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 #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
  49 extern struct inet_hashinfo dccp_hashinfo;
  50 #endif
  51
  52 static int tcpdiag_fill(struct sk_buff *skb, struct sock *sk,
  53                         int ext, u32 pid, u32 seq, u16 nlmsg_flags,
  54                         const struct nlmsghdr *unlh)
  55 {
  56         const struct inet_sock *inet = inet_sk(sk);
  57         const struct inet_connection_sock *icsk = inet_csk(sk);
  58         struct tcpdiagmsg *r;
  59         struct nlmsghdr  *nlh;
  60         struct tcp_info  *info = NULL;
  61         struct tcpdiag_meminfo  *minfo = NULL;
  62         unsigned char    *b = skb->tail;
  63
  64         nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
  65         nlh->nlmsg_flags = nlmsg_flags;
  66         r = NLMSG_DATA(nlh);
  67         if (sk->sk_state != TCP_TIME_WAIT) {
  68                 if (ext & (1<<(TCPDIAG_MEMINFO-1)))
  69                         minfo = TCPDIAG_PUT(skb, TCPDIAG_MEMINFO, sizeof(*minfo));
  70                 if (ext & (1<<(TCPDIAG_INFO-1)))
  71                         info = TCPDIAG_PUT(skb, TCPDIAG_INFO, sizeof(*info));
  72
  73                 if ((ext & (1 << (TCPDIAG_CONG - 1))) && icsk->icsk_ca_ops) {
  74                         size_t len = strlen(icsk->icsk_ca_ops->name);
  75                         strcpy(TCPDIAG_PUT(skb, TCPDIAG_CONG, len+1),
  76                                icsk->icsk_ca_ops->name);
  77                 }
  78         }
  79         r->tcpdiag_family = sk->sk_family;
  80         r->tcpdiag_state = sk->sk_state;
  81         r->tcpdiag_timer = 0;
  82         r->tcpdiag_retrans = 0;
  83
  84         r->id.tcpdiag_if = sk->sk_bound_dev_if;
  85         r->id.tcpdiag_cookie[0] = (u32)(unsigned long)sk;
  86         r->id.tcpdiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
  87
  88         if (r->tcpdiag_state == TCP_TIME_WAIT) {
  89                 const struct inet_timewait_sock *tw = inet_twsk(sk);
  90                 long tmo = tw->tw_ttd - jiffies;
  91                 if (tmo < 0)
  92                         tmo = 0;
  93
  94                 r->id.tcpdiag_sport = tw->tw_sport;
  95                 r->id.tcpdiag_dport = tw->tw_dport;
  96                 r->id.tcpdiag_src[0] = tw->tw_rcv_saddr;
  97                 r->id.tcpdiag_dst[0] = tw->tw_daddr;
  98                 r->tcpdiag_state = tw->tw_substate;
  99                 r->tcpdiag_timer = 3;
 100                 r->tcpdiag_expires = (tmo*1000+HZ-1)/HZ;
 101                 r->tcpdiag_rqueue = 0;
 102                 r->tcpdiag_wqueue = 0;
 103                 r->tcpdiag_uid = 0;
 104                 r->tcpdiag_inode = 0;
 105 #ifdef CONFIG_IP_TCPDIAG_IPV6
 106                 if (r->tcpdiag_family == AF_INET6) {
 107                         const struct tcp6_timewait_sock *tcp6tw = tcp6_twsk(sk);
 108
 109                         ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src,
 110                                        &tcp6tw->tw_v6_rcv_saddr);
 111                         ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst,
 112                                        &tcp6tw->tw_v6_daddr);
 113                 }
 114 #endif
 115                 nlh->nlmsg_len = skb->tail - b;
 116                 return skb->len;
 117         }
 118
 119         r->id.tcpdiag_sport = inet->sport;
 120         r->id.tcpdiag_dport = inet->dport;
 121         r->id.tcpdiag_src[0] = inet->rcv_saddr;
 122         r->id.tcpdiag_dst[0] = inet->daddr;
 123
 124 #ifdef CONFIG_IP_TCPDIAG_IPV6
 125         if (r->tcpdiag_family == AF_INET6) {
 126                 struct ipv6_pinfo *np = inet6_sk(sk);
 127
 128                 ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src,
 129                                &np->rcv_saddr);
 130                 ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst,
 131                                &np->daddr);
 132         }
 133 #endif
 134
 135 #define EXPIRES_IN_MS(tmo)  ((tmo-jiffies)*1000+HZ-1)/HZ
