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         __be32 *saddr;
  42         __be32 *daddr;
  43         u16 sport;
  44         u16 dport;
  45         u16 family;
  46         u16 userlocks;
  47 #if IS_ENABLED(CONFIG_IPV6)
  48         struct in6_addr saddr_storage;  /* for IPv4-mapped-IPv6 addresses */
  49         struct in6_addr daddr_storage;  /* for IPv4-mapped-IPv6 addresses */
  50 #endif
  51 };
  52
  53 static DEFINE_MUTEX(inet_diag_table_mutex);
  54
  55 static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
  56 {
  57         if (!inet_diag_table[proto])
  58                 request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
  59                                NETLINK_SOCK_DIAG, AF_INET, proto);
  60
  61         mutex_lock(&inet_diag_table_mutex);
  62         if (!inet_diag_table[proto])
  63                 return ERR_PTR(-ENOENT);
  64
  65         return inet_diag_table[proto];
  66 }
  67
  68 static inline void inet_diag_unlock_handler(
  69         const struct inet_diag_handler *handler)
  70 {
  71         mutex_unlock(&inet_diag_table_mutex);
  72 }
  73
  74 static size_t inet_sk_attr_size(void)
  75 {
  76         return    nla_total_size(sizeof(struct tcp_info))
  77                 + nla_total_size(1) /* INET_DIAG_SHUTDOWN */
  78                 + nla_total_size(1) /* INET_DIAG_TOS */
  79                 + nla_total_size(1) /* INET_DIAG_TCLASS */
  80                 + nla_total_size(sizeof(struct inet_diag_meminfo))
  81                 + nla_total_size(sizeof(struct inet_diag_msg))
  82                 + nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
  83                 + nla_total_size(TCP_CA_NAME_MAX)
  84                 + nla_total_size(sizeof(struct tcpvegas_info))
  85                 + 64;
  86 }
  87
  88 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
  89                               struct sk_buff *skb, struct inet_diag_req_v2 *req,
  90                               struct user_namespace *user_ns,
  91                               u32 portid, u32 seq, u16 nlmsg_flags,
  92                               const struct nlmsghdr *unlh)
  93 {
  94         const struct inet_sock *inet = inet_sk(sk);
  95         struct inet_diag_msg *r;
  96         struct nlmsghdr  *nlh;
  97         struct nlattr *attr;
  98         void *info = NULL;
  99         const struct inet_diag_handler *handler;
 100         int ext = req->idiag_ext;
 101
 102         handler = inet_diag_table[req->sdiag_protocol];
 103         BUG_ON(handler == NULL);
 104
 105         nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
 106                         nlmsg_flags);
 107         if (!nlh)
 108                 return -EMSGSIZE;
 109
 110         r = nlmsg_data(nlh);
 111         BUG_ON(sk->sk_state == TCP_TIME_WAIT);
 112
 113         r->idiag_family = sk->sk_family;
 114         r->idiag_state = sk->sk_state;
 115         r->idiag_timer = 0;
 116         r->idiag_retrans = 0;
 117
 118         r->id.idiag_if = sk->sk_bound_dev_if;
 119         sock_diag_save_cookie(sk, r->id.idiag_cookie);
 120
 121         r->id.idiag_sport = inet->inet_sport;
 122         r->id.idiag_dport = inet->inet_dport;
 123
 124         memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
 125         memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
 126
 127         r->id.idiag_src[0] = inet->inet_rcv_saddr;
 128         r->id.idiag_dst[0] = inet->inet_daddr;
 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
 143                 *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
 144                 *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
 145
 146                 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
 147                         if (nla_put_u8(skb, INET_DIAG_TCLASS,
 148                                        inet6_sk(sk)->tclass) < 0)
 149                                 goto errout;
 150         }
 151 #endif
 152
 153         r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
 154         r->idiag_inode = sock_i_ino(sk);
 155
 156         if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
 157                 struct inet_diag_meminfo minfo = {
 158                         .idiag_rmem = sk_rmem_alloc_get(sk),
 159                         .idiag_wmem = sk->sk_wmem_queued,
 160                         .idiag_fmem = sk->sk_forward_alloc,
 161                         .idiag_tmem = sk_wmem_alloc_get(sk),
 162                 };
 163
 164                 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
 165                         goto errout;
 166         }
 167
 168         if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
 169                 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
 170                         goto errout;
 171
 172         if (icsk == NULL) {
 173                 handler->idiag_get_info(sk, r, NULL);
 174                 goto out;
 175         }
 176
 177 #define EXPIRES_IN_MS(tmo)  DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
 178
 179         if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
 180             icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
