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 #define INET_DIAG_PUT(skb, attrtype, attrlen) \ 50 RTA_DATA(__RTA_PUT(skb, attrtype, attrlen)) 51 52 static DEFINE_MUTEX(inet_diag_table_mutex); 53 54 static const struct inet_diag_handler *inet_diag_lock_handler(int proto) 55 { 56 if (!inet_diag_table[proto]) 57 request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK, 58 NETLINK_SOCK_DIAG, proto); 59 60 mutex_lock(&inet_diag_table_mutex); 61 if (!inet_diag_table[proto]) 62 return ERR_PTR(-ENOENT); 63 64 return inet_diag_table[proto]; 65 } 66 67 static inline void inet_diag_unlock_handler( 68 const struct inet_diag_handler *handler) 69 { 70 mutex_unlock(&inet_diag_table_mutex); 71 } 72 73 static int inet_csk_diag_fill(struct sock *sk, 74 struct sk_buff *skb, struct inet_diag_req *req, 75 u32 pid, u32 seq, u16 nlmsg_flags, 76 const struct nlmsghdr *unlh) 77 { 78 const struct inet_sock *inet = inet_sk(sk); 79 const struct inet_connection_sock *icsk = inet_csk(sk); 80 struct inet_diag_msg *r; 81 struct nlmsghdr *nlh; 82 void *info = NULL; 83 struct inet_diag_meminfo *minfo = NULL; 84 unsigned char *b = skb_tail_pointer(skb); 85 const struct inet_diag_handler *handler; 86 int ext = req->idiag_ext; 87 88 handler = inet_diag_table[req->sdiag_protocol]; 89 BUG_ON(handler == NULL); 90 91 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); 92 nlh->nlmsg_flags = nlmsg_flags; 93 94 r = NLMSG_DATA(nlh); 95 BUG_ON(sk->sk_state == TCP_TIME_WAIT); 96 97 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) 98 minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo)); 99 100 if (ext & (1 << (INET_DIAG_INFO - 1))) 101 info = INET_DIAG_PUT(skb, INET_DIAG_INFO, 102 handler->idiag_info_size); 103 104 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) { 105 const size_t len = strlen(icsk->icsk_ca_ops->name); 106 107 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1), 108 icsk->icsk_ca_ops->name); 109 } 110 111 r->idiag_family = sk->sk_family; 112 r->idiag_state = sk->sk_state; 113 r->idiag_timer = 0; 114 r->idiag_retrans = 0; 115 116 r->id.idiag_if = sk->sk_bound_dev_if; 117 r->id.idiag_cookie[0] = (u32)(unsigned long)sk; 118 r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1); 119 120 r->id.idiag_sport = inet->inet_sport; 121 r->id.idiag_dport = inet->inet_dport; 122 r->id.idiag_src[0] = inet->inet_rcv_saddr; 123 r->id.idiag_dst[0] = inet->inet_daddr; 124 125 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections, 126 * hence this needs to be included regardless of socket family. 127 */ 128 if (ext & (1 << (INET_DIAG_TOS - 1))) 129 RTA_PUT_U8(skb, INET_DIAG_TOS, inet->tos); 130 131 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 132 if (r->idiag_family == AF_INET6) { 133 const struct ipv6_pinfo *np = inet6_sk(sk); 134 135 *(struct in6_addr *)r->id.idiag_src = np->rcv_saddr; 136 *(struct in6_addr *)r->id.idiag_dst = np->daddr; 137 if (ext & (1 << (INET_DIAG_TCLASS - 1))) 138 RTA_PUT_U8(skb, INET_DIAG_TCLASS, np->tclass); 139 } 140 #endif 141 142 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ) 143 144 if (icsk->icsk_pending == ICSK_TIME_RETRANS) { 145 r->idiag_timer = 1; 146 r->idiag_retrans = icsk->icsk_retransmits; 147 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 148 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { 