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