 136
 137         if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
 138                 r->tcpdiag_timer = 1;
 139                 r->tcpdiag_retrans = icsk->icsk_retransmits;
 140                 r->tcpdiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
 141         } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
 142                 r->tcpdiag_timer = 4;
 143                 r->tcpdiag_retrans = icsk->icsk_probes_out;
 144                 r->tcpdiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
 145         } else if (timer_pending(&sk->sk_timer)) {
 146                 r->tcpdiag_timer = 2;
 147                 r->tcpdiag_retrans = icsk->icsk_probes_out;
 148                 r->tcpdiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
 149         } else {
 150                 r->tcpdiag_timer = 0;
 151                 r->tcpdiag_expires = 0;
 152         }
 153 #undef EXPIRES_IN_MS
 154         /*
 155          * Ahem... for now we'll have some knowledge about TCP -acme
 156          * But this is just one of two small exceptions, both in this
 157          * function, so lets close our eyes for some 15 lines or so... 8)
 158          * -acme
 159          */
 160         if (sk->sk_protocol == IPPROTO_TCP) {
 161                 const struct tcp_sock *tp = tcp_sk(sk);
 162
 163                 r->tcpdiag_rqueue = tp->rcv_nxt - tp->copied_seq;
 164                 r->tcpdiag_wqueue = tp->write_seq - tp->snd_una;
 165         } else
 166                 r->tcpdiag_rqueue = r->tcpdiag_wqueue = 0;
 167
 168         r->tcpdiag_uid = sock_i_uid(sk);
 169         r->tcpdiag_inode = sock_i_ino(sk);
 170
 171         if (minfo) {
 172                 minfo->tcpdiag_rmem = atomic_read(&sk->sk_rmem_alloc);
 173                 minfo->tcpdiag_wmem = sk->sk_wmem_queued;
 174                 minfo->tcpdiag_fmem = sk->sk_forward_alloc;
 175                 minfo->tcpdiag_tmem = atomic_read(&sk->sk_wmem_alloc);
 176         }
 177
 178         /* Ahem... for now we'll have some knowledge about TCP -acme */
 179         if (info) {
 180                 if (sk->sk_protocol == IPPROTO_TCP)
 181                         tcp_get_info(sk, info);
 182                 else
 183                         memset(info, 0, sizeof(*info));
 184         }
 185
 186         if (sk->sk_state < TCP_TIME_WAIT &&
 187             icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
 188                 icsk->icsk_ca_ops->get_info(sk, ext, skb);
 189
 190         nlh->nlmsg_len = skb->tail - b;
 191         return skb->len;
 192
 193 rtattr_failure:
 194 nlmsg_failure:
 195         skb_trim(skb, b - skb->data);
 196         return -1;
 197 }
 198
 199 #ifdef CONFIG_IP_TCPDIAG_IPV6
 200 extern struct sock *tcp_v6_lookup(struct in6_addr *saddr, u16 sport,
 201                                   struct in6_addr *daddr, u16 dport,
 202                                   int dif);
 203 #else
 204 static inline struct sock *tcp_v6_lookup(struct in6_addr *saddr, u16 sport,
 205                                          struct in6_addr *daddr, u16 dport,
 206                                          int dif)
 207 {
 208         return NULL;
 209 }
 210 #endif
 211
 212 static int tcpdiag_get_exact(struct sk_buff *in_skb, const struct nlmsghdr *nlh)
 213 {
 214         int err;
 215         struct sock *sk;
 216         struct tcpdiagreq *req = NLMSG_DATA(nlh);
 217         struct sk_buff *rep;
 218         struct inet_hashinfo *hashinfo = &tcp_hashinfo;
 219 #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
 220         if (nlh->nlmsg_type == DCCPDIAG_GETSOCK)
 221                 hashinfo = &dccp_hashinfo;
 222 #endif
 223         if (req->tcpdiag_family == AF_INET) {
 224                 sk = inet_lookup(hashinfo, req->id.tcpdiag_dst[0],
 225                                  req->id.tcpdiag_dport, req->id.tcpdiag_src[0],
 226                                  req->id.tcpdiag_sport, req->id.tcpdiag_if);
 227         }
 228 #ifdef CONFIG_IP_TCPDIAG_IPV6
