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 = min_t(unsigned int, p->replay_window, 450 sizeof(x->replay.bitmap) * 8); 451 x->props.reqid = p->reqid; 452 x->props.family = p->family; 453 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr)); 454 x->props.flags = p->flags; 455 456 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC)) 457 x->sel.family = p->family; 458 } 459 460 /* 461 * someday when pfkey also has support, we could have the code 462 * somehow made shareable and move it to xfrm_state.c - JHS 463 * 464 */ 465 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs, 466 int update_esn) 467 { 468 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 469 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL; 470 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 471 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; 472 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; 473 474 if (re) { 475 struct xfrm_replay_state_esn *replay_esn; 476 replay_esn = nla_data(re); 477 memcpy(x->replay_esn, replay_esn, 478 xfrm_replay_state_esn_len(replay_esn)); 479 memcpy(x->preplay_esn, replay_esn, 480 xfrm_replay_state_esn_len(replay_esn)); 481 } 482 483 if (rp) { 484 struct xfrm_replay_state *replay; 485 replay = nla_data(rp); 486 memcpy(&x->replay, replay, sizeof(*replay)); 487 memcpy(&x->preplay, replay, sizeof(*replay)); 488 } 489 490 if (lt) { 491 struct xfrm_lifetime_cur *ltime; 492 ltime = nla_data(lt); 493 x->curlft.bytes = ltime->bytes; 494 x->curlft.packets = ltime->packets; 495 x->curlft.add_time = ltime->add_time; 496 x->curlft.use_time = ltime->use_time; 497 } 498 499 if (et) 500 x->replay_maxage = nla_get_u32(et); 501 502 if (rt) 503 x->replay_maxdiff = nla_get_u32(rt); 504 } 505 506 static struct xfrm_state *xfrm_state_construct(struct net *net, 507 struct xfrm_usersa_info *p, 508 struct nlattr **attrs, 509 int *errp) 510 { 511 struct xfrm_state *x = xfrm_state_alloc(net); 512 int err = -ENOMEM; 513 514 if (!x) 515 goto error_no_put; 516 517 copy_from_user_state(x, p); 518 519 if (attrs[XFRMA_SA_EXTRA_FLAGS]) 520 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]); 521 522 if ((err = attach_aead(&x->aead, &x->props.ealgo, 523 attrs[XFRMA_ALG_AEAD]))) 524 goto error; 525 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo, 526 attrs[XFRMA_ALG_AUTH_TRUNC]))) 527 goto error; 528 if (!x->props.aalgo) { 529 if ((err = attach_auth(&x->aalg, &x->props.aalgo, 530 attrs[XFRMA_ALG_AUTH]))) 531 goto error; 532 } 533 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo, 534 xfrm_ealg_get_byname, 535 attrs[XFRMA_ALG_CRYPT]))) 536 goto error; 537 if ((err = attach_one_algo(&x->calg, &x->props.calgo, 538 xfrm_calg_get_byname, 539 attrs[XFRMA_ALG_COMP]))) 540 goto error; 541 542 if (attrs[XFRMA_ENCAP]) { 543 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]), 544 sizeof(*x->encap), GFP_KERNEL); 545 if (x->encap == NULL) 546 goto error; 547 } 548 549 if (attrs[XFRMA_TFCPAD]) 550 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]); 551 552 if (attrs[XFRMA_COADDR]) { 553 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]), 554 sizeof(*x->coaddr), GFP_KERNEL); 555 if (x->coaddr == NULL) 556 goto error; 557 } 558 559 xfrm_mark_get(attrs, &x->mark); 560 561 err = __xfrm_init_state(x, false); 562 if (err) 563 goto error; 564 565 if (attrs[XFRMA_SEC_CTX] && 566 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX]))) 567 goto error; 568 569 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn, 570 attrs[XFRMA_REPLAY_ESN_VAL]))) 571 goto error; 572 573 x->km.seq = p->seq; 574 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth; 575 /* sysctl_xfrm_aevent_etime is in 100ms units */ 576 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M; 577 578 if ((err = xfrm_init_replay(x))) 579 goto error; 580 581 /* override default values from above */ 582 xfrm_update_ae_params(x, attrs, 0); 583 584 return x; 585 586 error: 587 x->km.state = XFRM_STATE_DEAD; 588 xfrm_state_put(x); 589 error_no_put: 590 *errp = err; 591 return NULL; 592 } 593 594 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 595 struct nlattr **attrs) 596 { 597 struct net *net = sock_net(skb->sk); 598 struct xfrm_usersa_info *p = nlmsg_data(nlh); 599 struct xfrm_state *x; 600 int err; 601 struct km_event c; 602 kuid_t loginuid = audit_get_loginuid(current); 603 u32 sessionid = audit_get_sessionid(current); 604 u32 sid; 605 606 err = verify_newsa_info(p, attrs); 607 if (err) 608 return err; 609 610 x = xfrm_state_construct(net, p, attrs, &err); 611 if (!x) 612 return err; 613 614 xfrm_state_hold(x); 615 if (nlh->nlmsg_type == XFRM_MSG_NEWSA) 616 err = xfrm_state_add(x); 617 else 618 err = xfrm_state_update(x); 619 620 security_task_getsecid(current, &sid); 621 xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid); 622 623 if (err < 0) { 624 x->km.state = XFRM_STATE_DEAD; 625 __xfrm_state_put(x); 626 goto out; 627 } 628 629 c.seq = nlh->nlmsg_seq; 630 c.portid = nlh->nlmsg_pid; 631 c.event = nlh->nlmsg_type; 632 633 km_state_notify(x, &c); 634 out: 635 xfrm_state_put(x); 636 return err; 637 } 638 639 static struct xfrm_state *xfrm_user_state_lookup(struct net *net, 640 struct xfrm_usersa_id *p, 641 struct nlattr **attrs, 642 int *errp) 643 { 644 struct xfrm_state *x = NULL; 645 struct xfrm_mark m; 646 int err; 647 u32 mark = xfrm_mark_get(attrs, &m); 648 649 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) { 650 err = -ESRCH; 651 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family); 652 } else { 653 xfrm_address_t *saddr = NULL; 654 655 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr); 656 if (!saddr) { 657 err = -EINVAL; 658 goto out; 659 } 660 661 err = -ESRCH; 662 x = xfrm_state_lookup_byaddr(net, mark, 663 &p->daddr, saddr, 664 p->proto, p->family); 665 } 666 667 out: 668 if (!x && errp) 669 *errp = err; 670 return x; 671 } 672 673 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 674 struct nlattr **attrs) 675 { 676 struct net *net = sock_net(skb->sk); 677 struct xfrm_state *x; 678 int err = -ESRCH; 679 struct km_event c; 680 struct xfrm_usersa_id *p = nlmsg_data(nlh); 681 kuid_t loginuid = audit_get_loginuid(current); 682 u32 sessionid = audit_get_sessionid(current); 683 u32 sid; 684 685 x = xfrm_user_state_lookup(net, p, attrs, &err); 686 if (x == NULL) 687 return err; 688 689 if ((err = security_xfrm_state_delete(x)) != 0) 690 goto out; 691 692 if (xfrm_state_kern(x)) { 693 err = -EPERM; 694 goto out; 695 } 696 697 err = xfrm_state_delete(x); 698 699 if (err < 0) 700 goto out; 701 702 c.seq = nlh->nlmsg_seq; 703 c.portid = nlh->nlmsg_pid; 704 c.event = nlh->nlmsg_type; 705 km_state_notify(x, &c); 706 707 out: 708 security_task_getsecid(current, &sid); 709 xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid); 710 xfrm_state_put(x); 711 return err; 712 } 713 714 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 715 { 716 memset(p, 0, sizeof(*p)); 717 memcpy(&p->id, &x->id, sizeof(p->id)); 718 memcpy(&p->sel, &x->sel, sizeof(p->sel)); 719 memcpy(&p->lft, &x->lft, sizeof(p->lft)); 720 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft)); 721 memcpy(&p->stats, &x->stats, sizeof(p->stats)); 722 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr)); 723 p->mode = x->props.mode; 724 p->replay_window = x->props.replay_window; 725 p->reqid = x->props.reqid; 726 p->family = x->props.family; 727 p->flags = x->props.flags; 728 p->seq = x->km.seq; 729 } 730 731 struct xfrm_dump_info { 732 struct sk_buff *in_skb; 733 struct sk_buff *out_skb; 734 u32 nlmsg_seq; 735 u16 nlmsg_flags; 736 }; 737 738 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb) 739 { 740 struct xfrm_user_sec_ctx *uctx; 741 struct nlattr *attr; 742 int ctx_size = sizeof(*uctx) + s->ctx_len; 743 744 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size); 745 if (attr == NULL) 746 return -EMSGSIZE; 747 748 uctx = nla_data(attr); 749 uctx->exttype = XFRMA_SEC_CTX; 750 uctx->len = ctx_size; 751 uctx->ctx_doi = s->ctx_doi; 752 uctx->ctx_alg = s->ctx_alg; 753 uctx->ctx_len = s->ctx_len; 754 memcpy(uctx + 1, s->ctx_str, s->ctx_len); 755 756 return 0; 757 } 758 759 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb) 760 { 761 struct xfrm_algo *algo; 762 struct nlattr *nla; 763 764 nla = nla_reserve(skb, XFRMA_ALG_AUTH, 765 sizeof(*algo) + (auth->alg_key_len + 7) / 8); 766 if (!nla) 767 return -EMSGSIZE; 768 769 algo = nla_data(nla); 770 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name)); 771 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8); 772 algo->alg_key_len = auth->alg_key_len; 773 774 return 0; 775 } 776 777 /* Don't change this without updating xfrm_sa_len! */ 778 static int copy_to_user_state_extra(struct xfrm_state *x, 779 struct xfrm_usersa_info *p, 780 struct sk_buff *skb) 781 { 782 int ret = 0; 783 784 copy_to_user_state(x, p); 785 786 if (x->props.extra_flags) { 787 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS, 788 x->props.extra_flags); 789 if (ret) 790 goto out; 791 } 792 793 if (x->coaddr) { 794 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr); 795 if (ret) 796 goto out; 797 } 798 if (x->lastused) { 799 ret = nla_put_u64(skb, XFRMA_LASTUSED, x->lastused); 800 if (ret) 801 goto out; 802 } 803 if (x->aead) { 804 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead); 805 if (ret) 806 goto out; 807 } 808 if (x->aalg) { 809 ret = copy_to_user_auth(x->aalg, skb); 810 if (!ret) 811 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC, 812 xfrm_alg_auth_len(x->aalg), x->aalg); 813 if (ret) 814 goto out; 815 } 816 if (x->ealg) { 817 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg); 818 if (ret) 819 goto out; 820 } 821 if (x->calg) { 822 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg); 823 if (ret) 824 goto out; 825 } 826 if (x->encap) { 827 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap); 828 if (ret) 829 goto out; 830 } 831 if (x->tfcpad) { 832 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad); 833 if (ret) 834 goto out; 835 } 836 ret = xfrm_mark_put(skb, &x->mark); 837 if (ret) 838 goto out; 839 if (x->replay_esn) { 840 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL, 841 xfrm_replay_state_esn_len(x->replay_esn), 842 x->replay_esn); 843 if (ret) 844 goto out; 845 } 846 if (x->security) 847 ret = copy_sec_ctx(x->security, skb); 848 out: 849 return ret; 850 } 851 852 static int dump_one_state(struct xfrm_state *x, int count, void *ptr) 853 { 854 struct xfrm_dump_info *sp = ptr; 855 struct sk_buff *in_skb = sp->in_skb; 856 struct sk_buff *skb = sp->out_skb; 857 struct xfrm_usersa_info *p; 858 struct nlmsghdr *nlh; 859 int err; 860 861 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, 862 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags); 863 if (nlh == NULL) 864 return -EMSGSIZE; 865 866 p = nlmsg_data(nlh); 867 868 err = copy_to_user_state_extra(x, p, skb); 869 if (err) { 870 nlmsg_cancel(skb, nlh); 871 return err; 872 } 873 nlmsg_end(skb, nlh); 874 return 0; 875 } 876 877 static int xfrm_dump_sa_done(struct netlink_callback *cb) 878 { 879 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 880 xfrm_state_walk_done(walk); 881 return 0; 882 } 883 884 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb) 885 { 886 struct net *net = sock_net(skb->sk); 887 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 888 struct xfrm_dump_info info; 889 890 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) > 891 sizeof(cb->args) - sizeof(cb->args[0])); 892 893 info.in_skb = cb->skb; 894 info.out_skb = skb; 895 info.nlmsg_seq = cb->nlh->nlmsg_seq; 896 info.nlmsg_flags = NLM_F_MULTI; 897 898 if (!cb->args[0]) { 899 cb->args[0] = 1; 900 xfrm_state_walk_init(walk, 0); 901 } 902 903 (void) xfrm_state_walk(net, walk, dump_one_state, &info); 904 905 return skb->len; 906 } 907 908 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb, 909 struct xfrm_state *x, u32 seq) 910 { 911 struct xfrm_dump_info info; 912 struct sk_buff *skb; 913 int err; 914 915 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 916 if (!skb) 917 return ERR_PTR(-ENOMEM); 918 919 info.in_skb = in_skb; 920 info.out_skb = skb; 921 info.nlmsg_seq = seq; 922 info.nlmsg_flags = 0; 923 924 err = dump_one_state(x, 0, &info); 925 if (err) { 926 kfree_skb(skb); 927 return ERR_PTR(err); 928 } 929 930 return skb; 931 } 932 933 static inline size_t xfrm_spdinfo_msgsize(void) 934 { 935 return NLMSG_ALIGN(4) 936 + nla_total_size(sizeof(struct xfrmu_spdinfo)) 937 + nla_total_size(sizeof(struct xfrmu_spdhinfo)); 938 } 939 940 static int build_spdinfo(struct sk_buff *skb, struct net *net, 941 u32 portid, u32 seq, u32 flags) 942 { 943 struct xfrmk_spdinfo si; 944 struct xfrmu_spdinfo spc; 945 struct xfrmu_spdhinfo sph; 946 struct nlmsghdr *nlh; 947 int err; 948 u32 *f; 949 950 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0); 951 if (nlh == NULL) /* shouldn't really happen ... */ 952 return -EMSGSIZE; 953 954 f = nlmsg_data(nlh); 955 *f = flags; 956 xfrm_spd_getinfo(net, &si); 957 spc.incnt = si.incnt; 958 spc.outcnt = si.outcnt; 959 spc.fwdcnt = si.fwdcnt; 960 spc.inscnt = si.inscnt; 961 spc.outscnt = si.outscnt; 962 spc.fwdscnt = si.fwdscnt; 963 sph.spdhcnt = si.spdhcnt; 964 sph.spdhmcnt = si.spdhmcnt; 965 966 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc); 967 if (!err) 968 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph); 969 if (err) { 970 nlmsg_cancel(skb, nlh); 971 return err; 972 } 973 974 return nlmsg_end(skb, nlh); 975 } 976 977 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 978 struct nlattr **attrs) 979 { 980 struct net *net = sock_net(skb->sk); 981 struct sk_buff *r_skb; 982 u32 *flags = nlmsg_data(nlh); 983 u32 sportid = NETLINK_CB(skb).portid; 984 u32 seq = nlh->nlmsg_seq; 985 986 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC); 987 if (r_skb == NULL) 988 return -ENOMEM; 989 990 if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0) 991 BUG(); 992 993 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); 994 } 995 996 static inline size_t xfrm_sadinfo_msgsize(void) 997 { 998 return NLMSG_ALIGN(4) 999 + nla_total_size(sizeof(struct xfrmu_sadhinfo)) 1000 + nla_total_size(4); /* XFRMA_SAD_CNT */ 1001 } 1002 1003 static int build_sadinfo(struct sk_buff *skb, struct net *net, 1004 u32 portid, u32 seq, u32 flags) 1005 { 1006 struct xfrmk_sadinfo si; 1007 struct xfrmu_sadhinfo sh; 1008 struct nlmsghdr *nlh; 1009 int err; 1010 u32 *f; 1011 1012 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0); 1013 if (nlh == NULL) /* shouldn't really happen ... */ 1014 return -EMSGSIZE; 1015 1016 f = nlmsg_data(nlh); 1017 *f = flags; 1018 xfrm_sad_getinfo(net, &si); 1019 1020 sh.sadhmcnt = si.sadhmcnt; 1021 sh.sadhcnt = si.sadhcnt; 1022 1023 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt); 1024 if (!err) 1025 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh); 1026 if (err) { 1027 nlmsg_cancel(skb, nlh); 1028 return err; 1029 } 1030 1031 return nlmsg_end(skb, nlh); 1032 } 1033 1034 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1035 struct nlattr **attrs) 1036 { 1037 struct net *net = sock_net(skb->sk); 1038 struct sk_buff *r_skb; 1039 u32 *flags = nlmsg_data(nlh); 1040 u32 sportid = NETLINK_CB(skb).portid; 1041 u32 seq = nlh->nlmsg_seq; 1042 1043 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC); 1044 if (r_skb == NULL) 1045 return -ENOMEM; 1046 1047 if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0) 1048 BUG(); 1049 1050 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); 1051 } 1052 1053 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 1054 struct nlattr **attrs) 1055 { 1056 struct net *net = sock_net(skb->sk); 1057 struct xfrm_usersa_id *p = nlmsg_data(nlh); 1058 struct xfrm_state *x; 1059 struct sk_buff *resp_skb; 1060 int err = -ESRCH; 1061 1062 x = xfrm_user_state_lookup(net, p, attrs, &err); 1063 if (x == NULL) 1064 goto out_noput; 1065 1066 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 1067 if (IS_ERR(resp_skb)) { 1068 err = PTR_ERR(resp_skb); 1069 } else { 1070 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); 1071 } 1072 xfrm_state_put(x); 1073 out_noput: 1074 return err; 1075 } 1076 1077 static int verify_userspi_info(struct xfrm_userspi_info *p) 1078 { 1079 switch (p->info.id.proto) { 1080 case IPPROTO_AH: 1081 case IPPROTO_ESP: 1082 break; 1083 1084 case IPPROTO_COMP: 1085 /* IPCOMP spi is 16-bits. */ 1086 if (p->max >= 0x10000) 1087 return -EINVAL; 1088 break; 1089 1090 default: 1091 return -EINVAL; 1092 } 1093 1094 if (p->min > p->max) 1095 return -EINVAL; 1096 1097 return 0; 1098 } 1099 1100 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, 1101 struct nlattr **attrs) 1102 { 1103 struct net *net = sock_net(skb->sk); 1104 struct xfrm_state *x; 1105 struct xfrm_userspi_info *p; 1106 struct sk_buff *resp_skb; 1107 xfrm_address_t *daddr; 1108 int family; 1109 int err; 1110 u32 mark; 1111 struct xfrm_mark m; 1112 1113 p = nlmsg_data(nlh); 1114 err = verify_userspi_info(p); 1115 if (err) 1116 goto out_noput; 1117 1118 family = p->info.family; 1119 daddr = &p->info.id.daddr; 1120 1121 x = NULL; 1122 1123 mark = xfrm_mark_get(attrs, &m); 1124 if (p->info.seq) { 1125 x = xfrm_find_acq_byseq(net, mark, p->info.seq); 1126 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) { 1127 xfrm_state_put(x); 1128 x = NULL; 1129 } 1130 } 1131 1132 if (!x) 1133 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid, 1134 p->info.id.proto, daddr, 1135 &p->info.saddr, 1, 1136 family); 1137 err = -ENOENT; 1138 if (x == NULL) 1139 goto out_noput; 1140 1141 err = xfrm_alloc_spi(x, p->min, p->max); 1142 if (err) 1143 goto out; 1144 1145 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 1146 if (IS_ERR(resp_skb)) { 1147 err = PTR_ERR(resp_skb); 1148 goto out; 1149 } 1150 1151 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); 1152 1153 out: 1154 xfrm_state_put(x); 1155 out_noput: 1156 return err; 1157 } 1158 1159 static int verify_policy_dir(u8 dir) 1160 { 1161 switch (dir) { 1162 case XFRM_POLICY_IN: 1163 case XFRM_POLICY_OUT: 1164 case XFRM_POLICY_FWD: 1165 break; 1166 1167 default: 1168 return -EINVAL; 1169 } 1170 1171 return 0; 1172 } 1173 1174 static int verify_policy_type(u8 type) 1175 { 1176 switch (type) { 1177 case XFRM_POLICY_TYPE_MAIN: 1178 #ifdef CONFIG_XFRM_SUB_POLICY 1179 case XFRM_POLICY_TYPE_SUB: 1180 #endif 1181 break; 1182 1183 default: 1184 return -EINVAL; 1185 } 1186 1187 return 0; 1188 } 1189 1190 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p) 1191 { 1192 switch (p->share) { 1193 case XFRM_SHARE_ANY: 1194 case XFRM_SHARE_SESSION: 1195 case XFRM_SHARE_USER: 1196 case XFRM_SHARE_UNIQUE: 1197 break; 1198 1199 default: 1200 return -EINVAL; 1201 } 1202 1203 switch (p->action) { 1204 case XFRM_POLICY_ALLOW: 1205 case XFRM_POLICY_BLOCK: 1206 break; 1207 1208 default: 1209 return -EINVAL; 1210 } 1211 1212 switch (p->sel.family) { 1213 case AF_INET: 1214 break; 1215 1216 case AF_INET6: 1217 #if IS_ENABLED(CONFIG_IPV6) 1218 break; 1219 #else 1220 return -EAFNOSUPPORT; 1221 #endif 1222 1223 default: 1224 return -EINVAL; 1225 } 1226 1227 return verify_policy_dir(p->dir); 1228 } 1229 1230 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs) 1231 { 1232 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1233 struct xfrm_user_sec_ctx *uctx; 1234 1235 if (!rt) 1236 return 0; 1237 1238 uctx = nla_data(rt); 1239 return security_xfrm_policy_alloc(&pol->security, uctx); 1240 } 1241 1242 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut, 1243 int nr) 1244 { 1245 int i; 1246 1247 xp->xfrm_nr = nr; 1248 for (i = 0; i < nr; i++, ut++) { 1249 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 1250 1251 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id)); 1252 memcpy(&t->saddr, &ut->saddr, 1253 sizeof(xfrm_address_t)); 1254 t->reqid = ut->reqid; 1255 t->mode = ut->mode; 1256 t->share = ut->share; 1257 t->optional = ut->optional; 1258 t->aalgos = ut->aalgos; 1259 t->ealgos = ut->ealgos; 1260 t->calgos = ut->calgos; 1261 /* If all masks are ~0, then we allow all algorithms. */ 1262 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos); 1263 t->encap_family = ut->family; 1264 } 1265 } 1266 1267 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family) 1268 { 1269 int i; 1270 1271 if (nr > XFRM_MAX_DEPTH) 1272 return -EINVAL; 1273 1274 for (i = 0; i < nr; i++) { 1275 /* We never validated the ut->family value, so many 1276 * applications simply leave it at zero. The check was 1277 * never made and ut->family was ignored because all 1278 * templates could be assumed to have the same family as 1279 * the policy itself. Now that we will have ipv4-in-ipv6 1280 * and ipv6-in-ipv4 tunnels, this is no longer true. 1281 */ 1282 if (!ut[i].family) 1283 ut[i].family = family; 1284 1285 switch (ut[i].family) { 1286 case AF_INET: 1287 break; 1288 #if IS_ENABLED(CONFIG_IPV6) 1289 case AF_INET6: 1290 break; 1291 #endif 1292 default: 1293 return -EINVAL; 1294 } 1295 } 1296 1297 return 0; 1298 } 1299 1300 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs) 1301 { 1302 struct nlattr *rt = attrs[XFRMA_TMPL]; 1303 1304 if (!rt) { 1305 pol->xfrm_nr = 0; 1306 } else { 1307 struct xfrm_user_tmpl *utmpl = nla_data(rt); 1308 int nr = nla_len(rt) / sizeof(*utmpl); 1309 int err; 1310 1311 err = validate_tmpl(nr, utmpl, pol->family); 1312 if (err) 1313 return err; 1314 1315 copy_templates(pol, utmpl, nr); 1316 } 1317 return 0; 1318 } 1319 1320 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs) 1321 { 1322 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE]; 1323 struct xfrm_userpolicy_type *upt; 1324 u8 type = XFRM_POLICY_TYPE_MAIN; 1325 int err; 1326 1327 if (rt) { 1328 upt = nla_data(rt); 1329 type = upt->type; 1330 } 1331 1332 err = verify_policy_type(type); 1333 if (err) 1334 return err; 1335 1336 *tp = type; 1337 return 0; 1338 } 1339 1340 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p) 1341 { 1342 xp->priority = p->priority; 1343 xp->index = p->index; 1344 memcpy(&xp->selector, &p->sel, sizeof(xp->selector)); 1345 memcpy(&xp->lft, &p->lft, sizeof(xp->lft)); 1346 xp->action = p->action; 1347 xp->flags = p->flags; 1348 xp->family = p->sel.family; 1349 /* XXX xp->share = p->share; */ 1350 } 1351 1352 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir) 1353 { 1354 memset(p, 0, sizeof(*p)); 1355 memcpy(&p->sel, &xp->selector, sizeof(p->sel)); 1356 memcpy(&p->lft, &xp->lft, sizeof(p->lft)); 1357 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft)); 1358 p->priority = xp->priority; 1359 p->index = xp->index; 1360 p->sel.family = xp->family; 1361 p->dir = dir; 1362 p->action = xp->action; 1363 p->flags = xp->flags; 1364 p->share = XFRM_SHARE_ANY; /* XXX xp->share */ 1365 } 1366 1367 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp) 1368 { 1369 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL); 1370 int err; 1371 1372 if (!xp) { 1373 *errp = -ENOMEM; 1374 return NULL; 1375 } 1376 1377 copy_from_user_policy(xp, p); 1378 1379 err = copy_from_user_policy_type(&xp->type, attrs); 1380 if (err) 1381 goto error; 1382 1383 if (!(err = copy_from_user_tmpl(xp, attrs))) 1384 err = copy_from_user_sec_ctx(xp, attrs); 1385 if (err) 1386 goto error; 1387 1388 xfrm_mark_get(attrs, &xp->mark); 1389 1390 return xp; 1391 error: 1392 *errp = err; 1393 xp->walk.dead = 1; 1394 xfrm_policy_destroy(xp); 1395 return NULL; 1396 } 1397 1398 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1399 struct nlattr **attrs) 1400 { 1401 struct net *net = sock_net(skb->sk); 1402 struct xfrm_userpolicy_info *p = nlmsg_data(nlh); 1403 struct xfrm_policy *xp; 1404 struct km_event c; 1405 int err; 1406 int excl; 1407 kuid_t loginuid = audit_get_loginuid(current); 1408 u32 sessionid = audit_get_sessionid(current); 1409 u32 sid; 1410 1411 err = verify_newpolicy_info(p); 1412 if (err) 1413 return err; 1414 err = verify_sec_ctx_len(attrs); 1415 if (err) 1416 return err; 1417 1418 xp = xfrm_policy_construct(net, p, attrs, &err); 1419 if (!xp) 1420 return err; 1421 1422 /* shouldn't excl be based on nlh flags?? 1423 * Aha! this is anti-netlink really i.e more pfkey derived 1424 * in netlink excl is a flag and you wouldnt need 1425 * a type XFRM_MSG_UPDPOLICY - JHS */ 1426 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY; 1427 err = xfrm_policy_insert(p->dir, xp, excl); 1428 security_task_getsecid(current, &sid); 1429 xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid); 1430 1431 if (err) { 1432 security_xfrm_policy_free(xp->security); 1433 kfree(xp); 1434 return err; 1435 } 1436 1437 c.event = nlh->nlmsg_type; 1438 c.seq = nlh->nlmsg_seq; 1439 c.portid = nlh->nlmsg_pid; 1440 km_policy_notify(xp, p->dir, &c); 1441 1442 xfrm_pol_put(xp); 1443 1444 return 0; 1445 } 1446 1447 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb) 1448 { 1449 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH]; 1450 int i; 1451 1452 if (xp->xfrm_nr == 0) 1453 return 0; 1454 1455 for (i = 0; i < xp->xfrm_nr; i++) { 1456 struct xfrm_user_tmpl *up = &vec[i]; 1457 struct xfrm_tmpl *kp = &xp->xfrm_vec[i]; 1458 1459 memset(up, 0, sizeof(*up)); 1460 memcpy(&up->id, &kp->id, sizeof(up->id)); 1461 up->family = kp->encap_family; 1462 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr)); 1463 up->reqid = kp->reqid; 1464 up->mode = kp->mode; 1465 up->share = kp->share; 1466 up->optional = kp->optional; 1467 up->aalgos = kp->aalgos; 1468 up->ealgos = kp->ealgos; 1469 up->calgos = kp->calgos; 1470 } 1471 1472 return nla_put(skb, XFRMA_TMPL, 1473 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec); 1474 } 1475 1476 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb) 1477 { 1478 if (x->security) { 1479 return copy_sec_ctx(x->security, skb); 1480 } 1481 return 0; 1482 } 1483 1484 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb) 1485 { 1486 if (xp->security) 1487 return copy_sec_ctx(xp->security, skb); 1488 return 0; 1489 } 1490 static inline size_t userpolicy_type_attrsize(void) 1491 { 1492 #ifdef CONFIG_XFRM_SUB_POLICY 1493 return nla_total_size(sizeof(struct xfrm_userpolicy_type)); 1494 #else 1495 return 0; 1496 #endif 1497 } 1498 1499 #ifdef CONFIG_XFRM_SUB_POLICY 1500 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1501 { 1502 struct xfrm_userpolicy_type upt = { 