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

   1 /*
   2  * inet_diag.c  Module for monitoring INET transport protocols sockets.
   3  *
   4  * Version:     $Id: inet_diag.c,v 1.3 2002/02/01 22:01:04 davem Exp $
   5  *
   6  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
   7  *
   8  *      This program is free software; you can redistribute it and/or
   9  *      modify it under the terms of the GNU General Public License
  10  *      as published by the Free Software Foundation; either version
  11  *      2 of the License, or (at your option) any later version.
  12  */
  13
  14 #include <linux/config.h>
  15 #include <linux/module.h>
  16 #include <linux/types.h>
  17 #include <linux/fcntl.h>
  18 #include <linux/random.h>
  19 #include <linux/cache.h>
  20 #include <linux/init.h>
  21 #include <linux/time.h>
  22
  23 #include <net/icmp.h>
  24 #include <net/tcp.h>
  25 #include <net/ipv6.h>
  26 #include <net/inet_common.h>
  27 #include <net/inet_connection_sock.h>
  28 #include <net/inet_hashtables.h>
  29 #include <net/inet_timewait_sock.h>
  30 #include <net/inet6_hashtables.h>
  31
  32 #include <linux/inet.h>
  33 #include <linux/stddef.h>
  34
  35 #include <linux/inet_diag.h>
  36
  37 static const struct inet_diag_handler **inet_diag_table;
  38
  39 struct inet_diag_entry {
  40         u32 *saddr;
  41         u32 *daddr;
  42         u16 sport;
  43         u16 dport;
  44         u16 family;
  45         u16 userlocks;
  46 };
  47
  48 static struct sock *idiagnl;
  49
  50 #define INET_DIAG_PUT(skb, attrtype, attrlen) \
  51         RTA_DATA(__RTA_PUT(skb, attrtype, attrlen))
  52
  53 static int inet_csk_diag_fill(struct sock *sk,
  54                               struct sk_buff *skb,
  55                               int ext, u32 pid, u32 seq, u16 nlmsg_flags,
  56                               const struct nlmsghdr *unlh)
  57 {
  58         const struct inet_sock *inet = inet_sk(sk);
  59         const struct inet_connection_sock *icsk = inet_csk(sk);
  60         struct inet_diag_msg *r;
  61         struct nlmsghdr  *nlh;
  62         void *info = NULL;
  63         struct inet_diag_meminfo  *minfo = NULL;
  64         unsigned char    *b = skb->tail;
  65         const struct inet_diag_handler *handler;
  66
  67         handler = inet_diag_table[unlh->nlmsg_type];
  68         BUG_ON(handler == NULL);
  69
  70         nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
  71         nlh->nlmsg_flags = nlmsg_flags;
  72
  73         r = NLMSG_DATA(nlh);
  74         BUG_ON(sk->sk_state == TCP_TIME_WAIT);
  75
  76         if (ext & (1 << (INET_DIAG_MEMINFO - 1)))
  77                 minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo));
  78
  79         if (ext & (1 << (INET_DIAG_INFO - 1)))
  80                 info = INET_DIAG_PUT(skb, INET_DIAG_INFO,
  81                                      handler->idiag_info_size);
  82
  83         if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) {
  84                 const size_t len = strlen(icsk->icsk_ca_ops->name);
  85
  86                 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1),
  87                        icsk->icsk_ca_ops->name);
  88         }
  89
  90         r->idiag_family = sk->sk_family;
  91         r->idiag_state = sk->sk_state;
  92         r->idiag_timer = 0;
  93         r->idiag_retrans = 0;
  94
  95         r->id.idiag_if = sk->sk_bound_dev_if;
  96         r->id.idiag_cookie[0] = (u32)(unsigned long)sk;
  97         r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
  98
  99         r->id.idiag_sport = inet->sport;
 100         r->id.idiag_dport = inet->dport;
 101         r->id.idiag_src[0] = inet->rcv_saddr;
 102         r->id.idiag_dst[0] = inet->daddr;
 103
 104 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 105         if (r->idiag_family == AF_INET6) {
 106                 struct ipv6_pinfo *np = inet6_sk(sk);
 107
 108                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
 109                                &np->rcv_saddr);
 110                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
 111                                &np->daddr);
 112         }
 113 #endif
 114
 115 #define EXPIRES_IN_MS(tmo)  ((tmo - jiffies) * 1000 + HZ - 1) / HZ
 116
 117         if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
 118                 r->idiag_timer = 1;
 119                 r->idiag_retrans = icsk->icsk_retransmits;
 120                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
 121         } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
 122                 r->idiag_timer = 4;
 123                 r->idiag_retrans = icsk->icsk_probes_out;
