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