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/cache.h> 18 #include <linux/init.h> 19 #include <linux/time.h> 20 21 #include <net/icmp.h> 22 #include <net/tcp.h> 23 #include <net/ipv6.h> 24 #include <net/inet_common.h> 25 #include <net/inet_connection_sock.h> 26 #include <net/inet_hashtables.h> 27 #include <net/inet_timewait_sock.h> 28 #include <net/inet6_hashtables.h> 29 #include <net/netlink.h> 30 31 #include <linux/inet.h> 32 #include <linux/stddef.h> 33 34 #include <linux/inet_diag.h> 35 36 static const struct inet_diag_handler **inet_diag_table; 37 38 struct inet_diag_entry { 39 __be32 *saddr; 40 __be32 *daddr; 41 u16 sport; 42 u16 dport; 43 u16 family; 44 u16 userlocks; 45 }; 46 47 static struct sock *idiagnl; 48 49 #define INET_DIAG_PUT(skb, attrtype, attrlen) \ 50 RTA_DATA(__RTA_PUT(skb, attrtype, attrlen)) 51 52 static DEFINE_MUTEX(inet_diag_table_mutex); 53 54 static const struct inet_diag_handler *inet_diag_lock_handler(int type) 55 { 56 if (!inet_diag_table[type]) 57 request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK, 58 NETLINK_INET_DIAG, type); 59 60 mutex_lock(&inet_diag_table_mutex); 61 if (!inet_diag_table[type]) 62 return ERR_PTR(-ENOENT); 63 64 return inet_diag_table[type]; 65 } 66 67 static inline void inet_diag_unlock_handler( 68 const struct inet_diag_handler *handler) 69 { 70 mutex_unlock(&inet_diag_table_mutex); 71 } 72 73 static int inet_csk_diag_fill(struct sock *sk, 74 struct sk_buff *skb, 75 int ext, u32 pid, u32 seq, u16 nlmsg_flags, 76 const struct nlmsghdr *unlh) 77 { 78 const struct inet_sock *inet = inet_sk(sk); 79 const struct inet_connection_sock *icsk = inet_csk(sk); 80 struct inet_diag_msg *r; 81 struct nlmsghdr *nlh; 82 void *info = NULL; 83 struct inet_diag_meminfo *minfo = NULL; 84 unsigned char *b = skb_tail_pointer(skb); 85 const struct inet_diag_handler *handler; 86 87 handler = inet_diag_table[unlh->nlmsg_type]; 88 BUG_ON(handler == NULL); 89 90 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); 91 nlh->nlmsg_flags = nlmsg_flags; 92 93 r = NLMSG_DATA(nlh); 94 BUG_ON(sk->sk_state == TCP_TIME_WAIT); 95 96 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) 97 minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo)); 98 99 if (ext & (1 << (INET_DIAG_INFO - 1))) 100 info = INET_DIAG_PUT(skb, INET_DIAG_INFO, 101 handler->idiag_info_size); 102 103 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) { 104 const size_t len = strlen(icsk->icsk_ca_ops->name); 105 106 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1), 107 icsk->icsk_ca_ops->name); 108 } 109 110 r->idiag_family = sk->sk_family; 111 r->idiag_state = sk->sk_state; 112 r->idiag_timer = 0; 113 r->idiag_retrans = 0; 114 115 r->id.idiag_if = sk->sk_bound_dev_if; 116 r->id.idiag_cookie[0] = (u32)(unsigned long)sk; 117 r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1); 118 119 r->id.idiag_sport = inet->inet_sport; 120 r->id.idiag_dport = inet->inet_dport; 121 r->id.idiag_src[0] = inet->inet_rcv_saddr; 122 r->id.idiag_dst[0] = inet->inet_daddr; 123 124 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 125 if (r->idiag_family == AF_INET6) { 126 struct ipv6_pinfo *np = inet6_sk(sk); 127 128 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, 129 &np->rcv_saddr); 130 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, 131 &np->daddr); 132 } 133 #endif 134 135 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ) 136 137 if (icsk->icsk_pending == ICSK_TIME_RETRANS) { 138 r->idiag_timer = 1; 139 r->idiag_retrans = icsk->icsk_retransmits; 140 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 141 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { 142 r->idiag_timer = 4; 143 r->idiag_retrans = icsk->icsk_probes_out; 144 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 145 } else if (timer_pending(&sk->sk_timer)) { 146 r->idiag_timer = 2; 147 r->idiag_retrans = icsk->icsk_probes_out; 148 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires); 149 } else { 150 r->idiag_timer = 0; 151 r->idiag_expires = 0; 152 } 153 #undef EXPIRES_IN_MS 154 155 r->idiag_uid = sock_i_uid(sk); 156 r->idiag_inode = sock_i_ino(sk); 157 158 if (minfo) { 159 minfo->idiag_rmem = sk_rmem_alloc_get(sk); 160 minfo->idiag_wmem = sk->sk_wmem_queued; 161 minfo->idiag_fmem = sk->sk_forward_alloc; 162 minfo->idiag_tmem = sk_wmem_alloc_get(sk); 163 } 164 165 handler->idiag_get_info(sk, r, info); 166 167 if (sk->sk_state < TCP_TIME_WAIT && 168 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info) 169 icsk->icsk_ca_ops->get_info(sk, ext, skb); 170 171 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 172 return skb->len; 173 174 rtattr_failure: 175 nlmsg_failure: 176 nlmsg_trim(skb, b); 177 return -EMSGSIZE; 178 } 179 180 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw, 181 struct sk_buff *skb, int ext, u32 pid, 182 u32 seq, u16 nlmsg_flags, 183 const struct nlmsghdr *unlh) 184 { 185 long tmo; 186 struct inet_diag_msg *r; 187 const unsigned char *previous_tail = skb_tail_pointer(skb); 188 struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq, 189 unlh->nlmsg_type, sizeof(*r)); 190 191 r = NLMSG_DATA(nlh); 192 BUG_ON(tw->tw_state != TCP_TIME_WAIT); 193 194 nlh->nlmsg_flags = nlmsg_flags; 195 196 tmo = tw->tw_ttd - jiffies; 197 if (tmo < 0) 198 tmo = 0; 199 200 r->idiag_family = tw->tw_family; 201 r->idiag_retrans = 0; 202 r->id.idiag_if = tw->tw_bound_dev_if; 203 r->id.idiag_cookie[0] = (u32)(unsigned long)tw; 204 r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1); 205 r->id.idiag_sport = tw->tw_sport; 206 r->id.idiag_dport = tw->tw_dport; 207 r->id.idiag_src[0] = tw->tw_rcv_saddr; 208 r->id.idiag_dst[0] = tw->tw_daddr; 209 r->idiag_state = tw->tw_substate; 210 r->idiag_timer = 3; 211 r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ); 212 r->idiag_rqueue = 0; 213 r->idiag_wqueue = 0; 214 r->idiag_uid = 0; 215 r->idiag_inode = 0; 216 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 217 if (tw->tw_family == AF_INET6) { 218 const struct inet6_timewait_sock *tw6 = 219 inet6_twsk((struct sock *)tw); 220 221 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, 222 &tw6->tw_v6_rcv_saddr); 223 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, 224 &tw6->tw_v6_daddr); 225 } 226 #endif 227 nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail; 228 return skb->len; 229 nlmsg_failure: 230 nlmsg_trim(skb, previous_tail); 231 return -EMSGSIZE; 232 } 233 234 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, 235 int ext, u32 pid, u32 seq, u16 nlmsg_flags, 236 const struct nlmsghdr *unlh) 237 { 238 if (sk->sk_state == TCP_TIME_WAIT) 239 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk, 240 skb, ext, pid, seq, nlmsg_flags, 241 unlh); 242 return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh); 243 } 244 245 static int inet_diag_get_exact(struct sk_buff *in_skb, 246 const struct nlmsghdr *nlh) 247 { 248 int err; 249 struct