 229         else if (req->tcpdiag_family == AF_INET6) {
 230                 sk = tcp_v6_lookup((struct in6_addr*)req->id.tcpdiag_dst, req->id.tcpdiag_dport,
 231                                    (struct in6_addr*)req->id.tcpdiag_src, req->id.tcpdiag_sport,
 232                                    req->id.tcpdiag_if);
 233         }
 234 #endif
 235         else {
 236                 return -EINVAL;
 237         }
 238
 239         if (sk == NULL)
 240                 return -ENOENT;
 241
 242         err = -ESTALE;
 243         if ((req->id.tcpdiag_cookie[0] != TCPDIAG_NOCOOKIE ||
 244              req->id.tcpdiag_cookie[1] != TCPDIAG_NOCOOKIE) &&
 245             ((u32)(unsigned long)sk != req->id.tcpdiag_cookie[0] ||
 246              (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.tcpdiag_cookie[1]))
 247                 goto out;
 248
 249         err = -ENOMEM;
 250         rep = alloc_skb(NLMSG_SPACE(sizeof(struct tcpdiagmsg)+
 251                                     sizeof(struct tcpdiag_meminfo)+
 252                                     sizeof(struct tcp_info)+64), GFP_KERNEL);
 253         if (!rep)
 254                 goto out;
 255
 256         if (tcpdiag_fill(rep, sk, req->tcpdiag_ext,
 257                          NETLINK_CB(in_skb).pid,
 258                          nlh->nlmsg_seq, 0, nlh) <= 0)
 259                 BUG();
 260
 261         err = netlink_unicast(tcpnl, rep, NETLINK_CB(in_skb).pid, MSG_DONTWAIT);
 262         if (err > 0)
 263                 err = 0;
 264
 265 out:
 266         if (sk) {
 267                 if (sk->sk_state == TCP_TIME_WAIT)
 268                         inet_twsk_put((struct inet_timewait_sock *)sk);
 269                 else
 270                         sock_put(sk);
 271         }
 272         return err;
 273 }
 274
 275 static int bitstring_match(const u32 *a1, const u32 *a2, int bits)
 276 {
 277         int words = bits >> 5;
 278
 279         bits &= 0x1f;
 280
 281         if (words) {
 282                 if (memcmp(a1, a2, words << 2))
 283                         return 0;
 284         }
 285         if (bits) {
 286                 __u32 w1, w2;
 287                 __u32 mask;
 288
 289                 w1 = a1[words];
 290                 w2 = a2[words];
 291
 292                 mask = htonl((0xffffffff) << (32 - bits));
 293
 294                 if ((w1 ^ w2) & mask)
 295                         return 0;
 296         }
 297
 298         return 1;
 299 }
 300
 301
 302 static int tcpdiag_bc_run(const void *bc, int len,
 303                           const struct tcpdiag_entry *entry)
 304 {
 305         while (len > 0) {
 306                 int yes = 1;
 307                 const struct tcpdiag_bc_op *op = bc;
 308
 309                 switch (op->code) {
 310                 case TCPDIAG_BC_NOP:
 311                         break;
 312                 case TCPDIAG_BC_JMP:
 313                         yes = 0;
 314                         break;
 315                 case TCPDIAG_BC_S_GE:
 316                         yes = entry->sport >= op[1].no;
 317                         break;
 318                 case TCPDIAG_BC_S_LE:
 319                         yes = entry->dport <= op[1].no;
 320                         break;
 321                 case TCPDIAG_BC_D_GE:
 322                         yes = entry->dport >= op[1].no;
 323                         break;
 324                 case TCPDIAG_BC_D_LE:
 325                         yes = entry->dport <= op[1].no;
 326                         break;
 327                 case TCPDIAG_BC_AUTO:
 328                         yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
 329                         break;
 330                 case TCPDIAG_BC_S_COND:
 331                 case TCPDIAG_BC_D_COND:
 332                 {
 333                         struct tcpdiag_hostcond *cond = (struct tcpdiag_hostcond*)(op+1);
 334                         u32 *addr;
 335
 336                         if (cond->port != -1 &&
 337                             cond->port != (op->code == TCPDIAG_BC_S_COND ?
