Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * xfrm_state.c | |
3 | * | |
4 | * Changes: | |
5 | * Mitsuru KANDA @USAGI | |
6 | * Kazunori MIYAZAWA @USAGI | |
7 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> | |
8 | * IPv6 support | |
9 | * YOSHIFUJI Hideaki @USAGI | |
10 | * Split up af-specific functions | |
11 | * Derek Atkins <derek@ihtfp.com> | |
12 | * Add UDP Encapsulation | |
df71837d | 13 | * |
1da177e4 LT |
14 | */ |
15 | ||
16 | #include <linux/workqueue.h> | |
17 | #include <net/xfrm.h> | |
18 | #include <linux/pfkeyv2.h> | |
19 | #include <linux/ipsec.h> | |
20 | #include <linux/module.h> | |
f034b5d4 | 21 | #include <linux/cache.h> |
1da177e4 | 22 | #include <asm/uaccess.h> |
161a09e7 | 23 | #include <linux/audit.h> |
1da177e4 | 24 | |
44e36b42 DM |
25 | #include "xfrm_hash.h" |
26 | ||
ee857a7d DM |
27 | struct sock *xfrm_nl; |
28 | EXPORT_SYMBOL(xfrm_nl); | |
29 | ||
f8cd5488 | 30 | u32 sysctl_xfrm_aevent_etime = XFRM_AE_ETIME; |
a70fcb0b DM |
31 | EXPORT_SYMBOL(sysctl_xfrm_aevent_etime); |
32 | ||
f8cd5488 | 33 | u32 sysctl_xfrm_aevent_rseqth = XFRM_AE_SEQT_SIZE; |
a70fcb0b DM |
34 | EXPORT_SYMBOL(sysctl_xfrm_aevent_rseqth); |
35 | ||
1da177e4 LT |
36 | /* Each xfrm_state may be linked to two tables: |
37 | ||
38 | 1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl) | |
a624c108 | 39 | 2. Hash table by (daddr,family,reqid) to find what SAs exist for given |
1da177e4 LT |
40 | destination/tunnel endpoint. (output) |
41 | */ | |
42 | ||
43 | static DEFINE_SPINLOCK(xfrm_state_lock); | |
44 | ||
45 | /* Hash table to find appropriate SA towards given target (endpoint | |
46 | * of tunnel or destination of transport mode) allowed by selector. | |
47 | * | |
48 | * Main use is finding SA after policy selected tunnel or transport mode. | |
49 | * Also, it can be used by ah/esp icmp error handler to find offending SA. | |
50 | */ | |
f034b5d4 DM |
51 | static struct hlist_head *xfrm_state_bydst __read_mostly; |
52 | static struct hlist_head *xfrm_state_bysrc __read_mostly; | |
53 | static struct hlist_head *xfrm_state_byspi __read_mostly; | |
54 | static unsigned int xfrm_state_hmask __read_mostly; | |
55 | static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024; | |
56 | static unsigned int xfrm_state_num; | |
9d4a706d | 57 | static unsigned int xfrm_state_genid; |
f034b5d4 | 58 | |
c1969f29 DM |
59 | static inline unsigned int xfrm_dst_hash(xfrm_address_t *daddr, |
60 | xfrm_address_t *saddr, | |
61 | u32 reqid, | |
a624c108 | 62 | unsigned short family) |
f034b5d4 | 63 | { |
c1969f29 | 64 | return __xfrm_dst_hash(daddr, saddr, reqid, family, xfrm_state_hmask); |
f034b5d4 DM |
65 | } |
66 | ||
667bbcb6 MN |
67 | static inline unsigned int xfrm_src_hash(xfrm_address_t *daddr, |
68 | xfrm_address_t *saddr, | |
44e36b42 | 69 | unsigned short family) |
f034b5d4 | 70 | { |
667bbcb6 | 71 | return __xfrm_src_hash(daddr, saddr, family, xfrm_state_hmask); |
f034b5d4 DM |
72 | } |
73 | ||
f034b5d4 | 74 | static inline unsigned int |
8122adf0 | 75 | xfrm_spi_hash(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family) |
f034b5d4 | 76 | { |
c1969f29 | 77 | return __xfrm_spi_hash(daddr, spi, proto, family, xfrm_state_hmask); |
f034b5d4 DM |
78 | } |
79 | ||
f034b5d4 DM |
80 | static void xfrm_hash_transfer(struct hlist_head *list, |
81 | struct hlist_head *ndsttable, | |
82 | struct hlist_head *nsrctable, | |
83 | struct hlist_head *nspitable, | |
84 | unsigned int nhashmask) | |
85 | { | |
86 | struct hlist_node *entry, *tmp; | |
87 | struct xfrm_state *x; | |
88 | ||
89 | hlist_for_each_entry_safe(x, entry, tmp, list, bydst) { | |
90 | unsigned int h; | |
91 | ||
c1969f29 DM |
92 | h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr, |
93 | x->props.reqid, x->props.family, | |
94 | nhashmask); | |
f034b5d4 DM |
95 | hlist_add_head(&x->bydst, ndsttable+h); |
96 | ||
667bbcb6 MN |
97 | h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr, |
98 | x->props.family, | |
f034b5d4 DM |
99 | nhashmask); |
100 | hlist_add_head(&x->bysrc, nsrctable+h); | |
101 | ||
7b4dc360 MN |
102 | if (x->id.spi) { |
103 | h = __xfrm_spi_hash(&x->id.daddr, x->id.spi, | |
104 | x->id.proto, x->props.family, | |
105 | nhashmask); | |
106 | hlist_add_head(&x->byspi, nspitable+h); | |
107 | } | |
f034b5d4 DM |
108 | } |
109 | } | |
110 | ||
111 | static unsigned long xfrm_hash_new_size(void) | |
112 | { | |
113 | return ((xfrm_state_hmask + 1) << 1) * | |
114 | sizeof(struct hlist_head); | |
115 | } | |
116 | ||
117 | static DEFINE_MUTEX(hash_resize_mutex); | |
118 | ||
c4028958 | 119 | static void xfrm_hash_resize(struct work_struct *__unused) |
f034b5d4 DM |
120 | { |
121 | struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi; | |
122 | unsigned long nsize, osize; | |
123 | unsigned int nhashmask, ohashmask; | |
124 | int i; | |
125 | ||
126 | mutex_lock(&hash_resize_mutex); | |
127 | ||
128 | nsize = xfrm_hash_new_size(); | |
44e36b42 | 129 | ndst = xfrm_hash_alloc(nsize); |
f034b5d4 DM |
130 | if (!ndst) |
131 | goto out_unlock; | |
44e36b42 | 132 | nsrc = xfrm_hash_alloc(nsize); |
f034b5d4 | 133 | if (!nsrc) { |
44e36b42 | 134 | xfrm_hash_free(ndst, nsize); |
f034b5d4 DM |
135 | goto out_unlock; |
136 | } | |
44e36b42 | 137 | nspi = xfrm_hash_alloc(nsize); |
f034b5d4 | 138 | if (!nspi) { |
44e36b42 DM |
139 | xfrm_hash_free(ndst, nsize); |
140 | xfrm_hash_free(nsrc, nsize); | |
f034b5d4 DM |
141 | goto out_unlock; |
142 | } | |
143 | ||
144 | spin_lock_bh(&xfrm_state_lock); | |
145 | ||
146 | nhashmask = (nsize / sizeof(struct hlist_head)) - 1U; | |
147 | for (i = xfrm_state_hmask; i >= 0; i--) | |
148 | xfrm_hash_transfer(xfrm_state_bydst+i, ndst, nsrc, nspi, | |
149 | nhashmask); | |
150 | ||
151 | odst = xfrm_state_bydst; | |
152 | osrc = xfrm_state_bysrc; | |
153 | ospi = xfrm_state_byspi; | |
154 | ohashmask = xfrm_state_hmask; | |
155 | ||
156 | xfrm_state_bydst = ndst; | |
157 | xfrm_state_bysrc = nsrc; | |
158 | xfrm_state_byspi = nspi; | |
159 | xfrm_state_hmask = nhashmask; | |
160 | ||
161 | spin_unlock_bh(&xfrm_state_lock); | |
162 | ||
163 | osize = (ohashmask + 1) * sizeof(struct hlist_head); | |
44e36b42 DM |
164 | xfrm_hash_free(odst, osize); |
165 | xfrm_hash_free(osrc, osize); | |
166 | xfrm_hash_free(ospi, osize); | |
f034b5d4 DM |
167 | |
168 | out_unlock: | |
169 | mutex_unlock(&hash_resize_mutex); | |
170 | } | |
171 | ||
c4028958 | 172 | static DECLARE_WORK(xfrm_hash_work, xfrm_hash_resize); |
f034b5d4 | 173 | |
1da177e4 LT |
174 | DECLARE_WAIT_QUEUE_HEAD(km_waitq); |
175 | EXPORT_SYMBOL(km_waitq); | |
176 | ||
177 | static DEFINE_RWLOCK(xfrm_state_afinfo_lock); | |
178 | static struct xfrm_state_afinfo *xfrm_state_afinfo[NPROTO]; | |
179 | ||
180 | static struct work_struct xfrm_state_gc_work; | |
8f126e37 | 181 | static HLIST_HEAD(xfrm_state_gc_list); |
1da177e4 LT |
182 | static DEFINE_SPINLOCK(xfrm_state_gc_lock); |
183 | ||
53bc6b4d | 184 | int __xfrm_state_delete(struct xfrm_state *x); |
1da177e4 | 185 | |
980ebd25 | 186 | int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); |
53bc6b4d | 187 | void km_state_expired(struct xfrm_state *x, int hard, u32 pid); |
1da177e4 LT |
188 | |
189 | static void xfrm_state_gc_destroy(struct xfrm_state *x) | |
190 | { | |
a47f0ce0 DM |
191 | del_timer_sync(&x->timer); |
192 | del_timer_sync(&x->rtimer); | |
a51482bd JJ |
193 | kfree(x->aalg); |
194 | kfree(x->ealg); | |
195 | kfree(x->calg); | |
196 | kfree(x->encap); | |
060f02a3 | 197 | kfree(x->coaddr); |
b59f45d0 HX |
198 | if (x->mode) |
199 | xfrm_put_mode(x->mode); | |
