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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> | |
f034b5d4 DM |
21 | #include <linux/bootmem.h> |
22 | #include <linux/vmalloc.h> | |
23 | #include <linux/cache.h> | |
1da177e4 LT |
24 | #include <asm/uaccess.h> |
25 | ||
ee857a7d DM |
26 | struct sock *xfrm_nl; |
27 | EXPORT_SYMBOL(xfrm_nl); | |
28 | ||
f8cd5488 | 29 | u32 sysctl_xfrm_aevent_etime = XFRM_AE_ETIME; |
a70fcb0b DM |
30 | EXPORT_SYMBOL(sysctl_xfrm_aevent_etime); |
31 | ||
f8cd5488 | 32 | u32 sysctl_xfrm_aevent_rseqth = XFRM_AE_SEQT_SIZE; |
a70fcb0b DM |
33 | EXPORT_SYMBOL(sysctl_xfrm_aevent_rseqth); |
34 | ||
1da177e4 LT |
35 | /* Each xfrm_state may be linked to two tables: |
36 | ||
37 | 1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl) | |
38 | 2. Hash table by daddr to find what SAs exist for given | |
39 | destination/tunnel endpoint. (output) | |
40 | */ | |
41 | ||
42 | static DEFINE_SPINLOCK(xfrm_state_lock); | |
43 | ||
44 | /* Hash table to find appropriate SA towards given target (endpoint | |
45 | * of tunnel or destination of transport mode) allowed by selector. | |
46 | * | |
47 | * Main use is finding SA after policy selected tunnel or transport mode. | |
48 | * Also, it can be used by ah/esp icmp error handler to find offending SA. | |
49 | */ | |
f034b5d4 DM |
50 | static struct hlist_head *xfrm_state_bydst __read_mostly; |
51 | static struct hlist_head *xfrm_state_bysrc __read_mostly; | |
52 | static struct hlist_head *xfrm_state_byspi __read_mostly; | |
53 | static unsigned int xfrm_state_hmask __read_mostly; | |
54 | static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024; | |
55 | static unsigned int xfrm_state_num; | |
56 | ||
57 | static inline unsigned int __xfrm4_dst_hash(xfrm_address_t *addr, unsigned int hmask) | |
edcd5821 | 58 | { |
f034b5d4 | 59 | unsigned int h; |
edcd5821 | 60 | h = ntohl(addr->a4); |
f034b5d4 | 61 | h = (h ^ (h>>16)) & hmask; |
edcd5821 DM |
62 | return h; |
63 | } | |
64 | ||
f034b5d4 | 65 | static inline unsigned int __xfrm6_dst_hash(xfrm_address_t *addr, unsigned int hmask) |
edcd5821 | 66 | { |
f034b5d4 | 67 | unsigned int h; |
edcd5821 | 68 | h = ntohl(addr->a6[2]^addr->a6[3]); |
f034b5d4 | 69 | h = (h ^ (h>>16)) & hmask; |
edcd5821 DM |
70 | return h; |
71 | } | |
72 | ||
f034b5d4 | 73 | static inline unsigned int __xfrm4_src_hash(xfrm_address_t *addr, unsigned int hmask) |
edcd5821 | 74 | { |
f034b5d4 | 75 | return __xfrm4_dst_hash(addr, hmask); |
edcd5821 DM |
76 | } |
77 | ||
f034b5d4 | 78 | static inline unsigned int __xfrm6_src_hash(xfrm_address_t *addr, unsigned int hmask) |
edcd5821 | 79 | { |
f034b5d4 | 80 | return __xfrm6_dst_hash(addr, hmask); |
edcd5821 DM |
81 | } |
82 | ||
f034b5d4 | 83 | static inline unsigned __xfrm_src_hash(xfrm_address_t *addr, unsigned short family, unsigned int hmask) |
edcd5821 DM |
84 | { |
85 | switch (family) { | |
86 | case AF_INET: | |
f034b5d4 | 87 | return __xfrm4_src_hash(addr, hmask); |
edcd5821 | 88 | case AF_INET6: |
f034b5d4 | 89 | return __xfrm6_src_hash(addr, hmask); |
edcd5821 DM |
90 | } |
91 | return 0; | |
92 | } | |
93 | ||
f034b5d4 DM |
94 | static inline unsigned xfrm_src_hash(xfrm_address_t *addr, unsigned short family) |
95 | { | |
96 | return __xfrm_src_hash(addr, family, xfrm_state_hmask); | |
97 | } | |
98 | ||
99 | static inline unsigned int __xfrm_dst_hash(xfrm_address_t *addr, unsigned short family, unsigned int hmask) | |
2770834c DM |
100 | { |
101 | switch (family) { | |
102 | case AF_INET: | |
f034b5d4 | 103 | return __xfrm4_dst_hash(addr, hmask); |
2770834c | 104 | case AF_INET6: |
f034b5d4 | 105 | return __xfrm6_dst_hash(addr, hmask); |
2770834c DM |
106 | } |
107 | return 0; | |
108 | } | |
109 | ||
f034b5d4 DM |
110 | static inline unsigned int xfrm_dst_hash(xfrm_address_t *addr, unsigned short family) |
111 | { | |
112 | return __xfrm_dst_hash(addr, family, xfrm_state_hmask); | |
113 | } | |
114 | ||
115 | static inline unsigned int __xfrm4_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, | |
116 | unsigned int hmask) | |
edcd5821 | 117 | { |
f034b5d4 | 118 | unsigned int h; |
edcd5821 | 119 | h = ntohl(addr->a4^spi^proto); |
f034b5d4 | 120 | h = (h ^ (h>>10) ^ (h>>20)) & hmask; |
edcd5821 DM |
121 | return h; |
122 | } | |
123 | ||
f034b5d4 DM |
124 | static inline unsigned int __xfrm6_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, |
125 | unsigned int hmask) | |
edcd5821 | 126 | { |
f034b5d4 | 127 | unsigned int h; |
edcd5821 | 128 | h = ntohl(addr->a6[2]^addr->a6[3]^spi^proto); |
f034b5d4 | 129 | h = (h ^ (h>>10) ^ (h>>20)) & hmask; |
edcd5821 DM |
130 | return h; |
131 | } | |
132 | ||
f034b5d4 DM |
133 | static inline |
134 | unsigned __xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family, | |
135 | unsigned int hmask) | |
edcd5821 DM |
136 | { |
137 | switch (family) { | |
138 | case AF_INET: | |
f034b5d4 | 139 | return __xfrm4_spi_hash(addr, spi, proto, hmask); |
edcd5821 | 140 | case AF_INET6: |
f034b5d4 | 141 | return __xfrm6_spi_hash(addr, spi, proto, hmask); |
edcd5821 DM |
142 | } |
143 | return 0; /*XXX*/ | |
144 | } | |
145 | ||
f034b5d4 DM |
146 | static inline unsigned int |
147 | xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family) | |
148 | { | |
149 | return __xfrm_spi_hash(addr, spi, proto, family, xfrm_state_hmask); | |
150 | } | |
151 | ||
152 | static struct hlist_head *xfrm_state_hash_alloc(unsigned int sz) | |
153 | { | |
154 | struct hlist_head *n; | |
155 | ||
156 | if (sz <= PAGE_SIZE) | |
157 | n = kmalloc(sz, GFP_KERNEL); | |
158 | else if (hashdist) | |
159 | n = __vmalloc(sz, GFP_KERNEL, PAGE_KERNEL); | |
160 | else | |
161 | n = (struct hlist_head *) | |
162 | __get_free_pages(GFP_KERNEL, get_order(sz)); | |
163 | ||
164 | if (n) | |
165 | memset(n, 0, sz); | |
166 | ||
167 | return n; | |
168 | } | |
169 | ||
170 | static void xfrm_state_hash_free(struct hlist_head *n, unsigned int sz) | |
171 | { | |
172 | if (sz <= PAGE_SIZE) | |
173 | kfree(n); | |
174 | else if (hashdist) | |
175 | vfree(n); | |
176 | else | |
177 | free_pages((unsigned long)n, get_order(sz)); | |
178 | } | |
179 | ||
180 | static void xfrm_hash_transfer(struct hlist_head *list, | |
181 | struct hlist_head *ndsttable, | |
182 | struct hlist_head *nsrctable, | |
183 | struct hlist_head *nspitable, | |
184 | unsigned int nhashmask) | |
185 | { | |
186 | struct hlist_node *entry, *tmp; | |
187 | struct xfrm_state *x; | |
188 | ||
189 | hlist_for_each_entry_safe(x, entry, tmp, list, bydst) { | |
190 | unsigned int h; | |
191 | ||
192 | h = __xfrm_dst_hash(&x->id.daddr, x->props.family, nhashmask); | |
193 | hlist_add_head(&x->bydst, ndsttable+h); | |
194 | ||
195 | h = __xfrm_src_hash(&x->props.saddr, x->props.family, | |
196 | nhashmask); | |
197 | hlist_add_head(&x->bysrc, nsrctable+h); | |
198 | ||
199 | h = __xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, | |
200 | x->props.family, nhashmask); | |
201 | hlist_add_head(&x->byspi, nspitable+h); | |
202 | } | |
203 | } | |
204 | ||
205 | static unsigned long xfrm_hash_new_size(void) | |
206 | { | |
207 | return ((xfrm_state_hmask + 1) << 1) * | |
