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 #define INET_DIAG_PUT(skb, attrtype, attrlen) \
  50         RTA_DATA(__RTA_PUT(skb, attrtype, attrlen))
  51
  52 static DEFINE_MUTEX(inet_diag_table_mutex);
  53
  54 static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
  55 {
  56         if (!inet_diag_table[proto])
  57                 request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
  58                                NETLINK_SOCK_DIAG, proto);
  59
  60         mutex_lock(&inet_diag_table_mutex);
  61         if (!inet_diag_table[proto])
  62                 return ERR_PTR(-ENOENT);
  63
  64         return inet_diag_table[proto];
  65 }
  66
  67 static inline void inet_diag_unlock_handler(
  68         const struct inet_diag_handler *handler)
  69 {
  70         mutex_unlock(&inet_diag_table_mutex);
  71 }
  72
  73 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
  74                               struct sk_buff *skb, struct inet_diag_req *req,
  75                               u32 pid, u32 seq, u16 nlmsg_flags,
  76                               const struct nlmsghdr *unlh)
  77 {
  78         const struct inet_sock *inet = inet_sk(sk);
  79         struct inet_diag_msg *r;
  80         struct nlmsghdr  *nlh;
  81         void *info = NULL;
  82         struct inet_diag_meminfo  *minfo = NULL;
  83         unsigned char    *b = skb_tail_pointer(skb);
  84         const struct inet_diag_handler *handler;
  85         int ext = req->idiag_ext;
  86
  87         handler = inet_diag_table[req->sdiag_protocol];
  88         BUG_ON(handler == NULL);
  89
  90         nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
  91         nlh->nlmsg_flags = nlmsg_flags;
  92
  93         r = NLMSG_DATA(nlh);
  94         BUG_ON(sk->sk_state == TCP_TIME_WAIT);
  95
  96         if (ext & (1 << (INET_DIAG_MEMINFO - 1)))
  97                 minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo));
  98
  99         r->idiag_family = sk->sk_family;
 100         r->idiag_state = sk->sk_state;
 101         r->idiag_timer = 0;
 102         r->idiag_retrans = 0;
 103
 104         r->id.idiag_if = sk->sk_bound_dev_if;
 105         r->id.idiag_cookie[0] = (u32)(unsigned long)sk;
 106         r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
 107
 108         r->id.idiag_sport = inet->inet_sport;
 109         r->id.idiag_dport = inet->inet_dport;
 110         r->id.idiag_src[0] = inet->inet_rcv_saddr;
 111         r->id.idiag_dst[0] = inet->inet_daddr;
 112
 113         /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
 114          * hence this needs to be included regardless of socket family.
 115          */
 116         if (ext & (1 << (INET_DIAG_TOS - 1)))
 117                 RTA_PUT_U8(skb, INET_DIAG_TOS, inet->tos);
 118
 119 #if IS_ENABLED(CONFIG_IPV6)
 120         if (r->idiag_family == AF_INET6) {
 121                 const struct ipv6_pinfo *np = inet6_sk(sk);
 122
 123                 *(struct in6_addr *)r->id.idiag_src = np->rcv_saddr;
 124                 *(struct in6_addr *)r->id.idiag_dst = np->daddr;
 125                 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
 126                         RTA_PUT_U8(skb, INET_DIAG_TCLASS, np->tclass);
 127         }
 128 #endif
 129
 130         r->idiag_uid = sock_i_uid(sk);
 131         r->idiag_inode = sock_i_ino(sk);
 132
 133         if (minfo) {
 134                 minfo->idiag_rmem = sk_rmem_alloc_get(sk);
 135                 minfo->idiag_wmem = sk->sk_wmem_queued;
 136                 minfo->idiag_fmem = sk->sk_forward_alloc;
 137                 minfo->idiag_tmem = sk_wmem_alloc_get(sk);
 138         }
 139
 140         if (icsk == NULL) {
 141                 r->idiag_rqueue = r->idiag_wqueue = 0;
 142                 goto out;
 143         }
 144
 145 #define EXPIRES_IN_MS(tmo)  DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
 146
 147         if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
 148                 r->idiag_timer = 1;
 149                 r->idiag_retrans = icsk->icsk_retransmits;
 150                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
 151         } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
 152                 r->idiag_timer = 4;
 153                 r->idiag_retrans = icsk->icsk_probes_out;
 154                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
 155         } else if (timer_pending(&sk->sk_timer)) {
 156                 r->idiag_timer = 2;
 157                 r->idiag_retrans = icsk->icsk_probes_out;
 158                 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