 124                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
 125         } else if (timer_pending(&sk->sk_timer)) {
 126                 r->idiag_timer = 2;
 127                 r->idiag_retrans = icsk->icsk_probes_out;
 128                 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
 129         } else {
 130                 r->idiag_timer = 0;
 131                 r->idiag_expires = 0;
 132         }
 133 #undef EXPIRES_IN_MS
 134
 135         r->idiag_uid = sock_i_uid(sk);
 136         r->idiag_inode = sock_i_ino(sk);
 137
 138         if (minfo) {
 139                 minfo->idiag_rmem = atomic_read(&sk->sk_rmem_alloc);
 140                 minfo->idiag_wmem = sk->sk_wmem_queued;
 141                 minfo->idiag_fmem = sk->sk_forward_alloc;
 142                 minfo->idiag_tmem = atomic_read(&sk->sk_wmem_alloc);
 143         }
 144
 145         handler->idiag_get_info(sk, r, info);
 146
 147         if (sk->sk_state < TCP_TIME_WAIT &&
 148             icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
 149                 icsk->icsk_ca_ops->get_info(sk, ext, skb);
 150
 151         nlh->nlmsg_len = skb->tail - b;
 152         return skb->len;
 153
 154 rtattr_failure:
 155 nlmsg_failure:
 156         skb_trim(skb, b - skb->data);
 157         return -1;
 158 }
 159
 160 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
 161                                struct sk_buff *skb, int ext, u32 pid,
 162                                u32 seq, u16 nlmsg_flags,
 163                                const struct nlmsghdr *unlh)
 164 {
 165         long tmo;
 166         struct inet_diag_msg *r;
 167         const unsigned char *previous_tail = skb->tail;
 168         struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq,
 169                                          unlh->nlmsg_type, sizeof(*r));
 170
 171         r = NLMSG_DATA(nlh);
 172         BUG_ON(tw->tw_state != TCP_TIME_WAIT);
 173
 174         nlh->nlmsg_flags = nlmsg_flags;
 175
 176         tmo = tw->tw_ttd - jiffies;
 177         if (tmo < 0)
 178                 tmo = 0;
 179
 180         r->idiag_family       = tw->tw_family;
 181         r->idiag_state        = tw->tw_state;
 182         r->idiag_timer        = 0;
 183         r->idiag_retrans      = 0;
 184         r->id.idiag_if        = tw->tw_bound_dev_if;
 185         r->id.idiag_cookie[0] = (u32)(unsigned long)tw;
 186         r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1);
 187         r->id.idiag_sport     = tw->tw_sport;
 188         r->id.idiag_dport     = tw->tw_dport;
 189         r->id.idiag_src[0]    = tw->tw_rcv_saddr;
 190         r->id.idiag_dst[0]    = tw->tw_daddr;
 191         r->idiag_state        = tw->tw_substate;
 192         r->idiag_timer        = 3;
 193         r->idiag_expires      = (tmo * 1000 + HZ - 1) / HZ;
 194         r->idiag_rqueue       = 0;
 195         r->idiag_wqueue       = 0;
 196         r->idiag_uid          = 0;
 197         r->idiag_inode        = 0;
 198 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 199         if (tw->tw_family == AF_INET6) {
 200                 const struct inet6_timewait_sock *tw6 =
 201                                                 inet6_twsk((struct sock *)tw);
 202
 203                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
 204                                &tw6->tw_v6_rcv_saddr);
 205                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
 206                                &tw6->tw_v6_daddr);
 207         }
 208 #endif
 209         nlh->nlmsg_len = skb->tail - previous_tail;
 210         return skb->len;
 211 nlmsg_failure:
 212         skb_trim(skb, previous_tail - skb->data);
 213         return -1;
 214 }
 215
 216 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
 217                         int ext, u32 pid, u32 seq, u16 nlmsg_flags,
 218                         const struct nlmsghdr *unlh)
 219 {
 220         if (sk->sk_state == TCP_TIME_WAIT)
 221                 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
 222                                            skb, ext, pid, seq, nlmsg_flags,
 223                                            unlh);
 224         return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh);
 225 }
 226
 227 static int inet_diag_get_exact(struct sk_buff *in_skb,
 228                                const struct nlmsghdr *nlh)
 229 {
 230         int err;
 231         struct sock *sk;
 232         struct inet_diag_req *req = NLMSG_DATA(nlh);
 233         struct sk_buff *rep;
 234         struct inet_hashinfo *hashinfo;
 235         const struct inet_diag_handler *handler;
 236
 237         handler = inet_diag_table[nlh->nlmsg_type];
 238         BUG_ON(handler == NULL);
