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 const __be32 *saddr; 42 const __be32 *daddr; 43 u16 sport; 44 u16 dport; 45 u16 family; 46 u16 userlocks; 47 u32 ifindex; 48 }; 49 50 static DEFINE_MUTEX(inet_diag_table_mutex); 51 52 static const struct inet_diag_handler *inet_diag_lock_handler(int proto) 53 { 54 if (!inet_diag_table[proto]) 55 request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK, 56 NETLINK_SOCK_DIAG, AF_INET, proto); 57 58 mutex_lock(&inet_diag_table_mutex); 59 if (!inet_diag_table[proto]) 60 return ERR_PTR(-ENOENT); 61 62 return inet_diag_table[proto]; 63 } 64 65 static void inet_diag_unlock_handler(const struct inet_diag_handler *handler) 66 { 67 mutex_unlock(&inet_diag_table_mutex); 68 } 69 70 void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk) 71 { 72 r->idiag_family = sk->sk_family; 73 74 r->id.idiag_sport = htons(sk->sk_num); 75 r->id.idiag_dport = sk->sk_dport; 76 r->id.idiag_if = sk->sk_bound_dev_if; 77 sock_diag_save_cookie(sk, r->id.idiag_cookie); 78 79 #if IS_ENABLED(CONFIG_IPV6) 80 if (sk->sk_family == AF_INET6) { 81 *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr; 82 *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr; 83 } else 84 #endif 85 { 86 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src)); 87 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst)); 88 89 r->id.idiag_src[0] = sk->sk_rcv_saddr; 90 r->id.idiag_dst[0] = sk->sk_daddr; 91 } 92 } 93 EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill); 94 95 static size_t inet_sk_attr_size(void) 96 { 97 return nla_total_size(sizeof(struct tcp_info)) 98 + nla_total_size(1) /* INET_DIAG_SHUTDOWN */ 99 + nla_total_size(1) /* INET_DIAG_TOS */ 100 + nla_total_size(1) /* INET_DIAG_TCLASS */ 101 + nla_total_size(sizeof(struct inet_diag_meminfo)) 102 + nla_total_size(sizeof(struct inet_diag_msg)) 103 + nla_total_size(SK_MEMINFO_VARS * sizeof(u32)) 104 + nla_total_size(TCP_CA_NAME_MAX) 105 + nla_total_size(sizeof(struct tcpvegas_info)) 106 + 64; 107 } 108 109 int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb, 110 struct inet_diag_msg *r, int ext, 111 struct user_namespace *user_ns) 112 { 113 const struct inet_sock *inet = inet_sk(sk); 114 115 if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown)) 116 goto errout; 117 118 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections, 119 * hence this needs to be included regardless of socket family. 120 */ 121 if (ext & (1 << (INET_DIAG_TOS - 1))) 122 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0) 123 goto errout; 124 125 #if IS_ENABLED(CONFIG_IPV6) 126 if (r->idiag_family == AF_INET6) { 127 if (ext & (1 << (INET_DIAG_TCLASS - 1))) 128 if (nla_put_u8(skb, INET_DIAG_TCLASS, 129 inet6_sk(sk)->tclass) < 0) 130 goto errout; 131 132 if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) && 133 nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk))) 134 goto errout; 135 } 136 #endif 137 138 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk)); 139 r->idiag_inode = sock_i_ino(sk); 140 141 return 0; 142 errout: 143 return 1; 144 } 145 EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill); 146 147 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk, 148 struct sk_buff *skb, const struct inet_diag_req_v2 *req, 149 struct user_namespace *user_ns, 150 u32 portid, u32 seq, u16 nlmsg_flags, 151 const struct nlmsghdr *unlh) 152 { 153 const struct tcp_congestion_ops *ca_ops; 154 const struct inet_diag_handler *handler; 155 int ext = req->idiag_ext; 156 struct inet_diag_msg *r; 157 struct nlmsghdr *nlh; 158 struct nlattr *attr; 159 void *info = NULL; 160 161 handler = inet_diag_table[req->sdiag_protocol]; 162 BUG_ON(!handler); 163 164 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r), 165 nlmsg_flags); 166 if (!nlh) 167 return -EMSGSIZE; 168 