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