linux/net/xfrm/xfrm_state.c
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   1/*
   2 * xfrm_state.c
   3 *
   4 * Changes:
   5 *      Mitsuru KANDA @USAGI
   6 *      Kazunori MIYAZAWA @USAGI
   7 *      Kunihiro Ishiguro <kunihiro@ipinfusion.com>
   8 *              IPv6 support
   9 *      YOSHIFUJI Hideaki @USAGI
  10 *              Split up af-specific functions
  11 *      Derek Atkins <derek@ihtfp.com>
  12 *              Add UDP Encapsulation
  13 *
  14 */
  15
  16#include <linux/workqueue.h>
  17#include <net/xfrm.h>
  18#include <linux/pfkeyv2.h>
  19#include <linux/ipsec.h>
  20#include <linux/module.h>
  21#include <linux/cache.h>
  22#include <linux/audit.h>
  23#include <asm/uaccess.h>
  24#include <linux/ktime.h>
  25#include <linux/slab.h>
  26#include <linux/interrupt.h>
  27#include <linux/kernel.h>
  28
  29#include "xfrm_hash.h"
  30
  31/* Each xfrm_state may be linked to two tables:
  32
  33   1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl)
  34   2. Hash table by (daddr,family,reqid) to find what SAs exist for given
  35      destination/tunnel endpoint. (output)
  36 */
  37
  38static DEFINE_SPINLOCK(xfrm_state_lock);
  39
  40static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024;
  41
  42static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
  43static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo);
  44
  45static inline unsigned int xfrm_dst_hash(struct net *net,
  46                                         const xfrm_address_t *daddr,
  47                                         const xfrm_address_t *saddr,
  48                                         u32 reqid,
  49                                         unsigned short family)
  50{
  51        return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask);
  52}
  53
  54static inline unsigned int xfrm_src_hash(struct net *net,
  55                                         const xfrm_address_t *daddr,
  56                                         const xfrm_address_t *saddr,
  57                                         unsigned short family)
  58{
  59        return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask);
  60}
  61
  62static inline unsigned int
  63xfrm_spi_hash(struct net *net, const xfrm_address_t *daddr,
  64              __be32 spi, u8 proto, unsigned short family)
  65{
  66        return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask);
  67}
  68
  69static void xfrm_hash_transfer(struct hlist_head *list,
  70                               struct hlist_head *ndsttable,
  71                               struct hlist_head *nsrctable,
  72                               struct hlist_head *nspitable,
  73                               unsigned int nhashmask)
  74{
  75        struct hlist_node *entry, *tmp;
  76        struct xfrm_state *x;
  77
  78        hlist_for_each_entry_safe(x, entry, tmp, list, bydst) {
  79                unsigned int h;
  80
  81                h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr,
  82                                    x->props.reqid, x->props.family,
  83                                    nhashmask);
  84                hlist_add_head(&x->bydst, ndsttable+h);
  85
  86                h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr,
  87                                    x->props.family,
  88                                    nhashmask);
  89                hlist_add_head(&x->bysrc, nsrctable+h);
  90
  91                if (x->id.spi) {
  92                        h = __xfrm_spi_hash(&x->id.daddr, x->id.spi,
  93                                            x->id.proto, x->props.family,
  94                                            nhashmask);
  95                        hlist_add_head(&x->byspi, nspitable+h);
  96                }
  97        }
  98}
  99
 100static unsigned long xfrm_hash_new_size(unsigned int state_hmask)
 101{
 102        return ((state_hmask + 1) << 1) * sizeof(struct hlist_head);
 103}
 104
 105static DEFINE_MUTEX(hash_resize_mutex);
 106
 107static void xfrm_hash_resize(struct work_struct *work)
 108{
 109        struct net *net = container_of(work, struct net, xfrm.state_hash_work);
 110        struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi;
 111        unsigned long nsize, osize;
 112        unsigned int nhashmask, ohashmask;
 113        int i;
 114
 115        mutex_lock(&hash_resize_mutex);
 116
 117        nsize = xfrm_hash_new_size(net->xfrm.state_hmask);
 118        ndst = xfrm_hash_alloc(nsize);
 119        if (!ndst)
 120                goto out_unlock;
 121        nsrc = xfrm_hash_alloc(nsize);
 122        if (!nsrc) {
 123                xfrm_hash_free(ndst, nsize);
 124                goto out_unlock;
 125        }
 126        nspi = xfrm_hash_alloc(nsize);
 127        if (!nspi) {
 128                xfrm_hash_free(ndst, nsize);
 129                xfrm_hash_free(nsrc, nsize);
 130                goto out_unlock;
 131        }
 132
 133        spin_lock_bh(&xfrm_state_lock);
 134
 135        nhashmask = (nsize / sizeof(struct hlist_head)) - 1U;
 136        for (i = net->xfrm.state_hmask; i >= 0; i--)
 137                xfrm_hash_transfer(net->xfrm.state_bydst+i, ndst, nsrc, nspi,
 138                                   nhashmask);
 139
 140        odst = net->xfrm.state_bydst;
 141        osrc = net->xfrm.state_bysrc;
 142        ospi = net->xfrm.state_byspi;
 143        ohashmask = net->xfrm.state_hmask;
 144
 145        net->xfrm.state_bydst = ndst;
 146        net->xfrm.state_bysrc = nsrc;
 147        net->xfrm.state_byspi = nspi;
 148        net->xfrm.state_hmask = nhashmask;
 149
 150        spin_unlock_bh(&xfrm_state_lock);
 151
 152        osize = (ohashmask + 1) * sizeof(struct hlist_head);
 153        xfrm_hash_free(odst, osize);
 154        xfrm_hash_free(osrc, osize);
 155        xfrm_hash_free(ospi, osize);
 156
 157out_unlock:
 158        mutex_unlock(&hash_resize_mutex);
 159}
 160
 161static DEFINE_RWLOCK(xfrm_state_afinfo_lock);
 162static struct xfrm_state_afinfo *xfrm_state_afinfo[NPROTO];
 163
 164static DEFINE_SPINLOCK(xfrm_state_gc_lock);
 165
 166int __xfrm_state_delete(struct xfrm_state *x);
 167
 168int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
 169void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
 170
 171static struct xfrm_state_afinfo *xfrm_state_lock_afinfo(unsigned int family)
 172{
 173        struct xfrm_state_afinfo *afinfo;
 174        if (unlikely(family >= NPROTO))
 175                return NULL;
 176        write_lock_bh(&xfrm_state_afinfo_lock);
 177        afinfo = xfrm_state_afinfo[family];
 178        if (unlikely(!afinfo))
 179                write_unlock_bh(&xfrm_state_afinfo_lock);
 180        return afinfo;
 181}
 182
 183static void xfrm_state_unlock_afinfo(struct xfrm_state_afinfo *afinfo)
 184        __releases(xfrm_state_afinfo_lock)
 185{
 186        write_unlock_bh(&xfrm_state_afinfo_lock);
 187}
 188
 189int xfrm_register_type(const struct xfrm_type *type, unsigned short family)
 190{
 191        struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family);
 192        const struct xfrm_type **typemap;
 193        int err = 0;
 194
 195        if (unlikely(afinfo == NULL))
 196                return -EAFNOSUPPORT;
 197        typemap = afinfo->type_map;
 198
 199        if (likely(typemap[type->proto] == NULL))
 200                typemap[type->proto] = type;
 201        else
 202                err = -EEXIST;
 203        xfrm_state_unlock_afinfo(afinfo);
 204        return err;
 205}
 206EXPORT_SYMBOL(xfrm_register_type);
 207
 208int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family)
 209{
 210        struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family);
 211        const struct xfrm_type **typemap;
 212        int err = 0;
 213
 214        if (unlikely(afinfo == NULL))
 215                return -EAFNOSUPPORT;
 216        typemap = afinfo->type_map;
 217
 218        if (unlikely(typemap[type->proto] != type))
 219                err = -ENOENT;
 220        else
 221                typemap[type->proto] = NULL;
 222        xfrm_state_unlock_afinfo(afinfo);
 223        return err;
 224}
 225EXPORT_SYMBOL(xfrm_unregister_type);
 226
 227static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
 228{
 229        struct xfrm_state_afinfo *afinfo;
 230        const struct xfrm_type **typemap;
 231        const struct xfrm_type *type;
 232        int modload_attempted = 0;
 233
 234retry:
 235        afinfo = xfrm_state_get_afinfo(family);
 236        if (unlikely(afinfo == NULL))
 237                return NULL;
 238        typemap = afinfo->type_map;
 239
 240        type = typemap[proto];
 241        if (unlikely(type && !try_module_get(type->owner)))
 242                type = NULL;
 243        if (!type && !modload_attempted) {
 244                xfrm_state_put_afinfo(afinfo);
 245                request_module("xfrm-type-%d-%d", family, proto);
 246                modload_attempted = 1;
 247                goto retry;
 248        }
 249
 250        xfrm_state_put_afinfo(afinfo);
 251        return type;
 252}
 253
 254static void xfrm_put_type(const struct xfrm_type *type)
 255{
 256        module_put(type->owner);
 257}
 258
 259int xfrm_register_mode(struct xfrm_mode *mode, int family)
 260{
 261        struct xfrm_state_afinfo *afinfo;
 262        struct xfrm_mode **modemap;
 263        int err;
 264
 265        if (unlikely(mode->encap >= XFRM_MODE_MAX))
 266                return -EINVAL;
 267
 268        afinfo = xfrm_state_lock_afinfo(family);
 269        if (unlikely(afinfo == NULL))
 270                return -EAFNOSUPPORT;
 271
 272        err = -EEXIST;
 273        modemap = afinfo->mode_map;
 274        if (modemap[mode->encap])
 275                goto out;
 276
 277        err = -ENOENT;
 278        if (!try_module_get(afinfo->owner))
 279                goto out;
 280
 281        mode->afinfo = afinfo;
 282        modemap[mode->encap] = mode;
