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 | ||
aad0e0b9 | 37 | int sysctl_xfrm_larval_drop __read_mostly; |
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 | ||
2518c7c2 DM |
49 | unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2]; |
50 | EXPORT_SYMBOL(xfrm_policy_count); | |
1da177e4 LT |
51 | |
52 | static DEFINE_RWLOCK(xfrm_policy_afinfo_lock); | |
53 | static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO]; | |
54 | ||
e18b890b | 55 | static struct kmem_cache *xfrm_dst_cache __read_mostly; |
1da177e4 LT |
56 | |
57 | static struct work_struct xfrm_policy_gc_work; | |
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 | ||
25ee3286 HX |
99 | static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos, |
100 | int family) | |
1da177e4 | 101 | { |
66cdb3ca HX |
102 | xfrm_address_t *saddr = &x->props.saddr; |
103 | xfrm_address_t *daddr = &x->id.daddr; | |
104 | struct xfrm_policy_afinfo *afinfo; | |
105 | struct dst_entry *dst; | |
106 | ||
107 | if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) | |
108 | saddr = x->coaddr; | |
109 | if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) | |
110 | daddr = x->coaddr; | |
1da177e4 | 111 | |
25ee3286 | 112 | afinfo = xfrm_policy_get_afinfo(family); |
1da177e4 | 113 | if (unlikely(afinfo == NULL)) |
66cdb3ca | 114 | return ERR_PTR(-EAFNOSUPPORT); |
1da177e4 | 115 | |
66cdb3ca | 116 | dst = afinfo->dst_lookup(tos, saddr, daddr); |
1da177e4 | 117 | xfrm_policy_put_afinfo(afinfo); |
66cdb3ca | 118 | return dst; |
1da177e4 | 119 | } |
1da177e4 | 120 | |
1da177e4 LT |
121 | static inline unsigned long make_jiffies(long secs) |
122 | { | |
123 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
124 | return MAX_SCHEDULE_TIMEOUT-1; | |
125 | else | |
a716c119 | 126 | return secs*HZ; |
1da177e4 LT |
127 | } |
128 | ||
129 | static void xfrm_policy_timer(unsigned long data) | |
130 | { | |
131 | struct xfrm_policy *xp = (struct xfrm_policy*)data; | |
9d729f72 | 132 | unsigned long now = get_seconds(); |
1da177e4 LT |
133 | long next = LONG_MAX; |
134 | int warn = 0; | |
135 | int dir; | |
136 | ||
137 | read_lock(&xp->lock); | |
138 | ||
139 | if (xp->dead) | |
140 | goto out; | |
141 | ||
77d8d7a6 | 142 | dir = xfrm_policy_id2dir(xp->index); |
1da177e4 LT |
143 | |
144 | if (xp->lft.hard_add_expires_seconds) { | |
145 | long tmo = xp->lft.hard_add_expires_seconds + | |
146 | xp->curlft.add_time - now; | |
147 | if (tmo <= 0) | |
148 | goto expired; | |
149 | if (tmo < next) | |
150 | next = tmo; | |
151 | } | |
152 | if (xp->lft.hard_use_expires_seconds) { | |
153 | long tmo = xp->lft.hard_use_expires_seconds + | |
154 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
155 | if (tmo <= 0) | |
156 | goto expired; | |
157 | if (tmo < next) | |
158 | next = tmo; | |
159 | } | |
160 | if (xp->lft.soft_add_expires_seconds) { | |
161 | long tmo = xp->lft.soft_add_expires_seconds + | |
162 | xp->curlft.add_time - now; | |
163 | if (tmo <= 0) { | |
164 | warn = 1; | |
165 | tmo = XFRM_KM_TIMEOUT; | |
166 | } | |
167 | if (tmo < next) | |
168 | next = tmo; | |
169 | } | |
170 | if (xp->lft.soft_use_expires_seconds) { | |
171 | long tmo = xp->lft.soft_use_expires_seconds + | |
172 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
173 | if (tmo <= 0) { | |
174 | warn = 1; | |
175 | tmo = XFRM_KM_TIMEOUT; | |
176 | } | |
177 | if (tmo < next) | |
178 | next = tmo; | |
179 | } | |
180 | ||
181 | if (warn) | |
6c5c8ca7 | 182 | km_policy_expired(xp, dir, 0, 0); |
1da177e4 LT |
183 | if (next != LONG_MAX && |
184 | !mod_timer(&xp->timer, jiffies + make_jiffies(next))) | |
185 | xfrm_pol_hold(xp); | |
186 | ||
187 | out: | |
188 | read_unlock(&xp->lock); | |
189 | xfrm_pol_put(xp); | |
190 | return; | |
191 | ||
192 | expired: | |
193 | read_unlock(&xp->lock); | |
4666faab | 194 | if (!xfrm_policy_delete(xp, dir)) |
6c5c8ca7 | 195 | km_policy_expired(xp, dir, 1, 0); |
1da177e4 LT |
196 | xfrm_pol_put(xp); |
197 | } | |
198 | ||
199 | ||
200 | /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2 | |
201 | * SPD calls. | |
202 | */ | |
203 | ||
dd0fc66f | 204 | struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp) |
1da177e4 LT |
205 | { |
206 | struct xfrm_policy *policy; | |
207 | ||
0da974f4 | 208 | policy = kzalloc(sizeof(struct xfrm_policy), gfp); |
1da177e4 LT |
209 | |
210 | if (policy) { | |
2518c7c2 DM |
211 | INIT_HLIST_NODE(&policy->bydst); |
212 | INIT_HLIST_NODE(&policy->byidx); | |
1da177e4 | 213 | rwlock_init(&policy->lock); |
2518c7c2 | 214 | atomic_set(&policy->refcnt, 1); |
b24b8a24 PE |
215 | setup_timer(&policy->timer, xfrm_policy_timer, |
216 | (unsigned long)policy); | |
1da177e4 LT |
217 | } |
218 | return policy; | |
219 | } | |
220 | EXPORT_SYMBOL(xfrm_policy_alloc); | |
221 | ||
222 | /* Destroy xfrm_policy: descendant resources must be released to this moment. */ | |
223 | ||
64c31b3f | 224 | void xfrm_policy_destroy(struct xfrm_policy *policy) |
1da177e4 | 225 | { |
09a62660 | 226 | BUG_ON(!policy->dead); |
1da177e4 | 227 | |
09a62660 | 228 | BUG_ON(policy->bundles); |
1da177e4 LT |
229 | |
230 | if (del_timer(&policy->timer)) | |
231 | BUG(); | |
232 | ||
df71837d | 233 | security_xfrm_policy_free(policy); |
1da177e4 LT |
234 | kfree(policy); |
235 | } | |
64c31b3f | 236 | EXPORT_SYMBOL(xfrm_policy_destroy); |
1da177e4 LT |
237 | |
238 | static void xfrm_policy_gc_kill(struct xfrm_policy *policy) | |
239 | { | |
240 | struct dst_entry *dst; | |
241 | ||
242 | while ((dst = policy->bundles) != NULL) { | |
243 | policy->bundles = dst->next; | |
244 | dst_free(dst); | |
245 | } | |
246 | ||
247 | if (del_timer(&policy->timer)) | |
248 | atomic_dec(&policy->refcnt); | |
249 | ||
250 | if (atomic_read(&policy->refcnt) > 1) | |
251 | flow_cache_flush(); | |
252 | ||
253 | xfrm_pol_put(policy); | |
254 | } | |
255 | ||
c4028958 | 256 | static void xfrm_policy_gc_task(struct work_struct *work) |
1da177e4 LT |
257 | { |
258 | struct xfrm_policy *policy; | |
2518c7c2 DM |
259 | struct hlist_node *entry, *tmp; |
260 | struct hlist_head gc_list; | |
1da177e4 LT |
261 | |
262 | spin_lock_bh(&xfrm_policy_gc_lock); | |
2518c7c2 DM |
263 | gc_list.first = xfrm_policy_gc_list.first; |
264 | INIT_HLIST_HEAD(&xfrm_policy_gc_list); | |
1da177e4 LT |
265 | spin_unlock_bh(&xfrm_policy_gc_lock); |
266 | ||
2518c7c2 | 267 | hlist_for_each_entry_safe(policy, entry, tmp, &gc_list, bydst) |
1da177e4 | 268 | xfrm_policy_gc_kill(policy); |
1da177e4 LT |
269 | } |
270 | ||
271 | /* Rule must be locked. Release descentant resources, announce | |
272 | * entry dead. The rule must be unlinked from lists to the moment. | |
273 | */ | |
274 | ||
275 | static void xfrm_policy_kill(struct xfrm_policy *policy) | |
276 | { | |
277 | int dead; | |
278 | ||
279 | write_lock_bh(&policy->lock); | |
280 | dead = policy->dead; | |
281 | policy->dead = 1; | |
282 | write_unlock_bh(&policy->lock); | |
283 | ||
284 | if (unlikely(dead)) { | |
285 | WARN_ON(1); | |
286 | return; | |
287 | } | |
288 | ||
289 | spin_lock(&xfrm_policy_gc_lock); | |
2518c7c2 | 290 | hlist_add_head(&policy->bydst, &xfrm_policy_gc_list); |
1da177e4 LT |
291 | spin_unlock(&xfrm_policy_gc_lock); |
292 | ||
293 | schedule_work(&xfrm_policy_gc_work); | |
294 | } | |
295 | ||
2518c7c2 DM |
296 | struct xfrm_policy_hash { |
297 | struct hlist_head *table; | |
298 | unsigned int hmask; | |
299 | }; | |
300 | ||
301 | static struct hlist_head xfrm_policy_inexact[XFRM_POLICY_MAX*2]; | |
302 | static struct xfrm_policy_hash xfrm_policy_bydst[XFRM_POLICY_MAX*2] __read_mostly; | |
303 | static struct hlist_head *xfrm_policy_byidx __read_mostly; | |
304 | static unsigned int xfrm_idx_hmask __read_mostly; | |
305 | static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024; | |
306 | ||
2518c7c2 DM |
307 | static inline unsigned int idx_hash(u32 index) |
308 | { | |
309 | return __idx_hash(index, xfrm_idx_hmask); | |
310 | } | |
311 | ||
2518c7c2 DM |
312 | static struct hlist_head *policy_hash_bysel(struct xfrm_selector *sel, unsigned short family, int dir) |
313 | { | |
314 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
315 | unsigned int hash = __sel_hash(sel, family, hmask); | |
316 | ||
317 | return (hash == hmask + 1 ? | |
318 | &xfrm_policy_inexact[dir] : | |
319 | xfrm_policy_bydst[dir].table + hash); | |
320 | } | |
321 | ||
322 | static struct hlist_head *policy_hash_direct(xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir) | |
323 | { | |
324 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
325 | unsigned int hash = __addr_hash(daddr, saddr, family, hmask); | |
326 | ||
327 | return xfrm_policy_bydst[dir].table + hash; | |
328 | } | |
329 | ||
2518c7c2 DM |
330 | static void xfrm_dst_hash_transfer(struct hlist_head *list, |
331 | struct hlist_head *ndsttable, | |
332 | unsigned int nhashmask) | |
333 | { | |
b791160b | 334 | struct hlist_node *entry, *tmp, *entry0 = NULL; |
2518c7c2 | 335 | struct xfrm_policy *pol; |
b791160b | 336 | unsigned int h0 = 0; |
2518c7c2 | 337 | |
b791160b | 338 | redo: |
2518c7c2 DM |
339 | hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) { |
340 | unsigned int h; | |
341 | ||
342 | h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr, | |
343 | pol->family, nhashmask); | |
b791160b YH |
344 | if (!entry0) { |
345 | hlist_del(entry); | |
346 | hlist_add_head(&pol->bydst, ndsttable+h); | |
347 | h0 = h; | |
348 | } else { | |
349 | if (h != h0) | |
350 | continue; | |
351 | hlist_del(entry); | |
352 | hlist_add_after(entry0, &pol->bydst); | |
353 | } | |
354 | entry0 = entry; | |
355 | } | |
356 | if (!hlist_empty(list)) { | |
357 | entry0 = NULL; | |
358 | goto redo; | |
2518c7c2 DM |
359 | } |
360 | } | |
361 | ||
362 | static void xfrm_idx_hash_transfer(struct hlist_head *list, | |
363 | struct hlist_head *nidxtable, | |
364 | unsigned int nhashmask) | |
365 | { | |
366 | struct hlist_node *entry, *tmp; | |
367 | struct xfrm_policy *pol; | |
368 | ||
369 | hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) { | |
370 | unsigned int h; | |
371 | ||
372 | h = __idx_hash(pol->index, nhashmask); | |
373 | hlist_add_head(&pol->byidx, nidxtable+h); | |
374 | } | |
375 | } | |
376 | ||
377 | static unsigned long xfrm_new_hash_mask(unsigned int old_hmask) | |
378 | { | |
379 | return ((old_hmask + 1) << 1) - 1; | |
380 | } | |
381 | ||
382 | static void xfrm_bydst_resize(int dir) | |
383 | { | |
384 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
385 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); | |
386 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
387 | struct hlist_head *odst = xfrm_policy_bydst[dir].table; | |
44e36b42 | 388 | struct hlist_head *ndst = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
389 | int i; |
390 | ||
391 | if (!ndst) | |
392 | return; | |
393 | ||
394 | write_lock_bh(&xfrm_policy_lock); | |
395 | ||
396 | for (i = hmask; i >= 0; i--) | |
397 | xfrm_dst_hash_transfer(odst + i, ndst, nhashmask); | |
398 | ||
399 | xfrm_policy_bydst[dir].table = ndst; | |
400 | xfrm_policy_bydst[dir].hmask = nhashmask; | |
401 | ||
402 | write_unlock_bh(&xfrm_policy_lock); | |
403 | ||
44e36b42 | 404 | xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
405 | } |
406 | ||
407 | static void xfrm_byidx_resize(int total) | |
408 | { | |
409 | unsigned int hmask = xfrm_idx_hmask; | |
410 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); | |
411 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
