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 35 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type) 36 { 37 struct nlattr *rt = attrs[type]; 38 struct xfrm_algo *algp; 39 40 if (!rt) 41 return 0; 42 43 algp = nla_data(rt); 44 if (nla_len(rt) < xfrm_alg_len(algp)) 45 return -EINVAL; 46 47 switch (type) { 48 case XFRMA_ALG_AUTH: 49 case XFRMA_ALG_CRYPT: 50 case XFRMA_ALG_COMP: 51 break; 52 53 default: 54 return -EINVAL; 55 } 56 57 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; 58 return 0; 59 } 60 61 static int verify_auth_trunc(struct nlattr **attrs) 62 { 63 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC]; 64 struct xfrm_algo_auth *algp; 65 66 if (!rt) 67 return 0; 68 69 algp = nla_data(rt); 70 if (nla_len(rt) < xfrm_alg_auth_len(algp)) 71 return -EINVAL; 72 73 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; 74 return 0; 75 } 76 77 static int verify_aead(struct nlattr **attrs) 78 { 79 struct nlattr *rt = attrs[XFRMA_ALG_AEAD]; 80 struct xfrm_algo_aead *algp; 81 82 if (!rt) 83 return 0; 84 85 algp = nla_data(rt); 86 if (nla_len(rt) < aead_len(algp)) 87 return -EINVAL; 88 89 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; 90 return 0; 91 } 92 93 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type, 94 xfrm_address_t **addrp) 95 { 96 struct nlattr *rt = attrs[type]; 97 98 if (rt && addrp) 99 *addrp = nla_data(rt); 100 } 101 102 static inline int verify_sec_ctx_len(struct nlattr **attrs) 103 { 104 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 105 struct xfrm_user_sec_ctx *uctx; 106 107 if (!rt) 108 return 0; 109 110 uctx = nla_data(rt); 111 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len)) 112 return -EINVAL; 113 114 return 0; 115 } 116 117 static inline int verify_replay(struct xfrm_usersa_info *p, 118 struct nlattr **attrs) 119 { 120 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL]; 121 struct xfrm_replay_state_esn *rs; 122 123 if (p->flags & XFRM_STATE_ESN) { 124 if (!rt) 125 return -EINVAL; 126 127 rs = nla_data(rt); 128 129 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8) 130 return -EINVAL; 131 132 if (nla_len(rt) < xfrm_replay_state_esn_len(rs) && 133 nla_len(rt) != sizeof(*rs)) 134 return -EINVAL; 135 } 136 137 if (!rt) 138 return 0; 139 140 /* As only ESP and AH support ESN feature. */ 141 if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH)) 142 return -EINVAL; 143 144 if (p->replay_window != 0) 145 return -EINVAL; 146 147 return 0; 148 } 149 150 static int verify_newsa_info(struct xfrm_usersa_info *p, 151 struct nlattr **attrs) 152 { 153 int err; 154 155 err = -EINVAL; 156 switch (p->family) { 157 case AF_INET: 158 break; 159 160 case AF_INET6: 161 #if IS_ENABLED(CONFIG_IPV6) 162 break; 163 #else 164 err = -EAFNOSUPPORT; 165 goto out; 166 #endif 167 168 default: 169 goto out; 170 } 171 172 err = -EINVAL; 173 switch (p->id.proto) { 174 case IPPROTO_AH: 175 if ((!attrs[XFRMA_ALG_AUTH] && 176 !attrs[XFRMA_ALG_AUTH_TRUNC]) || 177 attrs[XFRMA_ALG_AEAD] || 178 attrs[XFRMA_ALG_CRYPT] || 179 attrs[XFRMA_ALG_COMP] || 180 attrs[XFRMA_TFCPAD]) 181 goto out; 182 break; 183 184 case IPPROTO_ESP: 185 if (attrs[XFRMA_ALG_COMP]) 186 goto out; 187 if (!attrs[XFRMA_ALG_AUTH] && 188 !attrs[XFRMA_ALG_AUTH_TRUNC] && 189 !attrs[XFRMA_ALG_CRYPT] && 190 !attrs[XFRMA_ALG_AEAD]) 191 goto out; 192 if ((attrs[XFRMA_ALG_AUTH] || 193 attrs[XFRMA_ALG_AUTH_TRUNC] || 194 attrs[XFRMA_ALG_CRYPT]) && 195 attrs[XFRMA_ALG_AEAD]) 196 goto out; 197 if (attrs[XFRMA_TFCPAD] && 198 p->mode != XFRM_MODE_TUNNEL) 199 goto out; 200 break; 201 202 case IPPROTO_COMP: 203 if (!attrs[XFRMA_ALG_COMP] || 204 attrs[XFRMA_ALG_AEAD] || 205 attrs[XFRMA_ALG_AUTH] || 206 attrs[XFRMA_ALG_AUTH_TRUNC] || 207 attrs[XFRMA_ALG_CRYPT] || 208 attrs[XFRMA_TFCPAD] || 209 (ntohl(p->id.spi) >= 0x10000)) 210 goto out; 211 break; 212 213 #if IS_ENABLED(CONFIG_IPV6) 214 case IPPROTO_DSTOPTS: 215 case IPPROTO_ROUTING: 216 if (attrs[XFRMA_ALG_COMP] || 217 attrs[XFRMA_ALG_AUTH] || 218 attrs[XFRMA_ALG_AUTH_TRUNC] || 219 attrs[XFRMA_ALG_AEAD] || 220 attrs[XFRMA_ALG_CRYPT] || 221 attrs[XFRMA_ENCAP] || 222 attrs[XFRMA_SEC_CTX] || 223 attrs[XFRMA_TFCPAD] || 224 !attrs[XFRMA_COADDR]) 225 goto out; 226 break; 227 #endif 228 229 default: 230 goto out; 231 } 232 233 if ((err = verify_aead(attrs))) 234 goto out; 235 if ((err = verify_auth_trunc(attrs))) 236 goto out; 237 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH))) 238 goto out; 239 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT))) 240 goto out; 241 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP))) 242 goto out; 243 if ((err = verify_sec_ctx_len(attrs))) 244 goto out; 245 if ((err = verify_replay(p, attrs))) 246 goto out; 247 248 err = -EINVAL; 249 switch (p->mode) { 250 case XFRM_MODE_TRANSPORT: 251 case XFRM_MODE_TUNNEL: 252 case XFRM_MODE_ROUTEOPTIMIZATION: 253 case XFRM_MODE_BEET: 254 break; 255 256 default: 257 goto out; 258 } 259 260 err = 0; 261 262 out: 263 return err; 264 } 265 266 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props, 267 struct xfrm_algo_desc *(*get_byname)(const char *, int), 268 struct nlattr *rta) 269 { 270 struct xfrm_algo *p, *ualg; 271 struct xfrm_algo_desc *algo; 272 273 if (!rta) 274 return 0; 275 276 ualg = nla_data(rta); 277 278 algo = get_byname(ualg->alg_name, 1); 279 if (!algo) 280 return -ENOSYS; 281 *props = algo->desc.sadb_alg_id; 282 283 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL); 284 if (!p) 285 return -ENOMEM; 286 287 strcpy(p->alg_name, algo->name); 288 *algpp = p; 289 return 0; 290 } 291 292 static int attach_crypt(struct xfrm_state *x, struct nlattr *rta) 293 { 294 struct xfrm_algo *p, *ualg; 295 struct xfrm_algo_desc *algo; 296 297 if (!rta) 298 return 0; 299 300 ualg = nla_data(rta); 301 302 algo = xfrm_ealg_get_byname(ualg->alg_name, 1); 303 if (!algo) 304 return -ENOSYS; 305 x->props.ealgo = algo->desc.sadb_alg_id; 306 307 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL); 308 if (!p) 309 return -ENOMEM; 310 311 strcpy(p->alg_name, algo->name); 312 x->ealg = p; 313 x->geniv = algo->uinfo.encr.geniv; 314 return 0; 315 } 316 317 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props, 318 struct nlattr *rta) 319 { 320 struct xfrm_algo *ualg; 321 struct xfrm_algo_auth *p; 322 struct xfrm_algo_desc *algo; 323 324 if (!rta) 325 return 0; 326 327 ualg = nla_data(rta); 328 329 algo = xfrm_aalg_get_byname(ualg->alg_name, 1); 330 if (!algo) 331 return -ENOSYS; 332 *props = algo->desc.sadb_alg_id; 333 334 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL); 335 if (!p) 336 return -ENOMEM; 337 338 strcpy(p->alg_name, algo->name); 339 p->alg_key_len = ualg->alg_key_len; 340 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; 341 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8); 342 343 *algpp = p; 344 return 0; 345 } 346 347 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props, 348 struct nlattr *rta) 349 { 350 struct xfrm_algo_auth *p, *ualg; 351 struct xfrm_algo_desc *algo; 352 353 if (!rta) 354 return 0; 355 356 ualg = nla_data(rta); 357 358 algo = xfrm_aalg_get_byname(ualg->alg_name, 1); 359 if (!algo) 360 return -ENOSYS; 361 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits) 362 return -EINVAL; 363 *props = algo->desc.sadb_alg_id; 364 365 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL); 366 if (!p) 367 return -ENOMEM; 368 369 strcpy(p->alg_name, algo->name); 370 if (!p->alg_trunc_len) 371 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; 372 373 *algpp = p; 374 return 0; 375 } 376 377 static int attach_aead(struct xfrm_state *x, struct nlattr *rta) 378 { 379 struct xfrm_algo_aead *p, *ualg; 380 struct xfrm_algo_desc *algo; 381 382 if (!rta) 383 return 0; 384 385 ualg = nla_data(rta); 386 387 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1); 388 if (!algo) 389 return -ENOSYS; 390 x->props.ealgo = algo->desc.sadb_alg_id; 391 392 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL); 393 if (!p) 394 return -ENOMEM; 395 396 strcpy(p->alg_name, algo->name); 397 x->aead = p; 398 x->geniv = algo->uinfo.aead.geniv; 399 return 0; 400 } 401 402 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn, 403 struct nlattr *rp) 404 { 405 struct xfrm_replay_state_esn *up; 406 int ulen; 407 408 if (!replay_esn || !rp) 409 return 0; 410 411 up = nla_data(rp); 412 ulen = xfrm_replay_state_esn_len(up); 413 414 if (nla_len(rp) < ulen || xfrm_replay_state_esn_len(replay_esn) != ulen) 415 return -EINVAL; 416 417 return 0; 418 } 419 420 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn, 421 struct xfrm_replay_state_esn **preplay_esn, 422 struct nlattr *rta) 423 { 424 struct xfrm_replay_state_esn *p, *pp, *up; 425 int klen, ulen; 426 427 if (!rta) 428 return 0; 429 430 up = nla_data(rta); 431 klen = xfrm_replay_state_esn_len(up); 432 ulen = nla_len(rta) >= klen ? klen : sizeof(*up); 433 434 p = kzalloc(klen, GFP_KERNEL); 435 if (!p) 436 return -ENOMEM; 437 438 pp = kzalloc(klen, GFP_KERNEL); 439 if (!pp) { 440 kfree(p); 441 return -ENOMEM; 442 } 443 444 memcpy(p, up, ulen); 445 memcpy(pp, up, ulen); 446 447 *replay_esn = p; 448 *preplay_esn = pp; 449 450 return 0; 451 } 452 453 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx) 454 { 455 int len = 0; 456 457 if (xfrm_ctx) { 458 len += sizeof(struct xfrm_user_sec_ctx); 459 len += xfrm_ctx->ctx_len; 460 } 461 return len; 462 } 463 464 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 465 { 466 memcpy(&x->id, &p->id, sizeof(x->id)); 467 memcpy(&x->sel, &p->sel, sizeof(x->sel)); 468 memcpy(&x->lft, &p->lft, sizeof(x->lft)); 469 x->props.mode = p->mode; 470 x->props.replay_window = min_t(unsigned int, p->replay_window, 471 sizeof(x->replay.bitmap) * 8); 472 x->props.reqid = p->reqid; 473 x->props.family = p->family; 474 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr)); 475 x->props.flags = p->flags; 476 477 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC)) 478 x->sel.family = p->family; 479 } 480 481 /* 482 * someday when pfkey also has support, we could have the code 483 * somehow made shareable and move it to xfrm_state.c - JHS 484 * 485 */ 486 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs, 487 int update_esn) 488 { 489 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 490 