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
  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 DEFINE_MUTEX(inet_diag_table_mutex);
  54
  55 static const struct inet_diag_handler *inet_diag_lock_handler(int type)
  56 {
  57         if (!inet_diag_table[type])
  58                 request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
  59                                NETLINK_INET_DIAG, type);
  60
  61         mutex_lock(&inet_diag_table_mutex);
  62         if (!inet_diag_table[type])
  63                 return ERR_PTR(-ENOENT);
  64
  65         return inet_diag_table[type];
  66 }
  67
  68 static inline void inet_diag_unlock_handler(
  69         const struct inet_diag_handler *handler)
  70 {
  71         mutex_unlock(&inet_diag_table_mutex);
  72 }
  73
  74 static int inet_csk_diag_fill(struct sock *sk,
  75                               struct sk_buff *skb,
  76                               int ext, u32 pid, u32 seq, u16 nlmsg_flags,
  77                               const struct nlmsghdr *unlh)
  78 {
  79         const struct inet_sock *inet = inet_sk(sk);
  80         const struct inet_connection_sock *icsk = inet_csk(sk);
  81         struct inet_diag_msg *r;
  82         struct nlmsghdr  *nlh;
  83         void *info = NULL;
  84         struct inet_diag_meminfo  *minfo = NULL;
  85         unsigned char    *b = skb_tail_pointer(skb);
  86         const struct inet_diag_handler *handler;
  87
  88         handler = inet_diag_table[unlh->nlmsg_type];
  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         if ((ext & (1 << (INET_DIAG_TOS - 1))) && (sk->sk_family != AF_INET6))
 112                 RTA_PUT_U8(skb, INET_DIAG_TOS, inet->tos);
 113
 114         r->idiag_family = sk->sk_family;
 115         r->idiag_state = sk->sk_state;
 116         r->idiag_timer = 0;
 117         r->idiag_retrans = 0;
 118
 119         r->id.idiag_if = sk->sk_bound_dev_if;
 120         r->id.idiag_cookie[0] = (u32)(unsigned long)sk;
 121         r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
 122
 123         r->id.idiag_sport = inet->inet_sport;
 124         r->id.idiag_dport = inet->inet_dport;
 125         r->id.idiag_src[0] = inet->inet_rcv_saddr;
 126         r->id.idiag_dst[0] = inet->inet_daddr;
 127
 128 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 129         if (r->idiag_family == AF_INET6) {
 130                 const struct ipv6_pinfo *np = inet6_sk(sk);
 131
 132                 *(struct in6_addr *)r->id.idiag_src = np->rcv_saddr;
 133                 *(struct in6_addr *)r->id.idiag_dst = np->daddr;
 134                 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
 135                         RTA_PUT_U8(skb, INET_DIAG_TCLASS, np->tclass);
 136         }
 137 #endif
 138
 139 #define EXPIRES_IN_MS(tmo)  DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
 140
 141         if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
 142                 r->idiag_timer = 1;
 143                 r->idiag_retrans = icsk->icsk_retransmits;
 144                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
 145         } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
 146                 r->idiag_timer = 4;
 147                 r->idiag_retrans = icsk->icsk_probes_out;
 148                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
 149         } else if (timer_pending(&sk->sk_timer)) {
 150                 r->idiag_timer = 2;
 151                 r->idiag_retrans = icsk->icsk_probes_out;
 152                 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
 153         } else {
 154                 r->idiag_timer = 0;
 155                 r->idiag_expires = 0;
 156         }
 157 #undef EXPIRES_IN_MS
 158
 159         r->idiag_uid = sock_i_uid(sk);
 160         r->idiag_inode = sock_i_ino(sk);
 161
 162         if (minfo) {
 163                 minfo->idiag_rmem = sk_rmem_alloc_get(sk);
 164                 minfo->idiag_wmem = sk->sk_wmem_queued;
 165                 minfo->idiag_fmem = sk->sk_forward_alloc;
 166                 minfo->idiag_tmem = sk_wmem_alloc_get(sk);
 167         }
 168
 169         handler->idiag_get_info(sk, r, info);
 170
 171         if (sk->sk_state < TCP_TIME_WAIT &&
 172             icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