412 | struct hlist_head *oidx = xfrm_policy_byidx; | |
44e36b42 | 413 | struct hlist_head *nidx = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
414 | int i; |
415 | ||
416 | if (!nidx) | |
417 | return; | |
418 | ||
419 | write_lock_bh(&xfrm_policy_lock); | |
420 | ||
421 | for (i = hmask; i >= 0; i--) | |
422 | xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask); | |
423 | ||
424 | xfrm_policy_byidx = nidx; | |
425 | xfrm_idx_hmask = nhashmask; | |
426 | ||
427 | write_unlock_bh(&xfrm_policy_lock); | |
428 | ||
44e36b42 | 429 | xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
430 | } |
431 | ||
432 | static inline int xfrm_bydst_should_resize(int dir, int *total) | |
433 | { | |
434 | unsigned int cnt = xfrm_policy_count[dir]; | |
435 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
436 | ||
437 | if (total) | |
438 | *total += cnt; | |
439 | ||
440 | if ((hmask + 1) < xfrm_policy_hashmax && | |
441 | cnt > hmask) | |
442 | return 1; | |
443 | ||
444 | return 0; | |
445 | } | |
446 | ||
447 | static inline int xfrm_byidx_should_resize(int total) | |
448 | { | |
449 | unsigned int hmask = xfrm_idx_hmask; | |
450 | ||
451 | if ((hmask + 1) < xfrm_policy_hashmax && | |
452 | total > hmask) | |
453 | return 1; | |
454 | ||
455 | return 0; | |
456 | } | |
457 | ||
5a6d3416 | 458 | void xfrm_spd_getinfo(struct xfrmk_spdinfo *si) |
ecfd6b18 JHS |
459 | { |
460 | read_lock_bh(&xfrm_policy_lock); | |
461 | si->incnt = xfrm_policy_count[XFRM_POLICY_IN]; | |
462 | si->outcnt = xfrm_policy_count[XFRM_POLICY_OUT]; | |
463 | si->fwdcnt = xfrm_policy_count[XFRM_POLICY_FWD]; | |
464 | si->inscnt = xfrm_policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX]; | |
465 | si->outscnt = xfrm_policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX]; | |
466 | si->fwdscnt = xfrm_policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX]; | |
467 | si->spdhcnt = xfrm_idx_hmask; | |
468 | si->spdhmcnt = xfrm_policy_hashmax; | |
469 | read_unlock_bh(&xfrm_policy_lock); | |
470 | } | |
471 | EXPORT_SYMBOL(xfrm_spd_getinfo); | |
2518c7c2 | 472 | |
ecfd6b18 | 473 | static DEFINE_MUTEX(hash_resize_mutex); |
c4028958 | 474 | static void xfrm_hash_resize(struct work_struct *__unused) |
2518c7c2 DM |
475 | { |
476 | int dir, total; | |
477 | ||
478 | mutex_lock(&hash_resize_mutex); | |
479 | ||
480 | total = 0; | |
481 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
482 | if (xfrm_bydst_should_resize(dir, &total)) | |
483 | xfrm_bydst_resize(dir); | |
484 | } | |
485 | if (xfrm_byidx_should_resize(total)) | |
486 | xfrm_byidx_resize(total); | |
487 | ||
488 | mutex_unlock(&hash_resize_mutex); | |
489 | } | |
490 | ||
c4028958 | 491 | static DECLARE_WORK(xfrm_hash_work, xfrm_hash_resize); |
2518c7c2 | 492 | |
1da177e4 LT |
493 | /* Generate new index... KAME seems to generate them ordered by cost |
494 | * of an absolute inpredictability of ordering of rules. This will not pass. */ | |
4e81bb83 | 495 | static u32 xfrm_gen_index(u8 type, int dir) |
1da177e4 | 496 | { |
1da177e4 LT |
497 | static u32 idx_generator; |
498 | ||
499 | for (;;) { | |
2518c7c2 DM |
500 | struct hlist_node *entry; |
501 | struct hlist_head *list; | |
502 | struct xfrm_policy *p; | |
503 | u32 idx; | |
504 | int found; | |
505 | ||
1da177e4 LT |
506 | idx = (idx_generator | dir); |
507 | idx_generator += 8; | |
508 | if (idx == 0) | |
509 | idx = 8; | |
2518c7c2 DM |
510 | list = xfrm_policy_byidx + idx_hash(idx); |
511 | found = 0; | |
512 | hlist_for_each_entry(p, entry, list, byidx) { | |
513 | if (p->index == idx) { | |
514 | found = 1; | |
1da177e4 | 515 | break; |
2518c7c2 | 516 | } |
1da177e4 | 517 | } |
2518c7c2 | 518 | if (!found) |
1da177e4 LT |
519 | return idx; |
520 | } | |
521 | } | |
522 | ||
2518c7c2 DM |
523 | static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2) |
524 | { | |
525 | u32 *p1 = (u32 *) s1; | |
526 | u32 *p2 = (u32 *) s2; | |
527 | int len = sizeof(struct xfrm_selector) / sizeof(u32); | |
528 | int i; | |
529 | ||
530 | for (i = 0; i < len; i++) { | |
531 | if (p1[i] != p2[i]) | |
532 | return 1; | |
533 | } | |
534 | ||
535 | return 0; | |
536 | } | |
537 | ||
1da177e4 LT |
538 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) |
539 | { | |
2518c7c2 DM |
540 | struct xfrm_policy *pol; |
541 | struct xfrm_policy *delpol; | |
542 | struct hlist_head *chain; | |
a6c7ab55 | 543 | struct hlist_node *entry, *newpos; |
9b78a82c | 544 | struct dst_entry *gc_list; |
1da177e4 LT |
545 | |
546 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
547 | chain = policy_hash_bysel(&policy->selector, policy->family, dir); |
548 | delpol = NULL; | |
549 | newpos = NULL; | |
2518c7c2 | 550 | hlist_for_each_entry(pol, entry, chain, bydst) { |
a6c7ab55 | 551 | if (pol->type == policy->type && |
2518c7c2 | 552 | !selector_cmp(&pol->selector, &policy->selector) && |
a6c7ab55 HX |
553 | xfrm_sec_ctx_match(pol->security, policy->security) && |
554 | !WARN_ON(delpol)) { | |
1da177e4 LT |
555 | if (excl) { |
556 | write_unlock_bh(&xfrm_policy_lock); | |
557 | return -EEXIST; | |
558 | } | |
1da177e4 LT |
559 | delpol = pol; |
560 | if (policy->priority > pol->priority) | |
561 | continue; | |
562 | } else if (policy->priority >= pol->priority) { | |
a6c7ab55 | 563 | newpos = &pol->bydst; |
1da177e4 LT |
564 | continue; |
565 | } | |
1da177e4 LT |
566 | if (delpol) |
567 | break; | |
1da177e4 LT |
568 | } |
569 | if (newpos) | |
2518c7c2 DM |
570 | hlist_add_after(newpos, &policy->bydst); |
571 | else | |
572 | hlist_add_head(&policy->bydst, chain); | |
1da177e4 | 573 | xfrm_pol_hold(policy); |
2518c7c2 | 574 | xfrm_policy_count[dir]++; |
1da177e4 | 575 | atomic_inc(&flow_cache_genid); |
2518c7c2 DM |
576 | if (delpol) { |
577 | hlist_del(&delpol->bydst); | |
578 | hlist_del(&delpol->byidx); | |
579 | xfrm_policy_count[dir]--; | |
580 | } | |
4e81bb83 | 581 | policy->index = delpol ? delpol->index : xfrm_gen_index(policy->type, dir); |
2518c7c2 | 582 | hlist_add_head(&policy->byidx, xfrm_policy_byidx+idx_hash(policy->index)); |
9d729f72 | 583 | policy->curlft.add_time = get_seconds(); |
1da177e4 LT |
584 | policy->curlft.use_time = 0; |
585 | if (!mod_timer(&policy->timer, jiffies + HZ)) | |
586 | xfrm_pol_hold(policy); | |
587 | write_unlock_bh(&xfrm_policy_lock); | |
588 | ||
9b78a82c | 589 | if (delpol) |
1da177e4 | 590 | xfrm_policy_kill(delpol); |
2518c7c2 DM |
591 | else if (xfrm_bydst_should_resize(dir, NULL)) |
592 | schedule_work(&xfrm_hash_work); | |
9b78a82c DM |
593 | |
594 | read_lock_bh(&xfrm_policy_lock); | |
595 | gc_list = NULL; | |
2518c7c2 DM |
596 | entry = &policy->bydst; |
597 | hlist_for_each_entry_continue(policy, entry, bydst) { | |
9b78a82c DM |
598 | struct dst_entry *dst; |
599 | ||
600 | write_lock(&policy->lock); | |
601 | dst = policy->bundles; | |
602 | if (dst) { | |
603 | struct dst_entry *tail = dst; | |
604 | while (tail->next) | |
605 | tail = tail->next; | |
606 | tail->next = gc_list; | |
607 | gc_list = dst; | |
608 | ||
609 | policy->bundles = NULL; | |
610 | } | |
611 | write_unlock(&policy->lock); | |
1da177e4 | 612 | } |
9b78a82c DM |
613 | read_unlock_bh(&xfrm_policy_lock); |
614 | ||
615 | while (gc_list) { | |
616 | struct dst_entry *dst = gc_list; | |
617 | ||
618 | gc_list = dst->next; | |
619 | dst_free(dst); | |
620 | } | |
621 | ||
1da177e4 LT |
622 | return 0; |
623 | } | |
624 | EXPORT_SYMBOL(xfrm_policy_insert); | |
625 | ||
4e81bb83 MN |
626 | struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir, |
627 | struct xfrm_selector *sel, | |
ef41aaa0 EP |
628 | struct xfrm_sec_ctx *ctx, int delete, |
629 | int *err) | |
1da177e4 | 630 | { |
2518c7c2 DM |
631 | struct xfrm_policy *pol, *ret; |
632 | struct hlist_head *chain; | |
633 | struct hlist_node *entry; | |
1da177e4 | 634 | |
ef41aaa0 | 635 | *err = 0; |
1da177e4 | 636 | write_lock_bh(&xfrm_policy_lock); |
2518c7c2 DM |
637 | chain = policy_hash_bysel(sel, sel->family, dir); |
638 | ret = NULL; | |
639 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
640 | if (pol->type == type && | |
641 | !selector_cmp(sel, &pol->selector) && | |
642 | xfrm_sec_ctx_match(ctx, pol->security)) { | |
1da177e4 | 643 | xfrm_pol_hold(pol); |
2518c7c2 | 644 | if (delete) { |
ef41aaa0 EP |
645 | *err = security_xfrm_policy_delete(pol); |
646 | if (*err) { | |
647 | write_unlock_bh(&xfrm_policy_lock); | |
648 | return pol; | |
649 | } | |
2518c7c2 DM |
650 | hlist_del(&pol->bydst); |
651 | hlist_del(&pol->byidx); | |
652 | xfrm_policy_count[dir]--; | |
653 | } | |
654 | ret = pol; | |
1da177e4 LT |
655 | break; |
656 | } | |
657 | } | |
658 | write_unlock_bh(&xfrm_policy_lock); | |
659 | ||
2518c7c2 | 660 | if (ret && delete) { |
1da177e4 | 661 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 662 | xfrm_policy_kill(ret); |
1da177e4 | 663 | } |
2518c7c2 | 664 | return ret; |
1da177e4 | 665 | } |
df71837d | 666 | EXPORT_SYMBOL(xfrm_policy_bysel_ctx); |
1da177e4 | 667 | |
ef41aaa0 EP |
668 | struct xfrm_policy *xfrm_policy_byid(u8 type, int dir, u32 id, int delete, |
669 | int *err) | |
1da177e4 | 670 | { |
2518c7c2 DM |
671 | struct xfrm_policy *pol, *ret; |
672 | struct hlist_head *chain; | |
673 | struct hlist_node *entry; | |
1da177e4 | 674 | |
b5505c6e HX |
675 | *err = -ENOENT; |
676 | if (xfrm_policy_id2dir(id) != dir) | |
677 | return NULL; | |
678 | ||
ef41aaa0 | 679 | *err = 0; |
1da177e4 | 680 | write_lock_bh(&xfrm_policy_lock); |
2518c7c2 DM |
681 | chain = xfrm_policy_byidx + idx_hash(id); |
682 | ret = NULL; | |
683 | hlist_for_each_entry(pol, entry, chain, byidx) { | |
684 | if (pol->type == type && pol->index == id) { | |
1da177e4 | 685 | xfrm_pol_hold(pol); |
2518c7c2 | 686 | if (delete) { |
ef41aaa0 EP |
687 | *err = security_xfrm_policy_delete(pol); |
688 | if (*err) { | |
689 | write_unlock_bh(&xfrm_policy_lock); | |
690 | return pol; | |
691 | } | |
2518c7c2 DM |
692 | hlist_del(&pol->bydst); |
693 | hlist_del(&pol->byidx); | |
694 | xfrm_policy_count[dir]--; | |
695 | } | |
696 | ret = pol; | |
1da177e4 LT |
697 | break; |
698 | } | |
699 | } | |
700 | write_unlock_bh(&xfrm_policy_lock); | |
701 | ||
2518c7c2 | 702 | if (ret && delete) { |
1da177e4 | 703 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 704 | xfrm_policy_kill(ret); |
1da177e4 | 705 | } |
2518c7c2 | 706 | return ret; |
1da177e4 LT |
707 | } |
708 | EXPORT_SYMBOL(xfrm_policy_byid); | |
709 | ||
4aa2e62c JL |
710 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
711 | static inline int | |
712 | xfrm_policy_flush_secctx_check(u8 type, struct xfrm_audit *audit_info) | |
1da177e4 | 713 | { |
4aa2e62c JL |
714 | int dir, err = 0; |
715 | ||
716 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { | |
717 | struct xfrm_policy *pol; | |
718 | struct hlist_node *entry; | |
719 | int i; | |
720 | ||
721 | hlist_for_each_entry(pol, entry, | |
722 | &xfrm_policy_inexact[dir], bydst) { | |
723 | if (pol->type != type) | |
724 | continue; | |
725 | err = security_xfrm_policy_delete(pol); | |
726 | if (err) { | |
ab5f5e8b JL |
727 | xfrm_audit_policy_delete(pol, 0, |
728 | audit_info->loginuid, | |
729 | audit_info->secid); | |
4aa2e62c JL |
730 | return err; |
731 | } | |
7dc12d6d | 732 | } |
4aa2e62c JL |
733 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { |
734 | hlist_for_each_entry(pol, entry, | |
735 | xfrm_policy_bydst[dir].table + i, | |
736 | bydst) { | |
737 | if (pol->type != type) | |
738 | continue; | |
