1 /* 2 * inet_diag.c Module for monitoring INET transport protocols sockets. 3 * 4 * Version: $Id: inet_diag.c,v 1.3 2002/02/01 22:01:04 davem Exp $ 5 * 6 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License 10 * as published by the Free Software Foundation; either version 11 * 2 of the License, or (at your option) any later version. 12 */ 13 14 #include <linux/config.h> 15 #include <linux/module.h> 16 #include <linux/types.h> 17 #include <linux/fcntl.h> 18 #include <linux/random.h> 19 #include <linux/cache.h> 20 #include <linux/init.h> 21 #include <linux/time.h> 22 23 #include <net/icmp.h> 24 #include <net/tcp.h> 25 #include <net/ipv6.h> 26 #include <net/inet_common.h> 27 #include <net/inet_connection_sock.h> 28 #include <net/inet_hashtables.h> 29 #include <net/inet_timewait_sock.h> 30 #include <net/inet6_hashtables.h> 31 32 #include <linux/inet.h> 33 #include <linux/stddef.h> 34 35 #include <linux/inet_diag.h> 36 37 static const struct inet_diag_handler **inet_diag_table; 38 39 struct inet_diag_entry { 40 u32 *saddr; 41 u32 *daddr; 42 u16 sport; 43 u16 dport; 44 u16 family; 45 u16 userlocks; 46 }; 47 48 static struct sock *idiagnl; 49 50 #define INET_DIAG_PUT(skb, attrtype, attrlen) \ 51 RTA_DATA(__RTA_PUT(skb, attrtype, attrlen)) 52 53 static int inet_diag_fill(struct sk_buff *skb, struct sock *sk, 54 int ext, u32 pid, u32 seq, u16 nlmsg_flags, 55 const struct nlmsghdr *unlh) 56 { 57 const struct inet_sock *inet = inet_sk(sk); 58 const struct inet_connection_sock *icsk = inet_csk(sk); 59 struct inet_diag_msg *r; 60 struct nlmsghdr *nlh; 61 void *info = NULL; 62 struct inet_diag_meminfo *minfo = NULL; 63 unsigned char *b = skb->tail; 64 const struct inet_diag_handler *handler; 65 66 handler = inet_diag_table[unlh->nlmsg_type]; 67 BUG_ON(handler == NULL); 68 69 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); 70 nlh->nlmsg_flags = nlmsg_flags; 71 72 r = NLMSG_DATA(nlh); 73 if (sk->sk_state != TCP_TIME_WAIT) { 74 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) 75 minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, 76 sizeof(*minfo)); 77 if (ext & (1 << (INET_DIAG_INFO - 1))) 78 info = INET_DIAG_PUT(skb, INET_DIAG_INFO, 79 handler->idiag_info_size); 80 81 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) { 82 size_t len = strlen(icsk->icsk_ca_ops->name); 83 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1), 84 icsk->icsk_ca_ops->name); 85 } 86 } 87 r->idiag_family = sk->sk_family; 88 r->idiag_state = sk->sk_state; 89 r->idiag_timer = 0; 90 r->idiag_retrans = 0; 91 92 r->id.idiag_if = sk->sk_bound_dev_if; 93 r->id.idiag_cookie[0] = (u32)(unsigned long)sk; 94 r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1); 95 96 if (r->idiag_state == TCP_TIME_WAIT) { 97 const struct inet_timewait_sock *tw = inet_twsk(sk); 98 long tmo = tw->tw_ttd - jiffies; 99 if (tmo < 0) 100 tmo = 0; 101 102 r->id.idiag_sport = tw->tw_sport; 103 r->id.idiag_dport = tw->tw_dport; 104 r->id.idiag_src[0] = tw->tw_rcv_saddr; 105 r->id.idiag_dst[0] = tw->tw_daddr; 106 r->idiag_state = tw->tw_substate; 107 r->idiag_timer = 3; 108 r->idiag_expires = (tmo * 1000 + HZ - 1) / HZ; 109 r->idiag_rqueue = 0; 110 r->idiag_wqueue = 0; 111 r->idiag_uid = 0; 112 r->idiag_inode = 0; 113 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 