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   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/module.h>
  15 #include <linux/types.h>
  16 #include <linux/fcntl.h>
  17 #include <linux/random.h>
  18 #include <linux/cache.h>
  19 #include <linux/init.h>
  20 #include <linux/time.h>
  21
  22 #include <net/icmp.h>
  23 #include <net/tcp.h>
  24 #include <net/ipv6.h>
  25 #include <net/inet_common.h>
  26 #include <net/inet_connection_sock.h>
  27 #include <net/inet_hashtables.h>
  28 #include <net/inet_timewait_sock.h>
  29 #include <net/inet6_hashtables.h>
  30
  31 #include <linux/inet.h>
  32 #include <linux/stddef.h>
  33
  34 #include <linux/inet_diag.h>
  35
  36 static const struct inet_diag_handler **inet_diag_table;
  37
  38 struct inet_diag_entry {
  39         u32 *saddr;
  40         u32 *daddr;
  41         u16 sport;
  42         u16 dport;
  43         u16 family;
  44         u16 userlocks;
  45 };
  46
  47 static struct sock *idiagnl;
  48
  49 #define INET_DIAG_PUT(skb, attrtype, attrlen) \
  50         RTA_DATA(__RTA_PUT(skb, attrtype, attrlen))
  51
  52 static int inet_csk_diag_fill(struct sock *sk,
  53                               struct sk_buff *skb,
  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         BUG_ON(sk->sk_state == TCP_TIME_WAIT);
  74
  75         if (ext & (1 << (INET_DIAG_MEMINFO - 1)))
  76                 minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo));
  77
  78         if (ext & (1 << (INET_DIAG_INFO - 1)))
  79                 info = INET_DIAG_PUT(skb, INET_DIAG_INFO,
  80                                      handler->idiag_info_size);
  81
  82         if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) {
  83                 const size_t len = strlen(icsk->icsk_ca_ops->name);
  84
  85                 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1),
  86                        icsk->icsk_ca_ops->name);
  87         }
  88
  89         r->idiag_family = sk->sk_family;
  90         r->idiag_state = sk->sk_state;
  91         r->idiag_timer = 0;
  92         r->idiag_retrans = 0;
  93
  94         r->id.idiag_if = sk->sk_bound_dev_if;
  95         r->id.idiag_cookie[0] = (u32)(unsigned long)sk;
  96         r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
  97
  98         r->id.idiag_sport = inet->sport;
  99         r->id.idiag_dport = inet->dport;
 100         r->id.idiag_src[0] = inet->rcv_saddr;
 101         r->id.idiag_dst[0] = inet->daddr;
 102
 103 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 104         if (r->idiag_family == AF_INET6) {
 105                 struct ipv6_pinfo *np = inet6_sk(sk);
 106
 107                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
 108                                &np->rcv_saddr);
 109                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
 110                                &np->daddr);
 111         }
 112 #endif
 113
 114 #define EXPIRES_IN_MS(tmo)  ((tmo - jiffies) * 1000 + HZ - 1) / HZ
 115
 116         if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
 117                 r->idiag_timer = 1;
 118                 r->idiag_retrans = icsk->icsk_retransmits;
 119                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
 120         } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
 121                 r->idiag_timer = 4;
 122                 r->idiag_retrans = icsk->icsk_probes_out;
 123                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
 124         } else if (timer_pending(&sk->sk_timer)) {
 125                 r->idiag_timer = 2;
 126                 r->idiag_retrans = icsk->icsk_probes_out;
 127                 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
 128         } else {
 129                 r->idiag_timer = 0;
 130                 r->idiag_expires = 0;
 131         }
 132 #undef EXPIRES_IN_MS
 133
 134         r->idiag_uid = sock_i_uid(sk);
 135         r->idiag_inode = sock_i_ino(sk);
 136
 137         if (minfo) {
 138                 minfo->idiag_rmem = atomic_read(&sk->sk_rmem_alloc);
 139                 minfo->idiag_wmem = sk->sk_wmem_queued;
 140                 minfo->idiag_fmem = sk->sk_forward_alloc;
 141                 minfo->idiag_tmem = atomic_read(&sk->sk_wmem_alloc);
 142         }
