1 /* 2 * inet_diag.c Module for monitoring INET transport protocols sockets. 3 * 4 * Version: $Id: inet_diag.c,v 1.3 2002/02/01 22:01:04 davem Exp $ 5 * 6 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License 10 * as published by the Free Software Foundation; either version 11 * 2 of the License, or (at your option) any later version. 12 */ 13 14 #include <linux/kernel.h> 15 #include <linux/module.h> 16 #include <linux/types.h> 17 #include <linux/fcntl.h> 18 #include <linux/random.h> 19 #include <linux/cache.h> 20 #include <linux/init.h> 21 #include <linux/time.h> 22 23 #include <net/icmp.h> 24 #include <net/tcp.h> 25 #include <net/ipv6.h> 26 #include <net/inet_common.h> 27 #include <net/inet_connection_sock.h> 28 #include <net/inet_hashtables.h> 29 #include <net/inet_timewait_sock.h> 30 #include <net/inet6_hashtables.h> 31 #include <net/netlink.h> 32 33 #include <linux/inet.h> 34 #include <linux/stddef.h> 35 36 #include <linux/inet_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 struct sock *idiagnl; 50 51 #define INET_DIAG_PUT(skb, attrtype, attrlen) \ 52 RTA_DATA(__RTA_PUT(skb, attrtype, attrlen)) 53 54 static int inet_csk_diag_fill(struct sock *sk, 55 struct sk_buff *skb, 56 int ext, u32 pid, u32 seq, u16 nlmsg_flags, 57 const struct nlmsghdr *unlh) 58 { 59 const struct inet_sock *inet = inet_sk(sk); 60 const struct inet_connection_sock *icsk = inet_csk(sk); 61 struct inet_diag_msg *r; 62 struct nlmsghdr *nlh; 63 void *info = NULL; 64 struct inet_diag_meminfo *minfo = NULL; 65 unsigned char *b = skb_tail_pointer(skb); 66 const struct inet_diag_handler *handler; 67 68 handler = inet_diag_table[unlh->nlmsg_type]; 69 BUG_ON(handler == NULL); 70 71 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); 72 nlh->nlmsg_flags = nlmsg_flags; 73 74 r = NLMSG_DATA(nlh); 75 BUG_ON(sk->sk_state == TCP_TIME_WAIT); 76 77 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) 78 minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo)); 79 80 if (ext & (1 << (INET_DIAG_INFO - 1))) 81 info = INET_DIAG_PUT(skb, INET_DIAG_INFO, 82 handler->idiag_info_size); 83 84 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) { 85 const size_t len = strlen(icsk->icsk_ca_ops->name); 86 87 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1), 88 icsk->icsk_ca_ops->name); 89 } 90 91 r->idiag_family = sk->sk_family; 92 r->idiag_state = sk->sk_state; 93 r->idiag_timer = 0; 94 r->idiag_retrans = 0; 95 96 r->id.idiag_if = sk->sk_bound_dev_if; 97 r->id.idiag_cookie[0] = (u32)(unsigned long)sk; 98 r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1); 99 100 r->id.idiag_sport = inet->sport; 101 r->id.idiag_dport = inet->dport; 102 r->id.idiag_src[0] = inet->rcv_saddr; 103 r->id.idiag_dst[0] = inet->daddr; 104 105 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 106 if (r->idiag_family == AF_INET6) { 107 struct ipv6_pinfo *np = inet6_sk(sk); 108 109 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, 110 &np->rcv_saddr); 111 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, 112 &np->daddr); 113 } 114 #endif 115 116 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ) 117 118 if (icsk->icsk_pending == ICSK_TIME_RETRANS) { 119 r->idiag_timer = 1; 120 r->idiag_retrans = icsk->icsk_retransmits; 121 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 122 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { 123 r->idiag_timer = 4; 124 r->idiag_retrans = icsk->icsk_probes_out; 125 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 126 } else if (timer_pending(&sk->sk_timer)) { 127 r->idiag_timer = 2; 128 r->idiag_retrans = icsk->icsk_probes_out; 129 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires); 130 } else { 131 r->idiag_timer = 0; 132 r->idiag_expires = 0; 133 } 134 #undef EXPIRES_IN_MS 135 136 r->idiag_uid = sock_i_uid(sk); 137 r->idiag_inode = sock_i_ino(sk); 138 139 if (minfo) { 140 minfo->idiag_rmem = atomic_read(&sk->sk_rmem_alloc); 141 minfo->idiag_wmem = sk->sk_wmem_queued; 142 minfo->idiag_fmem = sk->sk_forward_alloc; 143 minfo->idiag_tmem = atomic_read(&sk->sk_wmem_alloc); 144 } 145 146 handler->idiag_get_info(sk, r, info); 147 148 if (sk->sk_state < TCP_TIME_WAIT && 149 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info) 150 icsk->icsk_ca_ops->get_info(sk, ext, skb); 151 152 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 153 return skb->len; 154 155 rtattr_failure: 156 nlmsg_failure: 157 nlmsg_trim(skb, b); 158 return -EMSGSIZE; 159 } 160 161 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw, 162 struct sk_buff *skb, int ext, u32 pid, 163 u32 seq, u16 nlmsg_flags, 164 const struct nlmsghdr *unlh) 165 { 166 long tmo; 167 struct inet_diag_msg *r; 168 const unsigned char *previous_tail = skb_tail_pointer(skb); 169 struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq, 170 unlh->nlmsg_type, sizeof(*r)); 171 172 r = NLMSG_DATA(nlh); 173 BUG_ON(tw->tw_state != TCP_TIME_WAIT); 174 175 nlh->nlmsg_flags = nlmsg_flags; 176 177 tmo = tw->tw_ttd - jiffies; 178 if (tmo < 0) 179 tmo = 0; 180 181 r->idiag_family = tw->tw_family; 182 r->idiag_state = tw->tw_state; 183 r->idiag_timer = 0; 184 r->idiag_retrans = 0; 185 r->id.idiag_if = tw->tw_bound_dev_if; 186 r->id.idiag_cookie[0] = (u32)(unsigned long)tw; 187 r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1); 188 r->id.idiag_sport = tw->tw_sport; 189 r->id.idiag_dport = tw->tw_dport; 190 r->id.idiag_src[0] = tw->tw_rcv_saddr; 191 r->id.idiag_dst[0] = tw->tw_daddr; 192 r->idiag_state = tw->tw_substate; 193 r->idiag_timer = 3; 194 r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ); 195 r->idiag_rqueue = 0; 196 r->idiag_wqueue = 0; 197 r->idiag_uid = 0; 198 r->idiag_inode = 0; 199 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 200 if (tw->tw_family == AF_INET6) { 201 const struct inet6_timewait_sock *tw6 = 202 inet6_twsk((struct sock *)tw); 203 204 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, 205 &tw6->tw_v6_rcv_saddr); 206 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, 207 &tw6->tw_v6_daddr); 208 } 209 #endif 210 nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail; 211 return skb->len; 212 nlmsg_failure: 213 nlmsg_trim(skb, previous_tail); 214 return -EMSGSIZE; 215 } 216 217 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, 218 int ext, u32 pid, u32 seq, u16 nlmsg_flags, 219 const struct nlmsghdr *unlh) 220 { 221 if (sk->sk_state == TCP_TIME_WAIT) 222 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk, 223 skb, ext, pid, seq, nlmsg_flags, 224 unlh); 225 return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh); 226 } 227 228 static int inet_diag_get_exact(struct sk_buff *in_skb, 229 const struct nlmsghdr *nlh) 230 { 231 int err; 232 struct sock *sk; 233 struct inet_diag_req *req = NLMSG_DATA(nlh); 234 struct sk_buff *rep; 235 struct inet_hashinfo *hashinfo; 236 const struct inet_diag_handler *handler; 237 238 handler = inet_diag_table[nlh->nlmsg_type]; 239 BUG_ON(handler == NULL); 240 hashinfo = handler->idiag_hashinfo; 241 242 if (req->idiag_family == AF_INET) { 243 sk = inet_lookup(hashinfo, req->id.idiag_dst[0], 244 req->id.idiag_dport, req->id.idiag_src[0], 245 req->id.idiag_sport, req->id.idiag_if); 246 } 247 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 248 else if (req->idiag_family == AF_INET6) { 249 sk = inet6_lookup(hashinfo, 250 (struct in6_addr *)req->id.idiag_dst, 251 req->id.idiag_dport, 252 (struct in6_addr *)req->id.idiag_src, 253 req->id.idiag_sport, 254 req->id.idiag_if); 255 } 256 #endif 257 else { 258 return -EINVAL; 259 } 260 261 if (sk == NULL) 262 return -ENOENT; 263 264 err = -ESTALE; 265 if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE || 266 req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) && 267 ((u32)(unsigned long)sk != req->id.idiag_cookie[0] || 268 (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1])) 269 goto out; 270 271 err = -ENOMEM; 272 rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) + 273 sizeof(struct inet_diag_meminfo) + 274 handler->idiag_info_size + 64)), 275 GFP_KERNEL); 276 if (!rep) 277 goto out; 278 279 err = sk_diag_fill(sk, rep, req->idiag_ext, 280 NETLINK_CB(in_skb).pid, 281 nlh->nlmsg_seq, 0, nlh); 282 if (err < 0) { 283 WARN_ON(err == -EMSGSIZE); 284 kfree_skb(rep); 285 goto out; 286 } 287 err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid, 288 MSG_DONTWAIT); 289 if (err > 0) 290 err = 0; 291 292 out: 293 if (sk) { 294 if (sk->sk_state == TCP_TIME_WAIT) 295 inet_twsk_put((struct inet_timewait_sock *)sk); 296 else 297 sock_put(sk); 298 } 299 return err; 300 } 301 302 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits) 303 { 304 int words = bits >> 5; 305 306 bits &= 0x1f; 307 308 if (words) { 309 if (memcmp(a1, a2, words << 2)) 310 return 0; 311 } 312 if (bits) { 313 __be32 w1, w2; 314 __be32 mask; 315 316 w1 = a1[words]; 317 w2 = a2[words]; 318 319 mask = htonl((0xffffffff) << (32 - bits)); 320 321 if ((w1 ^ w2) & mask) 322 return 0; 323 } 324 325 return 1; 326 } 327 328 329 static int inet_diag_bc_run(const void *bc, int len, 330 const struct inet_diag_entry *entry) 331 { 332 while (len > 0) { 333 int yes = 1; 334 const struct inet_diag_bc_op *op = bc; 335 336 switch (op->code) { 337 case INET_DIAG_BC_NOP: 338 break; 339 case INET_DIAG_BC_JMP: 340 yes = 0; 341 break; 342 case INET_DIAG_BC_S_GE: 343 yes = entry->sport >= op[1].no; 344 break; 345 case INET_DIAG_BC_S_LE: 346 yes = entry->dport <= op[1].no; 347 break; 348 case INET_DIAG_BC_D_GE: 349 yes = entry->dport >= op[1].no; 350 break; 351 case INET_DIAG_BC_D_LE: 352 yes = entry->dport <= op[1].no; 353 break; 354 case INET_DIAG_BC_AUTO: 355 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); 356 break; 357 case INET_DIAG_BC_S_COND: 358 case INET_DIAG_BC_D_COND: { 359 struct inet_diag_hostcond *cond; 360 __be32 *addr; 361 362 cond = (struct inet_diag_hostcond *)(op + 1); 363 if (cond->port != -1 && 364 cond->port != (op->code == INET_DIAG_BC_S_COND ? 