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, <[email protected]>
   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_delta_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_delta_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_delta_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         inet_diag_msg_common_fill(r, sk);
 346         r->idiag_retrans      = 0;
 347
 348         r->idiag_state        = tw->tw_substate;
 349         r->idiag_timer        = 3;
 350         tmo = tw->tw_timer.expires - jiffies;
 351         r->idiag_expires      = jiffies_delta_to_msecs(tmo);
 352         r->idiag_rqueue       = 0;
 353         r->idiag_wqueue       = 0;
 354         r->idiag_uid          = 0;
 355         r->idiag_inode        = 0;
 356
 357         nlmsg_end(skb, nlh);
 358         return 0;
 359 }
 360
 361 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
 362                               u32 portid, u32 seq, u16 nlmsg_flags,
 363                               const struct nlmsghdr *unlh, bool net_admin)
 364 {
 365         struct request_sock *reqsk = inet_reqsk(sk);
 366         struct inet_diag_msg *r;
 367         struct nlmsghdr *nlh;
 368         long tmo;
 369
 370         nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
 371                         nlmsg_flags);
 372         if (!nlh)
 373                 return -EMSGSIZE;
 374
 375         r = nlmsg_data(nlh);
 376         inet_diag_msg_common_fill(r, sk);
 377         r->idiag_state = TCP_SYN_RECV;
 378         r->idiag_timer = 1;
 379         r->idiag_retrans = reqsk->num_retrans;
 380
 381         BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
 382                      offsetof(struct sock, sk_cookie));
 383
 384         tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
 385         r->idiag_expires = jiffies_delta_to_msecs(tmo);
 386         r->idiag_rqueue = 0;
 387         r->idiag_wqueue = 0;
 388         r->idiag_uid    = 0;
 389         r->idiag_inode  = 0;
 390
 391         if (net_admin && nla_put_u32(skb, INET_DIAG_MARK,
 392                                      inet_rsk(reqsk)->ir_mark))
 393                 return -EMSGSIZE;
 394
 395         nlmsg_end(skb, nlh);
 396         return 0;
 397 }
 398
 399 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
 400                         const struct inet_diag_req_v2 *r,
 401                         struct user_namespace *user_ns,
 402                         u32 portid, u32 seq, u16 nlmsg_flags,
 403                         const struct nlmsghdr *unlh, bool net_admin)
 404 {
 405         if (sk->sk_state == TCP_TIME_WAIT)
 406                 return inet_twsk_diag_fill(sk, skb, portid, seq,
 407                                            nlmsg_flags, unlh);
 408
 409         if (sk->sk_state == TCP_NEW_SYN_RECV)
 410                 return inet_req_diag_fill(sk, skb, portid, seq,
 411                                           nlmsg_flags, unlh, net_admin);
 412
 413         return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
 414                                   nlmsg_flags, unlh, net_admin);
 415 }
 416
 417 struct sock *inet_diag_find_one_icsk(struct net *net,
 418                                      struct inet_hashinfo *hashinfo,
 419                                      const struct inet_diag_req_v2 *req)
 420 {
 421         struct sock *sk;
 422
 423         rcu_read_lock();
 424         if (req->sdiag_family == AF_INET)
 425                 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
 426                                  req->id.idiag_dport, req->id.idiag_src[0],
 427                                  req->id.idiag_sport, req->id.idiag_if);
 428 #if IS_ENABLED(CONFIG_IPV6)
 429         else if (req->sdiag_family == AF_INET6) {
 430                 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
 431                     ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
 432                         sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
 433                                          req->id.idiag_dport, req->id.idiag_src[3],
 434                                          req->id.idiag_sport, req->id.idiag_if);
 435                 else
 436                         sk = inet6_lookup(net, hashinfo, NULL, 0,
 437                                           (struct in6_addr *)req->id.idiag_dst,
 438                                           req->id.idiag_dport,
 439                                           (struct in6_addr *)req->id.idiag_src,
 440                                           req->id.idiag_sport,
 441                                           req->id.idiag_if);
 442         }
 443 #endif
 444         else {
 445                 rcu_read_unlock();
 446                 return ERR_PTR(-EINVAL);
 447         }
 448         rcu_read_unlock();
 449         if (!sk)
 450                 return ERR_PTR(-ENOENT);
 451
 452         if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
 453                 sock_gen_put(sk);
 454                 return ERR_PTR(-ENOENT);
 455         }
 456
 457         return sk;
 458 }