 283        err = 0;
 284
 285out:
 286        xfrm_state_unlock_afinfo(afinfo);
 287        return err;
 288}
 289EXPORT_SYMBOL(xfrm_register_mode);
 290
 291int xfrm_unregister_mode(struct xfrm_mode *mode, int family)
 292{
 293        struct xfrm_state_afinfo *afinfo;
 294        struct xfrm_mode **modemap;
 295        int err;
 296
 297        if (unlikely(mode->encap >= XFRM_MODE_MAX))
 298                return -EINVAL;
 299
 300        afinfo = xfrm_state_lock_afinfo(family);
 301        if (unlikely(afinfo == NULL))
 302                return -EAFNOSUPPORT;
 303
 304        err = -ENOENT;
 305        modemap = afinfo->mode_map;
 306        if (likely(modemap[mode->encap] == mode)) {
 307                modemap[mode->encap] = NULL;
 308                module_put(mode->afinfo->owner);
 309                err = 0;
 310        }
 311
 312        xfrm_state_unlock_afinfo(afinfo);
 313        return err;
 314}
 315EXPORT_SYMBOL(xfrm_unregister_mode);
 316
 317static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
 318{
 319        struct xfrm_state_afinfo *afinfo;
 320        struct xfrm_mode *mode;
 321        int modload_attempted = 0;
 322
 323        if (unlikely(encap >= XFRM_MODE_MAX))
 324                return NULL;
 325
 326retry:
 327        afinfo = xfrm_state_get_afinfo(family);
 328        if (unlikely(afinfo == NULL))
 329                return NULL;
 330
 331        mode = afinfo->mode_map[encap];
 332        if (unlikely(mode && !try_module_get(mode->owner)))
 333                mode = NULL;
 334        if (!mode && !modload_attempted) {
 335                xfrm_state_put_afinfo(afinfo);
 336                request_module("xfrm-mode-%d-%d", family, encap);
 337                modload_attempted = 1;
 338                goto retry;
 339        }
 340
 341        xfrm_state_put_afinfo(afinfo);
 342        return mode;
 343}
 344
 345static void xfrm_put_mode(struct xfrm_mode *mode)
 346{
 347        module_put(mode->owner);
 348}
 349
 350static void xfrm_state_gc_destroy(struct xfrm_state *x)
 351{
 352        tasklet_hrtimer_cancel(&x->mtimer);
 353        del_timer_sync(&x->rtimer);
 354        kfree(x->aalg);
 355        kfree(x->ealg);
 356        kfree(x->calg);
 357        kfree(x->encap);
 358        kfree(x->coaddr);
 359        kfree(x->replay_esn);
 360        kfree(x->preplay_esn);
 361        if (x->inner_mode)
 362                xfrm_put_mode(x->inner_mode);
 363        if (x->inner_mode_iaf)
 364                xfrm_put_mode(x->inner_mode_iaf);
 365        if (x->outer_mode)
 366                xfrm_put_mode(x->outer_mode);
 367        if (x->type) {
 368                x->type->destructor(x);
 369                xfrm_put_type(x->type);
 370        }
 371        security_xfrm_state_free(x);
 372        kfree(x);
 373}
 374
 375static void xfrm_state_gc_task(struct work_struct *work)
 376{
 377        struct net *net = container_of(work, struct net, xfrm.state_gc_work);
 378        struct xfrm_state *x;
 379        struct hlist_node *entry, *tmp;
 380        struct hlist_head gc_list;
 381
 382        spin_lock_bh(&xfrm_state_gc_lock);
 383        hlist_move_list(&net->xfrm.state_gc_list, &gc_list);
 384        spin_unlock_bh(&xfrm_state_gc_lock);
 385
 386        hlist_for_each_entry_safe(x, entry, tmp, &gc_list, gclist)
 387                xfrm_state_gc_destroy(x);
 388
 389        wake_up(&net->xfrm.km_waitq);
 390}
 391
 392static inline unsigned long make_jiffies(long secs)
 393{
 394        if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
 395                return MAX_SCHEDULE_TIMEOUT-1;
 396        else
 397                return secs*HZ;
 398}
 399
 400static enum hrtimer_restart xfrm_timer_handler(struct hrtimer * me)
 401{
 402        struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer);
 403        struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer);
 404        struct net *net = xs_net(x);
 405        unsigned long now = get_seconds();
 406        long next = LONG_MAX;
 407        int warn = 0;
 408        int err = 0;
 409
 410        spin_lock(&x->lock);
 411        if (x->km.state == XFRM_STATE_DEAD)
 412                goto out;
 413        if (x->km.state == XFRM_STATE_EXPIRED)
 414                goto expired;
 415        if (x->lft.hard_add_expires_seconds) {
 416                long tmo = x->lft.hard_add_expires_seconds +
 417                        x->curlft.add_time - now;
 418                if (tmo <= 0) {
 419                        if (x->xflags & XFRM_SOFT_EXPIRE) {
 420                                /* enter hard expire without soft expire first?!
 421                                 * setting a new date could trigger this.
 422                                 * workarbound: fix x->curflt.add_time by below:
 423                                 */
 424                                x->curlft.add_time = now - x->saved_tmo - 1;
 425                                tmo = x->lft.hard_add_expires_seconds - x->saved_tmo;
 426                        } else
 427                                goto expired;
 428                }
 429                if (tmo < next)
 430                        next = tmo;
 431        }
 432        if (x->lft.hard_use_expires_seconds) {
 433                long tmo = x->lft.hard_use_expires_seconds +
 434                        (x->curlft.use_time ? : now) - now;
 435                if (tmo <= 0)
 436                        goto expired;
 437                if (tmo < next)
 438                        next = tmo;
 439        }
 440        if (x->km.dying)
 441                goto resched;
 442        if (x->lft.soft_add_expires_seconds) {
 443                long tmo = x->lft.soft_add_expires_seconds +
 444                        x->curlft.add_time - now;
 445                if (tmo <= 0) {
 446                        warn = 1;
 447                        x->xflags &= ~XFRM_SOFT_EXPIRE;
 448                } else if (tmo < next) {
 449                        next = tmo;
 450                        x->xflags |= XFRM_SOFT_EXPIRE;
 451                        x->saved_tmo = tmo;
 452                }
 453        }
 454        if (x->lft.soft_use_expires_seconds) {
 455                long tmo = x->lft.soft_use_expires_seconds +
 456                        (x->curlft.use_time ? : now) - now;
 457                if (tmo <= 0)
 458                        warn = 1;
 459                else if (tmo < next)
 460                        next = tmo;
 461        }
 462
 463        x->km.dying = warn;
 464        if (warn)
 465                km_state_expired(x, 0, 0);
 466resched:
 467        if (next != LONG_MAX){
 468                tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL);
 469        }
 470
 471        goto out;
 472
 473expired:
 474        if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) {
 475                x->km.state = XFRM_STATE_EXPIRED;
 476                wake_up(&net->xfrm.km_waitq);
 477                next = 2;
 478                goto resched;
 479        }
 480
 481        err = __xfrm_state_delete(x);
 482        if (!err && x->id.spi)
 483                km_state_expired(x, 1, 0);
 484
 485        xfrm_audit_state_delete(x, err ? 0 : 1,
 486                                audit_get_loginuid(current),
 487                                audit_get_sessionid(current), 0);
 488
 489out:
 490        spin_unlock(&x->lock);
 491        return HRTIMER_NORESTART;
 492}
 493
 494static void xfrm_replay_timer_handler(unsigned long data);
 495
 496struct xfrm_state *xfrm_state_alloc(struct net *net)
 497{
 498        struct xfrm_state *x;
 499
 500        x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC);
 501
 502        if (x) {
 503                write_pnet(&x->xs_net, net);
 504                atomic_set(&x->refcnt, 1);
 505                atomic_set(&x->tunnel_users, 0);
 506                INIT_LIST_HEAD(&x->km.all);
 507                INIT_HLIST_NODE(&x->bydst);
 508                INIT_HLIST_NODE(&x->bysrc);
 509                INIT_HLIST_NODE(&x->byspi);
 510                tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler, CLOCK_REALTIME, HRTIMER_MODE_ABS);
 511                setup_timer(&x->rtimer, xfrm_replay_timer_handler,
 512                                (unsigned long)x);
 513                x->curlft.add_time = get_seconds();
 514                x->lft.soft_byte_limit = XFRM_INF;
 515                x->lft.soft_packet_limit = XFRM_INF;
 516                x->lft.hard_byte_limit = XFRM_INF;
 517                x->lft.hard_packet_limit = XFRM_INF;
 518                x->replay_maxage = 0;
 519                x->replay_maxdiff = 0;
 520                x->inner_mode = NULL;
 521                x->inner_mode_iaf = NULL;
 522                spin_lock_init(&x->lock);
 523        }
 524        return x;
 525}
 526EXPORT_SYMBOL(xfrm_state_alloc);
 527
 528void __xfrm_state_destroy(struct xfrm_state *x)
 529{
 530        struct net *net = xs_net(x);
 531
 532        WARN_ON(x->km.state != XFRM_STATE_DEAD);
 533
 534        spin_lock_bh(&xfrm_state_gc_lock);
 535        hlist_add_head(&x->gclist, &net->xfrm.state_gc_list);
 536        spin_unlock_bh(&xfrm_state_gc_lock);
 537        schedule_work(&net->xfrm.state_gc_work);
 538}
 539EXPORT_SYMBOL(__xfrm_state_destroy);
 540
 541int __xfrm_state_delete(struct xfrm_state *x)
 542{
 543        struct net *net = xs_net(x);
 544        int err = -ESRCH;
 545
 546        if (x->km.state != XFRM_STATE_DEAD) {
 547                x->km.state = XFRM_STATE_DEAD;
 548                spin_lock(&xfrm_state_lock);
 549                list_del(&x->km.all);
 550                hlist_del(&x->bydst);
 551                hlist_del(&x->bysrc);
 552                if (x->id.spi)
 553                        hlist_del(&x->byspi);
 554                net->xfrm.state_num--;
 555                spin_unlock(&xfrm_state_lock);
 556
 557                /* All xfrm_state objects are created by xfrm_state_alloc.
