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 DEFINE_MUTEX(inet_diag_table_mutex); 55 56 static const struct inet_diag_handler *inet_diag_lock_handler(int type) 57 { 58 #ifdef CONFIG_KMOD 59 if (!inet_diag_table[type]) 60 request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK, 61 NETLINK_INET_DIAG, type); 62 #endif 63 64 mutex_lock(&inet_diag_table_mutex); 65 if (!inet_diag_table[type]) 66 return ERR_PTR(-ENOENT); 67 68 return inet_diag_table[type]; 69 } 70 71 static inline void inet_diag_unlock_handler( 72 const struct inet_diag_handler *handler) 73 { 74 mutex_unlock(&inet_diag_table_mutex); 75 } 76 77 static int inet_csk_diag_fill(struct sock *sk, 78 struct sk_buff *skb, 79 int ext, u32 pid, u32 seq, u16 nlmsg_flags, 80 const struct nlmsghdr *unlh) 81 { 82 const struct inet_sock *inet = inet_sk(sk); 83 const struct inet_connection_sock *icsk = inet_csk(sk); 84 struct inet_diag_msg *r; 85 struct nlmsghdr *nlh; 86 void *info = NULL; 87 struct inet_diag_meminfo *minfo = NULL; 88 unsigned char *b = skb_tail_pointer(skb); 89 const struct inet_diag_handler *handler; 90 91 handler = inet_diag_table[unlh->nlmsg_type]; 92 BUG_ON(handler == NULL); 93 94 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); 95 nlh->nlmsg_flags = nlmsg_flags; 96 97 r = NLMSG_DATA(nlh); 98 BUG_ON(sk->sk_state == TCP_TIME_WAIT); 99 100 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) 101 minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo)); 102 103 if (ext & (1 << (INET_DIAG_INFO - 1))) 104 info = INET_DIAG_PUT(skb, INET_DIAG_INFO, 105 handler->idiag_info_size); 106 107 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) { 108 const size_t len = strlen(icsk->icsk_ca_ops->name); 109 110 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1), 111 icsk->icsk_ca_ops->name); 112 } 113 114 r->idiag_family = sk->sk_family; 115 r->idiag_state = sk->sk_state; 116 r->idiag_timer = 0; 117 r->idiag_retrans = 0; 118 119 r->id.idiag_if = sk->sk_bound_dev_if; 120 r->id.idiag_cookie[0] = (u32)(unsigned long)sk; 121 r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1); 122 123 r->id.idiag_sport = inet->sport; 124 r->id.idiag_dport = inet->dport; 125 r->id.idiag_src[0] = inet->rcv_saddr; 126 r->id.idiag_dst[0] = inet->daddr; 127 128 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 129 if (r->idiag_family == AF_INET6) { 130 struct ipv6_pinfo *np = inet6_sk(sk); 131 132 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, 133 &np->rcv_saddr); 134 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, 135 &np->daddr); 136 } 137 #endif 138 139 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ) 140 141 if (icsk->icsk_pending == ICSK_TIME_RETRANS) { 142 r->idiag_timer = 1; 143 r->idiag_retrans = icsk->icsk_retransmits; 144 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 145 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { 146 r->idiag_timer = 4; 147 r->idiag_retrans = icsk->icsk_probes_out; 148 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 149 } else if (timer_pending(&sk->sk_timer)) { 150 r->idiag_timer = 2; 151 r->idiag_retrans = icsk->icsk_probes_out; 152 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires); 153 } else { 154 r->idiag_timer = 0; 155 r->idiag_expires = 0; 156 } 157 #undef EXPIRES_IN_MS 158 159 r->idiag_uid = sock_i_uid(sk); 