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 <linux/uaccess.h> 31 #if IS_ENABLED(CONFIG_IPV6) 32 #include <linux/in6.h> 33 #endif 34 #include <asm/unaligned.h> 35 36 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type) 37 { 38 struct nlattr *rt = attrs[type]; 39 struct xfrm_algo *algp; 40 41 if (!rt) 42 return 0; 43 44 algp = nla_data(rt); 45 if (nla_len(rt) < (int)xfrm_alg_len(algp)) 46 return -EINVAL; 47 48 switch (type) { 49 case XFRMA_ALG_AUTH: 50 case XFRMA_ALG_CRYPT: 51 case XFRMA_ALG_COMP: 52 break; 53 54 default: 55 return -EINVAL; 56 } 57 58 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0'; 59 return 0; 60 } 61 62 static int verify_auth_trunc(struct nlattr **attrs) 63 { 64 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC]; 65 struct xfrm_algo_auth *algp; 66 67 if (!rt) 68 return 0; 69 70 algp = nla_data(rt); 71 if (nla_len(rt) < (int)xfrm_alg_auth_len(algp)) 72 return -EINVAL; 73 74 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0'; 75 return 0; 76 } 77 78 static int verify_aead(struct nlattr **attrs) 79 { 80 struct nlattr *rt = attrs[XFRMA_ALG_AEAD]; 81 struct xfrm_algo_aead *algp; 82 83 if (!rt) 84 return 0; 85 86 algp = nla_data(rt); 87 if (nla_len(rt) < (int)aead_len(algp)) 88 return -EINVAL; 89 90 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0'; 91 return 0; 92 } 93 94 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type, 95 xfrm_address_t **addrp) 96 { 97 struct nlattr *rt = attrs[type]; 98 99 if (rt && addrp) 100 *addrp = nla_data(rt); 101 } 102 103 static inline int verify_sec_ctx_len(struct nlattr **attrs) 104 { 105 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 106 struct xfrm_user_sec_ctx *uctx; 107 108 if (!rt) 109 return 0; 110 111 uctx = nla_data(rt); 112 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len)) 113 return -EINVAL; 114 115 return 0; 116 } 117 118 static inline int verify_replay(struct xfrm_usersa_info *p, 119 struct nlattr **attrs) 120 { 121 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL]; 122 struct xfrm_replay_state_esn *rs; 123 124 if (p->flags & XFRM_STATE_ESN) { 125 if (!rt) 126 return -EINVAL; 127 128 rs = nla_data(rt); 129 130 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8) 131 return -EINVAL; 132 133 if (nla_len(rt) < (int)xfrm_replay_state_esn_len(rs) && 134 nla_len(rt) != sizeof(*rs)) 135 return -EINVAL; 136 } 137 138 if (!rt) 139 return 0; 140 141 /* As only ESP and AH support ESN feature. */ 142 if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH)) 143 return -EINVAL; 144 145 if (p->replay_window != 0) 146 return -EINVAL; 147 148 return 0; 149 } 150 151 static int verify_newsa_info(struct xfrm_usersa_info *p, 152 struct nlattr **attrs) 153 { 154 int err; 155 156 err = -EINVAL; 157 switch (p->family) { 158 case AF_INET: 159 break; 160 161 case AF_INET6: 162 #if IS_ENABLED(CONFIG_IPV6) 163 break; 164 #else 165 err = -EAFNOSUPPORT; 166 goto out; 167 #endif 168 169 default: 170 goto out; 171 } 172 173 err = -EINVAL; 174 switch (p->id.proto) { 175 case IPPROTO_AH: 176 if ((!attrs[XFRMA_ALG_AUTH] && 177 !attrs[XFRMA_ALG_AUTH_TRUNC]) || 178 attrs[XFRMA_ALG_AEAD] || 179 attrs[XFRMA_ALG_CRYPT] || 180 attrs[XFRMA_ALG_COMP] || 181 attrs[XFRMA_TFCPAD]) 182 goto out; 183 break; 184 185 case IPPROTO_ESP: 186 if (attrs[XFRMA_ALG_COMP]) 187 goto out; 188 if (!attrs[XFRMA_ALG_AUTH] && 189 !attrs[XFRMA_ALG_AUTH_TRUNC] && 190 !attrs[XFRMA_ALG_CRYPT] && 191 !attrs[XFRMA_ALG_AEAD]) 192 goto out; 193 if ((attrs[XFRMA_ALG_AUTH] || 194 attrs[XFRMA_ALG_AUTH_TRUNC] || 195 attrs[XFRMA_ALG_CRYPT]) && 196 attrs[XFRMA_ALG_AEAD]) 197 goto out; 198 if (attrs[XFRMA_TFCPAD] && 199 p->mode != XFRM_MODE_TUNNEL) 200 goto out; 201 break; 202 203 case IPPROTO_COMP: 204 if (!attrs[XFRMA_ALG_COMP] || 205 attrs[XFRMA_ALG_AEAD] || 206 attrs[XFRMA_ALG_AUTH] || 207 attrs[XFRMA_ALG_AUTH_TRUNC] || 208 attrs[XFRMA_ALG_CRYPT] || 209 attrs[XFRMA_TFCPAD] || 210 (ntohl(p->id.spi) >= 0x10000)) 211 goto out; 212 break; 213 214 #if IS_ENABLED(CONFIG_IPV6) 215 case IPPROTO_DSTOPTS: 216 case IPPROTO_ROUTING: 217 if (attrs[XFRMA_ALG_COMP] || 218 attrs[XFRMA_ALG_AUTH] || 219 attrs[XFRMA_ALG_AUTH_TRUNC] || 220 attrs[XFRMA_ALG_AEAD] || 221 attrs[XFRMA_ALG_CRYPT] || 222 attrs[XFRMA_ENCAP] || 223 attrs[XFRMA_SEC_CTX] || 224 attrs[XFRMA_TFCPAD] || 225 !attrs[XFRMA_COADDR]) 226 goto out; 227 break; 228 #endif 229 230 default: 231 goto out; 232 } 233 234 if ((err = verify_aead(attrs))) 235 goto out; 236 if ((err = verify_auth_trunc(attrs))) 237 goto out; 238 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH))) 239 goto out; 240 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT))) 241 goto out; 242 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP))) 243 goto out; 244 if ((err = verify_sec_ctx_len(attrs))) 245 goto out; 246 if ((err = verify_replay(p, attrs))) 247 goto out; 248 249 err = -EINVAL; 250 switch (p->mode) { 251 case XFRM_MODE_TRANSPORT: 252 case XFRM_MODE_TUNNEL: 253 case XFRM_MODE_ROUTEOPTIMIZATION: 254 case XFRM_MODE_BEET: 255 break; 256 257 default: 258 goto out; 259 } 260 261 err = 0; 262 263 out: 264 return err; 265 } 266 267 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props, 268 struct xfrm_algo_desc *(*get_byname)(const char *, int), 269 struct nlattr *rta) 270 { 271 struct xfrm_algo *p, *ualg; 272 struct xfrm_algo_desc *algo; 273 274 if (!rta) 275 return 0; 276 277 ualg = nla_data(rta); 278 279 algo = get_byname(ualg->alg_name, 1); 280 if (!algo) 281 return -ENOSYS; 282 *props = algo->desc.sadb_alg_id; 283 284 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL); 285 if (!p) 286 return -ENOMEM; 287 288 strcpy(p->alg_name, algo->name); 289 *algpp = p; 290 return 0; 291 } 292 293 static int attach_crypt(struct xfrm_state *x, struct nlattr *rta) 294 { 295 struct xfrm_algo *p, *ualg; 296 struct xfrm_algo_desc *algo; 297 298 if (!rta) 299 return 0; 300 301 ualg = nla_data(rta); 302 303 algo = xfrm_ealg_get_byname(ualg->alg_name, 1); 304 if (!algo) 305 return -ENOSYS; 306 x->props.ealgo = algo->desc.sadb_alg_id; 307 308 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL); 309 if (!p) 310 return -ENOMEM; 311 312 strcpy(p->alg_name, algo->name); 313 x->ealg = p; 314 x->geniv = algo->uinfo.encr.geniv; 315 return 0; 316 } 317 318 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props, 319 struct nlattr *rta) 320 { 321 struct xfrm_algo *ualg; 322 struct xfrm_algo_auth *p; 323 struct xfrm_algo_desc *algo; 324 325 if (!rta) 326 return 0; 327 328 ualg = nla_data(rta); 329 330 algo = xfrm_aalg_get_byname(ualg->alg_name, 1); 331 if (!algo) 332 return -ENOSYS; 333 *props = algo->desc.sadb_alg_id; 334 335 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL); 336 if (!p) 337 return -ENOMEM; 338 339 strcpy(p->alg_name, algo->name); 340 p->alg_key_len = ualg->alg_key_len; 341 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; 342 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8); 343 344 *algpp = p; 345 return 0; 346 } 347 348 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props, 349 struct nlattr *rta) 350 { 351 struct xfrm_algo_auth *p, *ualg; 352 struct xfrm_algo_desc *algo; 353 354 if (!rta) 355 return 0; 356 357 ualg = nla_data(rta); 358 359 algo = xfrm_aalg_get_byname(ualg->alg_name, 1); 360 if (!algo) 361 return -ENOSYS; 362 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits) 363 return -EINVAL; 364 *props = algo->desc.sadb_alg_id; 365 366 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL); 367 if (!p) 368 return -ENOMEM; 369 370 strcpy(p->alg_name, algo->name); 371 if (!p->alg_trunc_len) 372 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; 373 374 *algpp = p; 375 return 0; 376 } 377 378 static int attach_aead(struct xfrm_state *x, struct nlattr *rta) 379 { 380 struct xfrm_algo_aead *p, *ualg; 381 struct xfrm_algo_desc *algo; 382 383 if (!rta) 384 return 0; 385 386 ualg = nla_data(rta); 387 388 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1); 389 if (!algo) 390 return -ENOSYS; 391 x->props.ealgo = algo->desc.sadb_alg_id; 392 393 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL); 394 if (!p) 395 return -ENOMEM; 396 397 strcpy(p->alg_name, algo->name); 398 x->aead = p; 399 x->geniv = algo->uinfo.aead.geniv; 400 return 0; 401 } 402 403 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn, 404 struct nlattr *rp) 405 { 406 struct xfrm_replay_state_esn *up; 407 unsigned int ulen; 408 409 if (!replay_esn || !rp) 410 return 0; 411 412 up = nla_data(rp); 413 ulen = xfrm_replay_state_esn_len(up); 414 415 /* Check the overall length and the internal bitmap length to avoid 416 * potential overflow. */ 417 if (nla_len(rp) < (int)ulen || 418 xfrm_replay_state_esn_len(replay_esn) != ulen || 419 replay_esn->bmp_len != up->bmp_len) 420 return -EINVAL; 421 422 if (up->replay_window > up->bmp_len * sizeof(__u32) * 8) 423 return -EINVAL; 424 425 return 0; 426 } 427 428 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn, 429 struct xfrm_replay_state_esn **preplay_esn, 430 struct nlattr *rta) 431 { 432 struct xfrm_replay_state_esn *p, *pp, *up; 433 unsigned int klen, ulen; 434 435 if (!rta) 436 return 0; 437 438 up = nla_data(rta); 439 klen = xfrm_replay_state_esn_len(up); 440 ulen = nla_len(rta) >= (int)klen ? klen : sizeof(*up); 441 442 p = kzalloc(klen, GFP_KERNEL); 443 if (!p) 444 return -ENOMEM; 445 446 pp = kzalloc(klen, GFP_KERNEL); 447 if (!pp) { 448 kfree(p); 449 return -ENOMEM; 450 } 451 452 memcpy(p, up, ulen); 453 memcpy(pp, up, ulen); 454 455 *replay_esn = p; 456 *preplay_esn = pp; 457 458 return 0; 459 } 460 461 static inline unsigned int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx) 462 { 463 unsigned int len = 0; 464 465 if (xfrm_ctx) { 466 len += sizeof(struct xfrm_user_sec_ctx); 467 len += xfrm_ctx->ctx_len; 468 } 469 return len; 470 } 471 472 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 473 { 474 memcpy(&x->id, &p->id, sizeof(x->id)); 475 memcpy(&x->sel, &p->sel, sizeof(x->sel)); 476 memcpy(&x->lft, &p->lft, sizeof(x->lft)); 477 x->props.mode = p->mode; 478 x->props.replay_window = min_t(unsigned int, p->replay_window, 479 sizeof(x->replay.bitmap) * 8); 480 x->props.reqid = p->reqid; 481 x->props.family = p->family; 482 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr)); 483 x->props.flags = p->flags; 484 485 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC)) 486 x->sel.family = p->family; 487 } 488 489 /* 490 * someday when pfkey also has support, we could have the code 491 * somehow made shareable and move it to xfrm_state.c - JHS 492 * 493 */ 494 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs, 495 int update_esn) 496 { 497 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 498 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL; 499 