net/ipv4/inet_diag.c

   1 /*
   2  * inet_diag.c  Module for monitoring INET transport protocols sockets.
   3  *
   4  * Version:     $Id: inet_diag.c,v 1.3 2002/02/01 22:01:04 davem Exp $
   5  *
   6  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
   7  *
   8  *      This program is free software; you can redistribute it and/or
   9  *      modify it under the terms of the GNU General Public License
  10  *      as published by the Free Software Foundation; either version
  11  *      2 of the License, or (at your option) any later version.
  12  */
  13
  14 #include <linux/config.h>
  15 #include <linux/module.h>
  16 #include <linux/types.h>
  17 #include <linux/fcntl.h>
  18 #include <linux/random.h>
  19 #include <linux/cache.h>
  20 #include <linux/init.h>
  21 #include <linux/time.h>
  22
  23 #include <net/icmp.h>
  24 #include <net/tcp.h>
  25 #include <net/ipv6.h>
  26 #include <net/inet_common.h>
  27 #include <net/inet_connection_sock.h>
  28 #include <net/inet_hashtables.h>
  29 #include <net/inet_timewait_sock.h>
  30 #include <net/inet6_hashtables.h>
  31
  32 #include <linux/inet.h>
  33 #include <linux/stddef.h>
  34
  35 #include <linux/inet_diag.h>
  36
  37 static const struct inet_diag_handler **inet_diag_table;
  38
  39 struct inet_diag_entry {
  40         u32 *saddr;
  41         u32 *daddr;
  42         u16 sport;
  43         u16 dport;
  44         u16 family;
  45         u16 userlocks;
  46 };
  47
  48 static struct sock *idiagnl;
  49
  50 #define INET_DIAG_PUT(skb, attrtype, attrlen) \
  51         RTA_DATA(__RTA_PUT(skb, attrtype, attrlen))
  52
  53 static int inet_diag_fill(struct sk_buff *skb, struct sock *sk,
  54                           int ext, u32 pid, u32 seq, u16 nlmsg_flags,
  55                           const struct nlmsghdr *unlh)
  56 {
  57         const struct inet_sock *inet = inet_sk(sk);
  58         const struct inet_connection_sock *icsk = inet_csk(sk);
  59         struct inet_diag_msg *r;
  60         struct nlmsghdr  *nlh;
  61         void *info = NULL;
  62         struct inet_diag_meminfo  *minfo = NULL;
  63         unsigned char    *b = skb->tail;
  64         const struct inet_diag_handler *handler;
  65
  66         handler = inet_diag_table[unlh->nlmsg_type];
  67         BUG_ON(handler == NULL);
  68
  69         nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
  70         nlh->nlmsg_flags = nlmsg_flags;
  71
  72         r = NLMSG_DATA(nlh);
  73         if (sk->sk_state != TCP_TIME_WAIT) {
  74                 if (ext & (1 << (INET_DIAG_MEMINFO - 1)))
  75                         minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO,
  76                                               sizeof(*minfo));
  77                 if (ext & (1 << (INET_DIAG_INFO - 1)))
  78                         info = INET_DIAG_PUT(skb, INET_DIAG_INFO,
  79                                            handler->idiag_info_size);
  80
  81                 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) {
  82                         size_t len = strlen(icsk->icsk_ca_ops->name);
  83                         strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1),
  84                                icsk->icsk_ca_ops->name);
  85                 }
  86         }
  87         r->idiag_family = sk->sk_family;
  88         r->idiag_state = sk->sk_state;
  89         r->idiag_timer = 0;
  90         r->idiag_retrans = 0;
  91
  92         r->id.idiag_if = sk->sk_bound_dev_if;
  93         r->id.idiag_cookie[0] = (u32)(unsigned long)sk;
  94         r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
  95
  96         if (r->idiag_state == TCP_TIME_WAIT) {
  97                 const struct inet_timewait_sock *tw = inet_twsk(sk);
  98                 long tmo = tw->tw_ttd - jiffies;
  99                 if (tmo < 0)
 100                         tmo = 0;
 101
 102                 r->id.idiag_sport = tw->tw_sport;
 103                 r->id.idiag_dport = tw->tw_dport;
 104                 r->id.idiag_src[0] = tw->tw_rcv_saddr;
 105                 r->id.idiag_dst[0] = tw->tw_daddr;
 106                 r->idiag_state = tw->tw_substate;
 107                 r->idiag_timer = 3;