114 if (r->idiag_family == AF_INET6) { 115 const struct tcp6_timewait_sock *tcp6tw = tcp6_twsk(sk); 116 117 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, 118 &tcp6tw->tw_v6_rcv_saddr); 119 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, 120 &tcp6tw->tw_v6_daddr); 121 } 122 #endif 123 nlh->nlmsg_len = skb->tail - b; 124 return skb->len; 125 } 126 127 r->id.idiag_sport = inet->sport; 128 r->id.idiag_dport = inet->dport; 129 r->id.idiag_src[0] = inet->rcv_saddr; 130 r->id.idiag_dst[0] = inet->daddr; 131 132 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 133 if (r->idiag_family == AF_INET6) { 134 struct ipv6_pinfo *np = inet6_sk(sk); 135 136 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, 137 &np->rcv_saddr); 138 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, 139 &np->daddr); 140 } 141 #endif 142 143 #define EXPIRES_IN_MS(tmo) ((tmo - jiffies) * 1000 + HZ - 1) / HZ 144 145 if (icsk->icsk_pending == ICSK_TIME_RETRANS) { 146 r->idiag_timer = 1; 147 r->idiag_retrans = icsk->icsk_retransmits; 148 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 149 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { 150 r->idiag_timer = 4; 151 r->idiag_retrans = icsk->icsk_probes_out; 152 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 153 } else if (timer_pending(&sk->sk_timer)) { 154 r->idiag_timer = 2; 155 r->idiag_retrans = icsk->icsk_probes_out; 156 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires); 157 } else { 158 r->idiag_timer = 0; 159 r->idiag_expires = 0; 160 } 161 #undef EXPIRES_IN_MS 162 163 r->idiag_uid = sock_i_uid(sk); 164 r->idiag_inode = sock_i_ino(sk); 165 166 if (minfo) { 167 minfo->idiag_rmem = atomic_read(&sk->sk_rmem_alloc); 168 minfo->idiag_wmem = sk->sk_wmem_queued; 169 minfo->idiag_fmem = sk->sk_forward_alloc; 170 minfo->idiag_tmem = atomic_read(&sk->sk_wmem_alloc); 171 } 172 173 handler->idiag_get_info(sk, r, info); 174 175 if (sk->sk_state < TCP_TIME_WAIT && 176 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info) 177 icsk->icsk_ca_ops->get_info(sk, ext, skb); 178 179 nlh->nlmsg_len = skb->tail - b; 180 return skb->len; 181 182 rtattr_failure: 183 nlmsg_failure: 184 skb_trim(skb, b - skb->data); 185 return -1; 186 } 187 188 static int inet_diag_get_exact(struct sk_buff *in_skb, const struct nlmsghdr *nlh) 189 { 190 int err; 191 struct sock *sk; 192 struct inet_diag_req *req = NLMSG_DATA(nlh); 193 struct sk_buff *rep; 194 struct inet_hashinfo *hashinfo; 195 const struct inet_diag_handler *handler; 196 197 handler = inet_diag_table[nlh->nlmsg_type]; 198 BUG_ON(handler == NULL); 199 hashinfo = handler->idiag_hashinfo; 200 201 if (req->idiag_family == AF_INET) { 202 sk = inet_lookup(hashinfo, req->id.idiag_dst[0], 203 req->id.idiag_dport, req->id.idiag_src[0], 204 req->id.idiag_sport, req->id.idiag_if); 205 } 206 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 207 else if (req->idiag_family == AF_INET6) { 208 sk = inet6_lookup(hashinfo, 209 (struct in6_addr *)req->id.idiag_dst, 210 req->id.idiag_dport, 211 (struct in6_addr *)req->id.idiag_src, 212 req->id.idiag_sport, 213 req->id.idiag_if); 214 } 215 #endif 216 else { 217 return -EINVAL; 218 } 219 220 if (sk == NULL) 221 return -ENOENT; 222 223 err = -ESTALE; 224 