include <linux/err.h> |
1da177e4 LT |
17 | #include <linux/slab.h> |
18 | #include <linux/kmod.h> | |
19 | #include <linux/list.h> | |
20 | #include <linux/spinlock.h> | |
21 | #include <linux/workqueue.h> | |
22 | #include <linux/notifier.h> | |
23 | #include <linux/netdevice.h> | |
eb9c7ebe | 24 | #include <linux/netfilter.h> |
1da177e4 | 25 | #include <linux/module.h> |
2518c7c2 | 26 | #include <linux/cache.h> |
68277acc | 27 | #include <linux/audit.h> |
25ee3286 | 28 | #include <net/dst.h> |
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 | ||
28faa979 | 37 | int sysctl_xfrm_larval_drop __read_mostly = 1; |
14e50e57 | 38 | |
558f82ef MN |
39 | #ifdef CONFIG_XFRM_STATISTICS |
40 | DEFINE_SNMP_STAT(struct linux_xfrm_mib, xfrm_statistics) __read_mostly; | |
41 | EXPORT_SYMBOL(xfrm_statistics); | |
42 | #endif | |
43 | ||
4a3e2f71 AV |
44 | DEFINE_MUTEX(xfrm_cfg_mutex); |
45 | EXPORT_SYMBOL(xfrm_cfg_mutex); | |
1da177e4 LT |
46 | |
47 | static DEFINE_RWLOCK(xfrm_policy_lock); | |
48 | ||
4c563f76 | 49 | static struct list_head xfrm_policy_bytype[XFRM_POLICY_TYPE_MAX]; |
2518c7c2 DM |
50 | unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2]; |
51 | EXPORT_SYMBOL(xfrm_policy_count); | |
1da177e4 LT |
52 | |
53 | static DEFINE_RWLOCK(xfrm_policy_afinfo_lock); | |
54 | static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO]; | |
55 | ||
e18b890b | 56 | static struct kmem_cache *xfrm_dst_cache __read_mostly; |
1da177e4 LT |
57 | |
58 | static struct work_struct xfrm_policy_gc_work; | |
2518c7c2 | 59 | static HLIST_HEAD(xfrm_policy_gc_list); |
1da177e4 LT |
60 | static DEFINE_SPINLOCK(xfrm_policy_gc_lock); |
61 | ||
62 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family); | |
63 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo); | |
25ee3286 | 64 | static void xfrm_init_pmtu(struct dst_entry *dst); |
1da177e4 | 65 | |
77681021 AM |
66 | static inline int |
67 | __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl) | |
68 | { | |
69 | return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) && | |
70 | addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) && | |
71 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && | |
72 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && | |
73 | (fl->proto == sel->proto || !sel->proto) && | |
74 | (fl->oif == sel->ifindex || !sel->ifindex); | |
75 | } | |
76 | ||
77 | static inline int | |
78 | __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl) | |
79 | { | |
80 | return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) && | |
81 | addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) && | |
82 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && | |
83 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && | |
84 | (fl->proto == sel->proto || !sel->proto) && | |
85 | (fl->oif == sel->ifindex || !sel->ifindex); | |
86 | } | |
87 | ||
88 | int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, | |
89 | unsigned short family) | |
90 | { | |
91 | switch (family) { | |
92 | case AF_INET: | |
93 | return __xfrm4_selector_match(sel, fl); | |
94 | case AF_INET6: | |
95 | return __xfrm6_selector_match(sel, fl); | |
96 | } | |
97 | return 0; | |
98 | } | |
99 | ||
9bb182a7 YH |
100 | static inline struct dst_entry *__xfrm_dst_lookup(int tos, |
101 | xfrm_address_t *saddr, | |
102 | xfrm_address_t *daddr, | |
103 | int family) | |
104 | { | |
105 | struct xfrm_policy_afinfo *afinfo; | |
106 | struct dst_entry *dst; | |
107 | ||
108 | afinfo = xfrm_policy_get_afinfo(family); | |
109 | if (unlikely(afinfo == NULL)) | |
110 | return ERR_PTR(-EAFNOSUPPORT); | |
111 | ||
112 | dst = afinfo->dst_lookup(tos, saddr, daddr); | |
113 | ||
114 | xfrm_policy_put_afinfo(afinfo); | |
115 | ||
116 | return dst; | |
117 | } | |
118 | ||
25ee3286 | 119 | static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos, |
9bb182a7 YH |
120 | xfrm_address_t *prev_saddr, |
121 | xfrm_address_t *prev_daddr, | |
25ee3286 | 122 | int family) |
1da177e4 | 123 | { |
66cdb3ca HX |
124 | xfrm_address_t *saddr = &x->props.saddr; |
125 | xfrm_address_t *daddr = &x->id.daddr; | |
66cdb3ca HX |
126 | struct dst_entry *dst; |
127 | ||
9bb182a7 | 128 | if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) { |
66cdb3ca | 129 | saddr = x->coaddr; |
9bb182a7 YH |
130 | daddr = prev_daddr; |
131 | } | |
132 | if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) { | |
133 | saddr = prev_saddr; | |
66cdb3ca | 134 | daddr = x->coaddr; |
9bb182a7 | 135 | } |
1da177e4 | 136 | |
9bb182a7 YH |
137 | dst = __xfrm_dst_lookup(tos, saddr, daddr, family); |
138 | ||
139 | if (!IS_ERR(dst)) { | |
140 | if (prev_saddr != saddr) | |
141 | memcpy(prev_saddr, saddr, sizeof(*prev_saddr)); | |
142 | if (prev_daddr != daddr) | |
143 | memcpy(prev_daddr, daddr, sizeof(*prev_daddr)); | |
144 | } | |
1da177e4 | 145 | |
66cdb3ca | 146 | return dst; |
1da177e4 | 147 | } |
1da177e4 | 148 | |
1da177e4 LT |
149 | static inline unsigned long make_jiffies(long secs) |
150 | { | |
151 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
152 | return MAX_SCHEDULE_TIMEOUT-1; | |
153 | else | |
a716c119 | 154 | return secs*HZ; |
1da177e4 LT |
155 | } |
156 | ||
157 | static void xfrm_policy_timer(unsigned long data) | |
158 | { | |
159 | struct xfrm_policy *xp = (struct xfrm_policy*)data; | |
9d729f72 | 160 | unsigned long now = get_seconds(); |
1da177e4 LT |
161 | long next = LONG_MAX; |
162 | int warn = 0; | |
163 | int dir; | |
164 | ||
165 | read_lock(&xp->lock); | |
166 | ||
167 | if (xp->dead) | |
168 | goto out; | |
169 | ||
77d8d7a6 | 170 | dir = xfrm_policy_id2dir(xp->index); |
1da177e4 LT |
171 | |
172 | if (xp->lft.hard_add_expires_seconds) { | |
173 | long tmo = xp->lft.hard_add_expires_seconds + | |
174 | xp->curlft.add_time - now; | |
175 | if (tmo <= 0) | |
176 | goto expired; | |
177 | if (tmo < next) | |
178 | next = tmo; | |
179 | } | |
180 | if (xp->lft.hard_use_expires_seconds) { | |
181 | long tmo = xp->lft.hard_use_expires_seconds + | |
182 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
183 | if (tmo <= 0) | |
184 | goto expired; | |
185 | if (tmo < next) | |
186 | next = tmo; | |
187 | } | |
188 | if (xp->lft.soft_add_expires_seconds) { | |
189 | long tmo = xp->lft.soft_add_expires_seconds + | |
190 | xp->curlft.add_time - now; | |
191 | if (tmo <= 0) { | |
192 | warn = 1; | |
193 | tmo = XFRM_KM_TIMEOUT; | |
194 | } | |
195 | if (tmo < next) | |
196 | next = tmo; | |
197 | } | |
198 | if (xp->lft.soft_use_expires_seconds) { | |
199 | long tmo = xp->lft.soft_use_expires_seconds + | |
200 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
201 | if (tmo <= 0) { | |
202 | warn = 1; | |
203 | tmo = XFRM_KM_TIMEOUT; | |
204 | } | |
205 | if (tmo < next) | |
206 | next = tmo; | |
207 | } | |
208 | ||
209 | if (warn) | |
6c5c8ca7 | 210 | km_policy_expired(xp, dir, 0, 0); |
1da177e4 LT |
211 | if (next != LONG_MAX && |
212 | !mod_timer(&xp->timer, jiffies + make_jiffies(next))) | |
213 | xfrm_pol_hold(xp); | |
214 | ||
215 | out: | |
216 | read_unlock(&xp->lock); | |
217 | xfrm_pol_put(xp); | |
218 | return; | |
219 | ||
220 | expired: | |
221 | read_unlock(&xp->lock); | |
4666faab | 222 | if (!xfrm_policy_delete(xp, dir)) |
6c5c8ca7 | 223 | km_policy_expired(xp, dir, 1, 0); |
1da177e4 LT |
224 | xfrm_pol_put(xp); |
225 | } | |
226 | ||
227 | ||
228 | /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2 | |
229 | * SPD calls. | |
230 | */ | |
231 | ||
dd0fc66f | 232 | struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp) |
1da177e4 LT |
233 | { |
234 | struct xfrm_policy *policy; | |
235 | ||
0da974f4 | 236 | policy = kzalloc(sizeof(struct xfrm_policy), gfp); |
1da177e4 LT |
237 | |
238 | if (policy) { | |
4c563f76 | 239 | INIT_LIST_HEAD(&policy->bytype); |
2518c7c2 DM |
240 | INIT_HLIST_NODE(&policy->bydst); |
241 | INIT_HLIST_NODE(&policy->byidx); | |
1da177e4 | 242 | rwlock_init(&policy->lock); |
2518c7c2 | 243 | atomic_set(&policy->refcnt, 1); |
b24b8a24 PE |
244 | setup_timer(&policy->timer, xfrm_policy_timer, |
245 | (unsigned long)policy); | |
1da177e4 LT |
246 | } |
247 | return policy; | |
248 | } | |
249 | EXPORT_SYMBOL(xfrm_policy_alloc); | |
250 | ||
251 | /* Destroy xfrm_policy: descendant resources must be released to this moment. */ | |
252 | ||
64c31b3f | 253 | void xfrm_policy_destroy(struct xfrm_policy *policy) |
1da177e4 | 254 | { |
09a62660 | 255 | BUG_ON(!policy->dead); |
1da177e4 | 256 | |
09a62660 | 257 | BUG_ON(policy->bundles); |
1da177e4 LT |
258 | |
259 | if (del_timer(&policy->timer)) | |
260 | BUG(); | |
261 | ||
4c563f76 TT |
262 | write_lock_bh(&xfrm_policy_lock); |
263 | list_del(&policy->bytype); | |
264 | write_unlock_bh(&xfrm_policy_lock); | |
265 | ||
03e1ad7b | 266 | security_xfrm_policy_free(policy->security); |
1da177e4 LT |
267 | kfree(policy); |
268 | } | |
64c31b3f | 269 | EXPORT_SYMBOL(xfrm_policy_destroy); |
1da177e4 LT |
270 | |
271 | static void xfrm_policy_gc_kill(struct xfrm_policy *policy) | |
272 | { | |
273 | struct dst_entry *dst; | |
274 | ||
275 | while ((dst = policy->bundles) != NULL) { | |
276 | policy->bundles = dst->next; | |
277 | dst_free(dst); | |
278 | } | |
279 | ||
280 | if (del_timer(&policy->timer)) | |
281 | atomic_dec(&policy->refcnt); | |
282 | ||
283 | if (atomic_read(&policy->refcnt) > 1) | |
284 | flow_cache_flush(); | |
285 | ||
286 | xfrm_pol_put(policy); | |
287 | } | |
288 | ||
c4028958 | 289 | static void xfrm_policy_gc_task(struct work_struct *work) |
1da177e4 LT |
290 | { |
291 | struct xfrm_policy *policy; | |
2518c7c2 DM |
292 | struct hlist_node *entry, *tmp; |
293 | struct hlist_head gc_list; | |
1da177e4 LT |
294 | |
295 | spin_lock_bh(&xfrm_policy_gc_lock); | |
2518c7c2 DM |
296 | gc_list.first = xfrm_policy_gc_list.first; |
297 | INIT_HLIST_HEAD(&xfrm_policy_gc_list); | |
1da177e4 LT |
298 | spin_unlock_bh(&xfrm_policy_gc_lock); |
299 | ||
2518c7c2 | 300 | hlist_for_each_entry_safe(policy, entry, tmp, &gc_list, bydst) |
1da177e4 | 301 | xfrm_policy_gc_kill(policy); |
1da177e4 LT |
302 | } |
303 | ||
304 | /* Rule must be locked. Release descentant resources, announce | |
305 | * entry dead. The rule must be unlinked from lists to the moment. | |
306 | */ | |
307 | ||
308 | static void xfrm_policy_kill(struct xfrm_policy *policy) | |
309 | { | |
310 | int dead; | |
311 | ||
312 | write_lock_bh(&policy->lock); | |
313 | dead = policy->dead; | |
314 | policy->dead = 1; | |
315 | write_unlock_bh(&policy->lock); | |
316 | ||
317 | if (unlikely(dead)) { | |
318 | WARN_ON(1); | |
319 | return; | |
320 | } | |
321 | ||