 181             icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
 182                 r->idiag_timer = 1;
 183                 r->idiag_retrans = icsk->icsk_retransmits;
 184                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
 185         } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
 186                 r->idiag_timer = 4;
 187                 r->idiag_retrans = icsk->icsk_probes_out;
 188                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
 189         } else if (timer_pending(&sk->sk_timer)) {
 190                 r->idiag_timer = 2;
 191                 r->idiag_retrans = icsk->icsk_probes_out;
 192                 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
 193         } else {
 194                 r->idiag_timer = 0;
 195                 r->idiag_expires = 0;
 196         }
 197 #undef EXPIRES_IN_MS
 198
 199         if (ext & (1 << (INET_DIAG_INFO - 1))) {
 200                 attr = nla_reserve(skb, INET_DIAG_INFO,
 201                                    sizeof(struct tcp_info));
 202                 if (!attr)
 203                         goto errout;
 204
 205                 info = nla_data(attr);
 206         }
 207
 208         if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops)
 209                 if (nla_put_string(skb, INET_DIAG_CONG,
 210                                    icsk->icsk_ca_ops->name) < 0)
 211                         goto errout;
 212
 213         handler->idiag_get_info(sk, r, info);
 214
 215         if (sk->sk_state < TCP_TIME_WAIT &&
 216             icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
 217                 icsk->icsk_ca_ops->get_info(sk, ext, skb);
 218
 219 out:
 220         nlmsg_end(skb, nlh);
 221         return 0;
 222
 223 errout:
 224         nlmsg_cancel(skb, nlh);
 225         return -EMSGSIZE;
 226 }
 227 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
 228
 229 static int inet_csk_diag_fill(struct sock *sk,
 230                               struct sk_buff *skb, struct inet_diag_req_v2 *req,
 231                               struct user_namespace *user_ns,
 232                               u32 portid, u32 seq, u16 nlmsg_flags,
 233                               const struct nlmsghdr *unlh)
 234 {
 235         return inet_sk_diag_fill(sk, inet_csk(sk),
 236                         skb, req, user_ns, portid, seq, nlmsg_flags, unlh);
 237 }
 238
 239 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
 240                                struct sk_buff *skb, struct inet_diag_req_v2 *req,
 241                                u32 portid, u32 seq, u16 nlmsg_flags,
 242                                const struct nlmsghdr *unlh)
 243 {
 244         s32 tmo;
 245         struct inet_diag_msg *r;
 246         struct nlmsghdr *nlh;
 247
 248         nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
 249                         nlmsg_flags);
 250         if (!nlh)
 251                 return -EMSGSIZE;
 252
 253         r = nlmsg_data(nlh);
 254         BUG_ON(tw->tw_state != TCP_TIME_WAIT);
 255
 256         tmo = tw->tw_ttd - inet_tw_time_stamp();
 257         if (tmo < 0)
 258                 tmo = 0;
 259
 260         r->idiag_family       = tw->tw_family;
 261         r->idiag_retrans      = 0;
 262
 263         r->id.idiag_if        = tw->tw_bound_dev_if;
 264         sock_diag_save_cookie(tw, r->id.idiag_cookie);
 265
 266         r->id.idiag_sport     = tw->tw_sport;
 267         r->id.idiag_dport     = tw->tw_dport;
 268
 269         memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
 270         memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
 271
 272         r->id.idiag_src[0]    = tw->tw_rcv_saddr;
 273         r->id.idiag_dst[0]    = tw->tw_daddr;
 274
 275         r->idiag_state        = tw->tw_substate;
 276         r->idiag_timer        = 3;
 277         r->idiag_expires      = jiffies_to_msecs(tmo);
 278         r->idiag_rqueue       = 0;
 279         r->idiag_wqueue       = 0;
 280         r->idiag_uid          = 0;
 281         r->idiag_inode        = 0;
 282 #if IS_ENABLED(CONFIG_IPV6)
 283         if (tw->tw_family == AF_INET6) {
 284                 *(struct in6_addr *)r->id.idiag_src = tw->tw_v6_rcv_saddr;
 285                 *(struct in6_addr *)r->id.idiag_dst = tw->tw_v6_daddr;
 286         }
 287 #endif
 288
 289         nlmsg_end(skb, nlh);
 290         return 0;
 291 }
 292
 293 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
 294                         struct inet_diag_req_v2 *r,
 295                         struct user_namespace *user_ns,
 296                         u32 portid, u32 seq, u16 nlmsg_flags,
 297                         const struct nlmsghdr *unlh)
 298 {
 299         if (sk->sk_state == TCP_TIME_WAIT)
 300                 return inet_twsk_diag_fill(inet_twsk(sk), skb, r, portid, seq,
 301                                            nlmsg_flags, unlh);
 302
 303         return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
 304                                   nlmsg_flags, unlh);
 305 }
 306
 307 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_skb,
 308                 const struct nlmsghdr *nlh, struct inet_diag_req_v2 *req)