 159         } else {
 160                 r->idiag_timer = 0;
 161                 r->idiag_expires = 0;
 162         }
 163 #undef EXPIRES_IN_MS
 164
 165         if (ext & (1 << (INET_DIAG_INFO - 1)))
 166                 info = INET_DIAG_PUT(skb, INET_DIAG_INFO, sizeof(struct tcp_info));
 167
 168         if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) {
 169                 const size_t len = strlen(icsk->icsk_ca_ops->name);
 170
 171                 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1),
 172                        icsk->icsk_ca_ops->name);
 173         }
 174
 175         handler->idiag_get_info(sk, r, info);
 176
 177         if (sk->sk_state < TCP_TIME_WAIT &&
 178             icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
 179                 icsk->icsk_ca_ops->get_info(sk, ext, skb);
 180
 181 out:
 182         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
 183         return skb->len;
 184
 185 rtattr_failure:
 186 nlmsg_failure:
 187         nlmsg_trim(skb, b);
 188         return -EMSGSIZE;
 189 }
 190 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
 191
 192 static int inet_csk_diag_fill(struct sock *sk,
 193                               struct sk_buff *skb, struct inet_diag_req *req,
 194                               u32 pid, u32 seq, u16 nlmsg_flags,
 195                               const struct nlmsghdr *unlh)
 196 {
 197         return inet_sk_diag_fill(sk, inet_csk(sk),
 198                         skb, req, pid, seq, nlmsg_flags, unlh);
 199 }
 200
 201 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
 202                                struct sk_buff *skb, struct inet_diag_req *req,
 203                                u32 pid, u32 seq, u16 nlmsg_flags,
 204                                const struct nlmsghdr *unlh)
 205 {
 206         long tmo;
 207         struct inet_diag_msg *r;
 208         const unsigned char *previous_tail = skb_tail_pointer(skb);
 209         struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq,
 210                                          unlh->nlmsg_type, sizeof(*r));
 211
 212         r = NLMSG_DATA(nlh);
 213         BUG_ON(tw->tw_state != TCP_TIME_WAIT);
 214
 215         nlh->nlmsg_flags = nlmsg_flags;
 216
 217         tmo = tw->tw_ttd - jiffies;
 218         if (tmo < 0)
 219                 tmo = 0;
 220
 221         r->idiag_family       = tw->tw_family;
 222         r->idiag_retrans      = 0;
 223         r->id.idiag_if        = tw->tw_bound_dev_if;
 224         r->id.idiag_cookie[0] = (u32)(unsigned long)tw;
 225         r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1);
 226         r->id.idiag_sport     = tw->tw_sport;
 227         r->id.idiag_dport     = tw->tw_dport;
 228         r->id.idiag_src[0]    = tw->tw_rcv_saddr;
 229         r->id.idiag_dst[0]    = tw->tw_daddr;
 230         r->idiag_state        = tw->tw_substate;
 231         r->idiag_timer        = 3;
 232         r->idiag_expires      = DIV_ROUND_UP(tmo * 1000, HZ);
 233         r->idiag_rqueue       = 0;
 234         r->idiag_wqueue       = 0;
 235         r->idiag_uid          = 0;
 236         r->idiag_inode        = 0;
 237 #if IS_ENABLED(CONFIG_IPV6)
 238         if (tw->tw_family == AF_INET6) {
 239                 const struct inet6_timewait_sock *tw6 =
 240                                                 inet6_twsk((struct sock *)tw);
 241
 242                 *(struct in6_addr *)r->id.idiag_src = tw6->tw_v6_rcv_saddr;
 243                 *(struct in6_addr *)r->id.idiag_dst = tw6->tw_v6_daddr;
 244         }
 245 #endif
 246         nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail;
 247         return skb->len;
 248 nlmsg_failure:
 249         nlmsg_trim(skb, previous_tail);
 250         return -EMSGSIZE;
 251 }
 252
 253 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
 254                         struct inet_diag_req *r, u32 pid, u32 seq, u16 nlmsg_flags,
 255                         const struct nlmsghdr *unlh)
 256 {
 257         if (sk->sk_state == TCP_TIME_WAIT)
 258                 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
 259                                            skb, r, pid, seq, nlmsg_flags,
 260                                            unlh);
 261         return inet_csk_diag_fill(sk, skb, r, pid, seq, nlmsg_flags, unlh);
 262 }
 263
 264 int inet_diag_check_cookie(struct sock *sk, struct inet_diag_req *req)
 265 {
 266         if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE ||
 267              req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) &&