149 r->idiag_timer = 4; 150 r->idiag_retrans = icsk->icsk_probes_out; 151 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 152 } else if (timer_pending(&sk->sk_timer)) { 153 r->idiag_timer = 2; 154 r->idiag_retrans = icsk->icsk_probes_out; 155 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires); 156 } else { 157 r->idiag_timer = 0; 158 r->idiag_expires = 0; 159 } 160 #undef EXPIRES_IN_MS 161 162 r->idiag_uid = sock_i_uid(sk); 163 r->idiag_inode = sock_i_ino(sk); 164 165 if (minfo) { 166 minfo->idiag_rmem = sk_rmem_alloc_get(sk); 167 minfo->idiag_wmem = sk->sk_wmem_queued; 168 minfo->idiag_fmem = sk->sk_forward_alloc; 169 minfo->idiag_tmem = sk_wmem_alloc_get(sk); 170 } 171 172 handler->idiag_get_info(sk, r, info); 173 174 if (sk->sk_state < TCP_TIME_WAIT && 175 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info) 176 icsk->icsk_ca_ops->get_info(sk, ext, skb); 177 178 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 179 return skb->len; 180 181 rtattr_failure: 182 nlmsg_failure: 183 nlmsg_trim(skb, b); 184 return -EMSGSIZE; 185 } 186 187 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw, 188 struct sk_buff *skb, struct inet_diag_req *req, 189 u32 pid, u32 seq, u16 nlmsg_flags, 190 const struct nlmsghdr *unlh) 191 { 192 long tmo; 193 struct inet_diag_msg *r; 194 const unsigned char *previous_tail = skb_tail_pointer(skb); 195 struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq, 196 unlh->nlmsg_type, sizeof(*r)); 197 198 r = NLMSG_DATA(nlh); 199 BUG_ON(tw->tw_state != TCP_TIME_WAIT); 200 201 nlh->nlmsg_flags = nlmsg_flags; 202 203 tmo = tw->tw_ttd - jiffies; 204 if (tmo < 0) 205 tmo = 0; 206 207 r->idiag_family = tw->tw_family; 208 r->idiag_retrans = 0; 209 r->id.idiag_if = tw->tw_bound_dev_if; 210 r->id.idiag_cookie[0] = (u32)(unsigned long)tw; 211 r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1); 212 r->id.idiag_sport = tw->tw_sport; 213 r->id.idiag_dport = tw->tw_dport; 214 r->id.idiag_src[0] = tw->tw_rcv_saddr; 215 r->id.idiag_dst[0] = tw->tw_daddr; 216 r->idiag_state = tw->tw_substate; 217 r->idiag_timer = 3; 218 r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ); 219 r->idiag_rqueue = 0; 220 r->idiag_wqueue = 0; 221 r->idiag_uid = 0; 222 r->idiag_inode = 0; 223 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 224 if (tw->tw_family == AF_INET6) { 225 const struct inet6_timewait_sock *tw6 = 226 inet6_twsk((struct sock *)tw); 227 228 *(struct in6_addr *)r->id.idiag_src = tw6->tw_v6_rcv_saddr; 229 *(struct in6_addr *)r->id.idiag_dst = tw6->tw_v6_daddr; 230 } 231 #endif 232 nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail; 233 return skb->len; 234 nlmsg_failure: 235 nlmsg_trim(skb, previous_tail); 236 return -EMSGSIZE; 237 } 238 239 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, 240 struct inet_diag_req *r, u32 pid, u32 seq, u16 nlmsg_flags, 241 const struct nlmsghdr *unlh) 242 { 243 if (sk->sk_state == TCP_TIME_WAIT) 244 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk, 245 skb, r, pid, seq, nlmsg_flags, 246 unlh); 247 return inet_csk_diag_fill(sk, skb, r, pid, seq, nlmsg_flags, unlh); 248 } 249 250 static int inet_diag_get_exact(struct sk_buff *in_skb, 251 const struct nlmsghdr *nlh, 252 struct inet_diag_req *req) 253 { 254 int err; 255 struct sock *sk; 256 struct