 108                 r->idiag_expires = (tmo * 1000 + HZ - 1) / HZ;
 109                 r->idiag_rqueue = 0;
 110                 r->idiag_wqueue = 0;
 111                 r->idiag_uid = 0;
 112                 r->idiag_inode = 0;
 113 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 114                 if (r->idiag_family == AF_INET6) {
 115                         const struct inet6_timewait_sock *tw6 = inet6_twsk(sk);
 116
 117                         ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
 118                                        &tw6->tw_v6_rcv_saddr);
 119                         ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
 120                                        &tw6->tw_v6_daddr);
 121                 }
 122 #endif
 123                 nlh->nlmsg_len = skb->tail - b;
 124                 return skb->len;
 125         }
 126
 127         r->id.idiag_sport = inet->sport;
 128         r->id.idiag_dport = inet->dport;
 129         r->id.idiag_src[0] = inet->rcv_saddr;
 130         r->id.idiag_dst[0] = inet->daddr;
 131
 132 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 133         if (r->idiag_family == AF_INET6) {
 134                 struct ipv6_pinfo *np = inet6_sk(sk);
 135
 136                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
 137                                &np->rcv_saddr);
 138                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
 139                                &np->daddr);
 140         }
 141 #endif
 142
 143 #define EXPIRES_IN_MS(tmo)  ((tmo - jiffies) * 1000 + HZ - 1) / HZ
 144
 145         if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
 146                 r->idiag_timer = 1;
 147                 r->idiag_retrans = icsk->icsk_retransmits;
 148                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
 149         } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
 150                 r->idiag_timer = 4;
 151                 r->idiag_retrans = icsk->icsk_probes_out;
 152                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
 153         } else if (timer_pending(&sk->sk_timer)) {
 154                 r->idiag_timer = 2;
 155                 r->idiag_retrans = icsk->icsk_probes_out;
 156                 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
 157         } else {
 158                 r->idiag_timer = 0;
 159                 r->idiag_expires = 0;
 160         }
 161 #undef EXPIRES_IN_MS
 162
 163         r->idiag_uid = sock_i_uid(sk);
 164         r->idiag_inode = sock_i_ino(sk);
 165
 166         if (minfo) {
 167                 minfo->idiag_rmem = atomic_read(&sk->sk_rmem_alloc);
 168                 minfo->idiag_wmem = sk->sk_wmem_queued;
 169                 minfo->idiag_fmem = sk->sk_forward_alloc;
 170                 minfo->idiag_tmem = atomic_read(&sk->sk_wmem_alloc);
 171         }
 172
 173         handler->idiag_get_info(sk, r, info);
 174
 175         if (sk->sk_state < TCP_TIME_WAIT &&
 176             icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
 177                 icsk->icsk_ca_ops->get_info(sk, ext, skb);
 178
 179         nlh->nlmsg_len = skb->tail - b;
 180         return skb->len;
 181
 182 rtattr_failure:
 183 nlmsg_failure:
 184         skb_trim(skb, b - skb->data);
 185         return -1;
 186 }
 187
 188 static int inet_diag_get_exact(struct sk_buff *in_skb,
 189                                const struct nlmsghdr *nlh)
 190 {
 191         int err;
 192         struct sock *sk;
 193         struct inet_diag_req *req = NLMSG_DATA(nlh);
 194         struct sk_buff *rep;
 195         struct inet_hashinfo *hashinfo;
 196         const struct inet_diag_handler *handler;
 197
 198         handler = inet_diag_table[nlh->nlmsg_type];
 199         BUG_ON(handler == NULL);
 200         hashinfo = handler->idiag_hashinfo;
 201
 202         if (req->idiag_family == AF_INET) {
 203                 sk = inet_lookup(hashinfo, req->id.idiag_dst[0],
 204                                  req->id.idiag_dport, req->id.idiag_src[0],
 205                                  req->id.idiag_sport, req->id.idiag_if);
 206         }
 207 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 208         else if (req->idiag_family == AF_INET6) {
