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