if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE || 225 req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) && 226 ((u32)(unsigned long)sk != req->id.idiag_cookie[0] || 227 (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1])) 228 goto out; 229 230 err = -ENOMEM; 231 rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) + 232 sizeof(struct inet_diag_meminfo) + 233 handler->idiag_info_size + 64)), 234 GFP_KERNEL); 235 if (!rep) 236 goto out; 237 238 if (inet_diag_fill(rep, sk, req->idiag_ext, 239 NETLINK_CB(in_skb).pid, 240 nlh->nlmsg_seq, 0, nlh) <= 0) 241 BUG(); 242 243 err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid, 244 MSG_DONTWAIT); 245 if (err > 0) 246 err = 0; 247 248 out: 249 if (sk) { 250 if (sk->sk_state == TCP_TIME_WAIT) 251 inet_twsk_put((struct inet_timewait_sock *)sk); 252 else 253 sock_put(sk); 254 } 255 return err; 256 } 257 258 static int bitstring_match(const u32 *a1, const u32 *a2, int bits) 259 { 260 int words = bits >> 5; 261 262 bits &= 0x1f; 263 264 if (words) { 265 if (memcmp(a1, a2, words << 2)) 266 return 0; 267 } 268 if (bits) { 269 __u32 w1, w2; 270 __u32 mask; 271 272 w1 = a1[words]; 273 w2 = a2[words]; 274 275 mask = htonl((0xffffffff) << (32 - bits)); 276 277 if ((w1 ^ w2) & mask) 278 return 0; 279 } 280 281 return 1; 282 } 283 284 285 static int inet_diag_bc_run(const void *bc, int len, 286 const struct inet_diag_entry *entry) 287 { 288 while (len > 0) { 289 int yes = 1; 290 const struct inet_diag_bc_op *op = bc; 291 292 switch (op->code) { 293 case INET_DIAG_BC_NOP: 294 break; 295 case INET_DIAG_BC_JMP: 296 yes = 0; 297 break; 298 case INET_DIAG_BC_S_GE: 299 yes = entry->sport >= op[1].no; 300 break; 301 case INET_DIAG_BC_S_LE: 302 yes = entry->dport <= op[1].no; 303 break; 304 case INET_DIAG_BC_D_GE: 305 yes = entry->dport >= op[1].no; 306 break; 307 case INET_DIAG_BC_D_LE: 308 yes = entry->dport <= op[1].no; 309 break; 310 case INET_DIAG_BC_AUTO: 311 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); 312 break; 313 case INET_DIAG_BC_S_COND: 314 case INET_DIAG_BC_D_COND: { 315 struct inet_diag_hostcond *cond; 316 u32 *addr; 317 318 cond = (struct inet_diag_hostcond *)(op + 1); 319 if (cond->port != -1 && 320 cond->port != (op->code == INET_DIAG_BC_S_COND ? 321 entry->sport : entry->dport)) { 322 yes = 0; 323 break; 324 } 325 326 if (cond->prefix_len == 0) 327 break; 328 329 if (op->code == INET_DIAG_BC_S_COND) 330 addr = entry->saddr; 331 else 332 addr = entry->daddr; 333 334 if (bitstring_match(addr, cond->addr, cond->prefix_len)) 335 break; 336 if (entry->family == AF_INET6 && 337 cond->family == AF_INET) { 338 if (addr[0] == 0 && addr[1] == 0 && 339 addr[2] == htonl(0xffff) && 340 bitstring_match(addr + 3, cond->addr, 341 cond->prefix_len)) 342 break; 343 } 344 yes = 0; 345 break; 346 } 347 } 348 349 if (yes) { 350 len -= op->yes; 351 bc += op->yes; 352 } else { 353 len -= op->no; 354 bc += op->no; 355 } 356 } 357 return (len == 0); 358 } 359 360 static int valid_cc(const void *bc, int len, int cc) 361 { 362 while (len >= 0) { 363 const struct inet_diag_bc_op *op = bc; 364 365 if (cc > len) 366 return 0; 367 if (cc == len) 368 return 1; 369 if (op->yes < 4) 370 return 0; 371 len -= op->yes; 372 bc += op->yes; 373 } 374 return 0; 375 } 376 377 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len) 