linux/net/xfrm/xfrm_user.c
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   1/* xfrm_user.c: User interface to configure xfrm engine.
   2 *
   3 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
   4 *
   5 * Changes:
   6 *      Mitsuru KANDA @USAGI
   7 *      Kazunori MIYAZAWA @USAGI
   8 *      Kunihiro Ishiguro <kunihiro@ipinfusion.com>
   9 *              IPv6 support
  10 *
  11 */
  12
  13#include <linux/crypto.h>
  14#include <linux/module.h>
  15#include <linux/kernel.h>
  16#include <linux/types.h>
  17#include <linux/slab.h>
  18#include <linux/socket.h>
  19#include <linux/string.h>
  20#include <linux/net.h>
  21#include <linux/skbuff.h>
  22#include <linux/pfkeyv2.h>
  23#include <linux/ipsec.h>
  24#include <linux/init.h>
  25#include <linux/security.h>
  26#include <net/sock.h>
  27#include <net/xfrm.h>
  28#include <net/netlink.h>
  29#include <net/ah.h>
  30#include <asm/uaccess.h>
  31#if IS_ENABLED(CONFIG_IPV6)
  32#include <linux/in6.h>
  33#endif
  34
  35static inline int aead_len(struct xfrm_algo_aead *alg)
  36{
  37        return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
  38}
  39
  40static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
  41{
  42        struct nlattr *rt = attrs[type];
  43        struct xfrm_algo *algp;
  44
  45        if (!rt)
  46                return 0;
  47
  48        algp = nla_data(rt);
  49        if (nla_len(rt) < xfrm_alg_len(algp))
  50                return -EINVAL;
  51
  52        switch (type) {
  53        case XFRMA_ALG_AUTH:
  54        case XFRMA_ALG_CRYPT:
  55        case XFRMA_ALG_COMP:
  56                break;
  57
  58        default:
  59                return -EINVAL;
  60        }
  61
  62        algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
  63        return 0;
  64}
  65
  66static int verify_auth_trunc(struct nlattr **attrs)
  67{
  68        struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
  69        struct xfrm_algo_auth *algp;
  70
  71        if (!rt)
  72                return 0;
  73
  74        algp = nla_data(rt);
  75        if (nla_len(rt) < xfrm_alg_auth_len(algp))
  76                return -EINVAL;
  77
  78        algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
  79        return 0;
  80}
  81
  82static int verify_aead(struct nlattr **attrs)
  83{
  84        struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
  85        struct xfrm_algo_aead *algp;
  86
  87        if (!rt)
  88                return 0;
  89
  90        algp = nla_data(rt);
  91        if (nla_len(rt) < aead_len(algp))
  92                return -EINVAL;
  93
  94        algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
  95        return 0;
  96}
  97
  98static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
  99                           xfrm_address_t **addrp)
 100{
 101        struct nlattr *rt = attrs[type];
 102
 103        if (rt && addrp)
 104                *addrp = nla_data(rt);
 105}
 106
 107static inline int verify_sec_ctx_len(struct nlattr **attrs)
 108{
 109        struct nlattr *rt = attrs[XFRMA_SEC_CTX];
 110        struct xfrm_user_sec_ctx *uctx;
 111
 112        if (!rt)
 113                return 0;
 114
 115        uctx = nla_data(rt);
 116        if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
 117                return -EINVAL;
 118
 119        return 0;
 120}
 121
 122static inline int verify_replay(struct xfrm_usersa_info *p,
 123                                struct nlattr **attrs)
 124{
 125        struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
 126        struct xfrm_replay_state_esn *rs;
 127
 128        if (p->flags & XFRM_STATE_ESN) {
 129                if (!rt)
 130                        return -EINVAL;
 131
 132                rs = nla_data(rt);
 133
 134                if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
 135                        return -EINVAL;
 136
 137                if (nla_len(rt) < xfrm_replay_state_esn_len(rs) &&
 138                    nla_len(rt) != sizeof(*rs))
 139                        return -EINVAL;
 140        }
 141
 142        if (!rt)
 143                return 0;
 144
 145        if (p->id.proto != IPPROTO_ESP)
 146                return -EINVAL;
 147
 148        if (p->replay_window != 0)
 149                return -EINVAL;
 150
 151        return 0;
 152}
 153
 154static int verify_newsa_info(struct xfrm_usersa_info *p,
 155                             struct nlattr **attrs)
 156{
 157        int err;
 158
 159        err = -EINVAL;
 160        switch (p->family) {
 161        case AF_INET:
 162                break;
 163
 164        case AF_INET6:
 165#if IS_ENABLED(CONFIG_IPV6)
 166                break;
 167#else
 168                err = -EAFNOSUPPORT;
 169                goto out;
 170#endif
 171
 172        default:
 173                goto out;
 174        }
 175
 176        err = -EINVAL;
 177        switch (p->id.proto) {
 178        case IPPROTO_AH:
 179                if ((!attrs[XFRMA_ALG_AUTH]     &&
 180                     !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
 181                    attrs[XFRMA_ALG_AEAD]       ||
 182                    attrs[XFRMA_ALG_CRYPT]      ||
 183                    attrs[XFRMA_ALG_COMP]       ||
 184                    attrs[XFRMA_TFCPAD])
 185                        goto out;
 186                break;
 187
 188        case IPPROTO_ESP:
 189                if (attrs[XFRMA_ALG_COMP])
 190                        goto out;
 191                if (!attrs[XFRMA_ALG_AUTH] &&
 192                    !attrs[XFRMA_ALG_AUTH_TRUNC] &&
 193                    !attrs[XFRMA_ALG_CRYPT] &&
 194                    !attrs[XFRMA_ALG_AEAD])
 195                        goto out;
 196                if ((attrs[XFRMA_ALG_AUTH] ||
 197                     attrs[XFRMA_ALG_AUTH_TRUNC] ||
 198                     attrs[XFRMA_ALG_CRYPT]) &&
 199                    attrs[XFRMA_ALG_AEAD])
 200                        goto out;
 201                if (attrs[XFRMA_TFCPAD] &&
 202                    p->mode != XFRM_MODE_TUNNEL)
 203                        goto out;
 204                break;
 205
 206        case IPPROTO_COMP:
 207                if (!attrs[XFRMA_ALG_COMP]      ||
 208                    attrs[XFRMA_ALG_AEAD]       ||
 209                    attrs[XFRMA_ALG_AUTH]       ||
 210                    attrs[XFRMA_ALG_AUTH_TRUNC] ||
 211                    attrs[XFRMA_ALG_CRYPT]      ||
 212                    attrs[XFRMA_TFCPAD])
 213                        goto out;
 214                break;
 215
 216#if IS_ENABLED(CONFIG_IPV6)
 217        case IPPROTO_DSTOPTS:
 218        case IPPROTO_ROUTING:
 219                if (attrs[XFRMA_ALG_COMP]       ||
 220                    attrs[XFRMA_ALG_AUTH]       ||
 221                    attrs[XFRMA_ALG_AUTH_TRUNC] ||
 222                    attrs[XFRMA_ALG_AEAD]       ||
 223                    attrs[XFRMA_ALG_CRYPT]      ||
 224                    attrs[XFRMA_ENCAP]          ||
 225                    attrs[XFRMA_SEC_CTX]        ||
 226                    attrs[XFRMA_TFCPAD]         ||
 227                    !attrs[XFRMA_COADDR])
 228                        goto out;
 229                break;
 230#endif
 231
 232        default:
 233                goto out;
 234        }
 235
 236        if ((err = verify_aead(attrs)))
 237                goto out;
 238        if ((err = verify_auth_trunc(attrs)))
 239                goto out;
 240        if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
 241                goto out;
 242        if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
 243                goto out;
 244        if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
 245                goto out;
 246        if ((err = verify_sec_ctx_len(attrs)))
 247                goto out;
 248        if ((err = verify_replay(p, attrs)))
 249                goto out;
 250
 251        err = -EINVAL;
 252        switch (p->mode) {
 253        case XFRM_MODE_TRANSPORT:
 254        case XFRM_MODE_TUNNEL:
 255        case XFRM_MODE_ROUTEOPTIMIZATION:
 256        case XFRM_MODE_BEET:
 257                break;
 258
 259        default:
 260                goto out;
 261        }
 262
 263        err = 0;
 264
 265out:
 266        return err;
 267}
 268
 269static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
 270                           struct xfrm_algo_desc *(*get_byname)(const char *, int),
 271                           struct nlattr *rta)
 272{
 273        struct xfrm_algo *p, *ualg;
 274        struct xfrm_algo_desc *algo;
 275
 276        if (!rta)
 277                return 0;
 278
 279        ualg = nla_data(rta);
 280
 281        algo = get_byname(ualg->alg_name, 1);
 282        if (!algo)
 283                return -ENOSYS;
 284        *props = algo->desc.sadb_alg_id;
 285
 286        p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
 287        if (!p)
 288                return -ENOMEM;
 289
 290        strcpy(p->alg_name, algo->name);
 291        *algpp = p;
 292        return 0;
 293}
 294
 295static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
 296                       struct nlattr *rta)
 297{
 298        struct xfrm_algo *ualg;
 299        struct xfrm_algo_auth *p;
 300        struct xfrm_algo_desc *algo;
 301
 302        if (!rta)
 303                return 0;
 304
 305        ualg = nla_data(rta);
 306
 307        algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
 308        if (!algo)
 309                return -ENOSYS;
 310        *props = algo->desc.sadb_alg_id;
 311
 312        p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
 313        if (!p)
 314                return -ENOMEM;
 315
 316        strcpy(p->alg_name, algo->name);
 317        p->alg_key_len = ualg->alg_key_len;
 318        p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
 319        memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
 320
 321        *algpp = p;
 322        return 0;
 323}
 324
 325static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
 326                             struct nlattr *rta)
 327{
 328        struct xfrm_algo_auth *p, *ualg;
 329        struct xfrm_algo_desc *algo;
 330
 331        if (!rta)
 332                return 0;
 333
 334        ualg = nla_data(rta);
 335
 336        algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
 337        if (!algo)
 338                return -ENOSYS;
 339        if ((ualg->alg_trunc_len / 8) > MAX_AH_AUTH_LEN ||
 340            ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
 341                return -EINVAL;
 342        *props = algo->desc.sadb_alg_id;
 343
 344        p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
 345        if (!p)
 346                return -ENOMEM;
 347
 348        strcpy(p->alg_name, algo->name);
 349        if (!p->alg_trunc_len)
 350                p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
 351
 352        *algpp = p;
 353        return 0;
 354}
 355
 356static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
 357                       struct nlattr *rta)
 358{
 359        struct xfrm_algo_aead *p, *ualg;
 360        struct xfrm_algo_desc *algo;
 361
 362        if (!rta)
 363                return 0;
 364
 365        ualg = nla_data(rta);
 366
 367        algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
 368        if (!algo)
 369                return -ENOSYS;
 370        *props = algo->desc.sadb_alg_id;
 371
 372        p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
 373        if (!p)
 374                return -ENOMEM;
 375
 376        strcpy(p->alg_name, algo->name);
 377        *algpp = p;
 378        return 0;
 379}
 380
 381static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
 382                                         struct nlattr *rp)
 383{
 384        struct xfrm_replay_state_esn *up;
 385        int ulen;
 386
 387        if (!replay_esn || !rp)
 388                return 0;
 389
 390        up = nla_data(rp);
 391        ulen = xfrm_replay_state_esn_len(up);
 392
 393        if (nla_len(rp) < ulen || xfrm_replay_state_esn_len(replay_esn) != ulen)
 394                return -EINVAL;
 395
 396        return 0;
 397}
 398
 399static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
 400                                       struct xfrm_replay_state_esn **preplay_esn,
 401                                       struct nlattr *rta)
 402{
 403        struct xfrm_replay_state_esn *p, *pp, *up;
 404        int klen, ulen;
 405
 406        if (!rta)
 407                return 0;
 408
 409        up = nla_data(rta);
 410        klen = xfrm_replay_state_esn_len(up);
 411        ulen = nla_len(rta) >= klen ? klen : sizeof(*up);
 412
 413        p = kzalloc(klen, GFP_KERNEL);
 414        if (!p)
 415                return -ENOMEM;