 558                 * The xfrm_state_alloc call gives a reference, and that
 559                 * is what we are dropping here.
 560                 */
 561                xfrm_state_put(x);
 562                err = 0;
 563        }
 564
 565        return err;
 566}
 567EXPORT_SYMBOL(__xfrm_state_delete);
 568
 569int xfrm_state_delete(struct xfrm_state *x)
 570{
 571        int err;
 572
 573        spin_lock_bh(&x->lock);
 574        err = __xfrm_state_delete(x);
 575        spin_unlock_bh(&x->lock);
 576
 577        return err;
 578}
 579EXPORT_SYMBOL(xfrm_state_delete);
 580
 581#ifdef CONFIG_SECURITY_NETWORK_XFRM
 582static inline int
 583xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info)
 584{
 585        int i, err = 0;
 586
 587        for (i = 0; i <= net->xfrm.state_hmask; i++) {
 588                struct hlist_node *entry;
 589                struct xfrm_state *x;
 590
 591                hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) {
 592                        if (xfrm_id_proto_match(x->id.proto, proto) &&
 593                           (err = security_xfrm_state_delete(x)) != 0) {
 594                                xfrm_audit_state_delete(x, 0,
 595                                                        audit_info->loginuid,
 596                                                        audit_info->sessionid,
 597                                                        audit_info->secid);
 598                                return err;
 599                        }
 600                }
 601        }
 602
 603        return err;
 604}
 605#else
 606static inline int
 607xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info)
 608{
 609        return 0;
 610}
 611#endif
 612
 613int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info)
 614{
 615        int i, err = 0, cnt = 0;
 616
 617        spin_lock_bh(&xfrm_state_lock);
 618        err = xfrm_state_flush_secctx_check(net, proto, audit_info);
 619        if (err)
 620                goto out;
 621
 622        err = -ESRCH;
 623        for (i = 0; i <= net->xfrm.state_hmask; i++) {
 624                struct hlist_node *entry;
 625                struct xfrm_state *x;
 626restart:
 627                hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) {
 628                        if (!xfrm_state_kern(x) &&
 629                            xfrm_id_proto_match(x->id.proto, proto)) {
 630                                xfrm_state_hold(x);
 631                                spin_unlock_bh(&xfrm_state_lock);
 632
 633                                err = xfrm_state_delete(x);
 634                                xfrm_audit_state_delete(x, err ? 0 : 1,
 635                                                        audit_info->loginuid,
 636                                                        audit_info->sessionid,
 637                                                        audit_info->secid);
 638                                xfrm_state_put(x);
 639                                if (!err)
 640                                        cnt++;
 641
 642                                spin_lock_bh(&xfrm_state_lock);
 643                                goto restart;
 644                        }
 645                }
 646        }
 647        if (cnt)
 648                err = 0;
 649
 650out:
 651        spin_unlock_bh(&xfrm_state_lock);
 652        wake_up(&net->xfrm.km_waitq);
 653        return err;
 654}
 655EXPORT_SYMBOL(xfrm_state_flush);
 656
 657void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
 658{
 659        spin_lock_bh(&xfrm_state_lock);
 660        si->sadcnt = net->xfrm.state_num;
 661        si->sadhcnt = net->xfrm.state_hmask;
 662        si->sadhmcnt = xfrm_state_hashmax;
 663        spin_unlock_bh(&xfrm_state_lock);
 664}
 665EXPORT_SYMBOL(xfrm_sad_getinfo);
 666
 667static int
 668xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl,
 669                    const struct xfrm_tmpl *tmpl,
 670                    const xfrm_address_t *daddr, const xfrm_address_t *saddr,
 671                    unsigned short family)
 672{
 673        struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
 674        if (!afinfo)
 675                return -1;
 676        afinfo->init_tempsel(&x->sel, fl);
 677
 678        if (family != tmpl->encap_family) {
 679                xfrm_state_put_afinfo(afinfo);
 680                afinfo = xfrm_state_get_afinfo(tmpl->encap_family);
 681                if (!afinfo)
 682                        return -1;
 683        }
 684        afinfo->init_temprop(x, tmpl, daddr, saddr);
 685        xfrm_state_put_afinfo(afinfo);
 686        return 0;
 687}
 688
 689static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark,
 690                                              const xfrm_address_t *daddr,
 691                                              __be32 spi, u8 proto,
 692                                              unsigned short family)
 693{
 694        unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
 695        struct xfrm_state *x;
 696        struct hlist_node *entry;
 697
 698        hlist_for_each_entry(x, entry, net->xfrm.state_byspi+h, byspi) {
 699                if (x->props.family != family ||
 700                    x->id.spi       != spi ||
 701                    x->id.proto     != proto ||
 702                    xfrm_addr_cmp(&x->id.daddr, daddr, family))
 703                        continue;
 704
 705                if ((mark & x->mark.m) != x->mark.v)
 706                        continue;
 707                xfrm_state_hold(x);
 708                return x;
 709        }
 710
 711        return NULL;
 712}
 713
 714static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark,
 715                                                     const xfrm_address_t *daddr,
 716                                                     const xfrm_address_t *saddr,
 717                                                     u8 proto, unsigned short family)
 718{
 719        unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
 720        struct xfrm_state *x;
 721        struct hlist_node *entry;
 722
 723        hlist_for_each_entry(x, entry, net->xfrm.state_bysrc+h, bysrc) {
 724                if (x->props.family != family ||
 725                    x->id.proto     != proto ||
 726                    xfrm_addr_cmp(&x->id.daddr, daddr, family) ||
 727                    xfrm_addr_cmp(&x->props.saddr, saddr, family))
 728                        continue;
 729
 730                if ((mark & x->mark.m) != x->mark.v)
 731                        continue;
 732                xfrm_state_hold(x);
 733                return x;
 734        }
 735
 736        return NULL;
 737}
 738
 739static inline struct xfrm_state *
 740__xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
 741{
 742        struct net *net = xs_net(x);
 743        u32 mark = x->mark.v & x->mark.m;
 744
 745        if (use_spi)
 746                return __xfrm_state_lookup(net, mark, &x->id.daddr,
 747                                           x->id.spi, x->id.proto, family);
 748        else
 749                return __xfrm_state_lookup_byaddr(net, mark,
 750                                                  &x->id.daddr,
 751                                                  &x->props.saddr,
 752                                                  x->id.proto, family);
 753}
 754
 755static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
 756{
 757        if (have_hash_collision &&
 758            (net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
 759            net->xfrm.state_num > net->xfrm.state_hmask)
 760                schedule_work(&net->xfrm.state_hash_work);
 761}
 762
 763static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
 764                               const struct flowi *fl, unsigned short family,
 765                               struct xfrm_state **best, int *acq_in_progress,
 766                               int *error)
 767{
 768        /* Resolution logic:
 769         * 1. There is a valid state with matching selector. Done.
 770         * 2. Valid state with inappropriate selector. Skip.
 771         *
 772         * Entering area of "sysdeps".
 773         *
 774         * 3. If state is not valid, selector is temporary, it selects
 775         *    only session which triggered previous resolution. Key
 776         *    manager will do something to install a state with proper
 777         *    selector.
