1 /* xfrm_user.c: User interface to configure xfrm engine. 2 * 3 * Copyright (C) 2002 David S. Miller (davem@redhat.com) 4 * 5 * Changes: 6 * Mitsuru KANDA @USAGI 7 * Kazunori MIYAZAWA @USAGI 8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com> 9 * IPv6 support 10 * 11 */ 12 13 #include <linux/crypto.h> 14 #include <linux/module.h> 15 #include <linux/kernel.h> 16 #include <linux/types.h> 17 #include <linux/slab.h> 18 #include <linux/socket.h> 19 #include <linux/string.h> 20 #include <linux/net.h> 21 #include <linux/skbuff.h> 22 #include <linux/pfkeyv2.h> 23 #include <linux/ipsec.h> 24 #include <linux/init.h> 25 #include <linux/security.h> 26 #include <net/sock.h> 27 #include <net/xfrm.h> 28 #include <net/netlink.h> 29 #include <net/ah.h> 30 #include <linux/uaccess.h> 31 #if IS_ENABLED(CONFIG_IPV6) 32 #include <linux/in6.h> 33 #endif 34 #include <asm/unaligned.h> 35 36 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type) 37 { 38 struct nlattr *rt = attrs[type]; 39 struct xfrm_algo *algp; 40 41 if (!rt) 42 return 0; 43 44 algp = nla_data(rt); 45 if (nla_len(rt) < xfrm_alg_len(algp)) 46 return -EINVAL; 47 48 switch (type) { 49 case XFRMA_ALG_AUTH: 50 case XFRMA_ALG_CRYPT: 51 case XFRMA_ALG_COMP: 52 break; 53 54 default: 55 return -EINVAL; 56 } 57 58 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; 59 return 0; 60 } 61 62 static int verify_auth_trunc(struct nlattr **attrs) 63 { 64 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC]; 65 struct xfrm_algo_auth *algp; 66 67 if (!rt) 68 return 0; 69 70 algp = nla_data(rt); 71 if (nla_len(rt) < xfrm_alg_auth_len(algp)) 72 return -EINVAL; 73 74 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; 75 return 0; 76 } 77 78 static int verify_aead(struct nlattr **attrs) 79 { 80 struct nlattr *rt = attrs[XFRMA_ALG_AEAD]; 81 struct xfrm_algo_aead *algp; 82 83 if (!rt) 84 return 0; 85 86 algp = nla_data(rt); 87 if (nla_len(rt) < aead_len(algp)) 88 return -EINVAL; 89 90 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; 91 return 0; 92 } 93 94 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type, 95 xfrm_address_t **addrp) 96 { 97 struct nlattr *rt = attrs[type]; 98 99 if (rt && addrp) 100 *addrp = nla_data(rt); 101 } 102 103 static inline int verify_sec_ctx_len(struct nlattr **attrs) 104 { 105 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 106 struct xfrm_user_sec_ctx *uctx; 107 108 if (!rt) 109 return 0; 110 111 uctx = nla_data(rt); 112 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len)) 113 return -EINVAL; 114 115 return 0; 116 } 117 118 static inline int verify_replay(struct xfrm_usersa_info *p, 119 struct nlattr **attrs) 120 { 121 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL]; 122 struct xfrm_replay_state_esn *rs; 123 124 if (p->flags & XFRM_STATE_ESN) { 125 if (!rt) 126 return -EINVAL; 127 128 rs = nla_data(rt); 129 130 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8) 131 return -EINVAL; 132 133 if (nla_len(rt) < xfrm_replay_state_esn_len(rs) && 134 nla_len(rt) != sizeof(*rs)) 135 return -EINVAL; 136 } 137 138 if (!rt) 139 return 0; 140 141 /* As only ESP and AH support ESN feature. */ 142 if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH)) 143 return -EINVAL; 144 145 if (p->replay_window != 0) 146 return -EINVAL; 147 148 return 0; 149 } 150 151 static int verify_newsa_info(struct xfrm_usersa_info *p, 152 struct nlattr **attrs) 153 { 154 int err; 155 156 err = -EINVAL; 157 switch (p->family) { 158 case AF_INET: 159 break; 160 161 case AF_INET6: 162 #if IS_ENABLED(CONFIG_IPV6) 163 break; 164 #else 165 err = -EAFNOSUPPORT; 166 goto out; 167 #endif 168 169 default: 170 goto out; 171 } 172 173 err = -EINVAL; 174 switch (p->id.proto) { 175 case IPPROTO_AH: 176 if ((!attrs[XFRMA_ALG_AUTH] && 177 !attrs[XFRMA_ALG_AUTH_TRUNC]) || 178 attrs[XFRMA_ALG_AEAD] || 179 attrs[XFRMA_ALG_CRYPT] || 180 attrs[XFRMA_ALG_COMP] || 181 attrs[XFRMA_TFCPAD]) 182 goto out; 183 break; 184 185 case IPPROTO_ESP: 186 if (attrs[XFRMA_ALG_COMP]) 187 goto out; 188 if (!attrs[XFRMA_ALG_AUTH] && 189 !attrs[XFRMA_ALG_AUTH_TRUNC] && 190 !attrs[XFRMA_ALG_CRYPT] && 191 !attrs[XFRMA_ALG_AEAD]) 192 goto out; 193 if ((attrs[XFRMA_ALG_AUTH] || 194 attrs[XFRMA_ALG_AUTH_TRUNC] || 195 attrs[XFRMA_ALG_CRYPT]) && 196 attrs[XFRMA_ALG_AEAD]) 197 goto out; 198 if (attrs[XFRMA_TFCPAD] && 199 p->mode != XFRM_MODE_TUNNEL) 200 goto out; 201 break; 202 203 case IPPROTO_COMP: 204 if (!attrs[XFRMA_ALG_COMP] || 205 attrs[XFRMA_ALG_AEAD] || 206 attrs[XFRMA_ALG_AUTH] || 207 attrs[XFRMA_ALG_AUTH_TRUNC] || 208 attrs[XFRMA_ALG_CRYPT] || 209 attrs[XFRMA_TFCPAD] || 210 (ntohl(p->id.spi) >= 0x10000)) 211 goto out; 212 break; 213 214 #if IS_ENABLED(CONFIG_IPV6) 215 case IPPROTO_DSTOPTS: 216 case IPPROTO_ROUTING: 217 if (attrs[XFRMA_ALG_COMP] || 218 attrs[XFRMA_ALG_AUTH] || 219 attrs[XFRMA_ALG_AUTH_TRUNC] || 220 attrs[XFRMA_ALG_AEAD] || 221 attrs[XFRMA_ALG_CRYPT] || 222 attrs[XFRMA_ENCAP] || 223 attrs[XFRMA_SEC_CTX] || 224 attrs[XFRMA_TFCPAD] || 225 !attrs[XFRMA_COADDR]) 226 goto out; 227 break; 228 #endif 229 230 default: 231 goto out; 232 } 233 234 if ((err = verify_aead(attrs))) 235 goto out; 236 if ((err = verify_auth_trunc(attrs))) 237 goto out; 238 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH))) 239 goto out; 240 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT))) 241 goto out; 242 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP))) 243 goto out; 244 if ((err = verify_sec_ctx_len(attrs))) 245 goto out; 246 if ((err = verify_replay(p, attrs))) 247 goto out; 248 249 err = -EINVAL; 250 switch (p->mode) { 251 case XFRM_MODE_TRANSPORT: 252 case XFRM_MODE_TUNNEL: 253 case XFRM_MODE_ROUTEOPTIMIZATION: 254 case XFRM_MODE_BEET: 255 break; 256 257 default: 258 goto out; 259 } 260 261 err = 0; 262 263 out: 264 return err; 265 } 266 267 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props, 268 struct xfrm_algo_desc *(*get_byname)(const char *, int), 269 struct nlattr *rta) 270 { 271 struct xfrm_algo *p, *ualg; 272 struct xfrm_algo_desc *algo; 273 274 if (!rta) 275 return 0; 276 277 ualg = nla_data(rta); 278 279 algo = get_byname(ualg->alg_name, 1); 280 if (!algo) 281 return -ENOSYS; 282 *props = algo->desc.sadb_alg_id; 283 284 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL); 285 if (!p) 286 return -ENOMEM; 287 288 strcpy(p->alg_name, algo->name); 289 *algpp = p; 290 return 0; 291 } 292 293 static int attach_crypt(struct xfrm_state *x, struct nlattr *rta) 294 { 295 struct xfrm_algo *p, *ualg; 296 struct xfrm_algo_desc *algo; 297 298 if (!rta) 299 return 0; 300 301 ualg = nla_data(rta); 302 303 algo = xfrm_ealg_get_byname(ualg->alg_name, 1); 304 if (!algo) 305 return -ENOSYS; 306 x->props.ealgo = algo->desc.sadb_alg_id; 307 308 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL); 309 if (!p) 310 return -ENOMEM; 311 312 strcpy(p->alg_name, algo->name); 313 x->ealg = p; 314 x->geniv = algo->uinfo.encr.geniv; 315 return 0; 316 } 317 318 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props, 319 struct nlattr *rta) 320 { 321 struct xfrm_algo *ualg; 322 struct xfrm_algo_auth *p; 323 struct xfrm_algo_desc *algo; 324 325 if (!rta) 326 return 0; 327 328 ualg = nla_data(rta); 329 330 algo = xfrm_aalg_get_byname(ualg->alg_name, 1); 331 if (!algo) 332 return -ENOSYS; 333 *props = algo->desc.sadb_alg_id; 334 335 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL); 336 if (!p) 337 return -ENOMEM; 338 339 strcpy(p->alg_name, algo->name); 340 p->alg_key_len = ualg->alg_key_len; 341 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; 342 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8); 343 344 *algpp = p; 345 return 0; 346 } 347 348 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props, 349 struct nlattr *rta) 350 { 351 struct xfrm_algo_auth *p, *ualg; 352 struct xfrm_algo_desc *algo; 353 354 if (!rta) 355 return 0; 356 357 ualg = nla_data(rta); 358 359 algo = xfrm_aalg_get_byname(ualg->alg_name, 1); 360 if (!algo) 361 return -ENOSYS; 362 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits) 363 return -EINVAL; 364 *props = algo->desc.sadb_alg_id; 365 366 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL); 367 if (!p) 368 return -ENOMEM; 369 370 strcpy(p->alg_name, algo->name); 371 if (!p->alg_trunc_len) 372 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; 373 374 *algpp = p; 375 return 0; 376 } 377 378 static int attach_aead(struct xfrm_state *x, struct nlattr *rta) 379 { 380 struct xfrm_algo_aead *p, *ualg; 381 struct xfrm_algo_desc *algo; 382 383 if (!rta) 384 return 0; 385 386 ualg = nla_data(rta); 387 388 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1); 389 if (!algo) 390 return -ENOSYS; 391 x->props.ealgo = algo->desc.sadb_alg_id; 392 393 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL); 394 if (!p) 395 return -ENOMEM; 396 397 strcpy(p->alg_name, algo->name); 398 x->aead = p; 399 x->geniv = algo->uinfo.aead.geniv; 400 return 0; 401 } 402 403 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn, 404 struct nlattr *rp) 405 { 406 struct xfrm_replay_state_esn *up; 407 int ulen; 408 409 if (!replay_esn || !rp) 410 return 0; 411 412 up = nla_data(rp); 413 ulen = xfrm_replay_state_esn_len(up); 414 415 /* Check the overall length and the internal bitmap length to avoid 416 * potential overflow. */ 417 if (nla_len(rp) < ulen || 418 xfrm_replay_state_esn_len(replay_esn) != ulen || 419 replay_esn->bmp_len != up->bmp_len) 420 return -EINVAL; 421 422 if (up->replay_window > up->bmp_len * sizeof(__u32) * 8) 423 return -EINVAL; 424 425 return 0; 426 } 427 428 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn, 429 struct xfrm_replay_state_esn **preplay_esn, 430 struct nlattr *rta) 431 { 432 struct xfrm_replay_state_esn *p, *pp, *up; 433 int klen, ulen; 434 435 if (!rta) 436 return 0; 437 438 up = nla_data(rta); 439 klen = xfrm_replay_state_esn_len(up); 440 ulen = nla_len(rta) >= klen ? klen : sizeof(*up); 441 442 p = kzalloc(klen, GFP_KERNEL); 443 if (!p) 444 return -ENOMEM; 445 446 pp = kzalloc(klen, GFP_KERNEL); 447 if (!pp) { 448 kfree(p); 449 return -ENOMEM; 450 } 451 452 memcpy(p, up, ulen); 453 memcpy(pp, up, ulen); 454 455 *replay_esn = p; 456 *preplay_esn = pp; 457 458 return 0; 459 } 460 461 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx) 462 { 463 int len = 0; 464 465 if (xfrm_ctx) { 466 len += sizeof(struct xfrm_user_sec_ctx); 467 len += xfrm_ctx->ctx_len; 468 } 469 return len; 470 } 471 472 