net/ipv4/inet_diag.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * inet_diag.c  Module for monitoring INET transport protocols sockets.
   4  *
   5  * Authors:     Alexey Kuznetsov, <[email protected]>
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/module.h>
  10 #include <linux/types.h>
  11 #include <linux/fcntl.h>
  12 #include <linux/random.h>
  13 #include <linux/slab.h>
  14 #include <linux/cache.h>
  15 #include <linux/init.h>
  16 #include <linux/time.h>
  17
  18 #include <net/icmp.h>
  19 #include <net/tcp.h>
  20 #include <net/ipv6.h>
  21 #include <net/inet_common.h>
  22 #include <net/inet_connection_sock.h>
  23 #include <net/inet_hashtables.h>
  24 #include <net/inet_timewait_sock.h>
  25 #include <net/inet6_hashtables.h>
  26 #include <net/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)
 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         nlmsg_end(skb, nlh);
 448         return 0;
 449 }
 450
 451 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
 452                               struct netlink_callback *cb,
 453                               u16 nlmsg_flags, bool net_admin)
 454 {
 455         struct request_sock *reqsk = inet_reqsk(sk);
 456         struct inet_diag_msg *r;
 457         struct nlmsghdr *nlh;
 458         long tmo;
 459
 460         nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
 461                         cb->nlh->nlmsg_type, sizeof(*r), nlmsg_flags);
 462         if (!nlh)
 463                 return -EMSGSIZE;
 464
 465         r = nlmsg_data(nlh);
 466         inet_diag_msg_common_fill(r, sk);
 467         r->idiag_state = TCP_SYN_RECV;
 468         r->idiag_timer = 1;
 469         r->idiag_retrans = reqsk->num_retrans;
 470
 471         BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
 472                      offsetof(struct sock, sk_cookie));
 473
 474         tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
 475         r->idiag_expires = jiffies_delta_to_msecs(tmo);
 476         r->idiag_rqueue = 0;
 477         r->idiag_wqueue = 0;
 478         r->idiag_uid    = 0;
 479         r->idiag_inode  = 0;
 480
 481         if (net_admin && nla_put_u32(skb, INET_DIAG_MARK,
 482                                      inet_rsk(reqsk)->ir_mark)) {
 483                 nlmsg_cancel(skb, nlh);
 484                 return -EMSGSIZE;
 485         }
 486
 487         nlmsg_end(skb, nlh);
 488         return 0;
 489 }
 490
 491 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
 492                         struct netlink_callback *cb,
 493                         const struct inet_diag_req_v2 *r,
 494                         u16 nlmsg_flags, bool net_admin)
 495 {
 496         if (sk->sk_state == TCP_TIME_WAIT)
 497                 return inet_twsk_diag_fill(sk, skb, cb, nlmsg_flags);
 498
 499         if (sk->sk_state == TCP_NEW_SYN_RECV)
 500                 return inet_req_diag_fill(sk, skb, cb, nlmsg_flags, net_admin);
 501
 502         return inet_sk_diag_fill(sk, inet_csk(sk), skb, cb, r, nlmsg_flags,
 503                                  net_admin);
 504 }
 505
 506 struct sock *inet_diag_find_one_icsk(struct net *net,
 507                                      struct inet_hashinfo *hashinfo,
 508                                      const struct inet_diag_req_v2 *req)
 509 {
 510         struct sock *sk;
 511
 512         rcu_read_lock();
 513         if (req->sdiag_family == AF_INET)
 514                 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
 515                                  req->id.idiag_dport, req->id.idiag_src[0],
 516                                  req->id.idiag_sport, req->id.idiag_if);
 517 #if IS_ENABLED(CONFIG_IPV6)
 518         else if (req->sdiag_family == AF_INET6) {
 519                 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
 520                     ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
 521                         sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
 522                                          req->id.idiag_dport, req->id.idiag_src[3],
 523                                          req->id.idiag_sport, req->id.idiag_if);
 524                 else
 525                         sk = inet6_lookup(net, hashinfo, NULL, 0,
 526                                           (struct in6_addr *)req->id.idiag_dst,
 527                                           req->id.idiag_dport,
 528                                           (struct in6_addr *)req->id.idiag_src,
 529                                           req->id.idiag_sport,
 530                                           req->id.idiag_if);
 531         }
 532 #endif
 533         else {
 534                 rcu_read_unlock();
 535                 return ERR_PTR(-EINVAL);
 536         }
 537         rcu_read_unlock();
 538         if (!sk)
 539                 return ERR_PTR(-ENOENT);
 540
 541         if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
 542                 sock_gen_put(sk);
 543                 return ERR_PTR(-ENOENT);
 544         }
 545
 546         return sk;
 547 }
 548 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
 549
 550 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
 551                             struct netlink_callback *cb,
