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 };
  48
  49 static DEFINE_MUTEX(inet_diag_table_mutex);
  50
  51 static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
  52 {
  53         if (!inet_diag_table[proto])
  54                 request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
  55                                NETLINK_SOCK_DIAG, AF_INET, proto);
  56
  57         mutex_lock(&inet_diag_table_mutex);
  58         if (!inet_diag_table[proto])
  59                 return ERR_PTR(-ENOENT);
  60
  61         return inet_diag_table[proto];
  62 }
  63
  64 static inline void inet_diag_unlock_handler(
  65         const struct inet_diag_handler *handler)
  66 {
  67         mutex_unlock(&inet_diag_table_mutex);
  68 }
  69
  70 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
  71                               struct sk_buff *skb, struct inet_diag_req_v2 *req,
  72                               u32 pid, u32 seq, u16 nlmsg_flags,
  73                               const struct nlmsghdr *unlh)
  74 {
  75         const struct inet_sock *inet = inet_sk(sk);
  76         struct inet_diag_msg *r;
  77         struct nlmsghdr  *nlh;
  78         struct nlattr *attr;
  79         void *info = NULL;
  80         const struct inet_diag_handler *handler;
  81         int ext = req->idiag_ext;
  82
  83         handler = inet_diag_table[req->sdiag_protocol];
  84         BUG_ON(handler == NULL);
  85
  86         nlh = nlmsg_put(skb, pid, seq, unlh->nlmsg_type, sizeof(*r),
  87                         nlmsg_flags);
  88         if (!nlh)
  89                 return -EMSGSIZE;
  90
  91         r = nlmsg_data(nlh);
  92         BUG_ON(sk->sk_state == TCP_TIME_WAIT);
  93
  94         r->idiag_family = sk->sk_family;
  95         r->idiag_state = sk->sk_state;
  96         r->idiag_timer = 0;
  97         r->idiag_retrans = 0;
  98
  99         r->id.idiag_if = sk->sk_bound_dev_if;
 100         sock_diag_save_cookie(sk, r->id.idiag_cookie);
 101
 102         r->id.idiag_sport = inet->inet_sport;
 103         r->id.idiag_dport = inet->inet_dport;
 104         r->id.idiag_src[0] = inet->inet_rcv_saddr;
 105         r->id.idiag_dst[0] = inet->inet_daddr;
 106
 107         /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
 108          * hence this needs to be included regardless of socket family.
 109          */
 110         if (ext & (1 << (INET_DIAG_TOS - 1)))
 111                 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
 112                         goto errout;
 113
 114 #if IS_ENABLED(CONFIG_IPV6)
 115         if (r->idiag_family == AF_INET6) {
 116                 const struct ipv6_pinfo *np = inet6_sk(sk);
 117
 118                 *(struct in6_addr *)r->id.idiag_src = np->rcv_saddr;
 119                 *(struct in6_addr *)r->id.idiag_dst = np->daddr;
 120
 121                 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
 122                         if (nla_put_u8(skb, INET_DIAG_TCLASS, np->tclass) < 0)
 123                                 goto errout;
 124         }
 125 #endif
 126
 127         r->idiag_uid = sock_i_uid(sk);
 128         r->idiag_inode = sock_i_ino(sk);
 129
 130         if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
 131                 struct inet_diag_meminfo minfo = {
 132                         .idiag_rmem = sk_rmem_alloc_get(sk),
 133                         .idiag_wmem = sk->sk_wmem_queued,
 134                         .idiag_fmem = sk->sk_forward_alloc,
 135                         .idiag_tmem = sk_wmem_alloc_get(sk),
 136                 };
 137
 138                 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
 139                         goto errout;
 140         }
 141
 142         if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
 143                 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
 144                         goto errout;
 145
 146         if (icsk == NULL) {
 147                 handler->idiag_get_info(sk, r, NULL);
 148                 goto out;
 149         }
 150
 151 #define EXPIRES_IN_MS(tmo)  DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
 152
 153         if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
 154                 r->idiag_timer = 1;
 155                 r->idiag_retrans = icsk->icsk_retransmits;
 156                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
 157         } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
 158                 r->idiag_timer = 4;
 159                 r->idiag_retrans = icsk->icsk_probes_out;
 160                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
 161         } else if (timer_pending(&sk->sk_timer)) {
 162                 r->idiag_timer = 2;
 163                 r->idiag_retrans = icsk->icsk_probes_out;
 164                 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
