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/config.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 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 u32 *saddr; 41 u32 *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; 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 - b; 152 return skb->len; 153 154 rtattr_failure: 155 nlmsg_failure: 156 skb_trim(skb, b - skb->data); 157 return -1; 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; 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 - previous_tail; 210 return skb->len; 211 nlmsg_failure: 212 skb_trim(skb, previous_tail - skb->data); 213 return -1; 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 if (sk_diag_fill(sk, rep, req->idiag_ext, 279 NETLINK_CB(in_skb).pid, 280 nlh->nlmsg_seq, 0, nlh) <= 0) 281 BUG(); 282 283 err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid, 284 MSG_DONTWAIT); 285 if (err > 0) 286 err = 0; 287 288 out: 289 if (sk) { 290 if (sk->sk_state == TCP_TIME_WAIT) 291 inet_twsk_put((struct inet_timewait_sock *)sk); 292 else 293 sock_put(sk); 294 } 295 return err; 296 } 297 298 static int bitstring_match(const u32 *a1, const u32 *a2, int bits) 299 { 300 int words = bits >> 5; 301 302 bits &= 0x1f; 303 304 if (words) { 305 if (memcmp(a1, a2, words << 2)) 306 return 0; 307 } 308 if (bits) { 309 __u32 w1, w2; 310 __u32 mask; 311 312 w1 = a1[words]; 313 w2 = a2[words]; 314 315 mask = htonl((0xffffffff) << (32 - bits)); 316 317 if ((w1 ^ w2) & mask) 318 return 0; 319 } 320 321 return 1; 322 } 323 324 325 static int inet_diag_bc_run(const void *bc, int len, 326 const struct inet_diag_entry *entry) 327 { 328 while (len > 0) { 329 int yes = 1; 330 const struct inet_diag_bc_op *op = bc; 331 332 switch (op->code) { 333 case INET_DIAG_BC_NOP: 334 break; 335 case INET_DIAG_BC_JMP: 336 yes = 0; 337 break; 338 case INET_DIAG_BC_S_GE: 339 yes = entry->sport >= op[1].no; 340 break; 341 case INET_DIAG_BC_S_LE: 342 yes = entry->dport <= op[1].no; 343 break; 344 case INET_DIAG_BC_D_GE: 345 yes = entry->dport >= op[1].no; 346 break; 347 case INET_DIAG_BC_D_LE: 348 yes = entry->dport <= op[1].no; 349 break; 350 case INET_DIAG_BC_AUTO: 351 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); 352 break; 353 case INET_DIAG_BC_S_COND: 354 case INET_DIAG_BC_D_COND: { 355 struct inet_diag_hostcond *cond; 356 u32 *addr; 357 358 cond = (struct inet_diag_hostcond *)(op + 1); 359 if (cond->port != -1 && 360 cond->port != (op->code == INET_DIAG_BC_S_COND ? 361 entry->sport : entry->dport)) { 362 yes = 0; 363 break; 364 } 365 366 if (cond->prefix_len == 0) 367 break; 368 369 if (op->code == INET_DIAG_BC_S_COND) 370 addr = entry->saddr; 371 else 372 addr = entry->daddr; 373 374 if (bitstring_match(addr, cond->addr, 375 cond->prefix_len)) 376 break; 377 if (entry->family == AF_INET6 && 378 cond->family == AF_INET) { 379 if (addr[0] == 0 && addr[1] == 0 && 380 addr[2] == htonl(0xffff) && 381 bitstring_match(addr + 3, cond->addr, 382 cond->prefix_len)) 383 break; 384 } 385 yes = 0; 386 break; 387 } 388 } 389 390 if (yes) { 391 len -= op->yes; 392 bc += op->yes; 393 } else { 394 len -= op->no; 395 bc += op->no; 396 } 397 } 398 return (len == 0); 399 } 400 401 static int valid_cc(const void *bc, int len, int cc) 402 { 403 while (len >= 0) { 404 const struct inet_diag_bc_op *op = bc; 405 406 if (cc > len) 407 return 0; 408 if (cc == len) 