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