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 500 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; 501 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; 502 503 if (re) { 504 struct xfrm_replay_state_esn *replay_esn; 505 replay_esn = nla_data(re); 506 memcpy(x->replay_esn, replay_esn, 507 xfrm_replay_state_esn_len(replay_esn)); 508 memcpy(x->preplay_esn, replay_esn, 509 xfrm_replay_state_esn_len(replay_esn)); 510 } 511 512 if (rp) { 513 struct xfrm_replay_state *replay; 514 replay = nla_data(rp); 515 memcpy(&x->replay, replay, sizeof(*replay)); 516 memcpy(&x->preplay, replay, sizeof(*replay)); 517 } 518 519 if (lt) { 520 struct xfrm_lifetime_cur *ltime; 521 ltime = nla_data(lt); 522 x->curlft.bytes = ltime->bytes; 523 x->curlft.packets = ltime->packets; 524 x->curlft.add_time = ltime->add_time; 525 x->curlft.use_time = ltime->use_time; 526 } 527 528 if (et) 529 x->replay_maxage = nla_get_u32(et); 530 531 if (rt) 532 x->replay_maxdiff = nla_get_u32(rt); 533 } 534 535 static struct xfrm_state *xfrm_state_construct(struct net *net, 536 struct xfrm_usersa_info *p, 537 struct nlattr **attrs, 538 int *errp) 539 { 540 struct xfrm_state *x = xfrm_state_alloc(net); 541 int err = -ENOMEM; 542 543 if (!x) 544 goto error_no_put; 545 546 copy_from_user_state(x, p); 547 548 if (attrs[XFRMA_SA_EXTRA_FLAGS]) 549 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]); 550 551 if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD]))) 552 goto error; 553 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo, 554 attrs[XFRMA_ALG_AUTH_TRUNC]))) 555 goto error; 556 if (!x->props.aalgo) { 557 if ((err = attach_auth(&x->aalg, &x->props.aalgo, 558 attrs[XFRMA_ALG_AUTH]))) 559 goto error; 560 } 561 if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT]))) 562 goto error; 563 if ((err = attach_one_algo(&x->calg, &x->props.calgo, 564 xfrm_calg_get_byname, 565 attrs[XFRMA_ALG_COMP]))) 566 goto error; 567 568 if (attrs[XFRMA_ENCAP]) { 569 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]), 570 sizeof(*x->encap), GFP_KERNEL); 571 if (x->encap == NULL) 572 goto error; 573 } 574 575 if (attrs[XFRMA_TFCPAD]) 576 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]); 577 578 if (attrs[XFRMA_COADDR]) { 579 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]), 580 sizeof(*x->coaddr), GFP_KERNEL); 581 if (x->coaddr == NULL) 582 goto error; 583 } 584 585 xfrm_mark_get(attrs, &x->mark); 586 587 if (attrs[XFRMA_OUTPUT_MARK]) 588 x->props.output_mark = nla_get_u32(attrs[XFRMA_OUTPUT_MARK]); 589 590 err = __xfrm_init_state(x, false, attrs[XFRMA_OFFLOAD_DEV]); 591 if (err) 592 goto error; 593 594 if (attrs[XFRMA_SEC_CTX]) { 595 err = security_xfrm_state_alloc(x, 596 nla_data(attrs[XFRMA_SEC_CTX])); 597 if (err) 598 goto error; 599 } 600 601 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn, 602 attrs[XFRMA_REPLAY_ESN_VAL]))) 603 goto error; 604 605 x->km.seq = p->seq; 606 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth; 607 /* sysctl_xfrm_aevent_etime is in 100ms units */ 608 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M; 609 610 if ((err = xfrm_init_replay(x))) 611 goto error; 612 613 /* override default values from above */ 614 xfrm_update_ae_params(x, attrs, 0); 615 616 /* configure the hardware if offload is requested */ 617 if (attrs[XFRMA_OFFLOAD_DEV]) { 618 err = xfrm_dev_state_add(net, x, 619 nla_data(attrs[XFRMA_OFFLOAD_DEV])); 620 if (err) 621 goto error; 622 } 623 624 return x; 625 626 error: 627 x->km.state = XFRM_STATE_DEAD; 628 xfrm_state_put(x); 629 error_no_put: 630 *errp = err; 631 return NULL; 632 } 633 634 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 635 struct nlattr **attrs) 636 { 637 struct net *net = sock_net(skb->sk); 638 struct xfrm_usersa_info *p = nlmsg_data(nlh); 639 struct xfrm_state *x; 640 int err; 641 struct km_event c; 642 643 err = verify_newsa_info(p, attrs); 644 if (err) 645 return err; 646 647 x = xfrm_state_construct(net, p, attrs, &err); 648 if (!x) 649 return err; 650 651 xfrm_state_hold(x); 652 if (nlh->nlmsg_type == XFRM_MSG_NEWSA) 653 err = xfrm_state_add(x); 654 else 655 err = xfrm_state_update(x); 656 657 xfrm_audit_state_add(x, err ? 0 : 1, true); 658 659 if (err < 0) { 660 x->km.state = XFRM_STATE_DEAD; 661 xfrm_dev_state_delete(x); 662 __xfrm_state_put(x); 663 goto out; 664 } 665 666 if (x->km.state == XFRM_STATE_VOID) 667 x->km.state = XFRM_STATE_VALID; 668 669 c.seq = nlh->nlmsg_seq; 670 c.portid = nlh->nlmsg_pid; 671 c.event = nlh->nlmsg_type; 672 673 km_state_notify(x, &c); 674 out: 675 xfrm_state_put(x); 676 return err; 677 } 678 679 static struct xfrm_state *xfrm_user_state_lookup(struct net *net, 680 struct xfrm_usersa_id *p, 681 struct nlattr **attrs, 682 int *errp) 683 { 684 struct xfrm_state *x = NULL; 685 struct xfrm_mark m; 686 int err; 687 u32 mark = xfrm_mark_get(attrs, &m); 688 689 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) { 690 err = -ESRCH; 691 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family); 692 } else { 693 xfrm_address_t *saddr = NULL; 694 695 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr); 696 if (!saddr) { 697 err = -EINVAL; 698 goto out; 699 } 700 701 err = -ESRCH; 702 x = xfrm_state_lookup_byaddr(net, mark, 703 &p->daddr, saddr, 704 p->proto, p->family); 705 } 706 707 out: 708 if (!x && errp) 709 *errp = err; 710 return x; 711 } 712 713 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 714 struct nlattr **attrs) 715 { 716 struct net *net = sock_net(skb->sk); 717 struct xfrm_state *x; 718 int err = -ESRCH; 719 struct km_event c; 720 struct xfrm_usersa_id *p = nlmsg_data(nlh); 721 722 x = xfrm_user_state_lookup(net, p, attrs, &err); 723 if (x == NULL) 724 return err; 725 726 if ((err = security_xfrm_state_delete(x)) != 0) 727 goto out; 728 729 if (xfrm_state_kern(x)) { 730 err = -EPERM; 731 goto out; 732 } 733 734 err = xfrm_state_delete(x); 735 736 if (err < 0) 737 goto out; 738 739 c.seq = nlh->nlmsg_seq; 740 c.portid = nlh->nlmsg_pid; 741 c.event = nlh->nlmsg_type; 742 km_state_notify(x, &c); 743 744 out: 745 xfrm_audit_state_delete(x, err ? 0 : 1, true); 746 xfrm_state_put(x); 747 return err; 748 } 749 750 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 751 { 752 memset(p, 0, sizeof(*p)); 753 memcpy(&p->id, &x->id, sizeof(p->id)); 754 memcpy(&p->sel, &x->sel, sizeof(p->sel)); 755 memcpy(&p->lft, &x->lft, sizeof(p->lft)); 756 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft)); 757 put_unaligned(x->stats.replay_window, &p->stats.replay_window); 758 put_unaligned(x->stats.replay, &p->stats.replay); 759 put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed); 760 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr)); 761 p->mode = x->props.mode; 762 p->replay_window = x->props.replay_window; 763 p->reqid = x->props.reqid; 764 p->family = x->props.family; 765 p->flags = x->props.flags; 766 p->seq = x->km.seq; 767 } 768 769 struct xfrm_dump_info { 770 struct sk_buff *in_skb; 771 struct sk_buff *out_skb; 772 u32 nlmsg_seq; 773 u16 nlmsg_flags; 774 }; 775 776 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb) 777 { 778 struct xfrm_user_sec_ctx *uctx; 779 struct nlattr *attr; 780 int ctx_size = sizeof(*uctx) + s->ctx_len; 781 782 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size); 783 if (attr == NULL) 784 return -EMSGSIZE; 785 786 uctx = nla_data(attr); 787 uctx->exttype = XFRMA_SEC_CTX; 788 uctx->len = ctx_size; 789 uctx->ctx_doi = s->ctx_doi; 790 uctx->ctx_alg = s->ctx_alg; 791 uctx->ctx_len = s->ctx_len; 792 memcpy(uctx + 1, s->ctx_str, s->ctx_len); 793 794 return 0; 795 } 796 797 static int copy_user_offload(struct xfrm_state_offload *xso, struct sk_buff *skb) 798 { 799 struct xfrm_user_offload *xuo; 800 struct nlattr *attr; 801 802 attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo)); 803 if (attr == NULL) 804 return -EMSGSIZE; 805 806 xuo = nla_data(attr); 807 memset(xuo, 0, sizeof(*xuo)); 808 xuo->ifindex = xso->dev->ifindex; 809 xuo->flags = xso->flags; 810 811 return 0; 812 } 813 814 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb) 815 { 816 struct xfrm_algo *algo; 817 struct nlattr *nla; 818 819 nla = nla_reserve(skb, XFRMA_ALG_AUTH, 820 sizeof(*algo) + (auth->alg_key_len + 7) / 8); 821 if (!nla) 822 return -EMSGSIZE; 823 824 algo = nla_data(nla); 825 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name)); 826 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8); 827 algo->alg_key_len = auth->alg_key_len; 828 829 return 0; 830 } 831 832 /* Don't change this without updating xfrm_sa_len! */ 833 static int copy_to_user_state_extra(struct xfrm_state *x, 834 struct xfrm_usersa_info *p, 835 struct sk_buff *skb) 836 { 837 int ret = 0; 838 839 copy_to_user_state(x, p); 840 841 if (x->props.extra_flags) { 842 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS, 843 x->props.extra_flags); 844 if (ret) 845 goto out; 846 } 847 848 if (x->coaddr) { 849 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr); 850 if (ret) 851 goto out; 852 } 853 if (x->lastused) { 854 ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused, 855 XFRMA_PAD); 856 if (ret) 857 goto out; 858 } 859 if (x->aead) { 860 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead); 861 if (ret) 862 goto out; 863 } 864 if (x->aalg) { 865 ret = copy_to_user_auth(x->aalg, skb); 866 if (!ret) 867 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC, 868 xfrm_alg_auth_len(x->aalg), x->aalg); 869 if (ret) 870 goto out; 871 } 872 if (x->ealg) { 873 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg); 874 if (ret) 875 goto out; 876 } 877 if (x->calg) { 878 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg); 879 if (ret) 880 goto out; 881 } 882 if (x->encap) { 883 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap); 884 if (ret) 885 goto out; 886 } 887 if (x->tfcpad) { 888 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad); 889 if (ret) 890 goto out; 891 } 892 ret = xfrm_mark_put(skb, &x->mark); 893 if (ret) 894 goto out; 895 if (x->replay_esn) 896 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL, 897 xfrm_replay_state_esn_len(x->replay_esn), 898 x->replay_esn); 899 else 900 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), 901 &x->replay); 902 if (ret) 903 goto out; 904 if(x->xso.dev) 905 ret = copy_user_offload(&x->xso, skb); 906 if (ret) 907 goto out; 908 if (x->props.output_mark) { 909 ret = nla_put_u32(skb, XFRMA_OUTPUT_MARK, x->props.output_mark); 910 if (ret) 911 goto out; 912 } 913 if (x->security) 914 ret = copy_sec_ctx(x->security, skb); 915 out: 916 return ret; 917 } 918 919 static int dump_one_state(struct xfrm_state *x, int count, void *ptr) 920 { 921 struct xfrm_dump_info *sp = ptr; 922 struct sk_buff *in_skb = sp->in_skb; 923 struct sk_buff *skb = sp->out_skb; 924 struct xfrm_usersa_info *p; 925 struct nlmsghdr *nlh; 926 int err; 927 928 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, 929 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags); 930 if (nlh == NULL) 931 return -EMSGSIZE; 932 933 p = nlmsg_data(nlh); 934 935 err = copy_to_user_state_extra(x, p, skb); 936 if (err) { 937 nlmsg_cancel(skb, nlh); 938 return err; 939 } 940 nlmsg_end(skb, nlh); 941 return 0; 942 } 943 944 static int xfrm_dump_sa_done(struct netlink_callback *cb) 945 { 946 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 947 struct sock *sk = cb->skb->sk; 948 struct net *net = sock_net(sk); 949 950 if (cb->args[0]) 951 xfrm_state_walk_done(walk, net); 952 return 0; 953 } 954 955 static const struct nla_policy xfrma_policy[XFRMA_MAX+1]; 956 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb) 957 { 958 struct net *net = sock_net(skb->sk); 959 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 960 struct xfrm_dump_info info; 961 962 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) > 963 sizeof(cb->args) - sizeof(cb->args[0])); 964 965 info.in_skb = cb->skb; 966 info.out_skb = skb; 967 info.nlmsg_seq = cb->nlh->nlmsg_seq; 968 info.nlmsg_flags = NLM_F_MULTI; 969 970 if (!cb->args[0]) { 971 struct nlattr *attrs[XFRMA_MAX+1]; 972 struct xfrm_address_filter *filter = NULL; 973 u8 proto = 0; 974 int err; 975 976 err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX, xfrma_policy, 977 NULL); 978 if (err < 0) 979 return err; 980 981 if (attrs[XFRMA_ADDRESS_FILTER]) { 982 filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]), 983 sizeof(*filter), GFP_KERNEL); 984 if (filter == NULL) 985 return -ENOMEM; 986 } 987 988 if (attrs[XFRMA_PROTO]) 989 proto = nla_get_u8(attrs[XFRMA_PROTO]); 990 991 xfrm_state_walk_init(walk, proto, filter); 992 cb->args[0] = 1; 993 } 994 995 (void) xfrm_state_walk(net, walk, dump_one_state, &info); 996 997 return skb->len; 998 } 999 1000 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb, 1001 struct xfrm_state *x, u32 seq) 1002 { 1003 struct xfrm_dump_info info; 1004 struct sk_buff *skb; 1005 int err; 1006 1007 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1008 if (!skb) 1009 return ERR_PTR(-ENOMEM); 1010 1011 info.in_skb = in_skb; 1012 info.out_skb = skb; 1013 info.nlmsg_seq = seq; 1014 info.nlmsg_flags = 0; 1015 1016 err = dump_one_state(x, 0, &info); 1017 if (err) { 1018 kfree_skb(skb); 1019 return ERR_PTR(err); 1020 } 1021 1022 return skb; 1023 } 1024 1025 /* A wrapper for nlmsg_multicast() checking that nlsk is still available. 1026 * Must be called with RCU read lock. 1027 */ 1028 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb, 1029 u32 pid, unsigned int group) 1030 { 1031 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk); 1032 1033 if (nlsk) 1034 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC); 1035 else 1036 return -1; 1037 } 1038 1039 static inline unsigned int xfrm_spdinfo_msgsize(void) 1040 { 1041 return NLMSG_ALIGN(4) 1042 + nla_total_size(sizeof(struct xfrmu_spdinfo)) 1043 + nla_total_size(sizeof(struct xfrmu_spdhinfo)) 1044 + nla_total_size(sizeof(struct xfrmu_spdhthresh)) 1045 + nla_total_size(sizeof(struct xfrmu_spdhthresh)); 1046 } 1047 1048 static int build_spdinfo(struct sk_buff *skb, struct net *net, 1049 u32 portid, u32 seq, u32 flags) 1050 { 1051 struct xfrmk_spdinfo si; 1052 struct xfrmu_spdinfo spc; 1053 struct xfrmu_spdhinfo sph; 1054 struct xfrmu_spdhthresh spt4, spt6; 1055 struct nlmsghdr *nlh; 1056 int err; 1057 u32 *f; 1058 unsigned lseq; 1059 1060 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0); 1061 if (nlh == NULL) /* shouldn't really happen ... */ 1062 return -EMSGSIZE; 1063 1064 f = nlmsg_data(nlh); 1065 *f = flags; 1066 xfrm_spd_getinfo(net, &si); 1067 spc.incnt = si.incnt; 1068 spc.outcnt = si.outcnt; 1069 spc.fwdcnt = si.fwdcnt; 1070 spc.inscnt = si.inscnt; 1071 spc.outscnt = si.outscnt; 1072 spc.fwdscnt = si.fwdscnt; 1073 sph.spdhcnt = si.spdhcnt; 1074 sph.spdhmcnt = si.spdhmcnt; 1075 1076 do { 1077 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock); 1078 1079 spt4.lbits = net->xfrm.policy_hthresh.lbits4; 1080 spt4.rbits = net->xfrm.policy_hthresh.rbits4; 1081 spt6.lbits = net->xfrm.policy_hthresh.lbits6; 1082 spt6.rbits = net->xfrm.policy_hthresh.rbits6; 1083 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq)); 1084 1085 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc); 1086 if (!err) 1087 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph); 1088 if (!err) 1089 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4); 1090 if (!err) 1091 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6); 1092 if (err) { 1093 nlmsg_cancel(skb, nlh); 1094 return err; 1095 } 1096 1097 nlmsg_end(skb, nlh); 1098 return 0; 1099 } 1100 1101 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1102 struct nlattr **attrs) 1103 { 1104 struct net *net = sock_net(skb->sk); 1105 struct xfrmu_spdhthresh *thresh4 = NULL; 1106 struct xfrmu_spdhthresh *thresh6 = NULL; 1107 1108 /* selector prefixlen thresholds to hash policies */ 1109 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) { 1110 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH]; 1111 1112 if (nla_len(rta) < sizeof(*thresh4)) 1113 return -EINVAL; 1114 thresh4 = nla_data(rta); 1115 if (thresh4->lbits > 32 || thresh4->rbits > 32) 1116 return -EINVAL; 1117 } 1118 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) { 1119 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH]; 1120 1121 if (nla_len(rta) < sizeof(*thresh6)) 1122 return -EINVAL; 1123 thresh6 = nla_data(rta); 1124 if (thresh6->lbits > 128 || thresh6->rbits > 128) 1125 return -EINVAL; 1126 } 1127 1128 if (thresh4 || thresh6) { 1129 write_seqlock(&net->xfrm.policy_hthresh.lock); 1130 if (thresh4) { 1131 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits; 1132 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits; 1133 } 1134 if (thresh6) { 1135 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits; 1136 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits; 1137 } 1138 write_sequnlock(&net->xfrm.policy_hthresh.lock); 1139 1140 xfrm_policy_hash_rebuild(net); 1141 } 1142 1143 return 0; 1144 } 1145 1146 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1147 struct nlattr **attrs) 1148 { 1149 struct net *net = sock_net(skb->sk); 1150 struct sk_buff *r_skb; 1151 u32 *flags = nlmsg_data(nlh); 1152 u32 sportid = NETLINK_CB(skb).portid; 1153 u32 seq = nlh->nlmsg_seq; 1154 int err; 1155 1156 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC); 1157 if (r_skb == NULL) 1158 return -ENOMEM; 1159 1160 err = build_spdinfo(r_skb, net, sportid, seq, *flags); 1161 BUG_ON(err < 0); 1162 1163 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); 1164 } 1165 1166 static inline unsigned int xfrm_sadinfo_msgsize(void) 1167 { 1168 return NLMSG_ALIGN(4) 1169 + nla_total_size(sizeof(struct xfrmu_sadhinfo)) 1170 + nla_total_size(4); /* XFRMA_SAD_CNT */ 1171 } 1172 1173 static int build_sadinfo(struct sk_buff *skb, struct net *net, 1174 u32 portid, u32 seq, u32 flags) 1175 { 1176 struct xfrmk_sadinfo si; 1177 struct xfrmu_sadhinfo sh; 1178 struct nlmsghdr *nlh; 1179 int err; 1180 u32 *f; 1181 1182 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0); 1183 if (nlh == NULL) /* shouldn't really happen ... */ 1184 return -EMSGSIZE; 1185 1186 f = nlmsg_data(nlh); 1187 *f = flags; 1188 xfrm_sad_getinfo(net, &si); 1189 1190 sh.sadhmcnt = si.sadhmcnt; 1191 sh.sadhcnt = si.sadhcnt; 1192 1193 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt); 1194 if (!err) 1195 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh); 1196 if (err) { 1197 nlmsg_cancel(skb, nlh); 1198 return err; 1199 } 1200 1201 nlmsg_end(skb, nlh); 1202 return 0; 1203 } 1204 1205 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1206 struct nlattr **attrs) 1207 { 1208 struct net *net = sock_net(skb->sk); 1209 struct sk_buff *r_skb; 1210 u32 *flags = nlmsg_data(nlh); 1211 u32 sportid = NETLINK_CB(skb).portid; 1212 u32 seq = nlh->nlmsg_seq; 1213 int err; 1214 1215 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC); 1216 if (r_skb == NULL) 1217 return -ENOMEM; 1218 1219 err = build_sadinfo(r_skb, net, sportid, seq, *flags); 1220 BUG_ON(err < 0); 1221 1222 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); 1223 } 1224 1225 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 1226 struct nlattr **attrs) 1227 { 1228 struct net *net = sock_net(skb->sk); 1229 struct xfrm_usersa_id *p = nlmsg_data(nlh); 1230 struct xfrm_state *x; 1231 struct sk_buff *resp_skb; 1232 int err = -ESRCH; 1233 1234 x = xfrm_user_state_lookup(net, p, attrs, &err); 1235 if (x == NULL) 1236 goto out_noput; 1237 1238 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 1239 if (IS_ERR(resp_skb)) { 1240 err = PTR_ERR(resp_skb); 1241 } else { 1242 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); 1243 } 1244 xfrm_state_put(x); 1245 out_noput: 1246 return err; 1247 } 1248 1249 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, 1250 struct nlattr **attrs) 1251 { 1252 struct net *net = sock_net(skb->sk); 1253 struct xfrm_state *x; 1254 struct xfrm_userspi_info *p; 1255 struct sk_buff *resp_skb; 1256 xfrm_address_t *daddr; 1257 int family; 1258 int err; 1259 u32 mark; 1260 struct xfrm_mark m; 1261 1262 p = nlmsg_data(nlh); 1263 err = verify_spi_info(p->info.id.proto, p->min, p->max); 1264 if (err) 1265 goto out_noput; 1266 1267 family = p->info.family; 1268 daddr = &p->info.id.daddr; 1269 1270 x = NULL; 1271 1272 mark = xfrm_mark_get(attrs, &m); 1273 if (p->info.seq) { 1274 x = xfrm_find_acq_byseq(net, mark, p->info.seq); 1275 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) { 1276 xfrm_state_put(x); 1277 x = NULL; 1278 } 1279 } 1280 1281 if (!x) 1282 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid, 1283 p->info.id.proto, daddr, 1284 &p->info.saddr, 1, 1285 family); 1286 err = -ENOENT; 1287 if (x == NULL) 1288 goto out_noput; 1289 1290 err = xfrm_alloc_spi(x, p->min, p->max); 1291 if (err) 1292 goto out; 1293 1294 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 1295 if (IS_ERR(resp_skb)) { 1296 err = PTR_ERR(resp_skb); 1297 goto out; 1298 } 1299 1300 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); 1301 1302 out: 1303 xfrm_state_put(x); 1304 out_noput: 1305 return err; 1306 } 1307 1308 static int verify_policy_dir(u8 dir) 1309 { 1310 switch (dir) { 1311 case XFRM_POLICY_IN: 1312 case XFRM_POLICY_OUT: 1313 case XFRM_POLICY_FWD: 1314 break; 1315 1316 default: 1317 return -EINVAL; 1318 } 1319 1320 return 0; 1321 } 1322 1323 static int verify_policy_type(u8 type) 1324 { 1325 switch (type) { 1326 case XFRM_POLICY_TYPE_MAIN: 1327 #ifdef CONFIG_XFRM_SUB_POLICY 1328 case