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 unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024;
  39
  40static inline unsigned int xfrm_dst_hash(struct net *net,
  41                                         const xfrm_address_t *daddr,
  42                                         const xfrm_address_t *saddr,
  43                                         u32 reqid,
  44                                         unsigned short family)
  45{
  46        return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask);
  47}
  48
  49static inline unsigned int xfrm_src_hash(struct net *net,
  50                                         const xfrm_address_t *daddr,
  51                                         const xfrm_address_t *saddr,
  52                                         unsigned short family)
  53{
  54        return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask);
  55}
  56
  57static inline unsigned int
  58xfrm_spi_hash(struct net *net, const xfrm_address_t *daddr,
  59              __be32 spi, u8 proto, unsigned short family)
  60{
  61        return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask);
  62}
  63
  64static void xfrm_hash_transfer(struct hlist_head *list,
  65                               struct hlist_head *ndsttable,
  66                               struct hlist_head *nsrctable,
  67                               struct hlist_head *nspitable,
  68                               unsigned int nhashmask)
  69{
  70        struct hlist_node *tmp;
  71        struct xfrm_state *x;
  72
  73        hlist_for_each_entry_safe(x, tmp, list, bydst) {
  74                unsigned int h;
  75
  76                h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr,
  77                                    x->props.reqid, x->props.family,
  78                                    nhashmask);
  79                hlist_add_head(&x->bydst, ndsttable+h);
  80
  81                h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr,
  82                                    x->props.family,
  83                                    nhashmask);
  84                hlist_add_head(&x->bysrc, nsrctable+h);
  85
  86                if (x->id.spi) {
  87                        h = __xfrm_spi_hash(&x->id.daddr, x->id.spi,
  88                                            x->id.proto, x->props.family,
  89                                            nhashmask);
  90                        hlist_add_head(&x->byspi, nspitable+h);
  91                }
  92        }
  93}
  94
  95static unsigned long xfrm_hash_new_size(unsigned int state_hmask)
  96{
  97        return ((state_hmask + 1) << 1) * sizeof(struct hlist_head);
  98}
  99
 100static void xfrm_hash_resize(struct work_struct *work)
 101{
 102        struct net *net = container_of(work, struct net, xfrm.state_hash_work);
 103        struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi;
 104        unsigned long nsize, osize;
 105        unsigned int nhashmask, ohashmask;
 106        int i;
 107
 108        nsize = xfrm_hash_new_size(net->xfrm.state_hmask);
 109        ndst = xfrm_hash_alloc(nsize);
 110        if (!ndst)
 111                return;
 112        nsrc = xfrm_hash_alloc(nsize);
 113        if (!nsrc) {
 114                xfrm_hash_free(ndst, nsize);
 115                return;
 116        }
 117        nspi = xfrm_hash_alloc(nsize);
 118        if (!nspi) {
 119                xfrm_hash_free(ndst, nsize);
 120                xfrm_hash_free(nsrc, nsize);
 121                return;
 122        }
 123
 124        spin_lock_bh(&net->xfrm.xfrm_state_lock);
 125
 126        nhashmask = (nsize / sizeof(struct hlist_head)) - 1U;
 127        for (i = net->xfrm.state_hmask; i >= 0; i--)
 128                xfrm_hash_transfer(net->xfrm.state_bydst+i, ndst, nsrc, nspi,
 129                                   nhashmask);
 130
 131        odst = net->xfrm.state_bydst;
 132        osrc = net->xfrm.state_bysrc;
 133        ospi = net->xfrm.state_byspi;
 134        ohashmask = net->xfrm.state_hmask;
 135
 136        net->xfrm.state_bydst = ndst;
 137        net->xfrm.state_bysrc = nsrc;
 138        net->xfrm.state_byspi = nspi;
 139        net->xfrm.state_hmask = nhashmask;
 140
 141        spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 142
 143        osize = (ohashmask + 1) * sizeof(struct hlist_head);
 144        xfrm_hash_free(odst, osize);
 145        xfrm_hash_free(osrc, osize);
 146        xfrm_hash_free(ospi, osize);
 147}
 148
 149static DEFINE_SPINLOCK(xfrm_state_afinfo_lock);
 150static struct xfrm_state_afinfo __rcu *xfrm_state_afinfo[NPROTO];
 151
 152static DEFINE_SPINLOCK(xfrm_state_gc_lock);
 153
 154int __xfrm_state_delete(struct xfrm_state *x);
 155
 156int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
 157bool km_is_alive(const struct km_event *c);
 158void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
 159
 160static DEFINE_SPINLOCK(xfrm_type_lock);
 161int xfrm_register_type(const struct xfrm_type *type, unsigned short family)
 162{
 163        struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
 164        const struct xfrm_type **typemap;
 165        int err = 0;
 166
 167        if (unlikely(afinfo == NULL))
 168                return -EAFNOSUPPORT;
 169        typemap = afinfo->type_map;
 170        spin_lock_bh(&xfrm_type_lock);
 171
 172        if (likely(typemap[type->proto] == NULL))
 173                typemap[type->proto] = type;
 174        else
 175                err = -EEXIST;
 176        spin_unlock_bh(&xfrm_type_lock);
 177        xfrm_state_put_afinfo(afinfo);
 178        return err;
 179}
 180EXPORT_SYMBOL(xfrm_register_type);
 181
 182int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family)
 183{
 184        struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
 185        const struct xfrm_type **typemap;
 186        int err = 0;
 187
 188        if (unlikely(afinfo == NULL))
 189                return -EAFNOSUPPORT;
 190        typemap = afinfo->type_map;
 191        spin_lock_bh(&xfrm_type_lock);
 192
 193        if (unlikely(typemap[type->proto] != type))
 194                err = -ENOENT;
 195        else
 196                typemap[type->proto] = NULL;
 197        spin_unlock_bh(&xfrm_type_lock);
 198        xfrm_state_put_afinfo(afinfo);
 199        return err;
 200}
 201EXPORT_SYMBOL(xfrm_unregister_type);
 202
 203static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
 204{
 205        struct xfrm_state_afinfo *afinfo;
 206        const struct xfrm_type **typemap;
 207        const struct xfrm_type *type;
 208        int modload_attempted = 0;
 209
 210retry:
 211        afinfo = xfrm_state_get_afinfo(family);
 212        if (unlikely(afinfo == NULL))
 213                return NULL;
 214        typemap = afinfo->type_map;
 215
 216        type = typemap[proto];
 217        if (unlikely(type && !try_module_get(type->owner)))
 218                type = NULL;
 219        if (!type && !modload_attempted) {
 220                xfrm_state_put_afinfo(afinfo);
 221                request_module("xfrm-type-%d-%d", family, proto);
 222                modload_attempted = 1;
 223                goto retry;
 224        }
 225
 226        xfrm_state_put_afinfo(afinfo);
 227        return type;
 228}
 229
 230static void xfrm_put_type(const struct xfrm_type *type)
 231{
 232        module_put(type->owner);
 233}
 234
 235static DEFINE_SPINLOCK(xfrm_mode_lock);
 236int xfrm_register_mode(struct xfrm_mode *mode, int family)
 237{
 238        struct xfrm_state_afinfo *afinfo;
 239        struct xfrm_mode **modemap;
 240        int err;
 241
 242        if (unlikely(mode->encap >= XFRM_MODE_MAX))
 243                return -EINVAL;
 244
 245        afinfo = xfrm_state_get_afinfo(family);
 246        if (unlikely(afinfo == NULL))
 247                return -EAFNOSUPPORT;
 248
 249        err = -EEXIST;
 250        modemap = afinfo->mode_map;
 251        spin_lock_bh(&xfrm_mode_lock);
 252        if (modemap[mode->encap])
 253                goto out;
 254
 255        err = -ENOENT;
 256        if (!try_module_get(afinfo->owner))
 257                goto out;
 258
 259        mode->afinfo = afinfo;
 260        modemap[mode->encap] = mode;
 261        err = 0;
 262
 263out:
 264        spin_unlock_bh(&xfrm_mode_lock);
 265        xfrm_state_put_afinfo(afinfo);
 266        return err;
 267}
 268EXPORT_SYMBOL(xfrm_register_mode);
 269
 270int xfrm_unregister_mode(struct xfrm_mode *mode, int family)
 271{
 272        struct xfrm_state_afinfo *afinfo;
 273        struct xfrm_mode **modemap;
 274        int err;
 275
 276        if (unlikely(mode->encap >= XFRM_MODE_MAX))
 277                return -EINVAL;
 278
 279        afinfo = xfrm_state_get_afinfo(family);
 280        if (unlikely(afinfo == NULL))
 281                return -EAFNOSUPPORT;
 282
 283        err = -ENOENT;
 284        modemap = afinfo->mode_map;
 285        spin_lock_bh(&xfrm_mode_lock);
 286        if (likely(modemap[mode->encap] == mode)) {