 173                 icsk->icsk_ca_ops->get_info(sk, ext, skb);
 174
 175         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
 176         return skb->len;
 177
 178 rtattr_failure:
 179 nlmsg_failure:
 180         nlmsg_trim(skb, b);
 181         return -EMSGSIZE;
 182 }
 183
 184 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
 185                                struct sk_buff *skb, int ext, u32 pid,
 186                                u32 seq, u16 nlmsg_flags,
 187                                const struct nlmsghdr *unlh)
 188 {
 189         long tmo;
 190         struct inet_diag_msg *r;
 191         const unsigned char *previous_tail = skb_tail_pointer(skb);
 192         struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq,
 193                                          unlh->nlmsg_type, sizeof(*r));
 194
 195         r = NLMSG_DATA(nlh);
 196         BUG_ON(tw->tw_state != TCP_TIME_WAIT);
 197
 198         nlh->nlmsg_flags = nlmsg_flags;
 199
 200         tmo = tw->tw_ttd - jiffies;
 201         if (tmo < 0)
 202                 tmo = 0;
 203
 204         r->idiag_family       = tw->tw_family;
 205         r->idiag_retrans      = 0;
 206         r->id.idiag_if        = tw->tw_bound_dev_if;
 207         r->id.idiag_cookie[0] = (u32)(unsigned long)tw;
 208         r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1);
 209         r->id.idiag_sport     = tw->tw_sport;
 210         r->id.idiag_dport     = tw->tw_dport;
 211         r->id.idiag_src[0]    = tw->tw_rcv_saddr;
 212         r->id.idiag_dst[0]    = tw->tw_daddr;
 213         r->idiag_state        = tw->tw_substate;
 214         r->idiag_timer        = 3;
 215         r->idiag_expires      = DIV_ROUND_UP(tmo * 1000, HZ);
 216         r->idiag_rqueue       = 0;
 217         r->idiag_wqueue       = 0;
 218         r->idiag_uid          = 0;
 219         r->idiag_inode        = 0;
 220 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 221         if (tw->tw_family == AF_INET6) {
 222                 const struct inet6_timewait_sock *tw6 =
 223                                                 inet6_twsk((struct sock *)tw);
 224
 225                 *(struct in6_addr *)r->id.idiag_src = tw6->tw_v6_rcv_saddr;
 226                 *(struct in6_addr *)r->id.idiag_dst = tw6->tw_v6_daddr;
 227         }
 228 #endif
 229         nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail;
 230         return skb->len;
 231 nlmsg_failure:
 232         nlmsg_trim(skb, previous_tail);
 233         return -EMSGSIZE;
 234 }
 235
 236 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
 237                         int ext, u32 pid, u32 seq, u16 nlmsg_flags,
 238                         const struct nlmsghdr *unlh)
 239 {
 240         if (sk->sk_state == TCP_TIME_WAIT)
 241                 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
 242                                            skb, ext, pid, seq, nlmsg_flags,
 243                                            unlh);
 244         return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh);
 245 }
 246
 247 static int inet_diag_get_exact(struct sk_buff *in_skb,
 248                                const struct nlmsghdr *nlh)
 249 {
 250         int err;
 251         struct sock *sk;
 252         struct inet_diag_req *req = NLMSG_DATA(nlh);
 253         struct sk_buff *rep;
 254         struct inet_hashinfo *hashinfo;
 255         const struct inet_diag_handler *handler;
 256
 257         handler = inet_diag_lock_handler(nlh->nlmsg_type);
 258         if (IS_ERR(handler)) {
 259                 err = PTR_ERR(handler);
 260                 goto unlock;
 261         }
 262
 263         hashinfo = handler->idiag_hashinfo;
 264         err = -EINVAL;
 265
 266         if (req->idiag_family == AF_INET) {
 267                 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0],
 268                                  req->id.idiag_dport, req->id.idiag_src[0],
 269                                  req->id.idiag_sport, req->id.idiag_if);
 270         }
 271 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 272         else if (req->idiag_family == AF_INET6) {
 273                 sk = inet6_lookup(&init_net, hashinfo,
 274                                   (struct in6_addr *)req->id.idiag_dst,
