Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * xfrm_state.c | |
3 | * | |
4 | * Changes: | |
5 | * Mitsuru KANDA @USAGI | |
6 | * Kazunori MIYAZAWA @USAGI | |
7 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> | |
8 | * IPv6 support | |
9 | * YOSHIFUJI Hideaki @USAGI | |
10 | * Split up af-specific functions | |
11 | * Derek Atkins <derek@ihtfp.com> | |
12 | * Add UDP Encapsulation | |
df71837d | 13 | * |
1da177e4 LT |
14 | */ |
15 | ||
16 | #include <linux/workqueue.h> | |
17 | #include <net/xfrm.h> | |
18 | #include <linux/pfkeyv2.h> | |
19 | #include <linux/ipsec.h> | |
20 | #include <linux/module.h> | |
f034b5d4 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) | |
a624c108 | 38 | 2. Hash table by (daddr,family,reqid) to find what SAs exist for given |
1da177e4 LT |
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; | |
9d4a706d | 56 | static unsigned int xfrm_state_genid; |
f034b5d4 | 57 | |
a624c108 | 58 | static inline unsigned int __xfrm4_addr_hash(xfrm_address_t *addr) |
edcd5821 | 59 | { |
a624c108 | 60 | return ntohl(addr->a4); |
edcd5821 DM |
61 | } |
62 | ||
a624c108 | 63 | static inline unsigned int __xfrm6_addr_hash(xfrm_address_t *addr) |
edcd5821 | 64 | { |
a624c108 | 65 | return ntohl(addr->a6[2]^addr->a6[3]); |
edcd5821 DM |
66 | } |
67 | ||
c1969f29 DM |
68 | static inline unsigned int __xfrm4_daddr_saddr_hash(xfrm_address_t *daddr, xfrm_address_t *saddr) |
69 | { | |
70 | return ntohl(daddr->a4 ^ saddr->a4); | |
71 | } | |
72 | ||
73 | static inline unsigned int __xfrm6_daddr_saddr_hash(xfrm_address_t *daddr, xfrm_address_t *saddr) | |
74 | { | |
75 | return ntohl(daddr->a6[2] ^ daddr->a6[3] ^ | |
76 | saddr->a6[2] ^ saddr->a6[3]); | |
77 | } | |
78 | ||
79 | static inline unsigned int __xfrm_dst_hash(xfrm_address_t *daddr, | |
80 | xfrm_address_t *saddr, | |
a624c108 DM |
81 | u32 reqid, unsigned short family, |
82 | unsigned int hmask) | |
edcd5821 | 83 | { |
a624c108 | 84 | unsigned int h = family ^ reqid; |
edcd5821 DM |
85 | switch (family) { |
86 | case AF_INET: | |
c1969f29 | 87 | h ^= __xfrm4_daddr_saddr_hash(daddr, saddr); |
a624c108 | 88 | break; |
edcd5821 | 89 | case AF_INET6: |
c1969f29 | 90 | h ^= __xfrm6_daddr_saddr_hash(daddr, saddr); |
a624c108 DM |
91 | break; |
92 | }; | |
93 | return (h ^ (h >> 16)) & hmask; | |
edcd5821 DM |
94 | } |
95 | ||
c1969f29 DM |
96 | static inline unsigned int xfrm_dst_hash(xfrm_address_t *daddr, |
97 | xfrm_address_t *saddr, | |
98 | u32 reqid, | |
a624c108 | 99 | unsigned short family) |
f034b5d4 | 100 | { |
c1969f29 | 101 | return __xfrm_dst_hash(daddr, saddr, reqid, family, xfrm_state_hmask); |
f034b5d4 DM |
102 | } |
103 | ||
a624c108 DM |
104 | static inline unsigned __xfrm_src_hash(xfrm_address_t *addr, unsigned short family, |
105 | unsigned int hmask) | |
2770834c | 106 | { |
a624c108 | 107 | unsigned int h = family; |
2770834c DM |
108 | switch (family) { |
109 | case AF_INET: | |
a624c108 DM |
110 | h ^= __xfrm4_addr_hash(addr); |
111 | break; | |
2770834c | 112 | case AF_INET6: |
a624c108 DM |
113 | h ^= __xfrm6_addr_hash(addr); |
114 | break; | |
115 | }; | |
116 | return (h ^ (h >> 16)) & hmask; | |
2770834c DM |
117 | } |
118 | ||
a624c108 | 119 | static inline unsigned xfrm_src_hash(xfrm_address_t *addr, unsigned short family) |
f034b5d4 | 120 | { |
a624c108 | 121 | return __xfrm_src_hash(addr, family, xfrm_state_hmask); |
f034b5d4 DM |
122 | } |
123 | ||
2575b654 | 124 | static inline unsigned int |
c1969f29 DM |
125 | __xfrm_spi_hash(xfrm_address_t *daddr, u32 spi, u8 proto, |
126 | unsigned short family, unsigned int hmask) | |
edcd5821 | 127 | { |
2575b654 | 128 | unsigned int h = spi ^ proto; |
edcd5821 DM |
129 | switch (family) { |
130 | case AF_INET: | |
c1969f29 | 131 | h ^= __xfrm4_addr_hash(daddr); |
2575b654 | 132 | break; |
edcd5821 | 133 | case AF_INET6: |
c1969f29 | 134 | h ^= __xfrm6_addr_hash(daddr); |
2575b654 | 135 | break; |
edcd5821 | 136 | } |
2575b654 | 137 | return (h ^ (h >> 10) ^ (h >> 20)) & hmask; |
edcd5821 DM |
138 | } |
139 | ||
f034b5d4 | 140 | static inline unsigned int |
c1969f29 | 141 | xfrm_spi_hash(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family) |
f034b5d4 | 142 | { |
c1969f29 | 143 | return __xfrm_spi_hash(daddr, spi, proto, family, xfrm_state_hmask); |
f034b5d4 DM |
144 | } |
145 | ||
146 | static struct hlist_head *xfrm_state_hash_alloc(unsigned int sz) | |
147 | { | |
148 | struct hlist_head *n; | |
149 | ||
150 | if (sz <= PAGE_SIZE) | |
151 | n = kmalloc(sz, GFP_KERNEL); | |
152 | else if (hashdist) | |
153 | n = __vmalloc(sz, GFP_KERNEL, PAGE_KERNEL); | |
154 | else | |
155 | n = (struct hlist_head *) | |
156 | __get_free_pages(GFP_KERNEL, get_order(sz)); | |
157 | ||
158 | if (n) | |
159 | memset(n, 0, sz); | |
160 | ||
161 | return n; | |
162 | } | |
163 | ||
164 | static void xfrm_state_hash_free(struct hlist_head *n, unsigned int sz) | |
165 | { | |
166 | if (sz <= PAGE_SIZE) | |
167 | kfree(n); | |
168 | else if (hashdist) | |
169 | vfree(n); | |
170 | else | |
171 | free_pages((unsigned long)n, get_order(sz)); | |
172 | } | |
173 | ||
174 | static void xfrm_hash_transfer(struct hlist_head *list, | |
175 | struct hlist_head *ndsttable, | |
176 | struct hlist_head *nsrctable, | |
177 | struct hlist_head *nspitable, | |
178 | unsigned int nhashmask) | |
179 | { | |
180 | struct hlist_node *entry, *tmp; | |
181 | struct xfrm_state *x; | |
182 | ||
183 | hlist_for_each_entry_safe(x, entry, tmp, list, bydst) { | |
184 | unsigned int h; | |
185 | ||
c1969f29 DM |
186 | h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr, |
187 | x->props.reqid, x->props.family, | |
188 | nhashmask); | |
f034b5d4 DM |
189 | hlist_add_head(&x->bydst, ndsttable+h); |
190 | ||
191 | h = __xfrm_src_hash(&x->props.saddr, x->props.family, | |
192 | nhashmask); | |
193 | hlist_add_head(&x->bysrc, nsrctable+h); | |
194 | ||
195 | h = __xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, | |
196 | x->props.family, nhashmask); | |
197 | hlist_add_head(&x->byspi, nspitable+h); | |
198 | } | |
199 | } | |
200 | ||
201 | static unsigned long xfrm_hash_new_size(void) | |
202 | { | |
203 | return ((xfrm_state_hmask + 1) << 1) * | |
204 | sizeof(struct hlist_head); | |
205 | } | |
206 | ||
207 | static DEFINE_MUTEX(hash_resize_mutex); | |
208 | ||
209 | static void xfrm_hash_resize(void *__unused) | |
210 | { | |
211 | struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi; | |
212 | unsigned long nsize, osize; | |
213 | unsigned int nhashmask, ohashmask; | |
214 | int i; | |
215 | ||
216 | mutex_lock(&hash_resize_mutex); | |
217 | ||
218 | nsize = xfrm_hash_new_size(); | |
219 | ndst = xfrm_state_hash_alloc(nsize); | |
220 | if (!ndst) | |
221 | goto out_unlock; | |
222 | nsrc = xfrm_state_hash_alloc(nsize); | |
223 | if (!nsrc) { | |
224 | xfrm_state_hash_free(ndst, nsize); | |
225 | goto out_unlock; | |
226 | } | |
227 | nspi = xfrm_state_hash_alloc(nsize); | |
