net/xfrm/xfrm_state.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * xfrm_state.c
   4  *
   5  * Changes:
   6  *      Mitsuru KANDA @USAGI
   7  *      Kazunori MIYAZAWA @USAGI
   8  *      Kunihiro Ishiguro <kunihiro@ipinfusion.com>
   9  *              IPv6 support
  10  *      YOSHIFUJI Hideaki @USAGI
  11  *              Split up af-specific functions
  12  *      Derek Atkins <derek@ihtfp.com>
  13  *              Add UDP Encapsulation
  14  *
  15  */
  16
  17 #include <linux/compat.h>
  18 #include <linux/workqueue.h>
  19 #include <net/xfrm.h>
  20 #include <linux/pfkeyv2.h>
  21 #include <linux/ipsec.h>
  22 #include <linux/module.h>
  23 #include <linux/cache.h>
  24 #include <linux/audit.h>
  25 #include <linux/uaccess.h>
  26 #include <linux/ktime.h>
  27 #include <linux/slab.h>
  28 #include <linux/interrupt.h>
  29 #include <linux/kernel.h>
  30
  31 #include <crypto/aead.h>
  32
  33 #include "xfrm_hash.h"
  34
  35 #define xfrm_state_deref_prot(table, net) \
  36         rcu_dereference_protected((table), lockdep_is_held(&(net)->xfrm.xfrm_state_lock))
  37
  38 static void xfrm_state_gc_task(struct work_struct *work);
  39
  40 /* Each xfrm_state may be linked to two tables:
  41
  42    1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl)
  43    2. Hash table by (daddr,family,reqid) to find what SAs exist for given
  44       destination/tunnel endpoint. (output)
  45  */
  46
  47 static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024;
  48 static struct kmem_cache *xfrm_state_cache __ro_after_init;
  49
  50 static DECLARE_WORK(xfrm_state_gc_work, xfrm_state_gc_task);
  51 static HLIST_HEAD(xfrm_state_gc_list);
  52
  53 static inline bool xfrm_state_hold_rcu(struct xfrm_state __rcu *x)
  54 {
  55         return refcount_inc_not_zero(&x->refcnt);
  56 }
  57
  58 static inline unsigned int xfrm_dst_hash(struct net *net,
  59                                          const xfrm_address_t *daddr,
  60                                          const xfrm_address_t *saddr,
  61                                          u32 reqid,
  62                                          unsigned short family)
  63 {
  64         return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask);
  65 }
  66
  67 static inline unsigned int xfrm_src_hash(struct net *net,
  68                                          const xfrm_address_t *daddr,
  69                                          const xfrm_address_t *saddr,
  70                                          unsigned short family)
  71 {
  72         return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask);
  73 }
  74
  75 static inline unsigned int
  76 xfrm_spi_hash(struct net *net, const xfrm_address_t *daddr,
  77               __be32 spi, u8 proto, unsigned short family)
  78 {
  79         return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask);
  80 }
  81
  82 static unsigned int xfrm_seq_hash(struct net *net, u32 seq)
  83 {
  84         return __xfrm_seq_hash(seq, net->xfrm.state_hmask);
  85 }
  86
  87 static void xfrm_hash_transfer(struct hlist_head *list,
  88                                struct hlist_head *ndsttable,
  89                                struct hlist_head *nsrctable,
  90                                struct hlist_head *nspitable,
  91                                struct hlist_head *nseqtable,
  92                                unsigned int nhashmask)
  93 {
  94         struct hlist_node *tmp;
  95         struct xfrm_state *x;
  96
  97         hlist_for_each_entry_safe(x, tmp, list, bydst) {
  98                 unsigned int h;
  99
 100                 h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr,
 101                                     x->props.reqid, x->props.family,
 102                                     nhashmask);
 103                 hlist_add_head_rcu(&x->bydst, ndsttable + h);
 104
 105                 h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr,
 106                                     x->props.family,
 107                                     nhashmask);
 108                 hlist_add_head_rcu(&x->bysrc, nsrctable + h);
 109
 110                 if (x->id.spi) {
 111                         h = __xfrm_spi_hash(&x->id.daddr, x->id.spi,
 112                                             x->id.proto, x->props.family,
 113                                             nhashmask);
 114                         hlist_add_head_rcu(&x->byspi, nspitable + h);
 115                 }
 116
 117                 if (x->km.seq) {
 118                         h = __xfrm_seq_hash(x->km.seq, nhashmask);
 119                         hlist_add_head_rcu(&x->byseq, nseqtable + h);
 120                 }
 121         }
 122 }
 123
 124 static unsigned long xfrm_hash_new_size(unsigned int state_hmask)
 125 {
 126         return ((state_hmask + 1) << 1) * sizeof(struct hlist_head);
 127 }
 128
 129 static void xfrm_hash_resize(struct work_struct *work)
 130 {
 131         struct net *net = container_of(work, struct net, xfrm.state_hash_work);
 132         struct hlist_head *ndst, *nsrc, *nspi, *nseq, *odst, *osrc, *ospi, *oseq;
 133         unsigned long nsize, osize;
 134         unsigned int nhashmask, ohashmask;
 135         int i;
 136
 137         nsize = xfrm_hash_new_size(net->xfrm.state_hmask);
 138         ndst = xfrm_hash_alloc(nsize);
 139         if (!ndst)
 140                 return;
 141         nsrc = xfrm_hash_alloc(nsize);
 142         if (!nsrc) {
 143                 xfrm_hash_free(ndst, nsize);
 144                 return;
 145         }
 146         nspi = xfrm_hash_alloc(nsize);
 147         if (!nspi) {
 148                 xfrm_hash_free(ndst, nsize);
 149                 xfrm_hash_free(nsrc, nsize);
 150                 return;
 151         }
 152         nseq = xfrm_hash_alloc(nsize);
 153         if (!nseq) {
 154                 xfrm_hash_free(ndst, nsize);
 155                 xfrm_hash_free(nsrc, nsize);
 156                 xfrm_hash_free(nspi, nsize);
 157                 return;
 158         }
 159
 160         spin_lock_bh(&net->xfrm.xfrm_state_lock);
 161         write_seqcount_begin(&net->xfrm.xfrm_state_hash_generation);
 162
 163         nhashmask = (nsize / sizeof(struct hlist_head)) - 1U;
 164         odst = xfrm_state_deref_prot(net->xfrm.state_bydst, net);
 165         for (i = net->xfrm.state_hmask; i >= 0; i--)
 166                 xfrm_hash_transfer(odst + i, ndst, nsrc, nspi, nseq, nhashmask);
 167
 168         osrc = xfrm_state_deref_prot(net->xfrm.state_bysrc, net);
 169         ospi = xfrm_state_deref_prot(net->xfrm.state_byspi, net);
 170         oseq = xfrm_state_deref_prot(net->xfrm.state_byseq, net);
 171         ohashmask = net->xfrm.state_hmask;
 172
 173         rcu_assign_pointer(net->xfrm.state_bydst, ndst);
 174         rcu_assign_pointer(net->xfrm.state_bysrc, nsrc);
 175         rcu_assign_pointer(net->xfrm.state_byspi, nspi);
 176         rcu_assign_pointer(net->xfrm.state_byseq, nseq);
 177         net->xfrm.state_hmask = nhashmask;
 178
 179         write_seqcount_end(&net->xfrm.xfrm_state_hash_generation);
 180         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 181
 182         osize = (ohashmask + 1) * sizeof(struct hlist_head);
 183
 184         synchronize_rcu();
 185
 186         xfrm_hash_free(odst, osize);
 187         xfrm_hash_free(osrc, osize);
 188         xfrm_hash_free(ospi, osize);
 189         xfrm_hash_free(oseq, osize);
 190 }
 191
 192 static DEFINE_SPINLOCK(xfrm_state_afinfo_lock);
 193 static struct xfrm_state_afinfo __rcu *xfrm_state_afinfo[NPROTO];
 194
 195 static DEFINE_SPINLOCK(xfrm_state_gc_lock);
 196
 197 int __xfrm_state_delete(struct xfrm_state *x);
 198
 199 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
 200 static bool km_is_alive(const struct km_event *c);
 201 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
 202
 203 int xfrm_register_type(const struct xfrm_type *type, unsigned short family)
 204 {
 205         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
 206         int err = 0;
 207
 208         if (!afinfo)
 209                 return -EAFNOSUPPORT;
 210
 211 #define X(afi, T, name) do {                    \
 212                 WARN_ON((afi)->type_ ## name);  \
 213                 (afi)->type_ ## name = (T);     \
 214         } while (0)
 215
 216         switch (type->proto) {
 217         case IPPROTO_COMP:
 218                 X(afinfo, type, comp);
 219                 break;
 220         case IPPROTO_AH:
 221                 X(afinfo, type, ah);
 222                 break;
 223         case IPPROTO_ESP:
 224                 X(afinfo, type, esp);
 225                 break;
 226         case IPPROTO_IPIP:
 227                 X(afinfo, type, ipip);
 228                 break;
 229         case IPPROTO_DSTOPTS:
 230                 X(afinfo, type, dstopts);
 231                 break;
 232         case IPPROTO_ROUTING:
 233                 X(afinfo, type, routing);
 234                 break;
 235         case IPPROTO_IPV6:
 236                 X(afinfo, type, ipip6);
 237                 break;
 238         default:
 239                 WARN_ON(1);
 240                 err = -EPROTONOSUPPORT;
 241                 break;
 242         }
 243 #undef X
 244         rcu_read_unlock();
 245         return err;
 246 }
 247 EXPORT_SYMBOL(xfrm_register_type);
 248
 249 void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family)
 250 {
 251         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
 252
 253         if (unlikely(afinfo == NULL))
 254                 return;
 255
 256 #define X(afi, T, name) do {                            \
 257                 WARN_ON((afi)->type_ ## name != (T));   \
 258                 (afi)->type_ ## name = NULL;            \
 259         } while (0)
 260
 261         switch (type->proto) {
 262         case IPPROTO_COMP:
 263                 X(afinfo, type, comp);
 264                 break;
 265         case IPPROTO_AH:
 266                 X(afinfo, type, ah);
 267                 break;
 268         case IPPROTO_ESP:
 269                 X(afinfo, type, esp);
 270                 break;
 271         case IPPROTO_IPIP:
 272                 X(afinfo, type, ipip);
 273                 break;
 274         case IPPROTO_DSTOPTS:
 275                 X(afinfo, type, dstopts);
 276                 break;
 277         case IPPROTO_ROUTING:
 278                 X(afinfo, type, routing);
 279                 break;
 280         case IPPROTO_IPV6:
 281                 X(afinfo, type, ipip6);
 282                 break;
 283         default:
 284                 WARN_ON(1);
 285                 break;
 286         }
 287 #undef X
 288         rcu_read_unlock();
 289 }
 290 EXPORT_SYMBOL(xfrm_unregister_type);
 291
 292 static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
 293 {
 294         const struct xfrm_type *type = NULL;
 295         struct xfrm_state_afinfo *afinfo;
 296         int modload_attempted = 0;
 297
 298 retry:
 299         afinfo = xfrm_state_get_afinfo(family);
 300         if (unlikely(afinfo == NULL))
 301                 return NULL;
 302
 303         switch (proto) {
 304         case IPPROTO_COMP:
 305                 type = afinfo->type_comp;
 306                 break;
 307         case IPPROTO_AH:
 308                 type = afinfo->type_ah;
 309                 break;
 310         case IPPROTO_ESP:
 311                 type = afinfo->type_esp;
 312                 break;
 313         case IPPROTO_IPIP:
 314                 type = afinfo->type_ipip;
 315                 break;
 316         case IPPROTO_DSTOPTS:
 317                 type = afinfo->type_dstopts;
 318                 break;
 319         case IPPROTO_ROUTING:
 320                 type = afinfo->type_routing;
 321                 break;
 322         case IPPROTO_IPV6:
 323                 type = afinfo->type_ipip6;
 324                 break;
 325         default:
 326                 break;
 327         }
 328
 329         if (unlikely(type && !try_module_get(type->owner)))
 330                 type = NULL;
 331
 332         rcu_read_unlock();
 333
 334         if (!type && !modload_attempted) {
 335                 request_module("xfrm-type-%d-%d", family, proto);
 336                 modload_attempted = 1;
 337                 goto retry;
 338         }
 339
 340         return type;
 341 }
 342
 343 static void xfrm_put_type(const struct xfrm_type *type)
 344 {
 345         module_put(type->owner);
 346 }
 347
 348 int xfrm_register_type_offload(const struct xfrm_type_offload *type,
 349                                unsigned short family)