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL; 491 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 492 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; 493 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; 494 495 if (re) { 496 struct xfrm_replay_state_esn *replay_esn; 497 replay_esn = nla_data(re); 498 memcpy(x->replay_esn, replay_esn, 499 xfrm_replay_state_esn_len(replay_esn)); 500 memcpy(x->preplay_esn, replay_esn, 501 xfrm_replay_state_esn_len(replay_esn)); 502 } 503 504 if (rp) { 505 struct xfrm_replay_state *replay; 506 replay = nla_data(rp); 507 memcpy(&x->replay, replay, sizeof(*replay)); 508 memcpy(&x->preplay, replay, sizeof(*replay)); 509 } 510 511 if (lt) { 512 struct xfrm_lifetime_cur *ltime; 513 ltime = nla_data(lt); 514 x->curlft.bytes = ltime->bytes; 515 x->curlft.packets = ltime->packets; 516 x->curlft.add_time = ltime->add_time; 517 x->curlft.use_time = ltime->use_time; 518 } 519 520 if (et) 521 x->replay_maxage = nla_get_u32(et); 522 523 if (rt) 524 x->replay_maxdiff = nla_get_u32(rt); 525 } 526 527 static struct xfrm_state *xfrm_state_construct(struct net *net, 528 struct xfrm_usersa_info *p, 529 struct nlattr **attrs, 530 int *errp) 531 { 532 struct xfrm_state *x = xfrm_state_alloc(net); 533 int err = -ENOMEM; 534 535 if (!x) 536 goto error_no_put; 537 538 copy_from_user_state(x, p); 539 540 if (attrs[XFRMA_SA_EXTRA_FLAGS]) 541 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]); 542 543 if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD]))) 544 goto error; 545 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo, 546 attrs[XFRMA_ALG_AUTH_TRUNC]))) 547 goto error; 548 if (!x->props.aalgo) { 549 if ((err = attach_auth(&x->aalg, &x->props.aalgo, 550 attrs[XFRMA_ALG_AUTH]))) 551 goto error; 552 } 553 if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT]))) 554 goto error; 555 if ((err = attach_one_algo(&x->calg, &x->props.calgo, 556 xfrm_calg_get_byname, 557 attrs[XFRMA_ALG_COMP]))) 558 goto error; 559 560 if (attrs[XFRMA_ENCAP]) { 561 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]), 562 sizeof(*x->encap), GFP_KERNEL); 563 if (x->encap == NULL) 564 goto error; 565 } 566 567 if (attrs[XFRMA_TFCPAD]) 568 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]); 569 570 if (attrs[XFRMA_COADDR]) { 571 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]), 572 sizeof(*x->coaddr), GFP_KERNEL); 573 if (x->coaddr == NULL) 574 goto error; 575 } 576 577 xfrm_mark_get(attrs, &x->mark); 578 579 err = __xfrm_init_state(x, false); 580 if (err) 581 goto error; 582 583 if (attrs[XFRMA_SEC_CTX] && 584 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX]))) 585 goto error; 586 587 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn, 588 attrs[XFRMA_REPLAY_ESN_VAL]))) 589 goto error; 590 591 x->km.seq = p->seq; 592 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth; 593 /* sysctl_xfrm_aevent_etime is in 100ms units */ 594 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M; 595 596 if ((err = xfrm_init_replay(x))) 597 goto error; 598 599 /* override default values from above */ 600 xfrm_update_ae_params(x, attrs, 0); 601 602 return x; 603 604 error: 605 x->km.state = XFRM_STATE_DEAD; 606 xfrm_state_put(x); 607 error_no_put: 608 *errp = err; 609 return NULL; 610 } 611 612 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 613 struct nlattr **attrs) 614 { 615 struct net *net = sock_net(skb->sk); 616 struct xfrm_usersa_info *p = nlmsg_data(nlh); 617 struct xfrm_state *x; 618 int err; 619 struct km_event c; 620 621 err = verify_newsa_info(p, attrs); 622 if (err) 623 return err; 624 625 x = xfrm_state_construct(net, p, attrs, &err); 626 if (!x) 627 return err; 628 629 xfrm_state_hold(x); 630 if (nlh->nlmsg_type == XFRM_MSG_NEWSA) 631 err = xfrm_state_add(x); 632 else 633 err = xfrm_state_update(x); 634 635 xfrm_audit_state_add(x, err ? 0 : 1, true); 636 637 if (err < 0) { 638 x->km.state = XFRM_STATE_DEAD; 639 __xfrm_state_put(x); 640 goto out; 641 } 642 643 c.seq = nlh->nlmsg_seq; 644 c.portid = nlh->nlmsg_pid; 645 c.event = nlh->nlmsg_type; 646 647 km_state_notify(x, &c); 648 out: 649 xfrm_state_put(x); 650 return err; 651 } 652 653 static struct xfrm_state *xfrm_user_state_lookup(struct net *net, 654 struct xfrm_usersa_id *p, 655 struct nlattr **attrs, 656 int *errp) 657 { 658 struct xfrm_state *x = NULL; 659 struct xfrm_mark m; 660 int err; 661 u32 mark = xfrm_mark_get(attrs, &m); 662 663 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) { 664 err = -ESRCH; 665 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family); 666 } else { 667 xfrm_address_t *saddr = NULL; 668 669 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr); 670 if (!saddr) { 671 err = -EINVAL; 672 goto out; 673 } 674 675 err = -ESRCH; 676 x = xfrm_state_lookup_byaddr(net, mark, 677 &p->daddr, saddr, 678 p->proto, p->family); 679 } 680 681 out: 682 if (!x && errp) 683 *errp = err; 684 return x; 685 } 686 687 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 688 struct nlattr **attrs) 689 { 690 struct net *net = sock_net(skb->sk); 691 struct xfrm_state *x; 692 int err = -ESRCH; 693 struct km_event c; 694 struct xfrm_usersa_id *p = nlmsg_data(nlh); 695 696 x = xfrm_user_state_lookup(net, p, attrs, &err); 697 if (x == NULL) 698 return err; 699 700 if ((err = security_xfrm_state_delete(x)) != 0) 701 goto out; 702 703 if (xfrm_state_kern(x)) { 704 err = -EPERM; 705 goto out; 706 } 707 708 err = xfrm_state_delete(x); 709 710 if (err < 0) 711 goto out; 712 713 c.seq = nlh->nlmsg_seq; 714 c.portid = nlh->nlmsg_pid; 715 c.event = nlh->nlmsg_type; 716 km_state_notify(x, &c); 717 718 out: 719 xfrm_audit_state_delete(x, err ? 0 : 1, true); 720 xfrm_state_put(x); 721 return err; 722 } 723 724 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 725 { 726 memset(p, 0, sizeof(*p)); 727 memcpy(&p->id, &x->id, sizeof(p->id)); 728 memcpy(&p->sel, &x->sel, sizeof(p->sel)); 729 memcpy(&p->lft, &x->lft, sizeof(p->lft)); 730 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft)); 731 memcpy(&p->stats, &x->stats, sizeof(p->stats)); 732 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr)); 733 p->mode = x->props.mode; 734 p->replay_window = x->props.replay_window; 735 p->reqid = x->props.reqid; 736 p->family = x->props.family; 737 p->flags = x->props.flags; 738 p->seq = x->km.seq; 739 } 740 741 struct xfrm_dump_info { 742 struct sk_buff *in_skb; 743 struct sk_buff *out_skb; 744 u32 nlmsg_seq; 745 u16 nlmsg_flags; 746 }; 747 748 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb) 749 { 750 struct xfrm_user_sec_ctx *uctx; 751 struct nlattr *attr; 752 int ctx_size = sizeof(*uctx) + s->ctx_len; 753 754 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size); 755 if (attr == NULL) 756 return -EMSGSIZE; 757 758 uctx = nla_data(attr); 759 uctx->exttype = XFRMA_SEC_CTX; 760 uctx->len = ctx_size; 761 uctx->ctx_doi = s->ctx_doi; 762 uctx->ctx_alg = s->ctx_alg; 763 uctx->ctx_len = s->ctx_len; 764 memcpy(uctx + 1, s->ctx_str, s->ctx_len); 765 766 return 0; 767 } 768 769 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb) 770 { 771 struct xfrm_algo *algo; 772 struct nlattr *nla; 773 774 nla = nla_reserve(skb, XFRMA_ALG_AUTH, 775 sizeof(*algo) + (auth->alg_key_len + 7) / 8); 776 if (!nla) 777 return -EMSGSIZE; 778 779 algo = nla_data(nla); 780 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name)); 781 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8); 782 algo->alg_key_len = auth->alg_key_len; 783 784 return 0; 785 } 786 787 /* Don't change this without updating xfrm_sa_len! */ 788 static int copy_to_user_state_extra(struct xfrm_state *x, 789 struct xfrm_usersa_info *p, 790 struct sk_buff *skb) 791 { 792 int ret = 0; 793 794 copy_to_user_state(x, p); 795 796 if (x->props.extra_flags) { 797 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS, 798 x->props.extra_flags); 799 if (ret) 800 goto out; 801 } 802 803 if (x->coaddr) { 804 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr); 805 if (ret) 806 goto out; 807 } 808 if (x->lastused) { 809 ret = nla_put_u64(skb, XFRMA_LASTUSED, x->lastused); 810 if (ret) 811 goto out; 812 } 813 if (x->aead) { 814 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead); 815 if (ret) 816 goto out; 817 } 818 if (x->aalg) { 819 ret = copy_to_user_auth(x->aalg, skb); 820 if (!ret) 821 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC, 822 xfrm_alg_auth_len(x->aalg), x->aalg); 823 if (ret) 824 goto out; 825 } 826 if (x->ealg) { 827 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg); 828 if (ret) 829 goto out; 830 } 831 if (x->calg) { 832 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg); 833 if (ret) 834 goto out; 835 } 836 if (x->encap) { 837 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap); 838 if (ret) 839 goto out; 840 } 841 if (x->tfcpad) { 842 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad); 843 if (ret) 844 goto out; 845 } 846 ret = xfrm_mark_put(skb, &x->mark); 847 if (ret) 848 goto out; 849 if (x->replay_esn) 850 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL, 851 xfrm_replay_state_esn_len(x->replay_esn), 852 x->replay_esn); 853 else 854 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), 855 &x->replay); 856 if (ret) 857 goto out; 858 if (x->security) 859 ret = copy_sec_ctx(x->security, skb); 860 out: 861 return ret; 862 } 863 864 static int dump_one_state(struct xfrm_state *x, int count, void *ptr) 865 { 866 struct xfrm_dump_info *sp = ptr; 867 struct sk_buff *in_skb = sp->in_skb; 868 struct sk_buff *skb = sp->out_skb; 869 struct xfrm_usersa_info *p; 870 struct nlmsghdr *nlh; 871 int err; 872 873 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, 874 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags); 875 if (nlh == NULL) 876 return -EMSGSIZE; 877 878 p = nlmsg_data(nlh); 879 880 err = copy_to_user_state_extra(x, p, skb); 881 if (err) { 882 nlmsg_cancel(skb, nlh); 883 return err; 884 } 885 nlmsg_end(skb, nlh); 886 return 0; 887 } 888 889 static int xfrm_dump_sa_done(struct netlink_callback *cb) 890 { 891 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 892 struct sock *sk = cb->skb->sk; 893 struct net *net = sock_net(sk); 894 895 xfrm_state_walk_done(walk, net); 896 return 0; 897 } 898 899 static const struct