 143
 144         handler->idiag_get_info(sk, r, info);
 145
 146         if (sk->sk_state < TCP_TIME_WAIT &&
 147             icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
 148                 icsk->icsk_ca_ops->get_info(sk, ext, skb);
 149
 150         nlh->nlmsg_len = skb->tail - b;
 151         return skb->len;
 152
 153 rtattr_failure:
 154 nlmsg_failure:
 155         skb_trim(skb, b - skb->data);
 156         return -1;
 157 }
 158
 159 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
 160                                struct sk_buff *skb, int ext, u32 pid,
 161                                u32 seq, u16 nlmsg_flags,
 162                                const struct nlmsghdr *unlh)
 163 {
 164         long tmo;
 165         struct inet_diag_msg *r;
 166         const unsigned char *previous_tail = skb->tail;
 167         struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq,
 168                                          unlh->nlmsg_type, sizeof(*r));
 169
 170         r = NLMSG_DATA(nlh);
 171         BUG_ON(tw->tw_state != TCP_TIME_WAIT);
 172
 173         nlh->nlmsg_flags = nlmsg_flags;
 174
 175         tmo = tw->tw_ttd - jiffies;
 176         if (tmo < 0)
 177                 tmo = 0;
 178
 179         r->idiag_family       = tw->tw_family;
 180         r->idiag_state        = tw->tw_state;
 181         r->idiag_timer        = 0;
 182         r->idiag_retrans      = 0;
 183         r->id.idiag_if        = tw->tw_bound_dev_if;
 184         r->id.idiag_cookie[0] = (u32)(unsigned long)tw;
 185         r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1);
 186         r->id.idiag_sport     = tw->tw_sport;
 187         r->id.idiag_dport     = tw->tw_dport;
 188         r->id.idiag_src[0]    = tw->tw_rcv_saddr;
 189         r->id.idiag_dst[0]    = tw->tw_daddr;
 190         r->idiag_state        = tw->tw_substate;
 191         r->idiag_timer        = 3;
 192         r->idiag_expires      = (tmo * 1000 + HZ - 1) / HZ;
 193         r->idiag_rqueue       = 0;
 194         r->idiag_wqueue       = 0;
 195         r->idiag_uid          = 0;
 196         r->idiag_inode        = 0;
 197 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 198         if (tw->tw_family == AF_INET6) {
 199                 const struct inet6_timewait_sock *tw6 =
 200                                                 inet6_twsk((struct sock *)tw);
 201
 202                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
 203                                &tw6->tw_v6_rcv_saddr);
 204                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
 205                                &tw6->tw_v6_daddr);
 206         }
 207 #endif
 208         nlh->nlmsg_len = skb->tail - previous_tail;
 209         return skb->len;
 210 nlmsg_failure:
 211         skb_trim(skb, previous_tail - skb->data);
 212         return -1;
 213 }
 214
 215 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
 216                         int ext, u32 pid, u32 seq, u16 nlmsg_flags,
 217                         const struct nlmsghdr *unlh)
 218 {
 219         if (sk->sk_state == TCP_TIME_WAIT)
 220                 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
 221                                            skb, ext, pid, seq, nlmsg_flags,
 222                                            unlh);
 223         return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh);
 224 }
 225
 226 static int inet_diag_get_exact(struct sk_buff *in_skb,
 227                                const struct nlmsghdr *nlh)
 228 {
 229         int err;
 230         struct sock *sk;
 231         struct inet_diag_req *req = NLMSG_DATA(nlh);
 232         struct sk_buff *rep;
 233         struct inet_hashinfo *hashinfo;
 234         const struct inet_diag_handler *handler;
 235
 236         handler = inet_diag_table[nlh->nlmsg_type];
 237         BUG_ON(handler == NULL);
 238         hashinfo = handler->idiag_hashinfo;
 239
 240         if (req->idiag_family == AF_INET) {
 241                 sk = inet_lookup(hashinfo, req->id.idiag_dst[0],
 242                                  req->id.idiag_dport, req->id.idiag_src[0],
 243                                  req->id.idiag_sport, req->id.idiag_if);
 244         }
 245 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 246         else if (req->idiag_family == AF_INET6) {