 209                 sk = inet6_lookup(hashinfo,
 210                                   (struct in6_addr *)req->id.idiag_dst,
 211                                   req->id.idiag_dport,
 212                                   (struct in6_addr *)req->id.idiag_src,
 213                                   req->id.idiag_sport,
 214                                   req->id.idiag_if);
 215         }
 216 #endif
 217         else {
 218                 return -EINVAL;
 219         }
 220
 221         if (sk == NULL)
 222                 return -ENOENT;
 223
 224         err = -ESTALE;
 225         if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE ||
 226              req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) &&
 227             ((u32)(unsigned long)sk != req->id.idiag_cookie[0] ||
 228              (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1]))
 229                 goto out;
 230
 231         err = -ENOMEM;
 232         rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
 233                                      sizeof(struct inet_diag_meminfo) +
 234                                      handler->idiag_info_size + 64)),
 235                         GFP_KERNEL);
 236         if (!rep)
 237                 goto out;
 238
 239         if (inet_diag_fill(rep, sk, req->idiag_ext,
 240                          NETLINK_CB(in_skb).pid,
 241                          nlh->nlmsg_seq, 0, nlh) <= 0)
 242                 BUG();
 243
 244         err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid,
 245                               MSG_DONTWAIT);
 246         if (err > 0)
 247                 err = 0;
 248
 249 out:
 250         if (sk) {
 251                 if (sk->sk_state == TCP_TIME_WAIT)
 252                         inet_twsk_put((struct inet_timewait_sock *)sk);
 253                 else
 254                         sock_put(sk);
 255         }
 256         return err;
 257 }
 258
 259 static int bitstring_match(const u32 *a1, const u32 *a2, int bits)
 260 {
 261         int words = bits >> 5;
 262
 263         bits &= 0x1f;
 264
 265         if (words) {
 266                 if (memcmp(a1, a2, words << 2))
 267                         return 0;
 268         }
 269         if (bits) {
 270                 __u32 w1, w2;
 271                 __u32 mask;
 272
 273                 w1 = a1[words];
 274                 w2 = a2[words];
 275
 276                 mask = htonl((0xffffffff) << (32 - bits));
 277
 278                 if ((w1 ^ w2) & mask)
 279                         return 0;
 280         }
 281
 282         return 1;
 283 }
 284
 285
 286 static int inet_diag_bc_run(const void *bc, int len,
 287                             const struct inet_diag_entry *entry)
 288 {
 289         while (len > 0) {
 290                 int yes = 1;
 291                 const struct inet_diag_bc_op *op = bc;
 292
 293                 switch (op->code) {
 294                 case INET_DIAG_BC_NOP:
 295                         break;
 296                 case INET_DIAG_BC_JMP:
 297                         yes = 0;
 298                         break;
 299                 case INET_DIAG_BC_S_GE:
 300                         yes = entry->sport >= op[1].no;
 301                         break;
 302                 case INET_DIAG_BC_S_LE:
 303                         yes = entry->dport <= op[1].no;
 304                         break;
 305                 case INET_DIAG_BC_D_GE:
 306                         yes = entry->dport >= op[1].no;
 307                         break;
 308                 case INET_DIAG_BC_D_LE:
 309                         yes = entry->dport <= op[1].no;
 310                         break;
 311                 case INET_DIAG_BC_AUTO:
 312                         yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
 313                         break;
 314                 case INET_DIAG_BC_S_COND:
 315                 case INET_DIAG_BC_D_COND: {
 316                         struct inet_diag_hostcond *cond;
 317                         u32 *addr;
 318
 319                         cond = (struct inet_diag_hostcond *)(op + 1);
 320                         if (cond->port != -1 &&
 321                             cond->port != (op->code == INET_DIAG_BC_S_COND ?
