net/ipv4/inet_diag.c

   1 /*
   2  * inet_diag.c  Module for monitoring INET transport protocols sockets.
   3  *
   4  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
   5  *
   6  *      This program is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU General Public License
   8  *      as published by the Free Software Foundation; either version
   9  *      2 of the License, or (at your option) any later version.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/types.h>
  15 #include <linux/fcntl.h>
  16 #include <linux/random.h>
  17 #include <linux/slab.h>
  18 #include <linux/cache.h>
  19 #include <linux/init.h>
  20 #include <linux/time.h>
  21
  22 #include <net/icmp.h>
  23 #include <net/tcp.h>
  24 #include <net/ipv6.h>
  25 #include <net/inet_common.h>
  26 #include <net/inet_connection_sock.h>
  27 #include <net/inet_hashtables.h>
  28 #include <net/inet_timewait_sock.h>
  29 #include <net/inet6_hashtables.h>
  30 #include <net/netlink.h>
  31
  32 #include <linux/inet.h>
  33 #include <linux/stddef.h>
  34
  35 #include <linux/inet_diag.h>
  36 #include <linux/sock_diag.h>
  37
  38 static const struct inet_diag_handler **inet_diag_table;
  39
  40 struct inet_diag_entry {
  41         const __be32 *saddr;
  42         const __be32 *daddr;
  43         u16 sport;
  44         u16 dport;
  45         u16 family;
  46         u16 userlocks;
  47         u32 ifindex;
  48         u32 mark;
  49 };
  50
  51 static DEFINE_MUTEX(inet_diag_table_mutex);
  52
  53 static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
  54 {
  55         if (!inet_diag_table[proto])
  56                 sock_load_diag_module(AF_INET, proto);
  57
  58         mutex_lock(&inet_diag_table_mutex);
  59         if (!inet_diag_table[proto])
  60                 return ERR_PTR(-ENOENT);
  61
  62         return inet_diag_table[proto];
  63 }
  64
  65 static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
  66 {
  67         mutex_unlock(&inet_diag_table_mutex);
  68 }
  69
  70 void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk)
  71 {
  72         r->idiag_family = sk->sk_family;
  73
  74         r->id.idiag_sport = htons(sk->sk_num);
  75         r->id.idiag_dport = sk->sk_dport;
  76         r->id.idiag_if = sk->sk_bound_dev_if;
  77         sock_diag_save_cookie(sk, r->id.idiag_cookie);
  78
  79 #if IS_ENABLED(CONFIG_IPV6)
  80         if (sk->sk_family == AF_INET6) {
  81                 *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
  82                 *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
  83         } else
  84 #endif
  85         {
  86         memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
  87         memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
  88
  89         r->id.idiag_src[0] = sk->sk_rcv_saddr;
  90         r->id.idiag_dst[0] = sk->sk_daddr;
  91         }
  92 }
  93 EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill);
  94
  95 static size_t inet_sk_attr_size(struct sock *sk,
  96                                 const struct inet_diag_req_v2 *req,
  97                                 bool net_admin)
  98 {
  99         const struct inet_diag_handler *handler;
 100         size_t aux = 0;
 101
 102         handler = inet_diag_table[req->sdiag_protocol];
 103         if (handler && handler->idiag_get_aux_size)
 104                 aux = handler->idiag_get_aux_size(sk, net_admin);
 105
 106         return    nla_total_size(sizeof(struct tcp_info))
 107                 + nla_total_size(1) /* INET_DIAG_SHUTDOWN */
 108                 + nla_total_size(1) /* INET_DIAG_TOS */
 109                 + nla_total_size(1) /* INET_DIAG_TCLASS */
 110                 + nla_total_size(4) /* INET_DIAG_MARK */
 111                 + nla_total_size(sizeof(struct inet_diag_meminfo))
 112                 + nla_total_size(sizeof(struct inet_diag_msg))
 113                 + nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
 114                 + nla_total_size(TCP_CA_NAME_MAX)
 115                 + nla_total_size(sizeof(struct tcpvegas_info))
 116                 + aux
 117                 + 64;
 118 }
 119
 120 int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
 121                              struct inet_diag_msg *r, int ext,
 122                              struct user_namespace *user_ns,
 123                              bool net_admin)
 124 {
 125         const struct inet_sock *inet = inet_sk(sk);
 126
 127         if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
 128                 goto errout;
 129
 130         /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
 131          * hence this needs to be included regardless of socket family.
