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 |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 13 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
David S. Miller | ee857a7 | 2006-03-20 19:18:37 -0800 | [diff] [blame^] | 23 | struct sock *xfrm_nl; |
| 24 | EXPORT_SYMBOL(xfrm_nl); |
| 25 | |
Jamal Hadi Salim | f8cd548 | 2006-03-20 19:15:11 -0800 | [diff] [blame] | 26 | u32 sysctl_xfrm_aevent_etime = XFRM_AE_ETIME; |
| 27 | u32 sysctl_xfrm_aevent_rseqth = XFRM_AE_SEQT_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | /* Each xfrm_state may be linked to two tables: |
| 29 | |
| 30 | 1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl) |
| 31 | 2. Hash table by daddr to find what SAs exist for given |
| 32 | destination/tunnel endpoint. (output) |
| 33 | */ |
| 34 | |
| 35 | static DEFINE_SPINLOCK(xfrm_state_lock); |
| 36 | |
| 37 | /* Hash table to find appropriate SA towards given target (endpoint |
| 38 | * of tunnel or destination of transport mode) allowed by selector. |
| 39 | * |
| 40 | * Main use is finding SA after policy selected tunnel or transport mode. |
| 41 | * Also, it can be used by ah/esp icmp error handler to find offending SA. |
| 42 | */ |
| 43 | static struct list_head xfrm_state_bydst[XFRM_DST_HSIZE]; |
| 44 | static struct list_head xfrm_state_byspi[XFRM_DST_HSIZE]; |
| 45 | |
| 46 | DECLARE_WAIT_QUEUE_HEAD(km_waitq); |
| 47 | EXPORT_SYMBOL(km_waitq); |
| 48 | |
| 49 | static DEFINE_RWLOCK(xfrm_state_afinfo_lock); |
| 50 | static struct xfrm_state_afinfo *xfrm_state_afinfo[NPROTO]; |
| 51 | |
| 52 | static struct work_struct xfrm_state_gc_work; |
| 53 | static struct list_head xfrm_state_gc_list = LIST_HEAD_INIT(xfrm_state_gc_list); |
| 54 | static DEFINE_SPINLOCK(xfrm_state_gc_lock); |
| 55 | |
| 56 | static int xfrm_state_gc_flush_bundles; |
| 57 | |
Jamal Hadi Salim | 53bc6b4 | 2006-03-20 19:17:03 -0800 | [diff] [blame] | 58 | int __xfrm_state_delete(struct xfrm_state *x); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | |
| 60 | static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family); |
| 61 | static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo); |
| 62 | |
Jamal Hadi Salim | 980ebd2 | 2006-03-20 19:16:40 -0800 | [diff] [blame] | 63 | int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); |
Jamal Hadi Salim | 53bc6b4 | 2006-03-20 19:17:03 -0800 | [diff] [blame] | 64 | void km_state_expired(struct xfrm_state *x, int hard, u32 pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | |
| 66 | static void xfrm_state_gc_destroy(struct xfrm_state *x) |
| 67 | { |
| 68 | if (del_timer(&x->timer)) |
| 69 | BUG(); |
Jamal Hadi Salim | f8cd548 | 2006-03-20 19:15:11 -0800 | [diff] [blame] | 70 | if (del_timer(&x->rtimer)) |
| 71 | BUG(); |
Jesper Juhl | a51482b | 2005-11-08 09:41:34 -0800 | [diff] [blame] | 72 | kfree(x->aalg); |
| 73 | kfree(x->ealg); |
| 74 | kfree(x->calg); |
| 75 | kfree(x->encap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | if (x->type) { |
| 77 | x->type->destructor(x); |
| 78 | xfrm_put_type(x->type); |
| 79 | } |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 80 | security_xfrm_state_free(x); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | kfree(x); |
| 82 | } |
| 83 | |
| 84 | static void xfrm_state_gc_task(void *data) |
| 85 | { |
| 86 | struct xfrm_state *x; |
| 87 | struct list_head *entry, *tmp; |
| 88 | struct list_head gc_list = LIST_HEAD_INIT(gc_list); |
| 89 | |
| 90 | if (xfrm_state_gc_flush_bundles) { |
| 91 | xfrm_state_gc_flush_bundles = 0; |
| 92 | xfrm_flush_bundles(); |
| 93 | } |
| 94 | |
| 95 | spin_lock_bh(&xfrm_state_gc_lock); |
| 96 | list_splice_init(&xfrm_state_gc_list, &gc_list); |
| 97 | spin_unlock_bh(&xfrm_state_gc_lock); |
| 98 | |
| 99 | list_for_each_safe(entry, tmp, &gc_list) { |
| 100 | x = list_entry(entry, struct xfrm_state, bydst); |
| 101 | xfrm_state_gc_destroy(x); |
| 102 | } |
| 103 | wake_up(&km_waitq); |
| 104 | } |
| 105 | |
| 106 | static inline unsigned long make_jiffies(long secs) |
| 107 | { |
| 108 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) |
| 109 | return MAX_SCHEDULE_TIMEOUT-1; |
| 110 | else |
| 111 | return secs*HZ; |
| 112 | } |
| 113 | |
| 114 | static void xfrm_timer_handler(unsigned long data) |
| 115 | { |
| 116 | struct xfrm_state *x = (struct xfrm_state*)data; |
| 117 | unsigned long now = (unsigned long)xtime.tv_sec; |
| 118 | long next = LONG_MAX; |
| 119 | int warn = 0; |
| 120 | |
| 121 | spin_lock(&x->lock); |
| 122 | if (x->km.state == XFRM_STATE_DEAD) |
| 123 | goto out; |
| 124 | if (x->km.state == XFRM_STATE_EXPIRED) |
| 125 | goto expired; |
| 126 | if (x->lft.hard_add_expires_seconds) { |
| 127 | long tmo = x->lft.hard_add_expires_seconds + |
| 128 | x->curlft.add_time - now; |
| 129 | if (tmo <= 0) |
| 130 | goto expired; |
| 131 | if (tmo < next) |
| 132 | next = tmo; |
| 133 | } |
| 134 | if (x->lft.hard_use_expires_seconds) { |
| 135 | long tmo = x->lft.hard_use_expires_seconds + |
| 136 | (x->curlft.use_time ? : now) - now; |
| 137 | if (tmo <= 0) |
| 138 | goto expired; |
| 139 | if (tmo < next) |
| 140 | next = tmo; |
| 141 | } |
| 142 | if (x->km.dying) |
| 143 | goto resched; |
| 144 | if (x->lft.soft_add_expires_seconds) { |
| 145 | long tmo = x->lft.soft_add_expires_seconds + |
| 146 | x->curlft.add_time - now; |
| 147 | if (tmo <= 0) |
| 148 | warn = 1; |
| 149 | else if (tmo < next) |
