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/module.h> 14 #include <linux/kernel.h> 15 #include <linux/types.h> 16 #include <linux/slab.h> 17 #include <linux/socket.h> 18 #include <linux/string.h> 19 #include <linux/net.h> 20 #include <linux/skbuff.h> 21 #include <linux/rtnetlink.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 <asm/uaccess.h> 30 31 static int verify_one_alg(struct rtattr **xfrma, enum xfrm_attr_type_t type) 32 { 33 struct rtattr *rt = xfrma[type - 1]; 34 struct xfrm_algo *algp; 35 int len; 36 37 if (!rt) 38 return 0; 39 40 len = (rt->rta_len - sizeof(*rt)) - sizeof(*algp); 41 if (len < 0) 42 return -EINVAL; 43 44 algp = RTA_DATA(rt); 45 46 len -= (algp->alg_key_len + 7U) / 8; 47 if (len < 0) 48 return -EINVAL; 49 50 switch (type) { 51 case XFRMA_ALG_AUTH: 52 if (!algp->alg_key_len && 53 strcmp(algp->alg_name, "digest_null") != 0) 54 return -EINVAL; 55 break; 56 57 case XFRMA_ALG_CRYPT: 58 if (!algp->alg_key_len && 59 strcmp(algp->alg_name, "cipher_null") != 0) 60 return -EINVAL; 61 break; 62 63 case XFRMA_ALG_COMP: 64 /* Zero length keys are legal. */ 65 break; 66 67 default: 68 return -EINVAL; 69 }; 70 71 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; 72 return 0; 73 } 74 75 static int verify_encap_tmpl(struct rtattr **xfrma) 76 { 77 struct rtattr *rt = xfrma[XFRMA_ENCAP - 1]; 78 struct xfrm_encap_tmpl *encap; 79 80 if (!rt) 81 return 0; 82 83 if ((rt->rta_len - sizeof(*rt)) < sizeof(*encap)) 84 return -EINVAL; 85 86 return 0; 87 } 88 89 90 static inline int verify_sec_ctx_len(struct rtattr **xfrma) 91 { 92 struct rtattr *rt = xfrma[XFRMA_SEC_CTX - 1]; 93 struct xfrm_user_sec_ctx *uctx; 94 int len = 0; 95 96 if (!rt) 97 return 0; 98 99 if (rt->rta_len < sizeof(*uctx)) 100 return -EINVAL; 101 102 uctx = RTA_DATA(rt); 103 104 len += sizeof(struct xfrm_user_sec_ctx); 105 len += uctx->ctx_len; 106 107 if (uctx->len != len) 108 return -EINVAL; 109 110 return 0; 111 } 112 113 114 static int verify_newsa_info(struct xfrm_usersa_info *p, 115 struct rtattr **xfrma) 116 { 117 int err; 118 119 err = -EINVAL; 120 switch (p->family) { 121 case AF_INET: 122 break; 123 124 case AF_INET6: 125 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 126 break; 127 #else 128 err = -EAFNOSUPPORT; 129 goto out; 130 #endif 131 132 default: 133 goto out; 134 }; 135 136 err = -EINVAL; 137 switch (p->id.proto) { 138 case IPPROTO_AH: 139 if (!xfrma[XFRMA_ALG_AUTH-1] || 140 xfrma[XFRMA_ALG_CRYPT-1] || 141 xfrma[XFRMA_ALG_COMP-1]) 142 goto out; 143 break; 144 145 case IPPROTO_ESP: 146 if ((!xfrma[XFRMA_ALG_AUTH-1] && 147 !xfrma[XFRMA_ALG_CRYPT-1]) || 148 xfrma[XFRMA_ALG_COMP-1]) 149 goto out; 150 break; 151 152 case IPPROTO_COMP: 153 if (!xfrma[XFRMA_ALG_COMP-1] || 154 xfrma[XFRMA_ALG_AUTH-1] || 155 xfrma[XFRMA_ALG_CRYPT-1]) 156 goto out; 157 break; 158 159 default: 160 goto out; 161 }; 162 163 if ((err = verify_one_alg(xfrma, XFRMA_ALG_AUTH))) 164 goto out; 165 if ((err = verify_one_alg(xfrma, XFRMA_ALG_CRYPT))) 166 goto out; 167 if ((err = verify_one_alg(xfrma, XFRMA_ALG_COMP))) 168 goto out; 169 if ((err = verify_encap_tmpl(xfrma))) 170 goto out; 171 if ((err = verify_sec_ctx_len(xfrma))) 172 goto out; 173 174 err = -EINVAL; 175 switch (p->mode) { 176 case 0: 177 case 1: 178 break; 179 180 default: 181 goto out; 182 }; 183 184 err = 0; 185 186 out: 187 return err; 188 } 189 190 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props, 191 struct xfrm_algo_desc *(*get_byname)(char *, int), 192 struct rtattr *u_arg) 193 { 194 struct rtattr *rta = u_arg; 195 struct xfrm_algo *p, *ualg; 196 struct xfrm_algo_desc *algo; 197 int len; 198 199 if (!rta) 200 return 0; 201 202 ualg = RTA_DATA(rta); 203 204 algo = get_byname(ualg->alg_name, 1); 205 if (!algo) 206 return -ENOSYS; 207 *props = algo->desc.sadb_alg_id; 208 209 len = sizeof(*ualg) + (ualg->alg_key_len + 7U) / 8; 210 p = kmalloc(len, GFP_KERNEL); 211 if (!p) 212 return -ENOMEM; 213 214 memcpy(p, ualg, len); 215 *algpp = p; 216 return 0; 217 } 218 219 static int attach_encap_tmpl(struct xfrm_encap_tmpl **encapp, struct rtattr *u_arg) 220 { 221 struct rtattr *rta = u_arg; 222 struct xfrm_encap_tmpl *p, *uencap; 223 224 if (!rta) 225 return 0; 226 227 uencap = RTA_DATA(rta); 228 p = kmalloc(sizeof(*p), GFP_KERNEL); 229 if (!p) 230 return -ENOMEM; 231 232 memcpy(p, uencap, sizeof(*p)); 233 *encapp = p; 234 return 0; 235 } 236 237 238 static inline int xfrm_user_sec_ctx_size(struct xfrm_policy *xp) 239 { 240 struct xfrm_sec_ctx *xfrm_ctx = xp->security; 241 int len = 0; 242 243 if (xfrm_ctx) { 244 len += sizeof(struct xfrm_user_sec_ctx); 245 len += xfrm_ctx->ctx_len; 246 } 247 return len; 248 } 249 250 static int attach_sec_ctx(struct xfrm_state *x, struct rtattr *u_arg) 251 { 252 struct xfrm_user_sec_ctx *uctx; 253 254 if (!u_arg) 255 return 0; 256 257 uctx = RTA_DATA(u_arg); 258 return security_xfrm_state_alloc(x, uctx); 259 } 260 261 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 262 { 263 memcpy(&x->id, &p->id, sizeof(x->id)); 264 memcpy(&x->sel, &p->sel, sizeof(x->sel)); 265 memcpy(&x->lft, &p->lft, sizeof(x->lft)); 266 x->props.mode = p->mode; 267 x->props.replay_window = p->replay_window; 268 x->props.reqid = p->reqid; 269 x->props.family = p->family; 270 x->props.saddr = p->saddr; 271 x->props.flags = p->flags; 272 } 273 274 /* 275 * someday when pfkey also has support, we could have the code 276 * somehow made shareable and move it to xfrm_state.c - JHS 277 * 278 */ 279 static int xfrm_update_ae_params(struct xfrm_state *x, struct rtattr **xfrma) 280 { 281 int err = - EINVAL; 282 struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1]; 283 struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1]; 284 struct rtattr *et = xfrma[XFRMA_ETIMER_THRESH-1]; 285 struct rtattr *rt = xfrma[XFRMA_REPLAY_THRESH-1]; 286 287 if (rp) { 288 struct xfrm_replay_state *replay; 289 if (RTA_PAYLOAD(rp) < sizeof(*replay)) 290 goto error; 291 replay = RTA_DATA(rp); 292 memcpy(&x->replay, replay, sizeof(*replay)); 293 memcpy(&x->preplay, replay, sizeof(*replay)); 294 } 295 296 if (lt) { 297 struct xfrm_lifetime_cur *ltime; 298 if (RTA_PAYLOAD(lt) < sizeof(*ltime)) 299 goto error; 300 ltime = RTA_DATA(lt); 301 x->curlft.bytes = ltime->bytes; 