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 | ||
12a169e7 | 49 | static struct list_head xfrm_policy_all; |
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 | ||
12a169e7 | 167 | if (xp->walk.dead) |
1da177e4 LT |
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) { | |
12a169e7 | 239 | INIT_LIST_HEAD(&policy->walk.all); |
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 | { |
12a169e7 | 255 | BUG_ON(!policy->walk.dead); |
1da177e4 | 256 | |
09a62660 | 257 | BUG_ON(policy->bundles); |
1da177e4 LT |
258 | |
259 | if (del_timer(&policy->timer)) | |
260 | BUG(); | |
261 | ||
03e1ad7b | 262 | security_xfrm_policy_free(policy->security); |
1da177e4 LT |
263 | kfree(policy); |
264 | } | |
64c31b3f | 265 | EXPORT_SYMBOL(xfrm_policy_destroy); |
1da177e4 LT |
266 | |
267 | static void xfrm_policy_gc_kill(struct xfrm_policy *policy) | |
268 | { | |
269 | struct dst_entry *dst; | |
270 | ||
271 | while ((dst = policy->bundles) != NULL) { | |
272 | policy->bundles = dst->next; | |
273 | dst_free(dst); | |
274 | } | |
275 | ||
276 | if (del_timer(&policy->timer)) | |
277 | atomic_dec(&policy->refcnt); | |
278 | ||
279 | if (atomic_read(&policy->refcnt) > 1) | |
280 | flow_cache_flush(); | |
281 | ||
282 | xfrm_pol_put(policy); | |
283 | } | |
284 | ||
c4028958 | 285 | static void xfrm_policy_gc_task(struct work_struct *work) |
1da177e4 LT |
286 | { |
287 | struct xfrm_policy *policy; | |
2518c7c2 DM |
288 | struct hlist_node *entry, *tmp; |
289 | struct hlist_head gc_list; | |
1da177e4 LT |
290 | |
291 | spin_lock_bh(&xfrm_policy_gc_lock); | |
2518c7c2 DM |
292 | gc_list.first = xfrm_policy_gc_list.first; |
293 | INIT_HLIST_HEAD(&xfrm_policy_gc_list); | |
1da177e4 LT |
294 | spin_unlock_bh(&xfrm_policy_gc_lock); |
295 | ||
2518c7c2 | 296 | hlist_for_each_entry_safe(policy, entry, tmp, &gc_list, bydst) |
1da177e4 | 297 | xfrm_policy_gc_kill(policy); |
1da177e4 LT |
298 | } |
299 | ||
300 | /* Rule must be locked. Release descentant resources, announce | |
301 | * entry dead. The rule must be unlinked from lists to the moment. | |
302 | */ | |
303 | ||
304 | static void xfrm_policy_kill(struct xfrm_policy *policy) | |
305 | { | |
306 | int dead; | |
307 | ||
308 | write_lock_bh(&policy->lock); | |
12a169e7 HX |
309 | dead = policy->walk.dead; |
310 | policy->walk.dead = 1; | |
1da177e4 LT |
311 | write_unlock_bh(&policy->lock); |
312 | ||
313 | if (unlikely(dead)) { | |
314 | WARN_ON(1); | |
315 | return; | |
316 | } | |
317 | ||
318 | spin_lock(&xfrm_policy_gc_lock); | |
2518c7c2 | 319 | hlist_add_head(&policy->bydst, &xfrm_policy_gc_list); |
1da177e4 LT |
320 | spin_unlock(&xfrm_policy_gc_lock); |
321 | ||
322 | schedule_work(&xfrm_policy_gc_work); | |
323 | } | |
324 | ||
2518c7c2 DM |
325 | struct xfrm_policy_hash { |
326 | struct hlist_head *table; | |
327 | unsigned int hmask; | |
328 | }; | |
329 | ||
330 | static struct hlist_head xfrm_policy_inexact[XFRM_POLICY_MAX*2]; | |
331 | static struct xfrm_policy_hash xfrm_policy_bydst[XFRM_POLICY_MAX*2] __read_mostly; | |
332 | static struct hlist_head *xfrm_policy_byidx __read_mostly; | |
333 | static unsigned int xfrm_idx_hmask __read_mostly; | |
334 | static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024; | |
335 | ||
2518c7c2 DM |
336 | static inline unsigned int idx_hash(u32 index) |
337 | { | |
338 | return __idx_hash(index, xfrm_idx_hmask); | |
339 | } | |
340 | ||
2518c7c2 DM |
341 | static struct hlist_head *policy_hash_bysel(struct xfrm_selector *sel, unsigned short family, int dir) |
342 | { | |
343 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
344 | unsigned int hash = __sel_hash(sel, family, hmask); | |
345 | ||
346 | return (hash == hmask + 1 ? | |
347 | &xfrm_policy_inexact[dir] : | |
348 | xfrm_policy_bydst[dir].table + hash); | |
349 | } | |
350 | ||
351 | static struct hlist_head *policy_hash_direct(xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir) | |
352 | { | |
353 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
354 | unsigned int hash = __addr_hash(daddr, saddr, family, hmask); | |
355 | ||
356 | return xfrm_policy_bydst[dir].table + hash; | |
357 | } | |
358 | ||
2518c7c2 DM |
359 | static void xfrm_dst_hash_transfer(struct hlist_head *list, |
360 | struct hlist_head *ndsttable, | |
361 | unsigned int nhashmask) | |
362 | { | |
b791160b | 363 | struct hlist_node *entry, *tmp, *entry0 = NULL; |
2518c7c2 | 364 | struct xfrm_policy *pol; |
b791160b | 365 | unsigned int h0 = 0; |
2518c7c2 | 366 | |
b791160b | 367 | redo: |
2518c7c2 DM |
368 | hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) { |
369 | unsigned int h; | |
370 | ||
371 | h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr, | |
372 | pol->family, nhashmask); | |
b791160b YH |
373 | if (!entry0) { |
374 | hlist_del(entry); | |
375 | hlist_add_head(&pol->bydst, ndsttable+h); | |
376 | h0 = h; | |
377 | } else { | |
378 | if (h != h0) | |
379 | continue; | |
380 | hlist_del(entry); | |
381 | hlist_add_after(entry0, &pol->bydst); | |
382 | } | |
383 | entry0 = entry; | |
384 | } | |
385 | if (!hlist_empty(list)) { | |
386 | entry0 = NULL; | |
387 | goto redo; | |
2518c7c2 DM |
388 | } |
389 | } | |
390 | ||
391 | static void xfrm_idx_hash_transfer(struct hlist_head *list, | |
392 | struct hlist_head *nidxtable, | |
393 | unsigned int nhashmask) | |
394 | { | |
395 | struct hlist_node *entry, *tmp; | |
396 | struct xfrm_policy *pol; | |
397 | ||
398 | hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) { | |
399 | unsigned int h; | |
400 | ||
401 | h = __idx_hash(pol->index, nhashmask); | |
402 | hlist_add_head(&pol->byidx, nidxtable+h); | |
403 | } | |
404 | } | |
405 | ||
406 | static unsigned long xfrm_new_hash_mask(unsigned int old_hmask) | |
407 | { | |
408 | return ((old_hmask + 1) << 1) - 1; | |
409 | } | |
410 | ||
411 | static void xfrm_bydst_resize(int dir) | |
412 | { | |
413 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
414 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); | |
415 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
416 | struct hlist_head *odst = xfrm_policy_bydst[dir].table; | |
44e36b42 | 417 | struct hlist_head *ndst = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
418 | int i; |
419 | ||
420 | if (!ndst) | |
421 | return; | |
422 | ||
423 | write_lock_bh(&xfrm_policy_lock); | |
424 | ||
425 | for (i = hmask; i >= 0; i--) | |
426 | xfrm_dst_hash_transfer(odst + i, ndst, nhashmask); | |
427 | ||
428 | xfrm_policy_bydst[dir].table = ndst; | |
429 | xfrm_policy_bydst[dir].hmask = nhashmask; | |
430 | ||
431 | write_unlock_bh(&xfrm_policy_lock); | |
432 | ||
44e36b42 | 433 | xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
434 | } |
435 | ||
436 | static void xfrm_byidx_resize(int total) | |
437 | { | |
438 | unsigned int hmask = xfrm_idx_hmask; | |
439 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); | |
440 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
441 | struct hlist_head *oidx = xfrm_policy_byidx; | |
44e36b42 | 442 | struct hlist_head *nidx = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
443 | int i; |
444 | ||
445 | if (!nidx) | |
446 | return; | |
447 | ||
448 | write_lock_bh(&xfrm_policy_lock); | |
449 | ||
450 | for (i = hmask; i >= 0; i--) | |
451 | xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask); | |
452 | ||
453 | xfrm_policy_byidx = nidx; | |
454 | xfrm_idx_hmask = nhashmask; | |
455 | ||
456 | write_unlock_bh(&xfrm_policy_lock); | |
457 | ||
44e36b42 | 458 | xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
459 | } |
460 | ||
461 | static inline int xfrm_bydst_should_resize(int dir, int *total) | |
462 | { | |
463 | unsigned int cnt = xfrm_policy_count[dir]; | |
464 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
465 | ||
466 | if (total) | |
467 | *total += cnt; | |
468 | ||
469 | if ((hmask + 1) < xfrm_policy_hashmax && | |
470 | cnt > hmask) | |
471 | return 1; | |
472 | ||
473 | return 0; | |
474 | } | |
475 | ||
476 | static inline int xfrm_byidx_should_resize(int total) | |
477 | { | |
478 | unsigned int hmask = xfrm_idx_hmask; | |
479 | ||
480 | if ((hmask + 1) < xfrm_policy_hashmax && | |
481 | total > hmask) | |
482 | return 1; | |
483 | ||
484 | return 0; | |
485 | } | |
486 | ||
5a6d3416 | 487 | void xfrm_spd_getinfo(struct xfrmk_spdinfo *si) |
ecfd6b18 JHS |
488 | { |
489 | read_lock_bh(&xfrm_policy_lock); | |
490 | si->incnt = xfrm_policy_count[XFRM_POLICY_IN]; | |
491 | si->outcnt = xfrm_policy_count[XFRM_POLICY_OUT]; | |
492 | si->fwdcnt = xfrm_policy_count[XFRM_POLICY_FWD]; | |
493 | si->inscnt = xfrm_policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX]; | |
494 | si->outscnt = xfrm_policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX]; | |
495 | si->fwdscnt = xfrm_policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX]; | |
496 | si->spdhcnt = xfrm_idx_hmask; | |
497 | si->spdhmcnt = xfrm_policy_hashmax; | |
498 | read_unlock_bh(&xfrm_policy_lock); | |
499 | } | |
500 | EXPORT_SYMBOL(xfrm_spd_getinfo); | |
2518c7c2 | 501 | |
ecfd6b18 | 502 | static DEFINE_MUTEX(hash_resize_mutex); |
c4028958 | 503 | static void xfrm_hash_resize(struct work_struct *__unused) |
2518c7c2 DM |
504 | { |
505 | int dir, total; | |
506 | ||
507 | mutex_lock(&hash_resize_mutex); | |
508 | ||
509 | total = 0; | |
510 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
511 | if (xfrm_bydst_should_resize(dir, &total)) | |
512 | xfrm_bydst_resize(dir); | |
513 | } | |
514 | if (xfrm_byidx_should_resize(total)) | |
515 | xfrm_byidx_resize(total); | |
516 | ||
517 | mutex_unlock(&hash_resize_mutex); | |
518 | } | |
519 | ||
c4028958 | 520 | static DECLARE_WORK(xfrm_hash_work, xfrm_hash_resize); |
2518c7c2 | 521 | |
1da177e4 LT |
522 | /* Generate new index... KAME seems to generate them ordered by cost |
523 | * of an absolute inpredictability of ordering of rules. This will not pass. */ | |
4e81bb83 | 524 | static u32 xfrm_gen_index(u8 type, int dir) |
1da177e4 | 525 | { |
1da177e4 LT |
526 | static u32 idx_generator; |
527 | ||
528 | for (;;) { | |
2518c7c2 DM |
529 | struct hlist_node *entry; |
530 | struct hlist_head *list; | |
531 | struct xfrm_policy *p; | |
532 | u32 idx; | |
533 | int found; | |
534 | ||
1da177e4 LT |
535 | idx = (idx_generator | dir); |
536 | idx_generator += 8; | |
537 | if (idx == 0) | |
538 | idx = 8; | |
2518c7c2 DM |
539 | list = xfrm_policy_byidx + idx_hash(idx); |
540 | found = 0; | |
541 | hlist_for_each_entry(p, entry, list, byidx) { | |
542 | if (p->index == idx) { | |
543 | found = 1; | |
1da177e4 | 544 | break; |
2518c7c2 | 545 | } |
1da177e4 | 546 | } |
2518c7c2 | 547 | if (!found) |
1da177e4 LT |
548 | return idx; |
549 | } | |
550 | } | |
551 | ||
2518c7c2 DM |
552 | static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2) |
553 | { | |
554 | u32 *p1 = (u32 *) s1; | |
555 | u32 *p2 = (u32 *) s2; | |
556 | int len = sizeof(struct xfrm_selector) / sizeof(u32); | |
557 | int i; | |
558 | ||
559 | for (i = 0; i < len; i++) { | |
560 | if (p1[i] != p2[i]) | |
