1 // SPDX-License-Identifier: GPL-2.0-only 2 /* xfrm_user.c: User interface to configure xfrm engine. 3 * 4 * Copyright (C) 2002 David S. Miller (davem@redhat.com) 5 * 6 * Changes: 7 * Mitsuru KANDA @USAGI 8 * Kazunori MIYAZAWA @USAGI 9 * Kunihiro Ishiguro <kunihiro@ipinfusion.com> 10 * IPv6 support 11 * 12 */ 13 14 #include <linux/compat.h> 15 #include <linux/crypto.h> 16 #include <linux/module.h> 17 #include <linux/kernel.h> 18 #include <linux/types.h> 19 #include <linux/slab.h> 20 #include <linux/socket.h> 21 #include <linux/string.h> 22 #include <linux/net.h> 23 #include <linux/skbuff.h> 24 #include <linux/pfkeyv2.h> 25 #include <linux/ipsec.h> 26 #include <linux/init.h> 27 #include <linux/security.h> 28 #include <net/sock.h> 29 #include <net/xfrm.h> 30 #include <net/netlink.h> 31 #include <net/ah.h> 32 #include <linux/uaccess.h> 33 #if IS_ENABLED(CONFIG_IPV6) 34 #include <linux/in6.h> 35 #endif 36 #include <asm/unaligned.h> 37 38 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type) 39 { 40 struct nlattr *rt = attrs[type]; 41 struct xfrm_algo *algp; 42 43 if (!rt) 44 return 0; 45 46 algp = nla_data(rt); 47 if (nla_len(rt) < (int)xfrm_alg_len(algp)) 48 return -EINVAL; 49 50 switch (type) { 51 case XFRMA_ALG_AUTH: 52 case XFRMA_ALG_CRYPT: 53 case XFRMA_ALG_COMP: 54 break; 55 56 default: 57 return -EINVAL; 58 } 59 60 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0'; 61 return 0; 62 } 63 64 static int verify_auth_trunc(struct nlattr **attrs) 65 { 66 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC]; 67 struct xfrm_algo_auth *algp; 68 69 if (!rt) 70 return 0; 71 72 algp = nla_data(rt); 73 if (nla_len(rt) < (int)xfrm_alg_auth_len(algp)) 74 return -EINVAL; 75 76 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0'; 77 return 0; 78 } 79 80 static int verify_aead(struct nlattr **attrs) 81 { 82 struct nlattr *rt = attrs[XFRMA_ALG_AEAD]; 83 struct xfrm_algo_aead *algp; 84 85 if (!rt) 86 return 0; 87 88 algp = nla_data(rt); 89 if (nla_len(rt) < (int)aead_len(algp)) 90 return -EINVAL; 91 92 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0'; 93 return 0; 94 } 95 96 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type, 97 xfrm_address_t **addrp) 98 { 99 struct nlattr *rt = attrs[type]; 100 101 if (rt && addrp) 102 *addrp = nla_data(rt); 103 } 104 105 static inline int verify_sec_ctx_len(struct nlattr **attrs) 106 { 107 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 108 struct xfrm_user_sec_ctx *uctx; 109 110 if (!rt) 111 return 0; 112 113 uctx = nla_data(rt); 114 if (uctx->len > nla_len(rt) || 115 uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len)) 116 return -EINVAL; 117 118 return 0; 119 } 120 121 static inline int verify_replay(struct xfrm_usersa_info *p, 122 struct nlattr **attrs) 123 { 124 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL]; 125 struct xfrm_replay_state_esn *rs; 126 127 if (!rt) 128 return (p->flags & XFRM_STATE_ESN) ? -EINVAL : 0; 129 130 rs = nla_data(rt); 131 132 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8) 133 return -EINVAL; 134 135 if (nla_len(rt) < (int)xfrm_replay_state_esn_len(rs) && 136 nla_len(rt) != sizeof(*rs)) 137 return -EINVAL; 138 139 /* As only ESP and AH support ESN feature. */ 140 if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH)) 141 return -EINVAL; 142 143 if (p->replay_window != 0) 144 return -EINVAL; 145 146 return 0; 147 } 148 149 static int verify_newsa_info(struct xfrm_usersa_info *p, 150 struct nlattr **attrs) 151 { 152 int err; 153 154 err = -EINVAL; 155 switch (p->family) { 156 case AF_INET: 157 break; 158 159 case AF_INET6: 160 #if IS_ENABLED(CONFIG_IPV6) 161 break; 162 #else 163 err = -EAFNOSUPPORT; 164 goto out; 165 #endif 166 167 default: 168 goto out; 169 } 170 171 switch (p->sel.family) { 172 case AF_UNSPEC: 173 break; 174 175 case AF_INET: 176 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32) 177 goto out; 178 179 break; 180 181 case AF_INET6: 182 #if IS_ENABLED(CONFIG_IPV6) 183 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128) 184 goto out; 185 186 break; 187 #else 188 err = -EAFNOSUPPORT; 189 goto out; 190 #endif 191 192 default: 193 goto out; 194 } 195 196 err = -EINVAL; 197 switch (p->id.proto) { 198 case IPPROTO_AH: 199 if ((!attrs[XFRMA_ALG_AUTH] && 200 !attrs[XFRMA_ALG_AUTH_TRUNC]) || 201 attrs[XFRMA_ALG_AEAD] || 202 attrs[XFRMA_ALG_CRYPT] || 203 attrs[XFRMA_ALG_COMP] || 204 attrs[XFRMA_TFCPAD]) 205 goto out; 206 break; 207 208 case IPPROTO_ESP: 209 if (attrs[XFRMA_ALG_COMP]) 210 goto out; 211 if (!attrs[XFRMA_ALG_AUTH] && 212 !attrs[XFRMA_ALG_AUTH_TRUNC] && 213 !attrs[XFRMA_ALG_CRYPT] && 214 !attrs[XFRMA_ALG_AEAD]) 215 goto out; 216 if ((attrs[XFRMA_ALG_AUTH] || 217 attrs[XFRMA_ALG_AUTH_TRUNC] || 218 attrs[XFRMA_ALG_CRYPT]) && 219 attrs[XFRMA_ALG_AEAD]) 220 goto out; 221 if (attrs[XFRMA_TFCPAD] && 222 p->mode != XFRM_MODE_TUNNEL) 223 goto out; 224 break; 225 226 case IPPROTO_COMP: 227 if (!attrs[XFRMA_ALG_COMP] || 228 attrs[XFRMA_ALG_AEAD] || 229 attrs[XFRMA_ALG_AUTH] || 230 attrs[XFRMA_ALG_AUTH_TRUNC] || 231 attrs[XFRMA_ALG_CRYPT] || 232 attrs[XFRMA_TFCPAD] || 233 (ntohl(p->id.spi) >= 0x10000)) 234 goto out; 235 break; 236 237 #if IS_ENABLED(CONFIG_IPV6) 238 case IPPROTO_DSTOPTS: 239 case IPPROTO_ROUTING: 240 if (attrs[XFRMA_ALG_COMP] || 241 attrs[XFRMA_ALG_AUTH] || 242 attrs[XFRMA_ALG_AUTH_TRUNC] || 243 attrs[XFRMA_ALG_AEAD] || 244 attrs[XFRMA_ALG_CRYPT] || 245 attrs[XFRMA_ENCAP] || 246 attrs[XFRMA_SEC_CTX] || 247 attrs[XFRMA_TFCPAD] || 248 !attrs[XFRMA_COADDR]) 249 goto out; 250 break; 251 #endif 252 253 default: 254 goto out; 255 } 256 257 if ((err = verify_aead(attrs))) 258 goto out; 259 if ((err = verify_auth_trunc(attrs))) 260 goto out; 261 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH))) 262 goto out; 263 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT))) 264 goto out; 265 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP))) 266 goto out; 267 if ((err = verify_sec_ctx_len(attrs))) 268 goto out; 269 if ((err = verify_replay(p, attrs))) 270 goto out; 271 272 err = -EINVAL; 273 switch (p->mode) { 274 case XFRM_MODE_TRANSPORT: 275 case XFRM_MODE_TUNNEL: 276 case XFRM_MODE_ROUTEOPTIMIZATION: 277 case XFRM_MODE_BEET: 278 break; 279 280 default: 281 goto out; 282 } 283 284 err = 0; 285 286 if (attrs[XFRMA_MTIMER_THRESH]) 287 if (!attrs[XFRMA_ENCAP]) 288 err = -EINVAL; 289 290 out: 291 return err; 292 } 293 294 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props, 295 struct xfrm_algo_desc *(*get_byname)(const char *, int), 296 struct nlattr *rta) 297 { 298 struct xfrm_algo *p, *ualg; 299 struct xfrm_algo_desc *algo; 300 301 if (!rta) 302 return 0; 303 304 ualg = nla_data(rta); 305 306 algo = get_byname(ualg->alg_name, 1); 307 if (!algo) 308 return -ENOSYS; 309 *props = algo->desc.sadb_alg_id; 310 311 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL); 312 if (!p) 313 return -ENOMEM; 314 315 strcpy(p->alg_name, algo->name); 316 *algpp = p; 317 return 0; 318 } 319 320 static int attach_crypt(struct xfrm_state *x, struct nlattr *rta) 321 { 322 struct xfrm_algo *p, *ualg; 323 struct xfrm_algo_desc *algo; 324 325 if (!rta) 326 return 0; 327 328 ualg = nla_data(rta); 329 330 algo = xfrm_ealg_get_byname(ualg->alg_name, 1); 331 if (!algo) 332 return -ENOSYS; 333 x->props.ealgo = algo->desc.sadb_alg_id; 334 335 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL); 336 if (!p) 337 return -ENOMEM; 338 339 strcpy(p->alg_name, algo->name); 340 x->ealg = p; 341 x->geniv = algo->uinfo.encr.geniv; 342 return 0; 343 } 344 345 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props, 346 struct nlattr *rta) 347 { 348 struct xfrm_algo *ualg; 349 struct xfrm_algo_auth *p; 350 struct xfrm_algo_desc *algo; 351 352 if (!rta) 353 return 0; 354 355 ualg = nla_data(rta); 356 357 algo = xfrm_aalg_get_byname(ualg->alg_name, 1); 358 if (!algo) 359 return -ENOSYS; 360 *props = algo->desc.sadb_alg_id; 361 362 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL); 363 if (!p) 364 return -ENOMEM; 365 366 strcpy(p->alg_name, algo->name); 367 p->alg_key_len = ualg->alg_key_len; 368 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; 369 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8); 370 371 *algpp = p; 372 return 0; 373 } 374 375 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props, 376 struct nlattr *rta) 377 { 378 struct xfrm_algo_auth *p, *ualg; 379 struct xfrm_algo_desc *algo; 380 381 if (!rta) 382 return 0; 383 384 ualg = nla_data(rta); 385 386 algo = xfrm_aalg_get_byname(ualg->alg_name, 1); 387 if (!algo) 388 return -ENOSYS; 389 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits) 390 return -EINVAL; 391 *props = algo->desc.sadb_alg_id; 392 393 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL); 394 if (!p) 395 return -ENOMEM; 396 397 strcpy(p->alg_name, algo->name); 398 if (!p->alg_trunc_len) 399 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; 400 401 *algpp = p; 402 return 0; 403 } 404 405 static int attach_aead(struct xfrm_state *x, struct nlattr *rta) 406 { 407 struct xfrm_algo_aead *p, *ualg; 408 struct xfrm_algo_desc *algo; 409 410 if (!rta) 411 return 0; 412 413 ualg = nla_data(rta); 414 415 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1); 416 if (!algo) 417 return -ENOSYS; 418 x->props.ealgo = algo->desc.sadb_alg_id; 419 420 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL); 421 if (!p) 422 return -ENOMEM; 423 424 strcpy(p->alg_name, algo->name); 425 x->aead = p; 426 x->geniv = algo->uinfo.aead.geniv; 427 return 0; 428 } 429 430 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn, 431 struct nlattr *rp) 432 { 433 struct xfrm_replay_state_esn *up; 434 unsigned int ulen; 435 436 if (!replay_esn || !rp) 437 return 0; 438 439 up = nla_data(rp); 440 ulen = xfrm_replay_state_esn_len(up); 441 442 /* Check the overall length and the internal bitmap length to avoid 443 * potential overflow. */ 444 if (nla_len(rp) < (int)ulen || 445 xfrm_replay_state_esn_len(replay_esn) != ulen || 446 replay_esn->bmp_len != up->bmp_len) 447 return -EINVAL; 448 449 if (up->replay_window > up->bmp_len * sizeof(__u32) * 8) 450 return -EINVAL; 451 452 return 0; 453 } 454 455 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn, 456 struct xfrm_replay_state_esn **preplay_esn, 457 struct nlattr *rta) 458 { 459 struct xfrm_replay_state_esn *p, *pp, *up; 460 unsigned int klen, ulen; 461 462 if (!rta) 463 return 0; 464 465 up = nla_data(rta); 466 klen = xfrm_replay_state_esn_len(up); 467 ulen = nla_len(rta) >= (int)klen ? klen : sizeof(*up); 468 469 p = kzalloc(klen, GFP_KERNEL); 470 if (!p) 471 return -ENOMEM; 472 473 pp = kzalloc(klen, GFP_KERNEL); 474 if (!pp) { 475 kfree(p); 476 return -ENOMEM; 477 } 478 479 memcpy(p, up, ulen); 480 memcpy(pp, up, ulen); 481 482 *replay_esn = p; 483 *preplay_esn = pp; 484 485 return 0; 486 } 487 488 static inline unsigned int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx) 489 { 490 unsigned int len = 0; 491 492 if (xfrm_ctx) { 493 len += sizeof(struct xfrm_user_sec_ctx); 494 len += xfrm_ctx->ctx_len; 495 } 496 return len; 497 } 498 499 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 500 { 501 memcpy(&x->id, &p->id, sizeof(x->id)); 502 memcpy(&x->sel, &p->sel, sizeof(x->sel)); 503 memcpy(&x->lft, &p->lft, sizeof(x->lft)); 504 x->props.mode = p->mode; 505 x->props.replay_window = min_t(unsigned int, p->replay_window, 506 sizeof(x->replay.bitmap) * 8); 507 x->props.reqid = p->reqid; 508 x->props.family = p->family; 509 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr)); 510 x->props.flags = p->flags; 511 512 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC)) 513 x->sel.family = p->family; 514 } 515 516 /* 517 * someday when pfkey also has support, we could have the code 518 * somehow made shareable and move it to xfrm_state.c - JHS 519 * 520 */ 521 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs, 522 int update_esn) 523 { 524 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 525 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL; 526 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 527 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; 