322 | spin_lock(&xfrm_policy_gc_lock); | |
2518c7c2 | 323 | hlist_add_head(&policy->bydst, &xfrm_policy_gc_list); |
1da177e4 LT |
324 | spin_unlock(&xfrm_policy_gc_lock); |
325 | ||
326 | schedule_work(&xfrm_policy_gc_work); | |
327 | } | |
328 | ||
2518c7c2 DM |
329 | struct xfrm_policy_hash { |
330 | struct hlist_head *table; | |
331 | unsigned int hmask; | |
332 | }; | |
333 | ||
334 | static struct hlist_head xfrm_policy_inexact[XFRM_POLICY_MAX*2]; | |
335 | static struct xfrm_policy_hash xfrm_policy_bydst[XFRM_POLICY_MAX*2] __read_mostly; | |
336 | static struct hlist_head *xfrm_policy_byidx __read_mostly; | |
337 | static unsigned int xfrm_idx_hmask __read_mostly; | |
338 | static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024; | |
339 | ||
2518c7c2 DM |
340 | static inline unsigned int idx_hash(u32 index) |
341 | { | |
342 | return __idx_hash(index, xfrm_idx_hmask); | |
343 | } | |
344 | ||
2518c7c2 DM |
345 | static struct hlist_head *policy_hash_bysel(struct xfrm_selector *sel, unsigned short family, int dir) |
346 | { | |
347 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
348 | unsigned int hash = __sel_hash(sel, family, hmask); | |
349 | ||
350 | return (hash == hmask + 1 ? | |
351 | &xfrm_policy_inexact[dir] : | |
352 | xfrm_policy_bydst[dir].table + hash); | |
353 | } | |
354 | ||
355 | static struct hlist_head *policy_hash_direct(xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir) | |
356 | { | |
357 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
358 | unsigned int hash = __addr_hash(daddr, saddr, family, hmask); | |
359 | ||
360 | return xfrm_policy_bydst[dir].table + hash; | |
361 | } | |
362 | ||
2518c7c2 DM |
363 | static void xfrm_dst_hash_transfer(struct hlist_head *list, |
364 | struct hlist_head *ndsttable, | |
365 | unsigned int nhashmask) | |
366 | { | |
b791160b | 367 | struct hlist_node *entry, *tmp, *entry0 = NULL; |
2518c7c2 | 368 | struct xfrm_policy *pol; |
b791160b | 369 | unsigned int h0 = 0; |
2518c7c2 | 370 | |
b791160b | 371 | redo: |
2518c7c2 DM |
372 | hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) { |
373 | unsigned int h; | |
374 | ||
375 | h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr, | |
376 | pol->family, nhashmask); | |
b791160b YH |
377 | if (!entry0) { |
378 | hlist_del(entry); | |
379 | hlist_add_head(&pol->bydst, ndsttable+h); | |
380 | h0 = h; | |
381 | } else { | |
382 | if (h != h0) | |
383 | continue; | |
384 | hlist_del(entry); | |
385 | hlist_add_after(entry0, &pol->bydst); | |
386 | } | |
387 | entry0 = entry; | |
388 | } | |
389 | if (!hlist_empty(list)) { | |
390 | entry0 = NULL; | |
391 | goto redo; | |
2518c7c2 DM |
392 | } |
393 | } | |
394 | ||
395 | static void xfrm_idx_hash_transfer(struct hlist_head *list, | |
396 | struct hlist_head *nidxtable, | |
397 | unsigned int nhashmask) | |
398 | { | |
399 | struct hlist_node *entry, *tmp; | |
400 | struct xfrm_policy *pol; | |
401 | ||
402 | hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) { | |
403 | unsigned int h; | |
404 | ||
405 | h = __idx_hash(pol->index, nhashmask); | |
406 | hlist_add_head(&pol->byidx, nidxtable+h); | |
407 | } | |
408 | } | |
409 | ||
410 | static unsigned long xfrm_new_hash_mask(unsigned int old_hmask) | |
411 | { | |
412 | return ((old_hmask + 1) << 1) - 1; | |
413 | } | |
414 | ||
415 | static void xfrm_bydst_resize(int dir) | |
416 | { | |
417 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
418 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); | |
419 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
420 | struct hlist_head *odst = xfrm_policy_bydst[dir].table; | |
44e36b42 | 421 | struct hlist_head *ndst = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
422 | int i; |
423 | ||
424 | if (!ndst) | |
425 | return; | |
426 | ||
427 | write_lock_bh(&xfrm_policy_lock); | |
428 | ||
429 | for (i = hmask; i >= 0; i--) | |
430 | xfrm_dst_hash_transfer(odst + i, ndst, nhashmask); | |
431 | ||
432 | xfrm_policy_bydst[dir].table = ndst; | |
433 | xfrm_policy_bydst[dir].hmask = nhashmask; | |
434 | ||
435 | write_unlock_bh(&xfrm_policy_lock); | |
436 | ||
44e36b42 | 437 | xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
438 | } |
439 | ||
440 | static void xfrm_byidx_resize(int total) | |
441 | { | |
442 | unsigned int hmask = xfrm_idx_hmask; | |
443 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); | |
444 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
445 | struct hlist_head *oidx = xfrm_policy_byidx; | |
44e36b42 | 446 | struct hlist_head *nidx = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
447 | int i; |
448 | ||
449 | if (!nidx) | |
450 | return; | |
451 | ||
452 | write_lock_bh(&xfrm_policy_lock); | |
453 | ||
454 | for (i = hmask; i >= 0; i--) | |
455 | xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask); | |
456 | ||
457 | xfrm_policy_byidx = nidx; | |
458 | xfrm_idx_hmask = nhashmask; | |
459 | ||
460 | write_unlock_bh(&xfrm_policy_lock); | |
461 | ||
44e36b42 | 462 | xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
463 | } |
464 | ||
465 | static inline int xfrm_bydst_should_resize(int dir, int *total) | |
466 | { | |
467 | unsigned int cnt = xfrm_policy_count[dir]; | |
468 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
469 | ||
470 | if (total) | |
471 | *total += cnt; | |
472 | ||
473 | if ((hmask + 1) < xfrm_policy_hashmax && | |
474 | cnt > hmask) | |
475 | return 1; | |
476 | ||
477 | return 0; | |
478 | } | |
479 | ||
480 | static inline int xfrm_byidx_should_resize(int total) | |
481 | { | |
482 | unsigned int hmask = xfrm_idx_hmask; | |
483 | ||
484 | if ((hmask + 1) < xfrm_policy_hashmax && | |
485 | total > hmask) | |
486 | return 1; | |
487 | ||
488 | return 0; | |
489 | } | |
490 | ||
5a6d3416 | 491 | void xfrm_spd_getinfo(struct xfrmk_spdinfo *si) |
ecfd6b18 JHS |
492 | { |
493 | read_lock_bh(&xfrm_policy_lock); | |
494 | si->incnt = xfrm_policy_count[XFRM_POLICY_IN]; | |
495 | si->outcnt = xfrm_policy_count[XFRM_POLICY_OUT]; | |
496 | si->fwdcnt = xfrm_policy_count[XFRM_POLICY_FWD]; | |
497 | si->inscnt = xfrm_policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX]; | |
498 | si->outscnt = xfrm_policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX]; | |
499 | si->fwdscnt = xfrm_policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX]; | |
500 | si->spdhcnt = xfrm_idx_hmask; | |
501 | si->spdhmcnt = xfrm_policy_hashmax; | |
502 | read_unlock_bh(&xfrm_policy_lock); | |
503 | } | |
504 | EXPORT_SYMBOL(xfrm_spd_getinfo); | |
2518c7c2 | 505 | |
ecfd6b18 | 506 | static DEFINE_MUTEX(hash_resize_mutex); |
c4028958 | 507 | static void xfrm_hash_resize(struct work_struct *__unused) |
2518c7c2 DM |
508 | { |
509 | int dir, total; | |
510 | ||
511 | mutex_lock(&hash_resize_mutex); | |
512 | ||
513 | total = 0; | |
514 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
515 | if (xfrm_bydst_should_resize(dir, &total)) | |
516 | xfrm_bydst_resize(dir); | |
517 | } | |
518 | if (xfrm_byidx_should_resize(total)) | |
519 | xfrm_byidx_resize(total); | |
520 | ||
521 | mutex_unlock(&hash_resize_mutex); | |
522 | } | |
523 | ||
c4028958 | 524 | static DECLARE_WORK(xfrm_hash_work, xfrm_hash_resize); |
2518c7c2 | 525 | |
1da177e4 LT |
526 | /* Generate new index... KAME seems to generate them ordered by cost |
527 | * of an absolute inpredictability of ordering of rules. This will not pass. */ | |
4e81bb83 | 528 | static u32 xfrm_gen_index(u8 type, int dir) |
1da177e4 | 529 | { |
1da177e4 LT |
530 | static u32 idx_generator; |
531 | ||
532 | for (;;) { | |
2518c7c2 DM |
533 | struct hlist_node *entry; |
534 | struct hlist_head *list; | |
535 | struct xfrm_policy *p; | |
536 | u32 idx; | |
537 | int found; | |
538 | ||
1da177e4 LT |
539 | idx = (idx_generator | dir); |
540 | idx_generator += 8; | |
541 | if (idx == 0) | |
542 | idx = 8; | |
2518c7c2 DM |
543 | list = xfrm_policy_byidx + idx_hash(idx); |
544 | found = 0; | |
545 | hlist_for_each_entry(p, entry, list, byidx) { | |
546 | if (p->index == idx) { | |
547 | found = 1; | |
1da177e4 | 548 | break; |
2518c7c2 | 549 | } |
1da177e4 | 550 | } |
2518c7c2 | 551 | if (!found) |
1da177e4 LT |
552 | return idx; |
553 | } | |
554 | } | |
555 | ||
2518c7c2 DM |
556 | static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2) |
557 | { | |
558 | u32 *p1 = (u32 *) s1; | |
559 | u32 *p2 = (u32 *) s2; | |
560 | int len = sizeof(struct xfrm_selector) / sizeof(u32); | |
561 | int i; | |
562 | ||
563 | for (i = 0; i < len; i++) { | |
564 | if (p1[i] != p2[i]) | |
565 | return 1; | |
566 | } | |
567 | ||
568 | return 0; | |
569 | } | |
570 | ||
1da177e4 LT |
571 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) |
572 | { | |
2518c7c2 DM |
573 | struct xfrm_policy *pol; |
574 | struct xfrm_policy *delpol; | |
575 | struct hlist_head *chain; | |
a6c7ab55 | 576 | struct hlist_node *entry, *newpos; |
9b78a82c | 577 | struct dst_entry *gc_list; |
1da177e4 LT |
578 | |
579 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
580 | chain = policy_hash_bysel(&policy->selector, policy->family, dir); |
581 | delpol = NULL; | |
582 | newpos = NULL; | |
2518c7c2 | 583 | hlist_for_each_entry(pol, entry, chain, bydst) { |
a6c7ab55 | 584 | if (pol->type == policy->type && |
2518c7c2 | 585 | !selector_cmp(&pol->selector, &policy->selector) && |
a6c7ab55 HX |
586 | xfrm_sec_ctx_match(pol->security, policy->security) && |
587 | !WARN_ON(delpol)) { | |
1da177e4 LT |
588 | if (excl) { |
589 | write_unlock_bh(&xfrm_policy_lock); | |
590 | return -EEXIST; | |
591 | } | |
1da177e4 LT |
592 | delpol = pol; |
593 | if (policy->priority > pol->priority) | |
594 | continue; | |
595 | } else if (policy->priority >= pol->priority) { | |
a6c7ab55 | 596 | newpos = &pol->bydst; |
1da177e4 LT |
597 | continue; |
598 | } | |
1da177e4 LT |
599 | if (delpol) |
600 | break; | |
1da177e4 LT |
601 | } |
602 | if (newpos) | |
2518c7c2 DM |
603 | hlist_add_after(newpos, &policy->bydst); |
604 | else | |
605 | hlist_add_head(&policy->bydst, chain); | |
1da177e4 | 606 | xfrm_pol_hold(policy); |
2518c7c2 | 607 | xfrm_policy_count[dir]++; |
1da177e4 | 608 | atomic_inc(&flow_cache_genid); |
2518c7c2 DM |
609 | if (delpol) { |
610 | hlist_del(&delpol->bydst); | |
611 | hlist_del(&delpol->byidx); | |
612 | xfrm_policy_count[dir]--; | |
613 | } | |
4e81bb83 | 614 | policy->index = delpol ? delpol->index : xfrm_gen_index(policy->type, dir); |
2518c7c2 | 615 | hlist_add_head(&policy->byidx, xfrm_policy_byidx+idx_hash(policy->index)); |
9d729f72 | 616 | policy->curlft.add_time = get_seconds(); |
1da177e4 LT |
617 | policy->curlft.use_time = 0; |
