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