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 u32 mark; 49 }; 50 51 static DEFINE_MUTEX(inet_diag_table_mutex); 52 53 static const struct inet_diag_handler *inet_diag_lock_handler(int proto) 54 { 55 if (!inet_diag_table[proto]) 56 request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK, 57 NETLINK_SOCK_DIAG, AF_INET, proto); 58 59 mutex_lock(&inet_diag_table_mutex); 60 if (!inet_diag_table[proto]) 61 return ERR_PTR(-ENOENT); 62 63 return inet_diag_table[proto]; 64 } 65 66 static void inet_diag_unlock_handler(const struct inet_diag_handler *handler) 67 { 68 mutex_unlock(&inet_diag_table_mutex); 69 } 70 71 void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk) 72 { 73 r->idiag_family = sk->sk_family; 74 75 r->id.idiag_sport = htons(sk->sk_num); 76 r->id.idiag_dport = sk->sk_dport; 77 r->id.idiag_if = sk->sk_bound_dev_if; 78 sock_diag_save_cookie(sk, r->id.idiag_cookie); 79 80 #if IS_ENABLED(CONFIG_IPV6) 81 if (sk->sk_family == AF_INET6) { 82 *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr; 83 *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr; 84 } else 85 #endif 86 { 87 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src)); 88 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst)); 89 90 r->id.idiag_src[0] = sk->sk_rcv_saddr; 91 r->id.idiag_dst[0] = sk->sk_daddr; 92 } 93 } 94 EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill); 95 96 static size_t inet_sk_attr_size(void) 97 { 98 return nla_total_size(sizeof(struct tcp_info)) 99 + nla_total_size(1) /* INET_DIAG_SHUTDOWN */ 100 + nla_total_size(1) /* INET_DIAG_TOS */ 101 + nla_total_size(1) /* INET_DIAG_TCLASS */ 102 + nla_total_size(4) /* INET_DIAG_MARK */ 103 + nla_total_size(sizeof(struct inet_diag_meminfo)) 104 + nla_total_size(sizeof(struct inet_diag_msg)) 105 + nla_total_size(SK_MEMINFO_VARS * sizeof(u32)) 106 + nla_total_size(TCP_CA_NAME_MAX) 107 + nla_total_size(sizeof(struct tcpvegas_info)) 108 + 64; 109 } 110 111 int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb, 112 struct inet_diag_msg *r, int ext, 113 struct user_namespace *user_ns, 114 bool net_admin) 115 { 116 const struct inet_sock *inet = inet_sk(sk); 117 118 if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown)) 119 goto errout; 120 121 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections, 122 * hence this needs to be included regardless of socket family. 123 */ 124 if (ext & (1 << (INET_DIAG_TOS - 1))) 125 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0) 126 goto errout; 127 128 #if IS_ENABLED(CONFIG_IPV6) 129 if (r->idiag_family == AF_INET6) { 130 if (ext & (1 << (INET_DIAG_TCLASS - 1))) 131 if (nla_put_u8(skb, INET_DIAG_TCLASS, 132 inet6_sk(sk)->tclass) < 0) 133 goto errout; 134 135 if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) && 136 nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk))) 137 goto errout; 138 } 139 #endif 140 141 if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, sk->sk_mark)) 142 goto errout; 143 144 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk)); 145 r->idiag_inode = sock_i_ino(sk); 146 147 return 0; 148 errout: 149 return 1; 150 } 151 EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill); 152 153 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk, 154 struct sk_buff *skb, const struct inet_diag_req_v2 *req, 155 struct user_namespace *user_ns, 156 u32 portid, u32 seq, u16 nlmsg_flags, 157 const struct nlmsghdr *unlh, 158 bool net_admin) 159 { 160 const struct tcp_congestion_ops *ca_ops; 161 const struct inet_diag_handler *handler; 162 int ext = req->idiag_ext; 163 struct inet_diag_msg *r; 164 struct nlmsghdr *nlh; 165 struct nlattr *attr; 166 void *info = NULL; 167 168 handler = inet_diag_table[req->sdiag_protocol]; 169 BUG_ON(!handler); 170 171 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r), 172 nlmsg_flags); 173 if (!nlh) 174 return -EMSGSIZE; 175 176 r = nlmsg_data(nlh); 177 BUG_ON(!sk_fullsock(sk)); 178 179 inet_diag_msg_common_fill(r, sk); 180 