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Commit | Line | Data |
---|---|---|
a716c119 | 1 | /* |
1da177e4 LT |
2 | * xfrm_policy.c |
3 | * | |
4 | * Changes: | |
5 | * Mitsuru KANDA @USAGI | |
6 | * Kazunori MIYAZAWA @USAGI | |
7 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> | |
8 | * IPv6 support | |
9 | * Kazunori MIYAZAWA @USAGI | |
10 | * YOSHIFUJI Hideaki | |
11 | * Split up af-specific portion | |
12 | * Derek Atkins <derek@ihtfp.com> Add the post_input processor | |
df71837d | 13 | * |
1da177e4 LT |
14 | */ |
15 | ||
66cdb3ca | 16 | #include <linux/err.h> |
1da177e4 LT |
17 | #include <linux/slab.h> |
18 | #include <linux/kmod.h> | |
19 | #include <linux/list.h> | |
20 | #include <linux/spinlock.h> | |
21 | #include <linux/workqueue.h> | |
22 | #include <linux/notifier.h> | |
23 | #include <linux/netdevice.h> | |
eb9c7ebe | 24 | #include <linux/netfilter.h> |
1da177e4 | 25 | #include <linux/module.h> |
2518c7c2 | 26 | #include <linux/cache.h> |
68277acc | 27 | #include <linux/audit.h> |
25ee3286 | 28 | #include <net/dst.h> |
1da177e4 LT |
29 | #include <net/xfrm.h> |
30 | #include <net/ip.h> | |
558f82ef MN |
31 | #ifdef CONFIG_XFRM_STATISTICS |
32 | #include <net/snmp.h> | |
33 | #endif | |
1da177e4 | 34 | |
44e36b42 DM |
35 | #include "xfrm_hash.h" |
36 | ||
28faa979 | 37 | int sysctl_xfrm_larval_drop __read_mostly = 1; |
14e50e57 | 38 | |
558f82ef MN |
39 | #ifdef CONFIG_XFRM_STATISTICS |
40 | DEFINE_SNMP_STAT(struct linux_xfrm_mib, xfrm_statistics) __read_mostly; | |
41 | EXPORT_SYMBOL(xfrm_statistics); | |
42 | #endif | |
43 | ||
4a3e2f71 AV |
44 | DEFINE_MUTEX(xfrm_cfg_mutex); |
45 | EXPORT_SYMBOL(xfrm_cfg_mutex); | |
1da177e4 LT |
46 | |
47 | static DEFINE_RWLOCK(xfrm_policy_lock); | |
48 | ||
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 | 57 | |
2518c7c2 | 58 | static HLIST_HEAD(xfrm_policy_gc_list); |
1da177e4 LT |
59 | static DEFINE_SPINLOCK(xfrm_policy_gc_lock); |
60 | ||
61 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family); | |
62 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo); | |
25ee3286 | 63 | static void xfrm_init_pmtu(struct dst_entry *dst); |
1da177e4 | 64 | |
77681021 AM |
65 | static inline int |
66 | __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl) | |
67 | { | |
68 | return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) && | |
69 | addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) && | |
70 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && | |
71 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && | |
72 | (fl->proto == sel->proto || !sel->proto) && | |
73 | (fl->oif == sel->ifindex || !sel->ifindex); | |
74 | } | |
75 | ||
76 | static inline int | |
77 | __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl) | |
78 | { | |
79 | return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) && | |
80 | addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) && | |
81 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && | |
82 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && | |
83 | (fl->proto == sel->proto || !sel->proto) && | |
84 | (fl->oif == sel->ifindex || !sel->ifindex); | |
85 | } | |
86 | ||
87 | int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, | |
88 | unsigned short family) | |
89 | { | |
90 | switch (family) { | |
91 | case AF_INET: | |
92 | return __xfrm4_selector_match(sel, fl); | |
93 | case AF_INET6: | |
94 | return __xfrm6_selector_match(sel, fl); | |
95 | } | |
96 | return 0; | |
97 | } | |
98 | ||
9bb182a7 YH |
99 | static inline struct dst_entry *__xfrm_dst_lookup(int tos, |
100 | xfrm_address_t *saddr, | |
101 | xfrm_address_t *daddr, | |
102 | int family) | |
103 | { | |
104 | struct xfrm_policy_afinfo *afinfo; | |
105 | struct dst_entry *dst; | |
106 | ||
107 | afinfo = xfrm_policy_get_afinfo(family); | |
108 | if (unlikely(afinfo == NULL)) | |
109 | return ERR_PTR(-EAFNOSUPPORT); | |
110 | ||
111 | dst = afinfo->dst_lookup(tos, saddr, daddr); | |
112 | ||
113 | xfrm_policy_put_afinfo(afinfo); | |
114 | ||
115 | return dst; | |
116 | } | |
117 | ||
25ee3286 | 118 | static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos, |
9bb182a7 YH |
119 | xfrm_address_t *prev_saddr, |
120 | xfrm_address_t *prev_daddr, | |
25ee3286 | 121 | int family) |
1da177e4 | 122 | { |
66cdb3ca HX |
123 | xfrm_address_t *saddr = &x->props.saddr; |
124 | xfrm_address_t *daddr = &x->id.daddr; | |
66cdb3ca HX |
125 | struct dst_entry *dst; |
126 | ||
9bb182a7 | 127 | if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) { |
66cdb3ca | 128 | saddr = x->coaddr; |
9bb182a7 YH |
129 | daddr = prev_daddr; |
130 | } | |
131 | if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) { | |
132 | saddr = prev_saddr; | |
66cdb3ca | 133 | daddr = x->coaddr; |
9bb182a7 | 134 | } |
1da177e4 | 135 | |
9bb182a7 YH |
136 | dst = __xfrm_dst_lookup(tos, saddr, daddr, family); |
137 | ||
138 | if (!IS_ERR(dst)) { | |
139 | if (prev_saddr != saddr) | |
140 | memcpy(prev_saddr, saddr, sizeof(*prev_saddr)); | |
141 | if (prev_daddr != daddr) | |
142 | memcpy(prev_daddr, daddr, sizeof(*prev_daddr)); | |
143 | } | |
1da177e4 | 144 | |
66cdb3ca | 145 | return dst; |
1da177e4 | 146 | } |
1da177e4 | 147 | |
1da177e4 LT |
148 | static inline unsigned long make_jiffies(long secs) |
149 | { | |
150 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
151 | return MAX_SCHEDULE_TIMEOUT-1; | |
152 | else | |
a716c119 | 153 | return secs*HZ; |
1da177e4 LT |
154 | } |
155 | ||
156 | static void xfrm_policy_timer(unsigned long data) | |
157 | { | |
158 | struct xfrm_policy *xp = (struct xfrm_policy*)data; | |
9d729f72 | 159 | unsigned long now = get_seconds(); |
1da177e4 LT |
160 | long next = LONG_MAX; |
161 | int warn = 0; | |
162 | int dir; | |
163 | ||
164 | read_lock(&xp->lock); | |
165 | ||
12a169e7 | 166 | if (xp->walk.dead) |
1da177e4 LT |
167 | goto out; |
168 | ||
77d8d7a6 | 169 | dir = xfrm_policy_id2dir(xp->index); |
1da177e4 LT |
170 | |
171 | if (xp->lft.hard_add_expires_seconds) { | |
172 | long tmo = xp->lft.hard_add_expires_seconds + | |
173 | xp->curlft.add_time - now; | |
174 | if (tmo <= 0) | |
175 | goto expired; | |
176 | if (tmo < next) | |
177 | next = tmo; | |
178 | } | |
179 | if (xp->lft.hard_use_expires_seconds) { | |
180 | long tmo = xp->lft.hard_use_expires_seconds + | |
181 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
182 | if (tmo <= 0) | |
183 | goto expired; | |
184 | if (tmo < next) | |
185 | next = tmo; | |
186 | } | |
187 | if (xp->lft.soft_add_expires_seconds) { | |
188 | long tmo = xp->lft.soft_add_expires_seconds + | |
189 | xp->curlft.add_time - now; | |
190 | if (tmo <= 0) { | |
191 | warn = 1; | |
192 | tmo = XFRM_KM_TIMEOUT; | |
193 | } | |
194 | if (tmo < next) | |
195 | next = tmo; | |
196 | } | |
197 | if (xp->lft.soft_use_expires_seconds) { | |
198 | long tmo = xp->lft.soft_use_expires_seconds + | |
199 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
200 | if (tmo <= 0) { | |
201 | warn = 1; | |
202 | tmo = XFRM_KM_TIMEOUT; | |
203 | } | |
204 | if (tmo < next) | |
205 | next = tmo; | |
206 | } | |
207 | ||
208 | if (warn) | |
6c5c8ca7 | 209 | km_policy_expired(xp, dir, 0, 0); |
1da177e4 LT |
210 | if (next != LONG_MAX && |
211 | !mod_timer(&xp->timer, jiffies + make_jiffies(next))) | |
212 | xfrm_pol_hold(xp); | |
213 | ||
214 | out: | |
215 | read_unlock(&xp->lock); | |
216 | xfrm_pol_put(xp); | |
217 | return; | |
218 | ||
219 | expired: | |
220 | read_unlock(&xp->lock); | |
4666faab | 221 | if (!xfrm_policy_delete(xp, dir)) |
6c5c8ca7 | 222 | km_policy_expired(xp, dir, 1, 0); |
1da177e4 LT |
223 | xfrm_pol_put(xp); |
224 | } | |
225 | ||
226 | ||
227 | /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2 | |
228 | * SPD calls. | |
229 | */ | |
230 | ||
0331b1f3 | 231 | struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp) |
1da177e4 LT |
232 | { |
233 | struct xfrm_policy *policy; | |
234 | ||
0da974f4 | 235 | policy = kzalloc(sizeof(struct xfrm_policy), gfp); |
1da177e4 LT |
236 | |
237 | if (policy) { | |
0331b1f3 | 238 | write_pnet(&policy->xp_net, net); |
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 | 298 | } |
c9583969 | 299 | static DECLARE_WORK(xfrm_policy_gc_work, xfrm_policy_gc_task); |
1da177e4 LT |
300 | |
301 | /* Rule must be locked. Release descentant resources, announce | |
302 | * entry dead. The rule must be unlinked from lists to the moment. | |
303 | */ | |
304 | ||
305 | static void xfrm_policy_kill(struct xfrm_policy *policy) | |
306 | { | |
307 | int dead; | |
308 | ||
309 | write_lock_bh(&policy->lock); | |
12a169e7 HX |
310 | dead = policy->walk.dead; |
311 | policy->walk.dead = 1; | |
1da177e4 LT |
312 | write_unlock_bh(&policy->lock); |
313 | ||
314 | if (unlikely(dead)) { | |
315 | WARN_ON(1); | |
316 | return; | |
317 | } | |
318 | ||
bbb770e7 | 319 | spin_lock_bh(&xfrm_policy_gc_lock); |
2518c7c2 | 320 | hlist_add_head(&policy->bydst, &xfrm_policy_gc_list); |
bbb770e7 | 321 | spin_unlock_bh(&xfrm_policy_gc_lock); |
1da177e4 LT |
322 | |
323 | schedule_work(&xfrm_policy_gc_work); | |
324 | } | |
325 | ||
2518c7c2 DM |
326 | struct xfrm_policy_hash { |
327 | struct hlist_head *table; | |
328 | unsigned int hmask; | |
329 | }; | |
330 | ||
331 | static struct hlist_head xfrm_policy_inexact[XFRM_POLICY_MAX*2]; | |
332 | static struct xfrm_policy_hash xfrm_policy_bydst[XFRM_POLICY_MAX*2] __read_mostly; | |
333 | static struct hlist_head *xfrm_policy_byidx __read_mostly; | |
334 | static unsigned int xfrm_idx_hmask __read_mostly; | |
335 | static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024; | |
336 | ||
2518c7c2 DM |
337 | static inline unsigned int idx_hash(u32 index) |
338 | { | |
339 | return __idx_hash(index, xfrm_idx_hmask); | |
340 | } | |
341 | ||
2518c7c2 DM |
342 | static struct hlist_head *policy_hash_bysel(struct xfrm_selector *sel, unsigned short family, int dir) |
343 | { | |
344 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
345 | unsigned int hash = __sel_hash(sel, family, hmask); | |
346 | ||
347 | return (hash == hmask + 1 ? | |
348 | &xfrm_policy_inexact[dir] : | |
349 | xfrm_policy_bydst[dir].table + hash); | |
350 | } | |
351 | ||
352 | static struct hlist_head *policy_hash_direct(xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir) | |
353 | { | |
354 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
355 | unsigned int hash = __addr_hash(daddr, saddr, family, hmask); | |
356 | ||
357 | return xfrm_policy_bydst[dir].table + hash; | |
358 | } | |
359 | ||
2518c7c2 DM |
360 | static void xfrm_dst_hash_transfer(struct hlist_head *list, |
361 | struct hlist_head *ndsttable, | |
362 | unsigned int nhashmask) | |
363 | { | |
b791160b | 364 | struct hlist_node *entry, *tmp, *entry0 = NULL; |
2518c7c2 | 365 | struct xfrm_policy *pol; |
b791160b | 366 | unsigned int h0 = 0; |
2518c7c2 | 367 | |
b791160b | 368 | redo: |
2518c7c2 DM |
369 | hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) { |
370 | unsigned int h; | |
371 | ||
372 | h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr, | |
373 | pol->family, nhashmask); | |
b791160b YH |
374 | if (!entry0) { |
375 | hlist_del(entry); | |
376 | hlist_add_head(&pol->bydst, ndsttable+h); | |
377 | h0 = h; | |
378 | } else { | |
379 | if (h != h0) | |
380 | continue; | |
381 | hlist_del(entry); | |
382 | hlist_add_after(entry0, &pol->bydst); | |
383 | } | |
384 | entry0 = entry; | |
385 | } | |
386 | if (!hlist_empty(list)) { | |
387 | entry0 = NULL; | |
388 | goto redo; | |
2518c7c2 DM |
389 | } |
390 | } | |
391 | ||
392 | static void xfrm_idx_hash_transfer(struct hlist_head *list, | |
393 | struct hlist_head *nidxtable, | |
394 | unsigned int nhashmask) | |
395 | { | |
396 | struct hlist_node *entry, *tmp; | |
397 | struct xfrm_policy *pol; | |
398 | ||
399 | hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) { | |
400 | unsigned int h; | |
401 | ||
402 | h = __idx_hash(pol->index, nhashmask); | |