 322                                              entry->sport : entry->dport)) {
 323                                 yes = 0;
 324                                 break;
 325                         }
 326
 327                         if (cond->prefix_len == 0)
 328                                 break;
 329
 330                         if (op->code == INET_DIAG_BC_S_COND)
 331                                 addr = entry->saddr;
 332                         else
 333                                 addr = entry->daddr;
 334
 335                         if (bitstring_match(addr, cond->addr,
 336                                             cond->prefix_len))
 337                                 break;
 338                         if (entry->family == AF_INET6 &&
 339                             cond->family == AF_INET) {
 340                                 if (addr[0] == 0 && addr[1] == 0 &&
 341                                     addr[2] == htonl(0xffff) &&
 342                                     bitstring_match(addr + 3, cond->addr,
 343                                                     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 inet_diag_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 inet_diag_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 inet_diag_bc_op *op = (struct inet_diag_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 INET_DIAG_BC_AUTO:
 390                 case INET_DIAG_BC_S_COND:
 391                 case INET_DIAG_BC_D_COND:
 392                 case INET_DIAG_BC_S_GE:
 393                 case INET_DIAG_BC_S_LE:
 394                 case INET_DIAG_BC_D_GE:
 395                 case INET_DIAG_BC_D_LE:
 396                         if (op->yes < 4 || op->yes > len + 4)
 397                                 return -EINVAL;
 398                 case INET_DIAG_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 INET_DIAG_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 inet_diag_dump_sock(struct sk_buff *skb, struct sock *sk,
 419                                struct netlink_callback *cb)
 420 {
 421         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
 422
 423         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
 424                 struct inet_diag_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 (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
 446                         return 0;
 447         }
 448
 449         return inet_diag_fill(skb, sk, r->idiag_ext, NETLINK_CB(cb->skb).pid,
 450                               cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
 451 }
 452
 453 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
 454                               struct request_sock *req, u32 pid, u32 seq,
 455                               const struct nlmsghdr *unlh)
 456 {
 457         const struct inet_request_sock *ireq = inet_rsk(req);
 458         struct inet_sock *inet = inet_sk(sk);
 459         unsigned char *b = skb->tail;
 460         struct inet_diag_msg *r;
 461         struct nlmsghdr *nlh;
 462         long tmo;
 463
 464         nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
 465         nlh->nlmsg_flags = NLM_F_MULTI;
 466         r = NLMSG_DATA(nlh);
 467
 468         r->idiag_family = sk->sk_family;
 469         r->idiag_state = TCP_SYN_RECV;
 470         r->idiag_timer = 1;
 471         r->idiag_retrans = req->retrans;
 472
 473         r->id.idiag_if = sk->sk_bound_dev_if;
 474         r->id.idiag_cookie[0] = (u32)(unsigned long)req;
 475         r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
 476
 477         tmo = req->expires - jiffies;
 478         if (tmo < 0)
 479                 tmo = 0;
 480
 481         r->id.idiag_sport = inet->sport;
 482         r->id.idiag_dport = ireq->rmt_port;
 483         r->id.idiag_src[0] = ireq->loc_addr;
 484         r->id.idiag_dst[0] = ireq->rmt_addr;
 485         r->idiag_expires = jiffies_to_msecs(tmo);
 486         r->idiag_rqueue = 0;
 487         r->idiag_wqueue = 0;
 488         r->idiag_uid = sock_i_uid(sk);
 489         r->idiag_inode = 0;
 490 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 491         if (r->idiag_family == AF_INET6) {
 492                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
 493                                &inet6_rsk(req)->loc_addr);
 494                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
 495                                &inet6_rsk(req)->rmt_addr);
 496         }
 497 #endif
 498         nlh->nlmsg_len = skb->tail - b;
 499
 500         return skb->len;
 501
 502 nlmsg_failure:
 503         skb_trim(skb, b - skb->data);
 504         return -1;
 505 }
 506
