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/rtnetlink.h> 23 #include <linux/pfkeyv2.h> 24 #include <linux/ipsec.h> 25 #include <linux/init.h> 26 #include <linux/security.h> 27 #include <net/sock.h> 28 #include <net/xfrm.h> 29 #include <net/netlink.h> 30 #include <asm/uaccess.h> 31 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 32 #include <linux/in6.h> 33 #endif 34 #include <linux/audit.h> 35 36 static int verify_one_alg(struct rtattr **xfrma, enum xfrm_attr_type_t type) 37 { 38 struct rtattr *rt = xfrma[type - 1]; 39 struct xfrm_algo *algp; 40 int len; 41 42 if (!rt) 43 return 0; 44 45 len = (rt->rta_len - sizeof(*rt)) - sizeof(*algp); 46 if (len < 0) 47 return -EINVAL; 48 49 algp = RTA_DATA(rt); 50 51 len -= (algp->alg_key_len + 7U) / 8; 52 if (len < 0) 53 return -EINVAL; 54 55 switch (type) { 56 case XFRMA_ALG_AUTH: 57 if (!algp->alg_key_len && 58 strcmp(algp->alg_name, "digest_null") != 0) 59 return -EINVAL; 60 break; 61 62 case XFRMA_ALG_CRYPT: 63 if (!algp->alg_key_len && 64 strcmp(algp->alg_name, "cipher_null") != 0) 65 return -EINVAL; 66 break; 67 68 case XFRMA_ALG_COMP: 69 /* Zero length keys are legal. */ 70 break; 71 72 default: 73 return -EINVAL; 74 } 75 76 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; 77 return 0; 78 } 79 80 static int verify_encap_tmpl(struct rtattr **xfrma) 81 { 82 struct rtattr *rt = xfrma[XFRMA_ENCAP - 1]; 83 struct xfrm_encap_tmpl *encap; 84 85 if (!rt) 86 return 0; 87 88 if ((rt->rta_len - sizeof(*rt)) < sizeof(*encap)) 89 return -EINVAL; 90 91 return 0; 92 } 93 94 static int verify_one_addr(struct rtattr **xfrma, enum xfrm_attr_type_t type, 95 xfrm_address_t **addrp) 96 { 97 struct rtattr *rt = xfrma[type - 1]; 98 99 if (!rt) 100 return 0; 101 102 if ((rt->rta_len - sizeof(*rt)) < sizeof(**addrp)) 103 return -EINVAL; 104 105 if (addrp) 106 *addrp = RTA_DATA(rt); 107 108 return 0; 109 } 110 111 static inline int verify_sec_ctx_len(struct rtattr **xfrma) 112 { 113 struct rtattr *rt = xfrma[XFRMA_SEC_CTX - 1]; 114 struct xfrm_user_sec_ctx *uctx; 115 int len = 0; 116 117 if (!rt) 118 return 0; 119 120 if (rt->rta_len < sizeof(*uctx)) 121 return -EINVAL; 122 123 uctx = RTA_DATA(rt); 124 125 len += sizeof(struct xfrm_user_sec_ctx); 126 len += uctx->ctx_len; 127 128 if (uctx->len != len) 129 return -EINVAL; 130 131 return 0; 132 } 133 134 135 static int verify_newsa_info(struct xfrm_usersa_info *p, 136 struct rtattr **xfrma) 137 { 138 int err; 139 140 err = -EINVAL; 141 switch (p->family) { 142 case AF_INET: 143 break; 144 145 case AF_INET6: 146 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 147 break; 148 #else 149 err = -EAFNOSUPPORT; 150 goto out; 151 #endif 152 153 default: 154 goto out; 155 } 156 157 err = -EINVAL; 158 switch (p->id.proto) { 159 case IPPROTO_AH: 160 if (!xfrma[XFRMA_ALG_AUTH-1] || 161 xfrma[XFRMA_ALG_CRYPT-1] || 162 xfrma[XFRMA_ALG_COMP-1]) 163 goto out; 164 break; 165 166 case IPPROTO_ESP: 167 if ((!xfrma[XFRMA_ALG_AUTH-1] && 168 !xfrma[XFRMA_ALG_CRYPT-1]) || 169 xfrma[XFRMA_ALG_COMP-1]) 170 goto out; 171 break; 172 173 case IPPROTO_COMP: 174 if (!xfrma[XFRMA_ALG_COMP-1] || 175 xfrma[XFRMA_ALG_AUTH-1] || 176 xfrma[XFRMA_ALG_CRYPT-1]) 177 goto out; 178 break; 179 180 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 181 case IPPROTO_DSTOPTS: 182 case IPPROTO_ROUTING: 183 if (xfrma[XFRMA_ALG_COMP-1] || 184 xfrma[XFRMA_ALG_AUTH-1] || 185 xfrma[XFRMA_ALG_CRYPT-1] || 186 xfrma[XFRMA_ENCAP-1] || 187 xfrma[XFRMA_SEC_CTX-1] || 188 !xfrma[XFRMA_COADDR-1]) 189 goto out; 190 break; 191 #endif 192 193 default: 194 goto out; 195 } 196 197 if ((err = verify_one_alg(xfrma, XFRMA_ALG_AUTH))) 198 goto out; 199 if ((err = verify_one_alg(xfrma, XFRMA_ALG_CRYPT))) 200 goto out; 201 if ((err = verify_one_alg(xfrma, XFRMA_ALG_COMP))) 202 goto out; 203 if ((err = verify_encap_tmpl(xfrma))) 204 goto out; 205 if ((err = verify_sec_ctx_len(xfrma))) 206 goto out; 207 if ((err = verify_one_addr(xfrma, XFRMA_COADDR, NULL))) 208 goto out; 209 210 err = -EINVAL; 211 switch (p->mode) { 212 case XFRM_MODE_TRANSPORT: 213 case XFRM_MODE_TUNNEL: 214 case XFRM_MODE_ROUTEOPTIMIZATION: 215 case XFRM_MODE_BEET: 216 break; 217 218 default: 219 goto out; 220 } 221 222 err = 0; 223 224 out: 225 return err; 226 } 227 228 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props, 229 struct xfrm_algo_desc *(*get_byname)(char *, int), 230 struct rtattr *u_arg) 231 { 232 struct rtattr *rta = u_arg; 233 struct xfrm_algo *p, *ualg; 234 struct xfrm_algo_desc *algo; 235 int len; 236 237 if (!rta) 238 return 0; 239 240 ualg = RTA_DATA(rta); 241 242 algo = get_byname(ualg->alg_name, 1); 243 if (!algo) 244 return -ENOSYS; 245 *props = algo->desc.sadb_alg_id; 246 247 len = sizeof(*ualg) + (ualg->alg_key_len + 7U) / 8; 248 p = kmemdup(ualg, len, GFP_KERNEL); 249 if (!p) 250 return -ENOMEM; 251 252 strcpy(p->alg_name, algo->name); 253 *algpp = p; 254 return 0; 255 } 256 257 static int attach_encap_tmpl(struct xfrm_encap_tmpl **encapp, struct rtattr *u_arg) 258 { 259 struct rtattr *rta = u_arg; 260 struct xfrm_encap_tmpl *p, *uencap; 261 262 if (!rta) 263 return 0; 264 265 uencap = RTA_DATA(rta); 266 p = kmemdup(uencap, sizeof(*p), GFP_KERNEL); 267 if (!p) 268 return -ENOMEM; 269 270 *encapp = p; 271 return 0; 272 } 273 274 275 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx) 276 { 277 int len = 0; 278 279 if (xfrm_ctx) { 280 len += sizeof(struct xfrm_user_sec_ctx); 281 len += xfrm_ctx->ctx_len; 282 } 283 return len; 284 } 285 286 static int attach_sec_ctx(struct xfrm_state *x, struct rtattr *u_arg) 287 { 288 struct xfrm_user_sec_ctx *uctx; 289 290 if (!u_arg) 291 return 0; 292 293 uctx = RTA_DATA(u_arg); 294 return security_xfrm_state_alloc(x, uctx); 295 } 296 297 static int attach_one_addr(xfrm_address_t **addrpp, struct rtattr *u_arg) 298 { 299 struct rtattr *rta = u_arg; 300 xfrm_address_t *p, *uaddrp; 301 302 if (!rta) 303 return 0; 304 305 uaddrp = RTA_DATA(rta); 306 p = kmemdup(uaddrp, sizeof(*p), GFP_KERNEL); 307 if (!p) 308 return -ENOMEM; 309 310 *addrpp = p; 311 return 0; 312 } 313 314 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 315 { 316 memcpy(&x->id, &p->id, sizeof(x->id)); 317 memcpy(&x->sel, &p->sel, sizeof(x->sel)); 318 memcpy(&x->lft, &p->lft, sizeof(x->lft)); 319 x->props.mode = p->mode; 320 x->props.replay_window = p->replay_window; 321 x->props.reqid = p->reqid; 322 x->props.family = p->family; 323 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr)); 324 x->props.flags = p->flags; 325 326 /* 327 * Set inner address family if the KM left it as zero. 328 * See comment in validate_tmpl. 329 */ 330 if (!x->sel.family) 331 x->sel.family = p->family; 332 } 333 334 /* 335 * someday when pfkey also has support, we could have the code 336 * somehow made shareable and move it to xfrm_state.c - JHS 337 * 338 */ 339 static int xfrm_update_ae_params(struct xfrm_state *x, struct rtattr **xfrma) 340 { 341 int err = - EINVAL; 342 struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1]; 343 struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1]; 344 struct rtattr *et = xfrma[XFRMA_ETIMER_THRESH-1]; 345 struct rtattr *rt = xfrma[XFRMA_REPLAY_THRESH-1]; 346 347 if (rp) { 348 struct xfrm_replay_state *replay; 349 if (RTA_PAYLOAD(rp) < sizeof(*replay)) 350 goto error; 351 replay = RTA_DATA(rp); 352 memcpy(&x->replay, replay, sizeof(*replay)); 353 memcpy(&x->preplay, replay, sizeof(*replay)); 354 } 355 356 if (lt) { 357 struct xfrm_lifetime_cur *ltime; 358 if (RTA_PAYLOAD(lt) < sizeof(*ltime)) 359 goto error; 360 ltime = RTA_DATA(lt); 361 x->curlft.bytes = ltime->bytes; 362 x->curlft.packets = ltime->packets; 363 x->curlft.add_time = ltime->add_time; 364 x->curlft.use_time = ltime->use_time; 365 } 366 367 if (et) { 368 if (RTA_PAYLOAD(et) < sizeof(u32)) 369 goto error; 370 x->replay_maxage = *(u32*)RTA_DATA(et); 371 } 372 373 if (rt) { 374 if (RTA_PAYLOAD(rt) < sizeof(u32)) 375 goto error; 376 x->replay_maxdiff = *(u32*)RTA_DATA(rt); 377 } 378 379 return 0; 380 error: 381 return err; 382 } 383 384 static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p, 385 struct rtattr **xfrma, 386 int *errp) 387 { 388 struct xfrm_state *x = xfrm_state_alloc(); 389 int err = -ENOMEM; 390 391 if (!x) 392 goto error_no_put; 393 394 copy_from_user_state(x, p); 395 396 if ((err = attach_one_algo(&x->aalg, &x->props.aalgo, 