Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * xfrm_state.c | |
3 | * | |
4 | * Changes: | |
5 | * Mitsuru KANDA @USAGI | |
6 | * Kazunori MIYAZAWA @USAGI | |
7 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> | |
8 | * IPv6 support | |
9 | * YOSHIFUJI Hideaki @USAGI | |
10 | * Split up af-specific functions | |
11 | * Derek Atkins <derek@ihtfp.com> | |
12 | * Add UDP Encapsulation | |
df71837d | 13 | * |
1da177e4 LT |
14 | */ |
15 | ||
16 | #include <linux/workqueue.h> | |
17 | #include <net/xfrm.h> | |
18 | #include <linux/pfkeyv2.h> | |
19 | #include <linux/ipsec.h> | |
20 | #include <linux/module.h> | |
f034b5d4 | 21 | #include <linux/cache.h> |
68277acc | 22 | #include <linux/audit.h> |
b5890d8b | 23 | #include <asm/uaccess.h> |
9e0d57fd YP |
24 | #include <linux/ktime.h> |
25 | #include <linux/interrupt.h> | |
26 | #include <linux/kernel.h> | |
1da177e4 | 27 | |
44e36b42 DM |
28 | #include "xfrm_hash.h" |
29 | ||
1da177e4 LT |
30 | /* Each xfrm_state may be linked to two tables: |
31 | ||
32 | 1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl) | |
a624c108 | 33 | 2. Hash table by (daddr,family,reqid) to find what SAs exist for given |
1da177e4 LT |
34 | destination/tunnel endpoint. (output) |
35 | */ | |
36 | ||
37 | static DEFINE_SPINLOCK(xfrm_state_lock); | |
38 | ||
f034b5d4 | 39 | static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024; |
9d4a706d | 40 | static unsigned int xfrm_state_genid; |
f034b5d4 | 41 | |
17c2a42a HX |
42 | static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family); |
43 | static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo); | |
44 | ||
afeb14b4 PM |
45 | #ifdef CONFIG_AUDITSYSCALL |
46 | static void xfrm_audit_state_replay(struct xfrm_state *x, | |
47 | struct sk_buff *skb, __be32 net_seq); | |
48 | #else | |
49 | #define xfrm_audit_state_replay(x, s, sq) do { ; } while (0) | |
50 | #endif /* CONFIG_AUDITSYSCALL */ | |
51 | ||
64d0cd00 AD |
52 | static inline unsigned int xfrm_dst_hash(struct net *net, |
53 | xfrm_address_t *daddr, | |
c1969f29 DM |
54 | xfrm_address_t *saddr, |
55 | u32 reqid, | |
a624c108 | 56 | unsigned short family) |
f034b5d4 | 57 | { |
64d0cd00 | 58 | return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask); |
f034b5d4 DM |
59 | } |
60 | ||
64d0cd00 AD |
61 | static inline unsigned int xfrm_src_hash(struct net *net, |
62 | xfrm_address_t *daddr, | |
667bbcb6 | 63 | xfrm_address_t *saddr, |
44e36b42 | 64 | unsigned short family) |
f034b5d4 | 65 | { |
64d0cd00 | 66 | return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask); |
f034b5d4 DM |
67 | } |
68 | ||
f034b5d4 | 69 | static inline unsigned int |
64d0cd00 | 70 | xfrm_spi_hash(struct net *net, xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family) |
f034b5d4 | 71 | { |
64d0cd00 | 72 | return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask); |
f034b5d4 DM |
73 | } |
74 | ||
f034b5d4 DM |
75 | static void xfrm_hash_transfer(struct hlist_head *list, |
76 | struct hlist_head *ndsttable, | |
77 | struct hlist_head *nsrctable, | |
78 | struct hlist_head *nspitable, | |
79 | unsigned int nhashmask) | |
80 | { | |
81 | struct hlist_node *entry, *tmp; | |
82 | struct xfrm_state *x; | |
83 | ||
84 | hlist_for_each_entry_safe(x, entry, tmp, list, bydst) { | |
85 | unsigned int h; | |
86 | ||
c1969f29 DM |
87 | h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr, |
88 | x->props.reqid, x->props.family, | |
89 | nhashmask); | |
f034b5d4 DM |
90 | hlist_add_head(&x->bydst, ndsttable+h); |
91 | ||
667bbcb6 MN |
92 | h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr, |
93 | x->props.family, | |
f034b5d4 DM |
94 | nhashmask); |
95 | hlist_add_head(&x->bysrc, nsrctable+h); | |
96 | ||
7b4dc360 MN |
97 | if (x->id.spi) { |
98 | h = __xfrm_spi_hash(&x->id.daddr, x->id.spi, | |
99 | x->id.proto, x->props.family, | |
100 | nhashmask); | |
101 | hlist_add_head(&x->byspi, nspitable+h); | |
102 | } | |
f034b5d4 DM |
103 | } |
104 | } | |
105 | ||
63082733 | 106 | static unsigned long xfrm_hash_new_size(unsigned int state_hmask) |
f034b5d4 | 107 | { |
63082733 | 108 | return ((state_hmask + 1) << 1) * sizeof(struct hlist_head); |
f034b5d4 DM |
109 | } |
110 | ||
111 | static DEFINE_MUTEX(hash_resize_mutex); | |
112 | ||
63082733 | 113 | static void xfrm_hash_resize(struct work_struct *work) |
f034b5d4 | 114 | { |
63082733 | 115 | struct net *net = container_of(work, struct net, xfrm.state_hash_work); |
f034b5d4 DM |
116 | struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi; |
117 | unsigned long nsize, osize; | |
118 | unsigned int nhashmask, ohashmask; | |
119 | int i; | |
120 | ||
121 | mutex_lock(&hash_resize_mutex); | |
122 | ||
63082733 | 123 | nsize = xfrm_hash_new_size(net->xfrm.state_hmask); |
44e36b42 | 124 | ndst = xfrm_hash_alloc(nsize); |
f034b5d4 DM |
125 | if (!ndst) |
126 | goto out_unlock; | |
44e36b42 | 127 | nsrc = xfrm_hash_alloc(nsize); |
f034b5d4 | 128 | if (!nsrc) { |
44e36b42 | 129 | xfrm_hash_free(ndst, nsize); |
f034b5d4 DM |
130 | goto out_unlock; |
131 | } | |
44e36b42 | 132 | nspi = xfrm_hash_alloc(nsize); |
f034b5d4 | 133 | if (!nspi) { |
44e36b42 DM |
134 | xfrm_hash_free(ndst, nsize); |
135 | xfrm_hash_free(nsrc, nsize); | |
f034b5d4 DM |
136 | goto out_unlock; |
137 | } | |
138 | ||
139 | spin_lock_bh(&xfrm_state_lock); | |
140 | ||
141 | nhashmask = (nsize / sizeof(struct hlist_head)) - 1U; | |
63082733 AD |
142 | for (i = net->xfrm.state_hmask; i >= 0; i--) |
143 | xfrm_hash_transfer(net->xfrm.state_bydst+i, ndst, nsrc, nspi, | |
f034b5d4 DM |
144 | nhashmask); |
145 | ||
63082733 AD |
146 | odst = net->xfrm.state_bydst; |
147 | osrc = net->xfrm.state_bysrc; | |
148 | ospi = net->xfrm.state_byspi; | |
149 | ohashmask = net->xfrm.state_hmask; | |
f034b5d4 | 150 | |
63082733 AD |
151 | net->xfrm.state_bydst = ndst; |
152 | net->xfrm.state_bysrc = nsrc; | |
153 | net->xfrm.state_byspi = nspi; | |
154 | net->xfrm.state_hmask = nhashmask; | |
f034b5d4 DM |
155 | |
156 | spin_unlock_bh(&xfrm_state_lock); | |
157 | ||
158 | osize = (ohashmask + 1) * sizeof(struct hlist_head); | |
44e36b42 DM |
159 | xfrm_hash_free(odst, osize); |
160 | xfrm_hash_free(osrc, osize); | |
161 | xfrm_hash_free(ospi, osize); | |
f034b5d4 DM |
162 | |
163 | out_unlock: | |
164 | mutex_unlock(&hash_resize_mutex); | |
165 | } | |
166 | ||
1da177e4 LT |
167 | static DEFINE_RWLOCK(xfrm_state_afinfo_lock); |
168 | static struct xfrm_state_afinfo *xfrm_state_afinfo[NPROTO]; | |
169 | ||
1da177e4 LT |
170 | static DEFINE_SPINLOCK(xfrm_state_gc_lock); |
171 | ||
53bc6b4d | 172 | int __xfrm_state_delete(struct xfrm_state *x); |
1da177e4 | 173 | |
980ebd25 | 174 | int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); |
53bc6b4d | 175 | void km_state_expired(struct xfrm_state *x, int hard, u32 pid); |
1da177e4 | 176 | |
aa5d62cc HX |
177 | static struct xfrm_state_afinfo *xfrm_state_lock_afinfo(unsigned int family) |
178 | { | |
179 | struct xfrm_state_afinfo *afinfo; | |
180 | if (unlikely(family >= NPROTO)) | |
181 | return NULL; | |
182 | write_lock_bh(&xfrm_state_afinfo_lock); | |
183 | afinfo = xfrm_state_afinfo[family]; | |
184 | if (unlikely(!afinfo)) | |
185 | write_unlock_bh(&xfrm_state_afinfo_lock); | |
186 | return afinfo; | |
187 | } | |
188 | ||
189 | static void xfrm_state_unlock_afinfo(struct xfrm_state_afinfo *afinfo) | |
9a429c49 | 190 | __releases(xfrm_state_afinfo_lock) |
aa5d62cc HX |
191 | { |
192 | write_unlock_bh(&xfrm_state_afinfo_lock); | |
193 | } | |
194 | ||
533cb5b0 | 195 | int xfrm_register_type(const struct xfrm_type *type, unsigned short family) |
aa5d62cc HX |
196 | { |
197 | struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family); | |
533cb5b0 | 198 | const struct xfrm_type **typemap; |
aa5d62cc HX |
199 | int err = 0; |
200 | ||
201 | if (unlikely(afinfo == NULL)) | |
202 | return -EAFNOSUPPORT; | |
203 | typemap = afinfo->type_map; | |
204 | ||
205 | if (likely(typemap[type->proto] == NULL)) | |
206 | typemap[type->proto] = type; | |
207 | else | |
208 | err = -EEXIST; | |
209 | xfrm_state_unlock_afinfo(afinfo); | |
210 | return err; | |
211 | } | |
212 | EXPORT_SYMBOL(xfrm_register_type); | |
213 | ||
533cb5b0 | 214 | int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family) |
aa5d62cc HX |
215 | { |
216 | struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family); | |
533cb5b0 | 217 | const struct xfrm_type **typemap; |
aa5d62cc HX |
218 | int err = 0; |
219 | ||
220 | if (unlikely(afinfo == NULL)) | |
221 | return -EAFNOSUPPORT; | |
222 | typemap = afinfo->type_map; | |
223 | ||
224 | if (unlikely(typemap[type->proto] != type)) | |
225 | err = -ENOENT; | |
226 | else | |
227 | typemap[type->proto] = NULL; | |
228 | xfrm_state_unlock_afinfo(afinfo); | |
229 | return err; | |
230 | } | |
231 | EXPORT_SYMBOL(xfrm_unregister_type); | |
232 | ||
533cb5b0 | 233 | static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family) |
aa5d62cc HX |
234 | { |
235 | struct xfrm_state_afinfo *afinfo; | |
533cb5b0 ED |
236 | const struct xfrm_type **typemap; |
237 | const struct xfrm_type *type; | |
aa5d62cc HX |
238 | int modload_attempted = 0; |
239 | ||
240 | retry: | |
241 | afinfo = xfrm_state_get_afinfo(family); | |
242 | if (unlikely(afinfo == NULL)) | |
243 | return NULL; | |
244 | typemap = afinfo->type_map; | |
245 | ||
246 | type = typemap[proto]; | |
247 | if (unlikely(type && !try_module_get(type->owner))) | |
248 | type = NULL; | |
249 | if (!type && !modload_attempted) { | |
250 | xfrm_state_put_afinfo(afinfo); | |
251 | request_module("xfrm-type-%d-%d", family, proto); | |
252 | modload_attempted = 1; | |
253 | goto retry; | |
254 | } | |
255 | ||
256 | xfrm_state_put_afinfo(afinfo); | |
257 | return type; | |
258 | } | |
259 | ||
533cb5b0 | 260 | static void xfrm_put_type(const struct xfrm_type *type) |
aa5d62cc HX |
261 | { |
262 | module_put(type->owner); | |
263 | } | |
264 | ||
265 | int xfrm_register_mode(struct xfrm_mode *mode, int family) | |
266 | { | |
267 | struct xfrm_state_afinfo *afinfo; | |
268 | struct xfrm_mode **modemap; | |
269 | int err; | |
270 | ||
271 | if (unlikely(mode->encap >= XFRM_MODE_MAX)) | |
272 | return -EINVAL; | |
273 | ||
274 | afinfo = xfrm_state_lock_afinfo(family); | |
275 | if (unlikely(afinfo == NULL)) | |
276 | return -EAFNOSUPPORT; | |
277 | ||
278 | err = -EEXIST; | |
279 | modemap = afinfo->mode_map; | |
17c2a42a HX |
