inet_diag.c revision eeb1497277d6b1a0a34ed36b97e18f2bd7d6de0d
1/* 2 * inet_diag.c Module for monitoring INET transport protocols sockets. 3 * 4 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11 12#include <linux/kernel.h> 13#include <linux/module.h> 14#include <linux/types.h> 15#include <linux/fcntl.h> 16#include <linux/random.h> 17#include <linux/slab.h> 18#include <linux/cache.h> 19#include <linux/init.h> 20#include <linux/time.h> 21 22#include <net/icmp.h> 23#include <net/tcp.h> 24#include <net/ipv6.h> 25#include <net/inet_common.h> 26#include <net/inet_connection_sock.h> 27#include <net/inet_hashtables.h> 28#include <net/inet_timewait_sock.h> 29#include <net/inet6_hashtables.h> 30#include <net/netlink.h> 31 32#include <linux/inet.h> 33#include <linux/stddef.h> 34 35#include <linux/inet_diag.h> 36 37static const struct inet_diag_handler **inet_diag_table; 38 39struct inet_diag_entry { 40 __be32 *saddr; 41 __be32 *daddr; 42 u16 sport; 43 u16 dport; 44 u16 family; 45 u16 userlocks; 46}; 47 48static struct sock *idiagnl; 49 50#define INET_DIAG_PUT(skb, attrtype, attrlen) \ 51 RTA_DATA(__RTA_PUT(skb, attrtype, attrlen)) 52 53static DEFINE_MUTEX(inet_diag_table_mutex); 54 55static const struct inet_diag_handler *inet_diag_lock_handler(int type) 56{ 57 if (!inet_diag_table[type]) 58 request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK, 59 NETLINK_INET_DIAG, type); 60 61 mutex_lock(&inet_diag_table_mutex); 62 if (!inet_diag_table[type]) 63 return ERR_PTR(-ENOENT); 64 65 return inet_diag_table[type]; 66} 67 68static inline void inet_diag_unlock_handler( 69 const struct inet_diag_handler *handler) 70{ 71 mutex_unlock(&inet_diag_table_mutex); 72} 73 74static int inet_csk_diag_fill(struct sock *sk, 75 struct sk_buff *skb, 76 int ext, u32 pid, u32 seq, u16 nlmsg_flags, 77 const struct nlmsghdr *unlh) 78{ 79 const struct inet_sock *inet = inet_sk(sk); 80 const struct inet_connection_sock *icsk = inet_csk(sk); 81 struct inet_diag_msg *r; 82 struct nlmsghdr *nlh; 83 void *info = NULL; 84 struct inet_diag_meminfo *minfo = NULL; 85 unsigned char *b = skb_tail_pointer(skb); 86 const struct inet_diag_handler *handler; 87 88 handler = inet_diag_table[unlh->nlmsg_type]; 89 BUG_ON(handler == NULL); 90 91 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); 92 nlh->nlmsg_flags = nlmsg_flags; 93 94 r = NLMSG_DATA(nlh); 95 BUG_ON(sk->sk_state == TCP_TIME_WAIT); 96 97 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) 98 minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo)); 99 100 if (ext & (1 << (INET_DIAG_INFO - 1))) 101 info = INET_DIAG_PUT(skb, INET_DIAG_INFO, 102 handler->idiag_info_size); 103 104 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) { 105 const size_t len = strlen(icsk->icsk_ca_ops->name); 106 107 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1), 108 icsk->icsk_ca_ops->name); 109 } 110 111 r->idiag_family = sk->sk_family; 112 r->idiag_state = sk->sk_state; 113 r->idiag_timer = 0; 114 r->idiag_retrans = 0; 115 116 r->id.idiag_if = sk->sk_bound_dev_if; 117 r->id.idiag_cookie[0] = (u32)(unsigned long)sk; 118 r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1); 119 120 r->id.idiag_sport = inet->inet_sport; 121 r->id.idiag_dport = inet->inet_dport; 122 r->id.idiag_src[0] = inet->inet_rcv_saddr; 123 r->id.idiag_dst[0] = inet->inet_daddr; 124 125#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 126 if (r->idiag_family == AF_INET6) { 127 