1 /* xfrm_user.c: User interface to configure xfrm engine. 2 * 3 * Copyright (C) 2002 David S. Miller (davem@redhat.com) 4 * 5 * Changes: 6 * Mitsuru KANDA @USAGI 7 * Kazunori MIYAZAWA @USAGI 8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com> 9 * IPv6 support 10 * 11 */ 12 13 #include <linux/crypto.h> 14 #include <linux/module.h> 15 #include <linux/kernel.h> 16 #include <linux/types.h> 17 #include <linux/slab.h> 18 #include <linux/socket.h> 19 #include <linux/string.h> 20 #include <linux/net.h> 21 #include <linux/skbuff.h> 22 #include <linux/pfkeyv2.h> 23 #include <linux/ipsec.h> 24 #include <linux/init.h> 25 #include <linux/security.h> 26 #include <net/sock.h> 27 #include <net/xfrm.h> 28 #include <net/netlink.h> 29 #include <net/ah.h> 30 #include <asm/uaccess.h> 31 #if IS_ENABLED(CONFIG_IPV6) 32 #include <linux/in6.h> 33 #endif 34 35 static inline int aead_len(struct xfrm_algo_aead *alg) 36 { 37 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 38 } 39 40 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type) 41 { 42 struct nlattr *rt = attrs[type]; 43 struct xfrm_algo *algp; 44 45 if (!rt) 46 return 0; 47 48 algp = nla_data(rt); 49 if (nla_len(rt) < xfrm_alg_len(algp)) 50 return -EINVAL; 51 52 switch (type) { 53 case XFRMA_ALG_AUTH: 54 case XFRMA_ALG_CRYPT: 55 case XFRMA_ALG_COMP: 56 break; 57 58 default: 59 return -EINVAL; 60 } 61 62 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; 63 return 0; 64 } 65 66 static int verify_auth_trunc(struct nlattr **attrs) 67 { 68 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC]; 69 struct xfrm_algo_auth *algp; 70 71 if (!rt) 72 return 0; 73 74 algp = nla_data(rt); 75 if (nla_len(rt) < xfrm_alg_auth_len(algp)) 76 return -EINVAL; 77 78 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; 79 return 0; 80 } 81 82 static int verify_aead(struct nlattr **attrs) 83 { 84 struct nlattr *rt = attrs[XFRMA_ALG_AEAD]; 85 struct xfrm_algo_aead *algp; 86 87 if (!rt) 88 return 0; 89 90 algp = nla_data(rt); 91 if (nla_len(rt) < aead_len(algp)) 92 return -EINVAL; 93 94 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; 95 return 0; 96 } 97 98 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type, 99 xfrm_address_t **addrp) 100 { 101 struct nlattr *rt = attrs[type]; 102 103 if (rt && addrp) 104 *addrp = nla_data(rt); 105 } 106 107 static inline int verify_sec_ctx_len(struct nlattr **attrs) 108 { 109 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 110 struct xfrm_user_sec_ctx *uctx; 111 112 if (!rt) 113 return 0; 114 115 uctx = nla_data(rt); 116 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len)) 117 return -EINVAL; 118 119 return 0; 120 } 121 122 static inline int verify_replay(struct xfrm_usersa_info *p, 123 struct nlattr **attrs) 124 { 125 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL]; 126 127 if ((p->flags & XFRM_STATE_ESN) && !rt) 128 return -EINVAL; 129 130 if (!rt) 131 return 0; 132 133 if (p->id.proto != IPPROTO_ESP) 134 return -EINVAL; 135 136 if (p->replay_window != 0) 137 return -EINVAL; 138 139 return 0; 140 } 141 142 static int verify_newsa_info(struct xfrm_usersa_info *p, 143 struct nlattr **attrs) 144 { 145 int err; 146 147 err = -EINVAL; 148 switch (p->family) { 149 case AF_INET: 150 break; 151 152 case AF_INET6: 153 #if IS_ENABLED(CONFIG_IPV6) 154 break; 155 #else 156 err = -EAFNOSUPPORT; 157 goto out; 158 #endif 159 160 default: 161 goto out; 162 } 163 164 err = -EINVAL; 165 switch (p->id.proto) { 166 case IPPROTO_AH: 167 if ((!attrs[XFRMA_ALG_AUTH] && 168 !attrs[XFRMA_ALG_AUTH_TRUNC]) || 169 attrs[XFRMA_ALG_AEAD] || 170 attrs[XFRMA_ALG_CRYPT] || 171 attrs[XFRMA_ALG_COMP] || 172 attrs[XFRMA_TFCPAD]) 173 goto out; 174 break; 175 176 case IPPROTO_ESP: 177 if (attrs[XFRMA_ALG_COMP]) 178 goto out; 179 if (!attrs[XFRMA_ALG_AUTH] && 180 !attrs[XFRMA_ALG_AUTH_TRUNC] && 181 !attrs[XFRMA_ALG_CRYPT] && 182 !attrs[XFRMA_ALG_AEAD]) 183 goto out; 184 if ((attrs[XFRMA_ALG_AUTH] || 185 attrs[XFRMA_ALG_AUTH_TRUNC] || 186 attrs[XFRMA_ALG_CRYPT]) && 187 attrs[XFRMA_ALG_AEAD]) 188 goto out; 189 if (attrs[XFRMA_TFCPAD] && 190 p->mode != XFRM_MODE_TUNNEL) 191 goto out; 192 break; 193 194 case IPPROTO_COMP: 195 if (!attrs[XFRMA_ALG_COMP] || 196 attrs[XFRMA_ALG_AEAD] || 197 attrs[XFRMA_ALG_AUTH] || 198 attrs[XFRMA_ALG_AUTH_TRUNC] || 199 attrs[XFRMA_ALG_CRYPT] || 200 attrs[XFRMA_TFCPAD]) 201 goto out; 202 break; 203 204 #if IS_ENABLED(CONFIG_IPV6) 205 case IPPROTO_DSTOPTS: 206 case IPPROTO_ROUTING: 207 if (attrs[XFRMA_ALG_COMP] || 208 attrs[XFRMA_ALG_AUTH] || 209 attrs[XFRMA_ALG_AUTH_TRUNC] || 210 attrs[XFRMA_ALG_AEAD] || 211 attrs[XFRMA_ALG_CRYPT] || 212 attrs[XFRMA_ENCAP] || 213 attrs[XFRMA_SEC_CTX] || 214 attrs[XFRMA_TFCPAD] || 215 !attrs[XFRMA_COADDR]) 216 goto out; 217 break; 218 #endif 219 220 default: 221 goto out; 222 } 223 224 if ((err = verify_aead(attrs))) 225 goto out; 226 if ((err = verify_auth_trunc(attrs))) 227 goto out; 228 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH))) 229 goto out; 230 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT))) 231 goto out; 232 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP))) 233 goto out; 234 if ((err = verify_sec_ctx_len(attrs))) 235 goto out; 236 if ((err = verify_replay(p, attrs))) 237 goto out; 238 239 err = -EINVAL; 240 switch (p->mode) { 241 case XFRM_MODE_TRANSPORT: 242 case XFRM_MODE_TUNNEL: 243 case XFRM_MODE_ROUTEOPTIMIZATION: 244 case XFRM_MODE_BEET: 245 break; 246 247 default: 248 goto out; 249 } 250 251 err = 0; 252 253 out: 254 return err; 255 } 256 257 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props, 258 struct xfrm_algo_desc *(*get_byname)(const char *, int), 259 struct nlattr *rta) 260 { 261 struct xfrm_algo *p, *ualg; 262 struct xfrm_algo_desc *algo; 263 264 if (!rta) 265 return 0; 266 267 ualg = nla_data(rta); 268 269 algo = get_byname(ualg->alg_name, 1); 270 if (!algo) 271 return -ENOSYS; 272 *props = algo->desc.sadb_alg_id; 273 274 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL); 275 if (!p) 276 return -ENOMEM; 277 278 strcpy(p->alg_name, algo->name); 279 *algpp = p; 280 return 0; 281 } 282 283 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props, 284 struct nlattr *rta) 285 { 286 struct xfrm_algo *ualg; 287 struct xfrm_algo_auth *p; 288 struct xfrm_algo_desc *algo; 289 290 if (!rta) 291 return 0; 292 293 ualg = nla_data(rta); 294 295 algo = xfrm_aalg_get_byname(ualg->alg_name, 1); 296 if (!algo) 297 return -ENOSYS; 298 *props = algo->desc.sadb_alg_id; 299 300 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL); 301 if (!p) 302 return -ENOMEM; 303 304 strcpy(p->alg_name, algo->name); 305 p->alg_key_len = ualg->alg_key_len; 306 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; 307 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8); 308 309 *algpp = p; 310 return 0; 311 } 312 313 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props, 314 struct nlattr *rta) 315 { 316 struct xfrm_algo_auth *p, *ualg; 317 struct xfrm_algo_desc *algo; 318 319 if (!rta) 320 return 0; 321 322 ualg = nla_data(rta); 323 324 algo = xfrm_aalg_get_byname(ualg->alg_name, 1); 325 if (!algo) 326 return -ENOSYS; 327 if ((ualg->alg_trunc_len / 8) > MAX_AH_AUTH_LEN || 328 ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits) 329 return -EINVAL; 330 *props = algo->desc.sadb_alg_id; 331 332 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL); 333 if (!p) 334 return -ENOMEM; 335 336 strcpy(p->alg_name, algo->name); 337 if (!p->alg_trunc_len) 338 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; 339 340 *algpp = p; 341 return 0; 342 } 343 344 static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props, 345 struct nlattr *rta) 346 { 347 struct xfrm_algo_aead *p, *ualg; 348 struct xfrm_algo_desc *algo; 349 350 if (!rta) 351 return 0; 352 353 ualg = nla_data(rta); 354 355 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1); 356 if (!algo) 357 return -ENOSYS; 358 *props = algo->desc.sadb_alg_id; 359 360 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL); 361 if (!p) 362 return -ENOMEM; 363 364 strcpy(p->alg_name, algo->name); 365 *algpp = p; 366 return 0; 367 } 368 369 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn, 370 struct nlattr *rp) 371 { 372 struct xfrm_replay_state_esn *up; 373 374 if (!replay_esn || !rp) 375 return 0; 376 377 up = nla_data(rp); 378 379 if (xfrm_replay_state_esn_len(replay_esn) != 380 xfrm_replay_state_esn_len(up)) 381 return -EINVAL; 382 383 return 0; 384 } 385 386 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn, 387 struct xfrm_replay_state_esn **preplay_esn, 388 struct nlattr *rta) 389 { 390 struct xfrm_replay_state_esn *p, *pp, *up; 391 392 if (!rta) 393 return 0; 394 395 up = nla_data(rta); 396 397 p = kmemdup(up, xfrm_replay_state_esn_len(up), GFP_KERNEL); 398 if (!p) 399 return -ENOMEM; 400 401 pp = kmemdup(up, xfrm_replay_state_esn_len(up), GFP_KERNEL); 402 if (!pp) { 403 kfree(p); 404 return -ENOMEM; 405 } 406 407 *replay_esn = p; 408 *preplay_esn = pp; 409 410 return 0; 411 } 412 413 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx) 414 { 415 int len = 0; 416 417 if (xfrm_ctx) { 418 len += sizeof(struct xfrm_user_sec_ctx); 419 len += xfrm_ctx->ctx_len; 420 } 421 return len; 422 } 423 424 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 425 { 426 memcpy(&x->id, &p->id, sizeof(x->id)); 427 memcpy(&x->sel, &p->sel, sizeof(x->sel)); 428 memcpy(&x->lft, &p->lft, sizeof(x->lft)); 429 x->props.mode = p->mode; 430 x->props.replay_window = p->replay_window; 431 x->props.reqid = p->reqid; 432 x->props.family = p->family; 433 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr)); 434 x->props.flags = p->flags; 435 436 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC)) 437 x->sel.family = p->family; 438 } 439 440 /* 441 * someday when pfkey also has support, we could have the code 442 * somehow