 416
 417        pp = kzalloc(klen, GFP_KERNEL);
 418        if (!pp) {
 419                kfree(p);
 420                return -ENOMEM;
 421        }
 422
 423        memcpy(p, up, ulen);
 424        memcpy(pp, up, ulen);
 425
 426        *replay_esn = p;
 427        *preplay_esn = pp;
 428
 429        return 0;
 430}
 431
 432static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
 433{
 434        int len = 0;
 435
 436        if (xfrm_ctx) {
 437                len += sizeof(struct xfrm_user_sec_ctx);
 438                len += xfrm_ctx->ctx_len;
 439        }
 440        return len;
 441}
 442
 443static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
 444{
 445        memcpy(&x->id, &p->id, sizeof(x->id));
 446        memcpy(&x->sel, &p->sel, sizeof(x->sel));
 447        memcpy(&x->lft, &p->lft, sizeof(x->lft));
 448        x->props.mode = p->mode;
 449        x->props.replay_window = p->replay_window;
 450        x->props.reqid = p->reqid;
 451        x->props.family = p->family;
 452        memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
 453        x->props.flags = p->flags;
 454
 455        if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
 456                x->sel.family = p->family;
 457}
 458
 459/*
 460 * someday when pfkey also has support, we could have the code
 461 * somehow made shareable and move it to xfrm_state.c - JHS
 462 *
 463*/
 464static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
 465                                  int update_esn)
 466{
 467        struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
 468        struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
 469        struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
 470        struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
 471        struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
 472
 473        if (re) {
 474                struct xfrm_replay_state_esn *replay_esn;
 475                replay_esn = nla_data(re);
 476                memcpy(x->replay_esn, replay_esn,
 477                       xfrm_replay_state_esn_len(replay_esn));
 478                memcpy(x->preplay_esn, replay_esn,
 479                       xfrm_replay_state_esn_len(replay_esn));
 480        }
 481
 482        if (rp) {
 483                struct xfrm_replay_state *replay;
 484                replay = nla_data(rp);
 485                memcpy(&x->replay, replay, sizeof(*replay));
 486                memcpy(&x->preplay, replay, sizeof(*replay));
 487        }
 488
 489        if (lt) {
 490                struct xfrm_lifetime_cur *ltime;
 491                ltime = nla_data(lt);
 492                x->curlft.bytes = ltime->bytes;
 493                x->curlft.packets = ltime->packets;
 494                x->curlft.add_time = ltime->add_time;
 495                x->curlft.use_time = ltime->use_time;
 496        }
 497
 498        if (et)
 499                x->replay_maxage = nla_get_u32(et);
 500
 501        if (rt)
 502                x->replay_maxdiff = nla_get_u32(rt);
 503}
 504
 505static struct xfrm_state *xfrm_state_construct(struct net *net,
 506                                               struct xfrm_usersa_info *p,
 507                                               struct nlattr **attrs,
 508                                               int *errp)
 509{
 510        struct xfrm_state *x = xfrm_state_alloc(net);
 511        int err = -ENOMEM;
 512
 513        if (!x)
 514                goto error_no_put;
 515
 516        copy_from_user_state(x, p);
 517
 518        if ((err = attach_aead(&x->aead, &x->props.ealgo,
 519                               attrs[XFRMA_ALG_AEAD])))
 520                goto error;
 521        if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
 522                                     attrs[XFRMA_ALG_AUTH_TRUNC])))
 523                goto error;
 524        if (!x->props.aalgo) {
 525                if ((err = attach_auth(&x->aalg, &x->props.aalgo,
 526                                       attrs[XFRMA_ALG_AUTH])))
 527                        goto error;
 528        }
 529        if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
 530                                   xfrm_ealg_get_byname,
 531                                   attrs[XFRMA_ALG_CRYPT])))
 532                goto error;
 533        if ((err = attach_one_algo(&x->calg, &x->props.calgo,
 534                                   xfrm_calg_get_byname,
 535                                   attrs[XFRMA_ALG_COMP])))
 536                goto error;
 537
 538        if (attrs[XFRMA_ENCAP]) {
 539                x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
 540                                   sizeof(*x->encap), GFP_KERNEL);
 541                if (x->encap == NULL)
 542                        goto error;
 543        }
 544
 545        if (attrs[XFRMA_TFCPAD])
 546                x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
 547
 548        if (attrs[XFRMA_COADDR]) {
 549                x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
 550                                    sizeof(*x->coaddr), GFP_KERNEL);
 551                if (x->coaddr == NULL)
 552                        goto error;
 553        }
 554
 555        xfrm_mark_get(attrs, &x->mark);
 556
 557        err = __xfrm_init_state(x, false);
 558        if (err)
 559                goto error;
 560
 561        if (attrs[XFRMA_SEC_CTX] &&
 562            security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
 563                goto error;
 564
 565        if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
 566                                               attrs[XFRMA_REPLAY_ESN_VAL])))
 567                goto error;
 568
 569        x->km.seq = p->seq;
 570        x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
 571        /* sysctl_xfrm_aevent_etime is in 100ms units */
 572        x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
 573
 574        if ((err = xfrm_init_replay(x)))
 575                goto error;
 576
 577        /* override default values from above */
 578        xfrm_update_ae_params(x, attrs, 0);
 579
 580        return x;
 581
 582error:
 583        x->km.state = XFRM_STATE_DEAD;
 584        xfrm_state_put(x);
 585error_no_put:
 586        *errp = err;
 587        return NULL;
 588}
 589
 590static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
 591                struct nlattr **attrs)
 592{
 593        struct net *net = sock_net(skb->sk);
 594        struct xfrm_usersa_info *p = nlmsg_data(nlh);
 595        struct xfrm_state *x;
 596        int err;
 597        struct km_event c;
 598        uid_t loginuid = audit_get_loginuid(current);
 599        u32 sessionid = audit_get_sessionid(current);
 600        u32 sid;
 601
 602        err = verify_newsa_info(p, attrs);
 603        if (err)
 604                return err;
 605
 606        x = xfrm_state_construct(net, p, attrs, &err);
 607        if (!x)
 608                return err;
 609
 610        xfrm_state_hold(x);
 611        if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
 612                err = xfrm_state_add(x);
 613        else
 614                err = xfrm_state_update(x);
 615
 616        security_task_getsecid(current, &sid);
 617        xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid);
 618
 619        if (err < 0) {
 620                x->km.state = XFRM_STATE_DEAD;
 621                __xfrm_state_put(x);
 622                goto out;
 623        }
 624
 625        c.seq = nlh->nlmsg_seq;
 626        c.pid = nlh->nlmsg_pid;
 627        c.event = nlh->nlmsg_type;
 628
 629        km_state_notify(x, &c);
 630out:
 631        xfrm_state_put(x);
 632        return err;
 633}
 634
 635static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
 636                                                 struct xfrm_usersa_id *p,
 637                                                 struct nlattr **attrs,
 638                                                 int *errp)
 639{
 640        struct xfrm_state *x = NULL;
 641        struct xfrm_mark m;
 642        int err;
 643        u32 mark = xfrm_mark_get(attrs, &m);
 644
 645        if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
 646                err = -ESRCH;
 647                x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
 648        } else {
 649                xfrm_address_t *saddr = NULL;
 650
 651                verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
 652                if (!saddr) {
 653                        err = -EINVAL;
 654                        goto out;
 655                }
 656
 657                err = -ESRCH;
 658                x = xfrm_state_lookup_byaddr(net, mark,
 659                                             &p->daddr, saddr,
 660                                             p->proto, p->family);
 661        }
 662
 663 out:
 664        if (!x && errp)
 665                *errp = err;
 666        return x;
 667}
 668
 669static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
 670                struct nlattr **attrs)
 671{
 672        struct net *net = sock_net(skb->sk);
 673        struct xfrm_state *x;
 674        int err = -ESRCH;
 675        struct km_event c;
 676        struct xfrm_usersa_id *p = nlmsg_data(nlh);
 677        uid_t loginuid = audit_get_loginuid(current);
 678        u32 sessionid = audit_get_sessionid(current);
 679        u32 sid;
 680
 681        x = xfrm_user_state_lookup(net, p, attrs, &err);
 682        if (x == NULL)
 683                return err;
 684
 685        if ((err = security_xfrm_state_delete(x)) != 0)
 686                goto out;
 687
 688        if (xfrm_state_kern(x)) {
 689                err = -EPERM;
 690                goto out;
 691        }
 692
 693        err = xfrm_state_delete(x);
 694
 695        if (err < 0)
 696                goto out;
 697
 698        c.seq = nlh->nlmsg_seq;
 699        c.pid = nlh->nlmsg_pid;
 700        c.event = nlh->nlmsg_type;
 701        km_state_notify(x, &c);
 702
 703out:
 704        security_task_getsecid(current, &sid);
 705        xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid);
 706        xfrm_state_put(x);
 707        return err;
 708}
 709
 710static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
 711{
 712        memset(p, 0, sizeof(*p));
 713        memcpy(&p->id, &x->id, sizeof(p->id));
 714        memcpy(&p->sel, &x->sel, sizeof(p->sel));
 715        memcpy(&p->lft, &x->lft, sizeof(p->lft));
 716        memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
 717        memcpy(&p->stats, &x->stats, sizeof(p->stats));
 718        memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
 719        p->mode = x->props.mode;
 720        p->replay_window = x->props.replay_window;
 721        p->reqid = x->props.reqid;
 722        p->family = x->props.family;
 723        p->flags = x->props.flags;
 724        p->seq = x->km.seq;
 725}
 726
 727struct xfrm_dump_info {
 728        struct sk_buff *in_skb;
 729        struct sk_buff *out_skb;
 730        u32 nlmsg_seq;
 731        u16 nlmsg_flags;
 732};
 733
 734static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
 735{
 736        struct xfrm_user_sec_ctx *uctx;
 737        struct nlattr *attr;
 738        int ctx_size = sizeof(*uctx) + s->ctx_len;
 739
 740        attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
 741        if (attr == NULL)
 742                return -EMSGSIZE;
 743
 744        uctx = nla_data(attr);
 745        uctx->exttype = XFRMA_SEC_CTX;
 746        uctx->len = ctx_size;
 747        uctx->ctx_doi = s->ctx_doi;
 748        uctx->ctx_alg = s->ctx_alg;
 749        uctx->ctx_len = s->ctx_len;
 750        memcpy(uctx + 1, s->ctx_str, s->ctx_len);
 751
 752        return 0;
 753}
 754
 755static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
 756{
 757        struct xfrm_algo *algo;
 758        struct nlattr *nla;
 759
 760        nla = nla_reserve(skb, XFRMA_ALG_AUTH,
 761                          sizeof(*algo) + (auth->alg_key_len + 7) / 8);
 762        if (!nla)
 763                return -EMSGSIZE;
 764
 765        algo = nla_data(nla);
 766        strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
 767        memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
 768        algo->alg_key_len = auth->alg_key_len;
 769
 770        return 0;
 771}
 772
 773/* Don't change this without updating xfrm_sa_len! */
 774static int copy_to_user_state_extra(struct xfrm_state *x,
 775                                    struct xfrm_usersa_info *p,
 776                                    struct sk_buff *skb)
 777{
 778        int ret = 0;
 779
 780        copy_to_user_state(x, p);
 781
 782        if (x->coaddr) {
 783                ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
 784                if (ret)
