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 <linux/uaccess.h> 31 #if IS_ENABLED(CONFIG_IPV6) 32 #include <linux/in6.h> 33 #endif 34 #include <asm/unaligned.h> 35 36 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type) 37 { 38 struct nlattr *rt = attrs[type]; 39 struct xfrm_algo *algp; 40 41 if (!rt) 42 return 0; 43 44 algp = nla_data(rt); 45 if (nla_len(rt) < xfrm_alg_len(algp)) 46 return -EINVAL; 47 48 switch (type) { 49 case XFRMA_ALG_AUTH: 50 case XFRMA_ALG_CRYPT: 51 case XFRMA_ALG_COMP: 52 break; 53 54 default: 55 return -EINVAL; 56 } 57 58 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; 59 return 0; 60 } 61 62 static int verify_auth_trunc(struct nlattr **attrs) 63 { 64 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC]; 65 struct xfrm_algo_auth *algp; 66 67 if (!rt) 68 return 0; 69 70 algp = nla_data(rt); 71 if (nla_len(rt) < xfrm_alg_auth_len(algp)) 72 return -EINVAL; 73 74 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; 75 return 0; 76 } 77 78 static int verify_aead(struct nlattr **attrs) 79 { 80 struct nlattr *rt = attrs[XFRMA_ALG_AEAD]; 81 struct xfrm_algo_aead *algp; 82 83 if (!rt) 84 return 0; 85 86 algp = nla_data(rt); 87 if (nla_len(rt) < aead_len(algp)) 88 return -EINVAL; 89 90 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; 91 return 0; 92 } 93 94 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type, 95 xfrm_address_t **addrp) 96 { 97 struct nlattr *rt = attrs[type]; 98 99 if (rt && addrp) 100 *addrp = nla_data(rt); 101 } 102 103 static inline int verify_sec_ctx_len(struct nlattr **attrs) 104 { 105 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 106 struct xfrm_user_sec_ctx *uctx; 107 108 if (!rt) 109 return 0; 110 111 uctx = nla_data(rt); 112 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len)) 113 return -EINVAL; 114 115 return 0; 116 } 117 118 static inline int verify_replay(struct xfrm_usersa_info *p, 119 struct nlattr **attrs) 120 { 121 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL]; 122 struct xfrm_replay_state_esn *rs; 123 124 if (p->flags & XFRM_STATE_ESN) { 125 if (!rt) 126 return -EINVAL; 127 128 rs = nla_data(rt); 129 130 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8) 131 return -EINVAL; 132 133 if (nla_len(rt) < xfrm_replay_state_esn_len(rs) && 134 nla_len(rt) != sizeof(*rs)) 135 return -EINVAL; 136 } 137 138 if (!rt) 139 return 0; 140 141 /* As only ESP and AH support ESN feature. */ 142 if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH)) 143 return -EINVAL; 144 145 if (p->replay_window != 0) 146 return -EINVAL; 147 148 return 0; 149 } 150 151 static int verify_newsa_info(struct xfrm_usersa_info *p, 152 struct nlattr **attrs) 153 { 154 int err; 155 156 err = -EINVAL; 157 switch (p->family) { 158 case AF_INET: 159 break; 160 161 case AF_INET6: 162 #if IS_ENABLED(CONFIG_IPV6) 163 break; 164 #else 165 err = -EAFNOSUPPORT; 166 goto out; 167 #endif 168 169 default: 170 goto out; 171 } 172 173 err = -EINVAL; 174 switch (p->id.proto) { 175 case IPPROTO_AH: 176 if ((!attrs[XFRMA_ALG_AUTH] && 177 !attrs[XFRMA_ALG_AUTH_TRUNC]) || 178 attrs[XFRMA_ALG_AEAD] || 179 attrs[XFRMA_ALG_CRYPT] || 180 attrs[XFRMA_ALG_COMP] || 181 attrs[XFRMA_TFCPAD]) 182 goto out; 183 break; 184 185 case IPPROTO_ESP: 186 if (attrs[XFRMA_ALG_COMP]) 187 goto out; 188 if (!attrs[XFRMA_ALG_AUTH] && 189 !attrs[XFRMA_ALG_AUTH_TRUNC] && 190 !attrs[XFRMA_ALG_CRYPT] && 191 !attrs[XFRMA_ALG_AEAD]) 192 goto out; 193 if ((attrs[XFRMA_ALG_AUTH] || 194 attrs[XFRMA_ALG_AUTH_TRUNC] || 195 attrs[XFRMA_ALG_CRYPT]) && 196 attrs[XFRMA_ALG_AEAD]) 197 goto out; 198 if (attrs[XFRMA_TFCPAD] && 199 p->mode != XFRM_MODE_TUNNEL) 200 goto out; 201 break; 202 203 case IPPROTO_COMP: 204 if (!attrs[XFRMA_ALG_COMP] || 205 attrs[XFRMA_ALG_AEAD] || 206 attrs[XFRMA_ALG_AUTH] || 207 attrs[XFRMA_ALG_AUTH_TRUNC] || 208 attrs[XFRMA_ALG_CRYPT] || 209 attrs[XFRMA_TFCPAD] || 210 (ntohl(p->id.spi) >= 0x10000)) 211 goto out; 212 break; 213 214 #if IS_ENABLED(CONFIG_IPV6) 215 case IPPROTO_DSTOPTS: 216 case IPPROTO_ROUTING: 217 if (attrs[XFRMA_ALG_COMP] || 218 attrs[XFRMA_ALG_AUTH] || 219 attrs[XFRMA_ALG_AUTH_TRUNC] || 220 attrs[XFRMA_ALG_AEAD] || 221 attrs[XFRMA_ALG_CRYPT] || 222 attrs[XFRMA_ENCAP] || 223 attrs[XFRMA_SEC_CTX] || 224 attrs[XFRMA_TFCPAD] || 225 !attrs[XFRMA_COADDR]) 226 goto out; 227 break; 228 #endif 229 230 default: 231 goto out; 232 } 233 234 if ((err = verify_aead(attrs))) 235 goto out; 236 if ((err = verify_auth_trunc(attrs))) 237 goto out; 238 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH))) 239 goto out; 240 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT))) 241 goto out; 242 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP))) 243 goto out; 244 if ((err = verify_sec_ctx_len(attrs))) 245 goto out; 246 if ((err = verify_replay(p, attrs))) 247 goto out; 248 249 err = -EINVAL; 250 switch (p->mode) { 251 case XFRM_MODE_TRANSPORT: 252 case XFRM_MODE_TUNNEL: 253 case XFRM_MODE_ROUTEOPTIMIZATION: 254 case XFRM_MODE_BEET: 255 break; 256 257 default: 258 goto out; 259 } 260 261 err = 0; 262 263 out: 264 return err; 265 } 266 267 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props, 268 struct xfrm_algo_desc *(*get_byname)(const char *, int), 269 struct nlattr *rta) 270 { 271 struct xfrm_algo *p, *ualg; 272 struct xfrm_algo_desc *algo; 273 274 if (!rta) 275 return 0; 276 277 ualg = nla_data(rta); 278 279 algo = get_byname(ualg->alg_name, 1); 280 if (!algo) 281 return -ENOSYS; 282 *props = algo->desc.sadb_alg_id; 283 284 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL); 285 if (!p) 286 return -ENOMEM; 287 288 strcpy(p->alg_name, algo->name); 289 *algpp = p; 290 return 0; 291 } 292 293 static int attach_crypt(struct xfrm_state *x, struct nlattr *rta) 294 { 295 struct xfrm_algo *p, *ualg; 296 struct xfrm_algo_desc *algo; 297 298 if (!rta) 299 return 0; 300 301 ualg = nla_data(rta); 302 303 algo = xfrm_ealg_get_byname(ualg->alg_name, 1); 304 if (!algo) 305 return -ENOSYS; 306 x->props.ealgo = algo->desc.sadb_alg_id; 307 308 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL); 309 if (!p) 310 return -ENOMEM; 311 312 strcpy(p->alg_name, algo->name); 313 x->ealg = p; 314 x->geniv = algo->uinfo.encr.geniv; 315 return 0; 316 } 317 318 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props, 319 struct nlattr *rta) 320 { 321 struct xfrm_algo *ualg; 322 struct xfrm_algo_auth *p; 323 struct xfrm_algo_desc *algo; 324 325 if (!rta) 326 return 0; 327 328 ualg = nla_data(rta); 329 330 algo = xfrm_aalg_get_byname(ualg->alg_name, 1); 331 if (!algo) 332 return -ENOSYS; 333 *props = algo->desc.sadb_alg_id; 334 335 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL); 336 if (!p) 337 return -ENOMEM; 338 339 strcpy(p->alg_name, algo->name); 340 p->alg_key_len = ualg->alg_key_len; 341 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; 342 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8); 343 344 *algpp = p; 345 return 0; 346 } 347 348 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props, 349 struct nlattr *rta) 350 { 351 struct xfrm_algo_auth *p, *ualg; 352 struct xfrm_algo_desc *algo; 353 354 if (!rta) 355 return 0; 356 357 ualg = nla_data(rta); 358 359 algo = xfrm_aalg_get_byname(ualg->alg_name, 1); 360 if (!algo) 361 return -ENOSYS; 362 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits) 363 return -EINVAL; 364 *props = algo->desc.sadb_alg_id; 365 366 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL); 367 if (!p) 368 return -ENOMEM; 369 370 strcpy(p->alg_name, algo->name); 371 if (!p->alg_trunc_len) 372 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; 373 374 *algpp = p; 375 return 0; 376 } 377 378 static int attach_aead(struct xfrm_state *x, struct nlattr *rta) 379 { 380 struct xfrm_algo_aead *p, *ualg; 381 struct xfrm_algo_desc *algo; 382 383 if (!rta) 384 return 0; 385 386 ualg = nla_data(rta); 387 388 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1); 389 if (!algo) 390 return -ENOSYS; 391 x->props.ealgo = algo->desc.sadb_alg_id; 392 393 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL); 394 if (!p) 395 return -ENOMEM; 396 397 strcpy(p->alg_name, algo->name); 398 x->aead = p; 399 x->geniv = algo->uinfo.aead.geniv; 400 return 0; 401 } 402 403 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn, 404 struct nlattr *rp) 405 { 406 struct xfrm_replay_state_esn *up; 407 int ulen; 408 409 if (!replay_esn || !rp) 410 return 0; 411 412 up = nla_data(rp); 413 ulen = xfrm_replay_state_esn_len(up); 414 415 /* Check the overall length and the internal bitmap length to avoid 416 * potential overflow. */ 417 if (nla_len(rp) < ulen || 418 xfrm_replay_state_esn_len(replay_esn) != ulen || 419 replay_esn->bmp_len != up->bmp_len) 420 return -EINVAL; 421 422 if (up->replay_window > up->bmp_len * sizeof(__u32) * 8) 423 return -EINVAL; 424 425 return 0; 426 } 427 428 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn, 429 struct xfrm_replay_state_esn **preplay_esn, 430 struct nlattr *rta) 431 { 432 struct xfrm_replay_state_esn *p, *pp, *up; 433 int klen, ulen; 434 435 if (!rta) 436 return 0; 437 438 up = nla_data(rta); 439 klen = xfrm_replay_state_esn_len(up); 440 ulen = nla_len(rta) >= klen ? klen : sizeof(*up); 441 442 p = kzalloc(klen, GFP_KERNEL); 443 if (!p) 444 return -ENOMEM; 445 446 pp = kzalloc(klen, GFP_KERNEL); 447 if (!pp) { 448 kfree(p); 449 return -ENOMEM; 450 } 451 452 memcpy(p, up, ulen); 453 memcpy(pp, up, ulen); 454 455 *replay_esn = p; 456 *preplay_esn = pp; 457 458 return 0; 459 } 460 461 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx) 462 { 463 int len = 0; 464 465 if (xfrm_ctx) { 466 len += sizeof(struct xfrm_user_sec_ctx); 467 len += xfrm_ctx->ctx_len; 468 } 469 return len; 470 } 471 472 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 473 { 474 memcpy(&x->id, &p->id, sizeof(x->id)); 475 memcpy(&x->sel, &p->sel, sizeof(x->sel)); 476 memcpy(&x->lft, &p->lft, sizeof(x->lft)); 477 x->props.mode = p->mode; 478 x->props.replay_window = min_t(unsigned int, p->replay_window, 479 sizeof(x->replay.bitmap) * 8); 480 x->props.reqid = p->reqid; 481 x->props.family = p->family; 482 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr)); 483 x->props.flags = p->flags; 484 485 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC)) 486 x->sel.family = p->family; 487 } 488 489 /* 490 * someday when pfkey also has support, we could have the code 491 * somehow made shareable and move it to xfrm_state.c - JHS 