made shareable and move it to xfrm_state.c - JHS 443 * 444 */ 445 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs) 446 { 447 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 448 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL]; 449 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 450 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; 451 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; 452 453 if (re) { 454 struct xfrm_replay_state_esn *replay_esn; 455 replay_esn = nla_data(re); 456 memcpy(x->replay_esn, replay_esn, 457 xfrm_replay_state_esn_len(replay_esn)); 458 memcpy(x->preplay_esn, replay_esn, 459 xfrm_replay_state_esn_len(replay_esn)); 460 } 461 462 if (rp) { 463 struct xfrm_replay_state *replay; 464 replay = nla_data(rp); 465 memcpy(&x->replay, replay, sizeof(*replay)); 466 memcpy(&x->preplay, replay, sizeof(*replay)); 467 } 468 469 if (lt) { 470 struct xfrm_lifetime_cur *ltime; 471 ltime = nla_data(lt); 472 x->curlft.bytes = ltime->bytes; 473 x->curlft.packets = ltime->packets; 474 x->curlft.add_time = ltime->add_time; 475 x->curlft.use_time = ltime->use_time; 476 } 477 478 if (et) 479 x->replay_maxage = nla_get_u32(et); 480 481 if (rt) 482 x->replay_maxdiff = nla_get_u32(rt); 483 } 484 485 static struct xfrm_state *xfrm_state_construct(struct net *net, 486 struct xfrm_usersa_info *p, 487 struct nlattr **attrs, 488 int *errp) 489 { 490 struct xfrm_state *x = xfrm_state_alloc(net); 491 int err = -ENOMEM; 492 493 if (!x) 494 goto error_no_put; 495 496 copy_from_user_state(x, p); 497 498 if ((err = attach_aead(&x->aead, &x->props.ealgo, 499 attrs[XFRMA_ALG_AEAD]))) 500 goto error; 501 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo, 502 attrs[XFRMA_ALG_AUTH_TRUNC]))) 503 goto error; 504 if (!x->props.aalgo) { 505 if ((err = attach_auth(&x->aalg, &x->props.aalgo, 506 attrs[XFRMA_ALG_AUTH]))) 507 goto error; 508 } 509 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo, 510 xfrm_ealg_get_byname, 511 attrs[XFRMA_ALG_CRYPT]))) 512 goto error; 513 if ((err = attach_one_algo(&x->calg, &x->props.calgo, 514 xfrm_calg_get_byname, 515 attrs[XFRMA_ALG_COMP]))) 516 goto error; 517 518 if (attrs[XFRMA_ENCAP]) { 519 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]), 520 sizeof(*x->encap), GFP_KERNEL); 521 if (x->encap == NULL) 522 goto error; 523 } 524 525 if (attrs[XFRMA_TFCPAD]) 526 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]); 527 528 if (attrs[XFRMA_COADDR]) { 529 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]), 530 sizeof(*x->coaddr), GFP_KERNEL); 531 if (x->coaddr == NULL) 532 goto error; 533 } 534 535 xfrm_mark_get(attrs, &x->mark); 536 537 err = __xfrm_init_state(x, false); 538 if (err) 539 goto error; 540 541 if (attrs[XFRMA_SEC_CTX] && 542 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX]))) 543 goto error; 544 545 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn, 546 attrs[XFRMA_REPLAY_ESN_VAL]))) 547 goto error; 548 549 x->km.seq = p->seq; 550 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth; 551 /* sysctl_xfrm_aevent_etime is in 100ms units */ 552 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M; 553 554 if ((err = xfrm_init_replay(x))) 555 goto error; 556 557 /* override default values from above */ 558 xfrm_update_ae_params(x, attrs); 559 560 return x; 561 562 error: 563 x->km.state = XFRM_STATE_DEAD; 564 xfrm_state_put(x); 565 error_no_put: 566 *errp = err; 567 return NULL; 568 } 569 570 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 571 struct nlattr **attrs) 572 { 573 struct net *net = sock_net(skb->sk); 574 struct xfrm_usersa_info *p = nlmsg_data(nlh); 575 struct xfrm_state *x; 576 int err; 577 struct km_event c; 578 uid_t loginuid = audit_get_loginuid(current); 579 u32 sessionid = audit_get_sessionid(current); 580 u32 sid; 581 582 err = verify_newsa_info(p, attrs); 583 if (err) 584 return err; 585 586 x = xfrm_state_construct(net, p, attrs, &err); 587 if (!x) 588 return err; 589 590 xfrm_state_hold(x); 591 if (nlh->nlmsg_type == XFRM_MSG_NEWSA) 592 err = xfrm_state_add(x); 593 else 594 err = xfrm_state_update(x); 595 596 security_task_getsecid(current, &sid); 597 xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid); 598 599 if (err < 0) { 600 x->km.state = XFRM_STATE_DEAD; 601 __xfrm_state_put(x); 602 goto out; 603 } 604 605 c.seq = nlh->nlmsg_seq; 606 c.pid = nlh->nlmsg_pid; 607 c.event = nlh->nlmsg_type; 608 609 km_state_notify(x, &c); 610 out: 611 xfrm_state_put(x); 612 return err; 613 } 614 615 static struct xfrm_state *xfrm_user_state_lookup(struct net *net, 616 struct xfrm_usersa_id *p, 617 struct nlattr **attrs, 618 int *errp) 619 { 620 struct xfrm_state *x = NULL; 621 struct xfrm_mark m; 622 int err; 623 u32 mark = xfrm_mark_get(attrs, &m); 624 625 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) { 626 err = -ESRCH; 627 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family); 628 } else { 629 xfrm_address_t *saddr = NULL; 630 631 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr); 632 if (!saddr) { 633 err = -EINVAL; 634 goto out; 635 } 636 637 err = -ESRCH; 638 x = xfrm_state_lookup_byaddr(net, mark, 639 &p->daddr, saddr, 640 p->proto, p->family); 641 } 642 643 out: 644 if (!x && errp) 645 *errp = err; 646 return x; 647 } 648 649 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 650 struct nlattr **attrs) 651 { 652 struct net *net = sock_net(skb->sk); 653 struct xfrm_state *x; 654 int err = -ESRCH; 655 struct km_event c; 656 struct xfrm_usersa_id *p = nlmsg_data(nlh); 657 uid_t loginuid = audit_get_loginuid(current); 658 u32 sessionid = audit_get_sessionid(current); 659 u32 sid; 660 661 x = xfrm_user_state_lookup(net, p, attrs, &err); 662 if (x == NULL) 663 return err; 664 665 if ((err = security_xfrm_state_delete(x)) != 0) 666 goto out; 667 668 if (xfrm_state_kern(x)) { 669 err = -EPERM; 670 goto out; 671 } 672 673 err = xfrm_state_delete(x); 674 675 if (err < 0) 676 goto out; 677 678 c.seq = nlh->nlmsg_seq; 679 c.pid = nlh->nlmsg_pid; 680 c.event = nlh->nlmsg_type; 681 km_state_notify(x, &c); 682 683 out: 684 security_task_getsecid(current, &sid); 685 xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid); 686 xfrm_state_put(x); 687 return err; 688 } 689 690 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 691 { 692 memset(p, 0, sizeof(*p)); 693 memcpy(&p->id, &x->id, sizeof(p->id)); 694 memcpy(&p->sel, &x->sel, sizeof(p->sel)); 695 memcpy(&p->lft, &x->lft, sizeof(p->lft)); 696 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft)); 697 memcpy(&p->stats, &x->stats, sizeof(p->stats)); 698 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr)); 699 p->mode = x->props.mode; 700 p->replay_window = x->props.replay_window; 701 p->reqid = x->props.reqid; 702 p->family = x->props.family; 703 p->flags = x->props.flags; 704 p->seq = x->km.seq; 705 } 706 707 struct xfrm_dump_info { 708 struct sk_buff *in_skb; 709 struct sk_buff *out_skb; 710 u32 nlmsg_seq; 711 u16 nlmsg_flags; 712 }; 713 714 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb) 715 { 716 struct xfrm_user_sec_ctx *uctx; 717 struct nlattr *attr; 718 int ctx_size = sizeof(*uctx) + s->ctx_len; 719 720 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size); 721 if (attr == NULL) 722 return -EMSGSIZE; 723 724 uctx = nla_data(attr); 725 uctx->exttype = XFRMA_SEC_CTX; 726 uctx->len = ctx_size; 727 uctx->ctx_doi = s->ctx_doi; 728 uctx->ctx_alg = s->ctx_alg; 729 uctx->ctx_len = s->ctx_len; 730 memcpy(uctx + 1, s->ctx_str, s->ctx_len); 731 732 return 0; 733 } 734 735 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb) 736 { 737 struct xfrm_algo *algo; 738 struct nlattr *nla; 739 740 nla = nla_reserve(skb, XFRMA_ALG_AUTH, 741 sizeof(*algo) + (auth->alg_key_len + 7) / 8); 742 if (!nla) 743 return -EMSGSIZE; 744 745 algo = nla_data(nla); 746 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name)); 747 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8); 748 algo->alg_key_len = auth->alg_key_len; 749 750 return 0; 751 } 752 753 /* Don't change this without updating xfrm_sa_len! */ 754 static int copy_to_user_state_extra(struct xfrm_state *x, 755 struct xfrm_usersa_info *p, 756 struct sk_buff *skb) 757 { 758 int ret = 0; 759 760 copy_to_user_state(x, p); 761 762 if (x->coaddr) { 763 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr); 764 if (ret) 765 goto out; 766 } 767 if (x->lastused) { 768 ret = nla_put_u64(skb, XFRMA_LASTUSED, x->lastused); 769 if (ret) 770 goto out; 771 } 772 if (x->aead) { 773 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead); 774 if (ret) 775 goto out; 776 } 777 if (x->aalg) { 778 ret = copy_to_user_auth(x->aalg, skb); 779 if (!ret) 780 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC, 781 xfrm_alg_auth_len(x->aalg), x->aalg); 782 if (ret) 783 goto out; 784 } 785 if (x->ealg) { 786 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg); 787 if (ret) 788 goto out; 789 } 790 if (x->calg) { 791 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg); 792 if (ret) 793 goto out; 794 } 795 if (x->encap) { 796 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap); 797 if (ret) 798 goto out; 799 } 800 if (x->tfcpad) { 801 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad); 802 if (ret) 803 goto out; 804 } 805 ret = xfrm_mark_put(skb, &x->mark); 806 if (ret) 807 goto out; 808 if (x->replay_esn) { 809 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL, 810 xfrm_replay_state_esn_len(x->replay_esn), 811 x->replay_esn); 812 if (ret) 813 goto out; 814 } 815 if (x->security) 816 ret = copy_sec_ctx(x->security, skb); 817 out: 818 return ret; 819 } 820 821 static int dump_one_state(struct xfrm_state *x, int count, void *ptr) 822 { 823 struct xfrm_dump_info *sp = ptr; 824 struct sk_buff *in_skb = sp->in_skb; 825 struct sk_buff *skb = sp->out_skb; 826 struct xfrm_usersa_info *p; 827 struct