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/kernel.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 #include <net/netlink.h>
  32
  33 #include <linux/inet.h>
  34 #include <linux/stddef.h>
  35
  36 #include <linux/inet_diag.h>
  37
  38 static const struct inet_diag_handler **inet_diag_table;
  39
  40 struct inet_diag_entry {
  41         __be32 *saddr;
  42         __be32 *daddr;
  43         u16 sport;
  44         u16 dport;
  45         u16 family;
  46         u16 userlocks;
  47 };
  48
  49 static struct sock *idiagnl;
  50
  51 #define INET_DIAG_PUT(skb, attrtype, attrlen) \
  52         RTA_DATA(__RTA_PUT(skb, attrtype, attrlen))
  53
  54 static DEFINE_MUTEX(inet_diag_table_mutex);
  55
  56 static const struct inet_diag_handler *inet_diag_lock_handler(int type)
  57 {
  58 #ifdef CONFIG_KMOD
  59         if (!inet_diag_table[type])
  60                 request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
  61                                NETLINK_INET_DIAG, type);
  62 #endif
  63
  64         mutex_lock(&inet_diag_table_mutex);
  65         if (!inet_diag_table[type])
  66                 return ERR_PTR(-ENOENT);
  67
  68         return inet_diag_table[type];
  69 }
  70
  71 static inline void inet_diag_unlock_handler(
  72         const struct inet_diag_handler *handler)
  73 {
  74         mutex_unlock(&inet_diag_table_mutex);
  75 }
  76
  77 static int inet_csk_diag_fill(struct sock *sk,
  78                               struct sk_buff *skb,
  79                               int ext, u32 pid, u32 seq, u16 nlmsg_flags,
  80                               const struct nlmsghdr *unlh)
  81 {
  82         const struct inet_sock *inet = inet_sk(sk);
  83         const struct inet_connection_sock *icsk = inet_csk(sk);
  84         struct inet_diag_msg *r;
  85         struct nlmsghdr  *nlh;
  86         void *info = NULL;
  87         struct inet_diag_meminfo  *minfo = NULL;
  88         unsigned char    *b = skb_tail_pointer(skb);
  89         const struct inet_diag_handler *handler;
  90
  91         handler = inet_diag_table[unlh->nlmsg_type];
  92         BUG_ON(handler == NULL);
  93
  94         nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
  95         nlh->nlmsg_flags = nlmsg_flags;
  96
  97         r = NLMSG_DATA(nlh);
  98         BUG_ON(sk->sk_state == TCP_TIME_WAIT);
  99
 100         if (ext & (1 << (INET_DIAG_MEMINFO - 1)))
 101                 minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo));
 102
 103         if (ext & (1 << (INET_DIAG_INFO - 1)))
 104                 info = INET_DIAG_PUT(skb, INET_DIAG_INFO,
 105                                      handler->idiag_info_size);
 106
 107         if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) {
 108                 const size_t len = strlen(icsk->icsk_ca_ops->name);
 109
 110                 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1),
 111                        icsk->icsk_ca_ops->name);
 112         }
 113
 114         r->idiag_family = sk->sk_family;
 115         r->idiag_state = sk->sk_state;
 116         r->idiag_timer = 0;
 117         r->idiag_retrans = 0;
 118
 119         r->id.idiag_if = sk->sk_bound_dev_if;
 120         r->id.idiag_cookie[0] = (u32)(unsigned long)sk;
 121         r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
 122
 123         r->id.idiag_sport = inet->sport;
 124         r->id.idiag_dport = inet->dport;
 125         r->id.idiag_src[0] = inet->rcv_saddr;
 126         r->id.idiag_dst[0] = inet->daddr;
 127
 128 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 129         if (r->idiag_family == AF_INET6) {
 130                 struct ipv6_pinfo *np = inet6_sk(sk);
 131
 132                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
 133                                &np->rcv_saddr);
 134                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
 135                                &np->daddr);
 136         }
 137 #endif
 138
 139 #define EXPIRES_IN_MS(tmo)  DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
 140
 141         if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
 142                 r->idiag_timer = 1;
 143                 r->idiag_retrans = icsk->icsk_retransmits;
 144                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
