Pileus Git - ~andy/linux/blob - 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 #if IS_ENABLED(CONFIG_IPV6)
  48         struct in6_addr saddr_storage;  /* for IPv4-mapped-IPv6 addresses */
  49         struct in6_addr daddr_storage;  /* for IPv4-mapped-IPv6 addresses */
  50 #endif
  51 };
  52
  53 static DEFINE_MUTEX(inet_diag_table_mutex);
  54
  55 static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
  56 {
  57         if (!inet_diag_table[proto])
  58                 request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
  59                                NETLINK_SOCK_DIAG, AF_INET, proto);
  60
  61         mutex_lock(&inet_diag_table_mutex);
  62         if (!inet_diag_table[proto])
  63                 return ERR_PTR(-ENOENT);
  64
  65         return inet_diag_table[proto];
  66 }
  67
  68 static inline void inet_diag_unlock_handler(
  69         const struct inet_diag_handler *handler)
  70 {
  71         mutex_unlock(&inet_diag_table_mutex);
  72 }
  73
  74 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
  75                               struct sk_buff *skb, struct inet_diag_req_v2 *req,
  76                               struct user_namespace *user_ns,
  77                               u32 portid, u32 seq, u16 nlmsg_flags,
  78                               const struct nlmsghdr *unlh)
  79 {
  80         const struct inet_sock *inet = inet_sk(sk);
  81         struct inet_diag_msg *r;
  82         struct nlmsghdr  *nlh;
  83         struct nlattr *attr;
  84         void *info = NULL;
  85         const struct inet_diag_handler *handler;
  86         int ext = req->idiag_ext;
  87
  88         handler = inet_diag_table[req->sdiag_protocol];
  89         BUG_ON(handler == NULL);
  90
  91         nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
  92                         nlmsg_flags);
  93         if (!nlh)
  94                 return -EMSGSIZE;
  95
  96         r = nlmsg_data(nlh);
  97         BUG_ON(sk->sk_state == TCP_TIME_WAIT);
  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         sock_diag_save_cookie(sk, r->id.idiag_cookie);
 106
 107         r->id.idiag_sport = inet->inet_sport;
 108         r->id.idiag_dport = inet->inet_dport;
 109         r->id.idiag_src[0] = inet->inet_rcv_saddr;
 110         r->id.idiag_dst[0] = inet->inet_daddr;
 111
 112         if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
 113                 goto errout;
 114
 115         /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
 116          * hence this needs to be included regardless of socket family.
 117          */
 118         if (ext & (1 << (INET_DIAG_TOS - 1)))
 119                 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
 120                         goto errout;
 121
 122 #if IS_ENABLED(CONFIG_IPV6)
 123         if (r->idiag_family == AF_INET6) {
 124                 const struct ipv6_pinfo *np = inet6_sk(sk);
 125
 126                 *(struct in6_addr *)r->id.idiag_src = np->rcv_saddr;
 127                 *(struct in6_addr *)r->id.idiag_dst = np->daddr;
 128
 129                 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
 130                         if (nla_put_u8(skb, INET_DIAG_TCLASS, np->tclass) < 0)
 131                                 goto errout;
 132         }
 133 #endif
 134
 135         r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
 136         r->idiag_inode = sock_i_ino(sk);
 137
 138         if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
 139                 struct inet_diag_meminfo minfo = {
 140                         .idiag_rmem = sk_rmem_alloc_get(sk),
 141                         .idiag_wmem = sk->sk_wmem_queued,
 142                         .idiag_fmem = sk->sk_forward_alloc,
 143                         .idiag_tmem = sk_wmem_alloc_get(sk),
 144                 };
 145
 146                 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
 147                         goto errout;
 148         }
 149
 150         if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
 151                 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
 152                         goto errout;
 153
 154         if (icsk == NULL) {
 155                 handler->idiag_get_info(sk, r, NULL);
 156                 goto out;
 157         }
 158
 159 #define EXPIRES_IN_MS(tmo)  DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
 160
 161         if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
 162             icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
 163             icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
 164                 r->idiag_timer = 1;
 165                 r->idiag_retrans = icsk->icsk_retransmits;
 166                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
 167         } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
 168                 r->idiag_timer = 4;
 169                 r->idiag_retrans = icsk->icsk_probes_out;
 170                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