 309 {
 310         int err;
 311         struct sock *sk;
 312         struct sk_buff *rep;
 313         struct net *net = sock_net(in_skb->sk);
 314
 315         err = -EINVAL;
 316         if (req->sdiag_family == AF_INET) {
 317                 sk = inet_lookup(net, hashinfo, req->id.idiag_dst[0],
 318                                  req->id.idiag_dport, req->id.idiag_src[0],
 319                                  req->id.idiag_sport, req->id.idiag_if);
 320         }
 321 #if IS_ENABLED(CONFIG_IPV6)
 322         else if (req->sdiag_family == AF_INET6) {
 323                 sk = inet6_lookup(net, hashinfo,
 324                                   (struct in6_addr *)req->id.idiag_dst,
 325                                   req->id.idiag_dport,
 326                                   (struct in6_addr *)req->id.idiag_src,
 327                                   req->id.idiag_sport,
 328                                   req->id.idiag_if);
 329         }
 330 #endif
 331         else {
 332                 goto out_nosk;
 333         }
 334
 335         err = -ENOENT;
 336         if (sk == NULL)
 337                 goto out_nosk;
 338
 339         err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
 340         if (err)
 341                 goto out;
 342
 343         rep = nlmsg_new(inet_sk_attr_size(), GFP_KERNEL);
 344         if (!rep) {
 345                 err = -ENOMEM;
 346                 goto out;
 347         }
 348
 349         err = sk_diag_fill(sk, rep, req,
 350                            sk_user_ns(NETLINK_CB(in_skb).sk),
 351                            NETLINK_CB(in_skb).portid,
 352                            nlh->nlmsg_seq, 0, nlh);
 353         if (err < 0) {
 354                 WARN_ON(err == -EMSGSIZE);
 355                 nlmsg_free(rep);
 356                 goto out;
 357         }
 358         err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
 359                               MSG_DONTWAIT);
 360         if (err > 0)
 361                 err = 0;
 362
 363 out:
 364         if (sk)
 365                 sock_gen_put(sk);
 366
 367 out_nosk:
 368         return err;
 369 }
 370 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
 371
 372 static int inet_diag_get_exact(struct sk_buff *in_skb,
 373                                const struct nlmsghdr *nlh,
 374                                struct inet_diag_req_v2 *req)
 375 {
 376         const struct inet_diag_handler *handler;
 377         int err;
 378
 379         handler = inet_diag_lock_handler(req->sdiag_protocol);
 380         if (IS_ERR(handler))
 381                 err = PTR_ERR(handler);
 382         else
 383                 err = handler->dump_one(in_skb, nlh, req);
 384         inet_diag_unlock_handler(handler);
 385
 386         return err;
 387 }
 388
 389 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
 390 {
 391         int words = bits >> 5;
 392
 393         bits &= 0x1f;
 394
 395         if (words) {
 396                 if (memcmp(a1, a2, words << 2))
 397                         return 0;
 398         }
 399         if (bits) {
 400                 __be32 w1, w2;
 401                 __be32 mask;
 402
 403                 w1 = a1[words];
 404                 w2 = a2[words];
 405
 406                 mask = htonl((0xffffffff) << (32 - bits));
 407
 408                 if ((w1 ^ w2) & mask)
 409                         return 0;
 410         }
 411
 412         return 1;
 413 }
 414
 415
 416 static int inet_diag_bc_run(const struct nlattr *_bc,
 417                 const struct inet_diag_entry *entry)
 418 {
 419         const void *bc = nla_data(_bc);
 420         int len = nla_len(_bc);
 421
 422         while (len > 0) {
 423                 int yes = 1;
 424                 const struct inet_diag_bc_op *op = bc;
 425
 426                 switch (op->code) {
 427                 case INET_DIAG_BC_NOP:
 428                         break;
 429                 case INET_DIAG_BC_JMP:
 430                         yes = 0;
 431                         break;
 432                 case INET_DIAG_BC_S_GE:
 433                         yes = entry->sport >= op[1].no;
 434                         break;
 435                 case INET_DIAG_BC_S_LE:
 436                         yes = entry->sport <= op[1].no;
 437                         break;
 438                 case INET_DIAG_BC_D_GE:
 439                         yes = entry->dport >= op[1].no;
 440                         break;
 441                 case INET_DIAG_BC_D_LE:
 442                         yes = entry->dport <= op[1].no;
 443                         break;
 444                 case INET_DIAG_BC_AUTO:
 445                         yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
 446                         break;
 447                 case INET_DIAG_BC_S_COND:
 448                 case INET_DIAG_BC_D_COND: {
 449                         struct inet_diag_hostcond *cond;
 450                         __be32 *addr;
 451
 452                         cond = (struct inet_diag_hostcond *)(op + 1);
 453                         if (cond->port != -1 &&
 454                             cond->port != (op->code == INET_DIAG_BC_S_COND ?