 552                             const struct inet_diag_req_v2 *req)
 553 {
 554         struct sk_buff *in_skb = cb->skb;
 555         bool net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN);
 556         struct net *net = sock_net(in_skb->sk);
 557         struct sk_buff *rep;
 558         struct sock *sk;
 559         int err;
 560
 561         sk = inet_diag_find_one_icsk(net, hashinfo, req);
 562         if (IS_ERR(sk))
 563                 return PTR_ERR(sk);
 564
 565         rep = nlmsg_new(inet_sk_attr_size(sk, req, net_admin), GFP_KERNEL);
 566         if (!rep) {
 567                 err = -ENOMEM;
 568                 goto out;
 569         }
 570
 571         err = sk_diag_fill(sk, rep, cb, req, 0, net_admin);
 572         if (err < 0) {
 573                 WARN_ON(err == -EMSGSIZE);
 574                 nlmsg_free(rep);
 575                 goto out;
 576         }
 577         err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
 578                               MSG_DONTWAIT);
 579         if (err > 0)
 580                 err = 0;
 581
 582 out:
 583         if (sk)
 584                 sock_gen_put(sk);
 585
 586         return err;
 587 }
 588 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
 589
 590 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
 591                                const struct nlmsghdr *nlh,
 592                                int hdrlen,
 593                                const struct inet_diag_req_v2 *req)
 594 {
 595         const struct inet_diag_handler *handler;
 596         struct inet_diag_dump_data dump_data;
 597         int err, protocol;
 598
 599         memset(&dump_data, 0, sizeof(dump_data));
 600         err = inet_diag_parse_attrs(nlh, hdrlen, dump_data.req_nlas);
 601         if (err)
 602                 return err;
 603
 604         protocol = inet_diag_get_protocol(req, &dump_data);
 605
 606         handler = inet_diag_lock_handler(protocol);
 607         if (IS_ERR(handler)) {
 608                 err = PTR_ERR(handler);
 609         } else if (cmd == SOCK_DIAG_BY_FAMILY) {
 610                 struct netlink_callback cb = {
 611                         .nlh = nlh,
 612                         .skb = in_skb,
 613                         .data = &dump_data,
 614                 };
 615                 err = handler->dump_one(&cb, req);
 616         } else if (cmd == SOCK_DESTROY && handler->destroy) {
 617                 err = handler->destroy(in_skb, req);
 618         } else {
 619                 err = -EOPNOTSUPP;
 620         }
 621         inet_diag_unlock_handler(handler);
 622
 623         return err;
 624 }
 625
 626 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
 627 {
 628         int words = bits >> 5;
 629
 630         bits &= 0x1f;
 631
 632         if (words) {
 633                 if (memcmp(a1, a2, words << 2))
 634                         return 0;
 635         }
 636         if (bits) {
 637                 __be32 w1, w2;
 638                 __be32 mask;
 639
 640                 w1 = a1[words];
 641                 w2 = a2[words];
 642
 643                 mask = htonl((0xffffffff) << (32 - bits));
 644
 645                 if ((w1 ^ w2) & mask)
 646                         return 0;
 647         }
 648
 649         return 1;
 650 }
 651
 652 static int inet_diag_bc_run(const struct nlattr *_bc,
 653                             const struct inet_diag_entry *entry)
 654 {
 655         const void *bc = nla_data(_bc);
 656         int len = nla_len(_bc);
 657
 658         while (len > 0) {
 659                 int yes = 1;
 660                 const struct inet_diag_bc_op *op = bc;
 661
 662                 switch (op->code) {
 663                 case INET_DIAG_BC_NOP:
 664                         break;
 665                 case INET_DIAG_BC_JMP:
 666                         yes = 0;
 667                         break;
 668                 case INET_DIAG_BC_S_EQ:
 669                         yes = entry->sport == op[1].no;
 670                         break;
 671                 case INET_DIAG_BC_S_GE:
 672                         yes = entry->sport >= op[1].no;
 673                         break;
 674                 case INET_DIAG_BC_S_LE:
 675                         yes = entry->sport <= op[1].no;
 676                         break;
 677                 case INET_DIAG_BC_D_EQ:
 678                         yes = entry->dport == op[1].no;
 679                         break;
 680                 case INET_DIAG_BC_D_GE:
 681                         yes = entry->dport >= op[1].no;
 682                         break;
 683                 case INET_DIAG_BC_D_LE:
 684                         yes = entry->dport <= op[1].no;
 685                         break;
 686                 case INET_DIAG_BC_AUTO:
 687                         yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
 688                         break;
 689                 case INET_DIAG_BC_S_COND:
 690                 case INET_DIAG_BC_D_COND: {
 691                         const struct inet_diag_hostcond *cond;
 692                         const __be32 *addr;
 693
 694                         cond = (const struct inet_diag_hostcond *)(op + 1);
 695                         if (cond->port != -1 &&
 696                             cond->port != (op->code == INET_DIAG_BC_S_COND ?