365 entry->sport : entry->dport)) { 366 yes = 0; 367 break; 368 } 369 370 if (cond->prefix_len == 0) 371 break; 372 373 if (op->code == INET_DIAG_BC_S_COND) 374 addr = entry->saddr; 375 else 376 addr = entry->daddr; 377 378 if (bitstring_match(addr, cond->addr, 379 cond->prefix_len)) 380 break; 381 if (entry->family == AF_INET6 && 382 cond->family == AF_INET) { 383 if (addr[0] == 0 && addr[1] == 0 && 384 addr[2] == htonl(0xffff) && 385 bitstring_match(addr + 3, cond->addr, 386 cond->prefix_len)) 387 break; 388 } 389 yes = 0; 390 break; 391 } 392 } 393 394 if (yes) { 395 len -= op->yes; 396 bc += op->yes; 397 } else { 398 len -= op->no; 399 bc += op->no; 400 } 401 } 402 return (len == 0); 403 } 404 405 static int valid_cc(const void *bc, int len, int cc) 406 { 407 while (len >= 0) { 408 const struct inet_diag_bc_op *op = bc; 409 410 if (cc > len) 411 return 0; 412 if (cc == len) 413 return 1; 414 if (op->yes < 4) 415 return 0; 416 len -= op->yes; 417 bc += op->yes; 418 } 419 return 0; 420 } 421 422 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len) 423 { 424 const unsigned char *bc = bytecode; 425 int len = bytecode_len; 426 427 while (len > 0) { 428 struct inet_diag_bc_op *op = (struct inet_diag_bc_op *)bc; 429 430 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len); 431 switch (op->code) { 432 case INET_DIAG_BC_AUTO: 433 case INET_DIAG_BC_S_COND: 434 case INET_DIAG_BC_D_COND: 435 case INET_DIAG_BC_S_GE: 436 case INET_DIAG_BC_S_LE: 437 case INET_DIAG_BC_D_GE: 438 case INET_DIAG_BC_D_LE: 439 if (op->yes < 4 || op->yes > len + 4) 440 return -EINVAL; 441 case INET_DIAG_BC_JMP: 442 if (op->no < 4 || op->no > len + 4) 443 return -EINVAL; 444 if (op->no < len && 445 !valid_cc(bytecode, bytecode_len, len - op->no)) 446 return -EINVAL; 447 break; 448 case INET_DIAG_BC_NOP: 449 if (op->yes < 4 || op->yes > len + 4) 450 return -EINVAL; 451 break; 452 default: 453 return -EINVAL; 454 } 455 bc += op->yes; 456 len -= op->yes; 457 } 458 return len == 0 ? 0 : -EINVAL; 459 } 460 461 static int inet_csk_diag_dump(struct sock *sk, 462 struct sk_buff *skb, 463 struct netlink_callback *cb) 464 { 465 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 466 467 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { 468 struct inet_diag_entry entry; 469 struct rtattr *bc = (struct rtattr *)(r + 1); 470 struct inet_sock *inet = inet_sk(sk); 471 472 entry.family = sk->sk_family; 473 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 474 if (entry.family == AF_INET6) { 475 struct ipv6_pinfo *np = inet6_sk(sk); 476 477 entry.saddr = np->rcv_saddr.s6_addr32; 478 entry.daddr = np->daddr.s6_addr32; 479 } else 480 #endif 481 { 482 entry.saddr = &inet->rcv_saddr; 483 entry.daddr = &inet->daddr; 484 } 485 entry.sport = inet->num; 486 entry.dport = ntohs(inet->dport); 487 entry.userlocks = sk->sk_userlocks; 488 489 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry)) 490 return 0; 491 } 492 493 return inet_csk_diag_fill(sk, skb, r->idiag_ext, 494 NETLINK_CB(cb->skb).pid, 495 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 496 } 497 498 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw, 499 struct sk_buff *skb, 500 struct netlink_callback *cb) 501 { 502 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 503 504 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { 505 struct inet_diag_entry entry; 506 struct rtattr *bc = (struct rtattr *)(r + 1); 507 508 entry.family = tw->tw_family; 509 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 510 if (tw->tw_family == AF_INET6) { 