1da177e4 LT |
200 | if (x->type) { |
201 | x->type->destructor(x); | |
202 | xfrm_put_type(x->type); | |
203 | } | |
df71837d | 204 | security_xfrm_state_free(x); |
1da177e4 LT |
205 | kfree(x); |
206 | } | |
207 | ||
c4028958 | 208 | static void xfrm_state_gc_task(struct work_struct *data) |
1da177e4 LT |
209 | { |
210 | struct xfrm_state *x; | |
8f126e37 DM |
211 | struct hlist_node *entry, *tmp; |
212 | struct hlist_head gc_list; | |
1da177e4 | 213 | |
1da177e4 | 214 | spin_lock_bh(&xfrm_state_gc_lock); |
8f126e37 DM |
215 | gc_list.first = xfrm_state_gc_list.first; |
216 | INIT_HLIST_HEAD(&xfrm_state_gc_list); | |
1da177e4 LT |
217 | spin_unlock_bh(&xfrm_state_gc_lock); |
218 | ||
8f126e37 | 219 | hlist_for_each_entry_safe(x, entry, tmp, &gc_list, bydst) |
1da177e4 | 220 | xfrm_state_gc_destroy(x); |
8f126e37 | 221 | |
1da177e4 LT |
222 | wake_up(&km_waitq); |
223 | } | |
224 | ||
225 | static inline unsigned long make_jiffies(long secs) | |
226 | { | |
227 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
228 | return MAX_SCHEDULE_TIMEOUT-1; | |
229 | else | |
a716c119 | 230 | return secs*HZ; |
1da177e4 LT |
231 | } |
232 | ||
233 | static void xfrm_timer_handler(unsigned long data) | |
234 | { | |
235 | struct xfrm_state *x = (struct xfrm_state*)data; | |
236 | unsigned long now = (unsigned long)xtime.tv_sec; | |
237 | long next = LONG_MAX; | |
238 | int warn = 0; | |
161a09e7 | 239 | int err = 0; |
1da177e4 LT |
240 | |
241 | spin_lock(&x->lock); | |
242 | if (x->km.state == XFRM_STATE_DEAD) | |
243 | goto out; | |
244 | if (x->km.state == XFRM_STATE_EXPIRED) | |
245 | goto expired; | |
246 | if (x->lft.hard_add_expires_seconds) { | |
247 | long tmo = x->lft.hard_add_expires_seconds + | |
248 | x->curlft.add_time - now; | |
249 | if (tmo <= 0) | |
250 | goto expired; | |
251 | if (tmo < next) | |
252 | next = tmo; | |
253 | } | |
254 | if (x->lft.hard_use_expires_seconds) { | |
255 | long tmo = x->lft.hard_use_expires_seconds + | |
256 | (x->curlft.use_time ? : now) - now; | |
257 | if (tmo <= 0) | |
258 | goto expired; | |
259 | if (tmo < next) | |
260 | next = tmo; | |
261 | } | |
262 | if (x->km.dying) | |
263 | goto resched; | |
264 | if (x->lft.soft_add_expires_seconds) { | |
265 | long tmo = x->lft.soft_add_expires_seconds + | |
266 | x->curlft.add_time - now; | |
267 | if (tmo <= 0) | |
268 | warn = 1; | |
269 | else if (tmo < next) | |
270 | next = tmo; | |
271 | } | |
272 | if (x->lft.soft_use_expires_seconds) { | |
273 | long tmo = x->lft.soft_use_expires_seconds + | |
274 | (x->curlft.use_time ? : now) - now; | |
275 | if (tmo <= 0) | |
276 | warn = 1; | |
277 | else if (tmo < next) | |
278 | next = tmo; | |
279 | } | |
280 | ||
4666faab | 281 | x->km.dying = warn; |
1da177e4 | 282 | if (warn) |
53bc6b4d | 283 | km_state_expired(x, 0, 0); |
1da177e4 | 284 | resched: |
a47f0ce0 DM |
285 | if (next != LONG_MAX) |
286 | mod_timer(&x->timer, jiffies + make_jiffies(next)); | |
287 | ||
1da177e4 LT |
288 | goto out; |
289 | ||
290 | expired: | |
291 | if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) { | |
292 | x->km.state = XFRM_STATE_EXPIRED; | |
293 | wake_up(&km_waitq); | |
294 | next = 2; | |
295 | goto resched; | |
296 | } | |
161a09e7 JL |
297 | |
298 | err = __xfrm_state_delete(x); | |
299 | if (!err && x->id.spi) | |
53bc6b4d | 300 | km_state_expired(x, 1, 0); |
1da177e4 | 301 | |
161a09e7 JL |
302 | xfrm_audit_log(audit_get_loginuid(current->audit_context), 0, |
303 | AUDIT_MAC_IPSEC_DELSA, err ? 0 : 1, NULL, x); | |
304 | ||
1da177e4 LT |
305 | out: |
306 | spin_unlock(&x->lock); | |
1da177e4 LT |
307 | } |
308 | ||
0ac84752 DM |
309 | static void xfrm_replay_timer_handler(unsigned long data); |
310 | ||
1da177e4 LT |
311 | struct xfrm_state *xfrm_state_alloc(void) |
312 | { | |
313 | struct xfrm_state *x; | |
314 | ||
0da974f4 | 315 | x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC); |
1da177e4 LT |
316 | |
317 | if (x) { | |
1da177e4 LT |
318 | atomic_set(&x->refcnt, 1); |
319 | atomic_set(&x->tunnel_users, 0); | |
8f126e37 DM |
320 | INIT_HLIST_NODE(&x->bydst); |
321 | INIT_HLIST_NODE(&x->bysrc); | |
322 | INIT_HLIST_NODE(&x->byspi); | |
1da177e4 LT |
323 | init_timer(&x->timer); |
324 | x->timer.function = xfrm_timer_handler; | |
325 | x->timer.data = (unsigned long)x; | |
f8cd5488 JHS |
326 | init_timer(&x->rtimer); |
327 | x->rtimer.function = xfrm_replay_timer_handler; | |
328 | x->rtimer.data = (unsigned long)x; | |
1da177e4 LT |
329 | x->curlft.add_time = (unsigned long)xtime.tv_sec; |
330 | x->lft.soft_byte_limit = XFRM_INF; | |
331 | x->lft.soft_packet_limit = XFRM_INF; | |
332 | x->lft.hard_byte_limit = XFRM_INF; | |
333 | x->lft.hard_packet_limit = XFRM_INF; | |
f8cd5488 JHS |
334 | x->replay_maxage = 0; |
335 | x->replay_maxdiff = 0; | |
1da177e4 LT |
336 | spin_lock_init(&x->lock); |
337 | } | |
338 | return x; | |
339 | } | |
340 | EXPORT_SYMBOL(xfrm_state_alloc); | |
341 | ||
342 | void __xfrm_state_destroy(struct xfrm_state *x) | |
343 | { | |
344 | BUG_TRAP(x->km.state == XFRM_STATE_DEAD); | |
345 | ||
346 | spin_lock_bh(&xfrm_state_gc_lock); | |
8f126e37 | 347 | hlist_add_head(&x->bydst, &xfrm_state_gc_list); |
1da177e4 LT |
348 | spin_unlock_bh(&xfrm_state_gc_lock); |
349 | schedule_work(&xfrm_state_gc_work); | |
350 | } | |
351 | EXPORT_SYMBOL(__xfrm_state_destroy); | |
352 | ||
53bc6b4d | 353 | int __xfrm_state_delete(struct xfrm_state *x) |
1da177e4 | 354 | { |
26b15dad JHS |
355 | int err = -ESRCH; |
356 | ||
1da177e4 LT |
357 | if (x->km.state != XFRM_STATE_DEAD) { |
358 | x->km.state = XFRM_STATE_DEAD; | |
359 | spin_lock(&xfrm_state_lock); | |
8f126e37 | 360 | hlist_del(&x->bydst); |
8f126e37 | 361 | hlist_del(&x->bysrc); |
a47f0ce0 | 362 | if (x->id.spi) |
8f126e37 | 363 | hlist_del(&x->byspi); |
f034b5d4 | 364 | xfrm_state_num--; |
1da177e4 | 365 | spin_unlock(&xfrm_state_lock); |
1da177e4 | 366 | |
1da177e4 LT |
367 | /* All xfrm_state objects are created by xfrm_state_alloc. |
368 | * The xfrm_state_alloc call gives a reference, and that | |
369 | * is what we are dropping here. | |
370 | */ | |
21380b81 | 371 | __xfrm_state_put(x); |
26b15dad | 372 | err = 0; |
1da177e4 | 373 | } |
26b15dad JHS |
374 | |
375 | return err; | |
1da177e4 | 376 | } |
53bc6b4d | 377 | EXPORT_SYMBOL(__xfrm_state_delete); |
1da177e4 | 378 | |
26b15dad | 379 | int xfrm_state_delete(struct xfrm_state *x) |
1da177e4 | 380 | { |
26b15dad JHS |
381 | int err; |
382 | ||
1da177e4 | 383 | spin_lock_bh(&x->lock); |
26b15dad | 384 | err = __xfrm_state_delete(x); |
1da177e4 | 385 | spin_unlock_bh(&x->lock); |
26b15dad JHS |
386 | |
387 | return err; | |
1da177e4 LT |
388 | } |
389 | EXPORT_SYMBOL(xfrm_state_delete); | |
390 | ||
161a09e7 | 391 | void xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info) |
1da177e4 LT |
392 | { |
393 | int i; | |
161a09e7 | 394 | int err = 0; |
1da177e4 LT |
395 | |
396 | spin_lock_bh(&xfrm_state_lock); | |
a9917c06 | 397 | for (i = 0; i <= xfrm_state_hmask; i++) { |
8f126e37 DM |
398 | struct hlist_node *entry; |
399 | struct xfrm_state *x; | |
1da177e4 | 400 | restart: |
8f126e37 | 401 | hlist_for_each_entry(x, entry, xfrm_state_bydst+i, bydst) { |
1da177e4 | 402 | if (!xfrm_state_kern(x) && |
5794708f | 403 | xfrm_id_proto_match(x->id.proto, proto)) { |
1da177e4 LT |
404 | xfrm_state_hold(x); |
405 | spin_unlock_bh(&xfrm_state_lock); | |
406 | ||
161a09e7 JL |
407 | err = xfrm_state_delete(x); |
408 | xfrm_audit_log(audit_info->loginuid, | |
409 | audit_info->secid, | |
410 | AUDIT_MAC_IPSEC_DELSA, | |
411 | err ? 0 : 1, NULL, x); | |
