1 /* 2 * inet_diag.c Module for monitoring INET transport protocols sockets. 3 * 4 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11 12 #include <linux/kernel.h> 13 #include <linux/module.h> 14 #include <linux/types.h> 15 #include <linux/fcntl.h> 16 #include <linux/random.h> 17 #include <linux/slab.h> 18 #include <linux/cache.h> 19 #include <linux/init.h> 20 #include <linux/time.h> 21 22 #include <net/icmp.h> 23 #include <net/tcp.h> 24 #include <net/ipv6.h> 25 #include <net/inet_common.h> 26 #include <net/inet_connection_sock.h> 27 #include <net/inet_hashtables.h> 28 #include <net/inet_timewait_sock.h> 29 #include <net/inet6_hashtables.h> 30 #include <net/netlink.h> 31 32 #include <linux/inet.h> 33 #include <linux/stddef.h> 34 35 #include <linux/inet_diag.h> 36 #include <linux/sock_diag.h> 37 38 static const struct inet_diag_handler **inet_diag_table; 39 40 struct inet_diag_entry { 41 const __be32 *saddr; 42 const __be32 *daddr; 43 u16 sport; 44 u16 dport; 45 u16 family; 46 u16 userlocks; 47 }; 48 49 static DEFINE_MUTEX(inet_diag_table_mutex); 50 51 static const struct inet_diag_handler *inet_diag_lock_handler(int proto) 52 { 53 if (!inet_diag_table[proto]) 54 request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK, 55 NETLINK_SOCK_DIAG, AF_INET, proto); 56 57 mutex_lock(&inet_diag_table_mutex); 58 if (!inet_diag_table[proto]) 59 return ERR_PTR(-ENOENT); 60 61 return inet_diag_table[proto]; 62 } 63 64 static void inet_diag_unlock_handler(const struct inet_diag_handler *handler) 65 { 66 mutex_unlock(&inet_diag_table_mutex); 67 } 68 69 static void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk) 70 { 71 r->idiag_family = sk->sk_family; 72 73 r->id.idiag_sport = htons(sk->sk_num); 74 r->id.idiag_dport = sk->sk_dport; 75 r->id.idiag_if = sk->sk_bound_dev_if; 76 sock_diag_save_cookie(sk, r->id.idiag_cookie); 77 78 #if IS_ENABLED(CONFIG_IPV6) 79 if (sk->sk_family == AF_INET6) { 80 *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr; 81 *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr; 82 } else 83 #endif 84 { 85 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src)); 86 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst)); 87 88 r->id.idiag_src[0] = sk->sk_rcv_saddr; 89 r->id.idiag_dst[0] = sk->sk_daddr; 90 } 91 } 92 93 static size_t inet_sk_attr_size(void) 94 { 95 return nla_total_size(sizeof(struct tcp_info)) 96 + nla_total_size(1) /* INET_DIAG_SHUTDOWN */ 97 + nla_total_size(1) /* INET_DIAG_TOS */ 98 + nla_total_size(1) /* INET_DIAG_TCLASS */ 99 + nla_total_size(sizeof(struct inet_diag_meminfo)) 100 + nla_total_size(sizeof(struct inet_diag_msg)) 101 + nla_total_size(SK_MEMINFO_VARS * sizeof(u32)) 102 + nla_total_size(TCP_CA_NAME_MAX) 103 + nla_total_size(sizeof(struct tcpvegas_info)) 104 + 64; 105 } 106 107 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk, 108 struct sk_buff *skb, const struct inet_diag_req_v2 *req, 109 struct user_namespace *user_ns, 110 u32 portid, u32 seq, u16 nlmsg_flags, 111 const struct nlmsghdr *unlh) 112 { 113 const struct inet_sock *inet = inet_sk(sk); 114 const struct tcp_congestion_ops *ca_ops; 115 const struct inet_diag_handler *handler; 116 int ext = req->idiag_ext; 117 struct inet_diag_msg *r; 118 struct nlmsghdr *nlh; 119 struct nlattr *attr; 120 void *info = NULL; 121 122 handler = inet_diag_table[req->sdiag_protocol]; 123 BUG_ON(!handler); 124 125 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r), 126 nlmsg_flags); 127 if (!nlh) 128 return -EMSGSIZE; 129 130 r = nlmsg_data(nlh); 131 BUG_ON(!sk_fullsock(sk)); 132 133 inet_diag_msg_common_fill(r, sk); 134 r->idiag_state = sk->sk_state; 135 r->idiag_timer = 0; 136 r->idiag_retrans = 0; 137 138 if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown)) 139 goto errout; 140 141 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections, 142 * hence this needs to be included regardless of socket family. 