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 *sdiagnl; 49 50 #define INET_DIAG_PUT(skb, attrtype, attrlen) \ 51 RTA_DATA(__RTA_PUT(skb, attrtype, attrlen)) 52 53 static inline int inet_diag_type2proto(int type) 54 { 55 switch (type) { 56 case TCPDIAG_GETSOCK: 57 return IPPROTO_TCP; 58 case DCCPDIAG_GETSOCK: 59 return IPPROTO_DCCP; 60 default: 61 return 0; 62 } 63 } 64 65 static DEFINE_MUTEX(inet_diag_table_mutex); 66 67 static const struct inet_diag_handler *inet_diag_lock_handler(int proto) 68 { 69 if (!inet_diag_table[proto]) 70 request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK, 71 NETLINK_SOCK_DIAG, proto); 72 73 mutex_lock(&inet_diag_table_mutex); 74 if (!inet_diag_table[proto]) 75 return ERR_PTR(-ENOENT); 76 77 return inet_diag_table[proto]; 78 } 79 80 static inline void inet_diag_unlock_handler( 81 const struct inet_diag_handler *handler) 82 { 83 mutex_unlock(&inet_diag_table_mutex); 84 } 85 86 static int inet_csk_diag_fill(struct sock *sk, 87 struct sk_buff *skb, 88 int ext, u32 pid, u32 seq, u16 nlmsg_flags, 89 const struct nlmsghdr *unlh) 90 { 91 const struct inet_sock *inet = inet_sk(sk); 92 const struct inet_connection_sock *icsk = inet_csk(sk); 93 struct inet_diag_msg *r; 94 struct nlmsghdr *nlh; 95 void *info = NULL; 96 struct inet_diag_meminfo *minfo = NULL; 97 unsigned char *b = skb_tail_pointer(skb); 98 const struct inet_diag_handler *handler; 99 100 handler = inet_diag_table[inet_diag_type2proto(unlh->nlmsg_type)]; 101 BUG_ON(handler == NULL); 102 103 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); 104 nlh->nlmsg_flags = nlmsg_flags; 105 106 r = NLMSG_DATA(nlh); 107 BUG_ON(sk->sk_state == TCP_TIME_WAIT); 108 109 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) 110 minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo)); 111 112 if (ext & (1 << (INET_DIAG_INFO - 1))) 113 info = INET_DIAG_PUT(skb, INET_DIAG_INFO, 114 handler->idiag_info_size); 115 116 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) { 117 const size_t len = strlen(icsk->icsk_ca_ops->name); 118 119 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1), 120 icsk->icsk_ca_ops->name); 121 } 122 123 r->idiag_family = sk->sk_family; 124 r->idiag_state = sk->sk_state; 125 r->idiag_timer = 0; 126 r->idiag_retrans = 0; 127 128 r->id.idiag_if = sk->sk_bound_dev_if; 129 r->id.idiag_cookie[0] = (u32)(unsigned long)sk; 130 r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1); 131 132 r->id.idiag_sport = inet->inet_sport; 133 r->id.idiag_dport = inet->inet_dport; 134 r->id.idiag_src[0] = inet->inet_rcv_saddr; 135 r->id.idiag_dst[0] = inet->inet_daddr; 136 137 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections, 138 * hence this needs to be included regardless of socket family. 139 */ 140 if (ext & (1 << (INET_DIAG_TOS - 1))) 141 RTA_PUT_U8(skb, INET_DIAG_TOS, inet->tos); 142 143 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 144 if (r->idiag_family == AF_INET6) { 145 const struct ipv6_pinfo *np = inet6_sk(sk); 146 147 *(struct in6_addr *)r->id.idiag_src = np->rcv_saddr; 148 *(struct in6_addr *)r->id.idiag_dst = np->daddr; 149 if (ext & (1 << (INET_DIAG_TCLASS - 1))) 150 RTA_PUT_U8(skb, INET_DIAG_TCLASS, np->tclass); 151 } 152 #endif 153 154 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ) 155 156 if (icsk->icsk_pending == ICSK_TIME_RETRANS) { 157 r->idiag_timer = 1; 158 r->idiag_retrans = icsk->icsk_retransmits; 159 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 160 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { 161 r->idiag_timer = 4; 162 r->idiag_retrans = icsk->icsk_probes_out; 163 