 459 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
 460
 461 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
 462                             struct sk_buff *in_skb,
 463                             const struct nlmsghdr *nlh,
 464                             const struct inet_diag_req_v2 *req)
 465 {
 466         bool net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN);
 467         struct net *net = sock_net(in_skb->sk);
 468         struct sk_buff *rep;
 469         struct sock *sk;
 470         int err;
 471
 472         sk = inet_diag_find_one_icsk(net, hashinfo, req);
 473         if (IS_ERR(sk))
 474                 return PTR_ERR(sk);
 475
 476         rep = nlmsg_new(inet_sk_attr_size(sk, req, net_admin), GFP_KERNEL);
 477         if (!rep) {
 478                 err = -ENOMEM;
 479                 goto out;
 480         }
 481
 482         err = sk_diag_fill(sk, rep, req,
 483                            sk_user_ns(NETLINK_CB(in_skb).sk),
 484                            NETLINK_CB(in_skb).portid,
 485                            nlh->nlmsg_seq, 0, nlh, net_admin);
 486         if (err < 0) {
 487                 WARN_ON(err == -EMSGSIZE);
 488                 nlmsg_free(rep);
 489                 goto out;
 490         }
 491         err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
 492                               MSG_DONTWAIT);
 493         if (err > 0)
 494                 err = 0;
 495
 496 out:
 497         if (sk)
 498                 sock_gen_put(sk);
 499
 500         return err;
 501 }
 502 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
 503
 504 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
 505                                const struct nlmsghdr *nlh,
 506                                const struct inet_diag_req_v2 *req)
 507 {
 508         const struct inet_diag_handler *handler;
 509         int err;
 510
 511         handler = inet_diag_lock_handler(req->sdiag_protocol);
 512         if (IS_ERR(handler))
 513                 err = PTR_ERR(handler);
 514         else if (cmd == SOCK_DIAG_BY_FAMILY)
 515                 err = handler->dump_one(in_skb, nlh, req);
 516         else if (cmd == SOCK_DESTROY && handler->destroy)
 517                 err = handler->destroy(in_skb, req);
 518         else
 519                 err = -EOPNOTSUPP;
 520         inet_diag_unlock_handler(handler);
 521
 522         return err;
 523 }
 524
 525 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
 526 {
 527         int words = bits >> 5;
 528
 529         bits &= 0x1f;
 530
 531         if (words) {
 532                 if (memcmp(a1, a2, words << 2))
 533                         return 0;
 534         }
 535         if (bits) {
 536                 __be32 w1, w2;
 537                 __be32 mask;
 538
 539                 w1 = a1[words];
 540                 w2 = a2[words];
 541
 542                 mask = htonl((0xffffffff) << (32 - bits));
 543
 544                 if ((w1 ^ w2) & mask)
 545                         return 0;
 546         }
 547
 548         return 1;
 549 }
 550
 551 static int inet_diag_bc_run(const struct nlattr *_bc,
 552                             const struct inet_diag_entry *entry)
 553 {
 554         const void *bc = nla_data(_bc);
 555         int len = nla_len(_bc);
 556
 557         while (len > 0) {
 558                 int yes = 1;
 559                 const struct inet_diag_bc_op *op = bc;
 560
 561                 switch (op->code) {
 562                 case INET_DIAG_BC_NOP:
 563                         break;
 564                 case INET_DIAG_BC_JMP:
 565                         yes = 0;
 566                         break;
 567                 case INET_DIAG_BC_S_EQ:
 568                         yes = entry->sport == op[1].no;
 569                         break;
 570                 case INET_DIAG_BC_S_GE:
 571                         yes = entry->sport >= op[1].no;
 572                         break;
 573                 case INET_DIAG_BC_S_LE:
 574                         yes = entry->sport <= op[1].no;
 575                         break;
 576                 case INET_DIAG_BC_D_EQ:
 577                         yes = entry->dport == op[1].no;
 578                         break;
 579                 case INET_DIAG_BC_D_GE:
 580                         yes = entry->dport >= op[1].no;
 581                         break;
 582                 case INET_DIAG_BC_D_LE:
 583                         yes = entry->dport <= op[1].no;
 584                         break;
 585                 case INET_DIAG_BC_AUTO:
 586                         yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
 587                         break;
 588                 case INET_DIAG_BC_S_COND:
 589                 case INET_DIAG_BC_D_COND: {
 590                         const struct inet_diag_hostcond *cond;
 591                         const __be32 *addr;
 592
 593                         cond = (const struct inet_diag_hostcond *)(op + 1);
 594                         if (cond->port != -1 &&
 595                             cond->port != (op->code == INET_DIAG_BC_S_COND ?
