1 /* 2 * inet_diag.c Module for monitoring INET transport protocols sockets. 3 * 4 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11 12 #include <linux/kernel.h> 13 #include <linux/module.h> 14 #include <linux/types.h> 15 #include <linux/fcntl.h> 16 #include <linux/random.h> 17 #include <linux/slab.h> 18 #include <linux/cache.h> 19 #include <linux/init.h> 20 #include <linux/time.h> 21 22 #include <net/icmp.h> 23 #include <net/tcp.h> 24 #include <net/ipv6.h> 25 #include <net/inet_common.h> 26 #include <net/inet_connection_sock.h> 27 #include <net/inet_hashtables.h> 28 #include <net/inet_timewait_sock.h> 29 #include <net/inet6_hashtables.h> 30 #include <net/netlink.h> 31 32 #include <linux/inet.h> 33 #include <linux/stddef.h> 34 35 #include <linux/inet_diag.h> 36 #include <linux/sock_diag.h> 37 38 static const struct inet_diag_handler **inet_diag_table; 39 40 struct inet_diag_entry { 41 __be32 *saddr; 42 __be32 *daddr; 43 u16 sport; 44 u16 dport; 45 u16 family; 46 u16 userlocks; 47 }; 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 inline void inet_diag_unlock_handler( 65 const struct inet_diag_handler *handler) 66 { 67 mutex_unlock(&inet_diag_table_mutex); 68 } 69 70 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk, 71 struct sk_buff *skb, struct inet_diag_req_v2 *req, 72 u32 pid, u32 seq, u16 nlmsg_flags, 73 const struct nlmsghdr *unlh) 74 { 75 const struct inet_sock *inet = inet_sk(sk); 76 struct inet_diag_msg *r; 77 struct nlmsghdr *nlh; 78 struct nlattr *attr; 79 void *info = NULL; 80 const struct inet_diag_handler *handler; 81 int ext = req->idiag_ext; 82 83 handler = inet_diag_table[req->sdiag_protocol]; 84 BUG_ON(handler == NULL); 85 86 nlh = nlmsg_put(skb, pid, seq, unlh->nlmsg_type, sizeof(*r), 87 nlmsg_flags); 88 if (!nlh) 89 return -EMSGSIZE; 90 91 r = nlmsg_data(nlh); 92 BUG_ON(sk->sk_state == TCP_TIME_WAIT); 93 94 r->idiag_family = sk->sk_family; 95 r->idiag_state = sk->sk_state; 96 r->idiag_timer = 0; 97 r->idiag_retrans = 0; 98 99 r->id.idiag_if = sk->sk_bound_dev_if; 100 sock_diag_save_cookie(sk, r->id.idiag_cookie); 101 102 r->id.idiag_sport = inet->inet_sport; 103 r->id.idiag_dport = inet->inet_dport; 104 r->id.idiag_src[0] = inet->inet_rcv_saddr; 105 r->id.idiag_dst[0] = inet->inet_daddr; 106 107 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections, 108 * hence this needs to be included regardless of socket family. 109 */ 110 if (ext & (1 << (INET_DIAG_TOS - 1))) 111 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0) 112 goto errout; 113 114 #if IS_ENABLED(CONFIG_IPV6) 115 if (r->idiag_family == AF_INET6) { 116 const struct ipv6_pinfo *np = inet6_sk(sk); 117 118 *(struct in6_addr *)r->id.idiag_src = np->rcv_saddr; 119 *(struct in6_addr *)r->id.idiag_dst = np->daddr; 120 121 if (ext & (1 << (INET_DIAG_TCLASS - 1))) 122 if (nla_put_u8(skb, INET_DIAG_TCLASS, np->tclass) < 0) 123 goto errout; 124 } 125 #endif 126 127 r->idiag_uid = sock_i_uid(sk); 128 r->idiag_inode = sock_i_ino(sk); 129 130 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) { 131 struct inet_diag_meminfo minfo = { 132 .idiag_rmem = sk_rmem_alloc_get(sk), 133 .idiag_wmem = sk->sk_wmem_queued, 134 .idiag_fmem = sk->sk_forward_alloc, 135 .idiag_tmem = sk_wmem_alloc_get(sk), 136 }; 137 138 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0) 139 goto errout; 140 } 141 142 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1))) 143 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO)) 