 785                        goto out;
 786        }
 787        if (x->lastused) {
 788                ret = nla_put_u64(skb, XFRMA_LASTUSED, x->lastused);
 789                if (ret)
 790                        goto out;
 791        }
 792        if (x->aead) {
 793                ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
 794                if (ret)
 795                        goto out;
 796        }
 797        if (x->aalg) {
 798                ret = copy_to_user_auth(x->aalg, skb);
 799                if (!ret)
 800                        ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
 801                                      xfrm_alg_auth_len(x->aalg), x->aalg);
 802                if (ret)
 803                        goto out;
 804        }
 805        if (x->ealg) {
 806                ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
 807                if (ret)
 808                        goto out;
 809        }
 810        if (x->calg) {
 811                ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
 812                if (ret)
 813                        goto out;
 814        }
 815        if (x->encap) {
 816                ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
 817                if (ret)
 818                        goto out;
 819        }
 820        if (x->tfcpad) {
 821                ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
 822                if (ret)
 823                        goto out;
 824        }
 825        ret = xfrm_mark_put(skb, &x->mark);
 826        if (ret)
 827                goto out;
 828        if (x->replay_esn) {
 829                ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
 830                              xfrm_replay_state_esn_len(x->replay_esn),
 831                              x->replay_esn);
 832                if (ret)
 833                        goto out;
 834        }
 835        if (x->security)
 836                ret = copy_sec_ctx(x->security, skb);
 837out:
 838        return ret;
 839}
 840
 841static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
 842{
 843        struct xfrm_dump_info *sp = ptr;
 844        struct sk_buff *in_skb = sp->in_skb;
 845        struct sk_buff *skb = sp->out_skb;
 846        struct xfrm_usersa_info *p;
 847        struct nlmsghdr *nlh;
 848        int err;
 849
 850        nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
 851                        XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
 852        if (nlh == NULL)
 853                return -EMSGSIZE;
 854
 855        p = nlmsg_data(nlh);
 856
 857        err = copy_to_user_state_extra(x, p, skb);
 858        if (err) {
 859                nlmsg_cancel(skb, nlh);
 860                return err;
 861        }
 862        nlmsg_end(skb, nlh);
 863        return 0;
 864}
 865
 866static int xfrm_dump_sa_done(struct netlink_callback *cb)
 867{
 868        struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
 869        xfrm_state_walk_done(walk);
 870        return 0;
 871}
 872
 873static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
 874{
 875        struct net *net = sock_net(skb->sk);
 876        struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
 877        struct xfrm_dump_info info;
 878
 879        BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
 880                     sizeof(cb->args) - sizeof(cb->args[0]));
 881
 882        info.in_skb = cb->skb;
 883        info.out_skb = skb;
 884        info.nlmsg_seq = cb->nlh->nlmsg_seq;
 885        info.nlmsg_flags = NLM_F_MULTI;
 886
 887        if (!cb->args[0]) {
 888                cb->args[0] = 1;
 889                xfrm_state_walk_init(walk, 0);
 890        }
 891
 892        (void) xfrm_state_walk(net, walk, dump_one_state, &info);
 893
 894        return skb->len;
 895}
 896
 897static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
 898                                          struct xfrm_state *x, u32 seq)
 899{
 900        struct xfrm_dump_info info;
 901        struct sk_buff *skb;
 902        int err;
 903
 904        skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
 905        if (!skb)
 906                return ERR_PTR(-ENOMEM);
 907
 908        info.in_skb = in_skb;
 909        info.out_skb = skb;
 910        info.nlmsg_seq = seq;
 911        info.nlmsg_flags = 0;
 912
 913        err = dump_one_state(x, 0, &info);
 914        if (err) {
 915                kfree_skb(skb);
 916                return ERR_PTR(err);
 917        }
 918
 919        return skb;
 920}
 921
 922static inline size_t xfrm_spdinfo_msgsize(void)
 923{
 924        return NLMSG_ALIGN(4)
 925               + nla_total_size(sizeof(struct xfrmu_spdinfo))
 926               + nla_total_size(sizeof(struct xfrmu_spdhinfo));
 927}
 928
 929static int build_spdinfo(struct sk_buff *skb, struct net *net,
 930                         u32 pid, u32 seq, u32 flags)
 931{
 932        struct xfrmk_spdinfo si;
 933        struct xfrmu_spdinfo spc;
 934        struct xfrmu_spdhinfo sph;
 935        struct nlmsghdr *nlh;
 936        int err;
 937        u32 *f;
 938
 939        nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
 940        if (nlh == NULL) /* shouldn't really happen ... */
 941                return -EMSGSIZE;
 942
 943        f = nlmsg_data(nlh);
 944        *f = flags;
 945        xfrm_spd_getinfo(net, &si);
 946        spc.incnt = si.incnt;
 947        spc.outcnt = si.outcnt;
 948        spc.fwdcnt = si.fwdcnt;
 949        spc.inscnt = si.inscnt;
 950        spc.outscnt = si.outscnt;
 951        spc.fwdscnt = si.fwdscnt;
 952        sph.spdhcnt = si.spdhcnt;
 953        sph.spdhmcnt = si.spdhmcnt;
 954
 955        err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
 956        if (!err)
 957                err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
 958        if (err) {
 959                nlmsg_cancel(skb, nlh);
 960                return err;
 961        }
 962
 963        return nlmsg_end(skb, nlh);
 964}
 965
 966static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
 967                struct nlattr **attrs)
 968{
 969        struct net *net = sock_net(skb->sk);
 970        struct sk_buff *r_skb;
 971        u32 *flags = nlmsg_data(nlh);
 972        u32 spid = NETLINK_CB(skb).pid;
 973        u32 seq = nlh->nlmsg_seq;
 974
 975        r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
 976        if (r_skb == NULL)
 977                return -ENOMEM;
 978
 979        if (build_spdinfo(r_skb, net, spid, seq, *flags) < 0)
 980                BUG();
 981
 982        return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid);
 983}
 984
 985static inline size_t xfrm_sadinfo_msgsize(void)
 986{
 987        return NLMSG_ALIGN(4)
 988               + nla_total_size(sizeof(struct xfrmu_sadhinfo))
 989               + nla_total_size(4); /* XFRMA_SAD_CNT */
 990}
 991
 992static int build_sadinfo(struct sk_buff *skb, struct net *net,
 993                         u32 pid, u32 seq, u32 flags)
 994{
 995        struct xfrmk_sadinfo si;
 996        struct xfrmu_sadhinfo sh;
 997        struct nlmsghdr *nlh;
 998        int err;
 999        u32 *f;
1000
1001        nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1002        if (nlh == NULL) /* shouldn't really happen ... */
1003                return -EMSGSIZE;
1004
1005        f = nlmsg_data(nlh);
1006        *f = flags;
1007        xfrm_sad_getinfo(net, &si);
1008
1009        sh.sadhmcnt = si.sadhmcnt;
1010        sh.sadhcnt = si.sadhcnt;
1011
1012        err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1013        if (!err)
1014                err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1015        if (err) {
1016                nlmsg_cancel(skb, nlh);
1017                return err;
1018        }
1019
1020        return nlmsg_end(skb, nlh);
1021}
1022
1023static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1024                struct nlattr **attrs)
1025{
1026        struct net *net = sock_net(skb->sk);
1027        struct sk_buff *r_skb;
1028        u32 *flags = nlmsg_data(nlh);
1029        u32 spid = NETLINK_CB(skb).pid;
1030        u32 seq = nlh->nlmsg_seq;
1031
1032        r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1033        if (r_skb == NULL)
1034                return -ENOMEM;
1035
1036        if (build_sadinfo(r_skb, net, spid, seq, *flags) < 0)
1037                BUG();
1038
1039        return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid);
1040}
1041
1042static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1043                struct nlattr **attrs)
1044{
1045        struct net *net = sock_net(skb->sk);
1046        struct xfrm_usersa_id *p = nlmsg_data(nlh);
1047        struct xfrm_state *x;
1048        struct sk_buff *resp_skb;
1049        int err = -ESRCH;
1050
1051        x = xfrm_user_state_lookup(net, p, attrs, &err);
1052        if (x == NULL)
1053                goto out_noput;
1054
1055        resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1056        if (IS_ERR(resp_skb)) {
1057                err = PTR_ERR(resp_skb);
1058        } else {
1059                err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid);
1060        }
1061        xfrm_state_put(x);
1062out_noput:
1063        return err;
1064}
1065
1066static int verify_userspi_info(struct xfrm_userspi_info *p)
1067{
1068        switch (p->info.id.proto) {
1069        case IPPROTO_AH:
1070        case IPPROTO_ESP:
1071                break;
1072
1073        case IPPROTO_COMP:
1074                /* IPCOMP spi is 16-bits. */
1075                if (p->max >= 0x10000)
1076                        return -EINVAL;
1077                break;
1078
1079        default:
1080                return -EINVAL;
1081        }
1082
1083        if (p->min > p->max)
1084                return -EINVAL;
1085
1086        return 0;
1087}
1088
1089static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1090                struct nlattr **attrs)
1091{
1092        struct net *net = sock_net(skb->sk);
1093        struct xfrm_state *x;
1094        struct xfrm_userspi_info *p;
1095        struct sk_buff *resp_skb;
1096        xfrm_address_t *daddr;
1097        int family;
1098        int err;
1099        u32 mark;
1100        struct xfrm_mark m;
1101
1102        p = nlmsg_data(nlh);
1103        err = verify_userspi_info(p);
1104        if (err)
1105                goto out_noput;
1106
1107        family = p->info.family;
1108        daddr = &p->info.id.daddr;
1109
1110        x = NULL;
1111
1112        mark = xfrm_mark_get(attrs, &m);
1113        if (p->info.seq) {
1114                x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1115                if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
1116                        xfrm_state_put(x);
1117                        x = NULL;
1118                }
1119        }
1120
1121        if (!x)
1122                x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1123                                  p->info.id.proto, daddr,
1124                                  &p->info.saddr, 1,
1125                                  family);
1126        err = -ENOENT;
1127        if (x == NULL)
1128                goto out_noput;
1129
1130        err = xfrm_alloc_spi(x, p->min, p->max);
1131        if (err)
1132                goto out;
1133
1134        resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1135        if (IS_ERR(resp_skb)) {
1136                err = PTR_ERR(resp_skb);
1137                goto out;
1138        }
1139
1140        err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid);
1141
1142out:
1143        xfrm_state_put(x);
1144out_noput:
1145        return err;
1146}
1147
1148static int verify_policy_dir(u8 dir)
1149{
1150        switch (dir) {
1151        case XFRM_POLICY_IN:
1152        case XFRM_POLICY_OUT:
1153        case XFRM_POLICY_FWD:
1154                break;
1155
1156        default:
1157                return -EINVAL;
1158        }
1159
1160        return 0;
1161}
1162
1163static int verify_policy_type(u8 type)
1164{
1165        switch (type) {
1166        case XFRM_POLICY_TYPE_MAIN:
1167#ifdef CONFIG_XFRM_SUB_POLICY
1168        case XFRM_POLICY_TYPE_SUB:
1169#endif
1170                break;
1171
1172        default:
1173                return -EINVAL;
1174        }
1175
1176        return 0;
1177}
1178
1179static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1180{
1181        switch (p->share) {
1182        case XFRM_SHARE_ANY:
1183        case XFRM_SHARE_SESSION:
1184        case XFRM_SHARE_USER:
1185        case XFRM_SHARE_UNIQUE:
1186                break;
1187
1188        default:
1189                return -EINVAL;
1190        }
1191
1192        switch (p->action) {
1193        case XFRM_POLICY_ALLOW:
1194        case XFRM_POLICY_BLOCK:
1195                break;
1196
1197        default:
1198                return -EINVAL;
1199        }
1200
1201        switch (p->sel.family) {
1202        case AF_INET:
1203                break;
1204
1205        case AF_INET6:
1206#if IS_ENABLED(CONFIG_IPV6)
1207                break;
1208#else
1209                return  -EAFNOSUPPORT;
1210#endif
1211
1212        default:
1213                return -EINVAL;
1214        }
1215
1216        return verify_policy_dir(p->dir);
1217}
1218
1219static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1220{
1221        struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1222        struct xfrm_user_sec_ctx *uctx;
1223
1224        if (!rt)
1225                return 0;
1226
1227        uctx = nla_data(rt);
1228        return security_xfrm_policy_alloc(&pol->security, uctx);
1229}
1230
1231static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1232                           int nr)
1233{
1234        int i;
1235
1236        xp->xfrm_nr = nr;
1237        for (i = 0; i < nr; i++, ut++) {
1238                struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1239
1240                memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1241                memcpy(&t->saddr, &ut->saddr,
1242                       sizeof(xfrm_address_t));
1243                t->reqid = ut->reqid;
1244                t->mode = ut->mode;
1245                t->share = ut->share;
1246                t->optional = ut->optional;
1247                t->aalgos = ut->aalgos;
1248                t->ealgos = ut->ealgos;
1249                t->calgos = ut->calgos;
1250                /* If all masks are ~0, then we allow all algorithms. */
1251                t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1252                t->encap_family = ut->family;
1253        }
1254}
1255
1256static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1257{
1258        int i;
1259
1260        if (nr > XFRM_MAX_DEPTH)
1261                return -EINVAL;
1262
1263        for (i = 0; i < nr; i++) {
1264                /* We never validated the ut->family value, so many
1265                 * applications simply leave it at zero.  The check was
1266                 * never made and ut->family was ignored because all
1267                 * templates could be assumed to have the same family as
1268                 * the policy itself.  Now that we will have ipv4-in-ipv6
1269                 * and ipv6-in-ipv4 tunnels, this is no longer true.
1270                 */
1271                if (!ut[i].family)
1272                        ut[i].family = family;
1273
1274                switch (ut[i].family) {
1275                case AF_INET:
1276                        break;
1277#if IS_ENABLED(CONFIG_IPV6)
1278                case AF_INET6:
1279                        break;
1280#endif
1281                default:
1282                        return -EINVAL;
1283                }
1284        }
1285
1286        return 0;
1287}
1288
1289static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1290{
1291        struct nlattr *rt = attrs[XFRMA_TMPL];
1292
1293        if (!rt) {
1294                pol->xfrm_nr = 0;
1295        } else {
1296                struct xfrm_user_tmpl *utmpl = nla_data(rt);
1297                int nr = nla_len(rt) / sizeof(*utmpl);
1298                int err;
1299
1300                err = validate_tmpl(nr, utmpl, pol->family);
1301                if (err)
1302                        return err;
1303
1304                copy_templates(pol, utmpl, nr);
1305        }
1306        return 0;
1307}
1308
1309static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1310{
1311        struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1312        struct xfrm_userpolicy_type *upt;
1313        u8 type = XFRM_POLICY_TYPE_MAIN;
1314        int err;
1315
1316        if (rt) {
1317                upt = nla_data(rt);
1318                type = upt->type;
1319        }
1320
1321        err = verify_policy_type(type);
1322        if (err)
1323                return err;
1324
1325        *tp = type;
1326        return 0;
1327}
1328
1329static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1330{
1331        xp->priority = p->priority;
1332        xp->index = p->index;
1333        memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1334        memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1335        xp->action = p->action;
1336        xp->flags = p->flags;
1337        xp->family = p->sel.family;
1338        /* XXX xp->share = p->share; */
1339}
1340
1341static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1342{
1343        memset(p, 0, sizeof(*p));
1344        memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1345        memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1346        memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1347        p->priority = xp->priority;
1348        p->index = xp->index;
1349        p->sel.family = xp->family;
1350        p->dir = dir;
1351        p->action = xp->action;
1352        p->flags = xp->flags;
1353        p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1354}
1355
1356static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1357{
1358        struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1359        int err;
1360
1361        if (!xp) {
1362                *errp = -ENOMEM;
1363                return NULL;
1364        }
1365
1366        copy_from_user_policy(xp, p);
1367
1368        err = copy_from_user_policy_type(&xp->type, attrs);
1369        if (err)
1370                goto error;
1371
1372        if (!(err = copy_from_user_tmpl(xp, attrs)))
1373                err = copy_from_user_sec_ctx(xp, attrs);
1374        if (err)
1375                goto error;
1376
1377        xfrm_mark_get(attrs, &xp->mark);
1378
1379        return xp;
1380 error:
1381        *errp = err;
1382        xp->walk.dead = 1;
1383        xfrm_policy_destroy(xp);
1384        return NULL;
1385}
1386
1387static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1388                struct nlattr **attrs)
1389{
1390        struct net *net = sock_net(skb->sk);
1391        struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1392        struct xfrm_policy *xp;
1393        struct km_event c;
1394        int err;
1395        int excl;
1396        uid_t loginuid = audit_get_loginuid(current);
1397        u32 sessionid = audit_get_sessionid(current);
1398        u32 sid;
1399
1400        err = verify_newpolicy_info(p);
1401        if (err)
1402                return err;
1403        err = verify_sec_ctx_len(attrs);
1404        if (err)
1405                return err;
1406
1407        xp = xfrm_policy_construct(net, p, attrs, &err);
1408        if (!xp)
1409                return err;
1410
1411        /* shouldn't excl be based on nlh flags??
1412         * Aha! this is anti-netlink really i.e  more pfkey derived
1413         * in netlink excl is a flag and you wouldnt need
1414         * a type XFRM_MSG_UPDPOLICY - JHS */
1415        excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1416        err = xfrm_policy_insert(p->dir, xp, excl);
1417        security_task_getsecid(current, &sid);
1418        xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid);
1419
1420        if (err) {
1421                security_xfrm_policy_free(xp->security);
1422                kfree(xp);
1423                return err;
1424        }
1425
1426        c.event = nlh->nlmsg_type;
1427        c.seq = nlh->nlmsg_seq;
1428        c.pid = nlh->nlmsg_pid;
1429        km_policy_notify(xp, p->dir, &c);
1430
1431        xfrm_pol_put(xp);
1432
1433        return 0;
1434}
1435
1436static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1437{
1438        struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1439        int i;
1440
1441        if (xp->xfrm_nr == 0)
1442                return 0;
1443
1444        for (i = 0; i < xp->xfrm_nr; i++) {
1445                struct xfrm_user_tmpl *up = &vec[i];
1446                struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1447
1448                memset(up, 0, sizeof(*up));
1449                memcpy(&up->id, &kp->id, sizeof(up->id));
1450                up->family = kp->encap_family;
1451                memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1452                up->reqid = kp->reqid;
1453                up->mode = kp->mode;
1454                up->share = kp->share;
1455                up->optional = kp->optional;
1456                up->aalgos = kp->aalgos;
1457                up->ealgos = kp->ealgos;
1458                up->calgos = kp->calgos;
1459        }
1460
1461        return nla_put(skb, XFRMA_TMPL,
1462                       sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1463}
1464
1465static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1466{
1467        if (x->security) {
1468                return copy_sec_ctx(x->security, skb);
1469        }
1470        return 0;
1471}
1472
1473static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1474{
1475        if (xp->security)
1476                return copy_sec_ctx(xp->security, skb);
1477        return 0;
1478}
1479static inline size_t userpolicy_type_attrsize(void)
1480{
1481#ifdef CONFIG_XFRM_SUB_POLICY
1482        return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1483#else
1484        return 0;
1485#endif
1486}
1487
1488#ifdef CONFIG_XFRM_SUB_POLICY
1489static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1490{
1491        struct xfrm_userpolicy_type upt = {
1492                .type = type,
1493        };
1494
1495        return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1496}
1497
1498#else
1499static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1500{
1501        return 0;
1502}
1503#endif
1504
1505static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1506{
1507        struct xfrm_dump_info *sp = ptr;
1508        struct xfrm_userpolicy_info *p;
1509        struct sk_buff *in_skb = sp->in_skb;
1510        struct sk_buff *skb = sp->out_skb;
1511        struct nlmsghdr *nlh;
1512        int err;
1513
1514        nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
1515                        XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1516        if (nlh == NULL)
1517                return -EMSGSIZE;
1518
1519        p = nlmsg_data(nlh);
1520        copy_to_user_policy(xp, p, dir);
1521        err = copy_to_user_tmpl(xp, skb);
1522        if (!err)
1523                err = copy_to_user_sec_ctx(xp, skb);
1524        if (!err)
1525                err = copy_to_user_policy_type(xp->type, skb);
1526        if (!err)
1527                err = xfrm_mark_put(skb, &xp->mark);
1528        if (err) {
1529                nlmsg_cancel(skb, nlh);
1530                return err;
1531        }
1532        nlmsg_end(skb, nlh);
1533        return 0;
1534}
1535
1536static int xfrm_dump_policy_done(struct netlink_callback *cb)
1537{
1538        struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1539
1540        xfrm_policy_walk_done(walk);
1541        return 0;
1542}
1543
1544static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1545{
1546        struct net *net = sock_net(skb->sk);
1547        struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1548        struct xfrm_dump_info info;
1549
1550        BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1551                     sizeof(cb->args) - sizeof(cb->args[0]));
1552
1553        info.in_skb = cb->skb;
1554        info.out_skb = skb;
1555        info.nlmsg_seq = cb->nlh->nlmsg_seq;
1556        info.nlmsg_flags = NLM_F_MULTI;
1557
1558        if (!cb->args[0]) {
1559                cb->args[0] = 1;
1560                xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1561        }
1562
1563        (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1564
1565        return skb->len;
1566}
1567
1568static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1569                                          struct xfrm_policy *xp,
1570                                          int dir, u32 seq)
1571{
1572        struct xfrm_dump_info info;
1573        struct sk_buff *skb;
1574        int err;
1575
1576        skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1577        if (!skb)
1578                return ERR_PTR(-ENOMEM);
1579
1580        info.in_skb = in_skb;
1581        info.out_skb = skb;
1582        info.nlmsg_seq = seq;
1583        info.nlmsg_flags = 0;
1584
1585        err = dump_one_policy(xp, dir, 0, &info);
1586        if (err) {
1587                kfree_skb(skb);
1588                return ERR_PTR(err);
1589        }
1590
1591        return skb;
1592}
1593
1594static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1595                struct nlattr **attrs)
1596{
1597        struct net *net = sock_net(skb->sk);