 132          */
 133         if (ext & (1 << (INET_DIAG_TOS - 1)))
 134                 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
 135                         goto errout;
 136
 137 #if IS_ENABLED(CONFIG_IPV6)
 138         if (r->idiag_family == AF_INET6) {
 139                 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
 140                         if (nla_put_u8(skb, INET_DIAG_TCLASS,
 141                                        inet6_sk(sk)->tclass) < 0)
 142                                 goto errout;
 143
 144                 if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
 145                     nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
 146                         goto errout;
 147         }
 148 #endif
 149
 150         if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, sk->sk_mark))
 151                 goto errout;
 152
 153         r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
 154         r->idiag_inode = sock_i_ino(sk);
 155
 156         return 0;
 157 errout:
 158         return 1;
 159 }
 160 EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill);
 161
 162 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
 163                       struct sk_buff *skb, const struct inet_diag_req_v2 *req,
 164                       struct user_namespace *user_ns,
 165                       u32 portid, u32 seq, u16 nlmsg_flags,
 166                       const struct nlmsghdr *unlh,
 167                       bool net_admin)
 168 {
 169         const struct tcp_congestion_ops *ca_ops;
 170         const struct inet_diag_handler *handler;
 171         int ext = req->idiag_ext;
 172         struct inet_diag_msg *r;
 173         struct nlmsghdr  *nlh;
 174         struct nlattr *attr;
 175         void *info = NULL;
 176
 177         handler = inet_diag_table[req->sdiag_protocol];
 178         BUG_ON(!handler);
 179
 180         nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
 181                         nlmsg_flags);
 182         if (!nlh)
 183                 return -EMSGSIZE;
 184
 185         r = nlmsg_data(nlh);
 186         BUG_ON(!sk_fullsock(sk));
 187
 188         inet_diag_msg_common_fill(r, sk);
 189         r->idiag_state = sk->sk_state;
 190         r->idiag_timer = 0;
 191         r->idiag_retrans = 0;
 192
 193         if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns, net_admin))
 194                 goto errout;
 195
 196         if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
 197                 struct inet_diag_meminfo minfo = {
 198                         .idiag_rmem = sk_rmem_alloc_get(sk),
 199                         .idiag_wmem = sk->sk_wmem_queued,
 200                         .idiag_fmem = sk->sk_forward_alloc,
 201                         .idiag_tmem = sk_wmem_alloc_get(sk),
 202                 };
 203
 204                 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
 205                         goto errout;
 206         }
 207
 208         if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
 209                 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
 210                         goto errout;
 211
 212         /*
 213          * RAW sockets might have user-defined protocols assigned,
 214          * so report the one supplied on socket creation.
 215          */
 216         if (sk->sk_type == SOCK_RAW) {
 217                 if (nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))
 218                         goto errout;
 219         }
 220
 221         if (!icsk) {
 222                 handler->idiag_get_info(sk, r, NULL);
 223                 goto out;
 224         }
 225
 226         if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
 227             icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT ||
 228             icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
 229                 r->idiag_timer = 1;
 230                 r->idiag_retrans = icsk->icsk_retransmits;
 231                 r->idiag_expires =
 232                         jiffies_to_msecs(icsk->icsk_timeout - jiffies);
 233         } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
 234                 r->idiag_timer = 4;
 235                 r->idiag_retrans = icsk->icsk_probes_out;
 236                 r->idiag_expires =
 237                         jiffies_to_msecs(icsk->icsk_timeout - jiffies);
 238         } else if (timer_pending(&sk->sk_timer)) {
 239                 r->idiag_timer = 2;
 240                 r->idiag_retrans = icsk->icsk_probes_out;
 241                 r->idiag_expires =
 242                         jiffies_to_msecs(sk->sk_timer.expires - jiffies);
 243         } else {
 244                 r->idiag_timer = 0;
 245                 r->idiag_expires = 0;
 246         }
 247
 248         if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
 249                 attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
 250                                          handler->idiag_info_size,
 251                                          INET_DIAG_PAD);
 252                 if (!attr)
 253                         goto errout;
 254
 255                 info = nla_data(attr);
 256         }
 257
 258         if (ext & (1 << (INET_DIAG_CONG - 1))) {
 259                 int err = 0;
 260
 261                 rcu_read_lock();
 262                 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
 263                 if (ca_ops)
 264                         err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
 265                 rcu_read_unlock();
 266                 if (err < 0)
 267                         goto errout;
 268         }
 269
 270         handler->idiag_get_info(sk, r, info);
 271
 272         if (ext & (1 << (INET_DIAG_INFO - 1)) && handler->idiag_get_aux)
 273                 if (handler->idiag_get_aux(sk, net_admin, skb) < 0)
 274                         goto errout;
 275
 276         if (sk->sk_state < TCP_TIME_WAIT) {
 277                 union tcp_cc_info info;
 278                 size_t sz = 0;
 279                 int attr;
 280
 281                 rcu_read_lock();
