1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net> 4 * Copyright (c) 2014 Intel Corporation 5 * Author: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com> 6 * 7 * Development of this code funded by Astaro AG (http://www.astaro.com/) 8 */ 9 10 #include <linux/kernel.h> 11 #include <linux/netlink.h> 12 #include <linux/netfilter.h> 13 #include <linux/netfilter/nf_tables.h> 14 #include <linux/in.h> 15 #include <linux/ip.h> 16 #include <linux/ipv6.h> 17 #include <linux/smp.h> 18 #include <linux/static_key.h> 19 #include <net/dst.h> 20 #include <net/ip.h> 21 #include <net/sock.h> 22 #include <net/tcp_states.h> /* for TCP_TIME_WAIT */ 23 #include <net/netfilter/nf_tables.h> 24 #include <net/netfilter/nf_tables_core.h> 25 #include <net/netfilter/nft_meta.h> 26 #include <net/netfilter/nf_tables_offload.h> 27 28 #include <uapi/linux/netfilter_bridge.h> /* NF_BR_PRE_ROUTING */ 29 30 #define NFT_META_SECS_PER_MINUTE 60 31 #define NFT_META_SECS_PER_HOUR 3600 32 #define NFT_META_SECS_PER_DAY 86400 33 #define NFT_META_DAYS_PER_WEEK 7 34 35 static DEFINE_PER_CPU(struct rnd_state, nft_prandom_state); 36 37 static u8 nft_meta_weekday(void) 38 { 39 time64_t secs = ktime_get_real_seconds(); 40 unsigned int dse; 41 u8 wday; 42 43 secs -= NFT_META_SECS_PER_MINUTE * sys_tz.tz_minuteswest; 44 dse = div_u64(secs, NFT_META_SECS_PER_DAY); 45 wday = (4 + dse) % NFT_META_DAYS_PER_WEEK; 46 47 return wday; 48 } 49 50 static u32 nft_meta_hour(time64_t secs) 51 { 52 struct tm tm; 53 54 time64_to_tm(secs, 0, &tm); 55 56 return tm.tm_hour * NFT_META_SECS_PER_HOUR 57 + tm.tm_min * NFT_META_SECS_PER_MINUTE 58 + tm.tm_sec; 59 } 60 61 static noinline_for_stack void 62 nft_meta_get_eval_time(enum nft_meta_keys key, 63 u32 *dest) 64 { 65 switch (key) { 66 case NFT_META_TIME_NS: 67 nft_reg_store64(dest, ktime_get_real_ns()); 68 break; 69 case NFT_META_TIME_DAY: 70 nft_reg_store8(dest, nft_meta_weekday()); 71 break; 72 case NFT_META_TIME_HOUR: 73 *dest = nft_meta_hour(ktime_get_real_seconds()); 74 break; 75 default: 76 break; 77 } 78 } 79 80 static noinline bool 81 nft_meta_get_eval_pkttype_lo(const struct nft_pktinfo *pkt, 82 u32 *dest) 83 { 84 const struct sk_buff *skb = pkt->skb; 85 86 switch (nft_pf(pkt)) { 87 case NFPROTO_IPV4: 88 if (ipv4_is_multicast(ip_hdr(skb)->daddr)) 89 nft_reg_store8(dest, PACKET_MULTICAST); 90 else 91 nft_reg_store8(dest, PACKET_BROADCAST); 92 break; 93 case NFPROTO_IPV6: 94 nft_reg_store8(dest, PACKET_MULTICAST); 95 break; 96 case NFPROTO_NETDEV: 97 switch (skb->protocol) { 98 case htons(ETH_P_IP): { 99 int noff = skb_network_offset(skb); 100 struct iphdr *iph, _iph; 101 102 iph = skb_header_pointer(skb, noff, 103 sizeof(_iph), &_iph); 104 if (!iph) 105 return false; 106 107 if (ipv4_is_multicast(iph->daddr)) 108 nft_reg_store8(dest, PACKET_MULTICAST); 109 