net/ipv4/inet_diag.c

   1 /*
   2  * inet_diag.c  Module for monitoring INET transport protocols sockets.
   3  *
   4  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
   5  *
   6  *      This program is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU General Public License
   8  *      as published by the Free Software Foundation; either version
   9  *      2 of the License, or (at your option) any later version.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/types.h>
  15 #include <linux/fcntl.h>
  16 #include <linux/random.h>
  17 #include <linux/slab.h>
  18 #include <linux/cache.h>
  19 #include <linux/init.h>
  20 #include <linux/time.h>
  21
  22 #include <net/icmp.h>
  23 #include <net/tcp.h>
  24 #include <net/ipv6.h>
  25 #include <net/inet_common.h>
  26 #include <net/inet_connection_sock.h>
  27 #include <net/inet_hashtables.h>
  28 #include <net/inet_timewait_sock.h>
  29 #include <net/inet6_hashtables.h>
  30 #include <net/netlink.h>
  31
  32 #include <linux/inet.h>
  33 #include <linux/stddef.h>
  34
  35 #include <linux/inet_diag.h>
  36 #include <linux/sock_diag.h>
  37
  38 static const struct inet_diag_handler **inet_diag_table;
  39
  40 struct inet_diag_entry {
  41         const __be32 *saddr;
  42         const __be32 *daddr;
  43         u16 sport;
  44         u16 dport;
  45         u16 family;
  46         u16 userlocks;
  47         u32 ifindex;
  48         u32 mark;
  49 };
  50
  51 static DEFINE_MUTEX(inet_diag_table_mutex);
  52
  53 static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
  54 {
  55         if (!inet_diag_table[proto])
  56                 sock_load_diag_module(AF_INET, proto);
  57
  58         mutex_lock(&inet_diag_table_mutex);
  59         if (!inet_diag_table[proto])
  60                 return ERR_PTR(-ENOENT);
  61
  62         return inet_diag_table[proto];
  63 }
  64
  65 static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
  66 {
  67         mutex_unlock(&inet_diag_table_mutex);
  68 }
  69
  70 void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk)
  71 {
  72         r->idiag_family = sk->sk_family;
  73
  74         r->id.idiag_sport = htons(sk->sk_num);
  75         r->id.idiag_dport = sk->sk_dport;
  76         r->id.idiag_if = sk->sk_bound_dev_if;
  77         sock_diag_save_cookie(sk, r->id.idiag_cookie);
  78
  79 #if IS_ENABLED(CONFIG_IPV6)
  80         if (sk->sk_family == AF_INET6) {
  81                 *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
  82                 *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
  83         } else
  84 #endif
  85         {
  86         memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
  87         memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
  88
  89         r->id.idiag_src[0] = sk->sk_rcv_saddr;
  90         r->id.idiag_dst[0] = sk->sk_daddr;
  91         }
  92 }
  93 EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill);
  94
  95 static size_t inet_sk_attr_size(struct sock *sk,
  96                                 const struct inet_diag_req_v2 *req,
  97                                 bool net_admin)
  98 {
  99         const struct inet_diag_handler *handler;
 100         size_t aux = 0;
 101
 102         handler = inet_diag_table[req->sdiag_protocol];
 103         if (handler && handler->idiag_get_aux_size)
 104                 aux = handler->idiag_get_aux_size(sk, net_admin);
 105
 106         return    nla_total_size(sizeof(struct tcp_info))
 107                 + nla_total_size(sizeof(struct inet_diag_msg))
 108                 + inet_diag_msg_attrs_size()
 109                 + nla_total_size(sizeof(struct inet_diag_meminfo))
 110                 + nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
 111                 + nla_total_size(TCP_CA_NAME_MAX)
 112                 + nla_total_size(sizeof(struct tcpvegas_info))
 113                 + aux
 114                 + 64;
 115 }
 116
 117 int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
 118                              struct inet_diag_msg *r, int ext,
 119                              struct user_namespace *user_ns,
 120                              bool net_admin)
 121 {
 122         const struct inet_sock *inet = inet_sk(sk);
 123
 124         if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
 125                 goto errout;
 126
 127         /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
 128          * hence this needs to be included regardless of socket family.
 129          */
 130         if (ext & (1 << (INET_DIAG_TOS - 1)))
 131                 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
 132                         goto errout;
 133
 134 #if IS_ENABLED(CONFIG_IPV6)
 135         if (r->idiag_family == AF_INET6) {
 136                 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
 137                         if (nla_put_u8(skb, INET_DIAG_TCLASS,
 138                                        inet6_sk(sk)->tclass) < 0)
 139                                 goto errout;
 140
 141                 if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
 142                     nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
 143                         goto errout;
 144         }
 145 #endif
 146
 147         if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, sk->sk_mark))
 148                 goto errout;
 149
 150         if (ext & (1 << (INET_DIAG_CLASS_ID - 1)) ||
 151             ext & (1 << (INET_DIAG_TCLASS - 1))) {
 152                 u32 classid = 0;
 153
 154 #ifdef CONFIG_SOCK_CGROUP_DATA
 155                 classid = sock_cgroup_classid(&sk->sk_cgrp_data);
 156 #endif
 157                 /* Fallback to socket priority if class id isn't set.
 158                  * Classful qdiscs use it as direct reference to class.
 159                  * For cgroup2 classid is always zero.
