1 /* xfrm_user.c: User interface to configure xfrm engine. 2 * 3 * Copyright (C) 2002 David S. Miller (davem@redhat.com) 4 * 5 * Changes: 6 * Mitsuru KANDA @USAGI 7 * Kazunori MIYAZAWA @USAGI 8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com> 9 * IPv6 support 10 * 11 */ 12 13 #include <linux/crypto.h> 14 #include <linux/module.h> 15 #include <linux/kernel.h> 16 #include <linux/types.h> 17 #include <linux/slab.h> 18 #include <linux/socket.h> 19 #include <linux/string.h> 20 #include <linux/net.h> 21 #include <linux/skbuff.h> 22 #include <linux/pfkeyv2.h> 23 #include <linux/ipsec.h> 24 #include <linux/init.h> 25 #include <linux/security.h> 26 #include <net/sock.h> 27 #include <net/xfrm.h> 28 #include <net/netlink.h> 29 #include <net/ah.h> 30 #include <asm/uaccess.h> 31 #if IS_ENABLED(CONFIG_IPV6) 32 #include <linux/in6.h> 33 #endif 34 35 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type) 36 { 37 struct nlattr *rt = attrs[type]; 38 struct xfrm_algo *algp; 39 40 if (!rt) 41 return 0; 42 43 algp = nla_data(rt); 44 if (nla_len(rt) < xfrm_alg_len(algp)) 45 return -EINVAL; 46 47 switch (type) { 48 case XFRMA_ALG_AUTH: 49 case XFRMA_ALG_CRYPT: 50 case XFRMA_ALG_COMP: 51 break; 52 53 default: 54 return -EINVAL; 55 } 56 57 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; 58 return 0; 59 } 60 61 static int verify_auth_trunc(struct nlattr **attrs) 62 { 63 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC]; 64 struct xfrm_algo_auth *algp; 65 66 if (!rt) 67 return 0; 68 69 algp = nla_data(rt); 70 if (nla_len(rt) < xfrm_alg_auth_len(algp)) 71 return -EINVAL; 72 73 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; 74 return 0; 75 } 76 77 static int verify_aead(struct nlattr **attrs) 78 { 79 struct nlattr *rt = attrs[XFRMA_ALG_AEAD]; 80 struct xfrm_algo_aead *algp; 81 82 if (!rt) 83 return 0; 84 85 algp = nla_data(rt); 86 if (nla_len(rt) < aead_len(algp)) 87 return -EINVAL; 88 89 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; 90 return 0; 91 } 92 93 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type, 94 xfrm_address_t **addrp) 95 { 96 struct nlattr *rt = attrs[type]; 97 98 if (rt && addrp) 99 *addrp = nla_data(rt); 100 } 101 102 static inline int verify_sec_ctx_len(struct nlattr **attrs) 103 { 104 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 105 struct xfrm_user_sec_ctx *uctx; 106 107 if (!rt) 108 return 0; 109 110 uctx = nla_data(rt); 111 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len)) 112 return -EINVAL; 113 114 return 0; 115 } 116 117 static inline int verify_replay(struct xfrm_usersa_info *p, 118 struct nlattr **attrs) 119 { 120 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL]; 121 struct xfrm_replay_state_esn *rs; 122 123 if (p->flags & XFRM_STATE_ESN) { 124 if (!rt) 125 return -EINVAL; 126 127 rs = nla_data(rt); 128 129 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8) 130 return -EINVAL; 131 132 if (nla_len(rt) < xfrm_replay_state_esn_len(rs) && 133 nla_len(rt) != sizeof(*rs)) 134 return -EINVAL; 135 } 136 137 if (!rt) 138 return 0; 139 140 /* As only ESP and AH support ESN feature. */ 141 if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH)) 142 return -EINVAL; 143 144 if (p->replay_window != 0) 145 return -EINVAL; 146 147 return 0; 148 } 149 150 static int verify_newsa_info(struct xfrm_usersa_info *p, 151 struct nlattr **attrs) 152 { 153 int err; 154 155 err = -EINVAL; 156 switch (p->family) { 157 case AF_INET: 158 break; 159 160 case AF_INET6: 161 #if IS_ENABLED(CONFIG_IPV6) 162 break; 163 #else 164 err = -EAFNOSUPPORT; 165 goto out; 166 #endif 167 168 default: 169 goto out; 170 } 171 172 err = -EINVAL; 173 switch (p->id.proto) { 174 case IPPROTO_AH: 175 if ((!attrs[XFRMA_ALG_AUTH] && 176 !attrs[XFRMA_ALG_AUTH_TRUNC]) || 177 attrs[XFRMA_ALG_AEAD] || 178 attrs[XFRMA_ALG_CRYPT] || 179 attrs[XFRMA_ALG_COMP] || 180 attrs[XFRMA_TFCPAD]) 181 goto out; 182 break; 183 184 case IPPROTO_ESP: 185 if (attrs[XFRMA_ALG_COMP]) 186 goto out; 187 if (!attrs[XFRMA_ALG_AUTH] && 188 !attrs[XFRMA_ALG_AUTH_TRUNC] && 189 !attrs[XFRMA_ALG_CRYPT] && 190 !attrs[XFRMA_ALG_AEAD]) 191 goto out; 192 if ((attrs[XFRMA_ALG_AUTH] || 193 attrs[XFRMA_ALG_AUTH_TRUNC] || 194 attrs[XFRMA_ALG_CRYPT]) && 195 attrs[XFRMA_ALG_AEAD]) 196 goto out; 197 if (attrs[XFRMA_TFCPAD] && 198 p->mode != XFRM_MODE_TUNNEL) 199 goto out; 200 break; 201 202 case IPPROTO_COMP: 203 if (!attrs[XFRMA_ALG_COMP] || 204 attrs[XFRMA_ALG_AEAD] || 205 attrs[XFRMA_ALG_AUTH] || 206 attrs[XFRMA_ALG_AUTH_TRUNC] || 207 attrs[XFRMA_ALG_CRYPT] || 208 attrs[XFRMA_TFCPAD] || 209 (ntohl(p->id.spi) >= 0x10000)) 210 goto out; 211 break; 212 213 #if IS_ENABLED(CONFIG_IPV6) 214 case IPPROTO_DSTOPTS: 215 case IPPROTO_ROUTING: 216 if (attrs[XFRMA_ALG_COMP] || 217 attrs[XFRMA_ALG_AUTH] || 218 attrs[XFRMA_ALG_AUTH_TRUNC] || 219 attrs[XFRMA_ALG_AEAD] || 220 attrs[XFRMA_ALG_CRYPT] || 221 attrs[XFRMA_ENCAP] || 222 attrs[XFRMA_SEC_CTX] || 223 attrs[XFRMA_TFCPAD] || 224 !attrs[XFRMA_COADDR]) 225 goto out; 226 break; 227 #endif 228 229 default: 230 goto out; 231 } 232 233 if ((err = verify_aead(attrs))) 234 goto out; 235 if ((err = verify_auth_trunc(attrs))) 236 goto out; 237 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH))) 238 goto out; 239 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT))) 240 goto out; 241 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP))) 242 goto out; 243 if ((err = verify_sec_ctx_len(attrs))) 244 goto out; 245 if ((err = verify_replay(p, attrs))) 246 goto out; 247 248 err = -EINVAL; 249 switch (p->mode) { 250 case XFRM_MODE_TRANSPORT: 251 case XFRM_MODE_TUNNEL: 252 case XFRM_MODE_ROUTEOPTIMIZATION: 253 case XFRM_MODE_BEET: 254 break; 255 256 default: 257 goto out; 258 } 259 260 err = 0; 261 262 out: 263 return err; 264 } 265 266 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props, 267 struct xfrm_algo_desc *(*get_byname)(const char *, int), 268 struct nlattr *rta) 269 { 270 struct xfrm_algo *p, *ualg; 271 struct xfrm_algo_desc *algo; 272 273 if (!rta) 274 return 0; 275 276 ualg = nla_data(rta); 277 278 algo = get_byname(ualg->alg_name, 1); 279 if (!algo) 280 return -ENOSYS; 281 *props = algo->desc.sadb_alg_id; 282 283 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL); 284 if (!p) 285 return -ENOMEM; 286 287 strcpy(p->alg_name, algo->name); 288 *algpp = p; 289 return 0; 290 } 291 292 static int attach_crypt(struct xfrm_state *x, struct nlattr *rta) 293 { 294 struct xfrm_algo *p, *ualg; 295 struct xfrm_algo_desc *algo; 296 297 if (!rta) 298 return 0; 299 300 ualg = nla_data(rta); 301 302 algo = xfrm_ealg_get_byname(ualg->alg_name, 1); 303 if (!algo) 304 return -ENOSYS; 305 x->props.ealgo = algo->desc.sadb_alg_id; 306 307 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL); 308 if (!p) 309 return -ENOMEM; 310 311 strcpy(p->alg_name, algo->name); 312 x->ealg = p; 313 x->geniv = algo->uinfo.encr.geniv; 314 return 0; 315 } 316 317 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props, 318 struct nlattr *rta) 319 { 320 struct xfrm_algo *ualg; 321 struct xfrm_algo_auth *p; 322 struct xfrm_algo_desc *algo; 323 324 if (!rta) 325 return 0; 326 327 ualg = nla_data(rta); 328 329 algo = xfrm_aalg_get_byname(ualg->alg_name, 1); 330 if (!algo) 331 return -ENOSYS; 332 *props = algo->desc.sadb_alg_id; 333 334 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL); 335 if (!p) 336 return -ENOMEM; 337 338 strcpy(p->alg_name, algo->name); 339 p->alg_key_len = ualg->alg_key_len; 340 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; 341 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8); 342 343 *algpp = p; 344 return 0; 345 } 346 347 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props, 348 struct nlattr *rta) 349 { 350 struct xfrm_algo_auth *p, *ualg; 351 struct xfrm_algo_desc *algo; 352 353 if (!rta) 354 return 0; 355 356 ualg = nla_data(rta); 357 358 algo = xfrm_aalg_get_byname(ualg->alg_name, 1); 359 if (!algo) 360 return -ENOSYS; 361 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits) 362 return -EINVAL; 363 *props = algo->desc.sadb_alg_id; 364 365 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL); 366 if (!p) 367 return -ENOMEM; 368 369 strcpy(p->alg_name, algo->name); 370 if (!p->alg_trunc_len) 371 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; 372 373 *algpp = p; 374 return 0; 375 } 376 377 static int attach_aead(struct xfrm_state *x, struct nlattr *rta) 378 { 379 struct xfrm_algo_aead *p, *ualg; 380 struct xfrm_algo_desc *algo; 381 382 if (!rta) 383 return 0; 384 385 ualg = nla_data(rta); 386 387 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1); 388 if (!algo) 389 return -ENOSYS; 390 x->props.ealgo = algo->desc.sadb_alg_id; 391 392 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL); 393 if (!p) 394 return -ENOMEM; 395 396 strcpy(p->alg_name, algo->name); 397 x->aead = p; 398 x->geniv = algo->uinfo.aead.geniv; 399 return 0; 400 } 401 402 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn, 403 struct nlattr *rp) 404 { 405 struct xfrm_replay_state_esn *up; 406 int ulen; 407 408 if (!replay_esn || !rp) 409 return 0; 410 411 up = nla_data(rp); 412 ulen = xfrm_replay_state_esn_len(up); 413 414 if (nla_len(rp) < ulen || xfrm_replay_state_esn_len(replay_esn) != ulen) 415 return -EINVAL; 416 417 return 0; 418 } 419 420 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn, 421 struct xfrm_replay_state_esn **preplay_esn, 422 struct nlattr *rta) 423 { 424 struct xfrm_replay_state_esn *p, *pp, *up; 425 int klen, ulen; 426 427 if (!rta) 428 return 0; 429 430 up = nla_data(rta); 431 klen = xfrm_replay_state_esn_len(up); 432 ulen = nla_len(rta) >= klen ? klen : sizeof(*up); 433 434 p = kzalloc(klen, GFP_KERNEL); 435 if (!p) 436 return -ENOMEM; 437 438 pp = kzalloc(klen, GFP_KERNEL); 439 if (!pp) { 440 kfree(p); 441 return -ENOMEM; 442 } 443 444 memcpy(p, up, ulen); 445 memcpy(pp, up, ulen); 446 447 *replay_esn = p; 448 *preplay_esn = pp; 449 450 return 0; 451 } 452 453 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx) 454 { 455 int len = 0; 456 457 if (xfrm_ctx) { 458 len += sizeof(struct xfrm_user_sec_ctx); 459 len += xfrm_ctx->ctx_len; 460 } 461 return len; 462 } 463 464 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 465 { 466 memcpy(&x->id, &p->id, sizeof(x->id)); 467 memcpy(&x->sel, &p->sel, sizeof(x->sel)); 468 memcpy(&x->lft, &p->lft, sizeof(x->lft)); 469 x->props.mode = p->mode; 