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_dev_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 if (xso->dir == XFRM_DEV_OFFLOAD_IN) 856 xuo->flags = XFRM_OFFLOAD_INBOUND; 857 858 return 0; 859 } 860 861 static bool xfrm_redact(void) 862 { 863 return IS_ENABLED(CONFIG_SECURITY) && 864 security_locked_down(LOCKDOWN_XFRM_SECRET); 865 } 866 867 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb) 868 { 869 struct xfrm_algo *algo; 870 struct xfrm_algo_auth *ap; 871 struct nlattr *nla; 872 bool redact_secret = xfrm_redact(); 873 874 nla = nla_reserve(skb, XFRMA_ALG_AUTH, 875 sizeof(*algo) + (auth->alg_key_len + 7) / 8); 876 if (!nla) 877 return -EMSGSIZE; 878 algo = nla_data(nla); 879 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name)); 880 881 if (redact_secret && auth->alg_key_len) 882 memset(algo->alg_key, 0, (auth->alg_key_len + 7) / 8); 883 else 884 memcpy(algo->alg_key, auth->alg_key, 885 (auth->alg_key_len + 7) / 8); 886 algo->alg_key_len = auth->alg_key_len; 887 888 nla = nla_reserve(skb, XFRMA_ALG_AUTH_TRUNC, xfrm_alg_auth_len(auth)); 889 if (!nla) 890 return -EMSGSIZE; 891 ap = nla_data(nla); 892 memcpy(ap, auth, sizeof(struct xfrm_algo_auth)); 893 if (redact_secret && auth->alg_key_len) 894 memset(ap->alg_key, 0, (auth->alg_key_len + 7) / 8); 895 else 896 memcpy(ap->alg_key, auth->alg_key, 897 (auth->alg_key_len + 7) / 8); 898 return 0; 899 } 900 901 static int copy_to_user_aead(struct xfrm_algo_aead *aead, struct sk_buff *skb) 902 { 903 struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_AEAD, aead_len(aead)); 904 struct xfrm_algo_aead *ap; 905 bool redact_secret = xfrm_redact(); 906 907 if (!nla) 908 return -EMSGSIZE; 909 910 ap = nla_data(nla); 911 memcpy(ap, aead, sizeof(*aead)); 912 913 if (redact_secret && aead->alg_key_len) 914 memset(ap->alg_key, 0, (aead->alg_key_len + 7) / 8); 915 else 916 memcpy(ap->alg_key, aead->alg_key, 917 (aead->alg_key_len + 7) / 8); 918 return 0; 919 } 920 921 static int copy_to_user_ealg(struct xfrm_algo *ealg, struct sk_buff *skb) 922 { 923 struct xfrm_algo *ap; 924 bool redact_secret = xfrm_redact(); 925 struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_CRYPT, 926 xfrm_alg_len(ealg)); 927 if (!nla) 928 return -EMSGSIZE; 929 930 ap = nla_data(nla); 931 memcpy(ap, ealg, sizeof(*ealg)); 932 933 if (redact_secret && ealg->alg_key_len) 934 memset(ap->alg_key, 0, (ealg->alg_key_len + 7) / 8); 935 else 936 memcpy(ap->alg_key, ealg->alg_key, 937 (ealg->alg_key_len + 7) / 8); 938 939 return 0; 940 } 941 942 static int xfrm_smark_put(struct sk_buff *skb, struct xfrm_mark *m) 943 { 944 int ret = 0; 945 946 if (m->v | m->m) { 947 ret = nla_put_u32(skb, XFRMA_SET_MARK, m->v); 948 if (!ret) 949 ret = nla_put_u32(skb, XFRMA_SET_MARK_MASK, m->m); 950 } 951 return ret; 952 } 953 954 /* Don't change this without updating xfrm_sa_len! */ 955 static int copy_to_user_state_extra(struct xfrm_state *x, 956 struct xfrm_usersa_info *p, 957 struct sk_buff *skb) 958 { 959 int ret = 0; 960 961 copy_to_user_state(x, p); 962 963 if (x->props.extra_flags) { 964 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS, 965 x->props.extra_flags); 966 if (ret) 967 goto out; 968 } 969 970 if (x->coaddr) { 971 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr); 972 if (ret) 973 goto out; 974 } 975 if (x->lastused) { 976 ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused, 977 XFRMA_PAD); 978 if (ret) 979 goto out; 980 } 981 if (x->aead) { 982 ret = copy_to_user_aead(x->aead, skb); 983 if (ret) 984 goto out; 985 } 986 if (x->aalg) { 987 ret = copy_to_user_auth(x->aalg, skb); 988 if (ret) 989 goto out; 990 } 991 if (x->ealg) { 992 ret = copy_to_user_ealg(x->ealg, skb); 993 if (ret) 994 goto out; 995 } 996 if (x->calg) { 997 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg); 998 if (ret) 999 goto out; 1000 } 1001 if (x->encap) { 1002 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap); 1003 if (ret) 1004 goto out; 1005 } 1006 if (x->tfcpad) { 1007 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad); 1008 if (ret) 1009 goto out; 1010 } 1011 ret = xfrm_mark_put(skb, &x->mark); 1012 if (ret) 1013 goto out; 1014 1015 ret = xfrm_smark_put(skb, &x->props.smark); 1016 if (ret) 1017 goto out; 1018 1019 if (x->replay_esn) 1020 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL, 1021 xfrm_replay_state_esn_len(x->replay_esn), 1022 x->replay_esn); 1023 else 1024 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), 1025 &x->replay); 1026 if (ret) 1027 goto out; 1028 if(x->xso.dev) 1029 ret = copy_user_offload(&x->xso, skb); 1030 if (ret) 1031 goto out; 1032 if (x->if_id) { 1033 ret = nla_put_u32(skb, XFRMA_IF_ID, x->if_id); 1034 if (ret) 1035 goto out; 1036 } 1037 if (x->security) { 1038 ret = copy_sec_ctx(x->security, skb); 1039 if (ret) 1040 goto out; 1041 } 1042 if (x->mapping_maxage) 1043 ret = nla_put_u32(skb, XFRMA_MTIMER_THRESH, x->mapping_maxage); 1044 out: 1045 return ret; 1046 } 1047 1048 static int dump_one_state(struct xfrm_state *x, int count, void *ptr) 1049 { 1050 struct xfrm_dump_info *sp = ptr; 1051 struct sk_buff *in_skb = sp->in_skb; 1052 struct sk_buff *skb = sp->out_skb; 1053 struct xfrm_translator *xtr; 1054 struct xfrm_usersa_info *p; 1055 struct nlmsghdr *nlh; 1056 int err; 1057 1058 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, 1059 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags); 1060 if (nlh == NULL) 1061 return -EMSGSIZE; 1062 1063 p = nlmsg_data(nlh); 1064 1065 err = copy_to_user_state_extra(x, p, skb); 1066 if (err) { 1067 nlmsg_cancel(skb, nlh); 1068 return err; 1069 } 1070 nlmsg_end(skb, nlh); 1071 1072 xtr = xfrm_get_translator(); 1073 if (xtr) { 1074 err = xtr->alloc_compat(skb, nlh); 1075 1076 xfrm_put_translator(xtr); 1077 if (err) { 1078 nlmsg_cancel(skb, nlh); 1079 return err; 1080 } 1081 } 1082 1083 return 0; 1084 } 1085 1086 static int xfrm_dump_sa_done(struct netlink_callback *cb) 1087 { 1088 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 1089 struct sock *sk = cb->skb->sk; 1090 struct net *net = sock_net(sk); 1091 1092 if (cb->args[0]) 1093 xfrm_state_walk_done(walk, net); 1094 return 0; 1095 } 1096 1097 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb) 1098 { 1099 struct net *net = sock_net(skb->sk); 1100 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 1101 struct xfrm_dump_info info; 1102 1103 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) > 1104 sizeof(cb->args) - sizeof(cb->args[0])); 1105 1106 info.in_skb = cb->skb; 1107 info.out_skb = skb; 1108 info.nlmsg_seq = cb->nlh->nlmsg_seq; 1109 info.nlmsg_flags = NLM_F_MULTI; 1110 1111 if (!cb->args[0]) { 1112 struct nlattr *attrs[XFRMA_MAX+1]; 1113 struct xfrm_address_filter *filter = NULL; 1114 u8 proto = 0; 1115 int err; 1116 1117 err = nlmsg_parse_deprecated(cb->nlh, 0, attrs, XFRMA_MAX, 1118 xfrma_policy, cb->extack); 1119 if (err < 0) 1120 return err; 1121 1122 if (attrs[XFRMA_ADDRESS_FILTER]) { 1123 filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]), 1124 sizeof(*filter), GFP_KERNEL); 1125 if (filter == NULL) 1126 return -ENOMEM; 1127 } 1128 1129 if (attrs[XFRMA_PROTO]) 1130 proto = nla_get_u8(attrs[XFRMA_PROTO]); 1131 1132 xfrm_state_walk_init(walk, proto, filter); 1133 cb->args[0] = 1; 1134 } 1135 1136 (void) xfrm_state_walk(net, walk, dump_one_state, &info); 1137 1138 return skb->len; 1139 } 1140 1141 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb, 1142 struct xfrm_state *x, u32 seq) 1143 { 1144 struct xfrm_dump_info info; 1145 struct sk_buff *skb; 1146 int err; 1147 1148 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1149 if (!skb) 1150 return ERR_PTR(-ENOMEM); 1151 1152 info.in_skb = in_skb; 1153 info.out_skb = skb; 1154 info.nlmsg_seq = seq; 1155 info.nlmsg_flags = 0; 1156 1157 err = dump_one_state(x, 0, &info); 1158 if (err) { 1159 kfree_skb(skb); 1160 return ERR_PTR(err); 1161 } 1162 1163 return skb; 1164 } 1165 1166 /* A wrapper for nlmsg_multicast() checking that nlsk is still available. 1167 * Must be called with RCU read lock. 1168 */ 1169 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb, 1170 u32 pid, unsigned int group) 1171 { 1172 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk); 1173 struct xfrm_translator *xtr; 1174 1175 if (!nlsk) { 1176 kfree_skb(skb); 1177 return -EPIPE; 1178 } 1179 1180 xtr = xfrm_get_translator(); 1181 if (xtr) { 1182 int err = xtr->alloc_compat(skb, nlmsg_hdr(skb)); 1183 1184 xfrm_put_translator(xtr); 1185 if (err) { 1186 kfree_skb(skb); 1187 return err; 1188 } 1189 } 1190 1191 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC); 1192 } 1193 1194 static inline unsigned int xfrm_spdinfo_msgsize(void) 1195 { 1196 return NLMSG_ALIGN(4) 1197 + nla_total_size(sizeof(struct xfrmu_spdinfo)) 1198 + nla_total_size(sizeof(struct xfrmu_spdhinfo)) 1199 + nla_total_size(sizeof(struct xfrmu_spdhthresh)) 1200 + nla_total_size(sizeof(struct xfrmu_spdhthresh)); 1201 } 1202 1203 static int build_spdinfo(struct sk_buff *skb, struct net *net, 1204 u32 portid, u32 seq, u32 flags) 1205 { 1206 struct xfrmk_spdinfo si; 1207 struct xfrmu_spdinfo spc; 1208 struct xfrmu_spdhinfo sph; 1209 struct xfrmu_spdhthresh spt4, spt6; 1210 struct nlmsghdr *nlh; 1211 int err; 1212 u32 *f; 1213 unsigned lseq; 1214 1215 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0); 1216 if (nlh == NULL) /* shouldn't really happen ... */ 1217 return -EMSGSIZE; 1218 1219 f = nlmsg_data(nlh); 1220 *f = flags; 1221 xfrm_spd_getinfo(net, &si); 1222 spc.incnt = si.incnt; 1223 spc.outcnt = si.outcnt; 