1 // SPDX-License-Identifier: GPL-2.0-only 2 /* xfrm_user.c: User interface to configure xfrm engine. 3 * 4 * Copyright (C) 2002 David S. Miller (davem@redhat.com) 5 * 6 * Changes: 7 * Mitsuru KANDA @USAGI 8 * Kazunori MIYAZAWA @USAGI 9 * Kunihiro Ishiguro <kunihiro@ipinfusion.com> 10 * IPv6 support 11 * 12 */ 13 14 #include <linux/compat.h> 15 #include <linux/crypto.h> 16 #include <linux/module.h> 17 #include <linux/kernel.h> 18 #include <linux/types.h> 19 #include <linux/slab.h> 20 #include <linux/socket.h> 21 #include <linux/string.h> 22 #include <linux/net.h> 23 #include <linux/skbuff.h> 24 #include <linux/pfkeyv2.h> 25 #include <linux/ipsec.h> 26 #include <linux/init.h> 27 #include <linux/security.h> 28 #include <net/sock.h> 29 #include <net/xfrm.h> 30 #include <net/netlink.h> 31 #include <net/ah.h> 32 #include <linux/uaccess.h> 33 #if IS_ENABLED(CONFIG_IPV6) 34 #include <linux/in6.h> 35 #endif 36 #include <asm/unaligned.h> 37 38 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type) 39 { 40 struct nlattr *rt = attrs[type]; 41 struct xfrm_algo *algp; 42 43 if (!rt) 44 return 0; 45 46 algp = nla_data(rt); 47 if (nla_len(rt) < (int)xfrm_alg_len(algp)) 48 return -EINVAL; 49 50 switch (type) { 51 case XFRMA_ALG_AUTH: 52 case XFRMA_ALG_CRYPT: 53 case XFRMA_ALG_COMP: 54 break; 55 56 default: 57 return -EINVAL; 58 } 59 60 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0'; 61 return 0; 62 } 63 64 static int verify_auth_trunc(struct nlattr **attrs) 65 { 66 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC]; 67 struct xfrm_algo_auth *algp; 68 69 if (!rt) 70 return 0; 71 72 algp = nla_data(rt); 73 if (nla_len(rt) < (int)xfrm_alg_auth_len(algp)) 74 return -EINVAL; 75 76 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0'; 77 return 0; 78 } 79 80 static int verify_aead(struct nlattr **attrs) 81 { 82 struct nlattr *rt = attrs[XFRMA_ALG_AEAD]; 83 struct xfrm_algo_aead *algp; 84 85 if (!rt) 86 return 0; 87 88 algp = nla_data(rt); 89 if (nla_len(rt) < (int)aead_len(algp)) 90 return -EINVAL; 91 92 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0'; 93 return 0; 94 } 95 96 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type, 97 xfrm_address_t **addrp) 98 { 99 struct nlattr *rt = attrs[type]; 100 101 if (rt && addrp) 102 *addrp = nla_data(rt); 103 } 104 105 static inline int verify_sec_ctx_len(struct nlattr **attrs) 106 { 107 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 108 struct xfrm_user_sec_ctx *uctx; 109 110 if (!rt) 111 return 0; 112 113 uctx = nla_data(rt); 114 if (uctx->len > nla_len(rt) || 115 uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len)) 116 return -EINVAL; 117 118 return 0; 119 } 120 121 static inline int verify_replay(struct xfrm_usersa_info *p, 122 struct nlattr **attrs) 123 { 124 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL]; 125 struct xfrm_replay_state_esn *rs; 126 127 if (!rt) 128 return (p->flags & XFRM_STATE_ESN) ? -EINVAL : 0; 129 130 rs = nla_data(rt); 131 132 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8) 133 return -EINVAL; 134 135 if (nla_len(rt) < (int)xfrm_replay_state_esn_len(rs) && 136 nla_len(rt) != sizeof(*rs)) 137 return -EINVAL; 138 139 /* As only ESP and AH support ESN feature. */ 140 if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH)) 141 return -EINVAL; 142 143 if (p->replay_window != 0) 144 return -EINVAL; 145 146 return 0; 147 } 148 149 static int verify_newsa_info(struct xfrm_usersa_info *p, 150 struct nlattr **attrs) 151 { 152 int err; 153 154 err = -EINVAL; 155 switch (p->family) { 156 case AF_INET: 157 break; 158 159 case AF_INET6: 160 #if IS_ENABLED(CONFIG_IPV6) 161 break; 162 #else 163 err = -EAFNOSUPPORT; 164 goto out; 165 #endif 166 167 default: 168 goto out; 169 } 170 171 switch (p->sel.family) { 172 case AF_UNSPEC: 173 break; 174 175 case AF_INET: 176 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32) 177 goto out; 178 179 break; 180 181 case AF_INET6: 182 #if IS_ENABLED(CONFIG_IPV6) 183 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128) 184 goto out; 185 186 break; 187 #else 188 err = -EAFNOSUPPORT; 189 goto out; 190 #endif 191 192 default: 193 goto out; 194 } 195 196 err = -EINVAL; 197 switch (p->id.proto) { 198 case IPPROTO_AH: 199 if ((!attrs[XFRMA_ALG_AUTH] && 200 !attrs[XFRMA_ALG_AUTH_TRUNC]) || 201 attrs[XFRMA_ALG_AEAD] || 202 attrs[XFRMA_ALG_CRYPT] || 203 attrs[XFRMA_ALG_COMP] || 204 attrs[XFRMA_TFCPAD]) 205 goto out; 206 break; 207 208 case IPPROTO_ESP: 209 if (attrs[XFRMA_ALG_COMP]) 210 goto out; 211 if (!attrs[XFRMA_ALG_AUTH] && 212 !attrs[XFRMA_ALG_AUTH_TRUNC] && 213 !attrs[XFRMA_ALG_CRYPT] && 214 !attrs[XFRMA_ALG_AEAD]) 215 goto out; 216 if ((attrs[XFRMA_ALG_AUTH] || 217 attrs[XFRMA_ALG_AUTH_TRUNC] || 218 attrs[XFRMA_ALG_CRYPT]) && 219 attrs[XFRMA_ALG_AEAD]) 220 goto out; 221 if (attrs[XFRMA_TFCPAD] && 222 p->mode != XFRM_MODE_TUNNEL) 223 goto out; 224 break; 225 226 case IPPROTO_COMP: 227 if (!attrs[XFRMA_ALG_COMP] || 228 attrs[XFRMA_ALG_AEAD] || 229 attrs[XFRMA_ALG_AUTH] || 230 attrs[XFRMA_ALG_AUTH_TRUNC] || 231 attrs[XFRMA_ALG_CRYPT] || 232 attrs[XFRMA_TFCPAD] || 233 (ntohl(p->id.spi) >= 0x10000)) 234 goto out; 235 break; 236 237 #if IS_ENABLED(CONFIG_IPV6) 238 case IPPROTO_DSTOPTS: 239 case IPPROTO_ROUTING: 240 if (attrs[XFRMA_ALG_COMP] || 241 attrs[XFRMA_ALG_AUTH] || 242 attrs[XFRMA_ALG_AUTH_TRUNC] || 243 attrs[XFRMA_ALG_AEAD] || 244 attrs[XFRMA_ALG_CRYPT] || 245 attrs[XFRMA_ENCAP] || 246 attrs[XFRMA_SEC_CTX] || 247 attrs[XFRMA_TFCPAD] || 248 !attrs[XFRMA_COADDR]) 249 goto out; 250 break; 251 #endif 252 253 default: 254 goto out; 255 } 256 257 if ((err = verify_aead(attrs))) 258 goto out; 259 if ((err = verify_auth_trunc(attrs))) 260 goto out; 261 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH))) 262 goto out; 263 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT))) 264 goto out; 265 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP))) 266 goto out; 267 if ((err = verify_sec_ctx_len(attrs))) 268 goto out; 269 if ((err = verify_replay(p, attrs))) 270 goto out; 271 272 err = -EINVAL; 273 switch (p->mode) { 274 case XFRM_MODE_TRANSPORT: 275 case XFRM_MODE_TUNNEL: 276 case XFRM_MODE_ROUTEOPTIMIZATION: 277 case XFRM_MODE_BEET: 278 break; 279 280 default: 281 goto out; 282 } 283 284 err = 0; 285 286 if (attrs[XFRMA_MTIMER_THRESH]) 287 if (!attrs[XFRMA_ENCAP]) 288 err = -EINVAL; 289 290 out: 291 return err; 292 } 293 294 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props, 295 struct xfrm_algo_desc *(*get_byname)(const char *, int), 296 struct nlattr *rta) 297 { 298 struct xfrm_algo *p, *ualg; 299 struct xfrm_algo_desc *algo; 300 301 if (!rta) 302 return 0; 303 304 ualg = nla_data(rta); 305 306 algo = get_byname(ualg->alg_name, 1); 307 if (!algo) 308 return -ENOSYS; 309 *props = algo->desc.sadb_alg_id; 310 311 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL); 312 if (!p) 313 return -ENOMEM; 314 315 strcpy(p->alg_name, algo->name); 316 *algpp = p; 317 return 0; 318 } 319 320 static int attach_crypt(struct xfrm_state *x, struct nlattr *rta) 321 { 322 struct xfrm_algo *p, *ualg; 323 struct xfrm_algo_desc *algo; 324 325 if (!rta) 326 return 0; 327 328 ualg = nla_data(rta); 329 330 algo = xfrm_ealg_get_byname(ualg->alg_name, 1); 331 if (!algo) 332 return -ENOSYS; 333 x->props.ealgo = algo->desc.sadb_alg_id; 334 335 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL); 336 if (!p) 337 return -ENOMEM; 338 339 strcpy(p->alg_name, algo->name); 340 x->ealg = p; 341 x->geniv = algo->uinfo.encr.geniv; 342 return 0; 343 } 344 345 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props, 346 struct nlattr *rta) 347 { 348 struct xfrm_algo *ualg; 349 struct xfrm_algo_auth *p; 350 struct xfrm_algo_desc *algo; 351 352 if (!rta) 353 return 0; 354 355 ualg = nla_data(rta); 356 357 algo = xfrm_aalg_get_byname(ualg->alg_name, 1); 358 if (!algo) 359 return -ENOSYS; 360 *props = algo->desc.sadb_alg_id; 361 362 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL); 363 if (!p) 364 return -ENOMEM; 365 366 strcpy(p->alg_name, algo->name); 367 p->alg_key_len = ualg->alg_key_len; 368 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; 369 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8); 370 371 *algpp = p; 372 return 0; 373 } 374 375 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props, 376 struct nlattr *rta) 377 { 378 struct xfrm_algo_auth *p, *ualg; 379 struct xfrm_algo_desc *algo; 380 381 if (!rta) 382 return 0; 383 384 ualg = nla_data(rta); 385 386 algo = xfrm_aalg_get_byname(ualg->alg_name, 1); 387 if (!algo) 388 return -ENOSYS; 389 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits) 390 return -EINVAL; 391 *props = algo->desc.sadb_alg_id; 392 393 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL); 394 if (!p) 395 return -ENOMEM; 396 397 strcpy(p->alg_name, algo->name); 398 if (!p->alg_trunc_len) 399 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; 400 401 *algpp = p; 402 return 0; 403 } 404 405 static int attach_aead(struct xfrm_state *x, struct nlattr *rta) 406 { 407 struct xfrm_algo_aead *p, *ualg; 408 struct xfrm_algo_desc *algo; 409 410 if (!rta) 411 return 0; 412 413 ualg = nla_data(rta); 414 415 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1); 416 if (!algo) 417 return -ENOSYS; 418 x->props.ealgo = algo->desc.sadb_alg_id; 419 420 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL); 421 if (!p) 422 return -ENOMEM; 423 424 strcpy(p->alg_name, algo->name); 425 x->aead = p; 426 x->geniv = algo->uinfo.aead.geniv; 427 return 0; 428 } 429 430 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn, 431 struct nlattr *rp) 432 { 433 struct xfrm_replay_state_esn *up; 434 unsigned int ulen; 435 436 if (!replay_esn || !rp) 437 return 0; 438 439 up = nla_data(rp); 440 ulen = xfrm_replay_state_esn_len(up); 441 442 /* Check the overall length and the internal bitmap length to avoid 443 * potential overflow. */ 444 if (nla_len(rp) < (int)ulen || 445 xfrm_replay_state_esn_len(replay_esn) != ulen || 446 replay_esn->bmp_len != up->bmp_len) 447 return -EINVAL; 448 449 if (up->replay_window > up->bmp_len * sizeof(__u32) * 8) 450 return -EINVAL; 451 452 return 0; 453 } 454 455 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn, 456 struct xfrm_replay_state_esn **preplay_esn, 457 struct nlattr *rta) 458 { 459 struct xfrm_replay_state_esn *p, *pp, *up; 460 unsigned int klen, ulen; 461 462 if (!rta) 463 return 0; 464 465 up = nla_data(rta); 466 klen = xfrm_replay_state_esn_len(up); 467 ulen = nla_len(rta) >= (int)klen ? klen : sizeof(*up); 468 469 p = kzalloc(klen, GFP_KERNEL); 470 if (!p) 471 return -ENOMEM; 472 473 pp = kzalloc(klen, GFP_KERNEL); 474 if (!pp) { 475 kfree(p); 476 return -ENOMEM; 477 } 478 479 memcpy(p, up, ulen); 480 memcpy(pp, up, ulen); 481 482 *replay_esn = p; 483 *preplay_esn = pp; 484 485 return 0; 486 } 487 488 static inline unsigned int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx) 489 { 490 unsigned int len = 0; 491 492 if (xfrm_ctx) { 493 len += sizeof(struct xfrm_user_sec_ctx); 494 len += xfrm_ctx->ctx_len; 495 } 496 return len; 497 } 498 499 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 500 { 501 memcpy(&x->id, &p->id, sizeof(x->id)); 502 memcpy(&x->sel, &p->sel, sizeof(x->sel)); 503 memcpy(&x->lft, &p->lft, sizeof(x->lft)); 504 x->props.mode = p->mode; 505 x->props.replay_window = min_t(unsigned int, p->replay_window, 506 sizeof(x->replay.bitmap) * 8); 507 x->props.reqid = p->reqid; 508 x->props.family = p->family; 509 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr)); 510 x->props.flags = p->flags; 511 512 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC)) 513 x->sel.family = p->family; 514 } 515 516 /* 517 * someday when pfkey also has support, we could have the code 518 * somehow made shareable and move it to xfrm_state.c - JHS 519 * 520 */ 521 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs, 522 int update_esn) 523 { 524 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 525 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL; 526 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 