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         struct net *net = sock_net(in_skb->sk);
 276
 277         err = -EINVAL;
 278         if (req->sdiag_family == AF_INET) {
 279                 sk = inet_lookup(net, hashinfo, req->id.idiag_dst[0],
 280                                  req->id.idiag_dport, req->id.idiag_src[0],
 281                                  req->id.idiag_sport, req->id.idiag_if);
 282         }
 283 #if IS_ENABLED(CONFIG_IPV6)
 284         else if (req->sdiag_family == AF_INET6) {
 285                 sk = inet6_lookup(net, hashinfo,
 286                                   (struct in6_addr *)req->id.idiag_dst,
 287                                   req->id.idiag_dport,
 288                                   (struct in6_addr *)req->id.idiag_src,
 289                                   req->id.idiag_sport,
 290                                   req->id.idiag_if);
 291         }
 292 #endif
 293         else {
 294                 goto out_nosk;
 295         }
 296
 297         err = -ENOENT;
 298         if (sk == NULL)
 299                 goto out_nosk;
 300
 301         err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
 302         if (err)
 303                 goto out;
 304
 305         rep = nlmsg_new(sizeof(struct inet_diag_msg) +
 306                         sizeof(struct inet_diag_meminfo) +
 307                         sizeof(struct tcp_info) + 64, GFP_KERNEL);
 308         if (!rep) {
 309                 err = -ENOMEM;
 310                 goto out;
 311         }
 312
 313         err = sk_diag_fill(sk, rep, req,
 314                            NETLINK_CB(in_skb).pid,
 315                            nlh->nlmsg_seq, 0, nlh);
 316         if (err < 0) {
 317                 WARN_ON(err == -EMSGSIZE);
 318                 nlmsg_free(rep);
 319                 goto out;
 320         }
 321         err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).pid,
 322                               MSG_DONTWAIT);
 323         if (err > 0)
 324                 err = 0;
 325
 326 out:
 327         if (sk) {
 328                 if (sk->sk_state == TCP_TIME_WAIT)
 329                         inet_twsk_put((struct inet_timewait_sock *)sk);
 330                 else
 331                         sock_put(sk);
 332         }
 333 out_nosk:
 334         return err;
 335 }
 336 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
 337
 338 static int inet_diag_get_exact(struct sk_buff *in_skb,
 339                                const struct nlmsghdr *nlh,
 340                                struct inet_diag_req_v2 *req)
 341 {
 342         const struct inet_diag_handler *handler;
 343         int err;
 344
 345         handler = inet_diag_lock_handler(req->sdiag_protocol);
 346         if (IS_ERR(handler))
 347                 err = PTR_ERR(handler);
 348         else
 349                 err = handler->dump_one(in_skb, nlh, req);
 350         inet_diag_unlock_handler(handler);
 351
 352         return err;
 353 }
 354
 355 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
 356 {
 357         int words = bits >> 5;
 358
 359         bits &= 0x1f;
 360
 361         if (words) {
 362                 if (memcmp(a1, a2, words << 2))
 363                         return 0;
 364         }
 365         if (bits) {
 366                 __be32 w1, w2;
 367                 __be32 mask;
 368
 369                 w1 = a1[words];
 370                 w2 = a2[words];
 371
 372                 mask = htonl((0xffffffff) << (32 - bits));
 373
 374                 if ((w1 ^ w2) & mask)
 375                         return 0;
 376         }
 377
 378         return 1;
 379 }
 380
 381
 382 static int inet_diag_bc_run(const struct nlattr *_bc,
 383                 const struct inet_diag_entry *entry)
 384 {
 385         const void *bc = nla_data(_bc);
 386         int len = nla_len(_bc);
 387
 388         while (len > 0) {
 389                 int yes = 1;
 390                 const struct inet_diag_bc_op *op = bc;
 391
 392                 switch (op->code) {
 393                 case INET_DIAG_BC_NOP:
 394                         break;
 395                 case INET_DIAG_BC_JMP:
 396                         yes = 0;
 397                         break;
 398                 case INET_DIAG_BC_S_GE:
 399                         yes = entry->sport >= op[1].no;
 400                         break;
 401                 case INET_DIAG_BC_S_LE:
 402                         yes = entry->sport <= op[1].no;
 403                         break;
 404                 case INET_DIAG_BC_D_GE:
 405                         yes = entry->dport >= op[1].no;
 406                         break;
 407                 case INET_DIAG_BC_D_LE:
 408                         yes = entry->dport <= op[1].no;
 409                         break;
 410                 case INET_DIAG_BC_AUTO:
 411                         yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
 412                         break;
 413                 case INET_DIAG_BC_S_COND:
 414                 case INET_DIAG_BC_D_COND: {
 415                         struct inet_diag_hostcond *cond;
 416                         __be32 *addr;
 417
 418                         cond = (struct inet_diag_hostcond *)(op + 1);
 419                         if (cond->port != -1 &&
 420                             cond->port != (op->code == INET_DIAG_BC_S_COND ?