 165         } else {
 166                 r->idiag_timer = 0;
 167                 r->idiag_expires = 0;
 168         }
 169 #undef EXPIRES_IN_MS
 170
 171         if (ext & (1 << (INET_DIAG_INFO - 1))) {
 172                 attr = nla_reserve(skb, INET_DIAG_INFO,
 173                                    sizeof(struct tcp_info));
 174                 if (!attr)
 175                         goto errout;
 176
 177                 info = nla_data(attr);
 178         }
 179
 180         if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops)
 181                 if (nla_put_string(skb, INET_DIAG_CONG,
 182                                    icsk->icsk_ca_ops->name) < 0)
 183                         goto errout;
 184
 185         handler->idiag_get_info(sk, r, info);
 186
 187         if (sk->sk_state < TCP_TIME_WAIT &&
 188             icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
 189                 icsk->icsk_ca_ops->get_info(sk, ext, skb);
 190
 191 out:
 192         return nlmsg_end(skb, nlh);
 193
 194 errout:
 195         nlmsg_cancel(skb, nlh);
 196         return -EMSGSIZE;
 197 }
 198 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
 199
 200 static int inet_csk_diag_fill(struct sock *sk,
 201                               struct sk_buff *skb, struct inet_diag_req_v2 *req,
 202                               u32 pid, u32 seq, u16 nlmsg_flags,
 203                               const struct nlmsghdr *unlh)
 204 {
 205         return inet_sk_diag_fill(sk, inet_csk(sk),
 206                         skb, req, pid, seq, nlmsg_flags, unlh);
 207 }
 208
 209 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
 210                                struct sk_buff *skb, struct inet_diag_req_v2 *req,
 211                                u32 pid, u32 seq, u16 nlmsg_flags,
 212                                const struct nlmsghdr *unlh)
 213 {
 214         long tmo;
 215         struct inet_diag_msg *r;
 216         struct nlmsghdr *nlh;
 217
 218         nlh = nlmsg_put(skb, pid, seq, unlh->nlmsg_type, sizeof(*r),
 219                         nlmsg_flags);
 220         if (!nlh)
 221                 return -EMSGSIZE;
 222
 223         r = nlmsg_data(nlh);
 224         BUG_ON(tw->tw_state != TCP_TIME_WAIT);
 225
 226         tmo = tw->tw_ttd - jiffies;
 227         if (tmo < 0)
 228                 tmo = 0;
 229
 230         r->idiag_family       = tw->tw_family;
 231         r->idiag_retrans      = 0;
 232         r->id.idiag_if        = tw->tw_bound_dev_if;
 233         sock_diag_save_cookie(tw, r->id.idiag_cookie);
 234         r->id.idiag_sport     = tw->tw_sport;
 235         r->id.idiag_dport     = tw->tw_dport;
 236         r->id.idiag_src[0]    = tw->tw_rcv_saddr;
 237         r->id.idiag_dst[0]    = tw->tw_daddr;
 238         r->idiag_state        = tw->tw_substate;
 239         r->idiag_timer        = 3;
 240         r->idiag_expires      = DIV_ROUND_UP(tmo * 1000, HZ);
 241         r->idiag_rqueue       = 0;
 242         r->idiag_wqueue       = 0;
 243         r->idiag_uid          = 0;
 244         r->idiag_inode        = 0;
 245 #if IS_ENABLED(CONFIG_IPV6)
 246         if (tw->tw_family == AF_INET6) {
 247                 const struct inet6_timewait_sock *tw6 =
 248                                                 inet6_twsk((struct sock *)tw);
 249
 250                 *(struct in6_addr *)r->id.idiag_src = tw6->tw_v6_rcv_saddr;
 251                 *(struct in6_addr *)r->id.idiag_dst = tw6->tw_v6_daddr;
 252         }
 253 #endif
 254
 255         return nlmsg_end(skb, nlh);
 256 }
 257
 258 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
 259                         struct inet_diag_req_v2 *r, u32 pid, u32 seq, u16 nlmsg_flags,
 260                         const struct nlmsghdr *unlh)
 261 {
 262         if (sk->sk_state == TCP_TIME_WAIT)
 263                 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
 264                                            skb, r, pid, seq, nlmsg_flags,
 265                                            unlh);
 266         return inet_csk_diag_fill(sk, skb, r, pid, seq, nlmsg_flags, unlh);
 267 }
 268
 269 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_skb,
 270                 const struct nlmsghdr *nlh, struct inet_diag_req_v2 *req)
 271 {
 272         int err;
 273         struct sock *sk;
 274         struct sk_buff *rep;
 275
 276         err = -EINVAL;
 277         if (req->sdiag_family == AF_INET) {
 278                 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0],
 279                                  req->id.idiag_dport, req->id.idiag_src[0],
 280                                  req->id.idiag_sport, req->id.idiag_if);
 281         }
 282 #if IS_ENABLED(CONFIG_IPV6)
 283         else if (req->sdiag_family == AF_INET6) {