 247                 sk = inet6_lookup(hashinfo,
 248                                   (struct in6_addr *)req->id.idiag_dst,
 249                                   req->id.idiag_dport,
 250                                   (struct in6_addr *)req->id.idiag_src,
 251                                   req->id.idiag_sport,
 252                                   req->id.idiag_if);
 253         }
 254 #endif
 255         else {
 256                 return -EINVAL;
 257         }
 258
 259         if (sk == NULL)
 260                 return -ENOENT;
 261
 262         err = -ESTALE;
 263         if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE ||
 264              req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) &&
 265             ((u32)(unsigned long)sk != req->id.idiag_cookie[0] ||
 266              (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1]))
 267                 goto out;
 268
 269         err = -ENOMEM;
 270         rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
 271                                      sizeof(struct inet_diag_meminfo) +
 272                                      handler->idiag_info_size + 64)),
 273                         GFP_KERNEL);
 274         if (!rep)
 275                 goto out;
 276
 277         if (sk_diag_fill(sk, rep, req->idiag_ext,
 278                          NETLINK_CB(in_skb).pid,
 279                          nlh->nlmsg_seq, 0, nlh) <= 0)
 280                 BUG();
 281
 282         err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid,
 283                               MSG_DONTWAIT);
 284         if (err > 0)
 285                 err = 0;
 286
 287 out:
 288         if (sk) {
 289                 if (sk->sk_state == TCP_TIME_WAIT)
 290                         inet_twsk_put((struct inet_timewait_sock *)sk);
 291                 else
 292                         sock_put(sk);
 293         }
 294         return err;
 295 }
 296
 297 static int bitstring_match(const u32 *a1, const u32 *a2, int bits)
 298 {
 299         int words = bits >> 5;
 300
 301         bits &= 0x1f;
 302
 303         if (words) {
 304                 if (memcmp(a1, a2, words << 2))
 305                         return 0;
 306         }
 307         if (bits) {
 308                 __u32 w1, w2;
 309                 __u32 mask;
 310
 311                 w1 = a1[words];
 312                 w2 = a2[words];
 313
 314                 mask = htonl((0xffffffff) << (32 - bits));
 315
 316                 if ((w1 ^ w2) & mask)
 317                         return 0;
 318         }
 319
 320         return 1;
 321 }
 322
 323
 324 static int inet_diag_bc_run(const void *bc, int len,
 325                             const struct inet_diag_entry *entry)
 326 {
 327         while (len > 0) {
 328                 int yes = 1;
 329                 const struct inet_diag_bc_op *op = bc;
 330
 331                 switch (op->code) {
 332                 case INET_DIAG_BC_NOP:
 333                         break;
 334                 case INET_DIAG_BC_JMP:
 335                         yes = 0;
 336                         break;
 337                 case INET_DIAG_BC_S_GE:
 338                         yes = entry->sport >= op[1].no;
 339                         break;
 340                 case INET_DIAG_BC_S_LE:
 341                         yes = entry->dport <= op[1].no;
 342                         break;
 343                 case INET_DIAG_BC_D_GE:
 344                         yes = entry->dport >= op[1].no;
 345                         break;
 346                 case INET_DIAG_BC_D_LE:
 347                         yes = entry->dport <= op[1].no;
 348                         break;
 349                 case INET_DIAG_BC_AUTO:
 350                         yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
 351                         break;
 352                 case INET_DIAG_BC_S_COND:
 353                 case INET_DIAG_BC_D_COND: {
 354                         struct inet_diag_hostcond *cond;
 355                         u32 *addr;
 356
 357                         cond = (struct inet_diag_hostcond *)(op + 1);
 358                         if (cond->port != -1 &&
 359                             cond->port != (op->code == INET_DIAG_BC_S_COND ?
