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/cache.h>
  18 #include <linux/init.h>
  19 #include <linux/time.h>
  20
  21 #include <net/icmp.h>
  22 #include <net/tcp.h>
  23 #include <net/ipv6.h>
  24 #include <net/inet_common.h>
  25 #include <net/inet_connection_sock.h>
  26 #include <net/inet_hashtables.h>
  27 #include <net/inet_timewait_sock.h>
  28 #include <net/inet6_hashtables.h>
  29 #include <net/netlink.h>
  30
  31 #include <linux/inet.h>
  32 #include <linux/stddef.h>
  33
  34 #include <linux/inet_diag.h>
  35
  36 static const struct inet_diag_handler **inet_diag_table;
  37
  38 struct inet_diag_entry {
  39         __be32 *saddr;
  40         __be32 *daddr;
  41         u16 sport;
  42         u16 dport;
  43         u16 family;
  44         u16 userlocks;
  45 };
  46
  47 static struct sock *idiagnl;
  48
  49 #define INET_DIAG_PUT(skb, attrtype, attrlen) \
  50         RTA_DATA(__RTA_PUT(skb, attrtype, attrlen))
  51
  52 static DEFINE_MUTEX(inet_diag_table_mutex);
  53
  54 static const struct inet_diag_handler *inet_diag_lock_handler(int type)
  55 {
  56         if (!inet_diag_table[type])
  57                 request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
  58                                NETLINK_INET_DIAG, type);
  59
  60         mutex_lock(&inet_diag_table_mutex);
  61         if (!inet_diag_table[type])
  62                 return ERR_PTR(-ENOENT);
  63
  64         return inet_diag_table[type];
  65 }
  66
  67 static inline void inet_diag_unlock_handler(
  68         const struct inet_diag_handler *handler)
  69 {
  70         mutex_unlock(&inet_diag_table_mutex);
  71 }
  72
  73 static int inet_csk_diag_fill(struct sock *sk,
  74                               struct sk_buff *skb,
  75                               int ext, u32 pid, u32 seq, u16 nlmsg_flags,
  76                               const struct nlmsghdr *unlh)
  77 {
  78         const struct inet_sock *inet = inet_sk(sk);
  79         const struct inet_connection_sock *icsk = inet_csk(sk);
  80         struct inet_diag_msg *r;
  81         struct nlmsghdr  *nlh;
  82         void *info = NULL;
  83         struct inet_diag_meminfo  *minfo = NULL;
  84         unsigned char    *b = skb_tail_pointer(skb);
  85         const struct inet_diag_handler *handler;
  86
  87         handler = inet_diag_table[unlh->nlmsg_type];
  88         BUG_ON(handler == NULL);
  89
  90         nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
  91         nlh->nlmsg_flags = nlmsg_flags;
  92
  93         r = NLMSG_DATA(nlh);
  94         BUG_ON(sk->sk_state == TCP_TIME_WAIT);
  95
  96         if (ext & (1 << (INET_DIAG_MEMINFO - 1)))
  97                 minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo));
  98
  99         if (ext & (1 << (INET_DIAG_INFO - 1)))
 100                 info = INET_DIAG_PUT(skb, INET_DIAG_INFO,
 101                                      handler->idiag_info_size);
 102
 103         if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) {
 104                 const size_t len = strlen(icsk->icsk_ca_ops->name);
 105
 106                 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1),
 107                        icsk->icsk_ca_ops->name);
 108         }
 109
 110         r->idiag_family = sk->sk_family;
 111         r->idiag_state = sk->sk_state;
 112         r->idiag_timer = 0;
 113         r->idiag_retrans = 0;
 114
 115         r->id.idiag_if = sk->sk_bound_dev_if;
 116         r->id.idiag_cookie[0] = (u32)(unsigned long)sk;
 117         r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
 118
 119         r->id.idiag_sport = inet->sport;
 120         r->id.idiag_dport = inet->dport;
 121         r->id.idiag_src[0] = inet->rcv_saddr;
 122         r->id.idiag_dst[0] = inet->daddr;
 123
 124 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 125         if (r->idiag_family == AF_INET6) {
 126                 struct ipv6_pinfo *np = inet6_sk(sk);
 127
 128                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
 129                                &np->rcv_saddr);
 130                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
 131                                &np->daddr);
 132         }
 133 #endif
 134
 135 #define EXPIRES_IN_MS(tmo)  DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
 136
 137         if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
 138                 r->idiag_timer = 1;
 139                 r->idiag_retrans = icsk->icsk_retransmits;
