Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
| 13 | * |
| 14 | */ |
| 15 | |
| 16 | #include <linux/workqueue.h> |
| 17 | #include <net/xfrm.h> |
| 18 | #include <linux/pfkeyv2.h> |
| 19 | #include <linux/ipsec.h> |
| 20 | #include <linux/module.h> |
| 21 | #include <asm/uaccess.h> |
| 22 | |
| 23 | /* Each xfrm_state may be linked to two tables: |
| 24 | |
| 25 | 1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl) |
| 26 | 2. Hash table by daddr to find what SAs exist for given |
| 27 | destination/tunnel endpoint. (output) |
| 28 | */ |
| 29 | |
| 30 | static DEFINE_SPINLOCK(xfrm_state_lock); |
| 31 | |
| 32 | /* Hash table to find appropriate SA towards given target (endpoint |
| 33 | * of tunnel or destination of transport mode) allowed by selector. |
| 34 | * |
| 35 | * Main use is finding SA after policy selected tunnel or transport mode. |
| 36 | * Also, it can be used by ah/esp icmp error handler to find offending SA. |
| 37 | */ |
| 38 | static struct list_head xfrm_state_bydst[XFRM_DST_HSIZE]; |
| 39 | static struct list_head xfrm_state_byspi[XFRM_DST_HSIZE]; |
| 40 | |
| 41 | DECLARE_WAIT_QUEUE_HEAD(km_waitq); |
| 42 | EXPORT_SYMBOL(km_waitq); |
| 43 | |
| 44 | static DEFINE_RWLOCK(xfrm_state_afinfo_lock); |
| 45 | static struct xfrm_state_afinfo *xfrm_state_afinfo[NPROTO]; |
| 46 | |
| 47 | static struct work_struct xfrm_state_gc_work; |
| 48 | static struct list_head xfrm_state_gc_list = LIST_HEAD_INIT(xfrm_state_gc_list); |
| 49 | static DEFINE_SPINLOCK(xfrm_state_gc_lock); |
| 50 | |
| 51 | static int xfrm_state_gc_flush_bundles; |
| 52 | |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 53 | static int __xfrm_state_delete(struct xfrm_state *x); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | |
| 55 | static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family); |
| 56 | static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo); |
| 57 | |
| 58 | static int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); |
| 59 | static void km_state_expired(struct xfrm_state *x, int hard); |
| 60 | |
| 61 | static void xfrm_state_gc_destroy(struct xfrm_state *x) |
| 62 | { |
| 63 | if (del_timer(&x->timer)) |
| 64 | BUG(); |
Jesper Juhl | a51482b | 2005-11-08 09:41:34 -0800 | [diff] [blame] | 65 | kfree(x->aalg); |
| 66 | kfree(x->ealg); |
| 67 | kfree(x->calg); |
| 68 | kfree(x->encap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | if (x->type) { |
| 70 | x->type->destructor(x); |
| 71 | xfrm_put_type(x->type); |
| 72 | } |
| 73 | kfree(x); |
| 74 | } |
| 75 | |
| 76 | static void xfrm_state_gc_task(void *data) |
| 77 | { |
| 78 | struct xfrm_state *x; |
| 79 | struct list_head *entry, *tmp; |
| 80 | struct list_head gc_list = LIST_HEAD_INIT(gc_list); |
| 81 | |
| 82 | if (xfrm_state_gc_flush_bundles) { |
| 83 | xfrm_state_gc_flush_bundles = 0; |
| 84 | xfrm_flush_bundles(); |
| 85 | } |
| 86 | |
| 87 | spin_lock_bh(&xfrm_state_gc_lock); |
| 88 | list_splice_init(&xfrm_state_gc_list, &gc_list); |
| 89 | spin_unlock_bh(&xfrm_state_gc_lock); |
| 90 | |
| 91 | list_for_each_safe(entry, tmp, &gc_list) { |
| 92 | x = list_entry(entry, struct xfrm_state, bydst); |
| 93 | xfrm_state_gc_destroy(x); |
| 94 | } |
| 95 | wake_up(&km_waitq); |
| 96 | } |
| 97 | |
| 98 | static inline unsigned long make_jiffies(long secs) |
| 99 | { |
| 100 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) |
| 101 | return MAX_SCHEDULE_TIMEOUT-1; |
| 102 | else |
| 103 | return secs*HZ; |
| 104 | } |
| 105 | |
| 106 | static void xfrm_timer_handler(unsigned long data) |
| 107 | { |
| 108 | struct xfrm_state *x = (struct xfrm_state*)data; |
| 109 | unsigned long now = (unsigned long)xtime.tv_sec; |
| 110 | long next = LONG_MAX; |
| 111 | int warn = 0; |
| 112 | |
| 113 | spin_lock(&x->lock); |
| 114 | if (x->km.state == XFRM_STATE_DEAD) |
| 115 | goto out; |
| 116 | if (x->km.state == XFRM_STATE_EXPIRED) |
| 117 | goto expired; |
| 118 | if (x->lft.hard_add_expires_seconds) { |
| 119 | long tmo = x->lft.hard_add_expires_seconds + |
| 120 | x->curlft.add_time - now; |
| 121 | if (tmo <= 0) |
| 122 | goto expired; |
| 123 | if (tmo < next) |
| 124 | next = tmo; |
| 125 | } |
| 126 | if (x->lft.hard_use_expires_seconds) { |
| 127 | long tmo = x->lft.hard_use_expires_seconds + |
| 128 | (x->curlft.use_time ? : now) - now; |
| 129 | if (tmo <= 0) |
| 130 | goto expired; |
| 131 | if (tmo < next) |
| 132 | next = tmo; |
| 133 | } |
| 134 | if (x->km.dying) |
| 135 | goto resched; |
| 136 | if (x->lft.soft_add_expires_seconds) { |
| 137 | long tmo = x->lft.soft_add_expires_seconds + |
| 138 | x->curlft.add_time - now; |
| 139 | if (tmo <= 0) |