208 | sizeof(struct hlist_head); | |
209 | } | |
210 | ||
211 | static DEFINE_MUTEX(hash_resize_mutex); | |
212 | ||
213 | static void xfrm_hash_resize(void *__unused) | |
214 | { | |
215 | struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi; | |
216 | unsigned long nsize, osize; | |
217 | unsigned int nhashmask, ohashmask; | |
218 | int i; | |
219 | ||
220 | mutex_lock(&hash_resize_mutex); | |
221 | ||
222 | nsize = xfrm_hash_new_size(); | |
223 | ndst = xfrm_state_hash_alloc(nsize); | |
224 | if (!ndst) | |
225 | goto out_unlock; | |
226 | nsrc = xfrm_state_hash_alloc(nsize); | |
227 | if (!nsrc) { | |
228 | xfrm_state_hash_free(ndst, nsize); | |
229 | goto out_unlock; | |
230 | } | |
231 | nspi = xfrm_state_hash_alloc(nsize); | |
232 | if (!nspi) { | |
233 | xfrm_state_hash_free(ndst, nsize); | |
234 | xfrm_state_hash_free(nsrc, nsize); | |
235 | goto out_unlock; | |
236 | } | |
237 | ||
238 | spin_lock_bh(&xfrm_state_lock); | |
239 | ||
240 | nhashmask = (nsize / sizeof(struct hlist_head)) - 1U; | |
241 | for (i = xfrm_state_hmask; i >= 0; i--) | |
242 | xfrm_hash_transfer(xfrm_state_bydst+i, ndst, nsrc, nspi, | |
243 | nhashmask); | |
244 | ||
245 | odst = xfrm_state_bydst; | |
246 | osrc = xfrm_state_bysrc; | |
247 | ospi = xfrm_state_byspi; | |
248 | ohashmask = xfrm_state_hmask; | |
249 | ||
250 | xfrm_state_bydst = ndst; | |
251 | xfrm_state_bysrc = nsrc; | |
252 | xfrm_state_byspi = nspi; | |
253 | xfrm_state_hmask = nhashmask; | |
254 | ||
255 | spin_unlock_bh(&xfrm_state_lock); | |
256 | ||
257 | osize = (ohashmask + 1) * sizeof(struct hlist_head); | |
258 | xfrm_state_hash_free(odst, osize); | |
259 | xfrm_state_hash_free(osrc, osize); | |
260 | xfrm_state_hash_free(ospi, osize); | |
261 | ||
262 | out_unlock: | |
263 | mutex_unlock(&hash_resize_mutex); | |
264 | } | |
265 | ||
266 | static DECLARE_WORK(xfrm_hash_work, xfrm_hash_resize, NULL); | |
267 | ||
1da177e4 LT |
268 | DECLARE_WAIT_QUEUE_HEAD(km_waitq); |
269 | EXPORT_SYMBOL(km_waitq); | |
270 | ||
271 | static DEFINE_RWLOCK(xfrm_state_afinfo_lock); | |
272 | static struct xfrm_state_afinfo *xfrm_state_afinfo[NPROTO]; | |
273 | ||
274 | static struct work_struct xfrm_state_gc_work; | |
8f126e37 | 275 | static HLIST_HEAD(xfrm_state_gc_list); |
1da177e4 LT |
276 | static DEFINE_SPINLOCK(xfrm_state_gc_lock); |
277 | ||
278 | static int xfrm_state_gc_flush_bundles; | |
279 | ||
53bc6b4d | 280 | int __xfrm_state_delete(struct xfrm_state *x); |
1da177e4 LT |
281 | |
282 | static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family); | |
283 | static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo); | |
284 | ||
980ebd25 | 285 | int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); |
53bc6b4d | 286 | void km_state_expired(struct xfrm_state *x, int hard, u32 pid); |
1da177e4 LT |
287 | |
288 | static void xfrm_state_gc_destroy(struct xfrm_state *x) | |
289 | { | |
290 | if (del_timer(&x->timer)) | |
291 | BUG(); | |
f8cd5488 JHS |
292 | if (del_timer(&x->rtimer)) |
293 | BUG(); | |
a51482bd JJ |
294 | kfree(x->aalg); |
295 | kfree(x->ealg); | |
296 | kfree(x->calg); | |
297 | kfree(x->encap); | |
060f02a3 | 298 | kfree(x->coaddr); |
b59f45d0 HX |
299 | if (x->mode) |
300 | xfrm_put_mode(x->mode); | |
1da177e4 LT |
301 | if (x->type) { |
302 | x->type->destructor(x); | |
303 | xfrm_put_type(x->type); | |
304 | } | |
df71837d | 305 | security_xfrm_state_free(x); |
1da177e4 LT |
306 | kfree(x); |
307 | } | |
308 | ||
309 | static void xfrm_state_gc_task(void *data) | |
310 | { | |
311 | struct xfrm_state *x; | |
8f126e37 DM |
312 | struct hlist_node *entry, *tmp; |
313 | struct hlist_head gc_list; | |
1da177e4 LT |
314 | |
315 | if (xfrm_state_gc_flush_bundles) { | |
316 | xfrm_state_gc_flush_bundles = 0; | |
317 | xfrm_flush_bundles(); | |
318 | } | |
319 | ||
320 | spin_lock_bh(&xfrm_state_gc_lock); | |
8f126e37 DM |
321 | gc_list.first = xfrm_state_gc_list.first; |
322 | INIT_HLIST_HEAD(&xfrm_state_gc_list); | |
1da177e4 LT |
323 | spin_unlock_bh(&xfrm_state_gc_lock); |
324 | ||
8f126e37 | 325 | hlist_for_each_entry_safe(x, entry, tmp, &gc_list, bydst) |
1da177e4 | 326 | xfrm_state_gc_destroy(x); |
8f126e37 | 327 | |
1da177e4 LT |
328 | wake_up(&km_waitq); |
329 | } | |
330 | ||
331 | static inline unsigned long make_jiffies(long secs) | |
332 | { | |
333 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
334 | return MAX_SCHEDULE_TIMEOUT-1; | |
335 | else | |
336 | return secs*HZ; | |
337 | } | |
338 | ||
339 | static void xfrm_timer_handler(unsigned long data) | |
340 | { | |
341 | struct xfrm_state *x = (struct xfrm_state*)data; | |
342 | unsigned long now = (unsigned long)xtime.tv_sec; | |
343 | long next = LONG_MAX; | |
344 | int warn = 0; | |
345 | ||
346 | spin_lock(&x->lock); | |
347 | if (x->km.state == XFRM_STATE_DEAD) | |
348 | goto out; | |
349 | if (x->km.state == XFRM_STATE_EXPIRED) | |
350 | goto expired; | |
351 | if (x->lft.hard_add_expires_seconds) { | |
352 | long tmo = x->lft.hard_add_expires_seconds + | |
353 | x->curlft.add_time - now; | |
354 | if (tmo <= 0) | |
355 | goto expired; | |
356 | if (tmo < next) | |
357 | next = tmo; | |
358 | } | |
359 | if (x->lft.hard_use_expires_seconds) { | |
360 | long tmo = x->lft.hard_use_expires_seconds + | |
361 | (x->curlft.use_time ? : now) - now; | |
362 | if (tmo <= 0) | |
363 | goto expired; | |
364 | if (tmo < next) | |
365 | next = tmo; | |
366 | } | |
367 | if (x->km.dying) | |
368 | goto resched; | |
369 | if (x->lft.soft_add_expires_seconds) { | |
370 | long tmo = x->lft.soft_add_expires_seconds + | |
371 | x->curlft.add_time - now; | |
372 | if (tmo <= 0) | |
373 | warn = 1; | |
374 | else if (tmo < next) | |
375 | next = tmo; | |
376 | } | |
377 | if (x->lft.soft_use_expires_seconds) { | |
378 | long tmo = x->lft.soft_use_expires_seconds + | |
379 | (x->curlft.use_time ? : now) - now; | |
380 | if (tmo <= 0) | |
381 | warn = 1; | |
382 | else if (tmo < next) | |
383 | next = tmo; | |
384 | } | |
385 | ||
4666faab | 386 | x->km.dying = warn; |
1da177e4 | 387 | if (warn) |
53bc6b4d | 388 | km_state_expired(x, 0, 0); |
1da177e4 LT |
389 | resched: |
390 | if (next != LONG_MAX && | |
391 | !mod_timer(&x->timer, jiffies + make_jiffies(next))) | |
392 | xfrm_state_hold(x); | |
393 | goto out; | |
394 | ||
395 | expired: | |
396 | if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) { | |
397 | x->km.state = XFRM_STATE_EXPIRED; | |
398 | wake_up(&km_waitq); | |
399 | next = 2; | |
400 | goto resched; | |
401 | } | |
4666faab | 402 | if (!__xfrm_state_delete(x) && x->id.spi) |
53bc6b4d | 403 | km_state_expired(x, 1, 0); |
1da177e4 LT |
404 | |
405 | out: | |
406 | spin_unlock(&x->lock); | |
407 | xfrm_state_put(x); | |
408 | } | |
409 | ||
0ac84752 DM |
410 | static void xfrm_replay_timer_handler(unsigned long data); |
411 | ||
1da177e4 LT |
412 | struct xfrm_state *xfrm_state_alloc(void) |
413 | { | |
414 | struct xfrm_state *x; | |
415 | ||
0da974f4 | 416 | x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC); |
1da177e4 LT |
417 | |
418 | if (x) { | |
1da177e4 LT |
419 | atomic_set(&x->refcnt, 1); |