sock *sk; 250 struct inet_diag_req *req = NLMSG_DATA(nlh); 251 struct sk_buff *rep; 252 struct inet_hashinfo *hashinfo; 253 const struct inet_diag_handler *handler; 254 255 handler = inet_diag_lock_handler(nlh->nlmsg_type); 256 if (IS_ERR(handler)) { 257 err = PTR_ERR(handler); 258 goto unlock; 259 } 260 261 hashinfo = handler->idiag_hashinfo; 262 err = -EINVAL; 263 264 if (req->idiag_family == AF_INET) { 265 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0], 266 req->id.idiag_dport, req->id.idiag_src[0], 267 req->id.idiag_sport, req->id.idiag_if); 268 } 269 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 270 else if (req->idiag_family == AF_INET6) { 271 sk = inet6_lookup(&init_net, hashinfo, 272 (struct in6_addr *)req->id.idiag_dst, 273 req->id.idiag_dport, 274 (struct in6_addr *)req->id.idiag_src, 275 req->id.idiag_sport, 276 req->id.idiag_if); 277 } 278 #endif 279 else { 280 goto unlock; 281 } 282 283 err = -ENOENT; 284 if (sk == NULL) 285 goto unlock; 286 287 err = -ESTALE; 288 if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE || 289 req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) && 290 ((u32)(unsigned long)sk != req->id.idiag_cookie[0] || 291 (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1])) 292 goto out; 293 294 err = -ENOMEM; 295 rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) + 296 sizeof(struct inet_diag_meminfo) + 297 handler->idiag_info_size + 64)), 298 GFP_KERNEL); 299 if (!rep) 300 goto out; 301 302 err = sk_diag_fill(sk, rep, req->idiag_ext, 303 NETLINK_CB(in_skb).pid, 304 nlh->nlmsg_seq, 0, nlh); 305 if (err < 0) { 306 WARN_ON(err == -EMSGSIZE); 307 kfree_skb(rep); 308 goto out; 309 } 310 err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid, 311 MSG_DONTWAIT); 312 if (err > 0) 313 err = 0; 314 315 out: 316 if (sk) { 317 if (sk->sk_state == TCP_TIME_WAIT) 318 inet_twsk_put((struct inet_timewait_sock *)sk); 319 else 320 sock_put(sk); 321 } 322 unlock: 323 inet_diag_unlock_handler(handler); 324 return err; 325 } 326 327 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits) 328 { 329 int words = bits >> 5; 330 331 bits &= 0x1f; 332 333 if (words) { 334 if (memcmp(a1, a2, words << 2)) 335 return 0; 336 } 337 if (bits) { 338 __be32 w1, w2; 339 __be32 mask; 340 341 w1 = a1[words]; 342 w2 = a2[words]; 343 344 mask = htonl((0xffffffff) << (32 - bits)); 345 346 if ((w1 ^ w2) & mask) 347 return 0; 348 } 349 350 return 1; 351 } 352 353 354 static int inet_diag_bc_run(const void *bc, int len, 355 const struct inet_diag_entry *entry) 356 { 357 while (len > 0) { 358 int yes = 1; 359 const struct inet_diag_bc_op *op = bc; 360 361 switch (op->code) { 362 case INET_DIAG_BC_NOP: 363 break; 364 case INET_DIAG_BC_JMP: 365 yes = 0; 366 break; 367 case INET_DIAG_BC_S_GE: 368 yes = entry->sport >= op[1].no; 369 break; 370 case INET_DIAG_BC_S_LE: 371 yes = entry->sport <= op[1].no; 372 break; 373 case INET_DIAG_BC_D_GE: 374 yes = entry->dport >= op[1].no; 375 break; 376 case INET_DIAG_BC_D_LE: 377 yes = entry->dport <= op[1].no; 378 break; 379 case INET_DIAG_BC_AUTO: 380 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); 381 break; 382 case INET_DIAG_BC_S_COND: 383 case INET_DIAG_BC_D_COND: { 384 struct inet_diag_hostcond *cond; 385 __be32 *addr; 386 387 cond = (struct inet_diag_hostcond *)(op + 1); 388 if (cond->port != -1 && 389 cond->port != (op->code == INET_DIAG_BC_S_COND ? 