net/ipv4/inet_diag.c

   1 /*
   2  * inet_diag.c  Module for monitoring INET transport protocols sockets.
   3  *
   4  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
   5  *
   6  *      This program is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU General Public License
   8  *      as published by the Free Software Foundation; either version
   9  *      2 of the License, or (at your option) any later version.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/types.h>
  15 #include <linux/fcntl.h>
  16 #include <linux/random.h>
  17 #include <linux/slab.h>
  18 #include <linux/cache.h>
  19 #include <linux/init.h>
  20 #include <linux/time.h>
  21
  22 #include <net/icmp.h>
  23 #include <net/tcp.h>
  24 #include <net/ipv6.h>
  25 #include <net/inet_common.h>
  26 #include <net/inet_connection_sock.h>
  27 #include <net/inet_hashtables.h>
  28 #include <net/inet_timewait_sock.h>
  29 #include <net/inet6_hashtables.h>
  30 #include <net/netlink.h>
  31
  32 #include <linux/inet.h>
  33 #include <linux/stddef.h>
  34
  35 #include <linux/inet_diag.h>
  36 #include <linux/sock_diag.h>
  37
  38 static const struct inet_diag_handler **inet_diag_table;
  39
  40 struct inet_diag_entry {
  41         const __be32 *saddr;
  42         const __be32 *daddr;
  43         u16 sport;
  44         u16 dport;
  45         u16 family;
  46         u16 userlocks;
  47         u32 ifindex;
  48         u32 mark;
  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 (!inet_diag_table[proto])
  56                 request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
  57                                NETLINK_SOCK_DIAG, AF_INET, proto);
  58
  59         mutex_lock(&inet_diag_table_mutex);
  60         if (!inet_diag_table[proto])
  61                 return ERR_PTR(-ENOENT);
  62
  63         return inet_diag_table[proto];
  64 }
  65
  66 static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
  67 {
  68         mutex_unlock(&inet_diag_table_mutex);
  69 }
  70
  71 static void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk)
  72 {
  73         r->idiag_family = sk->sk_family;
  74
  75         r->id.idiag_sport = htons(sk->sk_num);
  76         r->id.idiag_dport = sk->sk_dport;
  77         r->id.idiag_if = sk->sk_bound_dev_if;
  78         sock_diag_save_cookie(sk, r->id.idiag_cookie);
  79
  80 #if IS_ENABLED(CONFIG_IPV6)
  81         if (sk->sk_family == AF_INET6) {
  82                 *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
  83                 *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
  84         } else
  85 #endif
  86         {
  87         memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
  88         memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
  89
  90         r->id.idiag_src[0] = sk->sk_rcv_saddr;
  91         r->id.idiag_dst[0] = sk->sk_daddr;
  92         }
  93 }
  94
  95 static size_t inet_sk_attr_size(void)
  96 {
  97         return    nla_total_size(sizeof(struct tcp_info))
  98                 + nla_total_size(1) /* INET_DIAG_SHUTDOWN */
  99                 + nla_total_size(1) /* INET_DIAG_TOS */
 100                 + nla_total_size(1) /* INET_DIAG_TCLASS */
 101                 + nla_total_size(sizeof(struct inet_diag_meminfo))
 102                 + nla_total_size(sizeof(struct inet_diag_msg))
 103                 + nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
 104                 + nla_total_size(TCP_CA_NAME_MAX)
 105                 + nla_total_size(sizeof(struct tcpvegas_info))
 106                 + 64;
 107 }
 108
 109 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
 110                       struct sk_buff *skb, const struct inet_diag_req_v2 *req,
 111                       struct user_namespace *user_ns,
 112                       u32 portid, u32 seq, u16 nlmsg_flags,
 113                       const struct nlmsghdr *unlh)
 114 {
 115         const struct inet_sock *inet = inet_sk(sk);
 116         const struct tcp_congestion_ops *ca_ops;
 117         const struct inet_diag_handler *handler;
 118         int ext = req->idiag_ext;
 119         struct inet_diag_msg *r;
 120         struct nlmsghdr  *nlh;
 121         struct nlattr *attr;
 122         void *info = NULL;
 123
 124         handler = inet_diag_table[req->sdiag_protocol];
 125         BUG_ON(!handler);
 126
 127         nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
 128                         nlmsg_flags);
 129         if (!nlh)
 130                 return -EMSGSIZE;
 131
 132         r = nlmsg_data(nlh);
 133         BUG_ON(!sk_fullsock(sk));
 134
 135         inet_diag_msg_common_fill(r, sk);
 136         r->idiag_state = sk->sk_state;
 137         r->idiag_timer = 0;
 138         r->idiag_retrans = 0;
 139
 140         if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
 141                 goto errout;
 142
 143         /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
 144          * hence this needs to be included regardless of socket family.