| 140 | warn = 1; |
| 141 | else if (tmo < next) |
| 142 | next = tmo; |
| 143 | } |
| 144 | if (x->lft.soft_use_expires_seconds) { |
| 145 | long tmo = x->lft.soft_use_expires_seconds + |
| 146 | (x->curlft.use_time ? : now) - now; |
| 147 | if (tmo <= 0) |
| 148 | warn = 1; |
| 149 | else if (tmo < next) |
| 150 | next = tmo; |
| 151 | } |
| 152 | |
Herbert Xu | 4666faa | 2005-06-18 22:43:22 -0700 | [diff] [blame] | 153 | x->km.dying = warn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | if (warn) |
| 155 | km_state_expired(x, 0); |
| 156 | resched: |
| 157 | if (next != LONG_MAX && |
| 158 | !mod_timer(&x->timer, jiffies + make_jiffies(next))) |
| 159 | xfrm_state_hold(x); |
| 160 | goto out; |
| 161 | |
| 162 | expired: |
| 163 | if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) { |
| 164 | x->km.state = XFRM_STATE_EXPIRED; |
| 165 | wake_up(&km_waitq); |
| 166 | next = 2; |
| 167 | goto resched; |
| 168 | } |
Herbert Xu | 4666faa | 2005-06-18 22:43:22 -0700 | [diff] [blame] | 169 | if (!__xfrm_state_delete(x) && x->id.spi) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | km_state_expired(x, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | |
| 172 | out: |
| 173 | spin_unlock(&x->lock); |
| 174 | xfrm_state_put(x); |
| 175 | } |
| 176 | |
| 177 | struct xfrm_state *xfrm_state_alloc(void) |
| 178 | { |
| 179 | struct xfrm_state *x; |
| 180 | |
| 181 | x = kmalloc(sizeof(struct xfrm_state), GFP_ATOMIC); |
| 182 | |
| 183 | if (x) { |
| 184 | memset(x, 0, sizeof(struct xfrm_state)); |
| 185 | atomic_set(&x->refcnt, 1); |
| 186 | atomic_set(&x->tunnel_users, 0); |
| 187 | INIT_LIST_HEAD(&x->bydst); |
| 188 | INIT_LIST_HEAD(&x->byspi); |
| 189 | init_timer(&x->timer); |
| 190 | x->timer.function = xfrm_timer_handler; |
| 191 | x->timer.data = (unsigned long)x; |
| 192 | x->curlft.add_time = (unsigned long)xtime.tv_sec; |
| 193 | x->lft.soft_byte_limit = XFRM_INF; |
| 194 | x->lft.soft_packet_limit = XFRM_INF; |
| 195 | x->lft.hard_byte_limit = XFRM_INF; |
| 196 | x->lft.hard_packet_limit = XFRM_INF; |
| 197 | spin_lock_init(&x->lock); |
| 198 | } |
| 199 | return x; |
| 200 | } |
| 201 | EXPORT_SYMBOL(xfrm_state_alloc); |
| 202 | |
| 203 | void __xfrm_state_destroy(struct xfrm_state *x) |
| 204 | { |
| 205 | BUG_TRAP(x->km.state == XFRM_STATE_DEAD); |
| 206 | |
| 207 | spin_lock_bh(&xfrm_state_gc_lock); |
| 208 | list_add(&x->bydst, &xfrm_state_gc_list); |
| 209 | spin_unlock_bh(&xfrm_state_gc_lock); |
| 210 | schedule_work(&xfrm_state_gc_work); |
| 211 | } |
| 212 | EXPORT_SYMBOL(__xfrm_state_destroy); |
| 213 | |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 214 | static int __xfrm_state_delete(struct xfrm_state *x) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | { |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 216 | int err = -ESRCH; |
| 217 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | if (x->km.state != XFRM_STATE_DEAD) { |
| 219 | x->km.state = XFRM_STATE_DEAD; |
| 220 | spin_lock(&xfrm_state_lock); |
| 221 | list_del(&x->bydst); |
| 222 | atomic_dec(&x->refcnt); |
| 223 | if (x->id.spi) { |
| 224 | list_del(&x->byspi); |
| 225 | atomic_dec(&x->refcnt); |
| 226 | } |
| 227 | spin_unlock(&xfrm_state_lock); |
| 228 | if (del_timer(&x->timer)) |
| 229 | atomic_dec(&x->refcnt); |
| 230 | |
| 231 | /* The number two in this test is the reference |
| 232 | * mentioned in the comment below plus the reference |
| 233 | * our caller holds. A larger value means that |
| 234 | * there are DSTs attached to this xfrm_state. |
| 235 | */ |
| 236 | if (atomic_read(&x->refcnt) > 2) { |
| 237 | xfrm_state_gc_flush_bundles = 1; |
| 238 | schedule_work(&xfrm_state_gc_work); |
| 239 | } |
| 240 | |
| 241 | /* All xfrm_state objects are created by xfrm_state_alloc. |
| 242 | * The xfrm_state_alloc call gives a reference, and that |
| 243 | * is what we are dropping here. |
| 244 | */ |
| 245 | atomic_dec(&x->refcnt); |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 246 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | } |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 248 | |
| 249 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | } |
| 251 | |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 252 | int xfrm_state_delete(struct xfrm_state *x) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | { |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 254 | int err; |
| 255 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | spin_lock_bh(&x->lock); |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 257 | err = __xfrm_state_delete(x); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | spin_unlock_bh(&x->lock); |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 259 | |