302 x->curlft.packets = ltime->packets; 303 x->curlft.add_time = ltime->add_time; 304 x->curlft.use_time = ltime->use_time; 305 } 306 307 if (et) { 308 if (RTA_PAYLOAD(et) < sizeof(u32)) 309 goto error; 310 x->replay_maxage = *(u32*)RTA_DATA(et); 311 } 312 313 if (rt) { 314 if (RTA_PAYLOAD(rt) < sizeof(u32)) 315 goto error; 316 x->replay_maxdiff = *(u32*)RTA_DATA(rt); 317 } 318 319 return 0; 320 error: 321 return err; 322 } 323 324 static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p, 325 struct rtattr **xfrma, 326 int *errp) 327 { 328 struct xfrm_state *x = xfrm_state_alloc(); 329 int err = -ENOMEM; 330 331 if (!x) 332 goto error_no_put; 333 334 copy_from_user_state(x, p); 335 336 if ((err = attach_one_algo(&x->aalg, &x->props.aalgo, 337 xfrm_aalg_get_byname, 338 xfrma[XFRMA_ALG_AUTH-1]))) 339 goto error; 340 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo, 341 xfrm_ealg_get_byname, 342 xfrma[XFRMA_ALG_CRYPT-1]))) 343 goto error; 344 if ((err = attach_one_algo(&x->calg, &x->props.calgo, 345 xfrm_calg_get_byname, 346 xfrma[XFRMA_ALG_COMP-1]))) 347 goto error; 348 if ((err = attach_encap_tmpl(&x->encap, xfrma[XFRMA_ENCAP-1]))) 349 goto error; 350 351 err = xfrm_init_state(x); 352 if (err) 353 goto error; 354 355 if ((err = attach_sec_ctx(x, xfrma[XFRMA_SEC_CTX-1]))) 356 goto error; 357 358 x->km.seq = p->seq; 359 x->replay_maxdiff = sysctl_xfrm_aevent_rseqth; 360 /* sysctl_xfrm_aevent_etime is in 100ms units */ 361 x->replay_maxage = (sysctl_xfrm_aevent_etime*HZ)/XFRM_AE_ETH_M; 362 x->preplay.bitmap = 0; 363 x->preplay.seq = x->replay.seq+x->replay_maxdiff; 364 x->preplay.oseq = x->replay.oseq +x->replay_maxdiff; 365 366 /* override default values from above */ 367 368 err = xfrm_update_ae_params(x, (struct rtattr **)xfrma); 369 if (err < 0) 370 goto error; 371 372 return x; 373 374 error: 375 x->km.state = XFRM_STATE_DEAD; 376 xfrm_state_put(x); 377 error_no_put: 378 *errp = err; 379 return NULL; 380 } 381 382 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) 383 { 384 struct xfrm_usersa_info *p = NLMSG_DATA(nlh); 385 struct xfrm_state *x; 386 int err; 387 struct km_event c; 388 389 err = verify_newsa_info(p, (struct rtattr **)xfrma); 390 if (err) 391 return err; 392 393 x = xfrm_state_construct(p, (struct rtattr **)xfrma, &err); 394 if (!x) 395 return err; 396 397 xfrm_state_hold(x); 398 if (nlh->nlmsg_type == XFRM_MSG_NEWSA) 399 err = xfrm_state_add(x); 400 else 401 err = xfrm_state_update(x); 402 403 if (err < 0) { 404 x->km.state = XFRM_STATE_DEAD; 405 __xfrm_state_put(x); 406 goto out; 407 } 408 409 c.seq = nlh->nlmsg_seq; 410 c.pid = nlh->nlmsg_pid; 411 c.event = nlh->nlmsg_type; 412 413 km_state_notify(x, &c); 414 out: 415 xfrm_state_put(x); 416 return err; 417 } 418 419 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) 420 { 421 struct xfrm_state *x; 422 int err; 423 struct km_event c; 424 struct xfrm_usersa_id *p = NLMSG_DATA(nlh); 425 426 x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family); 427 if (x == NULL) 428 return -ESRCH; 429 430 if ((err = security_xfrm_state_delete(x)) != 0) 431 goto out; 432 433 if (xfrm_state_kern(x)) { 434 err = -EPERM; 435 goto out; 436 } 437 438 err = xfrm_state_delete(x); 439 if (err < 0) 440 goto out; 441 442 c.seq = nlh->nlmsg_seq; 443 c.pid = nlh->nlmsg_pid; 444 c.event = nlh->nlmsg_type; 445 km_state_notify(x, &c); 446 447 out: 448 xfrm_state_put(x); 449 return err; 450 } 451 452 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 453 { 454 memcpy(&p->id, &x->id, sizeof(p->id)); 455 memcpy(&p->sel, &x->sel, sizeof(p->sel)); 456 memcpy(&p->lft, &x->lft, sizeof(p->lft)); 457 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft)); 458 memcpy(&p->stats, &x->stats, sizeof(p->stats)); 459 p->saddr = x->props.saddr; 460 p->mode = x->props.mode; 461 p->replay_window = x->props.replay_window; 462 p->reqid = x->props.reqid; 463 p->family = x->props.family; 464 p->flags = x->props.flags; 465 p->seq = x->km.seq; 466 } 467 468 struct xfrm_dump_info { 469 struct sk_buff *in_skb; 470 struct sk_buff *out_skb; 471 u32 nlmsg_seq; 472 u16 nlmsg_flags; 473 int start_idx; 474 int this_idx; 475 }; 476 477 static int dump_one_state(struct xfrm_state *x, int count, void *ptr) 478 { 479 struct xfrm_dump_info *sp = ptr; 480 struct sk_buff *in_skb = sp->in_skb; 481 struct sk_buff *skb = sp->out_skb; 482 struct xfrm_usersa_info *p; 483 struct nlmsghdr *nlh; 484 unsigned char *b = skb->tail; 485 486 if (sp->this_idx < sp->start_idx) 487 goto out; 488 489 nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid, 490 sp->nlmsg_seq, 491 XFRM_MSG_NEWSA, sizeof(*p)); 492 nlh->nlmsg_flags = sp->nlmsg_flags; 493 494 p = NLMSG_DATA(nlh); 495 copy_to_user_state(x, p); 496 497 if (x->aalg) 498 RTA_PUT(skb, XFRMA_ALG_AUTH, 499 sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg); 500 if (x->ealg) 501 RTA_PUT(skb, XFRMA_ALG_CRYPT, 502 sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg); 503 if (x->calg) 504 RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg); 505 506 if (x->encap) 507 RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap); 508 509 if (x->security) { 510 int ctx_size = sizeof(struct xfrm_sec_ctx) + 511 x->security->ctx_len; 512 struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size); 513 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt); 514 515 uctx->exttype = XFRMA_SEC_CTX; 516 uctx->len = ctx_size; 517 uctx->ctx_doi = x->security->ctx_doi; 518 uctx->ctx_alg = x->security->ctx_alg; 519 uctx->ctx_len = x->security->ctx_len; 520 memcpy(uctx + 1, x->security->ctx_str, x->security->ctx_len); 521 } 522 nlh->nlmsg_len = skb->tail - b; 523 out: 524 sp->this_idx++; 525 return 0; 526 527 nlmsg_failure: 528 rtattr_failure: 529 skb_trim(skb, b - skb->data); 530 return -1; 531 } 532 533 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb) 534 { 535 struct xfrm_dump_info info; 536 537 info.in_skb = cb->skb; 538 info.out_skb = skb; 539 info.nlmsg_seq = cb->nlh->nlmsg_seq; 540 info.nlmsg_flags = NLM_F_MULTI; 541 info.this_idx = 0; 542 info.start_idx = cb->args[0]; 543 (void) xfrm_state_walk(IPSEC_PROTO_ANY, dump_one_state, &info); 544 cb->args[0] = info.this_idx; 545 546 return skb->len; 547 } 548 549 