1 /* xfrm_user.c: User interface to configure xfrm engine. 2 * 3 * Copyright (C) 2002 David S. Miller (davem@redhat.com) 4 * 5 * Changes: 6 * Mitsuru KANDA @USAGI 7 * Kazunori MIYAZAWA @USAGI 8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com> 9 * IPv6 support 10 * 11 */ 12 13 #include <linux/crypto.h> 14 #include <linux/module.h> 15 #include <linux/kernel.h> 16 #include <linux/types.h> 17 #include <linux/slab.h> 18 #include <linux/socket.h> 19 #include <linux/string.h> 20 #include <linux/net.h> 21 #include <linux/skbuff.h> 22 #include <linux/pfkeyv2.h> 23 #include <linux/ipsec.h> 24 #include <linux/init.h> 25 #include <linux/security.h> 26 #include <net/sock.h> 27 #include <net/xfrm.h> 28 #include <net/netlink.h> 29 #include <asm/uaccess.h> 30 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 31 #include <linux/in6.h> 32 #endif 33 34 static inline int aead_len(struct xfrm_algo_aead *alg) 35 { 36 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 37 } 38 39 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type) 40 { 41 struct nlattr *rt = attrs[type]; 42 struct xfrm_algo *algp; 43 44 if (!rt) 45 return 0; 46 47 algp = nla_data(rt); 48 if (nla_len(rt) < xfrm_alg_len(algp)) 49 return -EINVAL; 50 51 switch (type) { 52 case XFRMA_ALG_AUTH: 53 case XFRMA_ALG_CRYPT: 54 case XFRMA_ALG_COMP: 55 break; 56 57 default: 58 return -EINVAL; 59 } 60 61 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; 62 return 0; 63 } 64 65 static int verify_auth_trunc(struct nlattr **attrs) 66 { 67 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC]; 68 struct xfrm_algo_auth *algp; 69 70 if (!rt) 71 return 0; 72 73 algp = nla_data(rt); 74 if (nla_len(rt) < xfrm_alg_auth_len(algp)) 75 return -EINVAL; 76 77 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; 78 return 0; 79 } 80 81 static int verify_aead(struct nlattr **attrs) 82 { 83 struct nlattr *rt = attrs[XFRMA_ALG_AEAD]; 84 struct xfrm_algo_aead *algp; 85 86 if (!rt) 87 return 0; 88 89 algp = nla_data(rt); 90 if (nla_len(rt) < aead_len(algp)) 91 return -EINVAL; 92 93 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; 94 return 0; 95 } 96 97 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type, 98 xfrm_address_t **addrp) 99 { 100 struct nlattr *rt = attrs[type]; 101 102 if (rt && addrp) 103 *addrp = nla_data(rt); 104 } 105 106 static inline int verify_sec_ctx_len(struct nlattr **attrs) 107 { 108 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 109 struct xfrm_user_sec_ctx *uctx; 110 111 if (!rt) 112 return 0; 113 114 uctx = nla_data(rt); 115 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len)) 116 return -EINVAL; 117 118 return 0; 119 } 120 121 122 static int verify_newsa_info(struct xfrm_usersa_info *p, 123 struct nlattr **attrs) 124 { 125 int err; 126 127 err = -EINVAL; 128 switch (p->family) { 129 case AF_INET: 130 break; 131 132 case AF_INET6: 133 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 134 break; 135 #else 136 err = -EAFNOSUPPORT; 137 goto out; 138 #endif 139 140 default: 141 goto out; 142 } 143 144 err = -EINVAL; 145 switch (p->id.proto) { 146 case IPPROTO_AH: 147 if ((!attrs[XFRMA_ALG_AUTH] && 148 !attrs[XFRMA_ALG_AUTH_TRUNC]) || 149 attrs[XFRMA_ALG_AEAD] || 150 attrs[XFRMA_ALG_CRYPT] || 151 attrs[XFRMA_ALG_COMP]) 152 goto out; 153 break; 154 155 case IPPROTO_ESP: 156 if (attrs[XFRMA_ALG_COMP]) 157 goto out; 158 if (!attrs[XFRMA_ALG_AUTH] && 159 !attrs[XFRMA_ALG_AUTH_TRUNC] && 160 !attrs[XFRMA_ALG_CRYPT] && 161 !attrs[XFRMA_ALG_AEAD]) 162 goto out; 163 if ((attrs[XFRMA_ALG_AUTH] || 164 attrs[XFRMA_ALG_AUTH_TRUNC] || 165 attrs[XFRMA_ALG_CRYPT]) && 166 attrs[XFRMA_ALG_AEAD]) 167 goto out; 168 break; 169 170 case IPPROTO_COMP: 171 if (!attrs[XFRMA_ALG_COMP] || 172 attrs[XFRMA_ALG_AEAD] || 173 attrs[XFRMA_ALG_AUTH] || 174 attrs[XFRMA_ALG_AUTH_TRUNC] || 175 attrs[XFRMA_ALG_CRYPT]) 176 goto out; 177 break; 178 179 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 180 case IPPROTO_DSTOPTS: 181 case IPPROTO_ROUTING: 182 if (attrs[XFRMA_ALG_COMP] || 183 attrs[XFRMA_ALG_AUTH] || 184 attrs[XFRMA_ALG_AUTH_TRUNC] || 185 attrs[XFRMA_ALG_AEAD] || 186 attrs[XFRMA_ALG_CRYPT] || 187 attrs[XFRMA_ENCAP] || 188 attrs[XFRMA_SEC_CTX] || 189 !attrs[XFRMA_COADDR]) 190 goto out; 191 break; 192 #endif 193 194 default: 195 goto out; 196 } 197 198 if ((err = verify_aead(attrs))) 199 goto out; 200 if ((err = verify_auth_trunc(attrs))) 201 goto out; 202 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH))) 203 goto out; 204 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT))) 205 goto out; 206 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP))) 207 goto out; 208 if ((err = verify_sec_ctx_len(attrs))) 209 goto out; 210 211 err = -EINVAL; 212 switch (p->mode) { 213 case XFRM_MODE_TRANSPORT: 214 case XFRM_MODE_TUNNEL: 215 case XFRM_MODE_ROUTEOPTIMIZATION: 216 case XFRM_MODE_BEET: 217 break; 218 219 default: 220 goto out; 221 } 222 223 err = 0; 224 225 out: 226 return err; 227 } 228 229 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props, 230 struct xfrm_algo_desc *(*get_byname)(char *, int), 231 struct nlattr *rta) 232 { 233 struct xfrm_algo *p, *ualg; 234 struct xfrm_algo_desc *algo; 235 236 if (!rta) 237 return 0; 238 239 ualg = nla_data(rta); 240 241 algo = get_byname(ualg->alg_name, 1); 242 if (!algo) 243 return -ENOSYS; 244 *props = algo->desc.sadb_alg_id; 245 246 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL); 247 if (!p) 248 return -ENOMEM; 249 250 strcpy(p->alg_name, algo->name); 251 *algpp = p; 252 return 0; 253 } 254 255 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props, 256 struct nlattr *rta) 257 { 258 struct xfrm_algo *ualg; 259 struct xfrm_algo_auth *p; 260 struct xfrm_algo_desc *algo; 261 262 if (!rta) 263 return 0; 264 265 ualg = nla_data(rta); 266 267 algo = xfrm_aalg_get_byname(ualg->alg_name, 1); 268 if (!algo) 269 return -ENOSYS; 270 *props = algo->desc.sadb_alg_id; 271 272 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL); 273 if (!p) 274 return -ENOMEM; 275 276 strcpy(p->alg_name, algo->name); 277 p->alg_key_len = ualg->alg_key_len; 278 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; 279 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8); 280 281 *algpp = p; 282 return 0; 283 } 284 285 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props, 286 struct nlattr *rta) 287 { 288 struct xfrm_algo_auth *p, *ualg; 289 struct xfrm_algo_desc *algo; 290 291 if (!rta) 292 return 0; 293 294 ualg = nla_data(rta); 295 296 algo = xfrm_aalg_get_byname(ualg->alg_name, 1); 297 if (!algo) 298 return -ENOSYS; 299 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits) 300 return -EINVAL; 301 *props = algo->desc.sadb_alg_id; 302 303 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL); 304 if (!p) 305 return -ENOMEM; 306 307 strcpy(p->alg_name, algo->name); 308 if (!p->alg_trunc_len) 309 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; 310 311 *algpp = p; 312 return 0; 313 } 314 315 static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props, 316 struct nlattr *rta) 317 { 318 struct xfrm_algo_aead *p, *ualg; 319 struct xfrm_algo_desc *algo; 320 321 if (!rta) 322 return 0; 323 324 ualg = nla_data(rta); 325 326 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1); 327 if (!algo) 328 return -ENOSYS; 329 *props = algo->desc.sadb_alg_id; 330 331 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL); 332 if (!p) 333 return -ENOMEM; 334 335 strcpy(p->alg_name, algo->name); 336 *algpp = p; 337 return 0; 338 } 339 340 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx) 341 { 342 int len = 0; 343 344 if (xfrm_ctx) { 345 len += sizeof(struct xfrm_user_sec_ctx); 346 len += xfrm_ctx->ctx_len; 347 } 348 return len; 349 } 350 351 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 352 { 353 memcpy(&x->id, &p->id, sizeof(x->id)); 354 memcpy(&x->sel, &p->sel, sizeof(x->sel)); 355 memcpy(&x->lft, &p->lft, sizeof(x->lft)); 356 x->props.mode = p->mode; 357 x->props.replay_window = p->replay_window; 358 x->props.reqid = p->reqid; 359 x->props.family = p->family; 360 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr)); 361 x->props.flags = p->flags; 362 363 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC)) 364 x->sel.family = p->family; 365 } 366 367 /* 368 * someday when pfkey also has support, we could have the code 369 * somehow made shareable and move it to xfrm_state.c - JHS 370 * 371 */ 372 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs) 373 { 374 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 375 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 376 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; 377 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; 378 379 if (rp) { 380 struct xfrm_replay_state *replay; 381 replay = nla_data(rp); 382 memcpy(&x->replay, replay, sizeof(*replay)); 383 memcpy(&x->preplay, replay, sizeof(*replay)); 384 } 385 386 if (lt) { 387 struct xfrm_lifetime_cur *ltime; 388 ltime = nla_data(lt); 389 x->curlft.bytes = ltime->bytes; 390 x->curlft.packets = ltime->packets; 391 x->curlft.add_time = ltime->add_time; 392 x->curlft.use_time = ltime->use_time; 393 } 394 395 if (et) 396 x->replay_maxage = nla_get_u32(et); 397 398 if (rt) 399 x->replay_maxdiff = nla_get_u32(rt); 400 } 401 402 static struct xfrm_state *xfrm_state_construct(struct net *net, 403 struct xfrm_usersa_info *p, 404 struct nlattr **attrs, 405 