169 r = nlmsg_data(nlh); 170 BUG_ON(!sk_fullsock(sk)); 171 172 inet_diag_msg_common_fill(r, sk); 173 r->idiag_state = sk->sk_state; 174 r->idiag_timer = 0; 175 r->idiag_retrans = 0; 176 177 if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns)) 178 goto errout; 179 180 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) { 181 struct inet_diag_meminfo minfo = { 182 .idiag_rmem = sk_rmem_alloc_get(sk), 183 .idiag_wmem = sk->sk_wmem_queued, 184 .idiag_fmem = sk->sk_forward_alloc, 185 .idiag_tmem = sk_wmem_alloc_get(sk), 186 }; 187 188 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0) 189 goto errout; 190 } 191 192 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1))) 193 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO)) 194 goto errout; 195 196 if (!icsk) { 197 handler->idiag_get_info(sk, r, NULL); 198 goto out; 199 } 200 201 if (icsk->icsk_pending == ICSK_TIME_RETRANS || 202 icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS || 203 icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) { 204 r->idiag_timer = 1; 205 r->idiag_retrans = icsk->icsk_retransmits; 206 r->idiag_expires = 207 jiffies_to_msecs(icsk->icsk_timeout - jiffies); 208 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { 209 r->idiag_timer = 4; 210 r->idiag_retrans = icsk->icsk_probes_out; 211 r->idiag_expires = 212 jiffies_to_msecs(icsk->icsk_timeout - jiffies); 213 } else if (timer_pending(&sk->sk_timer)) { 214 r->idiag_timer = 2; 215 r->idiag_retrans = icsk->icsk_probes_out; 216 r->idiag_expires = 217 jiffies_to_msecs(sk->sk_timer.expires - jiffies); 218 } else { 219 r->idiag_timer = 0; 220 r->idiag_expires = 0; 221 } 222 223 if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) { 224 attr = nla_reserve_64bit(skb, INET_DIAG_INFO, 225 handler->idiag_info_size, 226 INET_DIAG_PAD); 227 if (!attr) 228 goto errout; 229 230 info = nla_data(attr); 231 } 232 233 if (ext & (1 << (INET_DIAG_CONG - 1))) { 234 int err = 0; 235 236 rcu_read_lock(); 237 ca_ops = READ_ONCE(icsk->icsk_ca_ops); 238 if (ca_ops) 239 err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name); 240 rcu_read_unlock(); 241 if (err < 0) 242 goto errout; 243 } 244 245 handler->idiag_get_info(sk, r, info); 246 247 if (sk->sk_state < TCP_TIME_WAIT) { 248 union tcp_cc_info info; 249 size_t sz = 0; 250 int attr; 251 252 rcu_read_lock(); 253 ca_ops = READ_ONCE(icsk->icsk_ca_ops); 254 if (ca_ops && ca_ops->get_info) 255 sz = ca_ops->get_info(sk, ext, &attr, &info); 256 rcu_read_unlock(); 257 if (sz && nla_put(skb, attr, sz, &info) < 0) 258 goto errout; 259 } 260 261 out: 262 nlmsg_end(skb, nlh); 263 return 0; 264 265 errout: 266 nlmsg_cancel(skb, nlh); 267 return -EMSGSIZE; 268 } 269 EXPORT_SYMBOL_GPL(inet_sk_diag_fill); 270 271 static int inet_csk_diag_fill(struct sock *sk, 272 struct sk_buff *skb, 273 const struct inet_diag_req_v2 *req, 274 struct user_namespace *user_ns, 275 u32 portid, u32 seq, u16 nlmsg_flags, 276 const struct nlmsghdr *unlh) 277 { 278 return inet_sk_diag_fill(sk, inet_csk(sk), skb, req, 279 user_ns, portid, seq, nlmsg_flags, unlh); 280 } 281 282 static int inet_twsk_diag_fill(struct sock *sk, 283 struct sk_buff *skb, 284 u32 portid, u32 seq, u16 nlmsg_flags, 285 const struct nlmsghdr *unlh) 286 { 287 struct inet_timewait_sock *tw = inet_twsk(sk); 288 struct inet_diag_msg *r; 289 struct nlmsghdr *nlh; 290 long tmo; 291 292 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r), 293 nlmsg_flags); 294 if (!nlh) 295 return -EMSGSIZE; 296 297 r = nlmsg_data(nlh); 298 BUG_ON(tw->tw_state != TCP_TIME_WAIT); 299 300 tmo = tw->tw_timer.expires - jiffies; 301 if (tmo < 0) 302 tmo = 0; 303 304 inet_diag_msg_common_fill(r, sk); 305 r->idiag_retrans = 0; 306 307 r->idiag_state = tw->tw_substate; 308 r->idiag_timer = 3; 309 r->idiag_expires = jiffies_to_msecs(tmo); 310 