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb, 550 struct xfrm_state *x, u32 seq) 551 { 552 struct xfrm_dump_info info; 553 struct sk_buff *skb; 554 555 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); 556 if (!skb) 557 return ERR_PTR(-ENOMEM); 558 559 NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid; 560 info.in_skb = in_skb; 561 info.out_skb = skb; 562 info.nlmsg_seq = seq; 563 info.nlmsg_flags = 0; 564 info.this_idx = info.start_idx = 0; 565 566 if (dump_one_state(x, 0, &info)) { 567 kfree_skb(skb); 568 return NULL; 569 } 570 571 return skb; 572 } 573 574 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) 575 { 576 struct xfrm_usersa_id *p = NLMSG_DATA(nlh); 577 struct xfrm_state *x; 578 struct sk_buff *resp_skb; 579 int err; 580 581 x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family); 582 err = -ESRCH; 583 if (x == NULL) 584 goto out_noput; 585 586 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 587 if (IS_ERR(resp_skb)) { 588 err = PTR_ERR(resp_skb); 589 } else { 590 err = netlink_unicast(xfrm_nl, resp_skb, 591 NETLINK_CB(skb).pid, MSG_DONTWAIT); 592 } 593 xfrm_state_put(x); 594 out_noput: 595 return err; 596 } 597 598 static int verify_userspi_info(struct xfrm_userspi_info *p) 599 { 600 switch (p->info.id.proto) { 601 case IPPROTO_AH: 602 case IPPROTO_ESP: 603 break; 604 605 case IPPROTO_COMP: 606 /* IPCOMP spi is 16-bits. */ 607 if (p->max >= 0x10000) 608 return -EINVAL; 609 break; 610 611 default: 612 return -EINVAL; 613 }; 614 615 if (p->min > p->max) 616 return -EINVAL; 617 618 return 0; 619 } 620 621 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) 622 { 623 struct xfrm_state *x; 624 struct xfrm_userspi_info *p; 625 struct sk_buff *resp_skb; 626 xfrm_address_t *daddr; 627 int family; 628 int err; 629 630 p = NLMSG_DATA(nlh); 631 err = verify_userspi_info(p); 632 if (err) 633 goto out_noput; 634 635 family = p->info.family; 636 daddr = &p->info.id.daddr; 637 638 x = NULL; 639 if (p->info.seq) { 640 x = xfrm_find_acq_byseq(p->info.seq); 641 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) { 642 xfrm_state_put(x); 643 x = NULL; 644 } 645 } 646 647 if (!x) 648 x = xfrm_find_acq(p->info.mode, p->info.reqid, 649 p->info.id.proto, daddr, 650 &p->info.saddr, 1, 651 family); 652 err = -ENOENT; 653 if (x == NULL) 654 goto out_noput; 655 656 resp_skb = ERR_PTR(-ENOENT); 657 658 spin_lock_bh(&x->lock); 659 if (x->km.state != XFRM_STATE_DEAD) { 660 xfrm_alloc_spi(x, htonl(p->min), htonl(p->max)); 661 if (x->id.spi) 662 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 663 } 664 spin_unlock_bh(&x->lock); 665 666 if (IS_ERR(resp_skb)) { 667 err = PTR_ERR(resp_skb); 668 goto out; 669 } 670 671 err = netlink_unicast(xfrm_nl, resp_skb, 672 NETLINK_CB(skb).pid, MSG_DONTWAIT); 673 674 out: 675 xfrm_state_put(x); 676 out_noput: 677 return err; 678 } 679 680 static int verify_policy_dir(__u8 dir) 681 { 682 switch (dir) { 683 case XFRM_POLICY_IN: 684 case XFRM_POLICY_OUT: 685 case XFRM_POLICY_FWD: 686 break; 687 688 default: 689 return -EINVAL; 690 }; 691 692 return 0; 693 } 694 695 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p) 696 { 697 switch (p->share) { 698 case XFRM_SHARE_ANY: 699 case XFRM_SHARE_SESSION: 700 case XFRM_SHARE_USER: 701 case XFRM_SHARE_UNIQUE: 702 break; 703 704 default: 705 return -EINVAL; 706 }; 707 708 switch (p->action) { 709 case XFRM_POLICY_ALLOW: 710 case XFRM_POLICY_BLOCK: 711 break; 712 713 default: 714 return -EINVAL; 715 }; 716 717 switch (p->sel.family) { 718 case AF_INET: 719 break; 720 721 case AF_INET6: 722 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 723 break; 724 #else 725 return -EAFNOSUPPORT; 726 #endif 727 728 default: 729 return -EINVAL; 730 }; 731 732 return verify_policy_dir(p->dir); 733 } 734 735 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct rtattr **xfrma) 736 { 737 struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1]; 738 struct xfrm_user_sec_ctx *uctx; 739 740 if (!rt) 741 return 0; 742 743 uctx = RTA_DATA(rt); 744 return security_xfrm_policy_alloc(pol, uctx); 745 } 746 747 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut, 748 int nr) 749 { 750 int i; 751 752 xp->xfrm_nr = nr; 753 for (i = 0; i < nr; i++, ut++) { 754 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 755 756 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id)); 757 memcpy(&t->saddr, &ut->saddr, 758 sizeof(xfrm_address_t)); 759 t->reqid = ut->reqid; 760 t->mode = ut->mode; 761 t->share = ut->share; 762 t->optional = ut->optional; 763 t->aalgos = ut->aalgos; 764 t->ealgos = ut->ealgos; 765 t->calgos = ut->calgos; 766 } 767 } 768 769 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct rtattr **xfrma) 770 { 771 struct rtattr *rt = xfrma[XFRMA_TMPL-1]; 772 struct xfrm_user_tmpl *utmpl; 773 int nr; 774 775 if (!rt) { 776 pol->xfrm_nr = 0; 777 } else { 778 nr = (rt->rta_len - sizeof(*rt)) / sizeof(*utmpl); 779 780 if (nr > XFRM_MAX_DEPTH) 781 return -EINVAL; 782 783 copy_templates(pol, RTA_DATA(rt), nr); 784 } 785 return 0; 786 } 787 788 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p) 789 { 790 xp->priority = p->priority; 791 xp->index = p->index; 792 memcpy(&xp->selector, &p->sel, sizeof(xp->selector)); 793 memcpy(&xp->lft, &p->lft, sizeof(xp->lft)); 794 xp->action = p->action; 795 xp->flags = p->flags; 796 xp->family = p->sel.family; 797 /* XXX xp->share = p->share; */ 798 } 799 800 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir) 801 { 802 memcpy(&p->sel, &xp->selector, sizeof(p->sel)); 803 memcpy(&p->lft, &xp->lft, sizeof(p->lft)); 804 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft)); 805 p->priority = xp->priority; 806 p->index = xp->index; 807 p->sel.family = xp->family; 808 p->dir = dir; 809 p->action = xp->action; 810 p->flags = xp->flags; 811 p->share = XFRM_SHARE_ANY; /* XXX xp->share */ 812 } 813 814 static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p, struct rtattr **xfrma, int *errp) 815 { 816 struct xfrm_policy *xp = xfrm_policy_alloc(GFP_KERNEL); 817 int err; 818 819 if (!xp) { 820 *errp = -ENOMEM; 821 return NULL; 822 } 823 824 copy_from_user_policy(xp, p); 825 826 if (!