 145          */
 146         if (ext & (1 << (INET_DIAG_TOS - 1)))
 147                 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
 148                         goto errout;
 149
 150 #if IS_ENABLED(CONFIG_IPV6)
 151         if (r->idiag_family == AF_INET6) {
 152                 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
 153                         if (nla_put_u8(skb, INET_DIAG_TCLASS,
 154                                        inet6_sk(sk)->tclass) < 0)
 155                                 goto errout;
 156
 157                 if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
 158                     nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
 159                         goto errout;
 160         }
 161 #endif
 162
 163         r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
 164         r->idiag_inode = sock_i_ino(sk);
 165
 166         if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
 167                 struct inet_diag_meminfo minfo = {
 168                         .idiag_rmem = sk_rmem_alloc_get(sk),
 169                         .idiag_wmem = sk->sk_wmem_queued,
 170                         .idiag_fmem = sk->sk_forward_alloc,
 171                         .idiag_tmem = sk_wmem_alloc_get(sk),
 172                 };
 173
 174                 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
 175                         goto errout;
 176         }
 177
 178         if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
 179                 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
 180                         goto errout;
 181
 182         if (!icsk) {
 183                 handler->idiag_get_info(sk, r, NULL);
 184                 goto out;
 185         }
 186
 187 #define EXPIRES_IN_MS(tmo)  DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
 188
 189         if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
 190             icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
 191             icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
 192                 r->idiag_timer = 1;
 193                 r->idiag_retrans = icsk->icsk_retransmits;
 194                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
 195         } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
 196                 r->idiag_timer = 4;
 197                 r->idiag_retrans = icsk->icsk_probes_out;
 198                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
 199         } else if (timer_pending(&sk->sk_timer)) {
 200                 r->idiag_timer = 2;
 201                 r->idiag_retrans = icsk->icsk_probes_out;
 202                 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
 203         } else {
 204                 r->idiag_timer = 0;
 205                 r->idiag_expires = 0;
 206         }
 207 #undef EXPIRES_IN_MS
 208
 209         if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
 210                 attr = nla_reserve(skb, INET_DIAG_INFO,
 211                                    handler->idiag_info_size);
 212                 if (!attr)
 213                         goto errout;
 214
 215                 info = nla_data(attr);
 216         }
 217
 218         if (ext & (1 << (INET_DIAG_CONG - 1))) {
 219                 int err = 0;
 220
 221                 rcu_read_lock();
 222                 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
 223                 if (ca_ops)
 224                         err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
 225                 rcu_read_unlock();
 226                 if (err < 0)
 227                         goto errout;
 228         }
 229
 230         handler->idiag_get_info(sk, r, info);
 231
 232         if (sk->sk_state < TCP_TIME_WAIT) {
 233                 union tcp_cc_info info;
 234                 size_t sz = 0;
 235                 int attr;
 236
 237                 rcu_read_lock();
 238                 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
 239                 if (ca_ops && ca_ops->get_info)
 240                         sz = ca_ops->get_info(sk, ext, &attr, &info);
 241                 rcu_read_unlock();
 242                 if (sz && nla_put(skb, attr, sz, &info) < 0)
 243                         goto errout;
 244         }
 245
 246 out:
 247         nlmsg_end(skb, nlh);
 248         return 0;
 249
 250 errout:
 251         nlmsg_cancel(skb, nlh);
 252         return -EMSGSIZE;
 253 }
 254 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
 255
 256 static int inet_csk_diag_fill(struct sock *sk,
 257                               struct sk_buff *skb,
 258                               const struct inet_diag_req_v2 *req,
 259                               struct user_namespace *user_ns,
 260                               u32 portid, u32 seq, u16 nlmsg_flags,
 261                               const struct nlmsghdr *unlh)
 262 {
 263         return inet_sk_diag_fill(sk, inet_csk(sk), skb, req,
 264                                  user_ns, portid, seq, nlmsg_flags, unlh);
 265 }
 266
 267 static int inet_twsk_diag_fill(struct sock *sk,
 268                                struct sk_buff *skb,
 269                                u32 portid, u32 seq, u16 nlmsg_flags,
 270                                const struct nlmsghdr *unlh)
 271 {
 272         struct inet_timewait_sock *tw = inet_twsk(sk);
 273         struct inet_diag_msg *r;
 274         struct nlmsghdr *nlh;
 275         long tmo;
 276
 277         nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
 278                         nlmsg_flags);
 279         if (!nlh)
 280                 return -EMSGSIZE;
 281
 282         r = nlmsg_data(nlh);
 283         BUG_ON(tw->tw_state != TCP_TIME_WAIT);
 284
 285         tmo = tw->tw_timer.expires - jiffies;
 286         if (tmo < 0)
 287                 tmo = 0;
 288
 289         inet_diag_msg_common_fill(r, sk);
 290         r->idiag_retrans      = 0;
 291
 292         r->idiag_state        = tw->tw_substate;
 293         r->idiag_timer        = 3;
 294         r->idiag_expires      = jiffies_to_msecs(tmo);