 778         */
 779        if (x->km.state == XFRM_STATE_VALID) {
 780                if ((x->sel.family &&
 781                     !xfrm_selector_match(&x->sel, fl, x->sel.family)) ||
 782                    !security_xfrm_state_pol_flow_match(x, pol, fl))
 783                        return;
 784
 785                if (!*best ||
 786                    (*best)->km.dying > x->km.dying ||
 787                    ((*best)->km.dying == x->km.dying &&
 788                     (*best)->curlft.add_time < x->curlft.add_time))
 789                        *best = x;
 790        } else if (x->km.state == XFRM_STATE_ACQ) {
 791                *acq_in_progress = 1;
 792        } else if (x->km.state == XFRM_STATE_ERROR ||
 793                   x->km.state == XFRM_STATE_EXPIRED) {
 794                if (xfrm_selector_match(&x->sel, fl, x->sel.family) &&
 795                    security_xfrm_state_pol_flow_match(x, pol, fl))
 796                        *error = -ESRCH;
 797        }
 798}
 799
 800struct xfrm_state *
 801xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
 802                const struct flowi *fl, struct xfrm_tmpl *tmpl,
 803                struct xfrm_policy *pol, int *err,
 804                unsigned short family)
 805{
 806        static xfrm_address_t saddr_wildcard = { };
 807        struct net *net = xp_net(pol);
 808        unsigned int h, h_wildcard;
 809        struct hlist_node *entry;
 810        struct xfrm_state *x, *x0, *to_put;
 811        int acquire_in_progress = 0;
 812        int error = 0;
 813        struct xfrm_state *best = NULL;
 814        u32 mark = pol->mark.v & pol->mark.m;
 815        unsigned short encap_family = tmpl->encap_family;
 816
 817        to_put = NULL;
 818
 819        spin_lock_bh(&xfrm_state_lock);
 820        h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family);
 821        hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
 822                if (x->props.family == encap_family &&
 823                    x->props.reqid == tmpl->reqid &&
 824                    (mark & x->mark.m) == x->mark.v &&
 825                    !(x->props.flags & XFRM_STATE_WILDRECV) &&
 826                    xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
 827                    tmpl->mode == x->props.mode &&
 828                    tmpl->id.proto == x->id.proto &&
 829                    (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
 830                        xfrm_state_look_at(pol, x, fl, encap_family,
 831                                           &best, &acquire_in_progress, &error);
 832        }
 833        if (best)
 834                goto found;
 835
 836        h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family);
 837        hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h_wildcard, bydst) {
 838                if (x->props.family == encap_family &&
 839                    x->props.reqid == tmpl->reqid &&
 840                    (mark & x->mark.m) == x->mark.v &&
 841                    !(x->props.flags & XFRM_STATE_WILDRECV) &&
 842                    xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
 843                    tmpl->mode == x->props.mode &&
 844                    tmpl->id.proto == x->id.proto &&
 845                    (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
 846                        xfrm_state_look_at(pol, x, fl, encap_family,
 847                                           &best, &acquire_in_progress, &error);
 848        }
 849
 850found:
 851        x = best;
 852        if (!x && !error && !acquire_in_progress) {
 853                if (tmpl->id.spi &&
 854                    (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi,
 855                                              tmpl->id.proto, encap_family)) != NULL) {
 856                        to_put = x0;
 857                        error = -EEXIST;
 858                        goto out;
 859                }
 860                x = xfrm_state_alloc(net);
 861                if (x == NULL) {
 862                        error = -ENOMEM;
 863                        goto out;
 864                }
 865                /* Initialize temporary state matching only
 866                 * to current session. */
 867                xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family);
 868                memcpy(&x->mark, &pol->mark, sizeof(x->mark));
 869
 870                error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid);
 871                if (error) {
 872                        x->km.state = XFRM_STATE_DEAD;
 873                        to_put = x;
 874                        x = NULL;
 875                        goto out;
 876                }
 877
 878                if (km_query(x, tmpl, pol) == 0) {
 879                        x->km.state = XFRM_STATE_ACQ;
 880                        list_add(&x->km.all, &net->xfrm.state_all);
 881                        hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
 882                        h = xfrm_src_hash(net, daddr, saddr, encap_family);
 883                        hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
 884                        if (x->id.spi) {
 885                                h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family);
 886                                hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
 887                        }
 888                        x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
 889                        tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
 890                        net->xfrm.state_num++;
 891                        xfrm_hash_grow_check(net, x->bydst.next != NULL);
 892                } else {
 893                        x->km.state = XFRM_STATE_DEAD;
 894                        to_put = x;
 895                        x = NULL;
 896                        error = -ESRCH;
 897                }
 898        }
 899out:
 900        if (x)
 901                xfrm_state_hold(x);
 902        else
 903                *err = acquire_in_progress ? -EAGAIN : error;
 904        spin_unlock_bh(&xfrm_state_lock);
 905        if (to_put)
 906                xfrm_state_put(to_put);
 907        return x;
 908}
 909
 910struct xfrm_state *
 911xfrm_stateonly_find(struct net *net, u32 mark,
 912                    xfrm_address_t *daddr, xfrm_address_t *saddr,
 913                    unsigned short family, u8 mode, u8 proto, u32 reqid)
 914{
 915        unsigned int h;
 916        struct xfrm_state *rx = NULL, *x = NULL;
 917        struct hlist_node *entry;
 918
 919        spin_lock(&xfrm_state_lock);
 920        h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
 921        hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
 922                if (x->props.family == family &&
 923                    x->props.reqid == reqid &&
 924                    (mark & x->mark.m) == x->mark.v &&
 925                    !(x->props.flags & XFRM_STATE_WILDRECV) &&
 926                    xfrm_state_addr_check(x, daddr, saddr, family) &&
 927                    mode == x->props.mode &&
 928                    proto == x->id.proto &&
 929                    x->km.state == XFRM_STATE_VALID) {
 930                        rx = x;
 931                        break;
 932                }
 933        }
 934
 935        if (rx)
 936                xfrm_state_hold(rx);
 937        spin_unlock(&xfrm_state_lock);
 938
 939
 940        return rx;
 941}
 942EXPORT_SYMBOL(xfrm_stateonly_find);
 943
 944static void __xfrm_state_insert(struct xfrm_state *x)
 945{
 946        struct net *net = xs_net(x);
 947        unsigned int h;
 948
 949        list_add(&x->km.all, &net->xfrm.state_all);
 950
 951        h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
 952                          x->props.reqid, x->props.family);
 953        hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
 954
 955        h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
 956        hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
 957
 958        if (x->id.spi) {
 959                h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
 960                                  x->props.family);
 961
 962                hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
 963        }
 964
 965        tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
 966        if (x->replay_maxage)
 967                mod_timer(&x->rtimer, jiffies + x->replay_maxage);
 968
 969        wake_up(&net->xfrm.km_waitq);
 970
 971        net->xfrm.state_num++;
 972
 973        xfrm_hash_grow_check(net, x->bydst.next != NULL);
 974}
 975
 976/* xfrm_state_lock is held */
 977static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
 978{
 979        struct net *net = xs_net(xnew);
 980        unsigned short family = xnew->props.family;
 981        u32 reqid = xnew->props.reqid;
 982        struct xfrm_state *x;
 983        struct hlist_node *entry;
 984        unsigned int h;
 985        u32 mark = xnew->mark.v & xnew->mark.m;
 986
 987        h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
 988        hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
 989                if (x->props.family     == family &&
 990                    x->props.reqid      == reqid &&
 991                    (mark & x->mark.m) == x->mark.v &&
 992                    !xfrm_addr_cmp(&x->id.daddr, &xnew->id.daddr, family) &&
 993                    !xfrm_addr_cmp(&x->props.saddr, &xnew->props.saddr, family))
 994                        x->genid++;
 995        }
 996}
 997
 998void xfrm_state_insert(struct xfrm_state *x)
 999{
1000        spin_lock_bh(&xfrm_state_lock);
1001        __xfrm_state_bump_genids(x);
1002        __xfrm_state_insert(x);
1003        spin_unlock_bh(&xfrm_state_lock);
1004}
1005EXPORT_SYMBOL(xfrm_state_insert);
1006
1007/* xfrm_state_lock is held */
1008static struct xfrm_state *__find_acq_core(struct net *net, struct xfrm_mark *m,
1009                                          unsigned short family, u8 mode,
1010                                          u32 reqid, u8 proto,
1011                                          const xfrm_address_t *daddr,
1012                                          const xfrm_address_t *saddr, int create)
1013{
1014        unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1015        struct hlist_node *entry;
1016        struct xfrm_state *x;
1017        u32 mark = m->v & m->m;
1018
1019        hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