const struct ipv6_pinfo *np = inet6_sk(sk); 128 129 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, 130 &np->rcv_saddr); 131 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, 132 &np->daddr); 133 } 134#endif 135 136#define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ) 137 138 if (icsk->icsk_pending == ICSK_TIME_RETRANS) { 139 r->idiag_timer = 1; 140 r->idiag_retrans = icsk->icsk_retransmits; 141 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 142 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { 143 r->idiag_timer = 4; 144 r->idiag_retrans = icsk->icsk_probes_out; 145 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 146 } else if (timer_pending(&sk->sk_timer)) { 147 r->idiag_timer = 2; 148 r->idiag_retrans = icsk->icsk_probes_out; 149 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires); 150 } else { 151 r->idiag_timer = 0; 152 r->idiag_expires = 0; 153 } 154#undef EXPIRES_IN_MS 155 156 r->idiag_uid = sock_i_uid(sk); 157 r->idiag_inode = sock_i_ino(sk); 158 159 if (minfo) { 160 minfo->idiag_rmem = sk_rmem_alloc_get(sk); 161 minfo->idiag_wmem = sk->sk_wmem_queued; 162 minfo->idiag_fmem = sk->sk_forward_alloc; 163 minfo->idiag_tmem = sk_wmem_alloc_get(sk); 164 } 165 166 handler->idiag_get_info(sk, r, info); 167 168 if (sk->sk_state < TCP_TIME_WAIT && 169 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info) 170 icsk->icsk_ca_ops->get_info(sk, ext, skb); 171 172 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 173 return skb->len; 174 175rtattr_failure: 176nlmsg_failure: 177 nlmsg_trim(skb, b); 178 return -EMSGSIZE; 179} 180 181static int inet_twsk_diag_fill(struct inet_timewait_sock *tw, 182 struct sk_buff *skb, int ext, u32 pid, 183 u32 seq, u16 nlmsg_flags, 184 const struct nlmsghdr *unlh) 185{ 186 long tmo; 187 struct inet_diag_msg *r; 188 const unsigned char *previous_tail = skb_tail_pointer(skb); 189 struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq, 190 unlh->nlmsg_type, sizeof(*r)); 191 192 r = NLMSG_DATA(nlh); 193 BUG_ON(tw->tw_state != TCP_TIME_WAIT); 194 195 nlh->nlmsg_flags = nlmsg_flags; 196 197 tmo = tw->tw_ttd - jiffies; 198 if (tmo < 0) 199 tmo = 0; 200 201 r->idiag_family = tw->tw_family; 202 r->idiag_retrans = 0; 203 r->id.idiag_if = tw->tw_bound_dev_if; 204 r->id.idiag_cookie[0] = (u32)(unsigned long)tw; 205 r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1); 206 r->id.idiag_sport = tw->tw_sport; 207 r->id.idiag_dport = tw->tw_dport; 208 r->id.idiag_src[0] = tw->tw_rcv_saddr; 209 r->id.idiag_dst[0] = tw->tw_daddr; 210 r->idiag_state = tw->tw_substate; 211 r->idiag_timer = 3; 212 r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ); 213 r->idiag_rqueue = 0; 214 r->idiag_wqueue = 0; 215 r->idiag_uid = 0; 216 r->idiag_inode = 0; 217#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 218 if (tw->tw_family == AF_INET6) { 219 const struct inet6_timewait_sock *tw6 = 220 inet6_twsk((struct sock *)tw); 221 222 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, 223 &tw6->tw_v6_rcv_saddr); 224 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, 225 &tw6->tw_v6_daddr); 226 } 227#endif 228 nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail; 229 return skb->len; 230nlmsg_failure: 231 nlmsg_trim(skb, previous_tail); 232 return -EMSGSIZE; 233} 234 235static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, 236 int ext, u32 pid, u32 seq, u16 nlmsg_flags, 237 const struct nlmsghdr *unlh) 