1598        struct xfrm_policy *xp;
1599        struct xfrm_userpolicy_id *p;
1600        u8 type = XFRM_POLICY_TYPE_MAIN;
1601        int err;
1602        struct km_event c;
1603        int delete;
1604        struct xfrm_mark m;
1605        u32 mark = xfrm_mark_get(attrs, &m);
1606
1607        p = nlmsg_data(nlh);
1608        delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1609
1610        err = copy_from_user_policy_type(&type, attrs);
1611        if (err)
1612                return err;
1613
1614        err = verify_policy_dir(p->dir);
1615        if (err)
1616                return err;
1617
1618        if (p->index)
1619                xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
1620        else {
1621                struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1622                struct xfrm_sec_ctx *ctx;
1623
1624                err = verify_sec_ctx_len(attrs);
1625                if (err)
1626                        return err;
1627
1628                ctx = NULL;
1629                if (rt) {
1630                        struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1631
1632                        err = security_xfrm_policy_alloc(&ctx, uctx);
1633                        if (err)
1634                                return err;
1635                }
1636                xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
1637                                           ctx, delete, &err);
1638                security_xfrm_policy_free(ctx);
1639        }
1640        if (xp == NULL)
1641                return -ENOENT;
1642
1643        if (!delete) {
1644                struct sk_buff *resp_skb;
1645
1646                resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1647                if (IS_ERR(resp_skb)) {
1648                        err = PTR_ERR(resp_skb);
1649                } else {
1650                        err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1651                                            NETLINK_CB(skb).pid);
1652                }
1653        } else {
1654                uid_t loginuid = audit_get_loginuid(current);
1655                u32 sessionid = audit_get_sessionid(current);
1656                u32 sid;
1657
1658                security_task_getsecid(current, &sid);
1659                xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid,
1660                                         sid);
1661
1662                if (err != 0)
1663                        goto out;
1664
1665                c.data.byid = p->index;
1666                c.event = nlh->nlmsg_type;
1667                c.seq = nlh->nlmsg_seq;
1668                c.pid = nlh->nlmsg_pid;
1669                km_policy_notify(xp, p->dir, &c);
1670        }
1671
1672out:
1673        xfrm_pol_put(xp);
1674        return err;
1675}
1676
1677static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1678                struct nlattr **attrs)
1679{
1680        struct net *net = sock_net(skb->sk);
1681        struct km_event c;
1682        struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1683        struct xfrm_audit audit_info;
1684        int err;
1685
1686        audit_info.loginuid = audit_get_loginuid(current);
1687        audit_info.sessionid = audit_get_sessionid(current);
1688        security_task_getsecid(current, &audit_info.secid);
1689        err = xfrm_state_flush(net, p->proto, &audit_info);
1690        if (err) {
1691                if (err == -ESRCH) /* empty table */
1692                        return 0;
1693                return err;
1694        }
1695        c.data.proto = p->proto;
1696        c.event = nlh->nlmsg_type;
1697        c.seq = nlh->nlmsg_seq;
1698        c.pid = nlh->nlmsg_pid;
1699        c.net = net;
1700        km_state_notify(NULL, &c);
1701
1702        return 0;
1703}
1704
1705static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
1706{
1707        size_t replay_size = x->replay_esn ?
1708                              xfrm_replay_state_esn_len(x->replay_esn) :
1709                              sizeof(struct xfrm_replay_state);
1710
1711        return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1712               + nla_total_size(replay_size)
1713               + nla_total_size(sizeof(struct xfrm_lifetime_cur))
1714               + nla_total_size(sizeof(struct xfrm_mark))
1715               + nla_total_size(4) /* XFRM_AE_RTHR */
1716               + nla_total_size(4); /* XFRM_AE_ETHR */
1717}
1718
1719static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1720{
1721        struct xfrm_aevent_id *id;
1722        struct nlmsghdr *nlh;
1723        int err;
1724
1725        nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1726        if (nlh == NULL)
1727                return -EMSGSIZE;
1728
1729        id = nlmsg_data(nlh);
1730        memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));
1731        id->sa_id.spi = x->id.spi;
1732        id->sa_id.family = x->props.family;
1733        id->sa_id.proto = x->id.proto;
1734        memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
1735        id->reqid = x->props.reqid;
1736        id->flags = c->data.aevent;
1737
1738        if (x->replay_esn) {
1739                err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1740                              xfrm_replay_state_esn_len(x->replay_esn),
1741                              x->replay_esn);
1742        } else {
1743                err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1744                              &x->replay);
1745        }
1746        if (err)
1747                goto out_cancel;
1748        err = nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1749        if (err)
1750                goto out_cancel;
1751
1752        if (id->flags & XFRM_AE_RTHR) {
1753                err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1754                if (err)
1755                        goto out_cancel;
1756        }
1757        if (id->flags & XFRM_AE_ETHR) {
1758                err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1759                                  x->replay_maxage * 10 / HZ);
1760                if (err)
1761                        goto out_cancel;
1762        }
1763        err = xfrm_mark_put(skb, &x->mark);
1764        if (err)
1765                goto out_cancel;
1766
1767        return nlmsg_end(skb, nlh);
1768
1769out_cancel:
1770        nlmsg_cancel(skb, nlh);
1771        return err;
1772}
1773
1774static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1775                struct nlattr **attrs)
1776{
1777        struct net *net = sock_net(skb->sk);
1778        struct xfrm_state *x;
1779        struct sk_buff *r_skb;
1780        int err;
1781        struct km_event c;
1782        u32 mark;
1783        struct xfrm_mark m;
1784        struct xfrm_aevent_id *p = nlmsg_data(nlh);
1785        struct xfrm_usersa_id *id = &p->sa_id;
1786
1787        mark = xfrm_mark_get(attrs, &m);
1788
1789        x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
1790        if (x == NULL)
1791                return -ESRCH;
1792
1793        r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1794        if (r_skb == NULL) {
1795                xfrm_state_put(x);
1796                return -ENOMEM;
1797        }
1798
1799        /*
1800         * XXX: is this lock really needed - none of the other
1801         * gets lock (the concern is things getting updated
1802         * while we are still reading) - jhs
1803        */
1804        spin_lock_bh(&x->lock);
1805        c.data.aevent = p->flags;
1806        c.seq = nlh->nlmsg_seq;
1807        c.pid = nlh->nlmsg_pid;
1808
1809        if (build_aevent(r_skb, x, &c) < 0)
1810                BUG();
1811        err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).pid);
1812        spin_unlock_bh(&x->lock);
1813        xfrm_state_put(x);
1814        return err;
1815}
1816
1817static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1818                struct nlattr **attrs)
1819{
1820        struct net *net = sock_net(skb->sk);
1821        struct xfrm_state *x;
1822        struct km_event c;
1823        int err = - EINVAL;
1824        u32 mark = 0;
1825        struct xfrm_mark m;
1826        struct xfrm_aevent_id *p = nlmsg_data(nlh);
1827        struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1828        struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
1829        struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1830
1831        if (!lt && !rp && !re)
1832                return err;
1833
1834        /* pedantic mode - thou shalt sayeth replaceth */
1835        if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1836                return err;
1837
1838        mark = xfrm_mark_get(attrs, &m);
1839
1840        x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1841        if (x == NULL)
1842                return -ESRCH;
1843
1844        if (x->km.state != XFRM_STATE_VALID)
1845                goto out;
1846
1847        err = xfrm_replay_verify_len(x->replay_esn, rp);
1848        if (err)
1849                goto out;
1850
1851        spin_lock_bh(&x->lock);
1852        xfrm_update_ae_params(x, attrs, 1);
1853        spin_unlock_bh(&x->lock);
1854
1855        c.event = nlh->nlmsg_type;
1856        c.seq = nlh->nlmsg_seq;
1857        c.pid = nlh->nlmsg_pid;
1858        c.data.aevent = XFRM_AE_CU;
1859        km_state_notify(x, &c);
1860        err = 0;
1861out:
1862        xfrm_state_put(x);
1863        return err;
1864}
1865
1866static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1867                struct nlattr **attrs)
1868{
1869        struct net *net = sock_net(skb->sk);
1870        struct km_event c;
1871        u8 type = XFRM_POLICY_TYPE_MAIN;
1872        int err;
1873        struct xfrm_audit audit_info;
1874
1875        err = copy_from_user_policy_type(&type, attrs);
1876        if (err)
1877                return err;
1878
1879        audit_info.loginuid = audit_get_loginuid(current);
1880        audit_info.sessionid = audit_get_sessionid(current);
1881        security_task_getsecid(current, &audit_info.secid);
1882        err = xfrm_policy_flush(net, type, &audit_info);
1883        if (err) {
1884                if (err == -ESRCH) /* empty table */
1885                        return 0;
1886                return err;
1887        }
1888
1889        c.data.type = type;
1890        c.event = nlh->nlmsg_type;
1891        c.seq = nlh->nlmsg_seq;
1892        c.pid = nlh->nlmsg_pid;
1893        c.net = net;
1894        km_policy_notify(NULL, 0, &c);
1895        return 0;
1896}
1897
1898static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1899                struct nlattr **attrs)
1900{
1901        struct net *net = sock_net(skb->sk);
1902        struct xfrm_policy *xp;
1903        struct xfrm_user_polexpire *up = nlmsg_data(nlh);
1904        struct xfrm_userpolicy_info *p = &up->pol;
1905        u8 type = XFRM_POLICY_TYPE_MAIN;
1906        int err = -ENOENT;
1907        struct xfrm_mark m;
1908        u32 mark = xfrm_mark_get(attrs, &m);
1909
1910        err = copy_from_user_policy_type(&type, attrs);
1911        if (err)
1912                return err;
1913
1914        err = verify_policy_dir(p->dir);
1915        if (err)
1916                return err;
1917
1918        if (p->index)
1919                xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
1920        else {
1921                struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1922                struct xfrm_sec_ctx *ctx;
1923
1924                err = verify_sec_ctx_len(attrs);
1925                if (err)
1926                        return err;
1927
1928                ctx = NULL;
1929                if (rt) {
1930                        struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1931
1932                        err = security_xfrm_policy_alloc(&ctx, uctx);
1933                        if (err)
1934                                return err;
1935                }
1936                xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
1937                                           &p->sel, ctx, 0, &err);
1938                security_xfrm_policy_free(ctx);
1939        }
1940        if (xp == NULL)
1941                return -ENOENT;
1942
1943        if (unlikely(xp->walk.dead))
1944                goto out;
1945
1946        err = 0;
1947        if (up->hard) {
1948                uid_t loginuid = audit_get_loginuid(current);
1949                u32 sessionid = audit_get_sessionid(current);
1950                u32 sid;
1951
1952                security_task_getsecid(current, &sid);
1953                xfrm_policy_delete(xp, p->dir);
1954                xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid);
1955
1956        } else {
1957                // reset the timers here?