492 * 493 */ 494 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs, 495 int update_esn) 496 { 497 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 498 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL; 499 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 500 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; 501 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; 502 503 if (re) { 504 struct xfrm_replay_state_esn *replay_esn; 505 replay_esn = nla_data(re); 506 memcpy(x->replay_esn, replay_esn, 507 xfrm_replay_state_esn_len(replay_esn)); 508 memcpy(x->preplay_esn, replay_esn, 509 xfrm_replay_state_esn_len(replay_esn)); 510 } 511 512 if (rp) { 513 struct xfrm_replay_state *replay; 514 replay = nla_data(rp); 515 memcpy(&x->replay, replay, sizeof(*replay)); 516 memcpy(&x->preplay, replay, sizeof(*replay)); 517 } 518 519 if (lt) { 520 struct xfrm_lifetime_cur *ltime; 521 ltime = nla_data(lt); 522 x->curlft.bytes = ltime->bytes; 523 x->curlft.packets = ltime->packets; 524 x->curlft.add_time = ltime->add_time; 525 x->curlft.use_time = ltime->use_time; 526 } 527 528 if (et) 529 x->replay_maxage = nla_get_u32(et); 530 531 if (rt) 532 x->replay_maxdiff = nla_get_u32(rt); 533 } 534 535 static struct xfrm_state *xfrm_state_construct(struct net *net, 536 struct xfrm_usersa_info *p, 537 struct nlattr **attrs, 538 int *errp) 539 { 540 struct xfrm_state *x = xfrm_state_alloc(net); 541 int err = -ENOMEM; 542 543 if (!x) 544 goto error_no_put; 545 546 copy_from_user_state(x, p); 547 548 if (attrs[XFRMA_SA_EXTRA_FLAGS]) 549 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]); 550 551 if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD]))) 552 goto error; 553 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo, 554 attrs[XFRMA_ALG_AUTH_TRUNC]))) 555 goto error; 556 if (!x->props.aalgo) { 557 if ((err = attach_auth(&x->aalg, &x->props.aalgo, 558 attrs[XFRMA_ALG_AUTH]))) 559 goto error; 560 } 561 if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT]))) 562 goto error; 563 if ((err = attach_one_algo(&x->calg, &x->props.calgo, 564 xfrm_calg_get_byname, 565 attrs[XFRMA_ALG_COMP]))) 566 goto error; 567 568 if (attrs[XFRMA_ENCAP]) { 569 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]), 570 sizeof(*x->encap), GFP_KERNEL); 571 if (x->encap == NULL) 572 goto error; 573 } 574 575 if (attrs[XFRMA_TFCPAD]) 576 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]); 577 578 if (attrs[XFRMA_COADDR]) { 579 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]), 580 sizeof(*x->coaddr), GFP_KERNEL); 581 if (x->coaddr == NULL) 582 goto error; 583 } 584 585 xfrm_mark_get(attrs, &x->mark); 586 587 err = __xfrm_init_state(x, false); 588 if (err) 589 goto error; 590 591 if (attrs[XFRMA_SEC_CTX]) { 592 err = security_xfrm_state_alloc(x, 593 nla_data(attrs[XFRMA_SEC_CTX])); 594 if (err) 595 goto error; 596 } 597 598 if (attrs[XFRMA_OFFLOAD_DEV] && 599 xfrm_dev_state_add(net, x, nla_data(attrs[XFRMA_OFFLOAD_DEV]))) 600 goto error; 601 602 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn, 603 attrs[XFRMA_REPLAY_ESN_VAL]))) 604 goto error; 605 606 x->km.seq = p->seq; 607 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth; 608 /* sysctl_xfrm_aevent_etime is in 100ms units */ 609 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M; 610 611 if ((err = xfrm_init_replay(x))) 612 goto error; 613 614 /* override default values from above */ 615 xfrm_update_ae_params(x, attrs, 0); 616 617 return x; 618 619 error: 620 x->km.state = XFRM_STATE_DEAD; 621 xfrm_state_put(x); 622 error_no_put: 623 *errp = err; 624 return NULL; 625 } 626 627 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 628 struct nlattr **attrs) 629 { 630 struct net *net = sock_net(skb->sk); 631 struct xfrm_usersa_info *p = nlmsg_data(nlh); 632 struct xfrm_state *x; 633 int err; 634 struct km_event c; 635 636 err = verify_newsa_info(p, attrs); 637 if (err) 638 return err; 639 640 x = xfrm_state_construct(net, p, attrs, &err); 641 if (!x) 642 return err; 643 644 xfrm_state_hold(x); 645 if (nlh->nlmsg_type == XFRM_MSG_NEWSA) 646 err = xfrm_state_add(x); 647 else 648 err = xfrm_state_update(x); 649 650 xfrm_audit_state_add(x, err ? 0 : 1, true); 651 652 if (err < 0) { 653 x->km.state = XFRM_STATE_DEAD; 654 __xfrm_state_put(x); 655 goto out; 656 } 657 658 c.seq = nlh->nlmsg_seq; 659 c.portid = nlh->nlmsg_pid; 660 c.event = nlh->nlmsg_type; 661 662 km_state_notify(x, &c); 663 out: 664 xfrm_state_put(x); 665 return err; 666 } 667 668 static struct xfrm_state *xfrm_user_state_lookup(struct net *net, 669 struct xfrm_usersa_id *p, 670 struct nlattr **attrs, 671 int *errp) 672 { 673 struct xfrm_state *x = NULL; 674 struct xfrm_mark m; 675 int err; 676 u32 mark = xfrm_mark_get(attrs, &m); 677 678 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) { 679 err = -ESRCH; 680 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family); 681 } else { 682 xfrm_address_t *saddr = NULL; 683 684 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr); 685 if (!saddr) { 686 err = -EINVAL; 687 goto out; 688 } 689 690 err = -ESRCH; 691 x = xfrm_state_lookup_byaddr(net, mark, 692 &p->daddr, saddr, 693 p->proto, p->family); 694 } 695 696 out: 697 if (!x && errp) 698 *errp = err; 699 return x; 700 } 701 702 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 703 struct nlattr **attrs) 704 { 705 struct net *net = sock_net(skb->sk); 706 struct xfrm_state *x; 707 int err = -ESRCH; 708 struct km_event c; 709 struct xfrm_usersa_id *p = nlmsg_data(nlh); 710 711 x = xfrm_user_state_lookup(net, p, attrs, &err); 712 if (x == NULL) 713 return err; 714 715 if ((err = security_xfrm_state_delete(x)) != 0) 716 goto out; 717 718 if (xfrm_state_kern(x)) { 719 err = -EPERM; 720 goto out; 721 } 722 723 err = xfrm_state_delete(x); 724 725 if (err < 0) 726 goto out; 727 728 c.seq = nlh->nlmsg_seq; 729 c.portid = nlh->nlmsg_pid; 730 c.event = nlh->nlmsg_type; 731 km_state_notify(x, &c); 732 733 out: 734 xfrm_audit_state_delete(x, err ? 0 : 1, true); 735 xfrm_state_put(x); 736 return err; 737 } 738 739 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 740 { 741 memset(p, 0, sizeof(*p)); 742 memcpy(&p->id, &x->id, sizeof(p->id)); 743 memcpy(&p->sel, &x->sel, sizeof(p->sel)); 744 memcpy(&p->lft, &x->lft, sizeof(p->lft)); 745 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft)); 746 put_unaligned(x->stats.replay_window, &p->stats.replay_window); 747 put_unaligned(x->stats.replay, &p->stats.replay); 748 put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed); 749 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr)); 750 p->mode = x->props.mode; 751 p->replay_window = x->props.replay_window; 752 p->reqid = x->props.reqid; 753 p->family = x->props.family; 754 p->flags = x->props.flags; 755 p->seq = x->km.seq; 756 } 757 758 struct xfrm_dump_info { 759 struct sk_buff *in_skb; 760 struct sk_buff *out_skb; 761 u32 nlmsg_seq; 762 u16 nlmsg_flags; 763 }; 764 765 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb) 766 { 767 struct xfrm_user_sec_ctx *uctx; 768 struct nlattr *attr; 769 int ctx_size = sizeof(*uctx) + s->ctx_len; 770 771 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size); 772 if (attr == NULL) 773 return -EMSGSIZE; 774 775 uctx = nla_data(attr); 776 uctx->exttype = XFRMA_SEC_CTX; 777 uctx->len = ctx_size; 778 uctx->ctx_doi = s->ctx_doi; 779 uctx->ctx_alg = s->ctx_alg; 780 uctx->ctx_len = s->ctx_len; 781 memcpy(uctx + 1, s->ctx_str, s->ctx_len); 782 783 return 0; 784 } 785 786 static int copy_user_offload(struct xfrm_state_offload *xso, struct sk_buff *skb) 787 { 788 struct xfrm_user_offload *xuo; 789 struct nlattr *attr; 790 791 attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo)); 792 if (attr == NULL) 793 return -EMSGSIZE; 794 795 xuo = nla_data(attr); 796 797 xuo->ifindex = xso->dev->ifindex; 798 xuo->flags = xso->flags; 799 800 return 0; 801 } 802 803 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb) 804 { 805 struct xfrm_algo *algo; 806 struct nlattr *nla; 807 808 nla = nla_reserve(skb, XFRMA_ALG_AUTH, 809 sizeof(*algo) + (auth->alg_key_len + 7) / 8); 810 if (!nla) 811 return -EMSGSIZE; 812 813 algo = nla_data(nla); 814 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name)); 815 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8); 816 algo->alg_key_len = auth->alg_key_len; 817 818 return 0; 819 } 820 821 /* Don't change this without updating xfrm_sa_len! */ 822 static int copy_to_user_state_extra(struct xfrm_state *x, 823 struct xfrm_usersa_info *p, 824 struct sk_buff *skb) 825 { 826 int ret = 0; 827 828 copy_to_user_state(x, p); 829 830 if (x->props.extra_flags) { 831 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS, 832 x->props.extra_flags); 833 if (ret) 834 goto out; 835 } 836 837 if (x->coaddr) { 838 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr); 839 if (ret) 840 goto out; 841 } 842 if (x->lastused) { 843 ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused, 844 XFRMA_PAD); 845 if (ret) 846 goto out; 847 } 848 if (x->aead) { 849 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead); 850 if (ret) 851 goto out; 852 } 853 if (x->aalg) { 854 ret = copy_to_user_auth(x->aalg, skb); 855 if (!ret) 856 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC, 857 xfrm_alg_auth_len(x->aalg), x->aalg); 858 if (ret) 859 goto out; 860 } 861 if (x->ealg) { 862 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg); 863 if (ret) 864 goto out; 865 } 866 if (x->calg) { 867 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg); 868 if (ret) 869 goto out; 870 } 871 if (x->encap) { 872 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap); 873 if (ret) 874 goto out; 875 } 876 if (x->tfcpad) { 877 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad); 878 if (ret) 879 goto out; 880 } 881 ret = xfrm_mark_put(skb, &x->mark); 882 if (ret) 883 goto out; 884 if (x->replay_esn) 885 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL, 886 xfrm_replay_state_esn_len(x->replay_esn), 887 x->replay_esn); 888 else 889 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), 890 &x->replay); 891 if (ret) 892 goto out; 893 if(x->xso.dev) 894 ret = copy_user_offload(&x->xso, skb); 895 if (ret) 896 goto out; 897 if (x->security) 898 ret = copy_sec_ctx(x->security, skb); 899 out: 900 return ret; 901 } 902 903 static int dump_one_state(struct xfrm_state *x, int count, void *ptr) 904 { 905 struct xfrm_dump_info *sp = ptr; 906 struct sk_buff *in_skb = sp->in_skb; 907 struct sk_buff *skb = sp->out_skb; 908 struct xfrm_usersa_info *p; 909 struct nlmsghdr *nlh; 910 int err; 911 912 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, 913 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags); 914 if (nlh == NULL) 915 return -EMSGSIZE; 916 917 p = nlmsg_data(nlh); 918 919 err = copy_to_user_state_extra(x, p, skb); 920 if (err) { 921 nlmsg_cancel(skb, nlh); 922 return err; 923 } 924 nlmsg_end(skb, nlh); 925 return 0; 926 } 927 928 static int xfrm_dump_sa_done(struct netlink_callback *cb) 929 { 930 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 931 struct sock *sk = cb->skb->sk; 932 struct net *net = sock_net(sk); 933 934 if (cb->args[0]) 935 xfrm_state_walk_done(walk, net); 936 return 0; 937 } 938 939 static const struct nla_policy xfrma_policy[XFRMA_MAX+1]; 940 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb) 941 { 942 struct net *net = sock_net(skb->sk); 943 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 944 struct xfrm_dump_info info; 945 946 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) > 947 sizeof(cb->args) - sizeof(cb->args[0])); 948 949 info.in_skb = cb->skb; 950 info.out_skb = skb; 951 info.nlmsg_seq = cb->nlh->nlmsg_seq; 952 info.nlmsg_flags = NLM_F_MULTI; 953 954 if (!cb->args[0]) { 955 struct nlattr *attrs[XFRMA_MAX+1]; 956 struct xfrm_address_filter *filter = NULL; 957 u8 proto = 0; 958 int err; 959 960 err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX, 961 xfrma_policy); 962 if (err < 0) 963 return err; 964 965 if (attrs[XFRMA_ADDRESS_FILTER]) { 966 filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]), 967 sizeof(*filter), GFP_KERNEL); 968 if (filter == NULL) 969 return -ENOMEM; 970 } 971 972 if (attrs[XFRMA_PROTO]) 973 proto = nla_get_u8(attrs[XFRMA_PROTO]); 974 975 xfrm_state_walk_init(walk, proto, filter); 976 cb->args[0] = 1; 977 } 978 979 (void) xfrm_state_walk(net, walk, dump_one_state, &info); 980 981 return skb->len; 982 } 983 984 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb, 985 struct xfrm_state *x, u32 seq) 986 { 987 struct xfrm_dump_info info; 988 struct sk_buff *skb; 989 int err; 990 991 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 992 if (!skb) 993 return ERR_PTR(-ENOMEM); 994 995 info.in_skb = in_skb; 996 info.out_skb = skb; 997 info.nlmsg_seq = seq; 998 info.nlmsg_flags = 0; 999 1000 err = dump_one_state(x, 0, &info); 1001 if (err) { 1002 kfree_skb(skb); 1003 return ERR_PTR(err); 1004 } 1005 1006 return skb; 1007 } 1008 1009 /* A wrapper for nlmsg_multicast() checking that nlsk is still available. 1010 * Must be called with RCU read lock. 1011 */ 1012 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb, 1013 u32 pid, unsigned int group) 1014 { 1015 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk); 1016 1017 if (nlsk) 1018 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC); 1019 else 1020 return -1; 1021 } 1022 1023 static inline size_t xfrm_spdinfo_msgsize(void) 1024 { 1025 return NLMSG_ALIGN(4) 1026 + nla_total_size(sizeof(struct xfrmu_spdinfo)) 1027 + nla_total_size(sizeof(struct xfrmu_spdhinfo)) 1028 + nla_total_size(sizeof(struct xfrmu_spdhthresh)) 1029 + nla_total_size(sizeof(struct xfrmu_spdhthresh)); 1030 } 1031 1032 static int build_spdinfo(struct sk_buff *skb, struct net *net, 1033 u32 portid, u32 seq, u32 flags) 1034 { 1035 struct xfrmk_spdinfo si; 1036 struct xfrmu_spdinfo spc; 1037 struct xfrmu_spdhinfo sph; 1038 struct xfrmu_spdhthresh spt4, spt6; 1039 struct nlmsghdr *nlh; 1040 int err; 1041 u32 *f; 1042 unsigned lseq; 1043 1044 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0); 1045 if (nlh == NULL) /* shouldn't really happen ... */ 1046 return -EMSGSIZE; 1047 1048 f = nlmsg_data(nlh); 1049 *f = flags; 1050 xfrm_spd_getinfo(net, &si); 1051 spc.incnt = si.incnt; 1052 spc.outcnt = si.outcnt; 1053 spc.fwdcnt = si.fwdcnt; 1054 spc.inscnt = si.inscnt; 1055 spc.outscnt = si.outscnt; 1056 spc.fwdscnt = si.fwdscnt; 1057 sph.spdhcnt = si.spdhcnt; 1058 sph.spdhmcnt = si.spdhmcnt; 1059 1060 do { 1061 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock); 1062 1063 spt4.lbits = net->xfrm.policy_hthresh.lbits4; 1064 spt4.rbits = net->xfrm.policy_hthresh.rbits4; 1065 spt6.lbits = net->xfrm.policy_hthresh.lbits6; 1066 spt6.rbits = net->xfrm.policy_hthresh.rbits6; 1067 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq)); 1068 1069 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc); 1070 if (!err) 1071 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph); 1072 if (!err) 1073 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4); 1074 if (!err) 1075 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6); 1076 if (err) { 1077 nlmsg_cancel(skb, nlh); 1078 return err; 1079 } 1080 1081 nlmsg_end(skb, nlh); 1082 return 0; 1083 } 1084 1085 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1086 struct nlattr **attrs) 1087 { 1088 struct net *net = sock_net(skb->sk); 1089 struct xfrmu_spdhthresh *thresh4 = NULL; 1090 struct xfrmu_spdhthresh *thresh6 = NULL; 1091 1092 /* selector prefixlen thresholds to hash policies */ 1093 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) { 1094 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH]; 1095 1096 if (nla_len(rta) < sizeof(*thresh4)) 1097 return -EINVAL; 1098 thresh4 = nla_data(rta); 1099 if (thresh4->lbits > 32 || thresh4->rbits > 32) 1100 return -EINVAL; 1101 } 1102 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) { 1103 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH]; 1104 1105 if (nla_len(rta) < sizeof(*thresh6)) 1106 return -EINVAL; 1107 thresh6 = nla_data(rta); 1108 if (thresh6->lbits > 128 || thresh6->rbits > 128) 1109 return -EINVAL; 1110 } 1111 1112 if (thresh4 || thresh6) { 1113 write_seqlock(&net->xfrm.policy_hthresh.lock); 1114 if (thresh4) { 1115 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits; 1116 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits; 1117 } 1118 if (thresh6) { 1119 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits; 1120 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits; 1121 } 1122 write_sequnlock(&net->xfrm.policy_hthresh.lock); 1123 1124 xfrm_policy_hash_rebuild(net); 1125 } 1126 1127 return 0; 1128 } 1129 1130 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1131 struct nlattr **attrs) 1132 { 1133 struct net *net = sock_net(skb->sk); 1134 struct sk_buff *r_skb; 1135 u32 *flags = nlmsg_data(nlh); 1136 u32 sportid = NETLINK_CB(skb).portid; 1137 u32 seq = nlh->nlmsg_seq; 1138 1139 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC); 1140 if (r_skb == NULL) 1141 return -ENOMEM; 1142 1143 if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0) 1144 BUG(); 1145 1146 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); 1147 } 1148 1149 static inline size_t xfrm_sadinfo_msgsize(void) 1150 { 1151 return NLMSG_ALIGN(4) 1152 + nla_total_size(sizeof(struct xfrmu_sadhinfo)) 1153 + nla_total_size(4); /* XFRMA_SAD_CNT */ 1154 } 1155 1156 static int build_sadinfo(struct sk_buff *skb, struct net *net, 1157 u32 portid, u32 seq, u32 flags) 1158 { 1159 struct xfrmk_sadinfo si; 1160 struct xfrmu_sadhinfo sh; 1161 struct nlmsghdr *nlh; 1162 int err; 1163 u32 *f; 1164 1165 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0); 1166 if (nlh == NULL) /* shouldn't really happen ... */ 1167 return -EMSGSIZE; 1168 1169 f = nlmsg_data(nlh); 1170 *f = flags; 1171 xfrm_sad_getinfo(net, &si); 1172 1173 sh.sadhmcnt = si.sadhmcnt; 1174 sh.sadhcnt = si.sadhcnt; 1175 1176 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt); 1177 if (!err) 1178 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh); 1179 if (err) { 1180 nlmsg_cancel(skb, nlh); 1181 return err; 1182 } 1183 1184 nlmsg_end(skb, nlh); 1185 return 0; 1186 } 1187 1188 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1189 struct nlattr **attrs) 1190 { 1191 struct net *net = sock_net(skb->sk); 1192 struct sk_buff *r_skb; 1193 u32 *flags = nlmsg_data(nlh); 1194 u32 sportid = NETLINK_CB(skb).portid; 1195 u32 seq = nlh->nlmsg_seq; 1196 1197 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC); 1198 if (r_skb == NULL) 1199 return -ENOMEM; 1200 1201 if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0) 1202 BUG(); 1203 1204 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); 1205 } 1206 1207 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 1208 struct nlattr **attrs) 1209 { 1210 struct net *net = sock_net(skb->sk); 1211 struct xfrm_usersa_id *p = nlmsg_data(nlh); 1212 struct xfrm_state *x; 1213 struct sk_buff *resp_skb; 1214 int err = -ESRCH; 1215 1216 x = xfrm_user_state_lookup(net, p, attrs, &err); 1217 if (x == NULL) 1218 goto out_noput; 1219 1220 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 1221 if (IS_ERR(resp_skb)) { 1222 err = PTR_ERR(resp_skb); 1223 } else { 1224 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); 1225 } 1226 xfrm_state_put(x); 1227 out_noput: 1228 return err; 1229 } 1230 1231 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, 1232 struct nlattr **attrs) 1233 { 1234 struct net *net = sock_net(skb->sk); 1235 struct xfrm_state *x; 1236 struct xfrm_userspi_info *p; 1237 struct sk_buff *resp_skb; 1238 xfrm_address_t *daddr; 1239 int family; 1240 int err; 1241 u32 mark; 1242 struct xfrm_mark m; 1243 1244 p = nlmsg_data(nlh); 1245 err = verify_spi_info(p->info.id.proto, p->min, p->max); 1246 if (err) 1247 goto out_noput; 1248 1249 family = p->info.family; 1250 daddr = &p->info.id.daddr; 1251 1252 x = NULL; 1253 1254 mark = xfrm_mark_get(attrs, &m); 1255 if (p->info.seq) { 1256 x = xfrm_find_acq_byseq(net, mark, p->info.seq); 1257 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) { 1258 xfrm_state_put(x); 1259 x = NULL; 1260 } 1261 } 1262 1263 if (!x) 1264 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid, 1265 p->info.id.proto, daddr, 1266 &p->info.saddr, 1, 1267 family); 1268 err = -ENOENT; 1269 if (x == NULL) 1270 goto out_noput; 1271 1272 err = xfrm_alloc_spi(x, p->min, p->max); 1273 if (err) 1274 goto out; 1275 1276 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 1277 if (IS_ERR(resp_skb)) { 1278 err = PTR_ERR(resp_skb); 1279 goto out; 1280 } 1281 1282 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); 1283 1284 out: 1285 xfrm_state_put(x); 1286 out_noput: 1287 return err; 1288 } 1289 1290 static int verify_policy_dir(u8 dir) 1291 { 1292 switch (dir) { 1293 case XFRM_POLICY_IN: 1294 case XFRM_POLICY_OUT: 