nla_policy xfrma_policy[XFRMA_MAX+1]; 900 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb) 901 { 902 struct net *net = sock_net(skb->sk); 903 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 904 struct xfrm_dump_info info; 905 906 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) > 907 sizeof(cb->args) - sizeof(cb->args[0])); 908 909 info.in_skb = cb->skb; 910 info.out_skb = skb; 911 info.nlmsg_seq = cb->nlh->nlmsg_seq; 912 info.nlmsg_flags = NLM_F_MULTI; 913 914 if (!cb->args[0]) { 915 struct nlattr *attrs[XFRMA_MAX+1]; 916 struct xfrm_address_filter *filter = NULL; 917 u8 proto = 0; 918 int err; 919 920 cb->args[0] = 1; 921 922 err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX, 923 xfrma_policy); 924 if (err < 0) 925 return err; 926 927 if (attrs[XFRMA_ADDRESS_FILTER]) { 928 filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]), 929 sizeof(*filter), GFP_KERNEL); 930 if (filter == NULL) 931 return -ENOMEM; 932 } 933 934 if (attrs[XFRMA_PROTO]) 935 proto = nla_get_u8(attrs[XFRMA_PROTO]); 936 937 xfrm_state_walk_init(walk, proto, filter); 938 } 939 940 (void) xfrm_state_walk(net, walk, dump_one_state, &info); 941 942 return skb->len; 943 } 944 945 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb, 946 struct xfrm_state *x, u32 seq) 947 { 948 struct xfrm_dump_info info; 949 struct sk_buff *skb; 950 int err; 951 952 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 953 if (!skb) 954 return ERR_PTR(-ENOMEM); 955 956 info.in_skb = in_skb; 957 info.out_skb = skb; 958 info.nlmsg_seq = seq; 959 info.nlmsg_flags = 0; 960 961 err = dump_one_state(x, 0, &info); 962 if (err) { 963 kfree_skb(skb); 964 return ERR_PTR(err); 965 } 966 967 return skb; 968 } 969 970 /* A wrapper for nlmsg_multicast() checking that nlsk is still available. 971 * Must be called with RCU read lock. 972 */ 973 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb, 974 u32 pid, unsigned int group) 975 { 976 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk); 977 978 if (nlsk) 979 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC); 980 else 981 return -1; 982 } 983 984 static inline size_t xfrm_spdinfo_msgsize(void) 985 { 986 return NLMSG_ALIGN(4) 987 + nla_total_size(sizeof(struct xfrmu_spdinfo)) 988 + nla_total_size(sizeof(struct xfrmu_spdhinfo)) 989 + nla_total_size(sizeof(struct xfrmu_spdhthresh)) 990 + nla_total_size(sizeof(struct xfrmu_spdhthresh)); 991 } 992 993 static int build_spdinfo(struct sk_buff *skb, struct net *net, 994 u32 portid, u32 seq, u32 flags) 995 { 996 struct xfrmk_spdinfo si; 997 struct xfrmu_spdinfo spc; 998 struct xfrmu_spdhinfo sph; 999 struct xfrmu_spdhthresh spt4, spt6; 1000 struct nlmsghdr *nlh; 1001 int err; 1002 u32 *f; 1003 unsigned lseq; 1004 1005 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0); 1006 if (nlh == NULL) /* shouldn't really happen ... */ 1007 return -EMSGSIZE; 1008 1009 f = nlmsg_data(nlh); 1010 *f = flags; 1011 xfrm_spd_getinfo(net, &si); 1012 spc.incnt = si.incnt; 1013 spc.outcnt = si.outcnt; 1014 spc.fwdcnt = si.fwdcnt; 1015 spc.inscnt = si.inscnt; 1016 spc.outscnt = si.outscnt; 1017 spc.fwdscnt = si.fwdscnt; 1018 sph.spdhcnt = si.spdhcnt; 1019 sph.spdhmcnt = si.spdhmcnt; 1020 1021 do { 1022 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock); 1023 1024 spt4.lbits = net->xfrm.policy_hthresh.lbits4; 1025 spt4.rbits = net->xfrm.policy_hthresh.rbits4; 1026 spt6.lbits = net->xfrm.policy_hthresh.lbits6; 1027 spt6.rbits = net->xfrm.policy_hthresh.rbits6; 1028 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq)); 1029 1030 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc); 1031 if (!err) 1032 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph); 1033 if (!err) 1034 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4); 1035 if (!err) 1036 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6); 1037 if (err) { 1038 nlmsg_cancel(skb, nlh); 1039 return err; 1040 } 1041 1042 nlmsg_end(skb, nlh); 1043 return 0; 1044 } 1045 1046 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1047 struct nlattr **attrs) 1048 { 1049 struct net *net = sock_net(skb->sk); 1050 struct xfrmu_spdhthresh *thresh4 = NULL; 1051 struct xfrmu_spdhthresh *thresh6 = NULL; 1052 1053 /* selector prefixlen thresholds to hash policies */ 1054 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) { 1055 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH]; 1056 1057 if (nla_len(rta) < sizeof(*thresh4)) 1058 return -EINVAL; 1059 thresh4 = nla_data(rta); 1060 if (thresh4->lbits > 32 || thresh4->rbits > 32) 1061 return -EINVAL; 1062 } 1063 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) { 1064 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH]; 1065 1066 if (nla_len(rta) < sizeof(*thresh6)) 1067 return -EINVAL; 1068 thresh6 = nla_data(rta); 1069 if (thresh6->lbits > 128 || thresh6->rbits > 128) 1070 return -EINVAL; 1071 } 1072 1073 if (thresh4 || thresh6) { 1074 write_seqlock(&net->xfrm.policy_hthresh.lock); 1075 if (thresh4) { 1076 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits; 1077 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits; 1078 } 1079 if (thresh6) { 1080 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits; 1081 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits; 1082 } 1083 write_sequnlock(&net->xfrm.policy_hthresh.lock); 1084 1085 xfrm_policy_hash_rebuild(net); 1086 } 1087 1088 return 0; 1089 } 1090 1091 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1092 struct nlattr **attrs) 1093 { 1094 struct net *net = sock_net(skb->sk); 1095 struct sk_buff *r_skb; 1096 u32 *flags = nlmsg_data(nlh); 1097 u32 sportid = NETLINK_CB(skb).portid; 1098 u32 seq = nlh->nlmsg_seq; 1099 1100 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC); 1101 if (r_skb == NULL) 1102 return -ENOMEM; 1103 1104 if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0) 1105 BUG(); 1106 1107 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); 1108 } 1109 1110 static inline size_t xfrm_sadinfo_msgsize(void) 1111 { 1112 return NLMSG_ALIGN(4) 1113 + nla_total_size(sizeof(struct xfrmu_sadhinfo)) 1114 + nla_total_size(4); /* XFRMA_SAD_CNT */ 1115 } 1116 1117 static int build_sadinfo(struct sk_buff *skb, struct net *net, 1118 u32 portid, u32 seq, u32 flags) 1119 { 1120 struct xfrmk_sadinfo si; 1121 struct xfrmu_sadhinfo sh; 1122 struct nlmsghdr *nlh; 1123 int err; 1124 u32 *f; 1125 1126 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0); 1127 if (nlh == NULL) /* shouldn't really happen ... */ 1128 return -EMSGSIZE; 1129 1130 f = nlmsg_data(nlh); 1131 *f = flags; 1132 xfrm_sad_getinfo(net, &si); 1133 1134 sh.sadhmcnt = si.sadhmcnt; 1135 sh.sadhcnt = si.sadhcnt; 1136 1137 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt); 1138 if (!err) 1139 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh); 1140 if (err) { 1141 nlmsg_cancel(skb, nlh); 1142 return err; 1143 } 1144 1145 nlmsg_end(skb, nlh); 1146 return 0; 1147 } 1148 1149 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1150 struct nlattr **attrs) 1151 { 1152 struct net *net = sock_net(skb->sk); 1153 struct sk_buff *r_skb; 1154 u32 *flags = nlmsg_data(nlh); 1155 u32 sportid = NETLINK_CB(skb).portid; 1156 u32 seq = nlh->nlmsg_seq; 1157 1158 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC); 1159 if (r_skb == NULL) 1160 return -ENOMEM; 1161 1162 if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0) 1163 BUG(); 1164 1165 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); 1166 } 1167 1168 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 1169 struct nlattr **attrs) 1170 { 1171 struct net *net = sock_net(skb->sk); 1172 struct xfrm_usersa_id *p = nlmsg_data(nlh); 1173 struct xfrm_state *x; 1174 struct sk_buff *resp_skb; 1175 int err = -ESRCH; 1176 1177 x = xfrm_user_state_lookup(net, p, attrs, &err); 1178 if (x == NULL) 1179 goto out_noput; 1180 1181 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 1182 if (IS_ERR(resp_skb)) { 1183 err = PTR_ERR(resp_skb); 1184 } else { 1185 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); 1186 } 1187 xfrm_state_put(x); 1188 out_noput: 1189 return err; 1190 } 1191 1192 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, 1193 struct nlattr **attrs) 1194 { 1195 struct net *net = sock_net(skb->sk); 1196 struct xfrm_state *x; 1197 struct xfrm_userspi_info *p; 1198 struct sk_buff *resp_skb; 1199 xfrm_address_t *daddr; 1200 int family; 1201 int err; 1202 u32 mark; 1203 struct xfrm_mark m; 1204 1205 p = nlmsg_data(nlh); 1206 err = verify_spi_info(p->info.id.proto, p->min, p->max); 1207 if (err) 1208 goto out_noput; 1209 1210 family = p->info.family; 1211 daddr = &p->info.id.daddr; 1212 1213 x = NULL; 1214 1215 mark = xfrm_mark_get(attrs, &m); 1216 if (p->info.seq) { 1217 x = xfrm_find_acq_byseq(net, mark, p->info.seq); 1218 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) { 1219 xfrm_state_put(x); 1220 x = NULL; 1221 } 1222 } 1223 1224 if (!x) 1225 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid, 1226 p->info.id.proto, daddr, 1227 &p->info.saddr, 1, 1228 family); 1229 err = -ENOENT; 1230 if (x == NULL) 1231 goto out_noput; 1232 1233 err = xfrm_alloc_spi(x, p->min, p->max); 1234 if (err) 1235 goto out; 1236 1237 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 1238 if (IS_ERR(resp_skb)) { 1239 err = PTR_ERR(resp_skb); 1240 goto out; 1241 } 1242 1243 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); 1244 1245 out: 1246 xfrm_state_put(x); 1247 out_noput: 1248 return err; 1249 } 1250 1251 static int verify_policy_dir(u8 dir) 1252 { 1253 switch (dir) { 1254 case XFRM_POLICY_IN: 1255 case XFRM_POLICY_OUT: 1256 case XFRM_POLICY_FWD: 1257 break; 1258 1259 default: 1260 return -EINVAL; 1261 } 1262 1263 return 0; 1264 } 1265 1266 static int verify_policy_type(u8 type) 1267 { 1268 switch (type) { 1269 case XFRM_POLICY_TYPE_MAIN: 1270 #ifdef CONFIG_XFRM_SUB_POLICY 1271 case XFRM_POLICY_TYPE_SUB: 1272 #endif 1273 break; 1274 1275 default: 1276 return -EINVAL; 1277 } 1278 1279 return 0; 1280 } 1281 1282 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p) 1283 { 1284 int ret; 1285 1286 switch (p->share) { 1287 case XFRM_SHARE_ANY: 1288 case XFRM_SHARE_SESSION: 1289 case XFRM_SHARE_USER: 1290 case XFRM_SHARE_UNIQUE: 1291 break; 1292 1293 default: 