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/module.h>
  15 #include <linux/types.h>
  16 #include <linux/fcntl.h>
  17 #include <linux/random.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
  37 static const struct inet_diag_handler **inet_diag_table;
  38
  39 struct inet_diag_entry {
  40         __be32 *saddr;
  41         __be32 *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_pointer(skb);
  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_pointer(skb) - b;
 152         return skb->len;
 153
 154 rtattr_failure:
 155 nlmsg_failure:
 156         nlmsg_trim(skb, b);
 157         return -EMSGSIZE;
 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_pointer(skb);
 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_pointer(skb) - previous_tail;
 210         return skb->len;
 211 nlmsg_failure:
 212         nlmsg_trim(skb, previous_tail);
 213         return -EMSGSIZE;
 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         err = sk_diag_fill(sk, rep, req->idiag_ext,
 279                            NETLINK_CB(in_skb).pid,
 280                            nlh->nlmsg_seq, 0, nlh);
 281         if (err < 0) {
 282                 WARN_ON(err == -EMSGSIZE);
 283                 kfree_skb(rep);
 284                 goto out;
 285         }
 286         err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid,
 287                               MSG_DONTWAIT);
 288         if (err > 0)
 289                 err = 0;
 290
 291 out:
 292         if (sk) {
 293                 if (sk->sk_state == TCP_TIME_WAIT)
 294                         inet_twsk_put((struct inet_timewait_sock *)sk);
 295                 else
 296                         sock_put(sk);
 297         }
 298         return err;
 299 }
 300
 301 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
 302 {
 303         int words = bits >> 5;
 304
 305         bits &= 0x1f;
 306
 307         if (words) {
 308                 if (memcmp(a1, a2, words << 2))
 309                         return 0;
 310         }
 311         if (bits) {
 312                 __be32 w1, w2;
 313                 __be32 mask;
 314
 315                 w1 = a1[words];
 316                 w2 = a2[words];
 317
 318                 mask = htonl((0xffffffff) << (32 - bits));
 319
 320                 if ((w1 ^ w2) & mask)
 321                         return 0;
 322         }
 323
 324         return 1;
 325 }
 326
 327
 328 static int inet_diag_bc_run(const void *bc, int len,
 329                             const struct inet_diag_entry *entry)
 330 {
 331         while (len > 0) {
 332                 int yes = 1;
 333                 const struct inet_diag_bc_op *op = bc;
 334
 335                 switch (op->code) {
 336                 case INET_DIAG_BC_NOP:
 337                         break;
 338                 case INET_DIAG_BC_JMP:
 339                         yes = 0;
 340                         break;
 341                 case INET_DIAG_BC_S_GE:
 342                         yes = entry->sport >= op[1].no;
 343                         break;
 344                 case INET_DIAG_BC_S_LE:
 345                         yes = entry->dport <= op[1].no;
 346                         break;
 347                 case INET_DIAG_BC_D_GE:
 348                         yes = entry->dport >= op[1].no;
 349                         break;
 350                 case INET_DIAG_BC_D_LE:
 351                         yes = entry->dport <= op[1].no;
 352                         break;
 353                 case INET_DIAG_BC_AUTO:
 354                         yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
 355                         break;
 356                 case INET_DIAG_BC_S_COND:
 357                 case INET_DIAG_BC_D_COND: {
 358                         struct inet_diag_hostcond *cond;
 359                         __be32 *addr;
 360
 361                         cond = (struct inet_diag_hostcond *)(op + 1);
 362                         if (cond->port != -1 &&
 363                             cond->port != (op->code == INET_DIAG_BC_S_COND ?
