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