144 goto errout; 145 146 if (icsk == NULL) { 147 handler->idiag_get_info(sk, r, NULL); 148 goto out; 149 } 150 151 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ) 152 153 if (icsk->icsk_pending == ICSK_TIME_RETRANS) { 154 r->idiag_timer = 1; 155 r->idiag_retrans = icsk->icsk_retransmits; 156 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 157 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { 158 r->idiag_timer = 4; 159 r->idiag_retrans = icsk->icsk_probes_out; 160 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 161 } else if (timer_pending(&sk->sk_timer)) { 162 r->idiag_timer = 2; 163 r->idiag_retrans = icsk->icsk_probes_out; 164 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires); 165 } else { 166 r->idiag_timer = 0; 167 r->idiag_expires = 0; 168 } 169 #undef EXPIRES_IN_MS 170 171 if (ext & (1 << (INET_DIAG_INFO - 1))) { 172 attr = nla_reserve(skb, INET_DIAG_INFO, 173 sizeof(struct tcp_info)); 174 if (!attr) 175 goto errout; 176 177 info = nla_data(attr); 178 } 179 180 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) 181 if (nla_put_string(skb, INET_DIAG_CONG, 182 icsk->icsk_ca_ops->name) < 0) 183 goto errout; 184 185 handler->idiag_get_info(sk, r, info); 186 187 if (sk->sk_state < TCP_TIME_WAIT && 188 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info) 189 icsk->icsk_ca_ops->get_info(sk, ext, skb); 190 191 out: 192 return nlmsg_end(skb, nlh); 193 194 errout: 195 nlmsg_cancel(skb, nlh); 196 return -EMSGSIZE; 197 } 198 EXPORT_SYMBOL_GPL(inet_sk_diag_fill); 199 200 static int inet_csk_diag_fill(struct sock *sk, 201 struct sk_buff *skb, struct inet_diag_req_v2 *req, 202 u32 pid, u32 seq, u16 nlmsg_flags, 203 const struct nlmsghdr *unlh) 204 { 205 return inet_sk_diag_fill(sk, inet_csk(sk), 206 skb, req, pid, seq, nlmsg_flags, unlh); 207 } 208 209 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw, 210 struct sk_buff *skb, struct inet_diag_req_v2 *req, 211 u32 pid, u32 seq, u16 nlmsg_flags, 212 const struct nlmsghdr *unlh) 213 { 214 long tmo; 215 struct inet_diag_msg *r; 216 struct nlmsghdr *nlh; 217 218 nlh = nlmsg_put(skb, pid, seq, unlh->nlmsg_type, sizeof(*r), 219 nlmsg_flags); 220 if (!nlh) 221 return -EMSGSIZE; 222 223 r = nlmsg_data(nlh); 224 BUG_ON(tw->tw_state != TCP_TIME_WAIT); 225 226 tmo = tw->tw_ttd - jiffies; 227 if (tmo < 0) 228 tmo = 0; 229 230 r->idiag_family = tw->tw_family; 231 r->idiag_retrans = 0; 232 r->id.idiag_if = tw->tw_bound_dev_if; 233 sock_diag_save_cookie(tw, r->id.idiag_cookie); 234 r->id.idiag_sport = tw->tw_sport; 235 r->id.idiag_dport = tw->tw_dport; 236 r->id.idiag_src[0] = tw->tw_rcv_saddr; 237 r->id.idiag_dst[0] = tw->tw_daddr; 238 r->idiag_state = tw->tw_substate; 239 r->idiag_timer = 3; 240 r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ); 241 r->idiag_rqueue = 0; 242 r->idiag_wqueue = 0; 243 r->idiag_uid = 0; 244 r->idiag_inode = 0; 245 #if IS_ENABLED(CONFIG_IPV6) 246 if (tw->tw_family == AF_INET6) { 247 const struct inet6_timewait_sock *tw6 = 248 inet6_twsk((struct sock *)tw); 249 250 *(struct in6_addr *)r->id.idiag_src = tw6->tw_v6_rcv_saddr; 251 *(struct in6_addr *)r->id.idiag_dst = tw6->tw_v6_daddr; 252 } 253 #endif 254 255 return nlmsg_end(skb, nlh); 256 } 257 258 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, 259 struct inet_diag_req_v2 *r, u32 pid, u32 seq, u16 nlmsg_flags, 260 const struct nlmsghdr *unlh) 261 { 262 if (sk->sk_state == TCP_TIME_WAIT) 