 338                                              entry->sport : entry->dport)) {
 339                                 yes = 0;
 340                                 break;
 341                         }
 342
 343                         if (cond->prefix_len == 0)
 344                                 break;
 345
 346                         if (op->code == TCPDIAG_BC_S_COND)
 347                                 addr = entry->saddr;
 348                         else
 349                                 addr = entry->daddr;
 350
 351                         if (bitstring_match(addr, cond->addr, cond->prefix_len))
 352                                 break;
 353                         if (entry->family == AF_INET6 &&
 354                             cond->family == AF_INET) {
 355                                 if (addr[0] == 0 && addr[1] == 0 &&
 356                                     addr[2] == htonl(0xffff) &&
 357                                     bitstring_match(addr+3, cond->addr, cond->prefix_len))
 358                                         break;
 359                         }
 360                         yes = 0;
 361                         break;
 362                 }
 363                 }
 364
 365                 if (yes) {
 366                         len -= op->yes;
 367                         bc += op->yes;
 368                 } else {
 369                         len -= op->no;
 370                         bc += op->no;
 371                 }
 372         }
 373         return (len == 0);
 374 }
 375
 376 static int valid_cc(const void *bc, int len, int cc)
 377 {
 378         while (len >= 0) {
 379                 const struct tcpdiag_bc_op *op = bc;
 380
 381                 if (cc > len)
 382                         return 0;
 383                 if (cc == len)
 384                         return 1;
 385                 if (op->yes < 4)
 386                         return 0;
 387                 len -= op->yes;
 388                 bc  += op->yes;
 389         }
 390         return 0;
 391 }
 392
 393 static int tcpdiag_bc_audit(const void *bytecode, int bytecode_len)
 394 {
 395         const unsigned char *bc = bytecode;
 396         int  len = bytecode_len;
 397
 398         while (len > 0) {
 399                 struct tcpdiag_bc_op *op = (struct tcpdiag_bc_op*)bc;
 400
 401 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
 402                 switch (op->code) {
 403                 case TCPDIAG_BC_AUTO:
 404                 case TCPDIAG_BC_S_COND:
 405                 case TCPDIAG_BC_D_COND:
 406                 case TCPDIAG_BC_S_GE:
 407                 case TCPDIAG_BC_S_LE:
 408                 case TCPDIAG_BC_D_GE:
 409                 case TCPDIAG_BC_D_LE:
 410                         if (op->yes < 4 || op->yes > len+4)
 411                                 return -EINVAL;
 412                 case TCPDIAG_BC_JMP:
 413                         if (op->no < 4 || op->no > len+4)
 414                                 return -EINVAL;
 415                         if (op->no < len &&
 416                             !valid_cc(bytecode, bytecode_len, len-op->no))
 417                                 return -EINVAL;
 418                         break;
 419                 case TCPDIAG_BC_NOP:
 420                         if (op->yes < 4 || op->yes > len+4)
 421                                 return -EINVAL;
 422                         break;
 423                 default:
 424                         return -EINVAL;
 425                 }
 426                 bc += op->yes;
 427                 len -= op->yes;
 428         }
 429         return len == 0 ? 0 : -EINVAL;
 430 }
 431
 432 static int tcpdiag_dump_sock(struct sk_buff *skb, struct sock *sk,
 433                              struct netlink_callback *cb)
 434 {
 435         struct tcpdiagreq *r = NLMSG_DATA(cb->nlh);
 436
 437         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