1295 case XFRM_POLICY_FWD: 1296 break; 1297 1298 default: 1299 return -EINVAL; 1300 } 1301 1302 return 0; 1303 } 1304 1305 static int verify_policy_type(u8 type) 1306 { 1307 switch (type) { 1308 case XFRM_POLICY_TYPE_MAIN: 1309 #ifdef CONFIG_XFRM_SUB_POLICY 1310 case XFRM_POLICY_TYPE_SUB: 1311 #endif 1312 break; 1313 1314 default: 1315 return -EINVAL; 1316 } 1317 1318 return 0; 1319 } 1320 1321 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p) 1322 { 1323 int ret; 1324 1325 switch (p->share) { 1326 case XFRM_SHARE_ANY: 1327 case XFRM_SHARE_SESSION: 1328 case XFRM_SHARE_USER: 1329 case XFRM_SHARE_UNIQUE: 1330 break; 1331 1332 default: 1333 return -EINVAL; 1334 } 1335 1336 switch (p->action) { 1337 case XFRM_POLICY_ALLOW: 1338 case XFRM_POLICY_BLOCK: 1339 break; 1340 1341 default: 1342 return -EINVAL; 1343 } 1344 1345 switch (p->sel.family) { 1346 case AF_INET: 1347 break; 1348 1349 case AF_INET6: 1350 #if IS_ENABLED(CONFIG_IPV6) 1351 break; 1352 #else 1353 return -EAFNOSUPPORT; 1354 #endif 1355 1356 default: 1357 return -EINVAL; 1358 } 1359 1360 ret = verify_policy_dir(p->dir); 1361 if (ret) 1362 return ret; 1363 if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir)) 1364 return -EINVAL; 1365 1366 return 0; 1367 } 1368 1369 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs) 1370 { 1371 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1372 struct xfrm_user_sec_ctx *uctx; 1373 1374 if (!rt) 1375 return 0; 1376 1377 uctx = nla_data(rt); 1378 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL); 1379 } 1380 1381 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut, 1382 int nr) 1383 { 1384 int i; 1385 1386 xp->xfrm_nr = nr; 1387 for (i = 0; i < nr; i++, ut++) { 1388 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 1389 1390 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id)); 1391 memcpy(&t->saddr, &ut->saddr, 1392 sizeof(xfrm_address_t)); 1393 t->reqid = ut->reqid; 1394 t->mode = ut->mode; 1395 t->share = ut->share; 1396 t->optional = ut->optional; 1397 t->aalgos = ut->aalgos; 1398 t->ealgos = ut->ealgos; 1399 t->calgos = ut->calgos; 1400 /* If all masks are ~0, then we allow all algorithms. */ 1401 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos); 1402 t->encap_family = ut->family; 1403 } 1404 } 1405 1406 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family) 1407 { 1408 int i; 1409 1410 if (nr > XFRM_MAX_DEPTH) 1411 return -EINVAL; 1412 1413 for (i = 0; i < nr; i++) { 1414 /* We never validated the ut->family value, so many 1415 * applications simply leave it at zero. The check was 1416 * never made and ut->family was ignored because all 1417 * templates could be assumed to have the same family as 1418 * the policy itself. Now that we will have ipv4-in-ipv6 1419 * and ipv6-in-ipv4 tunnels, this is no longer true. 1420 */ 1421 if (!ut[i].family) 1422 ut[i].family = family; 1423 1424 switch (ut[i].family) { 1425 case AF_INET: 1426 break; 1427 #if IS_ENABLED(CONFIG_IPV6) 1428 case AF_INET6: 1429 break; 1430 #endif 1431 default: 1432 return -EINVAL; 1433 } 1434 } 1435 1436 return 0; 1437 } 1438 1439 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs) 1440 { 1441 struct nlattr *rt = attrs[XFRMA_TMPL]; 1442 1443 if (!rt) { 1444 pol->xfrm_nr = 0; 1445 } else { 1446 struct xfrm_user_tmpl *utmpl = nla_data(rt); 1447 int nr = nla_len(rt) / sizeof(*utmpl); 1448 int err; 1449 1450 err = validate_tmpl(nr, utmpl, pol->family); 1451 if (err) 1452 return err; 1453 1454 copy_templates(pol, utmpl, nr); 1455 } 1456 return 0; 1457 } 1458 1459 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs) 1460 { 1461 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE]; 1462 struct xfrm_userpolicy_type *upt; 1463 u8 type = XFRM_POLICY_TYPE_MAIN; 1464 int err; 1465 1466 if (rt) { 1467 upt = nla_data(rt); 1468 type = upt->type; 1469 } 1470 1471 err = verify_policy_type(type); 1472 if (err) 1473 return err; 1474 1475 *tp = type; 1476 return 0; 1477 } 1478 1479 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p) 1480 { 1481 xp->priority = p->priority; 1482 xp->index = p->index; 1483 memcpy(&xp->selector, &p->sel, sizeof(xp->selector)); 1484 memcpy(&xp->lft, &p->lft, sizeof(xp->lft)); 1485 xp->action = p->action; 1486 xp->flags = p->flags; 1487 xp->family = p->sel.family; 1488 /* XXX xp->share = p->share; */ 1489 } 1490 1491 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir) 1492 { 1493 memset(p, 0, sizeof(*p)); 1494 memcpy(&p->sel, &xp->selector, sizeof(p->sel)); 1495 memcpy(&p->lft, &xp->lft, sizeof(p->lft)); 1496 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft)); 1497 p->priority = xp->priority; 1498 p->index = xp->index; 1499 p->sel.family = xp->family; 1500 p->dir = dir; 1501 p->action = xp->action; 1502 p->flags = xp->flags; 1503 p->share = XFRM_SHARE_ANY; /* XXX xp->share */ 1504 } 1505 1506 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp) 1507 { 1508 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL); 1509 int err; 1510 1511 if (!xp) { 1512 *errp = -ENOMEM; 1513 return NULL; 1514 } 1515 1516 copy_from_user_policy(xp, p); 1517 1518 err = copy_from_user_policy_type(&xp->type, attrs); 1519 if (err) 1520 goto error; 1521 1522 if (!(err = copy_from_user_tmpl(xp, attrs))) 1523 err = copy_from_user_sec_ctx(xp, attrs); 1524 if (err) 1525 goto error; 1526 1527 xfrm_mark_get(attrs, &xp->mark); 1528 1529 return xp; 1530 error: 1531 *errp = err; 1532 xp->walk.dead = 1; 1533 xfrm_policy_destroy(xp); 1534 return NULL; 1535 } 1536 1537 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1538 struct nlattr **attrs) 1539 { 1540 struct net *net = sock_net(skb->sk); 1541 struct xfrm_userpolicy_info *p = nlmsg_data(nlh); 1542 struct xfrm_policy *xp; 1543 struct km_event c; 1544 int err; 1545 int excl; 1546 1547 err = verify_newpolicy_info(p); 1548 if (err) 1549 return err; 1550 err = verify_sec_ctx_len(attrs); 1551 if (err) 1552 return err; 1553 1554 xp = xfrm_policy_construct(net, p, attrs, &err); 1555 if (!xp) 1556 return err; 1557 1558 /* shouldn't excl be based on nlh flags?? 1559 * Aha! this is anti-netlink really i.e more pfkey derived 1560 * in netlink excl is a flag and you wouldnt need 1561 * a type XFRM_MSG_UPDPOLICY - JHS */ 1562 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY; 1563 err = xfrm_policy_insert(p->dir, xp, excl); 1564 xfrm_audit_policy_add(xp, err ? 0 : 1, true); 1565 1566 if (err) { 1567 security_xfrm_policy_free(xp->security); 1568 kfree(xp); 1569 return err; 1570 } 1571 1572 c.event = nlh->nlmsg_type; 1573 c.seq = nlh->nlmsg_seq; 1574 c.portid = nlh->nlmsg_pid; 1575 km_policy_notify(xp, p->dir, &c); 1576 1577 xfrm_pol_put(xp); 1578 1579 return 0; 1580 } 1581 1582 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb) 1583 { 1584 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH]; 1585 int i; 1586 1587 if (xp->xfrm_nr == 0) 1588 return 0; 1589 1590 for (i = 0; i < xp->xfrm_nr; i++) { 1591 struct xfrm_user_tmpl *up = &vec[i]; 1592 struct xfrm_tmpl *kp = &xp->xfrm_vec[i]; 1593 1594 memset(up, 0, sizeof(*up)); 1595 memcpy(&up->id, &kp->id, sizeof(up->id)); 1596 up->family = kp->encap_family; 1597 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr)); 1598 up->reqid = kp->reqid; 1599 up->mode = kp->mode; 1600 up->share = kp->share; 1601 up->optional = kp->optional; 1602 up->aalgos = kp->aalgos; 1603 up->ealgos = kp->ealgos; 1604 up->calgos = kp->calgos; 1605 } 1606 1607 return nla_put(skb, XFRMA_TMPL, 1608 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec); 1609 } 1610 1611 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb) 1612 { 1613 if (x->security) { 1614 return copy_sec_ctx(x->security, skb); 1615 } 1616 return 0; 1617 } 1618 1619 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb) 1620 { 1621 if (xp->security) 1622 return copy_sec_ctx(xp->security, skb); 1623 return 0; 1624 } 1625 static inline size_t userpolicy_type_attrsize(void) 1626 { 1627 #ifdef CONFIG_XFRM_SUB_POLICY 1628 return nla_total_size(sizeof(struct xfrm_userpolicy_type)); 1629 #else 1630 return 0; 1631 #endif 1632 } 1633 1634 #ifdef CONFIG_XFRM_SUB_POLICY 1635 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1636 { 1637 struct xfrm_userpolicy_type upt = { 1638 .type = type, 1639 }; 1640 1641 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt); 1642 } 1643 1644 #else 1645 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1646 { 1647 return 0; 1648 } 1649 #endif 1650 1651 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr) 1652 { 1653 struct xfrm_dump_info *sp = ptr; 1654 struct xfrm_userpolicy_info *p; 1655 struct sk_buff *in_skb = sp->in_skb; 1656 struct sk_buff *skb = sp->out_skb; 1657 struct nlmsghdr *nlh; 1658 int err; 1659 1660 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, 1661 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags); 1662 if (nlh == NULL) 1663 return -EMSGSIZE; 1664 1665 p = nlmsg_data(nlh); 1666 copy_to_user_policy(xp, p, dir); 1667 err = copy_to_user_tmpl(xp, skb); 1668 if (!err) 1669 err = copy_to_user_sec_ctx(xp, skb); 1670 if (!err) 1671 err = copy_to_user_policy_type(xp->type, skb); 1672 if (!err) 1673 err = xfrm_mark_put(skb, &xp->mark); 1674 if (err) { 1675 nlmsg_cancel(skb, nlh); 1676 return err; 1677 } 1678 nlmsg_end(skb, nlh); 1679 return 0; 1680 } 1681 1682 static int xfrm_dump_policy_done(struct netlink_callback *cb) 1683 { 1684 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1]; 1685 struct net *net = sock_net(cb->skb->sk); 1686 1687 xfrm_policy_walk_done(walk, net); 1688 return 0; 1689 } 1690 1691 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb) 1692 { 1693 struct net *net = sock_net(skb->sk); 1694 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1]; 1695 struct xfrm_dump_info info; 1696 1697 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) > 1698 sizeof(cb->args) - sizeof(cb->args[0])); 1699 1700 info.in_skb = cb->skb; 1701 info.out_skb = skb; 1702 info.nlmsg_seq = cb->nlh->nlmsg_seq; 1703 info.nlmsg_flags = NLM_F_MULTI; 1704 1705 if (!cb->args[0]) { 1706 cb->args[0] = 1; 1707 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY); 1708 } 1709 1710 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info); 1711 1712 return skb->len; 1713 } 1714 1715 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb, 1716 struct xfrm_policy *xp, 1717 int dir, u32 seq) 1718 { 1719 struct xfrm_dump_info info; 1720 struct sk_buff *skb; 1721 int err; 1722 1723 