528 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; 529 struct nlattr *mt = attrs[XFRMA_MTIMER_THRESH]; 530 531 if (re) { 532 struct xfrm_replay_state_esn *replay_esn; 533 replay_esn = nla_data(re); 534 memcpy(x->replay_esn, replay_esn, 535 xfrm_replay_state_esn_len(replay_esn)); 536 memcpy(x->preplay_esn, replay_esn, 537 xfrm_replay_state_esn_len(replay_esn)); 538 } 539 540 if (rp) { 541 struct xfrm_replay_state *replay; 542 replay = nla_data(rp); 543 memcpy(&x->replay, replay, sizeof(*replay)); 544 memcpy(&x->preplay, replay, sizeof(*replay)); 545 } 546 547 if (lt) { 548 struct xfrm_lifetime_cur *ltime; 549 ltime = nla_data(lt); 550 x->curlft.bytes = ltime->bytes; 551 x->curlft.packets = ltime->packets; 552 x->curlft.add_time = ltime->add_time; 553 x->curlft.use_time = ltime->use_time; 554 } 555 556 if (et) 557 x->replay_maxage = nla_get_u32(et); 558 559 if (rt) 560 x->replay_maxdiff = nla_get_u32(rt); 561 562 if (mt) 563 x->mapping_maxage = nla_get_u32(mt); 564 } 565 566 static void xfrm_smark_init(struct nlattr **attrs, struct xfrm_mark *m) 567 { 568 if (attrs[XFRMA_SET_MARK]) { 569 m->v = nla_get_u32(attrs[XFRMA_SET_MARK]); 570 if (attrs[XFRMA_SET_MARK_MASK]) 571 m->m = nla_get_u32(attrs[XFRMA_SET_MARK_MASK]); 572 else 573 m->m = 0xffffffff; 574 } else { 575 m->v = m->m = 0; 576 } 577 } 578 579 static struct xfrm_state *xfrm_state_construct(struct net *net, 580 struct xfrm_usersa_info *p, 581 struct nlattr **attrs, 582 int *errp) 583 { 584 struct xfrm_state *x = xfrm_state_alloc(net); 585 int err = -ENOMEM; 586 587 if (!x) 588 goto error_no_put; 589 590 copy_from_user_state(x, p); 591 592 if (attrs[XFRMA_ENCAP]) { 593 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]), 594 sizeof(*x->encap), GFP_KERNEL); 595 if (x->encap == NULL) 596 goto error; 597 } 598 599 if (attrs[XFRMA_COADDR]) { 600 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]), 601 sizeof(*x->coaddr), GFP_KERNEL); 602 if (x->coaddr == NULL) 603 goto error; 604 } 605 606 if (attrs[XFRMA_SA_EXTRA_FLAGS]) 607 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]); 608 609 if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD]))) 610 goto error; 611 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo, 612 attrs[XFRMA_ALG_AUTH_TRUNC]))) 613 goto error; 614 if (!x->props.aalgo) { 615 if ((err = attach_auth(&x->aalg, &x->props.aalgo, 616 attrs[XFRMA_ALG_AUTH]))) 617 goto error; 618 } 619 if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT]))) 620 goto error; 621 if ((err = attach_one_algo(&x->calg, &x->props.calgo, 622 xfrm_calg_get_byname, 623 attrs[XFRMA_ALG_COMP]))) 624 goto error; 625 626 if (attrs[XFRMA_TFCPAD]) 627 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]); 628 629 xfrm_mark_get(attrs, &x->mark); 630 631 xfrm_smark_init(attrs, &x->props.smark); 632 633 if (attrs[XFRMA_IF_ID]) { 634 x->if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 635 if (!x->if_id) { 636 err = -EINVAL; 637 goto error; 638 } 639 } 640 641 err = __xfrm_init_state(x, false, attrs[XFRMA_OFFLOAD_DEV]); 642 if (err) 643 goto error; 644 645 if (attrs[XFRMA_SEC_CTX]) { 646 err = security_xfrm_state_alloc(x, 647 nla_data(attrs[XFRMA_SEC_CTX])); 648 if (err) 649 goto error; 650 } 651 652 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn, 653 attrs[XFRMA_REPLAY_ESN_VAL]))) 654 goto error; 655 656 x->km.seq = p->seq; 657 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth; 658 /* sysctl_xfrm_aevent_etime is in 100ms units */ 659 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M; 660 661 if ((err = xfrm_init_replay(x))) 662 goto error; 663 664 /* override default values from above */ 665 xfrm_update_ae_params(x, attrs, 0); 666 667 /* configure the hardware if offload is requested */ 668 if (attrs[XFRMA_OFFLOAD_DEV]) { 669 err = xfrm_dev_state_add(net, x, 670 nla_data(attrs[XFRMA_OFFLOAD_DEV])); 671 if (err) 672 goto error; 673 } 674 675 return x; 676 677 error: 678 x->km.state = XFRM_STATE_DEAD; 679 xfrm_state_put(x); 680 error_no_put: 681 *errp = err; 682 return NULL; 683 } 684 685 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 686 struct nlattr **attrs) 687 { 688 struct net *net = sock_net(skb->sk); 689 struct xfrm_usersa_info *p = nlmsg_data(nlh); 690 struct xfrm_state *x; 691 int err; 692 struct km_event c; 693 694 err = verify_newsa_info(p, attrs); 695 if (err) 696 return err; 697 698 x = xfrm_state_construct(net, p, attrs, &err); 699 if (!x) 700 return err; 701 702 xfrm_state_hold(x); 703 if (nlh->nlmsg_type == XFRM_MSG_NEWSA) 704 err = xfrm_state_add(x); 705 else 706 err = xfrm_state_update(x); 707 708 xfrm_audit_state_add(x, err ? 0 : 1, true); 709 710 if (err < 0) { 711 x->km.state = XFRM_STATE_DEAD; 712 xfrm_dev_state_delete(x); 713 __xfrm_state_put(x); 714 goto out; 715 } 716 717 if (x->km.state == XFRM_STATE_VOID) 718 x->km.state = XFRM_STATE_VALID; 719 720 c.seq = nlh->nlmsg_seq; 721 c.portid = nlh->nlmsg_pid; 722 c.event = nlh->nlmsg_type; 723 724 km_state_notify(x, &c); 725 out: 726 xfrm_state_put(x); 727 return err; 728 } 729 730 static struct xfrm_state *xfrm_user_state_lookup(struct net *net, 731 struct xfrm_usersa_id *p, 732 struct nlattr **attrs, 733 int *errp) 734 { 735 struct xfrm_state *x = NULL; 736 struct xfrm_mark m; 737 int err; 738 u32 mark = xfrm_mark_get(attrs, &m); 739 740 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) { 741 err = -ESRCH; 742 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family); 743 } else { 744 xfrm_address_t *saddr = NULL; 745 746 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr); 747 if (!saddr) { 748 err = -EINVAL; 749 goto out; 750 } 751 752 err = -ESRCH; 753 x = xfrm_state_lookup_byaddr(net, mark, 754 &p->daddr, saddr, 755 p->proto, p->family); 756 } 757 758 out: 759 if (!x && errp) 760 *errp = err; 761 return x; 762 } 763 764 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 765 struct nlattr **attrs) 766 { 767 struct net *net = sock_net(skb->sk); 768 struct xfrm_state *x; 769 int err = -ESRCH; 770 struct km_event c; 771 struct xfrm_usersa_id *p = nlmsg_data(nlh); 772 773 x = xfrm_user_state_lookup(net, p, attrs, &err); 774 if (x == NULL) 775 return err; 776 777 if ((err = security_xfrm_state_delete(x)) != 0) 778 goto out; 779 780 if (xfrm_state_kern(x)) { 781 err = -EPERM; 782 goto out; 783 } 784 785 err = xfrm_state_delete(x); 786 787 if (err < 0) 788 goto out; 789 790 c.seq = nlh->nlmsg_seq; 791 c.portid = nlh->nlmsg_pid; 792 c.event = nlh->nlmsg_type; 793 km_state_notify(x, &c); 794 795 out: 796 xfrm_audit_state_delete(x, err ? 0 : 1, true); 797 xfrm_state_put(x); 798 return err; 799 } 800 801 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 802 { 803 memset(p, 0, sizeof(*p)); 804 memcpy(&p->id, &x->id, sizeof(p->id)); 805 memcpy(&p->sel, &x->sel, sizeof(p->sel)); 806 memcpy(&p->lft, &x->lft, sizeof(p->lft)); 807 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft)); 808 put_unaligned(x->stats.replay_window, &p->stats.replay_window); 809 put_unaligned(x->stats.replay, &p->stats.replay); 810 put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed); 811 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr)); 812 p->mode = x->props.mode; 813 p->replay_window = x->props.replay_window; 814 p->reqid = x->props.reqid; 815 p->family = x->props.family; 816 p->flags = x->props.flags; 817 p->seq = x->km.seq; 818 } 819 820 struct xfrm_dump_info { 821 struct sk_buff *in_skb; 822 struct sk_buff *out_skb; 823 u32 nlmsg_seq; 824 u16 nlmsg_flags; 825 }; 826 827 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb) 828 { 829 struct xfrm_user_sec_ctx *uctx; 830 struct nlattr *attr; 831 int ctx_size = sizeof(*uctx) + s->ctx_len; 832 833 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size); 834 if (attr == NULL) 835 return -EMSGSIZE; 836 837 uctx = nla_data(attr); 838 uctx->exttype = XFRMA_SEC_CTX; 839 uctx->len = ctx_size; 840 uctx->ctx_doi = s->ctx_doi; 841 uctx->ctx_alg = s->ctx_alg; 842 uctx->ctx_len = s->ctx_len; 843 memcpy(uctx + 1, s->ctx_str, s->ctx_len); 844 845 return 0; 846 } 847 848 static int copy_user_offload(struct xfrm_state_offload *xso, struct sk_buff *skb) 849 { 850 struct xfrm_user_offload *xuo; 851 struct nlattr *attr; 852 853 attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo)); 854 if (attr == NULL) 855 return -EMSGSIZE; 856 857 xuo = nla_data(attr); 858 memset(xuo, 0, sizeof(*xuo)); 859 xuo->ifindex = xso->dev->ifindex; 860 xuo->flags = xso->flags; 861 862 return 0; 863 } 864 865 static bool xfrm_redact(void) 866 { 867 return IS_ENABLED(CONFIG_SECURITY) && 868 security_locked_down(LOCKDOWN_XFRM_SECRET); 869 } 870 871 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb) 872 { 873 struct xfrm_algo *algo; 874 struct xfrm_algo_auth *ap; 875 struct nlattr *nla; 876 bool redact_secret = xfrm_redact(); 877 878 nla = nla_reserve(skb, XFRMA_ALG_AUTH, 879 sizeof(*algo) + (auth->alg_key_len + 7) / 8); 880 if (!nla) 881 return -EMSGSIZE; 882 algo = nla_data(nla); 883 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name)); 884 885 if (redact_secret && auth->alg_key_len) 886 memset(algo->alg_key, 0, (auth->alg_key_len + 7) / 8); 887 else 888 memcpy(algo->alg_key, auth->alg_key, 889 (auth->alg_key_len + 7) / 8); 890 algo->alg_key_len = auth->alg_key_len; 891 892 nla = nla_reserve(skb, XFRMA_ALG_AUTH_TRUNC, xfrm_alg_auth_len(auth)); 893 if (!nla) 894 return -EMSGSIZE; 895 ap = nla_data(nla); 896 memcpy(ap, auth, sizeof(struct xfrm_algo_auth)); 897 if (redact_secret && auth->alg_key_len) 898 memset(ap->alg_key, 0, (auth->alg_key_len + 7) / 8); 899 else 900 memcpy(ap->alg_key, auth->alg_key, 901 (auth->alg_key_len + 7) / 8); 902 return 0; 903 } 904 905 static int copy_to_user_aead(struct xfrm_algo_aead *aead, struct sk_buff *skb) 906 { 907 struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_AEAD, aead_len(aead)); 908 struct xfrm_algo_aead *ap; 909 bool redact_secret = xfrm_redact(); 910 911 if (!nla) 912 return -EMSGSIZE; 913 914 ap = nla_data(nla); 915 memcpy(ap, aead, sizeof(*aead)); 916 917 if (redact_secret && aead->alg_key_len) 918 memset(ap->alg_key, 0, (aead->alg_key_len + 7) / 8); 919 else 920 memcpy(ap->alg_key, aead->alg_key, 921 (aead->alg_key_len + 7) / 8); 922 return 0; 923 } 924 925 static int copy_to_user_ealg(struct xfrm_algo *ealg, struct sk_buff *skb) 926 { 927 struct xfrm_algo *ap; 928 bool redact_secret = xfrm_redact(); 929 struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_CRYPT, 930 xfrm_alg_len(ealg)); 931 if (!nla) 932 return -EMSGSIZE; 933 934 ap = nla_data(nla); 935 memcpy(ap, ealg, sizeof(*ealg)); 936 937 if (redact_secret && ealg->alg_key_len) 938 memset(ap->alg_key, 0, (ealg->alg_key_len + 7) / 8); 939 else 940 memcpy(ap->alg_key, ealg->alg_key, 941 (ealg->alg_key_len + 7) / 8); 942 943 return 0; 944 } 945 946 static int xfrm_smark_put(struct sk_buff *skb, struct xfrm_mark *m) 947 { 948 int ret = 0; 949 950 if (m->v | m->m) { 951 ret = nla_put_u32(skb, XFRMA_SET_MARK, m->v); 952 if (!ret) 953 ret = nla_put_u32(skb, XFRMA_SET_MARK_MASK, m->m); 954 } 955 return ret; 956 } 957 958 /* Don't change this without updating xfrm_sa_len! */ 959 static int copy_to_user_state_extra(struct xfrm_state *x, 960 struct xfrm_usersa_info *p, 961 struct sk_buff *skb) 962 { 963 int ret = 0; 964 965 copy_to_user_state(x, p); 966 967 if (x->props.extra_flags) { 968 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS, 969 x->props.extra_flags); 970 if (ret) 971 goto out; 972 } 973 974 if (x->coaddr) { 975 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr); 976 if (ret) 977 goto out; 978 } 979 if (x->lastused) { 980 ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused, 981 XFRMA_PAD); 982 if (ret) 983 goto out; 984 } 985 if (x->aead) { 986 ret = copy_to_user_aead(x->aead, skb); 987 if (ret) 988 goto out; 989 } 990 if (x->aalg) { 991 ret = copy_to_user_auth(x->aalg, skb); 992 if (ret) 993 goto out; 994 } 995 if (x->ealg) { 996 ret = copy_to_user_ealg(x->ealg, skb); 997 if (ret) 998 goto out; 999 } 1000 if (x->calg) { 1001 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg); 1002 if (ret) 1003 goto out; 1004 } 1005 if (x->encap) { 1006 