739 | err = security_xfrm_policy_delete(pol); | |
740 | if (err) { | |
ab5f5e8b JL |
741 | xfrm_audit_policy_delete(pol, 0, |
742 | audit_info->loginuid, | |
743 | audit_info->secid); | |
4aa2e62c JL |
744 | return err; |
745 | } | |
746 | } | |
747 | } | |
748 | } | |
749 | return err; | |
750 | } | |
751 | #else | |
752 | static inline int | |
753 | xfrm_policy_flush_secctx_check(u8 type, struct xfrm_audit *audit_info) | |
754 | { | |
755 | return 0; | |
756 | } | |
757 | #endif | |
758 | ||
759 | int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info) | |
760 | { | |
761 | int dir, err = 0; | |
1da177e4 LT |
762 | |
763 | write_lock_bh(&xfrm_policy_lock); | |
4aa2e62c JL |
764 | |
765 | err = xfrm_policy_flush_secctx_check(type, audit_info); | |
766 | if (err) | |
767 | goto out; | |
768 | ||
1da177e4 | 769 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
2518c7c2 DM |
770 | struct xfrm_policy *pol; |
771 | struct hlist_node *entry; | |
ae8c0577 | 772 | int i, killed; |
2518c7c2 | 773 | |
ae8c0577 | 774 | killed = 0; |
2518c7c2 DM |
775 | again1: |
776 | hlist_for_each_entry(pol, entry, | |
777 | &xfrm_policy_inexact[dir], bydst) { | |
778 | if (pol->type != type) | |
779 | continue; | |
780 | hlist_del(&pol->bydst); | |
781 | hlist_del(&pol->byidx); | |
1da177e4 LT |
782 | write_unlock_bh(&xfrm_policy_lock); |
783 | ||
ab5f5e8b JL |
784 | xfrm_audit_policy_delete(pol, 1, audit_info->loginuid, |
785 | audit_info->secid); | |
161a09e7 | 786 | |
2518c7c2 | 787 | xfrm_policy_kill(pol); |
ae8c0577 | 788 | killed++; |
1da177e4 LT |
789 | |
790 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
791 | goto again1; |
792 | } | |
793 | ||
794 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { | |
795 | again2: | |
796 | hlist_for_each_entry(pol, entry, | |
797 | xfrm_policy_bydst[dir].table + i, | |
798 | bydst) { | |
799 | if (pol->type != type) | |
800 | continue; | |
801 | hlist_del(&pol->bydst); | |
802 | hlist_del(&pol->byidx); | |
803 | write_unlock_bh(&xfrm_policy_lock); | |
804 | ||
ab5f5e8b JL |
805 | xfrm_audit_policy_delete(pol, 1, |
806 | audit_info->loginuid, | |
807 | audit_info->secid); | |
2518c7c2 | 808 | xfrm_policy_kill(pol); |
ae8c0577 | 809 | killed++; |
2518c7c2 DM |
810 | |
811 | write_lock_bh(&xfrm_policy_lock); | |
812 | goto again2; | |
813 | } | |
1da177e4 | 814 | } |
2518c7c2 | 815 | |
ae8c0577 | 816 | xfrm_policy_count[dir] -= killed; |
1da177e4 LT |
817 | } |
818 | atomic_inc(&flow_cache_genid); | |
4aa2e62c | 819 | out: |
1da177e4 | 820 | write_unlock_bh(&xfrm_policy_lock); |
4aa2e62c | 821 | return err; |
1da177e4 LT |
822 | } |
823 | EXPORT_SYMBOL(xfrm_policy_flush); | |
824 | ||
4e81bb83 | 825 | int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), |
1da177e4 LT |
826 | void *data) |
827 | { | |
baf5d743 | 828 | struct xfrm_policy *pol, *last = NULL; |
2518c7c2 | 829 | struct hlist_node *entry; |
baf5d743 | 830 | int dir, last_dir = 0, count, error; |
1da177e4 LT |
831 | |
832 | read_lock_bh(&xfrm_policy_lock); | |
2518c7c2 | 833 | count = 0; |
1da177e4 LT |
834 | |
835 | for (dir = 0; dir < 2*XFRM_POLICY_MAX; dir++) { | |
2518c7c2 DM |
836 | struct hlist_head *table = xfrm_policy_bydst[dir].table; |
837 | int i; | |
838 | ||
839 | hlist_for_each_entry(pol, entry, | |
840 | &xfrm_policy_inexact[dir], bydst) { | |
841 | if (pol->type != type) | |
842 | continue; | |
baf5d743 JHS |
843 | if (last) { |
844 | error = func(last, last_dir % XFRM_POLICY_MAX, | |
845 | count, data); | |
846 | if (error) | |
847 | goto out; | |
848 | } | |
849 | last = pol; | |
850 | last_dir = dir; | |
851 | count++; | |
1da177e4 | 852 | } |
2518c7c2 DM |
853 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { |
854 | hlist_for_each_entry(pol, entry, table + i, bydst) { | |
855 | if (pol->type != type) | |
856 | continue; | |
baf5d743 JHS |
857 | if (last) { |
858 | error = func(last, last_dir % XFRM_POLICY_MAX, | |
859 | count, data); | |
860 | if (error) | |
861 | goto out; | |
862 | } | |
863 | last = pol; | |
864 | last_dir = dir; | |
865 | count++; | |
2518c7c2 DM |
866 | } |
867 | } | |
1da177e4 | 868 | } |
baf5d743 JHS |
869 | if (count == 0) { |
870 | error = -ENOENT; | |
871 | goto out; | |
872 | } | |
873 | error = func(last, last_dir % XFRM_POLICY_MAX, 0, data); | |
1da177e4 LT |
874 | out: |
875 | read_unlock_bh(&xfrm_policy_lock); | |
876 | return error; | |
877 | } | |
878 | EXPORT_SYMBOL(xfrm_policy_walk); | |
879 | ||
134b0fc5 JM |
880 | /* |
881 | * Find policy to apply to this flow. | |
882 | * | |
883 | * Returns 0 if policy found, else an -errno. | |
884 | */ | |
2518c7c2 DM |
885 | static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl, |
886 | u8 type, u16 family, int dir) | |
1da177e4 | 887 | { |
2518c7c2 | 888 | struct xfrm_selector *sel = &pol->selector; |
134b0fc5 | 889 | int match, ret = -ESRCH; |
1da177e4 | 890 | |
2518c7c2 DM |
891 | if (pol->family != family || |
892 | pol->type != type) | |
134b0fc5 | 893 | return ret; |
1da177e4 | 894 | |
2518c7c2 | 895 | match = xfrm_selector_match(sel, fl, family); |
134b0fc5 JM |
896 | if (match) |
897 | ret = security_xfrm_policy_lookup(pol, fl->secid, dir); | |
2518c7c2 | 898 | |
134b0fc5 | 899 | return ret; |
2518c7c2 | 900 | } |
1da177e4 | 901 | |
2518c7c2 DM |
902 | static struct xfrm_policy *xfrm_policy_lookup_bytype(u8 type, struct flowi *fl, |
903 | u16 family, u8 dir) | |
904 | { | |
134b0fc5 | 905 | int err; |
2518c7c2 DM |
906 | struct xfrm_policy *pol, *ret; |
907 | xfrm_address_t *daddr, *saddr; | |
908 | struct hlist_node *entry; | |
909 | struct hlist_head *chain; | |
acba48e1 | 910 | u32 priority = ~0U; |
df71837d | 911 | |
2518c7c2 DM |
912 | daddr = xfrm_flowi_daddr(fl, family); |
913 | saddr = xfrm_flowi_saddr(fl, family); | |
914 | if (unlikely(!daddr || !saddr)) | |
915 | return NULL; | |
916 | ||
917 | read_lock_bh(&xfrm_policy_lock); | |
918 | chain = policy_hash_direct(daddr, saddr, family, dir); | |
919 | ret = NULL; | |
920 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
921 | err = xfrm_policy_match(pol, fl, type, family, dir); |
922 | if (err) { | |
923 | if (err == -ESRCH) | |
924 | continue; | |
925 | else { | |
926 | ret = ERR_PTR(err); | |
927 | goto fail; | |
928 | } | |
929 | } else { | |
2518c7c2 | 930 | ret = pol; |
acba48e1 | 931 | priority = ret->priority; |
2518c7c2 DM |
932 | break; |
933 | } | |
934 | } | |
acba48e1 DM |
935 | chain = &xfrm_policy_inexact[dir]; |
936 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
937 | err = xfrm_policy_match(pol, fl, type, family, dir); |
938 | if (err) { | |
939 | if (err == -ESRCH) | |
940 | continue; | |
941 | else { | |
942 | ret = ERR_PTR(err); | |
943 | goto fail; | |
944 | } | |
945 | } else if (pol->priority < priority) { | |
acba48e1 DM |
946 | ret = pol; |
947 | break; | |
1da177e4 LT |
948 | } |
949 | } | |
acba48e1 DM |
950 | if (ret) |
951 | xfrm_pol_hold(ret); | |
134b0fc5 | 952 | fail: |
1da177e4 | 953 | read_unlock_bh(&xfrm_policy_lock); |
4e81bb83 | 954 | |
2518c7c2 | 955 | return ret; |
4e81bb83 MN |
956 | } |
957 | ||
134b0fc5 | 958 | static int xfrm_policy_lookup(struct flowi *fl, u16 family, u8 dir, |
4e81bb83 MN |
959 | void **objp, atomic_t **obj_refp) |
960 | { | |
961 | struct xfrm_policy *pol; | |
134b0fc5 | 962 | int err = 0; |
4e81bb83 MN |
963 | |
964 | #ifdef CONFIG_XFRM_SUB_POLICY | |
965 | pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_SUB, fl, family, dir); | |
134b0fc5 JM |
966 | if (IS_ERR(pol)) { |
967 | err = PTR_ERR(pol); | |
968 | pol = NULL; | |
969 | } | |
970 | if (pol || err) | |
4e81bb83 MN |
971 | goto end; |
972 | #endif | |
973 | pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, fl, family, dir); | |
134b0fc5 JM |
974 | if (IS_ERR(pol)) { |
975 | err = PTR_ERR(pol); | |
976 | pol = NULL; | |
977 | } | |
4e81bb83 | 978 | #ifdef CONFIG_XFRM_SUB_POLICY |
2518c7c2 | 979 | end: |
4e81bb83 | 980 | #endif |
1da177e4 LT |
981 | if ((*objp = (void *) pol) != NULL) |
982 | *obj_refp = &pol->refcnt; | |
134b0fc5 | 983 | return err; |
1da177e4 LT |
984 | } |
985 | ||
df71837d TJ |
986 | static inline int policy_to_flow_dir(int dir) |
987 | { | |
988 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
a716c119 YH |
989 | XFRM_POLICY_OUT == FLOW_DIR_OUT && |
990 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
991 | return dir; | |
992 | switch (dir) { | |
993 | default: | |
994 | case XFRM_POLICY_IN: | |
995 | return FLOW_DIR_IN; | |
996 | case XFRM_POLICY_OUT: | |
997 | return FLOW_DIR_OUT; | |
998 | case XFRM_POLICY_FWD: | |
999 | return FLOW_DIR_FWD; | |
3ff50b79 | 1000 | } |
df71837d TJ |
1001 | } |
1002 | ||
e0d1caa7 | 1003 | static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl) |
1da177e4 LT |
1004 | { |
1005 | struct xfrm_policy *pol; | |
1006 | ||
1007 | read_lock_bh(&xfrm_policy_lock); | |
1008 | if ((pol = sk->sk_policy[dir]) != NULL) { | |
a716c119 | 1009 | int match = xfrm_selector_match(&pol->selector, fl, |
1da177e4 | 1010 | sk->sk_family); |
a716c119 | 1011 | int err = 0; |
df71837d | 1012 | |
3bccfbc7 VY |
1013 | if (match) { |
1014 | err = security_xfrm_policy_lookup(pol, fl->secid, | |
1015 | policy_to_flow_dir(dir)); | |
1016 | if (!err) | |
1017 | xfrm_pol_hold(pol); | |
1018 | else if (err == -ESRCH) | |
1019 | pol = NULL; | |
1020 | else | |
1021 | pol = ERR_PTR(err); | |
1022 | } else | |
1da177e4 LT |
1023 | pol = NULL; |
1024 | } | |
1025 | read_unlock_bh(&xfrm_policy_lock); | |
1026 | return pol; | |
1027 | } | |
1028 | ||
1029 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) | |
1030 | { | |
2518c7c2 DM |
1031 | struct hlist_head *chain = policy_hash_bysel(&pol->selector, |
1032 | pol->family, dir); | |
4e81bb83 | 1033 | |
2518c7c2 DM |
1034 | hlist_add_head(&pol->bydst, chain); |
1035 | hlist_add_head(&pol->byidx, xfrm_policy_byidx+idx_hash(pol->index)); | |
1036 | xfrm_policy_count[dir]++; | |
1da177e4 | 1037 | xfrm_pol_hold(pol); |
2518c7c2 DM |
1038 | |
1039 | if (xfrm_bydst_should_resize(dir, NULL)) | |
1040 | schedule_work(&xfrm_hash_work); | |
1da177e4 LT |
1041 | } |
1042 | ||
1043 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, | |
1044 | int dir) | |
1045 | { | |
2518c7c2 DM |
1046 | if (hlist_unhashed(&pol->bydst)) |
1047 | return NULL; | |
1da177e4 | 1048 | |
2518c7c2 DM |
1049 | hlist_del(&pol->bydst); |
1050 | hlist_del(&pol->byidx); | |
1051 | xfrm_policy_count[dir]--; | |
1052 | ||
1053 | return pol; | |
1da177e4 LT |
1054 | } |
1055 | ||
4666faab | 1056 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir) |
1da177e4 LT |
1057 | { |
1058 | write_lock_bh(&xfrm_policy_lock); | |
1059 | pol = __xfrm_policy_unlink(pol, dir); | |
1060 | write_unlock_bh(&xfrm_policy_lock); | |
1061 | if (pol) { | |
1062 | if (dir < XFRM_POLICY_MAX) | |
1063 | atomic_inc(&flow_cache_genid); | |
1064 | xfrm_policy_kill(pol); | |
4666faab | 1065 | return 0; |
1da177e4 | 1066 | } |
4666faab | 1067 | return -ENOENT; |
1da177e4 | 1068 | } |
a70fcb0b | 1069 | EXPORT_SYMBOL(xfrm_policy_delete); |
1da177e4 LT |
1070 | |
1071 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) | |
1072 | { | |
1073 | struct xfrm_policy *old_pol; | |
1074 | ||
4e81bb83 MN |
1075 | #ifdef CONFIG_XFRM_SUB_POLICY |
1076 | if (pol && pol->type != XFRM_POLICY_TYPE_MAIN) | |
1077 | return -EINVAL; | |
1078 | #endif | |
1079 | ||
1da177e4 LT |
1080 | write_lock_bh(&xfrm_policy_lock); |
1081 | old_pol = sk->sk_policy[dir]; | |
1082 | sk->sk_policy[dir] = pol; | |