 295         r->idiag_rqueue       = 0;
 296         r->idiag_wqueue       = 0;
 297         r->idiag_uid          = 0;
 298         r->idiag_inode        = 0;
 299
 300         nlmsg_end(skb, nlh);
 301         return 0;
 302 }
 303
 304 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
 305                               u32 portid, u32 seq, u16 nlmsg_flags,
 306                               const struct nlmsghdr *unlh)
 307 {
 308         struct inet_diag_msg *r;
 309         struct nlmsghdr *nlh;
 310         long tmo;
 311
 312         nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
 313                         nlmsg_flags);
 314         if (!nlh)
 315                 return -EMSGSIZE;
 316
 317         r = nlmsg_data(nlh);
 318         inet_diag_msg_common_fill(r, sk);
 319         r->idiag_state = TCP_SYN_RECV;
 320         r->idiag_timer = 1;
 321         r->idiag_retrans = inet_reqsk(sk)->num_retrans;
 322
 323         BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
 324                      offsetof(struct sock, sk_cookie));
 325
 326         tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
 327         r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0;
 328         r->idiag_rqueue = 0;
 329         r->idiag_wqueue = 0;
 330         r->idiag_uid    = 0;
 331         r->idiag_inode  = 0;
 332
 333         nlmsg_end(skb, nlh);
 334         return 0;
 335 }
 336
 337 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
 338                         const struct inet_diag_req_v2 *r,
 339                         struct user_namespace *user_ns,
 340                         u32 portid, u32 seq, u16 nlmsg_flags,
 341                         const struct nlmsghdr *unlh)
 342 {
 343         if (sk->sk_state == TCP_TIME_WAIT)
 344                 return inet_twsk_diag_fill(sk, skb, portid, seq,
 345                                            nlmsg_flags, unlh);
 346
 347         if (sk->sk_state == TCP_NEW_SYN_RECV)
 348                 return inet_req_diag_fill(sk, skb, portid, seq,
 349                                           nlmsg_flags, unlh);
 350
 351         return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
 352                                   nlmsg_flags, unlh);
 353 }
 354
 355 struct sock *inet_diag_find_one_icsk(struct net *net,
 356                                      struct inet_hashinfo *hashinfo,
 357                                      const struct inet_diag_req_v2 *req)
 358 {
 359         struct sock *sk;
 360
 361         if (req->sdiag_family == AF_INET)
 362                 sk = inet_lookup(net, hashinfo, req->id.idiag_dst[0],
 363                                  req->id.idiag_dport, req->id.idiag_src[0],
 364                                  req->id.idiag_sport, req->id.idiag_if);
 365 #if IS_ENABLED(CONFIG_IPV6)
 366         else if (req->sdiag_family == AF_INET6) {
 367                 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
 368                     ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
 369                         sk = inet_lookup(net, hashinfo, req->id.idiag_dst[3],
 370                                          req->id.idiag_dport, req->id.idiag_src[3],
 371                                          req->id.idiag_sport, req->id.idiag_if);
 372                 else
 373                         sk = inet6_lookup(net, hashinfo,
 374                                           (struct in6_addr *)req->id.idiag_dst,
 375                                           req->id.idiag_dport,
 376                                           (struct in6_addr *)req->id.idiag_src,
 377                                           req->id.idiag_sport,
 378                                           req->id.idiag_if);
 379         }
 380 #endif
 381         else
 382                 return ERR_PTR(-EINVAL);
 383
 384         if (!sk)
 385                 return ERR_PTR(-ENOENT);
 386
 387         if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
 388                 sock_gen_put(sk);
 389                 return ERR_PTR(-ENOENT);
 390         }
 391
 392         return sk;
 393 }
 394 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
 395
 396 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
 397                             struct sk_buff *in_skb,
 398                             const struct nlmsghdr *nlh,
 399                             const struct inet_diag_req_v2 *req)
 400 {
 401         struct net *net = sock_net(in_skb->sk);
 402         struct sk_buff *rep;
 403         struct sock *sk;
 404         int err;
 405
 406         sk = inet_diag_find_one_icsk(net, hashinfo, req);
 407         if (IS_ERR(sk))
 408                 return PTR_ERR(sk);
 409
 410         rep = nlmsg_new(inet_sk_attr_size(), GFP_KERNEL);
 411         if (!rep) {
 412                 err = -ENOMEM;
 413                 goto out;
 414         }
 415
 416         err = sk_diag_fill(sk, rep, req,
 417                            sk_user_ns(NETLINK_CB(in_skb).sk),
 418                            NETLINK_CB(in_skb).portid,
 419                            nlh->nlmsg_seq, 0, nlh);
 420         if (err < 0) {
 421                 WARN_ON(err == -EMSGSIZE);
 422                 nlmsg_free(rep);
 423                 goto out;
 424         }
 425         err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
 426                               MSG_DONTWAIT);
 427         if (err > 0)
 428                 err = 0;
 429
 430 out:
 431         if (sk)
 432                 sock_gen_put(sk);
 433
 434         return err;
 435 }
 436 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
 437
 438 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
 439                                const struct nlmsghdr *nlh,
 440                                const struct inet_diag_req_v2 *req)
 441 {
 442         const struct inet_diag_handler *handler;
 443         int err;
 444
 445         handler = inet_diag_lock_handler(req->sdiag_protocol);
 446         if (IS_ERR(handler))
 447                 err = PTR_ERR(handler);
 448         else if (cmd == SOCK_DIAG_BY_FAMILY)