390 entry->sport : entry->dport)) { 391 yes = 0; 392 break; 393 } 394 395 if (cond->prefix_len == 0) 396 break; 397 398 if (op->code == INET_DIAG_BC_S_COND) 399 addr = entry->saddr; 400 else 401 addr = entry->daddr; 402 403 if (bitstring_match(addr, cond->addr, 404 cond->prefix_len)) 405 break; 406 if (entry->family == AF_INET6 && 407 cond->family == AF_INET) { 408 if (addr[0] == 0 && addr[1] == 0 && 409 addr[2] == htonl(0xffff) && 410 bitstring_match(addr + 3, cond->addr, 411 cond->prefix_len)) 412 break; 413 } 414 yes = 0; 415 break; 416 } 417 } 418 419 if (yes) { 420 len -= op->yes; 421 bc += op->yes; 422 } else { 423 len -= op->no; 424 bc += op->no; 425 } 426 } 427 return (len == 0); 428 } 429 430 static int valid_cc(const void *bc, int len, int cc) 431 { 432 while (len >= 0) { 433 const struct inet_diag_bc_op *op = bc; 434 435 if (cc > len) 436 return 0; 437 if (cc == len) 438 return 1; 439 if (op->yes < 4) 440 return 0; 441 len -= op->yes; 442 bc += op->yes; 443 } 444 return 0; 445 } 446 447 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len) 448 { 449 const unsigned char *bc = bytecode; 450 int len = bytecode_len; 451 452 while (len > 0) { 453 struct inet_diag_bc_op *op = (struct inet_diag_bc_op *)bc; 454 455 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len); 456 switch (op->code) { 457 case INET_DIAG_BC_AUTO: 458 case INET_DIAG_BC_S_COND: 459 case INET_DIAG_BC_D_COND: 460 case INET_DIAG_BC_S_GE: 461 case INET_DIAG_BC_S_LE: 462 case INET_DIAG_BC_D_GE: 463 case INET_DIAG_BC_D_LE: 464 if (op->yes < 4 || op->yes > len + 4) 465 return -EINVAL; 466 case INET_DIAG_BC_JMP: 467 if (op->no < 4 || op->no > len + 4) 468 return -EINVAL; 469 if (op->no < len && 470 !valid_cc(bytecode, bytecode_len, len - op->no)) 471 return -EINVAL; 472 break; 473 case INET_DIAG_BC_NOP: 474 if (op->yes < 4 || op->yes > len + 4) 475 return -EINVAL; 476 break; 477 default: 478 return -EINVAL; 479 } 480 bc += op->yes; 481 len -= op->yes; 482 } 483 return len == 0 ? 0 : -EINVAL; 484 } 485 486 static int inet_csk_diag_dump(struct sock *sk, 487 struct sk_buff *skb, 488 struct netlink_callback *cb) 489 { 490 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 491 492 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { 493 struct inet_diag_entry entry; 494 struct rtattr *bc = (struct rtattr *)(r + 1); 495 struct inet_sock *inet = inet_sk(sk); 496 497 entry.family = sk->sk_family; 498 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 499 if (entry.family == AF_INET6) { 500 struct ipv6_pinfo *np = inet6_sk(sk); 501 502 entry.saddr = np->rcv_saddr.s6_addr32; 503 entry.daddr = np->daddr.s6_addr32; 504 } else 505 #endif 506 { 507 entry.saddr = &inet->inet_rcv_saddr; 508 entry.daddr = &inet->inet_daddr; 509 } 510 entry.sport = inet->inet_num; 511 entry.dport = ntohs(inet->inet_dport); 512 entry.userlocks = sk->sk_userlocks; 513 514 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry)) 515 return 0; 516 } 517 518 return inet_csk_diag_fill(sk, skb, r->idiag_ext, 519 NETLINK_CB(cb->skb).pid, 520 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 521 } 522 523 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw, 524 struct sk_buff *skb, 525 struct netlink_callback *cb) 526 { 527 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 528 529 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { 530 struct inet_diag_entry entry; 531 struct rtattr *bc = (struct rtattr *)(r + 1); 532 533 entry.family = tw->tw_family; 534 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 