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/module.h> 15 #include <linux/types.h> 16 #include <linux/fcntl.h> 17 #include <linux/random.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 37 static const struct inet_diag_handler **inet_diag_table; 38 39 struct inet_diag_entry { 40 __be32 *saddr; 41 __be32 *daddr; 42 u16 sport; 43 u16 dport; 44 u16 family; 45 u16 userlocks; 46 }; 47 48 static struct sock *idiagnl; 49 50 #define INET_DIAG_PUT(skb, attrtype, attrlen) \ 51 RTA_DATA(__RTA_PUT(skb, attrtype, attrlen)) 52 53 static int inet_csk_diag_fill(struct sock *sk, 54 struct sk_buff *skb, 55 int ext, u32 pid, u32 seq, u16 nlmsg_flags, 56 const struct nlmsghdr *unlh) 57 { 58 const struct inet_sock *inet = inet_sk(sk); 59 const struct inet_connection_sock *icsk = inet_csk(sk); 60 struct inet_diag_msg *r; 61 struct nlmsghdr *nlh; 62 void *info = NULL; 63 struct inet_diag_meminfo *minfo = NULL; 64 unsigned char *b = skb_tail_pointer(skb); 65 const struct inet_diag_handler *handler; 66 67 handler = inet_diag_table[unlh->nlmsg_type]; 68 BUG_ON(handler == NULL); 69 70 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); 71 nlh->nlmsg_flags = nlmsg_flags; 72 73 r = NLMSG_DATA(nlh); 74 BUG_ON(sk->sk_state == TCP_TIME_WAIT); 75 76 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) 77 minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo)); 78 79 if (ext & (1 << (INET_DIAG_INFO - 1))) 80 info = INET_DIAG_PUT(skb, INET_DIAG_INFO, 81 handler->idiag_info_size); 82 83 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) { 84 const size_t len = strlen(icsk->icsk_ca_ops->name); 85 86 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1), 87 icsk->icsk_ca_ops->name); 88 } 89 90 r->idiag_family = sk->sk_family; 91 r->idiag_state = sk->sk_state; 92 r->idiag_timer = 0; 93 r->idiag_retrans = 0; 94 95 r->id.idiag_if = sk->sk_bound_dev_if; 96 r->id.idiag_cookie[0] = (u32)(unsigned long)sk; 97 r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1); 98 99 r->id.idiag_sport = inet->sport; 100 r->id.idiag_dport = inet->dport; 101 r->id.idiag_src[0] = inet->rcv_saddr; 102 r->id.idiag_dst[0] = inet->daddr; 103 104 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 105 if (r->idiag_family == AF_INET6) { 106 struct ipv6_pinfo *np = inet6_sk(sk); 107 108 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, 109 &np->rcv_saddr); 110 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, 111 &np->daddr); 112 } 113 #endif 114 115 #define EXPIRES_IN_MS(tmo) ((tmo - jiffies) * 1000 + HZ - 1) / HZ 116 117 if (icsk->icsk_pending == ICSK_TIME_RETRANS) { 118 r->idiag_timer = 1; 119 r->idiag_retrans = icsk->icsk_retransmits; 120 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 121 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { 122 r->idiag_timer = 4; 123 r->idiag_retrans = icsk->icsk_probes_out; 124 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 125 } else if (timer_pending(&sk->sk_timer)) { 126 r->idiag_timer = 2; 127 r->idiag_retrans = icsk->icsk_probes_out; 128 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires); 129 } else { 130 r->idiag_timer = 0; 131 r->idiag_expires = 0; 132 } 133 #undef EXPIRES_IN_MS 134 135 r->idiag_uid = sock_i_uid(sk); 136 r->idiag_inode = sock_i_ino(sk); 137 138 if (minfo) { 