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 defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 32 #include <linux/in6.h> 33 #endif 34 35 static inline int aead_len(struct xfrm_algo_aead *alg) 36 { 37 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 38 } 39 40 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type) 41 { 42 struct nlattr *rt = attrs[type]; 43 struct xfrm_algo *algp; 44 45 if (!rt) 46 return 0; 47 48 algp = nla_data(rt); 49 if (nla_len(rt) < xfrm_alg_len(algp)) 50 return -EINVAL; 51 52 switch (type) { 53 case XFRMA_ALG_AUTH: 54 case XFRMA_ALG_CRYPT: 55 case XFRMA_ALG_COMP: 56 break; 57 58 default: 59 return -EINVAL; 60 } 61 62 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; 63 return 0; 64 } 65 66 static int verify_auth_trunc(struct nlattr **attrs) 67 { 68 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC]; 69 struct xfrm_algo_auth *algp; 70 71 if (!rt) 72 return 0; 73 74 algp = nla_data(rt); 75 if (nla_len(rt) < xfrm_alg_auth_len(algp)) 76 return -EINVAL; 77 78 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; 79 return 0; 80 } 81 82 static int verify_aead(struct nlattr **attrs) 83 { 84 struct nlattr *rt = attrs[XFRMA_ALG_AEAD]; 85 struct xfrm_algo_aead *algp; 86 87 if (!rt) 88 return 0; 89 90 algp = nla_data(rt); 91 if (nla_len(rt) < aead_len(algp)) 92 return -EINVAL; 93 94 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; 95 return 0; 96 } 97 98 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type, 99 xfrm_address_t **addrp) 100 { 101 struct nlattr *rt = attrs[type]; 102 103 if (rt && addrp) 104 *addrp = nla_data(rt); 105 } 106 107 static inline int verify_sec_ctx_len(struct nlattr **attrs) 108 { 109 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 110 struct xfrm_user_sec_ctx *uctx; 111 112 if (!rt) 113 return 0; 114 115 uctx = nla_data(rt); 116 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len)) 117 return -EINVAL; 118 119 return 0; 120 } 121 122 static inline int verify_replay(struct xfrm_usersa_info *p, 123 struct nlattr **attrs) 124 { 125 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL]; 126 127 if (!rt) 128 return 0; 129 130 if (p->id.proto != IPPROTO_ESP) 131 return -EINVAL; 132 133 if (p->replay_window != 0) 134 return -EINVAL; 135 136 return 0; 137 } 138 139 static int verify_newsa_info(struct xfrm_usersa_info *p, 140 struct nlattr **attrs) 141 { 142 int err; 143 144 err = -EINVAL; 145 switch (p->family) { 146 case AF_INET: 147 break; 148 149 case AF_INET6: 150 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 151 break; 152 #else 153 err = -EAFNOSUPPORT; 154 goto out; 155 #endif 156 157 default: 158 goto out; 159 } 160 161 err = -EINVAL; 162 switch (p->id.proto) { 163 case IPPROTO_AH: 164 if ((!attrs[XFRMA_ALG_AUTH] && 165 !attrs[XFRMA_ALG_AUTH_TRUNC]) || 166 attrs[XFRMA_ALG_AEAD] || 167 attrs[XFRMA_ALG_CRYPT] || 168 attrs[XFRMA_ALG_COMP] || 169 attrs[XFRMA_TFCPAD]) 170 goto out; 171 break; 172 173 case IPPROTO_ESP: 174 if (attrs[XFRMA_ALG_COMP]) 175 goto out; 176 if (!attrs[XFRMA_ALG_AUTH] && 177 !attrs[XFRMA_ALG_AUTH_TRUNC] && 178 !attrs[XFRMA_ALG_CRYPT] && 179 !attrs[XFRMA_ALG_AEAD]) 180 goto out; 181 if ((attrs[XFRMA_ALG_AUTH] || 182 attrs[XFRMA_ALG_AUTH_TRUNC] || 183 attrs[XFRMA_ALG_CRYPT]) && 184 attrs[XFRMA_ALG_AEAD]) 185 goto out; 186 if (attrs[XFRMA_TFCPAD] && 187 p->mode != XFRM_MODE_TUNNEL) 188 goto out; 189 break; 190 191 case IPPROTO_COMP: 192 if (!attrs[XFRMA_ALG_COMP] || 193 attrs[XFRMA_ALG_AEAD] || 194 attrs[XFRMA_ALG_AUTH] || 195 attrs[XFRMA_ALG_AUTH_TRUNC] || 196 attrs[XFRMA_ALG_CRYPT] || 197 attrs[XFRMA_TFCPAD]) 198 goto out; 199 break; 200 201 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 202 case IPPROTO_DSTOPTS: 203 case IPPROTO_ROUTING: 204 if (attrs[XFRMA_ALG_COMP] || 205 attrs[XFRMA_ALG_AUTH] || 206 attrs[XFRMA_ALG_AUTH_TRUNC] || 207 attrs[XFRMA_ALG_AEAD] || 208 attrs[XFRMA_ALG_CRYPT] || 209 attrs[XFRMA_ENCAP] || 210 attrs[XFRMA_SEC_CTX] || 211 attrs[XFRMA_TFCPAD] || 212 !attrs[XFRMA_COADDR]) 213 goto out; 214 break; 215 #endif 216 217 default: 218 goto out; 219 } 220 221 if ((err = verify_aead(attrs))) 222 goto out; 223 if ((err = verify_auth_trunc(attrs))) 224 goto out; 225 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH))) 226 goto out; 227 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT))) 228 goto out; 229 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP))) 230 goto out; 231 if ((err = verify_sec_ctx_len(attrs))) 232 goto out; 233 if ((err = verify_replay(p, attrs))) 234 goto out; 235 236 err = -EINVAL; 237 switch (p->mode) { 238 case XFRM_MODE_TRANSPORT: 239 case XFRM_MODE_TUNNEL: 240 case XFRM_MODE_ROUTEOPTIMIZATION: 241 case XFRM_MODE_BEET: 242 break; 243 244 default: 245 goto out; 246 } 247 248 err = 0; 249 250 out: 251 return err; 252 } 253 254 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props, 255 struct xfrm_algo_desc *(*get_byname)(const char *, int), 256 struct nlattr *rta) 257 { 258 struct xfrm_algo *p, *ualg; 259 struct xfrm_algo_desc *algo; 260 261 if (!rta) 262 return 0; 263 264 ualg = nla_data(rta); 265 266 algo = get_byname(ualg->alg_name, 1); 267 if (!algo) 268 return -ENOSYS; 269 *props = algo->desc.sadb_alg_id; 270 271 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL); 272 if (!p) 273 return -ENOMEM; 274 275 strcpy(p->alg_name, algo->name); 276 *algpp = p; 277 return 0; 278 } 279 280 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props, 281 struct nlattr *rta) 282 { 283 struct xfrm_algo *ualg; 284 struct xfrm_algo_auth *p; 285 struct xfrm_algo_desc *algo; 286 287 if (!rta) 288 return 0; 289 290 ualg = nla_data(rta); 291 292 algo = xfrm_aalg_get_byname(ualg->alg_name, 1); 293 if (!algo) 294 return -ENOSYS; 295 *props = algo->desc.sadb_alg_id; 296 297 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL); 298 if (!p) 299 return -ENOMEM; 300 301 strcpy(p->alg_name, algo->name); 302 p->alg_key_len = ualg->alg_key_len; 303 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; 304 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8); 305 306 *algpp = p; 307 return 0; 308 } 309 310 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props, 311 struct nlattr *rta) 312 { 313 struct xfrm_algo_auth *p, *ualg; 314 struct xfrm_algo_desc *algo; 315 316 if (!rta) 317 return 0; 318 319 ualg = nla_data(rta); 320 321 algo = xfrm_aalg_get_byname(ualg->alg_name, 1); 322 if (!algo) 323 return -ENOSYS; 324 if ((ualg->alg_trunc_len / 8) > MAX_AH_AUTH_LEN || 325 ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits) 326 return -EINVAL; 327 *props = algo->desc.sadb_alg_id; 328 329 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL); 330 if (!p) 331 return -ENOMEM; 332 333 strcpy(p->alg_name, algo->name); 334 if (!p->alg_trunc_len) 335 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; 336 337 *algpp = p; 338 return 0; 339 } 340 341 static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props, 342 struct nlattr *rta) 343 { 344 struct xfrm_algo_aead *p, *ualg; 345 struct xfrm_algo_desc *algo; 346 347 if (!rta) 348 return 0; 349 350 ualg = nla_data(rta); 351 352 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1); 353 if (!algo) 354 return -ENOSYS; 355 *props = algo->desc.sadb_alg_id; 356 357 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL); 358 if (!p) 359 return -ENOMEM; 360 361 strcpy(p->alg_name, algo->name); 362 *algpp = p; 363 return 0; 364 } 365 366 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn, 367 struct nlattr *rp) 368 { 369 struct xfrm_replay_state_esn *up; 370 371 if (!replay_esn || !rp) 372 return 0; 373 374 up = nla_data(rp); 375 376 if (xfrm_replay_state_esn_len(replay_esn) != 377 xfrm_replay_state_esn_len(up)) 378 return -EINVAL; 379 380 return 0; 381 } 382 383 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn, 384 struct xfrm_replay_state_esn **preplay_esn, 385 struct nlattr *rta) 386 { 387 struct xfrm_replay_state_esn *p, *pp, *up; 388 389 if (!rta) 390 return 0; 391 392 up = nla_data(rta); 393 394 p = kmemdup(up, xfrm_replay_state_esn_len(up), GFP_KERNEL); 395 if (!p) 396 return -ENOMEM; 397 398 pp = kmemdup(up, xfrm_replay_state_esn_len(up), GFP_KERNEL); 399 if (!pp) { 400 kfree(p); 401 return -ENOMEM; 402 } 403 404 *replay_esn = p; 405 *preplay_esn = pp; 406 407 return 0; 408 } 409 410 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx) 411 { 412 int len = 0; 413 414 if (xfrm_ctx) { 415 len += sizeof(struct xfrm_user_sec_ctx); 416 len += xfrm_ctx->ctx_len; 417 } 418 return len; 419 } 420 421 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 422 { 423 memcpy(&x->id, &p->id, sizeof(x->id)); 424 memcpy(&x->sel, &p->sel, sizeof(x->sel)); 425 memcpy(&x->lft, &p->lft, sizeof(x->lft)); 426 x->props.mode = p->mode; 427 x->props.replay_window = p->replay_window; 428 x->props.reqid = p->reqid; 429 x->props.family = p->family; 430 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr)); 431 x->props.flags = p->flags; 432 433 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC)) 434 x->sel.family = p->family; 435 } 436 437 /* 438 * someday when pfkey also has support, we could have the code 439 * somehow made shareable and move it to xfrm_state.c - JHS 440 * 441 */ 442 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs) 443 { 444 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 445 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL]; 446 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 447 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; 448 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; 449 450 if (re) { 451 struct xfrm_replay_state_esn *replay_esn; 452 replay_esn = nla_data(re); 453 memcpy(x->replay_esn, replay_esn, 