527 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; 528 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; 529 struct nlattr *mt = attrs[XFRMA_MTIMER_THRESH]; 530 531 if (re) { 532 struct xfrm_replay_state_esn *replay_esn; 533 replay_esn = nla_data(re); 534 memcpy(x->replay_esn, replay_esn, 535 xfrm_replay_state_esn_len(replay_esn)); 536 memcpy(x->preplay_esn, replay_esn, 537 xfrm_replay_state_esn_len(replay_esn)); 538 } 539 540 if (rp) { 541 struct xfrm_replay_state *replay; 542 replay = nla_data(rp); 543 memcpy(&x->replay, replay, sizeof(*replay)); 544 memcpy(&x->preplay, replay, sizeof(*replay)); 545 } 546 547 if (lt) { 548 struct xfrm_lifetime_cur *ltime; 549 ltime = nla_data(lt); 550 x->curlft.bytes = ltime->bytes; 551 x->curlft.packets = ltime->packets; 552 x->curlft.add_time = ltime->add_time; 553 x->curlft.use_time = ltime->use_time; 554 } 555 556 if (et) 557 x->replay_maxage = nla_get_u32(et); 558 559 if (rt) 560 x->replay_maxdiff = nla_get_u32(rt); 561 562 if (mt) 563 x->mapping_maxage = nla_get_u32(mt); 564 } 565 566 static void xfrm_smark_init(struct nlattr **attrs, struct xfrm_mark *m) 567 { 568 if (attrs[XFRMA_SET_MARK]) { 569 m->v = nla_get_u32(attrs[XFRMA_SET_MARK]); 570 if (attrs[XFRMA_SET_MARK_MASK]) 571 m->m = nla_get_u32(attrs[XFRMA_SET_MARK_MASK]); 572 else 573 m->m = 0xffffffff; 574 } else { 575 m->v = m->m = 0; 576 } 577 } 578 579 static struct xfrm_state *xfrm_state_construct(struct net *net, 580 struct xfrm_usersa_info *p, 581 struct nlattr **attrs, 582 int *errp) 583 { 584 struct xfrm_state *x = xfrm_state_alloc(net); 585 int err = -ENOMEM; 586 587 if (!x) 588 goto error_no_put; 589 590 copy_from_user_state(x, p); 591 592 if (attrs[XFRMA_ENCAP]) { 593 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]), 594 sizeof(*x->encap), GFP_KERNEL); 595 if (x->encap == NULL) 596 goto error; 597 } 598 599 if (attrs[XFRMA_COADDR]) { 600 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]), 601 sizeof(*x->coaddr), GFP_KERNEL); 602 if (x->coaddr == NULL) 603 goto error; 604 } 605 606 if (attrs[XFRMA_SA_EXTRA_FLAGS]) 607 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]); 608 609 if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD]))) 610 goto error; 611 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo, 612 attrs[XFRMA_ALG_AUTH_TRUNC]))) 613 goto error; 614 if (!x->props.aalgo) { 615 if ((err = attach_auth(&x->aalg, &x->props.aalgo, 616 attrs[XFRMA_ALG_AUTH]))) 617 goto error; 618 } 619 if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT]))) 620 goto error; 621 if ((err = attach_one_algo(&x->calg, &x->props.calgo, 622 xfrm_calg_get_byname, 623 attrs[XFRMA_ALG_COMP]))) 624 goto error; 625 626 if (attrs[XFRMA_TFCPAD]) 627 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]); 628 629 xfrm_mark_get(attrs, &x->mark); 630 631 xfrm_smark_init(attrs, &x->props.smark); 632 633 if (attrs[XFRMA_IF_ID]) 634 x->if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 635 636 err = __xfrm_init_state(x, false, attrs[XFRMA_OFFLOAD_DEV]); 637 if (err) 638 goto error; 639 640 if (attrs[XFRMA_SEC_CTX]) { 641 err = security_xfrm_state_alloc(x, 642 nla_data(attrs[XFRMA_SEC_CTX])); 643 if (err) 644 goto error; 645 } 646 647 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn, 648 attrs[XFRMA_REPLAY_ESN_VAL]))) 649 goto error; 650 651 x->km.seq = p->seq; 652 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth; 653 /* sysctl_xfrm_aevent_etime is in 100ms units */ 654 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M; 655 656 if ((err = xfrm_init_replay(x))) 657 goto error; 658 659 /* override default values from above */ 660 xfrm_update_ae_params(x, attrs, 0); 661 662 /* configure the hardware if offload is requested */ 663 if (attrs[XFRMA_OFFLOAD_DEV]) { 664 err = xfrm_dev_state_add(net, x, 665 nla_data(attrs[XFRMA_OFFLOAD_DEV])); 666 if (err) 667 goto error; 668 } 669 670 return x; 671 672 error: 673 x->km.state = XFRM_STATE_DEAD; 674 xfrm_state_put(x); 675 error_no_put: 676 *errp = err; 677 return NULL; 678 } 679 680 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 681 struct nlattr **attrs) 682 { 683 struct net *net = sock_net(skb->sk); 684 struct xfrm_usersa_info *p = nlmsg_data(nlh); 685 struct xfrm_state *x; 686 int err; 687 struct km_event c; 688 689 err = verify_newsa_info(p, attrs); 690 if (err) 691 return err; 692 693 x = xfrm_state_construct(net, p, attrs, &err); 694 if (!x) 695 return err; 696 697 xfrm_state_hold(x); 698 if (nlh->nlmsg_type == XFRM_MSG_NEWSA) 699 err = xfrm_state_add(x); 700 else 701 err = xfrm_state_update(x); 702 703 xfrm_audit_state_add(x, err ? 0 : 1, true); 704 705 if (err < 0) { 706 x->km.state = XFRM_STATE_DEAD; 707 xfrm_dev_state_delete(x); 708 __xfrm_state_put(x); 709 goto out; 710 } 711 712 if (x->km.state == XFRM_STATE_VOID) 713 x->km.state = XFRM_STATE_VALID; 714 715 c.seq = nlh->nlmsg_seq; 716 c.portid = nlh->nlmsg_pid; 717 c.event = nlh->nlmsg_type; 718 719 km_state_notify(x, &c); 720 out: 721 xfrm_state_put(x); 722 return err; 723 } 724 725 static struct xfrm_state *xfrm_user_state_lookup(struct net *net, 726 struct xfrm_usersa_id *p, 727 struct nlattr **attrs, 728 int *errp) 729 { 730 struct xfrm_state *x = NULL; 731 struct xfrm_mark m; 732 int err; 733 u32 mark = xfrm_mark_get(attrs, &m); 734 735 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) { 736 err = -ESRCH; 737 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family); 738 } else { 739 xfrm_address_t *saddr = NULL; 740 741 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr); 742 if (!saddr) { 743 err = -EINVAL; 744 goto out; 745 } 746 747 err = -ESRCH; 748 x = xfrm_state_lookup_byaddr(net, mark, 749 &p->daddr, saddr, 750 p->proto, p->family); 751 } 752 753 out: 754 if (!x && errp) 755 *errp = err; 756 return x; 757 } 758 759 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 760 struct nlattr **attrs) 761 { 762 struct net *net = sock_net(skb->sk); 763 struct xfrm_state *x; 764 int err = -ESRCH; 765 struct km_event c; 766 struct xfrm_usersa_id *p = nlmsg_data(nlh); 767 768 x = xfrm_user_state_lookup(net, p, attrs, &err); 769 if (x == NULL) 770 return err; 771 772 if ((err = security_xfrm_state_delete(x)) != 0) 773 goto out; 774 775 if (xfrm_state_kern(x)) { 776 err = -EPERM; 777 goto out; 778 } 779 780 err = xfrm_state_delete(x); 781 782 if (err < 0) 783 goto out; 784 785 c.seq = nlh->nlmsg_seq; 786 c.portid = nlh->nlmsg_pid; 787 c.event = nlh->nlmsg_type; 788 km_state_notify(x, &c); 789 790 out: 791 xfrm_audit_state_delete(x, err ? 0 : 1, true); 792 xfrm_state_put(x); 793 return err; 794 } 795 796 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 797 { 798 memset(p, 0, sizeof(*p)); 799 memcpy(&p->id, &x->id, sizeof(p->id)); 800 memcpy(&p->sel, &x->sel, sizeof(p->sel)); 801 memcpy(&p->lft, &x->lft, sizeof(p->lft)); 802 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft)); 803 put_unaligned(x->stats.replay_window, &p->stats.replay_window); 804 put_unaligned(x->stats.replay, &p->stats.replay); 805 put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed); 806 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr)); 807 p->mode = x->props.mode; 808 p->replay_window = x->props.replay_window; 809 p->reqid = x->props.reqid; 810 p->family = x->props.family; 811 p->flags = x->props.flags; 812 p->seq = x->km.seq; 813 } 814 815 struct xfrm_dump_info { 816 struct sk_buff *in_skb; 817 struct sk_buff *out_skb; 818 u32 nlmsg_seq; 819 u16 nlmsg_flags; 820 }; 821 822 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb) 823 { 824 struct xfrm_user_sec_ctx *uctx; 825 struct nlattr *attr; 826 int ctx_size = sizeof(*uctx) + s->ctx_len; 827 828 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size); 829 if (attr == NULL) 830 return -EMSGSIZE; 831 832 uctx = nla_data(attr); 833 uctx->exttype = XFRMA_SEC_CTX; 834 uctx->len = ctx_size; 835 uctx->ctx_doi = s->ctx_doi; 836 uctx->ctx_alg = s->ctx_alg; 837 uctx->ctx_len = s->ctx_len; 838 memcpy(uctx + 1, s->ctx_str, s->ctx_len); 839 840 return 0; 841 } 842 843 static int copy_user_offload(struct xfrm_state_offload *xso, struct sk_buff *skb) 844 { 845 struct xfrm_user_offload *xuo; 846 struct nlattr *attr; 847 848 attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo)); 849 if (attr == NULL) 850 return -EMSGSIZE; 851 852 xuo = nla_data(attr); 853 memset(xuo, 0, sizeof(*xuo)); 854 xuo->ifindex = xso->dev->ifindex; 855 xuo->flags = xso->flags; 856 857 return 0; 858 } 859 860 static bool xfrm_redact(void) 861 { 862 return IS_ENABLED(CONFIG_SECURITY) && 863 security_locked_down(LOCKDOWN_XFRM_SECRET); 864 } 865 866 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb) 867 { 868 struct xfrm_algo *algo; 869 struct xfrm_algo_auth *ap; 870 struct nlattr *nla; 871 bool redact_secret = xfrm_redact(); 872 873 nla = nla_reserve(skb, XFRMA_ALG_AUTH, 874 sizeof(*algo) + (auth->alg_key_len + 7) / 8); 875 if (!nla) 876 return -EMSGSIZE; 877 algo = nla_data(nla); 878 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name)); 879 880 if (redact_secret && auth->alg_key_len) 881 memset(algo->alg_key, 0, (auth->alg_key_len + 7) / 8); 882 else 883 memcpy(algo->alg_key, auth->alg_key, 884 (auth->alg_key_len + 7) / 8); 885 algo->alg_key_len = auth->alg_key_len; 886 887 nla = nla_reserve(skb, XFRMA_ALG_AUTH_TRUNC, xfrm_alg_auth_len(auth)); 888 if (!nla) 889 return -EMSGSIZE; 890 ap = nla_data(nla); 891 memcpy(ap, auth, sizeof(struct xfrm_algo_auth)); 892 if (redact_secret && auth->alg_key_len) 893 memset(ap->alg_key, 0, (auth->alg_key_len + 7) / 8); 894 else 895 memcpy(ap->alg_key, auth->alg_key, 896 (auth->alg_key_len + 7) / 8); 897 return 0; 898 } 899 900 static int copy_to_user_aead(struct xfrm_algo_aead *aead, struct sk_buff *skb) 901 { 902 struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_AEAD, aead_len(aead)); 903 struct xfrm_algo_aead *ap; 904 bool redact_secret = xfrm_redact(); 905 906 if (!nla) 907 return -EMSGSIZE; 908 909 ap = nla_data(nla); 910 memcpy(ap, aead, sizeof(*aead)); 911 912 if (redact_secret && aead->alg_key_len) 913 memset(ap->alg_key, 0, (aead->alg_key_len + 7) / 8); 914 else 915 memcpy(ap->alg_key, aead->alg_key, 916 (aead->alg_key_len + 7) / 8); 917 return 0; 918 } 919 920 static int copy_to_user_ealg(struct xfrm_algo *ealg, struct sk_buff *skb) 921 { 922 struct xfrm_algo *ap; 923 bool redact_secret = xfrm_redact(); 924 struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_CRYPT, 925 xfrm_alg_len(ealg)); 926 if (!nla) 927 return -EMSGSIZE; 928 929 ap = nla_data(nla); 930 memcpy(ap, ealg, sizeof(*ealg)); 931 932 if (redact_secret && ealg->alg_key_len) 933 memset(ap->alg_key, 0, (ealg->alg_key_len + 7) / 8); 934 else 935 memcpy(ap->alg_key, ealg->alg_key, 936 (ealg->alg_key_len + 7) / 8); 937 938 return 0; 939 } 940 941 static int xfrm_smark_put(struct sk_buff *skb, struct xfrm_mark *m) 942 { 943 int ret = 0; 944 945 if (m->v | m->m) { 946 ret = nla_put_u32(skb, XFRMA_SET_MARK, m->v); 947 if (!ret) 948 ret = nla_put_u32(skb, XFRMA_SET_MARK_MASK, m->m); 949 } 950 return ret; 951 } 952 953 /* Don't change this without updating xfrm_sa_len! */ 954 static int copy_to_user_state_extra(struct xfrm_state *x, 955 struct xfrm_usersa_info *p, 956 struct sk_buff *skb) 957 { 958 int ret = 0; 959 960 copy_to_user_state(x, p); 961 962 if (x->props.extra_flags) { 963 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS, 964 x->props.extra_flags); 965 if (ret) 966 goto out; 967 } 968 969 if (x->coaddr) { 970 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr); 971 if (ret) 972 goto out; 973 } 974 if (x->lastused) { 975 ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused, 976 XFRMA_PAD); 977 if (ret) 978 goto out; 979 } 980 if (x->aead) { 981 ret = copy_to_user_aead(x->aead, skb); 982 if (ret) 983 goto out; 984 } 985 if (x->aalg) { 986 ret = copy_to_user_auth(x->aalg, skb); 987 if (ret) 988 goto out; 989 } 990 if (x->ealg) { 991 ret = copy_to_user_ealg(x->ealg, skb); 992 if (ret) 993 goto out; 994 } 995 if (x->calg) { 996 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg); 