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 37 static const struct inet_diag_handler **inet_diag_table; 38 39 struct inet_diag_entry { 40 __be32 *saddr; 41 __be32 *daddr; 42 u16 sport; 43 u16 dport; 44 u16 family; 45 u16 userlocks; 46 }; 47 48 static struct sock *idiagnl; 49 50 #define INET_DIAG_PUT(skb, attrtype, attrlen) \ 51 RTA_DATA(__RTA_PUT(skb, attrtype, attrlen)) 52 53 static DEFINE_MUTEX(inet_diag_table_mutex); 54 55 static 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 68 static inline void inet_diag_unlock_handler( 69 const struct inet_diag_handler *handler) 70 { 71 mutex_unlock(&inet_diag_table_mutex); 72 } 73 74 static 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 if ((ext & (1 << (INET_DIAG_TOS - 1))) && (sk->sk_family != AF_INET6)) 112 RTA_PUT_U8(skb, INET_DIAG_TOS, inet->tos); 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->inet_sport; 124 r->id.idiag_dport = inet->inet_dport; 125 r->id.idiag_src[0] = inet->inet_rcv_saddr; 126 r->id.idiag_dst[0] = inet->inet_daddr; 127 128 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 129 if (r->idiag_family == AF_INET6) { 130 const struct ipv6_pinfo *np = inet6_sk(sk); 131 132 *(struct in6_addr *)r->id.idiag_src = np->rcv_saddr; 133 *(struct in6_addr *)r->id.idiag_dst = np->daddr; 134 if (ext & (1 << (INET_DIAG_TCLASS - 1))) 135 RTA_PUT_U8(skb, INET_DIAG_TCLASS, np->tclass); 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 = sk_rmem_alloc_get(sk); 164 minfo->idiag_wmem = sk->sk_wmem_queued; 165 minfo->idiag_fmem = sk->sk_forward_alloc; 166 minfo->idiag_tmem = sk_wmem_alloc_get(sk); 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_retrans = 0; 206 r->id.idiag_if = tw->tw_bound_dev_if; 207 r->id.idiag_cookie[0] = (u32)(unsigned long)tw; 208 r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1); 209 r->id.idiag_sport = tw->tw_sport; 210 r->id.idiag_dport = tw->tw_dport; 211 r->id.idiag_src[0] = tw->tw_rcv_saddr; 212 r->id.idiag_dst[0] = tw->tw_daddr; 213 r->idiag_state = tw->tw_substate; 214 r->idiag_timer = 3; 215 r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ); 216 r->idiag_rqueue = 0; 217 r->idiag_wqueue = 0; 218 r->idiag_uid = 0; 219 r->idiag_inode = 0; 220 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 221 if (tw->tw_family == AF_INET6) { 222 const struct inet6_timewait_sock *tw6 = 223 inet6_twsk((struct sock *)tw); 224 225 *(struct in6_addr *)r->id.idiag_src = tw6->tw_v6_rcv_saddr; 226 *(struct in6_addr *)r->id.idiag_dst = tw6->tw_v6_daddr; 227 } 228 #endif 229 nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail; 230 return skb->len; 231 nlmsg_failure: 232 nlmsg_trim(skb, previous_tail); 233 return -EMSGSIZE; 234 } 235 236 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, 237 int ext, u32 pid, u32 seq, u16 nlmsg_flags, 238 const struct nlmsghdr *unlh) 239 { 240 if (sk->sk_state == TCP_TIME_WAIT) 241 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk, 242 skb, ext, pid, seq, nlmsg_flags, 243 unlh); 244 return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh); 245 } 246 247 static int inet_diag_get_exact(struct sk_buff *in_skb, 248 const struct nlmsghdr *nlh) 249 { 250 int err; 251 struct sock *sk; 252 struct inet_diag_req *req = NLMSG_DATA(nlh); 253 struct sk_buff *rep; 254 struct inet_hashinfo *hashinfo; 255 const struct inet_diag_handler *handler; 256 257 