 287                modemap[mode->encap] = NULL;
 288                module_put(mode->afinfo->owner);
 289                err = 0;
 290        }
 291
 292        spin_unlock_bh(&xfrm_mode_lock);
 293        xfrm_state_put_afinfo(afinfo);
 294        return err;
 295}
 296EXPORT_SYMBOL(xfrm_unregister_mode);
 297
 298static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
 299{
 300        struct xfrm_state_afinfo *afinfo;
 301        struct xfrm_mode *mode;
 302        int modload_attempted = 0;
 303
 304        if (unlikely(encap >= XFRM_MODE_MAX))
 305                return NULL;
 306
 307retry:
 308        afinfo = xfrm_state_get_afinfo(family);
 309        if (unlikely(afinfo == NULL))
 310                return NULL;
 311
 312        mode = afinfo->mode_map[encap];
 313        if (unlikely(mode && !try_module_get(mode->owner)))
 314                mode = NULL;
 315        if (!mode && !modload_attempted) {
 316                xfrm_state_put_afinfo(afinfo);
 317                request_module("xfrm-mode-%d-%d", family, encap);
 318                modload_attempted = 1;
 319                goto retry;
 320        }
 321
 322        xfrm_state_put_afinfo(afinfo);
 323        return mode;
 324}
 325
 326static void xfrm_put_mode(struct xfrm_mode *mode)
 327{
 328        module_put(mode->owner);
 329}
 330
 331static void xfrm_state_gc_destroy(struct xfrm_state *x)
 332{
 333        tasklet_hrtimer_cancel(&x->mtimer);
 334        del_timer_sync(&x->rtimer);
 335        kfree(x->aalg);
 336        kfree(x->ealg);
 337        kfree(x->calg);
 338        kfree(x->encap);
 339        kfree(x->coaddr);
 340        kfree(x->replay_esn);
 341        kfree(x->preplay_esn);
 342        if (x->inner_mode)
 343                xfrm_put_mode(x->inner_mode);
 344        if (x->inner_mode_iaf)
 345                xfrm_put_mode(x->inner_mode_iaf);
 346        if (x->outer_mode)
 347                xfrm_put_mode(x->outer_mode);
 348        if (x->type) {
 349                x->type->destructor(x);
 350                xfrm_put_type(x->type);
 351        }
 352        security_xfrm_state_free(x);
 353        kfree(x);
 354}
 355
 356static void xfrm_state_gc_task(struct work_struct *work)
 357{
 358        struct net *net = container_of(work, struct net, xfrm.state_gc_work);
 359        struct xfrm_state *x;
 360        struct hlist_node *tmp;
 361        struct hlist_head gc_list;
 362
 363        spin_lock_bh(&xfrm_state_gc_lock);
 364        hlist_move_list(&net->xfrm.state_gc_list, &gc_list);
 365        spin_unlock_bh(&xfrm_state_gc_lock);
 366
 367        hlist_for_each_entry_safe(x, tmp, &gc_list, gclist)
 368                xfrm_state_gc_destroy(x);
 369}
 370
 371static inline unsigned long make_jiffies(long secs)
 372{
 373        if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
 374                return MAX_SCHEDULE_TIMEOUT-1;
 375        else
 376                return secs*HZ;
 377}
 378
 379static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me)
 380{
 381        struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer);
 382        struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer);
 383        unsigned long now = get_seconds();
 384        long next = LONG_MAX;
 385        int warn = 0;
 386        int err = 0;
 387
 388        spin_lock(&x->lock);
 389        if (x->km.state == XFRM_STATE_DEAD)
 390                goto out;
 391        if (x->km.state == XFRM_STATE_EXPIRED)
 392                goto expired;
 393        if (x->lft.hard_add_expires_seconds) {
 394                long tmo = x->lft.hard_add_expires_seconds +
 395                        x->curlft.add_time - now;
 396                if (tmo <= 0) {
 397                        if (x->xflags & XFRM_SOFT_EXPIRE) {
 398                                /* enter hard expire without soft expire first?!
 399                                 * setting a new date could trigger this.
 400                                 * workarbound: fix x->curflt.add_time by below:
 401                                 */
 402                                x->curlft.add_time = now - x->saved_tmo - 1;
 403                                tmo = x->lft.hard_add_expires_seconds - x->saved_tmo;
 404                        } else
 405                                goto expired;
 406                }
 407                if (tmo < next)
 408                        next = tmo;
 409        }
 410        if (x->lft.hard_use_expires_seconds) {
 411                long tmo = x->lft.hard_use_expires_seconds +
 412                        (x->curlft.use_time ? : now) - now;
 413                if (tmo <= 0)
 414                        goto expired;
 415                if (tmo < next)
 416                        next = tmo;
 417        }
 418        if (x->km.dying)
 419                goto resched;
 420        if (x->lft.soft_add_expires_seconds) {
 421                long tmo = x->lft.soft_add_expires_seconds +
 422                        x->curlft.add_time - now;
 423                if (tmo <= 0) {
 424                        warn = 1;
 425                        x->xflags &= ~XFRM_SOFT_EXPIRE;
 426                } else if (tmo < next) {
 427                        next = tmo;
 428                        x->xflags |= XFRM_SOFT_EXPIRE;
 429                        x->saved_tmo = tmo;
 430                }
 431        }
 432        if (x->lft.soft_use_expires_seconds) {
 433                long tmo = x->lft.soft_use_expires_seconds +
 434                        (x->curlft.use_time ? : now) - now;
 435                if (tmo <= 0)
 436                        warn = 1;
 437                else if (tmo < next)
 438                        next = tmo;
 439        }
 440
 441        x->km.dying = warn;
 442        if (warn)
 443                km_state_expired(x, 0, 0);
 444resched:
 445        if (next != LONG_MAX) {
 446                tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL);
 447        }
 448
 449        goto out;
 450
 451expired:
 452        if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0)
 453                x->km.state = XFRM_STATE_EXPIRED;
 454
 455        err = __xfrm_state_delete(x);
 456        if (!err)
 457                km_state_expired(x, 1, 0);
 458
 459        xfrm_audit_state_delete(x, err ? 0 : 1, true);
 460
 461out:
 462        spin_unlock(&x->lock);
 463        return HRTIMER_NORESTART;
 464}
 465
 466static void xfrm_replay_timer_handler(unsigned long data);
 467
 468struct xfrm_state *xfrm_state_alloc(struct net *net)
 469{
 470        struct xfrm_state *x;
 471
 472        x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC);
 473
 474        if (x) {
 475                write_pnet(&x->xs_net, net);
 476                atomic_set(&x->refcnt, 1);
 477                atomic_set(&x->tunnel_users, 0);
 478                INIT_LIST_HEAD(&x->km.all);
 479                INIT_HLIST_NODE(&x->bydst);
 480                INIT_HLIST_NODE(&x->bysrc);
 481                INIT_HLIST_NODE(&x->byspi);
 482                tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler,
 483                                        CLOCK_BOOTTIME, HRTIMER_MODE_ABS);
 484                setup_timer(&x->rtimer, xfrm_replay_timer_handler,
 485                                (unsigned long)x);
 486                x->curlft.add_time = get_seconds();
 487                x->lft.soft_byte_limit = XFRM_INF;
 488                x->lft.soft_packet_limit = XFRM_INF;
 489                x->lft.hard_byte_limit = XFRM_INF;
 490                x->lft.hard_packet_limit = XFRM_INF;
 491                x->replay_maxage = 0;
 492                x->replay_maxdiff = 0;
 493                x->inner_mode = NULL;
 494                x->inner_mode_iaf = NULL;
 495                spin_lock_init(&x->lock);
 496        }
 497        return x;
 498}
 499EXPORT_SYMBOL(xfrm_state_alloc);
 500
 501void __xfrm_state_destroy(struct xfrm_state *x)
 502{
 503        struct net *net = xs_net(x);
 504
 505        WARN_ON(x->km.state != XFRM_STATE_DEAD);
 506
 507        spin_lock_bh(&xfrm_state_gc_lock);
 508        hlist_add_head(&x->gclist, &net->xfrm.state_gc_list);
 509        spin_unlock_bh(&xfrm_state_gc_lock);
 510        schedule_work(&net->xfrm.state_gc_work);
 511}
 512EXPORT_SYMBOL(__xfrm_state_destroy);
 513
 514int __xfrm_state_delete(struct xfrm_state *x)
 515{
 516        struct net *net = xs_net(x);
 517        int err = -ESRCH;
 518
 519        if (x->km.state != XFRM_STATE_DEAD) {
 520                x->km.state = XFRM_STATE_DEAD;
 521                spin_lock(&net->xfrm.xfrm_state_lock);
 522                list_del(&x->km.all);
 523                hlist_del(&x->bydst);
 524                hlist_del(&x->bysrc);
 525                if (x->id.spi)
 526                        hlist_del(&x->byspi);
 527                net->xfrm.state_num--;
 528                spin_unlock(&net->xfrm.xfrm_state_lock);
 529
 530                /* All xfrm_state objects are created by xfrm_state_alloc.