228 | if (!nspi) { | |
229 | xfrm_state_hash_free(ndst, nsize); | |
230 | xfrm_state_hash_free(nsrc, nsize); | |
231 | goto out_unlock; | |
232 | } | |
233 | ||
234 | spin_lock_bh(&xfrm_state_lock); | |
235 | ||
236 | nhashmask = (nsize / sizeof(struct hlist_head)) - 1U; | |
237 | for (i = xfrm_state_hmask; i >= 0; i--) | |
238 | xfrm_hash_transfer(xfrm_state_bydst+i, ndst, nsrc, nspi, | |
239 | nhashmask); | |
240 | ||
241 | odst = xfrm_state_bydst; | |
242 | osrc = xfrm_state_bysrc; | |
243 | ospi = xfrm_state_byspi; | |
244 | ohashmask = xfrm_state_hmask; | |
245 | ||
246 | xfrm_state_bydst = ndst; | |
247 | xfrm_state_bysrc = nsrc; | |
248 | xfrm_state_byspi = nspi; | |
249 | xfrm_state_hmask = nhashmask; | |
250 | ||
251 | spin_unlock_bh(&xfrm_state_lock); | |
252 | ||
253 | osize = (ohashmask + 1) * sizeof(struct hlist_head); | |
254 | xfrm_state_hash_free(odst, osize); | |
255 | xfrm_state_hash_free(osrc, osize); | |
256 | xfrm_state_hash_free(ospi, osize); | |
257 | ||
258 | out_unlock: | |
259 | mutex_unlock(&hash_resize_mutex); | |
260 | } | |
261 | ||
262 | static DECLARE_WORK(xfrm_hash_work, xfrm_hash_resize, NULL); | |
263 | ||
1da177e4 LT |
264 | DECLARE_WAIT_QUEUE_HEAD(km_waitq); |
265 | EXPORT_SYMBOL(km_waitq); | |
266 | ||
267 | static DEFINE_RWLOCK(xfrm_state_afinfo_lock); | |
268 | static struct xfrm_state_afinfo *xfrm_state_afinfo[NPROTO]; | |
269 | ||
270 | static struct work_struct xfrm_state_gc_work; | |
8f126e37 | 271 | static HLIST_HEAD(xfrm_state_gc_list); |
1da177e4 LT |
272 | static DEFINE_SPINLOCK(xfrm_state_gc_lock); |
273 | ||
53bc6b4d | 274 | int __xfrm_state_delete(struct xfrm_state *x); |
1da177e4 LT |
275 | |
276 | static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family); | |
277 | static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo); | |
278 | ||
980ebd25 | 279 | int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); |
53bc6b4d | 280 | void km_state_expired(struct xfrm_state *x, int hard, u32 pid); |
1da177e4 LT |
281 | |
282 | static void xfrm_state_gc_destroy(struct xfrm_state *x) | |
283 | { | |
a47f0ce0 DM |
284 | del_timer_sync(&x->timer); |
285 | del_timer_sync(&x->rtimer); | |
a51482bd JJ |
286 | kfree(x->aalg); |
287 | kfree(x->ealg); | |
288 | kfree(x->calg); | |
289 | kfree(x->encap); | |
060f02a3 | 290 | kfree(x->coaddr); |
b59f45d0 HX |
291 | if (x->mode) |
292 | xfrm_put_mode(x->mode); | |
1da177e4 LT |
293 | if (x->type) { |
294 | x->type->destructor(x); | |
295 | xfrm_put_type(x->type); | |
296 | } | |
df71837d | 297 | security_xfrm_state_free(x); |
1da177e4 LT |
298 | kfree(x); |
299 | } | |
300 | ||
301 | static void xfrm_state_gc_task(void *data) | |
302 | { | |
303 | struct xfrm_state *x; | |
8f126e37 DM |
304 | struct hlist_node *entry, *tmp; |
305 | struct hlist_head gc_list; | |
1da177e4 | 306 | |
1da177e4 | 307 | spin_lock_bh(&xfrm_state_gc_lock); |
8f126e37 DM |
308 | gc_list.first = xfrm_state_gc_list.first; |
309 | INIT_HLIST_HEAD(&xfrm_state_gc_list); | |
1da177e4 LT |
310 | spin_unlock_bh(&xfrm_state_gc_lock); |
311 | ||
8f126e37 | 312 | hlist_for_each_entry_safe(x, entry, tmp, &gc_list, bydst) |
1da177e4 | 313 | xfrm_state_gc_destroy(x); |
8f126e37 | 314 | |
1da177e4 LT |
315 | wake_up(&km_waitq); |
316 | } | |
317 | ||
318 | static inline unsigned long make_jiffies(long secs) | |
319 | { | |
320 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
321 | return MAX_SCHEDULE_TIMEOUT-1; | |
322 | else | |
323 | return secs*HZ; | |
324 | } | |
325 | ||
326 | static void xfrm_timer_handler(unsigned long data) | |
327 | { | |
328 | struct xfrm_state *x = (struct xfrm_state*)data; | |
329 | unsigned long now = (unsigned long)xtime.tv_sec; | |
330 | long next = LONG_MAX; | |
331 | int warn = 0; | |
332 | ||
333 | spin_lock(&x->lock); | |
334 | if (x->km.state == XFRM_STATE_DEAD) | |
335 | goto out; | |
336 | if (x->km.state == XFRM_STATE_EXPIRED) | |
337 | goto expired; | |
338 | if (x->lft.hard_add_expires_seconds) { | |
339 | long tmo = x->lft.hard_add_expires_seconds + | |
340 | x->curlft.add_time - now; | |
341 | if (tmo <= 0) | |
342 | goto expired; | |
343 | if (tmo < next) | |
344 | next = tmo; | |
345 | } | |
346 | if (x->lft.hard_use_expires_seconds) { | |
347 | long tmo = x->lft.hard_use_expires_seconds + | |
348 | (x->curlft.use_time ? : now) - now; | |
349 | if (tmo <= 0) | |
350 | goto expired; | |
351 | if (tmo < next) | |
352 | next = tmo; | |
353 | } | |
354 | if (x->km.dying) | |
355 | goto resched; | |
356 | if (x->lft.soft_add_expires_seconds) { | |
357 | long tmo = x->lft.soft_add_expires_seconds + | |
358 | x->curlft.add_time - now; | |
359 | if (tmo <= 0) | |
360 | warn = 1; | |
361 | else if (tmo < next) | |
362 | next = tmo; | |
363 | } | |
364 | if (x->lft.soft_use_expires_seconds) { | |
365 | long tmo = x->lft.soft_use_expires_seconds + | |
366 | (x->curlft.use_time ? : now) - now; | |
367 | if (tmo <= 0) | |
368 | warn = 1; | |
369 | else if (tmo < next) | |
370 | next = tmo; | |
371 | } | |
372 | ||
4666faab | 373 | x->km.dying = warn; |
1da177e4 | 374 | if (warn) |
53bc6b4d | 375 | km_state_expired(x, 0, 0); |
1da177e4 | 376 | resched: |
a47f0ce0 DM |
377 | if (next != LONG_MAX) |
378 | mod_timer(&x->timer, jiffies + make_jiffies(next)); | |
379 | ||
1da177e4 LT |
380 | goto out; |
381 | ||
382 | expired: | |
383 | if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) { | |
384 | x->km.state = XFRM_STATE_EXPIRED; | |
385 | wake_up(&km_waitq); | |
386 | next = 2; | |
387 | goto resched; | |
388 | } | |
4666faab | 389 | if (!__xfrm_state_delete(x) && x->id.spi) |
53bc6b4d | 390 | km_state_expired(x, 1, 0); |
1da177e4 LT |
391 | |
392 | out: | |
393 | spin_unlock(&x->lock); | |
1da177e4 LT |
394 | } |
395 | ||
0ac84752 DM |
396 | static void xfrm_replay_timer_handler(unsigned long data); |
397 | ||
1da177e4 LT |
398 | struct xfrm_state *xfrm_state_alloc(void) |
399 | { | |
400 | struct xfrm_state *x; | |
401 | ||
0da974f4 | 402 | x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC); |
1da177e4 LT |
403 | |
404 | if (x) { | |
1da177e4 LT |
405 | atomic_set(&x->refcnt, 1); |
406 | atomic_set(&x->tunnel_users, 0); | |
8f126e37 DM |
407 | INIT_HLIST_NODE(&x->bydst); |
408 | INIT_HLIST_NODE(&x->bysrc); | |
409 | INIT_HLIST_NODE(&x->byspi); | |
1da177e4 LT |
410 | init_timer(&x->timer); |
411 | x->timer.function = xfrm_timer_handler; | |
412 | x->timer.data = (unsigned long)x; | |
f8cd5488 JHS |
413 | init_timer(&x->rtimer); |
414 | x->rtimer.function = xfrm_replay_timer_handler; | |
415 | x->rtimer.data = (unsigned long)x; | |
1da177e4 LT |
416 | x->curlft.add_time = (unsigned long)xtime.tv_sec; |
417 | x->lft.soft_byte_limit = XFRM_INF; | |
418 | x->lft.soft_packet_limit = XFRM_INF; | |
419 | x->lft.hard_byte_limit = XFRM_INF; | |
420 | x->lft.hard_packet_limit = XFRM_INF; | |
f8cd5488 JHS |
421 | x->replay_maxage = 0; |
422 | x->replay_maxdiff = 0; | |
1da177e4 LT |