238{ 239 if (sk->sk_state == TCP_TIME_WAIT) 240 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk, 241 skb, ext, pid, seq, nlmsg_flags, 242 unlh); 243 return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh); 244} 245 246static int inet_diag_get_exact(struct sk_buff *in_skb, 247 const struct nlmsghdr *nlh) 248{ 249 int err; 250 struct sock *sk; 251 struct inet_diag_req *req = NLMSG_DATA(nlh); 252 struct sk_buff *rep; 253 struct inet_hashinfo *hashinfo; 254 const struct inet_diag_handler *handler; 255 256 handler = inet_diag_lock_handler(nlh->nlmsg_type); 257 if (IS_ERR(handler)) { 258 err = PTR_ERR(handler); 259 goto unlock; 260 } 261 262 hashinfo = handler->idiag_hashinfo; 263 err = -EINVAL; 264 265 if (req->idiag_family == AF_INET) { 266 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0], 267 req->id.idiag_dport, req->id.idiag_src[0], 268 req->id.idiag_sport, req->id.idiag_if); 269 } 270#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 271 else if (req->idiag_family == AF_INET6) { 272 sk = inet6_lookup(&init_net, hashinfo, 273 (struct in6_addr *)req->id.idiag_dst, 274 req->id.idiag_dport, 275 (struct in6_addr *)req->id.idiag_src, 276 req->id.idiag_sport, 277 req->id.idiag_if); 278 } 279#endif 280 else { 281 goto unlock; 282 } 283 284 err = -ENOENT; 285 if (sk == NULL) 286 goto unlock; 287 288 err = -ESTALE; 289 if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE || 290 req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) && 291 ((u32)(unsigned long)sk != req->id.idiag_cookie[0] || 292 (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1])) 293 goto out; 294 295 err = -ENOMEM; 296 rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) + 297 sizeof(struct inet_diag_meminfo) + 298 handler->idiag_info_size + 64)), 299 GFP_KERNEL); 300 if (!rep) 301 goto out; 302 303 err = sk_diag_fill(sk, rep, req->idiag_ext, 304 NETLINK_CB(in_skb).pid, 305 nlh->nlmsg_seq, 0, nlh); 306 if (err < 0) { 307 WARN_ON(err == -EMSGSIZE); 308 kfree_skb(rep); 309 goto out; 310 } 311 err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid, 312 MSG_DONTWAIT); 313 if (err > 0) 314 err = 0; 315 316out: 317 if (sk) { 318 if (sk->sk_state == TCP_TIME_WAIT) 319 inet_twsk_put((struct inet_timewait_sock *)sk); 320 else 321 sock_put(sk); 322 } 323unlock: 324 inet_diag_unlock_handler(handler); 325 return err; 326} 327 328static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits) 329{ 330 int words = bits >> 5; 331 332 bits &= 0x1f; 333 334 if (words) { 335 if (memcmp(a1, a2, words << 2)) 336 return 0; 337 } 338 if (bits) { 339 __be32 w1, w2; 340 __be32 mask; 341 342 w1 = a1[words]; 343 w2 = a2[words]; 344 345 mask = htonl((0xffffffff) << (32 - bits)); 346 347 if ((w1 ^ w2) & mask) 348 return 0; 349 } 350 351 return 1; 352} 353 354 355static int inet_diag_bc_run(const void *bc, int len, 356 const struct inet_diag_entry *entry) 357{ 358 while (len > 0) { 359 int yes = 1; 360 const struct inet_diag_bc_op *op = bc; 361 362 switch (op->code) { 363 case INET_DIAG_BC_NOP: 364 break; 365 case INET_DIAG_BC_JMP: 366 yes = 0; 367 break; 368 case INET_DIAG_BC_S_GE: 369 yes = entry->sport >= op[1].no; 370 break; 371 case INET_DIAG_BC_S_LE: 372 yes = entry->sport <= op[1].no; 373 break; 374 case INET_DIAG_BC_D_GE: 375 yes = entry->dport >= op[1].no; 376 break; 377 case INET_DIAG_BC_D_LE: 378 yes = entry->dport <= op[1].no; 379 break; 380 case INET_DIAG_BC_AUTO: 381 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); 382 break; 383 case INET_DIAG_BC_S_COND: 384 case INET_DIAG_BC_D_COND: { 385 struct inet_diag_hostcond *cond; 386 __be32 *addr; 387 388 cond = (struct inet_diag_hostcond *)(op + 1); 389 if (cond->port != -1 && 390 cond->port != (op->code == INET_DIAG_BC_S_COND ? 