1da177e4 LT |
412 | xfrm_state_put(x); |
413 | ||
414 | spin_lock_bh(&xfrm_state_lock); | |
415 | goto restart; | |
416 | } | |
417 | } | |
418 | } | |
419 | spin_unlock_bh(&xfrm_state_lock); | |
420 | wake_up(&km_waitq); | |
421 | } | |
422 | EXPORT_SYMBOL(xfrm_state_flush); | |
423 | ||
424 | static int | |
425 | xfrm_init_tempsel(struct xfrm_state *x, struct flowi *fl, | |
426 | struct xfrm_tmpl *tmpl, | |
427 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
428 | unsigned short family) | |
429 | { | |
430 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
431 | if (!afinfo) | |
432 | return -1; | |
433 | afinfo->init_tempsel(x, fl, tmpl, daddr, saddr); | |
434 | xfrm_state_put_afinfo(afinfo); | |
435 | return 0; | |
436 | } | |
437 | ||
a94cfd19 | 438 | static struct xfrm_state *__xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family) |
edcd5821 DM |
439 | { |
440 | unsigned int h = xfrm_spi_hash(daddr, spi, proto, family); | |
441 | struct xfrm_state *x; | |
8f126e37 | 442 | struct hlist_node *entry; |
edcd5821 | 443 | |
8f126e37 | 444 | hlist_for_each_entry(x, entry, xfrm_state_byspi+h, byspi) { |
edcd5821 DM |
445 | if (x->props.family != family || |
446 | x->id.spi != spi || | |
447 | x->id.proto != proto) | |
448 | continue; | |
449 | ||
450 | switch (family) { | |
451 | case AF_INET: | |
452 | if (x->id.daddr.a4 != daddr->a4) | |
453 | continue; | |
454 | break; | |
455 | case AF_INET6: | |
456 | if (!ipv6_addr_equal((struct in6_addr *)daddr, | |
457 | (struct in6_addr *) | |
458 | x->id.daddr.a6)) | |
459 | continue; | |
460 | break; | |
461 | }; | |
462 | ||
463 | xfrm_state_hold(x); | |
464 | return x; | |
465 | } | |
466 | ||
467 | return NULL; | |
468 | } | |
469 | ||
470 | static struct xfrm_state *__xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family) | |
471 | { | |
667bbcb6 | 472 | unsigned int h = xfrm_src_hash(daddr, saddr, family); |
edcd5821 | 473 | struct xfrm_state *x; |
8f126e37 | 474 | struct hlist_node *entry; |
edcd5821 | 475 | |
8f126e37 | 476 | hlist_for_each_entry(x, entry, xfrm_state_bysrc+h, bysrc) { |
edcd5821 DM |
477 | if (x->props.family != family || |
478 | x->id.proto != proto) | |
479 | continue; | |
480 | ||
481 | switch (family) { | |
482 | case AF_INET: | |
483 | if (x->id.daddr.a4 != daddr->a4 || | |
484 | x->props.saddr.a4 != saddr->a4) | |
485 | continue; | |
486 | break; | |
487 | case AF_INET6: | |
488 | if (!ipv6_addr_equal((struct in6_addr *)daddr, | |
489 | (struct in6_addr *) | |
490 | x->id.daddr.a6) || | |
491 | !ipv6_addr_equal((struct in6_addr *)saddr, | |
492 | (struct in6_addr *) | |
493 | x->props.saddr.a6)) | |
494 | continue; | |
495 | break; | |
496 | }; | |
497 | ||
498 | xfrm_state_hold(x); | |
499 | return x; | |
500 | } | |
501 | ||
502 | return NULL; | |
503 | } | |
504 | ||
505 | static inline struct xfrm_state * | |
506 | __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family) | |
507 | { | |
508 | if (use_spi) | |
509 | return __xfrm_state_lookup(&x->id.daddr, x->id.spi, | |
510 | x->id.proto, family); | |
511 | else | |
512 | return __xfrm_state_lookup_byaddr(&x->id.daddr, | |
513 | &x->props.saddr, | |
514 | x->id.proto, family); | |
515 | } | |
516 | ||
2fab22f2 PM |
517 | static void xfrm_hash_grow_check(int have_hash_collision) |
518 | { | |
519 | if (have_hash_collision && | |
520 | (xfrm_state_hmask + 1) < xfrm_state_hashmax && | |
521 | xfrm_state_num > xfrm_state_hmask) | |
522 | schedule_work(&xfrm_hash_work); | |
523 | } | |
524 | ||
1da177e4 | 525 | struct xfrm_state * |
a716c119 | 526 | xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, |
1da177e4 LT |
527 | struct flowi *fl, struct xfrm_tmpl *tmpl, |
528 | struct xfrm_policy *pol, int *err, | |
529 | unsigned short family) | |
530 | { | |
c1969f29 | 531 | unsigned int h = xfrm_dst_hash(daddr, saddr, tmpl->reqid, family); |
8f126e37 | 532 | struct hlist_node *entry; |
1da177e4 LT |
533 | struct xfrm_state *x, *x0; |
534 | int acquire_in_progress = 0; | |
535 | int error = 0; | |
536 | struct xfrm_state *best = NULL; | |
a716c119 | 537 | |
1da177e4 | 538 | spin_lock_bh(&xfrm_state_lock); |
8f126e37 | 539 | hlist_for_each_entry(x, entry, xfrm_state_bydst+h, bydst) { |
1da177e4 LT |
540 | if (x->props.family == family && |
541 | x->props.reqid == tmpl->reqid && | |
fbd9a5b4 | 542 | !(x->props.flags & XFRM_STATE_WILDRECV) && |
1da177e4 LT |
543 | xfrm_state_addr_check(x, daddr, saddr, family) && |
544 | tmpl->mode == x->props.mode && | |
545 | tmpl->id.proto == x->id.proto && | |
546 | (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) { | |
547 | /* Resolution logic: | |
548 | 1. There is a valid state with matching selector. | |
549 | Done. | |
550 | 2. Valid state with inappropriate selector. Skip. | |
551 | ||
552 | Entering area of "sysdeps". | |
553 | ||
554 | 3. If state is not valid, selector is temporary, | |
555 | it selects only session which triggered | |
556 | previous resolution. Key manager will do | |
557 | something to install a state with proper | |
558 | selector. | |
559 | */ | |
560 | if (x->km.state == XFRM_STATE_VALID) { | |
df71837d | 561 | if (!xfrm_selector_match(&x->sel, fl, family) || |
e0d1caa7 | 562 | !security_xfrm_state_pol_flow_match(x, pol, fl)) |
1da177e4 LT |
563 | continue; |
564 | if (!best || | |
565 | best->km.dying > x->km.dying || | |
566 | (best->km.dying == x->km.dying && | |
567 | best->curlft.add_time < x->curlft.add_time)) | |
568 | best = x; | |
569 | } else if (x->km.state == XFRM_STATE_ACQ) { | |
570 | acquire_in_progress = 1; | |
571 | } else if (x->km.state == XFRM_STATE_ERROR || | |
572 | x->km.state == XFRM_STATE_EXPIRED) { | |
a716c119 | 573 | if (xfrm_selector_match(&x->sel, fl, family) && |
e0d1caa7 | 574 | security_xfrm_state_pol_flow_match(x, pol, fl)) |
1da177e4 LT |
575 | error = -ESRCH; |
576 | } | |
577 | } | |
578 | } | |
579 | ||
580 | x = best; | |
581 | if (!x && !error && !acquire_in_progress) { | |
5c5d281a | 582 | if (tmpl->id.spi && |
edcd5821 DM |
583 | (x0 = __xfrm_state_lookup(daddr, tmpl->id.spi, |
584 | tmpl->id.proto, family)) != NULL) { | |
1da177e4 LT |
585 | xfrm_state_put(x0); |
586 | error = -EEXIST; | |
587 | goto out; | |
588 | } | |
589 | x = xfrm_state_alloc(); | |
590 | if (x == NULL) { | |
591 | error = -ENOMEM; | |
592 | goto out; | |
593 | } | |
594 | /* Initialize temporary selector matching only | |
595 | * to current session. */ | |
596 | xfrm_init_tempsel(x, fl, tmpl, daddr, saddr, family); | |
597 | ||
e0d1caa7 VY |
598 | error = security_xfrm_state_alloc_acquire(x, pol->security, fl->secid); |
599 | if (error) { | |
600 | x->km.state = XFRM_STATE_DEAD; | |
601 | xfrm_state_put(x); | |
602 | x = NULL; | |
603 | goto out; | |
604 | } | |
605 | ||
1da177e4 LT |
606 | if (km_query(x, tmpl, pol) == 0) { |
607 | x->km.state = XFRM_STATE_ACQ; | |
8f126e37 | 608 | hlist_add_head(&x->bydst, xfrm_state_bydst+h); |
667bbcb6 | 609 | h = xfrm_src_hash(daddr, saddr, family); |
8f126e37 | 610 | hlist_add_head(&x->bysrc, xfrm_state_bysrc+h); |
1da177e4 LT |
611 | if (x->id.spi) { |
612 | h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, family); | |
8f126e37 | 613 | hlist_add_head(&x->byspi, xfrm_state_byspi+h); |
1da177e4 LT |
614 | } |
615 | x->lft.hard_add_expires_seconds = XFRM_ACQ_EXPIRES; | |
1da177e4 LT |
616 | x->timer.expires = jiffies + XFRM_ACQ_EXPIRES*HZ; |
617 | add_timer(&x->timer); | |
2fab22f2 PM |
618 | xfrm_state_num++; |
619 | xfrm_hash_grow_check(x->bydst.next != NULL); | |
1da177e4 LT |
620 | } else { |