 145         } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
 146                 r->idiag_timer = 4;
 147                 r->idiag_retrans = icsk->icsk_probes_out;
 148                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
 149         } else if (timer_pending(&sk->sk_timer)) {
 150                 r->idiag_timer = 2;
 151                 r->idiag_retrans = icsk->icsk_probes_out;
 152                 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
 153         } else {
 154                 r->idiag_timer = 0;
 155                 r->idiag_expires = 0;
 156         }
 157 #undef EXPIRES_IN_MS
 158
 159         r->idiag_uid = sock_i_uid(sk);
 160         r->idiag_inode = sock_i_ino(sk);
 161
 162         if (minfo) {
 163                 minfo->idiag_rmem = atomic_read(&sk->sk_rmem_alloc);
 164                 minfo->idiag_wmem = sk->sk_wmem_queued;
 165                 minfo->idiag_fmem = sk->sk_forward_alloc;
 166                 minfo->idiag_tmem = atomic_read(&sk->sk_wmem_alloc);
 167         }
 168
 169         handler->idiag_get_info(sk, r, info);
 170
 171         if (sk->sk_state < TCP_TIME_WAIT &&
 172             icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
 173                 icsk->icsk_ca_ops->get_info(sk, ext, skb);
 174
 175         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
 176         return skb->len;
 177
 178 rtattr_failure:
 179 nlmsg_failure:
 180         nlmsg_trim(skb, b);
 181         return -EMSGSIZE;
 182 }
 183
 184 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
 185                                struct sk_buff *skb, int ext, u32 pid,
 186                                u32 seq, u16 nlmsg_flags,
 187                                const struct nlmsghdr *unlh)
 188 {
 189         long tmo;
 190         struct inet_diag_msg *r;
 191         const unsigned char *previous_tail = skb_tail_pointer(skb);
 192         struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq,
 193                                          unlh->nlmsg_type, sizeof(*r));
 194
 195         r = NLMSG_DATA(nlh);
 196         BUG_ON(tw->tw_state != TCP_TIME_WAIT);
 197
 198         nlh->nlmsg_flags = nlmsg_flags;
 199
 200         tmo = tw->tw_ttd - jiffies;
 201         if (tmo < 0)
 202                 tmo = 0;
 203
 204         r->idiag_family       = tw->tw_family;
 205         r->idiag_state        = tw->tw_state;
 206         r->idiag_timer        = 0;
 207         r->idiag_retrans      = 0;
 208         r->id.idiag_if        = tw->tw_bound_dev_if;
 209         r->id.idiag_cookie[0] = (u32)(unsigned long)tw;
 210         r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1);
 211         r->id.idiag_sport     = tw->tw_sport;
 212         r->id.idiag_dport     = tw->tw_dport;
 213         r->id.idiag_src[0]    = tw->tw_rcv_saddr;
 214         r->id.idiag_dst[0]    = tw->tw_daddr;
 215         r->idiag_state        = tw->tw_substate;
 216         r->idiag_timer        = 3;
 217         r->idiag_expires      = DIV_ROUND_UP(tmo * 1000, HZ);
 218         r->idiag_rqueue       = 0;
 219         r->idiag_wqueue       = 0;
 220         r->idiag_uid          = 0;
 221         r->idiag_inode        = 0;
 222 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 223         if (tw->tw_family == AF_INET6) {
 224                 const struct inet6_timewait_sock *tw6 =
 225                                                 inet6_twsk((struct sock *)tw);
 226
 227                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
 228                                &tw6->tw_v6_rcv_saddr);
 229                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
 230                                &tw6->tw_v6_daddr);
 231         }
 232 #endif
 233         nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail;
 234         return skb->len;
 235 nlmsg_failure:
 236         nlmsg_trim(skb, previous_tail);
 237         return -EMSGSIZE;
 238 }
 239
 240 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
 241                         int ext, u32 pid, u32 seq, u16 nlmsg_flags,
 242                         const struct nlmsghdr *unlh)
 243 {
 244         if (sk->sk_state == TCP_TIME_WAIT)
 245                 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
