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         if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
 109                 goto errout;
 110
 111         /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
 112          * hence this needs to be included regardless of socket family.
 113          */
 114         if (ext & (1 << (INET_DIAG_TOS - 1)))
 115                 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
 116                         goto errout;
 117
 118 #if IS_ENABLED(CONFIG_IPV6)
 119         if (r->idiag_family == AF_INET6) {
 120                 const struct ipv6_pinfo *np = inet6_sk(sk);
 121
 122                 *(struct in6_addr *)r->id.idiag_src = np->rcv_saddr;
 123                 *(struct in6_addr *)r->id.idiag_dst = np->daddr;
 124
 125                 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
 126                         if (nla_put_u8(skb, INET_DIAG_TCLASS, np->tclass) < 0)
 127                                 goto errout;
 128         }
 129 #endif
 130
 131         r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
 132         r->idiag_inode = sock_i_ino(sk);
 133
 134         if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
 135                 struct inet_diag_meminfo minfo = {
 136                         .idiag_rmem = sk_rmem_alloc_get(sk),
 137                         .idiag_wmem = sk->sk_wmem_queued,
 138                         .idiag_fmem = sk->sk_forward_alloc,
 139                         .idiag_tmem = sk_wmem_alloc_get(sk),
 140                 };
 141
 142                 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
 143                         goto errout;
 144         }
 145
 146         if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
 147                 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
 148                         goto errout;
 149
 150         if (icsk == NULL) {
 151                 handler->idiag_get_info(sk, r, NULL);
 152                 goto out;
 153         }
 154
 155 #define EXPIRES_IN_MS(tmo)  DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
 156
 157         if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
 158                 r->idiag_timer = 1;
 159                 r->idiag_retrans = icsk->icsk_retransmits;
 160                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
 161         } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
 162                 r->idiag_timer = 4;
 163                 r->idiag_retrans = icsk->icsk_probes_out;
 164                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
 165         } else if (timer_pending(&sk->sk_timer)) {
 166                 r->idiag_timer = 2;
 167                 r->idiag_retrans = icsk->icsk_probes_out;
 168                 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
 169         } else {
 170                 r->idiag_timer = 0;
 171                 r->idiag_expires = 0;
 172         }
 173 #undef EXPIRES_IN_MS
 174
 175         if (ext & (1 << (INET_DIAG_INFO - 1))) {
 176                 attr = nla_reserve(skb, INET_DIAG_INFO,
 177                                    sizeof(struct tcp_info));
 178                 if (!attr)
 179                         goto errout;
 180
 181                 info = nla_data(attr);
 182         }
 183
 184         if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops)
 185                 if (nla_put_string(skb, INET_DIAG_CONG,
 186                                    icsk->icsk_ca_ops->name) < 0)
 187                         goto errout;
 188
 189         handler->idiag_get_info(sk, r, info);
 190
 191         if (sk->sk_state < TCP_TIME_WAIT &&
 192             icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
 193                 icsk->icsk_ca_ops->get_info(sk, ext, skb);
 194
 195 out:
 196         return nlmsg_end(skb, nlh);
 197
 198 errout:
 199         nlmsg_cancel(skb, nlh);
 200         return -EMSGSIZE;
 201 }
 202 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
 203
 204 static int inet_csk_diag_fill(struct sock *sk,
 205                               struct sk_buff *skb, struct inet_diag_req_v2 *req,
 206                               struct user_namespace *user_ns,
