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/slab.h>
  18 #include <linux/cache.h>
  19 #include <linux/init.h>
  20 #include <linux/time.h>
  21
  22 #include <net/icmp.h>
  23 #include <net/tcp.h>
  24 #include <net/ipv6.h>
  25 #include <net/inet_common.h>
  26 #include <net/inet_connection_sock.h>
  27 #include <net/inet_hashtables.h>
  28 #include <net/inet_timewait_sock.h>
  29 #include <net/inet6_hashtables.h>
  30 #include <net/netlink.h>
  31
  32 #include <linux/inet.h>
  33 #include <linux/stddef.h>
  34
  35 #include <linux/inet_diag.h>
  36 #include <linux/sock_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 #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 proto)
  55 {
  56         if (!inet_diag_table[proto])
  57                 request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
  58                                NETLINK_SOCK_DIAG, proto);
  59
  60         mutex_lock(&inet_diag_table_mutex);
  61         if (!inet_diag_table[proto])
  62                 return ERR_PTR(-ENOENT);
  63
  64         return inet_diag_table[proto];
  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, struct inet_diag_req *req,
  75                               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         int ext = req->idiag_ext;
  87
  88         handler = inet_diag_table[req->sdiag_protocol];
  89         BUG_ON(handler == NULL);
  90
  91         nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
  92         nlh->nlmsg_flags = nlmsg_flags;
  93
  94         r = NLMSG_DATA(nlh);
  95         BUG_ON(sk->sk_state == TCP_TIME_WAIT);
  96
  97         if (ext & (1 << (INET_DIAG_MEMINFO - 1)))
  98                 minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo));
  99
 100         if (ext & (1 << (INET_DIAG_INFO - 1)))
 101                 info = INET_DIAG_PUT(skb, INET_DIAG_INFO,
 102                                      handler->idiag_info_size);
 103
 104         if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) {
 105                 const size_t len = strlen(icsk->icsk_ca_ops->name);
 106
 107                 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1),
 108                        icsk->icsk_ca_ops->name);
 109         }
 110
 111         r->idiag_family = sk->sk_family;
 112         r->idiag_state = sk->sk_state;
 113         r->idiag_timer = 0;
 114         r->idiag_retrans = 0;
 115
 116         r->id.idiag_if = sk->sk_bound_dev_if;
 117         r->id.idiag_cookie[0] = (u32)(unsigned long)sk;
 118         r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
 119
 120         r->id.idiag_sport = inet->inet_sport;
 121         r->id.idiag_dport = inet->inet_dport;
 122         r->id.idiag_src[0] = inet->inet_rcv_saddr;
 123         r->id.idiag_dst[0] = inet->inet_daddr;
 124
 125         /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
 126          * hence this needs to be included regardless of socket family.
 127          */
 128         if (ext & (1 << (INET_DIAG_TOS - 1)))
 129                 RTA_PUT_U8(skb, INET_DIAG_TOS, inet->tos);
 130
 131 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 132         if (r->idiag_family == AF_INET6) {
 133                 const struct ipv6_pinfo *np = inet6_sk(sk);
 134
 135                 *(struct in6_addr *)r->id.idiag_src = np->rcv_saddr;
 136                 *(struct in6_addr *)r->id.idiag_dst = np->daddr;
 137                 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
 138                         RTA_PUT_U8(skb, INET_DIAG_TCLASS, np->tclass);
 139         }
 140 #endif
 141
 142 #define EXPIRES_IN_MS(tmo)  DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
 143
 144         if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
 145                 r->idiag_timer = 1;
 146                 r->idiag_retrans = icsk->icsk_retransmits;
 147                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
 148         } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
 149                 r->idiag_timer = 4;
 150                 r->idiag_retrans = icsk->icsk_probes_out;
 151                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
 152         } else if (timer_pending(&sk->sk_timer)) {
 153                 r->idiag_timer = 2;
 154                 r->idiag_retrans = icsk->icsk_probes_out;
 155                 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
 156         } else {
 157                 r->idiag_timer = 0;
 158                 r->idiag_expires = 0;
 159         }
 160 #undef EXPIRES_IN_MS
 161
 162         r->idiag_uid = sock_i_uid(sk);
