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         struct inet_diag_sockopt inet_sockopt;
 129
 130         if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
 131                 goto errout;
 132
 133         /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
 134          * hence this needs to be included regardless of socket family.
 135          */
 136         if (ext & (1 << (INET_DIAG_TOS - 1)))
 137                 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
 138                         goto errout;
 139
 140 #if IS_ENABLED(CONFIG_IPV6)
 141         if (r->idiag_family == AF_INET6) {
 142                 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
 143                         if (nla_put_u8(skb, INET_DIAG_TCLASS,
 144                                        inet6_sk(sk)->tclass) < 0)
 145                                 goto errout;
 146
 147                 if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
 148                     nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
 149                         goto errout;
 150         }
 151 #endif
 152
 153         if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, sk->sk_mark))
 154                 goto errout;
 155
 156         if (ext & (1 << (INET_DIAG_CLASS_ID - 1)) ||
 157             ext & (1 << (INET_DIAG_TCLASS - 1))) {
 158                 u32 classid = 0;
 159
 160 #ifdef CONFIG_SOCK_CGROUP_DATA
 161                 classid = sock_cgroup_classid(&sk->sk_cgrp_data);
 162 #endif
 163                 /* Fallback to socket priority if class id isn't set.
 164                  * Classful qdiscs use it as direct reference to class.
 165                  * For cgroup2 classid is always zero.
 166                  */
 167                 if (!classid)
 168                         classid = sk->sk_priority;
 169
 170                 if (nla_put_u32(skb, INET_DIAG_CLASS_ID, classid))
 171                         goto errout;
 172         }
 173
 174 #ifdef CONFIG_SOCK_CGROUP_DATA
 175         if (nla_put_u64_64bit(skb, INET_DIAG_CGROUP_ID,
 176                               cgroup_id(sock_cgroup_ptr(&sk->sk_cgrp_data)),
 177                               INET_DIAG_PAD))
 178                 goto errout;
 179 #endif
 180
 181         r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
 182         r->idiag_inode = sock_i_ino(sk);
 183
 184         memset(&inet_sockopt, 0, sizeof(inet_sockopt));
 185         inet_sockopt.recverr    = inet->recverr;
 186         inet_sockopt.is_icsk    = inet->is_icsk;
 187         inet_sockopt.freebind   = inet->freebind;
 188         inet_sockopt.hdrincl    = inet->hdrincl;
 189         inet_sockopt.mc_loop    = inet->mc_loop;
 190         inet_sockopt.transparent = inet->transparent;
 191         inet_sockopt.mc_all     = inet->mc_all;
 192         inet_sockopt.nodefrag   = inet->nodefrag;
 193         inet_sockopt.bind_address_no_port = inet->bind_address_no_port;
 194         inet_sockopt.recverr_rfc4884 = inet->recverr_rfc4884;
 195         inet_sockopt.defer_connect = inet->defer_connect;
 196         if (nla_put(skb, INET_DIAG_SOCKOPT, sizeof(inet_sockopt),
 197                     &inet_sockopt))
 198                 goto errout;
 199
 200         return 0;
 201 errout:
 202         return 1;
 203 }
 204 EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill);
 205
 206 static int inet_diag_parse_attrs(const struct nlmsghdr *nlh, int hdrlen,
 207                                  struct nlattr **req_nlas)
 208 {
 209         struct nlattr *nla;
 210         int remaining;
 211
 212         nlmsg_for_each_attr(nla, nlh, hdrlen, remaining) {
 213                 int type = nla_type(nla);
 214
 215                 if (type == INET_DIAG_REQ_PROTOCOL && nla_len(nla) != sizeof(u32))
 216                         return -EINVAL;
 217
 218                 if (type < __INET_DIAG_REQ_MAX)
 219                         req_nlas[type] = nla;
 220         }
 221         return 0;
 222 }
 223
 224 static int inet_diag_get_protocol(const struct inet_diag_req_v2 *req,
 225                                   const struct inet_diag_dump_data *data)
 226 {
 227         if (data->req_nlas[INET_DIAG_REQ_PROTOCOL])
 228                 return nla_get_u32(data->req_nlas[INET_DIAG_REQ_PROTOCOL]);
 229         return req->sdiag_protocol;
 230 }
 231
 232 #define MAX_DUMP_ALLOC_SIZE (KMALLOC_MAX_SIZE - SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
 233
 234 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
 235                       struct sk_buff *skb, struct netlink_callback *cb,
 236                       const struct inet_diag_req_v2 *req,
 237                       u16 nlmsg_flags, bool net_admin)
 238 {
 239         const struct tcp_congestion_ops *ca_ops;
 240         const struct inet_diag_handler *handler;
 241         struct inet_diag_dump_data *cb_data;
 242         int ext = req->idiag_ext;
 243         struct inet_diag_msg *r;
 244         struct nlmsghdr  *nlh;
 245         struct nlattr *attr;
 246         void *info = NULL;
 247
 248         cb_data = cb->data;
 249         handler = inet_diag_table[inet_diag_get_protocol(req, cb_data)];
 250         BUG_ON(!handler);
 251
 252         nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
 253                         cb->nlh->nlmsg_type, sizeof(*r), nlmsg_flags);
 254         if (!nlh)
 255                 return -EMSGSIZE;
 256
 257         r = nlmsg_data(nlh);
 258         BUG_ON(!sk_fullsock(sk));
 259
 260         inet_diag_msg_common_fill(r, sk);
 261         r->idiag_state = sk->sk_state;
 262         r->idiag_timer = 0;
 263         r->idiag_retrans = 0;
 264         r->idiag_expires = 0;
 265
 266         if (inet_diag_msg_attrs_fill(sk, skb, r, ext,
 267                                      sk_user_ns(NETLINK_CB(cb->skb).sk),
 268                                      net_admin))
 269                 goto errout;
 270
 271         if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
 272                 struct inet_diag_meminfo minfo = {
 273                         .idiag_rmem = sk_rmem_alloc_get(sk),
 274                         .idiag_wmem = READ_ONCE(sk->sk_wmem_queued),
 275                         .idiag_fmem = sk_forward_alloc_get(sk),
 276                         .idiag_tmem = sk_wmem_alloc_get(sk),
 277                 };
 278
 279                 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
 280                         goto errout;
 281         }
 282
 283         if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
 284                 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
 285                         goto errout;
 286
 287         /*
 288          * RAW sockets might have user-defined protocols assigned,
 289          * so report the one supplied on socket creation.