 697                                              entry->sport : entry->dport)) {
 698                                 yes = 0;
 699                                 break;
 700                         }
 701
 702                         if (op->code == INET_DIAG_BC_S_COND)
 703                                 addr = entry->saddr;
 704                         else
 705                                 addr = entry->daddr;
 706
 707                         if (cond->family != AF_UNSPEC &&
 708                             cond->family != entry->family) {
 709                                 if (entry->family == AF_INET6 &&
 710                                     cond->family == AF_INET) {
 711                                         if (addr[0] == 0 && addr[1] == 0 &&
 712                                             addr[2] == htonl(0xffff) &&
 713                                             bitstring_match(addr + 3,
 714                                                             cond->addr,
 715                                                             cond->prefix_len))
 716                                                 break;
 717                                 }
 718                                 yes = 0;
 719                                 break;
 720                         }
 721
 722                         if (cond->prefix_len == 0)
 723                                 break;
 724                         if (bitstring_match(addr, cond->addr,
 725                                             cond->prefix_len))
 726                                 break;
 727                         yes = 0;
 728                         break;
 729                 }
 730                 case INET_DIAG_BC_DEV_COND: {
 731                         u32 ifindex;
 732
 733                         ifindex = *((const u32 *)(op + 1));
 734                         if (ifindex != entry->ifindex)
 735                                 yes = 0;
 736                         break;
 737                 }
 738                 case INET_DIAG_BC_MARK_COND: {
 739                         struct inet_diag_markcond *cond;
 740
 741                         cond = (struct inet_diag_markcond *)(op + 1);
 742                         if ((entry->mark & cond->mask) != cond->mark)
 743                                 yes = 0;
 744                         break;
 745                 }
 746 #ifdef CONFIG_SOCK_CGROUP_DATA
 747                 case INET_DIAG_BC_CGROUP_COND: {
 748                         u64 cgroup_id;
 749
 750                         cgroup_id = get_unaligned((const u64 *)(op + 1));
 751                         if (cgroup_id != entry->cgroup_id)
 752                                 yes = 0;
 753                         break;
 754                 }
 755 #endif
 756                 }
 757
 758                 if (yes) {
 759                         len -= op->yes;
 760                         bc += op->yes;
 761                 } else {
 762                         len -= op->no;
 763                         bc += op->no;
 764                 }
 765         }
 766         return len == 0;
 767 }
 768
 769 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
 770  */
 771 static void entry_fill_addrs(struct inet_diag_entry *entry,
 772                              const struct sock *sk)
 773 {
 774 #if IS_ENABLED(CONFIG_IPV6)
 775         if (sk->sk_family == AF_INET6) {
 776                 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
 777                 entry->daddr = sk->sk_v6_daddr.s6_addr32;
 778         } else
 779 #endif
 780         {
 781                 entry->saddr = &sk->sk_rcv_saddr;
 782                 entry->daddr = &sk->sk_daddr;
 783         }
 784 }
 785
 786 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
 787 {
 788         struct inet_sock *inet = inet_sk(sk);
 789         struct inet_diag_entry entry;
 790
 791         if (!bc)
 792                 return 1;
 793
 794         entry.family = sk->sk_family;
 795         entry_fill_addrs(&entry, sk);
 796         entry.sport = inet->inet_num;
 797         entry.dport = ntohs(inet->inet_dport);
 798         entry.ifindex = sk->sk_bound_dev_if;
 799         entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
 800         if (sk_fullsock(sk))
 801                 entry.mark = sk->sk_mark;
 802         else if (sk->sk_state == TCP_NEW_SYN_RECV)
 803                 entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark;
 804         else
 805                 entry.mark = 0;
 806 #ifdef CONFIG_SOCK_CGROUP_DATA
 807         entry.cgroup_id = sk_fullsock(sk) ?
