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 struct xfrm_replay_state_esn *rs; 127 128 if (p->flags & XFRM_STATE_ESN) { 129 if (!rt) 130 return -EINVAL; 131 132 rs = nla_data(rt); 133 134 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8) 135 return -EINVAL; 136 137 if (nla_len(rt) < xfrm_replay_state_esn_len(rs) && 138 nla_len(rt) != sizeof(*rs)) 139 return -EINVAL; 140 } 141 142 if (!rt) 143 return 0; 144 145 if (p->id.proto != IPPROTO_ESP) 146 return -EINVAL; 147 148 if (p->replay_window != 0) 149 return -EINVAL; 150 151 return 0; 152 } 153 154 static int verify_newsa_info(struct xfrm_usersa_info *p, 155 struct nlattr **attrs) 156 { 157 int err; 158 159 err = -EINVAL; 160 switch (p->family) { 161 case AF_INET: 162 break; 163 164 case AF_INET6: 165 #if IS_ENABLED(CONFIG_IPV6) 166 break; 167 #else 168 err = -EAFNOSUPPORT; 169 goto out; 170 #endif 171 172 default: 173 goto out; 174 } 175 176 err = -EINVAL; 177 switch (p->id.proto) { 178 case IPPROTO_AH: 179 if ((!attrs[XFRMA_ALG_AUTH] && 180 !attrs[XFRMA_ALG_AUTH_TRUNC]) || 181 attrs[XFRMA_ALG_AEAD] || 182 attrs[XFRMA_ALG_CRYPT] || 183 attrs[XFRMA_ALG_COMP] || 184 attrs[XFRMA_TFCPAD]) 185 goto out; 186 break; 187 188 case IPPROTO_ESP: 189 if (attrs[XFRMA_ALG_COMP]) 190 goto out; 191 if (!attrs[XFRMA_ALG_AUTH] && 192 !attrs[XFRMA_ALG_AUTH_TRUNC] && 193 !attrs[XFRMA_ALG_CRYPT] && 194 !attrs[XFRMA_ALG_AEAD]) 195 goto out; 196 if ((attrs[XFRMA_ALG_AUTH] || 197 attrs[XFRMA_ALG_AUTH_TRUNC] || 198 attrs[XFRMA_ALG_CRYPT]) && 199 attrs[XFRMA_ALG_AEAD]) 200 goto out; 201 if (attrs[XFRMA_TFCPAD] && 202 p->mode != XFRM_MODE_TUNNEL) 203 goto out; 204 break; 205 206 case IPPROTO_COMP: 207 if (!attrs[XFRMA_ALG_COMP] || 208 attrs[XFRMA_ALG_AEAD] || 209 attrs[XFRMA_ALG_AUTH] || 210 attrs[XFRMA_ALG_AUTH_TRUNC] || 211 attrs[XFRMA_ALG_CRYPT] || 212 attrs[XFRMA_TFCPAD]) 213 goto out; 214 break; 215 216 #if IS_ENABLED(CONFIG_IPV6) 217 case IPPROTO_DSTOPTS: 218 case IPPROTO_ROUTING: 219 if (attrs[XFRMA_ALG_COMP] || 220 attrs[XFRMA_ALG_AUTH] || 221 attrs[XFRMA_ALG_AUTH_TRUNC] || 222 attrs[XFRMA_ALG_AEAD] || 223 attrs[XFRMA_ALG_CRYPT] || 224 attrs[XFRMA_ENCAP] || 225 attrs[XFRMA_SEC_CTX] || 226 attrs[XFRMA_TFCPAD] || 227 !attrs[XFRMA_COADDR]) 228 goto out; 229 break; 230 #endif 231 232 default: 233 goto out; 234 } 235 236 if ((err = verify_aead(attrs))) 237 goto out; 238 if ((err = verify_auth_trunc(attrs))) 239 goto out; 240 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH))) 241 goto out; 242 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT))) 243 goto out; 244 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP))) 245 goto out; 246 if ((err = verify_sec_ctx_len(attrs))) 247 goto out; 248 if ((err = verify_replay(p, attrs))) 249 goto out; 250 251 err = -EINVAL; 252 switch (p->mode) { 253 case XFRM_MODE_TRANSPORT: 254 case XFRM_MODE_TUNNEL: 255 case XFRM_MODE_ROUTEOPTIMIZATION: 256 case XFRM_MODE_BEET: 257 break; 258 259 default: 260 goto out; 261 } 262 263 err = 0; 264 265 out: 266 return err; 267 } 268 269 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props, 270 struct xfrm_algo_desc *(*get_byname)(const char *, int), 271 struct nlattr *rta) 272 { 273 struct xfrm_algo *p, *ualg; 274 struct xfrm_algo_desc *algo; 275 276 if (!rta) 277 return 0; 278 279 ualg = nla_data(rta); 280 281 algo = get_byname(ualg->alg_name, 1); 282 if (!algo) 283 return -ENOSYS; 284 *props = algo->desc.sadb_alg_id; 285 286 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL); 287 if (!p) 288 return -ENOMEM; 289 290 strcpy(p->alg_name, algo->name); 291 *algpp = p; 292 return 0; 293 } 294 295 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props, 296 struct nlattr *rta) 297 { 298 struct xfrm_algo *ualg; 299 struct xfrm_algo_auth *p; 300 struct xfrm_algo_desc *algo; 301 302 if (!rta) 303 return 0; 304 305 ualg = nla_data(rta); 306 307 algo = xfrm_aalg_get_byname(ualg->alg_name, 1); 308 if (!algo) 309 return -ENOSYS; 310 *props = algo->desc.sadb_alg_id; 311 312 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL); 313 if (!p) 314 return -ENOMEM; 315 316 strcpy(p->alg_name, algo->name); 317 p->alg_key_len = ualg->alg_key_len; 318 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; 319 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8); 320 321 *algpp = p; 322 return 0; 323 } 324 325 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props, 326 struct nlattr *rta) 327 { 328 struct xfrm_algo_auth *p, *ualg; 329 struct xfrm_algo_desc *algo; 330 331 if (!rta) 332 return 0; 333 334 ualg = nla_data(rta); 335 336 algo = xfrm_aalg_get_byname(ualg->alg_name, 1); 337 if (!algo) 338 return -ENOSYS; 339 if ((ualg->alg_trunc_len / 8) > MAX_AH_AUTH_LEN || 340 ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits) 341 return -EINVAL; 342 *props = algo->desc.sadb_alg_id; 343 344 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL); 345 if (!p) 346 return -ENOMEM; 347 348 strcpy(p->alg_name, algo->name); 349 if (!p->alg_trunc_len) 350 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; 351 352 *algpp = p; 353 return 0; 354 } 355 356 static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props, 357 struct nlattr *rta) 358 { 359 struct xfrm_algo_aead *p, *ualg; 360 struct xfrm_algo_desc *algo; 361 362 if (!rta) 363 return 0; 364 365 ualg = nla_data(rta); 366 367 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1); 368 if (!algo) 369 return -ENOSYS; 370 *props = algo->desc.sadb_alg_id; 371 372 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL); 373 if (!p) 374 return -ENOMEM; 375 376 strcpy(p->alg_name, algo->name); 377 *algpp = p; 378 return 0; 379 } 380 381 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn, 382 struct nlattr *rp) 383 { 384 struct xfrm_replay_state_esn *up; 385 int ulen; 386 387 if (!replay_esn || !rp) 388 return 0; 389 390 up = nla_data(rp); 391 ulen = xfrm_replay_state_esn_len(up); 392 393 if (nla_len(rp) < ulen || xfrm_replay_state_esn_len(replay_esn) != ulen) 394 return -EINVAL; 395 396 return 0; 397 } 398 399 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn, 400 struct xfrm_replay_state_esn **preplay_esn, 401 struct nlattr *rta) 402 { 403 struct xfrm_replay_state_esn *p, *pp, *up; 404 int klen, ulen; 405 406 if (!rta) 407 return 0; 408 409 up = nla_data(rta); 410 klen = xfrm_replay_state_esn_len(up); 411 ulen = nla_len(rta) >= klen ? klen : sizeof(*up); 412 413 p = kzalloc(klen, GFP_KERNEL); 414 if (!p) 415 return -ENOMEM; 416 417 pp = kzalloc(klen, GFP_KERNEL); 418 if (!pp) { 419 kfree(p); 420 return -ENOMEM; 421 } 422 423 memcpy(p, up, ulen); 424 memcpy(pp, up, ulen); 425 426 *replay_esn = p; 427 *preplay_esn = pp; 428 429 return 0; 430 } 431 432 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx) 433 { 434 int len = 0; 435 436 if (xfrm_ctx) { 437 len += sizeof(struct xfrm_user_sec_ctx); 438 len += xfrm_ctx->ctx_len; 439 } 440 return len; 441 } 442 443 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 444 { 445 memcpy(&x->id, &p->id, sizeof(x->id)); 446 memcpy(&x->sel, &p->sel, sizeof(x->sel)); 447 memcpy(&x->lft, &p->lft, sizeof(x->lft)); 448 x->props.mode = p->mode; 449 x->props.replay_window = p->replay_window; 450 x->props.reqid = p->reqid; 451 x->props.family = p->family; 452 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr)); 453 x->props.flags = p->flags; 454 455 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC)) 456 x->sel.family = p->family; 457 } 458 459 /* 460 * someday when pfkey also has support, we could have the code 461 * somehow made shareable and move it to xfrm_state.c - JHS 462 * 463 */ 464 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs, 465 int update_esn) 466 { 467 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 468 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL; 469 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 470 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; 471 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; 472 473 if (re) { 474 struct xfrm_replay_state_esn *replay_esn; 475 replay_esn = nla_data(re); 476 memcpy(x->replay_esn, replay_esn, 477 xfrm_replay_state_esn_len(replay_esn)); 478 memcpy(x->preplay_esn, replay_esn, 479 xfrm_replay_state_esn_len(replay_esn)); 480 } 481 482 if (rp) { 483 struct xfrm_replay_state *replay; 484 replay = nla_data(rp); 485 memcpy(&x->replay, replay, sizeof(*replay)); 486 memcpy(&x->preplay, replay, sizeof(*replay)); 487 } 488 489 if (lt) { 490 struct xfrm_lifetime_cur *ltime; 491 ltime = nla_data(lt); 492 x->curlft.bytes = ltime->bytes; 493 x->curlft.packets = ltime->packets; 494 x->curlft.add_time = ltime->add_time; 495 x->curlft.use_time = ltime->use_time; 496 } 497 498 if (et) 499 x->replay_maxage = nla_get_u32(et); 500 501 if (rt) 502 x->replay_maxdiff = nla_get_u32(rt); 503 } 504 505 static struct xfrm_state *xfrm_state_construct(struct net *net, 506 struct xfrm_usersa_info *p, 507 struct nlattr **attrs, 508 int *errp) 509 { 510 struct xfrm_state *x = xfrm_state_alloc(net); 511 int err = -ENOMEM; 512 513 if (!x) 514 goto error_no_put; 515 516 copy_from_user_state(x, p); 517 518 if (attrs[XFRMA_SA_EXTRA_FLAGS]) 519 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]); 520 521 if ((err = attach_aead(&x->aead, &x->props.ealgo, 522 attrs[XFRMA_ALG_AEAD]))) 523 goto error; 524 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo, 525 attrs[XFRMA_ALG_AUTH_TRUNC]))) 526 goto error; 527 if (!x->props.aalgo) { 528 if ((err = attach_auth(&x->aalg, &x->props.aalgo, 529 attrs[XFRMA_ALG_AUTH]))) 530 goto error; 531 } 532 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo, 533 xfrm_ealg_get_byname, 534 attrs[XFRMA_ALG_CRYPT]))) 