 239         hashinfo = handler->idiag_hashinfo;
 240
 241         if (req->idiag_family == AF_INET) {
 242                 sk = inet_lookup(hashinfo, req->id.idiag_dst[0],
 243                                  req->id.idiag_dport, req->id.idiag_src[0],
 244                                  req->id.idiag_sport, req->id.idiag_if);
 245         }
 246 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 247         else if (req->idiag_family == AF_INET6) {
 248                 sk = inet6_lookup(hashinfo,
 249                                   (struct in6_addr *)req->id.idiag_dst,
 250                                   req->id.idiag_dport,
 251                                   (struct in6_addr *)req->id.idiag_src,
 252                                   req->id.idiag_sport,
 253                                   req->id.idiag_if);
 254         }
 255 #endif
 256         else {
 257                 return -EINVAL;
 258         }
 259
 260         if (sk == NULL)
 261                 return -ENOENT;
 262
 263         err = -ESTALE;
 264         if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE ||
 265              req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) &&
 266             ((u32)(unsigned long)sk != req->id.idiag_cookie[0] ||
 267              (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1]))
 268                 goto out;
 269
 270         err = -ENOMEM;
 271         rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
 272                                      sizeof(struct inet_diag_meminfo) +
 273                                      handler->idiag_info_size + 64)),
 274                         GFP_KERNEL);
 275         if (!rep)
 276                 goto out;
 277
 278         if (sk_diag_fill(sk, rep, req->idiag_ext,
 279                          NETLINK_CB(in_skb).pid,
 280                          nlh->nlmsg_seq, 0, nlh) <= 0)
 281                 BUG();
 282
 283         err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid,
 284                               MSG_DONTWAIT);
 285         if (err > 0)
 286                 err = 0;
 287
 288 out:
 289         if (sk) {
 290                 if (sk->sk_state == TCP_TIME_WAIT)
 291                         inet_twsk_put((struct inet_timewait_sock *)sk);
 292                 else
 293                         sock_put(sk);
 294         }
 295         return err;
 296 }
 297
 298 static int bitstring_match(const u32 *a1, const u32 *a2, int bits)
 299 {
 300         int words = bits >> 5;
 301
 302         bits &= 0x1f;
 303
 304         if (words) {
 305                 if (memcmp(a1, a2, words << 2))
 306                         return 0;
 307         }
 308         if (bits) {
 309                 __u32 w1, w2;
 310                 __u32 mask;
 311
 312                 w1 = a1[words];
 313                 w2 = a2[words];
 314
 315                 mask = htonl((0xffffffff) << (32 - bits));
 316
 317                 if ((w1 ^ w2) & mask)
 318                         return 0;
 319         }
 320
 321         return 1;
 322 }
 323
 324
 325 static int inet_diag_bc_run(const void *bc, int len,
 326                             const struct inet_diag_entry *entry)
 327 {
 328         while (len > 0) {
 329                 int yes = 1;
 330                 const struct inet_diag_bc_op *op = bc;
 331
 332                 switch (op->code) {
 333                 case INET_DIAG_BC_NOP:
 334                         break;
 335                 case INET_DIAG_BC_JMP:
 336                         yes = 0;
 337                         break;
 338                 case INET_DIAG_BC_S_GE:
 339                         yes = entry->sport >= op[1].no;
 340                         break;
 341                 case INET_DIAG_BC_S_LE:
 342                         yes = entry->dport <= op[1].no;
 343                         break;
 344                 case INET_DIAG_BC_D_GE:
 345                         yes = entry->dport >= op[1].no;
 346                         break;
 347                 case INET_DIAG_BC_D_LE:
 348                         yes = entry->dport <= op[1].no;
 349                         break;
 350                 case INET_DIAG_BC_AUTO:
 351                         yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
 352                         break;
 353                 case INET_DIAG_BC_S_COND:
 354                 case INET_DIAG_BC_D_COND: {
 355                         struct inet_diag_hostcond *cond;
 356                         u32 *addr;
 357
 358                         cond = (struct inet_diag_hostcond *)(op + 1);
 359                         if (cond->port != -1 &&
 360                             cond->port != (op->code == INET_DIAG_BC_S_COND ?