 163         r->idiag_inode = sock_i_ino(sk);
 164
 165         if (minfo) {
 166                 minfo->idiag_rmem = sk_rmem_alloc_get(sk);
 167                 minfo->idiag_wmem = sk->sk_wmem_queued;
 168                 minfo->idiag_fmem = sk->sk_forward_alloc;
 169                 minfo->idiag_tmem = sk_wmem_alloc_get(sk);
 170         }
 171
 172         handler->idiag_get_info(sk, r, info);
 173
 174         if (sk->sk_state < TCP_TIME_WAIT &&
 175             icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
 176                 icsk->icsk_ca_ops->get_info(sk, ext, skb);
 177
 178         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
 179         return skb->len;
 180
 181 rtattr_failure:
 182 nlmsg_failure:
 183         nlmsg_trim(skb, b);
 184         return -EMSGSIZE;
 185 }
 186
 187 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
 188                                struct sk_buff *skb, struct inet_diag_req *req,
 189                                u32 pid, u32 seq, u16 nlmsg_flags,
 190                                const struct nlmsghdr *unlh)
 191 {
 192         long tmo;
 193         struct inet_diag_msg *r;
 194         const unsigned char *previous_tail = skb_tail_pointer(skb);
 195         struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq,
 196                                          unlh->nlmsg_type, sizeof(*r));
 197
 198         r = NLMSG_DATA(nlh);
 199         BUG_ON(tw->tw_state != TCP_TIME_WAIT);
 200
 201         nlh->nlmsg_flags = nlmsg_flags;
 202
 203         tmo = tw->tw_ttd - jiffies;
 204         if (tmo < 0)
 205                 tmo = 0;
 206
 207         r->idiag_family       = tw->tw_family;
 208         r->idiag_retrans      = 0;
 209         r->id.idiag_if        = tw->tw_bound_dev_if;
 210         r->id.idiag_cookie[0] = (u32)(unsigned long)tw;
 211         r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1);
 212         r->id.idiag_sport     = tw->tw_sport;
 213         r->id.idiag_dport     = tw->tw_dport;
 214         r->id.idiag_src[0]    = tw->tw_rcv_saddr;
 215         r->id.idiag_dst[0]    = tw->tw_daddr;
 216         r->idiag_state        = tw->tw_substate;
 217         r->idiag_timer        = 3;
 218         r->idiag_expires      = DIV_ROUND_UP(tmo * 1000, HZ);
 219         r->idiag_rqueue       = 0;
 220         r->idiag_wqueue       = 0;
 221         r->idiag_uid          = 0;
 222         r->idiag_inode        = 0;
 223 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 224         if (tw->tw_family == AF_INET6) {
 225                 const struct inet6_timewait_sock *tw6 =
 226                                                 inet6_twsk((struct sock *)tw);
 227
 228                 *(struct in6_addr *)r->id.idiag_src = tw6->tw_v6_rcv_saddr;
 229                 *(struct in6_addr *)r->id.idiag_dst = tw6->tw_v6_daddr;
 230         }
 231 #endif
 232         nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail;
 233         return skb->len;
 234 nlmsg_failure:
 235         nlmsg_trim(skb, previous_tail);
 236         return -EMSGSIZE;
 237 }
 238
 239 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
 240                         struct inet_diag_req *r, u32 pid, u32 seq, u16 nlmsg_flags,
 241                         const struct nlmsghdr *unlh)
 242 {
 243         if (sk->sk_state == TCP_TIME_WAIT)
 244                 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
 245                                            skb, r, pid, seq, nlmsg_flags,
 246                                            unlh);
 247         return inet_csk_diag_fill(sk, skb, r, pid, seq, nlmsg_flags, unlh);
 248 }
 249
 250 static int inet_diag_get_exact(struct sk_buff *in_skb,
 251                                const struct nlmsghdr *nlh,
 252                                struct inet_diag_req *req)
 253 {
 254         int err;
 255         struct sock *sk;
 256         struct sk_buff *rep;
 257         struct inet_hashinfo *hashinfo;
 258         const struct inet_diag_handler *handler;
 259
 260         handler = inet_diag_lock_handler(req->sdiag_protocol);
 261         if (IS_ERR(handler)) {
 262                 err = PTR_ERR(handler);
 263                 goto unlock;
 264         }
 265
 266         hashinfo = handler->idiag_hashinfo;
 267         err = -EINVAL;
 268
 269         if (req->sdiag_family == AF_INET) {
 270                 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0],
 271                                  req->id.idiag_dport, req->id.idiag_src[0],
 272                                  req->id.idiag_sport, req->id.idiag_if);