 246                                            skb, ext, pid, seq, nlmsg_flags,
 247                                            unlh);
 248         return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh);
 249 }
 250
 251 static int inet_diag_get_exact(struct sk_buff *in_skb,
 252                                const struct nlmsghdr *nlh)
 253 {
 254         int err;
 255         struct sock *sk;
 256         struct inet_diag_req *req = NLMSG_DATA(nlh);
 257         struct sk_buff *rep;
 258         struct inet_hashinfo *hashinfo;
 259         const struct inet_diag_handler *handler;
 260
 261         handler = inet_diag_lock_handler(nlh->nlmsg_type);
 262         if (IS_ERR(handler)) {
 263                 err = PTR_ERR(handler);
 264                 goto unlock;
 265         }
 266
 267         hashinfo = handler->idiag_hashinfo;
 268         err = -EINVAL;
 269
 270         if (req->idiag_family == AF_INET) {
 271                 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0],
 272                                  req->id.idiag_dport, req->id.idiag_src[0],
 273                                  req->id.idiag_sport, req->id.idiag_if);
 274         }
 275 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 276         else if (req->idiag_family == AF_INET6) {
 277                 sk = inet6_lookup(&init_net, hashinfo,
 278                                   (struct in6_addr *)req->id.idiag_dst,
 279                                   req->id.idiag_dport,
 280                                   (struct in6_addr *)req->id.idiag_src,
 281                                   req->id.idiag_sport,
 282                                   req->id.idiag_if);
 283         }
 284 #endif
 285         else {
 286                 goto unlock;
 287         }
 288
 289         err = -ENOENT;
 290         if (sk == NULL)
 291                 goto unlock;
 292
 293         err = -ESTALE;
 294         if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE ||
 295              req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) &&
 296             ((u32)(unsigned long)sk != req->id.idiag_cookie[0] ||
 297              (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1]))
 298                 goto out;
 299
 300         err = -ENOMEM;
 301         rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
 302                                      sizeof(struct inet_diag_meminfo) +
 303                                      handler->idiag_info_size + 64)),
 304                         GFP_KERNEL);
 305         if (!rep)
 306                 goto out;
 307
 308         err = sk_diag_fill(sk, rep, req->idiag_ext,
 309                            NETLINK_CB(in_skb).pid,
 310                            nlh->nlmsg_seq, 0, nlh);
 311         if (err < 0) {
 312                 WARN_ON(err == -EMSGSIZE);
 313                 kfree_skb(rep);
 314                 goto out;
 315         }
 316         err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid,
 317                               MSG_DONTWAIT);
 318         if (err > 0)
 319                 err = 0;
 320
 321 out:
 322         if (sk) {
 323                 if (sk->sk_state == TCP_TIME_WAIT)
 324                         inet_twsk_put((struct inet_timewait_sock *)sk);
 325                 else
 326                         sock_put(sk);
 327         }
 328 unlock:
 329         inet_diag_unlock_handler(handler);
 330         return err;
 331 }
 332
 333 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
 334 {
 335         int words = bits >> 5;
 336
 337         bits &= 0x1f;
 338
 339         if (words) {
 340                 if (memcmp(a1, a2, words << 2))
 341                         return 0;
 342         }
 343         if (bits) {
 344                 __be32 w1, w2;
 345                 __be32 mask;
 346
 347                 w1 = a1[words];
 348                 w2 = a2[words];
 349
 350                 mask = htonl((0xffffffff) << (32 - bits));
 351
 352                 if ((w1 ^ w2) & mask)
 353                         return 0;
 354         }
 355
 356         return 1;
 357 }
 358
 359
 360 static int inet_diag_bc_run(const void *bc, int len,
 361                             const struct inet_diag_entry *entry)
 362 {
 363         while (len > 0) {
 364                 int yes = 1;