 455                                              entry->sport : entry->dport)) {
 456                                 yes = 0;
 457                                 break;
 458                         }
 459
 460                         if (op->code == INET_DIAG_BC_S_COND)
 461                                 addr = entry->saddr;
 462                         else
 463                                 addr = entry->daddr;
 464
 465                         if (cond->family != AF_UNSPEC &&
 466                             cond->family != entry->family) {
 467                                 if (entry->family == AF_INET6 &&
 468                                     cond->family == AF_INET) {
 469                                         if (addr[0] == 0 && addr[1] == 0 &&
 470                                             addr[2] == htonl(0xffff) &&
 471                                             bitstring_match(addr + 3,
 472                                                             cond->addr,
 473                                                             cond->prefix_len))
 474                                                 break;
 475                                 }
 476                                 yes = 0;
 477                                 break;
 478                         }
 479
 480                         if (cond->prefix_len == 0)
 481                                 break;
 482                         if (bitstring_match(addr, cond->addr,
 483                                             cond->prefix_len))
 484                                 break;
 485                         yes = 0;
 486                         break;
 487                 }
 488                 }
 489
 490                 if (yes) {
 491                         len -= op->yes;
 492                         bc += op->yes;
 493                 } else {
 494                         len -= op->no;
 495                         bc += op->no;
 496                 }
 497         }
 498         return len == 0;
 499 }
 500
 501 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
 502 {
 503         struct inet_diag_entry entry;
 504         struct inet_sock *inet = inet_sk(sk);
 505
 506         if (bc == NULL)
 507                 return 1;
 508
 509         entry.family = sk->sk_family;
 510 #if IS_ENABLED(CONFIG_IPV6)
 511         if (entry.family == AF_INET6) {
 512
 513                 entry.saddr = sk->sk_v6_rcv_saddr.s6_addr32;
 514                 entry.daddr = sk->sk_v6_daddr.s6_addr32;
 515         } else
 516 #endif
 517         {
 518                 entry.saddr = &inet->inet_rcv_saddr;
 519                 entry.daddr = &inet->inet_daddr;
 520         }
 521         entry.sport = inet->inet_num;
 522         entry.dport = ntohs(inet->inet_dport);
 523         entry.userlocks = sk->sk_userlocks;
 524
 525         return inet_diag_bc_run(bc, &entry);
 526 }
 527 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
 528
 529 static int valid_cc(const void *bc, int len, int cc)
 530 {
 531         while (len >= 0) {
 532                 const struct inet_diag_bc_op *op = bc;
 533
 534                 if (cc > len)
 535                         return 0;
 536                 if (cc == len)
 537                         return 1;
 538                 if (op->yes < 4 || op->yes & 3)
 539                         return 0;
 540                 len -= op->yes;
 541                 bc  += op->yes;
 542         }
 543         return 0;
 544 }
 545
 546 /* Validate an inet_diag_hostcond. */
 547 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
 548                            int *min_len)
 549 {
 550         int addr_len;
 551         struct inet_diag_hostcond *cond;
 552
 553         /* Check hostcond space. */
 554         *min_len += sizeof(struct inet_diag_hostcond);
 555         if (len < *min_len)
 556                 return false;
 557         cond = (struct inet_diag_hostcond *)(op + 1);
 558
 559         /* Check address family and address length. */
 560         switch (cond->family) {
 561         case AF_UNSPEC:
 562                 addr_len = 0;
 563                 break;
 564         case AF_INET:
 565                 addr_len = sizeof(struct in_addr);
 566                 break;
 567         case AF_INET6:
 568                 addr_len = sizeof(struct in6_addr);
 569                 break;
 570         default:
 571                 return false;
 572         }
 573         *min_len += addr_len;
 574         if (len < *min_len)
 575                 return false;
 576
 577         /* Check prefix length (in bits) vs address length (in bytes). */
 578         if (cond->prefix_len > 8 * addr_len)
 579                 return false;
 580
 581         return true;
 582 }
 583
 584 /* Validate a port comparison operator. */
 585 static inline bool valid_port_comparison(const struct inet_diag_bc_op *op,
 586                                          int len, int *min_len)
 587 {
 588         /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
 589         *min_len += sizeof(struct inet_diag_bc_op);
 590         if (len < *min_len)
 591                 return false;
 592         return true;
 593 }
 594
 595 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
 596 {
 597         const void *bc = bytecode;
 598         int  len = bytecode_len;
 599
 600         while (len > 0) {
 601                 const struct inet_diag_bc_op *op = bc;
 602                 int min_len = sizeof(struct inet_diag_bc_op);
 603
 604 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
 605                 switch (op->code) {
 606                 case INET_DIAG_BC_S_COND:
 607                 case INET_DIAG_BC_D_COND:
 608                         if (!valid_hostcond(bc, len, &min_len))
 609                                 return -EINVAL;
 610                         break;
 611                 case INET_DIAG_BC_S_GE:
 612                 case INET_DIAG_BC_S_LE:
 613                 case INET_DIAG_BC_D_GE:
 614                 case INET_DIAG_BC_D_LE:
 615                         if (!valid_port_comparison(bc, len, &min_len))
 616                                 return -EINVAL;
 617                         break;
 618                 case INET_DIAG_BC_AUTO:
 619                 case INET_DIAG_BC_JMP:
 620                 case INET_DIAG_BC_NOP:
 621                         break;
 622                 default:
 623                         return -EINVAL;
 624                 }
 625
 626                 if (op->code != INET_DIAG_BC_NOP) {
 627                         if (op->no < min_len || op->no > len + 4 || op->no & 3)
 628                                 return -EINVAL;
 629                         if (op->no < len &&
 630                             !valid_cc(bytecode, bytecode_len, len - op->no))
 631                                 return -EINVAL;
 632                 }
 633
 634                 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
 635                         return -EINVAL;
 636                 bc  += op->yes;
 637                 len -= op->yes;
 638         }
 639         return len == 0 ? 0 : -EINVAL;
 640 }
 641
 642 static int inet_csk_diag_dump(struct sock *sk,
 643                               struct sk_buff *skb,
 644                               struct netlink_callback *cb,
 645                               struct inet_diag_req_v2 *r,
 646                               const struct nlattr *bc)
 647 {
 648         if (!inet_diag_bc_sk(bc, sk))
 649                 return 0;
 650
 651         return inet_csk_diag_fill(sk, skb, r,
 652                                   sk_user_ns(NETLINK_CB(cb->skb).sk),
 653                                   NETLINK_CB(cb->skb).portid,
 654                                   cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
 655 }
 656
 657 static int inet_twsk_diag_dump(struct sock *sk,
 658                                struct sk_buff *skb,
 659                                struct netlink_callback *cb,
 660                                struct inet_diag_req_v2 *r,
 661                                const struct nlattr *bc)
 662 {
 663         struct inet_timewait_sock *tw = inet_twsk(sk);
 664
 665         if (bc != NULL) {
 666                 struct inet_diag_entry entry;
 667
 668                 entry.family = tw->tw_family;
 669 #if IS_ENABLED(CONFIG_IPV6)
 670                 if (tw->tw_family == AF_INET6) {
 671                         entry.saddr = tw->tw_v6_rcv_saddr.s6_addr32;
 672                         entry.daddr = tw->tw_v6_daddr.s6_addr32;
 673                 } else
 674 #endif
 675                 {
 676                         entry.saddr = &tw->tw_rcv_saddr;
 677                         entry.daddr = &tw->tw_daddr;
 678                 }
 679                 entry.sport = tw->tw_num;
 680                 entry.dport = ntohs(tw->tw_dport);
 681                 entry.userlocks = 0;
 682
 683                 if (!inet_diag_bc_run(bc, &entry))
 684                         return 0;
 685         }
 686
 687         return inet_twsk_diag_fill(tw, skb, r,
 688                                    NETLINK_CB(cb->skb).portid,
 689                                    cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
 690 }
 691
 692 /* Get the IPv4, IPv6, or IPv4-mapped-IPv6 local and remote addresses
 693  * from a request_sock. For IPv4-mapped-IPv6 we must map IPv4 to IPv6.
 694  */
 695 static inline void inet_diag_req_addrs(const struct sock *sk,
 696                                        const struct request_sock *req,
 697                                        struct inet_diag_entry *entry)
 698 {
 699         struct inet_request_sock *ireq = inet_rsk(req);
 700
 701 #if IS_ENABLED(CONFIG_IPV6)
 702         if (sk->sk_family == AF_INET6) {
 703                 if (req->rsk_ops->family == AF_INET6) {
 704                         entry->saddr = ireq->ir_v6_loc_addr.s6_addr32;
 705                         entry->daddr = ireq->ir_v6_rmt_addr.s6_addr32;
 706                 } else if (req->rsk_ops->family == AF_INET) {
 707                         ipv6_addr_set_v4mapped(ireq->ir_loc_addr,
 708                                                &entry->saddr_storage);
 709                         ipv6_addr_set_v4mapped(ireq->ir_rmt_addr,
 710                                                &entry->daddr_storage);
 711                         entry->saddr = entry->saddr_storage.s6_addr32;
 712                         entry->daddr = entry->daddr_storage.s6_addr32;
 713                 }
 714         } else
 715 #endif
 716         {
 717                 entry->saddr = &ireq->ir_loc_addr;
 718                 entry->daddr = &ireq->ir_rmt_addr;
 719         }
 720 }
 721
 722 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
 723                               struct request_sock *req,
 724                               struct user_namespace *user_ns,
 725                               u32 portid, u32 seq,
 726                               const struct nlmsghdr *unlh)
 727 {
 728         const struct inet_request_sock *ireq = inet_rsk(req);
 729         struct inet_sock *inet = inet_sk(sk);
 730         struct inet_diag_msg *r;
 731         struct nlmsghdr *nlh;
 732         long tmo;
 733
 734         nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
 735                         NLM_F_MULTI);
 736         if (!nlh)
 737                 return -EMSGSIZE;
 738
 739         r = nlmsg_data(nlh);
 740         r->idiag_family = sk->sk_family;
 741         r->idiag_state = TCP_SYN_RECV;
 742         r->idiag_timer = 1;
 743         r->idiag_retrans = req->num_retrans;
 744
 745         r->id.idiag_if = sk->sk_bound_dev_if;
 746         sock_diag_save_cookie(req, r->id.idiag_cookie);
 747
 748         tmo = req->expires - jiffies;