r->idiag_rqueue = 0; 311 r->idiag_wqueue = 0; 312 r->idiag_uid = 0; 313 r->idiag_inode = 0; 314 315 nlmsg_end(skb, nlh); 316 return 0; 317 } 318 319 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb, 320 u32 portid, u32 seq, u16 nlmsg_flags, 321 const struct nlmsghdr *unlh) 322 { 323 struct inet_diag_msg *r; 324 struct nlmsghdr *nlh; 325 long tmo; 326 327 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r), 328 nlmsg_flags); 329 if (!nlh) 330 return -EMSGSIZE; 331 332 r = nlmsg_data(nlh); 333 inet_diag_msg_common_fill(r, sk); 334 r->idiag_state = TCP_SYN_RECV; 335 r->idiag_timer = 1; 336 r->idiag_retrans = inet_reqsk(sk)->num_retrans; 337 338 BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) != 339 offsetof(struct sock, sk_cookie)); 340 341 tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies; 342 r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0; 343 r->idiag_rqueue = 0; 344 r->idiag_wqueue = 0; 345 r->idiag_uid = 0; 346 r->idiag_inode = 0; 347 348 nlmsg_end(skb, nlh); 349 return 0; 350 } 351 352 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, 353 const struct inet_diag_req_v2 *r, 354 struct user_namespace *user_ns, 355 u32 portid, u32 seq, u16 nlmsg_flags, 356 const struct nlmsghdr *unlh) 357 { 358 if (sk->sk_state == TCP_TIME_WAIT) 359 return inet_twsk_diag_fill(sk, skb, portid, seq, 360 nlmsg_flags, unlh); 361 362 if (sk->sk_state == TCP_NEW_SYN_RECV) 363 return inet_req_diag_fill(sk, skb, portid, seq, 364 nlmsg_flags, unlh); 365 366 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq, 367 nlmsg_flags, unlh); 368 } 369 370 struct sock *inet_diag_find_one_icsk(struct net *net, 371 struct inet_hashinfo *hashinfo, 372 const struct inet_diag_req_v2 *req) 373 { 374 struct sock *sk; 375 376 rcu_read_lock(); 377 if (req->sdiag_family == AF_INET) 378 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0], 379 req->id.idiag_dport, req->id.idiag_src[0], 380 req->id.idiag_sport, req->id.idiag_if); 381 #if IS_ENABLED(CONFIG_IPV6) 382 else if (req->sdiag_family == AF_INET6) { 383 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) && 384 ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src)) 385 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3], 386 req->id.idiag_dport, req->id.idiag_src[3], 387 req->id.idiag_sport, req->id.idiag_if); 388 else 389 sk = inet6_lookup(net, hashinfo, NULL, 0, 390 (struct in6_addr *)req->id.idiag_dst, 391 req->id.idiag_dport, 392 (struct in6_addr *)req->id.idiag_src, 393 req->id.idiag_sport, 394 req->id.idiag_if); 395 } 396 #endif 397 else { 398 rcu_read_unlock(); 399 return ERR_PTR(-EINVAL); 400 } 401 rcu_read_unlock(); 402 if (!sk) 403 return ERR_PTR(-ENOENT); 404 405 if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) { 406 sock_gen_put(sk); 407 return ERR_PTR(-ENOENT); 408 } 409 410 return sk; 411 } 412 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk); 413 414 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, 415 struct sk_buff *in_skb, 416 const struct nlmsghdr *nlh, 417 const struct inet_diag_req_v2 *req) 418 { 419 struct net *net = sock_net(in_skb->sk); 420 struct sk_buff *rep; 421 struct sock *sk; 422 int err; 423 424 sk = inet_diag_find_one_icsk(net, hashinfo, req); 425 if (IS_ERR(sk)) 426 return PTR_ERR(sk); 427 428 rep = nlmsg_new(inet_sk_attr_size(), GFP_KERNEL); 429 if (!rep) { 430 err = -ENOMEM; 431 goto out; 432 } 433 434 err = sk_diag_fill(sk, rep, req, 435 sk_user_ns(NETLINK_CB(in_skb).sk), 436 NETLINK_CB(in_skb).portid, 437 nlh->nlmsg_seq, 0, nlh); 438 if (err < 0) { 439 WARN_ON(err == -EMSGSIZE); 440 nlmsg_free(rep); 441 goto out; 442 } 443 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid, 444 MSG_DONTWAIT); 445 if (err > 0) 446 err = 0; 447 448 out: 449 if (sk) 450 sock_gen_put(sk); 451 452 return err; 453 } 454 