1503 .type = type, 1504 }; 1505 1506 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt); 1507 } 1508 1509 #else 1510 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1511 { 1512 return 0; 1513 } 1514 #endif 1515 1516 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr) 1517 { 1518 struct xfrm_dump_info *sp = ptr; 1519 struct xfrm_userpolicy_info *p; 1520 struct sk_buff *in_skb = sp->in_skb; 1521 struct sk_buff *skb = sp->out_skb; 1522 struct nlmsghdr *nlh; 1523 int err; 1524 1525 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, 1526 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags); 1527 if (nlh == NULL) 1528 return -EMSGSIZE; 1529 1530 p = nlmsg_data(nlh); 1531 copy_to_user_policy(xp, p, dir); 1532 err = copy_to_user_tmpl(xp, skb); 1533 if (!err) 1534 err = copy_to_user_sec_ctx(xp, skb); 1535 if (!err) 1536 err = copy_to_user_policy_type(xp->type, skb); 1537 if (!err) 1538 err = xfrm_mark_put(skb, &xp->mark); 1539 if (err) { 1540 nlmsg_cancel(skb, nlh); 1541 return err; 1542 } 1543 nlmsg_end(skb, nlh); 1544 return 0; 1545 } 1546 1547 static int xfrm_dump_policy_done(struct netlink_callback *cb) 1548 { 1549 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1]; 1550 1551 xfrm_policy_walk_done(walk); 1552 return 0; 1553 } 1554 1555 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb) 1556 { 1557 struct net *net = sock_net(skb->sk); 1558 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1]; 1559 struct xfrm_dump_info info; 1560 1561 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) > 1562 sizeof(cb->args) - sizeof(cb->args[0])); 1563 1564 info.in_skb = cb->skb; 1565 info.out_skb = skb; 1566 info.nlmsg_seq = cb->nlh->nlmsg_seq; 1567 info.nlmsg_flags = NLM_F_MULTI; 1568 1569 if (!cb->args[0]) { 1570 cb->args[0] = 1; 1571 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY); 1572 } 1573 1574 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info); 1575 1576 return skb->len; 1577 } 1578 1579 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb, 1580 struct xfrm_policy *xp, 1581 int dir, u32 seq) 1582 { 1583 struct xfrm_dump_info info; 1584 struct sk_buff *skb; 1585 int err; 1586 1587 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1588 if (!skb) 1589 return ERR_PTR(-ENOMEM); 1590 1591 info.in_skb = in_skb; 1592 info.out_skb = skb; 1593 info.nlmsg_seq = seq; 1594 info.nlmsg_flags = 0; 1595 1596 err = dump_one_policy(xp, dir, 0, &info); 1597 if (err) { 1598 kfree_skb(skb); 1599 return ERR_PTR(err); 1600 } 1601 1602 return skb; 1603 } 1604 1605 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1606 struct nlattr **attrs) 1607 { 1608 struct net *net = sock_net(skb->sk); 1609 struct xfrm_policy *xp; 1610 struct xfrm_userpolicy_id *p; 1611 u8 type = XFRM_POLICY_TYPE_MAIN; 1612 int err; 1613 struct km_event c; 1614 int delete; 1615 struct xfrm_mark m; 1616 u32 mark = xfrm_mark_get(attrs, &m); 1617 1618 p = nlmsg_data(nlh); 1619 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY; 1620 1621 err = copy_from_user_policy_type(&type, attrs); 1622 if (err) 1623 return err; 1624 1625 err = verify_policy_dir(p->dir); 1626 if (err) 1627 return err; 1628 1629 if (p->index) 1630 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err); 1631 else { 1632 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1633 struct xfrm_sec_ctx *ctx; 1634 1635 err = verify_sec_ctx_len(attrs); 1636 if (err) 1637 return err; 1638 1639 ctx = NULL; 1640 if (rt) { 1641 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 1642 1643 err = security_xfrm_policy_alloc(&ctx, uctx); 1644 if (err) 1645 return err; 1646 } 1647 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel, 1648 ctx, delete, &err); 1649 security_xfrm_policy_free(ctx); 1650 } 1651 if (xp == NULL) 1652 return -ENOENT; 1653 1654 if (!delete) { 1655 struct sk_buff *resp_skb; 1656 1657 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq); 1658 if (IS_ERR(resp_skb)) { 1659 err = PTR_ERR(resp_skb); 1660 } else { 1661 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, 1662 NETLINK_CB(skb).portid); 1663 } 1664 } else { 1665 kuid_t loginuid = audit_get_loginuid(current); 1666 u32 sessionid = audit_get_sessionid(current); 1667 u32 sid; 1668 1669 security_task_getsecid(current, &sid); 1670 xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid, 1671 sid); 1672 1673 if (err != 0) 1674 goto out; 1675 1676 c.data.byid = p->index; 1677 c.event = nlh->nlmsg_type; 1678 c.seq = nlh->nlmsg_seq; 1679 c.portid = nlh->nlmsg_pid; 1680 km_policy_notify(xp, p->dir, &c); 1681 } 1682 1683 out: 1684 xfrm_pol_put(xp); 1685 if (delete && err == 0) 1686 xfrm_garbage_collect(net); 1687 return err; 1688 } 1689 1690 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 1691 struct nlattr **attrs) 1692 { 1693 struct net *net = sock_net(skb->sk); 1694 struct km_event c; 1695 struct xfrm_usersa_flush *p = nlmsg_data(nlh); 1696 struct xfrm_audit audit_info; 1697 int err; 1698 1699 audit_info.loginuid = audit_get_loginuid(current); 1700 audit_info.sessionid = audit_get_sessionid(current); 1701 security_task_getsecid(current, &audit_info.secid); 1702 err = xfrm_state_flush(net, p->proto, &audit_info); 1703 if (err) { 1704 if (err == -ESRCH) /* empty table */ 1705 return 0; 1706 return err; 1707 } 1708 c.data.proto = p->proto; 1709 c.event = nlh->nlmsg_type; 1710 c.seq = nlh->nlmsg_seq; 1711 c.portid = nlh->nlmsg_pid; 1712 c.net = net; 1713 km_state_notify(NULL, &c); 1714 1715 return 0; 1716 } 1717 1718 static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x) 1719 { 1720 size_t replay_size = x->replay_esn ? 1721 xfrm_replay_state_esn_len(x->replay_esn) : 1722 sizeof(struct xfrm_replay_state); 1723 1724 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id)) 1725 + nla_total_size(replay_size) 1726 + nla_total_size(sizeof(struct xfrm_lifetime_cur)) 1727 + nla_total_size(sizeof(struct xfrm_mark)) 1728 + nla_total_size(4) /* XFRM_AE_RTHR */ 1729 + nla_total_size(4); /* XFRM_AE_ETHR */ 1730 } 1731 1732 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 1733 { 1734 struct xfrm_aevent_id *id; 1735 struct nlmsghdr *nlh; 1736 int err; 1737 1738 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0); 1739 if (nlh == NULL) 1740 return -EMSGSIZE; 1741 1742 id = nlmsg_data(nlh); 1743 memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr)); 1744 id->sa_id.spi = x->id.spi; 1745 id->sa_id.family = x->props.family; 1746 id->sa_id.proto = x->id.proto; 1747 memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr)); 1748 id->reqid = x->props.reqid; 1749 id->flags = c->data.aevent; 1750 1751 if (x->replay_esn) { 1752 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL, 1753 xfrm_replay_state_esn_len(x->replay_esn), 1754 x->replay_esn); 1755 } else { 1756 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), 1757 &x->replay); 1758 } 1759 if (err) 1760 goto out_cancel; 1761 err = nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft); 1762 if (err) 1763 goto out_cancel; 1764 1765 if (id->flags & XFRM_AE_RTHR) { 1766 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff); 1767 if (err) 1768 goto out_cancel; 1769 } 1770 if (id->flags & XFRM_AE_ETHR) { 1771 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH, 1772 x->replay_maxage * 10 / HZ); 1773 if (err) 1774 goto out_cancel; 1775 } 1776 err = xfrm_mark_put(skb, &x->mark); 1777 if (err) 1778 goto out_cancel; 1779 1780 return nlmsg_end(skb, nlh); 1781 1782 out_cancel: 1783 nlmsg_cancel(skb, nlh); 1784 return err; 1785 } 1786 1787 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 1788 struct nlattr **attrs) 1789 { 1790 struct net *net = sock_net(skb->sk); 1791 struct xfrm_state *x; 1792 struct sk_buff *r_skb; 1793 int err; 1794 struct km_event c; 1795 u32 mark; 1796 struct xfrm_mark m; 1797 struct xfrm_aevent_id *p = nlmsg_data(nlh); 1798 struct xfrm_usersa_id *id = &p->sa_id; 1799 1800 mark = xfrm_mark_get(attrs, &m); 1801 1802 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family); 1803 if (x == NULL) 1804 return -ESRCH; 1805 1806 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 1807 if (r_skb == NULL) { 1808 xfrm_state_put(x); 1809 return -ENOMEM; 1810 } 1811 1812 /* 1813 * XXX: is this lock really needed - none of the other 1814 * gets lock (the concern is things getting updated 1815 * while we are still reading) - jhs 1816 */ 1817 spin_lock_bh(&x->lock); 1818 c.data.aevent = p->flags; 1819 c.seq = nlh->nlmsg_seq; 1820 c.portid = nlh->nlmsg_pid; 1821 1822 if (build_aevent(r_skb, x, &c) < 0) 1823 BUG(); 1824 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid); 1825 spin_unlock_bh(&x->lock); 1826 xfrm_state_put(x); 1827 return err; 1828 } 1829 1830 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 1831 struct nlattr **attrs) 1832 { 1833 struct net *net = sock_net(skb->sk); 1834 struct xfrm_state *x; 1835 struct km_event c; 1836 int err = - EINVAL; 1837 u32 mark = 0; 1838 struct xfrm_mark m; 1839 struct xfrm_aevent_id *p = nlmsg_data(nlh); 1840 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 1841 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL]; 1842 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 1843 1844 if (!lt && !rp && !re) 1845 return err; 1846 1847 /* pedantic mode - thou shalt sayeth replaceth */ 1848 if (!