 140                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
 141         } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
 142                 r->idiag_timer = 4;
 143                 r->idiag_retrans = icsk->icsk_probes_out;
 144                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
 145         } else if (timer_pending(&sk->sk_timer)) {
 146                 r->idiag_timer = 2;
 147                 r->idiag_retrans = icsk->icsk_probes_out;
 148                 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
 149         } else {
 150                 r->idiag_timer = 0;
 151                 r->idiag_expires = 0;
 152         }
 153 #undef EXPIRES_IN_MS
 154
 155         r->idiag_uid = sock_i_uid(sk);
 156         r->idiag_inode = sock_i_ino(sk);
 157
 158         if (minfo) {
 159                 minfo->idiag_rmem = sk_rmem_alloc_get(sk);
 160                 minfo->idiag_wmem = sk->sk_wmem_queued;
 161                 minfo->idiag_fmem = sk->sk_forward_alloc;
 162                 minfo->idiag_tmem = sk_wmem_alloc_get(sk);
 163         }
 164
 165         handler->idiag_get_info(sk, r, info);
 166
 167         if (sk->sk_state < TCP_TIME_WAIT &&
 168             icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
 169                 icsk->icsk_ca_ops->get_info(sk, ext, skb);
 170
 171         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
 172         return skb->len;
 173
 174 rtattr_failure:
 175 nlmsg_failure:
 176         nlmsg_trim(skb, b);
 177         return -EMSGSIZE;
 178 }
 179
 180 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
 181                                struct sk_buff *skb, int ext, u32 pid,
 182                                u32 seq, u16 nlmsg_flags,
 183                                const struct nlmsghdr *unlh)
 184 {
 185         long tmo;
 186         struct inet_diag_msg *r;
 187         const unsigned char *previous_tail = skb_tail_pointer(skb);
 188         struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq,
 189                                          unlh->nlmsg_type, sizeof(*r));
 190
 191         r = NLMSG_DATA(nlh);
 192         BUG_ON(tw->tw_state != TCP_TIME_WAIT);
 193
 194         nlh->nlmsg_flags = nlmsg_flags;
 195
 196         tmo = tw->tw_ttd - jiffies;
 197         if (tmo < 0)
 198                 tmo = 0;
 199
 200         r->idiag_family       = tw->tw_family;
 201         r->idiag_retrans      = 0;
 202         r->id.idiag_if        = tw->tw_bound_dev_if;
 203         r->id.idiag_cookie[0] = (u32)(unsigned long)tw;
 204         r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1);
 205         r->id.idiag_sport     = tw->tw_sport;
 206         r->id.idiag_dport     = tw->tw_dport;
 207         r->id.idiag_src[0]    = tw->tw_rcv_saddr;
 208         r->id.idiag_dst[0]    = tw->tw_daddr;
 209         r->idiag_state        = tw->tw_substate;
 210         r->idiag_timer        = 3;
 211         r->idiag_expires      = DIV_ROUND_UP(tmo * 1000, HZ);
 212         r->idiag_rqueue       = 0;
 213         r->idiag_wqueue       = 0;
 214         r->idiag_uid          = 0;
 215         r->idiag_inode        = 0;
 216 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 217         if (tw->tw_family == AF_INET6) {
 218                 const struct inet6_timewait_sock *tw6 =
 219                                                 inet6_twsk((struct sock *)tw);
 220
 221                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
 222                                &tw6->tw_v6_rcv_saddr);
 223                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
 224                                &tw6->tw_v6_daddr);
 225         }
 226 #endif
 227         nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail;
 228         return skb->len;
 229 nlmsg_failure:
 230         nlmsg_trim(skb, previous_tail);
 231         return -EMSGSIZE;
 232 }
 233
 234 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
 235                         int ext, u32 pid, u32 seq, u16 nlmsg_flags,
 236                         const struct nlmsghdr *unlh)
 237 {
 238         if (sk->sk_state == TCP_TIME_WAIT)
 239                 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
 240                                            skb, ext, pid, seq, nlmsg_flags,
 241                                            unlh);
 242         return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh);
 243 }
 244
 245 static int inet_diag_get_exact(struct sk_buff *in_skb,