 421                                              entry->sport : entry->dport)) {
 422                                 yes = 0;
 423                                 break;
 424                         }
 425
 426                         if (cond->prefix_len == 0)
 427                                 break;
 428
 429                         if (op->code == INET_DIAG_BC_S_COND)
 430                                 addr = entry->saddr;
 431                         else
 432                                 addr = entry->daddr;
 433
 434                         if (bitstring_match(addr, cond->addr,
 435                                             cond->prefix_len))
 436                                 break;
 437                         if (entry->family == AF_INET6 &&
 438                             cond->family == AF_INET) {
 439                                 if (addr[0] == 0 && addr[1] == 0 &&
 440                                     addr[2] == htonl(0xffff) &&
 441                                     bitstring_match(addr + 3, cond->addr,
 442                                                     cond->prefix_len))
 443                                         break;
 444                         }
 445                         yes = 0;
 446                         break;
 447                 }
 448                 }
 449
 450                 if (yes) {
 451                         len -= op->yes;
 452                         bc += op->yes;
 453                 } else {
 454                         len -= op->no;
 455                         bc += op->no;
 456                 }
 457         }
 458         return len == 0;
 459 }
 460
 461 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
 462 {
 463         struct inet_diag_entry entry;
 464         struct inet_sock *inet = inet_sk(sk);
 465
 466         if (bc == NULL)
 467                 return 1;
 468
 469         entry.family = sk->sk_family;
 470 #if IS_ENABLED(CONFIG_IPV6)
 471         if (entry.family == AF_INET6) {
 472                 struct ipv6_pinfo *np = inet6_sk(sk);
 473
 474                 entry.saddr = np->rcv_saddr.s6_addr32;
 475                 entry.daddr = np->daddr.s6_addr32;
 476         } else
 477 #endif
 478         {
 479                 entry.saddr = &inet->inet_rcv_saddr;
 480                 entry.daddr = &inet->inet_daddr;
 481         }
 482         entry.sport = inet->inet_num;
 483         entry.dport = ntohs(inet->inet_dport);
 484         entry.userlocks = sk->sk_userlocks;
 485
 486         return inet_diag_bc_run(bc, &entry);
 487 }
 488 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
 489
 490 static int valid_cc(const void *bc, int len, int cc)
 491 {
 492         while (len >= 0) {
 493                 const struct inet_diag_bc_op *op = bc;
 494
 495                 if (cc > len)
 496                         return 0;
 497                 if (cc == len)
 498                         return 1;
 499                 if (op->yes < 4 || op->yes & 3)
 500                         return 0;
 501                 len -= op->yes;
 502                 bc  += op->yes;
 503         }
 504         return 0;
 505 }
 506
 507 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
 508 {
 509         const void *bc = bytecode;
 510         int  len = bytecode_len;
 511
 512         while (len > 0) {
 513                 const struct inet_diag_bc_op *op = bc;
 514
 515 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
 516                 switch (op->code) {
 517                 case INET_DIAG_BC_AUTO:
 518                 case INET_DIAG_BC_S_COND:
 519                 case INET_DIAG_BC_D_COND:
 520                 case INET_DIAG_BC_S_GE:
 521                 case INET_DIAG_BC_S_LE:
 522                 case INET_DIAG_BC_D_GE:
 523                 case INET_DIAG_BC_D_LE:
 524                 case INET_DIAG_BC_JMP:
 525                         if (op->no < 4 || op->no > len + 4 || op->no & 3)
 526                                 return -EINVAL;
 527                         if (op->no < len &&
 528                             !valid_cc(bytecode, bytecode_len, len - op->no))
 529                                 return -EINVAL;
 530                         break;
 531                 case INET_DIAG_BC_NOP:
 532                         break;
 533                 default:
 534                         return -EINVAL;
 535                 }
 536                 if (op->yes < 4 || op->yes > len + 4 || op->yes & 3)
 537                         return -EINVAL;
 538                 bc  += op->yes;
 539                 len -= op->yes;
 540         }
 541         return len == 0 ? 0 : -EINVAL;
 542 }
 543
 544 static int inet_csk_diag_dump(struct sock *sk,
 545                               struct sk_buff *skb,
 546                               struct netlink_callback *cb,
 547                               struct inet_diag_req_v2 *r,
 548                               const struct nlattr *bc)
 549 {
 550         if (!inet_diag_bc_sk(bc, sk))
 551                 return 0;
 552
 553         return inet_csk_diag_fill(sk, skb, r,
 554                                   NETLINK_CB(cb->skb).pid,
 555                                   cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
 556 }
 557
 558 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
 559                                struct sk_buff *skb,
 560                                struct netlink_callback *cb,
 561                                struct inet_diag_req_v2 *r,
 562                                const struct nlattr *bc)
 563 {
 564         if (bc != NULL) {
 565                 struct inet_diag_entry entry;
 566
 567                 entry.family = tw->tw_family;
 568 #if IS_ENABLED(CONFIG_IPV6)
 569                 if (tw->tw_family == AF_INET6) {
 570                         struct inet6_timewait_sock *tw6 =
 571                                                 inet6_twsk((struct sock *)tw);
 572                         entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
 573                         entry.daddr = tw6->tw_v6_daddr.s6_addr32;
 574                 } else
 575 #endif
 576                 {
 577                         entry.saddr = &tw->tw_rcv_saddr;
 578                         entry.daddr = &tw->tw_daddr;
 579                 }
 580                 entry.sport = tw->tw_num;
 581                 entry.dport = ntohs(tw->tw_dport);
 582                 entry.userlocks = 0;
 583
 584                 if (!inet_diag_bc_run(bc, &entry))
 585                         return 0;
 586         }
 587
 588         return inet_twsk_diag_fill(tw, skb, r,
 589                                    NETLINK_CB(cb->skb).pid,
 590                                    cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
 591 }
 592
 593 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
 594                               struct request_sock *req, u32 pid, u32 seq,
 595                               const struct nlmsghdr *unlh)
 596 {
 597         const struct inet_request_sock *ireq = inet_rsk(req);
 598         struct inet_sock *inet = inet_sk(sk);
 599         struct inet_diag_msg *r;
 600         struct nlmsghdr *nlh;
