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Commit | Line | Data |
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1 | /* | |
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 | |
13 | * | |
14 | */ | |
15 | ||
16 | #include <linux/err.h> | |
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> | |
24 | #include <linux/netfilter.h> | |
25 | #include <linux/module.h> | |
26 | #include <linux/cache.h> | |
27 | #include <linux/audit.h> | |
28 | #include <net/dst.h> | |
29 | #include <net/xfrm.h> | |
30 | #include <net/ip.h> | |
31 | #ifdef CONFIG_XFRM_STATISTICS | |
32 | #include <net/snmp.h> | |
33 | #endif | |
34 | ||
35 | #include "xfrm_hash.h" | |
36 | ||
37 | DEFINE_MUTEX(xfrm_cfg_mutex); | |
38 | EXPORT_SYMBOL(xfrm_cfg_mutex); | |
39 | ||
40 | static DEFINE_SPINLOCK(xfrm_policy_sk_bundle_lock); | |
41 | static struct dst_entry *xfrm_policy_sk_bundles; | |
42 | static DEFINE_RWLOCK(xfrm_policy_lock); | |
43 | ||
44 | static DEFINE_RWLOCK(xfrm_policy_afinfo_lock); | |
45 | static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO]; | |
46 | ||
47 | static struct kmem_cache *xfrm_dst_cache __read_mostly; | |
48 | ||
49 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family); | |
50 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo); | |
51 | static void xfrm_init_pmtu(struct dst_entry *dst); | |
52 | static int stale_bundle(struct dst_entry *dst); | |
53 | static int xfrm_bundle_ok(struct xfrm_dst *xdst); | |
54 | ||
55 | ||
56 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, | |
57 | int dir); | |
58 | ||
59 | static inline int | |
60 | __xfrm4_selector_match(const struct xfrm_selector *sel, const struct flowi *fl) | |
61 | { | |
62 | const struct flowi4 *fl4 = &fl->u.ip4; | |
63 | ||
64 | return addr4_match(fl4->daddr, sel->daddr.a4, sel->prefixlen_d) && | |
65 | addr4_match(fl4->saddr, sel->saddr.a4, sel->prefixlen_s) && | |
66 | !((xfrm_flowi_dport(fl, &fl4->uli) ^ sel->dport) & sel->dport_mask) && | |
67 | !((xfrm_flowi_sport(fl, &fl4->uli) ^ sel->sport) & sel->sport_mask) && | |
68 | (fl4->flowi4_proto == sel->proto || !sel->proto) && | |
69 | (fl4->flowi4_oif == sel->ifindex || !sel->ifindex); | |
70 | } | |
71 | ||
72 | static inline int | |
73 | __xfrm6_selector_match(const struct xfrm_selector *sel, const struct flowi *fl) | |
74 | { | |
75 | const struct flowi6 *fl6 = &fl->u.ip6; | |
76 | ||
77 | return addr_match(&fl6->daddr, &sel->daddr, sel->prefixlen_d) && | |
78 | addr_match(&fl6->saddr, &sel->saddr, sel->prefixlen_s) && | |
79 | !((xfrm_flowi_dport(fl, &fl6->uli) ^ sel->dport) & sel->dport_mask) && | |
80 | !((xfrm_flowi_sport(fl, &fl6->uli) ^ sel->sport) & sel->sport_mask) && | |
81 | (fl6->flowi6_proto == sel->proto || !sel->proto) && | |
82 | (fl6->flowi6_oif == sel->ifindex || !sel->ifindex); | |
83 | } | |
84 | ||
85 | int xfrm_selector_match(const struct xfrm_selector *sel, const struct flowi *fl, | |
86 | unsigned short family) | |
87 | { | |
88 | switch (family) { | |
89 | case AF_INET: | |
90 | return __xfrm4_selector_match(sel, fl); | |
91 | case AF_INET6: | |
92 | return __xfrm6_selector_match(sel, fl); | |
93 | } | |
94 | return 0; | |
95 | } | |
96 | ||
97 | static inline struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, | |
98 | const xfrm_address_t *saddr, | |
99 | const xfrm_address_t *daddr, | |
100 | int family) | |
101 | { | |
102 | struct xfrm_policy_afinfo *afinfo; | |
103 | struct dst_entry *dst; | |
104 | ||
105 | afinfo = xfrm_policy_get_afinfo(family); | |
106 | if (unlikely(afinfo == NULL)) | |
107 | return ERR_PTR(-EAFNOSUPPORT); | |
108 | ||
109 | dst = afinfo->dst_lookup(net, tos, saddr, daddr); | |
110 | ||
111 | xfrm_policy_put_afinfo(afinfo); | |
112 | ||
113 | return dst; | |
114 | } | |
115 | ||
116 | static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos, | |
117 | xfrm_address_t *prev_saddr, | |
118 | xfrm_address_t *prev_daddr, | |
119 | int family) | |
120 | { | |
121 | struct net *net = xs_net(x); | |
122 | xfrm_address_t *saddr = &x->props.saddr; | |
123 | xfrm_address_t *daddr = &x->id.daddr; | |
124 | struct dst_entry *dst; | |
125 | ||
126 | if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) { | |
127 | saddr = x->coaddr; | |
128 | daddr = prev_daddr; | |
129 | } | |
130 | if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) { | |
131 | saddr = prev_saddr; | |
132 | daddr = x->coaddr; | |
133 | } | |
134 | ||
135 | dst = __xfrm_dst_lookup(net, tos, saddr, daddr, family); | |
136 | ||
137 | if (!IS_ERR(dst)) { | |
138 | if (prev_saddr != saddr) | |
139 | memcpy(prev_saddr, saddr, sizeof(*prev_saddr)); | |
140 | if (prev_daddr != daddr) | |
141 | memcpy(prev_daddr, daddr, sizeof(*prev_daddr)); | |
142 | } | |
143 | ||
144 | return dst; | |
145 | } | |
146 | ||
147 | static inline unsigned long make_jiffies(long secs) | |
148 | { | |
149 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
150 | return MAX_SCHEDULE_TIMEOUT-1; | |
151 | else | |
152 | return secs*HZ; | |
153 | } | |
154 | ||
155 | static void xfrm_policy_timer(unsigned long data) | |
156 | { | |
157 | struct xfrm_policy *xp = (struct xfrm_policy*)data; | |
158 | unsigned long now = get_seconds(); | |
159 | long next = LONG_MAX; | |
160 | int warn = 0; | |
161 | int dir; | |
162 | ||
163 | read_lock(&xp->lock); | |
164 | ||
165 | if (unlikely(xp->walk.dead)) | |
166 | goto out; | |
167 | ||
168 | dir = xfrm_policy_id2dir(xp->index); | |
169 | ||
170 | if (xp->lft.hard_add_expires_seconds) { | |
171 | long tmo = xp->lft.hard_add_expires_seconds + | |
172 | xp->curlft.add_time - now; | |
173 | if (tmo <= 0) | |
174 | goto expired; | |
175 | if (tmo < next) | |
176 | next = tmo; | |
177 | } | |
178 | if (xp->lft.hard_use_expires_seconds) { | |
179 | long tmo = xp->lft.hard_use_expires_seconds + | |
180 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
181 | if (tmo <= 0) | |
182 | goto expired; | |
183 | if (tmo < next) | |
184 | next = tmo; | |
185 | } | |
186 | if (xp->lft.soft_add_expires_seconds) { | |
187 | long tmo = xp->lft.soft_add_expires_seconds + | |
188 | xp->curlft.add_time - now; | |
189 | if (tmo <= 0) { | |
190 | warn = 1; | |
191 | tmo = XFRM_KM_TIMEOUT; | |
192 | } | |
193 | if (tmo < next) | |
194 | next = tmo; | |
195 | } | |
196 | if (xp->lft.soft_use_expires_seconds) { | |
197 | long tmo = xp->lft.soft_use_expires_seconds + | |
198 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
199 | if (tmo <= 0) { | |
200 | warn = 1; | |
201 | tmo = XFRM_KM_TIMEOUT; | |
202 | } | |
203 | if (tmo < next) | |
204 | next = tmo; | |
205 | } | |
206 | ||
207 | if (warn) | |
208 | km_policy_expired(xp, dir, 0, 0); | |
209 | if (next != LONG_MAX && | |
210 | !mod_timer(&xp->timer, jiffies + make_jiffies(next))) | |
211 | xfrm_pol_hold(xp); | |
212 | ||
213 | out: | |
214 | read_unlock(&xp->lock); | |
215 | xfrm_pol_put(xp); | |
216 | return; | |
217 | ||
218 | expired: | |
219 | read_unlock(&xp->lock); | |
220 | if (!xfrm_policy_delete(xp, dir)) | |
221 | km_policy_expired(xp, dir, 1, 0); | |
222 | xfrm_pol_put(xp); | |
223 | } | |
224 | ||
225 | static struct flow_cache_object *xfrm_policy_flo_get(struct flow_cache_object *flo) | |
226 | { | |
227 | struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo); | |
228 | ||
229 | if (unlikely(pol->walk.dead)) | |
230 | flo = NULL; | |
231 | else | |
232 | xfrm_pol_hold(pol); | |
233 | ||
234 | return flo; | |
235 | } | |
236 | ||
237 | static int xfrm_policy_flo_check(struct flow_cache_object *flo) | |
238 | { | |
239 | struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo); | |
240 | ||
241 | return !pol->walk.dead; | |
242 | } | |
243 | ||
244 | static void xfrm_policy_flo_delete(struct flow_cache_object *flo) | |
245 | { | |
246 | xfrm_pol_put(container_of(flo, struct xfrm_policy, flo)); | |
247 | } | |
248 | ||
249 | static const struct flow_cache_ops xfrm_policy_fc_ops = { | |
250 | .get = xfrm_policy_flo_get, | |
251 | .check = xfrm_policy_flo_check, | |
252 | .delete = xfrm_policy_flo_delete, | |
253 | }; | |
254 | ||
255 | /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2 | |
256 | * SPD calls. | |
257 | */ | |
258 | ||
259 | struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp) | |
260 | { | |
261 | struct xfrm_policy *policy; | |
262 | ||
263 | policy = kzalloc(sizeof(struct xfrm_policy), gfp); | |
264 | ||
265 | if (policy) { | |
266 | write_pnet(&policy->xp_net, net); | |
267 | INIT_LIST_HEAD(&policy->walk.all); | |
268 | INIT_HLIST_NODE(&policy->bydst); | |
269 | INIT_HLIST_NODE(&policy->byidx); | |
270 | rwlock_init(&policy->lock); | |
271 | atomic_set(&policy->refcnt, 1); | |
272 | setup_timer(&policy->timer, xfrm_policy_timer, | |
273 | (unsigned long)policy); | |
274 | policy->flo.ops = &xfrm_policy_fc_ops; | |
275 | } | |
276 | return policy; | |
277 | } | |
278 | EXPORT_SYMBOL(xfrm_policy_alloc); | |
279 | ||
280 | /* Destroy xfrm_policy: descendant resources must be released to this moment. */ | |
281 | ||
282 | void xfrm_policy_destroy(struct xfrm_policy *policy) | |
283 | { | |
284 | BUG_ON(!policy->walk.dead); | |
285 | ||
286 | if (del_timer(&policy->timer)) | |
287 | BUG(); | |
288 | ||
289 | security_xfrm_policy_free(policy->security); | |
290 | kfree(policy); | |
291 | } | |
292 | EXPORT_SYMBOL(xfrm_policy_destroy); | |
293 | ||
294 | /* Rule must be locked. Release descentant resources, announce | |
295 | * entry dead. The rule must be unlinked from lists to the moment. | |
296 | */ | |
297 | ||
298 | static void xfrm_policy_kill(struct xfrm_policy *policy) | |
299 | { | |
300 | policy->walk.dead = 1; | |
301 | ||
302 | atomic_inc(&policy->genid); | |
303 | ||
304 | if (del_timer(&policy->timer)) | |
305 | xfrm_pol_put(policy); | |
306 | ||
307 | xfrm_pol_put(policy); | |
308 | } | |
309 | ||
310 | static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024; | |
311 | ||
312 | static inline unsigned int idx_hash(struct net *net, u32 index) | |
313 | { | |
314 | return __idx_hash(index, net->xfrm.policy_idx_hmask); | |
315 | } | |
316 | ||
317 | static struct hlist_head *policy_hash_bysel(struct net *net, | |
318 | const struct xfrm_selector *sel, | |
319 | unsigned short family, int dir) | |
320 | { | |
321 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; | |
322 | unsigned int hash = __sel_hash(sel, family, hmask); | |
323 | ||
324 | return (hash == hmask + 1 ? | |
325 | &net->xfrm.policy_inexact[dir] : | |
326 | net->xfrm.policy_bydst[dir].table + hash); | |
327 | } | |
328 | ||
329 | static struct hlist_head *policy_hash_direct(struct net *net, | |
330 | const xfrm_address_t *daddr, | |
331 | const xfrm_address_t *saddr, | |
332 | unsigned short family, int dir) | |
333 | { | |
334 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; | |
335 | unsigned int hash = __addr_hash(daddr, saddr, family, hmask); | |
336 | ||
337 | return net->xfrm.policy_bydst[dir].table + hash; | |
338 | } | |
339 | ||
340 | static void xfrm_dst_hash_transfer(struct hlist_head *list, | |
341 | struct hlist_head *ndsttable, | |
342 | unsigned int nhashmask) | |
343 | { | |
344 | struct hlist_node *entry, *tmp, *entry0 = NULL; | |
345 | struct xfrm_policy *pol; | |
346 | unsigned int h0 = 0; | |
347 | ||
348 | redo: | |
349 | hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) { | |
350 | unsigned int h; | |
351 | ||
352 | h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr, | |
353 | pol->family, nhashmask); | |
354 | if (!entry0) { | |
355 | hlist_del(entry); | |
356 | hlist_add_head(&pol->bydst, ndsttable+h); | |
357 | h0 = h; | |
358 | } else { | |
359 | if (h != h0) | |
360 | continue; | |
361 | hlist_del(entry); | |
362 | hlist_add_after(entry0, &pol->bydst); | |
363 | } | |
364 | entry0 = entry; | |
365 | } | |
366 | if (!hlist_empty(list)) { | |
367 | entry0 = NULL; | |
368 | goto redo; | |
369 | } | |
370 | } | |
371 | ||
372 | static void xfrm_idx_hash_transfer(struct hlist_head *list, | |
373 | struct hlist_head *nidxtable, | |
374 | unsigned int nhashmask) | |
375 | { | |
376 | struct hlist_node *entry, *tmp; | |
377 | struct xfrm_policy *pol; | |
378 | ||
379 | hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) { | |
380 | unsigned int h; | |
381 | ||
382 | h = __idx_hash(pol->index, nhashmask); | |
383 | hlist_add_head(&pol->byidx, nidxtable+h); | |