 361                                              entry->sport : entry->dport)) {
 362                                 yes = 0;
 363                                 break;
 364                         }
 365
 366                         if (cond->prefix_len == 0)
 367                                 break;
 368
 369                         if (op->code == INET_DIAG_BC_S_COND)
 370                                 addr = entry->saddr;
 371                         else
 372                                 addr = entry->daddr;
 373
 374                         if (bitstring_match(addr, cond->addr,
 375                                             cond->prefix_len))
 376                                 break;
 377                         if (entry->family == AF_INET6 &&
 378                             cond->family == AF_INET) {
 379                                 if (addr[0] == 0 && addr[1] == 0 &&
 380                                     addr[2] == htonl(0xffff) &&
 381                                     bitstring_match(addr + 3, cond->addr,
 382                                                     cond->prefix_len))
 383                                         break;
 384                         }
 385                         yes = 0;
 386                         break;
 387                 }
 388                 }
 389
 390                 if (yes) {
 391                         len -= op->yes;
 392                         bc += op->yes;
 393                 } else {
 394                         len -= op->no;
 395                         bc += op->no;
 396                 }
 397         }
 398         return (len == 0);
 399 }
 400
 401 static int valid_cc(const void *bc, int len, int cc)
 402 {
 403         while (len >= 0) {
 404                 const struct inet_diag_bc_op *op = bc;
 405
 406                 if (cc > len)
 407                         return 0;
 408                 if (cc == len)
 409                         return 1;
 410                 if (op->yes < 4)
 411                         return 0;
 412                 len -= op->yes;
 413                 bc  += op->yes;
 414         }
 415         return 0;
 416 }
 417
 418 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
 419 {
 420         const unsigned char *bc = bytecode;
 421         int  len = bytecode_len;
 422
 423         while (len > 0) {
 424                 struct inet_diag_bc_op *op = (struct inet_diag_bc_op *)bc;
 425
 426 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
 427                 switch (op->code) {
 428                 case INET_DIAG_BC_AUTO:
 429                 case INET_DIAG_BC_S_COND:
 430                 case INET_DIAG_BC_D_COND:
 431                 case INET_DIAG_BC_S_GE:
 432                 case INET_DIAG_BC_S_LE:
 433                 case INET_DIAG_BC_D_GE:
 434                 case INET_DIAG_BC_D_LE:
 435                         if (op->yes < 4 || op->yes > len + 4)
 436                                 return -EINVAL;
 437                 case INET_DIAG_BC_JMP:
 438                         if (op->no < 4 || op->no > len + 4)
 439                                 return -EINVAL;
 440                         if (op->no < len &&
 441                             !valid_cc(bytecode, bytecode_len, len - op->no))
 442                                 return -EINVAL;
 443                         break;
 444                 case INET_DIAG_BC_NOP:
 445                         if (op->yes < 4 || op->yes > len + 4)
 446                                 return -EINVAL;
 447                         break;
 448                 default:
 449                         return -EINVAL;
 450                 }
 451                 bc  += op->yes;
 452                 len -= op->yes;
 453         }
 454         return len == 0 ? 0 : -EINVAL;
 455 }
 456
 457 static int inet_csk_diag_dump(struct sock *sk,
 458                               struct sk_buff *skb,
 459                               struct netlink_callback *cb)
 460 {
 461         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
 462
 463         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
 464                 struct inet_diag_entry entry;
 465                 struct rtattr *bc = (struct rtattr *)(r + 1);
 466                 struct inet_sock *inet = inet_sk(sk);
 467
 468                 entry.family = sk->sk_family;
 469 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 470                 if (entry.family == AF_INET6) {
 471                         struct ipv6_pinfo *np = inet6_sk(sk);
 472
 473                         entry.saddr = np->rcv_saddr.s6_addr32;