1224 spc.fwdcnt = si.fwdcnt; 1225 spc.inscnt = si.inscnt; 1226 spc.outscnt = si.outscnt; 1227 spc.fwdscnt = si.fwdscnt; 1228 sph.spdhcnt = si.spdhcnt; 1229 sph.spdhmcnt = si.spdhmcnt; 1230 1231 do { 1232 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock); 1233 1234 spt4.lbits = net->xfrm.policy_hthresh.lbits4; 1235 spt4.rbits = net->xfrm.policy_hthresh.rbits4; 1236 spt6.lbits = net->xfrm.policy_hthresh.lbits6; 1237 spt6.rbits = net->xfrm.policy_hthresh.rbits6; 1238 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq)); 1239 1240 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc); 1241 if (!err) 1242 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph); 1243 if (!err) 1244 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4); 1245 if (!err) 1246 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6); 1247 if (err) { 1248 nlmsg_cancel(skb, nlh); 1249 return err; 1250 } 1251 1252 nlmsg_end(skb, nlh); 1253 return 0; 1254 } 1255 1256 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1257 struct nlattr **attrs) 1258 { 1259 struct net *net = sock_net(skb->sk); 1260 struct xfrmu_spdhthresh *thresh4 = NULL; 1261 struct xfrmu_spdhthresh *thresh6 = NULL; 1262 1263 /* selector prefixlen thresholds to hash policies */ 1264 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) { 1265 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH]; 1266 1267 if (nla_len(rta) < sizeof(*thresh4)) 1268 return -EINVAL; 1269 thresh4 = nla_data(rta); 1270 if (thresh4->lbits > 32 || thresh4->rbits > 32) 1271 return -EINVAL; 1272 } 1273 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) { 1274 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH]; 1275 1276 if (nla_len(rta) < sizeof(*thresh6)) 1277 return -EINVAL; 1278 thresh6 = nla_data(rta); 1279 if (thresh6->lbits > 128 || thresh6->rbits > 128) 1280 return -EINVAL; 1281 } 1282 1283 if (thresh4 || thresh6) { 1284 write_seqlock(&net->xfrm.policy_hthresh.lock); 1285 if (thresh4) { 1286 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits; 1287 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits; 1288 } 1289 if (thresh6) { 1290 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits; 1291 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits; 1292 } 1293 write_sequnlock(&net->xfrm.policy_hthresh.lock); 1294 1295 xfrm_policy_hash_rebuild(net); 1296 } 1297 1298 return 0; 1299 } 1300 1301 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1302 struct nlattr **attrs) 1303 { 1304 struct net *net = sock_net(skb->sk); 1305 struct sk_buff *r_skb; 1306 u32 *flags = nlmsg_data(nlh); 1307 u32 sportid = NETLINK_CB(skb).portid; 1308 u32 seq = nlh->nlmsg_seq; 1309 int err; 1310 1311 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC); 1312 if (r_skb == NULL) 1313 return -ENOMEM; 1314 1315 err = build_spdinfo(r_skb, net, sportid, seq, *flags); 1316 BUG_ON(err < 0); 1317 1318 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); 1319 } 1320 1321 static inline unsigned int xfrm_sadinfo_msgsize(void) 1322 { 1323 return NLMSG_ALIGN(4) 1324 + nla_total_size(sizeof(struct xfrmu_sadhinfo)) 1325 + nla_total_size(4); /* XFRMA_SAD_CNT */ 1326 } 1327 1328 static int build_sadinfo(struct sk_buff *skb, struct net *net, 1329 u32 portid, u32 seq, u32 flags) 1330 { 1331 struct xfrmk_sadinfo si; 1332 struct xfrmu_sadhinfo sh; 1333 struct nlmsghdr *nlh; 1334 int err; 1335 u32 *f; 1336 1337 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0); 1338 if (nlh == NULL) /* shouldn't really happen ... */ 1339 return -EMSGSIZE; 1340 1341 f = nlmsg_data(nlh); 1342 *f = flags; 1343 xfrm_sad_getinfo(net, &si); 1344 1345 sh.sadhmcnt = si.sadhmcnt; 1346 sh.sadhcnt = si.sadhcnt; 1347 1348 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt); 1349 if (!err) 1350 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh); 1351 if (err) { 1352 nlmsg_cancel(skb, nlh); 1353 return err; 1354 } 1355 1356 nlmsg_end(skb, nlh); 1357 return 0; 1358 } 1359 1360 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1361 struct nlattr **attrs) 1362 { 1363 struct net *net = sock_net(skb->sk); 1364 struct sk_buff *r_skb; 1365 u32 *flags = nlmsg_data(nlh); 1366 u32 sportid = NETLINK_CB(skb).portid; 1367 u32 seq = nlh->nlmsg_seq; 1368 int err; 1369 1370 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC); 1371 if (r_skb == NULL) 1372 return -ENOMEM; 1373 1374 err = build_sadinfo(r_skb, net, sportid, seq, *flags); 1375 BUG_ON(err < 0); 1376 1377 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); 1378 } 1379 1380 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 1381 struct nlattr **attrs) 1382 { 1383 struct net *net = sock_net(skb->sk); 1384 struct xfrm_usersa_id *p = nlmsg_data(nlh); 1385 struct xfrm_state *x; 1386 struct sk_buff *resp_skb; 1387 int err = -ESRCH; 1388 1389 x = xfrm_user_state_lookup(net, p, attrs, &err); 1390 if (x == NULL) 1391 goto out_noput; 1392 1393 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 1394 if (IS_ERR(resp_skb)) { 1395 err = PTR_ERR(resp_skb); 1396 } else { 1397 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); 1398 } 1399 xfrm_state_put(x); 1400 out_noput: 1401 return err; 1402 } 1403 1404 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, 1405 struct nlattr **attrs) 1406 { 1407 struct net *net = sock_net(skb->sk); 1408 struct xfrm_state *x; 1409 struct xfrm_userspi_info *p; 1410 struct xfrm_translator *xtr; 1411 struct sk_buff *resp_skb; 1412 xfrm_address_t *daddr; 1413 int family; 1414 int err; 1415 u32 mark; 1416 struct xfrm_mark m; 1417 u32 if_id = 0; 1418 1419 p = nlmsg_data(nlh); 1420 err = verify_spi_info(p->info.id.proto, p->min, p->max); 1421 if (err) 1422 goto out_noput; 1423 1424 family = p->info.family; 1425 daddr = &p->info.id.daddr; 1426 1427 x = NULL; 1428 1429 mark = xfrm_mark_get(attrs, &m); 1430 1431 if (attrs[XFRMA_IF_ID]) 1432 if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 1433 1434 if (p->info.seq) { 1435 x = xfrm_find_acq_byseq(net, mark, p->info.seq); 1436 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) { 1437 xfrm_state_put(x); 1438 x = NULL; 1439 } 1440 } 1441 1442 if (!x) 1443 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid, 1444 if_id, p->info.id.proto, daddr, 1445 &p->info.saddr, 1, 1446 family); 1447 err = -ENOENT; 1448 if (x == NULL) 1449 goto out_noput; 1450 1451 err = xfrm_alloc_spi(x, p->min, p->max); 1452 if (err) 1453 goto out; 1454 1455 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 1456 if (IS_ERR(resp_skb)) { 1457 err = PTR_ERR(resp_skb); 1458 goto out; 1459 } 1460 1461 xtr = xfrm_get_translator(); 1462 if (xtr) { 1463 err = xtr->alloc_compat(skb, nlmsg_hdr(skb)); 1464 1465 xfrm_put_translator(xtr); 1466 if (err) { 1467 kfree_skb(resp_skb); 1468 goto out; 1469 } 1470 } 1471 1472 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); 1473 1474 out: 1475 xfrm_state_put(x); 1476 out_noput: 1477 return err; 1478 } 1479 1480 static int verify_policy_dir(u8 dir) 1481 { 1482 switch (dir) { 1483 case XFRM_POLICY_IN: 1484 case XFRM_POLICY_OUT: 1485 case XFRM_POLICY_FWD: 1486 break; 1487 1488 default: 1489 return -EINVAL; 1490 } 1491 1492 return 0; 1493 } 1494 1495 static int verify_policy_type(u8 type) 1496 { 1497 switch (type) { 1498 case XFRM_POLICY_TYPE_MAIN: 1499 #ifdef CONFIG_XFRM_SUB_POLICY 1500 case XFRM_POLICY_TYPE_SUB: 1501 #endif 1502 break; 1503 1504 default: 1505 return -EINVAL; 1506 } 1507 1508 return 0; 1509 } 1510 1511 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p) 1512 { 1513 int ret; 1514 1515 switch (p->share) { 1516 case XFRM_SHARE_ANY: 1517 case XFRM_SHARE_SESSION: 1518 case XFRM_SHARE_USER: 1519 case XFRM_SHARE_UNIQUE: 1520 break; 1521 1522 default: 1523 return -EINVAL; 1524 } 1525 1526 switch (p->action) { 1527 case XFRM_POLICY_ALLOW: 1528 case XFRM_POLICY_BLOCK: 1529 break; 1530 1531 default: 1532 return -EINVAL; 1533 } 1534 1535 switch (p->sel.family) { 1536 case AF_INET: 1537 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32) 1538 return -EINVAL; 1539 1540 break; 1541 1542 case AF_INET6: 1543 #if IS_ENABLED(CONFIG_IPV6) 1544 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128) 1545 return -EINVAL; 1546 1547 break; 1548 #else 1549 return -EAFNOSUPPORT; 1550 #endif 1551 1552 default: 1553 return -EINVAL; 1554 } 1555 1556 ret = verify_policy_dir(p->dir); 1557 if (ret) 1558 return ret; 1559 if (p->index && (xfrm_policy_id2dir(p->index) != p->dir)) 1560 return -EINVAL; 1561 1562 return 0; 1563 } 1564 1565 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs) 1566 { 1567 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1568 struct xfrm_user_sec_ctx *uctx; 1569 1570 if (!rt) 1571 return 0; 1572 1573 uctx = nla_data(rt); 1574 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL); 1575 } 1576 1577 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut, 1578 int nr) 1579 { 1580 int i; 1581 1582 xp->xfrm_nr = nr; 1583 for (i = 0; i < nr; i++, ut++) { 1584 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 1585 1586 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id)); 1587 memcpy(&t->saddr, &ut->saddr, 1588 sizeof(xfrm_address_t)); 1589 t->reqid = ut->reqid; 1590 t->mode = ut->mode; 1591 t->share = ut->share; 1592 t->optional = ut->optional; 1593 t->aalgos = ut->aalgos; 1594 t->ealgos = ut->ealgos; 1595 t->calgos = ut->calgos; 1596 /* If all masks are ~0, then we allow all algorithms. */ 1597 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos); 1598 t->encap_family = ut->family; 1599 } 1600 } 1601 1602 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family) 