net/ipv4/inet_diag.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * inet_diag.c  Module for monitoring INET transport protocols sockets.
   4  *
   5  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/module.h>
  10 #include <linux/types.h>
  11 #include <linux/fcntl.h>
  12 #include <linux/random.h>
  13 #include <linux/slab.h>
  14 #include <linux/cache.h>
  15 #include <linux/init.h>
  16 #include <linux/time.h>
  17
  18 #include <net/icmp.h>
  19 #include <net/tcp.h>
  20 #include <net/ipv6.h>
  21 #include <net/inet_common.h>
  22 #include <net/inet_connection_sock.h>
  23 #include <net/inet_hashtables.h>
  24 #include <net/inet_timewait_sock.h>
  25 #include <net/inet6_hashtables.h>
  26 #include <net/netlink.h>
  27
  28 #include <linux/inet.h>
  29 #include <linux/stddef.h>
  30
  31 #include <linux/inet_diag.h>
  32 #include <linux/sock_diag.h>
  33
  34 static const struct inet_diag_handler **inet_diag_table;
  35
  36 struct inet_diag_entry {
  37         const __be32 *saddr;
  38         const __be32 *daddr;
  39         u16 sport;
  40         u16 dport;
  41         u16 family;
  42         u16 userlocks;
  43         u32 ifindex;
  44         u32 mark;
  45 };
  46
  47 static DEFINE_MUTEX(inet_diag_table_mutex);
  48
  49 static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
  50 {
  51         if (!inet_diag_table[proto])
  52                 sock_load_diag_module(AF_INET, proto);
  53
  54         mutex_lock(&inet_diag_table_mutex);
  55         if (!inet_diag_table[proto])
  56                 return ERR_PTR(-ENOENT);
  57
  58         return inet_diag_table[proto];
  59 }
  60
  61 static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
  62 {
  63         mutex_unlock(&inet_diag_table_mutex);
  64 }
  65
  66 void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk)
  67 {
  68         r->idiag_family = sk->sk_family;
  69
  70         r->id.idiag_sport = htons(sk->sk_num);
  71         r->id.idiag_dport = sk->sk_dport;
  72         r->id.idiag_if = sk->sk_bound_dev_if;
  73         sock_diag_save_cookie(sk, r->id.idiag_cookie);
  74
  75 #if IS_ENABLED(CONFIG_IPV6)
  76         if (sk->sk_family == AF_INET6) {
  77                 *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
  78                 *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
  79         } else
  80 #endif
  81         {
  82         memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
  83         memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
  84
  85         r->id.idiag_src[0] = sk->sk_rcv_saddr;
  86         r->id.idiag_dst[0] = sk->sk_daddr;
  87         }
  88 }
  89 EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill);
  90
  91 static size_t inet_sk_attr_size(struct sock *sk,
  92                                 const struct inet_diag_req_v2 *req,
  93                                 bool net_admin)
  94 {
  95         const struct inet_diag_handler *handler;
  96         size_t aux = 0;
  97
  98         handler = inet_diag_table[req->sdiag_protocol];
  99         if (handler && handler->idiag_get_aux_size)
 100                 aux = handler->idiag_get_aux_size(sk, net_admin);
 101
 102         return    nla_total_size(sizeof(struct tcp_info))
 103                 + nla_total_size(1) /* INET_DIAG_SHUTDOWN */
 104                 + nla_total_size(1) /* INET_DIAG_TOS */
 105                 + nla_total_size(1) /* INET_DIAG_TCLASS */
 106                 + nla_total_size(4) /* INET_DIAG_MARK */
 107                 + nla_total_size(4) /* INET_DIAG_CLASS_ID */
 108                 + nla_total_size(sizeof(struct inet_diag_meminfo))
 109                 + nla_total_size(sizeof(struct inet_diag_msg))
 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         r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
 151         r->idiag_inode = sock_i_ino(sk);
 152
 153         return 0;
 154 errout:
 155         return 1;
 156 }
 157 EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill);
 158
 159 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
 160                       struct sk_buff *skb, const struct inet_diag_req_v2 *req,
 161                       struct user_namespace *user_ns,
 162                       u32 portid, u32 seq, u16 nlmsg_flags,
 163                       const struct nlmsghdr *unlh,
 164                       bool net_admin)
 165 {
 166         const struct tcp_congestion_ops *ca_ops;
 167         const struct inet_diag_handler *handler;
 168         int ext = req->idiag_ext;
 169         struct inet_diag_msg *r;
 170         struct nlmsghdr  *nlh;
 171         struct nlattr *attr;
 172         void *info = NULL;
 173
 174         handler = inet_diag_table[req->sdiag_protocol];
 175         BUG_ON(!handler);
 176
 177         nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
 178                         nlmsg_flags);
 179         if (!nlh)
 180                 return -EMSGSIZE;
 181
 182         r = nlmsg_data(nlh);
 183         BUG_ON(!sk_fullsock(sk));
 184
 185         inet_diag_msg_common_fill(r, sk);
 186         r->idiag_state = sk->sk_state;
 187         r->idiag_timer = 0;
 188         r->idiag_retrans = 0;
 189
 190         if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns, net_admin))
 191                 goto errout;
 192
 193         if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
 194                 struct inet_diag_meminfo minfo = {
 195                         .idiag_rmem = sk_rmem_alloc_get(sk),
 196                         .idiag_wmem = READ_ONCE(sk->sk_wmem_queued),
 197                         .idiag_fmem = sk->sk_forward_alloc,
 198                         .idiag_tmem = sk_wmem_alloc_get(sk),
 199                 };
 200
 201                 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
 202                         goto errout;
 203         }
 204
 205         if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
 206                 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
 207                         goto errout;
 208
 209         /*
 210          * RAW sockets might have user-defined protocols assigned,
 211          * so report the one supplied on socket creation.