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 164 } else if (timer_pending(&sk->sk_timer)) { 165 r->idiag_timer = 2; 166 r->idiag_retrans = icsk->icsk_probes_out; 167 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires); 168 } else { 169 r->idiag_timer = 0; 170 r->idiag_expires = 0; 171 } 172 #undef EXPIRES_IN_MS 173 174 r->idiag_uid = sock_i_uid(sk); 175 r->idiag_inode = sock_i_ino(sk); 176 177 if (minfo) { 178 minfo->idiag_rmem = sk_rmem_alloc_get(sk); 179 minfo->idiag_wmem = sk->sk_wmem_queued; 180 minfo->idiag_fmem = sk->sk_forward_alloc; 181 minfo->idiag_tmem = sk_wmem_alloc_get(sk); 182 } 183 184 handler->idiag_get_info(sk, r, info); 185 186 if (sk->sk_state < TCP_TIME_WAIT && 187 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info) 188 icsk->icsk_ca_ops->get_info(sk, ext, skb); 189 190 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 191 return skb->len; 192 193 rtattr_failure: 194 nlmsg_failure: 195 nlmsg_trim(skb, b); 196 return -EMSGSIZE; 197 } 198 199 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw, 200 struct sk_buff *skb, int ext, u32 pid, 201 u32 seq, u16 nlmsg_flags, 202 const struct nlmsghdr *unlh) 203 { 204 long tmo; 205 struct inet_diag_msg *r; 206 const unsigned char *previous_tail = skb_tail_pointer(skb); 207 struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq, 208 unlh->nlmsg_type, sizeof(*r)); 209 210 r = NLMSG_DATA(nlh); 211 BUG_ON(tw->tw_state != TCP_TIME_WAIT); 212 213 nlh->nlmsg_flags = nlmsg_flags; 214 215 tmo = tw->tw_ttd - jiffies; 216 if (tmo < 0) 217 tmo = 0; 218 219 r->idiag_family = tw->tw_family; 220 r->idiag_retrans = 0; 221 r->id.idiag_if = tw->tw_bound_dev_if; 222 r->id.idiag_cookie[0] = (u32)(unsigned long)tw; 223 r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1); 224 r->id.idiag_sport = tw->tw_sport; 225 r->id.idiag_dport = tw->tw_dport; 226 r->id.idiag_src[0] = tw->tw_rcv_saddr; 227 r->id.idiag_dst[0] = tw->tw_daddr; 228 r->idiag_state = tw->tw_substate; 229 r->idiag_timer = 3; 230 r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ); 231 r->idiag_rqueue = 0; 232 r->idiag_wqueue = 0; 233 r->idiag_uid = 0; 234 r->idiag_inode = 0; 235 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 236 if (tw->tw_family == AF_INET6) { 237 const struct inet6_timewait_sock *tw6 = 238 inet6_twsk((struct sock *)tw); 239 240 *(struct in6_addr *)r->id.idiag_src = tw6->tw_v6_rcv_saddr; 241 *(struct in6_addr *)r->id.idiag_dst = tw6->tw_v6_daddr; 242 } 243 #endif 244 nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail; 245 return skb->len; 246 nlmsg_failure: 247 nlmsg_trim(skb, previous_tail); 248 return -EMSGSIZE; 249 } 250 251 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, 252 int ext, u32 pid, u32 seq, u16 nlmsg_flags, 253 const struct nlmsghdr *unlh) 254 { 255 if (sk->sk_state == TCP_TIME_WAIT) 256 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk, 257 skb, ext, pid, seq, nlmsg_flags, 258 unlh); 259 return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh); 260 } 261 262 static int inet_diag_get_exact(struct sk_buff *in_skb, 263 const struct nlmsghdr *nlh) 264 { 265 int err; 266 struct sock *sk; 267 struct inet_diag_req *req = NLMSG_DATA(nlh); 268 struct sk_buff *rep; 269 struct inet_hashinfo *hashinfo; 270 const struct inet_diag_handler *handler; 271 272 handler = inet_diag_lock_handler(inet_diag_type2proto(nlh->nlmsg_type)); 273 if (IS_ERR(handler)) { 274 err = PTR_ERR(handler); 275 goto unlock; 276 } 277 278 hashinfo = handler->idiag_hashinfo; 279 err = -EINVAL; 280 281 if (req->idiag_family == AF_INET) { 282 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0], 