535 goto error; 536 if ((err = attach_one_algo(&x->calg, &x->props.calgo, 537 xfrm_calg_get_byname, 538 attrs[XFRMA_ALG_COMP]))) 539 goto error; 540 541 if (attrs[XFRMA_ENCAP]) { 542 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]), 543 sizeof(*x->encap), GFP_KERNEL); 544 if (x->encap == NULL) 545 goto error; 546 } 547 548 if (attrs[XFRMA_TFCPAD]) 549 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]); 550 551 if (attrs[XFRMA_COADDR]) { 552 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]), 553 sizeof(*x->coaddr), GFP_KERNEL); 554 if (x->coaddr == NULL) 555 goto error; 556 } 557 558 xfrm_mark_get(attrs, &x->mark); 559 560 err = __xfrm_init_state(x, false); 561 if (err) 562 goto error; 563 564 if (attrs[XFRMA_SEC_CTX] && 565 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX]))) 566 goto error; 567 568 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn, 569 attrs[XFRMA_REPLAY_ESN_VAL]))) 570 goto error; 571 572 x->km.seq = p->seq; 573 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth; 574 /* sysctl_xfrm_aevent_etime is in 100ms units */ 575 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M; 576 577 if ((err = xfrm_init_replay(x))) 578 goto error; 579 580 /* override default values from above */ 581 xfrm_update_ae_params(x, attrs, 0); 582 583 return x; 584 585 error: 586 x->km.state = XFRM_STATE_DEAD; 587 xfrm_state_put(x); 588 error_no_put: 589 *errp = err; 590 return NULL; 591 } 592 593 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 594 struct nlattr **attrs) 595 { 596 struct net *net = sock_net(skb->sk); 597 struct xfrm_usersa_info *p = nlmsg_data(nlh); 598 struct xfrm_state *x; 599 int err; 600 struct km_event c; 601 kuid_t loginuid = audit_get_loginuid(current); 602 u32 sessionid = audit_get_sessionid(current); 603 u32 sid; 604 605 err = verify_newsa_info(p, attrs); 606 if (err) 607 return err; 608 609 x = xfrm_state_construct(net, p, attrs, &err); 610 if (!x) 611 return err; 612 613 xfrm_state_hold(x); 614 if (nlh->nlmsg_type == XFRM_MSG_NEWSA) 615 err = xfrm_state_add(x); 616 else 617 err = xfrm_state_update(x); 618 619 security_task_getsecid(current, &sid); 620 xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid); 621 622 if (err < 0) { 623 x->km.state = XFRM_STATE_DEAD; 624 __xfrm_state_put(x); 625 goto out; 626 } 627 628 c.seq = nlh->nlmsg_seq; 629 c.portid = nlh->nlmsg_pid; 630 c.event = nlh->nlmsg_type; 631 632 km_state_notify(x, &c); 633 out: 634 xfrm_state_put(x); 635 return err; 636 } 637 638 static struct xfrm_state *xfrm_user_state_lookup(struct net *net, 639 struct xfrm_usersa_id *p, 640 struct nlattr **attrs, 641 int *errp) 642 { 643 struct xfrm_state *x = NULL; 644 struct xfrm_mark m; 645 int err; 646 u32 mark = xfrm_mark_get(attrs, &m); 647 648 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) { 649 err = -ESRCH; 650 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family); 651 } else { 652 xfrm_address_t *saddr = NULL; 653 654 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr); 655 if (!saddr) { 656 err = -EINVAL; 657 goto out; 658 } 659 660 err = -ESRCH; 661 x = xfrm_state_lookup_byaddr(net, mark, 662 &p->daddr, saddr, 663 p->proto, p->family); 664 } 665 666 out: 667 if (!x && errp) 668 *errp = err; 669 return x; 670 } 671 672 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 673 struct nlattr **attrs) 674 { 675 struct net *net = sock_net(skb->sk); 676 struct xfrm_state *x; 677 int err = -ESRCH; 678 struct km_event c; 679 struct xfrm_usersa_id *p = nlmsg_data(nlh); 680 kuid_t loginuid = audit_get_loginuid(current); 681 u32 sessionid = audit_get_sessionid(current); 682 u32 sid; 683 684 x = xfrm_user_state_lookup(net, p, attrs, &err); 685 if (x == NULL) 686 return err; 687 688 if ((err = security_xfrm_state_delete(x)) != 0) 689 goto out; 690 691 if (xfrm_state_kern(x)) { 692 err = -EPERM; 693 goto out; 694 } 695 696 err = xfrm_state_delete(x); 697 698 if (err < 0) 699 goto out; 700 701 c.seq = nlh->nlmsg_seq; 702 c.portid = nlh->nlmsg_pid; 703 c.event = nlh->nlmsg_type; 704 km_state_notify(x, &c); 705 706 out: 707 security_task_getsecid(current, &sid); 708 xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid); 709 xfrm_state_put(x); 710 return err; 711 } 712 713 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 714 { 715 memset(p, 0, sizeof(*p)); 716 memcpy(&p->id, &x->id, sizeof(p->id)); 717 memcpy(&p->sel, &x->sel, sizeof(p->sel)); 718 memcpy(&p->lft, &x->lft, sizeof(p->lft)); 719 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft)); 720 memcpy(&p->stats, &x->stats, sizeof(p->stats)); 721 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr)); 722 p->mode = x->props.mode; 723 p->replay_window = x->props.replay_window; 724 p->reqid = x->props.reqid; 725 p->family = x->props.family; 726 p->flags = x->props.flags; 727 p->seq = x->km.seq; 728 } 729 730 struct xfrm_dump_info { 731 struct sk_buff *in_skb; 732 struct sk_buff *out_skb; 733 u32 nlmsg_seq; 734 u16 nlmsg_flags; 735 }; 736 737 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb) 738 { 739 struct xfrm_user_sec_ctx *uctx; 740 struct nlattr *attr; 741 int ctx_size = sizeof(*uctx) + s->ctx_len; 742 743 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size); 744 if (attr == NULL) 745 return -EMSGSIZE; 746 747 uctx = nla_data(attr); 748 uctx->exttype = XFRMA_SEC_CTX; 749 uctx->len = ctx_size; 750 uctx->ctx_doi = s->ctx_doi; 751 uctx->ctx_alg = s->ctx_alg; 752 uctx->ctx_len = s->ctx_len; 753 memcpy(uctx + 1, s->ctx_str, s->ctx_len); 754 755 return 0; 756 } 757 758 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb) 759 { 760 struct xfrm_algo *algo; 761 struct nlattr *nla; 762 763 nla = nla_reserve(skb, XFRMA_ALG_AUTH, 764 sizeof(*algo) + (auth->alg_key_len + 7) / 8); 765 if (!nla) 766 return -EMSGSIZE; 767 768 algo = nla_data(nla); 769 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name)); 770 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8); 771 algo->alg_key_len = auth->alg_key_len; 772 773 return 0; 774 } 775 776 /* Don't change this without updating xfrm_sa_len! */ 777 static int copy_to_user_state_extra(struct xfrm_state *x, 778 struct xfrm_usersa_info *p, 779 struct sk_buff *skb) 780 { 781 int ret = 0; 782 783 copy_to_user_state(x, p); 784 785 if (x->props.extra_flags) { 786 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS, 787 x->props.extra_flags); 788 if (ret) 789 goto out; 790 } 791 792 if (x->coaddr) { 793 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr); 794 if (ret) 795 goto out; 796 } 797 if (x->lastused) { 798 ret = nla_put_u64(skb, XFRMA_LASTUSED, x->lastused); 799 if (ret) 800 goto out; 801 } 802 if (x->aead) { 803 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead); 804 if (ret) 805 goto out; 806 } 807 if (x->aalg) { 808 ret = copy_to_user_auth(x->aalg, skb); 809 if (!ret) 810 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC, 811 xfrm_alg_auth_len(x->aalg), x->aalg); 812 if (ret) 813 goto out; 814 } 815 if (x->ealg) { 816 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg); 817 if (ret) 818 goto out; 819 } 820 if (x->calg) { 821 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg); 822 if (ret) 823 goto out; 824 } 825 if (x->encap) { 826 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap); 827 if (ret) 828 goto out; 829 } 830 if (x->tfcpad) { 831 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad); 832 if (ret) 833 goto out; 834 } 835 ret = xfrm_mark_put(skb, &x->mark); 836 if (ret) 837 goto out; 838 if (x->replay_esn) { 839 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL, 840 xfrm_replay_state_esn_len(x->replay_esn), 841 x->replay_esn); 842 if (ret) 843 goto out; 844 } 845 if (x->security) 846 ret = copy_sec_ctx(x->security, skb); 847 out: 848 return ret; 849 } 850 851 static int dump_one_state(struct xfrm_state *x, int count, void *ptr) 852 { 853 struct xfrm_dump_info *sp = ptr; 854 struct sk_buff *in_skb = sp->in_skb; 855 struct sk_buff *skb = sp->out_skb; 856 struct xfrm_usersa_info *p; 857 struct nlmsghdr *nlh; 858 int err; 859 860 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, 861 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags); 862 if (nlh == NULL) 863 return -EMSGSIZE; 864 865 p = nlmsg_data(nlh); 866 867 err = copy_to_user_state_extra(x, p, skb); 868 if (err) { 869 nlmsg_cancel(skb, nlh); 870 return err; 871 } 872 nlmsg_end(skb, nlh); 873 return 0; 874 } 875 876 static int xfrm_dump_sa_done(struct netlink_callback *cb) 877 { 878 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 879 xfrm_state_walk_done(walk); 880 return 0; 881 } 882 883 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb) 884 { 885 struct net *net = sock_net(skb->sk); 886 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 887 struct xfrm_dump_info info; 888 889 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) > 890 sizeof(cb->args) - sizeof(cb->args[0])); 891 892 info.in_skb = cb->skb; 893 info.out_skb = skb; 894 info.nlmsg_seq = cb->nlh->nlmsg_seq; 895 info.nlmsg_flags = NLM_F_MULTI; 896 897 if (!cb->args[0]) { 898 cb->args[0] = 1; 899 xfrm_state_walk_init(walk, 0); 900 } 901 902 (void) xfrm_state_walk(net, walk, dump_one_state, &info); 903 904 return skb->len; 905 } 906 907 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb, 908 struct xfrm_state *x, u32 seq) 909 { 910 struct xfrm_dump_info info; 911 struct sk_buff *skb; 912 int err; 913 914 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 915 if (!skb) 916 return ERR_PTR(-ENOMEM); 917 918 info.in_skb = in_skb; 919 info.out_skb = skb; 920 info.nlmsg_seq = seq; 921 info.nlmsg_flags = 0; 922 923 err = dump_one_state(x, 0, &info); 