160 r->idiag_inode = sock_i_ino(sk); 161 162 if (minfo) { 163 minfo->idiag_rmem = atomic_read(&sk->sk_rmem_alloc); 164 minfo->idiag_wmem = sk->sk_wmem_queued; 165 minfo->idiag_fmem = sk->sk_forward_alloc; 166 minfo->idiag_tmem = atomic_read(&sk->sk_wmem_alloc); 167 } 168 169 handler->idiag_get_info(sk, r, info); 170 171 if (sk->sk_state < TCP_TIME_WAIT && 172 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info) 173 icsk->icsk_ca_ops->get_info(sk, ext, skb); 174 175 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 176 return skb->len; 177 178 rtattr_failure: 179 nlmsg_failure: 180 nlmsg_trim(skb, b); 181 return -EMSGSIZE; 182 } 183 184 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw, 185 struct sk_buff *skb, int ext, u32 pid, 186 u32 seq, u16 nlmsg_flags, 187 const struct nlmsghdr *unlh) 188 { 189 long tmo; 190 struct inet_diag_msg *r; 191 const unsigned char *previous_tail = skb_tail_pointer(skb); 192 struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq, 193 unlh->nlmsg_type, sizeof(*r)); 194 195 r = NLMSG_DATA(nlh); 196 BUG_ON(tw->tw_state != TCP_TIME_WAIT); 197 198 nlh->nlmsg_flags = nlmsg_flags; 199 200 tmo = tw->tw_ttd - jiffies; 201 if (tmo < 0) 202 tmo = 0; 203 204 r->idiag_family = tw->tw_family; 205 r->idiag_state = tw->tw_state; 206 r->idiag_timer = 0; 207 r->idiag_retrans = 0; 208 r->id.idiag_if = tw->tw_bound_dev_if; 209 r->id.idiag_cookie[0] = (u32)(unsigned long)tw; 210 r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1); 211 r->id.idiag_sport = tw->tw_sport; 212 r->id.idiag_dport = tw->tw_dport; 213 r->id.idiag_src[0] = tw->tw_rcv_saddr; 214 r->id.idiag_dst[0] = tw->tw_daddr; 215 r->idiag_state = tw->tw_substate; 216 r->idiag_timer = 3; 217 r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ); 218 r->idiag_rqueue = 0; 219 r->idiag_wqueue = 0; 220 r->idiag_uid = 0; 221 r->idiag_inode = 0; 222 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 223 if (tw->tw_family == AF_INET6) { 224 const struct inet6_timewait_sock *tw6 = 225 inet6_twsk((struct sock *)tw); 226 227 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, 228 &tw6->tw_v6_rcv_saddr); 229 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, 230 &tw6->tw_v6_daddr); 231 } 232 #endif 233 nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail; 234 return skb->len; 235 nlmsg_failure: 236 nlmsg_trim(skb, previous_tail); 237 return -EMSGSIZE; 238 } 239 240 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, 241 int ext, u32 pid, u32 seq, u16 nlmsg_flags, 242 const struct nlmsghdr *unlh) 243 { 244 if (sk->sk_state == TCP_TIME_WAIT) 245 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk, 246 skb, ext, pid, seq, nlmsg_flags, 247 unlh); 248 return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh); 249 } 250 251 static int inet_diag_get_exact(struct sk_buff *in_skb, 252 const struct nlmsghdr *nlh) 253 { 254 int err; 255 struct sock *sk; 256 struct inet_diag_req *req = NLMSG_DATA(nlh); 257 struct sk_buff *rep; 258 struct inet_hashinfo *hashinfo; 259 const struct inet_diag_handler *handler; 260 261 handler = inet_diag_lock_handler(nlh->nlmsg_type); 262 if (IS_ERR(handler)) { 263 err = PTR_ERR(handler); 264 goto unlock; 265 } 266 267 hashinfo = handler->idiag_hashinfo; 268 err = -EINVAL; 269 270 if (req->idiag_family == AF_INET) { 271 