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 int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type) 36 { 37 struct nlattr *rt = attrs[type]; 38 struct xfrm_algo *algp; 39 40 if (!rt) 41 return 0; 42 43 algp = nla_data(rt); 44 if (nla_len(rt) < xfrm_alg_len(algp)) 45 return -EINVAL; 46 47 switch (type) { 48 case XFRMA_ALG_AUTH: 49 case XFRMA_ALG_CRYPT: 50 case XFRMA_ALG_COMP: 51 break; 52 53 default: 54 return -EINVAL; 55 } 56 57 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; 58 return 0; 59 } 60 61 static int verify_auth_trunc(struct nlattr **attrs) 62 { 63 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC]; 64 struct xfrm_algo_auth *algp; 65 66 if (!rt) 67 return 0; 68 69 algp = nla_data(rt); 70 if (nla_len(rt) < xfrm_alg_auth_len(algp)) 71 return -EINVAL; 72 73 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; 74 return 0; 75 } 76 77 static int verify_aead(struct nlattr **attrs) 78 { 79 struct nlattr *rt = attrs[XFRMA_ALG_AEAD]; 80 struct xfrm_algo_aead *algp; 81 82 if (!rt) 83 return 0; 84 85 algp = nla_data(rt); 86 if (nla_len(rt) < aead_len(algp)) 87 return -EINVAL; 88 89 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; 90 return 0; 91 } 92 93 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type, 94 xfrm_address_t **addrp) 95 { 96 struct nlattr *rt = attrs[type]; 97 98 if (rt && addrp) 99 *addrp = nla_data(rt); 100 } 101 102 static inline int verify_sec_ctx_len(struct nlattr **attrs) 103 { 104 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 105 struct xfrm_user_sec_ctx *uctx; 106 107 if (!rt) 108 return 0; 109 110 uctx = nla_data(rt); 111 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len)) 112 return -EINVAL; 113 114 return 0; 115 } 116 117 static inline int verify_replay(struct xfrm_usersa_info *p, 118 struct nlattr **attrs) 119 { 120 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL]; 121 struct xfrm_replay_state_esn *rs; 122 123 if (p->flags & XFRM_STATE_ESN) { 124 if (!rt) 125 return -EINVAL; 126 127 rs = nla_data(rt); 128 129 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8) 130 return -EINVAL; 131 132 if (nla_len(rt) < xfrm_replay_state_esn_len(rs) && 133 nla_len(rt) != sizeof(*rs)) 134 return -EINVAL; 135 } 136 137 if (!rt) 138 return 0; 139 140 /* As only ESP and AH support ESN feature. */ 141 if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH)) 142 return -EINVAL; 143 144 if (p->replay_window != 0) 145 return -EINVAL; 146 147 return 0; 148 } 149 150 static int verify_newsa_info(struct xfrm_usersa_info *p, 151 struct nlattr **attrs) 152 { 153 int err; 154 155 err = -EINVAL; 156 switch (p->family) { 157 case AF_INET: 158 break; 159 160 case AF_INET6: 161 #if IS_ENABLED(CONFIG_IPV6) 162 break; 163 #else 164 err = -EAFNOSUPPORT; 165 goto out; 166 #endif 167 168 default: 169 goto out; 170 } 171 172 err = -EINVAL; 173 switch (p->id.proto) { 174 case IPPROTO_AH: 175 if ((!attrs[XFRMA_ALG_AUTH] && 176 !attrs[XFRMA_ALG_AUTH_TRUNC]) || 177 attrs[XFRMA_ALG_AEAD] || 178 attrs[XFRMA_ALG_CRYPT] || 179 attrs[XFRMA_ALG_COMP] || 180 attrs[XFRMA_TFCPAD]) 181 goto out; 182 break; 183 184 case IPPROTO_ESP: 185 if (attrs[XFRMA_ALG_COMP]) 186 goto out; 187 if (!attrs[XFRMA_ALG_AUTH] && 188 !attrs[XFRMA_ALG_AUTH_TRUNC] && 189 !attrs[XFRMA_ALG_CRYPT] && 190 !attrs[XFRMA_ALG_AEAD]) 191 goto out; 192 if ((attrs[XFRMA_ALG_AUTH] || 193 attrs[XFRMA_ALG_AUTH_TRUNC] || 194 attrs[XFRMA_ALG_CRYPT]) && 195 attrs[XFRMA_ALG_AEAD]) 196 goto out; 197 if (attrs[XFRMA_TFCPAD] && 198 p->mode != XFRM_MODE_TUNNEL) 199 goto out; 200 break; 201 202 case IPPROTO_COMP: 203 if (!attrs[XFRMA_ALG_COMP] || 204 attrs[XFRMA_ALG_AEAD] || 205 attrs[XFRMA_ALG_AUTH] || 206 attrs[XFRMA_ALG_AUTH_TRUNC] || 207 attrs[XFRMA_ALG_CRYPT] || 208 attrs[XFRMA_TFCPAD] || 209 (ntohl(p->id.spi) >= 0x10000)) 210 goto out; 211 break; 212 213 #if IS_ENABLED(CONFIG_IPV6) 214 case IPPROTO_DSTOPTS: 215 case IPPROTO_ROUTING: 216 if (attrs[XFRMA_ALG_COMP] || 217 attrs[XFRMA_ALG_AUTH] || 218 attrs[XFRMA_ALG_AUTH_TRUNC] || 219 attrs[XFRMA_ALG_AEAD] || 220 attrs[XFRMA_ALG_CRYPT] || 221 attrs[XFRMA_ENCAP] || 222 attrs[XFRMA_SEC_CTX] || 223 attrs[XFRMA_TFCPAD] || 224 !attrs[XFRMA_COADDR]) 225 goto out; 226 break; 227 #endif 228 229 default: 230 goto out; 231 } 232 233 if ((err = verify_aead(attrs))) 234 goto out; 235 if ((err = verify_auth_trunc(attrs))) 236 goto out; 237 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH))) 238 goto out; 239 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT))) 240 goto out; 241 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP))) 242 goto out; 243 if ((err = verify_sec_ctx_len(attrs))) 244 goto out; 245 if ((err = verify_replay(p, attrs))) 246 goto out; 247 248 err = -EINVAL; 249 switch (p->mode) { 250 case XFRM_MODE_TRANSPORT: 251 case XFRM_MODE_TUNNEL: 252 case XFRM_MODE_ROUTEOPTIMIZATION: 253 case XFRM_MODE_BEET: 254 break; 255 256 default: 257 goto out; 258 } 259 260 err = 0; 261 262 out: 263 return err; 264 } 265 266 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props, 267 struct xfrm_algo_desc *(*get_byname)(const char *, int), 268 struct nlattr *rta) 269 { 270 struct xfrm_algo *p, *ualg; 271 struct xfrm_algo_desc *algo; 272 273 if (!rta) 274 return 0; 275 276 ualg = nla_data(rta); 277 278 algo = get_byname(ualg->alg_name, 1); 279 if (!algo) 280 return -ENOSYS; 281 *props = algo->desc.sadb_alg_id; 282 283 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL); 284 if (!p) 285 return -ENOMEM; 286 287 strcpy(p->alg_name, algo->name); 288 *algpp = p; 289 return 0; 290 } 291 292 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props, 293 struct nlattr *rta) 294 { 295 struct xfrm_algo *ualg; 296 struct xfrm_algo_auth *p; 297 struct xfrm_algo_desc *algo; 298 299 if (!rta) 300 return 0; 301 302 ualg = nla_data(rta); 303 304 algo = xfrm_aalg_get_byname(ualg->alg_name, 1); 305 if (!algo) 306 return -ENOSYS; 307 *props = algo->desc.sadb_alg_id; 308 309 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL); 310 if (!p) 311 return -ENOMEM; 312 313 strcpy(p->alg_name, algo->name); 314 p->alg_key_len = ualg->alg_key_len; 315 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; 316 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8); 317 318 *algpp = p; 319 return 0; 320 } 321 322 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props, 323 struct nlattr *rta) 324 { 325 struct xfrm_algo_auth *p, *ualg; 326 struct xfrm_algo_desc *algo; 327 328 if (!rta) 329 return 0; 330 331 ualg = nla_data(rta); 332 333 algo = xfrm_aalg_get_byname(ualg->alg_name, 1); 334 if (!algo) 335 return -ENOSYS; 336 if ((ualg->alg_trunc_len / 8) > MAX_AH_AUTH_LEN || 337 ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits) 338 return -EINVAL; 339 *props = algo->desc.sadb_alg_id; 340 341 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL); 342 if (!p) 343 return -ENOMEM; 344 345 strcpy(p->alg_name, algo->name); 346 if (!p->alg_trunc_len) 347 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; 348 349 *algpp = p; 350 return 0; 351 } 352 353 static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props, 354 struct nlattr *rta) 355 { 356 struct xfrm_algo_aead *p, *ualg; 357 struct xfrm_algo_desc *algo; 358 359 if (!rta) 360 return 0; 361 362 ualg = nla_data(rta); 363 364 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1); 365 if (!algo) 366 return -ENOSYS; 367 *props = algo->desc.sadb_alg_id; 368 369 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL); 370 if (!p) 371 return -ENOMEM; 372 373 strcpy(p->alg_name, algo->name); 374 *algpp = p; 375 return 0; 376 } 377 378 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn, 379 struct nlattr *rp) 380 { 381 struct xfrm_replay_state_esn *up; 382 int ulen; 383 384 if (!replay_esn || !rp) 385 return 0; 386 387 up = nla_data(rp); 388 ulen = xfrm_replay_state_esn_len(up); 389 390 if (nla_len(rp) < ulen || xfrm_replay_state_esn_len(replay_esn) != ulen) 391 return -EINVAL; 392 393 return 0; 394 } 395 396 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn, 397 struct xfrm_replay_state_esn **preplay_esn, 398 struct nlattr *rta) 399 { 400 struct xfrm_replay_state_esn *p, *pp, *up; 401 int klen, ulen; 402 403 if (!rta) 404 return 0; 405 406 up = nla_data(rta); 407 klen = xfrm_replay_state_esn_len(up); 408 ulen = nla_len(rta) >= klen ? klen : sizeof(*up); 409 410 p = kzalloc(klen, GFP_KERNEL); 411 if (!p) 412 return -ENOMEM; 413 414 pp = kzalloc(klen, GFP_KERNEL); 415 if (!pp) { 416 kfree(p); 417 return -ENOMEM; 418 } 419 420 memcpy(p, up, ulen); 421 memcpy(pp, up, ulen); 422 423 *replay_esn = p; 424 *preplay_esn = pp; 425 426 return 0; 427 } 428 429 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx) 430 { 431 int len = 0; 432 433 if (xfrm_ctx) { 434 len += sizeof(struct xfrm_user_sec_ctx); 435 len += xfrm_ctx->ctx_len; 436 } 437 return len; 438 } 439 440 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 441 { 442 memcpy(&x->id, &p->id, sizeof(x->id)); 443 memcpy(&x->sel, &p->sel, sizeof(x->sel)); 444 memcpy(&x->lft, &p->lft, sizeof(x->lft)); 445 x->props.mode = p->mode; 446 x->props.replay_window = min_t(unsigned int, p->replay_window, 447 sizeof(x->replay.bitmap) * 8); 448 x->props.reqid = p->reqid; 