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