(nlh->nlmsg_flags&NLM_F_REPLACE)) 1849 return err; 1850 1851 mark = xfrm_mark_get(attrs, &m); 1852 1853 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family); 1854 if (x == NULL) 1855 return -ESRCH; 1856 1857 if (x->km.state != XFRM_STATE_VALID) 1858 goto out; 1859 1860 err = xfrm_replay_verify_len(x->replay_esn, re); 1861 if (err) 1862 goto out; 1863 1864 spin_lock_bh(&x->lock); 1865 xfrm_update_ae_params(x, attrs, 1); 1866 spin_unlock_bh(&x->lock); 1867 1868 c.event = nlh->nlmsg_type; 1869 c.seq = nlh->nlmsg_seq; 1870 c.portid = nlh->nlmsg_pid; 1871 c.data.aevent = XFRM_AE_CU; 1872 km_state_notify(x, &c); 1873 err = 0; 1874 out: 1875 xfrm_state_put(x); 1876 return err; 1877 } 1878 1879 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1880 struct nlattr **attrs) 1881 { 1882 struct net *net = sock_net(skb->sk); 1883 struct km_event c; 1884 u8 type = XFRM_POLICY_TYPE_MAIN; 1885 int err; 1886 struct xfrm_audit audit_info; 1887 1888 err = copy_from_user_policy_type(&type, attrs); 1889 if (err) 1890 return err; 1891 1892 audit_info.loginuid = audit_get_loginuid(current); 1893 audit_info.sessionid = audit_get_sessionid(current); 1894 security_task_getsecid(current, &audit_info.secid); 1895 err = xfrm_policy_flush(net, type, &audit_info); 1896 if (err) { 1897 if (err == -ESRCH) /* empty table */ 1898 return 0; 1899 return err; 1900 } 1901 1902 c.data.type = type; 1903 c.event = nlh->nlmsg_type; 1904 c.seq = nlh->nlmsg_seq; 1905 c.portid = nlh->nlmsg_pid; 1906 c.net = net; 1907 km_policy_notify(NULL, 0, &c); 1908 return 0; 1909 } 1910 1911 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 1912 struct nlattr **attrs) 1913 { 1914 struct net *net = sock_net(skb->sk); 1915 struct xfrm_policy *xp; 1916 struct xfrm_user_polexpire *up = nlmsg_data(nlh); 1917 struct xfrm_userpolicy_info *p = &up->pol; 1918 u8 type = XFRM_POLICY_TYPE_MAIN; 1919 int err = -ENOENT; 1920 struct xfrm_mark m; 1921 u32 mark = xfrm_mark_get(attrs, &m); 1922 1923 err = copy_from_user_policy_type(&type, attrs); 1924 if (err) 1925 return err; 1926 1927 err = verify_policy_dir(p->dir); 1928 if (err) 1929 return err; 1930 1931 if (p->index) 1932 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err); 1933 else { 1934 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1935 struct xfrm_sec_ctx *ctx; 1936 1937 err = verify_sec_ctx_len(attrs); 1938 if (err) 1939 return err; 1940 1941 ctx = NULL; 1942 if (rt) { 1943 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 1944 1945 err = security_xfrm_policy_alloc(&ctx, uctx); 1946 if (err) 1947 return err; 1948 } 1949 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, 1950 &p->sel, ctx, 0, &err); 1951 security_xfrm_policy_free(ctx); 1952 } 1953 if (xp == NULL) 1954 return -ENOENT; 1955 1956 if (unlikely(xp->walk.dead)) 1957 goto out; 1958 1959 err = 0; 1960 if (up->hard) { 1961 kuid_t loginuid = audit_get_loginuid(current); 1962 u32 sessionid = audit_get_sessionid(current); 1963 u32 sid; 1964 1965 security_task_getsecid(current, &sid); 1966 xfrm_policy_delete(xp, p->dir); 1967 xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid); 1968 1969 } else { 1970 // reset the timers here? 1971 WARN(1, "Dont know what to do with soft policy expire\n"); 1972 } 1973 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid); 1974 1975 out: 1976 xfrm_pol_put(xp); 1977 return err; 1978 } 1979 1980 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 1981 struct nlattr **attrs) 1982 { 1983 struct net *net = sock_net(skb->sk); 1984 struct xfrm_state *x; 1985 int err; 1986 struct xfrm_user_expire *ue = nlmsg_data(nlh); 1987 struct xfrm_usersa_info *p = &ue->state; 1988 struct xfrm_mark m; 1989 u32 mark = xfrm_mark_get(attrs, &m); 1990 1991 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family); 1992 1993 err = -ENOENT; 1994 if (x == NULL) 1995 return err; 1996 1997 spin_lock_bh(&x->lock); 1998 err = -EINVAL; 1999 if (x->km.state != XFRM_STATE_VALID) 2000 goto out; 2001 km_state_expired(x, ue->hard, nlh->nlmsg_pid); 2002 2003 if (ue->hard) { 2004 kuid_t loginuid = audit_get_loginuid(current); 2005 u32 sessionid = audit_get_sessionid(current); 2006 u32 sid; 2007 2008 security_task_getsecid(current, &sid); 2009 __xfrm_state_delete(x); 2010 xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid); 2011 } 2012 err = 0; 2013 out: 2014 spin_unlock_bh(&x->lock); 2015 xfrm_state_put(x); 2016 return err; 2017 } 2018 2019 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, 2020 struct nlattr **attrs) 2021 { 2022 struct net *net = sock_net(skb->sk); 2023 struct xfrm_policy *xp; 2024 struct xfrm_user_tmpl *ut; 2025 int i; 2026 struct nlattr *rt = attrs[XFRMA_TMPL]; 2027 struct xfrm_mark mark; 2028 2029 struct xfrm_user_acquire *ua = nlmsg_data(nlh); 2030 struct xfrm_state *x = xfrm_state_alloc(net); 2031 int err = -ENOMEM; 2032 2033 if (!x) 2034 goto nomem; 2035 2036 xfrm_mark_get(attrs, &mark); 2037 2038 err = verify_newpolicy_info(&ua->policy); 2039 if (err) 2040 goto bad_policy; 2041 2042 /* build an XP */ 2043 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err); 2044 if (!xp) 2045 goto free_state; 2046 2047 memcpy(&x->id, &ua->id, sizeof(ua->id)); 2048 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr)); 2049 memcpy(&x->sel, &ua->sel, sizeof(ua->sel)); 2050 xp->mark.m = x->mark.m = mark.m; 2051 xp->mark.v = x->mark.v = mark.v; 2052 ut = nla_data(rt); 2053 /* extract the templates and for each call km_key */ 2054 for (i = 0; i < xp->xfrm_nr; i++, ut++) { 2055 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 2056 memcpy(&x->id, &t->id, sizeof(x->id)); 2057 x->props.mode = t->mode; 2058 x->props.reqid = t->reqid; 2059 x->props.family = ut->family; 2060 t->aalgos = ua->aalgos; 2061 t->ealgos = ua->ealgos; 2062 t->calgos = ua->calgos; 2063 err = km_query(x, t, xp); 2064 2065 } 2066 2067 kfree(x); 2068 kfree(xp); 2069 2070 return 0; 2071 2072 bad_policy: 2073 WARN(1, "BAD policy passed\n"); 2074 free_state: 2075 kfree(x); 2076 nomem: 2077 return err; 2078 } 2079 2080 #ifdef CONFIG_XFRM_MIGRATE 2081 static int copy_from_user_migrate(struct xfrm_migrate *ma, 2082 struct xfrm_kmaddress *k, 2083 struct nlattr **attrs, int *num) 2084 { 2085 struct nlattr *rt = attrs[XFRMA_MIGRATE]; 2086 struct xfrm_user_migrate *um; 2087 int i, num_migrate; 2088 2089 if (k != NULL) { 2090 struct xfrm_user_kmaddress *uk; 2091 2092 uk = nla_data(attrs[XFRMA_KMADDRESS]); 2093 memcpy(&k->local, &uk->local, sizeof(k->local)); 2094 memcpy(&k->remote, &uk->remote, sizeof(k->remote)); 2095 k->family = uk->family; 2096 k->reserved = uk->reserved; 2097 } 2098 2099 um = nla_data(rt); 2100 num_migrate = nla_len(rt) / sizeof(*um); 2101 2102 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH) 2103 return -EINVAL; 2104 2105 for (i = 0; i < num_migrate; i++, um++, ma++) { 2106 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr)); 2107 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr)); 2108 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr)); 2109 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr)); 2110 2111 ma->proto = um->proto; 2112 ma->mode = um->mode; 2113 ma->reqid = um->reqid; 2114 2115 ma->old_family = um->old_family; 2116 ma->new_family = um->new_family; 2117 } 2118 2119 *num = i; 2120 return 0; 2121 } 2122 2123 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 2124 struct nlattr **attrs) 2125 { 2126 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh); 2127 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 2128 struct xfrm_kmaddress km, *kmp; 2129 u8 type; 2130 int err; 2131 int n = 0; 2132 2133 if (attrs[XFRMA_MIGRATE] == NULL) 2134 return -EINVAL; 2135 2136 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL; 2137 2138 err = copy_from_user_policy_type(&type, attrs); 2139 if (err) 2140 return err; 2141 2142 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n); 2143 if (err) 2144 return err; 2145 2146 if (!n) 2147 return 0; 2148 2149 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp); 2150 2151 return 0; 2152 } 2153 #else 2154 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 2155 struct nlattr **attrs) 2156 { 2157 return -ENOPROTOOPT; 2158 } 2159 #endif 2160 2161 #ifdef CONFIG_XFRM_MIGRATE 2162 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb) 