420 | atomic_set(&x->tunnel_users, 0); | |
8f126e37 DM |
421 | INIT_HLIST_NODE(&x->bydst); |
422 | INIT_HLIST_NODE(&x->bysrc); | |
423 | INIT_HLIST_NODE(&x->byspi); | |
1da177e4 LT |
424 | init_timer(&x->timer); |
425 | x->timer.function = xfrm_timer_handler; | |
426 | x->timer.data = (unsigned long)x; | |
f8cd5488 JHS |
427 | init_timer(&x->rtimer); |
428 | x->rtimer.function = xfrm_replay_timer_handler; | |
429 | x->rtimer.data = (unsigned long)x; | |
1da177e4 LT |
430 | x->curlft.add_time = (unsigned long)xtime.tv_sec; |
431 | x->lft.soft_byte_limit = XFRM_INF; | |
432 | x->lft.soft_packet_limit = XFRM_INF; | |
433 | x->lft.hard_byte_limit = XFRM_INF; | |
434 | x->lft.hard_packet_limit = XFRM_INF; | |
f8cd5488 JHS |
435 | x->replay_maxage = 0; |
436 | x->replay_maxdiff = 0; | |
1da177e4 LT |
437 | spin_lock_init(&x->lock); |
438 | } | |
439 | return x; | |
440 | } | |
441 | EXPORT_SYMBOL(xfrm_state_alloc); | |
442 | ||
443 | void __xfrm_state_destroy(struct xfrm_state *x) | |
444 | { | |
445 | BUG_TRAP(x->km.state == XFRM_STATE_DEAD); | |
446 | ||
447 | spin_lock_bh(&xfrm_state_gc_lock); | |
8f126e37 | 448 | hlist_add_head(&x->bydst, &xfrm_state_gc_list); |
1da177e4 LT |
449 | spin_unlock_bh(&xfrm_state_gc_lock); |
450 | schedule_work(&xfrm_state_gc_work); | |
451 | } | |
452 | EXPORT_SYMBOL(__xfrm_state_destroy); | |
453 | ||
53bc6b4d | 454 | int __xfrm_state_delete(struct xfrm_state *x) |
1da177e4 | 455 | { |
26b15dad JHS |
456 | int err = -ESRCH; |
457 | ||
1da177e4 LT |
458 | if (x->km.state != XFRM_STATE_DEAD) { |
459 | x->km.state = XFRM_STATE_DEAD; | |
460 | spin_lock(&xfrm_state_lock); | |
8f126e37 | 461 | hlist_del(&x->bydst); |
21380b81 | 462 | __xfrm_state_put(x); |
8f126e37 | 463 | hlist_del(&x->bysrc); |
6c44e6b7 | 464 | __xfrm_state_put(x); |
1da177e4 | 465 | if (x->id.spi) { |
8f126e37 | 466 | hlist_del(&x->byspi); |
21380b81 | 467 | __xfrm_state_put(x); |
1da177e4 | 468 | } |
f034b5d4 | 469 | xfrm_state_num--; |
1da177e4 LT |
470 | spin_unlock(&xfrm_state_lock); |
471 | if (del_timer(&x->timer)) | |
21380b81 | 472 | __xfrm_state_put(x); |
f8cd5488 JHS |
473 | if (del_timer(&x->rtimer)) |
474 | __xfrm_state_put(x); | |
1da177e4 LT |
475 | |
476 | /* The number two in this test is the reference | |
477 | * mentioned in the comment below plus the reference | |
478 | * our caller holds. A larger value means that | |
479 | * there are DSTs attached to this xfrm_state. | |
480 | */ | |
481 | if (atomic_read(&x->refcnt) > 2) { | |
482 | xfrm_state_gc_flush_bundles = 1; | |
483 | schedule_work(&xfrm_state_gc_work); | |
484 | } | |
485 | ||
486 | /* All xfrm_state objects are created by xfrm_state_alloc. | |
487 | * The xfrm_state_alloc call gives a reference, and that | |
488 | * is what we are dropping here. | |
489 | */ | |
21380b81 | 490 | __xfrm_state_put(x); |
26b15dad | 491 | err = 0; |
1da177e4 | 492 | } |
26b15dad JHS |
493 | |
494 | return err; | |
1da177e4 | 495 | } |
53bc6b4d | 496 | EXPORT_SYMBOL(__xfrm_state_delete); |
1da177e4 | 497 | |
26b15dad | 498 | int xfrm_state_delete(struct xfrm_state *x) |
1da177e4 | 499 | { |
26b15dad JHS |
500 | int err; |
501 | ||
1da177e4 | 502 | spin_lock_bh(&x->lock); |
26b15dad | 503 | err = __xfrm_state_delete(x); |
1da177e4 | 504 | spin_unlock_bh(&x->lock); |
26b15dad JHS |
505 | |
506 | return err; | |
1da177e4 LT |
507 | } |
508 | EXPORT_SYMBOL(xfrm_state_delete); | |
509 | ||
510 | void xfrm_state_flush(u8 proto) | |
511 | { | |
512 | int i; | |
1da177e4 LT |
513 | |
514 | spin_lock_bh(&xfrm_state_lock); | |
f034b5d4 | 515 | for (i = 0; i < xfrm_state_hmask; i++) { |
8f126e37 DM |
516 | struct hlist_node *entry; |
517 | struct xfrm_state *x; | |
1da177e4 | 518 | restart: |
8f126e37 | 519 | hlist_for_each_entry(x, entry, xfrm_state_bydst+i, bydst) { |
1da177e4 | 520 | if (!xfrm_state_kern(x) && |
5794708f | 521 | xfrm_id_proto_match(x->id.proto, proto)) { |
1da177e4 LT |
522 | xfrm_state_hold(x); |
523 | spin_unlock_bh(&xfrm_state_lock); | |
524 | ||
525 | xfrm_state_delete(x); | |
526 | xfrm_state_put(x); | |
527 | ||
528 | spin_lock_bh(&xfrm_state_lock); | |
529 | goto restart; | |
530 | } | |
531 | } | |
532 | } | |
533 | spin_unlock_bh(&xfrm_state_lock); | |
534 | wake_up(&km_waitq); | |
535 | } | |
536 | EXPORT_SYMBOL(xfrm_state_flush); | |
537 | ||
538 | static int | |
539 | xfrm_init_tempsel(struct xfrm_state *x, struct flowi *fl, | |
540 | struct xfrm_tmpl *tmpl, | |
541 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
542 | unsigned short family) | |
543 | { | |
544 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
545 | if (!afinfo) | |
546 | return -1; | |
547 | afinfo->init_tempsel(x, fl, tmpl, daddr, saddr); | |
548 | xfrm_state_put_afinfo(afinfo); | |
549 | return 0; | |
550 | } | |
551 | ||
edcd5821 DM |
552 | static struct xfrm_state *__xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family) |
553 | { | |
554 | unsigned int h = xfrm_spi_hash(daddr, spi, proto, family); | |
555 | struct xfrm_state *x; | |
8f126e37 | 556 | struct hlist_node *entry; |
edcd5821 | 557 | |
8f126e37 | 558 | hlist_for_each_entry(x, entry, xfrm_state_byspi+h, byspi) { |
edcd5821 DM |
559 | if (x->props.family != family || |
560 | x->id.spi != spi || | |
561 | x->id.proto != proto) | |
562 | continue; | |
563 | ||
564 | switch (family) { | |
565 | case AF_INET: | |
566 | if (x->id.daddr.a4 != daddr->a4) | |
567 | continue; | |
568 | break; | |
569 | case AF_INET6: | |
570 | if (!ipv6_addr_equal((struct in6_addr *)daddr, | |
571 | (struct in6_addr *) | |
572 | x->id.daddr.a6)) | |
573 | continue; | |
574 | break; | |
575 | }; | |
576 | ||
577 | xfrm_state_hold(x); | |
578 | return x; | |
579 | } | |
580 | ||
581 | return NULL; | |
582 | } | |
583 | ||
584 | static struct xfrm_state *__xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family) | |
585 | { | |
586 | unsigned int h = xfrm_src_hash(saddr, family); | |
587 | struct xfrm_state *x; | |
8f126e37 | 588 | struct hlist_node *entry; |
edcd5821 | 589 | |
8f126e37 | 590 | hlist_for_each_entry(x, entry, xfrm_state_bysrc+h, bysrc) { |
edcd5821 DM |
591 | if (x->props.family != family || |
592 | x->id.proto != proto) | |
593 | continue; | |
594 | ||
595 | switch (family) { | |
596 | case AF_INET: | |
597 | if (x->id.daddr.a4 != daddr->a4 || | |
598 | x->props.saddr.a4 != saddr->a4) | |
599 | continue; | |
600 | break; | |
601 | case AF_INET6: | |
602 | if (!ipv6_addr_equal((struct in6_addr *)daddr, | |
603 | (struct in6_addr *) | |
604 | x->id.daddr.a6) || | |
605 | !ipv6_addr_equal((struct in6_addr *)saddr, | |
606 | (struct in6_addr *) | |
607 | x->props.saddr.a6)) | |
608 | continue; | |
609 | break; | |
610 | }; | |
611 | ||
612 | xfrm_state_hold(x); | |
613 | return x; | |
614 | } | |
615 | ||
616 | return NULL; | |
617 | } | |
618 | ||
619 | static inline struct xfrm_state * | |
620 | __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family) | |
621 | { | |
622 | if (use_spi) | |
623 | return __xfrm_state_lookup(&x->id.daddr, x->id.spi, | |
624 | x->id.proto, family); | |
625 | else | |
626 | return __xfrm_state_lookup_byaddr(&x->id.daddr, | |
627 | &x->props.saddr, | |