| 150 | next = tmo; |
| 151 | } |
| 152 | if (x->lft.soft_use_expires_seconds) { |
| 153 | long tmo = x->lft.soft_use_expires_seconds + |
| 154 | (x->curlft.use_time ? : now) - now; |
| 155 | if (tmo <= 0) |
| 156 | warn = 1; |
| 157 | else if (tmo < next) |
| 158 | next = tmo; |
| 159 | } |
| 160 | |
Herbert Xu | 4666faa | 2005-06-18 22:43:22 -0700 | [diff] [blame] | 161 | x->km.dying = warn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | if (warn) |
Jamal Hadi Salim | 53bc6b4 | 2006-03-20 19:17:03 -0800 | [diff] [blame] | 163 | km_state_expired(x, 0, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | resched: |
| 165 | if (next != LONG_MAX && |
| 166 | !mod_timer(&x->timer, jiffies + make_jiffies(next))) |
| 167 | xfrm_state_hold(x); |
| 168 | goto out; |
| 169 | |
| 170 | expired: |
| 171 | if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) { |
| 172 | x->km.state = XFRM_STATE_EXPIRED; |
| 173 | wake_up(&km_waitq); |
| 174 | next = 2; |
| 175 | goto resched; |
| 176 | } |
Herbert Xu | 4666faa | 2005-06-18 22:43:22 -0700 | [diff] [blame] | 177 | if (!__xfrm_state_delete(x) && x->id.spi) |
Jamal Hadi Salim | 53bc6b4 | 2006-03-20 19:17:03 -0800 | [diff] [blame] | 178 | km_state_expired(x, 1, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | |
| 180 | out: |
| 181 | spin_unlock(&x->lock); |
| 182 | xfrm_state_put(x); |
| 183 | } |
| 184 | |
David S. Miller | 0ac8475 | 2006-03-20 19:18:23 -0800 | [diff] [blame] | 185 | static void xfrm_replay_timer_handler(unsigned long data); |
| 186 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | struct xfrm_state *xfrm_state_alloc(void) |
| 188 | { |
| 189 | struct xfrm_state *x; |
| 190 | |
| 191 | x = kmalloc(sizeof(struct xfrm_state), GFP_ATOMIC); |
| 192 | |
| 193 | if (x) { |
| 194 | memset(x, 0, sizeof(struct xfrm_state)); |
| 195 | atomic_set(&x->refcnt, 1); |
| 196 | atomic_set(&x->tunnel_users, 0); |
| 197 | INIT_LIST_HEAD(&x->bydst); |
| 198 | INIT_LIST_HEAD(&x->byspi); |
| 199 | init_timer(&x->timer); |
| 200 | x->timer.function = xfrm_timer_handler; |
| 201 | x->timer.data = (unsigned long)x; |
Jamal Hadi Salim | f8cd548 | 2006-03-20 19:15:11 -0800 | [diff] [blame] | 202 | init_timer(&x->rtimer); |
| 203 | x->rtimer.function = xfrm_replay_timer_handler; |
| 204 | x->rtimer.data = (unsigned long)x; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | x->curlft.add_time = (unsigned long)xtime.tv_sec; |
| 206 | x->lft.soft_byte_limit = XFRM_INF; |
| 207 | x->lft.soft_packet_limit = XFRM_INF; |
| 208 | x->lft.hard_byte_limit = XFRM_INF; |
| 209 | x->lft.hard_packet_limit = XFRM_INF; |
Jamal Hadi Salim | f8cd548 | 2006-03-20 19:15:11 -0800 | [diff] [blame] | 210 | x->replay_maxage = 0; |
| 211 | x->replay_maxdiff = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | spin_lock_init(&x->lock); |
| 213 | } |
| 214 | return x; |
| 215 | } |
| 216 | EXPORT_SYMBOL(xfrm_state_alloc); |
| 217 | |
| 218 | void __xfrm_state_destroy(struct xfrm_state *x) |
| 219 | { |
| 220 | BUG_TRAP(x->km.state == XFRM_STATE_DEAD); |
| 221 | |
| 222 | spin_lock_bh(&xfrm_state_gc_lock); |
| 223 | list_add(&x->bydst, &xfrm_state_gc_list); |
| 224 | spin_unlock_bh(&xfrm_state_gc_lock); |
| 225 | schedule_work(&xfrm_state_gc_work); |
| 226 | } |
| 227 | EXPORT_SYMBOL(__xfrm_state_destroy); |
| 228 | |
Jamal Hadi Salim | 53bc6b4 | 2006-03-20 19:17:03 -0800 | [diff] [blame] | 229 | int __xfrm_state_delete(struct xfrm_state *x) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | { |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 231 | int err = -ESRCH; |
| 232 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | if (x->km.state != XFRM_STATE_DEAD) { |
| 234 | x->km.state = XFRM_STATE_DEAD; |
| 235 | spin_lock(&xfrm_state_lock); |
| 236 | list_del(&x->bydst); |
Herbert Xu | 21380b8 | 2006-02-22 14:47:13 -0800 | [diff] [blame] | 237 | __xfrm_state_put(x); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | if (x->id.spi) { |
| 239 | list_del(&x->byspi); |
Herbert Xu | 21380b8 | 2006-02-22 14:47:13 -0800 | [diff] [blame] | 240 | __xfrm_state_put(x); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | } |
| 242 | spin_unlock(&xfrm_state_lock); |
| 243 | if (del_timer(&x->timer)) |
Herbert Xu | 21380b8 | 2006-02-22 14:47:13 -0800 | [diff] [blame] | 244 | __xfrm_state_put(x); |
Jamal Hadi Salim | f8cd548 | 2006-03-20 19:15:11 -0800 | [diff] [blame] | 245 | if (del_timer(&x->rtimer)) |
| 246 | __xfrm_state_put(x); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | |
| 248 | /* The number two in this test is the reference |
| 249 | * mentioned in the comment below plus the reference |
| 250 | * our caller holds. A larger value means that |
| 251 | * there are DSTs attached to this xfrm_state. |
| 252 | */ |
| 253 | if (atomic_read(&x->refcnt) > 2) { |
| 254 | xfrm_state_gc_flush_bundles = 1; |
| 255 | schedule_work(&xfrm_state_gc_work); |
| 256 | } |
| 257 | |
| 258 | /* All xfrm_state objects are created by xfrm_state_alloc. |
| 259 | * The xfrm_state_alloc call gives a reference, and that |
| 260 | * is what we are dropping here. |
| 261 | */ |
Herbert Xu | 21380b8 | 2006-02-22 14:47:13 -0800 | [diff] [blame] | 262 | __xfrm_state_put(x); |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 263 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | } |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 265 | |
| 266 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | } |
Jamal Hadi Salim | 53bc6b4 | 2006-03-20 19:17:03 -0800 | [diff] [blame] | 268 | EXPORT_SYMBOL(__xfrm_state_delete); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 270 | int xfrm_state_delete(struct xfrm_state *x) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | { |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 272 | int err; |
| 273 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | spin_lock_bh(&x->lock); |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 275 | err = __xfrm_state_delete(x); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | spin_unlock_bh(&x->lock); |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 277 | |
| 278 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | } |
| 280 | EXPORT_SYMBOL(xfrm_state_delete); |
| 281 | |
| 282 | void xfrm_state_flush(u8 proto) |
| 283 | { |
| 284 | int i; |
| 285 | struct xfrm_state *x; |
| 286 | |
| 287 | spin_lock_bh(&xfrm_state_lock); |
| 288 | for (i = 0; i < XFRM_DST_HSIZE; i++) { |
| 289 | restart: |
| 290 | list_for_each_entry(x, xfrm_state_bydst+i, bydst) { |
| 291 | if (!xfrm_state_kern(x) && |
| 292 | (proto == IPSEC_PROTO_ANY || x->id.proto == proto)) { |
| 293 | xfrm_state_hold(x); |
| 294 | spin_unlock_bh(&xfrm_state_lock); |
| 295 | |
| 296 | xfrm_state_delete(x); |
| 297 | xfrm_state_put(x); |
| 298 | |
| 299 | spin_lock_bh(&xfrm_state_lock); |
| 300 | goto restart; |
| 301 | } |
| 302 | } |
| 303 | } |
| 304 | spin_unlock_bh(&xfrm_state_lock); |
| 305 | wake_up(&km_waitq); |
| 306 | } |
| 307 | EXPORT_SYMBOL(xfrm_state_flush); |
| 308 | |
| 309 | static int |
| 310 | xfrm_init_tempsel(struct xfrm_state *x, struct flowi *fl, |
| 311 | struct xfrm_tmpl *tmpl, |
| 312 | xfrm_address_t *daddr, xfrm_address_t *saddr, |
| 313 | unsigned short family) |
| 314 | { |
| 315 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); |
| 316 | if (!afinfo) |
| 317 | return -1; |
| 318 | afinfo->init_tempsel(x, fl, tmpl, daddr, saddr); |
| 319 | xfrm_state_put_afinfo(afinfo); |
| 320 | return 0; |
| 321 | } |
| 322 | |
| 323 | struct xfrm_state * |
| 324 | xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, |
| 325 | struct flowi *fl, struct xfrm_tmpl *tmpl, |
| 326 | struct xfrm_policy *pol, int *err, |
| 327 | unsigned short family) |
| 328 | { |
| 329 | unsigned h = xfrm_dst_hash(daddr, family); |
| 330 | struct xfrm_state *x, *x0; |
| 331 | int acquire_in_progress = 0; |
| 332 | int error = 0; |
| 333 | struct xfrm_state *best = NULL; |
| 334 | struct xfrm_state_afinfo *afinfo; |
| 335 | |
| 336 | afinfo = xfrm_state_get_afinfo(family); |
| 337 | if (afinfo == NULL) { |
| 338 | *err = -EAFNOSUPPORT; |
| 339 | return NULL; |
| 340 | } |
| 341 | |
| 342 | spin_lock_bh(&xfrm_state_lock); |
| 343 | list_for_each_entry(x, xfrm_state_bydst+h, bydst) { |
| 344 | if (x->props.family == family && |
| 345 | x->props.reqid == tmpl->reqid && |
| 346 | xfrm_state_addr_check(x, daddr, saddr, family) && |
| 347 | tmpl->mode == x->props.mode && |
| 348 | tmpl->id.proto == x->id.proto && |
| 349 | (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) { |
| 350 | /* Resolution logic: |
| 351 | 1. There is a valid state with matching selector. |
| 352 | Done. |
| 353 | 2. Valid state with inappropriate selector. Skip. |
| 354 | |
| 355 | Entering area of "sysdeps". |
| 356 | |
| 357 | 3. If state is not valid, selector is temporary, |
| 358 | it selects only session which triggered |
| 359 | previous resolution. Key manager will do |
| 360 | something to install a state with proper |
| 361 | selector. |
| 362 | */ |
| 363 | if (x->km.state == XFRM_STATE_VALID) { |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 364 | if (!xfrm_selector_match(&x->sel, fl, family) || |
| 365 | !xfrm_sec_ctx_match(pol->security, x->security)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | continue; |
| 367 | if (!best || |
| 368 | best->km.dying > x->km.dying || |
| 369 | (best->km.dying == x->km.dying && |
| 370 | best->curlft.add_time < x->curlft.add_time)) |
| 371 | best = x; |
| 372 | } else if (x->km.state == XFRM_STATE_ACQ) { |
| 373 | acquire_in_progress = 1; |
| 374 | } else if (x->km.state == XFRM_STATE_ERROR || |
| 375 | x->km.state == XFRM_STATE_EXPIRED) { |
Trent Jaeger | df71837 | 2005-12-13 23:12:27 -0800 | [diff] [blame] | 376 | if (xfrm_selector_match(&x->sel, fl, family) && |
| 377 | xfrm_sec_ctx_match(pol->security, x->security)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | error = -ESRCH; |
| 379 | } |
| 380 | } |
| 381 | } |
| 382 | |
| 383 | x = best; |
| 384 | if (!x && !error && !acquire_in_progress) { |
Patrick McHardy | 5c5d281 | 2005-04-21 20:12:32 -0700 | [diff] [blame] | 385 | if (tmpl->id.spi && |
| 386 | (x0 = afinfo->state_lookup(daddr, tmpl->id.spi, |
| 387 | tmpl->id.proto)) != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | xfrm_state_put(x0); |
| 389 | error = -EEXIST; |
| 390 | goto out; |
| 391 | } |
| 392 | x = xfrm_state_alloc(); |
| 393 | if (x == NULL) { |
| 394 | error = -ENOMEM; |
| 395 | goto out; |
| 396 | } |
| 397 | /* Initialize temporary selector matching only |
| 398 | * to current session. */ |
| 399 | xfrm_init_tempsel(x, fl, tmpl, daddr, saddr, family); |
| 400 | |
| 401 | if (km_query(x, tmpl, pol) == 0) { |
| 402 | x->km.state = XFRM_STATE_ACQ; |
| 403 | list_add_tail(&x->bydst, xfrm_state_bydst+h); |
| 404 | xfrm_state_hold(x); |