403 | hlist_add_head(&pol->byidx, nidxtable+h); | |
404 | } | |
405 | } | |
406 | ||
407 | static unsigned long xfrm_new_hash_mask(unsigned int old_hmask) | |
408 | { | |
409 | return ((old_hmask + 1) << 1) - 1; | |
410 | } | |
411 | ||
412 | static void xfrm_bydst_resize(int dir) | |
413 | { | |
414 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
415 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); | |
416 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
417 | struct hlist_head *odst = xfrm_policy_bydst[dir].table; | |
44e36b42 | 418 | struct hlist_head *ndst = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
419 | int i; |
420 | ||
421 | if (!ndst) | |
422 | return; | |
423 | ||
424 | write_lock_bh(&xfrm_policy_lock); | |
425 | ||
426 | for (i = hmask; i >= 0; i--) | |
427 | xfrm_dst_hash_transfer(odst + i, ndst, nhashmask); | |
428 | ||
429 | xfrm_policy_bydst[dir].table = ndst; | |
430 | xfrm_policy_bydst[dir].hmask = nhashmask; | |
431 | ||
432 | write_unlock_bh(&xfrm_policy_lock); | |
433 | ||
44e36b42 | 434 | xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
435 | } |
436 | ||
437 | static void xfrm_byidx_resize(int total) | |
438 | { | |
439 | unsigned int hmask = xfrm_idx_hmask; | |
440 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); | |
441 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
442 | struct hlist_head *oidx = xfrm_policy_byidx; | |
44e36b42 | 443 | struct hlist_head *nidx = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
444 | int i; |
445 | ||
446 | if (!nidx) | |
447 | return; | |
448 | ||
449 | write_lock_bh(&xfrm_policy_lock); | |
450 | ||
451 | for (i = hmask; i >= 0; i--) | |
452 | xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask); | |
453 | ||
454 | xfrm_policy_byidx = nidx; | |
455 | xfrm_idx_hmask = nhashmask; | |
456 | ||
457 | write_unlock_bh(&xfrm_policy_lock); | |
458 | ||
44e36b42 | 459 | xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
460 | } |
461 | ||
462 | static inline int xfrm_bydst_should_resize(int dir, int *total) | |
463 | { | |
464 | unsigned int cnt = xfrm_policy_count[dir]; | |
465 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
466 | ||
467 | if (total) | |
468 | *total += cnt; | |
469 | ||
470 | if ((hmask + 1) < xfrm_policy_hashmax && | |
471 | cnt > hmask) | |
472 | return 1; | |
473 | ||
474 | return 0; | |
475 | } | |
476 | ||
477 | static inline int xfrm_byidx_should_resize(int total) | |
478 | { | |
479 | unsigned int hmask = xfrm_idx_hmask; | |
480 | ||
481 | if ((hmask + 1) < xfrm_policy_hashmax && | |
482 | total > hmask) | |
483 | return 1; | |
484 | ||
485 | return 0; | |
486 | } | |
487 | ||
5a6d3416 | 488 | void xfrm_spd_getinfo(struct xfrmk_spdinfo *si) |
ecfd6b18 JHS |
489 | { |
490 | read_lock_bh(&xfrm_policy_lock); | |
491 | si->incnt = xfrm_policy_count[XFRM_POLICY_IN]; | |
492 | si->outcnt = xfrm_policy_count[XFRM_POLICY_OUT]; | |
493 | si->fwdcnt = xfrm_policy_count[XFRM_POLICY_FWD]; | |
494 | si->inscnt = xfrm_policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX]; | |
495 | si->outscnt = xfrm_policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX]; | |
496 | si->fwdscnt = xfrm_policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX]; | |
497 | si->spdhcnt = xfrm_idx_hmask; | |
498 | si->spdhmcnt = xfrm_policy_hashmax; | |
499 | read_unlock_bh(&xfrm_policy_lock); | |
500 | } | |
501 | EXPORT_SYMBOL(xfrm_spd_getinfo); | |
2518c7c2 | 502 | |
ecfd6b18 | 503 | static DEFINE_MUTEX(hash_resize_mutex); |
c4028958 | 504 | static void xfrm_hash_resize(struct work_struct *__unused) |
2518c7c2 DM |
505 | { |
506 | int dir, total; | |
507 | ||
508 | mutex_lock(&hash_resize_mutex); | |
509 | ||
510 | total = 0; | |
511 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
512 | if (xfrm_bydst_should_resize(dir, &total)) | |
513 | xfrm_bydst_resize(dir); | |
514 | } | |
515 | if (xfrm_byidx_should_resize(total)) | |
516 | xfrm_byidx_resize(total); | |
517 | ||
518 | mutex_unlock(&hash_resize_mutex); | |
519 | } | |
520 | ||
c4028958 | 521 | static DECLARE_WORK(xfrm_hash_work, xfrm_hash_resize); |
2518c7c2 | 522 | |
1da177e4 LT |
523 | /* Generate new index... KAME seems to generate them ordered by cost |
524 | * of an absolute inpredictability of ordering of rules. This will not pass. */ | |
7a12122c | 525 | static u32 xfrm_gen_index(int dir) |
1da177e4 | 526 | { |
1da177e4 LT |
527 | static u32 idx_generator; |
528 | ||
529 | for (;;) { | |
2518c7c2 DM |
530 | struct hlist_node *entry; |
531 | struct hlist_head *list; | |
532 | struct xfrm_policy *p; | |
533 | u32 idx; | |
534 | int found; | |
535 | ||
1da177e4 LT |
536 | idx = (idx_generator | dir); |
537 | idx_generator += 8; | |
538 | if (idx == 0) | |
539 | idx = 8; | |
2518c7c2 DM |
540 | list = xfrm_policy_byidx + idx_hash(idx); |
541 | found = 0; | |
542 | hlist_for_each_entry(p, entry, list, byidx) { | |
543 | if (p->index == idx) { | |
544 | found = 1; | |
1da177e4 | 545 | break; |
2518c7c2 | 546 | } |
1da177e4 | 547 | } |
2518c7c2 | 548 | if (!found) |
1da177e4 LT |
549 | return idx; |
550 | } | |
551 | } | |
552 | ||
2518c7c2 DM |
553 | static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2) |
554 | { | |
555 | u32 *p1 = (u32 *) s1; | |
556 | u32 *p2 = (u32 *) s2; | |
557 | int len = sizeof(struct xfrm_selector) / sizeof(u32); | |
558 | int i; | |
559 | ||
560 | for (i = 0; i < len; i++) { | |
561 | if (p1[i] != p2[i]) | |
562 | return 1; | |
563 | } | |
564 | ||
565 | return 0; | |
566 | } | |
567 | ||
1da177e4 LT |
568 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) |
569 | { | |
2518c7c2 DM |
570 | struct xfrm_policy *pol; |
571 | struct xfrm_policy *delpol; | |
572 | struct hlist_head *chain; | |
a6c7ab55 | 573 | struct hlist_node *entry, *newpos; |
9b78a82c | 574 | struct dst_entry *gc_list; |
1da177e4 LT |
575 | |
576 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
577 | chain = policy_hash_bysel(&policy->selector, policy->family, dir); |
578 | delpol = NULL; | |
579 | newpos = NULL; | |
2518c7c2 | 580 | hlist_for_each_entry(pol, entry, chain, bydst) { |
a6c7ab55 | 581 | if (pol->type == policy->type && |
2518c7c2 | 582 | !selector_cmp(&pol->selector, &policy->selector) && |
a6c7ab55 HX |
583 | xfrm_sec_ctx_match(pol->security, policy->security) && |
584 | !WARN_ON(delpol)) { | |
1da177e4 LT |
585 | if (excl) { |
586 | write_unlock_bh(&xfrm_policy_lock); | |
587 | return -EEXIST; | |
588 | } | |
1da177e4 LT |
589 | delpol = pol; |
590 | if (policy->priority > pol->priority) | |
591 | continue; | |
592 | } else if (policy->priority >= pol->priority) { | |
a6c7ab55 | 593 | newpos = &pol->bydst; |
1da177e4 LT |
594 | continue; |
595 | } | |
1da177e4 LT |
596 | if (delpol) |
597 | break; | |
1da177e4 LT |
598 | } |
599 | if (newpos) | |
2518c7c2 DM |
600 | hlist_add_after(newpos, &policy->bydst); |
601 | else | |
602 | hlist_add_head(&policy->bydst, chain); | |
1da177e4 | 603 | xfrm_pol_hold(policy); |
2518c7c2 | 604 | xfrm_policy_count[dir]++; |
1da177e4 | 605 | atomic_inc(&flow_cache_genid); |
2518c7c2 DM |
606 | if (delpol) { |
607 | hlist_del(&delpol->bydst); | |
608 | hlist_del(&delpol->byidx); | |
12a169e7 | 609 | list_del(&delpol->walk.all); |
2518c7c2 DM |
610 | xfrm_policy_count[dir]--; |
611 | } | |
7a12122c | 612 | policy->index = delpol ? delpol->index : xfrm_gen_index(dir); |
2518c7c2 | 613 | hlist_add_head(&policy->byidx, xfrm_policy_byidx+idx_hash(policy->index)); |
9d729f72 | 614 | policy->curlft.add_time = get_seconds(); |
1da177e4 LT |
615 | policy->curlft.use_time = 0; |
616 | if (!mod_timer(&policy->timer, jiffies + HZ)) | |
617 | xfrm_pol_hold(policy); | |
12a169e7 | 618 | list_add(&policy->walk.all, &xfrm_policy_all); |
1da177e4 LT |
619 | write_unlock_bh(&xfrm_policy_lock); |
620 | ||
9b78a82c | 621 | if (delpol) |
1da177e4 | 622 | xfrm_policy_kill(delpol); |
2518c7c2 DM |
623 | else if (xfrm_bydst_should_resize(dir, NULL)) |
624 | schedule_work(&xfrm_hash_work); | |
9b78a82c DM |
625 | |
626 | read_lock_bh(&xfrm_policy_lock); | |
627 | gc_list = NULL; | |
2518c7c2 DM |
628 | entry = &policy->bydst; |
629 | hlist_for_each_entry_continue(policy, entry, bydst) { | |
9b78a82c DM |
630 | struct dst_entry *dst; |
631 | ||
632 | write_lock(&policy->lock); | |
633 | dst = policy->bundles; | |
634 | if (dst) { | |
635 | struct dst_entry *tail = dst; | |
636 | while (tail->next) | |
637 | tail = tail->next; | |
638 | tail->next = gc_list; | |
639 | gc_list = dst; | |
640 | ||
641 | policy->bundles = NULL; | |
642 | } | |
643 | write_unlock(&policy->lock); | |
1da177e4 | 644 | } |
9b78a82c DM |
645 | read_unlock_bh(&xfrm_policy_lock); |
646 | ||
647 | while (gc_list) { | |
648 | struct dst_entry *dst = gc_list; | |
649 | ||
650 | gc_list = dst->next; | |
651 | dst_free(dst); | |
652 | } | |
653 | ||
1da177e4 LT |
654 | return 0; |
655 | } | |
656 | EXPORT_SYMBOL(xfrm_policy_insert); | |
657 | ||
4e81bb83 MN |
658 | struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir, |
659 | struct xfrm_selector *sel, | |
ef41aaa0 EP |
660 | struct xfrm_sec_ctx *ctx, int delete, |
661 | int *err) | |
1da177e4 | 662 | { |
2518c7c2 DM |
663 | struct xfrm_policy *pol, *ret; |
664 | struct hlist_head *chain; | |
665 | struct hlist_node *entry; | |
1da177e4 | 666 | |
ef41aaa0 | 667 | *err = 0; |
1da177e4 | 668 | write_lock_bh(&xfrm_policy_lock); |
2518c7c2 DM |
669 | chain = policy_hash_bysel(sel, sel->family, dir); |
670 | ret = NULL; | |
671 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
672 | if (pol->type == type && | |
673 | !selector_cmp(sel, &pol->selector) && | |
674 | xfrm_sec_ctx_match(ctx, pol->security)) { | |
1da177e4 | 675 | xfrm_pol_hold(pol); |
2518c7c2 | 676 | if (delete) { |
03e1ad7b PM |
677 | *err = security_xfrm_policy_delete( |
678 | pol->security); | |
ef41aaa0 EP |
679 | if (*err) { |
680 | write_unlock_bh(&xfrm_policy_lock); | |
681 | return pol; | |
682 | } | |
2518c7c2 DM |
683 | hlist_del(&pol->bydst); |
684 | hlist_del(&pol->byidx); | |
12a169e7 | 685 | list_del(&pol->walk.all); |
2518c7c2 DM |
686 | xfrm_policy_count[dir]--; |
687 | } | |
688 | ret = pol; | |
1da177e4 LT |
689 | break; |
690 | } | |
691 | } | |
692 | write_unlock_bh(&xfrm_policy_lock); | |
693 | ||
2518c7c2 | 694 | if (ret && delete) { |
1da177e4 | 695 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 696 | xfrm_policy_kill(ret); |
1da177e4 | 697 | } |
2518c7c2 | 698 | return ret; |
1da177e4 | 699 | } |
df71837d | 700 | EXPORT_SYMBOL(xfrm_policy_bysel_ctx); |
1da177e4 | 701 | |
ef41aaa0 EP |
702 | struct xfrm_policy *xfrm_policy_byid(u8 type, int dir, u32 id, int delete, |
703 | int *err) | |
1da177e4 | 704 | { |
2518c7c2 DM |
705 | struct xfrm_policy *pol, *ret; |
706 | struct hlist_head *chain; | |
707 | struct hlist_node *entry; | |
1da177e4 | 708 | |
b5505c6e HX |
709 | *err = -ENOENT; |
710 | if (xfrm_policy_id2dir(id) != dir) | |
711 | return NULL; | |
712 | ||
ef41aaa0 | 713 | *err = 0; |
1da177e4 | 714 | write_lock_bh(&xfrm_policy_lock); |
2518c7c2 DM |
715 | chain = xfrm_policy_byidx + idx_hash(id); |
716 | ret = NULL; | |
717 | hlist_for_each_entry(pol, entry, chain, byidx) { | |
718 | if (pol->type == type && pol->index == id) { | |
1da177e4 | 719 | xfrm_pol_hold(pol); |
2518c7c2 | 720 | if (delete) { |
03e1ad7b PM |
721 | *err = security_xfrm_policy_delete( |
722 | pol->security); | |
ef41aaa0 EP |
723 | if (*err) { |
724 | write_unlock_bh(&xfrm_policy_lock); | |
725 | return pol; | |
726 | } | |
2518c7c2 DM |
727 | hlist_del(&pol->bydst); |
728 | hlist_del(&pol->byidx); | |
12a169e7 | 729 | list_del(&pol->walk.all); |
2518c7c2 DM |
730 | xfrm_policy_count[dir]--; |
731 | } | |
732 | ret = pol; | |
1da177e4 LT |
733 | break; |
734 | } | |
735 | } | |
736 | write_unlock_bh(&xfrm_policy_lock); | |
737 | ||
2518c7c2 | 738 | if (ret && delete) { |
1da177e4 | 739 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 740 | xfrm_policy_kill(ret); |
1da177e4 | 741 | } |