 507 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
 508                                struct netlink_callback *cb)
 509 {
 510         struct inet_diag_entry entry;
 511         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
 512         struct inet_connection_sock *icsk = inet_csk(sk);
 513         struct listen_sock *lopt;
 514         struct rtattr *bc = NULL;
 515         struct inet_sock *inet = inet_sk(sk);
 516         int j, s_j;
 517         int reqnum, s_reqnum;
 518         int err = 0;
 519
 520         s_j = cb->args[3];
 521         s_reqnum = cb->args[4];
 522
 523         if (s_j > 0)
 524                 s_j--;
 525
 526         entry.family = sk->sk_family;
 527
 528         read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 529
 530         lopt = icsk->icsk_accept_queue.listen_opt;
 531         if (!lopt || !lopt->qlen)
 532                 goto out;
 533
 534         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
 535                 bc = (struct rtattr *)(r + 1);
 536                 entry.sport = inet->num;
 537                 entry.userlocks = sk->sk_userlocks;
 538         }
 539
 540         for (j = s_j; j < lopt->nr_table_entries; j++) {
 541                 struct request_sock *req, *head = lopt->syn_table[j];
 542
 543                 reqnum = 0;
 544                 for (req = head; req; reqnum++, req = req->dl_next) {
 545                         struct inet_request_sock *ireq = inet_rsk(req);
 546
 547                         if (reqnum < s_reqnum)
 548                                 continue;
 549                         if (r->id.idiag_dport != ireq->rmt_port &&
 550                             r->id.idiag_dport)
 551                                 continue;
 552
 553                         if (bc) {
 554                                 entry.saddr =
 555 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 556                                         (entry.family == AF_INET6) ?
 557                                         inet6_rsk(req)->loc_addr.s6_addr32 :
 558 #endif
 559                                         &ireq->loc_addr;
 560                                 entry.daddr =
 561 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 562                                         (entry.family == AF_INET6) ?
 563                                         inet6_rsk(req)->rmt_addr.s6_addr32 :
 564 #endif
 565                                         &ireq->rmt_addr;
 566                                 entry.dport = ntohs(ireq->rmt_port);
 567
 568                                 if (!inet_diag_bc_run(RTA_DATA(bc),
 569                                                     RTA_PAYLOAD(bc), &entry))
 570                                         continue;
 571                         }
 572
 573                         err = inet_diag_fill_req(skb, sk, req,
 574                                                NETLINK_CB(cb->skb).pid,
 575                                                cb->nlh->nlmsg_seq, cb->nlh);
 576                         if (err < 0) {
 577                                 cb->args[3] = j + 1;
 578                                 cb->args[4] = reqnum;
 579                                 goto out;
 580                         }
 581                 }
 582
 583                 s_reqnum = 0;
 584         }
 585
 586 out:
 587         read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 588
 589         return err;
 590 }
 591
 592 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
 593 {
 594         int i, num;
 595         int s_i, s_num;
 596         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
 597         const struct inet_diag_handler *handler;
 598         struct inet_hashinfo *hashinfo;
 599
 600         handler = inet_diag_table[cb->nlh->nlmsg_type];
 601         BUG_ON(handler == NULL);
 602         hashinfo = handler->idiag_hashinfo;
 603
 604         s_i = cb->args[1];
 605         s_num = num = cb->args[2];
 606
 607         if (cb->args[0] == 0) {
 608                 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
 609                         goto skip_listen_ht;
 610
 611                 inet_listen_lock(hashinfo);
 612                 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
 613                         struct sock *sk;
 614                         struct hlist_node *node;
 615
 616                         num = 0;
 617                         sk_for_each(sk, node, &hashinfo->listening_hash[i]) {
 618                                 struct inet_sock *inet = inet_sk(sk);
 619
 620                                 if (num < s_num) {
 621                                         num++;
