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 __rcu **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 const struct inet_diag_handler *inet_diag_lock_handler(int proto)
  52 {
  53         const struct inet_diag_handler *handler;
  54
  55         if (proto < 0 || proto >= IPPROTO_MAX)
  56                 return NULL;
  57
  58         if (!READ_ONCE(inet_diag_table[proto]))
  59                 sock_load_diag_module(AF_INET, proto);
  60
  61         rcu_read_lock();
  62         handler = rcu_dereference(inet_diag_table[proto]);
  63         if (handler && !try_module_get(handler->owner))
  64                 handler = NULL;
  65         rcu_read_unlock();
  66
  67         return handler;
  68 }
  69
  70 static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
  71 {
  72         module_put(handler->owner);
  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         rcu_read_lock();
 108         handler = rcu_dereference(inet_diag_table[req->sdiag_protocol]);
 109         DEBUG_NET_WARN_ON_ONCE(!handler);
 110         if (handler && handler->idiag_get_aux_size)
 111                 aux = handler->idiag_get_aux_size(sk, net_admin);
 112         rcu_read_unlock();
 113
 114         return    nla_total_size(sizeof(struct tcp_info))
 115                 + nla_total_size(sizeof(struct inet_diag_msg))
 116                 + inet_diag_msg_attrs_size()
 117                 + nla_total_size(sizeof(struct inet_diag_meminfo))
 118                 + nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
 119                 + nla_total_size(TCP_CA_NAME_MAX)
 120                 + nla_total_size(sizeof(struct tcpvegas_info))
 121                 + aux
 122                 + 64;
 123 }
 124
 125 int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
 126                              struct inet_diag_msg *r, int ext,
 127                              struct user_namespace *user_ns,
 128                              bool net_admin)
 129 {
 130         const struct inet_sock *inet = inet_sk(sk);
 131         struct inet_diag_sockopt inet_sockopt;
 132
 133         if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
 134                 goto errout;
 135
 136         /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
 137          * hence this needs to be included regardless of socket family.
 138          */
 139         if (ext & (1 << (INET_DIAG_TOS - 1)))
 140                 if (nla_put_u8(skb, INET_DIAG_TOS, READ_ONCE(inet->tos)) < 0)
 141                         goto errout;
 142
 143 #if IS_ENABLED(CONFIG_IPV6)
 144         if (r->idiag_family == AF_INET6) {
 145                 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
 146                         if (nla_put_u8(skb, INET_DIAG_TCLASS,
 147                                        inet6_sk(sk)->tclass) < 0)
 148                                 goto errout;
 149
 150                 if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
 151                     nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
 152                         goto errout;
 153         }
 154 #endif
 155
 156         if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, READ_ONCE(sk->sk_mark)))
 157                 goto errout;
 158
 159         if (ext & (1 << (INET_DIAG_CLASS_ID - 1)) ||
 160             ext & (1 << (INET_DIAG_TCLASS - 1))) {
 161                 u32 classid = 0;
 162
 163 #ifdef CONFIG_SOCK_CGROUP_DATA
 164                 classid = sock_cgroup_classid(&sk->sk_cgrp_data);
 165 #endif
 166                 /* Fallback to socket priority if class id isn't set.
 167                  * Classful qdiscs use it as direct reference to class.
 168                  * For cgroup2 classid is always zero.
 169                  */
 170                 if (!classid)
 171                         classid = READ_ONCE(sk->sk_priority);
 172
 173                 if (nla_put_u32(skb, INET_DIAG_CLASS_ID, classid))
 174                         goto errout;
 175         }
 176
 177 #ifdef CONFIG_SOCK_CGROUP_DATA
 178         if (nla_put_u64_64bit(skb, INET_DIAG_CGROUP_ID,
 179                               cgroup_id(sock_cgroup_ptr(&sk->sk_cgrp_data)),
 180                               INET_DIAG_PAD))
 181                 goto errout;
 182 #endif
 183
 184         r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
 185         r->idiag_inode = sock_i_ino(sk);
 186
 187         memset(&inet_sockopt, 0, sizeof(inet_sockopt));
 188         inet_sockopt.recverr    = inet_test_bit(RECVERR, sk);
 189         inet_sockopt.is_icsk    = inet_test_bit(IS_ICSK, sk);
 190         inet_sockopt.freebind   = inet_test_bit(FREEBIND, sk);
 191         inet_sockopt.hdrincl    = inet_test_bit(HDRINCL, sk);
 192         inet_sockopt.mc_loop    = inet_test_bit(MC_LOOP, sk);
 193         inet_sockopt.transparent = inet_test_bit(TRANSPARENT, sk);
 194         inet_sockopt.mc_all     = inet_test_bit(MC_ALL, sk);
 195         inet_sockopt.nodefrag   = inet_test_bit(NODEFRAG, sk);
 196         inet_sockopt.bind_address_no_port = inet_test_bit(BIND_ADDRESS_NO_PORT, sk);
 197         inet_sockopt.recverr_rfc4884 = inet_test_bit(RECVERR_RFC4884, sk);
 198         inet_sockopt.defer_connect = inet_test_bit(DEFER_CONNECT, sk);
 199         if (nla_put(skb, INET_DIAG_SOCKOPT, sizeof(inet_sockopt),
 200                     &inet_sockopt))
 201                 goto errout;
 202
 203         return 0;
 204 errout:
 205         return 1;
 206 }
 207 EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill);
 208
 209 static int inet_diag_parse_attrs(const struct nlmsghdr *nlh, int hdrlen,
 210                                  struct nlattr **req_nlas)
 211 {
 212         struct nlattr *nla;
 213         int remaining;
 214
 215         nlmsg_for_each_attr(nla, nlh, hdrlen, remaining) {
 216                 int type = nla_type(nla);
 217
 218                 if (type == INET_DIAG_REQ_PROTOCOL && nla_len(nla) != sizeof(u32))
 219                         return -EINVAL;
 220
 221                 if (type < __INET_DIAG_REQ_MAX)
 222                         req_nlas[type] = nla;
 223         }
 224         return 0;
 225 }
 226
 227 static int inet_diag_get_protocol(const struct inet_diag_req_v2 *req,