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk); 455 456 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb, 457 const struct nlmsghdr *nlh, 458 const struct inet_diag_req_v2 *req) 459 { 460 const struct inet_diag_handler *handler; 461 int err; 462 463 handler = inet_diag_lock_handler(req->sdiag_protocol); 464 if (IS_ERR(handler)) 465 err = PTR_ERR(handler); 466 else if (cmd == SOCK_DIAG_BY_FAMILY) 467 err = handler->dump_one(in_skb, nlh, req); 468 else if (cmd == SOCK_DESTROY && handler->destroy) 469 err = handler->destroy(in_skb, req); 470 else 471 err = -EOPNOTSUPP; 472 inet_diag_unlock_handler(handler); 473 474 return err; 475 } 476 477 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits) 478 { 479 int words = bits >> 5; 480 481 bits &= 0x1f; 482 483 if (words) { 484 if (memcmp(a1, a2, words << 2)) 485 return 0; 486 } 487 if (bits) { 488 __be32 w1, w2; 489 __be32 mask; 490 491 w1 = a1[words]; 492 w2 = a2[words]; 493 494 mask = htonl((0xffffffff) << (32 - bits)); 495 496 if ((w1 ^ w2) & mask) 497 return 0; 498 } 499 500 return 1; 501 } 502 503 static int inet_diag_bc_run(const struct nlattr *_bc, 504 const struct inet_diag_entry *entry) 505 { 506 const void *bc = nla_data(_bc); 507 int len = nla_len(_bc); 508 509 while (len > 0) { 510 int yes = 1; 511 const struct inet_diag_bc_op *op = bc; 512 513 switch (op->code) { 514 case INET_DIAG_BC_NOP: 515 break; 516 case INET_DIAG_BC_JMP: 517 yes = 0; 518 break; 519 case INET_DIAG_BC_S_GE: 520 yes = entry->sport >= op[1].no; 521 break; 522 case INET_DIAG_BC_S_LE: 523 yes = entry->sport <= op[1].no; 524 break; 525 case INET_DIAG_BC_D_GE: 526 yes = entry->dport >= op[1].no; 527 break; 528 case INET_DIAG_BC_D_LE: 529 yes = entry->dport <= op[1].no; 530 break; 531 case INET_DIAG_BC_AUTO: 532 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); 533 break; 534 case INET_DIAG_BC_S_COND: 535 case INET_DIAG_BC_D_COND: { 536 const struct inet_diag_hostcond *cond; 537 const __be32 *addr; 538 539 cond = (const struct inet_diag_hostcond *)(op + 1); 540 if (cond->port != -1 && 541 cond->port != (op->code == INET_DIAG_BC_S_COND ? 542 entry->sport : entry->dport)) { 543 yes = 0; 544 break; 545 } 546 547 if (op->code == INET_DIAG_BC_S_COND) 548 addr = entry->saddr; 549 else 550 addr = entry->daddr; 551 552 if (cond->family != AF_UNSPEC && 553 cond->family != entry->family) { 554 if (entry->family == AF_INET6 && 555 cond->family == AF_INET) { 556 if (addr[0] == 0 && addr[1] == 0 && 557 addr[2] == htonl(0xffff) && 558 bitstring_match(addr + 3, 559 cond->addr, 560 cond->prefix_len)) 561 break; 562 } 563 yes = 0; 564 break; 565 } 566 567 if (cond->prefix_len == 0) 568 break; 569 if (bitstring_match(addr, cond->addr, 570 cond->prefix_len)) 571 break; 572 yes = 0; 573 break; 574 } 575 case INET_DIAG_BC_DEV_COND: { 576 u32 ifindex; 577 578 ifindex = *((const u32 *)(op + 1)); 579 if (ifindex != entry->ifindex) 580 yes = 0; 581 break; 582 } 583 } 584 585 if (yes) { 586 len -= op->yes; 587 bc += op->yes; 588 } else { 589 len -= op->no; 590 bc += op->no; 591 } 592 } 593 return len == 0; 594 } 595 596 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV) 597 */ 598 static void entry_fill_addrs(struct inet_diag_entry *entry, 599 const struct sock *sk) 600 { 601 #if IS_ENABLED(CONFIG_IPV6) 602 if (sk->sk_family == AF_INET6) { 603 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32; 604 entry->daddr = sk->sk_v6_daddr.s6_addr32; 605 } else 606 #endif 607 { 608 entry->saddr = &sk->sk_rcv_saddr; 609 entry->daddr = &sk->sk_daddr; 610 } 611 } 612 613 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk) 614 { 615 struct inet_sock *inet = inet_sk(sk); 616 struct inet_diag_entry entry; 617 618 if (!bc) 619 return 1; 620 621 entry.family = sk->sk_family; 622 entry_fill_addrs(&entry, sk); 623 entry.sport = inet->inet_num; 