 449                 err = handler->dump_one(in_skb, nlh, req);
 450         else if (cmd == SOCK_DESTROY_BACKPORT && handler->destroy)
 451                 err = handler->destroy(in_skb, req);
 452         else
 453                 err = -EOPNOTSUPP;
 454         inet_diag_unlock_handler(handler);
 455
 456         return err;
 457 }
 458
 459 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
 460 {
 461         int words = bits >> 5;
 462
 463         bits &= 0x1f;
 464
 465         if (words) {
 466                 if (memcmp(a1, a2, words << 2))
 467                         return 0;
 468         }
 469         if (bits) {
 470                 __be32 w1, w2;
 471                 __be32 mask;
 472
 473                 w1 = a1[words];
 474                 w2 = a2[words];
 475
 476                 mask = htonl((0xffffffff) << (32 - bits));
 477
 478                 if ((w1 ^ w2) & mask)
 479                         return 0;
 480         }
 481
 482         return 1;
 483 }
 484
 485 static int inet_diag_bc_run(const struct nlattr *_bc,
 486                             const struct inet_diag_entry *entry)
 487 {
 488         const void *bc = nla_data(_bc);
 489         int len = nla_len(_bc);
 490
 491         while (len > 0) {
 492                 int yes = 1;
 493                 const struct inet_diag_bc_op *op = bc;
 494
 495                 switch (op->code) {
 496                 case INET_DIAG_BC_NOP:
 497                         break;
 498                 case INET_DIAG_BC_JMP:
 499                         yes = 0;
 500                         break;
 501                 case INET_DIAG_BC_S_GE:
 502                         yes = entry->sport >= op[1].no;
 503                         break;
 504                 case INET_DIAG_BC_S_LE:
 505                         yes = entry->sport <= op[1].no;
 506                         break;
 507                 case INET_DIAG_BC_D_GE:
 508                         yes = entry->dport >= op[1].no;
 509                         break;
 510                 case INET_DIAG_BC_D_LE:
 511                         yes = entry->dport <= op[1].no;
 512                         break;
 513                 case INET_DIAG_BC_AUTO:
 514                         yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
 515                         break;
 516                 case INET_DIAG_BC_S_COND:
 517                 case INET_DIAG_BC_D_COND: {
 518                         const struct inet_diag_hostcond *cond;
 519                         const __be32 *addr;
 520
 521                         cond = (const struct inet_diag_hostcond *)(op + 1);
 522                         if (cond->port != -1 &&
 523                             cond->port != (op->code == INET_DIAG_BC_S_COND ?
 524                                              entry->sport : entry->dport)) {
 525                                 yes = 0;
 526                                 break;
 527                         }
 528
 529                         if (op->code == INET_DIAG_BC_S_COND)
 530                                 addr = entry->saddr;
 531                         else
 532                                 addr = entry->daddr;
 533
 534                         if (cond->family != AF_UNSPEC &&
 535                             cond->family != entry->family) {
 536                                 if (entry->family == AF_INET6 &&
 537                                     cond->family == AF_INET) {
 538                                         if (addr[0] == 0 && addr[1] == 0 &&
 539                                             addr[2] == htonl(0xffff) &&
 540                                             bitstring_match(addr + 3,
 541                                                             cond->addr,
 542                                                             cond->prefix_len))
 543                                                 break;
 544                                 }
 545                                 yes = 0;
 546                                 break;
 547                         }
 548
 549                         if (cond->prefix_len == 0)
 550                                 break;
 551                         if (bitstring_match(addr, cond->addr,
 552                                             cond->prefix_len))
 553                                 break;
 554                         yes = 0;
 555                         break;
 556                 }
 557                 case INET_DIAG_BC_DEV_COND: {
 558                         u32 ifindex;
 559
 560                         ifindex = *((const u32 *)(op + 1));
 561                         if (ifindex != entry->ifindex)
 562                                 yes = 0;
 563                         break;
 564                 }
 565                 case INET_DIAG_BC_MARK_COND: {
 566                         struct inet_diag_markcond *cond;
 567
 568                         cond = (struct inet_diag_markcond *)(op + 1);
 569                         if ((entry->mark & cond->mask) != cond->mark)
 570                                 yes = 0;
 571                         break;
 572                 }
 573                 }
 574
 575                 if (yes) {
 576                         len -= op->yes;
 577                         bc += op->yes;
 578                 } else {
 579                         len -= op->no;
 580                         bc += op->no;
 581                 }
 582         }
 583         return len == 0;
 584 }
 585
 586 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
 587  */
 588 static void entry_fill_addrs(struct inet_diag_entry *entry,
 589                              const struct sock *sk)
 590 {
 591 #if IS_ENABLED(CONFIG_IPV6)
 592         if (sk->sk_family == AF_INET6) {
 593                 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
 594                 entry->daddr = sk->sk_v6_daddr.s6_addr32;
 595         } else
 596 #endif
 597         {
 598                 entry->saddr = &sk->sk_rcv_saddr;
 599                 entry->daddr = &sk->sk_daddr;
 600         }
 601 }
 602
