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/bpf_sk_storage.h>
  27 #include <net/netlink.h>
  28
  29 #include <linux/inet.h>
  30 #include <linux/stddef.h>
  31
  32 #include <linux/inet_diag.h>
  33 #include <linux/sock_diag.h>
  34
  35 static const struct inet_diag_handler **inet_diag_table;
  36
  37 struct inet_diag_entry {
  38         const __be32 *saddr;
  39         const __be32 *daddr;
  40         u16 sport;
  41         u16 dport;
  42         u16 family;
  43         u16 userlocks;
  44         u32 ifindex;
  45         u32 mark;
  46 #ifdef CONFIG_SOCK_CGROUP_DATA
  47         u64 cgroup_id;
  48 #endif
  49 };
  50
  51 static DEFINE_MUTEX(inet_diag_table_mutex);
  52
  53 static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
  54 {
  55         if (proto < 0 || proto >= IPPROTO_MAX) {
  56                 mutex_lock(&inet_diag_table_mutex);
  57                 return ERR_PTR(-ENOENT);
  58         }
  59
  60         if (!inet_diag_table[proto])
  61                 sock_load_diag_module(AF_INET, proto);
  62
  63         mutex_lock(&inet_diag_table_mutex);
  64         if (!inet_diag_table[proto])
  65                 return ERR_PTR(-ENOENT);
  66
  67         return inet_diag_table[proto];
  68 }
  69
  70 static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
  71 {
  72         mutex_unlock(&inet_diag_table_mutex);
  73 }
  74
  75 void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk)
  76 {
  77         r->idiag_family = sk->sk_family;
  78
  79         r->id.idiag_sport = htons(sk->sk_num);
  80         r->id.idiag_dport = sk->sk_dport;
  81         r->id.idiag_if = sk->sk_bound_dev_if;
  82         sock_diag_save_cookie(sk, r->id.idiag_cookie);
  83
  84 #if IS_ENABLED(CONFIG_IPV6)
  85         if (sk->sk_family == AF_INET6) {
  86                 *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
  87                 *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
  88         } else
  89 #endif
  90         {
  91         memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
  92         memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
  93
  94         r->id.idiag_src[0] = sk->sk_rcv_saddr;
  95         r->id.idiag_dst[0] = sk->sk_daddr;
  96         }
  97 }
  98 EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill);
  99
 100 static size_t inet_sk_attr_size(struct sock *sk,
 101                                 const struct inet_diag_req_v2 *req,
 102                                 bool net_admin)
 103 {
 104         const struct inet_diag_handler *handler;
 105         size_t aux = 0;
 106
 107         handler = inet_diag_table[req->sdiag_protocol];
 108         if (handler && handler->idiag_get_aux_size)
 109                 aux = handler->idiag_get_aux_size(sk, net_admin);
 110
 111         return    nla_total_size(sizeof(struct tcp_info))
 112                 + nla_total_size(sizeof(struct inet_diag_msg))
 113                 + inet_diag_msg_attrs_size()
 114                 + nla_total_size(sizeof(struct inet_diag_meminfo))
 115                 + nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
 116                 + nla_total_size(TCP_CA_NAME_MAX)
 117                 + nla_total_size(sizeof(struct tcpvegas_info))
 118                 + aux
 119                 + 64;
 120 }
 121
 122 int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
 123                              struct inet_diag_msg *r, int ext,
 124                              struct user_namespace *user_ns,
 125                              bool net_admin)
 126 {
 127         const struct inet_sock *inet = inet_sk(sk);
 128
 129         if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
 130                 goto errout;
 131
 132         /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
 133          * hence this needs to be included regardless of socket family.
 134          */
 135         if (ext & (1 << (INET_DIAG_TOS - 1)))
 136                 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
 137                         goto errout;
 138
 139 #if IS_ENABLED(CONFIG_IPV6)
 140         if (r->idiag_family == AF_INET6) {
 141                 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
 142                         if (nla_put_u8(skb, INET_DIAG_TCLASS,
 143                                        inet6_sk(sk)->tclass) < 0)
 144                                 goto errout;
 145
 146                 if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
 147                     nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
 148                         goto errout;
 149         }
 150 #endif
 151
 152         if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, sk->sk_mark))
 153                 goto errout;
 154
 155         if (ext & (1 << (INET_DIAG_CLASS_ID - 1)) ||
 156             ext & (1 << (INET_DIAG_TCLASS - 1))) {
 157                 u32 classid = 0;
 158
 159 #ifdef CONFIG_SOCK_CGROUP_DATA
 160                 classid = sock_cgroup_classid(&sk->sk_cgrp_data);
 161 #endif
 162                 /* Fallback to socket priority if class id isn't set.
 163                  * Classful qdiscs use it as direct reference to class.
 164                  * For cgroup2 classid is always zero.
