net/ipv4/tcp_diag.c

   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
  28 #include <linux/inet.h>
  29 #include <linux/stddef.h>
  30
  31 #include <linux/tcp_diag.h>
  32
  33 struct tcpdiag_entry
  34 {
  35         u32 *saddr;
  36         u32 *daddr;
  37         u16 sport;
  38         u16 dport;
  39         u16 family;
  40         u16 userlocks;
  41 };
  42
  43 static struct sock *tcpnl;
  44
  45 #define TCPDIAG_PUT(skb, attrtype, attrlen) \
  46         RTA_DATA(__RTA_PUT(skb, attrtype, attrlen))
  47
  48 static int tcpdiag_fill(struct sk_buff *skb, struct sock *sk,
  49                         int ext, u32 pid, u32 seq, u16 nlmsg_flags)
  50 {
  51         struct inet_sock *inet = inet_sk(sk);
  52         struct tcp_sock *tp = tcp_sk(sk);
  53         struct tcpdiagmsg *r;
  54         struct nlmsghdr  *nlh;
  55         struct tcp_info  *info = NULL;
  56         struct tcpdiag_meminfo  *minfo = NULL;
  57         unsigned char    *b = skb->tail;
  58
  59         nlh = NLMSG_PUT(skb, pid, seq, TCPDIAG_GETSOCK, sizeof(*r));
  60         nlh->nlmsg_flags = nlmsg_flags;
  61         r = NLMSG_DATA(nlh);
  62         if (sk->sk_state != TCP_TIME_WAIT) {
  63                 if (ext & (1<<(TCPDIAG_MEMINFO-1)))
  64                         minfo = TCPDIAG_PUT(skb, TCPDIAG_MEMINFO, sizeof(*minfo));
  65                 if (ext & (1<<(TCPDIAG_INFO-1)))
  66                         info = TCPDIAG_PUT(skb, TCPDIAG_INFO, sizeof(*info));
  67
  68                 if (ext & (1<<(TCPDIAG_CONG-1))) {
  69                         size_t len = strlen(tp->ca_ops->name);
  70                         strcpy(TCPDIAG_PUT(skb, TCPDIAG_CONG, len+1),
  71                                tp->ca_ops->name);
  72                 }
  73         }
  74         r->tcpdiag_family = sk->sk_family;
  75         r->tcpdiag_state = sk->sk_state;
  76         r->tcpdiag_timer = 0;
  77         r->tcpdiag_retrans = 0;
  78
  79         r->id.tcpdiag_if = sk->sk_bound_dev_if;
  80         r->id.tcpdiag_cookie[0] = (u32)(unsigned long)sk;
  81         r->id.tcpdiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
  82
  83         if (r->tcpdiag_state == TCP_TIME_WAIT) {
  84                 struct tcp_tw_bucket *tw = (struct tcp_tw_bucket*)sk;
  85                 long tmo = tw->tw_ttd - jiffies;
  86                 if (tmo < 0)
  87                         tmo = 0;
  88
  89                 r->id.tcpdiag_sport = tw->tw_sport;
  90                 r->id.tcpdiag_dport = tw->tw_dport;
  91                 r->id.tcpdiag_src[0] = tw->tw_rcv_saddr;
  92                 r->id.tcpdiag_dst[0] = tw->tw_daddr;
  93                 r->tcpdiag_state = tw->tw_substate;
  94                 r->tcpdiag_timer = 3;
  95                 r->tcpdiag_expires = (tmo*1000+HZ-1)/HZ;
  96                 r->tcpdiag_rqueue = 0;
  97                 r->tcpdiag_wqueue = 0;
  98                 r->tcpdiag_uid = 0;
  99                 r->tcpdiag_inode = 0;
 100 #ifdef CONFIG_IP_TCPDIAG_IPV6
 101                 if (r->tcpdiag_family == AF_INET6) {
 102                         ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src,
 103                                        &tw->tw_v6_rcv_saddr);
 104                         ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst,
 105                                        &tw->tw_v6_daddr);
 106                 }
 107 #endif
 108                 nlh->nlmsg_len = skb->tail - b;
 109                 return skb->len;
 110         }
 111
 112         r->id.tcpdiag_sport = inet->sport;
 113         r->id.tcpdiag_dport = inet->dport;
 114         r->id.tcpdiag_src[0] = inet->rcv_saddr;
 115         r->id.tcpdiag_dst[0] = inet->daddr;
 116
 117 #ifdef CONFIG_IP_TCPDIAG_IPV6