 601         long tmo;
 602
 603         nlh = nlmsg_put(skb, pid, seq, unlh->nlmsg_type, sizeof(*r),
 604                         NLM_F_MULTI);
 605         if (!nlh)
 606                 return -EMSGSIZE;
 607
 608         r = nlmsg_data(nlh);
 609         r->idiag_family = sk->sk_family;
 610         r->idiag_state = TCP_SYN_RECV;
 611         r->idiag_timer = 1;
 612         r->idiag_retrans = req->retrans;
 613
 614         r->id.idiag_if = sk->sk_bound_dev_if;
 615         sock_diag_save_cookie(req, r->id.idiag_cookie);
 616
 617         tmo = req->expires - jiffies;
 618         if (tmo < 0)
 619                 tmo = 0;
 620
 621         r->id.idiag_sport = inet->inet_sport;
 622         r->id.idiag_dport = ireq->rmt_port;
 623         r->id.idiag_src[0] = ireq->loc_addr;
 624         r->id.idiag_dst[0] = ireq->rmt_addr;
 625         r->idiag_expires = jiffies_to_msecs(tmo);
 626         r->idiag_rqueue = 0;
 627         r->idiag_wqueue = 0;
 628         r->idiag_uid = sock_i_uid(sk);
 629         r->idiag_inode = 0;
 630 #if IS_ENABLED(CONFIG_IPV6)
 631         if (r->idiag_family == AF_INET6) {
 632                 *(struct in6_addr *)r->id.idiag_src = inet6_rsk(req)->loc_addr;
 633                 *(struct in6_addr *)r->id.idiag_dst = inet6_rsk(req)->rmt_addr;
 634         }
 635 #endif
 636
 637         return nlmsg_end(skb, nlh);
 638 }
 639
 640 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
 641                                struct netlink_callback *cb,
 642                                struct inet_diag_req_v2 *r,
 643                                const struct nlattr *bc)
 644 {
 645         struct inet_diag_entry entry;
 646         struct inet_connection_sock *icsk = inet_csk(sk);
 647         struct listen_sock *lopt;
 648         struct inet_sock *inet = inet_sk(sk);
 649         int j, s_j;
 650         int reqnum, s_reqnum;
 651         int err = 0;
 652
 653         s_j = cb->args[3];
 654         s_reqnum = cb->args[4];
 655
 656         if (s_j > 0)
 657                 s_j--;
 658
 659         entry.family = sk->sk_family;
 660
 661         read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 662
 663         lopt = icsk->icsk_accept_queue.listen_opt;
 664         if (!lopt || !lopt->qlen)
 665                 goto out;
 666
 667         if (bc != NULL) {
 668                 entry.sport = inet->inet_num;
 669                 entry.userlocks = sk->sk_userlocks;
 670         }
 671
 672         for (j = s_j; j < lopt->nr_table_entries; j++) {
 673                 struct request_sock *req, *head = lopt->syn_table[j];
 674
 675                 reqnum = 0;
 676                 for (req = head; req; reqnum++, req = req->dl_next) {
 677                         struct inet_request_sock *ireq = inet_rsk(req);
 678
 679                         if (reqnum < s_reqnum)
 680                                 continue;
 681                         if (r->id.idiag_dport != ireq->rmt_port &&
 682                             r->id.idiag_dport)
 683                                 continue;
 684
 685                         if (bc) {
 686                                 entry.saddr =
 687 #if IS_ENABLED(CONFIG_IPV6)
 688                                         (entry.family == AF_INET6) ?
 689                                         inet6_rsk(req)->loc_addr.s6_addr32 :
 690 #endif
 691                                         &ireq->loc_addr;
 692                                 entry.daddr =
 693 #if IS_ENABLED(CONFIG_IPV6)
 694                                         (entry.family == AF_INET6) ?