 364                                              entry->sport : entry->dport)) {
 365                                 yes = 0;
 366                                 break;
 367                         }
 368
 369                         if (cond->prefix_len == 0)
 370                                 break;
 371
 372                         if (op->code == INET_DIAG_BC_S_COND)
 373                                 addr = entry->saddr;
 374                         else
 375                                 addr = entry->daddr;
 376
 377                         if (bitstring_match(addr, cond->addr,
 378                                             cond->prefix_len))
 379                                 break;
 380                         if (entry->family == AF_INET6 &&
 381                             cond->family == AF_INET) {
 382                                 if (addr[0] == 0 && addr[1] == 0 &&
 383                                     addr[2] == htonl(0xffff) &&
 384                                     bitstring_match(addr + 3, cond->addr,
 385                                                     cond->prefix_len))
 386                                         break;
 387                         }
 388                         yes = 0;
 389                         break;
 390                 }
 391                 }
 392
 393                 if (yes) {
 394                         len -= op->yes;
 395                         bc += op->yes;
 396                 } else {
 397                         len -= op->no;
 398                         bc += op->no;
 399                 }
 400         }
 401         return (len == 0);
 402 }
 403
 404 static int valid_cc(const void *bc, int len, int cc)
 405 {
 406         while (len >= 0) {
 407                 const struct inet_diag_bc_op *op = bc;
 408
 409                 if (cc > len)
 410                         return 0;
 411                 if (cc == len)
 412                         return 1;
 413                 if (op->yes < 4)
 414                         return 0;
 415                 len -= op->yes;
 416                 bc  += op->yes;
 417         }
 418         return 0;
 419 }
 420
 421 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
 422 {
 423         const unsigned char *bc = bytecode;
 424         int  len = bytecode_len;
 425
 426         while (len > 0) {
 427                 struct inet_diag_bc_op *op = (struct inet_diag_bc_op *)bc;
 428
 429 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
 430                 switch (op->code) {
 431                 case INET_DIAG_BC_AUTO:
 432                 case INET_DIAG_BC_S_COND:
 433                 case INET_DIAG_BC_D_COND:
 434                 case INET_DIAG_BC_S_GE:
 435                 case INET_DIAG_BC_S_LE:
 436                 case INET_DIAG_BC_D_GE:
 437                 case INET_DIAG_BC_D_LE:
 438                         if (op->yes < 4 || op->yes > len + 4)
 439                                 return -EINVAL;
 440                 case INET_DIAG_BC_JMP:
 441                         if (op->no < 4 || op->no > len + 4)
 442                                 return -EINVAL;
 443                         if (op->no < len &&
 444                             !valid_cc(bytecode, bytecode_len, len - op->no))
 445                                 return -EINVAL;
 446                         break;
 447                 case INET_DIAG_BC_NOP:
 448                         if (op->yes < 4 || op->yes > len + 4)
 449                                 return -EINVAL;
 450                         break;
 451                 default:
 452                         return -EINVAL;
 453                 }
 454                 bc  += op->yes;
 455                 len -= op->yes;
 456         }
 457         return len == 0 ? 0 : -EINVAL;
 458 }
 459
 460 static int inet_csk_diag_dump(struct sock *sk,
 461                               struct sk_buff *skb,
 462                               struct netlink_callback *cb)
 463 {
 464         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
 465
 466         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
 467                 struct inet_diag_entry entry;
 468                 struct rtattr *bc = (struct rtattr *)(r + 1);
 469                 struct inet_sock *inet = inet_sk(sk);
 470
 471                 entry.family = sk->sk_family;
 472 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 473                 if (entry.family == AF_INET6) {
 474                         struct ipv6_pinfo *np = inet6_sk(sk);
 475
 476                         entry.saddr = np->rcv_saddr.s6_addr32;
 477                         entry.daddr = np->daddr.s6_addr32;
 478                 } else
 479 #endif
 480                 {
 481                         entry.saddr = &inet->rcv_saddr;
 482                         entry.daddr = &inet->daddr;
 483                 }
 484                 entry.sport = inet->num;
 485                 entry.dport = ntohs(inet->dport);
 486                 entry.userlocks = sk->sk_userlocks;
 487
 488                 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
 489                         return 0;
 490         }
 491
 492         return inet_csk_diag_fill(sk, skb, r->idiag_ext,
 493                                   NETLINK_CB(cb->skb).pid,
 494                                   cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
 495 }
 496
 497 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
 498                                struct sk_buff *skb,
 499                                struct netlink_callback *cb)
 500 {
 501         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
 502
 503         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