| 260 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | } |
| 262 | EXPORT_SYMBOL(xfrm_state_delete); |
| 263 | |
| 264 | void xfrm_state_flush(u8 proto) |
| 265 | { |
| 266 | int i; |
| 267 | struct xfrm_state *x; |
| 268 | |
| 269 | spin_lock_bh(&xfrm_state_lock); |
| 270 | for (i = 0; i < XFRM_DST_HSIZE; i++) { |
| 271 | restart: |
| 272 | list_for_each_entry(x, xfrm_state_bydst+i, bydst) { |
| 273 | if (!xfrm_state_kern(x) && |
| 274 | (proto == IPSEC_PROTO_ANY || x->id.proto == proto)) { |
| 275 | xfrm_state_hold(x); |
| 276 | spin_unlock_bh(&xfrm_state_lock); |
| 277 | |
| 278 | xfrm_state_delete(x); |
| 279 | xfrm_state_put(x); |
| 280 | |
| 281 | spin_lock_bh(&xfrm_state_lock); |
| 282 | goto restart; |
| 283 | } |
| 284 | } |
| 285 | } |
| 286 | spin_unlock_bh(&xfrm_state_lock); |
| 287 | wake_up(&km_waitq); |
| 288 | } |
| 289 | EXPORT_SYMBOL(xfrm_state_flush); |
| 290 | |
| 291 | static int |
| 292 | xfrm_init_tempsel(struct xfrm_state *x, struct flowi *fl, |
| 293 | struct xfrm_tmpl *tmpl, |
| 294 | xfrm_address_t *daddr, xfrm_address_t *saddr, |
| 295 | unsigned short family) |
| 296 | { |
| 297 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); |
| 298 | if (!afinfo) |
| 299 | return -1; |
| 300 | afinfo->init_tempsel(x, fl, tmpl, daddr, saddr); |
| 301 | xfrm_state_put_afinfo(afinfo); |
| 302 | return 0; |
| 303 | } |
| 304 | |
| 305 | struct xfrm_state * |
| 306 | xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, |
| 307 | struct flowi *fl, struct xfrm_tmpl *tmpl, |
| 308 | struct xfrm_policy *pol, int *err, |
| 309 | unsigned short family) |
| 310 | { |
| 311 | unsigned h = xfrm_dst_hash(daddr, family); |
| 312 | struct xfrm_state *x, *x0; |
| 313 | int acquire_in_progress = 0; |
| 314 | int error = 0; |
| 315 | struct xfrm_state *best = NULL; |
| 316 | struct xfrm_state_afinfo *afinfo; |
| 317 | |
| 318 | afinfo = xfrm_state_get_afinfo(family); |
| 319 | if (afinfo == NULL) { |
| 320 | *err = -EAFNOSUPPORT; |
| 321 | return NULL; |
| 322 | } |
| 323 | |
| 324 | spin_lock_bh(&xfrm_state_lock); |
| 325 | list_for_each_entry(x, xfrm_state_bydst+h, bydst) { |
| 326 | if (x->props.family == family && |
| 327 | x->props.reqid == tmpl->reqid && |
| 328 | xfrm_state_addr_check(x, daddr, saddr, family) && |
| 329 | tmpl->mode == x->props.mode && |
| 330 | tmpl->id.proto == x->id.proto && |
| 331 | (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) { |
| 332 | /* Resolution logic: |
| 333 | 1. There is a valid state with matching selector. |
| 334 | Done. |
| 335 | 2. Valid state with inappropriate selector. Skip. |
| 336 | |
| 337 | Entering area of "sysdeps". |
| 338 | |
| 339 | 3. If state is not valid, selector is temporary, |
| 340 | it selects only session which triggered |
| 341 | previous resolution. Key manager will do |
| 342 | something to install a state with proper |
| 343 | selector. |
| 344 | */ |
| 345 | if (x->km.state == XFRM_STATE_VALID) { |
| 346 | if (!xfrm_selector_match(&x->sel, fl, family)) |
| 347 | continue; |
| 348 | if (!best || |
| 349 | best->km.dying > x->km.dying || |
| 350 | (best->km.dying == x->km.dying && |
| 351 | best->curlft.add_time < x->curlft.add_time)) |
| 352 | best = x; |
| 353 | } else if (x->km.state == XFRM_STATE_ACQ) { |
| 354 | acquire_in_progress = 1; |
| 355 | } else if (x->km.state == XFRM_STATE_ERROR || |
| 356 | x->km.state == XFRM_STATE_EXPIRED) { |
| 357 | if (xfrm_selector_match(&x->sel, fl, family)) |
| 358 | error = -ESRCH; |
| 359 | } |
| 360 | } |
| 361 | } |
| 362 | |
| 363 | x = best; |
| 364 | if (!x && !error && !acquire_in_progress) { |
Patrick McHardy | 5c5d281 | 2005-04-21 20:12:32 -0700 | [diff] [blame] | 365 | if (tmpl->id.spi && |
| 366 | (x0 = afinfo->state_lookup(daddr, tmpl->id.spi, |
| 367 | tmpl->id.proto)) != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | xfrm_state_put(x0); |
| 369 | error = -EEXIST; |
| 370 | goto out; |
| 371 | } |
| 372 | x = xfrm_state_alloc(); |
| 373 | if (x == NULL) { |
| 374 | error = -ENOMEM; |
| 375 | goto out; |
| 376 | } |
| 377 | /* Initialize temporary selector matching only |
| 378 | * to current session. */ |
| 379 | xfrm_init_tempsel(x, fl, tmpl, daddr, saddr, family); |
| 380 | |
| 381 | if (km_query(x, tmpl, pol) == 0) { |
| 382 | x->km.state = XFRM_STATE_ACQ; |
| 383 | list_add_tail(&x->bydst, xfrm_state_bydst+h); |
| 384 | xfrm_state_hold(x); |
| 385 | if (x->id.spi) { |
| 386 | h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, family); |
| 387 | list_add(&x->byspi, xfrm_state_byspi+h); |