 118         if (r->tcpdiag_family == AF_INET6) {
 119                 struct ipv6_pinfo *np = inet6_sk(sk);
 120
 121                 ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src,
 122                                &np->rcv_saddr);
 123                 ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst,
 124                                &np->daddr);
 125         }
 126 #endif
 127
 128 #define EXPIRES_IN_MS(tmo)  ((tmo-jiffies)*1000+HZ-1)/HZ
 129
 130         if (tp->pending == TCP_TIME_RETRANS) {
 131                 r->tcpdiag_timer = 1;
 132                 r->tcpdiag_retrans = tp->retransmits;
 133                 r->tcpdiag_expires = EXPIRES_IN_MS(tp->timeout);
 134         } else if (tp->pending == TCP_TIME_PROBE0) {
 135                 r->tcpdiag_timer = 4;
 136                 r->tcpdiag_retrans = tp->probes_out;
 137                 r->tcpdiag_expires = EXPIRES_IN_MS(tp->timeout);
 138         } else if (timer_pending(&sk->sk_timer)) {
 139                 r->tcpdiag_timer = 2;
 140                 r->tcpdiag_retrans = tp->probes_out;
 141                 r->tcpdiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
 142         } else {
 143                 r->tcpdiag_timer = 0;
 144                 r->tcpdiag_expires = 0;
 145         }
 146 #undef EXPIRES_IN_MS
 147
 148         r->tcpdiag_rqueue = tp->rcv_nxt - tp->copied_seq;
 149         r->tcpdiag_wqueue = tp->write_seq - tp->snd_una;
 150         r->tcpdiag_uid = sock_i_uid(sk);
 151         r->tcpdiag_inode = sock_i_ino(sk);
 152
 153         if (minfo) {
 154                 minfo->tcpdiag_rmem = atomic_read(&sk->sk_rmem_alloc);
 155                 minfo->tcpdiag_wmem = sk->sk_wmem_queued;
 156                 minfo->tcpdiag_fmem = sk->sk_forward_alloc;
 157                 minfo->tcpdiag_tmem = atomic_read(&sk->sk_wmem_alloc);
 158         }
 159
 160         if (info)
 161                 tcp_get_info(sk, info);
 162
 163         if (sk->sk_state < TCP_TIME_WAIT && tp->ca_ops->get_info)
 164                 tp->ca_ops->get_info(tp, ext, skb);
 165
 166         nlh->nlmsg_len = skb->tail - b;
 167         return skb->len;
 168
 169 rtattr_failure:
 170 nlmsg_failure:
 171         skb_trim(skb, b - skb->data);
 172         return -1;
 173 }
 174
 175 extern struct sock *tcp_v4_lookup(u32 saddr, u16 sport, u32 daddr, u16 dport,
 176                                   int dif);
 177 #ifdef CONFIG_IP_TCPDIAG_IPV6
 178 extern struct sock *tcp_v6_lookup(struct in6_addr *saddr, u16 sport,
 179                                   struct in6_addr *daddr, u16 dport,
 180                                   int dif);
 181 #else
 182 static inline struct sock *tcp_v6_lookup(struct in6_addr *saddr, u16 sport,
 183                                          struct in6_addr *daddr, u16 dport,
 184                                          int dif)
 185 {
 186         return NULL;
 187 }
 188 #endif
 189
 190 static int tcpdiag_get_exact(struct sk_buff *in_skb, const struct nlmsghdr *nlh)
 191 {
 192         int err;
 193         struct sock *sk;
 194         struct tcpdiagreq *req = NLMSG_DATA(nlh);
 195         struct sk_buff *rep;
 196
 197         if (req->tcpdiag_family == AF_INET) {
 198                 sk = tcp_v4_lookup(req->id.tcpdiag_dst[0], req->id.tcpdiag_dport,
 199                                    req->id.tcpdiag_src[0], req->id.tcpdiag_sport,
 200                                    req->id.tcpdiag_if);
 201         }
 202 #ifdef CONFIG_IP_TCPDIAG_IPV6
 203         else if (req->tcpdiag_family == AF_INET6) {
 204                 sk = tcp_v6_lookup((struct in6_addr*)req->id.tcpdiag_dst, req->id.tcpdiag_dport,
 205                                    (struct in6_addr*)req->id.tcpdiag_src, req->id.tcpdiag_sport,
 206                                    req->id.tcpdiag_if);