391 entry->sport : entry->dport)) { 392 yes = 0; 393 break; 394 } 395 396 if (cond->prefix_len == 0) 397 break; 398 399 if (op->code == INET_DIAG_BC_S_COND) 400 addr = entry->saddr; 401 else 402 addr = entry->daddr; 403 404 if (bitstring_match(addr, cond->addr, 405 cond->prefix_len)) 406 break; 407 if (entry->family == AF_INET6 && 408 cond->family == AF_INET) { 409 if (addr[0] == 0 && addr[1] == 0 && 410 addr[2] == htonl(0xffff) && 411 bitstring_match(addr + 3, cond->addr, 412 cond->prefix_len)) 413 break; 414 } 415 yes = 0; 416 break; 417 } 418 } 419 420 if (yes) { 421 len -= op->yes; 422 bc += op->yes; 423 } else { 424 len -= op->no; 425 bc += op->no; 426 } 427 } 428 return len == 0; 429} 430 431static int valid_cc(const void *bc, int len, int cc) 432{ 433 while (len >= 0) { 434 const struct inet_diag_bc_op *op = bc; 435 436 if (cc > len) 437 return 0; 438 if (cc == len) 439 return 1; 440 if (op->yes < 4 || op->yes & 3) 441 return 0; 442 len -= op->yes; 443 bc += op->yes; 444 } 445 return 0; 446} 447 448static int inet_diag_bc_audit(const void *bytecode, int bytecode_len) 449{ 450 const void *bc = bytecode; 451 int len = bytecode_len; 452 453 while (len > 0) { 454 const struct inet_diag_bc_op *op = bc; 455 456//printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len); 457 switch (op->code) { 458 case INET_DIAG_BC_AUTO: 459 case INET_DIAG_BC_S_COND: 460 case INET_DIAG_BC_D_COND: 461 case INET_DIAG_BC_S_GE: 462 case INET_DIAG_BC_S_LE: 463 case INET_DIAG_BC_D_GE: 464 case INET_DIAG_BC_D_LE: 465 case INET_DIAG_BC_JMP: 466 if (op->no < 4 || op->no > len + 4 || op->no & 3) 467 return -EINVAL; 468 if (op->no < len && 469 !valid_cc(bytecode, bytecode_len, len - op->no)) 470 return -EINVAL; 471 break; 472 case INET_DIAG_BC_NOP: 473 break; 474 default: 475 return -EINVAL; 476 } 477 if (op->yes < 4 || op->yes > len + 4 || op->yes & 3) 478 return -EINVAL; 479 bc += op->yes; 480 len -= op->yes; 481 } 482 return len == 0 ? 0 : -EINVAL; 483} 484 485static int inet_csk_diag_dump(struct sock *sk, 486 struct sk_buff *skb, 487 struct netlink_callback *cb) 488{ 489 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 490 491 if (nlmsg_attrlen(cb->nlh, sizeof(*r))) { 492 struct inet_diag_entry entry; 493 const struct nlattr *bc = nlmsg_find_attr(cb->nlh, 494 sizeof(*r), 495 INET_DIAG_REQ_BYTECODE); 496 struct inet_sock *inet = inet_sk(sk); 497 498 entry.family = sk->sk_family; 499#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 500 if (entry.family == AF_INET6) { 501 struct ipv6_pinfo *np = inet6_sk(sk); 502 503 entry.saddr = np->rcv_saddr.s6_addr32; 504 entry.daddr = np->daddr.s6_addr32; 505 } else 506#endif 507 { 508 entry.saddr = &inet->inet_rcv_saddr; 509 entry.daddr = &inet->inet_daddr; 510 } 511 entry.sport = inet->inet_num; 512 entry.dport = ntohs(inet->inet_dport); 513 entry.userlocks = sk->sk_userlocks; 514 515 if (!inet_diag_bc_run(nla_data(bc), nla_len(bc), &entry)) 516 return 0; 517 } 518 519 return inet_csk_diag_fill(sk, skb, r->idiag_ext, 520 NETLINK_CB(cb->skb).pid, 521 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 522} 523 524static int inet_twsk_diag_dump(struct