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap); 1007 if (ret) 1008 goto out; 1009 } 1010 if (x->tfcpad) { 1011 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad); 1012 if (ret) 1013 goto out; 1014 } 1015 ret = xfrm_mark_put(skb, &x->mark); 1016 if (ret) 1017 goto out; 1018 1019 ret = xfrm_smark_put(skb, &x->props.smark); 1020 if (ret) 1021 goto out; 1022 1023 if (x->replay_esn) 1024 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL, 1025 xfrm_replay_state_esn_len(x->replay_esn), 1026 x->replay_esn); 1027 else 1028 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), 1029 &x->replay); 1030 if (ret) 1031 goto out; 1032 if(x->xso.dev) 1033 ret = copy_user_offload(&x->xso, skb); 1034 if (ret) 1035 goto out; 1036 if (x->if_id) { 1037 ret = nla_put_u32(skb, XFRMA_IF_ID, x->if_id); 1038 if (ret) 1039 goto out; 1040 } 1041 if (x->security) { 1042 ret = copy_sec_ctx(x->security, skb); 1043 if (ret) 1044 goto out; 1045 } 1046 if (x->mapping_maxage) 1047 ret = nla_put_u32(skb, XFRMA_MTIMER_THRESH, x->mapping_maxage); 1048 out: 1049 return ret; 1050 } 1051 1052 static int dump_one_state(struct xfrm_state *x, int count, void *ptr) 1053 { 1054 struct xfrm_dump_info *sp = ptr; 1055 struct sk_buff *in_skb = sp->in_skb; 1056 struct sk_buff *skb = sp->out_skb; 1057 struct xfrm_translator *xtr; 1058 struct xfrm_usersa_info *p; 1059 struct nlmsghdr *nlh; 1060 int err; 1061 1062 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, 1063 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags); 1064 if (nlh == NULL) 1065 return -EMSGSIZE; 1066 1067 p = nlmsg_data(nlh); 1068 1069 err = copy_to_user_state_extra(x, p, skb); 1070 if (err) { 1071 nlmsg_cancel(skb, nlh); 1072 return err; 1073 } 1074 nlmsg_end(skb, nlh); 1075 1076 xtr = xfrm_get_translator(); 1077 if (xtr) { 1078 err = xtr->alloc_compat(skb, nlh); 1079 1080 xfrm_put_translator(xtr); 1081 if (err) { 1082 nlmsg_cancel(skb, nlh); 1083 return err; 1084 } 1085 } 1086 1087 return 0; 1088 } 1089 1090 static int xfrm_dump_sa_done(struct netlink_callback *cb) 1091 { 1092 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 1093 struct sock *sk = cb->skb->sk; 1094 struct net *net = sock_net(sk); 1095 1096 if (cb->args[0]) 1097 xfrm_state_walk_done(walk, net); 1098 return 0; 1099 } 1100 1101 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb) 1102 { 1103 struct net *net = sock_net(skb->sk); 1104 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 1105 struct xfrm_dump_info info; 1106 1107 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) > 1108 sizeof(cb->args) - sizeof(cb->args[0])); 1109 1110 info.in_skb = cb->skb; 1111 info.out_skb = skb; 1112 info.nlmsg_seq = cb->nlh->nlmsg_seq; 1113 info.nlmsg_flags = NLM_F_MULTI; 1114 1115 if (!cb->args[0]) { 1116 struct nlattr *attrs[XFRMA_MAX+1]; 1117 struct xfrm_address_filter *filter = NULL; 1118 u8 proto = 0; 1119 int err; 1120 1121 err = nlmsg_parse_deprecated(cb->nlh, 0, attrs, XFRMA_MAX, 1122 xfrma_policy, cb->extack); 1123 if (err < 0) 1124 return err; 1125 1126 if (attrs[XFRMA_ADDRESS_FILTER]) { 1127 filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]), 1128 sizeof(*filter), GFP_KERNEL); 1129 if (filter == NULL) 1130 return -ENOMEM; 1131 } 1132 1133 if (attrs[XFRMA_PROTO]) 1134 proto = nla_get_u8(attrs[XFRMA_PROTO]); 1135 1136 xfrm_state_walk_init(walk, proto, filter); 1137 cb->args[0] = 1; 1138 } 1139 1140 (void) xfrm_state_walk(net, walk, dump_one_state, &info); 1141 1142 return skb->len; 1143 } 1144 1145 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb, 1146 struct xfrm_state *x, u32 seq) 1147 { 1148 struct xfrm_dump_info info; 1149 struct sk_buff *skb; 1150 int err; 1151 1152 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1153 if (!skb) 1154 return ERR_PTR(-ENOMEM); 1155 1156 info.in_skb = in_skb; 1157 info.out_skb = skb; 1158 info.nlmsg_seq = seq; 1159 info.nlmsg_flags = 0; 1160 1161 err = dump_one_state(x, 0, &info); 1162 if (err) { 1163 kfree_skb(skb); 1164 return ERR_PTR(err); 1165 } 1166 1167 return skb; 1168 } 1169 1170 /* A wrapper for nlmsg_multicast() checking that nlsk is still available. 1171 * Must be called with RCU read lock. 1172 */ 1173 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb, 1174 u32 pid, unsigned int group) 1175 { 1176 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk); 1177 struct xfrm_translator *xtr; 1178 1179 if (!nlsk) { 1180 kfree_skb(skb); 1181 return -EPIPE; 1182 } 1183 1184 xtr = xfrm_get_translator(); 1185 if (xtr) { 1186 int err = xtr->alloc_compat(skb, nlmsg_hdr(skb)); 1187 1188 xfrm_put_translator(xtr); 1189 if (err) { 1190 kfree_skb(skb); 1191 return err; 1192 } 1193 } 1194 1195 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC); 1196 } 1197 1198 static inline unsigned int xfrm_spdinfo_msgsize(void) 1199 { 1200 return NLMSG_ALIGN(4) 1201 + nla_total_size(sizeof(struct xfrmu_spdinfo)) 1202 + nla_total_size(sizeof(struct xfrmu_spdhinfo)) 1203 + nla_total_size(sizeof(struct xfrmu_spdhthresh)) 1204 + nla_total_size(sizeof(struct xfrmu_spdhthresh)); 1205 } 1206 1207 static int build_spdinfo(struct sk_buff *skb, struct net *net, 1208 u32 portid, u32 seq, u32 flags) 1209 { 1210 struct xfrmk_spdinfo si; 1211 struct xfrmu_spdinfo spc; 1212 struct xfrmu_spdhinfo sph; 1213 struct xfrmu_spdhthresh spt4, spt6; 1214 struct nlmsghdr *nlh; 1215 int err; 1216 u32 *f; 1217 unsigned lseq; 1218 1219 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0); 1220 if (nlh == NULL) /* shouldn't really happen ... */ 1221 return -EMSGSIZE; 1222 1223 f = nlmsg_data(nlh); 1224 *f = flags; 1225 xfrm_spd_getinfo(net, &si); 1226 spc.incnt = si.incnt; 1227 spc.outcnt = si.outcnt; 1228 spc.fwdcnt = si.fwdcnt; 1229 spc.inscnt = si.inscnt; 1230 spc.outscnt = si.outscnt; 1231 spc.fwdscnt = si.fwdscnt; 1232 sph.spdhcnt = si.spdhcnt; 1233 sph.spdhmcnt = si.spdhmcnt; 1234 1235 do { 1236 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock); 1237 1238 spt4.lbits = net->xfrm.policy_hthresh.lbits4; 1239 spt4.rbits = net->xfrm.policy_hthresh.rbits4; 1240 spt6.lbits = net->xfrm.policy_hthresh.lbits6; 1241 spt6.rbits = net->xfrm.policy_hthresh.rbits6; 1242 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq)); 1243 1244 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc); 1245 if (!err) 1246 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph); 1247 if (!err) 1248 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4); 1249 if (!err) 1250 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6); 1251 if (err) { 1252 nlmsg_cancel(skb, nlh); 1253 return err; 1254 } 1255 1256 nlmsg_end(skb, nlh); 1257 return 0; 1258 } 1259 1260 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1261 struct nlattr **attrs) 1262 { 1263 struct net *net = sock_net(skb->sk); 1264 struct xfrmu_spdhthresh *thresh4 = NULL; 1265 struct xfrmu_spdhthresh *thresh6 = NULL; 1266 1267 /* selector prefixlen thresholds to hash policies */ 1268 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) { 1269 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH]; 1270 1271 if (nla_len(rta) < sizeof(*thresh4)) 1272 return -EINVAL; 1273 thresh4 = nla_data(rta); 1274 if (thresh4->lbits > 32 || thresh4->rbits > 32) 1275 return -EINVAL; 1276 } 1277 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) { 1278 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH]; 1279 1280 if (nla_len(rta) < sizeof(*thresh6)) 1281 return -EINVAL; 1282 thresh6 = nla_data(rta); 1283 if (thresh6->lbits > 128 || thresh6->rbits > 128) 1284 return -EINVAL; 1285 } 1286 1287 if (thresh4 || thresh6) { 1288 write_seqlock(&net->xfrm.policy_hthresh.lock); 1289 if (thresh4) { 1290 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits; 1291 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits; 1292 } 1293 if (thresh6) { 1294 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits; 1295 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits; 1296 } 1297 write_sequnlock(&net->xfrm.policy_hthresh.lock); 1298 1299 xfrm_policy_hash_rebuild(net); 1300 } 1301 1302 return 0; 1303 } 1304 1305 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1306 struct nlattr **attrs) 1307 { 1308 struct net *net = sock_net(skb->sk); 1309 struct sk_buff *r_skb; 1310 u32 *flags = nlmsg_data(nlh); 1311 u32 sportid = NETLINK_CB(skb).portid; 1312 u32 seq = nlh->nlmsg_seq; 1313 int err; 1314 1315 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC); 1316 if (r_skb == NULL) 1317 return -ENOMEM; 1318 1319 err = build_spdinfo(r_skb, net, sportid, seq, *flags); 1320 BUG_ON(err < 0); 1321 1322 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); 1323 } 1324 1325 static inline unsigned int xfrm_sadinfo_msgsize(void) 1326 { 1327 return NLMSG_ALIGN(4) 1328 + nla_total_size(sizeof(struct xfrmu_sadhinfo)) 1329 + nla_total_size(4); /* XFRMA_SAD_CNT */ 1330 } 1331 1332 static int build_sadinfo(struct sk_buff *skb, struct net *net, 1333 u32 portid, u32 seq, u32 flags) 1334 { 1335 struct xfrmk_sadinfo si; 1336 struct xfrmu_sadhinfo sh; 1337 struct nlmsghdr *nlh; 1338 int err; 1339 u32 *f; 1340 1341 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0); 1342 if (nlh == NULL) /* shouldn't really happen ... */ 1343 return -EMSGSIZE; 1344 1345 f = nlmsg_data(nlh); 1346 *f = flags; 1347 xfrm_sad_getinfo(net, &si); 1348 1349 sh.sadhmcnt = si.sadhmcnt; 1350 sh.sadhcnt = si.sadhcnt; 1351 1352 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt); 1353 if (!err) 1354 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh); 1355 if (err) { 1356 nlmsg_cancel(skb, nlh); 1357 return err; 1358 } 1359 1360 nlmsg_end(skb, nlh); 1361 return 0; 1362 } 1363 1364 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1365 struct nlattr **attrs) 1366 { 1367 struct net *net = sock_net(skb->sk); 1368 struct sk_buff *r_skb; 1369 u32 *flags = nlmsg_data(nlh); 1370 u32 sportid = NETLINK_CB(skb).portid; 1371 u32 seq = nlh->nlmsg_seq; 1372 int err; 1373 1374 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC); 1375 if (r_skb == NULL) 1376 return -ENOMEM; 1377 1378 err = build_sadinfo(r_skb, net, sportid, seq, *flags); 1379 BUG_ON(err < 0); 1380 1381 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); 1382 } 1383 1384 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 1385 struct nlattr **attrs) 1386 { 1387 struct net *net = sock_net(skb->sk); 1388 struct xfrm_usersa_id *p = nlmsg_data(nlh); 1389 struct xfrm_state *x; 1390 struct sk_buff *resp_skb; 1391 int err = -ESRCH; 1392 1393 x = xfrm_user_state_lookup(net, p, attrs, &err); 1394 if (x == NULL) 1395 goto out_noput; 1396 1397 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 1398 if (IS_ERR(resp_skb)) { 1399 err = PTR_ERR(resp_skb); 1400 } else { 1401 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); 1402 } 1403 xfrm_state_put(x); 1404 out_noput: 1405 return err; 1406 } 1407 1408 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, 1409 struct nlattr **attrs) 1410 { 1411 struct net *net = sock_net(skb->sk); 1412 struct xfrm_state *x; 1413 struct xfrm_userspi_info *p; 1414 struct xfrm_translator *xtr; 1415 struct sk_buff *resp_skb; 1416 xfrm_address_t *daddr; 1417 int family; 1418 int err; 1419 u32 mark; 1420 struct xfrm_mark m; 1421 u32 if_id = 0; 1422 1423 p = nlmsg_data(nlh); 1424 err = verify_spi_info(p->info.id.proto, p->min, p->max); 1425 if (err) 1426 goto out_noput; 1427 1428 family = p->info.family; 1429 daddr = &p->info.id.daddr; 1430 1431 x = NULL; 1432 1433 mark = xfrm_mark_get(attrs, &m); 1434 1435 if (attrs[XFRMA_IF_ID]) { 1436 if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 1437 if (!if_id) { 1438 err = -EINVAL; 1439 goto out_noput; 1440 } 1441 } 1442 1443 if (p->info.seq) { 1444 x = xfrm_find_acq_byseq(net, mark, p->info.seq); 1445 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) { 1446 xfrm_state_put(x); 1447 x = NULL; 1448 } 1449 } 1450 1451 if (!x) 1452 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid, 1453 if_id, p->info.id.proto, daddr, 1454 &p->info.saddr, 1, 1455 family); 1456 err = -ENOENT; 1457 if (x == NULL) 1458 goto out_noput; 1459 1460 err = xfrm_alloc_spi(x, p->min, p->max); 1461 if (err) 1462 goto out; 1463 1464 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 