 290          */
 291         if (sk->sk_type == SOCK_RAW) {
 292                 if (nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))
 293                         goto errout;
 294         }
 295
 296         if (!icsk) {
 297                 handler->idiag_get_info(sk, r, NULL);
 298                 goto out;
 299         }
 300
 301         if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
 302             icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT ||
 303             icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
 304                 r->idiag_timer = 1;
 305                 r->idiag_retrans = icsk->icsk_retransmits;
 306                 r->idiag_expires =
 307                         jiffies_delta_to_msecs(icsk->icsk_timeout - jiffies);
 308         } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
 309                 r->idiag_timer = 4;
 310                 r->idiag_retrans = icsk->icsk_probes_out;
 311                 r->idiag_expires =
 312                         jiffies_delta_to_msecs(icsk->icsk_timeout - jiffies);
 313         } else if (timer_pending(&sk->sk_timer)) {
 314                 r->idiag_timer = 2;
 315                 r->idiag_retrans = icsk->icsk_probes_out;
 316                 r->idiag_expires =
 317                         jiffies_delta_to_msecs(sk->sk_timer.expires - jiffies);
 318         }
 319
 320         if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
 321                 attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
 322                                          handler->idiag_info_size,
 323                                          INET_DIAG_PAD);
 324                 if (!attr)
 325                         goto errout;
 326
 327                 info = nla_data(attr);
 328         }
 329
 330         if (ext & (1 << (INET_DIAG_CONG - 1))) {
 331                 int err = 0;
 332
 333                 rcu_read_lock();
 334                 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
 335                 if (ca_ops)
 336                         err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
 337                 rcu_read_unlock();
 338                 if (err < 0)
 339                         goto errout;
 340         }
 341
 342         handler->idiag_get_info(sk, r, info);
 343
 344         if (ext & (1 << (INET_DIAG_INFO - 1)) && handler->idiag_get_aux)
 345                 if (handler->idiag_get_aux(sk, net_admin, skb) < 0)
 346                         goto errout;
 347
 348         if (sk->sk_state < TCP_TIME_WAIT) {
 349                 union tcp_cc_info info;
 350                 size_t sz = 0;
 351                 int attr;
 352
 353                 rcu_read_lock();
 354                 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
 355                 if (ca_ops && ca_ops->get_info)
 356                         sz = ca_ops->get_info(sk, ext, &attr, &info);
 357                 rcu_read_unlock();
 358                 if (sz && nla_put(skb, attr, sz, &info) < 0)
 359                         goto errout;
 360         }
 361
 362         /* Keep it at the end for potential retry with a larger skb,
 363          * or else do best-effort fitting, which is only done for the
 364          * first_nlmsg.
 365          */
 366         if (cb_data->bpf_stg_diag) {
 367                 bool first_nlmsg = ((unsigned char *)nlh == skb->data);
 368                 unsigned int prev_min_dump_alloc;
 369                 unsigned int total_nla_size = 0;
 370                 unsigned int msg_len;
 371                 int err;
 372
 373                 msg_len = skb_tail_pointer(skb) - (unsigned char *)nlh;
 374                 err = bpf_sk_storage_diag_put(cb_data->bpf_stg_diag, sk, skb,
 375                                               INET_DIAG_SK_BPF_STORAGES,
 376                                               &total_nla_size);
 377
 378                 if (!err)
 379                         goto out;
 380
 381                 total_nla_size += msg_len;
 382                 prev_min_dump_alloc = cb->min_dump_alloc;
 383                 if (total_nla_size > prev_min_dump_alloc)
 384                         cb->min_dump_alloc = min_t(u32, total_nla_size,
 385                                                    MAX_DUMP_ALLOC_SIZE);
 386
 387                 if (!first_nlmsg)
 388                         goto errout;
 389
 390                 if (cb->min_dump_alloc > prev_min_dump_alloc)
 391                         /* Retry with pskb_expand_head() with
 392                          * __GFP_DIRECT_RECLAIM
 393                          */
 394                         goto errout;
 395
 396                 WARN_ON_ONCE(total_nla_size <= prev_min_dump_alloc);
 397
 398                 /* Send what we have for this sk
 399                  * and move on to the next sk in the following
 400                  * dump()
 401                  */
 402         }
 403
 404 out:
 405         nlmsg_end(skb, nlh);
 406         return 0;
 407
 408 errout:
 409         nlmsg_cancel(skb, nlh);
 410         return -EMSGSIZE;
 411 }
 412 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
 413
 414 static int inet_twsk_diag_fill(struct sock *sk,
 415                                struct sk_buff *skb,
 416                                struct netlink_callback *cb,
 417                                u16 nlmsg_flags, bool net_admin)
 418 {
 419         struct inet_timewait_sock *tw = inet_twsk(sk);
 420         struct inet_diag_msg *r;
 421         struct nlmsghdr *nlh;
 422         long tmo;
 423
 424         nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
 425                         cb->nlh->nlmsg_seq, cb->nlh->nlmsg_type,
 426                         sizeof(*r), nlmsg_flags);
 427         if (!nlh)
 428                 return -EMSGSIZE;
 429
 430         r = nlmsg_data(nlh);
 431         BUG_ON(tw->tw_state != TCP_TIME_WAIT);
 432
 433         inet_diag_msg_common_fill(r, sk);
 434         r->idiag_retrans      = 0;
 435
 436         r->idiag_state        = tw->tw_substate;
 437         r->idiag_timer        = 3;
 438         tmo = tw->tw_timer.expires - jiffies;
 439         r->idiag_expires      = jiffies_delta_to_msecs(tmo);
 440         r->idiag_rqueue       = 0;
 441         r->idiag_wqueue       = 0;
 442         r->idiag_uid          = 0;
 443         r->idiag_inode        = 0;
 444
 445         if (net_admin && nla_put_u32(skb, INET_DIAG_MARK,
 446                                      tw->tw_mark)) {
 447                 nlmsg_cancel(skb, nlh);
 448                 return -EMSGSIZE;
 449         }
 450
 451         nlmsg_end(skb, nlh);
 452         return 0;
 453 }
 454
 455 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
 456                               struct netlink_callback *cb,
 457                               u16 nlmsg_flags, bool net_admin)
 458 {
 459         struct request_sock *reqsk = inet_reqsk(sk);
 460         struct inet_diag_msg *r;