 350 {
 351         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
 352         int err = 0;
 353
 354         if (unlikely(afinfo == NULL))
 355                 return -EAFNOSUPPORT;
 356
 357         switch (type->proto) {
 358         case IPPROTO_ESP:
 359                 WARN_ON(afinfo->type_offload_esp);
 360                 afinfo->type_offload_esp = type;
 361                 break;
 362         default:
 363                 WARN_ON(1);
 364                 err = -EPROTONOSUPPORT;
 365                 break;
 366         }
 367
 368         rcu_read_unlock();
 369         return err;
 370 }
 371 EXPORT_SYMBOL(xfrm_register_type_offload);
 372
 373 void xfrm_unregister_type_offload(const struct xfrm_type_offload *type,
 374                                   unsigned short family)
 375 {
 376         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
 377
 378         if (unlikely(afinfo == NULL))
 379                 return;
 380
 381         switch (type->proto) {
 382         case IPPROTO_ESP:
 383                 WARN_ON(afinfo->type_offload_esp != type);
 384                 afinfo->type_offload_esp = NULL;
 385                 break;
 386         default:
 387                 WARN_ON(1);
 388                 break;
 389         }
 390         rcu_read_unlock();
 391 }
 392 EXPORT_SYMBOL(xfrm_unregister_type_offload);
 393
 394 static const struct xfrm_type_offload *
 395 xfrm_get_type_offload(u8 proto, unsigned short family, bool try_load)
 396 {
 397         const struct xfrm_type_offload *type = NULL;
 398         struct xfrm_state_afinfo *afinfo;
 399
 400 retry:
 401         afinfo = xfrm_state_get_afinfo(family);
 402         if (unlikely(afinfo == NULL))
 403                 return NULL;
 404
 405         switch (proto) {
 406         case IPPROTO_ESP:
 407                 type = afinfo->type_offload_esp;
 408                 break;
 409         default:
 410                 break;
 411         }
 412
 413         if ((type && !try_module_get(type->owner)))
 414                 type = NULL;
 415
 416         rcu_read_unlock();
 417
 418         if (!type && try_load) {
 419                 request_module("xfrm-offload-%d-%d", family, proto);
 420                 try_load = false;
 421                 goto retry;
 422         }
 423
 424         return type;
 425 }
 426
 427 static void xfrm_put_type_offload(const struct xfrm_type_offload *type)
 428 {
 429         module_put(type->owner);
 430 }
 431
 432 static const struct xfrm_mode xfrm4_mode_map[XFRM_MODE_MAX] = {
 433         [XFRM_MODE_BEET] = {
 434                 .encap = XFRM_MODE_BEET,
 435                 .flags = XFRM_MODE_FLAG_TUNNEL,
 436                 .family = AF_INET,
 437         },
 438         [XFRM_MODE_TRANSPORT] = {
 439                 .encap = XFRM_MODE_TRANSPORT,
 440                 .family = AF_INET,
 441         },
 442         [XFRM_MODE_TUNNEL] = {
 443                 .encap = XFRM_MODE_TUNNEL,
 444                 .flags = XFRM_MODE_FLAG_TUNNEL,
 445                 .family = AF_INET,
 446         },
 447 };
 448
 449 static const struct xfrm_mode xfrm6_mode_map[XFRM_MODE_MAX] = {
 450         [XFRM_MODE_BEET] = {
 451                 .encap = XFRM_MODE_BEET,
 452                 .flags = XFRM_MODE_FLAG_TUNNEL,
 453                 .family = AF_INET6,
 454         },
 455         [XFRM_MODE_ROUTEOPTIMIZATION] = {
 456                 .encap = XFRM_MODE_ROUTEOPTIMIZATION,
 457                 .family = AF_INET6,
 458         },
 459         [XFRM_MODE_TRANSPORT] = {
 460                 .encap = XFRM_MODE_TRANSPORT,
 461                 .family = AF_INET6,
 462         },
 463         [XFRM_MODE_TUNNEL] = {
 464                 .encap = XFRM_MODE_TUNNEL,
 465                 .flags = XFRM_MODE_FLAG_TUNNEL,
 466                 .family = AF_INET6,
 467         },
 468 };
 469
 470 static const struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
 471 {
 472         const struct xfrm_mode *mode;
 473
 474         if (unlikely(encap >= XFRM_MODE_MAX))
 475                 return NULL;
 476
 477         switch (family) {
 478         case AF_INET:
 479                 mode = &xfrm4_mode_map[encap];
 480                 if (mode->family == family)
 481                         return mode;
 482                 break;
 483         case AF_INET6:
 484                 mode = &xfrm6_mode_map[encap];
 485                 if (mode->family == family)
 486                         return mode;
 487                 break;
 488         default:
 489                 break;
 490         }
 491
 492         return NULL;
 493 }
 494
 495 void xfrm_state_free(struct xfrm_state *x)
 496 {
 497         kmem_cache_free(xfrm_state_cache, x);
 498 }
 499 EXPORT_SYMBOL(xfrm_state_free);
 500
 501 static void ___xfrm_state_destroy(struct xfrm_state *x)
 502 {
 503         hrtimer_cancel(&x->mtimer);
 504         del_timer_sync(&x->rtimer);
 505         kfree(x->aead);
 506         kfree(x->aalg);
 507         kfree(x->ealg);
 508         kfree(x->calg);
 509         kfree(x->encap);
 510         kfree(x->coaddr);
 511         kfree(x->replay_esn);
 512         kfree(x->preplay_esn);
 513         if (x->type_offload)
 514                 xfrm_put_type_offload(x->type_offload);
 515         if (x->type) {
 516                 x->type->destructor(x);
 517                 xfrm_put_type(x->type);
 518         }
 519         if (x->xfrag.page)
 520                 put_page(x->xfrag.page);
 521         xfrm_dev_state_free(x);
 522         security_xfrm_state_free(x);
 523         xfrm_state_free(x);
 524 }
 525
 526 static void xfrm_state_gc_task(struct work_struct *work)
 527 {
 528         struct xfrm_state *x;
 529         struct hlist_node *tmp;
 530         struct hlist_head gc_list;
 531
 532         spin_lock_bh(&xfrm_state_gc_lock);
 533         hlist_move_list(&xfrm_state_gc_list, &gc_list);
 534         spin_unlock_bh(&xfrm_state_gc_lock);
 535
 536         synchronize_rcu();
 537
 538         hlist_for_each_entry_safe(x, tmp, &gc_list, gclist)
 539                 ___xfrm_state_destroy(x);
 540 }
 541
 542 static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me)
 543 {
 544         struct xfrm_state *x = container_of(me, struct xfrm_state, mtimer);
 545         enum hrtimer_restart ret = HRTIMER_NORESTART;
 546         time64_t now = ktime_get_real_seconds();
 547         time64_t next = TIME64_MAX;
 548         int warn = 0;
 549         int err = 0;
 550
 551         spin_lock(&x->lock);
 552         if (x->km.state == XFRM_STATE_DEAD)
 553                 goto out;
 554         if (x->km.state == XFRM_STATE_EXPIRED)
 555                 goto expired;
 556         if (x->lft.hard_add_expires_seconds) {
 557                 long tmo = x->lft.hard_add_expires_seconds +
 558                         x->curlft.add_time - now;
 559                 if (tmo <= 0) {
 560                         if (x->xflags & XFRM_SOFT_EXPIRE) {
 561                                 /* enter hard expire without soft expire first?!
 562                                  * setting a new date could trigger this.
 563                                  * workaround: fix x->curflt.add_time by below:
 564                                  */
 565                                 x->curlft.add_time = now - x->saved_tmo - 1;
 566                                 tmo = x->lft.hard_add_expires_seconds - x->saved_tmo;
 567                         } else
 568                                 goto expired;
 569                 }
 570                 if (tmo < next)
 571                         next = tmo;
 572         }
 573         if (x->lft.hard_use_expires_seconds) {
 574                 long tmo = x->lft.hard_use_expires_seconds +
 575                         (x->curlft.use_time ? : now) - now;
 576                 if (tmo <= 0)
 577                         goto expired;
 578                 if (tmo < next)
 579                         next = tmo;
 580         }
 581         if (x->km.dying)
 582                 goto resched;
 583         if (x->lft.soft_add_expires_seconds) {
 584                 long tmo = x->lft.soft_add_expires_seconds +
 585                         x->curlft.add_time - now;
 586                 if (tmo <= 0) {
 587                         warn = 1;
 588                         x->xflags &= ~XFRM_SOFT_EXPIRE;
 589                 } else if (tmo < next) {
 590                         next = tmo;
 591                         x->xflags |= XFRM_SOFT_EXPIRE;
 592                         x->saved_tmo = tmo;
 593                 }
 594         }
 595         if (x->lft.soft_use_expires_seconds) {
 596                 long tmo = x->lft.soft_use_expires_seconds +
 597                         (x->curlft.use_time ? : now) - now;
 598                 if (tmo <= 0)
 599                         warn = 1;
 600                 else if (tmo < next)
 601                         next = tmo;
 602         }
 603
 604         x->km.dying = warn;
 605         if (warn)
 606                 km_state_expired(x, 0, 0);
 607 resched:
 608         if (next != TIME64_MAX) {
 609                 hrtimer_forward_now(&x->mtimer, ktime_set(next, 0));
 610                 ret = HRTIMER_RESTART;
 611         }
 612
 613         goto out;
 614
 615 expired:
 616         if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0)
 617                 x->km.state = XFRM_STATE_EXPIRED;
 618
 619         err = __xfrm_state_delete(x);
 620         if (!err)
 621                 km_state_expired(x, 1, 0);
 622
 623         xfrm_audit_state_delete(x, err ? 0 : 1, true);
 624
 625 out:
 626         spin_unlock(&x->lock);
 627         return ret;
 628 }
 629
 630 static void xfrm_replay_timer_handler(struct timer_list *t);
 631
 632 struct xfrm_state *xfrm_state_alloc(struct net *net)
 633 {
 634         struct xfrm_state *x;
 635
 636         x = kmem_cache_zalloc(xfrm_state_cache, GFP_ATOMIC);
 637
 638         if (x) {
 639                 write_pnet(&x->xs_net, net);
 640                 refcount_set(&x->refcnt, 1);
 641                 atomic_set(&x->tunnel_users, 0);
 642                 INIT_LIST_HEAD(&x->km.all);
 643                 INIT_HLIST_NODE(&x->bydst);
 644                 INIT_HLIST_NODE(&x->bysrc);
 645                 INIT_HLIST_NODE(&x->byspi);
 646                 INIT_HLIST_NODE(&x->byseq);
 647                 hrtimer_init(&x->mtimer, CLOCK_BOOTTIME, HRTIMER_MODE_ABS_SOFT);
 648                 x->mtimer.function = xfrm_timer_handler;
 649                 timer_setup(&x->rtimer, xfrm_replay_timer_handler, 0);
 650                 x->curlft.add_time = ktime_get_real_seconds();
 651                 x->lft.soft_byte_limit = XFRM_INF;
 652                 x->lft.soft_packet_limit = XFRM_INF;
 653                 x->lft.hard_byte_limit = XFRM_INF;
 654                 x->lft.hard_packet_limit = XFRM_INF;
 655                 x->replay_maxage = 0;
 656                 x->replay_maxdiff = 0;
 657                 spin_lock_init(&x->lock);
 658         }
 659         return x;
 660 }
 661 EXPORT_SYMBOL(xfrm_state_alloc);
 662
 663 void __xfrm_state_destroy(struct xfrm_state *x, bool sync)
 664 {
 665         WARN_ON(x->km.state != XFRM_STATE_DEAD);
 666
 667         if (sync) {
 668                 synchronize_rcu();
 669                 ___xfrm_state_destroy(x);
 670         } else {
 671                 spin_lock_bh(&xfrm_state_gc_lock);
 672                 hlist_add_head(&x->gclist, &xfrm_state_gc_list);
 673                 spin_unlock_bh(&xfrm_state_gc_lock);
 674                 schedule_work(&xfrm_state_gc_work);
 675         }
 676 }
 677 EXPORT_SYMBOL(__xfrm_state_destroy);
 678
 679 int __xfrm_state_delete(struct xfrm_state *x)
 680 {
 681         struct net *net = xs_net(x);
 682         int err = -ESRCH;
 683
 684         if (x->km.state != XFRM_STATE_DEAD) {
 685                 x->km.state = XFRM_STATE_DEAD;
 686                 spin_lock(&net->xfrm.xfrm_state_lock);
 687                 list_del(&x->km.all);
 688                 hlist_del_rcu(&x->bydst);
 689                 hlist_del_rcu(&x->bysrc);
 690                 if (x->km.seq)
 691                         hlist_del_rcu(&x->byseq);
 692                 if (x->id.spi)
 693                         hlist_del_rcu(&x->byspi);
 694                 net->xfrm.state_num--;
 695                 spin_unlock(&net->xfrm.xfrm_state_lock);
 696
 697                 if (x->encap_sk)
 698                         sock_put(rcu_dereference_raw(x->encap_sk));
 699
 700                 xfrm_dev_state_delete(x);
 701
 702                 /* All xfrm_state objects are created by xfrm_state_alloc.