 160                  */
 161                 if (!classid)
 162                         classid = sk->sk_priority;
 163
 164                 if (nla_put_u32(skb, INET_DIAG_CLASS_ID, classid))
 165                         goto errout;
 166         }
 167
 168         r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
 169         r->idiag_inode = sock_i_ino(sk);
 170
 171         return 0;
 172 errout:
 173         return 1;
 174 }
 175 EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill);
 176
 177 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
 178                       struct sk_buff *skb, const struct inet_diag_req_v2 *req,
 179                       struct user_namespace *user_ns,
 180                       u32 portid, u32 seq, u16 nlmsg_flags,
 181                       const struct nlmsghdr *unlh,
 182                       bool net_admin)
 183 {
 184         const struct tcp_congestion_ops *ca_ops;
 185         const struct inet_diag_handler *handler;
 186         int ext = req->idiag_ext;
 187         struct inet_diag_msg *r;
 188         struct nlmsghdr  *nlh;
 189         struct nlattr *attr;
 190         void *info = NULL;
 191
 192         handler = inet_diag_table[req->sdiag_protocol];
 193         BUG_ON(!handler);
 194
 195         nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
 196                         nlmsg_flags);
 197         if (!nlh)
 198                 return -EMSGSIZE;
 199
 200         r = nlmsg_data(nlh);
 201         BUG_ON(!sk_fullsock(sk));
 202
 203         inet_diag_msg_common_fill(r, sk);
 204         r->idiag_state = sk->sk_state;
 205         r->idiag_timer = 0;
 206         r->idiag_retrans = 0;
 207
 208         if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns, net_admin))
 209                 goto errout;
 210
 211         if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
 212                 struct inet_diag_meminfo minfo = {
 213                         .idiag_rmem = sk_rmem_alloc_get(sk),
 214                         .idiag_wmem = sk->sk_wmem_queued,
 215                         .idiag_fmem = sk->sk_forward_alloc,
 216                         .idiag_tmem = sk_wmem_alloc_get(sk),
 217                 };
 218
 219                 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
 220                         goto errout;
 221         }
 222
 223         if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
 224                 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
 225                         goto errout;
 226
 227         /*
 228          * RAW sockets might have user-defined protocols assigned,
 229          * so report the one supplied on socket creation.
 230          */
 231         if (sk->sk_type == SOCK_RAW) {
 232                 if (nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))
 233                         goto errout;
 234         }
 235
 236         if (!icsk) {
 237                 handler->idiag_get_info(sk, r, NULL);
 238                 goto out;
 239         }
 240
 241         if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
 242             icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT ||
 243             icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
 244                 r->idiag_timer = 1;
 245                 r->idiag_retrans = icsk->icsk_retransmits;
 246                 r->idiag_expires =
 247                         jiffies_to_msecs(icsk->icsk_timeout - jiffies);
 248         } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
 249                 r->idiag_timer = 4;
 250                 r->idiag_retrans = icsk->icsk_probes_out;
 251                 r->idiag_expires =
 252                         jiffies_to_msecs(icsk->icsk_timeout - jiffies);
 253         } else if (timer_pending(&sk->sk_timer)) {
 254                 r->idiag_timer = 2;
 255                 r->idiag_retrans = icsk->icsk_probes_out;
 256                 r->idiag_expires =
 257                         jiffies_to_msecs(sk->sk_timer.expires - jiffies);
 258         } else {
 259                 r->idiag_timer = 0;
 260                 r->idiag_expires = 0;
 261         }
 262
 263         if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
 264                 attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
 265                                          handler->idiag_info_size,
 266                                          INET_DIAG_PAD);
 267                 if (!attr)
 268                         goto errout;
 269
 270                 info = nla_data(attr);
 271         }
 272
 273         if (ext & (1 << (INET_DIAG_CONG - 1))) {
 274                 int err = 0;
 275
 276                 rcu_read_lock();
 277                 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
 278                 if (ca_ops)
 279                         err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
 280                 rcu_read_unlock();
 281                 if (err < 0)
 282                         goto errout;
 283         }
 284
 285         handler->idiag_get_info(sk, r, info);
 286
 287         if (ext & (1 << (INET_DIAG_INFO - 1)) && handler->idiag_get_aux)
 288                 if (handler->idiag_get_aux(sk, net_admin, skb) < 0)
 289                         goto errout;
 290
 291         if (sk->sk_state < TCP_TIME_WAIT) {
 292                 union tcp_cc_info info;
 293                 size_t sz = 0;
 294                 int attr;
 295
 296                 rcu_read_lock();
 297                 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
 298                 if (ca_ops && ca_ops->get_info)
 299                         sz = ca_ops->get_info(sk, ext, &attr, &info);
 300                 rcu_read_unlock();
 301                 if (sz && nla_put(skb, attr, sz, &info) < 0)
