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                 request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
  57                                NETLINK_SOCK_DIAG, AF_INET, proto);
  58
  59         mutex_lock(&inet_diag_table_mutex);
  60         if (!inet_diag_table[proto])
  61                 return ERR_PTR(-ENOENT);
  62
  63         return inet_diag_table[proto];
  64 }
  65
  66 static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
  67 {
  68         mutex_unlock(&inet_diag_table_mutex);
  69 }
  70
  71 void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk)
  72 {
  73         r->idiag_family = sk->sk_family;
  74
  75         r->id.idiag_sport = htons(sk->sk_num);
  76         r->id.idiag_dport = sk->sk_dport;
  77         r->id.idiag_if = sk->sk_bound_dev_if;
  78         sock_diag_save_cookie(sk, r->id.idiag_cookie);
  79
  80 #if IS_ENABLED(CONFIG_IPV6)
  81         if (sk->sk_family == AF_INET6) {
  82                 *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
  83                 *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
  84         } else
  85 #endif
  86         {
  87         memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
  88         memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
  89
  90         r->id.idiag_src[0] = sk->sk_rcv_saddr;
  91         r->id.idiag_dst[0] = sk->sk_daddr;
  92         }
  93 }
  94 EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill);
  95
  96 static size_t inet_sk_attr_size(struct sock *sk,
  97                                 const struct inet_diag_req_v2 *req,
  98                                 bool net_admin)
  99 {
 100         const struct inet_diag_handler *handler;
 101         size_t aux = 0;
 102
 103         handler = inet_diag_table[req->sdiag_protocol];
 104         if (handler && handler->idiag_get_aux_size)
 105                 aux = handler->idiag_get_aux_size(sk, net_admin);
 106
 107         return    nla_total_size(sizeof(struct tcp_info))
 108                 + nla_total_size(sizeof(struct inet_diag_msg))
 109                 + inet_diag_msg_attrs_size()
 110                 + nla_total_size(sizeof(struct inet_diag_meminfo))
 111                 + nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
 112                 + nla_total_size(TCP_CA_NAME_MAX)
 113                 + nla_total_size(sizeof(struct tcpvegas_info))
 114                 + aux
 115                 + 64;
 116 }
 117
 118 int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
 119                              struct inet_diag_msg *r, int ext,
 120                              struct user_namespace *user_ns,
 121                              bool net_admin)
 122 {
 123         const struct inet_sock *inet = inet_sk(sk);
 124
 125         if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
 126                 goto errout;
 127
 128         /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
 129          * hence this needs to be included regardless of socket family.
 130          */
 131         if (ext & (1 << (INET_DIAG_TOS - 1)))
 132                 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
 133                         goto errout;
 134
 135 #if IS_ENABLED(CONFIG_IPV6)
 136         if (r->idiag_family == AF_INET6) {
 137                 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
 138                         if (nla_put_u8(skb, INET_DIAG_TCLASS,
 139                                        inet6_sk(sk)->tclass) < 0)
 140                                 goto errout;
 141
 142                 if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
 143                     nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
 144                         goto errout;
 145         }
 146 #endif
 147
 148         if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, sk->sk_mark))
 149                 goto errout;
 150
 151         if (ext & (1 << (INET_DIAG_CLASS_ID - 1)) ||
 152             ext & (1 << (INET_DIAG_TCLASS - 1))) {
 153                 u32 classid = 0;
 154
 155 #ifdef CONFIG_SOCK_CGROUP_DATA
 156                 classid = sock_cgroup_classid(&sk->sk_cgrp_data);
 157 #endif
 158                 /* Fallback to socket priority if class id isn't set.
 159                  * Classful qdiscs use it as direct reference to class.
 160                  * For cgroup2 classid is always zero.
