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                               struct user_namespace *user_ns,
  73                               u32 portid, u32 seq, u16 nlmsg_flags,
  74                               const struct nlmsghdr *unlh)
  75 {
  76         const struct inet_sock *inet = inet_sk(sk);
  77         struct inet_diag_msg *r;
  78         struct nlmsghdr  *nlh;
  79         struct nlattr *attr;
  80         void *info = NULL;
  81         const struct inet_diag_handler *handler;
  82         int ext = req->idiag_ext;
  83
  84         handler = inet_diag_table[req->sdiag_protocol];
  85         BUG_ON(handler == NULL);
  86
  87         nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
  88                         nlmsg_flags);
  89         if (!nlh)
  90                 return -EMSGSIZE;
  91
  92         r = nlmsg_data(nlh);
  93         BUG_ON(sk->sk_state == TCP_TIME_WAIT);
  94
  95         r->idiag_family = sk->sk_family;
  96         r->idiag_state = sk->sk_state;
  97         r->idiag_timer = 0;
  98         r->idiag_retrans = 0;
  99
 100         r->id.idiag_if = sk->sk_bound_dev_if;
 101         sock_diag_save_cookie(sk, r->id.idiag_cookie);
 102
 103         r->id.idiag_sport = inet->inet_sport;
 104         r->id.idiag_dport = inet->inet_dport;
 105         r->id.idiag_src[0] = inet->inet_rcv_saddr;
 106         r->id.idiag_dst[0] = inet->inet_daddr;
 107
 108         /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
 109          * hence this needs to be included regardless of socket family.
 110          */
 111         if (ext & (1 << (INET_DIAG_TOS - 1)))
 112                 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
 113                         goto errout;
 114
 115 #if IS_ENABLED(CONFIG_IPV6)
 116         if (r->idiag_family == AF_INET6) {
 117                 const struct ipv6_pinfo *np = inet6_sk(sk);
 118
 119                 *(struct in6_addr *)r->id.idiag_src = np->rcv_saddr;
 120                 *(struct in6_addr *)r->id.idiag_dst = np->daddr;
 121
 122                 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
 123                         if (nla_put_u8(skb, INET_DIAG_TCLASS, np->tclass) < 0)
 124                                 goto errout;
 125         }
 126 #endif
 127
 128         r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
 129         r->idiag_inode = sock_i_ino(sk);
 130
 131         if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
 132                 struct inet_diag_meminfo minfo = {
 133                         .idiag_rmem = sk_rmem_alloc_get(sk),
 134                         .idiag_wmem = sk->sk_wmem_queued,
 135                         .idiag_fmem = sk->sk_forward_alloc,
 136                         .idiag_tmem = sk_wmem_alloc_get(sk),
 137                 };
 138
 139                 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
 140                         goto errout;
 141         }
 142
 143         if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
 144                 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
 145                         goto errout;
 146
 147         if (icsk == NULL) {
 148                 handler->idiag_get_info(sk, r, NULL);
 149                 goto out;
 150         }
 151
 152 #define EXPIRES_IN_MS(tmo)  DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
 153
 154         if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
 155                 r->idiag_timer = 1;
 156                 r->idiag_retrans = icsk->icsk_retransmits;
 157                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
 158         } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
 159                 r->idiag_timer = 4;
 160                 r->idiag_retrans = icsk->icsk_probes_out;
 161                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
 162         } else if (timer_pending(&sk->sk_timer)) {
 163                 r->idiag_timer = 2;
 164                 r->idiag_retrans = icsk->icsk_probes_out;
 165                 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
 166         } else {
 167                 r->idiag_timer = 0;
 168                 r->idiag_expires = 0;
 169         }
 170 #undef EXPIRES_IN_MS
 171
 172         if (ext & (1 << (INET_DIAG_INFO - 1))) {
 173                 attr = nla_reserve(skb, INET_DIAG_INFO,
 174                                    sizeof(struct tcp_info));
 175                 if (!attr)
 176                         goto errout;
 177
 178                 info = nla_data(attr);
 179         }
 180
 181         if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops)