1465 if (IS_ERR(resp_skb)) { 1466 err = PTR_ERR(resp_skb); 1467 goto out; 1468 } 1469 1470 xtr = xfrm_get_translator(); 1471 if (xtr) { 1472 err = xtr->alloc_compat(skb, nlmsg_hdr(skb)); 1473 1474 xfrm_put_translator(xtr); 1475 if (err) { 1476 kfree_skb(resp_skb); 1477 goto out; 1478 } 1479 } 1480 1481 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); 1482 1483 out: 1484 xfrm_state_put(x); 1485 out_noput: 1486 return err; 1487 } 1488 1489 static int verify_policy_dir(u8 dir) 1490 { 1491 switch (dir) { 1492 case XFRM_POLICY_IN: 1493 case XFRM_POLICY_OUT: 1494 case XFRM_POLICY_FWD: 1495 break; 1496 1497 default: 1498 return -EINVAL; 1499 } 1500 1501 return 0; 1502 } 1503 1504 static int verify_policy_type(u8 type) 1505 { 1506 switch (type) { 1507 case XFRM_POLICY_TYPE_MAIN: 1508 #ifdef CONFIG_XFRM_SUB_POLICY 1509 case XFRM_POLICY_TYPE_SUB: 1510 #endif 1511 break; 1512 1513 default: 1514 return -EINVAL; 1515 } 1516 1517 return 0; 1518 } 1519 1520 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p) 1521 { 1522 int ret; 1523 1524 switch (p->share) { 1525 case XFRM_SHARE_ANY: 1526 case XFRM_SHARE_SESSION: 1527 case XFRM_SHARE_USER: 1528 case XFRM_SHARE_UNIQUE: 1529 break; 1530 1531 default: 1532 return -EINVAL; 1533 } 1534 1535 switch (p->action) { 1536 case XFRM_POLICY_ALLOW: 1537 case XFRM_POLICY_BLOCK: 1538 break; 1539 1540 default: 1541 return -EINVAL; 1542 } 1543 1544 switch (p->sel.family) { 1545 case AF_INET: 1546 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32) 1547 return -EINVAL; 1548 1549 break; 1550 1551 case AF_INET6: 1552 #if IS_ENABLED(CONFIG_IPV6) 1553 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128) 1554 return -EINVAL; 1555 1556 break; 1557 #else 1558 return -EAFNOSUPPORT; 1559 #endif 1560 1561 default: 1562 return -EINVAL; 1563 } 1564 1565 ret = verify_policy_dir(p->dir); 1566 if (ret) 1567 return ret; 1568 if (p->index && (xfrm_policy_id2dir(p->index) != p->dir)) 1569 return -EINVAL; 1570 1571 return 0; 1572 } 1573 1574 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs) 1575 { 1576 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1577 struct xfrm_user_sec_ctx *uctx; 1578 1579 if (!rt) 1580 return 0; 1581 1582 uctx = nla_data(rt); 1583 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL); 1584 } 1585 1586 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut, 1587 int nr) 1588 { 1589 int i; 1590 1591 xp->xfrm_nr = nr; 1592 for (i = 0; i < nr; i++, ut++) { 1593 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 1594 1595 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id)); 1596 memcpy(&t->saddr, &ut->saddr, 1597 sizeof(xfrm_address_t)); 1598 t->reqid = ut->reqid; 1599 t->mode = ut->mode; 1600 t->share = ut->share; 1601 t->optional = ut->optional; 1602 t->aalgos = ut->aalgos; 1603 t->ealgos = ut->ealgos; 1604 t->calgos = ut->calgos; 1605 /* If all masks are ~0, then we allow all algorithms. */ 1606 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos); 1607 t->encap_family = ut->family; 1608 } 1609 } 1610 1611 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family) 1612 { 1613 u16 prev_family; 1614 int i; 1615 1616 if (nr > XFRM_MAX_DEPTH) 1617 return -EINVAL; 1618 1619 prev_family = family; 1620 1621 for (i = 0; i < nr; i++) { 1622 /* We never validated the ut->family value, so many 1623 * applications simply leave it at zero. The check was 1624 * never made and ut->family was ignored because all 1625 * templates could be assumed to have the same family as 1626 * the policy itself. Now that we will have ipv4-in-ipv6 1627 * and ipv6-in-ipv4 tunnels, this is no longer true. 1628 */ 1629 if (!ut[i].family) 1630 ut[i].family = family; 1631 1632 switch (ut[i].mode) { 1633 case XFRM_MODE_TUNNEL: 1634 case XFRM_MODE_BEET: 1635 break; 1636 default: 1637 if (ut[i].family != prev_family) 1638 return -EINVAL; 1639 break; 1640 } 1641 if (ut[i].mode >= XFRM_MODE_MAX) 1642 return -EINVAL; 1643 1644 prev_family = ut[i].family; 1645 1646 switch (ut[i].family) { 1647 case AF_INET: 1648 break; 1649 #if IS_ENABLED(CONFIG_IPV6) 1650 case AF_INET6: 1651 break; 1652 #endif 1653 default: 1654 return -EINVAL; 1655 } 1656 1657 if (!xfrm_id_proto_valid(ut[i].id.proto)) 1658 return -EINVAL; 1659 } 1660 1661 return 0; 1662 } 1663 1664 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs) 1665 { 1666 struct nlattr *rt = attrs[XFRMA_TMPL]; 1667 1668 if (!rt) { 1669 pol->xfrm_nr = 0; 1670 } else { 1671 struct xfrm_user_tmpl *utmpl = nla_data(rt); 1672 int nr = nla_len(rt) / sizeof(*utmpl); 1673 int err; 1674 1675 err = validate_tmpl(nr, utmpl, pol->family); 1676 if (err) 1677 return err; 1678 1679 copy_templates(pol, utmpl, nr); 1680 } 1681 return 0; 1682 } 1683 1684 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs) 1685 { 1686 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE]; 1687 struct xfrm_userpolicy_type *upt; 1688 u8 type = XFRM_POLICY_TYPE_MAIN; 1689 int err; 1690 1691 if (rt) { 1692 upt = nla_data(rt); 1693 type = upt->type; 1694 } 1695 1696 err = verify_policy_type(type); 1697 if (err) 1698 return err; 1699 1700 *tp = type; 1701 return 0; 1702 } 1703 1704 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p) 1705 { 1706 xp->priority = p->priority; 1707 xp->index = p->index; 1708 memcpy(&xp->selector, &p->sel, sizeof(xp->selector)); 1709 memcpy(&xp->lft, &p->lft, sizeof(xp->lft)); 1710 xp->action = p->action; 1711 xp->flags = p->flags; 1712 xp->family = p->sel.family; 1713 /* XXX xp->share = p->share; */ 1714 } 1715 1716 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir) 1717 { 1718 memset(p, 0, sizeof(*p)); 1719 memcpy(&p->sel, &xp->selector, sizeof(p->sel)); 1720 memcpy(&p->lft, &xp->lft, sizeof(p->lft)); 1721 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft)); 1722 p->priority = xp->priority; 1723 p->index = xp->index; 1724 p->sel.family = xp->family; 1725 p->dir = dir; 1726 p->action = xp->action; 1727 p->flags = xp->flags; 1728 p->share = XFRM_SHARE_ANY; /* XXX xp->share */ 1729 } 1730 1731 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp) 1732 { 1733 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL); 1734 int err; 1735 1736 if (!xp) { 1737 *errp = -ENOMEM; 1738 return NULL; 1739 } 1740 1741 copy_from_user_policy(xp, p); 1742 1743 err = copy_from_user_policy_type(&xp->type, attrs); 1744 if (err) 1745 goto error; 1746 1747 if (!(err = copy_from_user_tmpl(xp, attrs))) 1748 err = copy_from_user_sec_ctx(xp, attrs); 1749 if (err) 1750 goto error; 1751 1752 xfrm_mark_get(attrs, &xp->mark); 1753 1754 if (attrs[XFRMA_IF_ID]) { 1755 xp->if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 1756 if (!xp->if_id) { 1757 err = -EINVAL; 1758 goto error; 1759 } 1760 } 1761 1762 return xp; 1763 error: 1764 *errp = err; 1765 xp->walk.dead = 1; 1766 xfrm_policy_destroy(xp); 1767 return NULL; 1768 } 1769 1770 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1771 struct nlattr **attrs) 1772 { 1773 struct net *net = sock_net(skb->sk); 1774 struct xfrm_userpolicy_info *p = nlmsg_data(nlh); 1775 struct xfrm_policy *xp; 1776 struct km_event c; 1777 int err; 1778 int excl; 1779 1780 err = verify_newpolicy_info(p); 1781 if (err) 1782 return err; 1783 err = verify_sec_ctx_len(attrs); 1784 if (err) 1785 return err; 1786 1787 xp = xfrm_policy_construct(net, p, attrs, &err); 1788 if (!xp) 1789 return err; 1790 1791 /* shouldn't excl be based on nlh flags?? 1792 * Aha! this is anti-netlink really i.e more pfkey derived 1793 * in netlink excl is a flag and you wouldn't need 1794 * a type XFRM_MSG_UPDPOLICY - JHS */ 1795 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY; 1796 err = xfrm_policy_insert(p->dir, xp, excl); 1797 xfrm_audit_policy_add(xp, err ? 0 : 1, true); 1798 1799 if (err) { 1800 security_xfrm_policy_free(xp->security); 1801 kfree(xp); 1802 return err; 1803 } 1804 1805 c.event = nlh->nlmsg_type; 1806 c.seq = nlh->nlmsg_seq; 1807 c.portid = nlh->nlmsg_pid; 1808 km_policy_notify(xp, p->dir, &c); 1809 1810 xfrm_pol_put(xp); 1811 1812 return 0; 1813 } 1814 1815 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb) 1816 { 1817 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH]; 1818 int i; 1819 1820 if (xp->xfrm_nr == 0) 1821 return 0; 1822 1823 for (i = 0; i < xp->xfrm_nr; i++) { 1824 struct xfrm_user_tmpl *up = &vec[i]; 1825 struct xfrm_tmpl *kp = &xp->xfrm_vec[i]; 1826 1827 memset(up, 0, sizeof(*up)); 1828 memcpy(&up->id, &kp->id, sizeof(up->id)); 1829 up->family = kp->encap_family; 1830 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr)); 1831 up->reqid = kp->reqid; 1832 up->mode = kp->mode; 1833 up->share = kp->share; 1834 up->optional = kp->optional; 1835 up->aalgos = kp->aalgos; 1836 up->ealgos = kp->ealgos; 1837 up->calgos = kp->calgos; 1838 } 1839 1840 return nla_put(skb, XFRMA_TMPL, 1841 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec); 1842 } 1843 1844 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb) 1845 { 1846 if (x->security) { 1847 return copy_sec_ctx(x->security, skb); 1848 } 1849 return 0; 1850 } 1851 1852 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb) 1853 { 1854 if (xp->security) 1855 return copy_sec_ctx(xp->security, skb); 1856 return 0; 1857 } 1858 static inline unsigned int userpolicy_type_attrsize(void) 1859 { 1860 #ifdef CONFIG_XFRM_SUB_POLICY 1861 return nla_total_size(sizeof(struct xfrm_userpolicy_type)); 1862 #else 1863 return 0; 1864 #endif 1865 } 1866 1867 #ifdef CONFIG_XFRM_SUB_POLICY 1868 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1869 { 1870 struct xfrm_userpolicy_type upt; 1871 1872 /* Sadly there are two holes in struct xfrm_userpolicy_type */ 1873 memset(&upt, 0, sizeof(upt)); 1874 upt.type = type; 1875 1876 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt); 1877 } 1878 1879 #else 1880 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1881 { 1882 return 0; 1883 } 1884 #endif 1885 1886 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr) 1887 { 1888 struct xfrm_dump_info *sp = ptr; 1889 struct xfrm_userpolicy_info *p; 1890 struct sk_buff *in_skb = sp->in_skb; 1891 struct sk_buff *skb = sp->out_skb; 1892 struct xfrm_translator *xtr; 1893 struct nlmsghdr *nlh; 1894 int err; 1895 1896 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, 1897 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags); 1898 if (nlh == NULL) 1899 return -EMSGSIZE; 1900 1901 p = nlmsg_data(nlh); 1902 copy_to_user_policy(xp, p, dir); 1903 err = copy_to_user_tmpl(xp, skb); 1904 if (!err) 1905 err = copy_to_user_sec_ctx(xp, skb); 1906 if (!err) 1907 err = copy_to_user_policy_type(xp->type, skb); 1908 if (!err) 1909 err = xfrm_mark_put(skb, &xp->mark); 1910 if (!err) 1911 err = xfrm_if_id_put(skb, xp->if_id); 1912 if (err) { 1913 nlmsg_cancel(skb, nlh); 1914 return err; 1915 } 1916 nlmsg_end(skb, nlh); 1917 1918 xtr = xfrm_get_translator(); 1919 if (xtr) { 1920 err = xtr->alloc_compat(skb, nlh); 1921 1922 xfrm_put_translator(xtr); 1923 if (err) { 1924 nlmsg_cancel(skb, nlh); 1925 return err; 1926 } 1927 } 1928 1929 return 0; 1930 } 1931 1932 static int xfrm_dump_policy_done(struct netlink_callback *cb) 1933 { 1934 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args; 1935 struct net *net = sock_net(cb->skb->sk); 1936 1937 xfrm_policy_walk_done(walk, net); 1938 return 0; 1939 } 1940 1941 static int xfrm_dump_policy_start(struct netlink_callback *cb) 1942 { 1943 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args; 1944 1945 BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args)); 1946 1947 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY); 1948 return 0; 1949 } 1950 1951 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb) 1952 { 1953 struct net *net = sock_net(skb->sk); 1954 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args; 1955 struct xfrm_dump_info info; 1956 1957 info.in_skb = cb->skb; 1958 info.out_skb = skb; 1959 info.nlmsg_seq = cb->nlh->nlmsg_seq; 1960 info.nlmsg_flags = NLM_F_MULTI; 1961 1962 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info); 1963 1964 return skb->len; 1965 } 1966 1967 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb, 1968 struct xfrm_policy *xp, 1969 int dir, u32 seq) 1970 { 1971 struct xfrm_dump_info info; 1972 struct sk_buff *skb; 1973 int err; 1974 1975 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1976 if (!skb) 1977 return ERR_PTR(-ENOMEM); 1978 1979 info.in_skb = in_skb; 1980 info.out_skb = skb; 1981 info.nlmsg_seq = seq; 1982 info.nlmsg_flags = 0; 1983 1984 err = dump_one_policy(xp, dir, 0, &info); 1985 if (err) { 1986 kfree_skb(skb); 1987 return ERR_PTR(err); 1988 } 1989 1990 return skb; 1991 } 1992 1993 static int xfrm_notify_userpolicy(struct net *net) 1994 { 1995 struct xfrm_userpolicy_default *up; 1996 int len = NLMSG_ALIGN(sizeof(*up)); 1997 struct nlmsghdr *nlh; 1998 struct sk_buff *skb; 1999 int err; 2000 2001 skb = nlmsg_new(len, GFP_ATOMIC); 2002 if (skb == NULL) 2003 return -ENOMEM; 2004 2005 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_GETDEFAULT, sizeof(*up), 0); 2006 if (nlh == NULL) { 2007 kfree_skb(skb); 2008 return -EMSGSIZE; 2009 } 2010 2011 up = nlmsg_data(nlh); 2012 up->in = net->xfrm.policy_default & XFRM_POL_DEFAULT_IN ? 