280 | if (modemap[mode->encap]) |
281 | goto out; | |
aa5d62cc | 282 | |
17c2a42a HX |
283 | err = -ENOENT; |
284 | if (!try_module_get(afinfo->owner)) | |
285 | goto out; | |
286 | ||
287 | mode->afinfo = afinfo; | |
288 | modemap[mode->encap] = mode; | |
289 | err = 0; | |
290 | ||
291 | out: | |
aa5d62cc HX |
292 | xfrm_state_unlock_afinfo(afinfo); |
293 | return err; | |
294 | } | |
295 | EXPORT_SYMBOL(xfrm_register_mode); | |
296 | ||
297 | int xfrm_unregister_mode(struct xfrm_mode *mode, int family) | |
298 | { | |
299 | struct xfrm_state_afinfo *afinfo; | |
300 | struct xfrm_mode **modemap; | |
301 | int err; | |
302 | ||
303 | if (unlikely(mode->encap >= XFRM_MODE_MAX)) | |
304 | return -EINVAL; | |
305 | ||
306 | afinfo = xfrm_state_lock_afinfo(family); | |
307 | if (unlikely(afinfo == NULL)) | |
308 | return -EAFNOSUPPORT; | |
309 | ||
310 | err = -ENOENT; | |
311 | modemap = afinfo->mode_map; | |
312 | if (likely(modemap[mode->encap] == mode)) { | |
313 | modemap[mode->encap] = NULL; | |
17c2a42a | 314 | module_put(mode->afinfo->owner); |
aa5d62cc HX |
315 | err = 0; |
316 | } | |
317 | ||
318 | xfrm_state_unlock_afinfo(afinfo); | |
319 | return err; | |
320 | } | |
321 | EXPORT_SYMBOL(xfrm_unregister_mode); | |
322 | ||
323 | static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family) | |
324 | { | |
325 | struct xfrm_state_afinfo *afinfo; | |
326 | struct xfrm_mode *mode; | |
327 | int modload_attempted = 0; | |
328 | ||
329 | if (unlikely(encap >= XFRM_MODE_MAX)) | |
330 | return NULL; | |
331 | ||
332 | retry: | |
333 | afinfo = xfrm_state_get_afinfo(family); | |
334 | if (unlikely(afinfo == NULL)) | |
335 | return NULL; | |
336 | ||
337 | mode = afinfo->mode_map[encap]; | |
338 | if (unlikely(mode && !try_module_get(mode->owner))) | |
339 | mode = NULL; | |
340 | if (!mode && !modload_attempted) { | |
341 | xfrm_state_put_afinfo(afinfo); | |
342 | request_module("xfrm-mode-%d-%d", family, encap); | |
343 | modload_attempted = 1; | |
344 | goto retry; | |
345 | } | |
346 | ||
347 | xfrm_state_put_afinfo(afinfo); | |
348 | return mode; | |
349 | } | |
350 | ||
351 | static void xfrm_put_mode(struct xfrm_mode *mode) | |
352 | { | |
353 | module_put(mode->owner); | |
354 | } | |
355 | ||
1da177e4 LT |
356 | static void xfrm_state_gc_destroy(struct xfrm_state *x) |
357 | { | |
9e0d57fd | 358 | tasklet_hrtimer_cancel(&x->mtimer); |
a47f0ce0 | 359 | del_timer_sync(&x->rtimer); |
a51482bd JJ |
360 | kfree(x->aalg); |
361 | kfree(x->ealg); | |
362 | kfree(x->calg); | |
363 | kfree(x->encap); | |
060f02a3 | 364 | kfree(x->coaddr); |
13996378 HX |
365 | if (x->inner_mode) |
366 | xfrm_put_mode(x->inner_mode); | |
df9dcb45 KM |
367 | if (x->inner_mode_iaf) |
368 | xfrm_put_mode(x->inner_mode_iaf); | |
13996378 HX |
369 | if (x->outer_mode) |
370 | xfrm_put_mode(x->outer_mode); | |
1da177e4 LT |
371 | if (x->type) { |
372 | x->type->destructor(x); | |
373 | xfrm_put_type(x->type); | |
374 | } | |
df71837d | 375 | security_xfrm_state_free(x); |
1da177e4 LT |
376 | kfree(x); |
377 | } | |
378 | ||
c7837144 | 379 | static void xfrm_state_gc_task(struct work_struct *work) |
1da177e4 | 380 | { |
c7837144 | 381 | struct net *net = container_of(work, struct net, xfrm.state_gc_work); |
12a169e7 HX |
382 | struct xfrm_state *x; |
383 | struct hlist_node *entry, *tmp; | |
384 | struct hlist_head gc_list; | |
1da177e4 | 385 | |
1da177e4 | 386 | spin_lock_bh(&xfrm_state_gc_lock); |
c7837144 | 387 | hlist_move_list(&net->xfrm.state_gc_list, &gc_list); |
1da177e4 LT |
388 | spin_unlock_bh(&xfrm_state_gc_lock); |
389 | ||
12a169e7 | 390 | hlist_for_each_entry_safe(x, entry, tmp, &gc_list, gclist) |
1da177e4 | 391 | xfrm_state_gc_destroy(x); |
8f126e37 | 392 | |
50a30657 | 393 | wake_up(&net->xfrm.km_waitq); |
1da177e4 LT |
394 | } |
395 | ||
396 | static inline unsigned long make_jiffies(long secs) | |
397 | { | |
398 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
399 | return MAX_SCHEDULE_TIMEOUT-1; | |
400 | else | |
a716c119 | 401 | return secs*HZ; |
1da177e4 LT |
402 | } |
403 | ||
9e0d57fd | 404 | static enum hrtimer_restart xfrm_timer_handler(struct hrtimer * me) |
1da177e4 | 405 | { |
9e0d57fd YP |
406 | struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer); |
407 | struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer); | |
98806f75 | 408 | struct net *net = xs_net(x); |
9d729f72 | 409 | unsigned long now = get_seconds(); |
1da177e4 LT |
410 | long next = LONG_MAX; |
411 | int warn = 0; | |
161a09e7 | 412 | int err = 0; |
1da177e4 LT |
413 | |
414 | spin_lock(&x->lock); | |
415 | if (x->km.state == XFRM_STATE_DEAD) | |
416 | goto out; | |
417 | if (x->km.state == XFRM_STATE_EXPIRED) | |
418 | goto expired; | |
419 | if (x->lft.hard_add_expires_seconds) { | |
420 | long tmo = x->lft.hard_add_expires_seconds + | |
421 | x->curlft.add_time - now; | |
422 | if (tmo <= 0) | |
423 | goto expired; | |
424 | if (tmo < next) | |
425 | next = tmo; | |
426 | } | |
427 | if (x->lft.hard_use_expires_seconds) { | |
428 | long tmo = x->lft.hard_use_expires_seconds + | |
429 | (x->curlft.use_time ? : now) - now; | |
430 | if (tmo <= 0) | |
431 | goto expired; | |
432 | if (tmo < next) | |
433 | next = tmo; | |
434 | } | |
435 | if (x->km.dying) | |
436 | goto resched; | |
437 | if (x->lft.soft_add_expires_seconds) { | |
438 | long tmo = x->lft.soft_add_expires_seconds + | |
439 | x->curlft.add_time - now; | |
440 | if (tmo <= 0) | |
441 | warn = 1; | |
442 | else if (tmo < next) | |
443 | next = tmo; | |
444 | } | |
445 | if (x->lft.soft_use_expires_seconds) { | |
446 | long tmo = x->lft.soft_use_expires_seconds + | |
447 | (x->curlft.use_time ? : now) - now; | |
448 | if (tmo <= 0) | |
449 | warn = 1; | |
450 | else if (tmo < next) | |
451 | next = tmo; | |
452 | } | |
453 | ||
4666faab | 454 | x->km.dying = warn; |
1da177e4 | 455 | if (warn) |
53bc6b4d | 456 | km_state_expired(x, 0, 0); |
1da177e4 | 457 | resched: |
9e0d57fd YP |
458 | if (next != LONG_MAX){ |
459 | tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL); | |
460 | } | |
a47f0ce0 | 461 | |
1da177e4 LT |
462 | goto out; |
463 | ||
464 | expired: | |
465 | if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) { | |
466 | x->km.state = XFRM_STATE_EXPIRED; | |
98806f75 | 467 | wake_up(&net->xfrm.km_waitq); |
1da177e4 LT |
468 | next = 2; |
469 | goto resched; | |
470 | } | |
161a09e7 JL |
471 | |
472 | err = __xfrm_state_delete(x); | |
473 | if (!err && x->id.spi) | |
53bc6b4d | 474 | km_state_expired(x, 1, 0); |
1da177e4 | 475 | |
ab5f5e8b | 476 | xfrm_audit_state_delete(x, err ? 0 : 1, |
2532386f EP |
477 | audit_get_loginuid(current), |
478 | audit_get_sessionid(current), 0); | |
161a09e7 | 479 | |
1da177e4 LT |
480 | out: |
481 | spin_unlock(&x->lock); | |
9e0d57fd | 482 | return HRTIMER_NORESTART; |
1da177e4 LT |
483 | } |
484 | ||
0ac84752 DM |
485 | static void xfrm_replay_timer_handler(unsigned long data); |
486 | ||
673c09be | 487 | struct xfrm_state *xfrm_state_alloc(struct net *net) |
1da177e4 LT |
488 | { |
489 | struct xfrm_state *x; | |
490 | ||
0da974f4 | 491 | x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC); |
1da177e4 LT |
492 | |
493 | if (x) { | |
673c09be | 494 | write_pnet(&x->xs_net, net); |
1da177e4 LT |
495 | atomic_set(&x->refcnt, 1); |
496 | atomic_set(&x->tunnel_users, 0); | |
12a169e7 | 497 | INIT_LIST_HEAD(&x->km.all); |
8f126e37 DM |
498 | INIT_HLIST_NODE(&x->bydst); |
499 | INIT_HLIST_NODE(&x->bysrc); | |
500 | INIT_HLIST_NODE(&x->byspi); | |
9e0d57fd | 501 | tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler, CLOCK_REALTIME, HRTIMER_MODE_ABS); |
b24b8a24 PE |
502 | setup_timer(&x->rtimer, xfrm_replay_timer_handler, |
503 | (unsigned long)x); | |
9d729f72 | 504 | x->curlft.add_time = get_seconds(); |
1da177e4 LT |
505 | x->lft.soft_byte_limit = XFRM_INF; |
506 | x->lft.soft_packet_limit = XFRM_INF; | |
507 | x->lft.hard_byte_limit = XFRM_INF; | |
508 | x->lft.hard_packet_limit = XFRM_INF; | |
f8cd5488 JHS |
509 | x->replay_maxage = 0; |
510 | x->replay_maxdiff = 0; | |
df9dcb45 KM |
511 | x->inner_mode = NULL; |
512 | x->inner_mode_iaf = NULL; | |
1da177e4 LT |
513 | spin_lock_init(&x->lock); |
514 | } | |
515 | return x; | |
516 | } | |
517 | EXPORT_SYMBOL(xfrm_state_alloc); | |
518 | ||
519 | void __xfrm_state_destroy(struct xfrm_state *x) | |
520 | { | |
98806f75 AD |
521 | struct net *net = xs_net(x); |
522 | ||
547b792c | 523 | WARN_ON(x->km.state != XFRM_STATE_DEAD); |
1da177e4 LT |
524 | |
525 | spin_lock_bh(&xfrm_state_gc_lock); | |
98806f75 | 526 | hlist_add_head(&x->gclist, &net->xfrm.state_gc_list); |
1da177e4 | 527 | spin_unlock_bh(&xfrm_state_gc_lock); |
98806f75 | 528 | schedule_work(&net->xfrm.state_gc_work); |
1da177e4 LT |
529 | } |
530 | EXPORT_SYMBOL(__xfrm_state_destroy); | |
531 | ||
53bc6b4d | 532 | int __xfrm_state_delete(struct xfrm_state *x) |
1da177e4 | 533 | { |
98806f75 | 534 | struct net *net = xs_net(x); |
26b15dad JHS |
535 | int err = -ESRCH; |
536 | ||
1da177e4 LT |
537 | if (x->km.state != XFRM_STATE_DEAD) { |
538 | x->km.state = XFRM_STATE_DEAD; | |
539 | spin_lock(&xfrm_state_lock); | |
12a169e7 | 540 | list_del(&x->km.all); |
8f126e37 | 541 | hlist_del(&x->bydst); |
8f126e37 | 542 | hlist_del(&x->bysrc); |
a47f0ce0 | 543 | if (x->id.spi) |
8f126e37 | 544 | hlist_del(&x->byspi); |
98806f75 | 545 | net->xfrm.state_num--; |
1da177e4 | 546 | spin_unlock(&xfrm_state_lock); |
1da177e4 | 547 | |
1da177e4 LT |
548 | /* All xfrm_state objects are created by xfrm_state_alloc. |
549 | * The xfrm_state_alloc call gives a reference, and that | |
550 | * is what we are dropping here. | |
551 | */ | |
5dba4797 | 552 | xfrm_state_put(x); |
26b15dad | 553 | err = 0; |
1da177e4 | 554 | } |
26b15dad JHS |
555 | |
556 | return err; | |
1da177e4 | 557 | } |
53bc6b4d | 558 | EXPORT_SYMBOL(__xfrm_state_delete); |
1da177e4 | 559 | |
26b15dad | 560 | int xfrm_state_delete(struct xfrm_state *x) |
1da177e4 | 561 | { |
26b15dad JHS |
562 | int err; |
563 | ||
1da177e4 | 564 | spin_lock_bh(&x->lock); |
26b15dad | 565 | err = __xfrm_state_delete(x); |
1da177e4 | 566 | spin_unlock_bh(&x->lock); |
26b15dad JHS |
567 | |
568 | return err; | |
1da177e4 LT |
569 | } |
570 | EXPORT_SYMBOL(xfrm_state_delete); | |
571 | ||
4aa2e62c JL |
572 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
573 | static inline int | |
0e602451 | 574 | xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info) |
