git.oblomov.eu Git - linux-2.6/blob - net/ipv4/inet_diag.c

   1 /*
   2  * inet_diag.c  Module for monitoring INET transport protocols sockets.
   3  *
   4  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
   5  *
   6  *      This program is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU General Public License
   8  *      as published by the Free Software Foundation; either version
   9  *      2 of the License, or (at your option) any later version.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/types.h>
  15 #include <linux/fcntl.h>
  16 #include <linux/random.h>
  17 #include <linux/cache.h>
  18 #include <linux/init.h>
  19 #include <linux/time.h>
  20
  21 #include <net/icmp.h>
  22 #include <net/tcp.h>
  23 #include <net/ipv6.h>
  24 #include <net/inet_common.h>
  25 #include <net/inet_connection_sock.h>
  26 #include <net/inet_hashtables.h>
  27 #include <net/inet_timewait_sock.h>
  28 #include <net/inet6_hashtables.h>
  29 #include <net/netlink.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         __be32 *saddr;
  40         __be32 *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 DEFINE_MUTEX(inet_diag_table_mutex);
  53
  54 static const struct inet_diag_handler *inet_diag_lock_handler(int type)
  55 {
  56         if (!inet_diag_table[type])
  57                 request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
  58                                NETLINK_INET_DIAG, type);
  59
  60         mutex_lock(&inet_diag_table_mutex);
  61         if (!inet_diag_table[type])
  62                 return ERR_PTR(-ENOENT);
  63
  64         return inet_diag_table[type];
  65 }
  66
  67 static inline void inet_diag_unlock_handler(
  68         const struct inet_diag_handler *handler)
  69 {
  70         mutex_unlock(&inet_diag_table_mutex);
  71 }
  72
  73 static int inet_csk_diag_fill(struct sock *sk,
  74                               struct sk_buff *skb,
  75                               int ext, u32 pid, u32 seq, u16 nlmsg_flags,
  76                               const struct nlmsghdr *unlh)
  77 {
  78         const struct inet_sock *inet = inet_sk(sk);
  79         const struct inet_connection_sock *icsk = inet_csk(sk);
  80         struct inet_diag_msg *r;
  81         struct nlmsghdr  *nlh;
  82         void *info = NULL;
  83         struct inet_diag_meminfo  *minfo = NULL;
  84         unsigned char    *b = skb_tail_pointer(skb);
  85         const struct inet_diag_handler *handler;
  86
  87         handler = inet_diag_table[unlh->nlmsg_type];
  88         BUG_ON(handler == NULL);
  89
  90         nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
  91         nlh->nlmsg_flags = nlmsg_flags;
  92
  93         r = NLMSG_DATA(nlh);
  94         BUG_ON(sk->sk_state == TCP_TIME_WAIT);
  95
  96         if (ext & (1 << (INET_DIAG_MEMINFO - 1)))
  97                 minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo));
  98
  99         if (ext & (1 << (INET_DIAG_INFO - 1)))
 100                 info = INET_DIAG_PUT(skb, INET_DIAG_INFO,
 101                                      handler->idiag_info_size);
 102
 103         if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) {
 104                 const size_t len = strlen(icsk->icsk_ca_ops->name);
 105
 106                 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1),
 107                        icsk->icsk_ca_ops->name);
 108         }
 109
 110         r->idiag_family = sk->sk_family;
 111         r->idiag_state = sk->sk_state;
 112         r->idiag_timer = 0;
 113         r->idiag_retrans = 0;
 114
 115         r->id.idiag_if = sk->sk_bound_dev_if;
 116         r->id.idiag_cookie[0] = (u32)(unsigned long)sk;
 117         r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
 118
 119         r->id.idiag_sport = inet->sport;
 120         r->id.idiag_dport = inet->dport;
 121         r->id.idiag_src[0] = inet->rcv_saddr;
 122         r->id.idiag_dst[0] = inet->daddr;
 123
 124 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 125         if (r->idiag_family == AF_INET6) {
 126                 struct ipv6_pinfo *np = inet6_sk(sk);
 127
 128                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
 129                                &np->rcv_saddr);
 130                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
 131                                &np->daddr);
 132         }
 133 #endif
 134
 135 #define EXPIRES_IN_MS(tmo)  DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
 136
 137         if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
 138                 r->idiag_timer = 1;