409 return 1; 410 if (op->yes < 4) 411 return 0; 412 len -= op->yes; 413 bc += op->yes; 414 } 415 return 0; 416 } 417 418 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len) 419 { 420 const unsigned char *bc = bytecode; 421 int len = bytecode_len; 422 423 while (len > 0) { 424 struct inet_diag_bc_op *op = (struct inet_diag_bc_op *)bc; 425 426 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len); 427 switch (op->code) { 428 case INET_DIAG_BC_AUTO: 429 case INET_DIAG_BC_S_COND: 430 case INET_DIAG_BC_D_COND: 431 case INET_DIAG_BC_S_GE: 432 case INET_DIAG_BC_S_LE: 433 case INET_DIAG_BC_D_GE: 434 case INET_DIAG_BC_D_LE: 435 if (op->yes < 4 || op->yes > len + 4) 436 return -EINVAL; 437 case INET_DIAG_BC_JMP: 438 if (op->no < 4 || op->no > len + 4) 439 return -EINVAL; 440 if (op->no < len && 441 !valid_cc(bytecode, bytecode_len, len - op->no)) 442 return -EINVAL; 443 break; 444 case INET_DIAG_BC_NOP: 445 if (op->yes < 4 || op->yes > len + 4) 446 return -EINVAL; 447 break; 448 default: 449 return -EINVAL; 450 } 451 bc += op->yes; 452 len -= op->yes; 453 } 454 return len == 0 ? 0 : -EINVAL; 455 } 456 457 static int inet_csk_diag_dump(struct sock *sk, 458 struct sk_buff *skb, 459 struct netlink_callback *cb) 460 { 461 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 462 463 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { 464 struct inet_diag_entry entry; 465 struct rtattr *bc = (struct rtattr *)(r + 1); 466 struct inet_sock *inet = inet_sk(sk); 467 468 entry.family = sk->sk_family; 469 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 470 if (entry.family == AF_INET6) { 471 struct ipv6_pinfo *np = inet6_sk(sk); 472 473 entry.saddr = np->rcv_saddr.s6_addr32; 474 entry.daddr = np->daddr.s6_addr32; 475 } else 476 #endif 477 { 478 entry.saddr = &inet->rcv_saddr; 479 entry.daddr = &inet->daddr; 480 } 481 entry.sport = inet->num; 482 entry.dport = ntohs(inet->dport); 483 entry.userlocks = sk->sk_userlocks; 484 485 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry)) 486 return 0; 487 } 488 489 return inet_csk_diag_fill(sk, skb, r->idiag_ext, 490 NETLINK_CB(cb->skb).pid, 491 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 492 } 493 494 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw, 495 struct sk_buff *skb, 496 struct netlink_callback *cb) 497 { 498 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 499 500 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { 501 struct inet_diag_entry entry; 502 struct rtattr *bc = (struct rtattr *)(r + 1); 503 504 entry.family = tw->tw_family; 505 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 506 if (tw->tw_family == AF_INET6) { 507 struct inet6_timewait_sock *tw6 = 508 inet6_twsk((struct sock *)tw); 509 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32; 510 entry.daddr = tw6->tw_v6_daddr.s6_addr32; 511 } else 512 #endif 513 { 514 entry.saddr = &tw->tw_rcv_saddr; 515 entry.daddr = &tw->tw_daddr; 516 } 517 entry.sport = tw->tw_num; 518 entry.dport = ntohs(tw->tw_dport); 519 entry.userlocks = 0; 520 521 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry)) 522 return 0; 523 } 524 525 return inet_twsk_diag_fill(tw, skb, r->idiag_ext, 526 NETLINK_CB(cb->skb).pid, 527 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 528 } 529 530 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk, 531 struct request_sock *req, u32 pid, u32 seq, 