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_POL_DEFAULT_IN ? 1998 XFRM_USERPOLICY_BLOCK : XFRM_USERPOLICY_ACCEPT; 1999 up->fwd = net->xfrm.policy_default & XFRM_POL_DEFAULT_FWD ? 2000 XFRM_USERPOLICY_BLOCK : XFRM_USERPOLICY_ACCEPT; 2001 up->out = net->xfrm.policy_default & XFRM_POL_DEFAULT_OUT ? 2002 XFRM_USERPOLICY_BLOCK : XFRM_USERPOLICY_ACCEPT; 2003 2004 nlmsg_end(skb, nlh); 2005 2006 rcu_read_lock(); 2007 err = xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 2008 rcu_read_unlock(); 2009 2010 return err; 2011 } 2012 2013 static int xfrm_set_default(struct sk_buff *skb, struct nlmsghdr *nlh, 2014 struct nlattr **attrs) 2015 { 2016 struct net *net = sock_net(skb->sk); 2017 struct xfrm_userpolicy_default *up = nlmsg_data(nlh); 2018 2019 if (up->in == XFRM_USERPOLICY_BLOCK) 2020 net->xfrm.policy_default |= XFRM_POL_DEFAULT_IN; 2021 else if (up->in == XFRM_USERPOLICY_ACCEPT) 2022 net->xfrm.policy_default &= ~XFRM_POL_DEFAULT_IN; 2023 2024 if (up->fwd == XFRM_USERPOLICY_BLOCK) 2025 net->xfrm.policy_default |= XFRM_POL_DEFAULT_FWD; 2026 else if (up->fwd == XFRM_USERPOLICY_ACCEPT) 2027 net->xfrm.policy_default &= ~XFRM_POL_DEFAULT_FWD; 2028 2029 if (up->out == XFRM_USERPOLICY_BLOCK) 2030 net->xfrm.policy_default |= XFRM_POL_DEFAULT_OUT; 2031 else if (up->out == XFRM_USERPOLICY_ACCEPT) 2032 net->xfrm.policy_default &= ~XFRM_POL_DEFAULT_OUT; 2033 2034 rt_genid_bump_all(net); 2035 2036 xfrm_notify_userpolicy(net); 2037 return 0; 2038 } 2039 2040 static int xfrm_get_default(struct sk_buff *skb, struct nlmsghdr *nlh, 2041 struct nlattr **attrs) 2042 { 2043 struct sk_buff *r_skb; 2044 struct nlmsghdr *r_nlh; 2045 struct net *net = sock_net(skb->sk); 2046 struct xfrm_userpolicy_default *r_up; 2047 int len = NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_default)); 2048 u32 portid = NETLINK_CB(skb).portid; 2049 u32 seq = nlh->nlmsg_seq; 2050 2051 r_skb = nlmsg_new(len, GFP_ATOMIC); 2052 if (!r_skb) 2053 return -ENOMEM; 2054 2055 r_nlh = nlmsg_put(r_skb, portid, seq, XFRM_MSG_GETDEFAULT, sizeof(*r_up), 0); 2056 if (!r_nlh) { 2057 kfree_skb(r_skb); 2058 return -EMSGSIZE; 2059 } 2060 2061 r_up = nlmsg_data(r_nlh); 2062 2063 r_up->in = net->xfrm.policy_default & XFRM_POL_DEFAULT_IN ? 2064 XFRM_USERPOLICY_BLOCK : XFRM_USERPOLICY_ACCEPT; 2065 r_up->fwd = net->xfrm.policy_default & XFRM_POL_DEFAULT_FWD ? 2066 XFRM_USERPOLICY_BLOCK : XFRM_USERPOLICY_ACCEPT; 2067 r_up->out = net->xfrm.policy_default & XFRM_POL_DEFAULT_OUT ? 2068 XFRM_USERPOLICY_BLOCK : XFRM_USERPOLICY_ACCEPT; 2069 nlmsg_end(r_skb, r_nlh); 2070 2071 return nlmsg_unicast(net->xfrm.nlsk, r_skb, portid); 2072 } 2073 2074 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 2075 struct nlattr **attrs) 2076 { 2077 struct net *net = sock_net(skb->sk); 2078 struct xfrm_policy *xp; 2079 struct xfrm_userpolicy_id *p; 2080 u8 type = XFRM_POLICY_TYPE_MAIN; 2081 int err; 2082 struct km_event c; 2083 int delete; 2084 struct xfrm_mark m; 2085 u32 if_id = 0; 2086 2087 p = nlmsg_data(nlh); 2088 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY; 2089 2090 err = copy_from_user_policy_type(&type, attrs); 2091 if (err) 2092 return err; 2093 2094 err = verify_policy_dir(p->dir); 2095 if (err) 2096 return err; 2097 2098 if (attrs[XFRMA_IF_ID]) 2099 if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 2100 2101 xfrm_mark_get(attrs, &m); 2102 2103 if (p->index) 2104 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir, 2105 p->index, delete, &err); 2106 else { 2107 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 2108 struct xfrm_sec_ctx *ctx; 2109 2110 err = verify_sec_ctx_len(attrs); 2111 if (err) 2112 return err; 2113 2114 ctx = NULL; 2115 if (rt) { 2116 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 2117 2118 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); 2119 if (err) 2120 return err; 2121 } 2122 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir, 2123 &p->sel, ctx, delete, &err); 2124 security_xfrm_policy_free(ctx); 2125 } 2126 if (xp == NULL) 2127 return -ENOENT; 2128 2129 if (!delete) { 2130 struct sk_buff *resp_skb; 2131 2132 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq); 2133 if (IS_ERR(resp_skb)) { 2134 err = PTR_ERR(resp_skb); 2135 } else { 2136 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, 2137 NETLINK_CB(skb).portid); 2138 } 2139 } else { 2140 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 2141 2142 if (err != 0) 2143 goto out; 2144 2145 c.data.byid = p->index; 2146 c.event = nlh->nlmsg_type; 2147 c.seq = nlh->nlmsg_seq; 2148 c.portid = nlh->nlmsg_pid; 2149 km_policy_notify(xp, p->dir, &c); 2150 } 2151 2152 out: 2153 xfrm_pol_put(xp); 2154 return err; 2155 } 2156 2157 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 2158 struct nlattr **attrs) 2159 { 2160 struct net *net = sock_net(skb->sk); 2161 struct km_event c; 2162 struct xfrm_usersa_flush *p = nlmsg_data(nlh); 2163 int err; 2164 2165 err = xfrm_state_flush(net, p->proto, true, false); 2166 if (err) { 2167 if (err == -ESRCH) /* empty table */ 2168 return 0; 2169 return err; 2170 } 2171 c.data.proto = p->proto; 2172 c.event = nlh->nlmsg_type; 2173 c.seq = nlh->nlmsg_seq; 2174 c.portid = nlh->nlmsg_pid; 2175 c.net = net; 2176 km_state_notify(NULL, &c); 2177 2178 return 0; 2179 } 2180 2181 static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x) 2182 { 2183 unsigned int replay_size = x->replay_esn ? 