384 | } | |
385 | } | |
386 | ||
387 | static unsigned long xfrm_new_hash_mask(unsigned int old_hmask) | |
388 | { | |
389 | return ((old_hmask + 1) << 1) - 1; | |
390 | } | |
391 | ||
392 | static void xfrm_bydst_resize(struct net *net, int dir) | |
393 | { | |
394 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; | |
395 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); | |
396 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
397 | struct hlist_head *odst = net->xfrm.policy_bydst[dir].table; | |
398 | struct hlist_head *ndst = xfrm_hash_alloc(nsize); | |
399 | int i; | |
400 | ||
401 | if (!ndst) | |
402 | return; | |
403 | ||
404 | write_lock_bh(&xfrm_policy_lock); | |
405 | ||
406 | for (i = hmask; i >= 0; i--) | |
407 | xfrm_dst_hash_transfer(odst + i, ndst, nhashmask); | |
408 | ||
409 | net->xfrm.policy_bydst[dir].table = ndst; | |
410 | net->xfrm.policy_bydst[dir].hmask = nhashmask; | |
411 | ||
412 | write_unlock_bh(&xfrm_policy_lock); | |
413 | ||
414 | xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head)); | |
415 | } | |
416 | ||
417 | static void xfrm_byidx_resize(struct net *net, int total) | |
418 | { | |
419 | unsigned int hmask = net->xfrm.policy_idx_hmask; | |
420 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); | |
421 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
422 | struct hlist_head *oidx = net->xfrm.policy_byidx; | |
423 | struct hlist_head *nidx = xfrm_hash_alloc(nsize); | |
424 | int i; | |
425 | ||
426 | if (!nidx) | |
427 | return; | |
428 | ||
429 | write_lock_bh(&xfrm_policy_lock); | |
430 | ||
431 | for (i = hmask; i >= 0; i--) | |
432 | xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask); | |
433 | ||
434 | net->xfrm.policy_byidx = nidx; | |
435 | net->xfrm.policy_idx_hmask = nhashmask; | |
436 | ||
437 | write_unlock_bh(&xfrm_policy_lock); | |
438 | ||
439 | xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head)); | |
440 | } | |
441 | ||
442 | static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total) | |
443 | { | |
444 | unsigned int cnt = net->xfrm.policy_count[dir]; | |
445 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; | |
446 | ||
447 | if (total) | |
448 | *total += cnt; | |
449 | ||
450 | if ((hmask + 1) < xfrm_policy_hashmax && | |
451 | cnt > hmask) | |
452 | return 1; | |
453 | ||
454 | return 0; | |
455 | } | |
456 | ||
457 | static inline int xfrm_byidx_should_resize(struct net *net, int total) | |
458 | { | |
459 | unsigned int hmask = net->xfrm.policy_idx_hmask; | |
460 | ||
461 | if ((hmask + 1) < xfrm_policy_hashmax && | |
462 | total > hmask) | |
463 | return 1; | |
464 | ||
465 | return 0; | |
466 | } | |
467 | ||
468 | void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si) | |
469 | { | |
470 | read_lock_bh(&xfrm_policy_lock); | |
471 | si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN]; | |
472 | si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT]; | |
473 | si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD]; | |
474 | si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX]; | |
475 | si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX]; | |
476 | si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX]; | |
477 | si->spdhcnt = net->xfrm.policy_idx_hmask; | |
478 | si->spdhmcnt = xfrm_policy_hashmax; | |
479 | read_unlock_bh(&xfrm_policy_lock); | |
480 | } | |
481 | EXPORT_SYMBOL(xfrm_spd_getinfo); | |
482 | ||
483 | static DEFINE_MUTEX(hash_resize_mutex); | |
484 | static void xfrm_hash_resize(struct work_struct *work) | |
485 | { | |
486 | struct net *net = container_of(work, struct net, xfrm.policy_hash_work); | |
487 | int dir, total; | |
488 | ||
489 | mutex_lock(&hash_resize_mutex); | |
490 | ||
491 | total = 0; | |
492 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
493 | if (xfrm_bydst_should_resize(net, dir, &total)) | |
494 | xfrm_bydst_resize(net, dir); | |
495 | } | |
496 | if (xfrm_byidx_should_resize(net, total)) | |
497 | xfrm_byidx_resize(net, total); | |
498 | ||
499 | mutex_unlock(&hash_resize_mutex); | |
500 | } | |
501 | ||
502 | /* Generate new index... KAME seems to generate them ordered by cost | |
503 | * of an absolute inpredictability of ordering of rules. This will not pass. */ | |
504 | static u32 xfrm_gen_index(struct net *net, int dir) | |
505 | { | |
506 | static u32 idx_generator; | |
507 | ||
508 | for (;;) { | |
509 | struct hlist_node *entry; | |
510 | struct hlist_head *list; | |
511 | struct xfrm_policy *p; | |
512 | u32 idx; | |
513 | int found; | |
514 | ||
515 | idx = (idx_generator | dir); | |
516 | idx_generator += 8; | |
517 | if (idx == 0) | |
518 | idx = 8; | |
519 | list = net->xfrm.policy_byidx + idx_hash(net, idx); | |
520 | found = 0; | |
521 | hlist_for_each_entry(p, entry, list, byidx) { | |
522 | if (p->index == idx) { | |
523 | found = 1; | |
524 | break; | |
525 | } | |
526 | } | |
527 | if (!found) | |
528 | return idx; | |
529 | } | |
530 | } | |
531 | ||
532 | static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2) | |
533 | { | |
534 | u32 *p1 = (u32 *) s1; | |
535 | u32 *p2 = (u32 *) s2; | |
536 | int len = sizeof(struct xfrm_selector) / sizeof(u32); | |
537 | int i; | |
538 | ||
539 | for (i = 0; i < len; i++) { | |
540 | if (p1[i] != p2[i]) | |
541 | return 1; | |
542 | } | |
543 | ||
544 | return 0; | |
545 | } | |
546 | ||
547 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) | |
548 | { | |
549 | struct net *net = xp_net(policy); | |
550 | struct xfrm_policy *pol; | |
551 | struct xfrm_policy *delpol; | |
552 | struct hlist_head *chain; | |
553 | struct hlist_node *entry, *newpos; | |
554 | u32 mark = policy->mark.v & policy->mark.m; | |
555 | ||
556 | write_lock_bh(&xfrm_policy_lock); | |
557 | chain = policy_hash_bysel(net, &policy->selector, policy->family, dir); | |
558 | delpol = NULL; | |
559 | newpos = NULL; | |
560 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
561 | if (pol->type == policy->type && | |
562 | !selector_cmp(&pol->selector, &policy->selector) && | |
563 | (mark & pol->mark.m) == pol->mark.v && | |
564 | xfrm_sec_ctx_match(pol->security, policy->security) && | |
565 | !WARN_ON(delpol)) { | |
566 | if (excl) { | |
567 | write_unlock_bh(&xfrm_policy_lock); | |
568 | return -EEXIST; | |
569 | } | |
570 | delpol = pol; | |
571 | if (policy->priority > pol->priority) | |
572 | continue; | |
573 | } else if (policy->priority >= pol->priority) { | |
574 | newpos = &pol->bydst; | |
575 | continue; | |
576 | } | |
577 | if (delpol) | |
578 | break; | |
579 | } | |
580 | if (newpos) | |
581 | hlist_add_after(newpos, &policy->bydst); | |
582 | else | |
583 | hlist_add_head(&policy->bydst, chain); | |
584 | xfrm_pol_hold(policy); | |
585 | net->xfrm.policy_count[dir]++; | |
586 | atomic_inc(&flow_cache_genid); | |
587 | if (delpol) | |
588 | __xfrm_policy_unlink(delpol, dir); | |
589 | policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir); | |
590 | hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index)); | |
591 | policy->curlft.add_time = get_seconds(); | |
592 | policy->curlft.use_time = 0; | |
593 | if (!mod_timer(&policy->timer, jiffies + HZ)) | |
594 | xfrm_pol_hold(policy); | |
595 | list_add(&policy->walk.all, &net->xfrm.policy_all); | |
596 | write_unlock_bh(&xfrm_policy_lock); | |
597 | ||
598 | if (delpol) | |
599 | xfrm_policy_kill(delpol); | |
600 | else if (xfrm_bydst_should_resize(net, dir, NULL)) | |
601 | schedule_work(&net->xfrm.policy_hash_work); | |
602 | ||
603 | return 0; | |
604 | } | |
605 | EXPORT_SYMBOL(xfrm_policy_insert); | |
606 | ||
607 | struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type, | |
608 | int dir, struct xfrm_selector *sel, | |
609 | struct xfrm_sec_ctx *ctx, int delete, | |
610 | int *err) | |
611 | { | |
612 | struct xfrm_policy *pol, *ret; | |
613 | struct hlist_head *chain; | |
614 | struct hlist_node *entry; | |
615 | ||
616 | *err = 0; | |
617 | write_lock_bh(&xfrm_policy_lock); | |
618 | chain = policy_hash_bysel(net, sel, sel->family, dir); | |
619 | ret = NULL; | |
620 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
621 | if (pol->type == type && | |
622 | (mark & pol->mark.m) == pol->mark.v && | |
623 | !selector_cmp(sel, &pol->selector) && | |
624 | xfrm_sec_ctx_match(ctx, pol->security)) { | |
625 | xfrm_pol_hold(pol); | |
626 | if (delete) { | |
627 | *err = security_xfrm_policy_delete( | |
628 | pol->security); | |
629 | if (*err) { | |
630 | write_unlock_bh(&xfrm_policy_lock); | |
631 | return pol; | |
632 | } | |
633 | __xfrm_policy_unlink(pol, dir); | |
634 | } | |
635 | ret = pol; | |
636 | break; | |
637 | } | |
638 | } | |
639 | write_unlock_bh(&xfrm_policy_lock); | |
640 | ||
641 | if (ret && delete) | |
642 | xfrm_policy_kill(ret); | |
643 | return ret; | |
644 | } | |
645 | EXPORT_SYMBOL(xfrm_policy_bysel_ctx); | |
646 | ||
647 | struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type, | |
648 | int dir, u32 id, int delete, int *err) | |
649 | { | |
650 | struct xfrm_policy *pol, *ret; | |
651 | struct hlist_head *chain; | |
652 | struct hlist_node *entry; | |
653 | ||
654 | *err = -ENOENT; | |
655 | if (xfrm_policy_id2dir(id) != dir) | |
656 | return NULL; | |
657 | ||
658 | *err = 0; | |
659 | write_lock_bh(&xfrm_policy_lock); | |
660 | chain = net->xfrm.policy_byidx + idx_hash(net, id); | |
661 | ret = NULL; | |
662 | hlist_for_each_entry(pol, entry, chain, byidx) { | |
663 | if (pol->type == type && pol->index == id && | |
664 | (mark & pol->mark.m) == pol->mark.v) { | |
665 | xfrm_pol_hold(pol); | |
666 | if (delete) { | |
667 | *err = security_xfrm_policy_delete( | |
668 | pol->security); | |
669 | if (*err) { | |
670 | write_unlock_bh(&xfrm_policy_lock); | |
671 | return pol; | |
672 | } | |
673 | __xfrm_policy_unlink(pol, dir); | |
674 | } | |
675 | ret = pol; | |
676 | break; | |
677 | } | |
678 | } | |
679 | write_unlock_bh(&xfrm_policy_lock); | |
680 | ||
681 | if (ret && delete) | |
682 | xfrm_policy_kill(ret); | |
683 | return ret; | |
684 | } | |
685 | EXPORT_SYMBOL(xfrm_policy_byid); | |
686 | ||
687 | #ifdef CONFIG_SECURITY_NETWORK_XFRM | |
688 | static inline int | |
689 | xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info) | |
690 | { | |
691 | int dir, err = 0; | |
692 | ||
693 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { | |
694 | struct xfrm_policy *pol; | |
695 | struct hlist_node *entry; | |
696 | int i; | |
697 | ||
698 | hlist_for_each_entry(pol, entry, | |
699 | &net->xfrm.policy_inexact[dir], bydst) { | |
700 | if (pol->type != type) | |
701 | continue; | |
702 | err = security_xfrm_policy_delete(pol->security); | |
703 | if (err) { | |
704 | xfrm_audit_policy_delete(pol, 0, | |
705 | audit_info->loginuid, | |
706 | audit_info->sessionid, | |
707 | audit_info->secid); | |
708 | return err; | |
709 | } | |
710 | } | |
711 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { | |
712 | hlist_for_each_entry(pol, entry, | |
713 | net->xfrm.policy_bydst[dir].table + i, | |
714 | bydst) { | |
715 | if (pol->type != type) | |
716 | continue; | |
717 | err = security_xfrm_policy_delete( | |
718 | pol->security); | |
719 | if (err) { | |
720 | xfrm_audit_policy_delete(pol, 0, | |
721 | audit_info->loginuid, | |
722 | audit_info->sessionid, | |
723 | audit_info->secid); | |
724 | return err; | |
725 | } | |
726 | } | |
727 | } | |
728 | } | |
729 | return err; | |
730 | } | |
731 | #else | |
732 | static inline int | |
733 | xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info) | |
734 | { | |
735 | return 0; | |
736 | } | |
737 | #endif | |
738 | ||
739 | int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info) | |
740 | { | |
741 | int dir, err = 0, cnt = 0; | |
742 | ||
743 | write_lock_bh(&xfrm_policy_lock); | |
744 | ||
745 | err = xfrm_policy_flush_secctx_check(net, type, audit_info); | |
746 | if (err) | |
747 | goto out; | |
748 | ||
749 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { | |
750 | struct xfrm_policy *pol; | |
751 | struct hlist_node *entry; | |
752 | int i; | |
753 | ||
754 | again1: | |
755 | hlist_for_each_entry(pol, entry, | |
756 | &net->xfrm.policy_inexact[dir], bydst) { | |
757 | if (pol->type != type) | |
758 | continue; | |
759 | __xfrm_policy_unlink(pol, dir); | |
760 | write_unlock_bh(&xfrm_policy_lock); | |