 246                                const struct nlmsghdr *nlh)
 247 {
 248         int err;
 249         struct sock *sk;
 250         struct inet_diag_req *req = NLMSG_DATA(nlh);
 251         struct sk_buff *rep;
 252         struct inet_hashinfo *hashinfo;
 253         const struct inet_diag_handler *handler;
 254
 255         handler = inet_diag_lock_handler(nlh->nlmsg_type);
 256         if (IS_ERR(handler)) {
 257                 err = PTR_ERR(handler);
 258                 goto unlock;
 259         }
 260
 261         hashinfo = handler->idiag_hashinfo;
 262         err = -EINVAL;
 263
 264         if (req->idiag_family == AF_INET) {
 265                 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0],
 266                                  req->id.idiag_dport, req->id.idiag_src[0],
 267                                  req->id.idiag_sport, req->id.idiag_if);
 268         }
 269 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 270         else if (req->idiag_family == AF_INET6) {
 271                 sk = inet6_lookup(&init_net, hashinfo,
 272                                   (struct in6_addr *)req->id.idiag_dst,
 273                                   req->id.idiag_dport,
 274                                   (struct in6_addr *)req->id.idiag_src,
 275                                   req->id.idiag_sport,
 276                                   req->id.idiag_if);
 277         }
 278 #endif
 279         else {
 280                 goto unlock;
 281         }
 282
 283         err = -ENOENT;
 284         if (sk == NULL)
 285                 goto unlock;
 286
 287         err = -ESTALE;
 288         if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE ||
 289              req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) &&
 290             ((u32)(unsigned long)sk != req->id.idiag_cookie[0] ||
 291              (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1]))
 292                 goto out;
 293
 294         err = -ENOMEM;
 295         rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
 296                                      sizeof(struct inet_diag_meminfo) +
 297                                      handler->idiag_info_size + 64)),
 298                         GFP_KERNEL);
 299         if (!rep)
 300                 goto out;
 301
 302         err = sk_diag_fill(sk, rep, req->idiag_ext,
 303                            NETLINK_CB(in_skb).pid,
 304                            nlh->nlmsg_seq, 0, nlh);
 305         if (err < 0) {
 306                 WARN_ON(err == -EMSGSIZE);
 307                 kfree_skb(rep);
 308                 goto out;
 309         }
 310         err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid,
 311                               MSG_DONTWAIT);
 312         if (err > 0)
 313                 err = 0;
 314
 315 out:
 316         if (sk) {
 317                 if (sk->sk_state == TCP_TIME_WAIT)
 318                         inet_twsk_put((struct inet_timewait_sock *)sk);
 319                 else
 320                         sock_put(sk);
 321         }
 322 unlock:
 323         inet_diag_unlock_handler(handler);
 324         return err;
 325 }
 326
 327 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
 328 {
 329         int words = bits >> 5;
 330
 331         bits &= 0x1f;
 332
 333         if (words) {
 334                 if (memcmp(a1, a2, words << 2))
 335                         return 0;
 336         }
 337         if (bits) {
 338                 __be32 w1, w2;
 339                 __be32 mask;
 340
 341                 w1 = a1[words];
 342                 w2 = a2[words];
 343
 344                 mask = htonl((0xffffffff) << (32 - bits));
 345
 346                 if ((w1 ^ w2) & mask)
 347                         return 0;
 348         }
 349
 350         return 1;
 351 }
 352
 353
 354 static int inet_diag_bc_run(const void *bc, int len,
 355                             const struct inet_diag_entry *entry)
 356 {
 357         while (len > 0) {
 358                 int yes = 1;
 359                 const struct inet_diag_bc_op *op = bc;
 360
 361                 switch (op->code) {
 362                 case INET_DIAG_BC_NOP:
 363                         break;
 364                 case INET_DIAG_BC_JMP:
 365                         yes = 0;
 366                         break;
 367                 case INET_DIAG_BC_S_GE:
 368                         yes = entry->sport >= op[1].no;
 369                         break;
 370                 case INET_DIAG_BC_S_LE:
 371                         yes = entry->dport <= op[1].no;
 372                         break;
 373                 case INET_DIAG_BC_D_GE:
 374                         yes = entry->dport >= op[1].no;
 375                         break;
 376                 case INET_DIAG_BC_D_LE:
 377                         yes = entry->dport <= op[1].no;
 378                         break;
 379                 case INET_DIAG_BC_AUTO:
 380                         yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
 381                         break;
 382                 case INET_DIAG_BC_S_COND:
 383                 case INET_DIAG_BC_D_COND: {
 384                         struct inet_diag_hostcond *cond;
 385                         __be32 *addr;
 386
 387                         cond = (struct inet_diag_hostcond *)(op + 1);
 388                         if (cond->port != -1 &&
 389                             cond->port != (op->code == INET_DIAG_BC_S_COND ?
 390                                              entry->sport : entry->dport)) {
 391                                 yes = 0;
 392                                 break;
 393                         }
 394
 395                         if (cond->prefix_len == 0)
 396                                 break;
 397
 398                         if (op->code == INET_DIAG_BC_S_COND)
 399                                 addr = entry->saddr;
 400                         else
 401                                 addr = entry->daddr;
 402
 403                         if (bitstring_match(addr, cond->addr,
 404                                             cond->prefix_len))
 405                                 break;
 406                         if (entry->family == AF_INET6 &&
 407                             cond->family == AF_INET) {
 408                                 if (addr[0] == 0 && addr[1] == 0 &&
 409                                     addr[2] == htonl(0xffff) &&
 410                                     bitstring_match(addr + 3, cond->addr,
 411                                                     cond->prefix_len))
 412                                         break;
 413                         }
 414                         yes = 0;
 415                         break;
 416                 }
 417                 }
 418
 419                 if (yes) {
 420                         len -= op->yes;
 421                         bc += op->yes;
 422                 } else {
 423                         len -= op->no;
 424                         bc += op->no;
 425                 }
 426         }
 427         return (len == 0);
 428 }
 429
 430 static int valid_cc(const void *bc, int len, int cc)
 431 {
 432         while (len >= 0) {
 433                 const struct inet_diag_bc_op *op = bc;
 434
 435                 if (cc > len)
 436                         return 0;
 437                 if (cc == len)
 438                         return 1;
 439                 if (op->yes < 4)
 440                         return 0;
 441                 len -= op->yes;
 442                 bc  += op->yes;
 443         }
 444         return 0;
 445 }
 446
 447 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
 448 {
 449         const unsigned char *bc = bytecode;
 450         int  len = bytecode_len;
 451
 452         while (len > 0) {
 453                 struct inet_diag_bc_op *op = (struct inet_diag_bc_op *)bc;
 454
 455 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
 456                 switch (op->code) {
 457                 case INET_DIAG_BC_AUTO:
 458                 case INET_DIAG_BC_S_COND:
 459                 case INET_DIAG_BC_D_COND:
 460                 case INET_DIAG_BC_S_GE:
 461                 case INET_DIAG_BC_S_LE:
 462                 case INET_DIAG_BC_D_GE:
 463                 case INET_DIAG_BC_D_LE:
 464                         if (op->yes < 4 || op->yes > len + 4)
 465                                 return -EINVAL;
 466                 case INET_DIAG_BC_JMP:
 467                         if (op->no < 4 || op->no > len + 4)
 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                         if (op->yes < 4 || op->yes > len + 4)
 475                                 return -EINVAL;
 476                         break;
 477                 default:
 478                         return -EINVAL;
 479                 }
 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 (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
 493                 struct inet_diag_entry entry;
 494                 struct rtattr *bc = (struct rtattr *)(r + 1);