1603 { 1604 u16 prev_family; 1605 int i; 1606 1607 if (nr > XFRM_MAX_DEPTH) 1608 return -EINVAL; 1609 1610 prev_family = family; 1611 1612 for (i = 0; i < nr; i++) { 1613 /* We never validated the ut->family value, so many 1614 * applications simply leave it at zero. The check was 1615 * never made and ut->family was ignored because all 1616 * templates could be assumed to have the same family as 1617 * the policy itself. Now that we will have ipv4-in-ipv6 1618 * and ipv6-in-ipv4 tunnels, this is no longer true. 1619 */ 1620 if (!ut[i].family) 1621 ut[i].family = family; 1622 1623 switch (ut[i].mode) { 1624 case XFRM_MODE_TUNNEL: 1625 case XFRM_MODE_BEET: 1626 break; 1627 default: 1628 if (ut[i].family != prev_family) 1629 return -EINVAL; 1630 break; 1631 } 1632 if (ut[i].mode >= XFRM_MODE_MAX) 1633 return -EINVAL; 1634 1635 prev_family = ut[i].family; 1636 1637 switch (ut[i].family) { 1638 case AF_INET: 1639 break; 1640 #if IS_ENABLED(CONFIG_IPV6) 1641 case AF_INET6: 1642 break; 1643 #endif 1644 default: 1645 return -EINVAL; 1646 } 1647 1648 if (!xfrm_id_proto_valid(ut[i].id.proto)) 1649 return -EINVAL; 1650 } 1651 1652 return 0; 1653 } 1654 1655 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs) 1656 { 1657 struct nlattr *rt = attrs[XFRMA_TMPL]; 1658 1659 if (!rt) { 1660 pol->xfrm_nr = 0; 1661 } else { 1662 struct xfrm_user_tmpl *utmpl = nla_data(rt); 1663 int nr = nla_len(rt) / sizeof(*utmpl); 1664 int err; 1665 1666 err = validate_tmpl(nr, utmpl, pol->family); 1667 if (err) 1668 return err; 1669 1670 copy_templates(pol, utmpl, nr); 1671 } 1672 return 0; 1673 } 1674 1675 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs) 1676 { 1677 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE]; 1678 struct xfrm_userpolicy_type *upt; 1679 u8 type = XFRM_POLICY_TYPE_MAIN; 1680 int err; 1681 1682 if (rt) { 1683 upt = nla_data(rt); 1684 type = upt->type; 1685 } 1686 1687 err = verify_policy_type(type); 1688 if (err) 1689 return err; 1690 1691 *tp = type; 1692 return 0; 1693 } 1694 1695 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p) 1696 { 1697 xp->priority = p->priority; 1698 xp->index = p->index; 1699 memcpy(&xp->selector, &p->sel, sizeof(xp->selector)); 1700 memcpy(&xp->lft, &p->lft, sizeof(xp->lft)); 1701 xp->action = p->action; 1702 xp->flags = p->flags; 1703 xp->family = p->sel.family; 1704 /* XXX xp->share = p->share; */ 1705 } 1706 1707 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir) 1708 { 1709 memset(p, 0, sizeof(*p)); 1710 memcpy(&p->sel, &xp->selector, sizeof(p->sel)); 1711 memcpy(&p->lft, &xp->lft, sizeof(p->lft)); 1712 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft)); 1713 p->priority = xp->priority; 1714 p->index = xp->index; 1715 p->sel.family = xp->family; 1716 p->dir = dir; 1717 p->action = xp->action; 1718 p->flags = xp->flags; 1719 p->share = XFRM_SHARE_ANY; /* XXX xp->share */ 1720 } 1721 1722 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp) 1723 { 1724 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL); 1725 int err; 1726 1727 if (!xp) { 1728 *errp = -ENOMEM; 1729 return NULL; 1730 } 1731 1732 copy_from_user_policy(xp, p); 1733 1734 err = copy_from_user_policy_type(&xp->type, attrs); 1735 if (err) 1736 goto error; 1737 1738 if (!(err = copy_from_user_tmpl(xp, attrs))) 1739 err = copy_from_user_sec_ctx(xp, attrs); 1740 if (err) 1741 goto error; 1742 1743 xfrm_mark_get(attrs, &xp->mark); 1744 1745 if (attrs[XFRMA_IF_ID]) 1746 xp->if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 1747 1748 return xp; 1749 error: 1750 *errp = err; 1751 xp->walk.dead = 1; 1752 xfrm_policy_destroy(xp); 1753 return NULL; 1754 } 1755 1756 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1757 struct nlattr **attrs) 1758 { 1759 struct net *net = sock_net(skb->sk); 1760 struct xfrm_userpolicy_info *p = nlmsg_data(nlh); 1761 struct xfrm_policy *xp; 1762 struct km_event c; 1763 int err; 1764 int excl; 1765 1766 err = verify_newpolicy_info(p); 1767 if (err) 1768 return err; 1769 err = verify_sec_ctx_len(attrs); 1770 if (err) 1771 return err; 1772 1773 xp = xfrm_policy_construct(net, p, attrs, &err); 1774 if (!xp) 1775 return err; 1776 1777 /* shouldn't excl be based on nlh flags?? 1778 * Aha! this is anti-netlink really i.e more pfkey derived 1779 * in netlink excl is a flag and you wouldn't need 1780 * a type XFRM_MSG_UPDPOLICY - JHS */ 1781 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY; 1782 err = xfrm_policy_insert(p->dir, xp, excl); 1783 xfrm_audit_policy_add(xp, err ? 0 : 1, true); 1784 1785 if (err) { 1786 security_xfrm_policy_free(xp->security); 1787 kfree(xp); 1788 return err; 1789 } 1790 1791 c.event = nlh->nlmsg_type; 1792 c.seq = nlh->nlmsg_seq; 1793 c.portid = nlh->nlmsg_pid; 1794 km_policy_notify(xp, p->dir, &c); 1795 1796 xfrm_pol_put(xp); 1797 1798 return 0; 1799 } 1800 1801 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb) 1802 { 1803 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH]; 1804 int i; 1805 1806 if (xp->xfrm_nr == 0) 1807 return 0; 1808 1809 for (i = 0; i < xp->xfrm_nr; i++) { 1810 struct xfrm_user_tmpl *up = &vec[i]; 1811 struct xfrm_tmpl *kp = &xp->xfrm_vec[i]; 1812 1813 memset(up, 0, sizeof(*up)); 1814 memcpy(&up->id, &kp->id, sizeof(up->id)); 1815 up->family = kp->encap_family; 1816 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr)); 1817 up->reqid = kp->reqid; 1818 up->mode = kp->mode; 1819 up->share = kp->share; 1820 up->optional = kp->optional; 1821 up->aalgos = kp->aalgos; 1822 up->ealgos = kp->ealgos; 1823 up->calgos = kp->calgos; 1824 } 1825 1826 return nla_put(skb, XFRMA_TMPL, 1827 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec); 1828 } 1829 1830 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb) 1831 { 1832 if (x->security) { 1833 return copy_sec_ctx(x->security, skb); 1834 } 1835 return 0; 1836 } 1837 1838 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb) 1839 { 1840 if (xp->security) 1841 return copy_sec_ctx(xp->security, skb); 1842 return 0; 1843 } 1844 static inline unsigned int userpolicy_type_attrsize(void) 1845 { 1846 #ifdef CONFIG_XFRM_SUB_POLICY 1847 return nla_total_size(sizeof(struct xfrm_userpolicy_type)); 1848 #else 1849 return 0; 1850 #endif 1851 } 1852 1853 #ifdef CONFIG_XFRM_SUB_POLICY 1854 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1855 { 1856 struct xfrm_userpolicy_type upt; 1857 1858 /* Sadly there are two holes in struct xfrm_userpolicy_type */ 1859 memset(&upt, 0, sizeof(upt)); 1860 upt.type = type; 1861 1862 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt); 1863 } 1864 1865 #else 1866 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1867 { 1868 return 0; 1869 } 1870 #endif 1871 1872 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr) 1873 { 1874 struct xfrm_dump_info *sp = ptr; 1875 struct xfrm_userpolicy_info *p; 1876 struct sk_buff *in_skb = sp->in_skb; 1877 struct sk_buff *skb = sp->out_skb; 1878 struct xfrm_translator *xtr; 1879 struct nlmsghdr *nlh; 1880 int err; 1881 1882 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, 1883 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags); 1884 if (nlh == NULL) 1885 return -EMSGSIZE; 1886 1887 p = nlmsg_data(nlh); 1888 copy_to_user_policy(xp, p, dir); 1889 err = copy_to_user_tmpl(xp, skb); 1890 if (!err) 1891 err = copy_to_user_sec_ctx(xp, skb); 1892 if (!err) 1893 err = copy_to_user_policy_type(xp->type, skb); 1894 if (!err) 1895 err = xfrm_mark_put(skb, &xp->mark); 1896 if (!err) 1897 err = xfrm_if_id_put(skb, xp->if_id); 1898 if (err) { 1899 nlmsg_cancel(skb, nlh); 1900 return err; 1901 } 1902 nlmsg_end(skb, nlh); 1903 1904 xtr = xfrm_get_translator(); 1905 if (xtr) { 1906 err = xtr->alloc_compat(skb, nlh); 1907 1908 xfrm_put_translator(xtr); 1909 if (err) { 1910 nlmsg_cancel(skb, nlh); 1911 return err; 1912 } 1913 } 1914 1915 return 0; 1916 } 1917 1918 static int xfrm_dump_policy_done(struct netlink_callback *cb) 1919 { 1920 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args; 1921 struct net *net = sock_net(cb->skb->sk); 1922 1923 xfrm_policy_walk_done(walk, net); 1924 return 0; 1925 } 1926 1927 static int xfrm_dump_policy_start(struct netlink_callback *cb) 1928 { 1929 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args; 1930 1931 BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args)); 1932 1933 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY); 1934 return 0; 1935 } 1936 1937 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb) 1938 { 1939 struct net *net = sock_net(skb->sk); 1940 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args; 1941 struct xfrm_dump_info info; 1942 1943 info.in_skb = cb->skb; 1944 info.out_skb = skb; 1945 info.nlmsg_seq = cb->nlh->nlmsg_seq; 1946 info.nlmsg_flags = NLM_F_MULTI; 1947 1948 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info); 1949 1950 return skb->len; 1951 } 1952 1953 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb, 1954 struct xfrm_policy *xp, 1955 int dir, u32 seq) 1956 { 1957 struct xfrm_dump_info info; 1958 struct sk_buff *skb; 1959 int err; 1960 1961 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1962 if (!skb) 1963 return ERR_PTR(-ENOMEM); 1964 1965 info.in_skb = in_skb; 1966 info.out_skb = skb; 1967 info.nlmsg_seq = seq; 1968 info.nlmsg_flags = 0; 1969 1970 err = dump_one_policy(xp, dir, 0, &info); 1971 if (err) { 1972 kfree_skb(skb); 1973 return ERR_PTR(err); 1974 } 1975 1976 return skb; 1977 } 1978 1979 static int xfrm_notify_userpolicy(struct net *net) 1980 { 1981 struct