 171         } else if (timer_pending(&sk->sk_timer)) {
 172                 r->idiag_timer = 2;
 173                 r->idiag_retrans = icsk->icsk_probes_out;
 174                 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
 175         } else {
 176                 r->idiag_timer = 0;
 177                 r->idiag_expires = 0;
 178         }
 179 #undef EXPIRES_IN_MS
 180
 181         if (ext & (1 << (INET_DIAG_INFO - 1))) {
 182                 attr = nla_reserve(skb, INET_DIAG_INFO,
 183                                    sizeof(struct tcp_info));
 184                 if (!attr)
 185                         goto errout;
 186
 187                 info = nla_data(attr);
 188         }
 189
 190         if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops)
 191                 if (nla_put_string(skb, INET_DIAG_CONG,
 192                                    icsk->icsk_ca_ops->name) < 0)
 193                         goto errout;
 194
 195         handler->idiag_get_info(sk, r, info);
 196
 197         if (sk->sk_state < TCP_TIME_WAIT &&
 198             icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
 199                 icsk->icsk_ca_ops->get_info(sk, ext, skb);
 200
 201 out:
 202         return nlmsg_end(skb, nlh);
 203
 204 errout:
 205         nlmsg_cancel(skb, nlh);
 206         return -EMSGSIZE;
 207 }
 208 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
 209
 210 static int inet_csk_diag_fill(struct sock *sk,
 211                               struct sk_buff *skb, struct inet_diag_req_v2 *req,
 212                               struct user_namespace *user_ns,
 213                               u32 portid, u32 seq, u16 nlmsg_flags,
 214                               const struct nlmsghdr *unlh)
 215 {
 216         return inet_sk_diag_fill(sk, inet_csk(sk),
 217                         skb, req, user_ns, portid, seq, nlmsg_flags, unlh);
 218 }
 219
 220 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
 221                                struct sk_buff *skb, struct inet_diag_req_v2 *req,
 222                                u32 portid, u32 seq, u16 nlmsg_flags,
 223                                const struct nlmsghdr *unlh)
 224 {
 225         s32 tmo;
 226         struct inet_diag_msg *r;
 227         struct nlmsghdr *nlh;
 228
 229         nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
 230                         nlmsg_flags);
 231         if (!nlh)
 232                 return -EMSGSIZE;
 233
 234         r = nlmsg_data(nlh);
 235         BUG_ON(tw->tw_state != TCP_TIME_WAIT);
 236
 237         tmo = tw->tw_ttd - inet_tw_time_stamp();
 238         if (tmo < 0)
 239                 tmo = 0;
 240
 241         r->idiag_family       = tw->tw_family;
 242         r->idiag_retrans      = 0;
 243         r->id.idiag_if        = tw->tw_bound_dev_if;
 244         sock_diag_save_cookie(tw, r->id.idiag_cookie);
 245         r->id.idiag_sport     = tw->tw_sport;
 246         r->id.idiag_dport     = tw->tw_dport;
 247         r->id.idiag_src[0]    = tw->tw_rcv_saddr;
 248         r->id.idiag_dst[0]    = tw->tw_daddr;
 249         r->idiag_state        = tw->tw_substate;
 250         r->idiag_timer        = 3;
 251         r->idiag_expires      = jiffies_to_msecs(tmo);
 252         r->idiag_rqueue       = 0;
 253         r->idiag_wqueue       = 0;
 254         r->idiag_uid          = 0;
 255         r->idiag_inode        = 0;
 256 #if IS_ENABLED(CONFIG_IPV6)
 257         if (tw->tw_family == AF_INET6) {
 258                 const struct inet6_timewait_sock *tw6 =
 259                                                 inet6_twsk((struct sock *)tw);
 260
 261                 *(struct in6_addr *)r->id.idiag_src = tw6->tw_v6_rcv_saddr;
 262                 *(struct in6_addr *)r->id.idiag_dst = tw6->tw_v6_daddr;
 263         }
 264 #endif
 265
 266         return nlmsg_end(skb, nlh);
 267 }
 268
 269 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
 270                         struct inet_diag_req_v2 *r,
 271                         struct user_namespace *user_ns,
 272                         u32 portid, u32 seq, u16 nlmsg_flags,
 273                         const struct nlmsghdr *unlh)
 274 {
 275         if (sk->sk_state == TCP_TIME_WAIT)
 276                 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
 277                                            skb, r, portid, seq, nlmsg_flags,
 278                                            unlh);
 279         return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq, nlmsg_flags, unlh);
 280 }
 281
 282 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_skb,
 283                 const struct nlmsghdr *nlh, struct inet_diag_req_v2 *req)
 284 {
 285         int err;
 286         struct sock *sk;
 287         struct sk_buff *rep;
 288         struct net *net = sock_net(in_skb->sk);
 289
 290         err = -EINVAL;
 291         if (req->sdiag_family == AF_INET) {
 292                 sk = inet_lookup(net, hashinfo, req->id.idiag_dst[0],
 293                                  req->id.idiag_dport, req->id.idiag_src[0],