924 if (err) { 925 kfree_skb(skb); 926 return ERR_PTR(err); 927 } 928 929 return skb; 930 } 931 932 static inline size_t xfrm_spdinfo_msgsize(void) 933 { 934 return NLMSG_ALIGN(4) 935 + nla_total_size(sizeof(struct xfrmu_spdinfo)) 936 + nla_total_size(sizeof(struct xfrmu_spdhinfo)); 937 } 938 939 static int build_spdinfo(struct sk_buff *skb, struct net *net, 940 u32 portid, u32 seq, u32 flags) 941 { 942 struct xfrmk_spdinfo si; 943 struct xfrmu_spdinfo spc; 944 struct xfrmu_spdhinfo sph; 945 struct nlmsghdr *nlh; 946 int err; 947 u32 *f; 948 949 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0); 950 if (nlh == NULL) /* shouldn't really happen ... */ 951 return -EMSGSIZE; 952 953 f = nlmsg_data(nlh); 954 *f = flags; 955 xfrm_spd_getinfo(net, &si); 956 spc.incnt = si.incnt; 957 spc.outcnt = si.outcnt; 958 spc.fwdcnt = si.fwdcnt; 959 spc.inscnt = si.inscnt; 960 spc.outscnt = si.outscnt; 961 spc.fwdscnt = si.fwdscnt; 962 sph.spdhcnt = si.spdhcnt; 963 sph.spdhmcnt = si.spdhmcnt; 964 965 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc); 966 if (!err) 967 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph); 968 if (err) { 969 nlmsg_cancel(skb, nlh); 970 return err; 971 } 972 973 return nlmsg_end(skb, nlh); 974 } 975 976 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 977 struct nlattr **attrs) 978 { 979 struct net *net = sock_net(skb->sk); 980 struct sk_buff *r_skb; 981 u32 *flags = nlmsg_data(nlh); 982 u32 sportid = NETLINK_CB(skb).portid; 983 u32 seq = nlh->nlmsg_seq; 984 985 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC); 986 if (r_skb == NULL) 987 return -ENOMEM; 988 989 if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0) 990 BUG(); 991 992 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); 993 } 994 995 static inline size_t xfrm_sadinfo_msgsize(void) 996 { 997 return NLMSG_ALIGN(4) 998 + nla_total_size(sizeof(struct xfrmu_sadhinfo)) 999 + nla_total_size(4); /* XFRMA_SAD_CNT */ 1000 } 1001 1002 static int build_sadinfo(struct sk_buff *skb, struct net *net, 1003 u32 portid, u32 seq, u32 flags) 1004 { 1005 struct xfrmk_sadinfo si; 1006 struct xfrmu_sadhinfo sh; 1007 struct nlmsghdr *nlh; 1008 int err; 1009 u32 *f; 1010 1011 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0); 1012 if (nlh == NULL) /* shouldn't really happen ... */ 1013 return -EMSGSIZE; 1014 1015 f = nlmsg_data(nlh); 1016 *f = flags; 1017 xfrm_sad_getinfo(net, &si); 1018 1019 sh.sadhmcnt = si.sadhmcnt; 1020 sh.sadhcnt = si.sadhcnt; 1021 1022 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt); 1023 if (!err) 1024 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh); 1025 if (err) { 1026 nlmsg_cancel(skb, nlh); 1027 return err; 1028 } 1029 1030 return nlmsg_end(skb, nlh); 1031 } 1032 1033 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1034 struct nlattr **attrs) 1035 { 1036 struct net *net = sock_net(skb->sk); 1037 struct sk_buff *r_skb; 1038 u32 *flags = nlmsg_data(nlh); 1039 u32 sportid = NETLINK_CB(skb).portid; 1040 u32 seq = nlh->nlmsg_seq; 1041 1042 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC); 1043 if (r_skb == NULL) 1044 return -ENOMEM; 1045 1046 if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0) 1047 BUG(); 1048 1049 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); 1050 } 1051 1052 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 1053 struct nlattr **attrs) 1054 { 1055 struct net *net = sock_net(skb->sk); 1056 struct xfrm_usersa_id *p = nlmsg_data(nlh); 1057 struct xfrm_state *x; 1058 struct sk_buff *resp_skb; 1059 int err = -ESRCH; 1060 1061 x = xfrm_user_state_lookup(net, p, attrs, &err); 1062 if (x == NULL) 1063 goto out_noput; 1064 1065 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 1066 if (IS_ERR(resp_skb)) { 1067 err = PTR_ERR(resp_skb); 1068 } else { 1069 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); 1070 } 1071 xfrm_state_put(x); 1072 out_noput: 1073 return err; 1074 } 1075 1076 static int verify_userspi_info(struct xfrm_userspi_info *p) 1077 { 1078 switch (p->info.id.proto) { 1079 case IPPROTO_AH: 1080 case IPPROTO_ESP: 1081 break; 1082 1083 case IPPROTO_COMP: 1084 /* IPCOMP spi is 16-bits. */ 1085 if (p->max >= 0x10000) 1086 return -EINVAL; 1087 break; 1088 1089 default: 1090 return -EINVAL; 1091 } 1092 1093 if (p->min > p->max) 1094 return -EINVAL; 1095 1096 return 0; 1097 } 1098 1099 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, 1100 struct nlattr **attrs) 1101 { 1102 struct net *net = sock_net(skb->sk); 1103 struct xfrm_state *x; 1104 struct xfrm_userspi_info *p; 1105 struct sk_buff *resp_skb; 1106 xfrm_address_t *daddr; 1107 int family; 1108 int err; 1109 u32 mark; 1110 struct xfrm_mark m; 1111 1112 p = nlmsg_data(nlh); 1113 err = verify_userspi_info(p); 1114 if (err) 1115 goto out_noput; 1116 1117 family = p->info.family; 1118 daddr = &p->info.id.daddr; 1119 1120 x = NULL; 1121 1122 mark = xfrm_mark_get(attrs, &m); 1123 if (p->info.seq) { 1124 x = xfrm_find_acq_byseq(net, mark, p->info.seq); 1125 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) { 1126 xfrm_state_put(x); 1127 x = NULL; 1128 } 1129 } 1130 1131 if (!x) 1132 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid, 1133 p->info.id.proto, daddr, 1134 &p->info.saddr, 1, 1135 family); 1136 err = -ENOENT; 1137 if (x == NULL) 1138 goto out_noput; 1139 1140 err = xfrm_alloc_spi(x, p->min, p->max); 1141 if (err) 1142 goto out; 1143 1144 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 1145 if (IS_ERR(resp_skb)) { 1146 err = PTR_ERR(resp_skb); 1147 goto out; 1148 } 1149 1150 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); 1151 1152 out: 1153 xfrm_state_put(x); 1154 out_noput: 1155 return err; 1156 } 1157 1158 static int verify_policy_dir(u8 dir) 1159 { 1160 switch (dir) { 1161 case XFRM_POLICY_IN: 1162 case XFRM_POLICY_OUT: 1163 case XFRM_POLICY_FWD: 1164 break; 1165 1166 default: 1167 return -EINVAL; 1168 } 1169 1170 return 0; 1171 } 1172 1173 static int verify_policy_type(u8 type) 1174 { 1175 switch (type) { 1176 case XFRM_POLICY_TYPE_MAIN: 1177 #ifdef CONFIG_XFRM_SUB_POLICY 1178 case XFRM_POLICY_TYPE_SUB: 1179 #endif 1180 break; 1181 1182 default: 1183 return -EINVAL; 1184 } 1185 1186 return 0; 1187 } 1188 1189 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p) 1190 { 1191 switch (p->share) { 1192 case XFRM_SHARE_ANY: 1193 case XFRM_SHARE_SESSION: 1194 case XFRM_SHARE_USER: 1195 case XFRM_SHARE_UNIQUE: 1196 break; 1197 1198 default: 1199 return -EINVAL; 1200 } 1201 1202 switch (p->action) { 1203 case XFRM_POLICY_ALLOW: 1204 case XFRM_POLICY_BLOCK: 1205 break; 1206 1207 default: 1208 return -EINVAL; 1209 } 1210 1211 switch (p->sel.family) { 1212 case AF_INET: 1213 break; 1214 1215 case AF_INET6: 1216 #if IS_ENABLED(CONFIG_IPV6) 1217 break; 1218 #else 1219 return -EAFNOSUPPORT; 1220 #endif 1221 1222 default: 1223 return -EINVAL; 1224 } 1225 1226 return verify_policy_dir(p->dir); 1227 } 1228 1229 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs) 1230 { 1231 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1232 struct xfrm_user_sec_ctx *uctx; 1233 1234 if (!rt) 1235 return 0; 1236 1237 uctx = nla_data(rt); 1238 return security_xfrm_policy_alloc(&pol->security, uctx); 1239 } 1240 1241 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut, 1242 int nr) 1243 { 1244 int i; 1245 1246 xp->xfrm_nr = nr; 1247 for (i = 0; i < nr; i++, ut++) { 1248 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 1249 1250 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id)); 1251 memcpy(&t->saddr, &ut->saddr, 1252 sizeof(xfrm_address_t)); 1253 t->reqid = ut->reqid; 1254 t->mode = ut->mode; 1255 t->share = ut->share; 1256 t->optional = ut->optional; 1257 t->aalgos = ut->aalgos; 1258 t->ealgos = ut->ealgos; 1259 t->calgos = ut->calgos; 1260 /* If all masks are ~0, then we allow all algorithms. */ 1261 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos); 1262 t->encap_family = ut->family; 1263 } 1264 } 1265 1266 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family) 1267 { 1268 int i; 1269 1270 if (nr > XFRM_MAX_DEPTH) 1271 return -EINVAL; 1272 1273 for (i = 0; i < nr; i++) { 1274 /* We never validated the ut->family value, so many 1275 * applications simply leave it at zero. The check was 1276 * never made and ut->family was ignored because all 1277 * templates could be assumed to have the same family as 1278 * the policy itself. Now that we will have ipv4-in-ipv6 1279 * and ipv6-in-ipv4 tunnels, this is no longer true. 1280 */ 1281 if (!ut[i].family) 1282 ut[i].family = family; 1283 1284 switch (ut[i].family) { 1285 case AF_INET: 1286 break; 1287 #if IS_ENABLED(CONFIG_IPV6) 1288 case AF_INET6: 1289 break; 1290 #endif 1291 default: 1292 return -EINVAL; 1293 } 1294 } 1295 1296 return 0; 1297 } 1298 1299 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs) 1300 { 1301 struct nlattr *rt = attrs[XFRMA_TMPL]; 1302 1303 if (!rt) { 1304 pol->xfrm_nr = 0; 1305 } else { 1306 struct xfrm_user_tmpl *utmpl = nla_data(rt); 1307 int nr = nla_len(rt) / sizeof(*utmpl); 1308 int err; 1309 1310 err = validate_tmpl(nr, utmpl, pol->family); 1311 if (err) 1312 return err; 1313 1314 copy_templates(pol, utmpl, nr); 1315 } 1316 return 0; 1317 } 1318 1319 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs) 1320 { 1321 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE]; 1322 struct xfrm_userpolicy_type *upt; 1323 u8 type = XFRM_POLICY_TYPE_MAIN; 1324 int err; 1325 1326 if (rt) { 1327 upt = nla_data(rt); 1328 type = upt->type; 1329 } 1330 1331 err = verify_policy_type(type); 1332 if (err) 1333 return err; 1334 1335 *tp = type; 1336 return 0; 1337 } 1338 1339 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p) 1340 { 1341 xp->priority = p->priority; 1342 xp->index = p->index; 1343 memcpy(&xp->selector, &p->sel, sizeof(xp->selector)); 1344 memcpy(&xp->lft, &p->lft, sizeof(xp->lft)); 1345 xp->action = p->action; 1346 xp->flags = p->flags; 1347 xp->family = p->sel.family; 1348 /* XXX xp->share = p->share; */ 1349 } 1350 1351 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir) 1352 { 1353 memset(p, 0, sizeof(*p)); 1354 memcpy(&p->sel, &xp->selector, sizeof(p->sel)); 1355 memcpy(&p->lft, &xp->lft, sizeof(p->lft)); 1356 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft)); 1357 p->priority = xp->priority; 1358 p->index = xp->index; 1359 p->sel.family = xp->family; 1360 p->dir = dir; 1361 p->action = xp->action; 1362 p->flags = xp->flags; 1363 p->share = XFRM_SHARE_ANY; /* XXX xp->share */ 1364 } 1365 1366 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp) 1367 { 1368 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL); 1369 int err; 1370 1371 if (!xp) { 1372 *errp = -ENOMEM; 1373 return NULL; 1374 } 1375 1376 copy_from_user_policy(xp, p); 1377 1378 err = copy_from_user_policy_type(&xp->type, attrs); 1379 if (err) 1380 goto error; 1381 1382 if (!