 703                  * The xfrm_state_alloc call gives a reference, and that
 704                  * is what we are dropping here.
 705                  */
 706                 xfrm_state_put(x);
 707                 err = 0;
 708         }
 709
 710         return err;
 711 }
 712 EXPORT_SYMBOL(__xfrm_state_delete);
 713
 714 int xfrm_state_delete(struct xfrm_state *x)
 715 {
 716         int err;
 717
 718         spin_lock_bh(&x->lock);
 719         err = __xfrm_state_delete(x);
 720         spin_unlock_bh(&x->lock);
 721
 722         return err;
 723 }
 724 EXPORT_SYMBOL(xfrm_state_delete);
 725
 726 #ifdef CONFIG_SECURITY_NETWORK_XFRM
 727 static inline int
 728 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
 729 {
 730         int i, err = 0;
 731
 732         for (i = 0; i <= net->xfrm.state_hmask; i++) {
 733                 struct xfrm_state *x;
 734
 735                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
 736                         if (xfrm_id_proto_match(x->id.proto, proto) &&
 737                            (err = security_xfrm_state_delete(x)) != 0) {
 738                                 xfrm_audit_state_delete(x, 0, task_valid);
 739                                 return err;
 740                         }
 741                 }
 742         }
 743
 744         return err;
 745 }
 746
 747 static inline int
 748 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid)
 749 {
 750         int i, err = 0;
 751
 752         for (i = 0; i <= net->xfrm.state_hmask; i++) {
 753                 struct xfrm_state *x;
 754                 struct xfrm_dev_offload *xso;
 755
 756                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
 757                         xso = &x->xso;
 758
 759                         if (xso->dev == dev &&
 760                            (err = security_xfrm_state_delete(x)) != 0) {
 761                                 xfrm_audit_state_delete(x, 0, task_valid);
 762                                 return err;
 763                         }
 764                 }
 765         }
 766
 767         return err;
 768 }
 769 #else
 770 static inline int
 771 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
 772 {
 773         return 0;
 774 }
 775
 776 static inline int
 777 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid)
 778 {
 779         return 0;
 780 }
 781 #endif
 782
 783 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync)
 784 {
 785         int i, err = 0, cnt = 0;
 786
 787         spin_lock_bh(&net->xfrm.xfrm_state_lock);
 788         err = xfrm_state_flush_secctx_check(net, proto, task_valid);
 789         if (err)
 790                 goto out;
 791
 792         err = -ESRCH;
 793         for (i = 0; i <= net->xfrm.state_hmask; i++) {
 794                 struct xfrm_state *x;
 795 restart:
 796                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
 797                         if (!xfrm_state_kern(x) &&
 798                             xfrm_id_proto_match(x->id.proto, proto)) {
 799                                 xfrm_state_hold(x);
 800                                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 801
 802                                 err = xfrm_state_delete(x);
 803                                 xfrm_audit_state_delete(x, err ? 0 : 1,
 804                                                         task_valid);
 805                                 if (sync)
 806                                         xfrm_state_put_sync(x);
 807                                 else
 808                                         xfrm_state_put(x);
 809                                 if (!err)
 810                                         cnt++;
 811
 812                                 spin_lock_bh(&net->xfrm.xfrm_state_lock);
 813                                 goto restart;
 814                         }
 815                 }
 816         }
 817 out:
 818         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 819         if (cnt)
 820                 err = 0;
 821
 822         return err;
 823 }
 824 EXPORT_SYMBOL(xfrm_state_flush);
 825
 826 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid)
 827 {
 828         int i, err = 0, cnt = 0;
 829
 830         spin_lock_bh(&net->xfrm.xfrm_state_lock);
 831         err = xfrm_dev_state_flush_secctx_check(net, dev, task_valid);
 832         if (err)
 833                 goto out;
 834
 835         err = -ESRCH;
 836         for (i = 0; i <= net->xfrm.state_hmask; i++) {
 837                 struct xfrm_state *x;
 838                 struct xfrm_dev_offload *xso;
 839 restart:
 840                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
 841                         xso = &x->xso;
 842
 843                         if (!xfrm_state_kern(x) && xso->dev == dev) {
 844                                 xfrm_state_hold(x);
 845                                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 846
 847                                 err = xfrm_state_delete(x);
 848                                 xfrm_audit_state_delete(x, err ? 0 : 1,
 849                                                         task_valid);
 850                                 xfrm_state_put(x);
 851                                 if (!err)
 852                                         cnt++;
 853
 854                                 spin_lock_bh(&net->xfrm.xfrm_state_lock);
 855                                 goto restart;
 856                         }
 857                 }
 858         }
 859         if (cnt)
 860                 err = 0;
 861
 862 out:
 863         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 864         return err;
 865 }
 866 EXPORT_SYMBOL(xfrm_dev_state_flush);
 867
 868 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
 869 {
 870         spin_lock_bh(&net->xfrm.xfrm_state_lock);
 871         si->sadcnt = net->xfrm.state_num;
 872         si->sadhcnt = net->xfrm.state_hmask + 1;
 873         si->sadhmcnt = xfrm_state_hashmax;
 874         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 875 }
 876 EXPORT_SYMBOL(xfrm_sad_getinfo);
 877
 878 static void
 879 __xfrm4_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
 880 {
 881         const struct flowi4 *fl4 = &fl->u.ip4;
 882
 883         sel->daddr.a4 = fl4->daddr;
 884         sel->saddr.a4 = fl4->saddr;
 885         sel->dport = xfrm_flowi_dport(fl, &fl4->uli);
 886         sel->dport_mask = htons(0xffff);
 887         sel->sport = xfrm_flowi_sport(fl, &fl4->uli);
 888         sel->sport_mask = htons(0xffff);
 889         sel->family = AF_INET;
 890         sel->prefixlen_d = 32;
 891         sel->prefixlen_s = 32;
 892         sel->proto = fl4->flowi4_proto;
 893         sel->ifindex = fl4->flowi4_oif;
 894 }
 895
 896 static void
 897 __xfrm6_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
 898 {
 899         const struct flowi6 *fl6 = &fl->u.ip6;
 900
 901         /* Initialize temporary selector matching only to current session. */
 902         *(struct in6_addr *)&sel->daddr = fl6->daddr;
 903         *(struct in6_addr *)&sel->saddr = fl6->saddr;
 904         sel->dport = xfrm_flowi_dport(fl, &fl6->uli);
 905         sel->dport_mask = htons(0xffff);
 906         sel->sport = xfrm_flowi_sport(fl, &fl6->uli);
 907         sel->sport_mask = htons(0xffff);
 908         sel->family = AF_INET6;
 909         sel->prefixlen_d = 128;
 910         sel->prefixlen_s = 128;
 911         sel->proto = fl6->flowi6_proto;
 912         sel->ifindex = fl6->flowi6_oif;
 913 }
 914
 915 static void
 916 xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl,
 917                     const struct xfrm_tmpl *tmpl,
 918                     const xfrm_address_t *daddr, const xfrm_address_t *saddr,
 919                     unsigned short family)
 920 {
 921         switch (family) {
 922         case AF_INET:
 923                 __xfrm4_init_tempsel(&x->sel, fl);
 924                 break;
 925         case AF_INET6:
 926                 __xfrm6_init_tempsel(&x->sel, fl);
 927                 break;
 928         }
 929
 930         x->id = tmpl->id;
 931
 932         switch (tmpl->encap_family) {
 933         case AF_INET:
 934                 if (x->id.daddr.a4 == 0)
 935                         x->id.daddr.a4 = daddr->a4;
 936                 x->props.saddr = tmpl->saddr;
 937                 if (x->props.saddr.a4 == 0)
 938                         x->props.saddr.a4 = saddr->a4;
 939                 break;
 940         case AF_INET6:
 941                 if (ipv6_addr_any((struct in6_addr *)&x->id.daddr))
 942                         memcpy(&x->id.daddr, daddr, sizeof(x->sel.daddr));
 943                 memcpy(&x->props.saddr, &tmpl->saddr, sizeof(x->props.saddr));
 944                 if (ipv6_addr_any((struct in6_addr *)&x->props.saddr))
 945                         memcpy(&x->props.saddr, saddr, sizeof(x->props.saddr));
 946                 break;
 947         }
 948
 949         x->props.mode = tmpl->mode;
 950         x->props.reqid = tmpl->reqid;
 951         x->props.family = tmpl->encap_family;
 952 }
 953
 954 static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark,
 955                                               const xfrm_address_t *daddr,
 956                                               __be32 spi, u8 proto,
 957                                               unsigned short family)
 958 {
 959         unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
 960         struct xfrm_state *x;
 961
 962         hlist_for_each_entry_rcu(x, net->xfrm.state_byspi + h, byspi) {
 963                 if (x->props.family != family ||
 964                     x->id.spi       != spi ||
 965                     x->id.proto     != proto ||
 966                     !xfrm_addr_equal(&x->id.daddr, daddr, family))
 967                         continue;
 968
 969                 if ((mark & x->mark.m) != x->mark.v)
 970                         continue;
 971                 if (!xfrm_state_hold_rcu(x))
 972                         continue;
 973                 return x;
 974         }
 975
 976         return NULL;
 977 }
 978
 979 static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark,
 980                                                      const xfrm_address_t *daddr,
 981                                                      const xfrm_address_t *saddr,
 982                                                      u8 proto, unsigned short family)
 983 {
 984         unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
 985         struct xfrm_state *x;
 986
 987         hlist_for_each_entry_rcu(x, net->xfrm.state_bysrc + h, bysrc) {
 988                 if (x->props.family != family ||
 989                     x->id.proto     != proto ||
 990                     !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
 991                     !xfrm_addr_equal(&x->props.saddr, saddr, family))
 992                         continue;
 993
 994                 if ((mark & x->mark.m) != x->mark.v)
 995                         continue;
 996                 if (!xfrm_state_hold_rcu(x))
 997                         continue;
 998                 return x;
 999         }
1000
1001         return NULL;
1002 }
1003
1004 static inline struct xfrm_state *
1005 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
1006 {
1007         struct net *net = xs_net(x);
1008         u32 mark = x->mark.v & x->mark.m;
1009
1010         if (use_spi)
1011                 return __xfrm_state_lookup(net, mark, &x->id.daddr,
1012                                            x->id.spi, x->id.proto, family);
1013         else
1014                 return __xfrm_state_lookup_byaddr(net, mark,
1015                                                   &x->id.daddr,
1016                                                   &x->props.saddr,
1017                                                   x->id.proto, family);
1018 }
1019
1020 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
1021 {
1022         if (have_hash_collision &&
1023             (net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
1024             net->xfrm.state_num > net->xfrm.state_hmask)
1025                 schedule_work(&net->xfrm.state_hash_work);
1026 }
1027
1028 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
1029                                const struct flowi *fl, unsigned short family,
1030                                struct xfrm_state **best, int *acq_in_progress,
1031                                int *error)
1032 {
1033         /* Resolution logic:
1034          * 1. There is a valid state with matching selector. Done.