1958                WARN(1, "Dont know what to do with soft policy expire\n");
1959        }
1960        km_policy_expired(xp, p->dir, up->hard, current->pid);
1961
1962out:
1963        xfrm_pol_put(xp);
1964        return err;
1965}
1966
1967static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1968                struct nlattr **attrs)
1969{
1970        struct net *net = sock_net(skb->sk);
1971        struct xfrm_state *x;
1972        int err;
1973        struct xfrm_user_expire *ue = nlmsg_data(nlh);
1974        struct xfrm_usersa_info *p = &ue->state;
1975        struct xfrm_mark m;
1976        u32 mark = xfrm_mark_get(attrs, &m);
1977
1978        x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
1979
1980        err = -ENOENT;
1981        if (x == NULL)
1982                return err;
1983
1984        spin_lock_bh(&x->lock);
1985        err = -EINVAL;
1986        if (x->km.state != XFRM_STATE_VALID)
1987                goto out;
1988        km_state_expired(x, ue->hard, current->pid);
1989
1990        if (ue->hard) {
1991                uid_t loginuid = audit_get_loginuid(current);
1992                u32 sessionid = audit_get_sessionid(current);
1993                u32 sid;
1994
1995                security_task_getsecid(current, &sid);
1996                __xfrm_state_delete(x);
1997                xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid);
1998        }
1999        err = 0;
2000out:
2001        spin_unlock_bh(&x->lock);
2002        xfrm_state_put(x);
2003        return err;
2004}
2005
2006static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2007                struct nlattr **attrs)
2008{
2009        struct net *net = sock_net(skb->sk);
2010        struct xfrm_policy *xp;
2011        struct xfrm_user_tmpl *ut;
2012        int i;
2013        struct nlattr *rt = attrs[XFRMA_TMPL];
2014        struct xfrm_mark mark;
2015
2016        struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2017        struct xfrm_state *x = xfrm_state_alloc(net);
2018        int err = -ENOMEM;
2019
2020        if (!x)
2021                goto nomem;
2022
2023        xfrm_mark_get(attrs, &mark);
2024
2025        err = verify_newpolicy_info(&ua->policy);
2026        if (err)
2027                goto bad_policy;
2028
2029        /*   build an XP */
2030        xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2031        if (!xp)
2032                goto free_state;
2033
2034        memcpy(&x->id, &ua->id, sizeof(ua->id));
2035        memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2036        memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2037        xp->mark.m = x->mark.m = mark.m;
2038        xp->mark.v = x->mark.v = mark.v;
2039        ut = nla_data(rt);
2040        /* extract the templates and for each call km_key */
2041        for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2042                struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2043                memcpy(&x->id, &t->id, sizeof(x->id));
2044                x->props.mode = t->mode;
2045                x->props.reqid = t->reqid;
2046                x->props.family = ut->family;
2047                t->aalgos = ua->aalgos;
2048                t->ealgos = ua->ealgos;
2049                t->calgos = ua->calgos;
2050                err = km_query(x, t, xp);
2051
2052        }
2053
2054        kfree(x);
2055        kfree(xp);
2056
2057        return 0;
2058
2059bad_policy:
2060        WARN(1, "BAD policy passed\n");
2061free_state:
2062        kfree(x);
2063nomem:
2064        return err;
2065}
2066
2067#ifdef CONFIG_XFRM_MIGRATE
2068static int copy_from_user_migrate(struct xfrm_migrate *ma,
2069                                  struct xfrm_kmaddress *k,
2070                                  struct nlattr **attrs, int *num)
2071{
2072        struct nlattr *rt = attrs[XFRMA_MIGRATE];
2073        struct xfrm_user_migrate *um;
2074        int i, num_migrate;
2075
2076        if (k != NULL) {
2077                struct xfrm_user_kmaddress *uk;
2078
2079                uk = nla_data(attrs[XFRMA_KMADDRESS]);
2080                memcpy(&k->local, &uk->local, sizeof(k->local));
2081                memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2082                k->family = uk->family;
2083                k->reserved = uk->reserved;
2084        }
2085
2086        um = nla_data(rt);
2087        num_migrate = nla_len(rt) / sizeof(*um);
2088
2089        if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2090                return -EINVAL;
2091
2092        for (i = 0; i < num_migrate; i++, um++, ma++) {
2093                memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2094                memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2095                memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2096                memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2097
2098                ma->proto = um->proto;
2099                ma->mode = um->mode;
2100                ma->reqid = um->reqid;
2101
2102                ma->old_family = um->old_family;
2103                ma->new_family = um->new_family;
2104        }
2105
2106        *num = i;
2107        return 0;
2108}
2109
2110static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2111                           struct nlattr **attrs)
2112{
2113        struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2114        struct xfrm_migrate m[XFRM_MAX_DEPTH];
2115        struct xfrm_kmaddress km, *kmp;
2116        u8 type;
2117        int err;
2118        int n = 0;
2119
2120        if (attrs[XFRMA_MIGRATE] == NULL)
2121                return -EINVAL;
2122
2123        kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2124
2125        err = copy_from_user_policy_type(&type, attrs);
2126        if (err)
2127                return err;
2128
2129        err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2130        if (err)
2131                return err;
2132
2133        if (!n)
2134                return 0;
2135
2136        xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp);
2137
2138        return 0;
2139}
2140#else
2141static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2142                           struct nlattr **attrs)
2143{
2144        return -ENOPROTOOPT;
2145}
2146#endif
2147
2148#ifdef CONFIG_XFRM_MIGRATE
2149static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2150{
2151        struct xfrm_user_migrate um;
2152
2153        memset(&um, 0, sizeof(um));
2154        um.proto = m->proto;
2155        um.mode = m->mode;
2156        um.reqid = m->reqid;
2157        um.old_family = m->old_family;
2158        memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2159        memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2160        um.new_family = m->new_family;
2161        memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2162        memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2163
2164        return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2165}
2166
2167static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2168{
2169        struct xfrm_user_kmaddress uk;
2170
2171        memset(&uk, 0, sizeof(uk));
2172        uk.family = k->family;
2173        uk.reserved = k->reserved;
2174        memcpy(&uk.local, &k->local, sizeof(uk.local));
2175        memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2176
2177        return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2178}
2179
2180static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
2181{
2182        return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2183              + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2184              + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2185              + userpolicy_type_attrsize();
2186}
2187
2188static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2189                         int num_migrate, const struct xfrm_kmaddress *k,
2190                         const struct xfrm_selector *sel, u8 dir, u8 type)
2191{
2192        const struct xfrm_migrate *mp;
2193        struct xfrm_userpolicy_id *pol_id;
2194        struct nlmsghdr *nlh;
2195        int i, err;
2196
2197        nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2198        if (nlh == NULL)
2199                return -EMSGSIZE;
2200
2201        pol_id = nlmsg_data(nlh);
2202        /* copy data from selector, dir, and type to the pol_id */
2203        memset(pol_id, 0, sizeof(*pol_id));
2204        memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2205        pol_id->dir = dir;
2206
2207        if (k != NULL) {
2208                err = copy_to_user_kmaddress(k, skb);
2209                if (err)
2210                        goto out_cancel;
2211        }
2212        err = copy_to_user_policy_type(type, skb);
2213        if (err)
2214                goto out_cancel;
2215        for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2216                err = copy_to_user_migrate(mp, skb);
2217                if (err)
2218                        goto out_cancel;
2219        }
2220
2221        return nlmsg_end(skb, nlh);
2222
2223out_cancel:
2224        nlmsg_cancel(skb, nlh);
2225        return err;
2226}
2227
2228static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2229                             const struct xfrm_migrate *m, int num_migrate,
2230                             const struct xfrm_kmaddress *k)
2231{
2232        struct net *net = &init_net;
2233        struct sk_buff *skb;
2234
2235        skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
2236        if (skb == NULL)
2237                return -ENOMEM;
2238
2239        /* build migrate */
2240        if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
2241                BUG();
2242
2243        return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC);
2244}
2245#else
2246static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2247                             const struct xfrm_migrate *m, int num_migrate,
2248                             const struct xfrm_kmaddress *k)
2249{
2250        return -ENOPROTOOPT;
2251}
2252#endif
2253
2254#define XMSGSIZE(type) sizeof(struct type)
2255
2256static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2257        [XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2258        [XFRM_MSG_DELSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2259        [XFRM_MSG_GETSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2260        [XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2261        [XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2262        [XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2263        [XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2264        [XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2265        [XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2266        [XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2267        [XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2268        [XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2269        [XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2270        [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2271        [XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2272        [XFRM_MSG_GETAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2273        [XFRM_MSG_REPORT      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2274        [XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2275        [XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = sizeof(u32),
2276        [XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = sizeof(u32),
2277};
2278
2279#undef XMSGSIZE
2280
2281static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2282        [XFRMA_SA]              = { .len = sizeof(struct xfrm_usersa_info)},
2283        [XFRMA_POLICY]          = { .len = sizeof(struct xfrm_userpolicy_info)},
2284        [XFRMA_LASTUSED]        = { .type = NLA_U64},
2285        [XFRMA_ALG_AUTH_TRUNC]  = { .len = sizeof(struct xfrm_algo_auth)},
2286        [XFRMA_ALG_AEAD]        = { .len = sizeof(struct xfrm_algo_aead) },
2287        [XFRMA_ALG_AUTH]        = { .len = sizeof(struct xfrm_algo) },
2288        [XFRMA_ALG_CRYPT]       = { .len = sizeof(struct xfrm_algo) },
2289        [XFRMA_ALG_COMP]        = { .len = sizeof(struct xfrm_algo) },
2290        [XFRMA_ENCAP]           = { .len = sizeof(struct xfrm_encap_tmpl) },
2291        [XFRMA_TMPL]            = { .len = sizeof(struct xfrm_user_tmpl) },
2292        [XFRMA_SEC_CTX]         = { .len = sizeof(struct xfrm_sec_ctx) },
2293        [XFRMA_LTIME_VAL]       = { .len = sizeof(struct xfrm_lifetime_cur) },
2294        [XFRMA_REPLAY_VAL]      = { .len = sizeof(struct xfrm_replay_state) },
2295        [XFRMA_REPLAY_THRESH]   = { .type = NLA_U32 },
2296        [XFRMA_ETIMER_THRESH]   = { .type = NLA_U32 },
2297        [XFRMA_SRCADDR]         = { .len = sizeof(xfrm_address_t) },
2298        [XFRMA_COADDR]          = { .len = sizeof(xfrm_address_t) },
2299        [XFRMA_POLICY_TYPE]     = { .len = sizeof(struct xfrm_userpolicy_type)},