624 entry.dport = ntohs(inet->inet_dport); 625 entry.ifindex = sk->sk_bound_dev_if; 626 entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0; 627 628 return inet_diag_bc_run(bc, &entry); 629 } 630 EXPORT_SYMBOL_GPL(inet_diag_bc_sk); 631 632 static int valid_cc(const void *bc, int len, int cc) 633 { 634 while (len >= 0) { 635 const struct inet_diag_bc_op *op = bc; 636 637 if (cc > len) 638 return 0; 639 if (cc == len) 640 return 1; 641 if (op->yes < 4 || op->yes & 3) 642 return 0; 643 len -= op->yes; 644 bc += op->yes; 645 } 646 return 0; 647 } 648 649 /* data is u32 ifindex */ 650 static bool valid_devcond(const struct inet_diag_bc_op *op, int len, 651 int *min_len) 652 { 653 /* Check ifindex space. */ 654 *min_len += sizeof(u32); 655 if (len < *min_len) 656 return false; 657 658 return true; 659 } 660 /* Validate an inet_diag_hostcond. */ 661 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len, 662 int *min_len) 663 { 664 struct inet_diag_hostcond *cond; 665 int addr_len; 666 667 /* Check hostcond space. */ 668 *min_len += sizeof(struct inet_diag_hostcond); 669 if (len < *min_len) 670 return false; 671 cond = (struct inet_diag_hostcond *)(op + 1); 672 673 /* Check address family and address length. */ 674 switch (cond->family) { 675 case AF_UNSPEC: 676 addr_len = 0; 677 break; 678 case AF_INET: 679 addr_len = sizeof(struct in_addr); 680 break; 681 case AF_INET6: 682 addr_len = sizeof(struct in6_addr); 683 break; 684 default: 685 return false; 686 } 687 *min_len += addr_len; 688 if (len < *min_len) 689 return false; 690 691 /* Check prefix length (in bits) vs address length (in bytes). */ 692 if (cond->prefix_len > 8 * addr_len) 693 return false; 694 695 return true; 696 } 697 698 /* Validate a port comparison operator. */ 699 static bool valid_port_comparison(const struct inet_diag_bc_op *op, 700 int len, int *min_len) 701 { 702 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */ 703 *min_len += sizeof(struct inet_diag_bc_op); 704 if (len < *min_len) 705 return false; 706 return true; 707 } 708 709 static int inet_diag_bc_audit(const struct nlattr *attr) 710 { 711 const void *bytecode, *bc; 712 int bytecode_len, len; 713 714 if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op)) 715 return -EINVAL; 716 717 bytecode = bc = nla_data(attr); 718 len = bytecode_len = nla_len(attr); 719 720 while (len > 0) { 721 int min_len = sizeof(struct inet_diag_bc_op); 722 const struct inet_diag_bc_op *op = bc; 723 724 switch (op->code) { 725 case INET_DIAG_BC_S_COND: 726 case INET_DIAG_BC_D_COND: 727 if (!valid_hostcond(bc, len, &min_len)) 728 return -EINVAL; 729 break; 730 case INET_DIAG_BC_DEV_COND: 731 if (!valid_devcond(bc, len, &min_len)) 732 return -EINVAL; 733 break; 734 case INET_DIAG_BC_S_GE: 735 case INET_DIAG_BC_S_LE: 736 case INET_DIAG_BC_D_GE: 737 case INET_DIAG_BC_D_LE: 738 if (!valid_port_comparison(bc, len, &min_len)) 739 return -EINVAL; 740 break; 741 case INET_DIAG_BC_AUTO: 742 case INET_DIAG_BC_JMP: 743 case INET_DIAG_BC_NOP: 744 break; 745 default: 746 return -EINVAL; 747 } 748 749 if (op->code != INET_DIAG_BC_NOP) { 750 if (op->no < min_len || op->no > len + 4 || op->no & 3) 751 return -EINVAL; 752 if (op->no < len && 753 !valid_cc(bytecode, bytecode_len, len - op->no)) 754 return -EINVAL; 755 } 756 757 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3) 758 return -EINVAL; 759 bc += op->yes; 760 len -= op->yes; 761 } 762 return len == 0 ? 