 275                                   req->id.idiag_dport,
 276                                   (struct in6_addr *)req->id.idiag_src,
 277                                   req->id.idiag_sport,
 278                                   req->id.idiag_if);
 279         }
 280 #endif
 281         else {
 282                 goto unlock;
 283         }
 284
 285         err = -ENOENT;
 286         if (sk == NULL)
 287                 goto unlock;
 288
 289         err = -ESTALE;
 290         if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE ||
 291              req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) &&
 292             ((u32)(unsigned long)sk != req->id.idiag_cookie[0] ||
 293              (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1]))
 294                 goto out;
 295
 296         err = -ENOMEM;
 297         rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
 298                                      sizeof(struct inet_diag_meminfo) +
 299                                      handler->idiag_info_size + 64)),
 300                         GFP_KERNEL);
 301         if (!rep)
 302                 goto out;
 303
 304         err = sk_diag_fill(sk, rep, req->idiag_ext,
 305                            NETLINK_CB(in_skb).pid,
 306                            nlh->nlmsg_seq, 0, nlh);
 307         if (err < 0) {
 308                 WARN_ON(err == -EMSGSIZE);
 309                 kfree_skb(rep);
 310                 goto out;
 311         }
 312         err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid,
 313                               MSG_DONTWAIT);
 314         if (err > 0)
 315                 err = 0;
 316
 317 out:
 318         if (sk) {
 319                 if (sk->sk_state == TCP_TIME_WAIT)
 320                         inet_twsk_put((struct inet_timewait_sock *)sk);
 321                 else
 322                         sock_put(sk);
 323         }
 324 unlock:
 325         inet_diag_unlock_handler(handler);
 326         return err;
 327 }
 328
 329 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
 330 {
 331         int words = bits >> 5;
 332
 333         bits &= 0x1f;
 334
 335         if (words) {
 336                 if (memcmp(a1, a2, words << 2))
 337                         return 0;
 338         }
 339         if (bits) {
 340                 __be32 w1, w2;
 341                 __be32 mask;
 342
 343                 w1 = a1[words];
 344                 w2 = a2[words];
 345
 346                 mask = htonl((0xffffffff) << (32 - bits));
 347
 348                 if ((w1 ^ w2) & mask)
 349                         return 0;
 350         }
 351
 352         return 1;
 353 }
 354
 355
 356 static int inet_diag_bc_run(const void *bc, int len,
 357                             const struct inet_diag_entry *entry)
 358 {
 359         while (len > 0) {
 360                 int yes = 1;
 361                 const struct inet_diag_bc_op *op = bc;
 362
 363                 switch (op->code) {
 364                 case INET_DIAG_BC_NOP:
 365                         break;
 366                 case INET_DIAG_BC_JMP:
 367                         yes = 0;
 368                         break;
 369                 case INET_DIAG_BC_S_GE:
 370                         yes = entry->sport >= op[1].no;
 371                         break;
 372                 case INET_DIAG_BC_S_LE:
 373                         yes = entry->sport <= op[1].no;
 374                         break;
 375                 case INET_DIAG_BC_D_GE:
 376                         yes = entry->dport >= op[1].no;
 377                         break;
 378                 case INET_DIAG_BC_D_LE:
 379                         yes = entry->dport <= op[1].no;
 380                         break;
 381                 case INET_DIAG_BC_AUTO:
 382                         yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
 383                         break;
 384                 case INET_DIAG_BC_S_COND:
 385                 case INET_DIAG_BC_D_COND: {
 386                         struct inet_diag_hostcond *cond;
 387                         __be32 *addr;
 388
 389                         cond = (struct inet_diag_hostcond *)(op + 1);
 390                         if (cond->port != -1 &&
 391                             cond->port != (op->code == INET_DIAG_BC_S_COND ?