2184 xfrm_replay_state_esn_len(x->replay_esn) : 2185 sizeof(struct xfrm_replay_state); 2186 2187 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id)) 2188 + nla_total_size(replay_size) 2189 + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur)) 2190 + nla_total_size(sizeof(struct xfrm_mark)) 2191 + nla_total_size(4) /* XFRM_AE_RTHR */ 2192 + nla_total_size(4); /* XFRM_AE_ETHR */ 2193 } 2194 2195 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 2196 { 2197 struct xfrm_aevent_id *id; 2198 struct nlmsghdr *nlh; 2199 int err; 2200 2201 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0); 2202 if (nlh == NULL) 2203 return -EMSGSIZE; 2204 2205 id = nlmsg_data(nlh); 2206 memset(&id->sa_id, 0, sizeof(id->sa_id)); 2207 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr)); 2208 id->sa_id.spi = x->id.spi; 2209 id->sa_id.family = x->props.family; 2210 id->sa_id.proto = x->id.proto; 2211 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr)); 2212 id->reqid = x->props.reqid; 2213 id->flags = c->data.aevent; 2214 2215 if (x->replay_esn) { 2216 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL, 2217 xfrm_replay_state_esn_len(x->replay_esn), 2218 x->replay_esn); 2219 } else { 2220 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), 2221 &x->replay); 2222 } 2223 if (err) 2224 goto out_cancel; 2225 err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft, 2226 XFRMA_PAD); 2227 if (err) 2228 goto out_cancel; 2229 2230 if (id->flags & XFRM_AE_RTHR) { 2231 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff); 2232 if (err) 2233 goto out_cancel; 2234 } 2235 if (id->flags & XFRM_AE_ETHR) { 2236 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH, 2237 x->replay_maxage * 10 / HZ); 2238 if (err) 2239 goto out_cancel; 2240 } 2241 err = xfrm_mark_put(skb, &x->mark); 2242 if (err) 2243 goto out_cancel; 2244 2245 err = xfrm_if_id_put(skb, x->if_id); 2246 if (err) 2247 goto out_cancel; 2248 2249 nlmsg_end(skb, nlh); 2250 return 0; 2251 2252 out_cancel: 2253 nlmsg_cancel(skb, nlh); 2254 return err; 2255 } 2256 2257 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 2258 struct nlattr **attrs) 2259 { 2260 struct net *net = sock_net(skb->sk); 2261 struct xfrm_state *x; 2262 struct sk_buff *r_skb; 2263 int err; 2264 struct km_event c; 2265 u32 mark; 2266 struct xfrm_mark m; 2267 struct xfrm_aevent_id *p = nlmsg_data(nlh); 2268 struct xfrm_usersa_id *id = &p->sa_id; 2269 2270 mark = xfrm_mark_get(attrs, &m); 2271 2272 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family); 2273 if (x == NULL) 2274 return -ESRCH; 2275 2276 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 2277 if (r_skb == NULL) { 2278 xfrm_state_put(x); 2279 return -ENOMEM; 2280 } 2281 2282 /* 2283 * XXX: is this lock really needed - none of the other 2284 * gets lock (the concern is things getting updated 2285 * while we are still reading) - jhs 2286 */ 2287 spin_lock_bh(&x->lock); 2288 c.data.aevent = p->flags; 2289 c.seq = nlh->nlmsg_seq; 2290 c.portid = nlh->nlmsg_pid; 2291 2292 err = build_aevent(r_skb, x, &c); 2293 BUG_ON(err < 0); 2294 2295 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid); 2296 spin_unlock_bh(&x->lock); 2297 xfrm_state_put(x); 2298 return err; 2299 } 2300 2301 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 2302 struct nlattr **attrs) 2303 { 2304 struct net *net = sock_net(skb->sk); 2305 struct xfrm_state *x; 2306 struct km_event c; 2307 int err = -EINVAL; 2308 u32 mark = 0; 2309 struct xfrm_mark m; 2310 struct xfrm_aevent_id *p = nlmsg_data(nlh); 2311 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 2312 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL]; 2313 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 2314 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; 2315 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; 2316 2317 if (!lt && !rp && !re && !et && !rt) 2318 return err; 2319 2320 /* pedantic mode - thou shalt sayeth replaceth */ 2321 if (!(nlh->nlmsg_flags&NLM_F_REPLACE)) 2322 return err; 2323 2324 mark = xfrm_mark_get(attrs, &m); 2325 2326 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family); 2327 if (x == NULL) 2328 return -ESRCH; 2329 2330 if (x->km.state != XFRM_STATE_VALID) 2331 goto out; 2332 2333 err = xfrm_replay_verify_len(x->replay_esn, re); 2334 if (err) 2335 goto out; 2336 2337 spin_lock_bh(&x->lock); 2338 xfrm_update_ae_params(x, attrs, 1); 2339 spin_unlock_bh(&x->lock); 2340 2341 c.event = nlh->nlmsg_type; 2342 c.seq = nlh->nlmsg_seq; 2343 c.portid = nlh->nlmsg_pid; 2344 c.data.aevent = XFRM_AE_CU; 2345 km_state_notify(x, &c); 2346 err = 0; 2347 out: 2348 xfrm_state_put(x); 2349 return err; 2350 } 2351 2352 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 2353 struct nlattr **attrs) 2354 { 2355 struct net *net = sock_net(skb->sk); 2356 struct km_event c; 2357 u8 type = XFRM_POLICY_TYPE_MAIN; 2358 int err; 2359 2360 err = copy_from_user_policy_type(&type, attrs); 2361 if (err) 2362 return err; 2363 2364 err = xfrm_policy_flush(net, type, true); 2365 if (err) { 2366 if (err == -ESRCH) /* empty table */ 2367 return 0; 2368 return err; 2369 } 2370 2371 c.data.type = type; 2372 c.event = nlh->nlmsg_type; 2373 c.seq = nlh->nlmsg_seq; 2374 c.portid = nlh->nlmsg_pid; 2375 c.net = net; 2376 km_policy_notify(NULL, 0, &c); 2377 return 0; 2378 } 2379 2380 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 2381 struct nlattr **attrs) 2382 { 2383 struct net *net = sock_net(skb->sk); 2384 struct xfrm_policy *xp; 2385 struct xfrm_user_polexpire *up = nlmsg_data(nlh); 2386 struct xfrm_userpolicy_info *p = &up->pol; 2387 u8 type = XFRM_POLICY_TYPE_MAIN; 2388 int err = -ENOENT; 2389 struct xfrm_mark m; 2390 u32 if_id = 0; 2391 2392 err = copy_from_user_policy_type(&type, attrs); 2393 if (err) 2394 return err; 2395 2396 err = verify_policy_dir(p->dir); 2397 if (err) 2398 return err; 2399 2400 if (attrs[XFRMA_IF_ID]) 2401 if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 2402 2403 xfrm_mark_get(attrs, &m); 2404 2405 if (p->index) 2406 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir, p->index, 2407 0, &err); 2408 else { 2409 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 2410 struct xfrm_sec_ctx *ctx; 2411 2412 err = verify_sec_ctx_len(attrs); 2413 if (err) 2414 return err; 2415 2416 ctx = NULL; 2417 if (rt) { 2418 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 2419 2420 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); 2421 if (err) 2422 return err; 2423 } 2424 