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Commit | Line | Data |
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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> | |
21 | #include <asm/uaccess.h> | |
22 | ||
ee857a7d DM |
23 | struct sock *xfrm_nl; |
24 | EXPORT_SYMBOL(xfrm_nl); | |
25 | ||
f8cd5488 | 26 | u32 sysctl_xfrm_aevent_etime = XFRM_AE_ETIME; |
a70fcb0b DM |
27 | EXPORT_SYMBOL(sysctl_xfrm_aevent_etime); |
28 | ||
f8cd5488 | 29 | u32 sysctl_xfrm_aevent_rseqth = XFRM_AE_SEQT_SIZE; |
a70fcb0b DM |
30 | EXPORT_SYMBOL(sysctl_xfrm_aevent_rseqth); |
31 | ||
1da177e4 LT |
32 | /* Each xfrm_state may be linked to two tables: |
33 | ||
34 | 1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl) | |
35 | 2. Hash table by daddr to find what SAs exist for given | |
36 | destination/tunnel endpoint. (output) | |
37 | */ | |
38 | ||
39 | static DEFINE_SPINLOCK(xfrm_state_lock); | |
40 | ||
41 | /* Hash table to find appropriate SA towards given target (endpoint | |
42 | * of tunnel or destination of transport mode) allowed by selector. | |
43 | * | |
44 | * Main use is finding SA after policy selected tunnel or transport mode. | |
45 | * Also, it can be used by ah/esp icmp error handler to find offending SA. | |
46 | */ | |
47 | static struct list_head xfrm_state_bydst[XFRM_DST_HSIZE]; | |
6c44e6b7 | 48 | static struct list_head xfrm_state_bysrc[XFRM_DST_HSIZE]; |
1da177e4 LT |
49 | static struct list_head xfrm_state_byspi[XFRM_DST_HSIZE]; |
50 | ||
2770834c DM |
51 | static __inline__ |
52 | unsigned xfrm_dst_hash(xfrm_address_t *addr, unsigned short family) | |
53 | { | |
54 | switch (family) { | |
55 | case AF_INET: | |
56 | return __xfrm4_dst_hash(addr); | |
57 | case AF_INET6: | |
58 | return __xfrm6_dst_hash(addr); | |
59 | } | |
60 | return 0; | |
61 | } | |
62 | ||
1da177e4 LT |
63 | DECLARE_WAIT_QUEUE_HEAD(km_waitq); |
64 | EXPORT_SYMBOL(km_waitq); | |
65 | ||
66 | static DEFINE_RWLOCK(xfrm_state_afinfo_lock); | |
67 | static struct xfrm_state_afinfo *xfrm_state_afinfo[NPROTO]; | |
68 | ||
69 | static struct work_struct xfrm_state_gc_work; | |
70 | static struct list_head xfrm_state_gc_list = LIST_HEAD_INIT(xfrm_state_gc_list); | |
71 | static DEFINE_SPINLOCK(xfrm_state_gc_lock); | |
72 | ||
73 | static int xfrm_state_gc_flush_bundles; | |
74 | ||
53bc6b4d | 75 | int __xfrm_state_delete(struct xfrm_state *x); |
1da177e4 LT |
76 | |
77 | static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family); | |
78 | static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo); | |
79 | ||
980ebd25 | 80 | int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); |
53bc6b4d | 81 | void km_state_expired(struct xfrm_state *x, int hard, u32 pid); |
1da177e4 LT |
82 | |
83 | static void xfrm_state_gc_destroy(struct xfrm_state *x) | |
84 | { | |
85 | if (del_timer(&x->timer)) | |
86 | BUG(); | |
f8cd5488 JHS |
87 | if (del_timer(&x->rtimer)) |
88 | BUG(); | |
a51482bd JJ |
89 | kfree(x->aalg); |
90 | kfree(x->ealg); | |
91 | kfree(x->calg); | |
92 | kfree(x->encap); | |
060f02a3 | 93 | kfree(x->coaddr); |
b59f45d0 HX |
94 | if (x->mode) |
95 | xfrm_put_mode(x->mode); | |
1da177e4 LT |
96 | if (x->type) { |
97 | x->type->destructor(x); | |
98 | xfrm_put_type(x->type); | |
99 | } | |
df71837d | 100 | security_xfrm_state_free(x); |
1da177e4 LT |
101 | kfree(x); |
102 | } | |
103 | ||
104 | static void xfrm_state_gc_task(void *data) | |
105 | { | |
106 | struct xfrm_state *x; | |
107 | struct list_head *entry, *tmp; | |
108 | struct list_head gc_list = LIST_HEAD_INIT(gc_list); | |
109 | ||
110 | if (xfrm_state_gc_flush_bundles) { | |
111 | xfrm_state_gc_flush_bundles = 0; | |
112 | xfrm_flush_bundles(); | |
113 | } | |
114 | ||
115 | spin_lock_bh(&xfrm_state_gc_lock); | |
116 | list_splice_init(&xfrm_state_gc_list, &gc_list); | |
117 | spin_unlock_bh(&xfrm_state_gc_lock); | |
118 | ||
119 | list_for_each_safe(entry, tmp, &gc_list) { | |
120 | x = list_entry(entry, struct xfrm_state, bydst); | |
121 | xfrm_state_gc_destroy(x); | |
122 | } | |
123 | wake_up(&km_waitq); | |
124 | } | |
125 | ||
126 | static inline unsigned long make_jiffies(long secs) | |
127 | { | |
128 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
129 | return MAX_SCHEDULE_TIMEOUT-1; | |
130 | else | |
131 | return secs*HZ; | |
132 | } | |
133 | ||
134 | static void xfrm_timer_handler(unsigned long data) | |
135 | { | |
136 | struct xfrm_state *x = (struct xfrm_state*)data; | |
137 | unsigned long now = (unsigned long)xtime.tv_sec; | |
138 | long next = LONG_MAX; | |
139 | int warn = 0; | |
140 | ||
141 | spin_lock(&x->lock); | |
142 | if (x->km.state == XFRM_STATE_DEAD) | |
143 | goto out; | |
144 | if (x->km.state == XFRM_STATE_EXPIRED) | |
145 | goto expired; | |
146 | if (x->lft.hard_add_expires_seconds) { | |
147 | long tmo = x->lft.hard_add_expires_seconds + | |
148 | x->curlft.add_time - now; | |
149 | if (tmo <= 0) | |
150 | goto expired; | |
151 | if (tmo < next) | |
152 | next = tmo; | |
153 | } | |
154 | if (x->lft.hard_use_expires_seconds) { | |
155 | long tmo = x->lft.hard_use_expires_seconds + | |
156 | (x->curlft.use_time ? : now) - now; | |
157 | if (tmo <= 0) | |
158 | goto expired; | |
159 | if (tmo < next) | |
160 | next = tmo; | |
161 | } | |
162 | if (x->km.dying) | |
163 | goto resched; | |
164 | if (x->lft.soft_add_expires_seconds) { | |
165 | long tmo = x->lft.soft_add_expires_seconds + | |
166 | x->curlft.add_time - now; | |
167 | if (tmo <= 0) | |
168 | warn = 1; | |
169 | else if (tmo < next) | |
170 | next = tmo; | |
171 | } | |
172 | if (x->lft.soft_use_expires_seconds) { | |
173 | long tmo = x->lft.soft_use_expires_seconds + | |
174 | (x->curlft.use_time ? : now) - now; | |
175 | if (tmo <= 0) | |
176 | warn = 1; | |
177 | else if (tmo < next) | |
178 | next = tmo; | |
179 | } | |
180 | ||
4666faab | 181 | x->km.dying = warn; |
1da177e4 | 182 | if (warn) |