int *errp) 406 { 407 struct xfrm_state *x = xfrm_state_alloc(net); 408 int err = -ENOMEM; 409 410 if (!x) 411 goto error_no_put; 412 413 copy_from_user_state(x, p); 414 415 if ((err = attach_aead(&x->aead, &x->props.ealgo, 416 attrs[XFRMA_ALG_AEAD]))) 417 goto error; 418 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo, 419 attrs[XFRMA_ALG_AUTH_TRUNC]))) 420 goto error; 421 if (!x->props.aalgo) { 422 if ((err = attach_auth(&x->aalg, &x->props.aalgo, 423 attrs[XFRMA_ALG_AUTH]))) 424 goto error; 425 } 426 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo, 427 xfrm_ealg_get_byname, 428 attrs[XFRMA_ALG_CRYPT]))) 429 goto error; 430 if ((err = attach_one_algo(&x->calg, &x->props.calgo, 431 xfrm_calg_get_byname, 432 attrs[XFRMA_ALG_COMP]))) 433 goto error; 434 435 if (attrs[XFRMA_ENCAP]) { 436 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]), 437 sizeof(*x->encap), GFP_KERNEL); 438 if (x->encap == NULL) 439 goto error; 440 } 441 442 if (attrs[XFRMA_COADDR]) { 443 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]), 444 sizeof(*x->coaddr), GFP_KERNEL); 445 if (x->coaddr == NULL) 446 goto error; 447 } 448 449 xfrm_mark_get(attrs, &x->mark); 450 451 err = xfrm_init_state(x); 452 if (err) 453 goto error; 454 455 if (attrs[XFRMA_SEC_CTX] && 456 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX]))) 457 goto error; 458 459 x->km.seq = p->seq; 460 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth; 461 /* sysctl_xfrm_aevent_etime is in 100ms units */ 462 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M; 463 x->preplay.bitmap = 0; 464 x->preplay.seq = x->replay.seq+x->replay_maxdiff; 465 x->preplay.oseq = x->replay.oseq +x->replay_maxdiff; 466 467 /* override default values from above */ 468 469 xfrm_update_ae_params(x, attrs); 470 471 return x; 472 473 error: 474 x->km.state = XFRM_STATE_DEAD; 475 xfrm_state_put(x); 476 error_no_put: 477 *errp = err; 478 return NULL; 479 } 480 481 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 482 struct nlattr **attrs) 483 { 484 struct net *net = sock_net(skb->sk); 485 struct xfrm_usersa_info *p = nlmsg_data(nlh); 486 struct xfrm_state *x; 487 int err; 488 struct km_event c; 489 uid_t loginuid = NETLINK_CB(skb).loginuid; 490 u32 sessionid = NETLINK_CB(skb).sessionid; 491 u32 sid = NETLINK_CB(skb).sid; 492 493 err = verify_newsa_info(p, attrs); 494 if (err) 495 return err; 496 497 x = xfrm_state_construct(net, p, attrs, &err); 498 if (!x) 499 return err; 500 501 xfrm_state_hold(x); 502 if (nlh->nlmsg_type == XFRM_MSG_NEWSA) 503 err = xfrm_state_add(x); 504 else 505 err = xfrm_state_update(x); 506 507 xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid); 508 509 if (err < 0) { 510 x->km.state = XFRM_STATE_DEAD; 511 __xfrm_state_put(x); 512 goto out; 513 } 514 515 c.seq = nlh->nlmsg_seq; 516 c.pid = nlh->nlmsg_pid; 517 c.event = nlh->nlmsg_type; 518 519 km_state_notify(x, &c); 520 out: 521 xfrm_state_put(x); 522 return err; 523 } 524 525 static struct xfrm_state *xfrm_user_state_lookup(struct net *net, 526 struct xfrm_usersa_id *p, 527 struct nlattr **attrs, 528 int *errp) 529 { 530 struct xfrm_state *x = NULL; 531 struct xfrm_mark m; 532 int err; 533 u32 mark = xfrm_mark_get(attrs, &m); 534 535 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) { 536 err = -ESRCH; 537 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family); 538 } else { 539 xfrm_address_t *saddr = NULL; 540 541 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr); 542 if (!saddr) { 543 err = -EINVAL; 544 goto out; 545 } 546 547 err = -ESRCH; 548 x = xfrm_state_lookup_byaddr(net, mark, 549 &p->daddr, saddr, 550 p->proto, p->family); 551 } 552 553 out: 554 if (!x && errp) 555 *errp = err; 556 return x; 557 } 558 559 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 560 struct nlattr **attrs) 561 { 562 struct net *net = sock_net(skb->sk); 563 struct xfrm_state *x; 564 int err = -ESRCH; 565 struct km_event c; 566 struct xfrm_usersa_id *p = nlmsg_data(nlh); 567 uid_t loginuid = NETLINK_CB(skb).loginuid; 568 u32 sessionid = NETLINK_CB(skb).sessionid; 569 u32 sid = NETLINK_CB(skb).sid; 570 571 x = xfrm_user_state_lookup(net, p, attrs, &err); 572 if (x == NULL) 573 return err; 574 575 if ((err = security_xfrm_state_delete(x)) != 0) 576 goto out; 577 578 if (xfrm_state_kern(x)) { 579 err = -EPERM; 580 goto out; 581 } 582 583 err = xfrm_state_delete(x); 584 585 if (err < 0) 586 goto out; 587 588 c.seq = nlh->nlmsg_seq; 589 c.pid = nlh->nlmsg_pid; 590 c.event = nlh->nlmsg_type; 591 km_state_notify(x, &c); 592 593 out: 594 xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid); 595 xfrm_state_put(x); 596 return err; 597 } 598 599 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) 600 { 601 memcpy(&p->id, &x->id, sizeof(p->id)); 602 memcpy(&p->sel, &x->sel, sizeof(p->sel)); 603 memcpy(&p->lft, &x->lft, sizeof(p->lft)); 604 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft)); 605 memcpy(&p->stats, &x->stats, sizeof(p->stats)); 606 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr)); 607 p->mode = x->props.mode; 608 p->replay_window = x->props.replay_window; 609 p->reqid = x->props.reqid; 610 p->family = x->props.family; 611 p->flags = x->props.flags; 612 p->seq = x->km.seq; 613 } 614 615 struct xfrm_dump_info { 616 struct sk_buff *in_skb; 617 struct sk_buff *out_skb; 618 u32 nlmsg_seq; 619 u16 nlmsg_flags; 620 }; 621 622 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb) 623 { 624 struct xfrm_user_sec_ctx *uctx; 625 struct nlattr *attr; 626 int ctx_size = sizeof(*uctx) + s->ctx_len; 627 628 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size); 629 if (attr == NULL) 630 return -EMSGSIZE; 631 632 uctx = nla_data(attr); 633 uctx->exttype = XFRMA_SEC_CTX; 634 uctx->len = ctx_size; 635 uctx->ctx_doi = s->ctx_doi; 636 uctx->ctx_alg = s->ctx_alg; 637 uctx->ctx_len = s->ctx_len; 638 memcpy(uctx + 1, s->ctx_str, s->ctx_len); 639 640 return 0; 641 } 642 643 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb) 644 { 645 struct xfrm_algo *algo; 646 struct nlattr *nla; 647 648 nla = nla_reserve(skb, XFRMA_ALG_AUTH, 649 sizeof(*algo) + (auth->alg_key_len + 7) / 8); 650 if (!nla) 651 return -EMSGSIZE; 652 653 algo = nla_data(nla); 654 strcpy(algo->alg_name, auth->alg_name); 655 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8); 656 algo->alg_key_len = auth->alg_key_len; 657 658 return 0; 659 } 660 661 /* Don't change this without updating xfrm_sa_len! */ 662 static int copy_to_user_state_extra(struct xfrm_state *x, 663 struct xfrm_usersa_info *p, 664 struct sk_buff *skb) 665 { 666 copy_to_user_state(x, p); 667 668 if (x->coaddr) 669 NLA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr); 670 671 if (x->lastused) 672 NLA_PUT_U64(skb, XFRMA_LASTUSED, x->lastused); 673 674 if (x->aead) 675 NLA_PUT(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead); 676 if (x->aalg) { 677 if (copy_to_user_auth(x->aalg, skb)) 678 goto nla_put_failure; 679 680 NLA_PUT(skb, XFRMA_ALG_AUTH_TRUNC, 681 xfrm_alg_auth_len(x->aalg), x->aalg); 682 } 683 if (x->ealg) 684 NLA_PUT(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg); 685 if (x->calg) 686 NLA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg); 687 688 if (x->encap) 689 NLA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap); 690 691 if (xfrm_mark_put(skb, &x->mark)) 692 goto nla_put_failure; 693 694 if (x->security && copy_sec_ctx(x->security, skb) < 0) 695 goto nla_put_failure; 696 697 return 0; 698 699 nla_put_failure: 700 return -EMSGSIZE; 701 } 702 703 static int dump_one_state(struct xfrm_state *x, int count, void *ptr) 704 { 705 struct xfrm_dump_info *sp = ptr; 706 struct sk_buff *in_skb = sp->in_skb; 707 struct sk_buff *skb = sp->out_skb; 708 struct xfrm_usersa_info *p; 709 struct nlmsghdr *nlh; 710 int err; 711 712 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq, 713 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags); 714 if (nlh == NULL) 715 return -EMSGSIZE; 716 717 p = nlmsg_data(nlh); 718 719 err = copy_to_user_state_extra(x, p, skb); 720 if (err) 721 goto nla_put_failure; 722 723 nlmsg_end(skb, nlh); 724 return 0; 725 726 nla_put_failure: 727 nlmsg_cancel(skb, nlh); 728 return err; 729 } 730 731 static int xfrm_dump_sa_done(struct netlink_callback *cb) 732 { 733 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 734 xfrm_state_walk_done(walk); 735 return 0; 736 } 737 738 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb) 739 { 740 struct net *net = sock_net(skb->sk); 741 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; 742 struct xfrm_dump_info info; 743 744 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) > 745 sizeof(cb->args) - sizeof(cb->args[0])); 746 747 info.in_skb = cb->skb; 748 info.out_skb = skb; 749 info.nlmsg_seq = cb->nlh->nlmsg_seq; 750 info.nlmsg_flags = NLM_F_MULTI; 751 752 if (!cb->args[0]) { 753 cb->args[0] = 1; 754 xfrm_state_walk_init(walk, 0); 755 } 756 757 (void) xfrm_state_walk(net, walk, dump_one_state, &info); 758 759 return skb->len; 760 } 761 762 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb, 763 struct xfrm_state *x, u32 seq) 764 { 765 struct xfrm_dump_info info; 766 struct sk_buff *skb; 767 768 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 769 if (!skb) 770 return ERR_PTR(-ENOMEM); 771 772 info.in_skb = in_skb; 773 info.out_skb = skb; 774 info.nlmsg_seq = seq; 775 info.nlmsg_flags = 0; 776 777 if (dump_one_state(x, 0, &info)) { 778 kfree_skb(skb); 779 return NULL; 780 } 781 782 return skb; 783 } 784 785 static inline size_t xfrm_spdinfo_msgsize(void) 786 { 787 return NLMSG_ALIGN(4) 788 + nla_total_size(sizeof(struct xfrmu_spdinfo)) 789 + nla_total_size(sizeof(struct xfrmu_spdhinfo)); 790 } 791 792 static int build_spdinfo(struct sk_buff *skb, struct net *net, 793 u32 pid, u32 seq, u32 flags) 794 { 795 struct xfrmk_spdinfo si; 796 struct xfrmu_spdinfo spc; 797 struct xfrmu_spdhinfo sph; 798 struct nlmsghdr *nlh; 799 u32 *f; 800 801 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0); 802 if (nlh == NULL) /* shouldnt really happen ... */ 803 return -EMSGSIZE; 804 805 f = nlmsg_data(nlh); 806 *f = flags; 807 xfrm_spd_getinfo(net, &si); 808 spc.incnt = si.incnt; 809 spc.outcnt = si.outcnt; 810 spc.fwdcnt = si.fwdcnt; 811 spc.inscnt = si.inscnt; 812 spc.outscnt = si.outscnt; 813 spc.fwdscnt = si.fwdscnt; 814 sph.spdhcnt = si.spdhcnt; 815 sph.spdhmcnt = si.spdhmcnt; 816 817 NLA_PUT(skb, XFRMA_SPD_INFO, sizeof(spc), &spc); 818 NLA_PUT(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph); 819 820 return nlmsg_end(skb, nlh); 821 822 nla_put_failure: 823 nlmsg_cancel(skb, nlh); 824 return -EMSGSIZE; 825 } 826 827 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 828 struct nlattr **attrs) 829 { 830 struct net *net = sock_net(skb->sk); 831 struct sk_buff *r_skb; 832 u32 *flags = nlmsg_data(nlh); 833 u32 spid = NETLINK_CB(skb).pid; 834 u32 seq = nlh->nlmsg_seq; 835 836 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC); 837 if (r_skb == NULL) 838 return -ENOMEM; 839 840 if (build_spdinfo(r_skb, net, spid, seq, *flags) < 0) 841 BUG(); 842 843 return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid); 844 } 845 846 static inline size_t xfrm_sadinfo_msgsize(void) 847 { 848 return NLMSG_ALIGN(4) 849 + nla_total_size(sizeof(struct xfrmu_sadhinfo)) 850 + nla_total_size(4); /* XFRMA_SAD_CNT */ 851 } 852 853 static int build_sadinfo(struct sk_buff *skb, struct net *net, 854 u32 pid, u32 seq, u32 flags) 855 { 856 struct xfrmk_sadinfo si; 857 struct xfrmu_sadhinfo sh; 858 struct nlmsghdr *nlh; 859 u32 *f; 860 861 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0); 862 if (nlh == NULL) /* shouldnt really happen ... */ 863 return -EMSGSIZE; 864 865 f = nlmsg_data(nlh); 866 *f = flags; 867 xfrm_sad_getinfo(net, &si); 868 869 sh.sadhmcnt = si.sadhmcnt; 870 sh.sadhcnt = si.sadhcnt; 871 872 NLA_PUT_U32(skb, XFRMA_SAD_CNT, si.sadcnt); 873 NLA_PUT(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh); 874 875 return nlmsg_end(skb, nlh); 876 877 nla_put_failure: 878 nlmsg_cancel(skb, nlh); 879 return -EMSGSIZE; 880 } 881 882 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 883 struct nlattr **attrs) 884 { 885 struct net *net = sock_net(skb->sk); 886 struct sk_buff *r_skb; 887 u32 *flags = nlmsg_data(nlh); 888 u32 spid = NETLINK_CB(skb).pid; 889 u32 seq = nlh->nlmsg_seq; 890 891 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC); 892 if (r_skb == NULL) 893 return -ENOMEM; 894 895 if (build_sadinfo(r_skb, net, spid, seq, *flags) < 0) 896 BUG(); 897 898 return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid); 899 } 900 901 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 902 struct nlattr **attrs) 903 { 904 struct net *net = sock_net(skb->sk); 905 struct xfrm_usersa_id *p = nlmsg_data(nlh); 906 struct xfrm_state *x; 907 struct sk_buff *resp_skb; 908 int err = -ESRCH; 909 910 x = xfrm_user_state_lookup(net, p, attrs, &err); 911 if (x == NULL) 912 goto out_noput; 913 914 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 915 if (IS_ERR(resp_skb)) { 916 err = PTR_ERR(resp_skb); 917 } else { 918 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid); 919 } 920 xfrm_state_put(x); 921 out_noput: 922 return err; 923 } 924 925 static int verify_userspi_info(struct xfrm_userspi_info *p) 926 { 927 switch (p->info.id.proto) { 928 case IPPROTO_AH: 929 case IPPROTO_ESP: 930 break; 931 932 case IPPROTO_COMP: 933 /* IPCOMP spi is 16-bits. */ 934 if (p->max >= 0x10000) 935 return -EINVAL; 936 break; 937 938 default: 939 return -EINVAL; 940 } 941 942 if (p->min > p->max) 943 return -EINVAL; 944 945 return 0; 946 } 947 948 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, 949 struct nlattr **attrs) 950 { 951 struct net *net = sock_net(skb->sk); 952 struct xfrm_state *x; 953 struct xfrm_userspi_info *p; 954 struct sk_buff *resp_skb; 955 xfrm_address_t *daddr; 956 int family; 957 int err; 958 u32 mark; 959 struct xfrm_mark m; 960 961 p = nlmsg_data(nlh); 962 err = verify_userspi_info(p); 963 if (err) 964 goto out_noput; 965 966 family = p->info.family; 967 daddr = &p->info.id.daddr; 968 969 x = NULL; 970 971 mark = xfrm_mark_get(attrs, &m); 972 if (p->info.seq) { 973 x = xfrm_find_acq_byseq(net, mark, p->info.seq); 974 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) { 975 xfrm_state_put(x); 976 x = NULL; 977 } 978 } 979 980 if (!x) 981 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid, 982 p->info.id.proto, daddr, 983 &p->info.saddr, 1, 984 family); 985 err = -ENOENT; 986 if (x == NULL) 987 goto out_noput; 988 989 err = xfrm_alloc_spi(x, p->min, p->max); 990 if (err) 991 goto out; 992 993 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); 994 if (IS_ERR(resp_skb)) { 995 err = PTR_ERR(resp_skb); 996 goto out; 997 } 998 999 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid); 1000 1001 out: 1002 xfrm_state_put(x); 1003 out_noput: 1004 return err; 1005 } 1006 1007 static int verify_policy_dir(u8 dir) 1008 { 1009 switch (dir) { 1010 case XFRM_POLICY_IN: 1011 case XFRM_POLICY_OUT: 1012 case XFRM_POLICY_FWD: 1013 break; 1014 1015 default: 1016 return -EINVAL; 1017 } 1018 1019 return 0; 1020 } 1021 1022 static int verify_policy_type(u8 type) 1023 { 1024 switch (type) { 1025 case XFRM_POLICY_TYPE_MAIN: 1026 #ifdef CONFIG_XFRM_SUB_POLICY 1027 case XFRM_POLICY_TYPE_SUB: 1028 #endif 1029 break; 1030 1031 default: 1032 return -EINVAL; 1033 } 1034 1035 return 0; 1036 } 1037 1038 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p) 1039 { 1040 switch (p->share) { 1041 case XFRM_SHARE_ANY: 1042 case XFRM_SHARE_SESSION: 1043 case XFRM_SHARE_USER: 1044 case XFRM_SHARE_UNIQUE: 1045 break; 1046 1047 default: 1048 return -EINVAL; 1049 } 1050 1051 switch (p->action) { 1052 case XFRM_POLICY_ALLOW: 1053 case XFRM_POLICY_BLOCK: 1054 break; 1055 1056 default: 1057 return -EINVAL; 1058 } 1059 1060 switch (p->sel.family) { 1061 case AF_INET: 1062 break; 1063 1064 case AF_INET6: 1065 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1066 break; 1067 #else 1068 return -EAFNOSUPPORT; 1069 #endif 1070 1071 default: 1072 return -EINVAL; 1073 } 1074 1075 return verify_policy_dir(p->dir); 1076 } 1077 1078 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs) 1079 { 1080 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1081 struct xfrm_user_sec_ctx *uctx; 1082 1083 if (!rt) 1084 return 0; 1085 1086 uctx = nla_data(rt); 1087 return security_xfrm_policy_alloc(&pol->security, uctx); 1088 } 1089 1090 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut, 1091 int nr) 1092 { 1093 int i; 1094 1095 xp->xfrm_nr = nr; 1096 for (i = 0; i < nr; i++, ut++) { 1097 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 1098 1099 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id)); 1100 memcpy(&t->saddr, &ut->saddr, 1101 sizeof(xfrm_address_t)); 1102 t->reqid = ut->reqid; 1103 t->mode = ut->mode; 1104 t->share = ut->share; 1105 t->optional = ut->optional; 1106 t->aalgos = ut->aalgos; 1107 t->ealgos = ut->ealgos; 1108 t->calgos = ut->calgos; 1109 /* If all masks are ~0, then we allow all algorithms. */ 1110 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos); 1111 t->encap_family = ut->family; 1112 } 1113 } 1114 1115 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family) 1116 { 1117 int i; 1118 1119 if (nr > XFRM_MAX_DEPTH) 1120 return -EINVAL; 1121 1122 for (i = 0; i < nr; i++) { 1123 /* We never validated the ut->family value, so many 1124 * applications simply leave it at zero. The check was 1125 * never made and ut->family was ignored because all 1126 * templates could be assumed to have the same family as 1127 * the policy itself. Now that we will have ipv4-in-ipv6 1128 * and ipv6-in-ipv4 tunnels, this is no longer true. 1129 */ 1130 if (!ut[i].family) 1131 ut[i].family = family; 1132 1133 switch (ut[i].family) { 1134 case AF_INET: 1135 break; 1136 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1137 case AF_INET6: 1138 break; 1139 #endif 1140 default: 1141 return -EINVAL; 1142 } 1143 } 1144 1145 return 0; 1146 } 1147 1148 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs) 1149 { 1150 struct nlattr *rt = attrs[XFRMA_TMPL]; 1151 1152 if (!rt) { 1153 pol->xfrm_nr = 0; 1154 } else { 1155 struct xfrm_user_tmpl *utmpl = nla_data(rt); 1156 int nr = nla_len(rt) / sizeof(*utmpl); 1157 int err; 1158 1159 err = validate_tmpl(nr, utmpl, pol->family); 1160 if (err) 1161 return err; 1162 1163 copy_templates(pol, utmpl, nr); 1164 } 1165 return 0; 1166 } 1167 1168 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs) 1169 { 1170 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE]; 1171 struct xfrm_userpolicy_type *upt; 1172 u8 type = XFRM_POLICY_TYPE_MAIN; 1173 int err; 1174 1175 if (rt) { 1176 upt = nla_data(rt); 1177 type = upt->type; 1178 } 1179 1180 err = verify_policy_type(type); 1181 if (err) 1182 return err; 1183 1184 *tp = type; 1185 return 0; 1186 } 1187 1188 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p) 1189 { 1190 xp->priority = p->priority; 1191 xp->index = p->index; 1192 memcpy(&xp->selector, &p->sel, sizeof(xp->selector)); 1193 memcpy(&xp->lft, &p->lft, sizeof(xp->lft)); 1194 xp->action = p->action; 1195 xp->flags = p->flags; 1196 xp->family = p->sel.family; 1197 /* XXX xp->share = p->share; */ 1198 } 1199 1200 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir) 1201 { 1202 memcpy(&p->sel, &xp->selector, sizeof(p->sel)); 1203 memcpy(&p->lft, &xp->lft, sizeof(p->lft)); 1204 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft)); 1205 p->priority = xp->priority; 1206 p->index = xp->index; 1207 p->sel.family = xp->family; 1208 p->dir = dir; 1209 p->action = xp->action; 1210 p->flags = xp->flags; 1211 p->share = XFRM_SHARE_ANY; /* XXX xp->share */ 1212 } 1213 1214 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp) 1215 { 1216 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL); 1217 int err; 1218 1219 if (!xp) { 1220 *errp = -ENOMEM; 1221 return NULL; 1222 } 1223 1224 copy_from_user_policy(xp, p); 1225 1226 err = copy_from_user_policy_type(&xp->type, attrs); 1227 if (err) 1228 goto error; 1229 1230 if (!