397 xfrm_aalg_get_byname, 398 xfrma[XFRMA_ALG_AUTH-1]))) 399 goto error; 400 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo, 401 xfrm_ealg_get_byname, 402 xfrma[XFRMA_ALG_CRYPT-1]))) 403 goto error; 404 if ((err = attach_one_algo(&x->calg, &x->props.calgo, 405 xfrm_calg_get_byname, 406 xfrma[XFRMA_ALG_COMP-1]))) 407 goto error; 408 if ((err = attach_encap_tmpl(&x->encap, xfrma[XFRMA_ENCAP-1]))) 409 goto error; 410 if ((err = attach_one_addr(&x->coaddr, xfrma[XFRMA_COADDR-1]))) 411 goto error; 412 err = xfrm_init_state(x); 413 if (err) 414 goto error; 415 416 if ((err = attach_sec_ctx(x, xfrma[XFRMA_SEC_CTX-1]))) 417 goto error; 418 419 x->km.seq = p->seq; 420 x->replay_maxdiff = sysctl_xfrm_aevent_rseqth; 421 /* sysctl_xfrm_aevent_etime is in 100ms units */ 422 x->replay_maxage = (sysctl_xfrm_aevent_etime*HZ)/XFRM_AE_ETH_M; 423 x->preplay.bitmap = 0; 424 x->preplay.seq = x->replay.seq+x->replay_maxdiff; 425 x->preplay.oseq = x->replay.oseq +x->replay_maxdiff; 426 427 /* override default values from above */ 428 429 err = xfrm_update_ae_params(x, (struct rtattr **)xfrma); 430 if (err < 0) 431 goto error; 432 433 return x; 434 435 error: 436 x->km.state = XFRM_STATE_DEAD; 437 xfrm_state_put(x); 438 error_no_put: 439 *errp = err; 440 return NULL; 441 } 442 443 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 444 struct rtattr **xfrma) 445 { 446 struct xfrm_usersa_info *p = NLMSG_DATA(nlh); 447 struct xfrm_state *x; 448 int err; 449 struct km_event c; 450 451 err = verify_newsa_info(p, xfrma); 452 if (err) 453 return err; 454 455 x = xfrm_state_construct(p, xfrma, &err); 456 if (!x) 457 return err; 458 459 xfrm_state_hold(x); 460 if (nlh->nlmsg_type == XFRM_MSG_NEWSA) 461 err = xfrm_state_add(x); 462 else 463 err = xfrm_state_update(x); 464 465 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid, 466 AUDIT_MAC_IPSEC_ADDSA, err ? 0 : 1, NULL, x); 467 468 if (err < 0) { 469 x->km.state = XFRM_STATE_DEAD; 470 __xfrm_state_put(x); 471 goto out; 472 } 473 474 c.seq = nlh->nlmsg_seq; 475 c.pid = nlh->nlmsg_pid; 476 c.event = nlh->nlmsg_type; 477 478 km_state_notify(x, &c); 479 out: 480 xfrm_state_put(x); 481 return err; 482 } 483 484 static struct xfrm_state *xfrm_user_state_lookup(struct xfrm_usersa_id *p, 485 struct rtattr **xfrma, 486 int *errp) 487 { 488 struct xfrm_state *x = NULL; 489 int err; 490 491 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) { 492 err = -ESRCH; 493 x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family); 494 } else { 495 xfrm_address_t *saddr = NULL; 496 497 err = verify_one_addr(xfrma, XFRMA_SRCADDR, &saddr); 498 if (err) 499 goto out; 500 501 if (!saddr) { 502 err = -EINVAL; 503 goto out; 504 } 505 506 err = -ESRCH; 507 x = xfrm_state_lookup_byaddr(&p->daddr, saddr, p->proto, 508 p->family); 509 } 510 511 out: 512 if (!x && errp) 513 *errp = err; 514 return x; 515 } 516 517 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 518 struct rtattr **xfrma) 519 { 520 struct xfrm_state *x; 521 int err = -ESRCH; 522 struct km_event c; 523 struct xfrm_usersa_id *p = NLMSG_DATA(nlh); 524 525 x = xfrm_user_state_lookup(p, xfrma, &err); 526 if (x == NULL) 527 return err; 528 529 if ((err = security_xfrm_state_delete(x)) != 0) 530 goto out; 531 532 if (xfrm_state_kern(x)) { 533 err = -EPERM; 534 goto out; 535 } 536 537 err = xfrm_state_delete(x); 538 539 if (err < 0) 540 goto out; 541 542 c.seq = nlh->nlmsg_seq; 543 c.pid = nlh->nlmsg_pid; 544 c.event = nlh->nlmsg_type; 545 km_state_notify(x, &c); 546 547 out: 548 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid, 549 AUDIT_MAC_IPSEC_DELSA, err ? 0 : 1, NULL, x); 550 xfrm_state_put(x); 551 return err; 552 } 553 554 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 555 { 556 memcpy(&p->id, &x->id, sizeof(p->id)); 557 memcpy(&p->sel, &x->sel, sizeof(p->sel)); 558 memcpy(&p->lft, &x->lft, sizeof(p->lft)); 559 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft)); 560 memcpy(&p->stats, &x->stats, sizeof(p->stats)); 561 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr)); 562 p->mode = x->props.mode; 563 p->replay_window = x->props.replay_window; 564 p->reqid = x->props.reqid; 565 p->family = x->props.family; 566 p->flags = x->props.flags; 567 p->seq = x->km.seq; 568 } 569 570 struct xfrm_dump_info { 571 struct sk_buff *in_skb; 572 struct sk_buff *out_skb; 573 u32 nlmsg_seq; 574 u16 nlmsg_flags; 575 int start_idx; 576 int this_idx; 577 }; 578 579 static int dump_one_state(struct xfrm_state *x, int count, void *ptr) 580 { 581 struct xfrm_dump_info *sp = ptr; 582 struct sk_buff *in_skb = sp->in_skb; 583 struct sk_buff *skb = sp->out_skb; 584 struct xfrm_usersa_info *p; 585 struct nlmsghdr *nlh; 586 unsigned char *b = skb_tail_pointer(skb); 587 588 if (sp->this_idx < sp->start_idx) 589 goto out; 590 591 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq, 592 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags); 593 if (nlh == NULL) 594 return -EMSGSIZE; 595 596 p = NLMSG_DATA(nlh); 597 copy_to_user_state(x, p); 598 599 if (x->aalg) 600 RTA_PUT(skb, XFRMA_ALG_AUTH, 601 sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg); 602 if (x->ealg) 603 RTA_PUT(skb, XFRMA_ALG_CRYPT, 604 sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg); 605 if (x->calg) 606 RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg); 607 608 if (x->encap) 609 RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap); 610 611 if (x->security) { 612 int ctx_size = sizeof(struct xfrm_sec_ctx) + 613 x->security->ctx_len; 614 struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size); 615 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt); 616 617 uctx->exttype = XFRMA_SEC_CTX; 618 uctx->len = ctx_size; 619 uctx->ctx_doi = x->security->ctx_doi; 620 uctx->ctx_alg = x->security->ctx_alg; 621 uctx->ctx_len = x->security->ctx_len; 622 memcpy(uctx + 1, x->security->ctx_str, x->security->ctx_len); 623 } 624 625 if (x->coaddr) 626 RTA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr); 627 628 if (x->lastused) 629 RTA_PUT(skb, XFRMA_LASTUSED, sizeof(x->lastused), &x->lastused); 630 631 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 632 out: 633 sp->this_idx++; 634 return 0; 635 636 rtattr_failure: 637 nlmsg_trim(skb, b); 638 return -1; 639 } 640 641 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb) 642 { 643 struct xfrm_dump_info info; 644 645 info.in_skb = cb->skb; 646 info.out_skb = skb; 647 info.nlmsg_seq = cb->nlh->nlmsg_seq; 648 info.nlmsg_flags = NLM_F_MULTI; 649 info.this_idx = 0; 650 info.start_idx = cb->args[0]; 651 (void) xfrm_state_walk(0, dump_one_state, &info); 652 cb->args[0] = info.this_idx; 653 654 return skb->len; 655 } 656 657 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb, 658 struct xfrm_state *x, u32 seq) 659 { 660 struct xfrm_dump_info info; 661 struct sk_buff *skb; 662 663 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); 664 if (!skb) 665 return ERR_PTR(-ENOMEM); 666 667 info.in_skb = in_skb; 668 info.out_skb = skb; 669 info.nlmsg_seq = seq; 670 info.nlmsg_flags = 0; 671 info.this_idx = info.start_idx = 0; 672 673 if (dump_one_state(x, 0, &info)) { 674 kfree_skb(skb); 675 return NULL; 676 } 677 678 return skb; 679 } 680 681 static int build_spdinfo(struct sk_buff *skb, u32 pid, u32 seq, u32 flags) 682 { 683 struct xfrmk_spdinfo si; 684 struct xfrmu_spdinfo spc; 685 struct xfrmu_spdhinfo sph; 686 struct nlmsghdr *nlh; 687 u32 *f; 688 689 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0); 690 if (nlh == NULL) /* shouldnt really happen ... */ 691 return -EMSGSIZE; 692 693 f = nlmsg_data(nlh); 694 *f = flags; 695 xfrm_spd_getinfo(&si); 696 spc.incnt = si.incnt; 697 spc.outcnt = si.outcnt; 698 spc.fwdcnt = si.fwdcnt; 699 spc.inscnt = si.inscnt; 700 spc.outscnt = si.outscnt; 701 spc.fwdscnt = si.fwdscnt; 702 sph.spdhcnt = si.spdhcnt; 703 sph.spdhmcnt = si.spdhmcnt; 704 705 NLA_PUT(skb, XFRMA_SPD_INFO, sizeof(spc), &spc); 706 NLA_PUT(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph); 707 708 return nlmsg_end(skb, nlh); 709 710 nla_put_failure: 711 nlmsg_cancel(skb, nlh); 712 return -EMSGSIZE; 713 } 714 715 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 716 struct rtattr **xfrma) 717 { 718 struct sk_buff *r_skb; 719 u32 *flags = NLMSG_DATA(nlh); 720 u32 spid = NETLINK_CB(skb).pid; 721 