 360                                              entry->sport : entry->dport)) {
 361                                 yes = 0;
 362                                 break;
 363                         }
 364
 365                         if (cond->prefix_len == 0)
 366                                 break;
 367
 368                         if (op->code == INET_DIAG_BC_S_COND)
 369                                 addr = entry->saddr;
 370                         else
 371                                 addr = entry->daddr;
 372
 373                         if (bitstring_match(addr, cond->addr,
 374                                             cond->prefix_len))
 375                                 break;
 376                         if (entry->family == AF_INET6 &&
 377                             cond->family == AF_INET) {
 378                                 if (addr[0] == 0 && addr[1] == 0 &&
 379                                     addr[2] == htonl(0xffff) &&
 380                                     bitstring_match(addr + 3, cond->addr,
 381                                                     cond->prefix_len))
 382                                         break;
 383                         }
 384                         yes = 0;
 385                         break;
 386                 }
 387                 }
 388
 389                 if (yes) {
 390                         len -= op->yes;
 391                         bc += op->yes;
 392                 } else {
 393                         len -= op->no;
 394                         bc += op->no;
 395                 }
 396         }
 397         return (len == 0);
 398 }
 399
 400 static int valid_cc(const void *bc, int len, int cc)
 401 {
 402         while (len >= 0) {
 403                 const struct inet_diag_bc_op *op = bc;
 404
 405                 if (cc > len)
 406                         return 0;
 407                 if (cc == len)
 408                         return 1;
 409                 if (op->yes < 4)
 410                         return 0;
 411                 len -= op->yes;
 412                 bc  += op->yes;
 413         }
 414         return 0;
 415 }
 416
 417 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
 418 {
 419         const unsigned char *bc = bytecode;
 420         int  len = bytecode_len;
 421
 422         while (len > 0) {
 423                 struct inet_diag_bc_op *op = (struct inet_diag_bc_op *)bc;
 424
 425 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
 426                 switch (op->code) {
 427                 case INET_DIAG_BC_AUTO:
 428                 case INET_DIAG_BC_S_COND:
 429                 case INET_DIAG_BC_D_COND:
 430                 case INET_DIAG_BC_S_GE:
 431                 case INET_DIAG_BC_S_LE:
 432                 case INET_DIAG_BC_D_GE:
 433                 case INET_DIAG_BC_D_LE:
 434                         if (op->yes < 4 || op->yes > len + 4)
 435                                 return -EINVAL;
 436                 case INET_DIAG_BC_JMP:
 437                         if (op->no < 4 || op->no > len + 4)
 438                                 return -EINVAL;
 439                         if (op->no < len &&
 440                             !valid_cc(bytecode, bytecode_len, len - op->no))
 441                                 return -EINVAL;
 442                         break;
 443                 case INET_DIAG_BC_NOP:
 444                         if (op->yes < 4 || op->yes > len + 4)
 445                                 return -EINVAL;
 446                         break;
 447                 default:
 448                         return -EINVAL;
 449                 }
 450                 bc  += op->yes;
 451                 len -= op->yes;
 452         }
 453         return len == 0 ? 0 : -EINVAL;
 454 }
 455
 456 static int inet_csk_diag_dump(struct sock *sk,
 457                               struct sk_buff *skb,
 458                               struct netlink_callback *cb)
 459 {
 460         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
 461
 462         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
 463                 struct inet_diag_entry entry;
 464                 struct rtattr *bc = (struct rtattr *)(r + 1);
 465                 struct inet_sock *inet = inet_sk(sk);
 466
 467                 entry.family = sk->sk_family;
 468 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 469                 if (entry.family == AF_INET6) {
 470                         struct ipv6_pinfo *np = inet6_sk(sk);
 471
 472                         entry.saddr = np->rcv_saddr.s6_addr32;