561 | return 1; | |
562 | } | |
563 | ||
564 | return 0; | |
565 | } | |
566 | ||
1da177e4 LT |
567 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) |
568 | { | |
2518c7c2 DM |
569 | struct xfrm_policy *pol; |
570 | struct xfrm_policy *delpol; | |
571 | struct hlist_head *chain; | |
a6c7ab55 | 572 | struct hlist_node *entry, *newpos; |
9b78a82c | 573 | struct dst_entry *gc_list; |
1da177e4 LT |
574 | |
575 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
576 | chain = policy_hash_bysel(&policy->selector, policy->family, dir); |
577 | delpol = NULL; | |
578 | newpos = NULL; | |
2518c7c2 | 579 | hlist_for_each_entry(pol, entry, chain, bydst) { |
a6c7ab55 | 580 | if (pol->type == policy->type && |
2518c7c2 | 581 | !selector_cmp(&pol->selector, &policy->selector) && |
a6c7ab55 HX |
582 | xfrm_sec_ctx_match(pol->security, policy->security) && |
583 | !WARN_ON(delpol)) { | |
1da177e4 LT |
584 | if (excl) { |
585 | write_unlock_bh(&xfrm_policy_lock); | |
586 | return -EEXIST; | |
587 | } | |
1da177e4 LT |
588 | delpol = pol; |
589 | if (policy->priority > pol->priority) | |
590 | continue; | |
591 | } else if (policy->priority >= pol->priority) { | |
a6c7ab55 | 592 | newpos = &pol->bydst; |
1da177e4 LT |
593 | continue; |
594 | } | |
1da177e4 LT |
595 | if (delpol) |
596 | break; | |
1da177e4 LT |
597 | } |
598 | if (newpos) | |
2518c7c2 DM |
599 | hlist_add_after(newpos, &policy->bydst); |
600 | else | |
601 | hlist_add_head(&policy->bydst, chain); | |
1da177e4 | 602 | xfrm_pol_hold(policy); |
2518c7c2 | 603 | xfrm_policy_count[dir]++; |
1da177e4 | 604 | atomic_inc(&flow_cache_genid); |
2518c7c2 DM |
605 | if (delpol) { |
606 | hlist_del(&delpol->bydst); | |
607 | hlist_del(&delpol->byidx); | |
12a169e7 | 608 | list_del(&delpol->walk.all); |
2518c7c2 DM |
609 | xfrm_policy_count[dir]--; |
610 | } | |
4e81bb83 | 611 | policy->index = delpol ? delpol->index : xfrm_gen_index(policy->type, dir); |
2518c7c2 | 612 | hlist_add_head(&policy->byidx, xfrm_policy_byidx+idx_hash(policy->index)); |
9d729f72 | 613 | policy->curlft.add_time = get_seconds(); |
1da177e4 LT |
614 | policy->curlft.use_time = 0; |
615 | if (!mod_timer(&policy->timer, jiffies + HZ)) | |
616 | xfrm_pol_hold(policy); | |
12a169e7 | 617 | list_add(&policy->walk.all, &xfrm_policy_all); |
1da177e4 LT |
618 | write_unlock_bh(&xfrm_policy_lock); |
619 | ||
9b78a82c | 620 | if (delpol) |
1da177e4 | 621 | xfrm_policy_kill(delpol); |
2518c7c2 DM |
622 | else if (xfrm_bydst_should_resize(dir, NULL)) |
623 | schedule_work(&xfrm_hash_work); | |
9b78a82c DM |
624 | |
625 | read_lock_bh(&xfrm_policy_lock); | |
626 | gc_list = NULL; | |
2518c7c2 DM |
627 | entry = &policy->bydst; |
628 | hlist_for_each_entry_continue(policy, entry, bydst) { | |
9b78a82c DM |
629 | struct dst_entry *dst; |
630 | ||
631 | write_lock(&policy->lock); | |
632 | dst = policy->bundles; | |
633 | if (dst) { | |
634 | struct dst_entry *tail = dst; | |
635 | while (tail->next) | |
636 | tail = tail->next; | |
637 | tail->next = gc_list; | |
638 | gc_list = dst; | |
639 | ||
640 | policy->bundles = NULL; | |
641 | } | |
642 | write_unlock(&policy->lock); | |
1da177e4 | 643 | } |
9b78a82c DM |
644 | read_unlock_bh(&xfrm_policy_lock); |
645 | ||
646 | while (gc_list) { | |
647 | struct dst_entry *dst = gc_list; | |
648 | ||
649 | gc_list = dst->next; | |
650 | dst_free(dst); | |
651 | } | |
652 | ||
1da177e4 LT |
653 | return 0; |
654 | } | |
655 | EXPORT_SYMBOL(xfrm_policy_insert); | |
656 | ||
4e81bb83 MN |
657 | struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir, |
658 | struct xfrm_selector *sel, | |
ef41aaa0 EP |
659 | struct xfrm_sec_ctx *ctx, int delete, |
660 | int *err) | |
1da177e4 | 661 | { |
2518c7c2 DM |
662 | struct xfrm_policy *pol, *ret; |
663 | struct hlist_head *chain; | |
664 | struct hlist_node *entry; | |
1da177e4 | 665 | |
ef41aaa0 | 666 | *err = 0; |
1da177e4 | 667 | write_lock_bh(&xfrm_policy_lock); |
2518c7c2 DM |
668 | chain = policy_hash_bysel(sel, sel->family, dir); |
669 | ret = NULL; | |
670 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
671 | if (pol->type == type && | |
672 | !selector_cmp(sel, &pol->selector) && | |
673 | xfrm_sec_ctx_match(ctx, pol->security)) { | |
1da177e4 | 674 | xfrm_pol_hold(pol); |
2518c7c2 | 675 | if (delete) { |
03e1ad7b PM |
676 | *err = security_xfrm_policy_delete( |
677 | pol->security); | |
ef41aaa0 EP |
678 | if (*err) { |
679 | write_unlock_bh(&xfrm_policy_lock); | |
680 | return pol; | |
681 | } | |
2518c7c2 DM |
682 | hlist_del(&pol->bydst); |
683 | hlist_del(&pol->byidx); | |
12a169e7 | 684 | list_del(&pol->walk.all); |
2518c7c2 DM |
685 | xfrm_policy_count[dir]--; |
686 | } | |
687 | ret = pol; | |
1da177e4 LT |
688 | break; |
689 | } | |
690 | } | |
691 | write_unlock_bh(&xfrm_policy_lock); | |
692 | ||
2518c7c2 | 693 | if (ret && delete) { |
1da177e4 | 694 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 695 | xfrm_policy_kill(ret); |
1da177e4 | 696 | } |
2518c7c2 | 697 | return ret; |
1da177e4 | 698 | } |
df71837d | 699 | EXPORT_SYMBOL(xfrm_policy_bysel_ctx); |
1da177e4 | 700 | |
ef41aaa0 EP |
701 | struct xfrm_policy *xfrm_policy_byid(u8 type, int dir, u32 id, int delete, |
702 | int *err) | |
1da177e4 | 703 | { |
2518c7c2 DM |
704 | struct xfrm_policy *pol, *ret; |
705 | struct hlist_head *chain; | |
706 | struct hlist_node *entry; | |
1da177e4 | 707 | |
b5505c6e HX |
708 | *err = -ENOENT; |
709 | if (xfrm_policy_id2dir(id) != dir) | |
710 | return NULL; | |
711 | ||
ef41aaa0 | 712 | *err = 0; |
1da177e4 | 713 | write_lock_bh(&xfrm_policy_lock); |
2518c7c2 DM |
714 | chain = xfrm_policy_byidx + idx_hash(id); |
715 | ret = NULL; | |
716 | hlist_for_each_entry(pol, entry, chain, byidx) { | |
717 | if (pol->type == type && pol->index == id) { | |
1da177e4 | 718 | xfrm_pol_hold(pol); |
2518c7c2 | 719 | if (delete) { |
03e1ad7b PM |
720 | *err = security_xfrm_policy_delete( |
721 | pol->security); | |
ef41aaa0 EP |
722 | if (*err) { |
723 | write_unlock_bh(&xfrm_policy_lock); | |
724 | return pol; | |
725 | } | |
2518c7c2 DM |
726 | hlist_del(&pol->bydst); |
727 | hlist_del(&pol->byidx); | |
12a169e7 | 728 | list_del(&pol->walk.all); |
2518c7c2 DM |
729 | xfrm_policy_count[dir]--; |
730 | } | |
731 | ret = pol; | |
1da177e4 LT |
732 | break; |
733 | } | |
734 | } | |
735 | write_unlock_bh(&xfrm_policy_lock); | |
736 | ||
2518c7c2 | 737 | if (ret && delete) { |
1da177e4 | 738 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 739 | xfrm_policy_kill(ret); |
1da177e4 | 740 | } |
2518c7c2 | 741 | return ret; |
1da177e4 LT |
742 | } |
743 | EXPORT_SYMBOL(xfrm_policy_byid); | |
744 | ||
4aa2e62c JL |
745 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
746 | static inline int | |
747 | xfrm_policy_flush_secctx_check(u8 type, struct xfrm_audit *audit_info) | |
1da177e4 | 748 | { |
4aa2e62c JL |
749 | int dir, err = 0; |
750 | ||
751 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { | |
752 | struct xfrm_policy *pol; | |
753 | struct hlist_node *entry; | |
754 | int i; | |
755 | ||
756 | hlist_for_each_entry(pol, entry, | |
757 | &xfrm_policy_inexact[dir], bydst) { | |
758 | if (pol->type != type) | |
759 | continue; | |
03e1ad7b | 760 | err = security_xfrm_policy_delete(pol->security); |
4aa2e62c | 761 | if (err) { |
ab5f5e8b JL |
762 | xfrm_audit_policy_delete(pol, 0, |
763 | audit_info->loginuid, | |
2532386f | 764 | audit_info->sessionid, |
ab5f5e8b | 765 | audit_info->secid); |
4aa2e62c JL |
766 | return err; |
767 | } | |
7dc12d6d | 768 | } |
4aa2e62c JL |
769 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { |
770 | hlist_for_each_entry(pol, entry, | |
771 | xfrm_policy_bydst[dir].table + i, | |
772 | bydst) { | |
773 | if (pol->type != type) | |
774 | continue; | |
03e1ad7b PM |
775 | err = security_xfrm_policy_delete( |
776 | pol->security); | |
4aa2e62c | 777 | if (err) { |
ab5f5e8b JL |
778 | xfrm_audit_policy_delete(pol, 0, |
779 | audit_info->loginuid, | |
2532386f | 780 | audit_info->sessionid, |
ab5f5e8b | 781 | audit_info->secid); |
4aa2e62c JL |
782 | return err; |
783 | } | |
784 | } | |
785 | } | |
786 | } | |
787 | return err; | |
788 | } | |
789 | #else | |
790 | static inline int | |
791 | xfrm_policy_flush_secctx_check(u8 type, struct xfrm_audit *audit_info) | |
792 | { | |
793 | return 0; | |
794 | } | |
795 | #endif | |
796 | ||
797 | int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info) | |
798 | { | |
799 | int dir, err = 0; | |
1da177e4 LT |
800 | |
801 | write_lock_bh(&xfrm_policy_lock); | |
4aa2e62c JL |
802 | |
803 | err = xfrm_policy_flush_secctx_check(type, audit_info); | |
804 | if (err) | |
805 | goto out; | |
806 | ||
1da177e4 | 807 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
2518c7c2 DM |
808 | struct xfrm_policy *pol; |
809 | struct hlist_node *entry; | |
ae8c0577 | 810 | int i, killed; |
2518c7c2 | 811 | |
ae8c0577 | 812 | killed = 0; |
2518c7c2 DM |
813 | again1: |
814 | hlist_for_each_entry(pol, entry, | |
815 | &xfrm_policy_inexact[dir], bydst) { | |
816 | if (pol->type != type) | |
817 | continue; | |
818 | hlist_del(&pol->bydst); | |
819 | hlist_del(&pol->byidx); | |
1da177e4 LT |
820 | write_unlock_bh(&xfrm_policy_lock); |
821 | ||
ab5f5e8b | 822 | xfrm_audit_policy_delete(pol, 1, audit_info->loginuid, |
2532386f | 823 | audit_info->sessionid, |
ab5f5e8b | 824 | audit_info->secid); |
161a09e7 | 825 | |
2518c7c2 | 826 | xfrm_policy_kill(pol); |
ae8c0577 | 827 | killed++; |
1da177e4 LT |
828 | |
829 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
830 | goto again1; |
831 | } | |
832 | ||
833 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { | |
834 | again2: | |
835 | hlist_for_each_entry(pol, entry, | |
836 | xfrm_policy_bydst[dir].table + i, | |
837 | bydst) { | |
838 | if (pol->type != type) | |
839 | continue; | |
840 | hlist_del(&pol->bydst); | |
841 | hlist_del(&pol->byidx); | |
12a169e7 | 842 | list_del(&pol->walk.all); |
2518c7c2 DM |
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 | { | |
12a169e7 HX |
870 | struct xfrm_policy *pol; |
871 | struct xfrm_policy_walk_entry *x; | |
4c563f76 TT |
872 | int error = 0; |
873 | ||
874 | if (walk->type >= XFRM_POLICY_TYPE_MAX && | |
875 | walk->type != XFRM_POLICY_TYPE_ANY) | |
876 | return -EINVAL; | |
1da177e4 | 877 | |
12a169e7 | 878 | if (list_empty(&walk->walk.all) && walk->seq != 0) |
4c563f76 TT |
879 | return 0; |
880 | ||
12a169e7 HX |
881 | write_lock_bh(&xfrm_policy_lock); |
882 | if (list_empty(&walk->walk.all)) | |
883 | x = list_first_entry(&xfrm_policy_all, struct xfrm_policy_walk_entry, all); | |
884 | else | |
885 | x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all); | |
886 | list_for_each_entry_from(x, &xfrm_policy_all, all) { | |
887 | if (x->dead) | |
4c563f76 | 888 | continue; |
12a169e7 HX |
889 | pol = container_of(x, struct xfrm_policy, walk); |
890 | if (walk->type != XFRM_POLICY_TYPE_ANY && | |
891 | walk->type != pol->type) | |
892 | continue; | |
893 | error = func(pol, xfrm_policy_id2dir(pol->index), | |
894 | walk->seq, data); | |
