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