 282                 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
 283                 if (ca_ops && ca_ops->get_info)
 284                         sz = ca_ops->get_info(sk, ext, &attr, &info);
 285                 rcu_read_unlock();
 286                 if (sz && nla_put(skb, attr, sz, &info) < 0)
 287                         goto errout;
 288         }
 289
 290         if (ext & (1 << (INET_DIAG_CLASS_ID - 1))) {
 291                 u32 classid = 0;
 292
 293 #ifdef CONFIG_SOCK_CGROUP_DATA
 294                 classid = sock_cgroup_classid(&sk->sk_cgrp_data);
 295 #endif
 296
 297                 if (nla_put_u32(skb, INET_DIAG_CLASS_ID, classid))
 298                         goto errout;
 299         }
 300
 301 out:
 302         nlmsg_end(skb, nlh);
 303         return 0;
 304
 305 errout:
 306         nlmsg_cancel(skb, nlh);
 307         return -EMSGSIZE;
 308 }
 309 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
 310
 311 static int inet_csk_diag_fill(struct sock *sk,
 312                               struct sk_buff *skb,
 313                               const struct inet_diag_req_v2 *req,
 314                               struct user_namespace *user_ns,
 315                               u32 portid, u32 seq, u16 nlmsg_flags,
 316                               const struct nlmsghdr *unlh,
 317                               bool net_admin)
 318 {
 319         return inet_sk_diag_fill(sk, inet_csk(sk), skb, req, user_ns,
 320                                  portid, seq, nlmsg_flags, unlh, net_admin);
 321 }
 322
 323 static int inet_twsk_diag_fill(struct sock *sk,
 324                                struct sk_buff *skb,
 325                                u32 portid, u32 seq, u16 nlmsg_flags,
 326                                const struct nlmsghdr *unlh)
 327 {
 328         struct inet_timewait_sock *tw = inet_twsk(sk);
 329         struct inet_diag_msg *r;
 330         struct nlmsghdr *nlh;
 331         long tmo;
 332
 333         nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
 334                         nlmsg_flags);
 335         if (!nlh)
 336                 return -EMSGSIZE;
 337
 338         r = nlmsg_data(nlh);
 339         BUG_ON(tw->tw_state != TCP_TIME_WAIT);
 340
 341         tmo = tw->tw_timer.expires - jiffies;
 342         if (tmo < 0)
 343                 tmo = 0;
 344
 345         inet_diag_msg_common_fill(r, sk);
 346         r->idiag_retrans      = 0;
 347
 348         r->idiag_state        = tw->tw_substate;
 349         r->idiag_timer        = 3;
 350         r->idiag_expires      = jiffies_to_msecs(tmo);
 351         r->idiag_rqueue       = 0;
 352         r->idiag_wqueue       = 0;
 353         r->idiag_uid          = 0;
 354         r->idiag_inode        = 0;
 355
 356         nlmsg_end(skb, nlh);
 357         return 0;
 358 }
 359
 360 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
 361                               u32 portid, u32 seq, u16 nlmsg_flags,
 362                               const struct nlmsghdr *unlh, bool net_admin)
 363 {
 364         struct request_sock *reqsk = inet_reqsk(sk);
 365         struct inet_diag_msg *r;
 366         struct nlmsghdr *nlh;
 367         long tmo;
 368
 369         nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
 370                         nlmsg_flags);
 371         if (!nlh)
 372                 return -EMSGSIZE;
 373
 374         r = nlmsg_data(nlh);
 375         inet_diag_msg_common_fill(r, sk);
 376         r->idiag_state = TCP_SYN_RECV;
 377         r->idiag_timer = 1;
 378         r->idiag_retrans = reqsk->num_retrans;
 379
 380         BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
 381                      offsetof(struct sock, sk_cookie));
 382
 383         tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
 384         r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0;
 385         r->idiag_rqueue = 0;
 386         r->idiag_wqueue = 0;
 387         r->idiag_uid    = 0;
 388         r->idiag_inode  = 0;
 389
 390         if (net_admin && nla_put_u32(skb, INET_DIAG_MARK,
 391                                      inet_rsk(reqsk)->ir_mark))
 392                 return -EMSGSIZE;
 393
 394         nlmsg_end(skb, nlh);
 395         return 0;
 396 }
 397
 398 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
 399                         const struct inet_diag_req_v2 *r,
 400                         struct user_namespace *user_ns,
 401                         u32 portid, u32 seq, u16 nlmsg_flags,
 402                         const struct nlmsghdr *unlh, bool net_admin)
 403 {
 404         if (sk->sk_state == TCP_TIME_WAIT)
 405                 return inet_twsk_diag_fill(sk, skb, portid, seq,
 406                                            nlmsg_flags, unlh);
 407
 408         if (sk->sk_state == TCP_NEW_SYN_RECV)
 409                 return inet_req_diag_fill(sk, skb, portid, seq,
 410                                           nlmsg_flags, unlh, net_admin);
 411
 412         return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
 413                                   nlmsg_flags, unlh, net_admin);
 414 }
 415
 416 struct sock *inet_diag_find_one_icsk(struct net *net,
 417                                      struct inet_hashinfo *hashinfo,
 418                                      const struct inet_diag_req_v2 *req)
 419 {
 420         struct sock *sk;
 421
 422         rcu_read_lock();
 423         if (req->sdiag_family == AF_INET)
 424                 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
 425                                  req->id.idiag_dport, req->id.idiag_src[0],
 426                                  req->id.idiag_sport, req->id.idiag_if);
 427 #if IS_ENABLED(CONFIG_IPV6)
 428         else if (req->sdiag_family == AF_INET6) {
 429                 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
 430                     ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
 431                         sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
 432                                          req->id.idiag_dport, req->id.idiag_src[3],