(err = copy_from_user_tmpl(xp, xfrma))) 827 err = copy_from_user_sec_ctx(xp, xfrma); 828 829 if (err) { 830 *errp = err; 831 kfree(xp); 832 xp = NULL; 833 } 834 835 return xp; 836 } 837 838 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) 839 { 840 struct xfrm_userpolicy_info *p = NLMSG_DATA(nlh); 841 struct xfrm_policy *xp; 842 struct km_event c; 843 int err; 844 int excl; 845 846 err = verify_newpolicy_info(p); 847 if (err) 848 return err; 849 err = verify_sec_ctx_len((struct rtattr **)xfrma); 850 if (err) 851 return err; 852 853 xp = xfrm_policy_construct(p, (struct rtattr **)xfrma, &err); 854 if (!xp) 855 return err; 856 857 /* shouldnt excl be based on nlh flags?? 858 * Aha! this is anti-netlink really i.e more pfkey derived 859 * in netlink excl is a flag and you wouldnt need 860 * a type XFRM_MSG_UPDPOLICY - JHS */ 861 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY; 862 err = xfrm_policy_insert(p->dir, xp, excl); 863 if (err) { 864 security_xfrm_policy_free(xp); 865 kfree(xp); 866 return err; 867 } 868 869 c.event = nlh->nlmsg_type; 870 c.seq = nlh->nlmsg_seq; 871 c.pid = nlh->nlmsg_pid; 872 km_policy_notify(xp, p->dir, &c); 873 874 xfrm_pol_put(xp); 875 876 return 0; 877 } 878 879 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb) 880 { 881 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH]; 882 int i; 883 884 if (xp->xfrm_nr == 0) 885 return 0; 886 887 for (i = 0; i < xp->xfrm_nr; i++) { 888 struct xfrm_user_tmpl *up = &vec[i]; 889 struct xfrm_tmpl *kp = &xp->xfrm_vec[i]; 890 891 memcpy(&up->id, &kp->id, sizeof(up->id)); 892 up->family = xp->family; 893 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr)); 894 up->reqid = kp->reqid; 895 up->mode = kp->mode; 896 up->share = kp->share; 897 up->optional = kp->optional; 898 up->aalgos = kp->aalgos; 899 up->ealgos = kp->ealgos; 900 up->calgos = kp->calgos; 901 } 902 RTA_PUT(skb, XFRMA_TMPL, 903 (sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr), 904 vec); 905 906 return 0; 907 908 rtattr_failure: 909 return -1; 910 } 911 912 static int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb) 913 { 914 if (xp->security) { 915 int ctx_size = sizeof(struct xfrm_sec_ctx) + 916 xp->security->ctx_len; 917 struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size); 918 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt); 919 920 uctx->exttype = XFRMA_SEC_CTX; 921 uctx->len = ctx_size; 922 uctx->ctx_doi = xp->security->ctx_doi; 923 uctx->ctx_alg = xp->security->ctx_alg; 924 uctx->ctx_len = xp->security->ctx_len; 925 memcpy(uctx + 1, xp->security->ctx_str, xp->security->ctx_len); 926 } 927 return 0; 928 929 rtattr_failure: 930 return -1; 931 } 932 933 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr) 934 { 935 struct xfrm_dump_info *sp = ptr; 936 struct xfrm_userpolicy_info *p; 937 struct sk_buff *in_skb = sp->in_skb; 938 struct sk_buff *skb = sp->out_skb; 939 struct nlmsghdr *nlh; 940 unsigned char *b = skb->tail; 941 942 if (sp->this_idx < sp->start_idx) 943 goto out; 944 945 nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid, 946 sp->nlmsg_seq, 947 XFRM_MSG_NEWPOLICY, sizeof(*p)); 948 p = NLMSG_DATA(nlh); 949 nlh->nlmsg_flags = sp->nlmsg_flags; 950 951 copy_to_user_policy(xp, p, dir); 952 if (copy_to_user_tmpl(xp, skb) < 0) 953 goto nlmsg_failure; 954 if (copy_to_user_sec_ctx(xp, skb)) 955 goto nlmsg_failure; 956 957 nlh->nlmsg_len = skb->tail - b; 958 out: 959 sp->this_idx++; 960 return 0; 961 962 nlmsg_failure: 963 skb_trim(skb, b - skb->data); 964 return -1; 965 } 966 967 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb) 968 { 969 struct xfrm_dump_info info; 970 971 info.in_skb = cb->skb; 972 info.out_skb = skb; 973 info.nlmsg_seq = cb->nlh->nlmsg_seq; 974 info.nlmsg_flags = NLM_F_MULTI; 975 info.this_idx = 0; 976 info.start_idx = cb->args[0]; 977 (void) xfrm_policy_walk(dump_one_policy, &info); 978 cb->args[0] = info.this_idx; 979 980 return skb->len; 981 } 982 983 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb, 984 struct xfrm_policy *xp, 985 int dir, u32 seq) 986 { 987 struct xfrm_dump_info info; 988 struct sk_buff *skb; 989 990 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); 991 if (!skb) 992 return ERR_PTR(-ENOMEM); 993 994 NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid; 995 info.in_skb = in_skb; 996 info.out_skb = skb; 997 info.nlmsg_seq = seq; 998 info.nlmsg_flags = 0; 999 info.this_idx = info.start_idx = 0; 1000 1001 if (dump_one_policy(xp, dir, 0, &info) < 0) { 1002 kfree_skb(skb); 1003 return NULL; 1004 } 1005 1006 return skb; 1007 } 1008 1009 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) 1010 { 1011 struct xfrm_policy *xp; 1012 struct xfrm_userpolicy_id *p; 1013 int err; 1014 struct km_event c; 1015 int delete; 1016 1017 p = NLMSG_DATA(nlh); 1018 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY; 1019 1020 err = verify_policy_dir(p->dir); 1021 if (err) 1022 return err; 1023 1024 if (p->index) 1025 xp = xfrm_policy_byid(p->dir, p->index, delete); 1026 else { 1027 struct rtattr **rtattrs = (struct rtattr **)xfrma; 1028 struct rtattr *rt = rtattrs[XFRMA_SEC_CTX-1]; 1029 struct xfrm_policy tmp; 1030 1031 err = verify_sec_ctx_len(rtattrs); 1032 if (err) 1033 return err; 1034 1035 memset(&tmp, 0, sizeof(struct xfrm_policy)); 1036 if (rt) { 1037 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt); 1038 1039 if ((err = security_xfrm_policy_alloc(&tmp, uctx))) 1040 return err; 1041 } 1042 xp = xfrm_policy_bysel_ctx(p->dir, &p->sel, tmp.security, delete); 1043 security_xfrm_policy_free(&tmp); 1044 } 1045 if (xp == NULL) 1046 return -ENOENT; 1047 1048 if (!delete) { 1049 struct sk_buff *resp_skb; 1050 1051 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq); 1052 if (IS_ERR(resp_skb)) { 1053 err = PTR_ERR(resp_skb); 1054 } else { 1055 err = netlink_unicast(xfrm_nl, resp_skb, 1056 NETLINK_CB(skb).pid, 1057 MSG_DONTWAIT); 1058 } 1059 } else { 1060 if ((err = security_xfrm_policy_delete(xp)) != 0) 1061 goto out; 1062 c.data.byid = p->index; 1063 c.event = nlh->nlmsg_type; 1064 c.seq = nlh->nlmsg_seq; 1065 c.pid = nlh->nlmsg_pid; 1066 km_policy_notify(xp, p->dir, &c); 1067 } 1068 1069 xfrm_pol_put(xp); 1070 1071 out: 1072 return err; 1073 } 1074 1075 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) 1076 { 1077 