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 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 EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill); 93 94 static size_t inet_sk_attr_size(void) 95 { 96 return nla_total_size(sizeof(struct tcp_info)) 97 + nla_total_size(1) /* INET_DIAG_SHUTDOWN */ 98 + nla_total_size(1) /* INET_DIAG_TOS */ 99 + nla_total_size(1) /* INET_DIAG_TCLASS */ 100 + nla_total_size(sizeof(struct inet_diag_meminfo)) 101 + nla_total_size(sizeof(struct inet_diag_msg)) 102 + nla_total_size(SK_MEMINFO_VARS * sizeof(u32)) 103 + nla_total_size(TCP_CA_NAME_MAX) 104 + nla_total_size(sizeof(struct tcpvegas_info)) 105 + 64; 106 } 107 108 int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb, 109 struct inet_diag_msg *r, int ext, 110 struct user_namespace *user_ns) 111 { 112 const struct inet_sock *inet = inet_sk(sk); 113 114 if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown)) 115 goto errout; 116 117 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections, 118 * hence this needs to be included regardless of socket family. 119 */ 120 if (ext & (1 << (INET_DIAG_TOS - 1))) 121 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0) 122 goto errout; 123 124 #if IS_ENABLED(CONFIG_IPV6) 125 if (r->idiag_family == AF_INET6) { 126 if (ext & (1 << (INET_DIAG_TCLASS - 1))) 127 if (nla_put_u8(skb, INET_DIAG_TCLASS, 128 inet6_sk(sk)->tclass) < 0) 129 goto errout; 130 131 if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) && 132 nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk))) 133 goto errout; 134 } 135 #endif 136 137 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk)); 138 r->idiag_inode = sock_i_ino(sk); 139 140 return 0; 141 errout: 142 return 1; 143 } 144 EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill); 145 146 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk, 147 struct sk_buff *skb, const struct inet_diag_req_v2 *req, 148 struct user_namespace *user_ns, 149 u32 portid, u32 seq, u16 nlmsg_flags, 150 const struct nlmsghdr *unlh) 151 { 152 const struct tcp_congestion_ops *ca_ops; 153 const struct inet_diag_handler *handler; 154 int ext = req->idiag_ext; 155 struct inet_diag_msg *r; 156 struct nlmsghdr *nlh; 157 struct nlattr *attr; 158 void *info = NULL; 159 160 handler = inet_diag_table[req->sdiag_protocol]; 161 BUG_ON(!handler); 162 163 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r), 164 nlmsg_flags); 165 if (!nlh) 166 return -EMSGSIZE; 167 168 r = nlmsg_data(nlh); 169 BUG_ON(!sk_fullsock(sk)); 170 171 inet_diag_msg_common_fill(r, sk); 172 r->idiag_state = sk->sk_state; 173 r->idiag_timer = 0; 174 r->idiag_retrans = 0; 175 176 if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns)) 177 goto errout; 178 179 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) { 180 struct inet_diag_meminfo minfo = { 181 .idiag_rmem = sk_rmem_alloc_get(sk), 182 .idiag_wmem = sk->sk_wmem_queued, 183 .idiag_fmem = sk->sk_forward_alloc, 184 .idiag_tmem = sk_wmem_alloc_get(sk), 185 }; 186 187 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0) 188 goto errout; 189 } 190 191 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1))) 192 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO)) 193 goto errout; 194 195 if (!icsk) { 196 handler->idiag_get_info(sk, r, NULL); 197 goto out; 198 } 199 200 if (icsk->icsk_pending == ICSK_TIME_RETRANS || 201 icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS || 202 icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) { 203 r->idiag_timer = 1; 204 r->idiag_retrans = icsk->icsk_retransmits; 