997 if (ret) 998 goto out; 999 } 1000 if (x->encap) { 1001 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap); 1002 if (ret) 1003 goto out; 1004 } 1005 if (x->tfcpad) { 1006 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad); 1007 if (ret) 1008 goto out; 1009 } 1010 ret = xfrm_mark_put(skb, &x->mark); 1011 if (ret) 1012 goto out; 1013 1014 ret = xfrm_smark_put(skb, &x->props.smark); 1015 if (ret) 1016 goto out; 1017 1018 if (x->replay_esn) 1019 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL, 1020 xfrm_replay_state_esn_len(x->replay_esn), 1021 x->replay_esn); 1022 else 1023 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), 1024 &x->replay); 1025 if (ret) 1026 goto out; 1027 if(x->xso.dev) 1028 ret = copy_user_offload(&x->xso, skb); 1029 if (ret) 1030 goto out; 1031 if (x->if_id) { 1032 ret = nla_put_u32(skb, XFRMA_IF_ID, x->if_id); 1033 if (ret) 1034 goto out; 1035 } 1036 if (x->security) { 1037 ret = copy_sec_ctx(x->security, skb); 1038 if (ret) 1039 goto out; 1040 } 1041 if (x->mapping_maxage) 1042 ret = nla_put_u32(skb, XFRMA_MTIMER_THRESH, x->mapping_maxage); 1043 out: 1044 return ret; 1045 } 1046 1047 static int dump_one_state(struct xfrm_state *x, int count, void *ptr) 1048 { 1049 struct xfrm_dump_info *sp = ptr; 1050 struct sk_buff *in_skb = sp->in_skb; 1051 struct sk_buff *skb = sp->out_skb; 1052 struct xfrm_translator *xtr; 1053 struct xfrm_usersa_info *p; 1054 struct nlmsghdr *nlh; 1055 int err; 1056 1057 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, 1058 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags); 1059 if (nlh == NULL) 1060 return -EMSGSIZE; 1061 1062 p = nlmsg_data(nlh); 1063 1064 err = copy_to_user_state_extra(x, p, skb); 1065 if (err) { 1066 nlmsg_cancel(skb, nlh); 1067 return err; 1068 } 1069 nlmsg_end(skb, nlh); 1070 1071 xtr = xfrm_get_translator(); 1072 if (xtr) { 1073 err = xtr->alloc_compat(skb, nlh); 1074 1075 xfrm_put_translator(xtr); 1076 if (err) { 1077 nlmsg_cancel(skb, nlh); 1078 return err; 1079 } 1080 } 1081 1082 return 0; 1083 } 1084 1085 static int xfrm_dump_sa_done(struct netlink_callback *cb) 1086 { 1087 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 1088 struct sock *sk = cb->skb->sk; 1089 struct net *net = sock_net(sk); 1090 1091 if (cb->args[0]) 1092 xfrm_state_walk_done(walk, net); 1093 return 0; 1094 } 1095 1096 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb) 1097 { 1098 struct net *net = sock_net(skb->sk); 1099 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 1100 struct xfrm_dump_info info; 1101 1102 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) > 1103 sizeof(cb->args) - sizeof(cb->args[0])); 1104 1105 info.in_skb = cb->skb; 1106 info.out_skb = skb; 1107 info.nlmsg_seq = cb->nlh->nlmsg_seq; 1108 info.nlmsg_flags = NLM_F_MULTI; 1109 1110 if (!cb->args[0]) { 1111 struct nlattr *attrs[XFRMA_MAX+1]; 1112 struct xfrm_address_filter *filter = NULL; 1113 u8 proto = 0; 1114 int err; 1115 1116 err = nlmsg_parse_deprecated(cb->nlh, 0, attrs, XFRMA_MAX, 1117 xfrma_policy, cb->extack); 1118 if (err < 0) 1119 return err; 1120 1121 if (attrs[XFRMA_ADDRESS_FILTER]) { 1122 filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]), 1123 sizeof(*filter), GFP_KERNEL); 1124 if (filter == NULL) 1125 return -ENOMEM; 1126 } 1127 1128 if (attrs[XFRMA_PROTO]) 1129 proto = nla_get_u8(attrs[XFRMA_PROTO]); 1130 1131 xfrm_state_walk_init(walk, proto, filter); 1132 cb->args[0] = 1; 1133 } 1134 1135 (void) xfrm_state_walk(net, walk, dump_one_state, &info); 1136 1137 return skb->len; 1138 } 1139 1140 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb, 1141 struct xfrm_state *x, u32 seq) 1142 { 1143 struct xfrm_dump_info info; 1144 struct sk_buff *skb; 1145 int err; 1146 1147 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1148 if (!skb) 1149 return ERR_PTR(-ENOMEM); 1150 1151 info.in_skb = in_skb; 1152 info.out_skb = skb; 1153 info.nlmsg_seq = seq; 1154 info.nlmsg_flags = 0; 1155 1156 err = dump_one_state(x, 0, &info); 1157 if (err) { 1158 kfree_skb(skb); 1159 return ERR_PTR(err); 1160 } 1161 1162 return skb; 1163 } 1164 1165 /* A wrapper for nlmsg_multicast() checking that nlsk is still available. 1166 * Must be called with RCU read lock. 1167 */ 1168 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb, 1169 u32 pid, unsigned int group) 1170 { 1171 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk); 1172 struct xfrm_translator *xtr; 1173 1174 if (!nlsk) { 1175 kfree_skb(skb); 1176 return -EPIPE; 1177 } 1178 1179 xtr = xfrm_get_translator(); 1180 if (xtr) { 1181 int err = xtr->alloc_compat(skb, nlmsg_hdr(skb)); 1182 1183 xfrm_put_translator(xtr); 1184 if (err) { 1185 kfree_skb(skb); 1186 return err; 1187 } 1188 } 1189 1190 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC); 1191 } 1192 1193 static inline unsigned int xfrm_spdinfo_msgsize(void) 1194 { 1195 return NLMSG_ALIGN(4) 1196 + nla_total_size(sizeof(struct xfrmu_spdinfo)) 1197 + nla_total_size(sizeof(struct xfrmu_spdhinfo)) 1198 + nla_total_size(sizeof(struct xfrmu_spdhthresh)) 1199 + nla_total_size(sizeof(struct xfrmu_spdhthresh)); 1200 } 1201 1202 static int build_spdinfo(struct sk_buff *skb, struct net *net, 1203 u32 portid, u32 seq, u32 flags) 1204 { 1205 struct xfrmk_spdinfo si; 1206 struct xfrmu_spdinfo spc; 1207 struct xfrmu_spdhinfo sph; 1208 struct xfrmu_spdhthresh spt4, spt6; 1209 struct nlmsghdr *nlh; 1210 int err; 1211 u32 *f; 1212 unsigned lseq; 1213 1214 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0); 1215 if (nlh == NULL) /* shouldn't really happen ... */ 1216 return -EMSGSIZE; 1217 1218 f = nlmsg_data(nlh); 1219 *f = flags; 1220 xfrm_spd_getinfo(net, &si); 1221 spc.incnt = si.incnt; 1222 spc.outcnt = si.outcnt; 1223 spc.fwdcnt = si.fwdcnt; 1224 spc.inscnt = si.inscnt; 1225 spc.outscnt = si.outscnt; 1226 spc.fwdscnt = si.fwdscnt; 1227 sph.spdhcnt = si.spdhcnt; 1228 sph.spdhmcnt = si.spdhmcnt; 1229 1230 do { 1231 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock); 1232 1233 spt4.lbits = net->xfrm.policy_hthresh.lbits4; 1234 spt4.rbits = net->xfrm.policy_hthresh.rbits4; 1235 spt6.lbits = net->xfrm.policy_hthresh.lbits6; 1236 spt6.rbits = net->xfrm.policy_hthresh.rbits6; 1237 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq)); 1238 1239 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc); 1240 if (!err) 1241 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph); 1242 if (!err) 1243 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4); 1244 if (!err) 1245 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6); 1246 if (err) { 1247 nlmsg_cancel(skb, nlh); 1248 return err; 1249 } 1250 1251 nlmsg_end(skb, nlh); 1252 return 0; 1253 } 1254 1255 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1256 struct nlattr **attrs) 1257 { 1258 struct net *net = sock_net(skb->sk); 1259 struct xfrmu_spdhthresh *thresh4 = NULL; 1260 struct xfrmu_spdhthresh *thresh6 = NULL; 1261 1262 /* selector prefixlen thresholds to hash policies */ 1263 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) { 1264 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH]; 1265 1266 if (nla_len(rta) < sizeof(*thresh4)) 1267 return -EINVAL; 1268 thresh4 = nla_data(rta); 1269 if (thresh4->lbits > 32 || thresh4->rbits > 32) 1270 return -EINVAL; 1271 } 1272 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) { 1273 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH]; 1274 1275 if (nla_len(rta) < sizeof(*thresh6)) 1276 return -EINVAL; 1277 thresh6 = nla_data(rta); 1278 if (thresh6->lbits > 128 || thresh6->rbits > 128) 1279 return -EINVAL; 1280 } 1281 1282 if (thresh4 || thresh6) { 1283 write_seqlock(&net->xfrm.policy_hthresh.lock); 1284 if (thresh4) { 1285 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits; 1286 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits; 1287 } 1288 if (thresh6) { 1289 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits; 1290 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits; 1291 } 1292 write_sequnlock(&net->xfrm.policy_hthresh.lock); 1293 1294 xfrm_policy_hash_rebuild(net); 1295 } 1296 1297 return 0; 1298 } 1299 1300 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1301 struct nlattr **attrs) 1302 { 1303 struct net *net = sock_net(skb->sk); 1304 struct sk_buff *r_skb; 1305 u32 *flags = nlmsg_data(nlh); 1306 u32 sportid = NETLINK_CB(skb).portid; 1307 u32 seq = nlh->nlmsg_seq; 1308 int err; 1309 1310 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC); 1311 if (r_skb == NULL) 1312 return -ENOMEM; 1313 1314 err = build_spdinfo(r_skb, net, sportid, seq, *flags); 1315 BUG_ON(err < 0); 1316 1317 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); 1318 } 1319 1320 static inline unsigned int xfrm_sadinfo_msgsize(void) 1321 { 1322 return NLMSG_ALIGN(4) 1323 + nla_total_size(sizeof(struct xfrmu_sadhinfo)) 1324 + nla_total_size(4); /* XFRMA_SAD_CNT */ 1325 } 1326 1327 static int build_sadinfo(struct sk_buff *skb, struct net *net, 1328 u32 portid, u32 seq, u32 flags) 1329 { 1330 struct xfrmk_sadinfo si; 1331 struct xfrmu_sadhinfo sh; 1332 struct nlmsghdr *nlh; 1333 int err; 1334 u32 *f; 1335 1336 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0); 1337 if (nlh == NULL) /* shouldn't really happen ... */ 1338 return -EMSGSIZE; 1339 1340 f = nlmsg_data(nlh); 1341 *f = flags; 1342 xfrm_sad_getinfo(net, &si); 1343 1344 sh.sadhmcnt = si.sadhmcnt; 1345 sh.sadhcnt = si.sadhcnt; 1346 1347 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt); 1348 if (!err) 1349 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh); 1350 if (err) { 1351 nlmsg_cancel(skb, nlh); 1352 return err; 1353 } 1354 1355 nlmsg_end(skb, nlh); 1356 return 0; 1357 } 1358 1359 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1360 struct nlattr **attrs) 1361 { 1362 struct net *net = sock_net(skb->sk); 1363 struct sk_buff *r_skb; 1364 u32 *flags = nlmsg_data(nlh); 1365 u32 sportid = NETLINK_CB(skb).portid; 1366 u32 seq = nlh->nlmsg_seq; 1367 int err; 1368 1369 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC); 1370 if (r_skb == NULL) 1371 return -ENOMEM; 1372 1373 err = build_sadinfo(r_skb, net, sportid, seq, *flags); 1374 BUG_ON(err < 0); 1375 1376 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); 1377 } 1378 1379 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 1380 struct nlattr **attrs) 1381 { 1382 struct net *net = sock_net(skb->sk); 1383 struct xfrm_usersa_id *p = nlmsg_data(nlh); 1384 struct xfrm_state *x; 1385 struct sk_buff *resp_skb; 1386 int err = -ESRCH; 1387 1388 x = xfrm_user_state_lookup(net, p, attrs, &err); 1389 if (x == NULL) 1390 goto out_noput; 1391 1392 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 1393 if (IS_ERR(resp_skb)) { 1394 err = PTR_ERR(resp_skb); 1395 } else { 1396 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); 1397 } 1398 xfrm_state_put(x); 1399 out_noput: 1400 return err; 1401 } 1402 1403 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, 1404 struct nlattr **attrs) 1405 { 1406 struct net *net = sock_net(skb->sk); 1407 struct xfrm_state *x; 1408 struct xfrm_userspi_info *p; 1409 struct xfrm_translator *xtr; 1410 struct sk_buff *resp_skb; 1411 xfrm_address_t *daddr; 1412 int family; 1413 int err; 1414 u32 mark; 1415 struct xfrm_mark m; 1416 u32 if_id = 0; 1417 1418 p = nlmsg_data(nlh); 1419 err = verify_spi_info(p->info.id.proto, p->min, p->max); 1420 if (err) 1421 goto out_noput; 1422 1423 family = p->info.family; 1424 daddr = &p->info.id.daddr; 1425 1426 x = NULL; 1427 1428 mark = xfrm_mark_get(attrs, &m); 1429 1430 if (attrs[XFRMA_IF_ID]) 1431 if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 1432 1433 if (p->info.seq) { 1434 x = xfrm_find_acq_byseq(net, mark, p->info.seq); 1435 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) { 1436 xfrm_state_put(x); 1437 x = NULL; 1438 } 1439 } 1440 1441 if (!x) 1442 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid, 1443 if_id, p->info.id.proto, daddr, 1444 &p->info.saddr, 1, 1445 family); 1446 err = -ENOENT; 1447 if (x == NULL) 1448 goto out_noput; 1449 1450 err = xfrm_alloc_spi(x, p->min, p->max); 