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