1 /* xfrm_user.c: User interface to configure xfrm engine. 2 * 3 * Copyright (C) 2002 David S. Miller (davem@redhat.com) 4 * 5 * Changes: 6 * Mitsuru KANDA @USAGI 7 * Kazunori MIYAZAWA @USAGI 8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com> 9 * IPv6 support 10 * 11 */ 12 13 #include <linux/crypto.h> 14 #include <linux/module.h> 15 #include <linux/kernel.h> 16 #include <linux/types.h> 17 #include <linux/slab.h> 18 #include <linux/socket.h> 19 #include <linux/string.h> 20 #include <linux/net.h> 21 #include <linux/skbuff.h> 22 #include <linux/pfkeyv2.h> 23 #include <linux/ipsec.h> 24 #include <linux/init.h> 25 #include <linux/security.h> 26 #include <net/sock.h> 27 #include <net/xfrm.h> 28 #include <net/netlink.h> 29 #include <net/ah.h> 30 #include <linux/uaccess.h> 31 #if IS_ENABLED(CONFIG_IPV6) 32 #include <linux/in6.h> 33 #endif 34 #include <asm/unaligned.h> 35 36 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type) 37 { 38 struct nlattr *rt = attrs[type]; 39 struct xfrm_algo *algp; 40 41 if (!rt) 42 return 0; 43 44 algp = nla_data(rt); 45 if (nla_len(rt) < (int)xfrm_alg_len(algp)) 46 return -EINVAL; 47 48 switch (type) { 49 case XFRMA_ALG_AUTH: 50 case XFRMA_ALG_CRYPT: 51 case XFRMA_ALG_COMP: 52 break; 53 54 default: 55 return -EINVAL; 56 } 57 58 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0'; 59 return 0; 60 } 61 62 static int verify_auth_trunc(struct nlattr **attrs) 63 { 64 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC]; 65 struct xfrm_algo_auth *algp; 66 67 if (!rt) 68 return 0; 69 70 algp = nla_data(rt); 71 if (nla_len(rt) < (int)xfrm_alg_auth_len(algp)) 72 return -EINVAL; 73 74 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0'; 75 return 0; 76 } 77 78 static int verify_aead(struct nlattr **attrs) 79 { 80 struct nlattr *rt = attrs[XFRMA_ALG_AEAD]; 81 struct xfrm_algo_aead *algp; 82 83 if (!rt) 84 return 0; 85 86 algp = nla_data(rt); 87 if (nla_len(rt) < (int)aead_len(algp)) 88 return -EINVAL; 89 90 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0'; 91 return 0; 92 } 93 94 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type, 95 xfrm_address_t **addrp) 96 { 97 struct nlattr *rt = attrs[type]; 98 99 if (rt && addrp) 100 *addrp = nla_data(rt); 101 } 102 103 static inline int verify_sec_ctx_len(struct nlattr **attrs) 104 { 105 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 106 struct xfrm_user_sec_ctx *uctx; 107 108 if (!rt) 109 return 0; 110 111 uctx = nla_data(rt); 112 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len)) 113 return -EINVAL; 114 115 return 0; 116 } 117 118 static inline int verify_replay(struct xfrm_usersa_info *p, 119 struct nlattr **attrs) 120 { 121 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL]; 122 struct xfrm_replay_state_esn *rs; 123 124 if (p->flags & XFRM_STATE_ESN) { 125 if (!rt) 126 return -EINVAL; 127 128 rs = nla_data(rt); 129 130 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8) 131 return -EINVAL; 132 133 if (nla_len(rt) < (int)xfrm_replay_state_esn_len(rs) && 134 nla_len(rt) != sizeof(*rs)) 135 return -EINVAL; 136 } 137 138 if (!rt) 139 return 0; 140 141 /* As only ESP and AH support ESN feature. */ 142 if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH)) 143 return -EINVAL; 144 145 if (p->replay_window != 0) 146 return -EINVAL; 147 148 return 0; 149 } 150 151 static int verify_newsa_info(struct xfrm_usersa_info *p, 152 struct nlattr **attrs) 153 { 154 int err; 155 156 err = -EINVAL; 157 switch (p->family) { 158 case AF_INET: 159 break; 160 161 case AF_INET6: 162 #if IS_ENABLED(CONFIG_IPV6) 163 break; 164 #else 165 err = -EAFNOSUPPORT; 166 goto out; 167 #endif 168 169 default: 170 goto out; 171 } 172 173 err = -EINVAL; 174 switch (p->id.proto) { 175 case IPPROTO_AH: 176 if ((!attrs[XFRMA_ALG_AUTH] && 177 !attrs[XFRMA_ALG_AUTH_TRUNC]) || 178 attrs[XFRMA_ALG_AEAD] || 179 attrs[XFRMA_ALG_CRYPT] || 180 attrs[XFRMA_ALG_COMP] || 181 attrs[XFRMA_TFCPAD]) 182 goto out; 183 break; 184 185 case IPPROTO_ESP: 186 if (attrs[XFRMA_ALG_COMP]) 187 goto out; 188 if (!attrs[XFRMA_ALG_AUTH] && 189 !attrs[XFRMA_ALG_AUTH_TRUNC] && 190 !attrs[XFRMA_ALG_CRYPT] && 191 !attrs[XFRMA_ALG_AEAD]) 192 goto out; 193 if ((attrs[XFRMA_ALG_AUTH] || 194 attrs[XFRMA_ALG_AUTH_TRUNC] || 195 attrs[XFRMA_ALG_CRYPT]) && 196 attrs[XFRMA_ALG_AEAD]) 197 goto out; 198 if (attrs[XFRMA_TFCPAD] && 199 p->mode != XFRM_MODE_TUNNEL) 200 goto out; 201 break; 202 203 case IPPROTO_COMP: 204 if (!attrs[XFRMA_ALG_COMP] || 205 attrs[XFRMA_ALG_AEAD] || 206 attrs[XFRMA_ALG_AUTH] || 207 attrs[XFRMA_ALG_AUTH_TRUNC] || 208 attrs[XFRMA_ALG_CRYPT] || 209 attrs[XFRMA_TFCPAD] || 210 (ntohl(p->id.spi) >= 0x10000)) 211 goto out; 212 break; 213 214 #if IS_ENABLED(CONFIG_IPV6) 215 case IPPROTO_DSTOPTS: 216 case IPPROTO_ROUTING: 217 if (attrs[XFRMA_ALG_COMP] || 218 attrs[XFRMA_ALG_AUTH] || 219 attrs[XFRMA_ALG_AUTH_TRUNC] || 220 attrs[XFRMA_ALG_AEAD] || 221 attrs[XFRMA_ALG_CRYPT] || 222 attrs[XFRMA_ENCAP] || 223 attrs[XFRMA_SEC_CTX] || 224 attrs[XFRMA_TFCPAD] || 225 !attrs[XFRMA_COADDR]) 226 goto out; 227 break; 228 #endif 229 230 default: 231 goto out; 232 } 233 234 if ((err = verify_aead(attrs))) 235 goto out; 236 if ((err = verify_auth_trunc(attrs))) 237 goto out; 238 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH))) 239 goto out; 240 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT))) 241 goto out; 242 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP))) 243 goto out; 244 if ((err = verify_sec_ctx_len(attrs))) 245 goto out; 246 if ((err = verify_replay(p, attrs))) 247 goto out; 248 249 err = -EINVAL; 250 switch (p->mode) { 251 case XFRM_MODE_TRANSPORT: 252 case XFRM_MODE_TUNNEL: 253 case XFRM_MODE_ROUTEOPTIMIZATION: 254 case XFRM_MODE_BEET: 255 break; 256 257 default: 258 goto out; 259 } 260 261 err = 0; 262 263 out: 264 return err; 265 } 266 267 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props, 268 struct xfrm_algo_desc *(*get_byname)(const char *, int), 269 struct nlattr *rta) 270 { 271 struct xfrm_algo *p, *ualg; 272 struct xfrm_algo_desc *algo; 273 274 if (!rta) 275 return 0; 276 277 ualg = nla_data(rta); 278 279 algo = get_byname(ualg->alg_name, 1); 280 if (!algo) 281 return -ENOSYS; 282 *props = algo->desc.sadb_alg_id; 283 284 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL); 285 if (!p) 286 return -ENOMEM; 287 288 strcpy(p->alg_name, algo->name); 289 *algpp = p; 290 return 0; 291 } 292 293 static int attach_crypt(struct xfrm_state *x, struct nlattr *rta) 294 { 295 struct xfrm_algo *p, *ualg; 296 struct xfrm_algo_desc *algo; 297 298 if (!rta) 299 return 0; 300 301 ualg = nla_data(rta); 302 303 algo = xfrm_ealg_get_byname(ualg->alg_name, 1); 304 if (!algo) 305 return -ENOSYS; 306 x->props.ealgo = algo->desc.sadb_alg_id; 307 308 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL); 309 if (!p) 310 return -ENOMEM; 311 312 strcpy(p->alg_name, algo->name); 313 x->ealg = p; 314 x->geniv = algo->uinfo.encr.geniv; 315 return 0; 316 } 317 318 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props, 319 struct nlattr *rta) 320 { 321 struct xfrm_algo *ualg; 322 struct xfrm_algo_auth *p; 323 struct xfrm_algo_desc *algo; 324 325 if (!rta) 326 return 0; 327 328 ualg = nla_data(rta); 329 330 algo = xfrm_aalg_get_byname(ualg->alg_name, 1); 331 if (!algo) 332 return -ENOSYS; 333 *props = algo->desc.sadb_alg_id; 334 335 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL); 336 if (!p) 337 return -ENOMEM; 338 339 strcpy(p->alg_name, algo->name); 340 p->alg_key_len = ualg->alg_key_len; 341 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; 342 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8); 343 344 *algpp = p; 345 return 0; 346 } 347 348 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props, 349 struct nlattr *rta) 350 { 351 struct xfrm_algo_auth *p, *ualg; 352 struct xfrm_algo_desc *algo; 353 354 if (!rta) 355 return 0; 356 357 ualg = nla_data(rta); 358 359 algo = xfrm_aalg_get_byname(ualg->alg_name, 1); 360 if (!algo) 361 return -ENOSYS; 362 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits) 363 return -EINVAL; 364 *props = algo->desc.sadb_alg_id; 365 366 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL); 367 if (!p) 368 return -ENOMEM; 369 370 strcpy(p->alg_name, algo->name); 371 if (!p->alg_trunc_len) 372 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; 373 374 *algpp = p; 375 return 0; 376 } 377 378 static int attach_aead(struct xfrm_state *x, struct nlattr *rta) 379 { 380 struct xfrm_algo_aead *p, *ualg; 381 struct xfrm_algo_desc *algo; 382 383 if (!rta) 384 return 0; 385 386 ualg = nla_data(rta); 387 388 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1); 389 if (!algo) 390 return -ENOSYS; 391 x->props.ealgo = algo->desc.sadb_alg_id; 392 393 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL); 394 if (!p) 395 return -ENOMEM; 396 397 strcpy(p->alg_name, algo->name); 398 x->aead = p; 399 x->geniv = algo->uinfo.aead.geniv; 400 return 0; 401 } 402 403 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn, 404 struct nlattr *rp) 405 { 406 struct xfrm_replay_state_esn *up; 407 unsigned int ulen; 408 409 if (!replay_esn || !rp) 410 return 0; 411 412 up = nla_data(rp); 413 ulen = xfrm_replay_state_esn_len(up); 414 415 /* Check the overall length and the internal bitmap length to avoid 416 * potential overflow. */ 417 if (nla_len(rp) < (int)ulen || 418 xfrm_replay_state_esn_len(replay_esn) != ulen || 419 replay_esn->bmp_len != up->bmp_len) 420 return -EINVAL; 421 422 if (up->replay_window > up->bmp_len * sizeof(__u32) * 8) 423 return -EINVAL; 424 425 return 0; 426 } 427 428 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn, 429 struct xfrm_replay_state_esn **preplay_esn, 430 struct nlattr *rta) 431 { 432 struct xfrm_replay_state_esn *p, *pp, *up; 433 unsigned int klen, ulen; 434 435 if (!rta) 436 return 0; 437 438 up = nla_data(rta); 439 klen = xfrm_replay_state_esn_len(up); 440 ulen = nla_len(rta) >= (int)klen ? klen : sizeof(*up); 441 442 p = kzalloc(klen, GFP_KERNEL); 443 if (!p) 444 return -ENOMEM; 445 446 pp = kzalloc(klen, GFP_KERNEL); 447 if (!pp) { 448 kfree(p); 449 return -ENOMEM; 450 } 451 452 memcpy(p, up, ulen); 453 memcpy(pp, up, ulen); 454 455 *replay_esn = p; 456 *preplay_esn = pp; 457 458 return 0; 459 } 460 461 static inline unsigned int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx) 462 { 463 unsigned int len = 0; 464 465 if (xfrm_ctx) { 466 len += sizeof(struct xfrm_user_sec_ctx); 467 len += xfrm_ctx->ctx_len; 468 } 469 return len; 470 } 471 472 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 473 { 474 