sk_buff *rep; 257 struct inet_hashinfo *hashinfo; 258 const struct inet_diag_handler *handler; 259 260 handler = inet_diag_lock_handler(req->sdiag_protocol); 261 if (IS_ERR(handler)) { 262 err = PTR_ERR(handler); 263 goto unlock; 264 } 265 266 hashinfo = handler->idiag_hashinfo; 267 err = -EINVAL; 268 269 if (req->sdiag_family == AF_INET) { 270 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0], 271 req->id.idiag_dport, req->id.idiag_src[0], 272 req->id.idiag_sport, req->id.idiag_if); 273 } 274 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 275 else if (req->sdiag_family == AF_INET6) { 276 sk = inet6_lookup(&init_net, hashinfo, 277 (struct in6_addr *)req->id.idiag_dst, 278 req->id.idiag_dport, 279 (struct in6_addr *)req->id.idiag_src, 280 req->id.idiag_sport, 281 req->id.idiag_if); 282 } 283 #endif 284 else { 285 goto unlock; 286 } 287 288 err = -ENOENT; 289 if (sk == NULL) 290 goto unlock; 291 292 err = -ESTALE; 293 if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE || 294 req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) && 295 ((u32)(unsigned long)sk != req->id.idiag_cookie[0] || 296 (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1])) 297 goto out; 298 299 err = -ENOMEM; 300 rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) + 301 sizeof(struct inet_diag_meminfo) + 302 handler->idiag_info_size + 64)), 303 GFP_KERNEL); 304 if (!rep) 305 goto out; 306 307 err = sk_diag_fill(sk, rep, req, 308 NETLINK_CB(in_skb).pid, 309 nlh->nlmsg_seq, 0, nlh); 310 if (err < 0) { 311 WARN_ON(err == -EMSGSIZE); 312 kfree_skb(rep); 313 goto out; 314 } 315 err = netlink_unicast(sock_diag_nlsk, rep, NETLINK_CB(in_skb).pid, 316 MSG_DONTWAIT); 317 if (err > 0) 318 err = 0; 319 320 out: 321 if (sk) { 322 if (sk->sk_state == TCP_TIME_WAIT) 323 inet_twsk_put((struct inet_timewait_sock *)sk); 324 else 325 sock_put(sk); 326 } 327 unlock: 328 inet_diag_unlock_handler(handler); 329 return err; 330 } 331 332 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits) 333 { 334 int words = bits >> 5; 335 336 bits &= 0x1f; 337 338 if (words) { 339 if (memcmp(a1, a2, words << 2)) 340 return 0; 341 } 342 if (bits) { 343 __be32 w1, w2; 344 __be32 mask; 345 346 w1 = a1[words]; 347 w2 = a2[words]; 348 349 mask = htonl((0xffffffff) << (32 - bits)); 350 351 if ((w1 ^ w2) & mask) 352 return 0; 353 } 354 355 return 1; 356 } 357 358 359 static int inet_diag_bc_run(const void *bc, int len, 360 const struct inet_diag_entry *entry) 361 { 362 while (len > 0) { 363 int yes = 1; 364 const struct inet_diag_bc_op *op = bc; 365 366 switch (op->code) { 367 case INET_DIAG_BC_NOP: 368 break; 369 case INET_DIAG_BC_JMP: 370 yes = 0; 371 break; 372 case INET_DIAG_BC_S_GE: 373 yes = entry->sport >= op[1].no; 374 break; 375 case INET_DIAG_BC_S_LE: 376 yes = entry->sport <= op[1].no; 377 break; 378 case INET_DIAG_BC_D_GE: 379 yes = entry->dport >= op[1].no; 380 break; 381 case INET_DIAG_BC_D_LE: 382 yes = entry->dport <= op[1].no; 383 break; 384 case INET_DIAG_BC_AUTO: 385 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); 386 break; 387 case INET_DIAG_BC_S_COND: 388 case INET_DIAG_BC_D_COND: { 389 struct inet_diag_hostcond *cond; 390 __be32 *addr; 391 392 cond = (struct inet_diag_hostcond *)(op + 1); 393 if (cond->port != -1 && 394 cond->port != (op->code == INET_DIAG_BC_S_COND ? 