1035          * 2. Valid state with inappropriate selector. Skip.
1036          *
1037          * Entering area of "sysdeps".
1038          *
1039          * 3. If state is not valid, selector is temporary, it selects
1040          *    only session which triggered previous resolution. Key
1041          *    manager will do something to install a state with proper
1042          *    selector.
1043          */
1044         if (x->km.state == XFRM_STATE_VALID) {
1045                 if ((x->sel.family &&
1046                      (x->sel.family != family ||
1047                       !xfrm_selector_match(&x->sel, fl, family))) ||
1048                     !security_xfrm_state_pol_flow_match(x, pol,
1049                                                         &fl->u.__fl_common))
1050                         return;
1051
1052                 if (!*best ||
1053                     (*best)->km.dying > x->km.dying ||
1054                     ((*best)->km.dying == x->km.dying &&
1055                      (*best)->curlft.add_time < x->curlft.add_time))
1056                         *best = x;
1057         } else if (x->km.state == XFRM_STATE_ACQ) {
1058                 *acq_in_progress = 1;
1059         } else if (x->km.state == XFRM_STATE_ERROR ||
1060                    x->km.state == XFRM_STATE_EXPIRED) {
1061                 if ((!x->sel.family ||
1062                      (x->sel.family == family &&
1063                       xfrm_selector_match(&x->sel, fl, family))) &&
1064                     security_xfrm_state_pol_flow_match(x, pol,
1065                                                        &fl->u.__fl_common))
1066                         *error = -ESRCH;
1067         }
1068 }
1069
1070 struct xfrm_state *
1071 xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1072                 const struct flowi *fl, struct xfrm_tmpl *tmpl,
1073                 struct xfrm_policy *pol, int *err,
1074                 unsigned short family, u32 if_id)
1075 {
1076         static xfrm_address_t saddr_wildcard = { };
1077         struct net *net = xp_net(pol);
1078         unsigned int h, h_wildcard;
1079         struct xfrm_state *x, *x0, *to_put;
1080         int acquire_in_progress = 0;
1081         int error = 0;
1082         struct xfrm_state *best = NULL;
1083         u32 mark = pol->mark.v & pol->mark.m;
1084         unsigned short encap_family = tmpl->encap_family;
1085         unsigned int sequence;
1086         struct km_event c;
1087
1088         to_put = NULL;
1089
1090         sequence = read_seqcount_begin(&net->xfrm.xfrm_state_hash_generation);
1091
1092         rcu_read_lock();
1093         h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family);
1094         hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h, bydst) {
1095                 if (x->props.family == encap_family &&
1096                     x->props.reqid == tmpl->reqid &&
1097                     (mark & x->mark.m) == x->mark.v &&
1098                     x->if_id == if_id &&
1099                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
1100                     xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
1101                     tmpl->mode == x->props.mode &&
1102                     tmpl->id.proto == x->id.proto &&
1103                     (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
1104                         xfrm_state_look_at(pol, x, fl, family,
1105                                            &best, &acquire_in_progress, &error);
1106         }
1107         if (best || acquire_in_progress)
1108                 goto found;
1109
1110         h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family);
1111         hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h_wildcard, bydst) {
1112                 if (x->props.family == encap_family &&
1113                     x->props.reqid == tmpl->reqid &&
1114                     (mark & x->mark.m) == x->mark.v &&
1115                     x->if_id == if_id &&
1116                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
1117                     xfrm_addr_equal(&x->id.daddr, daddr, encap_family) &&
1118                     tmpl->mode == x->props.mode &&
1119                     tmpl->id.proto == x->id.proto &&
1120                     (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
1121                         xfrm_state_look_at(pol, x, fl, family,
1122                                            &best, &acquire_in_progress, &error);
1123         }
1124
1125 found:
1126         x = best;
1127         if (!x && !error && !acquire_in_progress) {
1128                 if (tmpl->id.spi &&
1129                     (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi,
1130                                               tmpl->id.proto, encap_family)) != NULL) {
1131                         to_put = x0;
1132                         error = -EEXIST;
1133                         goto out;
1134                 }
1135
1136                 c.net = net;
1137                 /* If the KMs have no listeners (yet...), avoid allocating an SA
1138                  * for each and every packet - garbage collection might not
1139                  * handle the flood.
1140                  */
1141                 if (!km_is_alive(&c)) {
1142                         error = -ESRCH;
1143                         goto out;
1144                 }
1145
1146                 x = xfrm_state_alloc(net);
1147                 if (x == NULL) {
1148                         error = -ENOMEM;
1149                         goto out;
1150                 }
1151                 /* Initialize temporary state matching only
1152                  * to current session. */
1153                 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family);
1154                 memcpy(&x->mark, &pol->mark, sizeof(x->mark));
1155                 x->if_id = if_id;
1156
1157                 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid);
1158                 if (error) {
1159                         x->km.state = XFRM_STATE_DEAD;
1160                         to_put = x;
1161                         x = NULL;
1162                         goto out;
1163                 }
1164
1165                 if (km_query(x, tmpl, pol) == 0) {
1166                         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1167                         x->km.state = XFRM_STATE_ACQ;
1168                         list_add(&x->km.all, &net->xfrm.state_all);
1169                         hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
1170                         h = xfrm_src_hash(net, daddr, saddr, encap_family);
1171                         hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
1172                         if (x->id.spi) {
1173                                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family);
1174                                 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
1175                         }
1176                         if (x->km.seq) {
1177                                 h = xfrm_seq_hash(net, x->km.seq);
1178                                 hlist_add_head_rcu(&x->byseq, net->xfrm.state_byseq + h);
1179                         }
1180                         x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1181                         hrtimer_start(&x->mtimer,
1182                                       ktime_set(net->xfrm.sysctl_acq_expires, 0),
1183                                       HRTIMER_MODE_REL_SOFT);
1184                         net->xfrm.state_num++;
1185                         xfrm_hash_grow_check(net, x->bydst.next != NULL);
1186                         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1187                 } else {
1188                         x->km.state = XFRM_STATE_DEAD;
1189                         to_put = x;
1190                         x = NULL;
1191                         error = -ESRCH;
1192                 }
1193         }
1194 out:
1195         if (x) {
1196                 if (!xfrm_state_hold_rcu(x)) {
1197                         *err = -EAGAIN;
1198                         x = NULL;
1199                 }
1200         } else {
1201                 *err = acquire_in_progress ? -EAGAIN : error;
1202         }
1203         rcu_read_unlock();
1204         if (to_put)
1205                 xfrm_state_put(to_put);
1206
1207         if (read_seqcount_retry(&net->xfrm.xfrm_state_hash_generation, sequence)) {
1208                 *err = -EAGAIN;
1209                 if (x) {
1210                         xfrm_state_put(x);
1211                         x = NULL;
1212                 }
1213         }
1214
1215         return x;
1216 }
1217
1218 struct xfrm_state *
1219 xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1220                     xfrm_address_t *daddr, xfrm_address_t *saddr,
1221                     unsigned short family, u8 mode, u8 proto, u32 reqid)
1222 {
1223         unsigned int h;
1224         struct xfrm_state *rx = NULL, *x = NULL;
1225
1226         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1227         h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1228         hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1229                 if (x->props.family == family &&
1230                     x->props.reqid == reqid &&
1231                     (mark & x->mark.m) == x->mark.v &&
1232                     x->if_id == if_id &&
1233                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
1234                     xfrm_state_addr_check(x, daddr, saddr, family) &&
1235                     mode == x->props.mode &&
1236                     proto == x->id.proto &&
1237                     x->km.state == XFRM_STATE_VALID) {
1238                         rx = x;
1239                         break;
1240                 }
1241         }
1242
1243         if (rx)
1244                 xfrm_state_hold(rx);
1245         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1246
1247
1248         return rx;
1249 }
1250 EXPORT_SYMBOL(xfrm_stateonly_find);
1251
1252 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1253                                               unsigned short family)
1254 {
1255         struct xfrm_state *x;
1256         struct xfrm_state_walk *w;
1257
1258         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1259         list_for_each_entry(w, &net->xfrm.state_all, all) {
1260                 x = container_of(w, struct xfrm_state, km);
1261                 if (x->props.family != family ||
1262                         x->id.spi != spi)
1263                         continue;
1264
1265                 xfrm_state_hold(x);
1266                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1267                 return x;
1268         }
1269         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1270         return NULL;
1271 }
1272 EXPORT_SYMBOL(xfrm_state_lookup_byspi);
1273
1274 static void __xfrm_state_insert(struct xfrm_state *x)
1275 {
1276         struct net *net = xs_net(x);
1277         unsigned int h;
1278
1279         list_add(&x->km.all, &net->xfrm.state_all);
1280
1281         h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
1282                           x->props.reqid, x->props.family);
1283         hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
1284
1285         h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
1286         hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
1287
1288         if (x->id.spi) {
1289                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
1290                                   x->props.family);
1291
1292                 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
1293         }
1294
1295         if (x->km.seq) {
1296                 h = xfrm_seq_hash(net, x->km.seq);
1297
1298                 hlist_add_head_rcu(&x->byseq, net->xfrm.state_byseq + h);
1299         }
1300
1301         hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL_SOFT);
1302         if (x->replay_maxage)
1303                 mod_timer(&x->rtimer, jiffies + x->replay_maxage);
1304
1305         net->xfrm.state_num++;
1306
1307         xfrm_hash_grow_check(net, x->bydst.next != NULL);
1308 }
1309
1310 /* net->xfrm.xfrm_state_lock is held */
1311 static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
1312 {
1313         struct net *net = xs_net(xnew);
1314         unsigned short family = xnew->props.family;
1315         u32 reqid = xnew->props.reqid;
1316         struct xfrm_state *x;
1317         unsigned int h;
1318         u32 mark = xnew->mark.v & xnew->mark.m;
1319         u32 if_id = xnew->if_id;
1320
1321         h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
1322         hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1323                 if (x->props.family     == family &&
1324                     x->props.reqid      == reqid &&
1325                     x->if_id            == if_id &&
1326                     (mark & x->mark.m) == x->mark.v &&
1327                     xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) &&
1328                     xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family))
1329                         x->genid++;
1330         }
1331 }
1332
1333 void xfrm_state_insert(struct xfrm_state *x)
1334 {
1335         struct net *net = xs_net(x);
1336
1337         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1338         __xfrm_state_bump_genids(x);
1339         __xfrm_state_insert(x);
1340         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1341 }
1342 EXPORT_SYMBOL(xfrm_state_insert);
1343
1344 /* net->xfrm.xfrm_state_lock is held */
1345 static struct xfrm_state *__find_acq_core(struct net *net,
1346                                           const struct xfrm_mark *m,
1347                                           unsigned short family, u8 mode,