618 | if (!mod_timer(&policy->timer, jiffies + HZ)) | |
619 | xfrm_pol_hold(policy); | |
4c563f76 | 620 | list_add_tail(&policy->bytype, &xfrm_policy_bytype[policy->type]); |
1da177e4 LT |
621 | write_unlock_bh(&xfrm_policy_lock); |
622 | ||
9b78a82c | 623 | if (delpol) |
1da177e4 | 624 | xfrm_policy_kill(delpol); |
2518c7c2 DM |
625 | else if (xfrm_bydst_should_resize(dir, NULL)) |
626 | schedule_work(&xfrm_hash_work); | |
9b78a82c DM |
627 | |
628 | read_lock_bh(&xfrm_policy_lock); | |
629 | gc_list = NULL; | |
2518c7c2 DM |
630 | entry = &policy->bydst; |
631 | hlist_for_each_entry_continue(policy, entry, bydst) { | |
9b78a82c DM |
632 | struct dst_entry *dst; |
633 | ||
634 | write_lock(&policy->lock); | |
635 | dst = policy->bundles; | |
636 | if (dst) { | |
637 | struct dst_entry *tail = dst; | |
638 | while (tail->next) | |
639 | tail = tail->next; | |
640 | tail->next = gc_list; | |
641 | gc_list = dst; | |
642 | ||
643 | policy->bundles = NULL; | |
644 | } | |
645 | write_unlock(&policy->lock); | |
1da177e4 | 646 | } |
9b78a82c DM |
647 | read_unlock_bh(&xfrm_policy_lock); |
648 | ||
649 | while (gc_list) { | |
650 | struct dst_entry *dst = gc_list; | |
651 | ||
652 | gc_list = dst->next; | |
653 | dst_free(dst); | |
654 | } | |
655 | ||
1da177e4 LT |
656 | return 0; |
657 | } | |
658 | EXPORT_SYMBOL(xfrm_policy_insert); | |
659 | ||
4e81bb83 MN |
660 | struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir, |
661 | struct xfrm_selector *sel, | |
ef41aaa0 EP |
662 | struct xfrm_sec_ctx *ctx, int delete, |
663 | int *err) | |
1da177e4 | 664 | { |
2518c7c2 DM |
665 | struct xfrm_policy *pol, *ret; |
666 | struct hlist_head *chain; | |
667 | struct hlist_node *entry; | |
1da177e4 | 668 | |
ef41aaa0 | 669 | *err = 0; |
1da177e4 | 670 | write_lock_bh(&xfrm_policy_lock); |
2518c7c2 DM |
671 | chain = policy_hash_bysel(sel, sel->family, dir); |
672 | ret = NULL; | |
673 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
674 | if (pol->type == type && | |
675 | !selector_cmp(sel, &pol->selector) && | |
676 | xfrm_sec_ctx_match(ctx, pol->security)) { | |
1da177e4 | 677 | xfrm_pol_hold(pol); |
2518c7c2 | 678 | if (delete) { |
03e1ad7b PM |
679 | *err = security_xfrm_policy_delete( |
680 | pol->security); | |
ef41aaa0 EP |
681 | if (*err) { |
682 | write_unlock_bh(&xfrm_policy_lock); | |
683 | return pol; | |
684 | } | |
2518c7c2 DM |
685 | hlist_del(&pol->bydst); |
686 | hlist_del(&pol->byidx); | |
687 | xfrm_policy_count[dir]--; | |
688 | } | |
689 | ret = pol; | |
1da177e4 LT |
690 | break; |
691 | } | |
692 | } | |
693 | write_unlock_bh(&xfrm_policy_lock); | |
694 | ||
2518c7c2 | 695 | if (ret && delete) { |
1da177e4 | 696 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 697 | xfrm_policy_kill(ret); |
1da177e4 | 698 | } |
2518c7c2 | 699 | return ret; |
1da177e4 | 700 | } |
df71837d | 701 | EXPORT_SYMBOL(xfrm_policy_bysel_ctx); |
1da177e4 | 702 | |
ef41aaa0 EP |
703 | struct xfrm_policy *xfrm_policy_byid(u8 type, int dir, u32 id, int delete, |
704 | int *err) | |
1da177e4 | 705 | { |
2518c7c2 DM |
706 | struct xfrm_policy *pol, *ret; |
707 | struct hlist_head *chain; | |
708 | struct hlist_node *entry; | |
1da177e4 | 709 | |
b5505c6e HX |
710 | *err = -ENOENT; |
711 | if (xfrm_policy_id2dir(id) != dir) | |
712 | return NULL; | |
713 | ||
ef41aaa0 | 714 | *err = 0; |
1da177e4 | 715 | write_lock_bh(&xfrm_policy_lock); |
2518c7c2 DM |
716 | chain = xfrm_policy_byidx + idx_hash(id); |
717 | ret = NULL; | |
718 | hlist_for_each_entry(pol, entry, chain, byidx) { | |
719 | if (pol->type == type && pol->index == id) { | |
1da177e4 | 720 | xfrm_pol_hold(pol); |
2518c7c2 | 721 | if (delete) { |
03e1ad7b PM |
722 | *err = security_xfrm_policy_delete( |
723 | pol->security); | |
ef41aaa0 EP |
724 | if (*err) { |
725 | write_unlock_bh(&xfrm_policy_lock); | |
726 | return pol; | |
727 | } | |
2518c7c2 DM |
728 | hlist_del(&pol->bydst); |
729 | hlist_del(&pol->byidx); | |
730 | xfrm_policy_count[dir]--; | |
731 | } | |
732 | ret = pol; | |
1da177e4 LT |
733 | break; |
734 | } | |
735 | } | |
736 | write_unlock_bh(&xfrm_policy_lock); | |
737 | ||
2518c7c2 | 738 | if (ret && delete) { |
1da177e4 | 739 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 740 | xfrm_policy_kill(ret); |
1da177e4 | 741 | } |
2518c7c2 | 742 | return ret; |
1da177e4 LT |
743 | } |
744 | EXPORT_SYMBOL(xfrm_policy_byid); | |
745 | ||
4aa2e62c JL |
746 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
747 | static inline int | |
748 | xfrm_policy_flush_secctx_check(u8 type, struct xfrm_audit *audit_info) | |
1da177e4 | 749 | { |
4aa2e62c JL |
750 | int dir, err = 0; |
751 | ||
752 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { | |
753 | struct xfrm_policy *pol; | |
754 | struct hlist_node *entry; | |
755 | int i; | |
756 | ||
757 | hlist_for_each_entry(pol, entry, | |
758 | &xfrm_policy_inexact[dir], bydst) { | |
759 | if (pol->type != type) | |
760 | continue; | |
03e1ad7b | 761 | err = security_xfrm_policy_delete(pol->security); |
4aa2e62c | 762 | if (err) { |
ab5f5e8b JL |
763 | xfrm_audit_policy_delete(pol, 0, |
764 | audit_info->loginuid, | |
2532386f | 765 | audit_info->sessionid, |
ab5f5e8b | 766 | audit_info->secid); |
4aa2e62c JL |
767 | return err; |
768 | } | |
7dc12d6d | 769 | } |
4aa2e62c JL |
770 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { |
771 | hlist_for_each_entry(pol, entry, | |
772 | xfrm_policy_bydst[dir].table + i, | |
773 | bydst) { | |
774 | if (pol->type != type) | |
775 | continue; | |
03e1ad7b PM |
776 | err = security_xfrm_policy_delete( |
777 | pol->security); | |
4aa2e62c | 778 | if (err) { |
ab5f5e8b JL |
779 | xfrm_audit_policy_delete(pol, 0, |
780 | audit_info->loginuid, | |
2532386f | 781 | audit_info->sessionid, |
ab5f5e8b | 782 | audit_info->secid); |
4aa2e62c JL |
783 | return err; |
784 | } | |
785 | } | |
786 | } | |
787 | } | |
788 | return err; | |
789 | } | |
790 | #else | |
791 | static inline int | |
792 | xfrm_policy_flush_secctx_check(u8 type, struct xfrm_audit *audit_info) | |
793 | { | |
794 | return 0; | |
795 | } | |
796 | #endif | |
797 | ||
798 | int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info) | |
799 | { | |
800 | int dir, err = 0; | |
1da177e4 LT |
801 | |
802 | write_lock_bh(&xfrm_policy_lock); | |
4aa2e62c JL |
803 | |
804 | err = xfrm_policy_flush_secctx_check(type, audit_info); | |
805 | if (err) | |
806 | goto out; | |
807 | ||
1da177e4 | 808 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
2518c7c2 DM |
809 | struct xfrm_policy *pol; |
810 | struct hlist_node *entry; | |
ae8c0577 | 811 | int i, killed; |
2518c7c2 | 812 | |
ae8c0577 | 813 | killed = 0; |
2518c7c2 DM |
814 | again1: |
815 | hlist_for_each_entry(pol, entry, | |
816 | &xfrm_policy_inexact[dir], bydst) { | |
817 | if (pol->type != type) | |
818 | continue; | |
819 | hlist_del(&pol->bydst); | |
820 | hlist_del(&pol->byidx); | |
1da177e4 LT |
821 | write_unlock_bh(&xfrm_policy_lock); |
822 | ||
ab5f5e8b | 823 | xfrm_audit_policy_delete(pol, 1, audit_info->loginuid, |
2532386f | 824 | audit_info->sessionid, |
ab5f5e8b | 825 | audit_info->secid); |
161a09e7 | 826 | |
2518c7c2 | 827 | xfrm_policy_kill(pol); |
ae8c0577 | 828 | killed++; |
1da177e4 LT |
829 | |
830 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
831 | goto again1; |
832 | } | |
833 | ||
834 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { | |
835 | again2: | |
836 | hlist_for_each_entry(pol, entry, | |
837 | xfrm_policy_bydst[dir].table + i, | |
838 | bydst) { | |
839 | if (pol->type != type) | |
840 | continue; | |
841 | hlist_del(&pol->bydst); | |
842 | hlist_del(&pol->byidx); | |
843 | write_unlock_bh(&xfrm_policy_lock); | |
844 | ||
ab5f5e8b JL |
845 | xfrm_audit_policy_delete(pol, 1, |
846 | audit_info->loginuid, | |
2532386f | 847 | audit_info->sessionid, |
ab5f5e8b | 848 | audit_info->secid); |
2518c7c2 | 849 | xfrm_policy_kill(pol); |
ae8c0577 | 850 | killed++; |
2518c7c2 DM |
851 | |
852 | write_lock_bh(&xfrm_policy_lock); | |
853 | goto again2; | |
854 | } | |
1da177e4 | 855 | } |
2518c7c2 | 856 | |
ae8c0577 | 857 | xfrm_policy_count[dir] -= killed; |
1da177e4 LT |
858 | } |
859 | atomic_inc(&flow_cache_genid); | |
4aa2e62c | 860 | out: |
1da177e4 | 861 | write_unlock_bh(&xfrm_policy_lock); |
4aa2e62c | 862 | return err; |
1da177e4 LT |
863 | } |
864 | EXPORT_SYMBOL(xfrm_policy_flush); | |
865 | ||
4c563f76 TT |
866 | int xfrm_policy_walk(struct xfrm_policy_walk *walk, |
867 | int (*func)(struct xfrm_policy *, int, int, void*), | |
1da177e4 LT |
868 | void *data) |
869 | { | |
4c563f76 TT |
870 | struct xfrm_policy *old, *pol, *last = NULL; |
871 | int error = 0; | |
872 | ||
873 | if (walk->type >= XFRM_POLICY_TYPE_MAX && | |
874 | walk->type != XFRM_POLICY_TYPE_ANY) | |
875 | return -EINVAL; | |
1da177e4 | 876 | |
4c563f76 TT |
877 | if (walk->policy == NULL && walk->count != 0) |
878 | return 0; | |
879 | ||
880 | old = pol = walk->policy; | |
881 | walk->policy = NULL; | |
1da177e4 | 882 | read_lock_bh(&xfrm_policy_lock); |
1da177e4 | 883 | |
4c563f76 TT |
884 | for (; walk->cur_type < XFRM_POLICY_TYPE_MAX; walk->cur_type++) { |
885 | if (walk->type != walk->cur_type && | |
886 | walk->type != XFRM_POLICY_TYPE_ANY) | |
887 | continue; | |
2518c7c2 | 888 | |
4c563f76 TT |
889 | if (pol == NULL) { |
890 | pol = list_first_entry(&xfrm_policy_bytype[walk->cur_type], | |
891 | struct xfrm_policy, bytype); | |
892 | } | |
893 | list_for_each_entry_from(pol, &xfrm_policy_bytype[walk->cur_type], bytype) { | |
894 | if (pol->dead) | |
2518c7c2 | 895 | continue; |
baf5d743 | 896 | if (last) { |
4c563f76 TT |
897 | error = func(last, xfrm_policy_id2dir(last->index), |
898 | walk->count, data); | |
899 | if (error) { | |
900 | xfrm_pol_hold(last); | |
901 | walk->policy = last; | |
baf5d743 | 902 | goto out; |
baf5d743 | 903 | } |
2518c7c2 | 904 | } |
4c563f76 TT |
905 | last = pol; |
906 | walk->count++; | |
2518c7c2 | 907 | } |
4c563f76 | 908 | pol = NULL; |
1da177e4 | 909 | } |
4c563f76 | 910 | if (walk->count == 0) { |
baf5d743 JHS |
911 | error = -ENOENT; |
912 | goto out; | |
913 | } | |
4c563f76 TT |
914 | if (last) |
915 | error = func(last, xfrm_policy_id2dir(last->index), 0, data); | |
1da177e4 LT |
916 | out: |
917 | read_unlock_bh(&xfrm_policy_lock); | |
4c563f76 TT |
918 | if (old != NULL) |
919 | xfrm_pol_put(old); | |
1da177e4 LT |
920 | return error; |
921 | } | |
922 | EXPORT_SYMBOL(xfrm_policy_walk); | |
923 | ||
134b0fc5 JM |
924 | /* |
925 | * Find policy to apply to this flow. | |
926 | * | |
927 | * Returns 0 if policy found, else an -errno. | |