 165                  */
 166                 if (!classid)
 167                         classid = sk->sk_priority;
 168
 169                 if (nla_put_u32(skb, INET_DIAG_CLASS_ID, classid))
 170                         goto errout;
 171         }
 172
 173 #ifdef CONFIG_SOCK_CGROUP_DATA
 174         if (nla_put_u64_64bit(skb, INET_DIAG_CGROUP_ID,
 175                               cgroup_id(sock_cgroup_ptr(&sk->sk_cgrp_data)),
 176                               INET_DIAG_PAD))
 177                 goto errout;
 178 #endif
 179
 180         r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
 181         r->idiag_inode = sock_i_ino(sk);
 182
 183         return 0;
 184 errout:
 185         return 1;
 186 }
 187 EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill);
 188
 189 static int inet_diag_parse_attrs(const struct nlmsghdr *nlh, int hdrlen,
 190                                  struct nlattr **req_nlas)
 191 {
 192         struct nlattr *nla;
 193         int remaining;
 194
 195         nlmsg_for_each_attr(nla, nlh, hdrlen, remaining) {
 196                 int type = nla_type(nla);
 197
 198                 if (type == INET_DIAG_REQ_PROTOCOL && nla_len(nla) != sizeof(u32))
 199                         return -EINVAL;
 200
 201                 if (type < __INET_DIAG_REQ_MAX)
 202                         req_nlas[type] = nla;
 203         }
 204         return 0;
 205 }
 206
 207 static int inet_diag_get_protocol(const struct inet_diag_req_v2 *req,
 208                                   const struct inet_diag_dump_data *data)
 209 {
 210         if (data->req_nlas[INET_DIAG_REQ_PROTOCOL])
 211                 return nla_get_u32(data->req_nlas[INET_DIAG_REQ_PROTOCOL]);
 212         return req->sdiag_protocol;
 213 }
 214
 215 #define MAX_DUMP_ALLOC_SIZE (KMALLOC_MAX_SIZE - SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
 216
 217 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
 218                       struct sk_buff *skb, struct netlink_callback *cb,
 219                       const struct inet_diag_req_v2 *req,
 220                       u16 nlmsg_flags, bool net_admin)
 221 {
 222         const struct tcp_congestion_ops *ca_ops;
 223         const struct inet_diag_handler *handler;
 224         struct inet_diag_dump_data *cb_data;
 225         int ext = req->idiag_ext;
 226         struct inet_diag_msg *r;
 227         struct nlmsghdr  *nlh;
 228         struct nlattr *attr;
 229         void *info = NULL;
 230
 231         cb_data = cb->data;
 232         handler = inet_diag_table[inet_diag_get_protocol(req, cb_data)];
 233         BUG_ON(!handler);
 234
 235         nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
 236                         cb->nlh->nlmsg_type, sizeof(*r), nlmsg_flags);
 237         if (!nlh)
 238                 return -EMSGSIZE;
 239
 240         r = nlmsg_data(nlh);
 241         BUG_ON(!sk_fullsock(sk));
 242
 243         inet_diag_msg_common_fill(r, sk);
 244         r->idiag_state = sk->sk_state;
 245         r->idiag_timer = 0;
 246         r->idiag_retrans = 0;
 247
 248         if (inet_diag_msg_attrs_fill(sk, skb, r, ext,
 249                                      sk_user_ns(NETLINK_CB(cb->skb).sk),
 250                                      net_admin))
 251                 goto errout;
 252
 253         if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
 254                 struct inet_diag_meminfo minfo = {
 255                         .idiag_rmem = sk_rmem_alloc_get(sk),
 256                         .idiag_wmem = READ_ONCE(sk->sk_wmem_queued),
 257                         .idiag_fmem = sk->sk_forward_alloc,
 258                         .idiag_tmem = sk_wmem_alloc_get(sk),
 259                 };
 260
 261                 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
 262                         goto errout;
 263         }
 264
 265         if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
 266                 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
 267                         goto errout;
 268
 269         /*
 270          * RAW sockets might have user-defined protocols assigned,
 271          * so report the one supplied on socket creation.
 272          */
 273         if (sk->sk_type == SOCK_RAW) {
 274                 if (nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))
 275                         goto errout;
 276         }
 277
 278         if (!icsk) {
 279                 handler->idiag_get_info(sk, r, NULL);
 280                 goto out;
 281         }
 282
 283         if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
 284             icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT ||
 285             icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
 286                 r->idiag_timer = 1;
 287                 r->idiag_retrans = icsk->icsk_retransmits;
 288                 r->idiag_expires =
 289                         jiffies_delta_to_msecs(icsk->icsk_timeout - jiffies);
 290         } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
 291                 r->idiag_timer = 4;
 292                 r->idiag_retrans = icsk->icsk_probes_out;
 293                 r->idiag_expires =
 294                         jiffies_delta_to_msecs(icsk->icsk_timeout - jiffies);
 295         } else if (timer_pending(&sk->sk_timer)) {
 296                 r->idiag_timer = 2;
 297                 r->idiag_retrans = icsk->icsk_probes_out;
 298                 r->idiag_expires =
 299                         jiffies_delta_to_msecs(sk->sk_timer.expires - jiffies);
 300         } else {
 301                 r->idiag_timer = 0;
 302                 r->idiag_expires = 0;
 303         }
 304
 305         if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
 306                 attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
 307                                          handler->idiag_info_size,
 308                                          INET_DIAG_PAD);
 309                 if (!attr)
 310                         goto errout;
 311
 312                 info = nla_data(attr);
 313         }
 314
 315         if (ext & (1 << (INET_DIAG_CONG - 1))) {
 316                 int err = 0;
 317
 318                 rcu_read_lock();
 319                 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
 320                 if (ca_ops)
 321                         err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
 322                 rcu_read_unlock();
 323                 if (err < 0)
 324                         goto errout;
 325         }
 326
 327         handler->idiag_get_info(sk, r, info);
 328
 329         if (ext & (1 << (INET_DIAG_INFO - 1)) && handler->idiag_get_aux)
 330                 if (handler->idiag_get_aux(sk, net_admin, skb) < 0)
 331                         goto errout;
 332
 333         if (sk->sk_state < TCP_TIME_WAIT) {
 334                 union tcp_cc_info info;
 335                 size_t sz = 0;
 336                 int attr;
 337
 338                 rcu_read_lock();
 339                 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
 340                 if (ca_ops && ca_ops->get_info)
 341                         sz = ca_ops->get_info(sk, ext, &attr, &info);
 342                 rcu_read_unlock();
 343                 if (sz && nla_put(skb, attr, sz, &info) < 0)
 344                         goto errout;
 345         }
 346
 347         /* Keep it at the end for potential retry with a larger skb,
 348          * or else do best-effort fitting, which is only done for the
 349          * first_nlmsg.