 461         struct nlmsghdr *nlh;
 462         long tmo;
 463
 464         nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
 465                         cb->nlh->nlmsg_type, sizeof(*r), nlmsg_flags);
 466         if (!nlh)
 467                 return -EMSGSIZE;
 468
 469         r = nlmsg_data(nlh);
 470         inet_diag_msg_common_fill(r, sk);
 471         r->idiag_state = TCP_SYN_RECV;
 472         r->idiag_timer = 1;
 473         r->idiag_retrans = reqsk->num_retrans;
 474
 475         BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
 476                      offsetof(struct sock, sk_cookie));
 477
 478         tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
 479         r->idiag_expires = jiffies_delta_to_msecs(tmo);
 480         r->idiag_rqueue = 0;
 481         r->idiag_wqueue = 0;
 482         r->idiag_uid    = 0;
 483         r->idiag_inode  = 0;
 484
 485         if (net_admin && nla_put_u32(skb, INET_DIAG_MARK,
 486                                      inet_rsk(reqsk)->ir_mark)) {
 487                 nlmsg_cancel(skb, nlh);
 488                 return -EMSGSIZE;
 489         }
 490
 491         nlmsg_end(skb, nlh);
 492         return 0;
 493 }
 494
 495 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
 496                         struct netlink_callback *cb,
 497                         const struct inet_diag_req_v2 *r,
 498                         u16 nlmsg_flags, bool net_admin)
 499 {
 500         if (sk->sk_state == TCP_TIME_WAIT)
 501                 return inet_twsk_diag_fill(sk, skb, cb, nlmsg_flags, net_admin);
 502
 503         if (sk->sk_state == TCP_NEW_SYN_RECV)
 504                 return inet_req_diag_fill(sk, skb, cb, nlmsg_flags, net_admin);
 505
 506         return inet_sk_diag_fill(sk, inet_csk(sk), skb, cb, r, nlmsg_flags,
 507                                  net_admin);
 508 }
 509
 510 struct sock *inet_diag_find_one_icsk(struct net *net,
 511                                      struct inet_hashinfo *hashinfo,
 512                                      const struct inet_diag_req_v2 *req)
 513 {
 514         struct sock *sk;
 515
 516         rcu_read_lock();
 517         if (req->sdiag_family == AF_INET)
 518                 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
 519                                  req->id.idiag_dport, req->id.idiag_src[0],
 520                                  req->id.idiag_sport, req->id.idiag_if);
 521 #if IS_ENABLED(CONFIG_IPV6)
 522         else if (req->sdiag_family == AF_INET6) {
 523                 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
 524                     ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
 525                         sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
 526                                          req->id.idiag_dport, req->id.idiag_src[3],
 527                                          req->id.idiag_sport, req->id.idiag_if);
 528                 else
 529                         sk = inet6_lookup(net, hashinfo, NULL, 0,
 530                                           (struct in6_addr *)req->id.idiag_dst,
 531                                           req->id.idiag_dport,
 532                                           (struct in6_addr *)req->id.idiag_src,
 533                                           req->id.idiag_sport,
 534                                           req->id.idiag_if);
 535         }
 536 #endif
 537         else {
 538                 rcu_read_unlock();
 539                 return ERR_PTR(-EINVAL);
 540         }
 541         rcu_read_unlock();
 542         if (!sk)
 543                 return ERR_PTR(-ENOENT);
 544
 545         if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
 546                 sock_gen_put(sk);
 547                 return ERR_PTR(-ENOENT);
 548         }
 549
 550         return sk;
 551 }
 552 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
 553
 554 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
 555                             struct netlink_callback *cb,
 556                             const struct inet_diag_req_v2 *req)
 557 {
 558         struct sk_buff *in_skb = cb->skb;
 559         bool net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN);
 560         struct net *net = sock_net(in_skb->sk);
 561         struct sk_buff *rep;
 562         struct sock *sk;
 563         int err;
 564
 565         sk = inet_diag_find_one_icsk(net, hashinfo, req);
 566         if (IS_ERR(sk))
 567                 return PTR_ERR(sk);
 568
 569         rep = nlmsg_new(inet_sk_attr_size(sk, req, net_admin), GFP_KERNEL);
 570         if (!rep) {
 571                 err = -ENOMEM;
 572                 goto out;
 573         }
 574
 575         err = sk_diag_fill(sk, rep, cb, req, 0, net_admin);
 576         if (err < 0) {
 577                 WARN_ON(err == -EMSGSIZE);
 578                 nlmsg_free(rep);
 579                 goto out;
 580         }
 581         err = nlmsg_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid);
 582
 583 out:
 584         if (sk)
 585                 sock_gen_put(sk);
 586
 587         return err;
 588 }
 589 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
 590
 591 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
 592                                const struct nlmsghdr *nlh,
 593                                int hdrlen,
 594                                const struct inet_diag_req_v2 *req)
 595 {
 596         const struct inet_diag_handler *handler;
 597         struct inet_diag_dump_data dump_data;
 598         int err, protocol;
 599
 600         memset(&dump_data, 0, sizeof(dump_data));
 601         err = inet_diag_parse_attrs(nlh, hdrlen, dump_data.req_nlas);
 602         if (err)
 603                 return err;
 604
 605         protocol = inet_diag_get_protocol(req, &dump_data);
 606
 607         handler = inet_diag_lock_handler(protocol);
 608         if (IS_ERR(handler)) {
 609                 err = PTR_ERR(handler);
 610         } else if (cmd == SOCK_DIAG_BY_FAMILY) {
 611                 struct netlink_callback cb = {
 612                         .nlh = nlh,
 613                         .skb = in_skb,
 614                         .data = &dump_data,
 615                 };
 616                 err = handler->dump_one(&cb, req);
 617         } else if (cmd == SOCK_DESTROY && handler->destroy) {
 618                 err = handler->destroy(in_skb, req);
 619         } else {
 620                 err = -EOPNOTSUPP;
 621         }
 622         inet_diag_unlock_handler(handler);
 623
 624         return err;
 625 }
 626
 627 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
 628 {
 629         int words = bits >> 5;
 630
 631         bits &= 0x1f;
 632
 633         if (words) {
 634                 if (memcmp(a1, a2, words << 2))
 635                         return 0;
 636         }
 637         if (bits) {
 638                 __be32 w1, w2;
 639                 __be32 mask;
 640
 641                 w1 = a1[words];