 182                 if (nla_put_string(skb, INET_DIAG_CONG,
 183                                    icsk->icsk_ca_ops->name) < 0)
 184                         goto errout;
 185
 186         handler->idiag_get_info(sk, r, info);
 187
 188         if (sk->sk_state < TCP_TIME_WAIT &&
 189             icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
 190                 icsk->icsk_ca_ops->get_info(sk, ext, skb);
 191
 192 out:
 193         return nlmsg_end(skb, nlh);
 194
 195 errout:
 196         nlmsg_cancel(skb, nlh);
 197         return -EMSGSIZE;
 198 }
 199 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
 200
 201 static int inet_csk_diag_fill(struct sock *sk,
 202                               struct sk_buff *skb, struct inet_diag_req_v2 *req,
 203                               struct user_namespace *user_ns,
 204                               u32 portid, u32 seq, u16 nlmsg_flags,
 205                               const struct nlmsghdr *unlh)
 206 {
 207         return inet_sk_diag_fill(sk, inet_csk(sk),
 208                         skb, req, user_ns, portid, seq, nlmsg_flags, unlh);
 209 }
 210
 211 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
 212                                struct sk_buff *skb, struct inet_diag_req_v2 *req,
 213                                u32 portid, u32 seq, u16 nlmsg_flags,
 214                                const struct nlmsghdr *unlh)
 215 {
 216         long tmo;
 217         struct inet_diag_msg *r;
 218         struct nlmsghdr *nlh;
 219
 220         nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
 221                         nlmsg_flags);
 222         if (!nlh)
 223                 return -EMSGSIZE;
 224
 225         r = nlmsg_data(nlh);
 226         BUG_ON(tw->tw_state != TCP_TIME_WAIT);
 227
 228         tmo = tw->tw_ttd - jiffies;
 229         if (tmo < 0)
 230                 tmo = 0;
 231
 232         r->idiag_family       = tw->tw_family;
 233         r->idiag_retrans      = 0;
 234         r->id.idiag_if        = tw->tw_bound_dev_if;
 235         sock_diag_save_cookie(tw, r->id.idiag_cookie);
 236         r->id.idiag_sport     = tw->tw_sport;
 237         r->id.idiag_dport     = tw->tw_dport;
 238         r->id.idiag_src[0]    = tw->tw_rcv_saddr;
 239         r->id.idiag_dst[0]    = tw->tw_daddr;
 240         r->idiag_state        = tw->tw_substate;
 241         r->idiag_timer        = 3;
 242         r->idiag_expires      = DIV_ROUND_UP(tmo * 1000, HZ);
 243         r->idiag_rqueue       = 0;
 244         r->idiag_wqueue       = 0;
 245         r->idiag_uid          = 0;
 246         r->idiag_inode        = 0;
 247 #if IS_ENABLED(CONFIG_IPV6)
 248         if (tw->tw_family == AF_INET6) {
 249                 const struct inet6_timewait_sock *tw6 =
 250                                                 inet6_twsk((struct sock *)tw);
 251
 252                 *(struct in6_addr *)r->id.idiag_src = tw6->tw_v6_rcv_saddr;
 253                 *(struct in6_addr *)r->id.idiag_dst = tw6->tw_v6_daddr;
 254         }
 255 #endif
 256
 257         return nlmsg_end(skb, nlh);
 258 }
 259
 260 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
 261                         struct inet_diag_req_v2 *r,
 262                         struct user_namespace *user_ns,
 263                         u32 portid, u32 seq, u16 nlmsg_flags,
 264                         const struct nlmsghdr *unlh)
 265 {
 266         if (sk->sk_state == TCP_TIME_WAIT)
 267                 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
 268                                            skb, r, portid, seq, nlmsg_flags,
 269                                            unlh);
 270         return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq, nlmsg_flags, unlh);
 271 }
 272
 273 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_skb,
 274                 const struct nlmsghdr *nlh, struct inet_diag_req_v2 *req)
 275 {
 276         int err;
 277         struct sock *sk;
 278         struct sk_buff *rep;
 279         struct net *net = sock_net(in_skb->sk);
 280
 281         err = -EINVAL;
 282         if (req->sdiag_family == AF_INET) {
 283                 sk = inet_lookup(net, hashinfo, req->id.idiag_dst[0],
 284                                  req->id.idiag_dport, req->id.idiag_src[0],
 285                                  req->id.idiag_sport, req->id.idiag_if);
 286         }
 287 #if IS_ENABLED(CONFIG_IPV6)
 288         else if (req->sdiag_family == AF_INET6) {
 289                 sk = inet6_lookup(net, hashinfo,
 290                                   (struct in6_addr *)req->id.idiag_dst,
 291                                   req->id.idiag_dport,
 292                                   (struct in6_addr *)req->id.idiag_src,
