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 #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");