761 | cnt++; | |
762 | ||
763 | xfrm_audit_policy_delete(pol, 1, audit_info->loginuid, | |
764 | audit_info->sessionid, | |
765 | audit_info->secid); | |
766 | ||
767 | xfrm_policy_kill(pol); | |
768 | ||
769 | write_lock_bh(&xfrm_policy_lock); | |
770 | goto again1; | |
771 | } | |
772 | ||
773 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { | |
774 | again2: | |
775 | hlist_for_each_entry(pol, entry, | |
776 | net->xfrm.policy_bydst[dir].table + i, | |
777 | bydst) { | |
778 | if (pol->type != type) | |
779 | continue; | |
780 | __xfrm_policy_unlink(pol, dir); | |
781 | write_unlock_bh(&xfrm_policy_lock); | |
782 | cnt++; | |
783 | ||
784 | xfrm_audit_policy_delete(pol, 1, | |
785 | audit_info->loginuid, | |
786 | audit_info->sessionid, | |
787 | audit_info->secid); | |
788 | xfrm_policy_kill(pol); | |
789 | ||
790 | write_lock_bh(&xfrm_policy_lock); | |
791 | goto again2; | |
792 | } | |
793 | } | |
794 | ||
795 | } | |
796 | if (!cnt) | |
797 | err = -ESRCH; | |
798 | out: | |
799 | write_unlock_bh(&xfrm_policy_lock); | |
800 | return err; | |
801 | } | |
802 | EXPORT_SYMBOL(xfrm_policy_flush); | |
803 | ||
804 | int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, | |
805 | int (*func)(struct xfrm_policy *, int, int, void*), | |
806 | void *data) | |
807 | { | |
808 | struct xfrm_policy *pol; | |
809 | struct xfrm_policy_walk_entry *x; | |
810 | int error = 0; | |
811 | ||
812 | if (walk->type >= XFRM_POLICY_TYPE_MAX && | |
813 | walk->type != XFRM_POLICY_TYPE_ANY) | |
814 | return -EINVAL; | |
815 | ||
816 | if (list_empty(&walk->walk.all) && walk->seq != 0) | |
817 | return 0; | |
818 | ||
819 | write_lock_bh(&xfrm_policy_lock); | |
820 | if (list_empty(&walk->walk.all)) | |
821 | x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all); | |
822 | else | |
823 | x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all); | |
824 | list_for_each_entry_from(x, &net->xfrm.policy_all, all) { | |
825 | if (x->dead) | |
826 | continue; | |
827 | pol = container_of(x, struct xfrm_policy, walk); | |
828 | if (walk->type != XFRM_POLICY_TYPE_ANY && | |
829 | walk->type != pol->type) | |
830 | continue; | |
831 | error = func(pol, xfrm_policy_id2dir(pol->index), | |
832 | walk->seq, data); | |
833 | if (error) { | |
834 | list_move_tail(&walk->walk.all, &x->all); | |
835 | goto out; | |
836 | } | |
837 | walk->seq++; | |
838 | } | |
839 | if (walk->seq == 0) { | |
840 | error = -ENOENT; | |
841 | goto out; | |
842 | } | |
843 | list_del_init(&walk->walk.all); | |
844 | out: | |
845 | write_unlock_bh(&xfrm_policy_lock); | |
846 | return error; | |
847 | } | |
848 | EXPORT_SYMBOL(xfrm_policy_walk); | |
849 | ||
850 | void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type) | |
851 | { | |
852 | INIT_LIST_HEAD(&walk->walk.all); | |
853 | walk->walk.dead = 1; | |
854 | walk->type = type; | |
855 | walk->seq = 0; | |
856 | } | |
857 | EXPORT_SYMBOL(xfrm_policy_walk_init); | |
858 | ||
859 | void xfrm_policy_walk_done(struct xfrm_policy_walk *walk) | |
860 | { | |
861 | if (list_empty(&walk->walk.all)) | |
862 | return; | |
863 | ||
864 | write_lock_bh(&xfrm_policy_lock); | |
865 | list_del(&walk->walk.all); | |
866 | write_unlock_bh(&xfrm_policy_lock); | |
867 | } | |
868 | EXPORT_SYMBOL(xfrm_policy_walk_done); | |
869 | ||
870 | /* | |
871 | * Find policy to apply to this flow. | |
872 | * | |
873 | * Returns 0 if policy found, else an -errno. | |
874 | */ | |
875 | static int xfrm_policy_match(const struct xfrm_policy *pol, | |
876 | const struct flowi *fl, | |
877 | u8 type, u16 family, int dir) | |
878 | { | |
879 | const struct xfrm_selector *sel = &pol->selector; | |
880 | int match, ret = -ESRCH; | |
881 | ||
882 | if (pol->family != family || | |
883 | (fl->flowi_mark & pol->mark.m) != pol->mark.v || | |
884 | pol->type != type) | |
885 | return ret; | |
886 | ||
887 | match = xfrm_selector_match(sel, fl, family); | |
888 | if (match) | |
889 | ret = security_xfrm_policy_lookup(pol->security, fl->flowi_secid, | |
890 | dir); | |
891 | ||
892 | return ret; | |
893 | } | |
894 | ||
895 | static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type, | |
896 | const struct flowi *fl, | |
897 | u16 family, u8 dir) | |
898 | { | |
899 | int err; | |
900 | struct xfrm_policy *pol, *ret; | |
901 | const xfrm_address_t *daddr, *saddr; | |
902 | struct hlist_node *entry; | |
903 | struct hlist_head *chain; | |
904 | u32 priority = ~0U; | |
905 | ||
906 | daddr = xfrm_flowi_daddr(fl, family); | |
907 | saddr = xfrm_flowi_saddr(fl, family); | |
908 | if (unlikely(!daddr || !saddr)) | |
909 | return NULL; | |
910 | ||
911 | read_lock_bh(&xfrm_policy_lock); | |
912 | chain = policy_hash_direct(net, daddr, saddr, family, dir); | |
913 | ret = NULL; | |
914 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
915 | err = xfrm_policy_match(pol, fl, type, family, dir); | |
916 | if (err) { | |
917 | if (err == -ESRCH) | |
918 | continue; | |
919 | else { | |
920 | ret = ERR_PTR(err); | |
921 | goto fail; | |
922 | } | |
923 | } else { | |
924 | ret = pol; | |
925 | priority = ret->priority; | |
926 | break; | |
927 | } | |
928 | } | |
929 | chain = &net->xfrm.policy_inexact[dir]; | |
930 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
931 | err = xfrm_policy_match(pol, fl, type, family, dir); | |
932 | if (err) { | |
933 | if (err == -ESRCH) | |
934 | continue; | |
935 | else { | |
936 | ret = ERR_PTR(err); | |
937 | goto fail; | |
938 | } | |
939 | } else if (pol->priority < priority) { | |
940 | ret = pol; | |
941 | break; | |
942 | } | |
943 | } | |
944 | if (ret) | |
945 | xfrm_pol_hold(ret); | |
946 | fail: | |
947 | read_unlock_bh(&xfrm_policy_lock); | |
948 | ||
949 | return ret; | |
950 | } | |
951 | ||
952 | static struct xfrm_policy * | |
953 | __xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir) | |
954 | { | |
955 | #ifdef CONFIG_XFRM_SUB_POLICY | |
956 | struct xfrm_policy *pol; | |
957 | ||
958 | pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir); | |
959 | if (pol != NULL) | |
960 | return pol; | |
961 | #endif | |
962 | return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir); | |
963 | } | |
964 | ||
965 | static struct flow_cache_object * | |
966 | xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, | |
967 | u8 dir, struct flow_cache_object *old_obj, void *ctx) | |
968 | { | |
969 | struct xfrm_policy *pol; | |
970 | ||
971 | if (old_obj) | |
972 | xfrm_pol_put(container_of(old_obj, struct xfrm_policy, flo)); | |
973 | ||
974 | pol = __xfrm_policy_lookup(net, fl, family, dir); | |
975 | if (IS_ERR_OR_NULL(pol)) | |
976 | return ERR_CAST(pol); | |
977 | ||
978 | /* Resolver returns two references: | |
979 | * one for cache and one for caller of flow_cache_lookup() */ | |
980 | xfrm_pol_hold(pol); | |
981 | ||
982 | return &pol->flo; | |
983 | } | |
984 | ||
985 | static inline int policy_to_flow_dir(int dir) | |
986 | { | |
987 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
988 | XFRM_POLICY_OUT == FLOW_DIR_OUT && | |
989 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
990 | return dir; | |
991 | switch (dir) { | |
992 | default: | |
993 | case XFRM_POLICY_IN: | |
994 | return FLOW_DIR_IN; | |
995 | case XFRM_POLICY_OUT: | |
996 | return FLOW_DIR_OUT; | |
997 | case XFRM_POLICY_FWD: | |
998 | return FLOW_DIR_FWD; | |
999 | } | |
1000 | } | |
1001 | ||
1002 | static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, | |
1003 | const struct flowi *fl) | |
1004 | { | |
1005 | struct xfrm_policy *pol; | |
1006 | ||
1007 | read_lock_bh(&xfrm_policy_lock); | |
1008 | if ((pol = sk->sk_policy[dir]) != NULL) { | |
1009 | int match = xfrm_selector_match(&pol->selector, fl, | |
1010 | sk->sk_family); | |
1011 | int err = 0; | |
1012 | ||
1013 | if (match) { | |
1014 | if ((sk->sk_mark & pol->mark.m) != pol->mark.v) { | |
1015 | pol = NULL; | |
1016 | goto out; | |
1017 | } | |
1018 | err = security_xfrm_policy_lookup(pol->security, | |
1019 | fl->flowi_secid, | |
1020 | policy_to_flow_dir(dir)); | |
1021 | if (!err) | |
1022 | xfrm_pol_hold(pol); | |
1023 | else if (err == -ESRCH) | |
1024 | pol = NULL; | |
1025 | else | |
1026 | pol = ERR_PTR(err); | |
1027 | } else | |
1028 | pol = NULL; | |
1029 | } | |
1030 | out: | |
1031 | read_unlock_bh(&xfrm_policy_lock); | |
1032 | return pol; | |
1033 | } | |
1034 | ||
1035 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) | |
1036 | { | |
1037 | struct net *net = xp_net(pol); | |
1038 | struct hlist_head *chain = policy_hash_bysel(net, &pol->selector, | |
1039 | pol->family, dir); | |
1040 | ||
1041 | list_add(&pol->walk.all, &net->xfrm.policy_all); | |
1042 | hlist_add_head(&pol->bydst, chain); | |
1043 | hlist_add_head(&pol->byidx, net->xfrm.policy_byidx+idx_hash(net, pol->index)); | |
1044 | net->xfrm.policy_count[dir]++; | |
1045 | xfrm_pol_hold(pol); | |
1046 | ||
1047 | if (xfrm_bydst_should_resize(net, dir, NULL)) | |
1048 | schedule_work(&net->xfrm.policy_hash_work); | |
1049 | } | |
1050 | ||
1051 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, | |
1052 | int dir) | |
1053 | { | |
1054 | struct net *net = xp_net(pol); | |
1055 | ||
1056 | if (hlist_unhashed(&pol->bydst)) | |
1057 | return NULL; | |
1058 | ||
1059 | hlist_del(&pol->bydst); | |
1060 | hlist_del(&pol->byidx); | |
1061 | list_del(&pol->walk.all); | |
1062 | net->xfrm.policy_count[dir]--; | |
1063 | ||
1064 | return pol; | |
1065 | } | |
1066 | ||
1067 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir) | |
1068 | { | |
1069 | write_lock_bh(&xfrm_policy_lock); | |
1070 | pol = __xfrm_policy_unlink(pol, dir); | |
1071 | write_unlock_bh(&xfrm_policy_lock); | |
1072 | if (pol) { | |
1073 | xfrm_policy_kill(pol); | |
1074 | return 0; | |
1075 | } | |
1076 | return -ENOENT; | |
1077 | } | |
1078 | EXPORT_SYMBOL(xfrm_policy_delete); | |
1079 | ||
1080 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) | |
1081 | { | |
1082 | struct net *net = xp_net(pol); | |
1083 | struct xfrm_policy *old_pol; | |
1084 | ||
1085 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1086 | if (pol && pol->type != XFRM_POLICY_TYPE_MAIN) | |
1087 | return -EINVAL; | |
1088 | #endif | |
1089 | ||
1090 | write_lock_bh(&xfrm_policy_lock); | |
1091 | old_pol = sk->sk_policy[dir]; | |
1092 | sk->sk_policy[dir] = pol; | |
1093 | if (pol) { | |
1094 | pol->curlft.add_time = get_seconds(); | |
1095 | pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir); | |
1096 | __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir); | |
1097 | } | |
1098 | if (old_pol) | |
1099 | /* Unlinking succeeds always. This is the only function | |
1100 | * allowed to delete or replace socket policy. | |
1101 | */ | |
1102 | __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir); | |
1103 | write_unlock_bh(&xfrm_policy_lock); | |
1104 | ||
1105 | if (old_pol) { | |
1106 | xfrm_policy_kill(old_pol); | |
1107 | } | |
1108 | return 0; | |
1109 | } | |
1110 | ||
1111 | static struct xfrm_policy *clone_policy(const struct xfrm_policy *old, int dir) | |
1112 | { | |
1113 | struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC); | |
1114 | ||
1115 | if (newp) { | |
1116 | newp->selector = old->selector; | |
1117 | if (security_xfrm_policy_clone(old->security, | |
1118 | &newp->security)) { | |
1119 | kfree(newp); | |
1120 | return NULL; /* ENOMEM */ | |
1121 | } | |
1122 | newp->lft = old->lft; | |
1123 | newp->curlft = old->curlft; | |
1124 | newp->mark = old->mark; | |
1125 | newp->action = old->action; | |
1126 | newp->flags = old->flags; | |
1127 | newp->xfrm_nr = old->xfrm_nr; | |
1128 | newp->index = old->index; | |
1129 | newp->type = old->type; | |
1130 | memcpy(newp->xfrm_vec, old->xfrm_vec, | |
1131 | newp->xfrm_nr*sizeof(struct xfrm_tmpl)); | |
1132 | write_lock_bh(&xfrm_policy_lock); | |
1133 | __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir); | |
1134 | write_unlock_bh(&xfrm_policy_lock); | |
1135 | xfrm_pol_put(newp); | |
1136 | } | |
1137 | return newp; | |
1138 | } | |
1139 | ||
1140 | int __xfrm_sk_clone_policy(struct sock *sk) | |
1141 | { | |
1142 | struct xfrm_policy *p0 = sk->sk_policy[0], | |
1143 | *p1 = sk->sk_policy[1]; | |
1144 | ||
1145 | sk->sk_policy[0] = sk->sk_policy[1] = NULL; | |
1146 | if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL) | |