454 xfrm_replay_state_esn_len(replay_esn)); 455 memcpy(x->preplay_esn, replay_esn, 456 xfrm_replay_state_esn_len(replay_esn)); 457 } 458 459 if (rp) { 460 struct xfrm_replay_state *replay; 461 replay = nla_data(rp); 462 memcpy(&x->replay, replay, sizeof(*replay)); 463 memcpy(&x->preplay, replay, sizeof(*replay)); 464 } 465 466 if (lt) { 467 struct xfrm_lifetime_cur *ltime; 468 ltime = nla_data(lt); 469 x->curlft.bytes = ltime->bytes; 470 x->curlft.packets = ltime->packets; 471 x->curlft.add_time = ltime->add_time; 472 x->curlft.use_time = ltime->use_time; 473 } 474 475 if (et) 476 x->replay_maxage = nla_get_u32(et); 477 478 if (rt) 479 x->replay_maxdiff = nla_get_u32(rt); 480 } 481 482 static struct xfrm_state *xfrm_state_construct(struct net *net, 483 struct xfrm_usersa_info *p, 484 struct nlattr **attrs, 485 int *errp) 486 { 487 struct xfrm_state *x = xfrm_state_alloc(net); 488 int err = -ENOMEM; 489 490 if (!x) 491 goto error_no_put; 492 493 copy_from_user_state(x, p); 494 495 if ((err = attach_aead(&x->aead, &x->props.ealgo, 496 attrs[XFRMA_ALG_AEAD]))) 497 goto error; 498 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo, 499 attrs[XFRMA_ALG_AUTH_TRUNC]))) 500 goto error; 501 if (!x->props.aalgo) { 502 if ((err = attach_auth(&x->aalg, &x->props.aalgo, 503 attrs[XFRMA_ALG_AUTH]))) 504 goto error; 505 } 506 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo, 507 xfrm_ealg_get_byname, 508 attrs[XFRMA_ALG_CRYPT]))) 509 goto error; 510 if ((err = attach_one_algo(&x->calg, &x->props.calgo, 511 xfrm_calg_get_byname, 512 attrs[XFRMA_ALG_COMP]))) 513 goto error; 514 515 if (attrs[XFRMA_ENCAP]) { 516 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]), 517 sizeof(*x->encap), GFP_KERNEL); 518 if (x->encap == NULL) 519 goto error; 520 } 521 522 if (attrs[XFRMA_TFCPAD]) 523 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]); 524 525 if (attrs[XFRMA_COADDR]) { 526 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]), 527 sizeof(*x->coaddr), GFP_KERNEL); 528 if (x->coaddr == NULL) 529 goto error; 530 } 531 532 xfrm_mark_get(attrs, &x->mark); 533 534 err = __xfrm_init_state(x, false); 535 if (err) 536 goto error; 537 538 if (attrs[XFRMA_SEC_CTX] && 539 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX]))) 540 goto error; 541 542 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn, 543 attrs[XFRMA_REPLAY_ESN_VAL]))) 544 goto error; 545 546 x->km.seq = p->seq; 547 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth; 548 /* sysctl_xfrm_aevent_etime is in 100ms units */ 549 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M; 550 551 if ((err = xfrm_init_replay(x))) 552 goto error; 553 554 /* override default values from above */ 555 xfrm_update_ae_params(x, attrs); 556 557 return x; 558 559 error: 560 x->km.state = XFRM_STATE_DEAD; 561 xfrm_state_put(x); 562 error_no_put: 563 *errp = err; 564 return NULL; 565 } 566 567 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 568 struct nlattr **attrs) 569 { 570 struct net *net = sock_net(skb->sk); 571 struct xfrm_usersa_info *p = nlmsg_data(nlh); 572 struct xfrm_state *x; 573 int err; 574 struct km_event c; 575 uid_t loginuid = audit_get_loginuid(current); 576 u32 sessionid = audit_get_sessionid(current); 577 u32 sid; 578 579 err = verify_newsa_info(p, attrs); 580 if (err) 581 return err; 582 583 x = xfrm_state_construct(net, p, attrs, &err); 584 if (!x) 585 return err; 586 587 xfrm_state_hold(x); 588 if (nlh->nlmsg_type == XFRM_MSG_NEWSA) 589 err = xfrm_state_add(x); 590 else 591 err = xfrm_state_update(x); 592 593 security_task_getsecid(current, &sid); 594 xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid); 595 596 if (err < 0) { 597 x->km.state = XFRM_STATE_DEAD; 598 __xfrm_state_put(x); 599 goto out; 600 } 601 602 c.seq = nlh->nlmsg_seq; 603 c.pid = nlh->nlmsg_pid; 604 c.event = nlh->nlmsg_type; 605 606 km_state_notify(x, &c); 607 out: 608 xfrm_state_put(x); 609 return err; 610 } 611 612 static struct xfrm_state *xfrm_user_state_lookup(struct net *net, 613 struct xfrm_usersa_id *p, 614 struct nlattr **attrs, 615 int *errp) 616 { 617 struct xfrm_state *x = NULL; 618 struct xfrm_mark m; 619 int err; 620 u32 mark = xfrm_mark_get(attrs, &m); 621 622 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) { 623 err = -ESRCH; 624 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family); 625 } else { 626 xfrm_address_t *saddr = NULL; 627 628 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr); 629 if (!saddr) { 630 err = -EINVAL; 631 goto out; 632 } 633 634 err = -ESRCH; 635 x = xfrm_state_lookup_byaddr(net, mark, 636 &p->daddr, saddr, 637 p->proto, p->family); 638 } 639 640 out: 641 if (!x && errp) 642 *errp = err; 643 return x; 644 } 645 646 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 647 struct nlattr **attrs) 648 { 649 struct net *net = sock_net(skb->sk); 650 struct xfrm_state *x; 651 int err = -ESRCH; 652 struct km_event c; 653 struct xfrm_usersa_id *p = nlmsg_data(nlh); 654 uid_t loginuid = audit_get_loginuid(current); 655 u32 sessionid = audit_get_sessionid(current); 656 u32 sid; 657 658 x = xfrm_user_state_lookup(net, p, attrs, &err); 659 if (x == NULL) 660 return err; 661 662 if ((err = security_xfrm_state_delete(x)) != 0) 663 goto out; 664 665 if (xfrm_state_kern(x)) { 666 err = -EPERM; 667 goto out; 668 } 669 670 err = xfrm_state_delete(x); 671 672 if (err < 0) 673 goto out; 674 675 c.seq = nlh->nlmsg_seq; 676 c.pid = nlh->nlmsg_pid; 677 c.event = nlh->nlmsg_type; 678 km_state_notify(x, &c); 679 680 out: 681 security_task_getsecid(current, &sid); 682 xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid); 683 xfrm_state_put(x); 684 return err; 685 } 686 687 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 688 { 689 memcpy(&p->id, &x->id, sizeof(p->id)); 690 memcpy(&p->sel, &x->sel, sizeof(p->sel)); 691 memcpy(&p->lft, &x->lft, sizeof(p->lft)); 692 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft)); 693 memcpy(&p->stats, &x->stats, sizeof(p->stats)); 694 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr)); 695 p->mode = x->props.mode; 696 p->replay_window = x->props.replay_window; 697 p->reqid = x->props.reqid; 698 p->family = x->props.family; 699 p->flags = x->props.flags; 700 p->seq = x->km.seq; 701 } 702 703 struct xfrm_dump_info { 704 struct sk_buff *in_skb; 705 struct sk_buff *out_skb; 706 u32 nlmsg_seq; 707 u16 nlmsg_flags; 708 }; 709 710 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb) 711 { 712 struct xfrm_user_sec_ctx *uctx; 713 struct nlattr *attr; 714 int ctx_size = sizeof(*uctx) + s->ctx_len; 715 716 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size); 717 if (attr == NULL) 718 return -EMSGSIZE; 719 720 uctx = nla_data(attr); 721 uctx->exttype = XFRMA_SEC_CTX; 722 uctx->len = ctx_size; 723 uctx->ctx_doi = s->ctx_doi; 724 uctx->ctx_alg = s->ctx_alg; 725 uctx->ctx_len = s->ctx_len; 726 memcpy(uctx + 1, s->ctx_str, s->ctx_len); 727 728 return 0; 729 } 730 731 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb) 732 { 733 struct xfrm_algo *algo; 734 struct nlattr *nla; 735 736 nla = nla_reserve(skb, XFRMA_ALG_AUTH, 737 sizeof(*algo) + (auth->alg_key_len + 7) / 8); 738 if (!nla) 739 return -EMSGSIZE; 740 741 algo = nla_data(nla); 742 strcpy(algo->alg_name, auth->alg_name); 743 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8); 744 algo->alg_key_len = auth->alg_key_len; 745 746 return 0; 747 } 748 749 /* Don't change this without updating xfrm_sa_len! */ 750 static int copy_to_user_state_extra(struct xfrm_state *x, 751 struct xfrm_usersa_info *p, 752 struct sk_buff *skb) 753 { 754 copy_to_user_state(x, p); 755 756 if (x->coaddr) 757 NLA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr); 758 759 if (x->lastused) 760 NLA_PUT_U64(skb, XFRMA_LASTUSED, x->lastused); 761 762 if (x->aead) 763 NLA_PUT(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead); 764 if (x->aalg) { 765 if (copy_to_user_auth(x->aalg, skb)) 766 goto nla_put_failure; 767 768 NLA_PUT(skb, XFRMA_ALG_AUTH_TRUNC, 769 xfrm_alg_auth_len(x->aalg), x->aalg); 770 } 771 if (x->ealg) 772 NLA_PUT(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg); 773 if (x->calg) 774 NLA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg); 775 776 if (x->encap) 777 NLA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap); 778 779 if (x->tfcpad) 780 NLA_PUT_U32(skb, XFRMA_TFCPAD, x->tfcpad); 781 782 if (xfrm_mark_put(skb, &x->mark)) 783 goto nla_put_failure; 784 785 if (x->replay_esn) 786 NLA_PUT(skb, XFRMA_REPLAY_ESN_VAL, 787 xfrm_replay_state_esn_len(x->replay_esn), x->replay_esn); 788 789 if (x->security && copy_sec_ctx(x->security, skb) < 0) 790 goto nla_put_failure; 791 792 return 0; 793 794 nla_put_failure: 795 return -EMSGSIZE; 796 } 797 798 static int dump_one_state(struct xfrm_state *x, int count, void *ptr) 799 { 800 struct xfrm_dump_info *sp = ptr; 801 struct sk_buff *in_skb = sp->in_skb; 802 struct sk_buff *skb = sp->out_skb; 803 struct xfrm_usersa_info *p; 804 struct nlmsghdr *nlh; 805 int err; 806 807 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq, 808 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags); 809 if (nlh == NULL) 810 return -EMSGSIZE; 811 812 p = nlmsg_data(nlh); 813 814 err = copy_to_user_state_extra(x, p, skb); 815 if (err) 816 goto nla_put_failure; 817 818 nlmsg_end(skb, nlh); 819 return 0; 820 821 nla_put_failure: 822 nlmsg_cancel(skb, nlh); 823 return err; 824 } 825 826 static int xfrm_dump_sa_done(struct netlink_callback *cb) 827 { 828 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 829 xfrm_state_walk_done(walk); 830 return 0; 831 } 832 833 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb) 834 { 835 struct net *net = sock_net(skb->sk); 836 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 837 struct xfrm_dump_info info; 838 839 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) > 840 sizeof(cb->args) - sizeof(cb->args[0])); 841 842 info.in_skb = cb->skb; 843 info.out_skb = skb; 844 info.nlmsg_seq = cb->nlh->nlmsg_seq; 845 info.nlmsg_flags = NLM_F_MULTI; 846 847 if (!cb->args[0]) { 848 cb->args[0] = 1; 849 xfrm_state_walk_init(walk, 0); 850 } 851 852 (void) xfrm_state_walk(net, walk, dump_one_state, &info); 853 854 return skb->len; 855 } 856 857 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb, 858 struct xfrm_state *x, u32 seq) 859 { 860 struct xfrm_dump_info info; 861 struct sk_buff *skb; 862 863 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 864 if (!skb) 865 return ERR_PTR(-ENOMEM); 866 867 info.in_skb = in_skb; 868 info.out_skb = skb; 869 info.nlmsg_seq = seq; 870 info.nlmsg_flags = 0; 871 872 if (dump_one_state(x, 0, &info)) { 873 kfree_skb(skb); 874 return NULL; 875 } 876 877 return skb; 878 } 879 880 static inline size_t xfrm_spdinfo_msgsize(void) 881 { 882 return NLMSG_ALIGN(4) 883 + nla_total_size(sizeof(struct xfrmu_spdinfo)) 884 + nla_total_size(sizeof(struct xfrmu_spdhinfo)); 885 } 886 887 static int build_spdinfo(struct sk_buff *skb, struct net *net, 888 u32 pid, u32 seq, u32 flags) 889 { 890 struct xfrmk_spdinfo si; 891 struct xfrmu_spdinfo spc; 892 struct xfrmu_spdhinfo sph; 893 struct nlmsghdr *nlh; 894 u32 *f; 895 896 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0); 897 if (nlh == NULL) /* shouldn't really happen ... */ 898 return -EMSGSIZE; 899 900 f = nlmsg_data(nlh); 901 *f = flags; 902 xfrm_spd_getinfo(net, &si); 903 spc.incnt = si.incnt; 904 spc.outcnt = si.outcnt; 905 spc.fwdcnt = si.fwdcnt; 906 spc.inscnt = si.inscnt; 907 spc.outscnt = si.outscnt; 908 spc.fwdscnt = si.fwdscnt; 909 sph.spdhcnt = si.spdhcnt; 910 sph.spdhmcnt = si.spdhmcnt; 911 912 NLA_PUT(skb, XFRMA_SPD_INFO, sizeof(spc), &spc); 913 NLA_PUT(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph); 914 915 return nlmsg_end(skb, nlh); 916 917 nla_put_failure: 918 nlmsg_cancel(skb, nlh); 919 return -EMSGSIZE; 920 } 921 922 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 923 struct nlattr **attrs) 924 { 925 struct net *net = sock_net(skb->sk); 926 struct sk_buff *r_skb; 927 u32 *flags = nlmsg_data(nlh); 928 u32 spid = NETLINK_CB(skb).pid; 929 u32 seq = nlh->nlmsg_seq; 930 931 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC); 932 if (r_skb == NULL) 933 return -ENOMEM; 934 935 if (build_spdinfo(r_skb, net, spid, seq, *flags) < 0) 936 BUG(); 937 938 return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid); 939 } 940 941 static inline size_t xfrm_sadinfo_msgsize(void) 942 { 943 return NLMSG_ALIGN(4) 944 + nla_total_size(sizeof(struct xfrmu_sadhinfo)) 945 + nla_total_size(4); /* XFRMA_SAD_CNT */ 946 } 947 948 static int build_sadinfo(struct sk_buff *skb, struct net *net, 949 u32 pid, u32 seq, u32 flags) 950 { 951 struct xfrmk_sadinfo si; 952 struct xfrmu_sadhinfo sh; 953 struct nlmsghdr *nlh; 954 u32 *f; 955 956 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0); 957 if (nlh == NULL) /* shouldn't really happen ... */ 958 return -EMSGSIZE; 959 960 f = nlmsg_data(nlh); 961 *f = flags; 962 xfrm_sad_getinfo(net, &si); 963 964 sh.sadhmcnt = si.sadhmcnt; 965 sh.sadhcnt = si.sadhcnt; 966 967 NLA_PUT_U32(skb, XFRMA_SAD_CNT, si.sadcnt); 968 NLA_PUT(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh); 969 970 return nlmsg_end(skb, nlh); 971 972 nla_put_failure: 973 nlmsg_cancel(skb, nlh); 974 return -EMSGSIZE; 975 } 976 977 static int xfrm_get_sadinfo(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 spid = NETLINK_CB(skb).pid; 984 u32 seq = nlh->nlmsg_seq; 985 986 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC); 987 if (r_skb == NULL) 988 return -ENOMEM; 989 990 if (build_sadinfo(r_skb, net, spid, seq, *flags) < 0) 991 BUG(); 992 993 return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid); 994 } 995 996 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 997 struct nlattr **attrs) 998 { 999 struct net *net = sock_net(skb->sk); 1000 struct xfrm_usersa_id *p = nlmsg_data(nlh); 1001 struct xfrm_state *x; 1002 struct sk_buff *resp_skb; 1003 int err = -ESRCH; 1004 1005 x = xfrm_user_state_lookup(net, p, attrs, &err); 1006 if (x == NULL) 1007 goto out_noput; 1008 1009 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 1010 if (IS_ERR(resp_skb)) { 1011 err = PTR_ERR(resp_skb); 1012 } else { 1013 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid); 1014 } 1015 xfrm_state_put(x); 1016 out_noput: 1017 return err; 1018 } 1019 1020 static int verify_userspi_info(struct xfrm_userspi_info *p) 1021 { 1022 switch (p->info.id.proto) { 1023 case IPPROTO_AH: 1024 case IPPROTO_ESP: 1025 break; 1026 1027 case IPPROTO_COMP: 1028 /* IPCOMP spi is 16-bits. */ 1029 if (p->max >= 0x10000) 1030 return -EINVAL; 1031 break; 1032 1033 default: 1034 return -EINVAL; 1035 } 1036 1037 if (p->min > p->max) 1038 return -EINVAL; 1039 1040 return 0; 1041 } 1042 1043 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, 1044 struct nlattr **attrs) 1045 { 1046 struct net *net = sock_net(skb->sk); 1047 struct xfrm_state *x; 1048 struct xfrm_userspi_info *p; 1049 struct sk_buff *resp_skb; 1050 xfrm_address_t *daddr; 1051 int family; 1052 int err; 1053 u32 mark; 1054 struct xfrm_mark m; 1055 1056 p = nlmsg_data(nlh); 1057 err = verify_userspi_info(p); 1058 if (err) 1059 goto out_noput; 1060 1061 family = p->info.family; 1062 daddr = &p->info.id.daddr; 1063 1064 x = NULL; 1065 1066 mark = xfrm_mark_get(attrs, &m); 1067 if (p->info.seq) { 1068 x = xfrm_find_acq_byseq(net, mark, p->info.seq); 1069 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) { 1070 xfrm_state_put(x); 1071 x = NULL; 1072 } 1073 } 1074 1075 if (!x) 1076 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid, 1077 p->info.id.proto, daddr, 1078 &p->info.saddr, 1, 1079 family); 1080 err = -ENOENT; 1081 if (x == NULL) 1082 goto out_noput; 1083 1084 err = xfrm_alloc_spi(x, p->min, p->max); 1085 if (err) 1086 goto out; 1087 1088 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 1089 if (IS_ERR(resp_skb)) { 1090 err = PTR_ERR(resp_skb); 1091 goto out; 1092 } 1093 1094 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid); 1095 1096 out: 1097 xfrm_state_put(x); 1098 out_noput: 1099 return err; 1100 } 1101 1102 static int verify_policy_dir(u8 dir) 1103 { 1104 switch (dir) { 1105 case XFRM_POLICY_IN: 1106 case XFRM_POLICY_OUT: 1107 case XFRM_POLICY_FWD: 1108 break; 1109 1110 default: 1111 return -EINVAL; 1112 } 1113 1114 return 0; 1115 } 1116 1117 static int verify_policy_type(u8 type) 1118 { 1119 switch (type) { 1120 case XFRM_POLICY_TYPE_MAIN: 1121 #ifdef CONFIG_XFRM_SUB_POLICY 1122 case XFRM_POLICY_TYPE_SUB: 1123 #endif 1124 break; 1125 1126 default: 1127 return -EINVAL; 1128 } 1129 1130 return 0; 1131 } 1132 1133 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p) 1134 { 1135 switch (p->share) { 1136 case XFRM_SHARE_ANY: 1137 case XFRM_SHARE_SESSION: 1138 case XFRM_SHARE_USER: 1139 case XFRM_SHARE_UNIQUE: 1140 break; 1141 1142 default: 1143 return -EINVAL; 1144 } 1145 1146 switch (p->action) { 1147 case XFRM_POLICY_ALLOW: 1148 case XFRM_POLICY_BLOCK: 1149 break; 1150 1151 default: 1152 return -EINVAL; 1153 } 1154 1155 switch (p->sel.family) { 1156 case AF_INET: 1157 break; 1158 1159 case AF_INET6: 1160 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1161 break; 1162 #else 1163 return -EAFNOSUPPORT; 1164 #endif 1165 1166 default: 1167 return -EINVAL; 1168 } 1169 1170 return verify_policy_dir(p->dir); 1171 } 1172 1173 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs) 1174 { 1175 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1176 struct xfrm_user_sec_ctx *uctx; 1177 1178 if (!rt) 1179 return 0; 1180 1181 uctx = nla_data(rt); 1182 return security_xfrm_policy_alloc(&pol->security, uctx); 1183 } 1184 1185 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut, 1186 int nr) 1187 { 1188 int i; 1189 1190 xp->xfrm_nr = nr; 1191 for (i = 0; i < nr; i++, ut++) { 1192 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 1193 1194 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id)); 1195 memcpy(&t->saddr, &ut->saddr, 1196 sizeof(xfrm_address_t)); 1197 t->reqid = ut->reqid; 1198 t->mode = ut->mode; 1199 t->share = ut->share; 1200 t->optional = ut->optional; 1201 t->aalgos = ut->aalgos; 1202 t->ealgos = ut->ealgos; 1203 t->calgos = ut->calgos; 1204 /* If all masks are ~0, then we allow all algorithms. */ 1205 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos); 1206 t->encap_family = ut->family; 1207 } 1208 } 1209 1210 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family) 1211 { 1212 int i; 1213 1214 if (nr > XFRM_MAX_DEPTH) 1215 return -EINVAL; 1216 1217 for (i = 0; i < nr; i++) { 1218 /* We never validated the ut->family value, so many 1219 * applications simply leave it at zero. The check was 1220 * never made and ut->family was ignored because all 1221 * templates could be assumed to have the same family as 1222 * the policy itself. Now that we will have ipv4-in-ipv6 1223 * and ipv6-in-ipv4 tunnels, this is no longer true. 1224 */ 1225 if (!ut[i].family) 1226 ut[i].family = family; 1227 1228 switch (ut[i].family) { 1229 case AF_INET: 1230 break; 1231 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1232 case AF_INET6: 1233 break; 1234 #endif 1235 default: 1236 return -EINVAL; 1237 } 1238 } 1239 1240 return 0; 1241 } 1242 1243 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs) 1244 { 1245 struct nlattr *rt = attrs[XFRMA_TMPL]; 1246 1247 if (!rt) { 1248 pol->xfrm_nr = 0; 