 504                 struct inet_diag_entry entry;
 505                 struct rtattr *bc = (struct rtattr *)(r + 1);
 506
 507                 entry.family = tw->tw_family;
 508 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 509                 if (tw->tw_family == AF_INET6) {
 510                         struct inet6_timewait_sock *tw6 =
 511                                                 inet6_twsk((struct sock *)tw);
 512                         entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
 513                         entry.daddr = tw6->tw_v6_daddr.s6_addr32;
 514                 } else
 515 #endif
 516                 {
 517                         entry.saddr = &tw->tw_rcv_saddr;
 518                         entry.daddr = &tw->tw_daddr;
 519                 }
 520                 entry.sport = tw->tw_num;
 521                 entry.dport = ntohs(tw->tw_dport);
 522                 entry.userlocks = 0;
 523
 524                 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
 525                         return 0;
 526         }
 527
 528         return inet_twsk_diag_fill(tw, skb, r->idiag_ext,
 529                                    NETLINK_CB(cb->skb).pid,
 530                                    cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
 531 }
 532
 533 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
 534                               struct request_sock *req, u32 pid, u32 seq,
 535                               const struct nlmsghdr *unlh)
 536 {
 537         const struct inet_request_sock *ireq = inet_rsk(req);
 538         struct inet_sock *inet = inet_sk(sk);
 539         unsigned char *b = skb_tail_pointer(skb);
 540         struct inet_diag_msg *r;
 541         struct nlmsghdr *nlh;
 542         long tmo;
 543
 544         nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
 545         nlh->nlmsg_flags = NLM_F_MULTI;
 546         r = NLMSG_DATA(nlh);
 547
 548         r->idiag_family = sk->sk_family;
 549         r->idiag_state = TCP_SYN_RECV;
 550         r->idiag_timer = 1;
 551         r->idiag_retrans = req->retrans;
 552
 553         r->id.idiag_if = sk->sk_bound_dev_if;
 554         r->id.idiag_cookie[0] = (u32)(unsigned long)req;
 555         r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
 556
 557         tmo = req->expires - jiffies;
 558         if (tmo < 0)
 559                 tmo = 0;
 560
 561         r->id.idiag_sport = inet->sport;
 562         r->id.idiag_dport = ireq->rmt_port;
 563         r->id.idiag_src[0] = ireq->loc_addr;
 564         r->id.idiag_dst[0] = ireq->rmt_addr;
 565         r->idiag_expires = jiffies_to_msecs(tmo);
 566         r->idiag_rqueue = 0;
 567         r->idiag_wqueue = 0;
 568         r->idiag_uid = sock_i_uid(sk);
 569         r->idiag_inode = 0;
 570 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 571         if (r->idiag_family == AF_INET6) {
 572                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
 573                                &inet6_rsk(req)->loc_addr);
 574                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
 575                                &inet6_rsk(req)->rmt_addr);
 576         }
 577 #endif
 578         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
 579
 580         return skb->len;
 581
 582 nlmsg_failure:
 583         nlmsg_trim(skb, b);
 584         return -1;
 585 }
 586
 587 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
 588                                struct netlink_callback *cb)
 589 {
 590         struct inet_diag_entry entry;
 591         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
 592         struct inet_connection_sock *icsk = inet_csk(sk);
 593         struct listen_sock *lopt;
 594         struct rtattr *bc = NULL;
 595         struct inet_sock *inet = inet_sk(sk);
 596         int j, s_j;
 597         int reqnum, s_reqnum;
 598         int err = 0;
 599
 600         s_j = cb->args[3];
 601         s_reqnum = cb->args[4];
 602
 603         if (s_j > 0)
 604                 s_j--;
 605
 606         entry.family = sk->sk_family;
 607
 608         read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 609
 610         lopt = icsk->icsk_accept_queue.listen_opt;
 611         if (!lopt || !lopt->qlen)
 612                 goto out;
 613
 614         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
 615                 bc = (struct rtattr *)(r + 1);
 616                 entry.sport = inet->num;
 617                 entry.userlocks = sk->sk_userlocks;
 618         }
 619
 620         for (j = s_j; j < lopt->nr_table_entries; j++) {
 621                 struct request_sock *req, *head = lopt->syn_table[j];
 622
 623                 reqnum = 0;
 624                 for (req = head; req; reqnum++, req = req->dl_next) {
 625                         struct inet_request_sock *ireq = inet_rsk(req);
 626
 627                         if (reqnum < s_reqnum)
 628                                 continue;
 629                         if (r->id.idiag_dport != ireq->rmt_port &&
 630                             r->id.idiag_dport)
 631                                 continue;
 632
 633                         if (bc) {
 634                                 entry.saddr =
 635 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 636                                         (entry.family == AF_INET6) ?
 637                                         inet6_rsk(req)->loc_addr.s6_addr32 :
 638 #endif
 639                                         &ireq->loc_addr;
 640                                 entry.daddr =
 641 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 642                                         (entry.family == AF_INET6) ?