xfrm_userpolicy_default *up; 1982 int len = NLMSG_ALIGN(sizeof(*up)); 1983 struct nlmsghdr *nlh; 1984 struct sk_buff *skb; 1985 int err; 1986 1987 skb = nlmsg_new(len, GFP_ATOMIC); 1988 if (skb == NULL) 1989 return -ENOMEM; 1990 1991 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_GETDEFAULT, sizeof(*up), 0); 1992 if (nlh == NULL) { 1993 kfree_skb(skb); 1994 return -EMSGSIZE; 1995 } 1996 1997 up = nlmsg_data(nlh); 1998 up->in = net->xfrm.policy_default[XFRM_POLICY_IN]; 1999 up->fwd = net->xfrm.policy_default[XFRM_POLICY_FWD]; 2000 up->out = net->xfrm.policy_default[XFRM_POLICY_OUT]; 2001 2002 nlmsg_end(skb, nlh); 2003 2004 rcu_read_lock(); 2005 err = xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 2006 rcu_read_unlock(); 2007 2008 return err; 2009 } 2010 2011 static bool xfrm_userpolicy_is_valid(__u8 policy) 2012 { 2013 return policy == XFRM_USERPOLICY_BLOCK || 2014 policy == XFRM_USERPOLICY_ACCEPT; 2015 } 2016 2017 static int xfrm_set_default(struct sk_buff *skb, struct nlmsghdr *nlh, 2018 struct nlattr **attrs) 2019 { 2020 struct net *net = sock_net(skb->sk); 2021 struct xfrm_userpolicy_default *up = nlmsg_data(nlh); 2022 2023 if (xfrm_userpolicy_is_valid(up->in)) 2024 net->xfrm.policy_default[XFRM_POLICY_IN] = up->in; 2025 2026 if (xfrm_userpolicy_is_valid(up->fwd)) 2027 net->xfrm.policy_default[XFRM_POLICY_FWD] = up->fwd; 2028 2029 if (xfrm_userpolicy_is_valid(up->out)) 2030 net->xfrm.policy_default[XFRM_POLICY_OUT] = up->out; 2031 2032 rt_genid_bump_all(net); 2033 2034 xfrm_notify_userpolicy(net); 2035 return 0; 2036 } 2037 2038 static int xfrm_get_default(struct sk_buff *skb, struct nlmsghdr *nlh, 2039 struct nlattr **attrs) 2040 { 2041 struct sk_buff *r_skb; 2042 struct nlmsghdr *r_nlh; 2043 struct net *net = sock_net(skb->sk); 2044 struct xfrm_userpolicy_default *r_up; 2045 int len = NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_default)); 2046 u32 portid = NETLINK_CB(skb).portid; 2047 u32 seq = nlh->nlmsg_seq; 2048 2049 r_skb = nlmsg_new(len, GFP_ATOMIC); 2050 if (!r_skb) 2051 return -ENOMEM; 2052 2053 r_nlh = nlmsg_put(r_skb, portid, seq, XFRM_MSG_GETDEFAULT, sizeof(*r_up), 0); 2054 if (!r_nlh) { 2055 kfree_skb(r_skb); 2056 return -EMSGSIZE; 2057 } 2058 2059 r_up = nlmsg_data(r_nlh); 2060 r_up->in = net->xfrm.policy_default[XFRM_POLICY_IN]; 2061 r_up->fwd = net->xfrm.policy_default[XFRM_POLICY_FWD]; 2062 r_up->out = net->xfrm.policy_default[XFRM_POLICY_OUT]; 2063 nlmsg_end(r_skb, r_nlh); 2064 2065 return nlmsg_unicast(net->xfrm.nlsk, r_skb, portid); 2066 } 2067 2068 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 2069 struct nlattr **attrs) 2070 { 2071 struct net *net = sock_net(skb->sk); 2072 struct xfrm_policy *xp; 2073 struct xfrm_userpolicy_id *p; 2074 u8 type = XFRM_POLICY_TYPE_MAIN; 2075 int err; 2076 struct km_event c; 2077 int delete; 2078 struct xfrm_mark m; 2079 u32 if_id = 0; 2080 2081 p = nlmsg_data(nlh); 2082 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY; 2083 2084 err = copy_from_user_policy_type(&type, attrs); 2085 if (err) 2086 return err; 2087 2088 err = verify_policy_dir(p->dir); 2089 if (err) 2090 return err; 2091 2092 if (attrs[XFRMA_IF_ID]) 2093 if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 2094 2095 xfrm_mark_get(attrs, &m); 2096 2097 if (p->index) 2098 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir, 2099 p->index, delete, &err); 2100 else { 2101 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 2102 struct xfrm_sec_ctx *ctx; 2103 2104 err = verify_sec_ctx_len(attrs); 2105 if (err) 2106 return err; 2107 2108 ctx = NULL; 2109 if (rt) { 2110 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 2111 2112 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); 2113 if (err) 2114 return err; 2115 } 2116 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir, 2117 &p->sel, ctx, delete, &err); 2118 security_xfrm_policy_free(ctx); 2119 } 2120 if (xp == NULL) 2121 return -ENOENT; 2122 2123 if (!delete) { 2124 struct sk_buff *resp_skb; 2125 2126 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq); 2127 if (IS_ERR(resp_skb)) { 2128 err = PTR_ERR(resp_skb); 2129 } else { 2130 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, 2131 NETLINK_CB(skb).portid); 2132 } 2133 } else { 2134 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 2135 2136 if (err != 0) 2137 goto out; 2138 2139 c.data.byid = p->index; 2140 c.event = nlh->nlmsg_type; 2141 c.seq = nlh->nlmsg_seq; 2142 c.portid = nlh->nlmsg_pid; 2143 km_policy_notify(xp, p->dir, &c); 2144 } 2145 2146 out: 2147 xfrm_pol_put(xp); 2148 return err; 2149 } 2150 2151 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 2152 struct nlattr **attrs) 2153 { 2154 struct net *net = sock_net(skb->sk); 2155 struct km_event c; 2156 struct xfrm_usersa_flush *p = nlmsg_data(nlh); 2157 int err; 2158 2159 err = xfrm_state_flush(net, p->proto, true, false); 2160 if (err) { 2161 if (err == -ESRCH) /* empty table */ 2162 return 0; 2163 return err; 2164 } 2165 c.data.proto = p->proto; 2166 c.event = nlh->nlmsg_type; 2167 c.seq = nlh->nlmsg_seq; 2168 c.portid = nlh->nlmsg_pid; 2169 c.net = net; 2170 km_state_notify(NULL, &c); 2171 2172 return 0; 2173 } 2174 2175 static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x) 2176 { 2177 unsigned int replay_size = x->replay_esn ? 2178 xfrm_replay_state_esn_len(x->replay_esn) : 2179 sizeof(struct xfrm_replay_state); 2180 2181 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id)) 2182 + nla_total_size(replay_size) 2183 + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur)) 2184 + nla_total_size(sizeof(struct xfrm_mark)) 2185 + nla_total_size(4) /* XFRM_AE_RTHR */ 2186 + nla_total_size(4); /* XFRM_AE_ETHR */ 2187 } 2188 2189 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 2190 { 2191 struct xfrm_aevent_id *id; 2192 struct nlmsghdr *nlh; 2193 int err; 2194 2195 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0); 2196 if (nlh == NULL) 2197 return -EMSGSIZE; 2198 2199 id = nlmsg_data(nlh); 2200 memset(&id->sa_id, 0, sizeof(id->sa_id)); 2201 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr)); 2202 id->sa_id.spi = x->id.spi; 2203 id->sa_id.family = x->props.family; 2204 id->sa_id.proto = x->id.proto; 2205 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr)); 2206 id->reqid = x->props.reqid; 2207 id->flags = c->data.aevent; 2208 2209 if (x->replay_esn) { 2210 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL, 2211 xfrm_replay_state_esn_len(x->replay_esn), 2212 x->replay_esn); 2213 } else { 2214 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), 2215 &x->replay); 2216 } 2217 if (err) 2218 goto out_cancel; 2219 err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft, 2220 XFRMA_PAD); 2221 if (err) 2222 goto out_cancel; 2223 2224 if (id->flags & XFRM_AE_RTHR) { 2225 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff); 2226 if (err) 2227 goto out_cancel; 2228 } 2229 if (id->flags & XFRM_AE_ETHR) { 2230 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH, 2231 x->replay_maxage * 10 / HZ); 2232 if (err) 2233 goto out_cancel; 2234 } 2235 err = xfrm_mark_put(skb, &x->mark); 2236 if (err) 2237 goto out_cancel; 2238 2239 err = xfrm_if_id_put(skb, x->if_id); 2240 if (err) 2241 goto out_cancel; 2242 2243 nlmsg_end(skb, nlh); 2244 return 0; 2245 2246 out_cancel: 2247 nlmsg_cancel(skb, nlh); 2248 return err; 2249 } 2250 2251 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 2252 struct nlattr **attrs) 2253 { 2254 struct net *net = sock_net(skb->sk); 2255 struct xfrm_state *x; 2256 struct sk_buff *r_skb; 2257 int err; 2258 struct km_event c; 2259 u32 mark; 2260 struct xfrm_mark m; 2261 struct xfrm_aevent_id *p = nlmsg_data(nlh); 2262 struct xfrm_usersa_id *id = &p->sa_id; 2263 2264 mark = xfrm_mark_get(attrs, &m); 2265 2266 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family); 2267 if (x == NULL) 2268 return -ESRCH; 2269 2270 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 2271 if (r_skb == NULL) { 2272 xfrm_state_put(x); 2273 return -ENOMEM; 2274 } 2275 2276 /* 2277 * XXX: is this lock really needed - none of the other 2278 * gets lock (the concern is things getting updated 2279 * while we are still reading) - jhs 2280 */ 2281 spin_lock_bh(&x->lock); 2282 c.data.aevent = p->flags; 2283 c.seq = nlh->nlmsg_seq; 2284 c.portid = nlh->nlmsg_pid; 2285 2286 err = build_aevent(r_skb, x, &c); 2287 BUG_ON(err < 0); 2288 2289 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid); 2290 spin_unlock_bh(&x->lock); 2291 xfrm_state_put(x); 2292 return err; 2293 } 2294 2295 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 2296 struct nlattr **attrs) 2297 { 2298 struct net *net = sock_net(skb->sk); 2299 struct xfrm_state *x; 2300 struct km_event c; 2301 int err = -EINVAL; 2302 u32 mark = 0; 2303 struct xfrm_mark m; 2304 struct xfrm_aevent_id *p = nlmsg_data(nlh); 2305 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 2306 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL]; 2307 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 2308 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; 2309 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; 2310 2311 if (!lt && !rp && !re && !et && !rt) 2312 return err; 2313 2314 /* pedantic mode - thou shalt sayeth replaceth */ 2315 if (!