1020                if (x->props.reqid  != reqid ||
1021                    x->props.mode   != mode ||
1022                    x->props.family != family ||
1023                    x->km.state     != XFRM_STATE_ACQ ||
1024                    x->id.spi       != 0 ||
1025                    x->id.proto     != proto ||
1026                    (mark & x->mark.m) != x->mark.v ||
1027                    xfrm_addr_cmp(&x->id.daddr, daddr, family) ||
1028                    xfrm_addr_cmp(&x->props.saddr, saddr, family))
1029                        continue;
1030
1031                xfrm_state_hold(x);
1032                return x;
1033        }
1034
1035        if (!create)
1036                return NULL;
1037
1038        x = xfrm_state_alloc(net);
1039        if (likely(x)) {
1040                switch (family) {
1041                case AF_INET:
1042                        x->sel.daddr.a4 = daddr->a4;
1043                        x->sel.saddr.a4 = saddr->a4;
1044                        x->sel.prefixlen_d = 32;
1045                        x->sel.prefixlen_s = 32;
1046                        x->props.saddr.a4 = saddr->a4;
1047                        x->id.daddr.a4 = daddr->a4;
1048                        break;
1049
1050                case AF_INET6:
1051                        *(struct in6_addr *)x->sel.daddr.a6 = *(struct in6_addr *)daddr;
1052                        *(struct in6_addr *)x->sel.saddr.a6 = *(struct in6_addr *)saddr;
1053                        x->sel.prefixlen_d = 128;
1054                        x->sel.prefixlen_s = 128;
1055                        *(struct in6_addr *)x->props.saddr.a6 = *(struct in6_addr *)saddr;
1056                        *(struct in6_addr *)x->id.daddr.a6 = *(struct in6_addr *)daddr;
1057                        break;
1058                }
1059
1060                x->km.state = XFRM_STATE_ACQ;
1061                x->id.proto = proto;
1062                x->props.family = family;
1063                x->props.mode = mode;
1064                x->props.reqid = reqid;
1065                x->mark.v = m->v;
1066                x->mark.m = m->m;
1067                x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1068                xfrm_state_hold(x);
1069                tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
1070                list_add(&x->km.all, &net->xfrm.state_all);
1071                hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
1072                h = xfrm_src_hash(net, daddr, saddr, family);
1073                hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
1074
1075                net->xfrm.state_num++;
1076
1077                xfrm_hash_grow_check(net, x->bydst.next != NULL);
1078        }
1079
1080        return x;
1081}
1082
1083static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1084
1085int xfrm_state_add(struct xfrm_state *x)
1086{
1087        struct net *net = xs_net(x);
1088        struct xfrm_state *x1, *to_put;
1089        int family;
1090        int err;
1091        u32 mark = x->mark.v & x->mark.m;
1092        int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1093
1094        family = x->props.family;
1095
1096        to_put = NULL;
1097
1098        spin_lock_bh(&xfrm_state_lock);
1099
1100        x1 = __xfrm_state_locate(x, use_spi, family);
1101        if (x1) {
1102                to_put = x1;
1103                x1 = NULL;
1104                err = -EEXIST;
1105                goto out;
1106        }
1107
1108        if (use_spi && x->km.seq) {
1109                x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq);
1110                if (x1 && ((x1->id.proto != x->id.proto) ||
1111                    xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family))) {
1112                        to_put = x1;
1113                        x1 = NULL;
1114                }
1115        }
1116
1117        if (use_spi && !x1)
1118                x1 = __find_acq_core(net, &x->mark, family, x->props.mode,
1119                                     x->props.reqid, x->id.proto,
1120                                     &x->id.daddr, &x->props.saddr, 0);
1121
1122        __xfrm_state_bump_genids(x);
1123        __xfrm_state_insert(x);
1124        err = 0;
1125
1126out:
1127        spin_unlock_bh(&xfrm_state_lock);
1128
1129        if (x1) {
1130                xfrm_state_delete(x1);
1131                xfrm_state_put(x1);
1132        }
1133
1134        if (to_put)
1135                xfrm_state_put(to_put);
1136
1137        return err;
1138}
1139EXPORT_SYMBOL(xfrm_state_add);
1140
1141#ifdef CONFIG_XFRM_MIGRATE
1142static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, int *errp)
1143{
1144        struct net *net = xs_net(orig);
1145        int err = -ENOMEM;
1146        struct xfrm_state *x = xfrm_state_alloc(net);
1147        if (!x)
1148                goto out;
1149
1150        memcpy(&x->id, &orig->id, sizeof(x->id));
1151        memcpy(&x->sel, &orig->sel, sizeof(x->sel));
1152        memcpy(&x->lft, &orig->lft, sizeof(x->lft));
1153        x->props.mode = orig->props.mode;
1154        x->props.replay_window = orig->props.replay_window;
1155        x->props.reqid = orig->props.reqid;
1156        x->props.family = orig->props.family;
1157        x->props.saddr = orig->props.saddr;
1158
1159        if (orig->aalg) {
1160                x->aalg = xfrm_algo_auth_clone(orig->aalg);
1161                if (!x->aalg)
1162                        goto error;
1163        }
1164        x->props.aalgo = orig->props.aalgo;
1165
1166        if (orig->ealg) {
1167                x->ealg = xfrm_algo_clone(orig->ealg);
1168                if (!x->ealg)
1169                        goto error;
1170        }
1171        x->props.ealgo = orig->props.ealgo;
1172
1173        if (orig->calg) {
1174                x->calg = xfrm_algo_clone(orig->calg);
1175                if (!x->calg)
1176                        goto error;
1177        }
1178        x->props.calgo = orig->props.calgo;
1179
1180        if (orig->encap) {
1181                x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL);
1182                if (!x->encap)
1183                        goto error;
1184        }
1185
1186        if (orig->coaddr) {
1187                x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1188                                    GFP_KERNEL);
1189                if (!x->coaddr)
1190                        goto error;
1191        }
1192
1193        if (orig->replay_esn) {
1194                err = xfrm_replay_clone(x, orig);
1195                if (err)
1196                        goto error;
1197        }
1198
1199        memcpy(&x->mark, &orig->mark, sizeof(x->mark));
1200
1201        err = xfrm_init_state(x);
1202        if (err)
1203                goto error;
1204
1205        x->props.flags = orig->props.flags;
1206
1207        x->curlft.add_time = orig->curlft.add_time;
1208        x->km.state = orig->km.state;
1209        x->km.seq = orig->km.seq;
1210
1211        return x;
1212
1213 error:
1214        xfrm_state_put(x);
1215out:
1216        if (errp)
1217                *errp = err;
1218        return NULL;
1219}
1220
1221/* xfrm_state_lock is held */
1222struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m)
1223{
1224        unsigned int h;
1225        struct xfrm_state *x;
1226        struct hlist_node *entry;
1227
1228        if (m->reqid) {
1229                h = xfrm_dst_hash(&init_net, &m->old_daddr, &m->old_saddr,
1230                                  m->reqid, m->old_family);
1231                hlist_for_each_entry(x, entry, init_net.xfrm.state_bydst+h, bydst) {
1232                        if (x->props.mode != m->mode ||
1233                            x->id.proto != m->proto)
1234                                continue;
1235                        if (m->reqid && x->props.reqid != m->reqid)
1236                                continue;
1237                        if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr,
1238                                          m->old_family) ||
1239                            xfrm_addr_cmp(&x->props.saddr, &m->old_saddr,
1240                                          m->old_family))
1241                                continue;
1242                        xfrm_state_hold(x);
1243                        return x;
1244                }
1245        } else {
1246                h = xfrm_src_hash(&init_net, &m->old_daddr, &m->old_saddr,
1247                                  m->old_family);
1248                hlist_for_each_entry(x, entry, init_net.xfrm.state_bysrc+h, bysrc) {
1249                        if (x->props.mode != m->mode ||
1250                            x->id.proto != m->proto)
1251                                continue;
1252                        if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr,
1253                                          m->old_family) ||
1254                            xfrm_addr_cmp(&x->props.saddr, &m->old_saddr,
1255                                          m->old_family))
1256                                continue;
1257                        xfrm_state_hold(x);
1258                        return x;
1259                }
1260        }
1261
1262        return NULL;
1263}
1264EXPORT_SYMBOL(xfrm_migrate_state_find);
1265
1266struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1267                                       struct xfrm_migrate *m)
1268{
1269        struct xfrm_state *xc;
1270        int err;
1271
1272        xc = xfrm_state_clone(x, &err);
1273        if (!xc)
1274                return NULL;
1275
1276        memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1277        memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1278
1279        /* add state */
1280        if (!xfrm_addr_cmp(&x->id.daddr, &m->new_daddr, m->new_family)) {
1281                /* a care is needed when the destination address of the
1282                   state is to be updated as it is a part of triplet */
1283                xfrm_state_insert(xc);
1284        } else {
1285                if ((err = xfrm_state_add(xc)) < 0)
1286                        goto error;
1287        }
1288
1289        return xc;
1290error:
1291        xfrm_state_put(xc);
1292        return NULL;
1293}
1294EXPORT_SYMBOL(xfrm_state_migrate);
1295#endif
1296
1297int xfrm_state_update(struct xfrm_state *x)
1298{
1299        struct xfrm_state *x1, *to_put;
1300        int err;
1301        int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1302
1303        to_put = NULL;
1304
1305        spin_lock_bh(&xfrm_state_lock);
1306        x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1307