 596                                              entry->sport : entry->dport)) {
 597                                 yes = 0;
 598                                 break;
 599                         }
 600
 601                         if (op->code == INET_DIAG_BC_S_COND)
 602                                 addr = entry->saddr;
 603                         else
 604                                 addr = entry->daddr;
 605
 606                         if (cond->family != AF_UNSPEC &&
 607                             cond->family != entry->family) {
 608                                 if (entry->family == AF_INET6 &&
 609                                     cond->family == AF_INET) {
 610                                         if (addr[0] == 0 && addr[1] == 0 &&
 611                                             addr[2] == htonl(0xffff) &&
 612                                             bitstring_match(addr + 3,
 613                                                             cond->addr,
 614                                                             cond->prefix_len))
 615                                                 break;
 616                                 }
 617                                 yes = 0;
 618                                 break;
 619                         }
 620
 621                         if (cond->prefix_len == 0)
 622                                 break;
 623                         if (bitstring_match(addr, cond->addr,
 624                                             cond->prefix_len))
 625                                 break;
 626                         yes = 0;
 627                         break;
 628                 }
 629                 case INET_DIAG_BC_DEV_COND: {
 630                         u32 ifindex;
 631
 632                         ifindex = *((const u32 *)(op + 1));
 633                         if (ifindex != entry->ifindex)
 634                                 yes = 0;
 635                         break;
 636                 }
 637                 case INET_DIAG_BC_MARK_COND: {
 638                         struct inet_diag_markcond *cond;
 639
 640                         cond = (struct inet_diag_markcond *)(op + 1);
 641                         if ((entry->mark & cond->mask) != cond->mark)
 642                                 yes = 0;
 643                         break;
 644                 }
 645                 }
 646
 647                 if (yes) {
 648                         len -= op->yes;
 649                         bc += op->yes;
 650                 } else {
 651                         len -= op->no;
 652                         bc += op->no;
 653                 }
 654         }
 655         return len == 0;
 656 }
 657
 658 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
 659  */
 660 static void entry_fill_addrs(struct inet_diag_entry *entry,
 661                              const struct sock *sk)
 662 {
 663 #if IS_ENABLED(CONFIG_IPV6)
 664         if (sk->sk_family == AF_INET6) {
 665                 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
 666                 entry->daddr = sk->sk_v6_daddr.s6_addr32;
 667         } else
 668 #endif
 669         {
 670                 entry->saddr = &sk->sk_rcv_saddr;
 671                 entry->daddr = &sk->sk_daddr;
 672         }
 673 }
 674
 675 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
 676 {
 677         struct inet_sock *inet = inet_sk(sk);
 678         struct inet_diag_entry entry;
 679
 680         if (!bc)
 681                 return 1;
 682
 683         entry.family = sk->sk_family;
 684         entry_fill_addrs(&entry, sk);
 685         entry.sport = inet->inet_num;
 686         entry.dport = ntohs(inet->inet_dport);
 687         entry.ifindex = sk->sk_bound_dev_if;
 688         entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
 689         if (sk_fullsock(sk))
 690                 entry.mark = sk->sk_mark;
 691         else if (sk->sk_state == TCP_NEW_SYN_RECV)
 692                 entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark;
 693         else
 694                 entry.mark = 0;
 695
 696         return inet_diag_bc_run(bc, &entry);
 697 }
 698 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
 699
 700 static int valid_cc(const void *bc, int len, int cc)
 701 {
 702         while (len >= 0) {
 703                 const struct inet_diag_bc_op *op = bc;
 704
 705                 if (cc > len)
 706                         return 0;
 707                 if (cc == len)
 708                         return 1;
 709                 if (op->yes < 4 || op->yes & 3)
 710                         return 0;