| 405 | if (x->id.spi) { |
| 406 | h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, family); |
| 407 | list_add(&x->byspi, xfrm_state_byspi+h); |
| 408 | xfrm_state_hold(x); |
| 409 | } |
| 410 | x->lft.hard_add_expires_seconds = XFRM_ACQ_EXPIRES; |
| 411 | xfrm_state_hold(x); |
| 412 | x->timer.expires = jiffies + XFRM_ACQ_EXPIRES*HZ; |
| 413 | add_timer(&x->timer); |
| 414 | } else { |
| 415 | x->km.state = XFRM_STATE_DEAD; |
| 416 | xfrm_state_put(x); |
| 417 | x = NULL; |
| 418 | error = -ESRCH; |
| 419 | } |
| 420 | } |
| 421 | out: |
| 422 | if (x) |
| 423 | xfrm_state_hold(x); |
| 424 | else |
| 425 | *err = acquire_in_progress ? -EAGAIN : error; |
| 426 | spin_unlock_bh(&xfrm_state_lock); |
| 427 | xfrm_state_put_afinfo(afinfo); |
| 428 | return x; |
| 429 | } |
| 430 | |
| 431 | static void __xfrm_state_insert(struct xfrm_state *x) |
| 432 | { |
| 433 | unsigned h = xfrm_dst_hash(&x->id.daddr, x->props.family); |
| 434 | |
| 435 | list_add(&x->bydst, xfrm_state_bydst+h); |
| 436 | xfrm_state_hold(x); |
| 437 | |
| 438 | h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, x->props.family); |
| 439 | |
| 440 | list_add(&x->byspi, xfrm_state_byspi+h); |
| 441 | xfrm_state_hold(x); |
| 442 | |
| 443 | if (!mod_timer(&x->timer, jiffies + HZ)) |
| 444 | xfrm_state_hold(x); |
| 445 | |
Jamal Hadi Salim | f8cd548 | 2006-03-20 19:15:11 -0800 | [diff] [blame] | 446 | if (x->replay_maxage && |
| 447 | !mod_timer(&x->rtimer, jiffies + x->replay_maxage)) |
| 448 | xfrm_state_hold(x); |
| 449 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | wake_up(&km_waitq); |
| 451 | } |
| 452 | |
| 453 | void xfrm_state_insert(struct xfrm_state *x) |
| 454 | { |
| 455 | spin_lock_bh(&xfrm_state_lock); |
| 456 | __xfrm_state_insert(x); |
| 457 | spin_unlock_bh(&xfrm_state_lock); |
David S. Miller | 399c180 | 2005-12-19 14:23:23 -0800 | [diff] [blame] | 458 | |
| 459 | xfrm_flush_all_bundles(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | } |
| 461 | EXPORT_SYMBOL(xfrm_state_insert); |
| 462 | |
| 463 | static struct xfrm_state *__xfrm_find_acq_byseq(u32 seq); |
| 464 | |
| 465 | int xfrm_state_add(struct xfrm_state *x) |
| 466 | { |
| 467 | struct xfrm_state_afinfo *afinfo; |
| 468 | struct xfrm_state *x1; |
| 469 | int family; |
| 470 | int err; |
| 471 | |
| 472 | family = x->props.family; |
| 473 | afinfo = xfrm_state_get_afinfo(family); |
| 474 | if (unlikely(afinfo == NULL)) |
| 475 | return -EAFNOSUPPORT; |
| 476 | |
| 477 | spin_lock_bh(&xfrm_state_lock); |
| 478 | |
| 479 | x1 = afinfo->state_lookup(&x->id.daddr, x->id.spi, x->id.proto); |
| 480 | if (x1) { |
| 481 | xfrm_state_put(x1); |
| 482 | x1 = NULL; |
| 483 | err = -EEXIST; |
| 484 | goto out; |
| 485 | } |
| 486 | |
| 487 | if (x->km.seq) { |
| 488 | x1 = __xfrm_find_acq_byseq(x->km.seq); |
| 489 | if (x1 && xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family)) { |
| 490 | xfrm_state_put(x1); |
| 491 | x1 = NULL; |
| 492 | } |
| 493 | } |
| 494 | |
| 495 | if (!x1) |
| 496 | x1 = afinfo->find_acq( |
| 497 | x->props.mode, x->props.reqid, x->id.proto, |
| 498 | &x->id.daddr, &x->props.saddr, 0); |
| 499 | |
| 500 | __xfrm_state_insert(x); |
| 501 | err = 0; |
| 502 | |
| 503 | out: |
| 504 | spin_unlock_bh(&xfrm_state_lock); |
| 505 | xfrm_state_put_afinfo(afinfo); |
| 506 | |
David S. Miller | 399c180 | 2005-12-19 14:23:23 -0800 | [diff] [blame] | 507 | if (!err) |
| 508 | xfrm_flush_all_bundles(); |
| 509 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | if (x1) { |
| 511 | xfrm_state_delete(x1); |
| 512 | xfrm_state_put(x1); |
| 513 | } |
| 514 | |
| 515 | return err; |
| 516 | } |
| 517 | EXPORT_SYMBOL(xfrm_state_add); |
| 518 | |
| 519 | int xfrm_state_update(struct xfrm_state *x) |
| 520 | { |
| 521 | struct xfrm_state_afinfo *afinfo; |
| 522 | struct xfrm_state *x1; |
| 523 | int err; |
| 524 | |
| 525 | afinfo = xfrm_state_get_afinfo(x->props.family); |
| 526 | if (unlikely(afinfo == NULL)) |
| 527 | return -EAFNOSUPPORT; |
| 528 | |
| 529 | spin_lock_bh(&xfrm_state_lock); |
| 530 | x1 = afinfo->state_lookup(&x->id.daddr, x->id.spi, x->id.proto); |
| 531 | |
| 532 | err = -ESRCH; |
| 533 | if (!x1) |
| 534 | goto out; |
| 535 | |
| 536 | if (xfrm_state_kern(x1)) { |
| 537 | xfrm_state_put(x1); |
| 538 | err = -EEXIST; |
| 539 | goto out; |
| 540 | } |
| 541 | |
| 542 | if (x1->km.state == XFRM_STATE_ACQ) { |
| 543 | __xfrm_state_insert(x); |
| 544 | x = NULL; |
| 545 | } |
| 546 | err = 0; |
| 547 | |
| 548 | out: |
| 549 | spin_unlock_bh(&xfrm_state_lock); |
| 550 | xfrm_state_put_afinfo(afinfo); |
| 551 | |
| 552 | if (err) |
| 553 | return err; |
| 554 | |
| 555 | if (!x) { |
| 556 | xfrm_state_delete(x1); |
| 557 | xfrm_state_put(x1); |
| 558 | return 0; |
| 559 | } |
| 560 | |
| 561 | err = -EINVAL; |
| 562 | spin_lock_bh(&x1->lock); |
| 563 | if (likely(x1->km.state == XFRM_STATE_VALID)) { |
| 564 | if (x->encap && x1->encap) |
| 565 | memcpy(x1->encap, x->encap, sizeof(*x1->encap)); |
| 566 | memcpy(&x1->lft, &x->lft, sizeof(x1->lft)); |
| 567 | x1->km.dying = 0; |
| 568 | |
| 569 | if (!mod_timer(&x1->timer, jiffies + HZ)) |
| 570 | xfrm_state_hold(x1); |
| 571 | if (x1->curlft.use_time) |
| 572 | xfrm_state_check_expire(x1); |
| 573 | |
| 574 | err = 0; |
| 575 | } |
| 576 | spin_unlock_bh(&x1->lock); |
| 577 | |
| 578 | xfrm_state_put(x1); |
| 579 | |
| 580 | return err; |
| 581 | } |