2518c7c2 | 742 | return ret; |
1da177e4 LT |
743 | } |
744 | EXPORT_SYMBOL(xfrm_policy_byid); | |
745 | ||
4aa2e62c JL |
746 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
747 | static inline int | |
748 | xfrm_policy_flush_secctx_check(u8 type, struct xfrm_audit *audit_info) | |
1da177e4 | 749 | { |
4aa2e62c JL |
750 | int dir, err = 0; |
751 | ||
752 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { | |
753 | struct xfrm_policy *pol; | |
754 | struct hlist_node *entry; | |
755 | int i; | |
756 | ||
757 | hlist_for_each_entry(pol, entry, | |
758 | &xfrm_policy_inexact[dir], bydst) { | |
759 | if (pol->type != type) | |
760 | continue; | |
03e1ad7b | 761 | err = security_xfrm_policy_delete(pol->security); |
4aa2e62c | 762 | if (err) { |
ab5f5e8b JL |
763 | xfrm_audit_policy_delete(pol, 0, |
764 | audit_info->loginuid, | |
2532386f | 765 | audit_info->sessionid, |
ab5f5e8b | 766 | audit_info->secid); |
4aa2e62c JL |
767 | return err; |
768 | } | |
7dc12d6d | 769 | } |
4aa2e62c JL |
770 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { |
771 | hlist_for_each_entry(pol, entry, | |
772 | xfrm_policy_bydst[dir].table + i, | |
773 | bydst) { | |
774 | if (pol->type != type) | |
775 | continue; | |
03e1ad7b PM |
776 | err = security_xfrm_policy_delete( |
777 | pol->security); | |
4aa2e62c | 778 | if (err) { |
ab5f5e8b JL |
779 | xfrm_audit_policy_delete(pol, 0, |
780 | audit_info->loginuid, | |
2532386f | 781 | audit_info->sessionid, |
ab5f5e8b | 782 | audit_info->secid); |
4aa2e62c JL |
783 | return err; |
784 | } | |
785 | } | |
786 | } | |
787 | } | |
788 | return err; | |
789 | } | |
790 | #else | |
791 | static inline int | |
792 | xfrm_policy_flush_secctx_check(u8 type, struct xfrm_audit *audit_info) | |
793 | { | |
794 | return 0; | |
795 | } | |
796 | #endif | |
797 | ||
798 | int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info) | |
799 | { | |
800 | int dir, err = 0; | |
1da177e4 LT |
801 | |
802 | write_lock_bh(&xfrm_policy_lock); | |
4aa2e62c JL |
803 | |
804 | err = xfrm_policy_flush_secctx_check(type, audit_info); | |
805 | if (err) | |
806 | goto out; | |
807 | ||
1da177e4 | 808 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
2518c7c2 DM |
809 | struct xfrm_policy *pol; |
810 | struct hlist_node *entry; | |
ae8c0577 | 811 | int i, killed; |
2518c7c2 | 812 | |
ae8c0577 | 813 | killed = 0; |
2518c7c2 DM |
814 | again1: |
815 | hlist_for_each_entry(pol, entry, | |
816 | &xfrm_policy_inexact[dir], bydst) { | |
817 | if (pol->type != type) | |
818 | continue; | |
819 | hlist_del(&pol->bydst); | |
820 | hlist_del(&pol->byidx); | |
1da177e4 LT |
821 | write_unlock_bh(&xfrm_policy_lock); |
822 | ||
ab5f5e8b | 823 | xfrm_audit_policy_delete(pol, 1, audit_info->loginuid, |
2532386f | 824 | audit_info->sessionid, |
ab5f5e8b | 825 | audit_info->secid); |
161a09e7 | 826 | |
2518c7c2 | 827 | xfrm_policy_kill(pol); |
ae8c0577 | 828 | killed++; |
1da177e4 LT |
829 | |
830 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
831 | goto again1; |
832 | } | |
833 | ||
834 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { | |
835 | again2: | |
836 | hlist_for_each_entry(pol, entry, | |
837 | xfrm_policy_bydst[dir].table + i, | |
838 | bydst) { | |
839 | if (pol->type != type) | |
840 | continue; | |
841 | hlist_del(&pol->bydst); | |
842 | hlist_del(&pol->byidx); | |
12a169e7 | 843 | list_del(&pol->walk.all); |
2518c7c2 DM |
844 | write_unlock_bh(&xfrm_policy_lock); |
845 | ||
ab5f5e8b JL |
846 | xfrm_audit_policy_delete(pol, 1, |
847 | audit_info->loginuid, | |
2532386f | 848 | audit_info->sessionid, |
ab5f5e8b | 849 | audit_info->secid); |
2518c7c2 | 850 | xfrm_policy_kill(pol); |
ae8c0577 | 851 | killed++; |
2518c7c2 DM |
852 | |
853 | write_lock_bh(&xfrm_policy_lock); | |
854 | goto again2; | |
855 | } | |
1da177e4 | 856 | } |
2518c7c2 | 857 | |
ae8c0577 | 858 | xfrm_policy_count[dir] -= killed; |
1da177e4 LT |
859 | } |
860 | atomic_inc(&flow_cache_genid); | |
4aa2e62c | 861 | out: |
1da177e4 | 862 | write_unlock_bh(&xfrm_policy_lock); |
4aa2e62c | 863 | return err; |
1da177e4 LT |
864 | } |
865 | EXPORT_SYMBOL(xfrm_policy_flush); | |
866 | ||
4c563f76 TT |
867 | int xfrm_policy_walk(struct xfrm_policy_walk *walk, |
868 | int (*func)(struct xfrm_policy *, int, int, void*), | |
1da177e4 LT |
869 | void *data) |
870 | { | |
12a169e7 HX |
871 | struct xfrm_policy *pol; |
872 | struct xfrm_policy_walk_entry *x; | |
4c563f76 TT |
873 | int error = 0; |
874 | ||
875 | if (walk->type >= XFRM_POLICY_TYPE_MAX && | |
876 | walk->type != XFRM_POLICY_TYPE_ANY) | |
877 | return -EINVAL; | |
1da177e4 | 878 | |
12a169e7 | 879 | if (list_empty(&walk->walk.all) && walk->seq != 0) |
4c563f76 TT |
880 | return 0; |
881 | ||
12a169e7 HX |
882 | write_lock_bh(&xfrm_policy_lock); |
883 | if (list_empty(&walk->walk.all)) | |
884 | x = list_first_entry(&xfrm_policy_all, struct xfrm_policy_walk_entry, all); | |
885 | else | |
886 | x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all); | |
887 | list_for_each_entry_from(x, &xfrm_policy_all, all) { | |
888 | if (x->dead) | |
4c563f76 | 889 | continue; |
12a169e7 HX |
890 | pol = container_of(x, struct xfrm_policy, walk); |
891 | if (walk->type != XFRM_POLICY_TYPE_ANY && | |
892 | walk->type != pol->type) | |
893 | continue; | |
894 | error = func(pol, xfrm_policy_id2dir(pol->index), | |
895 | walk->seq, data); | |
896 | if (error) { | |
897 | list_move_tail(&walk->walk.all, &x->all); | |
898 | goto out; | |
2518c7c2 | 899 | } |
12a169e7 | 900 | walk->seq++; |
1da177e4 | 901 | } |
12a169e7 | 902 | if (walk->seq == 0) { |
baf5d743 JHS |
903 | error = -ENOENT; |
904 | goto out; | |
905 | } | |
12a169e7 | 906 | list_del_init(&walk->walk.all); |
1da177e4 | 907 | out: |
12a169e7 | 908 | write_unlock_bh(&xfrm_policy_lock); |
1da177e4 LT |
909 | return error; |
910 | } | |
911 | EXPORT_SYMBOL(xfrm_policy_walk); | |
912 | ||
12a169e7 HX |
913 | void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type) |
914 | { | |
915 | INIT_LIST_HEAD(&walk->walk.all); | |
916 | walk->walk.dead = 1; | |
917 | walk->type = type; | |
918 | walk->seq = 0; | |
919 | } | |
920 | EXPORT_SYMBOL(xfrm_policy_walk_init); | |
921 | ||
922 | void xfrm_policy_walk_done(struct xfrm_policy_walk *walk) | |
923 | { | |
924 | if (list_empty(&walk->walk.all)) | |
925 | return; | |
926 | ||
927 | write_lock_bh(&xfrm_policy_lock); | |
928 | list_del(&walk->walk.all); | |
929 | write_unlock_bh(&xfrm_policy_lock); | |
930 | } | |
931 | EXPORT_SYMBOL(xfrm_policy_walk_done); | |
932 | ||
134b0fc5 JM |
933 | /* |
934 | * Find policy to apply to this flow. | |
935 | * | |
936 | * Returns 0 if policy found, else an -errno. | |
937 | */ | |
2518c7c2 DM |
938 | static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl, |
939 | u8 type, u16 family, int dir) | |
1da177e4 | 940 | { |
2518c7c2 | 941 | struct xfrm_selector *sel = &pol->selector; |
134b0fc5 | 942 | int match, ret = -ESRCH; |
1da177e4 | 943 | |
2518c7c2 DM |
944 | if (pol->family != family || |
945 | pol->type != type) | |
134b0fc5 | 946 | return ret; |
1da177e4 | 947 | |
2518c7c2 | 948 | match = xfrm_selector_match(sel, fl, family); |
134b0fc5 | 949 | if (match) |
03e1ad7b PM |
950 | ret = security_xfrm_policy_lookup(pol->security, fl->secid, |
951 | dir); | |
2518c7c2 | 952 | |
134b0fc5 | 953 | return ret; |
2518c7c2 | 954 | } |
1da177e4 | 955 | |
2518c7c2 DM |
956 | static struct xfrm_policy *xfrm_policy_lookup_bytype(u8 type, struct flowi *fl, |
957 | u16 family, u8 dir) | |
958 | { | |
134b0fc5 | 959 | int err; |
2518c7c2 DM |
960 | struct xfrm_policy *pol, *ret; |
961 | xfrm_address_t *daddr, *saddr; | |
962 | struct hlist_node *entry; | |
963 | struct hlist_head *chain; | |
acba48e1 | 964 | u32 priority = ~0U; |
df71837d | 965 | |
2518c7c2 DM |
966 | daddr = xfrm_flowi_daddr(fl, family); |
967 | saddr = xfrm_flowi_saddr(fl, family); | |
968 | if (unlikely(!daddr || !saddr)) | |
969 | return NULL; | |
970 | ||
971 | read_lock_bh(&xfrm_policy_lock); | |
972 | chain = policy_hash_direct(daddr, saddr, family, dir); | |
973 | ret = NULL; | |
974 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
975 | err = xfrm_policy_match(pol, fl, type, family, dir); |
976 | if (err) { | |
977 | if (err == -ESRCH) | |
978 | continue; | |
979 | else { | |
980 | ret = ERR_PTR(err); | |
981 | goto fail; | |
982 | } | |
983 | } else { | |
2518c7c2 | 984 | ret = pol; |
acba48e1 | 985 | priority = ret->priority; |
2518c7c2 DM |
986 | break; |
987 | } | |
988 | } | |
acba48e1 DM |
989 | chain = &xfrm_policy_inexact[dir]; |
990 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
991 | err = xfrm_policy_match(pol, fl, type, family, dir); |
992 | if (err) { | |
993 | if (err == -ESRCH) | |
994 | continue; | |
995 | else { | |
996 | ret = ERR_PTR(err); | |
997 | goto fail; | |
998 | } | |
999 | } else if (pol->priority < priority) { | |
acba48e1 DM |
1000 | ret = pol; |
1001 | break; | |
1da177e4 LT |
1002 | } |
1003 | } | |
acba48e1 DM |
1004 | if (ret) |
1005 | xfrm_pol_hold(ret); | |
134b0fc5 | 1006 | fail: |
1da177e4 | 1007 | read_unlock_bh(&xfrm_policy_lock); |
4e81bb83 | 1008 | |
2518c7c2 | 1009 | return ret; |
4e81bb83 MN |
1010 | } |
1011 | ||
134b0fc5 | 1012 | static int xfrm_policy_lookup(struct flowi *fl, u16 family, u8 dir, |
4e81bb83 MN |
1013 | void **objp, atomic_t **obj_refp) |
1014 | { | |
1015 | struct xfrm_policy *pol; | |
134b0fc5 | 1016 | int err = 0; |
4e81bb83 MN |
1017 | |
1018 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1019 | pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_SUB, fl, family, dir); | |
134b0fc5 JM |
1020 | if (IS_ERR(pol)) { |
1021 | err = PTR_ERR(pol); | |
1022 | pol = NULL; | |
1023 | } | |
1024 | if (pol || err) | |
4e81bb83 MN |
1025 | goto end; |
1026 | #endif | |
1027 | pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, fl, family, dir); | |
134b0fc5 JM |
1028 | if (IS_ERR(pol)) { |
1029 | err = PTR_ERR(pol); | |
1030 | pol = NULL; | |
1031 | } | |
4e81bb83 | 1032 | #ifdef CONFIG_XFRM_SUB_POLICY |
2518c7c2 | 1033 | end: |
4e81bb83 | 1034 | #endif |
1da177e4 LT |
1035 | if ((*objp = (void *) pol) != NULL) |
1036 | *obj_refp = &pol->refcnt; | |
134b0fc5 | 1037 | return err; |
1da177e4 LT |
1038 | } |
1039 | ||
df71837d TJ |
1040 | static inline int policy_to_flow_dir(int dir) |
1041 | { | |
1042 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
a716c119 YH |
1043 | XFRM_POLICY_OUT == FLOW_DIR_OUT && |
1044 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
1045 | return dir; | |
1046 | switch (dir) { | |
1047 | default: | |
1048 | case XFRM_POLICY_IN: | |
1049 | return FLOW_DIR_IN; | |
1050 | case XFRM_POLICY_OUT: | |
1051 | return FLOW_DIR_OUT; | |
1052 | case XFRM_POLICY_FWD: | |
1053 | return FLOW_DIR_FWD; | |
3ff50b79 | 1054 | } |
df71837d TJ |
1055 | } |
1056 | ||
e0d1caa7 | 1057 | static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl) |
1da177e4 LT |
1058 | { |
1059 | struct xfrm_policy *pol; | |
1060 | ||
1061 | read_lock_bh(&xfrm_policy_lock); | |
1062 | if ((pol = sk->sk_policy[dir]) != NULL) { | |
a716c119 | 1063 | int match = xfrm_selector_match(&pol->selector, fl, |
1da177e4 | 1064 | sk->sk_family); |
a716c119 | 1065 | int err = 0; |
df71837d | 1066 | |
3bccfbc7 | 1067 | if (match) { |
03e1ad7b PM |
1068 | err = security_xfrm_policy_lookup(pol->security, |
1069 | fl->secid, | |
1070 | policy_to_flow_dir(dir)); | |
3bccfbc7 VY |
1071 | if (!err) |
1072 | xfrm_pol_hold(pol); | |
1073 | else if (err == -ESRCH) | |
1074 | pol = NULL; | |
1075 | else | |
1076 | pol = ERR_PTR(err); | |
1077 | } else | |
1da177e4 LT |
1078 | pol = NULL; |
1079 | } | |
1080 | read_unlock_bh(&xfrm_policy_lock); | |
1081 | return pol; | |
1082 | } | |
1083 | ||
1084 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) | |
1085 | { | |
2518c7c2 DM |
1086 | struct hlist_head *chain = policy_hash_bysel(&pol->selector, |
1087 | pol->family, dir); | |
4e81bb83 | 1088 | |