(err = copy_from_user_tmpl(xp, attrs))) 1383 err = copy_from_user_sec_ctx(xp, attrs); 1384 if (err) 1385 goto error; 1386 1387 xfrm_mark_get(attrs, &xp->mark); 1388 1389 return xp; 1390 error: 1391 *errp = err; 1392 xp->walk.dead = 1; 1393 xfrm_policy_destroy(xp); 1394 return NULL; 1395 } 1396 1397 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1398 struct nlattr **attrs) 1399 { 1400 struct net *net = sock_net(skb->sk); 1401 struct xfrm_userpolicy_info *p = nlmsg_data(nlh); 1402 struct xfrm_policy *xp; 1403 struct km_event c; 1404 int err; 1405 int excl; 1406 kuid_t loginuid = audit_get_loginuid(current); 1407 u32 sessionid = audit_get_sessionid(current); 1408 u32 sid; 1409 1410 err = verify_newpolicy_info(p); 1411 if (err) 1412 return err; 1413 err = verify_sec_ctx_len(attrs); 1414 if (err) 1415 return err; 1416 1417 xp = xfrm_policy_construct(net, p, attrs, &err); 1418 if (!xp) 1419 return err; 1420 1421 /* shouldn't excl be based on nlh flags?? 1422 * Aha! this is anti-netlink really i.e more pfkey derived 1423 * in netlink excl is a flag and you wouldnt need 1424 * a type XFRM_MSG_UPDPOLICY - JHS */ 1425 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY; 1426 err = xfrm_policy_insert(p->dir, xp, excl); 1427 security_task_getsecid(current, &sid); 1428 xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid); 1429 1430 if (err) { 1431 security_xfrm_policy_free(xp->security); 1432 kfree(xp); 1433 return err; 1434 } 1435 1436 c.event = nlh->nlmsg_type; 1437 c.seq = nlh->nlmsg_seq; 1438 c.portid = nlh->nlmsg_pid; 1439 km_policy_notify(xp, p->dir, &c); 1440 1441 xfrm_pol_put(xp); 1442 1443 return 0; 1444 } 1445 1446 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb) 1447 { 1448 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH]; 1449 int i; 1450 1451 if (xp->xfrm_nr == 0) 1452 return 0; 1453 1454 for (i = 0; i < xp->xfrm_nr; i++) { 1455 struct xfrm_user_tmpl *up = &vec[i]; 1456 struct xfrm_tmpl *kp = &xp->xfrm_vec[i]; 1457 1458 memset(up, 0, sizeof(*up)); 1459 memcpy(&up->id, &kp->id, sizeof(up->id)); 1460 up->family = kp->encap_family; 1461 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr)); 1462 up->reqid = kp->reqid; 1463 up->mode = kp->mode; 1464 up->share = kp->share; 1465 up->optional = kp->optional; 1466 up->aalgos = kp->aalgos; 1467 up->ealgos = kp->ealgos; 1468 up->calgos = kp->calgos; 1469 } 1470 1471 return nla_put(skb, XFRMA_TMPL, 1472 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec); 1473 } 1474 1475 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb) 1476 { 1477 if (x->security) { 1478 return copy_sec_ctx(x->security, skb); 1479 } 1480 return 0; 1481 } 1482 1483 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb) 1484 { 1485 if (xp->security) 1486 return copy_sec_ctx(xp->security, skb); 1487 return 0; 1488 } 1489 static inline size_t userpolicy_type_attrsize(void) 1490 { 1491 #ifdef CONFIG_XFRM_SUB_POLICY 1492 return nla_total_size(sizeof(struct xfrm_userpolicy_type)); 1493 #else 1494 return 0; 1495 #endif 1496 } 1497 1498 #ifdef CONFIG_XFRM_SUB_POLICY 1499 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1500 { 1501 struct xfrm_userpolicy_type upt = { 1502 .type = type, 1503 }; 1504 1505 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt); 1506 } 1507 1508 #else 1509 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1510 { 1511 return 0; 1512 } 1513 #endif 1514 1515 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr) 1516 { 1517 struct xfrm_dump_info *sp = ptr; 1518 struct xfrm_userpolicy_info *p; 1519 struct sk_buff *in_skb = sp->in_skb; 1520 struct sk_buff *skb = sp->out_skb; 1521 struct nlmsghdr *nlh; 1522 int err; 1523 1524 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, 1525 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags); 1526 if (nlh == NULL) 1527 return -EMSGSIZE; 1528 1529 p = nlmsg_data(nlh); 1530 copy_to_user_policy(xp, p, dir); 1531 err = copy_to_user_tmpl(xp, skb); 1532 if (!err) 1533 err = copy_to_user_sec_ctx(xp, skb); 1534 if (!err) 1535 err = copy_to_user_policy_type(xp->type, skb); 1536 if (!err) 1537 err = xfrm_mark_put(skb, &xp->mark); 1538 if (err) { 1539 nlmsg_cancel(skb, nlh); 1540 return err; 1541 } 1542 nlmsg_end(skb, nlh); 1543 return 0; 1544 } 1545 1546 static int xfrm_dump_policy_done(struct netlink_callback *cb) 1547 { 1548 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1]; 1549 1550 xfrm_policy_walk_done(walk); 1551 return 0; 1552 } 1553 1554 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb) 1555 { 1556 struct net *net = sock_net(skb->sk); 1557 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1]; 1558 struct xfrm_dump_info info; 1559 1560 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) > 1561 sizeof(cb->args) - sizeof(cb->args[0])); 1562 1563 info.in_skb = cb->skb; 1564 info.out_skb = skb; 1565 info.nlmsg_seq = cb->nlh->nlmsg_seq; 1566 info.nlmsg_flags = NLM_F_MULTI; 1567 1568 if (!cb->args[0]) { 1569 cb->args[0] = 1; 1570 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY); 1571 } 1572 1573 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info); 1574 1575 return skb->len; 1576 } 1577 1578 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb, 1579 struct xfrm_policy *xp, 1580 int dir, u32 seq) 1581 { 1582 struct xfrm_dump_info info; 1583 struct sk_buff *skb; 1584 int err; 1585 1586 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1587 if (!skb) 1588 return ERR_PTR(-ENOMEM); 1589 1590 info.in_skb = in_skb; 1591 info.out_skb = skb; 1592 info.nlmsg_seq = seq; 1593 info.nlmsg_flags = 0; 1594 1595 err = dump_one_policy(xp, dir, 0, &info); 1596 if (err) { 1597 kfree_skb(skb); 1598 return ERR_PTR(err); 1599 } 1600 1601 return skb; 1602 } 1603 1604 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1605 struct nlattr **attrs) 1606 { 1607 struct net *net = sock_net(skb->sk); 1608 struct xfrm_policy *xp; 1609 struct xfrm_userpolicy_id *p; 1610 u8 type = XFRM_POLICY_TYPE_MAIN; 1611 int err; 1612 struct km_event c; 1613 int delete; 1614 struct xfrm_mark m; 1615 u32 mark = xfrm_mark_get(attrs, &m); 1616 1617 p = nlmsg_data(nlh); 1618 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY; 1619 1620 err = copy_from_user_policy_type(&type, attrs); 1621 if (err) 1622 return err; 1623 1624 err = verify_policy_dir(p->dir); 1625 if (err) 1626 return err; 1627 1628 if (p->index) 1629 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err); 1630 else { 1631 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1632 struct xfrm_sec_ctx *ctx; 1633 1634 err = verify_sec_ctx_len(attrs); 1635 if (err) 1636 return err; 1637 1638 ctx = NULL; 1639 if (rt) { 1640 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 1641 1642 err = security_xfrm_policy_alloc(&ctx, uctx); 1643 if (err) 1644 return err; 1645 } 1646 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel, 1647 ctx, delete, &err); 1648 security_xfrm_policy_free(ctx); 1649 } 1650 if (xp == NULL) 1651 return -ENOENT; 1652 1653 if (!delete) { 1654 struct sk_buff *resp_skb; 1655 1656 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq); 1657 if (IS_ERR(resp_skb)) { 1658 err = PTR_ERR(resp_skb); 1659 } else { 1660 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, 1661 NETLINK_CB(skb).portid); 1662 } 1663 } else { 1664 kuid_t loginuid = audit_get_loginuid(current); 1665 u32 sessionid = audit_get_sessionid(current); 1666 u32 sid; 1667 1668 security_task_getsecid(current, &sid); 1669 xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid, 1670 sid); 1671 1672 if (err != 0) 1673 goto out; 1674 1675 c.data.byid = p->index; 1676 c.event = nlh->nlmsg_type; 1677 c.seq = nlh->nlmsg_seq; 1678 c.portid = nlh->nlmsg_pid; 1679 km_policy_notify(xp, p->dir, &c); 1680 } 1681 1682 out: 1683 xfrm_pol_put(xp); 1684 if (delete && err == 0) 1685 xfrm_garbage_collect(net); 1686 return err; 1687 } 1688 1689 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 1690 struct nlattr **attrs) 1691 { 1692 struct net *net = sock_net(skb->sk); 1693 struct km_event c; 1694 struct xfrm_usersa_flush *p = nlmsg_data(nlh); 1695 struct xfrm_audit audit_info; 1696 int err; 1697 1698 audit_info.loginuid = audit_get_loginuid(current); 1699 audit_info.sessionid = audit_get_sessionid(current); 1700 security_task_getsecid(current, &audit_info.secid); 1701 err = xfrm_state_flush(net, p->proto, &audit_info); 1702 if (err) { 1703 if (err == -ESRCH) /* empty table */ 1704 return 0; 1705 return err; 1706 } 1707 c.data.proto = p->proto; 1708 c.event = nlh->nlmsg_type; 1709 c.seq = nlh->nlmsg_seq; 1710 c.portid = nlh->nlmsg_pid; 1711 c.net = net; 1712 km_state_notify(NULL, &c); 1713 1714 return 0; 1715 } 1716 1717 static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x) 1718 { 1719 size_t replay_size = x->replay_esn ? 