 207                               u32 portid, u32 seq, u16 nlmsg_flags,
 208                               const struct nlmsghdr *unlh)
 209 {
 210         return inet_sk_diag_fill(sk, inet_csk(sk),
 211                         skb, req, user_ns, portid, seq, nlmsg_flags, unlh);
 212 }
 213
 214 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
 215                                struct sk_buff *skb, struct inet_diag_req_v2 *req,
 216                                u32 portid, u32 seq, u16 nlmsg_flags,
 217                                const struct nlmsghdr *unlh)
 218 {
 219         long tmo;
 220         struct inet_diag_msg *r;
 221         struct nlmsghdr *nlh;
 222
 223         nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
 224                         nlmsg_flags);
 225         if (!nlh)
 226                 return -EMSGSIZE;
 227
 228         r = nlmsg_data(nlh);
 229         BUG_ON(tw->tw_state != TCP_TIME_WAIT);
 230
 231         tmo = tw->tw_ttd - jiffies;
 232         if (tmo < 0)
 233                 tmo = 0;
 234
 235         r->idiag_family       = tw->tw_family;
 236         r->idiag_retrans      = 0;
 237         r->id.idiag_if        = tw->tw_bound_dev_if;
 238         sock_diag_save_cookie(tw, r->id.idiag_cookie);
 239         r->id.idiag_sport     = tw->tw_sport;
 240         r->id.idiag_dport     = tw->tw_dport;
 241         r->id.idiag_src[0]    = tw->tw_rcv_saddr;
 242         r->id.idiag_dst[0]    = tw->tw_daddr;
 243         r->idiag_state        = tw->tw_substate;
 244         r->idiag_timer        = 3;
 245         r->idiag_expires      = DIV_ROUND_UP(tmo * 1000, HZ);
 246         r->idiag_rqueue       = 0;
 247         r->idiag_wqueue       = 0;
 248         r->idiag_uid          = 0;
 249         r->idiag_inode        = 0;
 250 #if IS_ENABLED(CONFIG_IPV6)
 251         if (tw->tw_family == AF_INET6) {
 252                 const struct inet6_timewait_sock *tw6 =
 253                                                 inet6_twsk((struct sock *)tw);
 254
 255                 *(struct in6_addr *)r->id.idiag_src = tw6->tw_v6_rcv_saddr;
 256                 *(struct in6_addr *)r->id.idiag_dst = tw6->tw_v6_daddr;
 257         }
 258 #endif
 259
 260         return nlmsg_end(skb, nlh);
 261 }
 262
 263 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
 264                         struct inet_diag_req_v2 *r,
 265                         struct user_namespace *user_ns,
 266                         u32 portid, u32 seq, u16 nlmsg_flags,
 267                         const struct nlmsghdr *unlh)
 268 {
 269         if (sk->sk_state == TCP_TIME_WAIT)
 270                 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
 271                                            skb, r, portid, seq, nlmsg_flags,
 272                                            unlh);
 273         return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq, nlmsg_flags, unlh);
 274 }
 275
 276 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_skb,
 277                 const struct nlmsghdr *nlh, struct inet_diag_req_v2 *req)
 278 {
 279         int err;
 280         struct sock *sk;
 281         struct sk_buff *rep;
 282         struct net *net = sock_net(in_skb->sk);
 283
 284         err = -EINVAL;
 285         if (req->sdiag_family == AF_INET) {
 286                 sk = inet_lookup(net, hashinfo, req->id.idiag_dst[0],
 287                                  req->id.idiag_dport, req->id.idiag_src[0],
 288                                  req->id.idiag_sport, req->id.idiag_if);
 289         }
 290 #if IS_ENABLED(CONFIG_IPV6)
 291         else if (req->sdiag_family == AF_INET6) {
 292                 sk = inet6_lookup(net, hashinfo,
 293                                   (struct in6_addr *)req->id.idiag_dst,
 294                                   req->id.idiag_dport,
 295                                   (struct in6_addr *)req->id.idiag_src,
 296                                   req->id.idiag_sport,
 297                                   req->id.idiag_if);
 298         }
 299 #endif
 300         else {
 301                 goto out_nosk;
 302         }
 303
 304         err = -ENOENT;
 305         if (sk == NULL)
 306                 goto out_nosk;
 307
 308         err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