1294 return -EINVAL; 1295 } 1296 1297 switch (p->action) { 1298 case XFRM_POLICY_ALLOW: 1299 case XFRM_POLICY_BLOCK: 1300 break; 1301 1302 default: 1303 return -EINVAL; 1304 } 1305 1306 switch (p->sel.family) { 1307 case AF_INET: 1308 break; 1309 1310 case AF_INET6: 1311 #if IS_ENABLED(CONFIG_IPV6) 1312 break; 1313 #else 1314 return -EAFNOSUPPORT; 1315 #endif 1316 1317 default: 1318 return -EINVAL; 1319 } 1320 1321 ret = verify_policy_dir(p->dir); 1322 if (ret) 1323 return ret; 1324 if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir)) 1325 return -EINVAL; 1326 1327 return 0; 1328 } 1329 1330 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs) 1331 { 1332 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1333 struct xfrm_user_sec_ctx *uctx; 1334 1335 if (!rt) 1336 return 0; 1337 1338 uctx = nla_data(rt); 1339 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL); 1340 } 1341 1342 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut, 1343 int nr) 1344 { 1345 int i; 1346 1347 xp->xfrm_nr = nr; 1348 for (i = 0; i < nr; i++, ut++) { 1349 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 1350 1351 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id)); 1352 memcpy(&t->saddr, &ut->saddr, 1353 sizeof(xfrm_address_t)); 1354 t->reqid = ut->reqid; 1355 t->mode = ut->mode; 1356 t->share = ut->share; 1357 t->optional = ut->optional; 1358 t->aalgos = ut->aalgos; 1359 t->ealgos = ut->ealgos; 1360 t->calgos = ut->calgos; 1361 /* If all masks are ~0, then we allow all algorithms. */ 1362 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos); 1363 t->encap_family = ut->family; 1364 } 1365 } 1366 1367 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family) 1368 { 1369 int i; 1370 1371 if (nr > XFRM_MAX_DEPTH) 1372 return -EINVAL; 1373 1374 for (i = 0; i < nr; i++) { 1375 /* We never validated the ut->family value, so many 1376 * applications simply leave it at zero. The check was 1377 * never made and ut->family was ignored because all 1378 * templates could be assumed to have the same family as 1379 * the policy itself. Now that we will have ipv4-in-ipv6 1380 * and ipv6-in-ipv4 tunnels, this is no longer true. 1381 */ 1382 if (!ut[i].family) 1383 ut[i].family = family; 1384 1385 switch (ut[i].family) { 1386 case AF_INET: 1387 break; 1388 #if IS_ENABLED(CONFIG_IPV6) 1389 case AF_INET6: 1390 break; 1391 #endif 1392 default: 1393 return -EINVAL; 1394 } 1395 } 1396 1397 return 0; 1398 } 1399 1400 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs) 1401 { 1402 struct nlattr *rt = attrs[XFRMA_TMPL]; 1403 1404 if (!rt) { 1405 pol->xfrm_nr = 0; 1406 } else { 1407 struct xfrm_user_tmpl *utmpl = nla_data(rt); 1408 int nr = nla_len(rt) / sizeof(*utmpl); 1409 int err; 1410 1411 err = validate_tmpl(nr, utmpl, pol->family); 1412 if (err) 1413 return err; 1414 1415 copy_templates(pol, utmpl, nr); 1416 } 1417 return 0; 1418 } 1419 1420 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs) 1421 { 1422 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE]; 1423 struct xfrm_userpolicy_type *upt; 1424 u8 type = XFRM_POLICY_TYPE_MAIN; 1425 int err; 1426 1427 if (rt) { 1428 upt = nla_data(rt); 1429 type = upt->type; 1430 } 1431 1432 err = verify_policy_type(type); 1433 if (err) 1434 return err; 1435 1436 *tp = type; 1437 return 0; 1438 } 1439 1440 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p) 1441 { 1442 xp->priority = p->priority; 1443 xp->index = p->index; 1444 memcpy(&xp->selector, &p->sel, sizeof(xp->selector)); 1445 memcpy(&xp->lft, &p->lft, sizeof(xp->lft)); 1446 xp->action = p->action; 1447 xp->flags = p->flags; 1448 xp->family = p->sel.family; 1449 /* XXX xp->share = p->share; */ 1450 } 1451 1452 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir) 1453 { 1454 memset(p, 0, sizeof(*p)); 1455 memcpy(&p->sel, &xp->selector, sizeof(p->sel)); 1456 memcpy(&p->lft, &xp->lft, sizeof(p->lft)); 1457 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft)); 1458 p->priority = xp->priority; 1459 p->index = xp->index; 1460 p->sel.family = xp->family; 1461 p->dir = dir; 1462 p->action = xp->action; 1463 p->flags = xp->flags; 1464 p->share = XFRM_SHARE_ANY; /* XXX xp->share */ 1465 } 1466 1467 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp) 1468 { 1469 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL); 1470 int err; 1471 1472 if (!xp) { 1473 *errp = -ENOMEM; 1474 return NULL; 1475 } 1476 1477 copy_from_user_policy(xp, p); 1478 1479 err = copy_from_user_policy_type(&xp->type, attrs); 1480 if (err) 1481 goto error; 1482 1483 if (!(err = copy_from_user_tmpl(xp, attrs))) 1484 err = copy_from_user_sec_ctx(xp, attrs); 1485 if (err) 1486 goto error; 1487 1488 xfrm_mark_get(attrs, &xp->mark); 1489 1490 return xp; 1491 error: 1492 *errp = err; 1493 xp->walk.dead = 1; 1494 xfrm_policy_destroy(xp); 1495 return NULL; 1496 } 1497 1498 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1499 struct nlattr **attrs) 1500 { 1501 struct net *net = sock_net(skb->sk); 1502 struct xfrm_userpolicy_info *p = nlmsg_data(nlh); 1503 struct xfrm_policy *xp; 1504 struct km_event c; 1505 int err; 1506 int excl; 1507 1508 err = verify_newpolicy_info(p); 1509 if (err) 1510 return err; 1511 err = verify_sec_ctx_len(attrs); 1512 if (err) 1513 return err; 1514 1515 xp = xfrm_policy_construct(net, p, attrs, &err); 1516 if (!xp) 1517 return err; 1518 1519 /* shouldn't excl be based on nlh flags?? 1520 * Aha! this is anti-netlink really i.e more pfkey derived 1521 * in netlink excl is a flag and you wouldnt need 1522 * a type XFRM_MSG_UPDPOLICY - JHS */ 1523 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY; 1524 err = xfrm_policy_insert(p->dir, xp, excl); 1525 xfrm_audit_policy_add(xp, err ? 0 : 1, true); 1526 1527 if (err) { 1528 security_xfrm_policy_free(xp->security); 1529 kfree(xp); 1530 return err; 1531 } 1532 1533 c.event = nlh->nlmsg_type; 1534 c.seq = nlh->nlmsg_seq; 1535 c.portid = nlh->nlmsg_pid; 1536 km_policy_notify(xp, p->dir, &c); 1537 1538 xfrm_pol_put(xp); 1539 1540 return 0; 1541 } 1542 1543 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb) 1544 { 1545 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH]; 1546 int i; 1547 1548 if (xp->xfrm_nr == 0) 1549 return 0; 1550 1551 for (i = 0; i < xp->xfrm_nr; i++) { 1552 struct xfrm_user_tmpl *up = &vec[i]; 1553 struct xfrm_tmpl *kp = &xp->xfrm_vec[i]; 1554 1555 memset(up, 0, sizeof(*up)); 1556 memcpy(&up->id, &kp->id, sizeof(up->id)); 1557 up->family = kp->encap_family; 1558 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr)); 1559 up->reqid = kp->reqid; 1560 up->mode = kp->mode; 1561 up->share = kp->share; 1562 up->optional = kp->optional; 1563 up->aalgos = kp->aalgos; 1564 up->ealgos = kp->ealgos; 1565 up->calgos = kp->calgos; 1566 } 1567 1568 return nla_put(skb, XFRMA_TMPL, 1569 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec); 1570 } 1571 1572 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb) 1573 { 1574 if (x->security) { 1575 return copy_sec_ctx(x->security, skb); 1576 } 1577 return 0; 1578 } 1579 1580 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb) 1581 { 1582 if (xp->security) 1583 return copy_sec_ctx(xp->security, skb); 1584 return 0; 1585 } 1586 static inline size_t userpolicy_type_attrsize(void) 1587 { 1588 #ifdef CONFIG_XFRM_SUB_POLICY 1589 return nla_total_size(sizeof(struct xfrm_userpolicy_type)); 1590 #else 1591 return 0; 1592 #endif 1593 } 1594 1595 #ifdef CONFIG_XFRM_SUB_POLICY 1596 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1597 { 1598 struct xfrm_userpolicy_type upt = { 1599 .type = type, 1600 }; 1601 1602 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt); 1603 } 1604 1605 #else 1606 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1607 { 1608 return 0; 1609 } 1610 #endif 1611 1612 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr) 1613 { 1614 struct xfrm_dump_info *sp = ptr; 1615 struct xfrm_userpolicy_info *p; 1616 struct sk_buff *in_skb = sp->in_skb; 1617 struct sk_buff *skb = sp->out_skb; 1618 struct nlmsghdr *nlh; 1619 int err; 1620 1621 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, 1622 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags); 1623 if (nlh == NULL) 1624 return -EMSGSIZE; 1625 1626 p = nlmsg_data(nlh); 1627 copy_to_user_policy(xp, p, dir); 1628 err = copy_to_user_tmpl(xp, skb); 1629 if (!err) 1630 err = copy_to_user_sec_ctx(xp, skb); 1631 if (!err) 1632 err = copy_to_user_policy_type(xp->type, skb); 1633 if (!err) 1634 err = xfrm_mark_put(skb, &xp->mark); 1635 if (err) { 1636 nlmsg_cancel(skb, nlh); 1637 return err; 1638 } 1639 nlmsg_end(skb, nlh); 1640 return 0; 1641 } 1642 1643 static int xfrm_dump_policy_done(struct netlink_callback *cb) 1644 { 1645 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1]; 1646 struct net *net = sock_net(cb->skb->sk); 1647 1648 xfrm_policy_walk_done(walk, net); 1649 return 0; 1650 } 1651 1652 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb) 1653 { 1654 struct net *net = sock_net(skb->sk); 1655 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1]; 1656 struct xfrm_dump_info info; 1657 1658 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) > 1659 sizeof(cb->args) - sizeof(cb->args[0])); 1660 1661 info.in_skb = cb->skb; 1662 info.out_skb = skb; 1663 info.nlmsg_seq = cb->nlh->nlmsg_seq; 1664 info.nlmsg_flags = NLM_F_MULTI; 1665 1666 if (!cb->args[0]) { 1667 cb->args[0] = 1; 1668 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY); 1669 } 1670 1671 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info); 1672 1673 return skb->len; 1674 } 1675 1676 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb, 1677 struct xfrm_policy *xp, 1678 int dir, u32 seq) 1679 { 1680 struct xfrm_dump_info info; 1681 struct sk_buff *skb; 1682 int err; 1683 1684 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1685 if (!skb) 1686 return ERR_PTR(-ENOMEM); 1687 1688 info.in_skb = in_skb; 1689 info.out_skb = skb; 1690 info.nlmsg_seq = seq; 1691 info.nlmsg_flags = 0; 1692 1693 err = dump_one_policy(xp, dir, 0, &info); 1694 if (err) { 1695 kfree_skb(skb); 1696 return ERR_PTR(err); 1697 } 1698 1699 return skb; 1700 } 1701 1702 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1703 struct nlattr **attrs) 1704 { 1705 struct net *net = sock_net(skb->sk); 