895 | if (error) { | |
896 | list_move_tail(&walk->walk.all, &x->all); | |
897 | goto out; | |
2518c7c2 | 898 | } |
12a169e7 | 899 | walk->seq++; |
1da177e4 | 900 | } |
12a169e7 | 901 | if (walk->seq == 0) { |
baf5d743 JHS |
902 | error = -ENOENT; |
903 | goto out; | |
904 | } | |
12a169e7 | 905 | list_del_init(&walk->walk.all); |
1da177e4 | 906 | out: |
12a169e7 | 907 | write_unlock_bh(&xfrm_policy_lock); |
1da177e4 LT |
908 | return error; |
909 | } | |
910 | EXPORT_SYMBOL(xfrm_policy_walk); | |
911 | ||
12a169e7 HX |
912 | void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type) |
913 | { | |
914 | INIT_LIST_HEAD(&walk->walk.all); | |
915 | walk->walk.dead = 1; | |
916 | walk->type = type; | |
917 | walk->seq = 0; | |
918 | } | |
919 | EXPORT_SYMBOL(xfrm_policy_walk_init); | |
920 | ||
921 | void xfrm_policy_walk_done(struct xfrm_policy_walk *walk) | |
922 | { | |
923 | if (list_empty(&walk->walk.all)) | |
924 | return; | |
925 | ||
926 | write_lock_bh(&xfrm_policy_lock); | |
927 | list_del(&walk->walk.all); | |
928 | write_unlock_bh(&xfrm_policy_lock); | |
929 | } | |
930 | EXPORT_SYMBOL(xfrm_policy_walk_done); | |
931 | ||
134b0fc5 JM |
932 | /* |
933 | * Find policy to apply to this flow. | |
934 | * | |
935 | * Returns 0 if policy found, else an -errno. | |
936 | */ | |
2518c7c2 DM |
937 | static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl, |
938 | u8 type, u16 family, int dir) | |
1da177e4 | 939 | { |
2518c7c2 | 940 | struct xfrm_selector *sel = &pol->selector; |
134b0fc5 | 941 | int match, ret = -ESRCH; |
1da177e4 | 942 | |
2518c7c2 DM |
943 | if (pol->family != family || |
944 | pol->type != type) | |
134b0fc5 | 945 | return ret; |
1da177e4 | 946 | |
2518c7c2 | 947 | match = xfrm_selector_match(sel, fl, family); |
134b0fc5 | 948 | if (match) |
03e1ad7b PM |
949 | ret = security_xfrm_policy_lookup(pol->security, fl->secid, |
950 | dir); | |
2518c7c2 | 951 | |
134b0fc5 | 952 | return ret; |
2518c7c2 | 953 | } |
1da177e4 | 954 | |
2518c7c2 DM |
955 | static struct xfrm_policy *xfrm_policy_lookup_bytype(u8 type, struct flowi *fl, |
956 | u16 family, u8 dir) | |
957 | { | |
134b0fc5 | 958 | int err; |
2518c7c2 DM |
959 | struct xfrm_policy *pol, *ret; |
960 | xfrm_address_t *daddr, *saddr; | |
961 | struct hlist_node *entry; | |
962 | struct hlist_head *chain; | |
acba48e1 | 963 | u32 priority = ~0U; |
df71837d | 964 | |
2518c7c2 DM |
965 | daddr = xfrm_flowi_daddr(fl, family); |
966 | saddr = xfrm_flowi_saddr(fl, family); | |
967 | if (unlikely(!daddr || !saddr)) | |
968 | return NULL; | |
969 | ||
970 | read_lock_bh(&xfrm_policy_lock); | |
971 | chain = policy_hash_direct(daddr, saddr, family, dir); | |
972 | ret = NULL; | |
973 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
974 | err = xfrm_policy_match(pol, fl, type, family, dir); |
975 | if (err) { | |
976 | if (err == -ESRCH) | |
977 | continue; | |
978 | else { | |
979 | ret = ERR_PTR(err); | |
980 | goto fail; | |
981 | } | |
982 | } else { | |
2518c7c2 | 983 | ret = pol; |
acba48e1 | 984 | priority = ret->priority; |
2518c7c2 DM |
985 | break; |
986 | } | |
987 | } | |
acba48e1 DM |
988 | chain = &xfrm_policy_inexact[dir]; |
989 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
990 | err = xfrm_policy_match(pol, fl, type, family, dir); |
991 | if (err) { | |
992 | if (err == -ESRCH) | |
993 | continue; | |
994 | else { | |
995 | ret = ERR_PTR(err); | |
996 | goto fail; | |
997 | } | |
998 | } else if (pol->priority < priority) { | |
acba48e1 DM |
999 | ret = pol; |
1000 | break; | |
1da177e4 LT |
1001 | } |
1002 | } | |
acba48e1 DM |
1003 | if (ret) |
1004 | xfrm_pol_hold(ret); | |
134b0fc5 | 1005 | fail: |
1da177e4 | 1006 | read_unlock_bh(&xfrm_policy_lock); |
4e81bb83 | 1007 | |
2518c7c2 | 1008 | return ret; |
4e81bb83 MN |
1009 | } |
1010 | ||
134b0fc5 | 1011 | static int xfrm_policy_lookup(struct flowi *fl, u16 family, u8 dir, |
4e81bb83 MN |
1012 | void **objp, atomic_t **obj_refp) |
1013 | { | |
1014 | struct xfrm_policy *pol; | |
134b0fc5 | 1015 | int err = 0; |
4e81bb83 MN |
1016 | |
1017 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1018 | pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_SUB, fl, family, dir); | |
134b0fc5 JM |
1019 | if (IS_ERR(pol)) { |
1020 | err = PTR_ERR(pol); | |
1021 | pol = NULL; | |
1022 | } | |
1023 | if (pol || err) | |
4e81bb83 MN |
1024 | goto end; |
1025 | #endif | |
1026 | pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, fl, family, dir); | |
134b0fc5 JM |
1027 | if (IS_ERR(pol)) { |
1028 | err = PTR_ERR(pol); | |
1029 | pol = NULL; | |
1030 | } | |
4e81bb83 | 1031 | #ifdef CONFIG_XFRM_SUB_POLICY |
2518c7c2 | 1032 | end: |
4e81bb83 | 1033 | #endif |
1da177e4 LT |
1034 | if ((*objp = (void *) pol) != NULL) |
1035 | *obj_refp = &pol->refcnt; | |
134b0fc5 | 1036 | return err; |
1da177e4 LT |
1037 | } |
1038 | ||
df71837d TJ |
1039 | static inline int policy_to_flow_dir(int dir) |
1040 | { | |
1041 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
a716c119 YH |
1042 | XFRM_POLICY_OUT == FLOW_DIR_OUT && |
1043 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
1044 | return dir; | |
1045 | switch (dir) { | |
1046 | default: | |
1047 | case XFRM_POLICY_IN: | |
1048 | return FLOW_DIR_IN; | |
1049 | case XFRM_POLICY_OUT: | |
1050 | return FLOW_DIR_OUT; | |
1051 | case XFRM_POLICY_FWD: | |
1052 | return FLOW_DIR_FWD; | |
3ff50b79 | 1053 | } |
df71837d TJ |
1054 | } |
1055 | ||
e0d1caa7 | 1056 | static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl) |
1da177e4 LT |
1057 | { |
1058 | struct xfrm_policy *pol; | |
1059 | ||
1060 | read_lock_bh(&xfrm_policy_lock); | |
1061 | if ((pol = sk->sk_policy[dir]) != NULL) { | |
a716c119 | 1062 | int match = xfrm_selector_match(&pol->selector, fl, |
1da177e4 | 1063 | sk->sk_family); |
a716c119 | 1064 | int err = 0; |
df71837d | 1065 | |
3bccfbc7 | 1066 | if (match) { |
03e1ad7b PM |
1067 | err = security_xfrm_policy_lookup(pol->security, |
1068 | fl->secid, | |
1069 | policy_to_flow_dir(dir)); | |
3bccfbc7 VY |
1070 | if (!err) |
1071 | xfrm_pol_hold(pol); | |
1072 | else if (err == -ESRCH) | |
1073 | pol = NULL; | |
1074 | else | |
1075 | pol = ERR_PTR(err); | |
1076 | } else | |
1da177e4 LT |
1077 | pol = NULL; |
1078 | } | |
1079 | read_unlock_bh(&xfrm_policy_lock); | |
1080 | return pol; | |
1081 | } | |
1082 | ||
1083 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) | |
1084 | { | |
2518c7c2 DM |
1085 | struct hlist_head *chain = policy_hash_bysel(&pol->selector, |
1086 | pol->family, dir); | |
4e81bb83 | 1087 | |
12a169e7 | 1088 | list_add(&pol->walk.all, &xfrm_policy_all); |
2518c7c2 DM |
1089 | hlist_add_head(&pol->bydst, chain); |
1090 | hlist_add_head(&pol->byidx, xfrm_policy_byidx+idx_hash(pol->index)); | |
1091 | xfrm_policy_count[dir]++; | |
1da177e4 | 1092 | xfrm_pol_hold(pol); |
2518c7c2 DM |
1093 | |
1094 | if (xfrm_bydst_should_resize(dir, NULL)) | |
1095 | schedule_work(&xfrm_hash_work); | |
1da177e4 LT |
1096 | } |
1097 | ||
1098 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, | |
1099 | int dir) | |
1100 | { | |
2518c7c2 DM |
1101 | if (hlist_unhashed(&pol->bydst)) |
1102 | return NULL; | |
1da177e4 | 1103 | |
2518c7c2 DM |
1104 | hlist_del(&pol->bydst); |
1105 | hlist_del(&pol->byidx); | |
12a169e7 | 1106 | list_del(&pol->walk.all); |
2518c7c2 DM |
1107 | xfrm_policy_count[dir]--; |
1108 | ||
1109 | return pol; | |
1da177e4 LT |
1110 | } |
1111 | ||
4666faab | 1112 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir) |
1da177e4 LT |
1113 | { |
1114 | write_lock_bh(&xfrm_policy_lock); | |
1115 | pol = __xfrm_policy_unlink(pol, dir); | |
1116 | write_unlock_bh(&xfrm_policy_lock); | |
1117 | if (pol) { | |
1118 | if (dir < XFRM_POLICY_MAX) | |
1119 | atomic_inc(&flow_cache_genid); | |
1120 | xfrm_policy_kill(pol); | |
4666faab | 1121 | return 0; |
1da177e4 | 1122 | } |
4666faab | 1123 | return -ENOENT; |
1da177e4 | 1124 | } |
a70fcb0b | 1125 | EXPORT_SYMBOL(xfrm_policy_delete); |
1da177e4 LT |
1126 | |
1127 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) | |
1128 | { | |
1129 | struct xfrm_policy *old_pol; | |
1130 | ||
4e81bb83 MN |
1131 | #ifdef CONFIG_XFRM_SUB_POLICY |
1132 | if (pol && pol->type != XFRM_POLICY_TYPE_MAIN) | |
1133 | return -EINVAL; | |
1134 | #endif | |
1135 | ||
1da177e4 LT |
1136 | write_lock_bh(&xfrm_policy_lock); |
1137 | old_pol = sk->sk_policy[dir]; | |
1138 | sk->sk_policy[dir] = pol; | |
1139 | if (pol) { | |
9d729f72 | 1140 | pol->curlft.add_time = get_seconds(); |
4e81bb83 | 1141 | pol->index = xfrm_gen_index(pol->type, XFRM_POLICY_MAX+dir); |
1da177e4 LT |
1142 | __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir); |
1143 | } | |
1144 | if (old_pol) | |
1145 | __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir); | |
1146 | write_unlock_bh(&xfrm_policy_lock); | |
1147 | ||
1148 | if (old_pol) { | |
1149 | xfrm_policy_kill(old_pol); | |
1150 | } | |
1151 | return 0; | |
1152 | } | |
1153 | ||
1154 | static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir) | |
1155 | { | |
1156 | struct xfrm_policy *newp = xfrm_policy_alloc(GFP_ATOMIC); | |
1157 | ||
1158 | if (newp) { | |
1159 | newp->selector = old->selector; | |
03e1ad7b PM |
1160 | if (security_xfrm_policy_clone(old->security, |
1161 | &newp->security)) { | |
df71837d TJ |
1162 | kfree(newp); |
1163 | return NULL; /* ENOMEM */ | |
1164 | } | |
1da177e4 LT |
1165 | newp->lft = old->lft; |
1166 | newp->curlft = old->curlft; | |
1167 | newp->action = old->action; | |
1168 | newp->flags = old->flags; | |
1169 | newp->xfrm_nr = old->xfrm_nr; | |
1170 | newp->index = old->index; | |
4e81bb83 | 1171 | newp->type = old->type; |
1da177e4 LT |
1172 | memcpy(newp->xfrm_vec, old->xfrm_vec, |
1173 | newp->xfrm_nr*sizeof(struct xfrm_tmpl)); | |
1174 | write_lock_bh(&xfrm_policy_lock); | |
1175 | __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir); | |
1176 | write_unlock_bh(&xfrm_policy_lock); | |
1177 | xfrm_pol_put(newp); | |
1178 | } | |
1179 | return newp; | |
1180 | } | |
1181 | ||
1182 | int __xfrm_sk_clone_policy(struct sock *sk) | |
1183 | { | |
1184 | struct xfrm_policy *p0 = sk->sk_policy[0], | |
1185 | *p1 = sk->sk_policy[1]; | |
1186 | ||
1187 | sk->sk_policy[0] = sk->sk_policy[1] = NULL; | |
1188 | if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL) | |
1189 | return -ENOMEM; | |
1190 | if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL) | |
1191 | return -ENOMEM; | |
1192 | return 0; | |
1193 | } | |
1194 | ||
a1e59abf PM |
1195 | static int |
1196 | xfrm_get_saddr(xfrm_address_t *local, xfrm_address_t *remote, | |
1197 | unsigned short family) | |
1198 | { | |
1199 | int err; | |
1200 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1201 | ||
1202 | if (unlikely(afinfo == NULL)) | |
1203 | return -EINVAL; | |
1204 | err = afinfo->get_saddr(local, remote); | |
1205 | xfrm_policy_put_afinfo(afinfo); | |
1206 | return err; | |
1207 | } | |
1208 | ||
1da177e4 LT |
1209 | /* Resolve list of templates for the flow, given policy. */ |
1210 | ||