 643                                         inet6_rsk(req)->rmt_addr.s6_addr32 :
 644 #endif
 645                                         &ireq->rmt_addr;
 646                                 entry.dport = ntohs(ireq->rmt_port);
 647
 648                                 if (!inet_diag_bc_run(RTA_DATA(bc),
 649                                                     RTA_PAYLOAD(bc), &entry))
 650                                         continue;
 651                         }
 652
 653                         err = inet_diag_fill_req(skb, sk, req,
 654                                                NETLINK_CB(cb->skb).pid,
 655                                                cb->nlh->nlmsg_seq, cb->nlh);
 656                         if (err < 0) {
 657                                 cb->args[3] = j + 1;
 658                                 cb->args[4] = reqnum;
 659                                 goto out;
 660                         }
 661                 }
 662
 663                 s_reqnum = 0;
 664         }
 665
 666 out:
 667         read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 668
 669         return err;
 670 }
 671
 672 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
 673 {
 674         int i, num;
 675         int s_i, s_num;
 676         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
 677         const struct inet_diag_handler *handler;
 678         struct inet_hashinfo *hashinfo;
 679
 680         handler = inet_diag_table[cb->nlh->nlmsg_type];
 681         BUG_ON(handler == NULL);
 682         hashinfo = handler->idiag_hashinfo;
 683
 684         s_i = cb->args[1];
 685         s_num = num = cb->args[2];
 686
 687         if (cb->args[0] == 0) {
 688                 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
 689                         goto skip_listen_ht;
 690
 691                 inet_listen_lock(hashinfo);
 692                 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
 693                         struct sock *sk;
 694                         struct hlist_node *node;
 695
 696                         num = 0;
 697                         sk_for_each(sk, node, &hashinfo->listening_hash[i]) {
 698                                 struct inet_sock *inet = inet_sk(sk);
 699
 700                                 if (num < s_num) {
 701                                         num++;
 702                                         continue;
 703                                 }
 704
 705                                 if (r->id.idiag_sport != inet->sport &&
 706                                     r->id.idiag_sport)
 707                                         goto next_listen;
 708
 709                                 if (!(r->idiag_states & TCPF_LISTEN) ||
 710                                     r->id.idiag_dport ||
 711                                     cb->args[3] > 0)
 712                                         goto syn_recv;
 713
 714                                 if (inet_csk_diag_dump(sk, skb, cb) < 0) {
 715                                         inet_listen_unlock(hashinfo);
 716                                         goto done;
 717                                 }
 718
 719 syn_recv:
 720                                 if (!(r->idiag_states & TCPF_SYN_RECV))
 721                                         goto next_listen;
 722
 723                                 if (inet_diag_dump_reqs(skb, sk, cb) < 0) {
 724                                         inet_listen_unlock(hashinfo);
 725                                         goto done;
 726                                 }
 727
 728 next_listen:
 729                                 cb->args[3] = 0;
 730                                 cb->args[4] = 0;
 731                                 ++num;
 732                         }
 733
 734                         s_num = 0;
 735                         cb->args[3] = 0;
 736                         cb->args[4] = 0;
 737                 }
 738                 inet_listen_unlock(hashinfo);
 739 skip_listen_ht:
 740                 cb->args[0] = 1;
 741                 s_i = num = s_num = 0;
 742         }
 743
 744         if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
 745                 return skb->len;
 746
 747         for (i = s_i; i < hashinfo->ehash_size; i++) {
 748                 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
 749                 struct sock *sk;
 750                 struct hlist_node *node;
 751
 752                 if (i > s_i)
 753                         s_num = 0;
 754
 755                 read_lock_bh(&head->lock);
 756                 num = 0;
 757                 sk_for_each(sk, node, &head->chain) {
 758                         struct inet_sock *inet = inet_sk(sk);
 759
 760                         if (num < s_num)
 761                                 goto next_normal;
 762                         if (!(r->idiag_states & (1 << sk->sk_state)))
 763                                 goto next_normal;
 764                         if (r->id.idiag_sport != inet->sport &&
 765                             r->id.idiag_sport)
 766                                 goto next_normal;
 767                         if (r->id.idiag_dport != inet->dport &&