1308        err = -ESRCH;
1309        if (!x1)
1310                goto out;
1311
1312        if (xfrm_state_kern(x1)) {
1313                to_put = x1;
1314                err = -EEXIST;
1315                goto out;
1316        }
1317
1318        if (x1->km.state == XFRM_STATE_ACQ) {
1319                __xfrm_state_insert(x);
1320                x = NULL;
1321        }
1322        err = 0;
1323
1324out:
1325        spin_unlock_bh(&xfrm_state_lock);
1326
1327        if (to_put)
1328                xfrm_state_put(to_put);
1329
1330        if (err)
1331                return err;
1332
1333        if (!x) {
1334                xfrm_state_delete(x1);
1335                xfrm_state_put(x1);
1336                return 0;
1337        }
1338
1339        err = -EINVAL;
1340        spin_lock_bh(&x1->lock);
1341        if (likely(x1->km.state == XFRM_STATE_VALID)) {
1342                if (x->encap && x1->encap)
1343                        memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1344                if (x->coaddr && x1->coaddr) {
1345                        memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1346                }
1347                if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1348                        memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1349                memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1350                x1->km.dying = 0;
1351
1352                tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
1353                if (x1->curlft.use_time)
1354                        xfrm_state_check_expire(x1);
1355
1356                err = 0;
1357                x->km.state = XFRM_STATE_DEAD;
1358                __xfrm_state_put(x);
1359        }
1360        spin_unlock_bh(&x1->lock);
1361
1362        xfrm_state_put(x1);
1363
1364        return err;
1365}
1366EXPORT_SYMBOL(xfrm_state_update);
1367
1368int xfrm_state_check_expire(struct xfrm_state *x)
1369{
1370        if (!x->curlft.use_time)
1371                x->curlft.use_time = get_seconds();
1372
1373        if (x->km.state != XFRM_STATE_VALID)
1374                return -EINVAL;
1375
1376        if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1377            x->curlft.packets >= x->lft.hard_packet_limit) {
1378                x->km.state = XFRM_STATE_EXPIRED;
1379                tasklet_hrtimer_start(&x->mtimer, ktime_set(0,0), HRTIMER_MODE_REL);
1380                return -EINVAL;
1381        }
1382
1383        if (!x->km.dying &&
1384            (x->curlft.bytes >= x->lft.soft_byte_limit ||
1385             x->curlft.packets >= x->lft.soft_packet_limit)) {
1386                x->km.dying = 1;
1387                km_state_expired(x, 0, 0);
1388        }
1389        return 0;
1390}
1391EXPORT_SYMBOL(xfrm_state_check_expire);
1392
1393struct xfrm_state *
1394xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi,
1395                  u8 proto, unsigned short family)
1396{
1397        struct xfrm_state *x;
1398
1399        spin_lock_bh(&xfrm_state_lock);
1400        x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
1401        spin_unlock_bh(&xfrm_state_lock);
1402        return x;
1403}
1404EXPORT_SYMBOL(xfrm_state_lookup);
1405
1406struct xfrm_state *
1407xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1408                         const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1409                         u8 proto, unsigned short family)
1410{
1411        struct xfrm_state *x;
1412
1413        spin_lock_bh(&xfrm_state_lock);
1414        x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
1415        spin_unlock_bh(&xfrm_state_lock);
1416        return x;
1417}
1418EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1419
1420struct xfrm_state *
1421xfrm_find_acq(struct net *net, struct xfrm_mark *mark, u8 mode, u32 reqid, u8 proto,
1422              const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1423              int create, unsigned short family)
1424{
1425        struct xfrm_state *x;
1426
1427        spin_lock_bh(&xfrm_state_lock);
1428        x = __find_acq_core(net, mark, family, mode, reqid, proto, daddr, saddr, create);
1429        spin_unlock_bh(&xfrm_state_lock);
1430
1431        return x;
1432}
1433EXPORT_SYMBOL(xfrm_find_acq);
1434
1435#ifdef CONFIG_XFRM_SUB_POLICY
1436int
1437xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1438               unsigned short family)
1439{
1440        int err = 0;
1441        struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1442        if (!afinfo)
1443                return -EAFNOSUPPORT;
1444
1445        spin_lock_bh(&xfrm_state_lock);
1446        if (afinfo->tmpl_sort)
1447                err = afinfo->tmpl_sort(dst, src, n);
1448        spin_unlock_bh(&xfrm_state_lock);
1449        xfrm_state_put_afinfo(afinfo);
1450        return err;
1451}
1452EXPORT_SYMBOL(xfrm_tmpl_sort);
1453
1454int
1455xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1456                unsigned short family)
1457{
1458        int err = 0;
1459        struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1460        if (!afinfo)
1461                return -EAFNOSUPPORT;
1462
1463        spin_lock_bh(&xfrm_state_lock);
1464        if (afinfo->state_sort)
1465                err = afinfo->state_sort(dst, src, n);
1466        spin_unlock_bh(&xfrm_state_lock);
1467        xfrm_state_put_afinfo(afinfo);
1468        return err;
1469}
1470EXPORT_SYMBOL(xfrm_state_sort);
1471#endif
1472
1473/* Silly enough, but I'm lazy to build resolution list */
1474
1475static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1476{
1477        int i;
1478
1479        for (i = 0; i <= net->xfrm.state_hmask; i++) {
1480                struct hlist_node *entry;
1481                struct xfrm_state *x;
1482
1483                hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) {
1484                        if (x->km.seq == seq &&
1485                            (mark & x->mark.m) == x->mark.v &&
1486                            x->km.state == XFRM_STATE_ACQ) {
1487                                xfrm_state_hold(x);
1488                                return x;
1489                        }
1490                }
1491        }
1492        return NULL;
1493}
1494
1495struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1496{
1497        struct xfrm_state *x;
1498
1499        spin_lock_bh(&xfrm_state_lock);
1500        x = __xfrm_find_acq_byseq(net, mark, seq);
1501        spin_unlock_bh(&xfrm_state_lock);
1502        return x;
1503}
1504EXPORT_SYMBOL(xfrm_find_acq_byseq);
1505
1506u32 xfrm_get_acqseq(void)
1507{
1508        u32 res;
1509        static atomic_t acqseq;
1510
1511        do {
1512                res = atomic_inc_return(&acqseq);
1513        } while (!res);
1514
1515        return res;
1516}
1517EXPORT_SYMBOL(xfrm_get_acqseq);
1518
1519int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
1520{
1521        struct net *net = xs_net(x);
1522        unsigned int h;
1523        struct xfrm_state *x0;
1524        int err = -ENOENT;
1525        __be32 minspi = htonl(low);
1526        __be32 maxspi = htonl(high);
1527        u32 mark = x->mark.v & x->mark.m;
1528
1529        spin_lock_bh(&x->lock);
1530        if (x->km.state == XFRM_STATE_DEAD)
1531                goto unlock;
1532
1533        err = 0;
1534        if (x->id.spi)
1535                goto unlock;
1536
1537        err = -ENOENT;
1538
1539        if (minspi == maxspi) {
1540                x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
1541                if (x0) {
1542                        xfrm_state_put(x0);
1543                        goto unlock;
1544                }
1545                x->id.spi = minspi;
1546        } else {
1547                u32 spi = 0;
1548                for (h=0; h<high-low+1; h++) {
1549                        spi = low + net_random()%(high-low+1);
1550                        x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
1551                        if (x0 == NULL) {
1552                                x->id.spi = htonl(spi);
1553                                break;
1554                        }
1555                        xfrm_state_put(x0);
1556                }
1557        }
1558        if (x->id.spi) {
1559                spin_lock_bh(&xfrm_state_lock);
1560                h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
1561                hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
1562                spin_unlock_bh(&xfrm_state_lock);
1563
1564                err = 0;
1565        }
1566
1567unlock:
1568        spin_unlock_bh(&x->lock);
1569
1570        return err;
1571}
1572EXPORT_SYMBOL(xfrm_alloc_spi);
1573
1574int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1575                    int (*func)(struct xfrm_state *, int, void*),
1576                    void *data)
1577{
1578        struct xfrm_state *state;
1579        struct xfrm_state_walk *x;
1580        int err = 0;
1581
1582        if (walk->seq != 0 && list_empty(&walk->all))
1583                return 0;
1584
1585        spin_lock_bh(&xfrm_state_lock);
1586        if (list_empty(&walk->all))
1587                x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
1588        else
1589                x = list_entry(&walk->all, struct xfrm_state_walk, all);
1590        list_for_each_entry_from(x, &net->xfrm.state_all, all) {
1591                if (x->state == XFRM_STATE_DEAD)
1592                        continue;
1593                state = container_of(x, struct xfrm_state, km);
1594                if (!xfrm_id_proto_match(state->id.proto, walk->proto))
1595                        continue;
1596                err = func(state, walk->seq, data);
1597                if (err) {
1598                        list_move_tail(&walk->all, &x->all);
1599                        goto out;
1600                }
1601                walk->seq++;
1602        }
1603        if (walk->seq == 0) {
1604                err = -ENOENT;
1605                goto out;
1606        }
1607        list_del_init(&walk->all);
1608out:
1609        spin_unlock_bh(&xfrm_state_lock);
1610        return err;
1611}
1612EXPORT_SYMBOL(xfrm_state_walk);
1613
1614void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto)
1615{
1616        INIT_LIST_HEAD(&walk->all);
1617        walk->proto = proto;
1618        walk->state = XFRM_STATE_DEAD;
1619        walk->seq = 0;
1620}
1621EXPORT_SYMBOL(xfrm_state_walk_init);
1622
1623void xfrm_state_walk_done(struct xfrm_state_walk *walk)
1624{
1625        if (list_empty(&walk->all))