 207         }
 208 #endif
 209         else {
 210                 return -EINVAL;
 211         }
 212
 213         if (sk == NULL)
 214                 return -ENOENT;
 215
 216         err = -ESTALE;
 217         if ((req->id.tcpdiag_cookie[0] != TCPDIAG_NOCOOKIE ||
 218              req->id.tcpdiag_cookie[1] != TCPDIAG_NOCOOKIE) &&
 219             ((u32)(unsigned long)sk != req->id.tcpdiag_cookie[0] ||
 220              (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.tcpdiag_cookie[1]))
 221                 goto out;
 222
 223         err = -ENOMEM;
 224         rep = alloc_skb(NLMSG_SPACE(sizeof(struct tcpdiagmsg)+
 225                                     sizeof(struct tcpdiag_meminfo)+
 226                                     sizeof(struct tcp_info)+64), GFP_KERNEL);
 227         if (!rep)
 228                 goto out;
 229
 230         if (tcpdiag_fill(rep, sk, req->tcpdiag_ext,
 231                          NETLINK_CB(in_skb).pid,
 232                          nlh->nlmsg_seq, 0) <= 0)
 233                 BUG();
 234
 235         err = netlink_unicast(tcpnl, rep, NETLINK_CB(in_skb).pid, MSG_DONTWAIT);
 236         if (err > 0)
 237                 err = 0;
 238
 239 out:
 240         if (sk) {
 241                 if (sk->sk_state == TCP_TIME_WAIT)
 242                         tcp_tw_put((struct tcp_tw_bucket*)sk);
 243                 else
 244                         sock_put(sk);
 245         }
 246         return err;
 247 }
 248
 249 static int bitstring_match(const u32 *a1, const u32 *a2, int bits)
 250 {
 251         int words = bits >> 5;
 252
 253         bits &= 0x1f;
 254
 255         if (words) {
 256                 if (memcmp(a1, a2, words << 2))
 257                         return 0;
 258         }
 259         if (bits) {
 260                 __u32 w1, w2;
 261                 __u32 mask;
 262
 263                 w1 = a1[words];
 264                 w2 = a2[words];
 265
 266                 mask = htonl((0xffffffff) << (32 - bits));
 267
 268                 if ((w1 ^ w2) & mask)
 269                         return 0;
 270         }
 271
 272         return 1;
 273 }
 274
 275
 276 static int tcpdiag_bc_run(const void *bc, int len,
 277                           const struct tcpdiag_entry *entry)
 278 {
 279         while (len > 0) {
 280                 int yes = 1;
 281                 const struct tcpdiag_bc_op *op = bc;
 282
 283                 switch (op->code) {
 284                 case TCPDIAG_BC_NOP:
 285                         break;
 286                 case TCPDIAG_BC_JMP:
 287                         yes = 0;
 288                         break;
 289                 case TCPDIAG_BC_S_GE:
 290                         yes = entry->sport >= op[1].no;
 291                         break;
 292                 case TCPDIAG_BC_S_LE:
 293                         yes = entry->dport <= op[1].no;
 294                         break;
 295                 case TCPDIAG_BC_D_GE:
 296                         yes = entry->dport >= op[1].no;
 297                         break;
 298                 case TCPDIAG_BC_D_LE:
 299                         yes = entry->dport <= op[1].no;
 300                         break;
 301                 case TCPDIAG_BC_AUTO:
 302                         yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
 303                         break;
 304                 case TCPDIAG_BC_S_COND:
 305                 case TCPDIAG_BC_D_COND:
 306                 {
 307                         struct tcpdiag_hostcond *cond = (struct tcpdiag_hostcond*)(op+1);
 308                         u32 *addr;
 309
 310                         if (cond->port != -1 &&
 311                             cond->port != (op->code == TCPDIAG_BC_S_COND ?