 212          */
 213         if (sk->sk_type == SOCK_RAW) {
 214                 if (nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))
 215                         goto errout;
 216         }
 217
 218         if (!icsk) {
 219                 handler->idiag_get_info(sk, r, NULL);
 220                 goto out;
 221         }
 222
 223         if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
 224             icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT ||
 225             icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
 226                 r->idiag_timer = 1;
 227                 r->idiag_retrans = icsk->icsk_retransmits;
 228                 r->idiag_expires =
 229                         jiffies_to_msecs(icsk->icsk_timeout - jiffies);
 230         } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
 231                 r->idiag_timer = 4;
 232                 r->idiag_retrans = icsk->icsk_probes_out;
 233                 r->idiag_expires =
 234                         jiffies_to_msecs(icsk->icsk_timeout - jiffies);
 235         } else if (timer_pending(&sk->sk_timer)) {
 236                 r->idiag_timer = 2;
 237                 r->idiag_retrans = icsk->icsk_probes_out;
 238                 r->idiag_expires =
 239                         jiffies_to_msecs(sk->sk_timer.expires - jiffies);
 240         } else {
 241                 r->idiag_timer = 0;
 242                 r->idiag_expires = 0;
 243         }
 244
 245         if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
 246                 attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
 247                                          handler->idiag_info_size,
 248                                          INET_DIAG_PAD);
 249                 if (!attr)
 250                         goto errout;
 251
 252                 info = nla_data(attr);
 253         }
 254
 255         if (ext & (1 << (INET_DIAG_CONG - 1))) {
 256                 int err = 0;
 257
 258                 rcu_read_lock();
 259                 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
 260                 if (ca_ops)
 261                         err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
 262                 rcu_read_unlock();
 263                 if (err < 0)
 264                         goto errout;
 265         }
 266
 267         handler->idiag_get_info(sk, r, info);
 268
 269         if (ext & (1 << (INET_DIAG_INFO - 1)) && handler->idiag_get_aux)
 270                 if (handler->idiag_get_aux(sk, net_admin, skb) < 0)
 271                         goto errout;
 272
 273         if (sk->sk_state < TCP_TIME_WAIT) {
 274                 union tcp_cc_info info;
 275                 size_t sz = 0;
 276                 int attr;
 277
 278                 rcu_read_lock();
 279                 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
 280                 if (ca_ops && ca_ops->get_info)
 281                         sz = ca_ops->get_info(sk, ext, &attr, &info);
 282                 rcu_read_unlock();
 283                 if (sz && nla_put(skb, attr, sz, &info) < 0)
 284                         goto errout;
 285         }
 286
 287         if (ext & (1 << (INET_DIAG_CLASS_ID - 1)) ||
 288             ext & (1 << (INET_DIAG_TCLASS - 1))) {
 289                 u32 classid = 0;
 290
 291 #ifdef CONFIG_SOCK_CGROUP_DATA
 292                 classid = sock_cgroup_classid(&sk->sk_cgrp_data);
 293 #endif
 294                 /* Fallback to socket priority if class id isn't set.
 295                  * Classful qdiscs use it as direct reference to class.
 296                  * For cgroup2 classid is always zero.