205 r->idiag_expires = 206 jiffies_to_msecs(icsk->icsk_timeout - jiffies); 207 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { 208 r->idiag_timer = 4; 209 r->idiag_retrans = icsk->icsk_probes_out; 210 r->idiag_expires = 211 jiffies_to_msecs(icsk->icsk_timeout - jiffies); 212 } else if (timer_pending(&sk->sk_timer)) { 213 r->idiag_timer = 2; 214 r->idiag_retrans = icsk->icsk_probes_out; 215 r->idiag_expires = 216 jiffies_to_msecs(sk->sk_timer.expires - jiffies); 217 } else { 218 r->idiag_timer = 0; 219 r->idiag_expires = 0; 220 } 221 222 if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) { 223 attr = nla_reserve_64bit(skb, INET_DIAG_INFO, 224 handler->idiag_info_size, 225 INET_DIAG_PAD); 226 if (!attr) 227 goto errout; 228 229 info = nla_data(attr); 230 } 231 232 if (ext & (1 << (INET_DIAG_CONG - 1))) { 233 int err = 0; 234 235 rcu_read_lock(); 236 ca_ops = READ_ONCE(icsk->icsk_ca_ops); 237 if (ca_ops) 238 err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name); 239 rcu_read_unlock(); 240 if (err < 0) 241 goto errout; 242 } 243 244 handler->idiag_get_info(sk, r, info); 245 246 if (sk->sk_state < TCP_TIME_WAIT) { 247 union tcp_cc_info info; 248 size_t sz = 0; 249 int attr; 250 251 rcu_read_lock(); 252 ca_ops = READ_ONCE(icsk->icsk_ca_ops); 253 if (ca_ops && ca_ops->get_info) 254 sz = ca_ops->get_info(sk, ext, &attr, &info); 255 rcu_read_unlock(); 256 if (sz && nla_put(skb, attr, sz, &info) < 0) 257 goto errout; 258 } 259 260 out: 261 nlmsg_end(skb, nlh); 262 return 0; 263 264 errout: 265 nlmsg_cancel(skb, nlh); 266 return -EMSGSIZE; 267 } 268 EXPORT_SYMBOL_GPL(inet_sk_diag_fill); 269 270 static int inet_csk_diag_fill(struct sock *sk, 271 struct sk_buff *skb, 272 const struct inet_diag_req_v2 *req, 273 struct user_namespace *user_ns, 274 u32 portid, u32 seq, u16 nlmsg_flags, 275 const struct nlmsghdr *unlh) 276 { 277 return inet_sk_diag_fill(sk, inet_csk(sk), skb, req, 278 user_ns, portid, seq, nlmsg_flags, unlh); 279 } 280 281 static int inet_twsk_diag_fill(struct sock *sk, 282 struct sk_buff *skb, 283 u32 portid, u32 seq, u16 nlmsg_flags, 284 const struct nlmsghdr *unlh) 285 { 286 struct inet_timewait_sock *tw = inet_twsk(sk); 287 struct inet_diag_msg *r; 288 struct nlmsghdr *nlh; 289 long tmo; 290 291 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r), 292 nlmsg_flags); 293 if (!nlh) 294 return -EMSGSIZE; 295 296 r = nlmsg_data(nlh); 297 BUG_ON(tw->tw_state != TCP_TIME_WAIT); 298 299 tmo = tw->tw_timer.expires - jiffies; 300 if (tmo < 0) 301 tmo = 0; 302 303 inet_diag_msg_common_fill(r, sk); 304 r->idiag_retrans = 0; 305 306 r->idiag_state = tw->tw_substate; 307 r->idiag_timer = 3; 308 r->idiag_expires = jiffies_to_msecs(tmo); 309 r->idiag_rqueue = 0; 310 r->idiag_wqueue = 0; 311 r->idiag_uid = 0; 312 r->idiag_inode = 0; 313 314 nlmsg_end(skb, nlh); 315 return 0; 316 } 317 318 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb, 319 u32 portid, u32 seq, u16 nlmsg_flags, 320 const struct nlmsghdr *unlh) 321 { 322 struct inet_diag_msg *r; 323 struct nlmsghdr *nlh; 324 long tmo; 325 326 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r), 327 nlmsg_flags); 328 if (!nlh) 329 return -EMSGSIZE; 330 331 r = nlmsg_data(nlh); 332 inet_diag_msg_common_fill(r, sk); 333 r->idiag_state = TCP_SYN_RECV; 334 r->idiag_timer = 1; 335 r->idiag_retrans = inet_reqsk(sk)->num_retrans; 336 337 BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) != 338 offsetof(struct sock, sk_cookie)); 339 340 tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies; 341 