621 | x->km.state = XFRM_STATE_DEAD; | |
622 | xfrm_state_put(x); | |
623 | x = NULL; | |
624 | error = -ESRCH; | |
625 | } | |
626 | } | |
627 | out: | |
628 | if (x) | |
629 | xfrm_state_hold(x); | |
630 | else | |
631 | *err = acquire_in_progress ? -EAGAIN : error; | |
632 | spin_unlock_bh(&xfrm_state_lock); | |
1da177e4 LT |
633 | return x; |
634 | } | |
635 | ||
636 | static void __xfrm_state_insert(struct xfrm_state *x) | |
637 | { | |
a624c108 | 638 | unsigned int h; |
1da177e4 | 639 | |
9d4a706d DM |
640 | x->genid = ++xfrm_state_genid; |
641 | ||
c1969f29 DM |
642 | h = xfrm_dst_hash(&x->id.daddr, &x->props.saddr, |
643 | x->props.reqid, x->props.family); | |
8f126e37 | 644 | hlist_add_head(&x->bydst, xfrm_state_bydst+h); |
1da177e4 | 645 | |
667bbcb6 | 646 | h = xfrm_src_hash(&x->id.daddr, &x->props.saddr, x->props.family); |
8f126e37 | 647 | hlist_add_head(&x->bysrc, xfrm_state_bysrc+h); |
1da177e4 | 648 | |
7b4dc360 | 649 | if (x->id.spi) { |
6c44e6b7 MN |
650 | h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, |
651 | x->props.family); | |
652 | ||
8f126e37 | 653 | hlist_add_head(&x->byspi, xfrm_state_byspi+h); |
6c44e6b7 MN |
654 | } |
655 | ||
a47f0ce0 DM |
656 | mod_timer(&x->timer, jiffies + HZ); |
657 | if (x->replay_maxage) | |
658 | mod_timer(&x->rtimer, jiffies + x->replay_maxage); | |
f8cd5488 | 659 | |
1da177e4 | 660 | wake_up(&km_waitq); |
f034b5d4 DM |
661 | |
662 | xfrm_state_num++; | |
663 | ||
918049f0 | 664 | xfrm_hash_grow_check(x->bydst.next != NULL); |
1da177e4 LT |
665 | } |
666 | ||
c7f5ea3a DM |
667 | /* xfrm_state_lock is held */ |
668 | static void __xfrm_state_bump_genids(struct xfrm_state *xnew) | |
669 | { | |
670 | unsigned short family = xnew->props.family; | |
671 | u32 reqid = xnew->props.reqid; | |
672 | struct xfrm_state *x; | |
673 | struct hlist_node *entry; | |
674 | unsigned int h; | |
675 | ||
c1969f29 | 676 | h = xfrm_dst_hash(&xnew->id.daddr, &xnew->props.saddr, reqid, family); |
c7f5ea3a DM |
677 | hlist_for_each_entry(x, entry, xfrm_state_bydst+h, bydst) { |
678 | if (x->props.family == family && | |
679 | x->props.reqid == reqid && | |
c1969f29 DM |
680 | !xfrm_addr_cmp(&x->id.daddr, &xnew->id.daddr, family) && |
681 | !xfrm_addr_cmp(&x->props.saddr, &xnew->props.saddr, family)) | |
c7f5ea3a DM |
682 | x->genid = xfrm_state_genid; |
683 | } | |
684 | } | |
685 | ||
1da177e4 LT |
686 | void xfrm_state_insert(struct xfrm_state *x) |
687 | { | |
688 | spin_lock_bh(&xfrm_state_lock); | |
c7f5ea3a | 689 | __xfrm_state_bump_genids(x); |
1da177e4 LT |
690 | __xfrm_state_insert(x); |
691 | spin_unlock_bh(&xfrm_state_lock); | |
692 | } | |
693 | EXPORT_SYMBOL(xfrm_state_insert); | |
694 | ||
2770834c DM |
695 | /* xfrm_state_lock is held */ |
696 | 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) | |
697 | { | |
c1969f29 | 698 | unsigned int h = xfrm_dst_hash(daddr, saddr, reqid, family); |
8f126e37 | 699 | struct hlist_node *entry; |
2770834c DM |
700 | struct xfrm_state *x; |
701 | ||
8f126e37 | 702 | hlist_for_each_entry(x, entry, xfrm_state_bydst+h, bydst) { |
2770834c DM |
703 | if (x->props.reqid != reqid || |
704 | x->props.mode != mode || | |
705 | x->props.family != family || | |
706 | x->km.state != XFRM_STATE_ACQ || | |
707 | x->id.spi != 0) | |
708 | continue; | |
709 | ||
710 | switch (family) { | |
711 | case AF_INET: | |
712 | if (x->id.daddr.a4 != daddr->a4 || | |
713 | x->props.saddr.a4 != saddr->a4) | |
714 | continue; | |
715 | break; | |
716 | case AF_INET6: | |
717 | if (!ipv6_addr_equal((struct in6_addr *)x->id.daddr.a6, | |
718 | (struct in6_addr *)daddr) || | |
719 | !ipv6_addr_equal((struct in6_addr *) | |
720 | x->props.saddr.a6, | |
721 | (struct in6_addr *)saddr)) | |
722 | continue; | |
723 | break; | |
724 | }; | |
725 | ||
726 | xfrm_state_hold(x); | |
727 | return x; | |
728 | } | |
729 | ||
730 | if (!create) | |
731 | return NULL; | |
732 | ||
733 | x = xfrm_state_alloc(); | |
734 | if (likely(x)) { | |
735 | switch (family) { | |
736 | case AF_INET: | |
737 | x->sel.daddr.a4 = daddr->a4; | |
738 | x->sel.saddr.a4 = saddr->a4; | |
739 | x->sel.prefixlen_d = 32; | |
740 | x->sel.prefixlen_s = 32; | |
741 | x->props.saddr.a4 = saddr->a4; | |
742 | x->id.daddr.a4 = daddr->a4; | |
743 | break; | |
744 | ||
745 | case AF_INET6: | |
746 | ipv6_addr_copy((struct in6_addr *)x->sel.daddr.a6, | |
747 | (struct in6_addr *)daddr); | |
748 | ipv6_addr_copy((struct in6_addr *)x->sel.saddr.a6, | |
749 | (struct in6_addr *)saddr); | |
750 | x->sel.prefixlen_d = 128; | |
751 | x->sel.prefixlen_s = 128; | |
752 | ipv6_addr_copy((struct in6_addr *)x->props.saddr.a6, | |
753 | (struct in6_addr *)saddr); | |
754 | ipv6_addr_copy((struct in6_addr *)x->id.daddr.a6, | |
755 | (struct in6_addr *)daddr); | |
756 | break; | |
757 | }; | |
758 | ||
759 | x->km.state = XFRM_STATE_ACQ; | |
760 | x->id.proto = proto; | |
761 | x->props.family = family; | |
762 | x->props.mode = mode; | |
763 | x->props.reqid = reqid; | |
764 | x->lft.hard_add_expires_seconds = XFRM_ACQ_EXPIRES; | |
765 | xfrm_state_hold(x); | |
766 | x->timer.expires = jiffies + XFRM_ACQ_EXPIRES*HZ; | |
767 | add_timer(&x->timer); | |
8f126e37 | 768 | hlist_add_head(&x->bydst, xfrm_state_bydst+h); |
667bbcb6 | 769 | h = xfrm_src_hash(daddr, saddr, family); |
8f126e37 | 770 | hlist_add_head(&x->bysrc, xfrm_state_bysrc+h); |
2770834c | 771 | wake_up(&km_waitq); |
918049f0 DM |
772 | |
773 | xfrm_state_num++; | |
774 | ||
775 | xfrm_hash_grow_check(x->bydst.next != NULL); | |
2770834c DM |
776 | } |
777 | ||
778 | return x; | |
779 | } | |
780 | ||
1da177e4 LT |
781 | static struct xfrm_state *__xfrm_find_acq_byseq(u32 seq); |
782 | ||
783 | int xfrm_state_add(struct xfrm_state *x) | |
784 | { | |
1da177e4 LT |
785 | struct xfrm_state *x1; |
786 | int family; | |
787 | int err; | |
eb2971b6 | 788 | int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); |
1da177e4 LT |
789 | |
790 | family = x->props.family; | |
1da177e4 LT |
791 | |
792 | spin_lock_bh(&xfrm_state_lock); | |
793 | ||
edcd5821 | 794 | x1 = __xfrm_state_locate(x, use_spi, family); |
1da177e4 LT |
795 | if (x1) { |
796 | xfrm_state_put(x1); | |
797 | x1 = NULL; | |
798 | err = -EEXIST; | |
799 | goto out; | |
800 | } | |
801 | ||
eb2971b6 | 802 | if (use_spi && x->km.seq) { |
1da177e4 LT |
803 | x1 = __xfrm_find_acq_byseq(x->km.seq); |
804 | if (x1 && xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family)) { | |
805 | xfrm_state_put(x1); | |
806 | x1 = NULL; | |
807 | } | |
808 | } | |
809 | ||
eb2971b6 | 810 | if (use_spi && !x1) |
2770834c DM |
811 | x1 = __find_acq_core(family, x->props.mode, x->props.reqid, |
812 | x->id.proto, | |
813 | &x->id.daddr, &x->props.saddr, 0); | |
1da177e4 | 814 | |
c7f5ea3a | 815 | __xfrm_state_bump_genids(x); |
1da177e4 LT |
816 | __xfrm_state_insert(x); |
817 | err = 0; | |
818 | ||
819 | out: | |
820 | spin_unlock_bh(&xfrm_state_lock); | |
1da177e4 LT |
821 | |
822 | if (x1) { | |
823 | xfrm_state_delete(x1); | |
824 | xfrm_state_put(x1); | |
825 | } | |
826 | ||
827 | return err; | |
828 | } | |
829 | EXPORT_SYMBOL(xfrm_state_add); | |
830 | ||
80c9abaa SS |
831 | #ifdef CONFIG_XFRM_MIGRATE |
832 | struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, int *errp) | |
833 | { | |
834 | int err = -ENOMEM; | |
835 | struct xfrm_state *x = xfrm_state_alloc(); | |
836 | if (!x) | |
837 | goto error; | |
838 | ||
839 | memcpy(&x->id, &orig->id, sizeof(x->id)); | |
840 | memcpy(&x->sel, &orig->sel, sizeof(x->sel)); | |
841 | memcpy(&x->lft, &orig->lft, sizeof(x->lft)); | |
842 | x->props.mode = orig->props.mode; | |