 268             ((u32)(unsigned long)sk != req->id.idiag_cookie[0] ||
 269              (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1]))
 270                 return -ESTALE;
 271         else
 272                 return 0;
 273 }
 274 EXPORT_SYMBOL_GPL(inet_diag_check_cookie);
 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 *req)
 278 {
 279         int err;
 280         struct sock *sk;
 281         struct sk_buff *rep;
 282
 283         err = -EINVAL;
 284         if (req->sdiag_family == AF_INET) {
 285                 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0],
 286                                  req->id.idiag_dport, req->id.idiag_src[0],
 287                                  req->id.idiag_sport, req->id.idiag_if);
 288         }
 289 #if IS_ENABLED(CONFIG_IPV6)
 290         else if (req->sdiag_family == AF_INET6) {
 291                 sk = inet6_lookup(&init_net, hashinfo,
 292                                   (struct in6_addr *)req->id.idiag_dst,
 293                                   req->id.idiag_dport,
 294                                   (struct in6_addr *)req->id.idiag_src,
 295                                   req->id.idiag_sport,
 296                                   req->id.idiag_if);
 297         }
 298 #endif
 299         else {
 300                 goto out_nosk;
 301         }
 302
 303         err = -ENOENT;
 304         if (sk == NULL)
 305                 goto out_nosk;
 306
 307         err = inet_diag_check_cookie(sk, req);
 308         if (err)
 309                 goto out;
 310
 311         err = -ENOMEM;
 312         rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
 313                                      sizeof(struct inet_diag_meminfo) +
 314                                      sizeof(struct tcp_info) + 64)),
 315                         GFP_KERNEL);
 316         if (!rep)
 317                 goto out;
 318
 319         err = sk_diag_fill(sk, rep, req,
 320                            NETLINK_CB(in_skb).pid,
 321                            nlh->nlmsg_seq, 0, nlh);
 322         if (err < 0) {
 323                 WARN_ON(err == -EMSGSIZE);
 324                 kfree_skb(rep);
 325                 goto out;
 326         }
 327         err = netlink_unicast(sock_diag_nlsk, rep, NETLINK_CB(in_skb).pid,
 328                               MSG_DONTWAIT);
 329         if (err > 0)
 330                 err = 0;
 331
 332 out:
 333         if (sk) {
 334                 if (sk->sk_state == TCP_TIME_WAIT)
 335                         inet_twsk_put((struct inet_timewait_sock *)sk);
 336                 else
 337                         sock_put(sk);
 338         }
 339 out_nosk:
 340         return err;
 341 }
 342 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
 343
 344 static int inet_diag_get_exact(struct sk_buff *in_skb,
 345                                const struct nlmsghdr *nlh,
 346                                struct inet_diag_req *req)
 347 {
 348         const struct inet_diag_handler *handler;
 349         int err;
 350
 351         handler = inet_diag_lock_handler(req->sdiag_protocol);
 352         if (IS_ERR(handler))
 353                 err = PTR_ERR(handler);
 354         else
 355                 err = handler->dump_one(in_skb, nlh, req);
 356         inet_diag_unlock_handler(handler);
 357
 358         return err;
 359 }
 360
 361 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
 362 {
 363         int words = bits >> 5;
 364
 365         bits &= 0x1f;
 366
 367         if (words) {
 368                 if (memcmp(a1, a2, words << 2))
 369                         return 0;
 370         }
 371         if (bits) {
 372                 __be32 w1, w2;
 373                 __be32 mask;
 374
 375                 w1 = a1[words];
 376                 w2 = a2[words];
 377
 378                 mask = htonl((0xffffffff) << (32 - bits));
 379
 380                 if ((w1 ^ w2) & mask)
 381                         return 0;
 382         }
 383
 384         return 1;
 385 }
 386
 387
 388 static int inet_diag_bc_run(const struct nlattr *_bc,
 389                 const struct inet_diag_entry *entry)
 390 {
 391         const void *bc = nla_data(_bc);
 392         int len = nla_len(_bc);
 393
 394         while (len > 0) {
 395                 int yes = 1;
 396                 const struct inet_diag_bc_op *op = bc;
 397
 398                 switch (op->code) {
 399                 case INET_DIAG_BC_NOP:
 400                         break;
 401                 case INET_DIAG_BC_JMP:
 402                         yes = 0;
 403                         break;