470 x->props.replay_window = min_t(unsigned int, p->replay_window, 471 sizeof(x->replay.bitmap) * 8); 472 x->props.reqid = p->reqid; 473 x->props.family = p->family; 474 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr)); 475 x->props.flags = p->flags; 476 477 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC)) 478 x->sel.family = p->family; 479 } 480 481 /* 482 * someday when pfkey also has support, we could have the code 483 * somehow made shareable and move it to xfrm_state.c - JHS 484 * 485 */ 486 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs, 487 int update_esn) 488 { 489 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 490 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL; 491 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 492 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; 493 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; 494 495 if (re) { 496 struct xfrm_replay_state_esn *replay_esn; 497 replay_esn = nla_data(re); 498 memcpy(x->replay_esn, replay_esn, 499 xfrm_replay_state_esn_len(replay_esn)); 500 memcpy(x->preplay_esn, replay_esn, 501 xfrm_replay_state_esn_len(replay_esn)); 502 } 503 504 if (rp) { 505 struct xfrm_replay_state *replay; 506 replay = nla_data(rp); 507 memcpy(&x->replay, replay, sizeof(*replay)); 508 memcpy(&x->preplay, replay, sizeof(*replay)); 509 } 510 511 if (lt) { 512 struct xfrm_lifetime_cur *ltime; 513 ltime = nla_data(lt); 514 x->curlft.bytes = ltime->bytes; 515 x->curlft.packets = ltime->packets; 516 x->curlft.add_time = ltime->add_time; 517 x->curlft.use_time = ltime->use_time; 518 } 519 520 if (et) 521 x->replay_maxage = nla_get_u32(et); 522 523 if (rt) 524 x->replay_maxdiff = nla_get_u32(rt); 525 } 526 527 static struct xfrm_state *xfrm_state_construct(struct net *net, 528 struct xfrm_usersa_info *p, 529 struct nlattr **attrs, 530 int *errp) 531 { 532 struct xfrm_state *x = xfrm_state_alloc(net); 533 int err = -ENOMEM; 534 535 if (!x) 536 goto error_no_put; 537 538 copy_from_user_state(x, p); 539 540 if (attrs[XFRMA_SA_EXTRA_FLAGS]) 541 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]); 542 543 if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD]))) 544 goto error; 545 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo, 546 attrs[XFRMA_ALG_AUTH_TRUNC]))) 547 goto error; 548 if (!x->props.aalgo) { 549 if ((err = attach_auth(&x->aalg, &x->props.aalgo, 550 attrs[XFRMA_ALG_AUTH]))) 551 goto error; 552 } 553 if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT]))) 554 goto error; 555 if ((err = attach_one_algo(&x->calg, &x->props.calgo, 556 xfrm_calg_get_byname, 557 attrs[XFRMA_ALG_COMP]))) 558 goto error; 559 560 if (attrs[XFRMA_ENCAP]) { 561 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]), 562 sizeof(*x->encap), GFP_KERNEL); 563 if (x->encap == NULL) 564 goto error; 565 } 566 567 if (attrs[XFRMA_TFCPAD]) 568 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]); 569 570 if (attrs[XFRMA_COADDR]) { 571 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]), 572 sizeof(*x->coaddr), GFP_KERNEL); 573 if (x->coaddr == NULL) 574 goto error; 575 } 576 577 xfrm_mark_get(attrs, &x->mark); 578 579 err = __xfrm_init_state(x, false); 580 if (err) 581 goto error; 582 583 if (attrs[XFRMA_SEC_CTX] && 584 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX]))) 585 goto error; 586 587 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn, 588 attrs[XFRMA_REPLAY_ESN_VAL]))) 589 goto error; 590 591 x->km.seq = p->seq; 592 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth; 593 /* sysctl_xfrm_aevent_etime is in 100ms units */ 594 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M; 595 596 if ((err = xfrm_init_replay(x))) 597 goto error; 598 599 /* override default values from above */ 600 xfrm_update_ae_params(x, attrs, 0); 601 602 return x; 603 604 error: 605 x->km.state = XFRM_STATE_DEAD; 606 xfrm_state_put(x); 607 error_no_put: 608 *errp = err; 609 return NULL; 610 } 611 612 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 613 struct nlattr **attrs) 614 { 615 struct net *net = sock_net(skb->sk); 616 struct xfrm_usersa_info *p = nlmsg_data(nlh); 617 struct xfrm_state *x; 618 int err; 619 struct km_event c; 620 621 err = verify_newsa_info(p, attrs); 622 if (err) 623 return err; 624 625 x = xfrm_state_construct(net, p, attrs, &err); 626 if (!x) 627 return err; 628 629 xfrm_state_hold(x); 630 if (nlh->nlmsg_type == XFRM_MSG_NEWSA) 631 err = xfrm_state_add(x); 632 else 633 err = xfrm_state_update(x); 634 635 xfrm_audit_state_add(x, err ? 0 : 1, true); 636 637 if (err < 0) { 638 x->km.state = XFRM_STATE_DEAD; 639 __xfrm_state_put(x); 640 goto out; 641 } 642 643 c.seq = nlh->nlmsg_seq; 644 c.portid = nlh->nlmsg_pid; 645 c.event = nlh->nlmsg_type; 646 647 km_state_notify(x, &c); 648 out: 649 xfrm_state_put(x); 650 return err; 651 } 652 653 static struct xfrm_state *xfrm_user_state_lookup(struct net *net, 654 struct xfrm_usersa_id *p, 655 struct nlattr **attrs, 656 int *errp) 657 { 658 struct xfrm_state *x = NULL; 659 struct xfrm_mark m; 660 int err; 661 u32 mark = xfrm_mark_get(attrs, &m); 662 663 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) { 664 err = -ESRCH; 665 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family); 666 } else { 667 xfrm_address_t *saddr = NULL; 668 669 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr); 670 if (!saddr) { 671 err = -EINVAL; 672 goto out; 673 } 674 675 err = -ESRCH; 676 x = xfrm_state_lookup_byaddr(net, mark, 677 &p->daddr, saddr, 678 p->proto, p->family); 679 } 680 681 out: 682 if (!x && errp) 683 *errp = err; 684 return x; 685 } 686 687 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 688 struct nlattr **attrs) 689 { 690 struct net *net = sock_net(skb->sk); 691 struct xfrm_state *x; 692 int err = -ESRCH; 693 struct km_event c; 694 struct xfrm_usersa_id *p = nlmsg_data(nlh); 695 696 x = xfrm_user_state_lookup(net, p, attrs, &err); 697 if (x == NULL) 698 return err; 699 700 if ((err = security_xfrm_state_delete(x)) != 0) 701 goto out; 702 703 if (xfrm_state_kern(x)) { 704 err = -EPERM; 705 goto out; 706 } 707 708 err = xfrm_state_delete(x); 709 710 if (err < 0) 711 goto out; 712 713 c.seq = nlh->nlmsg_seq; 714 c.portid = nlh->nlmsg_pid; 715 c.event = nlh->nlmsg_type; 716 km_state_notify(x, &c); 717 718 out: 719 xfrm_audit_state_delete(x, err ? 0 : 1, true); 720 xfrm_state_put(x); 721 return err; 722 } 723 724 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 725 { 726 memset(p, 0, sizeof(*p)); 727 memcpy(&p->id, &x->id, sizeof(p->id)); 728 memcpy(&p->sel, &x->sel, sizeof(p->sel)); 729 memcpy(&p->lft, &x->lft, sizeof(p->lft)); 730 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft)); 731 memcpy(&p->stats, &x->stats, sizeof(p->stats)); 732 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr)); 733 p->mode = x->props.mode; 734 p->replay_window = x->props.replay_window; 735 p->reqid = x->props.reqid; 736 p->family = x->props.family; 737 p->flags = x->props.flags; 738 p->seq = x->km.seq; 739 } 740 741 struct xfrm_dump_info { 742 struct sk_buff *in_skb; 743 struct sk_buff *out_skb; 744 u32 nlmsg_seq; 745 u16 nlmsg_flags; 746 }; 747 748 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb) 749 { 750 struct xfrm_user_sec_ctx *uctx; 751 struct nlattr *attr; 752 int ctx_size = sizeof(*uctx) + s->ctx_len; 753 754 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size); 755 if (attr == NULL) 756 return -EMSGSIZE; 757 758 uctx = nla_data(attr); 759 uctx->exttype = XFRMA_SEC_CTX; 760 uctx->len = ctx_size; 761 uctx->ctx_doi = s->ctx_doi; 762 uctx->ctx_alg = s->ctx_alg; 763 uctx->ctx_len = s->ctx_len; 764 memcpy(uctx + 1, s->ctx_str, s->ctx_len); 765 766 return 0; 767 } 768 769 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb) 770 { 771 struct xfrm_algo *algo; 772 struct nlattr *nla; 773 774 nla = nla_reserve(skb, XFRMA_ALG_AUTH, 775 sizeof(*algo) + (auth->alg_key_len + 7) / 8); 776 if (!nla) 777 return -EMSGSIZE; 778 779 algo = nla_data(nla); 780 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name)); 781 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8); 782 algo->alg_key_len = auth->alg_key_len; 783 784 return 0; 785 } 786 787 /* Don't change this without updating xfrm_sa_len! */ 788 static int copy_to_user_state_extra(struct xfrm_state *x, 789 struct xfrm_usersa_info *p, 790 struct sk_buff *skb) 791 { 792 int ret = 0; 793 794 copy_to_user_state(x, p); 795 796 if (x->props.extra_flags) { 797 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS, 798 x->props.extra_flags); 799 if (ret) 800 goto out; 801 } 802 803 if (x->coaddr) { 804 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr); 805 if (ret) 806 goto out; 807 } 808 if (x->lastused) { 809 ret = nla_put_u64(skb, XFRMA_LASTUSED, x->lastused); 810 if (ret) 811 goto out; 812 } 813 if (x->aead) { 814 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead); 815 if (ret) 816 goto out; 817 } 818 if (x->aalg) { 819 ret = copy_to_user_auth(x->aalg, skb); 820 if (!ret) 821 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC, 822 xfrm_alg_auth_len(x->aalg), x->aalg); 823 if (ret) 824 goto out; 825 } 826 if (x->ealg) { 827 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg); 828 if (ret) 829 goto out; 830 } 831 if (x->calg) { 832 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg); 833 if (ret) 834 goto out; 835 } 836 if (x->encap) { 837 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap); 838 if (ret) 839 goto out; 840 } 841 if (x->tfcpad) { 842 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad); 843 if (ret) 844 goto out; 845 } 846 ret = xfrm_mark_put(skb, &x->mark); 847 if (ret) 848 goto out; 849 if (x->replay_esn) 850 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL, 851 xfrm_replay_state_esn_len(x->replay_esn), 852 x->replay_esn); 853 else 854 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), 855 &x->replay); 856 if (ret) 857 goto out; 858 if (x->security) 859 ret = copy_sec_ctx(x->security, skb); 860 out: 861 return ret; 862 } 863 864 static int dump_one_state(struct xfrm_state *x, int count, void *ptr) 865 { 866 struct xfrm_dump_info *sp = ptr; 867 struct sk_buff *in_skb = sp->in_skb; 868 struct sk_buff *skb = sp->out_skb; 869 struct xfrm_usersa_info *p; 870 struct nlmsghdr *nlh; 871 int err; 872 873 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, 874 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags); 