143 */ 144 if (ext & (1 << (INET_DIAG_TOS - 1))) 145 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0) 146 goto errout; 147 148 #if IS_ENABLED(CONFIG_IPV6) 149 if (r->idiag_family == AF_INET6) { 150 if (ext & (1 << (INET_DIAG_TCLASS - 1))) 151 if (nla_put_u8(skb, INET_DIAG_TCLASS, 152 inet6_sk(sk)->tclass) < 0) 153 goto errout; 154 155 if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) && 156 nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk))) 157 goto errout; 158 } 159 #endif 160 161 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk)); 162 r->idiag_inode = sock_i_ino(sk); 163 164 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) { 165 struct inet_diag_meminfo minfo = { 166 .idiag_rmem = sk_rmem_alloc_get(sk), 167 .idiag_wmem = sk->sk_wmem_queued, 168 .idiag_fmem = sk->sk_forward_alloc, 169 .idiag_tmem = sk_wmem_alloc_get(sk), 170 }; 171 172 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0) 173 goto errout; 174 } 175 176 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1))) 177 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO)) 178 goto errout; 179 180 if (!icsk) { 181 handler->idiag_get_info(sk, r, NULL); 182 goto out; 183 } 184 185 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ) 186 187 if (icsk->icsk_pending == ICSK_TIME_RETRANS || 188 icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS || 189 icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) { 190 r->idiag_timer = 1; 191 r->idiag_retrans = icsk->icsk_retransmits; 192 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 193 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { 194 r->idiag_timer = 4; 195 r->idiag_retrans = icsk->icsk_probes_out; 196 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 197 } else if (timer_pending(&sk->sk_timer)) { 198 r->idiag_timer = 2; 199 r->idiag_retrans = icsk->icsk_probes_out; 200 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires); 201 } else { 202 r->idiag_timer = 0; 203 r->idiag_expires = 0; 204 } 205 #undef EXPIRES_IN_MS 206 207 if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) { 208 attr = nla_reserve(skb, INET_DIAG_INFO, 209 handler->idiag_info_size); 210 if (!attr) 211 goto errout; 212 213 info = nla_data(attr); 214 } 215 216 if (ext & (1 << (INET_DIAG_CONG - 1))) { 217 int err = 0; 218 219 rcu_read_lock(); 220 ca_ops = READ_ONCE(icsk->icsk_ca_ops); 221 if (ca_ops) 222 err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name); 223 rcu_read_unlock(); 224 if (err < 0) 225 goto errout; 226 } 227 228 handler->idiag_get_info(sk, r, info); 229 230 if (sk->sk_state < TCP_TIME_WAIT) { 231 union tcp_cc_info info; 232 size_t sz = 0; 233 int attr; 234 235 rcu_read_lock(); 236 ca_ops = READ_ONCE(icsk->icsk_ca_ops); 237 if (ca_ops && ca_ops->get_info) 238 sz = ca_ops->get_info(sk, ext, &attr, &info); 239 rcu_read_unlock(); 240 if (sz && nla_put(skb, attr, sz, &info) < 0) 241 goto errout; 242 } 243 244 out: 245 nlmsg_end(skb, nlh); 246 return 0; 247 248 errout: 249 nlmsg_cancel(skb, nlh); 250 return -EMSGSIZE; 251 } 252 EXPORT_SYMBOL_GPL(inet_sk_diag_fill); 253 254 static int inet_csk_diag_fill(struct sock *sk, 255 struct sk_buff *skb, 256 const struct inet_diag_req_v2 *req, 257 struct user_namespace *user_ns, 258 u32 portid, u32 seq, u16 nlmsg_flags, 259 const struct nlmsghdr *unlh) 260 { 261 return inet_sk_diag_fill(sk, inet_csk(sk), skb, req, 262 user_ns, portid, seq, nlmsg_flags, unlh); 263 } 264 265 static int inet_twsk_diag_fill(struct sock *sk, 266 struct sk_buff *skb, 267 u32 portid, u32 seq, u16 nlmsg_flags, 268 const struct