263 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk, 264 skb, r, pid, seq, nlmsg_flags, 265 unlh); 266 return inet_csk_diag_fill(sk, skb, r, pid, seq, nlmsg_flags, unlh); 267 } 268 269 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_skb, 270 const struct nlmsghdr *nlh, struct inet_diag_req_v2 *req) 271 { 272 int err; 273 struct sock *sk; 274 struct sk_buff *rep; 275 struct net *net = sock_net(in_skb->sk); 276 277 err = -EINVAL; 278 if (req->sdiag_family == AF_INET) { 279 sk = inet_lookup(net, hashinfo, req->id.idiag_dst[0], 280 req->id.idiag_dport, req->id.idiag_src[0], 281 req->id.idiag_sport, req->id.idiag_if); 282 } 283 #if IS_ENABLED(CONFIG_IPV6) 284 else if (req->sdiag_family == AF_INET6) { 285 sk = inet6_lookup(net, hashinfo, 286 (struct in6_addr *)req->id.idiag_dst, 287 req->id.idiag_dport, 288 (struct in6_addr *)req->id.idiag_src, 289 req->id.idiag_sport, 290 req->id.idiag_if); 291 } 292 #endif 293 else { 294 goto out_nosk; 295 } 296 297 err = -ENOENT; 298 if (sk == NULL) 299 goto out_nosk; 300 301 err = sock_diag_check_cookie(sk, req->id.idiag_cookie); 302 if (err) 303 goto out; 304 305 rep = nlmsg_new(sizeof(struct inet_diag_msg) + 306 sizeof(struct inet_diag_meminfo) + 307 sizeof(struct tcp_info) + 64, GFP_KERNEL); 308 if (!rep) { 309 err = -ENOMEM; 310 goto out; 311 } 312 313 err = sk_diag_fill(sk, rep, req, 314 NETLINK_CB(in_skb).pid, 315 nlh->nlmsg_seq, 0, nlh); 316 if (err < 0) { 317 WARN_ON(err == -EMSGSIZE); 318 nlmsg_free(rep); 319 goto out; 320 } 321 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).pid, 322 MSG_DONTWAIT); 323 if (err > 0) 324 err = 0; 325 326 out: 327 if (sk) { 328 if (sk->sk_state == TCP_TIME_WAIT) 329 inet_twsk_put((struct inet_timewait_sock *)sk); 330 else 331 sock_put(sk); 332 } 333 out_nosk: 334 return err; 335 } 336 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk); 337 338 static int inet_diag_get_exact(struct sk_buff *in_skb, 339 const struct nlmsghdr *nlh, 340 struct inet_diag_req_v2 *req) 341 { 342 const struct inet_diag_handler *handler; 343 int err; 344 345 handler = inet_diag_lock_handler(req->sdiag_protocol); 346 if (IS_ERR(handler)) 347 err = PTR_ERR(handler); 348 else 349 err = handler->dump_one(in_skb, nlh, req); 350 inet_diag_unlock_handler(handler); 351 352 return err; 353 } 354 355 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits) 356 { 357 int words = bits >> 5; 358 359 bits &= 0x1f; 360 361 if (words) { 362 if (memcmp(a1, a2, words << 2)) 363 return 0; 364 } 365 if (bits) { 366 __be32 w1, w2; 367 __be32 mask; 368 369 w1 = a1[words]; 370 w2 = a2[words]; 371 372 mask = htonl((0xffffffff) << (32 - bits)); 373 374 if ((w1 ^ w2) & mask) 375 return 0; 376 } 377 378 return 1; 379 } 380 381 382 static int inet_diag_bc_run(const struct nlattr *_bc, 383 const struct inet_diag_entry *entry) 384 { 385 const void *bc = nla_data(_bc); 386 int len = nla_len(_bc); 387 388 while (len > 0) { 389 int yes = 1; 390 const struct inet_diag_bc_op *op = bc; 391 392 switch (op->code) { 393 case INET_DIAG_BC_NOP: 394 break; 395 case INET_DIAG_BC_JMP: 396 yes = 0; 397 break; 398 case INET_DIAG_BC_S_GE: 399 yes = entry->sport >= op[1].no; 400 break; 401 case INET_DIAG_BC_S_LE: 402 yes = entry->sport <= op[1].no; 403 break; 404 case INET_DIAG_BC_D_GE: 405 yes = entry->dport >= op[1].no; 406 break; 407 case INET_DIAG_BC_D_LE: 408 yes = entry->dport <= op[1].no; 409 break; 410 case INET_DIAG_BC_AUTO: 411 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); 412 break; 413 case INET_DIAG_BC_S_COND: 414 case INET_DIAG_BC_D_COND: { 415 struct inet_diag_hostcond *cond; 416 __be32 *addr; 417 418 cond = (struct inet_diag_hostcond *)(op + 1); 419 if (cond->port != -1 && 420 cond->port != (op->code == INET_DIAG_BC_S_COND ? 