 297                  */
 298                 if (!classid)
 299                         classid = sk->sk_priority;
 300
 301                 if (nla_put_u32(skb, INET_DIAG_CLASS_ID, classid))
 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                 return -EMSGSIZE;
 397
 398         nlmsg_end(skb, nlh);
 399         return 0;
 400 }
 401
 402 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
 403                         const struct inet_diag_req_v2 *r,
 404                         struct user_namespace *user_ns,
 405                         u32 portid, u32 seq, u16 nlmsg_flags,
 406                         const struct nlmsghdr *unlh, bool net_admin)
 407 {
 408         if (sk->sk_state == TCP_TIME_WAIT)
 409                 return inet_twsk_diag_fill(sk, skb, portid, seq,
 410                                            nlmsg_flags, unlh);
 411
 412         if (sk->sk_state == TCP_NEW_SYN_RECV)
 413                 return inet_req_diag_fill(sk, skb, portid, seq,
 414                                           nlmsg_flags, unlh, net_admin);
 415
 416         return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
 417                                   nlmsg_flags, unlh, net_admin);
 418 }
 419
 420 struct sock *inet_diag_find_one_icsk(struct net *net,
 421                                      struct inet_hashinfo *hashinfo,
 422                                      const struct inet_diag_req_v2 *req)
 423 {
 424         struct sock *sk;
 425
 426         rcu_read_lock();
 427         if (req->sdiag_family == AF_INET)
 428                 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
 429                                  req->id.idiag_dport, req->id.idiag_src[0],
 430                                  req->id.idiag_sport, req->id.idiag_if);
 431 #if IS_ENABLED(CONFIG_IPV6)
 432         else if (req->sdiag_family == AF_INET6) {
 433                 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
 434                     ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
 435                         sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
 436                                          req->id.idiag_dport, req->id.idiag_src[3],
 437                                          req->id.idiag_sport, req->id.idiag_if);
 438                 else
 439                         sk = inet6_lookup(net, hashinfo, NULL, 0,
 440                                           (struct in6_addr *)req->id.idiag_dst,
 441                                           req->id.idiag_dport,
 442                                           (struct in6_addr *)req->id.idiag_src,
 443                                           req->id.idiag_sport,
 444                                           req->id.idiag_if);
 445         }
 446 #endif
 447         else {
 448                 rcu_read_unlock();
 449                 return ERR_PTR(-EINVAL);
 450         }
 451         rcu_read_unlock();
 452         if (!sk)
 453                 return ERR_PTR(-ENOENT);
 454
 455         if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
 456                 sock_gen_put(sk);
 457                 return ERR_PTR(-ENOENT);
 458         }
 459
 460         return sk;
 461 }
 462 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
 463
 464 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
 465                             struct sk_buff *in_skb,
 466                             const struct nlmsghdr *nlh,
 467                             const struct inet_diag_req_v2 *req)
 468 {
 469         bool net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN);
 470         struct net *net = sock_net(in_skb->sk);
 471         struct sk_buff *rep;
 472         struct sock *sk;
 473         int err;
 474
 475         sk = inet_diag_find_one_icsk(net, hashinfo, req);
 476         if (IS_ERR(sk))
 477                 return PTR_ERR(sk);
 478
 479         rep = nlmsg_new(inet_sk_attr_size(sk, req, net_admin), GFP_KERNEL);
 480         if (!rep) {
 481                 err = -ENOMEM;
 482                 goto out;
 483         }
 484
 485         err = sk_diag_fill(sk, rep, req,
 486                            sk_user_ns(NETLINK_CB(in_skb).sk),
 487                            NETLINK_CB(in_skb).portid,
 488                            nlh->nlmsg_seq, 0, nlh, net_admin);
 489         if (err < 0) {
 490                 WARN_ON(err == -EMSGSIZE);
 491                 nlmsg_free(rep);
 492                 goto out;
 493         }
 494         err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
 495                               MSG_DONTWAIT);
 496         if (err > 0)
 497                 err = 0;
 498
 499 out:
 500         if (sk)
 501                 sock_gen_put(sk);
 502
 503         return err;
 504 }
 505 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
 506
 507 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
 508                                const struct nlmsghdr *nlh,
 509                                const struct inet_diag_req_v2 *req)
 510 {
 511         const struct inet_diag_handler *handler;
 512         int err;
 513
 514         handler = inet_diag_lock_handler(req->sdiag_protocol);
 515         if (IS_ERR(handler))
 516                 err = PTR_ERR(handler);
 517         else if (cmd == SOCK_DIAG_BY_FAMILY)
 518                 err = handler->dump_one(in_skb, nlh, req);
 519         else if (cmd == SOCK_DESTROY && handler->destroy)
 520                 err = handler->destroy(in_skb, req);
 521         else
 522                 err = -EOPNOTSUPP;
 523         inet_diag_unlock_handler(handler);
 524
 525         return err;
 526 }
 527
 528 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
 529 {
 530         int words = bits >> 5;
 531
 532         bits &= 0x1f;
 533
 534         if (words) {
 535                 if (memcmp(a1, a2, words << 2))
 536                         return 0;
 537         }
 538         if (bits) {
 539                 __be32 w1, w2;
 540                 __be32 mask;
 541
 542                 w1 = a1[words];
 543                 w2 = a2[words];
 544
 545                 mask = htonl((0xffffffff) << (32 - bits));
 546
 547                 if ((w1 ^ w2) & mask)
 548                         return 0;
 549         }
 550
 551         return 1;
 552 }
 553
 554 static int inet_diag_bc_run(const struct nlattr *_bc,
 555                             const struct inet_diag_entry *entry)
 556 {
 557         const void *bc = nla_data(_bc);
 558         int len = nla_len(_bc);
 559
 560         while (len > 0) {
 561                 int yes = 1;
 562                 const struct inet_diag_bc_op *op = bc;
 563
 564                 switch (op->code) {
 565                 case INET_DIAG_BC_NOP:
 566                         break;
 567                 case INET_DIAG_BC_JMP:
 568                         yes = 0;
 569                         break;
 570                 case INET_DIAG_BC_S_EQ:
 571                         yes = entry->sport == op[1].no;
 572                         break;
 573                 case INET_DIAG_BC_S_GE:
 574                         yes = entry->sport >= op[1].no;
 575                         break;
 576                 case INET_DIAG_BC_S_LE:
 577                         yes = entry->sport <= op[1].no;
 578                         break;
 579                 case INET_DIAG_BC_D_EQ:
 580                         yes = entry->dport == op[1].no;
 581                         break;
 582                 case INET_DIAG_BC_D_GE:
 583                         yes = entry->dport >= op[1].no;
 584                         break;
 585                 case INET_DIAG_BC_D_LE:
 586                         yes = entry->dport <= op[1].no;
 587                         break;
 588                 case INET_DIAG_BC_AUTO:
 589                         yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
 590                         break;
 591                 case INET_DIAG_BC_S_COND:
 592                 case INET_DIAG_BC_D_COND: {
 593                         const struct inet_diag_hostcond *cond;
 594                         const __be32 *addr;
 595
 596                         cond = (const struct inet_diag_hostcond *)(op + 1);
 597                         if (cond->port != -1 &&
 598                             cond->port != (op->code == INET_DIAG_BC_S_COND ?