628 | x->id.proto, family); | |
629 | } | |
630 | ||
1da177e4 LT |
631 | struct xfrm_state * |
632 | xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, | |
633 | struct flowi *fl, struct xfrm_tmpl *tmpl, | |
634 | struct xfrm_policy *pol, int *err, | |
635 | unsigned short family) | |
636 | { | |
8f126e37 DM |
637 | unsigned int h = xfrm_dst_hash(daddr, family); |
638 | struct hlist_node *entry; | |
1da177e4 LT |
639 | struct xfrm_state *x, *x0; |
640 | int acquire_in_progress = 0; | |
641 | int error = 0; | |
642 | struct xfrm_state *best = NULL; | |
1da177e4 | 643 | |
1da177e4 | 644 | spin_lock_bh(&xfrm_state_lock); |
8f126e37 | 645 | hlist_for_each_entry(x, entry, xfrm_state_bydst+h, bydst) { |
1da177e4 LT |
646 | if (x->props.family == family && |
647 | x->props.reqid == tmpl->reqid && | |
fbd9a5b4 | 648 | !(x->props.flags & XFRM_STATE_WILDRECV) && |
1da177e4 LT |
649 | xfrm_state_addr_check(x, daddr, saddr, family) && |
650 | tmpl->mode == x->props.mode && | |
651 | tmpl->id.proto == x->id.proto && | |
652 | (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) { | |
653 | /* Resolution logic: | |
654 | 1. There is a valid state with matching selector. | |
655 | Done. | |
656 | 2. Valid state with inappropriate selector. Skip. | |
657 | ||
658 | Entering area of "sysdeps". | |
659 | ||
660 | 3. If state is not valid, selector is temporary, | |
661 | it selects only session which triggered | |
662 | previous resolution. Key manager will do | |
663 | something to install a state with proper | |
664 | selector. | |
665 | */ | |
666 | if (x->km.state == XFRM_STATE_VALID) { | |
df71837d | 667 | if (!xfrm_selector_match(&x->sel, fl, family) || |
e0d1caa7 | 668 | !security_xfrm_state_pol_flow_match(x, pol, fl)) |
1da177e4 LT |
669 | continue; |
670 | if (!best || | |
671 | best->km.dying > x->km.dying || | |
672 | (best->km.dying == x->km.dying && | |
673 | best->curlft.add_time < x->curlft.add_time)) | |
674 | best = x; | |
675 | } else if (x->km.state == XFRM_STATE_ACQ) { | |
676 | acquire_in_progress = 1; | |
677 | } else if (x->km.state == XFRM_STATE_ERROR || | |
678 | x->km.state == XFRM_STATE_EXPIRED) { | |
df71837d | 679 | if (xfrm_selector_match(&x->sel, fl, family) && |
e0d1caa7 | 680 | security_xfrm_state_pol_flow_match(x, pol, fl)) |
1da177e4 LT |
681 | error = -ESRCH; |
682 | } | |
683 | } | |
684 | } | |
685 | ||
686 | x = best; | |
687 | if (!x && !error && !acquire_in_progress) { | |
5c5d281a | 688 | if (tmpl->id.spi && |
edcd5821 DM |
689 | (x0 = __xfrm_state_lookup(daddr, tmpl->id.spi, |
690 | tmpl->id.proto, family)) != NULL) { | |
1da177e4 LT |
691 | xfrm_state_put(x0); |
692 | error = -EEXIST; | |
693 | goto out; | |
694 | } | |
695 | x = xfrm_state_alloc(); | |
696 | if (x == NULL) { | |
697 | error = -ENOMEM; | |
698 | goto out; | |
699 | } | |
700 | /* Initialize temporary selector matching only | |
701 | * to current session. */ | |
702 | xfrm_init_tempsel(x, fl, tmpl, daddr, saddr, family); | |
703 | ||
e0d1caa7 VY |
704 | error = security_xfrm_state_alloc_acquire(x, pol->security, fl->secid); |
705 | if (error) { | |
706 | x->km.state = XFRM_STATE_DEAD; | |
707 | xfrm_state_put(x); | |
708 | x = NULL; | |
709 | goto out; | |
710 | } | |
711 | ||
1da177e4 LT |
712 | if (km_query(x, tmpl, pol) == 0) { |
713 | x->km.state = XFRM_STATE_ACQ; | |
8f126e37 | 714 | hlist_add_head(&x->bydst, xfrm_state_bydst+h); |
1da177e4 | 715 | xfrm_state_hold(x); |
8f126e37 DM |
716 | h = xfrm_src_hash(saddr, family); |
717 | hlist_add_head(&x->bysrc, xfrm_state_bysrc+h); | |
6c44e6b7 | 718 | xfrm_state_hold(x); |
1da177e4 LT |
719 | if (x->id.spi) { |
720 | h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, family); | |
8f126e37 | 721 | hlist_add_head(&x->byspi, xfrm_state_byspi+h); |
1da177e4 LT |
722 | xfrm_state_hold(x); |
723 | } | |
724 | x->lft.hard_add_expires_seconds = XFRM_ACQ_EXPIRES; | |
725 | xfrm_state_hold(x); | |
726 | x->timer.expires = jiffies + XFRM_ACQ_EXPIRES*HZ; | |
727 | add_timer(&x->timer); | |
728 | } else { | |
729 | x->km.state = XFRM_STATE_DEAD; | |
730 | xfrm_state_put(x); | |
731 | x = NULL; | |
732 | error = -ESRCH; | |
733 | } | |
734 | } | |
735 | out: | |
736 | if (x) | |
737 | xfrm_state_hold(x); | |
738 | else | |
739 | *err = acquire_in_progress ? -EAGAIN : error; | |
740 | spin_unlock_bh(&xfrm_state_lock); | |
1da177e4 LT |
741 | return x; |
742 | } | |
743 | ||
744 | static void __xfrm_state_insert(struct xfrm_state *x) | |
745 | { | |
f034b5d4 | 746 | unsigned int h = xfrm_dst_hash(&x->id.daddr, x->props.family); |
1da177e4 | 747 | |
8f126e37 | 748 | hlist_add_head(&x->bydst, xfrm_state_bydst+h); |
1da177e4 LT |
749 | xfrm_state_hold(x); |
750 | ||
6c44e6b7 | 751 | h = xfrm_src_hash(&x->props.saddr, x->props.family); |
1da177e4 | 752 | |
8f126e37 | 753 | hlist_add_head(&x->bysrc, xfrm_state_bysrc+h); |
1da177e4 LT |
754 | xfrm_state_hold(x); |
755 | ||
6c44e6b7 MN |
756 | if (xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY)) { |
757 | h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, | |
758 | x->props.family); | |
759 | ||
8f126e37 | 760 | hlist_add_head(&x->byspi, xfrm_state_byspi+h); |
6c44e6b7 MN |
761 | xfrm_state_hold(x); |
762 | } | |
763 | ||
1da177e4 LT |
764 | if (!mod_timer(&x->timer, jiffies + HZ)) |
765 | xfrm_state_hold(x); | |
766 | ||
f8cd5488 JHS |
767 | if (x->replay_maxage && |
768 | !mod_timer(&x->rtimer, jiffies + x->replay_maxage)) | |
769 | xfrm_state_hold(x); | |
770 | ||
1da177e4 | 771 | wake_up(&km_waitq); |
f034b5d4 DM |
772 | |
773 | xfrm_state_num++; | |
774 | ||
775 | if (x->bydst.next != NULL && | |
776 | (xfrm_state_hmask + 1) < xfrm_state_hashmax && | |
777 | xfrm_state_num > xfrm_state_hmask) | |
778 | schedule_work(&xfrm_hash_work); | |
1da177e4 LT |
779 | } |
780 | ||
781 | void xfrm_state_insert(struct xfrm_state *x) | |
782 | { | |
783 | spin_lock_bh(&xfrm_state_lock); | |
784 | __xfrm_state_insert(x); | |
785 | spin_unlock_bh(&xfrm_state_lock); | |
399c180a DM |
786 | |
787 | xfrm_flush_all_bundles(); | |
1da177e4 LT |
788 | } |
789 | EXPORT_SYMBOL(xfrm_state_insert); | |
790 | ||
2770834c DM |
791 | /* xfrm_state_lock is held */ |
792 | 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) | |
793 | { | |
794 | unsigned int h = xfrm_dst_hash(daddr, family); | |
8f126e37 | 795 | struct hlist_node *entry; |
2770834c DM |
796 | struct xfrm_state *x; |
797 | ||
8f126e37 | 798 | hlist_for_each_entry(x, entry, xfrm_state_bydst+h, bydst) { |
2770834c DM |
799 | if (x->props.reqid != reqid || |
800 | x->props.mode != mode || | |
801 | x->props.family != family || | |
802 | x->km.state != XFRM_STATE_ACQ || | |
803 | x->id.spi != 0) | |
804 | continue; | |
805 | ||
806 | switch (family) { | |
807 | case AF_INET: | |
808 | if (x->id.daddr.a4 != daddr->a4 || | |
809 | x->props.saddr.a4 != saddr->a4) | |
810 | continue; | |
811 | break; | |
812 | case AF_INET6: | |
813 | if (!ipv6_addr_equal((struct in6_addr *)x->id.daddr.a6, | |
814 | (struct in6_addr *)daddr) || | |
815 | !ipv6_addr_equal((struct in6_addr *) | |
816 | x->props.saddr.a6, | |
817 | (struct in6_addr *)saddr)) | |
818 | continue; | |