struct km_event c; 1078 struct xfrm_usersa_flush *p = NLMSG_DATA(nlh); 1079 1080 xfrm_state_flush(p->proto); 1081 c.data.proto = p->proto; 1082 c.event = nlh->nlmsg_type; 1083 c.seq = nlh->nlmsg_seq; 1084 c.pid = nlh->nlmsg_pid; 1085 km_state_notify(NULL, &c); 1086 1087 return 0; 1088 } 1089 1090 1091 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c) 1092 { 1093 struct xfrm_aevent_id *id; 1094 struct nlmsghdr *nlh; 1095 struct xfrm_lifetime_cur ltime; 1096 unsigned char *b = skb->tail; 1097 1098 nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id)); 1099 id = NLMSG_DATA(nlh); 1100 nlh->nlmsg_flags = 0; 1101 1102 id->sa_id.daddr = x->id.daddr; 1103 id->sa_id.spi = x->id.spi; 1104 id->sa_id.family = x->props.family; 1105 id->sa_id.proto = x->id.proto; 1106 id->flags = c->data.aevent; 1107 1108 RTA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay); 1109 1110 ltime.bytes = x->curlft.bytes; 1111 ltime.packets = x->curlft.packets; 1112 ltime.add_time = x->curlft.add_time; 1113 ltime.use_time = x->curlft.use_time; 1114 1115 RTA_PUT(skb, XFRMA_LTIME_VAL, sizeof(struct xfrm_lifetime_cur), <ime); 1116 1117 if (id->flags&XFRM_AE_RTHR) { 1118 RTA_PUT(skb,XFRMA_REPLAY_THRESH,sizeof(u32),&x->replay_maxdiff); 1119 } 1120 1121 if (id->flags&XFRM_AE_ETHR) { 1122 u32 etimer = x->replay_maxage*10/HZ; 1123 RTA_PUT(skb,XFRMA_ETIMER_THRESH,sizeof(u32),&etimer); 1124 } 1125 1126 nlh->nlmsg_len = skb->tail - b; 1127 return skb->len; 1128 1129 rtattr_failure: 1130 nlmsg_failure: 1131 skb_trim(skb, b - skb->data); 1132 return -1; 1133 } 1134 1135 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) 1136 { 1137 struct xfrm_state *x; 1138 struct sk_buff *r_skb; 1139 int err; 1140 struct km_event c; 1141 struct xfrm_aevent_id *p = NLMSG_DATA(nlh); 1142 int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id)); 1143 struct xfrm_usersa_id *id = &p->sa_id; 1144 1145 len += RTA_SPACE(sizeof(struct xfrm_replay_state)); 1146 len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur)); 1147 1148 if (p->flags&XFRM_AE_RTHR) 1149 len+=RTA_SPACE(sizeof(u32)); 1150 1151 if (p->flags&XFRM_AE_ETHR) 1152 len+=RTA_SPACE(sizeof(u32)); 1153 1154 r_skb = alloc_skb(len, GFP_ATOMIC); 1155 if (r_skb == NULL) 1156 return -ENOMEM; 1157 1158 x = xfrm_state_lookup(&id->daddr, id->spi, id->proto, id->family); 1159 if (x == NULL) { 1160 kfree(r_skb); 1161 return -ESRCH; 1162 } 1163 1164 /* 1165 * XXX: is this lock really needed - none of the other 1166 * gets lock (the concern is things getting updated 1167 * while we are still reading) - jhs 1168 */ 1169 spin_lock_bh(&x->lock); 1170 c.data.aevent = p->flags; 1171 c.seq = nlh->nlmsg_seq; 1172 c.pid = nlh->nlmsg_pid; 1173 1174 if (build_aevent(r_skb, x, &c) < 0) 1175 BUG(); 1176 err = netlink_unicast(xfrm_nl, r_skb, 1177 NETLINK_CB(skb).pid, MSG_DONTWAIT); 1178 spin_unlock_bh(&x->lock); 1179 xfrm_state_put(x); 1180 return err; 1181 } 1182 1183 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) 1184 { 1185 struct xfrm_state *x; 1186 struct km_event c; 1187 int err = - EINVAL; 1188 struct xfrm_aevent_id *p = NLMSG_DATA(nlh); 1189 struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1]; 1190 struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1]; 1191 1192 if (!lt && !rp) 1193 return err; 1194 1195 /* pedantic mode - thou shalt sayeth replaceth */ 1196 if (!(nlh->nlmsg_flags&NLM_F_REPLACE)) 1197 return err; 1198 1199 x = xfrm_state_lookup(&p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family); 1200 if (x == NULL) 1201 return -ESRCH; 1202 1203 if (x->km.state != XFRM_STATE_VALID) 1204 goto out; 1205 1206 spin_lock_bh(&x->lock); 1207 err = xfrm_update_ae_params(x,(struct rtattr **)xfrma); 1208 spin_unlock_bh(&x->lock); 1209 if (err < 0) 1210 goto out; 1211 1212 c.event = nlh->nlmsg_type; 1213 c.seq = nlh->nlmsg_seq; 1214 c.pid = nlh->nlmsg_pid; 1215 c.data.aevent = XFRM_AE_CU; 1216 km_state_notify(x, &c); 1217 err = 0; 1218 out: 1219 xfrm_state_put(x); 1220 return err; 1221 } 1222 1223 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) 1224 { 1225 struct km_event c; 1226 1227 xfrm_policy_flush(); 1228 c.event = nlh->nlmsg_type; 1229 c.seq = nlh->nlmsg_seq; 1230 c.pid = nlh->nlmsg_pid; 1231 km_policy_notify(NULL, 0, &c); 1232 return 0; 1233 } 1234 1235 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) 1236 { 1237 struct xfrm_policy *xp; 1238 struct xfrm_user_polexpire *up = NLMSG_DATA(nlh); 1239 struct xfrm_userpolicy_info *p = &up->pol; 1240 int err = -ENOENT; 1241 1242 if (p->index) 1243 xp = xfrm_policy_byid(p->dir, p->index, 0); 1244 else { 1245 struct rtattr **rtattrs = (struct rtattr **)xfrma; 1246 struct rtattr *rt = rtattrs[XFRMA_SEC_CTX-1]; 1247 struct xfrm_policy tmp; 1248 1249 err = verify_sec_ctx_len(rtattrs); 1250 if (err) 1251 return err; 1252 1253 memset(&tmp, 0, sizeof(struct xfrm_policy)); 1254 if (rt) { 1255 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt); 1256 1257 if ((err = security_xfrm_policy_alloc(&tmp, uctx))) 1258 return err; 1259 } 1260 xp = xfrm_policy_bysel_ctx(p->dir, &p->sel, tmp.security, 0); 1261 security_xfrm_policy_free(&tmp); 1262 } 1263 1264 if (xp == NULL) 1265 return err; 1266 read_lock(&xp->lock); 1267 if (xp->dead) { 1268 read_unlock(&xp->lock); 1269 goto out; 1270 } 1271 1272 read_unlock(&xp->lock); 1273 err = 0; 1274 if (up->hard) { 1275 xfrm_policy_delete(xp, p->dir); 1276 } else { 1277 // reset the timers here? 1278 printk("Dont know what to do with soft policy expire\n"); 1279 } 1280 km_policy_expired(xp, p->dir, up->hard, current->pid); 1281 1282 out: 1283 xfrm_pol_put(xp); 1284 return err; 1285 } 1286 1287 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) 1288 { 1289 struct xfrm_state *x; 1290 int err; 1291 struct xfrm_user_expire *ue = NLMSG_DATA(nlh); 1292 struct xfrm_usersa_info *p = &ue->state; 1293 1294 x = xfrm_state_lookup(&p->id.daddr, p->id.spi, p->id.proto, p->family); 1295 err = -ENOENT; 1296 1297 if (x == NULL) 1298 return err; 1299 1300 err = -EINVAL; 1301 1302 spin_lock_bh(&x->lock); 1303 if (x->km.state != XFRM_STATE_VALID) 1304 goto out; 1305 km_state_expired(x, ue->hard, current->pid); 1306 1307 if (ue->hard) 1308 __xfrm_state_delete(x); 1309 out: 1310 spin_unlock_bh(&x->lock); 