(nlh->nlmsg_flags&NLM_F_REPLACE)) 2316 return err; 2317 2318 mark = xfrm_mark_get(attrs, &m); 2319 2320 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family); 2321 if (x == NULL) 2322 return -ESRCH; 2323 2324 if (x->km.state != XFRM_STATE_VALID) 2325 goto out; 2326 2327 err = xfrm_replay_verify_len(x->replay_esn, re); 2328 if (err) 2329 goto out; 2330 2331 spin_lock_bh(&x->lock); 2332 xfrm_update_ae_params(x, attrs, 1); 2333 spin_unlock_bh(&x->lock); 2334 2335 c.event = nlh->nlmsg_type; 2336 c.seq = nlh->nlmsg_seq; 2337 c.portid = nlh->nlmsg_pid; 2338 c.data.aevent = XFRM_AE_CU; 2339 km_state_notify(x, &c); 2340 err = 0; 2341 out: 2342 xfrm_state_put(x); 2343 return err; 2344 } 2345 2346 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 2347 struct nlattr **attrs) 2348 { 2349 struct net *net = sock_net(skb->sk); 2350 struct km_event c; 2351 u8 type = XFRM_POLICY_TYPE_MAIN; 2352 int err; 2353 2354 err = copy_from_user_policy_type(&type, attrs); 2355 if (err) 2356 return err; 2357 2358 err = xfrm_policy_flush(net, type, true); 2359 if (err) { 2360 if (err == -ESRCH) /* empty table */ 2361 return 0; 2362 return err; 2363 } 2364 2365 c.data.type = type; 2366 c.event = nlh->nlmsg_type; 2367 c.seq = nlh->nlmsg_seq; 2368 c.portid = nlh->nlmsg_pid; 2369 c.net = net; 2370 km_policy_notify(NULL, 0, &c); 2371 return 0; 2372 } 2373 2374 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 2375 struct nlattr **attrs) 2376 { 2377 struct net *net = sock_net(skb->sk); 2378 struct xfrm_policy *xp; 2379 struct xfrm_user_polexpire *up = nlmsg_data(nlh); 2380 struct xfrm_userpolicy_info *p = &up->pol; 2381 u8 type = XFRM_POLICY_TYPE_MAIN; 2382 int err = -ENOENT; 2383 struct xfrm_mark m; 2384 u32 if_id = 0; 2385 2386 err = copy_from_user_policy_type(&type, attrs); 2387 if (err) 2388 return err; 2389 2390 err = verify_policy_dir(p->dir); 2391 if (err) 2392 return err; 2393 2394 if (attrs[XFRMA_IF_ID]) 2395 if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 2396 2397 xfrm_mark_get(attrs, &m); 2398 2399 if (p->index) 2400 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir, p->index, 2401 0, &err); 2402 else { 2403 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 2404 struct xfrm_sec_ctx *ctx; 2405 2406 err = verify_sec_ctx_len(attrs); 2407 if (err) 2408 return err; 2409 2410 ctx = NULL; 2411 if (rt) { 2412 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 2413 2414 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); 2415 if (err) 2416 return err; 2417 } 2418 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir, 2419 &p->sel, ctx, 0, &err); 2420 security_xfrm_policy_free(ctx); 2421 } 2422 if (xp == NULL) 2423 return -ENOENT; 2424 2425 if (unlikely(xp->walk.dead)) 2426 goto out; 2427 2428 err = 0; 2429 if (up->hard) { 2430 xfrm_policy_delete(xp, p->dir); 2431 xfrm_audit_policy_delete(xp, 1, true); 2432 } 2433 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid); 2434 2435 out: 2436 xfrm_pol_put(xp); 2437 return err; 2438 } 2439 2440 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 2441 struct nlattr **attrs) 2442 { 2443 struct net *net = sock_net(skb->sk); 2444 struct xfrm_state *x; 2445 int err; 2446 struct xfrm_user_expire *ue = nlmsg_data(nlh); 2447 struct xfrm_usersa_info *p = &ue->state; 2448 struct xfrm_mark m; 2449 u32 mark = xfrm_mark_get(attrs, &m); 2450 2451 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family); 2452 2453 err = -ENOENT; 2454 if (x == NULL) 2455 return err; 2456 2457 spin_lock_bh(&x->lock); 2458 err = -EINVAL; 2459 if (x->km.state != XFRM_STATE_VALID) 2460 goto out; 2461 km_state_expired(x, ue->hard, nlh->nlmsg_pid); 2462 2463 if (ue->hard) { 2464 __xfrm_state_delete(x); 2465 xfrm_audit_state_delete(x, 1, true); 2466 } 2467 err = 0; 2468 out: 2469 spin_unlock_bh(&x->lock); 2470 xfrm_state_put(x); 2471 return err; 2472 } 2473 2474 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, 2475 struct nlattr **attrs) 2476 { 2477 struct net *net = sock_net(skb->sk); 2478 struct xfrm_policy *xp; 2479 struct xfrm_user_tmpl *ut; 2480 int i; 2481 struct nlattr *rt = attrs[XFRMA_TMPL]; 2482 struct xfrm_mark mark; 2483 2484 struct xfrm_user_acquire *ua = nlmsg_data(nlh); 2485 struct xfrm_state *x = xfrm_state_alloc(net); 2486 int err = -ENOMEM; 2487 2488 if (!x) 2489 goto nomem; 2490 2491 xfrm_mark_get(attrs, &mark); 2492 2493 err = verify_newpolicy_info(&ua->policy); 2494 if (err) 2495 goto free_state; 2496 err = verify_sec_ctx_len(attrs); 2497 if (err) 2498 goto free_state; 2499 2500 /* build an XP */ 2501 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err); 2502 if (!xp) 2503 goto free_state; 2504 2505 memcpy(&x->id, &ua->id, sizeof(ua->id)); 2506 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr)); 2507 memcpy(&x->sel, &ua->sel, sizeof(ua->sel)); 2508 xp->mark.m = x->mark.m = mark.m; 2509 xp->mark.v = x->mark.v = mark.v; 2510 ut = nla_data(rt); 2511 /* extract the templates and for each call km_key */ 2512 for (i = 0; i < xp->xfrm_nr; i++, ut++) { 2513 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 2514 memcpy(&x->id, &t->id, sizeof(x->id)); 2515 x->props.mode = t->mode; 2516 x->props.reqid = t->reqid; 2517 x->props.family = ut->family; 2518 t->aalgos = ua->aalgos; 2519 t->ealgos = ua->ealgos; 2520 t->calgos = ua->calgos; 2521 err = km_query(x, t, xp); 2522 2523 } 2524 2525 xfrm_state_free(x); 2526 kfree(xp); 2527 2528 return 0; 2529 2530 free_state: 2531 xfrm_state_free(x); 2532 nomem: 2533 return err; 2534 } 2535 2536 #ifdef CONFIG_XFRM_MIGRATE 2537 static int copy_from_user_migrate(struct xfrm_migrate *ma, 2538 struct xfrm_kmaddress *k, 2539 struct nlattr **attrs, int *num) 2540 { 2541 struct nlattr *rt = attrs[XFRMA_MIGRATE]; 2542 struct xfrm_user_migrate *um; 2543 int i, num_migrate; 2544 2545 if (k != NULL) { 2546 struct xfrm_user_kmaddress *uk; 2547 2548 uk = nla_data(attrs[XFRMA_KMADDRESS]); 2549 memcpy(&k->local, &uk->local, sizeof(k->local)); 2550 memcpy(&k->remote, &uk->remote, sizeof(k->remote)); 2551 k->family = uk->family; 2552 k->reserved = uk->reserved; 2553 } 2554 2555 um = nla_data(rt); 2556 num_migrate = nla_len(rt) / sizeof(*um); 2557 2558 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH) 2559 return -EINVAL; 2560 2561 for (i = 0; i < num_migrate; i++, um++, ma++) { 2562 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr)); 2563 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr)); 2564 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr)); 2565 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr)); 2566 2567 ma->proto = um->proto; 2568 ma->mode = um->mode; 2569 ma->reqid = um->reqid; 2570 2571 ma->old_family = um->old_family; 2572 ma->new_family = um->new_family; 2573 } 2574 2575 *num = i; 2576 return 0; 2577 } 2578 2579 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 2580 struct nlattr **attrs) 2581 { 2582 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh); 2583 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 2584 struct xfrm_kmaddress km, *kmp; 2585 u8 type; 2586 int err; 2587 int n = 0; 2588 struct net *net = sock_net(skb->sk); 2589 struct xfrm_encap_tmpl *encap = NULL; 2590 u32 if_id = 0; 2591 2592 if (attrs[XFRMA_MIGRATE] == NULL) 2593 return -EINVAL; 2594 2595 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL; 2596 2597 err = copy_from_user_policy_type(&type, attrs); 2598 if (err) 2599 return err; 2600 2601 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n); 2602 if (err) 2603 return err; 2604 2605 if (!n) 2606 return 0; 2607 2608 if (attrs[XFRMA_ENCAP]) { 2609 encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]), 2610 sizeof(*encap), GFP_KERNEL); 2611 if (!encap) 2612 return -ENOMEM; 2613 } 2614 2615 if (attrs[XFRMA_IF_ID]) 2616 if_id = nla_get_u32(attrs[XFRMA_IF_ID]); 2617 2618 err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap, if_id); 2619 2620 kfree(encap); 2621 2622 return err; 2623 } 2624 #else 2625 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 2626 struct nlattr **attrs) 2627 { 2628 return -ENOPROTOOPT; 2629 } 2630 #endif 2631 2632 #ifdef CONFIG_XFRM_MIGRATE 2633 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb) 2634 { 2635 struct xfrm_user_migrate um; 2636 2637 memset(&um, 0, sizeof(um)); 2638 um.proto = m->proto; 2639 um.mode = m->mode; 2640 um.reqid = m->reqid; 2641 um.old_family = m->old_family; 2642 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr)); 2643 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr)); 2644 um.new_family = m->new_family; 2645 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr)); 2646 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr)); 2647 2648 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um); 2649 } 2650 2651 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb) 2652 { 2653 struct xfrm_user_kmaddress uk; 2654 2655 memset(&uk, 0, sizeof(uk)); 2656 uk.family = k->family; 2657 uk.reserved = k->reserved; 2658 memcpy(&uk.local, &k->local, sizeof(uk.local)); 2659 memcpy(&uk.remote, &k->remote, sizeof(uk.remote)); 2660 2661 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk); 2662 } 2663 2664 static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma, 2665 int with_encp) 2666 { 2667 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id)) 2668 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0) 2669 + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0) 2670 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate) 2671 + userpolicy_type_attrsize(); 2672 } 2673 2674 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m, 2675 int num_migrate, const struct xfrm_kmaddress *k, 2676 const struct xfrm_selector *sel, 2677 const struct xfrm_encap_tmpl *encap, u8 dir, u8 type) 2678 { 2679 const struct xfrm_migrate *mp; 2680 struct