 294                                  req->id.idiag_sport, req->id.idiag_if);
 295         }
 296 #if IS_ENABLED(CONFIG_IPV6)
 297         else if (req->sdiag_family == AF_INET6) {
 298                 sk = inet6_lookup(net, hashinfo,
 299                                   (struct in6_addr *)req->id.idiag_dst,
 300                                   req->id.idiag_dport,
 301                                   (struct in6_addr *)req->id.idiag_src,
 302                                   req->id.idiag_sport,
 303                                   req->id.idiag_if);
 304         }
 305 #endif
 306         else {
 307                 goto out_nosk;
 308         }
 309
 310         err = -ENOENT;
 311         if (sk == NULL)
 312                 goto out_nosk;
 313
 314         err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
 315         if (err)
 316                 goto out;
 317
 318         rep = nlmsg_new(sizeof(struct inet_diag_msg) +
 319                         sizeof(struct inet_diag_meminfo) +
 320                         sizeof(struct tcp_info) + 64, GFP_KERNEL);
 321         if (!rep) {
 322                 err = -ENOMEM;
 323                 goto out;
 324         }
 325
 326         err = sk_diag_fill(sk, rep, req,
 327                            sk_user_ns(NETLINK_CB(in_skb).sk),
 328                            NETLINK_CB(in_skb).portid,
 329                            nlh->nlmsg_seq, 0, nlh);
 330         if (err < 0) {
 331                 WARN_ON(err == -EMSGSIZE);
 332                 nlmsg_free(rep);
 333                 goto out;
 334         }
 335         err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
 336                               MSG_DONTWAIT);
 337         if (err > 0)
 338                 err = 0;
 339
 340 out:
 341         if (sk) {
 342                 if (sk->sk_state == TCP_TIME_WAIT)
 343                         inet_twsk_put((struct inet_timewait_sock *)sk);
 344                 else
 345                         sock_put(sk);
 346         }
 347 out_nosk:
 348         return err;
 349 }
 350 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
 351
 352 static int inet_diag_get_exact(struct sk_buff *in_skb,
 353                                const struct nlmsghdr *nlh,
 354                                struct inet_diag_req_v2 *req)
 355 {
 356         const struct inet_diag_handler *handler;
 357         int err;
 358
 359         handler = inet_diag_lock_handler(req->sdiag_protocol);
 360         if (IS_ERR(handler))
 361                 err = PTR_ERR(handler);
 362         else
 363                 err = handler->dump_one(in_skb, nlh, req);
 364         inet_diag_unlock_handler(handler);
 365
 366         return err;
 367 }
 368
 369 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
 370 {
 371         int words = bits >> 5;
 372
 373         bits &= 0x1f;
 374
 375         if (words) {
 376                 if (memcmp(a1, a2, words << 2))
 377                         return 0;
 378         }
 379         if (bits) {
 380                 __be32 w1, w2;
 381                 __be32 mask;
 382
 383                 w1 = a1[words];
 384                 w2 = a2[words];
 385
 386                 mask = htonl((0xffffffff) << (32 - bits));
 387
 388                 if ((w1 ^ w2) & mask)
 389                         return 0;
 390         }
 391
 392         return 1;
 393 }
 394
 395
 396 static int inet_diag_bc_run(const struct nlattr *_bc,
 397                 const struct inet_diag_entry *entry)
 398 {
 399         const void *bc = nla_data(_bc);
 400         int len = nla_len(_bc);
 401
 402         while (len > 0) {
 403                 int yes = 1;
 404                 const struct inet_diag_bc_op *op = bc;
 405
 406                 switch (op->code) {
 407                 case INET_DIAG_BC_NOP:
 408                         break;
 409                 case INET_DIAG_BC_JMP:
 410                         yes = 0;
 411                         break;
 412                 case INET_DIAG_BC_S_GE:
 413                         yes = entry->sport >= op[1].no;
 414                         break;
 415                 case INET_DIAG_BC_S_LE:
 416                         yes = entry->sport <= op[1].no;
 417                         break;
 418                 case INET_DIAG_BC_D_GE:
 419                         yes = entry->dport >= op[1].no;
 420                         break;
 421                 case INET_DIAG_BC_D_LE:
 422                         yes = entry->dport <= op[1].no;
 423                         break;
 424                 case INET_DIAG_BC_AUTO:
 425                         yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
 426                         break;
 427                 case INET_DIAG_BC_S_COND:
 428                 case INET_DIAG_BC_D_COND: {
 429                         struct inet_diag_hostcond *cond;
 430                         __be32 *addr;
 431
 432                         cond = (struct inet_diag_hostcond *)(op + 1);
 433                         if (cond->port != -1 &&
 434                             cond->port != (op->code == INET_DIAG_BC_S_COND ?