 309         if (err)
 310                 goto out;
 311
 312         rep = nlmsg_new(sizeof(struct inet_diag_msg) +
 313                         sizeof(struct inet_diag_meminfo) +
 314                         sizeof(struct tcp_info) + 64, GFP_KERNEL);
 315         if (!rep) {
 316                 err = -ENOMEM;
 317                 goto out;
 318         }
 319
 320         err = sk_diag_fill(sk, rep, req,
 321                            sk_user_ns(NETLINK_CB(in_skb).ssk),
 322                            NETLINK_CB(in_skb).portid,
 323                            nlh->nlmsg_seq, 0, nlh);
 324         if (err < 0) {
 325                 WARN_ON(err == -EMSGSIZE);
 326                 nlmsg_free(rep);
 327                 goto out;
 328         }
 329         err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
 330                               MSG_DONTWAIT);
 331         if (err > 0)
 332                 err = 0;
 333
 334 out:
 335         if (sk) {
 336                 if (sk->sk_state == TCP_TIME_WAIT)
 337                         inet_twsk_put((struct inet_timewait_sock *)sk);
 338                 else
 339                         sock_put(sk);
 340         }
 341 out_nosk:
 342         return err;
 343 }
 344 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
 345
 346 static int inet_diag_get_exact(struct sk_buff *in_skb,
 347                                const struct nlmsghdr *nlh,
 348                                struct inet_diag_req_v2 *req)
 349 {
 350         const struct inet_diag_handler *handler;
 351         int err;
 352
 353         handler = inet_diag_lock_handler(req->sdiag_protocol);
 354         if (IS_ERR(handler))
 355                 err = PTR_ERR(handler);
 356         else
 357                 err = handler->dump_one(in_skb, nlh, req);
 358         inet_diag_unlock_handler(handler);
 359
 360         return err;
 361 }
 362
 363 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
 364 {
 365         int words = bits >> 5;
 366
 367         bits &= 0x1f;
 368
 369         if (words) {
 370                 if (memcmp(a1, a2, words << 2))
 371                         return 0;
 372         }
 373         if (bits) {
 374                 __be32 w1, w2;
 375                 __be32 mask;
 376
 377                 w1 = a1[words];
 378                 w2 = a2[words];
 379
 380                 mask = htonl((0xffffffff) << (32 - bits));
 381
 382                 if ((w1 ^ w2) & mask)
 383                         return 0;
 384         }
 385
 386         return 1;
 387 }
 388
 389
 390 static int inet_diag_bc_run(const struct nlattr *_bc,
 391                 const struct inet_diag_entry *entry)
 392 {
 393         const void *bc = nla_data(_bc);
 394         int len = nla_len(_bc);
 395
 396         while (len > 0) {
 397                 int yes = 1;
 398                 const struct inet_diag_bc_op *op = bc;
 399
 400                 switch (op->code) {
 401                 case INET_DIAG_BC_NOP:
 402                         break;
 403                 case INET_DIAG_BC_JMP:
 404                         yes = 0;
 405                         break;
 406                 case INET_DIAG_BC_S_GE:
 407                         yes = entry->sport >= op[1].no;
 408                         break;
 409                 case INET_DIAG_BC_S_LE:
 410                         yes = entry->sport <= op[1].no;
 411                         break;
 412                 case INET_DIAG_BC_D_GE:
 413                         yes = entry->dport >= op[1].no;
 414                         break;
 415                 case INET_DIAG_BC_D_LE:
 416                         yes = entry->dport <= op[1].no;
 417                         break;
 418                 case INET_DIAG_BC_AUTO:
 419                         yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
 420                         break;
 421                 case INET_DIAG_BC_S_COND:
 422                 case INET_DIAG_BC_D_COND: {
 423                         struct inet_diag_hostcond *cond;
 424                         __be32 *addr;
 425
 426                         cond = (struct inet_diag_hostcond *)(op + 1);
 427                         if (cond->port != -1 &&
 428                             cond->port != (op->code == INET_DIAG_BC_S_COND ?