 495                 struct inet_sock *inet = inet_sk(sk);
 496
 497                 entry.family = sk->sk_family;
 498 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 499                 if (entry.family == AF_INET6) {
 500                         struct ipv6_pinfo *np = inet6_sk(sk);
 501
 502                         entry.saddr = np->rcv_saddr.s6_addr32;
 503                         entry.daddr = np->daddr.s6_addr32;
 504                 } else
 505 #endif
 506                 {
 507                         entry.saddr = &inet->rcv_saddr;
 508                         entry.daddr = &inet->daddr;
 509                 }
 510                 entry.sport = inet->num;
 511                 entry.dport = ntohs(inet->dport);
 512                 entry.userlocks = sk->sk_userlocks;
 513
 514                 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
 515                         return 0;
 516         }
 517
 518         return inet_csk_diag_fill(sk, skb, r->idiag_ext,
 519                                   NETLINK_CB(cb->skb).pid,
 520                                   cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
 521 }
 522
 523 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
 524                                struct sk_buff *skb,
 525                                struct netlink_callback *cb)
 526 {
 527         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
 528
 529         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
 530                 struct inet_diag_entry entry;
 531                 struct rtattr *bc = (struct rtattr *)(r + 1);
 532
 533                 entry.family = tw->tw_family;
 534 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 535                 if (tw->tw_family == AF_INET6) {
 536                         struct inet6_timewait_sock *tw6 =
 537                                                 inet6_twsk((struct sock *)tw);
 538                         entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
 539                         entry.daddr = tw6->tw_v6_daddr.s6_addr32;
 540                 } else
 541 #endif
 542                 {
 543                         entry.saddr = &tw->tw_rcv_saddr;
 544                         entry.daddr = &tw->tw_daddr;
 545                 }
 546                 entry.sport = tw->tw_num;
 547                 entry.dport = ntohs(tw->tw_dport);
 548                 entry.userlocks = 0;
 549
 550                 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
 551                         return 0;
 552         }
 553
 554         return inet_twsk_diag_fill(tw, skb, r->idiag_ext,
 555                                    NETLINK_CB(cb->skb).pid,
 556                                    cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
 557 }
 558
 559 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
 560                               struct request_sock *req, u32 pid, u32 seq,
 561                               const struct nlmsghdr *unlh)
 562 {
 563         const struct inet_request_sock *ireq = inet_rsk(req);
 564         struct inet_sock *inet = inet_sk(sk);
 565         unsigned char *b = skb_tail_pointer(skb);
 566         struct inet_diag_msg *r;
 567         struct nlmsghdr *nlh;
 568         long tmo;
 569
 570         nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
 571         nlh->nlmsg_flags = NLM_F_MULTI;
 572         r = NLMSG_DATA(nlh);
 573
 574         r->idiag_family = sk->sk_family;
 575         r->idiag_state = TCP_SYN_RECV;
 576         r->idiag_timer = 1;
 577         r->idiag_retrans = req->retrans;
 578
 579         r->id.idiag_if = sk->sk_bound_dev_if;
 580         r->id.idiag_cookie[0] = (u32)(unsigned long)req;
 581         r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
 582
 583         tmo = req->expires - jiffies;
 584         if (tmo < 0)
 585                 tmo = 0;
 586
 587         r->id.idiag_sport = inet->sport;
 588         r->id.idiag_dport = ireq->rmt_port;
 589         r->id.idiag_src[0] = ireq->loc_addr;
 590         r->id.idiag_dst[0] = ireq->rmt_addr;
 591         r->idiag_expires = jiffies_to_msecs(tmo);
 592         r->idiag_rqueue = 0;
 593         r->idiag_wqueue = 0;
 594         r->idiag_uid = sock_i_uid(sk);
 595         r->idiag_inode = 0;
 596 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 597         if (r->idiag_family == AF_INET6) {
 598                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
 599                                &inet6_rsk(req)->loc_addr);