2013 XFRM_USERPOLICY_BLOCK : XFRM_USERPOLICY_ACCEPT; 2014 up->fwd = net->xfrm.policy_default & XFRM_POL_DEFAULT_FWD ? 2015 XFRM_USERPOLICY_BLOCK : XFRM_USERPOLICY_ACCEPT; 2016 up->out = net->xfrm.policy_default & XFRM_POL_DEFAULT_OUT ? 2017 XFRM_USERPOLICY_BLOCK : XFRM_USERPOLICY_ACCEPT; 2018 2019 nlmsg_end(skb, nlh); 2020 2021 rcu_read_lock(); 2022 err = xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 2023 rcu_read_unlock(); 2024 2025 return err; 2026 } 2027 2028 static int xfrm_set_default(struct sk_buff *skb, struct nlmsghdr *nlh, 2029 struct nlattr **attrs) 2030 { 2031 struct net *net = sock_net(skb->sk); 2032 struct xfrm_userpolicy_default *up = nlmsg_data(nlh); 2033 2034 if (up->in == XFRM_USERPOLICY_BLOCK) 2035 net->xfrm.policy_default |= XFRM_POL_DEFAULT_IN; 2036 else if (up->in == XFRM_USERPOLICY_ACCEPT) 2037 net->xfrm.policy_default &= ~XFRM_POL_DEFAULT_IN; 2038 2039 if (up->fwd == XFRM_USERPOLICY_BLOCK) 2040 net->xfrm.policy_default |= XFRM_POL_DEFAULT_FWD; 2041 else if (up->fwd == XFRM_USERPOLICY_ACCEPT) 2042 net->xfrm.policy_default &= ~XFRM_POL_DEFAULT_FWD; 2043 2044 if (up->out == XFRM_USERPOLICY_BLOCK) 2045 net->xfrm.policy_default |= XFRM_POL_DEFAULT_OUT; 2046 else if (up->out == XFRM_USERPOLICY_ACCEPT) 2047 net->xfrm.policy_default &= ~XFRM_POL_DEFAULT_OUT; 2048 2049 rt_genid_bump_all(net); 2050 2051 xfrm_notify_userpolicy(net); 2052 return 0; 2053 } 2054 2055 static int xfrm_get_default(struct sk_buff *skb, struct nlmsghdr *nlh, 2056 struct nlattr **attrs) 2057 { 2058 struct sk_buff *r_skb; 2059 struct nlmsghdr *r_nlh; 2060 struct net *net = sock_net(skb->sk); 2061 struct xfrm_userpolicy_default *r_up; 2062 int len = NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_default)); 2063 u32 portid = NETLINK_CB(skb).portid; 2064 u32 seq = nlh->nlmsg_seq; 2065 2066 r_skb = nlmsg_new(len, GFP_ATOMIC); 2067 if (!r_skb) 2068 return -ENOMEM; 2069 2070 r_nlh = nlmsg_put(r_skb, portid, seq, XFRM_MSG_GETDEFAULT, sizeof(*r_up), 0); 2071 if (!r_nlh) { 2072 kfree_skb(r_skb); 2073 return -EMSGSIZE; 2074 } 2075 2076 r_up = nlmsg_data(r_nlh); 2077 2078 r_up->in = net->xfrm.policy_default & XFRM_POL_DEFAULT_IN ? 2079 XFRM_USERPOLICY_BLOCK : XFRM_USERPOLICY_ACCEPT; 2080 r_up->fwd = net->xfrm.policy_default & XFRM_POL_DEFAULT_FWD ? 2081 XFRM_USERPOLICY_BLOCK : XFRM_USERPOLICY_ACCEPT; 2082 r_up->out = net->xfrm.policy_default & XFRM_POL_DEFAULT_OUT ? 2083 XFRM_USERPOLICY_BLOCK : XFRM_USERPOLICY_ACCEPT; 2084 nlmsg_end(r_skb, r_nlh); 2085 2086 return nlmsg_unicast(net->xfrm.nlsk, r_skb, portid); 2087 } 2088 2089 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 2090 struct nlattr **attrs) 2091 { 2092 struct net *net = sock_net(skb->sk); 2093 struct xfrm_policy *xp; 2094 struct xfrm_userpolicy_id *p; 2095 u8 type = XFRM_POLICY_TYPE_MAIN; 2096 int err; 2097 struct km_event c; 2098 int delete; 2099 struct xfrm_mark m; 2100 u32 if_id = 0; 2101 2102 p = nlmsg_data(nlh); 2103 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY; 2104 2105 err = copy_from_user_policy_type(&type, attrs); 2106 if (err) 2107 return err; 2108 2109 err = verify_policy_dir(p->dir); 2110 if (err) 2111 return err; 2112 2113 if (attrs[XFRMA_IF_ID]) 2114 if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 2115 2116 xfrm_mark_get(attrs, &m); 2117 2118 if (p->index) 2119 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir, 2120 p->index, delete, &err); 2121 else { 2122 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 2123 struct xfrm_sec_ctx *ctx; 2124 2125 err = verify_sec_ctx_len(attrs); 2126 if (err) 2127 return err; 2128 2129 ctx = NULL; 2130 if (rt) { 2131 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 2132 2133 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); 2134 if (err) 2135 return err; 2136 } 2137 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir, 2138 &p->sel, ctx, delete, &err); 2139 security_xfrm_policy_free(ctx); 2140 } 2141 if (xp == NULL) 2142 return -ENOENT; 2143 2144 if (!delete) { 2145 struct sk_buff *resp_skb; 2146 2147 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq); 2148 if (IS_ERR(resp_skb)) { 2149 err = PTR_ERR(resp_skb); 2150 } else { 2151 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, 2152 NETLINK_CB(skb).portid); 2153 } 2154 } else { 2155 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 2156 2157 if (err != 0) 2158 goto out; 2159 2160 c.data.byid = p->index; 2161 c.event = nlh->nlmsg_type; 2162 c.seq = nlh->nlmsg_seq; 2163 c.portid = nlh->nlmsg_pid; 2164 km_policy_notify(xp, p->dir, &c); 2165 } 2166 2167 out: 2168 xfrm_pol_put(xp); 2169 return err; 2170 } 2171 2172 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 2173 struct nlattr **attrs) 2174 { 2175 struct net *net = sock_net(skb->sk); 2176 struct km_event c; 2177 struct xfrm_usersa_flush *p = nlmsg_data(nlh); 2178 int err; 2179 2180 err = xfrm_state_flush(net, p->proto, true, false); 2181 if (err) { 2182 if (err == -ESRCH) /* empty table */ 2183 return 0; 2184 return err; 2185 } 2186 c.data.proto = p->proto; 2187 c.event = nlh->nlmsg_type; 2188 c.seq = nlh->nlmsg_seq; 2189 c.portid = nlh->nlmsg_pid; 2190 c.net = net; 2191 km_state_notify(NULL, &c); 2192 2193 return 0; 2194 } 2195 2196 static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x) 2197 { 2198 unsigned int replay_size = x->replay_esn ? 2199 xfrm_replay_state_esn_len(x->replay_esn) : 2200 sizeof(struct xfrm_replay_state); 2201 2202 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id)) 2203 + nla_total_size(replay_size) 2204 + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur)) 2205 + nla_total_size(sizeof(struct xfrm_mark)) 2206 + nla_total_size(4) /* XFRM_AE_RTHR */ 2207 + nla_total_size(4); /* XFRM_AE_ETHR */ 2208 } 2209 2210 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 2211 { 2212 struct xfrm_aevent_id *id; 2213 struct nlmsghdr *nlh; 2214 int err; 2215 2216 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0); 2217 if (nlh == NULL) 2218 return -EMSGSIZE; 2219 2220 id = nlmsg_data(nlh); 2221 memset(&id->sa_id, 0, sizeof(id->sa_id)); 2222 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr)); 2223 id->sa_id.spi = x->id.spi; 2224 id->sa_id.family = x->props.family; 2225 id->sa_id.proto = x->id.proto; 2226 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr)); 2227 id->reqid = x->props.reqid; 2228 id->flags = c->data.aevent; 2229 2230 if (x->replay_esn) { 2231 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL, 2232 xfrm_replay_state_esn_len(x->replay_esn), 2233 x->replay_esn); 2234 } else { 2235 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), 2236 &x->replay); 2237 } 2238 if (err) 2239 goto out_cancel; 2240 err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft, 2241 XFRMA_PAD); 2242 if (err) 2243 goto out_cancel; 2244 2245 if (id->flags & XFRM_AE_RTHR) { 2246 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff); 2247 if (err) 2248 goto out_cancel; 2249 } 2250 if (id->flags & XFRM_AE_ETHR) { 2251 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH, 2252 x->replay_maxage * 10 / HZ); 2253 if (err) 2254 goto out_cancel; 2255 } 2256 err = xfrm_mark_put(skb, &x->mark); 2257 if (err) 2258 goto out_cancel; 2259 2260 err = xfrm_if_id_put(skb, x->if_id); 2261 if (err) 2262 goto out_cancel; 2263 2264 nlmsg_end(skb, nlh); 2265 return 0; 2266 2267 out_cancel: 2268 nlmsg_cancel(skb, nlh); 2269 return err; 2270 } 2271 2272 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 2273 struct nlattr **attrs) 2274 { 2275 struct net *net = sock_net(skb->sk); 2276 struct xfrm_state *x; 2277 struct sk_buff *r_skb; 2278 int err; 2279 struct km_event c; 2280 u32 mark; 2281 struct xfrm_mark m; 2282 struct xfrm_aevent_id *p = nlmsg_data(nlh); 2283 struct xfrm_usersa_id *id = &p->sa_id; 2284 2285 mark = xfrm_mark_get(attrs, &m); 2286 2287 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family); 2288 if (x == NULL) 2289 return -ESRCH; 2290 2291 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 2292 if (r_skb == NULL) { 2293 xfrm_state_put(x); 2294 return -ENOMEM; 2295 } 2296 2297 /* 2298 * XXX: is this lock really needed - none of the other 2299 * gets lock (the concern is things getting updated 2300 * while we are still reading) - jhs 2301 */ 2302 spin_lock_bh(&x->lock); 2303 c.data.aevent = p->flags; 2304 c.seq = nlh->nlmsg_seq; 2305 c.portid = nlh->nlmsg_pid; 2306 2307 err = build_aevent(r_skb, x, &c); 2308 BUG_ON(err < 0); 2309 2310 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid); 2311 spin_unlock_bh(&x->lock); 2312 xfrm_state_put(x); 2313 return err; 2314 } 2315 2316 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 2317 struct nlattr **attrs) 2318 { 2319 struct net *net = sock_net(skb->sk); 2320 struct xfrm_state *x; 2321 struct km_event c; 2322 int err = -EINVAL; 2323 u32 mark = 0; 2324 struct xfrm_mark m; 2325 struct xfrm_aevent_id *p = nlmsg_data(nlh); 2326 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 2327 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL]; 2328 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 2329 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; 2330 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; 2331 2332 if (!lt && !rp && !re && !et && !rt) 2333 return err; 2334 2335 /* pedantic mode - thou shalt sayeth replaceth */ 2336 if (!