2163 { 2164 struct xfrm_user_migrate um; 2165 2166 memset(&um, 0, sizeof(um)); 2167 um.proto = m->proto; 2168 um.mode = m->mode; 2169 um.reqid = m->reqid; 2170 um.old_family = m->old_family; 2171 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr)); 2172 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr)); 2173 um.new_family = m->new_family; 2174 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr)); 2175 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr)); 2176 2177 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um); 2178 } 2179 2180 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb) 2181 { 2182 struct xfrm_user_kmaddress uk; 2183 2184 memset(&uk, 0, sizeof(uk)); 2185 uk.family = k->family; 2186 uk.reserved = k->reserved; 2187 memcpy(&uk.local, &k->local, sizeof(uk.local)); 2188 memcpy(&uk.remote, &k->remote, sizeof(uk.remote)); 2189 2190 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk); 2191 } 2192 2193 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma) 2194 { 2195 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id)) 2196 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0) 2197 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate) 2198 + userpolicy_type_attrsize(); 2199 } 2200 2201 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m, 2202 int num_migrate, const struct xfrm_kmaddress *k, 2203 const struct xfrm_selector *sel, u8 dir, u8 type) 2204 { 2205 const struct xfrm_migrate *mp; 2206 struct xfrm_userpolicy_id *pol_id; 2207 struct nlmsghdr *nlh; 2208 int i, err; 2209 2210 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0); 2211 if (nlh == NULL) 2212 return -EMSGSIZE; 2213 2214 pol_id = nlmsg_data(nlh); 2215 /* copy data from selector, dir, and type to the pol_id */ 2216 memset(pol_id, 0, sizeof(*pol_id)); 2217 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel)); 2218 pol_id->dir = dir; 2219 2220 if (k != NULL) { 2221 err = copy_to_user_kmaddress(k, skb); 2222 if (err) 2223 goto out_cancel; 2224 } 2225 err = copy_to_user_policy_type(type, skb); 2226 if (err) 2227 goto out_cancel; 2228 for (i = 0, mp = m ; i < num_migrate; i++, mp++) { 2229 err = copy_to_user_migrate(mp, skb); 2230 if (err) 2231 goto out_cancel; 2232 } 2233 2234 return nlmsg_end(skb, nlh); 2235 2236 out_cancel: 2237 nlmsg_cancel(skb, nlh); 2238 return err; 2239 } 2240 2241 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2242 const struct xfrm_migrate *m, int num_migrate, 2243 const struct xfrm_kmaddress *k) 2244 { 2245 struct net *net = &init_net; 2246 struct sk_buff *skb; 2247 2248 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC); 2249 if (skb == NULL) 2250 return -ENOMEM; 2251 2252 /* build migrate */ 2253 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0) 2254 BUG(); 2255 2256 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC); 2257 } 2258 #else 2259 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2260 const struct xfrm_migrate *m, int num_migrate, 2261 const struct xfrm_kmaddress *k) 2262 { 2263 return -ENOPROTOOPT; 2264 } 2265 #endif 2266 2267 #define XMSGSIZE(type) sizeof(struct type) 2268 2269 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = { 2270 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2271 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2272 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2273 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2274 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2275 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2276 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info), 2277 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire), 2278 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire), 2279 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2280 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2281 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire), 2282 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush), 2283 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0, 2284 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2285 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2286 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report), 2287 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2288 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32), 2289 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 2290 }; 2291 2292 #undef XMSGSIZE 2293 2294 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = { 2295 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)}, 2296 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)}, 2297 [XFRMA_LASTUSED] = { .type = NLA_U64}, 2298 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)}, 2299 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) }, 2300 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) }, 2301 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) }, 2302 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) }, 2303 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) }, 2304 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) }, 2305 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) }, 2306 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) }, 2307 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) }, 2308 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 }, 2309 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 }, 2310 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) }, 2311 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) }, 2312 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)}, 2313 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) }, 2314 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) }, 2315 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) }, 2316 [XFRMA_TFCPAD] = { .type = NLA_U32 }, 2317 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) }, 2318 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 }, 2319 }; 2320 2321 static const struct xfrm_link { 2322 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **); 2323 int (*dump)(struct sk_buff *, struct netlink_callback *); 2324 int (*done)(struct netlink_callback *); 2325 } xfrm_dispatch[XFRM_NR_MSGTYPES] = { 2326 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 2327 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa }, 2328 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa, 2329 .dump = xfrm_dump_sa, 2330 .done = xfrm_dump_sa_done }, 2331 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 2332 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy }, 2333 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy, 2334 .dump = xfrm_dump_policy, 2335 .done = xfrm_dump_policy_done }, 2336 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi }, 2337 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire }, 2338 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire }, 2339 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 2340 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 2341 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire}, 2342 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa }, 2343 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy }, 2344 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae }, 2345 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae }, 2346 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate }, 2347 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo }, 2348 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo }, 2349 }; 2350 2351 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 2352 { 2353 struct net *net = sock_net(skb->sk); 2354 struct nlattr *attrs[XFRMA_MAX+1]; 2355 const struct xfrm_link *link; 2356 int type, err; 2357 2358 type = nlh->nlmsg_type; 2359 if (type > XFRM_MSG_MAX) 2360 return -EINVAL; 2361 2362 type -= XFRM_MSG_BASE; 2363 link = &xfrm_dispatch[type]; 2364 2365 /* All operations require privileges, even GET */ 2366 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2367 return -EPERM; 2368 2369 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) || 2370 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) && 2371 (nlh->nlmsg_flags & NLM_F_DUMP)) { 2372 if (link->dump == NULL) 2373 return -EINVAL; 2374 2375 { 2376 struct netlink_dump_control c = { 2377 .dump = link->dump, 2378 .done = link->done, 2379 }; 2380 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c); 2381 } 2382 } 2383 2384 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX, 2385 xfrma_policy); 2386 if (err < 0) 2387 return err; 2388 2389 if (link->doit == NULL) 2390 return -EINVAL; 2391 2392 return link->doit(skb, nlh, attrs); 2393 } 2394 2395 static void xfrm_netlink_rcv(struct sk_buff *skb) 2396 { 2397 mutex_lock(&xfrm_cfg_mutex); 2398 netlink_rcv_skb(skb, &xfrm_user_rcv_msg); 2399 mutex_unlock(&xfrm_cfg_mutex); 2400 } 2401 2402 static inline size_t xfrm_expire_msgsize(void) 2403 { 2404 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire)) 2405 + nla_total_size(sizeof(struct xfrm_mark)); 2406 } 2407 2408 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 2409 { 2410 struct xfrm_user_expire *ue; 2411 struct nlmsghdr *nlh; 2412 int err; 2413 2414 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0); 2415 if (nlh == NULL) 2416 return -EMSGSIZE; 2417 2418 ue = nlmsg_data(nlh); 2419 copy_to_user_state(x, &ue->state); 2420 ue->hard = (c->data.hard != 0) ? 