139 minfo->idiag_rmem = atomic_read(&sk->sk_rmem_alloc); 140 minfo->idiag_wmem = sk->sk_wmem_queued; 141 minfo->idiag_fmem = sk->sk_forward_alloc; 142 minfo->idiag_tmem = atomic_read(&sk->sk_wmem_alloc); 143 } 144 145 handler->idiag_get_info(sk, r, info); 146 147 if (sk->sk_state < TCP_TIME_WAIT && 148 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info) 149 icsk->icsk_ca_ops->get_info(sk, ext, skb); 150 151 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 152 return skb->len; 153 154 rtattr_failure: 155 nlmsg_failure: 156 nlmsg_trim(skb, b); 157 return -EMSGSIZE; 158 } 159 160 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw, 161 struct sk_buff *skb, int ext, u32 pid, 162 u32 seq, u16 nlmsg_flags, 163 const struct nlmsghdr *unlh) 164 { 165 long tmo; 166 struct inet_diag_msg *r; 167 const unsigned char *previous_tail = skb_tail_pointer(skb); 168 struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq, 169 unlh->nlmsg_type, sizeof(*r)); 170 171 r = NLMSG_DATA(nlh); 172 BUG_ON(tw->tw_state != TCP_TIME_WAIT); 173 174 nlh->nlmsg_flags = nlmsg_flags; 175 176 tmo = tw->tw_ttd - jiffies; 177 if (tmo < 0) 178 tmo = 0; 179 180 r->idiag_family = tw->tw_family; 181 r->idiag_state = tw->tw_state; 182 r->idiag_timer = 0; 183 r->idiag_retrans = 0; 184 r->id.idiag_if = tw->tw_bound_dev_if; 185 r->id.idiag_cookie[0] = (u32)(unsigned long)tw; 186 r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1); 187 r->id.idiag_sport = tw->tw_sport; 188 r->id.idiag_dport = tw->tw_dport; 189 r->id.idiag_src[0] = tw->tw_rcv_saddr; 190 r->id.idiag_dst[0] = tw->tw_daddr; 191 r->idiag_state = tw->tw_substate; 192 r->idiag_timer = 3; 193 r->idiag_expires = (tmo * 1000 + HZ - 1) / HZ; 194 r->idiag_rqueue = 0; 195 r->idiag_wqueue = 0; 196 r->idiag_uid = 0; 197 r->idiag_inode = 0; 198 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 199 if (tw->tw_family == AF_INET6) { 200 const struct inet6_timewait_sock *tw6 = 201 inet6_twsk((struct sock *)tw); 202 203 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, 204 &tw6->tw_v6_rcv_saddr); 205 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, 206 &tw6->tw_v6_daddr); 207 } 208 #endif 209 nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail; 210 return skb->len; 211 nlmsg_failure: 212 nlmsg_trim(skb, previous_tail); 213 return -EMSGSIZE; 214 } 215 216 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, 217 int ext, u32 pid, u32 seq, u16 nlmsg_flags, 218 const struct nlmsghdr *unlh) 219 { 220 if (sk->sk_state == TCP_TIME_WAIT) 221 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk, 222 skb, ext, pid, seq, nlmsg_flags, 223 unlh); 224 return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh); 225 } 226 227 static int inet_diag_get_exact(struct sk_buff *in_skb, 228 const struct nlmsghdr *nlh) 229 { 230 int err; 231 struct sock *sk; 232 struct inet_diag_req *req = NLMSG_DATA(nlh); 233 struct sk_buff *rep; 234 struct inet_hashinfo *hashinfo; 235 const struct inet_diag_handler *handler; 236 237 handler = inet_diag_table[nlh->nlmsg_type]; 238 BUG_ON(handler == NULL); 239 hashinfo = handler->idiag_hashinfo; 240 241 if (req->idiag_family == AF_INET) { 242 sk = inet_lookup(hashinfo, req->id.idiag_dst[0], 243 req->id.idiag_dport, req->id.idiag_src[0], 244 