535 if (tw->tw_family == AF_INET6) { 536 struct inet6_timewait_sock *tw6 = 537 inet6_twsk((struct sock *)tw); 538 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32; 539 entry.daddr = tw6->tw_v6_daddr.s6_addr32; 540 } else 541 #endif 542 { 543 entry.saddr = &tw->tw_rcv_saddr; 544 entry.daddr = &tw->tw_daddr; 545 } 546 entry.sport = tw->tw_num; 547 entry.dport = ntohs(tw->tw_dport); 548 entry.userlocks = 0; 549 550 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry)) 551 return 0; 552 } 553 554 return inet_twsk_diag_fill(tw, skb, r->idiag_ext, 555 NETLINK_CB(cb->skb).pid, 556 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 557 } 558 559 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk, 560 struct request_sock *req, u32 pid, u32 seq, 561 const struct nlmsghdr *unlh) 562 { 563 const struct inet_request_sock *ireq = inet_rsk(req); 564 struct inet_sock *inet = inet_sk(sk); 565 unsigned char *b = skb_tail_pointer(skb); 566 struct inet_diag_msg *r; 567 struct nlmsghdr *nlh; 568 long tmo; 569 570 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); 571 nlh->nlmsg_flags = NLM_F_MULTI; 572 r = NLMSG_DATA(nlh); 573 574 r->idiag_family = sk->sk_family; 575 r->idiag_state = TCP_SYN_RECV; 576 r->idiag_timer = 1; 577 r->idiag_retrans = req->retrans; 578 579 r->id.idiag_if = sk->sk_bound_dev_if; 580 r->id.idiag_cookie[0] = (u32)(unsigned long)req; 581 r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1); 582 583 tmo = req->expires - jiffies; 584 if (tmo < 0) 585 tmo = 0; 586 587 r->id.idiag_sport = inet->inet_sport; 588 r->id.idiag_dport = ireq->rmt_port; 589 r->id.idiag_src[0] = ireq->loc_addr; 590 r->id.idiag_dst[0] = ireq->rmt_addr; 591 r->idiag_expires = jiffies_to_msecs(tmo); 592 r->idiag_rqueue = 0; 593 r->idiag_wqueue = 0; 594 r->idiag_uid = sock_i_uid(sk); 595 r->idiag_inode = 0; 596 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 597 if (r->idiag_family == AF_INET6) { 598 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, 599 &inet6_rsk(req)->loc_addr); 600 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, 601 &inet6_rsk(req)->rmt_addr); 602 } 603 #endif 604 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 605 606 return skb->len; 607 608 nlmsg_failure: 609 nlmsg_trim(skb, b); 610 return -1; 611 } 612 613 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk, 614 struct netlink_callback *cb) 615 { 616 struct inet_diag_entry entry; 617 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 618 struct inet_connection_sock *icsk = inet_csk(sk); 619 struct listen_sock *lopt; 620 struct rtattr *bc = NULL; 621 struct inet_sock *inet = inet_sk(sk); 622 int j, s_j; 623 int reqnum, s_reqnum; 624 int err = 0; 625 626 s_j = cb->args[3]; 627 s_reqnum = cb->args[4]; 628 629 if (s_j > 0) 630 s_j--; 631 632 entry.family = sk->sk_family; 633 634 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 635 636 lopt = icsk->icsk_accept_queue.listen_opt; 637 if (!lopt || !lopt->qlen) 638 goto out; 639 640 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { 641 bc = (struct rtattr *)(r + 1); 642 entry.sport = inet->inet_num; 643 entry.userlocks = sk->sk_userlocks; 644 } 645 646 for (j = s_j; j < lopt->nr_table_entries; j++) { 647 struct request_sock *req, *head = lopt->syn_table[j]; 648 649 reqnum = 0; 650 for (req = head; req; reqnum++, req = req->dl_next) { 651 struct inet_request_sock *ireq = inet_rsk(req); 652 653 if (reqnum < s_reqnum) 654 continue; 655 if (r->id.idiag_dport != ireq->rmt_port && 656 r->id.idiag_dport) 657 continue; 658 659 if (bc) { 660 entry.saddr = 661 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 662 (entry.family == AF_INET6) ? 