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         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 inet_diag_get_exact(struct sk_buff *in_skb,
 216                                const struct nlmsghdr *nlh)
 217 {
 218         int err;
 219         struct sock *sk;
 220         struct inet_diag_req *req = NLMSG_DATA(nlh);
 221         struct sk_buff *rep;
 222         struct inet_hashinfo *hashinfo;
 223         const struct inet_diag_handler *handler;
 224
 225         handler = inet_diag_table[nlh->nlmsg_type];
 226         BUG_ON(handler == NULL);
 227         hashinfo = handler->idiag_hashinfo;
 228
 229         if (req->idiag_family == AF_INET) {
 230                 sk = inet_lookup(hashinfo, req->id.idiag_dst[0],
 231                                  req->id.idiag_dport, req->id.idiag_src[0],
 232                                  req->id.idiag_sport, req->id.idiag_if);
 233         }
 234 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 235         else if (req->idiag_family == AF_INET6) {
 236                 sk = inet6_lookup(hashinfo,
 237                                   (struct in6_addr *)req->id.idiag_dst,
 238                                   req->id.idiag_dport,
 239                                   (struct in6_addr *)req->id.idiag_src,
 240                                   req->id.idiag_sport,
 241                                   req->id.idiag_if);
 242         }
 243 #endif
 244         else {
 245                 return -EINVAL;
 246         }
 247
 248         if (sk == NULL)
 249                 return -ENOENT;
 250
 251         err = -ESTALE;
 252         if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE ||
 253              req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) &&
 254             ((u32)(unsigned long)sk != req->id.idiag_cookie[0] ||
 255              (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1]))
 256                 goto out;
 257
 258         err = -ENOMEM;
 259         rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
 260                                      sizeof(struct inet_diag_meminfo) +
 261                                      handler->idiag_info_size + 64)),
 262                         GFP_KERNEL);
 263         if (!rep)
 264                 goto out;
 265
 266         if (inet_diag_fill(rep, sk, req->idiag_ext,
 267                          NETLINK_CB(in_skb).pid,
 268                          nlh->nlmsg_seq, 0, nlh) <= 0)
 269                 BUG();
 270
 271         err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid,
 272                               MSG_DONTWAIT);
 273         if (err > 0)
 274                 err = 0;
 275
 276 out:
 277         if (sk) {
 278                 if (sk->sk_state == TCP_TIME_WAIT)
 279                         inet_twsk_put((struct inet_timewait_sock *)sk);
 280                 else
 281                         sock_put(sk);
 282         }
 283         return err;
 284 }
 285
 286 static int bitstring_match(const u32 *a1, const u32 *a2, int bits)
 287 {
 288         int words = bits >> 5;
 289
 290         bits &= 0x1f;
 291
 292         if (words) {
 293                 if (memcmp(a1, a2, words << 2))
 294                         return 0;
 295         }
 296         if (bits) {
 297                 __u32 w1, w2;
 298                 __u32 mask;
 299
 300                 w1 = a1[words];
 301                 w2 = a2[words];
 302
 303                 mask = htonl((0xffffffff) << (32 - bits));
 304
 305                 if ((w1 ^ w2) & mask)
 306                         return 0;
 307         }
 308
 309         return 1;
 310 }
 311
 312
 313 static int inet_diag_bc_run(const void *bc, int len,
 314                             const struct inet_diag_entry *entry)
 315 {
 316         while (len > 0) {
 317                 int yes = 1;
 318                 const struct inet_diag_bc_op *op = bc;
 319
 320                 switch (op->code) {
 321                 case INET_DIAG_BC_NOP:
 322                         break;
 323                 case INET_DIAG_BC_JMP:
 324                         yes = 0;
 325                         break;
 326                 case INET_DIAG_BC_S_GE:
 327                         yes = entry->sport >= op[1].no;
 328                         break;
 329                 case INET_DIAG_BC_S_LE:
 330                         yes = entry->dport <= op[1].no;
 331                         break;
 332                 case INET_DIAG_BC_D_GE:
 333                         yes = entry->dport >= op[1].no;
 334                         break;
 335                 case INET_DIAG_BC_D_LE:
 336                         yes = entry->dport <= op[1].no;
 337                         break;
 338                 case INET_DIAG_BC_AUTO:
 339                         yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
 340                         break;
 341                 case INET_DIAG_BC_S_COND:
 342                 case INET_DIAG_BC_D_COND: {
 343                         struct inet_diag_hostcond *cond;
 344                         u32 *addr;
 345
 346                         cond = (struct inet_diag_hostcond *)(op + 1);
 347                         if (cond->port != -1 &&
 348                             cond->port != (op->code == INET_DIAG_BC_S_COND ?