nlmsghdr *nlh; 828 int err; 829 830 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq, 831 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags); 832 if (nlh == NULL) 833 return -EMSGSIZE; 834 835 p = nlmsg_data(nlh); 836 837 err = copy_to_user_state_extra(x, p, skb); 838 if (err) { 839 nlmsg_cancel(skb, nlh); 840 return err; 841 } 842 nlmsg_end(skb, nlh); 843 return 0; 844 } 845 846 static int xfrm_dump_sa_done(struct netlink_callback *cb) 847 { 848 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 849 xfrm_state_walk_done(walk); 850 return 0; 851 } 852 853 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb) 854 { 855 struct net *net = sock_net(skb->sk); 856 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 857 struct xfrm_dump_info info; 858 859 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) > 860 sizeof(cb->args) - sizeof(cb->args[0])); 861 862 info.in_skb = cb->skb; 863 info.out_skb = skb; 864 info.nlmsg_seq = cb->nlh->nlmsg_seq; 865 info.nlmsg_flags = NLM_F_MULTI; 866 867 if (!cb->args[0]) { 868 cb->args[0] = 1; 869 xfrm_state_walk_init(walk, 0); 870 } 871 872 (void) xfrm_state_walk(net, walk, dump_one_state, &info); 873 874 return skb->len; 875 } 876 877 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb, 878 struct xfrm_state *x, u32 seq) 879 { 880 struct xfrm_dump_info info; 881 struct sk_buff *skb; 882 int err; 883 884 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 885 if (!skb) 886 return ERR_PTR(-ENOMEM); 887 888 info.in_skb = in_skb; 889 info.out_skb = skb; 890 info.nlmsg_seq = seq; 891 info.nlmsg_flags = 0; 892 893 err = dump_one_state(x, 0, &info); 894 if (err) { 895 kfree_skb(skb); 896 return ERR_PTR(err); 897 } 898 899 return skb; 900 } 901 902 static inline size_t xfrm_spdinfo_msgsize(void) 903 { 904 return NLMSG_ALIGN(4) 905 + nla_total_size(sizeof(struct xfrmu_spdinfo)) 906 + nla_total_size(sizeof(struct xfrmu_spdhinfo)); 907 } 908 909 static int build_spdinfo(struct sk_buff *skb, struct net *net, 910 u32 pid, u32 seq, u32 flags) 911 { 912 struct xfrmk_spdinfo si; 913 struct xfrmu_spdinfo spc; 914 struct xfrmu_spdhinfo sph; 915 struct nlmsghdr *nlh; 916 int err; 917 u32 *f; 918 919 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0); 920 if (nlh == NULL) /* shouldn't really happen ... */ 921 return -EMSGSIZE; 922 923 f = nlmsg_data(nlh); 924 *f = flags; 925 xfrm_spd_getinfo(net, &si); 926 spc.incnt = si.incnt; 927 spc.outcnt = si.outcnt; 928 spc.fwdcnt = si.fwdcnt; 929 spc.inscnt = si.inscnt; 930 spc.outscnt = si.outscnt; 931 spc.fwdscnt = si.fwdscnt; 932 sph.spdhcnt = si.spdhcnt; 933 sph.spdhmcnt = si.spdhmcnt; 934 935 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc); 936 if (!err) 937 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph); 938 if (err) { 939 nlmsg_cancel(skb, nlh); 940 return err; 941 } 942 943 return nlmsg_end(skb, nlh); 944 } 945 946 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 947 struct nlattr **attrs) 948 { 949 struct net *net = sock_net(skb->sk); 950 struct sk_buff *r_skb; 951 u32 *flags = nlmsg_data(nlh); 952 u32 spid = NETLINK_CB(skb).pid; 953 u32 seq = nlh->nlmsg_seq; 954 955 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC); 956 if (r_skb == NULL) 957 return -ENOMEM; 958 959 if (build_spdinfo(r_skb, net, spid, seq, *flags) < 0) 960 BUG(); 961 962 return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid); 963 } 964 965 static inline size_t xfrm_sadinfo_msgsize(void) 966 { 967 return NLMSG_ALIGN(4) 968 + nla_total_size(sizeof(struct xfrmu_sadhinfo)) 969 + nla_total_size(4); /* XFRMA_SAD_CNT */ 970 } 971 972 static int build_sadinfo(struct sk_buff *skb, struct net *net, 973 u32 pid, u32 seq, u32 flags) 974 { 975 struct xfrmk_sadinfo si; 976 struct xfrmu_sadhinfo sh; 977 struct nlmsghdr *nlh; 978 int err; 979 u32 *f; 980 981 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0); 982 if (nlh == NULL) /* shouldn't really happen ... */ 983 return -EMSGSIZE; 984 985 f = nlmsg_data(nlh); 986 *f = flags; 987 xfrm_sad_getinfo(net, &si); 988 989 sh.sadhmcnt = si.sadhmcnt; 990 sh.sadhcnt = si.sadhcnt; 991 992 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt); 993 if (!err) 994 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh); 995 if (err) { 996 nlmsg_cancel(skb, nlh); 997 return err; 998 } 999 1000 return nlmsg_end(skb, nlh); 1001 } 1002 1003 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1004 struct nlattr **attrs) 1005 { 1006 struct net *net = sock_net(skb->sk); 1007 struct sk_buff *r_skb; 1008 u32 *flags = nlmsg_data(nlh); 1009 u32 spid = NETLINK_CB(skb).pid; 1010 u32 seq = nlh->nlmsg_seq; 1011 1012 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC); 1013 if (r_skb == NULL) 1014 return -ENOMEM; 1015 1016 if (build_sadinfo(r_skb, net, spid, seq, *flags) < 0) 1017 BUG(); 1018 1019 return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid); 1020 } 1021 1022 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 1023 struct nlattr **attrs) 1024 { 1025 struct net *net = sock_net(skb->sk); 1026 struct xfrm_usersa_id *p = nlmsg_data(nlh); 1027 struct xfrm_state *x; 1028 struct sk_buff *resp_skb; 1029 int err = -ESRCH; 1030 1031 x = xfrm_user_state_lookup(net, p, attrs, &err); 1032 if (x == NULL) 1033 goto out_noput; 1034 1035 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 1036 if (IS_ERR(resp_skb)) { 1037 err = PTR_ERR(resp_skb); 1038 } else { 1039 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid); 1040 } 1041 xfrm_state_put(x); 1042 out_noput: 1043 return err; 1044 } 1045 1046 static int verify_userspi_info(struct xfrm_userspi_info *p) 1047 { 1048 switch (p->info.id.proto) { 1049 case IPPROTO_AH: 1050 case IPPROTO_ESP: 1051 break; 1052 1053 case IPPROTO_COMP: 1054 /* IPCOMP spi is 16-bits. */ 1055 if (p->max >= 0x10000) 1056 return -EINVAL; 1057 break; 1058 1059 default: 1060 return -EINVAL; 1061 } 1062 1063 if (p->min > p->max) 1064 return -EINVAL; 1065 1066 return 0; 1067 } 1068 1069 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, 1070 struct nlattr **attrs) 1071 { 1072 struct net *net = sock_net(skb->sk); 1073 struct xfrm_state *x; 1074 struct xfrm_userspi_info *p; 1075 struct sk_buff *resp_skb; 1076 xfrm_address_t *daddr; 1077 int family; 1078 int err; 1079 u32 mark; 1080 struct xfrm_mark m; 1081 1082 p = nlmsg_data(nlh); 1083 err = verify_userspi_info(p); 1084 if (err) 1085 goto out_noput; 1086 1087 family = p->info.family; 1088 daddr = &p->info.id.daddr; 1089 1090 x = NULL; 1091 1092 mark = xfrm_mark_get(attrs, &m); 1093 if (p->info.seq) { 1094 x = xfrm_find_acq_byseq(net, mark, p->info.seq); 1095 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) { 1096 xfrm_state_put(x); 1097 x = NULL; 1098 } 1099 } 1100 1101 if (!x) 1102 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid, 1103 p->info.id.proto, daddr, 1104 &p->info.saddr, 1, 1105 family); 1106 err = -ENOENT; 1107 if (x == NULL) 1108 goto out_noput; 1109 1110 err = xfrm_alloc_spi(x, p->min, p->max); 1111 if (err) 1112 goto out; 1113 1114 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 1115 if (IS_ERR(resp_skb)) { 1116 err = PTR_ERR(resp_skb); 1117 goto out; 1118 } 1119 1120 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid); 1121 1122 out: 1123 xfrm_state_put(x); 1124 out_noput: 1125 return err; 1126 } 1127 1128 static int verify_policy_dir(u8 dir) 1129 { 1130 switch (dir) { 1131 case XFRM_POLICY_IN: 1132 case XFRM_POLICY_OUT: 1133 case XFRM_POLICY_FWD: 1134 break; 1135 1136 default: 1137 return -EINVAL; 1138 } 1139 1140 return 0; 1141 } 1142 1143 static int verify_policy_type(u8 type) 1144 { 1145 switch (type) { 1146 case XFRM_POLICY_TYPE_MAIN: 1147 #ifdef CONFIG_XFRM_SUB_POLICY 1148 case XFRM_POLICY_TYPE_SUB: 1149 #endif 1150 break; 1151 1152 default: 1153 return -EINVAL; 1154 } 1155 1156 return 0; 1157 } 1158 1159 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p) 1160 { 1161 switch (p->share) { 1162 case XFRM_SHARE_ANY: 1163 case XFRM_SHARE_SESSION: 1164 case XFRM_SHARE_USER: 1165 case XFRM_SHARE_UNIQUE: 1166 break; 1167 1168 default: 1169 return -EINVAL; 1170 } 1171 1172 switch (p->action) { 1173 case XFRM_POLICY_ALLOW: 1174 case XFRM_POLICY_BLOCK: 1175 break; 1176 1177 default: 1178 return -EINVAL; 1179 } 1180 1181 switch (p->sel.family) { 1182 case AF_INET: 1183 break; 1184 1185 case AF_INET6: 1186 #if IS_ENABLED(CONFIG_IPV6) 1187 break; 1188 #else 1189 return -EAFNOSUPPORT; 1190 #endif 1191 1192 default: 1193 return -EINVAL; 1194 } 1195 1196 return verify_policy_dir(p->dir); 1197 } 1198 1199 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs) 1200 { 1201 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1202 struct xfrm_user_sec_ctx *uctx; 1203 1204 if (!rt) 1205 return 0; 1206 1207 uctx = nla_data(rt); 1208 return security_xfrm_policy_alloc(&pol->security, uctx); 1209 } 1210 1211 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut, 1212 int nr) 1213 { 1214 int i; 1215 1216 xp->xfrm_nr = nr; 1217 for (i = 0; i < nr; i++, ut++) { 1218 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 1219 1220 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id)); 1221 memcpy(&t->saddr, &ut->saddr, 1222 sizeof(xfrm_address_t)); 1223 t->reqid = ut->reqid; 1224 t->mode = ut->mode; 1225 t->share = ut->share; 1226 t->optional = ut->optional; 1227 t->aalgos = ut->aalgos; 1228 t->ealgos = ut->ealgos; 1229 t->calgos = ut->calgos; 1230 /* If all masks are ~0, then we allow all algorithms. */ 1231 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos); 1232 t->encap_family = ut->family; 1233 } 1234 } 1235 1236 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family) 1237 { 1238 int i; 1239 1240 if (nr > XFRM_MAX_DEPTH) 1241 return -EINVAL; 1242 1243 for (i = 0; i < nr; i++) { 1244 /* We never validated the ut->family value, so many 1245 * applications simply leave it at zero. The check was 1246 * never made