928 | */ | |
2518c7c2 DM |
929 | static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl, |
930 | u8 type, u16 family, int dir) | |
1da177e4 | 931 | { |
2518c7c2 | 932 | struct xfrm_selector *sel = &pol->selector; |
134b0fc5 | 933 | int match, ret = -ESRCH; |
1da177e4 | 934 | |
2518c7c2 DM |
935 | if (pol->family != family || |
936 | pol->type != type) | |
134b0fc5 | 937 | return ret; |
1da177e4 | 938 | |
2518c7c2 | 939 | match = xfrm_selector_match(sel, fl, family); |
134b0fc5 | 940 | if (match) |
03e1ad7b PM |
941 | ret = security_xfrm_policy_lookup(pol->security, fl->secid, |
942 | dir); | |
2518c7c2 | 943 | |
134b0fc5 | 944 | return ret; |
2518c7c2 | 945 | } |
1da177e4 | 946 | |
2518c7c2 DM |
947 | static struct xfrm_policy *xfrm_policy_lookup_bytype(u8 type, struct flowi *fl, |
948 | u16 family, u8 dir) | |
949 | { | |
134b0fc5 | 950 | int err; |
2518c7c2 DM |
951 | struct xfrm_policy *pol, *ret; |
952 | xfrm_address_t *daddr, *saddr; | |
953 | struct hlist_node *entry; | |
954 | struct hlist_head *chain; | |
acba48e1 | 955 | u32 priority = ~0U; |
df71837d | 956 | |
2518c7c2 DM |
957 | daddr = xfrm_flowi_daddr(fl, family); |
958 | saddr = xfrm_flowi_saddr(fl, family); | |
959 | if (unlikely(!daddr || !saddr)) | |
960 | return NULL; | |
961 | ||
962 | read_lock_bh(&xfrm_policy_lock); | |
963 | chain = policy_hash_direct(daddr, saddr, family, dir); | |
964 | ret = NULL; | |
965 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
966 | err = xfrm_policy_match(pol, fl, type, family, dir); |
967 | if (err) { | |
968 | if (err == -ESRCH) | |
969 | continue; | |
970 | else { | |
971 | ret = ERR_PTR(err); | |
972 | goto fail; | |
973 | } | |
974 | } else { | |
2518c7c2 | 975 | ret = pol; |
acba48e1 | 976 | priority = ret->priority; |
2518c7c2 DM |
977 | break; |
978 | } | |
979 | } | |
acba48e1 DM |
980 | chain = &xfrm_policy_inexact[dir]; |
981 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
982 | err = xfrm_policy_match(pol, fl, type, family, dir); |
983 | if (err) { | |
984 | if (err == -ESRCH) | |
985 | continue; | |
986 | else { | |
987 | ret = ERR_PTR(err); | |
988 | goto fail; | |
989 | } | |
990 | } else if (pol->priority < priority) { | |
acba48e1 DM |
991 | ret = pol; |
992 | break; | |
1da177e4 LT |
993 | } |
994 | } | |
acba48e1 DM |
995 | if (ret) |
996 | xfrm_pol_hold(ret); | |
134b0fc5 | 997 | fail: |
1da177e4 | 998 | read_unlock_bh(&xfrm_policy_lock); |
4e81bb83 | 999 | |
2518c7c2 | 1000 | return ret; |
4e81bb83 MN |
1001 | } |
1002 | ||
134b0fc5 | 1003 | static int xfrm_policy_lookup(struct flowi *fl, u16 family, u8 dir, |
4e81bb83 MN |
1004 | void **objp, atomic_t **obj_refp) |
1005 | { | |
1006 | struct xfrm_policy *pol; | |
134b0fc5 | 1007 | int err = 0; |
4e81bb83 MN |
1008 | |
1009 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1010 | pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_SUB, fl, family, dir); | |
134b0fc5 JM |
1011 | if (IS_ERR(pol)) { |
1012 | err = PTR_ERR(pol); | |
1013 | pol = NULL; | |
1014 | } | |
1015 | if (pol || err) | |
4e81bb83 MN |
1016 | goto end; |
1017 | #endif | |
1018 | pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, fl, family, dir); | |
134b0fc5 JM |
1019 | if (IS_ERR(pol)) { |
1020 | err = PTR_ERR(pol); | |
1021 | pol = NULL; | |
1022 | } | |
4e81bb83 | 1023 | #ifdef CONFIG_XFRM_SUB_POLICY |
2518c7c2 | 1024 | end: |
4e81bb83 | 1025 | #endif |
1da177e4 LT |
1026 | if ((*objp = (void *) pol) != NULL) |
1027 | *obj_refp = &pol->refcnt; | |
134b0fc5 | 1028 | return err; |
1da177e4 LT |
1029 | } |
1030 | ||
df71837d TJ |
1031 | static inline int policy_to_flow_dir(int dir) |
1032 | { | |
1033 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
a716c119 YH |
1034 | XFRM_POLICY_OUT == FLOW_DIR_OUT && |
1035 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
1036 | return dir; | |
1037 | switch (dir) { | |
1038 | default: | |
1039 | case XFRM_POLICY_IN: | |
1040 | return FLOW_DIR_IN; | |
1041 | case XFRM_POLICY_OUT: | |
1042 | return FLOW_DIR_OUT; | |
1043 | case XFRM_POLICY_FWD: | |
1044 | return FLOW_DIR_FWD; | |
3ff50b79 | 1045 | } |
df71837d TJ |
1046 | } |
1047 | ||
e0d1caa7 | 1048 | static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl) |
1da177e4 LT |
1049 | { |
1050 | struct xfrm_policy *pol; | |
1051 | ||
1052 | read_lock_bh(&xfrm_policy_lock); | |
1053 | if ((pol = sk->sk_policy[dir]) != NULL) { | |
a716c119 | 1054 | int match = xfrm_selector_match(&pol->selector, fl, |
1da177e4 | 1055 | sk->sk_family); |
a716c119 | 1056 | int err = 0; |
df71837d | 1057 | |
3bccfbc7 | 1058 | if (match) { |
03e1ad7b PM |
1059 | err = security_xfrm_policy_lookup(pol->security, |
1060 | fl->secid, | |
1061 | policy_to_flow_dir(dir)); | |
3bccfbc7 VY |
1062 | if (!err) |
1063 | xfrm_pol_hold(pol); | |
1064 | else if (err == -ESRCH) | |
1065 | pol = NULL; | |
1066 | else | |
1067 | pol = ERR_PTR(err); | |
1068 | } else | |
1da177e4 LT |
1069 | pol = NULL; |
1070 | } | |
1071 | read_unlock_bh(&xfrm_policy_lock); | |
1072 | return pol; | |
1073 | } | |
1074 | ||
1075 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) | |
1076 | { | |
2518c7c2 DM |
1077 | struct hlist_head *chain = policy_hash_bysel(&pol->selector, |
1078 | pol->family, dir); | |
4e81bb83 | 1079 | |
225f4005 | 1080 | list_add_tail(&pol->bytype, &xfrm_policy_bytype[pol->type]); |
2518c7c2 DM |
1081 | hlist_add_head(&pol->bydst, chain); |
1082 | hlist_add_head(&pol->byidx, xfrm_policy_byidx+idx_hash(pol->index)); | |
1083 | xfrm_policy_count[dir]++; | |
1da177e4 | 1084 | xfrm_pol_hold(pol); |
2518c7c2 DM |
1085 | |
1086 | if (xfrm_bydst_should_resize(dir, NULL)) | |
1087 | schedule_work(&xfrm_hash_work); | |
1da177e4 LT |
1088 | } |
1089 | ||
1090 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, | |
1091 | int dir) | |
1092 | { | |
2518c7c2 DM |
1093 | if (hlist_unhashed(&pol->bydst)) |
1094 | return NULL; | |
1da177e4 | 1095 | |
2518c7c2 DM |
1096 | hlist_del(&pol->bydst); |
1097 | hlist_del(&pol->byidx); | |
1098 | xfrm_policy_count[dir]--; | |
1099 | ||
1100 | return pol; | |
1da177e4 LT |
1101 | } |
1102 | ||
4666faab | 1103 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir) |
1da177e4 LT |
1104 | { |
1105 | write_lock_bh(&xfrm_policy_lock); | |
1106 | pol = __xfrm_policy_unlink(pol, dir); | |
1107 | write_unlock_bh(&xfrm_policy_lock); | |
1108 | if (pol) { | |
1109 | if (dir < XFRM_POLICY_MAX) | |
1110 | atomic_inc(&flow_cache_genid); | |
1111 | xfrm_policy_kill(pol); | |
4666faab | 1112 | return 0; |
1da177e4 | 1113 | } |
4666faab | 1114 | return -ENOENT; |
1da177e4 | 1115 | } |
a70fcb0b | 1116 | EXPORT_SYMBOL(xfrm_policy_delete); |
1da177e4 LT |
1117 | |
1118 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) | |
1119 | { | |
1120 | struct xfrm_policy *old_pol; | |
1121 | ||
4e81bb83 MN |
1122 | #ifdef CONFIG_XFRM_SUB_POLICY |
1123 | if (pol && pol->type != XFRM_POLICY_TYPE_MAIN) | |
1124 | return -EINVAL; | |
1125 | #endif | |
1126 | ||
1da177e4 LT |
1127 | write_lock_bh(&xfrm_policy_lock); |
1128 | old_pol = sk->sk_policy[dir]; | |
1129 | sk->sk_policy[dir] = pol; | |
1130 | if (pol) { | |
9d729f72 | 1131 | pol->curlft.add_time = get_seconds(); |
4e81bb83 | 1132 | pol->index = xfrm_gen_index(pol->type, XFRM_POLICY_MAX+dir); |
1da177e4 LT |
1133 | __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir); |
1134 | } | |
1135 | if (old_pol) | |
1136 | __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir); | |
1137 | write_unlock_bh(&xfrm_policy_lock); | |
1138 | ||
1139 | if (old_pol) { | |
1140 | xfrm_policy_kill(old_pol); | |
1141 | } | |
1142 | return 0; | |
1143 | } | |
1144 | ||
1145 | static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir) | |
1146 | { | |
1147 | struct xfrm_policy *newp = xfrm_policy_alloc(GFP_ATOMIC); | |
1148 | ||
1149 | if (newp) { | |
1150 | newp->selector = old->selector; | |
03e1ad7b PM |
1151 | if (security_xfrm_policy_clone(old->security, |
1152 | &newp->security)) { | |
df71837d TJ |
1153 | kfree(newp); |
1154 | return NULL; /* ENOMEM */ | |
1155 | } | |
1da177e4 LT |
1156 | newp->lft = old->lft; |
1157 | newp->curlft = old->curlft; | |
1158 | newp->action = old->action; | |
1159 | newp->flags = old->flags; | |
1160 | newp->xfrm_nr = old->xfrm_nr; | |
1161 | newp->index = old->index; | |
4e81bb83 | 1162 | newp->type = old->type; |
1da177e4 LT |
1163 | memcpy(newp->xfrm_vec, old->xfrm_vec, |
1164 | newp->xfrm_nr*sizeof(struct xfrm_tmpl)); | |
1165 | write_lock_bh(&xfrm_policy_lock); | |
1166 | __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir); | |
1167 | write_unlock_bh(&xfrm_policy_lock); | |
1168 | xfrm_pol_put(newp); | |
1169 | } | |
1170 | return newp; | |
1171 | } | |
1172 | ||
1173 | int __xfrm_sk_clone_policy(struct sock *sk) | |
1174 | { | |
1175 | struct xfrm_policy *p0 = sk->sk_policy[0], | |
1176 | *p1 = sk->sk_policy[1]; | |
1177 | ||
1178 | sk->sk_policy[0] = sk->sk_policy[1] = NULL; | |
1179 | if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL) | |
1180 | return -ENOMEM; | |
1181 | if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL) | |
1182 | return -ENOMEM; | |
1183 | return 0; | |
1184 | } | |
1185 | ||
a1e59abf PM |
1186 | static int |
1187 | xfrm_get_saddr(xfrm_address_t *local, xfrm_address_t *remote, | |
1188 | unsigned short family) | |
1189 | { | |
1190 | int err; | |
1191 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1192 | ||
1193 | if (unlikely(afinfo == NULL)) | |
1194 | return -EINVAL; | |
1195 | err = afinfo->get_saddr(local, remote); | |
1196 | xfrm_policy_put_afinfo(afinfo); | |
1197 | return err; | |
1198 | } | |
1199 | ||
1da177e4 LT |
1200 | /* Resolve list of templates for the flow, given policy. */ |
1201 | ||
1202 | static int | |
4e81bb83 MN |
1203 | xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl, |
1204 | struct xfrm_state **xfrm, | |
1205 | unsigned short family) | |
1da177e4 LT |
1206 | { |
1207 | int nx; | |
1208 | int i, error; | |
1209 | xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); | |
1210 | xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); | |
a1e59abf | 1211 | xfrm_address_t tmp; |
1da177e4 LT |
1212 | |
1213 | for (nx=0, i = 0; i < policy->xfrm_nr; i++) { | |
1214 | struct xfrm_state *x; | |
1215 | xfrm_address_t *remote = daddr; | |
1216 | xfrm_address_t *local = saddr; | |
1217 | struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; | |
1218 | ||
48b8d783 JK |
1219 | if (tmpl->mode == XFRM_MODE_TUNNEL || |
1220 | tmpl->mode == XFRM_MODE_BEET) { | |
1da177e4 LT |
1221 | remote = &tmpl->id.daddr; |
1222 | local = &tmpl->saddr; | |