handler = inet_diag_lock_handler(nlh->nlmsg_type); 258 if (IS_ERR(handler)) { 259 err = PTR_ERR(handler); 260 goto unlock; 261 } 262 263 hashinfo = handler->idiag_hashinfo; 264 err = -EINVAL; 265 266 if (req->idiag_family == AF_INET) { 267 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0], 268 req->id.idiag_dport, req->id.idiag_src[0], 269 req->id.idiag_sport, req->id.idiag_if); 270 } 271 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 272 else if (req->idiag_family == AF_INET6) { 273 sk = inet6_lookup(&init_net, hashinfo, 274 (struct in6_addr *)req->id.idiag_dst, 275 req->id.idiag_dport, 276 (struct in6_addr *)req->id.idiag_src, 277 req->id.idiag_sport, 278 req->id.idiag_if); 279 } 280 #endif 281 else { 282 goto unlock; 283 } 284 285 err = -ENOENT; 286 if (sk == NULL) 287 goto unlock; 288 289 err = -ESTALE; 290 if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE || 291 req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) && 292 ((u32)(unsigned long)sk != req->id.idiag_cookie[0] || 293 (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1])) 294 goto out; 295 296 err = -ENOMEM; 297 rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) + 298 sizeof(struct inet_diag_meminfo) + 299 handler->idiag_info_size + 64)), 300 GFP_KERNEL); 301 if (!rep) 302 goto out; 303 304 err = sk_diag_fill(sk, rep, req->idiag_ext, 305 NETLINK_CB(in_skb).pid, 306 nlh->nlmsg_seq, 0, nlh); 307 if (err < 0) { 308 WARN_ON(err == -EMSGSIZE); 309 kfree_skb(rep); 310 goto out; 311 } 312 err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid, 313 MSG_DONTWAIT); 314 if (err > 0) 315 err = 0; 316 317 out: 318 if (sk) { 319 if (sk->sk_state == TCP_TIME_WAIT) 320 inet_twsk_put((struct inet_timewait_sock *)sk); 321 else 322 sock_put(sk); 323 } 324 unlock: 325 inet_diag_unlock_handler(handler); 326 return err; 327 } 328 329 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits) 330 { 331 int words = bits >> 5; 332 333 bits &= 0x1f; 334 335 if (words) { 336 if (memcmp(a1, a2, words << 2)) 337 return 0; 338 } 339 if (bits) { 340 __be32 w1, w2; 341 __be32 mask; 342 343 w1 = a1[words]; 344 w2 = a2[words]; 345 346 mask = htonl((0xffffffff) << (32 - bits)); 347 348 if ((w1 ^ w2) & mask) 349 return 0; 350 } 351 352 return 1; 353 } 354 355 356 static int inet_diag_bc_run(const void *bc, int len, 357 const struct inet_diag_entry *entry) 358 { 359 while (len > 0) { 360 int yes = 1; 361 const struct inet_diag_bc_op *op = bc; 362 363 switch (op->code) { 364 case INET_DIAG_BC_NOP: 365 break; 366 case INET_DIAG_BC_JMP: 367 yes = 0; 368 break; 369 case INET_DIAG_BC_S_GE: 370 yes = entry->sport >= op[1].no; 371 break; 372 case INET_DIAG_BC_S_LE: 373 yes = entry->sport <= op[1].no; 374 break; 375 case INET_DIAG_BC_D_GE: 376 yes = entry->dport >= op[1].no; 377 break; 378 case INET_DIAG_BC_D_LE: 379 yes = entry->dport <= op[1].no; 380 break; 381 case INET_DIAG_BC_AUTO: 382 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); 383 break; 384 case INET_DIAG_BC_S_COND: 385 case INET_DIAG_BC_D_COND: { 386 struct inet_diag_hostcond *cond; 387 __be32 *addr; 388 389 cond = (struct inet_diag_hostcond *)(op + 1); 390 if (cond->port != -1 && 391 cond->port != (op->code == INET_DIAG_BC_S_COND ? 