 161                  */
 162                 if (!classid)
 163                         classid = sk->sk_priority;
 164
 165                 if (nla_put_u32(skb, INET_DIAG_CLASS_ID, classid))
 166                         goto errout;
 167         }
 168
 169         r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
 170         r->idiag_inode = sock_i_ino(sk);
 171
 172         return 0;
 173 errout:
 174         return 1;
 175 }
 176 EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill);
 177
 178 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
 179                       struct sk_buff *skb, const struct inet_diag_req_v2 *req,
 180                       struct user_namespace *user_ns,
 181                       u32 portid, u32 seq, u16 nlmsg_flags,
 182                       const struct nlmsghdr *unlh,
 183                       bool net_admin)
 184 {
 185         const struct tcp_congestion_ops *ca_ops;
 186         const struct inet_diag_handler *handler;
 187         int ext = req->idiag_ext;
 188         struct inet_diag_msg *r;
 189         struct nlmsghdr  *nlh;
 190         struct nlattr *attr;
 191         void *info = NULL;
 192
 193         handler = inet_diag_table[req->sdiag_protocol];
 194         BUG_ON(!handler);
 195
 196         nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
 197                         nlmsg_flags);
 198         if (!nlh)
 199                 return -EMSGSIZE;
 200
 201         r = nlmsg_data(nlh);
 202         BUG_ON(!sk_fullsock(sk));
 203
 204         inet_diag_msg_common_fill(r, sk);
 205         r->idiag_state = sk->sk_state;
 206         r->idiag_timer = 0;
 207         r->idiag_retrans = 0;
 208
 209         if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns, net_admin))
 210                 goto errout;
 211
 212         if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
 213                 struct inet_diag_meminfo minfo = {
 214                         .idiag_rmem = sk_rmem_alloc_get(sk),
 215                         .idiag_wmem = sk->sk_wmem_queued,
 216                         .idiag_fmem = sk->sk_forward_alloc,
 217                         .idiag_tmem = sk_wmem_alloc_get(sk),
 218                 };
 219
 220                 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
 221                         goto errout;
 222         }
 223
 224         if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
 225                 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
 226                         goto errout;
 227
 228         /*
 229          * RAW sockets might have user-defined protocols assigned,
 230          * so report the one supplied on socket creation.
 231          */
 232         if (sk->sk_type == SOCK_RAW) {
 233                 if (nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))
 234                         goto errout;
 235         }
 236
 237         if (!icsk) {
 238                 handler->idiag_get_info(sk, r, NULL);
 239                 goto out;
 240         }
 241
 242         if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
 243             icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT ||
 244             icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
 245                 r->idiag_timer = 1;
 246                 r->idiag_retrans = icsk->icsk_retransmits;
 247                 r->idiag_expires =
 248                         jiffies_to_msecs(icsk->icsk_timeout - jiffies);
 249         } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
 250                 r->idiag_timer = 4;
 251                 r->idiag_retrans = icsk->icsk_probes_out;
 252                 r->idiag_expires =
 253                         jiffies_to_msecs(icsk->icsk_timeout - jiffies);
 254         } else if (timer_pending(&sk->sk_timer)) {
 255                 r->idiag_timer = 2;
 256                 r->idiag_retrans = icsk->icsk_probes_out;
 257                 r->idiag_expires =
 258                         jiffies_to_msecs(sk->sk_timer.expires - jiffies);
 259         } else {
 260                 r->idiag_timer = 0;
 261                 r->idiag_expires = 0;
 262         }
 263
 264         if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
 265                 attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
 266                                          handler->idiag_info_size,
 267                                          INET_DIAG_PAD);
 268                 if (!attr)
 269                         goto errout;
 270
 271                 info = nla_data(attr);
 272         }
 273
 274         if (ext & (1 << (INET_DIAG_CONG - 1))) {
 275                 int err = 0;
 276
 277                 rcu_read_lock();
 278                 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
 279                 if (ca_ops)
 280                         err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
 281                 rcu_read_unlock();
 282                 if (err < 0)