12a169e7 | 1089 | list_add(&pol->walk.all, &xfrm_policy_all); |
2518c7c2 DM |
1090 | hlist_add_head(&pol->bydst, chain); |
1091 | hlist_add_head(&pol->byidx, xfrm_policy_byidx+idx_hash(pol->index)); | |
1092 | xfrm_policy_count[dir]++; | |
1da177e4 | 1093 | xfrm_pol_hold(pol); |
2518c7c2 DM |
1094 | |
1095 | if (xfrm_bydst_should_resize(dir, NULL)) | |
1096 | schedule_work(&xfrm_hash_work); | |
1da177e4 LT |
1097 | } |
1098 | ||
1099 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, | |
1100 | int dir) | |
1101 | { | |
2518c7c2 DM |
1102 | if (hlist_unhashed(&pol->bydst)) |
1103 | return NULL; | |
1da177e4 | 1104 | |
2518c7c2 DM |
1105 | hlist_del(&pol->bydst); |
1106 | hlist_del(&pol->byidx); | |
12a169e7 | 1107 | list_del(&pol->walk.all); |
2518c7c2 DM |
1108 | xfrm_policy_count[dir]--; |
1109 | ||
1110 | return pol; | |
1da177e4 LT |
1111 | } |
1112 | ||
4666faab | 1113 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir) |
1da177e4 LT |
1114 | { |
1115 | write_lock_bh(&xfrm_policy_lock); | |
1116 | pol = __xfrm_policy_unlink(pol, dir); | |
1117 | write_unlock_bh(&xfrm_policy_lock); | |
1118 | if (pol) { | |
1119 | if (dir < XFRM_POLICY_MAX) | |
1120 | atomic_inc(&flow_cache_genid); | |
1121 | xfrm_policy_kill(pol); | |
4666faab | 1122 | return 0; |
1da177e4 | 1123 | } |
4666faab | 1124 | return -ENOENT; |
1da177e4 | 1125 | } |
a70fcb0b | 1126 | EXPORT_SYMBOL(xfrm_policy_delete); |
1da177e4 LT |
1127 | |
1128 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) | |
1129 | { | |
1130 | struct xfrm_policy *old_pol; | |
1131 | ||
4e81bb83 MN |
1132 | #ifdef CONFIG_XFRM_SUB_POLICY |
1133 | if (pol && pol->type != XFRM_POLICY_TYPE_MAIN) | |
1134 | return -EINVAL; | |
1135 | #endif | |
1136 | ||
1da177e4 LT |
1137 | write_lock_bh(&xfrm_policy_lock); |
1138 | old_pol = sk->sk_policy[dir]; | |
1139 | sk->sk_policy[dir] = pol; | |
1140 | if (pol) { | |
9d729f72 | 1141 | pol->curlft.add_time = get_seconds(); |
7a12122c | 1142 | pol->index = xfrm_gen_index(XFRM_POLICY_MAX+dir); |
1da177e4 LT |
1143 | __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir); |
1144 | } | |
1145 | if (old_pol) | |
1146 | __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir); | |
1147 | write_unlock_bh(&xfrm_policy_lock); | |
1148 | ||
1149 | if (old_pol) { | |
1150 | xfrm_policy_kill(old_pol); | |
1151 | } | |
1152 | return 0; | |
1153 | } | |
1154 | ||
1155 | static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir) | |
1156 | { | |
0331b1f3 | 1157 | struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC); |
1da177e4 LT |
1158 | |
1159 | if (newp) { | |
1160 | newp->selector = old->selector; | |
03e1ad7b PM |
1161 | if (security_xfrm_policy_clone(old->security, |
1162 | &newp->security)) { | |
df71837d TJ |
1163 | kfree(newp); |
1164 | return NULL; /* ENOMEM */ | |
1165 | } | |
1da177e4 LT |
1166 | newp->lft = old->lft; |
1167 | newp->curlft = old->curlft; | |
1168 | newp->action = old->action; | |
1169 | newp->flags = old->flags; | |
1170 | newp->xfrm_nr = old->xfrm_nr; | |
1171 | newp->index = old->index; | |
4e81bb83 | 1172 | newp->type = old->type; |
1da177e4 LT |
1173 | memcpy(newp->xfrm_vec, old->xfrm_vec, |
1174 | newp->xfrm_nr*sizeof(struct xfrm_tmpl)); | |
1175 | write_lock_bh(&xfrm_policy_lock); | |
1176 | __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir); | |
1177 | write_unlock_bh(&xfrm_policy_lock); | |
1178 | xfrm_pol_put(newp); | |
1179 | } | |
1180 | return newp; | |
1181 | } | |
1182 | ||
1183 | int __xfrm_sk_clone_policy(struct sock *sk) | |
1184 | { | |
1185 | struct xfrm_policy *p0 = sk->sk_policy[0], | |
1186 | *p1 = sk->sk_policy[1]; | |
1187 | ||
1188 | sk->sk_policy[0] = sk->sk_policy[1] = NULL; | |
1189 | if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL) | |
1190 | return -ENOMEM; | |
1191 | if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL) | |
1192 | return -ENOMEM; | |
1193 | return 0; | |
1194 | } | |
1195 | ||
a1e59abf PM |
1196 | static int |
1197 | xfrm_get_saddr(xfrm_address_t *local, xfrm_address_t *remote, | |
1198 | unsigned short family) | |
1199 | { | |
1200 | int err; | |
1201 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1202 | ||
1203 | if (unlikely(afinfo == NULL)) | |
1204 | return -EINVAL; | |
1205 | err = afinfo->get_saddr(local, remote); | |
1206 | xfrm_policy_put_afinfo(afinfo); | |
1207 | return err; | |
1208 | } | |
1209 | ||
1da177e4 LT |
1210 | /* Resolve list of templates for the flow, given policy. */ |
1211 | ||
1212 | static int | |
4e81bb83 MN |
1213 | xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl, |
1214 | struct xfrm_state **xfrm, | |
1215 | unsigned short family) | |
1da177e4 LT |
1216 | { |
1217 | int nx; | |
1218 | int i, error; | |
1219 | xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); | |
1220 | xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); | |
a1e59abf | 1221 | xfrm_address_t tmp; |
1da177e4 LT |
1222 | |
1223 | for (nx=0, i = 0; i < policy->xfrm_nr; i++) { | |
1224 | struct xfrm_state *x; | |
1225 | xfrm_address_t *remote = daddr; | |
1226 | xfrm_address_t *local = saddr; | |
1227 | struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; | |
1228 | ||
48b8d783 JK |
1229 | if (tmpl->mode == XFRM_MODE_TUNNEL || |
1230 | tmpl->mode == XFRM_MODE_BEET) { | |
1da177e4 LT |
1231 | remote = &tmpl->id.daddr; |
1232 | local = &tmpl->saddr; | |
76b3f055 | 1233 | family = tmpl->encap_family; |
a1e59abf PM |
1234 | if (xfrm_addr_any(local, family)) { |
1235 | error = xfrm_get_saddr(&tmp, remote, family); | |
1236 | if (error) | |
1237 | goto fail; | |
1238 | local = &tmp; | |
1239 | } | |
1da177e4 LT |
1240 | } |
1241 | ||
1242 | x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); | |
1243 | ||
1244 | if (x && x->km.state == XFRM_STATE_VALID) { | |
1245 | xfrm[nx++] = x; | |
1246 | daddr = remote; | |
1247 | saddr = local; | |
1248 | continue; | |
1249 | } | |
1250 | if (x) { | |
1251 | error = (x->km.state == XFRM_STATE_ERROR ? | |
1252 | -EINVAL : -EAGAIN); | |
1253 | xfrm_state_put(x); | |
1254 | } | |
a4322266 | 1255 | else if (error == -ESRCH) |
1256 | error = -EAGAIN; | |
1da177e4 LT |
1257 | |
1258 | if (!tmpl->optional) | |
1259 | goto fail; | |
1260 | } | |
1261 | return nx; | |
1262 | ||
1263 | fail: | |
1264 | for (nx--; nx>=0; nx--) | |
1265 | xfrm_state_put(xfrm[nx]); | |
1266 | return error; | |
1267 | } | |
1268 | ||
4e81bb83 MN |
1269 | static int |
1270 | xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl, | |
1271 | struct xfrm_state **xfrm, | |
1272 | unsigned short family) | |
1273 | { | |
41a49cc3 MN |
1274 | struct xfrm_state *tp[XFRM_MAX_DEPTH]; |
1275 | struct xfrm_state **tpp = (npols > 1) ? tp : xfrm; | |
4e81bb83 MN |
1276 | int cnx = 0; |
1277 | int error; | |
1278 | int ret; | |
1279 | int i; | |
1280 | ||
1281 | for (i = 0; i < npols; i++) { | |
1282 | if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
1283 | error = -ENOBUFS; | |
1284 | goto fail; | |
1285 | } | |
41a49cc3 MN |
1286 | |
1287 | ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family); | |
4e81bb83 MN |
1288 | if (ret < 0) { |
1289 | error = ret; | |
1290 | goto fail; | |
1291 | } else | |
1292 | cnx += ret; | |
1293 | } | |
1294 | ||
41a49cc3 MN |
1295 | /* found states are sorted for outbound processing */ |
1296 | if (npols > 1) | |
1297 | xfrm_state_sort(xfrm, tpp, cnx, family); | |
1298 | ||
4e81bb83 MN |
1299 | return cnx; |
1300 | ||
1301 | fail: | |
1302 | for (cnx--; cnx>=0; cnx--) | |
41a49cc3 | 1303 | xfrm_state_put(tpp[cnx]); |
4e81bb83 MN |
1304 | return error; |
1305 | ||
1306 | } | |
1307 | ||
1da177e4 LT |
1308 | /* Check that the bundle accepts the flow and its components are |
1309 | * still valid. | |
1310 | */ | |
1311 | ||
1312 | static struct dst_entry * | |
1313 | xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short family) | |
1314 | { | |
1315 | struct dst_entry *x; | |
1316 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1317 | if (unlikely(afinfo == NULL)) | |
1318 | return ERR_PTR(-EINVAL); | |
1319 | x = afinfo->find_bundle(fl, policy); | |
1320 | xfrm_policy_put_afinfo(afinfo); | |
1321 | return x; | |
1322 | } | |
1323 | ||
25ee3286 HX |
1324 | static inline int xfrm_get_tos(struct flowi *fl, int family) |
1325 | { | |
1326 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1327 | int tos; | |
1da177e4 | 1328 | |
25ee3286 HX |
1329 | if (!afinfo) |
1330 | return -EINVAL; | |
1331 | ||
1332 | tos = afinfo->get_tos(fl); | |
1333 | ||
1334 | xfrm_policy_put_afinfo(afinfo); | |
1335 | ||
1336 | return tos; | |
1337 | } | |
1338 | ||
1339 | static inline struct xfrm_dst *xfrm_alloc_dst(int family) | |
1da177e4 | 1340 | { |
1da177e4 | 1341 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
25ee3286 HX |
1342 | struct xfrm_dst *xdst; |
1343 | ||
1344 | if (!afinfo) | |
1345 | return ERR_PTR(-EINVAL); | |
1346 | ||
1347 | xdst = dst_alloc(afinfo->dst_ops) ?: ERR_PTR(-ENOBUFS); | |
1348 | ||
1349 | xfrm_policy_put_afinfo(afinfo); | |
1350 | ||
1351 | return xdst; | |
1352 | } | |
1353 | ||
a1b05140 MN |
1354 | static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst, |
1355 | int nfheader_len) | |
1356 | { | |
1357 | struct xfrm_policy_afinfo *afinfo = | |
1358 | xfrm_policy_get_afinfo(dst->ops->family); | |
1359 | int err; | |
1360 | ||
1361 | if (!afinfo) | |
1362 | return -EINVAL; | |
1363 | ||
1364 | err = afinfo->init_path(path, dst, nfheader_len); | |
1365 | ||
1366 | xfrm_policy_put_afinfo(afinfo); | |
1367 | ||
1368 | return err; | |
1369 | } | |
1370 | ||
25ee3286 HX |
1371 | static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev) |
1372 | { | |
1373 | struct xfrm_policy_afinfo *afinfo = | |
1374 | xfrm_policy_get_afinfo(xdst->u.dst.ops->family); | |
1375 | int err; | |
1376 | ||
1377 | if (!afinfo) | |
1da177e4 | 1378 | return -EINVAL; |
25ee3286 HX |
1379 | |
1380 | err = afinfo->fill_dst(xdst, dev); | |
1381 | ||
1da177e4 | 1382 | xfrm_policy_put_afinfo(afinfo); |
25ee3286 | 1383 | |
1da177e4 LT |
1384 | return err; |
1385 | } | |
1386 | ||
25ee3286 HX |
1387 | /* Allocate chain of dst_entry's, attach known xfrm's, calculate |
1388 | * all the metrics... Shortly, bundle a bundle. | |
1389 | */ | |
1390 | ||
1391 | static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy, | |
1392 | struct xfrm_state **xfrm, int nx, | |
1393 | struct flowi *fl, | |
1394 | struct dst_entry *dst) | |
1395 | { | |
1396 | unsigned long now = jiffies; | |
1397 | struct net_device *dev; | |
1398 | struct dst_entry *dst_prev = NULL; | |
1399 | struct dst_entry *dst0 = NULL; | |
1400 | int i = 0; | |
1401 | int err; | |
1402 | int header_len = 0; | |
a1b05140 | 1403 | int nfheader_len = 0; |
25ee3286 HX |
1404 | int trailer_len = 0; |
1405 | int tos; | |
1406 | int family = policy->selector.family; | |
9bb182a7 YH |
1407 | xfrm_address_t saddr, daddr; |
1408 | ||
1409 | xfrm_flowi_addr_get(fl, &saddr, &daddr, family); | |
25ee3286 HX |
1410 | |
1411 | tos = xfrm_get_tos(fl, family); | |
1412 | err = tos; | |
1413 | if (tos < 0) | |
1414 | goto put_states; | |
1415 | ||
1416 | dst_hold(dst); | |
1417 | ||
1418 | for (; i < nx; i++) { | |
1419 | struct xfrm_dst *xdst = xfrm_alloc_dst(family); | |
1420 | struct dst_entry *dst1 = &xdst->u.dst; | |
1421 | ||
1422 | err = PTR_ERR(xdst); | |
1423 | if (IS_ERR(xdst)) { | |
1424 | dst_release(dst); | |
1425 | goto put_states; | |
1426 | } | |
1427 | ||
1428 | if (!dst_prev) | |
1429 | dst0 = dst1; | |
1430 | else { | |
1431 | dst_prev->child = dst_clone(dst1); | |
1432 | dst1->flags |= DST_NOHASH; | |
1433 | } | |
1434 | ||
1435 | xdst->route = dst; | |
1436 | memcpy(&dst1->metrics, &dst->metrics, sizeof(dst->metrics)); | |
1437 | ||
1438 | if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) { | |
1439 | family = xfrm[i]->props.family; | |
9bb182a7 YH |
1440 | dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr, |
1441 | family); | |
25ee3286 HX |
1442 | err = PTR_ERR(dst); |
1443 | if (IS_ERR(dst)) | |