449 x->props.family = p->family; 450 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr)); 451 x->props.flags = p->flags; 452 453 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC)) 454 x->sel.family = p->family; 455 } 456 457 /* 458 * someday when pfkey also has support, we could have the code 459 * somehow made shareable and move it to xfrm_state.c - JHS 460 * 461 */ 462 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs, 463 int update_esn) 464 { 465 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 466 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL; 467 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 468 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; 469 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; 470 471 if (re) { 472 struct xfrm_replay_state_esn *replay_esn; 473 replay_esn = nla_data(re); 474 memcpy(x->replay_esn, replay_esn, 475 xfrm_replay_state_esn_len(replay_esn)); 476 memcpy(x->preplay_esn, replay_esn, 477 xfrm_replay_state_esn_len(replay_esn)); 478 } 479 480 if (rp) { 481 struct xfrm_replay_state *replay; 482 replay = nla_data(rp); 483 memcpy(&x->replay, replay, sizeof(*replay)); 484 memcpy(&x->preplay, replay, sizeof(*replay)); 485 } 486 487 if (lt) { 488 struct xfrm_lifetime_cur *ltime; 489 ltime = nla_data(lt); 490 x->curlft.bytes = ltime->bytes; 491 x->curlft.packets = ltime->packets; 492 x->curlft.add_time = ltime->add_time; 493 x->curlft.use_time = ltime->use_time; 494 } 495 496 if (et) 497 x->replay_maxage = nla_get_u32(et); 498 499 if (rt) 500 x->replay_maxdiff = nla_get_u32(rt); 501 } 502 503 static struct xfrm_state *xfrm_state_construct(struct net *net, 504 struct xfrm_usersa_info *p, 505 struct nlattr **attrs, 506 int *errp) 507 { 508 struct xfrm_state *x = xfrm_state_alloc(net); 509 int err = -ENOMEM; 510 511 if (!x) 512 goto error_no_put; 513 514 copy_from_user_state(x, p); 515 516 if (attrs[XFRMA_SA_EXTRA_FLAGS]) 517 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]); 518 519 if ((err = attach_aead(&x->aead, &x->props.ealgo, 520 attrs[XFRMA_ALG_AEAD]))) 521 goto error; 522 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo, 523 attrs[XFRMA_ALG_AUTH_TRUNC]))) 524 goto error; 525 if (!x->props.aalgo) { 526 if ((err = attach_auth(&x->aalg, &x->props.aalgo, 527 attrs[XFRMA_ALG_AUTH]))) 528 goto error; 529 } 530 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo, 531 xfrm_ealg_get_byname, 532 attrs[XFRMA_ALG_CRYPT]))) 533 goto error; 534 if ((err = attach_one_algo(&x->calg, &x->props.calgo, 535 xfrm_calg_get_byname, 536 attrs[XFRMA_ALG_COMP]))) 537 goto error; 538 539 if (attrs[XFRMA_ENCAP]) { 540 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]), 541 sizeof(*x->encap), GFP_KERNEL); 542 if (x->encap == NULL) 543 goto error; 544 } 545 546 if (attrs[XFRMA_TFCPAD]) 547 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]); 548 549 if (attrs[XFRMA_COADDR]) { 550 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]), 551 sizeof(*x->coaddr), GFP_KERNEL); 552 if (x->coaddr == NULL) 553 goto error; 554 } 555 556 xfrm_mark_get(attrs, &x->mark); 557 558 err = __xfrm_init_state(x, false); 559 if (err) 560 goto error; 561 562 if (attrs[XFRMA_SEC_CTX] && 563 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX]))) 564 goto error; 565 566 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn, 567 attrs[XFRMA_REPLAY_ESN_VAL]))) 568 goto error; 569 570 x->km.seq = p->seq; 571 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth; 572 /* sysctl_xfrm_aevent_etime is in 100ms units */ 573 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M; 574 575 if ((err = xfrm_init_replay(x))) 576 goto error; 577 578 /* override default values from above */ 579 xfrm_update_ae_params(x, attrs, 0); 580 581 return x; 582 583 error: 584 x->km.state = XFRM_STATE_DEAD; 585 xfrm_state_put(x); 586 error_no_put: 587 *errp = err; 588 return NULL; 589 } 590 591 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 592 struct nlattr **attrs) 593 { 594 struct net *net = sock_net(skb->sk); 595 struct xfrm_usersa_info *p = nlmsg_data(nlh); 596 struct xfrm_state *x; 597 int err; 598 struct km_event c; 599 600 err = verify_newsa_info(p, attrs); 601 if (err) 602 return err; 603 604 x = xfrm_state_construct(net, p, attrs, &err); 605 if (!x) 606 return err; 607 608 xfrm_state_hold(x); 609 if (nlh->nlmsg_type == XFRM_MSG_NEWSA) 610 err = xfrm_state_add(x); 611 else 612 err = xfrm_state_update(x); 613 614 xfrm_audit_state_add(x, err ? 0 : 1, true); 615 616 if (err < 0) { 617 x->km.state = XFRM_STATE_DEAD; 618 __xfrm_state_put(x); 619 goto out; 620 } 621 622 c.seq = nlh->nlmsg_seq; 623 c.portid = nlh->nlmsg_pid; 624 c.event = nlh->nlmsg_type; 625 626 km_state_notify(x, &c); 627 out: 628 xfrm_state_put(x); 629 return err; 630 } 631 632 static struct xfrm_state *xfrm_user_state_lookup(struct net *net, 633 struct xfrm_usersa_id *p, 634 struct nlattr **attrs, 635 int *errp) 636 { 637 struct xfrm_state *x = NULL; 638 struct xfrm_mark m; 639 int err; 640 u32 mark = xfrm_mark_get(attrs, &m); 641 642 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) { 643 err = -ESRCH; 644 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family); 645 } else { 646 xfrm_address_t *saddr = NULL; 647 648 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr); 649 if (!saddr) { 650 err = -EINVAL; 651 goto out; 652 } 653 654 err = -ESRCH; 655 x = xfrm_state_lookup_byaddr(net, mark, 656 &p->daddr, saddr, 657 p->proto, p->family); 658 } 659 660 out: 661 if (!x && errp) 662 *errp = err; 663 return x; 664 } 665 666 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 667 struct nlattr **attrs) 668 { 669 struct net *net = sock_net(skb->sk); 670 struct xfrm_state *x; 671 int err = -ESRCH; 672 struct km_event c; 673 struct xfrm_usersa_id *p = nlmsg_data(nlh); 674 675 x = xfrm_user_state_lookup(net, p, attrs, &err); 676 if (x == NULL) 677 return err; 678 679 if ((err = security_xfrm_state_delete(x)) != 0) 680 goto out; 681 682 if (xfrm_state_kern(x)) { 683 err = -EPERM; 684 goto out; 685 } 686 687 err = xfrm_state_delete(x); 688 689 if (err < 0) 690 goto out; 691 692 c.seq = nlh->nlmsg_seq; 693 c.portid = nlh->nlmsg_pid; 694 c.event = nlh->nlmsg_type; 695 km_state_notify(x, &c); 696 697 out: 698 xfrm_audit_state_delete(x, err ? 0 : 1, true); 699 xfrm_state_put(x); 700 return err; 701 } 702 703 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 704 { 705 memset(p, 0, sizeof(*p)); 706 memcpy(&p->id, &x->id, sizeof(p->id)); 707 memcpy(&p->sel, &x->sel, sizeof(p->sel)); 708 memcpy(&p->lft, &x->lft, sizeof(p->lft)); 709 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft)); 710 memcpy(&p->stats, &x->stats, sizeof(p->stats)); 711 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr)); 712 p->mode = x->props.mode; 713 p->replay_window = x->props.replay_window; 714 p->reqid = x->props.reqid; 715 p->family = x->props.family; 716 p->flags = x->props.flags; 717 p->seq = x->km.seq; 718 } 719 720 struct xfrm_dump_info { 721 struct sk_buff *in_skb; 722 struct sk_buff *out_skb; 723 u32 nlmsg_seq; 724 u16 nlmsg_flags; 725 }; 726 727 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb) 728 { 729 struct xfrm_user_sec_ctx *uctx; 730 struct nlattr *attr; 731 int ctx_size = sizeof(*uctx) + s->ctx_len; 732 733 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size); 734 if (attr == NULL) 735 return -EMSGSIZE; 736 737 uctx = nla_data(attr); 738 uctx->exttype = XFRMA_SEC_CTX; 739 uctx->len = ctx_size; 740 uctx->ctx_doi = s->ctx_doi; 741 uctx->ctx_alg = s->ctx_alg; 742 uctx->ctx_len = s->ctx_len; 743 memcpy(uctx + 1, s->ctx_str, s->ctx_len); 744 745 return 0; 746 } 747 748 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb) 749 { 750 struct xfrm_algo *algo; 751 struct nlattr *nla; 752 753 nla = nla_reserve(skb, XFRMA_ALG_AUTH, 754 sizeof(*algo) + (auth->alg_key_len + 7) / 8); 755 if (!nla) 756 return -EMSGSIZE; 757 758 algo = nla_data(nla); 759 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name)); 760 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8); 761 algo->alg_key_len = auth->alg_key_len; 762 763 return 0; 764 } 765 766 /* Don't change this without updating xfrm_sa_len! */ 767 static int copy_to_user_state_extra(struct xfrm_state *x, 768 struct xfrm_usersa_info *p, 769 struct sk_buff *skb) 770 { 771 int ret = 0; 772 773 copy_to_user_state(x, p); 774 775 if (x->props.extra_flags) { 776 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS, 777 x->props.extra_flags); 778 if (ret) 779 goto out; 780 } 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 struct sock *sk = cb->skb->sk; 870 struct net *net = sock_net(sk); 871 872 xfrm_state_walk_done(walk, net); 873 return 0; 874 } 875 876 static const struct nla_policy xfrma_policy[XFRMA_MAX+1]; 877 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb) 878 { 879 struct net *net = sock_net(skb->sk); 880 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 881 struct xfrm_dump_info info; 882 883 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) > 884 sizeof(cb->args) - sizeof(cb->args[0])); 885 886 info.in_skb = cb->skb; 887 info.out_skb = skb; 888 info.nlmsg_seq = cb->nlh->nlmsg_seq; 889 info.nlmsg_flags = NLM_F_MULTI; 890 891 if (!cb->args[0]) { 892 struct nlattr *attrs[XFRMA_MAX+1]; 893 struct xfrm_address_filter *filter = NULL; 894 u8 proto = 0; 895 int err; 896 897 cb->args[0] = 1; 898 899 err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX, 900 xfrma_policy); 901 if (err < 0) 902 return err; 903 904 if (attrs[XFRMA_ADDRESS_FILTER]) { 905 filter = kmalloc(sizeof(*filter), GFP_KERNEL); 906 if (filter == NULL) 907 return -ENOMEM; 908 909 memcpy(filter, nla_data(attrs[XFRMA_ADDRESS_FILTER]), 910 sizeof(*filter)); 911 } 912 913 if (attrs[XFRMA_PROTO]) 914 proto = nla_get_u8(attrs[XFRMA_PROTO]); 915 916 xfrm_state_walk_init(walk, proto, filter); 917 } 918 919 (void) xfrm_state_walk(net, walk, dump_one_state, &info); 920 921 return skb->len; 922 } 923 924 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb, 925 struct xfrm_state *x, u32 seq) 926 { 927 struct xfrm_dump_info info; 928 struct sk_buff *skb; 929 int err; 930 931 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 932 if (!skb) 933 return ERR_PTR(-ENOMEM); 934 935 info.in_skb = in_skb; 936 info.out_skb = skb; 937 info.nlmsg_seq = seq; 938 info.nlmsg_flags = 0; 939 940 err = dump_one_state(x, 0, &info); 941 if (err) { 942 kfree_skb(skb); 943 return ERR_PTR(err); 944 } 945 946 return skb; 947 } 948 949 /* A wrapper for nlmsg_multicast() checking that nlsk is still available. 