532 const struct nlmsghdr *unlh) 533 { 534 const struct inet_request_sock *ireq = inet_rsk(req); 535 struct inet_sock *inet = inet_sk(sk); 536 unsigned char *b = skb->tail; 537 struct inet_diag_msg *r; 538 struct nlmsghdr *nlh; 539 long tmo; 540 541 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); 542 nlh->nlmsg_flags = NLM_F_MULTI; 543 r = NLMSG_DATA(nlh); 544 545 r->idiag_family = sk->sk_family; 546 r->idiag_state = TCP_SYN_RECV; 547 r->idiag_timer = 1; 548 r->idiag_retrans = req->retrans; 549 550 r->id.idiag_if = sk->sk_bound_dev_if; 551 r->id.idiag_cookie[0] = (u32)(unsigned long)req; 552 r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1); 553 554 tmo = req->expires - jiffies; 555 if (tmo < 0) 556 tmo = 0; 557 558 r->id.idiag_sport = inet->sport; 559 r->id.idiag_dport = ireq->rmt_port; 560 r->id.idiag_src[0] = ireq->loc_addr; 561 r->id.idiag_dst[0] = ireq->rmt_addr; 562 r->idiag_expires = jiffies_to_msecs(tmo); 563 r->idiag_rqueue = 0; 564 r->idiag_wqueue = 0; 565 r->idiag_uid = sock_i_uid(sk); 566 r->idiag_inode = 0; 567 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 568 if (r->idiag_family == AF_INET6) { 569 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, 570 &inet6_rsk(req)->loc_addr); 571 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, 572 &inet6_rsk(req)->rmt_addr); 573 } 574 #endif 575 nlh->nlmsg_len = skb->tail - b; 576 577 return skb->len; 578 579 nlmsg_failure: 580 skb_trim(skb, b - skb->data); 581 return -1; 582 } 583 584 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk, 585 struct netlink_callback *cb) 586 { 587 struct inet_diag_entry entry; 588 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 589 struct inet_connection_sock *icsk = inet_csk(sk); 590 struct listen_sock *lopt; 591 struct rtattr *bc = NULL; 592 struct inet_sock *inet = inet_sk(sk); 593 int j, s_j; 594 int reqnum, s_reqnum; 595 int err = 0; 596 597 s_j = cb->args[3]; 598 s_reqnum = cb->args[4]; 599 600 if (s_j > 0) 601 s_j--; 602 603 entry.family = sk->sk_family; 604 605 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 606 607 lopt = icsk->icsk_accept_queue.listen_opt; 608 if (!lopt || !lopt->qlen) 609 goto out; 610 611 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { 612 bc = (struct rtattr *)(r + 1); 613 entry.sport = inet->num; 614 entry.userlocks = sk->sk_userlocks; 615 } 616 617 for (j = s_j; j < lopt->nr_table_entries; j++) { 618 struct request_sock *req, *head = lopt->syn_table[j]; 619 620 reqnum = 0; 621 for (req = head; req; reqnum++, req = req->dl_next) { 622 struct inet_request_sock *ireq = inet_rsk(req); 623 624 if (reqnum < s_reqnum) 625 continue; 626 if (r->id.idiag_dport != ireq->rmt_port && 627 r->id.idiag_dport) 628 continue; 629 630 if (bc) { 631 entry.saddr = 632 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 633 (entry.family == AF_INET6) ? 634 inet6_rsk(req)->loc_addr.s6_addr32 : 635 #endif 636 &ireq->loc_addr; 637 entry.daddr = 638 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 639 (entry.family == AF_INET6) ? 