378 { 379 const unsigned char *bc = bytecode; 380 int len = bytecode_len; 381 382 while (len > 0) { 383 struct inet_diag_bc_op *op = (struct inet_diag_bc_op *)bc; 384 385 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len); 386 switch (op->code) { 387 case INET_DIAG_BC_AUTO: 388 case INET_DIAG_BC_S_COND: 389 case INET_DIAG_BC_D_COND: 390 case INET_DIAG_BC_S_GE: 391 case INET_DIAG_BC_S_LE: 392 case INET_DIAG_BC_D_GE: 393 case INET_DIAG_BC_D_LE: 394 if (op->yes < 4 || op->yes > len + 4) 395 return -EINVAL; 396 case INET_DIAG_BC_JMP: 397 if (op->no < 4 || op->no > len + 4) 398 return -EINVAL; 399 if (op->no < len && 400 !valid_cc(bytecode, bytecode_len, len - op->no)) 401 return -EINVAL; 402 break; 403 case INET_DIAG_BC_NOP: 404 if (op->yes < 4 || op->yes > len + 4) 405 return -EINVAL; 406 break; 407 default: 408 return -EINVAL; 409 } 410 bc += op->yes; 411 len -= op->yes; 412 } 413 return len == 0 ? 0 : -EINVAL; 414 } 415 416 static int inet_diag_dump_sock(struct sk_buff *skb, struct sock *sk, 417 struct netlink_callback *cb) 418 { 419 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 420 421 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { 422 struct inet_diag_entry entry; 423 struct rtattr *bc = (struct rtattr *)(r + 1); 424 struct inet_sock *inet = inet_sk(sk); 425 426 entry.family = sk->sk_family; 427 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 428 if (entry.family == AF_INET6) { 429 struct ipv6_pinfo *np = inet6_sk(sk); 430 431 entry.saddr = np->rcv_saddr.s6_addr32; 432 entry.daddr = np->daddr.s6_addr32; 433 } else 434 #endif 435 { 436 entry.saddr = &inet->rcv_saddr; 437 entry.daddr = &inet->daddr; 438 } 439 entry.sport = inet->num; 440 entry.dport = ntohs(inet->dport); 441 entry.userlocks = sk->sk_userlocks; 442 443 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry)) 444 return 0; 445 } 446 447 return inet_diag_fill(skb, sk, r->idiag_ext, NETLINK_CB(cb->skb).pid, 448 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 449 } 450 451 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk, 452 struct request_sock *req, 453 u32 pid, u32 seq, 454 const struct nlmsghdr *unlh) 455 { 456 const struct inet_request_sock *ireq = inet_rsk(req); 457 struct inet_sock *inet = inet_sk(sk); 458 unsigned char *b = skb->tail; 459 struct inet_diag_msg *r; 460 struct nlmsghdr *nlh; 461 long tmo; 462 463 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); 464 nlh->nlmsg_flags = NLM_F_MULTI; 465 r = NLMSG_DATA(nlh); 466 467 r->idiag_family = sk->sk_family; 468 r->idiag_state = TCP_SYN_RECV; 469 r->idiag_timer = 1; 470 r->idiag_retrans = req->retrans; 471 472 r->id.idiag_if = sk->sk_bound_dev_if; 473 r->id.idiag_cookie[0] = (u32)(unsigned long)req; 474 r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1); 475 476 tmo = req->expires - jiffies; 477 if (tmo < 0) 478 tmo = 0; 479 480 r->id.idiag_sport = inet->sport; 481 r->id.idiag_dport = ireq->rmt_port; 482 r->id.idiag_src[0] = ireq->loc_addr; 483 r->id.idiag_dst[0] = ireq->rmt_addr; 484 r->idiag_expires = jiffies_to_msecs(tmo); 485 r->idiag_rqueue = 0; 486 r->idiag_wqueue = 0; 487 r->idiag_uid = sock_i_uid(sk); 488 r->idiag_inode = 0; 489 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 490 if (r->idiag_family == AF_INET6) { 491 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, 492 &tcp6_rsk(req)->loc_addr); 493 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, 494 &tcp6_rsk(req)->rmt_addr); 495 } 496 #endif 497 nlh->nlmsg_len = skb->tail - b; 498 499 return skb->len; 500 501 nlmsg_failure: 502 skb_trim(skb, b - skb->data); 503 return -1; 504 } 505 506 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk, 507 struct netlink_callback *cb) 508 { 509 struct inet_diag_entry entry; 510 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 511 struct inet_connection_sock *icsk = inet_csk(sk); 512 struct listen_sock *lopt; 513 struct rtattr *bc = NULL; 514 struct inet_sock *inet = inet_sk(sk); 515 int j, s_j; 516 int reqnum, s_reqnum; 517 int err = 0; 518 519 s_j = cb->args[3]; 520 s_reqnum = cb->args[4]; 521 522 if (s_j > 0) 523 s_j--; 524 525 entry.family = sk->sk_family; 526 527 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 528 529 lopt = icsk->icsk_accept_queue.listen_opt; 530 if (!lopt || !lopt->qlen) 531 goto out; 532 533 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { 534 bc = (struct rtattr *)(r + 1); 535 entry.sport = inet->num; 536 entry.userlocks = sk->sk_userlocks; 537 } 538 539 for (j = s_j; j < lopt->nr_table_entries; j++) { 540 struct request_sock *req, *head = lopt->syn_table[j]; 541 542 reqnum = 0; 543 for (req = head; req; reqnum++, req = req->dl_next) { 544 struct inet_request_sock *ireq = inet_rsk(req); 545 546 if (reqnum < s_reqnum) 547 continue; 548 if (r->id.idiag_dport != ireq->rmt_port && 549 r->id.idiag_dport) 550 continue; 551 552 if (bc) { 553 entry.saddr = 554 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 555 (entry.family == AF_INET6) ? 556 tcp6_rsk(req)->loc_addr.s6_addr32 : 557 #endif 558 &ireq->loc_addr; 559 entry.daddr = 560 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 561 (entry.family == AF_INET6) ? 562 tcp6_rsk(req)->rmt_addr.s6_addr32 : 563 #endif 564 &ireq->rmt_addr; 565 entry.dport = ntohs(ireq->rmt_port); 566 567 if (!inet_diag_bc_run(RTA_DATA(bc), 568 RTA_PAYLOAD(bc), &entry)) 569 continue; 570 } 571 572 err = inet_diag_fill_req(skb, sk, req, 573 NETLINK_CB(cb->skb).pid, 574 cb->nlh->nlmsg_seq, cb->nlh); 575 if (err < 0) { 576 cb->args[3] = j + 1; 577 cb->args[4] = reqnum; 578 goto out; 579 } 580 } 581 582 s_reqnum = 0; 583 } 584 585 out: 586 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 587 588 return err; 589 } 590 591 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) 592 { 593 int i, num; 594 int s_i, s_num; 595 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 596 const struct inet_diag_handler *handler; 597 struct inet_hashinfo *hashinfo; 598 599 handler = inet_diag_table[cb->nlh->nlmsg_type]; 600 BUG_ON(handler == NULL); 601 hashinfo = handler->idiag_hashinfo; 602 603 s_i = cb->args[1]; 604 s_num = num = cb->args[2]; 605 606 if (cb->args[0] == 0) { 607 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV))) 608 goto skip_listen_ht; 609 610 inet_listen_lock(hashinfo); 611 for (i = s_i; i < INET_LHTABLE_SIZE; i++) { 612 struct sock *sk; 613 struct hlist_node *node; 614 615 num = 0; 616 sk_for_each(sk, node, &hashinfo->listening_hash[i]) { 617 struct inet_sock *inet = inet_sk(sk); 618 619 if (num < s_num) { 620 num++; 621 continue; 622 } 623 624 if (r->id.idiag_sport != inet->sport && 625 r->id.idiag_sport) 626 goto next_listen; 627 628 if (!