1348                                           u32 reqid, u32 if_id, u8 proto,
1349                                           const xfrm_address_t *daddr,
1350                                           const xfrm_address_t *saddr,
1351                                           int create)
1352 {
1353         unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1354         struct xfrm_state *x;
1355         u32 mark = m->v & m->m;
1356
1357         hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1358                 if (x->props.reqid  != reqid ||
1359                     x->props.mode   != mode ||
1360                     x->props.family != family ||
1361                     x->km.state     != XFRM_STATE_ACQ ||
1362                     x->id.spi       != 0 ||
1363                     x->id.proto     != proto ||
1364                     (mark & x->mark.m) != x->mark.v ||
1365                     !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
1366                     !xfrm_addr_equal(&x->props.saddr, saddr, family))
1367                         continue;
1368
1369                 xfrm_state_hold(x);
1370                 return x;
1371         }
1372
1373         if (!create)
1374                 return NULL;
1375
1376         x = xfrm_state_alloc(net);
1377         if (likely(x)) {
1378                 switch (family) {
1379                 case AF_INET:
1380                         x->sel.daddr.a4 = daddr->a4;
1381                         x->sel.saddr.a4 = saddr->a4;
1382                         x->sel.prefixlen_d = 32;
1383                         x->sel.prefixlen_s = 32;
1384                         x->props.saddr.a4 = saddr->a4;
1385                         x->id.daddr.a4 = daddr->a4;
1386                         break;
1387
1388                 case AF_INET6:
1389                         x->sel.daddr.in6 = daddr->in6;
1390                         x->sel.saddr.in6 = saddr->in6;
1391                         x->sel.prefixlen_d = 128;
1392                         x->sel.prefixlen_s = 128;
1393                         x->props.saddr.in6 = saddr->in6;
1394                         x->id.daddr.in6 = daddr->in6;
1395                         break;
1396                 }
1397
1398                 x->km.state = XFRM_STATE_ACQ;
1399                 x->id.proto = proto;
1400                 x->props.family = family;
1401                 x->props.mode = mode;
1402                 x->props.reqid = reqid;
1403                 x->if_id = if_id;
1404                 x->mark.v = m->v;
1405                 x->mark.m = m->m;
1406                 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1407                 xfrm_state_hold(x);
1408                 hrtimer_start(&x->mtimer,
1409                               ktime_set(net->xfrm.sysctl_acq_expires, 0),
1410                               HRTIMER_MODE_REL_SOFT);
1411                 list_add(&x->km.all, &net->xfrm.state_all);
1412                 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
1413                 h = xfrm_src_hash(net, daddr, saddr, family);
1414                 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
1415
1416                 net->xfrm.state_num++;
1417
1418                 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1419         }
1420
1421         return x;
1422 }
1423
1424 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1425
1426 int xfrm_state_add(struct xfrm_state *x)
1427 {
1428         struct net *net = xs_net(x);
1429         struct xfrm_state *x1, *to_put;
1430         int family;
1431         int err;
1432         u32 mark = x->mark.v & x->mark.m;
1433         int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1434
1435         family = x->props.family;
1436
1437         to_put = NULL;
1438
1439         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1440
1441         x1 = __xfrm_state_locate(x, use_spi, family);
1442         if (x1) {
1443                 to_put = x1;
1444                 x1 = NULL;
1445                 err = -EEXIST;
1446                 goto out;
1447         }
1448
1449         if (use_spi && x->km.seq) {
1450                 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq);
1451                 if (x1 && ((x1->id.proto != x->id.proto) ||
1452                     !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) {
1453                         to_put = x1;
1454                         x1 = NULL;
1455                 }
1456         }
1457
1458         if (use_spi && !x1)
1459                 x1 = __find_acq_core(net, &x->mark, family, x->props.mode,
1460                                      x->props.reqid, x->if_id, x->id.proto,
1461                                      &x->id.daddr, &x->props.saddr, 0);
1462
1463         __xfrm_state_bump_genids(x);
1464         __xfrm_state_insert(x);
1465         err = 0;
1466
1467 out:
1468         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1469
1470         if (x1) {
1471                 xfrm_state_delete(x1);
1472                 xfrm_state_put(x1);
1473         }
1474
1475         if (to_put)
1476                 xfrm_state_put(to_put);
1477
1478         return err;
1479 }
1480 EXPORT_SYMBOL(xfrm_state_add);
1481
1482 #ifdef CONFIG_XFRM_MIGRATE
1483 static inline int clone_security(struct xfrm_state *x, struct xfrm_sec_ctx *security)
1484 {
1485         struct xfrm_user_sec_ctx *uctx;
1486         int size = sizeof(*uctx) + security->ctx_len;
1487         int err;
1488
1489         uctx = kmalloc(size, GFP_KERNEL);
1490         if (!uctx)
1491                 return -ENOMEM;
1492
1493         uctx->exttype = XFRMA_SEC_CTX;
1494         uctx->len = size;
1495         uctx->ctx_doi = security->ctx_doi;
1496         uctx->ctx_alg = security->ctx_alg;
1497         uctx->ctx_len = security->ctx_len;
1498         memcpy(uctx + 1, security->ctx_str, security->ctx_len);
1499         err = security_xfrm_state_alloc(x, uctx);
1500         kfree(uctx);
1501         if (err)
1502                 return err;
1503
1504         return 0;
1505 }
1506
1507 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig,
1508                                            struct xfrm_encap_tmpl *encap)
1509 {
1510         struct net *net = xs_net(orig);
1511         struct xfrm_state *x = xfrm_state_alloc(net);
1512         if (!x)
1513                 goto out;
1514
1515         memcpy(&x->id, &orig->id, sizeof(x->id));
1516         memcpy(&x->sel, &orig->sel, sizeof(x->sel));
1517         memcpy(&x->lft, &orig->lft, sizeof(x->lft));
1518         x->props.mode = orig->props.mode;
1519         x->props.replay_window = orig->props.replay_window;
1520         x->props.reqid = orig->props.reqid;
1521         x->props.family = orig->props.family;
1522         x->props.saddr = orig->props.saddr;
1523
1524         if (orig->aalg) {
1525                 x->aalg = xfrm_algo_auth_clone(orig->aalg);
1526                 if (!x->aalg)
1527                         goto error;
1528         }
1529         x->props.aalgo = orig->props.aalgo;
1530
1531         if (orig->aead) {
1532                 x->aead = xfrm_algo_aead_clone(orig->aead);
1533                 x->geniv = orig->geniv;
1534                 if (!x->aead)
1535                         goto error;
1536         }
1537         if (orig->ealg) {
1538                 x->ealg = xfrm_algo_clone(orig->ealg);
1539                 if (!x->ealg)
1540                         goto error;
1541         }
1542         x->props.ealgo = orig->props.ealgo;
1543
1544         if (orig->calg) {
1545                 x->calg = xfrm_algo_clone(orig->calg);
1546                 if (!x->calg)
1547                         goto error;
1548         }
1549         x->props.calgo = orig->props.calgo;
1550
1551         if (encap || orig->encap) {
1552                 if (encap)
1553                         x->encap = kmemdup(encap, sizeof(*x->encap),
1554                                         GFP_KERNEL);
1555                 else
1556                         x->encap = kmemdup(orig->encap, sizeof(*x->encap),
1557                                         GFP_KERNEL);
1558
1559                 if (!x->encap)
1560                         goto error;
1561         }
1562
1563         if (orig->security)
1564                 if (clone_security(x, orig->security))
1565                         goto error;
1566
1567         if (orig->coaddr) {
1568                 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1569                                     GFP_KERNEL);
1570                 if (!x->coaddr)
1571                         goto error;
1572         }
1573
1574         if (orig->replay_esn) {
1575                 if (xfrm_replay_clone(x, orig))
1576                         goto error;
1577         }
1578
1579         memcpy(&x->mark, &orig->mark, sizeof(x->mark));
1580         memcpy(&x->props.smark, &orig->props.smark, sizeof(x->props.smark));
1581
1582         x->props.flags = orig->props.flags;
1583         x->props.extra_flags = orig->props.extra_flags;
1584
1585         x->if_id = orig->if_id;
1586         x->tfcpad = orig->tfcpad;
1587         x->replay_maxdiff = orig->replay_maxdiff;
1588         x->replay_maxage = orig->replay_maxage;
1589         memcpy(&x->curlft, &orig->curlft, sizeof(x->curlft));
1590         x->km.state = orig->km.state;
1591         x->km.seq = orig->km.seq;
1592         x->replay = orig->replay;
1593         x->preplay = orig->preplay;
1594         x->mapping_maxage = orig->mapping_maxage;
1595         x->new_mapping = 0;
1596         x->new_mapping_sport = 0;
1597
1598         return x;
1599
1600  error:
1601         xfrm_state_put(x);
1602 out:
1603         return NULL;
1604 }
1605
1606 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net,
1607                                                 u32 if_id)
1608 {
1609         unsigned int h;
1610         struct xfrm_state *x = NULL;
1611
1612         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1613
1614         if (m->reqid) {
1615                 h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr,
1616                                   m->reqid, m->old_family);
1617                 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1618                         if (x->props.mode != m->mode ||
1619                             x->id.proto != m->proto)
1620                                 continue;
1621                         if (m->reqid && x->props.reqid != m->reqid)
1622                                 continue;
1623                         if (if_id != 0 && x->if_id != if_id)
1624                                 continue;
1625                         if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1626                                              m->old_family) ||
1627                             !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1628                                              m->old_family))
1629                                 continue;
1630                         xfrm_state_hold(x);
1631                         break;
1632                 }
1633         } else {
1634                 h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr,
1635                                   m->old_family);
1636                 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
1637                         if (x->props.mode != m->mode ||
1638                             x->id.proto != m->proto)
1639                                 continue;
1640                         if (if_id != 0 && x->if_id != if_id)
1641                                 continue;
1642                         if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1643                                              m->old_family) ||
1644                             !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1645                                              m->old_family))
1646                                 continue;
1647                         xfrm_state_hold(x);
1648                         break;
1649                 }
1650         }
1651
1652         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1653
1654         return x;
1655 }
1656 EXPORT_SYMBOL(xfrm_migrate_state_find);
1657
1658 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1659                                       struct xfrm_migrate *m,
1660                                       struct xfrm_encap_tmpl *encap)
1661 {
1662         struct xfrm_state *xc;
1663
1664         xc = xfrm_state_clone(x, encap);
1665         if (!xc)
1666                 return NULL;
1667
1668         xc->props.family = m->new_family;
1669
1670         if (xfrm_init_state(xc) < 0)
1671                 goto error;
1672
1673         memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1674         memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1675
1676         /* add state */
1677         if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) {
1678                 /* a care is needed when the destination address of the
1679                    state is to be updated as it is a part of triplet */
1680                 xfrm_state_insert(xc);
1681         } else {
1682                 if (xfrm_state_add(xc) < 0)
1683                         goto error;
1684         }
1685
1686         return xc;
1687 error:
1688         xfrm_state_put(xc);
1689         return NULL;
1690 }
1691 EXPORT_SYMBOL(xfrm_state_migrate);
1692 #endif
1693
1694 int xfrm_state_update(struct xfrm_state *x)
1695 {
1696         struct xfrm_state *x1, *to_put;
1697         int err;
1698         int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1699         struct net *net = xs_net(x);
1700
1701         to_put = NULL;
1702
1703         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1704         x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1705
1706         err = -ESRCH;
1707         if (!x1)