1444 | goto put_states; | |
1445 | } else | |
1446 | dst_hold(dst); | |
1447 | ||
1448 | dst1->xfrm = xfrm[i]; | |
1449 | xdst->genid = xfrm[i]->genid; | |
1450 | ||
1451 | dst1->obsolete = -1; | |
1452 | dst1->flags |= DST_HOST; | |
1453 | dst1->lastuse = now; | |
1454 | ||
1455 | dst1->input = dst_discard; | |
1456 | dst1->output = xfrm[i]->outer_mode->afinfo->output; | |
1457 | ||
1458 | dst1->next = dst_prev; | |
1459 | dst_prev = dst1; | |
1460 | ||
1461 | header_len += xfrm[i]->props.header_len; | |
a1b05140 MN |
1462 | if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT) |
1463 | nfheader_len += xfrm[i]->props.header_len; | |
25ee3286 HX |
1464 | trailer_len += xfrm[i]->props.trailer_len; |
1465 | } | |
1466 | ||
1467 | dst_prev->child = dst; | |
1468 | dst0->path = dst; | |
1469 | ||
1470 | err = -ENODEV; | |
1471 | dev = dst->dev; | |
1472 | if (!dev) | |
1473 | goto free_dst; | |
1474 | ||
1475 | /* Copy neighbout for reachability confirmation */ | |
1476 | dst0->neighbour = neigh_clone(dst->neighbour); | |
1477 | ||
a1b05140 | 1478 | xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len); |
25ee3286 HX |
1479 | xfrm_init_pmtu(dst_prev); |
1480 | ||
1481 | for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) { | |
1482 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev; | |
1483 | ||
1484 | err = xfrm_fill_dst(xdst, dev); | |
1485 | if (err) | |
1486 | goto free_dst; | |
1487 | ||
1488 | dst_prev->header_len = header_len; | |
1489 | dst_prev->trailer_len = trailer_len; | |
1490 | header_len -= xdst->u.dst.xfrm->props.header_len; | |
1491 | trailer_len -= xdst->u.dst.xfrm->props.trailer_len; | |
1492 | } | |
1493 | ||
1494 | out: | |
1495 | return dst0; | |
1496 | ||
1497 | put_states: | |
1498 | for (; i < nx; i++) | |
1499 | xfrm_state_put(xfrm[i]); | |
1500 | free_dst: | |
1501 | if (dst0) | |
1502 | dst_free(dst0); | |
1503 | dst0 = ERR_PTR(err); | |
1504 | goto out; | |
1505 | } | |
1506 | ||
157bfc25 MN |
1507 | static int inline |
1508 | xfrm_dst_alloc_copy(void **target, void *src, int size) | |
1509 | { | |
1510 | if (!*target) { | |
1511 | *target = kmalloc(size, GFP_ATOMIC); | |
1512 | if (!*target) | |
1513 | return -ENOMEM; | |
1514 | } | |
1515 | memcpy(*target, src, size); | |
1516 | return 0; | |
1517 | } | |
1518 | ||
1519 | static int inline | |
1520 | xfrm_dst_update_parent(struct dst_entry *dst, struct xfrm_selector *sel) | |
1521 | { | |
1522 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1523 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1524 | return xfrm_dst_alloc_copy((void **)&(xdst->partner), | |
1525 | sel, sizeof(*sel)); | |
1526 | #else | |
1527 | return 0; | |
1528 | #endif | |
1529 | } | |
1530 | ||
1531 | static int inline | |
1532 | xfrm_dst_update_origin(struct dst_entry *dst, struct flowi *fl) | |
1533 | { | |
1534 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1535 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1536 | return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl)); | |
1537 | #else | |
1538 | return 0; | |
1539 | #endif | |
1540 | } | |
1da177e4 LT |
1541 | |
1542 | static int stale_bundle(struct dst_entry *dst); | |
1543 | ||
1544 | /* Main function: finds/creates a bundle for given flow. | |
1545 | * | |
1546 | * At the moment we eat a raw IP route. Mostly to speed up lookups | |
1547 | * on interfaces with disabled IPsec. | |
1548 | */ | |
14e50e57 DM |
1549 | int __xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl, |
1550 | struct sock *sk, int flags) | |
1da177e4 LT |
1551 | { |
1552 | struct xfrm_policy *policy; | |
4e81bb83 MN |
1553 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
1554 | int npols; | |
1555 | int pol_dead; | |
1556 | int xfrm_nr; | |
1557 | int pi; | |
1da177e4 LT |
1558 | struct xfrm_state *xfrm[XFRM_MAX_DEPTH]; |
1559 | struct dst_entry *dst, *dst_orig = *dst_p; | |
1560 | int nx = 0; | |
1561 | int err; | |
1562 | u32 genid; | |
42cf93cd | 1563 | u16 family; |
df71837d | 1564 | u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT); |
e0d1caa7 | 1565 | |
1da177e4 LT |
1566 | restart: |
1567 | genid = atomic_read(&flow_cache_genid); | |
1568 | policy = NULL; | |
4e81bb83 MN |
1569 | for (pi = 0; pi < ARRAY_SIZE(pols); pi++) |
1570 | pols[pi] = NULL; | |
1571 | npols = 0; | |
1572 | pol_dead = 0; | |
1573 | xfrm_nr = 0; | |
1574 | ||
f7944fb1 | 1575 | if (sk && sk->sk_policy[XFRM_POLICY_OUT]) { |
e0d1caa7 | 1576 | policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl); |
75b8c133 | 1577 | err = PTR_ERR(policy); |
0aa64774 MN |
1578 | if (IS_ERR(policy)) { |
1579 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLERROR); | |
75b8c133 | 1580 | goto dropdst; |
0aa64774 | 1581 | } |
3bccfbc7 | 1582 | } |
1da177e4 LT |
1583 | |
1584 | if (!policy) { | |
1585 | /* To accelerate a bit... */ | |
2518c7c2 DM |
1586 | if ((dst_orig->flags & DST_NOXFRM) || |
1587 | !xfrm_policy_count[XFRM_POLICY_OUT]) | |
8b7817f3 | 1588 | goto nopol; |
1da177e4 | 1589 | |
e0d1caa7 | 1590 | policy = flow_cache_lookup(fl, dst_orig->ops->family, |
42cf93cd | 1591 | dir, xfrm_policy_lookup); |
75b8c133 | 1592 | err = PTR_ERR(policy); |
d66e37a9 MN |
1593 | if (IS_ERR(policy)) { |
1594 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLERROR); | |
75b8c133 | 1595 | goto dropdst; |
d66e37a9 | 1596 | } |
1da177e4 LT |
1597 | } |
1598 | ||
1599 | if (!policy) | |
8b7817f3 | 1600 | goto nopol; |
1da177e4 | 1601 | |
42cf93cd | 1602 | family = dst_orig->ops->family; |
4e81bb83 MN |
1603 | pols[0] = policy; |
1604 | npols ++; | |
1605 | xfrm_nr += pols[0]->xfrm_nr; | |
1da177e4 | 1606 | |
aef21785 | 1607 | err = -ENOENT; |
8b7817f3 HX |
1608 | if ((flags & XFRM_LOOKUP_ICMP) && !(policy->flags & XFRM_POLICY_ICMP)) |
1609 | goto error; | |
1610 | ||
1611 | policy->curlft.use_time = get_seconds(); | |
1612 | ||
1da177e4 | 1613 | switch (policy->action) { |
5e5234ff | 1614 | default: |
1da177e4 LT |
1615 | case XFRM_POLICY_BLOCK: |
1616 | /* Prohibit the flow */ | |
0aa64774 | 1617 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLBLOCK); |
e104411b PM |
1618 | err = -EPERM; |
1619 | goto error; | |
1da177e4 LT |
1620 | |
1621 | case XFRM_POLICY_ALLOW: | |
4e81bb83 | 1622 | #ifndef CONFIG_XFRM_SUB_POLICY |
1da177e4 LT |
1623 | if (policy->xfrm_nr == 0) { |
1624 | /* Flow passes not transformed. */ | |
1625 | xfrm_pol_put(policy); | |
1626 | return 0; | |
1627 | } | |
4e81bb83 | 1628 | #endif |
1da177e4 LT |
1629 | |
1630 | /* Try to find matching bundle. | |
1631 | * | |
1632 | * LATER: help from flow cache. It is optional, this | |
1633 | * is required only for output policy. | |
1634 | */ | |
1635 | dst = xfrm_find_bundle(fl, policy, family); | |
1636 | if (IS_ERR(dst)) { | |
0aa64774 | 1637 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR); |
e104411b PM |
1638 | err = PTR_ERR(dst); |
1639 | goto error; | |
1da177e4 LT |
1640 | } |
1641 | ||
1642 | if (dst) | |
1643 | break; | |
1644 | ||
4e81bb83 MN |
1645 | #ifdef CONFIG_XFRM_SUB_POLICY |
1646 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1647 | pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, | |
1648 | fl, family, | |
1649 | XFRM_POLICY_OUT); | |
1650 | if (pols[1]) { | |
134b0fc5 | 1651 | if (IS_ERR(pols[1])) { |
0aa64774 | 1652 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLERROR); |
134b0fc5 JM |
1653 | err = PTR_ERR(pols[1]); |
1654 | goto error; | |
1655 | } | |
4e81bb83 | 1656 | if (pols[1]->action == XFRM_POLICY_BLOCK) { |
0aa64774 | 1657 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLBLOCK); |
4e81bb83 MN |
1658 | err = -EPERM; |
1659 | goto error; | |
1660 | } | |
1661 | npols ++; | |
1662 | xfrm_nr += pols[1]->xfrm_nr; | |
1663 | } | |
1664 | } | |
1665 | ||
1666 | /* | |
1667 | * Because neither flowi nor bundle information knows about | |
1668 | * transformation template size. On more than one policy usage | |
1669 | * we can realize whether all of them is bypass or not after | |
1670 | * they are searched. See above not-transformed bypass | |
1671 | * is surrounded by non-sub policy configuration, too. | |
1672 | */ | |
1673 | if (xfrm_nr == 0) { | |
1674 | /* Flow passes not transformed. */ | |
1675 | xfrm_pols_put(pols, npols); | |
1676 | return 0; | |
1677 | } | |
1678 | ||
1679 | #endif | |
1680 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); | |
1da177e4 LT |
1681 | |
1682 | if (unlikely(nx<0)) { | |
1683 | err = nx; | |
14e50e57 DM |
1684 | if (err == -EAGAIN && sysctl_xfrm_larval_drop) { |
1685 | /* EREMOTE tells the caller to generate | |
1686 | * a one-shot blackhole route. | |
1687 | */ | |
d66e37a9 | 1688 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES); |
14e50e57 DM |
1689 | xfrm_pol_put(policy); |
1690 | return -EREMOTE; | |
1691 | } | |
815f4e57 | 1692 | if (err == -EAGAIN && (flags & XFRM_LOOKUP_WAIT)) { |
1da177e4 LT |
1693 | DECLARE_WAITQUEUE(wait, current); |
1694 | ||
50a30657 | 1695 | add_wait_queue(&init_net.xfrm.km_waitq, &wait); |
1da177e4 LT |
1696 | set_current_state(TASK_INTERRUPTIBLE); |
1697 | schedule(); | |
1698 | set_current_state(TASK_RUNNING); | |
50a30657 | 1699 | remove_wait_queue(&init_net.xfrm.km_waitq, &wait); |
1da177e4 | 1700 | |
4e81bb83 | 1701 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); |
1da177e4 LT |
1702 | |
1703 | if (nx == -EAGAIN && signal_pending(current)) { | |
0aa64774 | 1704 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES); |
1da177e4 LT |
1705 | err = -ERESTART; |
1706 | goto error; | |
1707 | } | |
1708 | if (nx == -EAGAIN || | |
1709 | genid != atomic_read(&flow_cache_genid)) { | |
4e81bb83 | 1710 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1711 | goto restart; |
1712 | } | |
1713 | err = nx; | |
1714 | } | |
0aa64774 MN |
1715 | if (err < 0) { |
1716 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES); | |
1da177e4 | 1717 | goto error; |
0aa64774 | 1718 | } |
1da177e4 LT |
1719 | } |
1720 | if (nx == 0) { | |
1721 | /* Flow passes not transformed. */ | |
4e81bb83 | 1722 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1723 | return 0; |
1724 | } | |
1725 | ||
25ee3286 HX |
1726 | dst = xfrm_bundle_create(policy, xfrm, nx, fl, dst_orig); |
1727 | err = PTR_ERR(dst); | |
0aa64774 MN |
1728 | if (IS_ERR(dst)) { |
1729 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLEGENERROR); | |
1da177e4 | 1730 | goto error; |
0aa64774 | 1731 | } |
1da177e4 | 1732 | |
4e81bb83 MN |
1733 | for (pi = 0; pi < npols; pi++) { |
1734 | read_lock_bh(&pols[pi]->lock); | |
12a169e7 | 1735 | pol_dead |= pols[pi]->walk.dead; |
4e81bb83 MN |
1736 | read_unlock_bh(&pols[pi]->lock); |
1737 | } | |
1738 | ||
1da177e4 | 1739 | write_lock_bh(&policy->lock); |
4e81bb83 | 1740 | if (unlikely(pol_dead || stale_bundle(dst))) { |
1da177e4 LT |
1741 | /* Wow! While we worked on resolving, this |
1742 | * policy has gone. Retry. It is not paranoia, | |
1743 | * we just cannot enlist new bundle to dead object. | |
1744 | * We can't enlist stable bundles either. | |
1745 | */ | |
1746 | write_unlock_bh(&policy->lock); | |
9d7d7402 | 1747 | dst_free(dst); |
00de651d | 1748 | |
0aa64774 MN |
1749 | if (pol_dead) |
1750 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLDEAD); | |
1751 | else | |
1752 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR); | |
00de651d HX |
1753 | err = -EHOSTUNREACH; |
1754 | goto error; | |
1da177e4 | 1755 | } |
157bfc25 MN |
1756 | |
1757 | if (npols > 1) | |
1758 | err = xfrm_dst_update_parent(dst, &pols[1]->selector); | |
1759 | else | |
1760 | err = xfrm_dst_update_origin(dst, fl); | |
1761 | if (unlikely(err)) { | |
1762 | write_unlock_bh(&policy->lock); | |
9d7d7402 | 1763 | dst_free(dst); |
0aa64774 | 1764 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR); |
157bfc25 MN |
1765 | goto error; |
1766 | } | |
1767 | ||
1da177e4 LT |
1768 | dst->next = policy->bundles; |
1769 | policy->bundles = dst; | |
1770 | dst_hold(dst); | |
1771 | write_unlock_bh(&policy->lock); | |