53bc6b4d | 183 | km_state_expired(x, 0, 0); |
1da177e4 LT |
184 | resched: |
185 | if (next != LONG_MAX && | |
186 | !mod_timer(&x->timer, jiffies + make_jiffies(next))) | |
187 | xfrm_state_hold(x); | |
188 | goto out; | |
189 | ||
190 | expired: | |
191 | if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) { | |
192 | x->km.state = XFRM_STATE_EXPIRED; | |
193 | wake_up(&km_waitq); | |
194 | next = 2; | |
195 | goto resched; | |
196 | } | |
4666faab | 197 | if (!__xfrm_state_delete(x) && x->id.spi) |
53bc6b4d | 198 | km_state_expired(x, 1, 0); |
1da177e4 LT |
199 | |
200 | out: | |
201 | spin_unlock(&x->lock); | |
202 | xfrm_state_put(x); | |
203 | } | |
204 | ||
0ac84752 DM |
205 | static void xfrm_replay_timer_handler(unsigned long data); |
206 | ||
1da177e4 LT |
207 | struct xfrm_state *xfrm_state_alloc(void) |
208 | { | |
209 | struct xfrm_state *x; | |
210 | ||
0da974f4 | 211 | x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC); |
1da177e4 LT |
212 | |
213 | if (x) { | |
1da177e4 LT |
214 | atomic_set(&x->refcnt, 1); |
215 | atomic_set(&x->tunnel_users, 0); | |
216 | INIT_LIST_HEAD(&x->bydst); | |
6c44e6b7 | 217 | INIT_LIST_HEAD(&x->bysrc); |
1da177e4 LT |
218 | INIT_LIST_HEAD(&x->byspi); |
219 | init_timer(&x->timer); | |
220 | x->timer.function = xfrm_timer_handler; | |
221 | x->timer.data = (unsigned long)x; | |
f8cd5488 JHS |
222 | init_timer(&x->rtimer); |
223 | x->rtimer.function = xfrm_replay_timer_handler; | |
224 | x->rtimer.data = (unsigned long)x; | |
1da177e4 LT |
225 | x->curlft.add_time = (unsigned long)xtime.tv_sec; |
226 | x->lft.soft_byte_limit = XFRM_INF; | |
227 | x->lft.soft_packet_limit = XFRM_INF; | |
228 | x->lft.hard_byte_limit = XFRM_INF; | |
229 | x->lft.hard_packet_limit = XFRM_INF; | |
f8cd5488 JHS |
230 | x->replay_maxage = 0; |
231 | x->replay_maxdiff = 0; | |
1da177e4 LT |
232 | spin_lock_init(&x->lock); |
233 | } | |
234 | return x; | |
235 | } | |
236 | EXPORT_SYMBOL(xfrm_state_alloc); | |
237 | ||
238 | void __xfrm_state_destroy(struct xfrm_state *x) | |
239 | { | |
240 | BUG_TRAP(x->km.state == XFRM_STATE_DEAD); | |
241 | ||
242 | spin_lock_bh(&xfrm_state_gc_lock); | |
243 | list_add(&x->bydst, &xfrm_state_gc_list); | |
244 | spin_unlock_bh(&xfrm_state_gc_lock); | |
245 | schedule_work(&xfrm_state_gc_work); | |
246 | } | |
247 | EXPORT_SYMBOL(__xfrm_state_destroy); | |
248 | ||
53bc6b4d | 249 | int __xfrm_state_delete(struct xfrm_state *x) |
1da177e4 | 250 | { |
26b15dad JHS |
251 | int err = -ESRCH; |
252 | ||
1da177e4 LT |
253 | if (x->km.state != XFRM_STATE_DEAD) { |
254 | x->km.state = XFRM_STATE_DEAD; | |
255 | spin_lock(&xfrm_state_lock); | |
256 | list_del(&x->bydst); | |
21380b81 | 257 | __xfrm_state_put(x); |
6c44e6b7 MN |
258 | list_del(&x->bysrc); |
259 | __xfrm_state_put(x); | |
1da177e4 LT |
260 | if (x->id.spi) { |
261 | list_del(&x->byspi); | |
21380b81 | 262 | __xfrm_state_put(x); |
1da177e4 LT |
263 | } |
264 | spin_unlock(&xfrm_state_lock); | |
265 | if (del_timer(&x->timer)) | |
21380b81 | 266 | __xfrm_state_put(x); |
f8cd5488 JHS |
267 | if (del_timer(&x->rtimer)) |
268 | __xfrm_state_put(x); | |
1da177e4 LT |
269 | |
270 | /* The number two in this test is the reference | |
271 | * mentioned in the comment below plus the reference | |
272 | * our caller holds. A larger value means that | |
273 | * there are DSTs attached to this xfrm_state. | |
274 | */ | |
275 | if (atomic_read(&x->refcnt) > 2) { | |
276 | xfrm_state_gc_flush_bundles = 1; | |
277 | schedule_work(&xfrm_state_gc_work); | |
278 | } | |
279 | ||
280 | /* All xfrm_state objects are created by xfrm_state_alloc. | |
281 | * The xfrm_state_alloc call gives a reference, and that | |
282 | * is what we are dropping here. | |
283 | */ | |
21380b81 | 284 | __xfrm_state_put(x); |
26b15dad | 285 | err = 0; |
1da177e4 | 286 | } |
26b15dad JHS |
287 | |
288 | return err; | |
1da177e4 | 289 | } |
53bc6b4d | 290 | EXPORT_SYMBOL(__xfrm_state_delete); |
1da177e4 | 291 | |
26b15dad | 292 | int xfrm_state_delete(struct xfrm_state *x) |
1da177e4 | 293 | { |
26b15dad JHS |
294 | int err; |
295 | ||
1da177e4 | 296 | spin_lock_bh(&x->lock); |
26b15dad | 297 | err = __xfrm_state_delete(x); |
1da177e4 | 298 | spin_unlock_bh(&x->lock); |
26b15dad JHS |
299 | |
300 | return err; | |
1da177e4 LT |
301 | } |
302 | EXPORT_SYMBOL(xfrm_state_delete); | |
303 | ||
304 | void xfrm_state_flush(u8 proto) | |
305 | { | |
306 | int i; | |
307 | struct xfrm_state *x; | |
308 | ||
309 | spin_lock_bh(&xfrm_state_lock); | |
310 | for (i = 0; i < XFRM_DST_HSIZE; i++) { | |
311 | restart: | |
312 | list_for_each_entry(x, xfrm_state_bydst+i, bydst) { | |
313 | if (!xfrm_state_kern(x) && | |
5794708f | 314 | xfrm_id_proto_match(x->id.proto, proto)) { |
1da177e4 LT |
315 | xfrm_state_hold(x); |
316 | spin_unlock_bh(&xfrm_state_lock); | |
317 | ||
318 | xfrm_state_delete(x); | |
319 | xfrm_state_put(x); | |
320 | ||
321 | spin_lock_bh(&xfrm_state_lock); | |
322 | goto restart; | |
323 | } | |
324 | } | |
325 | } | |
326 | spin_unlock_bh(&xfrm_state_lock); | |
327 | wake_up(&km_waitq); | |
328 | } | |
329 | EXPORT_SYMBOL(xfrm_state_flush); | |
330 | ||
331 | static int | |
332 | xfrm_init_tempsel(struct xfrm_state *x, struct flowi *fl, | |
333 | struct xfrm_tmpl *tmpl, | |
334 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
335 | unsigned short family) | |
336 | { | |
337 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
338 | if (!afinfo) | |
339 | return -1; | |
340 | afinfo->init_tempsel(x, fl, tmpl, daddr, saddr); | |
341 | xfrm_state_put_afinfo(afinfo); | |
342 | return 0; | |
343 | } | |
344 | ||
345 | struct xfrm_state * | |
346 | xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, | |
347 | struct flowi *fl, struct xfrm_tmpl *tmpl, | |
348 | struct xfrm_policy *pol, int *err, | |
349 | unsigned short family) | |
350 | { | |
351 | unsigned h = xfrm_dst_hash(daddr, family); | |