 404                 case INET_DIAG_BC_S_GE:
 405                         yes = entry->sport >= op[1].no;
 406                         break;
 407                 case INET_DIAG_BC_S_LE:
 408                         yes = entry->sport <= op[1].no;
 409                         break;
 410                 case INET_DIAG_BC_D_GE:
 411                         yes = entry->dport >= op[1].no;
 412                         break;
 413                 case INET_DIAG_BC_D_LE:
 414                         yes = entry->dport <= op[1].no;
 415                         break;
 416                 case INET_DIAG_BC_AUTO:
 417                         yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
 418                         break;
 419                 case INET_DIAG_BC_S_COND:
 420                 case INET_DIAG_BC_D_COND: {
 421                         struct inet_diag_hostcond *cond;
 422                         __be32 *addr;
 423
 424                         cond = (struct inet_diag_hostcond *)(op + 1);
 425                         if (cond->port != -1 &&
 426                             cond->port != (op->code == INET_DIAG_BC_S_COND ?
 427                                              entry->sport : entry->dport)) {
 428                                 yes = 0;
 429                                 break;
 430                         }
 431
 432                         if (cond->prefix_len == 0)
 433                                 break;
 434
 435                         if (op->code == INET_DIAG_BC_S_COND)
 436                                 addr = entry->saddr;
 437                         else
 438                                 addr = entry->daddr;
 439
 440                         if (bitstring_match(addr, cond->addr,
 441                                             cond->prefix_len))
 442                                 break;
 443                         if (entry->family == AF_INET6 &&
 444                             cond->family == AF_INET) {
 445                                 if (addr[0] == 0 && addr[1] == 0 &&
 446                                     addr[2] == htonl(0xffff) &&
 447                                     bitstring_match(addr + 3, cond->addr,
 448                                                     cond->prefix_len))
 449                                         break;
 450                         }
 451                         yes = 0;
 452                         break;
 453                 }
 454                 }
 455
 456                 if (yes) {
 457                         len -= op->yes;
 458                         bc += op->yes;
 459                 } else {
 460                         len -= op->no;
 461                         bc += op->no;
 462                 }
 463         }
 464         return len == 0;
 465 }
 466
 467 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
 468 {
 469         struct inet_diag_entry entry;
 470         struct inet_sock *inet = inet_sk(sk);
 471
 472         if (bc == NULL)
 473                 return 1;
 474
 475         entry.family = sk->sk_family;
 476 #if IS_ENABLED(CONFIG_IPV6)
 477         if (entry.family == AF_INET6) {
 478                 struct ipv6_pinfo *np = inet6_sk(sk);
 479
 480                 entry.saddr = np->rcv_saddr.s6_addr32;
 481                 entry.daddr = np->daddr.s6_addr32;
 482         } else
 483 #endif
 484         {
 485                 entry.saddr = &inet->inet_rcv_saddr;
 486                 entry.daddr = &inet->inet_daddr;
 487         }
 488         entry.sport = inet->inet_num;
 489         entry.dport = ntohs(inet->inet_dport);
 490         entry.userlocks = sk->sk_userlocks;
 491
 492         return inet_diag_bc_run(bc, &entry);
 493 }
 494 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
 495
 496 static int valid_cc(const void *bc, int len, int cc)
 497 {
 498         while (len >= 0) {
 499                 const struct inet_diag_bc_op *op = bc;
 500
 501                 if (cc > len)
 502                         return 0;
 503                 if (cc == len)
 504                         return 1;
 505                 if (op->yes < 4 || op->yes & 3)
 506                         return 0;
 507                 len -= op->yes;
 508                 bc  += op->yes;
 509         }
 510         return 0;
 511 }
 512
 513 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
 514 {
 515         const void *bc = bytecode;
 516         int  len = bytecode_len;
 517
 518         while (len > 0) {
 519                 const struct inet_diag_bc_op *op = bc;
 520
 521 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