 808                 cgroup_id(sock_cgroup_ptr(&sk->sk_cgrp_data)) : 0;
 809 #endif
 810
 811         return inet_diag_bc_run(bc, &entry);
 812 }
 813 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
 814
 815 static int valid_cc(const void *bc, int len, int cc)
 816 {
 817         while (len >= 0) {
 818                 const struct inet_diag_bc_op *op = bc;
 819
 820                 if (cc > len)
 821                         return 0;
 822                 if (cc == len)
 823                         return 1;
 824                 if (op->yes < 4 || op->yes & 3)
 825                         return 0;
 826                 len -= op->yes;
 827                 bc  += op->yes;
 828         }
 829         return 0;
 830 }
 831
 832 /* data is u32 ifindex */
 833 static bool valid_devcond(const struct inet_diag_bc_op *op, int len,
 834                           int *min_len)
 835 {
 836         /* Check ifindex space. */
 837         *min_len += sizeof(u32);
 838         if (len < *min_len)
 839                 return false;
 840
 841         return true;
 842 }
 843 /* Validate an inet_diag_hostcond. */
 844 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
 845                            int *min_len)
 846 {
 847         struct inet_diag_hostcond *cond;
 848         int addr_len;
 849
 850         /* Check hostcond space. */
 851         *min_len += sizeof(struct inet_diag_hostcond);
 852         if (len < *min_len)
 853                 return false;
 854         cond = (struct inet_diag_hostcond *)(op + 1);
 855
 856         /* Check address family and address length. */
 857         switch (cond->family) {
 858         case AF_UNSPEC:
 859                 addr_len = 0;
 860                 break;
 861         case AF_INET:
 862                 addr_len = sizeof(struct in_addr);
 863                 break;
 864         case AF_INET6:
 865                 addr_len = sizeof(struct in6_addr);
 866                 break;
 867         default:
 868                 return false;
 869         }
 870         *min_len += addr_len;
 871         if (len < *min_len)
 872                 return false;
 873
 874         /* Check prefix length (in bits) vs address length (in bytes). */
 875         if (cond->prefix_len > 8 * addr_len)
 876                 return false;
 877
 878         return true;
 879 }
 880
 881 /* Validate a port comparison operator. */
 882 static bool valid_port_comparison(const struct inet_diag_bc_op *op,
 883                                   int len, int *min_len)
 884 {
 885         /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
 886         *min_len += sizeof(struct inet_diag_bc_op);
 887         if (len < *min_len)
 888                 return false;
 889         return true;
 890 }
 891
 892 static bool valid_markcond(const struct inet_diag_bc_op *op, int len,
 893                            int *min_len)
 894 {
 895         *min_len += sizeof(struct inet_diag_markcond);
 896         return len >= *min_len;
 897 }
 898
 899 #ifdef CONFIG_SOCK_CGROUP_DATA
 900 static bool valid_cgroupcond(const struct inet_diag_bc_op *op, int len,
 901                              int *min_len)
 902 {
 903         *min_len += sizeof(u64);
 904         return len >= *min_len;
 905 }
 906 #endif
 907
 908 static int inet_diag_bc_audit(const struct nlattr *attr,
 909                               const struct sk_buff *skb)
 910 {
 911         bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN);
 912         const void *bytecode, *bc;
 913         int bytecode_len, len;
 914
 915         if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op))
 916                 return -EINVAL;
 917
 918         bytecode = bc = nla_data(attr);
 919         len = bytecode_len = nla_len(attr);
 920
 921         while (len > 0) {
 922                 int min_len = sizeof(struct inet_diag_bc_op);
 923                 const struct inet_diag_bc_op *op = bc;
 924
 925                 switch (op->code) {
 926                 case INET_DIAG_BC_S_COND:
 927                 case INET_DIAG_BC_D_COND:
 928                         if (!valid_hostcond(bc, len, &min_len))
 929                                 return -EINVAL;
 930                         break;
 931                 case INET_DIAG_BC_DEV_COND:
 932                         if (!valid_devcond(bc, len, &min_len))
 933                                 return -EINVAL;
 934                         break;
 935                 case INET_DIAG_BC_S_EQ:
 936                 case INET_DIAG_BC_S_GE:
 937                 case INET_DIAG_BC_S_LE:
 938                 case INET_DIAG_BC_D_EQ:
 939                 case INET_DIAG_BC_D_GE:
 940                 case INET_DIAG_BC_D_LE:
 941                         if (!valid_port_comparison(bc, len, &min_len))
 942                                 return -EINVAL;
 943                         break;
 944                 case INET_DIAG_BC_MARK_COND:
 945                         if (!net_admin)
 946                                 return -EPERM;
 947                         if (!valid_markcond(bc, len, &min_len))
 948                                 return -EINVAL;
 949                         break;
 950 #ifdef CONFIG_SOCK_CGROUP_DATA
 951                 case INET_DIAG_BC_CGROUP_COND:
 952                         if (!valid_cgroupcond(bc, len, &min_len))
 953                                 return -EINVAL;
 954                         break;
 955 #endif
 956                 case INET_DIAG_BC_AUTO:
 957                 case INET_DIAG_BC_JMP:
 958                 case INET_DIAG_BC_NOP:
 959                         break;
 960                 default:
 961                         return -EINVAL;
 962                 }
 963
 964                 if (op->code != INET_DIAG_BC_NOP) {
 965                         if (op->no < min_len || op->no > len + 4 || op->no & 3)