 603 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
 604 {
 605         struct inet_sock *inet = inet_sk(sk);
 606         struct inet_diag_entry entry;
 607
 608         if (!bc)
 609                 return 1;
 610
 611         entry.family = sk->sk_family;
 612         entry_fill_addrs(&entry, sk);
 613         entry.sport = inet->inet_num;
 614         entry.dport = ntohs(inet->inet_dport);
 615         entry.ifindex = sk->sk_bound_dev_if;
 616         entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
 617         if (sk_fullsock(sk))
 618                 entry.mark = sk->sk_mark;
 619         else if (sk->sk_state == TCP_NEW_SYN_RECV)
 620                 entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark;
 621         else
 622                 entry.mark = 0;
 623
 624         return inet_diag_bc_run(bc, &entry);
 625 }
 626 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
 627
 628 static int valid_cc(const void *bc, int len, int cc)
 629 {
 630         while (len >= 0) {
 631                 const struct inet_diag_bc_op *op = bc;
 632
 633                 if (cc > len)
 634                         return 0;
 635                 if (cc == len)
 636                         return 1;
 637                 if (op->yes < 4 || op->yes & 3)
 638                         return 0;
 639                 len -= op->yes;
 640                 bc  += op->yes;
 641         }
 642         return 0;
 643 }
 644
 645 /* data is u32 ifindex */
 646 static bool valid_devcond(const struct inet_diag_bc_op *op, int len,
 647                           int *min_len)
 648 {
 649         /* Check ifindex space. */
 650         *min_len += sizeof(u32);
 651         if (len < *min_len)
 652                 return false;
 653
 654         return true;
 655 }
 656 /* Validate an inet_diag_hostcond. */
 657 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
 658                            int *min_len)
 659 {
 660         struct inet_diag_hostcond *cond;
 661         int addr_len;
 662
 663         /* Check hostcond space. */
 664         *min_len += sizeof(struct inet_diag_hostcond);
 665         if (len < *min_len)
 666                 return false;
 667         cond = (struct inet_diag_hostcond *)(op + 1);
 668
 669         /* Check address family and address length. */
 670         switch (cond->family) {
 671         case AF_UNSPEC:
 672                 addr_len = 0;
 673                 break;
 674         case AF_INET:
 675                 addr_len = sizeof(struct in_addr);
 676                 break;
 677         case AF_INET6:
 678                 addr_len = sizeof(struct in6_addr);
 679                 break;
 680         default:
 681                 return false;
 682         }
 683         *min_len += addr_len;
 684         if (len < *min_len)
 685                 return false;
 686
 687         /* Check prefix length (in bits) vs address length (in bytes). */
 688         if (cond->prefix_len > 8 * addr_len)
 689                 return false;
 690
 691         return true;
 692 }
 693
 694 /* Validate a port comparison operator. */
 695 static bool valid_port_comparison(const struct inet_diag_bc_op *op,
 696                                   int len, int *min_len)
 697 {
 698         /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
 699         *min_len += sizeof(struct inet_diag_bc_op);
 700         if (len < *min_len)
 701                 return false;
 702         return true;
 703 }
 704
 705 static bool valid_markcond(const struct inet_diag_bc_op *op, int len,
 706                            int *min_len)
 707 {
 708         *min_len += sizeof(struct inet_diag_markcond);
 709         return len >= *min_len;
 710 }
 711
 712 static int inet_diag_bc_audit(const struct nlattr *attr,
 713                               const struct sk_buff *skb)
 714 {
 715         bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN);
 716         const void *bytecode, *bc;
 717         int bytecode_len, len;
 718
 719         if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op))
 720                 return -EINVAL;
 721
 722         bytecode = bc = nla_data(attr);
 723         len = bytecode_len = nla_len(attr);
 724
 725         while (len > 0) {
 726                 int min_len = sizeof(struct inet_diag_bc_op);
 727                 const struct inet_diag_bc_op *op = bc;
 728
 729                 switch (op->code) {
 730                 case INET_DIAG_BC_S_COND:
 731                 case INET_DIAG_BC_D_COND:
 732                         if (!valid_hostcond(bc, len, &min_len))
 733                                 return -EINVAL;
 734                         break;
 735                 case INET_DIAG_BC_DEV_COND:
 736                         if (!valid_devcond(bc, len, &min_len))
 737                                 return -EINVAL;
 738                         break;
 739                 case INET_DIAG_BC_S_GE:
 740                 case INET_DIAG_BC_S_LE:
 741                 case INET_DIAG_BC_D_GE:
 742                 case INET_DIAG_BC_D_LE:
 743                         if (!valid_port_comparison(bc, len, &min_len))
 744                                 return -EINVAL;
 745                         break;
 746                 case INET_DIAG_BC_MARK_COND:
 747                         if (!net_admin)
 748                                 return -EPERM;
 749                         if (!valid_markcond(bc, len, &min_len))
 750                                 return -EINVAL;
 751                         break;
 752                 case INET_DIAG_BC_AUTO:
 753                 case INET_DIAG_BC_JMP:
 754                 case INET_DIAG_BC_NOP:
 755                         break;
 756                 default:
 757                         return -EINVAL;
 758                 }
 759
 760                 if (op->code != INET_DIAG_BC_NOP) {
 761                         if (op->no < min_len || op->no > len + 4 || op->no & 3)
 762                                 return -EINVAL;
 763                         if (op->no < len &&
 764                             !valid_cc(bytecode, bytecode_len, len - op->no))