1147 | return -ENOMEM; | |
1148 | if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL) | |
1149 | return -ENOMEM; | |
1150 | return 0; | |
1151 | } | |
1152 | ||
1153 | static int | |
1154 | xfrm_get_saddr(struct net *net, xfrm_address_t *local, xfrm_address_t *remote, | |
1155 | unsigned short family) | |
1156 | { | |
1157 | int err; | |
1158 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1159 | ||
1160 | if (unlikely(afinfo == NULL)) | |
1161 | return -EINVAL; | |
1162 | err = afinfo->get_saddr(net, local, remote); | |
1163 | xfrm_policy_put_afinfo(afinfo); | |
1164 | return err; | |
1165 | } | |
1166 | ||
1167 | /* Resolve list of templates for the flow, given policy. */ | |
1168 | ||
1169 | static int | |
1170 | xfrm_tmpl_resolve_one(struct xfrm_policy *policy, const struct flowi *fl, | |
1171 | struct xfrm_state **xfrm, unsigned short family) | |
1172 | { | |
1173 | struct net *net = xp_net(policy); | |
1174 | int nx; | |
1175 | int i, error; | |
1176 | xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); | |
1177 | xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); | |
1178 | xfrm_address_t tmp; | |
1179 | ||
1180 | for (nx=0, i = 0; i < policy->xfrm_nr; i++) { | |
1181 | struct xfrm_state *x; | |
1182 | xfrm_address_t *remote = daddr; | |
1183 | xfrm_address_t *local = saddr; | |
1184 | struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; | |
1185 | ||
1186 | if (tmpl->mode == XFRM_MODE_TUNNEL || | |
1187 | tmpl->mode == XFRM_MODE_BEET) { | |
1188 | remote = &tmpl->id.daddr; | |
1189 | local = &tmpl->saddr; | |
1190 | if (xfrm_addr_any(local, tmpl->encap_family)) { | |
1191 | error = xfrm_get_saddr(net, &tmp, remote, tmpl->encap_family); | |
1192 | if (error) | |
1193 | goto fail; | |
1194 | local = &tmp; | |
1195 | } | |
1196 | } | |
1197 | ||
1198 | x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); | |
1199 | ||
1200 | if (x && x->km.state == XFRM_STATE_VALID) { | |
1201 | xfrm[nx++] = x; | |
1202 | daddr = remote; | |
1203 | saddr = local; | |
1204 | continue; | |
1205 | } | |
1206 | if (x) { | |
1207 | error = (x->km.state == XFRM_STATE_ERROR ? | |
1208 | -EINVAL : -EAGAIN); | |
1209 | xfrm_state_put(x); | |
1210 | } | |
1211 | else if (error == -ESRCH) | |
1212 | error = -EAGAIN; | |
1213 | ||
1214 | if (!tmpl->optional) | |
1215 | goto fail; | |
1216 | } | |
1217 | return nx; | |
1218 | ||
1219 | fail: | |
1220 | for (nx--; nx>=0; nx--) | |
1221 | xfrm_state_put(xfrm[nx]); | |
1222 | return error; | |
1223 | } | |
1224 | ||
1225 | static int | |
1226 | xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, const struct flowi *fl, | |
1227 | struct xfrm_state **xfrm, unsigned short family) | |
1228 | { | |
1229 | struct xfrm_state *tp[XFRM_MAX_DEPTH]; | |
1230 | struct xfrm_state **tpp = (npols > 1) ? tp : xfrm; | |
1231 | int cnx = 0; | |
1232 | int error; | |
1233 | int ret; | |
1234 | int i; | |
1235 | ||
1236 | for (i = 0; i < npols; i++) { | |
1237 | if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
1238 | error = -ENOBUFS; | |
1239 | goto fail; | |
1240 | } | |
1241 | ||
1242 | ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family); | |
1243 | if (ret < 0) { | |
1244 | error = ret; | |
1245 | goto fail; | |
1246 | } else | |
1247 | cnx += ret; | |
1248 | } | |
1249 | ||
1250 | /* found states are sorted for outbound processing */ | |
1251 | if (npols > 1) | |
1252 | xfrm_state_sort(xfrm, tpp, cnx, family); | |
1253 | ||
1254 | return cnx; | |
1255 | ||
1256 | fail: | |
1257 | for (cnx--; cnx>=0; cnx--) | |
1258 | xfrm_state_put(tpp[cnx]); | |
1259 | return error; | |
1260 | ||
1261 | } | |
1262 | ||
1263 | /* Check that the bundle accepts the flow and its components are | |
1264 | * still valid. | |
1265 | */ | |
1266 | ||
1267 | static inline int xfrm_get_tos(const struct flowi *fl, int family) | |
1268 | { | |
1269 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1270 | int tos; | |
1271 | ||
1272 | if (!afinfo) | |
1273 | return -EINVAL; | |
1274 | ||
1275 | tos = afinfo->get_tos(fl); | |
1276 | ||
1277 | xfrm_policy_put_afinfo(afinfo); | |
1278 | ||
1279 | return tos; | |
1280 | } | |
1281 | ||
1282 | static struct flow_cache_object *xfrm_bundle_flo_get(struct flow_cache_object *flo) | |
1283 | { | |
1284 | struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); | |
1285 | struct dst_entry *dst = &xdst->u.dst; | |
1286 | ||
1287 | if (xdst->route == NULL) { | |
1288 | /* Dummy bundle - if it has xfrms we were not | |
1289 | * able to build bundle as template resolution failed. | |
1290 | * It means we need to try again resolving. */ | |
1291 | if (xdst->num_xfrms > 0) | |
1292 | return NULL; | |
1293 | } else { | |
1294 | /* Real bundle */ | |
1295 | if (stale_bundle(dst)) | |
1296 | return NULL; | |
1297 | } | |
1298 | ||
1299 | dst_hold(dst); | |
1300 | return flo; | |
1301 | } | |
1302 | ||
1303 | static int xfrm_bundle_flo_check(struct flow_cache_object *flo) | |
1304 | { | |
1305 | struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); | |
1306 | struct dst_entry *dst = &xdst->u.dst; | |
1307 | ||
1308 | if (!xdst->route) | |
1309 | return 0; | |
1310 | if (stale_bundle(dst)) | |
1311 | return 0; | |
1312 | ||
1313 | return 1; | |
1314 | } | |
1315 | ||
1316 | static void xfrm_bundle_flo_delete(struct flow_cache_object *flo) | |
1317 | { | |
1318 | struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); | |
1319 | struct dst_entry *dst = &xdst->u.dst; | |
1320 | ||
1321 | dst_free(dst); | |
1322 | } | |
1323 | ||
1324 | static const struct flow_cache_ops xfrm_bundle_fc_ops = { | |
1325 | .get = xfrm_bundle_flo_get, | |
1326 | .check = xfrm_bundle_flo_check, | |
1327 | .delete = xfrm_bundle_flo_delete, | |
1328 | }; | |
1329 | ||
1330 | static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family) | |
1331 | { | |
1332 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1333 | struct dst_ops *dst_ops; | |
1334 | struct xfrm_dst *xdst; | |
1335 | ||
1336 | if (!afinfo) | |
1337 | return ERR_PTR(-EINVAL); | |
1338 | ||
1339 | switch (family) { | |
1340 | case AF_INET: | |
1341 | dst_ops = &net->xfrm.xfrm4_dst_ops; | |
1342 | break; | |
1343 | #if IS_ENABLED(CONFIG_IPV6) | |
1344 | case AF_INET6: | |
1345 | dst_ops = &net->xfrm.xfrm6_dst_ops; | |
1346 | break; | |
1347 | #endif | |
1348 | default: | |
1349 | BUG(); | |
1350 | } | |
1351 | xdst = dst_alloc(dst_ops, NULL, 0, 0, 0); | |
1352 | ||
1353 | if (likely(xdst)) { | |
1354 | memset(&xdst->u.rt6.rt6i_table, 0, | |
1355 | sizeof(*xdst) - sizeof(struct dst_entry)); | |
1356 | xdst->flo.ops = &xfrm_bundle_fc_ops; | |
1357 | } else | |
1358 | xdst = ERR_PTR(-ENOBUFS); | |
1359 | ||
1360 | xfrm_policy_put_afinfo(afinfo); | |
1361 | ||
1362 | return xdst; | |
1363 | } | |
1364 | ||
1365 | static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst, | |
1366 | int nfheader_len) | |
1367 | { | |
1368 | struct xfrm_policy_afinfo *afinfo = | |
1369 | xfrm_policy_get_afinfo(dst->ops->family); | |
1370 | int err; | |
1371 | ||
1372 | if (!afinfo) | |
1373 | return -EINVAL; | |
1374 | ||
1375 | err = afinfo->init_path(path, dst, nfheader_len); | |
1376 | ||
1377 | xfrm_policy_put_afinfo(afinfo); | |
1378 | ||
1379 | return err; | |
1380 | } | |
1381 | ||
1382 | static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev, | |
1383 | const struct flowi *fl) | |
1384 | { | |
1385 | struct xfrm_policy_afinfo *afinfo = | |
1386 | xfrm_policy_get_afinfo(xdst->u.dst.ops->family); | |
1387 | int err; | |
1388 | ||
1389 | if (!afinfo) | |
1390 | return -EINVAL; | |
1391 | ||
1392 | err = afinfo->fill_dst(xdst, dev, fl); | |
1393 | ||
1394 | xfrm_policy_put_afinfo(afinfo); | |
1395 | ||
1396 | return err; | |
1397 | } | |
1398 | ||
1399 | ||
1400 | /* Allocate chain of dst_entry's, attach known xfrm's, calculate | |
1401 | * all the metrics... Shortly, bundle a bundle. | |
1402 | */ | |
1403 | ||
1404 | static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy, | |
1405 | struct xfrm_state **xfrm, int nx, | |
1406 | const struct flowi *fl, | |
1407 | struct dst_entry *dst) | |
1408 | { | |
1409 | struct net *net = xp_net(policy); | |
1410 | unsigned long now = jiffies; | |
1411 | struct net_device *dev; | |
1412 | struct xfrm_mode *inner_mode; | |
1413 | struct dst_entry *dst_prev = NULL; | |
1414 | struct dst_entry *dst0 = NULL; | |
1415 | int i = 0; | |
1416 | int err; | |
1417 | int header_len = 0; | |
1418 | int nfheader_len = 0; | |
1419 | int trailer_len = 0; | |
1420 | int tos; | |
1421 | int family = policy->selector.family; | |
1422 | xfrm_address_t saddr, daddr; | |
1423 | ||
1424 | xfrm_flowi_addr_get(fl, &saddr, &daddr, family); | |
1425 | ||
1426 | tos = xfrm_get_tos(fl, family); | |
1427 | err = tos; | |
1428 | if (tos < 0) | |
1429 | goto put_states; | |
1430 | ||
1431 | dst_hold(dst); | |
1432 | ||
1433 | for (; i < nx; i++) { | |
1434 | struct xfrm_dst *xdst = xfrm_alloc_dst(net, family); | |
1435 | struct dst_entry *dst1 = &xdst->u.dst; | |
1436 | ||
1437 | err = PTR_ERR(xdst); | |
1438 | if (IS_ERR(xdst)) { | |
1439 | dst_release(dst); | |
1440 | goto put_states; | |
1441 | } | |
1442 | ||
1443 | if (xfrm[i]->sel.family == AF_UNSPEC) { | |
1444 | inner_mode = xfrm_ip2inner_mode(xfrm[i], | |
1445 | xfrm_af2proto(family)); | |
1446 | if (!inner_mode) { | |
1447 | err = -EAFNOSUPPORT; | |
1448 | dst_release(dst); | |
1449 | goto put_states; | |
1450 | } | |
1451 | } else | |
1452 | inner_mode = xfrm[i]->inner_mode; | |
1453 | ||
1454 | if (!dst_prev) | |
1455 | dst0 = dst1; | |
1456 | else { | |
1457 | dst_prev->child = dst_clone(dst1); | |
1458 | dst1->flags |= DST_NOHASH; | |
1459 | } | |
1460 | ||
1461 | xdst->route = dst; | |
1462 | dst_copy_metrics(dst1, dst); | |
1463 | ||
1464 | if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) { | |
1465 | family = xfrm[i]->props.family; | |
1466 | dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr, | |
1467 | family); | |
1468 | err = PTR_ERR(dst); | |
1469 | if (IS_ERR(dst)) | |
1470 | goto put_states; | |
1471 | } else | |
1472 | dst_hold(dst); | |
1473 | ||
1474 | dst1->xfrm = xfrm[i]; | |
1475 | xdst->xfrm_genid = xfrm[i]->genid; | |
1476 | ||
1477 | dst1->obsolete = -1; | |
1478 | dst1->flags |= DST_HOST; | |
1479 | dst1->lastuse = now; | |
1480 | ||
1481 | dst1->input = dst_discard; | |
1482 | dst1->output = inner_mode->afinfo->output; | |
1483 | ||
1484 | dst1->next = dst_prev; | |
1485 | dst_prev = dst1; | |
1486 | ||
1487 | header_len += xfrm[i]->props.header_len; | |
1488 | if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT) | |
1489 | nfheader_len += xfrm[i]->props.header_len; | |
1490 | trailer_len += xfrm[i]->props.trailer_len; | |
1491 | } | |
1492 | ||
1493 | dst_prev->child = dst; | |
1494 | dst0->path = dst; | |
1495 | ||
1496 | err = -ENODEV; | |
1497 | dev = dst->dev; | |
1498 | if (!dev) | |
1499 | goto free_dst; | |
1500 | ||
1501 | /* Copy neighbour for reachability confirmation */ | |
1502 | dst_set_neighbour(dst0, neigh_clone(dst_get_neighbour_noref(dst))); | |
1503 | ||
1504 | xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len); | |
1505 | xfrm_init_pmtu(dst_prev); | |
1506 | ||
1507 | for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) { | |
1508 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev; | |
1509 | ||
1510 | err = xfrm_fill_dst(xdst, dev, fl); | |
1511 | if (err) | |
1512 | goto free_dst; | |
1513 | ||
1514 | dst_prev->header_len = header_len; | |
1515 | dst_prev->trailer_len = trailer_len; | |
1516 | header_len -= xdst->u.dst.xfrm->props.header_len; | |
1517 | trailer_len -= xdst->u.dst.xfrm->props.trailer_len; | |
1518 | } | |
1519 | ||
1520 | out: | |
1521 | return dst0; | |
1522 | ||
1523 | put_states: | |
1524 | for (; i < nx; i++) | |
1525 | xfrm_state_put(xfrm[i]); | |
1526 | free_dst: | |
1527 | if (dst0) | |
1528 | dst_free(dst0); | |
1529 | dst0 = ERR_PTR(err); | |
1530 | goto out; | |
1531 | } | |
1532 | ||
1533 | static int inline | |
1534 | xfrm_dst_alloc_copy(void **target, const void *src, int size) | |
1535 | { | |
1536 | if (!*target) { | |
1537 | *target = kmalloc(size, GFP_ATOMIC); | |
1538 | if (!*target) | |
1539 | return -ENOMEM; | |
1540 | } | |
1541 | memcpy(*target, src, size); | |
1542 | return 0; | |
1543 | } | |
1544 | ||
1545 | static int inline | |