 474                         entry.daddr = np->daddr.s6_addr32;
 475                 } else
 476 #endif
 477                 {
 478                         entry.saddr = &inet->rcv_saddr;
 479                         entry.daddr = &inet->daddr;
 480                 }
 481                 entry.sport = inet->num;
 482                 entry.dport = ntohs(inet->dport);
 483                 entry.userlocks = sk->sk_userlocks;
 484
 485                 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
 486                         return 0;
 487         }
 488
 489         return inet_csk_diag_fill(sk, skb, r->idiag_ext,
 490                                   NETLINK_CB(cb->skb).pid,
 491                                   cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
 492 }
 493
 494 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
 495                                struct sk_buff *skb,
 496                                struct netlink_callback *cb)
 497 {
 498         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
 499
 500         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
 501                 struct inet_diag_entry entry;
 502                 struct rtattr *bc = (struct rtattr *)(r + 1);
 503
 504                 entry.family = tw->tw_family;
 505 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 506                 if (tw->tw_family == AF_INET6) {
 507                         struct inet6_timewait_sock *tw6 =
 508                                                 inet6_twsk((struct sock *)tw);
 509                         entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
 510                         entry.daddr = tw6->tw_v6_daddr.s6_addr32;
 511                 } else
 512 #endif
 513                 {
 514                         entry.saddr = &tw->tw_rcv_saddr;
 515                         entry.daddr = &tw->tw_daddr;
 516                 }
 517                 entry.sport = tw->tw_num;
 518                 entry.dport = ntohs(tw->tw_dport);
 519                 entry.userlocks = 0;
 520
 521                 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
 522                         return 0;
 523         }
 524
 525         return inet_twsk_diag_fill(tw, skb, r->idiag_ext,
 526                                    NETLINK_CB(cb->skb).pid,
 527                                    cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
 528 }
 529
 530 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
 531                               struct request_sock *req, u32 pid, u32 seq,
 532                               const struct nlmsghdr *unlh)
 533 {
 534         const struct inet_request_sock *ireq = inet_rsk(req);
 535         struct inet_sock *inet = inet_sk(sk);
 536         unsigned char *b = skb->tail;
 537         struct inet_diag_msg *r;
 538         struct nlmsghdr *nlh;
 539         long tmo;
 540
 541         nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
 542         nlh->nlmsg_flags = NLM_F_MULTI;
 543         r = NLMSG_DATA(nlh);
 544
 545         r->idiag_family = sk->sk_family;
 546         r->idiag_state = TCP_SYN_RECV;
 547         r->idiag_timer = 1;
 548         r->idiag_retrans = req->retrans;
 549
 550         r->id.idiag_if = sk->sk_bound_dev_if;
 551         r->id.idiag_cookie[0] = (u32)(unsigned long)req;
 552         r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
 553
 554         tmo = req->expires - jiffies;
 555         if (tmo < 0)
 556                 tmo = 0;
 557
 558         r->id.idiag_sport = inet->sport;
 559         r->id.idiag_dport = ireq->rmt_port;
 560         r->id.idiag_src[0] = ireq->loc_addr;
 561         r->id.idiag_dst[0] = ireq->rmt_addr;
 562         r->idiag_expires = jiffies_to_msecs(tmo);
 563         r->idiag_rqueue = 0;
 564         r->idiag_wqueue = 0;
 565         r->idiag_uid = sock_i_uid(sk);
 566         r->idiag_inode = 0;
 567 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 568         if (r->idiag_family == AF_INET6) {
 569                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
 570                                &inet6_rsk(req)->loc_addr);
 571                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
 572                                &inet6_rsk(req)->rmt_addr);
 573         }
 574 #endif
 575         nlh->nlmsg_len = skb->tail - b;
 576
 577         return skb->len;
 578
 579 nlmsg_failure:
 580         skb_trim(skb, b - skb->data);
 581         return -1;
 582 }
 583
 584 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
 585                                struct netlink_callback *cb)
 586 {
 587         struct inet_diag_entry entry;