1451 if (err) 1452 goto out; 1453 1454 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 1455 if (IS_ERR(resp_skb)) { 1456 err = PTR_ERR(resp_skb); 1457 goto out; 1458 } 1459 1460 xtr = xfrm_get_translator(); 1461 if (xtr) { 1462 err = xtr->alloc_compat(skb, nlmsg_hdr(skb)); 1463 1464 xfrm_put_translator(xtr); 1465 if (err) { 1466 kfree_skb(resp_skb); 1467 goto out; 1468 } 1469 } 1470 1471 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); 1472 1473 out: 1474 xfrm_state_put(x); 1475 out_noput: 1476 return err; 1477 } 1478 1479 static int verify_policy_dir(u8 dir) 1480 { 1481 switch (dir) { 1482 case XFRM_POLICY_IN: 1483 case XFRM_POLICY_OUT: 1484 case XFRM_POLICY_FWD: 1485 break; 1486 1487 default: 1488 return -EINVAL; 1489 } 1490 1491 return 0; 1492 } 1493 1494 static int verify_policy_type(u8 type) 1495 { 1496 switch (type) { 1497 case XFRM_POLICY_TYPE_MAIN: 1498 #ifdef CONFIG_XFRM_SUB_POLICY 1499 case XFRM_POLICY_TYPE_SUB: 1500 #endif 1501 break; 1502 1503 default: 1504 return -EINVAL; 1505 } 1506 1507 return 0; 1508 } 1509 1510 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p) 1511 { 1512 int ret; 1513 1514 switch (p->share) { 1515 case XFRM_SHARE_ANY: 1516 case XFRM_SHARE_SESSION: 1517 case XFRM_SHARE_USER: 1518 case XFRM_SHARE_UNIQUE: 1519 break; 1520 1521 default: 1522 return -EINVAL; 1523 } 1524 1525 switch (p->action) { 1526 case XFRM_POLICY_ALLOW: 1527 case XFRM_POLICY_BLOCK: 1528 break; 1529 1530 default: 1531 return -EINVAL; 1532 } 1533 1534 switch (p->sel.family) { 1535 case AF_INET: 1536 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32) 1537 return -EINVAL; 1538 1539 break; 1540 1541 case AF_INET6: 1542 #if IS_ENABLED(CONFIG_IPV6) 1543 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128) 1544 return -EINVAL; 1545 1546 break; 1547 #else 1548 return -EAFNOSUPPORT; 1549 #endif 1550 1551 default: 1552 return -EINVAL; 1553 } 1554 1555 ret = verify_policy_dir(p->dir); 1556 if (ret) 1557 return ret; 1558 if (p->index && (xfrm_policy_id2dir(p->index) != p->dir)) 1559 return -EINVAL; 1560 1561 return 0; 1562 } 1563 1564 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs) 1565 { 1566 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1567 struct xfrm_user_sec_ctx *uctx; 1568 1569 if (!rt) 1570 return 0; 1571 1572 uctx = nla_data(rt); 1573 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL); 1574 } 1575 1576 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut, 1577 int nr) 1578 { 1579 int i; 1580 1581 xp->xfrm_nr = nr; 1582 for (i = 0; i < nr; i++, ut++) { 1583 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 1584 1585 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id)); 1586 memcpy(&t->saddr, &ut->saddr, 1587 sizeof(xfrm_address_t)); 1588 t->reqid = ut->reqid; 1589 t->mode = ut->mode; 1590 t->share = ut->share; 1591 t->optional = ut->optional; 1592 t->aalgos = ut->aalgos; 1593 t->ealgos = ut->ealgos; 1594 t->calgos = ut->calgos; 1595 /* If all masks are ~0, then we allow all algorithms. */ 1596 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos); 1597 t->encap_family = ut->family; 1598 } 1599 } 1600 1601 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family) 1602 { 1603 u16 prev_family; 1604 int i; 1605 1606 if (nr > XFRM_MAX_DEPTH) 1607 return -EINVAL; 1608 1609 prev_family = family; 1610 1611 for (i = 0; i < nr; i++) { 1612 /* We never validated the ut->family value, so many 1613 * applications simply leave it at zero. The check was 1614 * never made and ut->family was ignored because all 1615 * templates could be assumed to have the same family as 1616 * the policy itself. Now that we will have ipv4-in-ipv6 1617 * and ipv6-in-ipv4 tunnels, this is no longer true. 1618 */ 1619 if (!ut[i].family) 1620 ut[i].family = family; 1621 1622 switch (ut[i].mode) { 1623 case XFRM_MODE_TUNNEL: 1624 case XFRM_MODE_BEET: 1625 break; 1626 default: 1627 if (ut[i].family != prev_family) 1628 return -EINVAL; 1629 break; 1630 } 1631 if (ut[i].mode >= XFRM_MODE_MAX) 1632 return -EINVAL; 1633 1634 prev_family = ut[i].family; 1635 1636 switch (ut[i].family) { 1637 case AF_INET: 1638 break; 1639 #if IS_ENABLED(CONFIG_IPV6) 1640 case AF_INET6: 1641 break; 1642 #endif 1643 default: 1644 return -EINVAL; 1645 } 1646 1647 if (!xfrm_id_proto_valid(ut[i].id.proto)) 1648 return -EINVAL; 1649 } 1650 1651 return 0; 1652 } 1653 1654 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs) 1655 { 1656 struct nlattr *rt = attrs[XFRMA_TMPL]; 1657 1658 if (!rt) { 1659 pol->xfrm_nr = 0; 1660 } else { 1661 struct xfrm_user_tmpl *utmpl = nla_data(rt); 1662 int nr = nla_len(rt) / sizeof(*utmpl); 1663 int err; 1664 1665 err = validate_tmpl(nr, utmpl, pol->family); 1666 if (err) 1667 return err; 1668 1669 copy_templates(pol, utmpl, nr); 1670 } 1671 return 0; 1672 } 1673 1674 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs) 1675 { 1676 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE]; 1677 struct xfrm_userpolicy_type *upt; 1678 u8 type = XFRM_POLICY_TYPE_MAIN; 1679 int err; 1680 1681 if (rt) { 1682 upt = nla_data(rt); 1683 type = upt->type; 1684 } 1685 1686 err = verify_policy_type(type); 1687 if (err) 1688 return err; 1689 1690 *tp = type; 1691 return 0; 1692 } 1693 1694 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p) 1695 { 1696 xp->priority = p->priority; 1697 xp->index = p->index; 1698 memcpy(&xp->selector, &p->sel, sizeof(xp->selector)); 1699 memcpy(&xp->lft, &p->lft, sizeof(xp->lft)); 1700 xp->action = p->action; 1701 xp->flags = p->flags; 1702 xp->family = p->sel.family; 1703 /* XXX xp->share = p->share; */ 1704 } 1705 1706 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir) 1707 { 1708 memset(p, 0, sizeof(*p)); 1709 memcpy(&p->sel, &xp->selector, sizeof(p->sel)); 1710 memcpy(&p->lft, &xp->lft, sizeof(p->lft)); 1711 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft)); 1712 p->priority = xp->priority; 1713 p->index = xp->index; 1714 p->sel.family = xp->family; 1715 p->dir = dir; 1716 p->action = xp->action; 1717 p->flags = xp->flags; 1718 p->share = XFRM_SHARE_ANY; /* XXX xp->share */ 1719 } 1720 1721 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp) 1722 { 1723 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL); 1724 int err; 1725 1726 if (!xp) { 1727 *errp = -ENOMEM; 1728 return NULL; 1729 } 1730 1731 copy_from_user_policy(xp, p); 1732 1733 err = copy_from_user_policy_type(&xp->type, attrs); 1734 if (err) 1735 goto error; 1736 1737 if (!(err = copy_from_user_tmpl(xp, attrs))) 1738 err = copy_from_user_sec_ctx(xp, attrs); 1739 if (err) 1740 goto error; 1741 1742 xfrm_mark_get(attrs, &xp->mark); 1743 1744 if (attrs[XFRMA_IF_ID]) 1745 xp->if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 1746 1747 return xp; 1748 error: 1749 *errp = err; 1750 xp->walk.dead = 1; 1751 xfrm_policy_destroy(xp); 1752 return NULL; 1753 } 1754 1755 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1756 struct nlattr **attrs) 1757 { 1758 struct net *net = sock_net(skb->sk); 1759 struct xfrm_userpolicy_info *p = nlmsg_data(nlh); 1760 struct xfrm_policy *xp; 1761 struct km_event c; 1762 int err; 1763 int excl; 1764 1765 err = verify_newpolicy_info(p); 1766 if (err) 1767 return err; 1768 err = verify_sec_ctx_len(attrs); 1769 if (err) 1770 return err; 1771 1772 xp = xfrm_policy_construct(net, p, attrs, &err); 1773 if (!xp) 1774 return err; 1775 1776 /* shouldn't excl be based on nlh flags?? 1777 * Aha! this is anti-netlink really i.e more pfkey derived 1778 * in netlink excl is a flag and you wouldn't need 1779 * a type XFRM_MSG_UPDPOLICY - JHS */ 1780 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY; 1781 err = xfrm_policy_insert(p->dir, xp, excl); 1782 xfrm_audit_policy_add(xp, err ? 0 : 1, true); 1783 1784 if (err) { 1785 security_xfrm_policy_free(xp->security); 1786 kfree(xp); 1787 return err; 1788 } 1789 1790 c.event = nlh->nlmsg_type; 1791 c.seq = nlh->nlmsg_seq; 1792 c.portid = nlh->nlmsg_pid; 1793 km_policy_notify(xp, p->dir, &c); 1794 1795 xfrm_pol_put(xp); 1796 1797 return 0; 1798 } 1799 1800 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb) 1801 { 1802 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH]; 1803 int i; 1804 1805 if (xp->xfrm_nr == 0) 1806 return 0; 1807 1808 for (i = 0; i < xp->xfrm_nr; i++) { 1809 struct xfrm_user_tmpl *up = &vec[i]; 1810 struct xfrm_tmpl *kp = &xp->xfrm_vec[i]; 1811 1812 memset(up, 0, sizeof(*up)); 1813 memcpy(&up->id, &kp->id, sizeof(up->id)); 1814 up->family = kp->encap_family; 1815 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr)); 1816 up->reqid = kp->reqid; 1817 up->mode = kp->mode; 1818 up->share = kp->share; 1819 up->optional = kp->optional; 1820 up->aalgos = kp->aalgos; 1821 up->ealgos = kp->ealgos; 1822 up->calgos = kp->calgos; 1823 } 1824 1825 return nla_put(skb, XFRMA_TMPL, 1826 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec); 1827 } 1828 1829 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb) 1830 { 1831 if (x->security) { 1832 return copy_sec_ctx(x->security, skb); 1833 } 1834 return 0; 1835 } 1836 1837 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb) 1838 { 1839 if (xp->security) 1840 return copy_sec_ctx(xp->security, skb); 1841 return 0; 1842 } 1843 static inline unsigned int userpolicy_type_attrsize(void) 1844 { 1845 #ifdef CONFIG_XFRM_SUB_POLICY 1846 return nla_total_size(sizeof(struct xfrm_userpolicy_type)); 1847 #else 1848 return 0; 1849 #endif 1850 } 1851 1852 #ifdef CONFIG_XFRM_SUB_POLICY 1853 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1854 { 1855 struct xfrm_userpolicy_type upt; 1856 1857 /* Sadly there are two holes in struct xfrm_userpolicy_type */ 1858 memset(&upt, 0, sizeof(upt)); 1859 upt.type = type; 1860 1861 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt); 1862 } 1863 1864 #else 1865 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1866 { 1867 return 0; 1868 } 1869 #endif 1870 1871 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr) 1872 { 1873 struct xfrm_dump_info *sp = ptr; 1874 struct xfrm_userpolicy_info *p; 1875 struct sk_buff *in_skb = sp->in_skb; 1876 struct sk_buff *skb = sp->out_skb; 1877 struct xfrm_translator *xtr; 1878 struct nlmsghdr *nlh; 1879 int err; 1880 1881 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, 1882 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags); 1883 if (nlh == NULL) 1884 return -EMSGSIZE; 1885 1886 p = nlmsg_data(nlh); 1887 copy_to_user_policy(xp, p, dir); 1888 err = copy_to_user_tmpl(xp, skb); 1889 if (!err) 1890 err = copy_to_user_sec_ctx(xp, skb); 1891 if (!err) 1892 err = copy_to_user_policy_type(xp->type, skb); 1893 if (!err) 1894 err = xfrm_mark_put(skb, &xp->mark); 1895 if (!err) 1896 err = xfrm_if_id_put(skb, xp->if_id); 1897 if (err) { 1898 nlmsg_cancel(skb, nlh); 1899 return err; 1900 } 1901 nlmsg_end(skb, nlh); 1902 1903 xtr = xfrm_get_translator(); 1904 if (xtr) { 1905 err = xtr->alloc_compat(skb, nlh); 1906 1907 xfrm_put_translator(xtr); 1908 if (err) { 1909 nlmsg_cancel(skb, nlh); 1910 return err; 1911 } 1912 } 1913 1914 return 0; 1915 } 1916 1917 static int xfrm_dump_policy_done(struct netlink_callback *cb) 1918 { 1919 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args; 1920 struct net *net = sock_net(cb->skb->sk); 1921 1922 xfrm_policy_walk_done(walk, net); 1923 return 0; 1924 } 1925 1926 static int xfrm_dump_policy_start(struct netlink_callback *cb) 1927 { 1928 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args; 1929 1930 BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args)); 1931 1932 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY); 1933 return 0; 1934 } 1935 1936 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb) 1937 { 1938 struct net *net = sock_net(skb->sk); 1939 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args; 1940 struct xfrm_dump_info info; 1941 1942 info.in_skb = cb->skb; 1943 info.out_skb = skb; 1944 info.nlmsg_seq = cb->nlh->nlmsg_seq; 1945 info.nlmsg_flags = NLM_F_MULTI; 1946 1947 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info); 1948 1949 return skb->len; 1950 } 1951 1952 