1211 | static int | |
4e81bb83 MN |
1212 | xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl, |
1213 | struct xfrm_state **xfrm, | |
1214 | unsigned short family) | |
1da177e4 LT |
1215 | { |
1216 | int nx; | |
1217 | int i, error; | |
1218 | xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); | |
1219 | xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); | |
a1e59abf | 1220 | xfrm_address_t tmp; |
1da177e4 LT |
1221 | |
1222 | for (nx=0, i = 0; i < policy->xfrm_nr; i++) { | |
1223 | struct xfrm_state *x; | |
1224 | xfrm_address_t *remote = daddr; | |
1225 | xfrm_address_t *local = saddr; | |
1226 | struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; | |
1227 | ||
48b8d783 JK |
1228 | if (tmpl->mode == XFRM_MODE_TUNNEL || |
1229 | tmpl->mode == XFRM_MODE_BEET) { | |
1da177e4 LT |
1230 | remote = &tmpl->id.daddr; |
1231 | local = &tmpl->saddr; | |
76b3f055 | 1232 | family = tmpl->encap_family; |
a1e59abf PM |
1233 | if (xfrm_addr_any(local, family)) { |
1234 | error = xfrm_get_saddr(&tmp, remote, family); | |
1235 | if (error) | |
1236 | goto fail; | |
1237 | local = &tmp; | |
1238 | } | |
1da177e4 LT |
1239 | } |
1240 | ||
1241 | x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); | |
1242 | ||
1243 | if (x && x->km.state == XFRM_STATE_VALID) { | |
1244 | xfrm[nx++] = x; | |
1245 | daddr = remote; | |
1246 | saddr = local; | |
1247 | continue; | |
1248 | } | |
1249 | if (x) { | |
1250 | error = (x->km.state == XFRM_STATE_ERROR ? | |
1251 | -EINVAL : -EAGAIN); | |
1252 | xfrm_state_put(x); | |
1253 | } | |
a4322266 | 1254 | else if (error == -ESRCH) |
1255 | error = -EAGAIN; | |
1da177e4 LT |
1256 | |
1257 | if (!tmpl->optional) | |
1258 | goto fail; | |
1259 | } | |
1260 | return nx; | |
1261 | ||
1262 | fail: | |
1263 | for (nx--; nx>=0; nx--) | |
1264 | xfrm_state_put(xfrm[nx]); | |
1265 | return error; | |
1266 | } | |
1267 | ||
4e81bb83 MN |
1268 | static int |
1269 | xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl, | |
1270 | struct xfrm_state **xfrm, | |
1271 | unsigned short family) | |
1272 | { | |
41a49cc3 MN |
1273 | struct xfrm_state *tp[XFRM_MAX_DEPTH]; |
1274 | struct xfrm_state **tpp = (npols > 1) ? tp : xfrm; | |
4e81bb83 MN |
1275 | int cnx = 0; |
1276 | int error; | |
1277 | int ret; | |
1278 | int i; | |
1279 | ||
1280 | for (i = 0; i < npols; i++) { | |
1281 | if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
1282 | error = -ENOBUFS; | |
1283 | goto fail; | |
1284 | } | |
41a49cc3 MN |
1285 | |
1286 | ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family); | |
4e81bb83 MN |
1287 | if (ret < 0) { |
1288 | error = ret; | |
1289 | goto fail; | |
1290 | } else | |
1291 | cnx += ret; | |
1292 | } | |
1293 | ||
41a49cc3 MN |
1294 | /* found states are sorted for outbound processing */ |
1295 | if (npols > 1) | |
1296 | xfrm_state_sort(xfrm, tpp, cnx, family); | |
1297 | ||
4e81bb83 MN |
1298 | return cnx; |
1299 | ||
1300 | fail: | |
1301 | for (cnx--; cnx>=0; cnx--) | |
41a49cc3 | 1302 | xfrm_state_put(tpp[cnx]); |
4e81bb83 MN |
1303 | return error; |
1304 | ||
1305 | } | |
1306 | ||
1da177e4 LT |
1307 | /* Check that the bundle accepts the flow and its components are |
1308 | * still valid. | |
1309 | */ | |
1310 | ||
1311 | static struct dst_entry * | |
1312 | xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short family) | |
1313 | { | |
1314 | struct dst_entry *x; | |
1315 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1316 | if (unlikely(afinfo == NULL)) | |
1317 | return ERR_PTR(-EINVAL); | |
1318 | x = afinfo->find_bundle(fl, policy); | |
1319 | xfrm_policy_put_afinfo(afinfo); | |
1320 | return x; | |
1321 | } | |
1322 | ||
25ee3286 HX |
1323 | static inline int xfrm_get_tos(struct flowi *fl, int family) |
1324 | { | |
1325 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1326 | int tos; | |
1da177e4 | 1327 | |
25ee3286 HX |
1328 | if (!afinfo) |
1329 | return -EINVAL; | |
1330 | ||
1331 | tos = afinfo->get_tos(fl); | |
1332 | ||
1333 | xfrm_policy_put_afinfo(afinfo); | |
1334 | ||
1335 | return tos; | |
1336 | } | |
1337 | ||
1338 | static inline struct xfrm_dst *xfrm_alloc_dst(int family) | |
1da177e4 | 1339 | { |
1da177e4 | 1340 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
25ee3286 HX |
1341 | struct xfrm_dst *xdst; |
1342 | ||
1343 | if (!afinfo) | |
1344 | return ERR_PTR(-EINVAL); | |
1345 | ||
1346 | xdst = dst_alloc(afinfo->dst_ops) ?: ERR_PTR(-ENOBUFS); | |
1347 | ||
1348 | xfrm_policy_put_afinfo(afinfo); | |
1349 | ||
1350 | return xdst; | |
1351 | } | |
1352 | ||
a1b05140 MN |
1353 | static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst, |
1354 | int nfheader_len) | |
1355 | { | |
1356 | struct xfrm_policy_afinfo *afinfo = | |
1357 | xfrm_policy_get_afinfo(dst->ops->family); | |
1358 | int err; | |
1359 | ||
1360 | if (!afinfo) | |
1361 | return -EINVAL; | |
1362 | ||
1363 | err = afinfo->init_path(path, dst, nfheader_len); | |
1364 | ||
1365 | xfrm_policy_put_afinfo(afinfo); | |
1366 | ||
1367 | return err; | |
1368 | } | |
1369 | ||
25ee3286 HX |
1370 | static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev) |
1371 | { | |
1372 | struct xfrm_policy_afinfo *afinfo = | |
1373 | xfrm_policy_get_afinfo(xdst->u.dst.ops->family); | |
1374 | int err; | |
1375 | ||
1376 | if (!afinfo) | |
1da177e4 | 1377 | return -EINVAL; |
25ee3286 HX |
1378 | |
1379 | err = afinfo->fill_dst(xdst, dev); | |
1380 | ||
1da177e4 | 1381 | xfrm_policy_put_afinfo(afinfo); |
25ee3286 | 1382 | |
1da177e4 LT |
1383 | return err; |
1384 | } | |
1385 | ||
25ee3286 HX |
1386 | /* Allocate chain of dst_entry's, attach known xfrm's, calculate |
1387 | * all the metrics... Shortly, bundle a bundle. | |
1388 | */ | |
1389 | ||
1390 | static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy, | |
1391 | struct xfrm_state **xfrm, int nx, | |
1392 | struct flowi *fl, | |
1393 | struct dst_entry *dst) | |
1394 | { | |
1395 | unsigned long now = jiffies; | |
1396 | struct net_device *dev; | |
1397 | struct dst_entry *dst_prev = NULL; | |
1398 | struct dst_entry *dst0 = NULL; | |
1399 | int i = 0; | |
1400 | int err; | |
1401 | int header_len = 0; | |
a1b05140 | 1402 | int nfheader_len = 0; |
25ee3286 HX |
1403 | int trailer_len = 0; |
1404 | int tos; | |
1405 | int family = policy->selector.family; | |
9bb182a7 YH |
1406 | xfrm_address_t saddr, daddr; |
1407 | ||
1408 | xfrm_flowi_addr_get(fl, &saddr, &daddr, family); | |
25ee3286 HX |
1409 | |
1410 | tos = xfrm_get_tos(fl, family); | |
1411 | err = tos; | |
1412 | if (tos < 0) | |
1413 | goto put_states; | |
1414 | ||
1415 | dst_hold(dst); | |
1416 | ||
1417 | for (; i < nx; i++) { | |
1418 | struct xfrm_dst *xdst = xfrm_alloc_dst(family); | |
1419 | struct dst_entry *dst1 = &xdst->u.dst; | |
1420 | ||
1421 | err = PTR_ERR(xdst); | |
1422 | if (IS_ERR(xdst)) { | |
1423 | dst_release(dst); | |
1424 | goto put_states; | |
1425 | } | |
1426 | ||
1427 | if (!dst_prev) | |
1428 | dst0 = dst1; | |
1429 | else { | |
1430 | dst_prev->child = dst_clone(dst1); | |
1431 | dst1->flags |= DST_NOHASH; | |
1432 | } | |
1433 | ||
1434 | xdst->route = dst; | |
1435 | memcpy(&dst1->metrics, &dst->metrics, sizeof(dst->metrics)); | |
1436 | ||
1437 | if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) { | |
1438 | family = xfrm[i]->props.family; | |
9bb182a7 YH |
1439 | dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr, |
1440 | family); | |
25ee3286 HX |
1441 | err = PTR_ERR(dst); |
1442 | if (IS_ERR(dst)) | |
1443 | goto put_states; | |
1444 | } else | |
1445 | dst_hold(dst); | |
1446 | ||
1447 | dst1->xfrm = xfrm[i]; | |
1448 | xdst->genid = xfrm[i]->genid; | |
1449 | ||
1450 | dst1->obsolete = -1; | |
1451 | dst1->flags |= DST_HOST; | |
1452 | dst1->lastuse = now; | |
1453 | ||
1454 | dst1->input = dst_discard; | |
1455 | dst1->output = xfrm[i]->outer_mode->afinfo->output; | |
1456 | ||
1457 | dst1->next = dst_prev; | |
1458 | dst_prev = dst1; | |
1459 | ||
1460 | header_len += xfrm[i]->props.header_len; | |
a1b05140 MN |
1461 | if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT) |
1462 | nfheader_len += xfrm[i]->props.header_len; | |
25ee3286 HX |
1463 | trailer_len += xfrm[i]->props.trailer_len; |
1464 | } | |
1465 | ||
1466 | dst_prev->child = dst; | |
1467 | dst0->path = dst; | |
1468 | ||
1469 | err = -ENODEV; | |
1470 | dev = dst->dev; | |
1471 | if (!dev) | |
1472 | goto free_dst; | |
1473 | ||
1474 | /* Copy neighbout for reachability confirmation */ | |
1475 | dst0->neighbour = neigh_clone(dst->neighbour); | |
1476 | ||
a1b05140 | 1477 | xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len); |
25ee3286 HX |
1478 | xfrm_init_pmtu(dst_prev); |
1479 | ||
1480 | for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) { | |
1481 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev; | |
1482 | ||
1483 | err = xfrm_fill_dst(xdst, dev); | |
1484 | if (err) | |
1485 | goto free_dst; | |
1486 | ||
1487 | dst_prev->header_len = header_len; | |
1488 | dst_prev->trailer_len = trailer_len; | |
1489 | header_len -= xdst->u.dst.xfrm->props.header_len; | |
1490 | trailer_len -= xdst->u.dst.xfrm->props.trailer_len; | |
1491 | } | |
1492 | ||
1493 | out: | |
1494 | return dst0; | |
1495 | ||
1496 | put_states: | |
1497 | for (; i < nx; i++) | |
1498 | xfrm_state_put(xfrm[i]); | |
1499 | free_dst: | |
1500 | if (dst0) | |
1501 | dst_free(dst0); | |
1502 | dst0 = ERR_PTR(err); | |
1503 | goto out; | |
1504 | } | |
1505 | ||
157bfc25 MN |
1506 | static int inline |
1507 | xfrm_dst_alloc_copy(void **target, void *src, int size) | |
1508 | { | |
1509 | if (!*target) { | |
1510 | *target = kmalloc(size, GFP_ATOMIC); | |
1511 | if (!*target) | |
1512 | return -ENOMEM; | |
1513 | } | |
1514 | memcpy(*target, src, size); | |
1515 | return 0; | |
1516 | } | |
1517 | ||
1518 | static int inline | |
1519 | xfrm_dst_update_parent(struct dst_entry *dst, struct xfrm_selector *sel) | |
1520 | { | |
1521 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1522 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1523 | return xfrm_dst_alloc_copy((void **)&(xdst->partner), | |
1524 | sel, sizeof(*sel)); | |
1525 | #else | |
1526 | return 0; | |
1527 | #endif | |
1528 | } | |
1529 | ||
1530 | static int inline | |
1531 | xfrm_dst_update_origin(struct dst_entry *dst, struct flowi *fl) | |
1532 | { | |
1533 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1534 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1535 | return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl)); | |
1536 | #else | |
1537 | return 0; | |
1538 | #endif | |
1539 | } | |
1da177e4 LT |
1540 | |
1541 | static int stale_bundle(struct dst_entry *dst); | |
1542 | ||
1543 | /* Main function: finds/creates a bundle for given flow. | |
1544 | * | |
1545 | * At the moment we eat a raw IP route. Mostly to speed up lookups | |
1546 | * on interfaces with disabled IPsec. | |
1547 | */ | |
14e50e57 DM |
1548 | int __xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl, |
1549 | struct sock *sk, int flags) | |
