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