423 | spin_lock_init(&x->lock); |
424 | } | |
425 | return x; | |
426 | } | |
427 | EXPORT_SYMBOL(xfrm_state_alloc); | |
428 | ||
429 | void __xfrm_state_destroy(struct xfrm_state *x) | |
430 | { | |
431 | BUG_TRAP(x->km.state == XFRM_STATE_DEAD); | |
432 | ||
433 | spin_lock_bh(&xfrm_state_gc_lock); | |
8f126e37 | 434 | hlist_add_head(&x->bydst, &xfrm_state_gc_list); |
1da177e4 LT |
435 | spin_unlock_bh(&xfrm_state_gc_lock); |
436 | schedule_work(&xfrm_state_gc_work); | |
437 | } | |
438 | EXPORT_SYMBOL(__xfrm_state_destroy); | |
439 | ||
53bc6b4d | 440 | int __xfrm_state_delete(struct xfrm_state *x) |
1da177e4 | 441 | { |
26b15dad JHS |
442 | int err = -ESRCH; |
443 | ||
1da177e4 LT |
444 | if (x->km.state != XFRM_STATE_DEAD) { |
445 | x->km.state = XFRM_STATE_DEAD; | |
446 | spin_lock(&xfrm_state_lock); | |
8f126e37 | 447 | hlist_del(&x->bydst); |
8f126e37 | 448 | hlist_del(&x->bysrc); |
a47f0ce0 | 449 | if (x->id.spi) |
8f126e37 | 450 | hlist_del(&x->byspi); |
f034b5d4 | 451 | xfrm_state_num--; |
1da177e4 | 452 | spin_unlock(&xfrm_state_lock); |
1da177e4 | 453 | |
1da177e4 LT |
454 | /* All xfrm_state objects are created by xfrm_state_alloc. |
455 | * The xfrm_state_alloc call gives a reference, and that | |
456 | * is what we are dropping here. | |
457 | */ | |
21380b81 | 458 | __xfrm_state_put(x); |
26b15dad | 459 | err = 0; |
1da177e4 | 460 | } |
26b15dad JHS |
461 | |
462 | return err; | |
1da177e4 | 463 | } |
53bc6b4d | 464 | EXPORT_SYMBOL(__xfrm_state_delete); |
1da177e4 | 465 | |
26b15dad | 466 | int xfrm_state_delete(struct xfrm_state *x) |
1da177e4 | 467 | { |
26b15dad JHS |
468 | int err; |
469 | ||
1da177e4 | 470 | spin_lock_bh(&x->lock); |
26b15dad | 471 | err = __xfrm_state_delete(x); |
1da177e4 | 472 | spin_unlock_bh(&x->lock); |
26b15dad JHS |
473 | |
474 | return err; | |
1da177e4 LT |
475 | } |
476 | EXPORT_SYMBOL(xfrm_state_delete); | |
477 | ||
478 | void xfrm_state_flush(u8 proto) | |
479 | { | |
480 | int i; | |
1da177e4 LT |
481 | |
482 | spin_lock_bh(&xfrm_state_lock); | |
f034b5d4 | 483 | for (i = 0; i < xfrm_state_hmask; i++) { |
8f126e37 DM |
484 | struct hlist_node *entry; |
485 | struct xfrm_state *x; | |
1da177e4 | 486 | restart: |
8f126e37 | 487 | hlist_for_each_entry(x, entry, xfrm_state_bydst+i, bydst) { |
1da177e4 | 488 | if (!xfrm_state_kern(x) && |
5794708f | 489 | xfrm_id_proto_match(x->id.proto, proto)) { |
1da177e4 LT |
490 | xfrm_state_hold(x); |
491 | spin_unlock_bh(&xfrm_state_lock); | |
492 | ||
493 | xfrm_state_delete(x); | |
494 | xfrm_state_put(x); | |
495 | ||
496 | spin_lock_bh(&xfrm_state_lock); | |
497 | goto restart; | |
498 | } | |
499 | } | |
500 | } | |
501 | spin_unlock_bh(&xfrm_state_lock); | |
502 | wake_up(&km_waitq); | |
503 | } | |
504 | EXPORT_SYMBOL(xfrm_state_flush); | |
505 | ||
506 | static int | |
507 | xfrm_init_tempsel(struct xfrm_state *x, struct flowi *fl, | |
508 | struct xfrm_tmpl *tmpl, | |
509 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
510 | unsigned short family) | |
511 | { | |
512 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
513 | if (!afinfo) | |
514 | return -1; | |
515 | afinfo->init_tempsel(x, fl, tmpl, daddr, saddr); | |
516 | xfrm_state_put_afinfo(afinfo); | |
517 | return 0; | |
518 | } | |
519 | ||
edcd5821 DM |
520 | static struct xfrm_state *__xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family) |
521 | { | |
522 | unsigned int h = xfrm_spi_hash(daddr, spi, proto, family); | |
523 | struct xfrm_state *x; | |
8f126e37 | 524 | struct hlist_node *entry; |
edcd5821 | 525 | |
8f126e37 | 526 | hlist_for_each_entry(x, entry, xfrm_state_byspi+h, byspi) { |
edcd5821 DM |
527 | if (x->props.family != family || |
528 | x->id.spi != spi || | |
529 | x->id.proto != proto) | |
530 | continue; | |
531 | ||
532 | switch (family) { | |
533 | case AF_INET: | |
534 | if (x->id.daddr.a4 != daddr->a4) | |
535 | continue; | |
536 | break; | |
537 | case AF_INET6: | |
538 | if (!ipv6_addr_equal((struct in6_addr *)daddr, | |
539 | (struct in6_addr *) | |
540 | x->id.daddr.a6)) | |
541 | continue; | |
542 | break; | |
543 | }; | |
544 | ||
545 | xfrm_state_hold(x); | |
546 | return x; | |
547 | } | |
548 | ||
549 | return NULL; | |
550 | } | |
551 | ||
552 | static struct xfrm_state *__xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family) | |
553 | { | |
554 | unsigned int h = xfrm_src_hash(saddr, family); | |
555 | struct xfrm_state *x; | |
8f126e37 | 556 | struct hlist_node *entry; |
edcd5821 | 557 | |
8f126e37 | 558 | hlist_for_each_entry(x, entry, xfrm_state_bysrc+h, bysrc) { |
edcd5821 DM |
559 | if (x->props.family != family || |
560 | x->id.proto != proto) | |
561 | continue; | |
562 | ||
563 | switch (family) { | |
564 | case AF_INET: | |
565 | if (x->id.daddr.a4 != daddr->a4 || | |
566 | x->props.saddr.a4 != saddr->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 | !ipv6_addr_equal((struct in6_addr *)saddr, | |
574 | (struct in6_addr *) | |
575 | x->props.saddr.a6)) | |
576 | continue; | |
577 | break; | |
578 | }; | |
579 | ||
580 | xfrm_state_hold(x); | |
581 | return x; | |
582 | } | |
583 | ||
584 | return NULL; | |
585 | } | |
586 | ||
587 | static inline struct xfrm_state * | |
588 | __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family) | |
589 | { | |
590 | if (use_spi) | |
591 | return __xfrm_state_lookup(&x->id.daddr, x->id.spi, | |
592 | x->id.proto, family); | |
593 | else | |
594 | return __xfrm_state_lookup_byaddr(&x->id.daddr, | |
595 | &x->props.saddr, | |
596 | x->id.proto, family); | |
597 | } | |
598 | ||
1da177e4 LT |
599 | struct xfrm_state * |
600 | xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, | |
601 | struct flowi *fl, struct xfrm_tmpl *tmpl, | |
602 | struct xfrm_policy *pol, int *err, | |
603 | unsigned short family) | |
604 | { | |
c1969f29 | 605 | unsigned int h = xfrm_dst_hash(daddr, saddr, tmpl->reqid, family); |
8f126e37 | 606 | struct hlist_node *entry; |
1da177e4 LT |
607 | struct xfrm_state *x, *x0; |
608 | int acquire_in_progress = 0; | |
609 | int error = 0; | |
610 | struct xfrm_state *best = NULL; | |
1da177e4 | 611 | |
1da177e4 | 612 | spin_lock_bh(&xfrm_state_lock); |
8f126e37 | 613 | hlist_for_each_entry(x, entry, xfrm_state_bydst+h, bydst) { |
1da177e4 LT |
614 | if (x->props.family == family && |
615 | x->props.reqid == tmpl->reqid && | |
fbd9a5b4 | 616 | !(x->props.flags & XFRM_STATE_WILDRECV) && |
1da177e4 LT |
617 | xfrm_state_addr_check(x, daddr, saddr, family) && |
618 | tmpl->mode == x->props.mode && | |
619 | tmpl->id.proto == x->id.proto && | |
620 | (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) { | |
621 | /* Resolution logic: | |
622 | 1. There is a valid state with matching selector. | |
623 | Done. | |
624 | 2. Valid state with inappropriate selector. Skip. | |
625 | ||
626 | Entering area of "sysdeps". | |
627 | ||
628 | 3. If state is not valid, selector is temporary, | |