 365                 const struct inet_diag_bc_op *op = bc;
 366
 367                 switch (op->code) {
 368                 case INET_DIAG_BC_NOP:
 369                         break;
 370                 case INET_DIAG_BC_JMP:
 371                         yes = 0;
 372                         break;
 373                 case INET_DIAG_BC_S_GE:
 374                         yes = entry->sport >= op[1].no;
 375                         break;
 376                 case INET_DIAG_BC_S_LE:
 377                         yes = entry->dport <= op[1].no;
 378                         break;
 379                 case INET_DIAG_BC_D_GE:
 380                         yes = entry->dport >= op[1].no;
 381                         break;
 382                 case INET_DIAG_BC_D_LE:
 383                         yes = entry->dport <= op[1].no;
 384                         break;
 385                 case INET_DIAG_BC_AUTO:
 386                         yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
 387                         break;
 388                 case INET_DIAG_BC_S_COND:
 389                 case INET_DIAG_BC_D_COND: {
 390                         struct inet_diag_hostcond *cond;
 391                         __be32 *addr;
 392
 393                         cond = (struct inet_diag_hostcond *)(op + 1);
 394                         if (cond->port != -1 &&
 395                             cond->port != (op->code == INET_DIAG_BC_S_COND ?
 396                                              entry->sport : entry->dport)) {
 397                                 yes = 0;
 398                                 break;
 399                         }
 400
 401                         if (cond->prefix_len == 0)
 402                                 break;
 403
 404                         if (op->code == INET_DIAG_BC_S_COND)
 405                                 addr = entry->saddr;
 406                         else
 407                                 addr = entry->daddr;
 408
 409                         if (bitstring_match(addr, cond->addr,
 410                                             cond->prefix_len))
 411                                 break;
 412                         if (entry->family == AF_INET6 &&
 413                             cond->family == AF_INET) {
 414                                 if (addr[0] == 0 && addr[1] == 0 &&
 415                                     addr[2] == htonl(0xffff) &&
 416                                     bitstring_match(addr + 3, cond->addr,
 417                                                     cond->prefix_len))
 418                                         break;
 419                         }
 420                         yes = 0;
 421                         break;
 422                 }
 423                 }
 424
 425                 if (yes) {
 426                         len -= op->yes;
 427                         bc += op->yes;
 428                 } else {
 429                         len -= op->no;
 430                         bc += op->no;
 431                 }
 432         }
 433         return (len == 0);
 434 }
 435
 436 static int valid_cc(const void *bc, int len, int cc)
 437 {
 438         while (len >= 0) {
 439                 const struct inet_diag_bc_op *op = bc;
 440
 441                 if (cc > len)
 442                         return 0;
 443                 if (cc == len)
 444                         return 1;
 445                 if (op->yes < 4)
 446                         return 0;
 447                 len -= op->yes;
 448                 bc  += op->yes;
 449         }
 450         return 0;
 451 }
 452
 453 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
 454 {
 455         const unsigned char *bc = bytecode;
 456         int  len = bytecode_len;
 457
 458         while (len > 0) {
 459                 struct inet_diag_bc_op *op = (struct inet_diag_bc_op *)bc;
 460
 461 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
 462                 switch (op->code) {
 463                 case INET_DIAG_BC_AUTO:
 464                 case INET_DIAG_BC_S_COND:
 465                 case INET_DIAG_BC_D_COND:
 466                 case INET_DIAG_BC_S_GE:
 467                 case INET_DIAG_BC_S_LE:
 468                 case INET_DIAG_BC_D_GE:
 469                 case INET_DIAG_BC_D_LE:
 470                         if (op->yes < 4 || op->yes > len + 4)
 471                                 return -EINVAL;
 472                 case INET_DIAG_BC_JMP:
 473                         if (op->no < 4 || op->no > len + 4)
 474                                 return -EINVAL;
 475                         if (op->no < len &&
 476                             !valid_cc(bytecode, bytecode_len, len - op->no))
 477                                 return -EINVAL;
 478                         break;
 479                 case INET_DIAG_BC_NOP:
 480                         if (op->yes < 4 || op->yes > len + 4)
 481                                 return -EINVAL;
 482                         break;
 483                 default:
 484                         return -EINVAL;
 485                 }
 486                 bc  += op->yes;
 487                 len -= op->yes;
 488         }
 489         return len == 0 ? 0 : -EINVAL;
 490 }
 491
 492 static int inet_csk_diag_dump(struct sock *sk,
 493                               struct sk_buff *skb,
 494                               struct netlink_callback *cb)
 495 {
 496         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
 497
 498         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
 499                 struct inet_diag_entry entry;
 500                 struct rtattr *bc = (struct rtattr *)(r + 1);
 501                 struct inet_sock *inet = inet_sk(sk);
 502
 503                 entry.family = sk->sk_family;
 504 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 505                 if (entry.family == AF_INET6) {
 506                         struct ipv6_pinfo *np = inet6_sk(sk);
 507
 508                         entry.saddr = np->rcv_saddr.s6_addr32;
 509                         entry.daddr = np->daddr.s6_addr32;
 510                 } else
 511 #endif
 512                 {
 513                         entry.saddr = &inet->rcv_saddr;
 514                         entry.daddr = &inet->daddr;
 515                 }
 516                 entry.sport = inet->num;
 517                 entry.dport = ntohs(inet->dport);
 518                 entry.userlocks = sk->sk_userlocks;
 519
 520                 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
 521                         return 0;
 522         }
 523
 524         return inet_csk_diag_fill(sk, skb, r->idiag_ext,
 525                                   NETLINK_CB(cb->skb).pid,
 526                                   cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
 527 }
 528
 529 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
 530                                struct sk_buff *skb,
 531                                struct netlink_callback *cb)
 532 {
 533         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
 534
 535         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
 536                 struct inet_diag_entry entry;
 537                 struct rtattr *bc = (struct rtattr *)(r + 1);
 538
 539                 entry.family = tw->tw_family;
 540 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 541                 if (tw->tw_family == AF_INET6) {
 542                         struct inet6_timewait_sock *tw6 =
 543                                                 inet6_twsk((struct sock *)tw);
 544                         entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
 545                         entry.daddr = tw6->tw_v6_daddr.s6_addr32;
 546                 } else
 547 #endif
 548                 {
 549                         entry.saddr = &tw->tw_rcv_saddr;
 550                         entry.daddr = &tw->tw_daddr;
 551                 }
 552                 entry.sport = tw->tw_num;
 553                 entry.dport = ntohs(tw->tw_dport);
 554                 entry.userlocks = 0;
 555
 556                 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
 557                         return 0;
 558         }
 559
 560         return inet_twsk_diag_fill(tw, skb, r->idiag_ext,
 561                                    NETLINK_CB(cb->skb).pid,
 562                                    cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
 563 }
 564
 565 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
 566                               struct request_sock *req, u32 pid, u32 seq,