2300        [XFRMA_MIGRATE]         = { .len = sizeof(struct xfrm_user_migrate) },
2301        [XFRMA_KMADDRESS]       = { .len = sizeof(struct xfrm_user_kmaddress) },
2302        [XFRMA_MARK]            = { .len = sizeof(struct xfrm_mark) },
2303        [XFRMA_TFCPAD]          = { .type = NLA_U32 },
2304        [XFRMA_REPLAY_ESN_VAL]  = { .len = sizeof(struct xfrm_replay_state_esn) },
2305};
2306
2307static struct xfrm_link {
2308        int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2309        int (*dump)(struct sk_buff *, struct netlink_callback *);
2310        int (*done)(struct netlink_callback *);
2311} xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2312        [XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
2313        [XFRM_MSG_DELSA       - XFRM_MSG_BASE] = { .doit = xfrm_del_sa        },
2314        [XFRM_MSG_GETSA       - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2315                                                   .dump = xfrm_dump_sa,
2316                                                   .done = xfrm_dump_sa_done  },
2317        [XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
2318        [XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy    },
2319        [XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2320                                                   .dump = xfrm_dump_policy,
2321                                                   .done = xfrm_dump_policy_done },
2322        [XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2323        [XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire   },
2324        [XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2325        [XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
2326        [XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
2327        [XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2328        [XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa      },
2329        [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy  },
2330        [XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = { .doit = xfrm_new_ae  },
2331        [XFRM_MSG_GETAE       - XFRM_MSG_BASE] = { .doit = xfrm_get_ae  },
2332        [XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate    },
2333        [XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo   },
2334        [XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo   },
2335};
2336
2337static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2338{
2339        struct net *net = sock_net(skb->sk);
2340        struct nlattr *attrs[XFRMA_MAX+1];
2341        struct xfrm_link *link;
2342        int type, err;
2343
2344        type = nlh->nlmsg_type;
2345        if (type > XFRM_MSG_MAX)
2346                return -EINVAL;
2347
2348        type -= XFRM_MSG_BASE;
2349        link = &xfrm_dispatch[type];
2350
2351        /* All operations require privileges, even GET */
2352        if (!capable(CAP_NET_ADMIN))
2353                return -EPERM;
2354
2355        if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2356             type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2357            (nlh->nlmsg_flags & NLM_F_DUMP)) {
2358                if (link->dump == NULL)
2359                        return -EINVAL;
2360
2361                {
2362                        struct netlink_dump_control c = {
2363                                .dump = link->dump,
2364                                .done = link->done,
2365                        };
2366                        return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2367                }
2368        }
2369
2370        err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,
2371                          xfrma_policy);
2372        if (err < 0)
2373                return err;
2374
2375        if (link->doit == NULL)
2376                return -EINVAL;
2377
2378        return link->doit(skb, nlh, attrs);
2379}
2380
2381static void xfrm_netlink_rcv(struct sk_buff *skb)
2382{
2383        mutex_lock(&xfrm_cfg_mutex);
2384        netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2385        mutex_unlock(&xfrm_cfg_mutex);
2386}
2387
2388static inline size_t xfrm_expire_msgsize(void)
2389{
2390        return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2391               + nla_total_size(sizeof(struct xfrm_mark));
2392}
2393
2394static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2395{
2396        struct xfrm_user_expire *ue;
2397        struct nlmsghdr *nlh;
2398        int err;
2399
2400        nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2401        if (nlh == NULL)
2402                return -EMSGSIZE;
2403
2404        ue = nlmsg_data(nlh);
2405        copy_to_user_state(x, &ue->state);
2406        ue->hard = (c->data.hard != 0) ? 1 : 0;
2407
2408        err = xfrm_mark_put(skb, &x->mark);
2409        if (err)
2410                return err;
2411
2412        return nlmsg_end(skb, nlh);
2413}
2414
2415static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2416{
2417        struct net *net = xs_net(x);
2418        struct sk_buff *skb;
2419
2420        skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2421        if (skb == NULL)
2422                return -ENOMEM;
2423
2424        if (build_expire(skb, x, c) < 0) {
2425                kfree_skb(skb);
2426                return -EMSGSIZE;
2427        }
2428
2429        return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2430}
2431
2432static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2433{
2434        struct net *net = xs_net(x);
2435        struct sk_buff *skb;
2436
2437        skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2438        if (skb == NULL)
2439                return -ENOMEM;
2440
2441        if (build_aevent(skb, x, c) < 0)
2442                BUG();
2443
2444        return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
2445}
2446
2447static int xfrm_notify_sa_flush(const struct km_event *c)
2448{
2449        struct net *net = c->net;
2450        struct xfrm_usersa_flush *p;
2451        struct nlmsghdr *nlh;
2452        struct sk_buff *skb;
2453        int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2454
2455        skb = nlmsg_new(len, GFP_ATOMIC);
2456        if (skb == NULL)
2457                return -ENOMEM;
2458
2459        nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2460        if (nlh == NULL) {
2461                kfree_skb(skb);
2462                return -EMSGSIZE;
2463        }
2464
2465        p = nlmsg_data(nlh);
2466        p->proto = c->data.proto;
2467
2468        nlmsg_end(skb, nlh);
2469
2470        return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2471}
2472
2473static inline size_t xfrm_sa_len(struct xfrm_state *x)
2474{
2475        size_t l = 0;
2476        if (x->aead)
2477                l += nla_total_size(aead_len(x->aead));
2478        if (x->aalg) {
2479                l += nla_total_size(sizeof(struct xfrm_algo) +
2480                                    (x->aalg->alg_key_len + 7) / 8);
2481                l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2482        }
2483        if (x->ealg)
2484                l += nla_total_size(xfrm_alg_len(x->ealg));
2485        if (x->calg)
2486                l += nla_total_size(sizeof(*x->calg));
2487        if (x->encap)
2488                l += nla_total_size(sizeof(*x->encap));
2489        if (x->tfcpad)
2490                l += nla_total_size(sizeof(x->tfcpad));
2491        if (x->replay_esn)
2492                l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2493        if (x->security)
2494                l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2495                                    x->security->ctx_len);
2496        if (x->coaddr)
2497                l += nla_total_size(sizeof(*x->coaddr));
2498
2499        /* Must count x->lastused as it may become non-zero behind our back. */
2500        l += nla_total_size(sizeof(u64));
2501
2502        return l;
2503}
2504
2505static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2506{
2507        struct net *net = xs_net(x);
2508        struct xfrm_usersa_info *p;
2509        struct xfrm_usersa_id *id;
2510        struct nlmsghdr *nlh;
2511        struct sk_buff *skb;
2512        int len = xfrm_sa_len(x);
2513        int headlen, err;
2514
2515        headlen = sizeof(*p);
2516        if (c->event == XFRM_MSG_DELSA) {
2517                len += nla_total_size(headlen);
2518                headlen = sizeof(*id);
2519                len += nla_total_size(sizeof(struct xfrm_mark));
2520        }
2521        len += NLMSG_ALIGN(headlen);
2522
2523        skb = nlmsg_new(len, GFP_ATOMIC);
2524        if (skb == NULL)
2525                return -ENOMEM;
2526
2527        nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
2528        err = -EMSGSIZE;
2529        if (nlh == NULL)
2530                goto out_free_skb;
2531
2532        p = nlmsg_data(nlh);
2533        if (c->event == XFRM_MSG_DELSA) {
2534                struct nlattr *attr;
2535
2536                id = nlmsg_data(nlh);
2537                memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2538                id->spi = x->id.spi;
2539                id->family = x->props.family;
2540                id->proto = x->id.proto;
2541
2542                attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2543                err = -EMSGSIZE;
2544                if (attr == NULL)
2545                        goto out_free_skb;
2546
2547                p = nla_data(attr);
2548        }
2549        err = copy_to_user_state_extra(x, p, skb);
2550        if (err)
2551                goto out_free_skb;
2552
2553        nlmsg_end(skb, nlh);
2554
2555        return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2556
2557out_free_skb:
2558        kfree_skb(skb);
2559        return err;
2560}
2561
2562static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2563{
2564
2565        switch (c->event) {
2566        case XFRM_MSG_EXPIRE:
2567                return xfrm_exp_state_notify(x, c);
2568        case XFRM_MSG_NEWAE:
2569                return xfrm_aevent_state_notify(x, c);
2570        case XFRM_MSG_DELSA:
2571        case XFRM_MSG_UPDSA:
2572        case XFRM_MSG_NEWSA:
2573                return xfrm_notify_sa(x, c);
2574        case XFRM_MSG_FLUSHSA:
2575                return xfrm_notify_sa_flush(c);
2576        default:
2577                printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2578                       c->event);
2579                break;
2580        }
2581
2582        return 0;
2583
2584}
2585
2586static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2587                                          struct xfrm_policy *xp)
2588{
2589        return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2590               + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2591               + nla_total_size(sizeof(struct xfrm_mark))
2592               + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2593               + userpolicy_type_attrsize();
2594}
2595
2596static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2597                         struct xfrm_tmpl *xt, struct xfrm_policy *xp,
2598                         int dir)
2599{
2600        __u32 seq = xfrm_get_acqseq();
2601        struct xfrm_user_acquire *ua;
2602        struct nlmsghdr *nlh;
2603        int err;
2604
2605        nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2606        if (nlh == NULL)
2607                return -EMSGSIZE;
2608
2609        ua = nlmsg_data(nlh);
2610        memcpy(&ua->id, &x->id, sizeof(ua->id));
2611        memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2612        memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2613        copy_to_user_policy(xp, &ua->policy, dir);
2614        ua->aalgos = xt->aalgos;
2615        ua->ealgos = xt->ealgos;
2616        ua->calgos = xt->calgos;
2617        ua->seq = x->km.seq = seq;
2618
2619        err = copy_to_user_tmpl(xp, skb);
2620        if (!err)
2621                err = copy_to_user_state_sec_ctx(x, skb);
2622        if (!err)
2623                err = copy_to_user_policy_type(xp->type, skb);
2624        if (!err)
2625                err = xfrm_mark_put(skb, &xp->mark);
2626        if (err) {
2627                nlmsg_cancel(skb, nlh);
2628                return err;
2629        }
2630
2631        return nlmsg_end(skb, nlh);
2632}
2633
2634static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2635                             struct xfrm_policy *xp, int dir)
2636{
2637        struct net *net = xs_net(x);
2638        struct sk_buff *skb;
2639
2640        skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2641        if (skb == NULL)
2642                return -ENOMEM;
2643
2644        if (build_acquire(skb, x, xt, xp, dir) < 0)
2645                BUG();
2646
2647        return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
2648}
2649
2650/* User gives us xfrm_user_policy_info followed by an array of 0
2651 * or more templates.