 435                                              entry->sport : entry->dport)) {
 436                                 yes = 0;
 437                                 break;
 438                         }
 439
 440                         if (op->code == INET_DIAG_BC_S_COND)
 441                                 addr = entry->saddr;
 442                         else
 443                                 addr = entry->daddr;
 444
 445                         if (cond->family != AF_UNSPEC &&
 446                             cond->family != entry->family) {
 447                                 if (entry->family == AF_INET6 &&
 448                                     cond->family == AF_INET) {
 449                                         if (addr[0] == 0 && addr[1] == 0 &&
 450                                             addr[2] == htonl(0xffff) &&
 451                                             bitstring_match(addr + 3,
 452                                                             cond->addr,
 453                                                             cond->prefix_len))
 454                                                 break;
 455                                 }
 456                                 yes = 0;
 457                                 break;
 458                         }
 459
 460                         if (cond->prefix_len == 0)
 461                                 break;
 462                         if (bitstring_match(addr, cond->addr,
 463                                             cond->prefix_len))
 464                                 break;
 465                         yes = 0;
 466                         break;
 467                 }
 468                 }
 469
 470                 if (yes) {
 471                         len -= op->yes;
 472                         bc += op->yes;
 473                 } else {
 474                         len -= op->no;
 475                         bc += op->no;
 476                 }
 477         }
 478         return len == 0;
 479 }
 480
 481 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
 482 {
 483         struct inet_diag_entry entry;
 484         struct inet_sock *inet = inet_sk(sk);
 485
 486         if (bc == NULL)
 487                 return 1;
 488
 489         entry.family = sk->sk_family;
 490 #if IS_ENABLED(CONFIG_IPV6)
 491         if (entry.family == AF_INET6) {
 492                 struct ipv6_pinfo *np = inet6_sk(sk);
 493
 494                 entry.saddr = np->rcv_saddr.s6_addr32;
 495                 entry.daddr = np->daddr.s6_addr32;
 496         } else
 497 #endif
 498         {
 499                 entry.saddr = &inet->inet_rcv_saddr;
 500                 entry.daddr = &inet->inet_daddr;
 501         }
 502         entry.sport = inet->inet_num;
 503         entry.dport = ntohs(inet->inet_dport);
 504         entry.userlocks = sk->sk_userlocks;
 505
 506         return inet_diag_bc_run(bc, &entry);
 507 }
 508 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
 509
 510 static int valid_cc(const void *bc, int len, int cc)
 511 {
 512         while (len >= 0) {
 513                 const struct inet_diag_bc_op *op = bc;
 514
 515                 if (cc > len)
 516                         return 0;
 517                 if (cc == len)
 518                         return 1;
 519                 if (op->yes < 4 || op->yes & 3)
 520                         return 0;
 521                 len -= op->yes;
 522                 bc  += op->yes;
 523         }
 524         return 0;
 525 }
 526
 527 /* Validate an inet_diag_hostcond. */
 528 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
 529                            int *min_len)
 530 {
 531         int addr_len;
 532         struct inet_diag_hostcond *cond;
 533
 534         /* Check hostcond space. */
 535         *min_len += sizeof(struct inet_diag_hostcond);
 536         if (len < *min_len)
 537                 return false;
 538         cond = (struct inet_diag_hostcond *)(op + 1);
 539
 540         /* Check address family and address length. */
 541         switch (cond->family) {
 542         case AF_UNSPEC:
 543                 addr_len = 0;
 544                 break;
 545         case AF_INET:
 546                 addr_len = sizeof(struct in_addr);
 547                 break;
 548         case AF_INET6:
 549                 addr_len = sizeof(struct in6_addr);
 550                 break;
 551         default:
 552                 return false;
 553         }
 554         *min_len += addr_len;
 555         if (len < *min_len)
 556                 return false;
 557
 558         /* Check prefix length (in bits) vs address length (in bytes). */
 559         if (cond->prefix_len > 8 * addr_len)
 560                 return false;
 561
 562         return true;
 563 }
 564
 565 /* Validate a port comparison operator. */
 566 static inline bool valid_port_comparison(const struct inet_diag_bc_op *op,
 567                                          int len, int *min_len)
 568 {
 569         /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
 570         *min_len += sizeof(struct inet_diag_bc_op);
 571         if (len < *min_len)
 572                 return false;
 573         return true;
 574 }
 575
 576 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
 577 {
 578         const void *bc = bytecode;
 579         int  len = bytecode_len;
 580
 581         while (len > 0) {
 582                 const struct inet_diag_bc_op *op = bc;
 583                 int min_len = sizeof(struct inet_diag_bc_op);
 584
 585 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
 586                 switch (op->code) {
 587                 case INET_DIAG_BC_S_COND:
 588                 case INET_DIAG_BC_D_COND:
 589                         if (!valid_hostcond(bc, len, &min_len))
 590                                 return -EINVAL;
 591                         break;
 592                 case INET_DIAG_BC_S_GE:
 593                 case INET_DIAG_BC_S_LE:
 594                 case INET_DIAG_BC_D_GE:
 595                 case INET_DIAG_BC_D_LE:
 596                         if (!valid_port_comparison(bc, len, &min_len))