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 473 { 474 memcpy(&x->id, &p->id, sizeof(x->id)); 475 memcpy(&x->sel, &p->sel, sizeof(x->sel)); 476 memcpy(&x->lft, &p->lft, sizeof(x->lft)); 477 x->props.mode = p->mode; 478 x->props.replay_window = min_t(unsigned int, p->replay_window, 479 sizeof(x->replay.bitmap) * 8); 480 x->props.reqid = p->reqid; 481 x->props.family = p->family; 482 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr)); 483 x->props.flags = p->flags; 484 485 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC)) 486 x->sel.family = p->family; 487 } 488 489 /* 490 * someday when pfkey also has support, we could have the code 491 * somehow made shareable and move it to xfrm_state.c - JHS 492 * 493 */ 494 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs, 495 int update_esn) 496 { 497 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 498 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL; 499 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 500 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; 501 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; 502 503 if (re) { 504 struct xfrm_replay_state_esn *replay_esn; 505 replay_esn = nla_data(re); 506 memcpy(x->replay_esn, replay_esn, 507 xfrm_replay_state_esn_len(replay_esn)); 508 memcpy(x->preplay_esn, replay_esn, 509 xfrm_replay_state_esn_len(replay_esn)); 510 } 511 512 if (rp) { 513 struct xfrm_replay_state *replay; 514 replay = nla_data(rp); 515 memcpy(&x->replay, replay, sizeof(*replay)); 516 memcpy(&x->preplay, replay, sizeof(*replay)); 517 } 518 519 if (lt) { 520 struct xfrm_lifetime_cur *ltime; 521 ltime = nla_data(lt); 522 x->curlft.bytes = ltime->bytes; 523 x->curlft.packets = ltime->packets; 524 x->curlft.add_time = ltime->add_time; 525 x->curlft.use_time = ltime->use_time; 526 } 527 528 if (et) 529 x->replay_maxage = nla_get_u32(et); 530 531 if (rt) 532 x->replay_maxdiff = nla_get_u32(rt); 533 } 534 535 static struct xfrm_state *xfrm_state_construct(struct net *net, 536 struct xfrm_usersa_info *p, 537 struct nlattr **attrs, 538 int *errp) 539 { 540 struct xfrm_state *x = xfrm_state_alloc(net); 541 int err = -ENOMEM; 542 543 if (!x) 544 goto error_no_put; 545 546 copy_from_user_state(x, p); 547 548 if (attrs[XFRMA_SA_EXTRA_FLAGS]) 549 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]); 550 551 if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD]))) 552 goto error; 553 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo, 554 attrs[XFRMA_ALG_AUTH_TRUNC]))) 555 goto error; 556 if (!x->props.aalgo) { 557 if ((err = attach_auth(&x->aalg, &x->props.aalgo, 558 attrs[XFRMA_ALG_AUTH]))) 559 goto error; 560 } 561 if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT]))) 562 goto error; 563 if ((err = attach_one_algo(&x->calg, &x->props.calgo, 564 xfrm_calg_get_byname, 565 attrs[XFRMA_ALG_COMP]))) 566 goto error; 567 568 if (attrs[XFRMA_ENCAP]) { 569 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]), 570 sizeof(*x->encap), GFP_KERNEL); 571 if (x->encap == NULL) 572 goto error; 573 } 574 575 if (attrs[XFRMA_TFCPAD]) 576 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]); 577 578 if (attrs[XFRMA_COADDR]) { 579 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]), 580 sizeof(*x->coaddr), GFP_KERNEL); 581 if (x->coaddr == NULL) 582 goto error; 583 } 584 585 xfrm_mark_get(attrs, &x->mark); 586 587 err = __xfrm_init_state(x, false); 588 if (err) 589 goto error; 590 591 if (attrs[XFRMA_SEC_CTX]) { 592 err = security_xfrm_state_alloc(x, 593 nla_data(attrs[XFRMA_SEC_CTX])); 594 if (err) 595 goto error; 596 } 597 598 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn, 599 attrs[XFRMA_REPLAY_ESN_VAL]))) 600 goto error; 601 602 x->km.seq = p->seq; 603 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth; 604 /* sysctl_xfrm_aevent_etime is in 100ms units */ 605 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M; 606 607 if ((err = xfrm_init_replay(x))) 608 goto error; 609 610 /* override default values from above */ 611 xfrm_update_ae_params(x, attrs, 0); 612 613 return x; 614 615 error: 616 x->km.state = XFRM_STATE_DEAD; 617 xfrm_state_put(x); 618 error_no_put: 619 *errp = err; 620 return NULL; 621 } 622 623 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 624 struct nlattr **attrs) 625 { 626 struct net *net = sock_net(skb->sk); 627 struct xfrm_usersa_info *p = nlmsg_data(nlh); 628 struct xfrm_state *x; 629 int err; 630 struct km_event c; 631 632 err = verify_newsa_info(p, attrs); 633 if (err) 634 return err; 635 636 x = xfrm_state_construct(net, p, attrs, &err); 637 if (!x) 638 return err; 639 640 xfrm_state_hold(x); 641 if (nlh->nlmsg_type == XFRM_MSG_NEWSA) 642 err = xfrm_state_add(x); 643 else 644 err = xfrm_state_update(x); 645 646 xfrm_audit_state_add(x, err ? 0 : 1, true); 647 648 if (err < 0) { 649 x->km.state = XFRM_STATE_DEAD; 650 __xfrm_state_put(x); 651 goto out; 652 } 653 654 c.seq = nlh->nlmsg_seq; 655 c.portid = nlh->nlmsg_pid; 656 c.event = nlh->nlmsg_type; 657 658 km_state_notify(x, &c); 659 out: 660 xfrm_state_put(x); 661 return err; 662 } 663 664 static struct xfrm_state *xfrm_user_state_lookup(struct net *net, 665 struct xfrm_usersa_id *p, 666 struct nlattr **attrs, 667 int *errp) 668 { 669 struct xfrm_state *x = NULL; 670 struct xfrm_mark m; 671 int err; 672 u32 mark = xfrm_mark_get(attrs, &m); 673 674 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) { 675 err = -ESRCH; 676 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family); 677 } else { 678 xfrm_address_t *saddr = NULL; 679 680 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr); 681 if (!saddr) { 682 err = -EINVAL; 683 goto out; 684 } 685 686 err = -ESRCH; 687 x = xfrm_state_lookup_byaddr(net, mark, 688 &p->daddr, saddr, 689 p->proto, p->family); 690 } 691 692 out: 693 if (!x && errp) 694 *errp = err; 695 return x; 696 } 697 698 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 699 struct nlattr **attrs) 700 { 701 struct net *net = sock_net(skb->sk); 702 struct xfrm_state *x; 703 int err = -ESRCH; 704 struct km_event c; 705 struct xfrm_usersa_id *p = nlmsg_data(nlh); 706 707 x = xfrm_user_state_lookup(net, p, attrs, &err); 708 if (x == NULL) 709 return err; 710 711 if ((err = security_xfrm_state_delete(x)) != 0) 712 goto out; 713 714 if (xfrm_state_kern(x)) { 715 err = -EPERM; 716 goto out; 717 } 718 719 err = xfrm_state_delete(x); 720 721 if (err < 0) 722 goto out; 723 724 c.seq = nlh->nlmsg_seq; 725 c.portid = nlh->nlmsg_pid; 726 c.event = nlh->nlmsg_type; 727 km_state_notify(x, &c); 728 729 out: 730 xfrm_audit_state_delete(x, err ? 0 : 1, true); 731 xfrm_state_put(x); 732 return err; 733 } 734 735 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 736 { 737 memset(p, 0, sizeof(*p)); 738 memcpy(&p->id, &x->id, sizeof(p->id)); 739 memcpy(&p->sel, &x->sel, sizeof(p->sel)); 740 memcpy(&p->lft, &x->lft, sizeof(p->lft)); 741 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft)); 742 put_unaligned(x->stats.replay_window, &p->stats.replay_window); 743 put_unaligned(x->stats.replay, &p->stats.replay); 744 put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed); 745 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr)); 746 p->mode = x->props.mode; 747 p->replay_window = x->props.replay_window; 748 p->reqid = x->props.reqid; 749 p->family = x->props.family; 750 p->flags = x->props.flags; 751 p->seq = x->km.seq; 752 } 753 754 struct xfrm_dump_info { 755 struct sk_buff *in_skb; 756 struct sk_buff *out_skb; 757 u32 nlmsg_seq; 758 u16 nlmsg_flags; 759 }; 760 761 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb) 762 { 763 struct xfrm_user_sec_ctx *uctx; 764 struct nlattr *attr; 765 int ctx_size = sizeof(*uctx) + s->ctx_len; 766 767 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size); 768 if (attr == NULL) 769 return -EMSGSIZE; 770 771 uctx = nla_data(attr); 772 uctx->exttype = XFRMA_SEC_CTX; 773 uctx->len = ctx_size; 774 uctx->ctx_doi = s->ctx_doi; 775 uctx->ctx_alg = s->ctx_alg; 776 uctx->ctx_len = s->ctx_len; 777 memcpy(uctx + 1, s->ctx_str, s->ctx_len); 778 779 return 0; 780 } 781 782 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb) 783 { 784 struct xfrm_algo *algo; 785 struct nlattr *nla; 786 787 nla = nla_reserve(skb, XFRMA_ALG_AUTH, 788 sizeof(*algo) + (auth->alg_key_len + 7) / 8); 789 if (!nla) 790 return -EMSGSIZE; 791 792 algo = nla_data(nla); 793 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name)); 794 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8); 795 algo->alg_key_len = auth->alg_key_len; 796 797 return 0; 798 } 799 800 /* Don't change this without updating xfrm_sa_len! */ 801 static int copy_to_user_state_extra(struct xfrm_state *x, 802 struct xfrm_usersa_info *p, 803 struct sk_buff *skb) 804 { 805 int ret = 0; 806 807 copy_to_user_state(x, p); 808 809 if (x->props.extra_flags) { 810 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS, 811 x->props.extra_flags); 812 if (ret) 813 goto out; 814 } 815 816 if (x->coaddr) { 817 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr); 818 if (ret) 819 goto out; 820 } 821 if (x->lastused) { 822 ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused, 823 XFRMA_PAD); 824 if (ret) 825 goto out; 826 } 827 if (x->aead) { 828 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead); 829 if (ret) 830 goto out; 831 } 832 if (x->aalg) { 833 ret = copy_to_user_auth(x->aalg, skb); 834 if (!ret) 835 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC, 836 xfrm_alg_auth_len(x->aalg), x->aalg); 837 if (ret) 838 goto out; 839 } 840 if (x->ealg) { 841 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg); 842 if (ret) 843 goto out; 844 } 845 if (x->calg) { 846 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg); 847 if (ret) 848 goto out; 849 } 850 if (x->encap) { 851 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap); 852 if (ret) 853 goto out; 854 } 855 if (x->tfcpad) { 856 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad); 857 if (ret) 858 goto out; 859 } 860 ret = xfrm_mark_put(skb, &x->mark); 861 if (ret) 862 goto out; 863 if (x->replay_esn) 864 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL, 865 xfrm_replay_state_esn_len(x->replay_esn), 866 x->replay_esn); 867 else 868 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), 869 &x->replay); 870 if (ret) 871 goto out; 872 if (x->security) 873 ret = copy_sec_ctx(x->security, skb); 874 out: 875 return ret; 876 } 877 878 static int