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir, 2425 &p->sel, ctx, 0, &err); 2426 security_xfrm_policy_free(ctx); 2427 } 2428 if (xp == NULL) 2429 return -ENOENT; 2430 2431 if (unlikely(xp->walk.dead)) 2432 goto out; 2433 2434 err = 0; 2435 if (up->hard) { 2436 xfrm_policy_delete(xp, p->dir); 2437 xfrm_audit_policy_delete(xp, 1, true); 2438 } 2439 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid); 2440 2441 out: 2442 xfrm_pol_put(xp); 2443 return err; 2444 } 2445 2446 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 2447 struct nlattr **attrs) 2448 { 2449 struct net *net = sock_net(skb->sk); 2450 struct xfrm_state *x; 2451 int err; 2452 struct xfrm_user_expire *ue = nlmsg_data(nlh); 2453 struct xfrm_usersa_info *p = &ue->state; 2454 struct xfrm_mark m; 2455 u32 mark = xfrm_mark_get(attrs, &m); 2456 2457 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family); 2458 2459 err = -ENOENT; 2460 if (x == NULL) 2461 return err; 2462 2463 spin_lock_bh(&x->lock); 2464 err = -EINVAL; 2465 if (x->km.state != XFRM_STATE_VALID) 2466 goto out; 2467 km_state_expired(x, ue->hard, nlh->nlmsg_pid); 2468 2469 if (ue->hard) { 2470 __xfrm_state_delete(x); 2471 xfrm_audit_state_delete(x, 1, true); 2472 } 2473 err = 0; 2474 out: 2475 spin_unlock_bh(&x->lock); 2476 xfrm_state_put(x); 2477 return err; 2478 } 2479 2480 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, 2481 struct nlattr **attrs) 2482 { 2483 struct net *net = sock_net(skb->sk); 2484 struct xfrm_policy *xp; 2485 struct xfrm_user_tmpl *ut; 2486 int i; 2487 struct nlattr *rt = attrs[XFRMA_TMPL]; 2488 struct xfrm_mark mark; 2489 2490 struct xfrm_user_acquire *ua = nlmsg_data(nlh); 2491 struct xfrm_state *x = xfrm_state_alloc(net); 2492 int err = -ENOMEM; 2493 2494 if (!x) 2495 goto nomem; 2496 2497 xfrm_mark_get(attrs, &mark); 2498 2499 err = verify_newpolicy_info(&ua->policy); 2500 if (err) 2501 goto free_state; 2502 err = verify_sec_ctx_len(attrs); 2503 if (err) 2504 goto free_state; 2505 2506 /* build an XP */ 2507 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err); 2508 if (!xp) 2509 goto free_state; 2510 2511 memcpy(&x->id, &ua->id, sizeof(ua->id)); 2512 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr)); 2513 memcpy(&x->sel, &ua->sel, sizeof(ua->sel)); 2514 xp->mark.m = x->mark.m = mark.m; 2515 xp->mark.v = x->mark.v = mark.v; 2516 ut = nla_data(rt); 2517 /* extract the templates and for each call km_key */ 2518 for (i = 0; i < xp->xfrm_nr; i++, ut++) { 2519 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 2520 memcpy(&x->id, &t->id, sizeof(x->id)); 2521 x->props.mode = t->mode; 2522 x->props.reqid = t->reqid; 2523 x->props.family = ut->family; 2524 t->aalgos = ua->aalgos; 2525 t->ealgos = ua->ealgos; 2526 t->calgos = ua->calgos; 2527 err = km_query(x, t, xp); 2528 2529 } 2530 2531 xfrm_state_free(x); 2532 kfree(xp); 2533 2534 return 0; 2535 2536 free_state: 2537 xfrm_state_free(x); 2538 nomem: 2539 return err; 2540 } 2541 2542 #ifdef CONFIG_XFRM_MIGRATE 2543 static int copy_from_user_migrate(struct xfrm_migrate *ma, 2544 struct xfrm_kmaddress *k, 2545 struct nlattr **attrs, int *num) 2546 { 2547 struct nlattr *rt = attrs[XFRMA_MIGRATE]; 2548 struct xfrm_user_migrate *um; 2549 int i, num_migrate; 2550 2551 if (k != NULL) { 2552 struct xfrm_user_kmaddress *uk; 2553 2554 uk = nla_data(attrs[XFRMA_KMADDRESS]); 2555 memcpy(&k->local, &uk->local, sizeof(k->local)); 2556 memcpy(&k->remote, &uk->remote, sizeof(k->remote)); 2557 k->family = uk->family; 2558 k->reserved = uk->reserved; 2559 } 2560 2561 um = nla_data(rt); 2562 num_migrate = nla_len(rt) / sizeof(*um); 2563 2564 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH) 2565 return -EINVAL; 2566 2567 for (i = 0; i < num_migrate; i++, um++, ma++) { 2568 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr)); 2569 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr)); 2570 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr)); 2571 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr)); 2572 2573 ma->proto = um->proto; 2574 ma->mode = um->mode; 2575 ma->reqid = um->reqid; 2576 2577 ma->old_family = um->old_family; 2578 ma->new_family = um->new_family; 2579 } 2580 2581 *num = i; 2582 return 0; 2583 } 2584 2585 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 2586 struct nlattr **attrs) 2587 { 2588 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh); 2589 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 2590 struct xfrm_kmaddress km, *kmp; 2591 u8 type; 2592 int err; 2593 int n = 0; 2594 struct net *net = sock_net(skb->sk); 2595 struct xfrm_encap_tmpl *encap = NULL; 2596 2597 if (attrs[XFRMA_MIGRATE] == NULL) 2598 return -EINVAL; 2599 2600 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL; 2601 2602 err = copy_from_user_policy_type(&type, attrs); 2603 if (err) 2604 return err; 2605 2606 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n); 2607 if (err) 2608 return err; 2609 2610 if (!n) 2611 return 0; 2612 2613 if (attrs[XFRMA_ENCAP]) { 2614 encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]), 2615 sizeof(*encap), GFP_KERNEL); 2616 if (!encap) 2617 return -ENOMEM; 2618 } 2619 2620 err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap); 2621 2622 kfree(encap); 2623 2624 return err; 2625 } 2626 #else 2627 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 2628 struct nlattr **attrs) 2629 { 2630 return -ENOPROTOOPT; 2631 } 2632 #endif 2633 2634 #ifdef CONFIG_XFRM_MIGRATE 2635 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb) 2636 { 2637 struct xfrm_user_migrate um; 2638 2639 memset(&um, 0, sizeof(um)); 2640 um.proto = m->proto; 2641 um.mode = m->mode; 2642 um.reqid = m->reqid; 2643 um.old_family = m->old_family; 2644 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr)); 2645 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr)); 2646 um.new_family = m->new_family; 2647 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr)); 2648 