 392                                              entry->sport : entry->dport)) {
 393                                 yes = 0;
 394                                 break;
 395                         }
 396
 397                         if (cond->prefix_len == 0)
 398                                 break;
 399
 400                         if (op->code == INET_DIAG_BC_S_COND)
 401                                 addr = entry->saddr;
 402                         else
 403                                 addr = entry->daddr;
 404
 405                         if (bitstring_match(addr, cond->addr,
 406                                             cond->prefix_len))
 407                                 break;
 408                         if (entry->family == AF_INET6 &&
 409                             cond->family == AF_INET) {
 410                                 if (addr[0] == 0 && addr[1] == 0 &&
 411                                     addr[2] == htonl(0xffff) &&
 412                                     bitstring_match(addr + 3, cond->addr,
 413                                                     cond->prefix_len))
 414                                         break;
 415                         }
 416                         yes = 0;
 417                         break;
 418                 }
 419                 }
 420
 421                 if (yes) {
 422                         len -= op->yes;
 423                         bc += op->yes;
 424                 } else {
 425                         len -= op->no;
 426                         bc += op->no;
 427                 }
 428         }
 429         return len == 0;
 430 }
 431
 432 static int valid_cc(const void *bc, int len, int cc)
 433 {
 434         while (len >= 0) {
 435                 const struct inet_diag_bc_op *op = bc;
 436
 437                 if (cc > len)
 438                         return 0;
 439                 if (cc == len)
 440                         return 1;
 441                 if (op->yes < 4 || op->yes & 3)
 442                         return 0;
 443                 len -= op->yes;
 444                 bc  += op->yes;
 445         }
 446         return 0;
 447 }
 448
 449 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
 450 {
 451         const void *bc = bytecode;
 452         int  len = bytecode_len;
 453
 454         while (len > 0) {
 455                 const struct inet_diag_bc_op *op = bc;
 456
 457 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
 458                 switch (op->code) {
 459                 case INET_DIAG_BC_AUTO:
 460                 case INET_DIAG_BC_S_COND:
 461                 case INET_DIAG_BC_D_COND:
 462                 case INET_DIAG_BC_S_GE:
 463                 case INET_DIAG_BC_S_LE:
 464                 case INET_DIAG_BC_D_GE:
 465                 case INET_DIAG_BC_D_LE:
 466                 case INET_DIAG_BC_JMP:
 467                         if (op->no < 4 || op->no > len + 4 || op->no & 3)
 468                                 return -EINVAL;
 469                         if (op->no < len &&
 470                             !valid_cc(bytecode, bytecode_len, len - op->no))
 471                                 return -EINVAL;
 472                         break;
 473                 case INET_DIAG_BC_NOP:
 474                         break;
 475                 default:
 476                         return -EINVAL;
 477                 }
 478                 if (op->yes < 4 || op->yes > len + 4 || op->yes & 3)
 479                         return -EINVAL;
 480                 bc  += op->yes;
 481                 len -= op->yes;
 482         }
 483         return len == 0 ? 0 : -EINVAL;
 484 }
 485
 486 static int inet_csk_diag_dump(struct sock *sk,
 487                               struct sk_buff *skb,
 488                               struct netlink_callback *cb)
 489 {
 490         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
 491
 492         if (nlmsg_attrlen(cb->nlh, sizeof(*r))) {
 493                 struct inet_diag_entry entry;
 494                 const struct nlattr *bc = nlmsg_find_attr(cb->nlh,
 495                                                           sizeof(*r),
 496                                                           INET_DIAG_REQ_BYTECODE);
 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->idiag_ext,
 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 {
 529         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
 530
 531         if (nlmsg_attrlen(cb->nlh, sizeof(*r))) {
 532                 struct inet_diag_entry entry;
 533                 const struct nlattr *bc = nlmsg_find_attr(cb->nlh,
 534                                                           sizeof(*r),
 535                                                           INET_DIAG_REQ_BYTECODE);
 536
 537                 entry.family = tw->tw_family;
 538 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 539                 if (tw->tw_family == AF_INET6) {
 540                         struct inet6_timewait_sock *tw6 =
 541                                                 inet6_twsk((struct sock *)tw);
 542                         entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