 588         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
 589         struct inet_connection_sock *icsk = inet_csk(sk);
 590         struct listen_sock *lopt;
 591         struct rtattr *bc = NULL;
 592         struct inet_sock *inet = inet_sk(sk);
 593         int j, s_j;
 594         int reqnum, s_reqnum;
 595         int err = 0;
 596
 597         s_j = cb->args[3];
 598         s_reqnum = cb->args[4];
 599
 600         if (s_j > 0)
 601                 s_j--;
 602
 603         entry.family = sk->sk_family;
 604
 605         read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 606
 607         lopt = icsk->icsk_accept_queue.listen_opt;
 608         if (!lopt || !lopt->qlen)
 609                 goto out;
 610
 611         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
 612                 bc = (struct rtattr *)(r + 1);
 613                 entry.sport = inet->num;
 614                 entry.userlocks = sk->sk_userlocks;
 615         }
 616
 617         for (j = s_j; j < lopt->nr_table_entries; j++) {
 618                 struct request_sock *req, *head = lopt->syn_table[j];
 619
 620                 reqnum = 0;
 621                 for (req = head; req; reqnum++, req = req->dl_next) {
 622                         struct inet_request_sock *ireq = inet_rsk(req);
 623
 624                         if (reqnum < s_reqnum)
 625                                 continue;
 626                         if (r->id.idiag_dport != ireq->rmt_port &&
 627                             r->id.idiag_dport)
 628                                 continue;
 629
 630                         if (bc) {
 631                                 entry.saddr =
 632 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 633                                         (entry.family == AF_INET6) ?
 634                                         inet6_rsk(req)->loc_addr.s6_addr32 :
 635 #endif
 636                                         &ireq->loc_addr;
 637                                 entry.daddr =
 638 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 639                                         (entry.family == AF_INET6) ?
 640                                         inet6_rsk(req)->rmt_addr.s6_addr32 :
 641 #endif
 642                                         &ireq->rmt_addr;
 643                                 entry.dport = ntohs(ireq->rmt_port);
 644
 645                                 if (!inet_diag_bc_run(RTA_DATA(bc),
 646                                                     RTA_PAYLOAD(bc), &entry))
 647                                         continue;
 648                         }
 649
 650                         err = inet_diag_fill_req(skb, sk, req,
 651                                                NETLINK_CB(cb->skb).pid,
 652                                                cb->nlh->nlmsg_seq, cb->nlh);
 653                         if (err < 0) {
 654                                 cb->args[3] = j + 1;
 655                                 cb->args[4] = reqnum;
 656                                 goto out;
 657                         }
 658                 }
 659
 660                 s_reqnum = 0;
 661         }
 662
 663 out:
 664         read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 665
 666         return err;
 667 }
 668
 669 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
 670 {
 671         int i, num;
 672         int s_i, s_num;
 673         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
 674         const struct inet_diag_handler *handler;
 675         struct inet_hashinfo *hashinfo;
 676
 677         handler = inet_diag_table[cb->nlh->nlmsg_type];
 678         BUG_ON(handler == NULL);
 679         hashinfo = handler->idiag_hashinfo;
 680
 681         s_i = cb->args[1];
 682         s_num = num = cb->args[2];
 683
 684         if (cb->args[0] == 0) {
 685                 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
 686                         goto skip_listen_ht;
 687
 688                 inet_listen_lock(hashinfo);
 689                 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
 690                         struct sock *sk;
 691                         struct hlist_node *node;
 692
 693                         num = 0;
 694                         sk_for_each(sk, node, &hashinfo->listening_hash[i]) {
 695                                 struct inet_sock *inet = inet_sk(sk);
 696
 697                                 if (num < s_num) {
 698                                         num++;
 699                                         continue;
 700                                 }
 701