 228                                   const struct inet_diag_dump_data *data)
 229 {
 230         if (data->req_nlas[INET_DIAG_REQ_PROTOCOL])
 231                 return nla_get_u32(data->req_nlas[INET_DIAG_REQ_PROTOCOL]);
 232         return req->sdiag_protocol;
 233 }
 234
 235 #define MAX_DUMP_ALLOC_SIZE (KMALLOC_MAX_SIZE - SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
 236
 237 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
 238                       struct sk_buff *skb, struct netlink_callback *cb,
 239                       const struct inet_diag_req_v2 *req,
 240                       u16 nlmsg_flags, bool net_admin)
 241 {
 242         const struct tcp_congestion_ops *ca_ops;
 243         const struct inet_diag_handler *handler;
 244         struct inet_diag_dump_data *cb_data;
 245         int ext = req->idiag_ext;
 246         struct inet_diag_msg *r;
 247         struct nlmsghdr  *nlh;
 248         struct nlattr *attr;
 249         void *info = NULL;
 250         int protocol;
 251
 252         cb_data = cb->data;
 253         protocol = inet_diag_get_protocol(req, cb_data);
 254
 255         /* inet_diag_lock_handler() made sure inet_diag_table[] is stable. */
 256         handler = rcu_dereference_protected(inet_diag_table[protocol], 1);
 257         DEBUG_NET_WARN_ON_ONCE(!handler);
 258         if (!handler)
 259                 return -ENXIO;
 260
 261         nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
 262                         cb->nlh->nlmsg_type, sizeof(*r), nlmsg_flags);
 263         if (!nlh)
 264                 return -EMSGSIZE;
 265
 266         r = nlmsg_data(nlh);
 267         BUG_ON(!sk_fullsock(sk));
 268
 269         inet_diag_msg_common_fill(r, sk);
 270         r->idiag_state = sk->sk_state;
 271         r->idiag_timer = 0;
 272         r->idiag_retrans = 0;
 273         r->idiag_expires = 0;
 274
 275         if (inet_diag_msg_attrs_fill(sk, skb, r, ext,
 276                                      sk_user_ns(NETLINK_CB(cb->skb).sk),
 277                                      net_admin))
 278                 goto errout;
 279
 280         if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
 281                 struct inet_diag_meminfo minfo = {
 282                         .idiag_rmem = sk_rmem_alloc_get(sk),
 283                         .idiag_wmem = READ_ONCE(sk->sk_wmem_queued),
 284                         .idiag_fmem = sk_forward_alloc_get(sk),
 285                         .idiag_tmem = sk_wmem_alloc_get(sk),
 286                 };
 287
 288                 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
 289                         goto errout;
 290         }
 291
 292         if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
 293                 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
 294                         goto errout;
 295
 296         /*
 297          * RAW sockets might have user-defined protocols assigned,
 298          * so report the one supplied on socket creation.
 299          */
 300         if (sk->sk_type == SOCK_RAW) {
 301                 if (nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))
 302                         goto errout;
 303         }
 304
 305         if (!icsk) {
 306                 handler->idiag_get_info(sk, r, NULL);
 307                 goto out;
 308         }
 309
 310         if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
 311             icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT ||
 312             icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
 313                 r->idiag_timer = 1;
 314                 r->idiag_retrans = icsk->icsk_retransmits;
 315                 r->idiag_expires =
 316                         jiffies_delta_to_msecs(icsk->icsk_timeout - jiffies);
 317         } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
 318                 r->idiag_timer = 4;
 319                 r->idiag_retrans = icsk->icsk_probes_out;
 320                 r->idiag_expires =
 321                         jiffies_delta_to_msecs(icsk->icsk_timeout - jiffies);
 322         } else if (timer_pending(&sk->sk_timer)) {
 323                 r->idiag_timer = 2;
 324                 r->idiag_retrans = icsk->icsk_probes_out;
 325                 r->idiag_expires =
 326                         jiffies_delta_to_msecs(sk->sk_timer.expires - jiffies);
 327         }
 328
 329         if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
 330                 attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
 331                                          handler->idiag_info_size,
 332                                          INET_DIAG_PAD);
 333                 if (!attr)
 334                         goto errout;
 335
 336                 info = nla_data(attr);
 337         }
 338
 339         if (ext & (1 << (INET_DIAG_CONG - 1))) {
 340                 int err = 0;
 341
 342                 rcu_read_lock();
 343                 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
 344                 if (ca_ops)
 345                         err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
 346                 rcu_read_unlock();
 347                 if (err < 0)
 348                         goto errout;
 349         }
 350
 351         handler->idiag_get_info(sk, r, info);
 352
 353         if (ext & (1 << (INET_DIAG_INFO - 1)) && handler->idiag_get_aux)
 354                 if (handler->idiag_get_aux(sk, net_admin, skb) < 0)
 355                         goto errout;
 356
 357         if (sk->sk_state < TCP_TIME_WAIT) {
 358                 union tcp_cc_info info;
 359                 size_t sz = 0;
 360                 int attr;
 361
 362                 rcu_read_lock();
 363                 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
 364                 if (ca_ops && ca_ops->get_info)
 365                         sz = ca_ops->get_info(sk, ext, &attr, &info);
 366                 rcu_read_unlock();
 367                 if (sz && nla_put(skb, attr, sz, &info) < 0)
 368                         goto errout;
 369         }
 370
 371         /* Keep it at the end for potential retry with a larger skb,
 372          * or else do best-effort fitting, which is only done for the
 373          * first_nlmsg.
