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