 473                         entry.daddr = np->daddr.s6_addr32;
 474                 } else
 475 #endif
 476                 {
 477                         entry.saddr = &inet->rcv_saddr;
 478                         entry.daddr = &inet->daddr;
 479                 }
 480                 entry.sport = inet->num;
 481                 entry.dport = ntohs(inet->dport);
 482                 entry.userlocks = sk->sk_userlocks;
 483
 484                 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
 485                         return 0;
 486         }
 487
 488         return inet_csk_diag_fill(sk, skb, r->idiag_ext,
 489                                   NETLINK_CB(cb->skb).pid,
 490                                   cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
 491 }
 492
 493 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
 494                                struct sk_buff *skb,
 495                                struct netlink_callback *cb)
 496 {
 497         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
 498
 499         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
 500                 struct inet_diag_entry entry;
 501                 struct rtattr *bc = (struct rtattr *)(r + 1);
 502
 503                 entry.family = tw->tw_family;
 504 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 505                 if (tw->tw_family == AF_INET6) {
 506                         struct inet6_timewait_sock *tw6 =
 507                                                 inet6_twsk((struct sock *)tw);
 508                         entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
 509                         entry.daddr = tw6->tw_v6_daddr.s6_addr32;
 510                 } else
 511 #endif
 512                 {
 513                         entry.saddr = &tw->tw_rcv_saddr;
 514                         entry.daddr = &tw->tw_daddr;
 515                 }
 516                 entry.sport = tw->tw_num;
 517                 entry.dport = ntohs(tw->tw_dport);
 518                 entry.userlocks = 0;
 519
 520                 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
 521                         return 0;
 522         }
 523
 524         return inet_twsk_diag_fill(tw, skb, r->idiag_ext,
 525                                    NETLINK_CB(cb->skb).pid,
 526                                    cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
 527 }
 528
 529 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
 530                               struct request_sock *req, u32 pid, u32 seq,
 531                               const struct nlmsghdr *unlh)
 532 {
 533         const struct inet_request_sock *ireq = inet_rsk(req);
 534         struct inet_sock *inet = inet_sk(sk);
 535         unsigned char *b = skb->tail;
 536         struct inet_diag_msg *r;
 537         struct nlmsghdr *nlh;
 538         long tmo;
 539
 540         nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
 541         nlh->nlmsg_flags = NLM_F_MULTI;
 542         r = NLMSG_DATA(nlh);
 543
 544         r->idiag_family = sk->sk_family;
 545         r->idiag_state = TCP_SYN_RECV;
 546         r->idiag_timer = 1;
 547         r->idiag_retrans = req->retrans;
 548
 549         r->id.idiag_if = sk->sk_bound_dev_if;
 550         r->id.idiag_cookie[0] = (u32)(unsigned long)req;
 551         r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
 552
 553         tmo = req->expires - jiffies;
 554         if (tmo < 0)
 555                 tmo = 0;
 556
 557         r->id.idiag_sport = inet->sport;
 558         r->id.idiag_dport = ireq->rmt_port;
 559         r->id.idiag_src[0] = ireq->loc_addr;
 560         r->id.idiag_dst[0] = ireq->rmt_addr;
 561         r->idiag_expires = jiffies_to_msecs(tmo);
 562         r->idiag_rqueue = 0;
 563         r->idiag_wqueue = 0;
 564         r->idiag_uid = sock_i_uid(sk);
 565         r->idiag_inode = 0;
 566 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 567         if (r->idiag_family == AF_INET6) {
 568                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
 569                                &inet6_rsk(req)->loc_addr);
 570                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
 571                                &inet6_rsk(req)->rmt_addr);
 572         }
 573 #endif
 574         nlh->nlmsg_len = skb->tail - b;
 575
 576         return skb->len;
 577
 578 nlmsg_failure:
 579         skb_trim(skb, b - skb->data);
 580         return -1;
 581 }
 582
 583 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
 584                                struct netlink_callback *cb)
 585 {