843 | x->props.replay_window = orig->props.replay_window; | |
844 | x->props.reqid = orig->props.reqid; | |
845 | x->props.family = orig->props.family; | |
846 | x->props.saddr = orig->props.saddr; | |
847 | ||
848 | if (orig->aalg) { | |
849 | x->aalg = xfrm_algo_clone(orig->aalg); | |
850 | if (!x->aalg) | |
851 | goto error; | |
852 | } | |
853 | x->props.aalgo = orig->props.aalgo; | |
854 | ||
855 | if (orig->ealg) { | |
856 | x->ealg = xfrm_algo_clone(orig->ealg); | |
857 | if (!x->ealg) | |
858 | goto error; | |
859 | } | |
860 | x->props.ealgo = orig->props.ealgo; | |
861 | ||
862 | if (orig->calg) { | |
863 | x->calg = xfrm_algo_clone(orig->calg); | |
864 | if (!x->calg) | |
865 | goto error; | |
866 | } | |
867 | x->props.calgo = orig->props.calgo; | |
868 | ||
a716c119 | 869 | if (orig->encap) { |
80c9abaa SS |
870 | x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL); |
871 | if (!x->encap) | |
872 | goto error; | |
873 | } | |
874 | ||
875 | if (orig->coaddr) { | |
876 | x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr), | |
877 | GFP_KERNEL); | |
878 | if (!x->coaddr) | |
879 | goto error; | |
880 | } | |
881 | ||
882 | err = xfrm_init_state(x); | |
883 | if (err) | |
884 | goto error; | |
885 | ||
886 | x->props.flags = orig->props.flags; | |
887 | ||
888 | x->curlft.add_time = orig->curlft.add_time; | |
889 | x->km.state = orig->km.state; | |
890 | x->km.seq = orig->km.seq; | |
891 | ||
892 | return x; | |
893 | ||
894 | error: | |
895 | if (errp) | |
896 | *errp = err; | |
897 | if (x) { | |
898 | kfree(x->aalg); | |
899 | kfree(x->ealg); | |
900 | kfree(x->calg); | |
901 | kfree(x->encap); | |
902 | kfree(x->coaddr); | |
903 | } | |
904 | kfree(x); | |
905 | return NULL; | |
906 | } | |
907 | EXPORT_SYMBOL(xfrm_state_clone); | |
908 | ||
909 | /* xfrm_state_lock is held */ | |
910 | struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m) | |
911 | { | |
912 | unsigned int h; | |
913 | struct xfrm_state *x; | |
914 | struct hlist_node *entry; | |
915 | ||
916 | if (m->reqid) { | |
917 | h = xfrm_dst_hash(&m->old_daddr, &m->old_saddr, | |
918 | m->reqid, m->old_family); | |
919 | hlist_for_each_entry(x, entry, xfrm_state_bydst+h, bydst) { | |
920 | if (x->props.mode != m->mode || | |
921 | x->id.proto != m->proto) | |
922 | continue; | |
923 | if (m->reqid && x->props.reqid != m->reqid) | |
924 | continue; | |
925 | if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr, | |
926 | m->old_family) || | |
927 | xfrm_addr_cmp(&x->props.saddr, &m->old_saddr, | |
928 | m->old_family)) | |
929 | continue; | |
930 | xfrm_state_hold(x); | |
931 | return x; | |
932 | } | |
933 | } else { | |
934 | h = xfrm_src_hash(&m->old_daddr, &m->old_saddr, | |
935 | m->old_family); | |
936 | hlist_for_each_entry(x, entry, xfrm_state_bysrc+h, bysrc) { | |
937 | if (x->props.mode != m->mode || | |
938 | x->id.proto != m->proto) | |
939 | continue; | |
940 | if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr, | |
941 | m->old_family) || | |
942 | xfrm_addr_cmp(&x->props.saddr, &m->old_saddr, | |
943 | m->old_family)) | |
944 | continue; | |
945 | xfrm_state_hold(x); | |
946 | return x; | |
947 | } | |
948 | } | |
949 | ||
a716c119 | 950 | return NULL; |
80c9abaa SS |
951 | } |
952 | EXPORT_SYMBOL(xfrm_migrate_state_find); | |
953 | ||
954 | struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x, | |
955 | struct xfrm_migrate *m) | |
956 | { | |
957 | struct xfrm_state *xc; | |
958 | int err; | |
959 | ||
960 | xc = xfrm_state_clone(x, &err); | |
961 | if (!xc) | |
962 | return NULL; | |
963 | ||
964 | memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr)); | |
965 | memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr)); | |
966 | ||
967 | /* add state */ | |
968 | if (!xfrm_addr_cmp(&x->id.daddr, &m->new_daddr, m->new_family)) { | |
969 | /* a care is needed when the destination address of the | |
970 | state is to be updated as it is a part of triplet */ | |
971 | xfrm_state_insert(xc); | |
972 | } else { | |
973 | if ((err = xfrm_state_add(xc)) < 0) | |
974 | goto error; | |
975 | } | |
976 | ||
977 | return xc; | |
978 | error: | |
979 | kfree(xc); | |
980 | return NULL; | |
981 | } | |
982 | EXPORT_SYMBOL(xfrm_state_migrate); | |
983 | #endif | |
984 | ||
1da177e4 LT |
985 | int xfrm_state_update(struct xfrm_state *x) |
986 | { | |
1da177e4 LT |
987 | struct xfrm_state *x1; |
988 | int err; | |
eb2971b6 | 989 | int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); |
1da177e4 | 990 | |
1da177e4 | 991 | spin_lock_bh(&xfrm_state_lock); |
edcd5821 | 992 | x1 = __xfrm_state_locate(x, use_spi, x->props.family); |
1da177e4 LT |
993 | |
994 | err = -ESRCH; | |
995 | if (!x1) | |
996 | goto out; | |
997 | ||
998 | if (xfrm_state_kern(x1)) { | |
999 | xfrm_state_put(x1); | |
1000 | err = -EEXIST; | |
1001 | goto out; | |
1002 | } | |
1003 | ||
1004 | if (x1->km.state == XFRM_STATE_ACQ) { | |
1005 | __xfrm_state_insert(x); | |
1006 | x = NULL; | |
1007 | } | |
1008 | err = 0; | |
1009 | ||
1010 | out: | |
1011 | spin_unlock_bh(&xfrm_state_lock); | |
1da177e4 LT |
1012 | |
1013 | if (err) | |
1014 | return err; | |
1015 | ||
1016 | if (!x) { | |
1017 | xfrm_state_delete(x1); | |
1018 | xfrm_state_put(x1); | |
1019 | return 0; | |
1020 | } | |
1021 | ||
1022 | err = -EINVAL; | |
1023 | spin_lock_bh(&x1->lock); | |
1024 | if (likely(x1->km.state == XFRM_STATE_VALID)) { | |
1025 | if (x->encap && x1->encap) | |
1026 | memcpy(x1->encap, x->encap, sizeof(*x1->encap)); | |
060f02a3 NT |
1027 | if (x->coaddr && x1->coaddr) { |
1028 | memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr)); | |
1029 | } | |
1030 | if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel))) | |
1031 | memcpy(&x1->sel, &x->sel, sizeof(x1->sel)); | |
1da177e4 LT |
1032 | memcpy(&x1->lft, &x->lft, sizeof(x1->lft)); |
1033 | x1->km.dying = 0; | |
1034 | ||
a47f0ce0 | 1035 | mod_timer(&x1->timer, jiffies + HZ); |
1da177e4 LT |
1036 | if (x1->curlft.use_time) |
1037 | xfrm_state_check_expire(x1); | |
1038 | ||
1039 | err = 0; | |
1040 | } | |
1041 | spin_unlock_bh(&x1->lock); | |
1042 | ||
1043 | xfrm_state_put(x1); | |
1044 | ||
1045 | return err; | |
1046 | } | |
1047 | EXPORT_SYMBOL(xfrm_state_update); | |
1048 | ||
1049 | int xfrm_state_check_expire(struct xfrm_state *x) | |
1050 | { | |
1051 | if (!x->curlft.use_time) | |
1052 | x->curlft.use_time = (unsigned long)xtime.tv_sec; | |
1053 | ||
1054 | if (x->km.state != XFRM_STATE_VALID) | |
1055 | return -EINVAL; | |
1056 | ||
1057 | if (x->curlft.bytes >= x->lft.hard_byte_limit || | |
1058 | x->curlft.packets >= x->lft.hard_packet_limit) { | |
4666faab | 1059 | x->km.state = XFRM_STATE_EXPIRED; |
a47f0ce0 | 1060 | mod_timer(&x->timer, jiffies); |
1da177e4 LT |
1061 | return -EINVAL; |
1062 | } | |
1063 | ||
1064 | if (!x->km.dying && | |
1065 | (x->curlft.bytes >= x->lft.soft_byte_limit || | |
4666faab HX |
1066 | x->curlft.packets >= x->lft.soft_packet_limit)) { |
1067 | x->km.dying = 1; | |
53bc6b4d | 1068 | km_state_expired(x, 0, 0); |
4666faab | 1069 | } |
1da177e4 LT |
1070 | return 0; |
1071 | } | |
1072 | EXPORT_SYMBOL(xfrm_state_check_expire); | |
1073 | ||
1074 | static int xfrm_state_check_space(struct xfrm_state *x, struct sk_buff *skb) | |
1075 | { | |
1076 | int nhead = x->props.header_len + LL_RESERVED_SPACE(skb->dst->dev) | |
1077 | - skb_headroom(skb); | |
1078 | ||
1079 | if (nhead > 0) | |
1080 | return pskb_expand_head(skb, nhead, 0, GFP_ATOMIC); | |
1081 | ||
1082 | /* Check tail too... */ | |
1083 | return 0; | |