1708                 goto out;
1709
1710         if (xfrm_state_kern(x1)) {
1711                 to_put = x1;
1712                 err = -EEXIST;
1713                 goto out;
1714         }
1715
1716         if (x1->km.state == XFRM_STATE_ACQ) {
1717                 __xfrm_state_insert(x);
1718                 x = NULL;
1719         }
1720         err = 0;
1721
1722 out:
1723         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1724
1725         if (to_put)
1726                 xfrm_state_put(to_put);
1727
1728         if (err)
1729                 return err;
1730
1731         if (!x) {
1732                 xfrm_state_delete(x1);
1733                 xfrm_state_put(x1);
1734                 return 0;
1735         }
1736
1737         err = -EINVAL;
1738         spin_lock_bh(&x1->lock);
1739         if (likely(x1->km.state == XFRM_STATE_VALID)) {
1740                 if (x->encap && x1->encap &&
1741                     x->encap->encap_type == x1->encap->encap_type)
1742                         memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1743                 else if (x->encap || x1->encap)
1744                         goto fail;
1745
1746                 if (x->coaddr && x1->coaddr) {
1747                         memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1748                 }
1749                 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1750                         memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1751                 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1752                 x1->km.dying = 0;
1753
1754                 hrtimer_start(&x1->mtimer, ktime_set(1, 0),
1755                               HRTIMER_MODE_REL_SOFT);
1756                 if (x1->curlft.use_time)
1757                         xfrm_state_check_expire(x1);
1758
1759                 if (x->props.smark.m || x->props.smark.v || x->if_id) {
1760                         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1761
1762                         if (x->props.smark.m || x->props.smark.v)
1763                                 x1->props.smark = x->props.smark;
1764
1765                         if (x->if_id)
1766                                 x1->if_id = x->if_id;
1767
1768                         __xfrm_state_bump_genids(x1);
1769                         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1770                 }
1771
1772                 err = 0;
1773                 x->km.state = XFRM_STATE_DEAD;
1774                 __xfrm_state_put(x);
1775         }
1776
1777 fail:
1778         spin_unlock_bh(&x1->lock);
1779
1780         xfrm_state_put(x1);
1781
1782         return err;
1783 }
1784 EXPORT_SYMBOL(xfrm_state_update);
1785
1786 int xfrm_state_check_expire(struct xfrm_state *x)
1787 {
1788         if (!x->curlft.use_time)
1789                 x->curlft.use_time = ktime_get_real_seconds();
1790
1791         if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1792             x->curlft.packets >= x->lft.hard_packet_limit) {
1793                 x->km.state = XFRM_STATE_EXPIRED;
1794                 hrtimer_start(&x->mtimer, 0, HRTIMER_MODE_REL_SOFT);
1795                 return -EINVAL;
1796         }
1797
1798         if (!x->km.dying &&
1799             (x->curlft.bytes >= x->lft.soft_byte_limit ||
1800              x->curlft.packets >= x->lft.soft_packet_limit)) {
1801                 x->km.dying = 1;
1802                 km_state_expired(x, 0, 0);
1803         }
1804         return 0;
1805 }
1806 EXPORT_SYMBOL(xfrm_state_check_expire);
1807
1808 struct xfrm_state *
1809 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi,
1810                   u8 proto, unsigned short family)
1811 {
1812         struct xfrm_state *x;
1813
1814         rcu_read_lock();
1815         x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
1816         rcu_read_unlock();
1817         return x;
1818 }
1819 EXPORT_SYMBOL(xfrm_state_lookup);
1820
1821 struct xfrm_state *
1822 xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1823                          const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1824                          u8 proto, unsigned short family)
1825 {
1826         struct xfrm_state *x;
1827
1828         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1829         x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
1830         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1831         return x;
1832 }
1833 EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1834
1835 struct xfrm_state *
1836 xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid,
1837               u32 if_id, u8 proto, const xfrm_address_t *daddr,
1838               const xfrm_address_t *saddr, int create, unsigned short family)
1839 {
1840         struct xfrm_state *x;
1841
1842         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1843         x = __find_acq_core(net, mark, family, mode, reqid, if_id, proto, daddr, saddr, create);
1844         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1845
1846         return x;
1847 }
1848 EXPORT_SYMBOL(xfrm_find_acq);
1849
1850 #ifdef CONFIG_XFRM_SUB_POLICY
1851 #if IS_ENABLED(CONFIG_IPV6)
1852 /* distribution counting sort function for xfrm_state and xfrm_tmpl */
1853 static void
1854 __xfrm6_sort(void **dst, void **src, int n,
1855              int (*cmp)(const void *p), int maxclass)
1856 {
1857         int count[XFRM_MAX_DEPTH] = { };
1858         int class[XFRM_MAX_DEPTH];
1859         int i;
1860
1861         for (i = 0; i < n; i++) {
1862                 int c = cmp(src[i]);
1863
1864                 class[i] = c;
1865                 count[c]++;
1866         }
1867
1868         for (i = 2; i < maxclass; i++)
1869                 count[i] += count[i - 1];
1870
1871         for (i = 0; i < n; i++) {
1872                 dst[count[class[i] - 1]++] = src[i];
1873                 src[i] = NULL;
1874         }
1875 }
1876
1877 /* Rule for xfrm_state:
1878  *
1879  * rule 1: select IPsec transport except AH
1880  * rule 2: select MIPv6 RO or inbound trigger
1881  * rule 3: select IPsec transport AH
1882  * rule 4: select IPsec tunnel
1883  * rule 5: others
1884  */
1885 static int __xfrm6_state_sort_cmp(const void *p)
1886 {
1887         const struct xfrm_state *v = p;
1888
1889         switch (v->props.mode) {
1890         case XFRM_MODE_TRANSPORT:
1891                 if (v->id.proto != IPPROTO_AH)
1892                         return 1;
1893                 else
1894                         return 3;
1895 #if IS_ENABLED(CONFIG_IPV6_MIP6)
1896         case XFRM_MODE_ROUTEOPTIMIZATION:
1897         case XFRM_MODE_IN_TRIGGER:
1898                 return 2;
1899 #endif
1900         case XFRM_MODE_TUNNEL:
1901         case XFRM_MODE_BEET:
1902                 return 4;
1903         }
1904         return 5;
1905 }
1906
1907 /* Rule for xfrm_tmpl:
1908  *
1909  * rule 1: select IPsec transport
1910  * rule 2: select MIPv6 RO or inbound trigger
1911  * rule 3: select IPsec tunnel
1912  * rule 4: others
1913  */
1914 static int __xfrm6_tmpl_sort_cmp(const void *p)
1915 {
1916         const struct xfrm_tmpl *v = p;
1917
1918         switch (v->mode) {
1919         case XFRM_MODE_TRANSPORT:
1920                 return 1;
1921 #if IS_ENABLED(CONFIG_IPV6_MIP6)
1922         case XFRM_MODE_ROUTEOPTIMIZATION:
1923         case XFRM_MODE_IN_TRIGGER:
1924                 return 2;
1925 #endif
1926         case XFRM_MODE_TUNNEL:
1927         case XFRM_MODE_BEET:
1928                 return 3;
1929         }
1930         return 4;
1931 }
1932 #else
1933 static inline int __xfrm6_state_sort_cmp(const void *p) { return 5; }
1934 static inline int __xfrm6_tmpl_sort_cmp(const void *p) { return 4; }
1935
1936 static inline void
1937 __xfrm6_sort(void **dst, void **src, int n,
1938              int (*cmp)(const void *p), int maxclass)
1939 {
1940         int i;
1941
1942         for (i = 0; i < n; i++)
1943                 dst[i] = src[i];
1944 }
1945 #endif /* CONFIG_IPV6 */
1946
1947 void
1948 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1949                unsigned short family)
1950 {
1951         int i;
1952
1953         if (family == AF_INET6)
1954                 __xfrm6_sort((void **)dst, (void **)src, n,
1955                              __xfrm6_tmpl_sort_cmp, 5);
1956         else
1957                 for (i = 0; i < n; i++)
1958                         dst[i] = src[i];
1959 }
1960
1961 void
1962 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1963                 unsigned short family)
1964 {
1965         int i;
1966
1967         if (family == AF_INET6)
1968                 __xfrm6_sort((void **)dst, (void **)src, n,
1969                              __xfrm6_state_sort_cmp, 6);
1970         else
1971                 for (i = 0; i < n; i++)
1972                         dst[i] = src[i];
1973 }
1974 #endif
1975
1976 /* Silly enough, but I'm lazy to build resolution list */
1977
1978 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1979 {
1980         unsigned int h = xfrm_seq_hash(net, seq);
1981         struct xfrm_state *x;
1982
1983         hlist_for_each_entry_rcu(x, net->xfrm.state_byseq + h, byseq) {
1984                 if (x->km.seq == seq &&
1985                     (mark & x->mark.m) == x->mark.v &&
1986                     x->km.state == XFRM_STATE_ACQ) {
1987                         xfrm_state_hold(x);
1988                         return x;
1989                 }
1990         }
1991
1992         return NULL;
1993 }
1994
1995 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1996 {
1997         struct xfrm_state *x;
1998
1999         spin_lock_bh(&net->xfrm.xfrm_state_lock);
2000         x = __xfrm_find_acq_byseq(net, mark, seq);
2001         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2002         return x;
2003 }
2004 EXPORT_SYMBOL(xfrm_find_acq_byseq);
2005
2006 u32 xfrm_get_acqseq(void)
2007 {
2008         u32 res;
2009         static atomic_t acqseq;
2010
2011         do {
2012                 res = atomic_inc_return(&acqseq);
2013         } while (!res);
2014
2015         return res;
2016 }
2017 EXPORT_SYMBOL(xfrm_get_acqseq);
2018
2019 int verify_spi_info(u8 proto, u32 min, u32 max)
2020 {
2021         switch (proto) {
2022         case IPPROTO_AH:
2023         case IPPROTO_ESP:
2024                 break;
2025
2026         case IPPROTO_COMP:
2027                 /* IPCOMP spi is 16-bits. */
2028                 if (max >= 0x10000)
2029                         return -EINVAL;
2030                 break;
2031
2032         default:
2033                 return -EINVAL;
2034         }
2035
2036         if (min > max)
2037                 return -EINVAL;
2038
2039         return 0;
2040 }
2041 EXPORT_SYMBOL(verify_spi_info);
2042
2043 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
2044 {
2045         struct net *net = xs_net(x);
2046         unsigned int h;
2047         struct xfrm_state *x0;
2048         int err = -ENOENT;
2049         __be32 minspi = htonl(low);
2050         __be32 maxspi = htonl(high);
2051         __be32 newspi = 0;
2052         u32 mark = x->mark.v & x->mark.m;
2053
2054         spin_lock_bh(&x->lock);
2055         if (x->km.state == XFRM_STATE_DEAD)
2056                 goto unlock;
2057
2058         err = 0;
2059         if (x->id.spi)
2060                 goto unlock;
2061
2062         err = -ENOENT;
2063
2064         if (minspi == maxspi) {
2065                 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
2066                 if (x0) {
2067                         xfrm_state_put(x0);
2068                         goto unlock;
2069                 }
2070                 newspi = minspi;
2071         } else {
2072                 u32 spi = 0;
2073                 for (h = 0; h < high-low+1; h++) {
2074                         spi = low + prandom_u32()%(high-low+1);
2075                         x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
2076                         if (x0 == NULL) {
2077                                 newspi = htonl(spi);
2078                                 break;
2079                         }
2080                         xfrm_state_put(x0);
2081                 }
2082         }
2083         if (newspi) {
2084                 spin_lock_bh(&net->xfrm.xfrm_state_lock);
2085                 x->id.spi = newspi;
2086                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
2087                 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
2088                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2089
2090                 err = 0;
2091         }
2092
2093 unlock:
2094         spin_unlock_bh(&x->lock);
2095
2096         return err;
2097 }
2098 EXPORT_SYMBOL(xfrm_alloc_spi);
2099
2100 static bool __xfrm_state_filter_match(struct xfrm_state *x,
2101                                       struct xfrm_address_filter *filter)
2102 {
2103         if (filter) {
2104                 if ((filter->family == AF_INET ||
2105                      filter->family == AF_INET6) &&
2106                     x->props.family != filter->family)
2107                         return false;
2108
2109                 return addr_match(&x->props.saddr, &filter->saddr,
2110                                   filter->splen) &&
2111                        addr_match(&x->id.daddr, &filter->daddr,
2112                                   filter->dplen);
2113         }
2114         return true;
2115 }
2116
2117 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
2118                     int (*func)(struct xfrm_state *, int, void*),
2119                     void *data)
2120 {
2121         struct xfrm_state *state;
2122         struct xfrm_state_walk *x;
2123         int err = 0;
2124
2125         if (walk->seq != 0 && list_empty(&walk->all))
2126                 return 0;
2127
2128         spin_lock_bh(&net->xfrm.xfrm_state_lock);
2129         if (list_empty(&walk->all))