 567                               const struct nlmsghdr *unlh)
 568 {
 569         const struct inet_request_sock *ireq = inet_rsk(req);
 570         struct inet_sock *inet = inet_sk(sk);
 571         unsigned char *b = skb_tail_pointer(skb);
 572         struct inet_diag_msg *r;
 573         struct nlmsghdr *nlh;
 574         long tmo;
 575
 576         nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
 577         nlh->nlmsg_flags = NLM_F_MULTI;
 578         r = NLMSG_DATA(nlh);
 579
 580         r->idiag_family = sk->sk_family;
 581         r->idiag_state = TCP_SYN_RECV;
 582         r->idiag_timer = 1;
 583         r->idiag_retrans = req->retrans;
 584
 585         r->id.idiag_if = sk->sk_bound_dev_if;
 586         r->id.idiag_cookie[0] = (u32)(unsigned long)req;
 587         r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
 588
 589         tmo = req->expires - jiffies;
 590         if (tmo < 0)
 591                 tmo = 0;
 592
 593         r->id.idiag_sport = inet->sport;
 594         r->id.idiag_dport = ireq->rmt_port;
 595         r->id.idiag_src[0] = ireq->loc_addr;
 596         r->id.idiag_dst[0] = ireq->rmt_addr;
 597         r->idiag_expires = jiffies_to_msecs(tmo);
 598         r->idiag_rqueue = 0;
 599         r->idiag_wqueue = 0;
 600         r->idiag_uid = sock_i_uid(sk);
 601         r->idiag_inode = 0;
 602 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 603         if (r->idiag_family == AF_INET6) {
 604                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
 605                                &inet6_rsk(req)->loc_addr);
 606                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
 607                                &inet6_rsk(req)->rmt_addr);
 608         }
 609 #endif
 610         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
 611
 612         return skb->len;
 613
 614 nlmsg_failure:
 615         nlmsg_trim(skb, b);
 616         return -1;
 617 }
 618
 619 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
 620                                struct netlink_callback *cb)
 621 {
 622         struct inet_diag_entry entry;
 623         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
 624         struct inet_connection_sock *icsk = inet_csk(sk);
 625         struct listen_sock *lopt;
 626         struct rtattr *bc = NULL;
 627         struct inet_sock *inet = inet_sk(sk);
 628         int j, s_j;
 629         int reqnum, s_reqnum;
 630         int err = 0;
 631
 632         s_j = cb->args[3];
 633         s_reqnum = cb->args[4];
 634
 635         if (s_j > 0)
 636                 s_j--;
 637
 638         entry.family = sk->sk_family;
 639
 640         read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 641
 642         lopt = icsk->icsk_accept_queue.listen_opt;
 643         if (!lopt || !lopt->qlen)
 644                 goto out;
 645
 646         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
 647                 bc = (struct rtattr *)(r + 1);
 648                 entry.sport = inet->num;
 649                 entry.userlocks = sk->sk_userlocks;
 650         }
 651
 652         for (j = s_j; j < lopt->nr_table_entries; j++) {
 653                 struct request_sock *req, *head = lopt->syn_table[j];
 654
 655                 reqnum = 0;
 656                 for (req = head; req; reqnum++, req = req->dl_next) {
 657                         struct inet_request_sock *ireq = inet_rsk(req);
 658
 659                         if (reqnum < s_reqnum)
 660                                 continue;
 661                         if (r->id.idiag_dport != ireq->rmt_port &&
 662                             r->id.idiag_dport)
 663                                 continue;
 664
 665                         if (bc) {
 666                                 entry.saddr =
 667 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 668                                         (entry.family == AF_INET6) ?
 669                                         inet6_rsk(req)->loc_addr.s6_addr32 :
 670 #endif
 671                                         &ireq->loc_addr;
 672                                 entry.daddr =
 673 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 674                                         (entry.family == AF_INET6) ?