| 388 | xfrm_state_hold(x); |
| 389 | } |
| 390 | x->lft.hard_add_expires_seconds = XFRM_ACQ_EXPIRES; |
| 391 | xfrm_state_hold(x); |
| 392 | x->timer.expires = jiffies + XFRM_ACQ_EXPIRES*HZ; |
| 393 | add_timer(&x->timer); |
| 394 | } else { |
| 395 | x->km.state = XFRM_STATE_DEAD; |
| 396 | xfrm_state_put(x); |
| 397 | x = NULL; |
| 398 | error = -ESRCH; |
| 399 | } |
| 400 | } |
| 401 | out: |
| 402 | if (x) |
| 403 | xfrm_state_hold(x); |
| 404 | else |
| 405 | *err = acquire_in_progress ? -EAGAIN : error; |
| 406 | spin_unlock_bh(&xfrm_state_lock); |
| 407 | xfrm_state_put_afinfo(afinfo); |
| 408 | return x; |
| 409 | } |
| 410 | |
| 411 | static void __xfrm_state_insert(struct xfrm_state *x) |
| 412 | { |
| 413 | unsigned h = xfrm_dst_hash(&x->id.daddr, x->props.family); |
| 414 | |
| 415 | list_add(&x->bydst, xfrm_state_bydst+h); |
| 416 | xfrm_state_hold(x); |
| 417 | |
| 418 | h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, x->props.family); |
| 419 | |
| 420 | list_add(&x->byspi, xfrm_state_byspi+h); |
| 421 | xfrm_state_hold(x); |
| 422 | |
| 423 | if (!mod_timer(&x->timer, jiffies + HZ)) |
| 424 | xfrm_state_hold(x); |
| 425 | |
| 426 | wake_up(&km_waitq); |
| 427 | } |
| 428 | |
| 429 | void xfrm_state_insert(struct xfrm_state *x) |
| 430 | { |
| 431 | spin_lock_bh(&xfrm_state_lock); |
| 432 | __xfrm_state_insert(x); |
| 433 | spin_unlock_bh(&xfrm_state_lock); |
| 434 | } |
| 435 | EXPORT_SYMBOL(xfrm_state_insert); |
| 436 | |
| 437 | static struct xfrm_state *__xfrm_find_acq_byseq(u32 seq); |
| 438 | |
| 439 | int xfrm_state_add(struct xfrm_state *x) |
| 440 | { |
| 441 | struct xfrm_state_afinfo *afinfo; |
| 442 | struct xfrm_state *x1; |
| 443 | int family; |
| 444 | int err; |
| 445 | |
| 446 | family = x->props.family; |
| 447 | afinfo = xfrm_state_get_afinfo(family); |
| 448 | if (unlikely(afinfo == NULL)) |
| 449 | return -EAFNOSUPPORT; |
| 450 | |
| 451 | spin_lock_bh(&xfrm_state_lock); |
| 452 | |
| 453 | x1 = afinfo->state_lookup(&x->id.daddr, x->id.spi, x->id.proto); |
| 454 | if (x1) { |
| 455 | xfrm_state_put(x1); |
| 456 | x1 = NULL; |
| 457 | err = -EEXIST; |
| 458 | goto out; |
| 459 | } |
| 460 | |
| 461 | if (x->km.seq) { |
| 462 | x1 = __xfrm_find_acq_byseq(x->km.seq); |
| 463 | if (x1 && xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family)) { |
| 464 | xfrm_state_put(x1); |
| 465 | x1 = NULL; |
| 466 | } |
| 467 | } |
| 468 | |
| 469 | if (!x1) |
| 470 | x1 = afinfo->find_acq( |
| 471 | x->props.mode, x->props.reqid, x->id.proto, |
| 472 | &x->id.daddr, &x->props.saddr, 0); |
| 473 | |
| 474 | __xfrm_state_insert(x); |
| 475 | err = 0; |
| 476 | |
| 477 | out: |
| 478 | spin_unlock_bh(&xfrm_state_lock); |
| 479 | xfrm_state_put_afinfo(afinfo); |
| 480 | |
| 481 | if (x1) { |
| 482 | xfrm_state_delete(x1); |
| 483 | xfrm_state_put(x1); |
| 484 | } |
| 485 | |
| 486 | return err; |
| 487 | } |
| 488 | EXPORT_SYMBOL(xfrm_state_add); |
| 489 | |
| 490 | int xfrm_state_update(struct xfrm_state *x) |
| 491 | { |
| 492 | struct xfrm_state_afinfo *afinfo; |
| 493 | struct xfrm_state *x1; |
| 494 | int err; |
| 495 | |
| 496 | afinfo = xfrm_state_get_afinfo(x->props.family); |
| 497 | if (unlikely(afinfo == NULL)) |
| 498 | return -EAFNOSUPPORT; |
| 499 | |
| 500 | spin_lock_bh(&xfrm_state_lock); |
| 501 | x1 = afinfo->state_lookup(&x->id.daddr, x->id.spi, x->id.proto); |
| 502 | |
| 503 | err = -ESRCH; |
| 504 | if (!x1) |
| 505 | goto out; |
| 506 | |
| 507 | if (xfrm_state_kern(x1)) { |
| 508 | xfrm_state_put(x1); |
| 509 | err = -EEXIST; |
| 510 | goto out; |
| 511 | } |
| 512 | |
| 513 | if (x1->km.state == XFRM_STATE_ACQ) { |
| 514 | __xfrm_state_insert(x); |
| 515 | x = NULL; |
| 516 | } |
| 517 | err = 0; |
| 518 | |
| 519 | out: |
| 520 | spin_unlock_bh(&xfrm_state_lock); |
| 521 | xfrm_state_put_afinfo(afinfo); |
| 522 | |
| 523 | if (err) |
| 524 | return err; |
| 525 | |
| 526 | if (!x) { |
| 527 | xfrm_state_delete(x1); |
| 528 | xfrm_state_put(x1); |
| 529 | return 0; |
| 530 | } |
| 531 | |
| 532 | err = -EINVAL; |
| 533 | spin_lock_bh(&x1->lock); |
| 534 | if (likely(x1->km.state == XFRM_STATE_VALID)) { |
| 535 | if (x->encap && x1->encap) |
| 536 | memcpy(x1->encap, x->encap, sizeof(*x1->encap)); |
| 537 | memcpy(&x1->lft, &x->lft, sizeof(x1->lft)); |
| 538 | x1->km.dying = 0; |
| 539 | |
| 540 | if (!mod_timer(&x1->timer, jiffies + HZ)) |
| 541 | xfrm_state_hold(x1); |
| 542 | if (x1->curlft.use_time) |
| 543 | xfrm_state_check_expire(x1); |
| 544 | |
| 545 | err = 0; |
| 546 | } |
| 547 | spin_unlock_bh(&x1->lock); |
| 548 | |
| 549 | xfrm_state_put(x1); |
| 550 | |
| 551 | return err; |
| 552 | } |