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1724 if (!skb) 1725 return ERR_PTR(-ENOMEM); 1726 1727 info.in_skb = in_skb; 1728 info.out_skb = skb; 1729 info.nlmsg_seq = seq; 1730 info.nlmsg_flags = 0; 1731 1732 err = dump_one_policy(xp, dir, 0, &info); 1733 if (err) { 1734 kfree_skb(skb); 1735 return ERR_PTR(err); 1736 } 1737 1738 return skb; 1739 } 1740 1741 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1742 struct nlattr **attrs) 1743 { 1744 struct net *net = sock_net(skb->sk); 1745 struct xfrm_policy *xp; 1746 struct xfrm_userpolicy_id *p; 1747 u8 type = XFRM_POLICY_TYPE_MAIN; 1748 int err; 1749 struct km_event c; 1750 int delete; 1751 struct xfrm_mark m; 1752 u32 mark = xfrm_mark_get(attrs, &m); 1753 1754 p = nlmsg_data(nlh); 1755 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY; 1756 1757 err = copy_from_user_policy_type(&type, attrs); 1758 if (err) 1759 return err; 1760 1761 err = verify_policy_dir(p->dir); 1762 if (err) 1763 return err; 1764 1765 if (p->index) 1766 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err); 1767 else { 1768 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1769 struct xfrm_sec_ctx *ctx; 1770 1771 err = verify_sec_ctx_len(attrs); 1772 if (err) 1773 return err; 1774 1775 ctx = NULL; 1776 if (rt) { 1777 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 1778 1779 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); 1780 if (err) 1781 return err; 1782 } 1783 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel, 1784 ctx, delete, &err); 1785 security_xfrm_policy_free(ctx); 1786 } 1787 if (xp == NULL) 1788 return -ENOENT; 1789 1790 if (!delete) { 1791 struct sk_buff *resp_skb; 1792 1793 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq); 1794 if (IS_ERR(resp_skb)) { 1795 err = PTR_ERR(resp_skb); 1796 } else { 1797 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, 1798 NETLINK_CB(skb).portid); 1799 } 1800 } else { 1801 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 1802 1803 if (err != 0) 1804 goto out; 1805 1806 c.data.byid = p->index; 1807 c.event = nlh->nlmsg_type; 1808 c.seq = nlh->nlmsg_seq; 1809 c.portid = nlh->nlmsg_pid; 1810 km_policy_notify(xp, p->dir, &c); 1811 } 1812 1813 out: 1814 xfrm_pol_put(xp); 1815 if (delete && err == 0) 1816 xfrm_garbage_collect(net); 1817 return err; 1818 } 1819 1820 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 1821 struct nlattr **attrs) 1822 { 1823 struct net *net = sock_net(skb->sk); 1824 struct km_event c; 1825 struct xfrm_usersa_flush *p = nlmsg_data(nlh); 1826 int err; 1827 1828 err = xfrm_state_flush(net, p->proto, true); 1829 if (err) { 1830 if (err == -ESRCH) /* empty table */ 1831 return 0; 1832 return err; 1833 } 1834 c.data.proto = p->proto; 1835 c.event = nlh->nlmsg_type; 1836 c.seq = nlh->nlmsg_seq; 1837 c.portid = nlh->nlmsg_pid; 1838 c.net = net; 1839 km_state_notify(NULL, &c); 1840 1841 return 0; 1842 } 1843 1844 static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x) 1845 { 1846 size_t replay_size = x->replay_esn ? 1847 xfrm_replay_state_esn_len(x->replay_esn) : 1848 sizeof(struct xfrm_replay_state); 1849 1850 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id)) 1851 + nla_total_size(replay_size) 1852 + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur)) 1853 + nla_total_size(sizeof(struct xfrm_mark)) 1854 + nla_total_size(4) /* XFRM_AE_RTHR */ 1855 + nla_total_size(4); /* XFRM_AE_ETHR */ 1856 } 1857 1858 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 1859 { 1860 struct xfrm_aevent_id *id; 1861 struct nlmsghdr *nlh; 1862 int err; 1863 1864 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0); 1865 if (nlh == NULL) 1866 return -EMSGSIZE; 1867 1868 id = nlmsg_data(nlh); 1869 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr)); 1870 id->sa_id.spi = x->id.spi; 1871 id->sa_id.family = x->props.family; 1872 id->sa_id.proto = x->id.proto; 1873 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr)); 1874 id->reqid = x->props.reqid; 1875 id->flags = c->data.aevent; 1876 1877 if (x->replay_esn) { 1878 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL, 1879 xfrm_replay_state_esn_len(x->replay_esn), 1880 x->replay_esn); 1881 } else { 1882 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), 1883 &x->replay); 1884 } 1885 if (err) 1886 goto out_cancel; 1887 err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft, 1888 XFRMA_PAD); 1889 if (err) 1890 goto out_cancel; 1891 1892 if (id->flags & XFRM_AE_RTHR) { 1893 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff); 1894 if (err) 1895 goto out_cancel; 1896 } 1897 if (id->flags & XFRM_AE_ETHR) { 1898 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH, 1899 x->replay_maxage * 10 / HZ); 1900 if (err) 1901 goto out_cancel; 1902 } 1903 err = xfrm_mark_put(skb, &x->mark); 1904 if (err) 1905 goto out_cancel; 1906 1907 nlmsg_end(skb, nlh); 1908 return 0; 1909 1910 out_cancel: 1911 nlmsg_cancel(skb, nlh); 1912 return err; 1913 } 1914 1915 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 1916 struct nlattr **attrs) 1917 { 1918 struct net *net = sock_net(skb->sk); 1919 struct xfrm_state *x; 1920 struct sk_buff *r_skb; 1921 int err; 1922 struct km_event c; 1923 u32 mark; 1924 struct xfrm_mark m; 1925 struct xfrm_aevent_id *p = nlmsg_data(nlh); 1926 struct xfrm_usersa_id *id = &p->sa_id; 1927 1928 mark = xfrm_mark_get(attrs, &m); 1929 1930 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family); 1931 if (x == NULL) 1932 return -ESRCH; 1933 1934 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 1935 if (r_skb == NULL) { 1936 xfrm_state_put(x); 1937 return -ENOMEM; 1938 } 1939 1940 /* 1941 * XXX: is this lock really needed - none of the other 1942 * gets lock (the concern is things getting updated 1943 * while we are still reading) - jhs 1944 */ 1945 spin_lock_bh(&x->lock); 1946 c.data.aevent = p->flags; 1947 c.seq = nlh->nlmsg_seq; 1948 c.portid = nlh->nlmsg_pid; 1949 1950 if (build_aevent(r_skb, x, &c) < 0) 1951 BUG(); 1952 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid); 1953 spin_unlock_bh(&x->lock); 1954 xfrm_state_put(x); 1955 return err; 1956 } 1957 1958 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 1959 struct nlattr **attrs) 1960 { 1961 struct net *net = sock_net(skb->sk); 1962 struct xfrm_state *x; 1963 struct km_event c; 1964 int err = -EINVAL; 1965 u32 mark = 0; 1966 struct xfrm_mark m; 1967 struct xfrm_aevent_id *p = nlmsg_data(nlh); 1968 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 1969 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL]; 1970 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 1971 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; 1972 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; 1973 1974 if (!lt && !rp && !re && !et && !rt) 1975 return err; 1976 1977 /* pedantic mode - thou shalt sayeth replaceth */ 1978 if (!(nlh->nlmsg_flags&NLM_F_REPLACE)) 1979 return err; 1980 1981 mark = xfrm_mark_get(attrs, &m); 1982 1983 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family); 1984 if (x == NULL) 1985 return -ESRCH; 1986 1987 if (x->km.state != XFRM_STATE_VALID) 1988 goto out; 1989 1990 err = xfrm_replay_verify_len(x->replay_esn, re); 1991 if (err) 1992 goto out; 1993 1994 spin_lock_bh(&x->lock); 1995 xfrm_update_ae_params(x, attrs, 1); 1996 spin_unlock_bh(&x->lock); 1997 1998 c.event = nlh->nlmsg_type; 1999 c.seq = nlh->nlmsg_seq; 2000 c.portid = nlh->nlmsg_pid; 2001 c.data.aevent = XFRM_AE_CU; 2002 km_state_notify(x, &c); 2003 err = 0; 2004 out: 2005 xfrm_state_put(x); 2006 return err; 2007 } 2008 2009 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 2010 struct nlattr **attrs) 2011 { 2012 struct net *net = sock_net(skb->sk); 2013 struct km_event c; 2014 u8 type = XFRM_POLICY_TYPE_MAIN; 2015 int err; 2016 2017 err = copy_from_user_policy_type(&type, attrs); 2018 if (err) 2019 return err; 2020 2021 err = xfrm_policy_flush(net, type, true); 2022 if (err) { 2023 if (err == -ESRCH) /* empty table */ 2024 return 0; 2025 return err; 2026 } 2027 2028 c.data.type = type; 2029 c.event = nlh->nlmsg_type; 2030 c.seq = nlh->nlmsg_seq; 2031 c.portid = nlh->nlmsg_pid; 2032 c.net = net; 2033 km_policy_notify(NULL, 0, &c); 2034 return 0; 2035 } 2036 2037 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 2038 struct nlattr **attrs) 2039 { 2040 struct net *net = sock_net(skb->sk); 2041 struct xfrm_policy *xp; 2042 struct xfrm_user_polexpire *up = nlmsg_data(nlh); 2043 struct xfrm_userpolicy_info *p = &up->pol; 2044 u8 type = XFRM_POLICY_TYPE_MAIN; 2045 int err = -ENOENT; 2046 struct xfrm_mark m; 2047 u32 mark = xfrm_mark_get(attrs, &m); 2048 2049 err = copy_from_user_policy_type(&type, attrs); 2050 if (err) 2051 return err; 2052 2053 err = verify_policy_dir(p->dir); 2054 if (err) 2055 return err; 2056 2057 if (p->index) 2058 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err); 2059 else { 2060 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 2061 struct xfrm_sec_ctx *ctx; 2062 2063 err = verify_sec_ctx_len(attrs); 2064 if (err) 2065 return err; 2066 2067 ctx = NULL; 2068 if (rt) { 2069 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 2070 2071 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); 2072 if (err) 2073 return err; 2074 } 2075 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, 2076 &p->sel, ctx, 0, &err); 2077 security_xfrm_policy_free(ctx); 2078 } 2079 if (xp == NULL) 2080 return -ENOENT; 2081 2082 if (unlikely(xp->walk.dead)) 2083 goto out; 2084 2085 err = 0; 2086 if (up->hard) { 2087 xfrm_policy_delete(xp, p->dir); 2088 xfrm_audit_policy_delete(xp, 1, true); 2089 } 2090 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid); 2091 2092 out: 2093 xfrm_pol_put(xp); 2094 return err; 2095 } 2096 2097 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 2098 struct nlattr **attrs) 2099 { 2100 struct net *net = sock_net(skb->sk); 2101 struct xfrm_state *x; 2102 int err; 2103 struct xfrm_user_expire *ue = nlmsg_data(nlh); 2104 struct xfrm_usersa_info *p = &ue->state; 2105 struct xfrm_mark m; 2106 u32 mark = xfrm_mark_get(attrs, &m); 2107 2108 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family); 2109 2110 err = -ENOENT; 2111 if (x == NULL) 2112 return err; 2113 2114 spin_lock_bh(&x->lock); 2115 err = -EINVAL; 2116 if (x->km.state != XFRM_STATE_VALID) 2117 goto out; 2118 km_state_expired(x, ue->hard, nlh->nlmsg_pid); 2119 2120 if (ue->hard) { 2121 __xfrm_state_delete(x); 2122 xfrm_audit_state_delete(x, 1, true); 2123 } 2124 