req->id.idiag_sport, req->id.idiag_if); 245 } 246 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 247 else if (req->idiag_family == AF_INET6) { 248 sk = inet6_lookup(hashinfo, 249 (struct in6_addr *)req->id.idiag_dst, 250 req->id.idiag_dport, 251 (struct in6_addr *)req->id.idiag_src, 252 req->id.idiag_sport, 253 req->id.idiag_if); 254 } 255 #endif 256 else { 257 return -EINVAL; 258 } 259 260 if (sk == NULL) 261 return -ENOENT; 262 263 err = -ESTALE; 264 if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE || 265 req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) && 266 ((u32)(unsigned long)sk != req->id.idiag_cookie[0] || 267 (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1])) 268 goto out; 269 270 err = -ENOMEM; 271 rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) + 272 sizeof(struct inet_diag_meminfo) + 273 handler->idiag_info_size + 64)), 274 GFP_KERNEL); 275 if (!rep) 276 goto out; 277 278 err = sk_diag_fill(sk, rep, req->idiag_ext, 279 NETLINK_CB(in_skb).pid, 280 nlh->nlmsg_seq, 0, nlh); 281 if (err < 0) { 282 WARN_ON(err == -EMSGSIZE); 283 kfree_skb(rep); 284 goto out; 285 } 286 err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid, 287 MSG_DONTWAIT); 288 if (err > 0) 289 err = 0; 290 291 out: 292 if (sk) { 293 if (sk->sk_state == TCP_TIME_WAIT) 294 inet_twsk_put((struct inet_timewait_sock *)sk); 295 else 296 sock_put(sk); 297 } 298 return err; 299 } 300 301 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits) 302 { 303 int words = bits >> 5; 304 305 bits &= 0x1f; 306 307 if (words) { 308 if (memcmp(a1, a2, words << 2)) 309 return 0; 310 } 311 if (bits) { 312 __be32 w1, w2; 313 __be32 mask; 314 315 w1 = a1[words]; 316 w2 = a2[words]; 317 318 mask = htonl((0xffffffff) << (32 - bits)); 319 320 if ((w1 ^ w2) & mask) 321 return 0; 322 } 323 324 return 1; 325 } 326 327 328 static int inet_diag_bc_run(const void *bc, int len, 329 const struct inet_diag_entry *entry) 330 { 331 while (len > 0) { 332 int yes = 1; 333 const struct inet_diag_bc_op *op = bc; 334 335 switch (op->code) { 336 case INET_DIAG_BC_NOP: 337 break; 338 case INET_DIAG_BC_JMP: 339 yes = 0; 340 break; 341 case INET_DIAG_BC_S_GE: 342 yes = entry->sport >= op[1].no; 343 break; 344 case INET_DIAG_BC_S_LE: 345 yes = entry->dport <= op[1].no; 346 break; 347 case INET_DIAG_BC_D_GE: 348 yes = entry->dport >= op[1].no; 349 break; 350 case INET_DIAG_BC_D_LE: 351 yes = entry->dport <= op[1].no; 352 break; 353 case INET_DIAG_BC_AUTO: 354 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); 355 break; 356 case INET_DIAG_BC_S_COND: 357 case INET_DIAG_BC_D_COND: { 358 struct inet_diag_hostcond *cond; 359 __be32 *addr; 360 361 cond = (struct inet_diag_hostcond *)(op + 1); 362 if (cond->port != -1 && 363 cond->port != (op->code == INET_DIAG_BC_S_COND ? 364 entry->sport : entry->dport)) { 365 yes = 0; 366 break; 367 } 368 369 if (cond->prefix_len == 0) 370 break; 371 372 if (op->code == INET_DIAG_BC_S_COND) 373 addr = entry->saddr; 374 else 375 addr = entry->daddr; 376 377 if (bitstring_match(addr, cond->addr, 378 cond->prefix_len)) 379 break; 380 if (entry->family == AF_INET6 && 381 cond->family == AF_INET) { 382 if (addr[0] == 0 && addr[1] == 0 && 383 addr[2] == htonl(0xffff) && 384 bitstring_match(addr + 3, cond->addr, 385 cond->prefix_len)) 