(nlh->nlmsg_flags&NLM_F_REPLACE)) 2337 return err; 2338 2339 mark = xfrm_mark_get(attrs, &m); 2340 2341 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family); 2342 if (x == NULL) 2343 return -ESRCH; 2344 2345 if (x->km.state != XFRM_STATE_VALID) 2346 goto out; 2347 2348 err = xfrm_replay_verify_len(x->replay_esn, re); 2349 if (err) 2350 goto out; 2351 2352 spin_lock_bh(&x->lock); 2353 xfrm_update_ae_params(x, attrs, 1); 2354 spin_unlock_bh(&x->lock); 2355 2356 c.event = nlh->nlmsg_type; 2357 c.seq = nlh->nlmsg_seq; 2358 c.portid = nlh->nlmsg_pid; 2359 c.data.aevent = XFRM_AE_CU; 2360 km_state_notify(x, &c); 2361 err = 0; 2362 out: 2363 xfrm_state_put(x); 2364 return err; 2365 } 2366 2367 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 2368 struct nlattr **attrs) 2369 { 2370 struct net *net = sock_net(skb->sk); 2371 struct km_event c; 2372 u8 type = XFRM_POLICY_TYPE_MAIN; 2373 int err; 2374 2375 err = copy_from_user_policy_type(&type, attrs); 2376 if (err) 2377 return err; 2378 2379 err = xfrm_policy_flush(net, type, true); 2380 if (err) { 2381 if (err == -ESRCH) /* empty table */ 2382 return 0; 2383 return err; 2384 } 2385 2386 c.data.type = type; 2387 c.event = nlh->nlmsg_type; 2388 c.seq = nlh->nlmsg_seq; 2389 c.portid = nlh->nlmsg_pid; 2390 c.net = net; 2391 km_policy_notify(NULL, 0, &c); 2392 return 0; 2393 } 2394 2395 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 2396 struct nlattr **attrs) 2397 { 2398 struct net *net = sock_net(skb->sk); 2399 struct xfrm_policy *xp; 2400 struct xfrm_user_polexpire *up = nlmsg_data(nlh); 2401 struct xfrm_userpolicy_info *p = &up->pol; 2402 u8 type = XFRM_POLICY_TYPE_MAIN; 2403 int err = -ENOENT; 2404 struct xfrm_mark m; 2405 u32 if_id = 0; 2406 2407 err = copy_from_user_policy_type(&type, attrs); 2408 if (err) 2409 return err; 2410 2411 err = verify_policy_dir(p->dir); 2412 if (err) 2413 return err; 2414 2415 if (attrs[XFRMA_IF_ID]) 2416 if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 2417 2418 xfrm_mark_get(attrs, &m); 2419 2420 if (p->index) 2421 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir, p->index, 2422 0, &err); 2423 else { 2424 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 2425 struct xfrm_sec_ctx *ctx; 2426 2427 err = verify_sec_ctx_len(attrs); 2428 if (err) 2429 return err; 2430 2431 ctx = NULL; 2432 if (rt) { 2433 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 2434 2435 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); 2436 if (err) 2437 return err; 2438 } 2439 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir, 2440 &p->sel, ctx, 0, &err); 2441 security_xfrm_policy_free(ctx); 2442 } 2443 if (xp == NULL) 2444 return -ENOENT; 2445 2446 if (unlikely(xp->walk.dead)) 2447 goto out; 2448 2449 err = 0; 2450 if (up->hard) { 2451 xfrm_policy_delete(xp, p->dir); 2452 xfrm_audit_policy_delete(xp, 1, true); 2453 } 2454 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid); 2455 2456 out: 2457 xfrm_pol_put(xp); 2458 return err; 2459 } 2460 2461 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 2462 struct nlattr **attrs) 2463 { 2464 struct net *net = sock_net(skb->sk); 2465 struct xfrm_state *x; 2466 int err; 2467 struct xfrm_user_expire *ue = nlmsg_data(nlh); 2468 struct xfrm_usersa_info *p = &ue->state; 2469 struct xfrm_mark m; 2470 u32 mark = xfrm_mark_get(attrs, &m); 2471 2472 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family); 2473 2474 err = -ENOENT; 2475 if (x == NULL) 2476 return err; 2477 2478 spin_lock_bh(&x->lock); 2479 err = -EINVAL; 2480 if (x->km.state != XFRM_STATE_VALID) 2481 goto out; 2482 km_state_expired(x, ue->hard, nlh->nlmsg_pid); 2483 2484 if (ue->hard) { 2485 __xfrm_state_delete(x); 2486 xfrm_audit_state_delete(x, 1, true); 2487 } 2488 err = 0; 2489 out: 2490 spin_unlock_bh(&x->lock); 2491 xfrm_state_put(x); 2492 return err; 2493 } 2494 2495 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, 2496 struct nlattr **attrs) 2497 { 2498 struct net *net = sock_net(skb->sk); 2499 struct xfrm_policy *xp; 2500 struct xfrm_user_tmpl *ut; 2501 int i; 2502 struct nlattr *rt = attrs[XFRMA_TMPL]; 2503 struct xfrm_mark mark; 2504 2505 struct xfrm_user_acquire *ua = nlmsg_data(nlh); 2506 struct xfrm_state *x = xfrm_state_alloc(net); 2507 int err = -ENOMEM; 2508 2509 if (!x) 2510 goto nomem; 2511 2512 xfrm_mark_get(attrs, &mark); 2513 2514 err = verify_newpolicy_info(&ua->policy); 2515 if (err) 2516 goto free_state; 2517 err = verify_sec_ctx_len(attrs); 2518 if (err) 2519 goto free_state; 2520 2521 /* build an XP */ 2522 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err); 2523 if (!xp) 2524 goto free_state; 2525 2526 memcpy(&x->id, &ua->id, sizeof(ua->id)); 2527 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr)); 2528 memcpy(&x->sel, &ua->sel, sizeof(ua->sel)); 2529 xp->mark.m = x->mark.m = mark.m; 2530 xp->mark.v = x->mark.v = mark.v; 2531 ut = nla_data(rt); 2532 /* extract the templates and for each call km_key */ 2533 for (i = 0; i < xp->xfrm_nr; i++, ut++) { 2534 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 2535 memcpy(&x->id, &t->id, sizeof(x->id)); 2536 x->props.mode = t->mode; 2537 x->props.reqid = t->reqid; 2538 x->props.family = ut->family; 2539 t->aalgos = ua->aalgos; 2540 t->ealgos = ua->ealgos; 2541 t->calgos = ua->calgos; 2542 err = km_query(x, t, xp); 2543 2544 } 2545 2546 xfrm_state_free(x); 2547 kfree(xp); 2548 2549 return 0; 2550 2551 free_state: 2552 xfrm_state_free(x); 2553 nomem: 2554 return err; 2555 } 2556 2557 #ifdef CONFIG_XFRM_MIGRATE 2558 static int copy_from_user_migrate(struct xfrm_migrate *ma, 2559 struct xfrm_kmaddress *k, 2560 struct nlattr **attrs, int *num) 2561 { 2562 struct nlattr *rt = attrs[XFRMA_MIGRATE]; 2563 struct xfrm_user_migrate *um; 2564 int i, num_migrate; 2565 2566 if (k != NULL) { 2567 struct xfrm_user_kmaddress *uk; 2568 2569 uk = nla_data(attrs[XFRMA_KMADDRESS]); 2570 memcpy(&k->local, &uk->local, sizeof(k->local)); 2571 memcpy(&k->remote, &uk->remote, sizeof(k->remote)); 2572 k->family = uk->family; 2573 k->reserved = uk->reserved; 2574 } 2575 2576 um = nla_data(rt); 2577 num_migrate = nla_len(rt) / sizeof(*um); 2578 2579 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH) 2580 return -EINVAL; 2581 2582 for (i = 0; i < num_migrate; i++, um++, ma++) { 2583 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr)); 2584 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr)); 2585 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr)); 2586 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr)); 2587 2588 ma->proto = um->proto; 2589 ma->mode = um->mode; 2590 ma->reqid = um->reqid; 2591 2592 ma->old_family = um->old_family; 2593 ma->new_family = um->new_family; 2594 } 2595 2596 *num = i; 2597 return 0; 2598 } 2599 2600 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 2601 struct nlattr **attrs) 2602 { 2603 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh); 2604 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 2605 struct xfrm_kmaddress km, *kmp; 2606 u8 type; 2607 int err; 2608 int n = 0; 2609 struct net *net = sock_net(skb->sk); 2610 struct xfrm_encap_tmpl *encap = NULL; 2611 2612 if (attrs[XFRMA_MIGRATE] == NULL) 2613 return -EINVAL; 2614 2615 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL; 2616 2617 err = copy_from_user_policy_type(&type, attrs); 2618 if (err) 2619 return err; 2620 2621 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n); 2622 if (err) 2623 return err; 2624 2625 if (!n) 2626 return 0; 2627 2628 if (attrs[XFRMA_ENCAP]) { 2629 encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]), 2630 sizeof(*encap), GFP_KERNEL); 2631 if (!encap) 2632 return -ENOMEM; 2633 } 2634 2635 err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap); 2636 2637 kfree(encap); 2638 2639 return err; 2640 } 2641 #else 2642 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 2643 struct nlattr **attrs) 2644 { 2645 return -ENOPROTOOPT; 2646 } 2647 #endif 2648 2649 #ifdef CONFIG_XFRM_MIGRATE 2650 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb) 2651 { 2652 struct xfrm_user_migrate um; 2653 2654 memset(&um, 0, sizeof(um)); 2655 um.proto = m->proto; 2656 um.mode = m->mode; 2657 um.reqid = m->reqid; 2658 um.old_family = m->old_family; 2659 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr)); 2660 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr)); 2661 um.new_family = m->new_family; 2662 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr)); 2663 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr)); 2664 2665 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um); 2666 } 2667 2668 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb) 2669 { 2670 struct xfrm_user_kmaddress uk; 2671 2672 memset(&uk, 0, sizeof(uk)); 2673 uk.family = k->family; 2674 uk.reserved = k->reserved; 2675 memcpy(&uk.local, &k->local, sizeof(uk.local)); 2676 memcpy(&uk.remote, &k->remote, sizeof(uk.remote)); 2677 2678 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk); 2679 } 2680 2681 static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma, 2682 int with_encp) 2683 { 2684 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id)) 2685 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0) 2686 + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0) 2687 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate) 2688 + userpolicy_type_attrsize(); 2689 } 2690 2691 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m, 2692 int num_migrate, const struct xfrm_kmaddress *k, 2693 const struct xfrm_selector *sel, 2694 const struct xfrm_encap_tmpl *encap, u8 dir, u8 type) 2695 { 2696 const struct xfrm_migrate *mp; 2697 struct xfrm_userpolicy_id *pol_id; 2698 struct nlmsghdr *nlh; 2699 int i, err; 2700 2701 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0); 2702 if (nlh == NULL) 2703 return -EMSGSIZE; 2704 2705 pol_id = nlmsg_data(nlh); 2706 /* copy data from selector, dir, and type to the pol_id */ 2707 memset(pol_id, 0, sizeof(*pol_id)); 2708 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel)); 2709 pol_id->dir = dir; 2710 2711 if (k != NULL) { 2712 err = copy_to_user_kmaddress(k, skb); 2713 if (err) 2714 goto out_cancel; 2715 } 2716 if (encap) { 2717 err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap); 2718 if (err) 2719 goto out_cancel; 2720 } 2721 err = copy_to_user_policy_type(type, skb); 2722 if (err) 2723 goto out_cancel; 2724 for (i = 0, mp = m ; i < num_migrate; i++, mp++) { 2725 err = copy_to_user_migrate(mp, skb); 2726 if (err) 2727 goto out_cancel; 2728 } 2729 2730 nlmsg_end(skb, nlh); 2731 return 0; 2732 2733 out_cancel: 2734 nlmsg_cancel(skb, nlh); 2735 return err; 2736 } 2737 2738 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2739 const struct xfrm_migrate *m, int num_migrate, 2740 const struct xfrm_kmaddress *k, 2741 const struct xfrm_encap_tmpl *encap) 2742 { 2743 struct net *net = &init_net; 2744 struct sk_buff *skb; 2745 int err; 2746 2747 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap), 2748 GFP_ATOMIC); 2749 if (skb == NULL) 2750 return -ENOMEM; 2751 2752 /* build migrate */ 2753 err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type); 2754 BUG_ON(err < 0); 2755 2756 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE); 2757 } 2758 #else 2759 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2760 const struct xfrm_migrate *m, int num_migrate, 2761 const struct xfrm_kmaddress *k, 2762 const struct xfrm_encap_tmpl *encap) 2763 { 2764 return -ENOPROTOOPT; 2765 } 2766 #endif 2767 2768 #define XMSGSIZE(type) sizeof(struct type) 2769 2770 const int xfrm_msg_min[XFRM_NR_MSGTYPES] = { 2771 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2772 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2773 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2774 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2775 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2776 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2777 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info), 2778 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire), 2779 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire), 2780 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2781 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2782 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire), 2783 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush), 2784 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0, 2785 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2786 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2787 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report), 2788 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2789 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32), 2790 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 2791 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 2792 [XFRM_MSG_SETDEFAULT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default), 2793 [XFRM_MSG_GETDEFAULT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default), 2794 }; 2795 EXPORT_SYMBOL_GPL(xfrm_msg_min); 2796 2797 #undef XMSGSIZE 2798 2799 const struct nla_policy xfrma_policy[XFRMA_MAX+1] = { 2800 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)}, 2801 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)}, 2802 [XFRMA_LASTUSED] = { .type = NLA_U64}, 2803 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)}, 2804 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) }, 2805 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) }, 2806 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) }, 2807 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) }, 2808 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) }, 2809 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) }, 2810 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) }, 2811 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) }, 2812 