 312                                              entry->sport : entry->dport)) {
 313                                 yes = 0;
 314                                 break;
 315                         }
 316
 317                         if (cond->prefix_len == 0)
 318                                 break;
 319
 320                         if (op->code == TCPDIAG_BC_S_COND)
 321                                 addr = entry->saddr;
 322                         else
 323                                 addr = entry->daddr;
 324
 325                         if (bitstring_match(addr, cond->addr, cond->prefix_len))
 326                                 break;
 327                         if (entry->family == AF_INET6 &&
 328                             cond->family == AF_INET) {
 329                                 if (addr[0] == 0 && addr[1] == 0 &&
 330                                     addr[2] == htonl(0xffff) &&
 331                                     bitstring_match(addr+3, cond->addr, cond->prefix_len))
 332                                         break;
 333                         }
 334                         yes = 0;
 335                         break;
 336                 }
 337                 }
 338
 339                 if (yes) {
 340                         len -= op->yes;
 341                         bc += op->yes;
 342                 } else {
 343                         len -= op->no;
 344                         bc += op->no;
 345                 }
 346         }
 347         return (len == 0);
 348 }
 349
 350 static int valid_cc(const void *bc, int len, int cc)
 351 {
 352         while (len >= 0) {
 353                 const struct tcpdiag_bc_op *op = bc;
 354
 355                 if (cc > len)
 356                         return 0;
 357                 if (cc == len)
 358                         return 1;
 359                 if (op->yes < 4)
 360                         return 0;
 361                 len -= op->yes;
 362                 bc  += op->yes;
 363         }
 364         return 0;
 365 }
 366
 367 static int tcpdiag_bc_audit(const void *bytecode, int bytecode_len)
 368 {
 369         const unsigned char *bc = bytecode;
 370         int  len = bytecode_len;
 371
 372         while (len > 0) {
 373                 struct tcpdiag_bc_op *op = (struct tcpdiag_bc_op*)bc;
 374
 375 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
 376                 switch (op->code) {
 377                 case TCPDIAG_BC_AUTO:
 378                 case TCPDIAG_BC_S_COND:
 379                 case TCPDIAG_BC_D_COND:
 380                 case TCPDIAG_BC_S_GE:
 381                 case TCPDIAG_BC_S_LE:
 382                 case TCPDIAG_BC_D_GE:
 383                 case TCPDIAG_BC_D_LE:
 384                         if (op->yes < 4 || op->yes > len+4)
 385                                 return -EINVAL;
 386                 case TCPDIAG_BC_JMP:
 387                         if (op->no < 4 || op->no > len+4)
 388                                 return -EINVAL;
 389                         if (op->no < len &&
 390                             !valid_cc(bytecode, bytecode_len, len-op->no))
 391                                 return -EINVAL;
 392                         break;
 393                 case TCPDIAG_BC_NOP:
 394                         if (op->yes < 4 || op->yes > len+4)
 395                                 return -EINVAL;
 396                         break;
 397                 default:
 398                         return -EINVAL;
 399                 }
 400                 bc += op->yes;
 401                 len -= op->yes;
 402         }
 403         return len == 0 ? 0 : -EINVAL;
 404 }
 405
 406 static int tcpdiag_dump_sock(struct sk_buff *skb, struct sock *sk,
 407                              struct netlink_callback *cb)