 349                                              entry->sport : entry->dport)) {
 350                                 yes = 0;
 351                                 break;
 352                         }
 353
 354                         if (cond->prefix_len == 0)
 355                                 break;
 356
 357                         if (op->code == INET_DIAG_BC_S_COND)
 358                                 addr = entry->saddr;
 359                         else
 360                                 addr = entry->daddr;
 361
 362                         if (bitstring_match(addr, cond->addr,
 363                                             cond->prefix_len))
 364                                 break;
 365                         if (entry->family == AF_INET6 &&
 366                             cond->family == AF_INET) {
 367                                 if (addr[0] == 0 && addr[1] == 0 &&
 368                                     addr[2] == htonl(0xffff) &&
 369                                     bitstring_match(addr + 3, cond->addr,
 370                                                     cond->prefix_len))
 371                                         break;
 372                         }
 373                         yes = 0;
 374                         break;
 375                 }
 376                 }
 377
 378                 if (yes) {
 379                         len -= op->yes;
 380                         bc += op->yes;
 381                 } else {
 382                         len -= op->no;
 383                         bc += op->no;
 384                 }
 385         }
 386         return (len == 0);
 387 }
 388
 389 static int valid_cc(const void *bc, int len, int cc)
 390 {
 391         while (len >= 0) {
 392                 const struct inet_diag_bc_op *op = bc;
 393
 394                 if (cc > len)
 395                         return 0;
 396                 if (cc == len)
 397                         return 1;
 398                 if (op->yes < 4)
 399                         return 0;
 400                 len -= op->yes;
 401                 bc  += op->yes;
 402         }
 403         return 0;
 404 }
 405
 406 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
 407 {
 408         const unsigned char *bc = bytecode;
 409         int  len = bytecode_len;
 410
 411         while (len > 0) {
 412                 struct inet_diag_bc_op *op = (struct inet_diag_bc_op *)bc;
 413
 414 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
 415                 switch (op->code) {
 416                 case INET_DIAG_BC_AUTO:
 417                 case INET_DIAG_BC_S_COND:
 418                 case INET_DIAG_BC_D_COND:
 419                 case INET_DIAG_BC_S_GE:
 420                 case INET_DIAG_BC_S_LE:
 421                 case INET_DIAG_BC_D_GE:
 422                 case INET_DIAG_BC_D_LE:
 423                         if (op->yes < 4 || op->yes > len + 4)
 424                                 return -EINVAL;
 425                 case INET_DIAG_BC_JMP:
 426                         if (op->no < 4 || op->no > len + 4)
 427                                 return -EINVAL;
 428                         if (op->no < len &&
 429                             !valid_cc(bytecode, bytecode_len, len - op->no))
 430                                 return -EINVAL;
 431                         break;
 432                 case INET_DIAG_BC_NOP:
 433                         if (op->yes < 4 || op->yes > len + 4)
 434                                 return -EINVAL;
 435                         break;
 436                 default:
 437                         return -EINVAL;
 438                 }
 439                 bc  += op->yes;
 440                 len -= op->yes;
 441         }
 442         return len == 0 ? 0 : -EINVAL;
 443 }
 444
 445 static int inet_diag_dump_sock(struct sk_buff *skb, struct sock *sk,
 446                                struct netlink_callback *cb)
 447 {
 448         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
 449
 450         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
 451                 struct inet_diag_entry entry;
 452                 struct rtattr *bc = (struct rtattr *)(r + 1);
 453                 struct inet_sock *inet = inet_sk(sk);
 454
 455                 entry.family = sk->sk_family;
 456 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 457                 if (entry.family == AF_INET6) {
 458                         struct ipv6_pinfo *np = inet6_sk(sk);
 459
 460                         entry.saddr = np->rcv_saddr.s6_addr32;
 461                         entry.daddr = np->daddr.s6_addr32;