 284                 sk = inet6_lookup(&init_net, hashinfo,
 285                                   (struct in6_addr *)req->id.idiag_dst,
 286                                   req->id.idiag_dport,
 287                                   (struct in6_addr *)req->id.idiag_src,
 288                                   req->id.idiag_sport,
 289                                   req->id.idiag_if);
 290         }
 291 #endif
 292         else {
 293                 goto out_nosk;
 294         }
 295
 296         err = -ENOENT;
 297         if (sk == NULL)
 298                 goto out_nosk;
 299
 300         err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
 301         if (err)
 302                 goto out;
 303
 304         rep = nlmsg_new(sizeof(struct inet_diag_msg) +
 305                         sizeof(struct inet_diag_meminfo) +
 306                         sizeof(struct tcp_info) + 64, GFP_KERNEL);
 307         if (!rep) {
 308                 err = -ENOMEM;
 309                 goto out;
 310         }
 311
 312         err = sk_diag_fill(sk, rep, req,
 313                            NETLINK_CB(in_skb).pid,
 314                            nlh->nlmsg_seq, 0, nlh);
 315         if (err < 0) {
 316                 WARN_ON(err == -EMSGSIZE);
 317                 nlmsg_free(rep);
 318                 goto out;
 319         }
 320         err = netlink_unicast(sock_diag_nlsk, rep, NETLINK_CB(in_skb).pid,
 321                               MSG_DONTWAIT);
 322         if (err > 0)
 323                 err = 0;
 324
 325 out:
 326         if (sk) {
 327                 if (sk->sk_state == TCP_TIME_WAIT)
 328                         inet_twsk_put((struct inet_timewait_sock *)sk);
 329                 else
 330                         sock_put(sk);
 331         }
 332 out_nosk:
 333         return err;
 334 }
 335 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
 336
 337 static int inet_diag_get_exact(struct sk_buff *in_skb,
 338                                const struct nlmsghdr *nlh,
 339                                struct inet_diag_req_v2 *req)
 340 {
 341         const struct inet_diag_handler *handler;
 342         int err;
 343
 344         handler = inet_diag_lock_handler(req->sdiag_protocol);
 345         if (IS_ERR(handler))
 346                 err = PTR_ERR(handler);
 347         else
 348                 err = handler->dump_one(in_skb, nlh, req);
 349         inet_diag_unlock_handler(handler);
 350
 351         return err;
 352 }
 353
 354 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
 355 {
 356         int words = bits >> 5;
 357
 358         bits &= 0x1f;
 359
 360         if (words) {
 361                 if (memcmp(a1, a2, words << 2))
 362                         return 0;
 363         }
 364         if (bits) {
 365                 __be32 w1, w2;
 366                 __be32 mask;
 367
 368                 w1 = a1[words];
 369                 w2 = a2[words];
 370
 371                 mask = htonl((0xffffffff) << (32 - bits));
 372
 373                 if ((w1 ^ w2) & mask)
 374                         return 0;
 375         }
 376
 377         return 1;
 378 }
 379
 380
 381 static int inet_diag_bc_run(const struct nlattr *_bc,
 382                 const struct inet_diag_entry *entry)
 383 {
 384         const void *bc = nla_data(_bc);
 385         int len = nla_len(_bc);
 386
 387         while (len > 0) {
 388                 int yes = 1;
 389                 const struct inet_diag_bc_op *op = bc;
 390
 391                 switch (op->code) {
 392                 case INET_DIAG_BC_NOP:
 393                         break;
 394                 case INET_DIAG_BC_JMP:
 395                         yes = 0;
 396                         break;
 397                 case INET_DIAG_BC_S_GE:
 398                         yes = entry->sport >= op[1].no;
 399                         break;
 400                 case INET_DIAG_BC_S_LE:
 401                         yes = entry->sport <= op[1].no;
 402                         break;
 403                 case INET_DIAG_BC_D_GE:
 404                         yes = entry->dport >= op[1].no;
 405                         break;
 406                 case INET_DIAG_BC_D_LE:
 407                         yes = entry->dport <= op[1].no;
 408                         break;
 409                 case INET_DIAG_BC_AUTO:
 410                         yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
 411                         break;
 412                 case INET_DIAG_BC_S_COND:
 413                 case INET_DIAG_BC_D_COND: {
 414                         struct inet_diag_hostcond *cond;
 415                         __be32 *addr;
 416
 417                         cond = (struct inet_diag_hostcond *)(op + 1);
 418                         if (cond->port != -1 &&
 419                             cond->port != (op->code == INET_DIAG_BC_S_COND ?