 283                         goto errout;
 284         }
 285
 286         handler->idiag_get_info(sk, r, info);
 287
 288         if (ext & (1 << (INET_DIAG_INFO - 1)) && handler->idiag_get_aux)
 289                 if (handler->idiag_get_aux(sk, net_admin, skb) < 0)
 290                         goto errout;
 291
 292         if (sk->sk_state < TCP_TIME_WAIT) {
 293                 union tcp_cc_info info;
 294                 size_t sz = 0;
 295                 int attr;
 296
 297                 rcu_read_lock();
 298                 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
 299                 if (ca_ops && ca_ops->get_info)
 300                         sz = ca_ops->get_info(sk, ext, &attr, &info);
 301                 rcu_read_unlock();
 302                 if (sz && nla_put(skb, attr, sz, &info) < 0)
 303                         goto errout;
 304         }
 305
 306 out:
 307         nlmsg_end(skb, nlh);
 308         return 0;
 309
 310 errout:
 311         nlmsg_cancel(skb, nlh);
 312         return -EMSGSIZE;
 313 }
 314 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
 315
 316 static int inet_csk_diag_fill(struct sock *sk,
 317                               struct sk_buff *skb,
 318                               const struct inet_diag_req_v2 *req,
 319                               struct user_namespace *user_ns,
 320                               u32 portid, u32 seq, u16 nlmsg_flags,
 321                               const struct nlmsghdr *unlh,
 322                               bool net_admin)
 323 {
 324         return inet_sk_diag_fill(sk, inet_csk(sk), skb, req, user_ns,
 325                                  portid, seq, nlmsg_flags, unlh, net_admin);
 326 }
 327
 328 static int inet_twsk_diag_fill(struct sock *sk,
 329                                struct sk_buff *skb,
 330                                u32 portid, u32 seq, u16 nlmsg_flags,
 331                                const struct nlmsghdr *unlh)
 332 {
 333         struct inet_timewait_sock *tw = inet_twsk(sk);
 334         struct inet_diag_msg *r;
 335         struct nlmsghdr *nlh;
 336         long tmo;
 337
 338         nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
 339                         nlmsg_flags);
 340         if (!nlh)
 341                 return -EMSGSIZE;
 342
 343         r = nlmsg_data(nlh);
 344         BUG_ON(tw->tw_state != TCP_TIME_WAIT);
 345
 346         tmo = tw->tw_timer.expires - jiffies;
 347         if (tmo < 0)
 348                 tmo = 0;
 349
 350         inet_diag_msg_common_fill(r, sk);
 351         r->idiag_retrans      = 0;
 352
 353         r->idiag_state        = tw->tw_substate;
 354         r->idiag_timer        = 3;
 355         r->idiag_expires      = jiffies_to_msecs(tmo);
 356         r->idiag_rqueue       = 0;
 357         r->idiag_wqueue       = 0;
 358         r->idiag_uid          = 0;
 359         r->idiag_inode        = 0;
 360
 361         nlmsg_end(skb, nlh);
 362         return 0;
 363 }
 364
 365 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
 366                               u32 portid, u32 seq, u16 nlmsg_flags,
 367                               const struct nlmsghdr *unlh, bool net_admin)
 368 {
 369         struct request_sock *reqsk = inet_reqsk(sk);
 370         struct inet_diag_msg *r;
 371         struct nlmsghdr *nlh;
 372         long tmo;
 373
 374         nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
 375                         nlmsg_flags);
 376         if (!nlh)
 377                 return -EMSGSIZE;
 378
 379         r = nlmsg_data(nlh);
 380         inet_diag_msg_common_fill(r, sk);
 381         r->idiag_state = TCP_SYN_RECV;
 382         r->idiag_timer = 1;
 383         r->idiag_retrans = reqsk->num_retrans;
 384
 385         BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
 386                      offsetof(struct sock, sk_cookie));
 387
 388         tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
 389         r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0;
 390         r->idiag_rqueue = 0;
 391         r->idiag_wqueue = 0;
 392         r->idiag_uid    = 0;
 393         r->idiag_inode  = 0;
 394
 395         if (net_admin && nla_put_u32(skb, INET_DIAG_MARK,
 396                                      inet_rsk(reqsk)->ir_mark)) {
 397                 nlmsg_cancel(skb, nlh);
 398                 return -EMSGSIZE;
 399         }
 400
 401         nlmsg_end(skb, nlh);
 402         return 0;
 403 }
 404
 405 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
 406                         const struct inet_diag_req_v2 *r,
 407                         struct user_namespace *user_ns,
 408                         u32 portid, u32 seq, u16 nlmsg_flags,
 409                         const struct nlmsghdr *unlh, bool net_admin)
 410 {
 411         if (sk->sk_state == TCP_TIME_WAIT)
 412                 return inet_twsk_diag_fill(sk, skb, portid, seq,
 413                                            nlmsg_flags, unlh);
 414
 415         if (sk->sk_state == TCP_NEW_SYN_RECV)
