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