76b3f055 | 1223 | family = tmpl->encap_family; |
a1e59abf PM |
1224 | if (xfrm_addr_any(local, family)) { |
1225 | error = xfrm_get_saddr(&tmp, remote, family); | |
1226 | if (error) | |
1227 | goto fail; | |
1228 | local = &tmp; | |
1229 | } | |
1da177e4 LT |
1230 | } |
1231 | ||
1232 | x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); | |
1233 | ||
1234 | if (x && x->km.state == XFRM_STATE_VALID) { | |
1235 | xfrm[nx++] = x; | |
1236 | daddr = remote; | |
1237 | saddr = local; | |
1238 | continue; | |
1239 | } | |
1240 | if (x) { | |
1241 | error = (x->km.state == XFRM_STATE_ERROR ? | |
1242 | -EINVAL : -EAGAIN); | |
1243 | xfrm_state_put(x); | |
1244 | } | |
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 | */ | |
14e50e57 DM |
1537 | int __xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl, |
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 MN |
1566 | if (IS_ERR(policy)) { |
1567 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLERROR); | |
75b8c133 | 1568 | goto dropdst; |
0aa64774 | 1569 | } |
3bccfbc7 | 1570 | } |
1da177e4 LT |
1571 | |
1572 | if (!policy) { | |
1573 | /* To accelerate a bit... */ | |
2518c7c2 DM |
1574 | if ((dst_orig->flags & DST_NOXFRM) || |
1575 | !xfrm_policy_count[XFRM_POLICY_OUT]) | |
8b7817f3 | 1576 | goto nopol; |
1da177e4 | 1577 | |
e0d1caa7 | 1578 | policy = flow_cache_lookup(fl, dst_orig->ops->family, |
42cf93cd | 1579 | dir, xfrm_policy_lookup); |
75b8c133 | 1580 | err = PTR_ERR(policy); |
d66e37a9 MN |
1581 | if (IS_ERR(policy)) { |
1582 | XFRM_INC_STATS(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 */ | |
0aa64774 | 1605 | XFRM_INC_STATS(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)) { | |
0aa64774 | 1625 | XFRM_INC_STATS(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) { | |
1635 | pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, | |
1636 | fl, family, | |
1637 | XFRM_POLICY_OUT); | |
1638 | if (pols[1]) { | |
134b0fc5 | 1639 | if (IS_ERR(pols[1])) { |
0aa64774 | 1640 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLERROR); |
134b0fc5 JM |
1641 | err = PTR_ERR(pols[1]); |
1642 | goto error; | |
1643 | } | |
4e81bb83 | 1644 | if (pols[1]->action == XFRM_POLICY_BLOCK) { |
0aa64774 | 1645 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLBLOCK); |
4e81bb83 MN |
1646 | err = -EPERM; |
1647 | goto error; | |
1648 | } | |
1649 | npols ++; | |
1650 | xfrm_nr += pols[1]->xfrm_nr; | |
1651 | } | |
1652 | } | |
1653 | ||
1654 | /* | |
1655 | * Because neither flowi nor bundle information knows about | |
1656 | * transformation template size. On more than one policy usage | |
1657 | * we can realize whether all of them is bypass or not after | |
1658 | * they are searched. See above not-transformed bypass | |
1659 | * is surrounded by non-sub policy configuration, too. | |
1660 | */ | |
1661 | if (xfrm_nr == 0) { | |
1662 | /* Flow passes not transformed. */ | |
1663 | xfrm_pols_put(pols, npols); | |
1664 | return 0; | |
1665 | } | |
1666 | ||
1667 | #endif | |
1668 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); | |
1da177e4 LT |
1669 | |
1670 | if (unlikely(nx<0)) { | |
1671 | err = nx; | |
14e50e57 DM |
1672 | if (err == -EAGAIN && sysctl_xfrm_larval_drop) { |
1673 | /* EREMOTE tells the caller to generate | |
1674 | * a one-shot blackhole route. | |
1675 | */ | |
d66e37a9 | 1676 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES); |
14e50e57 DM |
1677 | xfrm_pol_put(policy); |
1678 | return -EREMOTE; | |
1679 | } | |
815f4e57 | 1680 | if (err == -EAGAIN && (flags & XFRM_LOOKUP_WAIT)) { |
1da177e4 LT |
1681 | DECLARE_WAITQUEUE(wait, current); |
1682 | ||
1683 | add_wait_queue(&km_waitq, &wait); | |
1684 | set_current_state(TASK_INTERRUPTIBLE); | |
1685 | schedule(); | |
1686 | set_current_state(TASK_RUNNING); | |
1687 | remove_wait_queue(&km_waitq, &wait); | |
1688 | ||
4e81bb83 | 1689 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); |
1da177e4 LT |
1690 | |
1691 | if (nx == -EAGAIN && signal_pending(current)) { | |
0aa64774 | 1692 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES); |
1da177e4 LT |
1693 | err = -ERESTART; |
1694 | goto error; | |
1695 | } | |
1696 | if (nx == -EAGAIN || | |
1697 | genid != atomic_read(&flow_cache_genid)) { | |
4e81bb83 | 1698 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1699 | goto restart; |
1700 | } | |
1701 | err = nx; | |
1702 | } | |
0aa64774 MN |
1703 | if (err < 0) { |
1704 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES); | |
1da177e4 | 1705 | goto error; |
0aa64774 | 1706 | } |
1da177e4 LT |
1707 | } |
1708 | if (nx == 0) { | |
1709 | /* Flow passes not transformed. */ | |
4e81bb83 | 1710 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1711 | return 0; |
1712 | } | |
1713 | ||
25ee3286 HX |
1714 | dst = xfrm_bundle_create(policy, xfrm, nx, fl, dst_orig); |
1715 | err = PTR_ERR(dst); | |
0aa64774 MN |
1716 | if (IS_ERR(dst)) { |
1717 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLEGENERROR); | |
1da177e4 | 1718 | goto error; |
0aa64774 | 1719 | } |
1da177e4 | 1720 | |
4e81bb83 MN |
1721 | for (pi = 0; pi < npols; pi++) { |
1722 | read_lock_bh(&pols[pi]->lock); | |
1723 | pol_dead |= pols[pi]->dead; | |
1724 | read_unlock_bh(&pols[pi]->lock); | |
1725 | } | |
1726 | ||
1da177e4 | 1727 | write_lock_bh(&policy->lock); |
4e81bb83 | 1728 | if (unlikely(pol_dead || stale_bundle(dst))) { |
1da177e4 LT |
1729 | /* Wow! While we worked on resolving, this |
1730 | * policy has gone. Retry. It is not paranoia, | |
1731 | * we just cannot enlist new bundle to dead object. | |
1732 | * We can't enlist stable bundles either. | |
1733 | */ | |
1734 | write_unlock_bh(&policy->lock); | |
9d7d7402 | 1735 | dst_free(dst); |
00de651d | 1736 | |
0aa64774 MN |
1737 | if (pol_dead) |
1738 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLDEAD); | |
1739 | else | |
1740 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR); | |
00de651d HX |
1741 | err = -EHOSTUNREACH; |
1742 | goto error; | |
1da177e4 | 1743 | } |
157bfc25 MN |
1744 | |
1745 | if (npols > 1) | |
1746 | err = xfrm_dst_update_parent(dst, &pols[1]->selector); | |
1747 | else | |
1748 | err = xfrm_dst_update_origin(dst, fl); | |
1749 | if (unlikely(err)) { | |
1750 | write_unlock_bh(&policy->lock); | |
9d7d7402 | 1751 | dst_free(dst); |
0aa64774 | 1752 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR); |
157bfc25 MN |
1753 | goto error; |
1754 | } | |
1755 | ||
1da177e4 LT |
1756 | dst->next = policy->bundles; |
1757 | policy->bundles = dst; | |
1758 | dst_hold(dst); | |
1759 | write_unlock_bh(&policy->lock); | |
1760 | } | |
1761 | *dst_p = dst; | |
1762 | dst_release(dst_orig); | |
a716c119 | 1763 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1764 | return 0; |
1765 | ||
1766 | error: | |
4e81bb83 | 1767 | xfrm_pols_put(pols, npols); |
75b8c133 HX |
1768 | dropdst: |
1769 | dst_release(dst_orig); | |
1da177e4 LT |
1770 | *dst_p = NULL; |
1771 | return err; | |
8b7817f3 HX |
1772 | |
1773 | nopol: | |
aef21785 | 1774 | err = -ENOENT; |
8b7817f3 HX |
1775 | if (flags & XFRM_LOOKUP_ICMP) |
1776 | goto dropdst; | |
1777 | return 0; | |
1da177e4 | 1778 | } |
14e50e57 DM |
1779 | EXPORT_SYMBOL(__xfrm_lookup); |
1780 | ||
1781 | int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl, | |
1782 | struct sock *sk, int flags) | |
1783 | { | |
1784 | int err = __xfrm_lookup(dst_p, fl, sk, flags); | |
1785 | ||
1786 | if (err == -EREMOTE) { | |
1787 | dst_release(*dst_p); | |
1788 | *dst_p = NULL; | |
1789 | err = -EAGAIN; | |
1790 | } | |
1791 | ||
1792 | return err; | |
1793 | } | |
1da177e4 LT |
1794 | EXPORT_SYMBOL(xfrm_lookup); |
1795 | ||
df0ba92a MN |
1796 | static inline int |
1797 | xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl) | |
1798 | { | |
1799 | struct xfrm_state *x; | |
df0ba92a MN |
1800 | |
1801 | if (!skb->sp || idx < 0 || idx >= skb->sp->len) | |
1802 | return 0; | |
1803 | x = skb->sp->xvec[idx]; | |
1804 | if (!x->type->reject) | |
1805 | return 0; | |
1ecafede | 1806 | return x->type->reject(x, skb, fl); |
df0ba92a MN |
1807 | } |
1808 | ||
1da177e4 LT |
1809 | /* When skb is transformed back to its "native" form, we have to |
1810 | * check policy restrictions. At the moment we make this in maximally | |
1811 | * stupid way. Shame on me. :-) Of course, connected sockets must | |
1812 | * have policy cached at them. | |
1813 | */ | |
1814 | ||
1815 | static inline int | |
a716c119 | 1816 | xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x, |
1da177e4 LT |
1817 | unsigned short family) |
1818 | { | |
1819 | if (xfrm_state_kern(x)) | |
928ba416 | 1820 | return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family); |
1da177e4 LT |
1821 | return x->id.proto == tmpl->id.proto && |
1822 | (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && | |
1823 | (x->props.reqid == tmpl->reqid || !tmpl->reqid) && | |
1824 | x->props.mode == tmpl->mode && | |
c5d18e98 | 1825 | (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) || |
f3bd4840 | 1826 | !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) && |
7e49e6de MN |
1827 | !(x->props.mode != XFRM_MODE_TRANSPORT && |
1828 | xfrm_state_addr_cmp(tmpl, x, family)); | |
1da177e4 LT |
1829 | } |
1830 | ||
df0ba92a MN |
1831 | /* |
1832 | * 0 or more than 0 is returned when validation is succeeded (either bypass | |
1833 | * because of optional transport mode, or next index of the mathced secpath | |
1834 | * state with the template. | |
1835 | * -1 is returned when no matching template is found. | |
1836 | * Otherwise "-2 - errored_index" is returned. | |
1837 | */ | |
1da177e4 LT |
1838 | static inline int |
1839 | xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start, | |
1840 | unsigned short family) | |
1841 | { | |
1842 | int idx = start; | |
1843 | ||
1844 | if (tmpl->optional) { | |
7e49e6de | 1845 | if (tmpl->mode == XFRM_MODE_TRANSPORT) |
1da177e4 LT |
1846 | return start; |
1847 | } else | |
1848 | start = -1; | |
1849 | for (; idx < sp->len; idx++) { | |
dbe5b4aa | 1850 | if (xfrm_state_ok(tmpl, sp->xvec[idx], family)) |
1da177e4 | 1851 | return ++idx; |
df0ba92a MN |
1852 | if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) { |
1853 | if (start == -1) | |
1854 | start = -2-idx; | |
1da177e4 | 1855 | break; |
df0ba92a | 1856 | } |
1da177e4 LT |
1857 | } |
1858 | return start; | |
1859 | } | |
1860 | ||
d5422efe HX |
1861 | int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, |
1862 | unsigned int family, int reverse) | |
1da177e4 LT |
1863 | { |
1864 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
e0d1caa7 | 1865 | int err; |