 429                                              entry->sport : entry->dport)) {
 430                                 yes = 0;
 431                                 break;
 432                         }
 433
 434                         if (cond->prefix_len == 0)
 435                                 break;
 436
 437                         if (op->code == INET_DIAG_BC_S_COND)
 438                                 addr = entry->saddr;
 439                         else
 440                                 addr = entry->daddr;
 441
 442                         if (bitstring_match(addr, cond->addr,
 443                                             cond->prefix_len))
 444                                 break;
 445                         if (entry->family == AF_INET6 &&
 446                             cond->family == AF_INET) {
 447                                 if (addr[0] == 0 && addr[1] == 0 &&
 448                                     addr[2] == htonl(0xffff) &&
 449                                     bitstring_match(addr + 3, cond->addr,
 450                                                     cond->prefix_len))
 451                                         break;
 452                         }
 453                         yes = 0;
 454                         break;
 455                 }
 456                 }
 457
 458                 if (yes) {
 459                         len -= op->yes;
 460                         bc += op->yes;
 461                 } else {
 462                         len -= op->no;
 463                         bc += op->no;
 464                 }
 465         }
 466         return len == 0;
 467 }
 468
 469 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
 470 {
 471         struct inet_diag_entry entry;
 472         struct inet_sock *inet = inet_sk(sk);
 473
 474         if (bc == NULL)
 475                 return 1;
 476
 477         entry.family = sk->sk_family;
 478 #if IS_ENABLED(CONFIG_IPV6)
 479         if (entry.family == AF_INET6) {
 480                 struct ipv6_pinfo *np = inet6_sk(sk);
 481
 482                 entry.saddr = np->rcv_saddr.s6_addr32;
 483                 entry.daddr = np->daddr.s6_addr32;
 484         } else
 485 #endif
 486         {
 487                 entry.saddr = &inet->inet_rcv_saddr;
 488                 entry.daddr = &inet->inet_daddr;
 489         }
 490         entry.sport = inet->inet_num;
 491         entry.dport = ntohs(inet->inet_dport);
 492         entry.userlocks = sk->sk_userlocks;
 493
 494         return inet_diag_bc_run(bc, &entry);
 495 }
 496 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
 497
 498 static int valid_cc(const void *bc, int len, int cc)
 499 {
 500         while (len >= 0) {
 501                 const struct inet_diag_bc_op *op = bc;
 502
 503                 if (cc > len)
 504                         return 0;
 505                 if (cc == len)
 506                         return 1;
 507                 if (op->yes < 4 || op->yes & 3)
 508                         return 0;
 509                 len -= op->yes;
 510                 bc  += op->yes;
 511         }
 512         return 0;
 513 }
 514
 515 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
 516 {
 517         const void *bc = bytecode;
 518         int  len = bytecode_len;
 519
 520         while (len > 0) {
 521                 const struct inet_diag_bc_op *op = bc;
 522
 523 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
 524                 switch (op->code) {
 525                 case INET_DIAG_BC_AUTO:
 526                 case INET_DIAG_BC_S_COND:
 527                 case INET_DIAG_BC_D_COND:
 528                 case INET_DIAG_BC_S_GE:
 529                 case INET_DIAG_BC_S_LE:
 530                 case INET_DIAG_BC_D_GE:
 531                 case INET_DIAG_BC_D_LE:
 532                 case INET_DIAG_BC_JMP:
 533                         if (op->no < 4 || op->no > len + 4 || op->no & 3)
 534                                 return -EINVAL;
 535                         if (op->no < len &&
 536                             !valid_cc(bytecode, bytecode_len, len - op->no))
 537                                 return -EINVAL;
 538                         break;
 539                 case INET_DIAG_BC_NOP:
 540                         break;
 541                 default:
 542                         return -EINVAL;
 543                 }
 544                 if (op->yes < 4 || op->yes > len + 4 || op->yes & 3)
 545                         return -EINVAL;
 546                 bc  += op->yes;
 547                 len -= op->yes;
 548         }
 549         return len == 0 ? 0 : -EINVAL;
 550 }
 551
 552 static int inet_csk_diag_dump(struct sock *sk,
 553                               struct sk_buff *skb,
 554                               struct netlink_callback *cb,
 555                               struct inet_diag_req_v2 *r,
 556                               const struct nlattr *bc)
 557 {
 558         if (!inet_diag_bc_sk(bc, sk))
 559                 return 0;
 560
 561         return inet_csk_diag_fill(sk, skb, r,
 562                                   sk_user_ns(NETLINK_CB(cb->skb).ssk),
 563                                   NETLINK_CB(cb->skb).portid,
 564                                   cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
 565 }