u32 seq = nlh->nlmsg_seq; 722 int len = NLMSG_LENGTH(sizeof(u32)); 723 724 len += RTA_SPACE(sizeof(struct xfrmu_spdinfo)); 725 len += RTA_SPACE(sizeof(struct xfrmu_spdhinfo)); 726 727 r_skb = alloc_skb(len, GFP_ATOMIC); 728 if (r_skb == NULL) 729 return -ENOMEM; 730 731 if (build_spdinfo(r_skb, spid, seq, *flags) < 0) 732 BUG(); 733 734 return nlmsg_unicast(xfrm_nl, r_skb, spid); 735 } 736 737 static int build_sadinfo(struct sk_buff *skb, u32 pid, u32 seq, u32 flags) 738 { 739 struct xfrmk_sadinfo si; 740 struct xfrmu_sadhinfo sh; 741 struct nlmsghdr *nlh; 742 u32 *f; 743 744 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0); 745 if (nlh == NULL) /* shouldnt really happen ... */ 746 return -EMSGSIZE; 747 748 f = nlmsg_data(nlh); 749 *f = flags; 750 xfrm_sad_getinfo(&si); 751 752 sh.sadhmcnt = si.sadhmcnt; 753 sh.sadhcnt = si.sadhcnt; 754 755 NLA_PUT_U32(skb, XFRMA_SAD_CNT, si.sadcnt); 756 NLA_PUT(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh); 757 758 return nlmsg_end(skb, nlh); 759 760 nla_put_failure: 761 nlmsg_cancel(skb, nlh); 762 return -EMSGSIZE; 763 } 764 765 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 766 struct rtattr **xfrma) 767 { 768 struct sk_buff *r_skb; 769 u32 *flags = NLMSG_DATA(nlh); 770 u32 spid = NETLINK_CB(skb).pid; 771 u32 seq = nlh->nlmsg_seq; 772 int len = NLMSG_LENGTH(sizeof(u32)); 773 774 len += RTA_SPACE(sizeof(struct xfrmu_sadhinfo)); 775 len += RTA_SPACE(sizeof(u32)); 776 777 r_skb = alloc_skb(len, GFP_ATOMIC); 778 779 if (r_skb == NULL) 780 return -ENOMEM; 781 782 if (build_sadinfo(r_skb, spid, seq, *flags) < 0) 783 BUG(); 784 785 return nlmsg_unicast(xfrm_nl, r_skb, spid); 786 } 787 788 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 789 struct rtattr **xfrma) 790 { 791 struct xfrm_usersa_id *p = NLMSG_DATA(nlh); 792 struct xfrm_state *x; 793 struct sk_buff *resp_skb; 794 int err = -ESRCH; 795 796 x = xfrm_user_state_lookup(p, xfrma, &err); 797 if (x == NULL) 798 goto out_noput; 799 800 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 801 if (IS_ERR(resp_skb)) { 802 err = PTR_ERR(resp_skb); 803 } else { 804 err = netlink_unicast(xfrm_nl, resp_skb, 805 NETLINK_CB(skb).pid, MSG_DONTWAIT); 806 } 807 xfrm_state_put(x); 808 out_noput: 809 return err; 810 } 811 812 static int verify_userspi_info(struct xfrm_userspi_info *p) 813 { 814 switch (p->info.id.proto) { 815 case IPPROTO_AH: 816 case IPPROTO_ESP: 817 break; 818 819 case IPPROTO_COMP: 820 /* IPCOMP spi is 16-bits. */ 821 if (p->max >= 0x10000) 822 return -EINVAL; 823 break; 824 825 default: 826 return -EINVAL; 827 } 828 829 if (p->min > p->max) 830 return -EINVAL; 831 832 return 0; 833 } 834 835 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, 836 struct rtattr **xfrma) 837 { 838 struct xfrm_state *x; 839 struct xfrm_userspi_info *p; 840 struct sk_buff *resp_skb; 841 xfrm_address_t *daddr; 842 int family; 843 int err; 844 845 p = NLMSG_DATA(nlh); 846 err = verify_userspi_info(p); 847 if (err) 848 goto out_noput; 849 850 family = p->info.family; 851 daddr = &p->info.id.daddr; 852 853 x = NULL; 854 if (p->info.seq) { 855 x = xfrm_find_acq_byseq(p->info.seq); 856 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) { 857 xfrm_state_put(x); 858 x = NULL; 859 } 860 } 861 862 if (!x) 863 x = xfrm_find_acq(p->info.mode, p->info.reqid, 864 p->info.id.proto, daddr, 865 &p->info.saddr, 1, 866 family); 867 err = -ENOENT; 868 if (x == NULL) 869 goto out_noput; 870 871 resp_skb = ERR_PTR(-ENOENT); 872 873 spin_lock_bh(&x->lock); 874 if (x->km.state != XFRM_STATE_DEAD) { 875 xfrm_alloc_spi(x, htonl(p->min), htonl(p->max)); 876 if (x->id.spi) 877 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 878 } 879 spin_unlock_bh(&x->lock); 880 881 if (IS_ERR(resp_skb)) { 882 err = PTR_ERR(resp_skb); 883 goto out; 884 } 885 886 err = netlink_unicast(xfrm_nl, resp_skb, 887 NETLINK_CB(skb).pid, MSG_DONTWAIT); 888 889 out: 890 xfrm_state_put(x); 891 out_noput: 892 return err; 893 } 894 895 static int verify_policy_dir(u8 dir) 896 { 897 switch (dir) { 898 case XFRM_POLICY_IN: 899 case XFRM_POLICY_OUT: 900 case XFRM_POLICY_FWD: 901 break; 902 903 default: 904 return -EINVAL; 905 } 906 907 return 0; 908 } 909 910 static int verify_policy_type(u8 type) 911 { 912 switch (type) { 913 case XFRM_POLICY_TYPE_MAIN: 914 #ifdef CONFIG_XFRM_SUB_POLICY 915 case XFRM_POLICY_TYPE_SUB: 916 #endif 917 break; 918 919 default: 920 return -EINVAL; 921 } 922 923 return 0; 924 } 925 926 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p) 927 { 928 switch (p->share) { 929 case XFRM_SHARE_ANY: 930 case XFRM_SHARE_SESSION: 931 case XFRM_SHARE_USER: 932 case XFRM_SHARE_UNIQUE: 933 break; 934 935 default: 936 return -EINVAL; 937 } 938 939 switch (p->action) { 940 case XFRM_POLICY_ALLOW: 941 case XFRM_POLICY_BLOCK: 942 break; 943 944 default: 945 return -EINVAL; 946 } 947 948 switch (p->sel.family) { 949 case AF_INET: 950 break; 951 952 case AF_INET6: 953 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 954 break; 955 #else 956 return -EAFNOSUPPORT; 957 #endif 958 959 default: 960 return -EINVAL; 961 } 962 963 return verify_policy_dir(p->dir); 964 } 965 966 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct rtattr **xfrma) 967 { 968 struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1]; 969 struct xfrm_user_sec_ctx *uctx; 970 971 if (!rt) 972 return 0; 973 974 uctx = RTA_DATA(rt); 975 return security_xfrm_policy_alloc(pol, uctx); 976 } 977 978 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut, 979 int nr) 980 { 981 int i; 982 983 xp->xfrm_nr = nr; 984 for (i = 0; i < nr; i++, ut++) { 985 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 986 987 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id)); 988 memcpy(&t->saddr, &ut->saddr, 989 sizeof(xfrm_address_t)); 990 t->reqid = ut->reqid; 991 t->mode = ut->mode; 992 t->share = ut->share; 993 t->optional = ut->optional; 994 t->aalgos = ut->aalgos; 995 t->ealgos = ut->ealgos; 996 t->calgos = ut->calgos; 997 t->encap_family = ut->family; 998 } 999 } 1000 1001 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family) 1002 { 1003 int i; 1004 1005 if (nr > XFRM_MAX_DEPTH) 1006 return -EINVAL; 1007 1008 for (i = 0; i < nr; i++) { 1009 /* We never validated the ut->family value, so many 1010 * applications simply leave it at zero. The check was 1011 * never made and ut->family was ignored because all 1012 * templates could be assumed to have the same family as 1013 * the policy itself. Now that we will have ipv4-in-ipv6 1014 * and ipv6-in-ipv4 tunnels, this is no longer true. 1015 */ 1016 if (!ut[i].family) 1017 ut[i].family = family; 1018 1019 switch (ut[i].family) { 1020 case AF_INET: 1021 break; 1022 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1023 case AF_INET6: 1024 break; 1025 #endif 1026 default: 1027 return -EINVAL; 1028 } 1029 } 1030 1031 return 0; 1032 } 1033 1034 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct rtattr **xfrma) 1035 { 1036 struct rtattr *rt = xfrma[XFRMA_TMPL-1]; 1037 1038 if (!rt) { 1039 pol->xfrm_nr = 0; 1040 } else { 1041 struct xfrm_user_tmpl *utmpl = RTA_DATA(rt); 1042 int nr = (rt->rta_len - sizeof(*rt)) / sizeof(*utmpl); 1043 int err; 1044 1045 err = validate_tmpl(nr, utmpl, pol->family); 1046 if (err) 1047 return err; 1048 1049 copy_templates(pol, RTA_DATA(rt), nr); 1050 } 1051 return 0; 1052 } 1053 1054 static int copy_from_user_policy_type(u8 *tp, struct rtattr **xfrma) 1055 { 1056 struct rtattr *rt = xfrma[XFRMA_POLICY_TYPE-1]; 1057 struct xfrm_userpolicy_type *upt; 1058 u8 type = XFRM_POLICY_TYPE_MAIN; 1059 int err; 1060 1061 if (rt) { 1062 if (rt->rta_len < sizeof(*upt)) 1063 return -EINVAL; 1064 1065 upt = RTA_DATA(rt); 1066 type = upt->type; 1067 } 1068 1069 err = verify_policy_type(type); 1070 if (err) 1071 return err; 1072 1073 *tp = type; 1074 return 0; 1075 } 1076 1077 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p) 1078 { 1079 xp->priority = p->priority; 1080 xp->index = p->index; 1081 memcpy(&xp->selector, &p->sel, sizeof(xp->selector)); 1082 memcpy(&xp->lft, &p->lft, sizeof(xp->lft)); 1083 xp->action = p->action; 1084 xp->flags = p->flags; 1085 xp->family = p->sel.family; 1086 /* XXX xp->share = p->share; */ 1087 } 1088 1089 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir) 1090 { 1091 memcpy(&p->sel, &xp->selector, sizeof(p->sel)); 1092 memcpy(&p->lft, &xp->lft, sizeof(p->lft)); 1093 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft)); 1094 p->priority = xp->priority; 1095 p->index = xp->index; 1096 p->sel.family = xp->family; 1097 p->dir = dir; 1098 p->action = xp->action; 1099 p->flags = xp->flags; 1100 p->share = XFRM_SHARE_ANY; /* XXX xp->share */ 1101 } 1102 1103 static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p, struct rtattr **xfrma, int *errp) 1104 { 1105 struct xfrm_policy *xp = xfrm_policy_alloc(GFP_KERNEL); 1106 int err; 1107 1108 if (!xp) { 1109 *errp = -ENOMEM; 1110 return NULL; 1111 } 1112 1113 copy_from_user_policy(xp, p); 1114 1115 err = copy_from_user_policy_type(&xp->type, xfrma); 1116 if (err) 1117 goto error; 1118 1119 if (!