 416                 return inet_req_diag_fill(sk, skb, portid, seq,
 417                                           nlmsg_flags, unlh, net_admin);
 418
 419         return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
 420                                   nlmsg_flags, unlh, net_admin);
 421 }
 422
 423 struct sock *inet_diag_find_one_icsk(struct net *net,
 424                                      struct inet_hashinfo *hashinfo,
 425                                      const struct inet_diag_req_v2 *req)
 426 {
 427         struct sock *sk;
 428
 429         rcu_read_lock();
 430         if (req->sdiag_family == AF_INET)
 431                 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
 432                                  req->id.idiag_dport, req->id.idiag_src[0],
 433                                  req->id.idiag_sport, req->id.idiag_if);
 434 #if IS_ENABLED(CONFIG_IPV6)
 435         else if (req->sdiag_family == AF_INET6) {
 436                 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
 437                     ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
 438                         sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
 439                                          req->id.idiag_dport, req->id.idiag_src[3],
 440                                          req->id.idiag_sport, req->id.idiag_if);
 441                 else
 442                         sk = inet6_lookup(net, hashinfo, NULL, 0,
 443                                           (struct in6_addr *)req->id.idiag_dst,
 444                                           req->id.idiag_dport,
 445                                           (struct in6_addr *)req->id.idiag_src,
 446                                           req->id.idiag_sport,
 447                                           req->id.idiag_if);
 448         }
 449 #endif
 450         else {
 451                 rcu_read_unlock();
 452                 return ERR_PTR(-EINVAL);
 453         }
 454         rcu_read_unlock();
 455         if (!sk)
 456                 return ERR_PTR(-ENOENT);
 457
 458         if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
 459                 sock_gen_put(sk);
 460                 return ERR_PTR(-ENOENT);
 461         }
 462
 463         return sk;
 464 }
 465 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
 466
 467 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
 468                             struct sk_buff *in_skb,
 469                             const struct nlmsghdr *nlh,
 470                             const struct inet_diag_req_v2 *req)
 471 {
 472         bool net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN);
 473         struct net *net = sock_net(in_skb->sk);
 474         struct sk_buff *rep;
 475         struct sock *sk;
 476         int err;
 477
 478         sk = inet_diag_find_one_icsk(net, hashinfo, req);
 479         if (IS_ERR(sk))
 480                 return PTR_ERR(sk);
 481
 482         rep = nlmsg_new(inet_sk_attr_size(sk, req, net_admin), GFP_KERNEL);
 483         if (!rep) {
 484                 err = -ENOMEM;
 485                 goto out;
 486         }
 487
 488         err = sk_diag_fill(sk, rep, req,
 489                            sk_user_ns(NETLINK_CB(in_skb).sk),
 490                            NETLINK_CB(in_skb).portid,
 491                            nlh->nlmsg_seq, 0, nlh, net_admin);
 492         if (err < 0) {
 493                 WARN_ON(err == -EMSGSIZE);
 494                 nlmsg_free(rep);
 495                 goto out;
 496         }
 497         err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
 498                               MSG_DONTWAIT);
 499         if (err > 0)
 500                 err = 0;
 501
 502 out:
 503         if (sk)
 504                 sock_gen_put(sk);
 505
 506         return err;
 507 }
 508 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
 509
 510 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
 511                                const struct nlmsghdr *nlh,
 512                                const struct inet_diag_req_v2 *req)
 513 {
 514         const struct inet_diag_handler *handler;
 515         int err;
 516
 517         handler = inet_diag_lock_handler(req->sdiag_protocol);
 518         if (IS_ERR(handler))
 519                 err = PTR_ERR(handler);
 520         else if (cmd == SOCK_DIAG_BY_FAMILY)
 521                 err = handler->dump_one(in_skb, nlh, req);
 522         else if (cmd == SOCK_DESTROY && handler->destroy)
 523                 err = handler->destroy(in_skb, req);
 524         else
 525                 err = -EOPNOTSUPP;
 526         inet_diag_unlock_handler(handler);
 527
 528         return err;
 529 }
 530
 531 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
 532 {
 533         int words = bits >> 5;
 534
 535         bits &= 0x1f;
 536
 537         if (words) {
 538                 if (memcmp(a1, a2, words << 2))
 539                         return 0;
 540         }