err = 0; 2125 out: 2126 spin_unlock_bh(&x->lock); 2127 xfrm_state_put(x); 2128 return err; 2129 } 2130 2131 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, 2132 struct nlattr **attrs) 2133 { 2134 struct net *net = sock_net(skb->sk); 2135 struct xfrm_policy *xp; 2136 struct xfrm_user_tmpl *ut; 2137 int i; 2138 struct nlattr *rt = attrs[XFRMA_TMPL]; 2139 struct xfrm_mark mark; 2140 2141 struct xfrm_user_acquire *ua = nlmsg_data(nlh); 2142 struct xfrm_state *x = xfrm_state_alloc(net); 2143 int err = -ENOMEM; 2144 2145 if (!x) 2146 goto nomem; 2147 2148 xfrm_mark_get(attrs, &mark); 2149 2150 err = verify_newpolicy_info(&ua->policy); 2151 if (err) 2152 goto free_state; 2153 2154 /* build an XP */ 2155 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err); 2156 if (!xp) 2157 goto free_state; 2158 2159 memcpy(&x->id, &ua->id, sizeof(ua->id)); 2160 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr)); 2161 memcpy(&x->sel, &ua->sel, sizeof(ua->sel)); 2162 xp->mark.m = x->mark.m = mark.m; 2163 xp->mark.v = x->mark.v = mark.v; 2164 ut = nla_data(rt); 2165 /* extract the templates and for each call km_key */ 2166 for (i = 0; i < xp->xfrm_nr; i++, ut++) { 2167 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 2168 memcpy(&x->id, &t->id, sizeof(x->id)); 2169 x->props.mode = t->mode; 2170 x->props.reqid = t->reqid; 2171 x->props.family = ut->family; 2172 t->aalgos = ua->aalgos; 2173 t->ealgos = ua->ealgos; 2174 t->calgos = ua->calgos; 2175 err = km_query(x, t, xp); 2176 2177 } 2178 2179 kfree(x); 2180 kfree(xp); 2181 2182 return 0; 2183 2184 free_state: 2185 kfree(x); 2186 nomem: 2187 return err; 2188 } 2189 2190 #ifdef CONFIG_XFRM_MIGRATE 2191 static int copy_from_user_migrate(struct xfrm_migrate *ma, 2192 struct xfrm_kmaddress *k, 2193 struct nlattr **attrs, int *num) 2194 { 2195 struct nlattr *rt = attrs[XFRMA_MIGRATE]; 2196 struct xfrm_user_migrate *um; 2197 int i, num_migrate; 2198 2199 if (k != NULL) { 2200 struct xfrm_user_kmaddress *uk; 2201 2202 uk = nla_data(attrs[XFRMA_KMADDRESS]); 2203 memcpy(&k->local, &uk->local, sizeof(k->local)); 2204 memcpy(&k->remote, &uk->remote, sizeof(k->remote)); 2205 k->family = uk->family; 2206 k->reserved = uk->reserved; 2207 } 2208 2209 um = nla_data(rt); 2210 num_migrate = nla_len(rt) / sizeof(*um); 2211 2212 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH) 2213 return -EINVAL; 2214 2215 for (i = 0; i < num_migrate; i++, um++, ma++) { 2216 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr)); 2217 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr)); 2218 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr)); 2219 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr)); 2220 2221 ma->proto = um->proto; 2222 ma->mode = um->mode; 2223 ma->reqid = um->reqid; 2224 2225 ma->old_family = um->old_family; 2226 ma->new_family = um->new_family; 2227 } 2228 2229 *num = i; 2230 return 0; 2231 } 2232 2233 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 2234 struct nlattr **attrs) 2235 { 2236 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh); 2237 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 2238 struct xfrm_kmaddress km, *kmp; 2239 u8 type; 2240 int err; 2241 int n = 0; 2242 struct net *net = sock_net(skb->sk); 2243 2244 if (attrs[XFRMA_MIGRATE] == NULL) 2245 return -EINVAL; 2246 2247 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL; 2248 2249 err = copy_from_user_policy_type(&type, attrs); 2250 if (err) 2251 return err; 2252 2253 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n); 2254 if (err) 2255 return err; 2256 2257 if (!n) 2258 return 0; 2259 2260 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net); 2261 2262 return 0; 2263 } 2264 #else 2265 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 2266 struct nlattr **attrs) 2267 { 2268 return -ENOPROTOOPT; 2269 } 2270 #endif 2271 2272 #ifdef CONFIG_XFRM_MIGRATE 2273 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb) 2274 { 2275 struct xfrm_user_migrate um; 2276 2277 memset(&um, 0, sizeof(um)); 2278 um.proto = m->proto; 2279 um.mode = m->mode; 2280 um.reqid = m->reqid; 2281 um.old_family = m->old_family; 2282 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr)); 2283 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr)); 2284 um.new_family = m->new_family; 2285 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr)); 2286 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr)); 2287 2288 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um); 2289 } 2290 2291 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb) 2292 { 2293 struct xfrm_user_kmaddress uk; 2294 2295 memset(&uk, 0, sizeof(uk)); 2296 uk.family = k->family; 2297 uk.reserved = k->reserved; 2298 memcpy(&uk.local, &k->local, sizeof(uk.local)); 2299 memcpy(&uk.remote, &k->remote, sizeof(uk.remote)); 2300 2301 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk); 2302 } 2303 2304 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma) 2305 { 2306 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id)) 2307 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0) 2308 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate) 2309 + userpolicy_type_attrsize(); 2310 } 2311 2312 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m, 2313 int num_migrate, const struct xfrm_kmaddress *k, 2314 const struct xfrm_selector *sel, u8 dir, u8 type) 2315 { 2316 const struct xfrm_migrate *mp; 2317 struct xfrm_userpolicy_id *pol_id; 2318 struct nlmsghdr *nlh; 2319 int i, err; 2320 2321 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0); 2322 if (nlh == NULL) 2323 return -EMSGSIZE; 2324 2325 pol_id = nlmsg_data(nlh); 2326 /* copy data from selector, dir, and type to the pol_id */ 2327 memset(pol_id, 0, sizeof(*pol_id)); 2328 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel)); 2329 pol_id->dir = dir; 2330 2331 if (k != NULL) { 2332 err = copy_to_user_kmaddress(k, skb); 2333 if (err) 2334 goto out_cancel; 2335 } 2336 err = copy_to_user_policy_type(type, skb); 2337 if (err) 2338 goto out_cancel; 2339 for (i = 0, mp = m ; i < num_migrate; i++, mp++) { 2340 err = copy_to_user_migrate(mp, skb); 2341 if (err) 2342 goto out_cancel; 2343 } 2344 2345 nlmsg_end(skb, nlh); 2346 return 0; 2347 2348 out_cancel: 2349 nlmsg_cancel(skb, nlh); 2350 return err; 2351 } 2352 2353 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2354 const struct xfrm_migrate *m, int num_migrate, 2355 const struct xfrm_kmaddress *k) 2356 { 2357 struct net *net = &init_net; 2358 struct sk_buff *skb; 2359 2360 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC); 2361 if (skb == NULL) 2362 return -ENOMEM; 2363 2364 /* build migrate */ 2365 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0) 2366 BUG(); 2367 2368 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE); 2369 } 2370 #else 2371 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2372 const struct xfrm_migrate *m, int num_migrate, 2373 const struct xfrm_kmaddress *k) 2374 { 2375 return -ENOPROTOOPT; 2376 } 2377 #endif 2378 2379 #define XMSGSIZE(type) sizeof(struct type) 2380 2381 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = { 2382 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2383 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2384 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2385 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2386 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2387 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2388 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info), 2389 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire), 2390 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire), 2391 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2392 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2393 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire), 2394 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush), 2395 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0, 2396 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2397 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2398 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report), 2399 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2400 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32), 2401 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 2402 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 2403 }; 2404 2405 #undef XMSGSIZE 2406 2407 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = { 2408 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)}, 2409 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)}, 2410 [XFRMA_LASTUSED] = { .type = NLA_U64}, 2411 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)}, 2412 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) }, 2413 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) }, 2414 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) }, 2415 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) }, 2416 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) }, 2417 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) }, 2418 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) }, 2419 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) }, 2420 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) }, 2421 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 }, 2422 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 }, 2423 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) }, 2424 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) }, 2425 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)}, 2426 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) }, 2427 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) }, 2428 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) }, 2429 [XFRMA_TFCPAD] = { .type = NLA_U32 }, 2430 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) }, 2431 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 }, 2432 [XFRMA_PROTO] = { .type = NLA_U8 }, 2433 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) }, 2434 [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) }, 2435 }; 2436 2437 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = { 2438 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) }, 2439 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) }, 2440 }; 2441 2442 static const struct xfrm_link { 2443 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **); 