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