1084 | } | |
1085 | ||
1086 | int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb) | |
1087 | { | |
1088 | int err = xfrm_state_check_expire(x); | |
1089 | if (err < 0) | |
1090 | goto err; | |
1091 | err = xfrm_state_check_space(x, skb); | |
1092 | err: | |
1093 | return err; | |
1094 | } | |
1095 | EXPORT_SYMBOL(xfrm_state_check); | |
1096 | ||
1097 | struct xfrm_state * | |
a94cfd19 | 1098 | xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, |
1da177e4 LT |
1099 | unsigned short family) |
1100 | { | |
1101 | struct xfrm_state *x; | |
1da177e4 LT |
1102 | |
1103 | spin_lock_bh(&xfrm_state_lock); | |
edcd5821 | 1104 | x = __xfrm_state_lookup(daddr, spi, proto, family); |
1da177e4 | 1105 | spin_unlock_bh(&xfrm_state_lock); |
1da177e4 LT |
1106 | return x; |
1107 | } | |
1108 | EXPORT_SYMBOL(xfrm_state_lookup); | |
1109 | ||
1110 | struct xfrm_state * | |
eb2971b6 MN |
1111 | xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, |
1112 | u8 proto, unsigned short family) | |
1113 | { | |
1114 | struct xfrm_state *x; | |
eb2971b6 MN |
1115 | |
1116 | spin_lock_bh(&xfrm_state_lock); | |
edcd5821 | 1117 | x = __xfrm_state_lookup_byaddr(daddr, saddr, proto, family); |
eb2971b6 | 1118 | spin_unlock_bh(&xfrm_state_lock); |
eb2971b6 MN |
1119 | return x; |
1120 | } | |
1121 | EXPORT_SYMBOL(xfrm_state_lookup_byaddr); | |
1122 | ||
1123 | struct xfrm_state * | |
a716c119 YH |
1124 | xfrm_find_acq(u8 mode, u32 reqid, u8 proto, |
1125 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
1da177e4 LT |
1126 | int create, unsigned short family) |
1127 | { | |
1128 | struct xfrm_state *x; | |
1da177e4 LT |
1129 | |
1130 | spin_lock_bh(&xfrm_state_lock); | |
2770834c | 1131 | x = __find_acq_core(family, mode, reqid, proto, daddr, saddr, create); |
1da177e4 | 1132 | spin_unlock_bh(&xfrm_state_lock); |
2770834c | 1133 | |
1da177e4 LT |
1134 | return x; |
1135 | } | |
1136 | EXPORT_SYMBOL(xfrm_find_acq); | |
1137 | ||
41a49cc3 MN |
1138 | #ifdef CONFIG_XFRM_SUB_POLICY |
1139 | int | |
1140 | xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, | |
1141 | unsigned short family) | |
1142 | { | |
1143 | int err = 0; | |
1144 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
1145 | if (!afinfo) | |
1146 | return -EAFNOSUPPORT; | |
1147 | ||
1148 | spin_lock_bh(&xfrm_state_lock); | |
1149 | if (afinfo->tmpl_sort) | |
1150 | err = afinfo->tmpl_sort(dst, src, n); | |
1151 | spin_unlock_bh(&xfrm_state_lock); | |
1152 | xfrm_state_put_afinfo(afinfo); | |
1153 | return err; | |
1154 | } | |
1155 | EXPORT_SYMBOL(xfrm_tmpl_sort); | |
1156 | ||
1157 | int | |
1158 | xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, | |
1159 | unsigned short family) | |
1160 | { | |
1161 | int err = 0; | |
1162 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
1163 | if (!afinfo) | |
1164 | return -EAFNOSUPPORT; | |
1165 | ||
1166 | spin_lock_bh(&xfrm_state_lock); | |
1167 | if (afinfo->state_sort) | |
1168 | err = afinfo->state_sort(dst, src, n); | |
1169 | spin_unlock_bh(&xfrm_state_lock); | |
1170 | xfrm_state_put_afinfo(afinfo); | |
1171 | return err; | |
1172 | } | |
1173 | EXPORT_SYMBOL(xfrm_state_sort); | |
1174 | #endif | |
1175 | ||
1da177e4 LT |
1176 | /* Silly enough, but I'm lazy to build resolution list */ |
1177 | ||
1178 | static struct xfrm_state *__xfrm_find_acq_byseq(u32 seq) | |
1179 | { | |
1180 | int i; | |
1da177e4 | 1181 | |
f034b5d4 | 1182 | for (i = 0; i <= xfrm_state_hmask; i++) { |
8f126e37 DM |
1183 | struct hlist_node *entry; |
1184 | struct xfrm_state *x; | |
1185 | ||
1186 | hlist_for_each_entry(x, entry, xfrm_state_bydst+i, bydst) { | |
1187 | if (x->km.seq == seq && | |
1188 | x->km.state == XFRM_STATE_ACQ) { | |
1da177e4 LT |
1189 | xfrm_state_hold(x); |
1190 | return x; | |
1191 | } | |
1192 | } | |
1193 | } | |
1194 | return NULL; | |
1195 | } | |
1196 | ||
1197 | struct xfrm_state *xfrm_find_acq_byseq(u32 seq) | |
1198 | { | |
1199 | struct xfrm_state *x; | |
1200 | ||
1201 | spin_lock_bh(&xfrm_state_lock); | |
1202 | x = __xfrm_find_acq_byseq(seq); | |
1203 | spin_unlock_bh(&xfrm_state_lock); | |
1204 | return x; | |
1205 | } | |
1206 | EXPORT_SYMBOL(xfrm_find_acq_byseq); | |
1207 | ||
1208 | u32 xfrm_get_acqseq(void) | |
1209 | { | |
1210 | u32 res; | |
1211 | static u32 acqseq; | |
1212 | static DEFINE_SPINLOCK(acqseq_lock); | |
1213 | ||
1214 | spin_lock_bh(&acqseq_lock); | |
1215 | res = (++acqseq ? : ++acqseq); | |
1216 | spin_unlock_bh(&acqseq_lock); | |
1217 | return res; | |
1218 | } | |
1219 | EXPORT_SYMBOL(xfrm_get_acqseq); | |
1220 | ||
1221 | void | |
26977b4e | 1222 | xfrm_alloc_spi(struct xfrm_state *x, __be32 minspi, __be32 maxspi) |
1da177e4 | 1223 | { |
f034b5d4 | 1224 | unsigned int h; |
1da177e4 LT |
1225 | struct xfrm_state *x0; |
1226 | ||
1227 | if (x->id.spi) | |
1228 | return; | |
1229 | ||
1230 | if (minspi == maxspi) { | |
1231 | x0 = xfrm_state_lookup(&x->id.daddr, minspi, x->id.proto, x->props.family); | |
1232 | if (x0) { | |
1233 | xfrm_state_put(x0); | |
1234 | return; | |
1235 | } | |
1236 | x->id.spi = minspi; | |
1237 | } else { | |
1238 | u32 spi = 0; | |
26977b4e AV |
1239 | u32 low = ntohl(minspi); |
1240 | u32 high = ntohl(maxspi); | |
1241 | for (h=0; h<high-low+1; h++) { | |
1242 | spi = low + net_random()%(high-low+1); | |
1da177e4 LT |
1243 | x0 = xfrm_state_lookup(&x->id.daddr, htonl(spi), x->id.proto, x->props.family); |
1244 | if (x0 == NULL) { | |
1245 | x->id.spi = htonl(spi); | |
1246 | break; | |
1247 | } | |
1248 | xfrm_state_put(x0); | |
1249 | } | |
1250 | } | |
1251 | if (x->id.spi) { | |
1252 | spin_lock_bh(&xfrm_state_lock); | |
1253 | h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, x->props.family); | |
8f126e37 | 1254 | hlist_add_head(&x->byspi, xfrm_state_byspi+h); |
1da177e4 LT |
1255 | spin_unlock_bh(&xfrm_state_lock); |
1256 | wake_up(&km_waitq); | |
1257 | } | |
1258 | } | |
1259 | EXPORT_SYMBOL(xfrm_alloc_spi); | |
1260 | ||
1261 | int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), | |
1262 | void *data) | |
1263 | { | |
1264 | int i; | |
94b9bb54 | 1265 | struct xfrm_state *x, *last = NULL; |
8f126e37 | 1266 | struct hlist_node *entry; |
1da177e4 LT |
1267 | int count = 0; |
1268 | int err = 0; | |
1269 | ||
1270 | spin_lock_bh(&xfrm_state_lock); | |
f034b5d4 | 1271 | for (i = 0; i <= xfrm_state_hmask; i++) { |
8f126e37 | 1272 | hlist_for_each_entry(x, entry, xfrm_state_bydst+i, bydst) { |
94b9bb54 JHS |
1273 | if (!xfrm_id_proto_match(x->id.proto, proto)) |
1274 | continue; | |
1275 | if (last) { | |
1276 | err = func(last, count, data); | |
1277 | if (err) | |
1278 | goto out; | |
1279 | } | |
1280 | last = x; | |
1281 | count++; | |
1da177e4 LT |
1282 | } |
1283 | } | |
1284 | if (count == 0) { | |
1285 | err = -ENOENT; | |
1286 | goto out; | |
1287 | } | |
94b9bb54 | 1288 | err = func(last, 0, data); |
1da177e4 LT |
1289 | out: |
1290 | spin_unlock_bh(&xfrm_state_lock); | |
1291 | return err; | |
1292 | } | |
1293 | EXPORT_SYMBOL(xfrm_state_walk); | |
1294 | ||
f8cd5488 JHS |
1295 | |
1296 | void xfrm_replay_notify(struct xfrm_state *x, int event) | |
1297 | { | |
1298 | struct km_event c; | |
1299 | /* we send notify messages in case | |
1300 | * 1. we updated on of the sequence numbers, and the seqno difference | |
1301 | * is at least x->replay_maxdiff, in this case we also update the | |
1302 | * timeout of our timer function | |
1303 | * 2. if x->replay_maxage has elapsed since last update, | |
1304 | * and there were changes | |
1305 | * | |
1306 | * The state structure must be locked! | |
1307 | */ | |