and ut->family was ignored because all 1247 * templates could be assumed to have the same family as 1248 * the policy itself. Now that we will have ipv4-in-ipv6 1249 * and ipv6-in-ipv4 tunnels, this is no longer true. 1250 */ 1251 if (!ut[i].family) 1252 ut[i].family = family; 1253 1254 switch (ut[i].family) { 1255 case AF_INET: 1256 break; 1257 #if IS_ENABLED(CONFIG_IPV6) 1258 case AF_INET6: 1259 break; 1260 #endif 1261 default: 1262 return -EINVAL; 1263 } 1264 } 1265 1266 return 0; 1267 } 1268 1269 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs) 1270 { 1271 struct nlattr *rt = attrs[XFRMA_TMPL]; 1272 1273 if (!rt) { 1274 pol->xfrm_nr = 0; 1275 } else { 1276 struct xfrm_user_tmpl *utmpl = nla_data(rt); 1277 int nr = nla_len(rt) / sizeof(*utmpl); 1278 int err; 1279 1280 err = validate_tmpl(nr, utmpl, pol->family); 1281 if (err) 1282 return err; 1283 1284 copy_templates(pol, utmpl, nr); 1285 } 1286 return 0; 1287 } 1288 1289 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs) 1290 { 1291 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE]; 1292 struct xfrm_userpolicy_type *upt; 1293 u8 type = XFRM_POLICY_TYPE_MAIN; 1294 int err; 1295 1296 if (rt) { 1297 upt = nla_data(rt); 1298 type = upt->type; 1299 } 1300 1301 err = verify_policy_type(type); 1302 if (err) 1303 return err; 1304 1305 *tp = type; 1306 return 0; 1307 } 1308 1309 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p) 1310 { 1311 xp->priority = p->priority; 1312 xp->index = p->index; 1313 memcpy(&xp->selector, &p->sel, sizeof(xp->selector)); 1314 memcpy(&xp->lft, &p->lft, sizeof(xp->lft)); 1315 xp->action = p->action; 1316 xp->flags = p->flags; 1317 xp->family = p->sel.family; 1318 /* XXX xp->share = p->share; */ 1319 } 1320 1321 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir) 1322 { 1323 memcpy(&p->sel, &xp->selector, sizeof(p->sel)); 1324 memcpy(&p->lft, &xp->lft, sizeof(p->lft)); 1325 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft)); 1326 p->priority = xp->priority; 1327 p->index = xp->index; 1328 p->sel.family = xp->family; 1329 p->dir = dir; 1330 p->action = xp->action; 1331 p->flags = xp->flags; 1332 p->share = XFRM_SHARE_ANY; /* XXX xp->share */ 1333 } 1334 1335 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp) 1336 { 1337 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL); 1338 int err; 1339 1340 if (!xp) { 1341 *errp = -ENOMEM; 1342 return NULL; 1343 } 1344 1345 copy_from_user_policy(xp, p); 1346 1347 err = copy_from_user_policy_type(&xp->type, attrs); 1348 if (err) 1349 goto error; 1350 1351 if (!(err = copy_from_user_tmpl(xp, attrs))) 1352 err = copy_from_user_sec_ctx(xp, attrs); 1353 if (err) 1354 goto error; 1355 1356 xfrm_mark_get(attrs, &xp->mark); 1357 1358 return xp; 1359 error: 1360 *errp = err; 1361 xp->walk.dead = 1; 1362 xfrm_policy_destroy(xp); 1363 return NULL; 1364 } 1365 1366 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1367 struct nlattr **attrs) 1368 { 1369 struct net *net = sock_net(skb->sk); 1370 struct xfrm_userpolicy_info *p = nlmsg_data(nlh); 1371 struct xfrm_policy *xp; 1372 struct km_event c; 1373 int err; 1374 int excl; 1375 uid_t loginuid = audit_get_loginuid(current); 1376 u32 sessionid = audit_get_sessionid(current); 1377 u32 sid; 1378 1379 err = verify_newpolicy_info(p); 1380 if (err) 1381 return err; 1382 err = verify_sec_ctx_len(attrs); 1383 if (err) 1384 return err; 1385 1386 xp = xfrm_policy_construct(net, p, attrs, &err); 1387 if (!xp) 1388 return err; 1389 1390 /* shouldn't excl be based on nlh flags?? 1391 * Aha! this is anti-netlink really i.e more pfkey derived 1392 * in netlink excl is a flag and you wouldnt need 1393 * a type XFRM_MSG_UPDPOLICY - JHS */ 1394 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY; 1395 err = xfrm_policy_insert(p->dir, xp, excl); 1396 security_task_getsecid(current, &sid); 1397 xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid); 1398 1399 if (err) { 1400 security_xfrm_policy_free(xp->security); 1401 kfree(xp); 1402 return err; 1403 } 1404 1405 c.event = nlh->nlmsg_type; 1406 c.seq = nlh->nlmsg_seq; 1407 c.pid = nlh->nlmsg_pid; 1408 km_policy_notify(xp, p->dir, &c); 1409 1410 xfrm_pol_put(xp); 1411 1412 return 0; 1413 } 1414 1415 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb) 1416 { 1417 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH]; 1418 int i; 1419 1420 if (xp->xfrm_nr == 0) 1421 return 0; 1422 1423 for (i = 0; i < xp->xfrm_nr; i++) { 1424 struct xfrm_user_tmpl *up = &vec[i]; 1425 struct xfrm_tmpl *kp = &xp->xfrm_vec[i]; 1426 1427 memcpy(&up->id, &kp->id, sizeof(up->id)); 1428 up->family = kp->encap_family; 1429 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr)); 1430 up->reqid = kp->reqid; 1431 up->mode = kp->mode; 1432 up->share = kp->share; 1433 up->optional = kp->optional; 1434 up->aalgos = kp->aalgos; 1435 up->ealgos = kp->ealgos; 1436 up->calgos = kp->calgos; 1437 } 1438 1439 return nla_put(skb, XFRMA_TMPL, 1440 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec); 1441 } 1442 1443 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb) 1444 { 1445 if (x->security) { 1446 return copy_sec_ctx(x->security, skb); 1447 } 1448 return 0; 1449 } 1450 1451 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb) 1452 { 1453 if (xp->security) 1454 return copy_sec_ctx(xp->security, skb); 1455 return 0; 1456 } 1457 static inline size_t userpolicy_type_attrsize(void) 1458 { 1459 #ifdef CONFIG_XFRM_SUB_POLICY 1460 return nla_total_size(sizeof(struct xfrm_userpolicy_type)); 1461 #else 1462 return 0; 1463 #endif 1464 } 1465 1466 #ifdef CONFIG_XFRM_SUB_POLICY 1467 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1468 { 1469 struct xfrm_userpolicy_type upt = { 1470 .type = type, 1471 }; 1472 1473 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt); 1474 } 1475 1476 #else 1477 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1478 { 1479 return 0; 1480 } 1481 #endif 1482 1483 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr) 1484 { 1485 struct xfrm_dump_info *sp = ptr; 1486 struct xfrm_userpolicy_info *p; 1487 struct sk_buff *in_skb = sp->in_skb; 1488 struct sk_buff *skb = sp->out_skb; 1489 struct nlmsghdr *nlh; 1490 int err; 1491 1492 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq, 1493 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags); 1494 if (nlh == NULL) 1495 return -EMSGSIZE; 1496 1497 p = nlmsg_data(nlh); 1498 copy_to_user_policy(xp, p, dir); 1499 err = copy_to_user_tmpl(xp, skb); 1500 if (!err) 1501 err = copy_to_user_sec_ctx(xp, skb); 1502 if (!err) 1503 err = copy_to_user_policy_type(xp->type, skb); 1504 if (!err) 1505 err = xfrm_mark_put(skb, &xp->mark); 1506 if (err) { 1507 nlmsg_cancel(skb, nlh); 1508 return err; 1509 } 1510 nlmsg_end(skb, nlh); 1511 return 0; 1512 } 1513 1514 static int xfrm_dump_policy_done(struct netlink_callback *cb) 1515 { 1516 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1]; 1517 1518 xfrm_policy_walk_done(walk); 1519 return 0; 1520 } 1521 1522 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb) 1523 { 1524 struct net *net = sock_net(skb->sk); 1525 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1]; 1526 struct xfrm_dump_info info; 1527 1528 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) > 1529 sizeof(cb->args) - sizeof(cb->args[0])); 1530 1531 info.in_skb = cb->skb; 1532 info.out_skb = skb; 1533 info.nlmsg_seq = cb->nlh->nlmsg_seq; 1534 info.nlmsg_flags = NLM_F_MULTI; 1535 1536 if (!cb->args[0]) { 1537 cb->args[0] = 1; 1538 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY); 1539 } 1540 1541 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info); 1542 1543 return skb->len; 1544 } 1545 1546 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb, 1547 struct xfrm_policy *xp, 1548 int dir, u32 seq) 1549 { 1550 struct xfrm_dump_info info; 1551 struct sk_buff *skb; 1552 int err; 1553 1554 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1555 if (!skb) 1556 return ERR_PTR(-ENOMEM); 1557 1558 info.in_skb = in_skb; 1559 info.out_skb = skb; 1560 info.nlmsg_seq = seq; 1561 info.nlmsg_flags = 0; 1562 1563 err = dump_one_policy(xp, dir, 0, &info); 1564 if (err) { 1565 kfree_skb(skb); 1566 return ERR_PTR(err); 1567 } 1568 1569 return skb; 1570 } 1571 1572 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1573 struct nlattr **attrs) 1574 { 1575 struct net *net = sock_net(skb->sk); 1576 struct xfrm_policy *xp; 1577 struct xfrm_userpolicy_id *p; 1578 u8 type = XFRM_POLICY_TYPE_MAIN; 1579 int err; 1580 struct km_event c; 1581 int delete; 1582 struct xfrm_mark m; 1583 u32 mark = xfrm_mark_get(attrs, &m); 1584 1585 p = nlmsg_data(nlh); 1586 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY; 1587 1588 err = copy_from_user_policy_type(&type, attrs); 1589 if (err) 1590 return err; 1591 1592 err = verify_policy_dir(p->dir); 1593 if (err) 1594 return err; 1595 1596 if (p->index) 1597 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err); 1598 else { 1599 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1600 struct xfrm_sec_ctx *ctx; 1601 1602 err = verify_sec_ctx_len(attrs); 1603 if (err) 1604 return err; 1605 1606 ctx = NULL; 1607 if (rt) { 1608 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 1609 1610 err = security_xfrm_policy_alloc(&ctx, uctx); 1611 if (err) 1612 return err; 1613 } 1614 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel, 1615 ctx, delete, &err); 1616 security_xfrm_policy_free(ctx); 1617 } 1618 if (xp == NULL) 1619 return -ENOENT; 1620 1621 if (!delete) { 1622 struct sk_buff *resp_skb; 1623 1624 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq); 1625 if (IS_ERR(resp_skb)) { 1626 err = PTR_ERR(resp_skb); 1627 } else { 1628 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, 1629 NETLINK_CB(skb).pid); 1630 } 1631 } else { 1632 uid_t loginuid = audit_get_loginuid(current); 1633 u32 sessionid = audit_get_sessionid(current); 1634 u32 sid; 1635 1636 security_task_getsecid(current, &sid); 1637 xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid, 1638 sid); 1639 1640 if (err != 0) 1641 goto out; 1642 1643 c.data.byid = p->index; 1644 c.event = nlh->nlmsg_type; 1645 c.seq = nlh->nlmsg_seq; 1646 c.pid = nlh->nlmsg_pid; 1647 km_policy_notify(xp, p->dir, &c); 1648 } 1649 1650 out: 1651 xfrm_pol_put(xp); 1652 return err; 1653 } 1654 1655 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 1656 struct nlattr **attrs) 1657 { 1658 struct net *net = sock_net(skb->sk); 1659 struct km_event c; 1660 struct xfrm_usersa_flush *p = nlmsg_data(nlh); 1661 struct xfrm_audit audit_info; 1662 int err; 1663 1664 audit_info.loginuid = audit_get_loginuid(current); 1665 audit_info.sessionid = audit_get_sessionid(current); 1666 security_task_getsecid(current, &audit_info.secid); 1667 err = xfrm_state_flush(net, p->proto, &audit_info); 1668 if (err) { 1669 if (err == -ESRCH) /* empty table */ 1670 return 0; 1671 return err; 1672 } 1673 c.data.proto = p->proto; 1674 c.event = nlh->nlmsg_type; 1675 c.seq = nlh->nlmsg_seq; 1676 c.pid = nlh->nlmsg_pid; 1677 c.net = net; 1678 km_state_notify(NULL, &c); 1679 1680 return 0; 1681 } 1682 1683 static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x) 1684 { 1685 size_t replay_size = x->replay_esn ? 