352 | struct xfrm_state *x, *x0; | |
353 | int acquire_in_progress = 0; | |
354 | int error = 0; | |
355 | struct xfrm_state *best = NULL; | |
356 | struct xfrm_state_afinfo *afinfo; | |
357 | ||
358 | afinfo = xfrm_state_get_afinfo(family); | |
359 | if (afinfo == NULL) { | |
360 | *err = -EAFNOSUPPORT; | |
361 | return NULL; | |
362 | } | |
363 | ||
364 | spin_lock_bh(&xfrm_state_lock); | |
365 | list_for_each_entry(x, xfrm_state_bydst+h, bydst) { | |
366 | if (x->props.family == family && | |
367 | x->props.reqid == tmpl->reqid && | |
fbd9a5b4 | 368 | !(x->props.flags & XFRM_STATE_WILDRECV) && |
1da177e4 LT |
369 | xfrm_state_addr_check(x, daddr, saddr, family) && |
370 | tmpl->mode == x->props.mode && | |
371 | tmpl->id.proto == x->id.proto && | |
372 | (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) { | |
373 | /* Resolution logic: | |
374 | 1. There is a valid state with matching selector. | |
375 | Done. | |
376 | 2. Valid state with inappropriate selector. Skip. | |
377 | ||
378 | Entering area of "sysdeps". | |
379 | ||
380 | 3. If state is not valid, selector is temporary, | |
381 | it selects only session which triggered | |
382 | previous resolution. Key manager will do | |
383 | something to install a state with proper | |
384 | selector. | |
385 | */ | |
386 | if (x->km.state == XFRM_STATE_VALID) { | |
df71837d | 387 | if (!xfrm_selector_match(&x->sel, fl, family) || |
e0d1caa7 | 388 | !security_xfrm_state_pol_flow_match(x, pol, fl)) |
1da177e4 LT |
389 | continue; |
390 | if (!best || | |
391 | best->km.dying > x->km.dying || | |
392 | (best->km.dying == x->km.dying && | |
393 | best->curlft.add_time < x->curlft.add_time)) | |
394 | best = x; | |
395 | } else if (x->km.state == XFRM_STATE_ACQ) { | |
396 | acquire_in_progress = 1; | |
397 | } else if (x->km.state == XFRM_STATE_ERROR || | |
398 | x->km.state == XFRM_STATE_EXPIRED) { | |
df71837d | 399 | if (xfrm_selector_match(&x->sel, fl, family) && |
e0d1caa7 | 400 | security_xfrm_state_pol_flow_match(x, pol, fl)) |
1da177e4 LT |
401 | error = -ESRCH; |
402 | } | |
403 | } | |
404 | } | |
405 | ||
406 | x = best; | |
407 | if (!x && !error && !acquire_in_progress) { | |
5c5d281a PM |
408 | if (tmpl->id.spi && |
409 | (x0 = afinfo->state_lookup(daddr, tmpl->id.spi, | |
410 | tmpl->id.proto)) != NULL) { | |
1da177e4 LT |
411 | xfrm_state_put(x0); |
412 | error = -EEXIST; | |
413 | goto out; | |
414 | } | |
415 | x = xfrm_state_alloc(); | |
416 | if (x == NULL) { | |
417 | error = -ENOMEM; | |
418 | goto out; | |
419 | } | |
420 | /* Initialize temporary selector matching only | |
421 | * to current session. */ | |
422 | xfrm_init_tempsel(x, fl, tmpl, daddr, saddr, family); | |
423 | ||
e0d1caa7 VY |
424 | error = security_xfrm_state_alloc_acquire(x, pol->security, fl->secid); |
425 | if (error) { | |
426 | x->km.state = XFRM_STATE_DEAD; | |
427 | xfrm_state_put(x); | |
428 | x = NULL; | |
429 | goto out; | |
430 | } | |
431 | ||
1da177e4 LT |
432 | if (km_query(x, tmpl, pol) == 0) { |
433 | x->km.state = XFRM_STATE_ACQ; | |
434 | list_add_tail(&x->bydst, xfrm_state_bydst+h); | |
435 | xfrm_state_hold(x); | |
6c44e6b7 MN |
436 | list_add_tail(&x->bysrc, xfrm_state_bysrc+h); |
437 | xfrm_state_hold(x); | |
1da177e4 LT |
438 | if (x->id.spi) { |
439 | h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, family); | |
440 | list_add(&x->byspi, xfrm_state_byspi+h); | |
441 | xfrm_state_hold(x); | |
442 | } | |
443 | x->lft.hard_add_expires_seconds = XFRM_ACQ_EXPIRES; | |
444 | xfrm_state_hold(x); | |
445 | x->timer.expires = jiffies + XFRM_ACQ_EXPIRES*HZ; | |
446 | add_timer(&x->timer); | |
447 | } else { | |
448 | x->km.state = XFRM_STATE_DEAD; | |
449 | xfrm_state_put(x); | |
450 | x = NULL; | |
451 | error = -ESRCH; | |
452 | } | |
453 | } | |
454 | out: | |
455 | if (x) | |
456 | xfrm_state_hold(x); | |
457 | else | |
458 | *err = acquire_in_progress ? -EAGAIN : error; | |
459 | spin_unlock_bh(&xfrm_state_lock); | |
460 | xfrm_state_put_afinfo(afinfo); | |
461 | return x; | |
462 | } | |
463 | ||
464 | static void __xfrm_state_insert(struct xfrm_state *x) | |
465 | { | |
466 | unsigned h = xfrm_dst_hash(&x->id.daddr, x->props.family); | |
467 | ||
468 | list_add(&x->bydst, xfrm_state_bydst+h); | |
469 | xfrm_state_hold(x); | |
470 | ||
6c44e6b7 | 471 | h = xfrm_src_hash(&x->props.saddr, x->props.family); |
1da177e4 | 472 | |
6c44e6b7 | 473 | list_add(&x->bysrc, xfrm_state_bysrc+h); |
1da177e4 LT |
474 | xfrm_state_hold(x); |
475 | ||
6c44e6b7 MN |
476 | if (xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY)) { |
477 | h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, | |
478 | x->props.family); | |
479 | ||
480 | list_add(&x->byspi, xfrm_state_byspi+h); | |
481 | xfrm_state_hold(x); | |
482 | } | |
483 | ||
1da177e4 LT |
484 | if (!mod_timer(&x->timer, jiffies + HZ)) |
485 | xfrm_state_hold(x); | |
486 | ||
f8cd5488 JHS |
487 | if (x->replay_maxage && |
488 | !mod_timer(&x->rtimer, jiffies + x->replay_maxage)) | |
489 | xfrm_state_hold(x); | |
490 | ||
1da177e4 LT |
491 | wake_up(&km_waitq); |
492 | } | |
493 | ||
494 | void xfrm_state_insert(struct xfrm_state *x) | |
495 | { | |
496 | spin_lock_bh(&xfrm_state_lock); | |
497 | __xfrm_state_insert(x); | |
498 | spin_unlock_bh(&xfrm_state_lock); | |
399c180a DM |
499 | |
500 | xfrm_flush_all_bundles(); | |
1da177e4 LT |
501 | } |
502 | EXPORT_SYMBOL(xfrm_state_insert); | |
503 | ||
2770834c DM |
504 | /* xfrm_state_lock is held */ |
505 | static struct xfrm_state *__find_acq_core(unsigned short family, u8 mode, u32 reqid, u8 proto, xfrm_address_t *daddr, xfrm_address_t *saddr, int create) | |
506 | { | |
507 | unsigned int h = xfrm_dst_hash(daddr, family); | |
508 | struct xfrm_state *x; | |
509 | ||
510 | list_for_each_entry(x, xfrm_state_bydst+h, bydst) { | |
511 | if (x->props.reqid != reqid || | |
512 | x->props.mode != mode || | |