 765                                 return -EINVAL;
 766                 }
 767
 768                 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
 769                         return -EINVAL;
 770                 bc  += op->yes;
 771                 len -= op->yes;
 772         }
 773         return len == 0 ? 0 : -EINVAL;
 774 }
 775
 776 static int inet_csk_diag_dump(struct sock *sk,
 777                               struct sk_buff *skb,
 778                               struct netlink_callback *cb,
 779                               const struct inet_diag_req_v2 *r,
 780                               const struct nlattr *bc)
 781 {
 782         if (!inet_diag_bc_sk(bc, sk))
 783                 return 0;
 784
 785         return inet_csk_diag_fill(sk, skb, r,
 786                                   sk_user_ns(NETLINK_CB(cb->skb).sk),
 787                                   NETLINK_CB(cb->skb).portid,
 788                                   cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
 789 }
 790
 791 static void twsk_build_assert(void)
 792 {
 793         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
 794                      offsetof(struct sock, sk_family));
 795
 796         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
 797                      offsetof(struct inet_sock, inet_num));
 798
 799         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
 800                      offsetof(struct inet_sock, inet_dport));
 801
 802         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
 803                      offsetof(struct inet_sock, inet_rcv_saddr));
 804
 805         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
 806                      offsetof(struct inet_sock, inet_daddr));
 807
 808 #if IS_ENABLED(CONFIG_IPV6)
 809         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
 810                      offsetof(struct sock, sk_v6_rcv_saddr));
 811
 812         BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
 813                      offsetof(struct sock, sk_v6_daddr));
 814 #endif
 815 }
 816
 817 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
 818                          struct netlink_callback *cb,
 819                          const struct inet_diag_req_v2 *r, struct nlattr *bc)
 820 {
 821         struct net *net = sock_net(skb->sk);
 822         int i, num, s_i, s_num;
 823         u32 idiag_states = r->idiag_states;
 824
 825         if (idiag_states & TCPF_SYN_RECV)
 826                 idiag_states |= TCPF_NEW_SYN_RECV;
 827         s_i = cb->args[1];
 828         s_num = num = cb->args[2];
 829
 830         if (cb->args[0] == 0) {
 831                 if (!(idiag_states & TCPF_LISTEN))
 832                         goto skip_listen_ht;
 833
 834                 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
 835                         struct inet_listen_hashbucket *ilb;
 836                         struct hlist_nulls_node *node;
 837                         struct sock *sk;
 838
 839                         num = 0;
 840                         ilb = &hashinfo->listening_hash[i];
 841                         spin_lock_bh(&ilb->lock);
 842                         sk_nulls_for_each(sk, node, &ilb->head) {
 843                                 struct inet_sock *inet = inet_sk(sk);
 844
 845                                 if (!net_eq(sock_net(sk), net))
 846                                         continue;
 847
 848                                 if (num < s_num) {
 849                                         num++;
 850                                         continue;
 851                                 }
 852
 853                                 if (r->sdiag_family != AF_UNSPEC &&
 854                                     sk->sk_family != r->sdiag_family)
 855                                         goto next_listen;
 856
 857                                 if (r->id.idiag_sport != inet->inet_sport &&
 858                                     r->id.idiag_sport)
 859                                         goto next_listen;
 860
 861                                 if (r->id.idiag_dport ||
 862                                     cb->args[3] > 0)
 863                                         goto next_listen;
 864
 865                                 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
 866                                         spin_unlock_bh(&ilb->lock);
 867                                         goto done;
 868                                 }
 869
 870 next_listen:
 871                                 cb->args[3] = 0;
 872                                 cb->args[4] = 0;
 873                                 ++num;
 874                         }
 875                         spin_unlock_bh(&ilb->lock);
 876
 877                         s_num = 0;
 878                         cb->args[3] = 0;
 879                         cb->args[4] = 0;
 880                 }
 881 skip_listen_ht:
 882                 cb->args[0] = 1;
 883                 s_i = num = s_num = 0;
 884         }
 885
 886         if (!(idiag_states & ~TCPF_LISTEN))
 887                 goto out;
 888
 889         for (i = s_i; i <= hashinfo->ehash_mask; i++) {
 890                 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
 891                 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
 892                 struct hlist_nulls_node *node;
 893                 struct sock *sk;
 894
 895                 num = 0;
 896
 897                 if (hlist_nulls_empty(&head->chain))
 898                         continue;
 899
 900                 if (i > s_i)
 901                         s_num = 0;
 902
 903                 spin_lock_bh(lock);
 904                 sk_nulls_for_each(sk, node, &head->chain) {
 905                         int state, res;
 906
 907                         if (!net_eq(sock_net(sk), net))
 908                                 continue;
 909                         if (num < s_num)
 910                                 goto next_normal;
 911                         state = (sk->sk_state == TCP_TIME_WAIT) ?