dump_one_state(struct xfrm_state *x, int count, void *ptr) 879 { 880 struct xfrm_dump_info *sp = ptr; 881 struct sk_buff *in_skb = sp->in_skb; 882 struct sk_buff *skb = sp->out_skb; 883 struct xfrm_usersa_info *p; 884 struct nlmsghdr *nlh; 885 int err; 886 887 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, 888 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags); 889 if (nlh == NULL) 890 return -EMSGSIZE; 891 892 p = nlmsg_data(nlh); 893 894 err = copy_to_user_state_extra(x, p, skb); 895 if (err) { 896 nlmsg_cancel(skb, nlh); 897 return err; 898 } 899 nlmsg_end(skb, nlh); 900 return 0; 901 } 902 903 static int xfrm_dump_sa_done(struct netlink_callback *cb) 904 { 905 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 906 struct sock *sk = cb->skb->sk; 907 struct net *net = sock_net(sk); 908 909 if (cb->args[0]) 910 xfrm_state_walk_done(walk, net); 911 return 0; 912 } 913 914 static const struct nla_policy xfrma_policy[XFRMA_MAX+1]; 915 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb) 916 { 917 struct net *net = sock_net(skb->sk); 918 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 919 struct xfrm_dump_info info; 920 921 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) > 922 sizeof(cb->args) - sizeof(cb->args[0])); 923 924 info.in_skb = cb->skb; 925 info.out_skb = skb; 926 info.nlmsg_seq = cb->nlh->nlmsg_seq; 927 info.nlmsg_flags = NLM_F_MULTI; 928 929 if (!cb->args[0]) { 930 struct nlattr *attrs[XFRMA_MAX+1]; 931 struct xfrm_address_filter *filter = NULL; 932 u8 proto = 0; 933 int err; 934 935 err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX, 936 xfrma_policy); 937 if (err < 0) 938 return err; 939 940 if (attrs[XFRMA_ADDRESS_FILTER]) { 941 filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]), 942 sizeof(*filter), GFP_KERNEL); 943 if (filter == NULL) 944 return -ENOMEM; 945 } 946 947 if (attrs[XFRMA_PROTO]) 948 proto = nla_get_u8(attrs[XFRMA_PROTO]); 949 950 xfrm_state_walk_init(walk, proto, filter); 951 cb->args[0] = 1; 952 } 953 954 (void) xfrm_state_walk(net, walk, dump_one_state, &info); 955 956 return skb->len; 957 } 958 959 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb, 960 struct xfrm_state *x, u32 seq) 961 { 962 struct xfrm_dump_info info; 963 struct sk_buff *skb; 964 int err; 965 966 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 967 if (!skb) 968 return ERR_PTR(-ENOMEM); 969 970 info.in_skb = in_skb; 971 info.out_skb = skb; 972 info.nlmsg_seq = seq; 973 info.nlmsg_flags = 0; 974 975 err = dump_one_state(x, 0, &info); 976 if (err) { 977 kfree_skb(skb); 978 return ERR_PTR(err); 979 } 980 981 return skb; 982 } 983 984 /* A wrapper for nlmsg_multicast() checking that nlsk is still available. 985 * Must be called with RCU read lock. 986 */ 987 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb, 988 u32 pid, unsigned int group) 989 { 990 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk); 991 992 if (nlsk) 993 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC); 994 else 995 return -1; 996 } 997 998 static inline size_t xfrm_spdinfo_msgsize(void) 999 { 1000 return NLMSG_ALIGN(4) 1001 + nla_total_size(sizeof(struct xfrmu_spdinfo)) 1002 + nla_total_size(sizeof(struct xfrmu_spdhinfo)) 1003 + nla_total_size(sizeof(struct xfrmu_spdhthresh)) 1004 + nla_total_size(sizeof(struct xfrmu_spdhthresh)); 1005 } 1006 1007 static int build_spdinfo(struct sk_buff *skb, struct net *net, 1008 u32 portid, u32 seq, u32 flags) 1009 { 1010 struct xfrmk_spdinfo si; 1011 struct xfrmu_spdinfo spc; 1012 struct xfrmu_spdhinfo sph; 1013 struct xfrmu_spdhthresh spt4, spt6; 1014 struct nlmsghdr *nlh; 1015 int err; 1016 u32 *f; 1017 unsigned lseq; 1018 1019 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0); 1020 if (nlh == NULL) /* shouldn't really happen ... */ 1021 return -EMSGSIZE; 1022 1023 f = nlmsg_data(nlh); 1024 *f = flags; 1025 xfrm_spd_getinfo(net, &si); 1026 spc.incnt = si.incnt; 1027 spc.outcnt = si.outcnt; 1028 spc.fwdcnt = si.fwdcnt; 1029 spc.inscnt = si.inscnt; 1030 spc.outscnt = si.outscnt; 1031 spc.fwdscnt = si.fwdscnt; 1032 sph.spdhcnt = si.spdhcnt; 1033 sph.spdhmcnt = si.spdhmcnt; 1034 1035 do { 1036 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock); 1037 1038 spt4.lbits = net->xfrm.policy_hthresh.lbits4; 1039 spt4.rbits = net->xfrm.policy_hthresh.rbits4; 1040 spt6.lbits = net->xfrm.policy_hthresh.lbits6; 1041 spt6.rbits = net->xfrm.policy_hthresh.rbits6; 1042 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq)); 1043 1044 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc); 1045 if (!err) 1046 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph); 1047 if (!err) 1048 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4); 1049 if (!err) 1050 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6); 1051 if (err) { 1052 nlmsg_cancel(skb, nlh); 1053 return err; 1054 } 1055 1056 nlmsg_end(skb, nlh); 1057 return 0; 1058 } 1059 1060 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1061 struct nlattr **attrs) 1062 { 1063 struct net *net = sock_net(skb->sk); 1064 struct xfrmu_spdhthresh *thresh4 = NULL; 1065 struct xfrmu_spdhthresh *thresh6 = NULL; 1066 1067 /* selector prefixlen thresholds to hash policies */ 1068 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) { 1069 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH]; 1070 1071 if (nla_len(rta) < sizeof(*thresh4)) 1072 return -EINVAL; 1073 thresh4 = nla_data(rta); 1074 if (thresh4->lbits > 32 || thresh4->rbits > 32) 1075 return -EINVAL; 1076 } 1077 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) { 1078 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH]; 1079 1080 if (nla_len(rta) < sizeof(*thresh6)) 1081 return -EINVAL; 1082 thresh6 = nla_data(rta); 1083 if (thresh6->lbits > 128 || thresh6->rbits > 128) 1084 return -EINVAL; 1085 } 1086 1087 if (thresh4 || thresh6) { 1088 write_seqlock(&net->xfrm.policy_hthresh.lock); 1089 if (thresh4) { 1090 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits; 1091 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits; 1092 } 1093 if (thresh6) { 1094 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits; 1095 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits; 1096 } 1097 write_sequnlock(&net->xfrm.policy_hthresh.lock); 1098 1099 xfrm_policy_hash_rebuild(net); 1100 } 1101 1102 return 0; 1103 } 1104 1105 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1106 struct nlattr **attrs) 1107 { 1108 struct net *net = sock_net(skb->sk); 1109 struct sk_buff *r_skb; 1110 u32 *flags = nlmsg_data(nlh); 1111 u32 sportid = NETLINK_CB(skb).portid; 1112 u32 seq = nlh->nlmsg_seq; 1113 1114 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC); 1115 if (r_skb == NULL) 1116 return -ENOMEM; 1117 1118 if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0) 1119 BUG(); 1120 1121 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); 1122 } 1123 1124 static inline size_t xfrm_sadinfo_msgsize(void) 1125 { 1126 return NLMSG_ALIGN(4) 1127 + nla_total_size(sizeof(struct xfrmu_sadhinfo)) 1128 + nla_total_size(4); /* XFRMA_SAD_CNT */ 1129 } 1130 1131 static int build_sadinfo(struct sk_buff *skb, struct net *net, 1132 u32 portid, u32 seq, u32 flags) 1133 { 1134 struct xfrmk_sadinfo si; 1135 struct xfrmu_sadhinfo sh; 1136 struct nlmsghdr *nlh; 1137 int err; 1138 u32 *f; 1139 1140 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0); 1141 if (nlh == NULL) /* shouldn't really happen ... */ 1142 return -EMSGSIZE; 1143 1144 f = nlmsg_data(nlh); 1145 *f = flags; 1146 xfrm_sad_getinfo(net, &si); 1147 1148 sh.sadhmcnt = si.sadhmcnt; 1149 sh.sadhcnt = si.sadhcnt; 1150 1151 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt); 1152 if (!err) 1153 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh); 1154 if (err) { 1155 nlmsg_cancel(skb, nlh); 1156 return err; 1157 } 1158 1159 nlmsg_end(skb, nlh); 1160 return 0; 1161 } 1162 1163 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1164 struct nlattr **attrs) 1165 { 1166 struct net *net = sock_net(skb->sk); 1167 struct sk_buff *r_skb; 1168 u32 *flags = nlmsg_data(nlh); 1169 u32 sportid = NETLINK_CB(skb).portid; 1170 u32 seq = nlh->nlmsg_seq; 1171 1172 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC); 1173 if (r_skb == NULL) 1174 return -ENOMEM; 1175 1176 if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0) 1177 BUG(); 1178 1179 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); 1180 } 1181 1182 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 1183 struct nlattr **attrs) 1184 { 1185 struct net *net = sock_net(skb->sk); 1186 struct xfrm_usersa_id *p = nlmsg_data(nlh); 1187 struct xfrm_state *x; 1188 struct sk_buff *resp_skb; 1189 int err = -ESRCH; 1190 1191 x = xfrm_user_state_lookup(net, p, attrs, &err); 1192 if (x == NULL) 1193 goto out_noput; 1194 1195 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 1196 if (IS_ERR(resp_skb)) { 1197 err = PTR_ERR(resp_skb); 1198 } else { 1199 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); 1200 } 1201 xfrm_state_put(x); 1202 out_noput: 1203 return err; 1204 } 1205 1206 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, 1207 struct nlattr **attrs) 1208 { 1209 struct net *net = sock_net(skb->sk); 1210 struct xfrm_state *x; 1211 struct xfrm_userspi_info *p; 1212 struct sk_buff *resp_skb; 1213 xfrm_address_t *daddr; 1214 int family; 1215 int err; 1216 u32 mark; 1217 struct xfrm_mark m; 1218 1219 p = nlmsg_data(nlh); 1220 err = verify_spi_info(p->info.id.proto, p->min, p->max); 1221 if (err) 1222 goto out_noput; 1223 1224 family = p->info.family; 1225 daddr = &p->info.id.daddr; 1226 1227 x = NULL; 1228 1229 mark = xfrm_mark_get(attrs, &m); 1230 if (p->info.seq) { 1231 x = xfrm_find_acq_byseq(net, mark, p->info.seq); 1232 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) { 1233 xfrm_state_put(x); 1234 x = NULL; 1235 } 1236 } 1237 1238 if (!x) 1239 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid, 1240 p->info.id.proto, daddr, 1241 &p->info.saddr, 1, 1242 family); 1243 err = -ENOENT; 1244 if (x == NULL) 1245 goto out_noput; 1246 1247 err = xfrm_alloc_spi(x, p->min, p->max); 1248 if (err) 1249 goto out; 1250 1251 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 1252 if (IS_ERR(resp_skb)) { 1253 err = PTR_ERR(resp_skb); 1254 goto out; 1255 } 1256 1257 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); 1258 1259 out: 1260 xfrm_state_put(x); 1261 out_noput: 1262 return err; 1263 } 1264 1265 static int