 541         if (bits) {
 542                 __be32 w1, w2;
 543                 __be32 mask;
 544
 545                 w1 = a1[words];
 546                 w2 = a2[words];
 547
 548                 mask = htonl((0xffffffff) << (32 - bits));
 549
 550                 if ((w1 ^ w2) & mask)
 551                         return 0;
 552         }
 553
 554         return 1;
 555 }
 556
 557 static int inet_diag_bc_run(const struct nlattr *_bc,
 558                             const struct inet_diag_entry *entry)
 559 {
 560         const void *bc = nla_data(_bc);
 561         int len = nla_len(_bc);
 562
 563         while (len > 0) {
 564                 int yes = 1;
 565                 const struct inet_diag_bc_op *op = bc;
 566
 567                 switch (op->code) {
 568                 case INET_DIAG_BC_NOP:
 569                         break;
 570                 case INET_DIAG_BC_JMP:
 571                         yes = 0;
 572                         break;
 573                 case INET_DIAG_BC_S_GE:
 574                         yes = entry->sport >= op[1].no;
 575                         break;
 576                 case INET_DIAG_BC_S_LE:
 577                         yes = entry->sport <= op[1].no;
 578                         break;
 579                 case INET_DIAG_BC_D_GE:
 580                         yes = entry->dport >= op[1].no;
 581                         break;
 582                 case INET_DIAG_BC_D_LE:
 583                         yes = entry->dport <= op[1].no;
 584                         break;
 585                 case INET_DIAG_BC_AUTO:
 586                         yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
 587                         break;
 588                 case INET_DIAG_BC_S_COND:
 589                 case INET_DIAG_BC_D_COND: {
 590                         const struct inet_diag_hostcond *cond;
 591                         const __be32 *addr;
 592
 593                         cond = (const struct inet_diag_hostcond *)(op + 1);
 594                         if (cond->port != -1 &&
 595                             cond->port != (op->code == INET_DIAG_BC_S_COND ?
 596                                              entry->sport : entry->dport)) {
 597                                 yes = 0;
 598                                 break;
 599                         }
 600
 601                         if (op->code == INET_DIAG_BC_S_COND)
 602                                 addr = entry->saddr;
 603                         else
 604                                 addr = entry->daddr;
 605
 606                         if (cond->family != AF_UNSPEC &&
 607                             cond->family != entry->family) {
 608                                 if (entry->family == AF_INET6 &&
 609                                     cond->family == AF_INET) {
 610                                         if (addr[0] == 0 && addr[1] == 0 &&
 611                                             addr[2] == htonl(0xffff) &&
 612                                             bitstring_match(addr + 3,
 613                                                             cond->addr,
 614                                                             cond->prefix_len))
 615                                                 break;
 616                                 }
 617                                 yes = 0;
 618                                 break;
 619                         }
 620
 621                         if (cond->prefix_len == 0)
 622                                 break;
 623                         if (bitstring_match(addr, cond->addr,
 624                                             cond->prefix_len))
 625                                 break;
 626                         yes = 0;
 627                         break;
 628                 }
 629                 case INET_DIAG_BC_DEV_COND: {
 630                         u32 ifindex;
 631
 632                         ifindex = *((const u32 *)(op + 1));
 633                         if (ifindex != entry->ifindex)
 634                                 yes = 0;
 635                         break;
 636                 }
 637                 case INET_DIAG_BC_MARK_COND: {
 638                         struct inet_diag_markcond *cond;
 639
 640                         cond = (struct inet_diag_markcond *)(op + 1);
 641                         if ((entry->mark & cond->mask) != cond->mark)
 642                                 yes = 0;
 643                         break;
 644                 }
 645                 }
 646
 647                 if (yes) {
 648                         len -= op->yes;
 649                         bc += op->yes;
 650                 } else {
 651                         len -= op->no;
 652                         bc += op->no;
 653                 }
 654         }
 655         return len == 0;
 656 }
 657
 658 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
 659  */
 660 static void entry_fill_addrs(struct inet_diag_entry *entry,