1626                return;
1627
1628        spin_lock_bh(&xfrm_state_lock);
1629        list_del(&walk->all);
1630        spin_unlock_bh(&xfrm_state_lock);
1631}
1632EXPORT_SYMBOL(xfrm_state_walk_done);
1633
1634static void xfrm_replay_timer_handler(unsigned long data)
1635{
1636        struct xfrm_state *x = (struct xfrm_state*)data;
1637
1638        spin_lock(&x->lock);
1639
1640        if (x->km.state == XFRM_STATE_VALID) {
1641                if (xfrm_aevent_is_on(xs_net(x)))
1642                        x->repl->notify(x, XFRM_REPLAY_TIMEOUT);
1643                else
1644                        x->xflags |= XFRM_TIME_DEFER;
1645        }
1646
1647        spin_unlock(&x->lock);
1648}
1649
1650static LIST_HEAD(xfrm_km_list);
1651static DEFINE_RWLOCK(xfrm_km_lock);
1652
1653void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
1654{
1655        struct xfrm_mgr *km;
1656
1657        read_lock(&xfrm_km_lock);
1658        list_for_each_entry(km, &xfrm_km_list, list)
1659                if (km->notify_policy)
1660                        km->notify_policy(xp, dir, c);
1661        read_unlock(&xfrm_km_lock);
1662}
1663
1664void km_state_notify(struct xfrm_state *x, const struct km_event *c)
1665{
1666        struct xfrm_mgr *km;
1667        read_lock(&xfrm_km_lock);
1668        list_for_each_entry(km, &xfrm_km_list, list)
1669                if (km->notify)
1670                        km->notify(x, c);
1671        read_unlock(&xfrm_km_lock);
1672}
1673
1674EXPORT_SYMBOL(km_policy_notify);
1675EXPORT_SYMBOL(km_state_notify);
1676
1677void km_state_expired(struct xfrm_state *x, int hard, u32 portid)
1678{
1679        struct net *net = xs_net(x);
1680        struct km_event c;
1681
1682        c.data.hard = hard;
1683        c.portid = portid;
1684        c.event = XFRM_MSG_EXPIRE;
1685        km_state_notify(x, &c);
1686
1687        if (hard)
1688                wake_up(&net->xfrm.km_waitq);
1689}
1690
1691EXPORT_SYMBOL(km_state_expired);
1692/*
1693 * We send to all registered managers regardless of failure
1694 * We are happy with one success
1695*/
1696int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
1697{
1698        int err = -EINVAL, acqret;
1699        struct xfrm_mgr *km;
1700
1701        read_lock(&xfrm_km_lock);
1702        list_for_each_entry(km, &xfrm_km_list, list) {
1703                acqret = km->acquire(x, t, pol);
1704                if (!acqret)
1705                        err = acqret;
1706        }
1707        read_unlock(&xfrm_km_lock);
1708        return err;
1709}
1710EXPORT_SYMBOL(km_query);
1711
1712int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
1713{
1714        int err = -EINVAL;
1715        struct xfrm_mgr *km;
1716
1717        read_lock(&xfrm_km_lock);
1718        list_for_each_entry(km, &xfrm_km_list, list) {
1719                if (km->new_mapping)
1720                        err = km->new_mapping(x, ipaddr, sport);
1721                if (!err)
1722                        break;
1723        }
1724        read_unlock(&xfrm_km_lock);
1725        return err;
1726}
1727EXPORT_SYMBOL(km_new_mapping);
1728
1729void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid)
1730{
1731        struct net *net = xp_net(pol);
1732        struct km_event c;
1733
1734        c.data.hard = hard;
1735        c.portid = portid;
1736        c.event = XFRM_MSG_POLEXPIRE;
1737        km_policy_notify(pol, dir, &c);
1738
1739        if (hard)
1740                wake_up(&net->xfrm.km_waitq);
1741}
1742EXPORT_SYMBOL(km_policy_expired);
1743
1744#ifdef CONFIG_XFRM_MIGRATE
1745int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1746               const struct xfrm_migrate *m, int num_migrate,
1747               const struct xfrm_kmaddress *k)
1748{
1749        int err = -EINVAL;
1750        int ret;
1751        struct xfrm_mgr *km;
1752
1753        read_lock(&xfrm_km_lock);
1754        list_for_each_entry(km, &xfrm_km_list, list) {
1755                if (km->migrate) {
1756                        ret = km->migrate(sel, dir, type, m, num_migrate, k);
1757                        if (!ret)
1758                                err = ret;
1759                }
1760        }
1761        read_unlock(&xfrm_km_lock);
1762        return err;
1763}
1764EXPORT_SYMBOL(km_migrate);
1765#endif
1766
1767int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
1768{
1769        int err = -EINVAL;
1770        int ret;
1771        struct xfrm_mgr *km;
1772
1773        read_lock(&xfrm_km_lock);
1774        list_for_each_entry(km, &xfrm_km_list, list) {
1775                if (km->report) {
1776                        ret = km->report(net, proto, sel, addr);
1777                        if (!ret)
1778                                err = ret;
1779                }
1780        }
1781        read_unlock(&xfrm_km_lock);
1782        return err;
1783}
1784EXPORT_SYMBOL(km_report);
1785
1786int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1787{
1788        int err;
1789        u8 *data;
1790        struct xfrm_mgr *km;
1791        struct xfrm_policy *pol = NULL;
1792
1793        if (optlen <= 0 || optlen > PAGE_SIZE)
1794                return -EMSGSIZE;
1795
1796        data = kmalloc(optlen, GFP_KERNEL);
1797        if (!data)
1798                return -ENOMEM;
1799
1800        err = -EFAULT;
1801        if (copy_from_user(data, optval, optlen))
1802                goto out;
1803
1804        err = -EINVAL;
1805        read_lock(&xfrm_km_lock);
1806        list_for_each_entry(km, &xfrm_km_list, list) {
1807                pol = km->compile_policy(sk, optname, data,
1808                                         optlen, &err);
1809                if (err >= 0)
1810                        break;
1811        }
1812        read_unlock(&xfrm_km_lock);
1813
1814        if (err >= 0) {
1815                xfrm_sk_policy_insert(sk, err, pol);
1816                xfrm_pol_put(pol);
1817                err = 0;
1818        }
1819
1820out:
1821        kfree(data);
1822        return err;
1823}
1824EXPORT_SYMBOL(xfrm_user_policy);
1825
1826int xfrm_register_km(struct xfrm_mgr *km)
1827{
1828        write_lock_bh(&xfrm_km_lock);
1829        list_add_tail(&km->list, &xfrm_km_list);
1830        write_unlock_bh(&xfrm_km_lock);
1831        return 0;
1832}
1833EXPORT_SYMBOL(xfrm_register_km);
1834
1835int xfrm_unregister_km(struct xfrm_mgr *km)
1836{
1837        write_lock_bh(&xfrm_km_lock);
1838        list_del(&km->list);
1839        write_unlock_bh(&xfrm_km_lock);
1840        return 0;
1841}
1842EXPORT_SYMBOL(xfrm_unregister_km);
1843
1844int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
1845{
1846        int err = 0;
1847        if (unlikely(afinfo == NULL))
1848                return -EINVAL;
1849        if (unlikely(afinfo->family >= NPROTO))
1850                return -EAFNOSUPPORT;
1851        write_lock_bh(&xfrm_state_afinfo_lock);
1852        if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
1853                err = -ENOBUFS;
1854        else
1855                xfrm_state_afinfo[afinfo->family] = afinfo;
1856        write_unlock_bh(&xfrm_state_afinfo_lock);
1857        return err;
1858}
1859EXPORT_SYMBOL(xfrm_state_register_afinfo);
1860
1861int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
1862{
1863        int err = 0;
1864        if (unlikely(afinfo == NULL))
1865                return -EINVAL;
1866        if (unlikely(afinfo->family >= NPROTO))
1867                return -EAFNOSUPPORT;
1868        write_lock_bh(&xfrm_state_afinfo_lock);
1869        if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
1870                if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo))
1871                        err = -EINVAL;
1872                else
1873                        xfrm_state_afinfo[afinfo->family] = NULL;
1874        }
1875        write_unlock_bh(&xfrm_state_afinfo_lock);
1876        return err;
1877}
1878EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
1879
1880static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
1881{
1882        struct xfrm_state_afinfo *afinfo;
1883        if (unlikely(family >= NPROTO))
1884                return NULL;
1885        read_lock(&xfrm_state_afinfo_lock);
1886        afinfo = xfrm_state_afinfo[family];
1887        if (unlikely(!afinfo))
1888                read_unlock(&xfrm_state_afinfo_lock);
1889        return afinfo;
1890}
1891
1892static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo)
1893        __releases(xfrm_state_afinfo_lock)
1894{
1895        read_unlock(&xfrm_state_afinfo_lock);
1896}
1897
1898/* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
1899void xfrm_state_delete_tunnel(struct xfrm_state *x)
1900{
1901        if (x->tunnel) {
1902                struct xfrm_state *t = x->tunnel;
1903
1904                if (atomic_read(&t->tunnel_users) == 2)
1905                        xfrm_state_delete(t);
1906                atomic_dec(&t->tunnel_users);
1907                xfrm_state_put(t);
1908                x->tunnel = NULL;
1909        }
1910}
1911EXPORT_SYMBOL(xfrm_state_delete_tunnel);
1912
1913int xfrm_state_mtu(struct xfrm_state *x, int mtu)
1914{
1915        int res;
1916
1917        spin_lock_bh(&x->lock);
1918        if (x->km.state == XFRM_STATE_VALID &&
1919            x->type && x->type->get_mtu)
1920                res = x->type->get_mtu(x, mtu);
1921        else
1922                res = mtu - x->props.header_len;
1923        spin_unlock_bh(&x->lock);
1924        return res;
1925}
1926
1927int __xfrm_init_state(struct xfrm_state *x, bool init_replay)
1928{
1929        struct xfrm_state_afinfo *afinfo;
1930        struct xfrm_mode *inner_mode;
1931        int family = x->props.family;
1932        int err;
1933
1934        err = -EAFNOSUPPORT;
1935        afinfo = xfrm_state_get_afinfo(family);
1936        if (!afinfo)
1937                goto error;
1938
1939        err = 0;
1940        if (afinfo->init_flags)
1941                err = afinfo->init_flags(x);
1942
1943        xfrm_state_put_afinfo(afinfo);
1944
1945        if (err)
1946                goto error;
1947
1948        err = -EPROTONOSUPPORT;
1949
1950        if (x->sel.family != AF_UNSPEC) {
1951                inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
1952                if (inner_mode == NULL)
1953                        goto error;
1954
1955                if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
1956                    family != x->sel.family) {
1957                        xfrm_put_mode(inner_mode);
1958                        goto error;
1959                }
1960