1083 | if (pol) { | |
9d729f72 | 1084 | pol->curlft.add_time = get_seconds(); |
4e81bb83 | 1085 | pol->index = xfrm_gen_index(pol->type, XFRM_POLICY_MAX+dir); |
1da177e4 LT |
1086 | __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir); |
1087 | } | |
1088 | if (old_pol) | |
1089 | __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir); | |
1090 | write_unlock_bh(&xfrm_policy_lock); | |
1091 | ||
1092 | if (old_pol) { | |
1093 | xfrm_policy_kill(old_pol); | |
1094 | } | |
1095 | return 0; | |
1096 | } | |
1097 | ||
1098 | static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir) | |
1099 | { | |
1100 | struct xfrm_policy *newp = xfrm_policy_alloc(GFP_ATOMIC); | |
1101 | ||
1102 | if (newp) { | |
1103 | newp->selector = old->selector; | |
df71837d TJ |
1104 | if (security_xfrm_policy_clone(old, newp)) { |
1105 | kfree(newp); | |
1106 | return NULL; /* ENOMEM */ | |
1107 | } | |
1da177e4 LT |
1108 | newp->lft = old->lft; |
1109 | newp->curlft = old->curlft; | |
1110 | newp->action = old->action; | |
1111 | newp->flags = old->flags; | |
1112 | newp->xfrm_nr = old->xfrm_nr; | |
1113 | newp->index = old->index; | |
4e81bb83 | 1114 | newp->type = old->type; |
1da177e4 LT |
1115 | memcpy(newp->xfrm_vec, old->xfrm_vec, |
1116 | newp->xfrm_nr*sizeof(struct xfrm_tmpl)); | |
1117 | write_lock_bh(&xfrm_policy_lock); | |
1118 | __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir); | |
1119 | write_unlock_bh(&xfrm_policy_lock); | |
1120 | xfrm_pol_put(newp); | |
1121 | } | |
1122 | return newp; | |
1123 | } | |
1124 | ||
1125 | int __xfrm_sk_clone_policy(struct sock *sk) | |
1126 | { | |
1127 | struct xfrm_policy *p0 = sk->sk_policy[0], | |
1128 | *p1 = sk->sk_policy[1]; | |
1129 | ||
1130 | sk->sk_policy[0] = sk->sk_policy[1] = NULL; | |
1131 | if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL) | |
1132 | return -ENOMEM; | |
1133 | if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL) | |
1134 | return -ENOMEM; | |
1135 | return 0; | |
1136 | } | |
1137 | ||
a1e59abf PM |
1138 | static int |
1139 | xfrm_get_saddr(xfrm_address_t *local, xfrm_address_t *remote, | |
1140 | unsigned short family) | |
1141 | { | |
1142 | int err; | |
1143 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1144 | ||
1145 | if (unlikely(afinfo == NULL)) | |
1146 | return -EINVAL; | |
1147 | err = afinfo->get_saddr(local, remote); | |
1148 | xfrm_policy_put_afinfo(afinfo); | |
1149 | return err; | |
1150 | } | |
1151 | ||
1da177e4 LT |
1152 | /* Resolve list of templates for the flow, given policy. */ |
1153 | ||
1154 | static int | |
4e81bb83 MN |
1155 | xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl, |
1156 | struct xfrm_state **xfrm, | |
1157 | unsigned short family) | |
1da177e4 LT |
1158 | { |
1159 | int nx; | |
1160 | int i, error; | |
1161 | xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); | |
1162 | xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); | |
a1e59abf | 1163 | xfrm_address_t tmp; |
1da177e4 LT |
1164 | |
1165 | for (nx=0, i = 0; i < policy->xfrm_nr; i++) { | |
1166 | struct xfrm_state *x; | |
1167 | xfrm_address_t *remote = daddr; | |
1168 | xfrm_address_t *local = saddr; | |
1169 | struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; | |
1170 | ||
48b8d783 JK |
1171 | if (tmpl->mode == XFRM_MODE_TUNNEL || |
1172 | tmpl->mode == XFRM_MODE_BEET) { | |
1da177e4 LT |
1173 | remote = &tmpl->id.daddr; |
1174 | local = &tmpl->saddr; | |
76b3f055 | 1175 | family = tmpl->encap_family; |
a1e59abf PM |
1176 | if (xfrm_addr_any(local, family)) { |
1177 | error = xfrm_get_saddr(&tmp, remote, family); | |
1178 | if (error) | |
1179 | goto fail; | |
1180 | local = &tmp; | |
1181 | } | |
1da177e4 LT |
1182 | } |
1183 | ||
1184 | x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); | |
1185 | ||
1186 | if (x && x->km.state == XFRM_STATE_VALID) { | |
1187 | xfrm[nx++] = x; | |
1188 | daddr = remote; | |
1189 | saddr = local; | |
1190 | continue; | |
1191 | } | |
1192 | if (x) { | |
1193 | error = (x->km.state == XFRM_STATE_ERROR ? | |
1194 | -EINVAL : -EAGAIN); | |
1195 | xfrm_state_put(x); | |
1196 | } | |
1197 | ||
1198 | if (!tmpl->optional) | |
1199 | goto fail; | |
1200 | } | |
1201 | return nx; | |
1202 | ||
1203 | fail: | |
1204 | for (nx--; nx>=0; nx--) | |
1205 | xfrm_state_put(xfrm[nx]); | |
1206 | return error; | |
1207 | } | |
1208 | ||
4e81bb83 MN |
1209 | static int |
1210 | xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl, | |
1211 | struct xfrm_state **xfrm, | |
1212 | unsigned short family) | |
1213 | { | |
41a49cc3 MN |
1214 | struct xfrm_state *tp[XFRM_MAX_DEPTH]; |
1215 | struct xfrm_state **tpp = (npols > 1) ? tp : xfrm; | |
4e81bb83 MN |
1216 | int cnx = 0; |
1217 | int error; | |
1218 | int ret; | |
1219 | int i; | |
1220 | ||
1221 | for (i = 0; i < npols; i++) { | |
1222 | if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
1223 | error = -ENOBUFS; | |
1224 | goto fail; | |
1225 | } | |
41a49cc3 MN |
1226 | |
1227 | ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family); | |
4e81bb83 MN |
1228 | if (ret < 0) { |
1229 | error = ret; | |
1230 | goto fail; | |
1231 | } else | |
1232 | cnx += ret; | |
1233 | } | |
1234 | ||
41a49cc3 MN |
1235 | /* found states are sorted for outbound processing */ |
1236 | if (npols > 1) | |
1237 | xfrm_state_sort(xfrm, tpp, cnx, family); | |
1238 | ||
4e81bb83 MN |
1239 | return cnx; |
1240 | ||
1241 | fail: | |
1242 | for (cnx--; cnx>=0; cnx--) | |
41a49cc3 | 1243 | xfrm_state_put(tpp[cnx]); |
4e81bb83 MN |
1244 | return error; |
1245 | ||
1246 | } | |
1247 | ||
1da177e4 LT |
1248 | /* Check that the bundle accepts the flow and its components are |
1249 | * still valid. | |
1250 | */ | |
1251 | ||
1252 | static struct dst_entry * | |
1253 | xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short family) | |
1254 | { | |
1255 | struct dst_entry *x; | |
1256 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1257 | if (unlikely(afinfo == NULL)) | |
1258 | return ERR_PTR(-EINVAL); | |
1259 | x = afinfo->find_bundle(fl, policy); | |
1260 | xfrm_policy_put_afinfo(afinfo); | |
1261 | return x; | |
1262 | } | |
1263 | ||
25ee3286 HX |
1264 | static inline int xfrm_get_tos(struct flowi *fl, int family) |
1265 | { | |
1266 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1267 | int tos; | |
1da177e4 | 1268 | |
25ee3286 HX |
1269 | if (!afinfo) |
1270 | return -EINVAL; | |
1271 | ||
1272 | tos = afinfo->get_tos(fl); | |
1273 | ||
1274 | xfrm_policy_put_afinfo(afinfo); | |
1275 | ||
1276 | return tos; | |
1277 | } | |
1278 | ||
1279 | static inline struct xfrm_dst *xfrm_alloc_dst(int family) | |
1da177e4 | 1280 | { |
1da177e4 | 1281 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
25ee3286 HX |
1282 | struct xfrm_dst *xdst; |
1283 | ||
1284 | if (!afinfo) | |
1285 | return ERR_PTR(-EINVAL); | |
1286 | ||
1287 | xdst = dst_alloc(afinfo->dst_ops) ?: ERR_PTR(-ENOBUFS); | |
1288 | ||
1289 | xfrm_policy_put_afinfo(afinfo); | |
1290 | ||
1291 | return xdst; | |
1292 | } | |
1293 | ||
a1b05140 MN |
1294 | static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst, |
1295 | int nfheader_len) | |
1296 | { | |
1297 | struct xfrm_policy_afinfo *afinfo = | |
1298 | xfrm_policy_get_afinfo(dst->ops->family); | |
1299 | int err; | |
1300 | ||
1301 | if (!afinfo) | |
1302 | return -EINVAL; | |
1303 | ||
1304 | err = afinfo->init_path(path, dst, nfheader_len); | |
1305 | ||
1306 | xfrm_policy_put_afinfo(afinfo); | |
1307 | ||
1308 | return err; | |
1309 | } | |
1310 | ||
25ee3286 HX |
1311 | static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev) |
1312 | { | |
1313 | struct xfrm_policy_afinfo *afinfo = | |
1314 | xfrm_policy_get_afinfo(xdst->u.dst.ops->family); | |
1315 | int err; | |
1316 | ||
1317 | if (!afinfo) | |
1da177e4 | 1318 | return -EINVAL; |
25ee3286 HX |
1319 | |
1320 | err = afinfo->fill_dst(xdst, dev); | |
1321 | ||
1da177e4 | 1322 | xfrm_policy_put_afinfo(afinfo); |
25ee3286 | 1323 | |
1da177e4 LT |
1324 | return err; |
1325 | } | |
1326 | ||
25ee3286 HX |
1327 | /* Allocate chain of dst_entry's, attach known xfrm's, calculate |
1328 | * all the metrics... Shortly, bundle a bundle. | |
1329 | */ | |
1330 | ||
1331 | static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy, | |
1332 | struct xfrm_state **xfrm, int nx, | |
1333 | struct flowi *fl, | |
1334 | struct dst_entry *dst) | |
1335 | { | |
1336 | unsigned long now = jiffies; | |
1337 | struct net_device *dev; | |
1338 | struct dst_entry *dst_prev = NULL; | |
1339 | struct dst_entry *dst0 = NULL; | |
1340 | int i = 0; | |
1341 | int err; | |
1342 | int header_len = 0; | |
a1b05140 | 1343 | int nfheader_len = 0; |
25ee3286 HX |
1344 | int trailer_len = 0; |
1345 | int tos; | |
1346 | int family = policy->selector.family; | |
1347 | ||
1348 | tos = xfrm_get_tos(fl, family); | |
1349 | err = tos; | |
1350 | if (tos < 0) | |
1351 | goto put_states; | |
1352 | ||
1353 | dst_hold(dst); | |
1354 | ||
1355 | for (; i < nx; i++) { | |
1356 | struct xfrm_dst *xdst = xfrm_alloc_dst(family); | |
1357 | struct dst_entry *dst1 = &xdst->u.dst; | |
1358 | ||
1359 | err = PTR_ERR(xdst); | |
1360 | if (IS_ERR(xdst)) { | |
1361 | dst_release(dst); | |
1362 | goto put_states; | |
1363 | } | |
1364 | ||
1365 | if (!dst_prev) | |
1366 | dst0 = dst1; | |
1367 | else { | |
1368 | dst_prev->child = dst_clone(dst1); | |
1369 | dst1->flags |= DST_NOHASH; | |
1370 | } | |
1371 | ||
1372 | xdst->route = dst; | |
1373 | memcpy(&dst1->metrics, &dst->metrics, sizeof(dst->metrics)); | |
1374 | ||
1375 | if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) { | |
1376 | family = xfrm[i]->props.family; | |
1377 | dst = xfrm_dst_lookup(xfrm[i], tos, family); | |
1378 | err = PTR_ERR(dst); | |
1379 | if (IS_ERR(dst)) | |
1380 | goto put_states; | |
1381 | } else | |
1382 | dst_hold(dst); | |
1383 | ||
1384 | dst1->xfrm = xfrm[i]; | |
1385 | xdst->genid = xfrm[i]->genid; | |
1386 | ||
1387 | dst1->obsolete = -1; | |
1388 | dst1->flags |= DST_HOST; | |
1389 | dst1->lastuse = now; | |
1390 | ||
1391 | dst1->input = dst_discard; | |
1392 | dst1->output = xfrm[i]->outer_mode->afinfo->output; | |
1393 | ||
1394 | dst1->next = dst_prev; | |
1395 | dst_prev = dst1; | |
1396 | ||
1397 | header_len += xfrm[i]->props.header_len; | |
a1b05140 MN |
1398 | if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT) |
1399 | nfheader_len += xfrm[i]->props.header_len; | |
25ee3286 HX |
1400 | trailer_len += xfrm[i]->props.trailer_len; |
1401 | } | |
1402 | ||
1403 | dst_prev->child = dst; | |
1404 | dst0->path = dst; | |
1405 | ||
1406 | err = -ENODEV; | |
1407 | dev = dst->dev; | |
1408 | if (!dev) | |
1409 | goto free_dst; | |
1410 | ||
1411 | /* Copy neighbout for reachability confirmation */ | |
1412 | dst0->neighbour = neigh_clone(dst->neighbour); | |
1413 | ||
a1b05140 | 1414 | xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len); |
25ee3286 HX |
1415 | xfrm_init_pmtu(dst_prev); |
1416 | ||
1417 | for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) { | |
1418 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev; | |
1419 | ||
1420 | err = xfrm_fill_dst(xdst, dev); | |
1421 | if (err) | |
1422 | goto free_dst; | |
1423 | ||
1424 | dst_prev->header_len = header_len; | |
1425 | dst_prev->trailer_len = trailer_len; | |
1426 | header_len -= xdst->u.dst.xfrm->props.header_len; | |
1427 | trailer_len -= xdst->u.dst.xfrm->props.trailer_len; | |
1428 | } | |
1429 | ||