r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0; 342 r->idiag_rqueue = 0; 343 r->idiag_wqueue = 0; 344 r->idiag_uid = 0; 345 r->idiag_inode = 0; 346 347 nlmsg_end(skb, nlh); 348 return 0; 349 } 350 351 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, 352 const struct inet_diag_req_v2 *r, 353 struct user_namespace *user_ns, 354 u32 portid, u32 seq, u16 nlmsg_flags, 355 const struct nlmsghdr *unlh) 356 { 357 if (sk->sk_state == TCP_TIME_WAIT) 358 return inet_twsk_diag_fill(sk, skb, portid, seq, 359 nlmsg_flags, unlh); 360 361 if (sk->sk_state == TCP_NEW_SYN_RECV) 362 return inet_req_diag_fill(sk, skb, portid, seq, 363 nlmsg_flags, unlh); 364 365 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq, 366 nlmsg_flags, unlh); 367 } 368 369 struct sock *inet_diag_find_one_icsk(struct net *net, 370 struct inet_hashinfo *hashinfo, 371 const struct inet_diag_req_v2 *req) 372 { 373 struct sock *sk; 374 375 rcu_read_lock(); 376 if (req->sdiag_family == AF_INET) 377 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0], 378 req->id.idiag_dport, req->id.idiag_src[0], 379 req->id.idiag_sport, req->id.idiag_if); 380 #if IS_ENABLED(CONFIG_IPV6) 381 else if (req->sdiag_family == AF_INET6) { 382 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) && 383 ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src)) 384 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3], 385 req->id.idiag_dport, req->id.idiag_src[3], 386 req->id.idiag_sport, req->id.idiag_if); 387 else 388 sk = inet6_lookup(net, hashinfo, NULL, 0, 389 (struct in6_addr *)req->id.idiag_dst, 390 req->id.idiag_dport, 391 (struct in6_addr *)req->id.idiag_src, 392 req->id.idiag_sport, 393 req->id.idiag_if); 394 } 395 #endif 396 else { 397 rcu_read_unlock(); 398 return ERR_PTR(-EINVAL); 399 } 400 rcu_read_unlock(); 401 if (!sk) 402 return ERR_PTR(-ENOENT); 403 404 if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) { 405 sock_gen_put(sk); 406 return ERR_PTR(-ENOENT); 407 } 408 409 return sk; 410 } 411 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk); 412 413 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, 414 struct sk_buff *in_skb, 415 const struct nlmsghdr *nlh, 416 const struct inet_diag_req_v2 *req) 417 { 418 struct net *net = sock_net(in_skb->sk); 419 struct sk_buff *rep; 420 struct sock *sk; 421 int err; 422 423 sk = inet_diag_find_one_icsk(net, hashinfo, req); 424 if (IS_ERR(sk)) 425 return PTR_ERR(sk); 426 427 rep = nlmsg_new(inet_sk_attr_size(), GFP_KERNEL); 428 if (!rep) { 429 err = -ENOMEM; 430 goto out; 431 } 432 433 err = sk_diag_fill(sk, rep, req, 434 sk_user_ns(NETLINK_CB(in_skb).sk), 435 NETLINK_CB(in_skb).portid, 436 nlh->nlmsg_seq, 0, nlh); 437 if (err < 0) { 438 WARN_ON(err == -EMSGSIZE); 439 nlmsg_free(rep); 440 goto out; 441 } 442 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid, 443 MSG_DONTWAIT); 444 if (err > 0) 445 err = 0; 446 447 out: 448 if (sk) 449 sock_gen_put(sk); 450 451 return err; 452 } 453 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk); 454 455 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb, 456 const struct nlmsghdr *nlh, 457 const struct inet_diag_req_v2 *req) 458 { 459 const struct inet_diag_handler *handler; 460 int err; 461 462 handler = inet_diag_lock_handler(req->sdiag_protocol); 463 if (IS_ERR(handler)) 464 err = PTR_ERR(handler); 465 else if (cmd == SOCK_DIAG_BY_FAMILY) 466 err = handler->dump_one(in_skb, nlh, req); 467 else if (cmd == SOCK_DESTROY && handler->destroy) 468 err = handler->destroy(in_skb, req); 469 else 470 err = -EOPNOTSUPP; 471 inet_diag_unlock_handler(handler); 