| 553 | EXPORT_SYMBOL(xfrm_state_update); |
| 554 | |
| 555 | int xfrm_state_check_expire(struct xfrm_state *x) |
| 556 | { |
| 557 | if (!x->curlft.use_time) |
| 558 | x->curlft.use_time = (unsigned long)xtime.tv_sec; |
| 559 | |
| 560 | if (x->km.state != XFRM_STATE_VALID) |
| 561 | return -EINVAL; |
| 562 | |
| 563 | if (x->curlft.bytes >= x->lft.hard_byte_limit || |
| 564 | x->curlft.packets >= x->lft.hard_packet_limit) { |
Herbert Xu | 4666faa | 2005-06-18 22:43:22 -0700 | [diff] [blame] | 565 | x->km.state = XFRM_STATE_EXPIRED; |
| 566 | if (!mod_timer(&x->timer, jiffies)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | xfrm_state_hold(x); |
| 568 | return -EINVAL; |
| 569 | } |
| 570 | |
| 571 | if (!x->km.dying && |
| 572 | (x->curlft.bytes >= x->lft.soft_byte_limit || |
Herbert Xu | 4666faa | 2005-06-18 22:43:22 -0700 | [diff] [blame] | 573 | x->curlft.packets >= x->lft.soft_packet_limit)) { |
| 574 | x->km.dying = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | km_state_expired(x, 0); |
Herbert Xu | 4666faa | 2005-06-18 22:43:22 -0700 | [diff] [blame] | 576 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | return 0; |
| 578 | } |
| 579 | EXPORT_SYMBOL(xfrm_state_check_expire); |
| 580 | |
| 581 | static int xfrm_state_check_space(struct xfrm_state *x, struct sk_buff *skb) |
| 582 | { |
| 583 | int nhead = x->props.header_len + LL_RESERVED_SPACE(skb->dst->dev) |
| 584 | - skb_headroom(skb); |
| 585 | |
| 586 | if (nhead > 0) |
| 587 | return pskb_expand_head(skb, nhead, 0, GFP_ATOMIC); |
| 588 | |
| 589 | /* Check tail too... */ |
| 590 | return 0; |
| 591 | } |
| 592 | |
| 593 | int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb) |
| 594 | { |
| 595 | int err = xfrm_state_check_expire(x); |
| 596 | if (err < 0) |
| 597 | goto err; |
| 598 | err = xfrm_state_check_space(x, skb); |
| 599 | err: |
| 600 | return err; |
| 601 | } |
| 602 | EXPORT_SYMBOL(xfrm_state_check); |
| 603 | |
| 604 | struct xfrm_state * |
| 605 | xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, |
| 606 | unsigned short family) |
| 607 | { |
| 608 | struct xfrm_state *x; |
| 609 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); |
| 610 | if (!afinfo) |
| 611 | return NULL; |
| 612 | |
| 613 | spin_lock_bh(&xfrm_state_lock); |
| 614 | x = afinfo->state_lookup(daddr, spi, proto); |
| 615 | spin_unlock_bh(&xfrm_state_lock); |
| 616 | xfrm_state_put_afinfo(afinfo); |
| 617 | return x; |
| 618 | } |
| 619 | EXPORT_SYMBOL(xfrm_state_lookup); |
| 620 | |
| 621 | struct xfrm_state * |
| 622 | xfrm_find_acq(u8 mode, u32 reqid, u8 proto, |
| 623 | xfrm_address_t *daddr, xfrm_address_t *saddr, |
| 624 | int create, unsigned short family) |
| 625 | { |
| 626 | struct xfrm_state *x; |
| 627 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); |
| 628 | if (!afinfo) |
| 629 | return NULL; |
| 630 | |
| 631 | spin_lock_bh(&xfrm_state_lock); |
| 632 | x = afinfo->find_acq(mode, reqid, proto, daddr, saddr, create); |
| 633 | spin_unlock_bh(&xfrm_state_lock); |
| 634 | xfrm_state_put_afinfo(afinfo); |
| 635 | return x; |
| 636 | } |
| 637 | EXPORT_SYMBOL(xfrm_find_acq); |
| 638 | |
| 639 | /* Silly enough, but I'm lazy to build resolution list */ |
| 640 | |
| 641 | static struct xfrm_state *__xfrm_find_acq_byseq(u32 seq) |
| 642 | { |
| 643 | int i; |
| 644 | struct xfrm_state *x; |
| 645 | |
| 646 | for (i = 0; i < XFRM_DST_HSIZE; i++) { |
| 647 | list_for_each_entry(x, xfrm_state_bydst+i, bydst) { |
| 648 | if (x->km.seq == seq && x->km.state == XFRM_STATE_ACQ) { |
| 649 | xfrm_state_hold(x); |
| 650 | return x; |
| 651 | } |
| 652 | } |
| 653 | } |
| 654 | return NULL; |
| 655 | } |
| 656 | |
| 657 | struct xfrm_state *xfrm_find_acq_byseq(u32 seq) |
| 658 | { |
| 659 | struct xfrm_state *x; |
| 660 | |
| 661 | spin_lock_bh(&xfrm_state_lock); |
| 662 | x = __xfrm_find_acq_byseq(seq); |
| 663 | spin_unlock_bh(&xfrm_state_lock); |
| 664 | return x; |
| 665 | } |
| 666 | EXPORT_SYMBOL(xfrm_find_acq_byseq); |
| 667 | |
| 668 | u32 xfrm_get_acqseq(void) |
| 669 | { |
| 670 | u32 res; |
| 671 | static u32 acqseq; |
| 672 | static DEFINE_SPINLOCK(acqseq_lock); |
| 673 | |
| 674 | spin_lock_bh(&acqseq_lock); |
| 675 | res = (++acqseq ? : ++acqseq); |
| 676 | spin_unlock_bh(&acqseq_lock); |
| 677 | return res; |
| 678 | } |
| 679 | EXPORT_SYMBOL(xfrm_get_acqseq); |
| 680 | |
| 681 | void |
| 682 | xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi) |
| 683 | { |
| 684 | u32 h; |
| 685 | struct xfrm_state *x0; |
| 686 | |
| 687 | if (x->id.spi) |
| 688 | return; |
| 689 | |
| 690 | if (minspi == maxspi) { |
| 691 | x0 = xfrm_state_lookup(&x->id.daddr, minspi, x->id.proto, x->props.family); |