 350          */
 351         if (cb_data->bpf_stg_diag) {
 352                 bool first_nlmsg = ((unsigned char *)nlh == skb->data);
 353                 unsigned int prev_min_dump_alloc;
 354                 unsigned int total_nla_size = 0;
 355                 unsigned int msg_len;
 356                 int err;
 357
 358                 msg_len = skb_tail_pointer(skb) - (unsigned char *)nlh;
 359                 err = bpf_sk_storage_diag_put(cb_data->bpf_stg_diag, sk, skb,
 360                                               INET_DIAG_SK_BPF_STORAGES,
 361                                               &total_nla_size);
 362
 363                 if (!err)
 364                         goto out;
 365
 366                 total_nla_size += msg_len;
 367                 prev_min_dump_alloc = cb->min_dump_alloc;
 368                 if (total_nla_size > prev_min_dump_alloc)
 369                         cb->min_dump_alloc = min_t(u32, total_nla_size,
 370                                                    MAX_DUMP_ALLOC_SIZE);
 371
 372                 if (!first_nlmsg)
 373                         goto errout;
 374
 375                 if (cb->min_dump_alloc > prev_min_dump_alloc)
 376                         /* Retry with pskb_expand_head() with
 377                          * __GFP_DIRECT_RECLAIM
 378                          */
 379                         goto errout;
 380
 381                 WARN_ON_ONCE(total_nla_size <= prev_min_dump_alloc);
 382
 383                 /* Send what we have for this sk
 384                  * and move on to the next sk in the following
 385                  * dump()
 386                  */
 387         }
 388
 389 out:
 390         nlmsg_end(skb, nlh);
 391         return 0;
 392
 393 errout:
 394         nlmsg_cancel(skb, nlh);
 395         return -EMSGSIZE;
 396 }
 397 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
 398
 399 static int inet_twsk_diag_fill(struct sock *sk,
 400                                struct sk_buff *skb,
 401                                struct netlink_callback *cb,
 402                                u16 nlmsg_flags)
 403 {
 404         struct inet_timewait_sock *tw = inet_twsk(sk);
 405         struct inet_diag_msg *r;
 406         struct nlmsghdr *nlh;
 407         long tmo;
 408
 409         nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
 410                         cb->nlh->nlmsg_seq, cb->nlh->nlmsg_type,
 411                         sizeof(*r), nlmsg_flags);
 412         if (!nlh)
 413                 return -EMSGSIZE;
 414
 415         r = nlmsg_data(nlh);
 416         BUG_ON(tw->tw_state != TCP_TIME_WAIT);
 417
 418         inet_diag_msg_common_fill(r, sk);
 419         r->idiag_retrans      = 0;
 420
 421         r->idiag_state        = tw->tw_substate;
 422         r->idiag_timer        = 3;
 423         tmo = tw->tw_timer.expires - jiffies;
 424         r->idiag_expires      = jiffies_delta_to_msecs(tmo);
 425         r->idiag_rqueue       = 0;
 426         r->idiag_wqueue       = 0;
 427         r->idiag_uid          = 0;
 428         r->idiag_inode        = 0;
 429
 430         nlmsg_end(skb, nlh);
 431         return 0;
 432 }
 433
 434 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
 435                               struct netlink_callback *cb,
 436                               u16 nlmsg_flags, bool net_admin)
 437 {
 438         struct request_sock *reqsk = inet_reqsk(sk);
 439         struct inet_diag_msg *r;
 440         struct nlmsghdr *nlh;
 441         long tmo;
 442
 443         nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
 444                         cb->nlh->nlmsg_type, sizeof(*r), nlmsg_flags);
 445         if (!nlh)
 446                 return -EMSGSIZE;
 447
 448         r = nlmsg_data(nlh);
 449         inet_diag_msg_common_fill(r, sk);
 450         r->idiag_state = TCP_SYN_RECV;
 451         r->idiag_timer = 1;
 452         r->idiag_retrans = reqsk->num_retrans;
 453
 454         BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
 455                      offsetof(struct sock, sk_cookie));
 456
 457         tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
 458         r->idiag_expires = jiffies_delta_to_msecs(tmo);
 459         r->idiag_rqueue = 0;
 460         r->idiag_wqueue = 0;
 461         r->idiag_uid    = 0;
 462         r->idiag_inode  = 0;
 463
 464         if (net_admin && nla_put_u32(skb, INET_DIAG_MARK,
 465                                      inet_rsk(reqsk)->ir_mark))
 466                 return -EMSGSIZE;
 467
 468         nlmsg_end(skb, nlh);
 469         return 0;
 470 }
 471
 472 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
 473                         struct netlink_callback *cb,
 474                         const struct inet_diag_req_v2 *r,
 475                         u16 nlmsg_flags, bool net_admin)
 476 {
 477         if (sk->sk_state == TCP_TIME_WAIT)
 478                 return inet_twsk_diag_fill(sk, skb, cb, nlmsg_flags);
 479
 480         if (sk->sk_state == TCP_NEW_SYN_RECV)
 481                 return inet_req_diag_fill(sk, skb, cb, nlmsg_flags, net_admin);
 482
 483         return inet_sk_diag_fill(sk, inet_csk(sk), skb, cb, r, nlmsg_flags,
 484                                  net_admin);
 485 }
 486
 487 struct sock *inet_diag_find_one_icsk(struct net *net,
 488                                      struct inet_hashinfo *hashinfo,
 489                                      const struct inet_diag_req_v2 *req)
 490 {
 491         struct sock *sk;
 492
 493         rcu_read_lock();
 494         if (req->sdiag_family == AF_INET)
 495                 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
 496                                  req->id.idiag_dport, req->id.idiag_src[0],
 497                                  req->id.idiag_sport, req->id.idiag_if);
 498 #if IS_ENABLED(CONFIG_IPV6)
 499         else if (req->sdiag_family == AF_INET6) {
 500                 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
 501                     ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
 502                         sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
 503                                          req->id.idiag_dport, req->id.idiag_src[3],
 504                                          req->id.idiag_sport, req->id.idiag_if);
 505                 else
 506                         sk = inet6_lookup(net, hashinfo, NULL, 0,