r->idiag_state = sk->sk_state; 181 r->idiag_timer = 0; 182 r->idiag_retrans = 0; 183 184 if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns, net_admin)) 185 goto errout; 186 187 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) { 188 struct inet_diag_meminfo minfo = { 189 .idiag_rmem = sk_rmem_alloc_get(sk), 190 .idiag_wmem = sk->sk_wmem_queued, 191 .idiag_fmem = sk->sk_forward_alloc, 192 .idiag_tmem = sk_wmem_alloc_get(sk), 193 }; 194 195 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0) 196 goto errout; 197 } 198 199 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1))) 200 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO)) 201 goto errout; 202 203 if (!icsk) { 204 handler->idiag_get_info(sk, r, NULL); 205 goto out; 206 } 207 208 if (icsk->icsk_pending == ICSK_TIME_RETRANS || 209 icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS || 210 icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) { 211 r->idiag_timer = 1; 212 r->idiag_retrans = icsk->icsk_retransmits; 213 r->idiag_expires = 214 jiffies_to_msecs(icsk->icsk_timeout - jiffies); 215 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { 216 r->idiag_timer = 4; 217 r->idiag_retrans = icsk->icsk_probes_out; 218 r->idiag_expires = 219 jiffies_to_msecs(icsk->icsk_timeout - jiffies); 220 } else if (timer_pending(&sk->sk_timer)) { 221 r->idiag_timer = 2; 222 r->idiag_retrans = icsk->icsk_probes_out; 223 r->idiag_expires = 224 jiffies_to_msecs(sk->sk_timer.expires - jiffies); 225 } else { 226 r->idiag_timer = 0; 227 r->idiag_expires = 0; 228 } 229 230 if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) { 231 attr = nla_reserve_64bit(skb, INET_DIAG_INFO, 232 handler->idiag_info_size, 233 INET_DIAG_PAD); 234 if (!attr) 235 goto errout; 236 237 info = nla_data(attr); 238 } 239 240 if (ext & (1 << (INET_DIAG_CONG - 1))) { 241 int err = 0; 242 243 rcu_read_lock(); 244 ca_ops = READ_ONCE(icsk->icsk_ca_ops); 245 if (ca_ops) 246 err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name); 247 rcu_read_unlock(); 248 if (err < 0) 249 goto errout; 250 } 251 252 handler->idiag_get_info(sk, r, info); 253 254 if (sk->sk_state < TCP_TIME_WAIT) { 255 union tcp_cc_info info; 256 size_t sz = 0; 257 int attr; 258 259 rcu_read_lock(); 260 ca_ops = READ_ONCE(icsk->icsk_ca_ops); 261 if (ca_ops && ca_ops->get_info) 262 sz = ca_ops->get_info(sk, ext, &attr, &info); 263 rcu_read_unlock(); 264 if (sz && nla_put(skb, attr, sz, &info) < 0) 265 goto errout; 266 } 267 268 out: 269 nlmsg_end(skb, nlh); 270 return 0; 271 272 errout: 273 nlmsg_cancel(skb, nlh); 274 return -EMSGSIZE; 275 } 276 EXPORT_SYMBOL_GPL(inet_sk_diag_fill); 277 278 static int inet_csk_diag_fill(struct sock *sk, 279 struct sk_buff *skb, 280 const struct inet_diag_req_v2 *req, 281 struct user_namespace *user_ns, 282 u32 portid, u32 seq, u16 nlmsg_flags, 283 const struct nlmsghdr *unlh, 284 bool net_admin) 285 { 286 return inet_sk_diag_fill(sk, inet_csk(sk), skb, req, user_ns, 287 portid, seq, nlmsg_flags, unlh, net_admin); 288 } 289 290 static int inet_twsk_diag_fill(struct sock *sk, 291 struct sk_buff *skb, 292 u32 portid, u32 seq, u16 nlmsg_flags, 293 const struct nlmsghdr *unlh) 294 { 295 struct inet_timewait_sock *tw = inet_twsk(sk); 296 struct inet_diag_msg *r; 297 struct nlmsghdr *nlh; 298 long tmo; 299 300 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r), 301 nlmsg_flags); 302 if (!nlh) 303 return -EMSGSIZE; 304 305 r = nlmsg_data(nlh); 306 BUG_ON(tw->tw_state != TCP_TIME_WAIT); 307 308 tmo = tw->tw_timer.expires - jiffies; 309 if (tmo < 0) 310 tmo = 0; 311 312 inet_diag_msg_common_fill(r, sk); 313 r->idiag_retrans = 0; 314 315 r->idiag_state = tw->tw_substate; 316 r->idiag_timer = 3; 317 r->idiag_expires = jiffies_to_msecs(tmo); 318 r->idiag_rqueue = 0; 319 r->idiag_wqueue = 0; 320 r->idiag_uid = 0; 321 r->idiag_inode = 0; 322 323 nlmsg_end(skb, nlh); 324 return 0; 325 } 326 327 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb, 328 u32 portid, u32 seq, u16 