875 if (nlh == NULL) 876 return -EMSGSIZE; 877 878 p = nlmsg_data(nlh); 879 880 err = copy_to_user_state_extra(x, p, skb); 881 if (err) { 882 nlmsg_cancel(skb, nlh); 883 return err; 884 } 885 nlmsg_end(skb, nlh); 886 return 0; 887 } 888 889 static int xfrm_dump_sa_done(struct netlink_callback *cb) 890 { 891 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 892 struct sock *sk = cb->skb->sk; 893 struct net *net = sock_net(sk); 894 895 xfrm_state_walk_done(walk, net); 896 return 0; 897 } 898 899 static const struct nla_policy xfrma_policy[XFRMA_MAX+1]; 900 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb) 901 { 902 struct net *net = sock_net(skb->sk); 903 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 904 struct xfrm_dump_info info; 905 906 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) > 907 sizeof(cb->args) - sizeof(cb->args[0])); 908 909 info.in_skb = cb->skb; 910 info.out_skb = skb; 911 info.nlmsg_seq = cb->nlh->nlmsg_seq; 912 info.nlmsg_flags = NLM_F_MULTI; 913 914 if (!cb->args[0]) { 915 struct nlattr *attrs[XFRMA_MAX+1]; 916 struct xfrm_address_filter *filter = NULL; 917 u8 proto = 0; 918 int err; 919 920 cb->args[0] = 1; 921 922 err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX, 923 xfrma_policy); 924 if (err < 0) 925 return err; 926 927 if (attrs[XFRMA_ADDRESS_FILTER]) { 928 filter = kmalloc(sizeof(*filter), GFP_KERNEL); 929 if (filter == NULL) 930 return -ENOMEM; 931 932 memcpy(filter, nla_data(attrs[XFRMA_ADDRESS_FILTER]), 933 sizeof(*filter)); 934 } 935 936 if (attrs[XFRMA_PROTO]) 937 proto = nla_get_u8(attrs[XFRMA_PROTO]); 938 939 xfrm_state_walk_init(walk, proto, filter); 940 } 941 942 (void) xfrm_state_walk(net, walk, dump_one_state, &info); 943 944 return skb->len; 945 } 946 947 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb, 948 struct xfrm_state *x, u32 seq) 949 { 950 struct xfrm_dump_info info; 951 struct sk_buff *skb; 952 int err; 953 954 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 955 if (!skb) 956 return ERR_PTR(-ENOMEM); 957 958 info.in_skb = in_skb; 959 info.out_skb = skb; 960 info.nlmsg_seq = seq; 961 info.nlmsg_flags = 0; 962 963 err = dump_one_state(x, 0, &info); 964 if (err) { 965 kfree_skb(skb); 966 return ERR_PTR(err); 967 } 968 969 return skb; 970 } 971 972 /* A wrapper for nlmsg_multicast() checking that nlsk is still available. 973 * Must be called with RCU read lock. 974 */ 975 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb, 976 u32 pid, unsigned int group) 977 { 978 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk); 979 980 if (nlsk) 981 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC); 982 else 983 return -1; 984 } 985 986 static inline size_t xfrm_spdinfo_msgsize(void) 987 { 988 return NLMSG_ALIGN(4) 989 + nla_total_size(sizeof(struct xfrmu_spdinfo)) 990 + nla_total_size(sizeof(struct xfrmu_spdhinfo)) 991 + nla_total_size(sizeof(struct xfrmu_spdhthresh)) 992 + nla_total_size(sizeof(struct xfrmu_spdhthresh)); 993 } 994 995 static int build_spdinfo(struct sk_buff *skb, struct net *net, 996 u32 portid, u32 seq, u32 flags) 997 { 998 struct xfrmk_spdinfo si; 999 struct xfrmu_spdinfo spc; 1000 struct xfrmu_spdhinfo sph; 1001 struct xfrmu_spdhthresh spt4, spt6; 1002 struct nlmsghdr *nlh; 1003 int err; 1004 u32 *f; 1005 unsigned lseq; 1006 1007 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0); 1008 if (nlh == NULL) /* shouldn't really happen ... */ 1009 return -EMSGSIZE; 1010 1011 f = nlmsg_data(nlh); 1012 *f = flags; 1013 xfrm_spd_getinfo(net, &si); 1014 spc.incnt = si.incnt; 1015 spc.outcnt = si.outcnt; 1016 spc.fwdcnt = si.fwdcnt; 1017 spc.inscnt = si.inscnt; 1018 spc.outscnt = si.outscnt; 1019 spc.fwdscnt = si.fwdscnt; 1020 sph.spdhcnt = si.spdhcnt; 1021 sph.spdhmcnt = si.spdhmcnt; 1022 1023 do { 1024 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock); 1025 1026 spt4.lbits = net->xfrm.policy_hthresh.lbits4; 1027 spt4.rbits = net->xfrm.policy_hthresh.rbits4; 1028 spt6.lbits = net->xfrm.policy_hthresh.lbits6; 1029 spt6.rbits = net->xfrm.policy_hthresh.rbits6; 1030 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq)); 1031 1032 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc); 1033 if (!err) 1034 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph); 1035 if (!err) 1036 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4); 1037 if (!err) 1038 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6); 1039 if (err) { 1040 nlmsg_cancel(skb, nlh); 1041 return err; 1042 } 1043 1044 nlmsg_end(skb, nlh); 1045 return 0; 1046 } 1047 1048 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1049 struct nlattr **attrs) 1050 { 1051 struct net *net = sock_net(skb->sk); 1052 struct xfrmu_spdhthresh *thresh4 = NULL; 1053 struct xfrmu_spdhthresh *thresh6 = NULL; 1054 1055 /* selector prefixlen thresholds to hash policies */ 1056 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) { 1057 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH]; 1058 1059 if (nla_len(rta) < sizeof(*thresh4)) 1060 return -EINVAL; 1061 thresh4 = nla_data(rta); 1062 if (thresh4->lbits > 32 || thresh4->rbits > 32) 1063 return -EINVAL; 1064 } 1065 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) { 1066 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH]; 1067 1068 if (nla_len(rta) < sizeof(*thresh6)) 1069 return -EINVAL; 1070 thresh6 = nla_data(rta); 1071 if (thresh6->lbits > 128 || thresh6->rbits > 128) 1072 return -EINVAL; 1073 } 1074 1075 if (thresh4 || thresh6) { 1076 write_seqlock(&net->xfrm.policy_hthresh.lock); 1077 if (thresh4) { 1078 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits; 1079 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits; 1080 } 1081 if (thresh6) { 1082 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits; 1083 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits; 1084 } 1085 write_sequnlock(&net->xfrm.policy_hthresh.lock); 1086 1087 xfrm_policy_hash_rebuild(net); 1088 } 1089 1090 return 0; 1091 } 1092 1093 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1094 struct nlattr **attrs) 1095 { 1096 struct net *net = sock_net(skb->sk); 1097 struct sk_buff *r_skb; 1098 u32 *flags = nlmsg_data(nlh); 1099 u32 sportid = NETLINK_CB(skb).portid; 1100 u32 seq = nlh->nlmsg_seq; 1101 1102 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC); 1103 if (r_skb == NULL) 1104 return -ENOMEM; 1105 1106 if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0) 1107 BUG(); 1108 1109 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); 1110 } 1111 1112 static inline size_t xfrm_sadinfo_msgsize(void) 1113 { 1114 return NLMSG_ALIGN(4) 1115 + nla_total_size(sizeof(struct xfrmu_sadhinfo)) 1116 + nla_total_size(4); /* XFRMA_SAD_CNT */ 1117 } 1118 1119 static int build_sadinfo(struct sk_buff *skb, struct net *net, 1120 u32 portid, u32 seq, u32 flags) 1121 { 1122 struct xfrmk_sadinfo si; 1123 struct xfrmu_sadhinfo sh; 1124 struct nlmsghdr *nlh; 1125 int err; 1126 u32 *f; 1127 1128 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0); 1129 if (nlh == NULL) /* shouldn't really happen ... */ 1130 return -EMSGSIZE; 1131 1132 f = nlmsg_data(nlh); 1133 *f = flags; 1134 xfrm_sad_getinfo(net, &si); 1135 1136 sh.sadhmcnt = si.sadhmcnt; 1137 sh.sadhcnt = si.sadhcnt; 1138 1139 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt); 1140 if (!err) 1141 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh); 1142 if (err) { 1143 nlmsg_cancel(skb, nlh); 1144 return err; 1145 } 1146 1147 nlmsg_end(skb, nlh); 1148 return 0; 1149 } 1150 1151 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1152 struct nlattr **attrs) 1153 { 1154 struct net *net = sock_net(skb->sk); 1155 struct sk_buff *r_skb; 1156 u32 *flags = nlmsg_data(nlh); 1157 u32 sportid = NETLINK_CB(skb).portid; 1158 u32 seq = nlh->nlmsg_seq; 1159 1160 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC); 1161 if (r_skb == NULL) 1162 return -ENOMEM; 1163 1164 if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0) 1165 BUG(); 1166 1167 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); 1168 } 1169 1170 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 1171 struct nlattr **attrs) 1172 { 1173 struct net *net = sock_net(skb->sk); 1174 struct xfrm_usersa_id *p = nlmsg_data(nlh); 1175 struct xfrm_state *x; 1176 struct sk_buff *resp_skb; 1177 int err = -ESRCH; 1178 1179 x = xfrm_user_state_lookup(net, p, attrs, &err); 1180 if (x == NULL) 1181 goto out_noput; 1182 1183 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 1184 if (IS_ERR(resp_skb)) { 1185 err = PTR_ERR(resp_skb); 1186 } else { 1187 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); 1188 } 1189 xfrm_state_put(x); 1190 out_noput: 1191 return err; 1192 } 1193 1194 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, 1195 struct nlattr **attrs) 1196 { 1197 struct net *net = sock_net(skb->sk); 1198 struct xfrm_state *x; 1199 struct xfrm_userspi_info *p; 1200 struct sk_buff *resp_skb; 1201 xfrm_address_t *daddr; 1202 int family; 1203 int err; 1204 u32 mark; 1205 struct xfrm_mark m; 1206 1207 p = nlmsg_data(nlh); 1208 err = verify_spi_info(p->info.id.proto, p->min, p->max); 1209 if (err) 1210 goto out_noput; 1211 1212 family = p->info.family; 1213 daddr = &p->info.id.daddr; 1214 1215 x = NULL; 1216 1217 mark = xfrm_mark_get(attrs, &m); 1218 if (p->info.seq) { 1219 x = xfrm_find_acq_byseq(net, mark, p->info.seq); 1220 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) { 1221 xfrm_state_put(x); 1222 x = NULL; 1223 } 1224 } 1225 1226 if (!x) 1227 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid, 1228 p->info.id.proto, daddr, 1229 &p->info.saddr, 1, 1230 family); 1231 err = -ENOENT; 1232 if (x == NULL) 1233 goto out_noput; 1234 1235 err = xfrm_alloc_spi(x, p->min, p->max); 1236 if (err) 1237 goto out; 1238 1239 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 1240 if (IS_ERR(resp_skb)) { 1241 err = PTR_ERR(resp_skb); 1242 goto out; 1243 } 1244 1245 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); 1246 1247 out: 1248 xfrm_state_put(x); 1249 out_noput: 1250 return err; 1251 } 1252 1253 static int verify_policy_dir(u8 dir) 1254 { 1255 switch (dir) { 1256 case XFRM_POLICY_IN: 1257 case XFRM_POLICY_OUT: 1258 case XFRM_POLICY_FWD: 1259 break; 1260 1261 default: 1262 return -EINVAL; 1263 } 1264 1265 return 0; 1266 } 1267 1268 static int verify_policy_type(u8 type) 1269 { 1270 switch (type) { 1271 case XFRM_POLICY_TYPE_MAIN: 1272 #ifdef CONFIG_XFRM_SUB_POLICY 1273 case XFRM_POLICY_TYPE_SUB: 1274 #endif 1275 break; 1276 1277 default: 1278 return -EINVAL; 1279 } 1280 1281 return 0; 1282 } 1283 1284 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p) 1285 { 1286 int ret; 1287 1288 switch (p->share) { 1289 case XFRM_SHARE_ANY: 1290 case XFRM_SHARE_SESSION: 1291 case XFRM_SHARE_USER: 1292 case XFRM_SHARE_UNIQUE: 1293 break; 1294 1295 default: 1296 return -EINVAL; 1297 } 1298 1299 switch (p->action) { 1300 case XFRM_POLICY_ALLOW: 1301 case XFRM_POLICY_BLOCK: 1302 break; 1303 1304 default: 1305 return -EINVAL; 1306 } 1307 1308 switch (p->sel.family) { 1309 case AF_INET: 1310 break; 1311 1312 case AF_INET6: 1313 #if IS_ENABLED(CONFIG_IPV6) 1314 break; 1315 #else 1316 return -EAFNOSUPPORT; 1317 #endif 1318 1319 default: 1320 return -EINVAL; 1321 } 1322 1323 ret = verify_policy_dir(p->dir); 1324 if (ret) 1325 return ret; 1326 if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir)) 1327 return -EINVAL; 1328 1329 return 0; 1330 } 1331 1332 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs) 1333 { 1334 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1335 struct xfrm_user_sec_ctx *uctx; 1336 1337 if (!rt) 1338 return 0; 1339 1340 uctx = nla_data(rt); 1341 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL); 1342 } 1343 1344 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut, 1345 int nr) 1346 { 1347 int i; 1348 1349 xp->xfrm_nr = nr; 1350 for (i = 0; i < nr; i++, ut++) { 1351 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 1352 1353 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id)); 1354 memcpy(&t->saddr, &ut->saddr, 1355 sizeof(xfrm_address_t)); 1356 t->reqid = ut->reqid; 1357 t->mode = ut->mode; 1358 t->share = ut->share; 1359 t->optional = ut->optional; 1360 t->aalgos = ut->aalgos; 1361 t->ealgos = ut->ealgos; 1362 t->calgos = ut->calgos; 1363 /* If all masks are ~0, then we allow all algorithms. */ 1364 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos); 1365 t->encap_family = ut->family; 1366 } 1367 } 1368 1369 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family) 1370 { 1371 int i; 1372 1373 if (nr > XFRM_MAX_DEPTH) 1374 return -EINVAL; 1375 1376 for (i = 0; i < nr; i++) { 1377 /* We never validated the ut->family value, so many 1378 * applications simply leave it at zero. The check was 1379 * never made and ut->family was ignored because all 1380 * templates could be assumed to have the same family as 1381 * the policy itself. Now that we will have ipv4-in-ipv6 1382 * and ipv6-in-ipv4 tunnels, this is no longer true. 1383 */ 1384 if (!ut[i].family) 1385 ut[i].family = family; 1386 1387 switch (ut[i].family) { 1388 case AF_INET: 1389 break; 1390 #if IS_ENABLED(CONFIG_IPV6) 1391 case AF_INET6: 1392 break; 1393 #endif 1394 default: 1395 return -EINVAL; 1396 } 1397 } 1398 1399 return 0; 1400 } 1401 1402 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs) 1403 { 1404 struct nlattr *rt = attrs[XFRMA_TMPL]; 1405 1406 if (!rt) { 1407 pol->xfrm_nr = 0; 1408 } else { 1409 struct xfrm_user_tmpl *utmpl = nla_data(rt); 1410 int nr = nla_len(rt) / sizeof(*utmpl); 1411 int err; 1412 1413 err = validate_tmpl(nr, utmpl, pol->family); 1414 if (err) 1415 return err; 1416 1417 copy_templates(pol, utmpl, nr); 1418 } 1419 return 0; 1420 } 1421 1422 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs) 1423 { 1424 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE]; 1425 struct xfrm_userpolicy_type *upt; 1426 u8 type = XFRM_POLICY_TYPE_MAIN; 1427 int err; 1428 1429 if (rt) { 1430 upt = nla_data(rt); 1431 type = upt->type; 1432 } 1433 1434 err = verify_policy_type(type); 1435 if (err) 1436 return err; 1437 1438 *tp = type; 1439 return 0; 1440 } 1441 1442 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p) 1443 { 1444 xp->priority = p->priority; 1445 xp->index = p->index; 1446 memcpy(&xp->selector, &p->sel, sizeof(xp->selector)); 1447 memcpy(&xp->lft, &p->lft, sizeof(xp->lft)); 1448 xp->action = p->action; 1449 xp->flags = p->flags; 1450 xp->family = p->sel.family; 1451 /* XXX xp->share = p->share; */ 1452 } 1453 1454 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir) 1455 { 1456 memset(p, 0, sizeof(*p)); 1457 memcpy(&p->sel, &xp->selector, sizeof(p->sel)); 1458 memcpy(&p->lft, &xp->lft, sizeof(p->lft)); 1459 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft)); 1460 p->priority = xp->priority; 1461 p->index = xp->index; 1462 p->sel.family = xp->family; 1463 p->dir = dir; 1464 p->action = xp->action; 1465 p->flags = xp->flags; 1466 p->share = XFRM_SHARE_ANY; /* XXX xp->share */ 1467 } 1468 1469 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp) 1470 { 1471 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL); 1472 int err; 1473 1474 if (!xp) { 1475 *errp = -ENOMEM; 1476 return NULL; 1477 } 1478 1479 copy_from_user_policy(xp, p); 1480 1481 err = copy_from_user_policy_type(&xp->type, attrs); 1482 if (err) 1483 goto error; 1484 1485 if (!(err = copy_from_user_tmpl(xp, attrs))) 1486 err = copy_from_user_sec_ctx(xp, attrs); 1487 if (err) 1488 goto error; 1489 1490 xfrm_mark_get(attrs, &xp->mark); 1491 1492 return xp; 1493 error: 1494 *errp = err; 1495 xp->walk.dead = 1; 1496 xfrm_policy_destroy(xp); 1497 return NULL; 1498 } 1499 1500 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1501 struct nlattr **attrs) 1502 { 1503 struct net *net = sock_net(skb->sk); 1504 struct xfrm_userpolicy_info *p = nlmsg_data(nlh); 1505 struct xfrm_policy *xp; 1506 struct km_event c; 1507 int err; 1508 int excl; 1509 1510 err = verify_newpolicy_info(p); 1511 if (err) 1512 return err; 1513 err = verify_sec_ctx_len(attrs); 1514 if (err) 1515 return err; 1516 1517 xp = xfrm_policy_construct(net, p, attrs, &err); 1518 if (!xp) 1519 return err; 1520 1521 /* shouldn't excl be based on nlh flags?? 1522 * Aha! this is anti-netlink really i.e more pfkey derived 1523 * in netlink excl is a flag and you wouldnt need 1524 * a type XFRM_MSG_UPDPOLICY - JHS */ 1525 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY; 1526 err = xfrm_policy_insert(p->dir, xp, excl); 1527 xfrm_audit_policy_add(xp, err ? 0 : 1, true); 1528 1529 if (err) { 1530 security_xfrm_policy_free(xp->security); 1531 kfree(xp); 1532 return err; 1533 } 1534 1535 c.event = nlh->nlmsg_type; 1536 c.seq = nlh->nlmsg_seq; 1537 c.portid = nlh->nlmsg_pid; 1538 km_policy_notify(xp, p->dir, &c); 1539 1540 xfrm_pol_put(xp); 1541 1542 return 0; 1543 } 1544 1545 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb) 1546 { 1547 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH]; 1548 int i; 1549 1550 if (xp->xfrm_nr == 0) 1551 return 0; 1552 1553 for (i = 0; i < xp->xfrm_nr; i++) { 1554 struct xfrm_user_tmpl *up = &vec[i]; 1555 struct xfrm_tmpl *kp = &xp->xfrm_vec[i]; 1556 1557 memset(up, 0, sizeof(*up)); 1558 memcpy(&up->id, &kp->id, sizeof(up->id)); 1559 up->family = kp->encap_family; 1560 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr)); 1561 up->reqid = kp->reqid; 1562 up->mode = kp->mode; 1563 up->share = kp->share; 1564 up->optional = kp->optional; 1565 up->aalgos = kp->aalgos; 1566 up->ealgos = kp->ealgos; 1567 up->calgos = kp->calgos; 1568 } 1569 1570 return nla_put(skb, XFRMA_TMPL, 1571 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec); 1572 } 1573 1574 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb) 1575 { 1576 if (x->security) { 1577 return copy_sec_ctx(x->security, skb); 1578 } 1579 return 0; 1580 } 1581 1582 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb) 1583 { 1584 if (xp->security) 1585 return copy_sec_ctx(xp->security, skb); 1586 return 0; 1587 } 1588 static inline size_t userpolicy_type_attrsize(void) 1589 { 1590 #ifdef CONFIG_XFRM_SUB_POLICY 1591 return nla_total_size(sizeof(struct xfrm_userpolicy_type)); 1592 #else 1593 return 0; 1594 #endif 1595 } 1596 1597 #ifdef CONFIG_XFRM_SUB_POLICY 1598 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1599 { 1600 struct xfrm_userpolicy_type upt = { 1601 .type = type, 1602 }; 1603 1604 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt); 1605 } 1606 1607 #else 1608 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1609 { 1610 return 0; 1611 } 1612 #endif 1613 1614 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr) 1615 { 1616 struct xfrm_dump_info *sp = ptr; 1617 struct xfrm_userpolicy_info *p; 1618 struct sk_buff *in_skb = sp->in_skb; 1619 struct sk_buff *skb = sp->out_skb; 1620 struct nlmsghdr *nlh; 1621 int err; 1622 1623 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, 1624 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags); 1625 if (nlh == NULL) 1626 return -EMSGSIZE; 1627 1628 p = nlmsg_data(nlh); 1629 copy_to_user_policy(xp, p, dir); 1630 err = copy_to_user_tmpl(xp, skb); 1631 if (!err) 1632 err = copy_to_user_sec_ctx(xp, skb); 1633 if (!err) 1634 err = copy_to_user_policy_type(xp->type, skb); 1635 if (!err) 1636 err = xfrm_mark_put(skb, &xp->mark); 1637 if (err) { 1638 nlmsg_cancel(skb, nlh); 1639 return err; 1640 } 1641 nlmsg_end(skb, nlh); 1642 return 0; 1643 } 1644 1645 static int xfrm_dump_policy_done(struct netlink_callback *cb) 1646 { 1647 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1]; 1648 struct net *net = sock_net(cb->skb->sk); 1649 1650 xfrm_policy_walk_done(walk, net); 1651 return 0; 1652 } 1653 1654 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb) 1655 { 1656 struct net *net = sock_net(skb->sk); 1657 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1]; 1658 struct xfrm_dump_info info; 1659 1660 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) > 1661 sizeof(cb->args) - sizeof(cb->args[0])); 1662 1663 info.in_skb = cb->skb; 1664 info.out_skb = skb; 1665 info.nlmsg_seq = cb->nlh->nlmsg_seq; 1666 info.nlmsg_flags = NLM_F_MULTI; 1667 1668 if (!cb->args[0]) { 1669 cb->args[0] = 1; 1670 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY); 1671 } 1672 1673 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info); 1674 1675 return skb->len; 1676 } 1677 1678 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb, 1679 struct xfrm_policy *xp, 1680 int dir, u32 seq) 1681 { 1682 struct xfrm_dump_info info; 1683 struct sk_buff *skb; 1684 int err; 1685 1686 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1687 if (!skb) 1688 return ERR_PTR(-ENOMEM); 1689 1690 info.in_skb = in_skb; 1691 info.out_skb = skb; 1692 