 622                                         continue;
 623                                 }
 624
 625                                 if (r->id.idiag_sport != inet->sport &&
 626                                     r->id.idiag_sport)
 627                                         goto next_listen;
 628
 629                                 if (!(r->idiag_states & TCPF_LISTEN) ||
 630                                     r->id.idiag_dport ||
 631                                     cb->args[3] > 0)
 632                                         goto syn_recv;
 633
 634                                 if (inet_diag_dump_sock(skb, sk, cb) < 0) {
 635                                         inet_listen_unlock(hashinfo);
 636                                         goto done;
 637                                 }
 638
 639 syn_recv:
 640                                 if (!(r->idiag_states & TCPF_SYN_RECV))
 641                                         goto next_listen;
 642
 643                                 if (inet_diag_dump_reqs(skb, sk, cb) < 0) {
 644                                         inet_listen_unlock(hashinfo);
 645                                         goto done;
 646                                 }
 647
 648 next_listen:
 649                                 cb->args[3] = 0;
 650                                 cb->args[4] = 0;
 651                                 ++num;
 652                         }
 653
 654                         s_num = 0;
 655                         cb->args[3] = 0;
 656                         cb->args[4] = 0;
 657                 }
 658                 inet_listen_unlock(hashinfo);
 659 skip_listen_ht:
 660                 cb->args[0] = 1;
 661                 s_i = num = s_num = 0;
 662         }
 663
 664         if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
 665                 return skb->len;
 666
 667         for (i = s_i; i < hashinfo->ehash_size; i++) {
 668                 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
 669                 struct sock *sk;
 670                 struct hlist_node *node;
 671
 672                 if (i > s_i)
 673                         s_num = 0;
 674
 675                 read_lock_bh(&head->lock);
 676                 num = 0;
 677                 sk_for_each(sk, node, &head->chain) {
 678                         struct inet_sock *inet = inet_sk(sk);
 679
 680                         if (num < s_num)
 681                                 goto next_normal;
 682                         if (!(r->idiag_states & (1 << sk->sk_state)))
 683                                 goto next_normal;
 684                         if (r->id.idiag_sport != inet->sport &&
 685                             r->id.idiag_sport)
 686                                 goto next_normal;
 687                         if (r->id.idiag_dport != inet->dport &&
 688                             r->id.idiag_dport)
 689                                 goto next_normal;
 690                         if (inet_diag_dump_sock(skb, sk, cb) < 0) {
 691                                 read_unlock_bh(&head->lock);
 692                                 goto done;
 693                         }
 694 next_normal:
 695                         ++num;
 696                 }
 697
 698                 if (r->idiag_states & TCPF_TIME_WAIT) {
 699                         sk_for_each(sk, node,
 700                                     &hashinfo->ehash[i + hashinfo->ehash_size].chain) {
 701                                 const struct inet_timewait_sock *tw = inet_twsk(sk);
 702
 703                                 if (num < s_num)
 704                                         goto next_dying;
 705                                 if (r->id.idiag_sport != tw->tw_sport &&
 706                                     r->id.idiag_sport)
 707                                         goto next_dying;
 708                                 if (r->id.idiag_dport != tw->tw_dport &&
 709                                     r->id.idiag_dport)
 710                                         goto next_dying;
 711                                 if (inet_diag_dump_sock(skb, sk, cb) < 0) {
 712                                         read_unlock_bh(&head->lock);
 713                                         goto done;
 714                                 }
 715 next_dying:
 716                                 ++num;
 717                         }
 718                 }
 719                 read_unlock_bh(&head->lock);
 720         }
 721
 722 done:
 723         cb->args[1] = i;
 724         cb->args[2] = num;
 725         return skb->len;
 726 }
 727
 728 static inline int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
