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