 273         }
 274 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 275         else if (req->sdiag_family == AF_INET6) {
 276                 sk = inet6_lookup(&init_net, hashinfo,
 277                                   (struct in6_addr *)req->id.idiag_dst,
 278                                   req->id.idiag_dport,
 279                                   (struct in6_addr *)req->id.idiag_src,
 280                                   req->id.idiag_sport,
 281                                   req->id.idiag_if);
 282         }
 283 #endif
 284         else {
 285                 goto unlock;
 286         }
 287
 288         err = -ENOENT;
 289         if (sk == NULL)
 290                 goto unlock;
 291
 292         err = -ESTALE;
 293         if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE ||
 294              req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) &&
 295             ((u32)(unsigned long)sk != req->id.idiag_cookie[0] ||
 296              (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1]))
 297                 goto out;
 298
 299         err = -ENOMEM;
 300         rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
 301                                      sizeof(struct inet_diag_meminfo) +
 302                                      handler->idiag_info_size + 64)),
 303                         GFP_KERNEL);
 304         if (!rep)
 305                 goto out;
 306
 307         err = sk_diag_fill(sk, rep, req,
 308                            NETLINK_CB(in_skb).pid,
 309                            nlh->nlmsg_seq, 0, nlh);
 310         if (err < 0) {
 311                 WARN_ON(err == -EMSGSIZE);
 312                 kfree_skb(rep);
 313                 goto out;
 314         }
 315         err = netlink_unicast(sock_diag_nlsk, rep, NETLINK_CB(in_skb).pid,
 316                               MSG_DONTWAIT);
 317         if (err > 0)
 318                 err = 0;
 319
 320 out:
 321         if (sk) {
 322                 if (sk->sk_state == TCP_TIME_WAIT)
 323                         inet_twsk_put((struct inet_timewait_sock *)sk);
 324                 else
 325                         sock_put(sk);
 326         }
 327 unlock:
 328         inet_diag_unlock_handler(handler);
 329         return err;
 330 }
 331
 332 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
 333 {
 334         int words = bits >> 5;
 335
 336         bits &= 0x1f;
 337
 338         if (words) {
 339                 if (memcmp(a1, a2, words << 2))
 340                         return 0;
 341         }
 342         if (bits) {
 343                 __be32 w1, w2;
 344                 __be32 mask;
 345
 346                 w1 = a1[words];
 347                 w2 = a2[words];
 348
 349                 mask = htonl((0xffffffff) << (32 - bits));
 350
 351                 if ((w1 ^ w2) & mask)
 352                         return 0;
 353         }
 354
 355         return 1;
 356 }
 357
 358
 359 static int inet_diag_bc_run(const void *bc, int len,
 360                             const struct inet_diag_entry *entry)
 361 {
 362         while (len > 0) {
 363                 int yes = 1;
 364                 const struct inet_diag_bc_op *op = bc;
 365
 366                 switch (op->code) {
 367                 case INET_DIAG_BC_NOP:
 368                         break;
 369                 case INET_DIAG_BC_JMP:
 370                         yes = 0;
 371                         break;
 372                 case INET_DIAG_BC_S_GE:
 373                         yes = entry->sport >= op[1].no;
 374                         break;
 375                 case INET_DIAG_BC_S_LE:
 376                         yes = entry->sport <= op[1].no;
 377                         break;
 378                 case INET_DIAG_BC_D_GE:
 379                         yes = entry->dport >= op[1].no;
 380                         break;
 381                 case INET_DIAG_BC_D_LE:
 382                         yes = entry->dport <= op[1].no;
 383                         break;
 384                 case INET_DIAG_BC_AUTO:
 385                         yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
 386                         break;
 387                 case INET_DIAG_BC_S_COND:
 388                 case INET_DIAG_BC_D_COND: {
 389                         struct inet_diag_hostcond *cond;
 390                         __be32 *addr;
 391
 392                         cond = (struct inet_diag_hostcond *)(op + 1);
 393                         if (cond->port != -1 &&
 394                             cond->port != (op->code == INET_DIAG_BC_S_COND ?