1da177e4 LT |
1550 | { |
1551 | struct xfrm_policy *policy; | |
4e81bb83 MN |
1552 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
1553 | int npols; | |
1554 | int pol_dead; | |
1555 | int xfrm_nr; | |
1556 | int pi; | |
1da177e4 LT |
1557 | struct xfrm_state *xfrm[XFRM_MAX_DEPTH]; |
1558 | struct dst_entry *dst, *dst_orig = *dst_p; | |
1559 | int nx = 0; | |
1560 | int err; | |
1561 | u32 genid; | |
42cf93cd | 1562 | u16 family; |
df71837d | 1563 | u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT); |
e0d1caa7 | 1564 | |
1da177e4 LT |
1565 | restart: |
1566 | genid = atomic_read(&flow_cache_genid); | |
1567 | policy = NULL; | |
4e81bb83 MN |
1568 | for (pi = 0; pi < ARRAY_SIZE(pols); pi++) |
1569 | pols[pi] = NULL; | |
1570 | npols = 0; | |
1571 | pol_dead = 0; | |
1572 | xfrm_nr = 0; | |
1573 | ||
f7944fb1 | 1574 | if (sk && sk->sk_policy[XFRM_POLICY_OUT]) { |
e0d1caa7 | 1575 | policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl); |
75b8c133 | 1576 | err = PTR_ERR(policy); |
0aa64774 MN |
1577 | if (IS_ERR(policy)) { |
1578 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLERROR); | |
75b8c133 | 1579 | goto dropdst; |
0aa64774 | 1580 | } |
3bccfbc7 | 1581 | } |
1da177e4 LT |
1582 | |
1583 | if (!policy) { | |
1584 | /* To accelerate a bit... */ | |
2518c7c2 DM |
1585 | if ((dst_orig->flags & DST_NOXFRM) || |
1586 | !xfrm_policy_count[XFRM_POLICY_OUT]) | |
8b7817f3 | 1587 | goto nopol; |
1da177e4 | 1588 | |
e0d1caa7 | 1589 | policy = flow_cache_lookup(fl, dst_orig->ops->family, |
42cf93cd | 1590 | dir, xfrm_policy_lookup); |
75b8c133 | 1591 | err = PTR_ERR(policy); |
d66e37a9 MN |
1592 | if (IS_ERR(policy)) { |
1593 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLERROR); | |
75b8c133 | 1594 | goto dropdst; |
d66e37a9 | 1595 | } |
1da177e4 LT |
1596 | } |
1597 | ||
1598 | if (!policy) | |
8b7817f3 | 1599 | goto nopol; |
1da177e4 | 1600 | |
42cf93cd | 1601 | family = dst_orig->ops->family; |
4e81bb83 MN |
1602 | pols[0] = policy; |
1603 | npols ++; | |
1604 | xfrm_nr += pols[0]->xfrm_nr; | |
1da177e4 | 1605 | |
aef21785 | 1606 | err = -ENOENT; |
8b7817f3 HX |
1607 | if ((flags & XFRM_LOOKUP_ICMP) && !(policy->flags & XFRM_POLICY_ICMP)) |
1608 | goto error; | |
1609 | ||
1610 | policy->curlft.use_time = get_seconds(); | |
1611 | ||
1da177e4 | 1612 | switch (policy->action) { |
5e5234ff | 1613 | default: |
1da177e4 LT |
1614 | case XFRM_POLICY_BLOCK: |
1615 | /* Prohibit the flow */ | |
0aa64774 | 1616 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLBLOCK); |
e104411b PM |
1617 | err = -EPERM; |
1618 | goto error; | |
1da177e4 LT |
1619 | |
1620 | case XFRM_POLICY_ALLOW: | |
4e81bb83 | 1621 | #ifndef CONFIG_XFRM_SUB_POLICY |
1da177e4 LT |
1622 | if (policy->xfrm_nr == 0) { |
1623 | /* Flow passes not transformed. */ | |
1624 | xfrm_pol_put(policy); | |
1625 | return 0; | |
1626 | } | |
4e81bb83 | 1627 | #endif |
1da177e4 LT |
1628 | |
1629 | /* Try to find matching bundle. | |
1630 | * | |
1631 | * LATER: help from flow cache. It is optional, this | |
1632 | * is required only for output policy. | |
1633 | */ | |
1634 | dst = xfrm_find_bundle(fl, policy, family); | |
1635 | if (IS_ERR(dst)) { | |
0aa64774 | 1636 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR); |
e104411b PM |
1637 | err = PTR_ERR(dst); |
1638 | goto error; | |
1da177e4 LT |
1639 | } |
1640 | ||
1641 | if (dst) | |
1642 | break; | |
1643 | ||
4e81bb83 MN |
1644 | #ifdef CONFIG_XFRM_SUB_POLICY |
1645 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1646 | pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, | |
1647 | fl, family, | |
1648 | XFRM_POLICY_OUT); | |
1649 | if (pols[1]) { | |
134b0fc5 | 1650 | if (IS_ERR(pols[1])) { |
0aa64774 | 1651 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLERROR); |
134b0fc5 JM |
1652 | err = PTR_ERR(pols[1]); |
1653 | goto error; | |
1654 | } | |
4e81bb83 | 1655 | if (pols[1]->action == XFRM_POLICY_BLOCK) { |
0aa64774 | 1656 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLBLOCK); |
4e81bb83 MN |
1657 | err = -EPERM; |
1658 | goto error; | |
1659 | } | |
1660 | npols ++; | |
1661 | xfrm_nr += pols[1]->xfrm_nr; | |
1662 | } | |
1663 | } | |
1664 | ||
1665 | /* | |
1666 | * Because neither flowi nor bundle information knows about | |
1667 | * transformation template size. On more than one policy usage | |
1668 | * we can realize whether all of them is bypass or not after | |
1669 | * they are searched. See above not-transformed bypass | |
1670 | * is surrounded by non-sub policy configuration, too. | |
1671 | */ | |
1672 | if (xfrm_nr == 0) { | |
1673 | /* Flow passes not transformed. */ | |
1674 | xfrm_pols_put(pols, npols); | |
1675 | return 0; | |
1676 | } | |
1677 | ||
1678 | #endif | |
1679 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); | |
1da177e4 LT |
1680 | |
1681 | if (unlikely(nx<0)) { | |
1682 | err = nx; | |
14e50e57 DM |
1683 | if (err == -EAGAIN && sysctl_xfrm_larval_drop) { |
1684 | /* EREMOTE tells the caller to generate | |
1685 | * a one-shot blackhole route. | |
1686 | */ | |
d66e37a9 | 1687 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES); |
14e50e57 DM |
1688 | xfrm_pol_put(policy); |
1689 | return -EREMOTE; | |
1690 | } | |
815f4e57 | 1691 | if (err == -EAGAIN && (flags & XFRM_LOOKUP_WAIT)) { |
1da177e4 LT |
1692 | DECLARE_WAITQUEUE(wait, current); |
1693 | ||
1694 | add_wait_queue(&km_waitq, &wait); | |
1695 | set_current_state(TASK_INTERRUPTIBLE); | |
1696 | schedule(); | |
1697 | set_current_state(TASK_RUNNING); | |
1698 | remove_wait_queue(&km_waitq, &wait); | |
1699 | ||
4e81bb83 | 1700 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); |
1da177e4 LT |
1701 | |
1702 | if (nx == -EAGAIN && signal_pending(current)) { | |
0aa64774 | 1703 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES); |
1da177e4 LT |
1704 | err = -ERESTART; |
1705 | goto error; | |
1706 | } | |
1707 | if (nx == -EAGAIN || | |
1708 | genid != atomic_read(&flow_cache_genid)) { | |
4e81bb83 | 1709 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1710 | goto restart; |
1711 | } | |
1712 | err = nx; | |
1713 | } | |
0aa64774 MN |
1714 | if (err < 0) { |
1715 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES); | |
1da177e4 | 1716 | goto error; |
0aa64774 | 1717 | } |
1da177e4 LT |
1718 | } |
1719 | if (nx == 0) { | |
1720 | /* Flow passes not transformed. */ | |
4e81bb83 | 1721 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1722 | return 0; |
1723 | } | |
1724 | ||
25ee3286 HX |
1725 | dst = xfrm_bundle_create(policy, xfrm, nx, fl, dst_orig); |
1726 | err = PTR_ERR(dst); | |
0aa64774 MN |
1727 | if (IS_ERR(dst)) { |
1728 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLEGENERROR); | |
1da177e4 | 1729 | goto error; |
0aa64774 | 1730 | } |
1da177e4 | 1731 | |
4e81bb83 MN |
1732 | for (pi = 0; pi < npols; pi++) { |
1733 | read_lock_bh(&pols[pi]->lock); | |
12a169e7 | 1734 | pol_dead |= pols[pi]->walk.dead; |
4e81bb83 MN |
1735 | read_unlock_bh(&pols[pi]->lock); |
1736 | } | |
1737 | ||
1da177e4 | 1738 | write_lock_bh(&policy->lock); |
4e81bb83 | 1739 | if (unlikely(pol_dead || stale_bundle(dst))) { |
1da177e4 LT |
1740 | /* Wow! While we worked on resolving, this |
1741 | * policy has gone. Retry. It is not paranoia, | |
1742 | * we just cannot enlist new bundle to dead object. | |
1743 | * We can't enlist stable bundles either. | |
1744 | */ | |
1745 | write_unlock_bh(&policy->lock); | |
9d7d7402 | 1746 | dst_free(dst); |
00de651d | 1747 | |
0aa64774 MN |
1748 | if (pol_dead) |
1749 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLDEAD); | |
1750 | else | |
1751 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR); | |
00de651d HX |
1752 | err = -EHOSTUNREACH; |
1753 | goto error; | |
1da177e4 | 1754 | } |
157bfc25 MN |
1755 | |
1756 | if (npols > 1) | |
1757 | err = xfrm_dst_update_parent(dst, &pols[1]->selector); | |
1758 | else | |
1759 | err = xfrm_dst_update_origin(dst, fl); | |
1760 | if (unlikely(err)) { | |
1761 | write_unlock_bh(&policy->lock); | |
9d7d7402 | 1762 | dst_free(dst); |
0aa64774 | 1763 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR); |
157bfc25 MN |
1764 | goto error; |
1765 | } | |
1766 | ||
1da177e4 LT |
1767 | dst->next = policy->bundles; |
1768 | policy->bundles = dst; | |
1769 | dst_hold(dst); | |
1770 | write_unlock_bh(&policy->lock); | |
1771 | } | |
1772 | *dst_p = dst; | |
1773 | dst_release(dst_orig); | |
a716c119 | 1774 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1775 | return 0; |
1776 | ||
1777 | error: | |
4e81bb83 | 1778 | xfrm_pols_put(pols, npols); |
75b8c133 HX |
1779 | dropdst: |
1780 | dst_release(dst_orig); | |
1da177e4 LT |
1781 | *dst_p = NULL; |
1782 | return err; | |
8b7817f3 HX |
1783 | |
1784 | nopol: | |
aef21785 | 1785 | err = -ENOENT; |
8b7817f3 HX |
1786 | if (flags & XFRM_LOOKUP_ICMP) |
1787 | goto dropdst; | |
1788 | return 0; | |
1da177e4 | 1789 | } |
14e50e57 DM |
1790 | EXPORT_SYMBOL(__xfrm_lookup); |
1791 | ||
1792 | int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl, | |
1793 | struct sock *sk, int flags) | |
1794 | { | |
1795 | int err = __xfrm_lookup(dst_p, fl, sk, flags); | |
1796 | ||
1797 | if (err == -EREMOTE) { | |
1798 | dst_release(*dst_p); | |
1799 | *dst_p = NULL; | |
1800 | err = -EAGAIN; | |
1801 | } | |
1802 | ||
1803 | return err; | |
1804 | } | |
1da177e4 LT |
1805 | EXPORT_SYMBOL(xfrm_lookup); |
1806 | ||
df0ba92a MN |
1807 | static inline int |
1808 | xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl) | |
1809 | { | |
1810 | struct xfrm_state *x; | |
df0ba92a MN |
1811 | |
1812 | if (!skb->sp || idx < 0 || idx >= skb->sp->len) | |
1813 | return 0; | |
1814 | x = skb->sp->xvec[idx]; | |
1815 | if (!x->type->reject) | |
1816 | return 0; | |
1ecafede | 1817 | return x->type->reject(x, skb, fl); |
df0ba92a MN |
1818 | } |
1819 | ||
1da177e4 LT |
1820 | /* When skb is transformed back to its "native" form, we have to |
1821 | * check policy restrictions. At the moment we make this in maximally | |
1822 | * stupid way. Shame on me. :-) Of course, connected sockets must | |
1823 | * have policy cached at them. | |
1824 | */ | |
1825 | ||
1826 | static inline int | |
a716c119 | 1827 | xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x, |
1da177e4 LT |
1828 | unsigned short family) |
1829 | { | |
1830 | if (xfrm_state_kern(x)) | |
928ba416 | 1831 | return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family); |
1da177e4 LT |
1832 | return x->id.proto == tmpl->id.proto && |
1833 | (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && | |
1834 | (x->props.reqid == tmpl->reqid || !tmpl->reqid) && | |
1835 | x->props.mode == tmpl->mode && | |
c5d18e98 | 1836 | (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) || |
f3bd4840 | 1837 | !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) && |
7e49e6de MN |
1838 | !(x->props.mode != XFRM_MODE_TRANSPORT && |
1839 | xfrm_state_addr_cmp(tmpl, x, family)); | |
1da177e4 LT |
1840 | } |
1841 | ||
df0ba92a MN |
1842 | /* |