1da177e4 | 575 | { |
4aa2e62c JL |
576 | int i, err = 0; |
577 | ||
0e602451 | 578 | for (i = 0; i <= net->xfrm.state_hmask; i++) { |
4aa2e62c JL |
579 | struct hlist_node *entry; |
580 | struct xfrm_state *x; | |
581 | ||
0e602451 | 582 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) { |
4aa2e62c JL |
583 | if (xfrm_id_proto_match(x->id.proto, proto) && |
584 | (err = security_xfrm_state_delete(x)) != 0) { | |
ab5f5e8b JL |
585 | xfrm_audit_state_delete(x, 0, |
586 | audit_info->loginuid, | |
2532386f | 587 | audit_info->sessionid, |
ab5f5e8b | 588 | audit_info->secid); |
4aa2e62c JL |
589 | return err; |
590 | } | |
591 | } | |
592 | } | |
593 | ||
594 | return err; | |
595 | } | |
596 | #else | |
597 | static inline int | |
0e602451 | 598 | xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info) |
4aa2e62c JL |
599 | { |
600 | return 0; | |
601 | } | |
602 | #endif | |
603 | ||
0e602451 | 604 | int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info) |
4aa2e62c JL |
605 | { |
606 | int i, err = 0; | |
1da177e4 LT |
607 | |
608 | spin_lock_bh(&xfrm_state_lock); | |
0e602451 | 609 | err = xfrm_state_flush_secctx_check(net, proto, audit_info); |
4aa2e62c JL |
610 | if (err) |
611 | goto out; | |
612 | ||
0e602451 | 613 | for (i = 0; i <= net->xfrm.state_hmask; i++) { |
8f126e37 DM |
614 | struct hlist_node *entry; |
615 | struct xfrm_state *x; | |
1da177e4 | 616 | restart: |
0e602451 | 617 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) { |
1da177e4 | 618 | if (!xfrm_state_kern(x) && |
5794708f | 619 | xfrm_id_proto_match(x->id.proto, proto)) { |
1da177e4 LT |
620 | xfrm_state_hold(x); |
621 | spin_unlock_bh(&xfrm_state_lock); | |
622 | ||
161a09e7 | 623 | err = xfrm_state_delete(x); |
ab5f5e8b JL |
624 | xfrm_audit_state_delete(x, err ? 0 : 1, |
625 | audit_info->loginuid, | |
2532386f | 626 | audit_info->sessionid, |
ab5f5e8b | 627 | audit_info->secid); |
1da177e4 LT |
628 | xfrm_state_put(x); |
629 | ||
630 | spin_lock_bh(&xfrm_state_lock); | |
631 | goto restart; | |
632 | } | |
633 | } | |
634 | } | |
4aa2e62c JL |
635 | err = 0; |
636 | ||
637 | out: | |
1da177e4 | 638 | spin_unlock_bh(&xfrm_state_lock); |
0e602451 | 639 | wake_up(&net->xfrm.km_waitq); |
4aa2e62c | 640 | return err; |
1da177e4 LT |
641 | } |
642 | EXPORT_SYMBOL(xfrm_state_flush); | |
643 | ||
e071041b | 644 | void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si) |
28d8909b JHS |
645 | { |
646 | spin_lock_bh(&xfrm_state_lock); | |
e071041b AD |
647 | si->sadcnt = net->xfrm.state_num; |
648 | si->sadhcnt = net->xfrm.state_hmask; | |
28d8909b JHS |
649 | si->sadhmcnt = xfrm_state_hashmax; |
650 | spin_unlock_bh(&xfrm_state_lock); | |
651 | } | |
652 | EXPORT_SYMBOL(xfrm_sad_getinfo); | |
653 | ||
1da177e4 LT |
654 | static int |
655 | xfrm_init_tempsel(struct xfrm_state *x, struct flowi *fl, | |
656 | struct xfrm_tmpl *tmpl, | |
657 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
658 | unsigned short family) | |
659 | { | |
660 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
661 | if (!afinfo) | |
662 | return -1; | |
663 | afinfo->init_tempsel(x, fl, tmpl, daddr, saddr); | |
664 | xfrm_state_put_afinfo(afinfo); | |
665 | return 0; | |
666 | } | |
667 | ||
221df1ed | 668 | static struct xfrm_state *__xfrm_state_lookup(struct net *net, xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family) |
edcd5821 | 669 | { |
221df1ed | 670 | unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family); |
edcd5821 | 671 | struct xfrm_state *x; |
8f126e37 | 672 | struct hlist_node *entry; |
edcd5821 | 673 | |
221df1ed | 674 | hlist_for_each_entry(x, entry, net->xfrm.state_byspi+h, byspi) { |
edcd5821 DM |
675 | if (x->props.family != family || |
676 | x->id.spi != spi || | |
1802571b WY |
677 | x->id.proto != proto || |
678 | xfrm_addr_cmp(&x->id.daddr, daddr, family)) | |
edcd5821 DM |
679 | continue; |
680 | ||
edcd5821 DM |
681 | xfrm_state_hold(x); |
682 | return x; | |
683 | } | |
684 | ||
685 | return NULL; | |
686 | } | |
687 | ||
221df1ed | 688 | static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family) |
edcd5821 | 689 | { |
221df1ed | 690 | unsigned int h = xfrm_src_hash(net, daddr, saddr, family); |
edcd5821 | 691 | struct xfrm_state *x; |
8f126e37 | 692 | struct hlist_node *entry; |
edcd5821 | 693 | |
221df1ed | 694 | hlist_for_each_entry(x, entry, net->xfrm.state_bysrc+h, bysrc) { |
edcd5821 | 695 | if (x->props.family != family || |
1802571b WY |
696 | x->id.proto != proto || |
697 | xfrm_addr_cmp(&x->id.daddr, daddr, family) || | |
698 | xfrm_addr_cmp(&x->props.saddr, saddr, family)) | |
edcd5821 DM |
699 | continue; |
700 | ||
edcd5821 DM |
701 | xfrm_state_hold(x); |
702 | return x; | |
703 | } | |
704 | ||
705 | return NULL; | |
706 | } | |
707 | ||
708 | static inline struct xfrm_state * | |
709 | __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family) | |
710 | { | |
221df1ed AD |
711 | struct net *net = xs_net(x); |
712 | ||
edcd5821 | 713 | if (use_spi) |
221df1ed | 714 | return __xfrm_state_lookup(net, &x->id.daddr, x->id.spi, |
edcd5821 DM |
715 | x->id.proto, family); |
716 | else | |
221df1ed | 717 | return __xfrm_state_lookup_byaddr(net, &x->id.daddr, |
edcd5821 DM |
718 | &x->props.saddr, |
719 | x->id.proto, family); | |
720 | } | |
721 | ||
98806f75 | 722 | static void xfrm_hash_grow_check(struct net *net, int have_hash_collision) |
2fab22f2 PM |
723 | { |
724 | if (have_hash_collision && | |
98806f75 AD |
725 | (net->xfrm.state_hmask + 1) < xfrm_state_hashmax && |
726 | net->xfrm.state_num > net->xfrm.state_hmask) | |
727 | schedule_work(&net->xfrm.state_hash_work); | |
2fab22f2 PM |
728 | } |
729 | ||
08ec9af1 DM |
730 | static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x, |
731 | struct flowi *fl, unsigned short family, | |
732 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
733 | struct xfrm_state **best, int *acq_in_progress, | |
734 | int *error) | |
735 | { | |
736 | /* Resolution logic: | |
737 | * 1. There is a valid state with matching selector. Done. | |
738 | * 2. Valid state with inappropriate selector. Skip. | |
739 | * | |
740 | * Entering area of "sysdeps". | |
741 | * | |
742 | * 3. If state is not valid, selector is temporary, it selects | |
743 | * only session which triggered previous resolution. Key | |
744 | * manager will do something to install a state with proper | |
745 | * selector. | |
746 | */ | |
747 | if (x->km.state == XFRM_STATE_VALID) { | |
748 | if ((x->sel.family && | |
749 | !xfrm_selector_match(&x->sel, fl, x->sel.family)) || | |
750 | !security_xfrm_state_pol_flow_match(x, pol, fl)) | |
751 | return; | |
752 | ||
753 | if (!*best || | |
754 | (*best)->km.dying > x->km.dying || | |
755 | ((*best)->km.dying == x->km.dying && | |
756 | (*best)->curlft.add_time < x->curlft.add_time)) | |
757 | *best = x; | |
758 | } else if (x->km.state == XFRM_STATE_ACQ) { | |
759 | *acq_in_progress = 1; | |
760 | } else if (x->km.state == XFRM_STATE_ERROR || | |
761 | x->km.state == XFRM_STATE_EXPIRED) { | |
762 | if (xfrm_selector_match(&x->sel, fl, x->sel.family) && | |
763 | security_xfrm_state_pol_flow_match(x, pol, fl)) | |
764 | *error = -ESRCH; | |
765 | } | |
766 | } | |
767 | ||
1da177e4 | 768 | struct xfrm_state * |
a716c119 | 769 | xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, |
1da177e4 LT |
770 | struct flowi *fl, struct xfrm_tmpl *tmpl, |
771 | struct xfrm_policy *pol, int *err, | |
772 | unsigned short family) | |
773 | { | |
08ec9af1 | 774 | static xfrm_address_t saddr_wildcard = { }; |
5447c5e4 | 775 | struct net *net = xp_net(pol); |
6a783c90 | 776 | unsigned int h, h_wildcard; |
8f126e37 | 777 | struct hlist_node *entry; |
37b08e34 | 778 | struct xfrm_state *x, *x0, *to_put; |
1da177e4 LT |
779 | int acquire_in_progress = 0; |
780 | int error = 0; | |
781 | struct xfrm_state *best = NULL; | |
a716c119 | 782 | |
37b08e34 DM |
783 | to_put = NULL; |
784 | ||
1da177e4 | 785 | spin_lock_bh(&xfrm_state_lock); |
5447c5e4 AD |
786 | h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, family); |
787 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) { | |
1da177e4 LT |
788 | if (x->props.family == family && |
789 | x->props.reqid == tmpl->reqid && | |
fbd9a5b4 | 790 | !(x->props.flags & XFRM_STATE_WILDRECV) && |
1da177e4 LT |
791 | xfrm_state_addr_check(x, daddr, saddr, family) && |
792 | tmpl->mode == x->props.mode && | |
793 | tmpl->id.proto == x->id.proto && | |
08ec9af1 DM |
794 | (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) |
795 | xfrm_state_look_at(pol, x, fl, family, daddr, saddr, | |
796 | &best, &acquire_in_progress, &error); | |
797 | } | |
798 | if (best) | |
799 | goto found; | |
800 | ||
6a783c90 ND |
801 | h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, family); |
802 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h_wildcard, bydst) { | |
08ec9af1 DM |
803 | if (x->props.family == family && |
804 | x->props.reqid == tmpl->reqid && | |
805 | !(x->props.flags & XFRM_STATE_WILDRECV) && | |
806 | xfrm_state_addr_check(x, daddr, saddr, family) && | |
807 | tmpl->mode == x->props.mode && | |
808 | tmpl->id.proto == x->id.proto && | |
809 | (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) | |
810 | xfrm_state_look_at(pol, x, fl, family, daddr, saddr, | |
811 | &best, &acquire_in_progress, &error); | |
1da177e4 LT |
812 | } |
813 | ||
08ec9af1 | 814 | found: |
1da177e4 LT |
815 | x = best; |
816 | if (!x && !error && !acquire_in_progress) { | |
5c5d281a | 817 | if (tmpl->id.spi && |
5447c5e4 | 818 | (x0 = __xfrm_state_lookup(net, daddr, tmpl->id.spi, |
edcd5821 | 819 | tmpl->id.proto, family)) != NULL) { |
37b08e34 | 820 | to_put = x0; |
1da177e4 LT |
821 | error = -EEXIST; |
822 | goto out; | |
823 | } | |
5447c5e4 | 824 | x = xfrm_state_alloc(net); |
1da177e4 LT |
825 | if (x == NULL) { |
826 | error = -ENOMEM; | |
827 | goto out; | |
828 | } | |
829 | /* Initialize temporary selector matching only | |
830 | * to current session. */ | |
831 | xfrm_init_tempsel(x, fl, tmpl, daddr, saddr, family); | |
832 | ||
e0d1caa7 VY |
833 | error = security_xfrm_state_alloc_acquire(x, pol->security, fl->secid); |
834 | if (error) { | |
835 | x->km.state = XFRM_STATE_DEAD; | |
37b08e34 | 836 | to_put = x; |
e0d1caa7 VY |
837 | x = NULL; |
838 | goto out; | |
839 | } | |
840 | ||
1da177e4 LT |
841 | if (km_query(x, tmpl, pol) == 0) { |
842 | x->km.state = XFRM_STATE_ACQ; | |