1720 xfrm_replay_state_esn_len(x->replay_esn) : 1721 sizeof(struct xfrm_replay_state); 1722 1723 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id)) 1724 + nla_total_size(replay_size) 1725 + nla_total_size(sizeof(struct xfrm_lifetime_cur)) 1726 + nla_total_size(sizeof(struct xfrm_mark)) 1727 + nla_total_size(4) /* XFRM_AE_RTHR */ 1728 + nla_total_size(4); /* XFRM_AE_ETHR */ 1729 } 1730 1731 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 1732 { 1733 struct xfrm_aevent_id *id; 1734 struct nlmsghdr *nlh; 1735 int err; 1736 1737 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0); 1738 if (nlh == NULL) 1739 return -EMSGSIZE; 1740 1741 id = nlmsg_data(nlh); 1742 memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr)); 1743 id->sa_id.spi = x->id.spi; 1744 id->sa_id.family = x->props.family; 1745 id->sa_id.proto = x->id.proto; 1746 memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr)); 1747 id->reqid = x->props.reqid; 1748 id->flags = c->data.aevent; 1749 1750 if (x->replay_esn) { 1751 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL, 1752 xfrm_replay_state_esn_len(x->replay_esn), 1753 x->replay_esn); 1754 } else { 1755 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), 1756 &x->replay); 1757 } 1758 if (err) 1759 goto out_cancel; 1760 err = nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft); 1761 if (err) 1762 goto out_cancel; 1763 1764 if (id->flags & XFRM_AE_RTHR) { 1765 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff); 1766 if (err) 1767 goto out_cancel; 1768 } 1769 if (id->flags & XFRM_AE_ETHR) { 1770 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH, 1771 x->replay_maxage * 10 / HZ); 1772 if (err) 1773 goto out_cancel; 1774 } 1775 err = xfrm_mark_put(skb, &x->mark); 1776 if (err) 1777 goto out_cancel; 1778 1779 return nlmsg_end(skb, nlh); 1780 1781 out_cancel: 1782 nlmsg_cancel(skb, nlh); 1783 return err; 1784 } 1785 1786 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 1787 struct nlattr **attrs) 1788 { 1789 struct net *net = sock_net(skb->sk); 1790 struct xfrm_state *x; 1791 struct sk_buff *r_skb; 1792 int err; 1793 struct km_event c; 1794 u32 mark; 1795 struct xfrm_mark m; 1796 struct xfrm_aevent_id *p = nlmsg_data(nlh); 1797 struct xfrm_usersa_id *id = &p->sa_id; 1798 1799 mark = xfrm_mark_get(attrs, &m); 1800 1801 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family); 1802 if (x == NULL) 1803 return -ESRCH; 1804 1805 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 1806 if (r_skb == NULL) { 1807 xfrm_state_put(x); 1808 return -ENOMEM; 1809 } 1810 1811 /* 1812 * XXX: is this lock really needed - none of the other 1813 * gets lock (the concern is things getting updated 1814 * while we are still reading) - jhs 1815 */ 1816 spin_lock_bh(&x->lock); 1817 c.data.aevent = p->flags; 1818 c.seq = nlh->nlmsg_seq; 1819 c.portid = nlh->nlmsg_pid; 1820 1821 if (build_aevent(r_skb, x, &c) < 0) 1822 BUG(); 1823 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid); 1824 spin_unlock_bh(&x->lock); 1825 xfrm_state_put(x); 1826 return err; 1827 } 1828 1829 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 1830 struct nlattr **attrs) 1831 { 1832 struct net *net = sock_net(skb->sk); 1833 struct xfrm_state *x; 1834 struct km_event c; 1835 int err = - EINVAL; 1836 u32 mark = 0; 1837 struct xfrm_mark m; 1838 struct xfrm_aevent_id *p = nlmsg_data(nlh); 1839 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 1840 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL]; 1841 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 1842 1843 if (!lt && !rp && !re) 1844 return err; 1845 1846 /* pedantic mode - thou shalt sayeth replaceth */ 1847 if (!(nlh->nlmsg_flags&NLM_F_REPLACE)) 1848 return err; 1849 1850 mark = xfrm_mark_get(attrs, &m); 1851 1852 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family); 1853 if (x == NULL) 1854 return -ESRCH; 1855 1856 if (x->km.state != XFRM_STATE_VALID) 1857 goto out; 1858 1859 err = xfrm_replay_verify_len(x->replay_esn, rp); 1860 if (err) 1861 goto out; 1862 1863 spin_lock_bh(&x->lock); 1864 xfrm_update_ae_params(x, attrs, 1); 1865 spin_unlock_bh(&x->lock); 1866 1867 c.event = nlh->nlmsg_type; 1868 c.seq = nlh->nlmsg_seq; 1869 c.portid = nlh->nlmsg_pid; 1870 c.data.aevent = XFRM_AE_CU; 1871 km_state_notify(x, &c); 1872 err = 0; 1873 out: 1874 xfrm_state_put(x); 1875 return err; 1876 } 1877 1878 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1879 struct nlattr **attrs) 1880 { 1881 struct net *net = sock_net(skb->sk); 1882 struct km_event c; 1883 u8 type = XFRM_POLICY_TYPE_MAIN; 1884 int err; 1885 struct xfrm_audit audit_info; 1886 1887 err = copy_from_user_policy_type(&type, attrs); 1888 if (err) 1889 return err; 1890 1891 audit_info.loginuid = audit_get_loginuid(current); 1892 audit_info.sessionid = audit_get_sessionid(current); 1893 security_task_getsecid(current, &audit_info.secid); 1894 err = xfrm_policy_flush(net, type, &audit_info); 1895 if (err) { 1896 if (err == -ESRCH) /* empty table */ 1897 return 0; 1898 return err; 1899 } 1900 1901 c.data.type = type; 1902 c.event = nlh->nlmsg_type; 1903 c.seq = nlh->nlmsg_seq; 1904 c.portid = nlh->nlmsg_pid; 1905 c.net = net; 1906 km_policy_notify(NULL, 0, &c); 1907 return 0; 1908 } 1909 1910 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 1911 struct nlattr **attrs) 1912 { 1913 struct net *net = sock_net(skb->sk); 1914 struct xfrm_policy *xp; 1915 struct xfrm_user_polexpire *up = nlmsg_data(nlh); 1916 struct xfrm_userpolicy_info *p = &up->pol; 1917 u8 type = XFRM_POLICY_TYPE_MAIN; 1918 int err = -ENOENT; 1919 struct xfrm_mark m; 1920 u32 mark = xfrm_mark_get(attrs, &m); 1921 1922 err = copy_from_user_policy_type(&type, attrs); 1923 if (err) 1924 return err; 1925 1926 err = verify_policy_dir(p->dir); 1927 if (err) 1928 return err; 1929 1930 if (p->index) 1931 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err); 1932 else { 1933 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1934 struct xfrm_sec_ctx *ctx; 1935 1936 err = verify_sec_ctx_len(attrs); 1937 if (err) 1938 return err; 1939 1940 ctx = NULL; 1941 if (rt) { 1942 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 1943 1944 err = security_xfrm_policy_alloc(&ctx, uctx); 1945 if (err) 1946 return err; 1947 } 1948 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, 1949 &p->sel, ctx, 0, &err); 1950 security_xfrm_policy_free(ctx); 1951 } 1952 if (xp == NULL) 1953 return -ENOENT; 1954 1955 if (unlikely(xp->walk.dead)) 1956 goto out; 1957 1958 err = 0; 1959 if (up->hard) { 1960 kuid_t loginuid = audit_get_loginuid(current); 1961 u32 sessionid = audit_get_sessionid(current); 1962 u32 sid; 1963 1964 security_task_getsecid(current, &sid); 1965 xfrm_policy_delete(xp, p->dir); 1966 xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid); 1967 1968 } else { 1969 // reset the timers here? 1970 WARN(1, "Dont know what to do with soft policy expire\n"); 1971 } 1972 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid); 1973 1974 out: 1975 xfrm_pol_put(xp); 1976 return err; 1977 } 1978 1979 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 1980 struct nlattr **attrs) 1981 { 1982 struct net *net = sock_net(skb->sk); 1983 struct xfrm_state *x; 1984 int err; 1985 struct xfrm_user_expire *ue = nlmsg_data(nlh); 1986 struct xfrm_usersa_info *p = &ue->state; 1987 struct xfrm_mark m; 1988 u32 mark = xfrm_mark_get(attrs, &m); 1989 1990 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family); 1991 1992 err = -ENOENT; 1993 if (x == NULL) 1994 return err; 1995 1996 spin_lock_bh(&x->lock); 1997 err = -EINVAL; 1998 if (x->km.state != XFRM_STATE_VALID) 1999 goto out; 2000 km_state_expired(x, ue->hard, nlh->nlmsg_pid); 2001 2002 if (ue->hard) { 2003 kuid_t loginuid = audit_get_loginuid(current); 2004 u32 sessionid = audit_get_sessionid(current); 2005 u32 sid; 2006 2007 security_task_getsecid(current, &sid); 2008 __xfrm_state_delete(x); 2009 xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid); 2010 } 2011 err = 0; 2012 out: 2013 spin_unlock_bh(&x->lock); 2014 xfrm_state_put(x); 2015 return err; 2016 } 2017 2018 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, 2019 struct nlattr **attrs) 2020 { 2021 struct net *net = sock_net(skb->sk); 2022 struct xfrm_policy *xp; 2023 struct xfrm_user_tmpl *ut; 2024 int i; 2025 struct nlattr *rt = attrs[XFRMA_TMPL]; 2026 struct xfrm_mark mark; 2027 2028 struct xfrm_user_acquire *ua = nlmsg_data(nlh); 2029 struct xfrm_state *x = xfrm_state_alloc(net); 2030 int err = -ENOMEM; 2031 2032 if (!x) 2033 goto nomem; 2034 2035 xfrm_mark_get(attrs, &mark); 2036 2037 err = verify_newpolicy_info(&ua->policy); 2038 if (err) 2039 goto bad_policy; 2040 2041 /* build an XP */ 2042 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err); 2043 if (!xp) 2044 goto free_state; 2045 2046 memcpy(&x->id, &ua->id, sizeof(ua->id)); 2047 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr)); 2048 memcpy(&x->sel, &ua->sel, sizeof(ua->sel)); 2049 xp->mark.m = x->mark.m = mark.m; 2050 xp->mark.v = x->mark.v = mark.v; 2051 ut = nla_data(rt); 2052 /* extract the templates and for each call km_key */ 2053 for (i = 0; i < xp->xfrm_nr; i++, ut++) { 2054 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 2055 memcpy(&x->id, &t->id, sizeof(x->id)); 2056 x->props.mode = t->mode; 2057 