 302                         goto errout;
 303         }
 304
 305 out:
 306         nlmsg_end(skb, nlh);
 307         return 0;
 308
 309 errout:
 310         nlmsg_cancel(skb, nlh);
 311         return -EMSGSIZE;
 312 }
 313 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
 314
 315 static int inet_csk_diag_fill(struct sock *sk,
 316                               struct sk_buff *skb,
 317                               const struct inet_diag_req_v2 *req,
 318                               struct user_namespace *user_ns,
 319                               u32 portid, u32 seq, u16 nlmsg_flags,
 320                               const struct nlmsghdr *unlh,
 321                               bool net_admin)
 322 {
 323         return inet_sk_diag_fill(sk, inet_csk(sk), skb, req, user_ns,
 324                                  portid, seq, nlmsg_flags, unlh, net_admin);
 325 }
 326
 327 static int inet_twsk_diag_fill(struct sock *sk,
 328                                struct sk_buff *skb,
 329                                u32 portid, u32 seq, u16 nlmsg_flags,
 330                                const struct nlmsghdr *unlh)
 331 {
 332         struct inet_timewait_sock *tw = inet_twsk(sk);
 333         struct inet_diag_msg *r;
 334         struct nlmsghdr *nlh;
 335         long tmo;
 336
 337         nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
 338                         nlmsg_flags);
 339         if (!nlh)
 340                 return -EMSGSIZE;
 341
 342         r = nlmsg_data(nlh);
 343         BUG_ON(tw->tw_state != TCP_TIME_WAIT);
 344
 345         tmo = tw->tw_timer.expires - jiffies;
 346         if (tmo < 0)
 347                 tmo = 0;
 348
 349         inet_diag_msg_common_fill(r, sk);
 350         r->idiag_retrans      = 0;
 351
 352         r->idiag_state        = tw->tw_substate;
 353         r->idiag_timer        = 3;
 354         r->idiag_expires      = jiffies_to_msecs(tmo);
 355         r->idiag_rqueue       = 0;
 356         r->idiag_wqueue       = 0;
 357         r->idiag_uid          = 0;
 358         r->idiag_inode        = 0;
 359
 360         nlmsg_end(skb, nlh);
 361         return 0;
 362 }
 363
 364 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
 365                               u32 portid, u32 seq, u16 nlmsg_flags,
 366                               const struct nlmsghdr *unlh, bool net_admin)
 367 {
 368         struct request_sock *reqsk = inet_reqsk(sk);
 369         struct inet_diag_msg *r;
 370         struct nlmsghdr *nlh;
 371         long tmo;
 372
 373         nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
 374                         nlmsg_flags);
 375         if (!nlh)
 376                 return -EMSGSIZE;
 377
 378         r = nlmsg_data(nlh);
 379         inet_diag_msg_common_fill(r, sk);
 380         r->idiag_state = TCP_SYN_RECV;
 381         r->idiag_timer = 1;
 382         r->idiag_retrans = reqsk->num_retrans;
 383
 384         BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
 385                      offsetof(struct sock, sk_cookie));
 386
 387         tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
 388         r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0;
 389         r->idiag_rqueue = 0;
 390         r->idiag_wqueue = 0;
 391         r->idiag_uid    = 0;
 392         r->idiag_inode  = 0;
 393
 394         if (net_admin && nla_put_u32(skb, INET_DIAG_MARK,
 395                                      inet_rsk(reqsk)->ir_mark)) {
 396                 nlmsg_cancel(skb, nlh);
 397                 return -EMSGSIZE;
 398         }
 399
 400         nlmsg_end(skb, nlh);
 401         return 0;
 402 }
 403
 404 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
 405                         const struct inet_diag_req_v2 *r,
 406                         struct user_namespace *user_ns,
 407                         u32 portid, u32 seq, u16 nlmsg_flags,
 408                         const struct nlmsghdr *unlh, bool net_admin)
 409 {
 410         if (sk->sk_state == TCP_TIME_WAIT)
 411                 return inet_twsk_diag_fill(sk, skb, portid, seq,
 412                                            nlmsg_flags, unlh);
 413
 414         if (sk->sk_state == TCP_NEW_SYN_RECV)
 415                 return inet_req_diag_fill(sk, skb, portid, seq,
 416                                           nlmsg_flags, unlh, net_admin);
 417
 418         return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
 419                                   nlmsg_flags, unlh, net_admin);
 420 }
 421
 422 struct sock *inet_diag_find_one_icsk(struct net *net,
 423                                      struct inet_hashinfo *hashinfo,
 424                                      const struct inet_diag_req_v2 *req)
 425 {
 426         struct sock *sk;
 427
 428         rcu_read_lock();
 429         if (req->sdiag_family == AF_INET)
 430                 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
 431                                  req->id.idiag_dport, req->id.idiag_src[0],
 432                                  req->id.idiag_sport, req->id.idiag_if);
 433 #if IS_ENABLED(CONFIG_IPV6)
 434         else if (req->sdiag_family == AF_INET6) {
 435                 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
 436                     ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
 437                         sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
 438                                          req->id.idiag_dport, req->id.idiag_src[3],
 439                                          req->id.idiag_sport, req->id.idiag_if);
 440                 else
 441                         sk = inet6_lookup(net, hashinfo, NULL, 0,
 442                                           (struct in6_addr *)req->id.idiag_dst,
 443                                           req->id.idiag_dport,