5447c5e4 AD |
843 | list_add(&x->km.all, &net->xfrm.state_all); |
844 | hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); | |
845 | h = xfrm_src_hash(net, daddr, saddr, family); | |
846 | hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); | |
1da177e4 | 847 | if (x->id.spi) { |
5447c5e4 AD |
848 | h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, family); |
849 | hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); | |
1da177e4 | 850 | } |
b27aeadb | 851 | x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; |
9e0d57fd | 852 | tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL); |
5447c5e4 AD |
853 | net->xfrm.state_num++; |
854 | xfrm_hash_grow_check(net, x->bydst.next != NULL); | |
1da177e4 LT |
855 | } else { |
856 | x->km.state = XFRM_STATE_DEAD; | |
37b08e34 | 857 | to_put = x; |
1da177e4 LT |
858 | x = NULL; |
859 | error = -ESRCH; | |
860 | } | |
861 | } | |
862 | out: | |
863 | if (x) | |
864 | xfrm_state_hold(x); | |
865 | else | |
866 | *err = acquire_in_progress ? -EAGAIN : error; | |
867 | spin_unlock_bh(&xfrm_state_lock); | |
37b08e34 DM |
868 | if (to_put) |
869 | xfrm_state_put(to_put); | |
1da177e4 LT |
870 | return x; |
871 | } | |
872 | ||
628529b6 | 873 | struct xfrm_state * |
5447c5e4 AD |
874 | xfrm_stateonly_find(struct net *net, |
875 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
628529b6 JHS |
876 | unsigned short family, u8 mode, u8 proto, u32 reqid) |
877 | { | |
4bda4f25 | 878 | unsigned int h; |
628529b6 JHS |
879 | struct xfrm_state *rx = NULL, *x = NULL; |
880 | struct hlist_node *entry; | |
881 | ||
882 | spin_lock(&xfrm_state_lock); | |
5447c5e4 AD |
883 | h = xfrm_dst_hash(net, daddr, saddr, reqid, family); |
884 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) { | |
628529b6 JHS |
885 | if (x->props.family == family && |
886 | x->props.reqid == reqid && | |
887 | !(x->props.flags & XFRM_STATE_WILDRECV) && | |
888 | xfrm_state_addr_check(x, daddr, saddr, family) && | |
889 | mode == x->props.mode && | |
890 | proto == x->id.proto && | |
891 | x->km.state == XFRM_STATE_VALID) { | |
892 | rx = x; | |
893 | break; | |
894 | } | |
895 | } | |
896 | ||
897 | if (rx) | |
898 | xfrm_state_hold(rx); | |
899 | spin_unlock(&xfrm_state_lock); | |
900 | ||
901 | ||
902 | return rx; | |
903 | } | |
904 | EXPORT_SYMBOL(xfrm_stateonly_find); | |
905 | ||
1da177e4 LT |
906 | static void __xfrm_state_insert(struct xfrm_state *x) |
907 | { | |
98806f75 | 908 | struct net *net = xs_net(x); |
a624c108 | 909 | unsigned int h; |
1da177e4 | 910 | |
9d4a706d DM |
911 | x->genid = ++xfrm_state_genid; |
912 | ||
98806f75 | 913 | list_add(&x->km.all, &net->xfrm.state_all); |
4c563f76 | 914 | |
98806f75 | 915 | h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr, |
c1969f29 | 916 | x->props.reqid, x->props.family); |
98806f75 | 917 | hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); |
1da177e4 | 918 | |
98806f75 AD |
919 | h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family); |
920 | hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); | |
1da177e4 | 921 | |
7b4dc360 | 922 | if (x->id.spi) { |
98806f75 | 923 | h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, |
6c44e6b7 MN |
924 | x->props.family); |
925 | ||
98806f75 | 926 | hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); |
6c44e6b7 MN |
927 | } |
928 | ||
9e0d57fd | 929 | tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL); |
a47f0ce0 DM |
930 | if (x->replay_maxage) |
931 | mod_timer(&x->rtimer, jiffies + x->replay_maxage); | |
f8cd5488 | 932 | |
98806f75 | 933 | wake_up(&net->xfrm.km_waitq); |
f034b5d4 | 934 | |
98806f75 | 935 | net->xfrm.state_num++; |
f034b5d4 | 936 | |
98806f75 | 937 | xfrm_hash_grow_check(net, x->bydst.next != NULL); |
1da177e4 LT |
938 | } |
939 | ||
c7f5ea3a DM |
940 | /* xfrm_state_lock is held */ |
941 | static void __xfrm_state_bump_genids(struct xfrm_state *xnew) | |
942 | { | |
98806f75 | 943 | struct net *net = xs_net(xnew); |
c7f5ea3a DM |
944 | unsigned short family = xnew->props.family; |
945 | u32 reqid = xnew->props.reqid; | |
946 | struct xfrm_state *x; | |
947 | struct hlist_node *entry; | |
948 | unsigned int h; | |
949 | ||
98806f75 AD |
950 | h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family); |
951 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) { | |
c7f5ea3a DM |
952 | if (x->props.family == family && |
953 | x->props.reqid == reqid && | |
c1969f29 DM |
954 | !xfrm_addr_cmp(&x->id.daddr, &xnew->id.daddr, family) && |
955 | !xfrm_addr_cmp(&x->props.saddr, &xnew->props.saddr, family)) | |
c7f5ea3a DM |
956 | x->genid = xfrm_state_genid; |
957 | } | |
958 | } | |
959 | ||
1da177e4 LT |
960 | void xfrm_state_insert(struct xfrm_state *x) |
961 | { | |
962 | spin_lock_bh(&xfrm_state_lock); | |
c7f5ea3a | 963 | __xfrm_state_bump_genids(x); |
1da177e4 LT |
964 | __xfrm_state_insert(x); |
965 | spin_unlock_bh(&xfrm_state_lock); | |
966 | } | |
967 | EXPORT_SYMBOL(xfrm_state_insert); | |
968 | ||
2770834c | 969 | /* xfrm_state_lock is held */ |
5447c5e4 | 970 | static struct xfrm_state *__find_acq_core(struct net *net, unsigned short family, u8 mode, u32 reqid, u8 proto, xfrm_address_t *daddr, xfrm_address_t *saddr, int create) |
2770834c | 971 | { |
5447c5e4 | 972 | unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family); |
8f126e37 | 973 | struct hlist_node *entry; |
2770834c DM |
974 | struct xfrm_state *x; |
975 | ||
5447c5e4 | 976 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) { |
2770834c DM |
977 | if (x->props.reqid != reqid || |
978 | x->props.mode != mode || | |
979 | x->props.family != family || | |
980 | x->km.state != XFRM_STATE_ACQ || | |
75e252d9 | 981 | x->id.spi != 0 || |
1802571b WY |
982 | x->id.proto != proto || |
983 | xfrm_addr_cmp(&x->id.daddr, daddr, family) || | |
984 | xfrm_addr_cmp(&x->props.saddr, saddr, family)) | |
2770834c DM |
985 | continue; |
986 | ||
2770834c DM |
987 | xfrm_state_hold(x); |
988 | return x; | |
989 | } | |
990 | ||
991 | if (!create) | |
992 | return NULL; | |
993 | ||
5447c5e4 | 994 | x = xfrm_state_alloc(net); |
2770834c DM |
995 | if (likely(x)) { |
996 | switch (family) { | |
997 | case AF_INET: | |
998 | x->sel.daddr.a4 = daddr->a4; | |
999 | x->sel.saddr.a4 = saddr->a4; | |
1000 | x->sel.prefixlen_d = 32; | |
1001 | x->sel.prefixlen_s = 32; | |
1002 | x->props.saddr.a4 = saddr->a4; | |
1003 | x->id.daddr.a4 = daddr->a4; | |
1004 | break; | |
1005 | ||
1006 | case AF_INET6: | |
1007 | ipv6_addr_copy((struct in6_addr *)x->sel.daddr.a6, | |
1008 | (struct in6_addr *)daddr); | |
1009 | ipv6_addr_copy((struct in6_addr *)x->sel.saddr.a6, | |
1010 | (struct in6_addr *)saddr); | |
1011 | x->sel.prefixlen_d = 128; | |
1012 | x->sel.prefixlen_s = 128; | |
1013 | ipv6_addr_copy((struct in6_addr *)x->props.saddr.a6, | |
1014 | (struct in6_addr *)saddr); | |
1015 | ipv6_addr_copy((struct in6_addr *)x->id.daddr.a6, | |
1016 | (struct in6_addr *)daddr); | |
1017 | break; | |
3ff50b79 | 1018 | } |
2770834c DM |
1019 | |
1020 | x->km.state = XFRM_STATE_ACQ; | |
1021 | x->id.proto = proto; | |
1022 | x->props.family = family; | |
1023 | x->props.mode = mode; | |
1024 | x->props.reqid = reqid; | |
b27aeadb | 1025 | x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; |
2770834c | 1026 | xfrm_state_hold(x); |
9e0d57fd | 1027 | tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL); |
5447c5e4 AD |
1028 | list_add(&x->km.all, &net->xfrm.state_all); |
1029 | hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); | |
1030 | h = xfrm_src_hash(net, daddr, saddr, family); | |
1031 | hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); | |
918049f0 | 1032 | |
5447c5e4 | 1033 | net->xfrm.state_num++; |
918049f0 | 1034 | |
5447c5e4 | 1035 | xfrm_hash_grow_check(net, x->bydst.next != NULL); |
2770834c DM |
1036 | } |
1037 | ||
1038 | return x; | |
1039 | } | |
1040 | ||
5447c5e4 | 1041 | static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 seq); |
1da177e4 LT |
1042 | |
1043 | int xfrm_state_add(struct xfrm_state *x) | |
1044 | { | |
5447c5e4 | 1045 | struct net *net = xs_net(x); |
37b08e34 | 1046 | struct xfrm_state *x1, *to_put; |
1da177e4 LT |
1047 | int family; |
1048 | int err; | |
eb2971b6 | 1049 | int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); |
1da177e4 LT |
1050 | |
1051 | family = x->props.family; | |
1da177e4 | 1052 | |
37b08e34 DM |
1053 | to_put = NULL; |
1054 | ||
1da177e4 LT |
1055 | spin_lock_bh(&xfrm_state_lock); |
1056 | ||
edcd5821 | 1057 | x1 = __xfrm_state_locate(x, use_spi, family); |
1da177e4 | 1058 | if (x1) { |
37b08e34 | 1059 | to_put = x1; |
1da177e4 LT |
1060 | x1 = NULL; |
1061 | err = -EEXIST; | |
1062 | goto out; | |
1063 | } | |
1064 | ||
eb2971b6 | 1065 | if (use_spi && x->km.seq) { |
5447c5e4 | 1066 | x1 = __xfrm_find_acq_byseq(net, x->km.seq); |
75e252d9 JL |
1067 | if (x1 && ((x1->id.proto != x->id.proto) || |
1068 | xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family))) { | |
37b08e34 | 1069 | to_put = x1; |
1da177e4 LT |
1070 | x1 = NULL; |
1071 | } | |
1072 | } | |
1073 | ||
eb2971b6 | 1074 | if (use_spi && !x1) |
5447c5e4 | 1075 | x1 = __find_acq_core(net, family, x->props.mode, x->props.reqid, |
2770834c DM |
1076 | x->id.proto, |
1077 | &x->id.daddr, &x->props.saddr, 0); | |
1da177e4 | 1078 | |
c7f5ea3a | 1079 | __xfrm_state_bump_genids(x); |
1da177e4 LT |
1080 | __xfrm_state_insert(x); |
1081 | err = 0; | |
1082 | ||
1083 | out: | |
1084 | spin_unlock_bh(&xfrm_state_lock); | |
1da177e4 LT |
1085 | |
1086 | if (x1) { | |
1087 | xfrm_state_delete(x1); | |
1088 | xfrm_state_put(x1); | |
1089 | } | |
1090 | ||
37b08e34 DM |
1091 | if (to_put) |
1092 | xfrm_state_put(to_put); | |
1093 | ||
1da177e4 LT |
1094 | return err; |
1095 | } | |
1096 | EXPORT_SYMBOL(xfrm_state_add); | |
1097 | ||
80c9abaa | 1098 | #ifdef CONFIG_XFRM_MIGRATE |
6666351d | 1099 | static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, int *errp) |
80c9abaa | 1100 | { |
98806f75 | 1101 | struct net *net = xs_net(orig); |
80c9abaa | 1102 | int err = -ENOMEM; |
98806f75 | 1103 | struct xfrm_state *x = xfrm_state_alloc(net); |
80c9abaa SS |
1104 | if (!x) |
1105 | goto error; | |
1106 | ||
1107 | memcpy(&x->id, &orig->id, sizeof(x->id)); | |
1108 | memcpy(&x->sel, &orig->sel, sizeof(x->sel)); | |
1109 | memcpy(&x->lft, &orig->lft, sizeof(x->lft)); | |
1110 | x->props.mode = orig->props.mode; | |