 599                                              entry->sport : entry->dport)) {
 600                                 yes = 0;
 601                                 break;
 602                         }
 603
 604                         if (op->code == INET_DIAG_BC_S_COND)
 605                                 addr = entry->saddr;
 606                         else
 607                                 addr = entry->daddr;
 608
 609                         if (cond->family != AF_UNSPEC &&
 610                             cond->family != entry->family) {
 611                                 if (entry->family == AF_INET6 &&
 612                                     cond->family == AF_INET) {
 613                                         if (addr[0] == 0 && addr[1] == 0 &&
 614                                             addr[2] == htonl(0xffff) &&
 615                                             bitstring_match(addr + 3,
 616                                                             cond->addr,
 617                                                             cond->prefix_len))
 618                                                 break;
 619                                 }
 620                                 yes = 0;
 621                                 break;
 622                         }
 623
 624                         if (cond->prefix_len == 0)
 625                                 break;
 626                         if (bitstring_match(addr, cond->addr,
 627                                             cond->prefix_len))
 628                                 break;
 629                         yes = 0;
 630                         break;
 631                 }
 632                 case INET_DIAG_BC_DEV_COND: {
 633                         u32 ifindex;
 634
 635                         ifindex = *((const u32 *)(op + 1));
 636                         if (ifindex != entry->ifindex)
 637                                 yes = 0;
 638                         break;
 639                 }
 640                 case INET_DIAG_BC_MARK_COND: {
 641                         struct inet_diag_markcond *cond;
 642
 643                         cond = (struct inet_diag_markcond *)(op + 1);
 644                         if ((entry->mark & cond->mask) != cond->mark)
 645                                 yes = 0;
 646                         break;
 647                 }
 648                 }
 649
 650                 if (yes) {
 651                         len -= op->yes;
 652                         bc += op->yes;
 653                 } else {
 654                         len -= op->no;
 655                         bc += op->no;
 656                 }
 657         }
 658         return len == 0;
 659 }
 660
 661 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
 662  */
 663 static void entry_fill_addrs(struct inet_diag_entry *entry,
 664                              const struct sock *sk)
 665 {
 666 #if IS_ENABLED(CONFIG_IPV6)
 667         if (sk->sk_family == AF_INET6) {
 668                 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
 669                 entry->daddr = sk->sk_v6_daddr.s6_addr32;
 670         } else
 671 #endif
 672         {
 673                 entry->saddr = &sk->sk_rcv_saddr;
 674                 entry->daddr = &sk->sk_daddr;
 675         }
 676 }
 677
 678 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
 679 {
 680         struct inet_sock *inet = inet_sk(sk);
 681         struct inet_diag_entry entry;
 682
 683         if (!bc)
 684                 return 1;
 685
 686         entry.family = sk->sk_family;
 687         entry_fill_addrs(&entry, sk);
 688         entry.sport = inet->inet_num;
 689         entry.dport = ntohs(inet->inet_dport);
 690         entry.ifindex = sk->sk_bound_dev_if;
 691         entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
 692         if (sk_fullsock(sk))
 693                 entry.mark = sk->sk_mark;
 694         else if (sk->sk_state == TCP_NEW_SYN_RECV)
 695                 entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark;
 696         else
 697                 entry.mark = 0;
 698
 699         return inet_diag_bc_run(bc, &entry);
 700 }
 701 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
 702
 703 static int valid_cc(const void *bc, int len, int cc)
 704 {
 705         while (len >= 0) {
 706                 const struct inet_diag_bc_op *op = bc;
 707
 708                 if (cc > len)
 709                         return 0;
 710                 if (cc == len)
 711                         return 1;
 712                 if (op->yes < 4 || op->yes & 3)
 713                         return 0;
 714                 len -= op->yes;
 715                 bc  += op->yes;
 716         }
 717         return 0;
 718 }
 719
 720 /* data is u32 ifindex */
 721 static bool valid_devcond(const struct inet_diag_bc_op *op, int len,
 722                           int *min_len)
 723 {
 724         /* Check ifindex space. */
 725         *min_len += sizeof(u32);
 726         if (len < *min_len)
 727                 return false;
 728
 729         return true;
 730 }
 731 /* Validate an inet_diag_hostcond. */
 732 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