283 req->id.idiag_dport, req->id.idiag_src[0], 284 req->id.idiag_sport, req->id.idiag_if); 285 } 286 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 287 else if (req->idiag_family == AF_INET6) { 288 sk = inet6_lookup(&init_net, hashinfo, 289 (struct in6_addr *)req->id.idiag_dst, 290 req->id.idiag_dport, 291 (struct in6_addr *)req->id.idiag_src, 292 req->id.idiag_sport, 293 req->id.idiag_if); 294 } 295 #endif 296 else { 297 goto unlock; 298 } 299 300 err = -ENOENT; 301 if (sk == NULL) 302 goto unlock; 303 304 err = -ESTALE; 305 if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE || 306 req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) && 307 ((u32)(unsigned long)sk != req->id.idiag_cookie[0] || 308 (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1])) 309 goto out; 310 311 err = -ENOMEM; 312 rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) + 313 sizeof(struct inet_diag_meminfo) + 314 handler->idiag_info_size + 64)), 315 GFP_KERNEL); 316 if (!rep) 317 goto out; 318 319 err = sk_diag_fill(sk, rep, req->idiag_ext, 320 NETLINK_CB(in_skb).pid, 321 nlh->nlmsg_seq, 0, nlh); 322 if (err < 0) { 323 WARN_ON(err == -EMSGSIZE); 324 kfree_skb(rep); 325 goto out; 326 } 327 err = netlink_unicast(sdiagnl, rep, NETLINK_CB(in_skb).pid, 328 MSG_DONTWAIT); 329 if (err > 0) 330 err = 0; 331 332 out: 333 if (sk) { 334 if (sk->sk_state == TCP_TIME_WAIT) 335 inet_twsk_put((struct inet_timewait_sock *)sk); 336 else 337 sock_put(sk); 338 } 339 unlock: 340 inet_diag_unlock_handler(handler); 341 return err; 342 } 343 344 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits) 345 { 346 int words = bits >> 5; 347 348 bits &= 0x1f; 349 350 if (words) { 351 if (memcmp(a1, a2, words << 2)) 352 return 0; 353 } 354 if (bits) { 355 __be32 w1, w2; 356 __be32 mask; 357 358 w1 = a1[words]; 359 w2 = a2[words]; 360 361 mask = htonl((0xffffffff) << (32 - bits)); 362 363 if ((w1 ^ w2) & mask) 364 return 0; 365 } 366 367 return 1; 368 } 369 370 371 static int inet_diag_bc_run(const void *bc, int len, 372 const struct inet_diag_entry *entry) 373 { 374 while (len > 0) { 375 int yes = 1; 376 const struct inet_diag_bc_op *op = bc; 377 378 switch (op->code) { 379 case INET_DIAG_BC_NOP: 380 break; 381 case INET_DIAG_BC_JMP: 382 yes = 0; 383 break; 384 case INET_DIAG_BC_S_GE: 385 yes = entry->sport >= op[1].no; 386 break; 387 case INET_DIAG_BC_S_LE: 388 yes = entry->sport <= op[1].no; 389 break; 390 case INET_DIAG_BC_D_GE: 391 yes = entry->dport >= op[1].no; 392 break; 393 case INET_DIAG_BC_D_LE: 394 yes = entry->dport <= op[1].no; 395 break; 396 case INET_DIAG_BC_AUTO: 397 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); 398 break; 399 case INET_DIAG_BC_S_COND: 400 case INET_DIAG_BC_D_COND: { 401 struct inet_diag_hostcond *cond; 402 __be32 *addr; 403 404 cond = (struct inet_diag_hostcond *)(op + 1); 405 if (cond->port != -1 && 406 cond->port != (op->code == INET_DIAG_BC_S_COND ? 407 entry->sport : entry->dport)) { 408 yes = 0; 409 break; 410 } 411 412 if (cond->prefix_len == 0) 413 break; 414 415 if (op->code == INET_DIAG_BC_S_COND) 416 addr = entry->saddr; 417 else 418 addr = entry->daddr; 419 420 if (bitstring_match(addr, cond->addr, 421 cond->prefix_len)) 422 break; 423 if (entry->family == AF_INET6 && 424 cond->family == AF_INET) { 425 if (addr[0] == 0 && addr[1] == 0 && 426 addr[2] == htonl(0xffff) && 427 bitstring_match(addr + 3, cond->addr, 428 cond->prefix_len)) 429 break; 430 } 431 yes = 0; 432 break; 433 } 434 } 435 436 if (yes) { 437 len -= op->yes; 438 bc += op->yes; 439 } else { 440 len -= op->no; 441 bc += op->no; 442 } 