 695                                         inet6_rsk(req)->rmt_addr.s6_addr32 :
 696 #endif
 697                                         &ireq->rmt_addr;
 698                                 entry.dport = ntohs(ireq->rmt_port);
 699
 700                                 if (!inet_diag_bc_run(bc, &entry))
 701                                         continue;
 702                         }
 703
 704                         err = inet_diag_fill_req(skb, sk, req,
 705                                                NETLINK_CB(cb->skb).pid,
 706                                                cb->nlh->nlmsg_seq, cb->nlh);
 707                         if (err < 0) {
 708                                 cb->args[3] = j + 1;
 709                                 cb->args[4] = reqnum;
 710                                 goto out;
 711                         }
 712                 }
 713
 714                 s_reqnum = 0;
 715         }
 716
 717 out:
 718         read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 719
 720         return err;
 721 }
 722
 723 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
 724                 struct netlink_callback *cb, struct inet_diag_req_v2 *r, struct nlattr *bc)
 725 {
 726         int i, num;
 727         int s_i, s_num;
 728         struct net *net = sock_net(skb->sk);
 729
 730         s_i = cb->args[1];
 731         s_num = num = cb->args[2];
 732
 733         if (cb->args[0] == 0) {
 734                 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
 735                         goto skip_listen_ht;
 736
 737                 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
 738                         struct sock *sk;
 739                         struct hlist_nulls_node *node;
 740                         struct inet_listen_hashbucket *ilb;
 741
 742                         num = 0;
 743                         ilb = &hashinfo->listening_hash[i];
 744                         spin_lock_bh(&ilb->lock);
 745                         sk_nulls_for_each(sk, node, &ilb->head) {
 746                                 struct inet_sock *inet = inet_sk(sk);
 747
 748                                 if (!net_eq(sock_net(sk), net))
 749                                         continue;
 750
 751                                 if (num < s_num) {
 752                                         num++;
 753                                         continue;
 754                                 }
 755
 756                                 if (r->sdiag_family != AF_UNSPEC &&
 757                                                 sk->sk_family != r->sdiag_family)
 758                                         goto next_listen;
 759
 760                                 if (r->id.idiag_sport != inet->inet_sport &&
 761                                     r->id.idiag_sport)
 762                                         goto next_listen;
 763
 764                                 if (!(r->idiag_states & TCPF_LISTEN) ||
 765                                     r->id.idiag_dport ||
 766                                     cb->args[3] > 0)
 767                                         goto syn_recv;
 768
 769                                 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
 770                                         spin_unlock_bh(&ilb->lock);
 771                                         goto done;
 772                                 }
 773
 774 syn_recv:
 775                                 if (!(r->idiag_states & TCPF_SYN_RECV))
 776                                         goto next_listen;
 777
 778                                 if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) {
 779                                         spin_unlock_bh(&ilb->lock);
 780                                         goto done;
 781                                 }
 782
 783 next_listen:
 784                                 cb->args[3] = 0;
 785                                 cb->args[4] = 0;
 786                                 ++num;
 787                         }
 788                         spin_unlock_bh(&ilb->lock);
 789
 790                         s_num = 0;
 791                         cb->args[3] = 0;
 792                         cb->args[4] = 0;
 793                 }
 794 skip_listen_ht:
 795                 cb->args[0] = 1;
 796                 s_i = num = s_num = 0;
 797         }
 798
 799         if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
 800                 goto out;
 801
 802         for (i = s_i; i <= hashinfo->ehash_mask; i++) {
 803                 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
 804                 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
 805                 struct sock *sk;
 806                 struct hlist_nulls_node *node;
 807
 808                 num = 0;
 809
 810                 if (hlist_nulls_empty(&head->chain) &&
 811                         hlist_nulls_empty(&head->twchain))
 812                         continue;
 813
 814                 if (i > s_i)
 815                         s_num = 0;
 816
 817                 spin_lock_bh(lock);
 818                 sk_nulls_for_each(sk, node, &head->chain) {
 819                         struct inet_sock *inet = inet_sk(sk);
 820