 733                            int *min_len)
 734 {
 735         struct inet_diag_hostcond *cond;
 736         int addr_len;
 737
 738         /* Check hostcond space. */
 739         *min_len += sizeof(struct inet_diag_hostcond);
 740         if (len < *min_len)
 741                 return false;
 742         cond = (struct inet_diag_hostcond *)(op + 1);
 743
 744         /* Check address family and address length. */
 745         switch (cond->family) {
 746         case AF_UNSPEC:
 747                 addr_len = 0;
 748                 break;
 749         case AF_INET:
 750                 addr_len = sizeof(struct in_addr);
 751                 break;
 752         case AF_INET6:
 753                 addr_len = sizeof(struct in6_addr);
 754                 break;
 755         default:
 756                 return false;
 757         }
 758         *min_len += addr_len;
 759         if (len < *min_len)
 760                 return false;
 761
 762         /* Check prefix length (in bits) vs address length (in bytes). */
 763         if (cond->prefix_len > 8 * addr_len)
 764                 return false;
 765
 766         return true;
 767 }
 768
 769 /* Validate a port comparison operator. */
 770 static bool valid_port_comparison(const struct inet_diag_bc_op *op,
 771                                   int len, int *min_len)
 772 {
 773         /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
 774         *min_len += sizeof(struct inet_diag_bc_op);
 775         if (len < *min_len)
 776                 return false;
 777         return true;
 778 }
 779
 780 static bool valid_markcond(const struct inet_diag_bc_op *op, int len,
 781                            int *min_len)
 782 {
 783         *min_len += sizeof(struct inet_diag_markcond);
 784         return len >= *min_len;
 785 }
 786
 787 static int inet_diag_bc_audit(const struct nlattr *attr,
 788                               const struct sk_buff *skb)
 789 {
 790         bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN);
 791         const void *bytecode, *bc;
 792         int bytecode_len, len;
 793
 794         if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op))
 795                 return -EINVAL;
 796
 797         bytecode = bc = nla_data(attr);
 798         len = bytecode_len = nla_len(attr);
 799
 800         while (len > 0) {
 801                 int min_len = sizeof(struct inet_diag_bc_op);
 802                 const struct inet_diag_bc_op *op = bc;
 803
 804                 switch (op->code) {
 805                 case INET_DIAG_BC_S_COND:
 806                 case INET_DIAG_BC_D_COND:
 807                         if (!valid_hostcond(bc, len, &min_len))
 808                                 return -EINVAL;
 809                         break;
 810                 case INET_DIAG_BC_DEV_COND:
 811                         if (!valid_devcond(bc, len, &min_len))
 812                                 return -EINVAL;
 813                         break;
 814                 case INET_DIAG_BC_S_EQ:
 815                 case INET_DIAG_BC_S_GE:
 816                 case INET_DIAG_BC_S_LE:
 817                 case INET_DIAG_BC_D_EQ:
 818                 case INET_DIAG_BC_D_GE:
 819                 case INET_DIAG_BC_D_LE:
 820                         if (!valid_port_comparison(bc, len, &min_len))
 821                                 return -EINVAL;
 822                         break;
 823                 case INET_DIAG_BC_MARK_COND:
 824                         if (!net_admin)
 825                                 return -EPERM;
 826                         if (!valid_markcond(bc, len, &min_len))
 827                                 return -EINVAL;
 828                         break;
 829                 case INET_DIAG_BC_AUTO:
 830                 case INET_DIAG_BC_JMP:
 831                 case INET_DIAG_BC_NOP:
 832                         break;
 833                 default:
 834                         return -EINVAL;
 835                 }
 836
 837                 if (op->code != INET_DIAG_BC_NOP) {
 838                         if (op->no < min_len || op->no > len + 4 || op->no & 3)
 839                                 return -EINVAL;
 840                         if (op->no < len &&
 841                             !valid_cc(bytecode, bytecode_len, len - op->no))
 842                                 return -EINVAL;
 843                 }
 844
 845                 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
 846                         return -EINVAL;
 847                 bc  += op->yes;
 848                 len -= op->yes;
 849         }
 850         return len == 0 ? 0 : -EINVAL;
 851 }
 852
 853 static int inet_csk_diag_dump(struct sock *sk,
 854                               struct sk_buff *skb,
 855                               struct netlink_callback *cb,
 856                               const struct inet_diag_req_v2 *r,
 857                               const struct nlattr *bc,
 858                               bool net_admin)
 859 {
 860         if (!inet_diag_bc_sk(bc, sk))
 861                 return 0;
 862
 863         return inet_csk_diag_fill(sk, skb, r,