1546 | xfrm_dst_update_parent(struct dst_entry *dst, const struct xfrm_selector *sel) | |
1547 | { | |
1548 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1549 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1550 | return xfrm_dst_alloc_copy((void **)&(xdst->partner), | |
1551 | sel, sizeof(*sel)); | |
1552 | #else | |
1553 | return 0; | |
1554 | #endif | |
1555 | } | |
1556 | ||
1557 | static int inline | |
1558 | xfrm_dst_update_origin(struct dst_entry *dst, const struct flowi *fl) | |
1559 | { | |
1560 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1561 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1562 | return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl)); | |
1563 | #else | |
1564 | return 0; | |
1565 | #endif | |
1566 | } | |
1567 | ||
1568 | static int xfrm_expand_policies(const struct flowi *fl, u16 family, | |
1569 | struct xfrm_policy **pols, | |
1570 | int *num_pols, int *num_xfrms) | |
1571 | { | |
1572 | int i; | |
1573 | ||
1574 | if (*num_pols == 0 || !pols[0]) { | |
1575 | *num_pols = 0; | |
1576 | *num_xfrms = 0; | |
1577 | return 0; | |
1578 | } | |
1579 | if (IS_ERR(pols[0])) | |
1580 | return PTR_ERR(pols[0]); | |
1581 | ||
1582 | *num_xfrms = pols[0]->xfrm_nr; | |
1583 | ||
1584 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1585 | if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW && | |
1586 | pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1587 | pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]), | |
1588 | XFRM_POLICY_TYPE_MAIN, | |
1589 | fl, family, | |
1590 | XFRM_POLICY_OUT); | |
1591 | if (pols[1]) { | |
1592 | if (IS_ERR(pols[1])) { | |
1593 | xfrm_pols_put(pols, *num_pols); | |
1594 | return PTR_ERR(pols[1]); | |
1595 | } | |
1596 | (*num_pols) ++; | |
1597 | (*num_xfrms) += pols[1]->xfrm_nr; | |
1598 | } | |
1599 | } | |
1600 | #endif | |
1601 | for (i = 0; i < *num_pols; i++) { | |
1602 | if (pols[i]->action != XFRM_POLICY_ALLOW) { | |
1603 | *num_xfrms = -1; | |
1604 | break; | |
1605 | } | |
1606 | } | |
1607 | ||
1608 | return 0; | |
1609 | ||
1610 | } | |
1611 | ||
1612 | static struct xfrm_dst * | |
1613 | xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols, | |
1614 | const struct flowi *fl, u16 family, | |
1615 | struct dst_entry *dst_orig) | |
1616 | { | |
1617 | struct net *net = xp_net(pols[0]); | |
1618 | struct xfrm_state *xfrm[XFRM_MAX_DEPTH]; | |
1619 | struct dst_entry *dst; | |
1620 | struct xfrm_dst *xdst; | |
1621 | int err; | |
1622 | ||
1623 | /* Try to instantiate a bundle */ | |
1624 | err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family); | |
1625 | if (err <= 0) { | |
1626 | if (err != 0 && err != -EAGAIN) | |
1627 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); | |
1628 | return ERR_PTR(err); | |
1629 | } | |
1630 | ||
1631 | dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig); | |
1632 | if (IS_ERR(dst)) { | |
1633 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR); | |
1634 | return ERR_CAST(dst); | |
1635 | } | |
1636 | ||
1637 | xdst = (struct xfrm_dst *)dst; | |
1638 | xdst->num_xfrms = err; | |
1639 | if (num_pols > 1) | |
1640 | err = xfrm_dst_update_parent(dst, &pols[1]->selector); | |
1641 | else | |
1642 | err = xfrm_dst_update_origin(dst, fl); | |
1643 | if (unlikely(err)) { | |
1644 | dst_free(dst); | |
1645 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR); | |
1646 | return ERR_PTR(err); | |
1647 | } | |
1648 | ||
1649 | xdst->num_pols = num_pols; | |
1650 | memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols); | |
1651 | xdst->policy_genid = atomic_read(&pols[0]->genid); | |
1652 | ||
1653 | return xdst; | |
1654 | } | |
1655 | ||
1656 | static struct flow_cache_object * | |
1657 | xfrm_bundle_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir, | |
1658 | struct flow_cache_object *oldflo, void *ctx) | |
1659 | { | |
1660 | struct dst_entry *dst_orig = (struct dst_entry *)ctx; | |
1661 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; | |
1662 | struct xfrm_dst *xdst, *new_xdst; | |
1663 | int num_pols = 0, num_xfrms = 0, i, err, pol_dead; | |
1664 | ||
1665 | /* Check if the policies from old bundle are usable */ | |
1666 | xdst = NULL; | |
1667 | if (oldflo) { | |
1668 | xdst = container_of(oldflo, struct xfrm_dst, flo); | |
1669 | num_pols = xdst->num_pols; | |
1670 | num_xfrms = xdst->num_xfrms; | |
1671 | pol_dead = 0; | |
1672 | for (i = 0; i < num_pols; i++) { | |
1673 | pols[i] = xdst->pols[i]; | |
1674 | pol_dead |= pols[i]->walk.dead; | |
1675 | } | |
1676 | if (pol_dead) { | |
1677 | dst_free(&xdst->u.dst); | |
1678 | xdst = NULL; | |
1679 | num_pols = 0; | |
1680 | num_xfrms = 0; | |
1681 | oldflo = NULL; | |
1682 | } | |
1683 | } | |
1684 | ||
1685 | /* Resolve policies to use if we couldn't get them from | |
1686 | * previous cache entry */ | |
1687 | if (xdst == NULL) { | |
1688 | num_pols = 1; | |
1689 | pols[0] = __xfrm_policy_lookup(net, fl, family, dir); | |
1690 | err = xfrm_expand_policies(fl, family, pols, | |
1691 | &num_pols, &num_xfrms); | |
1692 | if (err < 0) | |
1693 | goto inc_error; | |
1694 | if (num_pols == 0) | |
1695 | return NULL; | |
1696 | if (num_xfrms <= 0) | |
1697 | goto make_dummy_bundle; | |
1698 | } | |
1699 | ||
1700 | new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family, dst_orig); | |
1701 | if (IS_ERR(new_xdst)) { | |
1702 | err = PTR_ERR(new_xdst); | |
1703 | if (err != -EAGAIN) | |
1704 | goto error; | |
1705 | if (oldflo == NULL) | |
1706 | goto make_dummy_bundle; | |
1707 | dst_hold(&xdst->u.dst); | |
1708 | return oldflo; | |
1709 | } else if (new_xdst == NULL) { | |
1710 | num_xfrms = 0; | |
1711 | if (oldflo == NULL) | |
1712 | goto make_dummy_bundle; | |
1713 | xdst->num_xfrms = 0; | |
1714 | dst_hold(&xdst->u.dst); | |
1715 | return oldflo; | |
1716 | } | |
1717 | ||
1718 | /* Kill the previous bundle */ | |
1719 | if (xdst) { | |
1720 | /* The policies were stolen for newly generated bundle */ | |
1721 | xdst->num_pols = 0; | |
1722 | dst_free(&xdst->u.dst); | |
1723 | } | |
1724 | ||
1725 | /* Flow cache does not have reference, it dst_free()'s, | |
1726 | * but we do need to return one reference for original caller */ | |
1727 | dst_hold(&new_xdst->u.dst); | |
1728 | return &new_xdst->flo; | |
1729 | ||
1730 | make_dummy_bundle: | |
1731 | /* We found policies, but there's no bundles to instantiate: | |
1732 | * either because the policy blocks, has no transformations or | |
1733 | * we could not build template (no xfrm_states).*/ | |
1734 | xdst = xfrm_alloc_dst(net, family); | |
1735 | if (IS_ERR(xdst)) { | |
1736 | xfrm_pols_put(pols, num_pols); | |
1737 | return ERR_CAST(xdst); | |
1738 | } | |
1739 | xdst->num_pols = num_pols; | |
1740 | xdst->num_xfrms = num_xfrms; | |
1741 | memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols); | |
1742 | ||
1743 | dst_hold(&xdst->u.dst); | |
1744 | return &xdst->flo; | |
1745 | ||
1746 | inc_error: | |
1747 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); | |
1748 | error: | |
1749 | if (xdst != NULL) | |
1750 | dst_free(&xdst->u.dst); | |
1751 | else | |
1752 | xfrm_pols_put(pols, num_pols); | |
1753 | return ERR_PTR(err); | |
1754 | } | |
1755 | ||
1756 | static struct dst_entry *make_blackhole(struct net *net, u16 family, | |
1757 | struct dst_entry *dst_orig) | |
1758 | { | |
1759 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1760 | struct dst_entry *ret; | |
1761 | ||
1762 | if (!afinfo) { | |
1763 | dst_release(dst_orig); | |
1764 | ret = ERR_PTR(-EINVAL); | |
1765 | } else { | |
1766 | ret = afinfo->blackhole_route(net, dst_orig); | |
1767 | } | |
1768 | xfrm_policy_put_afinfo(afinfo); | |
1769 | ||
1770 | return ret; | |
1771 | } | |
1772 | ||
1773 | /* Main function: finds/creates a bundle for given flow. | |
1774 | * | |
1775 | * At the moment we eat a raw IP route. Mostly to speed up lookups | |
1776 | * on interfaces with disabled IPsec. | |
1777 | */ | |
1778 | struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig, | |
1779 | const struct flowi *fl, | |
1780 | struct sock *sk, int flags) | |
1781 | { | |
1782 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; | |
1783 | struct flow_cache_object *flo; | |
1784 | struct xfrm_dst *xdst; | |
1785 | struct dst_entry *dst, *route; | |
1786 | u16 family = dst_orig->ops->family; | |
1787 | u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT); | |
1788 | int i, err, num_pols, num_xfrms = 0, drop_pols = 0; | |
1789 | ||
1790 | restart: | |
1791 | dst = NULL; | |
1792 | xdst = NULL; | |
1793 | route = NULL; | |
1794 | ||
1795 | if (sk && sk->sk_policy[XFRM_POLICY_OUT]) { | |
1796 | num_pols = 1; | |
1797 | pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl); | |
1798 | err = xfrm_expand_policies(fl, family, pols, | |
1799 | &num_pols, &num_xfrms); | |
1800 | if (err < 0) | |
1801 | goto dropdst; | |
1802 | ||
1803 | if (num_pols) { | |
1804 | if (num_xfrms <= 0) { | |
1805 | drop_pols = num_pols; | |
1806 | goto no_transform; | |
1807 | } | |
1808 | ||
1809 | xdst = xfrm_resolve_and_create_bundle( | |
1810 | pols, num_pols, fl, | |
1811 | family, dst_orig); | |
1812 | if (IS_ERR(xdst)) { | |
1813 | xfrm_pols_put(pols, num_pols); | |
1814 | err = PTR_ERR(xdst); | |
1815 | goto dropdst; | |
1816 | } else if (xdst == NULL) { | |
1817 | num_xfrms = 0; | |
1818 | drop_pols = num_pols; | |
1819 | goto no_transform; | |
1820 | } | |
1821 | ||
1822 | dst_hold(&xdst->u.dst); | |
1823 | ||
1824 | spin_lock_bh(&xfrm_policy_sk_bundle_lock); | |
1825 | xdst->u.dst.next = xfrm_policy_sk_bundles; | |
1826 | xfrm_policy_sk_bundles = &xdst->u.dst; | |
1827 | spin_unlock_bh(&xfrm_policy_sk_bundle_lock); | |
1828 | ||
1829 | route = xdst->route; | |
1830 | } | |
1831 | } | |
1832 | ||
1833 | if (xdst == NULL) { | |
1834 | /* To accelerate a bit... */ | |
1835 | if ((dst_orig->flags & DST_NOXFRM) || | |
1836 | !net->xfrm.policy_count[XFRM_POLICY_OUT]) | |
1837 | goto nopol; | |
1838 | ||
1839 | flo = flow_cache_lookup(net, fl, family, dir, | |
1840 | xfrm_bundle_lookup, dst_orig); | |
1841 | if (flo == NULL) | |
1842 | goto nopol; | |
1843 | if (IS_ERR(flo)) { | |
1844 | err = PTR_ERR(flo); | |
1845 | goto dropdst; | |
1846 | } | |
1847 | xdst = container_of(flo, struct xfrm_dst, flo); | |
1848 | ||
1849 | num_pols = xdst->num_pols; | |
1850 | num_xfrms = xdst->num_xfrms; | |
1851 | memcpy(pols, xdst->pols, sizeof(struct xfrm_policy*) * num_pols); | |
1852 | route = xdst->route; | |
1853 | } | |
1854 | ||
1855 | dst = &xdst->u.dst; | |
1856 | if (route == NULL && num_xfrms > 0) { | |
1857 | /* The only case when xfrm_bundle_lookup() returns a | |
1858 | * bundle with null route, is when the template could | |
1859 | * not be resolved. It means policies are there, but | |
1860 | * bundle could not be created, since we don't yet | |
1861 | * have the xfrm_state's. We need to wait for KM to | |
1862 | * negotiate new SA's or bail out with error.*/ | |
1863 | if (net->xfrm.sysctl_larval_drop) { | |
1864 | /* EREMOTE tells the caller to generate | |
1865 | * a one-shot blackhole route. */ | |
1866 | dst_release(dst); | |
1867 | xfrm_pols_put(pols, drop_pols); | |
1868 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); | |
1869 | ||
1870 | return make_blackhole(net, family, dst_orig); | |
1871 | } | |
1872 | if (fl->flowi_flags & FLOWI_FLAG_CAN_SLEEP) { | |
1873 | DECLARE_WAITQUEUE(wait, current); | |
1874 | ||
1875 | add_wait_queue(&net->xfrm.km_waitq, &wait); | |
1876 | set_current_state(TASK_INTERRUPTIBLE); | |
1877 | schedule(); | |
1878 | set_current_state(TASK_RUNNING); | |
1879 | remove_wait_queue(&net->xfrm.km_waitq, &wait); | |
1880 | ||
1881 | if (!signal_pending(current)) { | |
1882 | dst_release(dst); | |
1883 | goto restart; | |
1884 | } | |
1885 | ||
1886 | err = -ERESTART; | |
1887 | } else | |
1888 | err = -EAGAIN; | |
1889 | ||
1890 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); | |
1891 | goto error; | |
1892 | } | |
1893 | ||
1894 | no_transform: | |
1895 | if (num_pols == 0) | |
1896 | goto nopol; | |
1897 | ||
1898 | if ((flags & XFRM_LOOKUP_ICMP) && | |
1899 | !(pols[0]->flags & XFRM_POLICY_ICMP)) { | |
1900 | err = -ENOENT; | |
1901 | goto error; | |
1902 | } | |
1903 | ||
1904 | for (i = 0; i < num_pols; i++) | |
1905 | pols[i]->curlft.use_time = get_seconds(); | |