x->props.reqid = t->reqid; 2058 x->props.family = ut->family; 2059 t->aalgos = ua->aalgos; 2060 t->ealgos = ua->ealgos; 2061 t->calgos = ua->calgos; 2062 err = km_query(x, t, xp); 2063 2064 } 2065 2066 kfree(x); 2067 kfree(xp); 2068 2069 return 0; 2070 2071 bad_policy: 2072 WARN(1, "BAD policy passed\n"); 2073 free_state: 2074 kfree(x); 2075 nomem: 2076 return err; 2077 } 2078 2079 #ifdef CONFIG_XFRM_MIGRATE 2080 static int copy_from_user_migrate(struct xfrm_migrate *ma, 2081 struct xfrm_kmaddress *k, 2082 struct nlattr **attrs, int *num) 2083 { 2084 struct nlattr *rt = attrs[XFRMA_MIGRATE]; 2085 struct xfrm_user_migrate *um; 2086 int i, num_migrate; 2087 2088 if (k != NULL) { 2089 struct xfrm_user_kmaddress *uk; 2090 2091 uk = nla_data(attrs[XFRMA_KMADDRESS]); 2092 memcpy(&k->local, &uk->local, sizeof(k->local)); 2093 memcpy(&k->remote, &uk->remote, sizeof(k->remote)); 2094 k->family = uk->family; 2095 k->reserved = uk->reserved; 2096 } 2097 2098 um = nla_data(rt); 2099 num_migrate = nla_len(rt) / sizeof(*um); 2100 2101 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH) 2102 return -EINVAL; 2103 2104 for (i = 0; i < num_migrate; i++, um++, ma++) { 2105 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr)); 2106 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr)); 2107 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr)); 2108 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr)); 2109 2110 ma->proto = um->proto; 2111 ma->mode = um->mode; 2112 ma->reqid = um->reqid; 2113 2114 ma->old_family = um->old_family; 2115 ma->new_family = um->new_family; 2116 } 2117 2118 *num = i; 2119 return 0; 2120 } 2121 2122 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 2123 struct nlattr **attrs) 2124 { 2125 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh); 2126 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 2127 struct xfrm_kmaddress km, *kmp; 2128 u8 type; 2129 int err; 2130 int n = 0; 2131 2132 if (attrs[XFRMA_MIGRATE] == NULL) 2133 return -EINVAL; 2134 2135 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL; 2136 2137 err = copy_from_user_policy_type(&type, attrs); 2138 if (err) 2139 return err; 2140 2141 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n); 2142 if (err) 2143 return err; 2144 2145 if (!n) 2146 return 0; 2147 2148 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp); 2149 2150 return 0; 2151 } 2152 #else 2153 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 2154 struct nlattr **attrs) 2155 { 2156 return -ENOPROTOOPT; 2157 } 2158 #endif 2159 2160 #ifdef CONFIG_XFRM_MIGRATE 2161 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb) 2162 { 2163 struct xfrm_user_migrate um; 2164 2165 memset(&um, 0, sizeof(um)); 2166 um.proto = m->proto; 2167 um.mode = m->mode; 2168 um.reqid = m->reqid; 2169 um.old_family = m->old_family; 2170 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr)); 2171 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr)); 2172 um.new_family = m->new_family; 2173 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr)); 2174 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr)); 2175 2176 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um); 2177 } 2178 2179 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb) 2180 { 2181 struct xfrm_user_kmaddress uk; 2182 2183 memset(&uk, 0, sizeof(uk)); 2184 uk.family = k->family; 2185 uk.reserved = k->reserved; 2186 memcpy(&uk.local, &k->local, sizeof(uk.local)); 2187 memcpy(&uk.remote, &k->remote, sizeof(uk.remote)); 2188 2189 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk); 2190 } 2191 2192 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma) 2193 { 2194 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id)) 2195 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0) 2196 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate) 2197 + userpolicy_type_attrsize(); 2198 } 2199 2200 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m, 2201 int num_migrate, const struct xfrm_kmaddress *k, 2202 const struct xfrm_selector *sel, u8 dir, u8 type) 2203 { 2204 const struct xfrm_migrate *mp; 2205 struct xfrm_userpolicy_id *pol_id; 2206 struct nlmsghdr *nlh; 2207 int i, err; 2208 2209 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0); 2210 if (nlh == NULL) 2211 return -EMSGSIZE; 2212 2213 pol_id = nlmsg_data(nlh); 2214 /* copy data from selector, dir, and type to the pol_id */ 2215 memset(pol_id, 0, sizeof(*pol_id)); 2216 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel)); 2217 pol_id->dir = dir; 2218 2219 if (k != NULL) { 2220 err = copy_to_user_kmaddress(k, skb); 2221 if (err) 2222 goto out_cancel; 2223 } 2224 err = copy_to_user_policy_type(type, skb); 2225 if (err) 2226 goto out_cancel; 2227 for (i = 0, mp = m ; i < num_migrate; i++, mp++) { 2228 err = copy_to_user_migrate(mp, skb); 2229 if (err) 2230 goto out_cancel; 2231 } 2232 2233 return nlmsg_end(skb, nlh); 2234 2235 out_cancel: 2236 nlmsg_cancel(skb, nlh); 2237 return err; 2238 } 2239 2240 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2241 const struct xfrm_migrate *m, int num_migrate, 2242 const struct xfrm_kmaddress *k) 2243 { 2244 struct net *net = &init_net; 2245 struct sk_buff *skb; 2246 2247 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC); 2248 if (skb == NULL) 2249 return -ENOMEM; 2250 2251 /* build migrate */ 2252 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0) 2253 BUG(); 2254 2255 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC); 2256 } 2257 #else 2258 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2259 const struct xfrm_migrate *m, int num_migrate, 2260 const struct xfrm_kmaddress *k) 2261 { 2262 return -ENOPROTOOPT; 2263 } 2264 #endif 2265 2266 #define XMSGSIZE(type) sizeof(struct type) 2267 2268 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = { 2269 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2270 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2271 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2272 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2273 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2274 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2275 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info), 2276 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire), 2277 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire), 2278 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2279 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2280 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire), 2281 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush), 2282 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0, 2283 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2284 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2285 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report), 2286 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2287 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32), 2288 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 2289 }; 2290 2291 #undef XMSGSIZE 2292 2293 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = { 2294 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)}, 2295 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)}, 2296 [XFRMA_LASTUSED] = { .type = NLA_U64}, 2297 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)}, 2298 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) }, 2299 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) }, 2300 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) }, 2301 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) }, 2302 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) }, 2303 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) }, 2304 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) }, 2305 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) }, 2306 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) }, 2307 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 }, 2308 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 }, 2309 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) }, 2310 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) }, 2311 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)}, 2312 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) }, 2313 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) }, 2314 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) }, 2315 [XFRMA_TFCPAD] = { .type = NLA_U32 }, 2316 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) }, 2317 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 }, 2318 }; 2319 2320 static const struct xfrm_link { 2321 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **); 2322 int (*dump)(struct sk_buff *, struct netlink_callback *); 2323 int (*done)(struct netlink_callback *); 2324 } xfrm_dispatch[XFRM_NR_MSGTYPES] = { 2325 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 2326 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa }, 2327 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa, 2328 .dump = xfrm_dump_sa, 2329 .done = xfrm_dump_sa_done }, 2330 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 2331 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy }, 2332 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy, 2333 .dump = xfrm_dump_policy, 2334 .done = xfrm_dump_policy_done }, 2335 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi }, 2336 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire }, 2337 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire }, 2338 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 2339 