memcpy(&x->id, &p->id, sizeof(x->id)); 475 memcpy(&x->sel, &p->sel, sizeof(x->sel)); 476 memcpy(&x->lft, &p->lft, sizeof(x->lft)); 477 x->props.mode = p->mode; 478 x->props.replay_window = min_t(unsigned int, p->replay_window, 479 sizeof(x->replay.bitmap) * 8); 480 x->props.reqid = p->reqid; 481 x->props.family = p->family; 482 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr)); 483 x->props.flags = p->flags; 484 485 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC)) 486 x->sel.family = p->family; 487 } 488 489 /* 490 * someday when pfkey also has support, we could have the code 491 * somehow made shareable and move it to xfrm_state.c - JHS 492 * 493 */ 494 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs, 495 int update_esn) 496 { 497 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 498 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL; 499 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 500 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; 501 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; 502 503 if (re) { 504 struct xfrm_replay_state_esn *replay_esn; 505 replay_esn = nla_data(re); 506 memcpy(x->replay_esn, replay_esn, 507 xfrm_replay_state_esn_len(replay_esn)); 508 memcpy(x->preplay_esn, replay_esn, 509 xfrm_replay_state_esn_len(replay_esn)); 510 } 511 512 if (rp) { 513 struct xfrm_replay_state *replay; 514 replay = nla_data(rp); 515 memcpy(&x->replay, replay, sizeof(*replay)); 516 memcpy(&x->preplay, replay, sizeof(*replay)); 517 } 518 519 if (lt) { 520 struct xfrm_lifetime_cur *ltime; 521 ltime = nla_data(lt); 522 x->curlft.bytes = ltime->bytes; 523 x->curlft.packets = ltime->packets; 524 x->curlft.add_time = ltime->add_time; 525 x->curlft.use_time = ltime->use_time; 526 } 527 528 if (et) 529 x->replay_maxage = nla_get_u32(et); 530 531 if (rt) 532 x->replay_maxdiff = nla_get_u32(rt); 533 } 534 535 static struct xfrm_state *xfrm_state_construct(struct net *net, 536 struct xfrm_usersa_info *p, 537 struct nlattr **attrs, 538 int *errp) 539 { 540 struct xfrm_state *x = xfrm_state_alloc(net); 541 int err = -ENOMEM; 542 543 if (!x) 544 goto error_no_put; 545 546 copy_from_user_state(x, p); 547 548 if (attrs[XFRMA_SA_EXTRA_FLAGS]) 549 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]); 550 551 if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD]))) 552 goto error; 553 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo, 554 attrs[XFRMA_ALG_AUTH_TRUNC]))) 555 goto error; 556 if (!x->props.aalgo) { 557 if ((err = attach_auth(&x->aalg, &x->props.aalgo, 558 attrs[XFRMA_ALG_AUTH]))) 559 goto error; 560 } 561 if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT]))) 562 goto error; 563 if ((err = attach_one_algo(&x->calg, &x->props.calgo, 564 xfrm_calg_get_byname, 565 attrs[XFRMA_ALG_COMP]))) 566 goto error; 567 568 if (attrs[XFRMA_ENCAP]) { 569 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]), 570 sizeof(*x->encap), GFP_KERNEL); 571 if (x->encap == NULL) 572 goto error; 573 } 574 575 if (attrs[XFRMA_TFCPAD]) 576 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]); 577 578 if (attrs[XFRMA_COADDR]) { 579 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]), 580 sizeof(*x->coaddr), GFP_KERNEL); 581 if (x->coaddr == NULL) 582 goto error; 583 } 584 585 xfrm_mark_get(attrs, &x->mark); 586 587 if (attrs[XFRMA_OUTPUT_MARK]) 588 x->props.output_mark = nla_get_u32(attrs[XFRMA_OUTPUT_MARK]); 589 590 err = __xfrm_init_state(x, false, attrs[XFRMA_OFFLOAD_DEV]); 591 if (err) 592 goto error; 593 594 if (attrs[XFRMA_SEC_CTX]) { 595 err = security_xfrm_state_alloc(x, 596 nla_data(attrs[XFRMA_SEC_CTX])); 597 if (err) 598 goto error; 599 } 600 601 if (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_dev_state_delete(x); 661 __xfrm_state_put(x); 662 goto out; 663 } 664 665 c.seq = nlh->nlmsg_seq; 666 c.portid = nlh->nlmsg_pid; 667 c.event = nlh->nlmsg_type; 668 669 km_state_notify(x, &c); 670 out: 671 xfrm_state_put(x); 672 return err; 673 } 674 675 static struct xfrm_state *xfrm_user_state_lookup(struct net *net, 676 struct xfrm_usersa_id *p, 677 struct nlattr **attrs, 678 int *errp) 679 { 680 struct xfrm_state *x = NULL; 681 struct xfrm_mark m; 682 int err; 683 u32 mark = xfrm_mark_get(attrs, &m); 684 685 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) { 686 err = -ESRCH; 687 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family); 688 } else { 689 xfrm_address_t *saddr = NULL; 690 691 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr); 692 if (!saddr) { 693 err = -EINVAL; 694 goto out; 695 } 696 697 err = -ESRCH; 698 x = xfrm_state_lookup_byaddr(net, mark, 699 &p->daddr, saddr, 700 p->proto, p->family); 701 } 702 703 out: 704 if (!x && errp) 705 *errp = err; 706 return x; 707 } 708 709 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 710 struct nlattr **attrs) 711 { 712 struct net *net = sock_net(skb->sk); 713 struct xfrm_state *x; 714 int err = -ESRCH; 715 struct km_event c; 716 struct xfrm_usersa_id *p = nlmsg_data(nlh); 717 718 x = xfrm_user_state_lookup(net, p, attrs, &err); 719 if (x == NULL) 720 return err; 721 722 if ((err = security_xfrm_state_delete(x)) != 0) 723 goto out; 724 725 if (xfrm_state_kern(x)) { 726 err = -EPERM; 727 goto out; 728 } 729 730 err = xfrm_state_delete(x); 731 732 if (err < 0) 733 goto out; 734 735 c.seq = nlh->nlmsg_seq; 736 c.portid = nlh->nlmsg_pid; 737 c.event = nlh->nlmsg_type; 738 km_state_notify(x, &c); 739 740 out: 741 xfrm_audit_state_delete(x, err ? 0 : 1, true); 742 xfrm_state_put(x); 743 return err; 744 } 745 746 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 747 { 748 memset(p, 0, sizeof(*p)); 749 memcpy(&p->id, &x->id, sizeof(p->id)); 750 memcpy(&p->sel, &x->sel, sizeof(p->sel)); 751 memcpy(&p->lft, &x->lft, sizeof(p->lft)); 752 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft)); 753 put_unaligned(x->stats.replay_window, &p->stats.replay_window); 754 put_unaligned(x->stats.replay, &p->stats.replay); 755 put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed); 756 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr)); 757 p->mode = x->props.mode; 758 p->replay_window = x->props.replay_window; 759 p->reqid = x->props.reqid; 760 p->family = x->props.family; 761 p->flags = x->props.flags; 762 p->seq = x->km.seq; 763 } 764 765 struct xfrm_dump_info { 766 struct sk_buff *in_skb; 767 struct sk_buff *out_skb; 768 u32 nlmsg_seq; 769 u16 nlmsg_flags; 770 }; 771 772 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb) 773 { 774 struct xfrm_user_sec_ctx *uctx; 775 struct nlattr *attr; 776 int ctx_size = sizeof(*uctx) + s->ctx_len; 777 778 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size); 779 if (attr == NULL) 780 return -EMSGSIZE; 781 782 uctx = nla_data(attr); 783 uctx->exttype = XFRMA_SEC_CTX; 784 uctx->len = ctx_size; 785 uctx->ctx_doi = s->ctx_doi; 786 uctx->ctx_alg = s->ctx_alg; 787 uctx->ctx_len = s->ctx_len; 788 memcpy(uctx + 1, s->ctx_str, s->ctx_len); 789 790 return 0; 791 } 792 793 static int copy_user_offload(struct xfrm_state_offload *xso, struct sk_buff *skb) 794 { 795 struct xfrm_user_offload *xuo; 796 struct nlattr *attr; 797 798 attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo)); 799 if (attr == NULL) 800 return -EMSGSIZE; 801 802 xuo = nla_data(attr); 803 memset(xuo, 0, sizeof(*xuo)); 804 xuo->ifindex = xso->dev->ifindex; 805 xuo->flags = xso->flags; 806 807 return 0; 808 } 809 810 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb) 811 { 812 struct xfrm_algo *algo; 813 struct nlattr *nla; 814 815 nla = nla_reserve(skb, XFRMA_ALG_AUTH, 816 sizeof(*algo) + (auth->alg_key_len + 7) / 8); 817 if (!nla) 818 return -EMSGSIZE; 819 820 algo = nla_data(nla); 821 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name)); 822 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8); 823 algo->alg_key_len = auth->alg_key_len; 824 825 return 0; 826 } 827 828 /* Don't change this without updating xfrm_sa_len! */ 829 static int copy_to_user_state_extra(struct xfrm_state *x, 830 struct xfrm_usersa_info *p, 831 struct sk_buff *skb) 832 { 833 int ret = 0; 834 835 copy_to_user_state(x, p); 836 837 if (x->props.extra_flags) { 838 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS, 839 x->props.extra_flags); 840 if (ret) 841 goto out; 842 } 843 844 if (x->coaddr) { 845 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr); 846 if (ret) 847 goto out; 848 } 849 if (x->lastused) { 850 ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused, 851 XFRMA_PAD); 852 if (ret) 853 goto out; 854 } 855 if (x->aead) { 856 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead); 857 if (ret) 858 goto out; 859 } 860 if (x->aalg) { 861 ret = copy_to_user_auth(x->aalg, skb); 862 if (!ret) 863 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC, 864 xfrm_alg_auth_len(x->aalg), x->aalg); 865 if (ret) 866 goto out; 867 } 868 if (x->ealg) { 869 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg); 870 if (ret) 871 goto out; 872 } 873 if (x->calg) { 874 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg); 875 if (ret) 876 goto out; 877 } 878 if (x->encap) { 879 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap); 880 if (ret) 881 goto out; 882 } 883 if (x->tfcpad) { 884 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad); 885 if (ret) 886 goto out; 887 } 888 ret = xfrm_mark_put(skb, &x->mark); 889 if (ret) 890 goto out; 891 if (x->replay_esn) 892 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL, 893 xfrm_replay_state_esn_len(x->replay_esn), 894 x->replay_esn); 895 else 896 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), 897 &x->replay); 898 if (ret) 899 goto out; 900 if(x->xso.dev) 901 ret = copy_user_offload(&x->xso, skb); 902 if (ret) 903 goto out; 904 if (x->props.output_mark) { 905 ret = nla_put_u32(skb, XFRMA_OUTPUT_MARK, x->props.output_mark); 906 if (ret) 907 goto out; 908 } 909 if (x->security) 910 ret = copy_sec_ctx(x->security, skb); 911 out: 912 return ret; 913 } 914 915 static int dump_one_state(struct xfrm_state *x, int count, void *ptr) 916 { 917 struct xfrm_dump_info *sp = ptr; 918 struct sk_buff *in_skb = sp->in_skb; 919 struct sk_buff *skb = sp->out_skb; 920 struct xfrm_usersa_info *p; 921 struct nlmsghdr *nlh; 922 int err; 923 924 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, 925 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags); 926 if (nlh == NULL) 927 return -EMSGSIZE; 928 929 p = nlmsg_data(nlh); 930 931 err = copy_to_user_state_extra(x, p, skb); 932 if (err) { 933 nlmsg_cancel(skb, nlh); 934 return err; 935 } 936 nlmsg_end(skb, nlh); 937 return 0; 938 } 939 940 static int