 821                         if (!net_eq(sock_net(sk), net))
 822                                 continue;
 823                         if (num < s_num)
 824                                 goto next_normal;
 825                         if (!(r->idiag_states & (1 << sk->sk_state)))
 826                                 goto next_normal;
 827                         if (r->sdiag_family != AF_UNSPEC &&
 828                                         sk->sk_family != r->sdiag_family)
 829                                 goto next_normal;
 830                         if (r->id.idiag_sport != inet->inet_sport &&
 831                             r->id.idiag_sport)
 832                                 goto next_normal;
 833                         if (r->id.idiag_dport != inet->inet_dport &&
 834                             r->id.idiag_dport)
 835                                 goto next_normal;
 836                         if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
 837                                 spin_unlock_bh(lock);
 838                                 goto done;
 839                         }
 840 next_normal:
 841                         ++num;
 842                 }
 843
 844                 if (r->idiag_states & TCPF_TIME_WAIT) {
 845                         struct inet_timewait_sock *tw;
 846
 847                         inet_twsk_for_each(tw, node,
 848                                     &head->twchain) {
 849                                 if (!net_eq(twsk_net(tw), net))
 850                                         continue;
 851
 852                                 if (num < s_num)
 853                                         goto next_dying;
 854                                 if (r->sdiag_family != AF_UNSPEC &&
 855                                                 tw->tw_family != r->sdiag_family)
 856                                         goto next_dying;
 857                                 if (r->id.idiag_sport != tw->tw_sport &&
 858                                     r->id.idiag_sport)
 859                                         goto next_dying;
 860                                 if (r->id.idiag_dport != tw->tw_dport &&
 861                                     r->id.idiag_dport)
 862                                         goto next_dying;
 863                                 if (inet_twsk_diag_dump(tw, skb, cb, r, bc) < 0) {
 864                                         spin_unlock_bh(lock);
 865                                         goto done;
 866                                 }
 867 next_dying:
 868                                 ++num;
 869                         }
 870                 }
 871                 spin_unlock_bh(lock);
 872         }
 873
 874 done:
 875         cb->args[1] = i;
 876         cb->args[2] = num;
 877 out:
 878         ;
 879 }
 880 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
 881
 882 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
 883                 struct inet_diag_req_v2 *r, struct nlattr *bc)
 884 {
 885         const struct inet_diag_handler *handler;
 886
 887         handler = inet_diag_lock_handler(r->sdiag_protocol);
 888         if (!IS_ERR(handler))
 889                 handler->dump(skb, cb, r, bc);
 890         inet_diag_unlock_handler(handler);
 891
 892         return skb->len;
 893 }
 894
 895 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
 896 {
 897         struct nlattr *bc = NULL;
 898         int hdrlen = sizeof(struct inet_diag_req_v2);
 899
 900         if (nlmsg_attrlen(cb->nlh, hdrlen))
 901                 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
 902
 903         return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
 904 }
 905
 906 static inline int inet_diag_type2proto(int type)
 907 {
 908         switch (type) {
 909         case TCPDIAG_GETSOCK:
 910                 return IPPROTO_TCP;
 911         case DCCPDIAG_GETSOCK:
 912                 return IPPROTO_DCCP;
 913         default:
 914                 return 0;
 915         }
 916 }
 917
 918 static int inet_diag_dump_compat(struct sk_buff *skb, struct netlink_callback *cb)
 919 {
 920         struct inet_diag_req *rc = nlmsg_data(cb->nlh);
 921         struct inet_diag_req_v2 req;
 922         struct nlattr *bc = NULL;
 923         int hdrlen = sizeof(struct inet_diag_req);
 924
 925         req.sdiag_family = AF_UNSPEC; /* compatibility */
 926         req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
 927         req.idiag_ext = rc->idiag_ext;
 928         req.idiag_states = rc->idiag_states;
 929         req.id = rc->id;
 930
 931         if (nlmsg_attrlen(cb->nlh, hdrlen))
 932                 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
 933
 934         return __inet_diag_dump(skb, cb, &req, bc);
 935 }
 936
 937 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
 938                                const struct nlmsghdr *nlh)
 939 {
 940         struct inet_diag_req *rc = nlmsg_data(nlh);
 941         struct inet_diag_req_v2 req;
 942
 943         req.sdiag_family = rc->idiag_family;
 944         req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
 945         req.idiag_ext = rc->idiag_ext;
 946         req.idiag_states = rc->idiag_states;
 947         req.id = rc->id;
 948
 949         return inet_diag_get_exact(in_skb, nlh, &req);