 139                 r->idiag_retrans = icsk->icsk_retransmits;
 140                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
 141         } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
 142                 r->idiag_timer = 4;
 143                 r->idiag_retrans = icsk->icsk_probes_out;
 144                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
 145         } else if (timer_pending(&sk->sk_timer)) {
 146                 r->idiag_timer = 2;
 147                 r->idiag_retrans = icsk->icsk_probes_out;
 148                 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
 149         } else {
 150                 r->idiag_timer = 0;
 151                 r->idiag_expires = 0;
 152         }
 153 #undef EXPIRES_IN_MS
 154
 155         r->idiag_uid = sock_i_uid(sk);
 156         r->idiag_inode = sock_i_ino(sk);
 157
 158         if (minfo) {
 159                 minfo->idiag_rmem = atomic_read(&sk->sk_rmem_alloc);
 160                 minfo->idiag_wmem = sk->sk_wmem_queued;
 161                 minfo->idiag_fmem = sk->sk_forward_alloc;
 162                 minfo->idiag_tmem = atomic_read(&sk->sk_wmem_alloc);
 163         }
 164
 165         handler->idiag_get_info(sk, r, info);
 166
 167         if (sk->sk_state < TCP_TIME_WAIT &&
 168             icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
 169                 icsk->icsk_ca_ops->get_info(sk, ext, skb);
 170
 171         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
 172         return skb->len;
 173
 174 rtattr_failure:
 175 nlmsg_failure:
 176         nlmsg_trim(skb, b);
 177         return -EMSGSIZE;
 178 }
 179
 180 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
 181                                struct sk_buff *skb, int ext, u32 pid,
 182                                u32 seq, u16 nlmsg_flags,
 183                                const struct nlmsghdr *unlh)
 184 {
 185         long tmo;
 186         struct inet_diag_msg *r;
 187         const unsigned char *previous_tail = skb_tail_pointer(skb);
 188         struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq,
 189                                          unlh->nlmsg_type, sizeof(*r));
 190
 191         r = NLMSG_DATA(nlh);
 192         BUG_ON(tw->tw_state != TCP_TIME_WAIT);
 193
 194         nlh->nlmsg_flags = nlmsg_flags;
 195
 196         tmo = tw->tw_ttd - jiffies;
 197         if (tmo < 0)
 198                 tmo = 0;
 199
 200         r->idiag_family       = tw->tw_family;
 201         r->idiag_state        = tw->tw_state;
 202         r->idiag_timer        = 0;
 203         r->idiag_retrans      = 0;
 204         r->id.idiag_if        = tw->tw_bound_dev_if;
 205         r->id.idiag_cookie[0] = (u32)(unsigned long)tw;
 206         r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1);
 207         r->id.idiag_sport     = tw->tw_sport;
 208         r->id.idiag_dport     = tw->tw_dport;
 209         r->id.idiag_src[0]    = tw->tw_rcv_saddr;
 210         r->id.idiag_dst[0]    = tw->tw_daddr;
 211         r->idiag_state        = tw->tw_substate;
 212         r->idiag_timer        = 3;
 213         r->idiag_expires      = DIV_ROUND_UP(tmo * 1000, HZ);
 214         r->idiag_rqueue       = 0;
 215         r->idiag_wqueue       = 0;
 216         r->idiag_uid          = 0;
 217         r->idiag_inode        = 0;
 218 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 219         if (tw->tw_family == AF_INET6) {
 220                 const struct inet6_timewait_sock *tw6 =
 221                                                 inet6_twsk((struct sock *)tw);
 222
 223                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
 224                                &tw6->tw_v6_rcv_saddr);
 225                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
 226                                &tw6->tw_v6_daddr);
 227         }
 228 #endif
 229         nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail;
 230         return skb->len;
 231 nlmsg_failure:
 232         nlmsg_trim(skb, previous_tail);
 233         return -EMSGSIZE;
 234 }
 235
 236 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
 237                         int ext, u32 pid, u32 seq, u16 nlmsg_flags,
 238                         const struct nlmsghdr *unlh)
 239 {
 240         if (sk->sk_state == TCP_TIME_WAIT)
 241                 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
 242                                            skb, ext, pid, seq, nlmsg_flags,
 243                                            unlh);
 244         return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh);
 245 }
 246