 531                 * The xfrm_state_alloc call gives a reference, and that
 532                 * is what we are dropping here.
 533                 */
 534                xfrm_state_put(x);
 535                err = 0;
 536        }
 537
 538        return err;
 539}
 540EXPORT_SYMBOL(__xfrm_state_delete);
 541
 542int xfrm_state_delete(struct xfrm_state *x)
 543{
 544        int err;
 545
 546        spin_lock_bh(&x->lock);
 547        err = __xfrm_state_delete(x);
 548        spin_unlock_bh(&x->lock);
 549
 550        return err;
 551}
 552EXPORT_SYMBOL(xfrm_state_delete);
 553
 554#ifdef CONFIG_SECURITY_NETWORK_XFRM
 555static inline int
 556xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
 557{
 558        int i, err = 0;
 559
 560        for (i = 0; i <= net->xfrm.state_hmask; i++) {
 561                struct xfrm_state *x;
 562
 563                hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
 564                        if (xfrm_id_proto_match(x->id.proto, proto) &&
 565                           (err = security_xfrm_state_delete(x)) != 0) {
 566                                xfrm_audit_state_delete(x, 0, task_valid);
 567                                return err;
 568                        }
 569                }
 570        }
 571
 572        return err;
 573}
 574#else
 575static inline int
 576xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
 577{
 578        return 0;
 579}
 580#endif
 581
 582int xfrm_state_flush(struct net *net, u8 proto, bool task_valid)
 583{
 584        int i, err = 0, cnt = 0;
 585
 586        spin_lock_bh(&net->xfrm.xfrm_state_lock);
 587        err = xfrm_state_flush_secctx_check(net, proto, task_valid);
 588        if (err)
 589                goto out;
 590
 591        err = -ESRCH;
 592        for (i = 0; i <= net->xfrm.state_hmask; i++) {
 593                struct xfrm_state *x;
 594restart:
 595                hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
 596                        if (!xfrm_state_kern(x) &&
 597                            xfrm_id_proto_match(x->id.proto, proto)) {
 598                                xfrm_state_hold(x);
 599                                spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 600
 601                                err = xfrm_state_delete(x);
 602                                xfrm_audit_state_delete(x, err ? 0 : 1,
 603                                                        task_valid);
 604                                xfrm_state_put(x);
 605                                if (!err)
 606                                        cnt++;
 607
 608                                spin_lock_bh(&net->xfrm.xfrm_state_lock);
 609                                goto restart;
 610                        }
 611                }
 612        }
 613        if (cnt)
 614                err = 0;
 615
 616out:
 617        spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 618        return err;
 619}
 620EXPORT_SYMBOL(xfrm_state_flush);
 621
 622void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
 623{
 624        spin_lock_bh(&net->xfrm.xfrm_state_lock);
 625        si->sadcnt = net->xfrm.state_num;
 626        si->sadhcnt = net->xfrm.state_hmask;
 627        si->sadhmcnt = xfrm_state_hashmax;
 628        spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 629}
 630EXPORT_SYMBOL(xfrm_sad_getinfo);
 631
 632static int
 633xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl,
 634                    const struct xfrm_tmpl *tmpl,
 635                    const xfrm_address_t *daddr, const xfrm_address_t *saddr,
 636                    unsigned short family)
 637{
 638        struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
 639        if (!afinfo)
 640                return -1;
 641        afinfo->init_tempsel(&x->sel, fl);
 642
 643        if (family != tmpl->encap_family) {
 644                xfrm_state_put_afinfo(afinfo);
 645                afinfo = xfrm_state_get_afinfo(tmpl->encap_family);
 646                if (!afinfo)
 647                        return -1;
 648        }
 649        afinfo->init_temprop(x, tmpl, daddr, saddr);
 650        xfrm_state_put_afinfo(afinfo);
 651        return 0;
 652}
 653
 654static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark,
 655                                              const xfrm_address_t *daddr,
 656                                              __be32 spi, u8 proto,
 657                                              unsigned short family)
 658{
 659        unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
 660        struct xfrm_state *x;
 661
 662        hlist_for_each_entry(x, net->xfrm.state_byspi+h, byspi) {
 663                if (x->props.family != family ||
 664                    x->id.spi       != spi ||
 665                    x->id.proto     != proto ||
 666                    !xfrm_addr_equal(&x->id.daddr, daddr, family))
 667                        continue;
 668
 669                if ((mark & x->mark.m) != x->mark.v)
 670                        continue;
 671                xfrm_state_hold(x);
 672                return x;
 673        }
 674
 675        return NULL;
 676}
 677
 678static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark,
 679                                                     const xfrm_address_t *daddr,
 680                                                     const xfrm_address_t *saddr,
 681                                                     u8 proto, unsigned short family)
 682{
 683        unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
 684        struct xfrm_state *x;
 685
 686        hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
 687                if (x->props.family != family ||
 688                    x->id.proto     != proto ||
 689                    !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
 690                    !xfrm_addr_equal(&x->props.saddr, saddr, family))
 691                        continue;
 692
 693                if ((mark & x->mark.m) != x->mark.v)
 694                        continue;
 695                xfrm_state_hold(x);
 696                return x;
 697        }
 698
 699        return NULL;
 700}
 701
 702static inline struct xfrm_state *
 703__xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
 704{
 705        struct net *net = xs_net(x);
 706        u32 mark = x->mark.v & x->mark.m;
 707
 708        if (use_spi)
 709                return __xfrm_state_lookup(net, mark, &x->id.daddr,
 710                                           x->id.spi, x->id.proto, family);
 711        else
 712                return __xfrm_state_lookup_byaddr(net, mark,
 713                                                  &x->id.daddr,
 714                                                  &x->props.saddr,
 715                                                  x->id.proto, family);
 716}
 717
 718static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
 719{
 720        if (have_hash_collision &&
 721            (net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
 722            net->xfrm.state_num > net->xfrm.state_hmask)
 723                schedule_work(&net->xfrm.state_hash_work);
 724}
 725
 726static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
 727                               const struct flowi *fl, unsigned short family,
 728                               struct xfrm_state **best, int *acq_in_progress,
 729                               int *error)
 730{
 731        /* Resolution logic:
 732         * 1. There is a valid state with matching selector. Done.
 733         * 2. Valid state with inappropriate selector. Skip.
 734         *
 735         * Entering area of "sysdeps".
 736         *
 737         * 3. If state is not valid, selector is temporary, it selects
 738         *    only session which triggered previous resolution. Key
 739         *    manager will do something to install a state with proper
 740         *    selector.
 741         */
 742        if (x->km.state == XFRM_STATE_VALID) {
 743                if ((x->sel.family &&
 744                     !xfrm_selector_match(&x->sel, fl, x->sel.family)) ||
 745                    !security_xfrm_state_pol_flow_match(x, pol, fl))
 746                        return;
 747
 748                if (!*best ||
 749                    (*best)->km.dying > x->km.dying ||
 750                    ((*best)->km.dying == x->km.dying &&
 751                     (*best)->curlft.add_time < x->curlft.add_time))
 752                        *best = x;
 753        } else if (x->km.state == XFRM_STATE_ACQ) {
 754                *acq_in_progress = 1;
 755        } else if (x->km.state == XFRM_STATE_ERROR ||
 756                   x->km.state == XFRM_STATE_EXPIRED) {
 757                if (xfrm_selector_match(&x->sel, fl, x->sel.family) &&
 758                    security_xfrm_state_pol_flow_match(x, pol, fl))
 759                        *error = -ESRCH;
 760        }
 761}
 762
 763struct xfrm_state *
 764xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
 765                const struct flowi *fl, struct xfrm_tmpl *tmpl,
 766                struct xfrm_policy *pol, int *err,
 767                unsigned short family)
 768{
 769        static xfrm_address_t saddr_wildcard = { };
 770        struct net *net = xp_net(pol);
 771        unsigned int h, h_wildcard;
 772        struct xfrm_state *x, *x0, *to_put;
 773        int acquire_in_progress = 0;
 774        int error = 0;
 775        struct xfrm_state *best = NULL;
 776        u32 mark = pol->mark.v & pol->mark.m;
 777        unsigned short encap_family = tmpl->encap_family;
 778        struct km_event c;
 779
 780        to_put = NULL;
 781
 782        spin_lock_bh(&net->xfrm.xfrm_state_lock);
 783        h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family);
 784        hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
 785                if (x->props.family == encap_family &&
 786                    x->props.reqid == tmpl->reqid &&
 787                    (mark & x->mark.m) == x->mark.v &&
 788                    !(x->props.flags & XFRM_STATE_WILDRECV) &&
 789                    xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
 790                    tmpl->mode == x->props.mode &&
 791                    tmpl->id.proto == x->id.proto &&
 792                    (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
 793                        xfrm_state_look_at(pol, x, fl, encap_family,
 794                                           &best, &acquire_in_progress, &error);
 795        }
 796        if (best || acquire_in_progress)
 797                goto found;
 798
 799        h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family);
 800        hlist_for_each_entry(x, net->xfrm.state_bydst+h_wildcard, bydst) {
 801                if (x->props.family == encap_family &&
 802                    x->props.reqid == tmpl->reqid &&
 803                    (mark & x->mark.m) == x->mark.v &&
 804                    !(x->props.flags & XFRM_STATE_WILDRECV) &&
 805                    xfrm_addr_equal(&x->id.daddr, daddr, encap_family) &&
 806                    tmpl->mode == x->props.mode &&
 807                    tmpl->id.proto == x->id.proto &&
 808                    (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
 809                        xfrm_state_look_at(pol, x, fl, encap_family,
 810                                           &best, &acquire_in_progress, &error);
 811        }
 812
 813found:
 814        x = best;
 815        if (!x && !error && !acquire_in_progress) {
 816                if (tmpl->id.spi &&
 817                    (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi,
 818                                              tmpl->id.proto, encap_family)) != NULL) {
 819                        to_put = x0;
 820                        error = -EEXIST;
 821                        goto out;
 822                }
 823
 824                c.net = net;
 825                /* If the KMs have no listeners (yet...), avoid allocating an SA
 826                 * for each and every packet - garbage collection might not
 827                 * handle the flood.