 293                                   req->id.idiag_sport,
 294                                   req->id.idiag_if);
 295         }
 296 #endif
 297         else {
 298                 goto out_nosk;
 299         }
 300
 301         err = -ENOENT;
 302         if (sk == NULL)
 303                 goto out_nosk;
 304
 305         err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
 306         if (err)
 307                 goto out;
 308
 309         rep = nlmsg_new(sizeof(struct inet_diag_msg) +
 310                         sizeof(struct inet_diag_meminfo) +
 311                         sizeof(struct tcp_info) + 64, GFP_KERNEL);
 312         if (!rep) {
 313                 err = -ENOMEM;
 314                 goto out;
 315         }
 316
 317         err = sk_diag_fill(sk, rep, req,
 318                            sk_user_ns(NETLINK_CB(in_skb).ssk),
 319                            NETLINK_CB(in_skb).portid,
 320                            nlh->nlmsg_seq, 0, nlh);
 321         if (err < 0) {
 322                 WARN_ON(err == -EMSGSIZE);
 323                 nlmsg_free(rep);
 324                 goto out;
 325         }
 326         err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
 327                               MSG_DONTWAIT);
 328         if (err > 0)
 329                 err = 0;
 330
 331 out:
 332         if (sk) {
 333                 if (sk->sk_state == TCP_TIME_WAIT)
 334                         inet_twsk_put((struct inet_timewait_sock *)sk);
 335                 else
 336                         sock_put(sk);
 337         }
 338 out_nosk:
 339         return err;
 340 }
 341 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
 342
 343 static int inet_diag_get_exact(struct sk_buff *in_skb,
 344                                const struct nlmsghdr *nlh,
 345                                struct inet_diag_req_v2 *req)
 346 {
 347         const struct inet_diag_handler *handler;
 348         int err;
 349
 350         handler = inet_diag_lock_handler(req->sdiag_protocol);
 351         if (IS_ERR(handler))
 352                 err = PTR_ERR(handler);
 353         else
 354                 err = handler->dump_one(in_skb, nlh, req);
 355         inet_diag_unlock_handler(handler);
 356
 357         return err;
 358 }
 359
 360 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
 361 {
 362         int words = bits >> 5;
 363
 364         bits &= 0x1f;
 365
 366         if (words) {
 367                 if (memcmp(a1, a2, words << 2))
 368                         return 0;
 369         }
 370         if (bits) {
 371                 __be32 w1, w2;
 372                 __be32 mask;
 373
 374                 w1 = a1[words];
 375                 w2 = a2[words];
 376
 377                 mask = htonl((0xffffffff) << (32 - bits));
 378
 379                 if ((w1 ^ w2) & mask)
 380                         return 0;
 381         }
 382
 383         return 1;
 384 }
 385
 386
 387 static int inet_diag_bc_run(const struct nlattr *_bc,
 388                 const struct inet_diag_entry *entry)
 389 {
 390         const void *bc = nla_data(_bc);
 391         int len = nla_len(_bc);
 392
 393         while (len > 0) {
 394                 int yes = 1;
 395                 const struct inet_diag_bc_op *op = bc;
 396
 397                 switch (op->code) {
 398                 case INET_DIAG_BC_NOP:
 399                         break;
 400                 case INET_DIAG_BC_JMP:
 401                         yes = 0;
 402                         break;
 403                 case INET_DIAG_BC_S_GE:
 404                         yes = entry->sport >= op[1].no;
 405                         break;
 406                 case INET_DIAG_BC_S_LE:
 407                         yes = entry->sport <= op[1].no;
 408                         break;
 409                 case INET_DIAG_BC_D_GE:
 410                         yes = entry->dport >= op[1].no;
 411                         break;
 412                 case INET_DIAG_BC_D_LE:
 413                         yes = entry->dport <= op[1].no;
 414                         break;
 415                 case INET_DIAG_BC_AUTO:
 416                         yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
 417                         break;
 418                 case INET_DIAG_BC_S_COND:
 419                 case INET_DIAG_BC_D_COND: {
 420                         struct inet_diag_hostcond *cond;
 421                         __be32 *addr;
 422
 423                         cond = (struct inet_diag_hostcond *)(op + 1);
 424                         if (cond->port != -1 &&
 425                             cond->port != (op->code == INET_DIAG_BC_S_COND ?