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0], 272 req->id.idiag_dport, req->id.idiag_src[0], 273 req->id.idiag_sport, req->id.idiag_if); 274 } 275 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 276 else if (req->idiag_family == AF_INET6) { 277 sk = inet6_lookup(&init_net, hashinfo, 278 (struct in6_addr *)req->id.idiag_dst, 279 req->id.idiag_dport, 280 (struct in6_addr *)req->id.idiag_src, 281 req->id.idiag_sport, 282 req->id.idiag_if); 283 } 284 #endif 285 else { 286 goto unlock; 287 } 288 289 err = -ENOENT; 290 if (sk == NULL) 291 goto unlock; 292 293 err = -ESTALE; 294 if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE || 295 req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) && 296 ((u32)(unsigned long)sk != req->id.idiag_cookie[0] || 297 (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1])) 298 goto out; 299 300 err = -ENOMEM; 301 rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) + 302 sizeof(struct inet_diag_meminfo) + 303 handler->idiag_info_size + 64)), 304 GFP_KERNEL); 305 if (!rep) 306 goto out; 307 308 err = sk_diag_fill(sk, rep, req->idiag_ext, 309 NETLINK_CB(in_skb).pid, 310 nlh->nlmsg_seq, 0, nlh); 311 if (err < 0) { 312 WARN_ON(err == -EMSGSIZE); 313 kfree_skb(rep); 314 goto out; 315 } 316 err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid, 317 MSG_DONTWAIT); 318 if (err > 0) 319 err = 0; 320 321 out: 322 if (sk) { 323 if (sk->sk_state == TCP_TIME_WAIT) 324 inet_twsk_put((struct inet_timewait_sock *)sk); 325 else 326 sock_put(sk); 327 } 328 unlock: 329 inet_diag_unlock_handler(handler); 330 return err; 331 } 332 333 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits) 334 { 335 int words = bits >> 5; 336 337 bits &= 0x1f; 338 339 if (words) { 340 if (memcmp(a1, a2, words << 2)) 341 return 0; 342 } 343 if (bits) { 344 __be32 w1, w2; 345 __be32 mask; 346 347 w1 = a1[words]; 348 w2 = a2[words]; 349 350 mask = htonl((0xffffffff) << (32 - bits)); 351 352 if ((w1 ^ w2) & mask) 353 return 0; 354 } 355 356 return 1; 357 } 358 359 360 static int inet_diag_bc_run(const void *bc, int len, 361 const struct inet_diag_entry *entry) 362 { 363 while (len > 0) { 364 int yes = 1; 365 const struct inet_diag_bc_op *op = bc; 366 367 switch (op->code) { 368 case INET_DIAG_BC_NOP: 369 break; 370 case INET_DIAG_BC_JMP: 371 yes = 0; 372 break; 373 case INET_DIAG_BC_S_GE: 374 yes = entry->sport >= op[1].no; 375 break; 376 case INET_DIAG_BC_S_LE: 377 yes = entry->dport <= op[1].no; 378 break; 379 case INET_DIAG_BC_D_GE: 380 yes = entry->dport >= op[1].no; 381 break; 382 case INET_DIAG_BC_D_LE: 383 yes = entry->dport <= op[1].no; 384 break; 385 case INET_DIAG_BC_AUTO: 386 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); 387 break; 388 case INET_DIAG_BC_S_COND: 389 case INET_DIAG_BC_D_COND: { 390 struct inet_diag_hostcond *cond; 391 __be32 *addr; 392 393 cond = (struct inet_diag_hostcond *)(op + 1); 394 if (cond->port != -1 && 395 cond->port != (op->code == INET_DIAG_BC_S_COND ? 