 749         if (tmo < 0)
 750                 tmo = 0;
 751
 752         r->id.idiag_sport = inet->inet_sport;
 753         r->id.idiag_dport = ireq->ir_rmt_port;
 754
 755         memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
 756         memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
 757
 758         r->id.idiag_src[0] = ireq->ir_loc_addr;
 759         r->id.idiag_dst[0] = ireq->ir_rmt_addr;
 760
 761         r->idiag_expires = jiffies_to_msecs(tmo);
 762         r->idiag_rqueue = 0;
 763         r->idiag_wqueue = 0;
 764         r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
 765         r->idiag_inode = 0;
 766 #if IS_ENABLED(CONFIG_IPV6)
 767         if (r->idiag_family == AF_INET6) {
 768                 struct inet_diag_entry entry;
 769                 inet_diag_req_addrs(sk, req, &entry);
 770                 memcpy(r->id.idiag_src, entry.saddr, sizeof(struct in6_addr));
 771                 memcpy(r->id.idiag_dst, entry.daddr, sizeof(struct in6_addr));
 772         }
 773 #endif
 774
 775         nlmsg_end(skb, nlh);
 776         return 0;
 777 }
 778
 779 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
 780                                struct netlink_callback *cb,
 781                                struct inet_diag_req_v2 *r,
 782                                const struct nlattr *bc)
 783 {
 784         struct inet_diag_entry entry;
 785         struct inet_connection_sock *icsk = inet_csk(sk);
 786         struct listen_sock *lopt;
 787         struct inet_sock *inet = inet_sk(sk);
 788         int j, s_j;
 789         int reqnum, s_reqnum;
 790         int err = 0;
 791
 792         s_j = cb->args[3];
 793         s_reqnum = cb->args[4];
 794
 795         if (s_j > 0)
 796                 s_j--;
 797
 798         entry.family = sk->sk_family;
 799
 800         read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 801
 802         lopt = icsk->icsk_accept_queue.listen_opt;
 803         if (!lopt || !lopt->qlen)
 804                 goto out;
 805
 806         if (bc != NULL) {
 807                 entry.sport = inet->inet_num;
 808                 entry.userlocks = sk->sk_userlocks;
 809         }
 810
 811         for (j = s_j; j < lopt->nr_table_entries; j++) {
 812                 struct request_sock *req, *head = lopt->syn_table[j];
 813
 814                 reqnum = 0;
 815                 for (req = head; req; reqnum++, req = req->dl_next) {
 816                         struct inet_request_sock *ireq = inet_rsk(req);
 817
 818                         if (reqnum < s_reqnum)
 819                                 continue;
 820                         if (r->id.idiag_dport != ireq->ir_rmt_port &&
 821                             r->id.idiag_dport)
 822                                 continue;
 823
 824                         if (bc) {
 825                                 inet_diag_req_addrs(sk, req, &entry);
 826                                 entry.dport = ntohs(ireq->ir_rmt_port);
 827
 828                                 if (!inet_diag_bc_run(bc, &entry))
 829                                         continue;
 830                         }
 831
 832                         err = inet_diag_fill_req(skb, sk, req,
 833                                                sk_user_ns(NETLINK_CB(cb->skb).sk),
 834                                                NETLINK_CB(cb->skb).portid,
 835                                                cb->nlh->nlmsg_seq, cb->nlh);
 836                         if (err < 0) {
 837                                 cb->args[3] = j + 1;
 838                                 cb->args[4] = reqnum;
 839                                 goto out;
 840                         }
 841                 }
 842
 843                 s_reqnum = 0;
 844         }
 845
 846 out:
 847         read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 848
 849         return err;
 850 }
 851
 852 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
 853                 struct netlink_callback *cb, struct inet_diag_req_v2 *r, struct nlattr *bc)
 854 {
 855         int i, num;
 856         int s_i, s_num;
 857         struct net *net = sock_net(skb->sk);
 858
 859         s_i = cb->args[1];
 860         s_num = num = cb->args[2];
 861
 862         if (cb->args[0] == 0) {
 863                 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
 864                         goto skip_listen_ht;
 865
 866                 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
 867                         struct sock *sk;
 868                         struct hlist_nulls_node *node;
 869                         struct inet_listen_hashbucket *ilb;
 870
 871                         num = 0;
 872                         ilb = &hashinfo->listening_hash[i];
 873                         spin_lock_bh(&ilb->lock);
 874                         sk_nulls_for_each(sk, node, &ilb->head) {
 875                                 struct inet_sock *inet = inet_sk(sk);
 876
 877                                 if (!net_eq(sock_net(sk), net))
 878                                         continue;
 879
 880                                 if (num < s_num) {
 881                                         num++;
 882                                         continue;
 883                                 }
 884
 885                                 if (r->sdiag_family != AF_UNSPEC &&
 886                                                 sk->sk_family != r->sdiag_family)
 887                                         goto next_listen;
 888
 889                                 if (r->id.idiag_sport != inet->inet_sport &&
 890                                     r->id.idiag_sport)
 891                                         goto next_listen;
 892
 893                                 if (!(r->idiag_states & TCPF_LISTEN) ||
 894                                     r->id.idiag_dport ||