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr)); 2649 2650 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um); 2651 } 2652 2653 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb) 2654 { 2655 struct xfrm_user_kmaddress uk; 2656 2657 memset(&uk, 0, sizeof(uk)); 2658 uk.family = k->family; 2659 uk.reserved = k->reserved; 2660 memcpy(&uk.local, &k->local, sizeof(uk.local)); 2661 memcpy(&uk.remote, &k->remote, sizeof(uk.remote)); 2662 2663 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk); 2664 } 2665 2666 static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma, 2667 int with_encp) 2668 { 2669 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id)) 2670 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0) 2671 + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0) 2672 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate) 2673 + userpolicy_type_attrsize(); 2674 } 2675 2676 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m, 2677 int num_migrate, const struct xfrm_kmaddress *k, 2678 const struct xfrm_selector *sel, 2679 const struct xfrm_encap_tmpl *encap, u8 dir, u8 type) 2680 { 2681 const struct xfrm_migrate *mp; 2682 struct xfrm_userpolicy_id *pol_id; 2683 struct nlmsghdr *nlh; 2684 int i, err; 2685 2686 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0); 2687 if (nlh == NULL) 2688 return -EMSGSIZE; 2689 2690 pol_id = nlmsg_data(nlh); 2691 /* copy data from selector, dir, and type to the pol_id */ 2692 memset(pol_id, 0, sizeof(*pol_id)); 2693 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel)); 2694 pol_id->dir = dir; 2695 2696 if (k != NULL) { 2697 err = copy_to_user_kmaddress(k, skb); 2698 if (err) 2699 goto out_cancel; 2700 } 2701 if (encap) { 2702 err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap); 2703 if (err) 2704 goto out_cancel; 2705 } 2706 err = copy_to_user_policy_type(type, skb); 2707 if (err) 2708 goto out_cancel; 2709 for (i = 0, mp = m ; i < num_migrate; i++, mp++) { 2710 err = copy_to_user_migrate(mp, skb); 2711 if (err) 2712 goto out_cancel; 2713 } 2714 2715 nlmsg_end(skb, nlh); 2716 return 0; 2717 2718 out_cancel: 2719 nlmsg_cancel(skb, nlh); 2720 return err; 2721 } 2722 2723 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2724 const struct xfrm_migrate *m, int num_migrate, 2725 const struct xfrm_kmaddress *k, 2726 const struct xfrm_encap_tmpl *encap) 2727 { 2728 struct net *net = &init_net; 2729 struct sk_buff *skb; 2730 int err; 2731 2732 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap), 2733 GFP_ATOMIC); 2734 if (skb == NULL) 2735 return -ENOMEM; 2736 2737 /* build migrate */ 2738 err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type); 2739 BUG_ON(err < 0); 2740 2741 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE); 2742 } 2743 #else 2744 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2745 const struct xfrm_migrate *m, int num_migrate, 2746 const struct xfrm_kmaddress *k, 2747 const struct xfrm_encap_tmpl *encap) 2748 { 2749 return -ENOPROTOOPT; 2750 } 2751 #endif 2752 2753 #define XMSGSIZE(type) sizeof(struct type) 2754 2755 const int xfrm_msg_min[XFRM_NR_MSGTYPES] = { 2756 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2757 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2758 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2759 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2760 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2761 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2762 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info), 2763 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire), 2764 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire), 2765 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2766 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2767 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire), 2768 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush), 2769 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0, 2770 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2771 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2772 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report), 2773 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2774 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32), 2775 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 2776 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 2777 [XFRM_MSG_SETDEFAULT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default), 2778 [XFRM_MSG_GETDEFAULT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default), 2779 }; 2780 EXPORT_SYMBOL_GPL(xfrm_msg_min); 2781 2782 #undef XMSGSIZE 2783 2784 const struct nla_policy xfrma_policy[XFRMA_MAX+1] = { 2785 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)}, 2786 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)}, 2787 [XFRMA_LASTUSED] = { .type = NLA_U64}, 2788 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)}, 2789 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) }, 2790 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) }, 2791 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) }, 2792 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) }, 2793 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) }, 2794 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) }, 2795 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) }, 2796 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) }, 2797 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) }, 2798 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 }, 2799 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 }, 2800 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) }, 2801 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) }, 2802 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)}, 2803 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) }, 2804 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) }, 