xfrm_dump_sa_done(struct netlink_callback *cb) 941 { 942 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 943 struct sock *sk = cb->skb->sk; 944 struct net *net = sock_net(sk); 945 946 if (cb->args[0]) 947 xfrm_state_walk_done(walk, net); 948 return 0; 949 } 950 951 static const struct nla_policy xfrma_policy[XFRMA_MAX+1]; 952 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb) 953 { 954 struct net *net = sock_net(skb->sk); 955 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 956 struct xfrm_dump_info info; 957 958 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) > 959 sizeof(cb->args) - sizeof(cb->args[0])); 960 961 info.in_skb = cb->skb; 962 info.out_skb = skb; 963 info.nlmsg_seq = cb->nlh->nlmsg_seq; 964 info.nlmsg_flags = NLM_F_MULTI; 965 966 if (!cb->args[0]) { 967 struct nlattr *attrs[XFRMA_MAX+1]; 968 struct xfrm_address_filter *filter = NULL; 969 u8 proto = 0; 970 int err; 971 972 err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX, xfrma_policy, 973 NULL); 974 if (err < 0) 975 return err; 976 977 if (attrs[XFRMA_ADDRESS_FILTER]) { 978 filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]), 979 sizeof(*filter), GFP_KERNEL); 980 if (filter == NULL) 981 return -ENOMEM; 982 } 983 984 if (attrs[XFRMA_PROTO]) 985 proto = nla_get_u8(attrs[XFRMA_PROTO]); 986 987 xfrm_state_walk_init(walk, proto, filter); 988 cb->args[0] = 1; 989 } 990 991 (void) xfrm_state_walk(net, walk, dump_one_state, &info); 992 993 return skb->len; 994 } 995 996 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb, 997 struct xfrm_state *x, u32 seq) 998 { 999 struct xfrm_dump_info info; 1000 struct sk_buff *skb; 1001 int err; 1002 1003 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1004 if (!skb) 1005 return ERR_PTR(-ENOMEM); 1006 1007 info.in_skb = in_skb; 1008 info.out_skb = skb; 1009 info.nlmsg_seq = seq; 1010 info.nlmsg_flags = 0; 1011 1012 err = dump_one_state(x, 0, &info); 1013 if (err) { 1014 kfree_skb(skb); 1015 return ERR_PTR(err); 1016 } 1017 1018 return skb; 1019 } 1020 1021 /* A wrapper for nlmsg_multicast() checking that nlsk is still available. 1022 * Must be called with RCU read lock. 1023 */ 1024 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb, 1025 u32 pid, unsigned int group) 1026 { 1027 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk); 1028 1029 if (nlsk) 1030 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC); 1031 else 1032 return -1; 1033 } 1034 1035 static inline unsigned int xfrm_spdinfo_msgsize(void) 1036 { 1037 return NLMSG_ALIGN(4) 1038 + nla_total_size(sizeof(struct xfrmu_spdinfo)) 1039 + nla_total_size(sizeof(struct xfrmu_spdhinfo)) 1040 + nla_total_size(sizeof(struct xfrmu_spdhthresh)) 1041 + nla_total_size(sizeof(struct xfrmu_spdhthresh)); 1042 } 1043 1044 static int build_spdinfo(struct sk_buff *skb, struct net *net, 1045 u32 portid, u32 seq, u32 flags) 1046 { 1047 struct xfrmk_spdinfo si; 1048 struct xfrmu_spdinfo spc; 1049 struct xfrmu_spdhinfo sph; 1050 struct xfrmu_spdhthresh spt4, spt6; 1051 struct nlmsghdr *nlh; 1052 int err; 1053 u32 *f; 1054 unsigned lseq; 1055 1056 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0); 1057 if (nlh == NULL) /* shouldn't really happen ... */ 1058 return -EMSGSIZE; 1059 1060 f = nlmsg_data(nlh); 1061 *f = flags; 1062 xfrm_spd_getinfo(net, &si); 1063 spc.incnt = si.incnt; 1064 spc.outcnt = si.outcnt; 1065 spc.fwdcnt = si.fwdcnt; 1066 spc.inscnt = si.inscnt; 1067 spc.outscnt = si.outscnt; 1068 spc.fwdscnt = si.fwdscnt; 1069 sph.spdhcnt = si.spdhcnt; 1070 sph.spdhmcnt = si.spdhmcnt; 1071 1072 do { 1073 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock); 1074 1075 spt4.lbits = net->xfrm.policy_hthresh.lbits4; 1076 spt4.rbits = net->xfrm.policy_hthresh.rbits4; 1077 spt6.lbits = net->xfrm.policy_hthresh.lbits6; 1078 spt6.rbits = net->xfrm.policy_hthresh.rbits6; 1079 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq)); 1080 1081 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc); 1082 if (!err) 1083 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph); 1084 if (!err) 1085 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4); 1086 if (!err) 1087 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6); 1088 if (err) { 1089 nlmsg_cancel(skb, nlh); 1090 return err; 1091 } 1092 1093 nlmsg_end(skb, nlh); 1094 return 0; 1095 } 1096 1097 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1098 struct nlattr **attrs) 1099 { 1100 struct net *net = sock_net(skb->sk); 1101 struct xfrmu_spdhthresh *thresh4 = NULL; 1102 struct xfrmu_spdhthresh *thresh6 = NULL; 1103 1104 /* selector prefixlen thresholds to hash policies */ 1105 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) { 1106 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH]; 1107 1108 if (nla_len(rta) < sizeof(*thresh4)) 1109 return -EINVAL; 1110 thresh4 = nla_data(rta); 1111 if (thresh4->lbits > 32 || thresh4->rbits > 32) 1112 return -EINVAL; 1113 } 1114 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) { 1115 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH]; 1116 1117 if (nla_len(rta) < sizeof(*thresh6)) 1118 return -EINVAL; 1119 thresh6 = nla_data(rta); 1120 if (thresh6->lbits > 128 || thresh6->rbits > 128) 1121 return -EINVAL; 1122 } 1123 1124 if (thresh4 || thresh6) { 1125 write_seqlock(&net->xfrm.policy_hthresh.lock); 1126 if (thresh4) { 1127 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits; 1128 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits; 1129 } 1130 if (thresh6) { 1131 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits; 1132 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits; 1133 } 1134 write_sequnlock(&net->xfrm.policy_hthresh.lock); 1135 1136 xfrm_policy_hash_rebuild(net); 1137 } 1138 1139 return 0; 1140 } 1141 1142 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1143 struct nlattr **attrs) 1144 { 1145 struct net *net = sock_net(skb->sk); 1146 struct sk_buff *r_skb; 1147 u32 *flags = nlmsg_data(nlh); 1148 u32 sportid = NETLINK_CB(skb).portid; 1149 u32 seq = nlh->nlmsg_seq; 1150 int err; 1151 1152 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC); 1153 if (r_skb == NULL) 1154 return -ENOMEM; 1155 1156 err = build_spdinfo(r_skb, net, sportid, seq, *flags); 1157 BUG_ON(err < 0); 1158 1159 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); 1160 } 1161 1162 static inline unsigned int xfrm_sadinfo_msgsize(void) 1163 { 1164 return NLMSG_ALIGN(4) 1165 + nla_total_size(sizeof(struct xfrmu_sadhinfo)) 1166 + nla_total_size(4); /* XFRMA_SAD_CNT */ 1167 } 1168 1169 static int build_sadinfo(struct sk_buff *skb, struct net *net, 1170 u32 portid, u32 seq, u32 flags) 1171 { 1172 struct xfrmk_sadinfo si; 1173 struct xfrmu_sadhinfo sh; 1174 struct nlmsghdr *nlh; 1175 int err; 1176 u32 *f; 1177 1178 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0); 1179 if (nlh == NULL) /* shouldn't really happen ... */ 1180 return -EMSGSIZE; 1181 1182 f = nlmsg_data(nlh); 1183 *f = flags; 1184 xfrm_sad_getinfo(net, &si); 1185 1186 sh.sadhmcnt = si.sadhmcnt; 1187 sh.sadhcnt = si.sadhcnt; 1188 1189 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt); 1190 if (!err) 1191 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh); 1192 if (err) { 1193 nlmsg_cancel(skb, nlh); 1194 return err; 1195 } 1196 1197 nlmsg_end(skb, nlh); 1198 return 0; 1199 } 1200 1201 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 1202 struct nlattr **attrs) 1203 { 1204 struct net *net = sock_net(skb->sk); 1205 struct sk_buff *r_skb; 1206 u32 *flags = nlmsg_data(nlh); 1207 u32 sportid = NETLINK_CB(skb).portid; 1208 u32 seq = nlh->nlmsg_seq; 1209 int err; 1210 1211 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC); 1212 if (r_skb == NULL) 1213 return -ENOMEM; 1214 1215 err = build_sadinfo(r_skb, net, sportid, seq, *flags); 1216 BUG_ON(err < 0); 1217 1218 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); 1219 } 1220 1221 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 1222 struct nlattr **attrs) 1223 { 1224 struct net *net = sock_net(skb->sk); 1225 struct xfrm_usersa_id *p = nlmsg_data(nlh); 1226 struct xfrm_state *x; 1227 struct sk_buff *resp_skb; 1228 int err = -ESRCH; 1229 1230 x = xfrm_user_state_lookup(net, p, attrs, &err); 1231 if (x == NULL) 1232 goto out_noput; 1233 1234 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 1235 if (IS_ERR(resp_skb)) { 1236 err = PTR_ERR(resp_skb); 1237 } else { 1238 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); 1239 } 1240 xfrm_state_put(x); 1241 out_noput: 1242 return err; 1243 } 1244 1245 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, 1246 struct nlattr **attrs) 1247 { 1248 struct net *net = sock_net(skb->sk); 1249 struct xfrm_state *x; 1250 struct xfrm_userspi_info *p; 1251 struct sk_buff *resp_skb; 1252 xfrm_address_t *daddr; 1253 int family; 1254 int err; 1255 u32 mark; 1256 struct xfrm_mark m; 1257 1258 p = nlmsg_data(nlh); 1259 err = verify_spi_info(p->info.id.proto, p->min, p->max); 1260 if (err) 1261 goto out_noput; 1262 1263 family = p->info.family; 1264 daddr = &p->info.id.daddr; 1265 1266 x = NULL; 1267 1268 mark = xfrm_mark_get(attrs, &m); 1269 if (p->info.seq) { 1270 x = xfrm_find_acq_byseq(net, mark, p->info.seq); 1271 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) { 1272 xfrm_state_put(x); 1273 x = NULL; 1274 } 1275 } 1276 1277 if (!x) 1278 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid, 1279 p->info.id.proto, daddr, 1280 &p->info.saddr, 1, 1281 family); 1282 err = -ENOENT; 1283 if (x == NULL) 1284 goto out_noput; 1285 1286 err = xfrm_alloc_spi(x, p->min, p->max); 1287 if (err) 1288 goto out; 1289 1290 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 1291 if (IS_ERR(resp_skb)) { 1292 err = PTR_ERR(resp_skb); 1293 goto out; 1294 } 1295 1296 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); 1297 1298 out: 1299 xfrm_state_put(x); 1300 out_noput: 1301 return err; 1302 } 1303 1304 static int verify_policy_dir(u8 dir) 1305 { 1306 switch (dir) { 1307 case XFRM_POLICY_IN: 1308 case XFRM_POLICY_OUT: 1309 case XFRM_POLICY_FWD: 1310 break; 1311 1312 default: 1313 return -EINVAL; 1314 } 1315 1316 return 0; 1317 } 1318 1319 static int verify_policy_type(u8 type) 1320 { 1321 switch (type) { 1322 case XFRM_POLICY_TYPE_MAIN: 1323 #ifdef CONFIG_XFRM_SUB_POLICY 1324 case XFRM_POLICY_TYPE_SUB: 1325 #endif 1326 break; 1327 1328 default: 1329 return -EINVAL; 1330 } 1331 1332 return 0; 1333 } 1334 1335 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p) 1336 { 1337 int ret; 1338 1339 switch (p->share) { 1340 case XFRM_SHARE_ANY: 1341 case XFRM_SHARE_SESSION: 1342 case XFRM_SHARE_USER: 