 408 {
 409         struct tcpdiagreq *r = NLMSG_DATA(cb->nlh);
 410
 411         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
 412                 struct tcpdiag_entry entry;
 413                 struct rtattr *bc = (struct rtattr *)(r + 1);
 414                 struct inet_sock *inet = inet_sk(sk);
 415
 416                 entry.family = sk->sk_family;
 417 #ifdef CONFIG_IP_TCPDIAG_IPV6
 418                 if (entry.family == AF_INET6) {
 419                         struct ipv6_pinfo *np = inet6_sk(sk);
 420
 421                         entry.saddr = np->rcv_saddr.s6_addr32;
 422                         entry.daddr = np->daddr.s6_addr32;
 423                 } else
 424 #endif
 425                 {
 426                         entry.saddr = &inet->rcv_saddr;
 427                         entry.daddr = &inet->daddr;
 428                 }
 429                 entry.sport = inet->num;
 430                 entry.dport = ntohs(inet->dport);
 431                 entry.userlocks = sk->sk_userlocks;
 432
 433                 if (!tcpdiag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
 434                         return 0;
 435         }
 436
 437         return tcpdiag_fill(skb, sk, r->tcpdiag_ext, NETLINK_CB(cb->skb).pid,
 438                             cb->nlh->nlmsg_seq, NLM_F_MULTI);
 439 }
 440
 441 static int tcpdiag_fill_req(struct sk_buff *skb, struct sock *sk,
 442                             struct request_sock *req,
 443                             u32 pid, u32 seq)
 444 {
 445         const struct inet_request_sock *ireq = inet_rsk(req);
 446         struct inet_sock *inet = inet_sk(sk);
 447         unsigned char *b = skb->tail;
 448         struct tcpdiagmsg *r;
 449         struct nlmsghdr *nlh;
 450         long tmo;
 451
 452         nlh = NLMSG_PUT(skb, pid, seq, TCPDIAG_GETSOCK, sizeof(*r));
 453         nlh->nlmsg_flags = NLM_F_MULTI;
 454         r = NLMSG_DATA(nlh);
 455
 456         r->tcpdiag_family = sk->sk_family;
 457         r->tcpdiag_state = TCP_SYN_RECV;
 458         r->tcpdiag_timer = 1;
 459         r->tcpdiag_retrans = req->retrans;
 460
 461         r->id.tcpdiag_if = sk->sk_bound_dev_if;
 462         r->id.tcpdiag_cookie[0] = (u32)(unsigned long)req;
 463         r->id.tcpdiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
 464
 465         tmo = req->expires - jiffies;
 466         if (tmo < 0)
 467                 tmo = 0;
 468
 469         r->id.tcpdiag_sport = inet->sport;
 470         r->id.tcpdiag_dport = ireq->rmt_port;
 471         r->id.tcpdiag_src[0] = ireq->loc_addr;
 472         r->id.tcpdiag_dst[0] = ireq->rmt_addr;
 473         r->tcpdiag_expires = jiffies_to_msecs(tmo),
 474         r->tcpdiag_rqueue = 0;
 475         r->tcpdiag_wqueue = 0;
 476         r->tcpdiag_uid = sock_i_uid(sk);
 477         r->tcpdiag_inode = 0;
 478 #ifdef CONFIG_IP_TCPDIAG_IPV6
 479         if (r->tcpdiag_family == AF_INET6) {
 480                 ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src,
 481                                &tcp6_rsk(req)->loc_addr);
 482                 ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst,
 483                                &tcp6_rsk(req)->rmt_addr);
 484         }
 485 #endif
 486         nlh->nlmsg_len = skb->tail - b;
 487
 488         return skb->len;
 489
 490 nlmsg_failure:
 491         skb_trim(skb, b - skb->data);
 492         return -1;
 493 }
 494
 495 static int tcpdiag_dump_reqs(struct sk_buff *skb, struct sock *sk,
 496                              struct netlink_callback *cb)
 497 {
 498         struct tcpdiag_entry entry;
 499         struct tcpdiagreq *r = NLMSG_DATA(cb->nlh);
 500         struct tcp_sock *tp = tcp_sk(sk);
 501         struct listen_sock *lopt;
 502         struct rtattr *bc = NULL;