 642                 w2 = a2[words];
 643
 644                 mask = htonl((0xffffffff) << (32 - bits));
 645
 646                 if ((w1 ^ w2) & mask)
 647                         return 0;
 648         }
 649
 650         return 1;
 651 }
 652
 653 static int inet_diag_bc_run(const struct nlattr *_bc,
 654                             const struct inet_diag_entry *entry)
 655 {
 656         const void *bc = nla_data(_bc);
 657         int len = nla_len(_bc);
 658
 659         while (len > 0) {
 660                 int yes = 1;
 661                 const struct inet_diag_bc_op *op = bc;
 662
 663                 switch (op->code) {
 664                 case INET_DIAG_BC_NOP:
 665                         break;
 666                 case INET_DIAG_BC_JMP:
 667                         yes = 0;
 668                         break;
 669                 case INET_DIAG_BC_S_EQ:
 670                         yes = entry->sport == op[1].no;
 671                         break;
 672                 case INET_DIAG_BC_S_GE:
 673                         yes = entry->sport >= op[1].no;
 674                         break;
 675                 case INET_DIAG_BC_S_LE:
 676                         yes = entry->sport <= op[1].no;
 677                         break;
 678                 case INET_DIAG_BC_D_EQ:
 679                         yes = entry->dport == op[1].no;
 680                         break;
 681                 case INET_DIAG_BC_D_GE:
 682                         yes = entry->dport >= op[1].no;
 683                         break;
 684                 case INET_DIAG_BC_D_LE:
 685                         yes = entry->dport <= op[1].no;
 686                         break;
 687                 case INET_DIAG_BC_AUTO:
 688                         yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
 689                         break;
 690                 case INET_DIAG_BC_S_COND:
 691                 case INET_DIAG_BC_D_COND: {
 692                         const struct inet_diag_hostcond *cond;
 693                         const __be32 *addr;
 694
 695                         cond = (const struct inet_diag_hostcond *)(op + 1);
 696                         if (cond->port != -1 &&
 697                             cond->port != (op->code == INET_DIAG_BC_S_COND ?
 698                                              entry->sport : entry->dport)) {
 699                                 yes = 0;
 700                                 break;
 701                         }
 702
 703                         if (op->code == INET_DIAG_BC_S_COND)
 704                                 addr = entry->saddr;
 705                         else
 706                                 addr = entry->daddr;
 707
 708                         if (cond->family != AF_UNSPEC &&
 709                             cond->family != entry->family) {
 710                                 if (entry->family == AF_INET6 &&
 711                                     cond->family == AF_INET) {
 712                                         if (addr[0] == 0 && addr[1] == 0 &&
 713                                             addr[2] == htonl(0xffff) &&
 714                                             bitstring_match(addr + 3,
 715                                                             cond->addr,
 716                                                             cond->prefix_len))
 717                                                 break;
 718                                 }
 719                                 yes = 0;
 720                                 break;
 721                         }
 722
 723                         if (cond->prefix_len == 0)
 724                                 break;
 725                         if (bitstring_match(addr, cond->addr,
 726                                             cond->prefix_len))
 727                                 break;
 728                         yes = 0;
 729                         break;
 730                 }
 731                 case INET_DIAG_BC_DEV_COND: {
 732                         u32 ifindex;
 733
 734                         ifindex = *((const u32 *)(op + 1));
 735                         if (ifindex != entry->ifindex)
 736                                 yes = 0;
 737                         break;
 738                 }
 739                 case INET_DIAG_BC_MARK_COND: {
 740                         struct inet_diag_markcond *cond;
 741
 742                         cond = (struct inet_diag_markcond *)(op + 1);
 743                         if ((entry->mark & cond->mask) != cond->mark)
 744                                 yes = 0;
 745                         break;
 746                 }
 747 #ifdef CONFIG_SOCK_CGROUP_DATA
 748                 case INET_DIAG_BC_CGROUP_COND: {
 749                         u64 cgroup_id;
 750
 751                         cgroup_id = get_unaligned((const u64 *)(op + 1));
 752                         if (cgroup_id != entry->cgroup_id)
 753                                 yes = 0;
 754                         break;
 755                 }
 756 #endif
 757                 }
 758
 759                 if (yes) {
 760                         len -= op->yes;
 761                         bc += op->yes;
 762                 } else {
 763                         len -= op->no;
 764                         bc += op->no;
 765                 }
 766         }
 767         return len == 0;
 768 }
 769
 770 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
 771  */
 772 static void entry_fill_addrs(struct inet_diag_entry *entry,
 773                              const struct sock *sk)
 774 {
 775 #if IS_ENABLED(CONFIG_IPV6)
 776         if (sk->sk_family == AF_INET6) {
 777                 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
 778                 entry->daddr = sk->sk_v6_daddr.s6_addr32;
 779         } else
 780 #endif
 781         {
 782                 entry->saddr = &sk->sk_rcv_saddr;
 783                 entry->daddr = &sk->sk_daddr;
 784         }
 785 }
 786
 787 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
 788 {
 789         struct inet_sock *inet = inet_sk(sk);
 790         struct inet_diag_entry entry;
 791
 792         if (!bc)
 793                 return 1;
 794
 795         entry.family = sk->sk_family;
 796         entry_fill_addrs(&entry, sk);
 797         entry.sport = inet->inet_num;
 798         entry.dport = ntohs(inet->inet_dport);
 799         entry.ifindex = sk->sk_bound_dev_if;
 800         entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
 801         if (sk_fullsock(sk))
 802                 entry.mark = sk->sk_mark;
 803         else if (sk->sk_state == TCP_NEW_SYN_RECV)
 804                 entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark;
 805         else if (sk->sk_state == TCP_TIME_WAIT)
 806                 entry.mark = inet_twsk(sk)->tw_mark;
 807         else
 808                 entry.mark = 0;
 809 #ifdef CONFIG_SOCK_CGROUP_DATA
 810         entry.cgroup_id = sk_fullsock(sk) ?