(err = copy_from_user_tmpl(xp, xfrma))) 1120 err = copy_from_user_sec_ctx(xp, xfrma); 1121 if (err) 1122 goto error; 1123 1124 return xp; 1125 error: 1126 *errp = err; 1127 kfree(xp); 1128 return NULL; 1129 } 1130 1131 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1132 struct rtattr **xfrma) 1133 { 1134 struct xfrm_userpolicy_info *p = NLMSG_DATA(nlh); 1135 struct xfrm_policy *xp; 1136 struct km_event c; 1137 int err; 1138 int excl; 1139 1140 err = verify_newpolicy_info(p); 1141 if (err) 1142 return err; 1143 err = verify_sec_ctx_len(xfrma); 1144 if (err) 1145 return err; 1146 1147 xp = xfrm_policy_construct(p, xfrma, &err); 1148 if (!xp) 1149 return err; 1150 1151 /* shouldnt excl be based on nlh flags?? 1152 * Aha! this is anti-netlink really i.e more pfkey derived 1153 * in netlink excl is a flag and you wouldnt need 1154 * a type XFRM_MSG_UPDPOLICY - JHS */ 1155 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY; 1156 err = xfrm_policy_insert(p->dir, xp, excl); 1157 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid, 1158 AUDIT_MAC_IPSEC_DELSPD, err ? 0 : 1, xp, NULL); 1159 1160 if (err) { 1161 security_xfrm_policy_free(xp); 1162 kfree(xp); 1163 return err; 1164 } 1165 1166 c.event = nlh->nlmsg_type; 1167 c.seq = nlh->nlmsg_seq; 1168 c.pid = nlh->nlmsg_pid; 1169 km_policy_notify(xp, p->dir, &c); 1170 1171 xfrm_pol_put(xp); 1172 1173 return 0; 1174 } 1175 1176 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb) 1177 { 1178 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH]; 1179 int i; 1180 1181 if (xp->xfrm_nr == 0) 1182 return 0; 1183 1184 for (i = 0; i < xp->xfrm_nr; i++) { 1185 struct xfrm_user_tmpl *up = &vec[i]; 1186 struct xfrm_tmpl *kp = &xp->xfrm_vec[i]; 1187 1188 memcpy(&up->id, &kp->id, sizeof(up->id)); 1189 up->family = kp->encap_family; 1190 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr)); 1191 up->reqid = kp->reqid; 1192 up->mode = kp->mode; 1193 up->share = kp->share; 1194 up->optional = kp->optional; 1195 up->aalgos = kp->aalgos; 1196 up->ealgos = kp->ealgos; 1197 up->calgos = kp->calgos; 1198 } 1199 RTA_PUT(skb, XFRMA_TMPL, 1200 (sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr), 1201 vec); 1202 1203 return 0; 1204 1205 rtattr_failure: 1206 return -1; 1207 } 1208 1209 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb) 1210 { 1211 int ctx_size = sizeof(struct xfrm_sec_ctx) + s->ctx_len; 1212 struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size); 1213 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt); 1214 1215 uctx->exttype = XFRMA_SEC_CTX; 1216 uctx->len = ctx_size; 1217 uctx->ctx_doi = s->ctx_doi; 1218 uctx->ctx_alg = s->ctx_alg; 1219 uctx->ctx_len = s->ctx_len; 1220 memcpy(uctx + 1, s->ctx_str, s->ctx_len); 1221 return 0; 1222 1223 rtattr_failure: 1224 return -1; 1225 } 1226 1227 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb) 1228 { 1229 if (x->security) { 1230 return copy_sec_ctx(x->security, skb); 1231 } 1232 return 0; 1233 } 1234 1235 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb) 1236 { 1237 if (xp->security) { 1238 return copy_sec_ctx(xp->security, skb); 1239 } 1240 return 0; 1241 } 1242 1243 #ifdef CONFIG_XFRM_SUB_POLICY 1244 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1245 { 1246 struct xfrm_userpolicy_type upt; 1247 1248 memset(&upt, 0, sizeof(upt)); 1249 upt.type = type; 1250 1251 RTA_PUT(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt); 1252 1253 return 0; 1254 1255 rtattr_failure: 1256 return -1; 1257 } 1258 1259 #else 1260 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1261 { 1262 return 0; 1263 } 1264 #endif 1265 1266 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr) 1267 { 1268 struct xfrm_dump_info *sp = ptr; 1269 struct xfrm_userpolicy_info *p; 1270 struct sk_buff *in_skb = sp->in_skb; 1271 struct sk_buff *skb = sp->out_skb; 1272 struct nlmsghdr *nlh; 1273 unsigned char *b = skb_tail_pointer(skb); 1274 1275 if (sp->this_idx < sp->start_idx) 1276 goto out; 1277 1278 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq, 1279 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags); 1280 if (nlh == NULL) 1281 return -EMSGSIZE; 1282 p = NLMSG_DATA(nlh); 1283 1284 copy_to_user_policy(xp, p, dir); 1285 if (copy_to_user_tmpl(xp, skb) < 0) 1286 goto nlmsg_failure; 1287 if (copy_to_user_sec_ctx(xp, skb)) 1288 goto nlmsg_failure; 1289 if (copy_to_user_policy_type(xp->type, skb) < 0) 1290 goto nlmsg_failure; 1291 1292 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 1293 out: 1294 sp->this_idx++; 1295 return 0; 1296 1297 nlmsg_failure: 1298 nlmsg_trim(skb, b); 1299 return -1; 1300 } 1301 1302 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb) 1303 { 1304 struct xfrm_dump_info info; 1305 1306 info.in_skb = cb->skb; 1307 info.out_skb = skb; 1308 info.nlmsg_seq = cb->nlh->nlmsg_seq; 1309 info.nlmsg_flags = NLM_F_MULTI; 1310 info.this_idx = 0; 1311 info.start_idx = cb->args[0]; 1312 (void) xfrm_policy_walk(XFRM_POLICY_TYPE_MAIN, dump_one_policy, &info); 1313 #ifdef CONFIG_XFRM_SUB_POLICY 1314 (void) xfrm_policy_walk(XFRM_POLICY_TYPE_SUB, dump_one_policy, &info); 1315 #endif 1316 cb->args[0] = info.this_idx; 1317 1318 return skb->len; 1319 } 1320 1321 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb, 1322 struct xfrm_policy *xp, 1323 int dir, u32 seq) 1324 { 1325 struct xfrm_dump_info info; 1326 struct sk_buff *skb; 1327 1328 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); 1329 if (!skb) 1330 return ERR_PTR(-ENOMEM); 1331 1332 info.in_skb = in_skb; 1333 info.out_skb = skb; 1334 info.nlmsg_seq = seq; 1335 info.nlmsg_flags = 0; 1336 info.this_idx = info.start_idx = 0; 1337 1338 if (dump_one_policy(xp, dir, 0, &info) < 0) { 1339 kfree_skb(skb); 1340 return NULL; 1341 } 1342 1343 return skb; 1344 } 1345 1346 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1347 struct rtattr **xfrma) 1348 { 1349 struct xfrm_policy *xp; 1350 struct xfrm_userpolicy_id *p; 1351 u8 type = XFRM_POLICY_TYPE_MAIN; 1352 int err; 1353 struct km_event c; 1354 int delete; 1355 1356 p = NLMSG_DATA(nlh); 1357 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY; 1358 1359 err = copy_from_user_policy_type(&type, xfrma); 1360 if (err) 1361 return err; 1362 1363 err = verify_policy_dir(p->dir); 1364 if (err) 1365 return err; 1366 1367 if (p->index) 1368 xp = xfrm_policy_byid(type, p->dir, p->index, delete, &err); 1369 else { 1370 struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1]; 1371 struct xfrm_policy tmp; 1372 1373 err = verify_sec_ctx_len(xfrma); 1374 if (err) 1375 return err; 1376 1377 memset(&tmp, 0, sizeof(struct xfrm_policy)); 1378 if (rt) { 1379 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt); 1380 1381 if ((err = security_xfrm_policy_alloc(&tmp, uctx))) 1382 return err; 1383 } 1384 xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security, 1385 delete, &err); 1386 security_xfrm_policy_free(&tmp); 1387 } 1388 if (xp == NULL) 1389 return -ENOENT; 1390 1391 if (!delete) { 1392 struct sk_buff *resp_skb; 1393 1394 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq); 1395 if (IS_ERR(resp_skb)) { 1396 err = PTR_ERR(resp_skb); 1397 } else { 1398 err = netlink_unicast(xfrm_nl, resp_skb, 1399 NETLINK_CB(skb).pid, 1400 MSG_DONTWAIT); 1401 } 1402 } else { 1403 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid, 1404 AUDIT_MAC_IPSEC_DELSPD, err ? 