| 692 | if (x0) { |
| 693 | xfrm_state_put(x0); |
| 694 | return; |
| 695 | } |
| 696 | x->id.spi = minspi; |
| 697 | } else { |
| 698 | u32 spi = 0; |
| 699 | minspi = ntohl(minspi); |
| 700 | maxspi = ntohl(maxspi); |
| 701 | for (h=0; h<maxspi-minspi+1; h++) { |
| 702 | spi = minspi + net_random()%(maxspi-minspi+1); |
| 703 | x0 = xfrm_state_lookup(&x->id.daddr, htonl(spi), x->id.proto, x->props.family); |
| 704 | if (x0 == NULL) { |
| 705 | x->id.spi = htonl(spi); |
| 706 | break; |
| 707 | } |
| 708 | xfrm_state_put(x0); |
| 709 | } |
| 710 | } |
| 711 | if (x->id.spi) { |
| 712 | spin_lock_bh(&xfrm_state_lock); |
| 713 | h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, x->props.family); |
| 714 | list_add(&x->byspi, xfrm_state_byspi+h); |
| 715 | xfrm_state_hold(x); |
| 716 | spin_unlock_bh(&xfrm_state_lock); |
| 717 | wake_up(&km_waitq); |
| 718 | } |
| 719 | } |
| 720 | EXPORT_SYMBOL(xfrm_alloc_spi); |
| 721 | |
| 722 | int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), |
| 723 | void *data) |
| 724 | { |
| 725 | int i; |
| 726 | struct xfrm_state *x; |
| 727 | int count = 0; |
| 728 | int err = 0; |
| 729 | |
| 730 | spin_lock_bh(&xfrm_state_lock); |
| 731 | for (i = 0; i < XFRM_DST_HSIZE; i++) { |
| 732 | list_for_each_entry(x, xfrm_state_bydst+i, bydst) { |
| 733 | if (proto == IPSEC_PROTO_ANY || x->id.proto == proto) |
| 734 | count++; |
| 735 | } |
| 736 | } |
| 737 | if (count == 0) { |
| 738 | err = -ENOENT; |
| 739 | goto out; |
| 740 | } |
| 741 | |
| 742 | for (i = 0; i < XFRM_DST_HSIZE; i++) { |
| 743 | list_for_each_entry(x, xfrm_state_bydst+i, bydst) { |
| 744 | if (proto != IPSEC_PROTO_ANY && x->id.proto != proto) |
| 745 | continue; |
| 746 | err = func(x, --count, data); |
| 747 | if (err) |
| 748 | goto out; |
| 749 | } |
| 750 | } |
| 751 | out: |
| 752 | spin_unlock_bh(&xfrm_state_lock); |
| 753 | return err; |
| 754 | } |
| 755 | EXPORT_SYMBOL(xfrm_state_walk); |
| 756 | |
| 757 | int xfrm_replay_check(struct xfrm_state *x, u32 seq) |
| 758 | { |
| 759 | u32 diff; |
| 760 | |
| 761 | seq = ntohl(seq); |
| 762 | |
| 763 | if (unlikely(seq == 0)) |
| 764 | return -EINVAL; |
| 765 | |
| 766 | if (likely(seq > x->replay.seq)) |
| 767 | return 0; |
| 768 | |
| 769 | diff = x->replay.seq - seq; |
| 770 | if (diff >= x->props.replay_window) { |
| 771 | x->stats.replay_window++; |
| 772 | return -EINVAL; |
| 773 | } |
| 774 | |
| 775 | if (x->replay.bitmap & (1U << diff)) { |
| 776 | x->stats.replay++; |
| 777 | return -EINVAL; |
| 778 | } |
| 779 | return 0; |
| 780 | } |
| 781 | EXPORT_SYMBOL(xfrm_replay_check); |
| 782 | |
| 783 | void xfrm_replay_advance(struct xfrm_state *x, u32 seq) |
| 784 | { |
| 785 | u32 diff; |
| 786 | |
| 787 | seq = ntohl(seq); |
| 788 | |
| 789 | if (seq > x->replay.seq) { |
| 790 | diff = seq - x->replay.seq; |
| 791 | if (diff < x->props.replay_window) |
| 792 | x->replay.bitmap = ((x->replay.bitmap) << diff) | 1; |
| 793 | else |
| 794 | x->replay.bitmap = 1; |
| 795 | x->replay.seq = seq; |
| 796 | } else { |
| 797 | diff = x->replay.seq - seq; |
| 798 | x->replay.bitmap |= (1U << diff); |
| 799 | } |
| 800 | } |
| 801 | EXPORT_SYMBOL(xfrm_replay_advance); |
| 802 | |
| 803 | static struct list_head xfrm_km_list = LIST_HEAD_INIT(xfrm_km_list); |
| 804 | static DEFINE_RWLOCK(xfrm_km_lock); |
| 805 | |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 806 | void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | { |
| 808 | struct xfrm_mgr *km; |
| 809 | |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 810 | read_lock(&xfrm_km_lock); |
| 811 | list_for_each_entry(km, &xfrm_km_list, list) |
| 812 | if (km->notify_policy) |
| 813 | km->notify_policy(xp, dir, c); |
| 814 | read_unlock(&xfrm_km_lock); |
| 815 | } |
| 816 | |
| 817 | void km_state_notify(struct xfrm_state *x, struct km_event *c) |
| 818 | { |
| 819 | struct xfrm_mgr *km; |
| 820 | read_lock(&xfrm_km_lock); |
| 821 | list_for_each_entry(km, &xfrm_km_list, list) |
| 822 | if (km->notify) |
| 823 | km->notify(x, c); |
| 824 | read_unlock(&xfrm_km_lock); |
| 825 | } |
| 826 | |
| 827 | EXPORT_SYMBOL(km_policy_notify); |
| 828 | EXPORT_SYMBOL(km_state_notify); |
| 829 | |
| 830 | static void km_state_expired(struct xfrm_state *x, int hard) |
| 831 | { |
| 832 | struct km_event c; |
| 833 | |
Herbert Xu | bf08867 | 2005-06-18 22:44:00 -0700 | [diff] [blame] | 834 | c.data.hard = hard; |
Herbert Xu | f60f6b8 | 2005-06-18 22:44:37 -0700 | [diff] [blame] | 835 | c.event = XFRM_MSG_EXPIRE; |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 836 | km_state_notify(x, &c); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | |
| 838 | if (hard) |
| 839 | wake_up(&km_waitq); |
| 840 | } |
| 841 | |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 842 | /* |
| 843 | * We send to all registered managers regardless of failure |
| 844 | * We are happy with one success |
| 845 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | static int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol) |
| 847 | { |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 848 | int err = -EINVAL, acqret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | struct xfrm_mgr *km; |
| 850 | |
| 851 | read_lock(&xfrm_km_lock); |
| 852 | list_for_each_entry(km, &xfrm_km_list, list) { |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 853 | acqret = km->acquire(x, t, pol, XFRM_POLICY_OUT); |
| 854 | if (!acqret) |
| 855 | err = acqret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | } |
| 857 | read_unlock(&xfrm_km_lock); |
| 858 | return err; |
| 859 | } |
| 860 | |
| 861 | int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport) |
| 862 | { |
| 863 | int err = -EINVAL; |
| 864 | struct xfrm_mgr *km; |
| 865 | |
| 866 | read_lock(&xfrm_km_lock); |
| 867 | list_for_each_entry(km, &xfrm_km_list, list) { |
| 868 | if (km->new_mapping) |
| 869 | err = km->new_mapping(x, ipaddr, sport); |
| 870 | if (!err) |
| 871 | break; |
| 872 | } |
| 873 | read_unlock(&xfrm_km_lock); |
| 874 | return err; |
| 875 | } |
| 876 | EXPORT_SYMBOL(km_new_mapping); |
| 877 | |
| 878 | void km_policy_expired(struct xfrm_policy *pol, int dir, int hard) |
| 879 | { |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 880 | struct km_event c; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | |
Herbert Xu | bf08867 | 2005-06-18 22:44:00 -0700 | [diff] [blame] | 882 | c.data.hard = hard; |
Herbert Xu | f60f6b8 | 2005-06-18 22:44:37 -0700 | [diff] [blame] | 883 | c.event = XFRM_MSG_POLEXPIRE; |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 884 | km_policy_notify(pol, dir, &c); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | |
| 886 | if (hard) |
| 887 | wake_up(&km_waitq); |
| 888 | } |
| 889 | |
| 890 | int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) |
| 891 | { |
| 892 | int err; |
| 893 | u8 *data; |
| 894 | struct xfrm_mgr *km; |
| 895 | struct xfrm_policy *pol = NULL; |
| 896 | |
| 897 | if (optlen <= 0 || optlen > PAGE_SIZE) |
| 898 | return -EMSGSIZE; |
| 899 | |
| 900 | data = kmalloc(optlen, GFP_KERNEL); |
| 901 | if (!data) |
| 902 | return -ENOMEM; |
| 903 | |
| 904 | err = -EFAULT; |
| 905 | if (copy_from_user(data, optval, optlen)) |
| 906 | goto out; |
| 907 | |
| 908 | err = -EINVAL; |
| 909 | read_lock(&xfrm_km_lock); |
| 910 | list_for_each_entry(km, &xfrm_km_list, list) { |
| 911 | pol = km->compile_policy(sk->sk_family, optname, data, |
| 912 | optlen, &err); |
| 913 | if (err >= 0) |
| 914 | break; |
| 915 | } |
| 916 | read_unlock(&xfrm_km_lock); |
| 917 | |
| 918 | if (err >= 0) { |
| 919 | xfrm_sk_policy_insert(sk, err, pol); |
| 920 | xfrm_pol_put(pol); |
| 921 | err = 0; |
| 922 | } |
| 923 | |
| 924 | out: |
| 925 | kfree(data); |
| 926 | return err; |
| 927 | } |
| 928 | EXPORT_SYMBOL(xfrm_user_policy); |
| 929 | |
| 930 | int xfrm_register_km(struct xfrm_mgr *km) |
| 931 | { |
| 932 | write_lock_bh(&xfrm_km_lock); |
| 933 | list_add_tail(&km->list, &xfrm_km_list); |
| 934 | write_unlock_bh(&xfrm_km_lock); |
| 935 | return 0; |
| 936 | } |
| 937 | EXPORT_SYMBOL(xfrm_register_km); |
| 938 | |
| 939 | int xfrm_unregister_km(struct xfrm_mgr *km) |
| 940 | { |
| 941 | write_lock_bh(&xfrm_km_lock); |
| 942 | list_del(&km->list); |
| 943 | write_unlock_bh(&xfrm_km_lock); |
| 944 | return 0; |
| 945 | } |
| 946 | EXPORT_SYMBOL(xfrm_unregister_km); |
| 947 | |
| 948 | int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo) |
| 949 | { |
| 950 | int err = 0; |
| 951 | if (unlikely(afinfo == NULL)) |
| 952 | return -EINVAL; |
| 953 | if (unlikely(afinfo->family >= NPROTO)) |
| 954 | return -EAFNOSUPPORT; |
| 955 | write_lock(&xfrm_state_afinfo_lock); |
| 956 | if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL)) |
| 957 | err = -ENOBUFS; |
| 958 | else { |
| 959 | afinfo->state_bydst = xfrm_state_bydst; |
| 960 | afinfo->state_byspi = xfrm_state_byspi; |
| 961 | xfrm_state_afinfo[afinfo->family] = afinfo; |
| 962 | } |
| 963 | write_unlock(&xfrm_state_afinfo_lock); |
| 964 | return err; |
| 965 | } |
| 966 | EXPORT_SYMBOL(xfrm_state_register_afinfo); |
| 967 | |
| 968 | int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo) |
| 969 | { |
| 970 | int err = 0; |
| 971 | if (unlikely(afinfo == NULL)) |