(err = copy_from_user_tmpl(xp, attrs))) 1231 err = copy_from_user_sec_ctx(xp, attrs); 1232 if (err) 1233 goto error; 1234 1235 xfrm_mark_get(attrs, &xp->mark); 1236 1237 return xp; 1238 error: 1239 *errp = err; 1240 xp->walk.dead = 1; 1241 xfrm_policy_destroy(xp); 1242 return NULL; 1243 } 1244 1245 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1246 struct nlattr **attrs) 1247 { 1248 struct net *net = sock_net(skb->sk); 1249 struct xfrm_userpolicy_info *p = nlmsg_data(nlh); 1250 struct xfrm_policy *xp; 1251 struct km_event c; 1252 int err; 1253 int excl; 1254 uid_t loginuid = NETLINK_CB(skb).loginuid; 1255 u32 sessionid = NETLINK_CB(skb).sessionid; 1256 u32 sid = NETLINK_CB(skb).sid; 1257 1258 err = verify_newpolicy_info(p); 1259 if (err) 1260 return err; 1261 err = verify_sec_ctx_len(attrs); 1262 if (err) 1263 return err; 1264 1265 xp = xfrm_policy_construct(net, p, attrs, &err); 1266 if (!xp) 1267 return err; 1268 1269 /* shouldnt excl be based on nlh flags?? 1270 * Aha! this is anti-netlink really i.e more pfkey derived 1271 * in netlink excl is a flag and you wouldnt need 1272 * a type XFRM_MSG_UPDPOLICY - JHS */ 1273 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY; 1274 err = xfrm_policy_insert(p->dir, xp, excl); 1275 xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid); 1276 1277 if (err) { 1278 security_xfrm_policy_free(xp->security); 1279 kfree(xp); 1280 return err; 1281 } 1282 1283 c.event = nlh->nlmsg_type; 1284 c.seq = nlh->nlmsg_seq; 1285 c.pid = nlh->nlmsg_pid; 1286 km_policy_notify(xp, p->dir, &c); 1287 1288 xfrm_pol_put(xp); 1289 1290 return 0; 1291 } 1292 1293 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb) 1294 { 1295 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH]; 1296 int i; 1297 1298 if (xp->xfrm_nr == 0) 1299 return 0; 1300 1301 for (i = 0; i < xp->xfrm_nr; i++) { 1302 struct xfrm_user_tmpl *up = &vec[i]; 1303 struct xfrm_tmpl *kp = &xp->xfrm_vec[i]; 1304 1305 memcpy(&up->id, &kp->id, sizeof(up->id)); 1306 up->family = kp->encap_family; 1307 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr)); 1308 up->reqid = kp->reqid; 1309 up->mode = kp->mode; 1310 up->share = kp->share; 1311 up->optional = kp->optional; 1312 up->aalgos = kp->aalgos; 1313 up->ealgos = kp->ealgos; 1314 up->calgos = kp->calgos; 1315 } 1316 1317 return nla_put(skb, XFRMA_TMPL, 1318 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec); 1319 } 1320 1321 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb) 1322 { 1323 if (x->security) { 1324 return copy_sec_ctx(x->security, skb); 1325 } 1326 return 0; 1327 } 1328 1329 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb) 1330 { 1331 if (xp->security) { 1332 return copy_sec_ctx(xp->security, skb); 1333 } 1334 return 0; 1335 } 1336 static inline size_t userpolicy_type_attrsize(void) 1337 { 1338 #ifdef CONFIG_XFRM_SUB_POLICY 1339 return nla_total_size(sizeof(struct xfrm_userpolicy_type)); 1340 #else 1341 return 0; 1342 #endif 1343 } 1344 1345 #ifdef CONFIG_XFRM_SUB_POLICY 1346 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1347 { 1348 struct xfrm_userpolicy_type upt = { 1349 .type = type, 1350 }; 1351 1352 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt); 1353 } 1354 1355 #else 1356 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb) 1357 { 1358 return 0; 1359 } 1360 #endif 1361 1362 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr) 1363 { 1364 struct xfrm_dump_info *sp = ptr; 1365 struct xfrm_userpolicy_info *p; 1366 struct sk_buff *in_skb = sp->in_skb; 1367 struct sk_buff *skb = sp->out_skb; 1368 struct nlmsghdr *nlh; 1369 1370 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq, 1371 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags); 1372 if (nlh == NULL) 1373 return -EMSGSIZE; 1374 1375 p = nlmsg_data(nlh); 1376 copy_to_user_policy(xp, p, dir); 1377 if (copy_to_user_tmpl(xp, skb) < 0) 1378 goto nlmsg_failure; 1379 if (copy_to_user_sec_ctx(xp, skb)) 1380 goto nlmsg_failure; 1381 if (copy_to_user_policy_type(xp->type, skb) < 0) 1382 goto nlmsg_failure; 1383 if (xfrm_mark_put(skb, &xp->mark)) 1384 goto nla_put_failure; 1385 1386 nlmsg_end(skb, nlh); 1387 return 0; 1388 1389 nla_put_failure: 1390 nlmsg_failure: 1391 nlmsg_cancel(skb, nlh); 1392 return -EMSGSIZE; 1393 } 1394 1395 static int xfrm_dump_policy_done(struct netlink_callback *cb) 1396 { 1397 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1]; 1398 1399 xfrm_policy_walk_done(walk); 1400 return 0; 1401 } 1402 1403 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb) 1404 { 1405 struct net *net = sock_net(skb->sk); 1406 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1]; 1407 struct xfrm_dump_info info; 1408 1409 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) > 1410 sizeof(cb->args) - sizeof(cb->args[0])); 1411 1412 info.in_skb = cb->skb; 1413 info.out_skb = skb; 1414 info.nlmsg_seq = cb->nlh->nlmsg_seq; 1415 info.nlmsg_flags = NLM_F_MULTI; 1416 1417 if (!cb->args[0]) { 1418 cb->args[0] = 1; 1419 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY); 1420 } 1421 1422 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info); 1423 1424 return skb->len; 1425 } 1426 1427 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb, 1428 struct xfrm_policy *xp, 1429 int dir, u32 seq) 1430 { 1431 struct xfrm_dump_info info; 1432 struct sk_buff *skb; 1433 1434 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1435 if (!skb) 1436 return ERR_PTR(-ENOMEM); 1437 1438 info.in_skb = in_skb; 1439 info.out_skb = skb; 1440 info.nlmsg_seq = seq; 1441 info.nlmsg_flags = 0; 1442 1443 if (dump_one_policy(xp, dir, 0, &info) < 0) { 1444 kfree_skb(skb); 1445 return NULL; 1446 } 1447 1448 return skb; 1449 } 1450 1451 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1452 struct nlattr **attrs) 1453 { 1454 struct net *net = sock_net(skb->sk); 1455 struct xfrm_policy *xp; 1456 struct xfrm_userpolicy_id *p; 1457 u8 type = XFRM_POLICY_TYPE_MAIN; 1458 int err; 1459 struct km_event c; 1460 int delete; 1461 struct xfrm_mark m; 1462 u32 mark = xfrm_mark_get(attrs, &m); 1463 1464 p = nlmsg_data(nlh); 1465 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY; 1466 1467 err = copy_from_user_policy_type(&type, attrs); 1468 if (err) 1469 return err; 1470 1471 err = verify_policy_dir(p->dir); 1472 if (err) 1473 return err; 1474 1475 if (p->index) 1476 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err); 1477 else { 1478 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1479 struct xfrm_sec_ctx *ctx; 1480 1481 err = verify_sec_ctx_len(attrs); 1482 if (err) 1483 return err; 1484 1485 ctx = NULL; 1486 if (rt) { 1487 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 1488 1489 err = security_xfrm_policy_alloc(&ctx, uctx); 1490 if (err) 1491 return err; 1492 } 1493 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel, 1494 ctx, delete, &err); 1495 security_xfrm_policy_free(ctx); 1496 } 1497 if (xp == NULL) 1498 return -ENOENT; 1499 1500 if (!delete) { 1501 struct sk_buff *resp_skb; 1502 1503 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq); 1504 if (IS_ERR(resp_skb)) { 1505 err = PTR_ERR(resp_skb); 1506 } else { 1507 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, 1508 NETLINK_CB(skb).pid); 1509 } 1510 } else { 1511 uid_t loginuid = NETLINK_CB(skb).loginuid; 1512 u32 sessionid = NETLINK_CB(skb).sessionid; 1513 u32 sid = NETLINK_CB(skb).sid; 1514 1515 xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid, 1516 sid); 1517 1518 if (err != 0) 1519 goto out; 1520 1521 c.data.byid = p->index; 1522 c.event = nlh->nlmsg_type; 1523 c.seq = nlh->nlmsg_seq; 1524 c.pid = nlh->nlmsg_pid; 1525 km_policy_notify(xp, p->dir, &c); 1526 } 1527 1528 out: 1529 xfrm_pol_put(xp); 1530 return err; 1531 } 1532 1533 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 1534 struct nlattr **attrs) 1535 { 1536 struct net *net = sock_net(skb->sk); 1537 struct km_event c; 1538 struct xfrm_usersa_flush *p = nlmsg_data(nlh); 1539 struct xfrm_audit audit_info; 1540 int err; 1541 1542 audit_info.loginuid = NETLINK_CB(skb).loginuid; 1543 audit_info.sessionid = NETLINK_CB(skb).sessionid; 1544 audit_info.secid = NETLINK_CB(skb).sid; 1545 err = xfrm_state_flush(net, p->proto, &audit_info); 1546 if (err) { 1547 if (err == -ESRCH) /* empty table */ 1548 return 0; 1549 return err; 1550 } 1551 c.data.proto = p->proto; 1552 c.event = nlh->nlmsg_type; 1553 c.seq = nlh->nlmsg_seq; 1554 c.pid = nlh->nlmsg_pid; 1555 c.net = net; 1556 km_state_notify(NULL, &c); 1557 1558 return 0; 1559 } 1560 1561 static inline size_t xfrm_aevent_msgsize(void) 1562 { 1563 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id)) 1564 + nla_total_size(sizeof(struct xfrm_replay_state)) 1565 + nla_total_size(sizeof(struct xfrm_lifetime_cur)) 1566 + nla_total_size(sizeof(struct xfrm_mark)) 1567 + nla_total_size(4) /* XFRM_AE_RTHR */ 1568 + nla_total_size(4); /* XFRM_AE_ETHR */ 1569 } 1570 1571 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c) 1572 { 1573 struct xfrm_aevent_id *id; 1574 struct nlmsghdr *nlh; 1575 1576 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0); 1577 if (nlh == NULL) 1578 return -EMSGSIZE; 1579 1580 id = nlmsg_data(nlh); 1581 memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr)); 1582 id->sa_id.spi = x->id.spi; 1583 id->sa_id.family = x->props.family; 1584 id->sa_id.proto = x->id.proto; 1585 memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr)); 1586 id->reqid = x->props.reqid; 1587 id->flags = c->data.aevent; 1588 1589 NLA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay); 1590 NLA_PUT(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft); 1591 1592 if (id->flags & XFRM_AE_RTHR) 1593 NLA_PUT_U32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff); 1594 1595 if (id->flags & XFRM_AE_ETHR) 1596 NLA_PUT_U32(skb, XFRMA_ETIMER_THRESH, 1597 x->replay_maxage * 10 / HZ); 1598 1599 if (xfrm_mark_put(skb, &x->mark)) 1600 goto nla_put_failure; 1601 1602 return nlmsg_end(skb, nlh); 1603 1604 nla_put_failure: 1605 nlmsg_cancel(skb, nlh); 1606 return -EMSGSIZE; 1607 } 1608 1609 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 1610 struct nlattr **attrs) 1611 { 1612 struct net *net = sock_net(skb->sk); 1613 struct xfrm_state *x; 1614 struct sk_buff *r_skb; 1615 int err; 1616 struct km_event c; 1617 u32 mark; 1618 struct xfrm_mark m; 1619 struct xfrm_aevent_id *p = nlmsg_data(nlh); 1620 struct xfrm_usersa_id *id = &p->sa_id; 1621 1622 r_skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC); 1623 if (r_skb == NULL) 1624 return -ENOMEM; 1625 1626 mark = xfrm_mark_get(attrs, &m); 1627 1628 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family); 1629 if (x == NULL) { 1630 kfree_skb(r_skb); 1631 return -ESRCH; 1632 } 1633 1634 /* 1635 * XXX: is this lock really needed - none of the other 1636 * gets lock (the concern is things getting updated 1637 * while we are still reading) - jhs 1638 */ 1639 spin_lock_bh(&x->lock); 1640 c.data.aevent = p->flags; 1641 c.seq = nlh->nlmsg_seq; 1642 c.pid = nlh->nlmsg_pid; 1643 1644 if (build_aevent(r_skb, x, &c) < 0) 1645 BUG(); 1646 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).pid); 1647 spin_unlock_bh(&x->lock); 1648 xfrm_state_put(x); 1649 return err; 1650 } 1651 1652 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 1653 struct nlattr **attrs) 1654 { 1655 struct net *net = sock_net(skb->sk); 1656 struct xfrm_state *x; 1657 struct km_event c; 1658 int err = - EINVAL; 1659 u32 mark = 0; 1660 struct xfrm_mark m; 1661 struct xfrm_aevent_id *p = nlmsg_data(nlh); 1662 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; 1663 struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; 1664 1665 if (!lt && !rp) 1666 return err; 1667 1668 /* pedantic mode - thou shalt sayeth replaceth */ 1669 if (!(nlh->nlmsg_flags&NLM_F_REPLACE)) 1670 return err; 1671 1672 mark = xfrm_mark_get(attrs, &m); 1673 1674 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family); 1675 if (x == NULL) 1676 return -ESRCH; 1677 1678 if (x->km.state != XFRM_STATE_VALID) 1679 goto out; 1680 1681 spin_lock_bh(&x->lock); 1682 xfrm_update_ae_params(x, attrs); 1683 spin_unlock_bh(&x->lock); 1684 1685 c.event = nlh->nlmsg_type; 1686 c.seq = nlh->nlmsg_seq; 1687 c.pid = nlh->nlmsg_pid; 1688 c.data.aevent = XFRM_AE_CU; 1689 km_state_notify(x, &c); 1690 err = 0; 1691 out: 1692 xfrm_state_put(x); 1693 return err; 1694 } 1695 1696 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 1697 struct nlattr **attrs) 1698 { 1699 struct net *net = sock_net(skb->sk); 1700 struct km_event c; 1701 u8 type = XFRM_POLICY_TYPE_MAIN; 1702 int err; 1703 struct xfrm_audit audit_info; 1704 1705 err = copy_from_user_policy_type(&type, attrs); 1706 if (err) 1707 return err; 1708 1709 audit_info.loginuid = NETLINK_CB(skb).loginuid; 1710 audit_info.sessionid = NETLINK_CB(skb).sessionid; 1711 audit_info.secid = NETLINK_CB(skb).sid; 1712 err = xfrm_policy_flush(net, type, &audit_info); 1713 if (err) { 1714 if (err == -ESRCH) /* empty table */ 1715 return 0; 1716 return err; 1717 } 1718 1719 c.data.type = type; 1720 c.event = nlh->nlmsg_type; 1721 c.seq = nlh->nlmsg_seq; 1722 c.pid = nlh->nlmsg_pid; 1723 c.net = net; 1724 km_policy_notify(NULL, 0, &c); 1725 return 0; 1726 } 1727 1728 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 1729 struct nlattr **attrs) 1730 { 1731 struct net *net = sock_net(skb->sk); 1732 struct xfrm_policy *xp; 1733 struct xfrm_user_polexpire *up = nlmsg_data(nlh); 1734 struct xfrm_userpolicy_info *p = &up->pol; 1735 u8 type = XFRM_POLICY_TYPE_MAIN; 1736 int err = -ENOENT; 1737 struct xfrm_mark m; 1738 u32 mark = xfrm_mark_get(attrs, &m); 1739 1740 err = copy_from_user_policy_type(&type, attrs); 1741 if (err) 1742 return err; 1743 1744 err = verify_policy_dir(p->dir); 1745 if (err) 1746 return err; 1747 1748 if (p->index) 1749 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err); 1750 else { 1751 struct nlattr *rt = attrs[XFRMA_SEC_CTX]; 1752 struct xfrm_sec_ctx *ctx; 1753 1754 err = verify_sec_ctx_len(attrs); 1755 if (err) 1756 return err; 1757 1758 ctx = NULL; 1759 if (rt) { 1760 struct xfrm_user_sec_ctx *uctx = nla_data(rt); 1761 1762 err = security_xfrm_policy_alloc(&ctx, uctx); 1763 if (err) 1764 return err; 1765 } 1766 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, 1767 &p->sel, ctx, 0, &err); 1768 security_xfrm_policy_free(ctx); 1769 } 1770 if (xp == NULL) 1771 return -ENOENT; 1772 1773 if (unlikely(xp->walk.dead)) 1774 goto out; 1775 1776 err = 0; 1777 if (up->hard) { 1778 uid_t loginuid = NETLINK_CB(skb).loginuid; 1779 uid_t sessionid = NETLINK_CB(skb).sessionid; 1780 u32 sid = NETLINK_CB(skb).sid; 1781 xfrm_policy_delete(xp, p->dir); 1782 xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid); 1783 1784 } else { 1785 // reset the timers here? 1786 WARN(1, "Dont know what to do with soft policy expire\n"); 1787 } 1788 km_policy_expired(xp, p->dir, up->hard, current->pid); 1789 1790 out: 1791 xfrm_pol_put(xp); 1792 return err; 1793 } 1794 1795 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, 1796 struct nlattr **attrs) 1797 { 1798 struct net *net = sock_net(skb->sk); 1799 struct xfrm_state *x; 1800 int err; 1801 struct xfrm_user_expire *ue = nlmsg_data(nlh); 1802 struct xfrm_usersa_info *p = &ue->state; 1803 struct xfrm_mark m; 1804 u32 mark = xfrm_mark_get(attrs, &m); 1805 1806 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family); 1807 1808 err = -ENOENT; 1809 if (x == NULL) 1810 return err; 1811 1812 spin_lock_bh(&x->lock); 1813 err = -EINVAL; 1814 if (x->km.state != XFRM_STATE_VALID) 1815 goto out; 1816 km_state_expired(x, ue->hard, current->pid); 1817 1818 if (ue->hard) { 1819 uid_t loginuid = NETLINK_CB(skb).loginuid; 1820 uid_t sessionid = NETLINK_CB(skb).sessionid; 1821 u32 sid = NETLINK_CB(skb).sid; 1822 __xfrm_state_delete(x); 1823 xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid); 1824 } 1825 err = 0; 1826 out: 1827 spin_unlock_bh(&x->lock); 1828 xfrm_state_put(x); 1829 return err; 1830 } 1831 1832 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, 1833 struct nlattr **attrs) 1834 { 1835 struct net *net = sock_net(skb->sk); 1836 struct xfrm_policy *xp; 1837 struct xfrm_user_tmpl *ut; 1838 int i; 1839 struct nlattr *rt = attrs[XFRMA_TMPL]; 1840 struct xfrm_mark mark; 1841 1842 struct xfrm_user_acquire *ua = nlmsg_data(nlh); 1843 struct xfrm_state *x = xfrm_state_alloc(net); 1844 int err = -ENOMEM; 1845 1846 if (!x) 1847 goto nomem; 1848 1849 xfrm_mark_get(attrs, &mark); 1850 1851 err = verify_newpolicy_info(&ua->policy); 1852 if (err) 1853 goto bad_policy; 1854 1855 /* build an XP */ 1856 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err); 1857 if (!xp) 1858 goto free_state; 1859 1860 memcpy(&x->id, &ua->id, sizeof(ua->id)); 1861 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr)); 1862 memcpy(&x->sel, &ua->sel, sizeof(ua->sel)); 1863 xp->mark.m = x->mark.m = mark.m; 1864 xp->mark.v = x->mark.v = mark.v; 1865 ut = nla_data(rt); 1866 /* extract the templates and for each call km_key */ 1867 for (i = 0; i < xp->xfrm_nr; i++, ut++) { 1868 struct xfrm_tmpl *t = &xp->xfrm_vec[i]; 1869 memcpy(&x->id, &t->id, sizeof(x->id)); 1870 x->props.mode = t->mode; 1871 x->props.reqid = t->reqid; 1872 x->props.family = ut->family; 1873 t->aalgos = ua->aalgos; 1874 t->ealgos = ua->ealgos; 1875 t->calgos = ua->calgos; 1876 err = km_query(x, t, xp); 1877 1878 } 1879 1880 kfree(x); 1881 kfree(xp); 1882 1883 return 0; 1884 1885 bad_policy: 1886 WARN(1, "BAD policy passed\n"); 1887 free_state: 1888 kfree(x); 1889 nomem: 