(r->idiag_states & TCPF_LISTEN) || 629 r->id.idiag_dport || 630 cb->args[3] > 0) 631 goto syn_recv; 632 633 if (inet_diag_dump_sock(skb, sk, cb) < 0) { 634 inet_listen_unlock(hashinfo); 635 goto done; 636 } 637 638 syn_recv: 639 if (!(r->idiag_states & TCPF_SYN_RECV)) 640 goto next_listen; 641 642 if (inet_diag_dump_reqs(skb, sk, cb) < 0) { 643 inet_listen_unlock(hashinfo); 644 goto done; 645 } 646 647 next_listen: 648 cb->args[3] = 0; 649 cb->args[4] = 0; 650 ++num; 651 } 652 653 s_num = 0; 654 cb->args[3] = 0; 655 cb->args[4] = 0; 656 } 657 inet_listen_unlock(hashinfo); 658 skip_listen_ht: 659 cb->args[0] = 1; 660 s_i = num = s_num = 0; 661 } 662 663 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV))) 664 return skb->len; 665 666 for (i = s_i; i < hashinfo->ehash_size; i++) { 667 struct inet_ehash_bucket *head = &hashinfo->ehash[i]; 668 struct sock *sk; 669 struct hlist_node *node; 670 671 if (i > s_i) 672 s_num = 0; 673 674 read_lock_bh(&head->lock); 675 676 num = 0; 677 sk_for_each(sk, node, &head->chain) { 678 struct inet_sock *inet = inet_sk(sk); 679 680 if (num < s_num) 681 goto next_normal; 682 if (!(r->idiag_states & (1 << sk->sk_state))) 683 goto next_normal; 684 if (r->id.idiag_sport != inet->sport && 685 r->id.idiag_sport) 686 goto next_normal; 687 if (r->id.idiag_dport != inet->dport && r->id.idiag_dport) 688 goto next_normal; 689 if (inet_diag_dump_sock(skb, sk, cb) < 0) { 690 read_unlock_bh(&head->lock); 691 goto done; 692 } 693 next_normal: 694 ++num; 695 } 696 697 if (r->idiag_states & TCPF_TIME_WAIT) { 698 sk_for_each(sk, node, 699 &hashinfo->ehash[i + hashinfo->ehash_size].chain) { 700 struct inet_sock *inet = inet_sk(sk); 701 702 if (num < s_num) 703 goto next_dying; 704 if (r->id.idiag_sport != inet->sport && 705 r->id.idiag_sport) 706 goto next_dying; 707 if (r->id.idiag_dport != inet->dport && 708 r->id.idiag_dport) 709 goto next_dying; 710 if (inet_diag_dump_sock(skb, sk, cb) < 0) { 711 read_unlock_bh(&head->lock); 712 goto done; 713 } 714 next_dying: 715 ++num; 716 } 717 } 718 read_unlock_bh(&head->lock); 719 } 720 721 done: 722 cb->args[1] = i; 723 cb->args[2] = num; 724 return skb->len; 725 } 726 727 static int inet_diag_dump_done(struct netlink_callback *cb) 728 { 729 return 0; 730 } 731 732 733 static __inline__ int 734 inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 735 { 736 if (!(nlh->nlmsg_flags&NLM_F_REQUEST)) 737 return 0; 738 739 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX) 740 goto err_inval; 741 742 if (inet_diag_table[nlh->nlmsg_type] == NULL) 743 return -ENOENT; 744 745 if (NLMSG_LENGTH(sizeof(struct inet_diag_req)) > skb->len) 746 goto err_inval; 747 748 if (nlh->nlmsg_flags&NLM_F_DUMP) { 749 if (nlh->nlmsg_len > 750 (4 + NLMSG_SPACE(sizeof(struct inet_diag_req)))) { 751 struct rtattr *rta = (void *)(NLMSG_DATA(nlh) + 752 sizeof(struct inet_diag_req)); 753 if (rta->rta_type != INET_DIAG_REQ_BYTECODE || 754 rta->rta_len < 8 || 755 rta->rta_len > 756 (nlh->nlmsg_len - 757 NLMSG_SPACE(sizeof(struct inet_diag_req)))) 758 goto err_inval; 759 if (inet_diag_bc_audit(RTA_DATA(rta), RTA_PAYLOAD(rta))) 760 goto err_inval; 761 } 762 return netlink_dump_start(idiagnl, skb, nlh, 