395 entry->sport : entry->dport)) { 396 yes = 0; 397 break; 398 } 399 400 if (cond->prefix_len == 0) 401 break; 402 403 if (op->code == INET_DIAG_BC_S_COND) 404 addr = entry->saddr; 405 else 406 addr = entry->daddr; 407 408 if (bitstring_match(addr, cond->addr, 409 cond->prefix_len)) 410 break; 411 if (entry->family == AF_INET6 && 412 cond->family == AF_INET) { 413 if (addr[0] == 0 && addr[1] == 0 && 414 addr[2] == htonl(0xffff) && 415 bitstring_match(addr + 3, cond->addr, 416 cond->prefix_len)) 417 break; 418 } 419 yes = 0; 420 break; 421 } 422 } 423 424 if (yes) { 425 len -= op->yes; 426 bc += op->yes; 427 } else { 428 len -= op->no; 429 bc += op->no; 430 } 431 } 432 return len == 0; 433 } 434 435 static int valid_cc(const void *bc, int len, int cc) 436 { 437 while (len >= 0) { 438 const struct inet_diag_bc_op *op = bc; 439 440 if (cc > len) 441 return 0; 442 if (cc == len) 443 return 1; 444 if (op->yes < 4 || op->yes & 3) 445 return 0; 446 len -= op->yes; 447 bc += op->yes; 448 } 449 return 0; 450 } 451 452 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len) 453 { 454 const void *bc = bytecode; 455 int len = bytecode_len; 456 457 while (len > 0) { 458 const struct inet_diag_bc_op *op = bc; 459 460 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len); 461 switch (op->code) { 462 case INET_DIAG_BC_AUTO: 463 case INET_DIAG_BC_S_COND: 464 case INET_DIAG_BC_D_COND: 465 case INET_DIAG_BC_S_GE: 466 case INET_DIAG_BC_S_LE: 467 case INET_DIAG_BC_D_GE: 468 case INET_DIAG_BC_D_LE: 469 case INET_DIAG_BC_JMP: 470 if (op->no < 4 || op->no > len + 4 || op->no & 3) 471 return -EINVAL; 472 if (op->no < len && 473 !valid_cc(bytecode, bytecode_len, len - op->no)) 474 return -EINVAL; 475 break; 476 case INET_DIAG_BC_NOP: 477 break; 478 default: 479 return -EINVAL; 480 } 481 if (op->yes < 4 || op->yes > len + 4 || op->yes & 3) 482 return -EINVAL; 483 bc += op->yes; 484 len -= op->yes; 485 } 486 return len == 0 ? 0 : -EINVAL; 487 } 488 489 static int inet_csk_diag_dump(struct sock *sk, 490 struct sk_buff *skb, 491 struct netlink_callback *cb, 492 struct inet_diag_req *r, 493 const struct nlattr *bc) 494 { 495 if (bc != NULL) { 496 struct inet_diag_entry entry; 497 struct inet_sock *inet = inet_sk(sk); 498 499 entry.family = sk->sk_family; 500 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 501 if (entry.family == AF_INET6) { 502 struct ipv6_pinfo *np = inet6_sk(sk); 503 504 entry.saddr = np->rcv_saddr.s6_addr32; 505 entry.daddr = np->daddr.s6_addr32; 506 } else 507 #endif 508 { 509 entry.saddr = &inet->inet_rcv_saddr; 510 entry.daddr = &inet->inet_daddr; 511 } 512 entry.sport = inet->inet_num; 513 entry.dport = ntohs(inet->inet_dport); 514 entry.userlocks = sk->sk_userlocks; 515 516 if (!inet_diag_bc_run(nla_data(bc), nla_len(bc), &entry)) 517 return 0; 518 } 519 520 return inet_csk_diag_fill(sk, skb, r, 521 NETLINK_CB(cb->skb).pid, 522 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 523 } 524 525 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw, 526 struct sk_buff *skb, 527 struct netlink_callback *cb, 528 struct inet_diag_req *r, 529 const struct nlattr *bc) 530 { 531 if (bc != NULL) { 532 struct inet_diag_entry entry; 533 534 entry.family = tw->tw_family; 535 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 536 if (tw->tw_family == AF_INET6) { 537 struct inet6_timewait_sock *tw6 = 538 inet6_twsk((struct sock *)tw); 539 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32; 540 entry.daddr = tw6->tw_v6_daddr.s6_addr32; 541 } else 542 #endif 543 { 544 entry.saddr = &tw->tw_rcv_saddr; 545 entry.daddr = &tw->tw_daddr; 546 } 547 entry.sport = tw->tw_num; 548 entry.dport = ntohs(tw->tw_dport); 549 entry.userlocks = 0; 550 551 if (!inet_diag_bc_run(nla_data(bc), nla_len(bc), &entry)) 552 return 0; 553 } 554 555 return inet_twsk_diag_fill(tw, skb, r, 556 NETLINK_CB(cb->skb).pid, 557 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 558 } 559 560 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk, 561 struct request_sock *req, u32 pid, u32 seq, 562 const struct nlmsghdr *unlh) 563 { 564 const struct inet_request_sock *ireq = inet_rsk(req); 565 struct inet_sock *inet = inet_sk(sk); 566 unsigned char *b = skb_tail_pointer(skb); 567 struct inet_diag_msg *r; 568 struct nlmsghdr *nlh; 569 long tmo; 570 571 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); 572 nlh->nlmsg_flags = NLM_F_MULTI; 573 r = NLMSG_DATA(nlh); 574 575 r->idiag_family = sk->sk_family; 576 r->idiag_state = TCP_SYN_RECV; 577 r->idiag_timer = 1; 578 r->idiag_retrans = req->retrans; 579 580 r->id.idiag_if = sk->sk_bound_dev_if; 581 r->id.idiag_cookie[0] = (u32)(unsigned long)req; 582 r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1); 583 584 tmo = req->expires - jiffies; 585 if (tmo < 0) 586 tmo = 0; 587 588 r->id.idiag_sport = inet->inet_sport; 589 r->id.idiag_dport = ireq->rmt_port; 590 r->id.idiag_src[0] = ireq->loc_addr; 591 r->id.idiag_dst[0] = ireq->rmt_addr; 592 r->idiag_expires = jiffies_to_msecs(tmo); 593 r->idiag_rqueue = 0; 594 r->idiag_wqueue = 0; 595 r->idiag_uid = sock_i_uid(sk); 596 r->idiag_inode = 0; 597 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 598 if (r->idiag_family == AF_INET6) { 599 *(struct in6_addr *)r->id.idiag_src = inet6_rsk(req)->loc_addr; 600 *(struct in6_addr *)r->id.idiag_dst = inet6_rsk(req)->rmt_addr; 601 } 602 #endif 603 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 604 605 return skb->len; 606 607 nlmsg_failure: 608 nlmsg_trim(skb, b); 609 return -1; 610 } 611 612 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk, 613 struct netlink_callback *cb, 614 struct inet_diag_req *r, 615 const struct nlattr *bc) 616 { 617 struct inet_diag_entry entry; 618 struct inet_connection_sock *icsk = inet_csk(sk); 619 struct listen_sock *lopt; 620 struct inet_sock *inet = inet_sk(sk); 621 int j, s_j; 622 int reqnum, s_reqnum; 623 int err = 0; 624 625 s_j = cb->args[3]; 626 s_reqnum = cb->args[4]; 627 628 if (s_j > 0) 629 s_j--; 630 631 entry.family = sk->sk_family; 632 633 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 634 635 lopt = icsk->icsk_accept_queue.listen_opt; 636 if (!lopt || !lopt->qlen) 637 goto out; 638 639 if (bc != NULL) { 640 entry.sport = inet->inet_num; 641 entry.userlocks = sk->sk_userlocks; 642 } 643 644 for (j = s_j; j < lopt->nr_table_entries; j++) { 645 struct request_sock *req, *head = lopt->syn_table[j]; 646 647 reqnum = 0; 648 for (req = head; req; reqnum++, req = req->dl_next) { 649 struct inet_request_sock *ireq = inet_rsk(req); 650 651 if (reqnum < s_reqnum) 652 continue; 653 if (r->id.idiag_dport != ireq->rmt_port && 654 r->id.idiag_dport) 655 continue; 656 657 if (bc) { 658 entry.saddr = 659 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 660 (entry.family == AF_INET6) ? 