inet_timewait_sock *tw, 525 struct sk_buff *skb, 526 struct netlink_callback *cb) 527{ 528 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 529 530 if (nlmsg_attrlen(cb->nlh, sizeof(*r))) { 531 struct inet_diag_entry entry; 532 const struct nlattr *bc = nlmsg_find_attr(cb->nlh, 533 sizeof(*r), 534 INET_DIAG_REQ_BYTECODE); 535 536 entry.family = tw->tw_family; 537#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 538 if (tw->tw_family == AF_INET6) { 539 struct inet6_timewait_sock *tw6 = 540 inet6_twsk((struct sock *)tw); 541 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32; 542 entry.daddr = tw6->tw_v6_daddr.s6_addr32; 543 } else 544#endif 545 { 546 entry.saddr = &tw->tw_rcv_saddr; 547 entry.daddr = &tw->tw_daddr; 548 } 549 entry.sport = tw->tw_num; 550 entry.dport = ntohs(tw->tw_dport); 551 entry.userlocks = 0; 552 553 if (!inet_diag_bc_run(nla_data(bc), nla_len(bc), &entry)) 554 return 0; 555 } 556 557 return inet_twsk_diag_fill(tw, skb, r->idiag_ext, 558 NETLINK_CB(cb->skb).pid, 559 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 560} 561 562static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk, 563 struct request_sock *req, u32 pid, u32 seq, 564 const struct nlmsghdr *unlh) 565{ 566 const struct inet_request_sock *ireq = inet_rsk(req); 567 struct inet_sock *inet = inet_sk(sk); 568 unsigned char *b = skb_tail_pointer(skb); 569 struct inet_diag_msg *r; 570 struct nlmsghdr *nlh; 571 long tmo; 572 573 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); 574 nlh->nlmsg_flags = NLM_F_MULTI; 575 r = NLMSG_DATA(nlh); 576 577 r->idiag_family = sk->sk_family; 578 r->idiag_state = TCP_SYN_RECV; 579 r->idiag_timer = 1; 580 r->idiag_retrans = req->retrans; 581 582 r->id.idiag_if = sk->sk_bound_dev_if; 583 r->id.idiag_cookie[0] = (u32)(unsigned long)req; 584 r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1); 585 586 tmo = req->expires - jiffies; 587 if (tmo < 0) 588 tmo = 0; 589 590 r->id.idiag_sport = inet->inet_sport; 591 r->id.idiag_dport = ireq->rmt_port; 592 r->id.idiag_src[0] = ireq->loc_addr; 593 r->id.idiag_dst[0] = ireq->rmt_addr; 594 r->idiag_expires = jiffies_to_msecs(tmo); 595 r->idiag_rqueue = 0; 596 r->idiag_wqueue = 0; 597 r->idiag_uid = sock_i_uid(sk); 598 r->idiag_inode = 0; 599#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 600 if (r->idiag_family == AF_INET6) { 601 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, 602 &inet6_rsk(req)->loc_addr); 603 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, 604 &inet6_rsk(req)->rmt_addr); 605 } 606#endif 607 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 608 609 return skb->len; 610 611nlmsg_failure: 612 nlmsg_trim(skb, b); 613 return -1; 614} 615 616static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk, 617 struct netlink_callback *cb) 618{ 619 struct inet_diag_entry entry; 620 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 621 struct inet_connection_sock *icsk = inet_csk(sk); 622 struct listen_sock *lopt; 623 const struct nlattr *bc = NULL; 624 struct inet_sock *inet = inet_sk(sk); 625 int j, s_j; 626 int reqnum, s_reqnum; 627 int err = 0; 628 629 s_j = cb->args[3]; 630 s_reqnum = cb->args[4]; 631 632 if (s_j > 0) 633 s_j--; 634 635 entry.family = sk->sk_family; 636 637 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 638 639 lopt = icsk->icsk_accept_queue.listen_opt; 640 if (!lopt || !lopt->qlen) 641 goto out; 642 643 if (nlmsg_attrlen(cb->nlh, sizeof(*r))) { 