1706 struct xfrm_policy *xp; 1707 struct xfrm_userpolicy_id *p; 1708 u8 type = XFRM_POLICY_TYPE_MAIN; 1709 int err; 1710 struct km_event c; 1711 int delete; 1712 struct xfrm_mark m; 1713 u32 mark = xfrm_mark_get(attrs, &m); 1714 1715 p = nlmsg_data(nlh); 1716 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY; 1717 1718 err = copy_from_user_policy_type(&type, attrs); 1719 if (err) 1720 return err; 1721 1722 err = verify_policy_dir(p->dir); 1723 if (err) 1724 return err; 1725 1726 if (p->index) 1727 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err); 1728 else { 1729 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1730 struct xfrm_sec_ctx *ctx; 1731 1732 err = verify_sec_ctx_len(attrs); 1733 if (err) 1734 return err; 1735 1736 ctx = NULL; 1737 if (rt) { 1738 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 1739 1740 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); 1741 if (err) 1742 return err; 1743 } 1744 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel, 1745 ctx, delete, &err); 1746 security_xfrm_policy_free(ctx); 1747 } 1748 if (xp == NULL) 1749 return -ENOENT; 1750 1751 if (!delete) { 1752 struct sk_buff *resp_skb; 1753 1754 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq); 1755 if (IS_ERR(resp_skb)) { 1756 err = PTR_ERR(resp_skb); 1757 } else { 1758 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, 1759 NETLINK_CB(skb).portid); 1760 } 1761 } else { 1762 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 1763 1764 if (err != 0) 1765 goto out; 1766 1767 c.data.byid = p->index; 1768 c.event = nlh->nlmsg_type; 1769 c.seq = nlh->nlmsg_seq; 1770 c.portid = nlh->nlmsg_pid; 1771 km_policy_notify(xp, p->dir, &c); 1772 } 1773 1774 out: 1775 xfrm_pol_put(xp); 1776 if (delete && err == 0) 1777 xfrm_garbage_collect(net); 1778 return err; 1779 } 1780 1781 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 1782 struct nlattr **attrs) 1783 { 1784 struct net *net = sock_net(skb->sk); 1785 struct km_event c; 1786 struct xfrm_usersa_flush *p = nlmsg_data(nlh); 1787 int err; 1788 1789 err = xfrm_state_flush(net, p->proto, true); 1790 if (err) { 1791 if (err == -ESRCH) /* empty table */ 1792 return 0; 1793 return err; 1794 } 1795 c.data.proto = p->proto; 1796 c.event = nlh->nlmsg_type; 1797 c.seq = nlh->nlmsg_seq; 1798 c.portid = nlh->nlmsg_pid; 1799 c.net = net; 1800 km_state_notify(NULL, &c); 1801 1802 return 0; 1803 } 1804 1805 static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x) 1806 { 1807 size_t replay_size = x->replay_esn ? 1808 xfrm_replay_state_esn_len(x->replay_esn) : 1809 sizeof(struct xfrm_replay_state); 1810 1811 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id)) 1812 + nla_total_size(replay_size) 1813 + nla_total_size(sizeof(struct xfrm_lifetime_cur)) 1814 + nla_total_size(sizeof(struct xfrm_mark)) 1815 + nla_total_size(4) /* XFRM_AE_RTHR */ 1816 + nla_total_size(4); /* XFRM_AE_ETHR */ 1817 } 1818 1819 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 1820 { 1821 struct xfrm_aevent_id *id; 1822 struct nlmsghdr *nlh; 1823 int err; 1824 1825 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0); 1826 if (nlh == NULL) 1827 return -EMSGSIZE; 1828 1829 id = nlmsg_data(nlh); 1830 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr)); 1831 id->sa_id.spi = x->id.spi; 1832 id->sa_id.family = x->props.family; 1833 id->sa_id.proto = x->id.proto; 1834 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr)); 1835 id->reqid = x->props.reqid; 1836 id->flags = c->data.aevent; 1837 1838 if (x->replay_esn) { 1839 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL, 1840 xfrm_replay_state_esn_len(x->replay_esn), 1841 x->replay_esn); 1842 } else { 1843 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), 1844 &x->replay); 1845 } 1846 if (err) 1847 goto out_cancel; 1848 err = nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft); 1849 if (err) 1850 goto out_cancel; 1851 1852 if (id->flags & XFRM_AE_RTHR) { 1853 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff); 1854 if (err) 1855 goto out_cancel; 1856 } 1857 if (id->flags & XFRM_AE_ETHR) { 1858 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH, 1859 x->replay_maxage * 10 / HZ); 1860 if (err) 1861 goto out_cancel; 1862 } 1863 err = xfrm_mark_put(skb, &x->mark); 1864 if (err) 1865 goto out_cancel; 1866 1867 nlmsg_end(skb, nlh); 1868 return 0; 1869 1870 out_cancel: 1871 nlmsg_cancel(skb, nlh); 1872 return err; 1873 } 1874 1875 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 1876 struct nlattr **attrs) 1877 { 1878 struct net *net = sock_net(skb->sk); 1879 struct xfrm_state *x; 1880 struct sk_buff *r_skb; 1881 int err; 1882 struct km_event c; 1883 u32 mark; 1884 struct xfrm_mark m; 1885 struct xfrm_aevent_id *p = nlmsg_data(nlh); 1886 struct xfrm_usersa_id *id = &p->sa_id; 1887 1888 mark = xfrm_mark_get(attrs, &m); 1889 1890 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family); 1891 if (x == NULL) 1892 return -ESRCH; 1893 1894 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 1895 if (r_skb == NULL) { 1896 xfrm_state_put(x); 1897 return -ENOMEM; 1898 } 1899 1900 /* 1901 * XXX: is this lock really needed - none of the other 1902 * gets lock (the concern is things getting updated 1903 * while we are still reading) - jhs 1904 */ 1905 spin_lock_bh(&x->lock); 1906 c.data.aevent = p->flags; 1907 c.seq = nlh->nlmsg_seq; 1908 c.portid = nlh->nlmsg_pid; 1909 1910 if (build_aevent(r_skb, x, &c) < 0) 1911 BUG(); 1912 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid); 1913 spin_unlock_bh(&x->lock); 1914 xfrm_state_put(x); 1915 return err; 1916 } 1917 1918 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 1919 struct nlattr **attrs) 1920 { 1921 struct net *net = sock_net(skb->sk); 1922 struct xfrm_state *x; 1923 struct km_event c; 1924 int err = -EINVAL; 1925 u32 mark = 0; 1926 struct xfrm_mark m; 1927 struct xfrm_aevent_id *p = nlmsg_data(nlh); 1928 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 1929 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL]; 1930 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 1931 1932 if (!lt && !rp && !re) 1933 return err; 1934 1935 /* pedantic mode - thou shalt sayeth replaceth */ 1936 if (!(nlh->nlmsg_flags&NLM_F_REPLACE)) 1937 return err; 1938 1939 mark = xfrm_mark_get(attrs, &m); 1940 1941 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family); 1942 if (x == NULL) 1943 return -ESRCH; 1944 1945 if (x->km.state != XFRM_STATE_VALID) 1946 goto out; 1947 1948 err = xfrm_replay_verify_len(x->replay_esn, re); 1949 if (err) 1950 goto out; 1951 1952 spin_lock_bh(&x->lock); 1953 xfrm_update_ae_params(x, attrs, 1); 1954 spin_unlock_bh(&x->lock); 1955 1956 c.event = nlh->nlmsg_type; 1957 c.seq = nlh->nlmsg_seq; 1958 c.portid = nlh->nlmsg_pid; 1959 c.data.aevent = XFRM_AE_CU; 1960 km_state_notify(x, &c); 1961 err = 0; 1962 out: 1963 xfrm_state_put(x); 1964 return err; 1965 } 1966 1967 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1968 struct nlattr **attrs) 1969 { 1970 struct net *net = sock_net(skb->sk); 1971 struct km_event c; 1972 u8 type = XFRM_POLICY_TYPE_MAIN; 1973 int err; 1974 1975 err = copy_from_user_policy_type(&type, attrs); 1976 if (err) 1977 return err; 1978 1979 err = xfrm_policy_flush(net, type, true); 1980 if (err) { 1981 if (err == -ESRCH) /* empty table */ 1982 return 0; 1983 return err; 1984 } 1985 1986 c.data.type = type; 1987 c.event = nlh->nlmsg_type; 1988 c.seq = nlh->nlmsg_seq; 1989 c.portid = nlh->nlmsg_pid; 1990 c.net = net; 1991 km_policy_notify(NULL, 0, &c); 1992 return 0; 1993 } 1994 1995 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 1996 struct nlattr **attrs) 1997 { 1998 struct net *net = sock_net(skb->sk); 1999 struct xfrm_policy *xp; 2000 struct xfrm_user_polexpire *up = nlmsg_data(nlh); 2001 struct xfrm_userpolicy_info *p = &up->pol; 2002 u8 type = XFRM_POLICY_TYPE_MAIN; 2003 int err = -ENOENT; 2004 struct xfrm_mark m; 2005 u32 mark = xfrm_mark_get(attrs, &m); 2006 2007 err = copy_from_user_policy_type(&type, attrs); 2008 if (err) 2009 return err; 2010 2011 err = verify_policy_dir(p->dir); 2012 if (err) 2013 return err; 2014 2015 if (p->index) 2016 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err); 2017 else { 2018 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 2019 struct xfrm_sec_ctx *ctx; 2020 2021 err = verify_sec_ctx_len(attrs); 2022 if (err) 2023 return err; 2024 2025 ctx = NULL; 2026 if (rt) { 2027 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 2028 2029 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); 2030 if (err) 2031 return err; 2032 } 2033 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, 2034 &p->sel, ctx, 0, &err); 2035 security_xfrm_policy_free(ctx); 2036 } 2037 if (xp == NULL) 2038 return -ENOENT; 2039 2040 if (unlikely(xp->walk.dead)) 2041 goto out; 2042 2043 err = 0; 2044 if (up->hard) { 2045 xfrm_policy_delete(xp, p->dir); 2046 xfrm_audit_policy_delete(xp, 1, true); 2047 } else { 2048 // reset the timers here? 2049 WARN(1, "Don't know what to do with soft policy expire\n"); 2050 } 2051 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid); 2052 2053 out: 2054 xfrm_pol_put(xp); 2055 return err; 2056 } 2057 2058 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 2059 struct nlattr **attrs) 2060 { 2061 struct net *net = sock_net(skb->sk); 2062 struct xfrm_state *x; 2063 int err; 2064 struct xfrm_user_expire *ue = nlmsg_data(nlh); 2065 struct xfrm_usersa_info *p = &ue->state; 2066 struct xfrm_mark m; 2067 u32 mark = xfrm_mark_get(attrs, &m); 2068 2069 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family); 2070 2071 err = -ENOENT; 2072 if (x == NULL) 2073 return err; 2074 2075 spin_lock_bh(&x->lock); 2076 err = -EINVAL; 2077 if (x->km.state != XFRM_STATE_VALID) 2078 goto out; 2079 km_state_expired(x, ue->hard, nlh->nlmsg_pid); 2080 2081 if (ue->hard) { 2082 __xfrm_state_delete(x); 2083 xfrm_audit_state_delete(x, 1, true); 2084 } 2085 err = 0; 2086 out: 2087 spin_unlock_bh(&x->lock); 2088 xfrm_state_put(x); 2089 return err; 2090 } 2091 2092 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, 2093 struct nlattr **attrs) 2094 { 2095 struct net *net = sock_net(skb->sk); 2096 struct xfrm_policy *xp; 2097 struct xfrm_user_tmpl *ut; 2098 int i; 2099 struct nlattr *rt = attrs[XFRMA_TMPL]; 2100 struct xfrm_mark mark; 2101 2102 struct xfrm_user_acquire *ua = nlmsg_data(nlh); 2103 struct xfrm_state *x = xfrm_state_alloc(net); 2104 int err = -ENOMEM; 2105 2106 if (!x) 2107 goto nomem; 2108 2109 xfrm_mark_get(attrs, &mark); 2110 2111 err = verify_newpolicy_info(&ua->policy); 2112 if (err) 2113 goto bad_policy; 2114 2115 /* build an XP */ 2116 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err); 2117 if (!xp) 2118 goto free_state; 2119 2120 memcpy(&x->id, &ua->id, sizeof(ua->id)); 2121 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr)); 2122 memcpy(&x->sel, &ua->sel, sizeof(ua->sel)); 2123 xp->mark.m = x->mark.m = mark.m; 2124 xp->mark.v = x->mark.v = mark.v; 2125 ut = nla_data(rt); 2126 /* extract the templates and for each call km_key */ 2127 for (i = 0; i < xp->xfrm_nr; i++, ut++) { 2128 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 2129 memcpy(&x->id, &t->id, sizeof(x->id)); 2130 x->props.mode = t->mode; 2131 x->props.reqid = t->reqid; 2132 x->props.family = ut->family; 2133 t->aalgos = ua->aalgos; 2134 t->ealgos = ua->ealgos; 2135 t->calgos = ua->calgos; 2136 err = km_query(x, t, xp); 2137 2138 } 2139 2140 kfree(x); 2141 kfree(xp); 2142 2143 return 0; 2144 2145 bad_policy: 2146 WARN(1, "BAD policy passed\n"); 2147 free_state: 2148 kfree(x); 2149 nomem: 2150 return err; 2151 } 2152 2153 #ifdef CONFIG_XFRM_MIGRATE 2154 static int copy_from_user_migrate(struct xfrm_migrate *ma, 2155 struct xfrm_kmaddress *k, 2156 struct nlattr **attrs, int *num) 2157 { 2158 struct nlattr *rt = attrs[XFRMA_MIGRATE]; 2159 struct xfrm_user_migrate *um; 2160 int i, num_migrate; 2161 2162 if (k != NULL) { 2163 struct xfrm_user_kmaddress *uk; 2164 2165 uk = nla_data(attrs[XFRMA_KMADDRESS]); 2166 memcpy(&k->local, &uk->local, sizeof(k->local)); 2167 memcpy(&k->remote, &uk->remote, sizeof(k->remote)); 2168 k->family = uk->family; 2169 k->reserved = uk->reserved; 2170 } 2171 2172 um = nla_data(rt); 2173 num_migrate = nla_len(rt) / sizeof(*um); 2174 2175 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH) 2176 return -EINVAL; 2177 2178 for (i = 0; i < num_migrate; i++, um++, ma++) { 2179 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr)); 2180 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr)); 2181 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr)); 2182 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr)); 2183 2184 ma->proto = um->proto; 2185 ma->mode = um->mode; 2186 ma->reqid = um->reqid; 2187 2188 ma->old_family = um->old_family; 2189 ma->new_family = um->new_family; 2190 } 2191 2192 *num = i; 2193 return 0; 2194 } 2195 2196 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 2197 struct nlattr **attrs) 2198 { 2199 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh); 2200 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 2201 struct xfrm_kmaddress km, *kmp; 2202 u8 type; 2203 int err; 2204 int n = 0; 2205 struct net *net = sock_net(skb->sk); 2206 2207 if (attrs[XFRMA_MIGRATE] == NULL) 2208 return -EINVAL; 2209 2210 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL; 2211 2212 err = copy_from_user_policy_type(&type, attrs); 2213 if (err) 2214 return err; 2215 2216 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n); 2217 if (err) 2218 return err; 2219 2220 if (!n) 2221 return 0; 2222 2223 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net); 2224 2225 return 0; 2226 } 2227 #else 2228 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 2229 struct nlattr **attrs) 2230 { 2231 return -ENOPROTOOPT; 2232 } 2233 #endif 2234 2235 #ifdef CONFIG_XFRM_MIGRATE 2236 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb) 2237 { 2238 struct xfrm_user_migrate um; 2239 2240 memset(&um, 0, sizeof(um)); 2241 um.proto = m->proto; 2242 um.mode = m->mode; 2243 um.reqid = m->reqid; 2244 um.old_family = m->old_family; 2245 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr)); 2246 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr)); 2247 um.new_family = m->new_family; 2248 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr)); 2249 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr)); 2250 2251 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um); 2252 } 2253 2254 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb) 2255 { 2256 struct xfrm_user_kmaddress uk; 2257 2258 memset(&uk, 0, sizeof(uk)); 2259 uk.family = k->family; 2260 uk.reserved = k->reserved; 2261 memcpy(&uk.local, &k->local, sizeof(uk.local)); 2262 memcpy(&uk.remote, &k->remote, sizeof(uk.remote)); 2263 2264 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk); 2265 } 2266 2267 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma) 2268 { 2269 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id)) 2270 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0) 2271 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate) 2272 + userpolicy_type_attrsize(); 2273 } 2274 2275 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m, 2276 int num_migrate, const struct xfrm_kmaddress *k, 2277 const struct xfrm_selector *sel, u8 dir, u8 type) 2278 { 2279 const struct xfrm_migrate *mp; 2280 struct xfrm_userpolicy_id *pol_id; 2281 struct nlmsghdr *nlh; 2282 int i, err; 2283 2284 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0); 2285 if (nlh == NULL) 2286 return -EMSGSIZE; 2287 2288 pol_id = nlmsg_data(nlh); 2289 /* copy data from selector, dir, and type to the pol_id */ 2290 memset(pol_id, 0, sizeof(*pol_id)); 2291 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel)); 2292 pol_id->dir = dir; 2293 2294 if (k != NULL) { 2295 err = copy_to_user_kmaddress(k, skb); 2296 if (err) 2297 goto out_cancel; 2298 } 2299 err = copy_to_user_policy_type(type, skb); 2300 if (err) 2301 goto out_cancel; 2302 for (i = 0, mp = m ; i < num_migrate; i++, mp++) { 2303 err = copy_to_user_migrate(mp, skb); 2304 if (err) 2305 goto out_cancel; 2306 } 2307 2308 nlmsg_end(skb, nlh); 2309 return 0; 2310 2311 out_cancel: 2312 nlmsg_cancel(skb, nlh); 2313 return err; 2314 } 2315 2316 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2317 const struct xfrm_migrate *m, int num_migrate, 2318 const struct xfrm_kmaddress *k) 2319 { 2320 struct net *net = &init_net; 2321 struct sk_buff *skb; 2322 2323 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC); 2324 if (skb == NULL) 2325 return -ENOMEM; 2326 2327 /* build migrate */ 2328 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0) 2329 BUG(); 2330 2331 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE); 2332 } 2333 #else 2334 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2335 const struct xfrm_migrate *m, int num_migrate, 2336 const struct xfrm_kmaddress *k) 2337 { 2338 return -ENOPROTOOPT; 2339 } 2340 #endif 2341 2342 #define XMSGSIZE(type) sizeof(struct type) 2343 2344 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = { 2345 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2346 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2347 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2348 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2349 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2350 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2351 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info), 2352 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire), 2353 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire), 2354 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2355 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2356 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire), 2357 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush), 2358 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0, 2359 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2360 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2361 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report), 2362 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2363 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32), 2364 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 2365 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 2366 }; 2367 2368 #undef XMSGSIZE 2369 2370 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = { 2371 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)}, 2372 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)}, 2373 [XFRMA_LASTUSED] = { .type = NLA_U64}, 2374 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)}, 2375 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) }, 2376 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) }, 2377 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) }, 2378 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) }, 2379 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) }, 2380 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) }, 2381 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) }, 2382 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) }, 2383 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) }, 2384 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 }, 2385 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 }, 2386 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) }, 2387 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) }, 2388 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)}, 2389 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) }, 2390 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) }, 2391 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) }, 2392 [XFRMA_TFCPAD] = { .type = NLA_U32 }, 2393 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) }, 2394 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 }, 2395 [XFRMA_PROTO] = { .type = NLA_U8 }, 2396 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) }, 2397 }; 2398 2399 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = { 2400 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) }, 2401 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) }, 2402 }; 2403 2404 static const struct xfrm_link { 2405 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **); 2406 int (*dump)(struct sk_buff *, struct netlink_callback *); 2407 int (*done)(struct netlink_callback *); 2408 const struct nla_policy *nla_pol; 