info.nlmsg_seq = seq; 1693 info.nlmsg_flags = 0; 1694 1695 err = dump_one_policy(xp, dir, 0, &info); 1696 if (err) { 1697 kfree_skb(skb); 1698 return ERR_PTR(err); 1699 } 1700 1701 return skb; 1702 } 1703 1704 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1705 struct nlattr **attrs) 1706 { 1707 struct net *net = sock_net(skb->sk); 1708 struct xfrm_policy *xp; 1709 struct xfrm_userpolicy_id *p; 1710 u8 type = XFRM_POLICY_TYPE_MAIN; 1711 int err; 1712 struct km_event c; 1713 int delete; 1714 struct xfrm_mark m; 1715 u32 mark = xfrm_mark_get(attrs, &m); 1716 1717 p = nlmsg_data(nlh); 1718 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY; 1719 1720 err = copy_from_user_policy_type(&type, attrs); 1721 if (err) 1722 return err; 1723 1724 err = verify_policy_dir(p->dir); 1725 if (err) 1726 return err; 1727 1728 if (p->index) 1729 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err); 1730 else { 1731 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1732 struct xfrm_sec_ctx *ctx; 1733 1734 err = verify_sec_ctx_len(attrs); 1735 if (err) 1736 return err; 1737 1738 ctx = NULL; 1739 if (rt) { 1740 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 1741 1742 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); 1743 if (err) 1744 return err; 1745 } 1746 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel, 1747 ctx, delete, &err); 1748 security_xfrm_policy_free(ctx); 1749 } 1750 if (xp == NULL) 1751 return -ENOENT; 1752 1753 if (!delete) { 1754 struct sk_buff *resp_skb; 1755 1756 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq); 1757 if (IS_ERR(resp_skb)) { 1758 err = PTR_ERR(resp_skb); 1759 } else { 1760 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, 1761 NETLINK_CB(skb).portid); 1762 } 1763 } else { 1764 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 1765 1766 if (err != 0) 1767 goto out; 1768 1769 c.data.byid = p->index; 1770 c.event = nlh->nlmsg_type; 1771 c.seq = nlh->nlmsg_seq; 1772 c.portid = nlh->nlmsg_pid; 1773 km_policy_notify(xp, p->dir, &c); 1774 } 1775 1776 out: 1777 xfrm_pol_put(xp); 1778 if (delete && err == 0) 1779 xfrm_garbage_collect(net); 1780 return err; 1781 } 1782 1783 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 1784 struct nlattr **attrs) 1785 { 1786 struct net *net = sock_net(skb->sk); 1787 struct km_event c; 1788 struct xfrm_usersa_flush *p = nlmsg_data(nlh); 1789 int err; 1790 1791 err = xfrm_state_flush(net, p->proto, true); 1792 if (err) { 1793 if (err == -ESRCH) /* empty table */ 1794 return 0; 1795 return err; 1796 } 1797 c.data.proto = p->proto; 1798 c.event = nlh->nlmsg_type; 1799 c.seq = nlh->nlmsg_seq; 1800 c.portid = nlh->nlmsg_pid; 1801 c.net = net; 1802 km_state_notify(NULL, &c); 1803 1804 return 0; 1805 } 1806 1807 static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x) 1808 { 1809 size_t replay_size = x->replay_esn ? 1810 xfrm_replay_state_esn_len(x->replay_esn) : 1811 sizeof(struct xfrm_replay_state); 1812 1813 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id)) 1814 + nla_total_size(replay_size) 1815 + nla_total_size(sizeof(struct xfrm_lifetime_cur)) 1816 + nla_total_size(sizeof(struct xfrm_mark)) 1817 + nla_total_size(4) /* XFRM_AE_RTHR */ 1818 + nla_total_size(4); /* XFRM_AE_ETHR */ 1819 } 1820 1821 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 1822 { 1823 struct xfrm_aevent_id *id; 1824 struct nlmsghdr *nlh; 1825 int err; 1826 1827 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0); 1828 if (nlh == NULL) 1829 return -EMSGSIZE; 1830 1831 id = nlmsg_data(nlh); 1832 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr)); 1833 id->sa_id.spi = x->id.spi; 1834 id->sa_id.family = x->props.family; 1835 id->sa_id.proto = x->id.proto; 1836 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr)); 1837 id->reqid = x->props.reqid; 1838 id->flags = c->data.aevent; 1839 1840 if (x->replay_esn) { 1841 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL, 1842 xfrm_replay_state_esn_len(x->replay_esn), 1843 x->replay_esn); 1844 } else { 1845 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), 1846 &x->replay); 1847 } 1848 if (err) 1849 goto out_cancel; 1850 err = nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft); 1851 if (err) 1852 goto out_cancel; 1853 1854 if (id->flags & XFRM_AE_RTHR) { 1855 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff); 1856 if (err) 1857 goto out_cancel; 1858 } 1859 if (id->flags & XFRM_AE_ETHR) { 1860 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH, 1861 x->replay_maxage * 10 / HZ); 1862 if (err) 1863 goto out_cancel; 1864 } 1865 err = xfrm_mark_put(skb, &x->mark); 1866 if (err) 1867 goto out_cancel; 1868 1869 nlmsg_end(skb, nlh); 1870 return 0; 1871 1872 out_cancel: 1873 nlmsg_cancel(skb, nlh); 1874 return err; 1875 } 1876 1877 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 1878 struct nlattr **attrs) 1879 { 1880 struct net *net = sock_net(skb->sk); 1881 struct xfrm_state *x; 1882 struct sk_buff *r_skb; 1883 int err; 1884 struct km_event c; 1885 u32 mark; 1886 struct xfrm_mark m; 1887 struct xfrm_aevent_id *p = nlmsg_data(nlh); 1888 struct xfrm_usersa_id *id = &p->sa_id; 1889 1890 mark = xfrm_mark_get(attrs, &m); 1891 1892 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family); 1893 if (x == NULL) 1894 return -ESRCH; 1895 1896 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 1897 if (r_skb == NULL) { 1898 xfrm_state_put(x); 1899 return -ENOMEM; 1900 } 1901 1902 /* 1903 * XXX: is this lock really needed - none of the other 1904 * gets lock (the concern is things getting updated 1905 * while we are still reading) - jhs 1906 */ 1907 spin_lock_bh(&x->lock); 1908 c.data.aevent = p->flags; 1909 c.seq = nlh->nlmsg_seq; 1910 c.portid = nlh->nlmsg_pid; 1911 1912 if (build_aevent(r_skb, x, &c) < 0) 1913 BUG(); 1914 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid); 1915 spin_unlock_bh(&x->lock); 1916 xfrm_state_put(x); 1917 return err; 1918 } 1919 1920 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 1921 struct nlattr **attrs) 1922 { 1923 struct net *net = sock_net(skb->sk); 1924 struct xfrm_state *x; 1925 struct km_event c; 1926 int err = -EINVAL; 1927 u32 mark = 0; 1928 struct xfrm_mark m; 1929 struct xfrm_aevent_id *p = nlmsg_data(nlh); 1930 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 1931 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL]; 1932 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 1933 1934 if (!lt && !rp && !re) 1935 return err; 1936 1937 /* pedantic mode - thou shalt sayeth replaceth */ 1938 if (!(nlh->nlmsg_flags&NLM_F_REPLACE)) 1939 return err; 1940 1941 mark = xfrm_mark_get(attrs, &m); 1942 1943 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family); 1944 if (x == NULL) 1945 return -ESRCH; 1946 1947 if (x->km.state != XFRM_STATE_VALID) 1948 goto out; 1949 1950 err = xfrm_replay_verify_len(x->replay_esn, re); 1951 if (err) 1952 goto out; 1953 1954 spin_lock_bh(&x->lock); 1955 xfrm_update_ae_params(x, attrs, 1); 1956 spin_unlock_bh(&x->lock); 1957 1958 c.event = nlh->nlmsg_type; 1959 c.seq = nlh->nlmsg_seq; 1960 c.portid = nlh->nlmsg_pid; 1961 c.data.aevent = XFRM_AE_CU; 1962 km_state_notify(x, &c); 1963 err = 0; 1964 out: 1965 xfrm_state_put(x); 1966 return err; 1967 } 1968 1969 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1970 struct nlattr **attrs) 1971 { 1972 struct net *net = sock_net(skb->sk); 1973 struct km_event c; 1974 u8 type = XFRM_POLICY_TYPE_MAIN; 1975 int err; 1976 1977 err = copy_from_user_policy_type(&type, attrs); 1978 if (err) 1979 return err; 1980 1981 err = xfrm_policy_flush(net, type, true); 1982 if (err) { 1983 if (err == -ESRCH) /* empty table */ 1984 return 0; 1985 return err; 1986 } 1987 1988 c.data.type = type; 1989 c.event = nlh->nlmsg_type; 1990 c.seq = nlh->nlmsg_seq; 1991 c.portid = nlh->nlmsg_pid; 1992 c.net = net; 1993 km_policy_notify(NULL, 0, &c); 1994 return 0; 1995 } 1996 1997 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 1998 struct nlattr **attrs) 1999 { 2000 struct net *net = sock_net(skb->sk); 2001 struct xfrm_policy *xp; 2002 struct xfrm_user_polexpire *up = nlmsg_data(nlh); 2003 struct xfrm_userpolicy_info *p = &up->pol; 2004 u8 type = XFRM_POLICY_TYPE_MAIN; 2005 int err = -ENOENT; 2006 struct xfrm_mark m; 2007 u32 mark = xfrm_mark_get(attrs, &m); 2008 2009 err = copy_from_user_policy_type(&type, attrs); 2010 if (err) 2011 return err; 2012 2013 err = verify_policy_dir(p->dir); 2014 if (err) 2015 return err; 2016 2017 if (p->index) 2018 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err); 2019 else { 2020 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 2021 struct xfrm_sec_ctx *ctx; 2022 2023 err = verify_sec_ctx_len(attrs); 2024 if (err) 2025 return err; 2026 2027 ctx = NULL; 2028 if (rt) { 2029 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 2030 2031 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); 2032 if (err) 2033 return err; 2034 } 2035 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, 2036 &p->sel, ctx, 0, &err); 2037 security_xfrm_policy_free(ctx); 2038 } 2039 if (xp == NULL) 2040 return -ENOENT; 2041 2042 if (unlikely(xp->walk.dead)) 2043 goto out; 2044 2045 err = 0; 2046 if (up->hard) { 2047 xfrm_policy_delete(xp, p->dir); 2048 xfrm_audit_policy_delete(xp, 1, true); 2049 } else { 2050 // reset the timers here? 2051 WARN(1, "Dont know what to do with soft policy expire\n"); 2052 } 2053 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid); 2054 2055 out: 2056 xfrm_pol_put(xp); 2057 return err; 2058 } 2059 2060 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 2061 struct nlattr **attrs) 2062 { 2063 struct net *net = sock_net(skb->sk); 2064 struct xfrm_state *x; 2065 int err; 2066 struct xfrm_user_expire *ue = nlmsg_data(nlh); 2067 struct xfrm_usersa_info *p = &ue->state; 2068 struct xfrm_mark m; 2069 u32 mark = xfrm_mark_get(attrs, &m); 2070 2071 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family); 2072 2073 err = -ENOENT; 2074 if (x == NULL) 2075 return err; 2076 2077 spin_lock_bh(&x->lock); 2078 err = -EINVAL; 2079 if (x->km.state != XFRM_STATE_VALID) 2080 goto out; 2081 km_state_expired(x, ue->hard, nlh->nlmsg_pid); 2082 2083 if (ue->hard) { 2084 __xfrm_state_delete(x); 2085 xfrm_audit_state_delete(x, 1, true); 2086 } 2087 err = 0; 2088 out: 2089 spin_unlock_bh(&x->lock); 2090 xfrm_state_put(x); 2091 return err; 2092 } 2093 2094 