644 bc = nlmsg_find_attr(cb->nlh, sizeof(*r), 645 INET_DIAG_REQ_BYTECODE); 646 entry.sport = inet->inet_num; 647 entry.userlocks = sk->sk_userlocks; 648 } 649 650 for (j = s_j; j < lopt->nr_table_entries; j++) { 651 struct request_sock *req, *head = lopt->syn_table[j]; 652 653 reqnum = 0; 654 for (req = head; req; reqnum++, req = req->dl_next) { 655 struct inet_request_sock *ireq = inet_rsk(req); 656 657 if (reqnum < s_reqnum) 658 continue; 659 if (r->id.idiag_dport != ireq->rmt_port && 660 r->id.idiag_dport) 661 continue; 662 663 if (bc) { 664 entry.saddr = 665#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 666 (entry.family == AF_INET6) ? 667 inet6_rsk(req)->loc_addr.s6_addr32 : 668#endif 669 &ireq->loc_addr; 670 entry.daddr = 671#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 672 (entry.family == AF_INET6) ? 673 inet6_rsk(req)->rmt_addr.s6_addr32 : 674#endif 675 &ireq->rmt_addr; 676 entry.dport = ntohs(ireq->rmt_port); 677 678 if (!inet_diag_bc_run(nla_data(bc), 679 nla_len(bc), &entry)) 680 continue; 681 } 682 683 err = inet_diag_fill_req(skb, sk, req, 684 NETLINK_CB(cb->skb).pid, 685 cb->nlh->nlmsg_seq, cb->nlh); 686 if (err < 0) { 687 cb->args[3] = j + 1; 688 cb->args[4] = reqnum; 689 goto out; 690 } 691 } 692 693 s_reqnum = 0; 694 } 695 696out: 697 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 698 699 return err; 700} 701 702static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) 703{ 704 int i, num; 705 int s_i, s_num; 706 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 707 const struct inet_diag_handler *handler; 708 struct inet_hashinfo *hashinfo; 709 710 handler = inet_diag_lock_handler(cb->nlh->nlmsg_type); 711 if (IS_ERR(handler)) 712 goto unlock; 713 714 hashinfo = handler->idiag_hashinfo; 715 716 s_i = cb->args[1]; 717 s_num = num = cb->args[2]; 718 719 if (cb->args[0] == 0) { 720 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV))) 721 goto skip_listen_ht; 722 723 for (i = s_i; i < INET_LHTABLE_SIZE; i++) { 724 struct sock *sk; 725 struct hlist_nulls_node *node; 726 struct inet_listen_hashbucket *ilb; 727 728 num = 0; 729 ilb = &hashinfo->listening_hash[i]; 730 spin_lock_bh(&ilb->lock); 731 sk_nulls_for_each(sk, node, &ilb->head) { 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->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 spin_unlock_bh(&ilb->lock); 750 goto done; 751 } 752 753syn_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 spin_unlock_bh(&ilb->lock); 759 goto done; 760 } 761 762next_listen: 763 cb->args[3] = 0; 764 cb->args[4] = 0; 765 ++num; 766 } 767 spin_unlock_bh(&ilb->lock); 768 769 s_num = 0; 770 cb->args[3] = 0; 771 cb->args[4] = 0; 772 } 773skip_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_mask; i++) { 782 struct inet_ehash_bucket *head = &hashinfo->ehash[i]; 783 spinlock_t *lock = inet_ehash_lockp(hashinfo, i); 784 struct sock *sk; 785 struct hlist_nulls_node *node; 786 787 num = 0; 788 789 if (hlist_nulls_empty(&head->chain) && 790 hlist_nulls_empty(&head->twchain)) 791 continue; 792 793 if (i > s_i) 794 s_num = 0; 795 796 spin_lock_bh(lock); 797 sk_nulls_for_each(sk, node, &head->chain) { 798 struct inet_sock *inet = inet_sk(sk); 799 800 if (num < s_num) 801 goto next_normal; 802 if (!