950 * Must be called with RCU read lock. 951 */ 952 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb, 953 u32 pid, unsigned int group) 954 { 955 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk); 956 957 if (nlsk) 958 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC); 959 else 960 return -1; 961 } 962 963 static inline size_t xfrm_spdinfo_msgsize(void) 964 { 965 return NLMSG_ALIGN(4) 966 + nla_total_size(sizeof(struct xfrmu_spdinfo)) 967 + nla_total_size(sizeof(struct xfrmu_spdhinfo)); 968 } 969 970 static int build_spdinfo(struct sk_buff *skb, struct net *net, 971 u32 portid, u32 seq, u32 flags) 972 { 973 struct xfrmk_spdinfo si; 974 struct xfrmu_spdinfo spc; 975 struct xfrmu_spdhinfo sph; 976 struct nlmsghdr *nlh; 977 int err; 978 u32 *f; 979 980 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0); 981 if (nlh == NULL) /* shouldn't really happen ... */ 982 return -EMSGSIZE; 983 984 f = nlmsg_data(nlh); 985 *f = flags; 986 xfrm_spd_getinfo(net, &si); 987 spc.incnt = si.incnt; 988 spc.outcnt = si.outcnt; 989 spc.fwdcnt = si.fwdcnt; 990 spc.inscnt = si.inscnt; 991 spc.outscnt = si.outscnt; 992 spc.fwdscnt = si.fwdscnt; 993 sph.spdhcnt = si.spdhcnt; 994 sph.spdhmcnt = si.spdhmcnt; 995 996 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc); 997 if (!err) 998 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph); 999 if (err) { 1000 nlmsg_cancel(skb, nlh); 1001 return err; 1002 } 1003 1004 return nlmsg_end(skb, nlh); 1005 } 1006 1007 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1008 struct nlattr **attrs) 1009 { 1010 struct net *net = sock_net(skb->sk); 1011 struct sk_buff *r_skb; 1012 u32 *flags = nlmsg_data(nlh); 1013 u32 sportid = NETLINK_CB(skb).portid; 1014 u32 seq = nlh->nlmsg_seq; 1015 1016 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC); 1017 if (r_skb == NULL) 1018 return -ENOMEM; 1019 1020 if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0) 1021 BUG(); 1022 1023 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); 1024 } 1025 1026 static inline size_t xfrm_sadinfo_msgsize(void) 1027 { 1028 return NLMSG_ALIGN(4) 1029 + nla_total_size(sizeof(struct xfrmu_sadhinfo)) 1030 + nla_total_size(4); /* XFRMA_SAD_CNT */ 1031 } 1032 1033 static int build_sadinfo(struct sk_buff *skb, struct net *net, 1034 u32 portid, u32 seq, u32 flags) 1035 { 1036 struct xfrmk_sadinfo si; 1037 struct xfrmu_sadhinfo sh; 1038 struct nlmsghdr *nlh; 1039 int err; 1040 u32 *f; 1041 1042 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0); 1043 if (nlh == NULL) /* shouldn't really happen ... */ 1044 return -EMSGSIZE; 1045 1046 f = nlmsg_data(nlh); 1047 *f = flags; 1048 xfrm_sad_getinfo(net, &si); 1049 1050 sh.sadhmcnt = si.sadhmcnt; 1051 sh.sadhcnt = si.sadhcnt; 1052 1053 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt); 1054 if (!err) 1055 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh); 1056 if (err) { 1057 nlmsg_cancel(skb, nlh); 1058 return err; 1059 } 1060 1061 return nlmsg_end(skb, nlh); 1062 } 1063 1064 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1065 struct nlattr **attrs) 1066 { 1067 struct net *net = sock_net(skb->sk); 1068 struct sk_buff *r_skb; 1069 u32 *flags = nlmsg_data(nlh); 1070 u32 sportid = NETLINK_CB(skb).portid; 1071 u32 seq = nlh->nlmsg_seq; 1072 1073 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC); 1074 if (r_skb == NULL) 1075 return -ENOMEM; 1076 1077 if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0) 1078 BUG(); 1079 1080 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); 1081 } 1082 1083 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 1084 struct nlattr **attrs) 1085 { 1086 struct net *net = sock_net(skb->sk); 1087 struct xfrm_usersa_id *p = nlmsg_data(nlh); 1088 struct xfrm_state *x; 1089 struct sk_buff *resp_skb; 1090 int err = -ESRCH; 1091 1092 x = xfrm_user_state_lookup(net, p, attrs, &err); 1093 if (x == NULL) 1094 goto out_noput; 1095 1096 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 1097 if (IS_ERR(resp_skb)) { 1098 err = PTR_ERR(resp_skb); 1099 } else { 1100 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); 1101 } 1102 xfrm_state_put(x); 1103 out_noput: 1104 return err; 1105 } 1106 1107 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, 1108 struct nlattr **attrs) 1109 { 1110 struct net *net = sock_net(skb->sk); 1111 struct xfrm_state *x; 1112 struct xfrm_userspi_info *p; 1113 struct sk_buff *resp_skb; 1114 xfrm_address_t *daddr; 1115 int family; 1116 int err; 1117 u32 mark; 1118 struct xfrm_mark m; 1119 1120 p = nlmsg_data(nlh); 1121 err = verify_spi_info(p->info.id.proto, p->min, p->max); 1122 if (err) 1123 goto out_noput; 1124 1125 family = p->info.family; 1126 daddr = &p->info.id.daddr; 1127 1128 x = NULL; 1129 1130 mark = xfrm_mark_get(attrs, &m); 1131 if (p->info.seq) { 1132 x = xfrm_find_acq_byseq(net, mark, p->info.seq); 1133 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) { 1134 xfrm_state_put(x); 1135 x = NULL; 1136 } 1137 } 1138 1139 if (!x) 1140 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid, 1141 p->info.id.proto, daddr, 1142 &p->info.saddr, 1, 1143 family); 1144 err = -ENOENT; 1145 if (x == NULL) 1146 goto out_noput; 1147 1148 err = xfrm_alloc_spi(x, p->min, p->max); 1149 if (err) 1150 goto out; 1151 1152 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 1153 if (IS_ERR(resp_skb)) { 1154 err = PTR_ERR(resp_skb); 1155 goto out; 1156 } 1157 1158 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); 1159 1160 out: 1161 xfrm_state_put(x); 1162 out_noput: 1163 return err; 1164 } 1165 1166 static int verify_policy_dir(u8 dir) 1167 { 1168 switch (dir) { 1169 case XFRM_POLICY_IN: 1170 case XFRM_POLICY_OUT: 1171 case XFRM_POLICY_FWD: 1172 break; 1173 1174 default: 1175 return -EINVAL; 1176 } 1177 1178 return 0; 1179 } 1180 1181 static int verify_policy_type(u8 type) 1182 { 1183 switch (type) { 1184 case XFRM_POLICY_TYPE_MAIN: 1185 #ifdef CONFIG_XFRM_SUB_POLICY 1186 case XFRM_POLICY_TYPE_SUB: 1187 #endif 1188 break; 1189 1190 default: 1191 return -EINVAL; 1192 } 1193 1194 return 0; 1195 } 1196 1197 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p) 1198 { 1199 int ret; 1200 1201 switch (p->share) { 1202 case XFRM_SHARE_ANY: 1203 case XFRM_SHARE_SESSION: 1204 case XFRM_SHARE_USER: 1205 case XFRM_SHARE_UNIQUE: 1206 break; 1207 1208 default: 1209 return -EINVAL; 1210 } 1211 1212 switch (p->action) { 1213 case XFRM_POLICY_ALLOW: 1214 case XFRM_POLICY_BLOCK: 1215 break; 1216 1217 default: 1218 return -EINVAL; 1219 } 1220 1221 switch (p->sel.family) { 1222 case AF_INET: 1223 break; 1224 1225 case AF_INET6: 1226 #if IS_ENABLED(CONFIG_IPV6) 1227 break; 1228 #else 1229 return -EAFNOSUPPORT; 1230 #endif 1231 1232 default: 1233 return -EINVAL; 1234 } 1235 1236 ret = verify_policy_dir(p->dir); 1237 if (ret) 1238 return ret; 1239 if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir)) 1240 return -EINVAL; 1241 1242 return 0; 1243 } 1244 1245 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs) 1246 { 1247 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1248 struct xfrm_user_sec_ctx *uctx; 1249 1250 if (!rt) 1251 return 0; 1252 1253 uctx = nla_data(rt); 1254 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL); 1255 } 1256 1257 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut, 1258 int nr) 1259 { 1260 int i; 1261 1262 xp->xfrm_nr = nr; 1263 for (i = 0; i < nr; i++, ut++) { 1264 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 1265 1266 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id)); 1267 memcpy(&t->saddr, &ut->saddr, 1268 sizeof(xfrm_address_t)); 1269 t->reqid = ut->reqid; 1270 t->mode = ut->mode; 1271 t->share = ut->share; 1272 t->optional = ut->optional; 1273 t->aalgos = ut->aalgos; 1274 t->ealgos = ut->ealgos; 1275 t->calgos = ut->calgos; 1276 /* If all masks are ~0, then we allow all algorithms. */ 1277 