 895                                     cb->args[3] > 0)
 896                                         goto syn_recv;
 897
 898                                 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
 899                                         spin_unlock_bh(&ilb->lock);
 900                                         goto done;
 901                                 }
 902
 903 syn_recv:
 904                                 if (!(r->idiag_states & TCPF_SYN_RECV))
 905                                         goto next_listen;
 906
 907                                 if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) {
 908                                         spin_unlock_bh(&ilb->lock);
 909                                         goto done;
 910                                 }
 911
 912 next_listen:
 913                                 cb->args[3] = 0;
 914                                 cb->args[4] = 0;
 915                                 ++num;
 916                         }
 917                         spin_unlock_bh(&ilb->lock);
 918
 919                         s_num = 0;
 920                         cb->args[3] = 0;
 921                         cb->args[4] = 0;
 922                 }
 923 skip_listen_ht:
 924                 cb->args[0] = 1;
 925                 s_i = num = s_num = 0;
 926         }
 927
 928         if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
 929                 goto out;
 930
 931         for (i = s_i; i <= hashinfo->ehash_mask; i++) {
 932                 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
 933                 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
 934                 struct sock *sk;
 935                 struct hlist_nulls_node *node;
 936
 937                 num = 0;
 938
 939                 if (hlist_nulls_empty(&head->chain))
 940                         continue;
 941
 942                 if (i > s_i)
 943                         s_num = 0;
 944
 945                 spin_lock_bh(lock);
 946                 sk_nulls_for_each(sk, node, &head->chain) {
 947                         int res;
 948                         int state;
 949
 950                         if (!net_eq(sock_net(sk), net))
 951                                 continue;
 952                         if (num < s_num)
 953                                 goto next_normal;
 954                         state = (sk->sk_state == TCP_TIME_WAIT) ?
 955                                 inet_twsk(sk)->tw_substate : sk->sk_state;
 956                         if (!(r->idiag_states & (1 << state)))
 957                                 goto next_normal;
 958                         if (r->sdiag_family != AF_UNSPEC &&
 959                             sk->sk_family != r->sdiag_family)
 960                                 goto next_normal;
 961                         if (r->id.idiag_sport != htons(sk->sk_num) &&
 962                             r->id.idiag_sport)
 963                                 goto next_normal;
 964                         if (r->id.idiag_dport != sk->sk_dport &&
 965                             r->id.idiag_dport)
 966                                 goto next_normal;
 967                         if (sk->sk_state == TCP_TIME_WAIT)
 968                                 res = inet_twsk_diag_dump(sk, skb, cb, r, bc);
 969                         else
 970                                 res = inet_csk_diag_dump(sk, skb, cb, r, bc);
 971                         if (res < 0) {
 972                                 spin_unlock_bh(lock);
 973                                 goto done;
 974                         }
 975 next_normal:
 976                         ++num;
 977                 }
 978
 979                 spin_unlock_bh(lock);
 980         }
 981
 982 done:
 983         cb->args[1] = i;
 984         cb->args[2] = num;
 985 out:
 986         ;
 987 }
 988 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
 989
 990 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
 991                 struct inet_diag_req_v2 *r, struct nlattr *bc)
 992 {
 993         const struct inet_diag_handler *handler;
 994         int err = 0;
 995
 996         handler = inet_diag_lock_handler(r->sdiag_protocol);
 997         if (!IS_ERR(handler))
 998                 handler->dump(skb, cb, r, bc);
 999         else
1000                 err = PTR_ERR(handler);
1001         inet_diag_unlock_handler(handler);
1002
1003         return err ? : skb->len;
1004 }
1005
1006 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
1007 {
1008         struct nlattr *bc = NULL;
1009         int hdrlen = sizeof(struct inet_diag_req_v2);
1010
1011         if (nlmsg_attrlen(cb->nlh, hdrlen))
1012                 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1013
1014         return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
1015 }
1016
1017 static inline int inet_diag_type2proto(int type)
1018 {
1019         switch (type) {
1020         case TCPDIAG_GETSOCK:
1021                 return IPPROTO_TCP;
1022         case DCCPDIAG_GETSOCK:
1023                 return IPPROTO_DCCP;
1024         default:
1025                 return 0;
1026         }
1027 }
1028
1029 static int inet_diag_dump_compat(struct sk_buff *skb, struct netlink_callback *cb)
1030 {
1031         struct inet_diag_req *rc = nlmsg_data(cb->nlh);
1032         struct inet_diag_req_v2 req;
1033         struct nlattr *bc = NULL;
1034         int hdrlen = sizeof(struct inet_diag_req);
1035
1036         req.sdiag_family = AF_UNSPEC; /* compatibility */
1037         req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1038         req.idiag_ext = rc->idiag_ext;
1039         req.idiag_states = rc->idiag_states;
1040         req.id = rc->id;
1041
1042         if (nlmsg_attrlen(cb->nlh, hdrlen))
1043                 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1044