392 entry->sport : entry->dport)) { 393 yes = 0; 394 break; 395 } 396 397 if (cond->prefix_len == 0) 398 break; 399 400 if (op->code == INET_DIAG_BC_S_COND) 401 addr = entry->saddr; 402 else 403 addr = entry->daddr; 404 405 if (bitstring_match(addr, cond->addr, 406 cond->prefix_len)) 407 break; 408 if (entry->family == AF_INET6 && 409 cond->family == AF_INET) { 410 if (addr[0] == 0 && addr[1] == 0 && 411 addr[2] == htonl(0xffff) && 412 bitstring_match(addr + 3, cond->addr, 413 cond->prefix_len)) 414 break; 415 } 416 yes = 0; 417 break; 418 } 419 } 420 421 if (yes) { 422 len -= op->yes; 423 bc += op->yes; 424 } else { 425 len -= op->no; 426 bc += op->no; 427 } 428 } 429 return len == 0; 430 } 431 432 static int valid_cc(const void *bc, int len, int cc) 433 { 434 while (len >= 0) { 435 const struct inet_diag_bc_op *op = bc; 436 437 if (cc > len) 438 return 0; 439 if (cc == len) 440 return 1; 441 if (op->yes < 4 || op->yes & 3) 442 return 0; 443 len -= op->yes; 444 bc += op->yes; 445 } 446 return 0; 447 } 448 449 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len) 450 { 451 const void *bc = bytecode; 452 int len = bytecode_len; 453 454 while (len > 0) { 455 const struct inet_diag_bc_op *op = bc; 456 457 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len); 458 switch (op->code) { 459 case INET_DIAG_BC_AUTO: 460 case INET_DIAG_BC_S_COND: 461 case INET_DIAG_BC_D_COND: 462 case INET_DIAG_BC_S_GE: 463 case INET_DIAG_BC_S_LE: 464 case INET_DIAG_BC_D_GE: 465 case INET_DIAG_BC_D_LE: 466 case INET_DIAG_BC_JMP: 467 if (op->no < 4 || op->no > len + 4 || op->no & 3) 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 break; 475 default: 476 return -EINVAL; 477 } 478 if (op->yes < 4 || op->yes > len + 4 || op->yes & 3) 479 return -EINVAL; 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 (nlmsg_attrlen(cb->nlh, sizeof(*r))) { 493 struct inet_diag_entry entry; 494 const struct nlattr *bc = nlmsg_find_attr(cb->nlh, 495 sizeof(*r), 496 INET_DIAG_REQ_BYTECODE); 497 struct inet_sock *inet = inet_sk(sk); 498 499 entry.family = sk->sk_family; 500 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 501 if (entry.family == AF_INET6) { 502 struct ipv6_pinfo *np = inet6_sk(sk); 503 504 entry.saddr = np->rcv_saddr.s6_addr32; 505 entry.daddr = np->daddr.s6_addr32; 506 } else 507 #endif 508 { 509 entry.saddr = &inet->inet_rcv_saddr; 510 entry.daddr = &inet->inet_daddr; 511 } 512 entry.sport = inet->inet_num; 513 entry.dport = ntohs(inet->inet_dport); 514 entry.userlocks = sk->sk_userlocks; 515 516 if (!inet_diag_bc_run(nla_data(bc), nla_len(bc), &entry)) 517 return 0; 518 } 519 520 return inet_csk_diag_fill(sk, skb, r->idiag_ext, 521 NETLINK_CB(cb->skb).pid, 522 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 523 } 524 525 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw, 526 struct sk_buff *skb, 527 struct netlink_callback *cb) 528 { 529 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 530 531 if (nlmsg_attrlen(cb->nlh, sizeof(*r))) { 532 struct inet_diag_entry entry; 533 const struct nlattr *bc = nlmsg_find_attr(cb->nlh, 534 sizeof(*r), 535 INET_DIAG_REQ_BYTECODE); 536 537 entry.family = tw->tw_family; 538 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 539 if (tw->tw_family == AF_INET6) { 540 struct inet6_timewait_sock *tw6 = 541 inet6_twsk((struct sock *)tw); 542 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32; 543 entry.daddr = tw6->tw_v6_daddr.s6_addr32; 544 } else 545 #endif 546 { 547 entry.saddr = &tw->tw_rcv_saddr; 548 entry.daddr = &tw->tw_daddr; 549 } 550 entry.sport = tw->tw_num; 551 entry.dport = ntohs(tw->tw_dport); 552 entry.userlocks = 0; 553 554 if (!inet_diag_bc_run(nla_data(bc), nla_len(bc), &entry)) 555 return 0; 556 } 557 558 return inet_twsk_diag_fill(tw, skb, r->idiag_ext, 559 NETLINK_CB(cb->skb).pid, 560 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 561 } 562 563 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk, 564 struct request_sock *req, u32 pid, u32 seq, 565 const struct nlmsghdr *unlh) 566 { 567 const struct inet_request_sock *ireq = inet_rsk(req); 568 struct inet_sock *inet = inet_sk(sk); 569 unsigned char *b = skb_tail_pointer(skb); 570 struct inet_diag_msg *r; 571 struct nlmsghdr *nlh; 572 long tmo; 573 574 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); 575 nlh->nlmsg_flags = NLM_F_MULTI; 576 r = NLMSG_DATA(nlh); 577 578 r->idiag_family = sk->sk_family; 579 r->idiag_state = TCP_SYN_RECV; 580 r->idiag_timer = 1; 581 r->idiag_retrans = req->retrans; 582 583 r->id.idiag_if = sk->sk_bound_dev_if; 584 r->id.idiag_cookie[0] = (u32)(unsigned long)req; 585 r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1); 586 587 tmo = req->expires - jiffies; 588 if (tmo < 0) 589 tmo = 0; 590 591 r->id.idiag_sport = inet->inet_sport; 592 r->id.idiag_dport = ireq->rmt_port; 593 r->id.idiag_src[0] = ireq->loc_addr; 594 r->id.idiag_dst[0] = ireq->rmt_addr; 595 r->idiag_expires = jiffies_to_msecs(tmo); 596 r->idiag_rqueue = 0; 597 r->idiag_wqueue = 0; 598 r->idiag_uid = sock_i_uid(sk); 599 r->idiag_inode = 0; 600 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 601 if (r->idiag_family == AF_INET6) { 602 *(struct in6_addr *)r->id.idiag_src = inet6_rsk(req)->loc_addr; 603 *(struct in6_addr *)r->id.idiag_dst = inet6_rsk(req)->rmt_addr; 604 } 605 #endif 606 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 607 608 return skb->len; 609 610 nlmsg_failure: 611 nlmsg_trim(skb, b); 612 return -1; 613 } 614 615 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk, 616 struct netlink_callback *cb) 617 { 618 struct inet_diag_entry entry; 619 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 620 struct inet_connection_sock *icsk = inet_csk(sk); 621 struct listen_sock *lopt; 622 const struct nlattr *bc = NULL; 623 struct inet_sock *inet = inet_sk(sk); 624 int j, s_j; 625 int reqnum, s_reqnum; 626 int err = 0; 627 628 s_j = cb->args[3]; 629 s_reqnum = cb->args[4]; 630 631 if (s_j > 0) 632 s_j--; 633 634 entry.family = sk->sk_family; 635 636 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 637 638 lopt = icsk->icsk_accept_queue.listen_opt; 639 if (!lopt || !lopt->qlen) 640 goto out; 641 642 if (nlmsg_attrlen(cb->nlh, sizeof(*r))) { 643 bc = nlmsg_find_attr(cb->nlh, sizeof(*r), 644 INET_DIAG_REQ_BYTECODE); 645 entry.sport = inet->inet_num; 646 entry.userlocks = sk->sk_userlocks; 647 } 648 649 for (j = s_j; j < lopt->nr_table_entries; j++) { 650 struct request_sock *req, *head = lopt->syn_table[j]; 651 652 reqnum = 0; 653 for (req = head; req; reqnum++, req = req->dl_next) { 654 struct inet_request_sock *ireq = inet_rsk(req); 655 656 if (reqnum < s_reqnum) 657 continue; 658 if (r->id.idiag_dport != ireq->rmt_port && 659 r->id.idiag_dport) 660 continue; 661 662 if (bc) { 663 entry.saddr = 664 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 665 (entry.family == AF_INET6) ? 