1772 | } | |
1773 | *dst_p = dst; | |
1774 | dst_release(dst_orig); | |
a716c119 | 1775 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1776 | return 0; |
1777 | ||
1778 | error: | |
4e81bb83 | 1779 | xfrm_pols_put(pols, npols); |
75b8c133 HX |
1780 | dropdst: |
1781 | dst_release(dst_orig); | |
1da177e4 LT |
1782 | *dst_p = NULL; |
1783 | return err; | |
8b7817f3 HX |
1784 | |
1785 | nopol: | |
aef21785 | 1786 | err = -ENOENT; |
8b7817f3 HX |
1787 | if (flags & XFRM_LOOKUP_ICMP) |
1788 | goto dropdst; | |
1789 | return 0; | |
1da177e4 | 1790 | } |
14e50e57 DM |
1791 | EXPORT_SYMBOL(__xfrm_lookup); |
1792 | ||
1793 | int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl, | |
1794 | struct sock *sk, int flags) | |
1795 | { | |
1796 | int err = __xfrm_lookup(dst_p, fl, sk, flags); | |
1797 | ||
1798 | if (err == -EREMOTE) { | |
1799 | dst_release(*dst_p); | |
1800 | *dst_p = NULL; | |
1801 | err = -EAGAIN; | |
1802 | } | |
1803 | ||
1804 | return err; | |
1805 | } | |
1da177e4 LT |
1806 | EXPORT_SYMBOL(xfrm_lookup); |
1807 | ||
df0ba92a MN |
1808 | static inline int |
1809 | xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl) | |
1810 | { | |
1811 | struct xfrm_state *x; | |
df0ba92a MN |
1812 | |
1813 | if (!skb->sp || idx < 0 || idx >= skb->sp->len) | |
1814 | return 0; | |
1815 | x = skb->sp->xvec[idx]; | |
1816 | if (!x->type->reject) | |
1817 | return 0; | |
1ecafede | 1818 | return x->type->reject(x, skb, fl); |
df0ba92a MN |
1819 | } |
1820 | ||
1da177e4 LT |
1821 | /* When skb is transformed back to its "native" form, we have to |
1822 | * check policy restrictions. At the moment we make this in maximally | |
1823 | * stupid way. Shame on me. :-) Of course, connected sockets must | |
1824 | * have policy cached at them. | |
1825 | */ | |
1826 | ||
1827 | static inline int | |
a716c119 | 1828 | xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x, |
1da177e4 LT |
1829 | unsigned short family) |
1830 | { | |
1831 | if (xfrm_state_kern(x)) | |
928ba416 | 1832 | return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family); |
1da177e4 LT |
1833 | return x->id.proto == tmpl->id.proto && |
1834 | (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && | |
1835 | (x->props.reqid == tmpl->reqid || !tmpl->reqid) && | |
1836 | x->props.mode == tmpl->mode && | |
c5d18e98 | 1837 | (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) || |
f3bd4840 | 1838 | !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) && |
7e49e6de MN |
1839 | !(x->props.mode != XFRM_MODE_TRANSPORT && |
1840 | xfrm_state_addr_cmp(tmpl, x, family)); | |
1da177e4 LT |
1841 | } |
1842 | ||
df0ba92a MN |
1843 | /* |
1844 | * 0 or more than 0 is returned when validation is succeeded (either bypass | |
1845 | * because of optional transport mode, or next index of the mathced secpath | |
1846 | * state with the template. | |
1847 | * -1 is returned when no matching template is found. | |
1848 | * Otherwise "-2 - errored_index" is returned. | |
1849 | */ | |
1da177e4 LT |
1850 | static inline int |
1851 | xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start, | |
1852 | unsigned short family) | |
1853 | { | |
1854 | int idx = start; | |
1855 | ||
1856 | if (tmpl->optional) { | |
7e49e6de | 1857 | if (tmpl->mode == XFRM_MODE_TRANSPORT) |
1da177e4 LT |
1858 | return start; |
1859 | } else | |
1860 | start = -1; | |
1861 | for (; idx < sp->len; idx++) { | |
dbe5b4aa | 1862 | if (xfrm_state_ok(tmpl, sp->xvec[idx], family)) |
1da177e4 | 1863 | return ++idx; |
df0ba92a MN |
1864 | if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) { |
1865 | if (start == -1) | |
1866 | start = -2-idx; | |
1da177e4 | 1867 | break; |
df0ba92a | 1868 | } |
1da177e4 LT |
1869 | } |
1870 | return start; | |
1871 | } | |
1872 | ||
d5422efe HX |
1873 | int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, |
1874 | unsigned int family, int reverse) | |
1da177e4 LT |
1875 | { |
1876 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
e0d1caa7 | 1877 | int err; |
1da177e4 LT |
1878 | |
1879 | if (unlikely(afinfo == NULL)) | |
1880 | return -EAFNOSUPPORT; | |
1881 | ||
d5422efe | 1882 | afinfo->decode_session(skb, fl, reverse); |
beb8d13b | 1883 | err = security_xfrm_decode_session(skb, &fl->secid); |
1da177e4 | 1884 | xfrm_policy_put_afinfo(afinfo); |
e0d1caa7 | 1885 | return err; |
1da177e4 | 1886 | } |
d5422efe | 1887 | EXPORT_SYMBOL(__xfrm_decode_session); |
1da177e4 | 1888 | |
df0ba92a | 1889 | static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp) |
1da177e4 LT |
1890 | { |
1891 | for (; k < sp->len; k++) { | |
df0ba92a | 1892 | if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) { |
d1d9facf | 1893 | *idxp = k; |
1da177e4 | 1894 | return 1; |
df0ba92a | 1895 | } |
1da177e4 LT |
1896 | } |
1897 | ||
1898 | return 0; | |
1899 | } | |
1900 | ||
a716c119 | 1901 | int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, |
1da177e4 LT |
1902 | unsigned short family) |
1903 | { | |
1904 | struct xfrm_policy *pol; | |
4e81bb83 MN |
1905 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
1906 | int npols = 0; | |
1907 | int xfrm_nr; | |
1908 | int pi; | |
d5422efe | 1909 | int reverse; |
1da177e4 | 1910 | struct flowi fl; |
d5422efe | 1911 | u8 fl_dir; |
df0ba92a | 1912 | int xerr_idx = -1; |
1da177e4 | 1913 | |
d5422efe HX |
1914 | reverse = dir & ~XFRM_POLICY_MASK; |
1915 | dir &= XFRM_POLICY_MASK; | |
1916 | fl_dir = policy_to_flow_dir(dir); | |
1917 | ||
0aa64774 MN |
1918 | if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) { |
1919 | XFRM_INC_STATS(LINUX_MIB_XFRMINHDRERROR); | |
1da177e4 | 1920 | return 0; |
0aa64774 MN |
1921 | } |
1922 | ||
eb9c7ebe | 1923 | nf_nat_decode_session(skb, &fl, family); |
1da177e4 LT |
1924 | |
1925 | /* First, check used SA against their selectors. */ | |
1926 | if (skb->sp) { | |
1927 | int i; | |
1928 | ||
1929 | for (i=skb->sp->len-1; i>=0; i--) { | |
dbe5b4aa | 1930 | struct xfrm_state *x = skb->sp->xvec[i]; |
0aa64774 MN |
1931 | if (!xfrm_selector_match(&x->sel, &fl, family)) { |
1932 | XFRM_INC_STATS(LINUX_MIB_XFRMINSTATEMISMATCH); | |
1da177e4 | 1933 | return 0; |
0aa64774 | 1934 | } |
1da177e4 LT |
1935 | } |
1936 | } | |
1937 | ||
1938 | pol = NULL; | |
3bccfbc7 | 1939 | if (sk && sk->sk_policy[dir]) { |
e0d1caa7 | 1940 | pol = xfrm_sk_policy_lookup(sk, dir, &fl); |
0aa64774 MN |
1941 | if (IS_ERR(pol)) { |
1942 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR); | |
3bccfbc7 | 1943 | return 0; |
0aa64774 | 1944 | } |
3bccfbc7 | 1945 | } |
1da177e4 LT |
1946 | |
1947 | if (!pol) | |
e0d1caa7 | 1948 | pol = flow_cache_lookup(&fl, family, fl_dir, |
1da177e4 LT |
1949 | xfrm_policy_lookup); |
1950 | ||
0aa64774 MN |
1951 | if (IS_ERR(pol)) { |
1952 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR); | |
134b0fc5 | 1953 | return 0; |
0aa64774 | 1954 | } |
134b0fc5 | 1955 | |
df0ba92a | 1956 | if (!pol) { |
d1d9facf | 1957 | if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) { |
df0ba92a | 1958 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
0aa64774 | 1959 | XFRM_INC_STATS(LINUX_MIB_XFRMINNOPOLS); |
df0ba92a MN |
1960 | return 0; |
1961 | } | |
1962 | return 1; | |
1963 | } | |
1da177e4 | 1964 | |
9d729f72 | 1965 | pol->curlft.use_time = get_seconds(); |
1da177e4 | 1966 | |
4e81bb83 MN |
1967 | pols[0] = pol; |
1968 | npols ++; | |
1969 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1970 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1971 | pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, | |
1972 | &fl, family, | |
1973 | XFRM_POLICY_IN); | |
1974 | if (pols[1]) { | |
0aa64774 MN |
1975 | if (IS_ERR(pols[1])) { |
1976 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR); | |
134b0fc5 | 1977 | return 0; |
0aa64774 | 1978 | } |
9d729f72 | 1979 | pols[1]->curlft.use_time = get_seconds(); |
4e81bb83 MN |
1980 | npols ++; |
1981 | } | |
1982 | } | |
1983 | #endif | |
1984 | ||
1da177e4 LT |
1985 | if (pol->action == XFRM_POLICY_ALLOW) { |
1986 | struct sec_path *sp; | |
1987 | static struct sec_path dummy; | |
4e81bb83 | 1988 | struct xfrm_tmpl *tp[XFRM_MAX_DEPTH]; |
41a49cc3 | 1989 | struct xfrm_tmpl *stp[XFRM_MAX_DEPTH]; |
4e81bb83 MN |
1990 | struct xfrm_tmpl **tpp = tp; |
1991 | int ti = 0; | |
1da177e4 LT |
1992 | int i, k; |
1993 | ||
1994 | if ((sp = skb->sp) == NULL) | |
1995 | sp = &dummy; | |
1996 | ||
4e81bb83 MN |
1997 | for (pi = 0; pi < npols; pi++) { |
1998 | if (pols[pi] != pol && | |
0aa64774 MN |
1999 | pols[pi]->action != XFRM_POLICY_ALLOW) { |
2000 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLBLOCK); | |
4e81bb83 | 2001 | goto reject; |
0aa64774 MN |
2002 | } |
2003 | if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
2004 | XFRM_INC_STATS(LINUX_MIB_XFRMINBUFFERERROR); | |
4e81bb83 | 2005 | goto reject_error; |
0aa64774 | 2006 | } |
4e81bb83 MN |
2007 | for (i = 0; i < pols[pi]->xfrm_nr; i++) |
2008 | tpp[ti++] = &pols[pi]->xfrm_vec[i]; | |
2009 | } | |
2010 | xfrm_nr = ti; | |
41a49cc3 MN |
2011 | if (npols > 1) { |
2012 | xfrm_tmpl_sort(stp, tpp, xfrm_nr, family); | |
2013 | tpp = stp; | |
2014 | } | |
4e81bb83 | 2015 | |
1da177e4 LT |
2016 | /* For each tunnel xfrm, find the first matching tmpl. |
2017 | * For each tmpl before that, find corresponding xfrm. | |
2018 | * Order is _important_. Later we will implement | |
2019 | * some barriers, but at the moment barriers | |
2020 | * are implied between each two transformations. | |
2021 | */ | |
4e81bb83 MN |
2022 | for (i = xfrm_nr-1, k = 0; i >= 0; i--) { |
2023 | k = xfrm_policy_ok(tpp[i], sp, k, family); | |
df0ba92a | 2024 | if (k < 0) { |
d1d9facf JM |
2025 | if (k < -1) |
2026 | /* "-2 - errored_index" returned */ | |
2027 | xerr_idx = -(2+k); | |
0aa64774 | 2028 | XFRM_INC_STATS(LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 2029 | goto reject; |
df0ba92a | 2030 | } |
1da177e4 LT |
2031 | } |
2032 | ||
0aa64774 MN |
2033 | if (secpath_has_nontransport(sp, k, &xerr_idx)) { |
2034 | XFRM_INC_STATS(LINUX_MIB_XFRMINTMPLMISMATCH); | |
1da177e4 | 2035 | goto reject; |
0aa64774 | 2036 | } |
1da177e4 | 2037 | |
4e81bb83 | 2038 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
2039 | return 1; |
2040 | } | |
0aa64774 | 2041 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLBLOCK); |
1da177e4 LT |
2042 | |
2043 | reject: | |
df0ba92a | 2044 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
4e81bb83 MN |
2045 | reject_error: |
2046 | xfrm_pols_put(pols, npols); | |
1da177e4 LT |
2047 | return 0; |
2048 | } | |
2049 | EXPORT_SYMBOL(__xfrm_policy_check); | |
2050 | ||
2051 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
2052 | { | |
2053 | struct flowi fl; | |
2054 | ||
0aa64774 MN |
2055 | if (xfrm_decode_session(skb, &fl, family) < 0) { |
2056 | /* XXX: we should have something like FWDHDRERROR here. */ | |
2057 | XFRM_INC_STATS(LINUX_MIB_XFRMINHDRERROR); | |
1da177e4 | 2058 | return 0; |
0aa64774 | 2059 | } |
1da177e4 LT |
2060 | |
2061 | return xfrm_lookup(&skb->dst, &fl, NULL, 0) == 0; | |
2062 | } | |
2063 | EXPORT_SYMBOL(__xfrm_route_forward); | |
2064 | ||
d49c73c7 DM |
2065 | /* Optimize later using cookies and generation ids. */ |
2066 | ||
1da177e4 LT |
2067 | static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) |
2068 | { | |
d49c73c7 DM |
2069 | /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete |
2070 | * to "-1" to force all XFRM destinations to get validated by | |
2071 | * dst_ops->check on every use. We do this because when a | |
2072 | * normal route referenced by an XFRM dst is obsoleted we do | |
2073 | * not go looking around for all parent referencing XFRM dsts | |
2074 | * so that we can invalidate them. It is just too much work. | |
2075 | * Instead we make the checks here on every use. For example: | |
2076 | * | |
2077 | * XFRM dst A --> IPv4 dst X | |
2078 | * | |
2079 | * X is the "xdst->route" of A (X is also the "dst->path" of A | |