1311 xfrm_state_put(x); 1312 return err; 1313 } 1314 1315 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma) 1316 { 1317 struct xfrm_policy *xp; 1318 struct xfrm_user_tmpl *ut; 1319 int i; 1320 struct rtattr *rt = xfrma[XFRMA_TMPL-1]; 1321 1322 struct xfrm_user_acquire *ua = NLMSG_DATA(nlh); 1323 struct xfrm_state *x = xfrm_state_alloc(); 1324 int err = -ENOMEM; 1325 1326 if (!x) 1327 return err; 1328 1329 err = verify_newpolicy_info(&ua->policy); 1330 if (err) { 1331 printk("BAD policy passed\n"); 1332 kfree(x); 1333 return err; 1334 } 1335 1336 /* build an XP */ 1337 xp = xfrm_policy_construct(&ua->policy, (struct rtattr **) xfrma, &err); if (!xp) { 1338 kfree(x); 1339 return err; 1340 } 1341 1342 memcpy(&x->id, &ua->id, sizeof(ua->id)); 1343 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr)); 1344 memcpy(&x->sel, &ua->sel, sizeof(ua->sel)); 1345 1346 ut = RTA_DATA(rt); 1347 /* extract the templates and for each call km_key */ 1348 for (i = 0; i < xp->xfrm_nr; i++, ut++) { 1349 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 1350 memcpy(&x->id, &t->id, sizeof(x->id)); 1351 x->props.mode = t->mode; 1352 x->props.reqid = t->reqid; 1353 x->props.family = ut->family; 1354 t->aalgos = ua->aalgos; 1355 t->ealgos = ua->ealgos; 1356 t->calgos = ua->calgos; 1357 err = km_query(x, t, xp); 1358 1359 } 1360 1361 kfree(x); 1362 kfree(xp); 1363 1364 return 0; 1365 } 1366 1367 1368 #define XMSGSIZE(type) NLMSG_LENGTH(sizeof(struct type)) 1369 1370 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = { 1371 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 1372 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 1373 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 1374 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 1375 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 1376 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 1377 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info), 1378 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire), 1379 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire), 1380 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 1381 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 1382 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire), 1383 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush), 1384 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = NLMSG_LENGTH(0), 1385 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 1386 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 1387 }; 1388 1389 #undef XMSGSIZE 1390 1391 static struct xfrm_link { 1392 int (*doit)(struct sk_buff *, struct nlmsghdr *, void **); 1393 int (*dump)(struct sk_buff *, struct netlink_callback *); 1394 } xfrm_dispatch[XFRM_NR_MSGTYPES] = { 1395 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 1396 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa }, 1397 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa, 1398 .dump = xfrm_dump_sa }, 1399 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 1400 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy }, 1401 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy, 1402 .dump = xfrm_dump_policy }, 1403 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi }, 1404 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire }, 1405 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire }, 1406 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 1407 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 1408 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire}, 1409 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa }, 1410 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy }, 1411 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae }, 1412 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae }, 1413 }; 1414 1415 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp) 1416 { 1417 struct rtattr *xfrma[XFRMA_MAX]; 1418 struct xfrm_link *link; 1419 int type, min_len; 1420 1421 if (!(nlh->nlmsg_flags & NLM_F_REQUEST)) 1422 return 0; 1423 1424 type = nlh->nlmsg_type; 1425 1426 /* A control message: ignore them */ 1427 if (type < XFRM_MSG_BASE) 1428 return 0; 1429 1430 /* Unknown message: reply with EINVAL */ 1431 if (type > XFRM_MSG_MAX) 1432 goto err_einval; 1433 1434 type -= XFRM_MSG_BASE; 1435 link = &xfrm_dispatch[type]; 1436 1437 /* All operations require privileges, even GET */ 1438 if (security_netlink_recv(skb, CAP_NET_ADMIN)) { 1439 *errp = -EPERM; 1440 return -1; 1441 } 1442 1443 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) || 1444 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) && 1445 (nlh->nlmsg_flags & NLM_F_DUMP)) { 1446 if (link->dump == NULL) 1447 goto err_einval; 1448 1449 if ((*errp = netlink_dump_start(xfrm_nl, skb, nlh, 1450 link->dump, NULL)) != 0) { 1451 return -1; 1452 } 1453 1454 netlink_queue_skip(nlh, skb); 1455 return -1; 1456 } 1457 1458 memset(xfrma, 0, sizeof(xfrma)); 1459 1460 if (nlh->nlmsg_len < (min_len = xfrm_msg_min[type])) 1461 goto err_einval; 1462 1463 if (nlh->nlmsg_len > min_len) { 1464 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); 1465 struct rtattr *attr = (void *) nlh + NLMSG_ALIGN(min_len); 1466 1467 while (RTA_OK(attr, attrlen)) { 1468 unsigned short flavor = attr->rta_type; 1469 if (flavor) { 1470 if (flavor > XFRMA_MAX) 1471 goto err_einval; 1472 xfrma[flavor - 1] = attr; 1473 } 1474 attr = RTA_NEXT(attr, attrlen); 1475 } 1476 } 1477 1478 if (link->doit == NULL) 1479 goto err_einval; 1480 *errp = link->doit(skb, nlh, (void **) &xfrma); 1481 1482 return *errp; 1483 1484 err_einval: 1485 *errp = -EINVAL; 1486 return -1; 1487 } 1488 1489 static void xfrm_netlink_rcv(struct sock *sk, int len) 1490 { 1491 unsigned int qlen = 0; 1492 1493 do { 1494 mutex_lock(&xfrm_cfg_mutex); 1495 netlink_run_queue(sk, &qlen, &xfrm_user_rcv_msg); 1496 mutex_unlock(&xfrm_cfg_mutex); 1497 1498 } while (qlen); 1499 } 1500 1501 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c) 1502 { 1503 struct xfrm_user_expire *ue; 1504 struct nlmsghdr *nlh; 1505 unsigned char *b = skb->tail; 1506 1507 nlh = NLMSG_PUT(skb, c->pid, 0, XFRM_MSG_EXPIRE, 1508 sizeof(*ue)); 1509 ue = NLMSG_DATA(nlh); 1510 nlh->nlmsg_flags = 0; 1511 1512 copy_to_user_state(x, &ue->state); 1513 ue->hard = (c->data.hard != 0) ? 