 864                                   sk_user_ns(NETLINK_CB(cb->skb).sk),
 865                                   NETLINK_CB(cb->skb).portid,
 866                                   cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh,
 867                                   net_admin);
 868 }
 869
 870 static void twsk_build_assert(void)
 871 {
 872         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
 873                      offsetof(struct sock, sk_family));
 874
 875         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
 876                      offsetof(struct inet_sock, inet_num));
 877
 878         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
 879                      offsetof(struct inet_sock, inet_dport));
 880
 881         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
 882                      offsetof(struct inet_sock, inet_rcv_saddr));
 883
 884         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
 885                      offsetof(struct inet_sock, inet_daddr));
 886
 887 #if IS_ENABLED(CONFIG_IPV6)
 888         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
 889                      offsetof(struct sock, sk_v6_rcv_saddr));
 890
 891         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
 892                      offsetof(struct sock, sk_v6_daddr));
 893 #endif
 894 }
 895
 896 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
 897                          struct netlink_callback *cb,
 898                          const struct inet_diag_req_v2 *r, struct nlattr *bc)
 899 {
 900         bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
 901         struct net *net = sock_net(skb->sk);
 902         u32 idiag_states = r->idiag_states;
 903         int i, num, s_i, s_num;
 904         struct sock *sk;
 905
 906         if (idiag_states & TCPF_SYN_RECV)
 907                 idiag_states |= TCPF_NEW_SYN_RECV;
 908         s_i = cb->args[1];
 909         s_num = num = cb->args[2];
 910
 911         if (cb->args[0] == 0) {
 912                 if (!(idiag_states & TCPF_LISTEN) || r->id.idiag_dport)
 913                         goto skip_listen_ht;
 914
 915                 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
 916                         struct inet_listen_hashbucket *ilb;
 917
 918                         num = 0;
 919                         ilb = &hashinfo->listening_hash[i];
 920                         spin_lock(&ilb->lock);
 921                         sk_for_each(sk, &ilb->head) {
 922                                 struct inet_sock *inet = inet_sk(sk);
 923
 924                                 if (!net_eq(sock_net(sk), net))
 925                                         continue;
 926
 927                                 if (num < s_num) {
 928                                         num++;
 929                                         continue;
 930                                 }
 931
 932                                 if (r->sdiag_family != AF_UNSPEC &&
 933                                     sk->sk_family != r->sdiag_family)
 934                                         goto next_listen;
 935
 936                                 if (r->id.idiag_sport != inet->inet_sport &&
 937                                     r->id.idiag_sport)
 938                                         goto next_listen;
 939
 940                                 if (inet_csk_diag_dump(sk, skb, cb, r,
 941                                                        bc, net_admin) < 0) {
 942                                         spin_unlock(&ilb->lock);
 943                                         goto done;
 944                                 }
 945
 946 next_listen:
 947                                 ++num;
 948                         }
 949                         spin_unlock(&ilb->lock);
 950
 951                         s_num = 0;
 952                 }
 953 skip_listen_ht:
 954                 cb->args[0] = 1;
 955                 s_i = num = s_num = 0;
 956         }
 957
 958         if (!(idiag_states & ~TCPF_LISTEN))
 959                 goto out;
 960
 961 #define SKARR_SZ 16
 962         for (i = s_i; i <= hashinfo->ehash_mask; i++) {
 963                 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
 964                 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
 965                 struct hlist_nulls_node *node;
 966                 struct sock *sk_arr[SKARR_SZ];
 967                 int num_arr[SKARR_SZ];
 968                 int idx, accum, res;
 969
 970                 if (hlist_nulls_empty(&head->chain))
 971                         continue;
 972
 973                 if (i > s_i)
 974                         s_num = 0;
 975
 976 next_chunk:
 977                 num = 0;
 978                 accum = 0;
 979                 spin_lock_bh(lock);
 980                 sk_nulls_for_each(sk, node, &head->chain) {
 981                         int state;
 982
 983                         if (!net_eq(sock_net(sk), net))
 984                                 continue;
 985                         if (num < s_num)
 986                                 goto next_normal;
 987                         state = (sk->sk_state == TCP_TIME_WAIT) ?