XFRM_POLICY_TYPE_SUB: 1329 #endif 1330 break; 1331 1332 default: 1333 return -EINVAL; 1334 } 1335 1336 return 0; 1337 } 1338 1339 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p) 1340 { 1341 int ret; 1342 1343 switch (p->share) { 1344 case XFRM_SHARE_ANY: 1345 case XFRM_SHARE_SESSION: 1346 case XFRM_SHARE_USER: 1347 case XFRM_SHARE_UNIQUE: 1348 break; 1349 1350 default: 1351 return -EINVAL; 1352 } 1353 1354 switch (p->action) { 1355 case XFRM_POLICY_ALLOW: 1356 case XFRM_POLICY_BLOCK: 1357 break; 1358 1359 default: 1360 return -EINVAL; 1361 } 1362 1363 switch (p->sel.family) { 1364 case AF_INET: 1365 break; 1366 1367 case AF_INET6: 1368 #if IS_ENABLED(CONFIG_IPV6) 1369 break; 1370 #else 1371 return -EAFNOSUPPORT; 1372 #endif 1373 1374 default: 1375 return -EINVAL; 1376 } 1377 1378 ret = verify_policy_dir(p->dir); 1379 if (ret) 1380 return ret; 1381 if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir)) 1382 return -EINVAL; 1383 1384 return 0; 1385 } 1386 1387 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs) 1388 { 1389 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1390 struct xfrm_user_sec_ctx *uctx; 1391 1392 if (!rt) 1393 return 0; 1394 1395 uctx = nla_data(rt); 1396 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL); 1397 } 1398 1399 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut, 1400 int nr) 1401 { 1402 int i; 1403 1404 xp->xfrm_nr = nr; 1405 for (i = 0; i < nr; i++, ut++) { 1406 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 1407 1408 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id)); 1409 memcpy(&t->saddr, &ut->saddr, 1410 sizeof(xfrm_address_t)); 1411 t->reqid = ut->reqid; 1412 t->mode = ut->mode; 1413 t->share = ut->share; 1414 t->optional = ut->optional; 1415 t->aalgos = ut->aalgos; 1416 t->ealgos = ut->ealgos; 1417 t->calgos = ut->calgos; 1418 /* If all masks are ~0, then we allow all algorithms. */ 1419 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos); 1420 t->encap_family = ut->family; 1421 } 1422 } 1423 1424 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family) 1425 { 1426 u16 prev_family; 1427 int i; 1428 1429 if (nr > XFRM_MAX_DEPTH) 1430 return -EINVAL; 1431 1432 prev_family = family; 1433 1434 for (i = 0; i < nr; i++) { 1435 /* We never validated the ut->family value, so many 1436 * applications simply leave it at zero. The check was 1437 * never made and ut->family was ignored because all 1438 * templates could be assumed to have the same family as 1439 * the policy itself. Now that we will have ipv4-in-ipv6 1440 * and ipv6-in-ipv4 tunnels, this is no longer true. 1441 */ 1442 if (!ut[i].family) 1443 ut[i].family = family; 1444 1445 if ((ut[i].mode == XFRM_MODE_TRANSPORT) && 1446 (ut[i].family != prev_family)) 1447 return -EINVAL; 1448 1449 prev_family = ut[i].family; 1450 1451 switch (ut[i].family) { 1452 case AF_INET: 1453 break; 1454 #if IS_ENABLED(CONFIG_IPV6) 1455 case AF_INET6: 1456 break; 1457 #endif 1458 default: 1459 return -EINVAL; 1460 } 1461 1462 switch (ut[i].id.proto) { 1463 case IPPROTO_AH: 1464 case IPPROTO_ESP: 1465 case IPPROTO_COMP: 1466 #if IS_ENABLED(CONFIG_IPV6) 1467 case IPPROTO_ROUTING: 1468 case IPPROTO_DSTOPTS: 1469 #endif 1470 case IPSEC_PROTO_ANY: 1471 break; 1472 default: 1473 return -EINVAL; 1474 } 1475 1476 } 1477 1478 return 0; 1479 } 1480 1481 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs) 1482 { 1483 struct nlattr *rt = attrs[XFRMA_TMPL]; 1484 1485 if (!rt) { 1486 pol->xfrm_nr = 0; 1487 } else { 1488 struct xfrm_user_tmpl *utmpl = nla_data(rt); 1489 int nr = nla_len(rt) / sizeof(*utmpl); 1490 int err; 1491 1492 err = validate_tmpl(nr, utmpl, pol->family); 1493 if (err) 1494 return err; 1495 1496 copy_templates(pol, utmpl, nr); 1497 } 1498 return 0; 1499 } 1500 1501 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs) 1502 { 1503 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE]; 1504 struct xfrm_userpolicy_type *upt; 1505 u8 type = XFRM_POLICY_TYPE_MAIN; 1506 int err; 1507 1508 if (rt) { 1509 upt = nla_data(rt); 1510 type = upt->type; 1511 } 1512 1513 err = verify_policy_type(type); 1514 if (err) 1515 return err; 1516 1517 *tp = type; 1518 return 0; 1519 } 1520 1521 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p) 1522 { 1523 xp->priority = p->priority; 1524 xp->index = p->index; 1525 memcpy(&xp->selector, &p->sel, sizeof(xp->selector)); 1526 memcpy(&xp->lft, &p->lft, sizeof(xp->lft)); 1527 xp->action = p->action; 1528 xp->flags = p->flags; 1529 xp->family = p->sel.family; 1530 /* XXX xp->share = p->share; */ 1531 } 1532 1533 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir) 1534 { 1535 memset(p, 0, sizeof(*p)); 1536 memcpy(&p->sel, &xp->selector, sizeof(p->sel)); 1537 memcpy(&p->lft, &xp->lft, sizeof(p->lft)); 1538 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft)); 1539 p->priority = xp->priority; 1540 p->index = xp->index; 1541 p->sel.family = xp->family; 1542 p->dir = dir; 1543 p->action = xp->action; 1544 p->flags = xp->flags; 1545 p->share = XFRM_SHARE_ANY; /* XXX xp->share */ 1546 } 1547 1548 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp) 1549 { 1550 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL); 1551 int err; 1552 1553 if (!xp) { 1554 *errp = -ENOMEM; 1555 return NULL; 1556 } 1557 1558 copy_from_user_policy(xp, p); 1559 1560 err = copy_from_user_policy_type(&xp->type, attrs); 1561 if (err) 1562 goto error; 1563 1564 if (!(err = copy_from_user_tmpl(xp, attrs))) 1565 err = copy_from_user_sec_ctx(xp, attrs); 1566 if (err) 1567 goto error; 1568 1569 xfrm_mark_get(attrs, &xp->mark); 1570 1571 return xp; 1572 error: 1573 *errp = err; 1574 xp->walk.dead = 1; 1575 xfrm_policy_destroy(xp); 1576 return NULL; 1577 } 1578 1579 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1580 struct nlattr **attrs) 1581 { 1582 struct net *net = sock_net(skb->sk); 1583 struct xfrm_userpolicy_info *p = nlmsg_data(nlh); 1584 struct xfrm_policy *xp; 1585 struct km_event c; 1586 int err; 1587 int excl; 1588 1589 err = verify_newpolicy_info(p); 1590 if (err) 1591 return err; 1592 err = verify_sec_ctx_len(attrs); 1593 if (err) 1594 return err; 1595 1596 xp = xfrm_policy_construct(net, p, attrs, &err); 1597 if (!xp) 1598 return err; 1599 1600 /* shouldn't excl be based on nlh flags?? 1601 * Aha! this is anti-netlink really i.e more pfkey derived 1602 * in netlink excl is a flag and you wouldnt need 1603 * a type XFRM_MSG_UPDPOLICY - JHS */ 1604 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY; 1605 err = xfrm_policy_insert(p->dir, xp, excl); 1606 xfrm_audit_policy_add(xp, err ? 0 : 1, true); 1607 1608 if (err) { 1609 security_xfrm_policy_free(xp->security); 1610 kfree(xp); 1611 return err; 1612 } 1613 1614 c.event = nlh->nlmsg_type; 1615 c.seq = nlh->nlmsg_seq; 1616 c.portid = nlh->nlmsg_pid; 1617 km_policy_notify(xp, p->dir, &c); 1618 1619 xfrm_pol_put(xp); 1620 1621 return 0; 1622 } 1623 1624 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb) 1625 { 1626 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH]; 1627 int i; 1628 1629 if (xp->xfrm_nr == 0) 1630 return 0; 1631 1632 for (i = 0; i < xp->xfrm_nr; i++) { 1633 struct xfrm_user_tmpl *up = &vec[i]; 1634 struct xfrm_tmpl *kp = &xp->xfrm_vec[i]; 1635 1636 memset(up, 0, sizeof(*up)); 1637 memcpy(&up->id, &kp->id, sizeof(up->id)); 1638 up->family = kp->encap_family; 1639 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr)); 1640 up->reqid = kp->reqid; 1641 up->mode = kp->mode; 1642 up->share = kp->share; 1643 up->optional = kp->optional; 1644 up->aalgos = kp->aalgos; 1645 up->ealgos = kp->ealgos; 1646 up->calgos = kp->calgos; 1647 } 1648 1649 return nla_put(skb, XFRMA_TMPL, 1650 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec); 1651 } 1652 1653 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb) 1654 { 1655 if (x->security) { 1656 return copy_sec_ctx(x->security, skb); 1657 } 1658 return 0; 1659 } 1660 1661 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb) 1662 { 1663 if (xp->security) 1664 return copy_sec_ctx(xp->security, skb); 1665 return 0; 1666 } 1667 static inline unsigned int userpolicy_type_attrsize(void) 1668 { 1669 #ifdef CONFIG_XFRM_SUB_POLICY 1670 return nla_total_size(sizeof(struct xfrm_userpolicy_type)); 1671 #else 1672 return 0; 1673 #endif 1674 } 1675 1676 #ifdef CONFIG_XFRM_SUB_POLICY 1677 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1678 { 1679 struct xfrm_userpolicy_type upt = { 1680 .type = type, 1681 }; 1682 1683 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt); 1684 } 1685 1686 #else 1687 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1688 { 1689 return 0; 1690 } 1691 #endif 1692 1693 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr) 1694 { 1695 struct xfrm_dump_info *sp = ptr; 1696 struct xfrm_userpolicy_info *p; 1697 struct sk_buff *in_skb = sp->in_skb; 1698 struct sk_buff *skb = sp->out_skb; 1699 struct nlmsghdr *nlh; 1700 int err; 1701 1702 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, 1703 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags); 1704 if (nlh == NULL) 1705 return -EMSGSIZE; 1706 1707 p = nlmsg_data(nlh); 1708 copy_to_user_policy(xp, p, dir); 1709 err = copy_to_user_tmpl(xp, skb); 1710 if (!err) 1711 err = copy_to_user_sec_ctx(xp, skb); 1712 if (!err) 1713 err = copy_to_user_policy_type(xp->type, skb); 1714 if (!err) 1715 err = xfrm_mark_put(skb, &xp->mark); 1716 if (err) { 1717 nlmsg_cancel(skb, nlh); 1718 return err; 1719 } 1720 nlmsg_end(skb, nlh); 1721 return 0; 1722 } 1723 1724 static int xfrm_dump_policy_done(struct netlink_callback *cb) 1725 { 1726 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args; 1727 struct net *net = sock_net(cb->skb->sk); 1728 1729 xfrm_policy_walk_done(walk, net); 1730 return 0; 1731 } 1732 1733 static int xfrm_dump_policy_start(struct netlink_callback *cb) 1734 { 1735 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args; 1736 1737 BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args)); 1738 1739 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY); 1740 return 0; 1741 } 1742 1743 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb) 1744 { 1745 struct net *net = sock_net(skb->sk); 1746 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args; 1747 struct xfrm_dump_info info; 1748 1749 info.in_skb = cb->skb; 1750 info.out_skb = skb; 1751 info.nlmsg_seq = cb->nlh->nlmsg_seq; 1752 info.nlmsg_flags = NLM_F_MULTI; 1753 1754 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info); 1755 1756 return skb->len; 1757 } 1758 1759 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb, 1760 struct xfrm_policy *xp, 1761 int dir, u32 seq) 1762 { 1763 struct xfrm_dump_info info; 1764 struct sk_buff *skb; 1765 int err; 1766 1767 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1768 