 711                 len -= op->yes;
 712                 bc  += op->yes;
 713         }
 714         return 0;
 715 }
 716
 717 /* data is u32 ifindex */
 718 static bool valid_devcond(const struct inet_diag_bc_op *op, int len,
 719                           int *min_len)
 720 {
 721         /* Check ifindex space. */
 722         *min_len += sizeof(u32);
 723         if (len < *min_len)
 724                 return false;
 725
 726         return true;
 727 }
 728 /* Validate an inet_diag_hostcond. */
 729 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
 730                            int *min_len)
 731 {
 732         struct inet_diag_hostcond *cond;
 733         int addr_len;
 734
 735         /* Check hostcond space. */
 736         *min_len += sizeof(struct inet_diag_hostcond);
 737         if (len < *min_len)
 738                 return false;
 739         cond = (struct inet_diag_hostcond *)(op + 1);
 740
 741         /* Check address family and address length. */
 742         switch (cond->family) {
 743         case AF_UNSPEC:
 744                 addr_len = 0;
 745                 break;
 746         case AF_INET:
 747                 addr_len = sizeof(struct in_addr);
 748                 break;
 749         case AF_INET6:
 750                 addr_len = sizeof(struct in6_addr);
 751                 break;
 752         default:
 753                 return false;
 754         }
 755         *min_len += addr_len;
 756         if (len < *min_len)
 757                 return false;
 758
 759         /* Check prefix length (in bits) vs address length (in bytes). */
 760         if (cond->prefix_len > 8 * addr_len)
 761                 return false;
 762
 763         return true;
 764 }
 765
 766 /* Validate a port comparison operator. */
 767 static bool valid_port_comparison(const struct inet_diag_bc_op *op,
 768                                   int len, int *min_len)
 769 {
 770         /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
 771         *min_len += sizeof(struct inet_diag_bc_op);
 772         if (len < *min_len)
 773                 return false;
 774         return true;
 775 }
 776
 777 static bool valid_markcond(const struct inet_diag_bc_op *op, int len,
 778                            int *min_len)
 779 {
 780         *min_len += sizeof(struct inet_diag_markcond);
 781         return len >= *min_len;
 782 }
 783
 784 static int inet_diag_bc_audit(const struct nlattr *attr,
 785                               const struct sk_buff *skb)
 786 {
 787         bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN);
 788         const void *bytecode, *bc;
 789         int bytecode_len, len;
 790
 791         if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op))
 792                 return -EINVAL;
 793
 794         bytecode = bc = nla_data(attr);
 795         len = bytecode_len = nla_len(attr);
 796
 797         while (len > 0) {
 798                 int min_len = sizeof(struct inet_diag_bc_op);
 799                 const struct inet_diag_bc_op *op = bc;
 800
 801                 switch (op->code) {
 802                 case INET_DIAG_BC_S_COND:
 803                 case INET_DIAG_BC_D_COND:
 804                         if (!valid_hostcond(bc, len, &min_len))
 805                                 return -EINVAL;
 806                         break;
 807                 case INET_DIAG_BC_DEV_COND:
 808                         if (!valid_devcond(bc, len, &min_len))
 809                                 return -EINVAL;
 810                         break;
 811                 case INET_DIAG_BC_S_EQ:
 812                 case INET_DIAG_BC_S_GE:
 813                 case INET_DIAG_BC_S_LE:
 814                 case INET_DIAG_BC_D_EQ:
 815                 case INET_DIAG_BC_D_GE:
 816                 case INET_DIAG_BC_D_LE:
 817                         if (!valid_port_comparison(bc, len, &min_len))
 818                                 return -EINVAL;
 819                         break;
 820                 case INET_DIAG_BC_MARK_COND:
 821                         if (!net_admin)
 822                                 return -EPERM;
 823                         if (!valid_markcond(bc, len, &min_len))
 824                                 return -EINVAL;
 825                         break;
 826                 case INET_DIAG_BC_AUTO:
 827                 case INET_DIAG_BC_JMP:
 828                 case INET_DIAG_BC_NOP:
 829                         break;
 830                 default:
 831                         return -EINVAL;
 832                 }
 833
 834                 if (op->code != INET_DIAG_BC_NOP) {