 247 static int inet_diag_get_exact(struct sk_buff *in_skb,
 248                                const struct nlmsghdr *nlh)
 249 {
 250         int err;
 251         struct sock *sk;
 252         struct inet_diag_req *req = NLMSG_DATA(nlh);
 253         struct sk_buff *rep;
 254         struct inet_hashinfo *hashinfo;
 255         const struct inet_diag_handler *handler;
 256
 257         handler = inet_diag_lock_handler(nlh->nlmsg_type);
 258         if (IS_ERR(handler)) {
 259                 err = PTR_ERR(handler);
 260                 goto unlock;
 261         }
 262
 263         hashinfo = handler->idiag_hashinfo;
 264         err = -EINVAL;
 265
 266         if (req->idiag_family == AF_INET) {
 267                 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0],
 268                                  req->id.idiag_dport, req->id.idiag_src[0],
 269                                  req->id.idiag_sport, req->id.idiag_if);
 270         }
 271 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 272         else if (req->idiag_family == AF_INET6) {
 273                 sk = inet6_lookup(&init_net, hashinfo,
 274                                   (struct in6_addr *)req->id.idiag_dst,
 275                                   req->id.idiag_dport,
 276                                   (struct in6_addr *)req->id.idiag_src,
 277                                   req->id.idiag_sport,
 278                                   req->id.idiag_if);
 279         }
 280 #endif
 281         else {
 282                 goto unlock;
 283         }
 284
 285         err = -ENOENT;
 286         if (sk == NULL)
 287                 goto unlock;
 288
 289         err = -ESTALE;
 290         if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE ||
 291              req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) &&
 292             ((u32)(unsigned long)sk != req->id.idiag_cookie[0] ||
 293              (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1]))
 294                 goto out;
 295
 296         err = -ENOMEM;
 297         rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
 298                                      sizeof(struct inet_diag_meminfo) +
 299                                      handler->idiag_info_size + 64)),
 300                         GFP_KERNEL);
 301         if (!rep)
 302                 goto out;
 303
 304         err = sk_diag_fill(sk, rep, req->idiag_ext,
 305                            NETLINK_CB(in_skb).pid,
 306                            nlh->nlmsg_seq, 0, nlh);
 307         if (err < 0) {
 308                 WARN_ON(err == -EMSGSIZE);
 309                 kfree_skb(rep);
 310                 goto out;
 311         }
 312         err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid,
 313                               MSG_DONTWAIT);
 314         if (err > 0)
 315                 err = 0;
 316
 317 out:
 318         if (sk) {
 319                 if (sk->sk_state == TCP_TIME_WAIT)
 320                         inet_twsk_put((struct inet_timewait_sock *)sk);
 321                 else
 322                         sock_put(sk);
 323         }
 324 unlock:
 325         inet_diag_unlock_handler(handler);
 326         return err;
 327 }
 328
 329 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
 330 {
 331         int words = bits >> 5;
 332
 333         bits &= 0x1f;
 334
 335         if (words) {
 336                 if (memcmp(a1, a2, words << 2))
 337                         return 0;
 338         }
 339         if (bits) {
 340                 __be32 w1, w2;
 341                 __be32 mask;
 342
 343                 w1 = a1[words];
 344                 w2 = a2[words];
 345
 346                 mask = htonl((0xffffffff) << (32 - bits));
 347
 348                 if ((w1 ^ w2) & mask)
 349                         return 0;
 350         }
 351
 352         return 1;
 353 }
 354
 355
 356 static int inet_diag_bc_run(const void *bc, int len,
 357                             const struct inet_diag_entry *entry)
 358 {
 359         while (len > 0) {
 360                 int yes = 1;
 361                 const struct inet_diag_bc_op *op = bc;
 362
 363                 switch (op->code) {
 364                 case INET_DIAG_BC_NOP:
 365                         break;
 366                 case INET_DIAG_BC_JMP:
 367                         yes = 0;
 368                         break;
 369                 case INET_DIAG_BC_S_GE:
 370                         yes = entry->sport >= op[1].no;
 371                         break;
 372                 case INET_DIAG_BC_S_LE:
 373                         yes = entry->dport <= op[1].no;
 374                         break;