2130                 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
2131         else
2132                 x = list_first_entry(&walk->all, struct xfrm_state_walk, all);
2133         list_for_each_entry_from(x, &net->xfrm.state_all, all) {
2134                 if (x->state == XFRM_STATE_DEAD)
2135                         continue;
2136                 state = container_of(x, struct xfrm_state, km);
2137                 if (!xfrm_id_proto_match(state->id.proto, walk->proto))
2138                         continue;
2139                 if (!__xfrm_state_filter_match(state, walk->filter))
2140                         continue;
2141                 err = func(state, walk->seq, data);
2142                 if (err) {
2143                         list_move_tail(&walk->all, &x->all);
2144                         goto out;
2145                 }
2146                 walk->seq++;
2147         }
2148         if (walk->seq == 0) {
2149                 err = -ENOENT;
2150                 goto out;
2151         }
2152         list_del_init(&walk->all);
2153 out:
2154         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2155         return err;
2156 }
2157 EXPORT_SYMBOL(xfrm_state_walk);
2158
2159 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
2160                           struct xfrm_address_filter *filter)
2161 {
2162         INIT_LIST_HEAD(&walk->all);
2163         walk->proto = proto;
2164         walk->state = XFRM_STATE_DEAD;
2165         walk->seq = 0;
2166         walk->filter = filter;
2167 }
2168 EXPORT_SYMBOL(xfrm_state_walk_init);
2169
2170 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net)
2171 {
2172         kfree(walk->filter);
2173
2174         if (list_empty(&walk->all))
2175                 return;
2176
2177         spin_lock_bh(&net->xfrm.xfrm_state_lock);
2178         list_del(&walk->all);
2179         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2180 }
2181 EXPORT_SYMBOL(xfrm_state_walk_done);
2182
2183 static void xfrm_replay_timer_handler(struct timer_list *t)
2184 {
2185         struct xfrm_state *x = from_timer(x, t, rtimer);
2186
2187         spin_lock(&x->lock);
2188
2189         if (x->km.state == XFRM_STATE_VALID) {
2190                 if (xfrm_aevent_is_on(xs_net(x)))
2191                         xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT);
2192                 else
2193                         x->xflags |= XFRM_TIME_DEFER;
2194         }
2195
2196         spin_unlock(&x->lock);
2197 }
2198
2199 static LIST_HEAD(xfrm_km_list);
2200
2201 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2202 {
2203         struct xfrm_mgr *km;
2204
2205         rcu_read_lock();
2206         list_for_each_entry_rcu(km, &xfrm_km_list, list)
2207                 if (km->notify_policy)
2208                         km->notify_policy(xp, dir, c);
2209         rcu_read_unlock();
2210 }
2211
2212 void km_state_notify(struct xfrm_state *x, const struct km_event *c)
2213 {
2214         struct xfrm_mgr *km;
2215         rcu_read_lock();
2216         list_for_each_entry_rcu(km, &xfrm_km_list, list)
2217                 if (km->notify)
2218                         km->notify(x, c);
2219         rcu_read_unlock();
2220 }
2221
2222 EXPORT_SYMBOL(km_policy_notify);
2223 EXPORT_SYMBOL(km_state_notify);
2224
2225 void km_state_expired(struct xfrm_state *x, int hard, u32 portid)
2226 {
2227         struct km_event c;
2228
2229         c.data.hard = hard;
2230         c.portid = portid;
2231         c.event = XFRM_MSG_EXPIRE;
2232         km_state_notify(x, &c);
2233 }
2234
2235 EXPORT_SYMBOL(km_state_expired);
2236 /*
2237  * We send to all registered managers regardless of failure
2238  * We are happy with one success
2239 */
2240 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
2241 {
2242         int err = -EINVAL, acqret;
2243         struct xfrm_mgr *km;
2244
2245         rcu_read_lock();
2246         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2247                 acqret = km->acquire(x, t, pol);
2248                 if (!acqret)
2249                         err = acqret;
2250         }
2251         rcu_read_unlock();
2252         return err;
2253 }
2254 EXPORT_SYMBOL(km_query);
2255
2256 static int __km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
2257 {
2258         int err = -EINVAL;
2259         struct xfrm_mgr *km;
2260
2261         rcu_read_lock();
2262         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2263                 if (km->new_mapping)
2264                         err = km->new_mapping(x, ipaddr, sport);
2265                 if (!err)
2266                         break;
2267         }
2268         rcu_read_unlock();
2269         return err;
2270 }
2271
2272 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
2273 {
2274         int ret = 0;
2275
2276         if (x->mapping_maxage) {
2277                 if ((jiffies / HZ - x->new_mapping) > x->mapping_maxage ||
2278                     x->new_mapping_sport != sport) {
2279                         x->new_mapping_sport = sport;
2280                         x->new_mapping = jiffies / HZ;
2281                         ret = __km_new_mapping(x, ipaddr, sport);
2282                 }
2283         } else {
2284                 ret = __km_new_mapping(x, ipaddr, sport);
2285         }
2286
2287         return ret;
2288 }
2289 EXPORT_SYMBOL(km_new_mapping);
2290
2291 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid)
2292 {
2293         struct km_event c;
2294
2295         c.data.hard = hard;
2296         c.portid = portid;
2297         c.event = XFRM_MSG_POLEXPIRE;
2298         km_policy_notify(pol, dir, &c);
2299 }
2300 EXPORT_SYMBOL(km_policy_expired);
2301
2302 #ifdef CONFIG_XFRM_MIGRATE
2303 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2304                const struct xfrm_migrate *m, int num_migrate,
2305                const struct xfrm_kmaddress *k,
2306                const struct xfrm_encap_tmpl *encap)
2307 {
2308         int err = -EINVAL;
2309         int ret;
2310         struct xfrm_mgr *km;
2311
2312         rcu_read_lock();
2313         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2314                 if (km->migrate) {
2315                         ret = km->migrate(sel, dir, type, m, num_migrate, k,
2316                                           encap);
2317                         if (!ret)
2318                                 err = ret;
2319                 }
2320         }
2321         rcu_read_unlock();
2322         return err;
2323 }
2324 EXPORT_SYMBOL(km_migrate);
2325 #endif
2326
2327 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
2328 {
2329         int err = -EINVAL;
2330         int ret;
2331         struct xfrm_mgr *km;
2332
2333         rcu_read_lock();
2334         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2335                 if (km->report) {
2336                         ret = km->report(net, proto, sel, addr);
2337                         if (!ret)
2338                                 err = ret;
2339                 }
2340         }
2341         rcu_read_unlock();
2342         return err;
2343 }
2344 EXPORT_SYMBOL(km_report);
2345
2346 static bool km_is_alive(const struct km_event *c)
2347 {
2348         struct xfrm_mgr *km;
2349         bool is_alive = false;
2350
2351         rcu_read_lock();
2352         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2353                 if (km->is_alive && km->is_alive(c)) {
2354                         is_alive = true;
2355                         break;
2356                 }
2357         }
2358         rcu_read_unlock();
2359
2360         return is_alive;
2361 }
2362
2363 #if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2364 static DEFINE_SPINLOCK(xfrm_translator_lock);
2365 static struct xfrm_translator __rcu *xfrm_translator;
2366
2367 struct xfrm_translator *xfrm_get_translator(void)
2368 {
2369         struct xfrm_translator *xtr;
2370
2371         rcu_read_lock();
2372         xtr = rcu_dereference(xfrm_translator);
2373         if (unlikely(!xtr))
2374                 goto out;
2375         if (!try_module_get(xtr->owner))
2376                 xtr = NULL;
2377 out:
2378         rcu_read_unlock();
2379         return xtr;
2380 }
2381 EXPORT_SYMBOL_GPL(xfrm_get_translator);
2382
2383 void xfrm_put_translator(struct xfrm_translator *xtr)
2384 {
2385         module_put(xtr->owner);
2386 }
2387 EXPORT_SYMBOL_GPL(xfrm_put_translator);
2388
2389 int xfrm_register_translator(struct xfrm_translator *xtr)
2390 {
2391         int err = 0;
2392
2393         spin_lock_bh(&xfrm_translator_lock);
2394         if (unlikely(xfrm_translator != NULL))
2395                 err = -EEXIST;
2396         else
2397                 rcu_assign_pointer(xfrm_translator, xtr);
2398         spin_unlock_bh(&xfrm_translator_lock);
2399
2400         return err;
2401 }
2402 EXPORT_SYMBOL_GPL(xfrm_register_translator);
2403
2404 int xfrm_unregister_translator(struct xfrm_translator *xtr)
2405 {
2406         int err = 0;
2407
2408         spin_lock_bh(&xfrm_translator_lock);
2409         if (likely(xfrm_translator != NULL)) {
2410                 if (rcu_access_pointer(xfrm_translator) != xtr)
2411                         err = -EINVAL;
2412                 else
2413                         RCU_INIT_POINTER(xfrm_translator, NULL);
2414         }
2415         spin_unlock_bh(&xfrm_translator_lock);
2416         synchronize_rcu();
2417
2418         return err;
2419 }
2420 EXPORT_SYMBOL_GPL(xfrm_unregister_translator);
2421 #endif
2422
2423 int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval, int optlen)
2424 {
2425         int err;
2426         u8 *data;
2427         struct xfrm_mgr *km;
2428         struct xfrm_policy *pol = NULL;
2429
2430         if (sockptr_is_null(optval) && !optlen) {
2431                 xfrm_sk_policy_insert(sk, XFRM_POLICY_IN, NULL);
2432                 xfrm_sk_policy_insert(sk, XFRM_POLICY_OUT, NULL);
2433                 __sk_dst_reset(sk);
2434                 return 0;
2435         }
2436
2437         if (optlen <= 0 || optlen > PAGE_SIZE)
2438                 return -EMSGSIZE;
2439
2440         data = memdup_sockptr(optval, optlen);
2441         if (IS_ERR(data))
2442                 return PTR_ERR(data);
2443
2444         if (in_compat_syscall()) {
2445                 struct xfrm_translator *xtr = xfrm_get_translator();
2446
2447                 if (!xtr) {
2448                         kfree(data);
2449                         return -EOPNOTSUPP;
2450                 }
2451
2452                 err = xtr->xlate_user_policy_sockptr(&data, optlen);
2453                 xfrm_put_translator(xtr);
2454                 if (err) {
2455                         kfree(data);
2456                         return err;
2457                 }
2458         }
2459
2460         err = -EINVAL;
2461         rcu_read_lock();
2462         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2463                 pol = km->compile_policy(sk, optname, data,
2464                                          optlen, &err);
2465                 if (err >= 0)
2466                         break;
2467         }
2468         rcu_read_unlock();
2469
2470         if (err >= 0) {
2471                 xfrm_sk_policy_insert(sk, err, pol);
2472                 xfrm_pol_put(pol);
2473                 __sk_dst_reset(sk);
2474                 err = 0;
2475         }
2476
2477         kfree(data);
2478         return err;
2479 }
2480 EXPORT_SYMBOL(xfrm_user_policy);
2481
2482 static DEFINE_SPINLOCK(xfrm_km_lock);
2483
2484 void xfrm_register_km(struct xfrm_mgr *km)
2485 {
2486         spin_lock_bh(&xfrm_km_lock);
2487         list_add_tail_rcu(&km->list, &xfrm_km_list);
2488         spin_unlock_bh(&xfrm_km_lock);
2489 }
2490 EXPORT_SYMBOL(xfrm_register_km);
2491
2492 void xfrm_unregister_km(struct xfrm_mgr *km)
2493 {
2494         spin_lock_bh(&xfrm_km_lock);
2495         list_del_rcu(&km->list);
2496         spin_unlock_bh(&xfrm_km_lock);
2497         synchronize_rcu();
2498 }
2499 EXPORT_SYMBOL(xfrm_unregister_km);
2500
2501 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
2502 {
2503         int err = 0;
2504
2505         if (WARN_ON(afinfo->family >= NPROTO))
2506                 return -EAFNOSUPPORT;
2507
2508         spin_lock_bh(&xfrm_state_afinfo_lock);
2509         if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
2510                 err = -EEXIST;
2511         else
2512                 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo);
2513         spin_unlock_bh(&xfrm_state_afinfo_lock);
2514         return err;
2515 }
2516 EXPORT_SYMBOL(xfrm_state_register_afinfo);
2517
2518 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
2519 {
2520         int err = 0, family = afinfo->family;
2521
2522         if (WARN_ON(family >= NPROTO))
2523                 return -EAFNOSUPPORT;
2524
2525         spin_lock_bh(&xfrm_state_afinfo_lock);
2526         if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
2527                 if (rcu_access_pointer(xfrm_state_afinfo[family]) != afinfo)
2528                         err = -EINVAL;
2529                 else
2530                         RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL);
2531         }
2532         spin_unlock_bh(&xfrm_state_afinfo_lock);
2533         synchronize_rcu();
2534         return err;
2535 }
2536 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
2537
2538 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family)
2539 {
2540         if (unlikely(family >= NPROTO))
2541                 return NULL;
2542
2543         return rcu_dereference(xfrm_state_afinfo[family]);
2544 }
2545 EXPORT_SYMBOL_GPL(xfrm_state_afinfo_get_rcu);
2546
2547 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
2548 {
2549         struct xfrm_state_afinfo *afinfo;
2550         if (unlikely(family >= NPROTO))
2551                 return NULL;
2552         rcu_read_lock();