1111 | x->props.replay_window = orig->props.replay_window; | |
1112 | x->props.reqid = orig->props.reqid; | |
1113 | x->props.family = orig->props.family; | |
1114 | x->props.saddr = orig->props.saddr; | |
1115 | ||
1116 | if (orig->aalg) { | |
4447bb33 | 1117 | x->aalg = xfrm_algo_auth_clone(orig->aalg); |
80c9abaa SS |
1118 | if (!x->aalg) |
1119 | goto error; | |
1120 | } | |
1121 | x->props.aalgo = orig->props.aalgo; | |
1122 | ||
1123 | if (orig->ealg) { | |
1124 | x->ealg = xfrm_algo_clone(orig->ealg); | |
1125 | if (!x->ealg) | |
1126 | goto error; | |
1127 | } | |
1128 | x->props.ealgo = orig->props.ealgo; | |
1129 | ||
1130 | if (orig->calg) { | |
1131 | x->calg = xfrm_algo_clone(orig->calg); | |
1132 | if (!x->calg) | |
1133 | goto error; | |
1134 | } | |
1135 | x->props.calgo = orig->props.calgo; | |
1136 | ||
a716c119 | 1137 | if (orig->encap) { |
80c9abaa SS |
1138 | x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL); |
1139 | if (!x->encap) | |
1140 | goto error; | |
1141 | } | |
1142 | ||
1143 | if (orig->coaddr) { | |
1144 | x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr), | |
1145 | GFP_KERNEL); | |
1146 | if (!x->coaddr) | |
1147 | goto error; | |
1148 | } | |
1149 | ||
1150 | err = xfrm_init_state(x); | |
1151 | if (err) | |
1152 | goto error; | |
1153 | ||
1154 | x->props.flags = orig->props.flags; | |
1155 | ||
1156 | x->curlft.add_time = orig->curlft.add_time; | |
1157 | x->km.state = orig->km.state; | |
1158 | x->km.seq = orig->km.seq; | |
1159 | ||
1160 | return x; | |
1161 | ||
1162 | error: | |
1163 | if (errp) | |
1164 | *errp = err; | |
1165 | if (x) { | |
1166 | kfree(x->aalg); | |
1167 | kfree(x->ealg); | |
1168 | kfree(x->calg); | |
1169 | kfree(x->encap); | |
1170 | kfree(x->coaddr); | |
1171 | } | |
1172 | kfree(x); | |
1173 | return NULL; | |
1174 | } | |
80c9abaa SS |
1175 | |
1176 | /* xfrm_state_lock is held */ | |
1177 | struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m) | |
1178 | { | |
1179 | unsigned int h; | |
1180 | struct xfrm_state *x; | |
1181 | struct hlist_node *entry; | |
1182 | ||
1183 | if (m->reqid) { | |
64d0cd00 | 1184 | h = xfrm_dst_hash(&init_net, &m->old_daddr, &m->old_saddr, |
80c9abaa | 1185 | m->reqid, m->old_family); |
73d189dc | 1186 | hlist_for_each_entry(x, entry, init_net.xfrm.state_bydst+h, bydst) { |
80c9abaa SS |
1187 | if (x->props.mode != m->mode || |
1188 | x->id.proto != m->proto) | |
1189 | continue; | |
1190 | if (m->reqid && x->props.reqid != m->reqid) | |
1191 | continue; | |
1192 | if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr, | |
1193 | m->old_family) || | |
1194 | xfrm_addr_cmp(&x->props.saddr, &m->old_saddr, | |
1195 | m->old_family)) | |
1196 | continue; | |
1197 | xfrm_state_hold(x); | |
1198 | return x; | |
1199 | } | |
1200 | } else { | |
64d0cd00 | 1201 | h = xfrm_src_hash(&init_net, &m->old_daddr, &m->old_saddr, |
80c9abaa | 1202 | m->old_family); |
d320bbb3 | 1203 | hlist_for_each_entry(x, entry, init_net.xfrm.state_bysrc+h, bysrc) { |
80c9abaa SS |
1204 | if (x->props.mode != m->mode || |
1205 | x->id.proto != m->proto) | |
1206 | continue; | |
1207 | if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr, | |
1208 | m->old_family) || | |
1209 | xfrm_addr_cmp(&x->props.saddr, &m->old_saddr, | |
1210 | m->old_family)) | |
1211 | continue; | |
1212 | xfrm_state_hold(x); | |
1213 | return x; | |
1214 | } | |
1215 | } | |
1216 | ||
a716c119 | 1217 | return NULL; |
80c9abaa SS |
1218 | } |
1219 | EXPORT_SYMBOL(xfrm_migrate_state_find); | |
1220 | ||
1221 | struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x, | |
1222 | struct xfrm_migrate *m) | |
1223 | { | |
1224 | struct xfrm_state *xc; | |
1225 | int err; | |
1226 | ||
1227 | xc = xfrm_state_clone(x, &err); | |
1228 | if (!xc) | |
1229 | return NULL; | |
1230 | ||
1231 | memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr)); | |
1232 | memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr)); | |
1233 | ||
1234 | /* add state */ | |
1235 | if (!xfrm_addr_cmp(&x->id.daddr, &m->new_daddr, m->new_family)) { | |
1236 | /* a care is needed when the destination address of the | |
1237 | state is to be updated as it is a part of triplet */ | |
1238 | xfrm_state_insert(xc); | |
1239 | } else { | |
1240 | if ((err = xfrm_state_add(xc)) < 0) | |
1241 | goto error; | |
1242 | } | |
1243 | ||
1244 | return xc; | |
1245 | error: | |
1246 | kfree(xc); | |
1247 | return NULL; | |
1248 | } | |
1249 | EXPORT_SYMBOL(xfrm_state_migrate); | |
1250 | #endif | |
1251 | ||
1da177e4 LT |
1252 | int xfrm_state_update(struct xfrm_state *x) |
1253 | { | |
37b08e34 | 1254 | struct xfrm_state *x1, *to_put; |
1da177e4 | 1255 | int err; |
eb2971b6 | 1256 | int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); |
1da177e4 | 1257 | |
37b08e34 DM |
1258 | to_put = NULL; |
1259 | ||
1da177e4 | 1260 | spin_lock_bh(&xfrm_state_lock); |
edcd5821 | 1261 | x1 = __xfrm_state_locate(x, use_spi, x->props.family); |
1da177e4 LT |
1262 | |
1263 | err = -ESRCH; | |
1264 | if (!x1) | |
1265 | goto out; | |
1266 | ||
1267 | if (xfrm_state_kern(x1)) { | |
37b08e34 | 1268 | to_put = x1; |
1da177e4 LT |
1269 | err = -EEXIST; |
1270 | goto out; | |
1271 | } | |
1272 | ||
1273 | if (x1->km.state == XFRM_STATE_ACQ) { | |
1274 | __xfrm_state_insert(x); | |
1275 | x = NULL; | |
1276 | } | |
1277 | err = 0; | |
1278 | ||
1279 | out: | |
1280 | spin_unlock_bh(&xfrm_state_lock); | |
1da177e4 | 1281 | |
37b08e34 DM |
1282 | if (to_put) |
1283 | xfrm_state_put(to_put); | |
1284 | ||
1da177e4 LT |
1285 | if (err) |
1286 | return err; | |
1287 | ||
1288 | if (!x) { | |
1289 | xfrm_state_delete(x1); | |
1290 | xfrm_state_put(x1); | |
1291 | return 0; | |
1292 | } | |
1293 | ||
1294 | err = -EINVAL; | |
1295 | spin_lock_bh(&x1->lock); | |
1296 | if (likely(x1->km.state == XFRM_STATE_VALID)) { | |
1297 | if (x->encap && x1->encap) | |
1298 | memcpy(x1->encap, x->encap, sizeof(*x1->encap)); | |
060f02a3 NT |
1299 | if (x->coaddr && x1->coaddr) { |
1300 | memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr)); | |
1301 | } | |
1302 | if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel))) | |
1303 | memcpy(&x1->sel, &x->sel, sizeof(x1->sel)); | |
1da177e4 LT |
1304 | memcpy(&x1->lft, &x->lft, sizeof(x1->lft)); |
1305 | x1->km.dying = 0; | |
1306 | ||
9e0d57fd | 1307 | tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL); |
1da177e4 LT |
1308 | if (x1->curlft.use_time) |
1309 | xfrm_state_check_expire(x1); | |
1310 | ||
1311 | err = 0; | |
1312 | } | |
1313 | spin_unlock_bh(&x1->lock); | |
1314 | ||
1315 | xfrm_state_put(x1); | |
1316 | ||
1317 | return err; | |
1318 | } | |
1319 | EXPORT_SYMBOL(xfrm_state_update); | |
1320 | ||
1321 | int xfrm_state_check_expire(struct xfrm_state *x) | |
1322 | { | |
1323 | if (!x->curlft.use_time) | |
9d729f72 | 1324 | x->curlft.use_time = get_seconds(); |
1da177e4 LT |
1325 | |
1326 | if (x->km.state != XFRM_STATE_VALID) | |
1327 | return -EINVAL; | |
1328 | ||
1329 | if (x->curlft.bytes >= x->lft.hard_byte_limit || | |
1330 | x->curlft.packets >= x->lft.hard_packet_limit) { | |
4666faab | 1331 | x->km.state = XFRM_STATE_EXPIRED; |
9e0d57fd | 1332 | tasklet_hrtimer_start(&x->mtimer, ktime_set(0,0), HRTIMER_MODE_REL); |
1da177e4 LT |
1333 | return -EINVAL; |
1334 | } | |
1335 | ||
1336 | if (!x->km.dying && | |
1337 | (x->curlft.bytes >= x->lft.soft_byte_limit || | |
4666faab HX |
1338 | x->curlft.packets >= x->lft.soft_packet_limit)) { |
1339 | x->km.dying = 1; | |
53bc6b4d | 1340 | km_state_expired(x, 0, 0); |
4666faab | 1341 | } |
1da177e4 LT |
1342 | return 0; |
1343 | } | |
1344 | EXPORT_SYMBOL(xfrm_state_check_expire); | |
1345 | ||
1da177e4 | 1346 | struct xfrm_state * |
221df1ed | 1347 | xfrm_state_lookup(struct net *net, xfrm_address_t *daddr, __be32 spi, u8 proto, |
1da177e4 LT |
1348 | unsigned short family) |
1349 | { | |
1350 | struct xfrm_state *x; | |
1da177e4 LT |
1351 | |
1352 | spin_lock_bh(&xfrm_state_lock); | |
221df1ed | 1353 | x = __xfrm_state_lookup(net, daddr, spi, proto, family); |
1da177e4 | 1354 | spin_unlock_bh(&xfrm_state_lock); |
1da177e4 LT |
1355 | return x; |
1356 | } | |
1357 | EXPORT_SYMBOL(xfrm_state_lookup); | |
1358 | ||
1359 | struct xfrm_state * | |
221df1ed AD |
1360 | xfrm_state_lookup_byaddr(struct net *net, |
1361 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
eb2971b6 MN |
1362 | u8 proto, unsigned short family) |
1363 | { | |
1364 | struct xfrm_state *x; | |
eb2971b6 MN |
1365 | |
1366 | spin_lock_bh(&xfrm_state_lock); | |
221df1ed | 1367 | x = __xfrm_state_lookup_byaddr(net, daddr, saddr, proto, family); |
eb2971b6 | 1368 | spin_unlock_bh(&xfrm_state_lock); |
eb2971b6 MN |
1369 | return x; |
1370 | } | |
1371 | EXPORT_SYMBOL(xfrm_state_lookup_byaddr); | |
1372 | ||
1373 | struct xfrm_state * | |
5447c5e4 | 1374 | xfrm_find_acq(struct net *net, u8 mode, u32 reqid, u8 proto, |
a716c119 | 1375 | xfrm_address_t *daddr, xfrm_address_t *saddr, |
1da177e4 LT |
1376 | int create, unsigned short family) |
1377 | { | |
1378 | struct xfrm_state *x; | |
1da177e4 LT |
1379 | |
1380 | spin_lock_bh(&xfrm_state_lock); | |
5447c5e4 | 1381 | x = __find_acq_core(net, family, mode, reqid, proto, daddr, saddr, create); |
1da177e4 | 1382 | spin_unlock_bh(&xfrm_state_lock); |
2770834c | 1383 | |
1da177e4 LT |
1384 | return x; |
1385 | } | |
1386 | EXPORT_SYMBOL(xfrm_find_acq); | |
1387 | ||
41a49cc3 MN |
1388 | #ifdef CONFIG_XFRM_SUB_POLICY |
1389 | int | |
1390 | xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, | |
1391 | unsigned short family) | |
1392 | { | |
1393 | int err = 0; | |
1394 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
1395 | if (!afinfo) | |
1396 | return -EAFNOSUPPORT; | |
1397 | ||
1398 | spin_lock_bh(&xfrm_state_lock); | |
1399 | if (afinfo->tmpl_sort) | |
1400 | err = afinfo->tmpl_sort(dst, src, n); | |
1401 | spin_unlock_bh(&xfrm_state_lock); | |
1402 | xfrm_state_put_afinfo(afinfo); | |
1403 | return err; | |
1404 | } | |
1405 | EXPORT_SYMBOL(xfrm_tmpl_sort); | |
1406 | ||
1407 | int | |
1408 | xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, | |
1409 | unsigned short family) | |
1410 | { | |
1411 | int err = 0; | |
1412 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
1413 | if (!afinfo) | |
1414 | return -EAFNOSUPPORT; | |
1415 | ||
1416 | spin_lock_bh(&xfrm_state_lock); | |
1417 | if (afinfo->state_sort) | |
1418 | err = afinfo->state_sort(dst, src, n); | |