1343 case XFRM_SHARE_UNIQUE: 1344 break; 1345 1346 default: 1347 return -EINVAL; 1348 } 1349 1350 switch (p->action) { 1351 case XFRM_POLICY_ALLOW: 1352 case XFRM_POLICY_BLOCK: 1353 break; 1354 1355 default: 1356 return -EINVAL; 1357 } 1358 1359 switch (p->sel.family) { 1360 case AF_INET: 1361 break; 1362 1363 case AF_INET6: 1364 #if IS_ENABLED(CONFIG_IPV6) 1365 break; 1366 #else 1367 return -EAFNOSUPPORT; 1368 #endif 1369 1370 default: 1371 return -EINVAL; 1372 } 1373 1374 ret = verify_policy_dir(p->dir); 1375 if (ret) 1376 return ret; 1377 if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir)) 1378 return -EINVAL; 1379 1380 return 0; 1381 } 1382 1383 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs) 1384 { 1385 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1386 struct xfrm_user_sec_ctx *uctx; 1387 1388 if (!rt) 1389 return 0; 1390 1391 uctx = nla_data(rt); 1392 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL); 1393 } 1394 1395 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut, 1396 int nr) 1397 { 1398 int i; 1399 1400 xp->xfrm_nr = nr; 1401 for (i = 0; i < nr; i++, ut++) { 1402 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 1403 1404 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id)); 1405 memcpy(&t->saddr, &ut->saddr, 1406 sizeof(xfrm_address_t)); 1407 t->reqid = ut->reqid; 1408 t->mode = ut->mode; 1409 t->share = ut->share; 1410 t->optional = ut->optional; 1411 t->aalgos = ut->aalgos; 1412 t->ealgos = ut->ealgos; 1413 t->calgos = ut->calgos; 1414 /* If all masks are ~0, then we allow all algorithms. */ 1415 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos); 1416 t->encap_family = ut->family; 1417 } 1418 } 1419 1420 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family) 1421 { 1422 int i; 1423 1424 if (nr > XFRM_MAX_DEPTH) 1425 return -EINVAL; 1426 1427 for (i = 0; i < nr; i++) { 1428 /* We never validated the ut->family value, so many 1429 * applications simply leave it at zero. The check was 1430 * never made and ut->family was ignored because all 1431 * templates could be assumed to have the same family as 1432 * the policy itself. Now that we will have ipv4-in-ipv6 1433 * and ipv6-in-ipv4 tunnels, this is no longer true. 1434 */ 1435 if (!ut[i].family) 1436 ut[i].family = family; 1437 1438 switch (ut[i].family) { 1439 case AF_INET: 1440 break; 1441 #if IS_ENABLED(CONFIG_IPV6) 1442 case AF_INET6: 1443 break; 1444 #endif 1445 default: 1446 return -EINVAL; 1447 } 1448 } 1449 1450 return 0; 1451 } 1452 1453 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs) 1454 { 1455 struct nlattr *rt = attrs[XFRMA_TMPL]; 1456 1457 if (!rt) { 1458 pol->xfrm_nr = 0; 1459 } else { 1460 struct xfrm_user_tmpl *utmpl = nla_data(rt); 1461 int nr = nla_len(rt) / sizeof(*utmpl); 1462 int err; 1463 1464 err = validate_tmpl(nr, utmpl, pol->family); 1465 if (err) 1466 return err; 1467 1468 copy_templates(pol, utmpl, nr); 1469 } 1470 return 0; 1471 } 1472 1473 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs) 1474 { 1475 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE]; 1476 struct xfrm_userpolicy_type *upt; 1477 u8 type = XFRM_POLICY_TYPE_MAIN; 1478 int err; 1479 1480 if (rt) { 1481 upt = nla_data(rt); 1482 type = upt->type; 1483 } 1484 1485 err = verify_policy_type(type); 1486 if (err) 1487 return err; 1488 1489 *tp = type; 1490 return 0; 1491 } 1492 1493 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p) 1494 { 1495 xp->priority = p->priority; 1496 xp->index = p->index; 1497 memcpy(&xp->selector, &p->sel, sizeof(xp->selector)); 1498 memcpy(&xp->lft, &p->lft, sizeof(xp->lft)); 1499 xp->action = p->action; 1500 xp->flags = p->flags; 1501 xp->family = p->sel.family; 1502 /* XXX xp->share = p->share; */ 1503 } 1504 1505 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir) 1506 { 1507 memset(p, 0, sizeof(*p)); 1508 memcpy(&p->sel, &xp->selector, sizeof(p->sel)); 1509 memcpy(&p->lft, &xp->lft, sizeof(p->lft)); 1510 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft)); 1511 p->priority = xp->priority; 1512 p->index = xp->index; 1513 p->sel.family = xp->family; 1514 p->dir = dir; 1515 p->action = xp->action; 1516 p->flags = xp->flags; 1517 p->share = XFRM_SHARE_ANY; /* XXX xp->share */ 1518 } 1519 1520 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp) 1521 { 1522 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL); 1523 int err; 1524 1525 if (!xp) { 1526 *errp = -ENOMEM; 1527 return NULL; 1528 } 1529 1530 copy_from_user_policy(xp, p); 1531 1532 err = copy_from_user_policy_type(&xp->type, attrs); 1533 if (err) 1534 goto error; 1535 1536 if (!(err = copy_from_user_tmpl(xp, attrs))) 1537 err = copy_from_user_sec_ctx(xp, attrs); 1538 if (err) 1539 goto error; 1540 1541 xfrm_mark_get(attrs, &xp->mark); 1542 1543 return xp; 1544 error: 1545 *errp = err; 1546 xp->walk.dead = 1; 1547 xfrm_policy_destroy(xp); 1548 return NULL; 1549 } 1550 1551 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1552 struct nlattr **attrs) 1553 { 1554 struct net *net = sock_net(skb->sk); 1555 struct xfrm_userpolicy_info *p = nlmsg_data(nlh); 1556 struct xfrm_policy *xp; 1557 struct km_event c; 1558 int err; 1559 int excl; 1560 1561 err = verify_newpolicy_info(p); 1562 if (err) 1563 return err; 1564 err = verify_sec_ctx_len(attrs); 1565 if (err) 1566 return err; 1567 1568 xp = xfrm_policy_construct(net, p, attrs, &err); 1569 if (!xp) 1570 return err; 1571 1572 /* shouldn't excl be based on nlh flags?? 1573 * Aha! this is anti-netlink really i.e more pfkey derived 1574 * in netlink excl is a flag and you wouldnt need 1575 * a type XFRM_MSG_UPDPOLICY - JHS */ 1576 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY; 1577 err = xfrm_policy_insert(p->dir, xp, excl); 1578 xfrm_audit_policy_add(xp, err ? 0 : 1, true); 1579 1580 if (err) { 1581 security_xfrm_policy_free(xp->security); 1582 kfree(xp); 1583 return err; 1584 } 1585 1586 c.event = nlh->nlmsg_type; 1587 c.seq = nlh->nlmsg_seq; 1588 c.portid = nlh->nlmsg_pid; 1589 km_policy_notify(xp, p->dir, &c); 1590 1591 xfrm_pol_put(xp); 1592 1593 return 0; 1594 } 1595 1596 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb) 1597 { 1598 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH]; 1599 int i; 1600 1601 if (xp->xfrm_nr == 0) 1602 return 0; 1603 1604 for (i = 0; i < xp->xfrm_nr; i++) { 1605 struct xfrm_user_tmpl *up = &vec[i]; 1606 struct xfrm_tmpl *kp = &xp->xfrm_vec[i]; 1607 1608 memset(up, 0, sizeof(*up)); 1609 memcpy(&up->id, &kp->id, sizeof(up->id)); 1610 up->family = kp->encap_family; 1611 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr)); 1612 up->reqid = kp->reqid; 1613 up->mode = kp->mode; 1614 up->share = kp->share; 1615 up->optional = kp->optional; 1616 up->aalgos = kp->aalgos; 1617 up->ealgos = kp->ealgos; 1618 up->calgos = kp->calgos; 1619 } 1620 1621 return nla_put(skb, XFRMA_TMPL, 1622 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec); 1623 } 1624 1625 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb) 1626 { 1627 if (x->security) { 1628 return copy_sec_ctx(x->security, skb); 1629 } 1630 return 0; 1631 } 1632 1633 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb) 1634 { 1635 if (xp->security) 1636 return copy_sec_ctx(xp->security, skb); 1637 return 0; 1638 } 1639 static inline unsigned int userpolicy_type_attrsize(void) 1640 { 1641 #ifdef CONFIG_XFRM_SUB_POLICY 1642 return nla_total_size(sizeof(struct xfrm_userpolicy_type)); 1643 #else 1644 return 0; 1645 #endif 1646 } 1647 1648 #ifdef CONFIG_XFRM_SUB_POLICY 1649 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1650 { 1651 struct xfrm_userpolicy_type upt = { 1652 .type = type, 1653 }; 1654 1655 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt); 1656 } 1657 1658 #else 1659 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1660 { 1661 return 0; 1662 } 1663 #endif 1664 1665 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr) 1666 { 1667 struct xfrm_dump_info *sp = ptr; 1668 struct xfrm_userpolicy_info *p; 1669 struct sk_buff *in_skb = sp->in_skb; 1670 struct sk_buff *skb = sp->out_skb; 1671 struct nlmsghdr *nlh; 1672 int err; 1673 1674 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, 1675 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags); 1676 if (nlh == NULL) 1677 return -EMSGSIZE; 1678 1679 p = nlmsg_data(nlh); 1680 copy_to_user_policy(xp, p, dir); 1681 err = copy_to_user_tmpl(xp, skb); 1682 if (!err) 1683 err = copy_to_user_sec_ctx(xp, skb); 1684 if (!err) 1685 err = copy_to_user_policy_type(xp->type, skb); 1686 if (!err) 1687 err = xfrm_mark_put(skb, &xp->mark); 1688 if (err) { 1689 nlmsg_cancel(skb, nlh); 1690 return err; 1691 } 1692 nlmsg_end(skb, nlh); 1693 return 0; 1694 } 1695 1696 static int xfrm_dump_policy_done(struct netlink_callback *cb) 1697 { 1698 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args; 1699 struct net *net = sock_net(cb->skb->sk); 1700 1701 xfrm_policy_walk_done(walk, net); 1702 return 0; 1703 } 1704 1705 static int xfrm_dump_policy_start(struct netlink_callback *cb) 1706 { 1707 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args; 1708 1709 BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args)); 1710 1711 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY); 1712 return 0; 1713 } 1714 1715 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb) 1716 { 1717 struct net *net = sock_net(skb->sk); 1718 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args; 1719 struct xfrm_dump_info info; 1720 1721 info.in_skb = cb->skb; 1722 info.out_skb = skb; 1723 info.nlmsg_seq = cb->nlh->nlmsg_seq; 1724 info.nlmsg_flags = NLM_F_MULTI; 1725 1726 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info); 1727 1728 return skb->len; 1729 } 1730 1731 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb, 1732 struct xfrm_policy *xp, 1733 int dir, u32 seq) 1734 { 1735 struct xfrm_dump_info info; 1736 struct sk_buff *skb; 1737 int err; 1738 1739 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1740 if (!skb) 1741 return ERR_PTR(-ENOMEM); 1742 1743 info.in_skb = in_skb; 1744 info.out_skb = skb; 1745 info.nlmsg_seq = seq; 1746 info.nlmsg_flags = 0; 1747 1748 err = dump_one_policy(xp, dir, 0, &info); 1749 if (err) { 1750 kfree_skb(skb); 1751 return ERR_PTR(err); 1752 } 1753 1754 return skb; 1755 } 1756 1757 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1758 struct nlattr **attrs) 1759 { 1760 struct net *net = sock_net(skb->sk); 1761 struct xfrm_policy *xp; 1762 struct xfrm_userpolicy_id *p; 1763 u8 type = XFRM_POLICY_TYPE_MAIN; 1764 int err; 1765 struct km_event c; 1766 int delete; 1767 struct xfrm_mark m; 1768 u32 mark = xfrm_mark_get(attrs, &m); 1769 1770 p = nlmsg_data(nlh); 1771 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY; 1772 1773 err = copy_from_user_policy_type(&type, attrs); 1774 if (err) 1775 return err; 1776 1777 err = verify_policy_dir(p->dir); 1778 if (err) 1779 return err; 1780 1781 if (p->index) 1782 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err); 1783 else { 1784 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1785 struct xfrm_sec_ctx *ctx; 1786 1787 err = verify_sec_ctx_len(attrs); 1788 if (err) 1789 return err; 1790 1791 ctx = NULL; 1792 if (rt) { 1793 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 1794 1795 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); 1796 if (err) 1797 return err; 1798 } 1799 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel, 1800 ctx, delete, &err); 1801 security_xfrm_policy_free(ctx); 1802 } 1803 if (xp == NULL) 1804 return -ENOENT; 1805 1806 if (!delete) { 1807 struct sk_buff *resp_skb; 1808 1809 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq); 1810 if (IS_ERR(resp_skb)) { 1811 err = PTR_ERR(resp_skb); 1812 } else { 1813 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, 1814 NETLINK_CB(skb).portid); 1815 } 1816 } else { 1817 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 1818 1819 if (err != 0) 1820 goto out; 1821 1822 c.data.byid = p->index; 1823 c.event = nlh->nlmsg_type; 1824 c.seq = nlh->nlmsg_seq; 1825 c.portid = nlh->nlmsg_pid; 1826 km_policy_notify(xp, p->dir, &c); 1827 } 1828 1829 out: 1830 xfrm_pol_put(xp); 1831 return err; 1832 } 1833 1834 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 1835 struct nlattr **attrs) 1836 { 1837 struct net *net = sock_net(skb->sk); 1838 struct km_event c; 1839 struct xfrm_usersa_flush *p = nlmsg_data(nlh); 1840 int err; 1841 1842 err = xfrm_state_flush(net, p->proto, true); 1843 if (err) { 1844 if (err == -ESRCH) /* empty table */ 1845 return 0; 1846 return err; 1847 } 1848 c.data.proto = p->proto; 1849 c.event = nlh->nlmsg_type; 1850 c.seq = nlh->nlmsg_seq; 1851 c.portid = nlh->nlmsg_pid; 1852 c.net = net; 1853 km_state_notify(NULL, &c); 1854 1855 return 0; 1856 } 1857 1858 static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x) 1859 { 1860 unsigned int replay_size = x->replay_esn ? 1861 xfrm_replay_state_esn_len(x->replay_esn) : 1862 sizeof(struct xfrm_replay_state); 1863 1864 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id)) 1865 + nla_total_size(replay_size) 1866 + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur)) 1867 + nla_total_size(sizeof(struct xfrm_mark)) 1868 + nla_total_size(4) /* XFRM_AE_RTHR */ 1869 + nla_total_size(4); /* XFRM_AE_ETHR */ 1870 } 1871 1872 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 1873 { 1874 struct xfrm_aevent_id *id; 1875 struct nlmsghdr *nlh; 1876 int err; 1877 1878 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0); 1879 if (nlh == NULL) 1880 return -EMSGSIZE; 1881 1882 id = nlmsg_data(nlh); 1883 memset(&id->sa_id, 0, sizeof(id->sa_id)); 1884 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr)); 1885 id->sa_id.spi = x->id.spi; 1886 id->sa_id.family = x->props.family; 1887 id->sa_id.proto = x->id.proto; 1888 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr)); 1889 id->reqid = x->props.reqid; 1890 id->flags = c->data.aevent; 1891 1892 if (x->replay_esn) { 1893 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL, 1894 xfrm_replay_state_esn_len(x->replay_esn), 1895 x->replay_esn); 1896 } else { 1897 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), 1898 &x->replay); 1899 } 1900 if (err) 1901 goto out_cancel; 1902 err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft, 1903 XFRMA_PAD); 1904 if (err) 1905 goto out_cancel; 1906 1907 if (id->flags & XFRM_AE_RTHR) { 1908 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff); 1909 if (err) 1910 goto out_cancel; 1911 } 1912 if (id->flags & XFRM_AE_ETHR) { 1913 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH, 1914 x->replay_maxage * 10 / HZ); 1915 if (err) 1916 goto out_cancel; 1917 } 1918 err = xfrm_mark_put(skb, &x->mark); 1919 if (err) 1920 goto out_cancel; 1921 1922 nlmsg_end(skb, nlh); 1923 return 0; 1924 1925 out_cancel: 1926 nlmsg_cancel(skb, nlh); 1927 return err; 1928 } 1929 1930 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 1931 struct nlattr **attrs) 1932 { 1933 struct net *net = sock_net(skb->sk); 1934 struct xfrm_state *x; 1935 struct sk_buff *r_skb; 1936 int err; 1937 struct km_event c; 1938 u32 mark; 1939 struct xfrm_mark m; 1940 struct xfrm_aevent_id *p = nlmsg_data(nlh); 1941 struct xfrm_usersa_id *id = &p->sa_id; 1942 1943 mark = xfrm_mark_get(attrs, &m); 1944 1945 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family); 1946 if (x == NULL) 1947 return -ESRCH; 1948 1949 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 1950 if (r_skb == NULL) { 1951 xfrm_state_put(x); 1952 return -ENOMEM; 1953 } 1954 1955 /* 1956 * XXX: is this lock really needed - none of the other 1957 * gets lock (the concern is things getting updated 1958 * while we are still reading) - jhs 1959 */ 1960 spin_lock_bh(&x->lock); 1961 c.data.aevent = p->flags; 1962 c.seq = nlh->nlmsg_seq; 1963 c.portid = nlh->nlmsg_pid; 1964 1965 err = build_aevent(r_skb, x, &c); 1966 BUG_ON(err < 0); 1967 1968 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid); 1969 spin_unlock_bh(&x->lock); 1970 xfrm_state_put(x); 1971 return err; 1972 } 1973 1974 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 1975 struct nlattr **attrs) 1976 { 1977 struct net *net = sock_net(skb->sk); 1978 struct xfrm_state *x; 1979 struct km_event c; 1980 int err = -EINVAL; 1981 u32 mark = 0; 1982 struct xfrm_mark m; 1983 struct xfrm_aevent_id *p = nlmsg_data(nlh); 1984 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 1985 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL]; 1986 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 1987 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; 1988 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; 1989 1990 if (!lt && !rp && !re && !et && !rt) 1991 return err; 1992 1993 /* pedantic mode - thou shalt sayeth replaceth */ 1994 if (!(nlh->nlmsg_flags&NLM_F_REPLACE)) 1995 return err; 1996 1997 mark = xfrm_mark_get(attrs, &m); 1998 1999 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family); 2000 if (x == NULL) 2001 return -ESRCH; 2002 2003 if (x->km.state != XFRM_STATE_VALID) 2004 goto out; 2005 2006 err = xfrm_replay_verify_len(x->replay_esn, re); 2007 if (err) 2008 goto out; 2009 2010 spin_lock_bh(&x->lock); 2011 xfrm_update_ae_params(x, attrs, 1); 2012 spin_unlock_bh(&x->lock); 2013 2014 c.event = nlh->nlmsg_type; 2015 c.seq = nlh->nlmsg_seq; 2016 c.portid = nlh->nlmsg_pid; 2017 c.data.aevent = XFRM_AE_CU; 2018 km_state_notify(x, &c); 2019 err = 0; 2020 out: 2021 xfrm_state_put(x); 2022 return err; 2023 } 2024 2025 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 2026 struct nlattr **attrs) 2027 { 2028 struct net *net = sock_net(skb->sk); 2029 struct km_event c; 2030 u8 type = XFRM_POLICY_TYPE_MAIN; 2031 int err; 2032 2033 err = copy_from_user_policy_type(&type, attrs); 2034 if (err) 2035 return err; 2036 2037 err = xfrm_policy_flush(net, type, true); 2038 if (err) { 2039 if (err == -ESRCH) /* empty table */ 2040 return 0; 2041 return err; 2042 } 2043 2044 c.data.type = type; 2045 c.event = nlh->nlmsg_type; 2046 c.seq = nlh->nlmsg_seq; 2047 c.portid = nlh->nlmsg_pid; 2048 c.net = net; 2049 km_policy_notify(NULL, 0, &c); 2050 return 0; 2051 } 2052 2053 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 2054 struct nlattr **attrs) 2055 { 2056 struct net *net = sock_net(skb->sk); 2057 struct xfrm_policy *xp; 2058 struct xfrm_user_polexpire *up = nlmsg_data(nlh); 2059 struct xfrm_userpolicy_info *p = &up->pol; 2060 u8 type = XFRM_POLICY_TYPE_MAIN; 2061 int err = -ENOENT; 2062 struct xfrm_mark m; 2063 u32 mark = xfrm_mark_get(attrs, &m); 2064 2065 err = copy_from_user_policy_type(&type, attrs); 2066 if (err) 2067 return err; 2068 2069 err = verify_policy_dir(p->dir); 2070 if (err) 2071 return err; 2072 2073 if (p->index) 2074 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err); 2075 else { 2076 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 2077 struct xfrm_sec_ctx *ctx; 2078 2079 err = verify_sec_ctx_len(attrs); 2080 if (err) 2081 return err; 2082 2083 ctx = NULL; 2084 if (rt) { 2085 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 2086 2087 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); 2088 if (err) 2089 return err; 2090 } 2091 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, 2092 &p->sel, ctx, 0, &err); 2093 security_xfrm_policy_free(ctx); 2094 } 2095 if (xp == NULL) 2096 return -ENOENT; 2097 2098 if (unlikely(xp->walk.dead)) 2099 goto out; 2100 2101 err = 0; 2102 if (up->hard) { 2103 xfrm_policy_delete(xp, p->dir); 2104 xfrm_audit_policy_delete(xp, 1, true); 2105 } 2106 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid); 2107 2108 out: 2109 xfrm_pol_put(xp); 2110 return err; 2111 } 2112 2113 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 2114 struct nlattr **attrs) 2115 { 2116 struct net *net = sock_net(skb->sk); 2117 struct xfrm_state *x; 2118 int err; 2119 struct xfrm_user_expire *ue = nlmsg_data(nlh); 2120 struct xfrm_usersa_info *p = &ue->state; 2121 struct xfrm_mark m; 2122 u32 mark = xfrm_mark_get(attrs, &m); 2123 2124 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family); 2125 2126 err = -ENOENT; 2127 if (x == NULL) 2128 return err; 2129 2130 spin_lock_bh(&x->lock); 2131 err = -EINVAL; 2132 if (x->km.state != XFRM_STATE_VALID) 2133 goto out; 2134 km_state_expired(x, ue->hard, nlh->nlmsg_pid); 2135 2136 if (ue->hard) { 2137 __xfrm_state_delete(x); 2138 xfrm_audit_state_delete(x, 1, true); 2139 } 2140 err = 0; 2141 out: 2142 spin_unlock_bh(&x->lock); 2143 xfrm_state_put(x); 2144 return err; 2145 } 2146 2147 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, 2148 struct nlattr **attrs) 2149 { 2150 struct net *net = sock_net(skb->sk); 2151 struct xfrm_policy *xp; 2152 struct xfrm_user_tmpl *ut; 2153 int i; 2154 struct nlattr *rt = attrs[XFRMA_TMPL]; 2155 struct xfrm_mark mark; 2156 2157 struct xfrm_user_acquire *ua = nlmsg_data(nlh); 2158 struct xfrm_state *x = xfrm_state_alloc(net); 2159 int err = -ENOMEM; 2160 2161 if (!x) 2162 goto nomem; 2163 2164 xfrm_mark_get(attrs, &mark); 2165 2166 err = verify_newpolicy_info(&ua->policy); 2167 if (err) 2168 goto free_state; 2169 2170 /* build an XP */ 2171 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err); 2172 if (!xp) 2173 goto free_state; 2174 