 438                 struct tcpdiag_entry entry;
 439                 struct rtattr *bc = (struct rtattr *)(r + 1);
 440                 struct inet_sock *inet = inet_sk(sk);
 441
 442                 entry.family = sk->sk_family;
 443 #ifdef CONFIG_IP_TCPDIAG_IPV6
 444                 if (entry.family == AF_INET6) {
 445                         struct ipv6_pinfo *np = inet6_sk(sk);
 446
 447                         entry.saddr = np->rcv_saddr.s6_addr32;
 448                         entry.daddr = np->daddr.s6_addr32;
 449                 } else
 450 #endif
 451                 {
 452                         entry.saddr = &inet->rcv_saddr;
 453                         entry.daddr = &inet->daddr;
 454                 }
 455                 entry.sport = inet->num;
 456                 entry.dport = ntohs(inet->dport);
 457                 entry.userlocks = sk->sk_userlocks;
 458
 459                 if (!tcpdiag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
 460                         return 0;
 461         }
 462
 463         return tcpdiag_fill(skb, sk, r->tcpdiag_ext, NETLINK_CB(cb->skb).pid,
 464                             cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
 465 }
 466
 467 static int tcpdiag_fill_req(struct sk_buff *skb, struct sock *sk,
 468                             struct request_sock *req,
 469                             u32 pid, u32 seq,
 470                             const struct nlmsghdr *unlh)
 471 {
 472         const struct inet_request_sock *ireq = inet_rsk(req);
 473         struct inet_sock *inet = inet_sk(sk);
 474         unsigned char *b = skb->tail;
 475         struct tcpdiagmsg *r;
 476         struct nlmsghdr *nlh;
 477         long tmo;
 478
 479         nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
 480         nlh->nlmsg_flags = NLM_F_MULTI;
 481         r = NLMSG_DATA(nlh);
 482
 483         r->tcpdiag_family = sk->sk_family;
 484         r->tcpdiag_state = TCP_SYN_RECV;
 485         r->tcpdiag_timer = 1;
 486         r->tcpdiag_retrans = req->retrans;
 487
 488         r->id.tcpdiag_if = sk->sk_bound_dev_if;
 489         r->id.tcpdiag_cookie[0] = (u32)(unsigned long)req;
 490         r->id.tcpdiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
 491
 492         tmo = req->expires - jiffies;
 493         if (tmo < 0)
 494                 tmo = 0;
 495
 496         r->id.tcpdiag_sport = inet->sport;
 497         r->id.tcpdiag_dport = ireq->rmt_port;
 498         r->id.tcpdiag_src[0] = ireq->loc_addr;
 499         r->id.tcpdiag_dst[0] = ireq->rmt_addr;
 500         r->tcpdiag_expires = jiffies_to_msecs(tmo),
 501         r->tcpdiag_rqueue = 0;
 502         r->tcpdiag_wqueue = 0;
 503         r->tcpdiag_uid = sock_i_uid(sk);
 504         r->tcpdiag_inode = 0;
 505 #ifdef CONFIG_IP_TCPDIAG_IPV6
 506         if (r->tcpdiag_family == AF_INET6) {
 507                 ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src,
 508                                &tcp6_rsk(req)->loc_addr);
 509                 ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst,
 510                                &tcp6_rsk(req)->rmt_addr);
 511         }
 512 #endif
 513         nlh->nlmsg_len = skb->tail - b;
 514
 515         return skb->len;
 516
 517 nlmsg_failure:
 518         skb_trim(skb, b - skb->data);
 519         return -1;
 520 }
 521
 522 static int tcpdiag_dump_reqs(struct sk_buff *skb, struct sock *sk,
 523                              struct netlink_callback *cb)
 524 {
 525         struct tcpdiag_entry entry;
 526         struct tcpdiagreq *r = NLMSG_DATA(cb->nlh);
 527         struct inet_connection_sock *icsk = inet_csk(sk);
 528         struct listen_sock *lopt;
 529         struct rtattr *bc = NULL;
 530         struct inet_sock *inet = inet_sk(sk);
 531         int j, s_j;
 532         int reqnum, s_reqnum;
 533         int err = 0;
 534
 535         s_j = cb->args[3];
 536         s_reqnum = cb->args[4];