1308 | ||
1309 | switch (event) { | |
1310 | case XFRM_REPLAY_UPDATE: | |
1311 | if (x->replay_maxdiff && | |
1312 | (x->replay.seq - x->preplay.seq < x->replay_maxdiff) && | |
2717096a JHS |
1313 | (x->replay.oseq - x->preplay.oseq < x->replay_maxdiff)) { |
1314 | if (x->xflags & XFRM_TIME_DEFER) | |
1315 | event = XFRM_REPLAY_TIMEOUT; | |
1316 | else | |
1317 | return; | |
1318 | } | |
f8cd5488 JHS |
1319 | |
1320 | break; | |
1321 | ||
1322 | case XFRM_REPLAY_TIMEOUT: | |
1323 | if ((x->replay.seq == x->preplay.seq) && | |
1324 | (x->replay.bitmap == x->preplay.bitmap) && | |
2717096a JHS |
1325 | (x->replay.oseq == x->preplay.oseq)) { |
1326 | x->xflags |= XFRM_TIME_DEFER; | |
f8cd5488 | 1327 | return; |
2717096a | 1328 | } |
f8cd5488 JHS |
1329 | |
1330 | break; | |
1331 | } | |
1332 | ||
1333 | memcpy(&x->preplay, &x->replay, sizeof(struct xfrm_replay_state)); | |
1334 | c.event = XFRM_MSG_NEWAE; | |
1335 | c.data.aevent = event; | |
1336 | km_state_notify(x, &c); | |
1337 | ||
f8cd5488 | 1338 | if (x->replay_maxage && |
a47f0ce0 | 1339 | !mod_timer(&x->rtimer, jiffies + x->replay_maxage)) |
2717096a | 1340 | x->xflags &= ~XFRM_TIME_DEFER; |
f8cd5488 | 1341 | } |
a70fcb0b | 1342 | EXPORT_SYMBOL(xfrm_replay_notify); |
f8cd5488 JHS |
1343 | |
1344 | static void xfrm_replay_timer_handler(unsigned long data) | |
1345 | { | |
1346 | struct xfrm_state *x = (struct xfrm_state*)data; | |
1347 | ||
1348 | spin_lock(&x->lock); | |
1349 | ||
2717096a JHS |
1350 | if (x->km.state == XFRM_STATE_VALID) { |
1351 | if (xfrm_aevent_is_on()) | |
1352 | xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT); | |
1353 | else | |
1354 | x->xflags |= XFRM_TIME_DEFER; | |
1355 | } | |
f8cd5488 JHS |
1356 | |
1357 | spin_unlock(&x->lock); | |
1358 | } | |
1359 | ||
a252cc23 | 1360 | int xfrm_replay_check(struct xfrm_state *x, __be32 net_seq) |
1da177e4 LT |
1361 | { |
1362 | u32 diff; | |
a252cc23 | 1363 | u32 seq = ntohl(net_seq); |
1da177e4 LT |
1364 | |
1365 | if (unlikely(seq == 0)) | |
1366 | return -EINVAL; | |
1367 | ||
1368 | if (likely(seq > x->replay.seq)) | |
1369 | return 0; | |
1370 | ||
1371 | diff = x->replay.seq - seq; | |
1372 | if (diff >= x->props.replay_window) { | |
1373 | x->stats.replay_window++; | |
1374 | return -EINVAL; | |
1375 | } | |
1376 | ||
1377 | if (x->replay.bitmap & (1U << diff)) { | |
1378 | x->stats.replay++; | |
1379 | return -EINVAL; | |
1380 | } | |
1381 | return 0; | |
1382 | } | |
1383 | EXPORT_SYMBOL(xfrm_replay_check); | |
1384 | ||
61f4627b | 1385 | void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq) |
1da177e4 LT |
1386 | { |
1387 | u32 diff; | |
61f4627b | 1388 | u32 seq = ntohl(net_seq); |
1da177e4 LT |
1389 | |
1390 | if (seq > x->replay.seq) { | |
1391 | diff = seq - x->replay.seq; | |
1392 | if (diff < x->props.replay_window) | |
1393 | x->replay.bitmap = ((x->replay.bitmap) << diff) | 1; | |
1394 | else | |
1395 | x->replay.bitmap = 1; | |
1396 | x->replay.seq = seq; | |
1397 | } else { | |
1398 | diff = x->replay.seq - seq; | |
1399 | x->replay.bitmap |= (1U << diff); | |
1400 | } | |
f8cd5488 JHS |
1401 | |
1402 | if (xfrm_aevent_is_on()) | |
1403 | xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); | |
1da177e4 LT |
1404 | } |
1405 | EXPORT_SYMBOL(xfrm_replay_advance); | |
1406 | ||
1407 | static struct list_head xfrm_km_list = LIST_HEAD_INIT(xfrm_km_list); | |
1408 | static DEFINE_RWLOCK(xfrm_km_lock); | |
1409 | ||
26b15dad | 1410 | void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) |
1da177e4 LT |
1411 | { |
1412 | struct xfrm_mgr *km; | |
1413 | ||
26b15dad JHS |
1414 | read_lock(&xfrm_km_lock); |
1415 | list_for_each_entry(km, &xfrm_km_list, list) | |
1416 | if (km->notify_policy) | |
1417 | km->notify_policy(xp, dir, c); | |
1418 | read_unlock(&xfrm_km_lock); | |
1419 | } | |
1da177e4 | 1420 | |
26b15dad JHS |
1421 | void km_state_notify(struct xfrm_state *x, struct km_event *c) |
1422 | { | |
1423 | struct xfrm_mgr *km; | |
1da177e4 LT |
1424 | read_lock(&xfrm_km_lock); |
1425 | list_for_each_entry(km, &xfrm_km_list, list) | |
26b15dad JHS |
1426 | if (km->notify) |
1427 | km->notify(x, c); | |
1da177e4 | 1428 | read_unlock(&xfrm_km_lock); |
26b15dad JHS |
1429 | } |
1430 | ||
1431 | EXPORT_SYMBOL(km_policy_notify); | |
1432 | EXPORT_SYMBOL(km_state_notify); | |
1433 | ||
53bc6b4d | 1434 | void km_state_expired(struct xfrm_state *x, int hard, u32 pid) |
26b15dad JHS |
1435 | { |
1436 | struct km_event c; | |
1437 | ||
bf08867f | 1438 | c.data.hard = hard; |
53bc6b4d | 1439 | c.pid = pid; |
f60f6b8f | 1440 | c.event = XFRM_MSG_EXPIRE; |
26b15dad | 1441 | km_state_notify(x, &c); |
1da177e4 LT |
1442 | |
1443 | if (hard) | |
1444 | wake_up(&km_waitq); | |
1445 | } | |
1446 | ||
53bc6b4d | 1447 | EXPORT_SYMBOL(km_state_expired); |
26b15dad JHS |
1448 | /* |
1449 | * We send to all registered managers regardless of failure | |
1450 | * We are happy with one success | |
1451 | */ | |
980ebd25 | 1452 | int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol) |
1da177e4 | 1453 | { |
26b15dad | 1454 | int err = -EINVAL, acqret; |
1da177e4 LT |
1455 | struct xfrm_mgr *km; |
1456 | ||
1457 | read_lock(&xfrm_km_lock); | |
1458 | list_for_each_entry(km, &xfrm_km_list, list) { | |
26b15dad JHS |
1459 | acqret = km->acquire(x, t, pol, XFRM_POLICY_OUT); |
1460 | if (!acqret) | |
1461 | err = acqret; | |
1da177e4 LT |
1462 | } |
1463 | read_unlock(&xfrm_km_lock); | |
1464 | return err; | |
1465 | } | |
980ebd25 | 1466 | EXPORT_SYMBOL(km_query); |
1da177e4 | 1467 | |
5d36b180 | 1468 | int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) |
1da177e4 LT |
1469 | { |
1470 | int err = -EINVAL; | |
1471 | struct xfrm_mgr *km; | |
1472 | ||
1473 | read_lock(&xfrm_km_lock); | |
1474 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1475 | if (km->new_mapping) | |
1476 | err = km->new_mapping(x, ipaddr, sport); | |
1477 | if (!err) | |
1478 | break; | |
1479 | } | |
1480 | read_unlock(&xfrm_km_lock); | |
1481 | return err; | |
1482 | } | |
1483 | EXPORT_SYMBOL(km_new_mapping); | |
1484 | ||
6c5c8ca7 | 1485 | void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid) |
1da177e4 | 1486 | { |
26b15dad | 1487 | struct km_event c; |
1da177e4 | 1488 | |
bf08867f | 1489 | c.data.hard = hard; |
6c5c8ca7 | 1490 | c.pid = pid; |
f60f6b8f | 1491 | c.event = XFRM_MSG_POLEXPIRE; |
26b15dad | 1492 | km_policy_notify(pol, dir, &c); |
1da177e4 LT |
1493 | |
1494 | if (hard) | |
1495 | wake_up(&km_waitq); | |
1496 | } | |
a70fcb0b | 1497 | EXPORT_SYMBOL(km_policy_expired); |
1da177e4 | 1498 | |
80c9abaa SS |
1499 | int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type, |
1500 | struct xfrm_migrate *m, int num_migrate) | |
1501 | { | |
1502 | int err = -EINVAL; | |
1503 | int ret; | |
1504 | struct xfrm_mgr *km; | |
1505 | ||
1506 | read_lock(&xfrm_km_lock); | |
1507 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1508 | if (km->migrate) { | |
1509 | ret = km->migrate(sel, dir, type, m, num_migrate); | |
1510 | if (!ret) | |
1511 | err = ret; | |
1512 | } | |
1513 | } | |
1514 | read_unlock(&xfrm_km_lock); | |
1515 | return err; | |
1516 | } | |
1517 | EXPORT_SYMBOL(km_migrate); | |
1518 | ||
97a64b45 MN |
1519 | int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr) |
1520 | { | |
1521 | int err = -EINVAL; | |
1522 | int ret; | |
1523 | struct xfrm_mgr *km; | |
1524 | ||
1525 | read_lock(&xfrm_km_lock); | |
1526 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1527 | if (km->report) { | |
1528 | ret = km->report(proto, sel, addr); | |
1529 | if (!ret) | |