 433                                          req->id.idiag_sport, req->id.idiag_if);
 434                 else
 435                         sk = inet6_lookup(net, hashinfo, NULL, 0,
 436                                           (struct in6_addr *)req->id.idiag_dst,
 437                                           req->id.idiag_dport,
 438                                           (struct in6_addr *)req->id.idiag_src,
 439                                           req->id.idiag_sport,
 440                                           req->id.idiag_if);
 441         }
 442 #endif
 443         else {
 444                 rcu_read_unlock();
 445                 return ERR_PTR(-EINVAL);
 446         }
 447         rcu_read_unlock();
 448         if (!sk)
 449                 return ERR_PTR(-ENOENT);
 450
 451         if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
 452                 sock_gen_put(sk);
 453                 return ERR_PTR(-ENOENT);
 454         }
 455
 456         return sk;
 457 }
 458 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
 459
 460 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
 461                             struct sk_buff *in_skb,
 462                             const struct nlmsghdr *nlh,
 463                             const struct inet_diag_req_v2 *req)
 464 {
 465         bool net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN);
 466         struct net *net = sock_net(in_skb->sk);
 467         struct sk_buff *rep;
 468         struct sock *sk;
 469         int err;
 470
 471         sk = inet_diag_find_one_icsk(net, hashinfo, req);
 472         if (IS_ERR(sk))
 473                 return PTR_ERR(sk);
 474
 475         rep = nlmsg_new(inet_sk_attr_size(sk, req, net_admin), GFP_KERNEL);
 476         if (!rep) {
 477                 err = -ENOMEM;
 478                 goto out;
 479         }
 480
 481         err = sk_diag_fill(sk, rep, req,
 482                            sk_user_ns(NETLINK_CB(in_skb).sk),
 483                            NETLINK_CB(in_skb).portid,
 484                            nlh->nlmsg_seq, 0, nlh, net_admin);
 485         if (err < 0) {
 486                 WARN_ON(err == -EMSGSIZE);
 487                 nlmsg_free(rep);
 488                 goto out;
 489         }
 490         err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
 491                               MSG_DONTWAIT);
 492         if (err > 0)
 493                 err = 0;
 494
 495 out:
 496         if (sk)
 497                 sock_gen_put(sk);
 498
 499         return err;
 500 }
 501 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
 502
 503 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
 504                                const struct nlmsghdr *nlh,
 505                                const struct inet_diag_req_v2 *req)
 506 {
 507         const struct inet_diag_handler *handler;
 508         int err;
 509
 510         handler = inet_diag_lock_handler(req->sdiag_protocol);
 511         if (IS_ERR(handler))
 512                 err = PTR_ERR(handler);
 513         else if (cmd == SOCK_DIAG_BY_FAMILY)
 514                 err = handler->dump_one(in_skb, nlh, req);
 515         else if (cmd == SOCK_DESTROY && handler->destroy)
 516                 err = handler->destroy(in_skb, req);
 517         else
 518                 err = -EOPNOTSUPP;
 519         inet_diag_unlock_handler(handler);
 520
 521         return err;
 522 }
 523
 524 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
 525 {
 526         int words = bits >> 5;
 527
 528         bits &= 0x1f;
 529
 530         if (words) {
 531                 if (memcmp(a1, a2, words << 2))
 532                         return 0;
 533         }
 534         if (bits) {
 535                 __be32 w1, w2;
 536                 __be32 mask;
 537
 538                 w1 = a1[words];
 539                 w2 = a2[words];
 540
 541                 mask = htonl((0xffffffff) << (32 - bits));
 542
 543                 if ((w1 ^ w2) & mask)
 544                         return 0;
 545         }
 546
 547         return 1;
 548 }
 549
 550 static int inet_diag_bc_run(const struct nlattr *_bc,
 551                             const struct inet_diag_entry *entry)
 552 {
 553         const void *bc = nla_data(_bc);
 554         int len = nla_len(_bc);
 555
 556         while (len > 0) {
 557                 int yes = 1;
 558                 const struct inet_diag_bc_op *op = bc;
 559
 560                 switch (op->code) {
 561                 case INET_DIAG_BC_NOP:
 562                         break;
 563                 case INET_DIAG_BC_JMP:
 564                         yes = 0;
 565                         break;
 566                 case INET_DIAG_BC_S_EQ:
 567                         yes = entry->sport == op[1].no;
 568                         break;
 569                 case INET_DIAG_BC_S_GE:
 570                         yes = entry->sport >= op[1].no;
 571                         break;
 572                 case INET_DIAG_BC_S_LE:
 573                         yes = entry->sport <= op[1].no;
 574                         break;
 575                 case INET_DIAG_BC_D_EQ:
 576                         yes = entry->dport == op[1].no;
 577                         break;
 578                 case INET_DIAG_BC_D_GE:
 579                         yes = entry->dport >= op[1].no;
 580                         break;
 581                 case INET_DIAG_BC_D_LE:
 582                         yes = entry->dport <= op[1].no;
 583                         break;
 584                 case INET_DIAG_BC_AUTO:
 585                         yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
 586                         break;
 587                 case INET_DIAG_BC_S_COND:
 588                 case INET_DIAG_BC_D_COND: {
 589                         const struct inet_diag_hostcond *cond;
 590                         const __be32 *addr;
 591
 592                         cond = (const struct inet_diag_hostcond *)(op + 1);
 593                         if (cond->port != -1 &&
 594                             cond->port != (op->code == INET_DIAG_BC_S_COND ?