 374          */
 375         if (cb_data->bpf_stg_diag) {
 376                 bool first_nlmsg = ((unsigned char *)nlh == skb->data);
 377                 unsigned int prev_min_dump_alloc;
 378                 unsigned int total_nla_size = 0;
 379                 unsigned int msg_len;
 380                 int err;
 381
 382                 msg_len = skb_tail_pointer(skb) - (unsigned char *)nlh;
 383                 err = bpf_sk_storage_diag_put(cb_data->bpf_stg_diag, sk, skb,
 384                                               INET_DIAG_SK_BPF_STORAGES,
 385                                               &total_nla_size);
 386
 387                 if (!err)
 388                         goto out;
 389
 390                 total_nla_size += msg_len;
 391                 prev_min_dump_alloc = cb->min_dump_alloc;
 392                 if (total_nla_size > prev_min_dump_alloc)
 393                         cb->min_dump_alloc = min_t(u32, total_nla_size,
 394                                                    MAX_DUMP_ALLOC_SIZE);
 395
 396                 if (!first_nlmsg)
 397                         goto errout;
 398
 399                 if (cb->min_dump_alloc > prev_min_dump_alloc)
 400                         /* Retry with pskb_expand_head() with
 401                          * __GFP_DIRECT_RECLAIM
 402                          */
 403                         goto errout;
 404
 405                 WARN_ON_ONCE(total_nla_size <= prev_min_dump_alloc);
 406
 407                 /* Send what we have for this sk
 408                  * and move on to the next sk in the following
 409                  * dump()
 410                  */
 411         }
 412
 413 out:
 414         nlmsg_end(skb, nlh);
 415         return 0;
 416
 417 errout:
 418         nlmsg_cancel(skb, nlh);
 419         return -EMSGSIZE;
 420 }
 421 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
 422
 423 static int inet_twsk_diag_fill(struct sock *sk,
 424                                struct sk_buff *skb,
 425                                struct netlink_callback *cb,
 426                                u16 nlmsg_flags, bool net_admin)
 427 {
 428         struct inet_timewait_sock *tw = inet_twsk(sk);
 429         struct inet_diag_msg *r;
 430         struct nlmsghdr *nlh;
 431         long tmo;
 432
 433         nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
 434                         cb->nlh->nlmsg_seq, cb->nlh->nlmsg_type,
 435                         sizeof(*r), nlmsg_flags);
 436         if (!nlh)
 437                 return -EMSGSIZE;
 438
 439         r = nlmsg_data(nlh);
 440         BUG_ON(tw->tw_state != TCP_TIME_WAIT);
 441
 442         inet_diag_msg_common_fill(r, sk);
 443         r->idiag_retrans      = 0;
 444
 445         r->idiag_state        = tw->tw_substate;
 446         r->idiag_timer        = 3;
 447         tmo = tw->tw_timer.expires - jiffies;
 448         r->idiag_expires      = jiffies_delta_to_msecs(tmo);
 449         r->idiag_rqueue       = 0;
 450         r->idiag_wqueue       = 0;
 451         r->idiag_uid          = 0;
 452         r->idiag_inode        = 0;
 453
 454         if (net_admin && nla_put_u32(skb, INET_DIAG_MARK,
 455                                      tw->tw_mark)) {
 456                 nlmsg_cancel(skb, nlh);
 457                 return -EMSGSIZE;
 458         }
 459
 460         nlmsg_end(skb, nlh);
 461         return 0;
 462 }
 463
 464 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
 465                               struct netlink_callback *cb,
 466                               u16 nlmsg_flags, bool net_admin)
 467 {
 468         struct request_sock *reqsk = inet_reqsk(sk);
 469         struct inet_diag_msg *r;
 470         struct nlmsghdr *nlh;
 471         long tmo;
 472
 473         nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
 474                         cb->nlh->nlmsg_type, sizeof(*r), nlmsg_flags);
 475         if (!nlh)
 476                 return -EMSGSIZE;
 477
 478         r = nlmsg_data(nlh);
 479         inet_diag_msg_common_fill(r, sk);
 480         r->idiag_state = TCP_SYN_RECV;
 481         r->idiag_timer = 1;
 482         r->idiag_retrans = reqsk->num_retrans;
 483
 484         BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
 485                      offsetof(struct sock, sk_cookie));
 486
 487         tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
 488         r->idiag_expires = jiffies_delta_to_msecs(tmo);
 489         r->idiag_rqueue = 0;
 490         r->idiag_wqueue = 0;
 491         r->idiag_uid    = 0;
 492         r->idiag_inode  = 0;
 493
 494         if (net_admin && nla_put_u32(skb, INET_DIAG_MARK,
 495                                      inet_rsk(reqsk)->ir_mark)) {
 496                 nlmsg_cancel(skb, nlh);
 497                 return -EMSGSIZE;
 498         }
 499
 500         nlmsg_end(skb, nlh);
 501         return 0;
 502 }
 503
 504 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
 505                         struct netlink_callback *cb,
 506                         const struct inet_diag_req_v2 *r,
 507                         u16 nlmsg_flags, bool net_admin)
 508 {
 509         if (sk->sk_state == TCP_TIME_WAIT)
 510                 return inet_twsk_diag_fill(sk, skb, cb, nlmsg_flags, net_admin);
 511
 512         if (sk->sk_state == TCP_NEW_SYN_RECV)
 513                 return inet_req_diag_fill(sk, skb, cb, nlmsg_flags, net_admin);
 514
 515         return inet_sk_diag_fill(sk, inet_csk(sk), skb, cb, r, nlmsg_flags,
 516                                  net_admin);
 517 }
 518
 519 struct sock *inet_diag_find_one_icsk(struct net *net,
 520                                      struct inet_hashinfo *hashinfo,
 521                                      const struct inet_diag_req_v2 *req)
 522 {
 523         struct sock *sk;
 524
 525         rcu_read_lock();
 526         if (req->sdiag_family == AF_INET)
 527                 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
 528                                  req->id.idiag_dport, req->id.idiag_src[0],
 529                                  req->id.idiag_sport, req->id.idiag_if);
 530 #if IS_ENABLED(CONFIG_IPV6)
 531         else if (req->sdiag_family == AF_INET6) {
 532                 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
 533                     ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
 534                         sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
 535                                          req->id.idiag_dport, req->id.idiag_src[3],
 536                                          req->id.idiag_sport, req->id.idiag_if);
 537                 else
 538                         sk = inet6_lookup(net, hashinfo, NULL, 0,
 539                                           (struct in6_addr *)req->id.idiag_dst,
 540                                           req->id.idiag_dport,
 541                                           (struct in6_addr *)req->id.idiag_src,
 542                                           req->id.idiag_sport,
 543                                           req->id.idiag_if);
 544         }
 545 #endif
 546         else {
 547                 rcu_read_unlock();
 548                 return ERR_PTR(-EINVAL);
 549         }
 550         rcu_read_unlock();
 551         if (!sk)
 552                 return ERR_PTR(-ENOENT);
 553
 554         if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
 555                 sock_gen_put(sk);
 556                 return ERR_PTR(-ENOENT);
 557         }
 558
 559         return sk;
 560 }
 561 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
 562
 563 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
 564                             struct netlink_callback *cb,
 565                             const struct inet_diag_req_v2 *req)
 566 {
 567         struct sk_buff *in_skb = cb->skb;
 568         bool net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN);
 569         struct net *net = sock_net(in_skb->sk);
 570         struct sk_buff *rep;
 571         struct sock *sk;
 572         int err;
 573
 574         sk = inet_diag_find_one_icsk(net, hashinfo, req);
 575         if (IS_ERR(sk))
 576                 return PTR_ERR(sk);
 577
 578         rep = nlmsg_new(inet_sk_attr_size(sk, req, net_admin), GFP_KERNEL);
 579         if (!rep) {
 580                 err = -ENOMEM;
 581                 goto out;
 582         }
 583
 584         err = sk_diag_fill(sk, rep, cb, req, 0, net_admin);
 585         if (err < 0) {
 586                 WARN_ON(err == -EMSGSIZE);
 587                 nlmsg_free(rep);
 588                 goto out;
 589         }
 590         err = nlmsg_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid);
 591
 592 out:
 593         if (sk)
 594                 sock_gen_put(sk);
 595
 596         return err;
 597 }