 661                              const struct sock *sk)
 662 {
 663 #if IS_ENABLED(CONFIG_IPV6)
 664         if (sk->sk_family == AF_INET6) {
 665                 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
 666                 entry->daddr = sk->sk_v6_daddr.s6_addr32;
 667         } else
 668 #endif
 669         {
 670                 entry->saddr = &sk->sk_rcv_saddr;
 671                 entry->daddr = &sk->sk_daddr;
 672         }
 673 }
 674
 675 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
 676 {
 677         struct inet_sock *inet = inet_sk(sk);
 678         struct inet_diag_entry entry;
 679
 680         if (!bc)
 681                 return 1;
 682
 683         entry.family = sk->sk_family;
 684         entry_fill_addrs(&entry, sk);
 685         entry.sport = inet->inet_num;
 686         entry.dport = ntohs(inet->inet_dport);
 687         entry.ifindex = sk->sk_bound_dev_if;
 688         entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
 689         if (sk_fullsock(sk))
 690                 entry.mark = sk->sk_mark;
 691         else if (sk->sk_state == TCP_NEW_SYN_RECV)
 692                 entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark;
 693         else
 694                 entry.mark = 0;
 695
 696         return inet_diag_bc_run(bc, &entry);
 697 }
 698 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
 699
 700 static int valid_cc(const void *bc, int len, int cc)
 701 {
 702         while (len >= 0) {
 703                 const struct inet_diag_bc_op *op = bc;
 704
 705                 if (cc > len)
 706                         return 0;
 707                 if (cc == len)
 708                         return 1;
 709                 if (op->yes < 4 || op->yes & 3)
 710                         return 0;
 711                 len -= op->yes;
 712                 bc  += op->yes;
 713         }
 714         return 0;
 715 }
 716
 717 /* data is u32 ifindex */
 718 static bool valid_devcond(const struct inet_diag_bc_op *op, int len,
 719                           int *min_len)
 720 {
 721         /* Check ifindex space. */
 722         *min_len += sizeof(u32);
 723         if (len < *min_len)
 724                 return false;
 725
 726         return true;
 727 }
 728 /* Validate an inet_diag_hostcond. */
 729 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
 730                            int *min_len)
 731 {
 732         struct inet_diag_hostcond *cond;
 733         int addr_len;
 734
 735         /* Check hostcond space. */
 736         *min_len += sizeof(struct inet_diag_hostcond);
 737         if (len < *min_len)
 738                 return false;
 739         cond = (struct inet_diag_hostcond *)(op + 1);
 740
 741         /* Check address family and address length. */
 742         switch (cond->family) {
 743         case AF_UNSPEC:
 744                 addr_len = 0;
 745                 break;
 746         case AF_INET:
 747                 addr_len = sizeof(struct in_addr);
 748                 break;
 749         case AF_INET6:
 750                 addr_len = sizeof(struct in6_addr);
 751                 break;
 752         default:
 753                 return false;
 754         }
 755         *min_len += addr_len;
 756         if (len < *min_len)
 757                 return false;
 758
 759         /* Check prefix length (in bits) vs address length (in bytes). */
 760         if (cond->prefix_len > 8 * addr_len)
 761                 return false;
 762
 763         return true;
 764 }
 765
 766 /* Validate a port comparison operator. */
 767 static bool valid_port_comparison(const struct inet_diag_bc_op *op,
 768                                   int len, int *min_len)
 769 {
 770         /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
 771         *min_len += sizeof(struct inet_diag_bc_op);
 772         if (len < *min_len)
 773                 return false;
 774         return true;
 775 }
 776
 777 static bool valid_markcond(const struct inet_diag_bc_op *op, int len,
 778                            int *min_len)
 779 {
 780         *min_len += sizeof(struct inet_diag_markcond);
 781         return len >= *min_len;
 782 }
 783
 784 static int inet_diag_bc_audit(const struct nlattr *attr,
 785                               const struct sk_buff *skb)
 786 {
 787         bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN);
 788         const void *bytecode, *bc;
 789         int bytecode_len, len;
 790
 791         if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op))
 792                 return -EINVAL;
 793
 794         bytecode = bc = nla_data(attr);
 795         len = bytecode_len = nla_len(attr);
 796
 797         while (len > 0) {
 798                 int min_len = sizeof(struct inet_diag_bc_op);
 799                 const struct inet_diag_bc_op *op = bc;
 800
 801                 switch (op->code) {
 802                 case INET_DIAG_BC_S_COND:
 803                 case INET_DIAG_BC_D_COND:
 804                         if (!valid_hostcond(bc, len, &min_len))