666 inet6_rsk(req)->loc_addr.s6_addr32 : 667 #endif 668 &ireq->loc_addr; 669 entry.daddr = 670 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 671 (entry.family == AF_INET6) ? 672 inet6_rsk(req)->rmt_addr.s6_addr32 : 673 #endif 674 &ireq->rmt_addr; 675 entry.dport = ntohs(ireq->rmt_port); 676 677 if (!inet_diag_bc_run(nla_data(bc), 678 nla_len(bc), &entry)) 679 continue; 680 } 681 682 err = inet_diag_fill_req(skb, sk, req, 683 NETLINK_CB(cb->skb).pid, 684 cb->nlh->nlmsg_seq, cb->nlh); 685 if (err < 0) { 686 cb->args[3] = j + 1; 687 cb->args[4] = reqnum; 688 goto out; 689 } 690 } 691 692 s_reqnum = 0; 693 } 694 695 out: 696 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 697 698 return err; 699 } 700 701 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) 702 { 703 int i, num; 704 int s_i, s_num; 705 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 706 const struct inet_diag_handler *handler; 707 struct inet_hashinfo *hashinfo; 708 709 handler = inet_diag_lock_handler(cb->nlh->nlmsg_type); 710 if (IS_ERR(handler)) 711 goto unlock; 712 713 hashinfo = handler->idiag_hashinfo; 714 715 s_i = cb->args[1]; 716 s_num = num = cb->args[2]; 717 718 if (cb->args[0] == 0) { 719 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV))) 720 goto skip_listen_ht; 721 722 for (i = s_i; i < INET_LHTABLE_SIZE; i++) { 723 struct sock *sk; 724 struct hlist_nulls_node *node; 725 struct inet_listen_hashbucket *ilb; 726 727 num = 0; 728 ilb = &hashinfo->listening_hash[i]; 729 spin_lock_bh(&ilb->lock); 730 sk_nulls_for_each(sk, node, &ilb->head) { 731 struct inet_sock *inet = inet_sk(sk); 732 733 if (num < s_num) { 734 num++; 735 continue; 736 } 737 738 if (r->id.idiag_sport != inet->inet_sport && 739 r->id.idiag_sport) 740 goto next_listen; 741 742 if (!(r->idiag_states & TCPF_LISTEN) || 743 r->id.idiag_dport || 744 cb->args[3] > 0) 745 goto syn_recv; 746 747 if (inet_csk_diag_dump(sk, skb, cb) < 0) { 748 spin_unlock_bh(&ilb->lock); 749 goto done; 750 } 751 752 syn_recv: 753 if (!(r->idiag_states & TCPF_SYN_RECV)) 754 goto next_listen; 755 756 if (inet_diag_dump_reqs(skb, sk, cb) < 0) { 757 spin_unlock_bh(&ilb->lock); 758 goto done; 759 } 760 761 next_listen: 762 cb->args[3] = 0; 763 cb->args[4] = 0; 764 ++num; 765 } 766 spin_unlock_bh(&ilb->lock); 767 768 s_num = 0; 769 cb->args[3] = 0; 770 cb->args[4] = 0; 771 } 772 skip_listen_ht: 773 cb->args[0] = 1; 774 s_i = num = s_num = 0; 775 } 776 777 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV))) 778 goto unlock; 779 780 for (i = s_i; i <= hashinfo->ehash_mask; i++) { 781 struct inet_ehash_bucket *head = &hashinfo->ehash[i]; 782 spinlock_t *lock = inet_ehash_lockp(hashinfo, i); 783 struct sock *sk; 784 struct hlist_nulls_node *node; 785 786 num = 0; 787 788 if (hlist_nulls_empty(&head->chain) && 789 hlist_nulls_empty(&head->twchain)) 790 continue; 791 792 if (i > s_i) 793 s_num = 0; 794 795 spin_lock_bh(lock); 796 sk_nulls_for_each(sk, node, &head->chain) { 797 struct inet_sock *inet = inet_sk(sk); 798 799 if (num < s_num) 800 goto next_normal; 801 if (!