1686 xfrm_replay_state_esn_len(x->replay_esn) : 1687 sizeof(struct xfrm_replay_state); 1688 1689 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id)) 1690 + nla_total_size(replay_size) 1691 + nla_total_size(sizeof(struct xfrm_lifetime_cur)) 1692 + nla_total_size(sizeof(struct xfrm_mark)) 1693 + nla_total_size(4) /* XFRM_AE_RTHR */ 1694 + nla_total_size(4); /* XFRM_AE_ETHR */ 1695 } 1696 1697 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 1698 { 1699 struct xfrm_aevent_id *id; 1700 struct nlmsghdr *nlh; 1701 int err; 1702 1703 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0); 1704 if (nlh == NULL) 1705 return -EMSGSIZE; 1706 1707 id = nlmsg_data(nlh); 1708 memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr)); 1709 id->sa_id.spi = x->id.spi; 1710 id->sa_id.family = x->props.family; 1711 id->sa_id.proto = x->id.proto; 1712 memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr)); 1713 id->reqid = x->props.reqid; 1714 id->flags = c->data.aevent; 1715 1716 if (x->replay_esn) { 1717 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL, 1718 xfrm_replay_state_esn_len(x->replay_esn), 1719 x->replay_esn); 1720 } else { 1721 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), 1722 &x->replay); 1723 } 1724 if (err) 1725 goto out_cancel; 1726 err = nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft); 1727 if (err) 1728 goto out_cancel; 1729 1730 if (id->flags & XFRM_AE_RTHR) { 1731 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff); 1732 if (err) 1733 goto out_cancel; 1734 } 1735 if (id->flags & XFRM_AE_ETHR) { 1736 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH, 1737 x->replay_maxage * 10 / HZ); 1738 if (err) 1739 goto out_cancel; 1740 } 1741 err = xfrm_mark_put(skb, &x->mark); 1742 if (err) 1743 goto out_cancel; 1744 1745 return nlmsg_end(skb, nlh); 1746 1747 out_cancel: 1748 nlmsg_cancel(skb, nlh); 1749 return err; 1750 } 1751 1752 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 1753 struct nlattr **attrs) 1754 { 1755 struct net *net = sock_net(skb->sk); 1756 struct xfrm_state *x; 1757 struct sk_buff *r_skb; 1758 int err; 1759 struct km_event c; 1760 u32 mark; 1761 struct xfrm_mark m; 1762 struct xfrm_aevent_id *p = nlmsg_data(nlh); 1763 struct xfrm_usersa_id *id = &p->sa_id; 1764 1765 mark = xfrm_mark_get(attrs, &m); 1766 1767 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family); 1768 if (x == NULL) 1769 return -ESRCH; 1770 1771 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 1772 if (r_skb == NULL) { 1773 xfrm_state_put(x); 1774 return -ENOMEM; 1775 } 1776 1777 /* 1778 * XXX: is this lock really needed - none of the other 1779 * gets lock (the concern is things getting updated 1780 * while we are still reading) - jhs 1781 */ 1782 spin_lock_bh(&x->lock); 1783 c.data.aevent = p->flags; 1784 c.seq = nlh->nlmsg_seq; 1785 c.pid = nlh->nlmsg_pid; 1786 1787 if (build_aevent(r_skb, x, &c) < 0) 1788 BUG(); 1789 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).pid); 1790 spin_unlock_bh(&x->lock); 1791 xfrm_state_put(x); 1792 return err; 1793 } 1794 1795 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 1796 struct nlattr **attrs) 1797 { 1798 struct net *net = sock_net(skb->sk); 1799 struct xfrm_state *x; 1800 struct km_event c; 1801 int err = - EINVAL; 1802 u32 mark = 0; 1803 struct xfrm_mark m; 1804 struct xfrm_aevent_id *p = nlmsg_data(nlh); 1805 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 1806 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL]; 1807 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 1808 1809 if (!lt && !rp && !re) 1810 return err; 1811 1812 /* pedantic mode - thou shalt sayeth replaceth */ 1813 if (!(nlh->nlmsg_flags&NLM_F_REPLACE)) 1814 return err; 1815 1816 mark = xfrm_mark_get(attrs, &m); 1817 1818 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family); 1819 if (x == NULL) 1820 return -ESRCH; 1821 1822 if (x->km.state != XFRM_STATE_VALID) 1823 goto out; 1824 1825 err = xfrm_replay_verify_len(x->replay_esn, rp); 1826 if (err) 1827 goto out; 1828 1829 spin_lock_bh(&x->lock); 1830 xfrm_update_ae_params(x, attrs); 1831 spin_unlock_bh(&x->lock); 1832 1833 c.event = nlh->nlmsg_type; 1834 c.seq = nlh->nlmsg_seq; 1835 c.pid = nlh->nlmsg_pid; 1836 c.data.aevent = XFRM_AE_CU; 1837 km_state_notify(x, &c); 1838 err = 0; 1839 out: 1840 xfrm_state_put(x); 1841 return err; 1842 } 1843 1844 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1845 struct nlattr **attrs) 1846 { 1847 struct net *net = sock_net(skb->sk); 1848 struct km_event c; 1849 u8 type = XFRM_POLICY_TYPE_MAIN; 1850 int err; 1851 struct xfrm_audit audit_info; 1852 1853 err = copy_from_user_policy_type(&type, attrs); 1854 if (err) 1855 return err; 1856 1857 audit_info.loginuid = audit_get_loginuid(current); 1858 audit_info.sessionid = audit_get_sessionid(current); 1859 security_task_getsecid(current, &audit_info.secid); 1860 err = xfrm_policy_flush(net, type, &audit_info); 1861 if (err) { 1862 if (err == -ESRCH) /* empty table */ 1863 return 0; 1864 return err; 1865 } 1866 1867 c.data.type = type; 1868 c.event = nlh->nlmsg_type; 1869 c.seq = nlh->nlmsg_seq; 1870 c.pid = nlh->nlmsg_pid; 1871 c.net = net; 1872 km_policy_notify(NULL, 0, &c); 1873 return 0; 1874 } 1875 1876 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 1877 struct nlattr **attrs) 1878 { 1879 struct net *net = sock_net(skb->sk); 1880 struct xfrm_policy *xp; 1881 struct xfrm_user_polexpire *up = nlmsg_data(nlh); 1882 struct xfrm_userpolicy_info *p = &up->pol; 1883 u8 type = XFRM_POLICY_TYPE_MAIN; 1884 int err = -ENOENT; 1885 struct xfrm_mark m; 1886 u32 mark = xfrm_mark_get(attrs, &m); 1887 1888 err = copy_from_user_policy_type(&type, attrs); 1889 if (err) 1890 return err; 1891 1892 err = verify_policy_dir(p->dir); 1893 if (err) 1894 return err; 1895 1896 if (p->index) 1897 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err); 1898 else { 1899 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1900 struct xfrm_sec_ctx *ctx; 1901 1902 err = verify_sec_ctx_len(attrs); 1903 if (err) 1904 return err; 1905 1906 ctx = NULL; 1907 if (rt) { 1908 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 1909 1910 err = security_xfrm_policy_alloc(&ctx, uctx); 1911 if (err) 1912 return err; 1913 } 1914 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, 1915 &p->sel, ctx, 0, &err); 1916 security_xfrm_policy_free(ctx); 1917 } 1918 if (xp == NULL) 1919 return -ENOENT; 1920 1921 if (unlikely(xp->walk.dead)) 1922 goto out; 1923 1924 err = 0; 1925 if (up->hard) { 1926 uid_t loginuid = audit_get_loginuid(current); 1927 u32 sessionid = audit_get_sessionid(current); 1928 u32 sid; 1929 1930 security_task_getsecid(current, &sid); 1931 xfrm_policy_delete(xp, p->dir); 1932 xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid); 1933 1934 } else { 1935 // reset the timers here? 1936 WARN(1, "Dont know what to do with soft policy expire\n"); 1937 } 1938 km_policy_expired(xp, p->dir, up->hard, current->pid); 1939 1940 out: 1941 xfrm_pol_put(xp); 1942 return err; 1943 } 1944 1945 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 1946 struct nlattr **attrs) 1947 { 1948 struct net *net = sock_net(skb->sk); 1949 struct xfrm_state *x; 1950 int err; 1951 struct xfrm_user_expire *ue = nlmsg_data(nlh); 1952 struct xfrm_usersa_info *p = &ue->state; 1953 struct xfrm_mark m; 1954 u32 mark = xfrm_mark_get(attrs, &m); 1955 1956 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family); 1957 1958 err = -ENOENT; 1959 if (x == NULL) 1960 return err; 1961 1962 spin_lock_bh(&x->lock); 1963 err = -EINVAL; 1964 if (x->km.state != XFRM_STATE_VALID) 1965 goto out; 1966 km_state_expired(x, ue->hard, current->pid); 1967 1968 if (ue->hard) { 1969 uid_t loginuid = audit_get_loginuid(current); 1970 u32 sessionid = audit_get_sessionid(current); 1971 u32 sid; 1972 1973 security_task_getsecid(current, &sid); 1974 __xfrm_state_delete(x); 1975 xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid); 1976 } 1977 err = 0; 1978 out: 1979 spin_unlock_bh(&x->lock); 1980 xfrm_state_put(x); 1981 return err; 1982 } 1983 1984 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, 1985 struct nlattr **attrs) 1986 { 1987 struct net *net = sock_net(skb->sk); 1988 struct xfrm_policy *xp; 1989 struct xfrm_user_tmpl *ut; 1990 int i; 1991 struct nlattr *rt = attrs[XFRMA_TMPL]; 1992 struct xfrm_mark mark; 1993 1994 struct xfrm_user_acquire *ua = nlmsg_data(nlh); 1995 struct xfrm_state *x = xfrm_state_alloc(net); 1996 int err = -ENOMEM; 