2175 memcpy(&x->id, &ua->id, sizeof(ua->id)); 2176 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr)); 2177 memcpy(&x->sel, &ua->sel, sizeof(ua->sel)); 2178 xp->mark.m = x->mark.m = mark.m; 2179 xp->mark.v = x->mark.v = mark.v; 2180 ut = nla_data(rt); 2181 /* extract the templates and for each call km_key */ 2182 for (i = 0; i < xp->xfrm_nr; i++, ut++) { 2183 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 2184 memcpy(&x->id, &t->id, sizeof(x->id)); 2185 x->props.mode = t->mode; 2186 x->props.reqid = t->reqid; 2187 x->props.family = ut->family; 2188 t->aalgos = ua->aalgos; 2189 t->ealgos = ua->ealgos; 2190 t->calgos = ua->calgos; 2191 err = km_query(x, t, xp); 2192 2193 } 2194 2195 kfree(x); 2196 kfree(xp); 2197 2198 return 0; 2199 2200 free_state: 2201 kfree(x); 2202 nomem: 2203 return err; 2204 } 2205 2206 #ifdef CONFIG_XFRM_MIGRATE 2207 static int copy_from_user_migrate(struct xfrm_migrate *ma, 2208 struct xfrm_kmaddress *k, 2209 struct nlattr **attrs, int *num) 2210 { 2211 struct nlattr *rt = attrs[XFRMA_MIGRATE]; 2212 struct xfrm_user_migrate *um; 2213 int i, num_migrate; 2214 2215 if (k != NULL) { 2216 struct xfrm_user_kmaddress *uk; 2217 2218 uk = nla_data(attrs[XFRMA_KMADDRESS]); 2219 memcpy(&k->local, &uk->local, sizeof(k->local)); 2220 memcpy(&k->remote, &uk->remote, sizeof(k->remote)); 2221 k->family = uk->family; 2222 k->reserved = uk->reserved; 2223 } 2224 2225 um = nla_data(rt); 2226 num_migrate = nla_len(rt) / sizeof(*um); 2227 2228 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH) 2229 return -EINVAL; 2230 2231 for (i = 0; i < num_migrate; i++, um++, ma++) { 2232 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr)); 2233 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr)); 2234 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr)); 2235 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr)); 2236 2237 ma->proto = um->proto; 2238 ma->mode = um->mode; 2239 ma->reqid = um->reqid; 2240 2241 ma->old_family = um->old_family; 2242 ma->new_family = um->new_family; 2243 } 2244 2245 *num = i; 2246 return 0; 2247 } 2248 2249 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 2250 struct nlattr **attrs) 2251 { 2252 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh); 2253 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 2254 struct xfrm_kmaddress km, *kmp; 2255 u8 type; 2256 int err; 2257 int n = 0; 2258 struct net *net = sock_net(skb->sk); 2259 struct xfrm_encap_tmpl *encap = NULL; 2260 2261 if (attrs[XFRMA_MIGRATE] == NULL) 2262 return -EINVAL; 2263 2264 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL; 2265 2266 err = copy_from_user_policy_type(&type, attrs); 2267 if (err) 2268 return err; 2269 2270 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n); 2271 if (err) 2272 return err; 2273 2274 if (!n) 2275 return 0; 2276 2277 if (attrs[XFRMA_ENCAP]) { 2278 encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]), 2279 sizeof(*encap), GFP_KERNEL); 2280 if (!encap) 2281 return 0; 2282 } 2283 2284 err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap); 2285 2286 kfree(encap); 2287 2288 return err; 2289 } 2290 #else 2291 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 2292 struct nlattr **attrs) 2293 { 2294 return -ENOPROTOOPT; 2295 } 2296 #endif 2297 2298 #ifdef CONFIG_XFRM_MIGRATE 2299 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb) 2300 { 2301 struct xfrm_user_migrate um; 2302 2303 memset(&um, 0, sizeof(um)); 2304 um.proto = m->proto; 2305 um.mode = m->mode; 2306 um.reqid = m->reqid; 2307 um.old_family = m->old_family; 2308 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr)); 2309 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr)); 2310 um.new_family = m->new_family; 2311 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr)); 2312 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr)); 2313 2314 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um); 2315 } 2316 2317 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb) 2318 { 2319 struct xfrm_user_kmaddress uk; 2320 2321 memset(&uk, 0, sizeof(uk)); 2322 uk.family = k->family; 2323 uk.reserved = k->reserved; 2324 memcpy(&uk.local, &k->local, sizeof(uk.local)); 2325 memcpy(&uk.remote, &k->remote, sizeof(uk.remote)); 2326 2327 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk); 2328 } 2329 2330 static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma, 2331 int with_encp) 2332 { 2333 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id)) 2334 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0) 2335 + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0) 2336 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate) 2337 + userpolicy_type_attrsize(); 2338 } 2339 2340 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m, 2341 int num_migrate, const struct xfrm_kmaddress *k, 2342 const struct xfrm_selector *sel, 2343 const struct xfrm_encap_tmpl *encap, u8 dir, u8 type) 2344 { 2345 const struct xfrm_migrate *mp; 2346 struct xfrm_userpolicy_id *pol_id; 2347 struct nlmsghdr *nlh; 2348 int i, err; 2349 2350 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0); 2351 if (nlh == NULL) 2352 return -EMSGSIZE; 2353 2354 pol_id = nlmsg_data(nlh); 2355 /* copy data from selector, dir, and type to the pol_id */ 2356 memset(pol_id, 0, sizeof(*pol_id)); 2357 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel)); 2358 pol_id->dir = dir; 2359 2360 if (k != NULL) { 2361 err = copy_to_user_kmaddress(k, skb); 2362 if (err) 2363 goto out_cancel; 2364 } 2365 if (encap) { 2366 err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap); 2367 if (err) 2368 goto out_cancel; 2369 } 2370 err = copy_to_user_policy_type(type, skb); 2371 if (err) 2372 goto out_cancel; 2373 for (i = 0, mp = m ; i < num_migrate; i++, mp++) { 2374 err = copy_to_user_migrate(mp, skb); 2375 if (err) 2376 goto out_cancel; 2377 } 2378 2379 nlmsg_end(skb, nlh); 2380 return 0; 2381 2382 out_cancel: 2383 nlmsg_cancel(skb, nlh); 2384 return err; 2385 } 2386 2387 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2388 const struct xfrm_migrate *m, int num_migrate, 2389 const struct xfrm_kmaddress *k, 2390 const struct xfrm_encap_tmpl *encap) 2391 { 2392 struct net *net = &init_net; 2393 struct sk_buff *skb; 2394 int err; 2395 2396 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap), 2397 GFP_ATOMIC); 2398 if (skb == NULL) 2399 return -ENOMEM; 2400 2401 /* build migrate */ 2402 err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type); 2403 BUG_ON(err < 0); 2404 2405 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE); 2406 } 2407 #else 2408 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 2409 const struct xfrm_migrate *m, int num_migrate, 2410 const struct xfrm_kmaddress *k, 2411 const struct xfrm_encap_tmpl *encap) 2412 { 2413 return -ENOPROTOOPT; 2414 } 2415 #endif 2416 2417 #define XMSGSIZE(type) sizeof(struct type) 2418 2419 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = { 2420 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2421 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2422 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2423 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2424 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2425 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2426 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info), 2427 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire), 2428 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire), 2429 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2430 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2431 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire), 2432 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush), 2433 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0, 2434 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2435 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2436 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report), 2437 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2438 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32), 2439 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 2440 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 2441 }; 2442 2443 #undef XMSGSIZE 2444 2445 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = { 2446 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)}, 2447 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)}, 2448 [XFRMA_LASTUSED] = { .type = NLA_U64}, 2449 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)}, 2450 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) }, 2451 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) }, 2452 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) }, 2453 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) }, 2454 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) }, 2455 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) }, 2456 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) }, 2457 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) }, 2458 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) }, 2459 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 }, 2460 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 }, 2461 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) }, 2462 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) }, 2463 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)}, 2464 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) }, 2465 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) }, 2466 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) }, 2467 [XFRMA_TFCPAD] = { .type = NLA_U32 }, 2468 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) }, 2469 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 }, 2470 [XFRMA_PROTO] = { .type = NLA_U8 }, 2471 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) }, 2472 [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) }, 2473 [XFRMA_OUTPUT_MARK] = { .len = NLA_U32 }, 2474 }; 2475 2476 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = { 2477 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) }, 2478 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) }, 2479 }; 2480 2481 static const struct xfrm_link { 2482 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **); 2483 int (*start)(struct netlink_callback *); 2484 int (*dump)(struct sk_buff *, struct netlink_callback *); 2485 int (*done)(struct netlink_callback *); 2486 const struct nla_policy *nla_pol; 2487 int nla_max; 2488 } xfrm_dispatch[XFRM_NR_MSGTYPES] = { 2489 