472 473 return err; 474 } 475 476 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits) 477 { 478 int words = bits >> 5; 479 480 bits &= 0x1f; 481 482 if (words) { 483 if (memcmp(a1, a2, words << 2)) 484 return 0; 485 } 486 if (bits) { 487 __be32 w1, w2; 488 __be32 mask; 489 490 w1 = a1[words]; 491 w2 = a2[words]; 492 493 mask = htonl((0xffffffff) << (32 - bits)); 494 495 if ((w1 ^ w2) & mask) 496 return 0; 497 } 498 499 return 1; 500 } 501 502 static int inet_diag_bc_run(const struct nlattr *_bc, 503 const struct inet_diag_entry *entry) 504 { 505 const void *bc = nla_data(_bc); 506 int len = nla_len(_bc); 507 508 while (len > 0) { 509 int yes = 1; 510 const struct inet_diag_bc_op *op = bc; 511 512 switch (op->code) { 513 case INET_DIAG_BC_NOP: 514 break; 515 case INET_DIAG_BC_JMP: 516 yes = 0; 517 break; 518 case INET_DIAG_BC_S_GE: 519 yes = entry->sport >= op[1].no; 520 break; 521 case INET_DIAG_BC_S_LE: 522 yes = entry->sport <= op[1].no; 523 break; 524 case INET_DIAG_BC_D_GE: 525 yes = entry->dport >= op[1].no; 526 break; 527 case INET_DIAG_BC_D_LE: 528 yes = entry->dport <= op[1].no; 529 break; 530 case INET_DIAG_BC_AUTO: 531 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); 532 break; 533 case INET_DIAG_BC_S_COND: 534 case INET_DIAG_BC_D_COND: { 535 const struct inet_diag_hostcond *cond; 536 const __be32 *addr; 537 538 cond = (const struct inet_diag_hostcond *)(op + 1); 539 if (cond->port != -1 && 540 cond->port != (op->code == INET_DIAG_BC_S_COND ? 541 entry->sport : entry->dport)) { 542 yes = 0; 543 break; 544 } 545 546 if (op->code == INET_DIAG_BC_S_COND) 547 addr = entry->saddr; 548 else 549 addr = entry->daddr; 550 551 if (cond->family != AF_UNSPEC && 552 cond->family != entry->family) { 553 if (entry->family == AF_INET6 && 554 cond->family == AF_INET) { 555 if (addr[0] == 0 && addr[1] == 0 && 556 addr[2] == htonl(0xffff) && 557 bitstring_match(addr + 3, 558 cond->addr, 559 cond->prefix_len)) 560 break; 561 } 562 yes = 0; 563 break; 564 } 565 566 if (cond->prefix_len == 0) 567 break; 568 if (bitstring_match(addr, cond->addr, 569 cond->prefix_len)) 570 break; 571 yes = 0; 572 break; 573 } 574 } 575 576 if (yes) { 577 len -= op->yes; 578 bc += op->yes; 579 } else { 580 len -= op->no; 581 bc += op->no; 582 } 583 } 584 return len == 0; 585 } 586 587 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV) 588 */ 589 static void entry_fill_addrs(struct inet_diag_entry *entry, 590 const struct sock *sk) 591 { 592 #if IS_ENABLED(CONFIG_IPV6) 593 if (sk->sk_family == AF_INET6) { 594 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32; 595 entry->daddr = sk->sk_v6_daddr.s6_addr32; 596 } else 597 #endif 598 { 599 entry->saddr = &sk->sk_rcv_saddr; 600 entry->daddr = &sk->sk_daddr; 601 } 602 } 603 604 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk) 605 { 606 struct inet_sock *inet = inet_sk(sk); 607 struct inet_diag_entry entry; 608 609 if (!bc) 610 return 1; 611 612 entry.family = sk->sk_family; 613 entry_fill_addrs(&entry, sk); 614 entry.sport = inet->inet_num; 615 entry.dport = ntohs(inet->inet_dport); 616 entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0; 617 618 return inet_diag_bc_run(bc, &entry); 619 } 620 EXPORT_SYMBOL_GPL(inet_diag_bc_sk); 621 622 static int valid_cc(const void *bc, int len, int cc) 623 { 624 while (len >= 0) { 625 const struct inet_diag_bc_op *op = bc; 626 627 if (cc > len) 628 return 0; 629 if (cc == len) 630 return 1; 631 if (op->yes < 4 || op->yes & 3) 632 return 0; 633 len -= op->yes; 634 bc += op->yes; 635 } 636 return 0; 637 } 638 639 /* Validate an inet_diag_hostcond. */ 640 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len, 641 int *min_len) 642 { 643 struct inet_diag_hostcond *cond; 644 int addr_len; 645 646 /* Check hostcond space. */ 647 *min_len += sizeof(struct inet_diag_hostcond); 648 if (len < *min_len) 649 return false; 650 cond = (struct inet_diag_hostcond *)(op + 1); 651 652 /* Check address family and address length. */ 653 switch (cond->family) { 654 case AF_UNSPEC: 655 addr_len = 0; 656 break; 657 case AF_INET: 658 addr_len = sizeof(struct in_addr); 659 break; 660 case AF_INET6: 661 addr_len = sizeof(struct in6_addr); 662 break; 663 default: 664 return false; 665 } 666 *min_len += addr_len; 667 if (len < *min_len) 668 return false; 669 670 /* Check prefix length (in bits) vs address length (in bytes). */ 671 if (cond->prefix_len > 8 * addr_len) 672 return false; 673 674 return true; 675 } 676 677 /* Validate a port comparison operator. */ 678 static bool valid_port_comparison(const struct inet_diag_bc_op *op, 679 int len, int *min_len) 680 { 681 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */ 682 *min_len += sizeof(struct inet_diag_bc_op); 683 if (len < *min_len) 684 return false; 685 return true; 686 } 687 688 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len) 689 { 690 const void *bc = bytecode; 691 int len = bytecode_len; 692 693 while (len > 0) { 694 int min_len = sizeof(struct inet_diag_bc_op); 695 const struct inet_diag_bc_op *op = bc; 696 697 switch (op->code) { 698 case INET_DIAG_BC_S_COND: 699 case INET_DIAG_BC_D_COND: 700 if (!valid_hostcond(bc, len, &min_len)) 701 return -EINVAL; 702 break; 703 case INET_DIAG_BC_S_GE: 704 case INET_DIAG_BC_S_LE: 705 case INET_DIAG_BC_D_GE: 706 case INET_DIAG_BC_D_LE: 707 if (!valid_port_comparison(bc, len, &min_len)) 708 return -EINVAL; 709 break; 710 case INET_DIAG_BC_AUTO: 711 case INET_DIAG_BC_JMP: 712 case INET_DIAG_BC_NOP: 713 break; 714 default: 715 return -EINVAL; 716 } 717 718 if (op->code != INET_DIAG_BC_NOP) { 719 if (op->no < min_len || op->no > len + 4 || op->no & 3) 720 return -EINVAL; 721 if (op->no < len && 722 !valid_cc(bytecode, bytecode_len, len - op->no)) 723 return -EINVAL; 724 } 725 726 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3) 727 return -EINVAL; 728 bc += op->yes; 729 len -= op->yes; 730 } 731 return len == 0 ? 0 : -EINVAL; 732 } 733 734 static int inet_csk_diag_dump(struct sock *sk, 735 struct sk_buff *skb, 736 struct netlink_callback *cb, 737 const struct inet_diag_req_v2 *r, 738 const struct nlattr *bc) 739 { 740 if (!inet_diag_bc_sk(bc, sk)) 741 return 0; 742 743 return inet_csk_diag_fill(sk, skb, r, 744 sk_user_ns(NETLINK_CB(cb->skb).sk), 745 NETLINK_CB(cb->skb).portid, 746 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 747 } 748 749 static void twsk_build_assert(void) 750 { 751 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) != 752 offsetof(struct sock, sk_family)); 753 754 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) != 755 offsetof(struct inet_sock, inet_num)); 756 757 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) != 758 offsetof(struct inet_sock, inet_dport)); 759 760 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) != 761 offsetof(struct inet_sock, inet_rcv_saddr)); 762 763 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) != 764 offsetof(struct inet_sock, inet_daddr)); 765 766 #if IS_ENABLED(CONFIG_IPV6) 767 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) != 768 offsetof(struct sock, sk_v6_rcv_saddr)); 769 770 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) != 771 offsetof(struct sock, sk_v6_daddr)); 772 #endif 773 } 774 775 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb, 776 struct netlink_callback *cb, 777 const struct inet_diag_req_v2 *r, struct nlattr *bc) 778 { 779 struct net *net = sock_net(skb->sk); 780 int i, num, s_i, s_num; 781 u32 idiag_states = r->idiag_states; 782 783 if (idiag_states & TCPF_SYN_RECV) 784 idiag_states |= TCPF_NEW_SYN_RECV; 785 s_i = cb->args[1]; 786 s_num = num = cb->args[2]; 787 788 if (cb->args[0] == 0) { 789 if (!