 966                                 return -EINVAL;
 967                         if (op->no < len &&
 968                             !valid_cc(bytecode, bytecode_len, len - op->no))
 969                                 return -EINVAL;
 970                 }
 971
 972                 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
 973                         return -EINVAL;
 974                 bc  += op->yes;
 975                 len -= op->yes;
 976         }
 977         return len == 0 ? 0 : -EINVAL;
 978 }
 979
 980 static void twsk_build_assert(void)
 981 {
 982         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
 983                      offsetof(struct sock, sk_family));
 984
 985         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
 986                      offsetof(struct inet_sock, inet_num));
 987
 988         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
 989                      offsetof(struct inet_sock, inet_dport));
 990
 991         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
 992                      offsetof(struct inet_sock, inet_rcv_saddr));
 993
 994         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
 995                      offsetof(struct inet_sock, inet_daddr));
 996
 997 #if IS_ENABLED(CONFIG_IPV6)
 998         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
 999                      offsetof(struct sock, sk_v6_rcv_saddr));
1000
1001         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
1002                      offsetof(struct sock, sk_v6_daddr));
1003 #endif
1004 }
1005
1006 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
1007                          struct netlink_callback *cb,
1008                          const struct inet_diag_req_v2 *r)
1009 {
1010         bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
1011         struct inet_diag_dump_data *cb_data = cb->data;
1012         struct net *net = sock_net(skb->sk);
1013         u32 idiag_states = r->idiag_states;
1014         int i, num, s_i, s_num;
1015         struct nlattr *bc;
1016         struct sock *sk;
1017
1018         bc = cb_data->inet_diag_nla_bc;
1019         if (idiag_states & TCPF_SYN_RECV)
1020                 idiag_states |= TCPF_NEW_SYN_RECV;
1021         s_i = cb->args[1];
1022         s_num = num = cb->args[2];
1023
1024         if (cb->args[0] == 0) {
1025                 if (!(idiag_states & TCPF_LISTEN) || r->id.idiag_dport)
1026                         goto skip_listen_ht;
1027
1028                 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
1029                         struct inet_listen_hashbucket *ilb;
1030                         struct hlist_nulls_node *node;
1031
1032                         num = 0;
1033                         ilb = &hashinfo->listening_hash[i];
1034                         spin_lock(&ilb->lock);
1035                         sk_nulls_for_each(sk, node, &ilb->nulls_head) {
1036                                 struct inet_sock *inet = inet_sk(sk);
1037
1038                                 if (!net_eq(sock_net(sk), net))
1039                                         continue;
1040
1041                                 if (num < s_num) {
1042                                         num++;
1043                                         continue;
1044                                 }
1045
1046                                 if (r->sdiag_family != AF_UNSPEC &&
1047                                     sk->sk_family != r->sdiag_family)
1048                                         goto next_listen;
1049
1050                                 if (r->id.idiag_sport != inet->inet_sport &&
1051                                     r->id.idiag_sport)
1052                                         goto next_listen;
1053
1054                                 if (!inet_diag_bc_sk(bc, sk))
1055                                         goto next_listen;
1056
1057                                 if (inet_sk_diag_fill(sk, inet_csk(sk), skb,
1058                                                       cb, r, NLM_F_MULTI,
1059                                                       net_admin) < 0) {
1060                                         spin_unlock(&ilb->lock);
1061                                         goto done;
1062                                 }
1063
1064 next_listen:
1065                                 ++num;
1066                         }
1067                         spin_unlock(&ilb->lock);
1068
1069                         s_num = 0;
1070                 }
1071 skip_listen_ht:
1072                 cb->args[0] = 1;
1073                 s_i = num = s_num = 0;
1074         }
1075
1076         if (!(idiag_states & ~TCPF_LISTEN))
1077                 goto out;
1078
1079 #define SKARR_SZ 16
1080         for (i = s_i; i <= hashinfo->ehash_mask; i++) {
1081                 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
1082                 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
1083                 struct hlist_nulls_node *node;
1084                 struct sock *sk_arr[SKARR_SZ];
1085                 int num_arr[SKARR_SZ];
1086                 int idx, accum, res;
1087
1088                 if (hlist_nulls_empty(&head->chain))
1089                         continue;
1090
1091                 if (i > s_i)
1092                         s_num = 0;
1093
1094 next_chunk:
1095                 num = 0;
1096                 accum = 0;
1097                 spin_lock_bh(lock);
1098                 sk_nulls_for_each(sk, node, &head->chain) {
1099                         int state;
1100
1101                         if (!net_eq(sock_net(sk), net))
1102                                 continue;
1103                         if (num < s_num)
1104                                 goto next_normal;
1105                         state = (sk->sk_state == TCP_TIME_WAIT) ?