 543                         entry.daddr = tw6->tw_v6_daddr.s6_addr32;
 544                 } else
 545 #endif
 546                 {
 547                         entry.saddr = &tw->tw_rcv_saddr;
 548                         entry.daddr = &tw->tw_daddr;
 549                 }
 550                 entry.sport = tw->tw_num;
 551                 entry.dport = ntohs(tw->tw_dport);
 552                 entry.userlocks = 0;
 553
 554                 if (!inet_diag_bc_run(nla_data(bc), nla_len(bc), &entry))
 555                         return 0;
 556         }
 557
 558         return inet_twsk_diag_fill(tw, skb, r->idiag_ext,
 559                                    NETLINK_CB(cb->skb).pid,
 560                                    cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
 561 }
 562
 563 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
 564                               struct request_sock *req, u32 pid, u32 seq,
 565                               const struct nlmsghdr *unlh)
 566 {
 567         const struct inet_request_sock *ireq = inet_rsk(req);
 568         struct inet_sock *inet = inet_sk(sk);
 569         unsigned char *b = skb_tail_pointer(skb);
 570         struct inet_diag_msg *r;
 571         struct nlmsghdr *nlh;
 572         long tmo;
 573
 574         nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
 575         nlh->nlmsg_flags = NLM_F_MULTI;
 576         r = NLMSG_DATA(nlh);
 577
 578         r->idiag_family = sk->sk_family;
 579         r->idiag_state = TCP_SYN_RECV;
 580         r->idiag_timer = 1;
 581         r->idiag_retrans = req->retrans;
 582
 583         r->id.idiag_if = sk->sk_bound_dev_if;
 584         r->id.idiag_cookie[0] = (u32)(unsigned long)req;
 585         r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
 586
 587         tmo = req->expires - jiffies;
 588         if (tmo < 0)
 589                 tmo = 0;
 590
 591         r->id.idiag_sport = inet->inet_sport;
 592         r->id.idiag_dport = ireq->rmt_port;
 593         r->id.idiag_src[0] = ireq->loc_addr;
 594         r->id.idiag_dst[0] = ireq->rmt_addr;
 595         r->idiag_expires = jiffies_to_msecs(tmo);
 596         r->idiag_rqueue = 0;
 597         r->idiag_wqueue = 0;
 598         r->idiag_uid = sock_i_uid(sk);
 599         r->idiag_inode = 0;
 600 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 601         if (r->idiag_family == AF_INET6) {
 602                 *(struct in6_addr *)r->id.idiag_src = inet6_rsk(req)->loc_addr;
 603                 *(struct in6_addr *)r->id.idiag_dst = inet6_rsk(req)->rmt_addr;
 604         }
 605 #endif
 606         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
 607
 608         return skb->len;
 609
 610 nlmsg_failure:
 611         nlmsg_trim(skb, b);
 612         return -1;
 613 }
 614
 615 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
 616                                struct netlink_callback *cb)
 617 {
 618         struct inet_diag_entry entry;
 619         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
 620         struct inet_connection_sock *icsk = inet_csk(sk);
 621         struct listen_sock *lopt;
 622         const struct nlattr *bc = NULL;
 623         struct inet_sock *inet = inet_sk(sk);
 624         int j, s_j;
 625         int reqnum, s_reqnum;
 626         int err = 0;
 627
 628         s_j = cb->args[3];
 629         s_reqnum = cb->args[4];
 630
 631         if (s_j > 0)
 632                 s_j--;
 633
 634         entry.family = sk->sk_family;
 635
 636         read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 637
 638         lopt = icsk->icsk_accept_queue.listen_opt;
 639         if (!lopt || !lopt->qlen)
 640                 goto out;
 641
 642         if (nlmsg_attrlen(cb->nlh, sizeof(*r))) {
 643                 bc = nlmsg_find_attr(cb->nlh, sizeof(*r),
 644                                      INET_DIAG_REQ_BYTECODE);
 645                 entry.sport = inet->inet_num;
 646                 entry.userlocks = sk->sk_userlocks;
 647         }
 648
 649         for (j = s_j; j < lopt->nr_table_entries; j++) {
 650                 struct request_sock *req, *head = lopt->syn_table[j];
 651
 652                 reqnum = 0;
 653                 for (req = head; req; reqnum++, req = req->dl_next) {
 654                         struct inet_request_sock *ireq = inet_rsk(req);
 655
 656                         if (reqnum < s_reqnum)
 657                                 continue;
 658                         if (r->id.idiag_dport != ireq->rmt_port &&
 659                             r->id.idiag_dport)
 660                                 continue;
 661
 662                         if (bc) {
 663                                 entry.saddr =
 664 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 665                                         (entry.family == AF_INET6) ?
 666                                         inet6_rsk(req)->loc_addr.s6_addr32 :
 667 #endif
 668                                         &ireq->loc_addr;
 669                                 entry.daddr =
 670 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 671                                         (entry.family == AF_INET6) ?