1530 | err = ret; | |
1531 | } | |
1532 | } | |
1533 | read_unlock(&xfrm_km_lock); | |
1534 | return err; | |
1535 | } | |
1536 | EXPORT_SYMBOL(km_report); | |
1537 | ||
1da177e4 LT |
1538 | int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) |
1539 | { | |
1540 | int err; | |
1541 | u8 *data; | |
1542 | struct xfrm_mgr *km; | |
1543 | struct xfrm_policy *pol = NULL; | |
1544 | ||
1545 | if (optlen <= 0 || optlen > PAGE_SIZE) | |
1546 | return -EMSGSIZE; | |
1547 | ||
1548 | data = kmalloc(optlen, GFP_KERNEL); | |
1549 | if (!data) | |
1550 | return -ENOMEM; | |
1551 | ||
1552 | err = -EFAULT; | |
1553 | if (copy_from_user(data, optval, optlen)) | |
1554 | goto out; | |
1555 | ||
1556 | err = -EINVAL; | |
1557 | read_lock(&xfrm_km_lock); | |
1558 | list_for_each_entry(km, &xfrm_km_list, list) { | |
cb969f07 | 1559 | pol = km->compile_policy(sk, optname, data, |
1da177e4 LT |
1560 | optlen, &err); |
1561 | if (err >= 0) | |
1562 | break; | |
1563 | } | |
1564 | read_unlock(&xfrm_km_lock); | |
1565 | ||
1566 | if (err >= 0) { | |
1567 | xfrm_sk_policy_insert(sk, err, pol); | |
1568 | xfrm_pol_put(pol); | |
1569 | err = 0; | |
1570 | } | |
1571 | ||
1572 | out: | |
1573 | kfree(data); | |
1574 | return err; | |
1575 | } | |
1576 | EXPORT_SYMBOL(xfrm_user_policy); | |
1577 | ||
1578 | int xfrm_register_km(struct xfrm_mgr *km) | |
1579 | { | |
1580 | write_lock_bh(&xfrm_km_lock); | |
1581 | list_add_tail(&km->list, &xfrm_km_list); | |
1582 | write_unlock_bh(&xfrm_km_lock); | |
1583 | return 0; | |
1584 | } | |
1585 | EXPORT_SYMBOL(xfrm_register_km); | |
1586 | ||
1587 | int xfrm_unregister_km(struct xfrm_mgr *km) | |
1588 | { | |
1589 | write_lock_bh(&xfrm_km_lock); | |
1590 | list_del(&km->list); | |
1591 | write_unlock_bh(&xfrm_km_lock); | |
1592 | return 0; | |
1593 | } | |
1594 | EXPORT_SYMBOL(xfrm_unregister_km); | |
1595 | ||
1596 | int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo) | |
1597 | { | |
1598 | int err = 0; | |
1599 | if (unlikely(afinfo == NULL)) | |
1600 | return -EINVAL; | |
1601 | if (unlikely(afinfo->family >= NPROTO)) | |
1602 | return -EAFNOSUPPORT; | |
f3111502 | 1603 | write_lock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1604 | if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL)) |
1605 | err = -ENOBUFS; | |
edcd5821 | 1606 | else |
1da177e4 | 1607 | xfrm_state_afinfo[afinfo->family] = afinfo; |
f3111502 | 1608 | write_unlock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1609 | return err; |
1610 | } | |
1611 | EXPORT_SYMBOL(xfrm_state_register_afinfo); | |
1612 | ||
1613 | int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo) | |
1614 | { | |
1615 | int err = 0; | |
1616 | if (unlikely(afinfo == NULL)) | |
1617 | return -EINVAL; | |
1618 | if (unlikely(afinfo->family >= NPROTO)) | |
1619 | return -EAFNOSUPPORT; | |
f3111502 | 1620 | write_lock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1621 | if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) { |
1622 | if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo)) | |
1623 | err = -EINVAL; | |
edcd5821 | 1624 | else |
1da177e4 | 1625 | xfrm_state_afinfo[afinfo->family] = NULL; |
1da177e4 | 1626 | } |
f3111502 | 1627 | write_unlock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1628 | return err; |
1629 | } | |
1630 | EXPORT_SYMBOL(xfrm_state_unregister_afinfo); | |
1631 | ||
cdca7265 | 1632 | struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family) |
1da177e4 LT |
1633 | { |
1634 | struct xfrm_state_afinfo *afinfo; | |
1635 | if (unlikely(family >= NPROTO)) | |
1636 | return NULL; | |
1637 | read_lock(&xfrm_state_afinfo_lock); | |
1638 | afinfo = xfrm_state_afinfo[family]; | |
546be240 HX |
1639 | if (unlikely(!afinfo)) |
1640 | read_unlock(&xfrm_state_afinfo_lock); | |
1da177e4 LT |
1641 | return afinfo; |
1642 | } | |
1643 | ||
cdca7265 | 1644 | void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo) |
1da177e4 | 1645 | { |
546be240 | 1646 | read_unlock(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1647 | } |
1648 | ||
cdca7265 MK |
1649 | EXPORT_SYMBOL(xfrm_state_get_afinfo); |
1650 | EXPORT_SYMBOL(xfrm_state_put_afinfo); | |
1651 | ||
1da177e4 LT |
1652 | /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */ |
1653 | void xfrm_state_delete_tunnel(struct xfrm_state *x) | |
1654 | { | |
1655 | if (x->tunnel) { | |
1656 | struct xfrm_state *t = x->tunnel; | |
1657 | ||
1658 | if (atomic_read(&t->tunnel_users) == 2) | |
1659 | xfrm_state_delete(t); | |
1660 | atomic_dec(&t->tunnel_users); | |
1661 | xfrm_state_put(t); | |
1662 | x->tunnel = NULL; | |
1663 | } | |
1664 | } | |
1665 | EXPORT_SYMBOL(xfrm_state_delete_tunnel); | |
1666 | ||
80b30c10 HX |
1667 | /* |
1668 | * This function is NOT optimal. For example, with ESP it will give an | |
1669 | * MTU that's usually two bytes short of being optimal. However, it will | |
1670 | * usually give an answer that's a multiple of 4 provided the input is | |
1671 | * also a multiple of 4. | |
1672 | */ | |
1da177e4 LT |
1673 | int xfrm_state_mtu(struct xfrm_state *x, int mtu) |
1674 | { | |
1675 | int res = mtu; | |
1676 | ||
1677 | res -= x->props.header_len; | |
1678 | ||
1679 | for (;;) { | |
1680 | int m = res; | |
1681 | ||
1682 | if (m < 68) | |
1683 | return 68; | |
1684 | ||
1685 | spin_lock_bh(&x->lock); | |
1686 | if (x->km.state == XFRM_STATE_VALID && | |
1687 | x->type && x->type->get_max_size) | |
1688 | m = x->type->get_max_size(x, m); | |
1689 | else | |
1690 | m += x->props.header_len; | |
1691 | spin_unlock_bh(&x->lock); | |
1692 | ||
1693 | if (m <= mtu) | |
1694 | break; | |
1695 | res -= (m - mtu); | |
1696 | } | |
1697 | ||
1698 | return res; | |
1699 | } | |
1700 | ||
72cb6962 HX |
1701 | int xfrm_init_state(struct xfrm_state *x) |
1702 | { | |
d094cd83 HX |
1703 | struct xfrm_state_afinfo *afinfo; |
1704 | int family = x->props.family; | |
72cb6962 HX |
1705 | int err; |
1706 | ||
d094cd83 HX |
1707 | err = -EAFNOSUPPORT; |
1708 | afinfo = xfrm_state_get_afinfo(family); | |
1709 | if (!afinfo) | |
1710 | goto error; | |
1711 | ||
1712 | err = 0; | |
1713 | if (afinfo->init_flags) | |
1714 | err = afinfo->init_flags(x); | |
1715 | ||
1716 | xfrm_state_put_afinfo(afinfo); | |
1717 | ||
1718 | if (err) | |
1719 | goto error; | |
1720 | ||
1721 | err = -EPROTONOSUPPORT; | |
1722 | x->type = xfrm_get_type(x->id.proto, family); | |
72cb6962 HX |
1723 | if (x->type == NULL) |
1724 | goto error; | |
1725 | ||
1726 | err = x->type->init_state(x); | |
1727 | if (err) | |
1728 | goto error; | |
1729 | ||
b59f45d0 HX |
1730 | x->mode = xfrm_get_mode(x->props.mode, family); |
1731 | if (x->mode == NULL) | |
1732 | goto error; | |
1733 | ||
72cb6962 HX |
1734 | x->km.state = XFRM_STATE_VALID; |
1735 | ||
1736 | error: | |
1737 | return err; | |
1738 | } | |
1739 | ||
1740 | EXPORT_SYMBOL(xfrm_init_state); | |
a716c119 | 1741 | |
1da177e4 LT |
1742 | void __init xfrm_state_init(void) |
1743 | { | |
f034b5d4 DM |
1744 | unsigned int sz; |
1745 | ||
1746 | sz = sizeof(struct hlist_head) * 8; | |
1747 | ||
44e36b42 DM |
1748 | xfrm_state_bydst = xfrm_hash_alloc(sz); |
1749 | xfrm_state_bysrc = xfrm_hash_alloc(sz); | |
1750 | xfrm_state_byspi = xfrm_hash_alloc(sz); | |
f034b5d4 DM |
1751 | if (!xfrm_state_bydst || !xfrm_state_bysrc || !xfrm_state_byspi) |
1752 | panic("XFRM: Cannot allocate bydst/bysrc/byspi hashes."); | |
1753 | xfrm_state_hmask = ((sz / sizeof(struct hlist_head)) - 1); | |
1da177e4 | 1754 | |
c4028958 | 1755 | INIT_WORK(&xfrm_state_gc_work, xfrm_state_gc_task); |
1da177e4 LT |
1756 | } |
1757 |