511 struct inet6_timewait_sock *tw6 = 512 inet6_twsk((struct sock *)tw); 513 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32; 514 entry.daddr = tw6->tw_v6_daddr.s6_addr32; 515 } else 516 #endif 517 { 518 entry.saddr = &tw->tw_rcv_saddr; 519 entry.daddr = &tw->tw_daddr; 520 } 521 entry.sport = tw->tw_num; 522 entry.dport = ntohs(tw->tw_dport); 523 entry.userlocks = 0; 524 525 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry)) 526 return 0; 527 } 528 529 return inet_twsk_diag_fill(tw, skb, r->idiag_ext, 530 NETLINK_CB(cb->skb).pid, 531 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 532 } 533 534 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk, 535 struct request_sock *req, u32 pid, u32 seq, 536 const struct nlmsghdr *unlh) 537 { 538 const struct inet_request_sock *ireq = inet_rsk(req); 539 struct inet_sock *inet = inet_sk(sk); 540 unsigned char *b = skb_tail_pointer(skb); 541 struct inet_diag_msg *r; 542 struct nlmsghdr *nlh; 543 long tmo; 544 545 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); 546 nlh->nlmsg_flags = NLM_F_MULTI; 547 r = NLMSG_DATA(nlh); 548 549 r->idiag_family = sk->sk_family; 550 r->idiag_state = TCP_SYN_RECV; 551 r->idiag_timer = 1; 552 r->idiag_retrans = req->retrans; 553 554 r->id.idiag_if = sk->sk_bound_dev_if; 555 r->id.idiag_cookie[0] = (u32)(unsigned long)req; 556 r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1); 557 558 tmo = req->expires - jiffies; 559 if (tmo < 0) 560 tmo = 0; 561 562 r->id.idiag_sport = inet->sport; 563 r->id.idiag_dport = ireq->rmt_port; 564 r->id.idiag_src[0] = ireq->loc_addr; 565 r->id.idiag_dst[0] = ireq->rmt_addr; 566 r->idiag_expires = jiffies_to_msecs(tmo); 567 r->idiag_rqueue = 0; 568 r->idiag_wqueue = 0; 569 r->idiag_uid = sock_i_uid(sk); 570 r->idiag_inode = 0; 571 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 572 if (r->idiag_family == AF_INET6) { 573 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, 574 &inet6_rsk(req)->loc_addr); 575 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, 576 &inet6_rsk(req)->rmt_addr); 577 } 578 #endif 579 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 580 581 return skb->len; 582 583 nlmsg_failure: 584 nlmsg_trim(skb, b); 585 return -1; 586 } 587 588 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk, 589 struct netlink_callback *cb) 590 { 591 struct inet_diag_entry entry; 592 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 593 struct inet_connection_sock *icsk = inet_csk(sk); 594 struct listen_sock *lopt; 595 struct rtattr *bc = NULL; 596 struct inet_sock *inet = inet_sk(sk); 597 int j, s_j; 598 int reqnum, s_reqnum; 599 int err = 0; 600 601 s_j = cb->args[3]; 602 s_reqnum = cb->args[4]; 603 604 if (s_j > 0) 605 s_j--; 606 607 entry.family = sk->sk_family; 608 609 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 610 611 lopt = icsk->icsk_accept_queue.listen_opt; 612 if (!lopt || !lopt->qlen) 613 goto out; 614 615 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { 616 bc = (struct rtattr *)(r + 1); 617 entry.sport = inet->num; 618 entry.userlocks = sk->sk_userlocks; 619 } 620 621 for (j = s_j; j < lopt->nr_table_entries; j++) { 622 struct request_sock *req, *head = lopt->syn_table[j]; 623 624 reqnum = 0; 625 for (req = head; req; reqnum++, req = req->dl_next) { 626 struct inet_request_sock *ireq = inet_rsk(req); 627 628 if (reqnum < s_reqnum) 629 continue; 630 if (r->id.idiag_dport != ireq->rmt_port && 631 r->id.idiag_dport) 632 continue; 633 634 if (bc) { 635 entry.saddr = 636 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 637 (entry.family == AF_INET6) ? 