661 inet6_rsk(req)->loc_addr.s6_addr32 : 662 #endif 663 &ireq->loc_addr; 664 entry.daddr = 665 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 666 (entry.family == AF_INET6) ? 667 inet6_rsk(req)->rmt_addr.s6_addr32 : 668 #endif 669 &ireq->rmt_addr; 670 entry.dport = ntohs(ireq->rmt_port); 671 672 if (!inet_diag_bc_run(nla_data(bc), 673 nla_len(bc), &entry)) 674 continue; 675 } 676 677 err = inet_diag_fill_req(skb, sk, req, 678 NETLINK_CB(cb->skb).pid, 679 cb->nlh->nlmsg_seq, cb->nlh); 680 if (err < 0) { 681 cb->args[3] = j + 1; 682 cb->args[4] = reqnum; 683 goto out; 684 } 685 } 686 687 s_reqnum = 0; 688 } 689 690 out: 691 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 692 693 return err; 694 } 695 696 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, 697 struct inet_diag_req *r, struct nlattr *bc) 698 { 699 int i, num; 700 int s_i, s_num; 701 const struct inet_diag_handler *handler; 702 struct inet_hashinfo *hashinfo; 703 704 handler = inet_diag_lock_handler(r->sdiag_protocol); 705 if (IS_ERR(handler)) 706 goto unlock; 707 708 hashinfo = handler->idiag_hashinfo; 709 710 s_i = cb->args[1]; 711 s_num = num = cb->args[2]; 712 713 if (cb->args[0] == 0) { 714 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV))) 715 goto skip_listen_ht; 716 717 for (i = s_i; i < INET_LHTABLE_SIZE; i++) { 718 struct sock *sk; 719 struct hlist_nulls_node *node; 720 struct inet_listen_hashbucket *ilb; 721 722 num = 0; 723 ilb = &hashinfo->listening_hash[i]; 724 spin_lock_bh(&ilb->lock); 725 sk_nulls_for_each(sk, node, &ilb->head) { 726 struct inet_sock *inet = inet_sk(sk); 727 728 if (num < s_num) { 729 num++; 730 continue; 731 } 732 733 if (r->sdiag_family != AF_UNSPEC && 734 sk->sk_family != r->sdiag_family) 735 goto next_listen; 736 737 if (r->id.idiag_sport != inet->inet_sport && 738 r->id.idiag_sport) 739 goto next_listen; 740 741 if (!(r->idiag_states & TCPF_LISTEN) || 742 r->id.idiag_dport || 743 cb->args[3] > 0) 744 goto syn_recv; 745 746 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) { 747 spin_unlock_bh(&ilb->lock); 748 goto done; 749 } 750 751 syn_recv: 752 if (!(r->idiag_states & TCPF_SYN_RECV)) 753 goto next_listen; 754 755 if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) { 756 spin_unlock_bh(&ilb->lock); 757 goto done; 758 } 759 760 next_listen: 761 cb->args[3] = 0; 762 cb->args[4] = 0; 763 ++num; 764 } 765 spin_unlock_bh(&ilb->lock); 766 767 s_num = 0; 768 cb->args[3] = 0; 769 cb->args[4] = 0; 770 } 771 skip_listen_ht: 772 cb->args[0] = 1; 773 s_i = num = s_num = 0; 774 } 775 776 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV))) 777 goto unlock; 778 779 for (i = s_i; i <= hashinfo->ehash_mask; i++) { 780 struct inet_ehash_bucket *head = &hashinfo->ehash[i]; 781 spinlock_t *lock = inet_ehash_lockp(hashinfo, i); 782 struct sock *sk; 783 struct hlist_nulls_node *node; 784 785 num = 0; 786 787 if (hlist_nulls_empty(&head->chain) && 788 hlist_nulls_empty(&head->twchain)) 789 continue; 790 791 if (i > s_i) 792 s_num = 0; 793 794 spin_lock_bh(lock); 795 sk_nulls_for_each(sk, node, &head->chain) { 796 struct inet_sock *inet = inet_sk(sk); 797 798 if (num < s_num) 799 goto next_normal; 800 if (!