(idiag_states & TCPF_LISTEN)) 790 goto skip_listen_ht; 791 792 for (i = s_i; i < INET_LHTABLE_SIZE; i++) { 793 struct inet_listen_hashbucket *ilb; 794 struct sock *sk; 795 796 num = 0; 797 ilb = &hashinfo->listening_hash[i]; 798 spin_lock_bh(&ilb->lock); 799 sk_for_each(sk, &ilb->head) { 800 struct inet_sock *inet = inet_sk(sk); 801 802 if (!net_eq(sock_net(sk), net)) 803 continue; 804 805 if (num < s_num) { 806 num++; 807 continue; 808 } 809 810 if (r->sdiag_family != AF_UNSPEC && 811 sk->sk_family != r->sdiag_family) 812 goto next_listen; 813 814 if (r->id.idiag_sport != inet->inet_sport && 815 r->id.idiag_sport) 816 goto next_listen; 817 818 if (r->id.idiag_dport || 819 cb->args[3] > 0) 820 goto next_listen; 821 822 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) { 823 spin_unlock_bh(&ilb->lock); 824 goto done; 825 } 826 827 next_listen: 828 cb->args[3] = 0; 829 cb->args[4] = 0; 830 ++num; 831 } 832 spin_unlock_bh(&ilb->lock); 833 834 s_num = 0; 835 cb->args[3] = 0; 836 cb->args[4] = 0; 837 } 838 skip_listen_ht: 839 cb->args[0] = 1; 840 s_i = num = s_num = 0; 841 } 842 843 if (!(idiag_states & ~TCPF_LISTEN)) 844 goto out; 845 846 for (i = s_i; i <= hashinfo->ehash_mask; i++) { 847 struct inet_ehash_bucket *head = &hashinfo->ehash[i]; 848 spinlock_t *lock = inet_ehash_lockp(hashinfo, i); 849 struct hlist_nulls_node *node; 850 struct sock *sk; 851 852 num = 0; 853 854 if (hlist_nulls_empty(&head->chain)) 855 continue; 856 857 if (i > s_i) 858 s_num = 0; 859 860 spin_lock_bh(lock); 861 sk_nulls_for_each(sk, node, &head->chain) { 862 int state, res; 863 864 if (!net_eq(sock_net(sk), net)) 865 continue; 866 if (num < s_num) 867 goto next_normal; 868 state = (sk->sk_state == TCP_TIME_WAIT) ? 869 inet_twsk(sk)->tw_substate : sk->sk_state; 870 if (!(idiag_states & (1 << state))) 871 goto next_normal; 872 if (r->sdiag_family != AF_UNSPEC && 873 sk->sk_family != r->sdiag_family) 874 goto next_normal; 875 if (r->id.idiag_sport != htons(sk->sk_num) && 876 r->id.idiag_sport) 877 goto next_normal; 878 if (r->id.idiag_dport != sk->sk_dport && 879 r->id.idiag_dport) 880 goto next_normal; 881 twsk_build_assert(); 882 883 if (!inet_diag_bc_sk(bc, sk)) 884 goto next_normal; 885 886 res = sk_diag_fill(sk, skb, r, 887 sk_user_ns(NETLINK_CB(cb->skb).sk), 888 NETLINK_CB(cb->skb).portid, 889 cb->nlh->nlmsg_seq, NLM_F_MULTI, 890 cb->nlh); 891 if (res < 0) { 892 spin_unlock_bh(lock); 893 goto done; 894 } 895 next_normal: 896 ++num; 897 } 898 899 spin_unlock_bh(lock); 900 cond_resched(); 901 } 902 903 done: 904 cb->args[1] = i; 905 cb->args[2] = num; 906 out: 907 ; 908 } 909 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk); 910 911 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, 912 const struct inet_diag_req_v2 *r, 913 struct nlattr *bc) 914 { 915 const struct inet_diag_handler *handler; 916 int err = 0; 917 918 handler = inet_diag_lock_handler(r->sdiag_protocol); 919 if (!IS_ERR(handler)) 920 handler->dump(skb, cb, r, bc); 921 else 922 err = PTR_ERR(handler); 923 inet_diag_unlock_handler(handler); 