 537
 538         if (s_j > 0)
 539                 s_j--;
 540
 541         entry.family = sk->sk_family;
 542
 543         read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 544
 545         lopt = icsk->icsk_accept_queue.listen_opt;
 546         if (!lopt || !lopt->qlen)
 547                 goto out;
 548
 549         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
 550                 bc = (struct rtattr *)(r + 1);
 551                 entry.sport = inet->num;
 552                 entry.userlocks = sk->sk_userlocks;
 553         }
 554
 555         for (j = s_j; j < lopt->nr_table_entries; j++) {
 556                 struct request_sock *req, *head = lopt->syn_table[j];
 557
 558                 reqnum = 0;
 559                 for (req = head; req; reqnum++, req = req->dl_next) {
 560                         struct inet_request_sock *ireq = inet_rsk(req);
 561
 562                         if (reqnum < s_reqnum)
 563                                 continue;
 564                         if (r->id.tcpdiag_dport != ireq->rmt_port &&
 565                             r->id.tcpdiag_dport)
 566                                 continue;
 567
 568                         if (bc) {
 569                                 entry.saddr =
 570 #ifdef CONFIG_IP_TCPDIAG_IPV6
 571                                         (entry.family == AF_INET6) ?
 572                                         tcp6_rsk(req)->loc_addr.s6_addr32 :
 573 #endif
 574                                         &ireq->loc_addr;
 575                                 entry.daddr =
 576 #ifdef CONFIG_IP_TCPDIAG_IPV6
 577                                         (entry.family == AF_INET6) ?
 578                                         tcp6_rsk(req)->rmt_addr.s6_addr32 :
 579 #endif
 580                                         &ireq->rmt_addr;
 581                                 entry.dport = ntohs(ireq->rmt_port);
 582
 583                                 if (!tcpdiag_bc_run(RTA_DATA(bc),
 584                                                     RTA_PAYLOAD(bc), &entry))
 585                                         continue;
 586                         }
 587
 588                         err = tcpdiag_fill_req(skb, sk, req,
 589                                                NETLINK_CB(cb->skb).pid,
 590                                                cb->nlh->nlmsg_seq, cb->nlh);
 591                         if (err < 0) {
 592                                 cb->args[3] = j + 1;
 593                                 cb->args[4] = reqnum;
 594                                 goto out;
 595                         }
 596                 }
 597
 598                 s_reqnum = 0;
 599         }
 600
 601 out:
 602         read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 603
 604         return err;
 605 }
 606
 607 static int tcpdiag_dump(struct sk_buff *skb, struct netlink_callback *cb)
 608 {
 609         int i, num;
 610         int s_i, s_num;
 611         struct tcpdiagreq *r = NLMSG_DATA(cb->nlh);
 612         struct inet_hashinfo *hashinfo;
 613
 614         s_i = cb->args[1];
 615         s_num = num = cb->args[2];
 616                 hashinfo = &tcp_hashinfo;
 617 #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
 618         if (cb->nlh->nlmsg_type == DCCPDIAG_GETSOCK)
 619                 hashinfo = &dccp_hashinfo;
 620 #endif
 621         if (cb->args[0] == 0) {
 622                 if (!(r->tcpdiag_states&(TCPF_LISTEN|TCPF_SYN_RECV)))
 623                         goto skip_listen_ht;
 624
 625                 inet_listen_lock(hashinfo);
 626                 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
 627                         struct sock *sk;
 628                         struct hlist_node *node;
 629
 630                         num = 0;
 631                         sk_for_each(sk, node, &hashinfo->listening_hash[i]) {