1997 1998 if (!x) 1999 goto nomem; 2000 2001 xfrm_mark_get(attrs, &mark); 2002 2003 err = verify_newpolicy_info(&ua->policy); 2004 if (err) 2005 goto bad_policy; 2006 2007 /* build an XP */ 2008 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err); 2009 if (!xp) 2010 goto free_state; 2011 2012 memcpy(&x->id, &ua->id, sizeof(ua->id)); 2013 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr)); 2014 memcpy(&x->sel, &ua->sel, sizeof(ua->sel)); 2015 xp->mark.m = x->mark.m = mark.m; 2016 xp->mark.v = x->mark.v = mark.v; 2017 ut = nla_data(rt); 2018 /* extract the templates and for each call km_key */ 2019 for (i = 0; i < xp->xfrm_nr; i++, ut++) { 2020 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 2021 memcpy(&x->id, &t->id, sizeof(x->id)); 2022 x->props.mode = t->mode; 2023 x->props.reqid = t->reqid; 2024 x->props.family = ut->family; 2025 t->aalgos = ua->aalgos; 2026 t->ealgos = ua->ealgos; 2027 t->calgos = ua->calgos; 2028 err = km_query(x, t, xp); 2029 2030 } 2031 2032 kfree(x); 2033 kfree(xp); 2034 2035 return 0; 2036 2037 bad_policy: 2038 WARN(1, "BAD policy passed\n"); 2039 free_state: 2040 kfree(x); 2041 nomem: 2042 return err; 2043 } 2044 2045 #ifdef CONFIG_XFRM_MIGRATE 2046 static int copy_from_user_migrate(struct xfrm_migrate *ma, 2047 struct xfrm_kmaddress *k, 2048 struct nlattr **attrs, int *num) 2049 { 2050 struct nlattr *rt = attrs[XFRMA_MIGRATE]; 2051 struct xfrm_user_migrate *um; 2052 int i, num_migrate; 2053 2054 if (k != NULL) { 2055 struct xfrm_user_kmaddress *uk; 2056 2057 uk = nla_data(attrs[XFRMA_KMADDRESS]); 2058 memcpy(&k->local, &uk->local, sizeof(k->local)); 2059 memcpy(&k->remote, &uk->remote, sizeof(k->remote)); 2060 k->family = uk->family; 2061 k->reserved = uk->reserved; 2062 } 2063 2064 um = nla_data(rt); 2065 num_migrate = nla_len(rt) / sizeof(*um); 2066 2067 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH) 2068 return -EINVAL; 2069 2070 for (i = 0; i < num_migrate; i++, um++, ma++) { 2071 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr)); 2072 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr)); 2073 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr)); 2074 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr)); 2075 2076 ma->proto = um->proto; 2077 ma->mode = um->mode; 2078 ma->reqid = um->reqid; 2079 2080 ma->old_family = um->old_family; 2081 ma->new_family = um->new_family; 2082 } 2083 2084 *num = i; 2085 return 0; 2086 } 2087 2088 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 2089 struct nlattr **attrs) 2090 { 2091 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh); 2092 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 2093 struct xfrm_kmaddress km, *kmp; 2094 u8 type; 2095 int err; 2096 int n = 0; 2097 2098 if (attrs[XFRMA_MIGRATE] == NULL) 2099 return -EINVAL; 2100 2101 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL; 2102 2103 err = copy_from_user_policy_type(&type, attrs); 2104 if (err) 2105 return err; 2106 2107 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n); 2108 if (err) 2109 return err; 2110 2111 if (!n) 2112 return 0; 2113 2114 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp); 2115 2116 return 0; 2117 } 2118 #else 2119 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 2120 struct nlattr **attrs) 2121 { 2122 return -ENOPROTOOPT; 2123 } 2124 #endif 2125 2126 #ifdef CONFIG_XFRM_MIGRATE 2127 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb) 2128 { 2129 struct xfrm_user_migrate um; 2130 2131 memset(&um, 0, sizeof(um)); 2132 um.proto = m->proto; 2133 um.mode = m->mode; 2134 um.reqid = m->reqid; 2135 um.old_family = m->old_family; 2136 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr)); 2137 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr)); 2138 um.new_family = m->new_family; 2139 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr)); 2140 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr)); 2141 2142 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um); 2143 } 2144 2145 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb) 2146 { 2147 struct xfrm_user_kmaddress uk; 2148 2149 memset(&uk, 0, sizeof(uk)); 2150 uk.family = k->family; 2151 uk.reserved = k->reserved; 2152 memcpy(&uk.local, &k->local, sizeof(uk.local)); 2153 memcpy(&uk.remote, &k->remote, sizeof(uk.remote)); 2154 2155 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk); 2156 } 2157 2158 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma) 2159 { 2160 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id)) 2161 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0) 2162 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate) 2163 + userpolicy_type_attrsize(); 2164 } 2165 2166 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m, 2167 int num_migrate, const struct xfrm_kmaddress *k, 2168 const struct xfrm_selector *sel, u8 dir, u8 type) 2169 { 2170 const struct xfrm_migrate *mp; 2171 struct xfrm_userpolicy_id *pol_id; 2172 struct nlmsghdr *nlh; 2173 int i, err; 2174 2175 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0); 2176 if (nlh == NULL) 2177 return -EMSGSIZE; 2178 2179 pol_id = nlmsg_data(nlh); 2180 /* copy data from selector, dir, and type to the pol_id */ 2181 memset(pol_id, 0, sizeof(*pol_id)); 2182 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel)); 2183 pol_id->dir = dir; 2184 2185 if (k != NULL) { 2186 err = copy_to_user_kmaddress(k, skb); 2187 if (err) 2188 goto out_cancel; 2189 } 2190 err = copy_to_user_policy_type(type, skb); 2191 if (err) 2192 goto out_cancel; 2193 for (i = 0, mp = m ; i < num_migrate; i++, mp++) { 2194 err = copy_to_user_migrate(mp, skb); 2195 if (err) 2196 goto out_cancel; 2197 } 2198 2199 return nlmsg_end(skb, nlh); 2200 2201 out_cancel: 2202 nlmsg_cancel(skb, nlh); 2203 return err; 2204 } 2205 2206 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2207 const struct xfrm_migrate *m, int num_migrate, 2208 const struct xfrm_kmaddress *k) 2209 { 2210 struct net *net = &init_net; 2211 struct sk_buff *skb; 2212 2213 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC); 2214 if (skb == NULL) 2215 return -ENOMEM; 2216 2217 /* build migrate */ 2218 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0) 2219 BUG(); 2220 2221 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC); 2222 } 2223 #else 2224 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2225 const struct xfrm_migrate *m, int num_migrate, 2226 const struct xfrm_kmaddress *k) 2227 { 2228 return -ENOPROTOOPT; 2229 } 2230 #endif 2231 2232 #define XMSGSIZE(type) sizeof(struct type) 2233 2234 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = { 2235 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2236 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2237 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2238 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2239 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2240 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2241 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info), 2242 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire), 2243 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire), 2244 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2245 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2246 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire), 2247 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush), 2248 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0, 2249 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2250 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2251 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report), 2252 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2253 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32), 2254 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 2255 }; 2256 2257 #undef XMSGSIZE 2258 2259 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = { 2260 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)}, 2261 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)}, 2262 [XFRMA_LASTUSED] = { .type = NLA_U64}, 2263 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)}, 2264 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) }, 2265 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) }, 2266 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) }, 2267 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) }, 2268 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) }, 2269 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) }, 2270 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) }, 2271 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) }, 2272 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) }, 2273 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 }, 2274 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 }, 2275 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) }, 2276 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) }, 2277 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)}, 2278 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) }, 2279 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) }, 2280 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) }, 2281 [XFRMA_TFCPAD] = { .type = NLA_U32 }, 2282 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) }, 2283 }; 2284 2285 static struct xfrm_link { 2286 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **); 2287 int (*dump)(struct sk_buff *, struct netlink_callback *); 2288 int (*done)(struct netlink_callback *); 2289 } xfrm_dispatch[XFRM_NR_MSGTYPES] = { 2290 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 2291 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa }, 2292 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa, 2293 .dump = xfrm_dump_sa, 2294 .done = xfrm_dump_sa_done }, 2295 