 828                 */
 829                if (!km_is_alive(&c)) {
 830                        error = -ESRCH;
 831                        goto out;
 832                }
 833
 834                x = xfrm_state_alloc(net);
 835                if (x == NULL) {
 836                        error = -ENOMEM;
 837                        goto out;
 838                }
 839                /* Initialize temporary state matching only
 840                 * to current session. */
 841                xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family);
 842                memcpy(&x->mark, &pol->mark, sizeof(x->mark));
 843
 844                error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid);
 845                if (error) {
 846                        x->km.state = XFRM_STATE_DEAD;
 847                        to_put = x;
 848                        x = NULL;
 849                        goto out;
 850                }
 851
 852                if (km_query(x, tmpl, pol) == 0) {
 853                        x->km.state = XFRM_STATE_ACQ;
 854                        list_add(&x->km.all, &net->xfrm.state_all);
 855                        hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
 856                        h = xfrm_src_hash(net, daddr, saddr, encap_family);
 857                        hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
 858                        if (x->id.spi) {
 859                                h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family);
 860                                hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
 861                        }
 862                        x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
 863                        tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
 864                        net->xfrm.state_num++;
 865                        xfrm_hash_grow_check(net, x->bydst.next != NULL);
 866                } else {
 867                        x->km.state = XFRM_STATE_DEAD;
 868                        to_put = x;
 869                        x = NULL;
 870                        error = -ESRCH;
 871                }
 872        }
 873out:
 874        if (x)
 875                xfrm_state_hold(x);
 876        else
 877                *err = acquire_in_progress ? -EAGAIN : error;
 878        spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 879        if (to_put)
 880                xfrm_state_put(to_put);
 881        return x;
 882}
 883
 884struct xfrm_state *
 885xfrm_stateonly_find(struct net *net, u32 mark,
 886                    xfrm_address_t *daddr, xfrm_address_t *saddr,
 887                    unsigned short family, u8 mode, u8 proto, u32 reqid)
 888{
 889        unsigned int h;
 890        struct xfrm_state *rx = NULL, *x = NULL;
 891
 892        spin_lock_bh(&net->xfrm.xfrm_state_lock);
 893        h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
 894        hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
 895                if (x->props.family == family &&
 896                    x->props.reqid == reqid &&
 897                    (mark & x->mark.m) == x->mark.v &&
 898                    !(x->props.flags & XFRM_STATE_WILDRECV) &&
 899                    xfrm_state_addr_check(x, daddr, saddr, family) &&
 900                    mode == x->props.mode &&
 901                    proto == x->id.proto &&
 902                    x->km.state == XFRM_STATE_VALID) {
 903                        rx = x;
 904                        break;
 905                }
 906        }
 907
 908        if (rx)
 909                xfrm_state_hold(rx);
 910        spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 911
 912
 913        return rx;
 914}
 915EXPORT_SYMBOL(xfrm_stateonly_find);
 916
 917struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
 918                                              unsigned short family)
 919{
 920        struct xfrm_state *x;
 921        struct xfrm_state_walk *w;
 922
 923        spin_lock_bh(&net->xfrm.xfrm_state_lock);
 924        list_for_each_entry(w, &net->xfrm.state_all, all) {
 925                x = container_of(w, struct xfrm_state, km);
 926                if (x->props.family != family ||
 927                        x->id.spi != spi)
 928                        continue;
 929
 930                xfrm_state_hold(x);
 931                spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 932                return x;
 933        }
 934        spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 935        return NULL;
 936}
 937EXPORT_SYMBOL(xfrm_state_lookup_byspi);
 938
 939static void __xfrm_state_insert(struct xfrm_state *x)
 940{
 941        struct net *net = xs_net(x);
 942        unsigned int h;
 943
 944        list_add(&x->km.all, &net->xfrm.state_all);
 945
 946        h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
 947                          x->props.reqid, x->props.family);
 948        hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
 949
 950        h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
 951        hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
 952
 953        if (x->id.spi) {
 954                h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
 955                                  x->props.family);
 956
 957                hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
 958        }
 959
 960        tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
 961        if (x->replay_maxage)
 962                mod_timer(&x->rtimer, jiffies + x->replay_maxage);
 963
 964        net->xfrm.state_num++;
 965
 966        xfrm_hash_grow_check(net, x->bydst.next != NULL);
 967}
 968
 969/* net->xfrm.xfrm_state_lock is held */
 970static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
 971{
 972        struct net *net = xs_net(xnew);
 973        unsigned short family = xnew->props.family;
 974        u32 reqid = xnew->props.reqid;
 975        struct xfrm_state *x;
 976        unsigned int h;
 977        u32 mark = xnew->mark.v & xnew->mark.m;
 978
 979        h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
 980        hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
 981                if (x->props.family     == family &&
 982                    x->props.reqid      == reqid &&
 983                    (mark & x->mark.m) == x->mark.v &&
 984                    xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) &&
 985                    xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family))
 986                        x->genid++;
 987        }
 988}
 989
 990void xfrm_state_insert(struct xfrm_state *x)
 991{
 992        struct net *net = xs_net(x);
 993
 994        spin_lock_bh(&net->xfrm.xfrm_state_lock);
 995        __xfrm_state_bump_genids(x);
 996        __xfrm_state_insert(x);
 997        spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 998}
 999EXPORT_SYMBOL(xfrm_state_insert);
1000
1001/* net->xfrm.xfrm_state_lock is held */
1002static struct xfrm_state *__find_acq_core(struct net *net,
1003                                          const struct xfrm_mark *m,
1004                                          unsigned short family, u8 mode,
1005                                          u32 reqid, u8 proto,
1006                                          const xfrm_address_t *daddr,
1007                                          const xfrm_address_t *saddr,
1008                                          int create)
1009{
1010        unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1011        struct xfrm_state *x;
1012        u32 mark = m->v & m->m;
1013
1014        hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1015                if (x->props.reqid  != reqid ||
1016                    x->props.mode   != mode ||
1017                    x->props.family != family ||
1018                    x->km.state     != XFRM_STATE_ACQ ||
1019                    x->id.spi       != 0 ||
1020                    x->id.proto     != proto ||
1021                    (mark & x->mark.m) != x->mark.v ||
1022                    !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
1023                    !xfrm_addr_equal(&x->props.saddr, saddr, family))
1024                        continue;
1025
1026                xfrm_state_hold(x);
1027                return x;
1028        }
1029
1030        if (!create)
1031                return NULL;
1032
1033        x = xfrm_state_alloc(net);
1034        if (likely(x)) {
1035                switch (family) {
1036                case AF_INET:
1037                        x->sel.daddr.a4 = daddr->a4;
1038                        x->sel.saddr.a4 = saddr->a4;
1039                        x->sel.prefixlen_d = 32;
1040                        x->sel.prefixlen_s = 32;
1041                        x->props.saddr.a4 = saddr->a4;
1042                        x->id.daddr.a4 = daddr->a4;
1043                        break;
1044
1045                case AF_INET6:
1046                        x->sel.daddr.in6 = daddr->in6;
1047                        x->sel.saddr.in6 = saddr->in6;
1048                        x->sel.prefixlen_d = 128;
1049                        x->sel.prefixlen_s = 128;
1050                        x->props.saddr.in6 = saddr->in6;
1051                        x->id.daddr.in6 = daddr->in6;
1052                        break;
1053                }
1054
1055                x->km.state = XFRM_STATE_ACQ;
1056                x->id.proto = proto;
1057                x->props.family = family;
1058                x->props.mode = mode;
1059                x->props.reqid = reqid;
1060                x->mark.v = m->v;
1061                x->mark.m = m->m;
1062                x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1063                xfrm_state_hold(x);
1064                tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
1065                list_add(&x->km.all, &net->xfrm.state_all);
1066                hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
1067                h = xfrm_src_hash(net, daddr, saddr, family);
1068                hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