 395                                              entry->sport : entry->dport)) {
 396                                 yes = 0;
 397                                 break;
 398                         }
 399
 400                         if (cond->prefix_len == 0)
 401                                 break;
 402
 403                         if (op->code == INET_DIAG_BC_S_COND)
 404                                 addr = entry->saddr;
 405                         else
 406                                 addr = entry->daddr;
 407
 408                         if (bitstring_match(addr, cond->addr,
 409                                             cond->prefix_len))
 410                                 break;
 411                         if (entry->family == AF_INET6 &&
 412                             cond->family == AF_INET) {
 413                                 if (addr[0] == 0 && addr[1] == 0 &&
 414                                     addr[2] == htonl(0xffff) &&
 415                                     bitstring_match(addr + 3, cond->addr,
 416                                                     cond->prefix_len))
 417                                         break;
 418                         }
 419                         yes = 0;
 420                         break;
 421                 }
 422                 }
 423
 424                 if (yes) {
 425                         len -= op->yes;
 426                         bc += op->yes;
 427                 } else {
 428                         len -= op->no;
 429                         bc += op->no;
 430                 }
 431         }
 432         return len == 0;
 433 }
 434
 435 static int valid_cc(const void *bc, int len, int cc)
 436 {
 437         while (len >= 0) {
 438                 const struct inet_diag_bc_op *op = bc;
 439
 440                 if (cc > len)
 441                         return 0;
 442                 if (cc == len)
 443                         return 1;
 444                 if (op->yes < 4 || op->yes & 3)
 445                         return 0;
 446                 len -= op->yes;
 447                 bc  += op->yes;
 448         }
 449         return 0;
 450 }
 451
 452 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
 453 {
 454         const void *bc = bytecode;
 455         int  len = bytecode_len;
 456
 457         while (len > 0) {
 458                 const struct inet_diag_bc_op *op = bc;
 459
 460 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
 461                 switch (op->code) {
 462                 case INET_DIAG_BC_AUTO:
 463                 case INET_DIAG_BC_S_COND:
 464                 case INET_DIAG_BC_D_COND:
 465                 case INET_DIAG_BC_S_GE:
 466                 case INET_DIAG_BC_S_LE:
 467                 case INET_DIAG_BC_D_GE:
 468                 case INET_DIAG_BC_D_LE:
 469                 case INET_DIAG_BC_JMP:
 470                         if (op->no < 4 || op->no > len + 4 || op->no & 3)
 471                                 return -EINVAL;
 472                         if (op->no < len &&
 473                             !valid_cc(bytecode, bytecode_len, len - op->no))
 474                                 return -EINVAL;
 475                         break;
 476                 case INET_DIAG_BC_NOP:
 477                         break;
 478                 default:
 479                         return -EINVAL;
 480                 }
 481                 if (op->yes < 4 || op->yes > len + 4 || op->yes & 3)
 482                         return -EINVAL;
 483                 bc  += op->yes;
 484                 len -= op->yes;
 485         }
 486         return len == 0 ? 0 : -EINVAL;
 487 }
 488
 489 static int inet_csk_diag_dump(struct sock *sk,
 490                               struct sk_buff *skb,
 491                               struct netlink_callback *cb,
 492                               struct inet_diag_req *r,
 493                               const struct nlattr *bc)
 494 {
 495         if (bc != NULL) {
 496                 struct inet_diag_entry entry;
 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->inet_rcv_saddr;
 510                         entry.daddr = &inet->inet_daddr;
 511                 }
 512                 entry.sport = inet->inet_num;
 513                 entry.dport = ntohs(inet->inet_dport);
 514                 entry.userlocks = sk->sk_userlocks;
 515
 516                 if (!inet_diag_bc_run(nla_data(bc), nla_len(bc), &entry))
 517                         return 0;
 518         }
 519
 520         return inet_csk_diag_fill(sk, skb, r,
 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                                struct inet_diag_req *r,
 529                                const struct nlattr *bc)
 530 {
 531         if (bc != NULL) {
 532                 struct inet_diag_entry entry;
 533
 534                 entry.family = tw->tw_family;
 535 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 536                 if (tw->tw_family == AF_INET6) {