1843 | * 0 or more than 0 is returned when validation is succeeded (either bypass | |
1844 | * because of optional transport mode, or next index of the mathced secpath | |
1845 | * state with the template. | |
1846 | * -1 is returned when no matching template is found. | |
1847 | * Otherwise "-2 - errored_index" is returned. | |
1848 | */ | |
1da177e4 LT |
1849 | static inline int |
1850 | xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start, | |
1851 | unsigned short family) | |
1852 | { | |
1853 | int idx = start; | |
1854 | ||
1855 | if (tmpl->optional) { | |
7e49e6de | 1856 | if (tmpl->mode == XFRM_MODE_TRANSPORT) |
1da177e4 LT |
1857 | return start; |
1858 | } else | |
1859 | start = -1; | |
1860 | for (; idx < sp->len; idx++) { | |
dbe5b4aa | 1861 | if (xfrm_state_ok(tmpl, sp->xvec[idx], family)) |
1da177e4 | 1862 | return ++idx; |
df0ba92a MN |
1863 | if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) { |
1864 | if (start == -1) | |
1865 | start = -2-idx; | |
1da177e4 | 1866 | break; |
df0ba92a | 1867 | } |
1da177e4 LT |
1868 | } |
1869 | return start; | |
1870 | } | |
1871 | ||
d5422efe HX |
1872 | int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, |
1873 | unsigned int family, int reverse) | |
1da177e4 LT |
1874 | { |
1875 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
e0d1caa7 | 1876 | int err; |
1da177e4 LT |
1877 | |
1878 | if (unlikely(afinfo == NULL)) | |
1879 | return -EAFNOSUPPORT; | |
1880 | ||
d5422efe | 1881 | afinfo->decode_session(skb, fl, reverse); |
beb8d13b | 1882 | err = security_xfrm_decode_session(skb, &fl->secid); |
1da177e4 | 1883 | xfrm_policy_put_afinfo(afinfo); |
e0d1caa7 | 1884 | return err; |
1da177e4 | 1885 | } |
d5422efe | 1886 | EXPORT_SYMBOL(__xfrm_decode_session); |
1da177e4 | 1887 | |
df0ba92a | 1888 | static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp) |
1da177e4 LT |
1889 | { |
1890 | for (; k < sp->len; k++) { | |
df0ba92a | 1891 | if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) { |
d1d9facf | 1892 | *idxp = k; |
1da177e4 | 1893 | return 1; |
df0ba92a | 1894 | } |
1da177e4 LT |
1895 | } |
1896 | ||
1897 | return 0; | |
1898 | } | |
1899 | ||
a716c119 | 1900 | int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, |
1da177e4 LT |
1901 | unsigned short family) |
1902 | { | |
1903 | struct xfrm_policy *pol; | |
4e81bb83 MN |
1904 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
1905 | int npols = 0; | |
1906 | int xfrm_nr; | |
1907 | int pi; | |
d5422efe | 1908 | int reverse; |
1da177e4 | 1909 | struct flowi fl; |
d5422efe | 1910 | u8 fl_dir; |
df0ba92a | 1911 | int xerr_idx = -1; |
1da177e4 | 1912 | |
d5422efe HX |
1913 | reverse = dir & ~XFRM_POLICY_MASK; |
1914 | dir &= XFRM_POLICY_MASK; | |
1915 | fl_dir = policy_to_flow_dir(dir); | |
1916 | ||
0aa64774 MN |
1917 | if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) { |
1918 | XFRM_INC_STATS(LINUX_MIB_XFRMINHDRERROR); | |
1da177e4 | 1919 | return 0; |
0aa64774 MN |
1920 | } |
1921 | ||
eb9c7ebe | 1922 | nf_nat_decode_session(skb, &fl, family); |
1da177e4 LT |
1923 | |
1924 | /* First, check used SA against their selectors. */ | |
1925 | if (skb->sp) { | |
1926 | int i; | |
1927 | ||
1928 | for (i=skb->sp->len-1; i>=0; i--) { | |
dbe5b4aa | 1929 | struct xfrm_state *x = skb->sp->xvec[i]; |
0aa64774 MN |
1930 | if (!xfrm_selector_match(&x->sel, &fl, family)) { |
1931 | XFRM_INC_STATS(LINUX_MIB_XFRMINSTATEMISMATCH); | |
1da177e4 | 1932 | return 0; |
0aa64774 | 1933 | } |
1da177e4 LT |
1934 | } |
1935 | } | |
1936 | ||
1937 | pol = NULL; | |
3bccfbc7 | 1938 | if (sk && sk->sk_policy[dir]) { |
e0d1caa7 | 1939 | pol = xfrm_sk_policy_lookup(sk, dir, &fl); |
0aa64774 MN |
1940 | if (IS_ERR(pol)) { |
1941 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR); | |
3bccfbc7 | 1942 | return 0; |
0aa64774 | 1943 | } |
3bccfbc7 | 1944 | } |
1da177e4 LT |
1945 | |
1946 | if (!pol) | |
e0d1caa7 | 1947 | pol = flow_cache_lookup(&fl, family, fl_dir, |
1da177e4 LT |
1948 | xfrm_policy_lookup); |
1949 | ||
0aa64774 MN |
1950 | if (IS_ERR(pol)) { |
1951 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR); | |
134b0fc5 | 1952 | return 0; |
0aa64774 | 1953 | } |
134b0fc5 | 1954 | |
df0ba92a | 1955 | if (!pol) { |
d1d9facf | 1956 | if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) { |
df0ba92a | 1957 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
0aa64774 | 1958 | XFRM_INC_STATS(LINUX_MIB_XFRMINNOPOLS); |
df0ba92a MN |
1959 | return 0; |
1960 | } | |
1961 | return 1; | |
1962 | } | |
1da177e4 | 1963 | |
9d729f72 | 1964 | pol->curlft.use_time = get_seconds(); |
1da177e4 | 1965 | |
4e81bb83 MN |
1966 | pols[0] = pol; |
1967 | npols ++; | |
1968 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1969 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1970 | pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, | |
1971 | &fl, family, | |
1972 | XFRM_POLICY_IN); | |
1973 | if (pols[1]) { | |
0aa64774 MN |
1974 | if (IS_ERR(pols[1])) { |
1975 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR); | |
134b0fc5 | 1976 | return 0; |
0aa64774 | 1977 | } |
9d729f72 | 1978 | pols[1]->curlft.use_time = get_seconds(); |
4e81bb83 MN |
1979 | npols ++; |
1980 | } | |
1981 | } | |
1982 | #endif | |
1983 | ||
1da177e4 LT |
1984 | if (pol->action == XFRM_POLICY_ALLOW) { |
1985 | struct sec_path *sp; | |
1986 | static struct sec_path dummy; | |
4e81bb83 | 1987 | struct xfrm_tmpl *tp[XFRM_MAX_DEPTH]; |
41a49cc3 | 1988 | struct xfrm_tmpl *stp[XFRM_MAX_DEPTH]; |
4e81bb83 MN |
1989 | struct xfrm_tmpl **tpp = tp; |
1990 | int ti = 0; | |
1da177e4 LT |
1991 | int i, k; |
1992 | ||
1993 | if ((sp = skb->sp) == NULL) | |
1994 | sp = &dummy; | |
1995 | ||
4e81bb83 MN |
1996 | for (pi = 0; pi < npols; pi++) { |
1997 | if (pols[pi] != pol && | |
0aa64774 MN |
1998 | pols[pi]->action != XFRM_POLICY_ALLOW) { |
1999 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLBLOCK); | |
4e81bb83 | 2000 | goto reject; |
0aa64774 MN |
2001 | } |
2002 | if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
2003 | XFRM_INC_STATS(LINUX_MIB_XFRMINBUFFERERROR); | |
4e81bb83 | 2004 | goto reject_error; |
0aa64774 | 2005 | } |
4e81bb83 MN |
2006 | for (i = 0; i < pols[pi]->xfrm_nr; i++) |
2007 | tpp[ti++] = &pols[pi]->xfrm_vec[i]; | |
2008 | } | |
2009 | xfrm_nr = ti; | |
41a49cc3 MN |
2010 | if (npols > 1) { |
2011 | xfrm_tmpl_sort(stp, tpp, xfrm_nr, family); | |
2012 | tpp = stp; | |
2013 | } | |
4e81bb83 | 2014 | |
1da177e4 LT |
2015 | /* For each tunnel xfrm, find the first matching tmpl. |
2016 | * For each tmpl before that, find corresponding xfrm. | |
2017 | * Order is _important_. Later we will implement | |
2018 | * some barriers, but at the moment barriers | |
2019 | * are implied between each two transformations. | |
2020 | */ | |
4e81bb83 MN |
2021 | for (i = xfrm_nr-1, k = 0; i >= 0; i--) { |
2022 | k = xfrm_policy_ok(tpp[i], sp, k, family); | |
df0ba92a | 2023 | if (k < 0) { |
d1d9facf JM |
2024 | if (k < -1) |
2025 | /* "-2 - errored_index" returned */ | |
2026 | xerr_idx = -(2+k); | |
0aa64774 | 2027 | XFRM_INC_STATS(LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 2028 | goto reject; |
df0ba92a | 2029 | } |
1da177e4 LT |
2030 | } |
2031 | ||
0aa64774 MN |
2032 | if (secpath_has_nontransport(sp, k, &xerr_idx)) { |
2033 | XFRM_INC_STATS(LINUX_MIB_XFRMINTMPLMISMATCH); | |
1da177e4 | 2034 | goto reject; |
0aa64774 | 2035 | } |
1da177e4 | 2036 | |
4e81bb83 | 2037 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
2038 | return 1; |
2039 | } | |
0aa64774 | 2040 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLBLOCK); |
1da177e4 LT |
2041 | |
2042 | reject: | |
df0ba92a | 2043 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
4e81bb83 MN |
2044 | reject_error: |
2045 | xfrm_pols_put(pols, npols); | |
1da177e4 LT |
2046 | return 0; |
2047 | } | |
2048 | EXPORT_SYMBOL(__xfrm_policy_check); | |
2049 | ||
2050 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
2051 | { | |
2052 | struct flowi fl; | |
2053 | ||
0aa64774 MN |
2054 | if (xfrm_decode_session(skb, &fl, family) < 0) { |
2055 | /* XXX: we should have something like FWDHDRERROR here. */ | |
2056 | XFRM_INC_STATS(LINUX_MIB_XFRMINHDRERROR); | |
1da177e4 | 2057 | return 0; |
0aa64774 | 2058 | } |
1da177e4 LT |
2059 | |
2060 | return xfrm_lookup(&skb->dst, &fl, NULL, 0) == 0; | |
2061 | } | |
2062 | EXPORT_SYMBOL(__xfrm_route_forward); | |
2063 | ||
d49c73c7 DM |
2064 | /* Optimize later using cookies and generation ids. */ |
2065 | ||
1da177e4 LT |
2066 | static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) |
2067 | { | |
d49c73c7 DM |
2068 | /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete |
2069 | * to "-1" to force all XFRM destinations to get validated by | |
2070 | * dst_ops->check on every use. We do this because when a | |
2071 | * normal route referenced by an XFRM dst is obsoleted we do | |
2072 | * not go looking around for all parent referencing XFRM dsts | |
2073 | * so that we can invalidate them. It is just too much work. | |
2074 | * Instead we make the checks here on every use. For example: | |
2075 | * | |
2076 | * XFRM dst A --> IPv4 dst X | |
2077 | * | |
2078 | * X is the "xdst->route" of A (X is also the "dst->path" of A | |
2079 | * in this example). If X is marked obsolete, "A" will not | |
2080 | * notice. That's what we are validating here via the | |
2081 | * stale_bundle() check. | |
2082 | * | |
2083 | * When a policy's bundle is pruned, we dst_free() the XFRM | |
2084 | * dst which causes it's ->obsolete field to be set to a | |
2085 | * positive non-zero integer. If an XFRM dst has been pruned | |
2086 | * like this, we want to force a new route lookup. | |
399c180a | 2087 | */ |
d49c73c7 DM |
2088 | if (dst->obsolete < 0 && !stale_bundle(dst)) |
2089 | return dst; | |
2090 | ||
1da177e4 LT |
2091 | return NULL; |
2092 | } | |
2093 | ||
2094 | static int stale_bundle(struct dst_entry *dst) | |
2095 | { | |
5b368e61 | 2096 | return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0); |
1da177e4 LT |
2097 | } |
2098 | ||
aabc9761 | 2099 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
1da177e4 | 2100 | { |
1da177e4 | 2101 | while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { |
c346dca1 | 2102 | dst->dev = dev_net(dev)->loopback_dev; |
de3cb747 | 2103 | dev_hold(dst->dev); |
1da177e4 LT |
2104 | dev_put(dev); |
2105 | } | |
2106 | } | |
aabc9761 | 2107 | EXPORT_SYMBOL(xfrm_dst_ifdown); |
1da177e4 LT |
2108 | |
2109 | static void xfrm_link_failure(struct sk_buff *skb) | |
2110 | { | |
2111 | /* Impossible. Such dst must be popped before reaches point of failure. */ | |
2112 | return; | |
2113 | } | |
2114 | ||
2115 | static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) | |
2116 | { | |
2117 | if (dst) { | |
2118 | if (dst->obsolete) { | |
2119 | dst_release(dst); | |
2120 | dst = NULL; | |
2121 | } | |
2122 | } | |
2123 | return dst; | |
2124 | } | |
2125 | ||
2518c7c2 DM |
2126 | static void prune_one_bundle(struct xfrm_policy *pol, int (*func)(struct dst_entry *), struct dst_entry **gc_list_p) |