2805 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) }, 2806 [XFRMA_TFCPAD] = { .type = NLA_U32 }, 2807 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) }, 2808 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 }, 2809 [XFRMA_PROTO] = { .type = NLA_U8 }, 2810 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) }, 2811 [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) }, 2812 [XFRMA_SET_MARK] = { .type = NLA_U32 }, 2813 [XFRMA_SET_MARK_MASK] = { .type = NLA_U32 }, 2814 [XFRMA_IF_ID] = { .type = NLA_U32 }, 2815 }; 2816 EXPORT_SYMBOL_GPL(xfrma_policy); 2817 2818 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = { 2819 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) }, 2820 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) }, 2821 }; 2822 2823 static const struct xfrm_link { 2824 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **); 2825 int (*start)(struct netlink_callback *); 2826 int (*dump)(struct sk_buff *, struct netlink_callback *); 2827 int (*done)(struct netlink_callback *); 2828 const struct nla_policy *nla_pol; 2829 int nla_max; 2830 } xfrm_dispatch[XFRM_NR_MSGTYPES] = { 2831 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 2832 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa }, 2833 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa, 2834 .dump = xfrm_dump_sa, 2835 .done = xfrm_dump_sa_done }, 2836 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 2837 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy }, 2838 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy, 2839 .start = xfrm_dump_policy_start, 2840 .dump = xfrm_dump_policy, 2841 .done = xfrm_dump_policy_done }, 2842 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi }, 2843 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire }, 2844 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire }, 2845 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 2846 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 2847 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire}, 2848 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa }, 2849 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy }, 2850 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae }, 2851 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae }, 2852 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate }, 2853 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo }, 2854 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo, 2855 .nla_pol = xfrma_spd_policy, 2856 .nla_max = XFRMA_SPD_MAX }, 2857 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo }, 2858 [XFRM_MSG_SETDEFAULT - XFRM_MSG_BASE] = { .doit = xfrm_set_default }, 2859 [XFRM_MSG_GETDEFAULT - XFRM_MSG_BASE] = { .doit = xfrm_get_default }, 2860 }; 2861 2862 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, 2863 struct netlink_ext_ack *extack) 2864 { 2865 struct net *net = sock_net(skb->sk); 2866 struct nlattr *attrs[XFRMA_MAX+1]; 2867 const struct xfrm_link *link; 2868 struct nlmsghdr *nlh64 = NULL; 2869 int type, err; 2870 2871 type = nlh->nlmsg_type; 2872 if (type > XFRM_MSG_MAX) 2873 return -EINVAL; 2874 2875 type -= XFRM_MSG_BASE; 2876 link = &xfrm_dispatch[type]; 2877 2878 /* All operations require privileges, even GET */ 2879 if (!netlink_net_capable(skb, CAP_NET_ADMIN)) 2880 return -EPERM; 2881 2882 if (in_compat_syscall()) { 2883 struct xfrm_translator *xtr = xfrm_get_translator(); 2884 2885 if (!xtr) 2886 return -EOPNOTSUPP; 2887 2888 nlh64 = xtr->rcv_msg_compat(nlh, link->nla_max, 2889 link->nla_pol, extack); 2890 xfrm_put_translator(xtr); 2891 if (IS_ERR(nlh64)) 2892 return PTR_ERR(nlh64); 2893 if (nlh64) 2894 nlh = nlh64; 2895 } 2896 2897 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) || 2898 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) && 2899 (nlh->nlmsg_flags & NLM_F_DUMP)) { 2900 struct netlink_dump_control c = { 2901 .start = link->start, 2902 .dump = link->dump, 2903 .done = link->done, 2904 }; 2905 2906 if (link->dump == NULL) { 2907 err = -EINVAL; 2908 goto err; 2909 } 2910 2911 err = netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c); 2912 goto err; 2913 } 2914 2915 err = nlmsg_parse_deprecated(nlh, xfrm_msg_min[type], attrs, 2916 link->nla_max ? : XFRMA_MAX, 2917 link->nla_pol ? : xfrma_policy, extack); 2918 if (err < 0) 2919 goto err; 2920 2921 if (link->doit == NULL) { 2922 err = -EINVAL; 2923 goto err; 2924 } 2925 2926 err = link->doit(skb, nlh, attrs); 2927 2928 /* We need to free skb allocated in xfrm_alloc_compat() before 2929 * returning from this function, because consume_skb() won't take 2930 * care of frag_list since netlink destructor sets 2931 * sbk->head to NULL. (see netlink_skb_destructor()) 2932 */ 2933 if (skb_has_frag_list(skb)) { 2934 kfree_skb(skb_shinfo(skb)->frag_list); 2935 skb_shinfo(skb)->frag_list = NULL; 2936 } 2937 2938 err: 2939 kvfree(nlh64); 2940 return err; 2941 } 2942 2943 static void xfrm_netlink_rcv(struct sk_buff *skb) 2944 { 2945 struct net *net = sock_net(skb->sk); 2946 2947 mutex_lock(&net->xfrm.xfrm_cfg_mutex); 2948 netlink_rcv_skb(skb, &xfrm_user_rcv_msg); 2949 mutex_unlock(&net->xfrm.xfrm_cfg_mutex); 2950 } 2951 2952 static inline unsigned int xfrm_expire_msgsize(void) 2953 { 2954 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire)) 2955 + nla_total_size(sizeof(struct xfrm_mark)); 2956 } 2957 2958 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 2959 { 2960 struct xfrm_user_expire *ue; 2961 struct nlmsghdr *nlh; 2962 int err; 2963 2964 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0); 2965 if (nlh == NULL) 2966 return -EMSGSIZE; 2967 2968 ue = nlmsg_data(nlh); 2969 copy_to_user_state(x, &ue->state); 2970 ue->hard = (c->data.hard != 0) ? 