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos); 1278 t->encap_family = ut->family; 1279 } 1280 } 1281 1282 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family) 1283 { 1284 int i; 1285 1286 if (nr > XFRM_MAX_DEPTH) 1287 return -EINVAL; 1288 1289 for (i = 0; i < nr; i++) { 1290 /* We never validated the ut->family value, so many 1291 * applications simply leave it at zero. The check was 1292 * never made and ut->family was ignored because all 1293 * templates could be assumed to have the same family as 1294 * the policy itself. Now that we will have ipv4-in-ipv6 1295 * and ipv6-in-ipv4 tunnels, this is no longer true. 1296 */ 1297 if (!ut[i].family) 1298 ut[i].family = family; 1299 1300 switch (ut[i].family) { 1301 case AF_INET: 1302 break; 1303 #if IS_ENABLED(CONFIG_IPV6) 1304 case AF_INET6: 1305 break; 1306 #endif 1307 default: 1308 return -EINVAL; 1309 } 1310 } 1311 1312 return 0; 1313 } 1314 1315 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs) 1316 { 1317 struct nlattr *rt = attrs[XFRMA_TMPL]; 1318 1319 if (!rt) { 1320 pol->xfrm_nr = 0; 1321 } else { 1322 struct xfrm_user_tmpl *utmpl = nla_data(rt); 1323 int nr = nla_len(rt) / sizeof(*utmpl); 1324 int err; 1325 1326 err = validate_tmpl(nr, utmpl, pol->family); 1327 if (err) 1328 return err; 1329 1330 copy_templates(pol, utmpl, nr); 1331 } 1332 return 0; 1333 } 1334 1335 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs) 1336 { 1337 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE]; 1338 struct xfrm_userpolicy_type *upt; 1339 u8 type = XFRM_POLICY_TYPE_MAIN; 1340 int err; 1341 1342 if (rt) { 1343 upt = nla_data(rt); 1344 type = upt->type; 1345 } 1346 1347 err = verify_policy_type(type); 1348 if (err) 1349 return err; 1350 1351 *tp = type; 1352 return 0; 1353 } 1354 1355 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p) 1356 { 1357 xp->priority = p->priority; 1358 xp->index = p->index; 1359 memcpy(&xp->selector, &p->sel, sizeof(xp->selector)); 1360 memcpy(&xp->lft, &p->lft, sizeof(xp->lft)); 1361 xp->action = p->action; 1362 xp->flags = p->flags; 1363 xp->family = p->sel.family; 1364 /* XXX xp->share = p->share; */ 1365 } 1366 1367 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir) 1368 { 1369 memset(p, 0, sizeof(*p)); 1370 memcpy(&p->sel, &xp->selector, sizeof(p->sel)); 1371 memcpy(&p->lft, &xp->lft, sizeof(p->lft)); 1372 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft)); 1373 p->priority = xp->priority; 1374 p->index = xp->index; 1375 p->sel.family = xp->family; 1376 p->dir = dir; 1377 p->action = xp->action; 1378 p->flags = xp->flags; 1379 p->share = XFRM_SHARE_ANY; /* XXX xp->share */ 1380 } 1381 1382 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp) 1383 { 1384 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL); 1385 int err; 1386 1387 if (!xp) { 1388 *errp = -ENOMEM; 1389 return NULL; 1390 } 1391 1392 copy_from_user_policy(xp, p); 1393 1394 err = copy_from_user_policy_type(&xp->type, attrs); 1395 if (err) 1396 goto error; 1397 1398 if (!(err = copy_from_user_tmpl(xp, attrs))) 1399 err = copy_from_user_sec_ctx(xp, attrs); 1400 if (err) 1401 goto error; 1402 1403 xfrm_mark_get(attrs, &xp->mark); 1404 1405 return xp; 1406 error: 1407 *errp = err; 1408 xp->walk.dead = 1; 1409 xfrm_policy_destroy(xp); 1410 return NULL; 1411 } 1412 1413 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1414 struct nlattr **attrs) 1415 { 1416 struct net *net = sock_net(skb->sk); 1417 struct xfrm_userpolicy_info *p = nlmsg_data(nlh); 1418 struct xfrm_policy *xp; 1419 struct km_event c; 1420 int err; 1421 int excl; 1422 1423 err = verify_newpolicy_info(p); 1424 if (err) 1425 return err; 1426 err = verify_sec_ctx_len(attrs); 1427 if (err) 1428 return err; 1429 1430 xp = xfrm_policy_construct(net, p, attrs, &err); 1431 if (!xp) 1432 return err; 1433 1434 /* shouldn't excl be based on nlh flags?? 1435 * Aha! this is anti-netlink really i.e more pfkey derived 1436 * in netlink excl is a flag and you wouldnt need 1437 * a type XFRM_MSG_UPDPOLICY - JHS */ 1438 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY; 1439 err = xfrm_policy_insert(p->dir, xp, excl); 1440 xfrm_audit_policy_add(xp, err ? 0 : 1, true); 1441 1442 if (err) { 1443 security_xfrm_policy_free(xp->security); 1444 kfree(xp); 1445 return err; 1446 } 1447 1448 c.event = nlh->nlmsg_type; 1449 c.seq = nlh->nlmsg_seq; 1450 c.portid = nlh->nlmsg_pid; 1451 km_policy_notify(xp, p->dir, &c); 1452 1453 xfrm_pol_put(xp); 1454 1455 return 0; 1456 } 1457 1458 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb) 1459 { 1460 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH]; 1461 int i; 1462 1463 if (xp->xfrm_nr == 0) 1464 return 0; 1465 1466 for (i = 0; i < xp->xfrm_nr; i++) { 1467 struct xfrm_user_tmpl *up = &vec[i]; 1468 struct xfrm_tmpl *kp = &xp->xfrm_vec[i]; 1469 1470 memset(up, 0, sizeof(*up)); 1471 memcpy(&up->id, &kp->id, sizeof(up->id)); 1472 up->family = kp->encap_family; 1473 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr)); 1474 up->reqid = kp->reqid; 1475 up->mode = kp->mode; 1476 up->share = kp->share; 1477 up->optional = kp->optional; 1478 up->aalgos = kp->aalgos; 1479 up->ealgos = kp->ealgos; 1480 up->calgos = kp->calgos; 1481 } 1482 1483 return nla_put(skb, XFRMA_TMPL, 1484 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec); 1485 } 1486 1487 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb) 1488 { 1489 if (x->security) { 1490 return copy_sec_ctx(x->security, skb); 1491 } 1492 return 0; 1493 } 1494 1495 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb) 1496 { 1497 if (xp->security) 1498 return copy_sec_ctx(xp->security, skb); 1499 return 0; 1500 } 1501 static inline size_t userpolicy_type_attrsize(void) 1502 { 1503 #ifdef CONFIG_XFRM_SUB_POLICY 1504 return nla_total_size(sizeof(struct xfrm_userpolicy_type)); 1505 #else 1506 return 0; 1507 #endif 1508 } 1509 1510 #ifdef CONFIG_XFRM_SUB_POLICY 1511 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1512 { 1513 struct xfrm_userpolicy_type upt = { 1514 .type = type, 1515 }; 1516 1517 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt); 1518 } 1519 1520 #else 1521 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1522 { 1523 return 0; 1524 } 1525 #endif 1526 1527 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr) 1528 { 1529 struct xfrm_dump_info *sp = ptr; 1530 struct xfrm_userpolicy_info *p; 1531 struct sk_buff *in_skb = sp->in_skb; 1532 struct sk_buff *skb = sp->out_skb; 1533 struct nlmsghdr *nlh; 1534 int err; 1535 1536 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, 1537 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags); 1538 if (nlh == NULL) 1539 return -EMSGSIZE; 1540 1541 p = nlmsg_data(nlh); 1542 copy_to_user_policy(xp, p, dir); 1543 err = copy_to_user_tmpl(xp, skb); 1544 if (!err) 1545 err = copy_to_user_sec_ctx(xp, skb); 1546 if (!err) 1547 err = copy_to_user_policy_type(xp->type, skb); 1548 if (!err) 1549 err = xfrm_mark_put(skb, &xp->mark); 1550 if (err) { 1551 nlmsg_cancel(skb, nlh); 1552 return err; 1553 } 1554 nlmsg_end(skb, nlh); 1555 return 0; 1556 } 1557 1558 static int xfrm_dump_policy_done(struct netlink_callback *cb) 1559 { 1560 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1]; 1561 struct net *net = sock_net(cb->skb->sk); 1562 1563 xfrm_policy_walk_done(walk, net); 1564 return 0; 1565 } 1566 1567 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb) 1568 { 1569 struct net *net = sock_net(skb->sk); 1570 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1]; 1571 struct xfrm_dump_info info; 1572 1573 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) > 1574 sizeof(cb->args) - sizeof(cb->args[0])); 1575 1576 info.in_skb = cb->skb; 1577 info.out_skb = skb; 1578 info.nlmsg_seq = cb->nlh->nlmsg_seq; 1579 info.nlmsg_flags = NLM_F_MULTI; 1580 1581 if (!cb->args[0]) { 1582 cb->args[0] = 1; 1583 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY); 1584 } 1585 1586 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info); 1587 1588 return skb->len; 1589 } 1590 1591 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb, 1592 struct xfrm_policy *xp, 1593 int dir, u32 seq) 1594 { 1595 struct xfrm_dump_info info; 1596 struct sk_buff *skb; 1597 int err; 1598 1599 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1600 if (!skb) 1601 return ERR_PTR(-ENOMEM); 1602 1603 info.in_skb = in_skb; 1604 info.out_skb = skb; 1605 info.nlmsg_seq = seq; 1606 info.nlmsg_flags = 0; 1607 1608 err = dump_one_policy(xp, dir, 0, &info); 1609 if (err) { 1610 kfree_skb(skb); 1611 return ERR_PTR(err); 1612 } 1613 1614 return skb; 1615 } 1616 1617 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1618 struct nlattr **attrs) 1619 { 1620 struct net *net = sock_net(skb->sk); 1621 struct xfrm_policy *xp; 1622 struct xfrm_userpolicy_id *p; 1623 u8 type = XFRM_POLICY_TYPE_MAIN; 1624 int err; 1625 struct km_event c; 1626 int delete; 1627 struct xfrm_mark m; 1628 u32 mark = xfrm_mark_get(attrs, &m); 1629 1630 p = nlmsg_data(nlh); 1631 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY; 1632 1633 err = copy_from_user_policy_type(&type, attrs); 1634 if (err) 1635 return err; 1636 1637 err = verify_policy_dir(p->dir); 1638 if (err) 