 426                                              entry->sport : entry->dport)) {
 427                                 yes = 0;
 428                                 break;
 429                         }
 430
 431                         if (cond->prefix_len == 0)
 432                                 break;
 433
 434                         if (op->code == INET_DIAG_BC_S_COND)
 435                                 addr = entry->saddr;
 436                         else
 437                                 addr = entry->daddr;
 438
 439                         if (bitstring_match(addr, cond->addr,
 440                                             cond->prefix_len))
 441                                 break;
 442                         if (entry->family == AF_INET6 &&
 443                             cond->family == AF_INET) {
 444                                 if (addr[0] == 0 && addr[1] == 0 &&
 445                                     addr[2] == htonl(0xffff) &&
 446                                     bitstring_match(addr + 3, cond->addr,
 447                                                     cond->prefix_len))
 448                                         break;
 449                         }
 450                         yes = 0;
 451                         break;
 452                 }
 453                 }
 454
 455                 if (yes) {
 456                         len -= op->yes;
 457                         bc += op->yes;
 458                 } else {
 459                         len -= op->no;
 460                         bc += op->no;
 461                 }
 462         }
 463         return len == 0;
 464 }
 465
 466 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
 467 {
 468         struct inet_diag_entry entry;
 469         struct inet_sock *inet = inet_sk(sk);
 470
 471         if (bc == NULL)
 472                 return 1;
 473
 474         entry.family = sk->sk_family;
 475 #if IS_ENABLED(CONFIG_IPV6)
 476         if (entry.family == AF_INET6) {
 477                 struct ipv6_pinfo *np = inet6_sk(sk);
 478
 479                 entry.saddr = np->rcv_saddr.s6_addr32;
 480                 entry.daddr = np->daddr.s6_addr32;
 481         } else
 482 #endif
 483         {
 484                 entry.saddr = &inet->inet_rcv_saddr;
 485                 entry.daddr = &inet->inet_daddr;
 486         }
 487         entry.sport = inet->inet_num;
 488         entry.dport = ntohs(inet->inet_dport);
 489         entry.userlocks = sk->sk_userlocks;
 490
 491         return inet_diag_bc_run(bc, &entry);
 492 }
 493 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
 494
 495 static int valid_cc(const void *bc, int len, int cc)
 496 {
 497         while (len >= 0) {
 498                 const struct inet_diag_bc_op *op = bc;
 499
 500                 if (cc > len)
 501                         return 0;
 502                 if (cc == len)
 503                         return 1;
 504                 if (op->yes < 4 || op->yes & 3)
 505                         return 0;
 506                 len -= op->yes;
 507                 bc  += op->yes;
 508         }
 509         return 0;
 510 }
 511
 512 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
 513 {
 514         const void *bc = bytecode;
 515         int  len = bytecode_len;
 516
 517         while (len > 0) {
 518                 const struct inet_diag_bc_op *op = bc;
 519
 520 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
 521                 switch (op->code) {
 522                 case INET_DIAG_BC_AUTO:
 523                 case INET_DIAG_BC_S_COND:
 524                 case INET_DIAG_BC_D_COND:
 525                 case INET_DIAG_BC_S_GE:
 526                 case INET_DIAG_BC_S_LE:
 527                 case INET_DIAG_BC_D_GE:
 528                 case INET_DIAG_BC_D_LE:
 529                 case INET_DIAG_BC_JMP:
 530                         if (op->no < 4 || op->no > len + 4 || op->no & 3)
 531                                 return -EINVAL;
 532                         if (op->no < len &&
 533                             !valid_cc(bytecode, bytecode_len, len - op->no))
 534                                 return -EINVAL;
 535                         break;
 536                 case INET_DIAG_BC_NOP:
 537                         break;
 538                 default:
 539                         return -EINVAL;
 540                 }
 541                 if (op->yes < 4 || op->yes > len + 4 || op->yes & 3)
 542                         return -EINVAL;
 543                 bc  += op->yes;
 544                 len -= op->yes;
 545         }
 546         return len == 0 ? 0 : -EINVAL;
 547 }
 548
 549 static int inet_csk_diag_dump(struct sock *sk,
 550                               struct sk_buff *skb,
 551                               struct netlink_callback *cb,
 552                               struct inet_diag_req_v2 *r,
 553                               const struct nlattr *bc)
 554 {
 555         if (!inet_diag_bc_sk(bc, sk))
 556                 return 0;
 557
 558         return inet_csk_diag_fill(sk, skb, r,
 559                                   sk_user_ns(NETLINK_CB(cb->skb).ssk),
 560                                   NETLINK_CB(cb->skb).portid,
 561                                   cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
 562 }