 811                 cgroup_id(sock_cgroup_ptr(&sk->sk_cgrp_data)) : 0;
 812 #endif
 813
 814         return inet_diag_bc_run(bc, &entry);
 815 }
 816 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
 817
 818 static int valid_cc(const void *bc, int len, int cc)
 819 {
 820         while (len >= 0) {
 821                 const struct inet_diag_bc_op *op = bc;
 822
 823                 if (cc > len)
 824                         return 0;
 825                 if (cc == len)
 826                         return 1;
 827                 if (op->yes < 4 || op->yes & 3)
 828                         return 0;
 829                 len -= op->yes;
 830                 bc  += op->yes;
 831         }
 832         return 0;
 833 }
 834
 835 /* data is u32 ifindex */
 836 static bool valid_devcond(const struct inet_diag_bc_op *op, int len,
 837                           int *min_len)
 838 {
 839         /* Check ifindex space. */
 840         *min_len += sizeof(u32);
 841         if (len < *min_len)
 842                 return false;
 843
 844         return true;
 845 }
 846 /* Validate an inet_diag_hostcond. */
 847 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
 848                            int *min_len)
 849 {
 850         struct inet_diag_hostcond *cond;
 851         int addr_len;
 852
 853         /* Check hostcond space. */
 854         *min_len += sizeof(struct inet_diag_hostcond);
 855         if (len < *min_len)
 856                 return false;
 857         cond = (struct inet_diag_hostcond *)(op + 1);
 858
 859         /* Check address family and address length. */
 860         switch (cond->family) {
 861         case AF_UNSPEC:
 862                 addr_len = 0;
 863                 break;
 864         case AF_INET:
 865                 addr_len = sizeof(struct in_addr);
 866                 break;
 867         case AF_INET6:
 868                 addr_len = sizeof(struct in6_addr);
 869                 break;
 870         default:
 871                 return false;
 872         }
 873         *min_len += addr_len;
 874         if (len < *min_len)
 875                 return false;
 876
 877         /* Check prefix length (in bits) vs address length (in bytes). */
 878         if (cond->prefix_len > 8 * addr_len)
 879                 return false;
 880
 881         return true;
 882 }
 883
 884 /* Validate a port comparison operator. */
 885 static bool valid_port_comparison(const struct inet_diag_bc_op *op,
 886                                   int len, int *min_len)
 887 {
 888         /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
 889         *min_len += sizeof(struct inet_diag_bc_op);
 890         if (len < *min_len)
 891                 return false;
 892         return true;
 893 }
 894
 895 static bool valid_markcond(const struct inet_diag_bc_op *op, int len,
 896                            int *min_len)
 897 {
 898         *min_len += sizeof(struct inet_diag_markcond);
 899         return len >= *min_len;
 900 }
 901
 902 #ifdef CONFIG_SOCK_CGROUP_DATA
 903 static bool valid_cgroupcond(const struct inet_diag_bc_op *op, int len,
 904                              int *min_len)
 905 {
 906         *min_len += sizeof(u64);
 907         return len >= *min_len;
 908 }
 909 #endif
 910
 911 static int inet_diag_bc_audit(const struct nlattr *attr,
 912                               const struct sk_buff *skb)
 913 {
 914         bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN);
 915         const void *bytecode, *bc;
 916         int bytecode_len, len;
 917
 918         if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op))
 919                 return -EINVAL;
 920
 921         bytecode = bc = nla_data(attr);
 922         len = bytecode_len = nla_len(attr);
 923
 924         while (len > 0) {
 925                 int min_len = sizeof(struct inet_diag_bc_op);
 926                 const struct inet_diag_bc_op *op = bc;
 927
 928                 switch (op->code) {
 929                 case INET_DIAG_BC_S_COND:
 930                 case INET_DIAG_BC_D_COND:
 931                         if (!valid_hostcond(bc, len, &min_len))
 932                                 return -EINVAL;
 933                         break;
 934                 case INET_DIAG_BC_DEV_COND:
 935                         if (!valid_devcond(bc, len, &min_len))
 936                                 return -EINVAL;
 937                         break;
 938                 case INET_DIAG_BC_S_EQ:
 939                 case INET_DIAG_BC_S_GE:
 940                 case INET_DIAG_BC_S_LE:
 941                 case INET_DIAG_BC_D_EQ:
 942                 case INET_DIAG_BC_D_GE:
 943                 case INET_DIAG_BC_D_LE:
 944                         if (!valid_port_comparison(bc, len, &min_len))
 945                                 return -EINVAL;
 946                         break;
 947                 case INET_DIAG_BC_MARK_COND:
 948                         if (!net_admin)
 949                                 return -EPERM;
 950                         if (!valid_markcond(bc, len, &min_len))
 951                                 return -EINVAL;
 952                         break;
 953 #ifdef CONFIG_SOCK_CGROUP_DATA
 954                 case INET_DIAG_BC_CGROUP_COND:
 955                         if (!valid_cgroupcond(bc, len, &min_len))
 956                                 return -EINVAL;
 957                         break;
 958 #endif
 959                 case INET_DIAG_BC_AUTO:
 960                 case INET_DIAG_BC_JMP:
 961                 case INET_DIAG_BC_NOP:
 962                         break;
 963                 default:
 964                         return -EINVAL;
 965                 }
 966
 967                 if (op->code != INET_DIAG_BC_NOP) {
 968                         if (op->no < min_len || op->no > len + 4 || op->no & 3)