1430 | out: | |
1431 | return dst0; | |
1432 | ||
1433 | put_states: | |
1434 | for (; i < nx; i++) | |
1435 | xfrm_state_put(xfrm[i]); | |
1436 | free_dst: | |
1437 | if (dst0) | |
1438 | dst_free(dst0); | |
1439 | dst0 = ERR_PTR(err); | |
1440 | goto out; | |
1441 | } | |
1442 | ||
157bfc25 MN |
1443 | static int inline |
1444 | xfrm_dst_alloc_copy(void **target, void *src, int size) | |
1445 | { | |
1446 | if (!*target) { | |
1447 | *target = kmalloc(size, GFP_ATOMIC); | |
1448 | if (!*target) | |
1449 | return -ENOMEM; | |
1450 | } | |
1451 | memcpy(*target, src, size); | |
1452 | return 0; | |
1453 | } | |
1454 | ||
1455 | static int inline | |
1456 | xfrm_dst_update_parent(struct dst_entry *dst, struct xfrm_selector *sel) | |
1457 | { | |
1458 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1459 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1460 | return xfrm_dst_alloc_copy((void **)&(xdst->partner), | |
1461 | sel, sizeof(*sel)); | |
1462 | #else | |
1463 | return 0; | |
1464 | #endif | |
1465 | } | |
1466 | ||
1467 | static int inline | |
1468 | xfrm_dst_update_origin(struct dst_entry *dst, struct flowi *fl) | |
1469 | { | |
1470 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1471 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1472 | return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl)); | |
1473 | #else | |
1474 | return 0; | |
1475 | #endif | |
1476 | } | |
1da177e4 LT |
1477 | |
1478 | static int stale_bundle(struct dst_entry *dst); | |
1479 | ||
1480 | /* Main function: finds/creates a bundle for given flow. | |
1481 | * | |
1482 | * At the moment we eat a raw IP route. Mostly to speed up lookups | |
1483 | * on interfaces with disabled IPsec. | |
1484 | */ | |
14e50e57 DM |
1485 | int __xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl, |
1486 | struct sock *sk, int flags) | |
1da177e4 LT |
1487 | { |
1488 | struct xfrm_policy *policy; | |
4e81bb83 MN |
1489 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
1490 | int npols; | |
1491 | int pol_dead; | |
1492 | int xfrm_nr; | |
1493 | int pi; | |
1da177e4 LT |
1494 | struct xfrm_state *xfrm[XFRM_MAX_DEPTH]; |
1495 | struct dst_entry *dst, *dst_orig = *dst_p; | |
1496 | int nx = 0; | |
1497 | int err; | |
1498 | u32 genid; | |
42cf93cd | 1499 | u16 family; |
df71837d | 1500 | u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT); |
e0d1caa7 | 1501 | |
1da177e4 LT |
1502 | restart: |
1503 | genid = atomic_read(&flow_cache_genid); | |
1504 | policy = NULL; | |
4e81bb83 MN |
1505 | for (pi = 0; pi < ARRAY_SIZE(pols); pi++) |
1506 | pols[pi] = NULL; | |
1507 | npols = 0; | |
1508 | pol_dead = 0; | |
1509 | xfrm_nr = 0; | |
1510 | ||
f7944fb1 | 1511 | if (sk && sk->sk_policy[XFRM_POLICY_OUT]) { |
e0d1caa7 | 1512 | policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl); |
75b8c133 | 1513 | err = PTR_ERR(policy); |
0aa64774 MN |
1514 | if (IS_ERR(policy)) { |
1515 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLERROR); | |
75b8c133 | 1516 | goto dropdst; |
0aa64774 | 1517 | } |
3bccfbc7 | 1518 | } |
1da177e4 LT |
1519 | |
1520 | if (!policy) { | |
1521 | /* To accelerate a bit... */ | |
2518c7c2 DM |
1522 | if ((dst_orig->flags & DST_NOXFRM) || |
1523 | !xfrm_policy_count[XFRM_POLICY_OUT]) | |
8b7817f3 | 1524 | goto nopol; |
1da177e4 | 1525 | |
e0d1caa7 | 1526 | policy = flow_cache_lookup(fl, dst_orig->ops->family, |
42cf93cd | 1527 | dir, xfrm_policy_lookup); |
75b8c133 | 1528 | err = PTR_ERR(policy); |
d66e37a9 MN |
1529 | if (IS_ERR(policy)) { |
1530 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLERROR); | |
75b8c133 | 1531 | goto dropdst; |
d66e37a9 | 1532 | } |
1da177e4 LT |
1533 | } |
1534 | ||
1535 | if (!policy) | |
8b7817f3 | 1536 | goto nopol; |
1da177e4 | 1537 | |
42cf93cd | 1538 | family = dst_orig->ops->family; |
4e81bb83 MN |
1539 | pols[0] = policy; |
1540 | npols ++; | |
1541 | xfrm_nr += pols[0]->xfrm_nr; | |
1da177e4 | 1542 | |
aef21785 | 1543 | err = -ENOENT; |
8b7817f3 HX |
1544 | if ((flags & XFRM_LOOKUP_ICMP) && !(policy->flags & XFRM_POLICY_ICMP)) |
1545 | goto error; | |
1546 | ||
1547 | policy->curlft.use_time = get_seconds(); | |
1548 | ||
1da177e4 | 1549 | switch (policy->action) { |
5e5234ff | 1550 | default: |
1da177e4 LT |
1551 | case XFRM_POLICY_BLOCK: |
1552 | /* Prohibit the flow */ | |
0aa64774 | 1553 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLBLOCK); |
e104411b PM |
1554 | err = -EPERM; |
1555 | goto error; | |
1da177e4 LT |
1556 | |
1557 | case XFRM_POLICY_ALLOW: | |
4e81bb83 | 1558 | #ifndef CONFIG_XFRM_SUB_POLICY |
1da177e4 LT |
1559 | if (policy->xfrm_nr == 0) { |
1560 | /* Flow passes not transformed. */ | |
1561 | xfrm_pol_put(policy); | |
1562 | return 0; | |
1563 | } | |
4e81bb83 | 1564 | #endif |
1da177e4 LT |
1565 | |
1566 | /* Try to find matching bundle. | |
1567 | * | |
1568 | * LATER: help from flow cache. It is optional, this | |
1569 | * is required only for output policy. | |
1570 | */ | |
1571 | dst = xfrm_find_bundle(fl, policy, family); | |
1572 | if (IS_ERR(dst)) { | |
0aa64774 | 1573 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR); |
e104411b PM |
1574 | err = PTR_ERR(dst); |
1575 | goto error; | |
1da177e4 LT |
1576 | } |
1577 | ||
1578 | if (dst) | |
1579 | break; | |
1580 | ||
4e81bb83 MN |
1581 | #ifdef CONFIG_XFRM_SUB_POLICY |
1582 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1583 | pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, | |
1584 | fl, family, | |
1585 | XFRM_POLICY_OUT); | |
1586 | if (pols[1]) { | |
134b0fc5 | 1587 | if (IS_ERR(pols[1])) { |
0aa64774 | 1588 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLERROR); |
134b0fc5 JM |
1589 | err = PTR_ERR(pols[1]); |
1590 | goto error; | |
1591 | } | |
4e81bb83 | 1592 | if (pols[1]->action == XFRM_POLICY_BLOCK) { |
0aa64774 | 1593 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLBLOCK); |
4e81bb83 MN |
1594 | err = -EPERM; |
1595 | goto error; | |
1596 | } | |
1597 | npols ++; | |
1598 | xfrm_nr += pols[1]->xfrm_nr; | |
1599 | } | |
1600 | } | |
1601 | ||
1602 | /* | |
1603 | * Because neither flowi nor bundle information knows about | |
1604 | * transformation template size. On more than one policy usage | |
1605 | * we can realize whether all of them is bypass or not after | |
1606 | * they are searched. See above not-transformed bypass | |
1607 | * is surrounded by non-sub policy configuration, too. | |
1608 | */ | |
1609 | if (xfrm_nr == 0) { | |
1610 | /* Flow passes not transformed. */ | |
1611 | xfrm_pols_put(pols, npols); | |
1612 | return 0; | |
1613 | } | |
1614 | ||
1615 | #endif | |
1616 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); | |
1da177e4 LT |
1617 | |
1618 | if (unlikely(nx<0)) { | |
1619 | err = nx; | |
14e50e57 DM |
1620 | if (err == -EAGAIN && sysctl_xfrm_larval_drop) { |
1621 | /* EREMOTE tells the caller to generate | |
1622 | * a one-shot blackhole route. | |
1623 | */ | |
d66e37a9 | 1624 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES); |
14e50e57 DM |
1625 | xfrm_pol_put(policy); |
1626 | return -EREMOTE; | |
1627 | } | |
815f4e57 | 1628 | if (err == -EAGAIN && (flags & XFRM_LOOKUP_WAIT)) { |
1da177e4 LT |
1629 | DECLARE_WAITQUEUE(wait, current); |
1630 | ||
1631 | add_wait_queue(&km_waitq, &wait); | |
1632 | set_current_state(TASK_INTERRUPTIBLE); | |
1633 | schedule(); | |
1634 | set_current_state(TASK_RUNNING); | |
1635 | remove_wait_queue(&km_waitq, &wait); | |
1636 | ||
4e81bb83 | 1637 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); |
1da177e4 LT |
1638 | |
1639 | if (nx == -EAGAIN && signal_pending(current)) { | |
0aa64774 | 1640 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES); |
1da177e4 LT |
1641 | err = -ERESTART; |
1642 | goto error; | |
1643 | } | |
1644 | if (nx == -EAGAIN || | |
1645 | genid != atomic_read(&flow_cache_genid)) { | |
4e81bb83 | 1646 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1647 | goto restart; |
1648 | } | |
1649 | err = nx; | |
1650 | } | |
0aa64774 MN |
1651 | if (err < 0) { |
1652 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES); | |
1da177e4 | 1653 | goto error; |
0aa64774 | 1654 | } |
1da177e4 LT |
1655 | } |
1656 | if (nx == 0) { | |
1657 | /* Flow passes not transformed. */ | |
4e81bb83 | 1658 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1659 | return 0; |
1660 | } | |
1661 | ||
25ee3286 HX |
1662 | dst = xfrm_bundle_create(policy, xfrm, nx, fl, dst_orig); |
1663 | err = PTR_ERR(dst); | |
0aa64774 MN |
1664 | if (IS_ERR(dst)) { |
1665 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLEGENERROR); | |
1da177e4 | 1666 | goto error; |
0aa64774 | 1667 | } |
1da177e4 | 1668 | |
4e81bb83 MN |
1669 | for (pi = 0; pi < npols; pi++) { |
1670 | read_lock_bh(&pols[pi]->lock); | |
1671 | pol_dead |= pols[pi]->dead; | |
1672 | read_unlock_bh(&pols[pi]->lock); | |
1673 | } | |
1674 | ||
1da177e4 | 1675 | write_lock_bh(&policy->lock); |
4e81bb83 | 1676 | if (unlikely(pol_dead || stale_bundle(dst))) { |
1da177e4 LT |
1677 | /* Wow! While we worked on resolving, this |
1678 | * policy has gone. Retry. It is not paranoia, | |
1679 | * we just cannot enlist new bundle to dead object. | |
1680 | * We can't enlist stable bundles either. | |
1681 | */ | |
1682 | write_unlock_bh(&policy->lock); | |
1da177e4 LT |
1683 | if (dst) |
1684 | dst_free(dst); | |
00de651d | 1685 | |
0aa64774 MN |
1686 | if (pol_dead) |
1687 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLDEAD); | |
1688 | else | |
1689 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR); | |
00de651d HX |
1690 | err = -EHOSTUNREACH; |
1691 | goto error; | |
1da177e4 | 1692 | } |
157bfc25 MN |
1693 | |
1694 | if (npols > 1) | |
1695 | err = xfrm_dst_update_parent(dst, &pols[1]->selector); | |
1696 | else | |
1697 | err = xfrm_dst_update_origin(dst, fl); | |
1698 | if (unlikely(err)) { | |
1699 | write_unlock_bh(&policy->lock); | |
1700 | if (dst) | |
1701 | dst_free(dst); | |
0aa64774 | 1702 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR); |
157bfc25 MN |
1703 | goto error; |
1704 | } | |
1705 | ||
1da177e4 LT |
1706 | dst->next = policy->bundles; |
1707 | policy->bundles = dst; | |
1708 | dst_hold(dst); | |
1709 | write_unlock_bh(&policy->lock); | |
1710 | } | |
1711 | *dst_p = dst; | |
1712 | dst_release(dst_orig); | |
a716c119 | 1713 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1714 | return 0; |
1715 | ||
1716 | error: | |
4e81bb83 | 1717 | xfrm_pols_put(pols, npols); |
75b8c133 HX |
1718 | dropdst: |
1719 | dst_release(dst_orig); | |
1da177e4 LT |
1720 | *dst_p = NULL; |
1721 | return err; | |
8b7817f3 HX |
1722 | |
1723 | nopol: | |
aef21785 | 1724 | err = -ENOENT; |
8b7817f3 HX |
1725 | if (flags & XFRM_LOOKUP_ICMP) |
1726 | goto dropdst; | |
1727 | return 0; | |
1da177e4 | 1728 | } |
14e50e57 DM |
1729 | EXPORT_SYMBOL(__xfrm_lookup); |
1730 | ||
1731 | int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl, | |
1732 | struct sock *sk, int flags) | |
1733 | { | |
1734 | int err = __xfrm_lookup(dst_p, fl, sk, flags); | |
1735 | ||
1736 | if (err == -EREMOTE) { | |
1737 | dst_release(*dst_p); | |
1738 | *dst_p = NULL; | |
1739 | err = -EAGAIN; | |
1740 | } | |
1741 | ||
1742 | return err; | |
1743 | } | |
1da177e4 LT |
1744 | EXPORT_SYMBOL(xfrm_lookup); |
1745 | ||
df0ba92a MN |
1746 | static inline int |
1747 | xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl) | |
1748 | { | |
1749 | struct xfrm_state *x; | |
df0ba92a MN |
1750 | |