 507                                           (struct in6_addr *)req->id.idiag_dst,
 508                                           req->id.idiag_dport,
 509                                           (struct in6_addr *)req->id.idiag_src,
 510                                           req->id.idiag_sport,
 511                                           req->id.idiag_if);
 512         }
 513 #endif
 514         else {
 515                 rcu_read_unlock();
 516                 return ERR_PTR(-EINVAL);
 517         }
 518         rcu_read_unlock();
 519         if (!sk)
 520                 return ERR_PTR(-ENOENT);
 521
 522         if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
 523                 sock_gen_put(sk);
 524                 return ERR_PTR(-ENOENT);
 525         }
 526
 527         return sk;
 528 }
 529 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
 530
 531 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
 532                             struct netlink_callback *cb,
 533                             const struct inet_diag_req_v2 *req)
 534 {
 535         struct sk_buff *in_skb = cb->skb;
 536         bool net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN);
 537         struct net *net = sock_net(in_skb->sk);
 538         struct sk_buff *rep;
 539         struct sock *sk;
 540         int err;
 541
 542         sk = inet_diag_find_one_icsk(net, hashinfo, req);
 543         if (IS_ERR(sk))
 544                 return PTR_ERR(sk);
 545
 546         rep = nlmsg_new(inet_sk_attr_size(sk, req, net_admin), GFP_KERNEL);
 547         if (!rep) {
 548                 err = -ENOMEM;
 549                 goto out;
 550         }
 551
 552         err = sk_diag_fill(sk, rep, cb, req, 0, net_admin);
 553         if (err < 0) {
 554                 WARN_ON(err == -EMSGSIZE);
 555                 nlmsg_free(rep);
 556                 goto out;
 557         }
 558         err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
 559                               MSG_DONTWAIT);
 560         if (err > 0)
 561                 err = 0;
 562
 563 out:
 564         if (sk)
 565                 sock_gen_put(sk);
 566
 567         return err;
 568 }
 569 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
 570
 571 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
 572                                const struct nlmsghdr *nlh,
 573                                int hdrlen,
 574                                const struct inet_diag_req_v2 *req)
 575 {
 576         const struct inet_diag_handler *handler;
 577         struct inet_diag_dump_data dump_data;
 578         int err, protocol;
 579
 580         memset(&dump_data, 0, sizeof(dump_data));
 581         err = inet_diag_parse_attrs(nlh, hdrlen, dump_data.req_nlas);
 582         if (err)
 583                 return err;
 584
 585         protocol = inet_diag_get_protocol(req, &dump_data);
 586
 587         handler = inet_diag_lock_handler(protocol);
 588         if (IS_ERR(handler)) {
 589                 err = PTR_ERR(handler);
 590         } else if (cmd == SOCK_DIAG_BY_FAMILY) {
 591                 struct netlink_callback cb = {
 592                         .nlh = nlh,
 593                         .skb = in_skb,
 594                         .data = &dump_data,
 595                 };
 596                 err = handler->dump_one(&cb, req);
 597         } else if (cmd == SOCK_DESTROY && handler->destroy) {
 598                 err = handler->destroy(in_skb, req);
 599         } else {
 600                 err = -EOPNOTSUPP;
 601         }
 602         inet_diag_unlock_handler(handler);
 603
 604         return err;
 605 }
 606
 607 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
 608 {
 609         int words = bits >> 5;
 610
 611         bits &= 0x1f;
 612
 613         if (words) {
 614                 if (memcmp(a1, a2, words << 2))
 615                         return 0;
 616         }
 617         if (bits) {
 618                 __be32 w1, w2;
 619                 __be32 mask;
 620
 621                 w1 = a1[words];
 622                 w2 = a2[words];
 623
 624                 mask = htonl((0xffffffff) << (32 - bits));
 625
 626                 if ((w1 ^ w2) & mask)
 627                         return 0;
 628         }
 629
 630         return 1;
 631 }
 632
 633 static int inet_diag_bc_run(const struct nlattr *_bc,
 634                             const struct inet_diag_entry *entry)
 635 {
 636         const void *bc = nla_data(_bc);
 637         int len = nla_len(_bc);
 638
 639         while (len > 0) {
 640                 int yes = 1;
 641                 const struct inet_diag_bc_op *op = bc;
 642
 643                 switch (op->code) {
 644                 case INET_DIAG_BC_NOP:
 645                         break;
 646                 case INET_DIAG_BC_JMP:
 647                         yes = 0;
 648                         break;
 649                 case INET_DIAG_BC_S_EQ:
 650                         yes = entry->sport == op[1].no;
 651                         break;
 652                 case INET_DIAG_BC_S_GE:
 653                         yes = entry->sport >= op[1].no;
 654                         break;
 655                 case INET_DIAG_BC_S_LE:
 656                         yes = entry->sport <= op[1].no;
 657                         break;
 658                 case INET_DIAG_BC_D_EQ:
 659                         yes = entry->dport == op[1].no;
 660                         break;
 661                 case INET_DIAG_BC_D_GE:
 662                         yes = entry->dport >= op[1].no;
 663                         break;
 664                 case INET_DIAG_BC_D_LE:
 665                         yes = entry->dport <= op[1].no;
 666                         break;
 667                 case INET_DIAG_BC_AUTO:
 668                         yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
 669                         break;
 670                 case INET_DIAG_BC_S_COND:
 671                 case INET_DIAG_BC_D_COND: {
 672                         const struct inet_diag_hostcond *cond;
 673                         const __be32 *addr;
 674
 675                         cond = (const struct inet_diag_hostcond *)(op + 1);
 676                         if (cond->port != -1 &&
 677                             cond->port != (op->code == INET_DIAG_BC_S_COND ?