 462                 } else
 463 #endif
 464                 {
 465                         entry.saddr = &inet->rcv_saddr;
 466                         entry.daddr = &inet->daddr;
 467                 }
 468                 entry.sport = inet->num;
 469                 entry.dport = ntohs(inet->dport);
 470                 entry.userlocks = sk->sk_userlocks;
 471
 472                 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
 473                         return 0;
 474         }
 475
 476         return inet_diag_fill(skb, sk, r->idiag_ext, NETLINK_CB(cb->skb).pid,
 477                               cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
 478 }
 479
 480 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
 481                                struct sk_buff *skb,
 482                                struct netlink_callback *cb)
 483 {
 484         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
 485
 486         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
 487                 struct inet_diag_entry entry;
 488                 struct rtattr *bc = (struct rtattr *)(r + 1);
 489
 490                 entry.family = tw->tw_family;
 491 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 492                 if (tw->tw_family == AF_INET6) {
 493                         struct inet6_timewait_sock *tw6 =
 494                                                 inet6_twsk((struct sock *)tw);
 495                         entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
 496                         entry.daddr = tw6->tw_v6_daddr.s6_addr32;
 497                 } else
 498 #endif
 499                 {
 500                         entry.saddr = &tw->tw_rcv_saddr;
 501                         entry.daddr = &tw->tw_daddr;
 502                 }
 503                 entry.sport = tw->tw_num;
 504                 entry.dport = ntohs(tw->tw_dport);
 505                 entry.userlocks = 0;
 506
 507                 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
 508                         return 0;
 509         }
 510
 511         return inet_twsk_diag_fill(tw, skb, r->idiag_ext,
 512                                    NETLINK_CB(cb->skb).pid,
 513                                    cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
 514 }
 515
 516 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
 517                               struct request_sock *req, u32 pid, u32 seq,
 518                               const struct nlmsghdr *unlh)
 519 {
 520         const struct inet_request_sock *ireq = inet_rsk(req);
 521         struct inet_sock *inet = inet_sk(sk);
 522         unsigned char *b = skb->tail;
 523         struct inet_diag_msg *r;
 524         struct nlmsghdr *nlh;
 525         long tmo;
 526
 527         nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
 528         nlh->nlmsg_flags = NLM_F_MULTI;
 529         r = NLMSG_DATA(nlh);
 530
 531         r->idiag_family = sk->sk_family;
 532         r->idiag_state = TCP_SYN_RECV;
 533         r->idiag_timer = 1;
 534         r->idiag_retrans = req->retrans;
 535
 536         r->id.idiag_if = sk->sk_bound_dev_if;
 537         r->id.idiag_cookie[0] = (u32)(unsigned long)req;
 538         r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
 539
 540         tmo = req->expires - jiffies;
 541         if (tmo < 0)
 542                 tmo = 0;
 543
 544         r->id.idiag_sport = inet->sport;
 545         r->id.idiag_dport = ireq->rmt_port;
 546         r->id.idiag_src[0] = ireq->loc_addr;
 547         r->id.idiag_dst[0] = ireq->rmt_addr;
 548         r->idiag_expires = jiffies_to_msecs(tmo);
 549         r->idiag_rqueue = 0;
 550         r->idiag_wqueue = 0;
 551         r->idiag_uid = sock_i_uid(sk);
 552         r->idiag_inode = 0;
 553 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 554         if (r->idiag_family == AF_INET6) {
 555                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
 556                                &inet6_rsk(req)->loc_addr);
 557                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
 558                                &inet6_rsk(req)->rmt_addr);
 559         }
 560 #endif
 561         nlh->nlmsg_len = skb->tail - b;
 562
 563         return skb->len;
 564
 565 nlmsg_failure:
 566         skb_trim(skb, b - skb->data);
 567         return -1;
 568 }
 569
 570 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
 571                                struct netlink_callback *cb)
 572 {
 573         struct inet_diag_entry entry;