640 inet6_rsk(req)->rmt_addr.s6_addr32 : 641 #endif 642 &ireq->rmt_addr; 643 entry.dport = ntohs(ireq->rmt_port); 644 645 if (!inet_diag_bc_run(RTA_DATA(bc), 646 RTA_PAYLOAD(bc), &entry)) 647 continue; 648 } 649 650 err = inet_diag_fill_req(skb, sk, req, 651 NETLINK_CB(cb->skb).pid, 652 cb->nlh->nlmsg_seq, cb->nlh); 653 if (err < 0) { 654 cb->args[3] = j + 1; 655 cb->args[4] = reqnum; 656 goto out; 657 } 658 } 659 660 s_reqnum = 0; 661 } 662 663 out: 664 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 665 666 return err; 667 } 668 669 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) 670 { 671 int i, num; 672 int s_i, s_num; 673 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 674 const struct inet_diag_handler *handler; 675 struct inet_hashinfo *hashinfo; 676 677 handler = inet_diag_table[cb->nlh->nlmsg_type]; 678 BUG_ON(handler == NULL); 679 hashinfo = handler->idiag_hashinfo; 680 681 s_i = cb->args[1]; 682 s_num = num = cb->args[2]; 683 684 if (cb->args[0] == 0) { 685 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV))) 686 goto skip_listen_ht; 687 688 inet_listen_lock(hashinfo); 689 for (i = s_i; i < INET_LHTABLE_SIZE; i++) { 690 struct sock *sk; 691 struct hlist_node *node; 692 693 num = 0; 694 sk_for_each(sk, node, &hashinfo->listening_hash[i]) { 695 struct inet_sock *inet = inet_sk(sk); 696 697 if (num < s_num) { 698 num++; 699 continue; 700 } 701 702 if (r->id.idiag_sport != inet->sport && 703 r->id.idiag_sport) 704 goto next_listen; 705 706 if (!(r->idiag_states & TCPF_LISTEN) || 707 r->id.idiag_dport || 708 cb->args[3] > 0) 709 goto syn_recv; 710 711 if (inet_csk_diag_dump(sk, skb, cb) < 0) { 712 inet_listen_unlock(hashinfo); 713 goto done; 714 } 715 716 syn_recv: 717 if (!(r->idiag_states & TCPF_SYN_RECV)) 718 goto next_listen; 719 720 if (inet_diag_dump_reqs(skb, sk, cb) < 0) { 721 inet_listen_unlock(hashinfo); 722 goto done; 723 } 724 725 next_listen: 726 cb->args[3] = 0; 727 cb->args[4] = 0; 728 ++num; 729 } 730 731 s_num = 0; 732 cb->args[3] = 0; 733 cb->args[4] = 0; 734 } 735 inet_listen_unlock(hashinfo); 736 skip_listen_ht: 737 cb->args[0] = 1; 738 s_i = num = s_num = 0; 739 } 740 741 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV))) 742 return skb->len; 743 744 for (i = s_i; i < hashinfo->ehash_size; i++) { 745 struct inet_ehash_bucket *head = &hashinfo->ehash[i]; 746 struct sock *sk; 747 struct hlist_node *node; 748 749 if (i > s_i) 750 s_num = 0; 751 752 read_lock_bh(&head->lock); 753 num = 0; 754 sk_for_each(sk, node, &head->chain) { 755 struct inet_sock *inet = inet_sk(sk); 756 757 if (num < s_num) 758 goto next_normal; 759 if (!(r->idiag_states & (1 << sk->sk_state))) 760 goto next_normal; 761 if (r->id.idiag_sport != inet->sport && 762 r->id.idiag_sport) 763 goto next_normal; 764 if (r->id.idiag_dport != inet->dport && 765 r->id.idiag_dport) 766 goto next_normal; 767 if (inet_csk_diag_dump(sk, skb, cb) < 0) { 768 read_unlock_bh(&head->lock); 769 goto done; 770 } 771 next_normal: 772 ++num; 773 } 774 775 if (r->idiag_states & TCPF_TIME_WAIT) { 776 struct inet_timewait_sock *tw; 777 778 inet_twsk_for_each(tw, node, 779 &hashinfo->ehash[i + hashinfo->ehash_size].chain) { 780 781 if (num < s_num) 782 goto next_dying; 783 if (r->id.idiag_sport != tw->tw_sport && 784 r->id.idiag_sport) 785 goto next_dying; 786 if (r->id.idiag_dport != tw->tw_dport && 787 r->id.idiag_dport) 788 goto next_dying; 789 if (inet_twsk_diag_dump(tw, skb, cb) < 0) { 790 read_unlock_bh(&head->lock); 791 goto done; 792 } 793 next_dying: 794 ++num; 795 } 796 } 797 read_unlock_bh(&head->lock); 798 } 799 800 done: 801 cb->args[1] = i; 802 cb->args[2] = num; 803 return skb->len; 804 } 805 806 static inline int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 807 { 808 if (!