 522                 switch (op->code) {
 523                 case INET_DIAG_BC_AUTO:
 524                 case INET_DIAG_BC_S_COND:
 525                 case INET_DIAG_BC_D_COND:
 526                 case INET_DIAG_BC_S_GE:
 527                 case INET_DIAG_BC_S_LE:
 528                 case INET_DIAG_BC_D_GE:
 529                 case INET_DIAG_BC_D_LE:
 530                 case INET_DIAG_BC_JMP:
 531                         if (op->no < 4 || op->no > len + 4 || op->no & 3)
 532                                 return -EINVAL;
 533                         if (op->no < len &&
 534                             !valid_cc(bytecode, bytecode_len, len - op->no))
 535                                 return -EINVAL;
 536                         break;
 537                 case INET_DIAG_BC_NOP:
 538                         break;
 539                 default:
 540                         return -EINVAL;
 541                 }
 542                 if (op->yes < 4 || op->yes > len + 4 || op->yes & 3)
 543                         return -EINVAL;
 544                 bc  += op->yes;
 545                 len -= op->yes;
 546         }
 547         return len == 0 ? 0 : -EINVAL;
 548 }
 549
 550 static int inet_csk_diag_dump(struct sock *sk,
 551                               struct sk_buff *skb,
 552                               struct netlink_callback *cb,
 553                               struct inet_diag_req *r,
 554                               const struct nlattr *bc)
 555 {
 556         if (!inet_diag_bc_sk(bc, sk))
 557                 return 0;
 558
 559         return inet_csk_diag_fill(sk, skb, r,
 560                                   NETLINK_CB(cb->skb).pid,
 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 *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).pid,
 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, u32 pid, u32 seq,
 601                               const struct nlmsghdr *unlh)
 602 {
 603         const struct inet_request_sock *ireq = inet_rsk(req);
 604         struct inet_sock *inet = inet_sk(sk);
 605         unsigned char *b = skb_tail_pointer(skb);
 606         struct inet_diag_msg *r;
 607         struct nlmsghdr *nlh;
 608         long tmo;
 609
 610         nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
 611         nlh->nlmsg_flags = NLM_F_MULTI;
 612         r = NLMSG_DATA(nlh);
 613
 614         r->idiag_family = sk->sk_family;
 615         r->idiag_state = TCP_SYN_RECV;
 616         r->idiag_timer = 1;
 617         r->idiag_retrans = req->retrans;
 618
 619         r->id.idiag_if = sk->sk_bound_dev_if;
 620         r->id.idiag_cookie[0] = (u32)(unsigned long)req;
 621         r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
 622
 623         tmo = req->expires - jiffies;
 624         if (tmo < 0)
 625                 tmo = 0;
 626
 627         r->id.idiag_sport = inet->inet_sport;
 628         r->id.idiag_dport = ireq->rmt_port;
 629         r->id.idiag_src[0] = ireq->loc_addr;
 630         r->id.idiag_dst[0] = ireq->rmt_addr;
 631         r->idiag_expires = jiffies_to_msecs(tmo);
 632         r->idiag_rqueue = 0;
 633         r->idiag_wqueue = 0;
 634         r->idiag_uid = sock_i_uid(sk);
 635         r->idiag_inode = 0;
 636 #if IS_ENABLED(CONFIG_IPV6)
 637         if (r->idiag_family == AF_INET6) {
 638                 *(struct in6_addr *)r->id.idiag_src = inet6_rsk(req)->loc_addr;
 639                 *(struct in6_addr *)r->id.idiag_dst = inet6_rsk(req)->rmt_addr;
 640         }
 641 #endif
 642         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
 643
 644         return skb->len;
 645
 646 nlmsg_failure:
 647         nlmsg_trim(skb, b);
 648         return -1;
 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 *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                                                NETLINK_CB(cb->skb).pid,
 717                                                cb->nlh->nlmsg_seq, cb->nlh);
 718                         if (err < 0) {
 719                                 cb->args[3] = j + 1;
 720                                 cb->args[4] = reqnum;
 721                                 goto out;
 722                         }
 723                 }
 724
 725                 s_reqnum = 0;
 726         }
 727
 728 out:
 729         read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 730
 731         return err;
 732 }
 733
 734 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
 735                 struct netlink_callback *cb, struct inet_diag_req *r, struct nlattr *bc)
 736 {
 737         int i, num;
 738         int s_i, s_num;