 574         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
 575         struct inet_connection_sock *icsk = inet_csk(sk);
 576         struct listen_sock *lopt;
 577         struct rtattr *bc = NULL;
 578         struct inet_sock *inet = inet_sk(sk);
 579         int j, s_j;
 580         int reqnum, s_reqnum;
 581         int err = 0;
 582
 583         s_j = cb->args[3];
 584         s_reqnum = cb->args[4];
 585
 586         if (s_j > 0)
 587                 s_j--;
 588
 589         entry.family = sk->sk_family;
 590
 591         read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 592
 593         lopt = icsk->icsk_accept_queue.listen_opt;
 594         if (!lopt || !lopt->qlen)
 595                 goto out;
 596
 597         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
 598                 bc = (struct rtattr *)(r + 1);
 599                 entry.sport = inet->num;
 600                 entry.userlocks = sk->sk_userlocks;
 601         }
 602
 603         for (j = s_j; j < lopt->nr_table_entries; j++) {
 604                 struct request_sock *req, *head = lopt->syn_table[j];
 605
 606                 reqnum = 0;
 607                 for (req = head; req; reqnum++, req = req->dl_next) {
 608                         struct inet_request_sock *ireq = inet_rsk(req);
 609
 610                         if (reqnum < s_reqnum)
 611                                 continue;
 612                         if (r->id.idiag_dport != ireq->rmt_port &&
 613                             r->id.idiag_dport)
 614                                 continue;
 615
 616                         if (bc) {
 617                                 entry.saddr =
 618 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 619                                         (entry.family == AF_INET6) ?
 620                                         inet6_rsk(req)->loc_addr.s6_addr32 :
 621 #endif
 622                                         &ireq->loc_addr;
 623                                 entry.daddr =
 624 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 625                                         (entry.family == AF_INET6) ?
 626                                         inet6_rsk(req)->rmt_addr.s6_addr32 :
 627 #endif
 628                                         &ireq->rmt_addr;
 629                                 entry.dport = ntohs(ireq->rmt_port);
 630
 631                                 if (!inet_diag_bc_run(RTA_DATA(bc),
 632                                                     RTA_PAYLOAD(bc), &entry))
 633                                         continue;
 634                         }
 635
 636                         err = inet_diag_fill_req(skb, sk, req,
 637                                                NETLINK_CB(cb->skb).pid,
 638                                                cb->nlh->nlmsg_seq, cb->nlh);
 639                         if (err < 0) {
 640                                 cb->args[3] = j + 1;
 641                                 cb->args[4] = reqnum;
 642                                 goto out;
 643                         }
 644                 }
 645
 646                 s_reqnum = 0;
 647         }
 648
 649 out:
 650         read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 651
 652         return err;
 653 }
 654
 655 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
 656 {
 657         int i, num;
 658         int s_i, s_num;
 659         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
 660         const struct inet_diag_handler *handler;
 661         struct inet_hashinfo *hashinfo;
 662
 663         handler = inet_diag_table[cb->nlh->nlmsg_type];
 664         BUG_ON(handler == NULL);
 665         hashinfo = handler->idiag_hashinfo;
 666
 667         s_i = cb->args[1];
 668         s_num = num = cb->args[2];
 669
 670         if (cb->args[0] == 0) {
 671                 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
 672                         goto skip_listen_ht;
 673
 674                 inet_listen_lock(hashinfo);
 675                 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
 676                         struct sock *sk;
 677                         struct hlist_node *node;
 678
 679                         num = 0;
 680                         sk_for_each(sk, node, &hashinfo->listening_hash[i]) {
 681                                 struct inet_sock *inet = inet_sk(sk);
 682
 683                                 if (num < s_num) {
 684                                         num++;
 685                                         continue;
 686                                 }
 687