1106                                 inet_twsk(sk)->tw_substate : sk->sk_state;
1107                         if (!(idiag_states & (1 << state)))
1108                                 goto next_normal;
1109                         if (r->sdiag_family != AF_UNSPEC &&
1110                             sk->sk_family != r->sdiag_family)
1111                                 goto next_normal;
1112                         if (r->id.idiag_sport != htons(sk->sk_num) &&
1113                             r->id.idiag_sport)
1114                                 goto next_normal;
1115                         if (r->id.idiag_dport != sk->sk_dport &&
1116                             r->id.idiag_dport)
1117                                 goto next_normal;
1118                         twsk_build_assert();
1119
1120                         if (!inet_diag_bc_sk(bc, sk))
1121                                 goto next_normal;
1122
1123                         if (!refcount_inc_not_zero(&sk->sk_refcnt))
1124                                 goto next_normal;
1125
1126                         num_arr[accum] = num;
1127                         sk_arr[accum] = sk;
1128                         if (++accum == SKARR_SZ)
1129                                 break;
1130 next_normal:
1131                         ++num;
1132                 }
1133                 spin_unlock_bh(lock);
1134                 res = 0;
1135                 for (idx = 0; idx < accum; idx++) {
1136                         if (res >= 0) {
1137                                 res = sk_diag_fill(sk_arr[idx], skb, cb, r,
1138                                                    NLM_F_MULTI, net_admin);
1139                                 if (res < 0)
1140                                         num = num_arr[idx];
1141                         }
1142                         sock_gen_put(sk_arr[idx]);
1143                 }
1144                 if (res < 0)
1145                         break;
1146                 cond_resched();
1147                 if (accum == SKARR_SZ) {
1148                         s_num = num + 1;
1149                         goto next_chunk;
1150                 }
1151         }
1152
1153 done:
1154         cb->args[1] = i;
1155         cb->args[2] = num;
1156 out:
1157         ;
1158 }
1159 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
1160
1161 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
1162                             const struct inet_diag_req_v2 *r)
1163 {
1164         struct inet_diag_dump_data *cb_data = cb->data;
1165         const struct inet_diag_handler *handler;
1166         u32 prev_min_dump_alloc;
1167         int protocol, err = 0;
1168
1169         protocol = inet_diag_get_protocol(r, cb_data);
1170
1171 again:
1172         prev_min_dump_alloc = cb->min_dump_alloc;
1173         handler = inet_diag_lock_handler(protocol);
1174         if (!IS_ERR(handler))
1175                 handler->dump(skb, cb, r);
1176         else
1177                 err = PTR_ERR(handler);
1178         inet_diag_unlock_handler(handler);
1179
1180         /* The skb is not large enough to fit one sk info and
1181          * inet_sk_diag_fill() has requested for a larger skb.