 672                                         inet6_rsk(req)->rmt_addr.s6_addr32 :
 673 #endif
 674                                         &ireq->rmt_addr;
 675                                 entry.dport = ntohs(ireq->rmt_port);
 676
 677                                 if (!inet_diag_bc_run(nla_data(bc),
 678                                                       nla_len(bc), &entry))
 679                                         continue;
 680                         }
 681
 682                         err = inet_diag_fill_req(skb, sk, req,
 683                                                NETLINK_CB(cb->skb).pid,
 684                                                cb->nlh->nlmsg_seq, cb->nlh);
 685                         if (err < 0) {
 686                                 cb->args[3] = j + 1;
 687                                 cb->args[4] = reqnum;
 688                                 goto out;
 689                         }
 690                 }
 691
 692                 s_reqnum = 0;
 693         }
 694
 695 out:
 696         read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 697
 698         return err;
 699 }
 700
 701 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
 702 {
 703         int i, num;
 704         int s_i, s_num;
 705         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
 706         const struct inet_diag_handler *handler;
 707         struct inet_hashinfo *hashinfo;
 708
 709         handler = inet_diag_lock_handler(cb->nlh->nlmsg_type);
 710         if (IS_ERR(handler))
 711                 goto unlock;
 712
 713         hashinfo = handler->idiag_hashinfo;
 714
 715         s_i = cb->args[1];
 716         s_num = num = cb->args[2];
 717
 718         if (cb->args[0] == 0) {
 719                 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
 720                         goto skip_listen_ht;
 721
 722                 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
 723                         struct sock *sk;
 724                         struct hlist_nulls_node *node;
 725                         struct inet_listen_hashbucket *ilb;
 726
 727                         num = 0;
 728                         ilb = &hashinfo->listening_hash[i];
 729                         spin_lock_bh(&ilb->lock);
 730                         sk_nulls_for_each(sk, node, &ilb->head) {
 731                                 struct inet_sock *inet = inet_sk(sk);
 732
 733                                 if (num < s_num) {
 734                                         num++;
 735                                         continue;
 736                                 }
 737
 738                                 if (r->id.idiag_sport != inet->inet_sport &&
 739                                     r->id.idiag_sport)
 740                                         goto next_listen;
 741
 742                                 if (!(r->idiag_states & TCPF_LISTEN) ||
 743                                     r->id.idiag_dport ||
 744                                     cb->args[3] > 0)
 745                                         goto syn_recv;
 746
 747                                 if (inet_csk_diag_dump(sk, skb, cb) < 0) {
 748                                         spin_unlock_bh(&ilb->lock);
 749                                         goto done;
 750                                 }
 751
 752 syn_recv:
 753                                 if (!(r->idiag_states & TCPF_SYN_RECV))
 754                                         goto next_listen;
 755
 756                                 if (inet_diag_dump_reqs(skb, sk, cb) < 0) {
 757                                         spin_unlock_bh(&ilb->lock);
 758                                         goto done;
 759                                 }
 760
 761 next_listen:
 762                                 cb->args[3] = 0;
 763                                 cb->args[4] = 0;
 764                                 ++num;
 765                         }
 766                         spin_unlock_bh(&ilb->lock);
 767
 768                         s_num = 0;
 769                         cb->args[3] = 0;
 770                         cb->args[4] = 0;
 771                 }
 772 skip_listen_ht:
 773                 cb->args[0] = 1;
 774                 s_i = num = s_num = 0;
 775         }
 776
 777         if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
 778                 goto unlock;
 779
 780         for (i = s_i; i <= hashinfo->ehash_mask; i++) {
 781                 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
 782                 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
 783                 struct sock *sk;
 784                 struct hlist_nulls_node *node;
 785
 786                 num = 0;
 787
 788                 if (hlist_nulls_empty(&head->chain) &&
 789                         hlist_nulls_empty(&head->twchain))
 790                         continue;
 791
 792                 if (i > s_i)
 793                         s_num = 0;
 794
 795                 spin_lock_bh(lock);
 796                 sk_nulls_for_each(sk, node, &head->chain) {
 797                         struct inet_sock *inet = inet_sk(sk);
 798
 799                         if (num < s_num)
 800                                 goto next_normal;
 801                         if (!(r->idiag_states & (1 << sk->sk_state)))
 802                                 goto next_normal;