else 110 nft_reg_store8(dest, PACKET_BROADCAST); 111 112 break; 113 } 114 case htons(ETH_P_IPV6): 115 nft_reg_store8(dest, PACKET_MULTICAST); 116 break; 117 default: 118 WARN_ON_ONCE(1); 119 return false; 120 } 121 break; 122 default: 123 WARN_ON_ONCE(1); 124 return false; 125 } 126 127 return true; 128 } 129 130 static noinline bool 131 nft_meta_get_eval_skugid(enum nft_meta_keys key, 132 u32 *dest, 133 const struct nft_pktinfo *pkt) 134 { 135 struct sock *sk = skb_to_full_sk(pkt->skb); 136 struct socket *sock; 137 138 if (!sk || !sk_fullsock(sk) || !net_eq(nft_net(pkt), sock_net(sk))) 139 return false; 140 141 read_lock_bh(&sk->sk_callback_lock); 142 sock = sk->sk_socket; 143 if (!sock || !sock->file) { 144 read_unlock_bh(&sk->sk_callback_lock); 145 return false; 146 } 147 148 switch (key) { 149 case NFT_META_SKUID: 150 *dest = from_kuid_munged(sock_net(sk)->user_ns, 151 sock->file->f_cred->fsuid); 152 break; 153 case NFT_META_SKGID: 154 *dest = from_kgid_munged(sock_net(sk)->user_ns, 155 sock->file->f_cred->fsgid); 156 break; 157 default: 158 break; 159 } 160 161 read_unlock_bh(&sk->sk_callback_lock); 162 return true; 163 } 164 165 #ifdef CONFIG_CGROUP_NET_CLASSID 166 static noinline bool 167 nft_meta_get_eval_cgroup(u32 *dest, const struct nft_pktinfo *pkt) 168 { 169 struct sock *sk = skb_to_full_sk(pkt->skb); 170 171 if (!sk || !sk_fullsock(sk) || !net_eq(nft_net(pkt), sock_net(sk))) 172 return false; 173 174 *dest = sock_cgroup_classid(&sk->sk_cgrp_data); 175 return true; 176 } 177 #endif 178 179 static noinline bool nft_meta_get_eval_kind(enum nft_meta_keys key, 180 u32 *dest, 181 const struct nft_pktinfo *pkt) 182 { 183 const struct net_device *in = nft_in(pkt), *out = nft_out(pkt); 184 185 switch (key) { 186 case NFT_META_IIFKIND: 187 if (!in || !in->rtnl_link_ops) 188 return false; 189 strncpy((char *)dest, in->rtnl_link_ops->kind, IFNAMSIZ); 190 break; 191 case NFT_META_OIFKIND: 192 if (!out || !out->rtnl_link_ops) 193 return false; 194 strncpy((char *)dest, out->rtnl_link_ops->kind, IFNAMSIZ); 195 break; 196 default: 197 return false; 198 } 199 200 return true; 201 } 202 203 static void nft_meta_store_ifindex(u32 *dest, const struct net_device *dev) 204 { 205 *dest = dev ? dev->ifindex : 0; 206 } 207 208 static void nft_meta_store_ifname(u32 *dest, const struct net_device *dev) 209 { 210 strncpy((char *)dest, dev ? dev->name : "", IFNAMSIZ); 211 } 212 213 static bool nft_meta_store_iftype(u32 *dest, const struct net_device *dev) 214 { 215 if (!dev) 216 return false; 217 218 nft_reg_store16(dest, dev->type); 219 return true; 220 } 221 222 static bool nft_meta_store_ifgroup(u32 *dest, const struct net_device *dev) 223 { 224 if (!dev) 225 return false; 226 227 *dest = dev->group; 228 return true; 229 } 230 231 static bool nft_meta_get_eval_ifname(enum