 420                                              entry->sport : entry->dport)) {
 421                                 yes = 0;
 422                                 break;
 423                         }
 424
 425                         if (cond->prefix_len == 0)
 426                                 break;
 427
 428                         if (op->code == INET_DIAG_BC_S_COND)
 429                                 addr = entry->saddr;
 430                         else
 431                                 addr = entry->daddr;
 432
 433                         if (bitstring_match(addr, cond->addr,
 434                                             cond->prefix_len))
 435                                 break;
 436                         if (entry->family == AF_INET6 &&
 437                             cond->family == AF_INET) {
 438                                 if (addr[0] == 0 && addr[1] == 0 &&
 439                                     addr[2] == htonl(0xffff) &&
 440                                     bitstring_match(addr + 3, cond->addr,
 441                                                     cond->prefix_len))
 442                                         break;
 443                         }
 444                         yes = 0;
 445                         break;
 446                 }
 447                 }
 448
 449                 if (yes) {
 450                         len -= op->yes;
 451                         bc += op->yes;
 452                 } else {
 453                         len -= op->no;
 454                         bc += op->no;
 455                 }
 456         }
 457         return len == 0;
 458 }
 459
 460 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
 461 {
 462         struct inet_diag_entry entry;
 463         struct inet_sock *inet = inet_sk(sk);
 464
 465         if (bc == NULL)
 466                 return 1;
 467
 468         entry.family = sk->sk_family;
 469 #if IS_ENABLED(CONFIG_IPV6)
 470         if (entry.family == AF_INET6) {
 471                 struct ipv6_pinfo *np = inet6_sk(sk);
 472
 473                 entry.saddr = np->rcv_saddr.s6_addr32;
 474                 entry.daddr = np->daddr.s6_addr32;
 475         } else
 476 #endif
 477         {
 478                 entry.saddr = &inet->inet_rcv_saddr;
 479                 entry.daddr = &inet->inet_daddr;
 480         }
 481         entry.sport = inet->inet_num;
 482         entry.dport = ntohs(inet->inet_dport);
 483         entry.userlocks = sk->sk_userlocks;
 484
 485         return inet_diag_bc_run(bc, &entry);
 486 }
 487 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
 488
 489 static int valid_cc(const void *bc, int len, int cc)
 490 {
 491         while (len >= 0) {
 492                 const struct inet_diag_bc_op *op = bc;
 493
 494                 if (cc > len)
 495                         return 0;
 496                 if (cc == len)
 497                         return 1;
 498                 if (op->yes < 4 || op->yes & 3)
 499                         return 0;
 500                 len -= op->yes;
 501                 bc  += op->yes;
 502         }
 503         return 0;
 504 }
 505
 506 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
 507 {
 508         const void *bc = bytecode;
 509         int  len = bytecode_len;
 510
 511         while (len > 0) {
 512                 const struct inet_diag_bc_op *op = bc;
 513
 514 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
 515                 switch (op->code) {
 516                 case INET_DIAG_BC_AUTO:
 517                 case INET_DIAG_BC_S_COND:
 518                 case INET_DIAG_BC_D_COND:
 519                 case INET_DIAG_BC_S_GE:
 520                 case INET_DIAG_BC_S_LE:
 521                 case INET_DIAG_BC_D_GE:
 522                 case INET_DIAG_BC_D_LE:
 523                 case INET_DIAG_BC_JMP:
 524                         if (op->no < 4 || op->no > len + 4 || op->no & 3)
 525                                 return -EINVAL;
 526                         if (op->no < len &&
 527                             !valid_cc(bytecode, bytecode_len, len - op->no))
 528                                 return -EINVAL;
 529                         break;
 530                 case INET_DIAG_BC_NOP:
 531                         break;
 532                 default:
 533                         return -EINVAL;
 534                 }
 535                 if (op->yes < 4 || op->yes > len + 4 || op->yes & 3)
 536                         return -EINVAL;
 537                 bc  += op->yes;
 538                 len -= op->yes;
 539         }
 540         return len == 0 ? 0 : -EINVAL;
 541 }
 542
 543 static int inet_csk_diag_dump(struct sock *sk,
 544                               struct sk_buff *skb,
 545                               struct netlink_callback *cb,
 546                               struct inet_diag_req_v2 *r,
 547                               const struct nlattr *bc)
 548 {
 549         if (!inet_diag_bc_sk(bc, sk))
 550                 return 0;
 551
 552         return inet_csk_diag_fill(sk, skb, r,
 553                                   NETLINK_CB(cb->skb).pid,
 554                                   cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