663 inet6_rsk(req)->loc_addr.s6_addr32 : 664 #endif 665 &ireq->loc_addr; 666 entry.daddr = 667 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 668 (entry.family == AF_INET6) ? 669 inet6_rsk(req)->rmt_addr.s6_addr32 : 670 #endif 671 &ireq->rmt_addr; 672 entry.dport = ntohs(ireq->rmt_port); 673 674 if (!inet_diag_bc_run(RTA_DATA(bc), 675 RTA_PAYLOAD(bc), &entry)) 676 continue; 677 } 678 679 err = inet_diag_fill_req(skb, sk, req, 680 NETLINK_CB(cb->skb).pid, 681 cb->nlh->nlmsg_seq, cb->nlh); 682 if (err < 0) { 683 cb->args[3] = j + 1; 684 cb->args[4] = reqnum; 685 goto out; 686 } 687 } 688 689 s_reqnum = 0; 690 } 691 692 out: 693 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 694 695 return err; 696 } 697 698 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) 699 { 700 int i, num; 701 int s_i, s_num; 702 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 703 const struct inet_diag_handler *handler; 704 struct inet_hashinfo *hashinfo; 705 706 handler = inet_diag_lock_handler(cb->nlh->nlmsg_type); 707 if (IS_ERR(handler)) 708 goto unlock; 709 710 hashinfo = handler->idiag_hashinfo; 711 712 s_i = cb->args[1]; 713 s_num = num = cb->args[2]; 714 715 if (cb->args[0] == 0) { 716 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV))) 717 goto skip_listen_ht; 718 719 for (i = s_i; i < INET_LHTABLE_SIZE; i++) { 720 struct sock *sk; 721 struct hlist_nulls_node *node; 722 struct inet_listen_hashbucket *ilb; 723 724 num = 0; 725 ilb = &hashinfo->listening_hash[i]; 726 spin_lock_bh(&ilb->lock); 727 sk_nulls_for_each(sk, node, &ilb->head) { 728 struct inet_sock *inet = inet_sk(sk); 729 730 if (num < s_num) { 731 num++; 732 continue; 733 } 734 735 if (r->id.idiag_sport != inet->inet_sport && 736 r->id.idiag_sport) 737 goto next_listen; 738 739 if (!(r->idiag_states & TCPF_LISTEN) || 740 r->id.idiag_dport || 741 cb->args[3] > 0) 742 goto syn_recv; 743 744 if (inet_csk_diag_dump(sk, skb, cb) < 0) { 745 spin_unlock_bh(&ilb->lock); 746 goto done; 747 } 748 749 syn_recv: 750 if (!(r->idiag_states & TCPF_SYN_RECV)) 751 goto next_listen; 752 753 if (inet_diag_dump_reqs(skb, sk, cb) < 0) { 754 spin_unlock_bh(&ilb->lock); 755 goto done; 756 } 757 758 next_listen: 759 cb->args[3] = 0; 760 cb->args[4] = 0; 761 ++num; 762 } 763 spin_unlock_bh(&ilb->lock); 764 765 s_num = 0; 766 cb->args[3] = 0; 767 cb->args[4] = 0; 768 } 769 skip_listen_ht: 770 cb->args[0] = 1; 771 s_i = num = s_num = 0; 772 } 773 774 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV))) 775 goto unlock; 776 777 for (i = s_i; i <= hashinfo->ehash_mask; i++) { 778 struct inet_ehash_bucket *head = &hashinfo->ehash[i]; 779 spinlock_t *lock = inet_ehash_lockp(hashinfo, i); 780 struct sock *sk; 781 struct hlist_nulls_node *node; 782 783 num = 0; 784 785 if (hlist_nulls_empty(&head->chain) && 786 hlist_nulls_empty(&head->twchain)) 787 continue; 788 789 if (i > s_i) 790 s_num = 0; 791 792 spin_lock_bh(lock); 793 sk_nulls_for_each(sk, node, &head->chain) { 794 struct inet_sock *inet = inet_sk(sk); 795 796 if (num < s_num) 797 goto next_normal; 798 if (!