819 | break; | |
820 | }; | |
821 | ||
822 | xfrm_state_hold(x); | |
823 | return x; | |
824 | } | |
825 | ||
826 | if (!create) | |
827 | return NULL; | |
828 | ||
829 | x = xfrm_state_alloc(); | |
830 | if (likely(x)) { | |
831 | switch (family) { | |
832 | case AF_INET: | |
833 | x->sel.daddr.a4 = daddr->a4; | |
834 | x->sel.saddr.a4 = saddr->a4; | |
835 | x->sel.prefixlen_d = 32; | |
836 | x->sel.prefixlen_s = 32; | |
837 | x->props.saddr.a4 = saddr->a4; | |
838 | x->id.daddr.a4 = daddr->a4; | |
839 | break; | |
840 | ||
841 | case AF_INET6: | |
842 | ipv6_addr_copy((struct in6_addr *)x->sel.daddr.a6, | |
843 | (struct in6_addr *)daddr); | |
844 | ipv6_addr_copy((struct in6_addr *)x->sel.saddr.a6, | |
845 | (struct in6_addr *)saddr); | |
846 | x->sel.prefixlen_d = 128; | |
847 | x->sel.prefixlen_s = 128; | |
848 | ipv6_addr_copy((struct in6_addr *)x->props.saddr.a6, | |
849 | (struct in6_addr *)saddr); | |
850 | ipv6_addr_copy((struct in6_addr *)x->id.daddr.a6, | |
851 | (struct in6_addr *)daddr); | |
852 | break; | |
853 | }; | |
854 | ||
855 | x->km.state = XFRM_STATE_ACQ; | |
856 | x->id.proto = proto; | |
857 | x->props.family = family; | |
858 | x->props.mode = mode; | |
859 | x->props.reqid = reqid; | |
860 | x->lft.hard_add_expires_seconds = XFRM_ACQ_EXPIRES; | |
861 | xfrm_state_hold(x); | |
862 | x->timer.expires = jiffies + XFRM_ACQ_EXPIRES*HZ; | |
863 | add_timer(&x->timer); | |
864 | xfrm_state_hold(x); | |
8f126e37 | 865 | hlist_add_head(&x->bydst, xfrm_state_bydst+h); |
2770834c DM |
866 | h = xfrm_src_hash(saddr, family); |
867 | xfrm_state_hold(x); | |
8f126e37 | 868 | hlist_add_head(&x->bysrc, xfrm_state_bysrc+h); |
2770834c DM |
869 | wake_up(&km_waitq); |
870 | } | |
871 | ||
872 | return x; | |
873 | } | |
874 | ||
1da177e4 LT |
875 | static struct xfrm_state *__xfrm_find_acq_byseq(u32 seq); |
876 | ||
877 | int xfrm_state_add(struct xfrm_state *x) | |
878 | { | |
1da177e4 LT |
879 | struct xfrm_state *x1; |
880 | int family; | |
881 | int err; | |
eb2971b6 | 882 | int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); |
1da177e4 LT |
883 | |
884 | family = x->props.family; | |
1da177e4 LT |
885 | |
886 | spin_lock_bh(&xfrm_state_lock); | |
887 | ||
edcd5821 | 888 | x1 = __xfrm_state_locate(x, use_spi, family); |
1da177e4 LT |
889 | if (x1) { |
890 | xfrm_state_put(x1); | |
891 | x1 = NULL; | |
892 | err = -EEXIST; | |
893 | goto out; | |
894 | } | |
895 | ||
eb2971b6 | 896 | if (use_spi && x->km.seq) { |
1da177e4 LT |
897 | x1 = __xfrm_find_acq_byseq(x->km.seq); |
898 | if (x1 && xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family)) { | |
899 | xfrm_state_put(x1); | |
900 | x1 = NULL; | |
901 | } | |
902 | } | |
903 | ||
eb2971b6 | 904 | if (use_spi && !x1) |
2770834c DM |
905 | x1 = __find_acq_core(family, x->props.mode, x->props.reqid, |
906 | x->id.proto, | |
907 | &x->id.daddr, &x->props.saddr, 0); | |
1da177e4 LT |
908 | |
909 | __xfrm_state_insert(x); | |
910 | err = 0; | |
911 | ||
912 | out: | |
913 | spin_unlock_bh(&xfrm_state_lock); | |
1da177e4 | 914 | |
399c180a DM |
915 | if (!err) |
916 | xfrm_flush_all_bundles(); | |
917 | ||
1da177e4 LT |
918 | if (x1) { |
919 | xfrm_state_delete(x1); | |
920 | xfrm_state_put(x1); | |
921 | } | |
922 | ||
923 | return err; | |
924 | } | |
925 | EXPORT_SYMBOL(xfrm_state_add); | |
926 | ||
927 | int xfrm_state_update(struct xfrm_state *x) | |
928 | { | |
1da177e4 LT |
929 | struct xfrm_state *x1; |
930 | int err; | |
eb2971b6 | 931 | int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); |
1da177e4 | 932 | |
1da177e4 | 933 | spin_lock_bh(&xfrm_state_lock); |
edcd5821 | 934 | x1 = __xfrm_state_locate(x, use_spi, x->props.family); |
1da177e4 LT |
935 | |
936 | err = -ESRCH; | |
937 | if (!x1) | |
938 | goto out; | |
939 | ||
940 | if (xfrm_state_kern(x1)) { | |
941 | xfrm_state_put(x1); | |
942 | err = -EEXIST; | |
943 | goto out; | |
944 | } | |
945 | ||
946 | if (x1->km.state == XFRM_STATE_ACQ) { | |
947 | __xfrm_state_insert(x); | |
948 | x = NULL; | |
949 | } | |
950 | err = 0; | |
951 | ||
952 | out: | |
953 | spin_unlock_bh(&xfrm_state_lock); | |
1da177e4 LT |
954 | |
955 | if (err) | |
956 | return err; | |
957 | ||
958 | if (!x) { | |
959 | xfrm_state_delete(x1); | |
960 | xfrm_state_put(x1); | |
961 | return 0; | |
962 | } | |
963 | ||
964 | err = -EINVAL; | |
965 | spin_lock_bh(&x1->lock); | |
966 | if (likely(x1->km.state == XFRM_STATE_VALID)) { | |
967 | if (x->encap && x1->encap) | |
968 | memcpy(x1->encap, x->encap, sizeof(*x1->encap)); | |
060f02a3 NT |
969 | if (x->coaddr && x1->coaddr) { |
970 | memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr)); | |
971 | } | |
972 | if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel))) | |
973 | memcpy(&x1->sel, &x->sel, sizeof(x1->sel)); | |
1da177e4 LT |
974 | memcpy(&x1->lft, &x->lft, sizeof(x1->lft)); |
975 | x1->km.dying = 0; | |
976 | ||
977 | if (!mod_timer(&x1->timer, jiffies + HZ)) | |
978 | xfrm_state_hold(x1); | |
979 | if (x1->curlft.use_time) | |
980 | xfrm_state_check_expire(x1); | |
981 | ||
982 | err = 0; | |
983 | } | |
984 | spin_unlock_bh(&x1->lock); | |
985 | ||
986 | xfrm_state_put(x1); | |
987 | ||
988 | return err; | |
989 | } | |
990 | EXPORT_SYMBOL(xfrm_state_update); | |
991 | ||
992 | int xfrm_state_check_expire(struct xfrm_state *x) | |
993 | { | |
994 | if (!x->curlft.use_time) | |
995 | x->curlft.use_time = (unsigned long)xtime.tv_sec; | |
996 | ||
997 | if (x->km.state != XFRM_STATE_VALID) | |
998 | return -EINVAL; | |
999 | ||
1000 | if (x->curlft.bytes >= x->lft.hard_byte_limit || | |
1001 | x->curlft.packets >= x->lft.hard_packet_limit) { | |
4666faab HX |
1002 | x->km.state = XFRM_STATE_EXPIRED; |
1003 | if (!mod_timer(&x->timer, jiffies)) | |
1da177e4 LT |
1004 | xfrm_state_hold(x); |
1005 | return -EINVAL; | |
1006 | } | |
1007 | ||
1008 | if (!x->km.dying && | |
1009 | (x->curlft.bytes >= x->lft.soft_byte_limit || | |
4666faab HX |
1010 | x->curlft.packets >= x->lft.soft_packet_limit)) { |
1011 | x->km.dying = 1; | |
53bc6b4d | 1012 | km_state_expired(x, 0, 0); |
4666faab | 1013 | } |
1da177e4 LT |
1014 | return 0; |
1015 | } | |
1016 | EXPORT_SYMBOL(xfrm_state_check_expire); | |
1017 | ||
1018 | static int xfrm_state_check_space(struct xfrm_state *x, struct sk_buff *skb) | |
1019 | { | |
1020 | int nhead = x->props.header_len + LL_RESERVED_SPACE(skb->dst->dev) | |
1021 | - skb_headroom(skb); | |
1022 | ||
1023 | if (nhead > 0) | |
1024 | return pskb_expand_head(skb, nhead, 0, GFP_ATOMIC); | |
1025 | ||
1026 | /* Check tail too... */ | |
1027 | return 0; | |
1028 | } | |
1029 | ||
1030 | int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb) | |
1031 | { | |
1032 | int err = xfrm_state_check_expire(x); | |
1033 | if (err < 0) | |
1034 | goto err; | |
1035 | err = xfrm_state_check_space(x, skb); | |
1036 | err: | |
1037 | return err; | |
1038 | } | |
1039 | EXPORT_SYMBOL(xfrm_state_check); | |
1040 | ||
1041 | struct xfrm_state * | |
1042 | xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, | |
1043 | unsigned short family) | |
1044 | { | |
1045 | struct xfrm_state *x; | |
1da177e4 LT |
1046 | |