421 entry->sport : entry->dport)) { 422 yes = 0; 423 break; 424 } 425 426 if (cond->prefix_len == 0) 427 break; 428 429 if (op->code == INET_DIAG_BC_S_COND) 430 addr = entry->saddr; 431 else 432 addr = entry->daddr; 433 434 if (bitstring_match(addr, cond->addr, 435 cond->prefix_len)) 436 break; 437 if (entry->family == AF_INET6 && 438 cond->family == AF_INET) { 439 if (addr[0] == 0 && addr[1] == 0 && 440 addr[2] == htonl(0xffff) && 441 bitstring_match(addr + 3, cond->addr, 442 cond->prefix_len)) 443 break; 444 } 445 yes = 0; 446 break; 447 } 448 } 449 450 if (yes) { 451 len -= op->yes; 452 bc += op->yes; 453 } else { 454 len -= op->no; 455 bc += op->no; 456 } 457 } 458 return len == 0; 459 } 460 461 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk) 462 { 463 struct inet_diag_entry entry; 464 struct inet_sock *inet = inet_sk(sk); 465 466 if (bc == NULL) 467 return 1; 468 469 entry.family = sk->sk_family; 470 #if IS_ENABLED(CONFIG_IPV6) 471 if (entry.family == AF_INET6) { 472 struct ipv6_pinfo *np = inet6_sk(sk); 473 474 entry.saddr = np->rcv_saddr.s6_addr32; 475 entry.daddr = np->daddr.s6_addr32; 476 } else 477 #endif 478 { 479 entry.saddr = &inet->inet_rcv_saddr; 480 entry.daddr = &inet->inet_daddr; 481 } 482 entry.sport = inet->inet_num; 483 entry.dport = ntohs(inet->inet_dport); 484 entry.userlocks = sk->sk_userlocks; 485 486 return inet_diag_bc_run(bc, &entry); 487 } 488 EXPORT_SYMBOL_GPL(inet_diag_bc_sk); 489 490 static int valid_cc(const void *bc, int len, int cc) 491 { 492 while (len >= 0) { 493 const struct inet_diag_bc_op *op = bc; 494 495 if (cc > len) 496 return 0; 497 if (cc == len) 498 return 1; 499 if (op->yes < 4 || op->yes & 3) 500 return 0; 501 len -= op->yes; 502 bc += op->yes; 503 } 504 return 0; 505 } 506 507 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len) 508 { 509 const void *bc = bytecode; 510 int len = bytecode_len; 511 512 while (len > 0) { 513 const struct inet_diag_bc_op *op = bc; 514 515 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len); 516 switch (op->code) { 517 case INET_DIAG_BC_AUTO: 518 case INET_DIAG_BC_S_COND: 519 case INET_DIAG_BC_D_COND: 520 case INET_DIAG_BC_S_GE: 521 case INET_DIAG_BC_S_LE: 522 case INET_DIAG_BC_D_GE: 523 case INET_DIAG_BC_D_LE: 524 case INET_DIAG_BC_JMP: 525 if (op->no < 4 || op->no > len + 4 || op->no & 3) 526 return -EINVAL; 527 if (op->no < len && 528 !valid_cc(bytecode, bytecode_len, len - op->no)) 529 return -EINVAL; 530 break; 531 case INET_DIAG_BC_NOP: 532 break; 533 default: 534 return -EINVAL; 535 } 536 if (op->yes < 4 || op->yes > len + 4 || op->yes & 3) 537 return -EINVAL; 538 bc += op->yes; 539 len -= op->yes; 540 } 541 return len == 0 ? 