1069
1070                net->xfrm.state_num++;
1071
1072                xfrm_hash_grow_check(net, x->bydst.next != NULL);
1073        }
1074
1075        return x;
1076}
1077
1078static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1079
1080int xfrm_state_add(struct xfrm_state *x)
1081{
1082        struct net *net = xs_net(x);
1083        struct xfrm_state *x1, *to_put;
1084        int family;
1085        int err;
1086        u32 mark = x->mark.v & x->mark.m;
1087        int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1088
1089        family = x->props.family;
1090
1091        to_put = NULL;
1092
1093        spin_lock_bh(&net->xfrm.xfrm_state_lock);
1094
1095        x1 = __xfrm_state_locate(x, use_spi, family);
1096        if (x1) {
1097                to_put = x1;
1098                x1 = NULL;
1099                err = -EEXIST;
1100                goto out;
1101        }
1102
1103        if (use_spi && x->km.seq) {
1104                x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq);
1105                if (x1 && ((x1->id.proto != x->id.proto) ||
1106                    !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) {
1107                        to_put = x1;
1108                        x1 = NULL;
1109                }
1110        }
1111
1112        if (use_spi && !x1)
1113                x1 = __find_acq_core(net, &x->mark, family, x->props.mode,
1114                                     x->props.reqid, x->id.proto,
1115                                     &x->id.daddr, &x->props.saddr, 0);
1116
1117        __xfrm_state_bump_genids(x);
1118        __xfrm_state_insert(x);
1119        err = 0;
1120
1121out:
1122        spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1123
1124        if (x1) {
1125                xfrm_state_delete(x1);
1126                xfrm_state_put(x1);
1127        }
1128
1129        if (to_put)
1130                xfrm_state_put(to_put);
1131
1132        return err;
1133}
1134EXPORT_SYMBOL(xfrm_state_add);
1135
1136#ifdef CONFIG_XFRM_MIGRATE
1137static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig)
1138{
1139        struct net *net = xs_net(orig);
1140        struct xfrm_state *x = xfrm_state_alloc(net);
1141        if (!x)
1142                goto out;
1143
1144        memcpy(&x->id, &orig->id, sizeof(x->id));
1145        memcpy(&x->sel, &orig->sel, sizeof(x->sel));
1146        memcpy(&x->lft, &orig->lft, sizeof(x->lft));
1147        x->props.mode = orig->props.mode;
1148        x->props.replay_window = orig->props.replay_window;
1149        x->props.reqid = orig->props.reqid;
1150        x->props.family = orig->props.family;
1151        x->props.saddr = orig->props.saddr;
1152
1153        if (orig->aalg) {
1154                x->aalg = xfrm_algo_auth_clone(orig->aalg);
1155                if (!x->aalg)
1156                        goto error;
1157        }
1158        x->props.aalgo = orig->props.aalgo;
1159
1160        if (orig->aead) {
1161                x->aead = xfrm_algo_aead_clone(orig->aead);
1162                if (!x->aead)
1163                        goto error;
1164        }
1165        if (orig->ealg) {
1166                x->ealg = xfrm_algo_clone(orig->ealg);
1167                if (!x->ealg)
1168                        goto error;
1169        }
1170        x->props.ealgo = orig->props.ealgo;
1171
1172        if (orig->calg) {
1173                x->calg = xfrm_algo_clone(orig->calg);
1174                if (!x->calg)
1175                        goto error;
1176        }
1177        x->props.calgo = orig->props.calgo;
1178
1179        if (orig->encap) {
1180                x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL);
1181                if (!x->encap)
1182                        goto error;
1183        }
1184
1185        if (orig->coaddr) {
1186                x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1187                                    GFP_KERNEL);
1188                if (!x->coaddr)
1189                        goto error;
1190        }
1191
1192        if (orig->replay_esn) {
1193                if (xfrm_replay_clone(x, orig))
1194                        goto error;
1195        }
1196
1197        memcpy(&x->mark, &orig->mark, sizeof(x->mark));
1198
1199        if (xfrm_init_state(x) < 0)
1200                goto error;
1201
1202        x->props.flags = orig->props.flags;
1203        x->props.extra_flags = orig->props.extra_flags;
1204
1205        x->tfcpad = orig->tfcpad;
1206        x->replay_maxdiff = orig->replay_maxdiff;
1207        x->replay_maxage = orig->replay_maxage;
1208        x->curlft.add_time = orig->curlft.add_time;
1209        x->km.state = orig->km.state;
1210        x->km.seq = orig->km.seq;
1211
1212        return x;
1213
1214 error:
1215        xfrm_state_put(x);
1216out:
1217        return NULL;
1218}
1219
1220struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net)
1221{
1222        unsigned int h;
1223        struct xfrm_state *x = NULL;
1224
1225        spin_lock_bh(&net->xfrm.xfrm_state_lock);
1226
1227        if (m->reqid) {
1228                h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr,
1229                                  m->reqid, m->old_family);
1230                hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1231                        if (x->props.mode != m->mode ||
1232                            x->id.proto != m->proto)
1233                                continue;
1234                        if (m->reqid && x->props.reqid != m->reqid)
1235                                continue;
1236                        if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1237                                             m->old_family) ||
1238                            !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1239                                             m->old_family))
1240                                continue;
1241                        xfrm_state_hold(x);
1242                        break;
1243                }
1244        } else {
1245                h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr,
1246                                  m->old_family);
1247                hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
1248                        if (x->props.mode != m->mode ||
1249                            x->id.proto != m->proto)
1250                                continue;
1251                        if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1252                                             m->old_family) ||
1253                            !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1254                                             m->old_family))
1255                                continue;
1256                        xfrm_state_hold(x);
1257                        break;
1258                }
1259        }
1260
1261        spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1262
1263        return x;
1264}
1265EXPORT_SYMBOL(xfrm_migrate_state_find);
1266
1267struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1268                                      struct xfrm_migrate *m)
1269{
1270        struct xfrm_state *xc;
1271
1272        xc = xfrm_state_clone(x);
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_equal(&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 (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        struct net *net = xs_net(x);
1303
1304        to_put = NULL;
1305
1306        spin_lock_bh(&net->xfrm.xfrm_state_lock);
1307        x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1308
1309        err = -ESRCH;
1310        if (!x1)
1311                goto out;
1312
1313        if (xfrm_state_kern(x1)) {
1314                to_put = x1;
1315                err = -EEXIST;
1316                goto out;
1317        }
1318
1319        if (x1->km.state == XFRM_STATE_ACQ) {
1320                __xfrm_state_insert(x);
1321                x = NULL;
1322        }
1323        err = 0;
1324
1325out:
1326        spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1327
1328        if (to_put)
1329                xfrm_state_put(to_put);
1330
1331        if (err)
1332                return err;
1333
1334        if (!x) {
1335                xfrm_state_delete(x1);
1336                xfrm_state_put(x1);
1337                return 0;
1338        }
1339
1340        err = -EINVAL;
1341        spin_lock_bh(&x1->lock);
1342        if (likely(x1->km.state == XFRM_STATE_VALID)) {
1343                if (x->encap && x1->encap)
1344                        memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1345                if (x->coaddr && x1->coaddr) {
1346                        memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1347                }
1348                if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1349                        memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1350                memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1351                x1->km.dying = 0;
1352
1353                tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
1354                if (x1->curlft.use_time)
1355                        xfrm_state_check_expire(x1);
1356
1357                err = 0;
1358                x->km.state = XFRM_STATE_DEAD;
1359                __xfrm_state_put(x);
1360        }
1361        spin_unlock_bh(&x1->lock);
1362
1363        xfrm_state_put(x1);
1364
1365        return err;
1366}
1367EXPORT_SYMBOL(xfrm_state_update);
1368
1369int xfrm_state_check_expire(struct xfrm_state *x)
1370{
1371        if (!x->curlft.use_time)
1372                x->curlft.use_time = get_seconds();
1373
1374        if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1375            x->curlft.packets >= x->lft.hard_packet_limit) {
1376                x->km.state = XFRM_STATE_EXPIRED;
1377                tasklet_hrtimer_start(&x->mtimer, ktime_set(0, 0), HRTIMER_MODE_REL);
1378                return -EINVAL;
1379        }
1380
1381        if (!x->km.dying &&
1382            (x->curlft.bytes >= x->lft.soft_byte_limit ||
1383             x->curlft.packets >= x->lft.soft_packet_limit)) {