1639 return err; 1640 1641 if (p->index) 1642 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err); 1643 else { 1644 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1645 struct xfrm_sec_ctx *ctx; 1646 1647 err = verify_sec_ctx_len(attrs); 1648 if (err) 1649 return err; 1650 1651 ctx = NULL; 1652 if (rt) { 1653 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 1654 1655 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); 1656 if (err) 1657 return err; 1658 } 1659 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel, 1660 ctx, delete, &err); 1661 security_xfrm_policy_free(ctx); 1662 } 1663 if (xp == NULL) 1664 return -ENOENT; 1665 1666 if (!delete) { 1667 struct sk_buff *resp_skb; 1668 1669 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq); 1670 if (IS_ERR(resp_skb)) { 1671 err = PTR_ERR(resp_skb); 1672 } else { 1673 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, 1674 NETLINK_CB(skb).portid); 1675 } 1676 } else { 1677 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 1678 1679 if (err != 0) 1680 goto out; 1681 1682 c.data.byid = p->index; 1683 c.event = nlh->nlmsg_type; 1684 c.seq = nlh->nlmsg_seq; 1685 c.portid = nlh->nlmsg_pid; 1686 km_policy_notify(xp, p->dir, &c); 1687 } 1688 1689 out: 1690 xfrm_pol_put(xp); 1691 if (delete && err == 0) 1692 xfrm_garbage_collect(net); 1693 return err; 1694 } 1695 1696 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 1697 struct nlattr **attrs) 1698 { 1699 struct net *net = sock_net(skb->sk); 1700 struct km_event c; 1701 struct xfrm_usersa_flush *p = nlmsg_data(nlh); 1702 int err; 1703 1704 err = xfrm_state_flush(net, p->proto, true); 1705 if (err) { 1706 if (err == -ESRCH) /* empty table */ 1707 return 0; 1708 return err; 1709 } 1710 c.data.proto = p->proto; 1711 c.event = nlh->nlmsg_type; 1712 c.seq = nlh->nlmsg_seq; 1713 c.portid = nlh->nlmsg_pid; 1714 c.net = net; 1715 km_state_notify(NULL, &c); 1716 1717 return 0; 1718 } 1719 1720 static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x) 1721 { 1722 size_t replay_size = x->replay_esn ? 1723 xfrm_replay_state_esn_len(x->replay_esn) : 1724 sizeof(struct xfrm_replay_state); 1725 1726 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id)) 1727 + nla_total_size(replay_size) 1728 + nla_total_size(sizeof(struct xfrm_lifetime_cur)) 1729 + nla_total_size(sizeof(struct xfrm_mark)) 1730 + nla_total_size(4) /* XFRM_AE_RTHR */ 1731 + nla_total_size(4); /* XFRM_AE_ETHR */ 1732 } 1733 1734 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 1735 { 1736 struct xfrm_aevent_id *id; 1737 struct nlmsghdr *nlh; 1738 int err; 1739 1740 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0); 1741 if (nlh == NULL) 1742 return -EMSGSIZE; 1743 1744 id = nlmsg_data(nlh); 1745 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr)); 1746 id->sa_id.spi = x->id.spi; 1747 id->sa_id.family = x->props.family; 1748 id->sa_id.proto = x->id.proto; 1749 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr)); 1750 id->reqid = x->props.reqid; 1751 id->flags = c->data.aevent; 1752 1753 if (x->replay_esn) { 1754 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL, 1755 xfrm_replay_state_esn_len(x->replay_esn), 1756 x->replay_esn); 1757 } else { 1758 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), 1759 &x->replay); 1760 } 1761 if (err) 1762 goto out_cancel; 1763 err = nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft); 1764 if (err) 1765 goto out_cancel; 1766 1767 if (id->flags & XFRM_AE_RTHR) { 1768 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff); 1769 if (err) 1770 goto out_cancel; 1771 } 1772 if (id->flags & XFRM_AE_ETHR) { 1773 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH, 1774 x->replay_maxage * 10 / HZ); 1775 if (err) 1776 goto out_cancel; 1777 } 1778 err = xfrm_mark_put(skb, &x->mark); 1779 if (err) 1780 goto out_cancel; 1781 1782 return nlmsg_end(skb, nlh); 1783 1784 out_cancel: 1785 nlmsg_cancel(skb, nlh); 1786 return err; 1787 } 1788 1789 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 1790 struct nlattr **attrs) 1791 { 1792 struct net *net = sock_net(skb->sk); 1793 struct xfrm_state *x; 1794 struct sk_buff *r_skb; 1795 int err; 1796 struct km_event c; 1797 u32 mark; 1798 struct xfrm_mark m; 1799 struct xfrm_aevent_id *p = nlmsg_data(nlh); 1800 struct xfrm_usersa_id *id = &p->sa_id; 1801 1802 mark = xfrm_mark_get(attrs, &m); 1803 1804 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family); 1805 if (x == NULL) 1806 return -ESRCH; 1807 1808 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 1809 if (r_skb == NULL) { 1810 xfrm_state_put(x); 1811 return -ENOMEM; 1812 } 1813 1814 /* 1815 * XXX: is this lock really needed - none of the other 1816 * gets lock (the concern is things getting updated 1817 * while we are still reading) - jhs 1818 */ 1819 spin_lock_bh(&x->lock); 1820 c.data.aevent = p->flags; 1821 c.seq = nlh->nlmsg_seq; 1822 c.portid = nlh->nlmsg_pid; 1823 1824 if (build_aevent(r_skb, x, &c) < 0) 1825 BUG(); 1826 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid); 1827 spin_unlock_bh(&x->lock); 1828 xfrm_state_put(x); 1829 return err; 1830 } 1831 1832 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 1833 struct nlattr **attrs) 1834 { 1835 struct net *net = sock_net(skb->sk); 1836 struct xfrm_state *x; 1837 struct km_event c; 1838 int err = -EINVAL; 1839 u32 mark = 0; 1840 struct xfrm_mark m; 1841 struct xfrm_aevent_id *p = nlmsg_data(nlh); 1842 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 1843 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL]; 1844 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 1845 1846 if (!lt && !rp && !re) 1847 return err; 1848 1849 /* pedantic mode - thou shalt sayeth replaceth */ 1850 if (!(nlh->nlmsg_flags&NLM_F_REPLACE)) 1851 return err; 1852 1853 mark = xfrm_mark_get(attrs, &m); 1854 1855 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family); 1856 if (x == NULL) 1857 return -ESRCH; 1858 1859 if (x->km.state != XFRM_STATE_VALID) 1860 goto out; 1861 1862 err = xfrm_replay_verify_len(x->replay_esn, re); 1863 if (err) 1864 goto out; 1865 1866 spin_lock_bh(&x->lock); 1867 xfrm_update_ae_params(x, attrs, 1); 1868 spin_unlock_bh(&x->lock); 1869 1870 c.event = nlh->nlmsg_type; 1871 c.seq = nlh->nlmsg_seq; 1872 c.portid = nlh->nlmsg_pid; 1873 c.data.aevent = XFRM_AE_CU; 1874 km_state_notify(x, &c); 1875 err = 0; 1876 out: 1877 xfrm_state_put(x); 1878 return err; 1879 } 1880 1881 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1882 struct nlattr **attrs) 1883 { 1884 struct net *net = sock_net(skb->sk); 1885 struct km_event c; 1886 u8 type = XFRM_POLICY_TYPE_MAIN; 1887 int err; 1888 1889 err = copy_from_user_policy_type(&type, attrs); 1890 if (err) 1891 return err; 1892 1893 err = xfrm_policy_flush(net, type, true); 1894 if (err) { 1895 if (err == -ESRCH) /* empty table */ 1896 return 0; 1897 return err; 1898 } 1899 1900 c.data.type = type; 1901 c.event = nlh->nlmsg_type; 1902 c.seq = nlh->nlmsg_seq; 1903 c.portid = nlh->nlmsg_pid; 1904 c.net = net; 1905 km_policy_notify(NULL, 0, &c); 1906 return 0; 1907 } 1908 1909 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 1910 struct nlattr **attrs) 1911 { 1912 struct net *net = sock_net(skb->sk); 1913 struct xfrm_policy *xp; 1914 struct xfrm_user_polexpire *up = nlmsg_data(nlh); 1915 struct xfrm_userpolicy_info *p = &up->pol; 1916 u8 type = XFRM_POLICY_TYPE_MAIN; 1917 int err = -ENOENT; 1918 struct xfrm_mark m; 1919 u32 mark = xfrm_mark_get(attrs, &m); 1920 1921 err = copy_from_user_policy_type(&type, attrs); 1922 if (err) 1923 return err; 1924 1925 err = verify_policy_dir(p->dir); 1926 if (err) 1927 return err; 1928 1929 if (p->index) 1930 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err); 1931 else { 1932 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1933 struct xfrm_sec_ctx *ctx; 1934 1935 err = verify_sec_ctx_len(attrs); 1936 if (err) 1937 return err; 1938 1939 ctx = NULL; 1940 if (rt) { 1941 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 1942 1943 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); 1944 if (err) 1945 return err; 1946 } 1947 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, 1948 &p->sel, ctx, 0, &err); 1949 security_xfrm_policy_free(ctx); 1950 } 1951 if (xp == NULL) 1952 return -ENOENT; 1953 1954 if (unlikely(xp->walk.dead)) 1955 goto out; 1956 1957 err = 0; 1958 if (up->hard) { 1959 xfrm_policy_delete(xp, p->dir); 1960 xfrm_audit_policy_delete(xp, 1, true); 1961 } else { 1962 // reset the timers here? 1963 WARN(1, "Dont know what to do with soft policy expire\n"); 1964 } 1965 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid); 1966 1967 out: 1968 xfrm_pol_put(xp); 1969 return err; 1970 } 1971 1972 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 1973 struct nlattr **attrs) 1974 { 1975 struct net *net = sock_net(skb->sk); 1976 struct xfrm_state *x; 1977 int err; 1978 struct xfrm_user_expire *ue = nlmsg_data(nlh); 1979 struct xfrm_usersa_info *p = &ue->state; 1980 struct xfrm_mark m; 1981 u32 mark = xfrm_mark_get(attrs, &m); 1982 1983 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family); 1984 1985 err = -ENOENT; 1986 if (x == NULL) 1987 return err; 1988 1989 