386 break; 387 } 388 yes = 0; 389 break; 390 } 391 } 392 393 if (yes) { 394 len -= op->yes; 395 bc += op->yes; 396 } else { 397 len -= op->no; 398 bc += op->no; 399 } 400 } 401 return (len == 0); 402 } 403 404 static int valid_cc(const void *bc, int len, int cc) 405 { 406 while (len >= 0) { 407 const struct inet_diag_bc_op *op = bc; 408 409 if (cc > len) 410 return 0; 411 if (cc == len) 412 return 1; 413 if (op->yes < 4) 414 return 0; 415 len -= op->yes; 416 bc += op->yes; 417 } 418 return 0; 419 } 420 421 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len) 422 { 423 const unsigned char *bc = bytecode; 424 int len = bytecode_len; 425 426 while (len > 0) { 427 struct inet_diag_bc_op *op = (struct inet_diag_bc_op *)bc; 428 429 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len); 430 switch (op->code) { 431 case INET_DIAG_BC_AUTO: 432 case INET_DIAG_BC_S_COND: 433 case INET_DIAG_BC_D_COND: 434 case INET_DIAG_BC_S_GE: 435 case INET_DIAG_BC_S_LE: 436 case INET_DIAG_BC_D_GE: 437 case INET_DIAG_BC_D_LE: 438 if (op->yes < 4 || op->yes > len + 4) 439 return -EINVAL; 440 case INET_DIAG_BC_JMP: 441 if (op->no < 4 || op->no > len + 4) 442 return -EINVAL; 443 if (op->no < len && 444 !valid_cc(bytecode, bytecode_len, len - op->no)) 445 return -EINVAL; 446 break; 447 case INET_DIAG_BC_NOP: 448 if (op->yes < 4 || op->yes > len + 4) 449 return -EINVAL; 450 break; 451 default: 452 return -EINVAL; 453 } 454 bc += op->yes; 455 len -= op->yes; 456 } 457 return len == 0 ? 0 : -EINVAL; 458 } 459 460 static int inet_csk_diag_dump(struct sock *sk, 461 struct sk_buff *skb, 462 struct netlink_callback *cb) 463 { 464 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 465 466 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { 467 struct inet_diag_entry entry; 468 struct rtattr *bc = (struct rtattr *)(r + 1); 469 struct inet_sock *inet = inet_sk(sk); 470 471 entry.family = sk->sk_family; 472 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 473 if (entry.family == AF_INET6) { 474 struct ipv6_pinfo *np = inet6_sk(sk); 475 476 entry.saddr = np->rcv_saddr.s6_addr32; 477 entry.daddr = np->daddr.s6_addr32; 478 } else 479 #endif 480 { 481 entry.saddr = &inet->rcv_saddr; 482 entry.daddr = &inet->daddr; 483 } 484 entry.sport = inet->num; 485 entry.dport = ntohs(inet->dport); 486 entry.userlocks = sk->sk_userlocks; 487 488 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry)) 489 return 0; 490 } 491 492 return inet_csk_diag_fill(sk, skb, r->idiag_ext, 493 NETLINK_CB(cb->skb).pid, 494 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 495 } 496 497 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw, 498 struct sk_buff *skb, 499 struct netlink_callback *cb) 500 { 501 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 502 503 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { 504 struct inet_diag_entry entry; 505 struct rtattr *bc = (struct rtattr *)(r + 1); 506 507 entry.family = tw->tw_family; 508 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 509 if (tw->tw_family == AF_INET6) { 510 struct inet6_timewait_sock *tw6 = 511 inet6_twsk((struct sock *)tw); 512 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32; 513 entry.daddr = tw6->tw_v6_daddr.s6_addr32; 514 } else 515 #endif 516 { 517 entry.saddr = &tw->tw_rcv_saddr; 518 entry.daddr = &tw->tw_daddr; 519 } 520 entry.sport = tw->tw_num; 521 entry.dport = ntohs(tw->tw_dport); 522 entry.userlocks = 0; 523 524 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry)) 525 return 0; 526 } 527 528 return inet_twsk_diag_fill(tw, skb, r->idiag_ext, 529 NETLINK_CB(cb->skb).pid, 530 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 531 } 532 533 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk, 534 struct request_sock *req, u32 pid, u32 seq, 535 const struct nlmsghdr *unlh) 536 { 537 const struct inet_request_sock *ireq = inet_rsk(req); 538 struct inet_sock *inet = inet_sk(sk); 539 unsigned char *b = skb_tail_pointer(skb); 540 struct inet_diag_msg *r; 541 struct nlmsghdr *nlh; 542 long tmo; 543 544 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); 545 nlh->nlmsg_flags = NLM_F_MULTI; 546 r = NLMSG_DATA(nlh); 547 548 r->idiag_family = sk->sk_family; 549 r->idiag_state = TCP_SYN_RECV; 550 r->idiag_timer = 1; 551 r->idiag_retrans = req->retrans; 552 553 r->id.idiag_if = sk->sk_bound_dev_if; 554 r->id.idiag_cookie[0] = (u32)(unsigned long)req; 555 r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1); 556 557 tmo = req->expires - jiffies; 558 if (tmo < 0) 559 tmo = 0; 560 561 r->id.idiag_sport = inet->sport; 562 r->id.idiag_dport = ireq->rmt_port; 563 r->id.idiag_src[0] = ireq->loc_addr; 564 r->id.idiag_dst[0] = ireq->rmt_addr; 565 r->idiag_expires = jiffies_to_msecs(tmo); 566 r->idiag_rqueue = 0; 567 r->idiag_wqueue = 0; 568 r->idiag_uid = sock_i_uid(sk); 569 r->idiag_inode = 0; 570 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 571 if (r->idiag_family == AF_INET6) { 572 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, 573 &inet6_rsk(req)->loc_addr); 574 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, 575 &inet6_rsk(req)->rmt_addr); 576 } 577 #endif 578 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 579 580 return skb->len; 581 582 nlmsg_failure: 583 nlmsg_trim(skb, b); 584 return -1; 585 } 586 587 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk, 588 struct netlink_callback *cb) 589 { 590 struct inet_diag_entry entry; 591 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 592 struct inet_connection_sock *icsk = inet_csk(sk); 593 struct listen_sock *lopt; 594 struct rtattr *bc = NULL; 595 struct inet_sock *inet = inet_sk(sk); 596 int j, s_j; 597 int reqnum, s_reqnum; 598 int err = 0; 599 600 s_j = cb->args[3]; 601 s_reqnum = cb->args[4]; 602 603 if (s_j > 0) 604 s_j--; 605 606 entry.family = sk->sk_family; 607 608 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 609 610 lopt = icsk->icsk_accept_queue.listen_opt; 611 if (!lopt || !lopt->qlen) 612 goto out; 613 614 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { 615 bc = (struct rtattr *)(r + 1); 616 entry.sport = inet->num; 617 entry.userlocks = sk->sk_userlocks; 618 } 619 620 for (j = s_j; j < lopt->nr_table_entries; j++) { 621 struct request_sock *req, *head = lopt->syn_table[j]; 622 623 reqnum = 0; 624 for (req = head; req; reqnum++, req = req->dl_next) { 625 struct inet_request_sock *ireq = inet_rsk(req); 626 627 if (reqnum < s_reqnum) 628 continue; 629 if (r->id.idiag_dport != ireq->rmt_port && 630 r->id.idiag_dport) 631 continue; 632 633 if (bc) { 634 entry.saddr = 635 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 636 (entry.family == AF_INET6) ? 