 586         struct inet_diag_entry entry;
 587         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
 588         struct inet_connection_sock *icsk = inet_csk(sk);
 589         struct listen_sock *lopt;
 590         struct rtattr *bc = NULL;
 591         struct inet_sock *inet = inet_sk(sk);
 592         int j, s_j;
 593         int reqnum, s_reqnum;
 594         int err = 0;
 595
 596         s_j = cb->args[3];
 597         s_reqnum = cb->args[4];
 598
 599         if (s_j > 0)
 600                 s_j--;
 601
 602         entry.family = sk->sk_family;
 603
 604         read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 605
 606         lopt = icsk->icsk_accept_queue.listen_opt;
 607         if (!lopt || !lopt->qlen)
 608                 goto out;
 609
 610         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
 611                 bc = (struct rtattr *)(r + 1);
 612                 entry.sport = inet->num;
 613                 entry.userlocks = sk->sk_userlocks;
 614         }
 615
 616         for (j = s_j; j < lopt->nr_table_entries; j++) {
 617                 struct request_sock *req, *head = lopt->syn_table[j];
 618
 619                 reqnum = 0;
 620                 for (req = head; req; reqnum++, req = req->dl_next) {
 621                         struct inet_request_sock *ireq = inet_rsk(req);
 622
 623                         if (reqnum < s_reqnum)
 624                                 continue;
 625                         if (r->id.idiag_dport != ireq->rmt_port &&
 626                             r->id.idiag_dport)
 627                                 continue;
 628
 629                         if (bc) {
 630                                 entry.saddr =
 631 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 632                                         (entry.family == AF_INET6) ?
 633                                         inet6_rsk(req)->loc_addr.s6_addr32 :
 634 #endif
 635                                         &ireq->loc_addr;
 636                                 entry.daddr =
 637 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 638                                         (entry.family == AF_INET6) ?
 639                                         inet6_rsk(req)->rmt_addr.s6_addr32 :
 640 #endif
 641                                         &ireq->rmt_addr;
 642                                 entry.dport = ntohs(ireq->rmt_port);
 643
 644                                 if (!inet_diag_bc_run(RTA_DATA(bc),
 645                                                     RTA_PAYLOAD(bc), &entry))
 646                                         continue;
 647                         }
 648
 649                         err = inet_diag_fill_req(skb, sk, req,
 650                                                NETLINK_CB(cb->skb).pid,
 651                                                cb->nlh->nlmsg_seq, cb->nlh);
 652                         if (err < 0) {
 653                                 cb->args[3] = j + 1;
 654                                 cb->args[4] = reqnum;
 655                                 goto out;
 656                         }
 657                 }
 658
 659                 s_reqnum = 0;
 660         }
 661
 662 out:
 663         read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 664
 665         return err;
 666 }
 667
 668 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
 669 {
 670         int i, num;
 671         int s_i, s_num;
 672         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
 673         const struct inet_diag_handler *handler;
 674         struct inet_hashinfo *hashinfo;
 675
 676         handler = inet_diag_table[cb->nlh->nlmsg_type];
 677         BUG_ON(handler == NULL);
 678         hashinfo = handler->idiag_hashinfo;
 679
 680         s_i = cb->args[1];
 681         s_num = num = cb->args[2];
 682
 683         if (cb->args[0] == 0) {
 684                 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
 685                         goto skip_listen_ht;
 686
 687                 inet_listen_lock(hashinfo);
 688                 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
 689                         struct sock *sk;
 690                         struct hlist_node *node;
 691
 692                         num = 0;
 693                         sk_for_each(sk, node, &hashinfo->listening_hash[i]) {
 694                                 struct inet_sock *inet = inet_sk(sk);
 695
 696                                 if (num < s_num) {
 697                                         num++;
 698                                         continue;