| 582 | EXPORT_SYMBOL(xfrm_state_update); |
| 583 | |
| 584 | int xfrm_state_check_expire(struct xfrm_state *x) |
| 585 | { |
| 586 | if (!x->curlft.use_time) |
| 587 | x->curlft.use_time = (unsigned long)xtime.tv_sec; |
| 588 | |
| 589 | if (x->km.state != XFRM_STATE_VALID) |
| 590 | return -EINVAL; |
| 591 | |
| 592 | if (x->curlft.bytes >= x->lft.hard_byte_limit || |
| 593 | x->curlft.packets >= x->lft.hard_packet_limit) { |
Herbert Xu | 4666faa | 2005-06-18 22:43:22 -0700 | [diff] [blame] | 594 | x->km.state = XFRM_STATE_EXPIRED; |
| 595 | if (!mod_timer(&x->timer, jiffies)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | xfrm_state_hold(x); |
| 597 | return -EINVAL; |
| 598 | } |
| 599 | |
| 600 | if (!x->km.dying && |
| 601 | (x->curlft.bytes >= x->lft.soft_byte_limit || |
Herbert Xu | 4666faa | 2005-06-18 22:43:22 -0700 | [diff] [blame] | 602 | x->curlft.packets >= x->lft.soft_packet_limit)) { |
| 603 | x->km.dying = 1; |
Jamal Hadi Salim | 53bc6b4 | 2006-03-20 19:17:03 -0800 | [diff] [blame] | 604 | km_state_expired(x, 0, 0); |
Herbert Xu | 4666faa | 2005-06-18 22:43:22 -0700 | [diff] [blame] | 605 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | return 0; |
| 607 | } |
| 608 | EXPORT_SYMBOL(xfrm_state_check_expire); |
| 609 | |
| 610 | static int xfrm_state_check_space(struct xfrm_state *x, struct sk_buff *skb) |
| 611 | { |
| 612 | int nhead = x->props.header_len + LL_RESERVED_SPACE(skb->dst->dev) |
| 613 | - skb_headroom(skb); |
| 614 | |
| 615 | if (nhead > 0) |
| 616 | return pskb_expand_head(skb, nhead, 0, GFP_ATOMIC); |
| 617 | |
| 618 | /* Check tail too... */ |
| 619 | return 0; |
| 620 | } |
| 621 | |
| 622 | int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb) |
| 623 | { |
| 624 | int err = xfrm_state_check_expire(x); |
| 625 | if (err < 0) |
| 626 | goto err; |
| 627 | err = xfrm_state_check_space(x, skb); |
| 628 | err: |
| 629 | return err; |
| 630 | } |
| 631 | EXPORT_SYMBOL(xfrm_state_check); |
| 632 | |
| 633 | struct xfrm_state * |
| 634 | xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, |
| 635 | unsigned short family) |
| 636 | { |
| 637 | struct xfrm_state *x; |
| 638 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); |
| 639 | if (!afinfo) |
| 640 | return NULL; |
| 641 | |
| 642 | spin_lock_bh(&xfrm_state_lock); |
| 643 | x = afinfo->state_lookup(daddr, spi, proto); |
| 644 | spin_unlock_bh(&xfrm_state_lock); |
| 645 | xfrm_state_put_afinfo(afinfo); |
| 646 | return x; |
| 647 | } |
| 648 | EXPORT_SYMBOL(xfrm_state_lookup); |
| 649 | |
| 650 | struct xfrm_state * |
| 651 | xfrm_find_acq(u8 mode, u32 reqid, u8 proto, |
| 652 | xfrm_address_t *daddr, xfrm_address_t *saddr, |
| 653 | int create, unsigned short family) |
| 654 | { |
| 655 | struct xfrm_state *x; |
| 656 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); |
| 657 | if (!afinfo) |
| 658 | return NULL; |
| 659 | |
| 660 | spin_lock_bh(&xfrm_state_lock); |
| 661 | x = afinfo->find_acq(mode, reqid, proto, daddr, saddr, create); |
| 662 | spin_unlock_bh(&xfrm_state_lock); |
| 663 | xfrm_state_put_afinfo(afinfo); |
| 664 | return x; |
| 665 | } |
| 666 | EXPORT_SYMBOL(xfrm_find_acq); |
| 667 | |
| 668 | /* Silly enough, but I'm lazy to build resolution list */ |
| 669 | |
| 670 | static struct xfrm_state *__xfrm_find_acq_byseq(u32 seq) |
| 671 | { |
| 672 | int i; |
| 673 | struct xfrm_state *x; |
| 674 | |
| 675 | for (i = 0; i < XFRM_DST_HSIZE; i++) { |
| 676 | list_for_each_entry(x, xfrm_state_bydst+i, bydst) { |
| 677 | if (x->km.seq == seq && x->km.state == XFRM_STATE_ACQ) { |
| 678 | xfrm_state_hold(x); |
| 679 | return x; |
| 680 | } |
| 681 | } |
| 682 | } |
| 683 | return NULL; |
| 684 | } |
| 685 | |
| 686 | struct xfrm_state *xfrm_find_acq_byseq(u32 seq) |
| 687 | { |
| 688 | struct xfrm_state *x; |
| 689 | |
| 690 | spin_lock_bh(&xfrm_state_lock); |
| 691 | x = __xfrm_find_acq_byseq(seq); |
| 692 | spin_unlock_bh(&xfrm_state_lock); |
| 693 | return x; |
| 694 | } |
| 695 | EXPORT_SYMBOL(xfrm_find_acq_byseq); |
| 696 | |
| 697 | u32 xfrm_get_acqseq(void) |
| 698 | { |
| 699 | u32 res; |
| 700 | static u32 acqseq; |
| 701 | static DEFINE_SPINLOCK(acqseq_lock); |
| 702 | |
| 703 | spin_lock_bh(&acqseq_lock); |
| 704 | res = (++acqseq ? : ++acqseq); |
| 705 | spin_unlock_bh(&acqseq_lock); |
| 706 | return res; |
| 707 | } |
| 708 | EXPORT_SYMBOL(xfrm_get_acqseq); |
| 709 | |
| 710 | void |
| 711 | xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi) |
| 712 | { |
| 713 | u32 h; |
| 714 | struct xfrm_state *x0; |
| 715 | |
| 716 | if (x->id.spi) |
| 717 | return; |
| 718 | |
| 719 | if (minspi == maxspi) { |
| 720 | x0 = xfrm_state_lookup(&x->id.daddr, minspi, x->id.proto, x->props.family); |
| 721 | if (x0) { |
| 722 | xfrm_state_put(x0); |
| 723 | return; |
| 724 | } |
| 725 | x->id.spi = minspi; |
| 726 | } else { |
| 727 | u32 spi = 0; |
| 728 | minspi = ntohl(minspi); |
| 729 | maxspi = ntohl(maxspi); |
| 730 | for (h=0; h<maxspi-minspi+1; h++) { |
| 731 | spi = minspi + net_random()%(maxspi-minspi+1); |
| 732 | x0 = xfrm_state_lookup(&x->id.daddr, htonl(spi), x->id.proto, x->props.family); |
| 733 | if (x0 == NULL) { |
| 734 | x->id.spi = htonl(spi); |
| 735 | break; |
| 736 | } |
| 737 | xfrm_state_put(x0); |
| 738 | } |
| 739 | } |
| 740 | if (x->id.spi) { |
| 741 | spin_lock_bh(&xfrm_state_lock); |
| 742 | h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, x->props.family); |