637 inet6_rsk(req)->loc_addr.s6_addr32 : 638 #endif 639 &ireq->loc_addr; 640 entry.daddr = 641 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 642 (entry.family == AF_INET6) ? 643 inet6_rsk(req)->rmt_addr.s6_addr32 : 644 #endif 645 &ireq->rmt_addr; 646 entry.dport = ntohs(ireq->rmt_port); 647 648 if (!inet_diag_bc_run(RTA_DATA(bc), 649 RTA_PAYLOAD(bc), &entry)) 650 continue; 651 } 652 653 err = inet_diag_fill_req(skb, sk, req, 654 NETLINK_CB(cb->skb).pid, 655 cb->nlh->nlmsg_seq, cb->nlh); 656 if (err < 0) { 657 cb->args[3] = j + 1; 658 cb->args[4] = reqnum; 659 goto out; 660 } 661 } 662 663 s_reqnum = 0; 664 } 665 666 out: 667 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 668 669 return err; 670 } 671 672 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) 673 { 674 int i, num; 675 int s_i, s_num; 676 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 677 const struct inet_diag_handler *handler; 678 struct inet_hashinfo *hashinfo; 679 680 handler = inet_diag_table[cb->nlh->nlmsg_type]; 681 BUG_ON(handler == NULL); 682 hashinfo = handler->idiag_hashinfo; 683 684 s_i = cb->args[1]; 685 s_num = num = cb->args[2]; 686 687 if (cb->args[0] == 0) { 688 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV))) 689 goto skip_listen_ht; 690 691 inet_listen_lock(hashinfo); 692 for (i = s_i; i < INET_LHTABLE_SIZE; i++) { 693 struct sock *sk; 694 struct hlist_node *node; 695 696 num = 0; 697 sk_for_each(sk, node, &hashinfo->listening_hash[i]) { 698 struct inet_sock *inet = inet_sk(sk); 699 700 if (num < s_num) { 701 num++; 702 continue; 703 } 704 705 if (r->id.idiag_sport != inet->sport && 706 r->id.idiag_sport) 707 goto next_listen; 708 709 if (!(r->idiag_states & TCPF_LISTEN) || 710 r->id.idiag_dport || 711 cb->args[3] > 0) 712 goto syn_recv; 713 714 if (inet_csk_diag_dump(sk, skb, cb) < 0) { 715 inet_listen_unlock(hashinfo); 716 goto done; 717 } 718 719 syn_recv: 720 if (!(r->idiag_states & TCPF_SYN_RECV)) 721 goto next_listen; 722 723 if (inet_diag_dump_reqs(skb, sk, cb) < 0) { 724 inet_listen_unlock(hashinfo); 725 goto done; 726 } 727 728 next_listen: 729 cb->args[3] = 0; 730 cb->args[4] = 0; 731 ++num; 732 } 733 734 s_num = 0; 735 cb->args[3] = 0; 736 cb->args[4] = 0; 737 } 738 inet_listen_unlock(hashinfo); 739 skip_listen_ht: 740 cb->args[0] = 1; 741 s_i = num = s_num = 0; 742 } 743 744 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV))) 745 return skb->len; 746 747 for (i = s_i; i < hashinfo->ehash_size; i++) { 748 struct inet_ehash_bucket *head = &hashinfo->ehash[i]; 749 struct sock *sk; 750 struct hlist_node *node; 751 752 if (i > s_i) 753 s_num = 0; 754 755 read_lock_bh(&head->lock); 756 num = 0; 757 sk_for_each(sk, node, &head->chain) { 758 struct inet_sock *inet = inet_sk(sk); 759 760 if (num < s_num) 761 goto next_normal; 762 if (!