 595                                              entry->sport : entry->dport)) {
 596                                 yes = 0;
 597                                 break;
 598                         }
 599
 600                         if (op->code == INET_DIAG_BC_S_COND)
 601                                 addr = entry->saddr;
 602                         else
 603                                 addr = entry->daddr;
 604
 605                         if (cond->family != AF_UNSPEC &&
 606                             cond->family != entry->family) {
 607                                 if (entry->family == AF_INET6 &&
 608                                     cond->family == AF_INET) {
 609                                         if (addr[0] == 0 && addr[1] == 0 &&
 610                                             addr[2] == htonl(0xffff) &&
 611                                             bitstring_match(addr + 3,
 612                                                             cond->addr,
 613                                                             cond->prefix_len))
 614                                                 break;
 615                                 }
 616                                 yes = 0;
 617                                 break;
 618                         }
 619
 620                         if (cond->prefix_len == 0)
 621                                 break;
 622                         if (bitstring_match(addr, cond->addr,
 623                                             cond->prefix_len))
 624                                 break;
 625                         yes = 0;
 626                         break;
 627                 }
 628                 case INET_DIAG_BC_DEV_COND: {
 629                         u32 ifindex;
 630
 631                         ifindex = *((const u32 *)(op + 1));
 632                         if (ifindex != entry->ifindex)
 633                                 yes = 0;
 634                         break;
 635                 }
 636                 case INET_DIAG_BC_MARK_COND: {
 637                         struct inet_diag_markcond *cond;
 638
 639                         cond = (struct inet_diag_markcond *)(op + 1);
 640                         if ((entry->mark & cond->mask) != cond->mark)
 641                                 yes = 0;
 642                         break;
 643                 }
 644                 }
 645
 646                 if (yes) {
 647                         len -= op->yes;
 648                         bc += op->yes;
 649                 } else {
 650                         len -= op->no;
 651                         bc += op->no;
 652                 }
 653         }
 654         return len == 0;
 655 }
 656
 657 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
 658  */
 659 static void entry_fill_addrs(struct inet_diag_entry *entry,
 660                              const struct sock *sk)
 661 {
 662 #if IS_ENABLED(CONFIG_IPV6)
 663         if (sk->sk_family == AF_INET6) {
 664                 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
 665                 entry->daddr = sk->sk_v6_daddr.s6_addr32;
 666         } else
 667 #endif
 668         {
 669                 entry->saddr = &sk->sk_rcv_saddr;
 670                 entry->daddr = &sk->sk_daddr;
 671         }
 672 }
 673
 674 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
 675 {
 676         struct inet_sock *inet = inet_sk(sk);
 677         struct inet_diag_entry entry;
 678
 679         if (!bc)
 680                 return 1;
 681
 682         entry.family = sk->sk_family;
 683         entry_fill_addrs(&entry, sk);
 684         entry.sport = inet->inet_num;
 685         entry.dport = ntohs(inet->inet_dport);
 686         entry.ifindex = sk->sk_bound_dev_if;
 687         entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
 688         if (sk_fullsock(sk))
 689                 entry.mark = sk->sk_mark;
 690         else if (sk->sk_state == TCP_NEW_SYN_RECV)
 691                 entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark;
 692         else
 693                 entry.mark = 0;
 694
 695         return inet_diag_bc_run(bc, &entry);
 696 }
 697 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
 698
 699 static int valid_cc(const void *bc, int len, int cc)
 700 {
 701         while (len >= 0) {
 702                 const struct inet_diag_bc_op *op = bc;
 703
 704                 if (cc > len)
 705                         return 0;
 706                 if (cc == len)
 707                         return 1;
 708                 if (op->yes < 4 || op->yes & 3)
 709                         return 0;
 710                 len -= op->yes;
 711                 bc  += op->yes;
 712         }
 713         return 0;
 714 }
 715
 716 /* data is u32 ifindex */
 717 static bool valid_devcond(const struct inet_diag_bc_op *op, int len,
 718                           int *min_len)
 719 {
 720         /* Check ifindex space. */
 721         *min_len += sizeof(u32);
 722         if (len < *min_len)
 723                 return false;
 724
 725         return true;
 726 }
 727 /* Validate an inet_diag_hostcond. */
 728 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
 729                            int *min_len)
 730 {
 731         struct inet_diag_hostcond *cond;
 732         int addr_len;
 733
 734         /* Check hostcond space. */
 735         *min_len += sizeof(struct inet_diag_hostcond);
 736         if (len < *min_len)
 737                 return false;
 738         cond = (struct inet_diag_hostcond *)(op + 1);
 739
 740         /* Check address family and address length. */
 741         switch (cond->family) {
 742         case AF_UNSPEC:
 743                 addr_len = 0;
 744                 break;
 745         case AF_INET:
 746                 addr_len = sizeof(struct in_addr);
 747                 break;
 748         case AF_INET6:
 749                 addr_len = sizeof(struct in6_addr);
 750                 break;
 751         default:
 752                 return false;
 753         }
 754         *min_len += addr_len;
 755         if (len < *min_len)
 756                 return false;
 757
 758         /* Check prefix length (in bits) vs address length (in bytes). */
 759         if (cond->prefix_len > 8 * addr_len)
 760                 return false;
 761
 762         return true;
 763 }
 764
 765 /* Validate a port comparison operator. */
 766 static bool valid_port_comparison(const struct inet_diag_bc_op *op,
 767                                   int len, int *min_len)
 768 {
 769         /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
 770         *min_len += sizeof(struct inet_diag_bc_op);
 771         if (len < *min_len)
 772                 return false;
 773         return true;
 774 }
 775
 776 static bool valid_markcond(const struct inet_diag_bc_op *op, int len,
 777                            int *min_len)
 778 {
 779         *min_len += sizeof(struct inet_diag_markcond);
 780         return len >= *min_len;
 781 }
 782
 783 static int inet_diag_bc_audit(const struct nlattr *attr,
 784                               const struct sk_buff *skb)
 785 {
 786         bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN);
 787         const void *bytecode, *bc;
 788         int bytecode_len, len;
 789
 790         if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op))
 791                 return -EINVAL;
 792
 793         bytecode = bc = nla_data(attr);
 794         len = bytecode_len = nla_len(attr);
 795
 796         while (len > 0) {
 797                 int min_len = sizeof(struct inet_diag_bc_op);
 798                 const struct inet_diag_bc_op *op = bc;
 799
 800                 switch (op->code) {
 801                 case INET_DIAG_BC_S_COND:
 802                 case INET_DIAG_BC_D_COND:
 803                         if (!valid_hostcond(bc, len, &min_len))
 804                                 return -EINVAL;
 805                         break;
 806                 case INET_DIAG_BC_DEV_COND:
 807                         if (!valid_devcond(bc, len, &min_len))
 808                                 return -EINVAL;
 809                         break;
 810                 case INET_DIAG_BC_S_EQ:
 811                 case INET_DIAG_BC_S_GE:
 812                 case INET_DIAG_BC_S_LE:
 813                 case INET_DIAG_BC_D_EQ:
 814                 case INET_DIAG_BC_D_GE:
 815                 case INET_DIAG_BC_D_LE:
 816                         if (!valid_port_comparison(bc, len, &min_len))
 817                                 return -EINVAL;
 818                         break;
 819                 case INET_DIAG_BC_MARK_COND:
 820                         if (!net_admin)
 821                                 return -EPERM;
 822                         if (!valid_markcond(bc, len, &min_len))
 823                                 return -EINVAL;
 824                         break;
 825                 case INET_DIAG_BC_AUTO:
 826                 case INET_DIAG_BC_JMP:
 827                 case INET_DIAG_BC_NOP:
 828                         break;
 829                 default:
 830                         return -EINVAL;
 831                 }
 832
 833                 if (op->code != INET_DIAG_BC_NOP) {
 834                         if (op->no < min_len || op->no > len + 4 || op->no & 3)
 835                                 return -EINVAL;
 836                         if (op->no < len &&
 837                             !valid_cc(bytecode, bytecode_len, len - op->no))
 838                                 return -EINVAL;
 839                 }
 840
 841                 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
 842                         return -EINVAL;
 843                 bc  += op->yes;
 844                 len -= op->yes;
 845         }
 846         return len == 0 ? 0 : -EINVAL;
 847 }
 848
 849 static int inet_csk_diag_dump(struct sock *sk,
 850                               struct sk_buff *skb,
 851                               struct netlink_callback *cb,
 852                               const struct inet_diag_req_v2 *r,
 853                               const struct nlattr *bc,
 854                               bool net_admin)
 855 {
 856         if (!inet_diag_bc_sk(bc, sk))
 857                 return 0;
 858
 859         return inet_csk_diag_fill(sk, skb, r,
 860                                   sk_user_ns(NETLINK_CB(cb->skb).sk),
 861                                   NETLINK_CB(cb->skb).portid,
 862                                   cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh,
 863                                   net_admin);
 864 }
 865
 866 static void twsk_build_assert(void)
 867 {
 868         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
 869                      offsetof(struct sock, sk_family));
 870
 871         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
 872                      offsetof(struct inet_sock, inet_num));
 873
 874         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
 875                      offsetof(struct inet_sock, inet_dport));
 876
 877         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
 878                      offsetof(struct inet_sock, inet_rcv_saddr));
 879
 880         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
 881                      offsetof(struct inet_sock, inet_daddr));
 882
 883 #if IS_ENABLED(CONFIG_IPV6)
 884         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
 885                      offsetof(struct sock, sk_v6_rcv_saddr));
 886
 887         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
 888                      offsetof(struct sock, sk_v6_daddr));
 889 #endif
 890 }
 891
 892 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
 893                          struct netlink_callback *cb,
 894                          const struct inet_diag_req_v2 *r, struct nlattr *bc)
 895 {
 896         bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
 897         struct net *net = sock_net(skb->sk);
 898         u32 idiag_states = r->idiag_states;
 899         int i, num, s_i, s_num;
 900         struct sock *sk;
 901
 902         if (idiag_states & TCPF_SYN_RECV)
 903                 idiag_states |= TCPF_NEW_SYN_RECV;
 904         s_i = cb->args[1];
 905         s_num = num = cb->args[2];
 906
 907         if (cb->args[0] == 0) {
 908                 if (!(idiag_states & TCPF_LISTEN) || r->id.idiag_dport)
 909                         goto skip_listen_ht;
 910
 911                 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
 912                         struct inet_listen_hashbucket *ilb;
 913
 914                         num = 0;
 915                         ilb = &hashinfo->listening_hash[i];
 916                         spin_lock(&ilb->lock);
 917                         sk_for_each(sk, &ilb->head) {
 918                                 struct inet_sock *inet = inet_sk(sk);
 919
 920                                 if (!net_eq(sock_net(sk), net))
 921                                         continue;
 922
 923                                 if (num < s_num) {
 924                                         num++;
 925                                         continue;
 926                                 }
 927
 928                                 if (r->sdiag_family != AF_UNSPEC &&
 929                                     sk->sk_family != r->sdiag_family)
 930                                         goto next_listen;
 931
 932                                 if (r->id.idiag_sport != inet->inet_sport &&
 933                                     r->id.idiag_sport)
 934                                         goto next_listen;
 935
 936                                 if (inet_csk_diag_dump(sk, skb, cb, r,
 937                                                        bc, net_admin) < 0) {
 938                                         spin_unlock(&ilb->lock);
 939                                         goto done;
 940                                 }
 941
 942 next_listen:
 943                                 ++num;
 944                         }
 945                         spin_unlock(&ilb->lock);
 946
 947                         s_num = 0;
 948                 }
 949 skip_listen_ht:
 950                 cb->args[0] = 1;
 951                 s_i = num = s_num = 0;
 952         }
 953
 954         if (!(idiag_states & ~TCPF_LISTEN))
 955                 goto out;
 956
 957 #define SKARR_SZ 16
 958         for (i = s_i; i <= hashinfo->ehash_mask; i++) {
 959                 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
 960                 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
 961                 struct hlist_nulls_node *node;
 962                 struct sock *sk_arr[SKARR_SZ];
 963                 int num_arr[SKARR_SZ];
 964                 int idx, accum, res;
 965
 966                 if (hlist_nulls_empty(&head->chain))
 967                         continue;
 968
 969                 if (i > s_i)
 970                         s_num = 0;
 971
 972 next_chunk:
 973                 num = 0;
 974                 accum = 0;
 975                 spin_lock_bh(lock);
 976                 sk_nulls_for_each(sk, node, &head->chain) {
 977                         int state;
 978
 979                         if (!net_eq(sock_net(sk), net))
 980                                 continue;
 981                         if (num < s_num)
 982                                 goto next_normal;
 983                         state = (sk->sk_state == TCP_TIME_WAIT) ?