443 } 444 return len == 0; 445 } 446 447 static int valid_cc(const void *bc, int len, int cc) 448 { 449 while (len >= 0) { 450 const struct inet_diag_bc_op *op = bc; 451 452 if (cc > len) 453 return 0; 454 if (cc == len) 455 return 1; 456 if (op->yes < 4 || op->yes & 3) 457 return 0; 458 len -= op->yes; 459 bc += op->yes; 460 } 461 return 0; 462 } 463 464 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len) 465 { 466 const void *bc = bytecode; 467 int len = bytecode_len; 468 469 while (len > 0) { 470 const struct inet_diag_bc_op *op = bc; 471 472 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len); 473 switch (op->code) { 474 case INET_DIAG_BC_AUTO: 475 case INET_DIAG_BC_S_COND: 476 case INET_DIAG_BC_D_COND: 477 case INET_DIAG_BC_S_GE: 478 case INET_DIAG_BC_S_LE: 479 case INET_DIAG_BC_D_GE: 480 case INET_DIAG_BC_D_LE: 481 case INET_DIAG_BC_JMP: 482 if (op->no < 4 || op->no > len + 4 || op->no & 3) 483 return -EINVAL; 484 if (op->no < len && 485 !valid_cc(bytecode, bytecode_len, len - op->no)) 486 return -EINVAL; 487 break; 488 case INET_DIAG_BC_NOP: 489 break; 490 default: 491 return -EINVAL; 492 } 493 if (op->yes < 4 || op->yes > len + 4 || op->yes & 3) 494 return -EINVAL; 495 bc += op->yes; 496 len -= op->yes; 497 } 498 return len == 0 ? 0 : -EINVAL; 499 } 500 501 static int inet_csk_diag_dump(struct sock *sk, 502 struct sk_buff *skb, 503 struct netlink_callback *cb, 504 const struct nlattr *bc) 505 { 506 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 507 508 if (bc != NULL) { 509 struct inet_diag_entry entry; 510 struct inet_sock *inet = inet_sk(sk); 511 512 entry.family = sk->sk_family; 513 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 514 if (entry.family == AF_INET6) { 515 struct ipv6_pinfo *np = inet6_sk(sk); 516 517 entry.saddr = np->rcv_saddr.s6_addr32; 518 entry.daddr = np->daddr.s6_addr32; 519 } else 520 #endif 521 { 522 entry.saddr = &inet->inet_rcv_saddr; 523 entry.daddr = &inet->inet_daddr; 524 } 525 entry.sport = inet->inet_num; 526 entry.dport = ntohs(inet->inet_dport); 527 entry.userlocks = sk->sk_userlocks; 528 529 if (!inet_diag_bc_run(nla_data(bc), nla_len(bc), &entry)) 530 return 0; 531 } 532 533 return inet_csk_diag_fill(sk, skb, r->idiag_ext, 534 NETLINK_CB(cb->skb).pid, 535 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 536 } 537 538 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw, 539 struct sk_buff *skb, 540 struct netlink_callback *cb, 541 const struct nlattr *bc) 542 { 543 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 544 545 if (bc != NULL) { 546 struct inet_diag_entry entry; 547 548 entry.family = tw->tw_family; 549 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 550 if (tw->tw_family == AF_INET6) { 551 struct inet6_timewait_sock *tw6 = 552 inet6_twsk((struct sock *)tw); 553 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32; 554 entry.daddr = tw6->tw_v6_daddr.s6_addr32; 555 } else 556 #endif 557 { 558 entry.saddr = &tw->tw_rcv_saddr; 559 entry.daddr = &tw->tw_daddr; 560 } 561 entry.sport = tw->tw_num; 562 entry.dport = ntohs(tw->tw_dport); 563 entry.userlocks = 0; 564 565 if (!inet_diag_bc_run(nla_data(bc), nla_len(bc), &entry)) 566 return 0; 567 } 568 569 return inet_twsk_diag_fill(tw, skb, r->idiag_ext, 570 NETLINK_CB(cb->skb).pid, 571 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 572 } 573 574 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk, 575 struct request_sock *req, u32 pid, u32 seq, 576 const struct nlmsghdr *unlh) 577 { 578 const struct inet_request_sock *ireq = inet_rsk(req); 579 struct inet_sock *inet = inet_sk(sk); 580 unsigned