spin_lock_bh(&x->lock); 1990 err = -EINVAL; 1991 if (x->km.state != XFRM_STATE_VALID) 1992 goto out; 1993 km_state_expired(x, ue->hard, nlh->nlmsg_pid); 1994 1995 if (ue->hard) { 1996 __xfrm_state_delete(x); 1997 xfrm_audit_state_delete(x, 1, true); 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 struct net *net = sock_net(skb->sk); 2120 2121 if (attrs[XFRMA_MIGRATE] == NULL) 2122 return -EINVAL; 2123 2124 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL; 2125 2126 err = copy_from_user_policy_type(&type, attrs); 2127 if (err) 2128 return err; 2129 2130 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n); 2131 if (err) 2132 return err; 2133 2134 if (!n) 2135 return 0; 2136 2137 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net); 2138 2139 return 0; 2140 } 2141 #else 2142 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 2143 struct nlattr **attrs) 2144 { 2145 return -ENOPROTOOPT; 2146 } 2147 #endif 2148 2149 #ifdef CONFIG_XFRM_MIGRATE 2150 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb) 2151 { 2152 struct xfrm_user_migrate um; 2153 2154 memset(&um, 0, sizeof(um)); 2155 um.proto = m->proto; 2156 um.mode = m->mode; 2157 um.reqid = m->reqid; 2158 um.old_family = m->old_family; 2159 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr)); 2160 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr)); 2161 um.new_family = m->new_family; 2162 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr)); 2163 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr)); 2164 2165 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um); 2166 } 2167 2168 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb) 2169 { 2170 struct xfrm_user_kmaddress uk; 2171 2172 memset(&uk, 0, sizeof(uk)); 2173 uk.family = k->family; 2174 uk.reserved = k->reserved; 2175 memcpy(&uk.local, &k->local, sizeof(uk.local)); 2176 memcpy(&uk.remote, &k->remote, sizeof(uk.remote)); 2177 2178 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk); 2179 } 2180 2181 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma) 2182 { 2183 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id)) 2184 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0) 2185 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate) 2186 + userpolicy_type_attrsize(); 2187 } 2188 2189 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m, 2190 int num_migrate, const struct xfrm_kmaddress *k, 2191 const struct xfrm_selector *sel, u8 dir, u8 type) 2192 { 2193 const struct xfrm_migrate *mp; 2194 struct xfrm_userpolicy_id *pol_id; 2195 struct nlmsghdr *nlh; 2196 int i, err; 2197 2198 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0); 2199 if (nlh == NULL) 2200 return -EMSGSIZE; 2201 2202 pol_id = nlmsg_data(nlh); 2203 /* copy data from selector, dir, and type to the pol_id */ 2204 memset(pol_id, 0, sizeof(*pol_id)); 2205 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel)); 2206 pol_id->dir = dir; 2207 2208 if (k != NULL) { 2209 err = copy_to_user_kmaddress(k, skb); 2210 if (err) 2211 goto out_cancel; 2212 } 2213 err = copy_to_user_policy_type(type, skb); 2214 if (err) 2215 goto out_cancel; 2216 for (i = 0, mp = m ; i < num_migrate; i++, mp++) { 2217 err = copy_to_user_migrate(mp, skb); 2218 if (err) 2219 goto out_cancel; 2220 } 2221 2222 return nlmsg_end(skb, nlh); 2223 2224 out_cancel: 2225 nlmsg_cancel(skb, nlh); 2226 return err; 2227 } 2228 2229 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2230 const struct xfrm_migrate *m, int num_migrate, 2231 const struct xfrm_kmaddress *k) 2232 { 2233 struct net *net = &init_net; 2234 struct sk_buff *skb; 2235 2236 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC); 2237 if (skb == NULL) 2238 return -ENOMEM; 2239 2240 /* build migrate */ 2241 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0) 2242 BUG(); 2243 2244 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE); 2245 } 2246 #else 2247 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2248 const struct xfrm_migrate *m, int num_migrate, 2249 const struct xfrm_kmaddress *k) 2250 { 2251 return -ENOPROTOOPT; 2252 } 2253 #endif 2254 2255 #define XMSGSIZE(type) sizeof(struct type) 2256 2257 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = { 2258 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2259 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2260 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2261 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2262 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2263 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2264 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info), 2265 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire), 2266 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire), 2267 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2268 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2269 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire), 2270 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush), 2271 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0, 2272 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2273 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2274 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report), 2275 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2276 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32), 2277 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 2278 }; 2279 2280 #undef XMSGSIZE 2281 2282 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = { 2283 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)}, 2284 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)}, 2285 [XFRMA_LASTUSED] = { .type = NLA_U64}, 2286 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)}, 2287 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) }, 2288 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) }, 2289 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) }, 2290 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) }, 2291 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) }, 2292 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) }, 2293 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) }, 2294 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) }, 2295 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) }, 2296 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 }, 2297 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 }, 2298 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) }, 2299 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) }, 2300 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)}, 2301 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) }, 2302 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) }, 2303 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) }, 2304 [XFRMA_TFCPAD] = { .type = NLA_U32 }, 2305 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) }, 2306 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 }, 2307 [XFRMA_PROTO] = { .type = NLA_U8 }, 2308 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) }, 2309 }; 2310 2311 static const struct xfrm_link { 2312 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **); 2313 int (*dump)(struct sk_buff *, struct netlink_callback *); 2314 int (*done)(struct netlink_callback *); 2315 } xfrm_dispatch[XFRM_NR_MSGTYPES] = { 2316 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 2317 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa }, 2318 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa, 2319 .dump = xfrm_dump_sa, 2320 .done = xfrm_dump_sa_done }, 2321 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 2322 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy }, 2323 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy, 2324 .dump = xfrm_dump_policy, 2325 .done = xfrm_dump_policy_done }, 2326 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi }, 2327 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire }, 2328 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire }, 2329 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 2330 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 2331 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire}, 2332 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa }, 2333 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy }, 2334 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae }, 2335 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae }, 2336 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate }, 2337 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo }, 2338 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo }, 2339 }; 2340 2341 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 2342 { 2343 struct net *net = sock_net(skb->sk); 2344 struct nlattr *attrs[XFRMA_MAX+1]; 2345 const struct xfrm_link *link; 2346 int type, err; 2347 2348 type = nlh->nlmsg_type; 2349 if (type > XFRM_MSG_MAX) 2350 return -EINVAL; 2351 2352 type -= XFRM_MSG_BASE; 2353 link = &xfrm_dispatch[type]; 2354 2355 /* All operations require privileges, even GET */ 2356 if (!netlink_net_capable(skb, CAP_NET_ADMIN)) 2357 return -EPERM; 2358 2359 