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb, 1953 struct xfrm_policy *xp, 1954 int dir, u32 seq) 1955 { 1956 struct xfrm_dump_info info; 1957 struct sk_buff *skb; 1958 int err; 1959 1960 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1961 if (!skb) 1962 return ERR_PTR(-ENOMEM); 1963 1964 info.in_skb = in_skb; 1965 info.out_skb = skb; 1966 info.nlmsg_seq = seq; 1967 info.nlmsg_flags = 0; 1968 1969 err = dump_one_policy(xp, dir, 0, &info); 1970 if (err) { 1971 kfree_skb(skb); 1972 return ERR_PTR(err); 1973 } 1974 1975 return skb; 1976 } 1977 1978 static int xfrm_notify_userpolicy(struct net *net) 1979 { 1980 struct xfrm_userpolicy_default *up; 1981 int len = NLMSG_ALIGN(sizeof(*up)); 1982 struct nlmsghdr *nlh; 1983 struct sk_buff *skb; 1984 int err; 1985 1986 skb = nlmsg_new(len, GFP_ATOMIC); 1987 if (skb == NULL) 1988 return -ENOMEM; 1989 1990 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_GETDEFAULT, sizeof(*up), 0); 1991 if (nlh == NULL) { 1992 kfree_skb(skb); 1993 return -EMSGSIZE; 1994 } 1995 1996 up = nlmsg_data(nlh); 1997 up->in = net->xfrm.policy_default[XFRM_POLICY_IN]; 1998 up->fwd = net->xfrm.policy_default[XFRM_POLICY_FWD]; 1999 up->out = net->xfrm.policy_default[XFRM_POLICY_OUT]; 2000 2001 nlmsg_end(skb, nlh); 2002 2003 rcu_read_lock(); 2004 err = xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 2005 rcu_read_unlock(); 2006 2007 return err; 2008 } 2009 2010 static bool xfrm_userpolicy_is_valid(__u8 policy) 2011 { 2012 return policy == XFRM_USERPOLICY_BLOCK || 2013 policy == XFRM_USERPOLICY_ACCEPT; 2014 } 2015 2016 static int xfrm_set_default(struct sk_buff *skb, struct nlmsghdr *nlh, 2017 struct nlattr **attrs) 2018 { 2019 struct net *net = sock_net(skb->sk); 2020 struct xfrm_userpolicy_default *up = nlmsg_data(nlh); 2021 2022 if (xfrm_userpolicy_is_valid(up->in)) 2023 net->xfrm.policy_default[XFRM_POLICY_IN] = up->in; 2024 2025 if (xfrm_userpolicy_is_valid(up->fwd)) 2026 net->xfrm.policy_default[XFRM_POLICY_FWD] = up->fwd; 2027 2028 if (xfrm_userpolicy_is_valid(up->out)) 2029 net->xfrm.policy_default[XFRM_POLICY_OUT] = up->out; 2030 2031 rt_genid_bump_all(net); 2032 2033 xfrm_notify_userpolicy(net); 2034 return 0; 2035 } 2036 2037 static int xfrm_get_default(struct sk_buff *skb, struct nlmsghdr *nlh, 2038 struct nlattr **attrs) 2039 { 2040 struct sk_buff *r_skb; 2041 struct nlmsghdr *r_nlh; 2042 struct net *net = sock_net(skb->sk); 2043 struct xfrm_userpolicy_default *r_up; 2044 int len = NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_default)); 2045 u32 portid = NETLINK_CB(skb).portid; 2046 u32 seq = nlh->nlmsg_seq; 2047 2048 r_skb = nlmsg_new(len, GFP_ATOMIC); 2049 if (!r_skb) 2050 return -ENOMEM; 2051 2052 r_nlh = nlmsg_put(r_skb, portid, seq, XFRM_MSG_GETDEFAULT, sizeof(*r_up), 0); 2053 if (!r_nlh) { 2054 kfree_skb(r_skb); 2055 return -EMSGSIZE; 2056 } 2057 2058 r_up = nlmsg_data(r_nlh); 2059 r_up->in = net->xfrm.policy_default[XFRM_POLICY_IN]; 2060 r_up->fwd = net->xfrm.policy_default[XFRM_POLICY_FWD]; 2061 r_up->out = net->xfrm.policy_default[XFRM_POLICY_OUT]; 2062 nlmsg_end(r_skb, r_nlh); 2063 2064 return nlmsg_unicast(net->xfrm.nlsk, r_skb, portid); 2065 } 2066 2067 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 2068 struct nlattr **attrs) 2069 { 2070 struct net *net = sock_net(skb->sk); 2071 struct xfrm_policy *xp; 2072 struct xfrm_userpolicy_id *p; 2073 u8 type = XFRM_POLICY_TYPE_MAIN; 2074 int err; 2075 struct km_event c; 2076 int delete; 2077 struct xfrm_mark m; 2078 u32 if_id = 0; 2079 2080 p = nlmsg_data(nlh); 2081 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY; 2082 2083 err = copy_from_user_policy_type(&type, attrs); 2084 if (err) 2085 return err; 2086 2087 err = verify_policy_dir(p->dir); 2088 if (err) 2089 return err; 2090 2091 if (attrs[XFRMA_IF_ID]) 2092 if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 2093 2094 xfrm_mark_get(attrs, &m); 2095 2096 if (p->index) 2097 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir, 2098 p->index, delete, &err); 2099 else { 2100 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 2101 struct xfrm_sec_ctx *ctx; 2102 2103 err = verify_sec_ctx_len(attrs); 2104 if (err) 2105 return err; 2106 2107 ctx = NULL; 2108 if (rt) { 2109 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 2110 2111 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); 2112 if (err) 2113 return err; 2114 } 2115 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir, 2116 &p->sel, ctx, delete, &err); 2117 security_xfrm_policy_free(ctx); 2118 } 2119 if (xp == NULL) 2120 return -ENOENT; 2121 2122 if (!delete) { 2123 struct sk_buff *resp_skb; 2124 2125 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq); 2126 if (IS_ERR(resp_skb)) { 2127 err = PTR_ERR(resp_skb); 2128 } else { 2129 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, 2130 NETLINK_CB(skb).portid); 2131 } 2132 } else { 2133 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 2134 2135 if (err != 0) 2136 goto out; 2137 2138 c.data.byid = p->index; 2139 c.event = nlh->nlmsg_type; 2140 c.seq = nlh->nlmsg_seq; 2141 c.portid = nlh->nlmsg_pid; 2142 km_policy_notify(xp, p->dir, &c); 2143 } 2144 2145 out: 2146 xfrm_pol_put(xp); 2147 return err; 2148 } 2149 2150 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 2151 struct nlattr **attrs) 2152 { 2153 struct net *net = sock_net(skb->sk); 2154 struct km_event c; 2155 struct xfrm_usersa_flush *p = nlmsg_data(nlh); 2156 int err; 2157 2158 err = xfrm_state_flush(net, p->proto, true, false); 2159 if (err) { 2160 if (err == -ESRCH) /* empty table */ 2161 return 0; 2162 return err; 2163 } 2164 c.data.proto = p->proto; 2165 c.event = nlh->nlmsg_type; 2166 c.seq = nlh->nlmsg_seq; 2167 c.portid = nlh->nlmsg_pid; 2168 c.net = net; 2169 km_state_notify(NULL, &c); 2170 2171 return 0; 2172 } 2173 2174 static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x) 2175 { 2176 unsigned int replay_size = x->replay_esn ? 2177 xfrm_replay_state_esn_len(x->replay_esn) : 2178 sizeof(struct xfrm_replay_state); 2179 2180 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id)) 2181 + nla_total_size(replay_size) 2182 + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur)) 2183 + nla_total_size(sizeof(struct xfrm_mark)) 2184 + nla_total_size(4) /* XFRM_AE_RTHR */ 2185 + nla_total_size(4); /* XFRM_AE_ETHR */ 2186 } 2187 2188 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 2189 { 2190 struct xfrm_aevent_id *id; 2191 struct nlmsghdr *nlh; 2192 int err; 2193 2194 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0); 2195 if (nlh == NULL) 2196 return -EMSGSIZE; 2197 2198 id = nlmsg_data(nlh); 2199 memset(&id->sa_id, 0, sizeof(id->sa_id)); 2200 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr)); 2201 id->sa_id.spi = x->id.spi; 2202 id->sa_id.family = x->props.family; 2203 id->sa_id.proto = x->id.proto; 2204 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr)); 2205 id->reqid = x->props.reqid; 2206 id->flags = c->data.aevent; 2207 2208 if (x->replay_esn) { 2209 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL, 2210 xfrm_replay_state_esn_len(x->replay_esn), 2211 x->replay_esn); 2212 } else { 2213 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), 2214 &x->replay); 2215 } 2216 if (err) 2217 goto out_cancel; 2218 err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft, 2219 XFRMA_PAD); 2220 if (err) 2221 goto out_cancel; 2222 2223 if (id->flags & XFRM_AE_RTHR) { 2224 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff); 2225 if (err) 2226 goto out_cancel; 2227 } 2228 if (id->flags & XFRM_AE_ETHR) { 2229 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH, 2230 x->replay_maxage * 10 / HZ); 2231 if (err) 2232 goto out_cancel; 2233 } 2234 err = xfrm_mark_put(skb, &x->mark); 2235 if (err) 2236 goto out_cancel; 2237 2238 err = xfrm_if_id_put(skb, x->if_id); 2239 if (err) 2240 goto out_cancel; 2241 2242 nlmsg_end(skb, nlh); 2243 return 0; 2244 2245 out_cancel: 2246 nlmsg_cancel(skb, nlh); 2247 return err; 2248 } 2249 2250 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 2251 struct nlattr **attrs) 2252 { 2253 struct net *net = sock_net(skb->sk); 2254 struct xfrm_state *x; 2255 struct sk_buff *r_skb; 2256 int err; 2257 struct km_event c; 2258 u32 mark; 2259 struct xfrm_mark m; 2260 struct xfrm_aevent_id *p = nlmsg_data(nlh); 2261 struct xfrm_usersa_id *id = &p->sa_id; 2262 2263 mark = xfrm_mark_get(attrs, &m); 2264 2265 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family); 2266 if (x == NULL) 2267 return -ESRCH; 2268 2269 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 2270 if (r_skb == NULL) { 2271 xfrm_state_put(x); 2272 return -ENOMEM; 2273 } 2274 2275 /* 2276 * XXX: is this lock really needed - none of the other 2277 * gets lock (the concern is things getting updated 2278 * while we are still reading) - jhs 2279 */ 2280 spin_lock_bh(&x->lock); 2281 c.data.aevent = p->flags; 2282 c.seq = nlh->nlmsg_seq; 2283 c.portid = nlh->nlmsg_pid; 2284 2285 err = build_aevent(r_skb, x, &c); 2286 BUG_ON(err < 0); 2287 2288 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid); 2289 spin_unlock_bh(&x->lock); 2290 xfrm_state_put(x); 2291 return err; 2292 } 2293 2294 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 2295 struct nlattr **attrs) 2296 { 2297 struct net *net = sock_net(skb->sk); 2298 struct xfrm_state *x; 2299 struct km_event c; 2300 int err = -EINVAL; 2301 u32 mark = 0; 2302 struct xfrm_mark m; 2303 struct xfrm_aevent_id *p = nlmsg_data(nlh); 2304 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 2305 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL]; 2306 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 2307 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; 2308 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; 2309 2310 if (!lt && !rp && !re && !et && !rt) 2311 return err; 2312 2313 /* pedantic mode - thou shalt sayeth replaceth */ 2314 if (!(nlh->nlmsg_flags&NLM_F_REPLACE)) 2315 return err; 2316 2317 mark = xfrm_mark_get(attrs, &m); 2318 2319 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family); 2320 if (x == NULL) 2321 return -ESRCH; 2322 2323 if (x->km.state != XFRM_STATE_VALID) 2324 goto out; 2325 2326 err = xfrm_replay_verify_len(x->replay_esn, re); 2327 if (err) 2328 goto out; 2329 2330 spin_lock_bh(&x->lock); 2331 xfrm_update_ae_params(x, attrs, 1); 2332 spin_unlock_bh(&x->lock); 2333 2334 c.event = nlh->nlmsg_type; 2335 c.seq = nlh->nlmsg_seq; 2336 c.portid = nlh->nlmsg_pid; 2337 c.data.aevent = XFRM_AE_CU; 2338 km_state_notify(x, &c); 2339 err = 0; 2340 out: 2341 xfrm_state_put(x); 2342 return err; 2343 } 2344 2345 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 2346 struct nlattr **attrs) 2347 { 2348 struct net *net = sock_net(skb->sk); 2349 struct km_event c; 2350 u8 type = XFRM_POLICY_TYPE_MAIN; 2351 int err; 2352 2353 err = copy_from_user_policy_type(&type, attrs); 2354 if (err) 2355 return err; 2356 2357 err = xfrm_policy_flush(net, type, true); 2358 if (err) { 2359 if (err == -ESRCH) /* empty table */ 2360 return 0; 2361 return err; 2362 } 2363 2364 c.data.type = type; 2365 c.event = nlh->nlmsg_type; 2366 c.seq = nlh->nlmsg_seq; 2367 c.portid = nlh->nlmsg_pid; 2368 c.net = net; 2369 km_policy_notify(NULL, 0, &c); 2370 return 0; 2371 } 2372 2373 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 2374 struct nlattr **attrs) 2375 { 2376 struct net *net = sock_net(skb->sk); 2377 struct xfrm_policy *xp; 2378 struct xfrm_user_polexpire *up = nlmsg_data(nlh); 2379 struct xfrm_userpolicy_info *p = &up->pol; 2380 u8 type = XFRM_POLICY_TYPE_MAIN; 2381 int err = -ENOENT; 2382 struct xfrm_mark m; 2383 u32 if_id = 0; 2384 2385 err = copy_from_user_policy_type(&type, attrs); 2386 if (err) 2387 return err; 2388 2389 err = verify_policy_dir(p->dir); 2390 if (err) 2391 return err; 2392 2393 if (attrs[XFRMA_IF_ID]) 2394 if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 2395 2396 xfrm_mark_get(attrs, &m); 2397 2398 if (p->index) 2399 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir, p->index, 2400 0, &err); 2401 else { 2402 