(r->idiag_states & (1 << sk->sk_state))) 763 goto next_normal; 764 if (r->id.idiag_sport != inet->sport && 765 r->id.idiag_sport) 766 goto next_normal; 767 if (r->id.idiag_dport != inet->dport && 768 r->id.idiag_dport) 769 goto next_normal; 770 if (inet_csk_diag_dump(sk, skb, cb) < 0) { 771 read_unlock_bh(&head->lock); 772 goto done; 773 } 774 next_normal: 775 ++num; 776 } 777 778 if (r->idiag_states & TCPF_TIME_WAIT) { 779 struct inet_timewait_sock *tw; 780 781 inet_twsk_for_each(tw, node, 782 &head->twchain) { 783 784 if (num < s_num) 785 goto next_dying; 786 if (r->id.idiag_sport != tw->tw_sport && 787 r->id.idiag_sport) 788 goto next_dying; 789 if (r->id.idiag_dport != tw->tw_dport && 790 r->id.idiag_dport) 791 goto next_dying; 792 if (inet_twsk_diag_dump(tw, skb, cb) < 0) { 793 read_unlock_bh(&head->lock); 794 goto done; 795 } 796 next_dying: 797 ++num; 798 } 799 } 800 read_unlock_bh(&head->lock); 801 } 802 803 done: 804 cb->args[1] = i; 805 cb->args[2] = num; 806 return skb->len; 807 } 808 809 static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 810 { 811 int hdrlen = sizeof(struct inet_diag_req); 812 813 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX || 814 nlmsg_len(nlh) < hdrlen) 815 return -EINVAL; 816 817 if (inet_diag_table[nlh->nlmsg_type] == NULL) 818 return -ENOENT; 819 820 if (nlh->nlmsg_flags & NLM_F_DUMP) { 821 if (nlmsg_attrlen(nlh, hdrlen)) { 822 struct nlattr *attr; 823 824 attr = nlmsg_find_attr(nlh, hdrlen, 825 INET_DIAG_REQ_BYTECODE); 826 if (attr == NULL || 827 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 828 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 829 return -EINVAL; 830 } 831 832 return netlink_dump_start(idiagnl, skb, nlh, 833 inet_diag_dump, NULL); 834 } 835 836 return inet_diag_get_exact(skb, nlh); 837 } 838 839 static void inet_diag_rcv(struct sock *sk, int len) 840 { 841 unsigned int qlen = 0; 842 843 do { 844 netlink_run_queue(sk, &qlen, &inet_diag_rcv_msg); 845 } while (qlen); 846 } 847 848 static DEFINE_SPINLOCK(inet_diag_register_lock); 849 850 int inet_diag_register(const struct inet_diag_handler *h) 851 { 852 const __u16 type = h->idiag_type; 853 int err = -EINVAL; 854 855 if (type >= INET_DIAG_GETSOCK_MAX) 856 goto out; 857 858 spin_lock(&inet_diag_register_lock); 859 err = -EEXIST; 860 if (inet_diag_table[type] == NULL) { 861 inet_diag_table[type] = h; 862 err = 0; 863 } 864 spin_unlock(&inet_diag_register_lock); 865 out: 866 return err; 867 } 868 EXPORT_SYMBOL_GPL(inet_diag_register); 869 870 void inet_diag_unregister(const struct inet_diag_handler *h) 871 { 872 const __u16 type = h->idiag_type; 873 874 if (type >= INET_DIAG_GETSOCK_MAX) 875 return; 876 877 spin_lock(&inet_diag_register_lock); 878 inet_diag_table[type] = NULL; 879 spin_unlock(&inet_diag_register_lock); 880 881 synchronize_rcu(); 882 } 883 EXPORT_SYMBOL_GPL(inet_diag_unregister); 884 885 static int __init inet_diag_init(void) 886 { 887 const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX * 888 sizeof(struct inet_diag_handler *)); 889 int err = -ENOMEM; 890 891 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL); 892 if (!inet_diag_table) 893 goto out; 894 895 idiagnl = netlink_kernel_create(NETLINK_INET_DIAG, 0, inet_diag_rcv, 896 NULL, THIS_MODULE); 897 if (idiagnl == NULL) 898 goto out_free_table; 899 err = 0; 900 out: 901 return err; 902 out_free_table: 903 kfree(inet_diag_table); 904 goto out; 905 } 906 907 static void __exit inet_diag_exit(void) 908 { 909 sock_release(idiagnl->sk_socket); 910 kfree(inet_diag_table); 911 } 912 913 module_init(inet_diag_init); 914 module_exit(inet_diag_exit); 915 MODULE_LICENSE("GPL"); 916