nlmsghdr *unlh) 269 { 270 struct inet_timewait_sock *tw = inet_twsk(sk); 271 struct inet_diag_msg *r; 272 struct nlmsghdr *nlh; 273 long tmo; 274 275 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r), 276 nlmsg_flags); 277 if (!nlh) 278 return -EMSGSIZE; 279 280 r = nlmsg_data(nlh); 281 BUG_ON(tw->tw_state != TCP_TIME_WAIT); 282 283 tmo = tw->tw_timer.expires - jiffies; 284 if (tmo < 0) 285 tmo = 0; 286 287 inet_diag_msg_common_fill(r, sk); 288 r->idiag_retrans = 0; 289 290 r->idiag_state = tw->tw_substate; 291 r->idiag_timer = 3; 292 r->idiag_expires = jiffies_to_msecs(tmo); 293 r->idiag_rqueue = 0; 294 r->idiag_wqueue = 0; 295 r->idiag_uid = 0; 296 r->idiag_inode = 0; 297 298 nlmsg_end(skb, nlh); 299 return 0; 300 } 301 302 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb, 303 u32 portid, u32 seq, u16 nlmsg_flags, 304 const struct nlmsghdr *unlh) 305 { 306 struct inet_diag_msg *r; 307 struct nlmsghdr *nlh; 308 long tmo; 309 310 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r), 311 nlmsg_flags); 312 if (!nlh) 313 return -EMSGSIZE; 314 315 r = nlmsg_data(nlh); 316 inet_diag_msg_common_fill(r, sk); 317 r->idiag_state = TCP_SYN_RECV; 318 r->idiag_timer = 1; 319 r->idiag_retrans = inet_reqsk(sk)->num_retrans; 320 321 BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) != 322 offsetof(struct sock, sk_cookie)); 323 324 tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies; 325 r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0; 326 r->idiag_rqueue = 0; 327 r->idiag_wqueue = 0; 328 r->idiag_uid = 0; 329 r->idiag_inode = 0; 330 331 nlmsg_end(skb, nlh); 332 return 0; 333 } 334 335 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, 336 const struct inet_diag_req_v2 *r, 337 struct user_namespace *user_ns, 338 u32 portid, u32 seq, u16 nlmsg_flags, 339 const struct nlmsghdr *unlh) 340 { 341 if (sk->sk_state == TCP_TIME_WAIT) 342 return inet_twsk_diag_fill(sk, skb, portid, seq, 343 nlmsg_flags, unlh); 344 345 if (sk->sk_state == TCP_NEW_SYN_RECV) 346 return inet_req_diag_fill(sk, skb, portid, seq, 347 nlmsg_flags, unlh); 348 349 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq, 350 nlmsg_flags, unlh); 351 } 352 353 struct sock *inet_diag_find_one_icsk(struct net *net, 354 struct inet_hashinfo *hashinfo, 355 const struct inet_diag_req_v2 *req) 356 { 357 struct sock *sk; 358 359 if (req->sdiag_family == AF_INET) 360 sk = inet_lookup(net, hashinfo, req->id.idiag_dst[0], 361 req->id.idiag_dport, req->id.idiag_src[0], 362 req->id.idiag_sport, req->id.idiag_if); 363 #if IS_ENABLED(CONFIG_IPV6) 364 else if (req->sdiag_family == AF_INET6) 365 sk = inet6_lookup(net, hashinfo, 366 (struct in6_addr *)req->id.idiag_dst, 367 req->id.idiag_dport, 368 (struct in6_addr *)req->id.idiag_src, 369 req->id.idiag_sport, 370 req->id.idiag_if); 371 #endif 372 else 373 return ERR_PTR(-EINVAL); 374 375 if (!sk) 376 return ERR_PTR(-ENOENT); 377 378 if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) { 379 sock_gen_put(sk); 380 return ERR_PTR(-ENOENT); 381 } 382 383 return sk; 384 } 385 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk); 386 387 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, 388 struct sk_buff *in_skb, 389 const struct nlmsghdr *nlh, 390 const struct inet_diag_req_v2 *req) 391 { 392 struct net *net = sock_net(in_skb->sk); 393 struct sk_buff *rep; 394 struct sock *sk; 395 int err; 396 397 sk = inet_diag_find_one_icsk(net, hashinfo, req); 398 if (IS_ERR(sk)) 399 return PTR_ERR(sk); 400 401 rep = nlmsg_new(inet_sk_attr_size(), GFP_KERNEL); 402 if (!rep) { 403 err = -ENOMEM; 404 goto out; 405 } 406 407 err = sk_diag_fill(sk, rep, req, 408 sk_user_ns(NETLINK_CB(in_skb).sk), 409 NETLINK_CB(in_skb).portid, 410 nlh->nlmsg_seq, 0, nlh); 411 if (err < 0) { 412 WARN_ON(err == -EMSGSIZE); 413 nlmsg_free(rep); 414 goto out; 415 } 416 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid, 417 MSG_DONTWAIT); 418 if (err > 0) 419 err = 0; 420 421 out: 422 if (sk) 423 sock_gen_put(sk); 424 425 return err; 426 } 427 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk); 428 429 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb, 430 const struct nlmsghdr *nlh, 431 const struct inet_diag_req_v2 *req) 432 { 433 const struct inet_diag_handler *handler; 434 int err; 435 436 handler = inet_diag_lock_handler(req->sdiag_protocol); 437 if (IS_ERR(handler)) 438 err = PTR_ERR(handler); 439 else if (cmd == SOCK_DIAG_BY_FAMILY) 440 err = handler->dump_one(in_skb, nlh, req); 441 else if (cmd == SOCK_DESTROY && handler->destroy) 442 err = handler->destroy(in_skb, req); 443 else 444 err = -EOPNOTSUPP; 445 inet_diag_unlock_handler(handler); 446 447 return err; 448 } 449 450 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits) 451 { 452 int words = bits >> 5; 453 454 bits &= 0x1f; 455 456 if (words) { 457 if (memcmp(a1, a2, words << 2)) 458 return 0; 459 } 460 if (bits) { 461 __be32 w1, w2; 462 __be32 mask; 463 464 w1 = a1[words]; 465 w2 = a2[words]; 466 467 mask = htonl((0xffffffff) << (32 - bits)); 468 469 if ((w1 ^ w2) & mask) 470 return 0; 471 } 472 473 return 1; 474 } 475 476 static int inet_diag_bc_run(const struct nlattr *_bc, 477 const struct inet_diag_entry *entry) 478 { 479 const void *bc = nla_data(_bc); 480 int len = nla_len(_bc); 481 482 while (len > 0) { 483 int yes = 1; 484 const struct inet_diag_bc_op *op = bc; 485 486 switch (op->code) { 487 case INET_DIAG_BC_NOP: 488 break; 489 case INET_DIAG_BC_JMP: 490 yes = 0; 491 break; 492 case INET_DIAG_BC_S_GE: 493 yes = entry->sport >= op[1].no; 494 break; 495 case INET_DIAG_BC_S_LE: 496 yes = entry->sport <= op[1].no; 497 break; 498 case INET_DIAG_BC_D_GE: 499 yes = entry->dport >= op[1].no; 500 break; 501 case INET_DIAG_BC_D_LE: 502 yes = entry->dport <= op[1].no; 503 break; 504 case INET_DIAG_BC_AUTO: 505 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); 506 break; 507 case INET_DIAG_BC_S_COND: 508 case INET_DIAG_BC_D_COND: { 509 const struct inet_diag_hostcond *cond; 510 const __be32 *addr; 511 512 cond = (const struct inet_diag_hostcond *)(op + 1); 513 if (cond->port != -1 && 514 cond->port != (op->code == INET_DIAG_BC_S_COND ? 515 entry->sport : entry->dport)) { 516 yes = 0; 517 break; 518 } 519 520 if (op->code == INET_DIAG_BC_S_COND) 521 addr = entry->saddr; 522 else 523 addr = entry->daddr; 524 525 if (cond->family != AF_UNSPEC && 526 cond->family != entry->family) { 527 if (entry->family == AF_INET6 && 528 cond->family == AF_INET) { 529 if (addr[0] == 0 && addr[1] == 0 && 530 addr[2] == htonl(0xffff) && 531 bitstring_match(addr + 3, 532 cond->addr, 533 cond->prefix_len)) 534 break; 535 } 536 yes = 0; 537 break; 538 } 539 540 if (cond->prefix_len == 0) 541 break; 542 if (bitstring_match(addr, cond->addr, 543 cond->prefix_len)) 544 break; 545 yes = 0; 546 break; 547 } 548 } 549 550 if (yes) { 551 len -= op->yes; 552 bc += op->yes; 553 } else { 554 len -= op->no; 555 bc += op->no; 556 } 557 } 558 return len == 0; 559 } 560 561 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV) 562 */ 563 static void entry_fill_addrs(struct inet_diag_entry *entry, 564 const struct sock *sk) 565 { 566 #if IS_ENABLED(CONFIG_IPV6) 567 if (sk->sk_family == AF_INET6) { 568 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32; 569 entry->daddr = sk->sk_v6_daddr.s6_addr32; 570 } else 571 #endif 572 { 573 entry->saddr = &sk->sk_rcv_saddr; 574 entry->daddr = &sk->sk_daddr; 575 } 576 } 577 578 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk) 579 { 580 struct