 835                         if (op->no < min_len || op->no > len + 4 || op->no & 3)
 836                                 return -EINVAL;
 837                         if (op->no < len &&
 838                             !valid_cc(bytecode, bytecode_len, len - op->no))
 839                                 return -EINVAL;
 840                 }
 841
 842                 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
 843                         return -EINVAL;
 844                 bc  += op->yes;
 845                 len -= op->yes;
 846         }
 847         return len == 0 ? 0 : -EINVAL;
 848 }
 849
 850 static int inet_csk_diag_dump(struct sock *sk,
 851                               struct sk_buff *skb,
 852                               struct netlink_callback *cb,
 853                               const struct inet_diag_req_v2 *r,
 854                               const struct nlattr *bc,
 855                               bool net_admin)
 856 {
 857         if (!inet_diag_bc_sk(bc, sk))
 858                 return 0;
 859
 860         return inet_csk_diag_fill(sk, skb, r,
 861                                   sk_user_ns(NETLINK_CB(cb->skb).sk),
 862                                   NETLINK_CB(cb->skb).portid,
 863                                   cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh,
 864                                   net_admin);
 865 }
 866
 867 static void twsk_build_assert(void)
 868 {
 869         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
 870                      offsetof(struct sock, sk_family));
 871
 872         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
 873                      offsetof(struct inet_sock, inet_num));
 874
 875         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
 876                      offsetof(struct inet_sock, inet_dport));
 877
 878         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
 879                      offsetof(struct inet_sock, inet_rcv_saddr));
 880
 881         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
 882                      offsetof(struct inet_sock, inet_daddr));
 883
 884 #if IS_ENABLED(CONFIG_IPV6)
 885         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
 886                      offsetof(struct sock, sk_v6_rcv_saddr));
 887
 888         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
 889                      offsetof(struct sock, sk_v6_daddr));
 890 #endif
 891 }
 892
 893 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
 894                          struct netlink_callback *cb,
 895                          const struct inet_diag_req_v2 *r, struct nlattr *bc)
 896 {
 897         bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
 898         struct net *net = sock_net(skb->sk);
 899         u32 idiag_states = r->idiag_states;
 900         int i, num, s_i, s_num;
 901         struct sock *sk;
 902
 903         if (idiag_states & TCPF_SYN_RECV)
 904                 idiag_states |= TCPF_NEW_SYN_RECV;
 905         s_i = cb->args[1];
 906         s_num = num = cb->args[2];
 907
 908         if (cb->args[0] == 0) {
 909                 if (!(idiag_states & TCPF_LISTEN) || r->id.idiag_dport)
 910                         goto skip_listen_ht;
 911
 912                 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
 913                         struct inet_listen_hashbucket *ilb;
 914
 915                         num = 0;
 916                         ilb = &hashinfo->listening_hash[i];
 917                         spin_lock(&ilb->lock);
 918                         sk_for_each(sk, &ilb->head) {
 919                                 struct inet_sock *inet = inet_sk(sk);
 920
 921                                 if (!net_eq(sock_net(sk), net))
 922                                         continue;
 923
 924                                 if (num < s_num) {
 925                                         num++;
 926                                         continue;
 927                                 }
 928
 929                                 if (r->sdiag_family != AF_UNSPEC &&
 930                                     sk->sk_family != r->sdiag_family)
 931                                         goto next_listen;
 932
 933                                 if (r->id.idiag_sport != inet->inet_sport &&
 934                                     r->id.idiag_sport)
 935                                         goto next_listen;
 936
 937                                 if (inet_csk_diag_dump(sk, skb, cb, r,
 938                                                        bc, net_admin) < 0) {
 939                                         spin_unlock(&ilb->lock);