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 2490 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa }, 2491 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa, 2492 .dump = xfrm_dump_sa, 2493 .done = xfrm_dump_sa_done }, 2494 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 2495 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy }, 2496 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy, 2497 .start = xfrm_dump_policy_start, 2498 .dump = xfrm_dump_policy, 2499 .done = xfrm_dump_policy_done }, 2500 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi }, 2501 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire }, 2502 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire }, 2503 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 2504 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 2505 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire}, 2506 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa }, 2507 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy }, 2508 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae }, 2509 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae }, 2510 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate }, 2511 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo }, 2512 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo, 2513 .nla_pol = xfrma_spd_policy, 2514 .nla_max = XFRMA_SPD_MAX }, 2515 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo }, 2516 }; 2517 2518 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, 2519 struct netlink_ext_ack *extack) 2520 { 2521 struct net *net = sock_net(skb->sk); 2522 struct nlattr *attrs[XFRMA_MAX+1]; 2523 const struct xfrm_link *link; 2524 int type, err; 2525 2526 #ifdef CONFIG_COMPAT 2527 if (in_compat_syscall()) 2528 return -EOPNOTSUPP; 2529 #endif 2530 2531 type = nlh->nlmsg_type; 2532 if (type > XFRM_MSG_MAX) 2533 return -EINVAL; 2534 2535 type -= XFRM_MSG_BASE; 2536 link = &xfrm_dispatch[type]; 2537 2538 /* All operations require privileges, even GET */ 2539 if (!netlink_net_capable(skb, CAP_NET_ADMIN)) 2540 return -EPERM; 2541 2542 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) || 2543 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) && 2544 (nlh->nlmsg_flags & NLM_F_DUMP)) { 2545 if (link->dump == NULL) 2546 return -EINVAL; 2547 2548 { 2549 struct netlink_dump_control c = { 2550 .start = link->start, 2551 .dump = link->dump, 2552 .done = link->done, 2553 }; 2554 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c); 2555 } 2556 } 2557 2558 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, 2559 link->nla_max ? : XFRMA_MAX, 2560 link->nla_pol ? : xfrma_policy, extack); 2561 if (err < 0) 2562 return err; 2563 2564 if (link->doit == NULL) 2565 return -EINVAL; 2566 2567 return link->doit(skb, nlh, attrs); 2568 } 2569 2570 static void xfrm_netlink_rcv(struct sk_buff *skb) 2571 { 2572 struct net *net = sock_net(skb->sk); 2573 2574 mutex_lock(&net->xfrm.xfrm_cfg_mutex); 2575 netlink_rcv_skb(skb, &xfrm_user_rcv_msg); 2576 mutex_unlock(&net->xfrm.xfrm_cfg_mutex); 2577 } 2578 2579 static inline unsigned int xfrm_expire_msgsize(void) 2580 { 2581 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire)) 2582 + nla_total_size(sizeof(struct xfrm_mark)); 2583 } 2584 2585 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) 2586 { 2587 struct xfrm_user_expire *ue; 2588 struct nlmsghdr *nlh; 2589 int err; 2590 2591 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0); 2592 if (nlh == NULL) 2593 return -EMSGSIZE; 2594 2595 ue = nlmsg_data(nlh); 2596 copy_to_user_state(x, &ue->state); 2597 ue->hard = (c->data.hard != 0) ? 1 : 0; 2598 /* clear the padding bytes */ 2599 memset(&ue->hard + 1, 0, sizeof(*ue) - offsetofend(typeof(*ue), hard)); 2600 2601 err = xfrm_mark_put(skb, &x->mark); 2602 if (err) 2603 return err; 2604 2605 nlmsg_end(skb, nlh); 2606 return 0; 2607 } 2608 2609 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c) 2610 { 2611 struct net *net = xs_net(x); 2612 struct sk_buff *skb; 2613 2614 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC); 2615 if (skb == NULL) 2616 return -ENOMEM; 2617 2618 if (build_expire(skb, x, c) < 0) { 2619 kfree_skb(skb); 2620 return -EMSGSIZE; 2621 } 2622 2623 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE); 2624 } 2625 2626 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c) 2627 { 2628 struct net *net = xs_net(x); 2629 struct sk_buff *skb; 2630 int err; 2631 2632 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); 2633 if (skb == NULL) 2634 return -ENOMEM; 2635 2636 err = build_aevent(skb, x, c); 2637 BUG_ON(err < 0); 2638 2639 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS); 2640 } 2641 2642 static int xfrm_notify_sa_flush(const struct km_event *c) 2643 { 2644 struct net *net = c->net; 2645 struct xfrm_usersa_flush *p; 2646 struct nlmsghdr *nlh; 2647 struct sk_buff *skb; 2648 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush)); 2649 2650 skb = nlmsg_new(len, GFP_ATOMIC); 2651 if (skb == NULL) 2652 return -ENOMEM; 2653 2654 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0); 2655 if (nlh == NULL) { 2656 kfree_skb(skb); 2657 return -EMSGSIZE; 2658 } 2659 2660 p = nlmsg_data(nlh); 2661 p->proto = c->data.proto; 2662 2663 nlmsg_end(skb, nlh); 2664 2665 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA); 2666 } 2667 2668 static inline unsigned int xfrm_sa_len(struct xfrm_state *x) 2669 { 2670 unsigned int l = 0; 2671 if (x->aead) 2672 l += nla_total_size(aead_len(x->aead)); 2673 if (x->aalg) { 2674 l += nla_total_size(sizeof(struct xfrm_algo) + 2675 (x->aalg->alg_key_len + 7) / 8); 2676 l += nla_total_size(xfrm_alg_auth_len(x->aalg)); 2677 } 2678 if (x->ealg) 2679 l += nla_total_size(xfrm_alg_len(x->ealg)); 2680 if (x->calg) 2681 l += nla_total_size(sizeof(*x->calg)); 2682 if (x->encap) 2683 l += nla_total_size(sizeof(*x->encap)); 2684 if (x->tfcpad) 2685 l += nla_total_size(sizeof(x->tfcpad)); 2686 if (x->replay_esn) 2687 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn)); 2688 else 2689 l += nla_total_size(sizeof(struct xfrm_replay_state)); 2690 if (x->security) 2691 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) + 2692 x->security->ctx_len); 2693 if (x->coaddr) 2694 l += nla_total_size(sizeof(*x->coaddr)); 2695 if (x->props.extra_flags) 2696 l += nla_total_size(sizeof(x->props.extra_flags)); 2697 if (x->xso.dev) 2698 l += nla_total_size(sizeof(x->xso)); 2699 if (x->props.output_mark) 2700 l += nla_total_size(sizeof(x->props.output_mark)); 2701 2702 /* Must count x->lastused as it may become non-zero behind our back. */ 2703 l += nla_total_size_64bit(sizeof(u64)); 2704 2705 return l; 2706 } 2707 2708 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c) 2709 { 2710 struct net *net = xs_net(x); 2711 struct xfrm_usersa_info *p; 2712 struct xfrm_usersa_id *id; 2713 struct nlmsghdr *nlh; 2714 struct sk_buff *skb; 2715 unsigned int len = xfrm_sa_len(x); 2716 unsigned int headlen; 2717 int err; 2718 2719 headlen = sizeof(*p); 2720 if (c->event == XFRM_MSG_DELSA) { 2721 len += nla_total_size(headlen); 2722 headlen = sizeof(*id); 2723 len += nla_total_size(sizeof(struct xfrm_mark)); 2724 } 2725 len += NLMSG_ALIGN(headlen); 2726 2727 skb = nlmsg_new(len, GFP_ATOMIC); 2728 if (skb == NULL) 2729 return -ENOMEM; 2730 2731 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); 2732 err = -EMSGSIZE; 2733 if (nlh == NULL) 2734 goto out_free_skb; 2735 2736 p = nlmsg_data(nlh); 2737 if (c->event == XFRM_MSG_DELSA) { 2738 struct nlattr *attr; 2739 2740 id = nlmsg_data(nlh); 2741 memset(id, 0, sizeof(*id)); 2742 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr)); 2743 id->spi = x->id.spi; 2744 id->family = x->props.family; 2745 id->proto = x->id.proto; 2746 2747 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p)); 2748 err = -EMSGSIZE; 2749 if (attr == NULL) 2750 goto out_free_skb; 2751 2752 p = nla_data(attr); 2753 } 2754 err = copy_to_user_state_extra(x, p, skb); 2755 if (err) 2756 goto out_free_skb; 2757 2758 nlmsg_end(skb, nlh); 2759 2760 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA); 2761 2762 out_free_skb: 2763 kfree_skb(skb); 2764 return err; 2765 } 2766 2767 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c) 2768 { 2769 2770 switch (c->event) { 2771 case XFRM_MSG_EXPIRE: 2772 return xfrm_exp_state_notify(x, c); 2773 case XFRM_MSG_NEWAE: 2774 return xfrm_aevent_state_notify(x, c); 2775 case XFRM_MSG_DELSA: 2776 case XFRM_MSG_UPDSA: 2777 case XFRM_MSG_NEWSA: 2778 return xfrm_notify_sa(x, c); 2779 case XFRM_MSG_FLUSHSA: 2780 return xfrm_notify_sa_flush(c); 2781 default: 2782 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n", 2783 c->event); 2784 break; 2785 } 2786 2787 return 0; 2788 2789 } 2790 2791 static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x, 2792 struct xfrm_policy *xp) 2793 { 2794 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire)) 2795 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 2796 + nla_total_size(sizeof(struct xfrm_mark)) 2797 + nla_total_size(xfrm_user_sec_ctx_size(x->security)) 2798 + userpolicy_type_attrsize(); 2799 } 2800 2801 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x, 2802 struct xfrm_tmpl *xt, struct xfrm_policy *xp) 2803 { 2804 __u32 seq = xfrm_get_acqseq(); 2805 struct xfrm_user_acquire *ua; 2806 struct nlmsghdr *nlh; 2807 int err; 2808 2809 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0); 2810 if (nlh == NULL) 2811 return -EMSGSIZE; 2812 2813 ua = nlmsg_data(nlh); 2814 memcpy(&ua->id, &x->id, sizeof(ua->id)); 2815 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr)); 2816 memcpy(&ua->sel, &x->sel, sizeof(ua->sel)); 2817 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT); 2818 ua->aalgos = xt->aalgos; 2819 ua->ealgos = xt->ealgos; 2820 ua->calgos = xt->calgos; 2821 ua->seq = x->km.seq = seq; 2822 2823 err = copy_to_user_tmpl(xp, skb); 2824 if (!err) 2825 err = copy_to_user_state_sec_ctx(x, skb); 2826 if (!err) 2827 err = copy_to_user_policy_type(xp->type, skb); 2828 if (!err) 2829 err = xfrm_mark_put(skb, &xp->mark); 2830 if (err) { 2831 nlmsg_cancel(skb, nlh); 2832 return err; 2833 } 2834 2835 nlmsg_end(skb, nlh); 2836 return 0; 2837 } 2838 2839 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt, 2840 struct xfrm_policy *xp) 2841 { 2842 struct net *net = xs_net(x); 2843 struct sk_buff *skb; 2844 int err; 2845 2846 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC); 2847 if (skb == NULL) 2848 return -ENOMEM; 2849 2850 err = build_acquire(skb, x, xt, xp); 2851 BUG_ON(err < 0); 2852 2853 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE); 2854 } 2855 2856 /* User gives us xfrm_user_policy_info followed by an array of 0 2857 * or more templates. 