513 | x->props.family != family || | |
514 | x->km.state != XFRM_STATE_ACQ || | |
515 | x->id.spi != 0) | |
516 | continue; | |
517 | ||
518 | switch (family) { | |
519 | case AF_INET: | |
520 | if (x->id.daddr.a4 != daddr->a4 || | |
521 | x->props.saddr.a4 != saddr->a4) | |
522 | continue; | |
523 | break; | |
524 | case AF_INET6: | |
525 | if (!ipv6_addr_equal((struct in6_addr *)x->id.daddr.a6, | |
526 | (struct in6_addr *)daddr) || | |
527 | !ipv6_addr_equal((struct in6_addr *) | |
528 | x->props.saddr.a6, | |
529 | (struct in6_addr *)saddr)) | |
530 | continue; | |
531 | break; | |
532 | }; | |
533 | ||
534 | xfrm_state_hold(x); | |
535 | return x; | |
536 | } | |
537 | ||
538 | if (!create) | |
539 | return NULL; | |
540 | ||
541 | x = xfrm_state_alloc(); | |
542 | if (likely(x)) { | |
543 | switch (family) { | |
544 | case AF_INET: | |
545 | x->sel.daddr.a4 = daddr->a4; | |
546 | x->sel.saddr.a4 = saddr->a4; | |
547 | x->sel.prefixlen_d = 32; | |
548 | x->sel.prefixlen_s = 32; | |
549 | x->props.saddr.a4 = saddr->a4; | |
550 | x->id.daddr.a4 = daddr->a4; | |
551 | break; | |
552 | ||
553 | case AF_INET6: | |
554 | ipv6_addr_copy((struct in6_addr *)x->sel.daddr.a6, | |
555 | (struct in6_addr *)daddr); | |
556 | ipv6_addr_copy((struct in6_addr *)x->sel.saddr.a6, | |
557 | (struct in6_addr *)saddr); | |
558 | x->sel.prefixlen_d = 128; | |
559 | x->sel.prefixlen_s = 128; | |
560 | ipv6_addr_copy((struct in6_addr *)x->props.saddr.a6, | |
561 | (struct in6_addr *)saddr); | |
562 | ipv6_addr_copy((struct in6_addr *)x->id.daddr.a6, | |
563 | (struct in6_addr *)daddr); | |
564 | break; | |
565 | }; | |
566 | ||
567 | x->km.state = XFRM_STATE_ACQ; | |
568 | x->id.proto = proto; | |
569 | x->props.family = family; | |
570 | x->props.mode = mode; | |
571 | x->props.reqid = reqid; | |
572 | x->lft.hard_add_expires_seconds = XFRM_ACQ_EXPIRES; | |
573 | xfrm_state_hold(x); | |
574 | x->timer.expires = jiffies + XFRM_ACQ_EXPIRES*HZ; | |
575 | add_timer(&x->timer); | |
576 | xfrm_state_hold(x); | |
577 | list_add_tail(&x->bydst, xfrm_state_bydst+h); | |
578 | h = xfrm_src_hash(saddr, family); | |
579 | xfrm_state_hold(x); | |
580 | list_add_tail(&x->bysrc, xfrm_state_bysrc+h); | |
581 | wake_up(&km_waitq); | |
582 | } | |
583 | ||
584 | return x; | |
585 | } | |
586 | ||
eb2971b6 MN |
587 | static inline struct xfrm_state * |
588 | __xfrm_state_locate(struct xfrm_state_afinfo *afinfo, struct xfrm_state *x, | |
589 | int use_spi) | |
590 | { | |
591 | if (use_spi) | |
592 | return afinfo->state_lookup(&x->id.daddr, x->id.spi, x->id.proto); | |
593 | else | |
594 | return afinfo->state_lookup_byaddr(&x->id.daddr, &x->props.saddr, x->id.proto); | |
595 | } | |
596 | ||
1da177e4 LT |
597 | static struct xfrm_state *__xfrm_find_acq_byseq(u32 seq); |
598 | ||
599 | int xfrm_state_add(struct xfrm_state *x) | |
600 | { | |
601 | struct xfrm_state_afinfo *afinfo; | |
602 | struct xfrm_state *x1; | |
603 | int family; | |
604 | int err; | |
eb2971b6 | 605 | int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); |
1da177e4 LT |
606 | |
607 | family = x->props.family; | |
608 | afinfo = xfrm_state_get_afinfo(family); | |
609 | if (unlikely(afinfo == NULL)) | |
610 | return -EAFNOSUPPORT; | |
611 | ||
612 | spin_lock_bh(&xfrm_state_lock); | |
613 | ||
eb2971b6 | 614 | x1 = __xfrm_state_locate(afinfo, x, use_spi); |
1da177e4 LT |
615 | if (x1) { |
616 | xfrm_state_put(x1); | |
617 | x1 = NULL; | |
618 | err = -EEXIST; | |
619 | goto out; | |
620 | } | |
621 | ||
eb2971b6 | 622 | if (use_spi && x->km.seq) { |
1da177e4 LT |
623 | x1 = __xfrm_find_acq_byseq(x->km.seq); |
624 | if (x1 && xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family)) { | |
625 | xfrm_state_put(x1); | |
626 | x1 = NULL; | |
627 | } | |
628 | } | |
629 | ||
eb2971b6 | 630 | if (use_spi && !x1) |
2770834c DM |
631 | x1 = __find_acq_core(family, x->props.mode, x->props.reqid, |
632 | x->id.proto, | |
633 | &x->id.daddr, &x->props.saddr, 0); | |
1da177e4 LT |
634 | |
635 | __xfrm_state_insert(x); | |
636 | err = 0; | |
637 | ||
638 | out: | |
639 | spin_unlock_bh(&xfrm_state_lock); | |
640 | xfrm_state_put_afinfo(afinfo); | |
641 | ||
399c180a DM |
642 | if (!err) |
643 | xfrm_flush_all_bundles(); | |
644 | ||
1da177e4 LT |
645 | if (x1) { |
646 | xfrm_state_delete(x1); | |
647 | xfrm_state_put(x1); | |
648 | } | |
649 | ||
650 | return err; | |
651 | } | |
652 | EXPORT_SYMBOL(xfrm_state_add); | |
653 | ||
654 | int xfrm_state_update(struct xfrm_state *x) | |
655 | { | |
656 | struct xfrm_state_afinfo *afinfo; | |
657 | struct xfrm_state *x1; | |
658 | int err; | |
eb2971b6 | 659 | int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); |
1da177e4 LT |
660 | |
661 | afinfo = xfrm_state_get_afinfo(x->props.family); | |
662 | if (unlikely(afinfo == NULL)) | |
663 | return -EAFNOSUPPORT; | |
664 | ||
665 | spin_lock_bh(&xfrm_state_lock); | |
eb2971b6 | 666 | x1 = __xfrm_state_locate(afinfo, x, use_spi); |
1da177e4 LT |
667 | |
668 | err = -ESRCH; | |
669 | if (!x1) | |
670 | goto out; | |
671 | ||
672 | if (xfrm_state_kern(x1)) { | |
673 | xfrm_state_put(x1); | |
674 | err = -EEXIST; | |
675 | goto out; | |
676 | } | |
677 | ||
678 | if (x1->km.state == XFRM_STATE_ACQ) { | |
679 | __xfrm_state_insert(x); | |
680 | x = NULL; | |
681 | } | |
682 | err = 0; | |
683 | ||
684 | out: | |
685 | spin_unlock_bh(&xfrm_state_lock); | |
686 | xfrm_state_put_afinfo(afinfo); | |
687 | ||
688 | if (err) | |
689 | return err; | |
690 | ||
691 | if (!x) { | |
692 | xfrm_state_delete(x1); | |
693 | xfrm_state_put(x1); | |
694 | return 0; | |
695 | } | |
696 | ||
697 | err = -EINVAL; | |
698 | spin_lock_bh(&x1->lock); | |
699 | if (likely(x1->km.state == XFRM_STATE_VALID)) { | |
700 | if (x->encap && x1->encap) | |
701 | memcpy(x1->encap, x->encap, sizeof(*x1->encap)); | |
060f02a3 NT |
702 | if (x->coaddr && x1->coaddr) { |