 940                                         goto done;
 941                                 }
 942
 943 next_listen:
 944                                 ++num;
 945                         }
 946                         spin_unlock(&ilb->lock);
 947
 948                         s_num = 0;
 949                 }
 950 skip_listen_ht:
 951                 cb->args[0] = 1;
 952                 s_i = num = s_num = 0;
 953         }
 954
 955         if (!(idiag_states & ~TCPF_LISTEN))
 956                 goto out;
 957
 958 #define SKARR_SZ 16
 959         for (i = s_i; i <= hashinfo->ehash_mask; i++) {
 960                 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
 961                 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
 962                 struct hlist_nulls_node *node;
 963                 struct sock *sk_arr[SKARR_SZ];
 964                 int num_arr[SKARR_SZ];
 965                 int idx, accum, res;
 966
 967                 if (hlist_nulls_empty(&head->chain))
 968                         continue;
 969
 970                 if (i > s_i)
 971                         s_num = 0;
 972
 973 next_chunk:
 974                 num = 0;
 975                 accum = 0;
 976                 spin_lock_bh(lock);
 977                 sk_nulls_for_each(sk, node, &head->chain) {
 978                         int state;
 979
 980                         if (!net_eq(sock_net(sk), net))
 981                                 continue;
 982                         if (num < s_num)
 983                                 goto next_normal;
 984                         state = (sk->sk_state == TCP_TIME_WAIT) ?
 985                                 inet_twsk(sk)->tw_substate : sk->sk_state;
 986                         if (!(idiag_states & (1 << state)))
 987                                 goto next_normal;
 988                         if (r->sdiag_family != AF_UNSPEC &&
 989                             sk->sk_family != r->sdiag_family)
 990                                 goto next_normal;
 991                         if (r->id.idiag_sport != htons(sk->sk_num) &&
 992                             r->id.idiag_sport)
 993                                 goto next_normal;
 994                         if (r->id.idiag_dport != sk->sk_dport &&
 995                             r->id.idiag_dport)
 996                                 goto next_normal;
 997                         twsk_build_assert();
 998
 999                         if (!inet_diag_bc_sk(bc, sk))
1000                                 goto next_normal;
1001
1002                         if (!refcount_inc_not_zero(&sk->sk_refcnt))
1003                                 goto next_normal;
1004
1005                         num_arr[accum] = num;
1006                         sk_arr[accum] = sk;
1007                         if (++accum == SKARR_SZ)
1008                                 break;
1009 next_normal:
1010                         ++num;
1011                 }
1012                 spin_unlock_bh(lock);
1013                 res = 0;
1014                 for (idx = 0; idx < accum; idx++) {
1015                         if (res >= 0) {
1016                                 res = sk_diag_fill(sk_arr[idx], skb, r,
1017                                            sk_user_ns(NETLINK_CB(cb->skb).sk),
1018                                            NETLINK_CB(cb->skb).portid,
1019                                            cb->nlh->nlmsg_seq, NLM_F_MULTI,
1020                                            cb->nlh, net_admin);
1021                                 if (res < 0)
1022                                         num = num_arr[idx];
1023                         }
1024                         sock_gen_put(sk_arr[idx]);
1025                 }
1026                 if (res < 0)
1027                         break;
1028                 cond_resched();
1029                 if (accum == SKARR_SZ) {
1030                         s_num = num + 1;
1031                         goto next_chunk;
1032                 }
1033         }
1034
1035 done:
1036         cb->args[1] = i;
1037         cb->args[2] = num;
1038 out:
1039         ;
1040 }
1041 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
1042
1043 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
1044                             const struct inet_diag_req_v2 *r,
1045                             struct nlattr *bc)
1046 {
1047         const struct inet_diag_handler *handler;
1048         int err = 0;
1049
1050         handler = inet_diag_lock_handler(r->sdiag_protocol);
1051         if (!IS_ERR(handler))
1052                 handler->dump(skb, cb, r, bc);