 598 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
 599
 600 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
 601                                const struct nlmsghdr *nlh,
 602                                int hdrlen,
 603                                const struct inet_diag_req_v2 *req)
 604 {
 605         const struct inet_diag_handler *handler;
 606         struct inet_diag_dump_data dump_data;
 607         int err, protocol;
 608
 609         memset(&dump_data, 0, sizeof(dump_data));
 610         err = inet_diag_parse_attrs(nlh, hdrlen, dump_data.req_nlas);
 611         if (err)
 612                 return err;
 613
 614         protocol = inet_diag_get_protocol(req, &dump_data);
 615
 616         handler = inet_diag_lock_handler(protocol);
 617         if (!handler)
 618                 return -ENOENT;
 619
 620         if (cmd == SOCK_DIAG_BY_FAMILY) {
 621                 struct netlink_callback cb = {
 622                         .nlh = nlh,
 623                         .skb = in_skb,
 624                         .data = &dump_data,
 625                 };
 626                 err = handler->dump_one(&cb, req);
 627         } else if (cmd == SOCK_DESTROY && handler->destroy) {
 628                 err = handler->destroy(in_skb, req);
 629         } else {
 630                 err = -EOPNOTSUPP;
 631         }
 632         inet_diag_unlock_handler(handler);
 633
 634         return err;
 635 }
 636
 637 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
 638 {
 639         int words = bits >> 5;
 640
 641         bits &= 0x1f;
 642
 643         if (words) {
 644                 if (memcmp(a1, a2, words << 2))
 645                         return 0;
 646         }
 647         if (bits) {
 648                 __be32 w1, w2;
 649                 __be32 mask;
 650
 651                 w1 = a1[words];
 652                 w2 = a2[words];
 653
 654                 mask = htonl((0xffffffff) << (32 - bits));
 655
 656                 if ((w1 ^ w2) & mask)
 657                         return 0;
 658         }
 659
 660         return 1;
 661 }
 662
 663 static int inet_diag_bc_run(const struct nlattr *_bc,
 664                             const struct inet_diag_entry *entry)
 665 {
 666         const void *bc = nla_data(_bc);
 667         int len = nla_len(_bc);
 668
 669         while (len > 0) {
 670                 int yes = 1;
 671                 const struct inet_diag_bc_op *op = bc;
 672
 673                 switch (op->code) {
 674                 case INET_DIAG_BC_NOP:
 675                         break;
 676                 case INET_DIAG_BC_JMP:
 677                         yes = 0;
 678                         break;
 679                 case INET_DIAG_BC_S_EQ:
 680                         yes = entry->sport == op[1].no;
 681                         break;
 682                 case INET_DIAG_BC_S_GE:
 683                         yes = entry->sport >= op[1].no;
 684                         break;
 685                 case INET_DIAG_BC_S_LE:
 686                         yes = entry->sport <= op[1].no;
 687                         break;
 688                 case INET_DIAG_BC_D_EQ:
 689                         yes = entry->dport == op[1].no;
 690                         break;
 691                 case INET_DIAG_BC_D_GE:
 692                         yes = entry->dport >= op[1].no;
 693                         break;
 694                 case INET_DIAG_BC_D_LE:
 695                         yes = entry->dport <= op[1].no;
 696                         break;
 697                 case INET_DIAG_BC_AUTO:
 698                         yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
 699                         break;
 700                 case INET_DIAG_BC_S_COND:
 701                 case INET_DIAG_BC_D_COND: {
 702                         const struct inet_diag_hostcond *cond;
 703                         const __be32 *addr;
 704
 705                         cond = (const struct inet_diag_hostcond *)(op + 1);
 706                         if (cond->port != -1 &&
 707                             cond->port != (op->code == INET_DIAG_BC_S_COND ?
 708                                              entry->sport : entry->dport)) {
 709                                 yes = 0;
 710                                 break;
 711                         }
 712
 713                         if (op->code == INET_DIAG_BC_S_COND)
 714                                 addr = entry->saddr;
 715                         else
 716                                 addr = entry->daddr;
 717
 718                         if (cond->family != AF_UNSPEC &&
 719                             cond->family != entry->family) {
 720                                 if (entry->family == AF_INET6 &&
 721                                     cond->family == AF_INET) {
 722                                         if (addr[0] == 0 && addr[1] == 0 &&
 723                                             addr[2] == htonl(0xffff) &&
 724                                             bitstring_match(addr + 3,
 725                                                             cond->addr,
 726                                                             cond->prefix_len))
 727                                                 break;
 728                                 }
 729                                 yes = 0;
 730                                 break;
 731                         }
 732
 733                         if (cond->prefix_len == 0)
 734                                 break;
 735                         if (bitstring_match(addr, cond->addr,
 736                                             cond->prefix_len))
 737                                 break;
 738                         yes = 0;
 739                         break;
 740                 }
 741                 case INET_DIAG_BC_DEV_COND: {
 742                         u32 ifindex;
 743
 744                         ifindex = *((const u32 *)(op + 1));
 745                         if (ifindex != entry->ifindex)
 746                                 yes = 0;
 747                         break;
 748                 }
 749                 case INET_DIAG_BC_MARK_COND: {
 750                         struct inet_diag_markcond *cond;
 751
 752                         cond = (struct inet_diag_markcond *)(op + 1);
 753                         if ((entry->mark & cond->mask) != cond->mark)
 754                                 yes = 0;
 755                         break;
 756                 }
 757 #ifdef CONFIG_SOCK_CGROUP_DATA
 758                 case INET_DIAG_BC_CGROUP_COND: {
 759                         u64 cgroup_id;
 760
 761                         cgroup_id = get_unaligned((const u64 *)(op + 1));
 762                         if (cgroup_id != entry->cgroup_id)
 763                                 yes = 0;
 764                         break;
 765                 }
 766 #endif
 767                 }
 768
 769                 if (yes) {
 770                         len -= op->yes;
 771                         bc += op->yes;
 772                 } else {
 773                         len -= op->no;
 774                         bc += op->no;
 775                 }
 776         }
 777         return len == 0;
 778 }
 779
 780 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
 781  */
 782 static void entry_fill_addrs(struct inet_diag_entry *entry,
 783                              const struct sock *sk)
 784 {
 785 #if IS_ENABLED(CONFIG_IPV6)
 786         if (sk->sk_family == AF_INET6) {
 787                 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
 788                 entry->daddr = sk->sk_v6_daddr.s6_addr32;
 789         } else
 790 #endif
 791         {
 792                 entry->saddr = &sk->sk_rcv_saddr;
 793                 entry->daddr = &sk->sk_daddr;
 794         }
 795 }
 796
 797 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
 798 {
 799         struct inet_sock *inet = inet_sk(sk);
 800         struct inet_diag_entry entry;
 801
 802         if (!bc)
 803                 return 1;
 804
 805         entry.family = sk->sk_family;
 806         entry_fill_addrs(&entry, sk);
 807         entry.sport = inet->inet_num;
 808         entry.dport = ntohs(inet->inet_dport);
 809         entry.ifindex = sk->sk_bound_dev_if;
 810         entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
 811         if (sk_fullsock(sk))
 812                 entry.mark = READ_ONCE(sk->sk_mark);
 813         else if (sk->sk_state == TCP_NEW_SYN_RECV)
 814                 entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark;
 815         else if (sk->sk_state == TCP_TIME_WAIT)
 816                 entry.mark = inet_twsk(sk)->tw_mark;
 817         else
 818                 entry.mark = 0;
 819 #ifdef CONFIG_SOCK_CGROUP_DATA
 820         entry.cgroup_id = sk_fullsock(sk) ?