1 : 0; 2421 2422 err = xfrm_mark_put(skb, &x->mark); 2423 if (err) 2424 return err; 2425 2426 return nlmsg_end(skb, nlh); 2427 } 2428 2429 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c) 2430 { 2431 struct net *net = xs_net(x); 2432 struct sk_buff *skb; 2433 2434 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC); 2435 if (skb == NULL) 2436 return -ENOMEM; 2437 2438 if (build_expire(skb, x, c) < 0) { 2439 kfree_skb(skb); 2440 return -EMSGSIZE; 2441 } 2442 2443 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC); 2444 } 2445 2446 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c) 2447 { 2448 struct net *net = xs_net(x); 2449 struct sk_buff *skb; 2450 2451 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 2452 if (skb == NULL) 2453 return -ENOMEM; 2454 2455 if (build_aevent(skb, x, c) < 0) 2456 BUG(); 2457 2458 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC); 2459 } 2460 2461 static int xfrm_notify_sa_flush(const struct km_event *c) 2462 { 2463 struct net *net = c->net; 2464 struct xfrm_usersa_flush *p; 2465 struct nlmsghdr *nlh; 2466 struct sk_buff *skb; 2467 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush)); 2468 2469 skb = nlmsg_new(len, GFP_ATOMIC); 2470 if (skb == NULL) 2471 return -ENOMEM; 2472 2473 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0); 2474 if (nlh == NULL) { 2475 kfree_skb(skb); 2476 return -EMSGSIZE; 2477 } 2478 2479 p = nlmsg_data(nlh); 2480 p->proto = c->data.proto; 2481 2482 nlmsg_end(skb, nlh); 2483 2484 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC); 2485 } 2486 2487 static inline size_t xfrm_sa_len(struct xfrm_state *x) 2488 { 2489 size_t l = 0; 2490 if (x->aead) 2491 l += nla_total_size(aead_len(x->aead)); 2492 if (x->aalg) { 2493 l += nla_total_size(sizeof(struct xfrm_algo) + 2494 (x->aalg->alg_key_len + 7) / 8); 2495 l += nla_total_size(xfrm_alg_auth_len(x->aalg)); 2496 } 2497 if (x->ealg) 2498 l += nla_total_size(xfrm_alg_len(x->ealg)); 2499 if (x->calg) 2500 l += nla_total_size(sizeof(*x->calg)); 2501 if (x->encap) 2502 l += nla_total_size(sizeof(*x->encap)); 2503 if (x->tfcpad) 2504 l += nla_total_size(sizeof(x->tfcpad)); 2505 if (x->replay_esn) 2506 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn)); 2507 if (x->security) 2508 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) + 2509 x->security->ctx_len); 2510 if (x->coaddr) 2511 l += nla_total_size(sizeof(*x->coaddr)); 2512 if (x->props.extra_flags) 2513 l += nla_total_size(sizeof(x->props.extra_flags)); 2514 2515 /* Must count x->lastused as it may become non-zero behind our back. */ 2516 l += nla_total_size(sizeof(u64)); 2517 2518 return l; 2519 } 2520 2521 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c) 2522 { 2523 struct net *net = xs_net(x); 2524 struct xfrm_usersa_info *p; 2525 struct xfrm_usersa_id *id; 2526 struct nlmsghdr *nlh; 2527 struct sk_buff *skb; 2528 int len = xfrm_sa_len(x); 2529 int headlen, err; 2530 2531 headlen = sizeof(*p); 2532 if (c->event == XFRM_MSG_DELSA) { 2533 len += nla_total_size(headlen); 2534 headlen = sizeof(*id); 2535 len += nla_total_size(sizeof(struct xfrm_mark)); 2536 } 2537 len += NLMSG_ALIGN(headlen); 2538 2539 skb = nlmsg_new(len, GFP_ATOMIC); 2540 if (skb == NULL) 2541 return -ENOMEM; 2542 2543 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); 2544 err = -EMSGSIZE; 2545 if (nlh == NULL) 2546 goto out_free_skb; 2547 2548 p = nlmsg_data(nlh); 2549 if (c->event == XFRM_MSG_DELSA) { 2550 struct nlattr *attr; 2551 2552 id = nlmsg_data(nlh); 2553 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr)); 2554 id->spi = x->id.spi; 2555 id->family = x->props.family; 2556 id->proto = x->id.proto; 2557 2558 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p)); 2559 err = -EMSGSIZE; 2560 if (attr == NULL) 2561 goto out_free_skb; 2562 2563 p = nla_data(attr); 2564 } 2565 err = copy_to_user_state_extra(x, p, skb); 2566 if (err) 2567 goto out_free_skb; 2568 2569 nlmsg_end(skb, nlh); 2570 2571 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC); 2572 2573 out_free_skb: 2574 kfree_skb(skb); 2575 return err; 2576 } 2577 2578 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c) 2579 { 2580 2581 switch (c->event) { 2582 case XFRM_MSG_EXPIRE: 2583 return xfrm_exp_state_notify(x, c); 2584 case XFRM_MSG_NEWAE: 2585 return xfrm_aevent_state_notify(x, c); 2586 case XFRM_MSG_DELSA: 2587 case XFRM_MSG_UPDSA: 2588 case XFRM_MSG_NEWSA: 2589 return xfrm_notify_sa(x, c); 2590 case XFRM_MSG_FLUSHSA: 2591 return xfrm_notify_sa_flush(c); 2592 default: 2593 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n", 2594 c->event); 2595 break; 2596 } 2597 2598 return 0; 2599 2600 } 2601 2602 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x, 2603 struct xfrm_policy *xp) 2604 { 2605 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire)) 2606 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 2607 + nla_total_size(sizeof(struct xfrm_mark)) 2608 + nla_total_size(xfrm_user_sec_ctx_size(x->security)) 2609 + userpolicy_type_attrsize(); 2610 } 2611 2612 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x, 2613 struct xfrm_tmpl *xt, struct xfrm_policy *xp) 2614 { 2615 __u32 seq = xfrm_get_acqseq(); 2616 struct xfrm_user_acquire *ua; 2617 struct nlmsghdr *nlh; 2618 int err; 2619 2620 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0); 2621 if (nlh == NULL) 2622 return -EMSGSIZE; 2623 2624 ua = nlmsg_data(nlh); 2625 memcpy(&ua->id, &x->id, sizeof(ua->id)); 2626 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr)); 2627 memcpy(&ua->sel, &x->sel, sizeof(ua->sel)); 2628 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT); 2629 ua->aalgos = xt->aalgos; 2630 ua->ealgos = xt->ealgos; 2631 ua->calgos = xt->calgos; 2632 ua->seq = x->km.seq = seq; 2633 2634 err = copy_to_user_tmpl(xp, skb); 2635 if (!err) 2636 err = copy_to_user_state_sec_ctx(x, skb); 2637 if (!err) 2638 err = copy_to_user_policy_type(xp->type, skb); 2639 if (!err) 2640 err = xfrm_mark_put(skb, &xp->mark); 2641 if (err) { 2642 nlmsg_cancel(skb, nlh); 2643 return err; 2644 } 2645 2646 return nlmsg_end(skb, nlh); 2647 } 2648 2649 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt, 2650 struct xfrm_policy *xp) 2651 { 2652 struct net *net = xs_net(x); 2653 struct sk_buff *skb; 2654 2655 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC); 2656 if (skb == NULL) 2657 return -ENOMEM; 2658 2659 if (build_acquire(skb, x, xt, xp) < 0) 2660 BUG(); 2661 2662 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC); 2663 } 2664 2665 /* User gives us xfrm_user_policy_info followed by an array of 0 2666 * or more templates. 2667 */ 2668 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt, 2669 u8 *data, int len, int *dir) 2670 { 2671 struct net *net = sock_net(sk); 2672 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data; 2673 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1); 2674 struct xfrm_policy *xp; 2675 int nr; 2676 2677 switch (sk->sk_family) { 2678 case AF_INET: 2679 if (opt != IP_XFRM_POLICY) { 2680 *dir = -EOPNOTSUPP; 2681 return NULL; 2682 } 2683 break; 2684 #if IS_ENABLED(CONFIG_IPV6) 2685 case AF_INET6: 2686 if (opt != IPV6_XFRM_POLICY) { 2687 *dir = -EOPNOTSUPP; 2688 return NULL; 2689 } 2690 break; 2691 #endif 2692 default: 2693 *dir = -EINVAL; 2694 return NULL; 2695 } 2696 2697 *dir = -EINVAL; 2698 2699 if (len < sizeof(*p) || 2700 verify_newpolicy_info(p)) 2701 return NULL; 2702 2703 nr = ((len - sizeof(*p)) / sizeof(*ut)); 2704 if (validate_tmpl(nr, ut, p->sel.family)) 2705 return NULL; 2706 2707 if (p->dir > XFRM_POLICY_OUT) 2708 return NULL; 2709 2710 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 2711 if (xp == NULL) { 2712 *dir = -ENOBUFS; 2713 return NULL; 2714 } 2715 2716 copy_from_user_policy(xp, p); 2717 xp->type = XFRM_POLICY_TYPE_MAIN; 2718 copy_templates(xp, ut, nr); 2719 2720 *dir = p->dir; 2721 2722 return xp; 2723 } 2724 2725 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp) 2726 { 2727 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire)) 2728 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 