396 entry->sport : entry->dport)) { 397 yes = 0; 398 break; 399 } 400 401 if (cond->prefix_len == 0) 402 break; 403 404 if (op->code == INET_DIAG_BC_S_COND) 405 addr = entry->saddr; 406 else 407 addr = entry->daddr; 408 409 if (bitstring_match(addr, cond->addr, 410 cond->prefix_len)) 411 break; 412 if (entry->family == AF_INET6 && 413 cond->family == AF_INET) { 414 if (addr[0] == 0 && addr[1] == 0 && 415 addr[2] == htonl(0xffff) && 416 bitstring_match(addr + 3, cond->addr, 417 cond->prefix_len)) 418 break; 419 } 420 yes = 0; 421 break; 422 } 423 } 424 425 if (yes) { 426 len -= op->yes; 427 bc += op->yes; 428 } else { 429 len -= op->no; 430 bc += op->no; 431 } 432 } 433 return (len == 0); 434 } 435 436 static int valid_cc(const void *bc, int len, int cc) 437 { 438 while (len >= 0) { 439 const struct inet_diag_bc_op *op = bc; 440 441 if (cc > len) 442 return 0; 443 if (cc == len) 444 return 1; 445 if (op->yes < 4) 446 return 0; 447 len -= op->yes; 448 bc += op->yes; 449 } 450 return 0; 451 } 452 453 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len) 454 { 455 const unsigned char *bc = bytecode; 456 int len = bytecode_len; 457 458 while (len > 0) { 459 struct inet_diag_bc_op *op = (struct inet_diag_bc_op *)bc; 460 461 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len); 462 switch (op->code) { 463 case INET_DIAG_BC_AUTO: 464 case INET_DIAG_BC_S_COND: 465 case INET_DIAG_BC_D_COND: 466 case INET_DIAG_BC_S_GE: 467 case INET_DIAG_BC_S_LE: 468 case INET_DIAG_BC_D_GE: 469 case INET_DIAG_BC_D_LE: 470 if (op->yes < 4 || op->yes > len + 4) 471 return -EINVAL; 472 case INET_DIAG_BC_JMP: 473 if (op->no < 4 || op->no > len + 4) 474 return -EINVAL; 475 if (op->no < len && 476 !valid_cc(bytecode, bytecode_len, len - op->no)) 477 return -EINVAL; 478 break; 479 case INET_DIAG_BC_NOP: 480 if (op->yes < 4 || op->yes > len + 4) 481 return -EINVAL; 482 break; 483 default: 484 return -EINVAL; 485 } 486 bc += op->yes; 487 len -= op->yes; 488 } 489 return len == 0 ? 0 : -EINVAL; 490 } 491 492 static int inet_csk_diag_dump(struct sock *sk, 493 struct sk_buff *skb, 494 struct netlink_callback *cb) 495 { 496 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 497 498 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { 499 struct inet_diag_entry entry; 500 struct rtattr *bc = (struct rtattr *)(r + 1); 501 struct inet_sock *inet = inet_sk(sk); 502 503 entry.family = sk->sk_family; 504 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 505 if (entry.family == AF_INET6) { 506 struct ipv6_pinfo *np = inet6_sk(sk); 507 508 entry.saddr = np->rcv_saddr.s6_addr32; 509 entry.daddr = np->daddr.s6_addr32; 510 } else 511 #endif 512 { 513 entry.saddr = &inet->rcv_saddr; 514 entry.daddr = &inet->daddr; 515 } 516 entry.sport = inet->num; 517 entry.dport = ntohs(inet->dport); 518 entry.userlocks = sk->sk_userlocks; 519 520 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry)) 521 return 0; 522 } 523 524 return inet_csk_diag_fill(sk, skb, r->idiag_ext, 525 NETLINK_CB(cb->skb).pid, 526 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 527 } 528 529 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw, 530 struct sk_buff *skb, 531 struct netlink_callback *cb) 532 { 533 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 534 535 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { 536 struct inet_diag_entry entry; 537 struct rtattr *bc = (struct rtattr *)(r + 1); 538 539 entry.family = tw->tw_family; 540 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 541 if (tw->tw_family == AF_INET6) { 542 struct inet6_timewait_sock *tw6 = 543 inet6_twsk((struct sock *)tw); 544 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32; 545 