 739
 740         s_i = cb->args[1];
 741         s_num = num = cb->args[2];
 742
 743         if (cb->args[0] == 0) {
 744                 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
 745                         goto skip_listen_ht;
 746
 747                 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
 748                         struct sock *sk;
 749                         struct hlist_nulls_node *node;
 750                         struct inet_listen_hashbucket *ilb;
 751
 752                         num = 0;
 753                         ilb = &hashinfo->listening_hash[i];
 754                         spin_lock_bh(&ilb->lock);
 755                         sk_nulls_for_each(sk, node, &ilb->head) {
 756                                 struct inet_sock *inet = inet_sk(sk);
 757
 758                                 if (num < s_num) {
 759                                         num++;
 760                                         continue;
 761                                 }
 762
 763                                 if (r->sdiag_family != AF_UNSPEC &&
 764                                                 sk->sk_family != r->sdiag_family)
 765                                         goto next_listen;
 766
 767                                 if (r->id.idiag_sport != inet->inet_sport &&
 768                                     r->id.idiag_sport)
 769                                         goto next_listen;
 770
 771                                 if (!(r->idiag_states & TCPF_LISTEN) ||
 772                                     r->id.idiag_dport ||
 773                                     cb->args[3] > 0)
 774                                         goto syn_recv;
 775
 776                                 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
 777                                         spin_unlock_bh(&ilb->lock);
 778                                         goto done;
 779                                 }
 780
 781 syn_recv:
 782                                 if (!(r->idiag_states & TCPF_SYN_RECV))
 783                                         goto next_listen;
 784
 785                                 if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) {
 786                                         spin_unlock_bh(&ilb->lock);
 787                                         goto done;
 788                                 }
 789
 790 next_listen:
 791                                 cb->args[3] = 0;
 792                                 cb->args[4] = 0;
 793                                 ++num;
 794                         }
 795                         spin_unlock_bh(&ilb->lock);
 796
 797                         s_num = 0;
 798                         cb->args[3] = 0;
 799                         cb->args[4] = 0;
 800                 }
 801 skip_listen_ht:
 802                 cb->args[0] = 1;
 803                 s_i = num = s_num = 0;
 804         }
 805
 806         if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
 807                 goto out;
 808
 809         for (i = s_i; i <= hashinfo->ehash_mask; i++) {
 810                 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
 811                 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
 812                 struct sock *sk;
 813                 struct hlist_nulls_node *node;
 814
 815                 num = 0;
 816
 817                 if (hlist_nulls_empty(&head->chain) &&
 818                         hlist_nulls_empty(&head->twchain))
 819                         continue;
 820
 821                 if (i > s_i)
 822                         s_num = 0;
 823
 824                 spin_lock_bh(lock);
 825                 sk_nulls_for_each(sk, node, &head->chain) {
 826                         struct inet_sock *inet = inet_sk(sk);
 827
 828                         if (num < s_num)
 829                                 goto next_normal;
 830                         if (!(r->idiag_states & (1 << sk->sk_state)))
 831                                 goto next_normal;
 832                         if (r->sdiag_family != AF_UNSPEC &&
 833                                         sk->sk_family != r->sdiag_family)
 834                                 goto next_normal;
 835                         if (r->id.idiag_sport != inet->inet_sport &&
 836                             r->id.idiag_sport)
 837                                 goto next_normal;
 838                         if (r->id.idiag_dport != inet->inet_dport &&
 839                             r->id.idiag_dport)
 840                                 goto next_normal;