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, 2095 struct nlattr **attrs) 2096 { 2097 struct net *net = sock_net(skb->sk); 2098 struct xfrm_policy *xp; 2099 struct xfrm_user_tmpl *ut; 2100 int i; 2101 struct nlattr *rt = attrs[XFRMA_TMPL]; 2102 struct xfrm_mark mark; 2103 2104 struct xfrm_user_acquire *ua = nlmsg_data(nlh); 2105 struct xfrm_state *x = xfrm_state_alloc(net); 2106 int err = -ENOMEM; 2107 2108 if (!x) 2109 goto nomem; 2110 2111 xfrm_mark_get(attrs, &mark); 2112 2113 err = verify_newpolicy_info(&ua->policy); 2114 if (err) 2115 goto bad_policy; 2116 2117 /* build an XP */ 2118 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err); 2119 if (!xp) 2120 goto free_state; 2121 2122 memcpy(&x->id, &ua->id, sizeof(ua->id)); 2123 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr)); 2124 memcpy(&x->sel, &ua->sel, sizeof(ua->sel)); 2125 xp->mark.m = x->mark.m = mark.m; 2126 xp->mark.v = x->mark.v = mark.v; 2127 ut = nla_data(rt); 2128 /* extract the templates and for each call km_key */ 2129 for (i = 0; i < xp->xfrm_nr; i++, ut++) { 2130 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 2131 memcpy(&x->id, &t->id, sizeof(x->id)); 2132 x->props.mode = t->mode; 2133 x->props.reqid = t->reqid; 2134 x->props.family = ut->family; 2135 t->aalgos = ua->aalgos; 2136 t->ealgos = ua->ealgos; 2137 t->calgos = ua->calgos; 2138 err = km_query(x, t, xp); 2139 2140 } 2141 2142 kfree(x); 2143 kfree(xp); 2144 2145 return 0; 2146 2147 bad_policy: 2148 WARN(1, "BAD policy passed\n"); 2149 free_state: 2150 kfree(x); 2151 nomem: 2152 return err; 2153 } 2154 2155 #ifdef CONFIG_XFRM_MIGRATE 2156 static int copy_from_user_migrate(struct xfrm_migrate *ma, 2157 struct xfrm_kmaddress *k, 2158 struct nlattr **attrs, int *num) 2159 { 2160 struct nlattr *rt = attrs[XFRMA_MIGRATE]; 2161 struct xfrm_user_migrate *um; 2162 int i, num_migrate; 2163 2164 if (k != NULL) { 2165 struct xfrm_user_kmaddress *uk; 2166 2167 uk = nla_data(attrs[XFRMA_KMADDRESS]); 2168 memcpy(&k->local, &uk->local, sizeof(k->local)); 2169 memcpy(&k->remote, &uk->remote, sizeof(k->remote)); 2170 k->family = uk->family; 2171 k->reserved = uk->reserved; 2172 } 2173 2174 um = nla_data(rt); 2175 num_migrate = nla_len(rt) / sizeof(*um); 2176 2177 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH) 2178 return -EINVAL; 2179 2180 for (i = 0; i < num_migrate; i++, um++, ma++) { 2181 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr)); 2182 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr)); 2183 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr)); 2184 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr)); 2185 2186 ma->proto = um->proto; 2187 ma->mode = um->mode; 2188 ma->reqid = um->reqid; 2189 2190 ma->old_family = um->old_family; 2191 ma->new_family = um->new_family; 2192 } 2193 2194 *num = i; 2195 return 0; 2196 } 2197 2198 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 2199 struct nlattr **attrs) 2200 { 2201 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh); 2202 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 2203 struct xfrm_kmaddress km, *kmp; 2204 u8 type; 2205 int err; 2206 int n = 0; 2207 struct net *net = sock_net(skb->sk); 2208 2209 if (attrs[XFRMA_MIGRATE] == NULL) 2210 return -EINVAL; 2211 2212 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL; 2213 2214 err = copy_from_user_policy_type(&type, attrs); 2215 if (err) 2216 return err; 2217 2218 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n); 2219 if (err) 2220 return err; 2221 2222 if (!n) 2223 return 0; 2224 2225 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net); 2226 2227 return 0; 2228 } 2229 #else 2230 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 2231 struct nlattr **attrs) 2232 { 2233 return -ENOPROTOOPT; 2234 } 2235 #endif 2236 2237 #ifdef CONFIG_XFRM_MIGRATE 2238 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb) 2239 { 2240 struct xfrm_user_migrate um; 2241 2242 memset(&um, 0, sizeof(um)); 2243 um.proto = m->proto; 2244 um.mode = m->mode; 2245 um.reqid = m->reqid; 2246 um.old_family = m->old_family; 2247 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr)); 2248 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr)); 2249 um.new_family = m->new_family; 2250 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr)); 2251 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr)); 2252 2253 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um); 2254 } 2255 2256 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb) 2257 { 2258 struct xfrm_user_kmaddress uk; 2259 2260 memset(&uk, 0, sizeof(uk)); 2261 uk.family = k->family; 2262 uk.reserved = k->reserved; 2263 memcpy(&uk.local, &k->local, sizeof(uk.local)); 2264 memcpy(&uk.remote, &k->remote, sizeof(uk.remote)); 2265 2266 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk); 2267 } 2268 2269 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma) 2270 { 2271 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id)) 2272 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0) 2273 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate) 2274 + userpolicy_type_attrsize(); 2275 } 2276 2277 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m, 2278 int num_migrate, const struct xfrm_kmaddress *k, 2279 const struct xfrm_selector *sel, u8 dir, u8 type) 2280 { 2281 const struct xfrm_migrate *mp; 2282 struct xfrm_userpolicy_id *pol_id; 2283 struct nlmsghdr *nlh; 2284 int i, err; 2285 2286 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0); 2287 if (nlh == NULL) 2288 return -EMSGSIZE; 2289 2290 pol_id = nlmsg_data(nlh); 2291 /* copy data from selector, dir, and type to the pol_id */ 2292 memset(pol_id, 0, sizeof(*pol_id)); 2293 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel)); 2294 pol_id->dir = dir; 2295 2296 if (k != NULL) { 2297 err = copy_to_user_kmaddress(k, skb); 2298 if (err) 2299 goto out_cancel; 2300 } 2301 err = copy_to_user_policy_type(type, skb); 2302 if (err) 2303 goto out_cancel; 2304 for (i = 0, mp = m ; i < num_migrate; i++, mp++) { 2305 err = copy_to_user_migrate(mp, skb); 2306 if (err) 2307 goto out_cancel; 2308 } 2309 2310 nlmsg_end(skb, nlh); 2311 return 0; 2312 2313 out_cancel: 2314 nlmsg_cancel(skb, nlh); 2315 return err; 2316 } 2317 2318 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2319 const struct xfrm_migrate *m, int num_migrate, 2320 const struct xfrm_kmaddress *k) 2321 { 2322 struct net *net = &init_net; 2323 struct sk_buff *skb; 2324 2325 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC); 2326 if (skb == NULL) 2327 return -ENOMEM; 2328 2329 /* build migrate */ 2330 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0) 2331 BUG(); 2332 2333 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE); 2334 } 2335 #else 2336 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2337 const struct xfrm_migrate *m, int num_migrate, 2338 const struct xfrm_kmaddress *k) 2339 { 2340 return -ENOPROTOOPT; 2341 } 2342 #endif 2343 2344 #define XMSGSIZE(type) sizeof(struct type) 2345 2346 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = { 2347 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2348 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2349 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2350 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2351 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2352 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2353 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info), 2354 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire), 2355 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire), 2356 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2357 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2358 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire), 2359 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush), 2360 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0, 2361 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2362 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2363 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report), 2364 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2365 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32), 2366 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 2367 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 2368 }; 2369 2370 #undef XMSGSIZE 2371 2372 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = { 2373 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)}, 2374 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)}, 2375 [XFRMA_LASTUSED] = { .type = NLA_U64}, 2376 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)}, 2377 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) }, 2378 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) }, 2379 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) }, 2380 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) }, 2381 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) }, 2382 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) }, 2383 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) }, 2384 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) }, 2385 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) }, 2386 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 }, 2387 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 }, 2388 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) }, 2389 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) }, 2390 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)}, 2391 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) }, 2392 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) }, 2393 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) }, 2394 [XFRMA_TFCPAD] = { .type = NLA_U32 }, 2395 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) }, 2396 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 }, 2397 [XFRMA_PROTO] = { .type = NLA_U8 }, 2398 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) }, 2399 }; 2400 2401 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = { 2402 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) }, 2403 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) }, 2404 }; 2405 2406 static const struct xfrm_link { 2407 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **); 2408 int (*dump)(struct sk_buff *, struct netlink_callback *); 2409 int (*done)(struct netlink_callback *); 2410 const struct nla_policy *nla_pol; 2411 int nla_max; 2412 } xfrm_dispatch[XFRM_NR_MSGTYPES] = { 2413 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 2414 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa }, 2415 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa, 2416 .dump = xfrm_dump_sa, 2417 .done = xfrm_dump_sa_done }, 2418 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 2419 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy }, 2420 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy, 2421 .dump = xfrm_dump_policy, 2422 .done = xfrm_dump_policy_done }, 2423 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi }, 2424 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire }, 2425 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire }, 2426 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 2427 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 2428 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire}, 2429 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa }, 2430 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy }, 2431 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae }, 2432 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae }, 2433 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate }, 2434 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo }, 2435 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo, 2436 .nla_pol = xfrma_spd_policy, 2437 .nla_max = XFRMA_SPD_MAX }, 2438 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo }, 2439 }; 2440 2441 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 2442 { 2443 struct net *net = sock_net(skb->sk); 2444 struct nlattr *attrs[XFRMA_MAX+1]; 2445 const struct xfrm_link *link; 2446 int type, err; 2447 2448 #ifdef CONFIG_COMPAT 2449 if (is_compat_task()) 2450 return -ENOTSUPP; 2451 #endif 2452 2453 type = nlh->nlmsg_type; 2454 if (type > XFRM_MSG_MAX) 2455 return -EINVAL; 2456 2457 type -= XFRM_MSG_BASE; 2458 link = &xfrm_dispatch[type]; 2459 2460 /* All operations require privileges, even GET */ 2461 if (!netlink_net_capable(skb, CAP_NET_ADMIN)) 2462 return -EPERM; 2463 2464 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) || 2465 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) && 2466 (nlh->nlmsg_flags & NLM_F_DUMP)) { 2467 if (link->dump == NULL) 2468 return -EINVAL; 2469 2470 { 2471 struct netlink_dump_control c = { 2472 .dump = link->dump, 2473 .done = link->done, 2474 }; 2475 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c); 2476 } 2477 } 2478 2479 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, 2480 link->nla_max ? : XFRMA_MAX, 2481 link->nla_pol ? : xfrma_policy); 2482 if (err < 0) 2483 return err; 2484 2485 if (link->doit == NULL) 2486 return -EINVAL; 2487 2488 return link->doit(skb, nlh, attrs); 2489 } 2490 2491 static void xfrm_netlink_rcv(struct sk_buff *skb) 2492 { 2493 struct net *net = sock_net(skb->sk); 2494 2495 mutex_lock(&net->xfrm.xfrm_cfg_mutex); 2496 netlink_rcv_skb(skb, &xfrm_user_rcv_msg); 2497 mutex_unlock(&net->xfrm.xfrm_cfg_mutex); 2498 } 2499 2500 static inline size_t xfrm_expire_msgsize(void) 2501 { 2502 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire)) 2503 + nla_total_size(sizeof(struct xfrm_mark)); 2504 } 2505 2506 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 2507 { 2508 struct xfrm_user_expire *ue; 2509 struct nlmsghdr *nlh; 2510 int err; 2511 2512 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0); 2513 if (nlh == NULL) 2514 return -EMSGSIZE; 2515 2516 ue = nlmsg_data(nlh); 2517 copy_to_user_state(x, &ue->state); 2518 ue->hard = (c->data.hard != 0) ? 1 : 0; 2519 2520 err = xfrm_mark_put(skb, &x->mark); 2521 if (err) 2522 return err; 2523 2524 nlmsg_end(skb, nlh); 2525 return 0; 2526 } 2527 2528 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c) 2529 { 2530 struct net *net = xs_net(x); 2531 struct sk_buff *skb; 2532 2533 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC); 2534 if (skb == NULL) 2535 return -ENOMEM; 2536 2537 if (build_expire(skb, x, c) < 0) { 2538 kfree_skb(skb); 2539 return -EMSGSIZE; 2540 } 2541 2542 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE); 2543 } 2544 2545 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c) 2546 { 2547 struct net *net = xs_net(x); 2548 struct sk_buff *skb; 2549 2550 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 2551 if (skb == NULL) 2552 return -ENOMEM; 2553 2554 if (build_aevent(skb, x, c) < 0) 2555 BUG(); 2556 2557 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS); 2558 } 2559 2560 static int xfrm_notify_sa_flush(const struct km_event *c) 2561 { 2562 struct net *net = c->net; 2563 struct xfrm_usersa_flush *p; 2564 struct nlmsghdr *nlh; 2565 struct sk_buff *skb; 2566 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush)); 2567 2568 skb = nlmsg_new(len, GFP_ATOMIC); 2569 if (skb == NULL) 2570 return -ENOMEM; 2571 2572 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0); 2573 if (nlh == NULL) { 2574 kfree_skb(skb); 2575 return -EMSGSIZE; 2576 } 2577 2578 p = nlmsg_data(nlh); 2579 p->proto = c->data.proto; 2580 2581 nlmsg_end(skb, nlh); 2582 2583 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA); 2584 } 2585 2586 static inline size_t xfrm_sa_len(struct xfrm_state *x) 2587 { 2588 size_t l = 0; 2589 if (x->aead) 2590 l += nla_total_size(aead_len(x->aead)); 2591 if (x->aalg) { 2592 l += nla_total_size(sizeof(struct xfrm_algo) + 2593 (x->aalg->alg_key_len + 7) / 8); 2594 l += nla_total_size(xfrm_alg_auth_len(x->aalg)); 2595 } 2596 if (x->ealg) 2597 l += nla_total_size(xfrm_alg_len(x->ealg)); 2598 if (x->calg) 2599 l += nla_total_size(sizeof(*x->calg)); 2600 if (x->encap) 2601 l += nla_total_size(sizeof(*x->encap)); 2602 if (x->tfcpad) 2603 l += nla_total_size(sizeof(x->tfcpad)); 2604 if (x->replay_esn) 2605 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn)); 2606 else 2607 l += nla_total_size(sizeof(struct xfrm_replay_state)); 2608 if (x->security) 2609 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) + 2610 x->security->ctx_len); 2611 if (x->coaddr) 2612 l += nla_total_size(sizeof(*x->coaddr)); 2613 if (x->props.extra_flags) 2614 l += nla_total_size(sizeof(x->props.extra_flags)); 2615 2616 /* Must count x->lastused as it may become non-zero behind our back. */ 2617 l += nla_total_size(sizeof(u64)); 2618 2619 return l; 2620 } 2621 2622 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c) 2623 { 2624 struct net *net = xs_net(x); 2625 struct xfrm_usersa_info *p; 2626 struct xfrm_usersa_id *id; 2627 struct nlmsghdr *nlh; 2628 struct sk_buff *skb; 2629 int len = xfrm_sa_len(x); 2630 int headlen, err; 2631 2632 headlen = sizeof(*p); 2633 if (c->event == XFRM_MSG_DELSA) { 2634 len += nla_total_size(headlen); 2635 headlen = sizeof(*id); 2636 len += nla_total_size(sizeof(struct xfrm_mark)); 2637 } 2638 len += NLMSG_ALIGN(headlen); 2639 2640 skb = nlmsg_new(len, GFP_ATOMIC); 2641 if (skb == NULL) 2642 return -ENOMEM; 2643 2644 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); 2645 err = -EMSGSIZE; 2646 if (nlh == NULL) 2647 goto out_free_skb; 2648 2649 p = nlmsg_data(nlh); 2650 if (c->event == XFRM_MSG_DELSA) { 2651 struct nlattr *attr; 2652 2653 id = nlmsg_data(nlh); 2654 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr)); 2655 id->spi = x->id.spi; 2656 id->family = x->props.family; 2657 id->proto = x->id.proto; 2658 2659 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p)); 2660 err = -EMSGSIZE; 2661 if (attr == NULL) 2662 goto out_free_skb; 2663 2664 p = nla_data(attr); 2665 } 2666 err = copy_to_user_state_extra(x, p, skb); 2667 if (err) 2668 goto out_free_skb; 2669 2670 nlmsg_end(skb, nlh); 2671 2672 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA); 2673 2674 out_free_skb: 2675 kfree_skb(skb); 2676 return err; 2677 } 2678 2679 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c) 2680 { 2681 2682 switch (c->event) { 2683 case XFRM_MSG_EXPIRE: 2684 return xfrm_exp_state_notify(x, c); 2685 case XFRM_MSG_NEWAE: 2686 return xfrm_aevent_state_notify(x, c); 2687 case XFRM_MSG_DELSA: 2688 case XFRM_MSG_UPDSA: 2689 case XFRM_MSG_NEWSA: 2690 return xfrm_notify_sa(x, c); 2691 case XFRM_MSG_FLUSHSA: 2692 return xfrm_notify_sa_flush(c); 2693 default: 2694 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n", 2695 c->event); 2696 break; 2697 } 2698 2699 return 0; 2700 2701 } 2702 2703 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x, 2704 struct xfrm_policy *xp) 2705 { 2706 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire)) 2707 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 2708 + nla_total_size(sizeof(struct xfrm_mark)) 2709 + nla_total_size(xfrm_user_sec_ctx_size(x->security)) 2710 + userpolicy_type_attrsize(); 2711 } 2712 2713 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x, 2714 struct xfrm_tmpl *xt, struct xfrm_policy *xp) 2715 { 2716 __u32 seq = xfrm_get_acqseq(); 2717 struct xfrm_user_acquire *ua; 2718 struct nlmsghdr *nlh; 2719 int err; 2720 2721 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0); 2722 if (nlh == NULL) 2723 return -EMSGSIZE; 2724 2725 ua = nlmsg_data(nlh); 2726 memcpy(&ua->id, &x->id, sizeof(ua->id)); 2727 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr)); 2728 memcpy(&ua->sel, &x->sel, sizeof(ua->sel)); 2729 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT); 2730 ua->aalgos = xt->aalgos; 2731 ua->ealgos = xt->ealgos; 2732 ua->calgos = xt->calgos; 2733 ua->seq = x->km.seq = seq; 2734 2735 err = copy_to_user_tmpl(xp, skb); 2736 if (!err) 2737 err = copy_to_user_state_sec_ctx(x, skb); 2738 if (!err) 2739 err = copy_to_user_policy_type(xp->type, skb); 2740 if (!err) 2741 err = xfrm_mark_put(skb, &xp->mark); 2742 if (err) { 2743 nlmsg_cancel(skb, nlh); 2744 return err; 2745 } 2746 2747 nlmsg_end(skb, nlh); 2748 return 0; 2749 } 2750 2751 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt, 2752 struct xfrm_policy *xp) 2753 { 2754 struct net *net = xs_net(x); 2755 struct sk_buff *skb; 2756 2757 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC); 2758 if (skb == NULL) 2759 return -ENOMEM; 2760 2761 if (build_acquire(skb, x, xt, xp) < 0) 2762 BUG(); 2763 2764 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE); 2765 } 2766 2767 /* User gives us xfrm_user_policy_info followed by an array of 0 2768 * or more templates. 