0 : -EINVAL; 763 } 764 765 static int inet_csk_diag_dump(struct sock *sk, 766 struct sk_buff *skb, 767 struct netlink_callback *cb, 768 const struct inet_diag_req_v2 *r, 769 const struct nlattr *bc) 770 { 771 if (!inet_diag_bc_sk(bc, sk)) 772 return 0; 773 774 return inet_csk_diag_fill(sk, skb, r, 775 sk_user_ns(NETLINK_CB(cb->skb).sk), 776 NETLINK_CB(cb->skb).portid, 777 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 778 } 779 780 static void twsk_build_assert(void) 781 { 782 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) != 783 offsetof(struct sock, sk_family)); 784 785 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) != 786 offsetof(struct inet_sock, inet_num)); 787 788 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) != 789 offsetof(struct inet_sock, inet_dport)); 790 791 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) != 792 offsetof(struct inet_sock, inet_rcv_saddr)); 793 794 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) != 795 offsetof(struct inet_sock, inet_daddr)); 796 797 #if IS_ENABLED(CONFIG_IPV6) 798 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) != 799 offsetof(struct sock, sk_v6_rcv_saddr)); 800 801 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) != 802 offsetof(struct sock, sk_v6_daddr)); 803 #endif 804 } 805 806 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb, 807 struct netlink_callback *cb, 808 const struct inet_diag_req_v2 *r, struct nlattr *bc) 809 { 810 struct net *net = sock_net(skb->sk); 811 int i, num, s_i, s_num; 812 u32 idiag_states = r->idiag_states; 813 814 if (idiag_states & TCPF_SYN_RECV) 815 idiag_states |= TCPF_NEW_SYN_RECV; 816 s_i = cb->args[1]; 817 s_num = num = cb->args[2]; 818 819 if (cb->args[0] == 0) { 820 if (!(idiag_states & TCPF_LISTEN)) 821 goto skip_listen_ht; 822 823 for (i = s_i; i < INET_LHTABLE_SIZE; i++) { 824 struct inet_listen_hashbucket *ilb; 825 struct sock *sk; 826 827 num = 0; 828 ilb = &hashinfo->listening_hash[i]; 829 spin_lock_bh(&ilb->lock); 830 sk_for_each(sk, &ilb->head) { 831 struct inet_sock *inet = inet_sk(sk); 832 833 if (!net_eq(sock_net(sk), net)) 834 continue; 835 836 if (num < s_num) { 837 num++; 838 continue; 839 } 840 841 if (r->sdiag_family != AF_UNSPEC && 842 sk->sk_family != r->sdiag_family) 843 goto next_listen; 844 845 if (r->id.idiag_sport != inet->inet_sport && 846 r->id.idiag_sport) 847 goto next_listen; 848 849 if (r->id.idiag_dport || 850 cb->args[3] > 0) 851 goto next_listen; 852 853 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) { 854 spin_unlock_bh(&ilb->lock); 855 goto done; 856 } 857 858 next_listen: 859 cb->args[3] = 0; 860 cb->args[4] = 0; 861 ++num; 862 } 863 spin_unlock_bh(&ilb->lock); 864 865 s_num = 0; 866 cb->args[3] = 0; 867 cb->args[4] = 0; 868 } 869 skip_listen_ht: 870 cb->args[0] = 1; 871 s_i = num = s_num = 0; 872 } 873 874 if (!(idiag_states & ~TCPF_LISTEN)) 875 goto out; 876 877 for (i = s_i; i <= hashinfo->ehash_mask; i++) { 878 struct inet_ehash_bucket *head = &hashinfo->ehash[i]; 879 spinlock_t *lock = inet_ehash_lockp(hashinfo, i); 880 struct hlist_nulls_node *node; 881 struct sock *sk; 882 883 num = 0; 884 885 if (hlist_nulls_empty(&head->chain)) 886 continue; 887 888 if (i > s_i) 889 s_num = 0; 890 891 spin_lock_bh(lock); 892 sk_nulls_for_each(sk, node, &head->chain) { 893 int state, res; 894 895 if (!net_eq(sock_net(sk), net)) 896 continue; 897 if (num < s_num) 898 goto next_normal; 899 state = (sk->sk_state == TCP_TIME_WAIT) ? 900 inet_twsk(sk)->tw_substate : sk->sk_state; 901 if (!(idiag_states & (1 << state))) 902 goto next_normal; 903 if (r->sdiag_family != AF_UNSPEC && 904 sk->sk_family != r->sdiag_family) 905 goto next_normal; 906 if (r->id.idiag_sport != htons(sk->sk_num) && 907 r->id.idiag_sport) 908 goto next_normal; 909 if (r->id.idiag_dport != sk->sk_dport && 910 r->id.idiag_dport) 911 goto next_normal; 912 twsk_build_assert(); 913 914 if (!inet_diag_bc_sk(bc, sk)) 915 goto next_normal; 916 917 res = sk_diag_fill(sk, skb, r, 918 sk_user_ns(NETLINK_CB(cb->skb).sk), 919 NETLINK_CB(cb->skb).portid, 920 cb->nlh->nlmsg_seq, NLM_F_MULTI, 921 cb->nlh); 922 if (res < 0) { 923 spin_unlock_bh(lock); 924 goto done; 925 } 926 