nlmsg_flags, 329 const struct nlmsghdr *unlh, bool net_admin) 330 { 331 struct request_sock *reqsk = inet_reqsk(sk); 332 struct inet_diag_msg *r; 333 struct nlmsghdr *nlh; 334 long tmo; 335 336 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r), 337 nlmsg_flags); 338 if (!nlh) 339 return -EMSGSIZE; 340 341 r = nlmsg_data(nlh); 342 inet_diag_msg_common_fill(r, sk); 343 r->idiag_state = TCP_SYN_RECV; 344 r->idiag_timer = 1; 345 r->idiag_retrans = reqsk->num_retrans; 346 347 BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) != 348 offsetof(struct sock, sk_cookie)); 349 350 tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies; 351 r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0; 352 r->idiag_rqueue = 0; 353 r->idiag_wqueue = 0; 354 r->idiag_uid = 0; 355 r->idiag_inode = 0; 356 357 if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, 358 inet_rsk(reqsk)->ir_mark)) 359 return -EMSGSIZE; 360 361 nlmsg_end(skb, nlh); 362 return 0; 363 } 364 365 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, 366 const struct inet_diag_req_v2 *r, 367 struct user_namespace *user_ns, 368 u32 portid, u32 seq, u16 nlmsg_flags, 369 const struct nlmsghdr *unlh, bool net_admin) 370 { 371 if (sk->sk_state == TCP_TIME_WAIT) 372 return inet_twsk_diag_fill(sk, skb, portid, seq, 373 nlmsg_flags, unlh); 374 375 if (sk->sk_state == TCP_NEW_SYN_RECV) 376 return inet_req_diag_fill(sk, skb, portid, seq, 377 nlmsg_flags, unlh, net_admin); 378 379 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq, 380 nlmsg_flags, unlh, net_admin); 381 } 382 383 struct sock *inet_diag_find_one_icsk(struct net *net, 384 struct inet_hashinfo *hashinfo, 385 const struct inet_diag_req_v2 *req) 386 { 387 struct sock *sk; 388 389 rcu_read_lock(); 390 if (req->sdiag_family == AF_INET) 391 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0], 392 req->id.idiag_dport, req->id.idiag_src[0], 393 req->id.idiag_sport, req->id.idiag_if); 394 #if IS_ENABLED(CONFIG_IPV6) 395 else if (req->sdiag_family == AF_INET6) { 396 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) && 397 ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src)) 398 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3], 399 req->id.idiag_dport, req->id.idiag_src[3], 400 req->id.idiag_sport, req->id.idiag_if); 401 else 402 sk = inet6_lookup(net, hashinfo, NULL, 0, 403 (struct in6_addr *)req->id.idiag_dst, 404 req->id.idiag_dport, 405 (struct in6_addr *)req->id.idiag_src, 406 req->id.idiag_sport, 407 req->id.idiag_if); 408 } 409 #endif 410 else { 411 rcu_read_unlock(); 412 return ERR_PTR(-EINVAL); 413 } 414 rcu_read_unlock(); 415 if (!sk) 416 return ERR_PTR(-ENOENT); 417 418 if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) { 419 sock_gen_put(sk); 420 return ERR_PTR(-ENOENT); 421 } 422 423 return sk; 424 } 425 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk); 426 427 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, 428 struct sk_buff *in_skb, 429 const struct nlmsghdr *nlh, 430 const struct inet_diag_req_v2 *req) 431 { 432 struct net *net = sock_net(in_skb->sk); 433 struct sk_buff *rep; 434 struct sock *sk; 435 int err; 436 437 sk = inet_diag_find_one_icsk(net, hashinfo, req); 438 if (IS_ERR(sk)) 439 return PTR_ERR(sk); 440 441 rep = nlmsg_new(inet_sk_attr_size(), GFP_KERNEL); 442 if (!rep) { 443 err = -ENOMEM; 444 goto out; 445 } 446 447 err = sk_diag_fill(sk, rep, req, 448 sk_user_ns(NETLINK_CB(in_skb).sk), 449 NETLINK_CB(in_skb).portid, 450 nlh->nlmsg_seq, 0, nlh, 451 netlink_net_capable(in_skb, CAP_NET_ADMIN)); 452 if (err < 0) { 453 WARN_ON(err == -EMSGSIZE); 454 nlmsg_free(rep); 455 goto out; 456 } 457 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid, 458 MSG_DONTWAIT); 459 if (err > 0) 460 err = 0; 461 462 out: 463 if (sk) 464 sock_gen_put(sk); 465 466 return err; 467 } 468 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk); 469 470 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb, 471 const struct nlmsghdr *nlh, 472 