inet_sock *inet = inet_sk(sk); 581 struct inet_diag_entry entry; 582 583 if (!bc) 584 return 1; 585 586 entry.family = sk->sk_family; 587 entry_fill_addrs(&entry, sk); 588 entry.sport = inet->inet_num; 589 entry.dport = ntohs(inet->inet_dport); 590 entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0; 591 592 return inet_diag_bc_run(bc, &entry); 593 } 594 EXPORT_SYMBOL_GPL(inet_diag_bc_sk); 595 596 static int valid_cc(const void *bc, int len, int cc) 597 { 598 while (len >= 0) { 599 const struct inet_diag_bc_op *op = bc; 600 601 if (cc > len) 602 return 0; 603 if (cc == len) 604 return 1; 605 if (op->yes < 4 || op->yes & 3) 606 return 0; 607 len -= op->yes; 608 bc += op->yes; 609 } 610 return 0; 611 } 612 613 /* Validate an inet_diag_hostcond. */ 614 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len, 615 int *min_len) 616 { 617 struct inet_diag_hostcond *cond; 618 int addr_len; 619 620 /* Check hostcond space. */ 621 *min_len += sizeof(struct inet_diag_hostcond); 622 if (len < *min_len) 623 return false; 624 cond = (struct inet_diag_hostcond *)(op + 1); 625 626 /* Check address family and address length. */ 627 switch (cond->family) { 628 case AF_UNSPEC: 629 addr_len = 0; 630 break; 631 case AF_INET: 632 addr_len = sizeof(struct in_addr); 633 break; 634 case AF_INET6: 635 addr_len = sizeof(struct in6_addr); 636 break; 637 default: 638 return false; 639 } 640 *min_len += addr_len; 641 if (len < *min_len) 642 return false; 643 644 /* Check prefix length (in bits) vs address length (in bytes). */ 645 if (cond->prefix_len > 8 * addr_len) 646 return false; 647 648 return true; 649 } 650 651 /* Validate a port comparison operator. */ 652 static bool valid_port_comparison(const struct inet_diag_bc_op *op, 653 int len, int *min_len) 654 { 655 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */ 656 *min_len += sizeof(struct inet_diag_bc_op); 657 if (len < *min_len) 658 return false; 659 return true; 660 } 661 662 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len) 663 { 664 const void *bc = bytecode; 665 int len = bytecode_len; 666 667 while (len > 0) { 668 int min_len = sizeof(struct inet_diag_bc_op); 669 const struct inet_diag_bc_op *op = bc; 670 671 switch (op->code) { 672 case INET_DIAG_BC_S_COND: 673 case INET_DIAG_BC_D_COND: 674 if (!valid_hostcond(bc, len, &min_len)) 675 return -EINVAL; 676 break; 677 case INET_DIAG_BC_S_GE: 678 case INET_DIAG_BC_S_LE: 679 case INET_DIAG_BC_D_GE: 680 case INET_DIAG_BC_D_LE: 681 if (!valid_port_comparison(bc, len, &min_len)) 682 return -EINVAL; 683 break; 684 case INET_DIAG_BC_AUTO: 685 case INET_DIAG_BC_JMP: 686 case INET_DIAG_BC_NOP: 687 break; 688 default: 689 return -EINVAL; 690 } 691 692 if (op->code != INET_DIAG_BC_NOP) { 693 if (op->no < min_len || op->no > len + 4 || op->no & 3) 694 return -EINVAL; 695 if (op->no < len && 696 !valid_cc(bytecode, bytecode_len, len - op->no)) 697 return -EINVAL; 698 } 699 700 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3) 701 return -EINVAL; 702 bc += op->yes; 703 len -= op->yes; 704 } 705 return len == 0 ? 0 : -EINVAL; 706 } 707 708 static int inet_csk_diag_dump(struct sock *sk, 709 struct sk_buff *skb, 710 struct netlink_callback *cb, 711 const struct inet_diag_req_v2 *r, 712 const struct nlattr *bc) 713 { 714 if (!inet_diag_bc_sk(bc, sk)) 715 return 0; 716 717 return inet_csk_diag_fill(sk, skb, r, 718 sk_user_ns(NETLINK_CB(cb->skb).sk), 719 NETLINK_CB(cb->skb).portid, 720 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 721 } 722 723 static void twsk_build_assert(void) 724 { 725 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) != 726 offsetof(struct sock, sk_family)); 727 728 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) != 729 offsetof(struct