 984                                 inet_twsk(sk)->tw_substate : sk->sk_state;
 985                         if (!(idiag_states & (1 << state)))
 986                                 goto next_normal;
 987                         if (r->sdiag_family != AF_UNSPEC &&
 988                             sk->sk_family != r->sdiag_family)
 989                                 goto next_normal;
 990                         if (r->id.idiag_sport != htons(sk->sk_num) &&
 991                             r->id.idiag_sport)
 992                                 goto next_normal;
 993                         if (r->id.idiag_dport != sk->sk_dport &&
 994                             r->id.idiag_dport)
 995                                 goto next_normal;
 996                         twsk_build_assert();
 997
 998                         if (!inet_diag_bc_sk(bc, sk))
 999                                 goto next_normal;
1000
1001                         if (!refcount_inc_not_zero(&sk->sk_refcnt))
1002                                 goto next_normal;
1003
1004                         num_arr[accum] = num;
1005                         sk_arr[accum] = sk;
1006                         if (++accum == SKARR_SZ)
1007                                 break;
1008 next_normal:
1009                         ++num;
1010                 }
1011                 spin_unlock_bh(lock);
1012                 res = 0;
1013                 for (idx = 0; idx < accum; idx++) {
1014                         if (res >= 0) {
1015                                 res = sk_diag_fill(sk_arr[idx], skb, r,
1016                                            sk_user_ns(NETLINK_CB(cb->skb).sk),
1017                                            NETLINK_CB(cb->skb).portid,
1018                                            cb->nlh->nlmsg_seq, NLM_F_MULTI,
1019                                            cb->nlh, net_admin);
1020                                 if (res < 0)
1021                                         num = num_arr[idx];
1022                         }
1023                         sock_gen_put(sk_arr[idx]);
1024                 }
1025                 if (res < 0)
1026                         break;
1027                 cond_resched();
1028                 if (accum == SKARR_SZ) {
1029                         s_num = num + 1;
1030                         goto next_chunk;
1031                 }
1032         }
1033
1034 done:
1035         cb->args[1] = i;
1036         cb->args[2] = num;
1037 out:
1038         ;
1039 }
1040 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
1041
1042 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
1043                             const struct inet_diag_req_v2 *r,
1044                             struct nlattr *bc)
1045 {
1046         const struct inet_diag_handler *handler;
1047         int err = 0;
1048
1049         handler = inet_diag_lock_handler(r->sdiag_protocol);
1050         if (!IS_ERR(handler))
1051                 handler->dump(skb, cb, r, bc);
1052         else
1053                 err = PTR_ERR(handler);
1054         inet_diag_unlock_handler(handler);
1055
1056         return err ? : skb->len;
1057 }
1058
1059 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
1060 {
1061         int hdrlen = sizeof(struct inet_diag_req_v2);
1062         struct nlattr *bc = NULL;
1063
1064         if (nlmsg_attrlen(cb->nlh, hdrlen))
1065                 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1066
1067         return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
1068 }
1069
1070 static int inet_diag_type2proto(int type)
1071 {
1072         switch (type) {
1073         case TCPDIAG_GETSOCK:
1074                 return IPPROTO_TCP;
1075         case DCCPDIAG_GETSOCK:
1076                 return IPPROTO_DCCP;
1077         default:
1078                 return 0;
1079         }
1080 }
1081
1082 static int inet_diag_dump_compat(struct sk_buff *skb,
1083                                  struct netlink_callback *cb)
1084 {
1085         struct inet_diag_req *rc = nlmsg_data(cb->nlh);
1086         int hdrlen = sizeof(struct inet_diag_req);
1087         struct inet_diag_req_v2 req;
1088         struct nlattr *bc = NULL;
1089
1090         req.sdiag_family = AF_UNSPEC; /* compatibility */
1091         req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1092         req.idiag_ext = rc->idiag_ext;
1093         req.idiag_states = rc->idiag_states;
1094         req.id = rc->id;
1095
1096         if (nlmsg_attrlen(cb->nlh, hdrlen))
1097                 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1098
1099         return __inet_diag_dump(skb, cb, &req, bc);
1100 }
1101
1102 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1103                                       const struct nlmsghdr *nlh)
1104 {
1105         struct inet_diag_req *rc = nlmsg_data(nlh);
1106         struct inet_diag_req_v2 req;
1107
1108         req.sdiag_family = rc->idiag_family;
1109         req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1110         req.idiag_ext = rc->idiag_ext;
1111         req.idiag_states = rc->idiag_states;
1112         req.id = rc->id;
1113
1114         return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req);
1115 }
1116
1117 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1118 {
1119         int hdrlen = sizeof(struct inet_diag_req);
1120         struct net *net = sock_net(skb->sk);
1121
1122         if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1123             nlmsg_len(nlh) < hdrlen)
1124                 return -EINVAL;
1125
1126         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1127                 if (nlmsg_attrlen(nlh, hdrlen)) {
1128                         struct nlattr *attr;
1129                         int err;
1130
1131                         attr = nlmsg_find_attr(nlh, hdrlen,
1132                                                INET_DIAG_REQ_BYTECODE);
1133                         err = inet_diag_bc_audit(attr, skb);
1134                         if (err)
1135                                 return err;
1136                 }
1137                 {