verify_policy_dir(u8 dir) 1266 { 1267 switch (dir) { 1268 case XFRM_POLICY_IN: 1269 case XFRM_POLICY_OUT: 1270 case XFRM_POLICY_FWD: 1271 break; 1272 1273 default: 1274 return -EINVAL; 1275 } 1276 1277 return 0; 1278 } 1279 1280 static int verify_policy_type(u8 type) 1281 { 1282 switch (type) { 1283 case XFRM_POLICY_TYPE_MAIN: 1284 #ifdef CONFIG_XFRM_SUB_POLICY 1285 case XFRM_POLICY_TYPE_SUB: 1286 #endif 1287 break; 1288 1289 default: 1290 return -EINVAL; 1291 } 1292 1293 return 0; 1294 } 1295 1296 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p) 1297 { 1298 int ret; 1299 1300 switch (p->share) { 1301 case XFRM_SHARE_ANY: 1302 case XFRM_SHARE_SESSION: 1303 case XFRM_SHARE_USER: 1304 case XFRM_SHARE_UNIQUE: 1305 break; 1306 1307 default: 1308 return -EINVAL; 1309 } 1310 1311 switch (p->action) { 1312 case XFRM_POLICY_ALLOW: 1313 case XFRM_POLICY_BLOCK: 1314 break; 1315 1316 default: 1317 return -EINVAL; 1318 } 1319 1320 switch (p->sel.family) { 1321 case AF_INET: 1322 break; 1323 1324 case AF_INET6: 1325 #if IS_ENABLED(CONFIG_IPV6) 1326 break; 1327 #else 1328 return -EAFNOSUPPORT; 1329 #endif 1330 1331 default: 1332 return -EINVAL; 1333 } 1334 1335 ret = verify_policy_dir(p->dir); 1336 if (ret) 1337 return ret; 1338 if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir)) 1339 return -EINVAL; 1340 1341 return 0; 1342 } 1343 1344 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs) 1345 { 1346 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1347 struct xfrm_user_sec_ctx *uctx; 1348 1349 if (!rt) 1350 return 0; 1351 1352 uctx = nla_data(rt); 1353 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL); 1354 } 1355 1356 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut, 1357 int nr) 1358 { 1359 int i; 1360 1361 xp->xfrm_nr = nr; 1362 for (i = 0; i < nr; i++, ut++) { 1363 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 1364 1365 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id)); 1366 memcpy(&t->saddr, &ut->saddr, 1367 sizeof(xfrm_address_t)); 1368 t->reqid = ut->reqid; 1369 t->mode = ut->mode; 1370 t->share = ut->share; 1371 t->optional = ut->optional; 1372 t->aalgos = ut->aalgos; 1373 t->ealgos = ut->ealgos; 1374 t->calgos = ut->calgos; 1375 /* If all masks are ~0, then we allow all algorithms. */ 1376 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos); 1377 t->encap_family = ut->family; 1378 } 1379 } 1380 1381 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family) 1382 { 1383 int i; 1384 1385 if (nr > XFRM_MAX_DEPTH) 1386 return -EINVAL; 1387 1388 for (i = 0; i < nr; i++) { 1389 /* We never validated the ut->family value, so many 1390 * applications simply leave it at zero. The check was 1391 * never made and ut->family was ignored because all 1392 * templates could be assumed to have the same family as 1393 * the policy itself. Now that we will have ipv4-in-ipv6 1394 * and ipv6-in-ipv4 tunnels, this is no longer true. 1395 */ 1396 if (!ut[i].family) 1397 ut[i].family = family; 1398 1399 switch (ut[i].family) { 1400 case AF_INET: 1401 break; 1402 #if IS_ENABLED(CONFIG_IPV6) 1403 case AF_INET6: 1404 break; 1405 #endif 1406 default: 1407 return -EINVAL; 1408 } 1409 } 1410 1411 return 0; 1412 } 1413 1414 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs) 1415 { 1416 struct nlattr *rt = attrs[XFRMA_TMPL]; 1417 1418 if (!rt) { 1419 pol->xfrm_nr = 0; 1420 } else { 1421 struct xfrm_user_tmpl *utmpl = nla_data(rt); 1422 int nr = nla_len(rt) / sizeof(*utmpl); 1423 int err; 1424 1425 err = validate_tmpl(nr, utmpl, pol->family); 1426 if (err) 1427 return err; 1428 1429 copy_templates(pol, utmpl, nr); 1430 } 1431 return 0; 1432 } 1433 1434 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs) 1435 { 1436 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE]; 1437 struct xfrm_userpolicy_type *upt; 1438 u8 type = XFRM_POLICY_TYPE_MAIN; 1439 int err; 1440 1441 if (rt) { 1442 upt = nla_data(rt); 1443 type = upt->type; 1444 } 1445 1446 err = verify_policy_type(type); 1447 if (err) 1448 return err; 1449 1450 *tp = type; 1451 return 0; 1452 } 1453 1454 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p) 1455 { 1456 xp->priority = p->priority; 1457 xp->index = p->index; 1458 memcpy(&xp->selector, &p->sel, sizeof(xp->selector)); 1459 memcpy(&xp->lft, &p->lft, sizeof(xp->lft)); 1460 xp->action = p->action; 1461 xp->flags = p->flags; 1462 xp->family = p->sel.family; 1463 /* XXX xp->share = p->share; */ 1464 } 1465 1466 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir) 1467 { 1468 memset(p, 0, sizeof(*p)); 1469 memcpy(&p->sel, &xp->selector, sizeof(p->sel)); 1470 memcpy(&p->lft, &xp->lft, sizeof(p->lft)); 1471 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft)); 1472 p->priority = xp->priority; 1473 p->index = xp->index; 1474 p->sel.family = xp->family; 1475 p->dir = dir; 1476 p->action = xp->action; 1477 p->flags = xp->flags; 1478 p->share = XFRM_SHARE_ANY; /* XXX xp->share */ 1479 } 1480 1481 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp) 1482 { 1483 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL); 1484 int err; 1485 1486 if (!xp) { 1487 *errp = -ENOMEM; 1488 return NULL; 1489 } 1490 1491 copy_from_user_policy(xp, p); 1492 1493 err = copy_from_user_policy_type(&xp->type, attrs); 1494 if (err) 1495 goto error; 1496 1497 if (!(err = copy_from_user_tmpl(xp, attrs))) 1498 err = copy_from_user_sec_ctx(xp, attrs); 1499 if (err) 1500 goto error; 1501 1502 xfrm_mark_get(attrs, &xp->mark); 1503 1504 return xp; 1505 error: 1506 *errp = err; 1507 xp->walk.dead = 1; 1508 xfrm_policy_destroy(xp); 1509 return NULL; 1510 } 1511 1512 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1513 struct nlattr **attrs) 1514 { 1515 struct net *net = sock_net(skb->sk); 1516 struct xfrm_userpolicy_info *p = nlmsg_data(nlh); 1517 struct xfrm_policy *xp; 1518 struct km_event c; 1519 int err; 1520 int excl; 1521 1522 err = verify_newpolicy_info(p); 1523 if (err) 1524 return err; 1525 err = verify_sec_ctx_len(attrs); 1526 if (err) 1527 return err; 1528 1529 xp = xfrm_policy_construct(net, p, attrs, &err); 1530 if (!xp) 1531 return err; 1532 1533 /* shouldn't excl be based on nlh flags?? 1534 * Aha! this is anti-netlink really i.e more pfkey derived 1535 * in netlink excl is a flag and you wouldnt need 1536 * a type XFRM_MSG_UPDPOLICY - JHS */ 1537 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY; 1538 err = xfrm_policy_insert(p->dir, xp, excl); 1539 xfrm_audit_policy_add(xp, err ? 0 : 1, true); 1540 1541 if (err) { 1542 security_xfrm_policy_free(xp->security); 1543 kfree(xp); 1544 return err; 1545 } 1546 1547 c.event = nlh->nlmsg_type; 1548 c.seq = nlh->nlmsg_seq; 1549 c.portid = nlh->nlmsg_pid; 1550 km_policy_notify(xp, p->dir, &c); 1551 1552 xfrm_pol_put(xp); 1553 1554 return 0; 1555 } 1556 1557 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb) 1558 { 1559 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH]; 1560 int i; 1561 1562 if (xp->xfrm_nr == 0) 1563 return 0; 1564 1565 for (i = 0; i < xp->xfrm_nr; i++) { 1566 struct xfrm_user_tmpl *up = &vec[i]; 1567 struct xfrm_tmpl *kp = &xp->xfrm_vec[i]; 1568 1569 memset(up, 0, sizeof(*up)); 1570 memcpy(&up->id, &kp->id, sizeof(up->id)); 1571 up->family = kp->encap_family; 1572 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr)); 1573 up->reqid = kp->reqid; 1574 up->mode = kp->mode; 1575 up->share = kp->share; 1576 up->optional = kp->optional; 1577 up->aalgos = kp->aalgos; 1578 up->ealgos = kp->ealgos; 1579 up->calgos = kp->calgos; 1580 } 1581 1582 return nla_put(skb, XFRMA_TMPL, 1583 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec); 1584 } 1585 1586 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb) 1587 { 1588 if (x->security) { 1589 return copy_sec_ctx(x->security, skb); 1590 } 1591 return 0; 1592 } 1593 1594 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb) 1595 { 1596 if (xp->security) 1597 return copy_sec_ctx(xp->security, skb); 1598 return 0; 1599 } 1600 static inline size_t userpolicy_type_attrsize(void) 1601 { 1602 #ifdef CONFIG_XFRM_SUB_POLICY 1603 return nla_total_size(sizeof(struct xfrm_userpolicy_type)); 1604 #else 1605 return 0; 1606 #endif 1607 } 1608 1609 #ifdef CONFIG_XFRM_SUB_POLICY 1610 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1611 { 1612 struct xfrm_userpolicy_type upt = { 1613 .type = type, 1614 }; 1615 1616 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt); 1617 } 1618 1619 #else 1620 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1621 { 1622 return 0; 1623 } 1624 #endif 1625 1626 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr) 1627 { 1628 struct xfrm_dump_info *sp = ptr; 1629 struct xfrm_userpolicy_info *p; 1630 struct sk_buff *in_skb = sp->in_skb; 1631 struct sk_buff *skb = sp->out_skb; 1632 struct nlmsghdr *nlh; 1633 int err; 1634 1635 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, 1636 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags); 1637 if (nlh == NULL) 1638 return -EMSGSIZE; 1639 1640 p = nlmsg_data(nlh); 1641 copy_to_user_policy(xp, p, dir); 1642 err = copy_to_user_tmpl(xp, skb); 1643 if (!err) 1644 err = copy_to_user_sec_ctx(xp, skb); 1645 if (!err) 1646 err = copy_to_user_policy_type(xp->type, skb); 1647 if (!err) 1648 err = xfrm_mark_put(skb, &xp->mark); 1649 if (err) { 1650 nlmsg_cancel(skb, nlh); 1651 return err; 1652 } 1653 nlmsg_end(skb, nlh); 1654 return 0; 1655 } 1656 1657 static int xfrm_dump_policy_done(struct netlink_callback *cb) 1658 { 1659 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1]; 1660 struct net *net = sock_net(cb->skb->sk); 1661 1662 xfrm_policy_walk_done(walk, net); 1663 return 0; 1664 } 1665 1666 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb) 1667 { 1668 struct net *net = sock_net(skb->sk); 1669 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1]; 1670 struct xfrm_dump_info info; 1671 1672 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) > 1673 sizeof(cb->args) - sizeof(cb->args[0])); 1674 1675 info.in_skb = cb->skb; 1676 info.out_skb = skb; 1677 info.nlmsg_seq = cb->nlh->nlmsg_seq; 1678 info.nlmsg_flags = NLM_F_MULTI; 1679 1680 if (!cb->args[0]) { 1681 cb->args[0] = 1; 1682 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY); 1683 } 1684 1685 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info); 1686 1687 return skb->len; 1688 } 1689 1690 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb, 1691 struct xfrm_policy *xp, 1692 int dir, u32 seq) 1693 { 1694 struct