703 | memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr)); | |
704 | } | |
705 | if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel))) | |
706 | memcpy(&x1->sel, &x->sel, sizeof(x1->sel)); | |
1da177e4 LT |
707 | memcpy(&x1->lft, &x->lft, sizeof(x1->lft)); |
708 | x1->km.dying = 0; | |
709 | ||
710 | if (!mod_timer(&x1->timer, jiffies + HZ)) | |
711 | xfrm_state_hold(x1); | |
712 | if (x1->curlft.use_time) | |
713 | xfrm_state_check_expire(x1); | |
714 | ||
715 | err = 0; | |
716 | } | |
717 | spin_unlock_bh(&x1->lock); | |
718 | ||
719 | xfrm_state_put(x1); | |
720 | ||
721 | return err; | |
722 | } | |
723 | EXPORT_SYMBOL(xfrm_state_update); | |
724 | ||
725 | int xfrm_state_check_expire(struct xfrm_state *x) | |
726 | { | |
727 | if (!x->curlft.use_time) | |
728 | x->curlft.use_time = (unsigned long)xtime.tv_sec; | |
729 | ||
730 | if (x->km.state != XFRM_STATE_VALID) | |
731 | return -EINVAL; | |
732 | ||
733 | if (x->curlft.bytes >= x->lft.hard_byte_limit || | |
734 | x->curlft.packets >= x->lft.hard_packet_limit) { | |
4666faab HX |
735 | x->km.state = XFRM_STATE_EXPIRED; |
736 | if (!mod_timer(&x->timer, jiffies)) | |
1da177e4 LT |
737 | xfrm_state_hold(x); |
738 | return -EINVAL; | |
739 | } | |
740 | ||
741 | if (!x->km.dying && | |
742 | (x->curlft.bytes >= x->lft.soft_byte_limit || | |
4666faab HX |
743 | x->curlft.packets >= x->lft.soft_packet_limit)) { |
744 | x->km.dying = 1; | |
53bc6b4d | 745 | km_state_expired(x, 0, 0); |
4666faab | 746 | } |
1da177e4 LT |
747 | return 0; |
748 | } | |
749 | EXPORT_SYMBOL(xfrm_state_check_expire); | |
750 | ||
751 | static int xfrm_state_check_space(struct xfrm_state *x, struct sk_buff *skb) | |
752 | { | |
753 | int nhead = x->props.header_len + LL_RESERVED_SPACE(skb->dst->dev) | |
754 | - skb_headroom(skb); | |
755 | ||
756 | if (nhead > 0) | |
757 | return pskb_expand_head(skb, nhead, 0, GFP_ATOMIC); | |
758 | ||
759 | /* Check tail too... */ | |
760 | return 0; | |
761 | } | |
762 | ||
763 | int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb) | |
764 | { | |
765 | int err = xfrm_state_check_expire(x); | |
766 | if (err < 0) | |
767 | goto err; | |
768 | err = xfrm_state_check_space(x, skb); | |
769 | err: | |
770 | return err; | |
771 | } | |
772 | EXPORT_SYMBOL(xfrm_state_check); | |
773 | ||
774 | struct xfrm_state * | |
775 | xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, | |
776 | unsigned short family) | |
777 | { | |
778 | struct xfrm_state *x; | |
779 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
780 | if (!afinfo) | |
781 | return NULL; | |
782 | ||
783 | spin_lock_bh(&xfrm_state_lock); | |
784 | x = afinfo->state_lookup(daddr, spi, proto); | |
785 | spin_unlock_bh(&xfrm_state_lock); | |
786 | xfrm_state_put_afinfo(afinfo); | |
787 | return x; | |
788 | } | |
789 | EXPORT_SYMBOL(xfrm_state_lookup); | |
790 | ||
791 | struct xfrm_state * | |
eb2971b6 MN |
792 | xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, |
793 | u8 proto, unsigned short family) | |
794 | { | |
795 | struct xfrm_state *x; | |
796 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
797 | if (!afinfo) | |
798 | return NULL; | |
799 | ||
800 | spin_lock_bh(&xfrm_state_lock); | |
801 | x = afinfo->state_lookup_byaddr(daddr, saddr, proto); | |
802 | spin_unlock_bh(&xfrm_state_lock); | |
803 | xfrm_state_put_afinfo(afinfo); | |
804 | return x; | |
805 | } | |
806 | EXPORT_SYMBOL(xfrm_state_lookup_byaddr); | |
807 | ||
808 | struct xfrm_state * | |
1da177e4 LT |
809 | xfrm_find_acq(u8 mode, u32 reqid, u8 proto, |
810 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
811 | int create, unsigned short family) | |
812 | { | |
813 | struct xfrm_state *x; | |
1da177e4 LT |
814 | |
815 | spin_lock_bh(&xfrm_state_lock); | |
2770834c | 816 | x = __find_acq_core(family, mode, reqid, proto, daddr, saddr, create); |
1da177e4 | 817 | spin_unlock_bh(&xfrm_state_lock); |
2770834c | 818 | |
1da177e4 LT |
819 | return x; |
820 | } | |
821 | EXPORT_SYMBOL(xfrm_find_acq); | |
822 | ||
41a49cc3 MN |
823 | #ifdef CONFIG_XFRM_SUB_POLICY |
824 | int | |
825 | xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, | |
826 | unsigned short family) | |
827 | { | |
828 | int err = 0; | |
829 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
830 | if (!afinfo) | |
831 | return -EAFNOSUPPORT; | |
832 | ||
833 | spin_lock_bh(&xfrm_state_lock); | |
834 | if (afinfo->tmpl_sort) | |
835 | err = afinfo->tmpl_sort(dst, src, n); | |
836 | spin_unlock_bh(&xfrm_state_lock); | |
837 | xfrm_state_put_afinfo(afinfo); | |
838 | return err; | |
839 | } | |
840 | EXPORT_SYMBOL(xfrm_tmpl_sort); | |
841 | ||
842 | int | |
843 | xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, | |
844 | unsigned short family) | |
845 | { | |
846 | int err = 0; | |
847 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
848 | if (!afinfo) | |
849 | return -EAFNOSUPPORT; | |
850 | ||
851 | spin_lock_bh(&xfrm_state_lock); | |
852 | if (afinfo->state_sort) | |
853 | err = afinfo->state_sort(dst, src, n); | |
854 | spin_unlock_bh(&xfrm_state_lock); | |
855 | xfrm_state_put_afinfo(afinfo); | |
856 | return err; | |
857 | } | |
858 | EXPORT_SYMBOL(xfrm_state_sort); | |
859 | #endif | |
860 | ||
1da177e4 LT |
861 | /* Silly enough, but I'm lazy to build resolution list */ |
862 | ||
863 | static struct xfrm_state *__xfrm_find_acq_byseq(u32 seq) | |
864 | { | |
865 | int i; | |
866 | struct xfrm_state *x; | |
867 | ||
868 | for (i = 0; i < XFRM_DST_HSIZE; i++) { | |
869 | list_for_each_entry(x, xfrm_state_bydst+i, bydst) { | |
870 | if (x->km.seq == seq && x->km.state == XFRM_STATE_ACQ) { | |
871 | xfrm_state_hold(x); | |
872 | return x; | |
873 | } | |
874 | } | |
875 | } | |
876 | return NULL; | |
877 | } | |
878 | ||
879 | struct xfrm_state *xfrm_find_acq_byseq(u32 seq) | |
880 | { | |
881 | struct xfrm_state *x; | |
882 | ||