 597                                 return -EINVAL;
 598                         break;
 599                 case INET_DIAG_BC_AUTO:
 600                 case INET_DIAG_BC_JMP:
 601                 case INET_DIAG_BC_NOP:
 602                         break;
 603                 default:
 604                         return -EINVAL;
 605                 }
 606
 607                 if (op->code != INET_DIAG_BC_NOP) {
 608                         if (op->no < min_len || op->no > len + 4 || op->no & 3)
 609                                 return -EINVAL;
 610                         if (op->no < len &&
 611                             !valid_cc(bytecode, bytecode_len, len - op->no))
 612                                 return -EINVAL;
 613                 }
 614
 615                 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
 616                         return -EINVAL;
 617                 bc  += op->yes;
 618                 len -= op->yes;
 619         }
 620         return len == 0 ? 0 : -EINVAL;
 621 }
 622
 623 static int inet_csk_diag_dump(struct sock *sk,
 624                               struct sk_buff *skb,
 625                               struct netlink_callback *cb,
 626                               struct inet_diag_req_v2 *r,
 627                               const struct nlattr *bc)
 628 {
 629         if (!inet_diag_bc_sk(bc, sk))
 630                 return 0;
 631
 632         return inet_csk_diag_fill(sk, skb, r,
 633                                   sk_user_ns(NETLINK_CB(cb->skb).sk),
 634                                   NETLINK_CB(cb->skb).portid,
 635                                   cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
 636 }
 637
 638 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
 639                                struct sk_buff *skb,
 640                                struct netlink_callback *cb,
 641                                struct inet_diag_req_v2 *r,
 642                                const struct nlattr *bc)
 643 {
 644         if (bc != NULL) {
 645                 struct inet_diag_entry entry;
 646
 647                 entry.family = tw->tw_family;
 648 #if IS_ENABLED(CONFIG_IPV6)
 649                 if (tw->tw_family == AF_INET6) {
 650                         struct inet6_timewait_sock *tw6 =
 651                                                 inet6_twsk((struct sock *)tw);
 652                         entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
 653                         entry.daddr = tw6->tw_v6_daddr.s6_addr32;
 654                 } else
 655 #endif
 656                 {
 657                         entry.saddr = &tw->tw_rcv_saddr;
 658                         entry.daddr = &tw->tw_daddr;
 659                 }
 660                 entry.sport = tw->tw_num;
 661                 entry.dport = ntohs(tw->tw_dport);
 662                 entry.userlocks = 0;
 663
 664                 if (!inet_diag_bc_run(bc, &entry))
 665                         return 0;
 666         }
 667
 668         return inet_twsk_diag_fill(tw, skb, r,
 669                                    NETLINK_CB(cb->skb).portid,
 670                                    cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
 671 }
 672
 673 /* Get the IPv4, IPv6, or IPv4-mapped-IPv6 local and remote addresses
 674  * from a request_sock. For IPv4-mapped-IPv6 we must map IPv4 to IPv6.
 675  */
 676 static inline void inet_diag_req_addrs(const struct sock *sk,
 677                                        const struct request_sock *req,
 678                                        struct inet_diag_entry *entry)
 679 {
 680         struct inet_request_sock *ireq = inet_rsk(req);
 681
 682 #if IS_ENABLED(CONFIG_IPV6)
 683         if (sk->sk_family == AF_INET6) {
 684                 if (req->rsk_ops->family == AF_INET6) {
 685                         entry->saddr = inet6_rsk(req)->loc_addr.s6_addr32;
 686                         entry->daddr = inet6_rsk(req)->rmt_addr.s6_addr32;
 687                 } else if (req->rsk_ops->family == AF_INET) {
 688                         ipv6_addr_set_v4mapped(ireq->loc_addr,
 689                                                &entry->saddr_storage);
 690                         ipv6_addr_set_v4mapped(ireq->rmt_addr,
 691                                                &entry->daddr_storage);
 692                         entry->saddr = entry->saddr_storage.s6_addr32;
 693                         entry->daddr = entry->daddr_storage.s6_addr32;
 694                 }
 695         } else
 696 #endif
 697         {
 698                 entry->saddr = &ireq->loc_addr;
 699                 entry->daddr = &ireq->rmt_addr;
 700         }
 701 }
 702
 703 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
 704                               struct request_sock *req,
 705                               struct user_namespace *user_ns,
 706                               u32 portid, u32 seq,
 707                               const struct nlmsghdr *unlh)
 708 {
 709         const struct inet_request_sock *ireq = inet_rsk(req);
 710         struct inet_sock *inet = inet_sk(sk);
 711         struct inet_diag_msg *r;
 712         struct nlmsghdr *nlh;
 713         long tmo;
 714
 715         nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
 716                         NLM_F_MULTI);
 717         if (!nlh)
 718                 return -EMSGSIZE;
 719
 720         r = nlmsg_data(nlh);
 721         r->idiag_family = sk->sk_family;
 722         r->idiag_state = TCP_SYN_RECV;
 723         r->idiag_timer = 1;
 724         r->idiag_retrans = req->num_retrans;
 725
 726         r->id.idiag_if = sk->sk_bound_dev_if;
 727         sock_diag_save_cookie(req, r->id.idiag_cookie);
 728
 729         tmo = req->expires - jiffies;
 730         if (tmo < 0)
 731                 tmo = 0;
 732
 733         r->id.idiag_sport = inet->inet_sport;
 734         r->id.idiag_dport = ireq->rmt_port;
 735         r->id.idiag_src[0] = ireq->loc_addr;
 736         r->id.idiag_dst[0] = ireq->rmt_addr;
 737         r->idiag_expires = jiffies_to_msecs(tmo);