 632                                 struct inet_sock *inet = inet_sk(sk);
 633
 634                                 if (num < s_num) {
 635                                         num++;
 636                                         continue;
 637                                 }
 638
 639                                 if (r->id.tcpdiag_sport != inet->sport &&
 640                                     r->id.tcpdiag_sport)
 641                                         goto next_listen;
 642
 643                                 if (!(r->tcpdiag_states&TCPF_LISTEN) ||
 644                                     r->id.tcpdiag_dport ||
 645                                     cb->args[3] > 0)
 646                                         goto syn_recv;
 647
 648                                 if (tcpdiag_dump_sock(skb, sk, cb) < 0) {
 649                                         inet_listen_unlock(hashinfo);
 650                                         goto done;
 651                                 }
 652
 653 syn_recv:
 654                                 if (!(r->tcpdiag_states&TCPF_SYN_RECV))
 655                                         goto next_listen;
 656
 657                                 if (tcpdiag_dump_reqs(skb, sk, cb) < 0) {
 658                                         inet_listen_unlock(hashinfo);
 659                                         goto done;
 660                                 }
 661
 662 next_listen:
 663                                 cb->args[3] = 0;
 664                                 cb->args[4] = 0;
 665                                 ++num;
 666                         }
 667
 668                         s_num = 0;
 669                         cb->args[3] = 0;
 670                         cb->args[4] = 0;
 671                 }
 672                 inet_listen_unlock(hashinfo);
 673 skip_listen_ht:
 674                 cb->args[0] = 1;
 675                 s_i = num = s_num = 0;
 676         }
 677
 678         if (!(r->tcpdiag_states&~(TCPF_LISTEN|TCPF_SYN_RECV)))
 679                 return skb->len;
 680
 681         for (i = s_i; i < hashinfo->ehash_size; i++) {
 682                 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
 683                 struct sock *sk;
 684                 struct hlist_node *node;
 685
 686                 if (i > s_i)
 687                         s_num = 0;
 688
 689                 read_lock_bh(&head->lock);
 690
 691                 num = 0;
 692                 sk_for_each(sk, node, &head->chain) {
 693                         struct inet_sock *inet = inet_sk(sk);
 694
 695                         if (num < s_num)
 696                                 goto next_normal;
 697                         if (!(r->tcpdiag_states & (1 << sk->sk_state)))
 698                                 goto next_normal;
 699                         if (r->id.tcpdiag_sport != inet->sport &&
 700                             r->id.tcpdiag_sport)
 701                                 goto next_normal;
 702                         if (r->id.tcpdiag_dport != inet->dport && r->id.tcpdiag_dport)
 703                                 goto next_normal;
 704                         if (tcpdiag_dump_sock(skb, sk, cb) < 0) {
 705                                 read_unlock_bh(&head->lock);
 706                                 goto done;
 707                         }
 708 next_normal:
 709                         ++num;
 710                 }
 711
 712                 if (r->tcpdiag_states&TCPF_TIME_WAIT) {
 713                         sk_for_each(sk, node,
 714                                     &hashinfo->ehash[i + hashinfo->ehash_size].chain) {
 715                                 struct inet_sock *inet = inet_sk(sk);
 716
 717                                 if (num < s_num)
 718                                         goto next_dying;
 719                                 if (r->id.tcpdiag_sport != inet->sport &&
 720                                     r->id.tcpdiag_sport)