 566
 567 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
 568                                struct sk_buff *skb,
 569                                struct netlink_callback *cb,
 570                                struct inet_diag_req_v2 *r,
 571                                const struct nlattr *bc)
 572 {
 573         if (bc != NULL) {
 574                 struct inet_diag_entry entry;
 575
 576                 entry.family = tw->tw_family;
 577 #if IS_ENABLED(CONFIG_IPV6)
 578                 if (tw->tw_family == AF_INET6) {
 579                         struct inet6_timewait_sock *tw6 =
 580                                                 inet6_twsk((struct sock *)tw);
 581                         entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
 582                         entry.daddr = tw6->tw_v6_daddr.s6_addr32;
 583                 } else
 584 #endif
 585                 {
 586                         entry.saddr = &tw->tw_rcv_saddr;
 587                         entry.daddr = &tw->tw_daddr;
 588                 }
 589                 entry.sport = tw->tw_num;
 590                 entry.dport = ntohs(tw->tw_dport);
 591                 entry.userlocks = 0;
 592
 593                 if (!inet_diag_bc_run(bc, &entry))
 594                         return 0;
 595         }
 596
 597         return inet_twsk_diag_fill(tw, skb, r,
 598                                    NETLINK_CB(cb->skb).portid,
 599                                    cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
 600 }
 601
 602 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
 603                               struct request_sock *req,
 604                               struct user_namespace *user_ns,
 605                               u32 portid, u32 seq,
 606                               const struct nlmsghdr *unlh)
 607 {
 608         const struct inet_request_sock *ireq = inet_rsk(req);
 609         struct inet_sock *inet = inet_sk(sk);
 610         struct inet_diag_msg *r;
 611         struct nlmsghdr *nlh;
 612         long tmo;
 613
 614         nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
 615                         NLM_F_MULTI);
 616         if (!nlh)
 617                 return -EMSGSIZE;
 618
 619         r = nlmsg_data(nlh);
 620         r->idiag_family = sk->sk_family;
 621         r->idiag_state = TCP_SYN_RECV;
 622         r->idiag_timer = 1;
 623         r->idiag_retrans = req->num_retrans;
 624
 625         r->id.idiag_if = sk->sk_bound_dev_if;
 626         sock_diag_save_cookie(req, r->id.idiag_cookie);
 627
 628         tmo = req->expires - jiffies;
 629         if (tmo < 0)
 630                 tmo = 0;
 631
 632         r->id.idiag_sport = inet->inet_sport;
 633         r->id.idiag_dport = ireq->rmt_port;
 634         r->id.idiag_src[0] = ireq->loc_addr;
 635         r->id.idiag_dst[0] = ireq->rmt_addr;
 636         r->idiag_expires = jiffies_to_msecs(tmo);
 637         r->idiag_rqueue = 0;
 638         r->idiag_wqueue = 0;
 639         r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
 640         r->idiag_inode = 0;
 641 #if IS_ENABLED(CONFIG_IPV6)
 642         if (r->idiag_family == AF_INET6) {
 643                 *(struct in6_addr *)r->id.idiag_src = inet6_rsk(req)->loc_addr;
 644                 *(struct in6_addr *)r->id.idiag_dst = inet6_rsk(req)->rmt_addr;
 645         }
 646 #endif
 647
 648         return nlmsg_end(skb, nlh);
 649 }
 650
 651 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
 652                                struct netlink_callback *cb,
 653                                struct inet_diag_req_v2 *r,
 654                                const struct nlattr *bc)
 655 {
 656         struct inet_diag_entry entry;
 657         struct inet_connection_sock *icsk = inet_csk(sk);
 658         struct listen_sock *lopt;
 659         struct inet_sock *inet = inet_sk(sk);
 660         int j, s_j;
 661         int reqnum, s_reqnum;
 662         int err = 0;
 663
 664         s_j = cb->args[3];
 665         s_reqnum = cb->args[4];
 666
 667         if (s_j > 0)
 668                 s_j--;
 669
 670         entry.family = sk->sk_family;
 671
 672         read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 673
 674         lopt = icsk->icsk_accept_queue.listen_opt;
 675         if (!lopt || !lopt->qlen)
 676                 goto out;
 677
 678         if (bc != NULL) {
 679                 entry.sport = inet->inet_num;
 680                 entry.userlocks = sk->sk_userlocks;
 681         }
 682
 683         for (j = s_j; j < lopt->nr_table_entries; j++) {
 684                 struct request_sock *req, *head = lopt->syn_table[j];
 685
 686                 reqnum = 0;
 687                 for (req = head; req; reqnum++, req = req->dl_next) {
 688                         struct inet_request_sock *ireq = inet_rsk(req);
 689
 690                         if (reqnum < s_reqnum)
 691                                 continue;
 692                         if (r->id.idiag_dport != ireq->rmt_port &&
 693                             r->id.idiag_dport)
 694                                 continue;
 695
 696                         if (bc) {
 697                                 entry.saddr =
 698 #if IS_ENABLED(CONFIG_IPV6)
 699                                         (entry.family == AF_INET6) ?