 537                         struct inet6_timewait_sock *tw6 =
 538                                                 inet6_twsk((struct sock *)tw);
 539                         entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
 540                         entry.daddr = tw6->tw_v6_daddr.s6_addr32;
 541                 } else
 542 #endif
 543                 {
 544                         entry.saddr = &tw->tw_rcv_saddr;
 545                         entry.daddr = &tw->tw_daddr;
 546                 }
 547                 entry.sport = tw->tw_num;
 548                 entry.dport = ntohs(tw->tw_dport);
 549                 entry.userlocks = 0;
 550
 551                 if (!inet_diag_bc_run(nla_data(bc), nla_len(bc), &entry))
 552                         return 0;
 553         }
 554
 555         return inet_twsk_diag_fill(tw, skb, r,
 556                                    NETLINK_CB(cb->skb).pid,
 557                                    cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
 558 }
 559
 560 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
 561                               struct request_sock *req, u32 pid, u32 seq,
 562                               const struct nlmsghdr *unlh)
 563 {
 564         const struct inet_request_sock *ireq = inet_rsk(req);
 565         struct inet_sock *inet = inet_sk(sk);
 566         unsigned char *b = skb_tail_pointer(skb);
 567         struct inet_diag_msg *r;
 568         struct nlmsghdr *nlh;
 569         long tmo;
 570
 571         nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
 572         nlh->nlmsg_flags = NLM_F_MULTI;
 573         r = NLMSG_DATA(nlh);
 574
 575         r->idiag_family = sk->sk_family;
 576         r->idiag_state = TCP_SYN_RECV;
 577         r->idiag_timer = 1;
 578         r->idiag_retrans = req->retrans;
 579
 580         r->id.idiag_if = sk->sk_bound_dev_if;
 581         r->id.idiag_cookie[0] = (u32)(unsigned long)req;
 582         r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
 583
 584         tmo = req->expires - jiffies;
 585         if (tmo < 0)
 586                 tmo = 0;
 587
 588         r->id.idiag_sport = inet->inet_sport;
 589         r->id.idiag_dport = ireq->rmt_port;
 590         r->id.idiag_src[0] = ireq->loc_addr;
 591         r->id.idiag_dst[0] = ireq->rmt_addr;
 592         r->idiag_expires = jiffies_to_msecs(tmo);
 593         r->idiag_rqueue = 0;
 594         r->idiag_wqueue = 0;
 595         r->idiag_uid = sock_i_uid(sk);
 596         r->idiag_inode = 0;
 597 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 598         if (r->idiag_family == AF_INET6) {
 599                 *(struct in6_addr *)r->id.idiag_src = inet6_rsk(req)->loc_addr;
 600                 *(struct in6_addr *)r->id.idiag_dst = inet6_rsk(req)->rmt_addr;
 601         }
 602 #endif
 603         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
 604
 605         return skb->len;
 606
 607 nlmsg_failure:
 608         nlmsg_trim(skb, b);
 609         return -1;
 610 }
 611
 612 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
 613                                struct netlink_callback *cb,
 614                                struct inet_diag_req *r,
 615                                const struct nlattr *bc)
 616 {
 617         struct inet_diag_entry entry;
 618         struct inet_connection_sock *icsk = inet_csk(sk);
 619         struct listen_sock *lopt;
 620         struct inet_sock *inet = inet_sk(sk);
 621         int j, s_j;
 622         int reqnum, s_reqnum;
 623         int err = 0;
 624
 625         s_j = cb->args[3];
 626         s_reqnum = cb->args[4];
 627
 628         if (s_j > 0)
 629                 s_j--;
 630
 631         entry.family = sk->sk_family;
 632
 633         read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 634
 635         lopt = icsk->icsk_accept_queue.listen_opt;
 636         if (!lopt || !lopt->qlen)
 637                 goto out;
 638
 639         if (bc != NULL) {
 640                 entry.sport = inet->inet_num;
 641                 entry.userlocks = sk->sk_userlocks;
 642         }
 643
 644         for (j = s_j; j < lopt->nr_table_entries; j++) {
 645                 struct request_sock *req, *head = lopt->syn_table[j];
 646
 647                 reqnum = 0;
 648                 for (req = head; req; reqnum++, req = req->dl_next) {
 649                         struct inet_request_sock *ireq = inet_rsk(req);
 650
 651                         if (reqnum < s_reqnum)
 652                                 continue;
 653                         if (r->id.idiag_dport != ireq->rmt_port &&
 654                             r->id.idiag_dport)
 655                                 continue;
 656
 657                         if (bc) {
 658                                 entry.saddr =
 659 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 660                                         (entry.family == AF_INET6) ?