2444 int (*dump)(struct sk_buff *, struct netlink_callback *); 2445 int (*done)(struct netlink_callback *); 2446 const struct nla_policy *nla_pol; 2447 int nla_max; 2448 } xfrm_dispatch[XFRM_NR_MSGTYPES] = { 2449 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 2450 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa }, 2451 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa, 2452 .dump = xfrm_dump_sa, 2453 .done = xfrm_dump_sa_done }, 2454 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 2455 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy }, 2456 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy, 2457 .dump = xfrm_dump_policy, 2458 .done = xfrm_dump_policy_done }, 2459 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi }, 2460 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire }, 2461 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire }, 2462 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 2463 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 2464 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire}, 2465 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa }, 2466 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy }, 2467 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae }, 2468 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae }, 2469 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate }, 2470 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo }, 2471 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo, 2472 .nla_pol = xfrma_spd_policy, 2473 .nla_max = XFRMA_SPD_MAX }, 2474 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo }, 2475 }; 2476 2477 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 2478 { 2479 struct net *net = sock_net(skb->sk); 2480 struct nlattr *attrs[XFRMA_MAX+1]; 2481 const struct xfrm_link *link; 2482 int type, err; 2483 2484 #ifdef CONFIG_COMPAT 2485 if (in_compat_syscall()) 2486 return -EOPNOTSUPP; 2487 #endif 2488 2489 type = nlh->nlmsg_type; 2490 if (type > XFRM_MSG_MAX) 2491 return -EINVAL; 2492 2493 type -= XFRM_MSG_BASE; 2494 link = &xfrm_dispatch[type]; 2495 2496 /* All operations require privileges, even GET */ 2497 if (!netlink_net_capable(skb, CAP_NET_ADMIN)) 2498 return -EPERM; 2499 2500 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) || 2501 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) && 2502 (nlh->nlmsg_flags & NLM_F_DUMP)) { 2503 if (link->dump == NULL) 2504 return -EINVAL; 2505 2506 { 2507 struct netlink_dump_control c = { 2508 .dump = link->dump, 2509 .done = link->done, 2510 }; 2511 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c); 2512 } 2513 } 2514 2515 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, 2516 link->nla_max ? : XFRMA_MAX, 2517 link->nla_pol ? : xfrma_policy); 2518 if (err < 0) 2519 return err; 2520 2521 if (link->doit == NULL) 2522 return -EINVAL; 2523 2524 return link->doit(skb, nlh, attrs); 2525 } 2526 2527 static void xfrm_netlink_rcv(struct sk_buff *skb) 2528 { 2529 struct net *net = sock_net(skb->sk); 2530 2531 mutex_lock(&net->xfrm.xfrm_cfg_mutex); 2532 netlink_rcv_skb(skb, &xfrm_user_rcv_msg); 2533 mutex_unlock(&net->xfrm.xfrm_cfg_mutex); 2534 } 2535 2536 static inline size_t xfrm_expire_msgsize(void) 2537 { 2538 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire)) 2539 + nla_total_size(sizeof(struct xfrm_mark)); 2540 } 2541 2542 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 2543 { 2544 struct xfrm_user_expire *ue; 2545 struct nlmsghdr *nlh; 2546 int err; 2547 2548 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0); 2549 if (nlh == NULL) 2550 return -EMSGSIZE; 2551 2552 ue = nlmsg_data(nlh); 2553 copy_to_user_state(x, &ue->state); 2554 ue->hard = (c->data.hard != 0) ? 1 : 0; 2555 2556 err = xfrm_mark_put(skb, &x->mark); 2557 if (err) 2558 return err; 2559 2560 nlmsg_end(skb, nlh); 2561 return 0; 2562 } 2563 2564 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c) 2565 { 2566 struct net *net = xs_net(x); 2567 struct sk_buff *skb; 2568 2569 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC); 2570 if (skb == NULL) 2571 return -ENOMEM; 2572 2573 if (build_expire(skb, x, c) < 0) { 2574 kfree_skb(skb); 2575 return -EMSGSIZE; 2576 } 2577 2578 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE); 2579 } 2580 2581 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c) 2582 { 2583 struct net *net = xs_net(x); 2584 struct sk_buff *skb; 2585 2586 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 2587 if (skb == NULL) 2588 return -ENOMEM; 2589 2590 if (build_aevent(skb, x, c) < 0) 2591 BUG(); 2592 2593 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS); 2594 } 2595 2596 static int xfrm_notify_sa_flush(const struct km_event *c) 2597 { 2598 struct net *net = c->net; 2599 struct xfrm_usersa_flush *p; 2600 struct nlmsghdr *nlh; 2601 struct sk_buff *skb; 2602 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush)); 2603 2604 skb = nlmsg_new(len, GFP_ATOMIC); 2605 if (skb == NULL) 2606 return -ENOMEM; 2607 2608 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0); 2609 if (nlh == NULL) { 2610 kfree_skb(skb); 2611 return -EMSGSIZE; 2612 } 2613 2614 p = nlmsg_data(nlh); 2615 p->proto = c->data.proto; 2616 2617 nlmsg_end(skb, nlh); 2618 2619 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA); 2620 } 2621 2622 static inline size_t xfrm_sa_len(struct xfrm_state *x) 2623 { 2624 size_t l = 0; 2625 if (x->aead) 2626 l += nla_total_size(aead_len(x->aead)); 2627 if (x->aalg) { 2628 l += nla_total_size(sizeof(struct xfrm_algo) + 2629 (x->aalg->alg_key_len + 7) / 8); 2630 l += nla_total_size(xfrm_alg_auth_len(x->aalg)); 2631 } 2632 if (x->ealg) 2633 l += nla_total_size(xfrm_alg_len(x->ealg)); 2634 if (x->calg) 2635 l += nla_total_size(sizeof(*x->calg)); 2636 if (x->encap) 2637 l += nla_total_size(sizeof(*x->encap)); 2638 if (x->tfcpad) 2639 l += nla_total_size(sizeof(x->tfcpad)); 2640 if (x->replay_esn) 2641 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn)); 2642 else 2643 l += nla_total_size(sizeof(struct xfrm_replay_state)); 2644 if (x->security) 2645 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) + 2646 x->security->ctx_len); 2647 if (x->coaddr) 2648 l += nla_total_size(sizeof(*x->coaddr)); 2649 if (x->props.extra_flags) 2650 l += nla_total_size(sizeof(x->props.extra_flags)); 2651 if (x->xso.dev) 2652 l += nla_total_size(sizeof(x->xso)); 2653 2654 /* Must count x->lastused as it may become non-zero behind our back. */ 2655 l += nla_total_size_64bit(sizeof(u64)); 2656 2657 return l; 2658 } 2659 2660 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c) 2661 { 2662 struct net *net = xs_net(x); 2663 struct xfrm_usersa_info *p; 2664 struct xfrm_usersa_id *id; 2665 struct nlmsghdr *nlh; 2666 struct sk_buff *skb; 2667 int len = xfrm_sa_len(x); 2668 int headlen, err; 2669 2670 headlen = sizeof(*p); 2671 if (c->event == XFRM_MSG_DELSA) { 2672 len += nla_total_size(headlen); 2673 headlen = sizeof(*id); 2674 len += nla_total_size(sizeof(struct xfrm_mark)); 2675 } 2676 len += NLMSG_ALIGN(headlen); 2677 2678 skb = nlmsg_new(len, GFP_ATOMIC); 2679 if (skb == NULL) 2680 return -ENOMEM; 2681 2682 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); 2683 err = -EMSGSIZE; 2684 if (nlh == NULL) 2685 goto out_free_skb; 2686 2687 p = nlmsg_data(nlh); 2688 if (c->event == XFRM_MSG_DELSA) { 2689 struct nlattr *attr; 2690 2691 id = nlmsg_data(nlh); 2692 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr)); 2693 id->spi = x->id.spi; 2694 id->family = x->props.family; 2695 id->proto = x->id.proto; 2696 2697 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p)); 2698 err = -EMSGSIZE; 2699 if (attr == NULL) 2700 goto out_free_skb; 2701 2702 p = nla_data(attr); 2703 } 2704 err = copy_to_user_state_extra(x, p, skb); 2705 if (err) 2706 goto out_free_skb; 2707 2708 nlmsg_end(skb, nlh); 2709 2710 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA); 2711 2712 out_free_skb: 2713 kfree_skb(skb); 2714 return err; 2715 } 2716 2717 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c) 2718 { 2719 2720 switch (c->event) { 2721 case XFRM_MSG_EXPIRE: 2722 return xfrm_exp_state_notify(x, c); 2723 case XFRM_MSG_NEWAE: 2724 return xfrm_aevent_state_notify(x, c); 2725 case XFRM_MSG_DELSA: 2726 case XFRM_MSG_UPDSA: 2727 case XFRM_MSG_NEWSA: 2728 return xfrm_notify_sa(x, c); 2729 case XFRM_MSG_FLUSHSA: 2730 return xfrm_notify_sa_flush(c); 2731 default: 2732 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n", 2733 c->event); 2734 break; 2735 } 2736 2737 return 0; 2738 2739 } 2740 2741 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x, 2742 struct xfrm_policy *xp) 2743 { 2744 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire)) 2745 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 2746 + nla_total_size(sizeof(struct xfrm_mark)) 2747 + nla_total_size(xfrm_user_sec_ctx_size(x->security)) 2748 + userpolicy_type_attrsize(); 2749 } 2750 2751 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x, 2752 struct xfrm_tmpl *xt, struct xfrm_policy *xp) 2753 { 2754 __u32 seq = xfrm_get_acqseq(); 2755 struct xfrm_user_acquire *ua; 2756 struct nlmsghdr *nlh; 2757 int err; 2758 2759 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0); 2760 if (nlh == NULL) 2761 return -EMSGSIZE; 2762 2763 ua = nlmsg_data(nlh); 2764 memcpy(&ua->id, &x->id, sizeof(ua->id)); 2765 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr)); 2766 memcpy(&ua->sel, &x->sel, sizeof(ua->sel)); 2767 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT); 2768 ua->aalgos = xt->aalgos; 2769 ua->ealgos = xt->ealgos; 2770 ua->calgos = xt->calgos; 2771 ua->seq = x->km.seq = seq; 2772 2773 err = copy_to_user_tmpl(xp, skb); 2774 if (!err) 2775 err = copy_to_user_state_sec_ctx(x, skb); 2776 if (!err) 2777 err = copy_to_user_policy_type(xp->type, skb); 2778 if (!err) 2779 err = xfrm_mark_put(skb, &xp->mark); 2780 if (err) { 2781 nlmsg_cancel(skb, nlh); 2782 return err; 2783 } 2784 2785 nlmsg_end(skb, nlh); 2786 return 0; 2787 } 2788 2789 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt, 2790 struct xfrm_policy *xp) 2791 { 2792 struct net *net = xs_net(x); 2793 struct sk_buff *skb; 2794 2795 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC); 2796 if (skb == NULL) 2797 return -ENOMEM; 2798 2799 if (build_acquire(skb, x, xt, xp) < 0) 2800 BUG(); 2801 2802 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE); 2803 } 2804 2805 /* User gives us xfrm_user_policy_info followed by an array of 0 2806 * or more templates. 