const struct inet_diag_req_v2 *req) 473 { 474 const struct inet_diag_handler *handler; 475 int err; 476 477 handler = inet_diag_lock_handler(req->sdiag_protocol); 478 if (IS_ERR(handler)) 479 err = PTR_ERR(handler); 480 else if (cmd == SOCK_DIAG_BY_FAMILY) 481 err = handler->dump_one(in_skb, nlh, req); 482 else if (cmd == SOCK_DESTROY && handler->destroy) 483 err = handler->destroy(in_skb, req); 484 else 485 err = -EOPNOTSUPP; 486 inet_diag_unlock_handler(handler); 487 488 return err; 489 } 490 491 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits) 492 { 493 int words = bits >> 5; 494 495 bits &= 0x1f; 496 497 if (words) { 498 if (memcmp(a1, a2, words << 2)) 499 return 0; 500 } 501 if (bits) { 502 __be32 w1, w2; 503 __be32 mask; 504 505 w1 = a1[words]; 506 w2 = a2[words]; 507 508 mask = htonl((0xffffffff) << (32 - bits)); 509 510 if ((w1 ^ w2) & mask) 511 return 0; 512 } 513 514 return 1; 515 } 516 517 static int inet_diag_bc_run(const struct nlattr *_bc, 518 const struct inet_diag_entry *entry) 519 { 520 const void *bc = nla_data(_bc); 521 int len = nla_len(_bc); 522 523 while (len > 0) { 524 int yes = 1; 525 const struct inet_diag_bc_op *op = bc; 526 527 switch (op->code) { 528 case INET_DIAG_BC_NOP: 529 break; 530 case INET_DIAG_BC_JMP: 531 yes = 0; 532 break; 533 case INET_DIAG_BC_S_GE: 534 yes = entry->sport >= op[1].no; 535 break; 536 case INET_DIAG_BC_S_LE: 537 yes = entry->sport <= op[1].no; 538 break; 539 case INET_DIAG_BC_D_GE: 540 yes = entry->dport >= op[1].no; 541 break; 542 case INET_DIAG_BC_D_LE: 543 yes = entry->dport <= op[1].no; 544 break; 545 case INET_DIAG_BC_AUTO: 546 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); 547 break; 548 case INET_DIAG_BC_S_COND: 549 case INET_DIAG_BC_D_COND: { 550 const struct inet_diag_hostcond *cond; 551 const __be32 *addr; 552 553 cond = (const struct inet_diag_hostcond *)(op + 1); 554 if (cond->port != -1 && 555 cond->port != (op->code == INET_DIAG_BC_S_COND ? 556 entry->sport : entry->dport)) { 557 yes = 0; 558 break; 559 } 560 561 if (op->code == INET_DIAG_BC_S_COND) 562 addr = entry->saddr; 563 else 564 addr = entry->daddr; 565 566 if (cond->family != AF_UNSPEC && 567 cond->family != entry->family) { 568 if (entry->family == AF_INET6 && 569 cond->family == AF_INET) { 570 if (addr[0] == 0 && addr[1] == 0 && 571 addr[2] == htonl(0xffff) && 572 bitstring_match(addr + 3, 573 cond->addr, 574 cond->prefix_len)) 575 break; 576 } 577 yes = 0; 578 break; 579 } 580 581 if (cond->prefix_len == 0) 582 break; 583 if (bitstring_match(addr, cond->addr, 584 cond->prefix_len)) 585 break; 586 yes = 0; 587 break; 588 } 589 case INET_DIAG_BC_DEV_COND: { 590 u32 ifindex; 591 592 ifindex = *((const u32 *)(op + 1)); 593 if (ifindex != entry->ifindex) 594 yes = 0; 595 break; 596 } 597 case INET_DIAG_BC_MARK_COND: { 598 struct inet_diag_markcond *cond; 599 600 cond = (struct inet_diag_markcond *)(op + 1); 601 if ((entry->mark & cond->mask) != cond->mark) 602 yes = 0; 603 break; 604 } 605 } 606 607 if (yes) { 608 len -= op->yes; 609 bc += op->yes; 610 } else { 611 len -= op->no; 612 bc += op->no; 613 } 614 } 615 return len == 0; 616 } 617 618 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV) 619 */ 620 static void entry_fill_addrs(struct inet_diag_entry *entry, 621 const struct sock *sk) 622 { 623 #if IS_ENABLED(CONFIG_IPV6) 624 if (sk->sk_family == AF_INET6) { 625 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32; 626 entry->daddr = sk->sk_v6_daddr.s6_addr32; 627 } else 628 #endif 629 { 630 entry->saddr = &sk->sk_rcv_saddr; 631 entry->daddr = &sk->sk_daddr; 632 } 633 } 634 635 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk) 636 { 637 struct inet_sock *inet = inet_sk(sk); 638 struct inet_diag_entry entry; 639 640 if (!bc) 641 return 1; 642 643 entry.family = sk->sk_family; 644 entry_fill_addrs(&entry, sk); 645 entry.sport = inet->inet_num; 646 entry.dport = ntohs(inet->inet_dport); 647 entry.ifindex = sk->sk_bound_dev_if; 648 entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0; 649 if (sk_fullsock(sk)) 650 entry.mark = sk->sk_mark; 651 else if (sk->sk_state == TCP_NEW_SYN_RECV) 652 entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark; 653 else 654 entry.mark = 0; 655 656 return inet_diag_bc_run(bc, &entry); 657 } 658 EXPORT_SYMBOL_GPL(inet_diag_bc_sk); 659 660 static int valid_cc(const void *bc, int len, int cc) 661 { 662 while (len >= 0) { 663 const struct inet_diag_bc_op *op = bc; 664 665 if (cc > len) 666 return 0; 667 if (cc == len) 668 return 1; 669 if (op->yes < 4 || op->yes & 3) 670 return 0; 671 len -= op->yes; 672 bc += op->yes; 673 } 674 return 0; 675 } 676 677 /* data is u32 ifindex */ 678 static bool valid_devcond(const struct inet_diag_bc_op *op, int len, 679 int *min_len) 680 { 681 /* Check ifindex space. */ 682 *min_len += sizeof(u32); 683 if (len < *min_len) 684 return false; 685 686 return true; 687 } 688 /* Validate an inet_diag_hostcond. */ 689 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len, 690 int *min_len) 691 { 692 struct inet_diag_hostcond *cond; 693 int addr_len; 694 695 /* Check hostcond space. */ 696 *min_len += sizeof(struct inet_diag_hostcond); 697 if (len < *min_len) 698 return false; 699 cond = (struct inet_diag_hostcond *)(op + 1); 700 701 /* Check address family and address length. */ 702 switch (cond->family) { 703 case AF_UNSPEC: 704 addr_len = 0; 705 break; 706 case AF_INET: 707 addr_len = sizeof(struct in_addr); 708 break; 709 case AF_INET6: 710 addr_len = sizeof(struct in6_addr); 711 break; 712 default: 713 return false; 714 } 715 *min_len += addr_len; 716 if (len < *min_len) 717 return false; 718 719 /* Check prefix length (in bits) vs address length (in bytes). */ 720 if (cond->prefix_len > 8 * addr_len) 721 return false; 722 723 return true; 724 } 725 726 /* Validate a port comparison operator. */ 727 static bool valid_port_comparison(const struct inet_diag_bc_op *op, 728 int len, int *min_len) 729 { 730 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */ 731 *min_len += sizeof(struct inet_diag_bc_op); 732 if (len < *min_len) 733 return false; 734 return true; 735 } 736 737 static bool valid_markcond(const struct inet_diag_bc_op *op, int len, 738 int *min_len) 739 { 740 *min_len += sizeof(struct inet_diag_markcond); 741 return len >= *min_len; 742 } 743 744 static int inet_diag_bc_audit(const struct nlattr *attr, 745 const struct sk_buff *skb) 746 { 747 bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN); 748 const void *bytecode, *bc; 749 int bytecode_len, len; 750 751 if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op)) 752 return -EINVAL; 753 754 bytecode = bc = nla_data(attr); 755 len = bytecode_len = nla_len(attr); 756 757 while (len > 0) { 758 int min_len = sizeof(struct inet_diag_bc_op); 759 const struct inet_diag_bc_op *op = bc; 760 761 switch (op->code) { 762 case INET_DIAG_BC_S_COND: 763 case INET_DIAG_BC_D_COND: 764 if (!valid_hostcond(bc, len, &min_len)) 765 return -EINVAL; 766 break; 767 case INET_DIAG_BC_DEV_COND: 768 if (!valid_devcond(bc, len, &min_len)) 769 return -EINVAL; 770 break; 771 case INET_DIAG_BC_S_GE: 772 case INET_DIAG_BC_S_LE: 773 case INET_DIAG_BC_D_GE: 774 case INET_DIAG_BC_D_LE: 775 if (!valid_port_comparison(bc, len, &min_len)) 776 return -EINVAL; 777 break; 778 case INET_DIAG_BC_MARK_COND: 779 if (!net_admin) 780 return -EPERM; 781 if (!valid_markcond(bc, len, &min_len)) 782 return -EINVAL; 783 break; 784 case INET_DIAG_BC_AUTO: 785 case INET_DIAG_BC_JMP: 786 case INET_DIAG_BC_NOP: 787 break; 788 default: 789 return -EINVAL; 790 } 791 792 if (op->code != INET_DIAG_BC_NOP) { 793 if (op->no < min_len || op->no > len + 4 || op->no & 3) 794 return -EINVAL; 795 if (op->no < len && 796 !valid_cc(bytecode, bytecode_len, len - op->no)) 797 return -EINVAL; 798 } 799 800 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3) 801 return -EINVAL; 802 bc += op->yes; 803 len -= op->yes; 804 } 805 return len == 0 ? 