763 inet_diag_dump, 764 inet_diag_dump_done); 765 } else { 766 return inet_diag_get_exact(skb, nlh); 767 } 768 769 err_inval: 770 return -EINVAL; 771 } 772 773 774 static inline void inet_diag_rcv_skb(struct sk_buff *skb) 775 { 776 int err; 777 struct nlmsghdr * nlh; 778 779 if (skb->len >= NLMSG_SPACE(0)) { 780 nlh = (struct nlmsghdr *)skb->data; 781 if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len) 782 return; 783 err = inet_diag_rcv_msg(skb, nlh); 784 if (err || nlh->nlmsg_flags & NLM_F_ACK) 785 netlink_ack(skb, nlh, err); 786 } 787 } 788 789 static void inet_diag_rcv(struct sock *sk, int len) 790 { 791 struct sk_buff *skb; 792 unsigned int qlen = skb_queue_len(&sk->sk_receive_queue); 793 794 while (qlen-- && (skb = skb_dequeue(&sk->sk_receive_queue))) { 795 inet_diag_rcv_skb(skb); 796 kfree_skb(skb); 797 } 798 } 799 800 static void tcp_diag_get_info(struct sock *sk, struct inet_diag_msg *r, 801 void *_info) 802 { 803 const struct tcp_sock *tp = tcp_sk(sk); 804 struct tcp_info *info = _info; 805 806 r->idiag_rqueue = tp->rcv_nxt - tp->copied_seq; 807 r->idiag_wqueue = tp->write_seq - tp->snd_una; 808 if (info != NULL) 809 tcp_get_info(sk, info); 810 } 811 812 static struct inet_diag_handler tcp_diag_handler = { 813 .idiag_hashinfo = &tcp_hashinfo, 814 .idiag_get_info = tcp_diag_get_info, 815 .idiag_type = TCPDIAG_GETSOCK, 816 .idiag_info_size = sizeof(struct tcp_info), 817 }; 818 819 static DEFINE_SPINLOCK(inet_diag_register_lock); 820 821 int inet_diag_register(const struct inet_diag_handler *h) 822 { 823 const __u16 type = h->idiag_type; 824 int err = -EINVAL; 825 826 if (type >= INET_DIAG_GETSOCK_MAX) 827 goto out; 828 829 spin_lock(&inet_diag_register_lock); 830 err = -EEXIST; 831 if (inet_diag_table[type] == NULL) { 832 inet_diag_table[type] = h; 833 err = 0; 834 } 835 spin_unlock(&inet_diag_register_lock); 836 out: 837 return err; 838 } 839 EXPORT_SYMBOL_GPL(inet_diag_register); 840 841 void inet_diag_unregister(const struct inet_diag_handler *h) 842 { 843 const __u16 type = h->idiag_type; 844 845 if (type >= INET_DIAG_GETSOCK_MAX) 846 return; 847 848 spin_lock(&inet_diag_register_lock); 849 inet_diag_table[type] = NULL; 850 spin_unlock(&inet_diag_register_lock); 851 852 synchronize_rcu(); 853 } 854 EXPORT_SYMBOL_GPL(inet_diag_unregister); 855 856 static int __init inet_diag_init(void) 857 { 858 const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX * 859 sizeof(struct inet_diag_handler *)); 860 int err = -ENOMEM; 861 862 inet_diag_table = kmalloc(inet_diag_table_size, GFP_KERNEL); 863 if (!inet_diag_table) 864 goto out; 865 866 memset(inet_diag_table, 0, inet_diag_table_size); 867 868 idiagnl = netlink_kernel_create(NETLINK_INET_DIAG, inet_diag_rcv, 869 THIS_MODULE); 870 if (idiagnl == NULL) 871 goto out_free_table; 872 873 err = inet_diag_register(&tcp_diag_handler); 874 if (err) 875 goto out_sock_release; 876 out: 877 return err; 878 out_sock_release: 879 sock_release(idiagnl->sk_socket); 880 out_free_table: 881 kfree(inet_diag_table); 882 goto out; 883 } 884 885 static void __exit inet_diag_exit(void) 886 { 887 sock_release(idiagnl->sk_socket); 888 kfree(inet_diag_table); 889 } 890 891 module_init(inet_diag_init); 892 module_exit(inet_diag_exit); 893 MODULE_LICENSE("GPL"); 894