 375                 case INET_DIAG_BC_D_GE:
 376                         yes = entry->dport >= op[1].no;
 377                         break;
 378                 case INET_DIAG_BC_D_LE:
 379                         yes = entry->dport <= op[1].no;
 380                         break;
 381                 case INET_DIAG_BC_AUTO:
 382                         yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
 383                         break;
 384                 case INET_DIAG_BC_S_COND:
 385                 case INET_DIAG_BC_D_COND: {
 386                         struct inet_diag_hostcond *cond;
 387                         __be32 *addr;
 388
 389                         cond = (struct inet_diag_hostcond *)(op + 1);
 390                         if (cond->port != -1 &&
 391                             cond->port != (op->code == INET_DIAG_BC_S_COND ?
 392                                              entry->sport : entry->dport)) {
 393                                 yes = 0;
 394                                 break;
 395                         }
 396
 397                         if (cond->prefix_len == 0)
 398                                 break;
 399
 400                         if (op->code == INET_DIAG_BC_S_COND)
 401                                 addr = entry->saddr;
 402                         else
 403                                 addr = entry->daddr;
 404
 405                         if (bitstring_match(addr, cond->addr,
 406                                             cond->prefix_len))
 407                                 break;
 408                         if (entry->family == AF_INET6 &&
 409                             cond->family == AF_INET) {
 410                                 if (addr[0] == 0 && addr[1] == 0 &&
 411                                     addr[2] == htonl(0xffff) &&
 412                                     bitstring_match(addr + 3, cond->addr,
 413                                                     cond->prefix_len))
 414                                         break;
 415                         }
 416                         yes = 0;
 417                         break;
 418                 }
 419                 }
 420
 421                 if (yes) {
 422                         len -= op->yes;
 423                         bc += op->yes;
 424                 } else {
 425                         len -= op->no;
 426                         bc += op->no;
 427                 }
 428         }
 429         return (len == 0);
 430 }
 431
 432 static int valid_cc(const void *bc, int len, int cc)
 433 {
 434         while (len >= 0) {
 435                 const struct inet_diag_bc_op *op = bc;
 436
 437                 if (cc > len)
 438                         return 0;
 439                 if (cc == len)
 440                         return 1;
 441                 if (op->yes < 4)
 442                         return 0;
 443                 len -= op->yes;
 444                 bc  += op->yes;
 445         }
 446         return 0;
 447 }
 448
 449 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
 450 {
 451         const unsigned char *bc = bytecode;
 452         int  len = bytecode_len;
 453
 454         while (len > 0) {
 455                 struct inet_diag_bc_op *op = (struct inet_diag_bc_op *)bc;
 456
 457 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
 458                 switch (op->code) {
 459                 case INET_DIAG_BC_AUTO:
 460                 case INET_DIAG_BC_S_COND:
 461                 case INET_DIAG_BC_D_COND:
 462                 case INET_DIAG_BC_S_GE:
 463                 case INET_DIAG_BC_S_LE:
 464                 case INET_DIAG_BC_D_GE:
 465                 case INET_DIAG_BC_D_LE:
 466                         if (op->yes < 4 || op->yes > len + 4)
 467                                 return -EINVAL;
 468                 case INET_DIAG_BC_JMP:
 469                         if (op->no < 4 || op->no > len + 4)
 470                                 return -EINVAL;
 471                         if (op->no < len &&
 472                             !valid_cc(bytecode, bytecode_len, len - op->no))
 473                                 return -EINVAL;
 474                         break;
 475                 case INET_DIAG_BC_NOP:
 476                         if (op->yes < 4 || op->yes > len + 4)
 477                                 return -EINVAL;
 478                         break;
 479                 default:
 480                         return -EINVAL;
 481                 }
 482                 bc  += op->yes;
 483                 len -= op->yes;
 484         }
