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