if (!skb) 1769 return ERR_PTR(-ENOMEM); 1770 1771 info.in_skb = in_skb; 1772 info.out_skb = skb; 1773 info.nlmsg_seq = seq; 1774 info.nlmsg_flags = 0; 1775 1776 err = dump_one_policy(xp, dir, 0, &info); 1777 if (err) { 1778 kfree_skb(skb); 1779 return ERR_PTR(err); 1780 } 1781 1782 return skb; 1783 } 1784 1785 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1786 struct nlattr **attrs) 1787 { 1788 struct net *net = sock_net(skb->sk); 1789 struct xfrm_policy *xp; 1790 struct xfrm_userpolicy_id *p; 1791 u8 type = XFRM_POLICY_TYPE_MAIN; 1792 int err; 1793 struct km_event c; 1794 int delete; 1795 struct xfrm_mark m; 1796 u32 mark = xfrm_mark_get(attrs, &m); 1797 1798 p = nlmsg_data(nlh); 1799 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY; 1800 1801 err = copy_from_user_policy_type(&type, attrs); 1802 if (err) 1803 return err; 1804 1805 err = verify_policy_dir(p->dir); 1806 if (err) 1807 return err; 1808 1809 if (p->index) 1810 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err); 1811 else { 1812 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1813 struct xfrm_sec_ctx *ctx; 1814 1815 err = verify_sec_ctx_len(attrs); 1816 if (err) 1817 return err; 1818 1819 ctx = NULL; 1820 if (rt) { 1821 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 1822 1823 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); 1824 if (err) 1825 return err; 1826 } 1827 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel, 1828 ctx, delete, &err); 1829 security_xfrm_policy_free(ctx); 1830 } 1831 if (xp == NULL) 1832 return -ENOENT; 1833 1834 if (!delete) { 1835 struct sk_buff *resp_skb; 1836 1837 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq); 1838 if (IS_ERR(resp_skb)) { 1839 err = PTR_ERR(resp_skb); 1840 } else { 1841 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, 1842 NETLINK_CB(skb).portid); 1843 } 1844 } else { 1845 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 1846 1847 if (err != 0) 1848 goto out; 1849 1850 c.data.byid = p->index; 1851 c.event = nlh->nlmsg_type; 1852 c.seq = nlh->nlmsg_seq; 1853 c.portid = nlh->nlmsg_pid; 1854 km_policy_notify(xp, p->dir, &c); 1855 } 1856 1857 out: 1858 xfrm_pol_put(xp); 1859 return err; 1860 } 1861 1862 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 1863 struct nlattr **attrs) 1864 { 1865 struct net *net = sock_net(skb->sk); 1866 struct km_event c; 1867 struct xfrm_usersa_flush *p = nlmsg_data(nlh); 1868 int err; 1869 1870 err = xfrm_state_flush(net, p->proto, true); 1871 if (err) { 1872 if (err == -ESRCH) /* empty table */ 1873 return 0; 1874 return err; 1875 } 1876 c.data.proto = p->proto; 1877 c.event = nlh->nlmsg_type; 1878 c.seq = nlh->nlmsg_seq; 1879 c.portid = nlh->nlmsg_pid; 1880 c.net = net; 1881 km_state_notify(NULL, &c); 1882 1883 return 0; 1884 } 1885 1886 static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x) 1887 { 1888 unsigned int replay_size = x->replay_esn ? 1889 xfrm_replay_state_esn_len(x->replay_esn) : 1890 sizeof(struct xfrm_replay_state); 1891 1892 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id)) 1893 + nla_total_size(replay_size) 1894 + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur)) 1895 + nla_total_size(sizeof(struct xfrm_mark)) 1896 + nla_total_size(4) /* XFRM_AE_RTHR */ 1897 + nla_total_size(4); /* XFRM_AE_ETHR */ 1898 } 1899 1900 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 1901 { 1902 struct xfrm_aevent_id *id; 1903 struct nlmsghdr *nlh; 1904 int err; 1905 1906 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0); 1907 if (nlh == NULL) 1908 return -EMSGSIZE; 1909 1910 id = nlmsg_data(nlh); 1911 memset(&id->sa_id, 0, sizeof(id->sa_id)); 1912 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr)); 1913 id->sa_id.spi = x->id.spi; 1914 id->sa_id.family = x->props.family; 1915 id->sa_id.proto = x->id.proto; 1916 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr)); 1917 id->reqid = x->props.reqid; 1918 id->flags = c->data.aevent; 1919 1920 if (x->replay_esn) { 1921 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL, 1922 xfrm_replay_state_esn_len(x->replay_esn), 1923 x->replay_esn); 1924 } else { 1925 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), 1926 &x->replay); 1927 } 1928 if (err) 1929 goto out_cancel; 1930 err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft, 1931 XFRMA_PAD); 1932 if (err) 1933 goto out_cancel; 1934 1935 if (id->flags & XFRM_AE_RTHR) { 1936 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff); 1937 if (err) 1938 goto out_cancel; 1939 } 1940 if (id->flags & XFRM_AE_ETHR) { 1941 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH, 1942 x->replay_maxage * 10 / HZ); 1943 if (err) 1944 goto out_cancel; 1945 } 1946 err = xfrm_mark_put(skb, &x->mark); 1947 if (err) 1948 goto out_cancel; 1949 1950 nlmsg_end(skb, nlh); 1951 return 0; 1952 1953 out_cancel: 1954 nlmsg_cancel(skb, nlh); 1955 return err; 1956 } 1957 1958 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 1959 struct nlattr **attrs) 1960 { 1961 struct net *net = sock_net(skb->sk); 1962 struct xfrm_state *x; 1963 struct sk_buff *r_skb; 1964 int err; 1965 struct km_event c; 1966 u32 mark; 1967 struct xfrm_mark m; 1968 struct xfrm_aevent_id *p = nlmsg_data(nlh); 1969 struct xfrm_usersa_id *id = &p->sa_id; 1970 1971 mark = xfrm_mark_get(attrs, &m); 1972 1973 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family); 1974 if (x == NULL) 1975 return -ESRCH; 1976 1977 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 1978 if (r_skb == NULL) { 1979 xfrm_state_put(x); 1980 return -ENOMEM; 1981 } 1982 1983 /* 1984 * XXX: is this lock really needed - none of the other 1985 * gets lock (the concern is things getting updated 1986 * while we are still reading) - jhs 1987 */ 1988 spin_lock_bh(&x->lock); 1989 c.data.aevent = p->flags; 1990 c.seq = nlh->nlmsg_seq; 1991 c.portid = nlh->nlmsg_pid; 1992 1993 err = build_aevent(r_skb, x, &c); 1994 BUG_ON(err < 0); 1995 1996 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid); 1997 spin_unlock_bh(&x->lock); 1998 xfrm_state_put(x); 1999 return err; 2000 } 2001 2002 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 2003 struct nlattr **attrs) 2004 { 2005 struct net *net = sock_net(skb->sk); 2006 struct xfrm_state *x; 2007 struct km_event c; 2008 int err = -EINVAL; 2009 u32 mark = 0; 2010 struct xfrm_mark m; 2011 struct xfrm_aevent_id *p = nlmsg_data(nlh); 2012 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 2013 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL]; 2014 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 2015 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; 2016 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; 2017 2018 if (!lt && !rp && !re && !et && !rt) 2019 return err; 2020 2021 /* pedantic mode - thou shalt sayeth replaceth */ 2022 if (!(nlh->nlmsg_flags&NLM_F_REPLACE)) 2023 return err; 2024 2025 mark = xfrm_mark_get(attrs, &m); 2026 2027 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family); 2028 if (x == NULL) 2029 return -ESRCH; 2030 2031 if (x->km.state != XFRM_STATE_VALID) 2032 goto out; 2033 2034 err = xfrm_replay_verify_len(x->replay_esn, re); 2035 if (err) 2036 goto out; 2037 2038 spin_lock_bh(&x->lock); 2039 xfrm_update_ae_params(x, attrs, 1); 2040 spin_unlock_bh(&x->lock); 2041 2042 c.event = nlh->nlmsg_type; 2043 c.seq = nlh->nlmsg_seq; 2044 c.portid = nlh->nlmsg_pid; 2045 c.data.aevent = XFRM_AE_CU; 2046 km_state_notify(x, &c); 2047 err = 0; 2048 out: 2049 xfrm_state_put(x); 2050 return err; 2051 } 2052 2053 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 2054 struct nlattr **attrs) 2055 { 2056 struct net *net = sock_net(skb->sk); 2057 struct km_event c; 2058 u8 type = XFRM_POLICY_TYPE_MAIN; 2059 int err; 2060 2061 err = copy_from_user_policy_type(&type, attrs); 2062 if (err) 2063 return err; 2064 2065 err = xfrm_policy_flush(net, type, true); 2066 if (err) { 2067 if (err == -ESRCH) /* empty table */ 2068 return 0; 2069 return err; 2070 } 2071 2072 c.data.type = type; 2073 c.event = nlh->nlmsg_type; 2074 c.seq = nlh->nlmsg_seq; 2075 c.portid = nlh->nlmsg_pid; 2076 c.net = net; 2077 km_policy_notify(NULL, 0, &c); 2078 return 0; 2079 } 2080 2081 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 2082 struct nlattr **attrs) 2083 { 2084 struct net *net = sock_net(skb->sk); 2085 struct xfrm_policy *xp; 2086 struct xfrm_user_polexpire *up = nlmsg_data(nlh); 2087 struct xfrm_userpolicy_info *p = &up->pol; 2088 u8 type = XFRM_POLICY_TYPE_MAIN; 2089 int err = -ENOENT; 2090 struct xfrm_mark m; 2091 u32 mark = xfrm_mark_get(attrs, &m); 2092 2093 err = copy_from_user_policy_type(&type, attrs); 2094 if (err) 2095 return err; 2096 2097 err = verify_policy_dir(p->dir); 2098 if (err) 2099 return err; 2100 2101 if (p->index) 2102 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err); 2103 else { 2104 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 2105 struct xfrm_sec_ctx *ctx; 2106 2107 err = verify_sec_ctx_len(attrs); 2108 if (err) 2109 return err; 2110 2111 ctx = NULL; 2112 if (rt) { 2113 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 2114 2115 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); 2116 if (err) 2117 return err; 2118 } 2119 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, 2120 &p->sel, ctx, 0, &err); 2121 security_xfrm_policy_free(ctx); 2122 } 2123 if (xp == NULL) 2124 return -ENOENT; 2125 2126 if (unlikely(xp->walk.dead)) 2127 goto out; 2128 2129 err = 0; 2130 if (up->hard) { 2131 xfrm_policy_delete(xp, p->dir); 2132 xfrm_audit_policy_delete(xp, 1, true); 2133 } 2134 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid); 2135 2136 out: 2137 xfrm_pol_put(xp); 2138 return err; 2139 } 2140 2141 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 2142 struct nlattr **attrs) 2143 { 2144 struct net *net = sock_net(skb->sk); 2145 struct xfrm_state *x; 2146 int err; 2147 struct xfrm_user_expire *ue = nlmsg_data(nlh); 2148 struct xfrm_usersa_info *p = &ue->state; 2149 struct xfrm_mark m; 2150 u32 mark = xfrm_mark_get(attrs, &m); 2151 2152 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family); 2153 2154 err = -ENOENT; 2155 if (x == NULL) 2156 return err; 2157 2158 spin_lock_bh(&x->lock); 2159 err = -EINVAL; 2160 if (x->km.state != XFRM_STATE_VALID) 2161 goto out; 2162 km_state_expired(x, ue->hard, nlh->nlmsg_pid); 2163 2164 if (ue->hard) { 2165 __xfrm_state_delete(x); 2166 xfrm_audit_state_delete(x, 1, true); 2167 } 2168 err = 0; 2169 out: 2170 spin_unlock_bh(&x->lock); 2171 xfrm_state_put(x); 2172 return err; 2173 } 2174 2175 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, 2176 struct nlattr **attrs) 2177 { 2178 struct net *net = sock_net(skb->sk); 2179 struct xfrm_policy *xp; 2180 struct xfrm_user_tmpl *ut; 2181 int i; 2182 struct nlattr *rt = attrs[XFRMA_TMPL]; 2183 struct xfrm_mark mark; 2184 2185 struct xfrm_user_acquire *ua = nlmsg_data(nlh); 2186 struct xfrm_state *x = xfrm_state_alloc(net); 2187 int err = -ENOMEM; 2188 2189 if (!x) 2190 goto nomem; 2191 2192 xfrm_mark_get(attrs, &mark); 2193 2194 err = verify_newpolicy_info(&ua->policy); 2195 if (err) 2196 goto free_state; 2197 2198 /* build an XP */ 2199 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err); 2200 if (!xp) 2201 goto free_state; 2202 2203 memcpy(&x->id, &ua->id, sizeof(ua->id)); 2204 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr)); 2205 memcpy(&x->sel, &ua->sel, sizeof(ua->sel)); 2206 xp->mark.m = x->mark.m = mark.m; 2207 xp->mark.v = x->mark.v = mark.v; 2208 ut = nla_data(rt); 2209 /* extract the templates and for each call km_key */ 2210 for (i = 0; i < xp->xfrm_nr; i++, ut++) { 2211 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 2212 memcpy(&x->id, &t->id, sizeof(x->id)); 2213 x->props.mode = t->mode; 2214 x->props.reqid = t->reqid; 2215 x->props.family = ut->family; 2216 t->aalgos = ua->aalgos; 2217 t->ealgos = ua->ealgos; 2218 t->calgos = ua->calgos; 2219 err = km_query(x, t, xp); 2220 2221 } 2222 2223 kfree(x); 2224 kfree(xp); 2225 2226 return 0; 2227 2228 free_state: 2229 kfree(x); 2230 nomem: 2231 return err; 2232 } 2233 2234 #ifdef CONFIG_XFRM_MIGRATE 2235 static int copy_from_user_migrate(struct xfrm_migrate *ma, 2236 struct xfrm_kmaddress *k, 2237 struct nlattr **attrs, int *num) 2238 { 2239 struct nlattr *rt = attrs[XFRMA_MIGRATE]; 2240 struct xfrm_user_migrate *um; 2241 int i, num_migrate; 2242 2243 if (k != NULL) { 2244 struct xfrm_user_kmaddress *uk; 2245 2246 uk = nla_data(attrs[XFRMA_KMADDRESS]); 2247 memcpy(&k->local, &uk->local, sizeof(k->local)); 2248 memcpy(&k->remote, &uk->remote, sizeof(k->remote)); 2249 k->family = uk->family; 2250 k->reserved = uk->reserved; 2251 } 2252 2253 um = nla_data(rt); 2254 num_migrate = nla_len(rt) / sizeof(*um); 2255 2256 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH) 2257 return -EINVAL; 2258 2259 for (i = 0; i < num_migrate; i++, um++, ma++) { 2260 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr)); 2261 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr)); 2262 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr)); 2263 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr)); 2264 2265 ma->proto = um->proto; 2266 ma->mode = um->mode; 2267 ma->reqid = um->reqid; 2268 2269 ma->old_family = um->old_family; 2270 ma->new_family = um->new_family; 2271 } 2272 2273 *num = i; 2274 return 0; 2275 } 2276 2277 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 2278 struct nlattr **attrs) 2279 { 2280 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh); 2281 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 2282 struct xfrm_kmaddress km, *kmp; 2283 u8 type; 2284 int err; 2285 int n = 0; 2286 struct net *net = sock_net(skb->sk); 2287 struct xfrm_encap_tmpl *encap = NULL; 2288 2289 if (attrs[XFRMA_MIGRATE] == NULL) 2290 return -EINVAL; 2291 2292 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL; 2293 2294 err = copy_from_user_policy_type(&type, attrs); 2295 if (err) 2296 return err; 2297 2298 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n); 2299 if (err) 2300 return err; 2301 2302 if (!n) 2303 return 0; 2304 2305 if (attrs[XFRMA_ENCAP]) { 2306 encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]), 2307 sizeof(*encap), GFP_KERNEL); 2308 if (!encap) 2309 return 0; 2310 } 2311 2312 err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap); 2313 2314 kfree(encap); 2315 2316 return err; 2317 } 2318 #else 2319 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 2320 struct nlattr **attrs) 2321 { 2322 return -ENOPROTOOPT; 2323 } 2324 #endif 2325 2326 #ifdef CONFIG_XFRM_MIGRATE 2327 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb) 2328 { 2329 struct xfrm_user_migrate um; 2330 2331 memset(&um, 0, sizeof(um)); 2332 um.proto = m->proto; 2333 um.mode = m->mode; 2334 um.reqid = m->reqid; 2335 um.old_family = m->old_family; 2336 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr)); 2337 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr)); 2338 um.new_family = m->new_family; 2339 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr)); 2340 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr)); 2341 2342 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um); 2343 } 2344 2345 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb) 2346 { 2347 struct xfrm_user_kmaddress uk; 2348 2349 memset(&uk, 0, sizeof(uk)); 2350 uk.family = k->family; 2351 uk.reserved = k->reserved; 2352 memcpy(&uk.local, &k->local, sizeof(uk.local)); 2353 memcpy(&uk.remote, &k->remote, sizeof(uk.remote)); 2354 2355 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk); 2356 } 2357 2358 static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma, 2359 int with_encp) 2360 { 2361 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id)) 2362 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0) 2363 + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0) 2364 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate) 2365 + userpolicy_type_attrsize(); 2366 } 2367 2368 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m, 2369 int num_migrate, const struct xfrm_kmaddress *k, 2370 const struct xfrm_selector *sel, 2371 const struct xfrm_encap_tmpl *encap, u8 dir, u8 type) 2372 { 2373 const struct xfrm_migrate *mp; 2374 struct xfrm_userpolicy_id *pol_id; 2375 struct nlmsghdr *nlh; 2376 int i, err; 2377 2378 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0); 2379 if (nlh == NULL) 2380 return -EMSGSIZE; 2381 2382 pol_id = nlmsg_data(nlh); 2383 /* copy data from selector, dir, and type to the pol_id */ 2384 memset(pol_id, 0, sizeof(*pol_id)); 2385 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel)); 2386 pol_id->dir = dir; 2387 2388 if (k != NULL) { 2389 err = copy_to_user_kmaddress(k, skb); 2390 if (err) 2391 goto out_cancel; 2392 } 2393 if (encap) { 2394 err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap); 2395 if (err) 2396 goto out_cancel; 2397 } 2398 err = copy_to_user_policy_type(type, skb); 2399 if (err) 2400 goto out_cancel; 2401 for (i = 0, mp = m ; i < num_migrate; i++, mp++) { 2402 err = copy_to_user_migrate(mp, skb); 2403 if (err) 2404 goto out_cancel; 2405 } 2406 2407 nlmsg_end(skb, nlh); 2408 return 0; 2409 2410 out_cancel: 2411 nlmsg_cancel(skb, nlh); 2412 return err; 2413 } 2414 2415 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2416 const struct xfrm_migrate *m, int num_migrate, 2417 const struct xfrm_kmaddress *k, 2418 const struct xfrm_encap_tmpl *encap) 2419 { 2420 struct net *net = &init_net; 2421 struct sk_buff *skb; 2422 int err; 2423 2424 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap), 2425 GFP_ATOMIC); 2426 if (skb == NULL) 2427 return -ENOMEM; 2428 2429 /* build migrate */ 2430 err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type); 2431 BUG_ON(err < 0); 2432 2433 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE); 2434 } 2435 #else 2436 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2437 const struct xfrm_migrate *m, int num_migrate, 2438 const struct xfrm_kmaddress *k, 2439 const struct xfrm_encap_tmpl *encap) 2440 { 2441 return -ENOPROTOOPT; 2442 } 2443 #endif 2444 2445 #define XMSGSIZE(type) sizeof(struct type) 2446 2447 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = { 2448 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2449 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2450 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2451 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2452 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2453 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2454 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info), 2455 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire), 2456 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire), 2457 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2458 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2459 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire), 2460 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush), 2461 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0, 2462 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2463 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2464 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report), 2465 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2466 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32), 2467 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 2468 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 2469 }; 2470 2471 #undef XMSGSIZE 2472 2473 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = { 2474 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)}, 2475 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)}, 2476 [XFRMA_LASTUSED] = { .type = NLA_U64}, 2477 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)}, 2478 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) }, 2479 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) }, 2480 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) }, 2481 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) }, 2482 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) }, 2483 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) }, 2484 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) }, 2485 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) }, 2486 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) }, 2487 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 }, 2488 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 }, 2489 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) }, 2490 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) }, 2491 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)}, 2492 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) }, 2493 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) }, 2494 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) }, 2495 [XFRMA_TFCPAD] = { .type = NLA_U32 }, 2496 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) }, 2497 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 }, 2498 [XFRMA_PROTO] = { .type = NLA_U8 }, 2499 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) }, 2500 [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) }, 2501 [XFRMA_OUTPUT_MARK] = { .type = NLA_U32 }, 2502 }; 2503 2504 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = { 2505 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) }, 2506 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) }, 2507 }; 2508 2509 static const struct xfrm_link { 2510 