 503         struct inet_sock *inet = inet_sk(sk);
 504         int j, s_j;
 505         int reqnum, s_reqnum;
 506         int err = 0;
 507
 508         s_j = cb->args[3];
 509         s_reqnum = cb->args[4];
 510
 511         if (s_j > 0)
 512                 s_j--;
 513
 514         entry.family = sk->sk_family;
 515
 516         read_lock_bh(&tp->accept_queue.syn_wait_lock);
 517
 518         lopt = tp->accept_queue.listen_opt;
 519         if (!lopt || !lopt->qlen)
 520                 goto out;
 521
 522         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
 523                 bc = (struct rtattr *)(r + 1);
 524                 entry.sport = inet->num;
 525                 entry.userlocks = sk->sk_userlocks;
 526         }
 527
 528         for (j = s_j; j < TCP_SYNQ_HSIZE; j++) {
 529                 struct request_sock *req, *head = lopt->syn_table[j];
 530
 531                 reqnum = 0;
 532                 for (req = head; req; reqnum++, req = req->dl_next) {
 533                         struct inet_request_sock *ireq = inet_rsk(req);
 534
 535                         if (reqnum < s_reqnum)
 536                                 continue;
 537                         if (r->id.tcpdiag_dport != ireq->rmt_port &&
 538                             r->id.tcpdiag_dport)
 539                                 continue;
 540
 541                         if (bc) {
 542                                 entry.saddr =
 543 #ifdef CONFIG_IP_TCPDIAG_IPV6
 544                                         (entry.family == AF_INET6) ?
 545                                         tcp6_rsk(req)->loc_addr.s6_addr32 :
 546 #endif
 547                                         &ireq->loc_addr;
 548                                 entry.daddr =
 549 #ifdef CONFIG_IP_TCPDIAG_IPV6
 550                                         (entry.family == AF_INET6) ?
 551                                         tcp6_rsk(req)->rmt_addr.s6_addr32 :
 552 #endif
 553                                         &ireq->rmt_addr;
 554                                 entry.dport = ntohs(ireq->rmt_port);
 555
 556                                 if (!tcpdiag_bc_run(RTA_DATA(bc),
 557                                                     RTA_PAYLOAD(bc), &entry))
 558                                         continue;
 559                         }
 560
 561                         err = tcpdiag_fill_req(skb, sk, req,
 562                                                NETLINK_CB(cb->skb).pid,
 563                                                cb->nlh->nlmsg_seq);
 564                         if (err < 0) {
 565                                 cb->args[3] = j + 1;
 566                                 cb->args[4] = reqnum;
 567                                 goto out;
 568                         }
 569                 }
 570
 571                 s_reqnum = 0;
 572         }
 573
 574 out:
 575         read_unlock_bh(&tp->accept_queue.syn_wait_lock);
 576
 577         return err;
 578 }
 579
 580 static int tcpdiag_dump(struct sk_buff *skb, struct netlink_callback *cb)
 581 {
 582         int i, num;
 583         int s_i, s_num;
 584         struct tcpdiagreq *r = NLMSG_DATA(cb->nlh);
 585
 586         s_i = cb->args[1];
 587         s_num = num = cb->args[2];
 588
 589         if (cb->args[0] == 0) {
 590                 if (!(r->tcpdiag_states&(TCPF_LISTEN|TCPF_SYN_RECV)))
 591                         goto skip_listen_ht;
 592                 tcp_listen_lock();
 593                 for (i = s_i; i < TCP_LHTABLE_SIZE; i++) {
 594                         struct sock *sk;
 595                         struct hlist_node *node;
 596
 597                         num = 0;
 598                         sk_for_each(sk, node, &tcp_listening_hash[i]) {
 599                                 struct inet_sock *inet = inet_sk(sk);