1182          */
1183         if (!skb->len && cb->min_dump_alloc > prev_min_dump_alloc) {
1184                 err = pskb_expand_head(skb, 0, cb->min_dump_alloc, GFP_KERNEL);
1185                 if (!err)
1186                         goto again;
1187         }
1188
1189         return err ? : skb->len;
1190 }
1191
1192 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
1193 {
1194         return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh));
1195 }
1196
1197 static int __inet_diag_dump_start(struct netlink_callback *cb, int hdrlen)
1198 {
1199         const struct nlmsghdr *nlh = cb->nlh;
1200         struct inet_diag_dump_data *cb_data;
1201         struct sk_buff *skb = cb->skb;
1202         struct nlattr *nla;
1203         int err;
1204
1205         cb_data = kzalloc(sizeof(*cb_data), GFP_KERNEL);
1206         if (!cb_data)
1207                 return -ENOMEM;
1208
1209         err = inet_diag_parse_attrs(nlh, hdrlen, cb_data->req_nlas);
1210         if (err) {
1211                 kfree(cb_data);
1212                 return err;
1213         }
1214         nla = cb_data->inet_diag_nla_bc;
1215         if (nla) {
1216                 err = inet_diag_bc_audit(nla, skb);
1217                 if (err) {
1218                         kfree(cb_data);
1219                         return err;
1220                 }
1221         }
1222
1223         nla = cb_data->inet_diag_nla_bpf_stgs;
1224         if (nla) {
1225                 struct bpf_sk_storage_diag *bpf_stg_diag;
1226
1227                 bpf_stg_diag = bpf_sk_storage_diag_alloc(nla);
1228                 if (IS_ERR(bpf_stg_diag)) {
1229                         kfree(cb_data);
1230                         return PTR_ERR(bpf_stg_diag);
1231                 }
1232                 cb_data->bpf_stg_diag = bpf_stg_diag;
1233         }
1234
1235         cb->data = cb_data;
1236         return 0;
1237 }
1238
1239 static int inet_diag_dump_start(struct netlink_callback *cb)
1240 {
1241         return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req_v2));
1242 }
1243
1244 static int inet_diag_dump_start_compat(struct netlink_callback *cb)
1245 {
1246         return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req));
1247 }
1248
1249 static int inet_diag_dump_done(struct netlink_callback *cb)
1250 {
1251         struct inet_diag_dump_data *cb_data = cb->data;
1252
1253         bpf_sk_storage_diag_free(cb_data->bpf_stg_diag);
1254         kfree(cb->data);
1255
1256         return 0;
1257 }
1258
1259 static int inet_diag_type2proto(int type)
1260 {
1261         switch (type) {
1262         case TCPDIAG_GETSOCK:
1263                 return IPPROTO_TCP;
1264         case DCCPDIAG_GETSOCK:
1265                 return IPPROTO_DCCP;
1266         default:
1267                 return 0;
1268         }
1269 }
1270
1271 static int inet_diag_dump_compat(struct sk_buff *skb,
1272                                  struct netlink_callback *cb)
1273 {
1274         struct inet_diag_req *rc = nlmsg_data(cb->nlh);
1275         struct inet_diag_req_v2 req;
1276
1277         req.sdiag_family = AF_UNSPEC; /* compatibility */
1278         req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1279         req.idiag_ext = rc->idiag_ext;
1280         req.idiag_states = rc->idiag_states;
1281         req.id = rc->id;
1282
1283         return __inet_diag_dump(skb, cb, &req);
1284 }
1285
1286 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1287                                       const struct nlmsghdr *nlh)
1288 {
1289         struct inet_diag_req *rc = nlmsg_data(nlh);
1290         struct inet_diag_req_v2 req;
1291
1292         req.sdiag_family = rc->idiag_family;
1293         req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1294         req.idiag_ext = rc->idiag_ext;
1295         req.idiag_states = rc->idiag_states;
1296         req.id = rc->id;
1297
1298         return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh,
1299                                    sizeof(struct inet_diag_req), &req);
1300 }
1301
1302 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1303 {
1304         int hdrlen = sizeof(struct inet_diag_req);
1305         struct net *net = sock_net(skb->sk);
1306
1307         if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1308             nlmsg_len(nlh) < hdrlen)
1309                 return -EINVAL;
1310
1311         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1312                 struct netlink_dump_control c = {
1313                         .start = inet_diag_dump_start_compat,
1314                         .done = inet_diag_dump_done,
1315                         .dump = inet_diag_dump_compat,
1316                 };
1317                 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1318         }
1319
1320         return inet_diag_get_exact_compat(skb, nlh);
1321 }
1322
1323 static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
1324 {
1325         int hdrlen = sizeof(struct inet_diag_req_v2);
1326         struct net *net = sock_net(skb->sk);
1327
1328         if (nlmsg_len(h) < hdrlen)
1329                 return -EINVAL;
1330