xfrm_dump_info info; 1695 struct sk_buff *skb; 1696 int err; 1697 1698 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1699 if (!skb) 1700 return ERR_PTR(-ENOMEM); 1701 1702 info.in_skb = in_skb; 1703 info.out_skb = skb; 1704 info.nlmsg_seq = seq; 1705 info.nlmsg_flags = 0; 1706 1707 err = dump_one_policy(xp, dir, 0, &info); 1708 if (err) { 1709 kfree_skb(skb); 1710 return ERR_PTR(err); 1711 } 1712 1713 return skb; 1714 } 1715 1716 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1717 struct nlattr **attrs) 1718 { 1719 struct net *net = sock_net(skb->sk); 1720 struct xfrm_policy *xp; 1721 struct xfrm_userpolicy_id *p; 1722 u8 type = XFRM_POLICY_TYPE_MAIN; 1723 int err; 1724 struct km_event c; 1725 int delete; 1726 struct xfrm_mark m; 1727 u32 mark = xfrm_mark_get(attrs, &m); 1728 1729 p = nlmsg_data(nlh); 1730 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY; 1731 1732 err = copy_from_user_policy_type(&type, attrs); 1733 if (err) 1734 return err; 1735 1736 err = verify_policy_dir(p->dir); 1737 if (err) 1738 return err; 1739 1740 if (p->index) 1741 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err); 1742 else { 1743 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1744 struct xfrm_sec_ctx *ctx; 1745 1746 err = verify_sec_ctx_len(attrs); 1747 if (err) 1748 return err; 1749 1750 ctx = NULL; 1751 if (rt) { 1752 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 1753 1754 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); 1755 if (err) 1756 return err; 1757 } 1758 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel, 1759 ctx, delete, &err); 1760 security_xfrm_policy_free(ctx); 1761 } 1762 if (xp == NULL) 1763 return -ENOENT; 1764 1765 if (!delete) { 1766 struct sk_buff *resp_skb; 1767 1768 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq); 1769 if (IS_ERR(resp_skb)) { 1770 err = PTR_ERR(resp_skb); 1771 } else { 1772 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, 1773 NETLINK_CB(skb).portid); 1774 } 1775 } else { 1776 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 1777 1778 if (err != 0) 1779 goto out; 1780 1781 c.data.byid = p->index; 1782 c.event = nlh->nlmsg_type; 1783 c.seq = nlh->nlmsg_seq; 1784 c.portid = nlh->nlmsg_pid; 1785 km_policy_notify(xp, p->dir, &c); 1786 } 1787 1788 out: 1789 xfrm_pol_put(xp); 1790 if (delete && err == 0) 1791 xfrm_garbage_collect(net); 1792 return err; 1793 } 1794 1795 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 1796 struct nlattr **attrs) 1797 { 1798 struct net *net = sock_net(skb->sk); 1799 struct km_event c; 1800 struct xfrm_usersa_flush *p = nlmsg_data(nlh); 1801 int err; 1802 1803 err = xfrm_state_flush(net, p->proto, true); 1804 if (err) { 1805 if (err == -ESRCH) /* empty table */ 1806 return 0; 1807 return err; 1808 } 1809 c.data.proto = p->proto; 1810 c.event = nlh->nlmsg_type; 1811 c.seq = nlh->nlmsg_seq; 1812 c.portid = nlh->nlmsg_pid; 1813 c.net = net; 1814 km_state_notify(NULL, &c); 1815 1816 return 0; 1817 } 1818 1819 static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x) 1820 { 1821 size_t replay_size = x->replay_esn ? 1822 xfrm_replay_state_esn_len(x->replay_esn) : 1823 sizeof(struct xfrm_replay_state); 1824 1825 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id)) 1826 + nla_total_size(replay_size) 1827 + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur)) 1828 + nla_total_size(sizeof(struct xfrm_mark)) 1829 + nla_total_size(4) /* XFRM_AE_RTHR */ 1830 + nla_total_size(4); /* XFRM_AE_ETHR */ 1831 } 1832 1833 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 1834 { 1835 struct xfrm_aevent_id *id; 1836 struct nlmsghdr *nlh; 1837 int err; 1838 1839 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0); 1840 if (nlh == NULL) 1841 return -EMSGSIZE; 1842 1843 id = nlmsg_data(nlh); 1844 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr)); 1845 id->sa_id.spi = x->id.spi; 1846 id->sa_id.family = x->props.family; 1847 id->sa_id.proto = x->id.proto; 1848 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr)); 1849 id->reqid = x->props.reqid; 1850 id->flags = c->data.aevent; 1851 1852 if (x->replay_esn) { 1853 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL, 1854 xfrm_replay_state_esn_len(x->replay_esn), 1855 x->replay_esn); 1856 } else { 1857 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), 1858 &x->replay); 1859 } 1860 if (err) 1861 goto out_cancel; 1862 err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft, 1863 XFRMA_PAD); 1864 if (err) 1865 goto out_cancel; 1866 1867 if (id->flags & XFRM_AE_RTHR) { 1868 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff); 1869 if (err) 1870 goto out_cancel; 1871 } 1872 if (id->flags & XFRM_AE_ETHR) { 1873 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH, 1874 x->replay_maxage * 10 / HZ); 1875 if (err) 1876 goto out_cancel; 1877 } 1878 err = xfrm_mark_put(skb, &x->mark); 1879 if (err) 1880 goto out_cancel; 1881 1882 nlmsg_end(skb, nlh); 1883 return 0; 1884 1885 out_cancel: 1886 nlmsg_cancel(skb, nlh); 1887 return err; 1888 } 1889 1890 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 1891 struct nlattr **attrs) 1892 { 1893 struct net *net = sock_net(skb->sk); 1894 struct xfrm_state *x; 1895 struct sk_buff *r_skb; 1896 int err; 1897 struct km_event c; 1898 u32 mark; 1899 struct xfrm_mark m; 1900 struct xfrm_aevent_id *p = nlmsg_data(nlh); 1901 struct xfrm_usersa_id *id = &p->sa_id; 1902 1903 mark = xfrm_mark_get(attrs, &m); 1904 1905 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family); 1906 if (x == NULL) 1907 return -ESRCH; 1908 1909 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 1910 if (r_skb == NULL) { 1911 xfrm_state_put(x); 1912 return -ENOMEM; 1913 } 1914 1915 /* 1916 * XXX: is this lock really needed - none of the other 1917 * gets lock (the concern is things getting updated 1918 * while we are still reading) - jhs 1919 */ 1920 spin_lock_bh(&x->lock); 1921 c.data.aevent = p->flags; 1922 c.seq = nlh->nlmsg_seq; 1923 c.portid = nlh->nlmsg_pid; 1924 1925 if (build_aevent(r_skb, x, &c) < 0) 1926 BUG(); 1927 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid); 1928 spin_unlock_bh(&x->lock); 1929 xfrm_state_put(x); 1930 return err; 1931 } 1932 1933 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 1934 struct nlattr **attrs) 1935 { 1936 struct net *net = sock_net(skb->sk); 1937 struct xfrm_state *x; 1938 struct km_event c; 1939 int err = -EINVAL; 1940 u32 mark = 0; 1941 struct xfrm_mark m; 1942 struct xfrm_aevent_id *p = nlmsg_data(nlh); 1943 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 1944 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL]; 1945 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 1946 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; 1947 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; 1948 1949 if (!lt && !rp && !re && !et && !rt) 1950 return err; 1951 1952 /* pedantic mode - thou shalt sayeth replaceth */ 1953 if (!(nlh->nlmsg_flags&NLM_F_REPLACE)) 1954 return err; 1955 1956 mark = xfrm_mark_get(attrs, &m); 1957 1958 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family); 1959 if (x == NULL) 1960 return -ESRCH; 1961 1962 if (x->km.state != XFRM_STATE_VALID) 1963 goto out; 1964 1965 err = xfrm_replay_verify_len(x->replay_esn, re); 1966 if (err) 1967 goto out; 1968 1969 spin_lock_bh(&x->lock); 1970 xfrm_update_ae_params(x, attrs, 1); 1971 spin_unlock_bh(&x->lock); 1972 1973 c.event = nlh->nlmsg_type; 1974 c.seq = nlh->nlmsg_seq; 1975 c.portid = nlh->nlmsg_pid; 1976 c.data.aevent = XFRM_AE_CU; 1977 km_state_notify(x, &c); 1978 err = 0; 1979 out: 1980 xfrm_state_put(x); 1981 return err; 1982 } 1983 1984 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1985 struct nlattr **attrs) 1986 { 1987 struct net *net = sock_net(skb->sk); 1988 struct km_event c; 1989 u8 type = XFRM_POLICY_TYPE_MAIN; 1990 int err; 1991 1992 err = copy_from_user_policy_type(&type, attrs); 1993 if (err) 1994 return err; 1995 1996 err = xfrm_policy_flush(net, type, true); 1997 if (err) { 1998 if (err == -ESRCH) /* empty table */ 1999 return 0; 2000 return err; 2001 } 2002 2003 c.data.type = type; 2004 c.event = nlh->nlmsg_type; 2005 c.seq = nlh->nlmsg_seq; 2006 c.portid = nlh->nlmsg_pid; 2007 c.net = net; 2008 km_policy_notify(NULL, 0, &c); 2009 return 0; 2010 } 2011 2012 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 2013 struct nlattr **attrs) 2014 { 2015 struct net *net = sock_net(skb->sk); 2016 struct xfrm_policy *xp; 2017 struct xfrm_user_polexpire *up = nlmsg_data(nlh); 2018 struct xfrm_userpolicy_info *p = &up->pol; 2019 u8 type = XFRM_POLICY_TYPE_MAIN; 2020 int err = -ENOENT; 2021 struct xfrm_mark m; 2022 u32 mark = xfrm_mark_get(attrs, &m); 2023 2024 err = copy_from_user_policy_type(&type, attrs); 2025 if (err) 2026 return err; 2027 2028 err = verify_policy_dir(p->dir); 2029 if (err) 2030 return err; 2031 2032 if (p->index) 2033 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err); 2034 else { 2035 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 2036 struct xfrm_sec_ctx *ctx; 2037 2038 err = verify_sec_ctx_len(attrs); 2039 if (err) 2040 return err; 2041 2042 ctx = NULL; 2043 if (rt) { 2044 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 2045 2046 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); 2047 if (err) 2048 return err; 2049 } 2050 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, 2051 &p->sel, ctx, 0, &err); 2052 security_xfrm_policy_free(ctx); 2053 } 2054 if (xp == NULL) 2055 return -ENOENT; 2056 2057 if (unlikely(xp->walk.dead)) 2058 goto out; 2059 2060 err = 0; 2061 if (up->hard) { 2062 xfrm_policy_delete(xp, p->dir); 2063 xfrm_audit_policy_delete(xp, 1, true); 2064 } 2065 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid); 2066 2067 out: 2068 xfrm_pol_put(xp); 2069 return err; 2070 } 2071 2072 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 2073 struct nlattr **attrs) 2074 { 2075 struct net *net = sock_net(skb->sk); 2076 struct xfrm_state *x; 2077 int err; 2078 struct xfrm_user_expire *ue = nlmsg_data(nlh); 2079 struct xfrm_usersa_info *p = &ue->state; 2080 struct xfrm_mark m; 2081 u32 mark = xfrm_mark_get(attrs, &m); 2082 2083 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family); 2084 2085 err = -ENOENT; 2086 if (x == NULL) 2087 return err; 2088 2089 spin_lock_bh(&x->lock); 2090 err = -EINVAL; 2091 if (x->km.state != XFRM_STATE_VALID) 2092 goto out; 2093 km_state_expired(x, ue->hard, nlh->nlmsg_pid); 2094 2095 if (ue->hard) { 2096 __xfrm_state_delete(x); 2097 xfrm_audit_state_delete(x, 1, true); 2098 } 2099 err = 0; 2100 out: 2101 spin_unlock_bh(&x->lock); 2102 xfrm_state_put(x); 2103 return err; 2104 } 2105 2106 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, 2107 struct nlattr **attrs) 2108 { 2109 struct net *net = sock_net(skb->sk); 2110 struct xfrm_policy *xp; 2111 struct xfrm_user_tmpl *ut; 2112 int i; 2113 struct nlattr *rt = attrs[XFRMA_TMPL]; 2114 struct xfrm_mark mark; 2115 2116 struct xfrm_user_acquire *ua = nlmsg_data(nlh); 2117 struct xfrm_state *x = xfrm_state_alloc(net); 2118 int err = -ENOMEM; 2119 2120 if (!x) 2121 goto nomem; 2122 2123 xfrm_mark_get(attrs, &mark); 2124 2125 err = verify_newpolicy_info(&ua->policy); 2126 if (err) 2127 goto free_state; 2128 2129 /* build an XP */ 2130 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err); 2131 if (!xp) 2132 goto free_state; 2133 2134 memcpy(&x->id, &ua->id, sizeof(ua->id)); 2135 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr)); 2136 memcpy(&x->sel, &ua->sel, sizeof(ua->sel)); 2137 xp->mark.m = x->mark.m = mark.m; 2138 xp->mark.v = x->mark.v = mark.v; 2139 ut = nla_data(rt); 2140 /* extract the templates and for each call km_key */ 2141 for (i = 0; i < xp->xfrm_nr; i++, ut++) { 2142 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 2143 memcpy(&x->id, &t->id, sizeof(x->id)); 2144 x->props.mode = t->mode; 2145 x->props.reqid = t->reqid; 2146 x->props.family = ut->family; 2147 t->aalgos = ua->aalgos; 2148 t->ealgos = ua->ealgos; 2149 t->calgos = ua->calgos; 2150 err = km_query(x, t, xp); 2151 2152 } 2153 2154 kfree(x); 2155 kfree(xp); 2156 2157 return 0; 2158 2159 free_state: 2160 kfree(x); 2161 nomem: 2162 return err; 2163 } 2164 2165 #ifdef CONFIG_XFRM_MIGRATE 2166 static int copy_from_user_migrate(struct xfrm_migrate *ma, 2167 struct xfrm_kmaddress *k, 2168 struct nlattr **attrs, int *num) 2169 { 2170 struct nlattr *rt = attrs[XFRMA_MIGRATE]; 2171 struct xfrm_user_migrate *um; 2172 int i, num_migrate; 2173 2174 if (k != NULL) { 2175 struct xfrm_user_kmaddress *uk; 2176 2177 uk = nla_data(attrs[XFRMA_KMADDRESS]); 2178 memcpy(&k->local, &uk->local, sizeof(k->local)); 2179 memcpy(&k->remote, &uk->remote, sizeof(k->remote)); 2180 k->family = uk->family; 2181 k->reserved = uk->reserved; 2182 } 2183 2184 um = nla_data(rt); 2185 num_migrate = nla_len(rt) / sizeof(*um); 2186 2187 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH) 2188 return -EINVAL; 2189 2190 for (i = 0; i < num_migrate; i++, um++, ma++) { 2191 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr)); 2192 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr)); 2193 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr)); 2194 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr)); 2195 2196 ma->proto = um->proto; 2197 ma->mode = um->mode; 2198 ma->reqid = um->reqid; 2199 2200 ma->old_family = um->old_family; 2201 ma->new_family = um->new_family; 2202 } 2203 2204 *num = i; 2205 return 0; 2206 } 2207 2208 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 2209 struct nlattr **attrs) 2210 { 2211 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh); 2212 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 2213 struct xfrm_kmaddress km, *kmp; 2214 u8 type; 2215 int err; 2216 int n = 0; 2217 struct net *net = sock_net(skb->sk); 2218 2219 if (attrs[XFRMA_MIGRATE] == NULL) 2220 return -EINVAL; 2221 2222 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL; 2223 2224 err = copy_from_user_policy_type(&type, attrs); 2225 if (err) 2226 return err; 2227 2228 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n); 2229 if (err) 2230 return err; 2231 2232 if (!n) 2233 return 0; 2234 2235 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net); 2236 2237 return 0; 2238 } 2239 #else 2240 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 2241 struct nlattr **attrs) 2242 { 2243 return -ENOPROTOOPT; 2244 } 2245 #endif 2246 2247 #ifdef CONFIG_XFRM_MIGRATE 2248 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb) 2249 { 2250 struct xfrm_user_migrate um; 2251 2252 memset(&um, 0, sizeof(um)); 2253 um.proto = m->proto; 2254 um.mode = m->mode; 2255 um.reqid = m->reqid; 2256 um.old_family = m->old_family; 2257 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr)); 2258 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr)); 2259 um.new_family = m->new_family; 2260 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr)); 2261 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr)); 2262 2263 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um); 2264 } 2265 2266 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb) 2267 { 2268 struct xfrm_user_kmaddress uk; 2269 2270 memset(&uk, 0, sizeof(uk)); 2271 uk.family = k->family; 2272 uk.reserved = k->reserved; 2273 memcpy(&uk.local, &k->local, sizeof(uk.local)); 2274 memcpy(&uk.remote, &k->remote, sizeof(uk.remote)); 2275 2276 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk); 2277 } 2278 2279 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma) 2280 { 2281 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id)) 2282 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0) 2283 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate) 2284 + userpolicy_type_attrsize(); 2285 } 2286 2287 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m, 2288 int num_migrate, const struct xfrm_kmaddress *k, 2289 const struct xfrm_selector *sel, u8 dir, u8 type) 2290 { 2291 const struct xfrm_migrate *mp; 2292 struct xfrm_userpolicy_id *pol_id; 2293 struct nlmsghdr *nlh; 2294 int i, err; 2295 2296 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0); 2297 if (nlh == NULL) 2298 return -EMSGSIZE; 2299 2300 pol_id = nlmsg_data(nlh); 2301 /* copy data from selector, dir, and type to the pol_id */ 2302 memset(pol_id, 0, sizeof(*pol_id)); 2303 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel)); 2304 pol_id->dir = dir; 2305 2306 if (k != NULL) { 2307 err = copy_to_user_kmaddress(k, skb); 2308 if (err) 2309 goto out_cancel; 2310 } 2311 err = copy_to_user_policy_type(type, skb); 2312 if (err) 2313 goto out_cancel; 2314 for (i = 0, mp = m ; i < num_migrate; i++, mp++) { 2315 err = copy_to_user_migrate(mp, skb); 2316 if (err) 2317 goto out_cancel; 2318 } 2319 2320 nlmsg_end(skb, nlh); 2321 return 0; 2322 2323 out_cancel: 2324 nlmsg_cancel(skb, nlh); 2325 return err; 2326 } 2327 2328 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2329 const struct xfrm_migrate *m, int num_migrate, 2330 const struct xfrm_kmaddress *k) 2331 { 2332 struct net *net = &init_net; 2333 struct sk_buff *skb; 2334 2335 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC); 2336 if (skb == NULL) 2337 return -ENOMEM; 2338 2339 /* build migrate */ 2340 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0) 2341 BUG(); 2342 2343 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE); 2344 } 2345 #else 2346 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2347 const struct xfrm_migrate *m, int num_migrate, 2348 const struct xfrm_kmaddress *k) 2349 { 2350 return -ENOPROTOOPT; 2351 } 2352 #endif 2353 2354 #define XMSGSIZE(type) sizeof(struct type) 2355 2356 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = { 2357 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2358 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2359 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2360 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2361 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2362 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2363 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info), 2364 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire), 2365 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire), 2366 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2367 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2368 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire), 2369 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush), 2370 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0, 2371 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2372 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2373 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report), 2374 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2375 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32), 2376 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 2377 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 2378 }; 2379 2380 #undef XMSGSIZE 2381 2382 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = { 2383 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)}, 2384 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)}, 2385 [XFRMA_LASTUSED] = { .type = NLA_U64}, 2386 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)}, 2387 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) }, 2388 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) }, 2389 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) }, 2390 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) }, 2391 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) }, 2392 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) }, 2393 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) }, 2394 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) }, 2395 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) }, 2396 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 }, 2397 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 }, 2398 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) }, 2399 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) }, 2400 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)}, 2401 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) }, 2402 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) }, 2403 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) }, 2404 [XFRMA_TFCPAD] = { .type = NLA_U32 }, 2405 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) }, 2406 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 }, 2407 [XFRMA_PROTO] = { .type = NLA_U8 }, 2408 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) }, 2409 }; 2410 2411 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = { 2412 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) }, 2413 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) }, 2414 }; 2415 2416 static const struct xfrm_link { 2417 