 912                                 inet_twsk(sk)->tw_substate : sk->sk_state;
 913                         if (!(idiag_states & (1 << state)))
 914                                 goto next_normal;
 915                         if (r->sdiag_family != AF_UNSPEC &&
 916                             sk->sk_family != r->sdiag_family)
 917                                 goto next_normal;
 918                         if (r->id.idiag_sport != htons(sk->sk_num) &&
 919                             r->id.idiag_sport)
 920                                 goto next_normal;
 921                         if (r->id.idiag_dport != sk->sk_dport &&
 922                             r->id.idiag_dport)
 923                                 goto next_normal;
 924                         twsk_build_assert();
 925
 926                         if (!inet_diag_bc_sk(bc, sk))
 927                                 goto next_normal;
 928
 929                         res = sk_diag_fill(sk, skb, r,
 930                                            sk_user_ns(NETLINK_CB(cb->skb).sk),
 931                                            NETLINK_CB(cb->skb).portid,
 932                                            cb->nlh->nlmsg_seq, NLM_F_MULTI,
 933                                            cb->nlh);
 934                         if (res < 0) {
 935                                 spin_unlock_bh(lock);
 936                                 goto done;
 937                         }
 938 next_normal:
 939                         ++num;
 940                 }
 941
 942                 spin_unlock_bh(lock);
 943         }
 944
 945 done:
 946         cb->args[1] = i;
 947         cb->args[2] = num;
 948 out:
 949         ;
 950 }
 951 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
 952
 953 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
 954                             const struct inet_diag_req_v2 *r,
 955                             struct nlattr *bc)
 956 {
 957         const struct inet_diag_handler *handler;
 958         int err = 0;
 959
 960         handler = inet_diag_lock_handler(r->sdiag_protocol);
 961         if (!IS_ERR(handler))
 962                 handler->dump(skb, cb, r, bc);
 963         else
 964                 err = PTR_ERR(handler);
 965         inet_diag_unlock_handler(handler);
 966
 967         return err ? : skb->len;
 968 }
 969
 970 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
 971 {
 972         int hdrlen = sizeof(struct inet_diag_req_v2);
 973         struct nlattr *bc = NULL;
 974
 975         if (nlmsg_attrlen(cb->nlh, hdrlen))
 976                 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
 977
 978         return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
 979 }
 980
 981 static int inet_diag_type2proto(int type)
 982 {
 983         switch (type) {
 984         case TCPDIAG_GETSOCK:
 985                 return IPPROTO_TCP;
 986         case DCCPDIAG_GETSOCK:
 987                 return IPPROTO_DCCP;
 988         default:
 989                 return 0;
 990         }
 991 }
 992
 993 static int inet_diag_dump_compat(struct sk_buff *skb,
 994                                  struct netlink_callback *cb)
 995 {
 996         struct inet_diag_req *rc = nlmsg_data(cb->nlh);
 997         int hdrlen = sizeof(struct inet_diag_req);
 998         struct inet_diag_req_v2 req;
 999         struct nlattr *bc = NULL;
1000
1001         req.sdiag_family = AF_UNSPEC; /* compatibility */
1002         req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1003         req.idiag_ext = rc->idiag_ext;
1004         req.idiag_states = rc->idiag_states;
1005         req.id = rc->id;
1006
1007         if (nlmsg_attrlen(cb->nlh, hdrlen))
1008                 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1009
1010         return __inet_diag_dump(skb, cb, &req, bc);
1011 }
1012
1013 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1014                                       const struct nlmsghdr *nlh)
1015 {
1016         struct inet_diag_req *rc = nlmsg_data(nlh);
1017         struct inet_diag_req_v2 req;
1018
1019         req.sdiag_family = rc->idiag_family;
1020         req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1021         req.idiag_ext = rc->idiag_ext;
1022         req.idiag_states = rc->idiag_states;
1023         req.id = rc->id;
1024
1025         return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req);
1026 }
1027
1028 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1029 {
1030         int hdrlen = sizeof(struct inet_diag_req);
1031         struct net *net = sock_net(skb->sk);
1032
1033         if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1034             nlmsg_len(nlh) < hdrlen)
1035                 return -EINVAL;
1036
1037         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1038                 if (nlmsg_attrlen(nlh, hdrlen)) {
1039                         struct nlattr *attr;
1040                         int err;
1041
1042                         attr = nlmsg_find_attr(nlh, hdrlen,
1043                                                INET_DIAG_REQ_BYTECODE);
1044                         err = inet_diag_bc_audit(attr, skb);
1045                         if (err)
1046                                 return err;
1047                 }
1048                 {
1049                         struct netlink_dump_control c = {
1050                                 .dump = inet_diag_dump_compat,
1051                         };
1052                         return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1053                 }
1054         }
1055
1056         return inet_diag_get_exact_compat(skb, nlh);
1057 }
1058