 688                                 if (r->id.idiag_sport != inet->sport &&
 689                                     r->id.idiag_sport)
 690                                         goto next_listen;
 691
 692                                 if (!(r->idiag_states & TCPF_LISTEN) ||
 693                                     r->id.idiag_dport ||
 694                                     cb->args[3] > 0)
 695                                         goto syn_recv;
 696
 697                                 if (inet_diag_dump_sock(skb, sk, cb) < 0) {
 698                                         inet_listen_unlock(hashinfo);
 699                                         goto done;
 700                                 }
 701
 702 syn_recv:
 703                                 if (!(r->idiag_states & TCPF_SYN_RECV))
 704                                         goto next_listen;
 705
 706                                 if (inet_diag_dump_reqs(skb, sk, cb) < 0) {
 707                                         inet_listen_unlock(hashinfo);
 708                                         goto done;
 709                                 }
 710
 711 next_listen:
 712                                 cb->args[3] = 0;
 713                                 cb->args[4] = 0;
 714                                 ++num;
 715                         }
 716
 717                         s_num = 0;
 718                         cb->args[3] = 0;
 719                         cb->args[4] = 0;
 720                 }
 721                 inet_listen_unlock(hashinfo);
 722 skip_listen_ht:
 723                 cb->args[0] = 1;
 724                 s_i = num = s_num = 0;
 725         }
 726
 727         if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
 728                 return skb->len;
 729
 730         for (i = s_i; i < hashinfo->ehash_size; i++) {
 731                 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
 732                 struct sock *sk;
 733                 struct hlist_node *node;
 734
 735                 if (i > s_i)
 736                         s_num = 0;
 737
 738                 read_lock_bh(&head->lock);
 739                 num = 0;
 740                 sk_for_each(sk, node, &head->chain) {
 741                         struct inet_sock *inet = inet_sk(sk);
 742
 743                         if (num < s_num)
 744                                 goto next_normal;
 745                         if (!(r->idiag_states & (1 << sk->sk_state)))
 746                                 goto next_normal;
 747                         if (r->id.idiag_sport != inet->sport &&
 748                             r->id.idiag_sport)
 749                                 goto next_normal;
 750                         if (r->id.idiag_dport != inet->dport &&
 751                             r->id.idiag_dport)
 752                                 goto next_normal;
 753                         if (inet_diag_dump_sock(skb, sk, cb) < 0) {
 754                                 read_unlock_bh(&head->lock);
 755                                 goto done;
 756                         }
 757 next_normal:
 758                         ++num;
 759                 }
 760
 761                 if (r->idiag_states & TCPF_TIME_WAIT) {
 762                         struct inet_timewait_sock *tw;
 763
 764                         inet_twsk_for_each(tw, node,
 765                                     &hashinfo->ehash[i + hashinfo->ehash_size].chain) {
 766
 767                                 if (num < s_num)
 768                                         goto next_dying;
 769                                 if (r->id.idiag_sport != tw->tw_sport &&
 770                                     r->id.idiag_sport)
 771                                         goto next_dying;
 772                                 if (r->id.idiag_dport != tw->tw_dport &&
 773                                     r->id.idiag_dport)
 774                                         goto next_dying;
 775                                 if (inet_twsk_diag_dump(tw, skb, cb) < 0) {
 776                                         read_unlock_bh(&head->lock);
 777                                         goto done;
 778                                 }
 779 next_dying:
 780                                 ++num;
 781                         }
 782                 }
 783                 read_unlock_bh(&head->lock);
 784         }
 785
 786 done:
 787         cb->args[1] = i;
 788         cb->args[2] = num;
 789         return skb->len;
 790 }
 791
 792 static inline int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
 793 {
 794         if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