883 | spin_lock_bh(&xfrm_state_lock); | |
884 | x = __xfrm_find_acq_byseq(seq); | |
885 | spin_unlock_bh(&xfrm_state_lock); | |
886 | return x; | |
887 | } | |
888 | EXPORT_SYMBOL(xfrm_find_acq_byseq); | |
889 | ||
890 | u32 xfrm_get_acqseq(void) | |
891 | { | |
892 | u32 res; | |
893 | static u32 acqseq; | |
894 | static DEFINE_SPINLOCK(acqseq_lock); | |
895 | ||
896 | spin_lock_bh(&acqseq_lock); | |
897 | res = (++acqseq ? : ++acqseq); | |
898 | spin_unlock_bh(&acqseq_lock); | |
899 | return res; | |
900 | } | |
901 | EXPORT_SYMBOL(xfrm_get_acqseq); | |
902 | ||
903 | void | |
904 | xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi) | |
905 | { | |
906 | u32 h; | |
907 | struct xfrm_state *x0; | |
908 | ||
909 | if (x->id.spi) | |
910 | return; | |
911 | ||
912 | if (minspi == maxspi) { | |
913 | x0 = xfrm_state_lookup(&x->id.daddr, minspi, x->id.proto, x->props.family); | |
914 | if (x0) { | |
915 | xfrm_state_put(x0); | |
916 | return; | |
917 | } | |
918 | x->id.spi = minspi; | |
919 | } else { | |
920 | u32 spi = 0; | |
921 | minspi = ntohl(minspi); | |
922 | maxspi = ntohl(maxspi); | |
923 | for (h=0; h<maxspi-minspi+1; h++) { | |
924 | spi = minspi + net_random()%(maxspi-minspi+1); | |
925 | x0 = xfrm_state_lookup(&x->id.daddr, htonl(spi), x->id.proto, x->props.family); | |
926 | if (x0 == NULL) { | |
927 | x->id.spi = htonl(spi); | |
928 | break; | |
929 | } | |
930 | xfrm_state_put(x0); | |
931 | } | |
932 | } | |
933 | if (x->id.spi) { | |
934 | spin_lock_bh(&xfrm_state_lock); | |
935 | h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, x->props.family); | |
936 | list_add(&x->byspi, xfrm_state_byspi+h); | |
937 | xfrm_state_hold(x); | |
938 | spin_unlock_bh(&xfrm_state_lock); | |
939 | wake_up(&km_waitq); | |
940 | } | |
941 | } | |
942 | EXPORT_SYMBOL(xfrm_alloc_spi); | |
943 | ||
944 | int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), | |
945 | void *data) | |
946 | { | |
947 | int i; | |
948 | struct xfrm_state *x; | |
949 | int count = 0; | |
950 | int err = 0; | |
951 | ||
952 | spin_lock_bh(&xfrm_state_lock); | |
953 | for (i = 0; i < XFRM_DST_HSIZE; i++) { | |
954 | list_for_each_entry(x, xfrm_state_bydst+i, bydst) { | |
5794708f | 955 | if (xfrm_id_proto_match(x->id.proto, proto)) |
1da177e4 LT |
956 | count++; |
957 | } | |
958 | } | |
959 | if (count == 0) { | |
960 | err = -ENOENT; | |
961 | goto out; | |
962 | } | |
963 | ||
964 | for (i = 0; i < XFRM_DST_HSIZE; i++) { | |
965 | list_for_each_entry(x, xfrm_state_bydst+i, bydst) { | |
5794708f | 966 | if (!xfrm_id_proto_match(x->id.proto, proto)) |
1da177e4 LT |
967 | continue; |
968 | err = func(x, --count, data); | |
969 | if (err) | |
970 | goto out; | |
971 | } | |
972 | } | |
973 | out: | |
974 | spin_unlock_bh(&xfrm_state_lock); | |
975 | return err; | |
976 | } | |
977 | EXPORT_SYMBOL(xfrm_state_walk); | |
978 | ||
f8cd5488 JHS |
979 | |
980 | void xfrm_replay_notify(struct xfrm_state *x, int event) | |
981 | { | |
982 | struct km_event c; | |
983 | /* we send notify messages in case | |
984 | * 1. we updated on of the sequence numbers, and the seqno difference | |
985 | * is at least x->replay_maxdiff, in this case we also update the | |
986 | * timeout of our timer function | |
987 | * 2. if x->replay_maxage has elapsed since last update, | |
988 | * and there were changes | |
989 | * | |
990 | * The state structure must be locked! | |
991 | */ | |
992 | ||
993 | switch (event) { | |
994 | case XFRM_REPLAY_UPDATE: | |
995 | if (x->replay_maxdiff && | |
996 | (x->replay.seq - x->preplay.seq < x->replay_maxdiff) && | |
2717096a JHS |
997 | (x->replay.oseq - x->preplay.oseq < x->replay_maxdiff)) { |
998 | if (x->xflags & XFRM_TIME_DEFER) | |
999 | event = XFRM_REPLAY_TIMEOUT; | |
1000 | else | |
1001 | return; | |
1002 | } | |
f8cd5488 JHS |
1003 | |
1004 | break; | |
1005 | ||
1006 | case XFRM_REPLAY_TIMEOUT: | |
1007 | if ((x->replay.seq == x->preplay.seq) && | |
1008 | (x->replay.bitmap == x->preplay.bitmap) && | |
2717096a JHS |
1009 | (x->replay.oseq == x->preplay.oseq)) { |
1010 | x->xflags |= XFRM_TIME_DEFER; | |
f8cd5488 | 1011 | return; |
2717096a | 1012 | } |
f8cd5488 JHS |
1013 | |
1014 | break; | |
1015 | } | |
1016 | ||
1017 | memcpy(&x->preplay, &x->replay, sizeof(struct xfrm_replay_state)); | |
1018 | c.event = XFRM_MSG_NEWAE; | |
1019 | c.data.aevent = event; | |
1020 | km_state_notify(x, &c); | |
1021 | ||
f8cd5488 | 1022 | if (x->replay_maxage && |
2717096a | 1023 | !mod_timer(&x->rtimer, jiffies + x->replay_maxage)) { |
f8cd5488 | 1024 | xfrm_state_hold(x); |
2717096a JHS |
1025 | x->xflags &= ~XFRM_TIME_DEFER; |
1026 | } | |
f8cd5488 | 1027 | } |
a70fcb0b | 1028 | EXPORT_SYMBOL(xfrm_replay_notify); |
f8cd5488 JHS |
1029 | |
1030 | static void xfrm_replay_timer_handler(unsigned long data) | |
1031 | { | |
1032 | struct xfrm_state *x = (struct xfrm_state*)data; | |
1033 | ||
1034 | spin_lock(&x->lock); | |
1035 | ||
2717096a JHS |
1036 | if (x->km.state == XFRM_STATE_VALID) { |
1037 | if (xfrm_aevent_is_on()) | |
1038 | xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT); | |
1039 | else | |
1040 | x->xflags |= XFRM_TIME_DEFER; | |
1041 | } | |
f8cd5488 JHS |
1042 | |
1043 | spin_unlock(&x->lock); | |
2717096a | 1044 | xfrm_state_put(x); |
f8cd5488 JHS |
1045 | } |
1046 | ||
1da177e4 LT |
1047 | int xfrm_replay_check(struct xfrm_state *x, u32 seq) |
1048 | { | |
1049 | u32 diff; | |
1050 | ||
1051 | seq = ntohl(seq); | |
1052 | ||
1053 | if (unlikely(seq == 0)) | |
1054 | return -EINVAL; | |
1055 | ||
1056 | if (likely(seq > x->replay.seq)) | |
1057 | return 0; | |
1058 | ||
1059 | diff = x->replay.seq - seq; | |
1060 | if (diff >= x->props.replay_window) { | |
1061 | x->stats.replay_window++; | |
1062 | return -EINVAL; | |
1063 | } | |
1064 | ||
1065 | if (x->replay.bitmap & (1U << diff)) { | |
1066 | x->stats.replay++; | |
1067 | return -EINVAL; | |
1068 | } | |