1249 } else { 1250 struct xfrm_user_tmpl *utmpl = nla_data(rt); 1251 int nr = nla_len(rt) / sizeof(*utmpl); 1252 int err; 1253 1254 err = validate_tmpl(nr, utmpl, pol->family); 1255 if (err) 1256 return err; 1257 1258 copy_templates(pol, utmpl, nr); 1259 } 1260 return 0; 1261 } 1262 1263 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs) 1264 { 1265 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE]; 1266 struct xfrm_userpolicy_type *upt; 1267 u8 type = XFRM_POLICY_TYPE_MAIN; 1268 int err; 1269 1270 if (rt) { 1271 upt = nla_data(rt); 1272 type = upt->type; 1273 } 1274 1275 err = verify_policy_type(type); 1276 if (err) 1277 return err; 1278 1279 *tp = type; 1280 return 0; 1281 } 1282 1283 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p) 1284 { 1285 xp->priority = p->priority; 1286 xp->index = p->index; 1287 memcpy(&xp->selector, &p->sel, sizeof(xp->selector)); 1288 memcpy(&xp->lft, &p->lft, sizeof(xp->lft)); 1289 xp->action = p->action; 1290 xp->flags = p->flags; 1291 xp->family = p->sel.family; 1292 /* XXX xp->share = p->share; */ 1293 } 1294 1295 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir) 1296 { 1297 memcpy(&p->sel, &xp->selector, sizeof(p->sel)); 1298 memcpy(&p->lft, &xp->lft, sizeof(p->lft)); 1299 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft)); 1300 p->priority = xp->priority; 1301 p->index = xp->index; 1302 p->sel.family = xp->family; 1303 p->dir = dir; 1304 p->action = xp->action; 1305 p->flags = xp->flags; 1306 p->share = XFRM_SHARE_ANY; /* XXX xp->share */ 1307 } 1308 1309 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp) 1310 { 1311 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL); 1312 int err; 1313 1314 if (!xp) { 1315 *errp = -ENOMEM; 1316 return NULL; 1317 } 1318 1319 copy_from_user_policy(xp, p); 1320 1321 err = copy_from_user_policy_type(&xp->type, attrs); 1322 if (err) 1323 goto error; 1324 1325 if (!(err = copy_from_user_tmpl(xp, attrs))) 1326 err = copy_from_user_sec_ctx(xp, attrs); 1327 if (err) 1328 goto error; 1329 1330 xfrm_mark_get(attrs, &xp->mark); 1331 1332 return xp; 1333 error: 1334 *errp = err; 1335 xp->walk.dead = 1; 1336 xfrm_policy_destroy(xp); 1337 return NULL; 1338 } 1339 1340 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1341 struct nlattr **attrs) 1342 { 1343 struct net *net = sock_net(skb->sk); 1344 struct xfrm_userpolicy_info *p = nlmsg_data(nlh); 1345 struct xfrm_policy *xp; 1346 struct km_event c; 1347 int err; 1348 int excl; 1349 uid_t loginuid = audit_get_loginuid(current); 1350 u32 sessionid = audit_get_sessionid(current); 1351 u32 sid; 1352 1353 err = verify_newpolicy_info(p); 1354 if (err) 1355 return err; 1356 err = verify_sec_ctx_len(attrs); 1357 if (err) 1358 return err; 1359 1360 xp = xfrm_policy_construct(net, p, attrs, &err); 1361 if (!xp) 1362 return err; 1363 1364 /* shouldn't excl be based on nlh flags?? 1365 * Aha! this is anti-netlink really i.e more pfkey derived 1366 * in netlink excl is a flag and you wouldnt need 1367 * a type XFRM_MSG_UPDPOLICY - JHS */ 1368 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY; 1369 err = xfrm_policy_insert(p->dir, xp, excl); 1370 security_task_getsecid(current, &sid); 1371 xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid); 1372 1373 if (err) { 1374 security_xfrm_policy_free(xp->security); 1375 kfree(xp); 1376 return err; 1377 } 1378 1379 c.event = nlh->nlmsg_type; 1380 c.seq = nlh->nlmsg_seq; 1381 c.pid = nlh->nlmsg_pid; 1382 km_policy_notify(xp, p->dir, &c); 1383 1384 xfrm_pol_put(xp); 1385 1386 return 0; 1387 } 1388 1389 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb) 1390 { 1391 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH]; 1392 int i; 1393 1394 if (xp->xfrm_nr == 0) 1395 return 0; 1396 1397 for (i = 0; i < xp->xfrm_nr; i++) { 1398 struct xfrm_user_tmpl *up = &vec[i]; 1399 struct xfrm_tmpl *kp = &xp->xfrm_vec[i]; 1400 1401 memcpy(&up->id, &kp->id, sizeof(up->id)); 1402 up->family = kp->encap_family; 1403 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr)); 1404 up->reqid = kp->reqid; 1405 up->mode = kp->mode; 1406 up->share = kp->share; 1407 up->optional = kp->optional; 1408 up->aalgos = kp->aalgos; 1409 up->ealgos = kp->ealgos; 1410 up->calgos = kp->calgos; 1411 } 1412 1413 return nla_put(skb, XFRMA_TMPL, 1414 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec); 1415 } 1416 1417 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb) 1418 { 1419 if (x->security) { 1420 return copy_sec_ctx(x->security, skb); 1421 } 1422 return 0; 1423 } 1424 1425 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb) 1426 { 1427 if (xp->security) { 1428 return copy_sec_ctx(xp->security, skb); 1429 } 1430 return 0; 1431 } 1432 static inline size_t userpolicy_type_attrsize(void) 1433 { 1434 #ifdef CONFIG_XFRM_SUB_POLICY 1435 return nla_total_size(sizeof(struct xfrm_userpolicy_type)); 1436 #else 1437 return 0; 1438 #endif 1439 } 1440 1441 #ifdef CONFIG_XFRM_SUB_POLICY 1442 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1443 { 1444 struct xfrm_userpolicy_type upt = { 1445 .type = type, 1446 }; 1447 1448 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt); 1449 } 1450 1451 #else 1452 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1453 { 1454 return 0; 1455 } 1456 #endif 1457 1458 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr) 1459 { 1460 struct xfrm_dump_info *sp = ptr; 1461 struct xfrm_userpolicy_info *p; 1462 struct sk_buff *in_skb = sp->in_skb; 1463 struct sk_buff *skb = sp->out_skb; 1464 struct nlmsghdr *nlh; 1465 1466 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq, 1467 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags); 1468 if (nlh == NULL) 1469 return -EMSGSIZE; 1470 1471 p = nlmsg_data(nlh); 1472 copy_to_user_policy(xp, p, dir); 1473 if (copy_to_user_tmpl(xp, skb) < 0) 1474 goto nlmsg_failure; 1475 if (copy_to_user_sec_ctx(xp, skb)) 1476 goto nlmsg_failure; 1477 if (copy_to_user_policy_type(xp->type, skb) < 0) 1478 goto nlmsg_failure; 1479 if (xfrm_mark_put(skb, &xp->mark)) 1480 goto nla_put_failure; 1481 1482 nlmsg_end(skb, nlh); 1483 return 0; 1484 1485 nla_put_failure: 1486 nlmsg_failure: 1487 nlmsg_cancel(skb, nlh); 1488 return -EMSGSIZE; 1489 } 1490 1491 static int xfrm_dump_policy_done(struct netlink_callback *cb) 1492 { 1493 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1]; 1494 1495 xfrm_policy_walk_done(walk); 1496 return 0; 1497 } 1498 1499 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb) 1500 { 1501 struct net *net = sock_net(skb->sk); 1502 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1]; 1503 struct xfrm_dump_info info; 1504 1505 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) > 1506 sizeof(cb->args) - sizeof(cb->args[0])); 1507 1508 info.in_skb = cb->skb; 1509 info.out_skb = skb; 1510 info.nlmsg_seq = cb->nlh->nlmsg_seq; 1511 info.nlmsg_flags = NLM_F_MULTI; 1512 1513 if (!cb->args[0]) { 1514 cb->args[0] = 1; 1515 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY); 1516 } 1517 1518 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info); 1519 1520 return skb->len; 1521 } 1522 1523 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb, 1524 struct xfrm_policy *xp, 1525 int dir, u32 seq) 1526 { 1527 struct xfrm_dump_info info; 1528 struct sk_buff *skb; 1529 1530 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1531 if (!skb) 1532 return ERR_PTR(-ENOMEM); 1533 1534 info.in_skb = in_skb; 1535 info.out_skb = skb; 1536 info.nlmsg_seq = seq; 1537 info.nlmsg_flags = 0; 1538 1539 if (dump_one_policy(xp, dir, 0, &info) < 0) { 1540 kfree_skb(skb); 1541 return NULL; 1542 } 1543 1544 return skb; 1545 } 1546 1547 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1548 struct nlattr **attrs) 1549 { 1550 struct net *net = sock_net(skb->sk); 1551 struct xfrm_policy *xp; 1552 struct xfrm_userpolicy_id *p; 1553 u8 type = XFRM_POLICY_TYPE_MAIN; 1554 int err; 1555 struct km_event c; 1556 int delete; 1557 struct xfrm_mark m; 1558 u32 mark = xfrm_mark_get(attrs, &m); 1559 1560 p = nlmsg_data(nlh); 1561 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY; 1562 1563 err = copy_from_user_policy_type(&type, attrs); 1564 if (err) 1565 return err; 1566 1567 err = verify_policy_dir(p->dir); 1568 if (err) 1569 return err; 1570 1571 if (p->index) 1572 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err); 1573 else { 1574 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1575 struct xfrm_sec_ctx *ctx; 1576 1577 err = verify_sec_ctx_len(attrs); 1578 if (err) 1579 return err; 1580 1581 ctx = NULL; 1582 if (rt) { 1583 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 1584 1585 err = security_xfrm_policy_alloc(&ctx, uctx); 1586 if (err) 1587 return err; 1588 } 1589 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel, 1590 ctx, delete, &err); 1591 security_xfrm_policy_free(ctx); 1592 } 1593 if (xp == NULL) 1594 return -ENOENT; 1595 1596 if (!delete) { 1597 struct sk_buff *resp_skb; 1598 1599 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq); 1600 if (IS_ERR(resp_skb)) { 1601 err = PTR_ERR(resp_skb); 1602 } else { 1603 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, 1604 NETLINK_CB(skb).pid); 1605 } 1606 } else { 1607 uid_t loginuid = audit_get_loginuid(current); 1608 u32 sessionid = audit_get_sessionid(current); 1609 u32 sid; 1610 1611 security_task_getsecid(current, &sid); 1612 xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid, 1613 sid); 1614 1615 if (err != 0) 1616 goto out; 1617 1618 c.data.byid = p->index; 1619 c.event = nlh->nlmsg_type; 1620 c.seq = nlh->nlmsg_seq; 1621 c.pid = nlh->nlmsg_pid; 1622 km_policy_notify(xp, p->dir, &c); 1623 } 1624 1625 out: 1626 xfrm_pol_put(xp); 1627 return err; 1628 } 1629 1630 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 1631 struct nlattr **attrs) 1632 { 1633 struct net *net = sock_net(skb->sk); 1634 struct km_event c; 1635 struct xfrm_usersa_flush *p = nlmsg_data(nlh); 1636 struct xfrm_audit audit_info; 1637 int err; 1638 1639 audit_info.loginuid = audit_get_loginuid(current); 1640 audit_info.sessionid = audit_get_sessionid(current); 1641 security_task_getsecid(current, &audit_info.secid); 1642 err = xfrm_state_flush(net, p->proto, &audit_info); 1643 if (err) { 1644 if (err == -ESRCH) /* empty table */ 1645 return 0; 1646 return err; 1647 } 1648 c.data.proto = p->proto; 1649 c.event = nlh->nlmsg_type; 1650 c.seq = nlh->nlmsg_seq; 1651 c.pid = nlh->nlmsg_pid; 1652 c.net = net; 1653 km_state_notify(NULL, &c); 1654 1655 return 0; 1656 } 1657 1658 static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x) 1659 { 1660 size_t replay_size = x->replay_esn ? 