 563
 564 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
 565                                struct sk_buff *skb,
 566                                struct netlink_callback *cb,
 567                                struct inet_diag_req_v2 *r,
 568                                const struct nlattr *bc)
 569 {
 570         if (bc != NULL) {
 571                 struct inet_diag_entry entry;
 572
 573                 entry.family = tw->tw_family;
 574 #if IS_ENABLED(CONFIG_IPV6)
 575                 if (tw->tw_family == AF_INET6) {
 576                         struct inet6_timewait_sock *tw6 =
 577                                                 inet6_twsk((struct sock *)tw);
 578                         entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
 579                         entry.daddr = tw6->tw_v6_daddr.s6_addr32;
 580                 } else
 581 #endif
 582                 {
 583                         entry.saddr = &tw->tw_rcv_saddr;
 584                         entry.daddr = &tw->tw_daddr;
 585                 }
 586                 entry.sport = tw->tw_num;
 587                 entry.dport = ntohs(tw->tw_dport);
 588                 entry.userlocks = 0;
 589
 590                 if (!inet_diag_bc_run(bc, &entry))
 591                         return 0;
 592         }
 593
 594         return inet_twsk_diag_fill(tw, skb, r,
 595                                    NETLINK_CB(cb->skb).portid,
 596                                    cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
 597 }
 598
 599 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
 600                               struct request_sock *req,
 601                               struct user_namespace *user_ns,
 602                               u32 portid, u32 seq,
 603                               const struct nlmsghdr *unlh)
 604 {
 605         const struct inet_request_sock *ireq = inet_rsk(req);
 606         struct inet_sock *inet = inet_sk(sk);
 607         struct inet_diag_msg *r;
 608         struct nlmsghdr *nlh;
 609         long tmo;
 610
 611         nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
 612                         NLM_F_MULTI);
 613         if (!nlh)
 614                 return -EMSGSIZE;
 615
 616         r = nlmsg_data(nlh);
 617         r->idiag_family = sk->sk_family;
 618         r->idiag_state = TCP_SYN_RECV;
 619         r->idiag_timer = 1;
 620         r->idiag_retrans = req->retrans;
 621
 622         r->id.idiag_if = sk->sk_bound_dev_if;
 623         sock_diag_save_cookie(req, r->id.idiag_cookie);
 624
 625         tmo = req->expires - jiffies;
 626         if (tmo < 0)
 627                 tmo = 0;
 628
 629         r->id.idiag_sport = inet->inet_sport;
 630         r->id.idiag_dport = ireq->rmt_port;
 631         r->id.idiag_src[0] = ireq->loc_addr;
 632         r->id.idiag_dst[0] = ireq->rmt_addr;
 633         r->idiag_expires = jiffies_to_msecs(tmo);
 634         r->idiag_rqueue = 0;
 635         r->idiag_wqueue = 0;
 636         r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
 637         r->idiag_inode = 0;
 638 #if IS_ENABLED(CONFIG_IPV6)
 639         if (r->idiag_family == AF_INET6) {
 640                 *(struct in6_addr *)r->id.idiag_src = inet6_rsk(req)->loc_addr;
 641                 *(struct in6_addr *)r->id.idiag_dst = inet6_rsk(req)->rmt_addr;
 642         }
 643 #endif
 644
 645         return nlmsg_end(skb, nlh);
 646 }
 647
 648 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
 649                                struct netlink_callback *cb,
 650                                struct inet_diag_req_v2 *r,
 651                                const struct nlattr *bc)
 652 {
 653         struct inet_diag_entry entry;
 654         struct inet_connection_sock *icsk = inet_csk(sk);
 655         struct listen_sock *lopt;
 656         struct inet_sock *inet = inet_sk(sk);
 657         int j, s_j;
 658         int reqnum, s_reqnum;
 659         int err = 0;
 660
 661         s_j = cb->args[3];
 662         s_reqnum = cb->args[4];
 663
 664         if (s_j > 0)
 665                 s_j--;
 666
 667         entry.family = sk->sk_family;
 668
 669         read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 670
 671         lopt = icsk->icsk_accept_queue.listen_opt;
 672         if (!lopt || !lopt->qlen)
 673                 goto out;
 674
 675         if (bc != NULL) {
 676                 entry.sport = inet->inet_num;
 677                 entry.userlocks = sk->sk_userlocks;
 678         }
 679
 680         for (j = s_j; j < lopt->nr_table_entries; j++) {
 681                 struct request_sock *req, *head = lopt->syn_table[j];
 682
 683                 reqnum = 0;
 684                 for (req = head; req; reqnum++, req = req->dl_next) {
 685                         struct inet_request_sock *ireq = inet_rsk(req);
 686
 687                         if (reqnum < s_reqnum)
 688                                 continue;
 689                         if (r->id.idiag_dport != ireq->rmt_port &&
 690                             r->id.idiag_dport)
 691                                 continue;
 692
 693                         if (bc) {
 694                                 entry.saddr =
 695 #if IS_ENABLED(CONFIG_IPV6)
 696                                         (entry.family == AF_INET6) ?