1384                x->km.dying = 1;
1385                km_state_expired(x, 0, 0);
1386        }
1387        return 0;
1388}
1389EXPORT_SYMBOL(xfrm_state_check_expire);
1390
1391struct xfrm_state *
1392xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi,
1393                  u8 proto, unsigned short family)
1394{
1395        struct xfrm_state *x;
1396
1397        spin_lock_bh(&net->xfrm.xfrm_state_lock);
1398        x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
1399        spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1400        return x;
1401}
1402EXPORT_SYMBOL(xfrm_state_lookup);
1403
1404struct xfrm_state *
1405xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1406                         const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1407                         u8 proto, unsigned short family)
1408{
1409        struct xfrm_state *x;
1410
1411        spin_lock_bh(&net->xfrm.xfrm_state_lock);
1412        x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
1413        spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1414        return x;
1415}
1416EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1417
1418struct xfrm_state *
1419xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid,
1420              u8 proto, const xfrm_address_t *daddr,
1421              const xfrm_address_t *saddr, int create, unsigned short family)
1422{
1423        struct xfrm_state *x;
1424
1425        spin_lock_bh(&net->xfrm.xfrm_state_lock);
1426        x = __find_acq_core(net, mark, family, mode, reqid, proto, daddr, saddr, create);
1427        spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1428
1429        return x;
1430}
1431EXPORT_SYMBOL(xfrm_find_acq);
1432
1433#ifdef CONFIG_XFRM_SUB_POLICY
1434int
1435xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1436               unsigned short family, struct net *net)
1437{
1438        int err = 0;
1439        struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1440        if (!afinfo)
1441                return -EAFNOSUPPORT;
1442
1443        spin_lock_bh(&net->xfrm.xfrm_state_lock); /*FIXME*/
1444        if (afinfo->tmpl_sort)
1445                err = afinfo->tmpl_sort(dst, src, n);
1446        spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1447        xfrm_state_put_afinfo(afinfo);
1448        return err;
1449}
1450EXPORT_SYMBOL(xfrm_tmpl_sort);
1451
1452int
1453xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1454                unsigned short family)
1455{
1456        int err = 0;
1457        struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1458        struct net *net = xs_net(*src);
1459
1460        if (!afinfo)
1461                return -EAFNOSUPPORT;
1462
1463        spin_lock_bh(&net->xfrm.xfrm_state_lock);
1464        if (afinfo->state_sort)
1465                err = afinfo->state_sort(dst, src, n);
1466        spin_unlock_bh(&net->xfrm.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 xfrm_state *x;
1481
1482                hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
1483                        if (x->km.seq == seq &&
1484                            (mark & x->mark.m) == x->mark.v &&
1485                            x->km.state == XFRM_STATE_ACQ) {
1486                                xfrm_state_hold(x);
1487                                return x;
1488                        }
1489                }
1490        }
1491        return NULL;
1492}
1493
1494struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1495{
1496        struct xfrm_state *x;
1497
1498        spin_lock_bh(&net->xfrm.xfrm_state_lock);
1499        x = __xfrm_find_acq_byseq(net, mark, seq);
1500        spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1501        return x;
1502}
1503EXPORT_SYMBOL(xfrm_find_acq_byseq);
1504
1505u32 xfrm_get_acqseq(void)
1506{
1507        u32 res;
1508        static atomic_t acqseq;
1509
1510        do {
1511                res = atomic_inc_return(&acqseq);
1512        } while (!res);
1513
1514        return res;
1515}
1516EXPORT_SYMBOL(xfrm_get_acqseq);
1517
1518int verify_spi_info(u8 proto, u32 min, u32 max)
1519{
1520        switch (proto) {
1521        case IPPROTO_AH:
1522        case IPPROTO_ESP:
1523                break;
1524
1525        case IPPROTO_COMP:
1526                /* IPCOMP spi is 16-bits. */
1527                if (max >= 0x10000)
1528                        return -EINVAL;
1529                break;
1530
1531        default:
1532                return -EINVAL;
1533        }
1534
1535        if (min > max)
1536                return -EINVAL;
1537
1538        return 0;
1539}
1540EXPORT_SYMBOL(verify_spi_info);
1541
1542int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
1543{
1544        struct net *net = xs_net(x);
1545        unsigned int h;
1546        struct xfrm_state *x0;
1547        int err = -ENOENT;
1548        __be32 minspi = htonl(low);
1549        __be32 maxspi = htonl(high);
1550        u32 mark = x->mark.v & x->mark.m;
1551
1552        spin_lock_bh(&x->lock);
1553        if (x->km.state == XFRM_STATE_DEAD)
1554                goto unlock;
1555
1556        err = 0;
1557        if (x->id.spi)
1558                goto unlock;
1559
1560        err = -ENOENT;
1561
1562        if (minspi == maxspi) {
1563                x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
1564                if (x0) {
1565                        xfrm_state_put(x0);
1566                        goto unlock;
1567                }
1568                x->id.spi = minspi;
1569        } else {
1570                u32 spi = 0;
1571                for (h = 0; h < high-low+1; h++) {
1572                        spi = low + prandom_u32()%(high-low+1);
1573                        x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
1574                        if (x0 == NULL) {
1575                                x->id.spi = htonl(spi);
1576                                break;
1577                        }
1578                        xfrm_state_put(x0);
1579                }
1580        }
1581        if (x->id.spi) {
1582                spin_lock_bh(&net->xfrm.xfrm_state_lock);
1583                h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
1584                hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
1585                spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1586
1587                err = 0;
1588        }
1589
1590unlock:
1591        spin_unlock_bh(&x->lock);
1592
1593        return err;
1594}
1595EXPORT_SYMBOL(xfrm_alloc_spi);
1596
1597static bool __xfrm_state_filter_match(struct xfrm_state *x,
1598                                      struct xfrm_address_filter *filter)
1599{
1600        if (filter) {
1601                if ((filter->family == AF_INET ||
1602                     filter->family == AF_INET6) &&
1603                    x->props.family != filter->family)
1604                        return false;
1605
1606                return addr_match(&x->props.saddr, &filter->saddr,
1607                                  filter->splen) &&
1608                       addr_match(&x->id.daddr, &filter->daddr,
1609                                  filter->dplen);
1610        }
1611        return true;
1612}
1613
1614int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1615                    int (*func)(struct xfrm_state *, int, void*),
1616                    void *data)
1617{
1618        struct xfrm_state *state;
1619        struct xfrm_state_walk *x;
1620        int err = 0;
1621
1622        if (walk->seq != 0 && list_empty(&walk->all))
1623                return 0;
1624
1625        spin_lock_bh(&net->xfrm.xfrm_state_lock);
1626        if (list_empty(&walk->all))
1627                x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
1628        else
1629                x = list_first_entry(&walk->all, struct xfrm_state_walk, all);
1630        list_for_each_entry_from(x, &net->xfrm.state_all, all) {
1631                if (x->state == XFRM_STATE_DEAD)
1632                        continue;
1633                state = container_of(x, struct xfrm_state, km);
1634                if (!xfrm_id_proto_match(state->id.proto, walk->proto))
1635                        continue;
1636                if (!__xfrm_state_filter_match(state, walk->filter))
1637                        continue;
1638                err = func(state, walk->seq, data);
1639                if (err) {
1640                        list_move_tail(&walk->all, &x->all);
1641                        goto out;
1642                }
1643                walk->seq++;
1644        }
1645        if (walk->seq == 0) {
1646                err = -ENOENT;
1647                goto out;
1648        }
1649        list_del_init(&walk->all);
1650out:
1651        spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1652        return err;
1653}
1654EXPORT_SYMBOL(xfrm_state_walk);
1655
1656void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1657                          struct xfrm_address_filter *filter)
1658{
1659        INIT_LIST_HEAD(&walk->all);
1660        walk->proto = proto;
1661        walk->state = XFRM_STATE_DEAD;
1662        walk->seq = 0;
1663        walk->filter = filter;
1664}
1665EXPORT_SYMBOL(xfrm_state_walk_init);
1666
1667void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net)
1668{
1669        kfree(walk->filter);
1670
1671        if (list_empty(&walk->all))
1672                return;
1673
1674        spin_lock_bh(&net->xfrm.xfrm_state_lock);
1675        list_del(&walk->all);
1676        spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1677}
1678EXPORT_SYMBOL(xfrm_state_walk_done);
1679
1680static void xfrm_replay_timer_handler(unsigned long data)
1681{
1682        struct xfrm_state *x = (struct xfrm_state *)data;
1683
1684        spin_lock(&x->lock);
1685
1686        if (x->km.state == XFRM_STATE_VALID) {
1687                if (xfrm_aevent_is_on(xs_net(x)))
1688                        x->repl->notify(x, XFRM_REPLAY_TIMEOUT);
1689                else
1690                        x->xflags |= XFRM_TIME_DEFER;
1691        }
1692
1693        spin_unlock(&x->lock);
1694}
1695