0 : -EINVAL; 806 } 807 808 static int inet_csk_diag_dump(struct sock *sk, 809 struct sk_buff *skb, 810 struct netlink_callback *cb, 811 const struct inet_diag_req_v2 *r, 812 const struct nlattr *bc, 813 bool net_admin) 814 { 815 if (!inet_diag_bc_sk(bc, sk)) 816 return 0; 817 818 return inet_csk_diag_fill(sk, skb, r, 819 sk_user_ns(NETLINK_CB(cb->skb).sk), 820 NETLINK_CB(cb->skb).portid, 821 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh, 822 net_admin); 823 } 824 825 static void twsk_build_assert(void) 826 { 827 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) != 828 offsetof(struct sock, sk_family)); 829 830 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) != 831 offsetof(struct inet_sock, inet_num)); 832 833 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) != 834 offsetof(struct inet_sock, inet_dport)); 835 836 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) != 837 offsetof(struct inet_sock, inet_rcv_saddr)); 838 839 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) != 840 offsetof(struct inet_sock, inet_daddr)); 841 842 #if IS_ENABLED(CONFIG_IPV6) 843 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) != 844 offsetof(struct sock, sk_v6_rcv_saddr)); 845 846 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) != 847 offsetof(struct sock, sk_v6_daddr)); 848 #endif 849 } 850 851 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb, 852 struct netlink_callback *cb, 853 const struct inet_diag_req_v2 *r, struct nlattr *bc) 854 { 855 struct net *net = sock_net(skb->sk); 856 int i, num, s_i, s_num; 857 u32 idiag_states = r->idiag_states; 858 bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN); 859 860 if (idiag_states & TCPF_SYN_RECV) 861 idiag_states |= TCPF_NEW_SYN_RECV; 862 s_i = cb->args[1]; 863 s_num = num = cb->args[2]; 864 865 if (cb->args[0] == 0) { 866 if (!(idiag_states & TCPF_LISTEN)) 867 goto skip_listen_ht; 868 869 for (i = s_i; i < INET_LHTABLE_SIZE; i++) { 870 struct inet_listen_hashbucket *ilb; 871 struct sock *sk; 872 873 num = 0; 874 ilb = &hashinfo->listening_hash[i]; 875 spin_lock_bh(&ilb->lock); 876 sk_for_each(sk, &ilb->head) { 877 struct inet_sock *inet = inet_sk(sk); 878 879 if (!net_eq(sock_net(sk), net)) 880 continue; 881 882 if (num < s_num) { 883 num++; 884 continue; 885 } 886 887 if (r->sdiag_family != AF_UNSPEC && 888 sk->sk_family != r->sdiag_family) 889 goto next_listen; 890 891 if (r->id.idiag_sport != inet->inet_sport && 892 r->id.idiag_sport) 893 goto next_listen; 894 895 if (r->id.idiag_dport || 896 cb->args[3] > 0) 897 goto next_listen; 898 899 if (inet_csk_diag_dump(sk, skb, cb, r, 900 bc, net_admin) < 0) { 901 spin_unlock_bh(&ilb->lock); 902 goto done; 903 } 904 905 next_listen: 906 cb->args[3] = 0; 907 cb->args[4] = 0; 908 ++num; 909 } 910 spin_unlock_bh(&ilb->lock); 911 912 s_num = 0; 913 cb->args[3] = 0; 914 cb->args[4] = 0; 915 } 916 skip_listen_ht: 917 cb->args[0] = 1; 918 s_i = num = s_num = 0; 919 } 920 921 if (!(idiag_states & ~TCPF_LISTEN)) 922 goto out; 923 924 for (i = s_i; i <= hashinfo->ehash_mask; i++) { 925 struct inet_ehash_bucket *head = &hashinfo->ehash[i]; 926 spinlock_t *lock = inet_ehash_lockp(hashinfo, i); 927 struct hlist_nulls_node *node; 928 struct sock *sk; 929 930 num = 0; 931 932 if (hlist_nulls_empty(&head->chain)) 933 continue; 934 935 if (i > s_i) 936 s_num = 0; 937 938 spin_lock_bh(lock); 939 sk_nulls_for_each(sk, node, &head->chain) { 940 int state, res; 941 942 if (!net_eq(sock_net(sk), net)) 943 continue; 944 if (num < s_num) 945 goto next_normal; 946 state = (sk->sk_state == TCP_TIME_WAIT) ? 947 inet_twsk(sk)->tw_substate : sk->sk_state; 948 if (!