 444                                           (struct in6_addr *)req->id.idiag_src,
 445                                           req->id.idiag_sport,
 446                                           req->id.idiag_if);
 447         }
 448 #endif
 449         else {
 450                 rcu_read_unlock();
 451                 return ERR_PTR(-EINVAL);
 452         }
 453         rcu_read_unlock();
 454         if (!sk)
 455                 return ERR_PTR(-ENOENT);
 456
 457         if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
 458                 sock_gen_put(sk);
 459                 return ERR_PTR(-ENOENT);
 460         }
 461
 462         return sk;
 463 }
 464 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
 465
 466 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
 467                             struct sk_buff *in_skb,
 468                             const struct nlmsghdr *nlh,
 469                             const struct inet_diag_req_v2 *req)
 470 {
 471         bool net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN);
 472         struct net *net = sock_net(in_skb->sk);
 473         struct sk_buff *rep;
 474         struct sock *sk;
 475         int err;
 476
 477         sk = inet_diag_find_one_icsk(net, hashinfo, req);
 478         if (IS_ERR(sk))
 479                 return PTR_ERR(sk);
 480
 481         rep = nlmsg_new(inet_sk_attr_size(sk, req, net_admin), GFP_KERNEL);
 482         if (!rep) {
 483                 err = -ENOMEM;
 484                 goto out;
 485         }
 486
 487         err = sk_diag_fill(sk, rep, req,
 488                            sk_user_ns(NETLINK_CB(in_skb).sk),
 489                            NETLINK_CB(in_skb).portid,
 490                            nlh->nlmsg_seq, 0, nlh, net_admin);
 491         if (err < 0) {
 492                 WARN_ON(err == -EMSGSIZE);
 493                 nlmsg_free(rep);
 494                 goto out;
 495         }
 496         err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
 497                               MSG_DONTWAIT);
 498         if (err > 0)
 499                 err = 0;
 500
 501 out:
 502         if (sk)
 503                 sock_gen_put(sk);
 504
 505         return err;
 506 }
 507 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
 508
 509 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
 510                                const struct nlmsghdr *nlh,
 511                                const struct inet_diag_req_v2 *req)
 512 {
 513         const struct inet_diag_handler *handler;
 514         int err;
 515
 516         handler = inet_diag_lock_handler(req->sdiag_protocol);
 517         if (IS_ERR(handler))
 518                 err = PTR_ERR(handler);
 519         else if (cmd == SOCK_DIAG_BY_FAMILY)
 520                 err = handler->dump_one(in_skb, nlh, req);
 521         else if (cmd == SOCK_DESTROY && handler->destroy)
 522                 err = handler->destroy(in_skb, req);
 523         else
 524                 err = -EOPNOTSUPP;
 525         inet_diag_unlock_handler(handler);
 526
 527         return err;
 528 }
 529
 530 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
 531 {
 532         int words = bits >> 5;
 533
 534         bits &= 0x1f;
 535
 536         if (words) {
 537                 if (memcmp(a1, a2, words << 2))
 538                         return 0;
 539         }
 540         if (bits) {
 541                 __be32 w1, w2;
 542                 __be32 mask;
 543
 544                 w1 = a1[words];
 545                 w2 = a2[words];
 546
 547                 mask = htonl((0xffffffff) << (32 - bits));
 548
 549                 if ((w1 ^ w2) & mask)
 550                         return 0;
 551         }
 552
 553         return 1;
 554 }
 555
 556 static int inet_diag_bc_run(const struct nlattr *_bc,
 557                             const struct inet_diag_entry *entry)
 558 {
 559         const void *bc = nla_data(_bc);
 560         int len = nla_len(_bc);
 561
 562         while (len > 0) {
 563                 int yes = 1;
 564                 const struct inet_diag_bc_op *op = bc;
 565
 566                 switch (op->code) {
 567                 case INET_DIAG_BC_NOP:
 568                         break;
 569                 case INET_DIAG_BC_JMP:
 570                         yes = 0;
 571                         break;
 572                 case INET_DIAG_BC_S_EQ:
 573                         yes = entry->sport == op[1].no;
 574                         break;
 575                 case INET_DIAG_BC_S_GE:
 576                         yes = entry->sport >= op[1].no;
 577                         break;
 578                 case INET_DIAG_BC_S_LE:
 579                         yes = entry->sport <= op[1].no;
 580                         break;
 581                 case INET_DIAG_BC_D_EQ:
 582                         yes = entry->dport == op[1].no;
 583                         break;
 584                 case INET_DIAG_BC_D_GE:
 585                         yes = entry->dport >= op[1].no;
 586                         break;
 587                 case INET_DIAG_BC_D_LE:
 588                         yes = entry->dport <= op[1].no;
 589                         break;
 590                 case INET_DIAG_BC_AUTO:
 591                         yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
 592                         break;
 593                 case INET_DIAG_BC_S_COND:
 594                 case INET_DIAG_BC_D_COND: {
 595                         const struct inet_diag_hostcond *cond;
 596                         const __be32 *addr;
 597
 598                         cond = (const struct inet_diag_hostcond *)(op + 1);
 599                         if (cond->port != -1 &&
 600                             cond->port != (op->code == INET_DIAG_BC_S_COND ?