| 972 | return -EINVAL; |
| 973 | if (unlikely(afinfo->family >= NPROTO)) |
| 974 | return -EAFNOSUPPORT; |
| 975 | write_lock(&xfrm_state_afinfo_lock); |
| 976 | if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) { |
| 977 | if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo)) |
| 978 | err = -EINVAL; |
| 979 | else { |
| 980 | xfrm_state_afinfo[afinfo->family] = NULL; |
| 981 | afinfo->state_byspi = NULL; |
| 982 | afinfo->state_bydst = NULL; |
| 983 | } |
| 984 | } |
| 985 | write_unlock(&xfrm_state_afinfo_lock); |
| 986 | return err; |
| 987 | } |
| 988 | EXPORT_SYMBOL(xfrm_state_unregister_afinfo); |
| 989 | |
| 990 | static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family) |
| 991 | { |
| 992 | struct xfrm_state_afinfo *afinfo; |
| 993 | if (unlikely(family >= NPROTO)) |
| 994 | return NULL; |
| 995 | read_lock(&xfrm_state_afinfo_lock); |
| 996 | afinfo = xfrm_state_afinfo[family]; |
| 997 | if (likely(afinfo != NULL)) |
| 998 | read_lock(&afinfo->lock); |
| 999 | read_unlock(&xfrm_state_afinfo_lock); |
| 1000 | return afinfo; |
| 1001 | } |
| 1002 | |
| 1003 | static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo) |
| 1004 | { |
| 1005 | if (unlikely(afinfo == NULL)) |
| 1006 | return; |
| 1007 | read_unlock(&afinfo->lock); |
| 1008 | } |
| 1009 | |
| 1010 | /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */ |
| 1011 | void xfrm_state_delete_tunnel(struct xfrm_state *x) |
| 1012 | { |
| 1013 | if (x->tunnel) { |
| 1014 | struct xfrm_state *t = x->tunnel; |
| 1015 | |
| 1016 | if (atomic_read(&t->tunnel_users) == 2) |
| 1017 | xfrm_state_delete(t); |
| 1018 | atomic_dec(&t->tunnel_users); |
| 1019 | xfrm_state_put(t); |
| 1020 | x->tunnel = NULL; |
| 1021 | } |
| 1022 | } |
| 1023 | EXPORT_SYMBOL(xfrm_state_delete_tunnel); |
| 1024 | |
Herbert Xu | 80b30c1 | 2005-10-15 10:58:30 +1000 | [diff] [blame] | 1025 | /* |
| 1026 | * This function is NOT optimal. For example, with ESP it will give an |
| 1027 | * MTU that's usually two bytes short of being optimal. However, it will |
| 1028 | * usually give an answer that's a multiple of 4 provided the input is |
| 1029 | * also a multiple of 4. |
| 1030 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1031 | int xfrm_state_mtu(struct xfrm_state *x, int mtu) |
| 1032 | { |
| 1033 | int res = mtu; |
| 1034 | |
| 1035 | res -= x->props.header_len; |
| 1036 | |
| 1037 | for (;;) { |
| 1038 | int m = res; |
| 1039 | |
| 1040 | if (m < 68) |
| 1041 | return 68; |
| 1042 | |
| 1043 | spin_lock_bh(&x->lock); |
| 1044 | if (x->km.state == XFRM_STATE_VALID && |
| 1045 | x->type && x->type->get_max_size) |
| 1046 | m = x->type->get_max_size(x, m); |
| 1047 | else |
| 1048 | m += x->props.header_len; |
| 1049 | spin_unlock_bh(&x->lock); |
| 1050 | |
| 1051 | if (m <= mtu) |
| 1052 | break; |
| 1053 | res -= (m - mtu); |
| 1054 | } |
| 1055 | |
| 1056 | return res; |
| 1057 | } |
| 1058 | |
| 1059 | EXPORT_SYMBOL(xfrm_state_mtu); |
Herbert Xu | 72cb696 | 2005-06-20 13:18:08 -0700 | [diff] [blame] | 1060 | |
| 1061 | int xfrm_init_state(struct xfrm_state *x) |
| 1062 | { |
Herbert Xu | d094cd8 | 2005-06-20 13:19:41 -0700 | [diff] [blame] | 1063 | struct xfrm_state_afinfo *afinfo; |
| 1064 | int family = x->props.family; |
Herbert Xu | 72cb696 | 2005-06-20 13:18:08 -0700 | [diff] [blame] | 1065 | int err; |
| 1066 | |
Herbert Xu | d094cd8 | 2005-06-20 13:19:41 -0700 | [diff] [blame] | 1067 | err = -EAFNOSUPPORT; |
| 1068 | afinfo = xfrm_state_get_afinfo(family); |
| 1069 | if (!afinfo) |
| 1070 | goto error; |
| 1071 | |
| 1072 | err = 0; |
| 1073 | if (afinfo->init_flags) |
| 1074 | err = afinfo->init_flags(x); |
| 1075 | |
| 1076 | xfrm_state_put_afinfo(afinfo); |
| 1077 | |
| 1078 | if (err) |
| 1079 | goto error; |
| 1080 | |
| 1081 | err = -EPROTONOSUPPORT; |
| 1082 | x->type = xfrm_get_type(x->id.proto, family); |
Herbert Xu | 72cb696 | 2005-06-20 13:18:08 -0700 | [diff] [blame] | 1083 | if (x->type == NULL) |
| 1084 | goto error; |
| 1085 | |
| 1086 | err = x->type->init_state(x); |
| 1087 | if (err) |
| 1088 | goto error; |
| 1089 | |
| 1090 | x->km.state = XFRM_STATE_VALID; |
| 1091 | |
| 1092 | error: |
| 1093 | return err; |
| 1094 | } |
| 1095 | |
| 1096 | EXPORT_SYMBOL(xfrm_init_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1097 | |
| 1098 | void __init xfrm_state_init(void) |
| 1099 | { |
| 1100 | int i; |
| 1101 | |
| 1102 | for (i=0; i<XFRM_DST_HSIZE; i++) { |
| 1103 | INIT_LIST_HEAD(&xfrm_state_bydst[i]); |
| 1104 | INIT_LIST_HEAD(&xfrm_state_byspi[i]); |
| 1105 | } |
| 1106 | INIT_WORK(&xfrm_state_gc_work, xfrm_state_gc_task, NULL); |
| 1107 | } |
| 1108 | |