(idiag_states & (1 << state))) 949 goto next_normal; 950 if (r->sdiag_family != AF_UNSPEC && 951 sk->sk_family != r->sdiag_family) 952 goto next_normal; 953 if (r->id.idiag_sport != htons(sk->sk_num) && 954 r->id.idiag_sport) 955 goto next_normal; 956 if (r->id.idiag_dport != sk->sk_dport && 957 r->id.idiag_dport) 958 goto next_normal; 959 twsk_build_assert(); 960 961 if (!inet_diag_bc_sk(bc, sk)) 962 goto next_normal; 963 964 res = sk_diag_fill(sk, skb, r, 965 sk_user_ns(NETLINK_CB(cb->skb).sk), 966 NETLINK_CB(cb->skb).portid, 967 cb->nlh->nlmsg_seq, NLM_F_MULTI, 968 cb->nlh, net_admin); 969 if (res < 0) { 970 spin_unlock_bh(lock); 971 goto done; 972 } 973 next_normal: 974 ++num; 975 } 976 977 spin_unlock_bh(lock); 978 cond_resched(); 979 } 980 981 done: 982 cb->args[1] = i; 983 cb->args[2] = num; 984 out: 985 ; 986 } 987 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk); 988 989 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, 990 const struct inet_diag_req_v2 *r, 991 struct nlattr *bc) 992 { 993 const struct inet_diag_handler *handler; 994 int err = 0; 995 996 handler = inet_diag_lock_handler(r->sdiag_protocol); 997 if (!IS_ERR(handler)) 998 handler->dump(skb, cb, r, bc); 999 else 1000 err = PTR_ERR(handler); 1001 inet_diag_unlock_handler(handler); 1002 1003 return err ? : skb->len; 1004 } 1005 1006 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) 1007 { 1008 int hdrlen = sizeof(struct inet_diag_req_v2); 1009 struct nlattr *bc = NULL; 1010 1011 if (nlmsg_attrlen(cb->nlh, hdrlen)) 1012 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); 1013 1014 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc); 1015 } 1016 1017 static int inet_diag_type2proto(int type) 1018 { 1019 switch (type) { 1020 case TCPDIAG_GETSOCK: 1021 return IPPROTO_TCP; 1022 case DCCPDIAG_GETSOCK: 1023 return IPPROTO_DCCP; 1024 default: 1025 return 0; 1026 } 1027 } 1028 1029 static int inet_diag_dump_compat(struct sk_buff *skb, 1030 struct netlink_callback *cb) 1031 { 1032 struct inet_diag_req *rc = nlmsg_data(cb->nlh); 1033 int hdrlen = sizeof(struct inet_diag_req); 1034 struct inet_diag_req_v2 req; 1035 struct nlattr *bc = NULL; 1036 1037 req.sdiag_family = AF_UNSPEC; /* compatibility */ 1038 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type); 1039 req.idiag_ext = rc->idiag_ext; 1040 req.idiag_states = rc->idiag_states; 1041 req.id = rc->id; 1042 1043 if (nlmsg_attrlen(cb->nlh, hdrlen)) 1044 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); 1045 1046 return __inet_diag_dump(skb, cb, &req, bc); 1047 } 1048 1049 static int inet_diag_get_exact_compat(struct sk_buff *in_skb, 1050 const struct nlmsghdr *nlh) 1051 { 1052 struct inet_diag_req *rc = nlmsg_data(nlh); 1053 struct inet_diag_req_v2 req; 1054 1055 req.sdiag_family = rc->idiag_family; 1056 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type); 1057 req.idiag_ext = rc->idiag_ext; 1058 req.idiag_states = rc->idiag_states; 1059 req.id = rc->id; 1060 1061 return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req); 1062 } 1063 1064 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh) 1065 { 1066 int hdrlen = sizeof(struct inet_diag_req); 1067 struct net *net = sock_net(skb->sk); 1068 1069 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX || 1070 nlmsg_len(nlh) < hdrlen) 1071 return -EINVAL; 1072 1073 if (nlh->nlmsg_flags & NLM_F_DUMP) { 1074 if (nlmsg_attrlen(nlh, hdrlen)) { 1075 struct nlattr *attr; 1076 int err; 1077 1078 attr = nlmsg_find_attr(nlh, hdrlen, 1079 INET_DIAG_REQ_BYTECODE); 1080 err = inet_diag_bc_audit(attr, skb); 1081 if (err) 1082 return err; 1083 } 1084 { 1085 struct netlink_dump_control c = { 1086 .dump = inet_diag_dump_compat, 1087 }; 1088 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c); 1089 } 1090 } 1091 1092 return inet_diag_get_exact_compat(skb, nlh); 1093 } 1094 1095 static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h) 1096 { 1097 int hdrlen = sizeof(struct inet_diag_req_v2); 1098 struct net *net = sock_net(skb->sk); 1099 1100 if (nlmsg_len(h) < hdrlen) 1101 return -EINVAL; 1102 1103 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY && 1104 h->nlmsg_flags & NLM_F_DUMP) { 1105 if (nlmsg_attrlen(h, hdrlen)) { 1106 struct nlattr *attr; 1107 int err; 1108 1109 attr = nlmsg_find_attr(h, hdrlen, 1110 INET_DIAG_REQ_BYTECODE); 1111 err = inet_diag_bc_audit(attr, skb); 