 729 {
 730         if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
 731                 return 0;
 732
 733         if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX)
 734                 goto err_inval;
 735
 736         if (inet_diag_table[nlh->nlmsg_type] == NULL)
 737                 return -ENOENT;
 738
 739         if (NLMSG_LENGTH(sizeof(struct inet_diag_req)) > skb->len)
 740                 goto err_inval;
 741
 742         if (nlh->nlmsg_flags&NLM_F_DUMP) {
 743                 if (nlh->nlmsg_len >
 744                     (4 + NLMSG_SPACE(sizeof(struct inet_diag_req)))) {
 745                         struct rtattr *rta = (void *)(NLMSG_DATA(nlh) +
 746                                                  sizeof(struct inet_diag_req));
 747                         if (rta->rta_type != INET_DIAG_REQ_BYTECODE ||
 748                             rta->rta_len < 8 ||
 749                             rta->rta_len >
 750                             (nlh->nlmsg_len -
 751                              NLMSG_SPACE(sizeof(struct inet_diag_req))))
 752                                 goto err_inval;
 753                         if (inet_diag_bc_audit(RTA_DATA(rta), RTA_PAYLOAD(rta)))
 754                                 goto err_inval;
 755                 }
 756                 return netlink_dump_start(idiagnl, skb, nlh,
 757                                           inet_diag_dump, NULL);
 758         } else
 759                 return inet_diag_get_exact(skb, nlh);
 760
 761 err_inval:
 762         return -EINVAL;
 763 }
 764
 765
 766 static inline void inet_diag_rcv_skb(struct sk_buff *skb)
 767 {
 768         if (skb->len >= NLMSG_SPACE(0)) {
 769                 int err;
 770                 struct nlmsghdr *nlh = (struct nlmsghdr *)skb->data;
 771
 772                 if (nlh->nlmsg_len < sizeof(*nlh) ||
 773                     skb->len < nlh->nlmsg_len)
 774                         return;
 775                 err = inet_diag_rcv_msg(skb, nlh);
 776                 if (err || nlh->nlmsg_flags & NLM_F_ACK)
 777                         netlink_ack(skb, nlh, err);
 778         }
 779 }
 780
 781 static void inet_diag_rcv(struct sock *sk, int len)
 782 {
 783         struct sk_buff *skb;
 784         unsigned int qlen = skb_queue_len(&sk->sk_receive_queue);
 785
 786         while (qlen-- && (skb = skb_dequeue(&sk->sk_receive_queue))) {
 787                 inet_diag_rcv_skb(skb);
 788                 kfree_skb(skb);
 789         }
 790 }
 791
 792 static DEFINE_SPINLOCK(inet_diag_register_lock);
 793
 794 int inet_diag_register(const struct inet_diag_handler *h)
 795 {
 796         const __u16 type = h->idiag_type;
 797         int err = -EINVAL;
 798
 799         if (type >= INET_DIAG_GETSOCK_MAX)
 800                 goto out;
 801
 802         spin_lock(&inet_diag_register_lock);
 803         err = -EEXIST;
 804         if (inet_diag_table[type] == NULL) {
 805                 inet_diag_table[type] = h;
 806                 err = 0;
 807         }
 808         spin_unlock(&inet_diag_register_lock);
 809 out:
 810         return err;
 811 }
 812 EXPORT_SYMBOL_GPL(inet_diag_register);
 813
 814 void inet_diag_unregister(const struct inet_diag_handler *h)
 815 {
 816         const __u16 type = h->idiag_type;
 817
 818         if (type >= INET_DIAG_GETSOCK_MAX)
 819                 return;
 820
 821         spin_lock(&inet_diag_register_lock);
 822         inet_diag_table[type] = NULL;
 823         spin_unlock(&inet_diag_register_lock);
 824
 825         synchronize_rcu();
 826 }
 827 EXPORT_SYMBOL_GPL(inet_diag_unregister);
 828
 829 static int __init inet_diag_init(void)
 830 {
 831         const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX *
 832                                           sizeof(struct inet_diag_handler *));
 833         int err = -ENOMEM;
 834
 835         inet_diag_table = kmalloc(inet_diag_table_size, GFP_KERNEL);
 836         if (!inet_diag_table)
 837                 goto out;
 838
 839         memset(inet_diag_table, 0, inet_diag_table_size);
 840         idiagnl = netlink_kernel_create(NETLINK_INET_DIAG, 0, inet_diag_rcv,
 841                                         THIS_MODULE);
 842         if (idiagnl == NULL)
 843                 goto out_free_table;
 844         err = 0;
 845 out:
 846         return err;
 847 out_free_table:
 848         kfree(inet_diag_table);
 849         goto out;
 850 }
 851
 852 static void __exit inet_diag_exit(void)
 853 {
 854         sock_release(idiagnl->sk_socket);
 855         kfree(inet_diag_table);
 856 }
 857
 858 module_init(inet_diag_init);
 859 module_exit(inet_diag_exit);
 860 MODULE_LICENSE("GPL");