1661 xfrm_replay_state_esn_len(x->replay_esn) : 1662 sizeof(struct xfrm_replay_state); 1663 1664 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id)) 1665 + nla_total_size(replay_size) 1666 + nla_total_size(sizeof(struct xfrm_lifetime_cur)) 1667 + nla_total_size(sizeof(struct xfrm_mark)) 1668 + nla_total_size(4) /* XFRM_AE_RTHR */ 1669 + nla_total_size(4); /* XFRM_AE_ETHR */ 1670 } 1671 1672 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 1673 { 1674 struct xfrm_aevent_id *id; 1675 struct nlmsghdr *nlh; 1676 1677 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0); 1678 if (nlh == NULL) 1679 return -EMSGSIZE; 1680 1681 id = nlmsg_data(nlh); 1682 memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr)); 1683 id->sa_id.spi = x->id.spi; 1684 id->sa_id.family = x->props.family; 1685 id->sa_id.proto = x->id.proto; 1686 memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr)); 1687 id->reqid = x->props.reqid; 1688 id->flags = c->data.aevent; 1689 1690 if (x->replay_esn) 1691 NLA_PUT(skb, XFRMA_REPLAY_ESN_VAL, 1692 xfrm_replay_state_esn_len(x->replay_esn), 1693 x->replay_esn); 1694 else 1695 NLA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay); 1696 1697 NLA_PUT(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft); 1698 1699 if (id->flags & XFRM_AE_RTHR) 1700 NLA_PUT_U32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff); 1701 1702 if (id->flags & XFRM_AE_ETHR) 1703 NLA_PUT_U32(skb, XFRMA_ETIMER_THRESH, 1704 x->replay_maxage * 10 / HZ); 1705 1706 if (xfrm_mark_put(skb, &x->mark)) 1707 goto nla_put_failure; 1708 1709 return nlmsg_end(skb, nlh); 1710 1711 nla_put_failure: 1712 nlmsg_cancel(skb, nlh); 1713 return -EMSGSIZE; 1714 } 1715 1716 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 1717 struct nlattr **attrs) 1718 { 1719 struct net *net = sock_net(skb->sk); 1720 struct xfrm_state *x; 1721 struct sk_buff *r_skb; 1722 int err; 1723 struct km_event c; 1724 u32 mark; 1725 struct xfrm_mark m; 1726 struct xfrm_aevent_id *p = nlmsg_data(nlh); 1727 struct xfrm_usersa_id *id = &p->sa_id; 1728 1729 mark = xfrm_mark_get(attrs, &m); 1730 1731 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family); 1732 if (x == NULL) 1733 return -ESRCH; 1734 1735 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 1736 if (r_skb == NULL) { 1737 xfrm_state_put(x); 1738 return -ENOMEM; 1739 } 1740 1741 /* 1742 * XXX: is this lock really needed - none of the other 1743 * gets lock (the concern is things getting updated 1744 * while we are still reading) - jhs 1745 */ 1746 spin_lock_bh(&x->lock); 1747 c.data.aevent = p->flags; 1748 c.seq = nlh->nlmsg_seq; 1749 c.pid = nlh->nlmsg_pid; 1750 1751 if (build_aevent(r_skb, x, &c) < 0) 1752 BUG(); 1753 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).pid); 1754 spin_unlock_bh(&x->lock); 1755 xfrm_state_put(x); 1756 return err; 1757 } 1758 1759 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 1760 struct nlattr **attrs) 1761 { 1762 struct net *net = sock_net(skb->sk); 1763 struct xfrm_state *x; 1764 struct km_event c; 1765 int err = - EINVAL; 1766 u32 mark = 0; 1767 struct xfrm_mark m; 1768 struct xfrm_aevent_id *p = nlmsg_data(nlh); 1769 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 1770 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL]; 1771 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 1772 1773 if (!lt && !rp && !re) 1774 return err; 1775 1776 /* pedantic mode - thou shalt sayeth replaceth */ 1777 if (!(nlh->nlmsg_flags&NLM_F_REPLACE)) 1778 return err; 1779 1780 mark = xfrm_mark_get(attrs, &m); 1781 1782 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family); 1783 if (x == NULL) 1784 return -ESRCH; 1785 1786 if (x->km.state != XFRM_STATE_VALID) 1787 goto out; 1788 1789 err = xfrm_replay_verify_len(x->replay_esn, rp); 1790 if (err) 1791 goto out; 1792 1793 spin_lock_bh(&x->lock); 1794 xfrm_update_ae_params(x, attrs); 1795 spin_unlock_bh(&x->lock); 1796 1797 c.event = nlh->nlmsg_type; 1798 c.seq = nlh->nlmsg_seq; 1799 c.pid = nlh->nlmsg_pid; 1800 c.data.aevent = XFRM_AE_CU; 1801 km_state_notify(x, &c); 1802 err = 0; 1803 out: 1804 xfrm_state_put(x); 1805 return err; 1806 } 1807 1808 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1809 struct nlattr **attrs) 1810 { 1811 struct net *net = sock_net(skb->sk); 1812 struct km_event c; 1813 u8 type = XFRM_POLICY_TYPE_MAIN; 1814 int err; 1815 struct xfrm_audit audit_info; 1816 1817 err = copy_from_user_policy_type(&type, attrs); 1818 if (err) 1819 return err; 1820 1821 audit_info.loginuid = audit_get_loginuid(current); 1822 audit_info.sessionid = audit_get_sessionid(current); 1823 security_task_getsecid(current, &audit_info.secid); 1824 err = xfrm_policy_flush(net, type, &audit_info); 1825 if (err) { 1826 if (err == -ESRCH) /* empty table */ 1827 return 0; 1828 return err; 1829 } 1830 1831 c.data.type = type; 1832 c.event = nlh->nlmsg_type; 1833 c.seq = nlh->nlmsg_seq; 1834 c.pid = nlh->nlmsg_pid; 1835 c.net = net; 1836 km_policy_notify(NULL, 0, &c); 1837 return 0; 1838 } 1839 1840 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 1841 struct nlattr **attrs) 1842 { 1843 struct net *net = sock_net(skb->sk); 1844 struct xfrm_policy *xp; 1845 struct xfrm_user_polexpire *up = nlmsg_data(nlh); 1846 struct xfrm_userpolicy_info *p = &up->pol; 1847 u8 type = XFRM_POLICY_TYPE_MAIN; 1848 int err = -ENOENT; 1849 struct xfrm_mark m; 1850 u32 mark = xfrm_mark_get(attrs, &m); 1851 1852 err = copy_from_user_policy_type(&type, attrs); 1853 if (err) 1854 return err; 1855 1856 err = verify_policy_dir(p->dir); 1857 if (err) 1858 return err; 1859 1860 if (p->index) 1861 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err); 1862 else { 1863 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1864 struct xfrm_sec_ctx *ctx; 1865 1866 err = verify_sec_ctx_len(attrs); 1867 if (err) 1868 return err; 1869 1870 ctx = NULL; 1871 if (rt) { 1872 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 1873 1874 err = security_xfrm_policy_alloc(&ctx, uctx); 1875 if (err) 1876 return err; 1877 } 1878 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, 1879 &p->sel, ctx, 0, &err); 1880 security_xfrm_policy_free(ctx); 1881 } 1882 if (xp == NULL) 1883 return -ENOENT; 1884 1885 if (unlikely(xp->walk.dead)) 1886 goto out; 1887 1888 err = 0; 1889 if (up->hard) { 1890 uid_t loginuid = audit_get_loginuid(current); 1891 u32 sessionid = audit_get_sessionid(current); 1892 u32 sid; 1893 1894 security_task_getsecid(current, &sid); 1895 xfrm_policy_delete(xp, p->dir); 1896 xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid); 1897 1898 } else { 1899 // reset the timers here? 1900 WARN(1, "Dont know what to do with soft policy expire\n"); 1901 } 1902 km_policy_expired(xp, p->dir, up->hard, current->pid); 1903 1904 out: 1905 xfrm_pol_put(xp); 1906 return err; 1907 } 1908 1909 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 1910 struct nlattr **attrs) 1911 { 1912 struct net *net = sock_net(skb->sk); 1913 struct xfrm_state *x; 1914 int err; 1915 struct xfrm_user_expire *ue = nlmsg_data(nlh); 1916 struct xfrm_usersa_info *p = &ue->state; 1917 struct xfrm_mark m; 1918 u32 mark = xfrm_mark_get(attrs, &m); 1919 1920 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family); 1921 1922 err = -ENOENT; 1923 if (x == NULL) 1924 return err; 1925 1926 spin_lock_bh(&x->lock); 1927 err = -EINVAL; 1928 if (x->km.state != XFRM_STATE_VALID) 1929 goto out; 1930 km_state_expired(x, ue->hard, current->pid); 1931 1932 if (ue->hard) { 1933 uid_t loginuid = audit_get_loginuid(current); 1934 u32 sessionid = audit_get_sessionid(current); 1935 u32 sid; 1936 1937 security_task_getsecid(current, &sid); 1938 __xfrm_state_delete(x); 1939 xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid); 1940 } 1941 err = 0; 1942 out: 1943 spin_unlock_bh(&x->lock); 1944 xfrm_state_put(x); 1945 return err; 1946 } 1947 1948 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, 1949 struct nlattr **attrs) 1950 { 1951 struct net *net = sock_net(skb->sk); 1952 struct xfrm_policy *xp; 1953 struct xfrm_user_tmpl *ut; 1954 int i; 1955 struct nlattr *rt = attrs[XFRMA_TMPL]; 1956 struct xfrm_mark mark; 1957 1958 struct xfrm_user_acquire *ua = nlmsg_data(nlh); 1959 struct xfrm_state *x = xfrm_state_alloc(net); 1960 int err = -ENOMEM; 1961 1962 if (!x) 1963 goto nomem; 1964 1965 xfrm_mark_get(attrs, &mark); 1966 1967 err = verify_newpolicy_info(&ua->policy); 1968 if (err) 1969 goto bad_policy; 1970 1971 /* build an XP */ 1972 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err); 1973 if (!xp) 1974 goto free_state; 1975 1976 memcpy(&x->id, &ua->id, sizeof(ua->id)); 1977 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr)); 1978 memcpy(&x->sel, &ua->sel, sizeof(ua->sel)); 1979 xp->mark.m = x->mark.m = mark.m; 