 821                 cgroup_id(sock_cgroup_ptr(&sk->sk_cgrp_data)) : 0;
 822 #endif
 823
 824         return inet_diag_bc_run(bc, &entry);
 825 }
 826 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
 827
 828 static int valid_cc(const void *bc, int len, int cc)
 829 {
 830         while (len >= 0) {
 831                 const struct inet_diag_bc_op *op = bc;
 832
 833                 if (cc > len)
 834                         return 0;
 835                 if (cc == len)
 836                         return 1;
 837                 if (op->yes < 4 || op->yes & 3)
 838                         return 0;
 839                 len -= op->yes;
 840                 bc  += op->yes;
 841         }
 842         return 0;
 843 }
 844
 845 /* data is u32 ifindex */
 846 static bool valid_devcond(const struct inet_diag_bc_op *op, int len,
 847                           int *min_len)
 848 {
 849         /* Check ifindex space. */
 850         *min_len += sizeof(u32);
 851         if (len < *min_len)
 852                 return false;
 853
 854         return true;
 855 }
 856 /* Validate an inet_diag_hostcond. */
 857 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
 858                            int *min_len)
 859 {
 860         struct inet_diag_hostcond *cond;
 861         int addr_len;
 862
 863         /* Check hostcond space. */
 864         *min_len += sizeof(struct inet_diag_hostcond);
 865         if (len < *min_len)
 866                 return false;
 867         cond = (struct inet_diag_hostcond *)(op + 1);
 868
 869         /* Check address family and address length. */
 870         switch (cond->family) {
 871         case AF_UNSPEC:
 872                 addr_len = 0;
 873                 break;
 874         case AF_INET:
 875                 addr_len = sizeof(struct in_addr);
 876                 break;
 877         case AF_INET6:
 878                 addr_len = sizeof(struct in6_addr);
 879                 break;
 880         default:
 881                 return false;
 882         }
 883         *min_len += addr_len;
 884         if (len < *min_len)
 885                 return false;
 886
 887         /* Check prefix length (in bits) vs address length (in bytes). */
 888         if (cond->prefix_len > 8 * addr_len)
 889                 return false;
 890
 891         return true;
 892 }
 893
 894 /* Validate a port comparison operator. */
 895 static bool valid_port_comparison(const struct inet_diag_bc_op *op,
 896                                   int len, int *min_len)
 897 {
 898         /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
 899         *min_len += sizeof(struct inet_diag_bc_op);
 900         if (len < *min_len)
 901                 return false;
 902         return true;
 903 }
 904
 905 static bool valid_markcond(const struct inet_diag_bc_op *op, int len,
 906                            int *min_len)
 907 {
 908         *min_len += sizeof(struct inet_diag_markcond);
 909         return len >= *min_len;
 910 }
 911
 912 #ifdef CONFIG_SOCK_CGROUP_DATA
 913 static bool valid_cgroupcond(const struct inet_diag_bc_op *op, int len,
 914                              int *min_len)
 915 {
 916         *min_len += sizeof(u64);
 917         return len >= *min_len;
 918 }
 919 #endif
 920
 921 static int inet_diag_bc_audit(const struct nlattr *attr,
 922                               const struct sk_buff *skb)
 923 {
 924         bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN);
 925         const void *bytecode, *bc;
 926         int bytecode_len, len;
 927
 928         if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op))
 929                 return -EINVAL;
 930
 931         bytecode = bc = nla_data(attr);
 932         len = bytecode_len = nla_len(attr);
 933
 934         while (len > 0) {
 935                 int min_len = sizeof(struct inet_diag_bc_op);
 936                 const struct inet_diag_bc_op *op = bc;
 937
 938                 switch (op->code) {
 939                 case INET_DIAG_BC_S_COND:
 940                 case INET_DIAG_BC_D_COND:
 941                         if (!valid_hostcond(bc, len, &min_len))
 942                                 return -EINVAL;
 943                         break;
 944                 case INET_DIAG_BC_DEV_COND:
 945                         if (!valid_devcond(bc, len, &min_len))
 946                                 return -EINVAL;
 947                         break;
 948                 case INET_DIAG_BC_S_EQ:
 949                 case INET_DIAG_BC_S_GE:
 950                 case INET_DIAG_BC_S_LE:
 951                 case INET_DIAG_BC_D_EQ:
 952                 case INET_DIAG_BC_D_GE:
 953                 case INET_DIAG_BC_D_LE:
 954                         if (!valid_port_comparison(bc, len, &min_len))
 955                                 return -EINVAL;
 956                         break;
 957                 case INET_DIAG_BC_MARK_COND:
 958                         if (!net_admin)
 959                                 return -EPERM;
 960                         if (!valid_markcond(bc, len, &min_len))
 961                                 return -EINVAL;
 962                         break;
 963 #ifdef CONFIG_SOCK_CGROUP_DATA
 964                 case INET_DIAG_BC_CGROUP_COND:
 965                         if (!valid_cgroupcond(bc, len, &min_len))
 966                                 return -EINVAL;
 967                         break;
 968 #endif
 969                 case INET_DIAG_BC_AUTO:
 970                 case INET_DIAG_BC_JMP:
 971                 case INET_DIAG_BC_NOP:
 972                         break;
 973                 default:
 974                         return -EINVAL;
 975                 }
 976
 977                 if (op->code != INET_DIAG_BC_NOP) {
 978                         if (op->no < min_len || op->no > len + 4 || op->no & 3)
 979                                 return -EINVAL;
 980                         if (op->no < len &&
 981                             !valid_cc(bytecode, bytecode_len, len - op->no))
 982                                 return -EINVAL;
 983                 }
 984
 985                 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
 986                         return -EINVAL;
 987                 bc  += op->yes;
 988                 len -= op->yes;
 989         }
 990         return len == 0 ? 0 : -EINVAL;
 991 }
 992
 993 static void twsk_build_assert(void)
 994 {
 995         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
 996                      offsetof(struct sock, sk_family));
 997
 998         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
 999                      offsetof(struct inet_sock, inet_num));
1000
1001         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
1002                      offsetof(struct inet_sock, inet_dport));
1003
1004         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
1005                      offsetof(struct inet_sock, inet_rcv_saddr));
1006
1007         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
1008                      offsetof(struct inet_sock, inet_daddr));
1009
1010 #if IS_ENABLED(CONFIG_IPV6)
1011         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
1012                      offsetof(struct sock, sk_v6_rcv_saddr));
1013
1014         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
1015                      offsetof(struct sock, sk_v6_daddr));
1016 #endif
1017 }
1018
1019 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
1020                          struct netlink_callback *cb,
1021                          const struct inet_diag_req_v2 *r)
1022 {
1023         bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
1024         struct inet_diag_dump_data *cb_data = cb->data;
1025         struct net *net = sock_net(skb->sk);