 738         r->idiag_rqueue = 0;
 739         r->idiag_wqueue = 0;
 740         r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
 741         r->idiag_inode = 0;
 742 #if IS_ENABLED(CONFIG_IPV6)
 743         if (r->idiag_family == AF_INET6) {
 744                 struct inet_diag_entry entry;
 745                 inet_diag_req_addrs(sk, req, &entry);
 746                 memcpy(r->id.idiag_src, entry.saddr, sizeof(struct in6_addr));
 747                 memcpy(r->id.idiag_dst, entry.daddr, sizeof(struct in6_addr));
 748         }
 749 #endif
 750
 751         return nlmsg_end(skb, nlh);
 752 }
 753
 754 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
 755                                struct netlink_callback *cb,
 756                                struct inet_diag_req_v2 *r,
 757                                const struct nlattr *bc)
 758 {
 759         struct inet_diag_entry entry;
 760         struct inet_connection_sock *icsk = inet_csk(sk);
 761         struct listen_sock *lopt;
 762         struct inet_sock *inet = inet_sk(sk);
 763         int j, s_j;
 764         int reqnum, s_reqnum;
 765         int err = 0;
 766
 767         s_j = cb->args[3];
 768         s_reqnum = cb->args[4];
 769
 770         if (s_j > 0)
 771                 s_j--;
 772
 773         entry.family = sk->sk_family;
 774
 775         read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 776
 777         lopt = icsk->icsk_accept_queue.listen_opt;
 778         if (!lopt || !lopt->qlen)
 779                 goto out;
 780
 781         if (bc != NULL) {
 782                 entry.sport = inet->inet_num;
 783                 entry.userlocks = sk->sk_userlocks;
 784         }
 785
 786         for (j = s_j; j < lopt->nr_table_entries; j++) {
 787                 struct request_sock *req, *head = lopt->syn_table[j];
 788
 789                 reqnum = 0;
 790                 for (req = head; req; reqnum++, req = req->dl_next) {
 791                         struct inet_request_sock *ireq = inet_rsk(req);
 792
 793                         if (reqnum < s_reqnum)
 794                                 continue;
 795                         if (r->id.idiag_dport != ireq->rmt_port &&
 796                             r->id.idiag_dport)
 797                                 continue;
 798
 799                         if (bc) {
 800                                 inet_diag_req_addrs(sk, req, &entry);
 801                                 entry.dport = ntohs(ireq->rmt_port);
 802
 803                                 if (!inet_diag_bc_run(bc, &entry))
 804                                         continue;
 805                         }
 806
 807                         err = inet_diag_fill_req(skb, sk, req,
 808                                                sk_user_ns(NETLINK_CB(cb->skb).sk),
 809                                                NETLINK_CB(cb->skb).portid,
 810                                                cb->nlh->nlmsg_seq, cb->nlh);
 811                         if (err < 0) {
 812                                 cb->args[3] = j + 1;
 813                                 cb->args[4] = reqnum;
 814                                 goto out;
 815                         }
 816                 }
 817
 818                 s_reqnum = 0;
 819         }
 820
 821 out:
 822         read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 823
 824         return err;
 825 }
 826
 827 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
 828                 struct netlink_callback *cb, struct inet_diag_req_v2 *r, struct nlattr *bc)
 829 {
 830         int i, num;
 831         int s_i, s_num;
 832         struct net *net = sock_net(skb->sk);
 833
 834         s_i = cb->args[1];
 835         s_num = num = cb->args[2];
 836
 837         if (cb->args[0] == 0) {
 838                 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
 839                         goto skip_listen_ht;
 840
 841                 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
 842                         struct sock *sk;
 843                         struct hlist_nulls_node *node;
 844                         struct inet_listen_hashbucket *ilb;
 845
 846                         num = 0;
 847                         ilb = &hashinfo->listening_hash[i];
 848                         spin_lock_bh(&ilb->lock);
 849                         sk_nulls_for_each(sk, node, &ilb->head) {
 850                                 struct inet_sock *inet = inet_sk(sk);
 851
 852                                 if (!net_eq(sock_net(sk), net))
 853                                         continue;
 854
 855                                 if (num < s_num) {
 856                                         num++;
 857                                         continue;
 858                                 }
 859
 860                                 if (r->sdiag_family != AF_UNSPEC &&
 861                                                 sk->sk_family != r->sdiag_family)
 862                                         goto next_listen;
 863
 864                                 if (r->id.idiag_sport != inet->inet_sport &&
 865                                     r->id.idiag_sport)
 866                                         goto next_listen;
 867
 868                                 if (!(r->idiag_states & TCPF_LISTEN) ||
 869                                     r->id.idiag_dport ||
 870                                     cb->args[3] > 0)
 871                                         goto syn_recv;
 872
 873                                 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
 874                                         spin_unlock_bh(&ilb->lock);
 875                                         goto done;
 876                                 }
 877
 878 syn_recv:
 879                                 if (!(r->idiag_states & TCPF_SYN_RECV))
 880                                         goto next_listen;
 881
 882                                 if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) {
 883                                         spin_unlock_bh(&ilb->lock);