 702                                 if (r->id.idiag_sport != inet->sport &&
 703                                     r->id.idiag_sport)
 704                                         goto next_listen;
 705
 706                                 if (!(r->idiag_states & TCPF_LISTEN) ||
 707                                     r->id.idiag_dport ||
 708                                     cb->args[3] > 0)
 709                                         goto syn_recv;
 710
 711                                 if (inet_csk_diag_dump(sk, skb, cb) < 0) {
 712                                         inet_listen_unlock(hashinfo);
 713                                         goto done;
 714                                 }
 715
 716 syn_recv:
 717                                 if (!(r->idiag_states & TCPF_SYN_RECV))
 718                                         goto next_listen;
 719
 720                                 if (inet_diag_dump_reqs(skb, sk, cb) < 0) {
 721                                         inet_listen_unlock(hashinfo);
 722                                         goto done;
 723                                 }
 724
 725 next_listen:
 726                                 cb->args[3] = 0;
 727                                 cb->args[4] = 0;
 728                                 ++num;
 729                         }
 730
 731                         s_num = 0;
 732                         cb->args[3] = 0;
 733                         cb->args[4] = 0;
 734                 }
 735                 inet_listen_unlock(hashinfo);
 736 skip_listen_ht:
 737                 cb->args[0] = 1;
 738                 s_i = num = s_num = 0;
 739         }
 740
 741         if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
 742                 return skb->len;
 743
 744         for (i = s_i; i < hashinfo->ehash_size; i++) {
 745                 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
 746                 struct sock *sk;
 747                 struct hlist_node *node;
 748
 749                 if (i > s_i)
 750                         s_num = 0;
 751
 752                 read_lock_bh(&head->lock);
 753                 num = 0;
 754                 sk_for_each(sk, node, &head->chain) {
 755                         struct inet_sock *inet = inet_sk(sk);
 756
 757                         if (num < s_num)
 758                                 goto next_normal;
 759                         if (!(r->idiag_states & (1 << sk->sk_state)))
 760                                 goto next_normal;
 761                         if (r->id.idiag_sport != inet->sport &&
 762                             r->id.idiag_sport)
 763                                 goto next_normal;
 764                         if (r->id.idiag_dport != inet->dport &&
 765                             r->id.idiag_dport)
 766                                 goto next_normal;
 767                         if (inet_csk_diag_dump(sk, skb, cb) < 0) {
 768                                 read_unlock_bh(&head->lock);
 769                                 goto done;
 770                         }
 771 next_normal:
 772                         ++num;
 773                 }
 774
 775                 if (r->idiag_states & TCPF_TIME_WAIT) {
 776                         struct inet_timewait_sock *tw;
 777
 778                         inet_twsk_for_each(tw, node,
 779                                     &hashinfo->ehash[i + hashinfo->ehash_size].chain) {
 780
 781                                 if (num < s_num)
 782                                         goto next_dying;
 783                                 if (r->id.idiag_sport != tw->tw_sport &&
 784                                     r->id.idiag_sport)
 785                                         goto next_dying;
 786                                 if (r->id.idiag_dport != tw->tw_dport &&
 787                                     r->id.idiag_dport)
 788                                         goto next_dying;
 789                                 if (inet_twsk_diag_dump(tw, skb, cb) < 0) {
 790                                         read_unlock_bh(&head->lock);
 791                                         goto done;
 792                                 }
 793 next_dying:
 794                                 ++num;
 795                         }
 796                 }
 797                 read_unlock_bh(&head->lock);
 798         }
 799
 800 done:
 801         cb->args[1] = i;
 802         cb->args[2] = num;
 803         return skb->len;
 804 }
 805
 806 static inline int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
 807 {