1 : 0; 2971 /* clear the padding bytes */ 2972 memset_after(ue, 0, hard); 2973 2974 err = xfrm_mark_put(skb, &x->mark); 2975 if (err) 2976 return err; 2977 2978 err = xfrm_if_id_put(skb, x->if_id); 2979 if (err) 2980 return err; 2981 2982 nlmsg_end(skb, nlh); 2983 return 0; 2984 } 2985 2986 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c) 2987 { 2988 struct net *net = xs_net(x); 2989 struct sk_buff *skb; 2990 2991 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC); 2992 if (skb == NULL) 2993 return -ENOMEM; 2994 2995 if (build_expire(skb, x, c) < 0) { 2996 kfree_skb(skb); 2997 return -EMSGSIZE; 2998 } 2999 3000 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE); 3001 } 3002 3003 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c) 3004 { 3005 struct net *net = xs_net(x); 3006 struct sk_buff *skb; 3007 int err; 3008 3009 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 3010 if (skb == NULL) 3011 return -ENOMEM; 3012 3013 err = build_aevent(skb, x, c); 3014 BUG_ON(err < 0); 3015 3016 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS); 3017 } 3018 3019 static int xfrm_notify_sa_flush(const struct km_event *c) 3020 { 3021 struct net *net = c->net; 3022 struct xfrm_usersa_flush *p; 3023 struct nlmsghdr *nlh; 3024 struct sk_buff *skb; 3025 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush)); 3026 3027 skb = nlmsg_new(len, GFP_ATOMIC); 3028 if (skb == NULL) 3029 return -ENOMEM; 3030 3031 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0); 3032 if (nlh == NULL) { 3033 kfree_skb(skb); 3034 return -EMSGSIZE; 3035 } 3036 3037 p = nlmsg_data(nlh); 3038 p->proto = c->data.proto; 3039 3040 nlmsg_end(skb, nlh); 3041 3042 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA); 3043 } 3044 3045 static inline unsigned int xfrm_sa_len(struct xfrm_state *x) 3046 { 3047 unsigned int l = 0; 3048 if (x->aead) 3049 l += nla_total_size(aead_len(x->aead)); 3050 if (x->aalg) { 3051 l += nla_total_size(sizeof(struct xfrm_algo) + 3052 (x->aalg->alg_key_len + 7) / 8); 3053 l += nla_total_size(xfrm_alg_auth_len(x->aalg)); 3054 } 3055 if (x->ealg) 3056 l += nla_total_size(xfrm_alg_len(x->ealg)); 3057 if (x->calg) 3058 l += nla_total_size(sizeof(*x->calg)); 3059 if (x->encap) 3060 l += nla_total_size(sizeof(*x->encap)); 3061 if (x->tfcpad) 3062 l += nla_total_size(sizeof(x->tfcpad)); 3063 if (x->replay_esn) 3064 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn)); 3065 else 3066 l += nla_total_size(sizeof(struct xfrm_replay_state)); 3067 if (x->security) 3068 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) + 3069 x->security->ctx_len); 3070 if (x->coaddr) 3071 l += nla_total_size(sizeof(*x->coaddr)); 3072 if (x->props.extra_flags) 3073 l += nla_total_size(sizeof(x->props.extra_flags)); 3074 if (x->xso.dev) 3075 l += nla_total_size(sizeof(x->xso)); 3076 if (x->props.smark.v | x->props.smark.m) { 3077 l += nla_total_size(sizeof(x->props.smark.v)); 3078 l += nla_total_size(sizeof(x->props.smark.m)); 3079 } 3080 if (x->if_id) 3081 l += nla_total_size(sizeof(x->if_id)); 3082 3083 /* Must count x->lastused as it may become non-zero behind our back. */ 3084 l += nla_total_size_64bit(sizeof(u64)); 3085 3086 if (x->mapping_maxage) 3087 l += nla_total_size(sizeof(x->mapping_maxage)); 3088 3089 return l; 3090 } 3091 3092 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c) 3093 { 3094 struct net *net = xs_net(x); 3095 struct xfrm_usersa_info *p; 3096 struct xfrm_usersa_id *id; 3097 struct nlmsghdr *nlh; 3098 struct sk_buff *skb; 3099 unsigned int len = xfrm_sa_len(x); 3100 unsigned int headlen; 3101 int err; 3102 3103 headlen = sizeof(*p); 3104 if (c->event == XFRM_MSG_DELSA) { 3105 len += nla_total_size(headlen); 3106 headlen = sizeof(*id); 3107 len += nla_total_size(sizeof(struct xfrm_mark)); 3108 } 3109 len += NLMSG_ALIGN(headlen); 3110 3111 skb = nlmsg_new(len, GFP_ATOMIC); 3112 if (skb == NULL) 3113 return -ENOMEM; 3114 3115 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); 3116 err = -EMSGSIZE; 3117 if (nlh == NULL) 3118 goto out_free_skb; 3119 3120 p = nlmsg_data(nlh); 3121 if (c->event == XFRM_MSG_DELSA) { 3122 struct nlattr *attr; 3123 3124 id = nlmsg_data(nlh); 3125 memset(id, 0, sizeof(*id)); 3126 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr)); 3127 id->spi = x->id.spi; 3128 id->family = x->props.family; 3129 id->proto = x->id.proto; 3130 3131 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p)); 3132 err = -EMSGSIZE; 3133 if (attr == NULL) 3134 goto out_free_skb; 3135 3136 p = nla_data(attr); 3137 } 3138 err = copy_to_user_state_extra(x, p, skb); 3139 if (err) 3140 goto out_free_skb; 3141 3142 nlmsg_end(skb, nlh); 3143 3144 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA); 3145 3146 out_free_skb: 3147 kfree_skb(skb); 3148 return err; 3149 } 3150 3151 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c) 3152 { 3153 3154 switch (c->event) { 3155 case XFRM_MSG_EXPIRE: 3156 return xfrm_exp_state_notify(x, c); 3157 case XFRM_MSG_NEWAE: 3158 return xfrm_aevent_state_notify(x, c); 3159 case XFRM_MSG_DELSA: 3160 case XFRM_MSG_UPDSA: 3161 case XFRM_MSG_NEWSA: 3162 return xfrm_notify_sa(x, c); 3163 case XFRM_MSG_FLUSHSA: 3164 return xfrm_notify_sa_flush(c); 3165 default: 3166 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n", 3167 c->event); 3168 break; 3169 } 3170 3171 return 0; 3172 3173 } 3174 3175 static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x, 3176 struct xfrm_policy *xp) 3177 { 3178 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire)) 3179 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 3180 + nla_total_size(sizeof(struct xfrm_mark)) 3181 + nla_total_size(xfrm_user_sec_ctx_size(x->security)) 3182 + userpolicy_type_attrsize(); 3183 } 3184 3185 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x, 3186 struct xfrm_tmpl *xt, struct xfrm_policy *xp) 3187 { 3188 __u32 seq = xfrm_get_acqseq(); 3189 struct xfrm_user_acquire *ua; 3190 struct nlmsghdr *nlh; 3191 int err; 3192 3193 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0); 3194 if (nlh == NULL) 3195 return -EMSGSIZE; 3196 3197 ua = nlmsg_data(nlh); 3198 