nft_meta_keys key, u32 *dest, 232 const struct nft_pktinfo *pkt) 233 { 234 switch (key) { 235 case NFT_META_IIFNAME: 236 nft_meta_store_ifname(dest, nft_in(pkt)); 237 break; 238 case NFT_META_OIFNAME: 239 nft_meta_store_ifname(dest, nft_out(pkt)); 240 break; 241 case NFT_META_IIF: 242 nft_meta_store_ifindex(dest, nft_in(pkt)); 243 break; 244 case NFT_META_OIF: 245 nft_meta_store_ifindex(dest, nft_out(pkt)); 246 break; 247 case NFT_META_IIFTYPE: 248 if (!nft_meta_store_iftype(dest, nft_in(pkt))) 249 return false; 250 break; 251 case NFT_META_OIFTYPE: 252 if (!nft_meta_store_iftype(dest, nft_out(pkt))) 253 return false; 254 break; 255 case NFT_META_IIFGROUP: 256 if (!nft_meta_store_ifgroup(dest, nft_in(pkt))) 257 return false; 258 break; 259 case NFT_META_OIFGROUP: 260 if (!nft_meta_store_ifgroup(dest, nft_out(pkt))) 261 return false; 262 break; 263 default: 264 return false; 265 } 266 267 return true; 268 } 269 270 static noinline u32 nft_prandom_u32(void) 271 { 272 struct rnd_state *state = this_cpu_ptr(&nft_prandom_state); 273 274 return prandom_u32_state(state); 275 } 276 277 #ifdef CONFIG_IP_ROUTE_CLASSID 278 static noinline bool 279 nft_meta_get_eval_rtclassid(const struct sk_buff *skb, u32 *dest) 280 { 281 const struct dst_entry *dst = skb_dst(skb); 282 283 if (!dst) 284 return false; 285 286 *dest = dst->tclassid; 287 return true; 288 } 289 #endif 290 291 static noinline u32 nft_meta_get_eval_sdif(const struct nft_pktinfo *pkt) 292 { 293 switch (nft_pf(pkt)) { 294 case NFPROTO_IPV4: 295 return inet_sdif(pkt->skb); 296 case NFPROTO_IPV6: 297 return inet6_sdif(pkt->skb); 298 } 299 300 return 0; 301 } 302 303 static noinline void 304 nft_meta_get_eval_sdifname(u32 *dest, const struct nft_pktinfo *pkt) 305 { 306 u32 sdif = nft_meta_get_eval_sdif(pkt); 307 const struct net_device *dev; 308 309 dev = sdif ? dev_get_by_index_rcu(nft_net(pkt), sdif) : NULL; 310 nft_meta_store_ifname(dest, dev); 311 } 312 313 void nft_meta_get_eval(const struct nft_expr *expr, 314 struct nft_regs *regs, 315 const struct nft_pktinfo *pkt) 316 { 317 const struct nft_meta *priv = nft_expr_priv(expr); 318 const struct sk_buff *skb = pkt->skb; 319 u32 *dest = ®s->data[priv->dreg]; 320 321 switch (priv->key) { 322 case NFT_META_LEN: 323 *dest = skb->len; 324 break; 325 case NFT_META_PROTOCOL: 326 nft_reg_store16(dest, (__force u16)skb->protocol); 327 break; 328 case NFT_META_NFPROTO: 329 nft_reg_store8(dest, nft_pf(pkt)); 330 break; 331 case NFT_META_L4PROTO: 332 if (!pkt->tprot_set) 333 goto err; 334 nft_reg_store8(dest, pkt->tprot); 335 break; 336 case NFT_META_PRIORITY: 337 *dest = skb->priority; 338 break; 339 case NFT_META_MARK: 340 *dest = skb->mark; 341 break; 342 case NFT_META_IIF: 343 case NFT_META_OIF: 344 case NFT_META_IIFNAME: 345 case NFT_META_OIFNAME: 346 case NFT_META_IIFTYPE: 