1696static LIST_HEAD(xfrm_km_list);
1697
1698void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
1699{
1700        struct xfrm_mgr *km;
1701
1702        rcu_read_lock();
1703        list_for_each_entry_rcu(km, &xfrm_km_list, list)
1704                if (km->notify_policy)
1705                        km->notify_policy(xp, dir, c);
1706        rcu_read_unlock();
1707}
1708
1709void km_state_notify(struct xfrm_state *x, const struct km_event *c)
1710{
1711        struct xfrm_mgr *km;
1712        rcu_read_lock();
1713        list_for_each_entry_rcu(km, &xfrm_km_list, list)
1714                if (km->notify)
1715                        km->notify(x, c);
1716        rcu_read_unlock();
1717}
1718
1719EXPORT_SYMBOL(km_policy_notify);
1720EXPORT_SYMBOL(km_state_notify);
1721
1722void km_state_expired(struct xfrm_state *x, int hard, u32 portid)
1723{
1724        struct km_event c;
1725
1726        c.data.hard = hard;
1727        c.portid = portid;
1728        c.event = XFRM_MSG_EXPIRE;
1729        km_state_notify(x, &c);
1730}
1731
1732EXPORT_SYMBOL(km_state_expired);
1733/*
1734 * We send to all registered managers regardless of failure
1735 * We are happy with one success
1736*/
1737int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
1738{
1739        int err = -EINVAL, acqret;
1740        struct xfrm_mgr *km;
1741
1742        rcu_read_lock();
1743        list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1744                acqret = km->acquire(x, t, pol);
1745                if (!acqret)
1746                        err = acqret;
1747        }
1748        rcu_read_unlock();
1749        return err;
1750}
1751EXPORT_SYMBOL(km_query);
1752
1753int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
1754{
1755        int err = -EINVAL;
1756        struct xfrm_mgr *km;
1757
1758        rcu_read_lock();
1759        list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1760                if (km->new_mapping)
1761                        err = km->new_mapping(x, ipaddr, sport);
1762                if (!err)
1763                        break;
1764        }
1765        rcu_read_unlock();
1766        return err;
1767}
1768EXPORT_SYMBOL(km_new_mapping);
1769
1770void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid)
1771{
1772        struct km_event c;
1773
1774        c.data.hard = hard;
1775        c.portid = portid;
1776        c.event = XFRM_MSG_POLEXPIRE;
1777        km_policy_notify(pol, dir, &c);
1778}
1779EXPORT_SYMBOL(km_policy_expired);
1780
1781#ifdef CONFIG_XFRM_MIGRATE
1782int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1783               const struct xfrm_migrate *m, int num_migrate,
1784               const struct xfrm_kmaddress *k)
1785{
1786        int err = -EINVAL;
1787        int ret;
1788        struct xfrm_mgr *km;
1789
1790        rcu_read_lock();
1791        list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1792                if (km->migrate) {
1793                        ret = km->migrate(sel, dir, type, m, num_migrate, k);
1794                        if (!ret)
1795                                err = ret;
1796                }
1797        }
1798        rcu_read_unlock();
1799        return err;
1800}
1801EXPORT_SYMBOL(km_migrate);
1802#endif
1803
1804int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
1805{
1806        int err = -EINVAL;
1807        int ret;
1808        struct xfrm_mgr *km;
1809
1810        rcu_read_lock();
1811        list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1812                if (km->report) {
1813                        ret = km->report(net, proto, sel, addr);
1814                        if (!ret)
1815                                err = ret;
1816                }
1817        }
1818        rcu_read_unlock();
1819        return err;
1820}
1821EXPORT_SYMBOL(km_report);
1822
1823bool km_is_alive(const struct km_event *c)
1824{
1825        struct xfrm_mgr *km;
1826        bool is_alive = false;
1827
1828        rcu_read_lock();
1829        list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1830                if (km->is_alive && km->is_alive(c)) {
1831                        is_alive = true;
1832                        break;
1833                }
1834        }
1835        rcu_read_unlock();
1836
1837        return is_alive;
1838}
1839EXPORT_SYMBOL(km_is_alive);
1840
1841int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1842{
1843        int err;
1844        u8 *data;
1845        struct xfrm_mgr *km;
1846        struct xfrm_policy *pol = NULL;
1847
1848        if (optlen <= 0 || optlen > PAGE_SIZE)
1849                return -EMSGSIZE;
1850
1851        data = kmalloc(optlen, GFP_KERNEL);
1852        if (!data)
1853                return -ENOMEM;
1854
1855        err = -EFAULT;
1856        if (copy_from_user(data, optval, optlen))
1857                goto out;
1858
1859        err = -EINVAL;
1860        rcu_read_lock();
1861        list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1862                pol = km->compile_policy(sk, optname, data,
1863                                         optlen, &err);
1864                if (err >= 0)
1865                        break;
1866        }
1867        rcu_read_unlock();
1868
1869        if (err >= 0) {
1870                xfrm_sk_policy_insert(sk, err, pol);
1871                xfrm_pol_put(pol);
1872                err = 0;
1873        }
1874
1875out:
1876        kfree(data);
1877        return err;
1878}
1879EXPORT_SYMBOL(xfrm_user_policy);
1880
1881static DEFINE_SPINLOCK(xfrm_km_lock);
1882
1883int xfrm_register_km(struct xfrm_mgr *km)
1884{
1885        spin_lock_bh(&xfrm_km_lock);
1886        list_add_tail_rcu(&km->list, &xfrm_km_list);
1887        spin_unlock_bh(&xfrm_km_lock);
1888        return 0;
1889}
1890EXPORT_SYMBOL(xfrm_register_km);
1891
1892int xfrm_unregister_km(struct xfrm_mgr *km)
1893{
1894        spin_lock_bh(&xfrm_km_lock);
1895        list_del_rcu(&km->list);
1896        spin_unlock_bh(&xfrm_km_lock);
1897        synchronize_rcu();
1898        return 0;
1899}
1900EXPORT_SYMBOL(xfrm_unregister_km);
1901
1902int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
1903{
1904        int err = 0;
1905        if (unlikely(afinfo == NULL))
1906                return -EINVAL;
1907        if (unlikely(afinfo->family >= NPROTO))
1908                return -EAFNOSUPPORT;
1909        spin_lock_bh(&xfrm_state_afinfo_lock);
1910        if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
1911                err = -EEXIST;
1912        else
1913                rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo);
1914        spin_unlock_bh(&xfrm_state_afinfo_lock);
1915        return err;
1916}
1917EXPORT_SYMBOL(xfrm_state_register_afinfo);
1918
1919int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
1920{
1921        int err = 0;
1922        if (unlikely(afinfo == NULL))
1923                return -EINVAL;
1924        if (unlikely(afinfo->family >= NPROTO))
1925                return -EAFNOSUPPORT;
1926        spin_lock_bh(&xfrm_state_afinfo_lock);
1927        if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
1928                if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo))
1929                        err = -EINVAL;
1930                else
1931                        RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL);
1932        }
1933        spin_unlock_bh(&xfrm_state_afinfo_lock);
1934        synchronize_rcu();
1935        return err;
1936}
1937EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
1938
1939struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
1940{
1941        struct xfrm_state_afinfo *afinfo;
1942        if (unlikely(family >= NPROTO))
1943                return NULL;
1944        rcu_read_lock();
1945        afinfo = rcu_dereference(xfrm_state_afinfo[family]);
1946        if (unlikely(!afinfo))
1947                rcu_read_unlock();
1948        return afinfo;
1949}
1950
1951void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo)
1952{
1953        rcu_read_unlock();
1954}
1955
1956/* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
1957void xfrm_state_delete_tunnel(struct xfrm_state *x)
1958{
1959        if (x->tunnel) {
1960                struct xfrm_state *t = x->tunnel;
1961
1962                if (atomic_read(&t->tunnel_users) == 2)
1963                        xfrm_state_delete(t);
1964                atomic_dec(&t->tunnel_users);
1965                xfrm_state_put(t);
1966                x->tunnel = NULL;
1967        }
1968}
1969EXPORT_SYMBOL(xfrm_state_delete_tunnel);
1970
1971int xfrm_state_mtu(struct xfrm_state *x, int mtu)
1972{
1973        int res;
1974
1975        spin_lock_bh(&x->lock);
1976        if (x->km.state == XFRM_STATE_VALID &&
1977            x->type && x->type->get_mtu)
1978                res = x->type->get_mtu(x, mtu);
1979        else
1980                res = mtu - x->props.header_len;
1981        spin_unlock_bh(&x->lock);
1982        return res;
1983}
1984
1985int __xfrm_init_state(struct xfrm_state *x, bool init_replay)
1986{
1987        struct xfrm_state_afinfo *afinfo;
1988        struct xfrm_mode *inner_mode;
1989        int family = x->props.family;
1990        int err;
1991
1992        err = -EAFNOSUPPORT;
1993        afinfo = xfrm_state_get_afinfo(family);
1994        if (!afinfo)
1995                goto error;
1996
1997        err = 0;
1998        if (afinfo->init_flags)
1999                err = afinfo->init_flags(x);
2000
2001        xfrm_state_put_afinfo(afinfo);
2002
2003        if (err)
2004                goto error;
2005
2006        err = -EPROTONOSUPPORT;
2007
2008        if (x->sel.family != AF_UNSPEC) {
2009                inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
2010                if (inner_mode == NULL)
2011                        goto error;
2012
2013                if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
2014                    family != x->sel.family) {
2015                        xfrm_put_mode(inner_mode);
2016                        goto error;
2017                }
2018
2019                x->inner_mode = inner_mode;
2020        } else {
2021                struct xfrm_mode *inner_mode_iaf;