1751 | if (!skb->sp || idx < 0 || idx >= skb->sp->len) | |
1752 | return 0; | |
1753 | x = skb->sp->xvec[idx]; | |
1754 | if (!x->type->reject) | |
1755 | return 0; | |
1ecafede | 1756 | return x->type->reject(x, skb, fl); |
df0ba92a MN |
1757 | } |
1758 | ||
1da177e4 LT |
1759 | /* When skb is transformed back to its "native" form, we have to |
1760 | * check policy restrictions. At the moment we make this in maximally | |
1761 | * stupid way. Shame on me. :-) Of course, connected sockets must | |
1762 | * have policy cached at them. | |
1763 | */ | |
1764 | ||
1765 | static inline int | |
a716c119 | 1766 | xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x, |
1da177e4 LT |
1767 | unsigned short family) |
1768 | { | |
1769 | if (xfrm_state_kern(x)) | |
928ba416 | 1770 | return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family); |
1da177e4 LT |
1771 | return x->id.proto == tmpl->id.proto && |
1772 | (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && | |
1773 | (x->props.reqid == tmpl->reqid || !tmpl->reqid) && | |
1774 | x->props.mode == tmpl->mode && | |
f3bd4840 MN |
1775 | ((tmpl->aalgos & (1<<x->props.aalgo)) || |
1776 | !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) && | |
7e49e6de MN |
1777 | !(x->props.mode != XFRM_MODE_TRANSPORT && |
1778 | xfrm_state_addr_cmp(tmpl, x, family)); | |
1da177e4 LT |
1779 | } |
1780 | ||
df0ba92a MN |
1781 | /* |
1782 | * 0 or more than 0 is returned when validation is succeeded (either bypass | |
1783 | * because of optional transport mode, or next index of the mathced secpath | |
1784 | * state with the template. | |
1785 | * -1 is returned when no matching template is found. | |
1786 | * Otherwise "-2 - errored_index" is returned. | |
1787 | */ | |
1da177e4 LT |
1788 | static inline int |
1789 | xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start, | |
1790 | unsigned short family) | |
1791 | { | |
1792 | int idx = start; | |
1793 | ||
1794 | if (tmpl->optional) { | |
7e49e6de | 1795 | if (tmpl->mode == XFRM_MODE_TRANSPORT) |
1da177e4 LT |
1796 | return start; |
1797 | } else | |
1798 | start = -1; | |
1799 | for (; idx < sp->len; idx++) { | |
dbe5b4aa | 1800 | if (xfrm_state_ok(tmpl, sp->xvec[idx], family)) |
1da177e4 | 1801 | return ++idx; |
df0ba92a MN |
1802 | if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) { |
1803 | if (start == -1) | |
1804 | start = -2-idx; | |
1da177e4 | 1805 | break; |
df0ba92a | 1806 | } |
1da177e4 LT |
1807 | } |
1808 | return start; | |
1809 | } | |
1810 | ||
d5422efe HX |
1811 | int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, |
1812 | unsigned int family, int reverse) | |
1da177e4 LT |
1813 | { |
1814 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
e0d1caa7 | 1815 | int err; |
1da177e4 LT |
1816 | |
1817 | if (unlikely(afinfo == NULL)) | |
1818 | return -EAFNOSUPPORT; | |
1819 | ||
d5422efe | 1820 | afinfo->decode_session(skb, fl, reverse); |
beb8d13b | 1821 | err = security_xfrm_decode_session(skb, &fl->secid); |
1da177e4 | 1822 | xfrm_policy_put_afinfo(afinfo); |
e0d1caa7 | 1823 | return err; |
1da177e4 | 1824 | } |
d5422efe | 1825 | EXPORT_SYMBOL(__xfrm_decode_session); |
1da177e4 | 1826 | |
df0ba92a | 1827 | static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp) |
1da177e4 LT |
1828 | { |
1829 | for (; k < sp->len; k++) { | |
df0ba92a | 1830 | if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) { |
d1d9facf | 1831 | *idxp = k; |
1da177e4 | 1832 | return 1; |
df0ba92a | 1833 | } |
1da177e4 LT |
1834 | } |
1835 | ||
1836 | return 0; | |
1837 | } | |
1838 | ||
a716c119 | 1839 | int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, |
1da177e4 LT |
1840 | unsigned short family) |
1841 | { | |
1842 | struct xfrm_policy *pol; | |
4e81bb83 MN |
1843 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
1844 | int npols = 0; | |
1845 | int xfrm_nr; | |
1846 | int pi; | |
d5422efe | 1847 | int reverse; |
1da177e4 | 1848 | struct flowi fl; |
d5422efe | 1849 | u8 fl_dir; |
df0ba92a | 1850 | int xerr_idx = -1; |
1da177e4 | 1851 | |
d5422efe HX |
1852 | reverse = dir & ~XFRM_POLICY_MASK; |
1853 | dir &= XFRM_POLICY_MASK; | |
1854 | fl_dir = policy_to_flow_dir(dir); | |
1855 | ||
0aa64774 MN |
1856 | if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) { |
1857 | XFRM_INC_STATS(LINUX_MIB_XFRMINHDRERROR); | |
1da177e4 | 1858 | return 0; |
0aa64774 MN |
1859 | } |
1860 | ||
eb9c7ebe | 1861 | nf_nat_decode_session(skb, &fl, family); |
1da177e4 LT |
1862 | |
1863 | /* First, check used SA against their selectors. */ | |
1864 | if (skb->sp) { | |
1865 | int i; | |
1866 | ||
1867 | for (i=skb->sp->len-1; i>=0; i--) { | |
dbe5b4aa | 1868 | struct xfrm_state *x = skb->sp->xvec[i]; |
0aa64774 MN |
1869 | if (!xfrm_selector_match(&x->sel, &fl, family)) { |
1870 | XFRM_INC_STATS(LINUX_MIB_XFRMINSTATEMISMATCH); | |
1da177e4 | 1871 | return 0; |
0aa64774 | 1872 | } |
1da177e4 LT |
1873 | } |
1874 | } | |
1875 | ||
1876 | pol = NULL; | |
3bccfbc7 | 1877 | if (sk && sk->sk_policy[dir]) { |
e0d1caa7 | 1878 | pol = xfrm_sk_policy_lookup(sk, dir, &fl); |
0aa64774 MN |
1879 | if (IS_ERR(pol)) { |
1880 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR); | |
3bccfbc7 | 1881 | return 0; |
0aa64774 | 1882 | } |
3bccfbc7 | 1883 | } |
1da177e4 LT |
1884 | |
1885 | if (!pol) | |
e0d1caa7 | 1886 | pol = flow_cache_lookup(&fl, family, fl_dir, |
1da177e4 LT |
1887 | xfrm_policy_lookup); |
1888 | ||
0aa64774 MN |
1889 | if (IS_ERR(pol)) { |
1890 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR); | |
134b0fc5 | 1891 | return 0; |
0aa64774 | 1892 | } |
134b0fc5 | 1893 | |
df0ba92a | 1894 | if (!pol) { |
d1d9facf | 1895 | if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) { |
df0ba92a | 1896 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
0aa64774 | 1897 | XFRM_INC_STATS(LINUX_MIB_XFRMINNOPOLS); |
df0ba92a MN |
1898 | return 0; |
1899 | } | |
1900 | return 1; | |
1901 | } | |
1da177e4 | 1902 | |
9d729f72 | 1903 | pol->curlft.use_time = get_seconds(); |
1da177e4 | 1904 | |
4e81bb83 MN |
1905 | pols[0] = pol; |
1906 | npols ++; | |
1907 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1908 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1909 | pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, | |
1910 | &fl, family, | |
1911 | XFRM_POLICY_IN); | |
1912 | if (pols[1]) { | |
0aa64774 MN |
1913 | if (IS_ERR(pols[1])) { |
1914 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR); | |
134b0fc5 | 1915 | return 0; |
0aa64774 | 1916 | } |
9d729f72 | 1917 | pols[1]->curlft.use_time = get_seconds(); |
4e81bb83 MN |
1918 | npols ++; |
1919 | } | |
1920 | } | |
1921 | #endif | |
1922 | ||
1da177e4 LT |
1923 | if (pol->action == XFRM_POLICY_ALLOW) { |
1924 | struct sec_path *sp; | |
1925 | static struct sec_path dummy; | |
4e81bb83 | 1926 | struct xfrm_tmpl *tp[XFRM_MAX_DEPTH]; |
41a49cc3 | 1927 | struct xfrm_tmpl *stp[XFRM_MAX_DEPTH]; |
4e81bb83 MN |
1928 | struct xfrm_tmpl **tpp = tp; |
1929 | int ti = 0; | |
1da177e4 LT |
1930 | int i, k; |
1931 | ||
1932 | if ((sp = skb->sp) == NULL) | |
1933 | sp = &dummy; | |
1934 | ||
4e81bb83 MN |
1935 | for (pi = 0; pi < npols; pi++) { |
1936 | if (pols[pi] != pol && | |
0aa64774 MN |
1937 | pols[pi]->action != XFRM_POLICY_ALLOW) { |
1938 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLBLOCK); | |
4e81bb83 | 1939 | goto reject; |
0aa64774 MN |
1940 | } |
1941 | if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
1942 | XFRM_INC_STATS(LINUX_MIB_XFRMINBUFFERERROR); | |
4e81bb83 | 1943 | goto reject_error; |
0aa64774 | 1944 | } |
4e81bb83 MN |
1945 | for (i = 0; i < pols[pi]->xfrm_nr; i++) |
1946 | tpp[ti++] = &pols[pi]->xfrm_vec[i]; | |
1947 | } | |
1948 | xfrm_nr = ti; | |
41a49cc3 MN |
1949 | if (npols > 1) { |
1950 | xfrm_tmpl_sort(stp, tpp, xfrm_nr, family); | |
1951 | tpp = stp; | |
1952 | } | |
4e81bb83 | 1953 | |
1da177e4 LT |
1954 | /* For each tunnel xfrm, find the first matching tmpl. |
1955 | * For each tmpl before that, find corresponding xfrm. | |
1956 | * Order is _important_. Later we will implement | |
1957 | * some barriers, but at the moment barriers | |
1958 | * are implied between each two transformations. | |
1959 | */ | |
4e81bb83 MN |
1960 | for (i = xfrm_nr-1, k = 0; i >= 0; i--) { |
1961 | k = xfrm_policy_ok(tpp[i], sp, k, family); | |
df0ba92a | 1962 | if (k < 0) { |
d1d9facf JM |
1963 | if (k < -1) |
1964 | /* "-2 - errored_index" returned */ | |
1965 | xerr_idx = -(2+k); | |
0aa64774 | 1966 | XFRM_INC_STATS(LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 1967 | goto reject; |
df0ba92a | 1968 | } |
1da177e4 LT |
1969 | } |
1970 | ||
0aa64774 MN |
1971 | if (secpath_has_nontransport(sp, k, &xerr_idx)) { |
1972 | XFRM_INC_STATS(LINUX_MIB_XFRMINTMPLMISMATCH); | |
1da177e4 | 1973 | goto reject; |
0aa64774 | 1974 | } |
1da177e4 | 1975 | |
4e81bb83 | 1976 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1977 | return 1; |
1978 | } | |
0aa64774 | 1979 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLBLOCK); |
1da177e4 LT |
1980 | |
1981 | reject: | |
df0ba92a | 1982 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
4e81bb83 MN |
1983 | reject_error: |
1984 | xfrm_pols_put(pols, npols); | |
1da177e4 LT |
1985 | return 0; |
1986 | } | |
1987 | EXPORT_SYMBOL(__xfrm_policy_check); | |
1988 | ||
1989 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
1990 | { | |
1991 | struct flowi fl; | |
1992 | ||
0aa64774 MN |
1993 | if (xfrm_decode_session(skb, &fl, family) < 0) { |
1994 | /* XXX: we should have something like FWDHDRERROR here. */ | |
1995 | XFRM_INC_STATS(LINUX_MIB_XFRMINHDRERROR); | |
1da177e4 | 1996 | return 0; |
0aa64774 | 1997 | } |
1da177e4 LT |
1998 | |
1999 | return xfrm_lookup(&skb->dst, &fl, NULL, 0) == 0; | |
2000 | } | |
2001 | EXPORT_SYMBOL(__xfrm_route_forward); | |
2002 | ||
d49c73c7 DM |
2003 | /* Optimize later using cookies and generation ids. */ |
2004 | ||
1da177e4 LT |
2005 | static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) |
2006 | { | |
d49c73c7 DM |
2007 | /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete |
2008 | * to "-1" to force all XFRM destinations to get validated by | |
2009 | * dst_ops->check on every use. We do this because when a | |
2010 | * normal route referenced by an XFRM dst is obsoleted we do | |
2011 | * not go looking around for all parent referencing XFRM dsts | |
2012 | * so that we can invalidate them. It is just too much work. | |
2013 | * Instead we make the checks here on every use. For example: | |
2014 | * | |
2015 | * XFRM dst A --> IPv4 dst X | |
2016 | * | |
2017 | * X is the "xdst->route" of A (X is also the "dst->path" of A | |
2018 | * in this example). If X is marked obsolete, "A" will not | |
2019 | * notice. That's what we are validating here via the | |
2020 | * stale_bundle() check. | |
2021 | * | |
2022 | * When a policy's bundle is pruned, we dst_free() the XFRM | |
2023 | * dst which causes it's ->obsolete field to be set to a | |
2024 | * positive non-zero integer. If an XFRM dst has been pruned | |
2025 | * like this, we want to force a new route lookup. | |
399c180a | 2026 | */ |
d49c73c7 DM |
2027 | if (dst->obsolete < 0 && !stale_bundle(dst)) |
2028 | return dst; | |
2029 | ||
1da177e4 LT |
2030 | return NULL; |
2031 | } | |
2032 | ||
2033 | static int stale_bundle(struct dst_entry *dst) | |
2034 | { | |
5b368e61 | 2035 | return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0); |
1da177e4 LT |
2036 | } |