 697                                         inet6_rsk(req)->loc_addr.s6_addr32 :
 698 #endif
 699                                         &ireq->loc_addr;
 700                                 entry.daddr =
 701 #if IS_ENABLED(CONFIG_IPV6)
 702                                         (entry.family == AF_INET6) ?
 703                                         inet6_rsk(req)->rmt_addr.s6_addr32 :
 704 #endif
 705                                         &ireq->rmt_addr;
 706                                 entry.dport = ntohs(ireq->rmt_port);
 707
 708                                 if (!inet_diag_bc_run(bc, &entry))
 709                                         continue;
 710                         }
 711
 712                         err = inet_diag_fill_req(skb, sk, req,
 713                                                sk_user_ns(NETLINK_CB(cb->skb).ssk),
 714                                                NETLINK_CB(cb->skb).portid,
 715                                                cb->nlh->nlmsg_seq, cb->nlh);
 716                         if (err < 0) {
 717                                 cb->args[3] = j + 1;
 718                                 cb->args[4] = reqnum;
 719                                 goto out;
 720                         }
 721                 }
 722
 723                 s_reqnum = 0;
 724         }
 725
 726 out:
 727         read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 728
 729         return err;
 730 }
 731
 732 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
 733                 struct netlink_callback *cb, struct inet_diag_req_v2 *r, struct nlattr *bc)
 734 {
 735         int i, num;
 736         int s_i, s_num;
 737         struct net *net = sock_net(skb->sk);
 738
 739         s_i = cb->args[1];
 740         s_num = num = cb->args[2];
 741
 742         if (cb->args[0] == 0) {
 743                 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
 744                         goto skip_listen_ht;
 745
 746                 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
 747                         struct sock *sk;
 748                         struct hlist_nulls_node *node;
 749                         struct inet_listen_hashbucket *ilb;
 750
 751                         num = 0;
 752                         ilb = &hashinfo->listening_hash[i];
 753                         spin_lock_bh(&ilb->lock);
 754                         sk_nulls_for_each(sk, node, &ilb->head) {
 755                                 struct inet_sock *inet = inet_sk(sk);
 756
 757                                 if (!net_eq(sock_net(sk), net))
 758                                         continue;
 759
 760                                 if (num < s_num) {
 761                                         num++;
 762                                         continue;
 763                                 }
 764
 765                                 if (r->sdiag_family != AF_UNSPEC &&
 766                                                 sk->sk_family != r->sdiag_family)
 767                                         goto next_listen;
 768
 769                                 if (r->id.idiag_sport != inet->inet_sport &&
 770                                     r->id.idiag_sport)
 771                                         goto next_listen;
 772
 773                                 if (!(r->idiag_states & TCPF_LISTEN) ||
 774                                     r->id.idiag_dport ||
 775                                     cb->args[3] > 0)
 776                                         goto syn_recv;
 777
 778                                 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
 779                                         spin_unlock_bh(&ilb->lock);
 780                                         goto done;
 781                                 }
 782
 783 syn_recv:
 784                                 if (!(r->idiag_states & TCPF_SYN_RECV))
 785                                         goto next_listen;
 786
 787                                 if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) {
 788                                         spin_unlock_bh(&ilb->lock);
 789                                         goto done;
 790                                 }
 791
 792 next_listen:
 793                                 cb->args[3] = 0;
 794                                 cb->args[4] = 0;
 795                                 ++num;
 796                         }
 797                         spin_unlock_bh(&ilb->lock);
 798
 799                         s_num = 0;
 800                         cb->args[3] = 0;
 801                         cb->args[4] = 0;
 802                 }
 803 skip_listen_ht:
 804                 cb->args[0] = 1;
 805                 s_i = num = s_num = 0;
 806         }
 807
 808         if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
 809                 goto out;
 810
 811         for (i = s_i; i <= hashinfo->ehash_mask; i++) {
 812                 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
 813                 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
 814                 struct sock *sk;
 815                 struct hlist_nulls_node *node;
 816
 817                 num = 0;
 818
 819                 if (hlist_nulls_empty(&head->chain) &&
 820                         hlist_nulls_empty(&head->twchain))
 821                         continue;
 822
 823                 if (i > s_i)