1053         else
1054                 err = PTR_ERR(handler);
1055         inet_diag_unlock_handler(handler);
1056
1057         return err ? : skb->len;
1058 }
1059
1060 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
1061 {
1062         int hdrlen = sizeof(struct inet_diag_req_v2);
1063         struct nlattr *bc = NULL;
1064
1065         if (nlmsg_attrlen(cb->nlh, hdrlen))
1066                 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1067
1068         return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
1069 }
1070
1071 static int inet_diag_type2proto(int type)
1072 {
1073         switch (type) {
1074         case TCPDIAG_GETSOCK:
1075                 return IPPROTO_TCP;
1076         case DCCPDIAG_GETSOCK:
1077                 return IPPROTO_DCCP;
1078         default:
1079                 return 0;
1080         }
1081 }
1082
1083 static int inet_diag_dump_compat(struct sk_buff *skb,
1084                                  struct netlink_callback *cb)
1085 {
1086         struct inet_diag_req *rc = nlmsg_data(cb->nlh);
1087         int hdrlen = sizeof(struct inet_diag_req);
1088         struct inet_diag_req_v2 req;
1089         struct nlattr *bc = NULL;
1090
1091         req.sdiag_family = AF_UNSPEC; /* compatibility */
1092         req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1093         req.idiag_ext = rc->idiag_ext;
1094         req.idiag_states = rc->idiag_states;
1095         req.id = rc->id;
1096
1097         if (nlmsg_attrlen(cb->nlh, hdrlen))
1098                 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1099
1100         return __inet_diag_dump(skb, cb, &req, bc);
1101 }
1102
1103 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1104                                       const struct nlmsghdr *nlh)
1105 {
1106         struct inet_diag_req *rc = nlmsg_data(nlh);
1107         struct inet_diag_req_v2 req;
1108
1109         req.sdiag_family = rc->idiag_family;
1110         req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1111         req.idiag_ext = rc->idiag_ext;
1112         req.idiag_states = rc->idiag_states;
1113         req.id = rc->id;
1114
1115         return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req);
1116 }
1117
1118 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1119 {
1120         int hdrlen = sizeof(struct inet_diag_req);
1121         struct net *net = sock_net(skb->sk);
1122
1123         if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1124             nlmsg_len(nlh) < hdrlen)
1125                 return -EINVAL;
1126
1127         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1128                 if (nlmsg_attrlen(nlh, hdrlen)) {
1129                         struct nlattr *attr;
1130                         int err;
1131
1132                         attr = nlmsg_find_attr(nlh, hdrlen,
1133                                                INET_DIAG_REQ_BYTECODE);
1134                         err = inet_diag_bc_audit(attr, skb);
1135                         if (err)
1136                                 return err;
1137                 }
1138                 {
1139                         struct netlink_dump_control c = {
1140                                 .dump = inet_diag_dump_compat,
1141                         };
1142                         return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1143                 }
1144         }
1145
1146         return inet_diag_get_exact_compat(skb, nlh);
1147 }
1148
1149 static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
1150 {
1151         int hdrlen = sizeof(struct inet_diag_req_v2);
1152         struct net *net = sock_net(skb->sk);
1153
1154         if (nlmsg_len(h) < hdrlen)
1155                 return -EINVAL;
1156
1157         if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1158             h->nlmsg_flags & NLM_F_DUMP) {
1159                 if (nlmsg_attrlen(h, hdrlen)) {
1160                         struct nlattr *attr;
1161                         int err;
1162
1163                         attr = nlmsg_find_attr(h, hdrlen,
1164                                                INET_DIAG_REQ_BYTECODE);
1165                         err = inet_diag_bc_audit(attr, skb);
1166                         if (err)
1167                                 return err;
1168                 }
1169                 {
1170                         struct netlink_dump_control c = {
1171                                 .dump = inet_diag_dump,
1172                         };
1173                         return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1174                 }
1175         }
1176