 803                         if (r->id.idiag_sport != inet->inet_sport &&
 804                             r->id.idiag_sport)
 805                                 goto next_normal;
 806                         if (r->id.idiag_dport != inet->inet_dport &&
 807                             r->id.idiag_dport)
 808                                 goto next_normal;
 809                         if (inet_csk_diag_dump(sk, skb, cb) < 0) {
 810                                 spin_unlock_bh(lock);
 811                                 goto done;
 812                         }
 813 next_normal:
 814                         ++num;
 815                 }
 816
 817                 if (r->idiag_states & TCPF_TIME_WAIT) {
 818                         struct inet_timewait_sock *tw;
 819
 820                         inet_twsk_for_each(tw, node,
 821                                     &head->twchain) {
 822
 823                                 if (num < s_num)
 824                                         goto next_dying;
 825                                 if (r->id.idiag_sport != tw->tw_sport &&
 826                                     r->id.idiag_sport)
 827                                         goto next_dying;
 828                                 if (r->id.idiag_dport != tw->tw_dport &&
 829                                     r->id.idiag_dport)
 830                                         goto next_dying;
 831                                 if (inet_twsk_diag_dump(tw, skb, cb) < 0) {
 832                                         spin_unlock_bh(lock);
 833                                         goto done;
 834                                 }
 835 next_dying:
 836                                 ++num;
 837                         }
 838                 }
 839                 spin_unlock_bh(lock);
 840         }
 841
 842 done:
 843         cb->args[1] = i;
 844         cb->args[2] = num;
 845 unlock:
 846         inet_diag_unlock_handler(handler);
 847         return skb->len;
 848 }
 849
 850 static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
 851 {
 852         int hdrlen = sizeof(struct inet_diag_req);
 853
 854         if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
 855             nlmsg_len(nlh) < hdrlen)
 856                 return -EINVAL;
 857
 858         if (nlh->nlmsg_flags & NLM_F_DUMP) {
 859                 if (nlmsg_attrlen(nlh, hdrlen)) {
 860                         struct nlattr *attr;
 861
 862                         attr = nlmsg_find_attr(nlh, hdrlen,
 863                                                INET_DIAG_REQ_BYTECODE);
 864                         if (attr == NULL ||
 865                             nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
 866                             inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
 867                                 return -EINVAL;
 868                 }
 869
 870                 return netlink_dump_start(idiagnl, skb, nlh,
 871                                           inet_diag_dump, NULL, 0);
 872         }
 873
 874         return inet_diag_get_exact(skb, nlh);
 875 }
 876
 877 static DEFINE_MUTEX(inet_diag_mutex);
 878
 879 static void inet_diag_rcv(struct sk_buff *skb)
 880 {
 881         mutex_lock(&inet_diag_mutex);
 882         netlink_rcv_skb(skb, &inet_diag_rcv_msg);
 883         mutex_unlock(&inet_diag_mutex);
 884 }
 885
 886 int inet_diag_register(const struct inet_diag_handler *h)
 887 {
 888         const __u16 type = h->idiag_type;
 889         int err = -EINVAL;
 890
 891         if (type >= INET_DIAG_GETSOCK_MAX)
 892                 goto out;
 893
 894         mutex_lock(&inet_diag_table_mutex);
 895         err = -EEXIST;
 896         if (inet_diag_table[type] == NULL) {
 897                 inet_diag_table[type] = h;
 898                 err = 0;
 899         }
 900         mutex_unlock(&inet_diag_table_mutex);
 901 out:
 902         return err;
 903 }
 904 EXPORT_SYMBOL_GPL(inet_diag_register);
 905
 906 void inet_diag_unregister(const struct inet_diag_handler *h)
 907 {
 908         const __u16 type = h->idiag_type;
 909
 910         if (type >= INET_DIAG_GETSOCK_MAX)
 911                 return;
 912
 913         mutex_lock(&inet_diag_table_mutex);
 914         inet_diag_table[type] = NULL;
 915         mutex_unlock(&inet_diag_table_mutex);
 916 }
 917 EXPORT_SYMBOL_GPL(inet_diag_unregister);
 918
 919 static int __init inet_diag_init(void)
 920 {
 921         const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX *
 922                                           sizeof(struct inet_diag_handler *));
 923         int err = -ENOMEM;
 924
 925         inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
 926         if (!inet_diag_table)
 927                 goto out;
 928
 929         idiagnl = netlink_kernel_create(&init_net, NETLINK_INET_DIAG, 0,
 930                                         inet_diag_rcv, NULL, THIS_MODULE);
 931         if (idiagnl == NULL)
 932                 goto out_free_table;
 933         err = 0;
 934 out:
 935         return err;
 936 out_free_table:
 937         kfree(inet_diag_table);
 938         goto out;
 939 }
 940
 941 static void __exit inet_diag_exit(void)
 942 {
 943         netlink_kernel_release(idiagnl);
 944         kfree(inet_diag_table);
 945 }
 946
 947 module_init(inet_diag_init);
 948 module_exit(inet_diag_exit);
 949 MODULE_LICENSE("GPL");
 950 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_INET_DIAG);