347 case NFT_META_OIFTYPE: 348 case NFT_META_IIFGROUP: 349 case NFT_META_OIFGROUP: 350 if (!nft_meta_get_eval_ifname(priv->key, dest, pkt)) 351 goto err; 352 break; 353 case NFT_META_SKUID: 354 case NFT_META_SKGID: 355 if (!nft_meta_get_eval_skugid(priv->key, dest, pkt)) 356 goto err; 357 break; 358 #ifdef CONFIG_IP_ROUTE_CLASSID 359 case NFT_META_RTCLASSID: 360 if (!nft_meta_get_eval_rtclassid(skb, dest)) 361 goto err; 362 break; 363 #endif 364 #ifdef CONFIG_NETWORK_SECMARK 365 case NFT_META_SECMARK: 366 *dest = skb->secmark; 367 break; 368 #endif 369 case NFT_META_PKTTYPE: 370 if (skb->pkt_type != PACKET_LOOPBACK) { 371 nft_reg_store8(dest, skb->pkt_type); 372 break; 373 } 374 375 if (!nft_meta_get_eval_pkttype_lo(pkt, dest)) 376 goto err; 377 break; 378 case NFT_META_CPU: 379 *dest = raw_smp_processor_id(); 380 break; 381 #ifdef CONFIG_CGROUP_NET_CLASSID 382 case NFT_META_CGROUP: 383 if (!nft_meta_get_eval_cgroup(dest, pkt)) 384 goto err; 385 break; 386 #endif 387 case NFT_META_PRANDOM: 388 *dest = nft_prandom_u32(); 389 break; 390 #ifdef CONFIG_XFRM 391 case NFT_META_SECPATH: 392 nft_reg_store8(dest, secpath_exists(skb)); 393 break; 394 #endif 395 case NFT_META_IIFKIND: 396 case NFT_META_OIFKIND: 397 if (!nft_meta_get_eval_kind(priv->key, dest, pkt)) 398 goto err; 399 break; 400 case NFT_META_TIME_NS: 401 case NFT_META_TIME_DAY: 402 case NFT_META_TIME_HOUR: 403 nft_meta_get_eval_time(priv->key, dest); 404 break; 405 case NFT_META_SDIF: 406 *dest = nft_meta_get_eval_sdif(pkt); 407 break; 408 case NFT_META_SDIFNAME: 409 nft_meta_get_eval_sdifname(dest, pkt); 410 break; 411 default: 412 WARN_ON(1); 413 goto err; 414 } 415 return; 416 417 err: 418 regs->verdict.code = NFT_BREAK; 419 } 420 EXPORT_SYMBOL_GPL(nft_meta_get_eval); 421 422 void nft_meta_set_eval(const struct nft_expr *expr, 423 struct nft_regs *regs, 424 const struct nft_pktinfo *pkt) 425 { 426 const struct nft_meta *meta = nft_expr_priv(expr); 427 struct sk_buff *skb = pkt->skb; 428 u32 *sreg = ®s->data[meta->sreg]; 429 u32 value = *sreg; 430 u8 value8; 431 432 switch (meta->key) { 433 case NFT_META_MARK: 434 skb->mark = value; 435 break; 436 case NFT_META_PRIORITY: 437 skb->priority = value; 438 break; 439 case NFT_META_PKTTYPE: 440 value8 = nft_reg_load8(sreg); 441 442 if (skb->pkt_type != value8 && 443 skb_pkt_type_ok(value8) && 444 skb_pkt_type_ok(skb->pkt_type)) 445 skb->pkt_type = value8; 446 break; 447 case NFT_META_NFTRACE: 448 value8 = nft_reg_load8(sreg); 449 450 skb->nf_trace = !!value8; 451 break; 452 #ifdef CONFIG_NETWORK_SECMARK 453 case NFT_META_SECMARK: 454 skb->secmark = value; 455 break; 456 #endif 457 default: 458 WARN_ON(1); 459 } 460 } 461 EXPORT_SYMBOL_GPL(nft_meta_set_eval); 462 463 const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = { 464 [NFTA_META_DREG] = { .type = NLA_U32 }, 465 [NFTA_META_KEY] = { .type = NLA_U32 }, 466 [NFTA_META_SREG] = { .type = NLA_U32 }, 467 }; 468 EXPORT_SYMBOL_GPL(nft_meta_policy); 469 470 int nft_meta_get_init(const struct nft_ctx *ctx, 471 const struct nft_expr *expr, 472 const struct nlattr * const tb[]) 473 { 474 struct nft_meta *priv = nft_expr_priv(expr); 475 unsigned int len; 476 477 priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY])); 478 switch (priv->key) { 479 case NFT_META_PROTOCOL: 480 case NFT_META_IIFTYPE: 481 case NFT_META_OIFTYPE: 482 len = sizeof(u16); 483 break; 484 case NFT_META_NFPROTO: 485 case NFT_META_L4PROTO: 486 case NFT_META_LEN: 487 case NFT_META_PRIORITY: 488 case NFT_META_MARK: 489 case NFT_META_IIF: 490 case NFT_META_OIF: 491 case NFT_META_SDIF: 492 case NFT_META_SKUID: 493 case NFT_META_SKGID: 494 #ifdef CONFIG_IP_ROUTE_CLASSID 495 case NFT_META_RTCLASSID: 496 #endif 497 #ifdef CONFIG_NETWORK_SECMARK 498 case NFT_META_SECMARK: 499 #endif 500 case NFT_META_PKTTYPE: 501 case NFT_META_CPU: 502 case NFT_META_IIFGROUP: 503 case NFT_META_OIFGROUP: 504 #ifdef CONFIG_CGROUP_NET_CLASSID 505 case NFT_META_CGROUP: 506 #endif 507 len = sizeof(u32); 508 break; 509 case NFT_META_IIFNAME: 510 case NFT_META_OIFNAME: 511 case NFT_META_IIFKIND: 512 case NFT_META_OIFKIND: 513 case NFT_META_SDIFNAME: 514 len = IFNAMSIZ; 515 break; 516 case NFT_META_PRANDOM: 517 prandom_init_once(&nft_prandom_state); 518 len = sizeof(u32); 519 break; 520 #ifdef CONFIG_XFRM 521 case NFT_META_SECPATH: 522 len = sizeof(u8); 523 break; 524 #endif 525 case NFT_META_TIME_NS: 526 len = sizeof(u64); 527 break; 528 case NFT_META_TIME_DAY: 529 len = sizeof(u8); 530 break; 531 case NFT_META_TIME_HOUR: 532 len = sizeof(u32); 533 break; 534 default: 535 return -EOPNOTSUPP; 536 } 537 538 return nft_parse_register_store(ctx, tb[NFTA_META_DREG], &priv->dreg, 539 NULL, NFT_DATA_VALUE, len); 540 } 541 EXPORT_SYMBOL_GPL(nft_meta_get_init); 542 543 static int nft_meta_get_validate_sdif(const struct nft_ctx *ctx) 544 { 545 unsigned int hooks; 546 547 switch (ctx->family) { 548 case NFPROTO_IPV4: 549 case NFPROTO_IPV6: 550 case NFPROTO_INET: 551 hooks = (1 << NF_INET_LOCAL_IN) | 552 (1 << NF_INET_FORWARD); 553 break; 554 default: 555 return -EOPNOTSUPP; 556 } 557 558 return nft_chain_validate_hooks(ctx->chain, hooks); 559 } 560 561 static int nft_meta_get_validate_xfrm(const struct nft_ctx *ctx) 562 { 563 #ifdef CONFIG_XFRM 564 unsigned int hooks; 565 566 switch (ctx->family) { 567 case NFPROTO_NETDEV: 568 hooks = 1 << NF_NETDEV_INGRESS; 569 break; 570 case NFPROTO_IPV4: 571 case NFPROTO_IPV6: 572 case NFPROTO_INET: 573 hooks = (1 << NF_INET_PRE_ROUTING) | 574 (1 << NF_INET_LOCAL_IN) | 575 (1 << NF_INET_FORWARD); 576 break; 577 default: 578 return -EOPNOTSUPP; 579 } 580 581 return nft_chain_validate_hooks(ctx->chain, hooks); 