2409 int nla_max; 2410 } xfrm_dispatch[XFRM_NR_MSGTYPES] = { 2411 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 2412 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa }, 2413 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa, 2414 .dump = xfrm_dump_sa, 2415 .done = xfrm_dump_sa_done }, 2416 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 2417 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy }, 2418 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy, 2419 .dump = xfrm_dump_policy, 2420 .done = xfrm_dump_policy_done }, 2421 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi }, 2422 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire }, 2423 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire }, 2424 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 2425 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 2426 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire}, 2427 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa }, 2428 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy }, 2429 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae }, 2430 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae }, 2431 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate }, 2432 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo }, 2433 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo, 2434 .nla_pol = xfrma_spd_policy, 2435 .nla_max = XFRMA_SPD_MAX }, 2436 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo }, 2437 }; 2438 2439 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 2440 { 2441 struct net *net = sock_net(skb->sk); 2442 struct nlattr *attrs[XFRMA_MAX+1]; 2443 const struct xfrm_link *link; 2444 int type, err; 2445 2446 #ifdef CONFIG_COMPAT 2447 if (is_compat_task()) 2448 return -ENOTSUPP; 2449 #endif 2450 2451 type = nlh->nlmsg_type; 2452 if (type > XFRM_MSG_MAX) 2453 return -EINVAL; 2454 2455 type -= XFRM_MSG_BASE; 2456 link = &xfrm_dispatch[type]; 2457 2458 /* All operations require privileges, even GET */ 2459 if (!netlink_net_capable(skb, CAP_NET_ADMIN)) 2460 return -EPERM; 2461 2462 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) || 2463 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) && 2464 (nlh->nlmsg_flags & NLM_F_DUMP)) { 2465 if (link->dump == NULL) 2466 return -EINVAL; 2467 2468 { 2469 struct netlink_dump_control c = { 2470 .dump = link->dump, 2471 .done = link->done, 2472 }; 2473 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c); 2474 } 2475 } 2476 2477 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, 2478 link->nla_max ? : XFRMA_MAX, 2479 link->nla_pol ? : xfrma_policy); 2480 if (err < 0) 2481 return err; 2482 2483 if (link->doit == NULL) 2484 return -EINVAL; 2485 2486 return link->doit(skb, nlh, attrs); 2487 } 2488 2489 static void xfrm_netlink_rcv(struct sk_buff *skb) 2490 { 2491 struct net *net = sock_net(skb->sk); 2492 2493 mutex_lock(&net->xfrm.xfrm_cfg_mutex); 2494 netlink_rcv_skb(skb, &xfrm_user_rcv_msg); 2495 mutex_unlock(&net->xfrm.xfrm_cfg_mutex); 2496 } 2497 2498 static inline size_t xfrm_expire_msgsize(void) 2499 { 2500 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire)) 2501 + nla_total_size(sizeof(struct xfrm_mark)); 2502 } 2503 2504 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 2505 { 2506 struct xfrm_user_expire *ue; 2507 struct nlmsghdr *nlh; 2508 int err; 2509 2510 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0); 2511 if (nlh == NULL) 2512 return -EMSGSIZE; 2513 2514 ue = nlmsg_data(nlh); 2515 copy_to_user_state(x, &ue->state); 2516 ue->hard = (c->data.hard != 0) ? 1 : 0; 2517 2518 err = xfrm_mark_put(skb, &x->mark); 2519 if (err) 2520 return err; 2521 2522 nlmsg_end(skb, nlh); 2523 return 0; 2524 } 2525 2526 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c) 2527 { 2528 struct net *net = xs_net(x); 2529 struct sk_buff *skb; 2530 2531 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC); 2532 if (skb == NULL) 2533 return -ENOMEM; 2534 2535 if (build_expire(skb, x, c) < 0) { 2536 kfree_skb(skb); 2537 return -EMSGSIZE; 2538 } 2539 2540 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE); 2541 } 2542 2543 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c) 2544 { 2545 struct net *net = xs_net(x); 2546 struct sk_buff *skb; 2547 2548 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 2549 if (skb == NULL) 2550 return -ENOMEM; 2551 2552 if (build_aevent(skb, x, c) < 0) 2553 BUG(); 2554 2555 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS); 2556 } 2557 2558 static int xfrm_notify_sa_flush(const struct km_event *c) 2559 { 2560 struct net *net = c->net; 2561 struct xfrm_usersa_flush *p; 2562 struct nlmsghdr *nlh; 2563 struct sk_buff *skb; 2564 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush)); 2565 2566 skb = nlmsg_new(len, GFP_ATOMIC); 2567 if (skb == NULL) 2568 return -ENOMEM; 2569 2570 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0); 2571 if (nlh == NULL) { 2572 kfree_skb(skb); 2573 return -EMSGSIZE; 2574 } 2575 2576 p = nlmsg_data(nlh); 2577 p->proto = c->data.proto; 2578 2579 nlmsg_end(skb, nlh); 2580 2581 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA); 2582 } 2583 2584 static inline size_t xfrm_sa_len(struct xfrm_state *x) 2585 { 2586 size_t l = 0; 2587 if (x->aead) 2588 l += nla_total_size(aead_len(x->aead)); 2589 if (x->aalg) { 2590 l += nla_total_size(sizeof(struct xfrm_algo) + 2591 (x->aalg->alg_key_len + 7) / 8); 2592 l += nla_total_size(xfrm_alg_auth_len(x->aalg)); 2593 } 2594 if (x->ealg) 2595 l += nla_total_size(xfrm_alg_len(x->ealg)); 2596 if (x->calg) 2597 l += nla_total_size(sizeof(*x->calg)); 2598 if (x->encap) 2599 l += nla_total_size(sizeof(*x->encap)); 2600 if (x->tfcpad) 2601 l += nla_total_size(sizeof(x->tfcpad)); 2602 if (x->replay_esn) 2603 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn)); 2604 else 2605 l += nla_total_size(sizeof(struct xfrm_replay_state)); 2606 if (x->security) 2607 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) + 2608 x->security->ctx_len); 2609 if (x->coaddr) 2610 l += nla_total_size(sizeof(*x->coaddr)); 2611 if (x->props.extra_flags) 2612 l += nla_total_size(sizeof(x->props.extra_flags)); 2613 2614 /* Must count x->lastused as it may become non-zero behind our back. */ 2615 l += nla_total_size(sizeof(u64)); 2616 2617 return l; 2618 } 2619 2620 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c) 2621 { 2622 struct net *net = xs_net(x); 2623 struct xfrm_usersa_info *p; 2624 struct xfrm_usersa_id *id; 2625 struct nlmsghdr *nlh; 2626 struct sk_buff *skb; 2627 int len = xfrm_sa_len(x); 2628 int headlen, err; 2629 2630 headlen = sizeof(*p); 2631 if (c->event == XFRM_MSG_DELSA) { 2632 len += nla_total_size(headlen); 2633 headlen = sizeof(*id); 2634 len += nla_total_size(sizeof(struct xfrm_mark)); 2635 } 2636 len += NLMSG_ALIGN(headlen); 2637 2638 skb = nlmsg_new(len, GFP_ATOMIC); 2639 if (skb == NULL) 2640 return -ENOMEM; 2641 2642 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); 2643 err = -EMSGSIZE; 2644 if (nlh == NULL) 2645 goto out_free_skb; 2646 2647 p = nlmsg_data(nlh); 2648 if (c->event == XFRM_MSG_DELSA) { 2649 struct nlattr *attr; 2650 2651 id = nlmsg_data(nlh); 2652 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr)); 2653 id->spi = x->id.spi; 2654 id->family = x->props.family; 2655 id->proto = x->id.proto; 2656 2657 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p)); 2658 err = -EMSGSIZE; 2659 if (attr == NULL) 2660 goto out_free_skb; 2661 2662 p = nla_data(attr); 2663 } 2664 err = copy_to_user_state_extra(x, p, skb); 2665 if (err) 2666 goto out_free_skb; 2667 2668 nlmsg_end(skb, nlh); 2669 2670 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA); 2671 2672 out_free_skb: 2673 kfree_skb(skb); 2674 return err; 2675 } 2676 2677 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c) 2678 { 2679 2680 switch (c->event) { 2681 case XFRM_MSG_EXPIRE: 2682 return xfrm_exp_state_notify(x, c); 2683 case XFRM_MSG_NEWAE: 2684 return xfrm_aevent_state_notify(x, c); 2685 case XFRM_MSG_DELSA: 2686 case XFRM_MSG_UPDSA: 2687 case XFRM_MSG_NEWSA: 2688 return xfrm_notify_sa(x, c); 2689 case XFRM_MSG_FLUSHSA: 2690 return xfrm_notify_sa_flush(c); 2691 default: 2692 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n", 2693 c->event); 2694 break; 2695 } 2696 2697 return 0; 2698 2699 } 2700 2701 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x, 2702 struct xfrm_policy *xp) 2703 { 2704 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire)) 2705 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 2706 + nla_total_size(sizeof(struct xfrm_mark)) 2707 + nla_total_size(xfrm_user_sec_ctx_size(x->security)) 2708 + userpolicy_type_attrsize(); 2709 } 2710 2711 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x, 2712 struct xfrm_tmpl *xt, struct xfrm_policy *xp) 2713 { 2714 __u32 seq = xfrm_get_acqseq(); 2715 struct xfrm_user_acquire *ua; 2716 struct nlmsghdr *nlh; 2717 int err; 2718 2719 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0); 2720 if (nlh == NULL) 2721 return -EMSGSIZE; 2722 2723 ua = nlmsg_data(nlh); 2724 memcpy(&ua->id, &x->id, sizeof(ua->id)); 2725 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr)); 2726 memcpy(&ua->sel, &x->sel, sizeof(ua->sel)); 2727 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT); 2728 ua->aalgos = xt->aalgos; 2729 ua->ealgos = xt->ealgos; 2730 ua->calgos = xt->calgos; 2731 ua->seq = x->km.seq = seq; 2732 2733 err = copy_to_user_tmpl(xp, skb); 2734 if (!err) 2735 err = copy_to_user_state_sec_ctx(x, 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 2745 nlmsg_end(skb, nlh); 2746 return 0; 2747 } 2748 2749 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt, 2750 struct xfrm_policy *xp) 2751 { 2752 struct net *net = xs_net(x); 2753 struct sk_buff *skb; 2754 2755 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC); 2756 if (skb == NULL) 2757 return -ENOMEM; 2758 2759 if (build_acquire(skb, x, xt, xp) < 0) 2760 BUG(); 2761 2762 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE); 2763 } 2764 2765 /* User gives us xfrm_user_policy_info followed by an array of 0 2766 * or more templates. 