 721                                         goto next_dying;
 722                                 if (r->id.tcpdiag_dport != inet->dport &&
 723                                     r->id.tcpdiag_dport)
 724                                         goto next_dying;
 725                                 if (tcpdiag_dump_sock(skb, sk, cb) < 0) {
 726                                         read_unlock_bh(&head->lock);
 727                                         goto done;
 728                                 }
 729 next_dying:
 730                                 ++num;
 731                         }
 732                 }
 733                 read_unlock_bh(&head->lock);
 734         }
 735
 736 done:
 737         cb->args[1] = i;
 738         cb->args[2] = num;
 739         return skb->len;
 740 }
 741
 742 static int tcpdiag_dump_done(struct netlink_callback *cb)
 743 {
 744         return 0;
 745 }
 746
 747
 748 static __inline__ int
 749 tcpdiag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
 750 {
 751         if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
 752                 return 0;
 753
 754         if (nlh->nlmsg_type != TCPDIAG_GETSOCK
 755 #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
 756             && nlh->nlmsg_type != DCCPDIAG_GETSOCK
 757 #endif
 758            )
 759                 goto err_inval;
 760
 761         if (NLMSG_LENGTH(sizeof(struct tcpdiagreq)) > skb->len)
 762                 goto err_inval;
 763
 764         if (nlh->nlmsg_flags&NLM_F_DUMP) {
 765                 if (nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(struct tcpdiagreq))) {
 766                         struct rtattr *rta = (struct rtattr*)(NLMSG_DATA(nlh) + sizeof(struct tcpdiagreq));
 767                         if (rta->rta_type != TCPDIAG_REQ_BYTECODE ||
 768                             rta->rta_len < 8 ||
 769                             rta->rta_len > nlh->nlmsg_len - NLMSG_SPACE(sizeof(struct tcpdiagreq)))
 770                                 goto err_inval;
 771                         if (tcpdiag_bc_audit(RTA_DATA(rta), RTA_PAYLOAD(rta)))
 772                                 goto err_inval;
 773                 }
 774                 return netlink_dump_start(tcpnl, skb, nlh,
 775                                           tcpdiag_dump,
 776                                           tcpdiag_dump_done);
 777         } else {
 778                 return tcpdiag_get_exact(skb, nlh);
 779         }
 780
 781 err_inval:
 782         return -EINVAL;
 783 }
 784
 785
 786 static inline void tcpdiag_rcv_skb(struct sk_buff *skb)
 787 {
 788         int err;
 789         struct nlmsghdr * nlh;
 790
 791         if (skb->len >= NLMSG_SPACE(0)) {
 792                 nlh = (struct nlmsghdr *)skb->data;
 793                 if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len)
 794                         return;
 795                 err = tcpdiag_rcv_msg(skb, nlh);
 796                 if (err || nlh->nlmsg_flags & NLM_F_ACK)
 797                         netlink_ack(skb, nlh, err);
 798         }
 799 }
 800
 801 static void tcpdiag_rcv(struct sock *sk, int len)
 802 {
 803         struct sk_buff *skb;
 804         unsigned int qlen = skb_queue_len(&sk->sk_receive_queue);
 805
 806         while (qlen-- && (skb = skb_dequeue(&sk->sk_receive_queue))) {
 807                 tcpdiag_rcv_skb(skb);
 808                 kfree_skb(skb);
 809         }
 810 }
 811
 812 static int __init tcpdiag_init(void)
 813 {
 814         tcpnl = netlink_kernel_create(NETLINK_TCPDIAG, tcpdiag_rcv,
 815                                       THIS_MODULE);
 816         if (tcpnl == NULL)
 817                 return -ENOMEM;
 818         return 0;
 819 }
 820
 821 static void __exit tcpdiag_exit(void)
 822 {
 823         sock_release(tcpnl->sk_socket);
 824 }
 825
 826 module_init(tcpdiag_init);
 827 module_exit(tcpdiag_exit);
 828 MODULE_LICENSE("GPL");