629 | it selects only session which triggered | |
630 | previous resolution. Key manager will do | |
631 | something to install a state with proper | |
632 | selector. | |
633 | */ | |
634 | if (x->km.state == XFRM_STATE_VALID) { | |
df71837d | 635 | if (!xfrm_selector_match(&x->sel, fl, family) || |
e0d1caa7 | 636 | !security_xfrm_state_pol_flow_match(x, pol, fl)) |
1da177e4 LT |
637 | continue; |
638 | if (!best || | |
639 | best->km.dying > x->km.dying || | |
640 | (best->km.dying == x->km.dying && | |
641 | best->curlft.add_time < x->curlft.add_time)) | |
642 | best = x; | |
643 | } else if (x->km.state == XFRM_STATE_ACQ) { | |
644 | acquire_in_progress = 1; | |
645 | } else if (x->km.state == XFRM_STATE_ERROR || | |
646 | x->km.state == XFRM_STATE_EXPIRED) { | |
df71837d | 647 | if (xfrm_selector_match(&x->sel, fl, family) && |
e0d1caa7 | 648 | security_xfrm_state_pol_flow_match(x, pol, fl)) |
1da177e4 LT |
649 | error = -ESRCH; |
650 | } | |
651 | } | |
652 | } | |
653 | ||
654 | x = best; | |
655 | if (!x && !error && !acquire_in_progress) { | |
5c5d281a | 656 | if (tmpl->id.spi && |
edcd5821 DM |
657 | (x0 = __xfrm_state_lookup(daddr, tmpl->id.spi, |
658 | tmpl->id.proto, family)) != NULL) { | |
1da177e4 LT |
659 | xfrm_state_put(x0); |
660 | error = -EEXIST; | |
661 | goto out; | |
662 | } | |
663 | x = xfrm_state_alloc(); | |
664 | if (x == NULL) { | |
665 | error = -ENOMEM; | |
666 | goto out; | |
667 | } | |
668 | /* Initialize temporary selector matching only | |
669 | * to current session. */ | |
670 | xfrm_init_tempsel(x, fl, tmpl, daddr, saddr, family); | |
671 | ||
e0d1caa7 VY |
672 | error = security_xfrm_state_alloc_acquire(x, pol->security, fl->secid); |
673 | if (error) { | |
674 | x->km.state = XFRM_STATE_DEAD; | |
675 | xfrm_state_put(x); | |
676 | x = NULL; | |
677 | goto out; | |
678 | } | |
679 | ||
1da177e4 LT |
680 | if (km_query(x, tmpl, pol) == 0) { |
681 | x->km.state = XFRM_STATE_ACQ; | |
8f126e37 | 682 | hlist_add_head(&x->bydst, xfrm_state_bydst+h); |
8f126e37 DM |
683 | h = xfrm_src_hash(saddr, family); |
684 | hlist_add_head(&x->bysrc, xfrm_state_bysrc+h); | |
1da177e4 LT |
685 | if (x->id.spi) { |
686 | h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, family); | |
8f126e37 | 687 | hlist_add_head(&x->byspi, xfrm_state_byspi+h); |
1da177e4 LT |
688 | } |
689 | x->lft.hard_add_expires_seconds = XFRM_ACQ_EXPIRES; | |
1da177e4 LT |
690 | x->timer.expires = jiffies + XFRM_ACQ_EXPIRES*HZ; |
691 | add_timer(&x->timer); | |
692 | } else { | |
693 | x->km.state = XFRM_STATE_DEAD; | |
694 | xfrm_state_put(x); | |
695 | x = NULL; | |
696 | error = -ESRCH; | |
697 | } | |
698 | } | |
699 | out: | |
700 | if (x) | |
701 | xfrm_state_hold(x); | |
702 | else | |
703 | *err = acquire_in_progress ? -EAGAIN : error; | |
704 | spin_unlock_bh(&xfrm_state_lock); | |
1da177e4 LT |
705 | return x; |
706 | } | |
707 | ||
708 | static void __xfrm_state_insert(struct xfrm_state *x) | |
709 | { | |
a624c108 | 710 | unsigned int h; |
1da177e4 | 711 | |
9d4a706d DM |
712 | x->genid = ++xfrm_state_genid; |
713 | ||
c1969f29 DM |
714 | h = xfrm_dst_hash(&x->id.daddr, &x->props.saddr, |
715 | x->props.reqid, x->props.family); | |
8f126e37 | 716 | hlist_add_head(&x->bydst, xfrm_state_bydst+h); |
1da177e4 | 717 | |
6c44e6b7 | 718 | h = xfrm_src_hash(&x->props.saddr, x->props.family); |
8f126e37 | 719 | hlist_add_head(&x->bysrc, xfrm_state_bysrc+h); |
1da177e4 | 720 | |
6c44e6b7 MN |
721 | if (xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY)) { |
722 | h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, | |
723 | x->props.family); | |
724 | ||
8f126e37 | 725 | hlist_add_head(&x->byspi, xfrm_state_byspi+h); |
6c44e6b7 MN |
726 | } |
727 | ||
a47f0ce0 DM |
728 | mod_timer(&x->timer, jiffies + HZ); |
729 | if (x->replay_maxage) | |
730 | mod_timer(&x->rtimer, jiffies + x->replay_maxage); | |
f8cd5488 | 731 | |
1da177e4 | 732 | wake_up(&km_waitq); |
f034b5d4 DM |
733 | |
734 | xfrm_state_num++; | |
735 | ||
736 | if (x->bydst.next != NULL && | |
737 | (xfrm_state_hmask + 1) < xfrm_state_hashmax && | |
738 | xfrm_state_num > xfrm_state_hmask) | |
739 | schedule_work(&xfrm_hash_work); | |
1da177e4 LT |
740 | } |
741 | ||
c7f5ea3a DM |
742 | /* xfrm_state_lock is held */ |
743 | static void __xfrm_state_bump_genids(struct xfrm_state *xnew) | |
744 | { | |
745 | unsigned short family = xnew->props.family; | |
746 | u32 reqid = xnew->props.reqid; | |
747 | struct xfrm_state *x; | |
748 | struct hlist_node *entry; | |
749 | unsigned int h; | |
750 | ||
c1969f29 | 751 | h = xfrm_dst_hash(&xnew->id.daddr, &xnew->props.saddr, reqid, family); |
c7f5ea3a DM |
752 | hlist_for_each_entry(x, entry, xfrm_state_bydst+h, bydst) { |
753 | if (x->props.family == family && | |
754 | x->props.reqid == reqid && | |
c1969f29 DM |
755 | !xfrm_addr_cmp(&x->id.daddr, &xnew->id.daddr, family) && |
756 | !xfrm_addr_cmp(&x->props.saddr, &xnew->props.saddr, family)) | |
c7f5ea3a DM |
757 | x->genid = xfrm_state_genid; |
758 | } | |
759 | } | |
760 | ||
1da177e4 LT |
761 | void xfrm_state_insert(struct xfrm_state *x) |
762 | { | |
763 | spin_lock_bh(&xfrm_state_lock); | |
c7f5ea3a | 764 | __xfrm_state_bump_genids(x); |
1da177e4 LT |
765 | __xfrm_state_insert(x); |
766 | spin_unlock_bh(&xfrm_state_lock); | |
767 | } | |
768 | EXPORT_SYMBOL(xfrm_state_insert); | |
769 | ||
2770834c DM |
770 | /* xfrm_state_lock is held */ |
771 | 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) | |
772 | { | |
c1969f29 | 773 | unsigned int h = xfrm_dst_hash(daddr, saddr, reqid, family); |
8f126e37 | 774 | struct hlist_node *entry; |
2770834c DM |
775 | struct xfrm_state *x; |
776 | ||
8f126e37 | 777 | hlist_for_each_entry(x, entry, xfrm_state_bydst+h, bydst) { |
2770834c DM |
778 | if (x->props.reqid != reqid || |
779 | x->props.mode != mode || | |
780 | x->props.family != family || | |
781 | x->km.state != XFRM_STATE_ACQ || | |
782 | x->id.spi != 0) | |
783 | continue; | |
784 | ||
785 | switch (family) { | |
786 | case AF_INET: | |
787 | if (x->id.daddr.a4 != daddr->a4 || | |
788 | x->props.saddr.a4 != saddr->a4) | |
789 | continue; | |
790 | break; | |
791 | case AF_INET6: | |
792 | if (!ipv6_addr_equal((struct in6_addr *)x->id.daddr.a6, | |
793 | (struct in6_addr *)daddr) || | |
794 | !ipv6_addr_equal((struct in6_addr *) | |
795 | x->props.saddr.a6, | |
796 | (struct in6_addr *)saddr)) | |
797 | continue; | |
798 | break; | |
799 | }; | |
800 | ||
801 | xfrm_state_hold(x); | |
802 | return x; | |
803 | } | |
804 | ||
805 | if (!create) | |
806 | return NULL; | |
807 | ||
808 | x = xfrm_state_alloc(); | |
809 | if (likely(x)) { | |
810 | switch (family) { | |
811 | case AF_INET: | |
812 | x->sel.daddr.a4 = daddr->a4; | |
813 | x->sel.saddr.a4 = saddr->a4; | |
814 | x->sel.prefixlen_d = 32; | |
815 | x->sel.prefixlen_s = 32; | |
816 | x->props.saddr.a4 = saddr->a4; | |
817 | x->id.daddr.a4 = daddr->a4; | |
818 | break; | |
819 | ||