638 inet6_rsk(req)->loc_addr.s6_addr32 : 639 #endif 640 &ireq->loc_addr; 641 entry.daddr = 642 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 643 (entry.family == AF_INET6) ? 644 inet6_rsk(req)->rmt_addr.s6_addr32 : 645 #endif 646 &ireq->rmt_addr; 647 entry.dport = ntohs(ireq->rmt_port); 648 649 if (!inet_diag_bc_run(RTA_DATA(bc), 650 RTA_PAYLOAD(bc), &entry)) 651 continue; 652 } 653 654 err = inet_diag_fill_req(skb, sk, req, 655 NETLINK_CB(cb->skb).pid, 656 cb->nlh->nlmsg_seq, cb->nlh); 657 if (err < 0) { 658 cb->args[3] = j + 1; 659 cb->args[4] = reqnum; 660 goto out; 661 } 662 } 663 664 s_reqnum = 0; 665 } 666 667 out: 668 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 669 670 return err; 671 } 672 673 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) 674 { 675 int i, num; 676 int s_i, s_num; 677 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 678 const struct inet_diag_handler *handler; 679 struct inet_hashinfo *hashinfo; 680 681 handler = inet_diag_table[cb->nlh->nlmsg_type]; 682 BUG_ON(handler == NULL); 683 hashinfo = handler->idiag_hashinfo; 684 685 s_i = cb->args[1]; 686 s_num = num = cb->args[2]; 687 688 if (cb->args[0] == 0) { 689 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV))) 690 goto skip_listen_ht; 691 692 inet_listen_lock(hashinfo); 693 for (i = s_i; i < INET_LHTABLE_SIZE; i++) { 694 struct sock *sk; 695 struct hlist_node *node; 696 697 num = 0; 698 sk_for_each(sk, node, &hashinfo->listening_hash[i]) { 699 struct inet_sock *inet = inet_sk(sk); 700 701 if (num < s_num) { 702 num++; 703 continue; 704 } 705 706 if (r->id.idiag_sport != inet->sport && 707 r->id.idiag_sport) 708 goto next_listen; 709 710 if (!(r->idiag_states & TCPF_LISTEN) || 711 r->id.idiag_dport || 712 cb->args[3] > 0) 713 goto syn_recv; 714 715 if (inet_csk_diag_dump(sk, skb, cb) < 0) { 716 inet_listen_unlock(hashinfo); 717 goto done; 718 } 719 720 syn_recv: 721 if (!(r->idiag_states & TCPF_SYN_RECV)) 722 goto next_listen; 723 724 if (inet_diag_dump_reqs(skb, sk, cb) < 0) { 725 inet_listen_unlock(hashinfo); 726 goto done; 727 } 728 729 next_listen: 730 cb->args[3] = 0; 731 cb->args[4] = 0; 732 ++num; 733 } 734 735 s_num = 0; 736 cb->args[3] = 0; 737 cb->args[4] = 0; 738 } 739 inet_listen_unlock(hashinfo); 740 skip_listen_ht: 741 cb->args[0] = 1; 742 s_i = num = s_num = 0; 743 } 744 745 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV))) 746 return skb->len; 747 748 for (i = s_i; i < hashinfo->ehash_size; i++) { 749 struct inet_ehash_bucket *head = &hashinfo->ehash[i]; 750 struct sock *sk; 751 struct hlist_node *node; 752 753 if (i > s_i) 754 s_num = 0; 755 756 read_lock_bh(&head->lock); 757 num = 0; 758 sk_for_each(sk, node, &head->chain) { 759 struct inet_sock *inet = inet_sk(sk); 760 761 if (num < s_num) 762 goto next_normal; 763 if (!