 555 }
 556
 557 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
 558                                struct sk_buff *skb,
 559                                struct netlink_callback *cb,
 560                                struct inet_diag_req_v2 *r,
 561                                const struct nlattr *bc)
 562 {
 563         if (bc != NULL) {
 564                 struct inet_diag_entry entry;
 565
 566                 entry.family = tw->tw_family;
 567 #if IS_ENABLED(CONFIG_IPV6)
 568                 if (tw->tw_family == AF_INET6) {
 569                         struct inet6_timewait_sock *tw6 =
 570                                                 inet6_twsk((struct sock *)tw);
 571                         entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
 572                         entry.daddr = tw6->tw_v6_daddr.s6_addr32;
 573                 } else
 574 #endif
 575                 {
 576                         entry.saddr = &tw->tw_rcv_saddr;
 577                         entry.daddr = &tw->tw_daddr;
 578                 }
 579                 entry.sport = tw->tw_num;
 580                 entry.dport = ntohs(tw->tw_dport);
 581                 entry.userlocks = 0;
 582
 583                 if (!inet_diag_bc_run(bc, &entry))
 584                         return 0;
 585         }
 586
 587         return inet_twsk_diag_fill(tw, skb, r,
 588                                    NETLINK_CB(cb->skb).pid,
 589                                    cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
 590 }
 591
 592 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
 593                               struct request_sock *req, u32 pid, u32 seq,
 594                               const struct nlmsghdr *unlh)
 595 {
 596         const struct inet_request_sock *ireq = inet_rsk(req);
 597         struct inet_sock *inet = inet_sk(sk);
 598         struct inet_diag_msg *r;
 599         struct nlmsghdr *nlh;
 600         long tmo;
 601
 602         nlh = nlmsg_put(skb, pid, seq, unlh->nlmsg_type, sizeof(*r),
 603                         NLM_F_MULTI);
 604         if (!nlh)
 605                 return -EMSGSIZE;
 606
 607         r = nlmsg_data(nlh);
 608         r->idiag_family = sk->sk_family;
 609         r->idiag_state = TCP_SYN_RECV;
 610         r->idiag_timer = 1;
 611         r->idiag_retrans = req->retrans;
 612
 613         r->id.idiag_if = sk->sk_bound_dev_if;
 614         sock_diag_save_cookie(req, r->id.idiag_cookie);
 615
 616         tmo = req->expires - jiffies;
 617         if (tmo < 0)
 618                 tmo = 0;
 619
 620         r->id.idiag_sport = inet->inet_sport;
 621         r->id.idiag_dport = ireq->rmt_port;
 622         r->id.idiag_src[0] = ireq->loc_addr;
 623         r->id.idiag_dst[0] = ireq->rmt_addr;
 624         r->idiag_expires = jiffies_to_msecs(tmo);
 625         r->idiag_rqueue = 0;
 626         r->idiag_wqueue = 0;
 627         r->idiag_uid = sock_i_uid(sk);
 628         r->idiag_inode = 0;
 629 #if IS_ENABLED(CONFIG_IPV6)
 630         if (r->idiag_family == AF_INET6) {
 631                 *(struct in6_addr *)r->id.idiag_src = inet6_rsk(req)->loc_addr;
 632                 *(struct in6_addr *)r->id.idiag_dst = inet6_rsk(req)->rmt_addr;
 633         }
 634 #endif
 635
 636         return nlmsg_end(skb, nlh);
 637 }
 638
 639 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
 640                                struct netlink_callback *cb,
 641                                struct inet_diag_req_v2 *r,
 642                                const struct nlattr *bc)
 643 {
 644         struct inet_diag_entry entry;
 645         struct inet_connection_sock *icsk = inet_csk(sk);
 646         struct listen_sock *lopt;
 647         struct inet_sock *inet = inet_sk(sk);
 648         int j, s_j;
 649         int reqnum, s_reqnum;
 650         int err = 0;
 651
 652         s_j = cb->args[3];
 653         s_reqnum = cb->args[4];
 654
 655         if (s_j > 0)
 656                 s_j--;
 657
 658         entry.family = sk->sk_family;
 659
 660         read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 661
 662         lopt = icsk->icsk_accept_queue.listen_opt;
 663         if (!lopt || !lopt->qlen)
 664                 goto out;
 665
 666         if (bc != NULL) {
 667                 entry.sport = inet->inet_num;
 668                 entry.userlocks = sk->sk_userlocks;
 669         }
 670
 671         for (j = s_j; j < lopt->nr_table_entries; j++) {
 672                 struct request_sock *req, *head = lopt->syn_table[j];
 673
 674                 reqnum = 0;
 675                 for (req = head; req; reqnum++, req = req->dl_next) {
 676                         struct inet_request_sock *ireq = inet_rsk(req);
 677
 678                         if (reqnum < s_reqnum)
 679                                 continue;
 680                         if (r->id.idiag_dport != ireq->rmt_port &&
 681                             r->id.idiag_dport)
 682                                 continue;
 683
 684                         if (bc) {
 685                                 entry.saddr =
 686 #if IS_ENABLED(CONFIG_IPV6)
 687                                         (entry.family == AF_INET6) ?
