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