 884                                         goto done;
 885                                 }
 886
 887 next_listen:
 888                                 cb->args[3] = 0;
 889                                 cb->args[4] = 0;
 890                                 ++num;
 891                         }
 892                         spin_unlock_bh(&ilb->lock);
 893
 894                         s_num = 0;
 895                         cb->args[3] = 0;
 896                         cb->args[4] = 0;
 897                 }
 898 skip_listen_ht:
 899                 cb->args[0] = 1;
 900                 s_i = num = s_num = 0;
 901         }
 902
 903         if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
 904                 goto out;
 905
 906         for (i = s_i; i <= hashinfo->ehash_mask; i++) {
 907                 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
 908                 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
 909                 struct sock *sk;
 910                 struct hlist_nulls_node *node;
 911
 912                 num = 0;
 913
 914                 if (hlist_nulls_empty(&head->chain) &&
 915                         hlist_nulls_empty(&head->twchain))
 916                         continue;
 917
 918                 if (i > s_i)
 919                         s_num = 0;
 920
 921                 spin_lock_bh(lock);
 922                 sk_nulls_for_each(sk, node, &head->chain) {
 923                         struct inet_sock *inet = inet_sk(sk);
 924
 925                         if (!net_eq(sock_net(sk), net))
 926                                 continue;
 927                         if (num < s_num)
 928                                 goto next_normal;
 929                         if (!(r->idiag_states & (1 << sk->sk_state)))
 930                                 goto next_normal;
 931                         if (r->sdiag_family != AF_UNSPEC &&
 932                                         sk->sk_family != r->sdiag_family)
 933                                 goto next_normal;
 934                         if (r->id.idiag_sport != inet->inet_sport &&
 935                             r->id.idiag_sport)
 936                                 goto next_normal;
 937                         if (r->id.idiag_dport != inet->inet_dport &&
 938                             r->id.idiag_dport)
 939                                 goto next_normal;
 940                         if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
 941                                 spin_unlock_bh(lock);
 942                                 goto done;
 943                         }
 944 next_normal:
 945                         ++num;
 946                 }
 947
 948                 if (r->idiag_states & TCPF_TIME_WAIT) {
 949                         struct inet_timewait_sock *tw;
 950
 951                         inet_twsk_for_each(tw, node,
 952                                     &head->twchain) {
 953                                 if (!net_eq(twsk_net(tw), net))
 954                                         continue;
 955
 956                                 if (num < s_num)
 957                                         goto next_dying;
 958                                 if (r->sdiag_family != AF_UNSPEC &&
 959                                                 tw->tw_family != r->sdiag_family)
 960                                         goto next_dying;
 961                                 if (r->id.idiag_sport != tw->tw_sport &&
 962                                     r->id.idiag_sport)
 963                                         goto next_dying;
 964                                 if (r->id.idiag_dport != tw->tw_dport &&
 965                                     r->id.idiag_dport)
 966                                         goto next_dying;
 967                                 if (inet_twsk_diag_dump(tw, skb, cb, r, bc) < 0) {
 968                                         spin_unlock_bh(lock);
 969                                         goto done;
 970                                 }
 971 next_dying:
 972                                 ++num;
 973                         }
 974                 }
 975                 spin_unlock_bh(lock);
 976         }
 977
 978 done:
 979         cb->args[1] = i;
 980         cb->args[2] = num;
 981 out:
 982         ;
 983 }
 984 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
 985
 986 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
 987                 struct inet_diag_req_v2 *r, struct nlattr *bc)
 988 {
 989         const struct inet_diag_handler *handler;
 990         int err = 0;
 991
 992         handler = inet_diag_lock_handler(r->sdiag_protocol);
 993         if (!IS_ERR(handler))
 994                 handler->dump(skb, cb, r, bc);
 995         else
 996                 err = PTR_ERR(handler);
 997         inet_diag_unlock_handler(handler);
 998
 999         return err ? : skb->len;
1000 }
1001
1002 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
1003 {
1004         struct nlattr *bc = NULL;
1005         int hdrlen = sizeof(struct inet_diag_req_v2);
1006
1007         if (nlmsg_attrlen(cb->nlh, hdrlen))
1008                 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1009
1010         return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
1011 }
1012
1013 static inline int inet_diag_type2proto(int type)
1014 {
1015         switch (type) {
1016         case TCPDIAG_GETSOCK:
1017                 return IPPROTO_TCP;
1018         case DCCPDIAG_GETSOCK:
1019                 return IPPROTO_DCCP;
1020         default:
1021                 return 0;
1022         }
1023 }
1024
1025 static int inet_diag_dump_compat(struct sk_buff *skb, struct netlink_callback *cb)
1026 {
1027         struct inet_diag_req *rc = nlmsg_data(cb->nlh);
1028         struct inet_diag_req_v2 req;
1029         struct nlattr *bc = NULL;
1030         int hdrlen = sizeof(struct inet_diag_req);
1031
1032         req.sdiag_family = AF_UNSPEC; /* compatibility */
1033         req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1034         req.idiag_ext = rc->idiag_ext;