0 : 1, xp, NULL); 1405 1406 if (err != 0) 1407 goto out; 1408 1409 c.data.byid = p->index; 1410 c.event = nlh->nlmsg_type; 1411 c.seq = nlh->nlmsg_seq; 1412 c.pid = nlh->nlmsg_pid; 1413 km_policy_notify(xp, p->dir, &c); 1414 } 1415 1416 out: 1417 xfrm_pol_put(xp); 1418 return err; 1419 } 1420 1421 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 1422 struct rtattr **xfrma) 1423 { 1424 struct km_event c; 1425 struct xfrm_usersa_flush *p = NLMSG_DATA(nlh); 1426 struct xfrm_audit audit_info; 1427 int err; 1428 1429 audit_info.loginuid = NETLINK_CB(skb).loginuid; 1430 audit_info.secid = NETLINK_CB(skb).sid; 1431 err = xfrm_state_flush(p->proto, &audit_info); 1432 if (err) 1433 return err; 1434 c.data.proto = p->proto; 1435 c.event = nlh->nlmsg_type; 1436 c.seq = nlh->nlmsg_seq; 1437 c.pid = nlh->nlmsg_pid; 1438 km_state_notify(NULL, &c); 1439 1440 return 0; 1441 } 1442 1443 1444 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c) 1445 { 1446 struct xfrm_aevent_id *id; 1447 struct nlmsghdr *nlh; 1448 struct xfrm_lifetime_cur ltime; 1449 unsigned char *b = skb_tail_pointer(skb); 1450 1451 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0); 1452 if (nlh == NULL) 1453 return -EMSGSIZE; 1454 id = NLMSG_DATA(nlh); 1455 1456 memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr)); 1457 id->sa_id.spi = x->id.spi; 1458 id->sa_id.family = x->props.family; 1459 id->sa_id.proto = x->id.proto; 1460 memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr)); 1461 id->reqid = x->props.reqid; 1462 id->flags = c->data.aevent; 1463 1464 RTA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay); 1465 1466 ltime.bytes = x->curlft.bytes; 1467 ltime.packets = x->curlft.packets; 1468 ltime.add_time = x->curlft.add_time; 1469 ltime.use_time = x->curlft.use_time; 1470 1471 RTA_PUT(skb, XFRMA_LTIME_VAL, sizeof(struct xfrm_lifetime_cur), <ime); 1472 1473 if (id->flags&XFRM_AE_RTHR) { 1474 RTA_PUT(skb,XFRMA_REPLAY_THRESH,sizeof(u32),&x->replay_maxdiff); 1475 } 1476 1477 if (id->flags&XFRM_AE_ETHR) { 1478 u32 etimer = x->replay_maxage*10/HZ; 1479 RTA_PUT(skb,XFRMA_ETIMER_THRESH,sizeof(u32),&etimer); 1480 } 1481 1482 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 1483 return skb->len; 1484 1485 rtattr_failure: 1486 nlmsg_trim(skb, b); 1487 return -1; 1488 } 1489 1490 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 1491 struct rtattr **xfrma) 1492 { 1493 struct xfrm_state *x; 1494 struct sk_buff *r_skb; 1495 int err; 1496 struct km_event c; 1497 struct xfrm_aevent_id *p = NLMSG_DATA(nlh); 1498 int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id)); 1499 struct xfrm_usersa_id *id = &p->sa_id; 1500 1501 len += RTA_SPACE(sizeof(struct xfrm_replay_state)); 1502 len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur)); 1503 1504 if (p->flags&XFRM_AE_RTHR) 1505 len+=RTA_SPACE(sizeof(u32)); 1506 1507 if (p->flags&XFRM_AE_ETHR) 1508 len+=RTA_SPACE(sizeof(u32)); 1509 1510 r_skb = alloc_skb(len, GFP_ATOMIC); 1511 if (r_skb == NULL) 1512 return -ENOMEM; 1513 1514 x = xfrm_state_lookup(&id->daddr, id->spi, id->proto, id->family); 1515 if (x == NULL) { 1516 kfree_skb(r_skb); 1517 return -ESRCH; 1518 } 1519 1520 /* 1521 * XXX: is this lock really needed - none of the other 1522 * gets lock (the concern is things getting updated 1523 * while we are still reading) - jhs 1524 */ 1525 spin_lock_bh(&x->lock); 1526 c.data.aevent = p->flags; 1527 c.seq = nlh->nlmsg_seq; 1528 c.pid = nlh->nlmsg_pid; 1529 1530 if (build_aevent(r_skb, x, &c) < 0) 1531 BUG(); 1532 err = netlink_unicast(xfrm_nl, r_skb, 1533 NETLINK_CB(skb).pid, MSG_DONTWAIT); 1534 spin_unlock_bh(&x->lock); 1535 xfrm_state_put(x); 1536 return err; 1537 } 1538 1539 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 1540 struct rtattr **xfrma) 1541 { 1542 struct xfrm_state *x; 1543 struct km_event c; 1544 int err = - EINVAL; 1545 struct xfrm_aevent_id *p = NLMSG_DATA(nlh); 1546 struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1]; 1547 struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1]; 1548 1549 if (!lt && !rp) 1550 return err; 1551 1552 /* pedantic mode - thou shalt sayeth replaceth */ 1553 if (!(nlh->nlmsg_flags&NLM_F_REPLACE)) 1554 return err; 1555 1556 x = xfrm_state_lookup(&p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family); 1557 if (x == NULL) 1558 return -ESRCH; 1559 1560 if (x->km.state != XFRM_STATE_VALID) 1561 goto out; 1562 1563 spin_lock_bh(&x->lock); 1564 err = xfrm_update_ae_params(x, xfrma); 1565 spin_unlock_bh(&x->lock); 1566 if (err < 0) 1567 goto out; 1568 1569 c.event = nlh->nlmsg_type; 1570 c.seq = nlh->nlmsg_seq; 1571 c.pid = nlh->nlmsg_pid; 1572 c.data.aevent = XFRM_AE_CU; 1573 km_state_notify(x, &c); 1574 err = 0; 1575 out: 1576 xfrm_state_put(x); 1577 return err; 1578 } 1579 1580 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1581 struct rtattr **xfrma) 1582 { 1583 struct km_event c; 1584 u8 type = XFRM_POLICY_TYPE_MAIN; 1585 int err; 1586 struct xfrm_audit audit_info; 1587 1588 err = copy_from_user_policy_type(&type, xfrma); 1589 if (err) 1590 return err; 1591 1592 audit_info.loginuid = NETLINK_CB(skb).loginuid; 1593 audit_info.secid = NETLINK_CB(skb).sid; 1594 err = xfrm_policy_flush(type, &audit_info); 1595 if (err) 1596 return err; 1597 c.data.type = type; 1598 c.event = nlh->nlmsg_type; 1599 c.seq = nlh->nlmsg_seq; 1600 c.pid = nlh->nlmsg_pid; 1601 km_policy_notify(NULL, 0, &c); 1602 return 0; 1603 } 1604 1605 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 1606 struct rtattr **xfrma) 1607 { 1608 struct xfrm_policy *xp; 1609 struct xfrm_user_polexpire *up = NLMSG_DATA(nlh); 1610 struct xfrm_userpolicy_info *p = &up->pol; 1611 u8 type = XFRM_POLICY_TYPE_MAIN; 1612 int err = -ENOENT; 1613 1614 err = copy_from_user_policy_type(&type, xfrma); 1615 if (err) 1616 return err; 1617 1618 if (p->index) 1619 xp = xfrm_policy_byid(type, p->dir, p->index, 0, &err); 1620 else { 1621 struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1]; 1622 struct xfrm_policy tmp; 1623 1624 err = verify_sec_ctx_len(xfrma); 1625 if (err) 1626 return err; 1627 1628 memset(&tmp, 0, sizeof(struct xfrm_policy)); 1629 if (rt) { 1630 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt); 1631 1632 if ((err = security_xfrm_policy_alloc(&tmp, uctx))) 1633 return err; 1634 } 1635 xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security, 1636 0, &err); 1637 security_xfrm_policy_free(&tmp); 1638 } 1639 1640 if (xp == NULL) 1641 return -ENOENT; 1642 read_lock(&xp->lock); 1643 if (xp->dead) { 1644 read_unlock(&xp->lock); 1645 goto out; 1646 } 1647 1648 read_unlock(&xp->lock); 1649 err = 0; 1650 if (up->hard) { 1651 xfrm_policy_delete(xp, p->dir); 1652 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid, 1653 AUDIT_MAC_IPSEC_DELSPD, 1, xp, NULL); 1654 1655 } else { 1656 // reset the timers here? 1657 printk("Dont know what to do with soft policy expire\n"); 1658 } 1659 km_policy_expired(xp, p->dir, up->hard, current->pid); 1660 1661 out: 1662 xfrm_pol_put(xp); 1663 return err; 1664 } 1665 1666 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 1667 struct rtattr **xfrma) 1668 { 1669 struct xfrm_state *x; 1670 int err; 1671 struct xfrm_user_expire *ue = NLMSG_DATA(nlh); 1672 struct xfrm_usersa_info *p = &ue->state; 1673 1674 x = xfrm_state_lookup(&p->id.daddr, p->id.spi, p->id.proto, p->family); 1675 1676 err = -ENOENT; 1677 if (x == NULL) 1678 return err; 1679 1680 spin_lock_bh(&x->lock); 1681 err = -EINVAL; 1682 if (x->km.state != XFRM_STATE_VALID) 1683 goto out; 1684 km_state_expired(x, ue->hard, current->pid); 1685 1686 if (ue->hard) { 1687 __xfrm_state_delete(x); 1688 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid, 1689 AUDIT_MAC_IPSEC_DELSA, 1, NULL, x); 1690 } 1691 err = 0; 1692 out: 1693 spin_unlock_bh(&x->lock); 1694 xfrm_state_put(x); 1695 return err; 1696 } 1697 1698 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, 1699 struct rtattr **xfrma) 1700 { 1701 struct xfrm_policy *xp; 1702 struct xfrm_user_tmpl *ut; 1703 int i; 1704 struct rtattr *rt = xfrma[XFRMA_TMPL-1]; 1705 1706 struct xfrm_user_acquire *ua = NLMSG_DATA(nlh); 1707 struct xfrm_state *x = xfrm_state_alloc(); 1708 int err = -ENOMEM; 1709 1710 if (!x) 1711 return err; 1712 1713 err = verify_newpolicy_info(&ua->policy); 1714 if (err) { 1715 printk("BAD policy passed\n"); 1716 kfree(x); 1717 return err; 1718 } 1719 1720 /* build an XP */ 1721 xp = xfrm_policy_construct(&ua->policy, (struct rtattr **) xfrma, &err); 1722 if (!xp) { 1723 kfree(x); 1724 return err; 1725 } 1726 1727 