1026         u32 idiag_states = r->idiag_states;
1027         int i, num, s_i, s_num;
1028         struct nlattr *bc;
1029         struct sock *sk;
1030
1031         bc = cb_data->inet_diag_nla_bc;
1032         if (idiag_states & TCPF_SYN_RECV)
1033                 idiag_states |= TCPF_NEW_SYN_RECV;
1034         s_i = cb->args[1];
1035         s_num = num = cb->args[2];
1036
1037         if (cb->args[0] == 0) {
1038                 if (!(idiag_states & TCPF_LISTEN) || r->id.idiag_dport)
1039                         goto skip_listen_ht;
1040
1041                 for (i = s_i; i <= hashinfo->lhash2_mask; i++) {
1042                         struct inet_listen_hashbucket *ilb;
1043                         struct hlist_nulls_node *node;
1044
1045                         num = 0;
1046                         ilb = &hashinfo->lhash2[i];
1047
1048                         spin_lock(&ilb->lock);
1049                         sk_nulls_for_each(sk, node, &ilb->nulls_head) {
1050                                 struct inet_sock *inet = inet_sk(sk);
1051
1052                                 if (!net_eq(sock_net(sk), net))
1053                                         continue;
1054
1055                                 if (num < s_num) {
1056                                         num++;
1057                                         continue;
1058                                 }
1059
1060                                 if (r->sdiag_family != AF_UNSPEC &&
1061                                     sk->sk_family != r->sdiag_family)
1062                                         goto next_listen;
1063
1064                                 if (r->id.idiag_sport != inet->inet_sport &&
1065                                     r->id.idiag_sport)
1066                                         goto next_listen;
1067
1068                                 if (!inet_diag_bc_sk(bc, sk))
1069                                         goto next_listen;
1070
1071                                 if (inet_sk_diag_fill(sk, inet_csk(sk), skb,
1072                                                       cb, r, NLM_F_MULTI,
1073                                                       net_admin) < 0) {
1074                                         spin_unlock(&ilb->lock);
1075                                         goto done;
1076                                 }
1077
1078 next_listen:
1079                                 ++num;
1080                         }
1081                         spin_unlock(&ilb->lock);
1082
1083                         s_num = 0;
1084                 }
1085 skip_listen_ht:
1086                 cb->args[0] = 1;
1087                 s_i = num = s_num = 0;
1088         }
1089
1090 /* Process a maximum of SKARR_SZ sockets at a time when walking hash buckets
1091  * with bh disabled.
1092  */
1093 #define SKARR_SZ 16
1094
1095         /* Dump bound but inactive (not listening, connecting, etc.) sockets */
1096         if (cb->args[0] == 1) {
1097                 if (!(idiag_states & TCPF_BOUND_INACTIVE))
1098                         goto skip_bind_ht;
1099
1100                 for (i = s_i; i < hashinfo->bhash_size; i++) {
1101                         struct inet_bind_hashbucket *ibb;
1102                         struct inet_bind2_bucket *tb2;
1103                         struct sock *sk_arr[SKARR_SZ];
1104                         int num_arr[SKARR_SZ];
1105                         int idx, accum, res;
1106
1107 resume_bind_walk:
1108                         num = 0;
1109                         accum = 0;
1110                         ibb = &hashinfo->bhash2[i];
1111
1112                         spin_lock_bh(&ibb->lock);
1113                         inet_bind_bucket_for_each(tb2, &ibb->chain) {
1114                                 if (!net_eq(ib2_net(tb2), net))
1115                                         continue;
1116
1117                                 sk_for_each_bound(sk, &tb2->owners) {
1118                                         struct inet_sock *inet = inet_sk(sk);
1119
1120                                         if (num < s_num)
1121                                                 goto next_bind;
1122
1123                                         if (sk->sk_state != TCP_CLOSE ||
1124                                             !inet->inet_num)
1125                                                 goto next_bind;
1126
1127                                         if (r->sdiag_family != AF_UNSPEC &&
1128                                             r->sdiag_family != sk->sk_family)
1129                                                 goto next_bind;
1130
1131                                         if (!inet_diag_bc_sk(bc, sk))
1132                                                 goto next_bind;
1133
1134                                         sock_hold(sk);
1135                                         num_arr[accum] = num;
1136                                         sk_arr[accum] = sk;
1137                                         if (++accum == SKARR_SZ)
1138                                                 goto pause_bind_walk;
1139 next_bind:
1140                                         num++;
1141                                 }
1142                         }
1143 pause_bind_walk:
1144                         spin_unlock_bh(&ibb->lock);
1145
1146                         res = 0;
1147                         for (idx = 0; idx < accum; idx++) {
1148                                 if (res >= 0) {
1149                                         res = inet_sk_diag_fill(sk_arr[idx],
1150                                                                 NULL, skb, cb,
1151                                                                 r, NLM_F_MULTI,
1152                                                                 net_admin);
1153                                         if (res < 0)
1154                                                 num = num_arr[idx];
1155                                 }
1156                                 sock_put(sk_arr[idx]);
1157                         }
1158                         if (res < 0)
1159                                 goto done;
1160
1161                         cond_resched();
1162
1163                         if (accum == SKARR_SZ) {
1164                                 s_num = num + 1;
1165                                 goto resume_bind_walk;
1166                         }
1167
1168                         s_num = 0;
1169                 }
1170 skip_bind_ht:
1171                 cb->args[0] = 2;
1172                 s_i = num = s_num = 0;
1173         }
1174
1175         if (!(idiag_states & ~TCPF_LISTEN))
1176                 goto out;
1177
1178         for (i = s_i; i <= hashinfo->ehash_mask; i++) {
1179                 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
1180                 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
1181                 struct hlist_nulls_node *node;
1182                 struct sock *sk_arr[SKARR_SZ];
1183                 int num_arr[SKARR_SZ];
1184                 int idx, accum, res;
1185
1186                 if (hlist_nulls_empty(&head->chain))
1187                         continue;
1188
1189                 if (i > s_i)
1190                         s_num = 0;
1191
1192 next_chunk:
1193                 num = 0;
1194                 accum = 0;
1195                 spin_lock_bh(lock);
1196                 sk_nulls_for_each(sk, node, &head->chain) {
1197                         int state;
1198
1199                         if (!net_eq(sock_net(sk), net))
1200                                 continue;
1201                         if (num < s_num)
1202                                 goto next_normal;
1203                         state = (sk->sk_state == TCP_TIME_WAIT) ?