1 : 0; 1514 1515 nlh->nlmsg_len = skb->tail - b; 1516 return skb->len; 1517 1518 nlmsg_failure: 1519 skb_trim(skb, b - skb->data); 1520 return -1; 1521 } 1522 1523 static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c) 1524 { 1525 struct sk_buff *skb; 1526 int len = NLMSG_LENGTH(sizeof(struct xfrm_user_expire)); 1527 1528 skb = alloc_skb(len, GFP_ATOMIC); 1529 if (skb == NULL) 1530 return -ENOMEM; 1531 1532 if (build_expire(skb, x, c) < 0) 1533 BUG(); 1534 1535 NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE; 1536 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC); 1537 } 1538 1539 static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c) 1540 { 1541 struct sk_buff *skb; 1542 int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id)); 1543 1544 len += RTA_SPACE(sizeof(struct xfrm_replay_state)); 1545 len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur)); 1546 skb = alloc_skb(len, GFP_ATOMIC); 1547 if (skb == NULL) 1548 return -ENOMEM; 1549 1550 if (build_aevent(skb, x, c) < 0) 1551 BUG(); 1552 1553 NETLINK_CB(skb).dst_group = XFRMNLGRP_AEVENTS; 1554 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC); 1555 } 1556 1557 static int xfrm_notify_sa_flush(struct km_event *c) 1558 { 1559 struct xfrm_usersa_flush *p; 1560 struct nlmsghdr *nlh; 1561 struct sk_buff *skb; 1562 unsigned char *b; 1563 int len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_flush)); 1564 1565 skb = alloc_skb(len, GFP_ATOMIC); 1566 if (skb == NULL) 1567 return -ENOMEM; 1568 b = skb->tail; 1569 1570 nlh = NLMSG_PUT(skb, c->pid, c->seq, 1571 XFRM_MSG_FLUSHSA, sizeof(*p)); 1572 nlh->nlmsg_flags = 0; 1573 1574 p = NLMSG_DATA(nlh); 1575 p->proto = c->data.proto; 1576 1577 nlh->nlmsg_len = skb->tail - b; 1578 1579 NETLINK_CB(skb).dst_group = XFRMNLGRP_SA; 1580 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC); 1581 1582 nlmsg_failure: 1583 kfree_skb(skb); 1584 return -1; 1585 } 1586 1587 static int inline xfrm_sa_len(struct xfrm_state *x) 1588 { 1589 int l = 0; 1590 if (x->aalg) 1591 l += RTA_SPACE(sizeof(*x->aalg) + (x->aalg->alg_key_len+7)/8); 1592 if (x->ealg) 1593 l += RTA_SPACE(sizeof(*x->ealg) + (x->ealg->alg_key_len+7)/8); 1594 if (x->calg) 1595 l += RTA_SPACE(sizeof(*x->calg)); 1596 if (x->encap) 1597 l += RTA_SPACE(sizeof(*x->encap)); 1598 1599 return l; 1600 } 1601 1602 static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c) 1603 { 1604 struct xfrm_usersa_info *p; 1605 struct xfrm_usersa_id *id; 1606 struct nlmsghdr *nlh; 1607 struct sk_buff *skb; 1608 unsigned char *b; 1609 int len = xfrm_sa_len(x); 1610 int headlen; 1611 1612 headlen = sizeof(*p); 1613 if (c->event == XFRM_MSG_DELSA) { 1614 len += RTA_SPACE(headlen); 1615 headlen = sizeof(*id); 1616 } 1617 len += NLMSG_SPACE(headlen); 1618 1619 skb = alloc_skb(len, GFP_ATOMIC); 1620 if (skb == NULL) 1621 return -ENOMEM; 1622 b = skb->tail; 1623 1624 nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen); 1625 nlh->nlmsg_flags = 0; 1626 1627 p = NLMSG_DATA(nlh); 1628 if (c->event == XFRM_MSG_DELSA) { 1629 id = NLMSG_DATA(nlh); 1630 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr)); 1631 id->spi = x->id.spi; 1632 id->family = x->props.family; 1633 id->proto = x->id.proto; 1634 1635 p = RTA_DATA(__RTA_PUT(skb, XFRMA_SA, sizeof(*p))); 1636 } 1637 1638 copy_to_user_state(x, p); 1639 1640 if (x->aalg) 1641 RTA_PUT(skb, XFRMA_ALG_AUTH, 1642 sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg); 1643 if (x->ealg) 1644 RTA_PUT(skb, XFRMA_ALG_CRYPT, 1645 sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg); 1646 if (x->calg) 1647 RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg); 1648 1649 if (x->encap) 1650 RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap); 1651 1652 nlh->nlmsg_len = skb->tail - b; 1653 1654 NETLINK_CB(skb).dst_group = XFRMNLGRP_SA; 1655 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC); 1656 1657 nlmsg_failure: 1658 rtattr_failure: 1659 kfree_skb(skb); 1660 return -1; 1661 } 1662 1663 static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c) 1664 { 1665 1666 switch (c->event) { 1667 case XFRM_MSG_EXPIRE: 1668 return xfrm_exp_state_notify(x, c); 1669 case XFRM_MSG_NEWAE: 1670 return xfrm_aevent_state_notify(x, c); 1671 case XFRM_MSG_DELSA: 1672 case XFRM_MSG_UPDSA: 1673 case XFRM_MSG_NEWSA: 1674 return xfrm_notify_sa(x, c); 1675 case XFRM_MSG_FLUSHSA: 1676 return xfrm_notify_sa_flush(c); 1677 default: 1678 printk("xfrm_user: Unknown SA event %d\n", c->event); 1679 break; 1680 } 1681 1682 return 0; 1683 1684 } 1685 1686 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x, 1687 struct xfrm_tmpl *xt, struct xfrm_policy *xp, 1688 int dir) 1689 { 1690 struct xfrm_user_acquire *ua; 1691 struct nlmsghdr *nlh; 1692 unsigned char *b = skb->tail; 1693 __u32 seq = xfrm_get_acqseq(); 1694 1695 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_ACQUIRE, 1696 sizeof(*ua)); 1697 ua = NLMSG_DATA(nlh); 1698 nlh->nlmsg_flags = 0; 1699 1700 memcpy(&ua->id, &x->id, sizeof(ua->id)); 1701 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr)); 1702 memcpy(&ua->sel, &x->sel, sizeof(ua->sel)); 1703 copy_to_user_policy(xp, &ua->policy, dir); 1704 ua->aalgos = xt->aalgos; 1705 ua->ealgos = xt->ealgos; 1706 ua->calgos = xt->calgos; 1707 ua->seq = x->km.seq = seq; 1708 1709 if (copy_to_user_tmpl(xp, skb) < 0) 1710 goto nlmsg_failure; 1711 if (copy_to_user_sec_ctx(xp, skb)) 1712 goto nlmsg_failure; 1713 1714 nlh->nlmsg_len = skb->tail - b; 1715 return skb->len; 1716 1717 nlmsg_failure: 1718 skb_trim(skb, b - skb->data); 1719 return -1; 1720 } 1721 1722 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt, 1723 struct xfrm_policy *xp, int dir) 1724 { 1725 struct sk_buff *skb; 1726 size_t len; 1727 1728 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); 1729 len += NLMSG_SPACE(sizeof(struct xfrm_user_acquire)); 1730 len += RTA_SPACE(xfrm_user_sec_ctx_size(xp)); 1731 skb = alloc_skb(len, GFP_ATOMIC); 1732 if (skb == NULL) 1733 return -ENOMEM; 1734 1735 if (build_acquire(skb, x, xt, xp, dir) < 0) 1736 BUG(); 1737 1738 NETLINK_CB(skb).dst_group = XFRMNLGRP_ACQUIRE; 1739 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC); 1740 } 1741 1742 /* User gives us xfrm_user_policy_info followed by an array of 0 1743 * or more templates. 