2080 | * in this example). If X is marked obsolete, "A" will not | |
2081 | * notice. That's what we are validating here via the | |
2082 | * stale_bundle() check. | |
2083 | * | |
2084 | * When a policy's bundle is pruned, we dst_free() the XFRM | |
2085 | * dst which causes it's ->obsolete field to be set to a | |
2086 | * positive non-zero integer. If an XFRM dst has been pruned | |
2087 | * like this, we want to force a new route lookup. | |
399c180a | 2088 | */ |
d49c73c7 DM |
2089 | if (dst->obsolete < 0 && !stale_bundle(dst)) |
2090 | return dst; | |
2091 | ||
1da177e4 LT |
2092 | return NULL; |
2093 | } | |
2094 | ||
2095 | static int stale_bundle(struct dst_entry *dst) | |
2096 | { | |
5b368e61 | 2097 | return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0); |
1da177e4 LT |
2098 | } |
2099 | ||
aabc9761 | 2100 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
1da177e4 | 2101 | { |
1da177e4 | 2102 | while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { |
c346dca1 | 2103 | dst->dev = dev_net(dev)->loopback_dev; |
de3cb747 | 2104 | dev_hold(dst->dev); |
1da177e4 LT |
2105 | dev_put(dev); |
2106 | } | |
2107 | } | |
aabc9761 | 2108 | EXPORT_SYMBOL(xfrm_dst_ifdown); |
1da177e4 LT |
2109 | |
2110 | static void xfrm_link_failure(struct sk_buff *skb) | |
2111 | { | |
2112 | /* Impossible. Such dst must be popped before reaches point of failure. */ | |
2113 | return; | |
2114 | } | |
2115 | ||
2116 | static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) | |
2117 | { | |
2118 | if (dst) { | |
2119 | if (dst->obsolete) { | |
2120 | dst_release(dst); | |
2121 | dst = NULL; | |
2122 | } | |
2123 | } | |
2124 | return dst; | |
2125 | } | |
2126 | ||
2518c7c2 DM |
2127 | static void prune_one_bundle(struct xfrm_policy *pol, int (*func)(struct dst_entry *), struct dst_entry **gc_list_p) |
2128 | { | |
2129 | struct dst_entry *dst, **dstp; | |
2130 | ||
2131 | write_lock(&pol->lock); | |
2132 | dstp = &pol->bundles; | |
2133 | while ((dst=*dstp) != NULL) { | |
2134 | if (func(dst)) { | |
2135 | *dstp = dst->next; | |
2136 | dst->next = *gc_list_p; | |
2137 | *gc_list_p = dst; | |
2138 | } else { | |
2139 | dstp = &dst->next; | |
2140 | } | |
2141 | } | |
2142 | write_unlock(&pol->lock); | |
2143 | } | |
2144 | ||
1da177e4 LT |
2145 | static void xfrm_prune_bundles(int (*func)(struct dst_entry *)) |
2146 | { | |
2518c7c2 DM |
2147 | struct dst_entry *gc_list = NULL; |
2148 | int dir; | |
1da177e4 LT |
2149 | |
2150 | read_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
2151 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
2152 | struct xfrm_policy *pol; | |
2153 | struct hlist_node *entry; | |
2154 | struct hlist_head *table; | |
2155 | int i; | |
4e81bb83 | 2156 | |
2518c7c2 DM |
2157 | hlist_for_each_entry(pol, entry, |
2158 | &xfrm_policy_inexact[dir], bydst) | |
2159 | prune_one_bundle(pol, func, &gc_list); | |
2160 | ||
2161 | table = xfrm_policy_bydst[dir].table; | |
2162 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { | |
2163 | hlist_for_each_entry(pol, entry, table + i, bydst) | |
2164 | prune_one_bundle(pol, func, &gc_list); | |
1da177e4 LT |
2165 | } |
2166 | } | |
2167 | read_unlock_bh(&xfrm_policy_lock); | |
2168 | ||
2169 | while (gc_list) { | |
2518c7c2 | 2170 | struct dst_entry *dst = gc_list; |
1da177e4 LT |
2171 | gc_list = dst->next; |
2172 | dst_free(dst); | |
2173 | } | |
2174 | } | |
2175 | ||
2176 | static int unused_bundle(struct dst_entry *dst) | |
2177 | { | |
2178 | return !atomic_read(&dst->__refcnt); | |
2179 | } | |
2180 | ||
2181 | static void __xfrm_garbage_collect(void) | |
2182 | { | |
2183 | xfrm_prune_bundles(unused_bundle); | |
2184 | } | |
2185 | ||
1c095399 | 2186 | static int xfrm_flush_bundles(void) |
1da177e4 LT |
2187 | { |
2188 | xfrm_prune_bundles(stale_bundle); | |
2189 | return 0; | |
2190 | } | |
2191 | ||
25ee3286 | 2192 | static void xfrm_init_pmtu(struct dst_entry *dst) |
1da177e4 LT |
2193 | { |
2194 | do { | |
2195 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2196 | u32 pmtu, route_mtu_cached; | |
2197 | ||
2198 | pmtu = dst_mtu(dst->child); | |
2199 | xdst->child_mtu_cached = pmtu; | |
2200 | ||
2201 | pmtu = xfrm_state_mtu(dst->xfrm, pmtu); | |
2202 | ||
2203 | route_mtu_cached = dst_mtu(xdst->route); | |
2204 | xdst->route_mtu_cached = route_mtu_cached; | |
2205 | ||
2206 | if (pmtu > route_mtu_cached) | |
2207 | pmtu = route_mtu_cached; | |
2208 | ||
2209 | dst->metrics[RTAX_MTU-1] = pmtu; | |
2210 | } while ((dst = dst->next)); | |
2211 | } | |
2212 | ||
1da177e4 LT |
2213 | /* Check that the bundle accepts the flow and its components are |
2214 | * still valid. | |
2215 | */ | |
2216 | ||
5b368e61 VY |
2217 | int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first, |
2218 | struct flowi *fl, int family, int strict) | |
1da177e4 LT |
2219 | { |
2220 | struct dst_entry *dst = &first->u.dst; | |
2221 | struct xfrm_dst *last; | |
2222 | u32 mtu; | |
2223 | ||
92d63dec | 2224 | if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || |
1da177e4 LT |
2225 | (dst->dev && !netif_running(dst->dev))) |
2226 | return 0; | |
157bfc25 MN |
2227 | #ifdef CONFIG_XFRM_SUB_POLICY |
2228 | if (fl) { | |
2229 | if (first->origin && !flow_cache_uli_match(first->origin, fl)) | |
2230 | return 0; | |
2231 | if (first->partner && | |
2232 | !xfrm_selector_match(first->partner, fl, family)) | |
2233 | return 0; | |
2234 | } | |
2235 | #endif | |
1da177e4 LT |
2236 | |
2237 | last = NULL; | |
2238 | ||
2239 | do { | |
2240 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2241 | ||
2242 | if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family)) | |
2243 | return 0; | |
67f83cbf VY |
2244 | if (fl && pol && |
2245 | !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl)) | |
e0d1caa7 | 2246 | return 0; |
1da177e4 LT |
2247 | if (dst->xfrm->km.state != XFRM_STATE_VALID) |
2248 | return 0; | |
9d4a706d DM |
2249 | if (xdst->genid != dst->xfrm->genid) |
2250 | return 0; | |
e53820de | 2251 | |
1bfcb10f | 2252 | if (strict && fl && |
13996378 | 2253 | !(dst->xfrm->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) && |
e53820de MN |
2254 | !xfrm_state_addr_flow_check(dst->xfrm, fl, family)) |
2255 | return 0; | |
1da177e4 LT |
2256 | |
2257 | mtu = dst_mtu(dst->child); | |
2258 | if (xdst->child_mtu_cached != mtu) { | |
2259 | last = xdst; | |
2260 | xdst->child_mtu_cached = mtu; | |
2261 | } | |
2262 | ||
92d63dec | 2263 | if (!dst_check(xdst->route, xdst->route_cookie)) |
1da177e4 LT |
2264 | return 0; |
2265 | mtu = dst_mtu(xdst->route); | |
2266 | if (xdst->route_mtu_cached != mtu) { | |
2267 | last = xdst; | |
2268 | xdst->route_mtu_cached = mtu; | |
2269 | } | |
2270 | ||
2271 | dst = dst->child; | |
2272 | } while (dst->xfrm); | |
2273 | ||
2274 | if (likely(!last)) | |
2275 | return 1; | |
2276 | ||
2277 | mtu = last->child_mtu_cached; | |
2278 | for (;;) { | |
2279 | dst = &last->u.dst; | |
2280 | ||
2281 | mtu = xfrm_state_mtu(dst->xfrm, mtu); | |
2282 | if (mtu > last->route_mtu_cached) | |
2283 | mtu = last->route_mtu_cached; | |
2284 | dst->metrics[RTAX_MTU-1] = mtu; | |
2285 | ||
2286 | if (last == first) | |
2287 | break; | |
2288 | ||
bd0bf076 | 2289 | last = (struct xfrm_dst *)last->u.dst.next; |
1da177e4 LT |
2290 | last->child_mtu_cached = mtu; |
2291 | } | |
2292 | ||
2293 | return 1; | |
2294 | } | |
2295 | ||
2296 | EXPORT_SYMBOL(xfrm_bundle_ok); | |
2297 | ||
1da177e4 LT |
2298 | int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) |
2299 | { | |
2300 | int err = 0; | |
2301 | if (unlikely(afinfo == NULL)) | |
2302 | return -EINVAL; | |
2303 | if (unlikely(afinfo->family >= NPROTO)) | |
2304 | return -EAFNOSUPPORT; | |
e959d812 | 2305 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2306 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) |
2307 | err = -ENOBUFS; | |
2308 | else { | |
2309 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2310 | if (likely(dst_ops->kmem_cachep == NULL)) | |
2311 | dst_ops->kmem_cachep = xfrm_dst_cache; | |
2312 | if (likely(dst_ops->check == NULL)) | |
2313 | dst_ops->check = xfrm_dst_check; | |
1da177e4 LT |
2314 | if (likely(dst_ops->negative_advice == NULL)) |
2315 | dst_ops->negative_advice = xfrm_negative_advice; | |
2316 | if (likely(dst_ops->link_failure == NULL)) | |
2317 | dst_ops->link_failure = xfrm_link_failure; | |
1da177e4 LT |
2318 | if (likely(afinfo->garbage_collect == NULL)) |
2319 | afinfo->garbage_collect = __xfrm_garbage_collect; | |
2320 | xfrm_policy_afinfo[afinfo->family] = afinfo; | |
2321 | } | |
e959d812 | 2322 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2323 | return err; |
2324 | } | |
2325 | EXPORT_SYMBOL(xfrm_policy_register_afinfo); | |
2326 | ||
2327 | int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2328 | { | |
2329 | int err = 0; | |
2330 | if (unlikely(afinfo == NULL)) | |
2331 | return -EINVAL; | |
2332 | if (unlikely(afinfo->family >= NPROTO)) | |
2333 | return -EAFNOSUPPORT; | |
e959d812 | 2334 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2335 | if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { |
2336 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) | |
2337 | err = -EINVAL; | |
2338 | else { | |
2339 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2340 | xfrm_policy_afinfo[afinfo->family] = NULL; | |
2341 | dst_ops->kmem_cachep = NULL; | |
2342 | dst_ops->check = NULL; | |
1da177e4 LT |
2343 | dst_ops->negative_advice = NULL; |
2344 | dst_ops->link_failure = NULL; | |
1da177e4 LT |
2345 | afinfo->garbage_collect = NULL; |
2346 | } | |
2347 | } | |
e959d812 | 2348 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2349 | return err; |
2350 | } | |
2351 | EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); | |
2352 | ||
2353 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) | |
2354 | { | |
2355 | struct xfrm_policy_afinfo *afinfo; | |
2356 | if (unlikely(family >= NPROTO)) | |
2357 | return NULL; | |
2358 | read_lock(&xfrm_policy_afinfo_lock); | |
2359 | afinfo = xfrm_policy_afinfo[family]; | |
546be240 HX |
2360 | if (unlikely(!afinfo)) |
2361 | read_unlock(&xfrm_policy_afinfo_lock); | |
1da177e4 LT |
2362 | return afinfo; |
2363 | } | |
2364 | ||
2365 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2366 | { | |
546be240 HX |
2367 | read_unlock(&xfrm_policy_afinfo_lock); |
2368 | } | |
2369 | ||
1da177e4 LT |
2370 | static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) |
2371 | { | |
e9dc8653 EB |
2372 | struct net_device *dev = ptr; |
2373 | ||
721499e8 | 2374 | if (!net_eq(dev_net(dev), &init_net)) |
e9dc8653 EB |
2375 | return NOTIFY_DONE; |
2376 | ||
1da177e4 LT |
2377 | switch (event) { |
2378 | case NETDEV_DOWN: | |
2379 | xfrm_flush_bundles(); | |
2380 | } | |
2381 | return NOTIFY_DONE; | |
2382 | } | |
2383 | ||
2384 | static struct notifier_block xfrm_dev_notifier = { | |
d5917a35 | 2385 | .notifier_call = xfrm_dev_event, |
1da177e4 LT |
2386 | }; |
2387 | ||
558f82ef MN |
2388 | #ifdef CONFIG_XFRM_STATISTICS |
2389 | static int __init xfrm_statistics_init(void) | |
2390 | { | |
2391 | if (snmp_mib_init((void **)xfrm_statistics, | |
2392 | sizeof(struct linux_xfrm_mib)) < 0) | |
2393 | return -ENOMEM; | |
2394 | return 0; | |
2395 | } | |
2396 | #endif | |
2397 | ||
d62ddc21 | 2398 | static int __net_init xfrm_policy_init(struct net *net) |
1da177e4 | 2399 | { |
2518c7c2 DM |
2400 | unsigned int hmask, sz; |
2401 | int dir; | |
2402 | ||
d62ddc21 AD |
2403 | if (net_eq(net, &init_net)) |
2404 | xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", | |
1da177e4 | 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); |
d62ddc21 AD |
2430 | if (net_eq(net, &init_net)) |
2431 | register_netdevice_notifier(&xfrm_dev_notifier); | |
2432 | return 0; | |
2433 | } | |
2434 | ||
2435 | static void xfrm_policy_fini(struct net *net) | |
2436 | { | |
1da177e4 LT |
2437 | } |
2438 | ||
d62ddc21 AD |
2439 | static int __net_init xfrm_net_init(struct net *net) |