1204                                 inet_twsk(sk)->tw_substate : sk->sk_state;
1205                         if (!(idiag_states & (1 << state)))
1206                                 goto next_normal;
1207                         if (r->sdiag_family != AF_UNSPEC &&
1208                             sk->sk_family != r->sdiag_family)
1209                                 goto next_normal;
1210                         if (r->id.idiag_sport != htons(sk->sk_num) &&
1211                             r->id.idiag_sport)
1212                                 goto next_normal;
1213                         if (r->id.idiag_dport != sk->sk_dport &&
1214                             r->id.idiag_dport)
1215                                 goto next_normal;
1216                         twsk_build_assert();
1217
1218                         if (!inet_diag_bc_sk(bc, sk))
1219                                 goto next_normal;
1220
1221                         if (!refcount_inc_not_zero(&sk->sk_refcnt))
1222                                 goto next_normal;
1223
1224                         num_arr[accum] = num;
1225                         sk_arr[accum] = sk;
1226                         if (++accum == SKARR_SZ)
1227                                 break;
1228 next_normal:
1229                         ++num;
1230                 }
1231                 spin_unlock_bh(lock);
1232                 res = 0;
1233                 for (idx = 0; idx < accum; idx++) {
1234                         if (res >= 0) {
1235                                 res = sk_diag_fill(sk_arr[idx], skb, cb, r,
1236                                                    NLM_F_MULTI, net_admin);
1237                                 if (res < 0)
1238                                         num = num_arr[idx];
1239                         }
1240                         sock_gen_put(sk_arr[idx]);
1241                 }
1242                 if (res < 0)
1243                         break;
1244                 cond_resched();
1245                 if (accum == SKARR_SZ) {
1246                         s_num = num + 1;
1247                         goto next_chunk;
1248                 }
1249         }
1250
1251 done:
1252         cb->args[1] = i;
1253         cb->args[2] = num;
1254 out:
1255         ;
1256 }
1257 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
1258
1259 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
1260                             const struct inet_diag_req_v2 *r)
1261 {
1262         struct inet_diag_dump_data *cb_data = cb->data;
1263         const struct inet_diag_handler *handler;
1264         u32 prev_min_dump_alloc;
1265         int protocol, err = 0;
1266
1267         protocol = inet_diag_get_protocol(r, cb_data);
1268
1269 again:
1270         prev_min_dump_alloc = cb->min_dump_alloc;
1271         handler = inet_diag_lock_handler(protocol);
1272         if (handler) {
1273                 handler->dump(skb, cb, r);
1274                 inet_diag_unlock_handler(handler);
1275         } else {
1276                 err = -ENOENT;
1277         }
1278         /* The skb is not large enough to fit one sk info and
1279          * inet_sk_diag_fill() has requested for a larger skb.
1280          */
1281         if (!skb->len && cb->min_dump_alloc > prev_min_dump_alloc) {
1282                 err = pskb_expand_head(skb, 0, cb->min_dump_alloc, GFP_KERNEL);
1283                 if (!err)
1284                         goto again;
1285         }
1286
1287         return err ? : skb->len;
1288 }
1289
1290 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
1291 {
1292         return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh));
1293 }
1294
1295 static int __inet_diag_dump_start(struct netlink_callback *cb, int hdrlen)
1296 {
1297         const struct nlmsghdr *nlh = cb->nlh;
1298         struct inet_diag_dump_data *cb_data;
1299         struct sk_buff *skb = cb->skb;
1300         struct nlattr *nla;
1301         int err;
1302
1303         cb_data = kzalloc(sizeof(*cb_data), GFP_KERNEL);
1304         if (!cb_data)
1305                 return -ENOMEM;
1306
1307         err = inet_diag_parse_attrs(nlh, hdrlen, cb_data->req_nlas);
1308         if (err) {
1309                 kfree(cb_data);
1310                 return err;
1311         }
1312         nla = cb_data->inet_diag_nla_bc;
1313         if (nla) {
1314                 err = inet_diag_bc_audit(nla, skb);
1315                 if (err) {
1316                         kfree(cb_data);
1317                         return err;
1318                 }
1319         }
1320
1321         nla = cb_data->inet_diag_nla_bpf_stgs;
1322         if (nla) {
1323                 struct bpf_sk_storage_diag *bpf_stg_diag;
1324
1325                 bpf_stg_diag = bpf_sk_storage_diag_alloc(nla);
1326                 if (IS_ERR(bpf_stg_diag)) {
1327                         kfree(cb_data);
1328                         return PTR_ERR(bpf_stg_diag);
1329                 }
1330                 cb_data->bpf_stg_diag = bpf_stg_diag;
1331         }
1332
1333         cb->data = cb_data;
1334         return 0;
1335 }
1336
1337 static int inet_diag_dump_start(struct netlink_callback *cb)
1338 {
1339         return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req_v2));
1340 }
1341
1342 static int inet_diag_dump_start_compat(struct netlink_callback *cb)
1343 {
1344         return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req));
1345 }
1346
1347 static int inet_diag_dump_done(struct netlink_callback *cb)
1348 {
1349         struct inet_diag_dump_data *cb_data = cb->data;
1350
1351         bpf_sk_storage_diag_free(cb_data->bpf_stg_diag);
1352         kfree(cb->data);
1353
1354         return 0;
1355 }
1356
1357 static int inet_diag_type2proto(int type)
1358 {
1359         switch (type) {
1360         case TCPDIAG_GETSOCK:
1361                 return IPPROTO_TCP;
1362         case DCCPDIAG_GETSOCK:
1363                 return IPPROTO_DCCP;
1364         default:
1365                 return 0;
1366         }
1367 }
1368
1369 static int inet_diag_dump_compat(struct sk_buff *skb,
1370                                  struct netlink_callback *cb)
1371 {
1372         struct inet_diag_req *rc = nlmsg_data(cb->nlh);
1373         struct inet_diag_req_v2 req;
1374
1375         req.sdiag_family = AF_UNSPEC; /* compatibility */
1376         req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1377         req.idiag_ext = rc->idiag_ext;
1378         req.idiag_states = rc->idiag_states;
1379         req.id = rc->id;
1380
1381         return __inet_diag_dump(skb, cb, &req);
1382 }
1383