(r->idiag_states & (1 << sk->sk_state))) 801 goto next_normal; 802 if (r->sdiag_family != AF_UNSPEC && 803 sk->sk_family != r->sdiag_family) 804 goto next_normal; 805 if (r->id.idiag_sport != inet->inet_sport && 806 r->id.idiag_sport) 807 goto next_normal; 808 if (r->id.idiag_dport != inet->inet_dport && 809 r->id.idiag_dport) 810 goto next_normal; 811 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) { 812 spin_unlock_bh(lock); 813 goto done; 814 } 815 next_normal: 816 ++num; 817 } 818 819 if (r->idiag_states & TCPF_TIME_WAIT) { 820 struct inet_timewait_sock *tw; 821 822 inet_twsk_for_each(tw, node, 823 &head->twchain) { 824 825 if (num < s_num) 826 goto next_dying; 827 if (r->sdiag_family != AF_UNSPEC && 828 tw->tw_family != r->sdiag_family) 829 goto next_dying; 830 if (r->id.idiag_sport != tw->tw_sport && 831 r->id.idiag_sport) 832 goto next_dying; 833 if (r->id.idiag_dport != tw->tw_dport && 834 r->id.idiag_dport) 835 goto next_dying; 836 if (inet_twsk_diag_dump(tw, skb, cb, r, bc) < 0) { 837 spin_unlock_bh(lock); 838 goto done; 839 } 840 next_dying: 841 ++num; 842 } 843 } 844 spin_unlock_bh(lock); 845 } 846 847 done: 848 cb->args[1] = i; 849 cb->args[2] = num; 850 unlock: 851 inet_diag_unlock_handler(handler); 852 return skb->len; 853 } 854 855 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) 856 { 857 struct nlattr *bc = NULL; 858 int hdrlen = sizeof(struct inet_diag_req); 859 860 if (nlmsg_attrlen(cb->nlh, hdrlen)) 861 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); 862 863 return __inet_diag_dump(skb, cb, (struct inet_diag_req *)NLMSG_DATA(cb->nlh), bc); 864 } 865 866 static inline int inet_diag_type2proto(int type) 867 { 868 switch (type) { 869 case TCPDIAG_GETSOCK: 870 return IPPROTO_TCP; 871 case DCCPDIAG_GETSOCK: 872 return IPPROTO_DCCP; 873 default: 874 return 0; 875 } 876 } 877 878 static int inet_diag_dump_compat(struct sk_buff *skb, struct netlink_callback *cb) 879 { 880 struct inet_diag_req_compat *rc = NLMSG_DATA(cb->nlh); 881 struct inet_diag_req req; 882 struct nlattr *bc = NULL; 883 int hdrlen = sizeof(struct inet_diag_req_compat); 884 885 req.sdiag_family = AF_UNSPEC; /* compatibility */ 886 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type); 887 req.idiag_ext = rc->idiag_ext; 888 req.idiag_states = rc->idiag_states; 889 req.id = rc->id; 890 891 if (nlmsg_attrlen(cb->nlh, hdrlen)) 892 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE); 893 894 return __inet_diag_dump(skb, cb, &req, bc); 895 } 896 897 static int inet_diag_get_exact_compat(struct sk_buff *in_skb, 898 const struct nlmsghdr *nlh) 899 { 900 struct inet_diag_req_compat *rc = NLMSG_DATA(nlh); 901 struct inet_diag_req req; 902 903 req.sdiag_family = rc->idiag_family; 904 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type); 905 req.idiag_ext = rc->idiag_ext; 906 req.idiag_states = rc->idiag_states; 907 req.id = rc->id; 908 909 return inet_diag_get_exact(in_skb, nlh, &req); 910 } 911 912 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh) 913 { 914 int hdrlen = sizeof(struct inet_diag_req_compat); 915 916 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX || 917 nlmsg_len(nlh) < hdrlen) 918 return -EINVAL; 919 920 if (nlh->nlmsg_flags & NLM_F_DUMP) { 921 if (nlmsg_attrlen(nlh, hdrlen)) { 