 969                                 return -EINVAL;
 970                         if (op->no < len &&
 971                             !valid_cc(bytecode, bytecode_len, len - op->no))
 972                                 return -EINVAL;
 973                 }
 974
 975                 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
 976                         return -EINVAL;
 977                 bc  += op->yes;
 978                 len -= op->yes;
 979         }
 980         return len == 0 ? 0 : -EINVAL;
 981 }
 982
 983 static void twsk_build_assert(void)
 984 {
 985         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
 986                      offsetof(struct sock, sk_family));
 987
 988         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
 989                      offsetof(struct inet_sock, inet_num));
 990
 991         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
 992                      offsetof(struct inet_sock, inet_dport));
 993
 994         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
 995                      offsetof(struct inet_sock, inet_rcv_saddr));
 996
 997         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
 998                      offsetof(struct inet_sock, inet_daddr));
 999
1000 #if IS_ENABLED(CONFIG_IPV6)
1001         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
1002                      offsetof(struct sock, sk_v6_rcv_saddr));
1003
1004         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
1005                      offsetof(struct sock, sk_v6_daddr));
1006 #endif
1007 }
1008
1009 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
1010                          struct netlink_callback *cb,
1011                          const struct inet_diag_req_v2 *r)
1012 {
1013         bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
1014         struct inet_diag_dump_data *cb_data = cb->data;
1015         struct net *net = sock_net(skb->sk);
1016         u32 idiag_states = r->idiag_states;
1017         int i, num, s_i, s_num;
1018         struct nlattr *bc;
1019         struct sock *sk;
1020
1021         bc = cb_data->inet_diag_nla_bc;
1022         if (idiag_states & TCPF_SYN_RECV)
1023                 idiag_states |= TCPF_NEW_SYN_RECV;
1024         s_i = cb->args[1];
1025         s_num = num = cb->args[2];
1026
1027         if (cb->args[0] == 0) {
1028                 if (!(idiag_states & TCPF_LISTEN) || r->id.idiag_dport)
1029                         goto skip_listen_ht;
1030
1031                 for (i = s_i; i <= hashinfo->lhash2_mask; i++) {
1032                         struct inet_listen_hashbucket *ilb;
1033                         struct hlist_nulls_node *node;
1034
1035                         num = 0;
1036                         ilb = &hashinfo->lhash2[i];
1037
1038                         spin_lock(&ilb->lock);
1039                         sk_nulls_for_each(sk, node, &ilb->nulls_head) {
1040                                 struct inet_sock *inet = inet_sk(sk);
1041
1042                                 if (!net_eq(sock_net(sk), net))
1043                                         continue;
1044
1045                                 if (num < s_num) {
1046                                         num++;
1047                                         continue;
1048                                 }
1049
1050                                 if (r->sdiag_family != AF_UNSPEC &&
1051                                     sk->sk_family != r->sdiag_family)
1052                                         goto next_listen;
1053
1054                                 if (r->id.idiag_sport != inet->inet_sport &&
1055                                     r->id.idiag_sport)
1056                                         goto next_listen;
1057
1058                                 if (!inet_diag_bc_sk(bc, sk))
1059                                         goto next_listen;
1060
1061                                 if (inet_sk_diag_fill(sk, inet_csk(sk), skb,
1062                                                       cb, r, NLM_F_MULTI,
1063                                                       net_admin) < 0) {
1064                                         spin_unlock(&ilb->lock);
1065                                         goto done;
1066                                 }
1067
1068 next_listen:
1069                                 ++num;
1070                         }
1071                         spin_unlock(&ilb->lock);
1072
1073                         s_num = 0;
1074                 }
1075 skip_listen_ht:
1076                 cb->args[0] = 1;
1077                 s_i = num = s_num = 0;
1078         }
1079
1080         if (!(idiag_states & ~TCPF_LISTEN))
1081                 goto out;
1082
1083 #define SKARR_SZ 16
1084         for (i = s_i; i <= hashinfo->ehash_mask; i++) {
1085                 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
1086                 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
1087                 struct hlist_nulls_node *node;
1088                 struct sock *sk_arr[SKARR_SZ];
1089                 int num_arr[SKARR_SZ];
1090                 int idx, accum, res;
1091
1092                 if (hlist_nulls_empty(&head->chain))
1093                         continue;
1094
1095                 if (i > s_i)
1096                         s_num = 0;
1097
1098 next_chunk:
1099                 num = 0;
1100                 accum = 0;
1101                 spin_lock_bh(lock);
1102                 sk_nulls_for_each(sk, node, &head->chain) {
1103                         int state;
1104
1105                         if (!net_eq(sock_net(sk), net))
1106                                 continue;
1107                         if (num < s_num)
1108                                 goto next_normal;
1109                         state = (sk->sk_state == TCP_TIME_WAIT) ?