memcpy(&x->id, &ua->id, sizeof(ua->id)); 1728 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr)); 1729 memcpy(&x->sel, &ua->sel, sizeof(ua->sel)); 1730 1731 ut = RTA_DATA(rt); 1732 /* extract the templates and for each call km_key */ 1733 for (i = 0; i < xp->xfrm_nr; i++, ut++) { 1734 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 1735 memcpy(&x->id, &t->id, sizeof(x->id)); 1736 x->props.mode = t->mode; 1737 x->props.reqid = t->reqid; 1738 x->props.family = ut->family; 1739 t->aalgos = ua->aalgos; 1740 t->ealgos = ua->ealgos; 1741 t->calgos = ua->calgos; 1742 err = km_query(x, t, xp); 1743 1744 } 1745 1746 kfree(x); 1747 kfree(xp); 1748 1749 return 0; 1750 } 1751 1752 #ifdef CONFIG_XFRM_MIGRATE 1753 static int verify_user_migrate(struct rtattr **xfrma) 1754 { 1755 struct rtattr *rt = xfrma[XFRMA_MIGRATE-1]; 1756 struct xfrm_user_migrate *um; 1757 1758 if (!rt) 1759 return -EINVAL; 1760 1761 if ((rt->rta_len - sizeof(*rt)) < sizeof(*um)) 1762 return -EINVAL; 1763 1764 return 0; 1765 } 1766 1767 static int copy_from_user_migrate(struct xfrm_migrate *ma, 1768 struct rtattr **xfrma, int *num) 1769 { 1770 struct rtattr *rt = xfrma[XFRMA_MIGRATE-1]; 1771 struct xfrm_user_migrate *um; 1772 int i, num_migrate; 1773 1774 um = RTA_DATA(rt); 1775 num_migrate = (rt->rta_len - sizeof(*rt)) / sizeof(*um); 1776 1777 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH) 1778 return -EINVAL; 1779 1780 for (i = 0; i < num_migrate; i++, um++, ma++) { 1781 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr)); 1782 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr)); 1783 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr)); 1784 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr)); 1785 1786 ma->proto = um->proto; 1787 ma->mode = um->mode; 1788 ma->reqid = um->reqid; 1789 1790 ma->old_family = um->old_family; 1791 ma->new_family = um->new_family; 1792 } 1793 1794 *num = i; 1795 return 0; 1796 } 1797 1798 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 1799 struct rtattr **xfrma) 1800 { 1801 struct xfrm_userpolicy_id *pi = NLMSG_DATA(nlh); 1802 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 1803 u8 type; 1804 int err; 1805 int n = 0; 1806 1807 err = verify_user_migrate((struct rtattr **)xfrma); 1808 if (err) 1809 return err; 1810 1811 err = copy_from_user_policy_type(&type, (struct rtattr **)xfrma); 1812 if (err) 1813 return err; 1814 1815 err = copy_from_user_migrate((struct xfrm_migrate *)m, 1816 (struct rtattr **)xfrma, &n); 1817 if (err) 1818 return err; 1819 1820 if (!n) 1821 return 0; 1822 1823 xfrm_migrate(&pi->sel, pi->dir, type, m, n); 1824 1825 return 0; 1826 } 1827 #else 1828 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 1829 struct rtattr **xfrma) 1830 { 1831 return -ENOPROTOOPT; 1832 } 1833 #endif 1834 1835 #ifdef CONFIG_XFRM_MIGRATE 1836 static int copy_to_user_migrate(struct xfrm_migrate *m, struct sk_buff *skb) 1837 { 1838 struct xfrm_user_migrate um; 1839 1840 memset(&um, 0, sizeof(um)); 1841 um.proto = m->proto; 1842 um.mode = m->mode; 1843 um.reqid = m->reqid; 1844 um.old_family = m->old_family; 1845 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr)); 1846 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr)); 1847 um.new_family = m->new_family; 1848 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr)); 1849 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr)); 1850 1851 RTA_PUT(skb, XFRMA_MIGRATE, sizeof(um), &um); 1852 return 0; 1853 1854 rtattr_failure: 1855 return -1; 1856 } 1857 1858 static int build_migrate(struct sk_buff *skb, struct xfrm_migrate *m, 1859 int num_migrate, struct xfrm_selector *sel, 1860 u8 dir, u8 type) 1861 { 1862 struct xfrm_migrate *mp; 1863 struct xfrm_userpolicy_id *pol_id; 1864 struct nlmsghdr *nlh; 1865 unsigned char *b = skb_tail_pointer(skb); 1866 int i; 1867 1868 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0); 1869 if (nlh == NULL) 1870 return -EMSGSIZE; 1871 pol_id = NLMSG_DATA(nlh); 1872 1873 /* copy data from selector, dir, and type to the pol_id */ 1874 memset(pol_id, 0, sizeof(*pol_id)); 1875 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel)); 1876 pol_id->dir = dir; 1877 1878 if (copy_to_user_policy_type(type, skb) < 0) 1879 goto nlmsg_failure; 1880 1881 for (i = 0, mp = m ; i < num_migrate; i++, mp++) { 1882 if (copy_to_user_migrate(mp, skb) < 0) 1883 goto nlmsg_failure; 1884 } 1885 1886 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 1887 return skb->len; 1888 nlmsg_failure: 1889 nlmsg_trim(skb, b); 1890 return -1; 1891 } 1892 1893 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type, 1894 struct xfrm_migrate *m, int num_migrate) 1895 { 1896 struct sk_buff *skb; 1897 size_t len; 1898 1899 len = RTA_SPACE(sizeof(struct xfrm_user_migrate) * num_migrate); 1900 len += NLMSG_SPACE(sizeof(struct xfrm_userpolicy_id)); 1901 #ifdef CONFIG_XFRM_SUB_POLICY 1902 len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type)); 1903 #endif 1904 skb = alloc_skb(len, GFP_ATOMIC); 1905 if (skb == NULL) 1906 return -ENOMEM; 1907 1908 /* build migrate */ 1909 if (build_migrate(skb, m, num_migrate, sel, dir, type) < 0) 1910 BUG(); 1911 1912 NETLINK_CB(skb).dst_group = XFRMNLGRP_MIGRATE; 1913 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_MIGRATE, 1914 GFP_ATOMIC); 1915 } 1916 #else 1917 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type, 1918 struct xfrm_migrate *m, int num_migrate) 1919 { 1920 return -ENOPROTOOPT; 1921 } 1922 #endif 1923 1924 #define XMSGSIZE(type) NLMSG_LENGTH(sizeof(struct type)) 1925 1926 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = { 1927 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 1928 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 1929 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 1930 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 1931 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 1932 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 1933 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info), 1934 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire), 1935 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire), 1936 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 1937 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 1938 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire), 1939 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush), 1940 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = NLMSG_LENGTH(0), 1941 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 1942 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 1943 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report), 1944 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 1945 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = NLMSG_LENGTH(sizeof(u32)), 1946 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = NLMSG_LENGTH(sizeof(u32)), 1947 }; 1948 1949 #undef XMSGSIZE 1950 1951 static struct xfrm_link { 1952 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct rtattr **); 1953 int (*dump)(struct sk_buff *, struct netlink_callback *); 1954 } xfrm_dispatch[XFRM_NR_MSGTYPES] = { 1955 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 1956 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa }, 1957 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa, 1958 .dump = xfrm_dump_sa }, 1959 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 1960 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy }, 1961 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy, 1962 .dump = xfrm_dump_policy }, 1963 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi }, 1964 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire }, 1965 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire }, 1966 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 1967 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 1968 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire}, 1969 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa }, 1970 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy }, 1971 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae }, 1972 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae }, 1973 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate }, 1974 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo }, 1975 