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