1110                                 inet_twsk(sk)->tw_substate : sk->sk_state;
1111                         if (!(idiag_states & (1 << state)))
1112                                 goto next_normal;
1113                         if (r->sdiag_family != AF_UNSPEC &&
1114                             sk->sk_family != r->sdiag_family)
1115                                 goto next_normal;
1116                         if (r->id.idiag_sport != htons(sk->sk_num) &&
1117                             r->id.idiag_sport)
1118                                 goto next_normal;
1119                         if (r->id.idiag_dport != sk->sk_dport &&
1120                             r->id.idiag_dport)
1121                                 goto next_normal;
1122                         twsk_build_assert();
1123
1124                         if (!inet_diag_bc_sk(bc, sk))
1125                                 goto next_normal;
1126
1127                         if (!refcount_inc_not_zero(&sk->sk_refcnt))
1128                                 goto next_normal;
1129
1130                         num_arr[accum] = num;
1131                         sk_arr[accum] = sk;
1132                         if (++accum == SKARR_SZ)
1133                                 break;
1134 next_normal:
1135                         ++num;
1136                 }
1137                 spin_unlock_bh(lock);
1138                 res = 0;
1139                 for (idx = 0; idx < accum; idx++) {
1140                         if (res >= 0) {
1141                                 res = sk_diag_fill(sk_arr[idx], skb, cb, r,
1142                                                    NLM_F_MULTI, net_admin);
1143                                 if (res < 0)
1144                                         num = num_arr[idx];
1145                         }
1146                         sock_gen_put(sk_arr[idx]);
1147                 }
1148                 if (res < 0)
1149                         break;
1150                 cond_resched();
1151                 if (accum == SKARR_SZ) {
1152                         s_num = num + 1;
1153                         goto next_chunk;
1154                 }
1155         }
1156
1157 done:
1158         cb->args[1] = i;
1159         cb->args[2] = num;
1160 out:
1161         ;
1162 }
1163 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
1164
1165 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
1166                             const struct inet_diag_req_v2 *r)
1167 {
1168         struct inet_diag_dump_data *cb_data = cb->data;
1169         const struct inet_diag_handler *handler;
1170         u32 prev_min_dump_alloc;
1171         int protocol, err = 0;
1172
1173         protocol = inet_diag_get_protocol(r, cb_data);
1174
1175 again:
1176         prev_min_dump_alloc = cb->min_dump_alloc;
1177         handler = inet_diag_lock_handler(protocol);
1178         if (!IS_ERR(handler))
1179                 handler->dump(skb, cb, r);
1180         else
1181                 err = PTR_ERR(handler);
1182         inet_diag_unlock_handler(handler);
1183
1184         /* The skb is not large enough to fit one sk info and
1185          * inet_sk_diag_fill() has requested for a larger skb.
1186          */
1187         if (!skb->len && cb->min_dump_alloc > prev_min_dump_alloc) {
1188                 err = pskb_expand_head(skb, 0, cb->min_dump_alloc, GFP_KERNEL);
1189                 if (!err)
1190                         goto again;
1191         }
1192
1193         return err ? : skb->len;
1194 }
1195
1196 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
1197 {
1198         return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh));
1199 }
1200
1201 static int __inet_diag_dump_start(struct netlink_callback *cb, int hdrlen)
1202 {
1203         const struct nlmsghdr *nlh = cb->nlh;
1204         struct inet_diag_dump_data *cb_data;
1205         struct sk_buff *skb = cb->skb;
1206         struct nlattr *nla;
1207         int err;
1208
1209         cb_data = kzalloc(sizeof(*cb_data), GFP_KERNEL);
1210         if (!cb_data)
1211                 return -ENOMEM;
1212
1213         err = inet_diag_parse_attrs(nlh, hdrlen, cb_data->req_nlas);
1214         if (err) {
1215                 kfree(cb_data);
1216                 return err;
1217         }
1218         nla = cb_data->inet_diag_nla_bc;
1219         if (nla) {
1220                 err = inet_diag_bc_audit(nla, skb);
1221                 if (err) {
1222                         kfree(cb_data);
1223                         return err;
1224                 }
1225         }
1226
1227         nla = cb_data->inet_diag_nla_bpf_stgs;
1228         if (nla) {
1229                 struct bpf_sk_storage_diag *bpf_stg_diag;
1230
1231                 bpf_stg_diag = bpf_sk_storage_diag_alloc(nla);
1232                 if (IS_ERR(bpf_stg_diag)) {
1233                         kfree(cb_data);
1234                         return PTR_ERR(bpf_stg_diag);
1235                 }
1236                 cb_data->bpf_stg_diag = bpf_stg_diag;
1237         }
1238
1239         cb->data = cb_data;
1240         return 0;
1241 }
1242
1243 static int inet_diag_dump_start(struct netlink_callback *cb)
1244 {
1245         return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req_v2));
1246 }
1247
1248 static int inet_diag_dump_start_compat(struct netlink_callback *cb)
1249 {
1250         return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req));
1251 }
1252
1253 static int inet_diag_dump_done(struct netlink_callback *cb)
1254 {
1255         struct inet_diag_dump_data *cb_data = cb->data;
1256
1257         bpf_sk_storage_diag_free(cb_data->bpf_stg_diag);
1258         kfree(cb->data);
1259
1260         return 0;
1261 }
1262
1263 static int inet_diag_type2proto(int type)
1264 {
1265         switch (type) {
1266         case TCPDIAG_GETSOCK:
1267                 return IPPROTO_TCP;
1268         case DCCPDIAG_GETSOCK:
1269                 return IPPROTO_DCCP;
1270         default:
1271                 return 0;
1272         }
1273 }
1274
1275 static int inet_diag_dump_compat(struct sk_buff *skb,
1276                                  struct netlink_callback *cb)
1277 {
1278         struct inet_diag_req *rc = nlmsg_data(cb->nlh);
1279         struct inet_diag_req_v2 req;
1280
1281         req.sdiag_family = AF_UNSPEC; /* compatibility */
1282         req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1283         req.idiag_ext = rc->idiag_ext;
1284         req.idiag_states = rc->idiag_states;
1285         req.id = rc->id;
1286
1287         return __inet_diag_dump(skb, cb, &req);
1288 }
1289
1290 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1291                                       const struct nlmsghdr *nlh)
1292 {