next_normal: 927 ++num; 928 } 929 930 spin_unlock_bh(lock); 931 cond_resched(); 932 } 933 934 done: 935 cb->args[1] = i; 936 cb->args[2] = num; 937 out: 938 ; 939 } 940 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk); 941 942 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, 943 const struct inet_diag_req_v2 *r, 944 struct nlattr *bc) 945 { 946 const struct inet_diag_handler *handler; 947 int err = 0; 948 949 handler = inet_diag_lock_handler(r->sdiag_protocol); 950 if (!IS_ERR(handler)) 951 handler->dump(skb, cb, r, bc); 952 else 953 err = PTR_ERR(handler); 954 inet_diag_unlock_handler(handler); 955 956 return err ? : skb->len; 957 } 958 959 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) 960 { 961 int hdrlen = sizeof(struct inet_diag_req_v2); 962 struct nlattr *bc = NULL; 963 964 if (nlmsg_attrlen(cb->nlh, hdrlen)) 965 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); 966 967 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc); 968 } 969 970 static int inet_diag_type2proto(int type) 971 { 972 switch (type) { 973 case TCPDIAG_GETSOCK: 974 return IPPROTO_TCP; 975 case DCCPDIAG_GETSOCK: 976 return IPPROTO_DCCP; 977 default: 978 return 0; 979 } 980 } 981 982 static int inet_diag_dump_compat(struct sk_buff *skb, 983 struct netlink_callback *cb) 984 { 985 struct inet_diag_req *rc = nlmsg_data(cb->nlh); 986 int hdrlen = sizeof(struct inet_diag_req); 987 struct inet_diag_req_v2 req; 988 struct nlattr *bc = NULL; 989 990 req.sdiag_family = AF_UNSPEC; /* compatibility */ 991 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type); 992 req.idiag_ext = rc->idiag_ext; 993 req.idiag_states = rc->idiag_states; 994 req.id = rc->id; 995 996 if (nlmsg_attrlen(cb->nlh, hdrlen)) 997 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); 998 999 return __inet_diag_dump(skb, cb, &req, bc); 1000 } 1001 1002 static int inet_diag_get_exact_compat(struct sk_buff *in_skb, 1003 const struct nlmsghdr *nlh) 1004 { 1005 struct inet_diag_req *rc = nlmsg_data(nlh); 1006 struct inet_diag_req_v2 req; 1007 1008 req.sdiag_family = rc->idiag_family; 1009 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type); 1010 req.idiag_ext = rc->idiag_ext; 1011 req.idiag_states = rc->idiag_states; 1012 req.id = rc->id; 1013 1014 return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req); 1015 } 1016 1017 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh) 1018 { 1019 int hdrlen = sizeof(struct inet_diag_req); 1020 struct net *net = sock_net(skb->sk); 1021 1022 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX || 1023 nlmsg_len(nlh) < hdrlen) 1024 return -EINVAL; 1025 1026 if (nlh->nlmsg_flags & NLM_F_DUMP) { 1027 if (nlmsg_attrlen(nlh, hdrlen)) { 1028 struct nlattr *attr; 1029 int err; 1030 1031 attr = nlmsg_find_attr(nlh, hdrlen, 1032 INET_DIAG_REQ_BYTECODE); 1033 err = inet_diag_bc_audit(attr); 1034 if (err) 1035 return err; 1036 } 1037 { 1038 struct netlink_dump_control c = { 1039 .dump = inet_diag_dump_compat, 1040 }; 1041 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c); 1042 } 1043 } 1044 1045 return inet_diag_get_exact_compat(skb, nlh); 1046 } 1047 1048 static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h) 1049 { 1050 int hdrlen = sizeof(struct inet_diag_req_v2); 1051 struct net *net = sock_net(skb->sk); 1052 1053 if (nlmsg_len(h) < hdrlen) 1054 return -EINVAL; 1055 1056 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY && 1057 h->nlmsg_flags & NLM_F_DUMP) { 1058 if (nlmsg_attrlen(h, hdrlen)) { 1059 struct nlattr *attr; 1060 int err; 1061 1062 attr = nlmsg_find_attr(h, hdrlen, 1063 INET_DIAG_REQ_BYTECODE); 1064 err = inet_diag_bc_audit(attr); 1065 if (err) 1066 return err; 1067 } 1068 { 1069 struct netlink_dump_control c = { 1070 .dump = inet_diag_dump, 1071 }; 1072 return netlink_dump_start(net->diag_nlsk, skb, h, &c); 