1069 | return 0; | |
1070 | } | |
1071 | EXPORT_SYMBOL(xfrm_replay_check); | |
1072 | ||
1073 | void xfrm_replay_advance(struct xfrm_state *x, u32 seq) | |
1074 | { | |
1075 | u32 diff; | |
1076 | ||
1077 | seq = ntohl(seq); | |
1078 | ||
1079 | if (seq > x->replay.seq) { | |
1080 | diff = seq - x->replay.seq; | |
1081 | if (diff < x->props.replay_window) | |
1082 | x->replay.bitmap = ((x->replay.bitmap) << diff) | 1; | |
1083 | else | |
1084 | x->replay.bitmap = 1; | |
1085 | x->replay.seq = seq; | |
1086 | } else { | |
1087 | diff = x->replay.seq - seq; | |
1088 | x->replay.bitmap |= (1U << diff); | |
1089 | } | |
f8cd5488 JHS |
1090 | |
1091 | if (xfrm_aevent_is_on()) | |
1092 | xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); | |
1da177e4 LT |
1093 | } |
1094 | EXPORT_SYMBOL(xfrm_replay_advance); | |
1095 | ||
1096 | static struct list_head xfrm_km_list = LIST_HEAD_INIT(xfrm_km_list); | |
1097 | static DEFINE_RWLOCK(xfrm_km_lock); | |
1098 | ||
26b15dad | 1099 | void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) |
1da177e4 LT |
1100 | { |
1101 | struct xfrm_mgr *km; | |
1102 | ||
26b15dad JHS |
1103 | read_lock(&xfrm_km_lock); |
1104 | list_for_each_entry(km, &xfrm_km_list, list) | |
1105 | if (km->notify_policy) | |
1106 | km->notify_policy(xp, dir, c); | |
1107 | read_unlock(&xfrm_km_lock); | |
1108 | } | |
1da177e4 | 1109 | |
26b15dad JHS |
1110 | void km_state_notify(struct xfrm_state *x, struct km_event *c) |
1111 | { | |
1112 | struct xfrm_mgr *km; | |
1da177e4 LT |
1113 | read_lock(&xfrm_km_lock); |
1114 | list_for_each_entry(km, &xfrm_km_list, list) | |
26b15dad JHS |
1115 | if (km->notify) |
1116 | km->notify(x, c); | |
1da177e4 | 1117 | read_unlock(&xfrm_km_lock); |
26b15dad JHS |
1118 | } |
1119 | ||
1120 | EXPORT_SYMBOL(km_policy_notify); | |
1121 | EXPORT_SYMBOL(km_state_notify); | |
1122 | ||
53bc6b4d | 1123 | void km_state_expired(struct xfrm_state *x, int hard, u32 pid) |
26b15dad JHS |
1124 | { |
1125 | struct km_event c; | |
1126 | ||
bf08867f | 1127 | c.data.hard = hard; |
53bc6b4d | 1128 | c.pid = pid; |
f60f6b8f | 1129 | c.event = XFRM_MSG_EXPIRE; |
26b15dad | 1130 | km_state_notify(x, &c); |
1da177e4 LT |
1131 | |
1132 | if (hard) | |
1133 | wake_up(&km_waitq); | |
1134 | } | |
1135 | ||
53bc6b4d | 1136 | EXPORT_SYMBOL(km_state_expired); |
26b15dad JHS |
1137 | /* |
1138 | * We send to all registered managers regardless of failure | |
1139 | * We are happy with one success | |
1140 | */ | |
980ebd25 | 1141 | int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol) |
1da177e4 | 1142 | { |
26b15dad | 1143 | int err = -EINVAL, acqret; |
1da177e4 LT |
1144 | struct xfrm_mgr *km; |
1145 | ||
1146 | read_lock(&xfrm_km_lock); | |
1147 | list_for_each_entry(km, &xfrm_km_list, list) { | |
26b15dad JHS |
1148 | acqret = km->acquire(x, t, pol, XFRM_POLICY_OUT); |
1149 | if (!acqret) | |
1150 | err = acqret; | |
1da177e4 LT |
1151 | } |
1152 | read_unlock(&xfrm_km_lock); | |
1153 | return err; | |
1154 | } | |
980ebd25 | 1155 | EXPORT_SYMBOL(km_query); |
1da177e4 LT |
1156 | |
1157 | int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport) | |
1158 | { | |
1159 | int err = -EINVAL; | |
1160 | struct xfrm_mgr *km; | |
1161 | ||
1162 | read_lock(&xfrm_km_lock); | |
1163 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1164 | if (km->new_mapping) | |
1165 | err = km->new_mapping(x, ipaddr, sport); | |
1166 | if (!err) | |
1167 | break; | |
1168 | } | |
1169 | read_unlock(&xfrm_km_lock); | |
1170 | return err; | |
1171 | } | |
1172 | EXPORT_SYMBOL(km_new_mapping); | |
1173 | ||
6c5c8ca7 | 1174 | void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid) |
1da177e4 | 1175 | { |
26b15dad | 1176 | struct km_event c; |
1da177e4 | 1177 | |
bf08867f | 1178 | c.data.hard = hard; |
6c5c8ca7 | 1179 | c.pid = pid; |
f60f6b8f | 1180 | c.event = XFRM_MSG_POLEXPIRE; |
26b15dad | 1181 | km_policy_notify(pol, dir, &c); |
1da177e4 LT |
1182 | |
1183 | if (hard) | |
1184 | wake_up(&km_waitq); | |
1185 | } | |
a70fcb0b | 1186 | EXPORT_SYMBOL(km_policy_expired); |
1da177e4 | 1187 | |
97a64b45 MN |
1188 | int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr) |
1189 | { | |
1190 | int err = -EINVAL; | |
1191 | int ret; | |
1192 | struct xfrm_mgr *km; | |
1193 | ||
1194 | read_lock(&xfrm_km_lock); | |
1195 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1196 | if (km->report) { | |
1197 | ret = km->report(proto, sel, addr); | |
1198 | if (!ret) | |
1199 | err = ret; | |
1200 | } | |
1201 | } | |
1202 | read_unlock(&xfrm_km_lock); | |
1203 | return err; | |
1204 | } | |
1205 | EXPORT_SYMBOL(km_report); | |
1206 | ||
1da177e4 LT |
1207 | int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) |
1208 | { | |
1209 | int err; | |
1210 | u8 *data; | |
1211 | struct xfrm_mgr *km; | |
1212 | struct xfrm_policy *pol = NULL; | |
1213 | ||
1214 | if (optlen <= 0 || optlen > PAGE_SIZE) | |
1215 | return -EMSGSIZE; | |
1216 | ||
1217 | data = kmalloc(optlen, GFP_KERNEL); | |
1218 | if (!data) | |
1219 | return -ENOMEM; | |
1220 | ||
1221 | err = -EFAULT; | |
1222 | if (copy_from_user(data, optval, optlen)) | |
1223 | goto out; | |
1224 | ||
1225 | err = -EINVAL; | |
1226 | read_lock(&xfrm_km_lock); | |
1227 | list_for_each_entry(km, &xfrm_km_list, list) { | |
cb969f07 | 1228 | pol = km->compile_policy(sk, optname, data, |
1da177e4 LT |
1229 | optlen, &err); |
1230 | if (err >= 0) | |
1231 | break; | |
1232 | } | |
1233 | read_unlock(&xfrm_km_lock); | |
1234 | ||
1235 | if (err >= 0) { | |
1236 | xfrm_sk_policy_insert(sk, err, pol); | |
1237 | xfrm_pol_put(pol); | |
1238 | err = 0; | |
1239 | } | |
1240 | ||
1241 | out: | |
1242 | kfree(data); | |
1243 | return err; | |
1244 | } | |
1245 | EXPORT_SYMBOL(xfrm_user_policy); | |
1246 | ||
1247 | int xfrm_register_km(struct xfrm_mgr *km) | |
1248 | { | |
1249 | write_lock_bh(&xfrm_km_lock); | |