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 2403 struct xfrm_sec_ctx *ctx; 2404 2405 err = verify_sec_ctx_len(attrs); 2406 if (err) 2407 return err; 2408 2409 ctx = NULL; 2410 if (rt) { 2411 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 2412 2413 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); 2414 if (err) 2415 return err; 2416 } 2417 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir, 2418 &p->sel, ctx, 0, &err); 2419 security_xfrm_policy_free(ctx); 2420 } 2421 if (xp == NULL) 2422 return -ENOENT; 2423 2424 if (unlikely(xp->walk.dead)) 2425 goto out; 2426 2427 err = 0; 2428 if (up->hard) { 2429 xfrm_policy_delete(xp, p->dir); 2430 xfrm_audit_policy_delete(xp, 1, true); 2431 } 2432 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid); 2433 2434 out: 2435 xfrm_pol_put(xp); 2436 return err; 2437 } 2438 2439 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 2440 struct nlattr **attrs) 2441 { 2442 struct net *net = sock_net(skb->sk); 2443 struct xfrm_state *x; 2444 int err; 2445 struct xfrm_user_expire *ue = nlmsg_data(nlh); 2446 struct xfrm_usersa_info *p = &ue->state; 2447 struct xfrm_mark m; 2448 u32 mark = xfrm_mark_get(attrs, &m); 2449 2450 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family); 2451 2452 err = -ENOENT; 2453 if (x == NULL) 2454 return err; 2455 2456 spin_lock_bh(&x->lock); 2457 err = -EINVAL; 2458 if (x->km.state != XFRM_STATE_VALID) 2459 goto out; 2460 km_state_expired(x, ue->hard, nlh->nlmsg_pid); 2461 2462 if (ue->hard) { 2463 __xfrm_state_delete(x); 2464 xfrm_audit_state_delete(x, 1, true); 2465 } 2466 err = 0; 2467 out: 2468 spin_unlock_bh(&x->lock); 2469 xfrm_state_put(x); 2470 return err; 2471 } 2472 2473 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, 2474 struct nlattr **attrs) 2475 { 2476 struct net *net = sock_net(skb->sk); 2477 struct xfrm_policy *xp; 2478 struct xfrm_user_tmpl *ut; 2479 int i; 2480 struct nlattr *rt = attrs[XFRMA_TMPL]; 2481 struct xfrm_mark mark; 2482 2483 struct xfrm_user_acquire *ua = nlmsg_data(nlh); 2484 struct xfrm_state *x = xfrm_state_alloc(net); 2485 int err = -ENOMEM; 2486 2487 if (!x) 2488 goto nomem; 2489 2490 xfrm_mark_get(attrs, &mark); 2491 2492 err = verify_newpolicy_info(&ua->policy); 2493 if (err) 2494 goto free_state; 2495 err = verify_sec_ctx_len(attrs); 2496 if (err) 2497 goto free_state; 2498 2499 /* build an XP */ 2500 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err); 2501 if (!xp) 2502 goto free_state; 2503 2504 memcpy(&x->id, &ua->id, sizeof(ua->id)); 2505 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr)); 2506 memcpy(&x->sel, &ua->sel, sizeof(ua->sel)); 2507 xp->mark.m = x->mark.m = mark.m; 2508 xp->mark.v = x->mark.v = mark.v; 2509 ut = nla_data(rt); 2510 /* extract the templates and for each call km_key */ 2511 for (i = 0; i < xp->xfrm_nr; i++, ut++) { 2512 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 2513 memcpy(&x->id, &t->id, sizeof(x->id)); 2514 x->props.mode = t->mode; 2515 x->props.reqid = t->reqid; 2516 x->props.family = ut->family; 2517 t->aalgos = ua->aalgos; 2518 t->ealgos = ua->ealgos; 2519 t->calgos = ua->calgos; 2520 err = km_query(x, t, xp); 2521 2522 } 2523 2524 xfrm_state_free(x); 2525 kfree(xp); 2526 2527 return 0; 2528 2529 free_state: 2530 xfrm_state_free(x); 2531 nomem: 2532 return err; 2533 } 2534 2535 #ifdef CONFIG_XFRM_MIGRATE 2536 static int copy_from_user_migrate(struct xfrm_migrate *ma, 2537 struct xfrm_kmaddress *k, 2538 struct nlattr **attrs, int *num) 2539 { 2540 struct nlattr *rt = attrs[XFRMA_MIGRATE]; 2541 struct xfrm_user_migrate *um; 2542 int i, num_migrate; 2543 2544 if (k != NULL) { 2545 struct xfrm_user_kmaddress *uk; 2546 2547 uk = nla_data(attrs[XFRMA_KMADDRESS]); 2548 memcpy(&k->local, &uk->local, sizeof(k->local)); 2549 memcpy(&k->remote, &uk->remote, sizeof(k->remote)); 2550 k->family = uk->family; 2551 k->reserved = uk->reserved; 2552 } 2553 2554 um = nla_data(rt); 2555 num_migrate = nla_len(rt) / sizeof(*um); 2556 2557 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH) 2558 return -EINVAL; 2559 2560 for (i = 0; i < num_migrate; i++, um++, ma++) { 2561 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr)); 2562 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr)); 2563 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr)); 2564 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr)); 2565 2566 ma->proto = um->proto; 2567 ma->mode = um->mode; 2568 ma->reqid = um->reqid; 2569 2570 ma->old_family = um->old_family; 2571 ma->new_family = um->new_family; 2572 } 2573 2574 *num = i; 2575 return 0; 2576 } 2577 2578 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 2579 struct nlattr **attrs) 2580 { 2581 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh); 2582 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 2583 struct xfrm_kmaddress km, *kmp; 2584 u8 type; 2585 int err; 2586 int n = 0; 2587 struct net *net = sock_net(skb->sk); 2588 struct xfrm_encap_tmpl *encap = NULL; 2589 u32 if_id = 0; 2590 2591 if (attrs[XFRMA_MIGRATE] == NULL) 2592 return -EINVAL; 2593 2594 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL; 2595 2596 err = copy_from_user_policy_type(&type, attrs); 2597 if (err) 2598 return err; 2599 2600 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n); 2601 if (err) 2602 return err; 2603 2604 if (!n) 2605 return 0; 2606 2607 if (attrs[XFRMA_ENCAP]) { 2608 encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]), 2609 sizeof(*encap), GFP_KERNEL); 2610 if (!encap) 2611 return -ENOMEM; 2612 } 2613 2614 if (attrs[XFRMA_IF_ID]) 2615 if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 2616 2617 err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap, if_id); 2618 2619 kfree(encap); 2620 2621 return err; 2622 } 2623 #else 2624 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 2625 struct nlattr **attrs) 2626 { 2627 return -ENOPROTOOPT; 2628 } 2629 #endif 2630 2631 #ifdef CONFIG_XFRM_MIGRATE 2632 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb) 2633 { 2634 struct xfrm_user_migrate um; 2635 2636 memset(&um, 0, sizeof(um)); 2637 um.proto = m->proto; 2638 um.mode = m->mode; 2639 um.reqid = m->reqid; 2640 um.old_family = m->old_family; 2641 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr)); 2642 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr)); 2643 um.new_family = m->new_family; 2644 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr)); 2645 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr)); 2646 2647 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um); 2648 } 2649 2650 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb) 2651 { 2652 struct xfrm_user_kmaddress uk; 2653 2654 memset(&uk, 0, sizeof(uk)); 2655 uk.family = k->family; 2656 uk.reserved = k->reserved; 2657 memcpy(&uk.local, &k->local, sizeof(uk.local)); 2658 memcpy(&uk.remote, &k->remote, sizeof(uk.remote)); 2659 2660 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk); 2661 } 2662 2663 static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma, 2664 int with_encp) 2665 { 2666 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id)) 2667 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0) 2668 + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0) 2669 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate) 2670 + userpolicy_type_attrsize(); 2671 } 2672 2673 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m, 2674 int num_migrate, const struct xfrm_kmaddress *k, 2675 const struct xfrm_selector *sel, 2676 const struct xfrm_encap_tmpl *encap, u8 dir, u8 type) 2677 { 2678 const struct xfrm_migrate *mp; 2679 struct xfrm_userpolicy_id *pol_id; 2680 struct nlmsghdr *nlh; 2681 int i, err; 2682 2683 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0); 2684 if (nlh == NULL) 2685 return -EMSGSIZE; 2686 2687 pol_id = nlmsg_data(nlh); 2688 /* copy data from selector, dir, and type to the pol_id */ 2689 memset(pol_id, 0, sizeof(*pol_id)); 2690 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel)); 2691 pol_id->dir = dir; 2692 2693 if (k != NULL) { 2694 err = copy_to_user_kmaddress(k, skb); 2695 if (err) 2696 goto out_cancel; 2697 } 2698 if (encap) { 2699 err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap); 2700 if (err) 2701 goto out_cancel; 2702 } 2703 err = copy_to_user_policy_type(type, skb); 2704 if (err) 2705 goto out_cancel; 2706 for (i = 0, mp = m ; i < num_migrate; i++, mp++) { 2707 err = copy_to_user_migrate(mp, skb); 2708 if (err) 2709 goto out_cancel; 2710 } 2711 2712 nlmsg_end(skb, nlh); 2713 return 0; 2714 2715 out_cancel: 2716 nlmsg_cancel(skb, nlh); 2717 return err; 2718 } 2719 2720 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2721 const struct xfrm_migrate *m, int num_migrate, 2722 const struct xfrm_kmaddress *k, 2723 const struct xfrm_encap_tmpl *encap) 2724 { 2725 struct net *net = &init_net; 2726 struct sk_buff *skb; 2727 int err; 2728 2729 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap), 2730 GFP_ATOMIC); 2731 if (skb == NULL) 2732 return -ENOMEM; 2733 2734 /* build migrate */ 2735 err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type); 2736 BUG_ON(err < 0); 2737 2738 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE); 2739 } 2740 #else 2741 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2742 const struct xfrm_migrate *m, int num_migrate, 2743 const struct xfrm_kmaddress *k, 2744 const struct xfrm_encap_tmpl *encap) 2745 { 2746 return -ENOPROTOOPT; 2747 } 2748 #endif 2749 2750 #define XMSGSIZE(type) sizeof(struct type) 2751 2752 const int xfrm_msg_min[XFRM_NR_MSGTYPES] = { 2753 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2754 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2755 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2756 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2757 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2758 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2759 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info), 2760 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire), 2761 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire), 2762 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2763 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2764 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire), 2765 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush), 2766 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0, 2767 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2768 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2769 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report), 2770 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2771 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32), 2772 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 2773 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 2774 [XFRM_MSG_SETDEFAULT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default), 2775 [XFRM_MSG_GETDEFAULT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default), 2776 }; 2777 EXPORT_SYMBOL_GPL(xfrm_msg_min); 2778 2779 #undef XMSGSIZE 2780 2781 const struct nla_policy xfrma_policy[XFRMA_MAX+1] = { 2782 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)}, 2783 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)}, 2784 [XFRMA_LASTUSED] = { .type = NLA_U64}, 2785 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)}, 2786 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) }, 2787 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) }, 2788 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) }, 2789 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) }, 2790 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) }, 2791 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) }, 2792 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) }, 2793 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) }, 2794 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) }, 2795 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 }, 2796 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 }, 2797 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) }, 2798 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) }, 2799 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)}, 2800 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) }, 2801 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) }, 2802 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) }, 2803 [XFRMA_TFCPAD] = { .type = NLA_U32 }, 2804 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) }, 2805 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 }, 2806 [XFRMA_PROTO] = { .type = NLA_U8 }, 2807 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) }, 2808 [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) }, 2809 [XFRMA_SET_MARK] = { .type = NLA_U32 }, 2810 [XFRMA_SET_MARK_MASK] = { .type = NLA_U32 }, 2811 [XFRMA_IF_ID] = { .type = NLA_U32 }, 2812 }; 2813 EXPORT_SYMBOL_GPL(xfrma_policy); 2814 2815 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = { 2816 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) }, 2817 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) }, 2818 }; 2819 2820 static const struct xfrm_link { 2821 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **); 2822 int (*start)(struct netlink_callback *); 2823 int (*dump)(struct sk_buff *, struct netlink_callback *); 2824 int (*done)(struct netlink_callback *); 2825 const struct nla_policy *nla_pol; 2826 int nla_max; 2827 } xfrm_dispatch[XFRM_NR_MSGTYPES] = { 2828 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 2829 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa }, 2830 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa, 2831 .dump = xfrm_dump_sa, 2832 .done = xfrm_dump_sa_done }, 2833 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 2834 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy }, 2835 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy, 2836 .start = xfrm_dump_policy_start, 2837 .dump = xfrm_dump_policy, 2838 .done = xfrm_dump_policy_done }, 2839 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi }, 2840 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire }, 2841 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire }, 2842 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 2843 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 2844 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire}, 2845 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa }, 2846 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy }, 2847 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae }, 2848 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae }, 2849 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate }, 2850 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo }, 2851 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo, 2852 .nla_pol = xfrma_spd_policy, 2853 .nla_max = XFRMA_SPD_MAX }, 2854 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo }, 2855 [XFRM_MSG_SETDEFAULT - XFRM_MSG_BASE] = { .doit = xfrm_set_default }, 2856 [XFRM_MSG_GETDEFAULT - XFRM_MSG_BASE] = { .doit = xfrm_get_default }, 2857 }; 2858 2859 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, 2860 struct netlink_ext_ack *extack) 2861 { 2862 struct net *net = sock_net(skb->sk); 2863 struct nlattr *attrs[XFRMA_MAX+1]; 2864 const struct xfrm_link *link; 2865 struct nlmsghdr *nlh64 = NULL; 2866 int type, err; 2867 2868 type = nlh->nlmsg_type; 2869 if (type > XFRM_MSG_MAX) 2870 return -EINVAL; 2871 2872 type -= XFRM_MSG_BASE; 2873 link = &xfrm_dispatch[type]; 2874 2875 /* All operations require privileges, even GET */ 2876 if (!netlink_net_capable(skb, CAP_NET_ADMIN)) 2877 return -EPERM; 2878 2879 if (in_compat_syscall()) { 2880 struct xfrm_translator *xtr = xfrm_get_translator(); 2881 2882 if (!xtr) 2883 return -EOPNOTSUPP; 2884 2885 nlh64 = xtr->rcv_msg_compat(nlh, link->nla_max, 2886 link->nla_pol, extack); 2887 xfrm_put_translator(xtr); 2888 if (IS_ERR(nlh64)) 2889 return PTR_ERR(nlh64); 2890 if (nlh64) 2891 nlh = nlh64; 2892 } 2893 2894 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) || 2895 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) && 2896 (nlh->nlmsg_flags & NLM_F_DUMP)) { 2897 struct netlink_dump_control c = { 2898 .start = link->start, 2899 .dump = link->dump, 2900 .done = link->done, 2901 }; 2902 2903 if (link->dump == NULL) { 2904 err = -EINVAL; 2905 goto err; 2906 } 2907 2908 err = netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c); 2909 goto err; 2910 } 2911 2912 err = nlmsg_parse_deprecated(nlh, xfrm_msg_min[type], attrs, 2913 link->nla_max ? : XFRMA_MAX, 2914 link->nla_pol ? : xfrma_policy, extack); 2915 if (err < 0) 2916 goto err; 2917 2918 if (link->doit == NULL) { 2919 err = -EINVAL; 2920 goto err; 2921 } 2922 2923 err = link->doit(skb, nlh, attrs); 2924 2925 /* We need to free skb allocated in xfrm_alloc_compat() before 2926 * returning from this function, because consume_skb() won't take 2927 * care of frag_list since netlink destructor sets 2928 * sbk->head to NULL. (see netlink_skb_destructor()) 2929 */ 2930 if (skb_has_frag_list(skb)) { 2931 kfree_skb(skb_shinfo(skb)->frag_list); 2932 skb_shinfo(skb)->frag_list = NULL; 2933 } 2934 2935 err: 2936 kvfree(nlh64); 2937 return err; 2938 } 2939 2940 static void xfrm_netlink_rcv(struct sk_buff *skb) 2941 { 2942 struct net *net = sock_net(skb->sk); 2943 2944 mutex_lock(&net->xfrm.xfrm_cfg_mutex); 2945 netlink_rcv_skb(skb, &xfrm_user_rcv_msg); 2946 mutex_unlock(&net->xfrm.xfrm_cfg_mutex); 2947 } 2948 2949 static inline unsigned int xfrm_expire_msgsize(void) 2950 { 2951 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire)) 2952 + nla_total_size(sizeof(struct xfrm_mark)); 2953 } 2954 2955 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 2956 { 2957 struct xfrm_user_expire *ue; 2958 struct nlmsghdr *nlh; 2959 int err; 2960 2961 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0); 2962 if (nlh == NULL) 2963 return -EMSGSIZE; 2964 2965 ue = nlmsg_data(nlh); 2966 copy_to_user_state(x, &ue->state); 2967 ue->hard = (c->data.hard != 0) ? 1 : 0; 2968 /* clear the padding bytes */ 2969 memset_after(ue, 0, hard); 2970 2971 err = xfrm_mark_put(skb, &x->mark); 2972 if (err) 2973 return err; 2974 2975 err = xfrm_if_id_put(skb, x->if_id); 2976 if (err) 2977 return err; 2978 2979 nlmsg_end(skb, nlh); 2980 return 0; 2981 } 2982 2983 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c) 2984 { 2985 struct net *net = xs_net(x); 2986 struct sk_buff *skb; 2987 2988 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC); 2989 if (skb == NULL) 2990 return -ENOMEM; 2991 2992 if (build_expire(skb, x, c) < 0) { 2993 kfree_skb(skb); 2994 return -EMSGSIZE; 2995 } 2996 2997 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE); 2998 } 2999 3000 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c) 3001 { 3002 struct net *net = xs_net(x); 3003 struct sk_buff *skb; 3004 int err; 3005 3006 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 3007 if (skb == NULL) 3008 return -ENOMEM; 3009 3010 err = build_aevent(skb, x, c); 3011 BUG_ON(err < 0); 3012 3013 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS); 3014 } 3015 3016 static int xfrm_notify_sa_flush(const struct km_event *c) 3017 { 3018 struct net *net = c->net; 3019 struct xfrm_usersa_flush *p; 3020 struct nlmsghdr *nlh; 3021 struct sk_buff *skb; 3022 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush)); 3023 3024 skb = nlmsg_new(len, GFP_ATOMIC); 3025 if (skb == NULL) 3026 return -ENOMEM; 3027 3028 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0); 3029 if (nlh == NULL) { 3030 kfree_skb(skb); 3031 return -EMSGSIZE; 3032 } 3033 3034 p = nlmsg_data(nlh); 3035 p->proto = c->data.proto; 3036 3037 nlmsg_end(skb, nlh); 3038 3039 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA); 3040 } 3041 3042 static inline unsigned int xfrm_sa_len(struct xfrm_state *x) 3043 { 3044 unsigned int l = 0; 3045 if (x->aead) 3046 l += nla_total_size(aead_len(x->aead)); 3047 if (x->aalg) { 3048 l += nla_total_size(sizeof(struct xfrm_algo) + 3049 (x->aalg->alg_key_len + 7) / 8); 3050 l += nla_total_size(xfrm_alg_auth_len(x->aalg)); 3051 } 3052 if (x->ealg) 3053 l += nla_total_size(xfrm_alg_len(x->ealg)); 3054 if (x->calg) 3055 l += nla_total_size(sizeof(*x->calg)); 3056 if (x->encap) 3057 l += nla_total_size(sizeof(*x->encap)); 3058 if (x->tfcpad) 3059 l += nla_total_size(sizeof(x->tfcpad)); 3060 if (x->replay_esn) 3061 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn)); 3062 else 3063 l += nla_total_size(sizeof(struct xfrm_replay_state)); 3064 if (x->security) 3065 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) + 3066 x->security->ctx_len); 3067 if (x->coaddr) 3068 l += nla_total_size(sizeof(*x->coaddr)); 3069 if (x->props.extra_flags) 3070 l += nla_total_size(sizeof(x->props.extra_flags)); 3071 if (x->xso.dev) 3072 l += nla_total_size(sizeof(struct xfrm_user_offload)); 3073 if (x->props.smark.v | x->props.smark.m) { 3074 l += nla_total_size(sizeof(x->props.smark.v)); 3075 l += nla_total_size(sizeof(x->props.smark.m)); 3076 } 3077 if (x->if_id) 3078 l += nla_total_size(sizeof(x->if_id)); 3079 3080 /* Must count x->lastused as it may become non-zero behind our back. */ 3081 l += nla_total_size_64bit(sizeof(u64)); 3082 3083 if (x->mapping_maxage) 3084 l += nla_total_size(sizeof(x->mapping_maxage)); 3085 3086 return l; 3087 } 3088 3089 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c) 3090 { 3091 struct net *net = xs_net(x); 3092 struct xfrm_usersa_info *p; 3093 struct xfrm_usersa_id *id; 3094 struct nlmsghdr *nlh; 3095 struct sk_buff *skb; 3096 unsigned int len = xfrm_sa_len(x); 3097 unsigned int headlen; 3098 int err; 3099 3100 headlen = sizeof(*p); 3101 if (c->event == XFRM_MSG_DELSA) { 3102 len += nla_total_size(headlen); 3103 headlen = sizeof(*id); 3104 len += nla_total_size(sizeof(struct xfrm_mark)); 3105 } 3106 len += NLMSG_ALIGN(headlen); 3107 3108 skb = nlmsg_new(len, GFP_ATOMIC); 3109 if (skb == NULL) 3110 return -ENOMEM; 3111 3112 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); 3113 err = -EMSGSIZE; 3114 if (nlh == NULL) 3115 goto out_free_skb; 3116 3117 p = nlmsg_data(nlh); 3118 if (c->event == XFRM_MSG_DELSA) { 3119 struct nlattr *attr; 3120 3121 id = nlmsg_data(nlh); 3122 memset(id, 0, sizeof(*id)); 3123 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr)); 3124 id->spi = x->id.spi; 3125 id->family = x->props.family; 3126 id->proto = x->id.proto; 3127 3128 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p)); 3129 err = -EMSGSIZE; 3130 if (attr == NULL) 3131 goto out_free_skb; 3132 3133 p = nla_data(attr); 3134 } 3135 err = copy_to_user_state_extra(x, p, skb); 3136 if (err) 3137 goto out_free_skb; 3138 3139 nlmsg_end(skb, nlh); 3140 3141 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA); 3142 3143 out_free_skb: 3144 kfree_skb(skb); 3145 return err; 3146 } 3147 3148 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c) 3149 { 3150 3151 switch (c->event) { 3152 case XFRM_MSG_EXPIRE: 3153 return xfrm_exp_state_notify(x, c); 3154 case XFRM_MSG_NEWAE: 3155 return xfrm_aevent_state_notify(x, c); 3156 case XFRM_MSG_DELSA: 3157 case XFRM_MSG_UPDSA: 3158 case XFRM_MSG_NEWSA: 3159 return xfrm_notify_sa(x, c); 3160 case XFRM_MSG_FLUSHSA: 3161 return xfrm_notify_sa_flush(c); 3162 default: 3163 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n", 3164 c->event); 3165 break; 3166 } 3167 3168 return 0; 3169 3170 } 3171 3172 static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x, 3173 struct xfrm_policy *xp) 3174 { 3175 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire)) 3176 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 3177 + nla_total_size(sizeof(struct xfrm_mark)) 3178 + nla_total_size(xfrm_user_sec_ctx_size(x->security)) 3179 + userpolicy_type_attrsize(); 3180 } 3181 3182 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x, 3183 struct xfrm_tmpl *xt, struct xfrm_policy *xp) 3184 { 3185 __u32 seq = xfrm_get_acqseq(); 3186 struct xfrm_user_acquire *ua; 3187 struct nlmsghdr *nlh; 3188 int err; 3189 3190 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0); 3191 if (nlh == NULL) 3192 return -EMSGSIZE; 3193 3194 ua = nlmsg_data(nlh); 3195 memcpy(&ua->id, &x->id, sizeof(ua->id)); 3196 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr)); 3197 memcpy(&ua->sel, &x->sel, sizeof(ua->sel)); 3198 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT); 3199 ua->aalgos = xt->aalgos; 3200 ua->ealgos = xt->ealgos; 3201 ua->calgos = xt->calgos; 3202 ua->seq = x->km.seq = seq; 3203 3204 err = copy_to_user_tmpl(xp, skb); 3205 if (!err) 3206 err = copy_to_user_state_sec_ctx(x, skb); 3207 if (!err) 3208 err = copy_to_user_policy_type(xp->type, skb); 3209 if (!err) 3210 err = xfrm_mark_put(skb, &xp->mark); 3211 if (!err) 3212 err = xfrm_if_id_put(skb, xp->if_id); 3213 if (err) { 3214 nlmsg_cancel(skb, nlh); 3215 return err; 3216 } 3217 3218 nlmsg_end(skb, nlh); 3219 return 0; 3220 } 3221 3222 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt, 3223 struct xfrm_policy *xp) 3224 { 3225 struct net *net = xs_net(x); 3226 struct sk_buff *skb; 3227 int err; 3228 3229 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC); 3230 if (skb == NULL) 3231 return -ENOMEM; 3232 3233 err = build_acquire(skb, x, xt, xp); 3234 BUG_ON(err < 0); 3235 3236 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE); 3237 } 3238 3239 /* User gives us xfrm_user_policy_info followed by an array of 0 3240 * or more templates. 