inet_sock, inet_num)); 730 731 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) != 732 offsetof(struct inet_sock, inet_dport)); 733 734 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) != 735 offsetof(struct inet_sock, inet_rcv_saddr)); 736 737 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) != 738 offsetof(struct inet_sock, inet_daddr)); 739 740 #if IS_ENABLED(CONFIG_IPV6) 741 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) != 742 offsetof(struct sock, sk_v6_rcv_saddr)); 743 744 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) != 745 offsetof(struct sock, sk_v6_daddr)); 746 #endif 747 } 748 749 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb, 750 struct netlink_callback *cb, 751 const struct inet_diag_req_v2 *r, struct nlattr *bc) 752 { 753 struct net *net = sock_net(skb->sk); 754 int i, num, s_i, s_num; 755 u32 idiag_states = r->idiag_states; 756 757 if (idiag_states & TCPF_SYN_RECV) 758 idiag_states |= TCPF_NEW_SYN_RECV; 759 s_i = cb->args[1]; 760 s_num = num = cb->args[2]; 761 762 if (cb->args[0] == 0) { 763 if (!(idiag_states & TCPF_LISTEN)) 764 goto skip_listen_ht; 765 766 for (i = s_i; i < INET_LHTABLE_SIZE; i++) { 767 struct inet_listen_hashbucket *ilb; 768 struct hlist_nulls_node *node; 769 struct sock *sk; 770 771 num = 0; 772 ilb = &hashinfo->listening_hash[i]; 773 spin_lock_bh(&ilb->lock); 774 sk_nulls_for_each(sk, node, &ilb->head) { 775 struct inet_sock *inet = inet_sk(sk); 776 777 if (!net_eq(sock_net(sk), net)) 778 continue; 779 780 if (num < s_num) { 781 num++; 782 continue; 783 } 784 785 if (r->sdiag_family != AF_UNSPEC && 786 sk->sk_family != r->sdiag_family) 787 goto next_listen; 788 789 if (r->id.idiag_sport != inet->inet_sport && 790 r->id.idiag_sport) 791 goto next_listen; 792 793 if (r->id.idiag_dport || 794 cb->args[3] > 0) 795 goto next_listen; 796 797 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) { 798 spin_unlock_bh(&ilb->lock); 799 goto done; 800 } 801 802 next_listen: 803 cb->args[3] = 0; 804 cb->args[4] = 0; 805 ++num; 806 } 807 spin_unlock_bh(&ilb->lock); 808 809 s_num = 0; 810 cb->args[3] = 0; 811 cb->args[4] = 0; 812 } 813 skip_listen_ht: 814 cb->args[0] = 1; 815 s_i = num = s_num = 0; 816 } 817 818 if (!(idiag_states & ~TCPF_LISTEN)) 819 goto out; 820 821 for (i = s_i; i <= hashinfo->ehash_mask; i++) { 822 struct inet_ehash_bucket *head = &hashinfo->ehash[i]; 823 spinlock_t *lock = inet_ehash_lockp(hashinfo, i); 824 struct hlist_nulls_node *node; 825 struct sock *sk; 826 827 num = 0; 828 829 if (hlist_nulls_empty(&head->chain)) 830 continue; 831 832 if (i > s_i) 833 s_num = 0; 834 835 spin_lock_bh(lock); 836 sk_nulls_for_each(sk, node, &head->chain) { 837 int state, res; 838 839 if (!net_eq(sock_net(sk), net)) 840 continue; 841 if (num < s_num) 842 goto next_normal; 843 state = (sk->sk_state == TCP_TIME_WAIT) ? 844 inet_twsk(sk)->tw_substate : sk->sk_state; 845 if (!(idiag_states & (1 << state))) 846 goto next_normal; 847 if (r->sdiag_family != AF_UNSPEC && 848 sk->sk_family != r->sdiag_family) 849 goto next_normal; 850 if (r->id.idiag_sport != htons(sk->sk_num) && 851 r->id.idiag_sport) 852 goto next_normal; 853 if (r->id.idiag_dport != sk->sk_dport && 854 r->id.idiag_dport) 855 goto next_normal; 856 twsk_build_assert(); 857 858 if (!inet_diag_bc_sk(bc, sk)) 859 goto next_normal; 860 861 res = sk_diag_fill(sk, skb, r, 862 sk_user_ns(NETLINK_CB(cb->skb).sk), 863 NETLINK_CB(cb->skb).portid, 864 cb->nlh->nlmsg_seq, NLM_F_MULTI, 865 cb->nlh); 866 if (res < 0) { 867 spin_unlock_bh(lock); 868 goto done; 869 } 870 next_normal: 871 ++num; 872 } 873 874 spin_unlock_bh(lock); 875 } 876 877 done: 878 cb->args[1] = i; 879 cb->args[2] = num; 880 out: 881 ; 882 } 883 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk); 