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **); 2511 int (*start)(struct netlink_callback *); 2512 int (*dump)(struct sk_buff *, struct netlink_callback *); 2513 int (*done)(struct netlink_callback *); 2514 const struct nla_policy *nla_pol; 2515 int nla_max; 2516 } xfrm_dispatch[XFRM_NR_MSGTYPES] = { 2517 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 2518 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa }, 2519 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa, 2520 .dump = xfrm_dump_sa, 2521 .done = xfrm_dump_sa_done }, 2522 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 2523 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy }, 2524 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy, 2525 .start = xfrm_dump_policy_start, 2526 .dump = xfrm_dump_policy, 2527 .done = xfrm_dump_policy_done }, 2528 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi }, 2529 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire }, 2530 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire }, 2531 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 2532 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 2533 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire}, 2534 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa }, 2535 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy }, 2536 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae }, 2537 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae }, 2538 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate }, 2539 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo }, 2540 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo, 2541 .nla_pol = xfrma_spd_policy, 2542 .nla_max = XFRMA_SPD_MAX }, 2543 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo }, 2544 }; 2545 2546 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, 2547 struct netlink_ext_ack *extack) 2548 { 2549 struct net *net = sock_net(skb->sk); 2550 struct nlattr *attrs[XFRMA_MAX+1]; 2551 const struct xfrm_link *link; 2552 int type, err; 2553 2554 #ifdef CONFIG_COMPAT 2555 if (in_compat_syscall()) 2556 return -EOPNOTSUPP; 2557 #endif 2558 2559 type = nlh->nlmsg_type; 2560 if (type > XFRM_MSG_MAX) 2561 return -EINVAL; 2562 2563 type -= XFRM_MSG_BASE; 2564 link = &xfrm_dispatch[type]; 2565 2566 /* All operations require privileges, even GET */ 2567 if (!netlink_net_capable(skb, CAP_NET_ADMIN)) 2568 return -EPERM; 2569 2570 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) || 2571 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) && 2572 (nlh->nlmsg_flags & NLM_F_DUMP)) { 2573 if (link->dump == NULL) 2574 return -EINVAL; 2575 2576 { 2577 struct netlink_dump_control c = { 2578 .start = link->start, 2579 .dump = link->dump, 2580 .done = link->done, 2581 }; 2582 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c); 2583 } 2584 } 2585 2586 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, 2587 link->nla_max ? : XFRMA_MAX, 2588 link->nla_pol ? : xfrma_policy, extack); 2589 if (err < 0) 2590 return err; 2591 2592 if (link->doit == NULL) 2593 return -EINVAL; 2594 2595 return link->doit(skb, nlh, attrs); 2596 } 2597 2598 static void xfrm_netlink_rcv(struct sk_buff *skb) 2599 { 2600 struct net *net = sock_net(skb->sk); 2601 2602 mutex_lock(&net->xfrm.xfrm_cfg_mutex); 2603 netlink_rcv_skb(skb, &xfrm_user_rcv_msg); 2604 mutex_unlock(&net->xfrm.xfrm_cfg_mutex); 2605 } 2606 2607 static inline unsigned int xfrm_expire_msgsize(void) 2608 { 2609 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire)) 2610 + nla_total_size(sizeof(struct xfrm_mark)); 2611 } 2612 2613 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 2614 { 2615 struct xfrm_user_expire *ue; 2616 struct nlmsghdr *nlh; 2617 int err; 2618 2619 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0); 2620 if (nlh == NULL) 2621 return -EMSGSIZE; 2622 2623 ue = nlmsg_data(nlh); 2624 copy_to_user_state(x, &ue->state); 2625 ue->hard = (c->data.hard != 0) ? 1 : 0; 2626 /* clear the padding bytes */ 2627 memset(&ue->hard + 1, 0, sizeof(*ue) - offsetofend(typeof(*ue), hard)); 2628 2629 err = xfrm_mark_put(skb, &x->mark); 2630 if (err) 2631 return err; 2632 2633 nlmsg_end(skb, nlh); 2634 return 0; 2635 } 2636 2637 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c) 2638 { 2639 struct net *net = xs_net(x); 2640 struct sk_buff *skb; 2641 2642 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC); 2643 if (skb == NULL) 2644 return -ENOMEM; 2645 2646 if (build_expire(skb, x, c) < 0) { 2647 kfree_skb(skb); 2648 return -EMSGSIZE; 2649 } 2650 2651 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE); 2652 } 2653 2654 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c) 2655 { 2656 struct net *net = xs_net(x); 2657 struct sk_buff *skb; 2658 int err; 2659 2660 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 2661 if (skb == NULL) 2662 return -ENOMEM; 2663 2664 err = build_aevent(skb, x, c); 2665 BUG_ON(err < 0); 2666 2667 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS); 2668 } 2669 2670 static int xfrm_notify_sa_flush(const struct km_event *c) 2671 { 2672 struct net *net = c->net; 2673 struct xfrm_usersa_flush *p; 2674 struct nlmsghdr *nlh; 2675 struct sk_buff *skb; 2676 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush)); 2677 2678 skb = nlmsg_new(len, GFP_ATOMIC); 2679 if (skb == NULL) 2680 return -ENOMEM; 2681 2682 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0); 2683 if (nlh == NULL) { 2684 kfree_skb(skb); 2685 return -EMSGSIZE; 2686 } 2687 2688 p = nlmsg_data(nlh); 2689 p->proto = c->data.proto; 2690 2691 nlmsg_end(skb, nlh); 2692 2693 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA); 2694 } 2695 2696 static inline unsigned int xfrm_sa_len(struct xfrm_state *x) 2697 { 2698 unsigned int l = 0; 2699 if (x->aead) 2700 l += nla_total_size(aead_len(x->aead)); 2701 if (x->aalg) { 2702 l += nla_total_size(sizeof(struct xfrm_algo) + 2703 (x->aalg->alg_key_len + 7) / 8); 2704 l += nla_total_size(xfrm_alg_auth_len(x->aalg)); 2705 } 2706 if (x->ealg) 2707 l += nla_total_size(xfrm_alg_len(x->ealg)); 2708 if (x->calg) 2709 l += nla_total_size(sizeof(*x->calg)); 2710 if (x->encap) 2711 l += nla_total_size(sizeof(*x->encap)); 2712 if (x->tfcpad) 2713 l += nla_total_size(sizeof(x->tfcpad)); 2714 if (x->replay_esn) 2715 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn)); 2716 else 2717 l += nla_total_size(sizeof(struct xfrm_replay_state)); 2718 if (x->security) 2719 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) + 2720 x->security->ctx_len); 2721 if (x->coaddr) 2722 l += nla_total_size(sizeof(*x->coaddr)); 2723 if (x->props.extra_flags) 2724 l += nla_total_size(sizeof(x->props.extra_flags)); 2725 if (x->xso.dev) 2726 l += nla_total_size(sizeof(x->xso)); 2727 if (x->props.output_mark) 2728 l += nla_total_size(sizeof(x->props.output_mark)); 2729 2730 /* Must count x->lastused as it may become non-zero behind our back. */ 2731 l += nla_total_size_64bit(sizeof(u64)); 2732 2733 return l; 2734 } 2735 2736 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c) 2737 { 2738 struct net *net = xs_net(x); 2739 struct xfrm_usersa_info *p; 2740 struct xfrm_usersa_id *id; 2741 struct nlmsghdr *nlh; 2742 struct sk_buff *skb; 2743 unsigned int len = xfrm_sa_len(x); 2744 unsigned int headlen; 2745 int err; 2746 2747 headlen = sizeof(*p); 2748 if (c->event == XFRM_MSG_DELSA) { 2749 len += nla_total_size(headlen); 2750 headlen = sizeof(*id); 2751 len += nla_total_size(sizeof(struct xfrm_mark)); 2752 } 2753 len += NLMSG_ALIGN(headlen); 2754 2755 skb = nlmsg_new(len, GFP_ATOMIC); 2756 if (skb == NULL) 2757 return -ENOMEM; 2758 2759 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); 2760 err = -EMSGSIZE; 2761 if (nlh == NULL) 2762 goto out_free_skb; 2763 2764 p = nlmsg_data(nlh); 2765 if (c->event == XFRM_MSG_DELSA) { 2766 struct nlattr *attr; 2767 2768 id = nlmsg_data(nlh); 2769 memset(id, 0, sizeof(*id)); 2770 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr)); 2771 id->spi = x->id.spi; 2772 id->family = x->props.family; 2773 id->proto = x->id.proto; 2774 2775 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p)); 2776 err = -EMSGSIZE; 2777 if (attr == NULL) 2778 goto out_free_skb; 2779 2780 p = nla_data(attr); 2781 } 2782 err = copy_to_user_state_extra(x, p, skb); 2783 if (err) 2784 goto out_free_skb; 2785 2786 nlmsg_end(skb, nlh); 2787 2788 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA); 2789 2790 out_free_skb: 2791 kfree_skb(skb); 2792 return err; 2793 } 2794 2795 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c) 2796 { 2797 2798 switch (c->event) { 2799 case XFRM_MSG_EXPIRE: 2800 return xfrm_exp_state_notify(x, c); 2801 case XFRM_MSG_NEWAE: 2802 return xfrm_aevent_state_notify(x, c); 2803 case XFRM_MSG_DELSA: 2804 case XFRM_MSG_UPDSA: 2805 case XFRM_MSG_NEWSA: 2806 return xfrm_notify_sa(x, c); 2807 case XFRM_MSG_FLUSHSA: 2808 return xfrm_notify_sa_flush(c); 2809 default: 2810 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n", 2811 c->event); 2812 break; 2813 } 2814 2815 return 0; 2816 2817 } 2818 2819 static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x, 2820 struct xfrm_policy *xp) 2821 { 2822 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire)) 2823 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 2824 + nla_total_size(sizeof(struct xfrm_mark)) 2825 + nla_total_size(xfrm_user_sec_ctx_size(x->security)) 2826 + userpolicy_type_attrsize(); 2827 } 2828 2829 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x, 2830 struct xfrm_tmpl *xt, struct xfrm_policy *xp) 2831 { 2832 __u32 seq = xfrm_get_acqseq(); 2833 struct xfrm_user_acquire *ua; 2834 struct nlmsghdr *nlh; 2835 int err; 2836 2837 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0); 2838 if (nlh == NULL) 2839 return -EMSGSIZE; 2840 2841 ua = nlmsg_data(nlh); 2842 memcpy(&ua->id, &x->id, sizeof(ua->id)); 2843 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr)); 2844 memcpy(&ua->sel, &x->sel, sizeof(ua->sel)); 2845 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT); 2846 ua->aalgos = xt->aalgos; 2847 ua->ealgos = xt->ealgos; 2848 ua->calgos = xt->calgos; 2849 ua->seq = x->km.seq = seq; 2850 2851 err = copy_to_user_tmpl(xp, skb); 2852 if (!err) 2853 err = copy_to_user_state_sec_ctx(x, skb); 2854 if (!err) 2855 err = copy_to_user_policy_type(xp->type, skb); 2856 if (!err) 2857 err = xfrm_mark_put(skb, &xp->mark); 2858 if (err) { 2859 nlmsg_cancel(skb, nlh); 2860 return err; 2861 } 2862 2863 nlmsg_end(skb, nlh); 2864 return 0; 2865 } 2866 2867 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt, 2868 struct xfrm_policy *xp) 2869 { 2870 struct net *net = xs_net(x); 2871 struct sk_buff *skb; 2872 int err; 2873 2874 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC); 2875 if (skb == NULL) 2876 return -ENOMEM; 2877 2878 err = build_acquire(skb, x, xt, xp); 2879 BUG_ON(err < 0); 2880 2881 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE); 2882 } 2883 2884 /* User gives us xfrm_user_policy_info followed by an array of 0 2885 * or more templates. 