 688                                         inet6_rsk(req)->loc_addr.s6_addr32 :
 689 #endif
 690                                         &ireq->loc_addr;
 691                                 entry.daddr =
 692 #if IS_ENABLED(CONFIG_IPV6)
 693                                         (entry.family == AF_INET6) ?
 694                                         inet6_rsk(req)->rmt_addr.s6_addr32 :
 695 #endif
 696                                         &ireq->rmt_addr;
 697                                 entry.dport = ntohs(ireq->rmt_port);
 698
 699                                 if (!inet_diag_bc_run(bc, &entry))
 700                                         continue;
 701                         }
 702
 703                         err = inet_diag_fill_req(skb, sk, req,
 704                                                NETLINK_CB(cb->skb).pid,
 705                                                cb->nlh->nlmsg_seq, cb->nlh);
 706                         if (err < 0) {
 707                                 cb->args[3] = j + 1;
 708                                 cb->args[4] = reqnum;
 709                                 goto out;
 710                         }
 711                 }
 712
 713                 s_reqnum = 0;
 714         }
 715
 716 out:
 717         read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 718
 719         return err;
 720 }
 721
 722 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
 723                 struct netlink_callback *cb, struct inet_diag_req_v2 *r, struct nlattr *bc)
 724 {
 725         int i, num;
 726         int s_i, s_num;
 727
 728         s_i = cb->args[1];
 729         s_num = num = cb->args[2];
 730
 731         if (cb->args[0] == 0) {
 732                 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
 733                         goto skip_listen_ht;
 734
 735                 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
 736                         struct sock *sk;
 737                         struct hlist_nulls_node *node;
 738                         struct inet_listen_hashbucket *ilb;
 739
 740                         num = 0;
 741                         ilb = &hashinfo->listening_hash[i];
 742                         spin_lock_bh(&ilb->lock);
 743                         sk_nulls_for_each(sk, node, &ilb->head) {
 744                                 struct inet_sock *inet = inet_sk(sk);
 745
 746                                 if (num < s_num) {
 747                                         num++;
 748                                         continue;
 749                                 }
 750
 751                                 if (r->sdiag_family != AF_UNSPEC &&
 752                                                 sk->sk_family != r->sdiag_family)
 753                                         goto next_listen;
 754
 755                                 if (r->id.idiag_sport != inet->inet_sport &&
 756                                     r->id.idiag_sport)
 757                                         goto next_listen;
 758
 759                                 if (!(r->idiag_states & TCPF_LISTEN) ||
 760                                     r->id.idiag_dport ||
 761                                     cb->args[3] > 0)
 762                                         goto syn_recv;
 763
 764                                 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
 765                                         spin_unlock_bh(&ilb->lock);
 766                                         goto done;
 767                                 }
 768
 769 syn_recv:
 770                                 if (!(r->idiag_states & TCPF_SYN_RECV))
 771                                         goto next_listen;
 772
 773                                 if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) {
 774                                         spin_unlock_bh(&ilb->lock);
 775                                         goto done;
 776                                 }
 777
 778 next_listen:
 779                                 cb->args[3] = 0;
 780                                 cb->args[4] = 0;
 781                                 ++num;
 782                         }
 783                         spin_unlock_bh(&ilb->lock);
 784
 785                         s_num = 0;
 786                         cb->args[3] = 0;
 787                         cb->args[4] = 0;
 788                 }
 789 skip_listen_ht:
 790                 cb->args[0] = 1;
 791                 s_i = num = s_num = 0;
 792         }
 793
 794         if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
 795                 goto out;
 796
 797         for (i = s_i; i <= hashinfo->ehash_mask; i++) {
 798                 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
 799                 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
 800                 struct sock *sk;
 801                 struct hlist_nulls_node *node;
 802
 803                 num = 0;
 804
 805                 if (hlist_nulls_empty(&head->chain) &&
 806                         hlist_nulls_empty(&head->twchain))
 807                         continue;
 808
 809                 if (i > s_i)
 810                         s_num = 0;
 811