884 885 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, 886 const struct inet_diag_req_v2 *r, 887 struct nlattr *bc) 888 { 889 const struct inet_diag_handler *handler; 890 int err = 0; 891 892 handler = inet_diag_lock_handler(r->sdiag_protocol); 893 if (!IS_ERR(handler)) 894 handler->dump(skb, cb, r, bc); 895 else 896 err = PTR_ERR(handler); 897 inet_diag_unlock_handler(handler); 898 899 return err ? : skb->len; 900 } 901 902 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) 903 { 904 int hdrlen = sizeof(struct inet_diag_req_v2); 905 struct nlattr *bc = NULL; 906 907 if (nlmsg_attrlen(cb->nlh, hdrlen)) 908 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); 909 910 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc); 911 } 912 913 static int inet_diag_type2proto(int type) 914 { 915 switch (type) { 916 case TCPDIAG_GETSOCK: 917 return IPPROTO_TCP; 918 case DCCPDIAG_GETSOCK: 919 return IPPROTO_DCCP; 920 default: 921 return 0; 922 } 923 } 924 925 static int inet_diag_dump_compat(struct sk_buff *skb, 926 struct netlink_callback *cb) 927 { 928 struct inet_diag_req *rc = nlmsg_data(cb->nlh); 929 int hdrlen = sizeof(struct inet_diag_req); 930 struct inet_diag_req_v2 req; 931 struct nlattr *bc = NULL; 932 933 req.sdiag_family = AF_UNSPEC; /* compatibility */ 934 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type); 935 req.idiag_ext = rc->idiag_ext; 936 req.idiag_states = rc->idiag_states; 937 req.id = rc->id; 938 939 if (nlmsg_attrlen(cb->nlh, hdrlen)) 940 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); 941 942 return __inet_diag_dump(skb, cb, &req, bc); 943 } 944 945 static int inet_diag_get_exact_compat(struct sk_buff *in_skb, 946 const struct nlmsghdr *nlh) 947 { 948 struct inet_diag_req *rc = nlmsg_data(nlh); 949 struct inet_diag_req_v2 req; 950 951 req.sdiag_family = rc->idiag_family; 952 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type); 953 req.idiag_ext = rc->idiag_ext; 954 req.idiag_states = rc->idiag_states; 955 req.id = rc->id; 956 957 return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req); 958 } 959 960 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh) 961 { 962 int hdrlen = sizeof(struct inet_diag_req); 963 struct net *net = sock_net(skb->sk); 964 965 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX || 966 nlmsg_len(nlh) < hdrlen) 967 return -EINVAL; 968 969 if (nlh->nlmsg_flags & NLM_F_DUMP) { 970 if (nlmsg_attrlen(nlh, hdrlen)) { 971 struct nlattr *attr; 972 973 attr = nlmsg_find_attr(nlh, hdrlen, 974 INET_DIAG_REQ_BYTECODE); 975 if (!attr || 976 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 977 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 978 return -EINVAL; 979 } 980 { 981 struct netlink_dump_control c = { 982 .dump = inet_diag_dump_compat, 983 }; 984 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c); 985 } 986 } 987 988 return inet_diag_get_exact_compat(skb, nlh); 989 } 990 991 static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h) 992 { 993 int hdrlen = sizeof(struct inet_diag_req_v2); 994 struct net *net = sock_net(skb->sk); 995 996 if (nlmsg_len(h) < hdrlen) 997 return -EINVAL; 998 999 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY && 1000 h->nlmsg_flags & NLM_F_DUMP) { 1001 if (nlmsg_attrlen(h, hdrlen)) { 1002 struct nlattr *attr; 1003 1004 attr = nlmsg_find_attr(h, hdrlen, 1005 INET_DIAG_REQ_BYTECODE); 1006 if (!attr || 1007 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 1008 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 1009 return -EINVAL; 1010 } 1011 { 1012 struct netlink_dump_control c = { 1013 .dump = inet_diag_dump, 1014 }; 1015 return netlink_dump_start(net->diag_nlsk, skb, h, &c); 1016 } 1017 } 1018 1019 