1384 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1385                                       const struct nlmsghdr *nlh)
1386 {
1387         struct inet_diag_req *rc = nlmsg_data(nlh);
1388         struct inet_diag_req_v2 req;
1389
1390         req.sdiag_family = rc->idiag_family;
1391         req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1392         req.idiag_ext = rc->idiag_ext;
1393         req.idiag_states = rc->idiag_states;
1394         req.id = rc->id;
1395
1396         return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh,
1397                                    sizeof(struct inet_diag_req), &req);
1398 }
1399
1400 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1401 {
1402         int hdrlen = sizeof(struct inet_diag_req);
1403         struct net *net = sock_net(skb->sk);
1404
1405         if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1406             nlmsg_len(nlh) < hdrlen)
1407                 return -EINVAL;
1408
1409         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1410                 struct netlink_dump_control c = {
1411                         .start = inet_diag_dump_start_compat,
1412                         .done = inet_diag_dump_done,
1413                         .dump = inet_diag_dump_compat,
1414                 };
1415                 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1416         }
1417
1418         return inet_diag_get_exact_compat(skb, nlh);
1419 }
1420
1421 static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
1422 {
1423         int hdrlen = sizeof(struct inet_diag_req_v2);
1424         struct net *net = sock_net(skb->sk);
1425
1426         if (nlmsg_len(h) < hdrlen)
1427                 return -EINVAL;
1428
1429         if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1430             h->nlmsg_flags & NLM_F_DUMP) {
1431                 struct netlink_dump_control c = {
1432                         .start = inet_diag_dump_start,
1433                         .done = inet_diag_dump_done,
1434                         .dump = inet_diag_dump,
1435                 };
1436                 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1437         }
1438
1439         return inet_diag_cmd_exact(h->nlmsg_type, skb, h, hdrlen,
1440                                    nlmsg_data(h));
1441 }
1442
1443 static
1444 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1445 {
1446         const struct inet_diag_handler *handler;
1447         struct nlmsghdr *nlh;
1448         struct nlattr *attr;
1449         struct inet_diag_msg *r;
1450         void *info = NULL;
1451         int err = 0;
1452
1453         nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1454         if (!nlh)
1455                 return -ENOMEM;
1456
1457         r = nlmsg_data(nlh);
1458         memset(r, 0, sizeof(*r));
1459         inet_diag_msg_common_fill(r, sk);
1460         if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1461                 r->id.idiag_sport = inet_sk(sk)->inet_sport;
1462         r->idiag_state = sk->sk_state;
1463
1464         if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1465                 nlmsg_cancel(skb, nlh);
1466                 return err;
1467         }
1468
1469         handler = inet_diag_lock_handler(sk->sk_protocol);
1470         if (!handler) {
1471                 nlmsg_cancel(skb, nlh);
1472                 return -ENOENT;
1473         }
1474
1475         attr = handler->idiag_info_size
1476                 ? nla_reserve_64bit(skb, INET_DIAG_INFO,
1477                                     handler->idiag_info_size,
1478                                     INET_DIAG_PAD)
1479                 : NULL;
1480         if (attr)
1481                 info = nla_data(attr);
1482
1483         handler->idiag_get_info(sk, r, info);
1484         inet_diag_unlock_handler(handler);
1485
1486         nlmsg_end(skb, nlh);
1487         return 0;
1488 }
1489
1490 static const struct sock_diag_handler inet_diag_handler = {
1491         .family = AF_INET,
1492         .dump = inet_diag_handler_cmd,
1493         .get_info = inet_diag_handler_get_info,
1494         .destroy = inet_diag_handler_cmd,
1495 };
1496
1497 static const struct sock_diag_handler inet6_diag_handler = {
1498         .family = AF_INET6,
1499         .dump = inet_diag_handler_cmd,
1500         .get_info = inet_diag_handler_get_info,
1501         .destroy = inet_diag_handler_cmd,
1502 };
1503
1504 int inet_diag_register(const struct inet_diag_handler *h)
1505 {
1506         const __u16 type = h->idiag_type;
1507
1508         if (type >= IPPROTO_MAX)
1509                 return -EINVAL;
1510
1511         return !cmpxchg((const struct inet_diag_handler **)&inet_diag_table[type],
1512                         NULL, h) ? 0 : -EEXIST;
1513 }
1514 EXPORT_SYMBOL_GPL(inet_diag_register);
1515
1516 void inet_diag_unregister(const struct inet_diag_handler *h)
1517 {
1518         const __u16 type = h->idiag_type;
1519
1520         if (type >= IPPROTO_MAX)
1521                 return;
1522
1523         xchg((const struct inet_diag_handler **)&inet_diag_table[type],
1524              NULL);
1525 }
1526 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1527
1528 static int __init inet_diag_init(void)
1529 {
1530         const int inet_diag_table_size = (IPPROTO_MAX *
1531                                           sizeof(struct inet_diag_handler *));
1532         int err = -ENOMEM;
1533
1534         inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1535         if (!inet_diag_table)
1536                 goto out;
1537
1538         err = sock_diag_register(&inet_diag_handler);
1539         if (err)
1540                 goto out_free_nl;
1541
1542         err = sock_diag_register(&inet6_diag_handler);
1543         if (err)
1544                 goto out_free_inet;
1545
1546         sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1547 out:
1548         return err;
1549
1550 out_free_inet:
1551         sock_diag_unregister(&inet_diag_handler);
1552 out_free_nl:
1553         kfree(inet_diag_table);
1554         goto out;
1555 }
1556
1557 static void __exit inet_diag_exit(void)
1558 {
1559         sock_diag_unregister(&inet6_diag_handler);
1560         sock_diag_unregister(&inet_diag_handler);
1561         sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1562         kfree(inet_diag_table);
1563 }
1564
1565 module_init(inet_diag_init);
1566 module_exit(inet_diag_exit);
1567 MODULE_LICENSE("GPL");
1568 MODULE_DESCRIPTION("INET/INET6: socket monitoring via SOCK_DIAG");
1569 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1570 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);