1250 | list_add_tail(&km->list, &xfrm_km_list); | |
1251 | write_unlock_bh(&xfrm_km_lock); | |
1252 | return 0; | |
1253 | } | |
1254 | EXPORT_SYMBOL(xfrm_register_km); | |
1255 | ||
1256 | int xfrm_unregister_km(struct xfrm_mgr *km) | |
1257 | { | |
1258 | write_lock_bh(&xfrm_km_lock); | |
1259 | list_del(&km->list); | |
1260 | write_unlock_bh(&xfrm_km_lock); | |
1261 | return 0; | |
1262 | } | |
1263 | EXPORT_SYMBOL(xfrm_unregister_km); | |
1264 | ||
1265 | int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo) | |
1266 | { | |
1267 | int err = 0; | |
1268 | if (unlikely(afinfo == NULL)) | |
1269 | return -EINVAL; | |
1270 | if (unlikely(afinfo->family >= NPROTO)) | |
1271 | return -EAFNOSUPPORT; | |
f3111502 | 1272 | write_lock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1273 | if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL)) |
1274 | err = -ENOBUFS; | |
1275 | else { | |
6c44e6b7 | 1276 | afinfo->state_bysrc = xfrm_state_bysrc; |
1da177e4 LT |
1277 | afinfo->state_byspi = xfrm_state_byspi; |
1278 | xfrm_state_afinfo[afinfo->family] = afinfo; | |
1279 | } | |
f3111502 | 1280 | write_unlock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1281 | return err; |
1282 | } | |
1283 | EXPORT_SYMBOL(xfrm_state_register_afinfo); | |
1284 | ||
1285 | int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo) | |
1286 | { | |
1287 | int err = 0; | |
1288 | if (unlikely(afinfo == NULL)) | |
1289 | return -EINVAL; | |
1290 | if (unlikely(afinfo->family >= NPROTO)) | |
1291 | return -EAFNOSUPPORT; | |
f3111502 | 1292 | write_lock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1293 | if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) { |
1294 | if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo)) | |
1295 | err = -EINVAL; | |
1296 | else { | |
1297 | xfrm_state_afinfo[afinfo->family] = NULL; | |
1298 | afinfo->state_byspi = NULL; | |
6c44e6b7 | 1299 | afinfo->state_bysrc = NULL; |
1da177e4 LT |
1300 | } |
1301 | } | |
f3111502 | 1302 | write_unlock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1303 | return err; |
1304 | } | |
1305 | EXPORT_SYMBOL(xfrm_state_unregister_afinfo); | |
1306 | ||
1307 | static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family) | |
1308 | { | |
1309 | struct xfrm_state_afinfo *afinfo; | |
1310 | if (unlikely(family >= NPROTO)) | |
1311 | return NULL; | |
1312 | read_lock(&xfrm_state_afinfo_lock); | |
1313 | afinfo = xfrm_state_afinfo[family]; | |
546be240 HX |
1314 | if (unlikely(!afinfo)) |
1315 | read_unlock(&xfrm_state_afinfo_lock); | |
1da177e4 LT |
1316 | return afinfo; |
1317 | } | |
1318 | ||
1319 | static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo) | |
1320 | { | |
546be240 | 1321 | read_unlock(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1322 | } |
1323 | ||
1324 | /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */ | |
1325 | void xfrm_state_delete_tunnel(struct xfrm_state *x) | |
1326 | { | |
1327 | if (x->tunnel) { | |
1328 | struct xfrm_state *t = x->tunnel; | |
1329 | ||
1330 | if (atomic_read(&t->tunnel_users) == 2) | |
1331 | xfrm_state_delete(t); | |
1332 | atomic_dec(&t->tunnel_users); | |
1333 | xfrm_state_put(t); | |
1334 | x->tunnel = NULL; | |
1335 | } | |
1336 | } | |
1337 | EXPORT_SYMBOL(xfrm_state_delete_tunnel); | |
1338 | ||
80b30c10 HX |
1339 | /* |
1340 | * This function is NOT optimal. For example, with ESP it will give an | |
1341 | * MTU that's usually two bytes short of being optimal. However, it will | |
1342 | * usually give an answer that's a multiple of 4 provided the input is | |
1343 | * also a multiple of 4. | |
1344 | */ | |
1da177e4 LT |
1345 | int xfrm_state_mtu(struct xfrm_state *x, int mtu) |
1346 | { | |
1347 | int res = mtu; | |
1348 | ||
1349 | res -= x->props.header_len; | |
1350 | ||
1351 | for (;;) { | |
1352 | int m = res; | |
1353 | ||
1354 | if (m < 68) | |
1355 | return 68; | |
1356 | ||
1357 | spin_lock_bh(&x->lock); | |
1358 | if (x->km.state == XFRM_STATE_VALID && | |
1359 | x->type && x->type->get_max_size) | |
1360 | m = x->type->get_max_size(x, m); | |
1361 | else | |
1362 | m += x->props.header_len; | |
1363 | spin_unlock_bh(&x->lock); | |
1364 | ||
1365 | if (m <= mtu) | |
1366 | break; | |
1367 | res -= (m - mtu); | |
1368 | } | |
1369 | ||
1370 | return res; | |
1371 | } | |
1372 | ||
72cb6962 HX |
1373 | int xfrm_init_state(struct xfrm_state *x) |
1374 | { | |
d094cd83 HX |
1375 | struct xfrm_state_afinfo *afinfo; |
1376 | int family = x->props.family; | |
72cb6962 HX |
1377 | int err; |
1378 | ||
d094cd83 HX |
1379 | err = -EAFNOSUPPORT; |
1380 | afinfo = xfrm_state_get_afinfo(family); | |
1381 | if (!afinfo) | |
1382 | goto error; | |
1383 | ||
1384 | err = 0; | |
1385 | if (afinfo->init_flags) | |
1386 | err = afinfo->init_flags(x); | |
1387 | ||
1388 | xfrm_state_put_afinfo(afinfo); | |
1389 | ||
1390 | if (err) | |
1391 | goto error; | |
1392 | ||
1393 | err = -EPROTONOSUPPORT; | |
1394 | x->type = xfrm_get_type(x->id.proto, family); | |
72cb6962 HX |
1395 | if (x->type == NULL) |
1396 | goto error; | |
1397 | ||
1398 | err = x->type->init_state(x); | |
1399 | if (err) | |
1400 | goto error; | |
1401 | ||
b59f45d0 HX |
1402 | x->mode = xfrm_get_mode(x->props.mode, family); |
1403 | if (x->mode == NULL) | |
1404 | goto error; | |
1405 | ||
72cb6962 HX |
1406 | x->km.state = XFRM_STATE_VALID; |
1407 | ||
1408 | error: | |
1409 | return err; | |
1410 | } | |
1411 | ||
1412 | EXPORT_SYMBOL(xfrm_init_state); | |
1da177e4 LT |
1413 | |
1414 | void __init xfrm_state_init(void) | |
1415 | { | |
1416 | int i; | |
1417 | ||
1418 | for (i=0; i<XFRM_DST_HSIZE; i++) { | |
1419 | INIT_LIST_HEAD(&xfrm_state_bydst[i]); | |
6c44e6b7 | 1420 | INIT_LIST_HEAD(&xfrm_state_bysrc[i]); |
1da177e4 LT |
1421 | INIT_LIST_HEAD(&xfrm_state_byspi[i]); |
1422 | } | |
1423 | INIT_WORK(&xfrm_state_gc_work, xfrm_state_gc_task, NULL); | |
1424 | } | |
1425 |