entry.daddr = tw6->tw_v6_daddr.s6_addr32; 546 } else 547 #endif 548 { 549 entry.saddr = &tw->tw_rcv_saddr; 550 entry.daddr = &tw->tw_daddr; 551 } 552 entry.sport = tw->tw_num; 553 entry.dport = ntohs(tw->tw_dport); 554 entry.userlocks = 0; 555 556 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry)) 557 return 0; 558 } 559 560 return inet_twsk_diag_fill(tw, skb, r->idiag_ext, 561 NETLINK_CB(cb->skb).pid, 562 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 563 } 564 565 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk, 566 struct request_sock *req, u32 pid, u32 seq, 567 const struct nlmsghdr *unlh) 568 { 569 const struct inet_request_sock *ireq = inet_rsk(req); 570 struct inet_sock *inet = inet_sk(sk); 571 unsigned char *b = skb_tail_pointer(skb); 572 struct inet_diag_msg *r; 573 struct nlmsghdr *nlh; 574 long tmo; 575 576 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); 577 nlh->nlmsg_flags = NLM_F_MULTI; 578 r = NLMSG_DATA(nlh); 579 580 r->idiag_family = sk->sk_family; 581 r->idiag_state = TCP_SYN_RECV; 582 r->idiag_timer = 1; 583 r->idiag_retrans = req->retrans; 584 585 r->id.idiag_if = sk->sk_bound_dev_if; 586 r->id.idiag_cookie[0] = (u32)(unsigned long)req; 587 r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1); 588 589 tmo = req->expires - jiffies; 590 if (tmo < 0) 591 tmo = 0; 592 593 r->id.idiag_sport = inet->sport; 594 r->id.idiag_dport = ireq->rmt_port; 595 r->id.idiag_src[0] = ireq->loc_addr; 596 r->id.idiag_dst[0] = ireq->rmt_addr; 597 r->idiag_expires = jiffies_to_msecs(tmo); 598 r->idiag_rqueue = 0; 599 r->idiag_wqueue = 0; 600 r->idiag_uid = sock_i_uid(sk); 601 r->idiag_inode = 0; 602 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 603 if (r->idiag_family == AF_INET6) { 604 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, 605 &inet6_rsk(req)->loc_addr); 606 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, 607 &inet6_rsk(req)->rmt_addr); 608 } 609 #endif 610 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 611 612 return skb->len; 613 614 nlmsg_failure: 615 nlmsg_trim(skb, b); 616 return -1; 617 } 618 619 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk, 620 struct netlink_callback *cb) 621 { 622 struct inet_diag_entry entry; 623 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 624 struct inet_connection_sock *icsk = inet_csk(sk); 625 struct listen_sock *lopt; 626 struct rtattr *bc = NULL; 627 struct inet_sock *inet = inet_sk(sk); 628 int j, s_j; 629 int reqnum, s_reqnum; 630 int err = 0; 631 632 s_j = cb->args[3]; 633 s_reqnum = cb->args[4]; 634 635 if (s_j > 0) 636 s_j--; 637 638 entry.family = sk->sk_family; 639 640 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 641 642 lopt = icsk->icsk_accept_queue.listen_opt; 643 if (!lopt || !lopt->qlen) 644 goto out; 645 646 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { 647 bc = (struct rtattr *)(r + 1); 648 entry.sport = inet->num; 649 entry.userlocks = sk->sk_userlocks; 650 } 651 652 for (j = s_j; j < lopt->nr_table_entries; j++) { 653 struct request_sock *req, *head = lopt->syn_table[j]; 654 655 reqnum = 0; 656 for (req = head; req; reqnum++, req = req->dl_next) { 657 struct inet_request_sock *ireq = inet_rsk(req); 658 659 if (reqnum < s_reqnum) 660 continue; 661 if (r->id.idiag_dport != ireq->rmt_port && 662 r->id.idiag_dport) 663 continue; 664 665 if (bc) { 666 entry.saddr = 667 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 668 (entry.family == AF_INET6) ? 