1961                x->inner_mode = inner_mode;
1962        } else {
1963                struct xfrm_mode *inner_mode_iaf;
1964                int iafamily = AF_INET;
1965
1966                inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
1967                if (inner_mode == NULL)
1968                        goto error;
1969
1970                if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) {
1971                        xfrm_put_mode(inner_mode);
1972                        goto error;
1973                }
1974                x->inner_mode = inner_mode;
1975
1976                if (x->props.family == AF_INET)
1977                        iafamily = AF_INET6;
1978
1979                inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
1980                if (inner_mode_iaf) {
1981                        if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
1982                                x->inner_mode_iaf = inner_mode_iaf;
1983                        else
1984                                xfrm_put_mode(inner_mode_iaf);
1985                }
1986        }
1987
1988        x->type = xfrm_get_type(x->id.proto, family);
1989        if (x->type == NULL)
1990                goto error;
1991
1992        err = x->type->init_state(x);
1993        if (err)
1994                goto error;
1995
1996        x->outer_mode = xfrm_get_mode(x->props.mode, family);
1997        if (x->outer_mode == NULL) {
1998                err = -EPROTONOSUPPORT;
1999                goto error;
2000        }
2001
2002        if (init_replay) {
2003                err = xfrm_init_replay(x);
2004                if (err)
2005                        goto error;
2006        }
2007
2008        x->km.state = XFRM_STATE_VALID;
2009
2010error:
2011        return err;
2012}
2013
2014EXPORT_SYMBOL(__xfrm_init_state);
2015
2016int xfrm_init_state(struct xfrm_state *x)
2017{
2018        return __xfrm_init_state(x, true);
2019}
2020
2021EXPORT_SYMBOL(xfrm_init_state);
2022
2023int __net_init xfrm_state_init(struct net *net)
2024{
2025        unsigned int sz;
2026
2027        INIT_LIST_HEAD(&net->xfrm.state_all);
2028
2029        sz = sizeof(struct hlist_head) * 8;
2030
2031        net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2032        if (!net->xfrm.state_bydst)
2033                goto out_bydst;
2034        net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2035        if (!net->xfrm.state_bysrc)
2036                goto out_bysrc;
2037        net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2038        if (!net->xfrm.state_byspi)
2039                goto out_byspi;
2040        net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2041
2042        net->xfrm.state_num = 0;
2043        INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2044        INIT_HLIST_HEAD(&net->xfrm.state_gc_list);
2045        INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task);
2046        init_waitqueue_head(&net->xfrm.km_waitq);
2047        return 0;
2048
2049out_byspi:
2050        xfrm_hash_free(net->xfrm.state_bysrc, sz);
2051out_bysrc:
2052        xfrm_hash_free(net->xfrm.state_bydst, sz);
2053out_bydst:
2054        return -ENOMEM;
2055}
2056
2057void xfrm_state_fini(struct net *net)
2058{
2059        struct xfrm_audit audit_info;
2060        unsigned int sz;
2061
2062        flush_work(&net->xfrm.state_hash_work);
2063        audit_info.loginuid = INVALID_UID;
2064        audit_info.sessionid = -1;
2065        audit_info.secid = 0;
2066        xfrm_state_flush(net, IPSEC_PROTO_ANY, &audit_info);
2067        flush_work(&net->xfrm.state_gc_work);
2068
2069        WARN_ON(!list_empty(&net->xfrm.state_all));
2070
2071        sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2072        WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2073        xfrm_hash_free(net->xfrm.state_byspi, sz);
2074        WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2075        xfrm_hash_free(net->xfrm.state_bysrc, sz);
2076        WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2077        xfrm_hash_free(net->xfrm.state_bydst, sz);
2078}
2079
2080#ifdef CONFIG_AUDITSYSCALL
2081static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2082                                     struct audit_buffer *audit_buf)
2083{
2084        struct xfrm_sec_ctx *ctx = x->security;
2085        u32 spi = ntohl(x->id.spi);
2086
2087        if (ctx)
2088                audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2089                                 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2090
2091        switch(x->props.family) {
2092        case AF_INET:
2093                audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2094                                 &x->props.saddr.a4, &x->id.daddr.a4);
2095                break;
2096        case AF_INET6:
2097                audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2098                                 x->props.saddr.a6, x->id.daddr.a6);
2099                break;
2100        }
2101
2102        audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2103}
2104
2105static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2106                                      struct audit_buffer *audit_buf)
2107{
2108        const struct iphdr *iph4;
2109        const struct ipv6hdr *iph6;
2110
2111        switch (family) {
2112        case AF_INET:
2113                iph4 = ip_hdr(skb);
2114                audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2115                                 &iph4->saddr, &iph4->daddr);
2116                break;
2117        case AF_INET6:
2118                iph6 = ipv6_hdr(skb);
2119                audit_log_format(audit_buf,
2120                                 " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2121                                 &iph6->saddr,&iph6->daddr,
2122                                 iph6->flow_lbl[0] & 0x0f,
2123                                 iph6->flow_lbl[1],
2124                                 iph6->flow_lbl[2]);
2125                break;
2126        }
2127}
2128
2129void xfrm_audit_state_add(struct xfrm_state *x, int result,
2130                          kuid_t auid, u32 sessionid, u32 secid)
2131{
2132        struct audit_buffer *audit_buf;
2133
2134        audit_buf = xfrm_audit_start("SAD-add");
2135        if (audit_buf == NULL)
2136                return;
2137        xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2138        xfrm_audit_helper_sainfo(x, audit_buf);
2139        audit_log_format(audit_buf, " res=%u", result);
2140        audit_log_end(audit_buf);
2141}
2142EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2143
2144void xfrm_audit_state_delete(struct xfrm_state *x, int result,
2145                             kuid_t auid, u32 sessionid, u32 secid)
2146{
2147        struct audit_buffer *audit_buf;
2148
2149        audit_buf = xfrm_audit_start("SAD-delete");
2150        if (audit_buf == NULL)
2151                return;
2152        xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2153        xfrm_audit_helper_sainfo(x, audit_buf);
2154        audit_log_format(audit_buf, " res=%u", result);
2155        audit_log_end(audit_buf);
2156}
2157EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
2158
2159void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
2160                                      struct sk_buff *skb)
2161{
2162        struct audit_buffer *audit_buf;
2163        u32 spi;
2164
2165        audit_buf = xfrm_audit_start("SA-replay-overflow");
2166        if (audit_buf == NULL)
2167                return;
2168        xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2169        /* don't record the sequence number because it's inherent in this kind
2170         * of audit message */
2171        spi = ntohl(x->id.spi);
2172        audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2173        audit_log_end(audit_buf);
2174}
2175EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
2176
2177void xfrm_audit_state_replay(struct xfrm_state *x,
2178                             struct sk_buff *skb, __be32 net_seq)
2179{
2180        struct audit_buffer *audit_buf;
2181        u32 spi;
2182
2183        audit_buf = xfrm_audit_start("SA-replayed-pkt");
2184        if (audit_buf == NULL)
2185                return;
2186        xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2187        spi = ntohl(x->id.spi);
2188        audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2189                         spi, spi, ntohl(net_seq));
2190        audit_log_end(audit_buf);
2191}
2192EXPORT_SYMBOL_GPL(xfrm_audit_state_replay);
2193
2194void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
2195{
2196        struct audit_buffer *audit_buf;
2197
2198        audit_buf = xfrm_audit_start("SA-notfound");
2199        if (audit_buf == NULL)
2200                return;
2201        xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2202        audit_log_end(audit_buf);
2203}
2204EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
2205
2206void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
2207                               __be32 net_spi, __be32 net_seq)
2208{
2209        struct audit_buffer *audit_buf;
2210        u32 spi;
2211
2212        audit_buf = xfrm_audit_start("SA-notfound");
2213        if (audit_buf == NULL)
2214                return;
2215        xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2216        spi = ntohl(net_spi);
2217        audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2218                         spi, spi, ntohl(net_seq));
2219        audit_log_end(audit_buf);
2220}
2221EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
2222
2223void xfrm_audit_state_icvfail(struct xfrm_state *x,
2224                              struct sk_buff *skb, u8 proto)
2225{
2226        struct audit_buffer *audit_buf;
2227        __be32 net_spi;
2228        __be32 net_seq;
2229
2230        audit_buf = xfrm_audit_start("SA-icv-failure");
2231        if (audit_buf == NULL)
2232                return;
2233        xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2234        if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
2235                u32 spi = ntohl(net_spi);
2236                audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2237                                 spi, spi, ntohl(net_seq));
2238        }
2239        audit_log_end(audit_buf);
2240}
2241EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
2242#endif /* CONFIG_AUDITSYSCALL */
2243
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