 678                                              entry->sport : entry->dport)) {
 679                                 yes = 0;
 680                                 break;
 681                         }
 682
 683                         if (op->code == INET_DIAG_BC_S_COND)
 684                                 addr = entry->saddr;
 685                         else
 686                                 addr = entry->daddr;
 687
 688                         if (cond->family != AF_UNSPEC &&
 689                             cond->family != entry->family) {
 690                                 if (entry->family == AF_INET6 &&
 691                                     cond->family == AF_INET) {
 692                                         if (addr[0] == 0 && addr[1] == 0 &&
 693                                             addr[2] == htonl(0xffff) &&
 694                                             bitstring_match(addr + 3,
 695                                                             cond->addr,
 696                                                             cond->prefix_len))
 697                                                 break;
 698                                 }
 699                                 yes = 0;
 700                                 break;
 701                         }
 702
 703                         if (cond->prefix_len == 0)
 704                                 break;
 705                         if (bitstring_match(addr, cond->addr,
 706                                             cond->prefix_len))
 707                                 break;
 708                         yes = 0;
 709                         break;
 710                 }
 711                 case INET_DIAG_BC_DEV_COND: {
 712                         u32 ifindex;
 713
 714                         ifindex = *((const u32 *)(op + 1));
 715                         if (ifindex != entry->ifindex)
 716                                 yes = 0;
 717                         break;
 718                 }
 719                 case INET_DIAG_BC_MARK_COND: {
 720                         struct inet_diag_markcond *cond;
 721
 722                         cond = (struct inet_diag_markcond *)(op + 1);
 723                         if ((entry->mark & cond->mask) != cond->mark)
 724                                 yes = 0;
 725                         break;
 726                 }
 727 #ifdef CONFIG_SOCK_CGROUP_DATA
 728                 case INET_DIAG_BC_CGROUP_COND: {
 729                         u64 cgroup_id;
 730
 731                         cgroup_id = get_unaligned((const u64 *)(op + 1));
 732                         if (cgroup_id != entry->cgroup_id)
 733                                 yes = 0;
 734                         break;
 735                 }
 736 #endif
 737                 }
 738
 739                 if (yes) {
 740                         len -= op->yes;
 741                         bc += op->yes;
 742                 } else {
 743                         len -= op->no;
 744                         bc += op->no;
 745                 }
 746         }
 747         return len == 0;
 748 }
 749
 750 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
 751  */
 752 static void entry_fill_addrs(struct inet_diag_entry *entry,
 753                              const struct sock *sk)
 754 {
 755 #if IS_ENABLED(CONFIG_IPV6)
 756         if (sk->sk_family == AF_INET6) {
 757                 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
 758                 entry->daddr = sk->sk_v6_daddr.s6_addr32;
 759         } else
 760 #endif
 761         {
 762                 entry->saddr = &sk->sk_rcv_saddr;
 763                 entry->daddr = &sk->sk_daddr;
 764         }
 765 }
 766
 767 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
 768 {
 769         struct inet_sock *inet = inet_sk(sk);
 770         struct inet_diag_entry entry;
 771
 772         if (!bc)
 773                 return 1;
 774
 775         entry.family = sk->sk_family;
 776         entry_fill_addrs(&entry, sk);
 777         entry.sport = inet->inet_num;
 778         entry.dport = ntohs(inet->inet_dport);
 779         entry.ifindex = sk->sk_bound_dev_if;
 780         entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
 781         if (sk_fullsock(sk))
 782                 entry.mark = sk->sk_mark;
 783         else if (sk->sk_state == TCP_NEW_SYN_RECV)
 784                 entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark;
 785         else
 786                 entry.mark = 0;
 787 #ifdef CONFIG_SOCK_CGROUP_DATA
 788         entry.cgroup_id = sk_fullsock(sk) ?
 789                 cgroup_id(sock_cgroup_ptr(&sk->sk_cgrp_data)) : 0;
 790 #endif
 791
 792         return inet_diag_bc_run(bc, &entry);
 793 }
 794 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
 795
 796 static int valid_cc(const void *bc, int len, int cc)
 797 {
 798         while (len >= 0) {
 799                 const struct inet_diag_bc_op *op = bc;
 800
 801                 if (cc > len)
 802                         return 0;
 803                 if (cc == len)
 804                         return 1;
 805                 if (op->yes < 4 || op->yes & 3)
 806                         return 0;
 807                 len -= op->yes;
 808                 bc  += op->yes;
 809         }
 810         return 0;
 811 }
 812
 813 /* data is u32 ifindex */
 814 static bool valid_devcond(const struct inet_diag_bc_op *op, int len,
 815                           int *min_len)
 816 {
 817         /* Check ifindex space. */
 818         *min_len += sizeof(u32);
 819         if (len < *min_len)
 820                 return false;
 821
 822         return true;
 823 }
 824 /* Validate an inet_diag_hostcond. */
 825 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
 826                            int *min_len)
 827 {
 828         struct inet_diag_hostcond *cond;
 829         int addr_len;
 830
 831         /* Check hostcond space. */
 832         *min_len += sizeof(struct inet_diag_hostcond);
 833         if (len < *min_len)
 834                 return false;
 835         cond = (struct inet_diag_hostcond *)(op + 1);
 836
 837         /* Check address family and address length. */
 838         switch (cond->family) {
 839         case AF_UNSPEC:
 840                 addr_len = 0;
 841                 break;
 842         case AF_INET:
 843                 addr_len = sizeof(struct in_addr);
 844                 break;
 845         case AF_INET6:
 846                 addr_len = sizeof(struct in6_addr);
 847                 break;
 848         default:
 849                 return false;
 850         }
 851         *min_len += addr_len;
 852         if (len < *min_len)
 853                 return false;
 854
 855         /* Check prefix length (in bits) vs address length (in bytes). */
 856         if (cond->prefix_len > 8 * addr_len)
 857                 return false;
 858
 859         return true;
 860 }
 861
 862 /* Validate a port comparison operator. */
 863 static bool valid_port_comparison(const struct inet_diag_bc_op *op,
 864                                   int len, int *min_len)
 865 {
 866         /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
 867         *min_len += sizeof(struct inet_diag_bc_op);
 868         if (len < *min_len)
 869                 return false;
 870         return true;
 871 }
 872
 873 static bool valid_markcond(const struct inet_diag_bc_op *op, int len,
 874                            int *min_len)
 875 {
 876         *min_len += sizeof(struct inet_diag_markcond);
 877         return len >= *min_len;
 878 }
 879
 880 #ifdef CONFIG_SOCK_CGROUP_DATA
 881 static bool valid_cgroupcond(const struct inet_diag_bc_op *op, int len,
 882                              int *min_len)
 883 {
 884         *min_len += sizeof(u64);
 885         return len >= *min_len;
 886 }
 887 #endif
 888
 889 static int inet_diag_bc_audit(const struct nlattr *attr,
 890                               const struct sk_buff *skb)
 891 {
 892         bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN);
 893         const void *bytecode, *bc;
 894         int bytecode_len, len;
 895