| 743 | list_add(&x->byspi, xfrm_state_byspi+h); |
| 744 | xfrm_state_hold(x); |
| 745 | spin_unlock_bh(&xfrm_state_lock); |
| 746 | wake_up(&km_waitq); |
| 747 | } |
| 748 | } |
| 749 | EXPORT_SYMBOL(xfrm_alloc_spi); |
| 750 | |
| 751 | int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), |
| 752 | void *data) |
| 753 | { |
| 754 | int i; |
| 755 | struct xfrm_state *x; |
| 756 | int count = 0; |
| 757 | int err = 0; |
| 758 | |
| 759 | spin_lock_bh(&xfrm_state_lock); |
| 760 | for (i = 0; i < XFRM_DST_HSIZE; i++) { |
| 761 | list_for_each_entry(x, xfrm_state_bydst+i, bydst) { |
| 762 | if (proto == IPSEC_PROTO_ANY || x->id.proto == proto) |
| 763 | count++; |
| 764 | } |
| 765 | } |
| 766 | if (count == 0) { |
| 767 | err = -ENOENT; |
| 768 | goto out; |
| 769 | } |
| 770 | |
| 771 | for (i = 0; i < XFRM_DST_HSIZE; i++) { |
| 772 | list_for_each_entry(x, xfrm_state_bydst+i, bydst) { |
| 773 | if (proto != IPSEC_PROTO_ANY && x->id.proto != proto) |
| 774 | continue; |
| 775 | err = func(x, --count, data); |
| 776 | if (err) |
| 777 | goto out; |
| 778 | } |
| 779 | } |
| 780 | out: |
| 781 | spin_unlock_bh(&xfrm_state_lock); |
| 782 | return err; |
| 783 | } |
| 784 | EXPORT_SYMBOL(xfrm_state_walk); |
| 785 | |
Jamal Hadi Salim | f8cd548 | 2006-03-20 19:15:11 -0800 | [diff] [blame] | 786 | |
| 787 | void xfrm_replay_notify(struct xfrm_state *x, int event) |
| 788 | { |
| 789 | struct km_event c; |
| 790 | /* we send notify messages in case |
| 791 | * 1. we updated on of the sequence numbers, and the seqno difference |
| 792 | * is at least x->replay_maxdiff, in this case we also update the |
| 793 | * timeout of our timer function |
| 794 | * 2. if x->replay_maxage has elapsed since last update, |
| 795 | * and there were changes |
| 796 | * |
| 797 | * The state structure must be locked! |
| 798 | */ |
| 799 | |
| 800 | switch (event) { |
| 801 | case XFRM_REPLAY_UPDATE: |
| 802 | if (x->replay_maxdiff && |
| 803 | (x->replay.seq - x->preplay.seq < x->replay_maxdiff) && |
| 804 | (x->replay.oseq - x->preplay.oseq < x->replay_maxdiff)) |
| 805 | return; |
| 806 | |
| 807 | break; |
| 808 | |
| 809 | case XFRM_REPLAY_TIMEOUT: |
| 810 | if ((x->replay.seq == x->preplay.seq) && |
| 811 | (x->replay.bitmap == x->preplay.bitmap) && |
| 812 | (x->replay.oseq == x->preplay.oseq)) |
| 813 | return; |
| 814 | |
| 815 | break; |
| 816 | } |
| 817 | |
| 818 | memcpy(&x->preplay, &x->replay, sizeof(struct xfrm_replay_state)); |
| 819 | c.event = XFRM_MSG_NEWAE; |
| 820 | c.data.aevent = event; |
| 821 | km_state_notify(x, &c); |
| 822 | |
Jamal Hadi Salim | f8cd548 | 2006-03-20 19:15:11 -0800 | [diff] [blame] | 823 | if (x->replay_maxage && |
| 824 | !mod_timer(&x->rtimer, jiffies + x->replay_maxage)) |
| 825 | xfrm_state_hold(x); |
Jamal Hadi Salim | f8cd548 | 2006-03-20 19:15:11 -0800 | [diff] [blame] | 826 | } |
| 827 | |
| 828 | static void xfrm_replay_timer_handler(unsigned long data) |
| 829 | { |
| 830 | struct xfrm_state *x = (struct xfrm_state*)data; |
| 831 | |
| 832 | spin_lock(&x->lock); |
| 833 | |
| 834 | if (xfrm_aevent_is_on() && x->km.state == XFRM_STATE_VALID) |
| 835 | xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT); |
| 836 | |
| 837 | spin_unlock(&x->lock); |
| 838 | } |
| 839 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | int xfrm_replay_check(struct xfrm_state *x, u32 seq) |
| 841 | { |
| 842 | u32 diff; |
| 843 | |
| 844 | seq = ntohl(seq); |
| 845 | |
| 846 | if (unlikely(seq == 0)) |
| 847 | return -EINVAL; |
| 848 | |
| 849 | if (likely(seq > x->replay.seq)) |
| 850 | return 0; |
| 851 | |
| 852 | diff = x->replay.seq - seq; |
| 853 | if (diff >= x->props.replay_window) { |
| 854 | x->stats.replay_window++; |
| 855 | return -EINVAL; |
| 856 | } |
| 857 | |
| 858 | if (x->replay.bitmap & (1U << diff)) { |
| 859 | x->stats.replay++; |
| 860 | return -EINVAL; |
| 861 | } |
| 862 | return 0; |
| 863 | } |
| 864 | EXPORT_SYMBOL(xfrm_replay_check); |
| 865 | |
| 866 | void xfrm_replay_advance(struct xfrm_state *x, u32 seq) |
| 867 | { |
| 868 | u32 diff; |
| 869 | |
| 870 | seq = ntohl(seq); |
| 871 | |
| 872 | if (seq > x->replay.seq) { |
| 873 | diff = seq - x->replay.seq; |
| 874 | if (diff < x->props.replay_window) |
| 875 | x->replay.bitmap = ((x->replay.bitmap) << diff) | 1; |
| 876 | else |
| 877 | x->replay.bitmap = 1; |
| 878 | x->replay.seq = seq; |
| 879 | } else { |
| 880 | diff = x->replay.seq - seq; |
| 881 | x->replay.bitmap |= (1U << diff); |
| 882 | } |
Jamal Hadi Salim | f8cd548 | 2006-03-20 19:15:11 -0800 | [diff] [blame] | 883 | |
| 884 | if (xfrm_aevent_is_on()) |
| 885 | xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | } |
| 887 | EXPORT_SYMBOL(xfrm_replay_advance); |
| 888 | |
| 889 | static struct list_head xfrm_km_list = LIST_HEAD_INIT(xfrm_km_list); |
| 890 | static DEFINE_RWLOCK(xfrm_km_lock); |
| 891 | |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 892 | 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] | 893 | { |
| 894 | struct xfrm_mgr *km; |
| 895 | |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 896 | read_lock(&xfrm_km_lock); |
| 897 | list_for_each_entry(km, &xfrm_km_list, list) |
| 898 | if (km->notify_policy) |
| 899 | km->notify_policy(xp, dir, c); |
| 900 | read_unlock(&xfrm_km_lock); |
| 901 | } |
| 902 | |
| 903 | void km_state_notify(struct xfrm_state *x, struct km_event *c) |
| 904 | { |