669 inet6_rsk(req)->loc_addr.s6_addr32 : 670 #endif 671 &ireq->loc_addr; 672 entry.daddr = 673 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 674 (entry.family == AF_INET6) ? 675 inet6_rsk(req)->rmt_addr.s6_addr32 : 676 #endif 677 &ireq->rmt_addr; 678 entry.dport = ntohs(ireq->rmt_port); 679 680 if (!inet_diag_bc_run(RTA_DATA(bc), 681 RTA_PAYLOAD(bc), &entry)) 682 continue; 683 } 684 685 err = inet_diag_fill_req(skb, sk, req, 686 NETLINK_CB(cb->skb).pid, 687 cb->nlh->nlmsg_seq, cb->nlh); 688 if (err < 0) { 689 cb->args[3] = j + 1; 690 cb->args[4] = reqnum; 691 goto out; 692 } 693 } 694 695 s_reqnum = 0; 696 } 697 698 out: 699 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 700 701 return err; 702 } 703 704 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) 705 { 706 int i, num; 707 int s_i, s_num; 708 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 709 const struct inet_diag_handler *handler; 710 struct inet_hashinfo *hashinfo; 711 712 handler = inet_diag_lock_handler(cb->nlh->nlmsg_type); 713 if (IS_ERR(handler)) 714 goto unlock; 715 716 hashinfo = handler->idiag_hashinfo; 717 718 s_i = cb->args[1]; 719 s_num = num = cb->args[2]; 720 721 if (cb->args[0] == 0) { 722 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV))) 723 goto skip_listen_ht; 724 725 inet_listen_lock(hashinfo); 726 for (i = s_i; i < INET_LHTABLE_SIZE; i++) { 727 struct sock *sk; 728 struct hlist_node *node; 729 730 num = 0; 731 sk_for_each(sk, node, &hashinfo->listening_hash[i]) { 732 struct inet_sock *inet = inet_sk(sk); 733 734 if (num < s_num) { 735 num++; 736 continue; 737 } 738 739 if (r->id.idiag_sport != inet->sport && 740 r->id.idiag_sport) 741 goto next_listen; 742 743 if (!(r->idiag_states & TCPF_LISTEN) || 744 r->id.idiag_dport || 745 cb->args[3] > 0) 746 goto syn_recv; 747 748 if (inet_csk_diag_dump(sk, skb, cb) < 0) { 749 inet_listen_unlock(hashinfo); 750 goto done; 751 } 752 753 syn_recv: 754 if (!(r->idiag_states & TCPF_SYN_RECV)) 755 goto next_listen; 756 757 if (inet_diag_dump_reqs(skb, sk, cb) < 0) { 758 inet_listen_unlock(hashinfo); 759 goto done; 760 } 761 762 next_listen: 763 cb->args[3] = 0; 764 cb->args[4] = 0; 765 ++num; 766 } 767 768 s_num = 0; 769 cb->args[3] = 0; 770 cb->args[4] = 0; 771 } 772 inet_listen_unlock(hashinfo); 773 skip_listen_ht: 774 cb->args[0] = 1; 775 s_i = num = s_num = 0; 776 } 777 778 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV))) 779 goto unlock; 780 781 for (i = s_i; i < hashinfo->ehash_size; i++) { 782 struct inet_ehash_bucket *head = &hashinfo->ehash[i]; 783 rwlock_t *lock = inet_ehash_lockp(hashinfo, i); 784 struct sock *sk; 785 struct hlist_node *node; 786 787 if (i > s_i) 788 s_num = 0; 789 790 read_lock_bh(lock); 791 num = 0; 792 sk_for_each(sk, node, &head->chain) { 793 struct inet_sock *inet = inet_sk(sk); 794 795 if (num < s_num) 796 goto next_normal; 797 if (!