 485         return len == 0 ? 0 : -EINVAL;
 486 }
 487
 488 static int inet_csk_diag_dump(struct sock *sk,
 489                               struct sk_buff *skb,
 490                               struct netlink_callback *cb)
 491 {
 492         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
 493
 494         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
 495                 struct inet_diag_entry entry;
 496                 struct rtattr *bc = (struct rtattr *)(r + 1);
 497                 struct inet_sock *inet = inet_sk(sk);
 498
 499                 entry.family = sk->sk_family;
 500 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 501                 if (entry.family == AF_INET6) {
 502                         struct ipv6_pinfo *np = inet6_sk(sk);
 503
 504                         entry.saddr = np->rcv_saddr.s6_addr32;
 505                         entry.daddr = np->daddr.s6_addr32;
 506                 } else
 507 #endif
 508                 {
 509                         entry.saddr = &inet->rcv_saddr;
 510                         entry.daddr = &inet->daddr;
 511                 }
 512                 entry.sport = inet->num;
 513                 entry.dport = ntohs(inet->dport);
 514                 entry.userlocks = sk->sk_userlocks;
 515
 516                 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
 517                         return 0;
 518         }
 519
 520         return inet_csk_diag_fill(sk, skb, r->idiag_ext,
 521                                   NETLINK_CB(cb->skb).pid,
 522                                   cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
 523 }
 524
 525 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
 526                                struct sk_buff *skb,
 527                                struct netlink_callback *cb)
 528 {
 529         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
 530
 531         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
 532                 struct inet_diag_entry entry;
 533                 struct rtattr *bc = (struct rtattr *)(r + 1);
 534
 535                 entry.family = tw->tw_family;
 536 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 537                 if (tw->tw_family == AF_INET6) {
 538                         struct inet6_timewait_sock *tw6 =
 539                                                 inet6_twsk((struct sock *)tw);
 540                         entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
 541                         entry.daddr = tw6->tw_v6_daddr.s6_addr32;
 542                 } else
 543 #endif
 544                 {
 545                         entry.saddr = &tw->tw_rcv_saddr;
 546                         entry.daddr = &tw->tw_daddr;
 547                 }
 548                 entry.sport = tw->tw_num;
 549                 entry.dport = ntohs(tw->tw_dport);
 550                 entry.userlocks = 0;
 551
 552                 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
 553                         return 0;
 554         }
 555
 556         return inet_twsk_diag_fill(tw, skb, r->idiag_ext,
 557                                    NETLINK_CB(cb->skb).pid,
 558                                    cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
 559 }
 560
 561 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
 562                               struct request_sock *req, u32 pid, u32 seq,
 563                               const struct nlmsghdr *unlh)
 564 {
 565         const struct inet_request_sock *ireq = inet_rsk(req);
 566         struct inet_sock *inet = inet_sk(sk);
 567         unsigned char *b = skb_tail_pointer(skb);
 568         struct inet_diag_msg *r;
 569         struct nlmsghdr *nlh;
 570         long tmo;
 571
 572         nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
 573         nlh->nlmsg_flags = NLM_F_MULTI;
 574         r = NLMSG_DATA(nlh);
 575
 576         r->idiag_family = sk->sk_family;
 577         r->idiag_state = TCP_SYN_RECV;
 578         r->idiag_timer = 1;
 579         r->idiag_retrans = req->retrans;
 580
 581         r->id.idiag_if = sk->sk_bound_dev_if;
 582         r->id.idiag_cookie[0] = (u32)(unsigned long)req;
 583         r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
 584
 585         tmo = req->expires - jiffies;
 586         if (tmo < 0)
 587                 tmo = 0;
 588
 589         r->id.idiag_sport = inet->sport;
 590         r->id.idiag_dport = ireq->rmt_port;
 591         r->id.idiag_src[0] = ireq->loc_addr;
 592         r->id.idiag_dst[0] = ireq->rmt_addr;
 593         r->idiag_expires = jiffies_to_msecs(tmo);
 594         r->idiag_rqueue = 0;