1744 */ 1745 static struct xfrm_policy *xfrm_compile_policy(u16 family, int opt, 1746 u8 *data, int len, int *dir) 1747 { 1748 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data; 1749 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1); 1750 struct xfrm_policy *xp; 1751 int nr; 1752 1753 switch (family) { 1754 case AF_INET: 1755 if (opt != IP_XFRM_POLICY) { 1756 *dir = -EOPNOTSUPP; 1757 return NULL; 1758 } 1759 break; 1760 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1761 case AF_INET6: 1762 if (opt != IPV6_XFRM_POLICY) { 1763 *dir = -EOPNOTSUPP; 1764 return NULL; 1765 } 1766 break; 1767 #endif 1768 default: 1769 *dir = -EINVAL; 1770 return NULL; 1771 } 1772 1773 *dir = -EINVAL; 1774 1775 if (len < sizeof(*p) || 1776 verify_newpolicy_info(p)) 1777 return NULL; 1778 1779 nr = ((len - sizeof(*p)) / sizeof(*ut)); 1780 if (nr > XFRM_MAX_DEPTH) 1781 return NULL; 1782 1783 if (p->dir > XFRM_POLICY_OUT) 1784 return NULL; 1785 1786 xp = xfrm_policy_alloc(GFP_KERNEL); 1787 if (xp == NULL) { 1788 *dir = -ENOBUFS; 1789 return NULL; 1790 } 1791 1792 copy_from_user_policy(xp, p); 1793 copy_templates(xp, ut, nr); 1794 1795 *dir = p->dir; 1796 1797 return xp; 1798 } 1799 1800 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp, 1801 int dir, struct km_event *c) 1802 { 1803 struct xfrm_user_polexpire *upe; 1804 struct nlmsghdr *nlh; 1805 int hard = c->data.hard; 1806 unsigned char *b = skb->tail; 1807 1808 nlh = NLMSG_PUT(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe)); 1809 upe = NLMSG_DATA(nlh); 1810 nlh->nlmsg_flags = 0; 1811 1812 copy_to_user_policy(xp, &upe->pol, dir); 1813 if (copy_to_user_tmpl(xp, skb) < 0) 1814 goto nlmsg_failure; 1815 if (copy_to_user_sec_ctx(xp, skb)) 1816 goto nlmsg_failure; 1817 upe->hard = !!hard; 1818 1819 nlh->nlmsg_len = skb->tail - b; 1820 return skb->len; 1821 1822 nlmsg_failure: 1823 skb_trim(skb, b - skb->data); 1824 return -1; 1825 } 1826 1827 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) 1828 { 1829 struct sk_buff *skb; 1830 size_t len; 1831 1832 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); 1833 len += NLMSG_SPACE(sizeof(struct xfrm_user_polexpire)); 1834 len += RTA_SPACE(xfrm_user_sec_ctx_size(xp)); 1835 skb = alloc_skb(len, GFP_ATOMIC); 1836 if (skb == NULL) 1837 return -ENOMEM; 1838 1839 if (build_polexpire(skb, xp, dir, c) < 0) 1840 BUG(); 1841 1842 NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE; 1843 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC); 1844 } 1845 1846 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c) 1847 { 1848 struct xfrm_userpolicy_info *p; 1849 struct xfrm_userpolicy_id *id; 1850 struct nlmsghdr *nlh; 1851 struct sk_buff *skb; 1852 unsigned char *b; 1853 int len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); 1854 int headlen; 1855 1856 headlen = sizeof(*p); 1857 if (c->event == XFRM_MSG_DELPOLICY) { 1858 len += RTA_SPACE(headlen); 1859 headlen = sizeof(*id); 1860 } 1861 len += NLMSG_SPACE(headlen); 1862 1863 skb = alloc_skb(len, GFP_ATOMIC); 1864 if (skb == NULL) 1865 return -ENOMEM; 1866 b = skb->tail; 1867 1868 nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen); 1869 1870 p = NLMSG_DATA(nlh); 1871 if (c->event == XFRM_MSG_DELPOLICY) { 1872 id = NLMSG_DATA(nlh); 1873 memset(id, 0, sizeof(*id)); 1874 id->dir = dir; 1875 if (c->data.byid) 1876 id->index = xp->index; 1877 else 1878 memcpy(&id->sel, &xp->selector, sizeof(id->sel)); 1879 1880 p = RTA_DATA(__RTA_PUT(skb, XFRMA_POLICY, sizeof(*p))); 1881 } 1882 1883 nlh->nlmsg_flags = 0; 1884 1885 copy_to_user_policy(xp, p, dir); 1886 if (copy_to_user_tmpl(xp, skb) < 0) 1887 goto nlmsg_failure; 1888 1889 nlh->nlmsg_len = skb->tail - b; 1890 1891 NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY; 1892 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC); 1893 1894 nlmsg_failure: 1895 rtattr_failure: 1896 kfree_skb(skb); 1897 return -1; 1898 } 1899 1900 static int xfrm_notify_policy_flush(struct km_event *c) 1901 { 1902 struct nlmsghdr *nlh; 1903 struct sk_buff *skb; 1904 unsigned char *b; 1905 int len = NLMSG_LENGTH(0); 1906 1907 skb = alloc_skb(len, GFP_ATOMIC); 1908 if (skb == NULL) 1909 return -ENOMEM; 1910 b = skb->tail; 1911 1912 1913 nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0); 1914 1915 nlh->nlmsg_len = skb->tail - b; 1916 1917 NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY; 1918 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC); 1919 1920 nlmsg_failure: 1921 kfree_skb(skb); 1922 return -1; 1923 } 1924 1925 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) 1926 { 1927 1928 switch (c->event) { 1929 case XFRM_MSG_NEWPOLICY: 1930 case XFRM_MSG_UPDPOLICY: 1931 case XFRM_MSG_DELPOLICY: 1932 return xfrm_notify_policy(xp, dir, c); 1933 case XFRM_MSG_FLUSHPOLICY: 1934 return xfrm_notify_policy_flush(c); 1935 case XFRM_MSG_POLEXPIRE: 1936 return xfrm_exp_policy_notify(xp, dir, c); 1937 default: 1938 printk("xfrm_user: Unknown Policy event %d\n", c->event); 1939 } 1940 1941 return 0; 1942 1943 } 1944 1945 static struct xfrm_mgr netlink_mgr = { 1946 .id = "netlink", 1947 .notify = xfrm_send_state_notify, 1948 .acquire = xfrm_send_acquire, 1949 .compile_policy = xfrm_compile_policy, 1950 .notify_policy = xfrm_send_policy_notify, 1951 }; 1952 1953 static int __init xfrm_user_init(void) 1954 { 1955 struct sock *nlsk; 1956 1957 printk(KERN_INFO "Initializing IPsec netlink socket\n"); 1958 1959 nlsk = netlink_kernel_create(NETLINK_XFRM, XFRMNLGRP_MAX, 1960 xfrm_netlink_rcv, THIS_MODULE); 1961 if (nlsk == NULL) 1962 return -ENOMEM; 1963 rcu_assign_pointer(xfrm_nl, nlsk); 1964 1965 xfrm_register_km(&netlink_mgr); 1966 1967 return 0; 1968 } 1969 1970 static void __exit xfrm_user_exit(void) 1971 { 1972 struct sock *nlsk = xfrm_nl; 1973 1974 xfrm_unregister_km(&netlink_mgr); 1975 rcu_assign_pointer(xfrm_nl, NULL); 1976 synchronize_rcu(); 1977 sock_release(nlsk->sk_socket); 1978 } 1979 1980 module_init(xfrm_user_init); 1981 module_exit(xfrm_user_exit); 1982 MODULE_LICENSE("GPL"); 1983 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM); 1984 1985