1980 xp->mark.v = x->mark.v = mark.v; 1981 ut = nla_data(rt); 1982 /* extract the templates and for each call km_key */ 1983 for (i = 0; i < xp->xfrm_nr; i++, ut++) { 1984 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 1985 memcpy(&x->id, &t->id, sizeof(x->id)); 1986 x->props.mode = t->mode; 1987 x->props.reqid = t->reqid; 1988 x->props.family = ut->family; 1989 t->aalgos = ua->aalgos; 1990 t->ealgos = ua->ealgos; 1991 t->calgos = ua->calgos; 1992 err = km_query(x, t, xp); 1993 1994 } 1995 1996 kfree(x); 1997 kfree(xp); 1998 1999 return 0; 2000 2001 bad_policy: 2002 WARN(1, "BAD policy passed\n"); 2003 free_state: 2004 kfree(x); 2005 nomem: 2006 return err; 2007 } 2008 2009 #ifdef CONFIG_XFRM_MIGRATE 2010 static int copy_from_user_migrate(struct xfrm_migrate *ma, 2011 struct xfrm_kmaddress *k, 2012 struct nlattr **attrs, int *num) 2013 { 2014 struct nlattr *rt = attrs[XFRMA_MIGRATE]; 2015 struct xfrm_user_migrate *um; 2016 int i, num_migrate; 2017 2018 if (k != NULL) { 2019 struct xfrm_user_kmaddress *uk; 2020 2021 uk = nla_data(attrs[XFRMA_KMADDRESS]); 2022 memcpy(&k->local, &uk->local, sizeof(k->local)); 2023 memcpy(&k->remote, &uk->remote, sizeof(k->remote)); 2024 k->family = uk->family; 2025 k->reserved = uk->reserved; 2026 } 2027 2028 um = nla_data(rt); 2029 num_migrate = nla_len(rt) / sizeof(*um); 2030 2031 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH) 2032 return -EINVAL; 2033 2034 for (i = 0; i < num_migrate; i++, um++, ma++) { 2035 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr)); 2036 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr)); 2037 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr)); 2038 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr)); 2039 2040 ma->proto = um->proto; 2041 ma->mode = um->mode; 2042 ma->reqid = um->reqid; 2043 2044 ma->old_family = um->old_family; 2045 ma->new_family = um->new_family; 2046 } 2047 2048 *num = i; 2049 return 0; 2050 } 2051 2052 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 2053 struct nlattr **attrs) 2054 { 2055 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh); 2056 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 2057 struct xfrm_kmaddress km, *kmp; 2058 u8 type; 2059 int err; 2060 int n = 0; 2061 2062 if (attrs[XFRMA_MIGRATE] == NULL) 2063 return -EINVAL; 2064 2065 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL; 2066 2067 err = copy_from_user_policy_type(&type, attrs); 2068 if (err) 2069 return err; 2070 2071 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n); 2072 if (err) 2073 return err; 2074 2075 if (!n) 2076 return 0; 2077 2078 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp); 2079 2080 return 0; 2081 } 2082 #else 2083 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 2084 struct nlattr **attrs) 2085 { 2086 return -ENOPROTOOPT; 2087 } 2088 #endif 2089 2090 #ifdef CONFIG_XFRM_MIGRATE 2091 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb) 2092 { 2093 struct xfrm_user_migrate um; 2094 2095 memset(&um, 0, sizeof(um)); 2096 um.proto = m->proto; 2097 um.mode = m->mode; 2098 um.reqid = m->reqid; 2099 um.old_family = m->old_family; 2100 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr)); 2101 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr)); 2102 um.new_family = m->new_family; 2103 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr)); 2104 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr)); 2105 2106 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um); 2107 } 2108 2109 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb) 2110 { 2111 struct xfrm_user_kmaddress uk; 2112 2113 memset(&uk, 0, sizeof(uk)); 2114 uk.family = k->family; 2115 uk.reserved = k->reserved; 2116 memcpy(&uk.local, &k->local, sizeof(uk.local)); 2117 memcpy(&uk.remote, &k->remote, sizeof(uk.remote)); 2118 2119 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk); 2120 } 2121 2122 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma) 2123 { 2124 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id)) 2125 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0) 2126 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate) 2127 + userpolicy_type_attrsize(); 2128 } 2129 2130 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m, 2131 int num_migrate, const struct xfrm_kmaddress *k, 2132 const struct xfrm_selector *sel, u8 dir, u8 type) 2133 { 2134 const struct xfrm_migrate *mp; 2135 struct xfrm_userpolicy_id *pol_id; 2136 struct nlmsghdr *nlh; 2137 int i; 2138 2139 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0); 2140 if (nlh == NULL) 2141 return -EMSGSIZE; 2142 2143 pol_id = nlmsg_data(nlh); 2144 /* copy data from selector, dir, and type to the pol_id */ 2145 memset(pol_id, 0, sizeof(*pol_id)); 2146 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel)); 2147 pol_id->dir = dir; 2148 2149 if (k != NULL && (copy_to_user_kmaddress(k, skb) < 0)) 2150 goto nlmsg_failure; 2151 2152 if (copy_to_user_policy_type(type, skb) < 0) 2153 goto nlmsg_failure; 2154 2155 for (i = 0, mp = m ; i < num_migrate; i++, mp++) { 2156 if (copy_to_user_migrate(mp, skb) < 0) 2157 goto nlmsg_failure; 2158 } 2159 2160 return nlmsg_end(skb, nlh); 2161 nlmsg_failure: 2162 nlmsg_cancel(skb, nlh); 2163 return -EMSGSIZE; 2164 } 2165 2166 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2167 const struct xfrm_migrate *m, int num_migrate, 2168 const struct xfrm_kmaddress *k) 2169 { 2170 struct net *net = &init_net; 2171 struct sk_buff *skb; 2172 2173 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC); 2174 if (skb == NULL) 2175 return -ENOMEM; 2176 2177 /* build migrate */ 2178 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0) 2179 BUG(); 2180 2181 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC); 2182 } 2183 #else 2184 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2185 const struct xfrm_migrate *m, int num_migrate, 2186 const struct xfrm_kmaddress *k) 2187 { 2188 return -ENOPROTOOPT; 2189 } 2190 #endif 2191 2192 #define XMSGSIZE(type) sizeof(struct type) 2193 2194 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = { 2195 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2196 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2197 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2198 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2199 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2200 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2201 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info), 2202 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire), 2203 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire), 2204 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2205 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2206 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire), 2207 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush), 2208 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0, 2209 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2210 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2211 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report), 2212 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2213 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32), 2214 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 2215 }; 2216 2217 #undef XMSGSIZE 2218 2219 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = { 2220 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)}, 2221 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)}, 2222 [XFRMA_LASTUSED] = { .type = NLA_U64}, 2223 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)}, 2224 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) }, 2225 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) }, 2226 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) }, 2227 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) }, 2228 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) }, 2229 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) }, 2230 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) }, 2231 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) }, 2232 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) }, 2233 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 }, 2234 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 }, 2235 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) }, 2236 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) }, 2237 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)}, 2238 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) }, 2239 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) }, 2240 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) }, 2241 [XFRMA_TFCPAD] = { .type = NLA_U32 }, 2242 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) }, 2243 }; 2244 2245 static struct xfrm_link { 2246 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **); 2247 int (*dump)(struct sk_buff *, struct netlink_callback *); 2248 int (*done)(struct netlink_callback *); 2249 } xfrm_dispatch[XFRM_NR_MSGTYPES] = { 2250 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 2251 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa }, 2252 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa, 2253 .dump = xfrm_dump_sa, 2254 .done = xfrm_dump_sa_done }, 2255 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 2256 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy }, 2257 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy, 2258 .dump = xfrm_dump_policy, 2259 .done = xfrm_dump_policy_done }, 2260 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi }, 2261 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire }, 2262 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire }, 2263 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 2264 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 2265 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire}, 2266 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa }, 2267 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy }, 2268 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae }, 2269 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae }, 2270 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate }, 2271 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo }, 2272 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo }, 2273 }; 2274 2275 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 2276 { 2277 struct net *net = sock_net(skb->sk); 2278 struct nlattr *attrs[XFRMA_MAX+1]; 2279 struct xfrm_link *link; 2280 int type, err; 2281 2282 type = nlh->nlmsg_type; 2283 if (type > XFRM_MSG_MAX) 2284 return -EINVAL; 2285 2286 type -= XFRM_MSG_BASE; 2287 link = &xfrm_dispatch[type]; 2288 2289 /* All operations require privileges, even GET */ 2290 if (security_netlink_recv(skb, CAP_NET_ADMIN)) 2291 return -EPERM; 2292 2293 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) || 2294 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) && 2295 (nlh->nlmsg_flags & NLM_F_DUMP)) { 2296 if (link->dump == NULL) 2297 return -EINVAL; 2298 2299 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, link->dump, link->done); 2300 } 2301 2302 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX, 2303 xfrma_policy); 2304 if (err < 0) 2305 return err; 2306 2307 if (link->doit == NULL) 2308 return -EINVAL; 2309 2310 return link->doit(skb, nlh, attrs); 2311 } 2312 2313 static void xfrm_netlink_rcv(struct sk_buff *skb) 2314 { 2315 mutex_lock(&xfrm_cfg_mutex); 2316 netlink_rcv_skb(skb, &xfrm_user_rcv_msg); 2317 mutex_unlock(&xfrm_cfg_mutex); 2318 } 2319 2320 static inline size_t xfrm_expire_msgsize(void) 2321 { 2322 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire)) 2323 + nla_total_size(sizeof(struct xfrm_mark)); 2324 } 2325 2326 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 2327 { 2328 struct xfrm_user_expire *ue; 2329 struct nlmsghdr *nlh; 2330 2331 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0); 2332 if (nlh == NULL) 2333 return -EMSGSIZE; 2334 2335 ue = nlmsg_data(nlh); 2336 copy_to_user_state(x, &ue->state); 2337 ue->hard = (c->data.hard != 0) ? 1 : 0; 2338 2339 if (xfrm_mark_put(skb, &x->mark)) 2340 goto nla_put_failure; 2341 2342 return nlmsg_end(skb, nlh); 2343 2344 nla_put_failure: 2345 return -EMSGSIZE; 2346 } 2347 2348 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c) 2349 { 2350 struct net *net = xs_net(x); 2351 struct sk_buff *skb; 2352 2353 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC); 2354 if (skb == NULL) 2355 return -ENOMEM; 2356 2357 if (build_expire(skb, x, c) < 0) { 2358 kfree_skb(skb); 2359 return -EMSGSIZE; 2360 } 2361 2362 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC); 2363 } 2364 2365 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c) 2366 { 2367 struct net *net = xs_net(x); 2368 struct sk_buff *skb; 2369 2370 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 2371 if (skb == NULL) 2372 return -ENOMEM; 2373 2374 if (build_aevent(skb, x, c) < 0) 2375 BUG(); 2376 2377 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC); 2378 } 2379 2380 static int xfrm_notify_sa_flush(const struct km_event *c) 2381 { 2382 struct net *net = c->net; 2383 struct xfrm_usersa_flush *p; 2384 struct nlmsghdr *nlh; 2385 struct sk_buff *skb; 2386 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush)); 2387 2388 skb = nlmsg_new(len, GFP_ATOMIC); 2389 if (skb == NULL) 2390 return -ENOMEM; 2391 2392 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0); 2393 if (nlh == NULL) { 2394 kfree_skb(skb); 2395 return -EMSGSIZE; 2396 } 2397 2398 p = nlmsg_data(nlh); 2399 p->proto = c->data.proto; 2400 2401 nlmsg_end(skb, nlh); 2402 2403 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC); 2404 } 2405 2406 static inline size_t xfrm_sa_len(struct xfrm_state *x) 2407 { 2408 size_t l = 0; 2409 if (x->aead) 2410 l += nla_total_size(aead_len(x->aead)); 2411 if (x->aalg) { 2412 l += nla_total_size(sizeof(struct xfrm_algo) + 2413 (x->aalg->alg_key_len + 7) / 8); 2414 l += nla_total_size(xfrm_alg_auth_len(x->aalg)); 2415 } 2416 if (x->ealg) 2417 l += nla_total_size(xfrm_alg_len(x->ealg)); 2418 if (x->calg) 2419 l += nla_total_size(sizeof(*x->calg)); 2420 if (x->encap) 2421 l += nla_total_size(sizeof(*x->encap)); 2422 if (x->tfcpad) 2423 l += nla_total_size(sizeof(x->tfcpad)); 2424 if (x->replay_esn) 2425 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn)); 2426 if (x->security) 2427 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) + 2428 x->security->ctx_len); 2429 if (x->coaddr) 2430 l += nla_total_size(sizeof(*x->coaddr)); 2431 2432 /* Must count x->lastused as it may become non-zero behind our back. */ 2433 l += nla_total_size(sizeof(u64)); 2434 2435 return l; 2436 } 2437 2438 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c) 2439 { 2440 struct net *net = xs_net(x); 2441 struct xfrm_usersa_info *p; 2442 struct xfrm_usersa_id *id; 2443 struct nlmsghdr *nlh; 2444 struct sk_buff *skb; 2445 int len = xfrm_sa_len(x); 2446 int headlen; 2447 2448 headlen = sizeof(*p); 2449 if (c->event == XFRM_MSG_DELSA) { 2450 len += nla_total_size(headlen); 2451 headlen = sizeof(*id); 2452 len += nla_total_size(sizeof(struct xfrm_mark)); 2453 } 2454 len += NLMSG_ALIGN(headlen); 2455 2456 skb = nlmsg_new(len, GFP_ATOMIC); 2457 if (skb == NULL) 2458 return -ENOMEM; 2459 2460 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0); 2461 if (nlh == NULL) 2462 goto nla_put_failure; 2463 2464 p = nlmsg_data(nlh); 2465 if (c->event == XFRM_MSG_DELSA) { 2466 struct nlattr *attr; 2467 2468 id = nlmsg_data(nlh); 2469 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr)); 2470 id->spi = x->id.spi; 2471 id->family = x->props.family; 2472 id->proto = x->id.proto; 2473 2474 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p)); 2475 if (attr == NULL) 2476 goto nla_put_failure; 2477 2478 p = nla_data(attr); 2479 } 2480 2481 if (copy_to_user_state_extra(x, p, skb)) 2482 goto nla_put_failure; 2483 2484 nlmsg_end(skb, nlh); 2485 2486 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC); 2487 2488 nla_put_failure: 2489 /* Somebody screwed up with xfrm_sa_len! */ 2490 WARN_ON(1); 2491 kfree_skb(skb); 2492 return -1; 2493 } 2494 2495 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c) 2496 { 2497 2498 switch (c->event) { 2499 case XFRM_MSG_EXPIRE: 2500 return xfrm_exp_state_notify(x, c); 2501 case XFRM_MSG_NEWAE: 2502 return xfrm_aevent_state_notify(x, c); 2503 case XFRM_MSG_DELSA: 2504 case XFRM_MSG_UPDSA: 2505 case XFRM_MSG_NEWSA: 2506 return xfrm_notify_sa(x, c); 2507 case XFRM_MSG_FLUSHSA: 2508 return xfrm_notify_sa_flush(c); 2509 default: 2510 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n", 2511 c->event); 2512 break; 2513 } 2514 2515 return 0; 2516 2517 } 2518 2519 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x, 2520 struct xfrm_policy *xp) 2521 { 2522 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire)) 2523 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 2524 + nla_total_size(sizeof(struct xfrm_mark)) 2525 + nla_total_size(xfrm_user_sec_ctx_size(x->security)) 2526 + userpolicy_type_attrsize(); 2527 } 2528 2529 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x, 2530 struct xfrm_tmpl *xt, struct xfrm_policy *xp, 2531 int dir) 2532 { 2533 struct xfrm_user_acquire *ua; 2534 struct nlmsghdr *nlh; 2535 __u32 seq = xfrm_get_acqseq(); 2536 2537 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0); 2538 if (nlh == NULL) 2539 return -EMSGSIZE; 2540 2541 ua = nlmsg_data(nlh); 2542 memcpy(&ua->id, &x->id, sizeof(ua->id)); 2543 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr)); 2544 memcpy(&ua->sel, &x->sel, sizeof(ua->sel)); 2545 copy_to_user_policy(xp, &ua->policy, dir); 2546 ua->aalgos = xt->aalgos; 2547 ua->ealgos = xt->ealgos; 2548 ua->calgos = xt->calgos; 2549 ua->seq = x->km.seq = seq; 2550 2551 if (copy_to_user_tmpl(xp, skb) < 0) 2552 goto nlmsg_failure; 2553 if (copy_to_user_state_sec_ctx(x, skb)) 2554 goto nlmsg_failure; 2555 if (copy_to_user_policy_type(xp->type, skb) < 0) 2556 goto nlmsg_failure; 2557 if (xfrm_mark_put(skb, &xp->mark)) 2558 goto nla_put_failure; 2559 2560 return nlmsg_end(skb, nlh); 2561 2562 nla_put_failure: 2563 nlmsg_failure: 2564 nlmsg_cancel(skb, nlh); 2565 return -EMSGSIZE; 2566 } 2567 2568 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt, 2569 struct xfrm_policy *xp, int dir) 2570 { 2571 struct net *net = xs_net(x); 2572 struct sk_buff *skb; 2573 2574 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC); 2575 if (skb == NULL) 2576 return -ENOMEM; 2577 2578 if (build_acquire(skb, x, xt, xp, dir) < 0) 2579 BUG(); 2580 2581 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC); 2582 } 2583 2584 /* User gives us xfrm_user_policy_info followed by an array of 0 2585 * or more templates. 