2886 */ 2887 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt, 2888 u8 *data, int len, int *dir) 2889 { 2890 struct net *net = sock_net(sk); 2891 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data; 2892 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1); 2893 struct xfrm_policy *xp; 2894 int nr; 2895 2896 switch (sk->sk_family) { 2897 case AF_INET: 2898 if (opt != IP_XFRM_POLICY) { 2899 *dir = -EOPNOTSUPP; 2900 return NULL; 2901 } 2902 break; 2903 #if IS_ENABLED(CONFIG_IPV6) 2904 case AF_INET6: 2905 if (opt != IPV6_XFRM_POLICY) { 2906 *dir = -EOPNOTSUPP; 2907 return NULL; 2908 } 2909 break; 2910 #endif 2911 default: 2912 *dir = -EINVAL; 2913 return NULL; 2914 } 2915 2916 *dir = -EINVAL; 2917 2918 if (len < sizeof(*p) || 2919 verify_newpolicy_info(p)) 2920 return NULL; 2921 2922 nr = ((len - sizeof(*p)) / sizeof(*ut)); 2923 if (validate_tmpl(nr, ut, p->sel.family)) 2924 return NULL; 2925 2926 if (p->dir > XFRM_POLICY_OUT) 2927 return NULL; 2928 2929 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 2930 if (xp == NULL) { 2931 *dir = -ENOBUFS; 2932 return NULL; 2933 } 2934 2935 copy_from_user_policy(xp, p); 2936 xp->type = XFRM_POLICY_TYPE_MAIN; 2937 copy_templates(xp, ut, nr); 2938 2939 *dir = p->dir; 2940 2941 return xp; 2942 } 2943 2944 static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp) 2945 { 2946 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire)) 2947 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 2948 + nla_total_size(xfrm_user_sec_ctx_size(xp->security)) 2949 + nla_total_size(sizeof(struct xfrm_mark)) 2950 + userpolicy_type_attrsize(); 2951 } 2952 2953 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp, 2954 int dir, const struct km_event *c) 2955 { 2956 struct xfrm_user_polexpire *upe; 2957 int hard = c->data.hard; 2958 struct nlmsghdr *nlh; 2959 int err; 2960 2961 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0); 2962 if (nlh == NULL) 2963 return -EMSGSIZE; 2964 2965 upe = nlmsg_data(nlh); 2966 copy_to_user_policy(xp, &upe->pol, dir); 2967 err = copy_to_user_tmpl(xp, skb); 2968 if (!err) 2969 err = copy_to_user_sec_ctx(xp, skb); 2970 if (!err) 2971 err = copy_to_user_policy_type(xp->type, skb); 2972 if (!err) 2973 err = xfrm_mark_put(skb, &xp->mark); 2974 if (err) { 2975 nlmsg_cancel(skb, nlh); 2976 return err; 2977 } 2978 upe->hard = !!hard; 2979 2980 nlmsg_end(skb, nlh); 2981 return 0; 2982 } 2983 2984 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 2985 { 2986 struct net *net = xp_net(xp); 2987 struct sk_buff *skb; 2988 int err; 2989 2990 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC); 2991 if (skb == NULL) 2992 return -ENOMEM; 2993 2994 err = build_polexpire(skb, xp, dir, c); 2995 BUG_ON(err < 0); 2996 2997 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE); 2998 } 2999 3000 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) 3001 { 3002 unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); 3003 struct net *net = xp_net(xp); 3004 struct xfrm_userpolicy_info *p; 3005 struct xfrm_userpolicy_id *id; 3006 struct nlmsghdr *nlh; 3007 struct sk_buff *skb; 3008 unsigned int headlen; 3009 int err; 3010 3011 headlen = sizeof(*p); 3012 if (c->event == XFRM_MSG_DELPOLICY) { 3013 len += nla_total_size(headlen); 3014 headlen = sizeof(*id); 3015 } 3016 len += userpolicy_type_attrsize(); 3017 len += nla_total_size(sizeof(struct xfrm_mark)); 3018 len += NLMSG_ALIGN(headlen); 3019 3020 skb = nlmsg_new(len, GFP_ATOMIC); 3021 if (skb == NULL) 3022 return -ENOMEM; 3023 3024 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); 3025 err = -EMSGSIZE; 3026 if (nlh == NULL) 3027 goto out_free_skb; 3028 3029 p = nlmsg_data(nlh); 3030 if (c->event == XFRM_MSG_DELPOLICY) { 3031 struct nlattr *attr; 3032 3033 id = nlmsg_data(nlh); 3034 memset(id, 0, sizeof(*id)); 3035 id->dir = dir; 3036 if (c->data.byid) 3037 id->index = xp->index; 3038 else 3039 memcpy(&id->sel, &xp->selector, sizeof(id->sel)); 3040 3041 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p)); 3042 err = -EMSGSIZE; 3043 if (attr == NULL) 3044 goto out_free_skb; 3045 3046 p = nla_data(attr); 3047 } 3048 3049 copy_to_user_policy(xp, p, dir); 3050 err = copy_to_user_tmpl(xp, skb); 3051 if (!err) 3052 err = copy_to_user_policy_type(xp->type, skb); 3053 if (!err) 3054 err = xfrm_mark_put(skb, &xp->mark); 3055 if (err) 3056 goto out_free_skb; 3057 3058 nlmsg_end(skb, nlh); 3059 3060 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 3061 3062 out_free_skb: 3063 kfree_skb(skb); 3064 return err; 3065 } 3066 3067 static int xfrm_notify_policy_flush(const struct km_event *c) 3068 { 3069 struct net *net = c->net; 3070 struct nlmsghdr *nlh; 3071 struct sk_buff *skb; 3072 int err; 3073 3074 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC); 3075 if (skb == NULL) 3076 return -ENOMEM; 3077 3078 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0); 3079 err = -EMSGSIZE; 3080 if (nlh == NULL) 3081 goto out_free_skb; 3082 err = copy_to_user_policy_type(c->data.type, skb); 3083 if (err) 3084 goto out_free_skb; 3085 3086 nlmsg_end(skb, nlh); 3087 3088 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 3089 3090 out_free_skb: 3091 kfree_skb(skb); 3092 return err; 3093 } 3094 3095 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 3096 { 3097 3098 switch (c->event) { 3099 case XFRM_MSG_NEWPOLICY: 3100 case XFRM_MSG_UPDPOLICY: 3101 case XFRM_MSG_DELPOLICY: 3102 return xfrm_notify_policy(xp, dir, c); 3103 case XFRM_MSG_FLUSHPOLICY: 3104 return xfrm_notify_policy_flush(c); 3105 case XFRM_MSG_POLEXPIRE: 3106 return xfrm_exp_policy_notify(xp, dir, c); 3107 default: 3108 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n", 3109 c->event); 3110 } 3111 3112 return 0; 3113 3114 } 3115 3116 static inline unsigned int xfrm_report_msgsize(void) 3117 { 3118 return NLMSG_ALIGN(sizeof(struct xfrm_user_report)); 3119 } 3120 3121 static int build_report(struct sk_buff *skb, u8 proto, 3122 struct xfrm_selector *sel, xfrm_address_t *addr) 3123 { 3124 struct xfrm_user_report *ur; 3125 struct nlmsghdr *nlh; 3126 3127 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0); 3128 if (nlh == NULL) 3129 return -EMSGSIZE; 3130 3131 ur = nlmsg_data(nlh); 3132 ur->proto = proto; 3133 memcpy(&ur->sel, sel, sizeof(ur->sel)); 3134 3135 if (addr) { 3136 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr); 3137 if (err) { 3138 nlmsg_cancel(skb, nlh); 3139 return err; 3140 } 3141 } 3142 nlmsg_end(skb, nlh); 3143 return 0; 3144 } 3145 3146 static int xfrm_send_report(struct net *net, u8 proto, 3147 struct xfrm_selector *sel, xfrm_address_t *addr) 3148 { 3149 struct sk_buff *skb; 3150 int err; 3151 3152 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC); 3153 if (skb == NULL) 3154 return -ENOMEM; 3155 3156 err = build_report(skb, proto, sel, addr); 3157 BUG_ON(err < 0); 3158 3159 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT); 3160 } 3161 3162 static inline unsigned int xfrm_mapping_msgsize(void) 3163 { 3164 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping)); 3165 } 3166 3167 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x, 3168 xfrm_address_t *new_saddr, __be16 new_sport) 3169 { 3170 struct xfrm_user_mapping *um; 3171 struct nlmsghdr *nlh; 3172 3173 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0); 3174 if (nlh == NULL) 3175 return -EMSGSIZE; 3176 3177 um = nlmsg_data(nlh); 3178 3179 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr)); 3180 um->id.spi = x->id.spi; 3181 um->id.family = x->props.family; 3182 um->id.proto = x->id.proto; 3183 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr)); 3184 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr)); 3185 um->new_sport = new_sport; 3186 um->old_sport = x->encap->encap_sport; 3187 um->reqid = x->props.reqid; 3188 3189 nlmsg_end(skb, nlh); 3190 return 0; 3191 } 3192 3193 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, 3194 __be16 sport) 3195 { 3196 struct net *net = xs_net(x); 3197 struct sk_buff *skb; 3198 int err; 3199 3200 if (x->id.proto != IPPROTO_ESP) 3201 return -EINVAL; 3202 3203 if (!x->encap) 3204 return -EINVAL; 3205 3206 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC); 3207 if (skb == NULL) 3208 return -ENOMEM; 3209 3210 err = build_mapping(skb, x, ipaddr, sport); 3211 BUG_ON(err < 0); 3212 3213 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING); 3214 } 3215 3216 static bool xfrm_is_alive(const struct km_event *c) 3217 { 3218 return (bool)xfrm_acquire_is_on(c->net); 3219 } 3220 3221 static struct xfrm_mgr netlink_mgr = { 3222 .notify = xfrm_send_state_notify, 3223 .acquire = xfrm_send_acquire, 3224 .compile_policy = xfrm_compile_policy, 3225 .notify_policy = xfrm_send_policy_notify, 3226 .report = xfrm_send_report, 3227 .migrate = xfrm_send_migrate, 3228 .new_mapping = xfrm_send_mapping, 3229 .is_alive = xfrm_is_alive, 3230 }; 3231 3232 static int __net_init xfrm_user_net_init(struct net *net) 3233 { 3234 struct sock *nlsk; 3235 struct netlink_kernel_cfg cfg = { 3236 .groups = XFRMNLGRP_MAX, 3237 .input = xfrm_netlink_rcv, 3238 }; 3239 3240 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg); 3241 if (nlsk == NULL) 3242 return -ENOMEM; 3243 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */ 3244 rcu_assign_pointer(net->xfrm.nlsk, nlsk); 3245 return 0; 3246 } 3247 3248 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list) 3249 { 3250 struct net *net; 3251 list_for_each_entry(net, net_exit_list, exit_list) 3252 RCU_INIT_POINTER(net->xfrm.nlsk, NULL); 3253 synchronize_net(); 3254 list_for_each_entry(net, net_exit_list, exit_list) 3255 netlink_kernel_release(net->xfrm.nlsk_stash); 3256 } 3257 3258 static struct pernet_operations xfrm_user_net_ops = { 3259 .init = xfrm_user_net_init, 3260 .exit_batch = xfrm_user_net_exit, 3261 }; 3262 3263 static int __init xfrm_user_init(void) 3264 { 3265 int rv; 3266 3267 printk(KERN_INFO "Initializing XFRM netlink socket\n"); 3268 3269 rv = register_pernet_subsys(&xfrm_user_net_ops); 3270 if (rv < 0) 3271 return rv; 3272 rv = xfrm_register_km(&netlink_mgr); 3273 if (rv < 0) 3274 unregister_pernet_subsys(&xfrm_user_net_ops); 3275 return rv; 3276 } 3277 3278 static void __exit xfrm_user_exit(void) 3279 { 3280 xfrm_unregister_km(&netlink_mgr); 3281 unregister_pernet_subsys(&xfrm_user_net_ops); 3282 } 3283 3284 module_init(xfrm_user_init); 3285 module_exit(xfrm_user_exit); 3286 MODULE_LICENSE("GPL"); 3287 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM); 3288 3289