 699                                 }
 700
 701                                 if (r->id.idiag_sport != inet->sport &&
 702                                     r->id.idiag_sport)
 703                                         goto next_listen;
 704
 705                                 if (!(r->idiag_states & TCPF_LISTEN) ||
 706                                     r->id.idiag_dport ||
 707                                     cb->args[3] > 0)
 708                                         goto syn_recv;
 709
 710                                 if (inet_csk_diag_dump(sk, skb, cb) < 0) {
 711                                         inet_listen_unlock(hashinfo);
 712                                         goto done;
 713                                 }
 714
 715 syn_recv:
 716                                 if (!(r->idiag_states & TCPF_SYN_RECV))
 717                                         goto next_listen;
 718
 719                                 if (inet_diag_dump_reqs(skb, sk, cb) < 0) {
 720                                         inet_listen_unlock(hashinfo);
 721                                         goto done;
 722                                 }
 723
 724 next_listen:
 725                                 cb->args[3] = 0;
 726                                 cb->args[4] = 0;
 727                                 ++num;
 728                         }
 729
 730                         s_num = 0;
 731                         cb->args[3] = 0;
 732                         cb->args[4] = 0;
 733                 }
 734                 inet_listen_unlock(hashinfo);
 735 skip_listen_ht:
 736                 cb->args[0] = 1;
 737                 s_i = num = s_num = 0;
 738         }
 739
 740         if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
 741                 return skb->len;
 742
 743         for (i = s_i; i < hashinfo->ehash_size; i++) {
 744                 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
 745                 struct sock *sk;
 746                 struct hlist_node *node;
 747
 748                 if (i > s_i)
 749                         s_num = 0;
 750
 751                 read_lock_bh(&head->lock);
 752                 num = 0;
 753                 sk_for_each(sk, node, &head->chain) {
 754                         struct inet_sock *inet = inet_sk(sk);
 755
 756                         if (num < s_num)
 757                                 goto next_normal;
 758                         if (!(r->idiag_states & (1 << sk->sk_state)))
 759                                 goto next_normal;
 760                         if (r->id.idiag_sport != inet->sport &&
 761                             r->id.idiag_sport)
 762                                 goto next_normal;
 763                         if (r->id.idiag_dport != inet->dport &&
 764                             r->id.idiag_dport)
 765                                 goto next_normal;
 766                         if (inet_csk_diag_dump(sk, skb, cb) < 0) {
 767                                 read_unlock_bh(&head->lock);
 768                                 goto done;
 769                         }
 770 next_normal:
 771                         ++num;
 772                 }
 773
 774                 if (r->idiag_states & TCPF_TIME_WAIT) {
 775                         struct inet_timewait_sock *tw;
 776
 777                         inet_twsk_for_each(tw, node,
 778                                     &hashinfo->ehash[i + hashinfo->ehash_size].chain) {
 779
 780                                 if (num < s_num)
 781                                         goto next_dying;
 782                                 if (r->id.idiag_sport != tw->tw_sport &&
 783                                     r->id.idiag_sport)
 784                                         goto next_dying;
 785                                 if (r->id.idiag_dport != tw->tw_dport &&
 786                                     r->id.idiag_dport)
 787                                         goto next_dying;
 788                                 if (inet_twsk_diag_dump(tw, skb, cb) < 0) {
 789                                         read_unlock_bh(&head->lock);
 790                                         goto done;
 791                                 }
 792 next_dying:
 793                                 ++num;
 794                         }
 795                 }
 796                 read_unlock_bh(&head->lock);
 797         }
 798
 799 done:
 800         cb->args[1] = i;
 801         cb->args[2] = num;
 802         return skb->len;
 803 }
 804
 805 static inline int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