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) || 2360 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) && 2361 (nlh->nlmsg_flags & NLM_F_DUMP)) { 2362 if (link->dump == NULL) 2363 return -EINVAL; 2364 2365 { 2366 struct netlink_dump_control c = { 2367 .dump = link->dump, 2368 .done = link->done, 2369 }; 2370 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c); 2371 } 2372 } 2373 2374 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX, 2375 xfrma_policy); 2376 if (err < 0) 2377 return err; 2378 2379 if (link->doit == NULL) 2380 return -EINVAL; 2381 2382 return link->doit(skb, nlh, attrs); 2383 } 2384 2385 static void xfrm_netlink_rcv(struct sk_buff *skb) 2386 { 2387 struct net *net = sock_net(skb->sk); 2388 2389 mutex_lock(&net->xfrm.xfrm_cfg_mutex); 2390 netlink_rcv_skb(skb, &xfrm_user_rcv_msg); 2391 mutex_unlock(&net->xfrm.xfrm_cfg_mutex); 2392 } 2393 2394 static inline size_t xfrm_expire_msgsize(void) 2395 { 2396 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire)) 2397 + nla_total_size(sizeof(struct xfrm_mark)); 2398 } 2399 2400 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 2401 { 2402 struct xfrm_user_expire *ue; 2403 struct nlmsghdr *nlh; 2404 int err; 2405 2406 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0); 2407 if (nlh == NULL) 2408 return -EMSGSIZE; 2409 2410 ue = nlmsg_data(nlh); 2411 copy_to_user_state(x, &ue->state); 2412 ue->hard = (c->data.hard != 0) ? 1 : 0; 2413 2414 err = xfrm_mark_put(skb, &x->mark); 2415 if (err) 2416 return err; 2417 2418 return nlmsg_end(skb, nlh); 2419 } 2420 2421 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c) 2422 { 2423 struct net *net = xs_net(x); 2424 struct sk_buff *skb; 2425 2426 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC); 2427 if (skb == NULL) 2428 return -ENOMEM; 2429 2430 if (build_expire(skb, x, c) < 0) { 2431 kfree_skb(skb); 2432 return -EMSGSIZE; 2433 } 2434 2435 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE); 2436 } 2437 2438 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c) 2439 { 2440 struct net *net = xs_net(x); 2441 struct sk_buff *skb; 2442 2443 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 2444 if (skb == NULL) 2445 return -ENOMEM; 2446 2447 if (build_aevent(skb, x, c) < 0) 2448 BUG(); 2449 2450 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS); 2451 } 2452 2453 static int xfrm_notify_sa_flush(const struct km_event *c) 2454 { 2455 struct net *net = c->net; 2456 struct xfrm_usersa_flush *p; 2457 struct nlmsghdr *nlh; 2458 struct sk_buff *skb; 2459 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush)); 2460 2461 skb = nlmsg_new(len, GFP_ATOMIC); 2462 if (skb == NULL) 2463 return -ENOMEM; 2464 2465 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0); 2466 if (nlh == NULL) { 2467 kfree_skb(skb); 2468 return -EMSGSIZE; 2469 } 2470 2471 p = nlmsg_data(nlh); 2472 p->proto = c->data.proto; 2473 2474 nlmsg_end(skb, nlh); 2475 2476 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA); 2477 } 2478 2479 static inline size_t xfrm_sa_len(struct xfrm_state *x) 2480 { 2481 size_t l = 0; 2482 if (x->aead) 2483 l += nla_total_size(aead_len(x->aead)); 2484 if (x->aalg) { 2485 l += nla_total_size(sizeof(struct xfrm_algo) + 2486 (x->aalg->alg_key_len + 7) / 8); 2487 l += nla_total_size(xfrm_alg_auth_len(x->aalg)); 2488 } 2489 if (x->ealg) 2490 l += nla_total_size(xfrm_alg_len(x->ealg)); 2491 if (x->calg) 2492 l += nla_total_size(sizeof(*x->calg)); 2493 if (x->encap) 2494 l += nla_total_size(sizeof(*x->encap)); 2495 if (x->tfcpad) 2496 l += nla_total_size(sizeof(x->tfcpad)); 2497 if (x->replay_esn) 2498 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn)); 2499 if (x->security) 2500 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) + 2501 x->security->ctx_len); 2502 if (x->coaddr) 2503 l += nla_total_size(sizeof(*x->coaddr)); 2504 if (x->props.extra_flags) 2505 l += nla_total_size(sizeof(x->props.extra_flags)); 2506 2507 /* Must count x->lastused as it may become non-zero behind our back. */ 2508 l += nla_total_size(sizeof(u64)); 2509 2510 return l; 2511 } 2512 2513 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c) 2514 { 2515 struct net *net = xs_net(x); 2516 struct xfrm_usersa_info *p; 2517 struct xfrm_usersa_id *id; 2518 struct nlmsghdr *nlh; 2519 struct sk_buff *skb; 2520 int len = xfrm_sa_len(x); 2521 int headlen, err; 2522 2523 headlen = sizeof(*p); 2524 if (c->event == XFRM_MSG_DELSA) { 2525 len += nla_total_size(headlen); 2526 headlen = sizeof(*id); 2527 len += nla_total_size(sizeof(struct xfrm_mark)); 2528 } 2529 len += NLMSG_ALIGN(headlen); 2530 2531 skb = nlmsg_new(len, GFP_ATOMIC); 2532 if (skb == NULL) 2533 return -ENOMEM; 2534 2535 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); 2536 err = -EMSGSIZE; 2537 if (nlh == NULL) 2538 goto out_free_skb; 2539 2540 p = nlmsg_data(nlh); 2541 if (c->event == XFRM_MSG_DELSA) { 2542 struct nlattr *attr; 2543 2544 id = nlmsg_data(nlh); 2545 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr)); 2546 id->spi = x->id.spi; 2547 id->family = x->props.family; 2548 id->proto = x->id.proto; 2549 2550 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p)); 2551 err = -EMSGSIZE; 2552 if (attr == NULL) 2553 goto out_free_skb; 2554 2555 p = nla_data(attr); 2556 } 2557 err = copy_to_user_state_extra(x, p, skb); 2558 if (err) 2559 goto out_free_skb; 2560 2561 nlmsg_end(skb, nlh); 2562 2563 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA); 2564 2565 out_free_skb: 2566 kfree_skb(skb); 2567 return err; 2568 } 2569 2570 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c) 2571 { 2572 2573 switch (c->event) { 2574 case XFRM_MSG_EXPIRE: 2575 return xfrm_exp_state_notify(x, c); 2576 case XFRM_MSG_NEWAE: 2577 return xfrm_aevent_state_notify(x, c); 2578 case XFRM_MSG_DELSA: 2579 case XFRM_MSG_UPDSA: 2580 case XFRM_MSG_NEWSA: 2581 return xfrm_notify_sa(x, c); 2582 case XFRM_MSG_FLUSHSA: 2583 return xfrm_notify_sa_flush(c); 2584 default: 2585 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n", 2586 c->event); 2587 break; 2588 } 2589 2590 return 0; 2591 2592 } 2593 2594 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x, 2595 struct xfrm_policy *xp) 2596 { 2597 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire)) 2598 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 2599 + nla_total_size(sizeof(struct xfrm_mark)) 2600 + nla_total_size(xfrm_user_sec_ctx_size(x->security)) 2601 + userpolicy_type_attrsize(); 2602 } 2603 2604 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x, 2605 struct xfrm_tmpl *xt, struct xfrm_policy *xp) 2606 { 2607 __u32 seq = xfrm_get_acqseq(); 2608 struct xfrm_user_acquire *ua; 2609 struct nlmsghdr *nlh; 2610 int err; 2611 2612 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0); 2613 if (nlh == NULL) 2614 return -EMSGSIZE; 2615 2616 ua = nlmsg_data(nlh); 2617 memcpy(&ua->id, &x->id, sizeof(ua->id)); 2618 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr)); 2619 memcpy(&ua->sel, &x->sel, sizeof(ua->sel)); 2620 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT); 2621 ua->aalgos = xt->aalgos; 2622 ua->ealgos = xt->ealgos; 2623 ua->calgos = xt->calgos; 2624 ua->seq = x->km.seq = seq; 2625 2626 err = copy_to_user_tmpl(xp, skb); 2627 if (!err) 2628 err = copy_to_user_state_sec_ctx(x, skb); 2629 if (!err) 2630 err = copy_to_user_policy_type(xp->type, skb); 2631 if (!err) 2632 err = xfrm_mark_put(skb, &xp->mark); 2633 if (err) { 2634 nlmsg_cancel(skb, nlh); 2635 return err; 2636 } 2637 2638 return nlmsg_end(skb, nlh); 2639 } 2640 2641 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt, 2642 struct xfrm_policy *xp) 2643 { 2644 struct net *net = xs_net(x); 2645 struct sk_buff *skb; 2646 2647 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC); 2648 if (skb == NULL) 2649 return -ENOMEM; 2650 2651 if (build_acquire(skb, x, xt, xp) < 0) 2652 BUG(); 2653 2654 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE); 2655 } 2656 2657 /* User gives us xfrm_user_policy_info followed by an array of 0 2658 * or more templates. 