2440 | { | |
2441 | int rv; | |
2442 | ||
2443 | rv = xfrm_state_init(net); | |
2444 | if (rv < 0) | |
2445 | goto out_state; | |
2446 | rv = xfrm_policy_init(net); | |
2447 | if (rv < 0) | |
2448 | goto out_policy; | |
2449 | return 0; | |
2450 | ||
2451 | out_policy: | |
2452 | xfrm_state_fini(net); | |
2453 | out_state: | |
2454 | return rv; | |
2455 | } | |
2456 | ||
2457 | static void __net_exit xfrm_net_exit(struct net *net) | |
2458 | { | |
2459 | xfrm_policy_fini(net); | |
2460 | xfrm_state_fini(net); | |
2461 | } | |
2462 | ||
2463 | static struct pernet_operations __net_initdata xfrm_net_ops = { | |
2464 | .init = xfrm_net_init, | |
2465 | .exit = xfrm_net_exit, | |
2466 | }; | |
2467 | ||
1da177e4 LT |
2468 | void __init xfrm_init(void) |
2469 | { | |
d62ddc21 | 2470 | register_pernet_subsys(&xfrm_net_ops); |
558f82ef MN |
2471 | #ifdef CONFIG_XFRM_STATISTICS |
2472 | xfrm_statistics_init(); | |
2473 | #endif | |
1da177e4 | 2474 | xfrm_input_init(); |
558f82ef MN |
2475 | #ifdef CONFIG_XFRM_STATISTICS |
2476 | xfrm_proc_init(); | |
2477 | #endif | |
1da177e4 LT |
2478 | } |
2479 | ||
ab5f5e8b | 2480 | #ifdef CONFIG_AUDITSYSCALL |
1486cbd7 IJ |
2481 | static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp, |
2482 | struct audit_buffer *audit_buf) | |
ab5f5e8b | 2483 | { |
875179fa PM |
2484 | struct xfrm_sec_ctx *ctx = xp->security; |
2485 | struct xfrm_selector *sel = &xp->selector; | |
2486 | ||
2487 | if (ctx) | |
ab5f5e8b | 2488 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", |
875179fa | 2489 | ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); |
ab5f5e8b | 2490 | |
875179fa | 2491 | switch(sel->family) { |
ab5f5e8b | 2492 | case AF_INET: |
21454aaa | 2493 | audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4); |
875179fa PM |
2494 | if (sel->prefixlen_s != 32) |
2495 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2496 | sel->prefixlen_s); | |
21454aaa | 2497 | audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4); |
875179fa PM |
2498 | if (sel->prefixlen_d != 32) |
2499 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2500 | sel->prefixlen_d); | |
ab5f5e8b JL |
2501 | break; |
2502 | case AF_INET6: | |
5b095d98 | 2503 | audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6); |
875179fa PM |
2504 | if (sel->prefixlen_s != 128) |
2505 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2506 | sel->prefixlen_s); | |
5b095d98 | 2507 | audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6); |
875179fa PM |
2508 | if (sel->prefixlen_d != 128) |
2509 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2510 | sel->prefixlen_d); | |
ab5f5e8b JL |
2511 | break; |
2512 | } | |
2513 | } | |
2514 | ||
68277acc | 2515 | void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, |
2532386f | 2516 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2517 | { |
2518 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2519 | |
afeb14b4 | 2520 | audit_buf = xfrm_audit_start("SPD-add"); |
ab5f5e8b JL |
2521 | if (audit_buf == NULL) |
2522 | return; | |
2532386f | 2523 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 | 2524 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
2525 | xfrm_audit_common_policyinfo(xp, audit_buf); |
2526 | audit_log_end(audit_buf); | |
2527 | } | |
2528 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_add); | |
2529 | ||
68277acc | 2530 | void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, |
2532386f | 2531 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2532 | { |
2533 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2534 | |
afeb14b4 | 2535 | audit_buf = xfrm_audit_start("SPD-delete"); |
ab5f5e8b JL |
2536 | if (audit_buf == NULL) |
2537 | return; | |
2532386f | 2538 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 | 2539 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
2540 | xfrm_audit_common_policyinfo(xp, audit_buf); |
2541 | audit_log_end(audit_buf); | |
2542 | } | |
2543 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete); | |
2544 | #endif | |
2545 | ||
80c9abaa SS |
2546 | #ifdef CONFIG_XFRM_MIGRATE |
2547 | static int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp, | |
2548 | struct xfrm_selector *sel_tgt) | |
2549 | { | |
2550 | if (sel_cmp->proto == IPSEC_ULPROTO_ANY) { | |
2551 | if (sel_tgt->family == sel_cmp->family && | |
2552 | xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr, | |
a716c119 | 2553 | sel_cmp->family) == 0 && |
80c9abaa SS |
2554 | xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr, |
2555 | sel_cmp->family) == 0 && | |
2556 | sel_tgt->prefixlen_d == sel_cmp->prefixlen_d && | |
2557 | sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) { | |
2558 | return 1; | |
2559 | } | |
2560 | } else { | |
2561 | if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) { | |
2562 | return 1; | |
2563 | } | |
2564 | } | |
2565 | return 0; | |
2566 | } | |
2567 | ||
2568 | static struct xfrm_policy * xfrm_migrate_policy_find(struct xfrm_selector *sel, | |
2569 | u8 dir, u8 type) | |
2570 | { | |
2571 | struct xfrm_policy *pol, *ret = NULL; | |
2572 | struct hlist_node *entry; | |
2573 | struct hlist_head *chain; | |
2574 | u32 priority = ~0U; | |
2575 | ||
2576 | read_lock_bh(&xfrm_policy_lock); | |
2577 | chain = policy_hash_direct(&sel->daddr, &sel->saddr, sel->family, dir); | |
2578 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
2579 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2580 | pol->type == type) { | |
2581 | ret = pol; | |
2582 | priority = ret->priority; | |
2583 | break; | |
2584 | } | |
2585 | } | |
2586 | chain = &xfrm_policy_inexact[dir]; | |
2587 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
2588 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2589 | pol->type == type && | |
2590 | pol->priority < priority) { | |
2591 | ret = pol; | |
2592 | break; | |
2593 | } | |
2594 | } | |
2595 | ||
2596 | if (ret) | |
2597 | xfrm_pol_hold(ret); | |
2598 | ||
2599 | read_unlock_bh(&xfrm_policy_lock); | |
2600 | ||
2601 | return ret; | |
2602 | } | |
2603 | ||
2604 | static int migrate_tmpl_match(struct xfrm_migrate *m, struct xfrm_tmpl *t) | |
2605 | { | |
2606 | int match = 0; | |
2607 | ||
2608 | if (t->mode == m->mode && t->id.proto == m->proto && | |
2609 | (m->reqid == 0 || t->reqid == m->reqid)) { | |
2610 | switch (t->mode) { | |
2611 | case XFRM_MODE_TUNNEL: | |
2612 | case XFRM_MODE_BEET: | |
2613 | if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr, | |
2614 | m->old_family) == 0 && | |
2615 | xfrm_addr_cmp(&t->saddr, &m->old_saddr, | |
2616 | m->old_family) == 0) { | |
2617 | match = 1; | |
2618 | } | |
2619 | break; | |
2620 | case XFRM_MODE_TRANSPORT: | |
2621 | /* in case of transport mode, template does not store | |
2622 | any IP addresses, hence we just compare mode and | |
2623 | protocol */ | |
2624 | match = 1; | |
2625 | break; | |
2626 | default: | |
2627 | break; | |
2628 | } | |
2629 | } | |
2630 | return match; | |
2631 | } | |
2632 | ||
2633 | /* update endpoint address(es) of template(s) */ | |
2634 | static int xfrm_policy_migrate(struct xfrm_policy *pol, | |
2635 | struct xfrm_migrate *m, int num_migrate) | |
2636 | { | |
2637 | struct xfrm_migrate *mp; | |
2638 | struct dst_entry *dst; | |
2639 | int i, j, n = 0; | |
2640 | ||
2641 | write_lock_bh(&pol->lock); | |
12a169e7 | 2642 | if (unlikely(pol->walk.dead)) { |
80c9abaa SS |
2643 | /* target policy has been deleted */ |
2644 | write_unlock_bh(&pol->lock); | |
2645 | return -ENOENT; | |
2646 | } | |
2647 | ||
2648 | for (i = 0; i < pol->xfrm_nr; i++) { | |
2649 | for (j = 0, mp = m; j < num_migrate; j++, mp++) { | |
2650 | if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i])) | |
2651 | continue; | |
2652 | n++; | |
1bfcb10f HX |
2653 | if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL && |
2654 | pol->xfrm_vec[i].mode != XFRM_MODE_BEET) | |
80c9abaa SS |
2655 | continue; |
2656 | /* update endpoints */ | |
2657 | memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr, | |
2658 | sizeof(pol->xfrm_vec[i].id.daddr)); | |
2659 | memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr, | |
2660 | sizeof(pol->xfrm_vec[i].saddr)); | |
2661 | pol->xfrm_vec[i].encap_family = mp->new_family; | |
2662 | /* flush bundles */ | |
2663 | while ((dst = pol->bundles) != NULL) { | |
2664 | pol->bundles = dst->next; | |
2665 | dst_free(dst); | |
2666 | } | |
2667 | } | |
2668 | } | |
2669 | ||
2670 | write_unlock_bh(&pol->lock); | |
2671 | ||
2672 | if (!n) | |
2673 | return -ENODATA; | |
2674 | ||
2675 | return 0; | |
2676 | } | |
2677 | ||
2678 | static int xfrm_migrate_check(struct xfrm_migrate *m, int num_migrate) | |
2679 | { | |
2680 | int i, j; | |
2681 | ||
2682 | if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) | |
2683 | return -EINVAL; | |
2684 | ||
2685 | for (i = 0; i < num_migrate; i++) { | |
2686 | if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr, | |
2687 | m[i].old_family) == 0) && | |
2688 | (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr, | |
2689 | m[i].old_family) == 0)) | |
2690 | return -EINVAL; | |
2691 | if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) || | |
2692 | xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) | |
2693 | return -EINVAL; | |
2694 | ||
2695 | /* check if there is any duplicated entry */ | |
2696 | for (j = i + 1; j < num_migrate; j++) { | |
2697 | if (!memcmp(&m[i].old_daddr, &m[j].old_daddr, | |
2698 | sizeof(m[i].old_daddr)) && | |
2699 | !memcmp(&m[i].old_saddr, &m[j].old_saddr, | |
2700 | sizeof(m[i].old_saddr)) && | |
2701 | m[i].proto == m[j].proto && | |
2702 | m[i].mode == m[j].mode && | |
2703 | m[i].reqid == m[j].reqid && | |
2704 | m[i].old_family == m[j].old_family) | |
2705 | return -EINVAL; | |
2706 | } | |
2707 | } | |
2708 | ||
2709 | return 0; | |
2710 | } | |
2711 | ||
2712 | int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type, | |
13c1d189 AE |
2713 | struct xfrm_migrate *m, int num_migrate, |
2714 | struct xfrm_kmaddress *k) | |
80c9abaa SS |
2715 | { |
2716 | int i, err, nx_cur = 0, nx_new = 0; | |
2717 | struct xfrm_policy *pol = NULL; | |
2718 | struct xfrm_state *x, *xc; | |
2719 | struct xfrm_state *x_cur[XFRM_MAX_DEPTH]; | |
2720 | struct xfrm_state *x_new[XFRM_MAX_DEPTH]; | |
2721 | struct xfrm_migrate *mp; | |
2722 | ||
2723 | if ((err = xfrm_migrate_check(m, num_migrate)) < 0) | |
2724 | goto out; | |
2725 | ||
2726 | /* Stage 1 - find policy */ | |
2727 | if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) { | |
2728 | err = -ENOENT; | |
2729 | goto out; | |
2730 | } | |
2731 | ||
2732 | /* Stage 2 - find and update state(s) */ | |
2733 | for (i = 0, mp = m; i < num_migrate; i++, mp++) { | |
2734 | if ((x = xfrm_migrate_state_find(mp))) { | |
2735 | x_cur[nx_cur] = x; | |
2736 | nx_cur++; | |
2737 | if ((xc = xfrm_state_migrate(x, mp))) { | |
2738 | x_new[nx_new] = xc; | |
2739 | nx_new++; | |
2740 | } else { | |
2741 | err = -ENODATA; | |
2742 | goto restore_state; | |
2743 | } | |
2744 | } | |
2745 | } | |
2746 | ||
2747 | /* Stage 3 - update policy */ | |
2748 | if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0) | |
2749 | goto restore_state; | |
2750 | ||
2751 | /* Stage 4 - delete old state(s) */ | |
2752 | if (nx_cur) { | |
2753 | xfrm_states_put(x_cur, nx_cur); | |
2754 | xfrm_states_delete(x_cur, nx_cur); | |
2755 | } | |
2756 | ||
2757 | /* Stage 5 - announce */ | |
13c1d189 | 2758 | km_migrate(sel, dir, type, m, num_migrate, k); |
80c9abaa SS |
2759 | |
2760 | xfrm_pol_put(pol); | |
2761 | ||
2762 | return 0; | |
2763 | out: | |
2764 | return err; | |
2765 | ||
2766 | restore_state: | |
2767 | if (pol) | |
2768 | xfrm_pol_put(pol); | |
2769 | if (nx_cur) | |
2770 | xfrm_states_put(x_cur, nx_cur); | |
2771 | if (nx_new) | |
2772 | xfrm_states_delete(x_new, nx_new); | |
2773 | ||
2774 | return err; | |
2775 | } | |
e610e679 | 2776 | EXPORT_SYMBOL(xfrm_migrate); |
80c9abaa | 2777 | #endif |