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo }, 1976 }; 1977 1978 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 1979 { 1980 struct rtattr *xfrma[XFRMA_MAX]; 1981 struct xfrm_link *link; 1982 int type, min_len; 1983 1984 type = nlh->nlmsg_type; 1985 if (type > XFRM_MSG_MAX) 1986 return -EINVAL; 1987 1988 type -= XFRM_MSG_BASE; 1989 link = &xfrm_dispatch[type]; 1990 1991 /* All operations require privileges, even GET */ 1992 if (security_netlink_recv(skb, CAP_NET_ADMIN)) 1993 return -EPERM; 1994 1995 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) || 1996 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) && 1997 (nlh->nlmsg_flags & NLM_F_DUMP)) { 1998 if (link->dump == NULL) 1999 return -EINVAL; 2000 2001 return netlink_dump_start(xfrm_nl, skb, nlh, link->dump, NULL); 2002 } 2003 2004 memset(xfrma, 0, sizeof(xfrma)); 2005 2006 if (nlh->nlmsg_len < (min_len = xfrm_msg_min[type])) 2007 return -EINVAL; 2008 2009 if (nlh->nlmsg_len > min_len) { 2010 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); 2011 struct rtattr *attr = (void *) nlh + NLMSG_ALIGN(min_len); 2012 2013 while (RTA_OK(attr, attrlen)) { 2014 unsigned short flavor = attr->rta_type; 2015 if (flavor) { 2016 if (flavor > XFRMA_MAX) 2017 return -EINVAL; 2018 xfrma[flavor - 1] = attr; 2019 } 2020 attr = RTA_NEXT(attr, attrlen); 2021 } 2022 } 2023 2024 if (link->doit == NULL) 2025 return -EINVAL; 2026 2027 return link->doit(skb, nlh, xfrma); 2028 } 2029 2030 static void xfrm_netlink_rcv(struct sock *sk, int len) 2031 { 2032 unsigned int qlen = 0; 2033 2034 do { 2035 mutex_lock(&xfrm_cfg_mutex); 2036 netlink_run_queue(sk, &qlen, &xfrm_user_rcv_msg); 2037 mutex_unlock(&xfrm_cfg_mutex); 2038 2039 } while (qlen); 2040 } 2041 2042 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c) 2043 { 2044 struct xfrm_user_expire *ue; 2045 struct nlmsghdr *nlh; 2046 unsigned char *b = skb_tail_pointer(skb); 2047 2048 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0); 2049 if (nlh == NULL) 2050 return -EMSGSIZE; 2051 ue = NLMSG_DATA(nlh); 2052 2053 copy_to_user_state(x, &ue->state); 2054 ue->hard = (c->data.hard != 0) ? 1 : 0; 2055 2056 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 2057 return skb->len; 2058 } 2059 2060 static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c) 2061 { 2062 struct sk_buff *skb; 2063 int len = NLMSG_LENGTH(sizeof(struct xfrm_user_expire)); 2064 2065 skb = alloc_skb(len, GFP_ATOMIC); 2066 if (skb == NULL) 2067 return -ENOMEM; 2068 2069 if (build_expire(skb, x, c) < 0) 2070 BUG(); 2071 2072 NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE; 2073 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC); 2074 } 2075 2076 static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c) 2077 { 2078 struct sk_buff *skb; 2079 int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id)); 2080 2081 len += RTA_SPACE(sizeof(struct xfrm_replay_state)); 2082 len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur)); 2083 skb = alloc_skb(len, GFP_ATOMIC); 2084 if (skb == NULL) 2085 return -ENOMEM; 2086 2087 if (build_aevent(skb, x, c) < 0) 2088 BUG(); 2089 2090 NETLINK_CB(skb).dst_group = XFRMNLGRP_AEVENTS; 2091 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC); 2092 } 2093 2094 static int xfrm_notify_sa_flush(struct km_event *c) 2095 { 2096 struct xfrm_usersa_flush *p; 2097 struct nlmsghdr *nlh; 2098 struct sk_buff *skb; 2099 sk_buff_data_t b; 2100 int len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_flush)); 2101 2102 skb = alloc_skb(len, GFP_ATOMIC); 2103 if (skb == NULL) 2104 return -ENOMEM; 2105 b = skb->tail; 2106 2107 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0); 2108 if (nlh == NULL) { 2109 kfree_skb(skb); 2110 return -EMSGSIZE; 2111 } 2112 2113 p = NLMSG_DATA(nlh); 2114 p->proto = c->data.proto; 2115 2116 nlh->nlmsg_len = skb->tail - b; 2117 2118 NETLINK_CB(skb).dst_group = XFRMNLGRP_SA; 2119 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC); 2120 } 2121 2122 static inline int xfrm_sa_len(struct xfrm_state *x) 2123 { 2124 int l = 0; 2125 if (x->aalg) 2126 l += RTA_SPACE(sizeof(*x->aalg) + (x->aalg->alg_key_len+7)/8); 2127 if (x->ealg) 2128 l += RTA_SPACE(sizeof(*x->ealg) + (x->ealg->alg_key_len+7)/8); 2129 if (x->calg) 2130 l += RTA_SPACE(sizeof(*x->calg)); 2131 if (x->encap) 2132 l += RTA_SPACE(sizeof(*x->encap)); 2133 2134 return l; 2135 } 2136 2137 static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c) 2138 { 2139 struct xfrm_usersa_info *p; 2140 struct xfrm_usersa_id *id; 2141 struct nlmsghdr *nlh; 2142 struct sk_buff *skb; 2143 sk_buff_data_t b; 2144 int len = xfrm_sa_len(x); 2145 int headlen; 2146 2147 headlen = sizeof(*p); 2148 if (c->event == XFRM_MSG_DELSA) { 2149 len += RTA_SPACE(headlen); 2150 headlen = sizeof(*id); 2151 } 2152 len += NLMSG_SPACE(headlen); 2153 2154 skb = alloc_skb(len, GFP_ATOMIC); 2155 if (skb == NULL) 2156 return -ENOMEM; 2157 b = skb->tail; 2158 2159 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0); 2160 if (nlh == NULL) 2161 goto nlmsg_failure; 2162 2163 p = NLMSG_DATA(nlh); 2164 if (c->event == XFRM_MSG_DELSA) { 2165 id = NLMSG_DATA(nlh); 2166 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr)); 2167 id->spi = x->id.spi; 2168 id->family = x->props.family; 2169 id->proto = x->id.proto; 2170 2171 p = RTA_DATA(__RTA_PUT(skb, XFRMA_SA, sizeof(*p))); 2172 } 2173 2174 copy_to_user_state(x, p); 2175 2176 if (x->aalg) 2177 RTA_PUT(skb, XFRMA_ALG_AUTH, 2178 sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg); 2179 if (x->ealg) 2180 RTA_PUT(skb, XFRMA_ALG_CRYPT, 2181 sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg); 2182 if (x->calg) 2183 RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg); 2184 2185 if (x->encap) 2186 RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap); 2187 2188 nlh->nlmsg_len = skb->tail - b; 2189 2190 NETLINK_CB(skb).dst_group = XFRMNLGRP_SA; 2191 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC); 2192 2193 nlmsg_failure: 2194 rtattr_failure: 2195 kfree_skb(skb); 2196 return -1; 2197 } 2198 2199 static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c) 2200 { 2201 2202 switch (c->event) { 2203 case XFRM_MSG_EXPIRE: 2204 return xfrm_exp_state_notify(x, c); 2205 case XFRM_MSG_NEWAE: 2206 return xfrm_aevent_state_notify(x, c); 2207 case XFRM_MSG_DELSA: 2208 case XFRM_MSG_UPDSA: 2209 case XFRM_MSG_NEWSA: 2210 return xfrm_notify_sa(x, c); 2211 case XFRM_MSG_FLUSHSA: 2212 return xfrm_notify_sa_flush(c); 2213 default: 2214 printk("xfrm_user: Unknown SA event %d\n", c->event); 2215 break; 2216 } 2217 2218 return 0; 2219 2220 } 2221 2222 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x, 2223 struct xfrm_tmpl *xt, struct xfrm_policy *xp, 2224 int dir) 2225 { 2226 struct xfrm_user_acquire *ua; 2227 struct nlmsghdr *nlh; 2228 unsigned char *b = skb_tail_pointer(skb); 2229 __u32 seq = xfrm_get_acqseq(); 2230 2231 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0); 2232 if (nlh == NULL) 2233 return -EMSGSIZE; 2234 ua = NLMSG_DATA(nlh); 2235 2236 memcpy(&ua->id, &x->id, sizeof(ua->id)); 2237 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr)); 2238 memcpy(&ua->sel, &x->sel, sizeof(ua->sel)); 2239 copy_to_user_policy(xp, &ua->policy, dir); 2240 ua->aalgos = xt->aalgos; 2241 ua->ealgos = xt->ealgos; 2242 ua->calgos = xt->calgos; 2243 ua->seq = x->km.seq = seq; 2244 2245 if (copy_to_user_tmpl(xp, skb) < 0) 2246 goto nlmsg_failure; 2247 if (copy_to_user_state_sec_ctx(x, skb)) 2248 goto nlmsg_failure; 2249 if (copy_to_user_policy_type(xp->type, skb) < 0) 2250 goto nlmsg_failure; 2251 2252 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 2253 return skb->len; 2254 2255 nlmsg_failure: 2256 nlmsg_trim(skb, b); 2257 return -1; 2258 } 2259 2260 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt, 2261 struct xfrm_policy *xp, int dir) 2262 { 2263 struct sk_buff *skb; 2264 size_t len; 2265 2266 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); 2267 len += NLMSG_SPACE(sizeof(struct xfrm_user_acquire)); 2268 len += RTA_SPACE(xfrm_user_sec_ctx_size(x->security)); 2269 #ifdef CONFIG_XFRM_SUB_POLICY 2270 len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type)); 2271 #endif 2272 skb = alloc_skb(len, GFP_ATOMIC); 2273 if (skb == NULL) 2274 return -ENOMEM; 2275 2276 if (build_acquire(skb, x, xt, xp, dir) < 0) 2277 BUG(); 2278 2279 NETLINK_CB(skb).dst_group = XFRMNLGRP_ACQUIRE; 2280 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC); 2281 } 2282 2283 /* User gives us xfrm_user_policy_info followed by an array of 0 2284 * or more templates. 