1138                         struct netlink_dump_control c = {
1139                                 .dump = inet_diag_dump_compat,
1140                         };
1141                         return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1142                 }
1143         }
1144
1145         return inet_diag_get_exact_compat(skb, nlh);
1146 }
1147
1148 static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
1149 {
1150         int hdrlen = sizeof(struct inet_diag_req_v2);
1151         struct net *net = sock_net(skb->sk);
1152
1153         if (nlmsg_len(h) < hdrlen)
1154                 return -EINVAL;
1155
1156         if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1157             h->nlmsg_flags & NLM_F_DUMP) {
1158                 if (nlmsg_attrlen(h, hdrlen)) {
1159                         struct nlattr *attr;
1160                         int err;
1161
1162                         attr = nlmsg_find_attr(h, hdrlen,
1163                                                INET_DIAG_REQ_BYTECODE);
1164                         err = inet_diag_bc_audit(attr, skb);
1165                         if (err)
1166                                 return err;
1167                 }
1168                 {
1169                         struct netlink_dump_control c = {
1170                                 .dump = inet_diag_dump,
1171                         };
1172                         return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1173                 }
1174         }
1175
1176         return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h));
1177 }
1178
1179 static
1180 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1181 {
1182         const struct inet_diag_handler *handler;
1183         struct nlmsghdr *nlh;
1184         struct nlattr *attr;
1185         struct inet_diag_msg *r;
1186         void *info = NULL;
1187         int err = 0;
1188
1189         nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1190         if (!nlh)
1191                 return -ENOMEM;
1192
1193         r = nlmsg_data(nlh);
1194         memset(r, 0, sizeof(*r));
1195         inet_diag_msg_common_fill(r, sk);
1196         if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1197                 r->id.idiag_sport = inet_sk(sk)->inet_sport;
1198         r->idiag_state = sk->sk_state;
1199
1200         if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1201                 nlmsg_cancel(skb, nlh);
1202                 return err;
1203         }
1204
1205         handler = inet_diag_lock_handler(sk->sk_protocol);
1206         if (IS_ERR(handler)) {
1207                 inet_diag_unlock_handler(handler);
1208                 nlmsg_cancel(skb, nlh);
1209                 return PTR_ERR(handler);
1210         }
1211
1212         attr = handler->idiag_info_size
1213                 ? nla_reserve_64bit(skb, INET_DIAG_INFO,
1214                                     handler->idiag_info_size,
1215                                     INET_DIAG_PAD)
1216                 : NULL;
1217         if (attr)
1218                 info = nla_data(attr);
1219
1220         handler->idiag_get_info(sk, r, info);
1221         inet_diag_unlock_handler(handler);
1222
1223         nlmsg_end(skb, nlh);
1224         return 0;
1225 }
1226
1227 static const struct sock_diag_handler inet_diag_handler = {
1228         .family = AF_INET,
1229         .dump = inet_diag_handler_cmd,
1230         .get_info = inet_diag_handler_get_info,
1231         .destroy = inet_diag_handler_cmd,
1232 };
1233
1234 static const struct sock_diag_handler inet6_diag_handler = {
1235         .family = AF_INET6,
1236         .dump = inet_diag_handler_cmd,
1237         .get_info = inet_diag_handler_get_info,
1238         .destroy = inet_diag_handler_cmd,
1239 };
1240
1241 int inet_diag_register(const struct inet_diag_handler *h)
1242 {
1243         const __u16 type = h->idiag_type;
1244         int err = -EINVAL;
1245
1246         if (type >= IPPROTO_MAX)
1247                 goto out;
1248
1249         mutex_lock(&inet_diag_table_mutex);
1250         err = -EEXIST;
1251         if (!inet_diag_table[type]) {
1252                 inet_diag_table[type] = h;
1253                 err = 0;
1254         }
1255         mutex_unlock(&inet_diag_table_mutex);
1256 out:
1257         return err;
1258 }
1259 EXPORT_SYMBOL_GPL(inet_diag_register);
1260
1261 void inet_diag_unregister(const struct inet_diag_handler *h)
1262 {
1263         const __u16 type = h->idiag_type;
1264
1265         if (type >= IPPROTO_MAX)
1266                 return;
1267
1268         mutex_lock(&inet_diag_table_mutex);
1269         inet_diag_table[type] = NULL;
1270         mutex_unlock(&inet_diag_table_mutex);
1271 }
1272 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1273
1274 static int __init inet_diag_init(void)
1275 {
1276         const int inet_diag_table_size = (IPPROTO_MAX *
1277                                           sizeof(struct inet_diag_handler *));
1278         int err = -ENOMEM;
1279
1280         inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1281         if (!inet_diag_table)
1282                 goto out;
1283
1284         err = sock_diag_register(&inet_diag_handler);
1285         if (err)
1286                 goto out_free_nl;
1287
1288         err = sock_diag_register(&inet6_diag_handler);
1289         if (err)
1290                 goto out_free_inet;
1291
1292         sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1293 out:
1294         return err;
1295
1296 out_free_inet:
1297         sock_diag_unregister(&inet_diag_handler);
1298 out_free_nl:
1299         kfree(inet_diag_table);
1300         goto out;
1301 }
1302
1303 static void __exit inet_diag_exit(void)
1304 {
1305         sock_diag_unregister(&inet6_diag_handler);
1306         sock_diag_unregister(&inet_diag_handler);
1307         sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1308         kfree(inet_diag_table);
1309 }
1310
1311 module_init(inet_diag_init);
1312 module_exit(inet_diag_exit);
1313 MODULE_LICENSE("GPL");
1314 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1315 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);