924 925 return err ? : skb->len; 926 } 927 928 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) 929 { 930 int hdrlen = sizeof(struct inet_diag_req_v2); 931 struct nlattr *bc = NULL; 932 933 if (nlmsg_attrlen(cb->nlh, hdrlen)) 934 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); 935 936 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc); 937 } 938 939 static int inet_diag_type2proto(int type) 940 { 941 switch (type) { 942 case TCPDIAG_GETSOCK: 943 return IPPROTO_TCP; 944 case DCCPDIAG_GETSOCK: 945 return IPPROTO_DCCP; 946 default: 947 return 0; 948 } 949 } 950 951 static int inet_diag_dump_compat(struct sk_buff *skb, 952 struct netlink_callback *cb) 953 { 954 struct inet_diag_req *rc = nlmsg_data(cb->nlh); 955 int hdrlen = sizeof(struct inet_diag_req); 956 struct inet_diag_req_v2 req; 957 struct nlattr *bc = NULL; 958 959 req.sdiag_family = AF_UNSPEC; /* compatibility */ 960 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type); 961 req.idiag_ext = rc->idiag_ext; 962 req.idiag_states = rc->idiag_states; 963 req.id = rc->id; 964 965 if (nlmsg_attrlen(cb->nlh, hdrlen)) 966 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); 967 968 return __inet_diag_dump(skb, cb, &req, bc); 969 } 970 971 static int inet_diag_get_exact_compat(struct sk_buff *in_skb, 972 const struct nlmsghdr *nlh) 973 { 974 struct inet_diag_req *rc = nlmsg_data(nlh); 975 struct inet_diag_req_v2 req; 976 977 req.sdiag_family = rc->idiag_family; 978 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type); 979 req.idiag_ext = rc->idiag_ext; 980 req.idiag_states = rc->idiag_states; 981 req.id = rc->id; 982 983 return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req); 984 } 985 986 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh) 987 { 988 int hdrlen = sizeof(struct inet_diag_req); 989 struct net *net = sock_net(skb->sk); 990 991 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX || 992 nlmsg_len(nlh) < hdrlen) 993 return -EINVAL; 994 995 if (nlh->nlmsg_flags & NLM_F_DUMP) { 996 if (nlmsg_attrlen(nlh, hdrlen)) { 997 struct nlattr *attr; 998 999 attr = nlmsg_find_attr(nlh, hdrlen, 1000 INET_DIAG_REQ_BYTECODE); 1001 if (!attr || 1002 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 1003 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 1004 return -EINVAL; 1005 } 1006 { 1007 struct netlink_dump_control c = { 1008 .dump = inet_diag_dump_compat, 1009 }; 1010 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c); 1011 } 1012 } 1013 1014 return inet_diag_get_exact_compat(skb, nlh); 1015 } 1016 1017 static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h) 1018 { 1019 int hdrlen = sizeof(struct inet_diag_req_v2); 1020 struct net *net = sock_net(skb->sk); 1021 1022 if (nlmsg_len(h) < hdrlen) 1023 return -EINVAL; 1024 1025 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY && 1026 h->nlmsg_flags & NLM_F_DUMP) { 1027 if (nlmsg_attrlen(h, hdrlen)) { 1028 struct nlattr *attr; 1029 1030 attr = nlmsg_find_attr(h, hdrlen, 1031 INET_DIAG_REQ_BYTECODE); 1032 if (!attr || 1033 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 1034 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 1035 return -EINVAL; 1036 } 1037 { 1038 struct netlink_dump_control c = { 1039 .dump = inet_diag_dump, 1040 }; 1041 return netlink_dump_start(net->diag_nlsk, skb, h, &c); 1042 } 1043 } 1044 1045 return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h)); 1046 } 1047 1048 static 1049 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk) 1050 { 1051 const struct inet_diag_handler *handler; 1052 struct