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 2340 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire}, 2341 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa }, 2342 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy }, 2343 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae }, 2344 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae }, 2345 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate }, 2346 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo }, 2347 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo }, 2348 }; 2349 2350 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 2351 { 2352 struct net *net = sock_net(skb->sk); 2353 struct nlattr *attrs[XFRMA_MAX+1]; 2354 const struct xfrm_link *link; 2355 int type, err; 2356 2357 type = nlh->nlmsg_type; 2358 if (type > XFRM_MSG_MAX) 2359 return -EINVAL; 2360 2361 type -= XFRM_MSG_BASE; 2362 link = &xfrm_dispatch[type]; 2363 2364 /* All operations require privileges, even GET */ 2365 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2366 return -EPERM; 2367 2368 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) || 2369 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) && 2370 (nlh->nlmsg_flags & NLM_F_DUMP)) { 2371 if (link->dump == NULL) 2372 return -EINVAL; 2373 2374 { 2375 struct netlink_dump_control c = { 2376 .dump = link->dump, 2377 .done = link->done, 2378 }; 2379 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c); 2380 } 2381 } 2382 2383 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX, 2384 xfrma_policy); 2385 if (err < 0) 2386 return err; 2387 2388 if (link->doit == NULL) 2389 return -EINVAL; 2390 2391 return link->doit(skb, nlh, attrs); 2392 } 2393 2394 static void xfrm_netlink_rcv(struct sk_buff *skb) 2395 { 2396 mutex_lock(&xfrm_cfg_mutex); 2397 netlink_rcv_skb(skb, &xfrm_user_rcv_msg); 2398 mutex_unlock(&xfrm_cfg_mutex); 2399 } 2400 2401 static inline size_t xfrm_expire_msgsize(void) 2402 { 2403 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire)) 2404 + nla_total_size(sizeof(struct xfrm_mark)); 2405 } 2406 2407 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 2408 { 2409 struct xfrm_user_expire *ue; 2410 struct nlmsghdr *nlh; 2411 int err; 2412 2413 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0); 2414 if (nlh == NULL) 2415 return -EMSGSIZE; 2416 2417 ue = nlmsg_data(nlh); 2418 copy_to_user_state(x, &ue->state); 2419 ue->hard = (c->data.hard != 0) ? 1 : 0; 2420 2421 err = xfrm_mark_put(skb, &x->mark); 2422 if (err) 2423 return err; 2424 2425 return nlmsg_end(skb, nlh); 2426 } 2427 2428 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c) 2429 { 2430 struct net *net = xs_net(x); 2431 struct sk_buff *skb; 2432 2433 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC); 2434 if (skb == NULL) 2435 return -ENOMEM; 2436 2437 if (build_expire(skb, x, c) < 0) { 2438 kfree_skb(skb); 2439 return -EMSGSIZE; 2440 } 2441 2442 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC); 2443 } 2444 2445 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c) 2446 { 2447 struct net *net = xs_net(x); 2448 struct sk_buff *skb; 2449 2450 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 2451 if (skb == NULL) 2452 return -ENOMEM; 2453 2454 if (build_aevent(skb, x, c) < 0) 2455 BUG(); 2456 2457 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC); 2458 } 2459 2460 static int xfrm_notify_sa_flush(const struct km_event *c) 2461 { 2462 struct net *net = c->net; 2463 struct xfrm_usersa_flush *p; 2464 struct nlmsghdr *nlh; 2465 struct sk_buff *skb; 2466 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush)); 2467 2468 skb = nlmsg_new(len, GFP_ATOMIC); 2469 if (skb == NULL) 2470 return -ENOMEM; 2471 2472 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0); 2473 if (nlh == NULL) { 2474 kfree_skb(skb); 2475 return -EMSGSIZE; 2476 } 2477 2478 p = nlmsg_data(nlh); 2479 p->proto = c->data.proto; 2480 2481 nlmsg_end(skb, nlh); 2482 2483 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC); 2484 } 2485 2486 static inline size_t xfrm_sa_len(struct xfrm_state *x) 2487 { 2488 size_t l = 0; 2489 if (x->aead) 2490 l += nla_total_size(aead_len(x->aead)); 2491 if (x->aalg) { 2492 l += nla_total_size(sizeof(struct xfrm_algo) + 2493 (x->aalg->alg_key_len + 7) / 8); 2494 l += nla_total_size(xfrm_alg_auth_len(x->aalg)); 2495 } 2496 if (x->ealg) 2497 l += nla_total_size(xfrm_alg_len(x->ealg)); 2498 if (x->calg) 2499 l += nla_total_size(sizeof(*x->calg)); 2500 if (x->encap) 2501 l += nla_total_size(sizeof(*x->encap)); 2502 if (x->tfcpad) 2503 l += nla_total_size(sizeof(x->tfcpad)); 2504 if (x->replay_esn) 2505 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn)); 2506 if (x->security) 2507 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) + 2508 x->security->ctx_len); 2509 if (x->coaddr) 2510 l += nla_total_size(sizeof(*x->coaddr)); 2511 if (x->props.extra_flags) 2512 l += nla_total_size(sizeof(x->props.extra_flags)); 2513 2514 /* Must count x->lastused as it may become non-zero behind our back. */ 2515 l += nla_total_size(sizeof(u64)); 2516 2517 return l; 2518 } 2519 2520 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c) 2521 { 2522 struct net *net = xs_net(x); 2523 struct xfrm_usersa_info *p; 2524 struct xfrm_usersa_id *id; 2525 struct nlmsghdr *nlh; 2526 struct sk_buff *skb; 2527 int len = xfrm_sa_len(x); 2528 int headlen, err; 2529 2530 headlen = sizeof(*p); 2531 if (c->event == XFRM_MSG_DELSA) { 2532 len += nla_total_size(headlen); 2533 headlen = sizeof(*id); 2534 len += nla_total_size(sizeof(struct xfrm_mark)); 2535 } 2536 len += NLMSG_ALIGN(headlen); 2537 2538 skb = nlmsg_new(len, GFP_ATOMIC); 2539 if (skb == NULL) 2540 return -ENOMEM; 2541 2542 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); 2543 err = -EMSGSIZE; 2544 if (nlh == NULL) 2545 goto out_free_skb; 2546 2547 p = nlmsg_data(nlh); 2548 if (c->event == XFRM_MSG_DELSA) { 2549 struct nlattr *attr; 2550 2551 id = nlmsg_data(nlh); 2552 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr)); 2553 id->spi = x->id.spi; 2554 id->family = x->props.family; 2555 id->proto = x->id.proto; 2556 2557 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p)); 2558 err = -EMSGSIZE; 2559 if (attr == NULL) 2560 goto out_free_skb; 2561 2562 p = nla_data(attr); 2563 } 2564 err = copy_to_user_state_extra(x, p, skb); 2565 if (err) 2566 goto out_free_skb; 2567 2568 nlmsg_end(skb, nlh); 2569 2570 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC); 2571 2572 out_free_skb: 2573 kfree_skb(skb); 2574 return err; 2575 } 2576 2577 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c) 2578 { 2579 2580 switch (c->event) { 2581 case XFRM_MSG_EXPIRE: 2582 return xfrm_exp_state_notify(x, c); 2583 case XFRM_MSG_NEWAE: 2584 return xfrm_aevent_state_notify(x, c); 2585 case XFRM_MSG_DELSA: 2586 case XFRM_MSG_UPDSA: 2587 case XFRM_MSG_NEWSA: 2588 return xfrm_notify_sa(x, c); 2589 case XFRM_MSG_FLUSHSA: 2590 return xfrm_notify_sa_flush(c); 2591 default: 2592 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n", 2593 c->event); 2594 break; 2595 } 2596 2597 return 0; 2598 2599 } 2600 2601 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x, 2602 struct xfrm_policy *xp) 2603 { 2604 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire)) 2605 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 2606 + nla_total_size(sizeof(struct xfrm_mark)) 2607 + nla_total_size(xfrm_user_sec_ctx_size(x->security)) 2608 + userpolicy_type_attrsize(); 2609 } 2610 2611 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x, 2612 struct xfrm_tmpl *xt, struct xfrm_policy *xp) 2613 { 2614 __u32 seq = xfrm_get_acqseq(); 2615 struct xfrm_user_acquire *ua; 2616 struct nlmsghdr *nlh; 2617 int err; 2618 2619 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0); 2620 if (nlh == NULL) 2621 return -EMSGSIZE; 2622 2623 ua = nlmsg_data(nlh); 2624 memcpy(&ua->id, &x->id, sizeof(ua->id)); 2625 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr)); 2626 memcpy(&ua->sel, &x->sel, sizeof(ua->sel)); 2627 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT); 2628 ua->aalgos = xt->aalgos; 2629 ua->ealgos = xt->ealgos; 2630 ua->calgos = xt->calgos; 2631 ua->seq = x->km.seq = seq; 2632 2633 err = copy_to_user_tmpl(xp, skb); 2634 if (!err) 2635 err = copy_to_user_state_sec_ctx(x, skb); 2636 if (!err) 2637 err = copy_to_user_policy_type(xp->type, skb); 2638 if (!err) 2639 err = xfrm_mark_put(skb, &xp->mark); 2640 if (err) { 2641 nlmsg_cancel(skb, nlh); 2642 return err; 2643 } 2644 2645 return nlmsg_end(skb, nlh); 2646 } 2647 2648 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt, 2649 struct xfrm_policy *xp) 2650 { 2651 struct net *net = xs_net(x); 2652 struct sk_buff *skb; 2653 2654 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC); 2655 if (skb == NULL) 2656 return -ENOMEM; 2657 2658 if (build_acquire(skb, x, xt, xp) < 0) 2659 BUG(); 2660 2661 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC); 2662 } 2663 2664 /* User gives us xfrm_user_policy_info followed by an array of 0 2665 * or more templates. 