2652 */
2653static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2654                                               u8 *data, int len, int *dir)
2655{
2656        struct net *net = sock_net(sk);
2657        struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2658        struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2659        struct xfrm_policy *xp;
2660        int nr;
2661
2662        switch (sk->sk_family) {
2663        case AF_INET:
2664                if (opt != IP_XFRM_POLICY) {
2665                        *dir = -EOPNOTSUPP;
2666                        return NULL;
2667                }
2668                break;
2669#if IS_ENABLED(CONFIG_IPV6)
2670        case AF_INET6:
2671                if (opt != IPV6_XFRM_POLICY) {
2672                        *dir = -EOPNOTSUPP;
2673                        return NULL;
2674                }
2675                break;
2676#endif
2677        default:
2678                *dir = -EINVAL;
2679                return NULL;
2680        }
2681
2682        *dir = -EINVAL;
2683
2684        if (len < sizeof(*p) ||
2685            verify_newpolicy_info(p))
2686                return NULL;
2687
2688        nr = ((len - sizeof(*p)) / sizeof(*ut));
2689        if (validate_tmpl(nr, ut, p->sel.family))
2690                return NULL;
2691
2692        if (p->dir > XFRM_POLICY_OUT)
2693                return NULL;
2694
2695        xp = xfrm_policy_alloc(net, GFP_ATOMIC);
2696        if (xp == NULL) {
2697                *dir = -ENOBUFS;
2698                return NULL;
2699        }
2700
2701        copy_from_user_policy(xp, p);
2702        xp->type = XFRM_POLICY_TYPE_MAIN;
2703        copy_templates(xp, ut, nr);
2704
2705        *dir = p->dir;
2706
2707        return xp;
2708}
2709
2710static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2711{
2712        return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2713               + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2714               + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2715               + nla_total_size(sizeof(struct xfrm_mark))
2716               + userpolicy_type_attrsize();
2717}
2718
2719static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2720                           int dir, const struct km_event *c)
2721{
2722        struct xfrm_user_polexpire *upe;
2723        int hard = c->data.hard;
2724        struct nlmsghdr *nlh;
2725        int err;
2726
2727        nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2728        if (nlh == NULL)
2729                return -EMSGSIZE;
2730
2731        upe = nlmsg_data(nlh);
2732        copy_to_user_policy(xp, &upe->pol, dir);
2733        err = copy_to_user_tmpl(xp, skb);
2734        if (!err)
2735                err = copy_to_user_sec_ctx(xp, skb);
2736        if (!err)
2737                err = copy_to_user_policy_type(xp->type, skb);
2738        if (!err)
2739                err = xfrm_mark_put(skb, &xp->mark);
2740        if (err) {
2741                nlmsg_cancel(skb, nlh);
2742                return err;
2743        }
2744        upe->hard = !!hard;
2745
2746        return nlmsg_end(skb, nlh);
2747}
2748
2749static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2750{
2751        struct net *net = xp_net(xp);
2752        struct sk_buff *skb;
2753
2754        skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2755        if (skb == NULL)
2756                return -ENOMEM;
2757
2758        if (build_polexpire(skb, xp, dir, c) < 0)
2759                BUG();
2760
2761        return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2762}
2763
2764static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2765{
2766        int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2767        struct net *net = xp_net(xp);
2768        struct xfrm_userpolicy_info *p;
2769        struct xfrm_userpolicy_id *id;
2770        struct nlmsghdr *nlh;
2771        struct sk_buff *skb;
2772        int headlen, err;
2773
2774        headlen = sizeof(*p);
2775        if (c->event == XFRM_MSG_DELPOLICY) {
2776                len += nla_total_size(headlen);
2777                headlen = sizeof(*id);
2778        }
2779        len += userpolicy_type_attrsize();
2780        len += nla_total_size(sizeof(struct xfrm_mark));
2781        len += NLMSG_ALIGN(headlen);
2782
2783        skb = nlmsg_new(len, GFP_ATOMIC);
2784        if (skb == NULL)
2785                return -ENOMEM;
2786
2787        nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
2788        err = -EMSGSIZE;
2789        if (nlh == NULL)
2790                goto out_free_skb;
2791
2792        p = nlmsg_data(nlh);
2793        if (c->event == XFRM_MSG_DELPOLICY) {
2794                struct nlattr *attr;
2795
2796                id = nlmsg_data(nlh);
2797                memset(id, 0, sizeof(*id));
2798                id->dir = dir;
2799                if (c->data.byid)
2800                        id->index = xp->index;
2801                else
2802                        memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2803
2804                attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2805                err = -EMSGSIZE;
2806                if (attr == NULL)
2807                        goto out_free_skb;
2808
2809                p = nla_data(attr);
2810        }
2811
2812        copy_to_user_policy(xp, p, dir);
2813        err = copy_to_user_tmpl(xp, skb);
2814        if (!err)
2815                err = copy_to_user_policy_type(xp->type, skb);
2816        if (!err)
2817                err = xfrm_mark_put(skb, &xp->mark);
2818        if (err)
2819                goto out_free_skb;
2820
2821        nlmsg_end(skb, nlh);
2822
2823        return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2824
2825out_free_skb:
2826        kfree_skb(skb);
2827        return err;
2828}
2829
2830static int xfrm_notify_policy_flush(const struct km_event *c)
2831{
2832        struct net *net = c->net;
2833        struct nlmsghdr *nlh;
2834        struct sk_buff *skb;
2835        int err;
2836
2837        skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
2838        if (skb == NULL)
2839                return -ENOMEM;
2840
2841        nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
2842        err = -EMSGSIZE;
2843        if (nlh == NULL)
2844                goto out_free_skb;
2845        err = copy_to_user_policy_type(c->data.type, skb);
2846        if (err)
2847                goto out_free_skb;
2848
2849        nlmsg_end(skb, nlh);
2850
2851        return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2852
2853out_free_skb:
2854        kfree_skb(skb);
2855        return err;
2856}
2857
2858static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2859{
2860
2861        switch (c->event) {
2862        case XFRM_MSG_NEWPOLICY:
2863        case XFRM_MSG_UPDPOLICY:
2864        case XFRM_MSG_DELPOLICY:
2865                return xfrm_notify_policy(xp, dir, c);
2866        case XFRM_MSG_FLUSHPOLICY:
2867                return xfrm_notify_policy_flush(c);
2868        case XFRM_MSG_POLEXPIRE:
2869                return xfrm_exp_policy_notify(xp, dir, c);
2870        default:
2871                printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
2872                       c->event);
2873        }
2874
2875        return 0;
2876
2877}
2878
2879static inline size_t xfrm_report_msgsize(void)
2880{
2881        return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2882}
2883
2884static int build_report(struct sk_buff *skb, u8 proto,
2885                        struct xfrm_selector *sel, xfrm_address_t *addr)
2886{
2887        struct xfrm_user_report *ur;
2888        struct nlmsghdr *nlh;
2889
2890        nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2891        if (nlh == NULL)
2892                return -EMSGSIZE;
2893
2894        ur = nlmsg_data(nlh);
2895        ur->proto = proto;
2896        memcpy(&ur->sel, sel, sizeof(ur->sel));
2897
2898        if (addr) {
2899                int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
2900                if (err) {
2901                        nlmsg_cancel(skb, nlh);
2902                        return err;
2903                }
2904        }
2905        return nlmsg_end(skb, nlh);
2906}
2907
2908static int xfrm_send_report(struct net *net, u8 proto,
2909                            struct xfrm_selector *sel, xfrm_address_t *addr)
2910{
2911        struct sk_buff *skb;
2912
2913        skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
2914        if (skb == NULL)
2915                return -ENOMEM;
2916
2917        if (build_report(skb, proto, sel, addr) < 0)
2918                BUG();
2919
2920        return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
2921}
2922
2923static inline size_t xfrm_mapping_msgsize(void)
2924{
2925        return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
2926}
2927
2928static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
2929                         xfrm_address_t *new_saddr, __be16 new_sport)
2930{
2931        struct xfrm_user_mapping *um;
2932        struct nlmsghdr *nlh;
2933
2934        nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
2935        if (nlh == NULL)
2936                return -EMSGSIZE;
2937
2938        um = nlmsg_data(nlh);
2939
2940        memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
2941        um->id.spi = x->id.spi;
2942        um->id.family = x->props.family;
2943        um->id.proto = x->id.proto;
2944        memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
2945        memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
2946        um->new_sport = new_sport;
2947        um->old_sport = x->encap->encap_sport;
2948        um->reqid = x->props.reqid;
2949
2950        return nlmsg_end(skb, nlh);
2951}
2952
2953static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
2954                             __be16 sport)
2955{
2956        struct net *net = xs_net(x);
2957        struct sk_buff *skb;
2958
2959        if (x->id.proto != IPPROTO_ESP)
2960                return -EINVAL;
2961
2962        if (!x->encap)
2963                return -EINVAL;
2964
2965        skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
2966        if (skb == NULL)
2967                return -ENOMEM;
2968
2969        if (build_mapping(skb, x, ipaddr, sport) < 0)
2970                BUG();
2971
2972        return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MAPPING, GFP_ATOMIC);
2973}
2974
2975static struct xfrm_mgr netlink_mgr = {
2976        .id             = "netlink",
2977        .notify         = xfrm_send_state_notify,
2978        .acquire        = xfrm_send_acquire,
2979        .compile_policy = xfrm_compile_policy,
2980        .notify_policy  = xfrm_send_policy_notify,
2981        .report         = xfrm_send_report,
2982        .migrate        = xfrm_send_migrate,
2983        .new_mapping    = xfrm_send_mapping,
2984};
2985
2986static int __net_init xfrm_user_net_init(struct net *net)
2987{
2988        struct sock *nlsk;
2989        struct netlink_kernel_cfg cfg = {
2990                .groups = XFRMNLGRP_MAX,
2991                .input  = xfrm_netlink_rcv,
2992        };
2993
2994        nlsk = netlink_kernel_create(net, NETLINK_XFRM, THIS_MODULE, &cfg);
2995        if (nlsk == NULL)
2996                return -ENOMEM;
2997        net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
2998        rcu_assign_pointer(net->xfrm.nlsk, nlsk);
2999        return 0;
3000}
3001
3002static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3003{
3004        struct net *net;
3005        list_for_each_entry(net, net_exit_list, exit_list)
3006                RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3007        synchronize_net();
3008        list_for_each_entry(net, net_exit_list, exit_list)
3009                netlink_kernel_release(net->xfrm.nlsk_stash);
3010}
3011
3012static struct pernet_operations xfrm_user_net_ops = {
3013        .init       = xfrm_user_net_init,
3014        .exit_batch = xfrm_user_net_exit,
3015};
3016
3017static int __init xfrm_user_init(void)
3018{
3019        int rv;
3020
3021        printk(KERN_INFO "Initializing XFRM netlink socket\n");
3022
3023        rv = register_pernet_subsys(&xfrm_user_net_ops);
3024        if (rv < 0)
3025                return rv;
3026        rv = xfrm_register_km(&netlink_mgr);
3027        if (rv < 0)
3028                unregister_pernet_subsys(&xfrm_user_net_ops);
3029        return rv;
3030}
3031
3032static void __exit xfrm_user_exit(void)
3033{
3034        xfrm_unregister_km(&netlink_mgr);
3035        unregister_pernet_subsys(&xfrm_user_net_ops);
3036}
3037
3038module_init(xfrm_user_init);
3039module_exit(xfrm_user_exit);
3040MODULE_LICENSE("GPL");
3041MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
3042
3043
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