2022                int iafamily = AF_INET;
2023
2024                inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
2025                if (inner_mode == NULL)
2026                        goto error;
2027
2028                if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) {
2029                        xfrm_put_mode(inner_mode);
2030                        goto error;
2031                }
2032                x->inner_mode = inner_mode;
2033
2034                if (x->props.family == AF_INET)
2035                        iafamily = AF_INET6;
2036
2037                inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
2038                if (inner_mode_iaf) {
2039                        if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
2040                                x->inner_mode_iaf = inner_mode_iaf;
2041                        else
2042                                xfrm_put_mode(inner_mode_iaf);
2043                }
2044        }
2045
2046        x->type = xfrm_get_type(x->id.proto, family);
2047        if (x->type == NULL)
2048                goto error;
2049
2050        err = x->type->init_state(x);
2051        if (err)
2052                goto error;
2053
2054        x->outer_mode = xfrm_get_mode(x->props.mode, family);
2055        if (x->outer_mode == NULL) {
2056                err = -EPROTONOSUPPORT;
2057                goto error;
2058        }
2059
2060        if (init_replay) {
2061                err = xfrm_init_replay(x);
2062                if (err)
2063                        goto error;
2064        }
2065
2066        x->km.state = XFRM_STATE_VALID;
2067
2068error:
2069        return err;
2070}
2071
2072EXPORT_SYMBOL(__xfrm_init_state);
2073
2074int xfrm_init_state(struct xfrm_state *x)
2075{
2076        return __xfrm_init_state(x, true);
2077}
2078
2079EXPORT_SYMBOL(xfrm_init_state);
2080
2081int __net_init xfrm_state_init(struct net *net)
2082{
2083        unsigned int sz;
2084
2085        INIT_LIST_HEAD(&net->xfrm.state_all);
2086
2087        sz = sizeof(struct hlist_head) * 8;
2088
2089        net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2090        if (!net->xfrm.state_bydst)
2091                goto out_bydst;
2092        net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2093        if (!net->xfrm.state_bysrc)
2094                goto out_bysrc;
2095        net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2096        if (!net->xfrm.state_byspi)
2097                goto out_byspi;
2098        net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2099
2100        net->xfrm.state_num = 0;
2101        INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2102        INIT_HLIST_HEAD(&net->xfrm.state_gc_list);
2103        INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task);
2104        spin_lock_init(&net->xfrm.xfrm_state_lock);
2105        return 0;
2106
2107out_byspi:
2108        xfrm_hash_free(net->xfrm.state_bysrc, sz);
2109out_bysrc:
2110        xfrm_hash_free(net->xfrm.state_bydst, sz);
2111out_bydst:
2112        return -ENOMEM;
2113}
2114
2115void xfrm_state_fini(struct net *net)
2116{
2117        unsigned int sz;
2118
2119        flush_work(&net->xfrm.state_hash_work);
2120        xfrm_state_flush(net, IPSEC_PROTO_ANY, false);
2121        flush_work(&net->xfrm.state_gc_work);
2122
2123        WARN_ON(!list_empty(&net->xfrm.state_all));
2124
2125        sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2126        WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2127        xfrm_hash_free(net->xfrm.state_byspi, sz);
2128        WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2129        xfrm_hash_free(net->xfrm.state_bysrc, sz);
2130        WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2131        xfrm_hash_free(net->xfrm.state_bydst, sz);
2132}
2133
2134#ifdef CONFIG_AUDITSYSCALL
2135static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2136                                     struct audit_buffer *audit_buf)
2137{
2138        struct xfrm_sec_ctx *ctx = x->security;
2139        u32 spi = ntohl(x->id.spi);
2140
2141        if (ctx)
2142                audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2143                                 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2144
2145        switch (x->props.family) {
2146        case AF_INET:
2147                audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2148                                 &x->props.saddr.a4, &x->id.daddr.a4);
2149                break;
2150        case AF_INET6:
2151                audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2152                                 x->props.saddr.a6, x->id.daddr.a6);
2153                break;
2154        }
2155
2156        audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2157}
2158
2159static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2160                                      struct audit_buffer *audit_buf)
2161{
2162        const struct iphdr *iph4;
2163        const struct ipv6hdr *iph6;
2164
2165        switch (family) {
2166        case AF_INET:
2167                iph4 = ip_hdr(skb);
2168                audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2169                                 &iph4->saddr, &iph4->daddr);
2170                break;
2171        case AF_INET6:
2172                iph6 = ipv6_hdr(skb);
2173                audit_log_format(audit_buf,
2174                                 " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2175                                 &iph6->saddr, &iph6->daddr,
2176                                 iph6->flow_lbl[0] & 0x0f,
2177                                 iph6->flow_lbl[1],
2178                                 iph6->flow_lbl[2]);
2179                break;
2180        }
2181}
2182
2183void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid)
2184{
2185        struct audit_buffer *audit_buf;
2186
2187        audit_buf = xfrm_audit_start("SAD-add");
2188        if (audit_buf == NULL)
2189                return;
2190        xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2191        xfrm_audit_helper_sainfo(x, audit_buf);
2192        audit_log_format(audit_buf, " res=%u", result);
2193        audit_log_end(audit_buf);
2194}
2195EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2196
2197void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid)
2198{
2199        struct audit_buffer *audit_buf;
2200
2201        audit_buf = xfrm_audit_start("SAD-delete");
2202        if (audit_buf == NULL)
2203                return;
2204        xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2205        xfrm_audit_helper_sainfo(x, audit_buf);
2206        audit_log_format(audit_buf, " res=%u", result);
2207        audit_log_end(audit_buf);
2208}
2209EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
2210
2211void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
2212                                      struct sk_buff *skb)
2213{
2214        struct audit_buffer *audit_buf;
2215        u32 spi;
2216
2217        audit_buf = xfrm_audit_start("SA-replay-overflow");
2218        if (audit_buf == NULL)
2219                return;
2220        xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2221        /* don't record the sequence number because it's inherent in this kind
2222         * of audit message */
2223        spi = ntohl(x->id.spi);
2224        audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2225        audit_log_end(audit_buf);
2226}
2227EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
2228
2229void xfrm_audit_state_replay(struct xfrm_state *x,
2230                             struct sk_buff *skb, __be32 net_seq)
2231{
2232        struct audit_buffer *audit_buf;
2233        u32 spi;
2234
2235        audit_buf = xfrm_audit_start("SA-replayed-pkt");
2236        if (audit_buf == NULL)
2237                return;
2238        xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2239        spi = ntohl(x->id.spi);
2240        audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2241                         spi, spi, ntohl(net_seq));
2242        audit_log_end(audit_buf);
2243}
2244EXPORT_SYMBOL_GPL(xfrm_audit_state_replay);
2245
2246void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
2247{
2248        struct audit_buffer *audit_buf;
2249
2250        audit_buf = xfrm_audit_start("SA-notfound");
2251        if (audit_buf == NULL)
2252                return;
2253        xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2254        audit_log_end(audit_buf);
2255}
2256EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
2257
2258void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
2259                               __be32 net_spi, __be32 net_seq)
2260{
2261        struct audit_buffer *audit_buf;
2262        u32 spi;
2263
2264        audit_buf = xfrm_audit_start("SA-notfound");
2265        if (audit_buf == NULL)
2266                return;
2267        xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2268        spi = ntohl(net_spi);
2269        audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2270                         spi, spi, ntohl(net_seq));
2271        audit_log_end(audit_buf);
2272}
2273EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
2274
2275void xfrm_audit_state_icvfail(struct xfrm_state *x,
2276                              struct sk_buff *skb, u8 proto)
2277{
2278        struct audit_buffer *audit_buf;
2279        __be32 net_spi;
2280        __be32 net_seq;
2281
2282        audit_buf = xfrm_audit_start("SA-icv-failure");
2283        if (audit_buf == NULL)
2284                return;
2285        xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2286        if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
2287                u32 spi = ntohl(net_spi);
2288                audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2289                                 spi, spi, ntohl(net_seq));
2290        }
2291        audit_log_end(audit_buf);
2292}
2293EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
2294#endif /* CONFIG_AUDITSYSCALL */
2295