(nlh->nlmsg_flags&NLM_F_REQUEST)) 809 return 0; 810 811 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX) 812 goto err_inval; 813 814 if (inet_diag_table[nlh->nlmsg_type] == NULL) 815 return -ENOENT; 816 817 if (NLMSG_LENGTH(sizeof(struct inet_diag_req)) > skb->len) 818 goto err_inval; 819 820 if (nlh->nlmsg_flags&NLM_F_DUMP) { 821 if (nlh->nlmsg_len > 822 (4 + NLMSG_SPACE(sizeof(struct inet_diag_req)))) { 823 struct rtattr *rta = (void *)(NLMSG_DATA(nlh) + 824 sizeof(struct inet_diag_req)); 825 if (rta->rta_type != INET_DIAG_REQ_BYTECODE || 826 rta->rta_len < 8 || 827 rta->rta_len > 828 (nlh->nlmsg_len - 829 NLMSG_SPACE(sizeof(struct inet_diag_req)))) 830 goto err_inval; 831 if (inet_diag_bc_audit(RTA_DATA(rta), RTA_PAYLOAD(rta))) 832 goto err_inval; 833 } 834 return netlink_dump_start(idiagnl, skb, nlh, 835 inet_diag_dump, NULL); 836 } else 837 return inet_diag_get_exact(skb, nlh); 838 839 err_inval: 840 return -EINVAL; 841 } 842 843 844 static inline void inet_diag_rcv_skb(struct sk_buff *skb) 845 { 846 if (skb->len >= NLMSG_SPACE(0)) { 847 int err; 848 struct nlmsghdr *nlh = (struct nlmsghdr *)skb->data; 849 850 if (nlh->nlmsg_len < sizeof(*nlh) || 851 skb->len < nlh->nlmsg_len) 852 return; 853 err = inet_diag_rcv_msg(skb, nlh); 854 if (err || nlh->nlmsg_flags & NLM_F_ACK) 855 netlink_ack(skb, nlh, err); 856 } 857 } 858 859 static void inet_diag_rcv(struct sock *sk, int len) 860 { 861 struct sk_buff *skb; 862 unsigned int qlen = skb_queue_len(&sk->sk_receive_queue); 863 864 while (qlen-- && (skb = skb_dequeue(&sk->sk_receive_queue))) { 865 inet_diag_rcv_skb(skb); 866 kfree_skb(skb); 867 } 868 } 869 870 static DEFINE_SPINLOCK(inet_diag_register_lock); 871 872 int inet_diag_register(const struct inet_diag_handler *h) 873 { 874 const __u16 type = h->idiag_type; 875 int err = -EINVAL; 876 877 if (type >= INET_DIAG_GETSOCK_MAX) 878 goto out; 879 880 spin_lock(&inet_diag_register_lock); 881 err = -EEXIST; 882 if (inet_diag_table[type] == NULL) { 883 inet_diag_table[type] = h; 884 err = 0; 885 } 886 spin_unlock(&inet_diag_register_lock); 887 out: 888 return err; 889 } 890 EXPORT_SYMBOL_GPL(inet_diag_register); 891 892 void inet_diag_unregister(const struct inet_diag_handler *h) 893 { 894 const __u16 type = h->idiag_type; 895 896 if (type >= INET_DIAG_GETSOCK_MAX) 897 return; 898 899 spin_lock(&inet_diag_register_lock); 900 inet_diag_table[type] = NULL; 901 spin_unlock(&inet_diag_register_lock); 902 903 synchronize_rcu(); 904 } 905 EXPORT_SYMBOL_GPL(inet_diag_unregister); 906 907 static int __init inet_diag_init(void) 908 { 909 const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX * 910 sizeof(struct inet_diag_handler *)); 911 int err = -ENOMEM; 912 913 inet_diag_table = kmalloc(inet_diag_table_size, GFP_KERNEL); 914 if (!inet_diag_table) 915 goto out; 916 917 memset(inet_diag_table, 0, inet_diag_table_size); 918 idiagnl = netlink_kernel_create(NETLINK_INET_DIAG, 0, inet_diag_rcv, 919 THIS_MODULE); 920 if (idiagnl == NULL) 921 goto out_free_table; 922 err = 0; 923 out: 924 return err; 925 out_free_table: 926 kfree(inet_diag_table); 927 goto out; 928 } 929 930 static void __exit inet_diag_exit(void) 931 { 932 sock_release(idiagnl->sk_socket); 933 kfree(inet_diag_table); 934 } 935 936 module_init(inet_diag_init); 937 module_exit(inet_diag_exit); 938 MODULE_LICENSE("GPL"); 939