820 | case AF_INET6: | |
821 | ipv6_addr_copy((struct in6_addr *)x->sel.daddr.a6, | |
822 | (struct in6_addr *)daddr); | |
823 | ipv6_addr_copy((struct in6_addr *)x->sel.saddr.a6, | |
824 | (struct in6_addr *)saddr); | |
825 | x->sel.prefixlen_d = 128; | |
826 | x->sel.prefixlen_s = 128; | |
827 | ipv6_addr_copy((struct in6_addr *)x->props.saddr.a6, | |
828 | (struct in6_addr *)saddr); | |
829 | ipv6_addr_copy((struct in6_addr *)x->id.daddr.a6, | |
830 | (struct in6_addr *)daddr); | |
831 | break; | |
832 | }; | |
833 | ||
834 | x->km.state = XFRM_STATE_ACQ; | |
835 | x->id.proto = proto; | |
836 | x->props.family = family; | |
837 | x->props.mode = mode; | |
838 | x->props.reqid = reqid; | |
839 | x->lft.hard_add_expires_seconds = XFRM_ACQ_EXPIRES; | |
840 | xfrm_state_hold(x); | |
841 | x->timer.expires = jiffies + XFRM_ACQ_EXPIRES*HZ; | |
842 | add_timer(&x->timer); | |
8f126e37 | 843 | hlist_add_head(&x->bydst, xfrm_state_bydst+h); |
2770834c | 844 | h = xfrm_src_hash(saddr, family); |
8f126e37 | 845 | hlist_add_head(&x->bysrc, xfrm_state_bysrc+h); |
2770834c DM |
846 | wake_up(&km_waitq); |
847 | } | |
848 | ||
849 | return x; | |
850 | } | |
851 | ||
1da177e4 LT |
852 | static struct xfrm_state *__xfrm_find_acq_byseq(u32 seq); |
853 | ||
854 | int xfrm_state_add(struct xfrm_state *x) | |
855 | { | |
1da177e4 LT |
856 | struct xfrm_state *x1; |
857 | int family; | |
858 | int err; | |
eb2971b6 | 859 | int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); |
1da177e4 LT |
860 | |
861 | family = x->props.family; | |
1da177e4 LT |
862 | |
863 | spin_lock_bh(&xfrm_state_lock); | |
864 | ||
edcd5821 | 865 | x1 = __xfrm_state_locate(x, use_spi, family); |
1da177e4 LT |
866 | if (x1) { |
867 | xfrm_state_put(x1); | |
868 | x1 = NULL; | |
869 | err = -EEXIST; | |
870 | goto out; | |
871 | } | |
872 | ||
eb2971b6 | 873 | if (use_spi && x->km.seq) { |
1da177e4 LT |
874 | x1 = __xfrm_find_acq_byseq(x->km.seq); |
875 | if (x1 && xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family)) { | |
876 | xfrm_state_put(x1); | |
877 | x1 = NULL; | |
878 | } | |
879 | } | |
880 | ||
eb2971b6 | 881 | if (use_spi && !x1) |
2770834c DM |
882 | x1 = __find_acq_core(family, x->props.mode, x->props.reqid, |
883 | x->id.proto, | |
884 | &x->id.daddr, &x->props.saddr, 0); | |
1da177e4 | 885 | |
c7f5ea3a | 886 | __xfrm_state_bump_genids(x); |
1da177e4 LT |
887 | __xfrm_state_insert(x); |
888 | err = 0; | |
889 | ||
890 | out: | |
891 | spin_unlock_bh(&xfrm_state_lock); | |
1da177e4 LT |
892 | |
893 | if (x1) { | |
894 | xfrm_state_delete(x1); | |
895 | xfrm_state_put(x1); | |
896 | } | |
897 | ||
898 | return err; | |
899 | } | |
900 | EXPORT_SYMBOL(xfrm_state_add); | |
901 | ||
902 | int xfrm_state_update(struct xfrm_state *x) | |
903 | { | |
1da177e4 LT |
904 | struct xfrm_state *x1; |
905 | int err; | |
eb2971b6 | 906 | int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); |
1da177e4 | 907 | |
1da177e4 | 908 | spin_lock_bh(&xfrm_state_lock); |
edcd5821 | 909 | x1 = __xfrm_state_locate(x, use_spi, x->props.family); |
1da177e4 LT |
910 | |
911 | err = -ESRCH; | |
912 | if (!x1) | |
913 | goto out; | |
914 | ||
915 | if (xfrm_state_kern(x1)) { | |
916 | xfrm_state_put(x1); | |
917 | err = -EEXIST; | |
918 | goto out; | |
919 | } | |
920 | ||
921 | if (x1->km.state == XFRM_STATE_ACQ) { | |
922 | __xfrm_state_insert(x); | |
923 | x = NULL; | |
924 | } | |
925 | err = 0; | |
926 | ||
927 | out: | |
928 | spin_unlock_bh(&xfrm_state_lock); | |
1da177e4 LT |
929 | |
930 | if (err) | |
931 | return err; | |
932 | ||
933 | if (!x) { | |
934 | xfrm_state_delete(x1); | |
935 | xfrm_state_put(x1); | |
936 | return 0; | |
937 | } | |
938 | ||
939 | err = -EINVAL; | |
940 | spin_lock_bh(&x1->lock); | |
941 | if (likely(x1->km.state == XFRM_STATE_VALID)) { | |
942 | if (x->encap && x1->encap) | |
943 | memcpy(x1->encap, x->encap, sizeof(*x1->encap)); | |
060f02a3 NT |
944 | if (x->coaddr && x1->coaddr) { |
945 | memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr)); | |
946 | } | |
947 | if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel))) | |
948 | memcpy(&x1->sel, &x->sel, sizeof(x1->sel)); | |
1da177e4 LT |
949 | memcpy(&x1->lft, &x->lft, sizeof(x1->lft)); |
950 | x1->km.dying = 0; | |
951 | ||
a47f0ce0 | 952 | mod_timer(&x1->timer, jiffies + HZ); |
1da177e4 LT |
953 | if (x1->curlft.use_time) |
954 | xfrm_state_check_expire(x1); | |
955 | ||
956 | err = 0; | |
957 | } | |
958 | spin_unlock_bh(&x1->lock); | |
959 | ||
960 | xfrm_state_put(x1); | |
961 | ||
962 | return err; | |
963 | } | |
964 | EXPORT_SYMBOL(xfrm_state_update); | |
965 | ||
966 | int xfrm_state_check_expire(struct xfrm_state *x) | |
967 | { | |
968 | if (!x->curlft.use_time) | |
969 | x->curlft.use_time = (unsigned long)xtime.tv_sec; | |
970 | ||
971 | if (x->km.state != XFRM_STATE_VALID) | |
972 | return -EINVAL; | |
973 | ||
974 | if (x->curlft.bytes >= x->lft.hard_byte_limit || | |
975 | x->curlft.packets >= x->lft.hard_packet_limit) { | |
4666faab | 976 | x->km.state = XFRM_STATE_EXPIRED; |
a47f0ce0 | 977 | mod_timer(&x->timer, jiffies); |
1da177e4 LT |
978 | return -EINVAL; |
979 | } | |
980 | ||
981 | if (!x->km.dying && | |
982 | (x->curlft.bytes >= x->lft.soft_byte_limit || | |
4666faab HX |
983 | x->curlft.packets >= x->lft.soft_packet_limit)) { |
984 | x->km.dying = 1; | |
53bc6b4d | 985 | km_state_expired(x, 0, 0); |
4666faab | 986 | } |
1da177e4 LT |
987 | return 0; |
988 | } | |
989 | EXPORT_SYMBOL(xfrm_state_check_expire); | |
990 | ||
991 | static int xfrm_state_check_space(struct xfrm_state *x, struct sk_buff *skb) | |
992 | { | |
993 | int nhead = x->props.header_len + LL_RESERVED_SPACE(skb->dst->dev) | |
994 | - skb_headroom(skb); | |
995 | ||
996 | if (nhead > 0) | |
997 | return pskb_expand_head(skb, nhead, 0, GFP_ATOMIC); | |
998 | ||
999 | /* Check tail too... */ | |
1000 | return 0; | |
1001 | } | |
1002 | ||
1003 | int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb) | |
1004 | { | |
1005 | int err = xfrm_state_check_expire(x); | |
1006 | if (err < 0) | |
1007 | goto err; | |
1008 | err = xfrm_state_check_space(x, skb); | |
1009 | err: | |
1010 | return err; | |
1011 | } | |
1012 | EXPORT_SYMBOL(xfrm_state_check); | |
1013 | ||
1014 | struct xfrm_state * | |
1015 | xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, | |
1016 | unsigned short family) | |
1017 | { | |
1018 | struct xfrm_state *x; | |
1da177e4 LT |
1019 | |
1020 | spin_lock_bh(&xfrm_state_lock); | |
edcd5821 | 1021 | x = __xfrm_state_lookup(daddr, spi, proto, family); |
1da177e4 | 1022 | spin_unlock_bh(&xfrm_state_lock); |
1da177e4 LT |
1023 | return x; |
1024 | } | |
1025 | EXPORT_SYMBOL(xfrm_state_lookup); | |
1026 | ||
1027 | struct xfrm_state * | |
eb2971b6 MN |
1028 | xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, |
1029 | u8 proto, unsigned short family) | |
1030 | { | |
1031 | struct xfrm_state *x; | |
eb2971b6 MN |