1890 return err; 1891 } 1892 1893 #ifdef CONFIG_XFRM_MIGRATE 1894 static int copy_from_user_migrate(struct xfrm_migrate *ma, 1895 struct xfrm_kmaddress *k, 1896 struct nlattr **attrs, int *num) 1897 { 1898 struct nlattr *rt = attrs[XFRMA_MIGRATE]; 1899 struct xfrm_user_migrate *um; 1900 int i, num_migrate; 1901 1902 if (k != NULL) { 1903 struct xfrm_user_kmaddress *uk; 1904 1905 uk = nla_data(attrs[XFRMA_KMADDRESS]); 1906 memcpy(&k->local, &uk->local, sizeof(k->local)); 1907 memcpy(&k->remote, &uk->remote, sizeof(k->remote)); 1908 k->family = uk->family; 1909 k->reserved = uk->reserved; 1910 } 1911 1912 um = nla_data(rt); 1913 num_migrate = nla_len(rt) / sizeof(*um); 1914 1915 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH) 1916 return -EINVAL; 1917 1918 for (i = 0; i < num_migrate; i++, um++, ma++) { 1919 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr)); 1920 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr)); 1921 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr)); 1922 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr)); 1923 1924 ma->proto = um->proto; 1925 ma->mode = um->mode; 1926 ma->reqid = um->reqid; 1927 1928 ma->old_family = um->old_family; 1929 ma->new_family = um->new_family; 1930 } 1931 1932 *num = i; 1933 return 0; 1934 } 1935 1936 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 1937 struct nlattr **attrs) 1938 { 1939 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh); 1940 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 1941 struct xfrm_kmaddress km, *kmp; 1942 u8 type; 1943 int err; 1944 int n = 0; 1945 1946 if (attrs[XFRMA_MIGRATE] == NULL) 1947 return -EINVAL; 1948 1949 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL; 1950 1951 err = copy_from_user_policy_type(&type, attrs); 1952 if (err) 1953 return err; 1954 1955 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n); 1956 if (err) 1957 return err; 1958 1959 if (!n) 1960 return 0; 1961 1962 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp); 1963 1964 return 0; 1965 } 1966 #else 1967 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, 1968 struct nlattr **attrs) 1969 { 1970 return -ENOPROTOOPT; 1971 } 1972 #endif 1973 1974 #ifdef CONFIG_XFRM_MIGRATE 1975 static int copy_to_user_migrate(struct xfrm_migrate *m, struct sk_buff *skb) 1976 { 1977 struct xfrm_user_migrate um; 1978 1979 memset(&um, 0, sizeof(um)); 1980 um.proto = m->proto; 1981 um.mode = m->mode; 1982 um.reqid = m->reqid; 1983 um.old_family = m->old_family; 1984 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr)); 1985 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr)); 1986 um.new_family = m->new_family; 1987 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr)); 1988 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr)); 1989 1990 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um); 1991 } 1992 1993 static int copy_to_user_kmaddress(struct xfrm_kmaddress *k, struct sk_buff *skb) 1994 { 1995 struct xfrm_user_kmaddress uk; 1996 1997 memset(&uk, 0, sizeof(uk)); 1998 uk.family = k->family; 1999 uk.reserved = k->reserved; 2000 memcpy(&uk.local, &k->local, sizeof(uk.local)); 2001 memcpy(&uk.remote, &k->remote, sizeof(uk.remote)); 2002 2003 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk); 2004 } 2005 2006 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma) 2007 { 2008 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id)) 2009 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0) 2010 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate) 2011 + userpolicy_type_attrsize(); 2012 } 2013 2014 static int build_migrate(struct sk_buff *skb, struct xfrm_migrate *m, 2015 int num_migrate, struct xfrm_kmaddress *k, 2016 struct xfrm_selector *sel, u8 dir, u8 type) 2017 { 2018 struct xfrm_migrate *mp; 2019 struct xfrm_userpolicy_id *pol_id; 2020 struct nlmsghdr *nlh; 2021 int i; 2022 2023 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0); 2024 if (nlh == NULL) 2025 return -EMSGSIZE; 2026 2027 pol_id = nlmsg_data(nlh); 2028 /* copy data from selector, dir, and type to the pol_id */ 2029 memset(pol_id, 0, sizeof(*pol_id)); 2030 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel)); 2031 pol_id->dir = dir; 2032 2033 if (k != NULL && (copy_to_user_kmaddress(k, skb) < 0)) 2034 goto nlmsg_failure; 2035 2036 if (copy_to_user_policy_type(type, skb) < 0) 2037 goto nlmsg_failure; 2038 2039 for (i = 0, mp = m ; i < num_migrate; i++, mp++) { 2040 if (copy_to_user_migrate(mp, skb) < 0) 2041 goto nlmsg_failure; 2042 } 2043 2044 return nlmsg_end(skb, nlh); 2045 nlmsg_failure: 2046 nlmsg_cancel(skb, nlh); 2047 return -EMSGSIZE; 2048 } 2049 2050 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type, 2051 struct xfrm_migrate *m, int num_migrate, 2052 struct xfrm_kmaddress *k) 2053 { 2054 struct net *net = &init_net; 2055 struct sk_buff *skb; 2056 2057 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC); 2058 if (skb == NULL) 2059 return -ENOMEM; 2060 2061 /* build migrate */ 2062 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0) 2063 BUG(); 2064 2065 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC); 2066 } 2067 #else 2068 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type, 2069 struct xfrm_migrate *m, int num_migrate, 2070 struct xfrm_kmaddress *k) 2071 { 2072 return -ENOPROTOOPT; 2073 } 2074 #endif 2075 2076 #define XMSGSIZE(type) sizeof(struct type) 2077 2078 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = { 2079 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2080 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2081 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), 2082 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2083 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2084 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2085 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info), 2086 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire), 2087 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire), 2088 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), 2089 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), 2090 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire), 2091 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush), 2092 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0, 2093 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2094 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), 2095 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report), 2096 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), 2097 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32), 2098 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32), 2099 }; 2100 2101 #undef XMSGSIZE 2102 2103 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = { 2104 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)}, 2105 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)}, 2106 [XFRMA_LASTUSED] = { .type = NLA_U64}, 2107 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)}, 2108 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) }, 2109 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) }, 2110 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) }, 2111 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) }, 2112 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) }, 2113 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) }, 2114 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) }, 2115 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) }, 2116 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) }, 2117 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 }, 2118 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 }, 2119 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) }, 2120 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) }, 2121 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)}, 2122 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) }, 2123 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) }, 2124 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) }, 2125 }; 2126 2127 static struct xfrm_link { 2128 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **); 2129 int (*dump)(struct sk_buff *, struct netlink_callback *); 2130 int (*done)(struct netlink_callback *); 2131 } xfrm_dispatch[XFRM_NR_MSGTYPES] = { 2132 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 2133 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa }, 2134 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa, 2135 .dump = xfrm_dump_sa, 2136 .done = xfrm_dump_sa_done }, 2137 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 2138 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy }, 2139 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy, 2140 .dump = xfrm_dump_policy, 2141 .done = xfrm_dump_policy_done }, 2142 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi }, 2143 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire }, 2144 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire }, 2145 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, 2146 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, 2147 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire}, 2148 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa }, 2149 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy }, 2150 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae }, 2151 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae }, 2152 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate }, 2153 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo }, 2154 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo }, 2155 }; 2156 2157 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 2158 { 2159 struct net *net = sock_net(skb->sk); 2160 struct nlattr *attrs[XFRMA_MAX+1]; 2161 struct xfrm_link *link; 2162 int type, err; 2163 2164 type = nlh->nlmsg_type; 2165 if (type > XFRM_MSG_MAX) 2166 return -EINVAL; 2167 2168 type -= XFRM_MSG_BASE; 2169 link = &xfrm_dispatch[type]; 2170 2171 /* All operations require privileges, even GET */ 2172 if (security_netlink_recv(skb, CAP_NET_ADMIN)) 2173 return -EPERM; 2174 2175 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) || 2176 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) && 2177 (nlh->nlmsg_flags & NLM_F_DUMP)) { 2178 if (link->dump == NULL) 2179 return -EINVAL; 2180 2181 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, link->dump, link->done); 2182 } 2183 2184 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX, 2185 xfrma_policy); 2186 if (err < 0) 2187 return err; 2188 2189 if (link->doit == NULL) 2190 return -EINVAL; 2191 2192 return link->doit(skb, nlh, attrs); 2193 } 2194 2195 static void xfrm_netlink_rcv(struct sk_buff *skb) 2196 { 2197 mutex_lock(&xfrm_cfg_mutex); 2198 netlink_rcv_skb(skb, &xfrm_user_rcv_msg); 2199 mutex_unlock(&xfrm_cfg_mutex); 2200 } 2201 2202 static inline size_t xfrm_expire_msgsize(void) 2203 { 2204 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire)) 2205 + nla_total_size(sizeof(struct xfrm_mark)); 2206 } 2207 2208 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c) 2209 { 2210 struct xfrm_user_expire *ue; 2211 struct nlmsghdr *nlh; 2212 2213 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0); 2214 if (nlh == NULL) 2215 return -EMSGSIZE; 2216 2217 ue = nlmsg_data(nlh); 2218 copy_to_user_state(x, &ue->state); 2219 ue->hard = (c->data.hard != 0) ? 1 : 0; 2220 2221 if (xfrm_mark_put(skb, &x->mark)) 2222 goto nla_put_failure; 2223 2224 return nlmsg_end(skb, nlh); 2225 2226 nla_put_failure: 2227 return -EMSGSIZE; 2228 } 2229 2230 static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c) 2231 { 2232 struct net *net = xs_net(x); 2233 struct sk_buff *skb; 2234 2235 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC); 2236 if (skb == NULL) 2237 return -ENOMEM; 2238 2239 if (build_expire(skb, x, c) < 0) { 2240 kfree_skb(skb); 2241 return -EMSGSIZE; 2242 } 2243 2244 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC); 2245 } 2246 2247 static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c) 2248 { 2249 struct net *net = xs_net(x); 2250 struct sk_buff *skb; 2251 2252 skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC); 2253 if (skb == NULL) 2254 return -ENOMEM; 2255 2256 if (build_aevent(skb, x, c) < 0) 2257 BUG(); 2258 2259 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC); 2260 } 2261 2262 static int xfrm_notify_sa_flush(struct km_event *c) 2263 { 2264 struct net *net = c->net; 2265 struct xfrm_usersa_flush *p; 2266 struct nlmsghdr *nlh; 2267 struct sk_buff *skb; 2268 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush)); 2269 2270 skb = nlmsg_new(len, GFP_ATOMIC); 2271 if (skb == NULL) 2272 return -ENOMEM; 2273 2274 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0); 2275 if (nlh == NULL) { 2276 kfree_skb(skb); 2277 return -EMSGSIZE; 2278 } 2279 2280 p = nlmsg_data(nlh); 2281 p->proto = c->data.proto; 2282 2283 nlmsg_end(skb, nlh); 2284 2285 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC); 2286 } 2287 2288 static inline size_t xfrm_sa_len(struct xfrm_state *x) 2289 { 2290 size_t l = 0; 2291 if (x->aead) 2292 l += nla_total_size(aead_len(x->aead)); 2293 if (x->aalg) { 2294 l += nla_total_size(sizeof(struct xfrm_algo) + 2295 (x->aalg->alg_key_len + 7) / 8); 2296 l += nla_total_size(xfrm_alg_auth_len(x->aalg)); 2297 } 2298 if (x->ealg) 2299 l += nla_total_size(xfrm_alg_len(x->ealg)); 2300 if (x->calg) 2301 l += nla_total_size(sizeof(*x->calg)); 2302 if (x->encap) 2303 l += nla_total_size(sizeof(*x->encap)); 2304 if (x->security) 2305 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) + 2306 x->security->ctx_len); 2307 if (x->coaddr) 2308 l += nla_total_size(sizeof(*x->coaddr)); 2309 2310 /* Must count x->lastused as it may become non-zero behind our back. */ 2311 l += nla_total_size(sizeof(u64)); 2312 2313 return l; 2314 } 2315 2316 static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c) 2317 { 2318 struct net *net = xs_net(x); 2319 struct xfrm_usersa_info *p; 2320 struct xfrm_usersa_id *id; 2321 struct nlmsghdr *nlh; 2322 struct sk_buff *skb; 2323 int len = xfrm_sa_len(x); 2324 int headlen; 2325 2326 headlen = sizeof(*p); 2327 if (c->event == XFRM_MSG_DELSA) { 2328 len += nla_total_size(headlen); 2329 headlen = sizeof(*id); 2330 len += nla_total_size(sizeof(struct xfrm_mark)); 2331 } 2332 len += NLMSG_ALIGN(headlen); 2333 2334 skb = nlmsg_new(len, GFP_ATOMIC); 2335 if (skb == NULL) 2336 return -ENOMEM; 2337 2338 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0); 2339 if (nlh == NULL) 2340 goto nla_put_failure; 2341 2342 p = nlmsg_data(nlh); 2343 if (c->event == XFRM_MSG_DELSA) { 2344 struct nlattr *attr; 2345 2346 id = nlmsg_data(nlh); 2347 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr)); 2348 id->spi = x->id.spi; 2349 id->family = x->props.family; 2350 id->proto = x->id.proto; 2351 2352 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p)); 2353 if (attr == NULL) 2354 goto nla_put_failure; 2355 2356 p = nla_data(attr); 2357 } 2358 2359 if (copy_to_user_state_extra(x, p, skb)) 2360 goto nla_put_failure; 2361 2362 nlmsg_end(skb, nlh); 2363 2364 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC); 2365 2366 nla_put_failure: 2367 /* Somebody screwed up with xfrm_sa_len! */ 2368 WARN_ON(1); 2369 kfree_skb(skb); 2370 return -1; 2371 } 2372 2373 static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c) 2374 { 2375 2376 switch (c->event) { 2377 case XFRM_MSG_EXPIRE: 2378 return xfrm_exp_state_notify(x, c); 2379 case XFRM_MSG_NEWAE: 2380 return xfrm_aevent_state_notify(x, c); 2381 case XFRM_MSG_DELSA: 2382 case XFRM_MSG_UPDSA: 2383 case XFRM_MSG_NEWSA: 2384 return xfrm_notify_sa(x, c); 2385 case XFRM_MSG_FLUSHSA: 2386 return xfrm_notify_sa_flush(c); 2387 default: 2388 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n", 2389 c->event); 2390 break; 2391 } 2392 2393 return 0; 2394 2395 } 2396 2397 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x, 2398 struct xfrm_policy *xp) 2399 { 2400 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire)) 2401 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 2402 + nla_total_size(sizeof(struct xfrm_mark)) 2403 + nla_total_size(xfrm_user_sec_ctx_size(x->security)) 2404 + userpolicy_type_attrsize(); 2405 } 2406 2407 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x, 2408 struct xfrm_tmpl *xt, struct xfrm_policy *xp, 2409 int dir) 2410 { 2411 struct xfrm_user_acquire *ua; 2412 struct nlmsghdr *nlh; 2413 __u32 seq = xfrm_get_acqseq(); 2414 2415 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0); 2416 if (nlh == NULL) 2417 return -EMSGSIZE; 2418 2419 ua = nlmsg_data(nlh); 2420 memcpy(&ua->id, &x->id, sizeof(ua->id)); 2421 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr)); 2422 memcpy(&ua->sel, &x->sel, sizeof(ua->sel)); 2423 copy_to_user_policy(xp, &ua->policy, dir); 2424 ua->aalgos = xt->aalgos; 2425 ua->ealgos = xt->ealgos; 2426 ua->calgos = xt->calgos; 2427 ua->seq = x->km.seq = seq; 2428 2429 if (copy_to_user_tmpl(xp, skb) < 0) 2430 goto nlmsg_failure; 2431 if (copy_to_user_state_sec_ctx(x, skb)) 2432 goto nlmsg_failure; 2433 if (copy_to_user_policy_type(xp->type, skb) < 0) 2434 goto nlmsg_failure; 2435 if (xfrm_mark_put(skb, &xp->mark)) 2436 goto nla_put_failure; 2437 2438 return nlmsg_end(skb, nlh); 2439 2440 nla_put_failure: 2441 nlmsg_failure: 2442 nlmsg_cancel(skb, nlh); 2443 return -EMSGSIZE; 2444 } 2445 2446 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt, 2447 struct xfrm_policy *xp, int dir) 2448 { 2449 struct net *net = xs_net(x); 2450 struct sk_buff *skb; 2451 2452 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC); 2453 if (skb == NULL) 2454 return -ENOMEM; 2455 2456 if (build_acquire(skb, x, xt, xp, dir) < 0) 2457 BUG(); 2458 2459 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC); 2460 } 2461 2462 /* User gives us xfrm_user_policy_info followed by an array of 0 2463 * or more templates. 