1419 | spin_unlock_bh(&xfrm_state_lock); | |
1420 | xfrm_state_put_afinfo(afinfo); | |
1421 | return err; | |
1422 | } | |
1423 | EXPORT_SYMBOL(xfrm_state_sort); | |
1424 | #endif | |
1425 | ||
1da177e4 LT |
1426 | /* Silly enough, but I'm lazy to build resolution list */ |
1427 | ||
5447c5e4 | 1428 | static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 seq) |
1da177e4 LT |
1429 | { |
1430 | int i; | |
1da177e4 | 1431 | |
5447c5e4 | 1432 | for (i = 0; i <= net->xfrm.state_hmask; i++) { |
8f126e37 DM |
1433 | struct hlist_node *entry; |
1434 | struct xfrm_state *x; | |
1435 | ||
5447c5e4 | 1436 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) { |
8f126e37 DM |
1437 | if (x->km.seq == seq && |
1438 | x->km.state == XFRM_STATE_ACQ) { | |
1da177e4 LT |
1439 | xfrm_state_hold(x); |
1440 | return x; | |
1441 | } | |
1442 | } | |
1443 | } | |
1444 | return NULL; | |
1445 | } | |
1446 | ||
5447c5e4 | 1447 | struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 seq) |
1da177e4 LT |
1448 | { |
1449 | struct xfrm_state *x; | |
1450 | ||
1451 | spin_lock_bh(&xfrm_state_lock); | |
5447c5e4 | 1452 | x = __xfrm_find_acq_byseq(net, seq); |
1da177e4 LT |
1453 | spin_unlock_bh(&xfrm_state_lock); |
1454 | return x; | |
1455 | } | |
1456 | EXPORT_SYMBOL(xfrm_find_acq_byseq); | |
1457 | ||
1458 | u32 xfrm_get_acqseq(void) | |
1459 | { | |
1460 | u32 res; | |
1461 | static u32 acqseq; | |
1462 | static DEFINE_SPINLOCK(acqseq_lock); | |
1463 | ||
1464 | spin_lock_bh(&acqseq_lock); | |
1465 | res = (++acqseq ? : ++acqseq); | |
1466 | spin_unlock_bh(&acqseq_lock); | |
1467 | return res; | |
1468 | } | |
1469 | EXPORT_SYMBOL(xfrm_get_acqseq); | |
1470 | ||
658b219e | 1471 | int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high) |
1da177e4 | 1472 | { |
221df1ed | 1473 | struct net *net = xs_net(x); |
f034b5d4 | 1474 | unsigned int h; |
1da177e4 | 1475 | struct xfrm_state *x0; |
658b219e HX |
1476 | int err = -ENOENT; |
1477 | __be32 minspi = htonl(low); | |
1478 | __be32 maxspi = htonl(high); | |
1da177e4 | 1479 | |
658b219e HX |
1480 | spin_lock_bh(&x->lock); |
1481 | if (x->km.state == XFRM_STATE_DEAD) | |
1482 | goto unlock; | |
1483 | ||
1484 | err = 0; | |
1da177e4 | 1485 | if (x->id.spi) |
658b219e HX |
1486 | goto unlock; |
1487 | ||
1488 | err = -ENOENT; | |
1da177e4 LT |
1489 | |
1490 | if (minspi == maxspi) { | |
221df1ed | 1491 | x0 = xfrm_state_lookup(net, &x->id.daddr, minspi, x->id.proto, x->props.family); |
1da177e4 LT |
1492 | if (x0) { |
1493 | xfrm_state_put(x0); | |
658b219e | 1494 | goto unlock; |
1da177e4 LT |
1495 | } |
1496 | x->id.spi = minspi; | |
1497 | } else { | |
1498 | u32 spi = 0; | |
26977b4e AV |
1499 | for (h=0; h<high-low+1; h++) { |
1500 | spi = low + net_random()%(high-low+1); | |
221df1ed | 1501 | x0 = xfrm_state_lookup(net, &x->id.daddr, htonl(spi), x->id.proto, x->props.family); |
1da177e4 LT |
1502 | if (x0 == NULL) { |
1503 | x->id.spi = htonl(spi); | |
1504 | break; | |
1505 | } | |
1506 | xfrm_state_put(x0); | |
1507 | } | |
1508 | } | |
1509 | if (x->id.spi) { | |
1510 | spin_lock_bh(&xfrm_state_lock); | |
12604d8a AD |
1511 | h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family); |
1512 | hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); | |
1da177e4 | 1513 | spin_unlock_bh(&xfrm_state_lock); |
658b219e HX |
1514 | |
1515 | err = 0; | |
1da177e4 | 1516 | } |
658b219e HX |
1517 | |
1518 | unlock: | |
1519 | spin_unlock_bh(&x->lock); | |
1520 | ||
1521 | return err; | |
1da177e4 LT |
1522 | } |
1523 | EXPORT_SYMBOL(xfrm_alloc_spi); | |
1524 | ||
284fa7da | 1525 | int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, |
4c563f76 | 1526 | int (*func)(struct xfrm_state *, int, void*), |
1da177e4 LT |
1527 | void *data) |
1528 | { | |
12a169e7 HX |
1529 | struct xfrm_state *state; |
1530 | struct xfrm_state_walk *x; | |
1da177e4 LT |
1531 | int err = 0; |
1532 | ||
12a169e7 | 1533 | if (walk->seq != 0 && list_empty(&walk->all)) |
4c563f76 TT |
1534 | return 0; |
1535 | ||
1da177e4 | 1536 | spin_lock_bh(&xfrm_state_lock); |
12a169e7 | 1537 | if (list_empty(&walk->all)) |
284fa7da | 1538 | x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all); |
12a169e7 HX |
1539 | else |
1540 | x = list_entry(&walk->all, struct xfrm_state_walk, all); | |
284fa7da | 1541 | list_for_each_entry_from(x, &net->xfrm.state_all, all) { |
12a169e7 | 1542 | if (x->state == XFRM_STATE_DEAD) |
4c563f76 | 1543 | continue; |
12a169e7 HX |
1544 | state = container_of(x, struct xfrm_state, km); |
1545 | if (!xfrm_id_proto_match(state->id.proto, walk->proto)) | |
4c563f76 | 1546 | continue; |
12a169e7 HX |
1547 | err = func(state, walk->seq, data); |
1548 | if (err) { | |
1549 | list_move_tail(&walk->all, &x->all); | |
1550 | goto out; | |
1da177e4 | 1551 | } |
12a169e7 | 1552 | walk->seq++; |
1da177e4 | 1553 | } |
12a169e7 | 1554 | if (walk->seq == 0) { |
1da177e4 LT |
1555 | err = -ENOENT; |
1556 | goto out; | |
1557 | } | |
12a169e7 | 1558 | list_del_init(&walk->all); |
1da177e4 LT |
1559 | out: |
1560 | spin_unlock_bh(&xfrm_state_lock); | |
1561 | return err; | |
1562 | } | |
1563 | EXPORT_SYMBOL(xfrm_state_walk); | |
1564 | ||
5c182458 HX |
1565 | void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto) |
1566 | { | |
12a169e7 | 1567 | INIT_LIST_HEAD(&walk->all); |
5c182458 | 1568 | walk->proto = proto; |
12a169e7 HX |
1569 | walk->state = XFRM_STATE_DEAD; |
1570 | walk->seq = 0; | |
5c182458 HX |
1571 | } |
1572 | EXPORT_SYMBOL(xfrm_state_walk_init); | |
1573 | ||
abb81c4f HX |
1574 | void xfrm_state_walk_done(struct xfrm_state_walk *walk) |
1575 | { | |
12a169e7 | 1576 | if (list_empty(&walk->all)) |
5c182458 | 1577 | return; |
5c182458 | 1578 | |
12a169e7 HX |
1579 | spin_lock_bh(&xfrm_state_lock); |
1580 | list_del(&walk->all); | |
7d0b591c | 1581 | spin_unlock_bh(&xfrm_state_lock); |
abb81c4f HX |
1582 | } |
1583 | EXPORT_SYMBOL(xfrm_state_walk_done); | |
1584 | ||
f8cd5488 JHS |
1585 | |
1586 | void xfrm_replay_notify(struct xfrm_state *x, int event) | |
1587 | { | |
1588 | struct km_event c; | |
1589 | /* we send notify messages in case | |
1590 | * 1. we updated on of the sequence numbers, and the seqno difference | |
1591 | * is at least x->replay_maxdiff, in this case we also update the | |
1592 | * timeout of our timer function | |
1593 | * 2. if x->replay_maxage has elapsed since last update, | |
1594 | * and there were changes | |
1595 | * | |
1596 | * The state structure must be locked! | |
1597 | */ | |
1598 | ||
1599 | switch (event) { | |
1600 | case XFRM_REPLAY_UPDATE: | |
1601 | if (x->replay_maxdiff && | |
1602 | (x->replay.seq - x->preplay.seq < x->replay_maxdiff) && | |
2717096a JHS |
1603 | (x->replay.oseq - x->preplay.oseq < x->replay_maxdiff)) { |
1604 | if (x->xflags & XFRM_TIME_DEFER) | |
1605 | event = XFRM_REPLAY_TIMEOUT; | |
1606 | else | |
1607 | return; | |
1608 | } | |
f8cd5488 JHS |
1609 | |
1610 | break; | |
1611 | ||
1612 | case XFRM_REPLAY_TIMEOUT: | |
1613 | if ((x->replay.seq == x->preplay.seq) && | |
1614 | (x->replay.bitmap == x->preplay.bitmap) && | |
2717096a JHS |
1615 | (x->replay.oseq == x->preplay.oseq)) { |
1616 | x->xflags |= XFRM_TIME_DEFER; | |
f8cd5488 | 1617 | return; |
2717096a | 1618 | } |
f8cd5488 JHS |
1619 | |
1620 | break; | |
1621 | } | |
1622 | ||
1623 | memcpy(&x->preplay, &x->replay, sizeof(struct xfrm_replay_state)); | |
1624 | c.event = XFRM_MSG_NEWAE; | |
1625 | c.data.aevent = event; | |
1626 | km_state_notify(x, &c); | |
1627 | ||
f8cd5488 | 1628 | if (x->replay_maxage && |
a47f0ce0 | 1629 | !mod_timer(&x->rtimer, jiffies + x->replay_maxage)) |
2717096a | 1630 | x->xflags &= ~XFRM_TIME_DEFER; |
f8cd5488 JHS |
1631 | } |
1632 | ||
1633 | static void xfrm_replay_timer_handler(unsigned long data) | |
1634 | { | |
1635 | struct xfrm_state *x = (struct xfrm_state*)data; | |
1636 | ||
1637 | spin_lock(&x->lock); | |
1638 | ||
2717096a | 1639 | if (x->km.state == XFRM_STATE_VALID) { |
a6483b79 | 1640 | if (xfrm_aevent_is_on(xs_net(x))) |
2717096a JHS |
1641 | xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT); |
1642 | else | |
1643 | x->xflags |= XFRM_TIME_DEFER; | |
1644 | } | |
f8cd5488 JHS |
1645 | |
1646 | spin_unlock(&x->lock); | |
1647 | } | |
1648 | ||
afeb14b4 PM |
1649 | int xfrm_replay_check(struct xfrm_state *x, |
1650 | struct sk_buff *skb, __be32 net_seq) | |
1da177e4 LT |
1651 | { |
1652 | u32 diff; | |
a252cc23 | 1653 | u32 seq = ntohl(net_seq); |
1da177e4 LT |
1654 | |
1655 | if (unlikely(seq == 0)) | |
afeb14b4 | 1656 | goto err; |
1da177e4 LT |
1657 | |
1658 | if (likely(seq > x->replay.seq)) | |
1659 | return 0; | |
1660 | ||
1661 | diff = x->replay.seq - seq; | |
4c4d51a7 HX |
1662 | if (diff >= min_t(unsigned int, x->props.replay_window, |
1663 | sizeof(x->replay.bitmap) * 8)) { | |
1da177e4 | 1664 | x->stats.replay_window++; |
afeb14b4 | 1665 | goto err; |
1da177e4 LT |
1666 | } |
1667 | ||
1668 | if (x->replay.bitmap & (1U << diff)) { | |
1669 | x->stats.replay++; | |
afeb14b4 | 1670 | goto err; |
1da177e4 LT |
1671 | } |
1672 | return 0; | |
afeb14b4 PM |
1673 | |
1674 | err: | |
1675 | xfrm_audit_state_replay(x, skb, net_seq); | |
1676 | return -EINVAL; | |
1da177e4 | 1677 | } |
1da177e4 | 1678 | |
61f4627b | 1679 | void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq) |
1da177e4 LT |
1680 | { |
1681 | u32 diff; | |
61f4627b | 1682 | u32 seq = ntohl(net_seq); |
1da177e4 LT |
1683 | |
1684 | if (seq > x->replay.seq) { | |
1685 | diff = seq - x->replay.seq; | |
1686 | if (diff < x->props.replay_window) | |
1687 | x->replay.bitmap = ((x->replay.bitmap) << diff) | 1; | |
1688 | else | |
1689 | x->replay.bitmap = 1; | |
1690 | x->replay.seq = seq; | |
1691 | } else { | |
1692 | diff = x->replay.seq - seq; | |
1693 | x->replay.bitmap |= (1U << diff); | |
1694 | } | |
f8cd5488 | 1695 | |
a6483b79 | 1696 | if (xfrm_aevent_is_on(xs_net(x))) |
f8cd5488 | 1697 | xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); |
1da177e4 | 1698 | } |
1da177e4 | 1699 | |
df01812e | 1700 | static LIST_HEAD(xfrm_km_list); |
1da177e4 LT |
1701 | static DEFINE_RWLOCK(xfrm_km_lock); |
1702 | ||
26b15dad | 1703 | void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) |
1da177e4 LT |
1704 | { |
1705 | struct xfrm_mgr *km; | |
1706 | ||
26b15dad JHS |
1707 | read_lock(&xfrm_km_lock); |
1708 | list_for_each_entry(km, &xfrm_km_list, list) | |
1709 | if (km->notify_policy) | |
1710 | km->notify_policy(xp, dir, c); | |