3241 */ 3242 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt, 3243 u8 *data, int len, int *dir) 3244 { 3245 struct net *net = sock_net(sk); 3246 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data; 3247 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1); 3248 struct xfrm_policy *xp; 3249 int nr; 3250 3251 switch (sk->sk_family) { 3252 case AF_INET: 3253 if (opt != IP_XFRM_POLICY) { 3254 *dir = -EOPNOTSUPP; 3255 return NULL; 3256 } 3257 break; 3258 #if IS_ENABLED(CONFIG_IPV6) 3259 case AF_INET6: 3260 if (opt != IPV6_XFRM_POLICY) { 3261 *dir = -EOPNOTSUPP; 3262 return NULL; 3263 } 3264 break; 3265 #endif 3266 default: 3267 *dir = -EINVAL; 3268 return NULL; 3269 } 3270 3271 *dir = -EINVAL; 3272 3273 if (len < sizeof(*p) || 3274 verify_newpolicy_info(p)) 3275 return NULL; 3276 3277 nr = ((len - sizeof(*p)) / sizeof(*ut)); 3278 if (validate_tmpl(nr, ut, p->sel.family)) 3279 return NULL; 3280 3281 if (p->dir > XFRM_POLICY_OUT) 3282 return NULL; 3283 3284 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 3285 if (xp == NULL) { 3286 *dir = -ENOBUFS; 3287 return NULL; 3288 } 3289 3290 copy_from_user_policy(xp, p); 3291 xp->type = XFRM_POLICY_TYPE_MAIN; 3292 copy_templates(xp, ut, nr); 3293 3294 *dir = p->dir; 3295 3296 return xp; 3297 } 3298 3299 static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp) 3300 { 3301 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire)) 3302 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 3303 + nla_total_size(xfrm_user_sec_ctx_size(xp->security)) 3304 + nla_total_size(sizeof(struct xfrm_mark)) 3305 + userpolicy_type_attrsize(); 3306 } 3307 3308 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp, 3309 int dir, const struct km_event *c) 3310 { 3311 struct xfrm_user_polexpire *upe; 3312 int hard = c->data.hard; 3313 struct nlmsghdr *nlh; 3314 int err; 3315 3316 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0); 3317 if (nlh == NULL) 3318 return -EMSGSIZE; 3319 3320 upe = nlmsg_data(nlh); 3321 copy_to_user_policy(xp, &upe->pol, dir); 3322 err = copy_to_user_tmpl(xp, skb); 3323 if (!err) 3324 err = copy_to_user_sec_ctx(xp, skb); 3325 if (!err) 3326 err = copy_to_user_policy_type(xp->type, skb); 3327 if (!err) 3328 err = xfrm_mark_put(skb, &xp->mark); 3329 if (!err) 3330 err = xfrm_if_id_put(skb, xp->if_id); 3331 if (err) { 3332 nlmsg_cancel(skb, nlh); 3333 return err; 3334 } 3335 upe->hard = !!hard; 3336 3337 nlmsg_end(skb, nlh); 3338 return 0; 3339 } 3340 3341 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 3342 { 3343 struct net *net = xp_net(xp); 3344 struct sk_buff *skb; 3345 int err; 3346 3347 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC); 3348 if (skb == NULL) 3349 return -ENOMEM; 3350 3351 err = build_polexpire(skb, xp, dir, c); 3352 BUG_ON(err < 0); 3353 3354 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE); 3355 } 3356 3357 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) 3358 { 3359 unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); 3360 struct net *net = xp_net(xp); 3361 struct xfrm_userpolicy_info *p; 3362 struct xfrm_userpolicy_id *id; 3363 struct nlmsghdr *nlh; 3364 struct sk_buff *skb; 3365 unsigned int headlen; 3366 int err; 3367 3368 headlen = sizeof(*p); 3369 if (c->event == XFRM_MSG_DELPOLICY) { 3370 len += nla_total_size(headlen); 3371 headlen = sizeof(*id); 3372 } 3373 len += userpolicy_type_attrsize(); 3374 len += nla_total_size(sizeof(struct xfrm_mark)); 3375 len += NLMSG_ALIGN(headlen); 3376 3377 skb = nlmsg_new(len, GFP_ATOMIC); 3378 if (skb == NULL) 3379 return -ENOMEM; 3380 3381 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); 3382 err = -EMSGSIZE; 3383 if (nlh == NULL) 3384 goto out_free_skb; 3385 3386 p = nlmsg_data(nlh); 3387 if (c->event == XFRM_MSG_DELPOLICY) { 3388 struct nlattr *attr; 3389 3390 id = nlmsg_data(nlh); 3391 memset(id, 0, sizeof(*id)); 3392 id->dir = dir; 3393 if (c->data.byid) 3394 id->index = xp->index; 3395 else 3396 memcpy(&id->sel, &xp->selector, sizeof(id->sel)); 3397 3398 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p)); 3399 err = -EMSGSIZE; 3400 if (attr == NULL) 3401 goto out_free_skb; 3402 3403 p = nla_data(attr); 3404 } 3405 3406 copy_to_user_policy(xp, p, dir); 3407 err = copy_to_user_tmpl(xp, skb); 3408 if (!err) 3409 err = copy_to_user_policy_type(xp->type, skb); 3410 if (!err) 3411 err = xfrm_mark_put(skb, &xp->mark); 3412 if (!err) 3413 err = xfrm_if_id_put(skb, xp->if_id); 3414 if (err) 3415 goto out_free_skb; 3416 3417 nlmsg_end(skb, nlh); 3418 3419 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 3420 3421 out_free_skb: 3422 kfree_skb(skb); 3423 return err; 3424 } 3425 3426 static int xfrm_notify_policy_flush(const struct km_event *c) 3427 { 3428 struct net *net = c->net; 3429 struct nlmsghdr *nlh; 3430 struct sk_buff *skb; 3431 int err; 3432 3433 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC); 3434 if (skb == NULL) 3435 return -ENOMEM; 3436 3437 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0); 3438 err = -EMSGSIZE; 3439 if (nlh == NULL) 3440 goto out_free_skb; 3441 err = copy_to_user_policy_type(c->data.type, skb); 3442 if (err) 3443 goto out_free_skb; 3444 3445 nlmsg_end(skb, nlh); 3446 3447 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 3448 3449 out_free_skb: 3450 kfree_skb(skb); 3451 return err; 3452 } 3453 3454 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 3455 { 3456 3457 switch (c->event) { 3458 case XFRM_MSG_NEWPOLICY: 3459 case XFRM_MSG_UPDPOLICY: 3460 case XFRM_MSG_DELPOLICY: 3461 return xfrm_notify_policy(xp, dir, c); 3462 case XFRM_MSG_FLUSHPOLICY: 3463 return xfrm_notify_policy_flush(c); 3464 case XFRM_MSG_POLEXPIRE: 3465 return xfrm_exp_policy_notify(xp, dir, c); 3466 default: 3467 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n", 3468 c->event); 3469 } 3470 3471 return 0; 3472 3473 } 3474 3475 static inline unsigned int xfrm_report_msgsize(void) 3476 { 3477 return NLMSG_ALIGN(sizeof(struct xfrm_user_report)); 3478 } 3479 3480 static int build_report(struct sk_buff *skb, u8 proto, 3481 struct xfrm_selector *sel, xfrm_address_t *addr) 3482 { 3483 struct xfrm_user_report *ur; 3484 struct nlmsghdr *nlh; 3485 3486 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0); 3487 if (nlh == NULL) 3488 return -EMSGSIZE; 3489 3490 ur = nlmsg_data(nlh); 3491 ur->proto = proto; 3492 memcpy(&ur->sel, sel, sizeof(ur->sel)); 3493 3494 if (addr) { 3495 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr); 3496 if (err) { 3497 nlmsg_cancel(skb, nlh); 3498 return err; 3499 } 3500 } 3501 nlmsg_end(skb, nlh); 3502 return 0; 3503 } 3504 3505 static int xfrm_send_report(struct net *net, u8 proto, 3506 struct xfrm_selector *sel, xfrm_address_t *addr) 3507 { 3508 struct sk_buff *skb; 3509 int err; 3510 3511 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC); 3512 if (skb == NULL) 3513 return -ENOMEM; 3514 3515 err = build_report(skb, proto, sel, addr); 3516 BUG_ON(err < 0); 3517 3518 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT); 3519 } 3520 3521 static inline unsigned int xfrm_mapping_msgsize(void) 3522 { 3523 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping)); 3524 } 3525 3526 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x, 3527 xfrm_address_t *new_saddr, __be16 new_sport) 3528 { 3529 struct xfrm_user_mapping *um; 3530 struct nlmsghdr *nlh; 3531 3532 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0); 3533 if (nlh == NULL) 3534 return -EMSGSIZE; 3535 3536 um = nlmsg_data(nlh); 3537 3538 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr)); 3539 um->id.spi = x->id.spi; 3540 um->id.family = x->props.family; 3541 um->id.proto = x->id.proto; 3542 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr)); 3543 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr)); 3544 um->new_sport = new_sport; 3545 um->old_sport = x->encap->encap_sport; 3546 um->reqid = x->props.reqid; 3547 3548 nlmsg_end(skb, nlh); 3549 return 0; 3550 } 3551 3552 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, 3553 __be16 sport) 3554 { 3555 struct net *net = xs_net(x); 3556 struct sk_buff *skb; 3557 int err; 3558 3559 if (x->id.proto != IPPROTO_ESP) 3560 return -EINVAL; 3561 3562 if (!x->encap) 3563 return -EINVAL; 3564 3565 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC); 3566 if (skb == NULL) 3567 return -ENOMEM; 3568 3569 err = build_mapping(skb, x, ipaddr, sport); 3570 BUG_ON(err < 0); 3571 3572 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING); 3573 } 3574 3575 static bool xfrm_is_alive(const struct km_event *c) 3576 { 3577 return (bool)xfrm_acquire_is_on(c->net); 3578 } 3579 3580 static struct xfrm_mgr netlink_mgr = { 3581 .notify = xfrm_send_state_notify, 3582 .acquire = xfrm_send_acquire, 3583 .compile_policy = xfrm_compile_policy, 3584 .notify_policy = xfrm_send_policy_notify, 3585 .report = xfrm_send_report, 3586 .migrate = xfrm_send_migrate, 3587 .new_mapping = xfrm_send_mapping, 3588 .is_alive = xfrm_is_alive, 3589 }; 3590 3591 static int __net_init xfrm_user_net_init(struct net *net) 3592 { 3593 struct sock *nlsk; 3594 struct netlink_kernel_cfg cfg = { 3595 .groups = XFRMNLGRP_MAX, 3596 .input = xfrm_netlink_rcv, 3597 }; 3598 3599 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg); 3600 if (nlsk == NULL) 3601 return -ENOMEM; 3602 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */ 3603 rcu_assign_pointer(net->xfrm.nlsk, nlsk); 3604 return 0; 3605 } 3606 3607 static void __net_exit xfrm_user_net_pre_exit(struct net *net) 3608 { 3609 RCU_INIT_POINTER(net->xfrm.nlsk, NULL); 3610 } 3611 3612 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list) 3613 { 3614 struct net *net; 3615 3616 list_for_each_entry(net, net_exit_list, exit_list) 3617 netlink_kernel_release(net->xfrm.nlsk_stash); 3618 } 3619 3620 static struct pernet_operations xfrm_user_net_ops = { 3621 .init = xfrm_user_net_init, 3622 .pre_exit = xfrm_user_net_pre_exit, 3623 .exit_batch = xfrm_user_net_exit, 3624 }; 3625 3626 static int __init xfrm_user_init(void) 3627 { 3628 int rv; 3629 3630 printk(KERN_INFO "Initializing XFRM netlink socket\n"); 3631 3632 rv = register_pernet_subsys(&xfrm_user_net_ops); 3633 if (rv < 0) 3634 return rv; 3635 rv = xfrm_register_km(&netlink_mgr); 3636 if (rv < 0) 3637 unregister_pernet_subsys(&xfrm_user_net_ops); 3638 return rv; 3639 } 3640 3641 static void __exit xfrm_user_exit(void) 3642 { 3643 xfrm_unregister_km(&netlink_mgr); 3644 unregister_pernet_subsys(&xfrm_user_net_ops); 3645 } 3646 3647 module_init(xfrm_user_init); 3648 module_exit(xfrm_user_exit); 3649 MODULE_LICENSE("GPL"); 3650 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM); 3651