(r->idiag_states & (1 << sk->sk_state))) 799 goto next_normal; 800 if (r->id.idiag_sport != inet->inet_sport && 801 r->id.idiag_sport) 802 goto next_normal; 803 if (r->id.idiag_dport != inet->inet_dport && 804 r->id.idiag_dport) 805 goto next_normal; 806 if (inet_csk_diag_dump(sk, skb, cb) < 0) { 807 spin_unlock_bh(lock); 808 goto done; 809 } 810 next_normal: 811 ++num; 812 } 813 814 if (r->idiag_states & TCPF_TIME_WAIT) { 815 struct inet_timewait_sock *tw; 816 817 inet_twsk_for_each(tw, node, 818 &head->twchain) { 819 820 if (num < s_num) 821 goto next_dying; 822 if (r->id.idiag_sport != tw->tw_sport && 823 r->id.idiag_sport) 824 goto next_dying; 825 if (r->id.idiag_dport != tw->tw_dport && 826 r->id.idiag_dport) 827 goto next_dying; 828 if (inet_twsk_diag_dump(tw, skb, cb) < 0) { 829 spin_unlock_bh(lock); 830 goto done; 831 } 832 next_dying: 833 ++num; 834 } 835 } 836 spin_unlock_bh(lock); 837 } 838 839 done: 840 cb->args[1] = i; 841 cb->args[2] = num; 842 unlock: 843 inet_diag_unlock_handler(handler); 844 return skb->len; 845 } 846 847 static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 848 { 849 int hdrlen = sizeof(struct inet_diag_req); 850 851 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX || 852 nlmsg_len(nlh) < hdrlen) 853 return -EINVAL; 854 855 if (nlh->nlmsg_flags & NLM_F_DUMP) { 856 if (nlmsg_attrlen(nlh, hdrlen)) { 857 struct nlattr *attr; 858 859 attr = nlmsg_find_attr(nlh, hdrlen, 860 INET_DIAG_REQ_BYTECODE); 861 if (attr == NULL || 862 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 863 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 864 return -EINVAL; 865 } 866 867 return netlink_dump_start(idiagnl, skb, nlh, 868 inet_diag_dump, NULL); 869 } 870 871 return inet_diag_get_exact(skb, nlh); 872 } 873 874 static DEFINE_MUTEX(inet_diag_mutex); 875 876 static void inet_diag_rcv(struct sk_buff *skb) 877 { 878 mutex_lock(&inet_diag_mutex); 879 netlink_rcv_skb(skb, &inet_diag_rcv_msg); 880 mutex_unlock(&inet_diag_mutex); 881 } 882 883 int inet_diag_register(const struct inet_diag_handler *h) 884 { 885 const __u16 type = h->idiag_type; 886 int err = -EINVAL; 887 888 if (type >= INET_DIAG_GETSOCK_MAX) 889 goto out; 890 891 mutex_lock(&inet_diag_table_mutex); 892 err = -EEXIST; 893 if (inet_diag_table[type] == NULL) { 894 inet_diag_table[type] = h; 895 err = 0; 896 } 897 mutex_unlock(&inet_diag_table_mutex); 898 out: 899 return err; 900 } 901 EXPORT_SYMBOL_GPL(inet_diag_register); 902 903 void inet_diag_unregister(const struct inet_diag_handler *h) 904 { 905 const __u16 type = h->idiag_type; 906 907 if (type >= INET_DIAG_GETSOCK_MAX) 908 return; 909 910 mutex_lock(&inet_diag_table_mutex); 911 inet_diag_table[type] = NULL; 912 mutex_unlock(&inet_diag_table_mutex); 913 } 914 EXPORT_SYMBOL_GPL(inet_diag_unregister); 915 916 static int __init inet_diag_init(void) 917 { 918 const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX * 919 sizeof(struct inet_diag_handler *)); 920 int err = -ENOMEM; 921 922 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL); 923 if (!inet_diag_table) 924 goto out; 925 926 idiagnl = netlink_kernel_create(&init_net, NETLINK_INET_DIAG, 0, 927 inet_diag_rcv, NULL, THIS_MODULE); 928 if (idiagnl == NULL) 929 goto out_free_table; 930 err = 0; 931 out: 932 return err; 933 out_free_table: 934 kfree(inet_diag_table); 935 goto out; 936 } 937 938 static void __exit inet_diag_exit(void) 939 { 940 netlink_kernel_release(idiagnl); 941 kfree(inet_diag_table); 942 } 943 944 module_init(inet_diag_init); 945 module_exit(inet_diag_exit); 946 MODULE_LICENSE("GPL"); 947 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_INET_DIAG); 948