1112 if (err) 1113 return err; 1114 } 1115 { 1116 struct netlink_dump_control c = { 1117 .dump = inet_diag_dump, 1118 }; 1119 return netlink_dump_start(net->diag_nlsk, skb, h, &c); 1120 } 1121 } 1122 1123 return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h)); 1124 } 1125 1126 static 1127 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk) 1128 { 1129 const struct inet_diag_handler *handler; 1130 struct nlmsghdr *nlh; 1131 struct nlattr *attr; 1132 struct inet_diag_msg *r; 1133 void *info = NULL; 1134 int err = 0; 1135 1136 nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0); 1137 if (!nlh) 1138 return -ENOMEM; 1139 1140 r = nlmsg_data(nlh); 1141 memset(r, 0, sizeof(*r)); 1142 inet_diag_msg_common_fill(r, sk); 1143 if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM) 1144 r->id.idiag_sport = inet_sk(sk)->inet_sport; 1145 r->idiag_state = sk->sk_state; 1146 1147 if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) { 1148 nlmsg_cancel(skb, nlh); 1149 return err; 1150 } 1151 1152 handler = inet_diag_lock_handler(sk->sk_protocol); 1153 if (IS_ERR(handler)) { 1154 inet_diag_unlock_handler(handler); 1155 nlmsg_cancel(skb, nlh); 1156 return PTR_ERR(handler); 1157 } 1158 1159 attr = handler->idiag_info_size 1160 ? nla_reserve_64bit(skb, INET_DIAG_INFO, 1161 handler->idiag_info_size, 1162 INET_DIAG_PAD) 1163 : NULL; 1164 if (attr) 1165 info = nla_data(attr); 1166 1167 handler->idiag_get_info(sk, r, info); 1168 inet_diag_unlock_handler(handler); 1169 1170 nlmsg_end(skb, nlh); 1171 return 0; 1172 } 1173 1174 static const struct sock_diag_handler inet_diag_handler = { 1175 .family = AF_INET, 1176 .dump = inet_diag_handler_cmd, 1177 .get_info = inet_diag_handler_get_info, 1178 .destroy = inet_diag_handler_cmd, 1179 }; 1180 1181 static const struct sock_diag_handler inet6_diag_handler = { 1182 .family = AF_INET6, 1183 .dump = inet_diag_handler_cmd, 1184 .get_info = inet_diag_handler_get_info, 1185 .destroy = inet_diag_handler_cmd, 1186 }; 1187 1188 int inet_diag_register(const struct inet_diag_handler *h) 1189 { 1190 const __u16 type = h->idiag_type; 1191 int err = -EINVAL; 1192 1193 if (type >= IPPROTO_MAX) 1194 goto out; 1195 1196 mutex_lock(&inet_diag_table_mutex); 1197 err = -EEXIST; 1198 if (!inet_diag_table[type]) { 1199 inet_diag_table[type] = h; 1200 err = 0; 1201 } 1202 mutex_unlock(&inet_diag_table_mutex); 1203 out: 1204 return err; 1205 } 1206 EXPORT_SYMBOL_GPL(inet_diag_register); 1207 1208 void inet_diag_unregister(const struct inet_diag_handler *h) 1209 { 1210 const __u16 type = h->idiag_type; 1211 1212 if (type >= IPPROTO_MAX) 1213 return; 1214 1215 mutex_lock(&inet_diag_table_mutex); 1216 inet_diag_table[type] = NULL; 1217 mutex_unlock(&inet_diag_table_mutex); 1218 } 1219 EXPORT_SYMBOL_GPL(inet_diag_unregister); 1220 1221 static int __init inet_diag_init(void) 1222 { 1223 const int inet_diag_table_size = (IPPROTO_MAX * 1224 sizeof(struct inet_diag_handler *)); 1225 int err = -ENOMEM; 1226 1227 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL); 1228 if (!inet_diag_table) 1229 goto out; 1230 1231 err = sock_diag_register(&inet_diag_handler); 1232 if (err) 1233 goto out_free_nl; 1234 1235 err = sock_diag_register(&inet6_diag_handler); 1236 if (err) 1237 goto out_free_inet; 1238 1239 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat); 1240 out: 1241 return err; 1242 1243 out_free_inet: 1244 sock_diag_unregister(&inet_diag_handler); 1245 out_free_nl: 1246 kfree(inet_diag_table); 1247 goto out; 1248 } 1249 1250 static void __exit inet_diag_exit(void) 1251 { 1252 sock_diag_unregister(&inet6_diag_handler); 1253 sock_diag_unregister(&inet_diag_handler); 1254 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat); 1255 kfree(inet_diag_table); 1256 } 1257 1258 module_init(inet_diag_init); 1259 module_exit(inet_diag_exit); 1260 MODULE_LICENSE("GPL"); 1261 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */); 1262 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */); 1263