 661                                         inet6_rsk(req)->loc_addr.s6_addr32 :
 662 #endif
 663                                         &ireq->loc_addr;
 664                                 entry.daddr =
 665 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 666                                         (entry.family == AF_INET6) ?
 667                                         inet6_rsk(req)->rmt_addr.s6_addr32 :
 668 #endif
 669                                         &ireq->rmt_addr;
 670                                 entry.dport = ntohs(ireq->rmt_port);
 671
 672                                 if (!inet_diag_bc_run(nla_data(bc),
 673                                                       nla_len(bc), &entry))
 674                                         continue;
 675                         }
 676
 677                         err = inet_diag_fill_req(skb, sk, req,
 678                                                NETLINK_CB(cb->skb).pid,
 679                                                cb->nlh->nlmsg_seq, cb->nlh);
 680                         if (err < 0) {
 681                                 cb->args[3] = j + 1;
 682                                 cb->args[4] = reqnum;
 683                                 goto out;
 684                         }
 685                 }
 686
 687                 s_reqnum = 0;
 688         }
 689
 690 out:
 691         read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 692
 693         return err;
 694 }
 695
 696 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
 697                 struct inet_diag_req *r, struct nlattr *bc)
 698 {
 699         int i, num;
 700         int s_i, s_num;
 701         const struct inet_diag_handler *handler;
 702         struct inet_hashinfo *hashinfo;
 703
 704         handler = inet_diag_lock_handler(r->sdiag_protocol);
 705         if (IS_ERR(handler))
 706                 goto unlock;
 707
 708         hashinfo = handler->idiag_hashinfo;
 709
 710         s_i = cb->args[1];
 711         s_num = num = cb->args[2];
 712
 713         if (cb->args[0] == 0) {
 714                 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
 715                         goto skip_listen_ht;
 716
 717                 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
 718                         struct sock *sk;
 719                         struct hlist_nulls_node *node;
 720                         struct inet_listen_hashbucket *ilb;
 721
 722                         num = 0;
 723                         ilb = &hashinfo->listening_hash[i];
 724                         spin_lock_bh(&ilb->lock);
 725                         sk_nulls_for_each(sk, node, &ilb->head) {
 726                                 struct inet_sock *inet = inet_sk(sk);
 727
 728                                 if (num < s_num) {
 729                                         num++;
 730                                         continue;
 731                                 }
 732
 733                                 if (r->sdiag_family != AF_UNSPEC &&
 734                                                 sk->sk_family != r->sdiag_family)
 735                                         goto next_listen;
 736
 737                                 if (r->id.idiag_sport != inet->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, r, bc) < 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, r, bc) < 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_mask; 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->sdiag_family != AF_UNSPEC &&
 803                                         sk->sk_family != r->sdiag_family)
 804                                 goto next_normal;
 805                         if (r->id.idiag_sport != inet->inet_sport &&
 806                             r->id.idiag_sport)
 807                                 goto next_normal;
 808                         if (r->id.idiag_dport != inet->inet_dport &&
 809                             r->id.idiag_dport)
 810                                 goto next_normal;
 811                         if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
 812                                 spin_unlock_bh(lock);
 813                                 goto done;
 814                         }
 815 next_normal:
 816                         ++num;
 817                 }
 818
 819                 if (r->idiag_states & TCPF_TIME_WAIT) {
 820                         struct inet_timewait_sock *tw;
 821
 822                         inet_twsk_for_each(tw, node,
 823                                     &head->twchain) {
 824
 825                                 if (num < s_num)
 826                                         goto next_dying;
 827                                 if (r->sdiag_family != AF_UNSPEC &&
 828                                                 tw->tw_family != r->sdiag_family)
 829                                         goto next_dying;
 830                                 if (r->id.idiag_sport != tw->tw_sport &&
 831                                     r->id.idiag_sport)
 832                                         goto next_dying;
 833                                 if (r->id.idiag_dport != tw->tw_dport &&
 834                                     r->id.idiag_dport)
 835                                         goto next_dying;
 836                                 if (inet_twsk_diag_dump(tw, skb, cb, r, bc) < 0) {
 837                                         spin_unlock_bh(lock);
 838                                         goto done;
 839                                 }
 840 next_dying:
 841                                 ++num;
 842                         }
 843                 }
 844                 spin_unlock_bh(lock);
 845         }
 846
 847 done:
 848         cb->args[1] = i;
 849         cb->args[2] = num;
 850 unlock:
 851         inet_diag_unlock_handler(handler);
 852         return skb->len;
 853 }
 854
 855 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
 856 {
 857         struct nlattr *bc = NULL;
 858         int hdrlen = sizeof(struct inet_diag_req);
 859
 860         if (nlmsg_attrlen(cb->nlh, hdrlen))
 861                 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
 862
 863         return __inet_diag_dump(skb, cb, (struct inet_diag_req *)NLMSG_DATA(cb->nlh), bc);
 864 }
 865
 866 static inline int inet_diag_type2proto(int type)
 867 {
 868         switch (type) {
 869         case TCPDIAG_GETSOCK:
 870                 return IPPROTO_TCP;
 871         case DCCPDIAG_GETSOCK:
 872                 return IPPROTO_DCCP;
 873         default:
 874                 return 0;
 875         }
 876 }
 877
 878 static int inet_diag_dump_compat(struct sk_buff *skb, struct netlink_callback *cb)
 879 {
 880         struct inet_diag_req_compat *rc = NLMSG_DATA(cb->nlh);
 881         struct inet_diag_req req;
 882         struct nlattr *bc = NULL;
 883         int hdrlen = sizeof(struct inet_diag_req_compat);
 884
 885         req.sdiag_family = AF_UNSPEC; /* compatibility */
 886         req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
 887         req.idiag_ext = rc->idiag_ext;
 888         req.idiag_states = rc->idiag_states;
 889         req.id = rc->id;
 890
 891         if (nlmsg_attrlen(cb->nlh, hdrlen))
 892                 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
 893
 894         return __inet_diag_dump(skb, cb, &req, bc);
 895 }
 896
 897 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
 898                                const struct nlmsghdr *nlh)
 899 {
 900         struct inet_diag_req_compat *rc = NLMSG_DATA(nlh);
 901         struct inet_diag_req req;
 902
 903         req.sdiag_family = rc->idiag_family;
 904         req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
 905         req.idiag_ext = rc->idiag_ext;
 906         req.idiag_states = rc->idiag_states;
 907         req.id = rc->id;
 908
 909         return inet_diag_get_exact(in_skb, nlh, &req);
 910 }
 911
 912 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
 913 {
 914         int hdrlen = sizeof(struct inet_diag_req_compat);
 915
 916         if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
 917             nlmsg_len(nlh) < hdrlen)
 918                 return -EINVAL;
 919
 920         if (nlh->nlmsg_flags & NLM_F_DUMP) {
 921                 if (nlmsg_attrlen(nlh, hdrlen)) {
 922                         struct nlattr *attr;
 923
 924                         attr = nlmsg_find_attr(nlh, hdrlen,
 925                                                INET_DIAG_REQ_BYTECODE);