922 struct nlattr *attr; 923 924 attr = nlmsg_find_attr(nlh, hdrlen, 925 INET_DIAG_REQ_BYTECODE); 926 if (attr == NULL || 927 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 928 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 929 return -EINVAL; 930 } 931 932 return netlink_dump_start(sock_diag_nlsk, skb, nlh, 933 inet_diag_dump_compat, NULL, 0); 934 } 935 936 return inet_diag_get_exact_compat(skb, nlh); 937 } 938 939 static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h) 940 { 941 int hdrlen = sizeof(struct inet_diag_req); 942 943 if (nlmsg_len(h) < hdrlen) 944 return -EINVAL; 945 946 if (h->nlmsg_flags & NLM_F_DUMP) { 947 if (nlmsg_attrlen(h, hdrlen)) { 948 struct nlattr *attr; 949 attr = nlmsg_find_attr(h, hdrlen, 950 INET_DIAG_REQ_BYTECODE); 951 if (attr == NULL || 952 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 953 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 954 return -EINVAL; 955 } 956 957 return netlink_dump_start(sock_diag_nlsk, skb, h, 958 inet_diag_dump, NULL, 0); 959 } 960 961 return inet_diag_get_exact(skb, h, (struct inet_diag_req *)NLMSG_DATA(h)); 962 } 963 964 static struct sock_diag_handler inet_diag_handler = { 965 .family = AF_INET, 966 .dump = inet_diag_handler_dump, 967 }; 968 969 static struct sock_diag_handler inet6_diag_handler = { 970 .family = AF_INET6, 971 .dump = inet_diag_handler_dump, 972 }; 973 974 int inet_diag_register(const struct inet_diag_handler *h) 975 { 976 const __u16 type = h->idiag_type; 977 int err = -EINVAL; 978 979 if (type >= IPPROTO_MAX) 980 goto out; 981 982 mutex_lock(&inet_diag_table_mutex); 983 err = -EEXIST; 984 if (inet_diag_table[type] == NULL) { 985 inet_diag_table[type] = h; 986 err = 0; 987 } 988 mutex_unlock(&inet_diag_table_mutex); 989 out: 990 return err; 991 } 992 EXPORT_SYMBOL_GPL(inet_diag_register); 993 994 void inet_diag_unregister(const struct inet_diag_handler *h) 995 { 996 const __u16 type = h->idiag_type; 997 998 if (type >= IPPROTO_MAX) 999 return; 1000 1001 mutex_lock(&inet_diag_table_mutex); 1002 inet_diag_table[type] = NULL; 1003 mutex_unlock(&inet_diag_table_mutex); 1004 } 1005 EXPORT_SYMBOL_GPL(inet_diag_unregister); 1006 1007 static int __init inet_diag_init(void) 1008 { 1009 const int inet_diag_table_size = (IPPROTO_MAX * 1010 sizeof(struct inet_diag_handler *)); 1011 int err = -ENOMEM; 1012 1013 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL); 1014 if (!inet_diag_table) 1015 goto out; 1016 1017 err = sock_diag_register(&inet_diag_handler); 1018 if (err) 1019 goto out_free_nl; 1020 1021 err = sock_diag_register(&inet6_diag_handler); 1022 if (err) 1023 goto out_free_inet; 1024 1025 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat); 1026 out: 1027 return err; 1028 1029 out_free_inet: 1030 sock_diag_unregister(&inet_diag_handler); 1031 out_free_nl: 1032 kfree(inet_diag_table); 1033 goto out; 1034 } 1035 1036 static void __exit inet_diag_exit(void) 1037 { 1038 sock_diag_unregister(&inet6_diag_handler); 1039 sock_diag_unregister(&inet_diag_handler); 1040 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat); 1041 kfree(inet_diag_table); 1042 } 1043 1044 module_init(inet_diag_init); 1045 module_exit(inet_diag_exit); 1046 MODULE_LICENSE("GPL"); 1047 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 0); 1048