 600                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
 601                                &inet6_rsk(req)->rmt_addr);
 602         }
 603 #endif
 604         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
 605
 606         return skb->len;
 607
 608 nlmsg_failure:
 609         nlmsg_trim(skb, b);
 610         return -1;
 611 }
 612
 613 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
 614                                struct netlink_callback *cb)
 615 {
 616         struct inet_diag_entry entry;
 617         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
 618         struct inet_connection_sock *icsk = inet_csk(sk);
 619         struct listen_sock *lopt;
 620         struct rtattr *bc = NULL;
 621         struct inet_sock *inet = inet_sk(sk);
 622         int j, s_j;
 623         int reqnum, s_reqnum;
 624         int err = 0;
 625
 626         s_j = cb->args[3];
 627         s_reqnum = cb->args[4];
 628
 629         if (s_j > 0)
 630                 s_j--;
 631
 632         entry.family = sk->sk_family;
 633
 634         read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 635
 636         lopt = icsk->icsk_accept_queue.listen_opt;
 637         if (!lopt || !lopt->qlen)
 638                 goto out;
 639
 640         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
 641                 bc = (struct rtattr *)(r + 1);
 642                 entry.sport = inet->num;
 643                 entry.userlocks = sk->sk_userlocks;
 644         }
 645
 646         for (j = s_j; j < lopt->nr_table_entries; j++) {
 647                 struct request_sock *req, *head = lopt->syn_table[j];
 648
 649                 reqnum = 0;
 650                 for (req = head; req; reqnum++, req = req->dl_next) {
 651                         struct inet_request_sock *ireq = inet_rsk(req);
 652
 653                         if (reqnum < s_reqnum)
 654                                 continue;
 655                         if (r->id.idiag_dport != ireq->rmt_port &&
 656                             r->id.idiag_dport)
 657                                 continue;
 658
 659                         if (bc) {
 660                                 entry.saddr =
 661 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 662                                         (entry.family == AF_INET6) ?
 663                                         inet6_rsk(req)->loc_addr.s6_addr32 :
 664 #endif
 665                                         &ireq->loc_addr;
 666                                 entry.daddr =
 667 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 668                                         (entry.family == AF_INET6) ?
 669                                         inet6_rsk(req)->rmt_addr.s6_addr32 :
 670 #endif
 671                                         &ireq->rmt_addr;
 672                                 entry.dport = ntohs(ireq->rmt_port);
 673
 674                                 if (!inet_diag_bc_run(RTA_DATA(bc),
 675                                                     RTA_PAYLOAD(bc), &entry))
 676                                         continue;
 677                         }
 678
 679                         err = inet_diag_fill_req(skb, sk, req,
 680                                                NETLINK_CB(cb->skb).pid,
 681                                                cb->nlh->nlmsg_seq, cb->nlh);
 682                         if (err < 0) {
 683                                 cb->args[3] = j + 1;
 684                                 cb->args[4] = reqnum;
 685                                 goto out;
 686                         }
 687                 }
 688
 689                 s_reqnum = 0;
 690         }
 691
 692 out:
 693         read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 694
 695         return err;
 696 }
 697
 698 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
 699 {
 700         int i, num;
 701         int s_i, s_num;
 702         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
 703         const struct inet_diag_handler *handler;
 704         struct inet_hashinfo *hashinfo;
 705
 706         handler = inet_diag_lock_handler(cb->nlh->nlmsg_type);
 707         if (IS_ERR(handler))
 708                 goto unlock;
 709
 710         hashinfo = handler->idiag_hashinfo;
 711
 712         s_i = cb->args[1];
 713         s_num = num = cb->args[2];
 714
 715         if (cb->args[0] == 0) {
 716                 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