2127 | { | |
2128 | struct dst_entry *dst, **dstp; | |
2129 | ||
2130 | write_lock(&pol->lock); | |
2131 | dstp = &pol->bundles; | |
2132 | while ((dst=*dstp) != NULL) { | |
2133 | if (func(dst)) { | |
2134 | *dstp = dst->next; | |
2135 | dst->next = *gc_list_p; | |
2136 | *gc_list_p = dst; | |
2137 | } else { | |
2138 | dstp = &dst->next; | |
2139 | } | |
2140 | } | |
2141 | write_unlock(&pol->lock); | |
2142 | } | |
2143 | ||
1da177e4 LT |
2144 | static void xfrm_prune_bundles(int (*func)(struct dst_entry *)) |
2145 | { | |
2518c7c2 DM |
2146 | struct dst_entry *gc_list = NULL; |
2147 | int dir; | |
1da177e4 LT |
2148 | |
2149 | read_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
2150 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
2151 | struct xfrm_policy *pol; | |
2152 | struct hlist_node *entry; | |
2153 | struct hlist_head *table; | |
2154 | int i; | |
4e81bb83 | 2155 | |
2518c7c2 DM |
2156 | hlist_for_each_entry(pol, entry, |
2157 | &xfrm_policy_inexact[dir], bydst) | |
2158 | prune_one_bundle(pol, func, &gc_list); | |
2159 | ||
2160 | table = xfrm_policy_bydst[dir].table; | |
2161 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { | |
2162 | hlist_for_each_entry(pol, entry, table + i, bydst) | |
2163 | prune_one_bundle(pol, func, &gc_list); | |
1da177e4 LT |
2164 | } |
2165 | } | |
2166 | read_unlock_bh(&xfrm_policy_lock); | |
2167 | ||
2168 | while (gc_list) { | |
2518c7c2 | 2169 | struct dst_entry *dst = gc_list; |
1da177e4 LT |
2170 | gc_list = dst->next; |
2171 | dst_free(dst); | |
2172 | } | |
2173 | } | |
2174 | ||
2175 | static int unused_bundle(struct dst_entry *dst) | |
2176 | { | |
2177 | return !atomic_read(&dst->__refcnt); | |
2178 | } | |
2179 | ||
2180 | static void __xfrm_garbage_collect(void) | |
2181 | { | |
2182 | xfrm_prune_bundles(unused_bundle); | |
2183 | } | |
2184 | ||
1c095399 | 2185 | static int xfrm_flush_bundles(void) |
1da177e4 LT |
2186 | { |
2187 | xfrm_prune_bundles(stale_bundle); | |
2188 | return 0; | |
2189 | } | |
2190 | ||
25ee3286 | 2191 | static void xfrm_init_pmtu(struct dst_entry *dst) |
1da177e4 LT |
2192 | { |
2193 | do { | |
2194 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2195 | u32 pmtu, route_mtu_cached; | |
2196 | ||
2197 | pmtu = dst_mtu(dst->child); | |
2198 | xdst->child_mtu_cached = pmtu; | |
2199 | ||
2200 | pmtu = xfrm_state_mtu(dst->xfrm, pmtu); | |
2201 | ||
2202 | route_mtu_cached = dst_mtu(xdst->route); | |
2203 | xdst->route_mtu_cached = route_mtu_cached; | |
2204 | ||
2205 | if (pmtu > route_mtu_cached) | |
2206 | pmtu = route_mtu_cached; | |
2207 | ||
2208 | dst->metrics[RTAX_MTU-1] = pmtu; | |
2209 | } while ((dst = dst->next)); | |
2210 | } | |
2211 | ||
1da177e4 LT |
2212 | /* Check that the bundle accepts the flow and its components are |
2213 | * still valid. | |
2214 | */ | |
2215 | ||
5b368e61 VY |
2216 | int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first, |
2217 | struct flowi *fl, int family, int strict) | |
1da177e4 LT |
2218 | { |
2219 | struct dst_entry *dst = &first->u.dst; | |
2220 | struct xfrm_dst *last; | |
2221 | u32 mtu; | |
2222 | ||
92d63dec | 2223 | if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || |
1da177e4 LT |
2224 | (dst->dev && !netif_running(dst->dev))) |
2225 | return 0; | |
157bfc25 MN |
2226 | #ifdef CONFIG_XFRM_SUB_POLICY |
2227 | if (fl) { | |
2228 | if (first->origin && !flow_cache_uli_match(first->origin, fl)) | |
2229 | return 0; | |
2230 | if (first->partner && | |
2231 | !xfrm_selector_match(first->partner, fl, family)) | |
2232 | return 0; | |
2233 | } | |
2234 | #endif | |
1da177e4 LT |
2235 | |
2236 | last = NULL; | |
2237 | ||
2238 | do { | |
2239 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2240 | ||
2241 | if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family)) | |
2242 | return 0; | |
67f83cbf VY |
2243 | if (fl && pol && |
2244 | !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl)) | |
e0d1caa7 | 2245 | return 0; |
1da177e4 LT |
2246 | if (dst->xfrm->km.state != XFRM_STATE_VALID) |
2247 | return 0; | |
9d4a706d DM |
2248 | if (xdst->genid != dst->xfrm->genid) |
2249 | return 0; | |
e53820de | 2250 | |
1bfcb10f | 2251 | if (strict && fl && |
13996378 | 2252 | !(dst->xfrm->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) && |
e53820de MN |
2253 | !xfrm_state_addr_flow_check(dst->xfrm, fl, family)) |
2254 | return 0; | |
1da177e4 LT |
2255 | |
2256 | mtu = dst_mtu(dst->child); | |
2257 | if (xdst->child_mtu_cached != mtu) { | |
2258 | last = xdst; | |
2259 | xdst->child_mtu_cached = mtu; | |
2260 | } | |
2261 | ||
92d63dec | 2262 | if (!dst_check(xdst->route, xdst->route_cookie)) |
1da177e4 LT |
2263 | return 0; |
2264 | mtu = dst_mtu(xdst->route); | |
2265 | if (xdst->route_mtu_cached != mtu) { | |
2266 | last = xdst; | |
2267 | xdst->route_mtu_cached = mtu; | |
2268 | } | |
2269 | ||
2270 | dst = dst->child; | |
2271 | } while (dst->xfrm); | |
2272 | ||
2273 | if (likely(!last)) | |
2274 | return 1; | |
2275 | ||
2276 | mtu = last->child_mtu_cached; | |
2277 | for (;;) { | |
2278 | dst = &last->u.dst; | |
2279 | ||
2280 | mtu = xfrm_state_mtu(dst->xfrm, mtu); | |
2281 | if (mtu > last->route_mtu_cached) | |
2282 | mtu = last->route_mtu_cached; | |
2283 | dst->metrics[RTAX_MTU-1] = mtu; | |
2284 | ||
2285 | if (last == first) | |
2286 | break; | |
2287 | ||
bd0bf076 | 2288 | last = (struct xfrm_dst *)last->u.dst.next; |
1da177e4 LT |
2289 | last->child_mtu_cached = mtu; |
2290 | } | |
2291 | ||
2292 | return 1; | |
2293 | } | |
2294 | ||
2295 | EXPORT_SYMBOL(xfrm_bundle_ok); | |
2296 | ||
1da177e4 LT |
2297 | int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) |
2298 | { | |
2299 | int err = 0; | |
2300 | if (unlikely(afinfo == NULL)) | |
2301 | return -EINVAL; | |
2302 | if (unlikely(afinfo->family >= NPROTO)) | |
2303 | return -EAFNOSUPPORT; | |
e959d812 | 2304 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2305 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) |
2306 | err = -ENOBUFS; | |
2307 | else { | |
2308 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2309 | if (likely(dst_ops->kmem_cachep == NULL)) | |
2310 | dst_ops->kmem_cachep = xfrm_dst_cache; | |
2311 | if (likely(dst_ops->check == NULL)) | |
2312 | dst_ops->check = xfrm_dst_check; | |
1da177e4 LT |
2313 | if (likely(dst_ops->negative_advice == NULL)) |
2314 | dst_ops->negative_advice = xfrm_negative_advice; | |
2315 | if (likely(dst_ops->link_failure == NULL)) | |
2316 | dst_ops->link_failure = xfrm_link_failure; | |
1da177e4 LT |
2317 | if (likely(afinfo->garbage_collect == NULL)) |
2318 | afinfo->garbage_collect = __xfrm_garbage_collect; | |
2319 | xfrm_policy_afinfo[afinfo->family] = afinfo; | |
2320 | } | |
e959d812 | 2321 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2322 | return err; |
2323 | } | |
2324 | EXPORT_SYMBOL(xfrm_policy_register_afinfo); | |
2325 | ||
2326 | int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2327 | { | |
2328 | int err = 0; | |
2329 | if (unlikely(afinfo == NULL)) | |
2330 | return -EINVAL; | |
2331 | if (unlikely(afinfo->family >= NPROTO)) | |
2332 | return -EAFNOSUPPORT; | |
e959d812 | 2333 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2334 | if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { |
2335 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) | |
2336 | err = -EINVAL; | |
2337 | else { | |
2338 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2339 | xfrm_policy_afinfo[afinfo->family] = NULL; | |
2340 | dst_ops->kmem_cachep = NULL; | |
2341 | dst_ops->check = NULL; | |
1da177e4 LT |
2342 | dst_ops->negative_advice = NULL; |
2343 | dst_ops->link_failure = NULL; | |
1da177e4 LT |
2344 | afinfo->garbage_collect = NULL; |
2345 | } | |
2346 | } | |
e959d812 | 2347 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2348 | return err; |
2349 | } | |
2350 | EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); | |
2351 | ||
2352 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) | |
2353 | { | |
2354 | struct xfrm_policy_afinfo *afinfo; | |
2355 | if (unlikely(family >= NPROTO)) | |
2356 | return NULL; | |
2357 | read_lock(&xfrm_policy_afinfo_lock); | |
2358 | afinfo = xfrm_policy_afinfo[family]; | |
546be240 HX |
2359 | if (unlikely(!afinfo)) |
2360 | read_unlock(&xfrm_policy_afinfo_lock); | |
1da177e4 LT |
2361 | return afinfo; |
2362 | } | |
2363 | ||
2364 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2365 | { | |
546be240 HX |
2366 | read_unlock(&xfrm_policy_afinfo_lock); |
2367 | } | |
2368 | ||
1da177e4 LT |
2369 | static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) |
2370 | { | |
e9dc8653 EB |
2371 | struct net_device *dev = ptr; |
2372 | ||
721499e8 | 2373 | if (!net_eq(dev_net(dev), &init_net)) |
e9dc8653 EB |
2374 | return NOTIFY_DONE; |
2375 | ||
1da177e4 LT |
2376 | switch (event) { |
2377 | case NETDEV_DOWN: | |
2378 | xfrm_flush_bundles(); | |
2379 | } | |
2380 | return NOTIFY_DONE; | |
2381 | } | |
2382 | ||
2383 | static struct notifier_block xfrm_dev_notifier = { | |
2384 | xfrm_dev_event, | |
2385 | NULL, | |
2386 | 0 | |
2387 | }; | |
2388 | ||
558f82ef MN |
2389 | #ifdef CONFIG_XFRM_STATISTICS |
2390 | static int __init xfrm_statistics_init(void) | |
2391 | { | |
2392 | if (snmp_mib_init((void **)xfrm_statistics, | |
2393 | sizeof(struct linux_xfrm_mib)) < 0) | |
2394 | return -ENOMEM; | |
2395 | return 0; | |
2396 | } | |
2397 | #endif | |
2398 | ||
1da177e4 LT |
2399 | static void __init xfrm_policy_init(void) |
2400 | { | |
2518c7c2 DM |
2401 | unsigned int hmask, sz; |
2402 | int dir; | |
2403 | ||
1da177e4 LT |
2404 | xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", |
2405 | sizeof(struct xfrm_dst), | |
e5d679f3 | 2406 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
20c2df83 | 2407 | NULL); |
1da177e4 | 2408 | |
2518c7c2 DM |
2409 | hmask = 8 - 1; |
2410 | sz = (hmask+1) * sizeof(struct hlist_head); | |
2411 | ||
44e36b42 | 2412 | xfrm_policy_byidx = xfrm_hash_alloc(sz); |
2518c7c2 DM |
2413 | xfrm_idx_hmask = hmask; |
2414 | if (!xfrm_policy_byidx) | |
2415 | panic("XFRM: failed to allocate byidx hash\n"); | |
2416 | ||
2417 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
2418 | struct xfrm_policy_hash *htab; | |
2419 | ||
2420 | INIT_HLIST_HEAD(&xfrm_policy_inexact[dir]); | |
2421 | ||
2422 | htab = &xfrm_policy_bydst[dir]; | |
44e36b42 | 2423 | htab->table = xfrm_hash_alloc(sz); |
2518c7c2 DM |
2424 | htab->hmask = hmask; |
2425 | if (!htab->table) | |
2426 | panic("XFRM: failed to allocate bydst hash\n"); | |
2427 | } | |
2428 | ||
12a169e7 | 2429 | INIT_LIST_HEAD(&xfrm_policy_all); |
c4028958 | 2430 | INIT_WORK(&xfrm_policy_gc_work, xfrm_policy_gc_task); |
1da177e4 LT |
2431 | register_netdevice_notifier(&xfrm_dev_notifier); |
2432 | } | |
2433 | ||
2434 | void __init xfrm_init(void) | |
2435 | { | |
558f82ef MN |
2436 | #ifdef CONFIG_XFRM_STATISTICS |
2437 | xfrm_statistics_init(); | |
2438 | #endif | |
1da177e4 LT |
2439 | xfrm_state_init(); |
2440 | xfrm_policy_init(); | |