(r->idiag_states & (1 << sk->sk_state))) 802 goto next_normal; 803 if (r->id.idiag_sport != inet->inet_sport && 804 r->id.idiag_sport) 805 goto next_normal; 806 if (r->id.idiag_dport != inet->inet_dport && 807 r->id.idiag_dport) 808 goto next_normal; 809 if (inet_csk_diag_dump(sk, skb, cb) < 0) { 810 spin_unlock_bh(lock); 811 goto done; 812 } 813 next_normal: 814 ++num; 815 } 816 817 if (r->idiag_states & TCPF_TIME_WAIT) { 818 struct inet_timewait_sock *tw; 819 820 inet_twsk_for_each(tw, node, 821 &head->twchain) { 822 823 if (num < s_num) 824 goto next_dying; 825 if (r->id.idiag_sport != tw->tw_sport && 826 r->id.idiag_sport) 827 goto next_dying; 828 if (r->id.idiag_dport != tw->tw_dport && 829 r->id.idiag_dport) 830 goto next_dying; 831 if (inet_twsk_diag_dump(tw, skb, cb) < 0) { 832 spin_unlock_bh(lock); 833 goto done; 834 } 835 next_dying: 836 ++num; 837 } 838 } 839 spin_unlock_bh(lock); 840 } 841 842 done: 843 cb->args[1] = i; 844 cb->args[2] = num; 845 unlock: 846 inet_diag_unlock_handler(handler); 847 return skb->len; 848 } 849 850 static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 851 { 852 int hdrlen = sizeof(struct inet_diag_req); 853 854 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX || 855 nlmsg_len(nlh) < hdrlen) 856 return -EINVAL; 857 858 if (nlh->nlmsg_flags & NLM_F_DUMP) { 859 if (nlmsg_attrlen(nlh, hdrlen)) { 860 struct nlattr *attr; 861 862 attr = nlmsg_find_attr(nlh, hdrlen, 863 INET_DIAG_REQ_BYTECODE); 864 if (attr == NULL || 865 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 866 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 867 return -EINVAL; 868 } 869 870 return netlink_dump_start(idiagnl, skb, nlh, 871 inet_diag_dump, NULL, 0); 872 } 873 874 return inet_diag_get_exact(skb, nlh); 875 } 876 877 static DEFINE_MUTEX(inet_diag_mutex); 878 879 static void inet_diag_rcv(struct sk_buff *skb) 880 { 881 mutex_lock(&inet_diag_mutex); 882 netlink_rcv_skb(skb, &inet_diag_rcv_msg); 883 mutex_unlock(&inet_diag_mutex); 884 } 885 886 int inet_diag_register(const struct inet_diag_handler *h) 887 { 888 const __u16 type = h->idiag_type; 889 int err = -EINVAL; 890 891 if (type >= INET_DIAG_GETSOCK_MAX) 892 goto out; 893 894 mutex_lock(&inet_diag_table_mutex); 895 err = -EEXIST; 896 if (inet_diag_table[type] == NULL) { 897 inet_diag_table[type] = h; 898 err = 0; 899 } 900 mutex_unlock(&inet_diag_table_mutex); 901 out: 902 return err; 903 } 904 EXPORT_SYMBOL_GPL(inet_diag_register); 905 906 void inet_diag_unregister(const struct inet_diag_handler *h) 907 { 908 const __u16 type = h->idiag_type; 909 910 if (type >= INET_DIAG_GETSOCK_MAX) 911 return; 912 913 mutex_lock(&inet_diag_table_mutex); 914 inet_diag_table[type] = NULL; 915 mutex_unlock(&inet_diag_table_mutex); 916 } 917 EXPORT_SYMBOL_GPL(inet_diag_unregister); 918 919 static int __init inet_diag_init(void) 920 { 921 const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX * 922 sizeof(struct inet_diag_handler *)); 923 int err = -ENOMEM; 924 925 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL); 926 if (!inet_diag_table) 927 goto out; 928 929 idiagnl = netlink_kernel_create(&init_net, NETLINK_INET_DIAG, 0, 930 inet_diag_rcv, NULL, THIS_MODULE); 931 if (idiagnl == NULL) 932 goto out_free_table; 933 err = 0; 934 out: 935 return err; 936 out_free_table: 937 kfree(inet_diag_table); 938 goto out; 939 } 940 941 static void __exit inet_diag_exit(void) 942 { 943 netlink_kernel_release(idiagnl); 944 kfree(inet_diag_table); 945 } 946 947 module_init(inet_diag_init); 948 module_exit(inet_diag_exit); 949 MODULE_LICENSE("GPL"); 950 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_INET_DIAG); 951