(r->idiag_states & (1 << sk->sk_state))) 764 goto next_normal; 765 if (r->id.idiag_sport != inet->sport && 766 r->id.idiag_sport) 767 goto next_normal; 768 if (r->id.idiag_dport != inet->dport && 769 r->id.idiag_dport) 770 goto next_normal; 771 if (inet_csk_diag_dump(sk, skb, cb) < 0) { 772 read_unlock_bh(&head->lock); 773 goto done; 774 } 775 next_normal: 776 ++num; 777 } 778 779 if (r->idiag_states & TCPF_TIME_WAIT) { 780 struct inet_timewait_sock *tw; 781 782 inet_twsk_for_each(tw, node, 783 &head->twchain) { 784 785 if (num < s_num) 786 goto next_dying; 787 if (r->id.idiag_sport != tw->tw_sport && 788 r->id.idiag_sport) 789 goto next_dying; 790 if (r->id.idiag_dport != tw->tw_dport && 791 r->id.idiag_dport) 792 goto next_dying; 793 if (inet_twsk_diag_dump(tw, skb, cb) < 0) { 794 read_unlock_bh(&head->lock); 795 goto done; 796 } 797 next_dying: 798 ++num; 799 } 800 } 801 read_unlock_bh(&head->lock); 802 } 803 804 done: 805 cb->args[1] = i; 806 cb->args[2] = num; 807 return skb->len; 808 } 809 810 static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 811 { 812 int hdrlen = sizeof(struct inet_diag_req); 813 814 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX || 815 nlmsg_len(nlh) < hdrlen) 816 return -EINVAL; 817 818 if (inet_diag_table[nlh->nlmsg_type] == NULL) 819 return -ENOENT; 820 821 if (nlh->nlmsg_flags & NLM_F_DUMP) { 822 if (nlmsg_attrlen(nlh, hdrlen)) { 823 struct nlattr *attr; 824 825 attr = nlmsg_find_attr(nlh, hdrlen, 826 INET_DIAG_REQ_BYTECODE); 827 if (attr == NULL || 828 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 829 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 830 return -EINVAL; 831 } 832 833 return netlink_dump_start(idiagnl, skb, nlh, 834 inet_diag_dump, NULL); 835 } 836 837 return inet_diag_get_exact(skb, nlh); 838 } 839 840 static DEFINE_MUTEX(inet_diag_mutex); 841 842 static void inet_diag_rcv(struct sk_buff *skb) 843 { 844 mutex_lock(&inet_diag_mutex); 845 netlink_rcv_skb(skb, &inet_diag_rcv_msg); 846 mutex_unlock(&inet_diag_mutex); 847 } 848 849 static DEFINE_SPINLOCK(inet_diag_register_lock); 850 851 int inet_diag_register(const struct inet_diag_handler *h) 852 { 853 const __u16 type = h->idiag_type; 854 int err = -EINVAL; 855 856 if (type >= INET_DIAG_GETSOCK_MAX) 857 goto out; 858 859 spin_lock(&inet_diag_register_lock); 860 err = -EEXIST; 861 if (inet_diag_table[type] == NULL) { 862 inet_diag_table[type] = h; 863 err = 0; 864 } 865 spin_unlock(&inet_diag_register_lock); 866 out: 867 return err; 868 } 869 EXPORT_SYMBOL_GPL(inet_diag_register); 870 871 void inet_diag_unregister(const struct inet_diag_handler *h) 872 { 873 const __u16 type = h->idiag_type; 874 875 if (type >= INET_DIAG_GETSOCK_MAX) 876 return; 877 878 spin_lock(&inet_diag_register_lock); 879 inet_diag_table[type] = NULL; 880 spin_unlock(&inet_diag_register_lock); 881 882 synchronize_rcu(); 883 } 884 EXPORT_SYMBOL_GPL(inet_diag_unregister); 885 886 static int __init inet_diag_init(void) 887 { 888 const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX * 889 sizeof(struct inet_diag_handler *)); 890 int err = -ENOMEM; 891 892 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL); 893 if (!inet_diag_table) 894 goto out; 895 896 idiagnl = netlink_kernel_create(&init_net, NETLINK_INET_DIAG, 0, 897 inet_diag_rcv, NULL, THIS_MODULE); 898 if (idiagnl == NULL) 899 goto out_free_table; 900 err = 0; 901 out: 902 return err; 903 out_free_table: 904 kfree(inet_diag_table); 905 goto out; 906 } 907 908 static void __exit inet_diag_exit(void) 909 { 910 sock_release(idiagnl->sk_socket); 911 kfree(inet_diag_table); 912 } 913 914 module_init(inet_diag_init); 915 module_exit(inet_diag_exit); 916 MODULE_LICENSE("GPL"); 917