 717                         goto skip_listen_ht;
 718
 719                 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
 720                         struct sock *sk;
 721                         struct hlist_nulls_node *node;
 722                         struct inet_listen_hashbucket *ilb;
 723
 724                         num = 0;
 725                         ilb = &hashinfo->listening_hash[i];
 726                         spin_lock_bh(&ilb->lock);
 727                         sk_nulls_for_each(sk, node, &ilb->head) {
 728                                 struct inet_sock *inet = inet_sk(sk);
 729
 730                                 if (num < s_num) {
 731                                         num++;
 732                                         continue;
 733                                 }
 734
 735                                 if (r->id.idiag_sport != inet->sport &&
 736                                     r->id.idiag_sport)
 737                                         goto next_listen;
 738
 739                                 if (!(r->idiag_states & TCPF_LISTEN) ||
 740                                     r->id.idiag_dport ||
 741                                     cb->args[3] > 0)
 742                                         goto syn_recv;
 743
 744                                 if (inet_csk_diag_dump(sk, skb, cb) < 0) {
 745                                         spin_unlock_bh(&ilb->lock);
 746                                         goto done;
 747                                 }
 748
 749 syn_recv:
 750                                 if (!(r->idiag_states & TCPF_SYN_RECV))
 751                                         goto next_listen;
 752
 753                                 if (inet_diag_dump_reqs(skb, sk, cb) < 0) {
 754                                         spin_unlock_bh(&ilb->lock);
 755                                         goto done;
 756                                 }
 757
 758 next_listen:
 759                                 cb->args[3] = 0;
 760                                 cb->args[4] = 0;
 761                                 ++num;
 762                         }
 763                         spin_unlock_bh(&ilb->lock);
 764
 765                         s_num = 0;
 766                         cb->args[3] = 0;
 767                         cb->args[4] = 0;
 768                 }
 769 skip_listen_ht:
 770                 cb->args[0] = 1;
 771                 s_i = num = s_num = 0;
 772         }
 773
 774         if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
 775                 goto unlock;
 776
 777         for (i = s_i; i < hashinfo->ehash_size; i++) {
 778                 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
 779                 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
 780                 struct sock *sk;
 781                 struct hlist_nulls_node *node;
 782
 783                 num = 0;
 784
 785                 if (hlist_nulls_empty(&head->chain) &&
 786                         hlist_nulls_empty(&head->twchain))
 787                         continue;
 788
 789                 if (i > s_i)
 790                         s_num = 0;
 791
 792                 spin_lock_bh(lock);
 793                 sk_nulls_for_each(sk, node, &head->chain) {
 794                         struct inet_sock *inet = inet_sk(sk);
 795
 796                         if (num < s_num)
 797                                 goto next_normal;
 798                         if (!(r->idiag_states & (1 << sk->sk_state)))
 799                                 goto next_normal;
 800                         if (r->id.idiag_sport != inet->sport &&
 801                             r->id.idiag_sport)
 802                                 goto next_normal;
 803                         if (r->id.idiag_dport != inet->dport &&
 804                             r->id.idiag_dport)
 805                                 goto next_normal;
 806                         if (inet_csk_diag_dump(sk, skb, cb) < 0) {
 807                                 spin_unlock_bh(lock);
 808                                 goto done;
 809                         }
 810 next_normal:
 811                         ++num;
 812                 }
 813
 814                 if (r->idiag_states & TCPF_TIME_WAIT) {
 815                         struct inet_timewait_sock *tw;
 816
 817                         inet_twsk_for_each(tw, node,
 818                                     &head->twchain) {
 819
 820                                 if (num < s_num)