1906 | ||
1907 | if (num_xfrms < 0) { | |
1908 | /* Prohibit the flow */ | |
1909 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK); | |
1910 | err = -EPERM; | |
1911 | goto error; | |
1912 | } else if (num_xfrms > 0) { | |
1913 | /* Flow transformed */ | |
1914 | dst_release(dst_orig); | |
1915 | } else { | |
1916 | /* Flow passes untransformed */ | |
1917 | dst_release(dst); | |
1918 | dst = dst_orig; | |
1919 | } | |
1920 | ok: | |
1921 | xfrm_pols_put(pols, drop_pols); | |
1922 | return dst; | |
1923 | ||
1924 | nopol: | |
1925 | if (!(flags & XFRM_LOOKUP_ICMP)) { | |
1926 | dst = dst_orig; | |
1927 | goto ok; | |
1928 | } | |
1929 | err = -ENOENT; | |
1930 | error: | |
1931 | dst_release(dst); | |
1932 | dropdst: | |
1933 | dst_release(dst_orig); | |
1934 | xfrm_pols_put(pols, drop_pols); | |
1935 | return ERR_PTR(err); | |
1936 | } | |
1937 | EXPORT_SYMBOL(xfrm_lookup); | |
1938 | ||
1939 | static inline int | |
1940 | xfrm_secpath_reject(int idx, struct sk_buff *skb, const struct flowi *fl) | |
1941 | { | |
1942 | struct xfrm_state *x; | |
1943 | ||
1944 | if (!skb->sp || idx < 0 || idx >= skb->sp->len) | |
1945 | return 0; | |
1946 | x = skb->sp->xvec[idx]; | |
1947 | if (!x->type->reject) | |
1948 | return 0; | |
1949 | return x->type->reject(x, skb, fl); | |
1950 | } | |
1951 | ||
1952 | /* When skb is transformed back to its "native" form, we have to | |
1953 | * check policy restrictions. At the moment we make this in maximally | |
1954 | * stupid way. Shame on me. :-) Of course, connected sockets must | |
1955 | * have policy cached at them. | |
1956 | */ | |
1957 | ||
1958 | static inline int | |
1959 | xfrm_state_ok(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, | |
1960 | unsigned short family) | |
1961 | { | |
1962 | if (xfrm_state_kern(x)) | |
1963 | return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family); | |
1964 | return x->id.proto == tmpl->id.proto && | |
1965 | (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && | |
1966 | (x->props.reqid == tmpl->reqid || !tmpl->reqid) && | |
1967 | x->props.mode == tmpl->mode && | |
1968 | (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) || | |
1969 | !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) && | |
1970 | !(x->props.mode != XFRM_MODE_TRANSPORT && | |
1971 | xfrm_state_addr_cmp(tmpl, x, family)); | |
1972 | } | |
1973 | ||
1974 | /* | |
1975 | * 0 or more than 0 is returned when validation is succeeded (either bypass | |
1976 | * because of optional transport mode, or next index of the mathced secpath | |
1977 | * state with the template. | |
1978 | * -1 is returned when no matching template is found. | |
1979 | * Otherwise "-2 - errored_index" is returned. | |
1980 | */ | |
1981 | static inline int | |
1982 | xfrm_policy_ok(const struct xfrm_tmpl *tmpl, const struct sec_path *sp, int start, | |
1983 | unsigned short family) | |
1984 | { | |
1985 | int idx = start; | |
1986 | ||
1987 | if (tmpl->optional) { | |
1988 | if (tmpl->mode == XFRM_MODE_TRANSPORT) | |
1989 | return start; | |
1990 | } else | |
1991 | start = -1; | |
1992 | for (; idx < sp->len; idx++) { | |
1993 | if (xfrm_state_ok(tmpl, sp->xvec[idx], family)) | |
1994 | return ++idx; | |
1995 | if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) { | |
1996 | if (start == -1) | |
1997 | start = -2-idx; | |
1998 | break; | |
1999 | } | |
2000 | } | |
2001 | return start; | |
2002 | } | |
2003 | ||
2004 | int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, | |
2005 | unsigned int family, int reverse) | |
2006 | { | |
2007 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
2008 | int err; | |
2009 | ||
2010 | if (unlikely(afinfo == NULL)) | |
2011 | return -EAFNOSUPPORT; | |
2012 | ||
2013 | afinfo->decode_session(skb, fl, reverse); | |
2014 | err = security_xfrm_decode_session(skb, &fl->flowi_secid); | |
2015 | xfrm_policy_put_afinfo(afinfo); | |
2016 | return err; | |
2017 | } | |
2018 | EXPORT_SYMBOL(__xfrm_decode_session); | |
2019 | ||
2020 | static inline int secpath_has_nontransport(const struct sec_path *sp, int k, int *idxp) | |
2021 | { | |
2022 | for (; k < sp->len; k++) { | |
2023 | if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) { | |
2024 | *idxp = k; | |
2025 | return 1; | |
2026 | } | |
2027 | } | |
2028 | ||
2029 | return 0; | |
2030 | } | |
2031 | ||
2032 | int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, | |
2033 | unsigned short family) | |
2034 | { | |
2035 | struct net *net = dev_net(skb->dev); | |
2036 | struct xfrm_policy *pol; | |
2037 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; | |
2038 | int npols = 0; | |
2039 | int xfrm_nr; | |
2040 | int pi; | |
2041 | int reverse; | |
2042 | struct flowi fl; | |
2043 | u8 fl_dir; | |
2044 | int xerr_idx = -1; | |
2045 | ||
2046 | reverse = dir & ~XFRM_POLICY_MASK; | |
2047 | dir &= XFRM_POLICY_MASK; | |
2048 | fl_dir = policy_to_flow_dir(dir); | |
2049 | ||
2050 | if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) { | |
2051 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); | |
2052 | return 0; | |
2053 | } | |
2054 | ||
2055 | nf_nat_decode_session(skb, &fl, family); | |
2056 | ||
2057 | /* First, check used SA against their selectors. */ | |
2058 | if (skb->sp) { | |
2059 | int i; | |
2060 | ||
2061 | for (i=skb->sp->len-1; i>=0; i--) { | |
2062 | struct xfrm_state *x = skb->sp->xvec[i]; | |
2063 | if (!xfrm_selector_match(&x->sel, &fl, family)) { | |
2064 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH); | |
2065 | return 0; | |
2066 | } | |
2067 | } | |
2068 | } | |
2069 | ||
2070 | pol = NULL; | |
2071 | if (sk && sk->sk_policy[dir]) { | |
2072 | pol = xfrm_sk_policy_lookup(sk, dir, &fl); | |
2073 | if (IS_ERR(pol)) { | |
2074 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); | |
2075 | return 0; | |
2076 | } | |
2077 | } | |
2078 | ||
2079 | if (!pol) { | |
2080 | struct flow_cache_object *flo; | |
2081 | ||
2082 | flo = flow_cache_lookup(net, &fl, family, fl_dir, | |
2083 | xfrm_policy_lookup, NULL); | |
2084 | if (IS_ERR_OR_NULL(flo)) | |
2085 | pol = ERR_CAST(flo); | |
2086 | else | |
2087 | pol = container_of(flo, struct xfrm_policy, flo); | |
2088 | } | |
2089 | ||
2090 | if (IS_ERR(pol)) { | |
2091 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); | |
2092 | return 0; | |
2093 | } | |
2094 | ||
2095 | if (!pol) { | |
2096 | if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) { | |
2097 | xfrm_secpath_reject(xerr_idx, skb, &fl); | |
2098 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS); | |
2099 | return 0; | |
2100 | } | |
2101 | return 1; | |
2102 | } | |
2103 | ||
2104 | pol->curlft.use_time = get_seconds(); | |
2105 | ||
2106 | pols[0] = pol; | |
2107 | npols ++; | |
2108 | #ifdef CONFIG_XFRM_SUB_POLICY | |
2109 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
2110 | pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, | |
2111 | &fl, family, | |
2112 | XFRM_POLICY_IN); | |
2113 | if (pols[1]) { | |
2114 | if (IS_ERR(pols[1])) { | |
2115 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); | |
2116 | return 0; | |
2117 | } | |
2118 | pols[1]->curlft.use_time = get_seconds(); | |
2119 | npols ++; | |
2120 | } | |
2121 | } | |
2122 | #endif | |
2123 | ||
2124 | if (pol->action == XFRM_POLICY_ALLOW) { | |
2125 | struct sec_path *sp; | |
2126 | static struct sec_path dummy; | |
2127 | struct xfrm_tmpl *tp[XFRM_MAX_DEPTH]; | |
2128 | struct xfrm_tmpl *stp[XFRM_MAX_DEPTH]; | |
2129 | struct xfrm_tmpl **tpp = tp; | |
2130 | int ti = 0; | |
2131 | int i, k; | |
2132 | ||
2133 | if ((sp = skb->sp) == NULL) | |
2134 | sp = &dummy; | |
2135 | ||
2136 | for (pi = 0; pi < npols; pi++) { | |
2137 | if (pols[pi] != pol && | |
2138 | pols[pi]->action != XFRM_POLICY_ALLOW) { | |
2139 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); | |
2140 | goto reject; | |
2141 | } | |
2142 | if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
2143 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); | |
2144 | goto reject_error; | |
2145 | } | |
2146 | for (i = 0; i < pols[pi]->xfrm_nr; i++) | |
2147 | tpp[ti++] = &pols[pi]->xfrm_vec[i]; | |
2148 | } | |
2149 | xfrm_nr = ti; | |
2150 | if (npols > 1) { | |
2151 | xfrm_tmpl_sort(stp, tpp, xfrm_nr, family); | |
2152 | tpp = stp; | |
2153 | } | |
2154 | ||
2155 | /* For each tunnel xfrm, find the first matching tmpl. | |
2156 | * For each tmpl before that, find corresponding xfrm. | |
2157 | * Order is _important_. Later we will implement | |
2158 | * some barriers, but at the moment barriers | |
2159 | * are implied between each two transformations. | |
2160 | */ | |
2161 | for (i = xfrm_nr-1, k = 0; i >= 0; i--) { | |
2162 | k = xfrm_policy_ok(tpp[i], sp, k, family); | |
2163 | if (k < 0) { | |
2164 | if (k < -1) | |
2165 | /* "-2 - errored_index" returned */ | |
2166 | xerr_idx = -(2+k); | |
2167 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); | |
2168 | goto reject; | |
2169 | } | |
2170 | } | |
2171 | ||
2172 | if (secpath_has_nontransport(sp, k, &xerr_idx)) { | |
2173 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); | |
2174 | goto reject; | |
2175 | } | |
2176 | ||
2177 | xfrm_pols_put(pols, npols); | |
2178 | return 1; | |
2179 | } | |
2180 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); | |
2181 | ||
2182 | reject: | |
2183 | xfrm_secpath_reject(xerr_idx, skb, &fl); | |
2184 | reject_error: | |
2185 | xfrm_pols_put(pols, npols); | |
2186 | return 0; | |
2187 | } | |
2188 | EXPORT_SYMBOL(__xfrm_policy_check); | |
2189 | ||
2190 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
2191 | { | |
2192 | struct net *net = dev_net(skb->dev); | |
2193 | struct flowi fl; | |
2194 | struct dst_entry *dst; | |
2195 | int res = 1; | |
2196 | ||
2197 | if (xfrm_decode_session(skb, &fl, family) < 0) { | |
2198 | XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR); | |
2199 | return 0; | |
2200 | } | |
2201 | ||
2202 | skb_dst_force(skb); | |
2203 | ||
2204 | dst = xfrm_lookup(net, skb_dst(skb), &fl, NULL, 0); | |
2205 | if (IS_ERR(dst)) { | |
2206 | res = 0; | |
2207 | dst = NULL; | |
2208 | } | |
2209 | skb_dst_set(skb, dst); | |
2210 | return res; | |
2211 | } | |
2212 | EXPORT_SYMBOL(__xfrm_route_forward); | |
2213 | ||
2214 | /* Optimize later using cookies and generation ids. */ | |
2215 | ||
2216 | static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) | |
2217 | { | |
2218 | /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete | |
2219 | * to "-1" to force all XFRM destinations to get validated by | |
2220 | * dst_ops->check on every use. We do this because when a | |
2221 | * normal route referenced by an XFRM dst is obsoleted we do | |
2222 | * not go looking around for all parent referencing XFRM dsts | |
2223 | * so that we can invalidate them. It is just too much work. | |
2224 | * Instead we make the checks here on every use. For example: | |
2225 | * | |
2226 | * XFRM dst A --> IPv4 dst X | |
2227 | * | |
2228 | * X is the "xdst->route" of A (X is also the "dst->path" of A | |
2229 | * in this example). If X is marked obsolete, "A" will not | |
2230 | * notice. That's what we are validating here via the | |
2231 | * stale_bundle() check. | |
2232 | * | |
2233 | * When a policy's bundle is pruned, we dst_free() the XFRM | |
2234 | * dst which causes it's ->obsolete field to be set to a | |
2235 | * positive non-zero integer. If an XFRM dst has been pruned | |
2236 | * like this, we want to force a new route lookup. | |
2237 | */ | |
2238 | if (dst->obsolete < 0 && !stale_bundle(dst)) | |
2239 | return dst; | |
2240 | ||
2241 | return NULL; | |
2242 | } | |
2243 | ||
2244 | static int stale_bundle(struct dst_entry *dst) | |
2245 | { | |
2246 | return !xfrm_bundle_ok((struct xfrm_dst *)dst); | |
2247 | } | |
2248 | ||
2249 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) | |
2250 | { | |
2251 | while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { | |
2252 | dst->dev = dev_net(dev)->loopback_dev; | |
2253 | dev_hold(dst->dev); | |
2254 | dev_put(dev); | |
2255 | } | |
2256 | } | |
2257 | EXPORT_SYMBOL(xfrm_dst_ifdown); | |
2258 | ||
2259 | static void xfrm_link_failure(struct sk_buff *skb) | |
2260 | { | |
2261 | /* Impossible. Such dst must be popped before reaches point of failure. */ | |
2262 | } | |
2263 | ||
