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