1032 | |
1033 | spin_lock_bh(&xfrm_state_lock); | |
edcd5821 | 1034 | x = __xfrm_state_lookup_byaddr(daddr, saddr, proto, family); |
eb2971b6 | 1035 | spin_unlock_bh(&xfrm_state_lock); |
eb2971b6 MN |
1036 | return x; |
1037 | } | |
1038 | EXPORT_SYMBOL(xfrm_state_lookup_byaddr); | |
1039 | ||
1040 | struct xfrm_state * | |
1da177e4 LT |
1041 | xfrm_find_acq(u8 mode, u32 reqid, u8 proto, |
1042 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
1043 | int create, unsigned short family) | |
1044 | { | |
1045 | struct xfrm_state *x; | |
1da177e4 LT |
1046 | |
1047 | spin_lock_bh(&xfrm_state_lock); | |
2770834c | 1048 | x = __find_acq_core(family, mode, reqid, proto, daddr, saddr, create); |
1da177e4 | 1049 | spin_unlock_bh(&xfrm_state_lock); |
2770834c | 1050 | |
1da177e4 LT |
1051 | return x; |
1052 | } | |
1053 | EXPORT_SYMBOL(xfrm_find_acq); | |
1054 | ||
41a49cc3 MN |
1055 | #ifdef CONFIG_XFRM_SUB_POLICY |
1056 | int | |
1057 | xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, | |
1058 | unsigned short family) | |
1059 | { | |
1060 | int err = 0; | |
1061 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
1062 | if (!afinfo) | |
1063 | return -EAFNOSUPPORT; | |
1064 | ||
1065 | spin_lock_bh(&xfrm_state_lock); | |
1066 | if (afinfo->tmpl_sort) | |
1067 | err = afinfo->tmpl_sort(dst, src, n); | |
1068 | spin_unlock_bh(&xfrm_state_lock); | |
1069 | xfrm_state_put_afinfo(afinfo); | |
1070 | return err; | |
1071 | } | |
1072 | EXPORT_SYMBOL(xfrm_tmpl_sort); | |
1073 | ||
1074 | int | |
1075 | xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, | |
1076 | unsigned short family) | |
1077 | { | |
1078 | int err = 0; | |
1079 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
1080 | if (!afinfo) | |
1081 | return -EAFNOSUPPORT; | |
1082 | ||
1083 | spin_lock_bh(&xfrm_state_lock); | |
1084 | if (afinfo->state_sort) | |
1085 | err = afinfo->state_sort(dst, src, n); | |
1086 | spin_unlock_bh(&xfrm_state_lock); | |
1087 | xfrm_state_put_afinfo(afinfo); | |
1088 | return err; | |
1089 | } | |
1090 | EXPORT_SYMBOL(xfrm_state_sort); | |
1091 | #endif | |
1092 | ||
1da177e4 LT |
1093 | /* Silly enough, but I'm lazy to build resolution list */ |
1094 | ||
1095 | static struct xfrm_state *__xfrm_find_acq_byseq(u32 seq) | |
1096 | { | |
1097 | int i; | |
1da177e4 | 1098 | |
f034b5d4 | 1099 | for (i = 0; i <= xfrm_state_hmask; i++) { |
8f126e37 DM |
1100 | struct hlist_node *entry; |
1101 | struct xfrm_state *x; | |
1102 | ||
1103 | hlist_for_each_entry(x, entry, xfrm_state_bydst+i, bydst) { | |
1104 | if (x->km.seq == seq && | |
1105 | x->km.state == XFRM_STATE_ACQ) { | |
1da177e4 LT |
1106 | xfrm_state_hold(x); |
1107 | return x; | |
1108 | } | |
1109 | } | |
1110 | } | |
1111 | return NULL; | |
1112 | } | |
1113 | ||
1114 | struct xfrm_state *xfrm_find_acq_byseq(u32 seq) | |
1115 | { | |
1116 | struct xfrm_state *x; | |
1117 | ||
1118 | spin_lock_bh(&xfrm_state_lock); | |
1119 | x = __xfrm_find_acq_byseq(seq); | |
1120 | spin_unlock_bh(&xfrm_state_lock); | |
1121 | return x; | |
1122 | } | |
1123 | EXPORT_SYMBOL(xfrm_find_acq_byseq); | |
1124 | ||
1125 | u32 xfrm_get_acqseq(void) | |
1126 | { | |
1127 | u32 res; | |
1128 | static u32 acqseq; | |
1129 | static DEFINE_SPINLOCK(acqseq_lock); | |
1130 | ||
1131 | spin_lock_bh(&acqseq_lock); | |
1132 | res = (++acqseq ? : ++acqseq); | |
1133 | spin_unlock_bh(&acqseq_lock); | |
1134 | return res; | |
1135 | } | |
1136 | EXPORT_SYMBOL(xfrm_get_acqseq); | |
1137 | ||
1138 | void | |
1139 | xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi) | |
1140 | { | |
f034b5d4 | 1141 | unsigned int h; |
1da177e4 LT |
1142 | struct xfrm_state *x0; |
1143 | ||
1144 | if (x->id.spi) | |
1145 | return; | |
1146 | ||
1147 | if (minspi == maxspi) { | |
1148 | x0 = xfrm_state_lookup(&x->id.daddr, minspi, x->id.proto, x->props.family); | |
1149 | if (x0) { | |
1150 | xfrm_state_put(x0); | |
1151 | return; | |
1152 | } | |
1153 | x->id.spi = minspi; | |
1154 | } else { | |
1155 | u32 spi = 0; | |
1156 | minspi = ntohl(minspi); | |
1157 | maxspi = ntohl(maxspi); | |
1158 | for (h=0; h<maxspi-minspi+1; h++) { | |
1159 | spi = minspi + net_random()%(maxspi-minspi+1); | |
1160 | x0 = xfrm_state_lookup(&x->id.daddr, htonl(spi), x->id.proto, x->props.family); | |
1161 | if (x0 == NULL) { | |
1162 | x->id.spi = htonl(spi); | |
1163 | break; | |
1164 | } | |
1165 | xfrm_state_put(x0); | |
1166 | } | |
1167 | } | |
1168 | if (x->id.spi) { | |
1169 | spin_lock_bh(&xfrm_state_lock); | |
1170 | h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, x->props.family); | |
8f126e37 | 1171 | hlist_add_head(&x->byspi, xfrm_state_byspi+h); |
1da177e4 LT |
1172 | spin_unlock_bh(&xfrm_state_lock); |
1173 | wake_up(&km_waitq); | |
1174 | } | |
1175 | } | |
1176 | EXPORT_SYMBOL(xfrm_alloc_spi); | |
1177 | ||
1178 | int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), | |
1179 | void *data) | |
1180 | { | |
1181 | int i; | |
1182 | struct xfrm_state *x; | |
8f126e37 | 1183 | struct hlist_node *entry; |
1da177e4 LT |
1184 | int count = 0; |
1185 | int err = 0; | |
1186 | ||
1187 | spin_lock_bh(&xfrm_state_lock); | |
f034b5d4 | 1188 | for (i = 0; i <= xfrm_state_hmask; i++) { |
8f126e37 | 1189 | hlist_for_each_entry(x, entry, xfrm_state_bydst+i, bydst) { |
5794708f | 1190 | if (xfrm_id_proto_match(x->id.proto, proto)) |
1da177e4 LT |
1191 | count++; |
1192 | } | |
1193 | } | |
1194 | if (count == 0) { | |
1195 | err = -ENOENT; | |
1196 | goto out; | |
1197 | } | |
1198 | ||
f034b5d4 | 1199 | for (i = 0; i <= xfrm_state_hmask; i++) { |
8f126e37 | 1200 | hlist_for_each_entry(x, entry, xfrm_state_bydst+i, bydst) { |
5794708f | 1201 | if (!xfrm_id_proto_match(x->id.proto, proto)) |
1da177e4 LT |
1202 | continue; |
1203 | err = func(x, --count, data); | |
1204 | if (err) | |
1205 | goto out; | |
1206 | } | |
1207 | } | |
1208 | out: | |
1209 | spin_unlock_bh(&xfrm_state_lock); | |
1210 | return err; | |
1211 | } | |
1212 | EXPORT_SYMBOL(xfrm_state_walk); | |
1213 | ||
f8cd5488 JHS |
1214 | |
1215 | void xfrm_replay_notify(struct xfrm_state *x, int event) | |
1216 | { | |
1217 | struct km_event c; | |
1218 | /* we send notify messages in case | |
1219 | * 1. we updated on of the sequence numbers, and the seqno difference | |
1220 | * is at least x->replay_maxdiff, in this case we also update the | |
1221 | * timeout of our timer function | |
1222 | * 2. if x->replay_maxage has elapsed since last update, | |
1223 | * and there were changes | |
1224 | * | |
1225 | * The state structure must be locked! | |
1226 | */ | |
1227 | ||
1228 | switch (event) { | |
1229 | case XFRM_REPLAY_UPDATE: | |
1230 | if (x->replay_maxdiff && | |
1231 | (x->replay.seq - x->preplay.seq < x->replay_maxdiff) && | |
2717096a JHS |
1232 | (x->replay.oseq - x->preplay.oseq < x->replay_maxdiff)) { |
1233 | if (x->xflags & XFRM_TIME_DEFER) | |
1234 | event = XFRM_REPLAY_TIMEOUT; | |
1235 | else | |
1236 | return; | |