2037 | ||
aabc9761 | 2038 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
1da177e4 | 2039 | { |
1da177e4 | 2040 | while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { |
5a3e55d6 | 2041 | dst->dev = dev->nd_net->loopback_dev; |
de3cb747 | 2042 | dev_hold(dst->dev); |
1da177e4 LT |
2043 | dev_put(dev); |
2044 | } | |
2045 | } | |
aabc9761 | 2046 | EXPORT_SYMBOL(xfrm_dst_ifdown); |
1da177e4 LT |
2047 | |
2048 | static void xfrm_link_failure(struct sk_buff *skb) | |
2049 | { | |
2050 | /* Impossible. Such dst must be popped before reaches point of failure. */ | |
2051 | return; | |
2052 | } | |
2053 | ||
2054 | static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) | |
2055 | { | |
2056 | if (dst) { | |
2057 | if (dst->obsolete) { | |
2058 | dst_release(dst); | |
2059 | dst = NULL; | |
2060 | } | |
2061 | } | |
2062 | return dst; | |
2063 | } | |
2064 | ||
2518c7c2 DM |
2065 | static void prune_one_bundle(struct xfrm_policy *pol, int (*func)(struct dst_entry *), struct dst_entry **gc_list_p) |
2066 | { | |
2067 | struct dst_entry *dst, **dstp; | |
2068 | ||
2069 | write_lock(&pol->lock); | |
2070 | dstp = &pol->bundles; | |
2071 | while ((dst=*dstp) != NULL) { | |
2072 | if (func(dst)) { | |
2073 | *dstp = dst->next; | |
2074 | dst->next = *gc_list_p; | |
2075 | *gc_list_p = dst; | |
2076 | } else { | |
2077 | dstp = &dst->next; | |
2078 | } | |
2079 | } | |
2080 | write_unlock(&pol->lock); | |
2081 | } | |
2082 | ||
1da177e4 LT |
2083 | static void xfrm_prune_bundles(int (*func)(struct dst_entry *)) |
2084 | { | |
2518c7c2 DM |
2085 | struct dst_entry *gc_list = NULL; |
2086 | int dir; | |
1da177e4 LT |
2087 | |
2088 | read_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
2089 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
2090 | struct xfrm_policy *pol; | |
2091 | struct hlist_node *entry; | |
2092 | struct hlist_head *table; | |
2093 | int i; | |
4e81bb83 | 2094 | |
2518c7c2 DM |
2095 | hlist_for_each_entry(pol, entry, |
2096 | &xfrm_policy_inexact[dir], bydst) | |
2097 | prune_one_bundle(pol, func, &gc_list); | |
2098 | ||
2099 | table = xfrm_policy_bydst[dir].table; | |
2100 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { | |
2101 | hlist_for_each_entry(pol, entry, table + i, bydst) | |
2102 | prune_one_bundle(pol, func, &gc_list); | |
1da177e4 LT |
2103 | } |
2104 | } | |
2105 | read_unlock_bh(&xfrm_policy_lock); | |
2106 | ||
2107 | while (gc_list) { | |
2518c7c2 | 2108 | struct dst_entry *dst = gc_list; |
1da177e4 LT |
2109 | gc_list = dst->next; |
2110 | dst_free(dst); | |
2111 | } | |
2112 | } | |
2113 | ||
2114 | static int unused_bundle(struct dst_entry *dst) | |
2115 | { | |
2116 | return !atomic_read(&dst->__refcnt); | |
2117 | } | |
2118 | ||
2119 | static void __xfrm_garbage_collect(void) | |
2120 | { | |
2121 | xfrm_prune_bundles(unused_bundle); | |
2122 | } | |
2123 | ||
1c095399 | 2124 | static int xfrm_flush_bundles(void) |
1da177e4 LT |
2125 | { |
2126 | xfrm_prune_bundles(stale_bundle); | |
2127 | return 0; | |
2128 | } | |
2129 | ||
25ee3286 | 2130 | static void xfrm_init_pmtu(struct dst_entry *dst) |
1da177e4 LT |
2131 | { |
2132 | do { | |
2133 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2134 | u32 pmtu, route_mtu_cached; | |
2135 | ||
2136 | pmtu = dst_mtu(dst->child); | |
2137 | xdst->child_mtu_cached = pmtu; | |
2138 | ||
2139 | pmtu = xfrm_state_mtu(dst->xfrm, pmtu); | |
2140 | ||
2141 | route_mtu_cached = dst_mtu(xdst->route); | |
2142 | xdst->route_mtu_cached = route_mtu_cached; | |
2143 | ||
2144 | if (pmtu > route_mtu_cached) | |
2145 | pmtu = route_mtu_cached; | |
2146 | ||
2147 | dst->metrics[RTAX_MTU-1] = pmtu; | |
2148 | } while ((dst = dst->next)); | |
2149 | } | |
2150 | ||
1da177e4 LT |
2151 | /* Check that the bundle accepts the flow and its components are |
2152 | * still valid. | |
2153 | */ | |
2154 | ||
5b368e61 VY |
2155 | int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first, |
2156 | struct flowi *fl, int family, int strict) | |
1da177e4 LT |
2157 | { |
2158 | struct dst_entry *dst = &first->u.dst; | |
2159 | struct xfrm_dst *last; | |
2160 | u32 mtu; | |
2161 | ||
92d63dec | 2162 | if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || |
1da177e4 LT |
2163 | (dst->dev && !netif_running(dst->dev))) |
2164 | return 0; | |
157bfc25 MN |
2165 | #ifdef CONFIG_XFRM_SUB_POLICY |
2166 | if (fl) { | |
2167 | if (first->origin && !flow_cache_uli_match(first->origin, fl)) | |
2168 | return 0; | |
2169 | if (first->partner && | |
2170 | !xfrm_selector_match(first->partner, fl, family)) | |
2171 | return 0; | |
2172 | } | |
2173 | #endif | |
1da177e4 LT |
2174 | |
2175 | last = NULL; | |
2176 | ||
2177 | do { | |
2178 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2179 | ||
2180 | if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family)) | |
2181 | return 0; | |
67f83cbf VY |
2182 | if (fl && pol && |
2183 | !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl)) | |
e0d1caa7 | 2184 | return 0; |
1da177e4 LT |
2185 | if (dst->xfrm->km.state != XFRM_STATE_VALID) |
2186 | return 0; | |
9d4a706d DM |
2187 | if (xdst->genid != dst->xfrm->genid) |
2188 | return 0; | |
e53820de | 2189 | |
1bfcb10f | 2190 | if (strict && fl && |
13996378 | 2191 | !(dst->xfrm->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) && |
e53820de MN |
2192 | !xfrm_state_addr_flow_check(dst->xfrm, fl, family)) |
2193 | return 0; | |
1da177e4 LT |
2194 | |
2195 | mtu = dst_mtu(dst->child); | |
2196 | if (xdst->child_mtu_cached != mtu) { | |
2197 | last = xdst; | |
2198 | xdst->child_mtu_cached = mtu; | |
2199 | } | |
2200 | ||
92d63dec | 2201 | if (!dst_check(xdst->route, xdst->route_cookie)) |
1da177e4 LT |
2202 | return 0; |
2203 | mtu = dst_mtu(xdst->route); | |
2204 | if (xdst->route_mtu_cached != mtu) { | |
2205 | last = xdst; | |
2206 | xdst->route_mtu_cached = mtu; | |
2207 | } | |
2208 | ||
2209 | dst = dst->child; | |
2210 | } while (dst->xfrm); | |
2211 | ||
2212 | if (likely(!last)) | |
2213 | return 1; | |
2214 | ||
2215 | mtu = last->child_mtu_cached; | |
2216 | for (;;) { | |
2217 | dst = &last->u.dst; | |
2218 | ||
2219 | mtu = xfrm_state_mtu(dst->xfrm, mtu); | |
2220 | if (mtu > last->route_mtu_cached) | |
2221 | mtu = last->route_mtu_cached; | |
2222 | dst->metrics[RTAX_MTU-1] = mtu; | |
2223 | ||
2224 | if (last == first) | |
2225 | break; | |
2226 | ||
bd0bf076 | 2227 | last = (struct xfrm_dst *)last->u.dst.next; |
1da177e4 LT |
2228 | last->child_mtu_cached = mtu; |
2229 | } | |
2230 | ||
2231 | return 1; | |
2232 | } | |
2233 | ||
2234 | EXPORT_SYMBOL(xfrm_bundle_ok); | |
2235 | ||
1da177e4 LT |
2236 | int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) |
2237 | { | |
2238 | int err = 0; | |
2239 | if (unlikely(afinfo == NULL)) | |
2240 | return -EINVAL; | |
2241 | if (unlikely(afinfo->family >= NPROTO)) | |
2242 | return -EAFNOSUPPORT; | |
e959d812 | 2243 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2244 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) |
2245 | err = -ENOBUFS; | |
2246 | else { | |
2247 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2248 | if (likely(dst_ops->kmem_cachep == NULL)) | |
2249 | dst_ops->kmem_cachep = xfrm_dst_cache; | |
2250 | if (likely(dst_ops->check == NULL)) | |
2251 | dst_ops->check = xfrm_dst_check; | |
1da177e4 LT |
2252 | if (likely(dst_ops->negative_advice == NULL)) |
2253 | dst_ops->negative_advice = xfrm_negative_advice; | |
2254 | if (likely(dst_ops->link_failure == NULL)) | |
2255 | dst_ops->link_failure = xfrm_link_failure; | |
1da177e4 LT |
2256 | if (likely(afinfo->garbage_collect == NULL)) |
2257 | afinfo->garbage_collect = __xfrm_garbage_collect; | |
2258 | xfrm_policy_afinfo[afinfo->family] = afinfo; | |
2259 | } | |
e959d812 | 2260 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2261 | return err; |
2262 | } | |
2263 | EXPORT_SYMBOL(xfrm_policy_register_afinfo); | |
2264 | ||
2265 | int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2266 | { | |
2267 | int err = 0; | |
2268 | if (unlikely(afinfo == NULL)) | |
2269 | return -EINVAL; | |
2270 | if (unlikely(afinfo->family >= NPROTO)) | |
2271 | return -EAFNOSUPPORT; | |
e959d812 | 2272 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2273 | if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { |
2274 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) | |
2275 | err = -EINVAL; | |
2276 | else { | |
2277 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2278 | xfrm_policy_afinfo[afinfo->family] = NULL; | |
2279 | dst_ops->kmem_cachep = NULL; | |
2280 | dst_ops->check = NULL; | |
1da177e4 LT |
2281 | dst_ops->negative_advice = NULL; |
2282 | dst_ops->link_failure = NULL; | |
1da177e4 LT |
2283 | afinfo->garbage_collect = NULL; |
2284 | } | |
2285 | } | |
e959d812 | 2286 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2287 | return err; |
2288 | } | |
2289 | EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); | |
2290 | ||
2291 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) | |
2292 | { | |
2293 | struct xfrm_policy_afinfo *afinfo; | |
2294 | if (unlikely(family >= NPROTO)) | |
2295 | return NULL; | |
2296 | read_lock(&xfrm_policy_afinfo_lock); | |
2297 | afinfo = xfrm_policy_afinfo[family]; | |
546be240 HX |
2298 | if (unlikely(!afinfo)) |
2299 | read_unlock(&xfrm_policy_afinfo_lock); | |
1da177e4 LT |
2300 | return afinfo; |
2301 | } | |
2302 | ||
2303 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2304 | { | |
546be240 HX |
2305 | read_unlock(&xfrm_policy_afinfo_lock); |
2306 | } | |
2307 | ||
1da177e4 LT |
2308 | static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) |
2309 | { | |
e9dc8653 EB |
2310 | struct net_device *dev = ptr; |
2311 | ||
2312 | if (dev->nd_net != &init_net) | |
2313 | return NOTIFY_DONE; | |
2314 | ||
1da177e4 LT |
2315 | switch (event) { |
2316 | case NETDEV_DOWN: | |
2317 | xfrm_flush_bundles(); | |
2318 | } | |
2319 | return NOTIFY_DONE; | |
2320 | } | |
2321 | ||
2322 | static struct notifier_block xfrm_dev_notifier = { | |
2323 | xfrm_dev_event, | |
2324 | NULL, | |
2325 | 0 | |
2326 | }; | |
2327 | ||
558f82ef MN |
2328 | #ifdef CONFIG_XFRM_STATISTICS |
2329 | static int __init xfrm_statistics_init(void) | |
2330 | { | |
2331 | if (snmp_mib_init((void **)xfrm_statistics, | |
2332 | sizeof(struct linux_xfrm_mib)) < 0) | |
2333 | return -ENOMEM; | |
2334 | return 0; | |
2335 | } | |
2336 | #endif | |
2337 | ||
1da177e4 LT |
2338 | static void __init xfrm_policy_init(void) |
2339 | { | |
2518c7c2 DM |
2340 | unsigned int hmask, sz; |
2341 | int dir; | |
2342 | ||
1da177e4 LT |
2343 | xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", |
2344 | sizeof(struct xfrm_dst), | |
e5d679f3 | 2345 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
20c2df83 | 2346 | NULL); |
1da177e4 | 2347 | |
2518c7c2 DM |
2348 | hmask = 8 - 1; |
2349 | sz = (hmask+1) * sizeof(struct hlist_head); | |
2350 | ||
44e36b42 | 2351 | xfrm_policy_byidx = xfrm_hash_alloc(sz); |
2518c7c2 DM |
2352 | xfrm_idx_hmask = hmask; |
2353 | if (!xfrm_policy_byidx) | |
2354 | panic("XFRM: failed to allocate byidx hash\n"); | |
2355 | ||
2356 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
2357 | struct xfrm_policy_hash *htab; | |
2358 | ||
2359 | INIT_HLIST_HEAD(&xfrm_policy_inexact[dir]); | |
2360 | ||
2361 | htab = &xfrm_policy_bydst[dir]; | |
44e36b42 | 2362 | htab->table = xfrm_hash_alloc(sz); |
2518c7c2 DM |
2363 | htab->hmask = hmask; |