return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h)); 1020 } 1021 1022 static 1023 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk) 1024 { 1025 const struct inet_diag_handler *handler; 1026 struct nlmsghdr *nlh; 1027 struct nlattr *attr; 1028 struct inet_diag_msg *r; 1029 void *info = NULL; 1030 int err = 0; 1031 1032 nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0); 1033 if (!nlh) 1034 return -ENOMEM; 1035 1036 r = nlmsg_data(nlh); 1037 memset(r, 0, sizeof(*r)); 1038 inet_diag_msg_common_fill(r, sk); 1039 if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM) 1040 r->id.idiag_sport = inet_sk(sk)->inet_sport; 1041 r->idiag_state = sk->sk_state; 1042 1043 if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) { 1044 nlmsg_cancel(skb, nlh); 1045 return err; 1046 } 1047 1048 handler = inet_diag_lock_handler(sk->sk_protocol); 1049 if (IS_ERR(handler)) { 1050 inet_diag_unlock_handler(handler); 1051 nlmsg_cancel(skb, nlh); 1052 return PTR_ERR(handler); 1053 } 1054 1055 attr = handler->idiag_info_size 1056 ? nla_reserve(skb, INET_DIAG_INFO, handler->idiag_info_size) 1057 : NULL; 1058 if (attr) 1059 info = nla_data(attr); 1060 1061 handler->idiag_get_info(sk, r, info); 1062 inet_diag_unlock_handler(handler); 1063 1064 nlmsg_end(skb, nlh); 1065 return 0; 1066 } 1067 1068 static const struct sock_diag_handler inet_diag_handler = { 1069 .family = AF_INET, 1070 .dump = inet_diag_handler_cmd, 1071 .get_info = inet_diag_handler_get_info, 1072 .destroy = inet_diag_handler_cmd, 1073 }; 1074 1075 static const struct sock_diag_handler inet6_diag_handler = { 1076 .family = AF_INET6, 1077 .dump = inet_diag_handler_cmd, 1078 .get_info = inet_diag_handler_get_info, 1079 .destroy = inet_diag_handler_cmd, 1080 }; 1081 1082 int inet_diag_register(const struct inet_diag_handler *h) 1083 { 1084 const __u16 type = h->idiag_type; 1085 int err = -EINVAL; 1086 1087 if (type >= IPPROTO_MAX) 1088 goto out; 1089 1090 mutex_lock(&inet_diag_table_mutex); 1091 err = -EEXIST; 1092 if (!inet_diag_table[type]) { 1093 inet_diag_table[type] = h; 1094 err = 0; 1095 } 1096 mutex_unlock(&inet_diag_table_mutex); 1097 out: 1098 return err; 1099 } 1100 EXPORT_SYMBOL_GPL(inet_diag_register); 1101 1102 void inet_diag_unregister(const struct inet_diag_handler *h) 1103 { 1104 const __u16 type = h->idiag_type; 1105 1106 if (type >= IPPROTO_MAX) 1107 return; 1108 1109 mutex_lock(&inet_diag_table_mutex); 1110 inet_diag_table[type] = NULL; 1111 mutex_unlock(&inet_diag_table_mutex); 1112 } 1113 EXPORT_SYMBOL_GPL(inet_diag_unregister); 1114 1115 static int __init inet_diag_init(void) 1116 { 1117 const int inet_diag_table_size = (IPPROTO_MAX * 1118 sizeof(struct inet_diag_handler *)); 1119 int err = -ENOMEM; 1120 1121 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL); 1122 if (!inet_diag_table) 1123 goto out; 1124 1125 err = sock_diag_register(&inet_diag_handler); 1126 if (err) 1127 goto out_free_nl; 1128 1129 err = sock_diag_register(&inet6_diag_handler); 1130 if (err) 1131 goto out_free_inet; 1132 1133 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat); 1134 out: 1135 return err; 1136 1137 out_free_inet: 1138 sock_diag_unregister(&inet_diag_handler); 1139 out_free_nl: 1140 kfree(inet_diag_table); 1141 goto out; 1142 } 1143 1144 static void __exit inet_diag_exit(void) 1145 { 1146 sock_diag_unregister(&inet6_diag_handler); 1147 sock_diag_unregister(&inet_diag_handler); 1148 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat); 1149 kfree(inet_diag_table); 1150 } 1151 1152 module_init(inet_diag_init); 1153 module_exit(inet_diag_exit); 1154 MODULE_LICENSE("GPL"); 1155 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */); 1156 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */); 1157