2767 */ 2768 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt, 2769 u8 *data, int len, int *dir) 2770 { 2771 struct net *net = sock_net(sk); 2772 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data; 2773 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1); 2774 struct xfrm_policy *xp; 2775 int nr; 2776 2777 switch (sk->sk_family) { 2778 case AF_INET: 2779 if (opt != IP_XFRM_POLICY) { 2780 *dir = -EOPNOTSUPP; 2781 return NULL; 2782 } 2783 break; 2784 #if IS_ENABLED(CONFIG_IPV6) 2785 case AF_INET6: 2786 if (opt != IPV6_XFRM_POLICY) { 2787 *dir = -EOPNOTSUPP; 2788 return NULL; 2789 } 2790 break; 2791 #endif 2792 default: 2793 *dir = -EINVAL; 2794 return NULL; 2795 } 2796 2797 *dir = -EINVAL; 2798 2799 if (len < sizeof(*p) || 2800 verify_newpolicy_info(p)) 2801 return NULL; 2802 2803 nr = ((len - sizeof(*p)) / sizeof(*ut)); 2804 if (validate_tmpl(nr, ut, p->sel.family)) 2805 return NULL; 2806 2807 if (p->dir > XFRM_POLICY_OUT) 2808 return NULL; 2809 2810 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 2811 if (xp == NULL) { 2812 *dir = -ENOBUFS; 2813 return NULL; 2814 } 2815 2816 copy_from_user_policy(xp, p); 2817 xp->type = XFRM_POLICY_TYPE_MAIN; 2818 copy_templates(xp, ut, nr); 2819 2820 *dir = p->dir; 2821 2822 return xp; 2823 } 2824 2825 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp) 2826 { 2827 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire)) 2828 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 2829 + nla_total_size(xfrm_user_sec_ctx_size(xp->security)) 2830 + nla_total_size(sizeof(struct xfrm_mark)) 2831 + userpolicy_type_attrsize(); 2832 } 2833 2834 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp, 2835 int dir, const struct km_event *c) 2836 { 2837 struct xfrm_user_polexpire *upe; 2838 int hard = c->data.hard; 2839 struct nlmsghdr *nlh; 2840 int err; 2841 2842 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0); 2843 if (nlh == NULL) 2844 return -EMSGSIZE; 2845 2846 upe = nlmsg_data(nlh); 2847 copy_to_user_policy(xp, &upe->pol, dir); 2848 err = copy_to_user_tmpl(xp, skb); 2849 if (!err) 2850 err = copy_to_user_sec_ctx(xp, skb); 2851 if (!err) 2852 err = copy_to_user_policy_type(xp->type, skb); 2853 if (!err) 2854 err = xfrm_mark_put(skb, &xp->mark); 2855 if (err) { 2856 nlmsg_cancel(skb, nlh); 2857 return err; 2858 } 2859 upe->hard = !!hard; 2860 2861 nlmsg_end(skb, nlh); 2862 return 0; 2863 } 2864 2865 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 2866 { 2867 struct net *net = xp_net(xp); 2868 struct sk_buff *skb; 2869 2870 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC); 2871 if (skb == NULL) 2872 return -ENOMEM; 2873 2874 if (build_polexpire(skb, xp, dir, c) < 0) 2875 BUG(); 2876 2877 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE); 2878 } 2879 2880 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) 2881 { 2882 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); 2883 struct net *net = xp_net(xp); 2884 struct xfrm_userpolicy_info *p; 2885 struct xfrm_userpolicy_id *id; 2886 struct nlmsghdr *nlh; 2887 struct sk_buff *skb; 2888 int headlen, err; 2889 2890 headlen = sizeof(*p); 2891 if (c->event == XFRM_MSG_DELPOLICY) { 2892 len += nla_total_size(headlen); 2893 headlen = sizeof(*id); 2894 } 2895 len += userpolicy_type_attrsize(); 2896 len += nla_total_size(sizeof(struct xfrm_mark)); 2897 len += NLMSG_ALIGN(headlen); 2898 2899 skb = nlmsg_new(len, GFP_ATOMIC); 2900 if (skb == NULL) 2901 return -ENOMEM; 2902 2903 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); 2904 err = -EMSGSIZE; 2905 if (nlh == NULL) 2906 goto out_free_skb; 2907 2908 p = nlmsg_data(nlh); 2909 if (c->event == XFRM_MSG_DELPOLICY) { 2910 struct nlattr *attr; 2911 2912 id = nlmsg_data(nlh); 2913 memset(id, 0, sizeof(*id)); 2914 id->dir = dir; 2915 if (c->data.byid) 2916 id->index = xp->index; 2917 else 2918 memcpy(&id->sel, &xp->selector, sizeof(id->sel)); 2919 2920 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p)); 2921 err = -EMSGSIZE; 2922 if (attr == NULL) 2923 goto out_free_skb; 2924 2925 p = nla_data(attr); 2926 } 2927 2928 copy_to_user_policy(xp, p, dir); 2929 err = copy_to_user_tmpl(xp, skb); 2930 if (!err) 2931 err = copy_to_user_policy_type(xp->type, skb); 2932 if (!err) 2933 err = xfrm_mark_put(skb, &xp->mark); 2934 if (err) 2935 goto out_free_skb; 2936 2937 nlmsg_end(skb, nlh); 2938 2939 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 2940 2941 out_free_skb: 2942 kfree_skb(skb); 2943 return err; 2944 } 2945 2946 static int xfrm_notify_policy_flush(const struct km_event *c) 2947 { 2948 struct net *net = c->net; 2949 struct nlmsghdr *nlh; 2950 struct sk_buff *skb; 2951 int err; 2952 2953 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC); 2954 if (skb == NULL) 2955 return -ENOMEM; 2956 2957 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0); 2958 err = -EMSGSIZE; 2959 if (nlh == NULL) 2960 goto out_free_skb; 2961 err = copy_to_user_policy_type(c->data.type, skb); 2962 if (err) 2963 goto out_free_skb; 2964 2965 nlmsg_end(skb, nlh); 2966 2967 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 2968 2969 out_free_skb: 2970 kfree_skb(skb); 2971 return err; 2972 } 2973 2974 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 2975 { 2976 2977 switch (c->event) { 2978 case XFRM_MSG_NEWPOLICY: 2979 case XFRM_MSG_UPDPOLICY: 2980 case XFRM_MSG_DELPOLICY: 2981 return xfrm_notify_policy(xp, dir, c); 2982 case XFRM_MSG_FLUSHPOLICY: 2983 return xfrm_notify_policy_flush(c); 2984 case XFRM_MSG_POLEXPIRE: 2985 return xfrm_exp_policy_notify(xp, dir, c); 2986 default: 2987 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n", 2988 c->event); 2989 } 2990 2991 return 0; 2992 2993 } 2994 2995 static inline size_t xfrm_report_msgsize(void) 2996 { 2997 return NLMSG_ALIGN(sizeof(struct xfrm_user_report)); 2998 } 2999 3000 static int build_report(struct sk_buff *skb, u8 proto, 3001 struct xfrm_selector *sel, xfrm_address_t *addr) 3002 { 3003 struct xfrm_user_report *ur; 3004 struct nlmsghdr *nlh; 3005 3006 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0); 3007 if (nlh == NULL) 3008 return -EMSGSIZE; 3009 3010 ur = nlmsg_data(nlh); 3011 ur->proto = proto; 3012 memcpy(&ur->sel, sel, sizeof(ur->sel)); 3013 3014 if (addr) { 3015 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr); 3016 if (err) { 3017 nlmsg_cancel(skb, nlh); 3018 return err; 3019 } 3020 } 3021 nlmsg_end(skb, nlh); 3022 return 0; 3023 } 3024 3025 static int xfrm_send_report(struct net *net, u8 proto, 3026 struct xfrm_selector *sel, xfrm_address_t *addr) 3027 { 3028 struct sk_buff *skb; 3029 3030 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC); 3031 if (skb == NULL) 3032 return -ENOMEM; 3033 3034 if (build_report(skb, proto, sel, addr) < 0) 3035 BUG(); 3036 3037 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT); 3038 } 3039 3040 static inline size_t xfrm_mapping_msgsize(void) 3041 { 3042 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping)); 3043 } 3044 3045 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x, 3046 xfrm_address_t *new_saddr, __be16 new_sport) 3047 { 3048 struct xfrm_user_mapping *um; 3049 struct nlmsghdr *nlh; 3050 3051 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0); 3052 if (nlh == NULL) 3053 return -EMSGSIZE; 3054 3055 um = nlmsg_data(nlh); 3056 3057 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr)); 3058 um->id.spi = x->id.spi; 3059 um->id.family = x->props.family; 3060 um->id.proto = x->id.proto; 3061 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr)); 3062 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr)); 3063 um->new_sport = new_sport; 3064 um->old_sport = x->encap->encap_sport; 3065 um->reqid = x->props.reqid; 3066 3067 nlmsg_end(skb, nlh); 3068 return 0; 3069 } 3070 3071 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, 3072 __be16 sport) 3073 { 3074 struct net *net = xs_net(x); 3075 struct sk_buff *skb; 3076 3077 if (x->id.proto != IPPROTO_ESP) 3078 return -EINVAL; 3079 3080 if (!x->encap) 3081 return -EINVAL; 3082 3083 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC); 3084 if (skb == NULL) 3085 return -ENOMEM; 3086 3087 if (build_mapping(skb, x, ipaddr, sport) < 0) 3088 BUG(); 3089 3090 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING); 3091 } 3092 3093 static bool xfrm_is_alive(const struct km_event *c) 3094 { 3095 return (bool)xfrm_acquire_is_on(c->net); 3096 } 3097 3098 static struct xfrm_mgr netlink_mgr = { 3099 .id = "netlink", 3100 .notify = xfrm_send_state_notify, 3101 .acquire = xfrm_send_acquire, 3102 .compile_policy = xfrm_compile_policy, 3103 .notify_policy = xfrm_send_policy_notify, 3104 .report = xfrm_send_report, 3105 .migrate = xfrm_send_migrate, 3106 .new_mapping = xfrm_send_mapping, 3107 .is_alive = xfrm_is_alive, 3108 }; 3109 3110 static int __net_init xfrm_user_net_init(struct net *net) 3111 { 3112 struct sock *nlsk; 3113 struct netlink_kernel_cfg cfg = { 3114 .groups = XFRMNLGRP_MAX, 3115 .input = xfrm_netlink_rcv, 3116 }; 3117 3118 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg); 3119 if (nlsk == NULL) 3120 return -ENOMEM; 3121 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */ 3122 rcu_assign_pointer(net->xfrm.nlsk, nlsk); 3123 return 0; 3124 } 3125 3126 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list) 3127 { 3128 struct net *net; 3129 list_for_each_entry(net, net_exit_list, exit_list) 3130 RCU_INIT_POINTER(net->xfrm.nlsk, NULL); 3131 synchronize_net(); 3132 list_for_each_entry(net, net_exit_list, exit_list) 3133 netlink_kernel_release(net->xfrm.nlsk_stash); 3134 } 3135 3136 static struct pernet_operations xfrm_user_net_ops = { 3137 .init = xfrm_user_net_init, 3138 .exit_batch = xfrm_user_net_exit, 3139 }; 3140 3141 static int __init xfrm_user_init(void) 3142 { 3143 int rv; 3144 3145 printk(KERN_INFO "Initializing XFRM netlink socket\n"); 3146 3147 rv = register_pernet_subsys(&xfrm_user_net_ops); 3148 if (rv < 0) 3149 return rv; 3150 rv = xfrm_register_km(&netlink_mgr); 3151 if (rv < 0) 3152 unregister_pernet_subsys(&xfrm_user_net_ops); 3153 return rv; 3154 } 3155 3156 static void __exit xfrm_user_exit(void) 3157 { 3158 xfrm_unregister_km(&netlink_mgr); 3159 unregister_pernet_subsys(&xfrm_user_net_ops); 3160 } 3161 3162 module_init(xfrm_user_init); 3163 module_exit(xfrm_user_exit); 3164 MODULE_LICENSE("GPL"); 3165 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM); 3166 3167