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 2296 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy }, 2297 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy, 2298 .dump = xfrm_dump_policy, 2299 .done = xfrm_dump_policy_done }, 2300 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi }, 2301 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire }, 2302 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire }, 2303 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 2304 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 2305 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire}, 2306 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa }, 2307 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy }, 2308 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae }, 2309 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae }, 2310 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate }, 2311 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo }, 2312 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo }, 2313 }; 2314 2315 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 2316 { 2317 struct net *net = sock_net(skb->sk); 2318 struct nlattr *attrs[XFRMA_MAX+1]; 2319 struct xfrm_link *link; 2320 int type, err; 2321 2322 type = nlh->nlmsg_type; 2323 if (type > XFRM_MSG_MAX) 2324 return -EINVAL; 2325 2326 type -= XFRM_MSG_BASE; 2327 link = &xfrm_dispatch[type]; 2328 2329 /* All operations require privileges, even GET */ 2330 if (!capable(CAP_NET_ADMIN)) 2331 return -EPERM; 2332 2333 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) || 2334 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) && 2335 (nlh->nlmsg_flags & NLM_F_DUMP)) { 2336 if (link->dump == NULL) 2337 return -EINVAL; 2338 2339 { 2340 struct netlink_dump_control c = { 2341 .dump = link->dump, 2342 .done = link->done, 2343 }; 2344 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c); 2345 } 2346 } 2347 2348 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX, 2349 xfrma_policy); 2350 if (err < 0) 2351 return err; 2352 2353 if (link->doit == NULL) 2354 return -EINVAL; 2355 2356 return link->doit(skb, nlh, attrs); 2357 } 2358 2359 static void xfrm_netlink_rcv(struct sk_buff *skb) 2360 { 2361 mutex_lock(&xfrm_cfg_mutex); 2362 netlink_rcv_skb(skb, &xfrm_user_rcv_msg); 2363 mutex_unlock(&xfrm_cfg_mutex); 2364 } 2365 2366 static inline size_t xfrm_expire_msgsize(void) 2367 { 2368 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire)) 2369 + nla_total_size(sizeof(struct xfrm_mark)); 2370 } 2371 2372 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 2373 { 2374 struct xfrm_user_expire *ue; 2375 struct nlmsghdr *nlh; 2376 int err; 2377 2378 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0); 2379 if (nlh == NULL) 2380 return -EMSGSIZE; 2381 2382 ue = nlmsg_data(nlh); 2383 copy_to_user_state(x, &ue->state); 2384 ue->hard = (c->data.hard != 0) ? 1 : 0; 2385 2386 err = xfrm_mark_put(skb, &x->mark); 2387 if (err) 2388 return err; 2389 2390 return nlmsg_end(skb, nlh); 2391 } 2392 2393 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c) 2394 { 2395 struct net *net = xs_net(x); 2396 struct sk_buff *skb; 2397 2398 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC); 2399 if (skb == NULL) 2400 return -ENOMEM; 2401 2402 if (build_expire(skb, x, c) < 0) { 2403 kfree_skb(skb); 2404 return -EMSGSIZE; 2405 } 2406 2407 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC); 2408 } 2409 2410 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c) 2411 { 2412 struct net *net = xs_net(x); 2413 struct sk_buff *skb; 2414 2415 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 2416 if (skb == NULL) 2417 return -ENOMEM; 2418 2419 if (build_aevent(skb, x, c) < 0) 2420 BUG(); 2421 2422 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC); 2423 } 2424 2425 static int xfrm_notify_sa_flush(const struct km_event *c) 2426 { 2427 struct net *net = c->net; 2428 struct xfrm_usersa_flush *p; 2429 struct nlmsghdr *nlh; 2430 struct sk_buff *skb; 2431 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush)); 2432 2433 skb = nlmsg_new(len, GFP_ATOMIC); 2434 if (skb == NULL) 2435 return -ENOMEM; 2436 2437 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0); 2438 if (nlh == NULL) { 2439 kfree_skb(skb); 2440 return -EMSGSIZE; 2441 } 2442 2443 p = nlmsg_data(nlh); 2444 p->proto = c->data.proto; 2445 2446 nlmsg_end(skb, nlh); 2447 2448 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC); 2449 } 2450 2451 static inline size_t xfrm_sa_len(struct xfrm_state *x) 2452 { 2453 size_t l = 0; 2454 if (x->aead) 2455 l += nla_total_size(aead_len(x->aead)); 2456 if (x->aalg) { 2457 l += nla_total_size(sizeof(struct xfrm_algo) + 2458 (x->aalg->alg_key_len + 7) / 8); 2459 l += nla_total_size(xfrm_alg_auth_len(x->aalg)); 2460 } 2461 if (x->ealg) 2462 l += nla_total_size(xfrm_alg_len(x->ealg)); 2463 if (x->calg) 2464 l += nla_total_size(sizeof(*x->calg)); 2465 if (x->encap) 2466 l += nla_total_size(sizeof(*x->encap)); 2467 if (x->tfcpad) 2468 l += nla_total_size(sizeof(x->tfcpad)); 2469 if (x->replay_esn) 2470 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn)); 2471 if (x->security) 2472 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) + 2473 x->security->ctx_len); 2474 if (x->coaddr) 2475 l += nla_total_size(sizeof(*x->coaddr)); 2476 2477 /* Must count x->lastused as it may become non-zero behind our back. */ 2478 l += nla_total_size(sizeof(u64)); 2479 2480 return l; 2481 } 2482 2483 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c) 2484 { 2485 struct net *net = xs_net(x); 2486 struct xfrm_usersa_info *p; 2487 struct xfrm_usersa_id *id; 2488 struct nlmsghdr *nlh; 2489 struct sk_buff *skb; 2490 int len = xfrm_sa_len(x); 2491 int headlen, err; 2492 2493 headlen = sizeof(*p); 2494 if (c->event == XFRM_MSG_DELSA) { 2495 len += nla_total_size(headlen); 2496 headlen = sizeof(*id); 2497 len += nla_total_size(sizeof(struct xfrm_mark)); 2498 } 2499 len += NLMSG_ALIGN(headlen); 2500 2501 skb = nlmsg_new(len, GFP_ATOMIC); 2502 if (skb == NULL) 2503 return -ENOMEM; 2504 2505 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0); 2506 err = -EMSGSIZE; 2507 if (nlh == NULL) 2508 goto out_free_skb; 2509 2510 p = nlmsg_data(nlh); 2511 if (c->event == XFRM_MSG_DELSA) { 2512 struct nlattr *attr; 2513 2514 id = nlmsg_data(nlh); 2515 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr)); 2516 id->spi = x->id.spi; 2517 id->family = x->props.family; 2518 id->proto = x->id.proto; 2519 2520 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p)); 2521 err = -EMSGSIZE; 2522 if (attr == NULL) 2523 goto out_free_skb; 2524 2525 p = nla_data(attr); 2526 } 2527 err = copy_to_user_state_extra(x, p, skb); 2528 if (err) 2529 goto out_free_skb; 2530 2531 nlmsg_end(skb, nlh); 2532 2533 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC); 2534 2535 out_free_skb: 2536 kfree_skb(skb); 2537 return err; 2538 } 2539 2540 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c) 2541 { 2542 2543 switch (c->event) { 2544 case XFRM_MSG_EXPIRE: 2545 return xfrm_exp_state_notify(x, c); 2546 case XFRM_MSG_NEWAE: 2547 return xfrm_aevent_state_notify(x, c); 2548 case XFRM_MSG_DELSA: 2549 case XFRM_MSG_UPDSA: 2550 case XFRM_MSG_NEWSA: 2551 return xfrm_notify_sa(x, c); 2552 case XFRM_MSG_FLUSHSA: 2553 return xfrm_notify_sa_flush(c); 2554 default: 2555 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n", 2556 c->event); 2557 break; 2558 } 2559 2560 return 0; 2561 2562 } 2563 2564 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x, 2565 struct xfrm_policy *xp) 2566 { 2567 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire)) 2568 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 2569 + nla_total_size(sizeof(struct xfrm_mark)) 2570 + nla_total_size(xfrm_user_sec_ctx_size(x->security)) 2571 + userpolicy_type_attrsize(); 2572 } 2573 2574 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x, 2575 struct xfrm_tmpl *xt, struct xfrm_policy *xp, 2576 int dir) 2577 { 2578 __u32 seq = xfrm_get_acqseq(); 2579 struct xfrm_user_acquire *ua; 2580 struct nlmsghdr *nlh; 2581 int err; 2582 2583 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0); 2584 if (nlh == NULL) 2585 return -EMSGSIZE; 2586 2587 ua = nlmsg_data(nlh); 2588 memcpy(&ua->id, &x->id, sizeof(ua->id)); 2589 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr)); 2590 memcpy(&ua->sel, &x->sel, sizeof(ua->sel)); 2591 copy_to_user_policy(xp, &ua->policy, dir); 2592 ua->aalgos = xt->aalgos; 2593 ua->ealgos = xt->ealgos; 2594 ua->calgos = xt->calgos; 2595 ua->seq = x->km.seq = seq; 2596 2597 err = copy_to_user_tmpl(xp, skb); 2598 if (!err) 2599 err = copy_to_user_state_sec_ctx(x, skb); 2600 if (!err) 2601 err = copy_to_user_policy_type(xp->type, skb); 2602 if (!err) 2603 err = xfrm_mark_put(skb, &xp->mark); 2604 if (err) { 2605 nlmsg_cancel(skb, nlh); 2606 return err; 2607 } 2608 2609 return nlmsg_end(skb, nlh); 2610 } 2611 2612 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt, 2613 struct xfrm_policy *xp, int dir) 2614 { 2615 struct net *net = xs_net(x); 2616 struct sk_buff *skb; 2617 2618 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC); 2619 if (skb == NULL) 2620 return -ENOMEM; 2621 2622 if (build_acquire(skb, x, xt, xp, dir) < 0) 2623 BUG(); 2624 2625 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC); 2626 } 2627 2628 /* User gives us xfrm_user_policy_info followed by an array of 0 2629 * or more templates. 