2807 */ 2808 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt, 2809 u8 *data, int len, int *dir) 2810 { 2811 struct net *net = sock_net(sk); 2812 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data; 2813 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1); 2814 struct xfrm_policy *xp; 2815 int nr; 2816 2817 switch (sk->sk_family) { 2818 case AF_INET: 2819 if (opt != IP_XFRM_POLICY) { 2820 *dir = -EOPNOTSUPP; 2821 return NULL; 2822 } 2823 break; 2824 #if IS_ENABLED(CONFIG_IPV6) 2825 case AF_INET6: 2826 if (opt != IPV6_XFRM_POLICY) { 2827 *dir = -EOPNOTSUPP; 2828 return NULL; 2829 } 2830 break; 2831 #endif 2832 default: 2833 *dir = -EINVAL; 2834 return NULL; 2835 } 2836 2837 *dir = -EINVAL; 2838 2839 if (len < sizeof(*p) || 2840 verify_newpolicy_info(p)) 2841 return NULL; 2842 2843 nr = ((len - sizeof(*p)) / sizeof(*ut)); 2844 if (validate_tmpl(nr, ut, p->sel.family)) 2845 return NULL; 2846 2847 if (p->dir > XFRM_POLICY_OUT) 2848 return NULL; 2849 2850 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 2851 if (xp == NULL) { 2852 *dir = -ENOBUFS; 2853 return NULL; 2854 } 2855 2856 copy_from_user_policy(xp, p); 2857 xp->type = XFRM_POLICY_TYPE_MAIN; 2858 copy_templates(xp, ut, nr); 2859 2860 *dir = p->dir; 2861 2862 return xp; 2863 } 2864 2865 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp) 2866 { 2867 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire)) 2868 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 2869 + nla_total_size(xfrm_user_sec_ctx_size(xp->security)) 2870 + nla_total_size(sizeof(struct xfrm_mark)) 2871 + userpolicy_type_attrsize(); 2872 } 2873 2874 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp, 2875 int dir, const struct km_event *c) 2876 { 2877 struct xfrm_user_polexpire *upe; 2878 int hard = c->data.hard; 2879 struct nlmsghdr *nlh; 2880 int err; 2881 2882 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0); 2883 if (nlh == NULL) 2884 return -EMSGSIZE; 2885 2886 upe = nlmsg_data(nlh); 2887 copy_to_user_policy(xp, &upe->pol, dir); 2888 err = copy_to_user_tmpl(xp, skb); 2889 if (!err) 2890 err = copy_to_user_sec_ctx(xp, skb); 2891 if (!err) 2892 err = copy_to_user_policy_type(xp->type, skb); 2893 if (!err) 2894 err = xfrm_mark_put(skb, &xp->mark); 2895 if (err) { 2896 nlmsg_cancel(skb, nlh); 2897 return err; 2898 } 2899 upe->hard = !!hard; 2900 2901 nlmsg_end(skb, nlh); 2902 return 0; 2903 } 2904 2905 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 2906 { 2907 struct net *net = xp_net(xp); 2908 struct sk_buff *skb; 2909 2910 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC); 2911 if (skb == NULL) 2912 return -ENOMEM; 2913 2914 if (build_polexpire(skb, xp, dir, c) < 0) 2915 BUG(); 2916 2917 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE); 2918 } 2919 2920 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) 2921 { 2922 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); 2923 struct net *net = xp_net(xp); 2924 struct xfrm_userpolicy_info *p; 2925 struct xfrm_userpolicy_id *id; 2926 struct nlmsghdr *nlh; 2927 struct sk_buff *skb; 2928 int headlen, err; 2929 2930 headlen = sizeof(*p); 2931 if (c->event == XFRM_MSG_DELPOLICY) { 2932 len += nla_total_size(headlen); 2933 headlen = sizeof(*id); 2934 } 2935 len += userpolicy_type_attrsize(); 2936 len += nla_total_size(sizeof(struct xfrm_mark)); 2937 len += NLMSG_ALIGN(headlen); 2938 2939 skb = nlmsg_new(len, GFP_ATOMIC); 2940 if (skb == NULL) 2941 return -ENOMEM; 2942 2943 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); 2944 err = -EMSGSIZE; 2945 if (nlh == NULL) 2946 goto out_free_skb; 2947 2948 p = nlmsg_data(nlh); 2949 if (c->event == XFRM_MSG_DELPOLICY) { 2950 struct nlattr *attr; 2951 2952 id = nlmsg_data(nlh); 2953 memset(id, 0, sizeof(*id)); 2954 id->dir = dir; 2955 if (c->data.byid) 2956 id->index = xp->index; 2957 else 2958 memcpy(&id->sel, &xp->selector, sizeof(id->sel)); 2959 2960 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p)); 2961 err = -EMSGSIZE; 2962 if (attr == NULL) 2963 goto out_free_skb; 2964 2965 p = nla_data(attr); 2966 } 2967 2968 copy_to_user_policy(xp, p, dir); 2969 err = copy_to_user_tmpl(xp, skb); 2970 if (!err) 2971 err = copy_to_user_policy_type(xp->type, skb); 2972 if (!err) 2973 err = xfrm_mark_put(skb, &xp->mark); 2974 if (err) 2975 goto out_free_skb; 2976 2977 nlmsg_end(skb, nlh); 2978 2979 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 2980 2981 out_free_skb: 2982 kfree_skb(skb); 2983 return err; 2984 } 2985 2986 static int xfrm_notify_policy_flush(const struct km_event *c) 2987 { 2988 struct net *net = c->net; 2989 struct nlmsghdr *nlh; 2990 struct sk_buff *skb; 2991 int err; 2992 2993 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC); 2994 if (skb == NULL) 2995 return -ENOMEM; 2996 2997 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0); 2998 err = -EMSGSIZE; 2999 if (nlh == NULL) 3000 goto out_free_skb; 3001 err = copy_to_user_policy_type(c->data.type, skb); 3002 if (err) 3003 goto out_free_skb; 3004 3005 nlmsg_end(skb, nlh); 3006 3007 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 3008 3009 out_free_skb: 3010 kfree_skb(skb); 3011 return err; 3012 } 3013 3014 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 3015 { 3016 3017 switch (c->event) { 3018 case XFRM_MSG_NEWPOLICY: 3019 case XFRM_MSG_UPDPOLICY: 3020 case XFRM_MSG_DELPOLICY: 3021 return xfrm_notify_policy(xp, dir, c); 3022 case XFRM_MSG_FLUSHPOLICY: 3023 return xfrm_notify_policy_flush(c); 3024 case XFRM_MSG_POLEXPIRE: 3025 return xfrm_exp_policy_notify(xp, dir, c); 3026 default: 3027 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n", 3028 c->event); 3029 } 3030 3031 return 0; 3032 3033 } 3034 3035 static inline size_t xfrm_report_msgsize(void) 3036 { 3037 return NLMSG_ALIGN(sizeof(struct xfrm_user_report)); 3038 } 3039 3040 static int build_report(struct sk_buff *skb, u8 proto, 3041 struct xfrm_selector *sel, xfrm_address_t *addr) 3042 { 3043 struct xfrm_user_report *ur; 3044 struct nlmsghdr *nlh; 3045 3046 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0); 3047 if (nlh == NULL) 3048 return -EMSGSIZE; 3049 3050 ur = nlmsg_data(nlh); 3051 ur->proto = proto; 3052 memcpy(&ur->sel, sel, sizeof(ur->sel)); 3053 3054 if (addr) { 3055 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr); 3056 if (err) { 3057 nlmsg_cancel(skb, nlh); 3058 return err; 3059 } 3060 } 3061 nlmsg_end(skb, nlh); 3062 return 0; 3063 } 3064 3065 static int xfrm_send_report(struct net *net, u8 proto, 3066 struct xfrm_selector *sel, xfrm_address_t *addr) 3067 { 3068 struct sk_buff *skb; 3069 3070 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC); 3071 if (skb == NULL) 3072 return -ENOMEM; 3073 3074 if (build_report(skb, proto, sel, addr) < 0) 3075 BUG(); 3076 3077 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT); 3078 } 3079 3080 static inline size_t xfrm_mapping_msgsize(void) 3081 { 3082 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping)); 3083 } 3084 3085 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x, 3086 xfrm_address_t *new_saddr, __be16 new_sport) 3087 { 3088 struct xfrm_user_mapping *um; 3089 struct nlmsghdr *nlh; 3090 3091 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0); 3092 if (nlh == NULL) 3093 return -EMSGSIZE; 3094 3095 um = nlmsg_data(nlh); 3096 3097 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr)); 3098 um->id.spi = x->id.spi; 3099 um->id.family = x->props.family; 3100 um->id.proto = x->id.proto; 3101 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr)); 3102 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr)); 3103 um->new_sport = new_sport; 3104 um->old_sport = x->encap->encap_sport; 3105 um->reqid = x->props.reqid; 3106 3107 nlmsg_end(skb, nlh); 3108 return 0; 3109 } 3110 3111 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, 3112 __be16 sport) 3113 { 3114 struct net *net = xs_net(x); 3115 struct sk_buff *skb; 3116 3117 if (x->id.proto != IPPROTO_ESP) 3118 return -EINVAL; 3119 3120 if (!x->encap) 3121 return -EINVAL; 3122 3123 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC); 3124 if (skb == NULL) 3125 return -ENOMEM; 3126 3127 if (build_mapping(skb, x, ipaddr, sport) < 0) 3128 BUG(); 3129 3130 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING); 3131 } 3132 3133 static bool xfrm_is_alive(const struct km_event *c) 3134 { 3135 return (bool)xfrm_acquire_is_on(c->net); 3136 } 3137 3138 static struct xfrm_mgr netlink_mgr = { 3139 .notify = xfrm_send_state_notify, 3140 .acquire = xfrm_send_acquire, 3141 .compile_policy = xfrm_compile_policy, 3142 .notify_policy = xfrm_send_policy_notify, 3143 .report = xfrm_send_report, 3144 .migrate = xfrm_send_migrate, 3145 .new_mapping = xfrm_send_mapping, 3146 .is_alive = xfrm_is_alive, 3147 }; 3148 3149 static int __net_init xfrm_user_net_init(struct net *net) 3150 { 3151 struct sock *nlsk; 3152 struct netlink_kernel_cfg cfg = { 3153 .groups = XFRMNLGRP_MAX, 3154 .input = xfrm_netlink_rcv, 3155 }; 3156 3157 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg); 3158 if (nlsk == NULL) 3159 return -ENOMEM; 3160 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */ 3161 rcu_assign_pointer(net->xfrm.nlsk, nlsk); 3162 return 0; 3163 } 3164 3165 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list) 3166 { 3167 struct net *net; 3168 list_for_each_entry(net, net_exit_list, exit_list) 3169 RCU_INIT_POINTER(net->xfrm.nlsk, NULL); 3170 synchronize_net(); 3171 list_for_each_entry(net, net_exit_list, exit_list) 3172 netlink_kernel_release(net->xfrm.nlsk_stash); 3173 } 3174 3175 static struct pernet_operations xfrm_user_net_ops = { 3176 .init = xfrm_user_net_init, 3177 .exit_batch = xfrm_user_net_exit, 3178 }; 3179 3180 static int __init xfrm_user_init(void) 3181 { 3182 int rv; 3183 3184 printk(KERN_INFO "Initializing XFRM netlink socket\n"); 3185 3186 rv = register_pernet_subsys(&xfrm_user_net_ops); 3187 if (rv < 0) 3188 return rv; 3189 rv = xfrm_register_km(&netlink_mgr); 3190 if (rv < 0) 3191 unregister_pernet_subsys(&xfrm_user_net_ops); 3192 return rv; 3193 } 3194 3195 static void __exit xfrm_user_exit(void) 3196 { 3197 xfrm_unregister_km(&netlink_mgr); 3198 unregister_pernet_subsys(&xfrm_user_net_ops); 3199 } 3200 3201 module_init(xfrm_user_init); 3202 module_exit(xfrm_user_exit); 3203 MODULE_LICENSE("GPL"); 3204 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM); 3205 3206