2769 */ 2770 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt, 2771 u8 *data, int len, int *dir) 2772 { 2773 struct net *net = sock_net(sk); 2774 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data; 2775 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1); 2776 struct xfrm_policy *xp; 2777 int nr; 2778 2779 switch (sk->sk_family) { 2780 case AF_INET: 2781 if (opt != IP_XFRM_POLICY) { 2782 *dir = -EOPNOTSUPP; 2783 return NULL; 2784 } 2785 break; 2786 #if IS_ENABLED(CONFIG_IPV6) 2787 case AF_INET6: 2788 if (opt != IPV6_XFRM_POLICY) { 2789 *dir = -EOPNOTSUPP; 2790 return NULL; 2791 } 2792 break; 2793 #endif 2794 default: 2795 *dir = -EINVAL; 2796 return NULL; 2797 } 2798 2799 *dir = -EINVAL; 2800 2801 if (len < sizeof(*p) || 2802 verify_newpolicy_info(p)) 2803 return NULL; 2804 2805 nr = ((len - sizeof(*p)) / sizeof(*ut)); 2806 if (validate_tmpl(nr, ut, p->sel.family)) 2807 return NULL; 2808 2809 if (p->dir > XFRM_POLICY_OUT) 2810 return NULL; 2811 2812 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 2813 if (xp == NULL) { 2814 *dir = -ENOBUFS; 2815 return NULL; 2816 } 2817 2818 copy_from_user_policy(xp, p); 2819 xp->type = XFRM_POLICY_TYPE_MAIN; 2820 copy_templates(xp, ut, nr); 2821 2822 *dir = p->dir; 2823 2824 return xp; 2825 } 2826 2827 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp) 2828 { 2829 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire)) 2830 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 2831 + nla_total_size(xfrm_user_sec_ctx_size(xp->security)) 2832 + nla_total_size(sizeof(struct xfrm_mark)) 2833 + userpolicy_type_attrsize(); 2834 } 2835 2836 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp, 2837 int dir, const struct km_event *c) 2838 { 2839 struct xfrm_user_polexpire *upe; 2840 int hard = c->data.hard; 2841 struct nlmsghdr *nlh; 2842 int err; 2843 2844 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0); 2845 if (nlh == NULL) 2846 return -EMSGSIZE; 2847 2848 upe = nlmsg_data(nlh); 2849 copy_to_user_policy(xp, &upe->pol, dir); 2850 err = copy_to_user_tmpl(xp, skb); 2851 if (!err) 2852 err = copy_to_user_sec_ctx(xp, skb); 2853 if (!err) 2854 err = copy_to_user_policy_type(xp->type, skb); 2855 if (!err) 2856 err = xfrm_mark_put(skb, &xp->mark); 2857 if (err) { 2858 nlmsg_cancel(skb, nlh); 2859 return err; 2860 } 2861 upe->hard = !!hard; 2862 2863 nlmsg_end(skb, nlh); 2864 return 0; 2865 } 2866 2867 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 2868 { 2869 struct net *net = xp_net(xp); 2870 struct sk_buff *skb; 2871 2872 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC); 2873 if (skb == NULL) 2874 return -ENOMEM; 2875 2876 if (build_polexpire(skb, xp, dir, c) < 0) 2877 BUG(); 2878 2879 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE); 2880 } 2881 2882 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) 2883 { 2884 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); 2885 struct net *net = xp_net(xp); 2886 struct xfrm_userpolicy_info *p; 2887 struct xfrm_userpolicy_id *id; 2888 struct nlmsghdr *nlh; 2889 struct sk_buff *skb; 2890 int headlen, err; 2891 2892 headlen = sizeof(*p); 2893 if (c->event == XFRM_MSG_DELPOLICY) { 2894 len += nla_total_size(headlen); 2895 headlen = sizeof(*id); 2896 } 2897 len += userpolicy_type_attrsize(); 2898 len += nla_total_size(sizeof(struct xfrm_mark)); 2899 len += NLMSG_ALIGN(headlen); 2900 2901 skb = nlmsg_new(len, GFP_ATOMIC); 2902 if (skb == NULL) 2903 return -ENOMEM; 2904 2905 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); 2906 err = -EMSGSIZE; 2907 if (nlh == NULL) 2908 goto out_free_skb; 2909 2910 p = nlmsg_data(nlh); 2911 if (c->event == XFRM_MSG_DELPOLICY) { 2912 struct nlattr *attr; 2913 2914 id = nlmsg_data(nlh); 2915 memset(id, 0, sizeof(*id)); 2916 id->dir = dir; 2917 if (c->data.byid) 2918 id->index = xp->index; 2919 else 2920 memcpy(&id->sel, &xp->selector, sizeof(id->sel)); 2921 2922 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p)); 2923 err = -EMSGSIZE; 2924 if (attr == NULL) 2925 goto out_free_skb; 2926 2927 p = nla_data(attr); 2928 } 2929 2930 copy_to_user_policy(xp, p, dir); 2931 err = copy_to_user_tmpl(xp, skb); 2932 if (!err) 2933 err = copy_to_user_policy_type(xp->type, skb); 2934 if (!err) 2935 err = xfrm_mark_put(skb, &xp->mark); 2936 if (err) 2937 goto out_free_skb; 2938 2939 nlmsg_end(skb, nlh); 2940 2941 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 2942 2943 out_free_skb: 2944 kfree_skb(skb); 2945 return err; 2946 } 2947 2948 static int xfrm_notify_policy_flush(const struct km_event *c) 2949 { 2950 struct net *net = c->net; 2951 struct nlmsghdr *nlh; 2952 struct sk_buff *skb; 2953 int err; 2954 2955 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC); 2956 if (skb == NULL) 2957 return -ENOMEM; 2958 2959 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0); 2960 err = -EMSGSIZE; 2961 if (nlh == NULL) 2962 goto out_free_skb; 2963 err = copy_to_user_policy_type(c->data.type, skb); 2964 if (err) 2965 goto out_free_skb; 2966 2967 nlmsg_end(skb, nlh); 2968 2969 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 2970 2971 out_free_skb: 2972 kfree_skb(skb); 2973 return err; 2974 } 2975 2976 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 2977 { 2978 2979 switch (c->event) { 2980 case XFRM_MSG_NEWPOLICY: 2981 case XFRM_MSG_UPDPOLICY: 2982 case XFRM_MSG_DELPOLICY: 2983 return xfrm_notify_policy(xp, dir, c); 2984 case XFRM_MSG_FLUSHPOLICY: 2985 return xfrm_notify_policy_flush(c); 2986 case XFRM_MSG_POLEXPIRE: 2987 return xfrm_exp_policy_notify(xp, dir, c); 2988 default: 2989 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n", 2990 c->event); 2991 } 2992 2993 return 0; 2994 2995 } 2996 2997 static inline size_t xfrm_report_msgsize(void) 2998 { 2999 return NLMSG_ALIGN(sizeof(struct xfrm_user_report)); 3000 } 3001 3002 static int build_report(struct sk_buff *skb, u8 proto, 3003 struct xfrm_selector *sel, xfrm_address_t *addr) 3004 { 3005 struct xfrm_user_report *ur; 3006 struct nlmsghdr *nlh; 3007 3008 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0); 3009 if (nlh == NULL) 3010 return -EMSGSIZE; 3011 3012 ur = nlmsg_data(nlh); 3013 ur->proto = proto; 3014 memcpy(&ur->sel, sel, sizeof(ur->sel)); 3015 3016 if (addr) { 3017 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr); 3018 if (err) { 3019 nlmsg_cancel(skb, nlh); 3020 return err; 3021 } 3022 } 3023 nlmsg_end(skb, nlh); 3024 return 0; 3025 } 3026 3027 static int xfrm_send_report(struct net *net, u8 proto, 3028 struct xfrm_selector *sel, xfrm_address_t *addr) 3029 { 3030 struct sk_buff *skb; 3031 3032 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC); 3033 if (skb == NULL) 3034 return -ENOMEM; 3035 3036 if (build_report(skb, proto, sel, addr) < 0) 3037 BUG(); 3038 3039 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT); 3040 } 3041 3042 static inline size_t xfrm_mapping_msgsize(void) 3043 { 3044 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping)); 3045 } 3046 3047 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x, 3048 xfrm_address_t *new_saddr, __be16 new_sport) 3049 { 3050 struct xfrm_user_mapping *um; 3051 struct nlmsghdr *nlh; 3052 3053 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0); 3054 if (nlh == NULL) 3055 return -EMSGSIZE; 3056 3057 um = nlmsg_data(nlh); 3058 3059 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr)); 3060 um->id.spi = x->id.spi; 3061 um->id.family = x->props.family; 3062 um->id.proto = x->id.proto; 3063 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr)); 3064 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr)); 3065 um->new_sport = new_sport; 3066 um->old_sport = x->encap->encap_sport; 3067 um->reqid = x->props.reqid; 3068 3069 nlmsg_end(skb, nlh); 3070 return 0; 3071 } 3072 3073 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, 3074 __be16 sport) 3075 { 3076 struct net *net = xs_net(x); 3077 struct sk_buff *skb; 3078 3079 if (x->id.proto != IPPROTO_ESP) 3080 return -EINVAL; 3081 3082 if (!x->encap) 3083 return -EINVAL; 3084 3085 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC); 3086 if (skb == NULL) 3087 return -ENOMEM; 3088 3089 if (build_mapping(skb, x, ipaddr, sport) < 0) 3090 BUG(); 3091 3092 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING); 3093 } 3094 3095 static bool xfrm_is_alive(const struct km_event *c) 3096 { 3097 return (bool)xfrm_acquire_is_on(c->net); 3098 } 3099 3100 static struct xfrm_mgr netlink_mgr = { 3101 .id = "netlink", 3102 .notify = xfrm_send_state_notify, 3103 .acquire = xfrm_send_acquire, 3104 .compile_policy = xfrm_compile_policy, 3105 .notify_policy = xfrm_send_policy_notify, 3106 .report = xfrm_send_report, 3107 .migrate = xfrm_send_migrate, 3108 .new_mapping = xfrm_send_mapping, 3109 .is_alive = xfrm_is_alive, 3110 }; 3111 3112 static int __net_init xfrm_user_net_init(struct net *net) 3113 { 3114 struct sock *nlsk; 3115 struct netlink_kernel_cfg cfg = { 3116 .groups = XFRMNLGRP_MAX, 3117 .input = xfrm_netlink_rcv, 3118 }; 3119 3120 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg); 3121 if (nlsk == NULL) 3122 return -ENOMEM; 3123 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */ 3124 rcu_assign_pointer(net->xfrm.nlsk, nlsk); 3125 return 0; 3126 } 3127 3128 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list) 3129 { 3130 struct net *net; 3131 list_for_each_entry(net, net_exit_list, exit_list) 3132 RCU_INIT_POINTER(net->xfrm.nlsk, NULL); 3133 synchronize_net(); 3134 list_for_each_entry(net, net_exit_list, exit_list) 3135 netlink_kernel_release(net->xfrm.nlsk_stash); 3136 } 3137 3138 static struct pernet_operations xfrm_user_net_ops = { 3139 .init = xfrm_user_net_init, 3140 .exit_batch = xfrm_user_net_exit, 3141 }; 3142 3143 static int __init xfrm_user_init(void) 3144 { 3145 int rv; 3146 3147 printk(KERN_INFO "Initializing XFRM netlink socket\n"); 3148 3149 rv = register_pernet_subsys(&xfrm_user_net_ops); 3150 if (rv < 0) 3151 return rv; 3152 rv = xfrm_register_km(&netlink_mgr); 3153 if (rv < 0) 3154 unregister_pernet_subsys(&xfrm_user_net_ops); 3155 return rv; 3156 } 3157 3158 static void __exit xfrm_user_exit(void) 3159 { 3160 xfrm_unregister_km(&netlink_mgr); 3161 unregister_pernet_subsys(&xfrm_user_net_ops); 3162 } 3163 3164 module_init(xfrm_user_init); 3165 module_exit(xfrm_user_exit); 3166 MODULE_LICENSE("GPL"); 3167 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM); 3168 3169