582 #else 583 return 0; 584 #endif 585 } 586 587 static int nft_meta_get_validate(const struct nft_ctx *ctx, 588 const struct nft_expr *expr, 589 const struct nft_data **data) 590 { 591 const struct nft_meta *priv = nft_expr_priv(expr); 592 593 switch (priv->key) { 594 case NFT_META_SECPATH: 595 return nft_meta_get_validate_xfrm(ctx); 596 case NFT_META_SDIF: 597 case NFT_META_SDIFNAME: 598 return nft_meta_get_validate_sdif(ctx); 599 default: 600 break; 601 } 602 603 return 0; 604 } 605 606 int nft_meta_set_validate(const struct nft_ctx *ctx, 607 const struct nft_expr *expr, 608 const struct nft_data **data) 609 { 610 struct nft_meta *priv = nft_expr_priv(expr); 611 unsigned int hooks; 612 613 if (priv->key != NFT_META_PKTTYPE) 614 return 0; 615 616 switch (ctx->family) { 617 case NFPROTO_BRIDGE: 618 hooks = 1 << NF_BR_PRE_ROUTING; 619 break; 620 case NFPROTO_NETDEV: 621 hooks = 1 << NF_NETDEV_INGRESS; 622 break; 623 case NFPROTO_IPV4: 624 case NFPROTO_IPV6: 625 case NFPROTO_INET: 626 hooks = 1 << NF_INET_PRE_ROUTING; 627 break; 628 default: 629 return -EOPNOTSUPP; 630 } 631 632 return nft_chain_validate_hooks(ctx->chain, hooks); 633 } 634 EXPORT_SYMBOL_GPL(nft_meta_set_validate); 635 636 int nft_meta_set_init(const struct nft_ctx *ctx, 637 const struct nft_expr *expr, 638 const struct nlattr * const tb[]) 639 { 640 struct nft_meta *priv = nft_expr_priv(expr); 641 unsigned int len; 642 int err; 643 644 priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY])); 645 switch (priv->key) { 646 case NFT_META_MARK: 647 case NFT_META_PRIORITY: 648 #ifdef CONFIG_NETWORK_SECMARK 649 case NFT_META_SECMARK: 650 #endif 651 len = sizeof(u32); 652 break; 653 case NFT_META_NFTRACE: 654 len = sizeof(u8); 655 break; 656 case NFT_META_PKTTYPE: 657 len = sizeof(u8); 658 break; 659 default: 660 return -EOPNOTSUPP; 661 } 662 663 err = nft_parse_register_load(tb[NFTA_META_SREG], &priv->sreg, len); 664 if (err < 0) 665 return err; 666 667 if (priv->key == NFT_META_NFTRACE) 668 static_branch_inc(&nft_trace_enabled); 669 670 return 0; 671 } 672 EXPORT_SYMBOL_GPL(nft_meta_set_init); 673 674 int nft_meta_get_dump(struct sk_buff *skb, 675 const struct nft_expr *expr) 676 { 677 const struct nft_meta *priv = nft_expr_priv(expr); 678 679 if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key))) 680 goto nla_put_failure; 681 if (nft_dump_register(skb, NFTA_META_DREG, priv->dreg)) 682 goto nla_put_failure; 683 return 0; 684 685 nla_put_failure: 686 return -1; 687 } 688 EXPORT_SYMBOL_GPL(nft_meta_get_dump); 689 690 int nft_meta_set_dump(struct sk_buff *skb, const struct nft_expr *expr) 691 { 692 const struct nft_meta *priv = nft_expr_priv(expr); 693 694 if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key))) 695 goto nla_put_failure; 696 if (nft_dump_register(skb, NFTA_META_SREG, priv->sreg)) 697 goto nla_put_failure; 698 699 return 0; 700 701 nla_put_failure: 702 return -1; 703 } 704 EXPORT_SYMBOL_GPL(nft_meta_set_dump); 705 706 void nft_meta_set_destroy(const struct nft_ctx *ctx, 707 const struct nft_expr *expr) 708 { 709 const struct nft_meta *priv = nft_expr_priv(expr); 710 711 if (priv->key == NFT_META_NFTRACE) 712 static_branch_dec(&nft_trace_enabled); 713 } 714 EXPORT_SYMBOL_GPL(nft_meta_set_destroy); 715 716 static int nft_meta_get_offload(struct nft_offload_ctx *ctx, 717 struct nft_flow_rule *flow, 718 const struct nft_expr *expr) 719 { 720 const struct nft_meta *priv = nft_expr_priv(expr); 721 struct nft_offload_reg *reg = &ctx->regs[priv->dreg]; 722 723 switch (priv->key) { 724 case NFT_META_PROTOCOL: 725 NFT_OFFLOAD_MATCH_EXACT(FLOW_DISSECTOR_KEY_BASIC, basic, n_proto, 726 sizeof(__u16), reg); 727 nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_NETWORK); 728 break; 729 case NFT_META_L4PROTO: 730 NFT_OFFLOAD_MATCH_EXACT(FLOW_DISSECTOR_KEY_BASIC, basic, ip_proto, 731 sizeof(__u8), reg); 732 nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_TRANSPORT); 733 break; 734 case NFT_META_IIF: 735 NFT_OFFLOAD_MATCH_EXACT(FLOW_DISSECTOR_KEY_META, meta, 736 ingress_ifindex, sizeof(__u32), reg); 737 break; 738 case NFT_META_IIFTYPE: 739 NFT_OFFLOAD_MATCH_EXACT(FLOW_DISSECTOR_KEY_META, meta, 740 ingress_iftype, sizeof(__u16), reg); 741 break; 742 default: 743 return -EOPNOTSUPP; 744 } 745 746 return 0; 747 } 748 749 static const struct nft_expr_ops nft_meta_get_ops = { 750 .type = &nft_meta_type, 751 .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)), 752 .eval = nft_meta_get_eval, 753 .init = nft_meta_get_init, 754 .dump = nft_meta_get_dump, 755 .validate = nft_meta_get_validate, 756 .offload = nft_meta_get_offload, 757 }; 758 759 static const struct nft_expr_ops nft_meta_set_ops = { 760 .type = &nft_meta_type, 761 .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)), 762 .eval = nft_meta_set_eval, 763 .init = nft_meta_set_init, 764 .destroy = nft_meta_set_destroy, 765 .dump = nft_meta_set_dump, 766 .validate = nft_meta_set_validate, 767 }; 768 769 static const struct nft_expr_ops * 770 nft_meta_select_ops(const struct nft_ctx *ctx, 771 const struct nlattr * const tb[]) 772 { 773 if (tb[NFTA_META_KEY] == NULL) 774 return ERR_PTR(-EINVAL); 775 776 if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG]) 777 return ERR_PTR(-EINVAL); 778 779 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE) && IS_MODULE(CONFIG_NFT_BRIDGE_META) 780 if (ctx->family == NFPROTO_BRIDGE) 781 return ERR_PTR(-EAGAIN); 782 #endif 783 if (tb[NFTA_META_DREG]) 784 return &nft_meta_get_ops; 785 786 if (tb[NFTA_META_SREG]) 787 return &nft_meta_set_ops; 788 789 return ERR_PTR(-EINVAL); 790 } 791 792 struct nft_expr_type nft_meta_type __read_mostly = { 793 .name = "meta", 794 .select_ops = nft_meta_select_ops, 795 .policy = nft_meta_policy, 796 .maxattr = NFTA_META_MAX, 797 .owner = THIS_MODULE, 798 }; 799 800 #ifdef CONFIG_NETWORK_SECMARK 801 struct nft_secmark { 802 u32 secid; 803 char *ctx; 804 }; 805 806 static const struct nla_policy nft_secmark_policy[NFTA_SECMARK_MAX + 1] = { 807 [NFTA_SECMARK_CTX] = { .type = NLA_STRING, .len = NFT_SECMARK_CTX_MAXLEN }, 808 }; 809 810 static int nft_secmark_compute_secid(struct nft_secmark *priv) 811 { 812 u32 tmp_secid = 0; 813 int err; 814 815 err = security_secctx_to_secid(priv->ctx, strlen(priv->ctx), &tmp_secid); 816 if (err) 817 return err; 818 819 if (!tmp_secid) 820 return -ENOENT; 821 822 err = security_secmark_relabel_packet(tmp_secid); 823 if (err) 824 return err; 825 826 priv->secid = tmp_secid; 827 return 0; 828 } 829 830 static void nft_secmark_obj_eval(struct nft_object *obj, struct nft_regs *regs, 831 const struct nft_pktinfo *pkt) 832 { 833 const struct nft_secmark *priv = nft_obj_data(obj); 834 struct sk_buff *skb = pkt->skb; 835 836 skb->secmark = priv->secid; 837 } 838 839 static int nft_secmark_obj_init(const struct nft_ctx *ctx, 840 const struct nlattr * const tb[], 841 struct nft_object *obj) 842 { 843 struct nft_secmark *priv = nft_obj_data(obj); 844 int err; 845 846 if (tb[NFTA_SECMARK_CTX] == NULL) 847 return -EINVAL; 848 849 priv->ctx = nla_strdup(tb[NFTA_SECMARK_CTX], GFP_KERNEL); 850 if (!priv->ctx) 851 return -ENOMEM; 852 853 err = nft_secmark_compute_secid(priv); 854 if (err) { 855 kfree(priv->ctx); 856 return err; 857 } 858 859 security_secmark_refcount_inc(); 860 861 return 0; 862 } 863 864 static int nft_secmark_obj_dump(struct sk_buff *skb, struct nft_object *obj, 865 bool reset) 866 { 867 struct nft_secmark *priv = nft_obj_data(obj); 868 int err; 869 870 if (nla_put_string(skb, NFTA_SECMARK_CTX, priv->ctx)) 871 return -1; 872 873 if (reset) { 874 err = nft_secmark_compute_secid(priv); 875 if (err) 876 return err; 877 } 878 879 return 0; 880 } 881 882 static void nft_secmark_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj) 883 { 884 struct nft_secmark *priv = nft_obj_data(obj); 885 886 security_secmark_refcount_dec(); 887 888 kfree(priv->ctx); 889 } 890 891 static const struct nft_object_ops nft_secmark_obj_ops = { 892 .type = &nft_secmark_obj_type, 893 .size = sizeof(struct nft_secmark), 894 .init = nft_secmark_obj_init, 895 .eval = nft_secmark_obj_eval, 896 .dump = nft_secmark_obj_dump, 897 .destroy = nft_secmark_obj_destroy, 898 }; 899 struct nft_object_type nft_secmark_obj_type __read_mostly = { 900 .type = NFT_OBJECT_SECMARK, 901 .ops = &nft_secmark_obj_ops, 902 .maxattr = NFTA_SECMARK_MAX, 903 .policy = nft_secmark_policy, 904 .owner = THIS_MODULE, 905 }; 906 #endif /* CONFIG_NETWORK_SECMARK */ 907