memcpy(&ua->id, &x->id, sizeof(ua->id)); 3199 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr)); 3200 memcpy(&ua->sel, &x->sel, sizeof(ua->sel)); 3201 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT); 3202 ua->aalgos = xt->aalgos; 3203 ua->ealgos = xt->ealgos; 3204 ua->calgos = xt->calgos; 3205 ua->seq = x->km.seq = seq; 3206 3207 err = copy_to_user_tmpl(xp, skb); 3208 if (!err) 3209 err = copy_to_user_state_sec_ctx(x, skb); 3210 if (!err) 3211 err = copy_to_user_policy_type(xp->type, skb); 3212 if (!err) 3213 err = xfrm_mark_put(skb, &xp->mark); 3214 if (!err) 3215 err = xfrm_if_id_put(skb, xp->if_id); 3216 if (err) { 3217 nlmsg_cancel(skb, nlh); 3218 return err; 3219 } 3220 3221 nlmsg_end(skb, nlh); 3222 return 0; 3223 } 3224 3225 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt, 3226 struct xfrm_policy *xp) 3227 { 3228 struct net *net = xs_net(x); 3229 struct sk_buff *skb; 3230 int err; 3231 3232 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC); 3233 if (skb == NULL) 3234 return -ENOMEM; 3235 3236 err = build_acquire(skb, x, xt, xp); 3237 BUG_ON(err < 0); 3238 3239 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE); 3240 } 3241 3242 /* User gives us xfrm_user_policy_info followed by an array of 0 3243 * or more templates. 3244 */ 3245 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt, 3246 u8 *data, int len, int *dir) 3247 { 3248 struct net *net = sock_net(sk); 3249 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data; 3250 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1); 3251 struct xfrm_policy *xp; 3252 int nr; 3253 3254 switch (sk->sk_family) { 3255 case AF_INET: 3256 if (opt != IP_XFRM_POLICY) { 3257 *dir = -EOPNOTSUPP; 3258 return NULL; 3259 } 3260 break; 3261 #if IS_ENABLED(CONFIG_IPV6) 3262 case AF_INET6: 3263 if (opt != IPV6_XFRM_POLICY) { 3264 *dir = -EOPNOTSUPP; 3265 return NULL; 3266 } 3267 break; 3268 #endif 3269 default: 3270 *dir = -EINVAL; 3271 return NULL; 3272 } 3273 3274 *dir = -EINVAL; 3275 3276 if (len < sizeof(*p) || 3277 verify_newpolicy_info(p)) 3278 return NULL; 3279 3280 nr = ((len - sizeof(*p)) / sizeof(*ut)); 3281 if (validate_tmpl(nr, ut, p->sel.family)) 3282 return NULL; 3283 3284 if (p->dir > XFRM_POLICY_OUT) 3285 return NULL; 3286 3287 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 3288 if (xp == NULL) { 3289 *dir = -ENOBUFS; 3290 return NULL; 3291 } 3292 3293 copy_from_user_policy(xp, p); 3294 xp->type = XFRM_POLICY_TYPE_MAIN; 3295 copy_templates(xp, ut, nr); 3296 3297 *dir = p->dir; 3298 3299 return xp; 3300 } 3301 3302 static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp) 3303 { 3304 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire)) 3305 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 3306 + nla_total_size(xfrm_user_sec_ctx_size(xp->security)) 3307 + nla_total_size(sizeof(struct xfrm_mark)) 3308 + userpolicy_type_attrsize(); 3309 } 3310 3311 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp, 3312 int dir, const struct km_event *c) 3313 { 3314 struct xfrm_user_polexpire *upe; 3315 int hard = c->data.hard; 3316 struct nlmsghdr *nlh; 3317 int err; 3318 3319 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0); 3320 if (nlh == NULL) 3321 return -EMSGSIZE; 3322 3323 upe = nlmsg_data(nlh); 3324 copy_to_user_policy(xp, &upe->pol, dir); 3325 err = copy_to_user_tmpl(xp, skb); 3326 if (!err) 3327 err = copy_to_user_sec_ctx(xp, skb); 3328 if (!err) 3329 err = copy_to_user_policy_type(xp->type, skb); 3330 if (!err) 3331 err = xfrm_mark_put(skb, &xp->mark); 3332 if (!err) 3333 err = xfrm_if_id_put(skb, xp->if_id); 3334 if (err) { 3335 nlmsg_cancel(skb, nlh); 3336 return err; 3337 } 3338 upe->hard = !!hard; 3339 3340 nlmsg_end(skb, nlh); 3341 return 0; 3342 } 3343 3344 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 3345 { 3346 struct net *net = xp_net(xp); 3347 struct sk_buff *skb; 3348 int err; 3349 3350 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC); 3351 if (skb == NULL) 3352 return -ENOMEM; 3353 3354 err = build_polexpire(skb, xp, dir, c); 3355 BUG_ON(err < 0); 3356 3357 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE); 3358 } 3359 3360 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) 3361 { 3362 unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); 3363 struct net *net = xp_net(xp); 3364 struct xfrm_userpolicy_info *p; 3365 struct xfrm_userpolicy_id *id; 3366 struct nlmsghdr *nlh; 3367 struct sk_buff *skb; 3368 unsigned int headlen; 3369 int err; 3370 3371 headlen = sizeof(*p); 3372 if (c->event == XFRM_MSG_DELPOLICY) { 3373 len += nla_total_size(headlen); 3374 headlen = sizeof(*id); 3375 } 3376 len += userpolicy_type_attrsize(); 3377 len += nla_total_size(sizeof(struct xfrm_mark)); 3378 len += NLMSG_ALIGN(headlen); 3379 3380 skb = nlmsg_new(len, GFP_ATOMIC); 3381 if (skb == NULL) 3382 return -ENOMEM; 3383 3384 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); 3385 err = -EMSGSIZE; 3386 if (nlh == NULL) 3387 goto out_free_skb; 3388 3389 p = nlmsg_data(nlh); 3390 if (c->event == XFRM_MSG_DELPOLICY) { 3391 struct nlattr *attr; 3392 3393 id = nlmsg_data(nlh); 3394 memset(id, 0, sizeof(*id)); 3395 id->dir = dir; 3396 if (c->data.byid) 3397 id->index = xp->index; 3398 else 3399 memcpy(&id->sel, &xp->selector, sizeof(id->sel)); 3400 3401 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p)); 3402 err = -EMSGSIZE; 3403 if (attr == NULL) 3404 goto out_free_skb; 3405 3406 p = nla_data(attr); 3407 } 3408 3409 copy_to_user_policy(xp, p, dir); 3410 err = copy_to_user_tmpl(xp, skb); 3411 if (!err) 3412 err = copy_to_user_policy_type(xp->type, skb); 3413 if (!err) 3414 err = xfrm_mark_put(skb, &xp->mark); 3415 if (!err) 3416 err = xfrm_if_id_put(skb, xp->if_id); 3417 if (err) 3418 goto out_free_skb; 3419 3420 nlmsg_end(skb, nlh); 3421 3422 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 3423 3424 out_free_skb: 3425 kfree_skb(skb); 3426 return err; 3427 } 3428 3429 static int xfrm_notify_policy_flush(const