2285 */ 2286 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt, 2287 u8 *data, int len, int *dir) 2288 { 2289 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data; 2290 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1); 2291 struct xfrm_policy *xp; 2292 int nr; 2293 2294 switch (sk->sk_family) { 2295 case AF_INET: 2296 if (opt != IP_XFRM_POLICY) { 2297 *dir = -EOPNOTSUPP; 2298 return NULL; 2299 } 2300 break; 2301 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 2302 case AF_INET6: 2303 if (opt != IPV6_XFRM_POLICY) { 2304 *dir = -EOPNOTSUPP; 2305 return NULL; 2306 } 2307 break; 2308 #endif 2309 default: 2310 *dir = -EINVAL; 2311 return NULL; 2312 } 2313 2314 *dir = -EINVAL; 2315 2316 if (len < sizeof(*p) || 2317 verify_newpolicy_info(p)) 2318 return NULL; 2319 2320 nr = ((len - sizeof(*p)) / sizeof(*ut)); 2321 if (validate_tmpl(nr, ut, p->sel.family)) 2322 return NULL; 2323 2324 if (p->dir > XFRM_POLICY_OUT) 2325 return NULL; 2326 2327 xp = xfrm_policy_alloc(GFP_KERNEL); 2328 if (xp == NULL) { 2329 *dir = -ENOBUFS; 2330 return NULL; 2331 } 2332 2333 copy_from_user_policy(xp, p); 2334 xp->type = XFRM_POLICY_TYPE_MAIN; 2335 copy_templates(xp, ut, nr); 2336 2337 *dir = p->dir; 2338 2339 return xp; 2340 } 2341 2342 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp, 2343 int dir, struct km_event *c) 2344 { 2345 struct xfrm_user_polexpire *upe; 2346 struct nlmsghdr *nlh; 2347 int hard = c->data.hard; 2348 unsigned char *b = skb_tail_pointer(skb); 2349 2350 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0); 2351 if (nlh == NULL) 2352 return -EMSGSIZE; 2353 upe = NLMSG_DATA(nlh); 2354 2355 copy_to_user_policy(xp, &upe->pol, dir); 2356 if (copy_to_user_tmpl(xp, skb) < 0) 2357 goto nlmsg_failure; 2358 if (copy_to_user_sec_ctx(xp, skb)) 2359 goto nlmsg_failure; 2360 if (copy_to_user_policy_type(xp->type, skb) < 0) 2361 goto nlmsg_failure; 2362 upe->hard = !!hard; 2363 2364 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 2365 return skb->len; 2366 2367 nlmsg_failure: 2368 nlmsg_trim(skb, b); 2369 return -1; 2370 } 2371 2372 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) 2373 { 2374 struct sk_buff *skb; 2375 size_t len; 2376 2377 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); 2378 len += NLMSG_SPACE(sizeof(struct xfrm_user_polexpire)); 2379 len += RTA_SPACE(xfrm_user_sec_ctx_size(xp->security)); 2380 #ifdef CONFIG_XFRM_SUB_POLICY 2381 len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type)); 2382 #endif 2383 skb = alloc_skb(len, GFP_ATOMIC); 2384 if (skb == NULL) 2385 return -ENOMEM; 2386 2387 if (build_polexpire(skb, xp, dir, c) < 0) 2388 BUG(); 2389 2390 NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE; 2391 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC); 2392 } 2393 2394 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c) 2395 { 2396 struct xfrm_userpolicy_info *p; 2397 struct xfrm_userpolicy_id *id; 2398 struct nlmsghdr *nlh; 2399 struct sk_buff *skb; 2400 sk_buff_data_t b; 2401 int len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); 2402 int headlen; 2403 2404 headlen = sizeof(*p); 2405 if (c->event == XFRM_MSG_DELPOLICY) { 2406 len += RTA_SPACE(headlen); 2407 headlen = sizeof(*id); 2408 } 2409 #ifdef CONFIG_XFRM_SUB_POLICY 2410 len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type)); 2411 #endif 2412 len += NLMSG_SPACE(headlen); 2413 2414 skb = alloc_skb(len, GFP_ATOMIC); 2415 if (skb == NULL) 2416 return -ENOMEM; 2417 b = skb->tail; 2418 2419 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0); 2420 if (nlh == NULL) 2421 goto nlmsg_failure; 2422 2423 p = NLMSG_DATA(nlh); 2424 if (c->event == XFRM_MSG_DELPOLICY) { 2425 id = NLMSG_DATA(nlh); 2426 memset(id, 0, sizeof(*id)); 2427 id->dir = dir; 2428 if (c->data.byid) 2429 id->index = xp->index; 2430 else 2431 memcpy(&id->sel, &xp->selector, sizeof(id->sel)); 2432 2433 p = RTA_DATA(__RTA_PUT(skb, XFRMA_POLICY, sizeof(*p))); 2434 } 2435 2436 copy_to_user_policy(xp, p, dir); 2437 if (copy_to_user_tmpl(xp, skb) < 0) 2438 goto nlmsg_failure; 2439 if (copy_to_user_policy_type(xp->type, skb) < 0) 2440 goto nlmsg_failure; 2441 2442 nlh->nlmsg_len = skb->tail - b; 2443 2444 NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY; 2445 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC); 2446 2447 nlmsg_failure: 2448 rtattr_failure: 2449 kfree_skb(skb); 2450 return -1; 2451 } 2452 2453 static int xfrm_notify_policy_flush(struct km_event *c) 2454 { 2455 struct nlmsghdr *nlh; 2456 struct sk_buff *skb; 2457 sk_buff_data_t b; 2458 int len = 0; 2459 #ifdef CONFIG_XFRM_SUB_POLICY 2460 len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type)); 2461 #endif 2462 len += NLMSG_LENGTH(0); 2463 2464 skb = alloc_skb(len, GFP_ATOMIC); 2465 if (skb == NULL) 2466 return -ENOMEM; 2467 b = skb->tail; 2468 2469 2470 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0); 2471 if (nlh == NULL) 2472 goto nlmsg_failure; 2473 if (copy_to_user_policy_type(c->data.type, skb) < 0) 2474 goto nlmsg_failure; 2475 2476 nlh->nlmsg_len = skb->tail - b; 2477 2478 NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY; 2479 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC); 2480 2481 nlmsg_failure: 2482 kfree_skb(skb); 2483 return -1; 2484 } 2485 2486 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) 2487 { 2488 2489 switch (c->event) { 2490 case XFRM_MSG_NEWPOLICY: 2491 case XFRM_MSG_UPDPOLICY: 2492 case XFRM_MSG_DELPOLICY: 2493 return xfrm_notify_policy(xp, dir, c); 2494 case XFRM_MSG_FLUSHPOLICY: 2495 return xfrm_notify_policy_flush(c); 2496 case XFRM_MSG_POLEXPIRE: 2497 return xfrm_exp_policy_notify(xp, dir, c); 2498 default: 2499 printk("xfrm_user: Unknown Policy event %d\n", c->event); 2500 } 2501 2502 return 0; 2503 2504 } 2505 2506 static int build_report(struct sk_buff *skb, u8 proto, 2507 struct xfrm_selector *sel, xfrm_address_t *addr) 2508 { 2509 struct xfrm_user_report *ur; 2510 struct nlmsghdr *nlh; 2511 unsigned char *b = skb_tail_pointer(skb); 2512 2513 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0); 2514 if (nlh == NULL) 2515 return -EMSGSIZE; 2516 ur = NLMSG_DATA(nlh); 2517 2518 ur->proto = proto; 2519 memcpy(&ur->sel, sel, sizeof(ur->sel)); 2520 2521 if (addr) 2522 RTA_PUT(skb, XFRMA_COADDR, sizeof(*addr), addr); 2523 2524 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 2525 return skb->len; 2526 2527 rtattr_failure: 2528 nlmsg_trim(skb, b); 2529 return -1; 2530 } 2531 2532 static int xfrm_send_report(u8 proto, struct xfrm_selector *sel, 2533 xfrm_address_t *addr) 2534 { 2535 struct sk_buff *skb; 2536 size_t len; 2537 2538 len = NLMSG_ALIGN(NLMSG_LENGTH(sizeof(struct xfrm_user_report))); 2539 skb = alloc_skb(len, GFP_ATOMIC); 2540 if (skb == NULL) 2541 return -ENOMEM; 2542 2543 if (build_report(skb, proto, sel, addr) < 0) 2544 BUG(); 2545 2546 NETLINK_CB(skb).dst_group = XFRMNLGRP_REPORT; 2547 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC); 2548 } 2549 2550 static struct xfrm_mgr netlink_mgr = { 2551 .id = "netlink", 2552 .notify = xfrm_send_state_notify, 2553 .acquire = xfrm_send_acquire, 2554 .compile_policy = xfrm_compile_policy, 2555 .notify_policy = xfrm_send_policy_notify, 2556 .report = xfrm_send_report, 2557 .migrate = xfrm_send_migrate, 2558 }; 2559 2560 static int __init xfrm_user_init(void) 2561 { 2562 struct sock *nlsk; 2563 2564 printk(KERN_INFO "Initializing XFRM netlink socket\n"); 2565 2566 nlsk = netlink_kernel_create(NETLINK_XFRM, XFRMNLGRP_MAX, 2567 xfrm_netlink_rcv, NULL, THIS_MODULE); 2568 if (nlsk == NULL) 2569 return -ENOMEM; 2570 rcu_assign_pointer(xfrm_nl, nlsk); 2571 2572 xfrm_register_km(&netlink_mgr); 2573 2574 return 0; 2575 } 2576 2577 static void __exit xfrm_user_exit(void) 2578 { 2579 struct sock *nlsk = xfrm_nl; 2580 2581 xfrm_unregister_km(&netlink_mgr); 2582 rcu_assign_pointer(xfrm_nl, NULL); 2583 synchronize_rcu(); 2584 sock_release(nlsk->sk_socket); 2585 } 2586 2587 module_init(xfrm_user_init); 2588 module_exit(xfrm_user_exit); 2589 MODULE_LICENSE("GPL"); 2590 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM); 2591 2592