1da177e4 LT |
1866 | |
1867 | if (unlikely(afinfo == NULL)) | |
1868 | return -EAFNOSUPPORT; | |
1869 | ||
d5422efe | 1870 | afinfo->decode_session(skb, fl, reverse); |
beb8d13b | 1871 | err = security_xfrm_decode_session(skb, &fl->secid); |
1da177e4 | 1872 | xfrm_policy_put_afinfo(afinfo); |
e0d1caa7 | 1873 | return err; |
1da177e4 | 1874 | } |
d5422efe | 1875 | EXPORT_SYMBOL(__xfrm_decode_session); |
1da177e4 | 1876 | |
df0ba92a | 1877 | static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp) |
1da177e4 LT |
1878 | { |
1879 | for (; k < sp->len; k++) { | |
df0ba92a | 1880 | if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) { |
d1d9facf | 1881 | *idxp = k; |
1da177e4 | 1882 | return 1; |
df0ba92a | 1883 | } |
1da177e4 LT |
1884 | } |
1885 | ||
1886 | return 0; | |
1887 | } | |
1888 | ||
a716c119 | 1889 | int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, |
1da177e4 LT |
1890 | unsigned short family) |
1891 | { | |
1892 | struct xfrm_policy *pol; | |
4e81bb83 MN |
1893 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
1894 | int npols = 0; | |
1895 | int xfrm_nr; | |
1896 | int pi; | |
d5422efe | 1897 | int reverse; |
1da177e4 | 1898 | struct flowi fl; |
d5422efe | 1899 | u8 fl_dir; |
df0ba92a | 1900 | int xerr_idx = -1; |
1da177e4 | 1901 | |
d5422efe HX |
1902 | reverse = dir & ~XFRM_POLICY_MASK; |
1903 | dir &= XFRM_POLICY_MASK; | |
1904 | fl_dir = policy_to_flow_dir(dir); | |
1905 | ||
0aa64774 MN |
1906 | if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) { |
1907 | XFRM_INC_STATS(LINUX_MIB_XFRMINHDRERROR); | |
1da177e4 | 1908 | return 0; |
0aa64774 MN |
1909 | } |
1910 | ||
eb9c7ebe | 1911 | nf_nat_decode_session(skb, &fl, family); |
1da177e4 LT |
1912 | |
1913 | /* First, check used SA against their selectors. */ | |
1914 | if (skb->sp) { | |
1915 | int i; | |
1916 | ||
1917 | for (i=skb->sp->len-1; i>=0; i--) { | |
dbe5b4aa | 1918 | struct xfrm_state *x = skb->sp->xvec[i]; |
0aa64774 MN |
1919 | if (!xfrm_selector_match(&x->sel, &fl, family)) { |
1920 | XFRM_INC_STATS(LINUX_MIB_XFRMINSTATEMISMATCH); | |
1da177e4 | 1921 | return 0; |
0aa64774 | 1922 | } |
1da177e4 LT |
1923 | } |
1924 | } | |
1925 | ||
1926 | pol = NULL; | |
3bccfbc7 | 1927 | if (sk && sk->sk_policy[dir]) { |
e0d1caa7 | 1928 | pol = xfrm_sk_policy_lookup(sk, dir, &fl); |
0aa64774 MN |
1929 | if (IS_ERR(pol)) { |
1930 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR); | |
3bccfbc7 | 1931 | return 0; |
0aa64774 | 1932 | } |
3bccfbc7 | 1933 | } |
1da177e4 LT |
1934 | |
1935 | if (!pol) | |
e0d1caa7 | 1936 | pol = flow_cache_lookup(&fl, family, fl_dir, |
1da177e4 LT |
1937 | xfrm_policy_lookup); |
1938 | ||
0aa64774 MN |
1939 | if (IS_ERR(pol)) { |
1940 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR); | |
134b0fc5 | 1941 | return 0; |
0aa64774 | 1942 | } |
134b0fc5 | 1943 | |
df0ba92a | 1944 | if (!pol) { |
d1d9facf | 1945 | if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) { |
df0ba92a | 1946 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
0aa64774 | 1947 | XFRM_INC_STATS(LINUX_MIB_XFRMINNOPOLS); |
df0ba92a MN |
1948 | return 0; |
1949 | } | |
1950 | return 1; | |
1951 | } | |
1da177e4 | 1952 | |
9d729f72 | 1953 | pol->curlft.use_time = get_seconds(); |
1da177e4 | 1954 | |
4e81bb83 MN |
1955 | pols[0] = pol; |
1956 | npols ++; | |
1957 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1958 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1959 | pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, | |
1960 | &fl, family, | |
1961 | XFRM_POLICY_IN); | |
1962 | if (pols[1]) { | |
0aa64774 MN |
1963 | if (IS_ERR(pols[1])) { |
1964 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR); | |
134b0fc5 | 1965 | return 0; |
0aa64774 | 1966 | } |
9d729f72 | 1967 | pols[1]->curlft.use_time = get_seconds(); |
4e81bb83 MN |
1968 | npols ++; |
1969 | } | |
1970 | } | |
1971 | #endif | |
1972 | ||
1da177e4 LT |
1973 | if (pol->action == XFRM_POLICY_ALLOW) { |
1974 | struct sec_path *sp; | |
1975 | static struct sec_path dummy; | |
4e81bb83 | 1976 | struct xfrm_tmpl *tp[XFRM_MAX_DEPTH]; |
41a49cc3 | 1977 | struct xfrm_tmpl *stp[XFRM_MAX_DEPTH]; |
4e81bb83 MN |
1978 | struct xfrm_tmpl **tpp = tp; |
1979 | int ti = 0; | |
1da177e4 LT |
1980 | int i, k; |
1981 | ||
1982 | if ((sp = skb->sp) == NULL) | |
1983 | sp = &dummy; | |
1984 | ||
4e81bb83 MN |
1985 | for (pi = 0; pi < npols; pi++) { |
1986 | if (pols[pi] != pol && | |
0aa64774 MN |
1987 | pols[pi]->action != XFRM_POLICY_ALLOW) { |
1988 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLBLOCK); | |
4e81bb83 | 1989 | goto reject; |
0aa64774 MN |
1990 | } |
1991 | if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
1992 | XFRM_INC_STATS(LINUX_MIB_XFRMINBUFFERERROR); | |
4e81bb83 | 1993 | goto reject_error; |
0aa64774 | 1994 | } |
4e81bb83 MN |
1995 | for (i = 0; i < pols[pi]->xfrm_nr; i++) |
1996 | tpp[ti++] = &pols[pi]->xfrm_vec[i]; | |
1997 | } | |
1998 | xfrm_nr = ti; | |
41a49cc3 MN |
1999 | if (npols > 1) { |
2000 | xfrm_tmpl_sort(stp, tpp, xfrm_nr, family); | |
2001 | tpp = stp; | |
2002 | } | |
4e81bb83 | 2003 | |
1da177e4 LT |
2004 | /* For each tunnel xfrm, find the first matching tmpl. |
2005 | * For each tmpl before that, find corresponding xfrm. | |
2006 | * Order is _important_. Later we will implement | |
2007 | * some barriers, but at the moment barriers | |
2008 | * are implied between each two transformations. | |
2009 | */ | |
4e81bb83 MN |
2010 | for (i = xfrm_nr-1, k = 0; i >= 0; i--) { |
2011 | k = xfrm_policy_ok(tpp[i], sp, k, family); | |
df0ba92a | 2012 | if (k < 0) { |
d1d9facf JM |
2013 | if (k < -1) |
2014 | /* "-2 - errored_index" returned */ | |
2015 | xerr_idx = -(2+k); | |
0aa64774 | 2016 | XFRM_INC_STATS(LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 2017 | goto reject; |
df0ba92a | 2018 | } |
1da177e4 LT |
2019 | } |
2020 | ||
0aa64774 MN |
2021 | if (secpath_has_nontransport(sp, k, &xerr_idx)) { |
2022 | XFRM_INC_STATS(LINUX_MIB_XFRMINTMPLMISMATCH); | |
1da177e4 | 2023 | goto reject; |
0aa64774 | 2024 | } |
1da177e4 | 2025 | |
4e81bb83 | 2026 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
2027 | return 1; |
2028 | } | |
0aa64774 | 2029 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLBLOCK); |
1da177e4 LT |
2030 | |
2031 | reject: | |
df0ba92a | 2032 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
4e81bb83 MN |
2033 | reject_error: |
2034 | xfrm_pols_put(pols, npols); | |
1da177e4 LT |
2035 | return 0; |
2036 | } | |
2037 | EXPORT_SYMBOL(__xfrm_policy_check); | |
2038 | ||
2039 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
2040 | { | |
2041 | struct flowi fl; | |
2042 | ||
0aa64774 MN |
2043 | if (xfrm_decode_session(skb, &fl, family) < 0) { |
2044 | /* XXX: we should have something like FWDHDRERROR here. */ | |
2045 | XFRM_INC_STATS(LINUX_MIB_XFRMINHDRERROR); | |
1da177e4 | 2046 | return 0; |
0aa64774 | 2047 | } |
1da177e4 LT |
2048 | |
2049 | return xfrm_lookup(&skb->dst, &fl, NULL, 0) == 0; | |
2050 | } | |
2051 | EXPORT_SYMBOL(__xfrm_route_forward); | |
2052 | ||
d49c73c7 DM |
2053 | /* Optimize later using cookies and generation ids. */ |
2054 | ||
1da177e4 LT |
2055 | static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) |
2056 | { | |
d49c73c7 DM |
2057 | /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete |
2058 | * to "-1" to force all XFRM destinations to get validated by | |
2059 | * dst_ops->check on every use. We do this because when a | |
2060 | * normal route referenced by an XFRM dst is obsoleted we do | |
2061 | * not go looking around for all parent referencing XFRM dsts | |
2062 | * so that we can invalidate them. It is just too much work. | |
2063 | * Instead we make the checks here on every use. For example: | |
2064 | * | |
2065 | * XFRM dst A --> IPv4 dst X | |
2066 | * | |
2067 | * X is the "xdst->route" of A (X is also the "dst->path" of A | |
2068 | * in this example). If X is marked obsolete, "A" will not | |
2069 | * notice. That's what we are validating here via the | |
2070 | * stale_bundle() check. | |
2071 | * | |
2072 | * When a policy's bundle is pruned, we dst_free() the XFRM | |
2073 | * dst which causes it's ->obsolete field to be set to a | |
2074 | * positive non-zero integer. If an XFRM dst has been pruned | |
2075 | * like this, we want to force a new route lookup. | |
399c180a | 2076 | */ |
d49c73c7 DM |
2077 | if (dst->obsolete < 0 && !stale_bundle(dst)) |
2078 | return dst; | |
2079 | ||
1da177e4 LT |
2080 | return NULL; |
2081 | } | |
2082 | ||
2083 | static int stale_bundle(struct dst_entry *dst) | |
2084 | { | |
5b368e61 | 2085 | return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0); |
1da177e4 LT |
2086 | } |
2087 | ||
aabc9761 | 2088 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
1da177e4 | 2089 | { |
1da177e4 | 2090 | while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { |
c346dca1 | 2091 | dst->dev = dev_net(dev)->loopback_dev; |
de3cb747 | 2092 | dev_hold(dst->dev); |
1da177e4 LT |
2093 | dev_put(dev); |
2094 | } | |
2095 | } | |
aabc9761 | 2096 | EXPORT_SYMBOL(xfrm_dst_ifdown); |
1da177e4 LT |
2097 | |
2098 | static void xfrm_link_failure(struct sk_buff *skb) | |
2099 | { | |
2100 | /* Impossible. Such dst must be popped before reaches point of failure. */ | |
2101 | return; | |
2102 | } | |
2103 | ||
2104 | static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) | |
2105 | { | |
2106 | if (dst) { | |
2107 | if (dst->obsolete) { | |
2108 | dst_release(dst); | |
2109 | dst = NULL; | |
2110 | } | |
2111 | } | |
2112 | return dst; | |
2113 | } | |
2114 | ||
2518c7c2 DM |
2115 | static void prune_one_bundle(struct xfrm_policy *pol, int (*func)(struct dst_entry *), struct dst_entry **gc_list_p) |
2116 | { | |
2117 | struct dst_entry *dst, **dstp; | |
2118 | ||
2119 | write_lock(&pol->lock); | |
2120 | dstp = &pol->bundles; | |
2121 | while ((dst=*dstp) != NULL) { | |
2122 | if (func(dst)) { | |
2123 | *dstp = dst->next; | |
2124 | dst->next = *gc_list_p; | |
2125 | *gc_list_p = dst; | |
2126 | } else { | |
2127 | dstp = &dst->next; | |
2128 | } | |
2129 | } | |
2130 | write_unlock(&pol->lock); | |
2131 | } | |
2132 | ||
1da177e4 LT |
2133 | static void xfrm_prune_bundles(int (*func)(struct dst_entry *)) |
2134 | { | |
2518c7c2 DM |
2135 | struct dst_entry *gc_list = NULL; |
2136 | int dir; | |
1da177e4 LT |
2137 | |
2138 | read_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
2139 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
2140 | struct xfrm_policy *pol; | |
2141 | struct hlist_node *entry; | |
2142 | struct hlist_head *table; | |