 700                                         inet6_rsk(req)->loc_addr.s6_addr32 :
 701 #endif
 702                                         &ireq->loc_addr;
 703                                 entry.daddr =
 704 #if IS_ENABLED(CONFIG_IPV6)
 705                                         (entry.family == AF_INET6) ?
 706                                         inet6_rsk(req)->rmt_addr.s6_addr32 :
 707 #endif
 708                                         &ireq->rmt_addr;
 709                                 entry.dport = ntohs(ireq->rmt_port);
 710
 711                                 if (!inet_diag_bc_run(bc, &entry))
 712                                         continue;
 713                         }
 714
 715                         err = inet_diag_fill_req(skb, sk, req,
 716                                                sk_user_ns(NETLINK_CB(cb->skb).ssk),
 717                                                NETLINK_CB(cb->skb).portid,
 718                                                cb->nlh->nlmsg_seq, cb->nlh);
 719                         if (err < 0) {
 720                                 cb->args[3] = j + 1;
 721                                 cb->args[4] = reqnum;
 722                                 goto out;
 723                         }
 724                 }
 725
 726                 s_reqnum = 0;
 727         }
 728
 729 out:
 730         read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 731
 732         return err;
 733 }
 734
 735 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
 736                 struct netlink_callback *cb, struct inet_diag_req_v2 *r, struct nlattr *bc)
 737 {
 738         int i, num;
 739         int s_i, s_num;
 740         struct net *net = sock_net(skb->sk);
 741
 742         s_i = cb->args[1];
 743         s_num = num = cb->args[2];
 744
 745         if (cb->args[0] == 0) {
 746                 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
 747                         goto skip_listen_ht;
 748
 749                 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
 750                         struct sock *sk;
 751                         struct hlist_nulls_node *node;
 752                         struct inet_listen_hashbucket *ilb;
 753
 754                         num = 0;
 755                         ilb = &hashinfo->listening_hash[i];
 756                         spin_lock_bh(&ilb->lock);
 757                         sk_nulls_for_each(sk, node, &ilb->head) {
 758                                 struct inet_sock *inet = inet_sk(sk);
 759
 760                                 if (!net_eq(sock_net(sk), net))
 761                                         continue;
 762
 763                                 if (num < s_num) {
 764                                         num++;
 765                                         continue;
 766                                 }
 767
 768                                 if (r->sdiag_family != AF_UNSPEC &&
 769                                                 sk->sk_family != r->sdiag_family)
 770                                         goto next_listen;
 771
 772                                 if (r->id.idiag_sport != inet->inet_sport &&
 773                                     r->id.idiag_sport)
 774                                         goto next_listen;
 775
 776                                 if (!(r->idiag_states & TCPF_LISTEN) ||
 777                                     r->id.idiag_dport ||
 778                                     cb->args[3] > 0)
 779                                         goto syn_recv;
 780
 781                                 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
 782                                         spin_unlock_bh(&ilb->lock);
 783                                         goto done;
 784                                 }
 785
 786 syn_recv:
 787                                 if (!(r->idiag_states & TCPF_SYN_RECV))
 788                                         goto next_listen;
 789
 790                                 if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) {
 791                                         spin_unlock_bh(&ilb->lock);
 792                                         goto done;
 793                                 }
 794
 795 next_listen:
 796                                 cb->args[3] = 0;
 797                                 cb->args[4] = 0;
 798                                 ++num;
 799                         }
 800                         spin_unlock_bh(&ilb->lock);