1237 | } | |
f8cd5488 JHS |
1238 | |
1239 | break; | |
1240 | ||
1241 | case XFRM_REPLAY_TIMEOUT: | |
1242 | if ((x->replay.seq == x->preplay.seq) && | |
1243 | (x->replay.bitmap == x->preplay.bitmap) && | |
2717096a JHS |
1244 | (x->replay.oseq == x->preplay.oseq)) { |
1245 | x->xflags |= XFRM_TIME_DEFER; | |
f8cd5488 | 1246 | return; |
2717096a | 1247 | } |
f8cd5488 JHS |
1248 | |
1249 | break; | |
1250 | } | |
1251 | ||
1252 | memcpy(&x->preplay, &x->replay, sizeof(struct xfrm_replay_state)); | |
1253 | c.event = XFRM_MSG_NEWAE; | |
1254 | c.data.aevent = event; | |
1255 | km_state_notify(x, &c); | |
1256 | ||
f8cd5488 | 1257 | if (x->replay_maxage && |
a47f0ce0 | 1258 | !mod_timer(&x->rtimer, jiffies + x->replay_maxage)) |
2717096a | 1259 | x->xflags &= ~XFRM_TIME_DEFER; |
f8cd5488 | 1260 | } |
a70fcb0b | 1261 | EXPORT_SYMBOL(xfrm_replay_notify); |
f8cd5488 JHS |
1262 | |
1263 | static void xfrm_replay_timer_handler(unsigned long data) | |
1264 | { | |
1265 | struct xfrm_state *x = (struct xfrm_state*)data; | |
1266 | ||
1267 | spin_lock(&x->lock); | |
1268 | ||
2717096a JHS |
1269 | if (x->km.state == XFRM_STATE_VALID) { |
1270 | if (xfrm_aevent_is_on()) | |
1271 | xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT); | |
1272 | else | |
1273 | x->xflags |= XFRM_TIME_DEFER; | |
1274 | } | |
f8cd5488 JHS |
1275 | |
1276 | spin_unlock(&x->lock); | |
1277 | } | |
1278 | ||
1da177e4 LT |
1279 | int xfrm_replay_check(struct xfrm_state *x, u32 seq) |
1280 | { | |
1281 | u32 diff; | |
1282 | ||
1283 | seq = ntohl(seq); | |
1284 | ||
1285 | if (unlikely(seq == 0)) | |
1286 | return -EINVAL; | |
1287 | ||
1288 | if (likely(seq > x->replay.seq)) | |
1289 | return 0; | |
1290 | ||
1291 | diff = x->replay.seq - seq; | |
1292 | if (diff >= x->props.replay_window) { | |
1293 | x->stats.replay_window++; | |
1294 | return -EINVAL; | |
1295 | } | |
1296 | ||
1297 | if (x->replay.bitmap & (1U << diff)) { | |
1298 | x->stats.replay++; | |
1299 | return -EINVAL; | |
1300 | } | |
1301 | return 0; | |
1302 | } | |
1303 | EXPORT_SYMBOL(xfrm_replay_check); | |
1304 | ||
1305 | void xfrm_replay_advance(struct xfrm_state *x, u32 seq) | |
1306 | { | |
1307 | u32 diff; | |
1308 | ||
1309 | seq = ntohl(seq); | |
1310 | ||
1311 | if (seq > x->replay.seq) { | |
1312 | diff = seq - x->replay.seq; | |
1313 | if (diff < x->props.replay_window) | |
1314 | x->replay.bitmap = ((x->replay.bitmap) << diff) | 1; | |
1315 | else | |
1316 | x->replay.bitmap = 1; | |
1317 | x->replay.seq = seq; | |
1318 | } else { | |
1319 | diff = x->replay.seq - seq; | |
1320 | x->replay.bitmap |= (1U << diff); | |
1321 | } | |
f8cd5488 JHS |
1322 | |
1323 | if (xfrm_aevent_is_on()) | |
1324 | xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); | |
1da177e4 LT |
1325 | } |
1326 | EXPORT_SYMBOL(xfrm_replay_advance); | |
1327 | ||
1328 | static struct list_head xfrm_km_list = LIST_HEAD_INIT(xfrm_km_list); | |
1329 | static DEFINE_RWLOCK(xfrm_km_lock); | |
1330 | ||
26b15dad | 1331 | void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) |
1da177e4 LT |
1332 | { |
1333 | struct xfrm_mgr *km; | |
1334 | ||
26b15dad JHS |
1335 | read_lock(&xfrm_km_lock); |
1336 | list_for_each_entry(km, &xfrm_km_list, list) | |
1337 | if (km->notify_policy) | |
1338 | km->notify_policy(xp, dir, c); | |
1339 | read_unlock(&xfrm_km_lock); | |
1340 | } | |
1da177e4 | 1341 | |
26b15dad JHS |
1342 | void km_state_notify(struct xfrm_state *x, struct km_event *c) |
1343 | { | |
1344 | struct xfrm_mgr *km; | |
1da177e4 LT |
1345 | read_lock(&xfrm_km_lock); |
1346 | list_for_each_entry(km, &xfrm_km_list, list) | |
26b15dad JHS |
1347 | if (km->notify) |
1348 | km->notify(x, c); | |
1da177e4 | 1349 | read_unlock(&xfrm_km_lock); |
26b15dad JHS |
1350 | } |
1351 | ||
1352 | EXPORT_SYMBOL(km_policy_notify); | |
1353 | EXPORT_SYMBOL(km_state_notify); | |
1354 | ||
53bc6b4d | 1355 | void km_state_expired(struct xfrm_state *x, int hard, u32 pid) |
26b15dad JHS |
1356 | { |
1357 | struct km_event c; | |
1358 | ||
bf08867f | 1359 | c.data.hard = hard; |
53bc6b4d | 1360 | c.pid = pid; |
f60f6b8f | 1361 | c.event = XFRM_MSG_EXPIRE; |
26b15dad | 1362 | km_state_notify(x, &c); |
1da177e4 LT |
1363 | |
1364 | if (hard) | |
1365 | wake_up(&km_waitq); | |
1366 | } | |
1367 | ||
53bc6b4d | 1368 | EXPORT_SYMBOL(km_state_expired); |
26b15dad JHS |
1369 | /* |
1370 | * We send to all registered managers regardless of failure | |
1371 | * We are happy with one success | |
1372 | */ | |
980ebd25 | 1373 | int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol) |
1da177e4 | 1374 | { |
26b15dad | 1375 | int err = -EINVAL, acqret; |
1da177e4 LT |
1376 | struct xfrm_mgr *km; |
1377 | ||
1378 | read_lock(&xfrm_km_lock); | |
1379 | list_for_each_entry(km, &xfrm_km_list, list) { | |
26b15dad JHS |
1380 | acqret = km->acquire(x, t, pol, XFRM_POLICY_OUT); |
1381 | if (!acqret) | |
1382 | err = acqret; | |
1da177e4 LT |
1383 | } |
1384 | read_unlock(&xfrm_km_lock); | |
1385 | return err; | |
1386 | } | |
980ebd25 | 1387 | EXPORT_SYMBOL(km_query); |
1da177e4 LT |
1388 | |
1389 | int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport) | |
1390 | { | |
1391 | int err = -EINVAL; | |
1392 | struct xfrm_mgr *km; | |
1393 | ||
1394 | read_lock(&xfrm_km_lock); | |
1395 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1396 | if (km->new_mapping) | |
1397 | err = km->new_mapping(x, ipaddr, sport); | |
1398 | if (!err) | |
1399 | break; | |
1400 | } | |
1401 | read_unlock(&xfrm_km_lock); | |
1402 | return err; | |
1403 | } | |
1404 | EXPORT_SYMBOL(km_new_mapping); | |
1405 | ||
6c5c8ca7 | 1406 | void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid) |
1da177e4 | 1407 | { |
26b15dad | 1408 | struct km_event c; |
1da177e4 | 1409 | |
bf08867f | 1410 | c.data.hard = hard; |
6c5c8ca7 | 1411 | c.pid = pid; |
f60f6b8f | 1412 | c.event = XFRM_MSG_POLEXPIRE; |
26b15dad | 1413 | km_policy_notify(pol, dir, &c); |
1da177e4 LT |
1414 | |
1415 | if (hard) | |
1416 | wake_up(&km_waitq); | |
1417 | } | |
a70fcb0b | 1418 | EXPORT_SYMBOL(km_policy_expired); |
1da177e4 | 1419 | |
97a64b45 MN |
1420 | int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr) |
1421 | { | |
1422 | int err = -EINVAL; | |
1423 | int ret; | |
1424 | struct xfrm_mgr *km; | |
1425 | ||
1426 | read_lock(&xfrm_km_lock); | |
1427 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1428 | if (km->report) { | |
1429 | ret = km->report(proto, sel, addr); | |
1430 | if (!ret) | |
1431 | err = ret; | |
1432 | } | |
1433 | } | |
1434 | read_unlock(&xfrm_km_lock); | |
1435 | return err; | |
1436 | } | |
1437 | EXPORT_SYMBOL(km_report); | |
1438 | ||
1da177e4 LT |
1439 | int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) |
1440 | { | |
1441 | int err; | |
1442 | u8 *data; | |
1443 | struct xfrm_mgr *km; | |
1444 | struct xfrm_policy *pol = NULL; | |
1445 | ||
1446 | if (optlen <= 0 || optlen > PAGE_SIZE) | |