 812                 spin_lock_bh(lock);
 813                 sk_nulls_for_each(sk, node, &head->chain) {
 814                         struct inet_sock *inet = inet_sk(sk);
 815
 816                         if (num < s_num)
 817                                 goto next_normal;
 818                         if (!(r->idiag_states & (1 << sk->sk_state)))
 819                                 goto next_normal;
 820                         if (r->sdiag_family != AF_UNSPEC &&
 821                                         sk->sk_family != r->sdiag_family)
 822                                 goto next_normal;
 823                         if (r->id.idiag_sport != inet->inet_sport &&
 824                             r->id.idiag_sport)
 825                                 goto next_normal;
 826                         if (r->id.idiag_dport != inet->inet_dport &&
 827                             r->id.idiag_dport)
 828                                 goto next_normal;
 829                         if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
 830                                 spin_unlock_bh(lock);
 831                                 goto done;
 832                         }
 833 next_normal:
 834                         ++num;
 835                 }
 836
 837                 if (r->idiag_states & TCPF_TIME_WAIT) {
 838                         struct inet_timewait_sock *tw;
 839
 840                         inet_twsk_for_each(tw, node,
 841                                     &head->twchain) {
 842
 843                                 if (num < s_num)
 844                                         goto next_dying;
 845                                 if (r->sdiag_family != AF_UNSPEC &&
 846                                                 tw->tw_family != r->sdiag_family)
 847                                         goto next_dying;
 848                                 if (r->id.idiag_sport != tw->tw_sport &&
 849                                     r->id.idiag_sport)
 850                                         goto next_dying;
 851                                 if (r->id.idiag_dport != tw->tw_dport &&
 852                                     r->id.idiag_dport)
 853                                         goto next_dying;
 854                                 if (inet_twsk_diag_dump(tw, skb, cb, r, bc) < 0) {
 855                                         spin_unlock_bh(lock);
 856                                         goto done;
 857                                 }
 858 next_dying:
 859                                 ++num;
 860                         }
 861                 }
 862                 spin_unlock_bh(lock);
 863         }
 864
 865 done:
 866         cb->args[1] = i;
 867         cb->args[2] = num;
 868 out:
 869         ;
 870 }
 871 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
 872
 873 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
 874                 struct inet_diag_req_v2 *r, struct nlattr *bc)
 875 {
 876         const struct inet_diag_handler *handler;
 877
 878         handler = inet_diag_lock_handler(r->sdiag_protocol);
 879         if (!IS_ERR(handler))
 880                 handler->dump(skb, cb, r, bc);
 881         inet_diag_unlock_handler(handler);
 882
 883         return skb->len;
 884 }
 885
 886 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
 887 {
 888         struct nlattr *bc = NULL;
 889         int hdrlen = sizeof(struct inet_diag_req_v2);
 890
 891         if (nlmsg_attrlen(cb->nlh, hdrlen))
 892                 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
 893
 894         return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
 895 }
 896
 897 static inline int inet_diag_type2proto(int type)
 898 {
 899         switch (type) {
 900         case TCPDIAG_GETSOCK:
 901                 return IPPROTO_TCP;
 902         case DCCPDIAG_GETSOCK:
 903                 return IPPROTO_DCCP;
 904         default:
 905                 return 0;
 906         }
 907 }
 908
 909 static int inet_diag_dump_compat(struct sk_buff *skb, struct netlink_callback *cb)
 910 {
 911         struct inet_diag_req *rc = nlmsg_data(cb->nlh);
 912         struct inet_diag_req_v2 req;
 913         struct nlattr *bc = NULL;
 914         int hdrlen = sizeof(struct inet_diag_req);
 915
 916         req.sdiag_family = AF_UNSPEC; /* compatibility */
 917         req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
 918         req.idiag_ext = rc->idiag_ext;
 919         req.idiag_states = rc->idiag_states;
 920         req.id = rc->id;
 921
 922         if (nlmsg_attrlen(cb->nlh, hdrlen))
 923                 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
 924
 925         return __inet_diag_dump(skb, cb, &req, bc);
 926 }
 927
 928 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
 929                                const struct nlmsghdr *nlh)
 930 {
 931         struct inet_diag_req *rc = nlmsg_data(nlh);
 932         struct inet_diag_req_v2 req;
 933
 934         req.sdiag_family = rc->idiag_family;
 935         req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
 936         req.idiag_ext = rc->idiag_ext;
 937         req.idiag_states = rc->idiag_states;
 938         req.id = rc->id;