| 905 | struct xfrm_mgr *km; |
| 906 | read_lock(&xfrm_km_lock); |
| 907 | list_for_each_entry(km, &xfrm_km_list, list) |
| 908 | if (km->notify) |
| 909 | km->notify(x, c); |
| 910 | read_unlock(&xfrm_km_lock); |
| 911 | } |
| 912 | |
| 913 | EXPORT_SYMBOL(km_policy_notify); |
| 914 | EXPORT_SYMBOL(km_state_notify); |
| 915 | |
Jamal Hadi Salim | 53bc6b4 | 2006-03-20 19:17:03 -0800 | [diff] [blame] | 916 | void km_state_expired(struct xfrm_state *x, int hard, u32 pid) |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 917 | { |
| 918 | struct km_event c; |
| 919 | |
Herbert Xu | bf08867 | 2005-06-18 22:44:00 -0700 | [diff] [blame] | 920 | c.data.hard = hard; |
Jamal Hadi Salim | 53bc6b4 | 2006-03-20 19:17:03 -0800 | [diff] [blame] | 921 | c.pid = pid; |
Herbert Xu | f60f6b8 | 2005-06-18 22:44:37 -0700 | [diff] [blame] | 922 | c.event = XFRM_MSG_EXPIRE; |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 923 | km_state_notify(x, &c); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | |
| 925 | if (hard) |
| 926 | wake_up(&km_waitq); |
| 927 | } |
| 928 | |
Jamal Hadi Salim | 53bc6b4 | 2006-03-20 19:17:03 -0800 | [diff] [blame] | 929 | EXPORT_SYMBOL(km_state_expired); |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 930 | /* |
| 931 | * We send to all registered managers regardless of failure |
| 932 | * We are happy with one success |
| 933 | */ |
Jamal Hadi Salim | 980ebd2 | 2006-03-20 19:16:40 -0800 | [diff] [blame] | 934 | int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 935 | { |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 936 | int err = -EINVAL, acqret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 937 | struct xfrm_mgr *km; |
| 938 | |
| 939 | read_lock(&xfrm_km_lock); |
| 940 | list_for_each_entry(km, &xfrm_km_list, list) { |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 941 | acqret = km->acquire(x, t, pol, XFRM_POLICY_OUT); |
| 942 | if (!acqret) |
| 943 | err = acqret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 944 | } |
| 945 | read_unlock(&xfrm_km_lock); |
| 946 | return err; |
| 947 | } |
Jamal Hadi Salim | 980ebd2 | 2006-03-20 19:16:40 -0800 | [diff] [blame] | 948 | EXPORT_SYMBOL(km_query); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 949 | |
| 950 | int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport) |
| 951 | { |
| 952 | int err = -EINVAL; |
| 953 | struct xfrm_mgr *km; |
| 954 | |
| 955 | read_lock(&xfrm_km_lock); |
| 956 | list_for_each_entry(km, &xfrm_km_list, list) { |
| 957 | if (km->new_mapping) |
| 958 | err = km->new_mapping(x, ipaddr, sport); |
| 959 | if (!err) |
| 960 | break; |
| 961 | } |
| 962 | read_unlock(&xfrm_km_lock); |
| 963 | return err; |
| 964 | } |
| 965 | EXPORT_SYMBOL(km_new_mapping); |
| 966 | |
Jamal Hadi Salim | 6c5c8ca | 2006-03-20 19:17:25 -0800 | [diff] [blame] | 967 | void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | { |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 969 | struct km_event c; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | |
Herbert Xu | bf08867 | 2005-06-18 22:44:00 -0700 | [diff] [blame] | 971 | c.data.hard = hard; |
Jamal Hadi Salim | 6c5c8ca | 2006-03-20 19:17:25 -0800 | [diff] [blame] | 972 | c.pid = pid; |
Herbert Xu | f60f6b8 | 2005-06-18 22:44:37 -0700 | [diff] [blame] | 973 | c.event = XFRM_MSG_POLEXPIRE; |
Jamal Hadi Salim | 26b15da | 2005-06-18 22:42:13 -0700 | [diff] [blame] | 974 | km_policy_notify(pol, dir, &c); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | |
| 976 | if (hard) |
| 977 | wake_up(&km_waitq); |
| 978 | } |
| 979 | |
| 980 | int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) |
| 981 | { |
| 982 | int err; |
| 983 | u8 *data; |
| 984 | struct xfrm_mgr *km; |
| 985 | struct xfrm_policy *pol = NULL; |
| 986 | |
| 987 | if (optlen <= 0 || optlen > PAGE_SIZE) |
| 988 | return -EMSGSIZE; |
| 989 | |
| 990 | data = kmalloc(optlen, GFP_KERNEL); |
| 991 | if (!data) |
| 992 | return -ENOMEM; |
| 993 | |
| 994 | err = -EFAULT; |
| 995 | if (copy_from_user(data, optval, optlen)) |
| 996 | goto out; |
| 997 | |
| 998 | err = -EINVAL; |
| 999 | read_lock(&xfrm_km_lock); |
| 1000 | list_for_each_entry(km, &xfrm_km_list, list) { |
| 1001 | pol = km->compile_policy(sk->sk_family, optname, data, |
| 1002 | optlen, &err); |
| 1003 | if (err >= 0) |
| 1004 | break; |
| 1005 | } |
| 1006 | read_unlock(&xfrm_km_lock); |
| 1007 | |
| 1008 | if (err >= 0) { |
| 1009 | xfrm_sk_policy_insert(sk, err, pol); |
| 1010 | xfrm_pol_put(pol); |
| 1011 | err = 0; |
| 1012 | } |
| 1013 | |
| 1014 | out: |
| 1015 | kfree(data); |
| 1016 | return err; |
| 1017 | } |
| 1018 | EXPORT_SYMBOL(xfrm_user_policy); |
| 1019 | |
| 1020 | int xfrm_register_km(struct xfrm_mgr *km) |
| 1021 | { |
| 1022 | write_lock_bh(&xfrm_km_lock); |
| 1023 | list_add_tail(&km->list, &xfrm_km_list); |
| 1024 | write_unlock_bh(&xfrm_km_lock); |
| 1025 | return 0; |
| 1026 | } |
| 1027 | EXPORT_SYMBOL(xfrm_register_km); |
| 1028 | |
| 1029 | int xfrm_unregister_km(struct xfrm_mgr *km) |
| 1030 | { |
| 1031 | write_lock_bh(&xfrm_km_lock); |
| 1032 | list_del(&km->list); |
| 1033 | write_unlock_bh(&xfrm_km_lock); |
| 1034 | return 0; |
| 1035 | } |
| 1036 | EXPORT_SYMBOL(xfrm_unregister_km); |
| 1037 | |
| 1038 | int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo) |
| 1039 | { |
| 1040 | int err = 0; |
| 1041 | if (unlikely(afinfo == NULL)) |