 808         if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
 809                 return 0;
 810
 811         if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX)
 812                 goto err_inval;
 813
 814         if (inet_diag_table[nlh->nlmsg_type] == NULL)
 815                 return -ENOENT;
 816
 817         if (NLMSG_LENGTH(sizeof(struct inet_diag_req)) > skb->len)
 818                 goto err_inval;
 819
 820         if (nlh->nlmsg_flags&NLM_F_DUMP) {
 821                 if (nlh->nlmsg_len >
 822                     (4 + NLMSG_SPACE(sizeof(struct inet_diag_req)))) {
 823                         struct rtattr *rta = (void *)(NLMSG_DATA(nlh) +
 824                                                  sizeof(struct inet_diag_req));
 825                         if (rta->rta_type != INET_DIAG_REQ_BYTECODE ||
 826                             rta->rta_len < 8 ||
 827                             rta->rta_len >
 828                             (nlh->nlmsg_len -
 829                              NLMSG_SPACE(sizeof(struct inet_diag_req))))
 830                                 goto err_inval;
 831                         if (inet_diag_bc_audit(RTA_DATA(rta), RTA_PAYLOAD(rta)))
 832                                 goto err_inval;
 833                 }
 834                 return netlink_dump_start(idiagnl, skb, nlh,
 835                                           inet_diag_dump, NULL);
 836         } else
 837                 return inet_diag_get_exact(skb, nlh);
 838
 839 err_inval:
 840         return -EINVAL;
 841 }
 842
 843
 844 static inline void inet_diag_rcv_skb(struct sk_buff *skb)
 845 {
 846         if (skb->len >= NLMSG_SPACE(0)) {
 847                 int err;
 848                 struct nlmsghdr *nlh = (struct nlmsghdr *)skb->data;
 849
 850                 if (nlh->nlmsg_len < sizeof(*nlh) ||
 851                     skb->len < nlh->nlmsg_len)
 852                         return;
 853                 err = inet_diag_rcv_msg(skb, nlh);
 854                 if (err || nlh->nlmsg_flags & NLM_F_ACK)
 855                         netlink_ack(skb, nlh, err);
 856         }
 857 }
 858
 859 static void inet_diag_rcv(struct sock *sk, int len)
 860 {
 861         struct sk_buff *skb;
 862         unsigned int qlen = skb_queue_len(&sk->sk_receive_queue);
 863
 864         while (qlen-- && (skb = skb_dequeue(&sk->sk_receive_queue))) {
 865                 inet_diag_rcv_skb(skb);
 866                 kfree_skb(skb);
 867         }
 868 }
 869
 870 static DEFINE_SPINLOCK(inet_diag_register_lock);
 871
 872 int inet_diag_register(const struct inet_diag_handler *h)
 873 {
 874         const __u16 type = h->idiag_type;
 875         int err = -EINVAL;
 876
 877         if (type >= INET_DIAG_GETSOCK_MAX)
 878                 goto out;
 879
 880         spin_lock(&inet_diag_register_lock);
 881         err = -EEXIST;
 882         if (inet_diag_table[type] == NULL) {
 883                 inet_diag_table[type] = h;
 884                 err = 0;
 885         }
 886         spin_unlock(&inet_diag_register_lock);
 887 out:
 888         return err;
 889 }
 890 EXPORT_SYMBOL_GPL(inet_diag_register);
 891
 892 void inet_diag_unregister(const struct inet_diag_handler *h)
 893 {
 894         const __u16 type = h->idiag_type;
 895
 896         if (type >= INET_DIAG_GETSOCK_MAX)
 897                 return;
 898
 899         spin_lock(&inet_diag_register_lock);
 900         inet_diag_table[type] = NULL;
 901         spin_unlock(&inet_diag_register_lock);
 902
 903         synchronize_rcu();
 904 }
 905 EXPORT_SYMBOL_GPL(inet_diag_unregister);
 906
 907 static int __init inet_diag_init(void)
 908 {
 909         const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX *
 910                                           sizeof(struct inet_diag_handler *));
 911         int err = -ENOMEM;
 912
 913         inet_diag_table = kmalloc(inet_diag_table_size, GFP_KERNEL);
 914         if (!inet_diag_table)
 915                 goto out;
 916
 917         memset(inet_diag_table, 0, inet_diag_table_size);
 918         idiagnl = netlink_kernel_create(NETLINK_INET_DIAG, 0, inet_diag_rcv,
 919                                         THIS_MODULE);
 920         if (idiagnl == NULL)
 921                 goto out_free_table;
 922         err = 0;
 923 out:
 924         return err;
 925 out_free_table:
 926         kfree(inet_diag_table);
 927         goto out;
 928 }
 929
 930 static void __exit inet_diag_exit(void)
 931 {
 932         sock_release(idiagnl->sk_socket);
 933         kfree(inet_diag_table);
 934 }
 935
 936 module_init(inet_diag_init);
 937 module_exit(inet_diag_exit);
 938 MODULE_LICENSE("GPL");