 824                         s_num = 0;
 825
 826                 spin_lock_bh(lock);
 827                 sk_nulls_for_each(sk, node, &head->chain) {
 828                         struct inet_sock *inet = inet_sk(sk);
 829
 830                         if (!net_eq(sock_net(sk), net))
 831                                 continue;
 832                         if (num < s_num)
 833                                 goto next_normal;
 834                         if (!(r->idiag_states & (1 << sk->sk_state)))
 835                                 goto next_normal;
 836                         if (r->sdiag_family != AF_UNSPEC &&
 837                                         sk->sk_family != r->sdiag_family)
 838                                 goto next_normal;
 839                         if (r->id.idiag_sport != inet->inet_sport &&
 840                             r->id.idiag_sport)
 841                                 goto next_normal;
 842                         if (r->id.idiag_dport != inet->inet_dport &&
 843                             r->id.idiag_dport)
 844                                 goto next_normal;
 845                         if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
 846                                 spin_unlock_bh(lock);
 847                                 goto done;
 848                         }
 849 next_normal:
 850                         ++num;
 851                 }
 852
 853                 if (r->idiag_states & TCPF_TIME_WAIT) {
 854                         struct inet_timewait_sock *tw;
 855
 856                         inet_twsk_for_each(tw, node,
 857                                     &head->twchain) {
 858                                 if (!net_eq(twsk_net(tw), net))
 859                                         continue;
 860
 861                                 if (num < s_num)
 862                                         goto next_dying;
 863                                 if (r->sdiag_family != AF_UNSPEC &&
 864                                                 tw->tw_family != r->sdiag_family)
 865                                         goto next_dying;
 866                                 if (r->id.idiag_sport != tw->tw_sport &&
 867                                     r->id.idiag_sport)
 868                                         goto next_dying;
 869                                 if (r->id.idiag_dport != tw->tw_dport &&
 870                                     r->id.idiag_dport)
 871                                         goto next_dying;
 872                                 if (inet_twsk_diag_dump(tw, skb, cb, r, bc) < 0) {
 873                                         spin_unlock_bh(lock);
 874                                         goto done;
 875                                 }
 876 next_dying:
 877                                 ++num;
 878                         }
 879                 }
 880                 spin_unlock_bh(lock);
 881         }
 882
 883 done:
 884         cb->args[1] = i;
 885         cb->args[2] = num;
 886 out:
 887         ;
 888 }
 889 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
 890
 891 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
 892                 struct inet_diag_req_v2 *r, struct nlattr *bc)
 893 {
 894         const struct inet_diag_handler *handler;
 895         int err = 0;
 896
 897         handler = inet_diag_lock_handler(r->sdiag_protocol);
 898         if (!IS_ERR(handler))
 899                 handler->dump(skb, cb, r, bc);
 900         else
 901                 err = PTR_ERR(handler);
 902         inet_diag_unlock_handler(handler);
 903
 904         return err ? : skb->len;
 905 }
 906
 907 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
 908 {
 909         struct nlattr *bc = NULL;
 910         int hdrlen = sizeof(struct inet_diag_req_v2);
 911
 912         if (nlmsg_attrlen(cb->nlh, hdrlen))
 913                 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
 914
 915         return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
 916 }
 917
 918 static inline int inet_diag_type2proto(int type)
 919 {
 920         switch (type) {
 921         case TCPDIAG_GETSOCK:
 922                 return IPPROTO_TCP;
 923         case DCCPDIAG_GETSOCK:
 924                 return IPPROTO_DCCP;
 925         default:
 926                 return 0;
 927         }
 928 }
 929
 930 static int inet_diag_dump_compat(struct sk_buff *skb, struct netlink_callback *cb)
 931 {
 932         struct inet_diag_req *rc = nlmsg_data(cb->nlh);
 933         struct inet_diag_req_v2 req;
 934         struct nlattr *bc = NULL;
 935         int hdrlen = sizeof(struct inet_diag_req);
 936
 937         req.sdiag_family = AF_UNSPEC; /* compatibility */
 938         req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
 939         req.idiag_ext = rc->idiag_ext;
 940         req.idiag_states = rc->idiag_states;
 941         req.id = rc->id;
 942
 943         if (nlmsg_attrlen(cb->nlh, hdrlen))
 944                 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
 945
 946         return __inet_diag_dump(skb, cb, &req, bc);
 947 }
 948
 949 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
 950                                const struct nlmsghdr *nlh)
 951 {
 952         struct inet_diag_req *rc = nlmsg_data(nlh);
 953         struct inet_diag_req_v2 req;
 954
 955         req.sdiag_family = rc->idiag_family;
 956         req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