| 1042 | return -EINVAL; |
| 1043 | if (unlikely(afinfo->family >= NPROTO)) |
| 1044 | return -EAFNOSUPPORT; |
| 1045 | write_lock(&xfrm_state_afinfo_lock); |
| 1046 | if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL)) |
| 1047 | err = -ENOBUFS; |
| 1048 | else { |
| 1049 | afinfo->state_bydst = xfrm_state_bydst; |
| 1050 | afinfo->state_byspi = xfrm_state_byspi; |
| 1051 | xfrm_state_afinfo[afinfo->family] = afinfo; |
| 1052 | } |
| 1053 | write_unlock(&xfrm_state_afinfo_lock); |
| 1054 | return err; |
| 1055 | } |
| 1056 | EXPORT_SYMBOL(xfrm_state_register_afinfo); |
| 1057 | |
| 1058 | int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo) |
| 1059 | { |
| 1060 | int err = 0; |
| 1061 | if (unlikely(afinfo == NULL)) |
| 1062 | return -EINVAL; |
| 1063 | if (unlikely(afinfo->family >= NPROTO)) |
| 1064 | return -EAFNOSUPPORT; |
| 1065 | write_lock(&xfrm_state_afinfo_lock); |
| 1066 | if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) { |
| 1067 | if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo)) |
| 1068 | err = -EINVAL; |
| 1069 | else { |
| 1070 | xfrm_state_afinfo[afinfo->family] = NULL; |
| 1071 | afinfo->state_byspi = NULL; |
| 1072 | afinfo->state_bydst = NULL; |
| 1073 | } |
| 1074 | } |
| 1075 | write_unlock(&xfrm_state_afinfo_lock); |
| 1076 | return err; |
| 1077 | } |
| 1078 | EXPORT_SYMBOL(xfrm_state_unregister_afinfo); |
| 1079 | |
| 1080 | static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family) |
| 1081 | { |
| 1082 | struct xfrm_state_afinfo *afinfo; |
| 1083 | if (unlikely(family >= NPROTO)) |
| 1084 | return NULL; |
| 1085 | read_lock(&xfrm_state_afinfo_lock); |
| 1086 | afinfo = xfrm_state_afinfo[family]; |
| 1087 | if (likely(afinfo != NULL)) |
| 1088 | read_lock(&afinfo->lock); |
| 1089 | read_unlock(&xfrm_state_afinfo_lock); |
| 1090 | return afinfo; |
| 1091 | } |
| 1092 | |
| 1093 | static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo) |
| 1094 | { |
| 1095 | if (unlikely(afinfo == NULL)) |
| 1096 | return; |
| 1097 | read_unlock(&afinfo->lock); |
| 1098 | } |
| 1099 | |
| 1100 | /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */ |
| 1101 | void xfrm_state_delete_tunnel(struct xfrm_state *x) |
| 1102 | { |
| 1103 | if (x->tunnel) { |
| 1104 | struct xfrm_state *t = x->tunnel; |
| 1105 | |
| 1106 | if (atomic_read(&t->tunnel_users) == 2) |
| 1107 | xfrm_state_delete(t); |
| 1108 | atomic_dec(&t->tunnel_users); |
| 1109 | xfrm_state_put(t); |
| 1110 | x->tunnel = NULL; |
| 1111 | } |
| 1112 | } |
| 1113 | EXPORT_SYMBOL(xfrm_state_delete_tunnel); |
| 1114 | |
Herbert Xu | 80b30c1 | 2005-10-15 10:58:30 +1000 | [diff] [blame] | 1115 | /* |
| 1116 | * This function is NOT optimal. For example, with ESP it will give an |
| 1117 | * MTU that's usually two bytes short of being optimal. However, it will |
| 1118 | * usually give an answer that's a multiple of 4 provided the input is |
| 1119 | * also a multiple of 4. |
| 1120 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1121 | int xfrm_state_mtu(struct xfrm_state *x, int mtu) |
| 1122 | { |
| 1123 | int res = mtu; |
| 1124 | |
| 1125 | res -= x->props.header_len; |
| 1126 | |
| 1127 | for (;;) { |
| 1128 | int m = res; |
| 1129 | |
| 1130 | if (m < 68) |
| 1131 | return 68; |
| 1132 | |
| 1133 | spin_lock_bh(&x->lock); |
| 1134 | if (x->km.state == XFRM_STATE_VALID && |
| 1135 | x->type && x->type->get_max_size) |
| 1136 | m = x->type->get_max_size(x, m); |
| 1137 | else |
| 1138 | m += x->props.header_len; |
| 1139 | spin_unlock_bh(&x->lock); |
| 1140 | |
| 1141 | if (m <= mtu) |
| 1142 | break; |
| 1143 | res -= (m - mtu); |
| 1144 | } |
| 1145 | |
| 1146 | return res; |
| 1147 | } |
| 1148 | |
| 1149 | EXPORT_SYMBOL(xfrm_state_mtu); |
Herbert Xu | 72cb696 | 2005-06-20 13:18:08 -0700 | [diff] [blame] | 1150 | |
| 1151 | int xfrm_init_state(struct xfrm_state *x) |
| 1152 | { |
Herbert Xu | d094cd8 | 2005-06-20 13:19:41 -0700 | [diff] [blame] | 1153 | struct xfrm_state_afinfo *afinfo; |
| 1154 | int family = x->props.family; |
Herbert Xu | 72cb696 | 2005-06-20 13:18:08 -0700 | [diff] [blame] | 1155 | int err; |
| 1156 | |
Herbert Xu | d094cd8 | 2005-06-20 13:19:41 -0700 | [diff] [blame] | 1157 | err = -EAFNOSUPPORT; |
| 1158 | afinfo = xfrm_state_get_afinfo(family); |
| 1159 | if (!afinfo) |
| 1160 | goto error; |
| 1161 | |
| 1162 | err = 0; |
| 1163 | if (afinfo->init_flags) |
| 1164 | err = afinfo->init_flags(x); |
| 1165 | |
| 1166 | xfrm_state_put_afinfo(afinfo); |
| 1167 | |
| 1168 | if (err) |
| 1169 | goto error; |
| 1170 | |
| 1171 | err = -EPROTONOSUPPORT; |
| 1172 | x->type = xfrm_get_type(x->id.proto, family); |
Herbert Xu | 72cb696 | 2005-06-20 13:18:08 -0700 | [diff] [blame] | 1173 | if (x->type == NULL) |
| 1174 | goto error; |
| 1175 | |
| 1176 | err = x->type->init_state(x); |
| 1177 | if (err) |
| 1178 | goto error; |
| 1179 | |
| 1180 | x->km.state = XFRM_STATE_VALID; |
| 1181 | |
| 1182 | error: |
| 1183 | return err; |
| 1184 | } |
| 1185 | |
| 1186 | EXPORT_SYMBOL(xfrm_init_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1187 | |
| 1188 | void __init xfrm_state_init(void) |
| 1189 | { |
| 1190 | int i; |
| 1191 | |
| 1192 | for (i=0; i<XFRM_DST_HSIZE; i++) { |
| 1193 | INIT_LIST_HEAD(&xfrm_state_bydst[i]); |
| 1194 | INIT_LIST_HEAD(&xfrm_state_byspi[i]); |
| 1195 | } |
| 1196 | INIT_WORK(&xfrm_state_gc_work, xfrm_state_gc_task, NULL); |
| 1197 | } |
| 1198 | |