2659 */ 2660 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt, 2661 u8 *data, int len, int *dir) 2662 { 2663 struct net *net = sock_net(sk); 2664 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data; 2665 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1); 2666 struct xfrm_policy *xp; 2667 int nr; 2668 2669 switch (sk->sk_family) { 2670 case AF_INET: 2671 if (opt != IP_XFRM_POLICY) { 2672 *dir = -EOPNOTSUPP; 2673 return NULL; 2674 } 2675 break; 2676 #if IS_ENABLED(CONFIG_IPV6) 2677 case AF_INET6: 2678 if (opt != IPV6_XFRM_POLICY) { 2679 *dir = -EOPNOTSUPP; 2680 return NULL; 2681 } 2682 break; 2683 #endif 2684 default: 2685 *dir = -EINVAL; 2686 return NULL; 2687 } 2688 2689 *dir = -EINVAL; 2690 2691 if (len < sizeof(*p) || 2692 verify_newpolicy_info(p)) 2693 return NULL; 2694 2695 nr = ((len - sizeof(*p)) / sizeof(*ut)); 2696 if (validate_tmpl(nr, ut, p->sel.family)) 2697 return NULL; 2698 2699 if (p->dir > XFRM_POLICY_OUT) 2700 return NULL; 2701 2702 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 2703 if (xp == NULL) { 2704 *dir = -ENOBUFS; 2705 return NULL; 2706 } 2707 2708 copy_from_user_policy(xp, p); 2709 xp->type = XFRM_POLICY_TYPE_MAIN; 2710 copy_templates(xp, ut, nr); 2711 2712 *dir = p->dir; 2713 2714 return xp; 2715 } 2716 2717 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp) 2718 { 2719 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire)) 2720 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 2721 + nla_total_size(xfrm_user_sec_ctx_size(xp->security)) 2722 + nla_total_size(sizeof(struct xfrm_mark)) 2723 + userpolicy_type_attrsize(); 2724 } 2725 2726 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp, 2727 int dir, const struct km_event *c) 2728 { 2729 struct xfrm_user_polexpire *upe; 2730 int hard = c->data.hard; 2731 struct nlmsghdr *nlh; 2732 int err; 2733 2734 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0); 2735 if (nlh == NULL) 2736 return -EMSGSIZE; 2737 2738 upe = nlmsg_data(nlh); 2739 copy_to_user_policy(xp, &upe->pol, dir); 2740 err = copy_to_user_tmpl(xp, skb); 2741 if (!err) 2742 err = copy_to_user_sec_ctx(xp, skb); 2743 if (!err) 2744 err = copy_to_user_policy_type(xp->type, skb); 2745 if (!err) 2746 err = xfrm_mark_put(skb, &xp->mark); 2747 if (err) { 2748 nlmsg_cancel(skb, nlh); 2749 return err; 2750 } 2751 upe->hard = !!hard; 2752 2753 return nlmsg_end(skb, nlh); 2754 } 2755 2756 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 2757 { 2758 struct net *net = xp_net(xp); 2759 struct sk_buff *skb; 2760 2761 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC); 2762 if (skb == NULL) 2763 return -ENOMEM; 2764 2765 if (build_polexpire(skb, xp, dir, c) < 0) 2766 BUG(); 2767 2768 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE); 2769 } 2770 2771 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) 2772 { 2773 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); 2774 struct net *net = xp_net(xp); 2775 struct xfrm_userpolicy_info *p; 2776 struct xfrm_userpolicy_id *id; 2777 struct nlmsghdr *nlh; 2778 struct sk_buff *skb; 2779 int headlen, err; 2780 2781 headlen = sizeof(*p); 2782 if (c->event == XFRM_MSG_DELPOLICY) { 2783 len += nla_total_size(headlen); 2784 headlen = sizeof(*id); 2785 } 2786 len += userpolicy_type_attrsize(); 2787 len += nla_total_size(sizeof(struct xfrm_mark)); 2788 len += NLMSG_ALIGN(headlen); 2789 2790 skb = nlmsg_new(len, GFP_ATOMIC); 2791 if (skb == NULL) 2792 return -ENOMEM; 2793 2794 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); 2795 err = -EMSGSIZE; 2796 if (nlh == NULL) 2797 goto out_free_skb; 2798 2799 p = nlmsg_data(nlh); 2800 if (c->event == XFRM_MSG_DELPOLICY) { 2801 struct nlattr *attr; 2802 2803 id = nlmsg_data(nlh); 2804 memset(id, 0, sizeof(*id)); 2805 id->dir = dir; 2806 if (c->data.byid) 2807 id->index = xp->index; 2808 else 2809 memcpy(&id->sel, &xp->selector, sizeof(id->sel)); 2810 2811 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p)); 2812 err = -EMSGSIZE; 2813 if (attr == NULL) 2814 goto out_free_skb; 2815 2816 p = nla_data(attr); 2817 } 2818 2819 copy_to_user_policy(xp, p, dir); 2820 err = copy_to_user_tmpl(xp, skb); 2821 if (!err) 2822 err = copy_to_user_policy_type(xp->type, skb); 2823 if (!err) 2824 err = xfrm_mark_put(skb, &xp->mark); 2825 if (err) 2826 goto out_free_skb; 2827 2828 nlmsg_end(skb, nlh); 2829 2830 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 2831 2832 out_free_skb: 2833 kfree_skb(skb); 2834 return err; 2835 } 2836 2837 static int xfrm_notify_policy_flush(const struct km_event *c) 2838 { 2839 struct net *net = c->net; 2840 struct nlmsghdr *nlh; 2841 struct sk_buff *skb; 2842 int err; 2843 2844 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC); 2845 if (skb == NULL) 2846 return -ENOMEM; 2847 2848 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0); 2849 err = -EMSGSIZE; 2850 if (nlh == NULL) 2851 goto out_free_skb; 2852 err = copy_to_user_policy_type(c->data.type, skb); 2853 if (err) 2854 goto out_free_skb; 2855 2856 nlmsg_end(skb, nlh); 2857 2858 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 2859 2860 out_free_skb: 2861 kfree_skb(skb); 2862 return err; 2863 } 2864 2865 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 2866 { 2867 2868 switch (c->event) { 2869 case XFRM_MSG_NEWPOLICY: 2870 case XFRM_MSG_UPDPOLICY: 2871 case XFRM_MSG_DELPOLICY: 2872 return xfrm_notify_policy(xp, dir, c); 2873 case XFRM_MSG_FLUSHPOLICY: 2874 return xfrm_notify_policy_flush(c); 2875 case XFRM_MSG_POLEXPIRE: 2876 return xfrm_exp_policy_notify(xp, dir, c); 2877 default: 2878 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n", 2879 c->event); 2880 } 2881 2882 return 0; 2883 2884 } 2885 2886 static inline size_t xfrm_report_msgsize(void) 2887 { 2888 return NLMSG_ALIGN(sizeof(struct xfrm_user_report)); 2889 } 2890 2891 static int build_report(struct sk_buff *skb, u8 proto, 2892 struct xfrm_selector *sel, xfrm_address_t *addr) 2893 { 2894 struct xfrm_user_report *ur; 2895 struct nlmsghdr *nlh; 2896 2897 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0); 2898 if (nlh == NULL) 2899 return -EMSGSIZE; 2900 2901 ur = nlmsg_data(nlh); 2902 ur->proto = proto; 2903 memcpy(&ur->sel, sel, sizeof(ur->sel)); 2904 2905 if (addr) { 2906 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr); 2907 if (err) { 2908 nlmsg_cancel(skb, nlh); 2909 return err; 2910 } 2911 } 2912 return nlmsg_end(skb, nlh); 2913 } 2914 2915 static int xfrm_send_report(struct net *net, u8 proto, 2916 struct xfrm_selector *sel, xfrm_address_t *addr) 2917 { 2918 struct sk_buff *skb; 2919 2920 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC); 2921 if (skb == NULL) 2922 return -ENOMEM; 2923 2924 if (build_report(skb, proto, sel, addr) < 0) 2925 BUG(); 2926 2927 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT); 2928 } 2929 2930 static inline size_t xfrm_mapping_msgsize(void) 2931 { 2932 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping)); 2933 } 2934 2935 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x, 2936 xfrm_address_t *new_saddr, __be16 new_sport) 2937 { 2938 struct xfrm_user_mapping *um; 2939 struct nlmsghdr *nlh; 2940 2941 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0); 2942 if (nlh == NULL) 2943 return -EMSGSIZE; 2944 2945 um = nlmsg_data(nlh); 2946 2947 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr)); 2948 um->id.spi = x->id.spi; 2949 um->id.family = x->props.family; 2950 um->id.proto = x->id.proto; 2951 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr)); 2952 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr)); 2953 um->new_sport = new_sport; 2954 um->old_sport = x->encap->encap_sport; 2955 um->reqid = x->props.reqid; 2956 2957 return nlmsg_end(skb, nlh); 2958 } 2959 2960 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, 2961 __be16 sport) 2962 { 2963 struct net *net = xs_net(x); 2964 struct sk_buff *skb; 2965 2966 if (x->id.proto != IPPROTO_ESP) 2967 return -EINVAL; 2968 2969 if (!x->encap) 2970 return -EINVAL; 2971 2972 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC); 2973 if (skb == NULL) 2974 return -ENOMEM; 2975 2976 if (build_mapping(skb, x, ipaddr, sport) < 0) 2977 BUG(); 2978 2979 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING); 2980 } 2981 2982 static bool xfrm_is_alive(const struct km_event *c) 2983 { 2984 return (bool)xfrm_acquire_is_on(c->net); 2985 } 2986 2987 static struct xfrm_mgr netlink_mgr = { 2988 .id = "netlink", 2989 .notify = xfrm_send_state_notify, 2990 .acquire = xfrm_send_acquire, 2991 .compile_policy = xfrm_compile_policy, 2992 .notify_policy = xfrm_send_policy_notify, 2993 .report = xfrm_send_report, 2994 .migrate = xfrm_send_migrate, 2995 .new_mapping = xfrm_send_mapping, 2996 .is_alive = xfrm_is_alive, 2997 }; 2998 2999 static int __net_init xfrm_user_net_init(struct net *net) 3000 { 3001 struct sock *nlsk; 3002 struct netlink_kernel_cfg cfg = { 3003 .groups = XFRMNLGRP_MAX, 3004 .input = xfrm_netlink_rcv, 3005 }; 3006 3007 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg); 3008 if (nlsk == NULL) 3009 return -ENOMEM; 3010 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */ 3011 rcu_assign_pointer(net->xfrm.nlsk, nlsk); 3012 return 0; 3013 } 3014 3015 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list) 3016 { 3017 struct net *net; 3018 list_for_each_entry(net, net_exit_list, exit_list) 3019 RCU_INIT_POINTER(net->xfrm.nlsk, NULL); 3020 synchronize_net(); 3021 list_for_each_entry(net, net_exit_list, exit_list) 3022 netlink_kernel_release(net->xfrm.nlsk_stash); 3023 } 3024 3025 static struct pernet_operations xfrm_user_net_ops = { 3026 .init = xfrm_user_net_init, 3027 .exit_batch = xfrm_user_net_exit, 3028 }; 3029 3030 static int __init xfrm_user_init(void) 3031 { 3032 int rv; 3033 3034 printk(KERN_INFO "Initializing XFRM netlink socket\n"); 3035 3036 rv = register_pernet_subsys(&xfrm_user_net_ops); 3037 if (rv < 0) 3038 return rv; 3039 rv = xfrm_register_km(&netlink_mgr); 3040 if (rv < 0) 3041 unregister_pernet_subsys(&xfrm_user_net_ops); 3042 return rv; 3043 } 3044 3045 static void __exit xfrm_user_exit(void) 3046 { 3047 xfrm_unregister_km(&netlink_mgr); 3048 unregister_pernet_subsys(&xfrm_user_net_ops); 3049 } 3050 3051 module_init(xfrm_user_init); 3052 module_exit(xfrm_user_exit); 3053 MODULE_LICENSE("GPL"); 3054 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM); 3055 3056