2586 */ 2587 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt, 2588 u8 *data, int len, int *dir) 2589 { 2590 struct net *net = sock_net(sk); 2591 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data; 2592 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1); 2593 struct xfrm_policy *xp; 2594 int nr; 2595 2596 switch (sk->sk_family) { 2597 case AF_INET: 2598 if (opt != IP_XFRM_POLICY) { 2599 *dir = -EOPNOTSUPP; 2600 return NULL; 2601 } 2602 break; 2603 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 2604 case AF_INET6: 2605 if (opt != IPV6_XFRM_POLICY) { 2606 *dir = -EOPNOTSUPP; 2607 return NULL; 2608 } 2609 break; 2610 #endif 2611 default: 2612 *dir = -EINVAL; 2613 return NULL; 2614 } 2615 2616 *dir = -EINVAL; 2617 2618 if (len < sizeof(*p) || 2619 verify_newpolicy_info(p)) 2620 return NULL; 2621 2622 nr = ((len - sizeof(*p)) / sizeof(*ut)); 2623 if (validate_tmpl(nr, ut, p->sel.family)) 2624 return NULL; 2625 2626 if (p->dir > XFRM_POLICY_OUT) 2627 return NULL; 2628 2629 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 2630 if (xp == NULL) { 2631 *dir = -ENOBUFS; 2632 return NULL; 2633 } 2634 2635 copy_from_user_policy(xp, p); 2636 xp->type = XFRM_POLICY_TYPE_MAIN; 2637 copy_templates(xp, ut, nr); 2638 2639 *dir = p->dir; 2640 2641 return xp; 2642 } 2643 2644 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp) 2645 { 2646 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire)) 2647 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 2648 + nla_total_size(xfrm_user_sec_ctx_size(xp->security)) 2649 + nla_total_size(sizeof(struct xfrm_mark)) 2650 + userpolicy_type_attrsize(); 2651 } 2652 2653 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp, 2654 int dir, const struct km_event *c) 2655 { 2656 struct xfrm_user_polexpire *upe; 2657 struct nlmsghdr *nlh; 2658 int hard = c->data.hard; 2659 2660 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0); 2661 if (nlh == NULL) 2662 return -EMSGSIZE; 2663 2664 upe = nlmsg_data(nlh); 2665 copy_to_user_policy(xp, &upe->pol, dir); 2666 if (copy_to_user_tmpl(xp, skb) < 0) 2667 goto nlmsg_failure; 2668 if (copy_to_user_sec_ctx(xp, skb)) 2669 goto nlmsg_failure; 2670 if (copy_to_user_policy_type(xp->type, skb) < 0) 2671 goto nlmsg_failure; 2672 if (xfrm_mark_put(skb, &xp->mark)) 2673 goto nla_put_failure; 2674 upe->hard = !!hard; 2675 2676 return nlmsg_end(skb, nlh); 2677 2678 nla_put_failure: 2679 nlmsg_failure: 2680 nlmsg_cancel(skb, nlh); 2681 return -EMSGSIZE; 2682 } 2683 2684 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 2685 { 2686 struct net *net = xp_net(xp); 2687 struct sk_buff *skb; 2688 2689 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC); 2690 if (skb == NULL) 2691 return -ENOMEM; 2692 2693 if (build_polexpire(skb, xp, dir, c) < 0) 2694 BUG(); 2695 2696 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC); 2697 } 2698 2699 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) 2700 { 2701 struct net *net = xp_net(xp); 2702 struct xfrm_userpolicy_info *p; 2703 struct xfrm_userpolicy_id *id; 2704 struct nlmsghdr *nlh; 2705 struct sk_buff *skb; 2706 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); 2707 int headlen; 2708 2709 headlen = sizeof(*p); 2710 if (c->event == XFRM_MSG_DELPOLICY) { 2711 len += nla_total_size(headlen); 2712 headlen = sizeof(*id); 2713 } 2714 len += userpolicy_type_attrsize(); 2715 len += nla_total_size(sizeof(struct xfrm_mark)); 2716 len += NLMSG_ALIGN(headlen); 2717 2718 skb = nlmsg_new(len, GFP_ATOMIC); 2719 if (skb == NULL) 2720 return -ENOMEM; 2721 2722 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0); 2723 if (nlh == NULL) 2724 goto nlmsg_failure; 2725 2726 p = nlmsg_data(nlh); 2727 if (c->event == XFRM_MSG_DELPOLICY) { 2728 struct nlattr *attr; 2729 2730 id = nlmsg_data(nlh); 2731 memset(id, 0, sizeof(*id)); 2732 id->dir = dir; 2733 if (c->data.byid) 2734 id->index = xp->index; 2735 else 2736 memcpy(&id->sel, &xp->selector, sizeof(id->sel)); 2737 2738 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p)); 2739 if (attr == NULL) 2740 goto nlmsg_failure; 2741 2742 p = nla_data(attr); 2743 } 2744 2745 copy_to_user_policy(xp, p, dir); 2746 if (copy_to_user_tmpl(xp, skb) < 0) 2747 goto nlmsg_failure; 2748 if (copy_to_user_policy_type(xp->type, skb) < 0) 2749 goto nlmsg_failure; 2750 2751 if (xfrm_mark_put(skb, &xp->mark)) 2752 goto nla_put_failure; 2753 2754 nlmsg_end(skb, nlh); 2755 2756 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC); 2757 2758 nla_put_failure: 2759 nlmsg_failure: 2760 kfree_skb(skb); 2761 return -1; 2762 } 2763 2764 static int xfrm_notify_policy_flush(const struct km_event *c) 2765 { 2766 struct net *net = c->net; 2767 struct nlmsghdr *nlh; 2768 struct sk_buff *skb; 2769 2770 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC); 2771 if (skb == NULL) 2772 return -ENOMEM; 2773 2774 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0); 2775 if (nlh == NULL) 2776 goto nlmsg_failure; 2777 if (copy_to_user_policy_type(c->data.type, skb) < 0) 2778 goto nlmsg_failure; 2779 2780 nlmsg_end(skb, nlh); 2781 2782 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC); 2783 2784 nlmsg_failure: 2785 kfree_skb(skb); 2786 return -1; 2787 } 2788 2789 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 2790 { 2791 2792 switch (c->event) { 2793 case XFRM_MSG_NEWPOLICY: 2794 case XFRM_MSG_UPDPOLICY: 2795 case XFRM_MSG_DELPOLICY: 2796 return xfrm_notify_policy(xp, dir, c); 2797 case XFRM_MSG_FLUSHPOLICY: 2798 return xfrm_notify_policy_flush(c); 2799 case XFRM_MSG_POLEXPIRE: 2800 return xfrm_exp_policy_notify(xp, dir, c); 2801 default: 2802 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n", 2803 c->event); 2804 } 2805 2806 return 0; 2807 2808 } 2809 2810 static inline size_t xfrm_report_msgsize(void) 2811 { 2812 return NLMSG_ALIGN(sizeof(struct xfrm_user_report)); 2813 } 2814 2815 static int build_report(struct sk_buff *skb, u8 proto, 2816 struct xfrm_selector *sel, xfrm_address_t *addr) 2817 { 2818 struct xfrm_user_report *ur; 2819 struct nlmsghdr *nlh; 2820 2821 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0); 2822 if (nlh == NULL) 2823 return -EMSGSIZE; 2824 2825 ur = nlmsg_data(nlh); 2826 ur->proto = proto; 2827 memcpy(&ur->sel, sel, sizeof(ur->sel)); 2828 2829 if (addr) 2830 NLA_PUT(skb, XFRMA_COADDR, sizeof(*addr), addr); 2831 2832 return nlmsg_end(skb, nlh); 2833 2834 nla_put_failure: 2835 nlmsg_cancel(skb, nlh); 2836 return -EMSGSIZE; 2837 } 2838 2839 static int xfrm_send_report(struct net *net, u8 proto, 2840 struct xfrm_selector *sel, xfrm_address_t *addr) 2841 { 2842 struct sk_buff *skb; 2843 2844 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC); 2845 if (skb == NULL) 2846 return -ENOMEM; 2847 2848 if (build_report(skb, proto, sel, addr) < 0) 2849 BUG(); 2850 2851 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC); 2852 } 2853 2854 static inline size_t xfrm_mapping_msgsize(void) 2855 { 2856 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping)); 2857 } 2858 2859 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x, 2860 xfrm_address_t *new_saddr, __be16 new_sport) 2861 { 2862 struct xfrm_user_mapping *um; 2863 struct nlmsghdr *nlh; 2864 2865 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0); 2866 if (nlh == NULL) 2867 return -EMSGSIZE; 2868 2869 um = nlmsg_data(nlh); 2870 2871 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr)); 2872 um->id.spi = x->id.spi; 2873 um->id.family = x->props.family; 2874 um->id.proto = x->id.proto; 2875 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr)); 2876 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr)); 2877 um->new_sport = new_sport; 2878 um->old_sport = x->encap->encap_sport; 2879 um->reqid = x->props.reqid; 2880 2881 return nlmsg_end(skb, nlh); 2882 } 2883 2884 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, 2885 __be16 sport) 2886 { 2887 struct net *net = xs_net(x); 2888 struct sk_buff *skb; 2889 2890 if (x->id.proto != IPPROTO_ESP) 2891 return -EINVAL; 2892 2893 if (!x->encap) 2894 return -EINVAL; 2895 2896 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC); 2897 if (skb == NULL) 2898 return -ENOMEM; 2899 2900 if (build_mapping(skb, x, ipaddr, sport) < 0) 2901 BUG(); 2902 2903 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MAPPING, GFP_ATOMIC); 2904 } 2905 2906 static struct xfrm_mgr netlink_mgr = { 2907 .id = "netlink", 2908 .notify = xfrm_send_state_notify, 2909 .acquire = xfrm_send_acquire, 2910 .compile_policy = xfrm_compile_policy, 2911 .notify_policy = xfrm_send_policy_notify, 2912 .report = xfrm_send_report, 2913 .migrate = xfrm_send_migrate, 2914 .new_mapping = xfrm_send_mapping, 2915 }; 2916 2917 static int __net_init xfrm_user_net_init(struct net *net) 2918 { 2919 struct sock *nlsk; 2920 2921 nlsk = netlink_kernel_create(net, NETLINK_XFRM, XFRMNLGRP_MAX, 2922 xfrm_netlink_rcv, NULL, THIS_MODULE); 2923 if (nlsk == NULL) 2924 return -ENOMEM; 2925 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */ 2926 rcu_assign_pointer(net->xfrm.nlsk, nlsk); 2927 return 0; 2928 } 2929 2930 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list) 2931 { 2932 struct net *net; 2933 list_for_each_entry(net, net_exit_list, exit_list) 2934 rcu_assign_pointer(net->xfrm.nlsk, NULL); 2935 synchronize_net(); 2936 list_for_each_entry(net, net_exit_list, exit_list) 2937 netlink_kernel_release(net->xfrm.nlsk_stash); 2938 } 2939 2940 static struct pernet_operations xfrm_user_net_ops = { 2941 .init = xfrm_user_net_init, 2942 .exit_batch = xfrm_user_net_exit, 2943 }; 2944 2945 static int __init xfrm_user_init(void) 2946 { 2947 int rv; 2948 2949 printk(KERN_INFO "Initializing XFRM netlink socket\n"); 2950 2951 rv = register_pernet_subsys(&xfrm_user_net_ops); 2952 if (rv < 0) 2953 return rv; 2954 rv = xfrm_register_km(&netlink_mgr); 2955 if (rv < 0) 2956 unregister_pernet_subsys(&xfrm_user_net_ops); 2957 return rv; 2958 } 2959 2960 static void __exit xfrm_user_exit(void) 2961 { 2962 xfrm_unregister_km(&netlink_mgr); 2963 unregister_pernet_subsys(&xfrm_user_net_ops); 2964 } 2965 2966 module_init(xfrm_user_init); 2967 module_exit(xfrm_user_exit); 2968 MODULE_LICENSE("GPL"); 2969 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM); 2970 2971