 595         r->idiag_wqueue = 0;
 596         r->idiag_uid = sock_i_uid(sk);
 597         r->idiag_inode = 0;
 598 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 599         if (r->idiag_family == AF_INET6) {
 600                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
 601                                &inet6_rsk(req)->loc_addr);
 602                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
 603                                &inet6_rsk(req)->rmt_addr);
 604         }
 605 #endif
 606         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
 607
 608         return skb->len;
 609
 610 nlmsg_failure:
 611         nlmsg_trim(skb, b);
 612         return -1;
 613 }
 614
 615 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
 616                                struct netlink_callback *cb)
 617 {
 618         struct inet_diag_entry entry;
 619         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
 620         struct inet_connection_sock *icsk = inet_csk(sk);
 621         struct listen_sock *lopt;
 622         struct rtattr *bc = NULL;
 623         struct inet_sock *inet = inet_sk(sk);
 624         int j, s_j;
 625         int reqnum, s_reqnum;
 626         int err = 0;
 627
 628         s_j = cb->args[3];
 629         s_reqnum = cb->args[4];
 630
 631         if (s_j > 0)
 632                 s_j--;
 633
 634         entry.family = sk->sk_family;
 635
 636         read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 637
 638         lopt = icsk->icsk_accept_queue.listen_opt;
 639         if (!lopt || !lopt->qlen)
 640                 goto out;
 641
 642         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
 643                 bc = (struct rtattr *)(r + 1);
 644                 entry.sport = inet->num;
 645                 entry.userlocks = sk->sk_userlocks;
 646         }
 647
 648         for (j = s_j; j < lopt->nr_table_entries; j++) {
 649                 struct request_sock *req, *head = lopt->syn_table[j];
 650
 651                 reqnum = 0;
 652                 for (req = head; req; reqnum++, req = req->dl_next) {
 653                         struct inet_request_sock *ireq = inet_rsk(req);
 654
 655                         if (reqnum < s_reqnum)
 656                                 continue;
 657                         if (r->id.idiag_dport != ireq->rmt_port &&
 658                             r->id.idiag_dport)
 659                                 continue;
 660
 661                         if (bc) {
 662                                 entry.saddr =
 663 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 664                                         (entry.family == AF_INET6) ?
 665                                         inet6_rsk(req)->loc_addr.s6_addr32 :
 666 #endif
 667                                         &ireq->loc_addr;
 668                                 entry.daddr =
 669 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 670                                         (entry.family == AF_INET6) ?
 671                                         inet6_rsk(req)->rmt_addr.s6_addr32 :
 672 #endif
 673                                         &ireq->rmt_addr;
 674                                 entry.dport = ntohs(ireq->rmt_port);
 675
 676                                 if (!inet_diag_bc_run(RTA_DATA(bc),
 677                                                     RTA_PAYLOAD(bc), &entry))
 678                                         continue;
 679                         }
 680
 681                         err = inet_diag_fill_req(skb, sk, req,
 682                                                NETLINK_CB(cb->skb).pid,
 683                                                cb->nlh->nlmsg_seq, cb->nlh);
 684                         if (err < 0) {
 685                                 cb->args[3] = j + 1;
 686                                 cb->args[4] = reqnum;
 687                                 goto out;
 688                         }
 689                 }
 690
 691                 s_reqnum = 0;
 692         }
 693
 694 out:
 695         read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 696
 697         return err;
 698 }
 699
 700 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
 701 {
 702         int i, num;
 703         int s_i, s_num;
 704         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
 705         const struct inet_diag_handler *handler;
 706         struct inet_hashinfo *hashinfo;
 707
 708         handler = inet_diag_lock_handler(cb->nlh->nlmsg_type);
 709         if (IS_ERR(handler))
 710                 goto unlock;
 711