 768                             r->id.idiag_dport)
 769                                 goto next_normal;
 770                         if (inet_csk_diag_dump(sk, skb, cb) < 0) {
 771                                 read_unlock_bh(&head->lock);
 772                                 goto done;
 773                         }
 774 next_normal:
 775                         ++num;
 776                 }
 777
 778                 if (r->idiag_states & TCPF_TIME_WAIT) {
 779                         struct inet_timewait_sock *tw;
 780
 781                         inet_twsk_for_each(tw, node,
 782                                     &head->twchain) {
 783
 784                                 if (num < s_num)
 785                                         goto next_dying;
 786                                 if (r->id.idiag_sport != tw->tw_sport &&
 787                                     r->id.idiag_sport)
 788                                         goto next_dying;
 789                                 if (r->id.idiag_dport != tw->tw_dport &&
 790                                     r->id.idiag_dport)
 791                                         goto next_dying;
 792                                 if (inet_twsk_diag_dump(tw, skb, cb) < 0) {
 793                                         read_unlock_bh(&head->lock);
 794                                         goto done;
 795                                 }
 796 next_dying:
 797                                 ++num;
 798                         }
 799                 }
 800                 read_unlock_bh(&head->lock);
 801         }
 802
 803 done:
 804         cb->args[1] = i;
 805         cb->args[2] = num;
 806         return skb->len;
 807 }
 808
 809 static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
 810 {
 811         int hdrlen = sizeof(struct inet_diag_req);
 812
 813         if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
 814             nlmsg_len(nlh) < hdrlen)
 815                 return -EINVAL;
 816
 817         if (inet_diag_table[nlh->nlmsg_type] == NULL)
 818                 return -ENOENT;
 819
 820         if (nlh->nlmsg_flags & NLM_F_DUMP) {
 821                 if (nlmsg_attrlen(nlh, hdrlen)) {
 822                         struct nlattr *attr;
 823
 824                         attr = nlmsg_find_attr(nlh, hdrlen,
 825                                                INET_DIAG_REQ_BYTECODE);
 826                         if (attr == NULL ||
 827                             nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
 828                             inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
 829                                 return -EINVAL;
 830                 }
 831
 832                 return netlink_dump_start(idiagnl, skb, nlh,
 833                                           inet_diag_dump, NULL);
 834         }
 835
 836         return inet_diag_get_exact(skb, nlh);
 837 }
 838
 839 static void inet_diag_rcv(struct sock *sk, int len)
 840 {
 841         unsigned int qlen = 0;
 842
 843         do {
 844                 netlink_run_queue(sk, &qlen, &inet_diag_rcv_msg);
 845         } while (qlen);
 846 }
 847
 848 static DEFINE_SPINLOCK(inet_diag_register_lock);
 849
 850 int inet_diag_register(const struct inet_diag_handler *h)
 851 {
 852         const __u16 type = h->idiag_type;
 853         int err = -EINVAL;
 854
 855         if (type >= INET_DIAG_GETSOCK_MAX)
 856                 goto out;
 857
 858         spin_lock(&inet_diag_register_lock);
 859         err = -EEXIST;
 860         if (inet_diag_table[type] == NULL) {
 861                 inet_diag_table[type] = h;
 862                 err = 0;
 863         }
 864         spin_unlock(&inet_diag_register_lock);
 865 out:
 866         return err;
 867 }
 868 EXPORT_SYMBOL_GPL(inet_diag_register);
 869
 870 void inet_diag_unregister(const struct inet_diag_handler *h)
 871 {
 872         const __u16 type = h->idiag_type;
 873
 874         if (type >= INET_DIAG_GETSOCK_MAX)
 875                 return;
 876
 877         spin_lock(&inet_diag_register_lock);
 878         inet_diag_table[type] = NULL;
 879         spin_unlock(&inet_diag_register_lock);
 880
 881         synchronize_rcu();
 882 }
 883 EXPORT_SYMBOL_GPL(inet_diag_unregister);
 884
 885 static int __init inet_diag_init(void)
 886 {
 887         const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX *
 888                                           sizeof(struct inet_diag_handler *));
 889         int err = -ENOMEM;
 890
 891         inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
 892         if (!inet_diag_table)
 893                 goto out;
 894
 895         idiagnl = netlink_kernel_create(NETLINK_INET_DIAG, 0, inet_diag_rcv,
 896                                         NULL, THIS_MODULE);
 897         if (idiagnl == NULL)
 898                 goto out_free_table;
 899         err = 0;
 900 out:
 901         return err;
 902 out_free_table:
 903         kfree(inet_diag_table);
 904         goto out;
 905 }
 906
 907 static void __exit inet_diag_exit(void)
 908 {
 909         sock_release(idiagnl->sk_socket);
 910         kfree(inet_diag_table);
 911 }
 912
 913 module_init(inet_diag_init);
 914 module_exit(inet_diag_exit);
 915 MODULE_LICENSE("GPL");