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