 675                                         inet6_rsk(req)->rmt_addr.s6_addr32 :
 676 #endif
 677                                         &ireq->rmt_addr;
 678                                 entry.dport = ntohs(ireq->rmt_port);
 679
 680                                 if (!inet_diag_bc_run(RTA_DATA(bc),
 681                                                     RTA_PAYLOAD(bc), &entry))
 682                                         continue;
 683                         }
 684
 685                         err = inet_diag_fill_req(skb, sk, req,
 686                                                NETLINK_CB(cb->skb).pid,
 687                                                cb->nlh->nlmsg_seq, cb->nlh);
 688                         if (err < 0) {
 689                                 cb->args[3] = j + 1;
 690                                 cb->args[4] = reqnum;
 691                                 goto out;
 692                         }
 693                 }
 694
 695                 s_reqnum = 0;
 696         }
 697
 698 out:
 699         read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 700
 701         return err;
 702 }
 703
 704 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
 705 {
 706         int i, num;
 707         int s_i, s_num;
 708         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
 709         const struct inet_diag_handler *handler;
 710         struct inet_hashinfo *hashinfo;
 711
 712         handler = inet_diag_lock_handler(cb->nlh->nlmsg_type);
 713         if (IS_ERR(handler))
 714                 goto unlock;
 715
 716         hashinfo = handler->idiag_hashinfo;
 717
 718         s_i = cb->args[1];
 719         s_num = num = cb->args[2];
 720
 721         if (cb->args[0] == 0) {
 722                 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
 723                         goto skip_listen_ht;
 724
 725                 inet_listen_lock(hashinfo);
 726                 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
 727                         struct sock *sk;
 728                         struct hlist_node *node;
 729
 730                         num = 0;
 731                         sk_for_each(sk, node, &hashinfo->listening_hash[i]) {
 732                                 struct inet_sock *inet = inet_sk(sk);
 733
 734                                 if (num < s_num) {
 735                                         num++;
 736                                         continue;
 737                                 }
 738
 739                                 if (r->id.idiag_sport != inet->sport &&
 740                                     r->id.idiag_sport)
 741                                         goto next_listen;
 742
 743                                 if (!(r->idiag_states & TCPF_LISTEN) ||
 744                                     r->id.idiag_dport ||
 745                                     cb->args[3] > 0)
 746                                         goto syn_recv;
 747
 748                                 if (inet_csk_diag_dump(sk, skb, cb) < 0) {
 749                                         inet_listen_unlock(hashinfo);
 750                                         goto done;
 751                                 }
 752
 753 syn_recv:
 754                                 if (!(r->idiag_states & TCPF_SYN_RECV))
 755                                         goto next_listen;
 756
 757                                 if (inet_diag_dump_reqs(skb, sk, cb) < 0) {
 758                                         inet_listen_unlock(hashinfo);
 759                                         goto done;
 760                                 }
 761
 762 next_listen:
 763                                 cb->args[3] = 0;
 764                                 cb->args[4] = 0;
 765                                 ++num;
 766                         }
 767
 768                         s_num = 0;
 769                         cb->args[3] = 0;
 770                         cb->args[4] = 0;
 771                 }
 772                 inet_listen_unlock(hashinfo);
 773 skip_listen_ht:
 774                 cb->args[0] = 1;
 775                 s_i = num = s_num = 0;
 776         }
 777
 778         if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
 779                 goto unlock;
 780
 781         for (i = s_i; i < hashinfo->ehash_size; i++) {
 782                 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
 783                 rwlock_t *lock = inet_ehash_lockp(hashinfo, i);
 784                 struct sock *sk;
 785                 struct hlist_node *node;
 786
 787                 if (i > s_i)
 788                         s_num = 0;
 789
 790                 read_lock_bh(lock);
 791                 num = 0;
 792                 sk_for_each(sk, node, &head->chain) {
 793                         struct inet_sock *inet = inet_sk(sk);
 794
 795                         if (num < s_num)
 796                                 goto next_normal;
 797                         if (!(r->idiag_states & (1 << sk->sk_state)))
 798                                 goto next_normal;
 799                         if (r->id.idiag_sport != inet->sport &&
 800                             r->id.idiag_sport)
 801                                 goto next_normal;