2364 | if (!htab->table) | |
2365 | panic("XFRM: failed to allocate bydst hash\n"); | |
2366 | } | |
2367 | ||
c4028958 | 2368 | INIT_WORK(&xfrm_policy_gc_work, xfrm_policy_gc_task); |
1da177e4 LT |
2369 | register_netdevice_notifier(&xfrm_dev_notifier); |
2370 | } | |
2371 | ||
2372 | void __init xfrm_init(void) | |
2373 | { | |
558f82ef MN |
2374 | #ifdef CONFIG_XFRM_STATISTICS |
2375 | xfrm_statistics_init(); | |
2376 | #endif | |
1da177e4 LT |
2377 | xfrm_state_init(); |
2378 | xfrm_policy_init(); | |
2379 | xfrm_input_init(); | |
558f82ef MN |
2380 | #ifdef CONFIG_XFRM_STATISTICS |
2381 | xfrm_proc_init(); | |
2382 | #endif | |
1da177e4 LT |
2383 | } |
2384 | ||
ab5f5e8b | 2385 | #ifdef CONFIG_AUDITSYSCALL |
1486cbd7 IJ |
2386 | static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp, |
2387 | struct audit_buffer *audit_buf) | |
ab5f5e8b | 2388 | { |
875179fa PM |
2389 | struct xfrm_sec_ctx *ctx = xp->security; |
2390 | struct xfrm_selector *sel = &xp->selector; | |
2391 | ||
2392 | if (ctx) | |
ab5f5e8b | 2393 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", |
875179fa | 2394 | ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); |
ab5f5e8b | 2395 | |
875179fa | 2396 | switch(sel->family) { |
ab5f5e8b | 2397 | case AF_INET: |
875179fa PM |
2398 | audit_log_format(audit_buf, " src=" NIPQUAD_FMT, |
2399 | NIPQUAD(sel->saddr.a4)); | |
2400 | if (sel->prefixlen_s != 32) | |
2401 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2402 | sel->prefixlen_s); | |
2403 | audit_log_format(audit_buf, " dst=" NIPQUAD_FMT, | |
2404 | NIPQUAD(sel->daddr.a4)); | |
2405 | if (sel->prefixlen_d != 32) | |
2406 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2407 | sel->prefixlen_d); | |
ab5f5e8b JL |
2408 | break; |
2409 | case AF_INET6: | |
875179fa PM |
2410 | audit_log_format(audit_buf, " src=" NIP6_FMT, |
2411 | NIP6(*(struct in6_addr *)sel->saddr.a6)); | |
2412 | if (sel->prefixlen_s != 128) | |
2413 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2414 | sel->prefixlen_s); | |
2415 | audit_log_format(audit_buf, " dst=" NIP6_FMT, | |
2416 | NIP6(*(struct in6_addr *)sel->daddr.a6)); | |
2417 | if (sel->prefixlen_d != 128) | |
2418 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2419 | sel->prefixlen_d); | |
ab5f5e8b JL |
2420 | break; |
2421 | } | |
2422 | } | |
2423 | ||
68277acc PM |
2424 | void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, |
2425 | u32 auid, u32 secid) | |
ab5f5e8b JL |
2426 | { |
2427 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2428 | |
afeb14b4 | 2429 | audit_buf = xfrm_audit_start("SPD-add"); |
ab5f5e8b JL |
2430 | if (audit_buf == NULL) |
2431 | return; | |
afeb14b4 PM |
2432 | xfrm_audit_helper_usrinfo(auid, secid, audit_buf); |
2433 | audit_log_format(audit_buf, " res=%u", result); | |
ab5f5e8b JL |
2434 | xfrm_audit_common_policyinfo(xp, audit_buf); |
2435 | audit_log_end(audit_buf); | |
2436 | } | |
2437 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_add); | |
2438 | ||
68277acc PM |
2439 | void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, |
2440 | u32 auid, u32 secid) | |
ab5f5e8b JL |
2441 | { |
2442 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2443 | |
afeb14b4 | 2444 | audit_buf = xfrm_audit_start("SPD-delete"); |
ab5f5e8b JL |
2445 | if (audit_buf == NULL) |
2446 | return; | |
afeb14b4 PM |
2447 | xfrm_audit_helper_usrinfo(auid, secid, audit_buf); |
2448 | audit_log_format(audit_buf, " res=%u", result); | |
ab5f5e8b JL |
2449 | xfrm_audit_common_policyinfo(xp, audit_buf); |
2450 | audit_log_end(audit_buf); | |
2451 | } | |
2452 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete); | |
2453 | #endif | |
2454 | ||
80c9abaa SS |
2455 | #ifdef CONFIG_XFRM_MIGRATE |
2456 | static int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp, | |
2457 | struct xfrm_selector *sel_tgt) | |
2458 | { | |
2459 | if (sel_cmp->proto == IPSEC_ULPROTO_ANY) { | |
2460 | if (sel_tgt->family == sel_cmp->family && | |
2461 | xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr, | |
a716c119 | 2462 | sel_cmp->family) == 0 && |
80c9abaa SS |
2463 | xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr, |
2464 | sel_cmp->family) == 0 && | |
2465 | sel_tgt->prefixlen_d == sel_cmp->prefixlen_d && | |
2466 | sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) { | |
2467 | return 1; | |
2468 | } | |
2469 | } else { | |
2470 | if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) { | |
2471 | return 1; | |
2472 | } | |
2473 | } | |
2474 | return 0; | |
2475 | } | |
2476 | ||
2477 | static struct xfrm_policy * xfrm_migrate_policy_find(struct xfrm_selector *sel, | |
2478 | u8 dir, u8 type) | |
2479 | { | |
2480 | struct xfrm_policy *pol, *ret = NULL; | |
2481 | struct hlist_node *entry; | |
2482 | struct hlist_head *chain; | |
2483 | u32 priority = ~0U; | |
2484 | ||
2485 | read_lock_bh(&xfrm_policy_lock); | |
2486 | chain = policy_hash_direct(&sel->daddr, &sel->saddr, sel->family, dir); | |
2487 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
2488 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2489 | pol->type == type) { | |
2490 | ret = pol; | |
2491 | priority = ret->priority; | |
2492 | break; | |
2493 | } | |
2494 | } | |
2495 | chain = &xfrm_policy_inexact[dir]; | |
2496 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
2497 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2498 | pol->type == type && | |
2499 | pol->priority < priority) { | |
2500 | ret = pol; | |
2501 | break; | |
2502 | } | |
2503 | } | |
2504 | ||
2505 | if (ret) | |
2506 | xfrm_pol_hold(ret); | |
2507 | ||
2508 | read_unlock_bh(&xfrm_policy_lock); | |
2509 | ||
2510 | return ret; | |
2511 | } | |
2512 | ||
2513 | static int migrate_tmpl_match(struct xfrm_migrate *m, struct xfrm_tmpl *t) | |
2514 | { | |
2515 | int match = 0; | |
2516 | ||
2517 | if (t->mode == m->mode && t->id.proto == m->proto && | |
2518 | (m->reqid == 0 || t->reqid == m->reqid)) { | |
2519 | switch (t->mode) { | |
2520 | case XFRM_MODE_TUNNEL: | |
2521 | case XFRM_MODE_BEET: | |
2522 | if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr, | |
2523 | m->old_family) == 0 && | |
2524 | xfrm_addr_cmp(&t->saddr, &m->old_saddr, | |
2525 | m->old_family) == 0) { | |
2526 | match = 1; | |
2527 | } | |
2528 | break; | |
2529 | case XFRM_MODE_TRANSPORT: | |
2530 | /* in case of transport mode, template does not store | |
2531 | any IP addresses, hence we just compare mode and | |
2532 | protocol */ | |
2533 | match = 1; | |
2534 | break; | |
2535 | default: | |
2536 | break; | |
2537 | } | |
2538 | } | |
2539 | return match; | |
2540 | } | |
2541 | ||
2542 | /* update endpoint address(es) of template(s) */ | |
2543 | static int xfrm_policy_migrate(struct xfrm_policy *pol, | |
2544 | struct xfrm_migrate *m, int num_migrate) | |
2545 | { | |
2546 | struct xfrm_migrate *mp; | |
2547 | struct dst_entry *dst; | |
2548 | int i, j, n = 0; | |
2549 | ||
2550 | write_lock_bh(&pol->lock); | |
2551 | if (unlikely(pol->dead)) { | |
2552 | /* target policy has been deleted */ | |
2553 | write_unlock_bh(&pol->lock); | |
2554 | return -ENOENT; | |
2555 | } | |
2556 | ||
2557 | for (i = 0; i < pol->xfrm_nr; i++) { | |
2558 | for (j = 0, mp = m; j < num_migrate; j++, mp++) { | |
2559 | if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i])) | |
2560 | continue; | |
2561 | n++; | |
1bfcb10f HX |
2562 | if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL && |
2563 | pol->xfrm_vec[i].mode != XFRM_MODE_BEET) | |
80c9abaa SS |
2564 | continue; |
2565 | /* update endpoints */ | |
2566 | memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr, | |
2567 | sizeof(pol->xfrm_vec[i].id.daddr)); | |
2568 | memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr, | |
2569 | sizeof(pol->xfrm_vec[i].saddr)); | |
2570 | pol->xfrm_vec[i].encap_family = mp->new_family; | |
2571 | /* flush bundles */ | |
2572 | while ((dst = pol->bundles) != NULL) { | |
2573 | pol->bundles = dst->next; | |
2574 | dst_free(dst); | |
2575 | } | |
2576 | } | |
2577 | } | |
2578 | ||
2579 | write_unlock_bh(&pol->lock); | |
2580 | ||
2581 | if (!n) | |
2582 | return -ENODATA; | |
2583 | ||
2584 | return 0; | |
2585 | } | |
2586 | ||
2587 | static int xfrm_migrate_check(struct xfrm_migrate *m, int num_migrate) | |
2588 | { | |
2589 | int i, j; | |
2590 | ||
2591 | if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) | |
2592 | return -EINVAL; | |
2593 | ||
2594 | for (i = 0; i < num_migrate; i++) { | |
2595 | if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr, | |
2596 | m[i].old_family) == 0) && | |
2597 | (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr, | |
2598 | m[i].old_family) == 0)) | |
2599 | return -EINVAL; | |
2600 | if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) || | |
2601 | xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) | |
2602 | return -EINVAL; | |
2603 | ||
2604 | /* check if there is any duplicated entry */ | |
2605 | for (j = i + 1; j < num_migrate; j++) { | |
2606 | if (!memcmp(&m[i].old_daddr, &m[j].old_daddr, | |
2607 | sizeof(m[i].old_daddr)) && | |
2608 | !memcmp(&m[i].old_saddr, &m[j].old_saddr, | |
2609 | sizeof(m[i].old_saddr)) && | |
2610 | m[i].proto == m[j].proto && | |
2611 | m[i].mode == m[j].mode && | |
2612 | m[i].reqid == m[j].reqid && | |
2613 | m[i].old_family == m[j].old_family) | |
2614 | return -EINVAL; | |
2615 | } | |
2616 | } | |
2617 | ||
2618 | return 0; | |
2619 | } | |
2620 | ||
2621 | int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type, | |
2622 | struct xfrm_migrate *m, int num_migrate) | |
2623 | { | |
2624 | int i, err, nx_cur = 0, nx_new = 0; | |
2625 | struct xfrm_policy *pol = NULL; | |
2626 | struct xfrm_state *x, *xc; | |
2627 | struct xfrm_state *x_cur[XFRM_MAX_DEPTH]; | |
2628 | struct xfrm_state *x_new[XFRM_MAX_DEPTH]; | |
2629 | struct xfrm_migrate *mp; | |
2630 | ||
2631 | if ((err = xfrm_migrate_check(m, num_migrate)) < 0) | |
2632 | goto out; | |
2633 | ||
2634 | /* Stage 1 - find policy */ | |
2635 | if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) { | |
2636 | err = -ENOENT; | |
2637 | goto out; | |
2638 | } | |
2639 | ||
2640 | /* Stage 2 - find and update state(s) */ | |
2641 | for (i = 0, mp = m; i < num_migrate; i++, mp++) { | |
2642 | if ((x = xfrm_migrate_state_find(mp))) { | |
2643 | x_cur[nx_cur] = x; | |
2644 | nx_cur++; | |
2645 | if ((xc = xfrm_state_migrate(x, mp))) { | |
2646 | x_new[nx_new] = xc; | |
2647 | nx_new++; | |
2648 | } else { | |
2649 | err = -ENODATA; | |
2650 | goto restore_state; | |
2651 | } | |
2652 | } | |
2653 | } | |
2654 | ||
2655 | /* Stage 3 - update policy */ | |
2656 | if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0) | |
2657 | goto restore_state; | |
2658 | ||
2659 | /* Stage 4 - delete old state(s) */ | |
2660 | if (nx_cur) { | |
2661 | xfrm_states_put(x_cur, nx_cur); | |
2662 | xfrm_states_delete(x_cur, nx_cur); | |
2663 | } | |
2664 | ||
2665 | /* Stage 5 - announce */ | |
2666 | km_migrate(sel, dir, type, m, num_migrate); | |
2667 | ||
2668 | xfrm_pol_put(pol); | |
2669 | ||
2670 | return 0; | |
2671 | out: | |
2672 | return err; | |
2673 | ||
2674 | restore_state: | |
2675 | if (pol) | |
2676 | xfrm_pol_put(pol); | |
2677 | if (nx_cur) | |
2678 | xfrm_states_put(x_cur, nx_cur); | |
2679 | if (nx_new) | |
2680 | xfrm_states_delete(x_new, nx_new); | |
2681 | ||
2682 | return err; | |
2683 | } | |
e610e679 | 2684 | EXPORT_SYMBOL(xfrm_migrate); |
80c9abaa | 2685 | #endif |