 601                                              entry->sport : entry->dport)) {
 602                                 yes = 0;
 603                                 break;
 604                         }
 605
 606                         if (op->code == INET_DIAG_BC_S_COND)
 607                                 addr = entry->saddr;
 608                         else
 609                                 addr = entry->daddr;
 610
 611                         if (cond->family != AF_UNSPEC &&
 612                             cond->family != entry->family) {
 613                                 if (entry->family == AF_INET6 &&
 614                                     cond->family == AF_INET) {
 615                                         if (addr[0] == 0 && addr[1] == 0 &&
 616                                             addr[2] == htonl(0xffff) &&
 617                                             bitstring_match(addr + 3,
 618                                                             cond->addr,
 619                                                             cond->prefix_len))
 620                                                 break;
 621                                 }
 622                                 yes = 0;
 623                                 break;
 624                         }
 625
 626                         if (cond->prefix_len == 0)
 627                                 break;
 628                         if (bitstring_match(addr, cond->addr,
 629                                             cond->prefix_len))
 630                                 break;
 631                         yes = 0;
 632                         break;
 633                 }
 634                 case INET_DIAG_BC_DEV_COND: {
 635                         u32 ifindex;
 636
 637                         ifindex = *((const u32 *)(op + 1));
 638                         if (ifindex != entry->ifindex)
 639                                 yes = 0;
 640                         break;
 641                 }
 642                 case INET_DIAG_BC_MARK_COND: {
 643                         struct inet_diag_markcond *cond;
 644
 645                         cond = (struct inet_diag_markcond *)(op + 1);
 646                         if ((entry->mark & cond->mask) != cond->mark)
 647                                 yes = 0;
 648                         break;
 649                 }
 650                 }
 651
 652                 if (yes) {
 653                         len -= op->yes;
 654                         bc += op->yes;
 655                 } else {
 656                         len -= op->no;
 657                         bc += op->no;
 658                 }
 659         }
 660         return len == 0;
 661 }
 662
 663 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
 664  */
 665 static void entry_fill_addrs(struct inet_diag_entry *entry,
 666                              const struct sock *sk)
 667 {
 668 #if IS_ENABLED(CONFIG_IPV6)
 669         if (sk->sk_family == AF_INET6) {
 670                 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
 671                 entry->daddr = sk->sk_v6_daddr.s6_addr32;
 672         } else
 673 #endif
 674         {
 675                 entry->saddr = &sk->sk_rcv_saddr;
 676                 entry->daddr = &sk->sk_daddr;
 677         }
 678 }
 679
 680 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
 681 {
 682         struct inet_sock *inet = inet_sk(sk);
 683         struct inet_diag_entry entry;
 684
 685         if (!bc)
 686                 return 1;
 687
 688         entry.family = sk->sk_family;
 689         entry_fill_addrs(&entry, sk);
 690         entry.sport = inet->inet_num;
 691         entry.dport = ntohs(inet->inet_dport);
 692         entry.ifindex = sk->sk_bound_dev_if;
 693         entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
 694         if (sk_fullsock(sk))
 695                 entry.mark = sk->sk_mark;
 696         else if (sk->sk_state == TCP_NEW_SYN_RECV)
 697                 entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark;
 698         else
 699                 entry.mark = 0;
 700
 701         return inet_diag_bc_run(bc, &entry);
 702 }
 703 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
 704
 705 static int valid_cc(const void *bc, int len, int cc)
 706 {
 707         while (len >= 0) {
 708                 const struct inet_diag_bc_op *op = bc;
 709
 710                 if (cc > len)
 711                         return 0;
 712                 if (cc == len)
 713                         return 1;
 714                 if (op->yes < 4 || op->yes & 3)
 715                         return 0;
 716                 len -= op->yes;
 717                 bc  += op->yes;
 718         }
 719         return 0;
 720 }
 721
 722 /* data is u32 ifindex */
 723 static bool valid_devcond(const struct inet_diag_bc_op *op, int len,
 724                           int *min_len)
 725 {
 726         /* Check ifindex space. */
 727         *min_len += sizeof(u32);
 728         if (len < *min_len)
 729                 return false;
 730
 731         return true;
 732 }
 733 /* Validate an inet_diag_hostcond. */
 734 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
 735                            int *min_len)
 736 {
 737         struct inet_diag_hostcond *cond;
 738         int addr_len;
 739
 740         /* Check hostcond space. */
 741         *min_len += sizeof(struct inet_diag_hostcond);
 742         if (len < *min_len)
 743                 return false;
 744         cond = (struct inet_diag_hostcond *)(op + 1);
 745
 746         /* Check address family and address length. */
 747         switch (cond->family) {
 748         case AF_UNSPEC:
 749                 addr_len = 0;
 750                 break;
 751         case AF_INET:
 752                 addr_len = sizeof(struct in_addr);
 753                 break;
 754         case AF_INET6:
 755                 addr_len = sizeof(struct in6_addr);
 756                 break;
 757         default:
 758                 return false;
 759         }
 760         *min_len += addr_len;
 761         if (len < *min_len)
 762                 return false;
 763
 764         /* Check prefix length (in bits) vs address length (in bytes). */
 765         if (cond->prefix_len > 8 * addr_len)
 766                 return false;
 767
 768         return true;
 769 }
 770
 771 /* Validate a port comparison operator. */
 772 static bool valid_port_comparison(const struct inet_diag_bc_op *op,
 773                                   int len, int *min_len)
 774 {
 775         /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
 776         *min_len += sizeof(struct inet_diag_bc_op);
 777         if (len < *min_len)
 778                 return false;
 779         return true;
 780 }
 781
 782 static bool valid_markcond(const struct inet_diag_bc_op *op, int len,
 783                            int *min_len)
 784 {
 785         *min_len += sizeof(struct inet_diag_markcond);
 786         return len >= *min_len;
 787 }
 788
 789 static int inet_diag_bc_audit(const struct nlattr *attr,
 790                               const struct sk_buff *skb)
 791 {
 792         bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN);
 793         const void *bytecode, *bc;
 794         int bytecode_len, len;
 795
 796         if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op))
 797                 return -EINVAL;
 798
 799         bytecode = bc = nla_data(attr);
 800         len = bytecode_len = nla_len(attr);
 801
 802         while (len > 0) {
 803                 int min_len = sizeof(struct inet_diag_bc_op);
 804                 const struct inet_diag_bc_op *op = bc;
 805
 806                 switch (op->code) {
 807                 case INET_DIAG_BC_S_COND:
 808                 case INET_DIAG_BC_D_COND:
 809                         if (!valid_hostcond(bc, len, &min_len))
 810                                 return -EINVAL;
 811                         break;
 812                 case INET_DIAG_BC_DEV_COND:
 813                         if (!valid_devcond(bc, len, &min_len))
 814                                 return -EINVAL;
 815                         break;
 816                 case INET_DIAG_BC_S_EQ:
 817                 case INET_DIAG_BC_S_GE:
 818                 case INET_DIAG_BC_S_LE:
 819                 case INET_DIAG_BC_D_EQ:
 820                 case INET_DIAG_BC_D_GE:
 821                 case INET_DIAG_BC_D_LE:
 822                         if (!valid_port_comparison(bc, len, &min_len))
 823                                 return -EINVAL;
 824                         break;
 825                 case INET_DIAG_BC_MARK_COND:
 826                         if (!net_admin)
 827                                 return -EPERM;
 828                         if (!valid_markcond(bc, len, &min_len))
 829                                 return -EINVAL;
 830                         break;
 831                 case INET_DIAG_BC_AUTO:
 832                 case INET_DIAG_BC_JMP:
 833                 case INET_DIAG_BC_NOP:
 834                         break;
 835                 default:
 836                         return -EINVAL;
 837                 }
 838
 839                 if (op->code != INET_DIAG_BC_NOP) {
 840                         if (op->no < min_len || op->no > len + 4 || op->no & 3)
 841                                 return -EINVAL;
 842                         if (op->no < len &&
 843                             !valid_cc(bytecode, bytecode_len, len - op->no))
 844                                 return -EINVAL;
 845                 }
 846
 847                 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
 848                         return -EINVAL;
 849                 bc  += op->yes;
 850                 len -= op->yes;
 851         }
 852         return len == 0 ? 0 : -EINVAL;
 853 }
 854
 855 static int inet_csk_diag_dump(struct sock *sk,
 856                               struct sk_buff *skb,
 857                               struct netlink_callback *cb,
 858                               const struct inet_diag_req_v2 *r,
 859                               const struct nlattr *bc,
 860                               bool net_admin)
 861 {
 862         if (!inet_diag_bc_sk(bc, sk))
 863                 return 0;
 864
 865         return inet_csk_diag_fill(sk, skb, r,
 866                                   sk_user_ns(NETLINK_CB(cb->skb).sk),
 867                                   NETLINK_CB(cb->skb).portid,
 868                                   cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh,
 869                                   net_admin);
 870 }
 871
 872 static void twsk_build_assert(void)
 873 {
 874         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
 875                      offsetof(struct sock, sk_family));
 876
 877         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
 878                      offsetof(struct inet_sock, inet_num));
 879
 880         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
 881                      offsetof(struct inet_sock, inet_dport));
 882
 883         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
 884                      offsetof(struct inet_sock, inet_rcv_saddr));
 885
 886         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
 887                      offsetof(struct inet_sock, inet_daddr));
 888
 889 #if IS_ENABLED(CONFIG_IPV6)
 890         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
 891                      offsetof(struct sock, sk_v6_rcv_saddr));
 892
 893         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
 894                      offsetof(struct sock, sk_v6_daddr));
 895 #endif
 896 }
 897
 898 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
 899                          struct netlink_callback *cb,
 900                          const struct inet_diag_req_v2 *r, struct nlattr *bc)
 901 {
 902         bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
 903         struct net *net = sock_net(skb->sk);
 904         u32 idiag_states = r->idiag_states;
 905         int i, num, s_i, s_num;
 906         struct sock *sk;
 907
 908         if (idiag_states & TCPF_SYN_RECV)
 909                 idiag_states |= TCPF_NEW_SYN_RECV;
 910         s_i = cb->args[1];
 911         s_num = num = cb->args[2];
 912
 913         if (cb->args[0] == 0) {
 914                 if (!(idiag_states & TCPF_LISTEN) || r->id.idiag_dport)
 915                         goto skip_listen_ht;
 916
 917                 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
 918                         struct inet_listen_hashbucket *ilb;
 919                         struct hlist_nulls_node *node;
 920
 921                         num = 0;
 922                         ilb = &hashinfo->listening_hash[i];
 923                         spin_lock(&ilb->lock);
 924                         sk_nulls_for_each(sk, node, &ilb->nulls_head) {
 925                                 struct inet_sock *inet = inet_sk(sk);
 926
 927                                 if (!net_eq(sock_net(sk), net))
 928                                         continue;
 929
 930                                 if (num < s_num) {
 931                                         num++;
 932                                         continue;
 933                                 }
 934
 935                                 if (r->sdiag_family != AF_UNSPEC &&
 936                                     sk->sk_family != r->sdiag_family)
 937                                         goto next_listen;
 938
 939                                 if (r->id.idiag_sport != inet->inet_sport &&
 940                                     r->id.idiag_sport)
 941                                         goto next_listen;
 942
 943                                 if (inet_csk_diag_dump(sk, skb, cb, r,
 944                                                        bc, net_admin) < 0) {
 945                                         spin_unlock(&ilb->lock);
 946                                         goto done;
 947                                 }
 948
 949 next_listen:
 950                                 ++num;
 951                         }
 952                         spin_unlock(&ilb->lock);
 953
 954                         s_num = 0;
 955                 }
 956 skip_listen_ht:
 957                 cb->args[0] = 1;
 958                 s_i = num = s_num = 0;
 959         }
 960
 961         if (!(idiag_states & ~TCPF_LISTEN))
 962                 goto out;
 963
 964 #define SKARR_SZ 16
 965         for (i = s_i; i <= hashinfo->ehash_mask; i++) {
 966                 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
 967                 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
 968                 struct hlist_nulls_node *node;
 969                 struct sock *sk_arr[SKARR_SZ];
 970                 int num_arr[SKARR_SZ];
 971                 int idx, accum, res;
 972
 973                 if (hlist_nulls_empty(&head->chain))
 974                         continue;
 975
 976                 if (i > s_i)
 977                         s_num = 0;
 978
 979 next_chunk:
 980                 num = 0;
 981                 accum = 0;
 982                 spin_lock_bh(lock);
 983                 sk_nulls_for_each(sk, node, &head->chain) {
 984                         int state;
 985
 986                         if (!net_eq(sock_net(sk), net))
 987                                 continue;
 988                         if (num < s_num)
 989                                 goto next_normal;
 990                         state = (sk->sk_state == TCP_TIME_WAIT) ?