(r->idiag_states & (1 << sk->sk_state))) 798 goto next_normal; 799 if (r->id.idiag_sport != inet->sport && 800 r->id.idiag_sport) 801 goto next_normal; 802 if (r->id.idiag_dport != inet->dport && 803 r->id.idiag_dport) 804 goto next_normal; 805 if (inet_csk_diag_dump(sk, skb, cb) < 0) { 806 read_unlock_bh(lock); 807 goto done; 808 } 809 next_normal: 810 ++num; 811 } 812 813 if (r->idiag_states & TCPF_TIME_WAIT) { 814 struct inet_timewait_sock *tw; 815 816 inet_twsk_for_each(tw, node, 817 &head->twchain) { 818 819 if (num < s_num) 820 goto next_dying; 821 if (r->id.idiag_sport != tw->tw_sport && 822 r->id.idiag_sport) 823 goto next_dying; 824 if (r->id.idiag_dport != tw->tw_dport && 825 r->id.idiag_dport) 826 goto next_dying; 827 if (inet_twsk_diag_dump(tw, skb, cb) < 0) { 828 read_unlock_bh(lock); 829 goto done; 830 } 831 next_dying: 832 ++num; 833 } 834 } 835 read_unlock_bh(lock); 836 } 837 838 done: 839 cb->args[1] = i; 840 cb->args[2] = num; 841 unlock: 842 inet_diag_unlock_handler(handler); 843 return skb->len; 844 } 845 846 static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 847 { 848 int hdrlen = sizeof(struct inet_diag_req); 849 850 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX || 851 nlmsg_len(nlh) < hdrlen) 852 return -EINVAL; 853 854 if (nlh->nlmsg_flags & NLM_F_DUMP) { 855 if (nlmsg_attrlen(nlh, hdrlen)) { 856 struct nlattr *attr; 857 858 attr = nlmsg_find_attr(nlh, hdrlen, 859 INET_DIAG_REQ_BYTECODE); 860 if (attr == NULL || 861 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 862 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 863 return -EINVAL; 864 } 865 866 return netlink_dump_start(idiagnl, skb, nlh, 867 inet_diag_dump, NULL); 868 } 869 870 return inet_diag_get_exact(skb, nlh); 871 } 872 873 static DEFINE_MUTEX(inet_diag_mutex); 874 875 static void inet_diag_rcv(struct sk_buff *skb) 876 { 877 mutex_lock(&inet_diag_mutex); 878 netlink_rcv_skb(skb, &inet_diag_rcv_msg); 879 mutex_unlock(&inet_diag_mutex); 880 } 881 882 int inet_diag_register(const struct inet_diag_handler *h) 883 { 884 const __u16 type = h->idiag_type; 885 int err = -EINVAL; 886 887 if (type >= INET_DIAG_GETSOCK_MAX) 888 goto out; 889 890 mutex_lock(&inet_diag_table_mutex); 891 err = -EEXIST; 892 if (inet_diag_table[type] == NULL) { 893 inet_diag_table[type] = h; 894 err = 0; 895 } 896 mutex_unlock(&inet_diag_table_mutex); 897 out: 898 return err; 899 } 900 EXPORT_SYMBOL_GPL(inet_diag_register); 901 902 void inet_diag_unregister(const struct inet_diag_handler *h) 903 { 904 const __u16 type = h->idiag_type; 905 906 if (type >= INET_DIAG_GETSOCK_MAX) 907 return; 908 909 mutex_lock(&inet_diag_table_mutex); 910 inet_diag_table[type] = NULL; 911 mutex_unlock(&inet_diag_table_mutex); 912 } 913 EXPORT_SYMBOL_GPL(inet_diag_unregister); 914 915 static int __init inet_diag_init(void) 916 { 917 const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX * 918 sizeof(struct inet_diag_handler *)); 919 int err = -ENOMEM; 920 921 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL); 922 if (!inet_diag_table) 923 goto out; 924 925 idiagnl = netlink_kernel_create(&init_net, NETLINK_INET_DIAG, 0, 926 inet_diag_rcv, NULL, THIS_MODULE); 927 if (idiagnl == NULL) 928 goto out_free_table; 929 err = 0; 930 out: 931 return err; 932 out_free_table: 933 kfree(inet_diag_table); 934 goto out; 935 } 936 937 static void __exit inet_diag_exit(void) 938 { 939 netlink_kernel_release(idiagnl); 940 kfree(inet_diag_table); 941 } 942 943 module_init(inet_diag_init); 944 module_exit(inet_diag_exit); 945 MODULE_LICENSE("GPL"); 946 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_INET_DIAG); 947