struct km_event *c) 3430 { 3431 struct net *net = c->net; 3432 struct nlmsghdr *nlh; 3433 struct sk_buff *skb; 3434 int err; 3435 3436 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC); 3437 if (skb == NULL) 3438 return -ENOMEM; 3439 3440 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0); 3441 err = -EMSGSIZE; 3442 if (nlh == NULL) 3443 goto out_free_skb; 3444 err = copy_to_user_policy_type(c->data.type, skb); 3445 if (err) 3446 goto out_free_skb; 3447 3448 nlmsg_end(skb, nlh); 3449 3450 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 3451 3452 out_free_skb: 3453 kfree_skb(skb); 3454 return err; 3455 } 3456 3457 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 3458 { 3459 3460 switch (c->event) { 3461 case XFRM_MSG_NEWPOLICY: 3462 case XFRM_MSG_UPDPOLICY: 3463 case XFRM_MSG_DELPOLICY: 3464 return xfrm_notify_policy(xp, dir, c); 3465 case XFRM_MSG_FLUSHPOLICY: 3466 return xfrm_notify_policy_flush(c); 3467 case XFRM_MSG_POLEXPIRE: 3468 return xfrm_exp_policy_notify(xp, dir, c); 3469 default: 3470 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n", 3471 c->event); 3472 } 3473 3474 return 0; 3475 3476 } 3477 3478 static inline unsigned int xfrm_report_msgsize(void) 3479 { 3480 return NLMSG_ALIGN(sizeof(struct xfrm_user_report)); 3481 } 3482 3483 static int build_report(struct sk_buff *skb, u8 proto, 3484 struct xfrm_selector *sel, xfrm_address_t *addr) 3485 { 3486 struct xfrm_user_report *ur; 3487 struct nlmsghdr *nlh; 3488 3489 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0); 3490 if (nlh == NULL) 3491 return -EMSGSIZE; 3492 3493 ur = nlmsg_data(nlh); 3494 ur->proto = proto; 3495 memcpy(&ur->sel, sel, sizeof(ur->sel)); 3496 3497 if (addr) { 3498 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr); 3499 if (err) { 3500 nlmsg_cancel(skb, nlh); 3501 return err; 3502 } 3503 } 3504 nlmsg_end(skb, nlh); 3505 return 0; 3506 } 3507 3508 static int xfrm_send_report(struct net *net, u8 proto, 3509 struct xfrm_selector *sel, xfrm_address_t *addr) 3510 { 3511 struct sk_buff *skb; 3512 int err; 3513 3514 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC); 3515 if (skb == NULL) 3516 return -ENOMEM; 3517 3518 err = build_report(skb, proto, sel, addr); 3519 BUG_ON(err < 0); 3520 3521 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT); 3522 } 3523 3524 static inline unsigned int xfrm_mapping_msgsize(void) 3525 { 3526 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping)); 3527 } 3528 3529 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x, 3530 xfrm_address_t *new_saddr, __be16 new_sport) 3531 { 3532 struct xfrm_user_mapping *um; 3533 struct nlmsghdr *nlh; 3534 3535 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0); 3536 if (nlh == NULL) 3537 return -EMSGSIZE; 3538 3539 um = nlmsg_data(nlh); 3540 3541 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr)); 3542 um->id.spi = x->id.spi; 3543 um->id.family = x->props.family; 3544 um->id.proto = x->id.proto; 3545 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr)); 3546 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr)); 3547 um->new_sport = new_sport; 3548 um->old_sport = x->encap->encap_sport; 3549 um->reqid = x->props.reqid; 3550 3551 nlmsg_end(skb, nlh); 3552 return 0; 3553 } 3554 3555 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, 3556 __be16 sport) 3557 { 3558 struct net *net = xs_net(x); 3559 struct sk_buff *skb; 3560 int err; 3561 3562 if (x->id.proto != IPPROTO_ESP) 3563 return -EINVAL; 3564 3565 if (!x->encap) 3566 return -EINVAL; 3567 3568 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC); 3569 if (skb == NULL) 3570 return -ENOMEM; 3571 3572 err = build_mapping(skb, x, ipaddr, sport); 3573 BUG_ON(err < 0); 3574 3575 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING); 3576 } 3577 3578 static bool xfrm_is_alive(const struct km_event *c) 3579 { 3580 return (bool)xfrm_acquire_is_on(c->net); 3581 } 3582 3583 static struct xfrm_mgr netlink_mgr = { 3584 .notify = xfrm_send_state_notify, 3585 .acquire = xfrm_send_acquire, 3586 .compile_policy = xfrm_compile_policy, 3587 .notify_policy = xfrm_send_policy_notify, 3588 .report = xfrm_send_report, 3589 .migrate = xfrm_send_migrate, 3590 .new_mapping = xfrm_send_mapping, 3591 .is_alive = xfrm_is_alive, 3592 }; 3593 3594 static int __net_init xfrm_user_net_init(struct net *net) 3595 { 3596 struct sock *nlsk; 3597 struct netlink_kernel_cfg cfg = { 3598 .groups = XFRMNLGRP_MAX, 3599 .input = xfrm_netlink_rcv, 3600 }; 3601 3602 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg); 3603 if (nlsk == NULL) 3604 return -ENOMEM; 3605 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */ 3606 rcu_assign_pointer(net->xfrm.nlsk, nlsk); 3607 return 0; 3608 } 3609 3610 static void __net_exit xfrm_user_net_pre_exit(struct net *net) 3611 { 3612 RCU_INIT_POINTER(net->xfrm.nlsk, NULL); 3613 } 3614 3615 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list) 3616 { 3617 struct net *net; 3618 3619 list_for_each_entry(net, net_exit_list, exit_list) 3620 netlink_kernel_release(net->xfrm.nlsk_stash); 3621 } 3622 3623 static struct pernet_operations xfrm_user_net_ops = { 3624 .init = xfrm_user_net_init, 3625 .pre_exit = xfrm_user_net_pre_exit, 3626 .exit_batch = xfrm_user_net_exit, 3627 }; 3628 3629 static int __init xfrm_user_init(void) 3630 { 3631 int rv; 3632 3633 printk(KERN_INFO "Initializing XFRM netlink socket\n"); 3634 3635 rv = register_pernet_subsys(&xfrm_user_net_ops); 3636 if (rv < 0) 3637 return rv; 3638 rv = xfrm_register_km(&netlink_mgr); 3639 if (rv < 0) 3640 unregister_pernet_subsys(&xfrm_user_net_ops); 3641 return rv; 3642 } 3643 3644 static void __exit xfrm_user_exit(void) 3645 { 3646 xfrm_unregister_km(&netlink_mgr); 3647 unregister_pernet_subsys(&xfrm_user_net_ops); 3648 } 3649 3650 module_init(xfrm_user_init); 3651 module_exit(xfrm_user_exit); 3652 MODULE_LICENSE("GPL"); 3653 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM); 3654