2143 | int i; | |
4e81bb83 | 2144 | |
2518c7c2 DM |
2145 | hlist_for_each_entry(pol, entry, |
2146 | &xfrm_policy_inexact[dir], bydst) | |
2147 | prune_one_bundle(pol, func, &gc_list); | |
2148 | ||
2149 | table = xfrm_policy_bydst[dir].table; | |
2150 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { | |
2151 | hlist_for_each_entry(pol, entry, table + i, bydst) | |
2152 | prune_one_bundle(pol, func, &gc_list); | |
1da177e4 LT |
2153 | } |
2154 | } | |
2155 | read_unlock_bh(&xfrm_policy_lock); | |
2156 | ||
2157 | while (gc_list) { | |
2518c7c2 | 2158 | struct dst_entry *dst = gc_list; |
1da177e4 LT |
2159 | gc_list = dst->next; |
2160 | dst_free(dst); | |
2161 | } | |
2162 | } | |
2163 | ||
2164 | static int unused_bundle(struct dst_entry *dst) | |
2165 | { | |
2166 | return !atomic_read(&dst->__refcnt); | |
2167 | } | |
2168 | ||
2169 | static void __xfrm_garbage_collect(void) | |
2170 | { | |
2171 | xfrm_prune_bundles(unused_bundle); | |
2172 | } | |
2173 | ||
1c095399 | 2174 | static int xfrm_flush_bundles(void) |
1da177e4 LT |
2175 | { |
2176 | xfrm_prune_bundles(stale_bundle); | |
2177 | return 0; | |
2178 | } | |
2179 | ||
25ee3286 | 2180 | static void xfrm_init_pmtu(struct dst_entry *dst) |
1da177e4 LT |
2181 | { |
2182 | do { | |
2183 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2184 | u32 pmtu, route_mtu_cached; | |
2185 | ||
2186 | pmtu = dst_mtu(dst->child); | |
2187 | xdst->child_mtu_cached = pmtu; | |
2188 | ||
2189 | pmtu = xfrm_state_mtu(dst->xfrm, pmtu); | |
2190 | ||
2191 | route_mtu_cached = dst_mtu(xdst->route); | |
2192 | xdst->route_mtu_cached = route_mtu_cached; | |
2193 | ||
2194 | if (pmtu > route_mtu_cached) | |
2195 | pmtu = route_mtu_cached; | |
2196 | ||
2197 | dst->metrics[RTAX_MTU-1] = pmtu; | |
2198 | } while ((dst = dst->next)); | |
2199 | } | |
2200 | ||
1da177e4 LT |
2201 | /* Check that the bundle accepts the flow and its components are |
2202 | * still valid. | |
2203 | */ | |
2204 | ||
5b368e61 VY |
2205 | int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first, |
2206 | struct flowi *fl, int family, int strict) | |
1da177e4 LT |
2207 | { |
2208 | struct dst_entry *dst = &first->u.dst; | |
2209 | struct xfrm_dst *last; | |
2210 | u32 mtu; | |
2211 | ||
92d63dec | 2212 | if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || |
1da177e4 LT |
2213 | (dst->dev && !netif_running(dst->dev))) |
2214 | return 0; | |
157bfc25 MN |
2215 | #ifdef CONFIG_XFRM_SUB_POLICY |
2216 | if (fl) { | |
2217 | if (first->origin && !flow_cache_uli_match(first->origin, fl)) | |
2218 | return 0; | |
2219 | if (first->partner && | |
2220 | !xfrm_selector_match(first->partner, fl, family)) | |
2221 | return 0; | |
2222 | } | |
2223 | #endif | |
1da177e4 LT |
2224 | |
2225 | last = NULL; | |
2226 | ||
2227 | do { | |
2228 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2229 | ||
2230 | if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family)) | |
2231 | return 0; | |
67f83cbf VY |
2232 | if (fl && pol && |
2233 | !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl)) | |
e0d1caa7 | 2234 | return 0; |
1da177e4 LT |
2235 | if (dst->xfrm->km.state != XFRM_STATE_VALID) |
2236 | return 0; | |
9d4a706d DM |
2237 | if (xdst->genid != dst->xfrm->genid) |
2238 | return 0; | |
e53820de | 2239 | |
1bfcb10f | 2240 | if (strict && fl && |
13996378 | 2241 | !(dst->xfrm->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) && |
e53820de MN |
2242 | !xfrm_state_addr_flow_check(dst->xfrm, fl, family)) |
2243 | return 0; | |
1da177e4 LT |
2244 | |
2245 | mtu = dst_mtu(dst->child); | |
2246 | if (xdst->child_mtu_cached != mtu) { | |
2247 | last = xdst; | |
2248 | xdst->child_mtu_cached = mtu; | |
2249 | } | |
2250 | ||
92d63dec | 2251 | if (!dst_check(xdst->route, xdst->route_cookie)) |
1da177e4 LT |
2252 | return 0; |
2253 | mtu = dst_mtu(xdst->route); | |
2254 | if (xdst->route_mtu_cached != mtu) { | |
2255 | last = xdst; | |
2256 | xdst->route_mtu_cached = mtu; | |
2257 | } | |
2258 | ||
2259 | dst = dst->child; | |
2260 | } while (dst->xfrm); | |
2261 | ||
2262 | if (likely(!last)) | |
2263 | return 1; | |
2264 | ||
2265 | mtu = last->child_mtu_cached; | |
2266 | for (;;) { | |
2267 | dst = &last->u.dst; | |
2268 | ||
2269 | mtu = xfrm_state_mtu(dst->xfrm, mtu); | |
2270 | if (mtu > last->route_mtu_cached) | |
2271 | mtu = last->route_mtu_cached; | |
2272 | dst->metrics[RTAX_MTU-1] = mtu; | |
2273 | ||
2274 | if (last == first) | |
2275 | break; | |
2276 | ||
bd0bf076 | 2277 | last = (struct xfrm_dst *)last->u.dst.next; |
1da177e4 LT |
2278 | last->child_mtu_cached = mtu; |
2279 | } | |
2280 | ||
2281 | return 1; | |
2282 | } | |
2283 | ||
2284 | EXPORT_SYMBOL(xfrm_bundle_ok); | |
2285 | ||
1da177e4 LT |
2286 | int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) |
2287 | { | |
2288 | int err = 0; | |
2289 | if (unlikely(afinfo == NULL)) | |
2290 | return -EINVAL; | |
2291 | if (unlikely(afinfo->family >= NPROTO)) | |
2292 | return -EAFNOSUPPORT; | |
e959d812 | 2293 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2294 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) |
2295 | err = -ENOBUFS; | |
2296 | else { | |
2297 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2298 | if (likely(dst_ops->kmem_cachep == NULL)) | |
2299 | dst_ops->kmem_cachep = xfrm_dst_cache; | |
2300 | if (likely(dst_ops->check == NULL)) | |
2301 | dst_ops->check = xfrm_dst_check; | |
1da177e4 LT |
2302 | if (likely(dst_ops->negative_advice == NULL)) |
2303 | dst_ops->negative_advice = xfrm_negative_advice; | |
2304 | if (likely(dst_ops->link_failure == NULL)) | |
2305 | dst_ops->link_failure = xfrm_link_failure; | |
1da177e4 LT |
2306 | if (likely(afinfo->garbage_collect == NULL)) |
2307 | afinfo->garbage_collect = __xfrm_garbage_collect; | |
2308 | xfrm_policy_afinfo[afinfo->family] = afinfo; | |
2309 | } | |
e959d812 | 2310 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2311 | return err; |
2312 | } | |
2313 | EXPORT_SYMBOL(xfrm_policy_register_afinfo); | |
2314 | ||
2315 | int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2316 | { | |
2317 | int err = 0; | |
2318 | if (unlikely(afinfo == NULL)) | |
2319 | return -EINVAL; | |
2320 | if (unlikely(afinfo->family >= NPROTO)) | |
2321 | return -EAFNOSUPPORT; | |
e959d812 | 2322 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2323 | if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { |
2324 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) | |
2325 | err = -EINVAL; | |
2326 | else { | |
2327 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2328 | xfrm_policy_afinfo[afinfo->family] = NULL; | |
2329 | dst_ops->kmem_cachep = NULL; | |
2330 | dst_ops->check = NULL; | |
1da177e4 LT |
2331 | dst_ops->negative_advice = NULL; |
2332 | dst_ops->link_failure = NULL; | |
1da177e4 LT |
2333 | afinfo->garbage_collect = NULL; |
2334 | } | |
2335 | } | |
e959d812 | 2336 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2337 | return err; |
2338 | } | |
2339 | EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); | |
2340 | ||
2341 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) | |
2342 | { | |
2343 | struct xfrm_policy_afinfo *afinfo; | |
2344 | if (unlikely(family >= NPROTO)) | |
2345 | return NULL; | |
2346 | read_lock(&xfrm_policy_afinfo_lock); | |
2347 | afinfo = xfrm_policy_afinfo[family]; | |
546be240 HX |
2348 | if (unlikely(!afinfo)) |
2349 | read_unlock(&xfrm_policy_afinfo_lock); | |
1da177e4 LT |
2350 | return afinfo; |
2351 | } | |
2352 | ||
2353 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2354 | { | |
546be240 HX |
2355 | read_unlock(&xfrm_policy_afinfo_lock); |
2356 | } | |
2357 | ||
1da177e4 LT |
2358 | static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) |
2359 | { | |
e9dc8653 EB |
2360 | struct net_device *dev = ptr; |
2361 | ||
721499e8 | 2362 | if (!net_eq(dev_net(dev), &init_net)) |
e9dc8653 EB |
2363 | return NOTIFY_DONE; |
2364 | ||
1da177e4 LT |
2365 | switch (event) { |
2366 | case NETDEV_DOWN: | |
2367 | xfrm_flush_bundles(); | |
2368 | } | |
2369 | return NOTIFY_DONE; | |
2370 | } | |
2371 | ||
2372 | static struct notifier_block xfrm_dev_notifier = { | |
2373 | xfrm_dev_event, | |
2374 | NULL, | |
2375 | 0 | |
2376 | }; | |
2377 | ||
558f82ef MN |
2378 | #ifdef CONFIG_XFRM_STATISTICS |
2379 | static int __init xfrm_statistics_init(void) | |
2380 | { | |
2381 | if (snmp_mib_init((void **)xfrm_statistics, | |
2382 | sizeof(struct linux_xfrm_mib)) < 0) | |
2383 | return -ENOMEM; | |
2384 | return 0; | |
2385 | } | |
2386 | #endif | |
2387 | ||
1da177e4 LT |
2388 | static void __init xfrm_policy_init(void) |
2389 | { | |
2518c7c2 DM |
2390 | unsigned int hmask, sz; |
2391 | int dir; | |
2392 | ||
1da177e4 LT |
2393 | xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", |
2394 | sizeof(struct xfrm_dst), | |
e5d679f3 | 2395 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
20c2df83 | 2396 | NULL); |
1da177e4 | 2397 | |
2518c7c2 DM |
2398 | hmask = 8 - 1; |
2399 | sz = (hmask+1) * sizeof(struct hlist_head); | |
2400 | ||
44e36b42 | 2401 | xfrm_policy_byidx = xfrm_hash_alloc(sz); |
2518c7c2 DM |
2402 | xfrm_idx_hmask = hmask; |
2403 | if (!xfrm_policy_byidx) | |
2404 | panic("XFRM: failed to allocate byidx hash\n"); | |
2405 | ||
2406 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
2407 | struct xfrm_policy_hash *htab; | |
2408 | ||
2409 | INIT_HLIST_HEAD(&xfrm_policy_inexact[dir]); | |
2410 | ||
2411 | htab = &xfrm_policy_bydst[dir]; | |
44e36b42 | 2412 | htab->table = xfrm_hash_alloc(sz); |
2518c7c2 DM |
2413 | htab->hmask = hmask; |
2414 | if (!htab->table) | |
2415 | panic("XFRM: failed to allocate bydst hash\n"); | |
2416 | } | |
2417 | ||
4c563f76 TT |
2418 | for (dir = 0; dir < XFRM_POLICY_TYPE_MAX; dir++) |
2419 | INIT_LIST_HEAD(&xfrm_policy_bytype[dir]); | |
2420 | ||
c4028958 | 2421 | INIT_WORK(&xfrm_policy_gc_work, xfrm_policy_gc_task); |
1da177e4 LT |
2422 | register_netdevice_notifier(&xfrm_dev_notifier); |
2423 | } | |
2424 | ||
2425 | void __init xfrm_init(void) | |
2426 | { | |
558f82ef MN |
2427 | #ifdef CONFIG_XFRM_STATISTICS |
2428 | xfrm_statistics_init(); | |
2429 | #endif | |
1da177e4 LT |
2430 | xfrm_state_init(); |
2431 | xfrm_policy_init(); | |
2432 | xfrm_input_init(); | |
558f82ef MN |
2433 | #ifdef CONFIG_XFRM_STATISTICS |
2434 | xfrm_proc_init(); | |
2435 | #endif | |
1da177e4 LT |
2436 | } |
2437 | ||
ab5f5e8b | 2438 | #ifdef CONFIG_AUDITSYSCALL |
1486cbd7 IJ |
2439 | static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp, |
2440 | struct audit_buffer *audit_buf) | |
ab5f5e8b | 2441 | { |