 896         if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op))
 897                 return -EINVAL;
 898
 899         bytecode = bc = nla_data(attr);
 900         len = bytecode_len = nla_len(attr);
 901
 902         while (len > 0) {
 903                 int min_len = sizeof(struct inet_diag_bc_op);
 904                 const struct inet_diag_bc_op *op = bc;
 905
 906                 switch (op->code) {
 907                 case INET_DIAG_BC_S_COND:
 908                 case INET_DIAG_BC_D_COND:
 909                         if (!valid_hostcond(bc, len, &min_len))
 910                                 return -EINVAL;
 911                         break;
 912                 case INET_DIAG_BC_DEV_COND:
 913                         if (!valid_devcond(bc, len, &min_len))
 914                                 return -EINVAL;
 915                         break;
 916                 case INET_DIAG_BC_S_EQ:
 917                 case INET_DIAG_BC_S_GE:
 918                 case INET_DIAG_BC_S_LE:
 919                 case INET_DIAG_BC_D_EQ:
 920                 case INET_DIAG_BC_D_GE:
 921                 case INET_DIAG_BC_D_LE:
 922                         if (!valid_port_comparison(bc, len, &min_len))
 923                                 return -EINVAL;
 924                         break;
 925                 case INET_DIAG_BC_MARK_COND:
 926                         if (!net_admin)
 927                                 return -EPERM;
 928                         if (!valid_markcond(bc, len, &min_len))
 929                                 return -EINVAL;
 930                         break;
 931 #ifdef CONFIG_SOCK_CGROUP_DATA
 932                 case INET_DIAG_BC_CGROUP_COND:
 933                         if (!valid_cgroupcond(bc, len, &min_len))
 934                                 return -EINVAL;
 935                         break;
 936 #endif
 937                 case INET_DIAG_BC_AUTO:
 938                 case INET_DIAG_BC_JMP:
 939                 case INET_DIAG_BC_NOP:
 940                         break;
 941                 default:
 942                         return -EINVAL;
 943                 }
 944
 945                 if (op->code != INET_DIAG_BC_NOP) {
 946                         if (op->no < min_len || op->no > len + 4 || op->no & 3)
 947                                 return -EINVAL;
 948                         if (op->no < len &&
 949                             !valid_cc(bytecode, bytecode_len, len - op->no))
 950                                 return -EINVAL;
 951                 }
 952
 953                 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
 954                         return -EINVAL;
 955                 bc  += op->yes;
 956                 len -= op->yes;
 957         }
 958         return len == 0 ? 0 : -EINVAL;
 959 }
 960
 961 static void twsk_build_assert(void)
 962 {
 963         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
 964                      offsetof(struct sock, sk_family));
 965
 966         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
 967                      offsetof(struct inet_sock, inet_num));
 968
 969         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
 970                      offsetof(struct inet_sock, inet_dport));
 971
 972         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
 973                      offsetof(struct inet_sock, inet_rcv_saddr));
 974
 975         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
 976                      offsetof(struct inet_sock, inet_daddr));
 977
 978 #if IS_ENABLED(CONFIG_IPV6)
 979         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
 980                      offsetof(struct sock, sk_v6_rcv_saddr));
 981
 982         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
 983                      offsetof(struct sock, sk_v6_daddr));
 984 #endif
 985 }
 986
 987 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
 988                          struct netlink_callback *cb,
 989                          const struct inet_diag_req_v2 *r)
 990 {
 991         bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
 992         struct inet_diag_dump_data *cb_data = cb->data;
 993         struct net *net = sock_net(skb->sk);
 994         u32 idiag_states = r->idiag_states;
 995         int i, num, s_i, s_num;
 996         struct nlattr *bc;
 997         struct sock *sk;
 998
 999         bc = cb_data->inet_diag_nla_bc;
1000         if (idiag_states & TCPF_SYN_RECV)
1001                 idiag_states |= TCPF_NEW_SYN_RECV;
1002         s_i = cb->args[1];
1003         s_num = num = cb->args[2];
1004
1005         if (cb->args[0] == 0) {
1006                 if (!(idiag_states & TCPF_LISTEN) || r->id.idiag_dport)
1007                         goto skip_listen_ht;
1008
1009                 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
1010                         struct inet_listen_hashbucket *ilb;
1011                         struct hlist_nulls_node *node;
1012
1013                         num = 0;
1014                         ilb = &hashinfo->listening_hash[i];
1015                         spin_lock(&ilb->lock);
1016                         sk_nulls_for_each(sk, node, &ilb->nulls_head) {
1017                                 struct inet_sock *inet = inet_sk(sk);
1018
1019                                 if (!net_eq(sock_net(sk), net))
1020                                         continue;
1021
1022                                 if (num < s_num) {
1023                                         num++;
1024                                         continue;
1025                                 }
1026
1027                                 if (r->sdiag_family != AF_UNSPEC &&
1028                                     sk->sk_family != r->sdiag_family)
1029                                         goto next_listen;
1030
1031                                 if (r->id.idiag_sport != inet->inet_sport &&
1032                                     r->id.idiag_sport)
1033                                         goto next_listen;
1034
1035                                 if (!inet_diag_bc_sk(bc, sk))
1036                                         goto next_listen;
1037
1038                                 if (inet_sk_diag_fill(sk, inet_csk(sk), skb,
1039                                                       cb, r, NLM_F_MULTI,
1040                                                       net_admin) < 0) {
1041                                         spin_unlock(&ilb->lock);
1042                                         goto done;
1043                                 }
1044
1045 next_listen:
1046                                 ++num;
1047                         }
1048                         spin_unlock(&ilb->lock);
1049
1050                         s_num = 0;
1051                 }
1052 skip_listen_ht:
1053                 cb->args[0] = 1;
1054                 s_i = num = s_num = 0;
1055         }
1056
1057         if (!(idiag_states & ~TCPF_LISTEN))
1058                 goto out;
1059
1060 #define SKARR_SZ 16
1061         for (i = s_i; i <= hashinfo->ehash_mask; i++) {
1062                 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
1063                 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
1064                 struct hlist_nulls_node *node;
1065                 struct sock *sk_arr[SKARR_SZ];
1066                 int num_arr[SKARR_SZ];
1067                 int idx, accum, res;
1068
1069                 if (hlist_nulls_empty(&head->chain))
1070                         continue;
1071
1072                 if (i > s_i)
1073                         s_num = 0;
1074
1075 next_chunk:
1076                 num = 0;
1077                 accum = 0;
1078                 spin_lock_bh(lock);
1079                 sk_nulls_for_each(sk, node, &head->chain) {
1080                         int state;
1081
1082                         if (!net_eq(sock_net(sk), net))
1083                                 continue;
1084                         if (num < s_num)
1085                                 goto next_normal;
1086                         state = (sk->sk_state == TCP_TIME_WAIT) ?