 988                                 inet_twsk(sk)->tw_substate : sk->sk_state;
 989                         if (!(idiag_states & (1 << state)))
 990                                 goto next_normal;
 991                         if (r->sdiag_family != AF_UNSPEC &&
 992                             sk->sk_family != r->sdiag_family)
 993                                 goto next_normal;
 994                         if (r->id.idiag_sport != htons(sk->sk_num) &&
 995                             r->id.idiag_sport)
 996                                 goto next_normal;
 997                         if (r->id.idiag_dport != sk->sk_dport &&
 998                             r->id.idiag_dport)
 999                                 goto next_normal;
1000                         twsk_build_assert();
1001
1002                         if (!inet_diag_bc_sk(bc, sk))
1003                                 goto next_normal;
1004
1005                         if (!refcount_inc_not_zero(&sk->sk_refcnt))
1006                                 goto next_normal;
1007
1008                         num_arr[accum] = num;
1009                         sk_arr[accum] = sk;
1010                         if (++accum == SKARR_SZ)
1011                                 break;
1012 next_normal:
1013                         ++num;
1014                 }
1015                 spin_unlock_bh(lock);
1016                 res = 0;
1017                 for (idx = 0; idx < accum; idx++) {
1018                         if (res >= 0) {
1019                                 res = sk_diag_fill(sk_arr[idx], skb, r,
1020                                            sk_user_ns(NETLINK_CB(cb->skb).sk),
1021                                            NETLINK_CB(cb->skb).portid,
1022                                            cb->nlh->nlmsg_seq, NLM_F_MULTI,
1023                                            cb->nlh, net_admin);
1024                                 if (res < 0)
1025                                         num = num_arr[idx];
1026                         }
1027                         sock_gen_put(sk_arr[idx]);
1028                 }
1029                 if (res < 0)
1030                         break;
1031                 cond_resched();
1032                 if (accum == SKARR_SZ) {
1033                         s_num = num + 1;
1034                         goto next_chunk;
1035                 }
1036         }
1037
1038 done:
1039         cb->args[1] = i;
1040         cb->args[2] = num;
1041 out:
1042         ;
1043 }
1044 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
1045
1046 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
1047                             const struct inet_diag_req_v2 *r,
1048                             struct nlattr *bc)
1049 {
1050         const struct inet_diag_handler *handler;
1051         int err = 0;
1052
1053         handler = inet_diag_lock_handler(r->sdiag_protocol);
1054         if (!IS_ERR(handler))
1055                 handler->dump(skb, cb, r, bc);
1056         else
1057                 err = PTR_ERR(handler);
1058         inet_diag_unlock_handler(handler);
1059
1060         return err ? : skb->len;
1061 }
1062
1063 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
1064 {
1065         int hdrlen = sizeof(struct inet_diag_req_v2);
1066         struct nlattr *bc = NULL;
1067
1068         if (nlmsg_attrlen(cb->nlh, hdrlen))
1069                 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1070
1071         return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
1072 }
1073
1074 static int inet_diag_type2proto(int type)
1075 {
1076         switch (type) {
1077         case TCPDIAG_GETSOCK:
1078                 return IPPROTO_TCP;
1079         case DCCPDIAG_GETSOCK:
1080                 return IPPROTO_DCCP;
1081         default:
1082                 return 0;
1083         }
1084 }
1085
1086 static int inet_diag_dump_compat(struct sk_buff *skb,
1087                                  struct netlink_callback *cb)
1088 {
1089         struct inet_diag_req *rc = nlmsg_data(cb->nlh);
1090         int hdrlen = sizeof(struct inet_diag_req);
1091         struct inet_diag_req_v2 req;
1092         struct nlattr *bc = NULL;
1093
1094         req.sdiag_family = AF_UNSPEC; /* compatibility */
1095         req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1096         req.idiag_ext = rc->idiag_ext;
1097         req.idiag_states = rc->idiag_states;
1098         req.id = rc->id;
1099
1100         if (nlmsg_attrlen(cb->nlh, hdrlen))
1101                 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1102
1103         return __inet_diag_dump(skb, cb, &req, bc);
1104 }
1105
1106 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1107                                       const struct nlmsghdr *nlh)
1108 {
1109         struct inet_diag_req *rc = nlmsg_data(nlh);
1110         struct inet_diag_req_v2 req;
1111
1112         req.sdiag_family = rc->idiag_family;
1113         req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1114         req.idiag_ext = rc->idiag_ext;
1115         req.idiag_states = rc->idiag_states;
1116         req.id = rc->id;
1117
1118         return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req);
1119 }
1120
1121 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1122 {
1123         int hdrlen = sizeof(struct inet_diag_req);
1124         struct net *net = sock_net(skb->sk);
1125
1126         if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1127             nlmsg_len(nlh) < hdrlen)
1128                 return -EINVAL;
1129
1130         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1131                 if (nlmsg_attrlen(nlh, hdrlen)) {
1132                         struct nlattr *attr;
1133                         int err;
1134
1135                         attr = nlmsg_find_attr(nlh, hdrlen,
1136                                                INET_DIAG_REQ_BYTECODE);
1137                         err = inet_diag_bc_audit(attr, skb);
1138                         if (err)
1139                                 return err;
1140                 }
1141                 {