 821                                         goto next_dying;
 822                                 if (r->id.idiag_sport != tw->tw_sport &&
 823                                     r->id.idiag_sport)
 824                                         goto next_dying;
 825                                 if (r->id.idiag_dport != tw->tw_dport &&
 826                                     r->id.idiag_dport)
 827                                         goto next_dying;
 828                                 if (inet_twsk_diag_dump(tw, skb, cb) < 0) {
 829                                         spin_unlock_bh(lock);
 830                                         goto done;
 831                                 }
 832 next_dying:
 833                                 ++num;
 834                         }
 835                 }
 836                 spin_unlock_bh(lock);
 837         }
 838
 839 done:
 840         cb->args[1] = i;
 841         cb->args[2] = num;
 842 unlock:
 843         inet_diag_unlock_handler(handler);
 844         return skb->len;
 845 }
 846
 847 static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
 848 {
 849         int hdrlen = sizeof(struct inet_diag_req);
 850
 851         if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
 852             nlmsg_len(nlh) < hdrlen)
 853                 return -EINVAL;
 854
 855         if (nlh->nlmsg_flags & NLM_F_DUMP) {
 856                 if (nlmsg_attrlen(nlh, hdrlen)) {
 857                         struct nlattr *attr;
 858
 859                         attr = nlmsg_find_attr(nlh, hdrlen,
 860                                                INET_DIAG_REQ_BYTECODE);
 861                         if (attr == NULL ||
 862                             nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
 863                             inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
 864                                 return -EINVAL;
 865                 }
 866
 867                 return netlink_dump_start(idiagnl, skb, nlh,
 868                                           inet_diag_dump, NULL);
 869         }
 870
 871         return inet_diag_get_exact(skb, nlh);
 872 }
 873
 874 static DEFINE_MUTEX(inet_diag_mutex);
 875
 876 static void inet_diag_rcv(struct sk_buff *skb)
 877 {
 878         mutex_lock(&inet_diag_mutex);
 879         netlink_rcv_skb(skb, &inet_diag_rcv_msg);
 880         mutex_unlock(&inet_diag_mutex);
 881 }
 882
 883 int inet_diag_register(const struct inet_diag_handler *h)
 884 {
 885         const __u16 type = h->idiag_type;
 886         int err = -EINVAL;
 887
 888         if (type >= INET_DIAG_GETSOCK_MAX)
 889                 goto out;
 890
 891         mutex_lock(&inet_diag_table_mutex);
 892         err = -EEXIST;
 893         if (inet_diag_table[type] == NULL) {
 894                 inet_diag_table[type] = h;
 895                 err = 0;
 896         }
 897         mutex_unlock(&inet_diag_table_mutex);
 898 out:
 899         return err;
 900 }
 901 EXPORT_SYMBOL_GPL(inet_diag_register);
 902
 903 void inet_diag_unregister(const struct inet_diag_handler *h)
 904 {
 905         const __u16 type = h->idiag_type;
 906
 907         if (type >= INET_DIAG_GETSOCK_MAX)
 908                 return;
 909
 910         mutex_lock(&inet_diag_table_mutex);
 911         inet_diag_table[type] = NULL;
 912         mutex_unlock(&inet_diag_table_mutex);
 913 }
 914 EXPORT_SYMBOL_GPL(inet_diag_unregister);
 915
 916 static int __init inet_diag_init(void)
 917 {
 918         const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX *
 919                                           sizeof(struct inet_diag_handler *));
 920         int err = -ENOMEM;
 921
 922         inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
 923         if (!inet_diag_table)
 924                 goto out;
 925
 926         idiagnl = netlink_kernel_create(&init_net, NETLINK_INET_DIAG, 0,
 927                                         inet_diag_rcv, NULL, THIS_MODULE);
 928         if (idiagnl == NULL)
 929                 goto out_free_table;
 930         err = 0;
 931 out:
 932         return err;
 933 out_free_table:
 934         kfree(inet_diag_table);
 935         goto out;
 936 }
 937
 938 static void __exit inet_diag_exit(void)
 939 {
 940         netlink_kernel_release(idiagnl);
 941         kfree(inet_diag_table);
 942 }
 943
 944 module_init(inet_diag_init);
 945 module_exit(inet_diag_exit);
 946 MODULE_LICENSE("GPL");
 947 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_INET_DIAG);