 950 }
 951
 952 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
 953 {
 954         int hdrlen = sizeof(struct inet_diag_req);
 955         struct net *net = sock_net(skb->sk);
 956
 957         if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
 958             nlmsg_len(nlh) < hdrlen)
 959                 return -EINVAL;
 960
 961         if (nlh->nlmsg_flags & NLM_F_DUMP) {
 962                 if (nlmsg_attrlen(nlh, hdrlen)) {
 963                         struct nlattr *attr;
 964
 965                         attr = nlmsg_find_attr(nlh, hdrlen,
 966                                                INET_DIAG_REQ_BYTECODE);
 967                         if (attr == NULL ||
 968                             nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
 969                             inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
 970                                 return -EINVAL;
 971                 }
 972                 {
 973                         struct netlink_dump_control c = {
 974                                 .dump = inet_diag_dump_compat,
 975                         };
 976                         return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
 977                 }
 978         }
 979
 980         return inet_diag_get_exact_compat(skb, nlh);
 981 }
 982
 983 static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
 984 {
 985         int hdrlen = sizeof(struct inet_diag_req_v2);
 986         struct net *net = sock_net(skb->sk);
 987
 988         if (nlmsg_len(h) < hdrlen)
 989                 return -EINVAL;
 990
 991         if (h->nlmsg_flags & NLM_F_DUMP) {
 992                 if (nlmsg_attrlen(h, hdrlen)) {
 993                         struct nlattr *attr;
 994                         attr = nlmsg_find_attr(h, hdrlen,
 995                                                INET_DIAG_REQ_BYTECODE);
 996                         if (attr == NULL ||
 997                             nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
 998                             inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
 999                                 return -EINVAL;
1000                 }
1001                 {
1002                         struct netlink_dump_control c = {
1003                                 .dump = inet_diag_dump,
1004                         };
1005                         return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1006                 }
1007         }
1008
1009         return inet_diag_get_exact(skb, h, nlmsg_data(h));
1010 }
1011
1012 static const struct sock_diag_handler inet_diag_handler = {
1013         .family = AF_INET,
1014         .dump = inet_diag_handler_dump,
1015 };
1016
1017 static const struct sock_diag_handler inet6_diag_handler = {
1018         .family = AF_INET6,
1019         .dump = inet_diag_handler_dump,
1020 };
1021
1022 int inet_diag_register(const struct inet_diag_handler *h)
1023 {
1024         const __u16 type = h->idiag_type;
1025         int err = -EINVAL;
1026
1027         if (type >= IPPROTO_MAX)
1028                 goto out;
1029
1030         mutex_lock(&inet_diag_table_mutex);
1031         err = -EEXIST;
1032         if (inet_diag_table[type] == NULL) {
1033                 inet_diag_table[type] = h;
1034                 err = 0;
1035         }
1036         mutex_unlock(&inet_diag_table_mutex);
1037 out:
1038         return err;
1039 }
1040 EXPORT_SYMBOL_GPL(inet_diag_register);
1041
1042 void inet_diag_unregister(const struct inet_diag_handler *h)
1043 {
1044         const __u16 type = h->idiag_type;
1045
1046         if (type >= IPPROTO_MAX)
1047                 return;
1048
1049         mutex_lock(&inet_diag_table_mutex);
1050         inet_diag_table[type] = NULL;
1051         mutex_unlock(&inet_diag_table_mutex);
1052 }
1053 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1054
1055 static int __init inet_diag_init(void)
1056 {
1057         const int inet_diag_table_size = (IPPROTO_MAX *
1058                                           sizeof(struct inet_diag_handler *));
1059         int err = -ENOMEM;
1060
1061         inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1062         if (!inet_diag_table)
1063                 goto out;
1064
1065         err = sock_diag_register(&inet_diag_handler);
1066         if (err)
1067                 goto out_free_nl;
1068
1069         err = sock_diag_register(&inet6_diag_handler);
1070         if (err)
1071                 goto out_free_inet;
1072
1073         sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1074 out:
1075         return err;
1076
1077 out_free_inet:
1078         sock_diag_unregister(&inet_diag_handler);
1079 out_free_nl:
1080         kfree(inet_diag_table);
1081         goto out;
1082 }
1083
1084 static void __exit inet_diag_exit(void)
1085 {
1086         sock_diag_unregister(&inet6_diag_handler);
1087         sock_diag_unregister(&inet_diag_handler);
1088         sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1089         kfree(inet_diag_table);
1090 }
1091
1092 module_init(inet_diag_init);
1093 module_exit(inet_diag_exit);
1094 MODULE_LICENSE("GPL");
1095 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1096 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);