(r->idiag_states & (1 << sk->sk_state))) 803 goto next_normal; 804 if (r->id.idiag_sport != inet->inet_sport && 805 r->id.idiag_sport) 806 goto next_normal; 807 if (r->id.idiag_dport != inet->inet_dport && 808 r->id.idiag_dport) 809 goto next_normal; 810 if (inet_csk_diag_dump(sk, skb, cb) < 0) { 811 spin_unlock_bh(lock); 812 goto done; 813 } 814next_normal: 815 ++num; 816 } 817 818 if (r->idiag_states & TCPF_TIME_WAIT) { 819 struct inet_timewait_sock *tw; 820 821 inet_twsk_for_each(tw, node, 822 &head->twchain) { 823 824 if (num < s_num) 825 goto next_dying; 826 if (r->id.idiag_sport != tw->tw_sport && 827 r->id.idiag_sport) 828 goto next_dying; 829 if (r->id.idiag_dport != tw->tw_dport && 830 r->id.idiag_dport) 831 goto next_dying; 832 if (inet_twsk_diag_dump(tw, skb, cb) < 0) { 833 spin_unlock_bh(lock); 834 goto done; 835 } 836next_dying: 837 ++num; 838 } 839 } 840 spin_unlock_bh(lock); 841 } 842 843done: 844 cb->args[1] = i; 845 cb->args[2] = num; 846unlock: 847 inet_diag_unlock_handler(handler); 848 return skb->len; 849} 850 851static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 852{ 853 int hdrlen = sizeof(struct inet_diag_req); 854 855 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX || 856 nlmsg_len(nlh) < hdrlen) 857 return -EINVAL; 858 859 if (nlh->nlmsg_flags & NLM_F_DUMP) { 860 if (nlmsg_attrlen(nlh, hdrlen)) { 861 struct nlattr *attr; 862 863 attr = nlmsg_find_attr(nlh, hdrlen, 864 INET_DIAG_REQ_BYTECODE); 865 if (attr == NULL || 866 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 867 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 868 return -EINVAL; 869 } 870 871 return netlink_dump_start(idiagnl, skb, nlh, 872 inet_diag_dump, NULL); 873 } 874 875 return inet_diag_get_exact(skb, nlh); 876} 877 878static DEFINE_MUTEX(inet_diag_mutex); 879 880static void inet_diag_rcv(struct sk_buff *skb) 881{ 882 mutex_lock(&inet_diag_mutex); 883 netlink_rcv_skb(skb, &inet_diag_rcv_msg); 884 mutex_unlock(&inet_diag_mutex); 885} 886 887int inet_diag_register(const struct inet_diag_handler *h) 888{ 889 const __u16 type = h->idiag_type; 890 int err = -EINVAL; 891 892 if (type >= INET_DIAG_GETSOCK_MAX) 893 goto out; 894 895 mutex_lock(&inet_diag_table_mutex); 896 err = -EEXIST; 897 if (inet_diag_table[type] == NULL) { 898 inet_diag_table[type] = h; 899 err = 0; 900 } 901 mutex_unlock(&inet_diag_table_mutex); 902out: 903 return err; 904} 905EXPORT_SYMBOL_GPL(inet_diag_register); 906 907void inet_diag_unregister(const struct inet_diag_handler *h) 908{ 909 const __u16 type = h->idiag_type; 910 911 if (type >= INET_DIAG_GETSOCK_MAX) 912 return; 913 914 mutex_lock(&inet_diag_table_mutex); 915 inet_diag_table[type] = NULL; 916 mutex_unlock(&inet_diag_table_mutex); 917} 918EXPORT_SYMBOL_GPL(inet_diag_unregister); 919 920static int __init inet_diag_init(void) 921{ 922 const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX * 923 sizeof(struct inet_diag_handler *)); 924 int err = -ENOMEM; 925 926 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL); 927 if (!inet_diag_table) 928 goto out; 929 930 idiagnl = netlink_kernel_create(&init_net, NETLINK_INET_DIAG, 0, 931 inet_diag_rcv, NULL, THIS_MODULE); 932 if (idiagnl == NULL) 933 goto out_free_table; 934 err = 0; 935out: 936 return err; 937out_free_table: 938 kfree(inet_diag_table); 939 goto out; 940} 941 942static void __exit inet_diag_exit(void) 943{ 944 netlink_kernel_release(idiagnl); 945 kfree(inet_diag_table); 946} 947 948module_init(inet_diag_init); 949module_exit(inet_diag_exit); 950MODULE_LICENSE("GPL"); 951MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_INET_DIAG); 952