0 : -EINVAL; 542 } 543 544 static int inet_csk_diag_dump(struct sock *sk, 545 struct sk_buff *skb, 546 struct netlink_callback *cb, 547 struct inet_diag_req_v2 *r, 548 const struct nlattr *bc) 549 { 550 if (!inet_diag_bc_sk(bc, sk)) 551 return 0; 552 553 return inet_csk_diag_fill(sk, skb, r, 554 NETLINK_CB(cb->skb).pid, 555 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 556 } 557 558 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw, 559 struct sk_buff *skb, 560 struct netlink_callback *cb, 561 struct inet_diag_req_v2 *r, 562 const struct nlattr *bc) 563 { 564 if (bc != NULL) { 565 struct inet_diag_entry entry; 566 567 entry.family = tw->tw_family; 568 #if IS_ENABLED(CONFIG_IPV6) 569 if (tw->tw_family == AF_INET6) { 570 struct inet6_timewait_sock *tw6 = 571 inet6_twsk((struct sock *)tw); 572 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32; 573 entry.daddr = tw6->tw_v6_daddr.s6_addr32; 574 } else 575 #endif 576 { 577 entry.saddr = &tw->tw_rcv_saddr; 578 entry.daddr = &tw->tw_daddr; 579 } 580 entry.sport = tw->tw_num; 581 entry.dport = ntohs(tw->tw_dport); 582 entry.userlocks = 0; 583 584 if (!inet_diag_bc_run(bc, &entry)) 585 return 0; 586 } 587 588 return inet_twsk_diag_fill(tw, skb, r, 589 NETLINK_CB(cb->skb).pid, 590 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 591 } 592 593 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk, 594 struct request_sock *req, u32 pid, u32 seq, 595 const struct nlmsghdr *unlh) 596 { 597 const struct inet_request_sock *ireq = inet_rsk(req); 598 struct inet_sock *inet = inet_sk(sk); 599 struct inet_diag_msg *r; 600 struct nlmsghdr *nlh; 601 long tmo; 602 603 nlh = nlmsg_put(skb, pid, seq, unlh->nlmsg_type, sizeof(*r), 604 NLM_F_MULTI); 605 if (!nlh) 606 return -EMSGSIZE; 607 608 r = nlmsg_data(nlh); 609 r->idiag_family = sk->sk_family; 610 r->idiag_state = TCP_SYN_RECV; 611 r->idiag_timer = 1; 612 r->idiag_retrans = req->retrans; 613 614 r->id.idiag_if = sk->sk_bound_dev_if; 615 sock_diag_save_cookie(req, r->id.idiag_cookie); 616 617 tmo = req->expires - jiffies; 618 if (tmo < 0) 619 tmo = 0; 620 621 r->id.idiag_sport = inet->inet_sport; 622 r->id.idiag_dport = ireq->rmt_port; 623 r->id.idiag_src[0] = ireq->loc_addr; 624 r->id.idiag_dst[0] = ireq->rmt_addr; 625 r->idiag_expires = jiffies_to_msecs(tmo); 626 r->idiag_rqueue = 0; 627 r->idiag_wqueue = 0; 628 r->idiag_uid = sock_i_uid(sk); 629 r->idiag_inode = 0; 630 #if IS_ENABLED(CONFIG_IPV6) 631 if (r->idiag_family == AF_INET6) { 632 *(struct in6_addr *)r->id.idiag_src = inet6_rsk(req)->loc_addr; 633 *(struct in6_addr *)r->id.idiag_dst = inet6_rsk(req)->rmt_addr; 634 } 635 #endif 636 637 return nlmsg_end(skb, nlh); 638 } 639 640 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk, 641 struct netlink_callback *cb, 642 struct inet_diag_req_v2 *r, 643 const struct nlattr *bc) 644 { 645 struct inet_diag_entry entry; 646 struct inet_connection_sock *icsk = inet_csk(sk); 647 struct listen_sock *lopt; 648 struct inet_sock *inet = inet_sk(sk); 649 int j, s_j; 650 int reqnum, s_reqnum; 651 int err = 0; 652 653 s_j = cb->args[3]; 654 s_reqnum = cb->args[4]; 655 656 if (s_j > 0) 657 s_j--; 658 659 entry.family = sk->sk_family; 660 661 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 662 663 lopt = icsk->icsk_accept_queue.listen_opt; 664 if (!lopt || !lopt->qlen) 665 goto out; 666 667 if (bc != NULL) { 668 entry.sport = inet->inet_num; 669 entry.userlocks = sk->sk_userlocks; 670 } 671 672 for (j = s_j; j < lopt->nr_table_entries; j++) { 673 struct request_sock *req, *head = lopt->syn_table[j]; 674 675 reqnum = 0; 676 for (req = head; req; reqnum++, req = req->dl_next) { 677 struct inet_request_sock *ireq = inet_rsk(req); 678 679 if (reqnum < s_reqnum) 680 continue; 681 if (r->id.idiag_dport != ireq->rmt_port && 682 r->id.idiag_dport) 683 continue; 684 685 if (bc) { 686 entry.saddr = 687 #if IS_ENABLED(CONFIG_IPV6) 688 (entry.family == AF_INET6) ? 