 805                                 return -EINVAL;
 806                         break;
 807                 case INET_DIAG_BC_DEV_COND:
 808                         if (!valid_devcond(bc, len, &min_len))
 809                                 return -EINVAL;
 810                         break;
 811                 case INET_DIAG_BC_S_GE:
 812                 case INET_DIAG_BC_S_LE:
 813                 case INET_DIAG_BC_D_GE:
 814                 case INET_DIAG_BC_D_LE:
 815                         if (!valid_port_comparison(bc, len, &min_len))
 816                                 return -EINVAL;
 817                         break;
 818                 case INET_DIAG_BC_MARK_COND:
 819                         if (!net_admin)
 820                                 return -EPERM;
 821                         if (!valid_markcond(bc, len, &min_len))
 822                                 return -EINVAL;
 823                         break;
 824                 case INET_DIAG_BC_AUTO:
 825                 case INET_DIAG_BC_JMP:
 826                 case INET_DIAG_BC_NOP:
 827                         break;
 828                 default:
 829                         return -EINVAL;
 830                 }
 831
 832                 if (op->code != INET_DIAG_BC_NOP) {
 833                         if (op->no < min_len || op->no > len + 4 || op->no & 3)
 834                                 return -EINVAL;
 835                         if (op->no < len &&
 836                             !valid_cc(bytecode, bytecode_len, len - op->no))
 837                                 return -EINVAL;
 838                 }
 839
 840                 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
 841                         return -EINVAL;
 842                 bc  += op->yes;
 843                 len -= op->yes;
 844         }
 845         return len == 0 ? 0 : -EINVAL;
 846 }
 847
 848 static int inet_csk_diag_dump(struct sock *sk,
 849                               struct sk_buff *skb,
 850                               struct netlink_callback *cb,
 851                               const struct inet_diag_req_v2 *r,
 852                               const struct nlattr *bc,
 853                               bool net_admin)
 854 {
 855         if (!inet_diag_bc_sk(bc, sk))
 856                 return 0;
 857
 858         return inet_csk_diag_fill(sk, skb, r,
 859                                   sk_user_ns(NETLINK_CB(cb->skb).sk),
 860                                   NETLINK_CB(cb->skb).portid,
 861                                   cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh,
 862                                   net_admin);
 863 }
 864
 865 static void twsk_build_assert(void)
 866 {
 867         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
 868                      offsetof(struct sock, sk_family));
 869
 870         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
 871                      offsetof(struct inet_sock, inet_num));
 872
 873         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
 874                      offsetof(struct inet_sock, inet_dport));
 875
 876         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
 877                      offsetof(struct inet_sock, inet_rcv_saddr));
 878
 879         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
 880                      offsetof(struct inet_sock, inet_daddr));
 881
 882 #if IS_ENABLED(CONFIG_IPV6)
 883         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
 884                      offsetof(struct sock, sk_v6_rcv_saddr));
 885
 886         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
 887                      offsetof(struct sock, sk_v6_daddr));
 888 #endif
 889 }
 890
 891 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
 892                          struct netlink_callback *cb,
 893                          const struct inet_diag_req_v2 *r, struct nlattr *bc)
 894 {
 895         bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
 896         struct net *net = sock_net(skb->sk);
 897         u32 idiag_states = r->idiag_states;
 898         int i, num, s_i, s_num;
 899         struct sock *sk;
 900
 901         if (idiag_states & TCPF_SYN_RECV)
 902                 idiag_states |= TCPF_NEW_SYN_RECV;
 903         s_i = cb->args[1];
 904         s_num = num = cb->args[2];
 905
 906         if (cb->args[0] == 0) {
 907                 if (!(idiag_states & TCPF_LISTEN) || r->id.idiag_dport)
 908                         goto skip_listen_ht;
 909
 910                 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
 911                         struct inet_listen_hashbucket *ilb;
 912                         struct hlist_nulls_node *node;
 913
 914                         num = 0;
 915                         ilb = &hashinfo->listening_hash[i];
 916                         spin_lock(&ilb->lock);
 917                         sk_nulls_for_each(sk, node, &ilb->nulls_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 */);