 600
 601                                 if (num < s_num) {
 602                                         num++;
 603                                         continue;
 604                                 }
 605
 606                                 if (r->id.tcpdiag_sport != inet->sport &&
 607                                     r->id.tcpdiag_sport)
 608                                         goto next_listen;
 609
 610                                 if (!(r->tcpdiag_states&TCPF_LISTEN) ||
 611                                     r->id.tcpdiag_dport ||
 612                                     cb->args[3] > 0)
 613                                         goto syn_recv;
 614
 615                                 if (tcpdiag_dump_sock(skb, sk, cb) < 0) {
 616                                         tcp_listen_unlock();
 617                                         goto done;
 618                                 }
 619
 620 syn_recv:
 621                                 if (!(r->tcpdiag_states&TCPF_SYN_RECV))
 622                                         goto next_listen;
 623
 624                                 if (tcpdiag_dump_reqs(skb, sk, cb) < 0) {
 625                                         tcp_listen_unlock();
 626                                         goto done;
 627                                 }
 628
 629 next_listen:
 630                                 cb->args[3] = 0;
 631                                 cb->args[4] = 0;
 632                                 ++num;
 633                         }
 634
 635                         s_num = 0;
 636                         cb->args[3] = 0;
 637                         cb->args[4] = 0;
 638                 }
 639                 tcp_listen_unlock();
 640 skip_listen_ht:
 641                 cb->args[0] = 1;
 642                 s_i = num = s_num = 0;
 643         }
 644
 645         if (!(r->tcpdiag_states&~(TCPF_LISTEN|TCPF_SYN_RECV)))
 646                 return skb->len;
 647
 648         for (i = s_i; i < tcp_ehash_size; i++) {
 649                 struct tcp_ehash_bucket *head = &tcp_ehash[i];
 650                 struct sock *sk;
 651                 struct hlist_node *node;
 652
 653                 if (i > s_i)
 654                         s_num = 0;
 655
 656                 read_lock_bh(&head->lock);
 657
 658                 num = 0;
 659                 sk_for_each(sk, node, &head->chain) {
 660                         struct inet_sock *inet = inet_sk(sk);
 661
 662                         if (num < s_num)
 663                                 goto next_normal;
 664                         if (!(r->tcpdiag_states & (1 << sk->sk_state)))
 665                                 goto next_normal;
 666                         if (r->id.tcpdiag_sport != inet->sport &&
 667                             r->id.tcpdiag_sport)
 668                                 goto next_normal;
 669                         if (r->id.tcpdiag_dport != inet->dport && r->id.tcpdiag_dport)
 670                                 goto next_normal;
 671                         if (tcpdiag_dump_sock(skb, sk, cb) < 0) {
 672                                 read_unlock_bh(&head->lock);
 673                                 goto done;
 674                         }
 675 next_normal:
 676                         ++num;
 677                 }
 678
 679                 if (r->tcpdiag_states&TCPF_TIME_WAIT) {
 680                         sk_for_each(sk, node,
 681                                     &tcp_ehash[i + tcp_ehash_size].chain) {
 682                                 struct inet_sock *inet = inet_sk(sk);
 683
 684                                 if (num < s_num)
 685                                         goto next_dying;
 686                                 if (r->id.tcpdiag_sport != inet->sport &&