1087                                 inet_twsk(sk)->tw_substate : sk->sk_state;
1088                         if (!(idiag_states & (1 << state)))
1089                                 goto next_normal;
1090                         if (r->sdiag_family != AF_UNSPEC &&
1091                             sk->sk_family != r->sdiag_family)
1092                                 goto next_normal;
1093                         if (r->id.idiag_sport != htons(sk->sk_num) &&
1094                             r->id.idiag_sport)
1095                                 goto next_normal;
1096                         if (r->id.idiag_dport != sk->sk_dport &&
1097                             r->id.idiag_dport)
1098                                 goto next_normal;
1099                         twsk_build_assert();
1100
1101                         if (!inet_diag_bc_sk(bc, sk))
1102                                 goto next_normal;
1103
1104                         if (!refcount_inc_not_zero(&sk->sk_refcnt))
1105                                 goto next_normal;
1106
1107                         num_arr[accum] = num;
1108                         sk_arr[accum] = sk;
1109                         if (++accum == SKARR_SZ)
1110                                 break;
1111 next_normal:
1112                         ++num;
1113                 }
1114                 spin_unlock_bh(lock);
1115                 res = 0;
1116                 for (idx = 0; idx < accum; idx++) {
1117                         if (res >= 0) {
1118                                 res = sk_diag_fill(sk_arr[idx], skb, cb, r,
1119                                                    NLM_F_MULTI, net_admin);
1120                                 if (res < 0)
1121                                         num = num_arr[idx];
1122                         }
1123                         sock_gen_put(sk_arr[idx]);
1124                 }
1125                 if (res < 0)
1126                         break;
1127                 cond_resched();
1128                 if (accum == SKARR_SZ) {
1129                         s_num = num + 1;
1130                         goto next_chunk;
1131                 }
1132         }
1133
1134 done:
1135         cb->args[1] = i;
1136         cb->args[2] = num;
1137 out:
1138         ;
1139 }
1140 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
1141
1142 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
1143                             const struct inet_diag_req_v2 *r)
1144 {
1145         struct inet_diag_dump_data *cb_data = cb->data;
1146         const struct inet_diag_handler *handler;
1147         u32 prev_min_dump_alloc;
1148         int protocol, err = 0;
1149
1150         protocol = inet_diag_get_protocol(r, cb_data);
1151
1152 again:
1153         prev_min_dump_alloc = cb->min_dump_alloc;
1154         handler = inet_diag_lock_handler(protocol);
1155         if (!IS_ERR(handler))
1156                 handler->dump(skb, cb, r);
1157         else
1158                 err = PTR_ERR(handler);
1159         inet_diag_unlock_handler(handler);
1160
1161         /* The skb is not large enough to fit one sk info and
1162          * inet_sk_diag_fill() has requested for a larger skb.
1163          */
1164         if (!skb->len && cb->min_dump_alloc > prev_min_dump_alloc) {
1165                 err = pskb_expand_head(skb, 0, cb->min_dump_alloc, GFP_KERNEL);
1166                 if (!err)
1167                         goto again;
1168         }
1169
1170         return err ? : skb->len;
1171 }
1172
1173 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
1174 {
1175         return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh));
1176 }
1177
1178 static int __inet_diag_dump_start(struct netlink_callback *cb, int hdrlen)
1179 {
1180         const struct nlmsghdr *nlh = cb->nlh;
1181         struct inet_diag_dump_data *cb_data;
1182         struct sk_buff *skb = cb->skb;
1183         struct nlattr *nla;
1184         int err;
1185
1186         cb_data = kzalloc(sizeof(*cb_data), GFP_KERNEL);
1187         if (!cb_data)
1188                 return -ENOMEM;
1189
1190         err = inet_diag_parse_attrs(nlh, hdrlen, cb_data->req_nlas);
1191         if (err) {
1192                 kfree(cb_data);
1193                 return err;
1194         }
1195         nla = cb_data->inet_diag_nla_bc;
1196         if (nla) {
1197                 err = inet_diag_bc_audit(nla, skb);
1198                 if (err) {
1199                         kfree(cb_data);
1200                         return err;
1201                 }
1202         }
1203
1204         nla = cb_data->inet_diag_nla_bpf_stgs;
1205         if (nla) {
1206                 struct bpf_sk_storage_diag *bpf_stg_diag;
1207
1208                 bpf_stg_diag = bpf_sk_storage_diag_alloc(nla);
1209                 if (IS_ERR(bpf_stg_diag)) {
1210                         kfree(cb_data);
1211                         return PTR_ERR(bpf_stg_diag);
1212                 }
1213                 cb_data->bpf_stg_diag = bpf_stg_diag;
1214         }
1215
1216         cb->data = cb_data;
1217         return 0;
1218 }
1219
1220 static int inet_diag_dump_start(struct netlink_callback *cb)
1221 {
1222         return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req_v2));
1223 }
1224
1225 static int inet_diag_dump_start_compat(struct netlink_callback *cb)
1226 {
1227         return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req));
1228 }
1229
1230 static int inet_diag_dump_done(struct netlink_callback *cb)
1231 {
1232         struct inet_diag_dump_data *cb_data = cb->data;
1233
1234         bpf_sk_storage_diag_free(cb_data->bpf_stg_diag);
1235         kfree(cb->data);
1236
1237         return 0;
1238 }
1239
1240 static int inet_diag_type2proto(int type)
1241 {
1242         switch (type) {
1243         case TCPDIAG_GETSOCK:
1244                 return IPPROTO_TCP;
1245         case DCCPDIAG_GETSOCK:
1246                 return IPPROTO_DCCP;
1247         default:
1248                 return 0;
1249         }
1250 }
1251
1252 static int inet_diag_dump_compat(struct sk_buff *skb,
1253                                  struct netlink_callback *cb)
1254 {
1255         struct inet_diag_req *rc = nlmsg_data(cb->nlh);
1256         struct inet_diag_req_v2 req;
1257
1258         req.sdiag_family = AF_UNSPEC; /* compatibility */
1259         req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1260         req.idiag_ext = rc->idiag_ext;
1261         req.idiag_states = rc->idiag_states;
1262         req.id = rc->id;
1263
1264         return __inet_diag_dump(skb, cb, &req);
1265 }
1266
1267 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1268                                       const struct nlmsghdr *nlh)
1269 {