2441 | xfrm_input_init(); | |
558f82ef MN |
2442 | #ifdef CONFIG_XFRM_STATISTICS |
2443 | xfrm_proc_init(); | |
2444 | #endif | |
1da177e4 LT |
2445 | } |
2446 | ||
ab5f5e8b | 2447 | #ifdef CONFIG_AUDITSYSCALL |
1486cbd7 IJ |
2448 | static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp, |
2449 | struct audit_buffer *audit_buf) | |
ab5f5e8b | 2450 | { |
875179fa PM |
2451 | struct xfrm_sec_ctx *ctx = xp->security; |
2452 | struct xfrm_selector *sel = &xp->selector; | |
2453 | ||
2454 | if (ctx) | |
ab5f5e8b | 2455 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", |
875179fa | 2456 | ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); |
ab5f5e8b | 2457 | |
875179fa | 2458 | switch(sel->family) { |
ab5f5e8b | 2459 | case AF_INET: |
875179fa PM |
2460 | audit_log_format(audit_buf, " src=" NIPQUAD_FMT, |
2461 | NIPQUAD(sel->saddr.a4)); | |
2462 | if (sel->prefixlen_s != 32) | |
2463 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2464 | sel->prefixlen_s); | |
2465 | audit_log_format(audit_buf, " dst=" NIPQUAD_FMT, | |
2466 | NIPQUAD(sel->daddr.a4)); | |
2467 | if (sel->prefixlen_d != 32) | |
2468 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2469 | sel->prefixlen_d); | |
ab5f5e8b JL |
2470 | break; |
2471 | case AF_INET6: | |
5b095d98 | 2472 | audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6); |
875179fa PM |
2473 | if (sel->prefixlen_s != 128) |
2474 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2475 | sel->prefixlen_s); | |
5b095d98 | 2476 | audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6); |
875179fa PM |
2477 | if (sel->prefixlen_d != 128) |
2478 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2479 | sel->prefixlen_d); | |
ab5f5e8b JL |
2480 | break; |
2481 | } | |
2482 | } | |
2483 | ||
68277acc | 2484 | void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, |
2532386f | 2485 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2486 | { |
2487 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2488 | |
afeb14b4 | 2489 | audit_buf = xfrm_audit_start("SPD-add"); |
ab5f5e8b JL |
2490 | if (audit_buf == NULL) |
2491 | return; | |
2532386f | 2492 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 | 2493 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
2494 | xfrm_audit_common_policyinfo(xp, audit_buf); |
2495 | audit_log_end(audit_buf); | |
2496 | } | |
2497 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_add); | |
2498 | ||
68277acc | 2499 | void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, |
2532386f | 2500 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2501 | { |
2502 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2503 | |
afeb14b4 | 2504 | audit_buf = xfrm_audit_start("SPD-delete"); |
ab5f5e8b JL |
2505 | if (audit_buf == NULL) |
2506 | return; | |
2532386f | 2507 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 | 2508 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
2509 | xfrm_audit_common_policyinfo(xp, audit_buf); |
2510 | audit_log_end(audit_buf); | |
2511 | } | |
2512 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete); | |
2513 | #endif | |
2514 | ||
80c9abaa SS |
2515 | #ifdef CONFIG_XFRM_MIGRATE |
2516 | static int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp, | |
2517 | struct xfrm_selector *sel_tgt) | |
2518 | { | |
2519 | if (sel_cmp->proto == IPSEC_ULPROTO_ANY) { | |
2520 | if (sel_tgt->family == sel_cmp->family && | |
2521 | xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr, | |
a716c119 | 2522 | sel_cmp->family) == 0 && |
80c9abaa SS |
2523 | xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr, |
2524 | sel_cmp->family) == 0 && | |
2525 | sel_tgt->prefixlen_d == sel_cmp->prefixlen_d && | |
2526 | sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) { | |
2527 | return 1; | |
2528 | } | |
2529 | } else { | |
2530 | if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) { | |
2531 | return 1; | |
2532 | } | |
2533 | } | |
2534 | return 0; | |
2535 | } | |
2536 | ||
2537 | static struct xfrm_policy * xfrm_migrate_policy_find(struct xfrm_selector *sel, | |
2538 | u8 dir, u8 type) | |
2539 | { | |
2540 | struct xfrm_policy *pol, *ret = NULL; | |
2541 | struct hlist_node *entry; | |
2542 | struct hlist_head *chain; | |
2543 | u32 priority = ~0U; | |
2544 | ||
2545 | read_lock_bh(&xfrm_policy_lock); | |
2546 | chain = policy_hash_direct(&sel->daddr, &sel->saddr, sel->family, dir); | |
2547 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
2548 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2549 | pol->type == type) { | |
2550 | ret = pol; | |
2551 | priority = ret->priority; | |
2552 | break; | |
2553 | } | |
2554 | } | |
2555 | chain = &xfrm_policy_inexact[dir]; | |
2556 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
2557 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2558 | pol->type == type && | |
2559 | pol->priority < priority) { | |
2560 | ret = pol; | |
2561 | break; | |
2562 | } | |
2563 | } | |
2564 | ||
2565 | if (ret) | |
2566 | xfrm_pol_hold(ret); | |
2567 | ||
2568 | read_unlock_bh(&xfrm_policy_lock); | |
2569 | ||
2570 | return ret; | |
2571 | } | |
2572 | ||
2573 | static int migrate_tmpl_match(struct xfrm_migrate *m, struct xfrm_tmpl *t) | |
2574 | { | |
2575 | int match = 0; | |
2576 | ||
2577 | if (t->mode == m->mode && t->id.proto == m->proto && | |
2578 | (m->reqid == 0 || t->reqid == m->reqid)) { | |
2579 | switch (t->mode) { | |
2580 | case XFRM_MODE_TUNNEL: | |
2581 | case XFRM_MODE_BEET: | |
2582 | if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr, | |
2583 | m->old_family) == 0 && | |
2584 | xfrm_addr_cmp(&t->saddr, &m->old_saddr, | |
2585 | m->old_family) == 0) { | |
2586 | match = 1; | |
2587 | } | |
2588 | break; | |
2589 | case XFRM_MODE_TRANSPORT: | |
2590 | /* in case of transport mode, template does not store | |
2591 | any IP addresses, hence we just compare mode and | |
2592 | protocol */ | |
2593 | match = 1; | |
2594 | break; | |
2595 | default: | |
2596 | break; | |
2597 | } | |
2598 | } | |
2599 | return match; | |
2600 | } | |
2601 | ||
2602 | /* update endpoint address(es) of template(s) */ | |
2603 | static int xfrm_policy_migrate(struct xfrm_policy *pol, | |
2604 | struct xfrm_migrate *m, int num_migrate) | |
2605 | { | |
2606 | struct xfrm_migrate *mp; | |
2607 | struct dst_entry *dst; | |
2608 | int i, j, n = 0; | |
2609 | ||
2610 | write_lock_bh(&pol->lock); | |
12a169e7 | 2611 | if (unlikely(pol->walk.dead)) { |
80c9abaa SS |
2612 | /* target policy has been deleted */ |
2613 | write_unlock_bh(&pol->lock); | |
2614 | return -ENOENT; | |
2615 | } | |
2616 | ||
2617 | for (i = 0; i < pol->xfrm_nr; i++) { | |
2618 | for (j = 0, mp = m; j < num_migrate; j++, mp++) { | |
2619 | if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i])) | |
2620 | continue; | |
2621 | n++; | |
1bfcb10f HX |
2622 | if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL && |
2623 | pol->xfrm_vec[i].mode != XFRM_MODE_BEET) | |
80c9abaa SS |
2624 | continue; |
2625 | /* update endpoints */ | |
2626 | memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr, | |
2627 | sizeof(pol->xfrm_vec[i].id.daddr)); | |
2628 | memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr, | |
2629 | sizeof(pol->xfrm_vec[i].saddr)); | |
2630 | pol->xfrm_vec[i].encap_family = mp->new_family; | |
2631 | /* flush bundles */ | |
2632 | while ((dst = pol->bundles) != NULL) { | |
2633 | pol->bundles = dst->next; | |
2634 | dst_free(dst); | |
2635 | } | |
2636 | } | |
2637 | } | |
2638 | ||
2639 | write_unlock_bh(&pol->lock); | |
2640 | ||
2641 | if (!n) | |
2642 | return -ENODATA; | |
2643 | ||
2644 | return 0; | |
2645 | } | |
2646 | ||
2647 | static int xfrm_migrate_check(struct xfrm_migrate *m, int num_migrate) | |
2648 | { | |
2649 | int i, j; | |
2650 | ||
2651 | if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) | |
2652 | return -EINVAL; | |
2653 | ||
2654 | for (i = 0; i < num_migrate; i++) { | |
2655 | if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr, | |
2656 | m[i].old_family) == 0) && | |
2657 | (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr, | |
2658 | m[i].old_family) == 0)) | |
2659 | return -EINVAL; | |
2660 | if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) || | |
2661 | xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) | |
2662 | return -EINVAL; | |
2663 | ||
2664 | /* check if there is any duplicated entry */ | |
2665 | for (j = i + 1; j < num_migrate; j++) { | |
2666 | if (!memcmp(&m[i].old_daddr, &m[j].old_daddr, | |
2667 | sizeof(m[i].old_daddr)) && | |
2668 | !memcmp(&m[i].old_saddr, &m[j].old_saddr, | |
2669 | sizeof(m[i].old_saddr)) && | |
2670 | m[i].proto == m[j].proto && | |
2671 | m[i].mode == m[j].mode && | |
2672 | m[i].reqid == m[j].reqid && | |
2673 | m[i].old_family == m[j].old_family) | |
2674 | return -EINVAL; | |
2675 | } | |
2676 | } | |
2677 | ||
2678 | return 0; | |
2679 | } | |
2680 | ||
2681 | int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type, | |
13c1d189 AE |
2682 | struct xfrm_migrate *m, int num_migrate, |
2683 | struct xfrm_kmaddress *k) | |
80c9abaa SS |
2684 | { |
2685 | int i, err, nx_cur = 0, nx_new = 0; | |
2686 | struct xfrm_policy *pol = NULL; | |
2687 | struct xfrm_state *x, *xc; | |
2688 | struct xfrm_state *x_cur[XFRM_MAX_DEPTH]; | |
2689 | struct xfrm_state *x_new[XFRM_MAX_DEPTH]; | |
2690 | struct xfrm_migrate *mp; | |
2691 | ||
2692 | if ((err = xfrm_migrate_check(m, num_migrate)) < 0) | |
2693 | goto out; | |
2694 | ||
2695 | /* Stage 1 - find policy */ | |
2696 | if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) { | |
2697 | err = -ENOENT; | |
2698 | goto out; | |
2699 | } | |
2700 | ||
2701 | /* Stage 2 - find and update state(s) */ | |
2702 | for (i = 0, mp = m; i < num_migrate; i++, mp++) { | |
2703 | if ((x = xfrm_migrate_state_find(mp))) { | |
2704 | x_cur[nx_cur] = x; | |
2705 | nx_cur++; | |
2706 | if ((xc = xfrm_state_migrate(x, mp))) { | |
2707 | x_new[nx_new] = xc; | |
2708 | nx_new++; | |
2709 | } else { | |
2710 | err = -ENODATA; | |
2711 | goto restore_state; | |
2712 | } | |
2713 | } | |
2714 | } | |
2715 | ||
2716 | /* Stage 3 - update policy */ | |
2717 | if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0) | |
2718 | goto restore_state; | |
2719 | ||
2720 | /* Stage 4 - delete old state(s) */ | |
2721 | if (nx_cur) { | |
2722 | xfrm_states_put(x_cur, nx_cur); | |
2723 | xfrm_states_delete(x_cur, nx_cur); | |
2724 | } | |
2725 | ||
2726 | /* Stage 5 - announce */ | |
13c1d189 | 2727 | km_migrate(sel, dir, type, m, num_migrate, k); |
80c9abaa SS |
2728 | |
2729 | xfrm_pol_put(pol); | |
2730 | ||
2731 | return 0; | |
2732 | out: | |
2733 | return err; | |
2734 | ||
2735 | restore_state: | |
2736 | if (pol) | |
2737 | xfrm_pol_put(pol); | |
2738 | if (nx_cur) | |
2739 | xfrm_states_put(x_cur, nx_cur); | |
2740 | if (nx_new) | |
2741 | xfrm_states_delete(x_new, nx_new); | |
2742 | ||
2743 | return err; | |
2744 | } | |
e610e679 | 2745 | EXPORT_SYMBOL(xfrm_migrate); |
80c9abaa | 2746 | #endif |