nlmsghdr *nlh; 1053 struct nlattr *attr; 1054 struct inet_diag_msg *r; 1055 void *info = NULL; 1056 int err = 0; 1057 1058 nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0); 1059 if (!nlh) 1060 return -ENOMEM; 1061 1062 r = nlmsg_data(nlh); 1063 memset(r, 0, sizeof(*r)); 1064 inet_diag_msg_common_fill(r, sk); 1065 if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM) 1066 r->id.idiag_sport = inet_sk(sk)->inet_sport; 1067 r->idiag_state = sk->sk_state; 1068 1069 if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) { 1070 nlmsg_cancel(skb, nlh); 1071 return err; 1072 } 1073 1074 handler = inet_diag_lock_handler(sk->sk_protocol); 1075 if (IS_ERR(handler)) { 1076 inet_diag_unlock_handler(handler); 1077 nlmsg_cancel(skb, nlh); 1078 return PTR_ERR(handler); 1079 } 1080 1081 attr = handler->idiag_info_size 1082 ? nla_reserve_64bit(skb, INET_DIAG_INFO, 1083 handler->idiag_info_size, 1084 INET_DIAG_PAD) 1085 : NULL; 1086 if (attr) 1087 info = nla_data(attr); 1088 1089 handler->idiag_get_info(sk, r, info); 1090 inet_diag_unlock_handler(handler); 1091 1092 nlmsg_end(skb, nlh); 1093 return 0; 1094 } 1095 1096 static const struct sock_diag_handler inet_diag_handler = { 1097 .family = AF_INET, 1098 .dump = inet_diag_handler_cmd, 1099 .get_info = inet_diag_handler_get_info, 1100 .destroy = inet_diag_handler_cmd, 1101 }; 1102 1103 static const struct sock_diag_handler inet6_diag_handler = { 1104 .family = AF_INET6, 1105 .dump = inet_diag_handler_cmd, 1106 .get_info = inet_diag_handler_get_info, 1107 .destroy = inet_diag_handler_cmd, 1108 }; 1109 1110 int inet_diag_register(const struct inet_diag_handler *h) 1111 { 1112 const __u16 type = h->idiag_type; 1113 int err = -EINVAL; 1114 1115 if (type >= IPPROTO_MAX) 1116 goto out; 1117 1118 mutex_lock(&inet_diag_table_mutex); 1119 err = -EEXIST; 1120 if (!inet_diag_table[type]) { 1121 inet_diag_table[type] = h; 1122 err = 0; 1123 } 1124 mutex_unlock(&inet_diag_table_mutex); 1125 out: 1126 return err; 1127 } 1128 EXPORT_SYMBOL_GPL(inet_diag_register); 1129 1130 void inet_diag_unregister(const struct inet_diag_handler *h) 1131 { 1132 const __u16 type = h->idiag_type; 1133 1134 if (type >= IPPROTO_MAX) 1135 return; 1136 1137 mutex_lock(&inet_diag_table_mutex); 1138 inet_diag_table[type] = NULL; 1139 mutex_unlock(&inet_diag_table_mutex); 1140 } 1141 EXPORT_SYMBOL_GPL(inet_diag_unregister); 1142 1143 static int __init inet_diag_init(void) 1144 { 1145 const int inet_diag_table_size = (IPPROTO_MAX * 1146 sizeof(struct inet_diag_handler *)); 1147 int err = -ENOMEM; 1148 1149 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL); 1150 if (!inet_diag_table) 1151 goto out; 1152 1153 err = sock_diag_register(&inet_diag_handler); 1154 if (err) 1155 goto out_free_nl; 1156 1157 err = sock_diag_register(&inet6_diag_handler); 1158 if (err) 1159 goto out_free_inet; 1160 1161 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat); 1162 out: 1163 return err; 1164 1165 out_free_inet: 1166 sock_diag_unregister(&inet_diag_handler); 1167 out_free_nl: 1168 kfree(inet_diag_table); 1169 goto out; 1170 } 1171 1172 static void __exit inet_diag_exit(void) 1173 { 1174 sock_diag_unregister(&inet6_diag_handler); 1175 sock_diag_unregister(&inet_diag_handler); 1176 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat); 1177 kfree(inet_diag_table); 1178 } 1179 1180 module_init(inet_diag_init); 1181 module_exit(inet_diag_exit); 1182 MODULE_LICENSE("GPL"); 1183 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */); 1184 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */); 1185