1073 } 1074 } 1075 1076 return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h)); 1077 } 1078 1079 static 1080 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk) 1081 { 1082 const struct inet_diag_handler *handler; 1083 struct nlmsghdr *nlh; 1084 struct nlattr *attr; 1085 struct inet_diag_msg *r; 1086 void *info = NULL; 1087 int err = 0; 1088 1089 nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0); 1090 if (!nlh) 1091 return -ENOMEM; 1092 1093 r = nlmsg_data(nlh); 1094 memset(r, 0, sizeof(*r)); 1095 inet_diag_msg_common_fill(r, sk); 1096 if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM) 1097 r->id.idiag_sport = inet_sk(sk)->inet_sport; 1098 r->idiag_state = sk->sk_state; 1099 1100 if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) { 1101 nlmsg_cancel(skb, nlh); 1102 return err; 1103 } 1104 1105 handler = inet_diag_lock_handler(sk->sk_protocol); 1106 if (IS_ERR(handler)) { 1107 inet_diag_unlock_handler(handler); 1108 nlmsg_cancel(skb, nlh); 1109 return PTR_ERR(handler); 1110 } 1111 1112 attr = handler->idiag_info_size 1113 ? nla_reserve_64bit(skb, INET_DIAG_INFO, 1114 handler->idiag_info_size, 1115 INET_DIAG_PAD) 1116 : NULL; 1117 if (attr) 1118 info = nla_data(attr); 1119 1120 handler->idiag_get_info(sk, r, info); 1121 inet_diag_unlock_handler(handler); 1122 1123 nlmsg_end(skb, nlh); 1124 return 0; 1125 } 1126 1127 static const struct sock_diag_handler inet_diag_handler = { 1128 .family = AF_INET, 1129 .dump = inet_diag_handler_cmd, 1130 .get_info = inet_diag_handler_get_info, 1131 .destroy = inet_diag_handler_cmd, 1132 }; 1133 1134 static const struct sock_diag_handler inet6_diag_handler = { 1135 .family = AF_INET6, 1136 .dump = inet_diag_handler_cmd, 1137 .get_info = inet_diag_handler_get_info, 1138 .destroy = inet_diag_handler_cmd, 1139 }; 1140 1141 int inet_diag_register(const struct inet_diag_handler *h) 1142 { 1143 const __u16 type = h->idiag_type; 1144 int err = -EINVAL; 1145 1146 if (type >= IPPROTO_MAX) 1147 goto out; 1148 1149 mutex_lock(&inet_diag_table_mutex); 1150 err = -EEXIST; 1151 if (!inet_diag_table[type]) { 1152 inet_diag_table[type] = h; 1153 err = 0; 1154 } 1155 mutex_unlock(&inet_diag_table_mutex); 1156 out: 1157 return err; 1158 } 1159 EXPORT_SYMBOL_GPL(inet_diag_register); 1160 1161 void inet_diag_unregister(const struct inet_diag_handler *h) 1162 { 1163 const __u16 type = h->idiag_type; 1164 1165 if (type >= IPPROTO_MAX) 1166 return; 1167 1168 mutex_lock(&inet_diag_table_mutex); 1169 inet_diag_table[type] = NULL; 1170 mutex_unlock(&inet_diag_table_mutex); 1171 } 1172 EXPORT_SYMBOL_GPL(inet_diag_unregister); 1173 1174 static int __init inet_diag_init(void) 1175 { 1176 const int inet_diag_table_size = (IPPROTO_MAX * 1177 sizeof(struct inet_diag_handler *)); 1178 int err = -ENOMEM; 1179 1180 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL); 1181 if (!inet_diag_table) 1182 goto out; 1183 1184 err = sock_diag_register(&inet_diag_handler); 1185 if (err) 1186 goto out_free_nl; 1187 1188 err = sock_diag_register(&inet6_diag_handler); 1189 if (err) 1190 goto out_free_inet; 1191 1192 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat); 1193 out: 1194 return err; 1195 1196 out_free_inet: 1197 sock_diag_unregister(&inet_diag_handler); 1198 out_free_nl: 1199 kfree(inet_diag_table); 1200 goto out; 1201 } 1202 1203 static void __exit inet_diag_exit(void) 1204 { 1205 sock_diag_unregister(&inet6_diag_handler); 1206 sock_diag_unregister(&inet_diag_handler); 1207 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat); 1208 kfree(inet_diag_table); 1209 } 1210 1211 module_init(inet_diag_init); 1212 module_exit(inet_diag_exit); 1213 MODULE_LICENSE("GPL"); 1214 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */); 1215 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */); 1216