1711 | read_unlock(&xfrm_km_lock); | |
1712 | } | |
1da177e4 | 1713 | |
26b15dad JHS |
1714 | void km_state_notify(struct xfrm_state *x, struct km_event *c) |
1715 | { | |
1716 | struct xfrm_mgr *km; | |
1da177e4 LT |
1717 | read_lock(&xfrm_km_lock); |
1718 | list_for_each_entry(km, &xfrm_km_list, list) | |
26b15dad JHS |
1719 | if (km->notify) |
1720 | km->notify(x, c); | |
1da177e4 | 1721 | read_unlock(&xfrm_km_lock); |
26b15dad JHS |
1722 | } |
1723 | ||
1724 | EXPORT_SYMBOL(km_policy_notify); | |
1725 | EXPORT_SYMBOL(km_state_notify); | |
1726 | ||
53bc6b4d | 1727 | void km_state_expired(struct xfrm_state *x, int hard, u32 pid) |
26b15dad | 1728 | { |
98806f75 | 1729 | struct net *net = xs_net(x); |
26b15dad JHS |
1730 | struct km_event c; |
1731 | ||
bf08867f | 1732 | c.data.hard = hard; |
53bc6b4d | 1733 | c.pid = pid; |
f60f6b8f | 1734 | c.event = XFRM_MSG_EXPIRE; |
26b15dad | 1735 | km_state_notify(x, &c); |
1da177e4 LT |
1736 | |
1737 | if (hard) | |
98806f75 | 1738 | wake_up(&net->xfrm.km_waitq); |
1da177e4 LT |
1739 | } |
1740 | ||
53bc6b4d | 1741 | EXPORT_SYMBOL(km_state_expired); |
26b15dad JHS |
1742 | /* |
1743 | * We send to all registered managers regardless of failure | |
1744 | * We are happy with one success | |
1745 | */ | |
980ebd25 | 1746 | int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol) |
1da177e4 | 1747 | { |
26b15dad | 1748 | int err = -EINVAL, acqret; |
1da177e4 LT |
1749 | struct xfrm_mgr *km; |
1750 | ||
1751 | read_lock(&xfrm_km_lock); | |
1752 | list_for_each_entry(km, &xfrm_km_list, list) { | |
26b15dad JHS |
1753 | acqret = km->acquire(x, t, pol, XFRM_POLICY_OUT); |
1754 | if (!acqret) | |
1755 | err = acqret; | |
1da177e4 LT |
1756 | } |
1757 | read_unlock(&xfrm_km_lock); | |
1758 | return err; | |
1759 | } | |
980ebd25 | 1760 | EXPORT_SYMBOL(km_query); |
1da177e4 | 1761 | |
5d36b180 | 1762 | int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) |
1da177e4 LT |
1763 | { |
1764 | int err = -EINVAL; | |
1765 | struct xfrm_mgr *km; | |
1766 | ||
1767 | read_lock(&xfrm_km_lock); | |
1768 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1769 | if (km->new_mapping) | |
1770 | err = km->new_mapping(x, ipaddr, sport); | |
1771 | if (!err) | |
1772 | break; | |
1773 | } | |
1774 | read_unlock(&xfrm_km_lock); | |
1775 | return err; | |
1776 | } | |
1777 | EXPORT_SYMBOL(km_new_mapping); | |
1778 | ||
6c5c8ca7 | 1779 | void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid) |
1da177e4 | 1780 | { |
98806f75 | 1781 | struct net *net = xp_net(pol); |
26b15dad | 1782 | struct km_event c; |
1da177e4 | 1783 | |
bf08867f | 1784 | c.data.hard = hard; |
6c5c8ca7 | 1785 | c.pid = pid; |
f60f6b8f | 1786 | c.event = XFRM_MSG_POLEXPIRE; |
26b15dad | 1787 | km_policy_notify(pol, dir, &c); |
1da177e4 LT |
1788 | |
1789 | if (hard) | |
98806f75 | 1790 | wake_up(&net->xfrm.km_waitq); |
1da177e4 | 1791 | } |
a70fcb0b | 1792 | EXPORT_SYMBOL(km_policy_expired); |
1da177e4 | 1793 | |
2d60abc2 | 1794 | #ifdef CONFIG_XFRM_MIGRATE |
80c9abaa | 1795 | int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type, |
13c1d189 AE |
1796 | struct xfrm_migrate *m, int num_migrate, |
1797 | struct xfrm_kmaddress *k) | |
80c9abaa SS |
1798 | { |
1799 | int err = -EINVAL; | |
1800 | int ret; | |
1801 | struct xfrm_mgr *km; | |
1802 | ||
1803 | read_lock(&xfrm_km_lock); | |
1804 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1805 | if (km->migrate) { | |
13c1d189 | 1806 | ret = km->migrate(sel, dir, type, m, num_migrate, k); |
80c9abaa SS |
1807 | if (!ret) |
1808 | err = ret; | |
1809 | } | |
1810 | } | |
1811 | read_unlock(&xfrm_km_lock); | |
1812 | return err; | |
1813 | } | |
1814 | EXPORT_SYMBOL(km_migrate); | |
2d60abc2 | 1815 | #endif |
80c9abaa | 1816 | |
db983c11 | 1817 | int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr) |
97a64b45 MN |
1818 | { |
1819 | int err = -EINVAL; | |
1820 | int ret; | |
1821 | struct xfrm_mgr *km; | |
1822 | ||
1823 | read_lock(&xfrm_km_lock); | |
1824 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1825 | if (km->report) { | |
db983c11 | 1826 | ret = km->report(net, proto, sel, addr); |
97a64b45 MN |
1827 | if (!ret) |
1828 | err = ret; | |
1829 | } | |
1830 | } | |
1831 | read_unlock(&xfrm_km_lock); | |
1832 | return err; | |
1833 | } | |
1834 | EXPORT_SYMBOL(km_report); | |
1835 | ||
1da177e4 LT |
1836 | int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) |
1837 | { | |
1838 | int err; | |
1839 | u8 *data; | |
1840 | struct xfrm_mgr *km; | |
1841 | struct xfrm_policy *pol = NULL; | |
1842 | ||
1843 | if (optlen <= 0 || optlen > PAGE_SIZE) | |
1844 | return -EMSGSIZE; | |
1845 | ||
1846 | data = kmalloc(optlen, GFP_KERNEL); | |
1847 | if (!data) | |
1848 | return -ENOMEM; | |
1849 | ||
1850 | err = -EFAULT; | |
1851 | if (copy_from_user(data, optval, optlen)) | |
1852 | goto out; | |
1853 | ||
1854 | err = -EINVAL; | |
1855 | read_lock(&xfrm_km_lock); | |
1856 | list_for_each_entry(km, &xfrm_km_list, list) { | |
cb969f07 | 1857 | pol = km->compile_policy(sk, optname, data, |
1da177e4 LT |
1858 | optlen, &err); |
1859 | if (err >= 0) | |
1860 | break; | |
1861 | } | |
1862 | read_unlock(&xfrm_km_lock); | |
1863 | ||
1864 | if (err >= 0) { | |
1865 | xfrm_sk_policy_insert(sk, err, pol); | |
1866 | xfrm_pol_put(pol); | |
1867 | err = 0; | |
1868 | } | |
1869 | ||
1870 | out: | |
1871 | kfree(data); | |
1872 | return err; | |
1873 | } | |
1874 | EXPORT_SYMBOL(xfrm_user_policy); | |
1875 | ||
1876 | int xfrm_register_km(struct xfrm_mgr *km) | |
1877 | { | |
1878 | write_lock_bh(&xfrm_km_lock); | |
1879 | list_add_tail(&km->list, &xfrm_km_list); | |
1880 | write_unlock_bh(&xfrm_km_lock); | |
1881 | return 0; | |
1882 | } | |
1883 | EXPORT_SYMBOL(xfrm_register_km); | |
1884 | ||
1885 | int xfrm_unregister_km(struct xfrm_mgr *km) | |
1886 | { | |
1887 | write_lock_bh(&xfrm_km_lock); | |
1888 | list_del(&km->list); | |
1889 | write_unlock_bh(&xfrm_km_lock); | |
1890 | return 0; | |
1891 | } | |
1892 | EXPORT_SYMBOL(xfrm_unregister_km); | |
1893 | ||
1894 | int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo) | |
1895 | { | |
1896 | int err = 0; | |
1897 | if (unlikely(afinfo == NULL)) | |
1898 | return -EINVAL; | |
1899 | if (unlikely(afinfo->family >= NPROTO)) | |
1900 | return -EAFNOSUPPORT; | |
f3111502 | 1901 | write_lock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1902 | if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL)) |
1903 | err = -ENOBUFS; | |
edcd5821 | 1904 | else |
1da177e4 | 1905 | xfrm_state_afinfo[afinfo->family] = afinfo; |
f3111502 | 1906 | write_unlock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1907 | return err; |
1908 | } | |
1909 | EXPORT_SYMBOL(xfrm_state_register_afinfo); | |
1910 | ||
1911 | int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo) | |
1912 | { | |
1913 | int err = 0; | |
1914 | if (unlikely(afinfo == NULL)) | |
1915 | return -EINVAL; | |
1916 | if (unlikely(afinfo->family >= NPROTO)) | |
1917 | return -EAFNOSUPPORT; | |
f3111502 | 1918 | write_lock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1919 | if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) { |
1920 | if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo)) | |
1921 | err = -EINVAL; | |
edcd5821 | 1922 | else |
1da177e4 | 1923 | xfrm_state_afinfo[afinfo->family] = NULL; |
1da177e4 | 1924 | } |
f3111502 | 1925 | write_unlock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1926 | return err; |
1927 | } | |
1928 | EXPORT_SYMBOL(xfrm_state_unregister_afinfo); | |
1929 | ||
17c2a42a | 1930 | static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family) |
1da177e4 LT |
1931 | { |
1932 | struct xfrm_state_afinfo *afinfo; | |
1933 | if (unlikely(family >= NPROTO)) | |
1934 | return NULL; | |
1935 | read_lock(&xfrm_state_afinfo_lock); | |
1936 | afinfo = xfrm_state_afinfo[family]; | |
546be240 HX |
1937 | if (unlikely(!afinfo)) |
1938 | read_unlock(&xfrm_state_afinfo_lock); | |
1da177e4 LT |
1939 | return afinfo; |
1940 | } | |
1941 | ||
17c2a42a | 1942 | static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo) |
9a429c49 | 1943 | __releases(xfrm_state_afinfo_lock) |
1da177e4 | 1944 | { |
546be240 | 1945 | read_unlock(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1946 | } |
1947 | ||
1948 | /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */ | |
1949 | void xfrm_state_delete_tunnel(struct xfrm_state *x) | |
1950 | { | |
1951 | if (x->tunnel) { | |
1952 | struct xfrm_state *t = x->tunnel; | |
1953 | ||
1954 | if (atomic_read(&t->tunnel_users) == 2) | |
1955 | xfrm_state_delete(t); | |
1956 | atomic_dec(&t->tunnel_users); | |
1957 | xfrm_state_put(t); | |
1958 | x->tunnel = NULL; | |
1959 | } | |
1960 | } | |
1961 | EXPORT_SYMBOL(xfrm_state_delete_tunnel); | |
1962 | ||
1963 | int xfrm_state_mtu(struct xfrm_state *x, int mtu) | |
1964 | { | |
c5c25238 | 1965 | int res; |
1da177e4 | 1966 | |
c5c25238 PM |
1967 | spin_lock_bh(&x->lock); |
1968 | if (x->km.state == XFRM_STATE_VALID && | |
1969 | x->type && x->type->get_mtu) | |
1970 | res = x->type->get_mtu(x, mtu); | |
1971 | else | |
28121617 | 1972 | res = mtu - x->props.header_len; |
c5c25238 | 1973 | spin_unlock_bh(&x->lock); |
1da177e4 LT |
1974 | return res; |
1975 | } | |
1976 | ||
72cb6962 HX |
1977 | int xfrm_init_state(struct xfrm_state *x) |
1978 | { | |
d094cd83 | 1979 | struct xfrm_state_afinfo *afinfo; |
df9dcb45 | 1980 | struct xfrm_mode *inner_mode; |
d094cd83 | 1981 | int family = x->props.family; |
72cb6962 HX |
1982 | int err; |
1983 | ||
d094cd83 HX |
1984 | err = -EAFNOSUPPORT; |
1985 | afinfo = xfrm_state_get_afinfo(family); | |
1986 | if (!afinfo) | |
1987 | goto error; | |
1988 | ||
1989 | err = 0; | |
1990 | if (afinfo->init_flags) | |
1991 | err = afinfo->init_flags(x); | |
1992 | ||
1993 | xfrm_state_put_afinfo(afinfo); | |
1994 | ||
1995 | if (err) | |
1996 | goto error; | |
1997 | ||
1998 | err = -EPROTONOSUPPORT; | |
13996378 | 1999 | |
df9dcb45 KM |
2000 | if (x->sel.family != AF_UNSPEC) { |
2001 | inner_mode = xfrm_get_mode(x->props.mode, x->sel.family); | |
2002 | if (inner_mode == NULL) | |
2003 | goto error; | |
2004 | ||
2005 | if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) && | |
2006 | family != x->sel.family) { | |
2007 | xfrm_put_mode(inner_mode); | |
2008 | goto error; | |
2009 | } | |
2010 | ||
2011 | x->inner_mode = inner_mode; | |
2012 | } else { | |