1331         if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1332             h->nlmsg_flags & NLM_F_DUMP) {
1333                 struct netlink_dump_control c = {
1334                         .start = inet_diag_dump_start,
1335                         .done = inet_diag_dump_done,
1336                         .dump = inet_diag_dump,
1337                 };
1338                 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1339         }
1340
1341         return inet_diag_cmd_exact(h->nlmsg_type, skb, h, hdrlen,
1342                                    nlmsg_data(h));
1343 }
1344
1345 static
1346 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1347 {
1348         const struct inet_diag_handler *handler;
1349         struct nlmsghdr *nlh;
1350         struct nlattr *attr;
1351         struct inet_diag_msg *r;
1352         void *info = NULL;
1353         int err = 0;
1354
1355         nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1356         if (!nlh)
1357                 return -ENOMEM;
1358
1359         r = nlmsg_data(nlh);
1360         memset(r, 0, sizeof(*r));
1361         inet_diag_msg_common_fill(r, sk);
1362         if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1363                 r->id.idiag_sport = inet_sk(sk)->inet_sport;
1364         r->idiag_state = sk->sk_state;
1365
1366         if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1367                 nlmsg_cancel(skb, nlh);
1368                 return err;
1369         }
1370
1371         handler = inet_diag_lock_handler(sk->sk_protocol);
1372         if (IS_ERR(handler)) {
1373                 inet_diag_unlock_handler(handler);
1374                 nlmsg_cancel(skb, nlh);
1375                 return PTR_ERR(handler);
1376         }
1377
1378         attr = handler->idiag_info_size
1379                 ? nla_reserve_64bit(skb, INET_DIAG_INFO,
1380                                     handler->idiag_info_size,
1381                                     INET_DIAG_PAD)
1382                 : NULL;
1383         if (attr)
1384                 info = nla_data(attr);
1385
1386         handler->idiag_get_info(sk, r, info);
1387         inet_diag_unlock_handler(handler);
1388
1389         nlmsg_end(skb, nlh);
1390         return 0;
1391 }
1392
1393 static const struct sock_diag_handler inet_diag_handler = {
1394         .family = AF_INET,
1395         .dump = inet_diag_handler_cmd,
1396         .get_info = inet_diag_handler_get_info,
1397         .destroy = inet_diag_handler_cmd,
1398 };
1399
1400 static const struct sock_diag_handler inet6_diag_handler = {
1401         .family = AF_INET6,
1402         .dump = inet_diag_handler_cmd,
1403         .get_info = inet_diag_handler_get_info,
1404         .destroy = inet_diag_handler_cmd,
1405 };
1406
1407 int inet_diag_register(const struct inet_diag_handler *h)
1408 {
1409         const __u16 type = h->idiag_type;
1410         int err = -EINVAL;
1411
1412         if (type >= IPPROTO_MAX)
1413                 goto out;
1414
1415         mutex_lock(&inet_diag_table_mutex);
1416         err = -EEXIST;
1417         if (!inet_diag_table[type]) {
1418                 inet_diag_table[type] = h;
1419                 err = 0;
1420         }
1421         mutex_unlock(&inet_diag_table_mutex);
1422 out:
1423         return err;
1424 }
1425 EXPORT_SYMBOL_GPL(inet_diag_register);
1426
1427 void inet_diag_unregister(const struct inet_diag_handler *h)
1428 {
1429         const __u16 type = h->idiag_type;
1430
1431         if (type >= IPPROTO_MAX)
1432                 return;
1433
1434         mutex_lock(&inet_diag_table_mutex);
1435         inet_diag_table[type] = NULL;
1436         mutex_unlock(&inet_diag_table_mutex);
1437 }
1438 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1439
1440 static int __init inet_diag_init(void)
1441 {
1442         const int inet_diag_table_size = (IPPROTO_MAX *
1443                                           sizeof(struct inet_diag_handler *));
1444         int err = -ENOMEM;
1445
1446         inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1447         if (!inet_diag_table)
1448                 goto out;
1449
1450         err = sock_diag_register(&inet_diag_handler);
1451         if (err)
1452                 goto out_free_nl;
1453
1454         err = sock_diag_register(&inet6_diag_handler);
1455         if (err)
1456                 goto out_free_inet;
1457
1458         sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1459 out:
1460         return err;
1461
1462 out_free_inet:
1463         sock_diag_unregister(&inet_diag_handler);
1464 out_free_nl:
1465         kfree(inet_diag_table);
1466         goto out;
1467 }
1468
1469 static void __exit inet_diag_exit(void)
1470 {
1471         sock_diag_unregister(&inet6_diag_handler);
1472         sock_diag_unregister(&inet_diag_handler);
1473         sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1474         kfree(inet_diag_table);
1475 }
1476
1477 module_init(inet_diag_init);
1478 module_exit(inet_diag_exit);
1479 MODULE_LICENSE("GPL");
1480 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1481 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);