1045         return __inet_diag_dump(skb, cb, &req, bc);
1046 }
1047
1048 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1049                                const struct nlmsghdr *nlh)
1050 {
1051         struct inet_diag_req *rc = nlmsg_data(nlh);
1052         struct inet_diag_req_v2 req;
1053
1054         req.sdiag_family = rc->idiag_family;
1055         req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1056         req.idiag_ext = rc->idiag_ext;
1057         req.idiag_states = rc->idiag_states;
1058         req.id = rc->id;
1059
1060         return inet_diag_get_exact(in_skb, nlh, &req);
1061 }
1062
1063 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1064 {
1065         int hdrlen = sizeof(struct inet_diag_req);
1066         struct net *net = sock_net(skb->sk);
1067
1068         if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1069             nlmsg_len(nlh) < hdrlen)
1070                 return -EINVAL;
1071
1072         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1073                 if (nlmsg_attrlen(nlh, hdrlen)) {
1074                         struct nlattr *attr;
1075
1076                         attr = nlmsg_find_attr(nlh, hdrlen,
1077                                                INET_DIAG_REQ_BYTECODE);
1078                         if (attr == NULL ||
1079                             nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1080                             inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1081                                 return -EINVAL;
1082                 }
1083                 {
1084                         struct netlink_dump_control c = {
1085                                 .dump = inet_diag_dump_compat,
1086                         };
1087                         return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1088                 }
1089         }
1090
1091         return inet_diag_get_exact_compat(skb, nlh);
1092 }
1093
1094 static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
1095 {
1096         int hdrlen = sizeof(struct inet_diag_req_v2);
1097         struct net *net = sock_net(skb->sk);
1098
1099         if (nlmsg_len(h) < hdrlen)
1100                 return -EINVAL;
1101
1102         if (h->nlmsg_flags & NLM_F_DUMP) {
1103                 if (nlmsg_attrlen(h, hdrlen)) {
1104                         struct nlattr *attr;
1105                         attr = nlmsg_find_attr(h, hdrlen,
1106                                                INET_DIAG_REQ_BYTECODE);
1107                         if (attr == NULL ||
1108                             nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1109                             inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1110                                 return -EINVAL;
1111                 }
1112                 {
1113                         struct netlink_dump_control c = {
1114                                 .dump = inet_diag_dump,
1115                         };
1116                         return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1117                 }
1118         }
1119
1120         return inet_diag_get_exact(skb, h, nlmsg_data(h));
1121 }
1122
1123 static const struct sock_diag_handler inet_diag_handler = {
1124         .family = AF_INET,
1125         .dump = inet_diag_handler_dump,
1126 };
1127
1128 static const struct sock_diag_handler inet6_diag_handler = {
1129         .family = AF_INET6,
1130         .dump = inet_diag_handler_dump,
1131 };
1132
1133 int inet_diag_register(const struct inet_diag_handler *h)
1134 {
1135         const __u16 type = h->idiag_type;
1136         int err = -EINVAL;
1137
1138         if (type >= IPPROTO_MAX)
1139                 goto out;
1140
1141         mutex_lock(&inet_diag_table_mutex);
1142         err = -EEXIST;
1143         if (inet_diag_table[type] == NULL) {
1144                 inet_diag_table[type] = h;
1145                 err = 0;
1146         }
1147         mutex_unlock(&inet_diag_table_mutex);
1148 out:
1149         return err;
1150 }
1151 EXPORT_SYMBOL_GPL(inet_diag_register);
1152
1153 void inet_diag_unregister(const struct inet_diag_handler *h)
1154 {
1155         const __u16 type = h->idiag_type;
1156
1157         if (type >= IPPROTO_MAX)
1158                 return;
1159
1160         mutex_lock(&inet_diag_table_mutex);
1161         inet_diag_table[type] = NULL;
1162         mutex_unlock(&inet_diag_table_mutex);
1163 }
1164 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1165
1166 static int __init inet_diag_init(void)
1167 {
1168         const int inet_diag_table_size = (IPPROTO_MAX *
1169                                           sizeof(struct inet_diag_handler *));
1170         int err = -ENOMEM;
1171
1172         inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1173         if (!inet_diag_table)
1174                 goto out;
1175
1176         err = sock_diag_register(&inet_diag_handler);
1177         if (err)
1178                 goto out_free_nl;
1179
1180         err = sock_diag_register(&inet6_diag_handler);
1181         if (err)
1182                 goto out_free_inet;
1183
1184         sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1185 out:
1186         return err;
1187
1188 out_free_inet:
1189         sock_diag_unregister(&inet_diag_handler);
1190 out_free_nl:
1191         kfree(inet_diag_table);
1192         goto out;
1193 }
1194
1195 static void __exit inet_diag_exit(void)
1196 {
1197         sock_diag_unregister(&inet6_diag_handler);
1198         sock_diag_unregister(&inet_diag_handler);
1199         sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1200         kfree(inet_diag_table);
1201 }
1202
1203 module_init(inet_diag_init);
1204 module_exit(inet_diag_exit);
1205 MODULE_LICENSE("GPL");
1206 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1207 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);