1293         struct inet_diag_req *rc = nlmsg_data(nlh);
1294         struct inet_diag_req_v2 req;
1295
1296         req.sdiag_family = rc->idiag_family;
1297         req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1298         req.idiag_ext = rc->idiag_ext;
1299         req.idiag_states = rc->idiag_states;
1300         req.id = rc->id;
1301
1302         return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh,
1303                                    sizeof(struct inet_diag_req), &req);
1304 }
1305
1306 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1307 {
1308         int hdrlen = sizeof(struct inet_diag_req);
1309         struct net *net = sock_net(skb->sk);
1310
1311         if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1312             nlmsg_len(nlh) < hdrlen)
1313                 return -EINVAL;
1314
1315         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1316                 struct netlink_dump_control c = {
1317                         .start = inet_diag_dump_start_compat,
1318                         .done = inet_diag_dump_done,
1319                         .dump = inet_diag_dump_compat,
1320                 };
1321                 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1322         }
1323
1324         return inet_diag_get_exact_compat(skb, nlh);
1325 }
1326
1327 static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
1328 {
1329         int hdrlen = sizeof(struct inet_diag_req_v2);
1330         struct net *net = sock_net(skb->sk);
1331
1332         if (nlmsg_len(h) < hdrlen)
1333                 return -EINVAL;
1334
1335         if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1336             h->nlmsg_flags & NLM_F_DUMP) {
1337                 struct netlink_dump_control c = {
1338                         .start = inet_diag_dump_start,
1339                         .done = inet_diag_dump_done,
1340                         .dump = inet_diag_dump,
1341                 };
1342                 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1343         }
1344
1345         return inet_diag_cmd_exact(h->nlmsg_type, skb, h, hdrlen,
1346                                    nlmsg_data(h));
1347 }
1348
1349 static
1350 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1351 {
1352         const struct inet_diag_handler *handler;
1353         struct nlmsghdr *nlh;
1354         struct nlattr *attr;
1355         struct inet_diag_msg *r;
1356         void *info = NULL;
1357         int err = 0;
1358
1359         nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1360         if (!nlh)
1361                 return -ENOMEM;
1362
1363         r = nlmsg_data(nlh);
1364         memset(r, 0, sizeof(*r));
1365         inet_diag_msg_common_fill(r, sk);
1366         if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1367                 r->id.idiag_sport = inet_sk(sk)->inet_sport;
1368         r->idiag_state = sk->sk_state;
1369
1370         if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1371                 nlmsg_cancel(skb, nlh);
1372                 return err;
1373         }
1374
1375         handler = inet_diag_lock_handler(sk->sk_protocol);
1376         if (IS_ERR(handler)) {
1377                 inet_diag_unlock_handler(handler);
1378                 nlmsg_cancel(skb, nlh);
1379                 return PTR_ERR(handler);
1380         }
1381
1382         attr = handler->idiag_info_size
1383                 ? nla_reserve_64bit(skb, INET_DIAG_INFO,
1384                                     handler->idiag_info_size,
1385                                     INET_DIAG_PAD)
1386                 : NULL;
1387         if (attr)
1388                 info = nla_data(attr);
1389
1390         handler->idiag_get_info(sk, r, info);
1391         inet_diag_unlock_handler(handler);
1392
1393         nlmsg_end(skb, nlh);
1394         return 0;
1395 }
1396
1397 static const struct sock_diag_handler inet_diag_handler = {
1398         .family = AF_INET,
1399         .dump = inet_diag_handler_cmd,
1400         .get_info = inet_diag_handler_get_info,
1401         .destroy = inet_diag_handler_cmd,
1402 };
1403
1404 static const struct sock_diag_handler inet6_diag_handler = {
1405         .family = AF_INET6,
1406         .dump = inet_diag_handler_cmd,
1407         .get_info = inet_diag_handler_get_info,
1408         .destroy = inet_diag_handler_cmd,
1409 };
1410
1411 int inet_diag_register(const struct inet_diag_handler *h)
1412 {
1413         const __u16 type = h->idiag_type;
1414         int err = -EINVAL;
1415
1416         if (type >= IPPROTO_MAX)
1417                 goto out;
1418
1419         mutex_lock(&inet_diag_table_mutex);
1420         err = -EEXIST;
1421         if (!inet_diag_table[type]) {
1422                 inet_diag_table[type] = h;
1423                 err = 0;
1424         }
1425         mutex_unlock(&inet_diag_table_mutex);
1426 out:
1427         return err;
1428 }
1429 EXPORT_SYMBOL_GPL(inet_diag_register);
1430
1431 void inet_diag_unregister(const struct inet_diag_handler *h)
1432 {
1433         const __u16 type = h->idiag_type;
1434
1435         if (type >= IPPROTO_MAX)
1436                 return;
1437
1438         mutex_lock(&inet_diag_table_mutex);
1439         inet_diag_table[type] = NULL;
1440         mutex_unlock(&inet_diag_table_mutex);
1441 }
1442 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1443
1444 static int __init inet_diag_init(void)
1445 {
1446         const int inet_diag_table_size = (IPPROTO_MAX *
1447                                           sizeof(struct inet_diag_handler *));
1448         int err = -ENOMEM;
1449
1450         inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1451         if (!inet_diag_table)
1452                 goto out;
1453
1454         err = sock_diag_register(&inet_diag_handler);
1455         if (err)
1456                 goto out_free_nl;
1457
1458         err = sock_diag_register(&inet6_diag_handler);
1459         if (err)
1460                 goto out_free_inet;
1461
1462         sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1463 out:
1464         return err;
1465
1466 out_free_inet:
1467         sock_diag_unregister(&inet_diag_handler);
1468 out_free_nl:
1469         kfree(inet_diag_table);
1470         goto out;
1471 }
1472
1473 static void __exit inet_diag_exit(void)
1474 {
1475         sock_diag_unregister(&inet6_diag_handler);
1476         sock_diag_unregister(&inet_diag_handler);
1477         sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1478         kfree(inet_diag_table);
1479 }
1480
1481 module_init(inet_diag_init);
1482 module_exit(inet_diag_exit);
1483 MODULE_LICENSE("GPL");
1484 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1485 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);