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **); 2418 int (*dump)(struct sk_buff *, struct netlink_callback *); 2419 int (*done)(struct netlink_callback *); 2420 const struct nla_policy *nla_pol; 2421 int nla_max; 2422 } xfrm_dispatch[XFRM_NR_MSGTYPES] = { 2423 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 2424 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa }, 2425 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa, 2426 .dump = xfrm_dump_sa, 2427 .done = xfrm_dump_sa_done }, 2428 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 2429 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy }, 2430 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy, 2431 .dump = xfrm_dump_policy, 2432 .done = xfrm_dump_policy_done }, 2433 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi }, 2434 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire }, 2435 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire }, 2436 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 2437 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 2438 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire}, 2439 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa }, 2440 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy }, 2441 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae }, 2442 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae }, 2443 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate }, 2444 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo }, 2445 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo, 2446 .nla_pol = xfrma_spd_policy, 2447 .nla_max = XFRMA_SPD_MAX }, 2448 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo }, 2449 }; 2450 2451 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 2452 { 2453 struct net *net = sock_net(skb->sk); 2454 struct nlattr *attrs[XFRMA_MAX+1]; 2455 const struct xfrm_link *link; 2456 int type, err; 2457 2458 #ifdef CONFIG_COMPAT 2459 if (in_compat_syscall()) 2460 return -EOPNOTSUPP; 2461 #endif 2462 2463 type = nlh->nlmsg_type; 2464 if (type > XFRM_MSG_MAX) 2465 return -EINVAL; 2466 2467 type -= XFRM_MSG_BASE; 2468 link = &xfrm_dispatch[type]; 2469 2470 /* All operations require privileges, even GET */ 2471 if (!netlink_net_capable(skb, CAP_NET_ADMIN)) 2472 return -EPERM; 2473 2474 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) || 2475 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) && 2476 (nlh->nlmsg_flags & NLM_F_DUMP)) { 2477 if (link->dump == NULL) 2478 return -EINVAL; 2479 2480 { 2481 struct netlink_dump_control c = { 2482 .dump = link->dump, 2483 .done = link->done, 2484 }; 2485 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c); 2486 } 2487 } 2488 2489 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, 2490 link->nla_max ? : XFRMA_MAX, 2491 link->nla_pol ? : xfrma_policy); 2492 if (err < 0) 2493 return err; 2494 2495 if (link->doit == NULL) 2496 return -EINVAL; 2497 2498 return link->doit(skb, nlh, attrs); 2499 } 2500 2501 static void xfrm_netlink_rcv(struct sk_buff *skb) 2502 { 2503 struct net *net = sock_net(skb->sk); 2504 2505 mutex_lock(&net->xfrm.xfrm_cfg_mutex); 2506 netlink_rcv_skb(skb, &xfrm_user_rcv_msg); 2507 mutex_unlock(&net->xfrm.xfrm_cfg_mutex); 2508 } 2509 2510 static inline size_t xfrm_expire_msgsize(void) 2511 { 2512 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire)) 2513 + nla_total_size(sizeof(struct xfrm_mark)); 2514 } 2515 2516 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 2517 { 2518 struct xfrm_user_expire *ue; 2519 struct nlmsghdr *nlh; 2520 int err; 2521 2522 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0); 2523 if (nlh == NULL) 2524 return -EMSGSIZE; 2525 2526 ue = nlmsg_data(nlh); 2527 copy_to_user_state(x, &ue->state); 2528 ue->hard = (c->data.hard != 0) ? 1 : 0; 2529 2530 err = xfrm_mark_put(skb, &x->mark); 2531 if (err) 2532 return err; 2533 2534 nlmsg_end(skb, nlh); 2535 return 0; 2536 } 2537 2538 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c) 2539 { 2540 struct net *net = xs_net(x); 2541 struct sk_buff *skb; 2542 2543 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC); 2544 if (skb == NULL) 2545 return -ENOMEM; 2546 2547 if (build_expire(skb, x, c) < 0) { 2548 kfree_skb(skb); 2549 return -EMSGSIZE; 2550 } 2551 2552 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE); 2553 } 2554 2555 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c) 2556 { 2557 struct net *net = xs_net(x); 2558 struct sk_buff *skb; 2559 2560 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 2561 if (skb == NULL) 2562 return -ENOMEM; 2563 2564 if (build_aevent(skb, x, c) < 0) 2565 BUG(); 2566 2567 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS); 2568 } 2569 2570 static int xfrm_notify_sa_flush(const struct km_event *c) 2571 { 2572 struct net *net = c->net; 2573 struct xfrm_usersa_flush *p; 2574 struct nlmsghdr *nlh; 2575 struct sk_buff *skb; 2576 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush)); 2577 2578 skb = nlmsg_new(len, GFP_ATOMIC); 2579 if (skb == NULL) 2580 return -ENOMEM; 2581 2582 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0); 2583 if (nlh == NULL) { 2584 kfree_skb(skb); 2585 return -EMSGSIZE; 2586 } 2587 2588 p = nlmsg_data(nlh); 2589 p->proto = c->data.proto; 2590 2591 nlmsg_end(skb, nlh); 2592 2593 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA); 2594 } 2595 2596 static inline size_t xfrm_sa_len(struct xfrm_state *x) 2597 { 2598 size_t l = 0; 2599 if (x->aead) 2600 l += nla_total_size(aead_len(x->aead)); 2601 if (x->aalg) { 2602 l += nla_total_size(sizeof(struct xfrm_algo) + 2603 (x->aalg->alg_key_len + 7) / 8); 2604 l += nla_total_size(xfrm_alg_auth_len(x->aalg)); 2605 } 2606 if (x->ealg) 2607 l += nla_total_size(xfrm_alg_len(x->ealg)); 2608 if (x->calg) 2609 l += nla_total_size(sizeof(*x->calg)); 2610 if (x->encap) 2611 l += nla_total_size(sizeof(*x->encap)); 2612 if (x->tfcpad) 2613 l += nla_total_size(sizeof(x->tfcpad)); 2614 if (x->replay_esn) 2615 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn)); 2616 else 2617 l += nla_total_size(sizeof(struct xfrm_replay_state)); 2618 if (x->security) 2619 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) + 2620 x->security->ctx_len); 2621 if (x->coaddr) 2622 l += nla_total_size(sizeof(*x->coaddr)); 2623 if (x->props.extra_flags) 2624 l += nla_total_size(sizeof(x->props.extra_flags)); 2625 2626 /* Must count x->lastused as it may become non-zero behind our back. */ 2627 l += nla_total_size_64bit(sizeof(u64)); 2628 2629 return l; 2630 } 2631 2632 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c) 2633 { 2634 struct net *net = xs_net(x); 2635 struct xfrm_usersa_info *p; 2636 struct xfrm_usersa_id *id; 2637 struct nlmsghdr *nlh; 2638 struct sk_buff *skb; 2639 int len = xfrm_sa_len(x); 2640 int headlen, err; 2641 2642 headlen = sizeof(*p); 2643 if (c->event == XFRM_MSG_DELSA) { 2644 len += nla_total_size(headlen); 2645 headlen = sizeof(*id); 2646 len += nla_total_size(sizeof(struct xfrm_mark)); 2647 } 2648 len += NLMSG_ALIGN(headlen); 2649 2650 skb = nlmsg_new(len, GFP_ATOMIC); 2651 if (skb == NULL) 2652 return -ENOMEM; 2653 2654 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); 2655 err = -EMSGSIZE; 2656 if (nlh == NULL) 2657 goto out_free_skb; 2658 2659 p = nlmsg_data(nlh); 2660 if (c->event == XFRM_MSG_DELSA) { 2661 struct nlattr *attr; 2662 2663 id = nlmsg_data(nlh); 2664 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr)); 2665 id->spi = x->id.spi; 2666 id->family = x->props.family; 2667 id->proto = x->id.proto; 2668 2669 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p)); 2670 err = -EMSGSIZE; 2671 if (attr == NULL) 2672 goto out_free_skb; 2673 2674 p = nla_data(attr); 2675 } 2676 err = copy_to_user_state_extra(x, p, skb); 2677 if (err) 2678 goto out_free_skb; 2679 2680 nlmsg_end(skb, nlh); 2681 2682 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA); 2683 2684 out_free_skb: 2685 kfree_skb(skb); 2686 return err; 2687 } 2688 2689 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c) 2690 { 2691 2692 switch (c->event) { 2693 case XFRM_MSG_EXPIRE: 2694 return xfrm_exp_state_notify(x, c); 2695 case XFRM_MSG_NEWAE: 2696 return xfrm_aevent_state_notify(x, c); 2697 case XFRM_MSG_DELSA: 2698 case XFRM_MSG_UPDSA: 2699 case XFRM_MSG_NEWSA: 2700 return xfrm_notify_sa(x, c); 2701 case XFRM_MSG_FLUSHSA: 2702 return xfrm_notify_sa_flush(c); 2703 default: 2704 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n", 2705 c->event); 2706 break; 2707 } 2708 2709 return 0; 2710 2711 } 2712 2713 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x, 2714 struct xfrm_policy *xp) 2715 { 2716 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire)) 2717 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 2718 + nla_total_size(sizeof(struct xfrm_mark)) 2719 + nla_total_size(xfrm_user_sec_ctx_size(x->security)) 2720 + userpolicy_type_attrsize(); 2721 } 2722 2723 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x, 2724 struct xfrm_tmpl *xt, struct xfrm_policy *xp) 2725 { 2726 __u32 seq = xfrm_get_acqseq(); 2727 struct xfrm_user_acquire *ua; 2728 struct nlmsghdr *nlh; 2729 int err; 2730 2731 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0); 2732 if (nlh == NULL) 2733 return -EMSGSIZE; 2734 2735 ua = nlmsg_data(nlh); 2736 memcpy(&ua->id, &x->id, sizeof(ua->id)); 2737 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr)); 2738 memcpy(&ua->sel, &x->sel, sizeof(ua->sel)); 2739 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT); 2740 ua->aalgos = xt->aalgos; 2741 ua->ealgos = xt->ealgos; 2742 ua->calgos = xt->calgos; 2743 ua->seq = x->km.seq = seq; 2744 2745 err = copy_to_user_tmpl(xp, skb); 2746 if (!err) 2747 err = copy_to_user_state_sec_ctx(x, skb); 2748 if (!err) 2749 err = copy_to_user_policy_type(xp->type, skb); 2750 if (!err) 2751 err = xfrm_mark_put(skb, &xp->mark); 2752 if (err) { 2753 nlmsg_cancel(skb, nlh); 2754 return err; 2755 } 2756 2757 nlmsg_end(skb, nlh); 2758 return 0; 2759 } 2760 2761 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt, 2762 struct xfrm_policy *xp) 2763 { 2764 struct net *net = xs_net(x); 2765 struct sk_buff *skb; 2766 2767 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC); 2768 if (skb == NULL) 2769 return -ENOMEM; 2770 2771 if (build_acquire(skb, x, xt, xp) < 0) 2772 BUG(); 2773 2774 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE); 2775 } 2776 2777 /* User gives us xfrm_user_policy_info followed by an array of 0 2778 * or more templates. 