 841                         if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
 842                                 spin_unlock_bh(lock);
 843                                 goto done;
 844                         }
 845 next_normal:
 846                         ++num;
 847                 }
 848
 849                 if (r->idiag_states & TCPF_TIME_WAIT) {
 850                         struct inet_timewait_sock *tw;
 851
 852                         inet_twsk_for_each(tw, node,
 853                                     &head->twchain) {
 854
 855                                 if (num < s_num)
 856                                         goto next_dying;
 857                                 if (r->sdiag_family != AF_UNSPEC &&
 858                                                 tw->tw_family != r->sdiag_family)
 859                                         goto next_dying;
 860                                 if (r->id.idiag_sport != tw->tw_sport &&
 861                                     r->id.idiag_sport)
 862                                         goto next_dying;
 863                                 if (r->id.idiag_dport != tw->tw_dport &&
 864                                     r->id.idiag_dport)
 865                                         goto next_dying;
 866                                 if (inet_twsk_diag_dump(tw, skb, cb, r, bc) < 0) {
 867                                         spin_unlock_bh(lock);
 868                                         goto done;
 869                                 }
 870 next_dying:
 871                                 ++num;
 872                         }
 873                 }
 874                 spin_unlock_bh(lock);
 875         }
 876
 877 done:
 878         cb->args[1] = i;
 879         cb->args[2] = num;
 880 out:
 881         ;
 882 }
 883 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
 884
 885 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
 886                 struct inet_diag_req *r, struct nlattr *bc)
 887 {
 888         const struct inet_diag_handler *handler;
 889
 890         handler = inet_diag_lock_handler(r->sdiag_protocol);
 891         if (!IS_ERR(handler))
 892                 handler->dump(skb, cb, r, bc);
 893         inet_diag_unlock_handler(handler);
 894
 895         return skb->len;
 896 }
 897
 898 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
 899 {
 900         struct nlattr *bc = NULL;
 901         int hdrlen = sizeof(struct inet_diag_req);
 902
 903         if (nlmsg_attrlen(cb->nlh, hdrlen))
 904                 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
 905
 906         return __inet_diag_dump(skb, cb, (struct inet_diag_req *)NLMSG_DATA(cb->nlh), bc);
 907 }
 908
 909 static inline int inet_diag_type2proto(int type)
 910 {
 911         switch (type) {
 912         case TCPDIAG_GETSOCK:
 913                 return IPPROTO_TCP;
 914         case DCCPDIAG_GETSOCK:
 915                 return IPPROTO_DCCP;
 916         default:
 917                 return 0;
 918         }
 919 }
 920
 921 static int inet_diag_dump_compat(struct sk_buff *skb, struct netlink_callback *cb)
 922 {
 923         struct inet_diag_req_compat *rc = NLMSG_DATA(cb->nlh);
 924         struct inet_diag_req req;
 925         struct nlattr *bc = NULL;
 926         int hdrlen = sizeof(struct inet_diag_req_compat);
 927
 928         req.sdiag_family = AF_UNSPEC; /* compatibility */
 929         req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
 930         req.idiag_ext = rc->idiag_ext;
 931         req.idiag_states = rc->idiag_states;
 932         req.id = rc->id;
 933
 934         if (nlmsg_attrlen(cb->nlh, hdrlen))
 935                 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
 936
 937         return __inet_diag_dump(skb, cb, &req, bc);
 938 }
 939
 940 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
 941                                const struct nlmsghdr *nlh)
 942 {
 943         struct inet_diag_req_compat *rc = NLMSG_DATA(nlh);
 944         struct inet_diag_req req;
 945
 946         req.sdiag_family = rc->idiag_family;
 947         req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
 948         req.idiag_ext = rc->idiag_ext;
 949         req.idiag_states = rc->idiag_states;
 950         req.id = rc->id;
 951
 952         return inet_diag_get_exact(in_skb, nlh, &req);
 953 }
 954
 955 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
 956 {
 957         int hdrlen = sizeof(struct inet_diag_req_compat);
 958
 959         if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
 960             nlmsg_len(nlh) < hdrlen)