875179fa PM |
2442 | struct xfrm_sec_ctx *ctx = xp->security; |
2443 | struct xfrm_selector *sel = &xp->selector; | |
2444 | ||
2445 | if (ctx) | |
ab5f5e8b | 2446 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", |
875179fa | 2447 | ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); |
ab5f5e8b | 2448 | |
875179fa | 2449 | switch(sel->family) { |
ab5f5e8b | 2450 | case AF_INET: |
875179fa PM |
2451 | audit_log_format(audit_buf, " src=" NIPQUAD_FMT, |
2452 | NIPQUAD(sel->saddr.a4)); | |
2453 | if (sel->prefixlen_s != 32) | |
2454 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2455 | sel->prefixlen_s); | |
2456 | audit_log_format(audit_buf, " dst=" NIPQUAD_FMT, | |
2457 | NIPQUAD(sel->daddr.a4)); | |
2458 | if (sel->prefixlen_d != 32) | |
2459 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2460 | sel->prefixlen_d); | |
ab5f5e8b JL |
2461 | break; |
2462 | case AF_INET6: | |
875179fa PM |
2463 | audit_log_format(audit_buf, " src=" NIP6_FMT, |
2464 | NIP6(*(struct in6_addr *)sel->saddr.a6)); | |
2465 | if (sel->prefixlen_s != 128) | |
2466 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2467 | sel->prefixlen_s); | |
2468 | audit_log_format(audit_buf, " dst=" NIP6_FMT, | |
2469 | NIP6(*(struct in6_addr *)sel->daddr.a6)); | |
2470 | if (sel->prefixlen_d != 128) | |
2471 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2472 | sel->prefixlen_d); | |
ab5f5e8b JL |
2473 | break; |
2474 | } | |
2475 | } | |
2476 | ||
68277acc | 2477 | void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, |
2532386f | 2478 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2479 | { |
2480 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2481 | |
afeb14b4 | 2482 | audit_buf = xfrm_audit_start("SPD-add"); |
ab5f5e8b JL |
2483 | if (audit_buf == NULL) |
2484 | return; | |
2532386f | 2485 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 | 2486 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
2487 | xfrm_audit_common_policyinfo(xp, audit_buf); |
2488 | audit_log_end(audit_buf); | |
2489 | } | |
2490 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_add); | |
2491 | ||
68277acc | 2492 | void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, |
2532386f | 2493 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2494 | { |
2495 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2496 | |
afeb14b4 | 2497 | audit_buf = xfrm_audit_start("SPD-delete"); |
ab5f5e8b JL |
2498 | if (audit_buf == NULL) |
2499 | return; | |
2532386f | 2500 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 | 2501 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
2502 | xfrm_audit_common_policyinfo(xp, audit_buf); |
2503 | audit_log_end(audit_buf); | |
2504 | } | |
2505 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete); | |
2506 | #endif | |
2507 | ||
80c9abaa SS |
2508 | #ifdef CONFIG_XFRM_MIGRATE |
2509 | static int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp, | |
2510 | struct xfrm_selector *sel_tgt) | |
2511 | { | |
2512 | if (sel_cmp->proto == IPSEC_ULPROTO_ANY) { | |
2513 | if (sel_tgt->family == sel_cmp->family && | |
2514 | xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr, | |
a716c119 | 2515 | sel_cmp->family) == 0 && |
80c9abaa SS |
2516 | xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr, |
2517 | sel_cmp->family) == 0 && | |
2518 | sel_tgt->prefixlen_d == sel_cmp->prefixlen_d && | |
2519 | sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) { | |
2520 | return 1; | |
2521 | } | |
2522 | } else { | |
2523 | if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) { | |
2524 | return 1; | |
2525 | } | |
2526 | } | |
2527 | return 0; | |
2528 | } | |
2529 | ||
2530 | static struct xfrm_policy * xfrm_migrate_policy_find(struct xfrm_selector *sel, | |
2531 | u8 dir, u8 type) | |
2532 | { | |
2533 | struct xfrm_policy *pol, *ret = NULL; | |
2534 | struct hlist_node *entry; | |
2535 | struct hlist_head *chain; | |
2536 | u32 priority = ~0U; | |
2537 | ||
2538 | read_lock_bh(&xfrm_policy_lock); | |
2539 | chain = policy_hash_direct(&sel->daddr, &sel->saddr, sel->family, dir); | |
2540 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
2541 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2542 | pol->type == type) { | |
2543 | ret = pol; | |
2544 | priority = ret->priority; | |
2545 | break; | |
2546 | } | |
2547 | } | |
2548 | chain = &xfrm_policy_inexact[dir]; | |
2549 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
2550 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2551 | pol->type == type && | |
2552 | pol->priority < priority) { | |
2553 | ret = pol; | |
2554 | break; | |
2555 | } | |
2556 | } | |
2557 | ||
2558 | if (ret) | |
2559 | xfrm_pol_hold(ret); | |
2560 | ||
2561 | read_unlock_bh(&xfrm_policy_lock); | |
2562 | ||
2563 | return ret; | |
2564 | } | |
2565 | ||
2566 | static int migrate_tmpl_match(struct xfrm_migrate *m, struct xfrm_tmpl *t) | |
2567 | { | |
2568 | int match = 0; | |
2569 | ||
2570 | if (t->mode == m->mode && t->id.proto == m->proto && | |
2571 | (m->reqid == 0 || t->reqid == m->reqid)) { | |
2572 | switch (t->mode) { | |
2573 | case XFRM_MODE_TUNNEL: | |
2574 | case XFRM_MODE_BEET: | |
2575 | if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr, | |
2576 | m->old_family) == 0 && | |
2577 | xfrm_addr_cmp(&t->saddr, &m->old_saddr, | |
2578 | m->old_family) == 0) { | |
2579 | match = 1; | |
2580 | } | |
2581 | break; | |
2582 | case XFRM_MODE_TRANSPORT: | |
2583 | /* in case of transport mode, template does not store | |
2584 | any IP addresses, hence we just compare mode and | |
2585 | protocol */ | |
2586 | match = 1; | |
2587 | break; | |
2588 | default: | |
2589 | break; | |
2590 | } | |
2591 | } | |
2592 | return match; | |
2593 | } | |
2594 | ||
2595 | /* update endpoint address(es) of template(s) */ | |
2596 | static int xfrm_policy_migrate(struct xfrm_policy *pol, | |
2597 | struct xfrm_migrate *m, int num_migrate) | |
2598 | { | |
2599 | struct xfrm_migrate *mp; | |
2600 | struct dst_entry *dst; | |
2601 | int i, j, n = 0; | |
2602 | ||
2603 | write_lock_bh(&pol->lock); | |
2604 | if (unlikely(pol->dead)) { | |
2605 | /* target policy has been deleted */ | |
2606 | write_unlock_bh(&pol->lock); | |
2607 | return -ENOENT; | |
2608 | } | |
2609 | ||
2610 | for (i = 0; i < pol->xfrm_nr; i++) { | |
2611 | for (j = 0, mp = m; j < num_migrate; j++, mp++) { | |
2612 | if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i])) | |
2613 | continue; | |
2614 | n++; | |
1bfcb10f HX |
2615 | if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL && |
2616 | pol->xfrm_vec[i].mode != XFRM_MODE_BEET) | |
80c9abaa SS |
2617 | continue; |
2618 | /* update endpoints */ | |
2619 | memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr, | |
2620 | sizeof(pol->xfrm_vec[i].id.daddr)); | |
2621 | memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr, | |
2622 | sizeof(pol->xfrm_vec[i].saddr)); | |
2623 | pol->xfrm_vec[i].encap_family = mp->new_family; | |
2624 | /* flush bundles */ | |
2625 | while ((dst = pol->bundles) != NULL) { | |
2626 | pol->bundles = dst->next; | |
2627 | dst_free(dst); | |
2628 | } | |
2629 | } | |
2630 | } | |
2631 | ||
2632 | write_unlock_bh(&pol->lock); | |
2633 | ||
2634 | if (!n) | |
2635 | return -ENODATA; | |
2636 | ||
2637 | return 0; | |
2638 | } | |
2639 | ||
2640 | static int xfrm_migrate_check(struct xfrm_migrate *m, int num_migrate) | |
2641 | { | |
2642 | int i, j; | |
2643 | ||
2644 | if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) | |
2645 | return -EINVAL; | |
2646 | ||
2647 | for (i = 0; i < num_migrate; i++) { | |
2648 | if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr, | |
2649 | m[i].old_family) == 0) && | |
2650 | (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr, | |
2651 | m[i].old_family) == 0)) | |
2652 | return -EINVAL; | |
2653 | if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) || | |
2654 | xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) | |
2655 | return -EINVAL; | |
2656 | ||
2657 | /* check if there is any duplicated entry */ | |
2658 | for (j = i + 1; j < num_migrate; j++) { | |
2659 | if (!memcmp(&m[i].old_daddr, &m[j].old_daddr, | |
2660 | sizeof(m[i].old_daddr)) && | |
2661 | !memcmp(&m[i].old_saddr, &m[j].old_saddr, | |
2662 | sizeof(m[i].old_saddr)) && | |
2663 | m[i].proto == m[j].proto && | |
2664 | m[i].mode == m[j].mode && | |
2665 | m[i].reqid == m[j].reqid && | |
2666 | m[i].old_family == m[j].old_family) | |
2667 | return -EINVAL; | |
2668 | } | |
2669 | } | |
2670 | ||
2671 | return 0; | |
2672 | } | |
2673 | ||
2674 | int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type, | |
2675 | struct xfrm_migrate *m, int num_migrate) | |
2676 | { | |
2677 | int i, err, nx_cur = 0, nx_new = 0; | |
2678 | struct xfrm_policy *pol = NULL; | |
2679 | struct xfrm_state *x, *xc; | |
2680 | struct xfrm_state *x_cur[XFRM_MAX_DEPTH]; | |
2681 | struct xfrm_state *x_new[XFRM_MAX_DEPTH]; | |
2682 | struct xfrm_migrate *mp; | |
2683 | ||
2684 | if ((err = xfrm_migrate_check(m, num_migrate)) < 0) | |
2685 | goto out; | |
2686 | ||
2687 | /* Stage 1 - find policy */ | |
2688 | if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) { | |
2689 | err = -ENOENT; | |
2690 | goto out; | |
2691 | } | |
2692 | ||
2693 | /* Stage 2 - find and update state(s) */ | |
2694 | for (i = 0, mp = m; i < num_migrate; i++, mp++) { | |
2695 | if ((x = xfrm_migrate_state_find(mp))) { | |
2696 | x_cur[nx_cur] = x; | |
2697 | nx_cur++; | |
2698 | if ((xc = xfrm_state_migrate(x, mp))) { | |
2699 | x_new[nx_new] = xc; | |
2700 | nx_new++; | |
2701 | } else { | |
2702 | err = -ENODATA; | |
2703 | goto restore_state; | |
2704 | } | |
2705 | } | |
2706 | } | |
2707 | ||
2708 | /* Stage 3 - update policy */ | |
2709 | if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0) | |
2710 | goto restore_state; | |
2711 | ||
2712 | /* Stage 4 - delete old state(s) */ | |
2713 | if (nx_cur) { | |
2714 | xfrm_states_put(x_cur, nx_cur); | |
2715 | xfrm_states_delete(x_cur, nx_cur); | |
2716 | } | |
2717 | ||
2718 | /* Stage 5 - announce */ | |
2719 | km_migrate(sel, dir, type, m, num_migrate); | |
2720 | ||
2721 | xfrm_pol_put(pol); | |
2722 | ||
2723 | return 0; | |
2724 | out: | |
2725 | return err; | |
2726 | ||
2727 | restore_state: | |
2728 | if (pol) | |
2729 | xfrm_pol_put(pol); | |
2730 | if (nx_cur) | |
2731 | xfrm_states_put(x_cur, nx_cur); | |
2732 | if (nx_new) | |
2733 | xfrm_states_delete(x_new, nx_new); | |
2734 | ||
2735 | return err; | |
2736 | } | |
e610e679 | 2737 | EXPORT_SYMBOL(xfrm_migrate); |
80c9abaa | 2738 | #endif |