 687                                     r->id.tcpdiag_sport)
 688                                         goto next_dying;
 689                                 if (r->id.tcpdiag_dport != inet->dport &&
 690                                     r->id.tcpdiag_dport)
 691                                         goto next_dying;
 692                                 if (tcpdiag_dump_sock(skb, sk, cb) < 0) {
 693                                         read_unlock_bh(&head->lock);
 694                                         goto done;
 695                                 }
 696 next_dying:
 697                                 ++num;
 698                         }
 699                 }
 700                 read_unlock_bh(&head->lock);
 701         }
 702
 703 done:
 704         cb->args[1] = i;
 705         cb->args[2] = num;
 706         return skb->len;
 707 }
 708
 709 static int tcpdiag_dump_done(struct netlink_callback *cb)
 710 {
 711         return 0;
 712 }
 713
 714
 715 static __inline__ int
 716 tcpdiag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
 717 {
 718         if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
 719                 return 0;
 720
 721         if (nlh->nlmsg_type != TCPDIAG_GETSOCK)
 722                 goto err_inval;
 723
 724         if (NLMSG_LENGTH(sizeof(struct tcpdiagreq)) > skb->len)
 725                 goto err_inval;
 726
 727         if (nlh->nlmsg_flags&NLM_F_DUMP) {
 728                 if (nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(struct tcpdiagreq))) {
 729                         struct rtattr *rta = (struct rtattr*)(NLMSG_DATA(nlh) + sizeof(struct tcpdiagreq));
 730                         if (rta->rta_type != TCPDIAG_REQ_BYTECODE ||
 731                             rta->rta_len < 8 ||
 732                             rta->rta_len > nlh->nlmsg_len - NLMSG_SPACE(sizeof(struct tcpdiagreq)))
 733                                 goto err_inval;
 734                         if (tcpdiag_bc_audit(RTA_DATA(rta), RTA_PAYLOAD(rta)))
 735                                 goto err_inval;
 736                 }
 737                 return netlink_dump_start(tcpnl, skb, nlh,
 738                                           tcpdiag_dump,
 739                                           tcpdiag_dump_done);
 740         } else {
 741                 return tcpdiag_get_exact(skb, nlh);
 742         }
 743
 744 err_inval:
 745         return -EINVAL;
 746 }
 747
 748
 749 static inline void tcpdiag_rcv_skb(struct sk_buff *skb)
 750 {
 751         int err;
 752         struct nlmsghdr * nlh;
 753
 754         if (skb->len >= NLMSG_SPACE(0)) {
 755                 nlh = (struct nlmsghdr *)skb->data;
 756                 if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len)
 757                         return;
 758                 err = tcpdiag_rcv_msg(skb, nlh);
 759                 if (err || nlh->nlmsg_flags & NLM_F_ACK)
 760                         netlink_ack(skb, nlh, err);
 761         }
 762 }
 763
 764 static void tcpdiag_rcv(struct sock *sk, int len)
 765 {
 766         struct sk_buff *skb;
 767         unsigned int qlen = skb_queue_len(&sk->sk_receive_queue);
 768
 769         while (qlen-- && (skb = skb_dequeue(&sk->sk_receive_queue))) {
 770                 tcpdiag_rcv_skb(skb);
 771                 kfree_skb(skb);
 772         }
 773 }
 774
 775 static int __init tcpdiag_init(void)
 776 {
 777         tcpnl = netlink_kernel_create(NETLINK_TCPDIAG, tcpdiag_rcv);
 778         if (tcpnl == NULL)
 779                 return -ENOMEM;
 780         return 0;
 781 }
 782
 783 static void __exit tcpdiag_exit(void)
 784 {
 785         sock_release(tcpnl->sk_socket);
 786 }
 787
 788 module_init(tcpdiag_init);
 789 module_exit(tcpdiag_exit);
 790 MODULE_LICENSE("GPL");