1047 | spin_lock_bh(&xfrm_state_lock); | |
edcd5821 | 1048 | x = __xfrm_state_lookup(daddr, spi, proto, family); |
1da177e4 | 1049 | spin_unlock_bh(&xfrm_state_lock); |
1da177e4 LT |
1050 | return x; |
1051 | } | |
1052 | EXPORT_SYMBOL(xfrm_state_lookup); | |
1053 | ||
1054 | struct xfrm_state * | |
eb2971b6 MN |
1055 | xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, |
1056 | u8 proto, unsigned short family) | |
1057 | { | |
1058 | struct xfrm_state *x; | |
eb2971b6 MN |
1059 | |
1060 | spin_lock_bh(&xfrm_state_lock); | |
edcd5821 | 1061 | x = __xfrm_state_lookup_byaddr(daddr, saddr, proto, family); |
eb2971b6 | 1062 | spin_unlock_bh(&xfrm_state_lock); |
eb2971b6 MN |
1063 | return x; |
1064 | } | |
1065 | EXPORT_SYMBOL(xfrm_state_lookup_byaddr); | |
1066 | ||
1067 | struct xfrm_state * | |
1da177e4 LT |
1068 | xfrm_find_acq(u8 mode, u32 reqid, u8 proto, |
1069 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
1070 | int create, unsigned short family) | |
1071 | { | |
1072 | struct xfrm_state *x; | |
1da177e4 LT |
1073 | |
1074 | spin_lock_bh(&xfrm_state_lock); | |
2770834c | 1075 | x = __find_acq_core(family, mode, reqid, proto, daddr, saddr, create); |
1da177e4 | 1076 | spin_unlock_bh(&xfrm_state_lock); |
2770834c | 1077 | |
1da177e4 LT |
1078 | return x; |
1079 | } | |
1080 | EXPORT_SYMBOL(xfrm_find_acq); | |
1081 | ||
41a49cc3 MN |
1082 | #ifdef CONFIG_XFRM_SUB_POLICY |
1083 | int | |
1084 | xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, | |
1085 | unsigned short family) | |
1086 | { | |
1087 | int err = 0; | |
1088 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
1089 | if (!afinfo) | |
1090 | return -EAFNOSUPPORT; | |
1091 | ||
1092 | spin_lock_bh(&xfrm_state_lock); | |
1093 | if (afinfo->tmpl_sort) | |
1094 | err = afinfo->tmpl_sort(dst, src, n); | |
1095 | spin_unlock_bh(&xfrm_state_lock); | |
1096 | xfrm_state_put_afinfo(afinfo); | |
1097 | return err; | |
1098 | } | |
1099 | EXPORT_SYMBOL(xfrm_tmpl_sort); | |
1100 | ||
1101 | int | |
1102 | xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, | |
1103 | unsigned short family) | |
1104 | { | |
1105 | int err = 0; | |
1106 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
1107 | if (!afinfo) | |
1108 | return -EAFNOSUPPORT; | |
1109 | ||
1110 | spin_lock_bh(&xfrm_state_lock); | |
1111 | if (afinfo->state_sort) | |
1112 | err = afinfo->state_sort(dst, src, n); | |
1113 | spin_unlock_bh(&xfrm_state_lock); | |
1114 | xfrm_state_put_afinfo(afinfo); | |
1115 | return err; | |
1116 | } | |
1117 | EXPORT_SYMBOL(xfrm_state_sort); | |
1118 | #endif | |
1119 | ||
1da177e4 LT |
1120 | /* Silly enough, but I'm lazy to build resolution list */ |
1121 | ||
1122 | static struct xfrm_state *__xfrm_find_acq_byseq(u32 seq) | |
1123 | { | |
1124 | int i; | |
1da177e4 | 1125 | |
f034b5d4 | 1126 | for (i = 0; i <= xfrm_state_hmask; i++) { |
8f126e37 DM |
1127 | struct hlist_node *entry; |
1128 | struct xfrm_state *x; | |
1129 | ||
1130 | hlist_for_each_entry(x, entry, xfrm_state_bydst+i, bydst) { | |
1131 | if (x->km.seq == seq && | |
1132 | x->km.state == XFRM_STATE_ACQ) { | |
1da177e4 LT |
1133 | xfrm_state_hold(x); |
1134 | return x; | |
1135 | } | |
1136 | } | |
1137 | } | |
1138 | return NULL; | |
1139 | } | |
1140 | ||
1141 | struct xfrm_state *xfrm_find_acq_byseq(u32 seq) | |
1142 | { | |
1143 | struct xfrm_state *x; | |
1144 | ||
1145 | spin_lock_bh(&xfrm_state_lock); | |
1146 | x = __xfrm_find_acq_byseq(seq); | |
1147 | spin_unlock_bh(&xfrm_state_lock); | |
1148 | return x; | |
1149 | } | |
1150 | EXPORT_SYMBOL(xfrm_find_acq_byseq); | |
1151 | ||
1152 | u32 xfrm_get_acqseq(void) | |
1153 | { | |
1154 | u32 res; | |
1155 | static u32 acqseq; | |
1156 | static DEFINE_SPINLOCK(acqseq_lock); | |
1157 | ||
1158 | spin_lock_bh(&acqseq_lock); | |
1159 | res = (++acqseq ? : ++acqseq); | |
1160 | spin_unlock_bh(&acqseq_lock); | |
1161 | return res; | |
1162 | } | |
1163 | EXPORT_SYMBOL(xfrm_get_acqseq); | |
1164 | ||
1165 | void | |
1166 | xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi) | |
1167 | { | |
f034b5d4 | 1168 | unsigned int h; |
1da177e4 LT |
1169 | struct xfrm_state *x0; |
1170 | ||
1171 | if (x->id.spi) | |
1172 | return; | |
1173 | ||
1174 | if (minspi == maxspi) { | |
1175 | x0 = xfrm_state_lookup(&x->id.daddr, minspi, x->id.proto, x->props.family); | |
1176 | if (x0) { | |
1177 | xfrm_state_put(x0); | |
1178 | return; | |
1179 | } | |
1180 | x->id.spi = minspi; | |
1181 | } else { | |
1182 | u32 spi = 0; | |
1183 | minspi = ntohl(minspi); | |
1184 | maxspi = ntohl(maxspi); | |
1185 | for (h=0; h<maxspi-minspi+1; h++) { | |
1186 | spi = minspi + net_random()%(maxspi-minspi+1); | |
1187 | x0 = xfrm_state_lookup(&x->id.daddr, htonl(spi), x->id.proto, x->props.family); | |
1188 | if (x0 == NULL) { | |
1189 | x->id.spi = htonl(spi); | |
1190 | break; | |
1191 | } | |
1192 | xfrm_state_put(x0); | |
1193 | } | |
1194 | } | |
1195 | if (x->id.spi) { | |
1196 | spin_lock_bh(&xfrm_state_lock); | |
1197 | h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, x->props.family); | |
8f126e37 | 1198 | hlist_add_head(&x->byspi, xfrm_state_byspi+h); |
1da177e4 LT |
1199 | xfrm_state_hold(x); |
1200 | spin_unlock_bh(&xfrm_state_lock); | |
1201 | wake_up(&km_waitq); | |
1202 | } | |
1203 | } | |
1204 | EXPORT_SYMBOL(xfrm_alloc_spi); | |
1205 | ||
1206 | int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), | |
1207 | void *data) | |
1208 | { | |
1209 | int i; | |
1210 | struct xfrm_state *x; | |
8f126e37 | 1211 | struct hlist_node *entry; |
1da177e4 LT |
1212 | int count = 0; |
1213 | int err = 0; | |
1214 | ||
1215 | spin_lock_bh(&xfrm_state_lock); | |
f034b5d4 | 1216 | for (i = 0; i <= xfrm_state_hmask; i++) { |
8f126e37 | 1217 | hlist_for_each_entry(x, entry, xfrm_state_bydst+i, bydst) { |
5794708f | 1218 | if (xfrm_id_proto_match(x->id.proto, proto)) |
1da177e4 LT |
1219 | count++; |
1220 | } | |
1221 | } | |
1222 | if (count == 0) { | |
1223 | err = -ENOENT; | |
1224 | goto out; | |
1225 | } | |
1226 | ||
f034b5d4 | 1227 | for (i = 0; i <= xfrm_state_hmask; i++) { |
8f126e37 | 1228 | hlist_for_each_entry(x, entry, xfrm_state_bydst+i, bydst) { |
5794708f | 1229 | if (!xfrm_id_proto_match(x->id.proto, proto)) |
1da177e4 LT |
1230 | continue; |
1231 | err = func(x, --count, data); | |
1232 | if (err) | |
1233 | goto out; | |
1234 | } | |
1235 | } | |
1236 | out: | |
1237 | spin_unlock_bh(&xfrm_state_lock); | |
1238 | return err; | |
1239 | } | |
1240 | EXPORT_SYMBOL(xfrm_state_walk); | |
1241 | ||
f8cd5488 JHS |
1242 | |
1243 | void xfrm_replay_notify(struct xfrm_state *x, int event) | |
1244 | { | |
1245 | struct km_event c; | |
1246 | /* we send notify messages in case | |
1247 | * 1. we updated on of the sequence numbers, and the seqno difference | |
1248 | * is at least x->replay_maxdiff, in this case we also update the | |
1249 | * timeout of our timer function | |
1250 | * 2. if x->replay_maxage has elapsed since last update, | |
1251 | * and there were changes | |
1252 | * | |
1253 | * The state structure must be locked! | |
1254 | */ | |
1255 | ||
1256 | switch (event) { | |
1257 | case XFRM_REPLAY_UPDATE: | |