2729 + nla_total_size(xfrm_user_sec_ctx_size(xp->security)) 2730 + nla_total_size(sizeof(struct xfrm_mark)) 2731 + userpolicy_type_attrsize(); 2732 } 2733 2734 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp, 2735 int dir, const struct km_event *c) 2736 { 2737 struct xfrm_user_polexpire *upe; 2738 int hard = c->data.hard; 2739 struct nlmsghdr *nlh; 2740 int err; 2741 2742 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0); 2743 if (nlh == NULL) 2744 return -EMSGSIZE; 2745 2746 upe = nlmsg_data(nlh); 2747 copy_to_user_policy(xp, &upe->pol, dir); 2748 err = copy_to_user_tmpl(xp, skb); 2749 if (!err) 2750 err = copy_to_user_sec_ctx(xp, skb); 2751 if (!err) 2752 err = copy_to_user_policy_type(xp->type, skb); 2753 if (!err) 2754 err = xfrm_mark_put(skb, &xp->mark); 2755 if (err) { 2756 nlmsg_cancel(skb, nlh); 2757 return err; 2758 } 2759 upe->hard = !!hard; 2760 2761 return nlmsg_end(skb, nlh); 2762 } 2763 2764 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 2765 { 2766 struct net *net = xp_net(xp); 2767 struct sk_buff *skb; 2768 2769 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC); 2770 if (skb == NULL) 2771 return -ENOMEM; 2772 2773 if (build_polexpire(skb, xp, dir, c) < 0) 2774 BUG(); 2775 2776 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC); 2777 } 2778 2779 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) 2780 { 2781 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); 2782 struct net *net = xp_net(xp); 2783 struct xfrm_userpolicy_info *p; 2784 struct xfrm_userpolicy_id *id; 2785 struct nlmsghdr *nlh; 2786 struct sk_buff *skb; 2787 int headlen, err; 2788 2789 headlen = sizeof(*p); 2790 if (c->event == XFRM_MSG_DELPOLICY) { 2791 len += nla_total_size(headlen); 2792 headlen = sizeof(*id); 2793 } 2794 len += userpolicy_type_attrsize(); 2795 len += nla_total_size(sizeof(struct xfrm_mark)); 2796 len += NLMSG_ALIGN(headlen); 2797 2798 skb = nlmsg_new(len, GFP_ATOMIC); 2799 if (skb == NULL) 2800 return -ENOMEM; 2801 2802 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); 2803 err = -EMSGSIZE; 2804 if (nlh == NULL) 2805 goto out_free_skb; 2806 2807 p = nlmsg_data(nlh); 2808 if (c->event == XFRM_MSG_DELPOLICY) { 2809 struct nlattr *attr; 2810 2811 id = nlmsg_data(nlh); 2812 memset(id, 0, sizeof(*id)); 2813 id->dir = dir; 2814 if (c->data.byid) 2815 id->index = xp->index; 2816 else 2817 memcpy(&id->sel, &xp->selector, sizeof(id->sel)); 2818 2819 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p)); 2820 err = -EMSGSIZE; 2821 if (attr == NULL) 2822 goto out_free_skb; 2823 2824 p = nla_data(attr); 2825 } 2826 2827 copy_to_user_policy(xp, p, dir); 2828 err = copy_to_user_tmpl(xp, skb); 2829 if (!err) 2830 err = copy_to_user_policy_type(xp->type, skb); 2831 if (!err) 2832 err = xfrm_mark_put(skb, &xp->mark); 2833 if (err) 2834 goto out_free_skb; 2835 2836 nlmsg_end(skb, nlh); 2837 2838 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC); 2839 2840 out_free_skb: 2841 kfree_skb(skb); 2842 return err; 2843 } 2844 2845 static int xfrm_notify_policy_flush(const struct km_event *c) 2846 { 2847 struct net *net = c->net; 2848 struct nlmsghdr *nlh; 2849 struct sk_buff *skb; 2850 int err; 2851 2852 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC); 2853 if (skb == NULL) 2854 return -ENOMEM; 2855 2856 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0); 2857 err = -EMSGSIZE; 2858 if (nlh == NULL) 2859 goto out_free_skb; 2860 err = copy_to_user_policy_type(c->data.type, skb); 2861 if (err) 2862 goto out_free_skb; 2863 2864 nlmsg_end(skb, nlh); 2865 2866 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC); 2867 2868 out_free_skb: 2869 kfree_skb(skb); 2870 return err; 2871 } 2872 2873 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 2874 { 2875 2876 switch (c->event) { 2877 case XFRM_MSG_NEWPOLICY: 2878 case XFRM_MSG_UPDPOLICY: 2879 case XFRM_MSG_DELPOLICY: 2880 return xfrm_notify_policy(xp, dir, c); 2881 case XFRM_MSG_FLUSHPOLICY: 2882 return xfrm_notify_policy_flush(c); 2883 case XFRM_MSG_POLEXPIRE: 2884 return xfrm_exp_policy_notify(xp, dir, c); 2885 default: 2886 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n", 2887 c->event); 2888 } 2889 2890 return 0; 2891 2892 } 2893 2894 static inline size_t xfrm_report_msgsize(void) 2895 { 2896 return NLMSG_ALIGN(sizeof(struct xfrm_user_report)); 2897 } 2898 2899 static int build_report(struct sk_buff *skb, u8 proto, 2900 struct xfrm_selector *sel, xfrm_address_t *addr) 2901 { 2902 struct xfrm_user_report *ur; 2903 struct nlmsghdr *nlh; 2904 2905 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0); 2906 if (nlh == NULL) 2907 return -EMSGSIZE; 2908 2909 ur = nlmsg_data(nlh); 2910 ur->proto = proto; 2911 memcpy(&ur->sel, sel, sizeof(ur->sel)); 2912 2913 if (addr) { 2914 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr); 2915 if (err) { 2916 nlmsg_cancel(skb, nlh); 2917 return err; 2918 } 2919 } 2920 return nlmsg_end(skb, nlh); 2921 } 2922 2923 static int xfrm_send_report(struct net *net, u8 proto, 2924 struct xfrm_selector *sel, xfrm_address_t *addr) 2925 { 2926 struct sk_buff *skb; 2927 2928 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC); 2929 if (skb == NULL) 2930 return -ENOMEM; 2931 2932 if (build_report(skb, proto, sel, addr) < 0) 2933 BUG(); 2934 2935 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC); 2936 } 2937 2938 static inline size_t xfrm_mapping_msgsize(void) 2939 { 2940 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping)); 2941 } 2942 2943 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x, 2944 xfrm_address_t *new_saddr, __be16 new_sport) 2945 { 2946 struct xfrm_user_mapping *um; 2947 struct nlmsghdr *nlh; 2948 2949 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0); 2950 if (nlh == NULL) 2951 return -EMSGSIZE; 2952 2953 um = nlmsg_data(nlh); 2954 2955 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr)); 2956 um->id.spi = x->id.spi; 2957 um->id.family = x->props.family; 2958 um->id.proto = x->id.proto; 2959 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr)); 2960 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr)); 2961 um->new_sport = new_sport; 2962 um->old_sport = x->encap->encap_sport; 2963 um->reqid = x->props.reqid; 2964 2965 return nlmsg_end(skb, nlh); 2966 } 2967 2968 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, 2969 __be16 sport) 2970 { 2971 struct net *net = xs_net(x); 2972 struct sk_buff *skb; 2973 2974 if (x->id.proto != IPPROTO_ESP) 2975 return -EINVAL; 2976 2977 if (!x->encap) 2978 return -EINVAL; 2979 2980 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC); 2981 if (skb == NULL) 2982 return -ENOMEM; 2983 2984 if (build_mapping(skb, x, ipaddr, sport) < 0) 2985 BUG(); 2986 2987 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MAPPING, GFP_ATOMIC); 2988 } 2989 2990 static struct xfrm_mgr netlink_mgr = { 2991 .id = "netlink", 2992 .notify = xfrm_send_state_notify, 2993 .acquire = xfrm_send_acquire, 2994 .compile_policy = xfrm_compile_policy, 2995 .notify_policy = xfrm_send_policy_notify, 2996 .report = xfrm_send_report, 2997 .migrate = xfrm_send_migrate, 2998 .new_mapping = xfrm_send_mapping, 2999 }; 3000 3001 static int __net_init xfrm_user_net_init(struct net *net) 3002 { 3003 struct sock *nlsk; 3004 struct netlink_kernel_cfg cfg = { 3005 .groups = XFRMNLGRP_MAX, 3006 .input = xfrm_netlink_rcv, 3007 }; 3008 3009 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg); 3010 if (nlsk == NULL) 3011 return -ENOMEM; 3012 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */ 3013 rcu_assign_pointer(net->xfrm.nlsk, nlsk); 3014 return 0; 3015 } 3016 3017 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list) 3018 { 3019 struct net *net; 3020 list_for_each_entry(net, net_exit_list, exit_list) 3021 RCU_INIT_POINTER(net->xfrm.nlsk, NULL); 3022 synchronize_net(); 3023 list_for_each_entry(net, net_exit_list, exit_list) 3024 netlink_kernel_release(net->xfrm.nlsk_stash); 3025 } 3026 3027 static struct pernet_operations xfrm_user_net_ops = { 3028 .init = xfrm_user_net_init, 3029 .exit_batch = xfrm_user_net_exit, 3030 }; 3031 3032 static int __init xfrm_user_init(void) 3033 { 3034 int rv; 3035 3036 printk(KERN_INFO "Initializing XFRM netlink socket\n"); 3037 3038 rv = register_pernet_subsys(&xfrm_user_net_ops); 3039 if (rv < 0) 3040 return rv; 3041 rv = xfrm_register_km(&netlink_mgr); 3042 if (rv < 0) 3043 unregister_pernet_subsys(&xfrm_user_net_ops); 3044 return rv; 3045 } 3046 3047 static void __exit xfrm_user_exit(void) 3048 { 3049 xfrm_unregister_km(&netlink_mgr); 3050 unregister_pernet_subsys(&xfrm_user_net_ops); 3051 } 3052 3053 module_init(xfrm_user_init); 3054 module_exit(xfrm_user_exit); 3055 MODULE_LICENSE("GPL"); 3056 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM); 3057 3058