2264 | static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) | |
2265 | { | |
2266 | if (dst) { | |
2267 | if (dst->obsolete) { | |
2268 | dst_release(dst); | |
2269 | dst = NULL; | |
2270 | } | |
2271 | } | |
2272 | return dst; | |
2273 | } | |
2274 | ||
2275 | static void __xfrm_garbage_collect(struct net *net) | |
2276 | { | |
2277 | struct dst_entry *head, *next; | |
2278 | ||
2279 | spin_lock_bh(&xfrm_policy_sk_bundle_lock); | |
2280 | head = xfrm_policy_sk_bundles; | |
2281 | xfrm_policy_sk_bundles = NULL; | |
2282 | spin_unlock_bh(&xfrm_policy_sk_bundle_lock); | |
2283 | ||
2284 | while (head) { | |
2285 | next = head->next; | |
2286 | dst_free(head); | |
2287 | head = next; | |
2288 | } | |
2289 | } | |
2290 | ||
2291 | static void xfrm_garbage_collect(struct net *net) | |
2292 | { | |
2293 | flow_cache_flush(); | |
2294 | __xfrm_garbage_collect(net); | |
2295 | } | |
2296 | ||
2297 | static void xfrm_garbage_collect_deferred(struct net *net) | |
2298 | { | |
2299 | flow_cache_flush_deferred(); | |
2300 | __xfrm_garbage_collect(net); | |
2301 | } | |
2302 | ||
2303 | static void xfrm_init_pmtu(struct dst_entry *dst) | |
2304 | { | |
2305 | do { | |
2306 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2307 | u32 pmtu, route_mtu_cached; | |
2308 | ||
2309 | pmtu = dst_mtu(dst->child); | |
2310 | xdst->child_mtu_cached = pmtu; | |
2311 | ||
2312 | pmtu = xfrm_state_mtu(dst->xfrm, pmtu); | |
2313 | ||
2314 | route_mtu_cached = dst_mtu(xdst->route); | |
2315 | xdst->route_mtu_cached = route_mtu_cached; | |
2316 | ||
2317 | if (pmtu > route_mtu_cached) | |
2318 | pmtu = route_mtu_cached; | |
2319 | ||
2320 | dst_metric_set(dst, RTAX_MTU, pmtu); | |
2321 | } while ((dst = dst->next)); | |
2322 | } | |
2323 | ||
2324 | /* Check that the bundle accepts the flow and its components are | |
2325 | * still valid. | |
2326 | */ | |
2327 | ||
2328 | static int xfrm_bundle_ok(struct xfrm_dst *first) | |
2329 | { | |
2330 | struct dst_entry *dst = &first->u.dst; | |
2331 | struct xfrm_dst *last; | |
2332 | u32 mtu; | |
2333 | ||
2334 | if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || | |
2335 | (dst->dev && !netif_running(dst->dev))) | |
2336 | return 0; | |
2337 | ||
2338 | last = NULL; | |
2339 | ||
2340 | do { | |
2341 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2342 | ||
2343 | if (dst->xfrm->km.state != XFRM_STATE_VALID) | |
2344 | return 0; | |
2345 | if (xdst->xfrm_genid != dst->xfrm->genid) | |
2346 | return 0; | |
2347 | if (xdst->num_pols > 0 && | |
2348 | xdst->policy_genid != atomic_read(&xdst->pols[0]->genid)) | |
2349 | return 0; | |
2350 | ||
2351 | mtu = dst_mtu(dst->child); | |
2352 | if (xdst->child_mtu_cached != mtu) { | |
2353 | last = xdst; | |
2354 | xdst->child_mtu_cached = mtu; | |
2355 | } | |
2356 | ||
2357 | if (!dst_check(xdst->route, xdst->route_cookie)) | |
2358 | return 0; | |
2359 | mtu = dst_mtu(xdst->route); | |
2360 | if (xdst->route_mtu_cached != mtu) { | |
2361 | last = xdst; | |
2362 | xdst->route_mtu_cached = mtu; | |
2363 | } | |
2364 | ||
2365 | dst = dst->child; | |
2366 | } while (dst->xfrm); | |
2367 | ||
2368 | if (likely(!last)) | |
2369 | return 1; | |
2370 | ||
2371 | mtu = last->child_mtu_cached; | |
2372 | for (;;) { | |
2373 | dst = &last->u.dst; | |
2374 | ||
2375 | mtu = xfrm_state_mtu(dst->xfrm, mtu); | |
2376 | if (mtu > last->route_mtu_cached) | |
2377 | mtu = last->route_mtu_cached; | |
2378 | dst_metric_set(dst, RTAX_MTU, mtu); | |
2379 | ||
2380 | if (last == first) | |
2381 | break; | |
2382 | ||
2383 | last = (struct xfrm_dst *)last->u.dst.next; | |
2384 | last->child_mtu_cached = mtu; | |
2385 | } | |
2386 | ||
2387 | return 1; | |
2388 | } | |
2389 | ||
2390 | static unsigned int xfrm_default_advmss(const struct dst_entry *dst) | |
2391 | { | |
2392 | return dst_metric_advmss(dst->path); | |
2393 | } | |
2394 | ||
2395 | static unsigned int xfrm_mtu(const struct dst_entry *dst) | |
2396 | { | |
2397 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); | |
2398 | ||
2399 | return mtu ? : dst_mtu(dst->path); | |
2400 | } | |
2401 | ||
2402 | static struct neighbour *xfrm_neigh_lookup(const struct dst_entry *dst, const void *daddr) | |
2403 | { | |
2404 | return dst_neigh_lookup(dst->path, daddr); | |
2405 | } | |
2406 | ||
2407 | int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2408 | { | |
2409 | struct net *net; | |
2410 | int err = 0; | |
2411 | if (unlikely(afinfo == NULL)) | |
2412 | return -EINVAL; | |
2413 | if (unlikely(afinfo->family >= NPROTO)) | |
2414 | return -EAFNOSUPPORT; | |
2415 | write_lock_bh(&xfrm_policy_afinfo_lock); | |
2416 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) | |
2417 | err = -ENOBUFS; | |
2418 | else { | |
2419 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2420 | if (likely(dst_ops->kmem_cachep == NULL)) | |
2421 | dst_ops->kmem_cachep = xfrm_dst_cache; | |
2422 | if (likely(dst_ops->check == NULL)) | |
2423 | dst_ops->check = xfrm_dst_check; | |
2424 | if (likely(dst_ops->default_advmss == NULL)) | |
2425 | dst_ops->default_advmss = xfrm_default_advmss; | |
2426 | if (likely(dst_ops->mtu == NULL)) | |
2427 | dst_ops->mtu = xfrm_mtu; | |
2428 | if (likely(dst_ops->negative_advice == NULL)) | |
2429 | dst_ops->negative_advice = xfrm_negative_advice; | |
2430 | if (likely(dst_ops->link_failure == NULL)) | |
2431 | dst_ops->link_failure = xfrm_link_failure; | |
2432 | if (likely(dst_ops->neigh_lookup == NULL)) | |
2433 | dst_ops->neigh_lookup = xfrm_neigh_lookup; | |
2434 | if (likely(afinfo->garbage_collect == NULL)) | |
2435 | afinfo->garbage_collect = xfrm_garbage_collect_deferred; | |
2436 | xfrm_policy_afinfo[afinfo->family] = afinfo; | |
2437 | } | |
2438 | write_unlock_bh(&xfrm_policy_afinfo_lock); | |
2439 | ||
2440 | rtnl_lock(); | |
2441 | for_each_net(net) { | |
2442 | struct dst_ops *xfrm_dst_ops; | |
2443 | ||
2444 | switch (afinfo->family) { | |
2445 | case AF_INET: | |
2446 | xfrm_dst_ops = &net->xfrm.xfrm4_dst_ops; | |
2447 | break; | |
2448 | #if IS_ENABLED(CONFIG_IPV6) | |
2449 | case AF_INET6: | |
2450 | xfrm_dst_ops = &net->xfrm.xfrm6_dst_ops; | |
2451 | break; | |
2452 | #endif | |
2453 | default: | |
2454 | BUG(); | |
2455 | } | |
2456 | *xfrm_dst_ops = *afinfo->dst_ops; | |
2457 | } | |
2458 | rtnl_unlock(); | |
2459 | ||
2460 | return err; | |
2461 | } | |
2462 | EXPORT_SYMBOL(xfrm_policy_register_afinfo); | |
2463 | ||
2464 | int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2465 | { | |
2466 | int err = 0; | |
2467 | if (unlikely(afinfo == NULL)) | |
2468 | return -EINVAL; | |
2469 | if (unlikely(afinfo->family >= NPROTO)) | |
2470 | return -EAFNOSUPPORT; | |
2471 | write_lock_bh(&xfrm_policy_afinfo_lock); | |
2472 | if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { | |
2473 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) | |
2474 | err = -EINVAL; | |
2475 | else { | |
2476 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2477 | xfrm_policy_afinfo[afinfo->family] = NULL; | |
2478 | dst_ops->kmem_cachep = NULL; | |
2479 | dst_ops->check = NULL; | |
2480 | dst_ops->negative_advice = NULL; | |
2481 | dst_ops->link_failure = NULL; | |
2482 | afinfo->garbage_collect = NULL; | |
2483 | } | |
2484 | } | |
2485 | write_unlock_bh(&xfrm_policy_afinfo_lock); | |
2486 | return err; | |
2487 | } | |
2488 | EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); | |
2489 | ||
2490 | static void __net_init xfrm_dst_ops_init(struct net *net) | |
2491 | { | |
2492 | struct xfrm_policy_afinfo *afinfo; | |
2493 | ||
2494 | read_lock_bh(&xfrm_policy_afinfo_lock); | |
2495 | afinfo = xfrm_policy_afinfo[AF_INET]; | |
2496 | if (afinfo) | |
2497 | net->xfrm.xfrm4_dst_ops = *afinfo->dst_ops; | |
2498 | #if IS_ENABLED(CONFIG_IPV6) | |
2499 | afinfo = xfrm_policy_afinfo[AF_INET6]; | |
2500 | if (afinfo) | |
2501 | net->xfrm.xfrm6_dst_ops = *afinfo->dst_ops; | |
2502 | #endif | |
2503 | read_unlock_bh(&xfrm_policy_afinfo_lock); | |
2504 | } | |
2505 | ||
2506 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) | |
2507 | { | |
2508 | struct xfrm_policy_afinfo *afinfo; | |
2509 | if (unlikely(family >= NPROTO)) | |
2510 | return NULL; | |
2511 | read_lock(&xfrm_policy_afinfo_lock); | |
2512 | afinfo = xfrm_policy_afinfo[family]; | |
2513 | if (unlikely(!afinfo)) | |
2514 | read_unlock(&xfrm_policy_afinfo_lock); | |
2515 | return afinfo; | |
2516 | } | |
2517 | ||
2518 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2519 | { | |
2520 | read_unlock(&xfrm_policy_afinfo_lock); | |
2521 | } | |
2522 | ||
2523 | static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
2524 | { | |
2525 | struct net_device *dev = ptr; | |
2526 | ||
2527 | switch (event) { | |
2528 | case NETDEV_DOWN: | |
2529 | xfrm_garbage_collect(dev_net(dev)); | |
2530 | } | |
2531 | return NOTIFY_DONE; | |
2532 | } | |
2533 | ||
2534 | static struct notifier_block xfrm_dev_notifier = { | |
2535 | .notifier_call = xfrm_dev_event, | |
2536 | }; | |
2537 | ||
2538 | #ifdef CONFIG_XFRM_STATISTICS | |
2539 | static int __net_init xfrm_statistics_init(struct net *net) | |
2540 | { | |
2541 | int rv; | |
2542 | ||
2543 | if (snmp_mib_init((void __percpu **)net->mib.xfrm_statistics, | |
2544 | sizeof(struct linux_xfrm_mib), | |
2545 | __alignof__(struct linux_xfrm_mib)) < 0) | |
2546 | return -ENOMEM; | |
2547 | rv = xfrm_proc_init(net); | |
2548 | if (rv < 0) | |
2549 | snmp_mib_free((void __percpu **)net->mib.xfrm_statistics); | |
2550 | return rv; | |
2551 | } | |
2552 | ||
2553 | static void xfrm_statistics_fini(struct net *net) | |
2554 | { | |
2555 | xfrm_proc_fini(net); | |
2556 | snmp_mib_free((void __percpu **)net->mib.xfrm_statistics); | |
2557 | } | |
2558 | #else | |
2559 | static int __net_init xfrm_statistics_init(struct net *net) | |
2560 | { | |
2561 | return 0; | |
2562 | } | |
2563 | ||
2564 | static void xfrm_statistics_fini(struct net *net) | |
2565 | { | |
2566 | } | |
2567 | #endif | |
2568 | ||
2569 | static int __net_init xfrm_policy_init(struct net *net) | |
2570 | { | |
2571 | unsigned int hmask, sz; | |
2572 | int dir; | |
2573 | ||
2574 | if (net_eq(net, &init_net)) | |
2575 | xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", | |
2576 | sizeof(struct xfrm_dst), | |
2577 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, | |
2578 | NULL); | |
2579 | ||
2580 | hmask = 8 - 1; | |
2581 | sz = (hmask+1) * sizeof(struct hlist_head); | |
2582 | ||
2583 | net->xfrm.policy_byidx = xfrm_hash_alloc(sz); | |
2584 | if (!net->xfrm.policy_byidx) | |
2585 | goto out_byidx; | |
2586 | net->xfrm.policy_idx_hmask = hmask; | |
2587 | ||
2588 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
2589 | struct xfrm_policy_hash *htab; | |
2590 | ||
2591 | net->xfrm.policy_count[dir] = 0; | |
2592 | INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]); | |
2593 | ||
2594 | htab = &net->xfrm.policy_bydst[dir]; | |
2595 | htab->table = xfrm_hash_alloc(sz); | |
2596 | if (!htab->table) | |
2597 | goto out_bydst; | |
2598 | htab->hmask = hmask; | |
2599 | } | |
2600 | ||
2601 | INIT_LIST_HEAD(&net->xfrm.policy_all); | |
2602 | INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize); | |
2603 | if (net_eq(net, &init_net)) | |
2604 | register_netdevice_notifier(&xfrm_dev_notifier); | |
2605 | return 0; | |
2606 | ||
2607 | out_bydst: | |
2608 | for (dir--; dir >= 0; dir--) { | |
2609 | struct xfrm_policy_hash *htab; | |
2610 | ||
2611 | htab = &net->xfrm.policy_bydst[dir]; | |
2612 | xfrm_hash_free(htab->table, sz); | |
2613 | } | |
2614 | xfrm_hash_free(net->xfrm.policy_byidx, sz); | |
2615 | out_byidx: | |
2616 | return -ENOMEM; | |
2617 | } | |
2618 | ||
2619 | static void xfrm_policy_fini(struct net *net) | |
2620 | { | |
2621 | struct xfrm_audit audit_info; | |
2622 | unsigned int sz; | |
2623 | int dir; | |
2624 | ||
2625 | flush_work(&net->xfrm.policy_hash_work); | |
2626 | #ifdef CONFIG_XFRM_SUB_POLICY | |
2627 | audit_info.loginuid = -1; | |
2628 | audit_info.sessionid = -1; | |
2629 | audit_info.secid = 0; | |
2630 | xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, &audit_info); | |
2631 | #endif | |
2632 | audit_info.loginuid = -1; | |
2633 | audit_info.sessionid = -1; | |
2634 | audit_info.secid = 0; | |
2635 | xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info); | |
2636 | ||