xfrm_userpolicy_id *pol_id; 2681 struct nlmsghdr *nlh; 2682 int i, err; 2683 2684 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0); 2685 if (nlh == NULL) 2686 return -EMSGSIZE; 2687 2688 pol_id = nlmsg_data(nlh); 2689 /* copy data from selector, dir, and type to the pol_id */ 2690 memset(pol_id, 0, sizeof(*pol_id)); 2691 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel)); 2692 pol_id->dir = dir; 2693 2694 if (k != NULL) { 2695 err = copy_to_user_kmaddress(k, skb); 2696 if (err) 2697 goto out_cancel; 2698 } 2699 if (encap) { 2700 err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap); 2701 if (err) 2702 goto out_cancel; 2703 } 2704 err = copy_to_user_policy_type(type, skb); 2705 if (err) 2706 goto out_cancel; 2707 for (i = 0, mp = m ; i < num_migrate; i++, mp++) { 2708 err = copy_to_user_migrate(mp, skb); 2709 if (err) 2710 goto out_cancel; 2711 } 2712 2713 nlmsg_end(skb, nlh); 2714 return 0; 2715 2716 out_cancel: 2717 nlmsg_cancel(skb, nlh); 2718 return err; 2719 } 2720 2721 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2722 const struct xfrm_migrate *m, int num_migrate, 2723 const struct xfrm_kmaddress *k, 2724 const struct xfrm_encap_tmpl *encap) 2725 { 2726 struct net *net = &init_net; 2727 struct sk_buff *skb; 2728 int err; 2729 2730 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap), 2731 GFP_ATOMIC); 2732 if (skb == NULL) 2733 return -ENOMEM; 2734 2735 /* build migrate */ 2736 err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type); 2737 BUG_ON(err < 0); 2738 2739 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE); 2740 } 2741 #else 2742 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2743 const struct xfrm_migrate *m, int num_migrate, 2744 const struct xfrm_kmaddress *k, 2745 const struct xfrm_encap_tmpl *encap) 2746 { 2747 return -ENOPROTOOPT; 2748 } 2749 #endif 2750 2751 #define XMSGSIZE(type) sizeof(struct type) 2752 2753 const int xfrm_msg_min[XFRM_NR_MSGTYPES] = { 2754 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2755 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2756 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2757 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2758 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2759 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2760 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info), 2761 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire), 2762 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire), 2763 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2764 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2765 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire), 2766 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush), 2767 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0, 2768 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2769 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2770 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report), 2771 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2772 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32), 2773 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 2774 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 2775 [XFRM_MSG_SETDEFAULT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default), 2776 [XFRM_MSG_GETDEFAULT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default), 2777 }; 2778 EXPORT_SYMBOL_GPL(xfrm_msg_min); 2779 2780 #undef XMSGSIZE 2781 2782 const struct nla_policy xfrma_policy[XFRMA_MAX+1] = { 2783 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)}, 2784 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)}, 2785 [XFRMA_LASTUSED] = { .type = NLA_U64}, 2786 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)}, 2787 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) }, 2788 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) }, 2789 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) }, 2790 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) }, 2791 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) }, 2792 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) }, 2793 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) }, 2794 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) }, 2795 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) }, 2796 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 }, 2797 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 }, 2798 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) }, 2799 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) }, 2800 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)}, 2801 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) }, 2802 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) }, 2803 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) }, 2804 [XFRMA_TFCPAD] = { .type = NLA_U32 }, 2805 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) }, 2806 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 }, 2807 [XFRMA_PROTO] = { .type = NLA_U8 }, 2808 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) }, 2809 [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) }, 2810 [XFRMA_SET_MARK] = { .type = NLA_U32 }, 2811 [XFRMA_SET_MARK_MASK] = { .type = NLA_U32 }, 2812 [XFRMA_IF_ID] = { .type = NLA_U32 }, 2813 }; 2814 EXPORT_SYMBOL_GPL(xfrma_policy); 2815 2816 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = { 2817 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) }, 2818 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) }, 2819 }; 2820 2821 static const struct xfrm_link { 2822 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **); 2823 int (*start)(struct netlink_callback *); 2824 int (*dump)(struct sk_buff *, struct netlink_callback *); 2825 int (*done)(struct netlink_callback *); 2826 const struct nla_policy *nla_pol; 2827 int nla_max; 2828 } xfrm_dispatch[XFRM_NR_MSGTYPES] = { 2829 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 2830 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa }, 2831 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa, 2832 .dump = xfrm_dump_sa, 2833 .done = xfrm_dump_sa_done }, 2834 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 2835 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy }, 2836 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy, 2837 .start = xfrm_dump_policy_start, 2838 .dump = xfrm_dump_policy, 2839 .done = xfrm_dump_policy_done }, 2840 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi }, 2841 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire }, 2842 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire }, 2843 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 2844 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 2845 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire}, 2846 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa }, 2847 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy }, 2848 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae }, 2849 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae }, 2850 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate }, 2851 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo }, 2852 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo, 2853 .nla_pol = xfrma_spd_policy, 2854 .nla_max = XFRMA_SPD_MAX }, 2855 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo }, 2856 [XFRM_MSG_SETDEFAULT - XFRM_MSG_BASE] = { .doit = xfrm_set_default }, 2857 [XFRM_MSG_GETDEFAULT - XFRM_MSG_BASE] = { .doit = xfrm_get_default }, 2858 }; 2859 2860 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, 2861 struct netlink_ext_ack *extack) 2862 { 2863 struct net *net = sock_net(skb->sk); 2864 struct nlattr *attrs[XFRMA_MAX+1]; 2865 const struct xfrm_link *link; 2866 struct nlmsghdr *nlh64 = NULL; 2867 int type, err; 2868 2869 type = nlh->nlmsg_type; 2870 if (type > XFRM_MSG_MAX) 2871 return -EINVAL; 2872 2873 type -= XFRM_MSG_BASE; 2874 link = &xfrm_dispatch[type]; 2875 2876 /* All operations require privileges, even GET */ 2877 if (!netlink_net_capable(skb, CAP_NET_ADMIN)) 2878 return -EPERM; 2879 2880 if (in_compat_syscall()) { 2881 struct xfrm_translator *xtr = xfrm_get_translator(); 2882 2883 if (!xtr) 2884 return -EOPNOTSUPP; 2885 2886 nlh64 = xtr->rcv_msg_compat(nlh, link->nla_max, 2887 link->nla_pol, extack); 2888 xfrm_put_translator(xtr); 2889 if (IS_ERR(nlh64)) 2890 return PTR_ERR(nlh64); 2891 if (nlh64) 2892 nlh = nlh64; 2893 } 2894 2895 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) || 2896 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) && 2897 (nlh->nlmsg_flags & NLM_F_DUMP)) { 2898 struct netlink_dump_control c = { 2899 .start = link->start, 2900 .dump = link->dump, 2901 .done = link->done, 2902 }; 2903 2904 if (link->dump == NULL) { 2905 err = -EINVAL; 2906 goto err; 2907 } 2908 2909 err = netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c); 2910 goto err; 2911 } 2912 2913 err = nlmsg_parse_deprecated(nlh, xfrm_msg_min[type], attrs, 2914 link->nla_max ? : XFRMA_MAX, 2915 link->nla_pol ? : xfrma_policy, extack); 2916 if (err < 0) 2917 goto err; 2918 2919 if (link->doit == NULL) { 2920 err = -EINVAL; 2921 goto err; 2922 } 2923 2924 err = link->doit(skb, nlh, attrs); 2925 2926 /* We need to free skb allocated in xfrm_alloc_compat() before 2927 * returning from this function, because consume_skb() won't take 2928 * care of frag_list since netlink destructor sets 2929 * sbk->head to NULL. (see netlink_skb_destructor()) 2930 */ 2931 if (skb_has_frag_list(skb)) { 2932 kfree_skb(skb_shinfo(skb)->frag_list); 2933 skb_shinfo(skb)->frag_list = NULL; 2934 } 2935 2936 err: 2937 kvfree(nlh64); 2938 return err; 2939 } 2940 2941 static void xfrm_netlink_rcv(struct sk_buff *skb) 2942 { 2943 struct net *net = sock_net(skb->sk); 2944 2945 mutex_lock(&net->xfrm.xfrm_cfg_mutex); 2946 netlink_rcv_skb(skb, &xfrm_user_rcv_msg); 2947 mutex_unlock(&net->xfrm.xfrm_cfg_mutex); 2948 } 2949 2950 static inline unsigned int xfrm_expire_msgsize(void) 2951 { 2952 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire)) 2953 + nla_total_size(sizeof(struct xfrm_mark)); 2954 } 2955 2956 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 2957 { 2958 struct xfrm_user_expire *ue; 2959 struct nlmsghdr *nlh; 2960 int err; 2961 2962 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0); 2963 if (nlh == NULL) 2964 return -EMSGSIZE; 2965 2966 ue = nlmsg_data(nlh); 2967 copy_to_user_state(x, &ue->state); 2968 ue->hard = (c->data.hard != 0) ? 