 957         req.idiag_ext = rc->idiag_ext;
 958         req.idiag_states = rc->idiag_states;
 959         req.id = rc->id;
 960
 961         return inet_diag_get_exact(in_skb, nlh, &req);
 962 }
 963
 964 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
 965 {
 966         int hdrlen = sizeof(struct inet_diag_req);
 967         struct net *net = sock_net(skb->sk);
 968
 969         if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
 970             nlmsg_len(nlh) < hdrlen)
 971                 return -EINVAL;
 972
 973         if (nlh->nlmsg_flags & NLM_F_DUMP) {
 974                 if (nlmsg_attrlen(nlh, hdrlen)) {
 975                         struct nlattr *attr;
 976
 977                         attr = nlmsg_find_attr(nlh, hdrlen,
 978                                                INET_DIAG_REQ_BYTECODE);
 979                         if (attr == NULL ||
 980                             nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
 981                             inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
 982                                 return -EINVAL;
 983                 }
 984                 {
 985                         struct netlink_dump_control c = {
 986                                 .dump = inet_diag_dump_compat,
 987                         };
 988                         return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
 989                 }
 990         }
 991
 992         return inet_diag_get_exact_compat(skb, nlh);
 993 }
 994
 995 static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
 996 {
 997         int hdrlen = sizeof(struct inet_diag_req_v2);
 998         struct net *net = sock_net(skb->sk);
 999
1000         if (nlmsg_len(h) < hdrlen)
1001                 return -EINVAL;
1002
1003         if (h->nlmsg_flags & NLM_F_DUMP) {
1004                 if (nlmsg_attrlen(h, hdrlen)) {
1005                         struct nlattr *attr;
1006                         attr = nlmsg_find_attr(h, hdrlen,
1007                                                INET_DIAG_REQ_BYTECODE);
1008                         if (attr == NULL ||
1009                             nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1010                             inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1011                                 return -EINVAL;
1012                 }
1013                 {
1014                         struct netlink_dump_control c = {
1015                                 .dump = inet_diag_dump,
1016                         };
1017                         return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1018                 }
1019         }
1020
1021         return inet_diag_get_exact(skb, h, nlmsg_data(h));
1022 }
1023
1024 static const struct sock_diag_handler inet_diag_handler = {
1025         .family = AF_INET,
1026         .dump = inet_diag_handler_dump,
1027 };
1028
1029 static const struct sock_diag_handler inet6_diag_handler = {
1030         .family = AF_INET6,
1031         .dump = inet_diag_handler_dump,
1032 };
1033
1034 int inet_diag_register(const struct inet_diag_handler *h)
1035 {
1036         const __u16 type = h->idiag_type;
1037         int err = -EINVAL;
1038
1039         if (type >= IPPROTO_MAX)
1040                 goto out;
1041
1042         mutex_lock(&inet_diag_table_mutex);
1043         err = -EEXIST;
1044         if (inet_diag_table[type] == NULL) {
1045                 inet_diag_table[type] = h;
1046                 err = 0;
1047         }
1048         mutex_unlock(&inet_diag_table_mutex);
1049 out:
1050         return err;
1051 }
1052 EXPORT_SYMBOL_GPL(inet_diag_register);
1053
1054 void inet_diag_unregister(const struct inet_diag_handler *h)
1055 {
1056         const __u16 type = h->idiag_type;
1057
1058         if (type >= IPPROTO_MAX)
1059                 return;
1060
1061         mutex_lock(&inet_diag_table_mutex);
1062         inet_diag_table[type] = NULL;
1063         mutex_unlock(&inet_diag_table_mutex);
1064 }
1065 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1066
1067 static int __init inet_diag_init(void)
1068 {
1069         const int inet_diag_table_size = (IPPROTO_MAX *
1070                                           sizeof(struct inet_diag_handler *));
1071         int err = -ENOMEM;
1072
1073         inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1074         if (!inet_diag_table)
1075                 goto out;
1076
1077         err = sock_diag_register(&inet_diag_handler);
1078         if (err)
1079                 goto out_free_nl;
1080
1081         err = sock_diag_register(&inet6_diag_handler);
1082         if (err)
1083                 goto out_free_inet;
1084
1085         sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1086 out:
1087         return err;
1088
1089 out_free_inet:
1090         sock_diag_unregister(&inet_diag_handler);
1091 out_free_nl:
1092         kfree(inet_diag_table);
1093         goto out;
1094 }
1095
1096 static void __exit inet_diag_exit(void)
1097 {
1098         sock_diag_unregister(&inet6_diag_handler);
1099         sock_diag_unregister(&inet_diag_handler);
1100         sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1101         kfree(inet_diag_table);
1102 }
1103
1104 module_init(inet_diag_init);
1105 module_exit(inet_diag_exit);
1106 MODULE_LICENSE("GPL");
1107 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1108 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);