1035         req.idiag_states = rc->idiag_states;
1036         req.id = rc->id;
1037
1038         if (nlmsg_attrlen(cb->nlh, hdrlen))
1039                 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1040
1041         return __inet_diag_dump(skb, cb, &req, bc);
1042 }
1043
1044 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1045                                const struct nlmsghdr *nlh)
1046 {
1047         struct inet_diag_req *rc = nlmsg_data(nlh);
1048         struct inet_diag_req_v2 req;
1049
1050         req.sdiag_family = rc->idiag_family;
1051         req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1052         req.idiag_ext = rc->idiag_ext;
1053         req.idiag_states = rc->idiag_states;
1054         req.id = rc->id;
1055
1056         return inet_diag_get_exact(in_skb, nlh, &req);
1057 }
1058
1059 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1060 {
1061         int hdrlen = sizeof(struct inet_diag_req);
1062         struct net *net = sock_net(skb->sk);
1063
1064         if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1065             nlmsg_len(nlh) < hdrlen)
1066                 return -EINVAL;
1067
1068         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1069                 if (nlmsg_attrlen(nlh, hdrlen)) {
1070                         struct nlattr *attr;
1071
1072                         attr = nlmsg_find_attr(nlh, hdrlen,
1073                                                INET_DIAG_REQ_BYTECODE);
1074                         if (attr == NULL ||
1075                             nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1076                             inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1077                                 return -EINVAL;
1078                 }
1079                 {
1080                         struct netlink_dump_control c = {
1081                                 .dump = inet_diag_dump_compat,
1082                         };
1083                         return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1084                 }
1085         }
1086
1087         return inet_diag_get_exact_compat(skb, nlh);
1088 }
1089
1090 static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
1091 {
1092         int hdrlen = sizeof(struct inet_diag_req_v2);
1093         struct net *net = sock_net(skb->sk);
1094
1095         if (nlmsg_len(h) < hdrlen)
1096                 return -EINVAL;
1097
1098         if (h->nlmsg_flags & NLM_F_DUMP) {
1099                 if (nlmsg_attrlen(h, hdrlen)) {
1100                         struct nlattr *attr;
1101                         attr = nlmsg_find_attr(h, hdrlen,
1102                                                INET_DIAG_REQ_BYTECODE);
1103                         if (attr == NULL ||
1104                             nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1105                             inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1106                                 return -EINVAL;
1107                 }
1108                 {
1109                         struct netlink_dump_control c = {
1110                                 .dump = inet_diag_dump,
1111                         };
1112                         return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1113                 }
1114         }
1115
1116         return inet_diag_get_exact(skb, h, nlmsg_data(h));
1117 }
1118
1119 static const struct sock_diag_handler inet_diag_handler = {
1120         .family = AF_INET,
1121         .dump = inet_diag_handler_dump,
1122 };
1123
1124 static const struct sock_diag_handler inet6_diag_handler = {
1125         .family = AF_INET6,
1126         .dump = inet_diag_handler_dump,
1127 };
1128
1129 int inet_diag_register(const struct inet_diag_handler *h)
1130 {
1131         const __u16 type = h->idiag_type;
1132         int err = -EINVAL;
1133
1134         if (type >= IPPROTO_MAX)
1135                 goto out;
1136
1137         mutex_lock(&inet_diag_table_mutex);
1138         err = -EEXIST;
1139         if (inet_diag_table[type] == NULL) {
1140                 inet_diag_table[type] = h;
1141                 err = 0;
1142         }
1143         mutex_unlock(&inet_diag_table_mutex);
1144 out:
1145         return err;
1146 }
1147 EXPORT_SYMBOL_GPL(inet_diag_register);
1148
1149 void inet_diag_unregister(const struct inet_diag_handler *h)
1150 {
1151         const __u16 type = h->idiag_type;
1152
1153         if (type >= IPPROTO_MAX)
1154                 return;
1155
1156         mutex_lock(&inet_diag_table_mutex);
1157         inet_diag_table[type] = NULL;
1158         mutex_unlock(&inet_diag_table_mutex);
1159 }
1160 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1161
1162 static int __init inet_diag_init(void)
1163 {
1164         const int inet_diag_table_size = (IPPROTO_MAX *
1165                                           sizeof(struct inet_diag_handler *));
1166         int err = -ENOMEM;
1167
1168         inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1169         if (!inet_diag_table)
1170                 goto out;
1171
1172         err = sock_diag_register(&inet_diag_handler);
1173         if (err)
1174                 goto out_free_nl;
1175
1176         err = sock_diag_register(&inet6_diag_handler);
1177         if (err)
1178                 goto out_free_inet;
1179
1180         sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1181 out:
1182         return err;
1183
1184 out_free_inet:
1185         sock_diag_unregister(&inet_diag_handler);
1186 out_free_nl:
1187         kfree(inet_diag_table);
1188         goto out;
1189 }
1190
1191 static void __exit inet_diag_exit(void)
1192 {
1193         sock_diag_unregister(&inet6_diag_handler);
1194         sock_diag_unregister(&inet_diag_handler);
1195         sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1196         kfree(inet_diag_table);
1197 }
1198
1199 module_init(inet_diag_init);
1200 module_exit(inet_diag_exit);
1201 MODULE_LICENSE("GPL");
1202 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1203 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);