 961                 return -EINVAL;
 962
 963         if (nlh->nlmsg_flags & NLM_F_DUMP) {
 964                 if (nlmsg_attrlen(nlh, hdrlen)) {
 965                         struct nlattr *attr;
 966
 967                         attr = nlmsg_find_attr(nlh, hdrlen,
 968                                                INET_DIAG_REQ_BYTECODE);
 969                         if (attr == NULL ||
 970                             nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
 971                             inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
 972                                 return -EINVAL;
 973                 }
 974
 975                 return netlink_dump_start(sock_diag_nlsk, skb, nlh,
 976                                           inet_diag_dump_compat, NULL, 0);
 977         }
 978
 979         return inet_diag_get_exact_compat(skb, nlh);
 980 }
 981
 982 static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
 983 {
 984         int hdrlen = sizeof(struct inet_diag_req);
 985
 986         if (nlmsg_len(h) < hdrlen)
 987                 return -EINVAL;
 988
 989         if (h->nlmsg_flags & NLM_F_DUMP) {
 990                 if (nlmsg_attrlen(h, hdrlen)) {
 991                         struct nlattr *attr;
 992                         attr = nlmsg_find_attr(h, hdrlen,
 993                                                INET_DIAG_REQ_BYTECODE);
 994                         if (attr == NULL ||
 995                             nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
 996                             inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
 997                                 return -EINVAL;
 998                 }
 999
1000                 return netlink_dump_start(sock_diag_nlsk, skb, h,
1001                                           inet_diag_dump, NULL, 0);
1002         }
1003
1004         return inet_diag_get_exact(skb, h, (struct inet_diag_req *)NLMSG_DATA(h));
1005 }
1006
1007 static struct sock_diag_handler inet_diag_handler = {
1008         .family = AF_INET,
1009         .dump = inet_diag_handler_dump,
1010 };
1011
1012 static struct sock_diag_handler inet6_diag_handler = {
1013         .family = AF_INET6,
1014         .dump = inet_diag_handler_dump,
1015 };
1016
1017 int inet_diag_register(const struct inet_diag_handler *h)
1018 {
1019         const __u16 type = h->idiag_type;
1020         int err = -EINVAL;
1021
1022         if (type >= IPPROTO_MAX)
1023                 goto out;
1024
1025         mutex_lock(&inet_diag_table_mutex);
1026         err = -EEXIST;
1027         if (inet_diag_table[type] == NULL) {
1028                 inet_diag_table[type] = h;
1029                 err = 0;
1030         }
1031         mutex_unlock(&inet_diag_table_mutex);
1032 out:
1033         return err;
1034 }
1035 EXPORT_SYMBOL_GPL(inet_diag_register);
1036
1037 void inet_diag_unregister(const struct inet_diag_handler *h)
1038 {
1039         const __u16 type = h->idiag_type;
1040
1041         if (type >= IPPROTO_MAX)
1042                 return;
1043
1044         mutex_lock(&inet_diag_table_mutex);
1045         inet_diag_table[type] = NULL;
1046         mutex_unlock(&inet_diag_table_mutex);
1047 }
1048 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1049
1050 static int __init inet_diag_init(void)
1051 {
1052         const int inet_diag_table_size = (IPPROTO_MAX *
1053                                           sizeof(struct inet_diag_handler *));
1054         int err = -ENOMEM;
1055
1056         inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1057         if (!inet_diag_table)
1058                 goto out;
1059
1060         err = sock_diag_register(&inet_diag_handler);
1061         if (err)
1062                 goto out_free_nl;
1063
1064         err = sock_diag_register(&inet6_diag_handler);
1065         if (err)
1066                 goto out_free_inet;
1067
1068         sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1069 out:
1070         return err;
1071
1072 out_free_inet:
1073         sock_diag_unregister(&inet_diag_handler);
1074 out_free_nl:
1075         kfree(inet_diag_table);
1076         goto out;
1077 }
1078
1079 static void __exit inet_diag_exit(void)
1080 {
1081         sock_diag_unregister(&inet6_diag_handler);
1082         sock_diag_unregister(&inet_diag_handler);
1083         sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1084         kfree(inet_diag_table);
1085 }
1086
1087 module_init(inet_diag_init);
1088 module_exit(inet_diag_exit);
1089 MODULE_LICENSE("GPL");
1090 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 0);