 991                                 inet_twsk(sk)->tw_substate : sk->sk_state;
 992                         if (!(idiag_states & (1 << state)))
 993                                 goto next_normal;
 994                         if (r->sdiag_family != AF_UNSPEC &&
 995                             sk->sk_family != r->sdiag_family)
 996                                 goto next_normal;
 997                         if (r->id.idiag_sport != htons(sk->sk_num) &&
 998                             r->id.idiag_sport)
 999                                 goto next_normal;
1000                         if (r->id.idiag_dport != sk->sk_dport &&
1001                             r->id.idiag_dport)
1002                                 goto next_normal;
1003                         twsk_build_assert();
1004
1005                         if (!inet_diag_bc_sk(bc, sk))
1006                                 goto next_normal;
1007
1008                         if (!refcount_inc_not_zero(&sk->sk_refcnt))
1009                                 goto next_normal;
1010
1011                         num_arr[accum] = num;
1012                         sk_arr[accum] = sk;
1013                         if (++accum == SKARR_SZ)
1014                                 break;
1015 next_normal:
1016                         ++num;
1017                 }
1018                 spin_unlock_bh(lock);
1019                 res = 0;
1020                 for (idx = 0; idx < accum; idx++) {
1021                         if (res >= 0) {
1022                                 res = sk_diag_fill(sk_arr[idx], skb, r,
1023                                            sk_user_ns(NETLINK_CB(cb->skb).sk),
1024                                            NETLINK_CB(cb->skb).portid,
1025                                            cb->nlh->nlmsg_seq, NLM_F_MULTI,
1026                                            cb->nlh, net_admin);
1027                                 if (res < 0)
1028                                         num = num_arr[idx];
1029                         }
1030                         sock_gen_put(sk_arr[idx]);
1031                 }
1032                 if (res < 0)
1033                         break;
1034                 cond_resched();
1035                 if (accum == SKARR_SZ) {
1036                         s_num = num + 1;
1037                         goto next_chunk;
1038                 }
1039         }
1040
1041 done:
1042         cb->args[1] = i;
1043         cb->args[2] = num;
1044 out:
1045         ;
1046 }
1047 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
1048
1049 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
1050                             const struct inet_diag_req_v2 *r,
1051                             struct nlattr *bc)
1052 {
1053         const struct inet_diag_handler *handler;
1054         int err = 0;
1055
1056         handler = inet_diag_lock_handler(r->sdiag_protocol);
1057         if (!IS_ERR(handler))
1058                 handler->dump(skb, cb, r, bc);
1059         else
1060                 err = PTR_ERR(handler);
1061         inet_diag_unlock_handler(handler);
1062
1063         return err ? : skb->len;
1064 }
1065
1066 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
1067 {
1068         int hdrlen = sizeof(struct inet_diag_req_v2);
1069         struct nlattr *bc = NULL;
1070
1071         if (nlmsg_attrlen(cb->nlh, hdrlen))
1072                 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1073
1074         return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
1075 }
1076
1077 static int inet_diag_type2proto(int type)
1078 {
1079         switch (type) {
1080         case TCPDIAG_GETSOCK:
1081                 return IPPROTO_TCP;
1082         case DCCPDIAG_GETSOCK:
1083                 return IPPROTO_DCCP;
1084         default:
1085                 return 0;
1086         }
1087 }
1088
1089 static int inet_diag_dump_compat(struct sk_buff *skb,
1090                                  struct netlink_callback *cb)
1091 {
1092         struct inet_diag_req *rc = nlmsg_data(cb->nlh);
1093         int hdrlen = sizeof(struct inet_diag_req);
1094         struct inet_diag_req_v2 req;
1095         struct nlattr *bc = NULL;
1096
1097         req.sdiag_family = AF_UNSPEC; /* compatibility */
1098         req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1099         req.idiag_ext = rc->idiag_ext;
1100         req.idiag_states = rc->idiag_states;
1101         req.id = rc->id;
1102
1103         if (nlmsg_attrlen(cb->nlh, hdrlen))
1104                 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1105
1106         return __inet_diag_dump(skb, cb, &req, bc);
1107 }
1108
1109 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1110                                       const struct nlmsghdr *nlh)
1111 {
1112         struct inet_diag_req *rc = nlmsg_data(nlh);
1113         struct inet_diag_req_v2 req;
1114
1115         req.sdiag_family = rc->idiag_family;
1116         req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1117         req.idiag_ext = rc->idiag_ext;
1118         req.idiag_states = rc->idiag_states;
1119         req.id = rc->id;
1120
1121         return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req);
1122 }
1123
1124 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1125 {
1126         int hdrlen = sizeof(struct inet_diag_req);
1127         struct net *net = sock_net(skb->sk);
1128
1129         if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1130             nlmsg_len(nlh) < hdrlen)
1131                 return -EINVAL;
1132
1133         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1134                 if (nlmsg_attrlen(nlh, hdrlen)) {
1135                         struct nlattr *attr;
1136                         int err;
1137
1138                         attr = nlmsg_find_attr(nlh, hdrlen,
1139                                                INET_DIAG_REQ_BYTECODE);
1140                         err = inet_diag_bc_audit(attr, skb);
1141                         if (err)
1142                                 return err;
1143                 }
1144                 {