 795                 return 0;
 796
 797         if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX)
 798                 goto err_inval;
 799
 800         if (inet_diag_table[nlh->nlmsg_type] == NULL)
 801                 return -ENOENT;
 802
 803         if (NLMSG_LENGTH(sizeof(struct inet_diag_req)) > skb->len)
 804                 goto err_inval;
 805
 806         if (nlh->nlmsg_flags&NLM_F_DUMP) {
 807                 if (nlh->nlmsg_len >
 808                     (4 + NLMSG_SPACE(sizeof(struct inet_diag_req)))) {
 809                         struct rtattr *rta = (void *)(NLMSG_DATA(nlh) +
 810                                                  sizeof(struct inet_diag_req));
 811                         if (rta->rta_type != INET_DIAG_REQ_BYTECODE ||
 812                             rta->rta_len < 8 ||
 813                             rta->rta_len >
 814                             (nlh->nlmsg_len -
 815                              NLMSG_SPACE(sizeof(struct inet_diag_req))))
 816                                 goto err_inval;
 817                         if (inet_diag_bc_audit(RTA_DATA(rta), RTA_PAYLOAD(rta)))
 818                                 goto err_inval;
 819                 }
 820                 return netlink_dump_start(idiagnl, skb, nlh,
 821                                           inet_diag_dump, NULL);
 822         } else
 823                 return inet_diag_get_exact(skb, nlh);
 824
 825 err_inval:
 826         return -EINVAL;
 827 }
 828
 829
 830 static inline void inet_diag_rcv_skb(struct sk_buff *skb)
 831 {
 832         if (skb->len >= NLMSG_SPACE(0)) {
 833                 int err;
 834                 struct nlmsghdr *nlh = (struct nlmsghdr *)skb->data;
 835
 836                 if (nlh->nlmsg_len < sizeof(*nlh) ||
 837                     skb->len < nlh->nlmsg_len)
 838                         return;
 839                 err = inet_diag_rcv_msg(skb, nlh);
 840                 if (err || nlh->nlmsg_flags & NLM_F_ACK)
 841                         netlink_ack(skb, nlh, err);
 842         }
 843 }
 844
 845 static void inet_diag_rcv(struct sock *sk, int len)
 846 {
 847         struct sk_buff *skb;
 848         unsigned int qlen = skb_queue_len(&sk->sk_receive_queue);
 849
 850         while (qlen-- && (skb = skb_dequeue(&sk->sk_receive_queue))) {
 851                 inet_diag_rcv_skb(skb);
 852                 kfree_skb(skb);
 853         }
 854 }
 855
 856 static DEFINE_SPINLOCK(inet_diag_register_lock);
 857
 858 int inet_diag_register(const struct inet_diag_handler *h)
 859 {
 860         const __u16 type = h->idiag_type;
 861         int err = -EINVAL;
 862
 863         if (type >= INET_DIAG_GETSOCK_MAX)
 864                 goto out;
 865
 866         spin_lock(&inet_diag_register_lock);
 867         err = -EEXIST;
 868         if (inet_diag_table[type] == NULL) {
 869                 inet_diag_table[type] = h;
 870                 err = 0;
 871         }
 872         spin_unlock(&inet_diag_register_lock);
 873 out:
 874         return err;
 875 }
 876 EXPORT_SYMBOL_GPL(inet_diag_register);
 877
 878 void inet_diag_unregister(const struct inet_diag_handler *h)
 879 {
 880         const __u16 type = h->idiag_type;
 881
 882         if (type >= INET_DIAG_GETSOCK_MAX)
 883                 return;
 884
 885         spin_lock(&inet_diag_register_lock);
 886         inet_diag_table[type] = NULL;
 887         spin_unlock(&inet_diag_register_lock);
 888
 889         synchronize_rcu();
 890 }
 891 EXPORT_SYMBOL_GPL(inet_diag_unregister);
 892
 893 static int __init inet_diag_init(void)
 894 {
 895         const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX *
 896                                           sizeof(struct inet_diag_handler *));
 897         int err = -ENOMEM;
 898
 899         inet_diag_table = kmalloc(inet_diag_table_size, GFP_KERNEL);
 900         if (!inet_diag_table)
 901                 goto out;
 902
 903         memset(inet_diag_table, 0, inet_diag_table_size);
 904         idiagnl = netlink_kernel_create(NETLINK_INET_DIAG, 0, inet_diag_rcv,
 905                                         THIS_MODULE);
 906         if (idiagnl == NULL)
 907                 goto out_free_table;
 908         err = 0;
 909 out:
 910         return err;
 911 out_free_table:
 912         kfree(inet_diag_table);
 913         goto out;
 914 }
 915
 916 static void __exit inet_diag_exit(void)
 917 {
 918         sock_release(idiagnl->sk_socket);
 919         kfree(inet_diag_table);
 920 }
 921
 922 module_init(inet_diag_init);
 923 module_exit(inet_diag_exit);
 924 MODULE_LICENSE("GPL");