 801
 802                         s_num = 0;
 803                         cb->args[3] = 0;
 804                         cb->args[4] = 0;
 805                 }
 806 skip_listen_ht:
 807                 cb->args[0] = 1;
 808                 s_i = num = s_num = 0;
 809         }
 810
 811         if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
 812                 goto out;
 813
 814         for (i = s_i; i <= hashinfo->ehash_mask; i++) {
 815                 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
 816                 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
 817                 struct sock *sk;
 818                 struct hlist_nulls_node *node;
 819
 820                 num = 0;
 821
 822                 if (hlist_nulls_empty(&head->chain) &&
 823                         hlist_nulls_empty(&head->twchain))
 824                         continue;
 825
 826                 if (i > s_i)
 827                         s_num = 0;
 828
 829                 spin_lock_bh(lock);
 830                 sk_nulls_for_each(sk, node, &head->chain) {
 831                         struct inet_sock *inet = inet_sk(sk);
 832
 833                         if (!net_eq(sock_net(sk), net))
 834                                 continue;
 835                         if (num < s_num)
 836                                 goto next_normal;
 837                         if (!(r->idiag_states & (1 << sk->sk_state)))
 838                                 goto next_normal;
 839                         if (r->sdiag_family != AF_UNSPEC &&
 840                                         sk->sk_family != r->sdiag_family)
 841                                 goto next_normal;
 842                         if (r->id.idiag_sport != inet->inet_sport &&
 843                             r->id.idiag_sport)
 844                                 goto next_normal;
 845                         if (r->id.idiag_dport != inet->inet_dport &&
 846                             r->id.idiag_dport)
 847                                 goto next_normal;
 848                         if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
 849                                 spin_unlock_bh(lock);
 850                                 goto done;
 851                         }
 852 next_normal:
 853                         ++num;
 854                 }
 855
 856                 if (r->idiag_states & TCPF_TIME_WAIT) {
 857                         struct inet_timewait_sock *tw;
 858
 859                         inet_twsk_for_each(tw, node,
 860                                     &head->twchain) {
 861                                 if (!net_eq(twsk_net(tw), net))
 862                                         continue;
 863
 864                                 if (num < s_num)
 865                                         goto next_dying;
 866                                 if (r->sdiag_family != AF_UNSPEC &&
 867                                                 tw->tw_family != r->sdiag_family)
 868                                         goto next_dying;
 869                                 if (r->id.idiag_sport != tw->tw_sport &&
 870                                     r->id.idiag_sport)
 871                                         goto next_dying;
 872                                 if (r->id.idiag_dport != tw->tw_dport &&
 873                                     r->id.idiag_dport)
 874                                         goto next_dying;
 875                                 if (inet_twsk_diag_dump(tw, skb, cb, r, bc) < 0) {
 876                                         spin_unlock_bh(lock);
 877                                         goto done;
 878                                 }
 879 next_dying:
 880                                 ++num;
 881                         }
 882                 }
 883                 spin_unlock_bh(lock);
 884         }
 885
 886 done:
 887         cb->args[1] = i;
 888         cb->args[2] = num;
 889 out:
 890         ;
 891 }
 892 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
 893
 894 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
 895                 struct inet_diag_req_v2 *r, struct nlattr *bc)
 896 {
 897         const struct inet_diag_handler *handler;
 898
 899         handler = inet_diag_lock_handler(r->sdiag_protocol);
 900         if (!IS_ERR(handler))
 901                 handler->dump(skb, cb, r, bc);
 902         inet_diag_unlock_handler(handler);
 903
 904         return 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 */);