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) }, 2813 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 }, 2814 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 }, 2815 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) }, 2816 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) }, 2817 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)}, 2818 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) }, 2819 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) }, 2820 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) }, 2821 [XFRMA_TFCPAD] = { .type = NLA_U32 }, 2822 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) }, 2823 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 }, 2824 [XFRMA_PROTO] = { .type = NLA_U8 }, 2825 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) }, 2826 [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) }, 2827 [XFRMA_SET_MARK] = { .type = NLA_U32 }, 2828 [XFRMA_SET_MARK_MASK] = { .type = NLA_U32 }, 2829 [XFRMA_IF_ID] = { .type = NLA_U32 }, 2830 }; 2831 EXPORT_SYMBOL_GPL(xfrma_policy); 2832 2833 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = { 2834 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) }, 2835 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) }, 2836 }; 2837 2838 static const struct xfrm_link { 2839 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **); 2840 int (*start)(struct netlink_callback *); 2841 int (*dump)(struct sk_buff *, struct netlink_callback *); 2842 int (*done)(struct netlink_callback *); 2843 const struct nla_policy *nla_pol; 2844 int nla_max; 2845 } xfrm_dispatch[XFRM_NR_MSGTYPES] = { 2846 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 2847 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa }, 2848 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa, 2849 .dump = xfrm_dump_sa, 2850 .done = xfrm_dump_sa_done }, 2851 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 2852 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy }, 2853 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy, 2854 .start = xfrm_dump_policy_start, 2855 .dump = xfrm_dump_policy, 2856 .done = xfrm_dump_policy_done }, 2857 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi }, 2858 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire }, 2859 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire }, 2860 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 2861 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 2862 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire}, 2863 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa }, 2864 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy }, 2865 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae }, 2866 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae }, 2867 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate }, 2868 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo }, 2869 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo, 2870 .nla_pol = xfrma_spd_policy, 2871 .nla_max = XFRMA_SPD_MAX }, 2872 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo }, 2873 [XFRM_MSG_SETDEFAULT - XFRM_MSG_BASE] = { .doit = xfrm_set_default }, 2874 [XFRM_MSG_GETDEFAULT - XFRM_MSG_BASE] = { .doit = xfrm_get_default }, 2875 }; 2876 2877 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, 2878 struct netlink_ext_ack *extack) 2879 { 2880 struct net *net = sock_net(skb->sk); 2881 struct nlattr *attrs[XFRMA_MAX+1]; 2882 const struct xfrm_link *link; 2883 struct nlmsghdr *nlh64 = NULL; 2884 int type, err; 2885 2886 type = nlh->nlmsg_type; 2887 if (type > XFRM_MSG_MAX) 2888 return -EINVAL; 2889 2890 type -= XFRM_MSG_BASE; 2891 link = &xfrm_dispatch[type]; 2892 2893 /* All operations require privileges, even GET */ 2894 if (!netlink_net_capable(skb, CAP_NET_ADMIN)) 2895 return -EPERM; 2896 2897 if (in_compat_syscall()) { 2898 struct xfrm_translator *xtr = xfrm_get_translator(); 2899 2900 if (!xtr) 2901 return -EOPNOTSUPP; 2902 2903 nlh64 = xtr->rcv_msg_compat(nlh, link->nla_max, 2904 link->nla_pol, extack); 2905 xfrm_put_translator(xtr); 2906 if (IS_ERR(nlh64)) 2907 return PTR_ERR(nlh64); 2908 if (nlh64) 2909 nlh = nlh64; 2910 } 2911 2912 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) || 2913 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) && 2914 (nlh->nlmsg_flags & NLM_F_DUMP)) { 2915 struct netlink_dump_control c = { 2916 .start = link->start, 2917 .dump = link->dump, 2918 .done = link->done, 2919 }; 2920 2921 if (link->dump == NULL) { 2922 err = -EINVAL; 2923 goto err; 2924 } 2925 2926 err = netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c); 2927 goto err; 2928 } 2929 2930 err = nlmsg_parse_deprecated(nlh, xfrm_msg_min[type], attrs, 2931 link->nla_max ? : XFRMA_MAX, 2932 link->nla_pol ? : xfrma_policy, extack); 2933 if (err < 0) 2934 goto err; 2935 2936 if (link->doit == NULL) { 2937 err = -EINVAL; 2938 goto err; 2939 } 2940 2941 err = link->doit(skb, nlh, attrs); 2942 2943 /* We need to free skb allocated in xfrm_alloc_compat() before 2944 * returning from this function, because consume_skb() won't take 2945 * care of frag_list since netlink destructor sets 2946 * sbk->head to NULL. (see netlink_skb_destructor()) 2947 */ 2948 if (skb_has_frag_list(skb)) { 2949 kfree_skb(skb_shinfo(skb)->frag_list); 2950 skb_shinfo(skb)->frag_list = NULL; 2951 } 2952 2953 err: 2954 kvfree(nlh64); 2955 return err; 2956 } 2957 2958 static void xfrm_netlink_rcv(struct sk_buff *skb) 2959 { 2960 struct net *net = sock_net(skb->sk); 2961 2962 mutex_lock(&net->xfrm.xfrm_cfg_mutex); 2963 netlink_rcv_skb(skb, &xfrm_user_rcv_msg); 2964 mutex_unlock(&net->xfrm.xfrm_cfg_mutex); 2965 } 2966 2967 static inline unsigned int xfrm_expire_msgsize(void) 2968 { 2969 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire)) 2970 + nla_total_size(sizeof(struct xfrm_mark)); 2971 } 2972 2973 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 2974 { 2975 struct xfrm_user_expire *ue; 2976 struct nlmsghdr *nlh; 2977 int err; 2978 2979 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0); 2980 if (nlh == NULL) 2981 return -EMSGSIZE; 2982 2983 ue = nlmsg_data(nlh); 2984 copy_to_user_state(x, &ue->state); 2985 ue->hard = (c->data.hard != 0) ? 1 : 0; 2986 /* clear the padding bytes */ 2987 memset_after(ue, 0, hard); 2988 2989 err = xfrm_mark_put(skb, &x->mark); 2990 if (err) 2991 return err; 2992 2993 err = xfrm_if_id_put(skb, x->if_id); 2994 if (err) 2995 return err; 2996 2997 nlmsg_end(skb, nlh); 2998 return 0; 2999 } 3000 3001 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c) 3002 { 3003 struct net *net = xs_net(x); 3004 struct sk_buff *skb; 3005 3006 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC); 3007 if (skb == NULL) 3008 return -ENOMEM; 3009 3010 if (build_expire(skb, x, c) < 0) { 3011 kfree_skb(skb); 3012 return -EMSGSIZE; 3013 } 3014 3015 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE); 3016 } 3017 3018 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c) 3019 { 3020 struct net *net = xs_net(x); 3021 struct sk_buff *skb; 3022 int err; 3023 3024 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 3025 if (skb == NULL) 3026 return -ENOMEM; 3027 3028 err = build_aevent(skb, x, c); 3029 BUG_ON(err < 0); 3030 3031 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS); 3032 } 3033 3034 static int xfrm_notify_sa_flush(const struct km_event *c) 3035 { 3036 struct net *net = c->net; 3037 struct xfrm_usersa_flush *p; 3038 struct nlmsghdr *nlh; 3039 struct sk_buff *skb; 3040 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush)); 3041 3042 skb = nlmsg_new(len, GFP_ATOMIC); 3043 if (skb == NULL) 3044 return -ENOMEM; 3045 3046 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0); 3047 if (nlh == NULL) { 3048 kfree_skb(skb); 3049 return -EMSGSIZE; 3050 } 3051 3052 p = nlmsg_data(nlh); 3053 p->proto = c->data.proto; 3054 3055 nlmsg_end(skb, nlh); 3056 3057 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA); 3058 } 3059 3060 static inline unsigned int xfrm_sa_len(struct xfrm_state *x) 3061 { 3062 unsigned int l = 0; 3063 if (x->aead) 3064 l += nla_total_size(aead_len(x->aead)); 3065 if (x->aalg) { 3066 l += nla_total_size(sizeof(struct xfrm_algo) + 3067 (x->aalg->alg_key_len + 7) / 8); 3068 l += nla_total_size(xfrm_alg_auth_len(x->aalg)); 3069 } 3070 if (x->ealg) 3071 l += nla_total_size(xfrm_alg_len(x->ealg)); 3072 if (x->calg) 3073 l += nla_total_size(sizeof(*x->calg)); 3074 if (x->encap) 3075 l += nla_total_size(sizeof(*x->encap)); 3076 if (x->tfcpad) 3077 l += nla_total_size(sizeof(x->tfcpad)); 3078 if (x->replay_esn) 3079 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn)); 3080 else 3081 l += nla_total_size(sizeof(struct xfrm_replay_state)); 3082 if (x->security) 3083 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) + 3084 x->security->ctx_len); 3085 if (x->coaddr) 3086 l += nla_total_size(sizeof(*x->coaddr)); 3087 if (x->props.extra_flags) 3088 l += nla_total_size(sizeof(x->props.extra_flags)); 3089 if (x->xso.dev) 3090 l += nla_total_size(sizeof(struct xfrm_user_offload)); 3091 if (x->props.smark.v | x->props.smark.m) { 3092 l += nla_total_size(sizeof(x->props.smark.v)); 3093 l += nla_total_size(sizeof(x->props.smark.m)); 3094 } 3095 if (x->if_id) 3096 l += nla_total_size(sizeof(x->if_id)); 3097 3098 /* Must count x->lastused as it may become non-zero behind our back. */ 3099 l += nla_total_size_64bit(sizeof(u64)); 3100 3101 if (x->mapping_maxage) 3102 l += nla_total_size(sizeof(x->mapping_maxage)); 3103 3104 return l; 3105 } 3106 3107 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c) 3108 { 3109 struct net *net = xs_net(x); 3110 struct xfrm_usersa_info *p; 3111 struct xfrm_usersa_id *id; 3112 struct nlmsghdr *nlh; 3113 struct sk_buff *skb; 3114 unsigned int len = xfrm_sa_len(x); 3115 unsigned int headlen; 3116 int err; 3117 3118 headlen = sizeof(*p); 3119 if (c->event == XFRM_MSG_DELSA) { 3120 len += nla_total_size(headlen); 3121 headlen = sizeof(*id); 3122 len += nla_total_size(sizeof(struct xfrm_mark)); 3123 } 3124 len += NLMSG_ALIGN(headlen); 3125 3126 skb = nlmsg_new(len, GFP_ATOMIC); 3127 if (skb == NULL) 3128 return -ENOMEM; 3129 3130 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); 3131 err = -EMSGSIZE; 3132 if (nlh == NULL) 3133 goto out_free_skb; 3134 3135 p = nlmsg_data(nlh); 3136 if (c->event == XFRM_MSG_DELSA) { 3137 struct nlattr *attr; 3138 3139 id = nlmsg_data(nlh); 3140 memset(id, 0, sizeof(*id)); 3141 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr)); 3142 id->spi = x->id.spi; 3143 id->family = x->props.family; 3144 id->proto = x->id.proto; 3145 3146 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p)); 3147 err = -EMSGSIZE; 3148 if (attr == NULL) 3149 goto out_free_skb; 3150 3151 p = nla_data(attr); 3152 } 3153 err = copy_to_user_state_extra(x, p, skb); 3154 if (err) 3155 goto out_free_skb; 3156 3157 nlmsg_end(skb, nlh); 3158 3159 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA); 3160 3161 out_free_skb: 3162 kfree_skb(skb); 3163 return err; 3164 } 3165 3166 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c) 3167 { 3168 3169 switch (c->event) { 3170 case XFRM_MSG_EXPIRE: 3171 return xfrm_exp_state_notify(x, c); 3172 case XFRM_MSG_NEWAE: 3173 return xfrm_aevent_state_notify(x, c); 3174 case XFRM_MSG_DELSA: 3175 case XFRM_MSG_UPDSA: 3176 case XFRM_MSG_NEWSA: 3177 return xfrm_notify_sa(x, c); 3178 case XFRM_MSG_FLUSHSA: 3179 return xfrm_notify_sa_flush(c); 3180 default: 3181 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n", 3182 c->event); 3183 break; 3184 } 3185 3186 return 0; 3187 3188 } 3189 3190 static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x, 3191 struct xfrm_policy *xp) 3192 { 3193 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire)) 3194 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 3195 + nla_total_size(sizeof(struct xfrm_mark)) 3196 + nla_total_size(xfrm_user_sec_ctx_size(x->security)) 3197 + userpolicy_type_attrsize(); 3198 } 3199 3200 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x, 3201 struct xfrm_tmpl *xt, struct xfrm_policy *xp) 3202 { 3203 __u32 seq = xfrm_get_acqseq(); 3204 struct xfrm_user_acquire *ua; 3205 struct nlmsghdr *nlh; 3206 int err; 3207 3208 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0); 3209 if (nlh == NULL) 3210 return -EMSGSIZE; 3211 3212 ua = nlmsg_data(nlh); 3213 memcpy(&ua->id, &x->id, sizeof(ua->id)); 3214 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr)); 3215 memcpy(&ua->sel, &x->sel, sizeof(ua->sel)); 3216 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT); 3217 ua->aalgos = xt->aalgos; 3218 ua->ealgos = xt->ealgos; 3219 ua->calgos = xt->calgos; 3220 ua->seq = x->km.seq = seq; 3221 3222 err = copy_to_user_tmpl(xp, skb); 3223 if (!err) 3224 err = copy_to_user_state_sec_ctx(x, skb); 3225 if (!err) 3226 err = copy_to_user_policy_type(xp->type, skb); 3227 if (!err) 3228 err = xfrm_mark_put(skb, &xp->mark); 3229 if (!err) 3230 err = xfrm_if_id_put(skb, xp->if_id); 3231 if (err) { 3232 nlmsg_cancel(skb, nlh); 3233 return err; 3234 } 3235 3236 nlmsg_end(skb, nlh); 3237 return 0; 3238 } 3239 3240 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt, 3241 struct xfrm_policy *xp) 3242 { 3243 struct net *net = xs_net(x); 3244 struct sk_buff *skb; 3245 int err; 3246 3247 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC); 3248 if (skb == NULL) 3249 return -ENOMEM; 3250 3251 err = build_acquire(skb, x, xt, xp); 3252 BUG_ON(err < 0); 3253 3254 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE); 3255 } 3256 3257 /* User gives us xfrm_user_policy_info followed by an array of 0 3258 * or more templates. 