2630 */ 2631 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt, 2632 u8 *data, int len, int *dir) 2633 { 2634 struct net *net = sock_net(sk); 2635 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data; 2636 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1); 2637 struct xfrm_policy *xp; 2638 int nr; 2639 2640 switch (sk->sk_family) { 2641 case AF_INET: 2642 if (opt != IP_XFRM_POLICY) { 2643 *dir = -EOPNOTSUPP; 2644 return NULL; 2645 } 2646 break; 2647 #if IS_ENABLED(CONFIG_IPV6) 2648 case AF_INET6: 2649 if (opt != IPV6_XFRM_POLICY) { 2650 *dir = -EOPNOTSUPP; 2651 return NULL; 2652 } 2653 break; 2654 #endif 2655 default: 2656 *dir = -EINVAL; 2657 return NULL; 2658 } 2659 2660 *dir = -EINVAL; 2661 2662 if (len < sizeof(*p) || 2663 verify_newpolicy_info(p)) 2664 return NULL; 2665 2666 nr = ((len - sizeof(*p)) / sizeof(*ut)); 2667 if (validate_tmpl(nr, ut, p->sel.family)) 2668 return NULL; 2669 2670 if (p->dir > XFRM_POLICY_OUT) 2671 return NULL; 2672 2673 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 2674 if (xp == NULL) { 2675 *dir = -ENOBUFS; 2676 return NULL; 2677 } 2678 2679 copy_from_user_policy(xp, p); 2680 xp->type = XFRM_POLICY_TYPE_MAIN; 2681 copy_templates(xp, ut, nr); 2682 2683 *dir = p->dir; 2684 2685 return xp; 2686 } 2687 2688 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp) 2689 { 2690 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire)) 2691 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 2692 + nla_total_size(xfrm_user_sec_ctx_size(xp->security)) 2693 + nla_total_size(sizeof(struct xfrm_mark)) 2694 + userpolicy_type_attrsize(); 2695 } 2696 2697 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp, 2698 int dir, const struct km_event *c) 2699 { 2700 struct xfrm_user_polexpire *upe; 2701 int hard = c->data.hard; 2702 struct nlmsghdr *nlh; 2703 int err; 2704 2705 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0); 2706 if (nlh == NULL) 2707 return -EMSGSIZE; 2708 2709 upe = nlmsg_data(nlh); 2710 copy_to_user_policy(xp, &upe->pol, dir); 2711 err = copy_to_user_tmpl(xp, skb); 2712 if (!err) 2713 err = copy_to_user_sec_ctx(xp, skb); 2714 if (!err) 2715 err = copy_to_user_policy_type(xp->type, skb); 2716 if (!err) 2717 err = xfrm_mark_put(skb, &xp->mark); 2718 if (err) { 2719 nlmsg_cancel(skb, nlh); 2720 return err; 2721 } 2722 upe->hard = !!hard; 2723 2724 return nlmsg_end(skb, nlh); 2725 } 2726 2727 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 2728 { 2729 struct net *net = xp_net(xp); 2730 struct sk_buff *skb; 2731 2732 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC); 2733 if (skb == NULL) 2734 return -ENOMEM; 2735 2736 if (build_polexpire(skb, xp, dir, c) < 0) 2737 BUG(); 2738 2739 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC); 2740 } 2741 2742 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) 2743 { 2744 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); 2745 struct net *net = xp_net(xp); 2746 struct xfrm_userpolicy_info *p; 2747 struct xfrm_userpolicy_id *id; 2748 struct nlmsghdr *nlh; 2749 struct sk_buff *skb; 2750 int headlen, err; 2751 2752 headlen = sizeof(*p); 2753 if (c->event == XFRM_MSG_DELPOLICY) { 2754 len += nla_total_size(headlen); 2755 headlen = sizeof(*id); 2756 } 2757 len += userpolicy_type_attrsize(); 2758 len += nla_total_size(sizeof(struct xfrm_mark)); 2759 len += NLMSG_ALIGN(headlen); 2760 2761 skb = nlmsg_new(len, GFP_ATOMIC); 2762 if (skb == NULL) 2763 return -ENOMEM; 2764 2765 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0); 2766 err = -EMSGSIZE; 2767 if (nlh == NULL) 2768 goto out_free_skb; 2769 2770 p = nlmsg_data(nlh); 2771 if (c->event == XFRM_MSG_DELPOLICY) { 2772 struct nlattr *attr; 2773 2774 id = nlmsg_data(nlh); 2775 memset(id, 0, sizeof(*id)); 2776 id->dir = dir; 2777 if (c->data.byid) 2778 id->index = xp->index; 2779 else 2780 memcpy(&id->sel, &xp->selector, sizeof(id->sel)); 2781 2782 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p)); 2783 err = -EMSGSIZE; 2784 if (attr == NULL) 2785 goto out_free_skb; 2786 2787 p = nla_data(attr); 2788 } 2789 2790 copy_to_user_policy(xp, p, dir); 2791 err = copy_to_user_tmpl(xp, skb); 2792 if (!err) 2793 err = copy_to_user_policy_type(xp->type, skb); 2794 if (!err) 2795 err = xfrm_mark_put(skb, &xp->mark); 2796 if (err) 2797 goto out_free_skb; 2798 2799 nlmsg_end(skb, nlh); 2800 2801 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC); 2802 2803 out_free_skb: 2804 kfree_skb(skb); 2805 return err; 2806 } 2807 2808 static int xfrm_notify_policy_flush(const struct km_event *c) 2809 { 2810 struct net *net = c->net; 2811 struct nlmsghdr *nlh; 2812 struct sk_buff *skb; 2813 int err; 2814 2815 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC); 2816 if (skb == NULL) 2817 return -ENOMEM; 2818 2819 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0); 2820 err = -EMSGSIZE; 2821 if (nlh == NULL) 2822 goto out_free_skb; 2823 err = copy_to_user_policy_type(c->data.type, skb); 2824 if (err) 2825 goto out_free_skb; 2826 2827 nlmsg_end(skb, nlh); 2828 2829 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC); 2830 2831 out_free_skb: 2832 kfree_skb(skb); 2833 return err; 2834 } 2835 2836 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 2837 { 2838 2839 switch (c->event) { 2840 case XFRM_MSG_NEWPOLICY: 2841 case XFRM_MSG_UPDPOLICY: 2842 case XFRM_MSG_DELPOLICY: 2843 return xfrm_notify_policy(xp, dir, c); 2844 case XFRM_MSG_FLUSHPOLICY: 2845 return xfrm_notify_policy_flush(c); 2846 case XFRM_MSG_POLEXPIRE: 2847 return xfrm_exp_policy_notify(xp, dir, c); 2848 default: 2849 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n", 2850 c->event); 2851 } 2852 2853 return 0; 2854 2855 } 2856 2857 static inline size_t xfrm_report_msgsize(void) 2858 { 2859 return NLMSG_ALIGN(sizeof(struct xfrm_user_report)); 2860 } 2861 2862 static int build_report(struct sk_buff *skb, u8 proto, 2863 struct xfrm_selector *sel, xfrm_address_t *addr) 2864 { 2865 struct xfrm_user_report *ur; 2866 struct nlmsghdr *nlh; 2867 2868 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0); 2869 if (nlh == NULL) 2870 return -EMSGSIZE; 2871 2872 ur = nlmsg_data(nlh); 2873 ur->proto = proto; 2874 memcpy(&ur->sel, sel, sizeof(ur->sel)); 2875 2876 if (addr) { 2877 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr); 2878 if (err) { 2879 nlmsg_cancel(skb, nlh); 2880 return err; 2881 } 2882 } 2883 return nlmsg_end(skb, nlh); 2884 } 2885 2886 static int xfrm_send_report(struct net *net, u8 proto, 2887 struct xfrm_selector *sel, xfrm_address_t *addr) 2888 { 2889 struct sk_buff *skb; 2890 2891 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC); 2892 if (skb == NULL) 2893 return -ENOMEM; 2894 2895 if (build_report(skb, proto, sel, addr) < 0) 2896 BUG(); 2897 2898 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC); 2899 } 2900 2901 static inline size_t xfrm_mapping_msgsize(void) 2902 { 2903 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping)); 2904 } 2905 2906 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x, 2907 xfrm_address_t *new_saddr, __be16 new_sport) 2908 { 2909 struct xfrm_user_mapping *um; 2910 struct nlmsghdr *nlh; 2911 2912 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0); 2913 if (nlh == NULL) 2914 return -EMSGSIZE; 2915 2916 um = nlmsg_data(nlh); 2917 2918 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr)); 2919 um->id.spi = x->id.spi; 2920 um->id.family = x->props.family; 2921 um->id.proto = x->id.proto; 2922 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr)); 2923 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr)); 2924 um->new_sport = new_sport; 2925 um->old_sport = x->encap->encap_sport; 2926 um->reqid = x->props.reqid; 2927 2928 return nlmsg_end(skb, nlh); 2929 } 2930 2931 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, 2932 __be16 sport) 2933 { 2934 struct net *net = xs_net(x); 2935 struct sk_buff *skb; 2936 2937 if (x->id.proto != IPPROTO_ESP) 2938 return -EINVAL; 2939 2940 if (!x->encap) 2941 return -EINVAL; 2942 2943 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC); 2944 if (skb == NULL) 2945 return -ENOMEM; 2946 2947 if (build_mapping(skb, x, ipaddr, sport) < 0) 2948 BUG(); 2949 2950 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MAPPING, GFP_ATOMIC); 2951 } 2952 2953 static struct xfrm_mgr netlink_mgr = { 2954 .id = "netlink", 2955 .notify = xfrm_send_state_notify, 2956 .acquire = xfrm_send_acquire, 2957 .compile_policy = xfrm_compile_policy, 2958 .notify_policy = xfrm_send_policy_notify, 2959 .report = xfrm_send_report, 2960 .migrate = xfrm_send_migrate, 2961 .new_mapping = xfrm_send_mapping, 2962 }; 2963 2964 static int __net_init xfrm_user_net_init(struct net *net) 2965 { 2966 struct sock *nlsk; 2967 struct netlink_kernel_cfg cfg = { 2968 .groups = XFRMNLGRP_MAX, 2969 .input = xfrm_netlink_rcv, 2970 }; 2971 2972 nlsk = netlink_kernel_create(net, NETLINK_XFRM, THIS_MODULE, &cfg); 2973 if (nlsk == NULL) 2974 return -ENOMEM; 2975 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */ 2976 rcu_assign_pointer(net->xfrm.nlsk, nlsk); 2977 return 0; 2978 } 2979 2980 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list) 2981 { 2982 struct net *net; 2983 list_for_each_entry(net, net_exit_list, exit_list) 2984 RCU_INIT_POINTER(net->xfrm.nlsk, NULL); 2985 synchronize_net(); 2986 list_for_each_entry(net, net_exit_list, exit_list) 2987 netlink_kernel_release(net->xfrm.nlsk_stash); 2988 } 2989 2990 static struct pernet_operations xfrm_user_net_ops = { 2991 .init = xfrm_user_net_init, 2992 .exit_batch = xfrm_user_net_exit, 2993 }; 2994 2995 static int __init xfrm_user_init(void) 2996 { 2997 int rv; 2998 2999 printk(KERN_INFO "Initializing XFRM netlink socket\n"); 3000 3001 rv = register_pernet_subsys(&xfrm_user_net_ops); 3002 if (rv < 0) 3003 return rv; 3004 rv = xfrm_register_km(&netlink_mgr); 3005 if (rv < 0) 3006 unregister_pernet_subsys(&xfrm_user_net_ops); 3007 return rv; 3008 } 3009 3010 static void __exit xfrm_user_exit(void) 3011 { 3012 xfrm_unregister_km(&netlink_mgr); 3013 unregister_pernet_subsys(&xfrm_user_net_ops); 3014 } 3015 3016 module_init(xfrm_user_init); 3017 module_exit(xfrm_user_exit); 3018 MODULE_LICENSE("GPL"); 3019 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM); 3020 3021