 806 {
 807         if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
 808                 return 0;
 809
 810         if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX)
 811                 goto err_inval;
 812
 813         if (inet_diag_table[nlh->nlmsg_type] == NULL)
 814                 return -ENOENT;
 815
 816         if (NLMSG_LENGTH(sizeof(struct inet_diag_req)) > skb->len)
 817                 goto err_inval;
 818
 819         if (nlh->nlmsg_flags&NLM_F_DUMP) {
 820                 if (nlh->nlmsg_len >
 821                     (4 + NLMSG_SPACE(sizeof(struct inet_diag_req)))) {
 822                         struct rtattr *rta = (void *)(NLMSG_DATA(nlh) +
 823                                                  sizeof(struct inet_diag_req));
 824                         if (rta->rta_type != INET_DIAG_REQ_BYTECODE ||
 825                             rta->rta_len < 8 ||
 826                             rta->rta_len >
 827                             (nlh->nlmsg_len -
 828                              NLMSG_SPACE(sizeof(struct inet_diag_req))))
 829                                 goto err_inval;
 830                         if (inet_diag_bc_audit(RTA_DATA(rta), RTA_PAYLOAD(rta)))
 831                                 goto err_inval;
 832                 }
 833                 return netlink_dump_start(idiagnl, skb, nlh,
 834                                           inet_diag_dump, NULL);
 835         } else
 836                 return inet_diag_get_exact(skb, nlh);
 837
 838 err_inval:
 839         return -EINVAL;
 840 }
 841
 842
 843 static inline void inet_diag_rcv_skb(struct sk_buff *skb)
 844 {
 845         if (skb->len >= NLMSG_SPACE(0)) {
 846                 int err;
 847                 struct nlmsghdr *nlh = (struct nlmsghdr *)skb->data;
 848
 849                 if (nlh->nlmsg_len < sizeof(*nlh) ||
 850                     skb->len < nlh->nlmsg_len)
 851                         return;
 852                 err = inet_diag_rcv_msg(skb, nlh);
 853                 if (err || nlh->nlmsg_flags & NLM_F_ACK)
 854                         netlink_ack(skb, nlh, err);
 855         }
 856 }
 857
 858 static void inet_diag_rcv(struct sock *sk, int len)
 859 {
 860         struct sk_buff *skb;
 861         unsigned int qlen = skb_queue_len(&sk->sk_receive_queue);
 862
 863         while (qlen-- && (skb = skb_dequeue(&sk->sk_receive_queue))) {
 864                 inet_diag_rcv_skb(skb);
 865                 kfree_skb(skb);
 866         }
 867 }
 868
 869 static DEFINE_SPINLOCK(inet_diag_register_lock);
 870
 871 int inet_diag_register(const struct inet_diag_handler *h)
 872 {
 873         const __u16 type = h->idiag_type;
 874         int err = -EINVAL;
 875
 876         if (type >= INET_DIAG_GETSOCK_MAX)
 877                 goto out;
 878
 879         spin_lock(&inet_diag_register_lock);
 880         err = -EEXIST;
 881         if (inet_diag_table[type] == NULL) {
 882                 inet_diag_table[type] = h;
 883                 err = 0;
 884         }
 885         spin_unlock(&inet_diag_register_lock);
 886 out:
 887         return err;
 888 }
 889 EXPORT_SYMBOL_GPL(inet_diag_register);
 890
 891 void inet_diag_unregister(const struct inet_diag_handler *h)
 892 {
 893         const __u16 type = h->idiag_type;
 894
 895         if (type >= INET_DIAG_GETSOCK_MAX)
 896                 return;
 897
 898         spin_lock(&inet_diag_register_lock);
 899         inet_diag_table[type] = NULL;
 900         spin_unlock(&inet_diag_register_lock);
 901
 902         synchronize_rcu();
 903 }
 904 EXPORT_SYMBOL_GPL(inet_diag_unregister);
 905
 906 static int __init inet_diag_init(void)
 907 {
 908         const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX *
 909                                           sizeof(struct inet_diag_handler *));
 910         int err = -ENOMEM;
 911
 912         inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
 913         if (!inet_diag_table)
 914                 goto out;
 915
 916         idiagnl = netlink_kernel_create(NETLINK_INET_DIAG, 0, inet_diag_rcv,
 917                                         THIS_MODULE);
 918         if (idiagnl == NULL)
 919                 goto out_free_table;
 920         err = 0;
 921 out:
 922         return err;
 923 out_free_table:
 924         kfree(inet_diag_table);
 925         goto out;
 926 }
 927
 928 static void __exit inet_diag_exit(void)
 929 {
 930         sock_release(idiagnl->sk_socket);
 931         kfree(inet_diag_table);
 932 }
 933
 934 module_init(inet_diag_init);
 935 module_exit(inet_diag_exit);
 936 MODULE_LICENSE("GPL");