2637 | WARN_ON(!list_empty(&net->xfrm.policy_all)); | |
2638 | ||
2639 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
2640 | struct xfrm_policy_hash *htab; | |
2641 | ||
2642 | WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir])); | |
2643 | ||
2644 | htab = &net->xfrm.policy_bydst[dir]; | |
2645 | sz = (htab->hmask + 1); | |
2646 | WARN_ON(!hlist_empty(htab->table)); | |
2647 | xfrm_hash_free(htab->table, sz); | |
2648 | } | |
2649 | ||
2650 | sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head); | |
2651 | WARN_ON(!hlist_empty(net->xfrm.policy_byidx)); | |
2652 | xfrm_hash_free(net->xfrm.policy_byidx, sz); | |
2653 | } | |
2654 | ||
2655 | static int __net_init xfrm_net_init(struct net *net) | |
2656 | { | |
2657 | int rv; | |
2658 | ||
2659 | rv = xfrm_statistics_init(net); | |
2660 | if (rv < 0) | |
2661 | goto out_statistics; | |
2662 | rv = xfrm_state_init(net); | |
2663 | if (rv < 0) | |
2664 | goto out_state; | |
2665 | rv = xfrm_policy_init(net); | |
2666 | if (rv < 0) | |
2667 | goto out_policy; | |
2668 | xfrm_dst_ops_init(net); | |
2669 | rv = xfrm_sysctl_init(net); | |
2670 | if (rv < 0) | |
2671 | goto out_sysctl; | |
2672 | return 0; | |
2673 | ||
2674 | out_sysctl: | |
2675 | xfrm_policy_fini(net); | |
2676 | out_policy: | |
2677 | xfrm_state_fini(net); | |
2678 | out_state: | |
2679 | xfrm_statistics_fini(net); | |
2680 | out_statistics: | |
2681 | return rv; | |
2682 | } | |
2683 | ||
2684 | static void __net_exit xfrm_net_exit(struct net *net) | |
2685 | { | |
2686 | xfrm_sysctl_fini(net); | |
2687 | xfrm_policy_fini(net); | |
2688 | xfrm_state_fini(net); | |
2689 | xfrm_statistics_fini(net); | |
2690 | } | |
2691 | ||
2692 | static struct pernet_operations __net_initdata xfrm_net_ops = { | |
2693 | .init = xfrm_net_init, | |
2694 | .exit = xfrm_net_exit, | |
2695 | }; | |
2696 | ||
2697 | void __init xfrm_init(void) | |
2698 | { | |
2699 | register_pernet_subsys(&xfrm_net_ops); | |
2700 | xfrm_input_init(); | |
2701 | } | |
2702 | ||
2703 | #ifdef CONFIG_AUDITSYSCALL | |
2704 | static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp, | |
2705 | struct audit_buffer *audit_buf) | |
2706 | { | |
2707 | struct xfrm_sec_ctx *ctx = xp->security; | |
2708 | struct xfrm_selector *sel = &xp->selector; | |
2709 | ||
2710 | if (ctx) | |
2711 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", | |
2712 | ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); | |
2713 | ||
2714 | switch(sel->family) { | |
2715 | case AF_INET: | |
2716 | audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4); | |
2717 | if (sel->prefixlen_s != 32) | |
2718 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2719 | sel->prefixlen_s); | |
2720 | audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4); | |
2721 | if (sel->prefixlen_d != 32) | |
2722 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2723 | sel->prefixlen_d); | |
2724 | break; | |
2725 | case AF_INET6: | |
2726 | audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6); | |
2727 | if (sel->prefixlen_s != 128) | |
2728 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2729 | sel->prefixlen_s); | |
2730 | audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6); | |
2731 | if (sel->prefixlen_d != 128) | |
2732 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2733 | sel->prefixlen_d); | |
2734 | break; | |
2735 | } | |
2736 | } | |
2737 | ||
2738 | void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, | |
2739 | uid_t auid, u32 sessionid, u32 secid) | |
2740 | { | |
2741 | struct audit_buffer *audit_buf; | |
2742 | ||
2743 | audit_buf = xfrm_audit_start("SPD-add"); | |
2744 | if (audit_buf == NULL) | |
2745 | return; | |
2746 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); | |
2747 | audit_log_format(audit_buf, " res=%u", result); | |
2748 | xfrm_audit_common_policyinfo(xp, audit_buf); | |
2749 | audit_log_end(audit_buf); | |
2750 | } | |
2751 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_add); | |
2752 | ||
2753 | void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, | |
2754 | uid_t auid, u32 sessionid, u32 secid) | |
2755 | { | |
2756 | struct audit_buffer *audit_buf; | |
2757 | ||
2758 | audit_buf = xfrm_audit_start("SPD-delete"); | |
2759 | if (audit_buf == NULL) | |
2760 | return; | |
2761 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); | |
2762 | audit_log_format(audit_buf, " res=%u", result); | |
2763 | xfrm_audit_common_policyinfo(xp, audit_buf); | |
2764 | audit_log_end(audit_buf); | |
2765 | } | |
2766 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete); | |
2767 | #endif | |
2768 | ||
2769 | #ifdef CONFIG_XFRM_MIGRATE | |
2770 | static int xfrm_migrate_selector_match(const struct xfrm_selector *sel_cmp, | |
2771 | const struct xfrm_selector *sel_tgt) | |
2772 | { | |
2773 | if (sel_cmp->proto == IPSEC_ULPROTO_ANY) { | |
2774 | if (sel_tgt->family == sel_cmp->family && | |
2775 | xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr, | |
2776 | sel_cmp->family) == 0 && | |
2777 | xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr, | |
2778 | sel_cmp->family) == 0 && | |
2779 | sel_tgt->prefixlen_d == sel_cmp->prefixlen_d && | |
2780 | sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) { | |
2781 | return 1; | |
2782 | } | |
2783 | } else { | |
2784 | if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) { | |
2785 | return 1; | |
2786 | } | |
2787 | } | |
2788 | return 0; | |
2789 | } | |
2790 | ||
2791 | static struct xfrm_policy * xfrm_migrate_policy_find(const struct xfrm_selector *sel, | |
2792 | u8 dir, u8 type) | |
2793 | { | |
2794 | struct xfrm_policy *pol, *ret = NULL; | |
2795 | struct hlist_node *entry; | |
2796 | struct hlist_head *chain; | |
2797 | u32 priority = ~0U; | |
2798 | ||
2799 | read_lock_bh(&xfrm_policy_lock); | |
2800 | chain = policy_hash_direct(&init_net, &sel->daddr, &sel->saddr, sel->family, dir); | |
2801 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
2802 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2803 | pol->type == type) { | |
2804 | ret = pol; | |
2805 | priority = ret->priority; | |
2806 | break; | |
2807 | } | |
2808 | } | |
2809 | chain = &init_net.xfrm.policy_inexact[dir]; | |
2810 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
2811 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2812 | pol->type == type && | |
2813 | pol->priority < priority) { | |
2814 | ret = pol; | |
2815 | break; | |
2816 | } | |
2817 | } | |
2818 | ||
2819 | if (ret) | |
2820 | xfrm_pol_hold(ret); | |
2821 | ||
2822 | read_unlock_bh(&xfrm_policy_lock); | |
2823 | ||
2824 | return ret; | |
2825 | } | |
2826 | ||
2827 | static int migrate_tmpl_match(const struct xfrm_migrate *m, const struct xfrm_tmpl *t) | |
2828 | { | |
2829 | int match = 0; | |
2830 | ||
2831 | if (t->mode == m->mode && t->id.proto == m->proto && | |
2832 | (m->reqid == 0 || t->reqid == m->reqid)) { | |
2833 | switch (t->mode) { | |
2834 | case XFRM_MODE_TUNNEL: | |
2835 | case XFRM_MODE_BEET: | |
2836 | if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr, | |
2837 | m->old_family) == 0 && | |
2838 | xfrm_addr_cmp(&t->saddr, &m->old_saddr, | |
2839 | m->old_family) == 0) { | |
2840 | match = 1; | |
2841 | } | |
2842 | break; | |
2843 | case XFRM_MODE_TRANSPORT: | |
2844 | /* in case of transport mode, template does not store | |
2845 | any IP addresses, hence we just compare mode and | |
2846 | protocol */ | |
2847 | match = 1; | |
2848 | break; | |
2849 | default: | |
2850 | break; | |
2851 | } | |
2852 | } | |
2853 | return match; | |
2854 | } | |
2855 | ||
2856 | /* update endpoint address(es) of template(s) */ | |
2857 | static int xfrm_policy_migrate(struct xfrm_policy *pol, | |
2858 | struct xfrm_migrate *m, int num_migrate) | |
2859 | { | |
2860 | struct xfrm_migrate *mp; | |
2861 | int i, j, n = 0; | |
2862 | ||
2863 | write_lock_bh(&pol->lock); | |
2864 | if (unlikely(pol->walk.dead)) { | |
2865 | /* target policy has been deleted */ | |
2866 | write_unlock_bh(&pol->lock); | |
2867 | return -ENOENT; | |
2868 | } | |
2869 | ||
2870 | for (i = 0; i < pol->xfrm_nr; i++) { | |
2871 | for (j = 0, mp = m; j < num_migrate; j++, mp++) { | |
2872 | if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i])) | |
2873 | continue; | |
2874 | n++; | |
2875 | if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL && | |
2876 | pol->xfrm_vec[i].mode != XFRM_MODE_BEET) | |
2877 | continue; | |
2878 | /* update endpoints */ | |
2879 | memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr, | |
2880 | sizeof(pol->xfrm_vec[i].id.daddr)); | |
2881 | memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr, | |
2882 | sizeof(pol->xfrm_vec[i].saddr)); | |
2883 | pol->xfrm_vec[i].encap_family = mp->new_family; | |
2884 | /* flush bundles */ | |
2885 | atomic_inc(&pol->genid); | |
2886 | } | |
2887 | } | |
2888 | ||
2889 | write_unlock_bh(&pol->lock); | |
2890 | ||
2891 | if (!n) | |
2892 | return -ENODATA; | |
2893 | ||
2894 | return 0; | |
2895 | } | |
2896 | ||
2897 | static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate) | |
2898 | { | |
2899 | int i, j; | |
2900 | ||
2901 | if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) | |
2902 | return -EINVAL; | |
2903 | ||
2904 | for (i = 0; i < num_migrate; i++) { | |
2905 | if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr, | |
2906 | m[i].old_family) == 0) && | |
2907 | (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr, | |
2908 | m[i].old_family) == 0)) | |
2909 | return -EINVAL; | |
2910 | if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) || | |
2911 | xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) | |
2912 | return -EINVAL; | |
2913 | ||
2914 | /* check if there is any duplicated entry */ | |
2915 | for (j = i + 1; j < num_migrate; j++) { | |
2916 | if (!memcmp(&m[i].old_daddr, &m[j].old_daddr, | |
2917 | sizeof(m[i].old_daddr)) && | |
2918 | !memcmp(&m[i].old_saddr, &m[j].old_saddr, | |
2919 | sizeof(m[i].old_saddr)) && | |
2920 | m[i].proto == m[j].proto && | |
2921 | m[i].mode == m[j].mode && | |
2922 | m[i].reqid == m[j].reqid && | |
2923 | m[i].old_family == m[j].old_family) | |
2924 | return -EINVAL; | |
2925 | } | |
2926 | } | |
2927 | ||
2928 | return 0; | |
2929 | } | |
2930 | ||
2931 | int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, | |
2932 | struct xfrm_migrate *m, int num_migrate, | |
2933 | struct xfrm_kmaddress *k) | |
2934 | { | |
2935 | int i, err, nx_cur = 0, nx_new = 0; | |
2936 | struct xfrm_policy *pol = NULL; | |
2937 | struct xfrm_state *x, *xc; | |
2938 | struct xfrm_state *x_cur[XFRM_MAX_DEPTH]; | |
2939 | struct xfrm_state *x_new[XFRM_MAX_DEPTH]; | |
2940 | struct xfrm_migrate *mp; | |
2941 | ||
2942 | if ((err = xfrm_migrate_check(m, num_migrate)) < 0) | |
2943 | goto out; | |
2944 | ||
2945 | /* Stage 1 - find policy */ | |
2946 | if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) { | |
2947 | err = -ENOENT; | |
2948 | goto out; | |
2949 | } | |
2950 | ||
2951 | /* Stage 2 - find and update state(s) */ | |
2952 | for (i = 0, mp = m; i < num_migrate; i++, mp++) { | |
2953 | if ((x = xfrm_migrate_state_find(mp))) { | |
2954 | x_cur[nx_cur] = x; | |
2955 | nx_cur++; | |
2956 | if ((xc = xfrm_state_migrate(x, mp))) { | |
2957 | x_new[nx_new] = xc; | |
2958 | nx_new++; | |
2959 | } else { | |
2960 | err = -ENODATA; | |
2961 | goto restore_state; | |
2962 | } | |
2963 | } | |
2964 | } | |
2965 | ||
2966 | /* Stage 3 - update policy */ | |
2967 | if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0) | |
2968 | goto restore_state; | |
2969 | ||
2970 | /* Stage 4 - delete old state(s) */ | |
2971 | if (nx_cur) { | |
2972 | xfrm_states_put(x_cur, nx_cur); | |
2973 | xfrm_states_delete(x_cur, nx_cur); | |
2974 | } | |
2975 | ||
2976 | /* Stage 5 - announce */ | |
2977 | km_migrate(sel, dir, type, m, num_migrate, k); | |
2978 | ||
2979 | xfrm_pol_put(pol); | |
2980 | ||
2981 | return 0; | |
2982 | out: | |
2983 | return err; | |
2984 | ||
2985 | restore_state: | |
2986 | if (pol) | |
2987 | xfrm_pol_put(pol); | |
2988 | if (nx_cur) | |
2989 | xfrm_states_put(x_cur, nx_cur); | |
2990 | if (nx_new) | |
2991 | xfrm_states_delete(x_new, nx_new); | |
2992 | ||
2993 | return err; | |
2994 | } | |
2995 | EXPORT_SYMBOL(xfrm_migrate); | |
2996 | #endif |