2779 */ 2780 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt, 2781 u8 *data, int len, int *dir) 2782 { 2783 struct net *net = sock_net(sk); 2784 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data; 2785 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1); 2786 struct xfrm_policy *xp; 2787 int nr; 2788 2789 switch (sk->sk_family) { 2790 case AF_INET: 2791 if (opt != IP_XFRM_POLICY) { 2792 *dir = -EOPNOTSUPP; 2793 return NULL; 2794 } 2795 break; 2796 #if IS_ENABLED(CONFIG_IPV6) 2797 case AF_INET6: 2798 if (opt != IPV6_XFRM_POLICY) { 2799 *dir = -EOPNOTSUPP; 2800 return NULL; 2801 } 2802 break; 2803 #endif 2804 default: 2805 *dir = -EINVAL; 2806 return NULL; 2807 } 2808 2809 *dir = -EINVAL; 2810 2811 if (len < sizeof(*p) || 2812 verify_newpolicy_info(p)) 2813 return NULL; 2814 2815 nr = ((len - sizeof(*p)) / sizeof(*ut)); 2816 if (validate_tmpl(nr, ut, p->sel.family)) 2817 return NULL; 2818 2819 if (p->dir > XFRM_POLICY_OUT) 2820 return NULL; 2821 2822 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 2823 if (xp == NULL) { 2824 *dir = -ENOBUFS; 2825 return NULL; 2826 } 2827 2828 copy_from_user_policy(xp, p); 2829 xp->type = XFRM_POLICY_TYPE_MAIN; 2830 copy_templates(xp, ut, nr); 2831 2832 *dir = p->dir; 2833 2834 return xp; 2835 } 2836 2837 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp) 2838 { 2839 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire)) 2840 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 2841 + nla_total_size(xfrm_user_sec_ctx_size(xp->security)) 2842 + nla_total_size(sizeof(struct xfrm_mark)) 2843 + userpolicy_type_attrsize(); 2844 } 2845 2846 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp, 2847 int dir, const struct km_event *c) 2848 { 2849 struct xfrm_user_polexpire *upe; 2850 int hard = c->data.hard; 2851 struct nlmsghdr *nlh; 2852 int err; 2853 2854 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0); 2855 if (nlh == NULL) 2856 return -EMSGSIZE; 2857 2858 upe = nlmsg_data(nlh); 2859 copy_to_user_policy(xp, &upe->pol, dir); 2860 err = copy_to_user_tmpl(xp, skb); 2861 if (!err) 2862 err = copy_to_user_sec_ctx(xp, skb); 2863 if (!err) 2864 err = copy_to_user_policy_type(xp->type, skb); 2865 if (!err) 2866 err = xfrm_mark_put(skb, &xp->mark); 2867 if (err) { 2868 nlmsg_cancel(skb, nlh); 2869 return err; 2870 } 2871 upe->hard = !!hard; 2872 2873 nlmsg_end(skb, nlh); 2874 return 0; 2875 } 2876 2877 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 2878 { 2879 struct net *net = xp_net(xp); 2880 struct sk_buff *skb; 2881 2882 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC); 2883 if (skb == NULL) 2884 return -ENOMEM; 2885 2886 if (build_polexpire(skb, xp, dir, c) < 0) 2887 BUG(); 2888 2889 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE); 2890 } 2891 2892 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) 2893 { 2894 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); 2895 struct net *net = xp_net(xp); 2896 struct xfrm_userpolicy_info *p; 2897 struct xfrm_userpolicy_id *id; 2898 struct nlmsghdr *nlh; 2899 struct sk_buff *skb; 2900 int headlen, err; 2901 2902 headlen = sizeof(*p); 2903 if (c->event == XFRM_MSG_DELPOLICY) { 2904 len += nla_total_size(headlen); 2905 headlen = sizeof(*id); 2906 } 2907 len += userpolicy_type_attrsize(); 2908 len += nla_total_size(sizeof(struct xfrm_mark)); 2909 len += NLMSG_ALIGN(headlen); 2910 2911 skb = nlmsg_new(len, GFP_ATOMIC); 2912 if (skb == NULL) 2913 return -ENOMEM; 2914 2915 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); 2916 err = -EMSGSIZE; 2917 if (nlh == NULL) 2918 goto out_free_skb; 2919 2920 p = nlmsg_data(nlh); 2921 if (c->event == XFRM_MSG_DELPOLICY) { 2922 struct nlattr *attr; 2923 2924 id = nlmsg_data(nlh); 2925 memset(id, 0, sizeof(*id)); 2926 id->dir = dir; 2927 if (c->data.byid) 2928 id->index = xp->index; 2929 else 2930 memcpy(&id->sel, &xp->selector, sizeof(id->sel)); 2931 2932 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p)); 2933 err = -EMSGSIZE; 2934 if (attr == NULL) 2935 goto out_free_skb; 2936 2937 p = nla_data(attr); 2938 } 2939 2940 copy_to_user_policy(xp, p, dir); 2941 err = copy_to_user_tmpl(xp, skb); 2942 if (!err) 2943 err = copy_to_user_policy_type(xp->type, skb); 2944 if (!err) 2945 err = xfrm_mark_put(skb, &xp->mark); 2946 if (err) 2947 goto out_free_skb; 2948 2949 nlmsg_end(skb, nlh); 2950 2951 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 2952 2953 out_free_skb: 2954 kfree_skb(skb); 2955 return err; 2956 } 2957 2958 static int xfrm_notify_policy_flush(const struct km_event *c) 2959 { 2960 struct net *net = c->net; 2961 struct nlmsghdr *nlh; 2962 struct sk_buff *skb; 2963 int err; 2964 2965 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC); 2966 if (skb == NULL) 2967 return -ENOMEM; 2968 2969 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0); 2970 err = -EMSGSIZE; 2971 if (nlh == NULL) 2972 goto out_free_skb; 2973 err = copy_to_user_policy_type(c->data.type, skb); 2974 if (err) 2975 goto out_free_skb; 2976 2977 nlmsg_end(skb, nlh); 2978 2979 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 2980 2981 out_free_skb: 2982 kfree_skb(skb); 2983 return err; 2984 } 2985 2986 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 2987 { 2988 2989 switch (c->event) { 2990 case XFRM_MSG_NEWPOLICY: 2991 case XFRM_MSG_UPDPOLICY: 2992 case XFRM_MSG_DELPOLICY: 2993 return xfrm_notify_policy(xp, dir, c); 2994 case XFRM_MSG_FLUSHPOLICY: 2995 return xfrm_notify_policy_flush(c); 2996 case XFRM_MSG_POLEXPIRE: 2997 return xfrm_exp_policy_notify(xp, dir, c); 2998 default: 2999 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n", 3000 c->event); 3001 } 3002 3003 return 0; 3004 3005 } 3006 3007 static inline size_t xfrm_report_msgsize(void) 3008 { 3009 return NLMSG_ALIGN(sizeof(struct xfrm_user_report)); 3010 } 3011 3012 static int build_report(struct sk_buff *skb, u8 proto, 3013 struct xfrm_selector *sel, xfrm_address_t *addr) 3014 { 3015 struct xfrm_user_report *ur; 3016 struct nlmsghdr *nlh; 3017 3018 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0); 3019 if (nlh == NULL) 3020 return -EMSGSIZE; 3021 3022 ur = nlmsg_data(nlh); 3023 ur->proto = proto; 3024 memcpy(&ur->sel, sel, sizeof(ur->sel)); 3025 3026 if (addr) { 3027 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr); 3028 if (err) { 3029 nlmsg_cancel(skb, nlh); 3030 return err; 3031 } 3032 } 3033 nlmsg_end(skb, nlh); 3034 return 0; 3035 } 3036 3037 static int xfrm_send_report(struct net *net, u8 proto, 3038 struct xfrm_selector *sel, xfrm_address_t *addr) 3039 { 3040 struct sk_buff *skb; 3041 3042 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC); 3043 if (skb == NULL) 3044 return -ENOMEM; 3045 3046 if (build_report(skb, proto, sel, addr) < 0) 3047 BUG(); 3048 3049 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT); 3050 } 3051 3052 static inline size_t xfrm_mapping_msgsize(void) 3053 { 3054 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping)); 3055 } 3056 3057 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x, 3058 xfrm_address_t *new_saddr, __be16 new_sport) 3059 { 3060 struct xfrm_user_mapping *um; 3061 struct nlmsghdr *nlh; 3062 3063 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0); 3064 if (nlh == NULL) 3065 return -EMSGSIZE; 3066 3067 um = nlmsg_data(nlh); 3068 3069 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr)); 3070 um->id.spi = x->id.spi; 3071 um->id.family = x->props.family; 3072 um->id.proto = x->id.proto; 3073 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr)); 3074 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr)); 3075 um->new_sport = new_sport; 3076 um->old_sport = x->encap->encap_sport; 3077 um->reqid = x->props.reqid; 3078 3079 nlmsg_end(skb, nlh); 3080 return 0; 3081 } 3082 3083 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, 3084 __be16 sport) 3085 { 3086 struct net *net = xs_net(x); 3087 struct sk_buff *skb; 3088 3089 if (x->id.proto != IPPROTO_ESP) 3090 return -EINVAL; 3091 3092 if (!x->encap) 3093 return -EINVAL; 3094 3095 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC); 3096 if (skb == NULL) 3097 return -ENOMEM; 3098 3099 if (build_mapping(skb, x, ipaddr, sport) < 0) 3100 BUG(); 3101 3102 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING); 3103 } 3104 3105 static bool xfrm_is_alive(const struct km_event *c) 3106 { 3107 return (bool)xfrm_acquire_is_on(c->net); 3108 } 3109 3110 static struct xfrm_mgr netlink_mgr = { 3111 .id = "netlink", 3112 .notify = xfrm_send_state_notify, 3113 .acquire = xfrm_send_acquire, 3114 .compile_policy = xfrm_compile_policy, 3115 .notify_policy = xfrm_send_policy_notify, 3116 .report = xfrm_send_report, 3117 .migrate = xfrm_send_migrate, 3118 .new_mapping = xfrm_send_mapping, 3119 .is_alive = xfrm_is_alive, 3120 }; 3121 3122 static int __net_init xfrm_user_net_init(struct net *net) 3123 { 3124 struct sock *nlsk; 3125 struct netlink_kernel_cfg cfg = { 3126 .groups = XFRMNLGRP_MAX, 3127 .input = xfrm_netlink_rcv, 3128 }; 3129 3130 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg); 3131 if (nlsk == NULL) 3132 return -ENOMEM; 3133 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */ 3134 rcu_assign_pointer(net->xfrm.nlsk, nlsk); 3135 return 0; 3136 } 3137 3138 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list) 3139 { 3140 struct net *net; 3141 list_for_each_entry(net, net_exit_list, exit_list) 3142 RCU_INIT_POINTER(net->xfrm.nlsk, NULL); 3143 synchronize_net(); 3144 list_for_each_entry(net, net_exit_list, exit_list) 3145 netlink_kernel_release(net->xfrm.nlsk_stash); 3146 } 3147 3148 static struct pernet_operations xfrm_user_net_ops = { 3149 .init = xfrm_user_net_init, 3150 .exit_batch = xfrm_user_net_exit, 3151 }; 3152 3153 static int __init xfrm_user_init(void) 3154 { 3155 int rv; 3156 3157 printk(KERN_INFO "Initializing XFRM netlink socket\n"); 3158 3159 rv = register_pernet_subsys(&xfrm_user_net_ops); 3160 if (rv < 0) 3161 return rv; 3162 rv = xfrm_register_km(&netlink_mgr); 3163 if (rv < 0) 3164 unregister_pernet_subsys(&xfrm_user_net_ops); 3165 return rv; 3166 } 3167 3168 static void __exit xfrm_user_exit(void) 3169 { 3170 xfrm_unregister_km(&netlink_mgr); 3171 unregister_pernet_subsys(&xfrm_user_net_ops); 3172 } 3173 3174 module_init(xfrm_user_init); 3175 module_exit(xfrm_user_exit); 3176 MODULE_LICENSE("GPL"); 3177 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM); 3178 3179