1447 | return -EMSGSIZE; | |
1448 | ||
1449 | data = kmalloc(optlen, GFP_KERNEL); | |
1450 | if (!data) | |
1451 | return -ENOMEM; | |
1452 | ||
1453 | err = -EFAULT; | |
1454 | if (copy_from_user(data, optval, optlen)) | |
1455 | goto out; | |
1456 | ||
1457 | err = -EINVAL; | |
1458 | read_lock(&xfrm_km_lock); | |
1459 | list_for_each_entry(km, &xfrm_km_list, list) { | |
cb969f07 | 1460 | pol = km->compile_policy(sk, optname, data, |
1da177e4 LT |
1461 | optlen, &err); |
1462 | if (err >= 0) | |
1463 | break; | |
1464 | } | |
1465 | read_unlock(&xfrm_km_lock); | |
1466 | ||
1467 | if (err >= 0) { | |
1468 | xfrm_sk_policy_insert(sk, err, pol); | |
1469 | xfrm_pol_put(pol); | |
1470 | err = 0; | |
1471 | } | |
1472 | ||
1473 | out: | |
1474 | kfree(data); | |
1475 | return err; | |
1476 | } | |
1477 | EXPORT_SYMBOL(xfrm_user_policy); | |
1478 | ||
1479 | int xfrm_register_km(struct xfrm_mgr *km) | |
1480 | { | |
1481 | write_lock_bh(&xfrm_km_lock); | |
1482 | list_add_tail(&km->list, &xfrm_km_list); | |
1483 | write_unlock_bh(&xfrm_km_lock); | |
1484 | return 0; | |
1485 | } | |
1486 | EXPORT_SYMBOL(xfrm_register_km); | |
1487 | ||
1488 | int xfrm_unregister_km(struct xfrm_mgr *km) | |
1489 | { | |
1490 | write_lock_bh(&xfrm_km_lock); | |
1491 | list_del(&km->list); | |
1492 | write_unlock_bh(&xfrm_km_lock); | |
1493 | return 0; | |
1494 | } | |
1495 | EXPORT_SYMBOL(xfrm_unregister_km); | |
1496 | ||
1497 | int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo) | |
1498 | { | |
1499 | int err = 0; | |
1500 | if (unlikely(afinfo == NULL)) | |
1501 | return -EINVAL; | |
1502 | if (unlikely(afinfo->family >= NPROTO)) | |
1503 | return -EAFNOSUPPORT; | |
f3111502 | 1504 | write_lock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1505 | if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL)) |
1506 | err = -ENOBUFS; | |
edcd5821 | 1507 | else |
1da177e4 | 1508 | xfrm_state_afinfo[afinfo->family] = afinfo; |
f3111502 | 1509 | write_unlock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1510 | return err; |
1511 | } | |
1512 | EXPORT_SYMBOL(xfrm_state_register_afinfo); | |
1513 | ||
1514 | int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo) | |
1515 | { | |
1516 | int err = 0; | |
1517 | if (unlikely(afinfo == NULL)) | |
1518 | return -EINVAL; | |
1519 | if (unlikely(afinfo->family >= NPROTO)) | |
1520 | return -EAFNOSUPPORT; | |
f3111502 | 1521 | write_lock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1522 | if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) { |
1523 | if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo)) | |
1524 | err = -EINVAL; | |
edcd5821 | 1525 | else |
1da177e4 | 1526 | xfrm_state_afinfo[afinfo->family] = NULL; |
1da177e4 | 1527 | } |
f3111502 | 1528 | write_unlock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1529 | return err; |
1530 | } | |
1531 | EXPORT_SYMBOL(xfrm_state_unregister_afinfo); | |
1532 | ||
1533 | static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family) | |
1534 | { | |
1535 | struct xfrm_state_afinfo *afinfo; | |
1536 | if (unlikely(family >= NPROTO)) | |
1537 | return NULL; | |
1538 | read_lock(&xfrm_state_afinfo_lock); | |
1539 | afinfo = xfrm_state_afinfo[family]; | |
546be240 HX |
1540 | if (unlikely(!afinfo)) |
1541 | read_unlock(&xfrm_state_afinfo_lock); | |
1da177e4 LT |
1542 | return afinfo; |
1543 | } | |
1544 | ||
1545 | static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo) | |
1546 | { | |
546be240 | 1547 | read_unlock(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1548 | } |
1549 | ||
1550 | /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */ | |
1551 | void xfrm_state_delete_tunnel(struct xfrm_state *x) | |
1552 | { | |
1553 | if (x->tunnel) { | |
1554 | struct xfrm_state *t = x->tunnel; | |
1555 | ||
1556 | if (atomic_read(&t->tunnel_users) == 2) | |
1557 | xfrm_state_delete(t); | |
1558 | atomic_dec(&t->tunnel_users); | |
1559 | xfrm_state_put(t); | |
1560 | x->tunnel = NULL; | |
1561 | } | |
1562 | } | |
1563 | EXPORT_SYMBOL(xfrm_state_delete_tunnel); | |
1564 | ||
80b30c10 HX |
1565 | /* |
1566 | * This function is NOT optimal. For example, with ESP it will give an | |
1567 | * MTU that's usually two bytes short of being optimal. However, it will | |
1568 | * usually give an answer that's a multiple of 4 provided the input is | |
1569 | * also a multiple of 4. | |
1570 | */ | |
1da177e4 LT |
1571 | int xfrm_state_mtu(struct xfrm_state *x, int mtu) |
1572 | { | |
1573 | int res = mtu; | |
1574 | ||
1575 | res -= x->props.header_len; | |
1576 | ||
1577 | for (;;) { | |
1578 | int m = res; | |
1579 | ||
1580 | if (m < 68) | |
1581 | return 68; | |
1582 | ||
1583 | spin_lock_bh(&x->lock); | |
1584 | if (x->km.state == XFRM_STATE_VALID && | |
1585 | x->type && x->type->get_max_size) | |
1586 | m = x->type->get_max_size(x, m); | |
1587 | else | |
1588 | m += x->props.header_len; | |
1589 | spin_unlock_bh(&x->lock); | |
1590 | ||
1591 | if (m <= mtu) | |
1592 | break; | |
1593 | res -= (m - mtu); | |
1594 | } | |
1595 | ||
1596 | return res; | |
1597 | } | |
1598 | ||
72cb6962 HX |
1599 | int xfrm_init_state(struct xfrm_state *x) |
1600 | { | |
d094cd83 HX |
1601 | struct xfrm_state_afinfo *afinfo; |
1602 | int family = x->props.family; | |
72cb6962 HX |
1603 | int err; |
1604 | ||
d094cd83 HX |
1605 | err = -EAFNOSUPPORT; |
1606 | afinfo = xfrm_state_get_afinfo(family); | |
1607 | if (!afinfo) | |
1608 | goto error; | |
1609 | ||
1610 | err = 0; | |
1611 | if (afinfo->init_flags) | |
1612 | err = afinfo->init_flags(x); | |
1613 | ||
1614 | xfrm_state_put_afinfo(afinfo); | |
1615 | ||
1616 | if (err) | |
1617 | goto error; | |
1618 | ||
1619 | err = -EPROTONOSUPPORT; | |
1620 | x->type = xfrm_get_type(x->id.proto, family); | |
72cb6962 HX |
1621 | if (x->type == NULL) |
1622 | goto error; | |
1623 | ||
1624 | err = x->type->init_state(x); | |
1625 | if (err) | |
1626 | goto error; | |
1627 | ||
b59f45d0 HX |
1628 | x->mode = xfrm_get_mode(x->props.mode, family); |
1629 | if (x->mode == NULL) | |
1630 | goto error; | |
1631 | ||
72cb6962 HX |
1632 | x->km.state = XFRM_STATE_VALID; |
1633 | ||
1634 | error: | |
1635 | return err; | |
1636 | } | |
1637 | ||
1638 | EXPORT_SYMBOL(xfrm_init_state); | |
1da177e4 LT |
1639 | |
1640 | void __init xfrm_state_init(void) | |
1641 | { | |
f034b5d4 DM |
1642 | unsigned int sz; |
1643 | ||
1644 | sz = sizeof(struct hlist_head) * 8; | |
1645 | ||
1646 | xfrm_state_bydst = xfrm_state_hash_alloc(sz); | |
1647 | xfrm_state_bysrc = xfrm_state_hash_alloc(sz); | |
1648 | xfrm_state_byspi = xfrm_state_hash_alloc(sz); | |
1649 | if (!xfrm_state_bydst || !xfrm_state_bysrc || !xfrm_state_byspi) | |
1650 | panic("XFRM: Cannot allocate bydst/bysrc/byspi hashes."); | |
1651 | xfrm_state_hmask = ((sz / sizeof(struct hlist_head)) - 1); | |
1da177e4 | 1652 | |
1da177e4 LT |
1653 | INIT_WORK(&xfrm_state_gc_work, xfrm_state_gc_task, NULL); |
1654 | } | |
1655 |