1 : 0; 2969 /* clear the padding bytes */ 2970 memset_after(ue, 0, hard); 2971 2972 err = xfrm_mark_put(skb, &x->mark); 2973 if (err) 2974 return err; 2975 2976 err = xfrm_if_id_put(skb, x->if_id); 2977 if (err) 2978 return err; 2979 2980 nlmsg_end(skb, nlh); 2981 return 0; 2982 } 2983 2984 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c) 2985 { 2986 struct net *net = xs_net(x); 2987 struct sk_buff *skb; 2988 2989 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC); 2990 if (skb == NULL) 2991 return -ENOMEM; 2992 2993 if (build_expire(skb, x, c) < 0) { 2994 kfree_skb(skb); 2995 return -EMSGSIZE; 2996 } 2997 2998 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE); 2999 } 3000 3001 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c) 3002 { 3003 struct net *net = xs_net(x); 3004 struct sk_buff *skb; 3005 int err; 3006 3007 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 3008 if (skb == NULL) 3009 return -ENOMEM; 3010 3011 err = build_aevent(skb, x, c); 3012 BUG_ON(err < 0); 3013 3014 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS); 3015 } 3016 3017 static int xfrm_notify_sa_flush(const struct km_event *c) 3018 { 3019 struct net *net = c->net; 3020 struct xfrm_usersa_flush *p; 3021 struct nlmsghdr *nlh; 3022 struct sk_buff *skb; 3023 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush)); 3024 3025 skb = nlmsg_new(len, GFP_ATOMIC); 3026 if (skb == NULL) 3027 return -ENOMEM; 3028 3029 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0); 3030 if (nlh == NULL) { 3031 kfree_skb(skb); 3032 return -EMSGSIZE; 3033 } 3034 3035 p = nlmsg_data(nlh); 3036 p->proto = c->data.proto; 3037 3038 nlmsg_end(skb, nlh); 3039 3040 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA); 3041 } 3042 3043 static inline unsigned int xfrm_sa_len(struct xfrm_state *x) 3044 { 3045 unsigned int l = 0; 3046 if (x->aead) 3047 l += nla_total_size(aead_len(x->aead)); 3048 if (x->aalg) { 3049 l += nla_total_size(sizeof(struct xfrm_algo) + 3050 (x->aalg->alg_key_len + 7) / 8); 3051 l += nla_total_size(xfrm_alg_auth_len(x->aalg)); 3052 } 3053 if (x->ealg) 3054 l += nla_total_size(xfrm_alg_len(x->ealg)); 3055 if (x->calg) 3056 l += nla_total_size(sizeof(*x->calg)); 3057 if (x->encap) 3058 l += nla_total_size(sizeof(*x->encap)); 3059 if (x->tfcpad) 3060 l += nla_total_size(sizeof(x->tfcpad)); 3061 if (x->replay_esn) 3062 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn)); 3063 else 3064 l += nla_total_size(sizeof(struct xfrm_replay_state)); 3065 if (x->security) 3066 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) + 3067 x->security->ctx_len); 3068 if (x->coaddr) 3069 l += nla_total_size(sizeof(*x->coaddr)); 3070 if (x->props.extra_flags) 3071 l += nla_total_size(sizeof(x->props.extra_flags)); 3072 if (x->xso.dev) 3073 l += nla_total_size(sizeof(struct xfrm_user_offload)); 3074 if (x->props.smark.v | x->props.smark.m) { 3075 l += nla_total_size(sizeof(x->props.smark.v)); 3076 l += nla_total_size(sizeof(x->props.smark.m)); 3077 } 3078 if (x->if_id) 3079 l += nla_total_size(sizeof(x->if_id)); 3080 3081 /* Must count x->lastused as it may become non-zero behind our back. */ 3082 l += nla_total_size_64bit(sizeof(u64)); 3083 3084 if (x->mapping_maxage) 3085 l += nla_total_size(sizeof(x->mapping_maxage)); 3086 3087 return l; 3088 } 3089 3090 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c) 3091 { 3092 struct net *net = xs_net(x); 3093 struct xfrm_usersa_info *p; 3094 struct xfrm_usersa_id *id; 3095 struct nlmsghdr *nlh; 3096 struct sk_buff *skb; 3097 unsigned int len = xfrm_sa_len(x); 3098 unsigned int headlen; 3099 int err; 3100 3101 headlen = sizeof(*p); 3102 if (c->event == XFRM_MSG_DELSA) { 3103 len += nla_total_size(headlen); 3104 headlen = sizeof(*id); 3105 len += nla_total_size(sizeof(struct xfrm_mark)); 3106 } 3107 len += NLMSG_ALIGN(headlen); 3108 3109 skb = nlmsg_new(len, GFP_ATOMIC); 3110 if (skb == NULL) 3111 return -ENOMEM; 3112 3113 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); 3114 err = -EMSGSIZE; 3115 if (nlh == NULL) 3116 goto out_free_skb; 3117 3118 p = nlmsg_data(nlh); 3119 if (c->event == XFRM_MSG_DELSA) { 3120 struct nlattr *attr; 3121 3122 id = nlmsg_data(nlh); 3123 memset(id, 0, sizeof(*id)); 3124 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr)); 3125 id->spi = x->id.spi; 3126 id->family = x->props.family; 3127 id->proto = x->id.proto; 3128 3129 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p)); 3130 err = -EMSGSIZE; 3131 if (attr == NULL) 3132 goto out_free_skb; 3133 3134 p = nla_data(attr); 3135 } 3136 err = copy_to_user_state_extra(x, p, skb); 3137 if (err) 3138 goto out_free_skb; 3139 3140 nlmsg_end(skb, nlh); 3141 3142 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA); 3143 3144 out_free_skb: 3145 kfree_skb(skb); 3146 return err; 3147 } 3148 3149 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c) 3150 { 3151 3152 switch (c->event) { 3153 case XFRM_MSG_EXPIRE: 3154 return xfrm_exp_state_notify(x, c); 3155 case XFRM_MSG_NEWAE: 3156 return xfrm_aevent_state_notify(x, c); 3157 case XFRM_MSG_DELSA: 3158 case XFRM_MSG_UPDSA: 3159 case XFRM_MSG_NEWSA: 3160 return xfrm_notify_sa(x, c); 3161 case XFRM_MSG_FLUSHSA: 3162 return xfrm_notify_sa_flush(c); 3163 default: 3164 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n", 3165 c->event); 3166 break; 3167 } 3168 3169 return 0; 3170 3171 } 3172 3173 static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x, 3174 struct xfrm_policy *xp) 3175 { 3176 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire)) 3177 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 3178 + nla_total_size(sizeof(struct xfrm_mark)) 3179 + nla_total_size(xfrm_user_sec_ctx_size(x->security)) 3180 + userpolicy_type_attrsize(); 3181 } 3182 3183 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x, 3184 struct xfrm_tmpl *xt, struct xfrm_policy *xp) 3185 { 3186 __u32 seq = xfrm_get_acqseq(); 3187 struct xfrm_user_acquire *ua; 3188 struct nlmsghdr *nlh; 3189 int err; 3190 3191 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0); 3192 if (nlh == NULL) 3193 return -EMSGSIZE; 3194 3195 ua = nlmsg_data(nlh); 3196 memcpy(&ua->id, &x->id, sizeof(ua->id)); 3197 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr)); 3198 memcpy(&ua->sel, &x->sel, sizeof(ua->sel)); 3199 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT); 3200 ua->aalgos = xt->aalgos; 3201 ua->ealgos = xt->ealgos; 3202 ua->calgos = xt->calgos; 3203 ua->seq = x->km.seq = seq; 3204 3205 err = copy_to_user_tmpl(xp, skb); 3206 if (!err) 3207 err = copy_to_user_state_sec_ctx(x, skb); 3208 if (!err) 3209 err = copy_to_user_policy_type(xp->type, skb); 3210 if (!err) 3211 err = xfrm_mark_put(skb, &xp->mark); 3212 if (!err) 3213 err = xfrm_if_id_put(skb, xp->if_id); 3214 if (err) { 3215 nlmsg_cancel(skb, nlh); 3216 return err; 3217 } 3218 3219 nlmsg_end(skb, nlh); 3220 return 0; 3221 } 3222 3223 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt, 3224 struct xfrm_policy *xp) 3225 { 3226 struct net *net = xs_net(x); 3227 struct sk_buff *skb; 3228 int err; 3229 3230 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC); 3231 if (skb == NULL) 3232 return -ENOMEM; 3233 3234 err = build_acquire(skb, x, xt, xp); 3235 BUG_ON(err < 0); 3236 3237 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE); 3238 } 3239 3240 /* User gives us xfrm_user_policy_info followed by an array of 0 3241 * or more templates. 