2666 */ 2667 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt, 2668 u8 *data, int len, int *dir) 2669 { 2670 struct net *net = sock_net(sk); 2671 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data; 2672 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1); 2673 struct xfrm_policy *xp; 2674 int nr; 2675 2676 switch (sk->sk_family) { 2677 case AF_INET: 2678 if (opt != IP_XFRM_POLICY) { 2679 *dir = -EOPNOTSUPP; 2680 return NULL; 2681 } 2682 break; 2683 #if IS_ENABLED(CONFIG_IPV6) 2684 case AF_INET6: 2685 if (opt != IPV6_XFRM_POLICY) { 2686 *dir = -EOPNOTSUPP; 2687 return NULL; 2688 } 2689 break; 2690 #endif 2691 default: 2692 *dir = -EINVAL; 2693 return NULL; 2694 } 2695 2696 *dir = -EINVAL; 2697 2698 if (len < sizeof(*p) || 2699 verify_newpolicy_info(p)) 2700 return NULL; 2701 2702 nr = ((len - sizeof(*p)) / sizeof(*ut)); 2703 if (validate_tmpl(nr, ut, p->sel.family)) 2704 return NULL; 2705 2706 if (p->dir > XFRM_POLICY_OUT) 2707 return NULL; 2708 2709 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 2710 if (xp == NULL) { 2711 *dir = -ENOBUFS; 2712 return NULL; 2713 } 2714 2715 copy_from_user_policy(xp, p); 2716 xp->type = XFRM_POLICY_TYPE_MAIN; 2717 copy_templates(xp, ut, nr); 2718 2719 *dir = p->dir; 2720 2721 return xp; 2722 } 2723 2724 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp) 2725 { 2726 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire)) 2727 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 2728 + nla_total_size(xfrm_user_sec_ctx_size(xp->security)) 2729 + nla_total_size(sizeof(struct xfrm_mark)) 2730 + userpolicy_type_attrsize(); 2731 } 2732 2733 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp, 2734 int dir, const struct km_event *c) 2735 { 2736 struct xfrm_user_polexpire *upe; 2737 int hard = c->data.hard; 2738 struct nlmsghdr *nlh; 2739 int err; 2740 2741 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0); 2742 if (nlh == NULL) 2743 return -EMSGSIZE; 2744 2745 upe = nlmsg_data(nlh); 2746 copy_to_user_policy(xp, &upe->pol, dir); 2747 err = copy_to_user_tmpl(xp, skb); 2748 if (!err) 2749 err = copy_to_user_sec_ctx(xp, skb); 2750 if (!err) 2751 err = copy_to_user_policy_type(xp->type, skb); 2752 if (!err) 2753 err = xfrm_mark_put(skb, &xp->mark); 2754 if (err) { 2755 nlmsg_cancel(skb, nlh); 2756 return err; 2757 } 2758 upe->hard = !!hard; 2759 2760 return nlmsg_end(skb, nlh); 2761 } 2762 2763 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 2764 { 2765 struct net *net = xp_net(xp); 2766 struct sk_buff *skb; 2767 2768 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC); 2769 if (skb == NULL) 2770 return -ENOMEM; 2771 2772 if (build_polexpire(skb, xp, dir, c) < 0) 2773 BUG(); 2774 2775 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC); 2776 } 2777 2778 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) 2779 { 2780 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); 2781 struct net *net = xp_net(xp); 2782 struct xfrm_userpolicy_info *p; 2783 struct xfrm_userpolicy_id *id; 2784 struct nlmsghdr *nlh; 2785 struct sk_buff *skb; 2786 int headlen, err; 2787 2788 headlen = sizeof(*p); 2789 if (c->event == XFRM_MSG_DELPOLICY) { 2790 len += nla_total_size(headlen); 2791 headlen = sizeof(*id); 2792 } 2793 len += userpolicy_type_attrsize(); 2794 len += nla_total_size(sizeof(struct xfrm_mark)); 2795 len += NLMSG_ALIGN(headlen); 2796 2797 skb = nlmsg_new(len, GFP_ATOMIC); 2798 if (skb == NULL) 2799 return -ENOMEM; 2800 2801 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); 2802 err = -EMSGSIZE; 2803 if (nlh == NULL) 2804 goto out_free_skb; 2805 2806 p = nlmsg_data(nlh); 2807 if (c->event == XFRM_MSG_DELPOLICY) { 2808 struct nlattr *attr; 2809 2810 id = nlmsg_data(nlh); 2811 memset(id, 0, sizeof(*id)); 2812 id->dir = dir; 2813 if (c->data.byid) 2814 id->index = xp->index; 2815 else 2816 memcpy(&id->sel, &xp->selector, sizeof(id->sel)); 2817 2818 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p)); 2819 err = -EMSGSIZE; 2820 if (attr == NULL) 2821 goto out_free_skb; 2822 2823 p = nla_data(attr); 2824 } 2825 2826 copy_to_user_policy(xp, p, dir); 2827 err = copy_to_user_tmpl(xp, skb); 2828 if (!err) 2829 err = copy_to_user_policy_type(xp->type, skb); 2830 if (!err) 2831 err = xfrm_mark_put(skb, &xp->mark); 2832 if (err) 2833 goto out_free_skb; 2834 2835 nlmsg_end(skb, nlh); 2836 2837 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC); 2838 2839 out_free_skb: 2840 kfree_skb(skb); 2841 return err; 2842 } 2843 2844 static int xfrm_notify_policy_flush(const struct km_event *c) 2845 { 2846 struct net *net = c->net; 2847 struct nlmsghdr *nlh; 2848 struct sk_buff *skb; 2849 int err; 2850 2851 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC); 2852 if (skb == NULL) 2853 return -ENOMEM; 2854 2855 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0); 2856 err = -EMSGSIZE; 2857 if (nlh == NULL) 2858 goto out_free_skb; 2859 err = copy_to_user_policy_type(c->data.type, skb); 2860 if (err) 2861 goto out_free_skb; 2862 2863 nlmsg_end(skb, nlh); 2864 2865 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC); 2866 2867 out_free_skb: 2868 kfree_skb(skb); 2869 return err; 2870 } 2871 2872 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 2873 { 2874 2875 switch (c->event) { 2876 case XFRM_MSG_NEWPOLICY: 2877 case XFRM_MSG_UPDPOLICY: 2878 case XFRM_MSG_DELPOLICY: 2879 return xfrm_notify_policy(xp, dir, c); 2880 case XFRM_MSG_FLUSHPOLICY: 2881 return xfrm_notify_policy_flush(c); 2882 case XFRM_MSG_POLEXPIRE: 2883 return xfrm_exp_policy_notify(xp, dir, c); 2884 default: 2885 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n", 2886 c->event); 2887 } 2888 2889 return 0; 2890 2891 } 2892 2893 static inline size_t xfrm_report_msgsize(void) 2894 { 2895 return NLMSG_ALIGN(sizeof(struct xfrm_user_report)); 2896 } 2897 2898 static int build_report(struct sk_buff *skb, u8 proto, 2899 struct xfrm_selector *sel, xfrm_address_t *addr) 2900 { 2901 struct xfrm_user_report *ur; 2902 struct nlmsghdr *nlh; 2903 2904 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0); 2905 if (nlh == NULL) 2906 return -EMSGSIZE; 2907 2908 ur = nlmsg_data(nlh); 2909 ur->proto = proto; 2910 memcpy(&ur->sel, sel, sizeof(ur->sel)); 2911 2912 if (addr) { 2913 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr); 2914 if (err) { 2915 nlmsg_cancel(skb, nlh); 2916 return err; 2917 } 2918 } 2919 return nlmsg_end(skb, nlh); 2920 } 2921 2922 static int xfrm_send_report(struct net *net, u8 proto, 2923 struct xfrm_selector *sel, xfrm_address_t *addr) 2924 { 2925 struct sk_buff *skb; 2926 2927 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC); 2928 if (skb == NULL) 2929 return -ENOMEM; 2930 2931 if (build_report(skb, proto, sel, addr) < 0) 2932 BUG(); 2933 2934 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC); 2935 } 2936 2937 static inline size_t xfrm_mapping_msgsize(void) 2938 { 2939 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping)); 2940 } 2941 2942 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x, 2943 xfrm_address_t *new_saddr, __be16 new_sport) 2944 { 2945 struct xfrm_user_mapping *um; 2946 struct nlmsghdr *nlh; 2947 2948 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0); 2949 if (nlh == NULL) 2950 return -EMSGSIZE; 2951 2952 um = nlmsg_data(nlh); 2953 2954 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr)); 2955 um->id.spi = x->id.spi; 2956 um->id.family = x->props.family; 2957 um->id.proto = x->id.proto; 2958 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr)); 2959 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr)); 2960 um->new_sport = new_sport; 2961 um->old_sport = x->encap->encap_sport; 2962 um->reqid = x->props.reqid; 2963 2964 return nlmsg_end(skb, nlh); 2965 } 2966 2967 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, 2968 __be16 sport) 2969 { 2970 struct net *net = xs_net(x); 2971 struct sk_buff *skb; 2972 2973 if (x->id.proto != IPPROTO_ESP) 2974 return -EINVAL; 2975 2976 if (!x->encap) 2977 return -EINVAL; 2978 2979 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC); 2980 if (skb == NULL) 2981 return -ENOMEM; 2982 2983 if (build_mapping(skb, x, ipaddr, sport) < 0) 2984 BUG(); 2985 2986 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MAPPING, GFP_ATOMIC); 2987 } 2988 2989 static struct xfrm_mgr netlink_mgr = { 2990 .id = "netlink", 2991 .notify = xfrm_send_state_notify, 2992 .acquire = xfrm_send_acquire, 2993 .compile_policy = xfrm_compile_policy, 2994 .notify_policy = xfrm_send_policy_notify, 2995 .report = xfrm_send_report, 2996 .migrate = xfrm_send_migrate, 2997 .new_mapping = xfrm_send_mapping, 2998 }; 2999 3000 static int __net_init xfrm_user_net_init(struct net *net) 3001 { 3002 struct sock *nlsk; 3003 struct netlink_kernel_cfg cfg = { 3004 .groups = XFRMNLGRP_MAX, 3005 .input = xfrm_netlink_rcv, 3006 }; 3007 3008 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg); 3009 if (nlsk == NULL) 3010 return -ENOMEM; 3011 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */ 3012 rcu_assign_pointer(net->xfrm.nlsk, nlsk); 3013 return 0; 3014 } 3015 3016 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list) 3017 { 3018 struct net *net; 3019 list_for_each_entry(net, net_exit_list, exit_list) 3020 RCU_INIT_POINTER(net->xfrm.nlsk, NULL); 3021 synchronize_net(); 3022 list_for_each_entry(net, net_exit_list, exit_list) 3023 netlink_kernel_release(net->xfrm.nlsk_stash); 3024 } 3025 3026 static struct pernet_operations xfrm_user_net_ops = { 3027 .init = xfrm_user_net_init, 3028 .exit_batch = xfrm_user_net_exit, 3029 }; 3030 3031 static int __init xfrm_user_init(void) 3032 { 3033 int rv; 3034 3035 printk(KERN_INFO "Initializing XFRM netlink socket\n"); 3036 3037 rv = register_pernet_subsys(&xfrm_user_net_ops); 3038 if (rv < 0) 3039 return rv; 3040 rv = xfrm_register_km(&netlink_mgr); 3041 if (rv < 0) 3042 unregister_pernet_subsys(&xfrm_user_net_ops); 3043 return rv; 3044 } 3045 3046 static void __exit xfrm_user_exit(void) 3047 { 3048 xfrm_unregister_km(&netlink_mgr); 3049 unregister_pernet_subsys(&xfrm_user_net_ops); 3050 } 3051 3052 module_init(xfrm_user_init); 3053 module_exit(xfrm_user_exit); 3054 MODULE_LICENSE("GPL"); 3055 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM); 3056 3057