1258 | if (x->replay_maxdiff && | |
1259 | (x->replay.seq - x->preplay.seq < x->replay_maxdiff) && | |
2717096a JHS |
1260 | (x->replay.oseq - x->preplay.oseq < x->replay_maxdiff)) { |
1261 | if (x->xflags & XFRM_TIME_DEFER) | |
1262 | event = XFRM_REPLAY_TIMEOUT; | |
1263 | else | |
1264 | return; | |
1265 | } | |
f8cd5488 JHS |
1266 | |
1267 | break; | |
1268 | ||
1269 | case XFRM_REPLAY_TIMEOUT: | |
1270 | if ((x->replay.seq == x->preplay.seq) && | |
1271 | (x->replay.bitmap == x->preplay.bitmap) && | |
2717096a JHS |
1272 | (x->replay.oseq == x->preplay.oseq)) { |
1273 | x->xflags |= XFRM_TIME_DEFER; | |
f8cd5488 | 1274 | return; |
2717096a | 1275 | } |
f8cd5488 JHS |
1276 | |
1277 | break; | |
1278 | } | |
1279 | ||
1280 | memcpy(&x->preplay, &x->replay, sizeof(struct xfrm_replay_state)); | |
1281 | c.event = XFRM_MSG_NEWAE; | |
1282 | c.data.aevent = event; | |
1283 | km_state_notify(x, &c); | |
1284 | ||
f8cd5488 | 1285 | if (x->replay_maxage && |
2717096a | 1286 | !mod_timer(&x->rtimer, jiffies + x->replay_maxage)) { |
f8cd5488 | 1287 | xfrm_state_hold(x); |
2717096a JHS |
1288 | x->xflags &= ~XFRM_TIME_DEFER; |
1289 | } | |
f8cd5488 | 1290 | } |
a70fcb0b | 1291 | EXPORT_SYMBOL(xfrm_replay_notify); |
f8cd5488 JHS |
1292 | |
1293 | static void xfrm_replay_timer_handler(unsigned long data) | |
1294 | { | |
1295 | struct xfrm_state *x = (struct xfrm_state*)data; | |
1296 | ||
1297 | spin_lock(&x->lock); | |
1298 | ||
2717096a JHS |
1299 | if (x->km.state == XFRM_STATE_VALID) { |
1300 | if (xfrm_aevent_is_on()) | |
1301 | xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT); | |
1302 | else | |
1303 | x->xflags |= XFRM_TIME_DEFER; | |
1304 | } | |
f8cd5488 JHS |
1305 | |
1306 | spin_unlock(&x->lock); | |
2717096a | 1307 | xfrm_state_put(x); |
f8cd5488 JHS |
1308 | } |
1309 | ||
1da177e4 LT |
1310 | int xfrm_replay_check(struct xfrm_state *x, u32 seq) |
1311 | { | |
1312 | u32 diff; | |
1313 | ||
1314 | seq = ntohl(seq); | |
1315 | ||
1316 | if (unlikely(seq == 0)) | |
1317 | return -EINVAL; | |
1318 | ||
1319 | if (likely(seq > x->replay.seq)) | |
1320 | return 0; | |
1321 | ||
1322 | diff = x->replay.seq - seq; | |
1323 | if (diff >= x->props.replay_window) { | |
1324 | x->stats.replay_window++; | |
1325 | return -EINVAL; | |
1326 | } | |
1327 | ||
1328 | if (x->replay.bitmap & (1U << diff)) { | |
1329 | x->stats.replay++; | |
1330 | return -EINVAL; | |
1331 | } | |
1332 | return 0; | |
1333 | } | |
1334 | EXPORT_SYMBOL(xfrm_replay_check); | |
1335 | ||
1336 | void xfrm_replay_advance(struct xfrm_state *x, u32 seq) | |
1337 | { | |
1338 | u32 diff; | |
1339 | ||
1340 | seq = ntohl(seq); | |
1341 | ||
1342 | if (seq > x->replay.seq) { | |
1343 | diff = seq - x->replay.seq; | |
1344 | if (diff < x->props.replay_window) | |
1345 | x->replay.bitmap = ((x->replay.bitmap) << diff) | 1; | |
1346 | else | |
1347 | x->replay.bitmap = 1; | |
1348 | x->replay.seq = seq; | |
1349 | } else { | |
1350 | diff = x->replay.seq - seq; | |
1351 | x->replay.bitmap |= (1U << diff); | |
1352 | } | |
f8cd5488 JHS |
1353 | |
1354 | if (xfrm_aevent_is_on()) | |
1355 | xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); | |
1da177e4 LT |
1356 | } |
1357 | EXPORT_SYMBOL(xfrm_replay_advance); | |
1358 | ||
1359 | static struct list_head xfrm_km_list = LIST_HEAD_INIT(xfrm_km_list); | |
1360 | static DEFINE_RWLOCK(xfrm_km_lock); | |
1361 | ||
26b15dad | 1362 | void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) |
1da177e4 LT |
1363 | { |
1364 | struct xfrm_mgr *km; | |
1365 | ||
26b15dad JHS |
1366 | read_lock(&xfrm_km_lock); |
1367 | list_for_each_entry(km, &xfrm_km_list, list) | |
1368 | if (km->notify_policy) | |
1369 | km->notify_policy(xp, dir, c); | |
1370 | read_unlock(&xfrm_km_lock); | |
1371 | } | |
1da177e4 | 1372 | |
26b15dad JHS |
1373 | void km_state_notify(struct xfrm_state *x, struct km_event *c) |
1374 | { | |
1375 | struct xfrm_mgr *km; | |
1da177e4 LT |
1376 | read_lock(&xfrm_km_lock); |
1377 | list_for_each_entry(km, &xfrm_km_list, list) | |
26b15dad JHS |
1378 | if (km->notify) |
1379 | km->notify(x, c); | |
1da177e4 | 1380 | read_unlock(&xfrm_km_lock); |
26b15dad JHS |
1381 | } |
1382 | ||
1383 | EXPORT_SYMBOL(km_policy_notify); | |
1384 | EXPORT_SYMBOL(km_state_notify); | |
1385 | ||
53bc6b4d | 1386 | void km_state_expired(struct xfrm_state *x, int hard, u32 pid) |
26b15dad JHS |
1387 | { |
1388 | struct km_event c; | |
1389 | ||
bf08867f | 1390 | c.data.hard = hard; |
53bc6b4d | 1391 | c.pid = pid; |
f60f6b8f | 1392 | c.event = XFRM_MSG_EXPIRE; |
26b15dad | 1393 | km_state_notify(x, &c); |
1da177e4 LT |
1394 | |
1395 | if (hard) | |
1396 | wake_up(&km_waitq); | |
1397 | } | |
1398 | ||
53bc6b4d | 1399 | EXPORT_SYMBOL(km_state_expired); |
26b15dad JHS |
1400 | /* |
1401 | * We send to all registered managers regardless of failure | |
1402 | * We are happy with one success | |
1403 | */ | |
980ebd25 | 1404 | int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol) |
1da177e4 | 1405 | { |
26b15dad | 1406 | int err = -EINVAL, acqret; |
1da177e4 LT |
1407 | struct xfrm_mgr *km; |
1408 | ||
1409 | read_lock(&xfrm_km_lock); | |
1410 | list_for_each_entry(km, &xfrm_km_list, list) { | |
26b15dad JHS |
1411 | acqret = km->acquire(x, t, pol, XFRM_POLICY_OUT); |
1412 | if (!acqret) | |
1413 | err = acqret; | |
1da177e4 LT |
1414 | } |
1415 | read_unlock(&xfrm_km_lock); | |
1416 | return err; | |
1417 | } | |
980ebd25 | 1418 | EXPORT_SYMBOL(km_query); |
1da177e4 LT |
1419 | |
1420 | int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport) | |
1421 | { | |
1422 | int err = -EINVAL; | |
1423 | struct xfrm_mgr *km; | |
1424 | ||
1425 | read_lock(&xfrm_km_lock); | |
1426 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1427 | if (km->new_mapping) | |
1428 | err = km->new_mapping(x, ipaddr, sport); | |
1429 | if (!err) | |
1430 | break; | |
1431 | } | |
1432 | read_unlock(&xfrm_km_lock); | |
1433 | return err; | |
1434 | } | |
1435 | EXPORT_SYMBOL(km_new_mapping); | |
1436 | ||
6c5c8ca7 | 1437 | void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid) |
1da177e4 | 1438 | { |
26b15dad | 1439 | struct km_event c; |
1da177e4 | 1440 | |
bf08867f | 1441 | c.data.hard = hard; |
6c5c8ca7 | 1442 | c.pid = pid; |
f60f6b8f | 1443 | c.event = XFRM_MSG_POLEXPIRE; |
26b15dad | 1444 | km_policy_notify(pol, dir, &c); |
1da177e4 LT |
1445 | |
1446 | if (hard) | |
1447 | wake_up(&km_waitq); | |
1448 | } | |
a70fcb0b | 1449 | EXPORT_SYMBOL(km_policy_expired); |
1da177e4 | 1450 | |
97a64b45 MN |
1451 | int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr) |
1452 | { | |
1453 | int err = -EINVAL; | |
1454 | int ret; | |
1455 | struct xfrm_mgr *km; | |
1456 | ||
1457 | read_lock(&xfrm_km_lock); | |
1458 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1459 | if (km->report) { | |
1460 | ret = km->report(proto, sel, addr); | |
1461 | if (!ret) | |
1462 | err = ret; | |
1463 | } | |
1464 | } | |
1465 | read_unlock(&xfrm_km_lock); | |
1466 | return err; | |
1467 | } | |
1468 | EXPORT_SYMBOL(km_report); | |
1469 | ||
1da177e4 LT |
1470 | int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) |
