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