1145                         struct netlink_dump_control c = {
1146                                 .dump = inet_diag_dump_compat,
1147                         };
1148                         return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1149                 }
1150         }
1151
1152         return inet_diag_get_exact_compat(skb, nlh);
1153 }
1154
1155 static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
1156 {
1157         int hdrlen = sizeof(struct inet_diag_req_v2);
1158         struct net *net = sock_net(skb->sk);
1159
1160         if (nlmsg_len(h) < hdrlen)
1161                 return -EINVAL;
1162
1163         if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1164             h->nlmsg_flags & NLM_F_DUMP) {
1165                 if (nlmsg_attrlen(h, hdrlen)) {
1166                         struct nlattr *attr;
1167                         int err;
1168
1169                         attr = nlmsg_find_attr(h, hdrlen,
1170                                                INET_DIAG_REQ_BYTECODE);
1171                         err = inet_diag_bc_audit(attr, skb);
1172                         if (err)
1173                                 return err;
1174                 }
1175                 {
1176                         struct netlink_dump_control c = {
1177                                 .dump = inet_diag_dump,
1178                         };
1179                         return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1180                 }
1181         }
1182
1183         return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h));
1184 }
1185
1186 static
1187 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1188 {
1189         const struct inet_diag_handler *handler;
1190         struct nlmsghdr *nlh;
1191         struct nlattr *attr;
1192         struct inet_diag_msg *r;
1193         void *info = NULL;
1194         int err = 0;
1195
1196         nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1197         if (!nlh)
1198                 return -ENOMEM;
1199
1200         r = nlmsg_data(nlh);
1201         memset(r, 0, sizeof(*r));
1202         inet_diag_msg_common_fill(r, sk);
1203         if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1204                 r->id.idiag_sport = inet_sk(sk)->inet_sport;
1205         r->idiag_state = sk->sk_state;
1206
1207         if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1208                 nlmsg_cancel(skb, nlh);
1209                 return err;
1210         }
1211
1212         handler = inet_diag_lock_handler(sk->sk_protocol);
1213         if (IS_ERR(handler)) {
1214                 inet_diag_unlock_handler(handler);
1215                 nlmsg_cancel(skb, nlh);
1216                 return PTR_ERR(handler);
1217         }
1218
1219         attr = handler->idiag_info_size
1220                 ? nla_reserve_64bit(skb, INET_DIAG_INFO,
1221                                     handler->idiag_info_size,
1222                                     INET_DIAG_PAD)
1223                 : NULL;
1224         if (attr)
1225                 info = nla_data(attr);
1226
1227         handler->idiag_get_info(sk, r, info);
1228         inet_diag_unlock_handler(handler);
1229
1230         nlmsg_end(skb, nlh);
1231         return 0;
1232 }
1233
1234 static const struct sock_diag_handler inet_diag_handler = {
1235         .family = AF_INET,
1236         .dump = inet_diag_handler_cmd,
1237         .get_info = inet_diag_handler_get_info,
1238         .destroy = inet_diag_handler_cmd,
1239 };
1240
1241 static const struct sock_diag_handler inet6_diag_handler = {
1242         .family = AF_INET6,
1243         .dump = inet_diag_handler_cmd,
1244         .get_info = inet_diag_handler_get_info,
1245         .destroy = inet_diag_handler_cmd,
1246 };
1247
1248 int inet_diag_register(const struct inet_diag_handler *h)
1249 {
1250         const __u16 type = h->idiag_type;
1251         int err = -EINVAL;
1252
1253         if (type >= IPPROTO_MAX)
1254                 goto out;
1255
1256         mutex_lock(&inet_diag_table_mutex);
1257         err = -EEXIST;
1258         if (!inet_diag_table[type]) {
1259                 inet_diag_table[type] = h;
1260                 err = 0;
1261         }
1262         mutex_unlock(&inet_diag_table_mutex);
1263 out:
1264         return err;
1265 }
1266 EXPORT_SYMBOL_GPL(inet_diag_register);
1267
1268 void inet_diag_unregister(const struct inet_diag_handler *h)
1269 {
1270         const __u16 type = h->idiag_type;
1271
1272         if (type >= IPPROTO_MAX)
1273                 return;
1274
1275         mutex_lock(&inet_diag_table_mutex);
1276         inet_diag_table[type] = NULL;
1277         mutex_unlock(&inet_diag_table_mutex);
1278 }
1279 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1280
1281 static int __init inet_diag_init(void)
1282 {
1283         const int inet_diag_table_size = (IPPROTO_MAX *
1284                                           sizeof(struct inet_diag_handler *));
1285         int err = -ENOMEM;
1286
1287         inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1288         if (!inet_diag_table)
1289                 goto out;
1290
1291         err = sock_diag_register(&inet_diag_handler);
1292         if (err)
1293                 goto out_free_nl;
1294
1295         err = sock_diag_register(&inet6_diag_handler);
1296         if (err)
1297                 goto out_free_inet;
1298
1299         sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1300 out:
1301         return err;
1302
1303 out_free_inet:
1304         sock_diag_unregister(&inet_diag_handler);
1305 out_free_nl:
1306         kfree(inet_diag_table);
1307         goto out;
1308 }
1309
1310 static void __exit inet_diag_exit(void)
1311 {
1312         sock_diag_unregister(&inet6_diag_handler);
1313         sock_diag_unregister(&inet_diag_handler);
1314         sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1315         kfree(inet_diag_table);
1316 }
1317
1318 module_init(inet_diag_init);
1319 module_exit(inet_diag_exit);
1320 MODULE_LICENSE("GPL");
1321 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1322 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);