 939
 940         return inet_diag_get_exact(in_skb, nlh, &req);
 941 }
 942
 943 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
 944 {
 945         int hdrlen = sizeof(struct inet_diag_req);
 946
 947         if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
 948             nlmsg_len(nlh) < hdrlen)
 949                 return -EINVAL;
 950
 951         if (nlh->nlmsg_flags & NLM_F_DUMP) {
 952                 if (nlmsg_attrlen(nlh, hdrlen)) {
 953                         struct nlattr *attr;
 954
 955                         attr = nlmsg_find_attr(nlh, hdrlen,
 956                                                INET_DIAG_REQ_BYTECODE);
 957                         if (attr == NULL ||
 958                             nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
 959                             inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
 960                                 return -EINVAL;
 961                 }
 962                 {
 963                         struct netlink_dump_control c = {
 964                                 .dump = inet_diag_dump_compat,
 965                         };
 966                         return netlink_dump_start(sock_diag_nlsk, skb, nlh, &c);
 967                 }
 968         }
 969
 970         return inet_diag_get_exact_compat(skb, nlh);
 971 }
 972
 973 static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
 974 {
 975         int hdrlen = sizeof(struct inet_diag_req_v2);
 976
 977         if (nlmsg_len(h) < hdrlen)
 978                 return -EINVAL;
 979
 980         if (h->nlmsg_flags & NLM_F_DUMP) {
 981                 if (nlmsg_attrlen(h, hdrlen)) {
 982                         struct nlattr *attr;
 983                         attr = nlmsg_find_attr(h, hdrlen,
 984                                                INET_DIAG_REQ_BYTECODE);
 985                         if (attr == NULL ||
 986                             nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
 987                             inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
 988                                 return -EINVAL;
 989                 }
 990                 {
 991                         struct netlink_dump_control c = {
 992                                 .dump = inet_diag_dump,
 993                         };
 994                         return netlink_dump_start(sock_diag_nlsk, skb, h, &c);
 995                 }
 996         }
 997
 998         return inet_diag_get_exact(skb, h, nlmsg_data(h));
 999 }
1000
1001 static const struct sock_diag_handler inet_diag_handler = {
1002         .family = AF_INET,
1003         .dump = inet_diag_handler_dump,
1004 };
1005
1006 static const struct sock_diag_handler inet6_diag_handler = {
1007         .family = AF_INET6,
1008         .dump = inet_diag_handler_dump,
1009 };
1010
1011 int inet_diag_register(const struct inet_diag_handler *h)
1012 {
1013         const __u16 type = h->idiag_type;
1014         int err = -EINVAL;
1015
1016         if (type >= IPPROTO_MAX)
1017                 goto out;
1018
1019         mutex_lock(&inet_diag_table_mutex);
1020         err = -EEXIST;
1021         if (inet_diag_table[type] == NULL) {
1022                 inet_diag_table[type] = h;
1023                 err = 0;
1024         }
1025         mutex_unlock(&inet_diag_table_mutex);
1026 out:
1027         return err;
1028 }
1029 EXPORT_SYMBOL_GPL(inet_diag_register);
1030
1031 void inet_diag_unregister(const struct inet_diag_handler *h)
1032 {
1033         const __u16 type = h->idiag_type;
1034
1035         if (type >= IPPROTO_MAX)
1036                 return;
1037
1038         mutex_lock(&inet_diag_table_mutex);
1039         inet_diag_table[type] = NULL;
1040         mutex_unlock(&inet_diag_table_mutex);
1041 }
1042 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1043
1044 static int __init inet_diag_init(void)
1045 {
1046         const int inet_diag_table_size = (IPPROTO_MAX *
1047                                           sizeof(struct inet_diag_handler *));
1048         int err = -ENOMEM;
1049
1050         inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1051         if (!inet_diag_table)
1052                 goto out;
1053
1054         err = sock_diag_register(&inet_diag_handler);
1055         if (err)
1056                 goto out_free_nl;
1057
1058         err = sock_diag_register(&inet6_diag_handler);
1059         if (err)
1060                 goto out_free_inet;
1061
1062         sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1063 out:
1064         return err;
1065
1066 out_free_inet:
1067         sock_diag_unregister(&inet_diag_handler);
1068 out_free_nl:
1069         kfree(inet_diag_table);
1070         goto out;
1071 }
1072
1073 static void __exit inet_diag_exit(void)
1074 {
1075         sock_diag_unregister(&inet6_diag_handler);
1076         sock_diag_unregister(&inet_diag_handler);
1077         sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1078         kfree(inet_diag_table);
1079 }
1080
1081 module_init(inet_diag_init);
1082 module_exit(inet_diag_exit);
1083 MODULE_LICENSE("GPL");
1084 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1085 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);