 712         hashinfo = handler->idiag_hashinfo;
 713
 714         s_i = cb->args[1];
 715         s_num = num = cb->args[2];
 716
 717         if (cb->args[0] == 0) {
 718                 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
 719                         goto skip_listen_ht;
 720
 721                 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
 722                         struct sock *sk;
 723                         struct hlist_nulls_node *node;
 724                         struct inet_listen_hashbucket *ilb;
 725
 726                         num = 0;
 727                         ilb = &hashinfo->listening_hash[i];
 728                         spin_lock_bh(&ilb->lock);
 729                         sk_nulls_for_each(sk, node, &ilb->head) {
 730                                 struct inet_sock *inet = inet_sk(sk);
 731
 732                                 if (num < s_num) {
 733                                         num++;
 734                                         continue;
 735                                 }
 736
 737                                 if (r->id.idiag_sport != inet->sport &&
 738                                     r->id.idiag_sport)
 739                                         goto next_listen;
 740
 741                                 if (!(r->idiag_states & TCPF_LISTEN) ||
 742                                     r->id.idiag_dport ||
 743                                     cb->args[3] > 0)
 744                                         goto syn_recv;
 745
 746                                 if (inet_csk_diag_dump(sk, skb, cb) < 0) {
 747                                         spin_unlock_bh(&ilb->lock);
 748                                         goto done;
 749                                 }
 750
 751 syn_recv:
 752                                 if (!(r->idiag_states & TCPF_SYN_RECV))
 753                                         goto next_listen;
 754
 755                                 if (inet_diag_dump_reqs(skb, sk, cb) < 0) {
 756                                         spin_unlock_bh(&ilb->lock);
 757                                         goto done;
 758                                 }
 759
 760 next_listen:
 761                                 cb->args[3] = 0;
 762                                 cb->args[4] = 0;
 763                                 ++num;
 764                         }
 765                         spin_unlock_bh(&ilb->lock);
 766
 767                         s_num = 0;
 768                         cb->args[3] = 0;
 769                         cb->args[4] = 0;
 770                 }
 771 skip_listen_ht:
 772                 cb->args[0] = 1;
 773                 s_i = num = s_num = 0;
 774         }
 775
 776         if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
 777                 goto unlock;
 778
 779         for (i = s_i; i < hashinfo->ehash_size; i++) {
 780                 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
 781                 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
 782                 struct sock *sk;
 783                 struct hlist_nulls_node *node;
 784
 785                 num = 0;
 786
 787                 if (hlist_nulls_empty(&head->chain) &&
 788                         hlist_nulls_empty(&head->twchain))
 789                         continue;
 790
 791                 if (i > s_i)
 792                         s_num = 0;
 793
 794                 spin_lock_bh(lock);
 795                 sk_nulls_for_each(sk, node, &head->chain) {
 796                         struct inet_sock *inet = inet_sk(sk);
 797
 798                         if (num < s_num)
 799                                 goto next_normal;
 800                         if (!(r->idiag_states & (1 << sk->sk_state)))
 801                                 goto next_normal;
 802                         if (r->id.idiag_sport != inet->sport &&
 803                             r->id.idiag_sport)
 804                                 goto next_normal;
 805                         if (r->id.idiag_dport != inet->dport &&
 806                             r->id.idiag_dport)
 807                                 goto next_normal;
 808                         if (inet_csk_diag_dump(sk, skb, cb) < 0) {
 809                                 spin_unlock_bh(lock);
 810                                 goto done;
 811                         }
 812 next_normal:
 813                         ++num;
 814                 }
 815
 816                 if (r->idiag_states & TCPF_TIME_WAIT) {
 817                         struct inet_timewait_sock *tw;
 818
 819                         inet_twsk_for_each(tw, node,