689 inet6_rsk(req)->loc_addr.s6_addr32 : 690 #endif 691 &ireq->loc_addr; 692 entry.daddr = 693 #if IS_ENABLED(CONFIG_IPV6) 694 (entry.family == AF_INET6) ? 695 inet6_rsk(req)->rmt_addr.s6_addr32 : 696 #endif 697 &ireq->rmt_addr; 698 entry.dport = ntohs(ireq->rmt_port); 699 700 if (!inet_diag_bc_run(bc, &entry)) 701 continue; 702 } 703 704 err = inet_diag_fill_req(skb, sk, req, 705 NETLINK_CB(cb->skb).pid, 706 cb->nlh->nlmsg_seq, cb->nlh); 707 if (err < 0) { 708 cb->args[3] = j + 1; 709 cb->args[4] = reqnum; 710 goto out; 711 } 712 } 713 714 s_reqnum = 0; 715 } 716 717 out: 718 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 719 720 return err; 721 } 722 723 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb, 724 struct netlink_callback *cb, struct inet_diag_req_v2 *r, struct nlattr *bc) 725 { 726 int i, num; 727 int s_i, s_num; 728 struct net *net = sock_net(skb->sk); 729 730 s_i = cb->args[1]; 731 s_num = num = cb->args[2]; 732 733 if (cb->args[0] == 0) { 734 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV))) 735 goto skip_listen_ht; 736 737 for (i = s_i; i < INET_LHTABLE_SIZE; i++) { 738 struct sock *sk; 739 struct hlist_nulls_node *node; 740 struct inet_listen_hashbucket *ilb; 741 742 num = 0; 743 ilb = &hashinfo->listening_hash[i]; 744 spin_lock_bh(&ilb->lock); 745 sk_nulls_for_each(sk, node, &ilb->head) { 746 struct inet_sock *inet = inet_sk(sk); 747 748 if (!net_eq(sock_net(sk), net)) 749 continue; 750 751 if (num < s_num) { 752 num++; 753 continue; 754 } 755 756 if (r->sdiag_family != AF_UNSPEC && 757 sk->sk_family != r->sdiag_family) 758 goto next_listen; 759 760 if (r->id.idiag_sport != inet->inet_sport && 761 r->id.idiag_sport) 762 goto next_listen; 763 764 if (!(r->idiag_states & TCPF_LISTEN) || 765 r->id.idiag_dport || 766 cb->args[3] > 0) 767 goto syn_recv; 768 769 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) { 770 spin_unlock_bh(&ilb->lock); 771 goto done; 772 } 773 774 syn_recv: 775 if (!(r->idiag_states & TCPF_SYN_RECV)) 776 goto next_listen; 777 778 if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) { 779 spin_unlock_bh(&ilb->lock); 780 goto done; 781 } 782 783 next_listen: 784 cb->args[3] = 0; 785 cb->args[4] = 0; 786 ++num; 787 } 788 spin_unlock_bh(&ilb->lock); 789 790 s_num = 0; 791 cb->args[3] = 0; 792 cb->args[4] = 0; 793 } 794 skip_listen_ht: 795 cb->args[0] = 1; 796 s_i = num = s_num = 0; 797 } 798 799 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV))) 800 goto out; 801 802 for (i = s_i; i <= hashinfo->ehash_mask; i++) { 803 struct inet_ehash_bucket *head = &hashinfo->ehash[i]; 804 spinlock_t *lock = inet_ehash_lockp(hashinfo, i); 805 struct sock *sk; 806 struct hlist_nulls_node *node; 807 808 num = 0; 809 810 if (hlist_nulls_empty(&head->chain) && 811 hlist_nulls_empty(&head->twchain)) 812 continue; 813 814 if (i > s_i) 815 s_num = 0; 816 817 spin_lock_bh(lock); 818 sk_nulls_for_each(sk, node, &head->chain) { 819 struct inet_sock *inet = inet_sk(sk); 820 821 if (!net_eq(sock_net(sk), net)) 822 continue; 823 if (num < s_num) 824 goto next_normal; 825 if (!