1142                         struct netlink_dump_control c = {
1143                                 .dump = inet_diag_dump_compat,
1144                         };
1145                         return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1146                 }
1147         }
1148
1149         return inet_diag_get_exact_compat(skb, nlh);
1150 }
1151
1152 static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
1153 {
1154         int hdrlen = sizeof(struct inet_diag_req_v2);
1155         struct net *net = sock_net(skb->sk);
1156
1157         if (nlmsg_len(h) < hdrlen)
1158                 return -EINVAL;
1159
1160         if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1161             h->nlmsg_flags & NLM_F_DUMP) {
1162                 if (nlmsg_attrlen(h, hdrlen)) {
1163                         struct nlattr *attr;
1164                         int err;
1165
1166                         attr = nlmsg_find_attr(h, hdrlen,
1167                                                INET_DIAG_REQ_BYTECODE);
1168                         err = inet_diag_bc_audit(attr, skb);
1169                         if (err)
1170                                 return err;
1171                 }
1172                 {
1173                         struct netlink_dump_control c = {
1174                                 .dump = inet_diag_dump,
1175                         };
1176                         return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1177                 }
1178         }
1179
1180         return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h));
1181 }
1182
1183 static
1184 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1185 {
1186         const struct inet_diag_handler *handler;
1187         struct nlmsghdr *nlh;
1188         struct nlattr *attr;
1189         struct inet_diag_msg *r;
1190         void *info = NULL;
1191         int err = 0;
1192
1193         nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1194         if (!nlh)
1195                 return -ENOMEM;
1196
1197         r = nlmsg_data(nlh);
1198         memset(r, 0, sizeof(*r));
1199         inet_diag_msg_common_fill(r, sk);
1200         if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1201                 r->id.idiag_sport = inet_sk(sk)->inet_sport;
1202         r->idiag_state = sk->sk_state;
1203
1204         if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1205                 nlmsg_cancel(skb, nlh);
1206                 return err;
1207         }
1208
1209         handler = inet_diag_lock_handler(sk->sk_protocol);
1210         if (IS_ERR(handler)) {
1211                 inet_diag_unlock_handler(handler);
1212                 nlmsg_cancel(skb, nlh);
1213                 return PTR_ERR(handler);
1214         }
1215
1216         attr = handler->idiag_info_size
1217                 ? nla_reserve_64bit(skb, INET_DIAG_INFO,
1218                                     handler->idiag_info_size,
1219                                     INET_DIAG_PAD)
1220                 : NULL;
1221         if (attr)
1222                 info = nla_data(attr);
1223
1224         handler->idiag_get_info(sk, r, info);
1225         inet_diag_unlock_handler(handler);
1226
1227         nlmsg_end(skb, nlh);
1228         return 0;
1229 }
1230
1231 static const struct sock_diag_handler inet_diag_handler = {
1232         .family = AF_INET,
1233         .dump = inet_diag_handler_cmd,
1234         .get_info = inet_diag_handler_get_info,
1235         .destroy = inet_diag_handler_cmd,
1236 };
1237
1238 static const struct sock_diag_handler inet6_diag_handler = {
1239         .family = AF_INET6,
1240         .dump = inet_diag_handler_cmd,
1241         .get_info = inet_diag_handler_get_info,
1242         .destroy = inet_diag_handler_cmd,
1243 };
1244
1245 int inet_diag_register(const struct inet_diag_handler *h)
1246 {
1247         const __u16 type = h->idiag_type;
1248         int err = -EINVAL;
1249
1250         if (type >= IPPROTO_MAX)
1251                 goto out;
1252
1253         mutex_lock(&inet_diag_table_mutex);
1254         err = -EEXIST;
1255         if (!inet_diag_table[type]) {
1256                 inet_diag_table[type] = h;
1257                 err = 0;
1258         }
1259         mutex_unlock(&inet_diag_table_mutex);
1260 out:
1261         return err;
1262 }
1263 EXPORT_SYMBOL_GPL(inet_diag_register);
1264
1265 void inet_diag_unregister(const struct inet_diag_handler *h)
1266 {
1267         const __u16 type = h->idiag_type;
1268
1269         if (type >= IPPROTO_MAX)
1270                 return;
1271
1272         mutex_lock(&inet_diag_table_mutex);
1273         inet_diag_table[type] = NULL;
1274         mutex_unlock(&inet_diag_table_mutex);
1275 }
1276 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1277
1278 static int __init inet_diag_init(void)
1279 {
1280         const int inet_diag_table_size = (IPPROTO_MAX *
1281                                           sizeof(struct inet_diag_handler *));
1282         int err = -ENOMEM;
1283
1284         inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1285         if (!inet_diag_table)
1286                 goto out;
1287
1288         err = sock_diag_register(&inet_diag_handler);
1289         if (err)
1290                 goto out_free_nl;
1291
1292         err = sock_diag_register(&inet6_diag_handler);
1293         if (err)
1294                 goto out_free_inet;
1295
1296         sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1297 out:
1298         return err;
1299
1300 out_free_inet:
1301         sock_diag_unregister(&inet_diag_handler);
1302 out_free_nl:
1303         kfree(inet_diag_table);
1304         goto out;
1305 }
1306
1307 static void __exit inet_diag_exit(void)
1308 {
1309         sock_diag_unregister(&inet6_diag_handler);
1310         sock_diag_unregister(&inet_diag_handler);
1311         sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1312         kfree(inet_diag_table);
1313 }
1314
1315 module_init(inet_diag_init);
1316 module_exit(inet_diag_exit);
1317 MODULE_LICENSE("GPL");
1318 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1319 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);