 820                                     &head->twchain) {
 821
 822                                 if (num < s_num)
 823                                         goto next_dying;
 824                                 if (r->id.idiag_sport != tw->tw_sport &&
 825                                     r->id.idiag_sport)
 826                                         goto next_dying;
 827                                 if (r->id.idiag_dport != tw->tw_dport &&
 828                                     r->id.idiag_dport)
 829                                         goto next_dying;
 830                                 if (inet_twsk_diag_dump(tw, skb, cb) < 0) {
 831                                         spin_unlock_bh(lock);
 832                                         goto done;
 833                                 }
 834 next_dying:
 835                                 ++num;
 836                         }
 837                 }
 838                 spin_unlock_bh(lock);
 839         }
 840
 841 done:
 842         cb->args[1] = i;
 843         cb->args[2] = num;
 844 unlock:
 845         inet_diag_unlock_handler(handler);
 846         return skb->len;
 847 }
 848
 849 static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
 850 {
 851         int hdrlen = sizeof(struct inet_diag_req);
 852
 853         if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
 854             nlmsg_len(nlh) < hdrlen)
 855                 return -EINVAL;
 856
 857         if (nlh->nlmsg_flags & NLM_F_DUMP) {
 858                 if (nlmsg_attrlen(nlh, hdrlen)) {
 859                         struct nlattr *attr;
 860
 861                         attr = nlmsg_find_attr(nlh, hdrlen,
 862                                                INET_DIAG_REQ_BYTECODE);
 863                         if (attr == NULL ||
 864                             nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
 865                             inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
 866                                 return -EINVAL;
 867                 }
 868
 869                 return netlink_dump_start(idiagnl, skb, nlh,
 870                                           inet_diag_dump, NULL);
 871         }
 872
 873         return inet_diag_get_exact(skb, nlh);
 874 }
 875
 876 static DEFINE_MUTEX(inet_diag_mutex);
 877
 878 static void inet_diag_rcv(struct sk_buff *skb)
 879 {
 880         mutex_lock(&inet_diag_mutex);
 881         netlink_rcv_skb(skb, &inet_diag_rcv_msg);
 882         mutex_unlock(&inet_diag_mutex);
 883 }
 884
 885 int inet_diag_register(const struct inet_diag_handler *h)
 886 {
 887         const __u16 type = h->idiag_type;
 888         int err = -EINVAL;
 889
 890         if (type >= INET_DIAG_GETSOCK_MAX)
 891                 goto out;
 892
 893         mutex_lock(&inet_diag_table_mutex);
 894         err = -EEXIST;
 895         if (inet_diag_table[type] == NULL) {
 896                 inet_diag_table[type] = h;
 897                 err = 0;
 898         }
 899         mutex_unlock(&inet_diag_table_mutex);
 900 out:
 901         return err;
 902 }
 903 EXPORT_SYMBOL_GPL(inet_diag_register);
 904
 905 void inet_diag_unregister(const struct inet_diag_handler *h)
 906 {
 907         const __u16 type = h->idiag_type;
 908
 909         if (type >= INET_DIAG_GETSOCK_MAX)
 910                 return;
 911
 912         mutex_lock(&inet_diag_table_mutex);
 913         inet_diag_table[type] = NULL;
 914         mutex_unlock(&inet_diag_table_mutex);
 915 }
 916 EXPORT_SYMBOL_GPL(inet_diag_unregister);
 917
 918 static int __init inet_diag_init(void)
 919 {
 920         const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX *
 921                                           sizeof(struct inet_diag_handler *));
 922         int err = -ENOMEM;
 923
 924         inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
 925         if (!inet_diag_table)
 926                 goto out;
 927
 928         idiagnl = netlink_kernel_create(&init_net, NETLINK_INET_DIAG, 0,
 929                                         inet_diag_rcv, NULL, THIS_MODULE);
 930         if (idiagnl == NULL)
 931                 goto out_free_table;
 932         err = 0;
 933 out:
 934         return err;
 935 out_free_table:
 936         kfree(inet_diag_table);
 937         goto out;
 938 }
 939
 940 static void __exit inet_diag_exit(void)
 941 {
 942         netlink_kernel_release(idiagnl);
 943         kfree(inet_diag_table);
 944 }
 945
 946 module_init(inet_diag_init);
 947 module_exit(inet_diag_exit);
 948 MODULE_LICENSE("GPL");
 949 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_INET_DIAG);