(r->idiag_states & (1 << sk->sk_state))) 826 goto next_normal; 827 if (r->sdiag_family != AF_UNSPEC && 828 sk->sk_family != r->sdiag_family) 829 goto next_normal; 830 if (r->id.idiag_sport != inet->inet_sport && 831 r->id.idiag_sport) 832 goto next_normal; 833 if (r->id.idiag_dport != inet->inet_dport && 834 r->id.idiag_dport) 835 goto next_normal; 836 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) { 837 spin_unlock_bh(lock); 838 goto done; 839 } 840 next_normal: 841 ++num; 842 } 843 844 if (r->idiag_states & TCPF_TIME_WAIT) { 845 struct inet_timewait_sock *tw; 846 847 inet_twsk_for_each(tw, node, 848 &head->twchain) { 849 if (!net_eq(twsk_net(tw), net)) 850 continue; 851 852 if (num < s_num) 853 goto next_dying; 854 if (r->sdiag_family != AF_UNSPEC && 855 tw->tw_family != r->sdiag_family) 856 goto next_dying; 857 if (r->id.idiag_sport != tw->tw_sport && 858 r->id.idiag_sport) 859 goto next_dying; 860 if (r->id.idiag_dport != tw->tw_dport && 861 r->id.idiag_dport) 862 goto next_dying; 863 if (inet_twsk_diag_dump(tw, skb, cb, r, bc) < 0) { 864 spin_unlock_bh(lock); 865 goto done; 866 } 867 next_dying: 868 ++num; 869 } 870 } 871 spin_unlock_bh(lock); 872 } 873 874 done: 875 cb->args[1] = i; 876 cb->args[2] = num; 877 out: 878 ; 879 } 880 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk); 881 882 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, 883 struct inet_diag_req_v2 *r, struct nlattr *bc) 884 { 885 const struct inet_diag_handler *handler; 886 887 handler = inet_diag_lock_handler(r->sdiag_protocol); 888 if (!IS_ERR(handler)) 889 handler->dump(skb, cb, r, bc); 890 inet_diag_unlock_handler(handler); 891 892 return skb->len; 893 } 894 895 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) 896 { 897 struct nlattr *bc = NULL; 898 int hdrlen = sizeof(struct inet_diag_req_v2); 899 900 if (nlmsg_attrlen(cb->nlh, hdrlen)) 901 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); 902 903 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc); 904 } 905 906 static inline int inet_diag_type2proto(int type) 907 { 908 switch (type) { 909 case TCPDIAG_GETSOCK: 910 return IPPROTO_TCP; 911 case DCCPDIAG_GETSOCK: 912 return IPPROTO_DCCP; 913 default: 914 return 0; 915 } 916 } 917 918 static int inet_diag_dump_compat(struct sk_buff *skb, struct netlink_callback *cb) 919 { 920 struct inet_diag_req *rc = nlmsg_data(cb->nlh); 921 struct inet_diag_req_v2 req; 922 struct nlattr *bc = NULL; 923 int hdrlen = sizeof(struct inet_diag_req); 924 925 req.sdiag_family = AF_UNSPEC; /* compatibility */ 926 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type); 927 req.idiag_ext = rc->idiag_ext; 928 req.idiag_states = rc->idiag_states; 929 req.id = rc->id; 930 931 if (nlmsg_attrlen(cb->nlh, hdrlen)) 932 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); 933 934 return __inet_diag_dump(skb, cb, &req, bc); 935 } 936 937 static int inet_diag_get_exact_compat(struct sk_buff *in_skb, 938 const struct nlmsghdr *nlh) 939 { 940 struct inet_diag_req *rc = nlmsg_data(nlh); 941 struct inet_diag_req_v2 req; 942 943 req.sdiag_family = rc->idiag_family; 944 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type); 945 req.idiag_ext = rc->idiag_ext; 946 req.idiag_states = rc->idiag_states; 947 req.id = rc->id; 948 949 return inet_diag_get_exact(in_skb, nlh, &req); 950 } 951 952 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh) 953 { 954 int hdrlen = sizeof(struct inet_diag_req); 955 struct net *net = sock_net(skb->sk); 956 957 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX || 958 nlmsg_len(nlh) < hdrlen) 959 return -EINVAL; 960 961 if (nlh->nlmsg_flags & NLM_F_DUMP) { 962 if (nlmsg_attrlen(nlh, hdrlen)) { 963 struct nlattr *attr; 964 965 attr = nlmsg_find_attr(nlh, hdrlen, 966 INET_DIAG_REQ_BYTECODE); 967 if (attr == NULL || 968 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 969 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 970 return -EINVAL; 971 } 972 { 973 struct netlink_dump_control c = { 974 .dump = inet_diag_dump_compat, 975 }; 976 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c); 977 } 978 } 979 980 return inet_diag_get_exact_compat(skb, nlh); 981 } 982 983 static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h) 984 { 985 int hdrlen = sizeof(struct inet_diag_req_v2); 986 struct net *net = sock_net(skb->sk); 987 988 if (nlmsg_len(h) < hdrlen) 989 return -EINVAL; 990 991 if (h->nlmsg_flags & NLM_F_DUMP) { 992 if (nlmsg_attrlen(h, hdrlen)) { 993 struct nlattr *attr; 994 attr = nlmsg_find_attr(h, hdrlen, 995 INET_DIAG_REQ_BYTECODE); 996 if (attr == NULL || 997 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 998 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 999 return -EINVAL; 1000 } 1001 { 1002 struct netlink_dump_control c = { 1003 .dump = inet_diag_dump, 1004 }; 1005 return netlink_dump_start(net->diag_nlsk, skb, h, &c); 1006 } 1007 } 1008 1009 return inet_diag_get_exact(skb, h, nlmsg_data(h)); 1010 } 1011 1012 static const struct sock_diag_handler inet_diag_handler = { 1013 .family = AF_INET, 1014 .dump = inet_diag_handler_dump, 1015 }; 1016 1017 static const struct sock_diag_handler inet6_diag_handler = { 1018 .family = AF_INET6, 1019 .dump = inet_diag_handler_dump, 1020 }; 1021 1022 int inet_diag_register(const struct inet_diag_handler *h) 1023 { 1024 const __u16 type = h->idiag_type; 1025 int err = -EINVAL; 1026 1027 if (type >= IPPROTO_MAX) 1028 goto out; 1029 1030 mutex_lock(&inet_diag_table_mutex); 1031 err = -EEXIST; 1032 if (inet_diag_table[type] == NULL) { 1033 inet_diag_table[type] = h; 1034 err = 0; 1035 } 1036 mutex_unlock(&inet_diag_table_mutex); 1037 out: 1038 return err; 1039 } 1040 EXPORT_SYMBOL_GPL(inet_diag_register); 1041 1042 void inet_diag_unregister(const struct inet_diag_handler *h) 1043 { 1044 const __u16 type = h->idiag_type; 1045 1046 if (type >= IPPROTO_MAX) 1047 return; 1048 1049 mutex_lock(&inet_diag_table_mutex); 1050 inet_diag_table[type] = NULL; 1051 mutex_unlock(&inet_diag_table_mutex); 1052 } 1053 EXPORT_SYMBOL_GPL(inet_diag_unregister); 1054 1055 static int __init inet_diag_init(void) 1056 { 1057 const int inet_diag_table_size = (IPPROTO_MAX * 1058 sizeof(struct inet_diag_handler *)); 1059 int err = -ENOMEM; 1060 1061 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL); 1062 if (!inet_diag_table) 1063 goto out; 1064 1065 err = sock_diag_register(&inet_diag_handler); 1066 if (err) 1067 goto out_free_nl; 1068 1069 err = sock_diag_register(&inet6_diag_handler); 1070 if (err) 1071 goto out_free_inet; 1072 1073 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat); 1074 out: 1075 return err; 1076 1077 out_free_inet: 1078 sock_diag_unregister(&inet_diag_handler); 1079 out_free_nl: 1080 kfree(inet_diag_table); 1081 goto out; 1082 } 1083 1084 static void __exit inet_diag_exit(void) 1085 { 1086 sock_diag_unregister(&inet6_diag_handler); 1087 sock_diag_unregister(&inet_diag_handler); 1088 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat); 1089 kfree(inet_diag_table); 1090 } 1091 1092 module_init(inet_diag_init); 1093 module_exit(inet_diag_exit); 1094 MODULE_LICENSE("GPL"); 1095 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */); 1096 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */); 1097