3242 */ 3243 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt, 3244 u8 *data, int len, int *dir) 3245 { 3246 struct net *net = sock_net(sk); 3247 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data; 3248 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1); 3249 struct xfrm_policy *xp; 3250 int nr; 3251 3252 switch (sk->sk_family) { 3253 case AF_INET: 3254 if (opt != IP_XFRM_POLICY) { 3255 *dir = -EOPNOTSUPP; 3256 return NULL; 3257 } 3258 break; 3259 #if IS_ENABLED(CONFIG_IPV6) 3260 case AF_INET6: 3261 if (opt != IPV6_XFRM_POLICY) { 3262 *dir = -EOPNOTSUPP; 3263 return NULL; 3264 } 3265 break; 3266 #endif 3267 default: 3268 *dir = -EINVAL; 3269 return NULL; 3270 } 3271 3272 *dir = -EINVAL; 3273 3274 if (len < sizeof(*p) || 3275 verify_newpolicy_info(p)) 3276 return NULL; 3277 3278 nr = ((len - sizeof(*p)) / sizeof(*ut)); 3279 if (validate_tmpl(nr, ut, p->sel.family)) 3280 return NULL; 3281 3282 if (p->dir > XFRM_POLICY_OUT) 3283 return NULL; 3284 3285 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 3286 if (xp == NULL) { 3287 *dir = -ENOBUFS; 3288 return NULL; 3289 } 3290 3291 copy_from_user_policy(xp, p); 3292 xp->type = XFRM_POLICY_TYPE_MAIN; 3293 copy_templates(xp, ut, nr); 3294 3295 *dir = p->dir; 3296 3297 return xp; 3298 } 3299 3300 static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp) 3301 { 3302 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire)) 3303 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 3304 + nla_total_size(xfrm_user_sec_ctx_size(xp->security)) 3305 + nla_total_size(sizeof(struct xfrm_mark)) 3306 + userpolicy_type_attrsize(); 3307 } 3308 3309 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp, 3310 int dir, const struct km_event *c) 3311 { 3312 struct xfrm_user_polexpire *upe; 3313 int hard = c->data.hard; 3314 struct nlmsghdr *nlh; 3315 int err; 3316 3317 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0); 3318 if (nlh == NULL) 3319 return -EMSGSIZE; 3320 3321 upe = nlmsg_data(nlh); 3322 copy_to_user_policy(xp, &upe->pol, dir); 3323 err = copy_to_user_tmpl(xp, skb); 3324 if (!err) 3325 err = copy_to_user_sec_ctx(xp, skb); 3326 if (!err) 3327 err = copy_to_user_policy_type(xp->type, skb); 3328 if (!err) 3329 err = xfrm_mark_put(skb, &xp->mark); 3330 if (!err) 3331 err = xfrm_if_id_put(skb, xp->if_id); 3332 if (err) { 3333 nlmsg_cancel(skb, nlh); 3334 return err; 3335 } 3336 upe->hard = !!hard; 3337 3338 nlmsg_end(skb, nlh); 3339 return 0; 3340 } 3341 3342 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 3343 { 3344 struct net *net = xp_net(xp); 3345 struct sk_buff *skb; 3346 int err; 3347 3348 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC); 3349 if (skb == NULL) 3350 return -ENOMEM; 3351 3352 err = build_polexpire(skb, xp, dir, c); 3353 BUG_ON(err < 0); 3354 3355 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE); 3356 } 3357 3358 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) 3359 { 3360 unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); 3361 struct net *net = xp_net(xp); 3362 struct xfrm_userpolicy_info *p; 3363 struct xfrm_userpolicy_id *id; 3364 struct nlmsghdr *nlh; 3365 struct sk_buff *skb; 3366 unsigned int headlen; 3367 int err; 3368 3369 headlen = sizeof(*p); 3370 if (c->event == XFRM_MSG_DELPOLICY) { 3371 len += nla_total_size(headlen); 3372 headlen = sizeof(*id); 3373 } 3374 len += userpolicy_type_attrsize(); 3375 len += nla_total_size(sizeof(struct xfrm_mark)); 3376 len += NLMSG_ALIGN(headlen); 3377 3378 skb = nlmsg_new(len, GFP_ATOMIC); 3379 if (skb == NULL) 3380 return -ENOMEM; 3381 3382 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); 3383 err = -EMSGSIZE; 3384 if (nlh == NULL) 3385 goto out_free_skb; 3386 3387 p = nlmsg_data(nlh); 3388 if (c->event == XFRM_MSG_DELPOLICY) { 3389 struct nlattr *attr; 3390 3391 id = nlmsg_data(nlh); 3392 memset(id, 0, sizeof(*id)); 3393 id->dir = dir; 3394 if (c->data.byid) 3395 id->index = xp->index; 3396 else 3397 memcpy(&id->sel, &xp->selector, sizeof(id->sel)); 3398 3399 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p)); 3400 err = -EMSGSIZE; 3401 if (attr == NULL) 3402 goto out_free_skb; 3403 3404 p = nla_data(attr); 3405 } 3406 3407 copy_to_user_policy(xp, p, dir); 3408 err = copy_to_user_tmpl(xp, skb); 3409 if (!err) 3410 err = copy_to_user_policy_type(xp->type, skb); 3411 if (!err) 3412 err = xfrm_mark_put(skb, &xp->mark); 3413 if (!err) 3414 err = xfrm_if_id_put(skb, xp->if_id); 3415 if (err) 3416 goto out_free_skb; 3417 3418 nlmsg_end(skb, nlh); 3419 3420 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 3421 3422 out_free_skb: 3423 kfree_skb(skb); 3424 return err; 3425 } 3426 3427 static int xfrm_notify_policy_flush(const struct km_event *c) 3428 { 3429 struct net *net = c->net; 3430 struct nlmsghdr *nlh; 3431 struct sk_buff *skb; 3432 int err; 3433 3434 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC); 3435 if (skb == NULL) 3436 return -ENOMEM; 3437 3438 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0); 3439 err = -EMSGSIZE; 3440 if (nlh == NULL) 3441 goto out_free_skb; 3442 err = copy_to_user_policy_type(c->data.type, skb); 3443 if (err) 3444 goto out_free_skb; 3445 3446 nlmsg_end(skb, nlh); 3447 3448 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 3449 3450 out_free_skb: 3451 kfree_skb(skb); 3452 return err; 3453 } 3454 3455 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 3456 { 3457 3458 switch (c->event) { 3459 case XFRM_MSG_NEWPOLICY: 3460 case XFRM_MSG_UPDPOLICY: 3461 case XFRM_MSG_DELPOLICY: 3462 return xfrm_notify_policy(xp, dir, c); 3463 case XFRM_MSG_FLUSHPOLICY: 3464 return xfrm_notify_policy_flush(c); 3465 case XFRM_MSG_POLEXPIRE: 3466 return xfrm_exp_policy_notify(xp, dir, c); 3467 default: 3468 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n", 3469 c->event); 3470 } 3471 3472 return 0; 3473 3474 } 3475 3476 static inline unsigned int xfrm_report_msgsize(void) 3477 { 3478 return NLMSG_ALIGN(sizeof(struct xfrm_user_report)); 3479 } 3480 3481 static int build_report(struct sk_buff *skb, u8 proto, 3482 struct xfrm_selector *sel, xfrm_address_t *addr) 3483 { 3484 struct xfrm_user_report *ur; 3485 struct nlmsghdr *nlh; 3486 3487 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0); 3488 if (nlh == NULL) 3489 return -EMSGSIZE; 3490 3491 ur = nlmsg_data(nlh); 3492 ur->proto = proto; 3493 memcpy(&ur->sel, sel, sizeof(ur->sel)); 3494 3495 if (addr) { 3496 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr); 3497 if (err) { 3498 nlmsg_cancel(skb, nlh); 3499 return err; 3500 } 3501 } 3502 nlmsg_end(skb, nlh); 3503 return 0; 3504 } 3505 3506 static int xfrm_send_report(struct net *net, u8 proto, 3507 struct xfrm_selector *sel, xfrm_address_t *addr) 3508 { 3509 struct sk_buff *skb; 3510 int err; 3511 3512 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC); 3513 if (skb == NULL) 3514 return -ENOMEM; 3515 3516 err = build_report(skb, proto, sel, addr); 3517 BUG_ON(err < 0); 3518 3519 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT); 3520 } 3521 3522 static inline unsigned int xfrm_mapping_msgsize(void) 3523 { 3524 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping)); 3525 } 3526 3527 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x, 3528 xfrm_address_t *new_saddr, __be16 new_sport) 3529 { 3530 struct xfrm_user_mapping *um; 3531 struct nlmsghdr *nlh; 3532 3533 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0); 3534 if (nlh == NULL) 3535 return -EMSGSIZE; 3536 3537 um = nlmsg_data(nlh); 3538 3539 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr)); 3540 um->id.spi = x->id.spi; 3541 um->id.family = x->props.family; 3542 um->id.proto = x->id.proto; 3543 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr)); 3544 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr)); 3545 um->new_sport = new_sport; 3546 um->old_sport = x->encap->encap_sport; 3547 um->reqid = x->props.reqid; 3548 3549 nlmsg_end(skb, nlh); 3550 return 0; 3551 } 3552 3553 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, 3554 __be16 sport) 3555 { 3556 struct net *net = xs_net(x); 3557 struct sk_buff *skb; 3558 int err; 3559 3560 if (x->id.proto != IPPROTO_ESP) 3561 return -EINVAL; 3562 3563 if (!x->encap) 3564 return -EINVAL; 3565 3566 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC); 3567 if (skb == NULL) 3568 return -ENOMEM; 3569 3570 err = build_mapping(skb, x, ipaddr, sport); 3571 BUG_ON(err < 0); 3572 3573 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING); 3574 } 3575 3576 static bool xfrm_is_alive(const struct km_event *c) 3577 { 3578 return (bool)xfrm_acquire_is_on(c->net); 3579 } 3580 3581 static struct xfrm_mgr netlink_mgr = { 3582 .notify = xfrm_send_state_notify, 3583 .acquire = xfrm_send_acquire, 3584 .compile_policy = xfrm_compile_policy, 3585 .notify_policy = xfrm_send_policy_notify, 3586 .report = xfrm_send_report, 3587 .migrate = xfrm_send_migrate, 3588 .new_mapping = xfrm_send_mapping, 3589 .is_alive = xfrm_is_alive, 3590 }; 3591 3592 static int __net_init xfrm_user_net_init(struct net *net) 3593 { 3594 struct sock *nlsk; 3595 struct netlink_kernel_cfg cfg = { 3596 .groups = XFRMNLGRP_MAX, 3597 .input = xfrm_netlink_rcv, 3598 }; 3599 3600 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg); 3601 if (nlsk == NULL) 3602 return -ENOMEM; 3603 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */ 3604 rcu_assign_pointer(net->xfrm.nlsk, nlsk); 3605 return 0; 3606 } 3607 3608 static void __net_exit xfrm_user_net_pre_exit(struct net *net) 3609 { 3610 RCU_INIT_POINTER(net->xfrm.nlsk, NULL); 3611 } 3612 3613 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list) 3614 { 3615 struct net *net; 3616 3617 list_for_each_entry(net, net_exit_list, exit_list) 3618 netlink_kernel_release(net->xfrm.nlsk_stash); 3619 } 3620 3621 static struct pernet_operations xfrm_user_net_ops = { 3622 .init = xfrm_user_net_init, 3623 .pre_exit = xfrm_user_net_pre_exit, 3624 .exit_batch = xfrm_user_net_exit, 3625 }; 3626 3627 static int __init xfrm_user_init(void) 3628 { 3629 int rv; 3630 3631 printk(KERN_INFO "Initializing XFRM netlink socket\n"); 3632 3633 rv = register_pernet_subsys(&xfrm_user_net_ops); 3634 if (rv < 0) 3635 return rv; 3636 rv = xfrm_register_km(&netlink_mgr); 3637 if (rv < 0) 3638 unregister_pernet_subsys(&xfrm_user_net_ops); 3639 return rv; 3640 } 3641 3642 static void __exit xfrm_user_exit(void) 3643 { 3644 xfrm_unregister_km(&netlink_mgr); 3645 unregister_pernet_subsys(&xfrm_user_net_ops); 3646 } 3647 3648 module_init(xfrm_user_init); 3649 module_exit(xfrm_user_exit); 3650 MODULE_LICENSE("GPL"); 3651 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM); 3652