 802                         if (r->id.idiag_dport != inet->dport &&
 803                             r->id.idiag_dport)
 804                                 goto next_normal;
 805                         if (inet_csk_diag_dump(sk, skb, cb) < 0) {
 806                                 read_unlock_bh(lock);
 807                                 goto done;
 808                         }
 809 next_normal:
 810                         ++num;
 811                 }
 812
 813                 if (r->idiag_states & TCPF_TIME_WAIT) {
 814                         struct inet_timewait_sock *tw;
 815
 816                         inet_twsk_for_each(tw, node,
 817                                     &head->twchain) {
 818
 819                                 if (num < s_num)
 820                                         goto next_dying;
 821                                 if (r->id.idiag_sport != tw->tw_sport &&
 822                                     r->id.idiag_sport)
 823                                         goto next_dying;
 824                                 if (r->id.idiag_dport != tw->tw_dport &&
 825                                     r->id.idiag_dport)
 826                                         goto next_dying;
 827                                 if (inet_twsk_diag_dump(tw, skb, cb) < 0) {
 828                                         read_unlock_bh(lock);
 829                                         goto done;
 830                                 }
 831 next_dying:
 832                                 ++num;
 833                         }
 834                 }
 835                 read_unlock_bh(lock);
 836         }
 837
 838 done:
 839         cb->args[1] = i;
 840         cb->args[2] = num;
 841 unlock:
 842         inet_diag_unlock_handler(handler);
 843         return skb->len;
 844 }
 845
 846 static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
 847 {
 848         int hdrlen = sizeof(struct inet_diag_req);
 849
 850         if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
 851             nlmsg_len(nlh) < hdrlen)
 852                 return -EINVAL;
 853
 854         if (nlh->nlmsg_flags & NLM_F_DUMP) {
 855                 if (nlmsg_attrlen(nlh, hdrlen)) {
 856                         struct nlattr *attr;
 857
 858                         attr = nlmsg_find_attr(nlh, hdrlen,
 859                                                INET_DIAG_REQ_BYTECODE);
 860                         if (attr == NULL ||
 861                             nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
 862                             inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
 863                                 return -EINVAL;
 864                 }
 865
 866                 return netlink_dump_start(idiagnl, skb, nlh,
 867                                           inet_diag_dump, NULL);
 868         }
 869
 870         return inet_diag_get_exact(skb, nlh);
 871 }
 872
 873 static DEFINE_MUTEX(inet_diag_mutex);
 874
 875 static void inet_diag_rcv(struct sk_buff *skb)
 876 {
 877         mutex_lock(&inet_diag_mutex);
 878         netlink_rcv_skb(skb, &inet_diag_rcv_msg);
 879         mutex_unlock(&inet_diag_mutex);
 880 }
 881
 882 int inet_diag_register(const struct inet_diag_handler *h)
 883 {
 884         const __u16 type = h->idiag_type;
 885         int err = -EINVAL;
 886
 887         if (type >= INET_DIAG_GETSOCK_MAX)
 888                 goto out;
 889
 890         mutex_lock(&inet_diag_table_mutex);
 891         err = -EEXIST;
 892         if (inet_diag_table[type] == NULL) {
 893                 inet_diag_table[type] = h;
 894                 err = 0;
 895         }
 896         mutex_unlock(&inet_diag_table_mutex);
 897 out:
 898         return err;
 899 }
 900 EXPORT_SYMBOL_GPL(inet_diag_register);
 901
 902 void inet_diag_unregister(const struct inet_diag_handler *h)
 903 {
 904         const __u16 type = h->idiag_type;
 905
 906         if (type >= INET_DIAG_GETSOCK_MAX)
 907                 return;
 908
 909         mutex_lock(&inet_diag_table_mutex);
 910         inet_diag_table[type] = NULL;
 911         mutex_unlock(&inet_diag_table_mutex);
 912 }
 913 EXPORT_SYMBOL_GPL(inet_diag_unregister);
 914
 915 static int __init inet_diag_init(void)
 916 {
 917         const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX *
 918                                           sizeof(struct inet_diag_handler *));
 919         int err = -ENOMEM;
 920
 921         inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
 922         if (!inet_diag_table)
 923                 goto out;
 924
 925         idiagnl = netlink_kernel_create(&init_net, NETLINK_INET_DIAG, 0,
 926                                         inet_diag_rcv, NULL, THIS_MODULE);
 927         if (idiagnl == NULL)
 928                 goto out_free_table;
 929         err = 0;
 930 out:
 931         return err;
 932 out_free_table:
 933         kfree(inet_diag_table);
 934         goto out;
 935 }
 936
 937 static void __exit inet_diag_exit(void)
 938 {
 939         netlink_kernel_release(idiagnl);
 940         kfree(inet_diag_table);
 941 }
 942
 943 module_init(inet_diag_init);
 944 module_exit(inet_diag_exit);
 945 MODULE_LICENSE("GPL");
 946 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_INET_DIAG);