1059 static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
1060 {
1061         int hdrlen = sizeof(struct inet_diag_req_v2);
1062         struct net *net = sock_net(skb->sk);
1063
1064         if (nlmsg_len(h) < hdrlen)
1065                 return -EINVAL;
1066
1067         if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1068             h->nlmsg_flags & NLM_F_DUMP) {
1069                 if (nlmsg_attrlen(h, hdrlen)) {
1070                         struct nlattr *attr;
1071                         int err;
1072
1073                         attr = nlmsg_find_attr(h, hdrlen,
1074                                                INET_DIAG_REQ_BYTECODE);
1075                         err = inet_diag_bc_audit(attr, skb);
1076                         if (err)
1077                                 return err;
1078                 }
1079                 {
1080                         struct netlink_dump_control c = {
1081                                 .dump = inet_diag_dump,
1082                         };
1083                         return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1084                 }
1085         }
1086
1087         return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h));
1088 }
1089
1090 static
1091 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1092 {
1093         const struct inet_diag_handler *handler;
1094         struct nlmsghdr *nlh;
1095         struct nlattr *attr;
1096         struct inet_diag_msg *r;
1097         void *info = NULL;
1098         int err = 0;
1099
1100         nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1101         if (!nlh)
1102                 return -ENOMEM;
1103
1104         r = nlmsg_data(nlh);
1105         memset(r, 0, sizeof(*r));
1106         inet_diag_msg_common_fill(r, sk);
1107         if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1108                 r->id.idiag_sport = inet_sk(sk)->inet_sport;
1109         r->idiag_state = sk->sk_state;
1110
1111         if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1112                 nlmsg_cancel(skb, nlh);
1113                 return err;
1114         }
1115
1116         handler = inet_diag_lock_handler(sk->sk_protocol);
1117         if (IS_ERR(handler)) {
1118                 inet_diag_unlock_handler(handler);
1119                 nlmsg_cancel(skb, nlh);
1120                 return PTR_ERR(handler);
1121         }
1122
1123         attr = handler->idiag_info_size
1124                 ? nla_reserve(skb, INET_DIAG_INFO, handler->idiag_info_size)
1125                 : NULL;
1126         if (attr)
1127                 info = nla_data(attr);
1128
1129         handler->idiag_get_info(sk, r, info);
1130         inet_diag_unlock_handler(handler);
1131
1132         nlmsg_end(skb, nlh);
1133         return 0;
1134 }
1135
1136 static const struct sock_diag_handler inet_diag_handler = {
1137         .family = AF_INET,
1138         .dump = inet_diag_handler_cmd,
1139         .get_info = inet_diag_handler_get_info,
1140         .destroy = inet_diag_handler_cmd,
1141 };
1142
1143 static const struct sock_diag_handler inet6_diag_handler = {
1144         .family = AF_INET6,
1145         .dump = inet_diag_handler_cmd,
1146         .get_info = inet_diag_handler_get_info,
1147         .destroy = inet_diag_handler_cmd,
1148 };
1149
1150 int inet_diag_register(const struct inet_diag_handler *h)
1151 {
1152         const __u16 type = h->idiag_type;
1153         int err = -EINVAL;
1154
1155         if (type >= IPPROTO_MAX)
1156                 goto out;
1157
1158         mutex_lock(&inet_diag_table_mutex);
1159         err = -EEXIST;
1160         if (!inet_diag_table[type]) {
1161                 inet_diag_table[type] = h;
1162                 err = 0;
1163         }
1164         mutex_unlock(&inet_diag_table_mutex);
1165 out:
1166         return err;
1167 }
1168 EXPORT_SYMBOL_GPL(inet_diag_register);
1169
1170 void inet_diag_unregister(const struct inet_diag_handler *h)
1171 {
1172         const __u16 type = h->idiag_type;
1173
1174         if (type >= IPPROTO_MAX)
1175                 return;
1176
1177         mutex_lock(&inet_diag_table_mutex);
1178         inet_diag_table[type] = NULL;
1179         mutex_unlock(&inet_diag_table_mutex);
1180 }
1181 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1182
1183 static int __init inet_diag_init(void)
1184 {
1185         const int inet_diag_table_size = (IPPROTO_MAX *
1186                                           sizeof(struct inet_diag_handler *));
1187         int err = -ENOMEM;
1188
1189         inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1190         if (!inet_diag_table)
1191                 goto out;
1192
1193         err = sock_diag_register(&inet_diag_handler);
1194         if (err)
1195                 goto out_free_nl;
1196
1197         err = sock_diag_register(&inet6_diag_handler);
1198         if (err)
1199                 goto out_free_inet;
1200
1201         sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1202 out:
1203         return err;
1204
1205 out_free_inet:
1206         sock_diag_unregister(&inet_diag_handler);
1207 out_free_nl:
1208         kfree(inet_diag_table);
1209         goto out;
1210 }
1211
1212 static void __exit inet_diag_exit(void)
1213 {
1214         sock_diag_unregister(&inet6_diag_handler);
1215         sock_diag_unregister(&inet_diag_handler);
1216         sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1217         kfree(inet_diag_table);
1218 }
1219
1220 module_init(inet_diag_init);
1221 module_exit(inet_diag_exit);
1222 MODULE_LICENSE("GPL");
1223 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1224 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);