 926                         if (attr == NULL ||
 927                             nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
 928                             inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
 929                                 return -EINVAL;
 930                 }
 931
 932                 return netlink_dump_start(sock_diag_nlsk, skb, nlh,
 933                                           inet_diag_dump_compat, NULL, 0);
 934         }
 935
 936         return inet_diag_get_exact_compat(skb, nlh);
 937 }
 938
 939 static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
 940 {
 941         int hdrlen = sizeof(struct inet_diag_req);
 942
 943         if (nlmsg_len(h) < hdrlen)
 944                 return -EINVAL;
 945
 946         if (h->nlmsg_flags & NLM_F_DUMP) {
 947                 if (nlmsg_attrlen(h, hdrlen)) {
 948                         struct nlattr *attr;
 949                         attr = nlmsg_find_attr(h, hdrlen,
 950                                                INET_DIAG_REQ_BYTECODE);
 951                         if (attr == NULL ||
 952                             nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
 953                             inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
 954                                 return -EINVAL;
 955                 }
 956
 957                 return netlink_dump_start(sock_diag_nlsk, skb, h,
 958                                           inet_diag_dump, NULL, 0);
 959         }
 960
 961         return inet_diag_get_exact(skb, h, (struct inet_diag_req *)NLMSG_DATA(h));
 962 }
 963
 964 static struct sock_diag_handler inet_diag_handler = {
 965         .family = AF_INET,
 966         .dump = inet_diag_handler_dump,
 967 };
 968
 969 static struct sock_diag_handler inet6_diag_handler = {
 970         .family = AF_INET6,
 971         .dump = inet_diag_handler_dump,
 972 };
 973
 974 int inet_diag_register(const struct inet_diag_handler *h)
 975 {
 976         const __u16 type = h->idiag_type;
 977         int err = -EINVAL;
 978
 979         if (type >= IPPROTO_MAX)
 980                 goto out;
 981
 982         mutex_lock(&inet_diag_table_mutex);
 983         err = -EEXIST;
 984         if (inet_diag_table[type] == NULL) {
 985                 inet_diag_table[type] = h;
 986                 err = 0;
 987         }
 988         mutex_unlock(&inet_diag_table_mutex);
 989 out:
 990         return err;
 991 }
 992 EXPORT_SYMBOL_GPL(inet_diag_register);
 993
 994 void inet_diag_unregister(const struct inet_diag_handler *h)
 995 {
 996         const __u16 type = h->idiag_type;
 997
 998         if (type >= IPPROTO_MAX)
 999                 return;
1000
1001         mutex_lock(&inet_diag_table_mutex);
1002         inet_diag_table[type] = NULL;
1003         mutex_unlock(&inet_diag_table_mutex);
1004 }
1005 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1006
1007 static int __init inet_diag_init(void)
1008 {
1009         const int inet_diag_table_size = (IPPROTO_MAX *
1010                                           sizeof(struct inet_diag_handler *));
1011         int err = -ENOMEM;
1012
1013         inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1014         if (!inet_diag_table)
1015                 goto out;
1016
1017         err = sock_diag_register(&inet_diag_handler);
1018         if (err)
1019                 goto out_free_nl;
1020
1021         err = sock_diag_register(&inet6_diag_handler);
1022         if (err)
1023                 goto out_free_inet;
1024
1025         sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1026 out:
1027         return err;
1028
1029 out_free_inet:
1030         sock_diag_unregister(&inet_diag_handler);
1031 out_free_nl:
1032         kfree(inet_diag_table);
1033         goto out;
1034 }
1035
1036 static void __exit inet_diag_exit(void)
1037 {
1038         sock_diag_unregister(&inet6_diag_handler);
1039         sock_diag_unregister(&inet_diag_handler);
1040         sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1041         kfree(inet_diag_table);
1042 }
1043
1044 module_init(inet_diag_init);
1045 module_exit(inet_diag_exit);
1046 MODULE_LICENSE("GPL");
1047 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 0);