2464 */ 2465 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt, 2466 u8 *data, int len, int *dir) 2467 { 2468 struct net *net = sock_net(sk); 2469 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data; 2470 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1); 2471 struct xfrm_policy *xp; 2472 int nr; 2473 2474 switch (sk->sk_family) { 2475 case AF_INET: 2476 if (opt != IP_XFRM_POLICY) { 2477 *dir = -EOPNOTSUPP; 2478 return NULL; 2479 } 2480 break; 2481 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 2482 case AF_INET6: 2483 if (opt != IPV6_XFRM_POLICY) { 2484 *dir = -EOPNOTSUPP; 2485 return NULL; 2486 } 2487 break; 2488 #endif 2489 default: 2490 *dir = -EINVAL; 2491 return NULL; 2492 } 2493 2494 *dir = -EINVAL; 2495 2496 if (len < sizeof(*p) || 2497 verify_newpolicy_info(p)) 2498 return NULL; 2499 2500 nr = ((len - sizeof(*p)) / sizeof(*ut)); 2501 if (validate_tmpl(nr, ut, p->sel.family)) 2502 return NULL; 2503 2504 if (p->dir > XFRM_POLICY_OUT) 2505 return NULL; 2506 2507 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 2508 if (xp == NULL) { 2509 *dir = -ENOBUFS; 2510 return NULL; 2511 } 2512 2513 copy_from_user_policy(xp, p); 2514 xp->type = XFRM_POLICY_TYPE_MAIN; 2515 copy_templates(xp, ut, nr); 2516 2517 *dir = p->dir; 2518 2519 return xp; 2520 } 2521 2522 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp) 2523 { 2524 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire)) 2525 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) 2526 + nla_total_size(xfrm_user_sec_ctx_size(xp->security)) 2527 + nla_total_size(sizeof(struct xfrm_mark)) 2528 + userpolicy_type_attrsize(); 2529 } 2530 2531 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp, 2532 int dir, struct km_event *c) 2533 { 2534 struct xfrm_user_polexpire *upe; 2535 struct nlmsghdr *nlh; 2536 int hard = c->data.hard; 2537 2538 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0); 2539 if (nlh == NULL) 2540 return -EMSGSIZE; 2541 2542 upe = nlmsg_data(nlh); 2543 copy_to_user_policy(xp, &upe->pol, dir); 2544 if (copy_to_user_tmpl(xp, skb) < 0) 2545 goto nlmsg_failure; 2546 if (copy_to_user_sec_ctx(xp, skb)) 2547 goto nlmsg_failure; 2548 if (copy_to_user_policy_type(xp->type, skb) < 0) 2549 goto nlmsg_failure; 2550 if (xfrm_mark_put(skb, &xp->mark)) 2551 goto nla_put_failure; 2552 upe->hard = !!hard; 2553 2554 return nlmsg_end(skb, nlh); 2555 2556 nla_put_failure: 2557 nlmsg_failure: 2558 nlmsg_cancel(skb, nlh); 2559 return -EMSGSIZE; 2560 } 2561 2562 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) 2563 { 2564 struct net *net = xp_net(xp); 2565 struct sk_buff *skb; 2566 2567 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC); 2568 if (skb == NULL) 2569 return -ENOMEM; 2570 2571 if (build_polexpire(skb, xp, dir, c) < 0) 2572 BUG(); 2573 2574 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC); 2575 } 2576 2577 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c) 2578 { 2579 struct net *net = xp_net(xp); 2580 struct xfrm_userpolicy_info *p; 2581 struct xfrm_userpolicy_id *id; 2582 struct nlmsghdr *nlh; 2583 struct sk_buff *skb; 2584 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); 2585 int headlen; 2586 2587 headlen = sizeof(*p); 2588 if (c->event == XFRM_MSG_DELPOLICY) { 2589 len += nla_total_size(headlen); 2590 headlen = sizeof(*id); 2591 } 2592 len += userpolicy_type_attrsize(); 2593 len += nla_total_size(sizeof(struct xfrm_mark)); 2594 len += NLMSG_ALIGN(headlen); 2595 2596 skb = nlmsg_new(len, GFP_ATOMIC); 2597 if (skb == NULL) 2598 return -ENOMEM; 2599 2600 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0); 2601 if (nlh == NULL) 2602 goto nlmsg_failure; 2603 2604 p = nlmsg_data(nlh); 2605 if (c->event == XFRM_MSG_DELPOLICY) { 2606 struct nlattr *attr; 2607 2608 id = nlmsg_data(nlh); 2609 memset(id, 0, sizeof(*id)); 2610 id->dir = dir; 2611 if (c->data.byid) 2612 id->index = xp->index; 2613 else 2614 memcpy(&id->sel, &xp->selector, sizeof(id->sel)); 2615 2616 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p)); 2617 if (attr == NULL) 2618 goto nlmsg_failure; 2619 2620 p = nla_data(attr); 2621 } 2622 2623 copy_to_user_policy(xp, p, dir); 2624 if (copy_to_user_tmpl(xp, skb) < 0) 2625 goto nlmsg_failure; 2626 if (copy_to_user_policy_type(xp->type, skb) < 0) 2627 goto nlmsg_failure; 2628 2629 if (xfrm_mark_put(skb, &xp->mark)) 2630 goto nla_put_failure; 2631 2632 nlmsg_end(skb, nlh); 2633 2634 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC); 2635 2636 nla_put_failure: 2637 nlmsg_failure: 2638 kfree_skb(skb); 2639 return -1; 2640 } 2641 2642 static int xfrm_notify_policy_flush(struct km_event *c) 2643 { 2644 struct net *net = c->net; 2645 struct nlmsghdr *nlh; 2646 struct sk_buff *skb; 2647 2648 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC); 2649 if (skb == NULL) 2650 return -ENOMEM; 2651 2652 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0); 2653 if (nlh == NULL) 2654 goto nlmsg_failure; 2655 if (copy_to_user_policy_type(c->data.type, skb) < 0) 2656 goto nlmsg_failure; 2657 2658 nlmsg_end(skb, nlh); 2659 2660 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC); 2661 2662 nlmsg_failure: 2663 kfree_skb(skb); 2664 return -1; 2665 } 2666 2667 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) 2668 { 2669 2670 switch (c->event) { 2671 case XFRM_MSG_NEWPOLICY: 2672 case XFRM_MSG_UPDPOLICY: 2673 case XFRM_MSG_DELPOLICY: 2674 return xfrm_notify_policy(xp, dir, c); 2675 case XFRM_MSG_FLUSHPOLICY: 2676 return xfrm_notify_policy_flush(c); 2677 case XFRM_MSG_POLEXPIRE: 2678 return xfrm_exp_policy_notify(xp, dir, c); 2679 default: 2680 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n", 2681 c->event); 2682 } 2683 2684 return 0; 2685 2686 } 2687 2688 static inline size_t xfrm_report_msgsize(void) 2689 { 2690 return NLMSG_ALIGN(sizeof(struct xfrm_user_report)); 2691 } 2692 2693 static int build_report(struct sk_buff *skb, u8 proto, 2694 struct xfrm_selector *sel, xfrm_address_t *addr) 2695 { 2696 struct xfrm_user_report *ur; 2697 struct nlmsghdr *nlh; 2698 2699 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0); 2700 if (nlh == NULL) 2701 return -EMSGSIZE; 2702 2703 ur = nlmsg_data(nlh); 2704 ur->proto = proto; 2705 memcpy(&ur->sel, sel, sizeof(ur->sel)); 2706 2707 if (addr) 2708 NLA_PUT(skb, XFRMA_COADDR, sizeof(*addr), addr); 2709 2710 return nlmsg_end(skb, nlh); 2711 2712 nla_put_failure: 2713 nlmsg_cancel(skb, nlh); 2714 return -EMSGSIZE; 2715 } 2716 2717 static int xfrm_send_report(struct net *net, u8 proto, 2718 struct xfrm_selector *sel, xfrm_address_t *addr) 2719 { 2720 struct sk_buff *skb; 2721 2722 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC); 2723 if (skb == NULL) 2724 return -ENOMEM; 2725 2726 if (build_report(skb, proto, sel, addr) < 0) 2727 BUG(); 2728 2729 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC); 2730 } 2731 2732 static inline size_t xfrm_mapping_msgsize(void) 2733 { 2734 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping)); 2735 } 2736 2737 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x, 2738 xfrm_address_t *new_saddr, __be16 new_sport) 2739 { 2740 struct xfrm_user_mapping *um; 2741 struct nlmsghdr *nlh; 2742 2743 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0); 2744 if (nlh == NULL) 2745 return -EMSGSIZE; 2746 2747 um = nlmsg_data(nlh); 2748 2749 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr)); 2750 um->id.spi = x->id.spi; 2751 um->id.family = x->props.family; 2752 um->id.proto = x->id.proto; 2753 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr)); 2754 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr)); 2755 um->new_sport = new_sport; 2756 um->old_sport = x->encap->encap_sport; 2757 um->reqid = x->props.reqid; 2758 2759 return nlmsg_end(skb, nlh); 2760 } 2761 2762 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, 2763 __be16 sport) 2764 { 2765 struct net *net = xs_net(x); 2766 struct sk_buff *skb; 2767 2768 if (x->id.proto != IPPROTO_ESP) 2769 return -EINVAL; 2770 2771 if (!x->encap) 2772 return -EINVAL; 2773 2774 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC); 2775 if (skb == NULL) 2776 return -ENOMEM; 2777 2778 if (build_mapping(skb, x, ipaddr, sport) < 0) 2779 BUG(); 2780 2781 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MAPPING, GFP_ATOMIC); 2782 } 2783 2784 static struct xfrm_mgr netlink_mgr = { 2785 .id = "netlink", 2786 .notify = xfrm_send_state_notify, 2787 .acquire = xfrm_send_acquire, 2788 .compile_policy = xfrm_compile_policy, 2789 .notify_policy = xfrm_send_policy_notify, 2790 .report = xfrm_send_report, 2791 .migrate = xfrm_send_migrate, 2792 .new_mapping = xfrm_send_mapping, 2793 }; 2794 2795 static int __net_init xfrm_user_net_init(struct net *net) 2796 { 2797 struct sock *nlsk; 2798 2799 nlsk = netlink_kernel_create(net, NETLINK_XFRM, XFRMNLGRP_MAX, 2800 xfrm_netlink_rcv, NULL, THIS_MODULE); 2801 if (nlsk == NULL) 2802 return -ENOMEM; 2803 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */ 2804 rcu_assign_pointer(net->xfrm.nlsk, nlsk); 2805 return 0; 2806 } 2807 2808 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list) 2809 { 2810 struct net *net; 2811 list_for_each_entry(net, net_exit_list, exit_list) 2812 rcu_assign_pointer(net->xfrm.nlsk, NULL); 2813 synchronize_net(); 2814 list_for_each_entry(net, net_exit_list, exit_list) 2815 netlink_kernel_release(net->xfrm.nlsk_stash); 2816 } 2817 2818 static struct pernet_operations xfrm_user_net_ops = { 2819 .init = xfrm_user_net_init, 2820 .exit_batch = xfrm_user_net_exit, 2821 }; 2822 2823 static int __init xfrm_user_init(void) 2824 { 2825 int rv; 2826 2827 printk(KERN_INFO "Initializing XFRM netlink socket\n"); 2828 2829 rv = register_pernet_subsys(&xfrm_user_net_ops); 2830 if (rv < 0) 2831 return rv; 2832 rv = xfrm_register_km(&netlink_mgr); 2833 if (rv < 0) 2834 unregister_pernet_subsys(&xfrm_user_net_ops); 2835 return rv; 2836 } 2837 2838 static void __exit xfrm_user_exit(void) 2839 { 2840 xfrm_unregister_km(&netlink_mgr); 2841 unregister_pernet_subsys(&xfrm_user_net_ops); 2842 } 2843 2844 module_init(xfrm_user_init); 2845 module_exit(xfrm_user_exit); 2846 MODULE_LICENSE("GPL"); 2847 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM); 2848 2849