1270         struct inet_diag_req *rc = nlmsg_data(nlh);
1271         struct inet_diag_req_v2 req;
1272
1273         req.sdiag_family = rc->idiag_family;
1274         req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1275         req.idiag_ext = rc->idiag_ext;
1276         req.idiag_states = rc->idiag_states;
1277         req.id = rc->id;
1278
1279         return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh,
1280                                    sizeof(struct inet_diag_req), &req);
1281 }
1282
1283 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1284 {
1285         int hdrlen = sizeof(struct inet_diag_req);
1286         struct net *net = sock_net(skb->sk);
1287
1288         if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1289             nlmsg_len(nlh) < hdrlen)
1290                 return -EINVAL;
1291
1292         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1293                 struct netlink_dump_control c = {
1294                         .start = inet_diag_dump_start_compat,
1295                         .done = inet_diag_dump_done,
1296                         .dump = inet_diag_dump_compat,
1297                 };
1298                 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1299         }
1300
1301         return inet_diag_get_exact_compat(skb, nlh);
1302 }
1303
1304 static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
1305 {
1306         int hdrlen = sizeof(struct inet_diag_req_v2);
1307         struct net *net = sock_net(skb->sk);
1308
1309         if (nlmsg_len(h) < hdrlen)
1310                 return -EINVAL;
1311
1312         if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1313             h->nlmsg_flags & NLM_F_DUMP) {
1314                 struct netlink_dump_control c = {
1315                         .start = inet_diag_dump_start,
1316                         .done = inet_diag_dump_done,
1317                         .dump = inet_diag_dump,
1318                 };
1319                 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1320         }
1321
1322         return inet_diag_cmd_exact(h->nlmsg_type, skb, h, hdrlen,
1323                                    nlmsg_data(h));
1324 }
1325
1326 static
1327 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1328 {
1329         const struct inet_diag_handler *handler;
1330         struct nlmsghdr *nlh;
1331         struct nlattr *attr;
1332         struct inet_diag_msg *r;
1333         void *info = NULL;
1334         int err = 0;
1335
1336         nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1337         if (!nlh)
1338                 return -ENOMEM;
1339
1340         r = nlmsg_data(nlh);
1341         memset(r, 0, sizeof(*r));
1342         inet_diag_msg_common_fill(r, sk);
1343         if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1344                 r->id.idiag_sport = inet_sk(sk)->inet_sport;
1345         r->idiag_state = sk->sk_state;
1346
1347         if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1348                 nlmsg_cancel(skb, nlh);
1349                 return err;
1350         }
1351
1352         handler = inet_diag_lock_handler(sk->sk_protocol);
1353         if (IS_ERR(handler)) {
1354                 inet_diag_unlock_handler(handler);
1355                 nlmsg_cancel(skb, nlh);
1356                 return PTR_ERR(handler);
1357         }
1358
1359         attr = handler->idiag_info_size
1360                 ? nla_reserve_64bit(skb, INET_DIAG_INFO,
1361                                     handler->idiag_info_size,
1362                                     INET_DIAG_PAD)
1363                 : NULL;
1364         if (attr)
1365                 info = nla_data(attr);
1366
1367         handler->idiag_get_info(sk, r, info);
1368         inet_diag_unlock_handler(handler);
1369
1370         nlmsg_end(skb, nlh);
1371         return 0;
1372 }
1373
1374 static const struct sock_diag_handler inet_diag_handler = {
1375         .family = AF_INET,
1376         .dump = inet_diag_handler_cmd,
1377         .get_info = inet_diag_handler_get_info,
1378         .destroy = inet_diag_handler_cmd,
1379 };
1380
1381 static const struct sock_diag_handler inet6_diag_handler = {
1382         .family = AF_INET6,
1383         .dump = inet_diag_handler_cmd,
1384         .get_info = inet_diag_handler_get_info,
1385         .destroy = inet_diag_handler_cmd,
1386 };
1387
1388 int inet_diag_register(const struct inet_diag_handler *h)
1389 {
1390         const __u16 type = h->idiag_type;
1391         int err = -EINVAL;
1392
1393         if (type >= IPPROTO_MAX)
1394                 goto out;
1395
1396         mutex_lock(&inet_diag_table_mutex);
1397         err = -EEXIST;
1398         if (!inet_diag_table[type]) {
1399                 inet_diag_table[type] = h;
1400                 err = 0;
1401         }
1402         mutex_unlock(&inet_diag_table_mutex);
1403 out:
1404         return err;
1405 }
1406 EXPORT_SYMBOL_GPL(inet_diag_register);
1407
1408 void inet_diag_unregister(const struct inet_diag_handler *h)
1409 {
1410         const __u16 type = h->idiag_type;
1411
1412         if (type >= IPPROTO_MAX)
1413                 return;
1414
1415         mutex_lock(&inet_diag_table_mutex);
1416         inet_diag_table[type] = NULL;
1417         mutex_unlock(&inet_diag_table_mutex);
1418 }
1419 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1420
1421 static int __init inet_diag_init(void)
1422 {
1423         const int inet_diag_table_size = (IPPROTO_MAX *
1424                                           sizeof(struct inet_diag_handler *));
1425         int err = -ENOMEM;
1426
1427         inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1428         if (!inet_diag_table)
1429                 goto out;
1430
1431         err = sock_diag_register(&inet_diag_handler);
1432         if (err)
1433                 goto out_free_nl;
1434
1435         err = sock_diag_register(&inet6_diag_handler);
1436         if (err)
1437                 goto out_free_inet;
1438
1439         sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1440 out:
1441         return err;
1442
1443 out_free_inet:
1444         sock_diag_unregister(&inet_diag_handler);
1445 out_free_nl:
1446         kfree(inet_diag_table);
1447         goto out;
1448 }
1449
1450 static void __exit inet_diag_exit(void)
1451 {
1452         sock_diag_unregister(&inet6_diag_handler);
1453         sock_diag_unregister(&inet_diag_handler);
1454         sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1455         kfree(inet_diag_table);
1456 }
1457
1458 module_init(inet_diag_init);
1459 module_exit(inet_diag_exit);
1460 MODULE_LICENSE("GPL");
1461 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1462 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);