2553         afinfo = rcu_dereference(xfrm_state_afinfo[family]);
2554         if (unlikely(!afinfo))
2555                 rcu_read_unlock();
2556         return afinfo;
2557 }
2558
2559 void xfrm_flush_gc(void)
2560 {
2561         flush_work(&xfrm_state_gc_work);
2562 }
2563 EXPORT_SYMBOL(xfrm_flush_gc);
2564
2565 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
2566 void xfrm_state_delete_tunnel(struct xfrm_state *x)
2567 {
2568         if (x->tunnel) {
2569                 struct xfrm_state *t = x->tunnel;
2570
2571                 if (atomic_read(&t->tunnel_users) == 2)
2572                         xfrm_state_delete(t);
2573                 atomic_dec(&t->tunnel_users);
2574                 xfrm_state_put_sync(t);
2575                 x->tunnel = NULL;
2576         }
2577 }
2578 EXPORT_SYMBOL(xfrm_state_delete_tunnel);
2579
2580 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu)
2581 {
2582         const struct xfrm_type *type = READ_ONCE(x->type);
2583         struct crypto_aead *aead;
2584         u32 blksize, net_adj = 0;
2585
2586         if (x->km.state != XFRM_STATE_VALID ||
2587             !type || type->proto != IPPROTO_ESP)
2588                 return mtu - x->props.header_len;
2589
2590         aead = x->data;
2591         blksize = ALIGN(crypto_aead_blocksize(aead), 4);
2592
2593         switch (x->props.mode) {
2594         case XFRM_MODE_TRANSPORT:
2595         case XFRM_MODE_BEET:
2596                 if (x->props.family == AF_INET)
2597                         net_adj = sizeof(struct iphdr);
2598                 else if (x->props.family == AF_INET6)
2599                         net_adj = sizeof(struct ipv6hdr);
2600                 break;
2601         case XFRM_MODE_TUNNEL:
2602                 break;
2603         default:
2604                 WARN_ON_ONCE(1);
2605                 break;
2606         }
2607
2608         return ((mtu - x->props.header_len - crypto_aead_authsize(aead) -
2609                  net_adj) & ~(blksize - 1)) + net_adj - 2;
2610 }
2611 EXPORT_SYMBOL_GPL(xfrm_state_mtu);
2612
2613 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload)
2614 {
2615         const struct xfrm_mode *inner_mode;
2616         const struct xfrm_mode *outer_mode;
2617         int family = x->props.family;
2618         int err;
2619
2620         if (family == AF_INET &&
2621             READ_ONCE(xs_net(x)->ipv4.sysctl_ip_no_pmtu_disc))
2622                 x->props.flags |= XFRM_STATE_NOPMTUDISC;
2623
2624         err = -EPROTONOSUPPORT;
2625
2626         if (x->sel.family != AF_UNSPEC) {
2627                 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
2628                 if (inner_mode == NULL)
2629                         goto error;
2630
2631                 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
2632                     family != x->sel.family)
2633                         goto error;
2634
2635                 x->inner_mode = *inner_mode;
2636         } else {
2637                 const struct xfrm_mode *inner_mode_iaf;
2638                 int iafamily = AF_INET;
2639
2640                 inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
2641                 if (inner_mode == NULL)
2642                         goto error;
2643
2644                 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL))
2645                         goto error;
2646
2647                 x->inner_mode = *inner_mode;
2648
2649                 if (x->props.family == AF_INET)
2650                         iafamily = AF_INET6;
2651
2652                 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
2653                 if (inner_mode_iaf) {
2654                         if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
2655                                 x->inner_mode_iaf = *inner_mode_iaf;
2656                 }
2657         }
2658
2659         x->type = xfrm_get_type(x->id.proto, family);
2660         if (x->type == NULL)
2661                 goto error;
2662
2663         x->type_offload = xfrm_get_type_offload(x->id.proto, family, offload);
2664
2665         err = x->type->init_state(x);
2666         if (err)
2667                 goto error;
2668
2669         outer_mode = xfrm_get_mode(x->props.mode, family);
2670         if (!outer_mode) {
2671                 err = -EPROTONOSUPPORT;
2672                 goto error;
2673         }
2674
2675         x->outer_mode = *outer_mode;
2676         if (init_replay) {
2677                 err = xfrm_init_replay(x);
2678                 if (err)
2679                         goto error;
2680         }
2681
2682 error:
2683         return err;
2684 }
2685
2686 EXPORT_SYMBOL(__xfrm_init_state);
2687
2688 int xfrm_init_state(struct xfrm_state *x)
2689 {
2690         int err;
2691
2692         err = __xfrm_init_state(x, true, false);
2693         if (!err)
2694                 x->km.state = XFRM_STATE_VALID;
2695
2696         return err;
2697 }
2698
2699 EXPORT_SYMBOL(xfrm_init_state);
2700
2701 int __net_init xfrm_state_init(struct net *net)
2702 {
2703         unsigned int sz;
2704
2705         if (net_eq(net, &init_net))
2706                 xfrm_state_cache = KMEM_CACHE(xfrm_state,
2707                                               SLAB_HWCACHE_ALIGN | SLAB_PANIC);
2708
2709         INIT_LIST_HEAD(&net->xfrm.state_all);
2710
2711         sz = sizeof(struct hlist_head) * 8;
2712
2713         net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2714         if (!net->xfrm.state_bydst)
2715                 goto out_bydst;
2716         net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2717         if (!net->xfrm.state_bysrc)
2718                 goto out_bysrc;
2719         net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2720         if (!net->xfrm.state_byspi)
2721                 goto out_byspi;
2722         net->xfrm.state_byseq = xfrm_hash_alloc(sz);
2723         if (!net->xfrm.state_byseq)
2724                 goto out_byseq;
2725         net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2726
2727         net->xfrm.state_num = 0;
2728         INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2729         spin_lock_init(&net->xfrm.xfrm_state_lock);
2730         seqcount_spinlock_init(&net->xfrm.xfrm_state_hash_generation,
2731                                &net->xfrm.xfrm_state_lock);
2732         return 0;
2733
2734 out_byseq:
2735         xfrm_hash_free(net->xfrm.state_byspi, sz);
2736 out_byspi:
2737         xfrm_hash_free(net->xfrm.state_bysrc, sz);
2738 out_bysrc:
2739         xfrm_hash_free(net->xfrm.state_bydst, sz);
2740 out_bydst:
2741         return -ENOMEM;
2742 }
2743
2744 void xfrm_state_fini(struct net *net)
2745 {
2746         unsigned int sz;
2747
2748         flush_work(&net->xfrm.state_hash_work);
2749         flush_work(&xfrm_state_gc_work);
2750         xfrm_state_flush(net, 0, false, true);
2751
2752         WARN_ON(!list_empty(&net->xfrm.state_all));
2753
2754         sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2755         WARN_ON(!hlist_empty(net->xfrm.state_byseq));
2756         xfrm_hash_free(net->xfrm.state_byseq, sz);
2757         WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2758         xfrm_hash_free(net->xfrm.state_byspi, sz);
2759         WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2760         xfrm_hash_free(net->xfrm.state_bysrc, sz);
2761         WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2762         xfrm_hash_free(net->xfrm.state_bydst, sz);
2763 }
2764
2765 #ifdef CONFIG_AUDITSYSCALL
2766 static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2767                                      struct audit_buffer *audit_buf)
2768 {
2769         struct xfrm_sec_ctx *ctx = x->security;
2770         u32 spi = ntohl(x->id.spi);
2771
2772         if (ctx)
2773                 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2774                                  ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2775
2776         switch (x->props.family) {
2777         case AF_INET:
2778                 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2779                                  &x->props.saddr.a4, &x->id.daddr.a4);
2780                 break;
2781         case AF_INET6:
2782                 audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2783                                  x->props.saddr.a6, x->id.daddr.a6);
2784                 break;
2785         }
2786
2787         audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2788 }
2789
2790 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2791                                       struct audit_buffer *audit_buf)
2792 {
2793         const struct iphdr *iph4;
2794         const struct ipv6hdr *iph6;
2795
2796         switch (family) {
2797         case AF_INET:
2798                 iph4 = ip_hdr(skb);
2799                 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2800                                  &iph4->saddr, &iph4->daddr);
2801                 break;
2802         case AF_INET6:
2803                 iph6 = ipv6_hdr(skb);
2804                 audit_log_format(audit_buf,
2805                                  " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2806                                  &iph6->saddr, &iph6->daddr,
2807                                  iph6->flow_lbl[0] & 0x0f,
2808                                  iph6->flow_lbl[1],
2809                                  iph6->flow_lbl[2]);
2810                 break;
2811         }
2812 }
2813
2814 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid)
2815 {
2816         struct audit_buffer *audit_buf;
2817
2818         audit_buf = xfrm_audit_start("SAD-add");
2819         if (audit_buf == NULL)
2820                 return;
2821         xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2822         xfrm_audit_helper_sainfo(x, audit_buf);
2823         audit_log_format(audit_buf, " res=%u", result);
2824         audit_log_end(audit_buf);
2825 }
2826 EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2827
2828 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid)
2829 {
2830         struct audit_buffer *audit_buf;
2831
2832         audit_buf = xfrm_audit_start("SAD-delete");
2833         if (audit_buf == NULL)
2834                 return;
2835         xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2836         xfrm_audit_helper_sainfo(x, audit_buf);
2837         audit_log_format(audit_buf, " res=%u", result);
2838         audit_log_end(audit_buf);
2839 }
2840 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
2841
2842 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
2843                                       struct sk_buff *skb)
2844 {
2845         struct audit_buffer *audit_buf;
2846         u32 spi;
2847
2848         audit_buf = xfrm_audit_start("SA-replay-overflow");
2849         if (audit_buf == NULL)
2850                 return;
2851         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2852         /* don't record the sequence number because it's inherent in this kind
2853          * of audit message */
2854         spi = ntohl(x->id.spi);
2855         audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2856         audit_log_end(audit_buf);
2857 }
2858 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
2859
2860 void xfrm_audit_state_replay(struct xfrm_state *x,
2861                              struct sk_buff *skb, __be32 net_seq)
2862 {
2863         struct audit_buffer *audit_buf;
2864         u32 spi;
2865
2866         audit_buf = xfrm_audit_start("SA-replayed-pkt");
2867         if (audit_buf == NULL)
2868                 return;
2869         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2870         spi = ntohl(x->id.spi);
2871         audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2872                          spi, spi, ntohl(net_seq));
2873         audit_log_end(audit_buf);
2874 }
2875 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay);
2876
2877 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
2878 {
2879         struct audit_buffer *audit_buf;
2880
2881         audit_buf = xfrm_audit_start("SA-notfound");
2882         if (audit_buf == NULL)
2883                 return;
2884         xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2885         audit_log_end(audit_buf);
2886 }
2887 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
2888
2889 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
2890                                __be32 net_spi, __be32 net_seq)
2891 {
2892         struct audit_buffer *audit_buf;
2893         u32 spi;
2894
2895         audit_buf = xfrm_audit_start("SA-notfound");
2896         if (audit_buf == NULL)
2897                 return;
2898         xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2899         spi = ntohl(net_spi);
2900         audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2901                          spi, spi, ntohl(net_seq));
2902         audit_log_end(audit_buf);
2903 }
2904 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
2905
2906 void xfrm_audit_state_icvfail(struct xfrm_state *x,
2907                               struct sk_buff *skb, u8 proto)
2908 {
2909         struct audit_buffer *audit_buf;
2910         __be32 net_spi;
2911         __be32 net_seq;
2912
2913         audit_buf = xfrm_audit_start("SA-icv-failure");
2914         if (audit_buf == NULL)
2915                 return;
2916         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2917         if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
2918                 u32 spi = ntohl(net_spi);
2919                 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2920                                  spi, spi, ntohl(net_seq));
2921         }
2922         audit_log_end(audit_buf);
2923 }
2924 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
2925 #endif /* CONFIG_AUDITSYSCALL */