2013 | struct xfrm_mode *inner_mode_iaf; | |
d81d2285 | 2014 | int iafamily = AF_INET; |
df9dcb45 | 2015 | |
d81d2285 | 2016 | inner_mode = xfrm_get_mode(x->props.mode, x->props.family); |
df9dcb45 KM |
2017 | if (inner_mode == NULL) |
2018 | goto error; | |
2019 | ||
2020 | if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) { | |
2021 | xfrm_put_mode(inner_mode); | |
2022 | goto error; | |
2023 | } | |
d81d2285 | 2024 | x->inner_mode = inner_mode; |
df9dcb45 | 2025 | |
d81d2285 MW |
2026 | if (x->props.family == AF_INET) |
2027 | iafamily = AF_INET6; | |
df9dcb45 | 2028 | |
d81d2285 MW |
2029 | inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily); |
2030 | if (inner_mode_iaf) { | |
2031 | if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL) | |
2032 | x->inner_mode_iaf = inner_mode_iaf; | |
2033 | else | |
2034 | xfrm_put_mode(inner_mode_iaf); | |
df9dcb45 KM |
2035 | } |
2036 | } | |
13996378 | 2037 | |
d094cd83 | 2038 | x->type = xfrm_get_type(x->id.proto, family); |
72cb6962 HX |
2039 | if (x->type == NULL) |
2040 | goto error; | |
2041 | ||
2042 | err = x->type->init_state(x); | |
2043 | if (err) | |
2044 | goto error; | |
2045 | ||
13996378 HX |
2046 | x->outer_mode = xfrm_get_mode(x->props.mode, family); |
2047 | if (x->outer_mode == NULL) | |
b59f45d0 HX |
2048 | goto error; |
2049 | ||
72cb6962 HX |
2050 | x->km.state = XFRM_STATE_VALID; |
2051 | ||
2052 | error: | |
2053 | return err; | |
2054 | } | |
2055 | ||
2056 | EXPORT_SYMBOL(xfrm_init_state); | |
a716c119 | 2057 | |
d62ddc21 | 2058 | int __net_init xfrm_state_init(struct net *net) |
1da177e4 | 2059 | { |
f034b5d4 DM |
2060 | unsigned int sz; |
2061 | ||
9d4139c7 AD |
2062 | INIT_LIST_HEAD(&net->xfrm.state_all); |
2063 | ||
f034b5d4 DM |
2064 | sz = sizeof(struct hlist_head) * 8; |
2065 | ||
73d189dc AD |
2066 | net->xfrm.state_bydst = xfrm_hash_alloc(sz); |
2067 | if (!net->xfrm.state_bydst) | |
2068 | goto out_bydst; | |
d320bbb3 AD |
2069 | net->xfrm.state_bysrc = xfrm_hash_alloc(sz); |
2070 | if (!net->xfrm.state_bysrc) | |
2071 | goto out_bysrc; | |
b754a4fd AD |
2072 | net->xfrm.state_byspi = xfrm_hash_alloc(sz); |
2073 | if (!net->xfrm.state_byspi) | |
2074 | goto out_byspi; | |
529983ec | 2075 | net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1); |
1da177e4 | 2076 | |
0bf7c5b0 | 2077 | net->xfrm.state_num = 0; |
63082733 | 2078 | INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize); |
b8a0ae20 | 2079 | INIT_HLIST_HEAD(&net->xfrm.state_gc_list); |
c7837144 | 2080 | INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task); |
50a30657 | 2081 | init_waitqueue_head(&net->xfrm.km_waitq); |
d62ddc21 | 2082 | return 0; |
73d189dc | 2083 | |
b754a4fd AD |
2084 | out_byspi: |
2085 | xfrm_hash_free(net->xfrm.state_bysrc, sz); | |
d320bbb3 AD |
2086 | out_bysrc: |
2087 | xfrm_hash_free(net->xfrm.state_bydst, sz); | |
73d189dc AD |
2088 | out_bydst: |
2089 | return -ENOMEM; | |
d62ddc21 AD |
2090 | } |
2091 | ||
2092 | void xfrm_state_fini(struct net *net) | |
2093 | { | |
7c2776ee | 2094 | struct xfrm_audit audit_info; |
73d189dc AD |
2095 | unsigned int sz; |
2096 | ||
7c2776ee AD |
2097 | flush_work(&net->xfrm.state_hash_work); |
2098 | audit_info.loginuid = -1; | |
2099 | audit_info.sessionid = -1; | |
2100 | audit_info.secid = 0; | |
2101 | xfrm_state_flush(net, IPSEC_PROTO_ANY, &audit_info); | |
2102 | flush_work(&net->xfrm.state_gc_work); | |
2103 | ||
9d4139c7 | 2104 | WARN_ON(!list_empty(&net->xfrm.state_all)); |
73d189dc | 2105 | |
529983ec | 2106 | sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head); |
b754a4fd AD |
2107 | WARN_ON(!hlist_empty(net->xfrm.state_byspi)); |
2108 | xfrm_hash_free(net->xfrm.state_byspi, sz); | |
d320bbb3 AD |
2109 | WARN_ON(!hlist_empty(net->xfrm.state_bysrc)); |
2110 | xfrm_hash_free(net->xfrm.state_bysrc, sz); | |
73d189dc AD |
2111 | WARN_ON(!hlist_empty(net->xfrm.state_bydst)); |
2112 | xfrm_hash_free(net->xfrm.state_bydst, sz); | |
1da177e4 LT |
2113 | } |
2114 | ||
ab5f5e8b | 2115 | #ifdef CONFIG_AUDITSYSCALL |
cf35f43e IJ |
2116 | static void xfrm_audit_helper_sainfo(struct xfrm_state *x, |
2117 | struct audit_buffer *audit_buf) | |
ab5f5e8b | 2118 | { |
68277acc PM |
2119 | struct xfrm_sec_ctx *ctx = x->security; |
2120 | u32 spi = ntohl(x->id.spi); | |
2121 | ||
2122 | if (ctx) | |
ab5f5e8b | 2123 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", |
68277acc | 2124 | ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); |
ab5f5e8b JL |
2125 | |
2126 | switch(x->props.family) { | |
2127 | case AF_INET: | |
21454aaa HH |
2128 | audit_log_format(audit_buf, " src=%pI4 dst=%pI4", |
2129 | &x->props.saddr.a4, &x->id.daddr.a4); | |
ab5f5e8b JL |
2130 | break; |
2131 | case AF_INET6: | |
5b095d98 | 2132 | audit_log_format(audit_buf, " src=%pI6 dst=%pI6", |
fdb46ee7 | 2133 | x->props.saddr.a6, x->id.daddr.a6); |
ab5f5e8b JL |
2134 | break; |
2135 | } | |
68277acc PM |
2136 | |
2137 | audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); | |
ab5f5e8b JL |
2138 | } |
2139 | ||
cf35f43e IJ |
2140 | static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family, |
2141 | struct audit_buffer *audit_buf) | |
afeb14b4 PM |
2142 | { |
2143 | struct iphdr *iph4; | |
2144 | struct ipv6hdr *iph6; | |
2145 | ||
2146 | switch (family) { | |
2147 | case AF_INET: | |
2148 | iph4 = ip_hdr(skb); | |
21454aaa HH |
2149 | audit_log_format(audit_buf, " src=%pI4 dst=%pI4", |
2150 | &iph4->saddr, &iph4->daddr); | |
afeb14b4 PM |
2151 | break; |
2152 | case AF_INET6: | |
2153 | iph6 = ipv6_hdr(skb); | |
2154 | audit_log_format(audit_buf, | |
5b095d98 | 2155 | " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x", |
fdb46ee7 | 2156 | &iph6->saddr,&iph6->daddr, |
afeb14b4 PM |
2157 | iph6->flow_lbl[0] & 0x0f, |
2158 | iph6->flow_lbl[1], | |
2159 | iph6->flow_lbl[2]); | |
2160 | break; | |
2161 | } | |
2162 | } | |
2163 | ||
68277acc | 2164 | void xfrm_audit_state_add(struct xfrm_state *x, int result, |
2532386f | 2165 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2166 | { |
2167 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2168 | |
afeb14b4 | 2169 | audit_buf = xfrm_audit_start("SAD-add"); |
ab5f5e8b JL |
2170 | if (audit_buf == NULL) |
2171 | return; | |
2532386f | 2172 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 PM |
2173 | xfrm_audit_helper_sainfo(x, audit_buf); |
2174 | audit_log_format(audit_buf, " res=%u", result); | |
ab5f5e8b JL |
2175 | audit_log_end(audit_buf); |
2176 | } | |
2177 | EXPORT_SYMBOL_GPL(xfrm_audit_state_add); | |
2178 | ||
68277acc | 2179 | void xfrm_audit_state_delete(struct xfrm_state *x, int result, |
2532386f | 2180 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2181 | { |
2182 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2183 | |
afeb14b4 | 2184 | audit_buf = xfrm_audit_start("SAD-delete"); |
ab5f5e8b JL |
2185 | if (audit_buf == NULL) |
2186 | return; | |
2532386f | 2187 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 PM |
2188 | xfrm_audit_helper_sainfo(x, audit_buf); |
2189 | audit_log_format(audit_buf, " res=%u", result); | |
ab5f5e8b JL |
2190 | audit_log_end(audit_buf); |
2191 | } | |
2192 | EXPORT_SYMBOL_GPL(xfrm_audit_state_delete); | |
afeb14b4 PM |
2193 | |
2194 | void xfrm_audit_state_replay_overflow(struct xfrm_state *x, | |
2195 | struct sk_buff *skb) | |
2196 | { | |
2197 | struct audit_buffer *audit_buf; | |
2198 | u32 spi; | |
2199 | ||
2200 | audit_buf = xfrm_audit_start("SA-replay-overflow"); | |
2201 | if (audit_buf == NULL) | |
2202 | return; | |
2203 | xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); | |
2204 | /* don't record the sequence number because it's inherent in this kind | |
2205 | * of audit message */ | |
2206 | spi = ntohl(x->id.spi); | |
2207 | audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); | |
2208 | audit_log_end(audit_buf); | |
2209 | } | |
2210 | EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow); | |
2211 | ||
2212 | static void xfrm_audit_state_replay(struct xfrm_state *x, | |
2213 | struct sk_buff *skb, __be32 net_seq) | |
2214 | { | |
2215 | struct audit_buffer *audit_buf; | |
2216 | u32 spi; | |
2217 | ||
2218 | audit_buf = xfrm_audit_start("SA-replayed-pkt"); | |
2219 | if (audit_buf == NULL) | |
2220 | return; | |
2221 | xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); | |
2222 | spi = ntohl(x->id.spi); | |
2223 | audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", | |
2224 | spi, spi, ntohl(net_seq)); | |
2225 | audit_log_end(audit_buf); | |
2226 | } | |
2227 | ||
2228 | void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family) | |
2229 | { | |
2230 | struct audit_buffer *audit_buf; | |
2231 | ||
2232 | audit_buf = xfrm_audit_start("SA-notfound"); | |
2233 | if (audit_buf == NULL) | |
2234 | return; | |
2235 | xfrm_audit_helper_pktinfo(skb, family, audit_buf); | |
2236 | audit_log_end(audit_buf); | |
2237 | } | |
2238 | EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple); | |
2239 | ||
2240 | void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, | |
2241 | __be32 net_spi, __be32 net_seq) | |
2242 | { | |
2243 | struct audit_buffer *audit_buf; | |
2244 | u32 spi; | |
2245 | ||
2246 | audit_buf = xfrm_audit_start("SA-notfound"); | |
2247 | if (audit_buf == NULL) | |
2248 | return; | |
2249 | xfrm_audit_helper_pktinfo(skb, family, audit_buf); | |
2250 | spi = ntohl(net_spi); | |
2251 | audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", | |
2252 | spi, spi, ntohl(net_seq)); | |
2253 | audit_log_end(audit_buf); | |
2254 | } | |
2255 | EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound); | |
2256 | ||
2257 | void xfrm_audit_state_icvfail(struct xfrm_state *x, | |
2258 | struct sk_buff *skb, u8 proto) | |
2259 | { | |
2260 | struct audit_buffer *audit_buf; | |
2261 | __be32 net_spi; | |
2262 | __be32 net_seq; | |
2263 | ||
2264 | audit_buf = xfrm_audit_start("SA-icv-failure"); | |
2265 | if (audit_buf == NULL) | |
2266 | return; | |
2267 | xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); | |
2268 | if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) { | |
2269 | u32 spi = ntohl(net_spi); | |
2270 | audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", | |
2271 | spi, spi, ntohl(net_seq)); | |
2272 | } | |
2273 | audit_log_end(audit_buf); | |
2274 | } | |
2275 | EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail); | |
ab5f5e8b | 2276 | #endif /* CONFIG_AUDITSYSCALL */ |