1471 | { | |
1472 | int err; | |
1473 | u8 *data; | |
1474 | struct xfrm_mgr *km; | |
1475 | struct xfrm_policy *pol = NULL; | |
1476 | ||
1477 | if (optlen <= 0 || optlen > PAGE_SIZE) | |
1478 | return -EMSGSIZE; | |
1479 | ||
1480 | data = kmalloc(optlen, GFP_KERNEL); | |
1481 | if (!data) | |
1482 | return -ENOMEM; | |
1483 | ||
1484 | err = -EFAULT; | |
1485 | if (copy_from_user(data, optval, optlen)) | |
1486 | goto out; | |
1487 | ||
1488 | err = -EINVAL; | |
1489 | read_lock(&xfrm_km_lock); | |
1490 | list_for_each_entry(km, &xfrm_km_list, list) { | |
cb969f07 | 1491 | pol = km->compile_policy(sk, optname, data, |
1da177e4 LT |
1492 | optlen, &err); |
1493 | if (err >= 0) | |
1494 | break; | |
1495 | } | |
1496 | read_unlock(&xfrm_km_lock); | |
1497 | ||
1498 | if (err >= 0) { | |
1499 | xfrm_sk_policy_insert(sk, err, pol); | |
1500 | xfrm_pol_put(pol); | |
1501 | err = 0; | |
1502 | } | |
1503 | ||
1504 | out: | |
1505 | kfree(data); | |
1506 | return err; | |
1507 | } | |
1508 | EXPORT_SYMBOL(xfrm_user_policy); | |
1509 | ||
1510 | int xfrm_register_km(struct xfrm_mgr *km) | |
1511 | { | |
1512 | write_lock_bh(&xfrm_km_lock); | |
1513 | list_add_tail(&km->list, &xfrm_km_list); | |
1514 | write_unlock_bh(&xfrm_km_lock); | |
1515 | return 0; | |
1516 | } | |
1517 | EXPORT_SYMBOL(xfrm_register_km); | |
1518 | ||
1519 | int xfrm_unregister_km(struct xfrm_mgr *km) | |
1520 | { | |
1521 | write_lock_bh(&xfrm_km_lock); | |
1522 | list_del(&km->list); | |
1523 | write_unlock_bh(&xfrm_km_lock); | |
1524 | return 0; | |
1525 | } | |
1526 | EXPORT_SYMBOL(xfrm_unregister_km); | |
1527 | ||
1528 | int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo) | |
1529 | { | |
1530 | int err = 0; | |
1531 | if (unlikely(afinfo == NULL)) | |
1532 | return -EINVAL; | |
1533 | if (unlikely(afinfo->family >= NPROTO)) | |
1534 | return -EAFNOSUPPORT; | |
f3111502 | 1535 | write_lock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1536 | if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL)) |
1537 | err = -ENOBUFS; | |
edcd5821 | 1538 | else |
1da177e4 | 1539 | xfrm_state_afinfo[afinfo->family] = afinfo; |
f3111502 | 1540 | write_unlock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1541 | return err; |
1542 | } | |
1543 | EXPORT_SYMBOL(xfrm_state_register_afinfo); | |
1544 | ||
1545 | int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo) | |
1546 | { | |
1547 | int err = 0; | |
1548 | if (unlikely(afinfo == NULL)) | |
1549 | return -EINVAL; | |
1550 | if (unlikely(afinfo->family >= NPROTO)) | |
1551 | return -EAFNOSUPPORT; | |
f3111502 | 1552 | write_lock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1553 | if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) { |
1554 | if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo)) | |
1555 | err = -EINVAL; | |
edcd5821 | 1556 | else |
1da177e4 | 1557 | xfrm_state_afinfo[afinfo->family] = NULL; |
1da177e4 | 1558 | } |
f3111502 | 1559 | write_unlock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1560 | return err; |
1561 | } | |
1562 | EXPORT_SYMBOL(xfrm_state_unregister_afinfo); | |
1563 | ||
1564 | static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family) | |
1565 | { | |
1566 | struct xfrm_state_afinfo *afinfo; | |
1567 | if (unlikely(family >= NPROTO)) | |
1568 | return NULL; | |
1569 | read_lock(&xfrm_state_afinfo_lock); | |
1570 | afinfo = xfrm_state_afinfo[family]; | |
546be240 HX |
1571 | if (unlikely(!afinfo)) |
1572 | read_unlock(&xfrm_state_afinfo_lock); | |
1da177e4 LT |
1573 | return afinfo; |
1574 | } | |
1575 | ||
1576 | static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo) | |
1577 | { | |
546be240 | 1578 | read_unlock(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1579 | } |
1580 | ||
1581 | /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */ | |
1582 | void xfrm_state_delete_tunnel(struct xfrm_state *x) | |
1583 | { | |
1584 | if (x->tunnel) { | |
1585 | struct xfrm_state *t = x->tunnel; | |
1586 | ||
1587 | if (atomic_read(&t->tunnel_users) == 2) | |
1588 | xfrm_state_delete(t); | |
1589 | atomic_dec(&t->tunnel_users); | |
1590 | xfrm_state_put(t); | |
1591 | x->tunnel = NULL; | |
1592 | } | |
1593 | } | |
1594 | EXPORT_SYMBOL(xfrm_state_delete_tunnel); | |
1595 | ||
80b30c10 HX |
1596 | /* |
1597 | * This function is NOT optimal. For example, with ESP it will give an | |
1598 | * MTU that's usually two bytes short of being optimal. However, it will | |
1599 | * usually give an answer that's a multiple of 4 provided the input is | |
1600 | * also a multiple of 4. | |
1601 | */ | |
1da177e4 LT |
1602 | int xfrm_state_mtu(struct xfrm_state *x, int mtu) |
1603 | { | |
1604 | int res = mtu; | |
1605 | ||
1606 | res -= x->props.header_len; | |
1607 | ||
1608 | for (;;) { | |
1609 | int m = res; | |
1610 | ||
1611 | if (m < 68) | |
1612 | return 68; | |
1613 | ||
1614 | spin_lock_bh(&x->lock); | |
1615 | if (x->km.state == XFRM_STATE_VALID && | |
1616 | x->type && x->type->get_max_size) | |
1617 | m = x->type->get_max_size(x, m); | |
1618 | else | |
1619 | m += x->props.header_len; | |
1620 | spin_unlock_bh(&x->lock); | |
1621 | ||
1622 | if (m <= mtu) | |
1623 | break; | |
1624 | res -= (m - mtu); | |
1625 | } | |
1626 | ||
1627 | return res; | |
1628 | } | |
1629 | ||
72cb6962 HX |
1630 | int xfrm_init_state(struct xfrm_state *x) |
1631 | { | |
d094cd83 HX |
1632 | struct xfrm_state_afinfo *afinfo; |
1633 | int family = x->props.family; | |
72cb6962 HX |
1634 | int err; |
1635 | ||
d094cd83 HX |
1636 | err = -EAFNOSUPPORT; |
1637 | afinfo = xfrm_state_get_afinfo(family); | |
1638 | if (!afinfo) | |
1639 | goto error; | |
1640 | ||
1641 | err = 0; | |
1642 | if (afinfo->init_flags) | |
1643 | err = afinfo->init_flags(x); | |
1644 | ||
1645 | xfrm_state_put_afinfo(afinfo); | |
1646 | ||
1647 | if (err) | |
1648 | goto error; | |
1649 | ||
1650 | err = -EPROTONOSUPPORT; | |
1651 | x->type = xfrm_get_type(x->id.proto, family); | |
72cb6962 HX |
1652 | if (x->type == NULL) |
1653 | goto error; | |
1654 | ||
1655 | err = x->type->init_state(x); | |
1656 | if (err) | |
1657 | goto error; | |
1658 | ||
b59f45d0 HX |
1659 | x->mode = xfrm_get_mode(x->props.mode, family); |
1660 | if (x->mode == NULL) | |
1661 | goto error; | |
1662 | ||
72cb6962 HX |
1663 | x->km.state = XFRM_STATE_VALID; |
1664 | ||
1665 | error: | |
1666 | return err; | |
1667 | } | |
1668 | ||
1669 | EXPORT_SYMBOL(xfrm_init_state); | |
1da177e4 LT |
1670 | |
1671 | void __init xfrm_state_init(void) | |
1672 | { | |
f034b5d4 DM |
1673 | unsigned int sz; |
1674 | ||
1675 | sz = sizeof(struct hlist_head) * 8; | |
1676 | ||
1677 | xfrm_state_bydst = xfrm_state_hash_alloc(sz); | |
1678 | xfrm_state_bysrc = xfrm_state_hash_alloc(sz); | |
1679 | xfrm_state_byspi = xfrm_state_hash_alloc(sz); | |
1680 | if (!xfrm_state_bydst || !xfrm_state_bysrc || !xfrm_state_byspi) | |
1681 | panic("XFRM: Cannot allocate bydst/bysrc/byspi hashes."); | |
1682 | xfrm_state_hmask = ((sz / sizeof(struct hlist_head)) - 1); | |
1da177e4 | 1683 | |
1da177e4 LT |
1684 | INIT_WORK(&xfrm_state_gc_work, xfrm_state_gc_task, NULL); |
1685 | } | |
1686 |