3259 */ 3260 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt, 3261 u8 *data, int len, int *dir) 3262 { 3263 struct net *net = sock_net(sk); 3264 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data; 3265 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1); 3266 struct xfrm_policy *xp; 3267 int nr; 3268 3269 switch (sk->sk_family) { 3270 case AF_INET: 3271 if (opt != IP_XFRM_POLICY) { 3272 *dir = -EOPNOTSUPP; 3273 return NULL; 3274 } 3275 break; 3276 #if IS_ENABLED(CONFIG_IPV6) 3277 case AF_INET6: 3278 if (opt != IPV6_XFRM_POLICY) { 3279 *dir = -EOPNOTSUPP; 3280 return NULL; 3281 } 3282 break; 3283 #endif 3284 default: 3285 *dir = -EINVAL; 3286 return NULL; 3287 } 3288 3289 *dir = -EINVAL; 3290 3291 if (len < sizeof(*p) || 3292 verify_newpolicy_info(p)) 3293 return NULL; 3294 3295 nr = ((len - sizeof(*p)) / sizeof(*ut)); 3296 if (validate_tmpl(nr, ut, p->sel.family)) 3297 return NULL; 3298 3299 if (p->dir > XFRM_POLICY_OUT) 3300 return NULL; 3301 3302 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 3303 if (xp == NULL) { 3304 *dir = -ENOBUFS; 3305 return NULL; 3306 } 3307 3308 copy_from_user_policy(xp, p); 3309 xp->type = XFRM_POLICY_TYPE_MAIN; 3310 copy_templates(xp, ut, nr); 3311 3312 *dir = p->dir; 3313 3314 return xp; 3315 } 3316 3317 static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp) 3318 { 3319 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire)) 3320 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 3321 + nla_total_size(xfrm_user_sec_ctx_size(xp->security)) 3322 + nla_total_size(sizeof(struct xfrm_mark)) 3323 + userpolicy_type_attrsize(); 3324 } 3325 3326 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp, 3327 int dir, const struct km_event *c) 3328 { 3329 struct xfrm_user_polexpire *upe; 3330 int hard = c->data.hard; 3331 struct nlmsghdr *nlh; 3332 int err; 3333 3334 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0); 3335 if (nlh == NULL) 3336 return -EMSGSIZE; 3337 3338 upe = nlmsg_data(nlh); 3339 copy_to_user_policy(xp, &upe->pol, dir); 3340 err = copy_to_user_tmpl(xp, skb); 3341 if (!err) 3342 err = copy_to_user_sec_ctx(xp, skb); 3343 if (!err) 3344 err = copy_to_user_policy_type(xp->type, skb); 3345 if (!err) 3346 err = xfrm_mark_put(skb, &xp->mark); 3347 if (!err) 3348 err = xfrm_if_id_put(skb, xp->if_id); 3349 if (err) { 3350 nlmsg_cancel(skb, nlh); 3351 return err; 3352 } 3353 upe->hard = !!hard; 3354 3355 nlmsg_end(skb, nlh); 3356 return 0; 3357 } 3358 3359 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 3360 { 3361 struct net *net = xp_net(xp); 3362 struct sk_buff *skb; 3363 int err; 3364 3365 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC); 3366 if (skb == NULL) 3367 return -ENOMEM; 3368 3369 err = build_polexpire(skb, xp, dir, c); 3370 BUG_ON(err < 0); 3371 3372 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE); 3373 } 3374 3375 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) 3376 { 3377 unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); 3378 struct net *net = xp_net(xp); 3379 struct xfrm_userpolicy_info *p; 3380 struct xfrm_userpolicy_id *id; 3381 struct nlmsghdr *nlh; 3382 struct sk_buff *skb; 3383 unsigned int headlen; 3384 int err; 3385 3386 headlen = sizeof(*p); 3387 if (c->event == XFRM_MSG_DELPOLICY) { 3388 len += nla_total_size(headlen); 3389 headlen = sizeof(*id); 3390 } 3391 len += userpolicy_type_attrsize(); 3392 len += nla_total_size(sizeof(struct xfrm_mark)); 3393 len += NLMSG_ALIGN(headlen); 3394 3395 skb = nlmsg_new(len, GFP_ATOMIC); 3396 if (skb == NULL) 3397 return -ENOMEM; 3398 3399 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); 3400 err = -EMSGSIZE; 3401 if (nlh == NULL) 3402 goto out_free_skb; 3403 3404 p = nlmsg_data(nlh); 3405 if (c->event == XFRM_MSG_DELPOLICY) { 3406 struct nlattr *attr; 3407 3408 id = nlmsg_data(nlh); 3409 memset(id, 0, sizeof(*id)); 3410 id->dir = dir; 3411 if (c->data.byid) 3412 id->index = xp->index; 3413 else 3414 memcpy(&id->sel, &xp->selector, sizeof(id->sel)); 3415 3416 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p)); 3417 err = -EMSGSIZE; 3418 if (attr == NULL) 3419 goto out_free_skb; 3420 3421 p = nla_data(attr); 3422 } 3423 3424 copy_to_user_policy(xp, p, dir); 3425 err = copy_to_user_tmpl(xp, skb); 3426 if (!err) 3427 err = copy_to_user_policy_type(xp->type, skb); 3428 if (!err) 3429 err = xfrm_mark_put(skb, &xp->mark); 3430 if (!err) 3431 err = xfrm_if_id_put(skb, xp->if_id); 3432 if (err) 3433 goto out_free_skb; 3434 3435 nlmsg_end(skb, nlh); 3436 3437 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 3438 3439 out_free_skb: 3440 kfree_skb(skb); 3441 return err; 3442 } 3443 3444 static int xfrm_notify_policy_flush(const struct km_event *c) 3445 { 3446 struct net *net = c->net; 3447 struct nlmsghdr *nlh; 3448 struct sk_buff *skb; 3449 int err; 3450 3451 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC); 3452 if (skb == NULL) 3453 return -ENOMEM; 3454 3455 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0); 3456 err = -EMSGSIZE; 3457 if (nlh == NULL) 3458 goto out_free_skb; 3459 err = copy_to_user_policy_type(c->data.type, skb); 3460 if (err) 3461 goto out_free_skb; 3462 3463 nlmsg_end(skb, nlh); 3464 3465 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 3466 3467 out_free_skb: 3468 kfree_skb(skb); 3469 return err; 3470 } 3471 3472 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 3473 { 3474 3475 switch (c->event) { 3476 case XFRM_MSG_NEWPOLICY: 3477 case XFRM_MSG_UPDPOLICY: 3478 case XFRM_MSG_DELPOLICY: 3479 return xfrm_notify_policy(xp, dir, c); 3480 case XFRM_MSG_FLUSHPOLICY: 3481 return xfrm_notify_policy_flush(c); 3482 case XFRM_MSG_POLEXPIRE: 3483 return xfrm_exp_policy_notify(xp, dir, c); 3484 default: 3485 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n", 3486 c->event); 3487 } 3488 3489 return 0; 3490 3491 } 3492 3493 static inline unsigned int xfrm_report_msgsize(void) 3494 { 3495 return NLMSG_ALIGN(sizeof(struct xfrm_user_report)); 3496 } 3497 3498 static int build_report(struct sk_buff *skb, u8 proto, 3499 struct xfrm_selector *sel, xfrm_address_t *addr) 3500 { 3501 struct xfrm_user_report *ur; 3502 struct nlmsghdr *nlh; 3503 3504 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0); 3505 if (nlh == NULL) 3506 return -EMSGSIZE; 3507 3508 ur = nlmsg_data(nlh); 3509 ur->proto = proto; 3510 memcpy(&ur->sel, sel, sizeof(ur->sel)); 3511 3512 if (addr) { 3513 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr); 3514 if (err) { 3515 nlmsg_cancel(skb, nlh); 3516 return err; 3517 } 3518 } 3519 nlmsg_end(skb, nlh); 3520 return 0; 3521 } 3522 3523 static int xfrm_send_report(struct net *net, u8 proto, 3524 struct xfrm_selector *sel, xfrm_address_t *addr) 3525 { 3526 struct sk_buff *skb; 3527 int err; 3528 3529 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC); 3530 if (skb == NULL) 3531 return -ENOMEM; 3532 3533 err = build_report(skb, proto, sel, addr); 3534 BUG_ON(err < 0); 3535 3536 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT); 3537 } 3538 3539 static inline unsigned int xfrm_mapping_msgsize(void) 3540 { 3541 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping)); 3542 } 3543 3544 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x, 3545 xfrm_address_t *new_saddr, __be16 new_sport) 3546 { 3547 struct xfrm_user_mapping *um; 3548 struct nlmsghdr *nlh; 3549 3550 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0); 3551 if (nlh == NULL) 3552 return -EMSGSIZE; 3553 3554 um = nlmsg_data(nlh); 3555 3556 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr)); 3557 um->id.spi = x->id.spi; 3558 um->id.family = x->props.family; 3559 um->id.proto = x->id.proto; 3560 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr)); 3561 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr)); 3562 um->new_sport = new_sport; 3563 um->old_sport = x->encap->encap_sport; 3564 um->reqid = x->props.reqid; 3565 3566 nlmsg_end(skb, nlh); 3567 return 0; 3568 } 3569 3570 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, 3571 __be16 sport) 3572 { 3573 struct net *net = xs_net(x); 3574 struct sk_buff *skb; 3575 int err; 3576 3577 if (x->id.proto != IPPROTO_ESP) 3578 return -EINVAL; 3579 3580 if (!x->encap) 3581 return -EINVAL; 3582 3583 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC); 3584 if (skb == NULL) 3585 return -ENOMEM; 3586 3587 err = build_mapping(skb, x, ipaddr, sport); 3588 BUG_ON(err < 0); 3589 3590 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING); 3591 } 3592 3593 static bool xfrm_is_alive(const struct km_event *c) 3594 { 3595 return (bool)xfrm_acquire_is_on(c->net); 3596 } 3597 3598 static struct xfrm_mgr netlink_mgr = { 3599 .notify = xfrm_send_state_notify, 3600 .acquire = xfrm_send_acquire, 3601 .compile_policy = xfrm_compile_policy, 3602 .notify_policy = xfrm_send_policy_notify, 3603 .report = xfrm_send_report, 3604 .migrate = xfrm_send_migrate, 3605 .new_mapping = xfrm_send_mapping, 3606 .is_alive = xfrm_is_alive, 3607 }; 3608 3609 static int __net_init xfrm_user_net_init(struct net *net) 3610 { 3611 struct sock *nlsk; 3612 struct netlink_kernel_cfg cfg = { 3613 .groups = XFRMNLGRP_MAX, 3614 .input = xfrm_netlink_rcv, 3615 }; 3616 3617 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg); 3618 if (nlsk == NULL) 3619 return -ENOMEM; 3620 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */ 3621 rcu_assign_pointer(net->xfrm.nlsk, nlsk); 3622 return 0; 3623 } 3624 3625 static void __net_exit xfrm_user_net_pre_exit(struct net *net) 3626 { 3627 RCU_INIT_POINTER(net->xfrm.nlsk, NULL); 3628 } 3629 3630 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list) 3631 { 3632 struct net *net; 3633 3634 list_for_each_entry(net, net_exit_list, exit_list) 3635 netlink_kernel_release(net->xfrm.nlsk_stash); 3636 } 3637 3638 static struct pernet_operations xfrm_user_net_ops = { 3639 .init = xfrm_user_net_init, 3640 .pre_exit = xfrm_user_net_pre_exit, 3641 .exit_batch = xfrm_user_net_exit, 3642 }; 3643 3644 static int __init xfrm_user_init(void) 3645 { 3646 int rv; 3647 3648 printk(KERN_INFO "Initializing XFRM netlink socket\n"); 3649 3650 rv = register_pernet_subsys(&xfrm_user_net_ops); 3651 if (rv < 0) 3652 return rv; 3653 rv = xfrm_register_km(&netlink_mgr); 3654 if (rv < 0) 3655 unregister_pernet_subsys(&xfrm_user_net_ops); 3656 return rv; 3657 } 3658 3659 static void __exit xfrm_user_exit(void) 3660 { 3661 xfrm_unregister_km(&netlink_mgr); 3662 unregister_pernet_subsys(&xfrm_user_net_ops); 3663 } 3664 3665 module_init(xfrm_user_init); 3666 module_exit(xfrm_user_exit); 3667 MODULE_LICENSE("GPL"); 3668 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM); 3669