2858 */ 2859 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt, 2860 u8 *data, int len, int *dir) 2861 { 2862 struct net *net = sock_net(sk); 2863 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data; 2864 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1); 2865 struct xfrm_policy *xp; 2866 int nr; 2867 2868 switch (sk->sk_family) { 2869 case AF_INET: 2870 if (opt != IP_XFRM_POLICY) { 2871 *dir = -EOPNOTSUPP; 2872 return NULL; 2873 } 2874 break; 2875 #if IS_ENABLED(CONFIG_IPV6) 2876 case AF_INET6: 2877 if (opt != IPV6_XFRM_POLICY) { 2878 *dir = -EOPNOTSUPP; 2879 return NULL; 2880 } 2881 break; 2882 #endif 2883 default: 2884 *dir = -EINVAL; 2885 return NULL; 2886 } 2887 2888 *dir = -EINVAL; 2889 2890 if (len < sizeof(*p) || 2891 verify_newpolicy_info(p)) 2892 return NULL; 2893 2894 nr = ((len - sizeof(*p)) / sizeof(*ut)); 2895 if (validate_tmpl(nr, ut, p->sel.family)) 2896 return NULL; 2897 2898 if (p->dir > XFRM_POLICY_OUT) 2899 return NULL; 2900 2901 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 2902 if (xp == NULL) { 2903 *dir = -ENOBUFS; 2904 return NULL; 2905 } 2906 2907 copy_from_user_policy(xp, p); 2908 xp->type = XFRM_POLICY_TYPE_MAIN; 2909 copy_templates(xp, ut, nr); 2910 2911 *dir = p->dir; 2912 2913 return xp; 2914 } 2915 2916 static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp) 2917 { 2918 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire)) 2919 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 2920 + nla_total_size(xfrm_user_sec_ctx_size(xp->security)) 2921 + nla_total_size(sizeof(struct xfrm_mark)) 2922 + userpolicy_type_attrsize(); 2923 } 2924 2925 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp, 2926 int dir, const struct km_event *c) 2927 { 2928 struct xfrm_user_polexpire *upe; 2929 int hard = c->data.hard; 2930 struct nlmsghdr *nlh; 2931 int err; 2932 2933 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0); 2934 if (nlh == NULL) 2935 return -EMSGSIZE; 2936 2937 upe = nlmsg_data(nlh); 2938 copy_to_user_policy(xp, &upe->pol, dir); 2939 err = copy_to_user_tmpl(xp, skb); 2940 if (!err) 2941 err = copy_to_user_sec_ctx(xp, skb); 2942 if (!err) 2943 err = copy_to_user_policy_type(xp->type, skb); 2944 if (!err) 2945 err = xfrm_mark_put(skb, &xp->mark); 2946 if (err) { 2947 nlmsg_cancel(skb, nlh); 2948 return err; 2949 } 2950 upe->hard = !!hard; 2951 2952 nlmsg_end(skb, nlh); 2953 return 0; 2954 } 2955 2956 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 2957 { 2958 struct net *net = xp_net(xp); 2959 struct sk_buff *skb; 2960 int err; 2961 2962 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC); 2963 if (skb == NULL) 2964 return -ENOMEM; 2965 2966 err = build_polexpire(skb, xp, dir, c); 2967 BUG_ON(err < 0); 2968 2969 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE); 2970 } 2971 2972 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) 2973 { 2974 unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); 2975 struct net *net = xp_net(xp); 2976 struct xfrm_userpolicy_info *p; 2977 struct xfrm_userpolicy_id *id; 2978 struct nlmsghdr *nlh; 2979 struct sk_buff *skb; 2980 unsigned int headlen; 2981 int err; 2982 2983 headlen = sizeof(*p); 2984 if (c->event == XFRM_MSG_DELPOLICY) { 2985 len += nla_total_size(headlen); 2986 headlen = sizeof(*id); 2987 } 2988 len += userpolicy_type_attrsize(); 2989 len += nla_total_size(sizeof(struct xfrm_mark)); 2990 len += NLMSG_ALIGN(headlen); 2991 2992 skb = nlmsg_new(len, GFP_ATOMIC); 2993 if (skb == NULL) 2994 return -ENOMEM; 2995 2996 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); 2997 err = -EMSGSIZE; 2998 if (nlh == NULL) 2999 goto out_free_skb; 3000 3001 p = nlmsg_data(nlh); 3002 if (c->event == XFRM_MSG_DELPOLICY) { 3003 struct nlattr *attr; 3004 3005 id = nlmsg_data(nlh); 3006 memset(id, 0, sizeof(*id)); 3007 id->dir = dir; 3008 if (c->data.byid) 3009 id->index = xp->index; 3010 else 3011 memcpy(&id->sel, &xp->selector, sizeof(id->sel)); 3012 3013 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p)); 3014 err = -EMSGSIZE; 3015 if (attr == NULL) 3016 goto out_free_skb; 3017 3018 p = nla_data(attr); 3019 } 3020 3021 copy_to_user_policy(xp, p, dir); 3022 err = copy_to_user_tmpl(xp, skb); 3023 if (!err) 3024 err = copy_to_user_policy_type(xp->type, skb); 3025 if (!err) 3026 err = xfrm_mark_put(skb, &xp->mark); 3027 if (err) 3028 goto out_free_skb; 3029 3030 nlmsg_end(skb, nlh); 3031 3032 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 3033 3034 out_free_skb: 3035 kfree_skb(skb); 3036 return err; 3037 } 3038 3039 static int xfrm_notify_policy_flush(const struct km_event *c) 3040 { 3041 struct net *net = c->net; 3042 struct nlmsghdr *nlh; 3043 struct sk_buff *skb; 3044 int err; 3045 3046 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC); 3047 if (skb == NULL) 3048 return -ENOMEM; 3049 3050 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0); 3051 err = -EMSGSIZE; 3052 if (nlh == NULL) 3053 goto out_free_skb; 3054 err = copy_to_user_policy_type(c->data.type, skb); 3055 if (err) 3056 goto out_free_skb; 3057 3058 nlmsg_end(skb, nlh); 3059 3060 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); 3061 3062 out_free_skb: 3063 kfree_skb(skb); 3064 return err; 3065 } 3066 3067 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 3068 { 3069 3070 switch (c->event) { 3071 case XFRM_MSG_NEWPOLICY: 3072 case XFRM_MSG_UPDPOLICY: 3073 case XFRM_MSG_DELPOLICY: 3074 return xfrm_notify_policy(xp, dir, c); 3075 case XFRM_MSG_FLUSHPOLICY: 3076 return xfrm_notify_policy_flush(c); 3077 case XFRM_MSG_POLEXPIRE: 3078 return xfrm_exp_policy_notify(xp, dir, c); 3079 default: 3080 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n", 3081 c->event); 3082 } 3083 3084 return 0; 3085 3086 } 3087 3088 static inline unsigned int xfrm_report_msgsize(void) 3089 { 3090 return NLMSG_ALIGN(sizeof(struct xfrm_user_report)); 3091 } 3092 3093 static int build_report(struct sk_buff *skb, u8 proto, 3094 struct xfrm_selector *sel, xfrm_address_t *addr) 3095 { 3096 struct xfrm_user_report *ur; 3097 struct nlmsghdr *nlh; 3098 3099 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0); 3100 if (nlh == NULL) 3101 return -EMSGSIZE; 3102 3103 ur = nlmsg_data(nlh); 3104 ur->proto = proto; 3105 memcpy(&ur->sel, sel, sizeof(ur->sel)); 3106 3107 if (addr) { 3108 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr); 3109 if (err) { 3110 nlmsg_cancel(skb, nlh); 3111 return err; 3112 } 3113 } 3114 nlmsg_end(skb, nlh); 3115 return 0; 3116 } 3117 3118 static int xfrm_send_report(struct net *net, u8 proto, 3119 struct xfrm_selector *sel, xfrm_address_t *addr) 3120 { 3121 struct sk_buff *skb; 3122 int err; 3123 3124 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC); 3125 if (skb == NULL) 3126 return -ENOMEM; 3127 3128 err = build_report(skb, proto, sel, addr); 3129 BUG_ON(err < 0); 3130 3131 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT); 3132 } 3133 3134 static inline unsigned int xfrm_mapping_msgsize(void) 3135 { 3136 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping)); 3137 } 3138 3139 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x, 3140 xfrm_address_t *new_saddr, __be16 new_sport) 3141 { 3142 struct xfrm_user_mapping *um; 3143 struct nlmsghdr *nlh; 3144 3145 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0); 3146 if (nlh == NULL) 3147 return -EMSGSIZE; 3148 3149 um = nlmsg_data(nlh); 3150 3151 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr)); 3152 um->id.spi = x->id.spi; 3153 um->id.family = x->props.family; 3154 um->id.proto = x->id.proto; 3155 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr)); 3156 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr)); 3157 um->new_sport = new_sport; 3158 um->old_sport = x->encap->encap_sport; 3159 um->reqid = x->props.reqid; 3160 3161 nlmsg_end(skb, nlh); 3162 return 0; 3163 } 3164 3165 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, 3166 __be16 sport) 3167 { 3168 struct net *net = xs_net(x); 3169 struct sk_buff *skb; 3170 int err; 3171 3172 if (x->id.proto != IPPROTO_ESP) 3173 return -EINVAL; 3174 3175 if (!x->encap) 3176 return -EINVAL; 3177 3178 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC); 3179 if (skb == NULL) 3180 return -ENOMEM; 3181 3182 err = build_mapping(skb, x, ipaddr, sport); 3183 BUG_ON(err < 0); 3184 3185 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING); 3186 } 3187 3188 static bool xfrm_is_alive(const struct km_event *c) 3189 { 3190 return (bool)xfrm_acquire_is_on(c->net); 3191 } 3192 3193 static struct xfrm_mgr netlink_mgr = { 3194 .notify = xfrm_send_state_notify, 3195 .acquire = xfrm_send_acquire, 3196 .compile_policy = xfrm_compile_policy, 3197 .notify_policy = xfrm_send_policy_notify, 3198 .report = xfrm_send_report, 3199 .migrate = xfrm_send_migrate, 3200 .new_mapping = xfrm_send_mapping, 3201 .is_alive = xfrm_is_alive, 3202 }; 3203 3204 static int __net_init xfrm_user_net_init(struct net *net) 3205 { 3206 struct sock *nlsk; 3207 struct netlink_kernel_cfg cfg = { 3208 .groups = XFRMNLGRP_MAX, 3209 .input = xfrm_netlink_rcv, 3210 }; 3211 3212 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg); 3213 if (nlsk == NULL) 3214 return -ENOMEM; 3215 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */ 3216 rcu_assign_pointer(net->xfrm.nlsk, nlsk); 3217 return 0; 3218 } 3219 3220 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list) 3221 { 3222 struct net *net; 3223 list_for_each_entry(net, net_exit_list, exit_list) 3224 RCU_INIT_POINTER(net->xfrm.nlsk, NULL); 3225 synchronize_net(); 3226 list_for_each_entry(net, net_exit_list, exit_list) 3227 netlink_kernel_release(net->xfrm.nlsk_stash); 3228 } 3229 3230 static struct pernet_operations xfrm_user_net_ops = { 3231 .init = xfrm_user_net_init, 3232 .exit_batch = xfrm_user_net_exit, 3233 }; 3234 3235 static int __init xfrm_user_init(void) 3236 { 3237 int rv; 3238 3239 printk(KERN_INFO "Initializing XFRM netlink socket\n"); 3240 3241 rv = register_pernet_subsys(&xfrm_user_net_ops); 3242 if (rv < 0) 3243 return rv; 3244 rv = xfrm_register_km(&netlink_mgr); 3245 if (rv < 0) 3246 unregister_pernet_subsys(&xfrm_user_net_ops); 3247 return rv; 3248 } 3249 3250 static void __exit xfrm_user_exit(void) 3251 { 3252 xfrm_unregister_km(&netlink_mgr); 3253 unregister_pernet_subsys(&xfrm_user_net_ops); 3254 } 3255 3256 module_init(xfrm_user_init); 3257 module_exit(xfrm_user_exit); 3258 MODULE_LICENSE("GPL"); 3259 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM); 3260 3261