1177         return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h));
1178 }
1179
1180 static
1181 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1182 {
1183         const struct inet_diag_handler *handler;
1184         struct nlmsghdr *nlh;
1185         struct nlattr *attr;
1186         struct inet_diag_msg *r;
1187         void *info = NULL;
1188         int err = 0;
1189
1190         nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1191         if (!nlh)
1192                 return -ENOMEM;
1193
1194         r = nlmsg_data(nlh);
1195         memset(r, 0, sizeof(*r));
1196         inet_diag_msg_common_fill(r, sk);
1197         if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1198                 r->id.idiag_sport = inet_sk(sk)->inet_sport;
1199         r->idiag_state = sk->sk_state;
1200
1201         if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1202                 nlmsg_cancel(skb, nlh);
1203                 return err;
1204         }
1205
1206         handler = inet_diag_lock_handler(sk->sk_protocol);
1207         if (IS_ERR(handler)) {
1208                 inet_diag_unlock_handler(handler);
1209                 nlmsg_cancel(skb, nlh);
1210                 return PTR_ERR(handler);
1211         }
1212
1213         attr = handler->idiag_info_size
1214                 ? nla_reserve_64bit(skb, INET_DIAG_INFO,
1215                                     handler->idiag_info_size,
1216                                     INET_DIAG_PAD)
1217                 : NULL;
1218         if (attr)
1219                 info = nla_data(attr);
1220
1221         handler->idiag_get_info(sk, r, info);
1222         inet_diag_unlock_handler(handler);
1223
1224         nlmsg_end(skb, nlh);
1225         return 0;
1226 }
1227
1228 static const struct sock_diag_handler inet_diag_handler = {
1229         .family = AF_INET,
1230         .dump = inet_diag_handler_cmd,
1231         .get_info = inet_diag_handler_get_info,
1232         .destroy = inet_diag_handler_cmd,
1233 };
1234
1235 static const struct sock_diag_handler inet6_diag_handler = {
1236         .family = AF_INET6,
1237         .dump = inet_diag_handler_cmd,
1238         .get_info = inet_diag_handler_get_info,
1239         .destroy = inet_diag_handler_cmd,
1240 };
1241
1242 int inet_diag_register(const struct inet_diag_handler *h)
1243 {
1244         const __u16 type = h->idiag_type;
1245         int err = -EINVAL;
1246
1247         if (type >= IPPROTO_MAX)
1248                 goto out;
1249
1250         mutex_lock(&inet_diag_table_mutex);
1251         err = -EEXIST;
1252         if (!inet_diag_table[type]) {
1253                 inet_diag_table[type] = h;
1254                 err = 0;
1255         }
1256         mutex_unlock(&inet_diag_table_mutex);
1257 out:
1258         return err;
1259 }
1260 EXPORT_SYMBOL_GPL(inet_diag_register);
1261
1262 void inet_diag_unregister(const struct inet_diag_handler *h)
1263 {
1264         const __u16 type = h->idiag_type;
1265
1266         if (type >= IPPROTO_MAX)
1267                 return;
1268
1269         mutex_lock(&inet_diag_table_mutex);
1270         inet_diag_table[type] = NULL;
1271         mutex_unlock(&inet_diag_table_mutex);
1272 }
1273 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1274
1275 static int __init inet_diag_init(void)
1276 {
1277         const int inet_diag_table_size = (IPPROTO_MAX *
1278                                           sizeof(struct inet_diag_handler *));
1279         int err = -ENOMEM;
1280
1281         inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1282         if (!inet_diag_table)
1283                 goto out;
1284
1285         err = sock_diag_register(&inet_diag_handler);
1286         if (err)
1287                 goto out_free_nl;
1288
1289         err = sock_diag_register(&inet6_diag_handler);
1290         if (err)
1291                 goto out_free_inet;
1292
1293         sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1294 out:
1295         return err;
1296
1297 out_free_inet:
1298         sock_diag_unregister(&inet_diag_handler);
1299 out_free_nl:
1300         kfree(inet_diag_table);
1301         goto out;
1302 }
1303
1304 static void __exit inet_diag_exit(void)
1305 {
1306         sock_diag_unregister(&inet6_diag_handler);
1307         sock_diag_unregister(&inet_diag_handler);
1308         sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1309         kfree(inet_diag_table);
1310 }
1311
1312 module_init(inet_diag_init);
1313 module_exit(inet_diag_exit);
1314 MODULE_LICENSE("GPL");
1315 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1316 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);