char *b = skb_tail_pointer(skb); 581 struct inet_diag_msg *r; 582 struct nlmsghdr *nlh; 583 long tmo; 584 585 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); 586 nlh->nlmsg_flags = NLM_F_MULTI; 587 r = NLMSG_DATA(nlh); 588 589 r->idiag_family = sk->sk_family; 590 r->idiag_state = TCP_SYN_RECV; 591 r->idiag_timer = 1; 592 r->idiag_retrans = req->retrans; 593 594 r->id.idiag_if = sk->sk_bound_dev_if; 595 r->id.idiag_cookie[0] = (u32)(unsigned long)req; 596 r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1); 597 598 tmo = req->expires - jiffies; 599 if (tmo < 0) 600 tmo = 0; 601 602 r->id.idiag_sport = inet->inet_sport; 603 r->id.idiag_dport = ireq->rmt_port; 604 r->id.idiag_src[0] = ireq->loc_addr; 605 r->id.idiag_dst[0] = ireq->rmt_addr; 606 r->idiag_expires = jiffies_to_msecs(tmo); 607 r->idiag_rqueue = 0; 608 r->idiag_wqueue = 0; 609 r->idiag_uid = sock_i_uid(sk); 610 r->idiag_inode = 0; 611 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 612 if (r->idiag_family == AF_INET6) { 613 *(struct in6_addr *)r->id.idiag_src = inet6_rsk(req)->loc_addr; 614 *(struct in6_addr *)r->id.idiag_dst = inet6_rsk(req)->rmt_addr; 615 } 616 #endif 617 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 618 619 return skb->len; 620 621 nlmsg_failure: 622 nlmsg_trim(skb, b); 623 return -1; 624 } 625 626 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk, 627 struct netlink_callback *cb, 628 const struct nlattr *bc) 629 { 630 struct inet_diag_entry entry; 631 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 632 struct inet_connection_sock *icsk = inet_csk(sk); 633 struct listen_sock *lopt; 634 struct inet_sock *inet = inet_sk(sk); 635 int j, s_j; 636 int reqnum, s_reqnum; 637 int err = 0; 638 639 s_j = cb->args[3]; 640 s_reqnum = cb->args[4]; 641 642 if (s_j > 0) 643 s_j--; 644 645 entry.family = sk->sk_family; 646 647 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 648 649 lopt = icsk->icsk_accept_queue.listen_opt; 650 if (!lopt || !lopt->qlen) 651 goto out; 652 653 if (bc != NULL) { 654 entry.sport = inet->inet_num; 655 entry.userlocks = sk->sk_userlocks; 656 } 657 658 for (j = s_j; j < lopt->nr_table_entries; j++) { 659 struct request_sock *req, *head = lopt->syn_table[j]; 660 661 reqnum = 0; 662 for (req = head; req; reqnum++, req = req->dl_next) { 663 struct inet_request_sock *ireq = inet_rsk(req); 664 665 if (reqnum < s_reqnum) 666 continue; 667 if (r->id.idiag_dport != ireq->rmt_port && 668 r->id.idiag_dport) 669 continue; 670 671 if (bc) { 672 entry.saddr = 673 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 674 (entry.family == AF_INET6) ? 675 inet6_rsk(req)->loc_addr.s6_addr32 : 676 #endif 677 &ireq->loc_addr; 678 entry.daddr = 679 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 680 (entry.family == AF_INET6) ? 681 inet6_rsk(req)->rmt_addr.s6_addr32 : 682 #endif 683 &ireq->rmt_addr; 684 entry.dport = ntohs(ireq->rmt_port); 685 686 if (!inet_diag_bc_run(nla_data(bc), 687 nla_len(bc), &entry)) 688 continue; 689 } 690 691 err = inet_diag_fill_req(skb, sk, req, 692 NETLINK_CB(cb->skb).pid, 693 cb->nlh->nlmsg_seq, cb->nlh); 694 if (err < 0) { 695 cb->args[3] = j + 1; 696 cb->args[4] = reqnum; 697 goto out; 698 } 699 } 700 701 s_reqnum = 0; 702 } 703 704 out: 705 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 706 707 return err; 708 } 709 710 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) 711 { 712 int i, num; 713 int s_i, s_num; 714 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 715 const struct inet_diag_handler *handler; 716 struct inet_hashinfo *hashinfo; 717 const struct nlattr *bc = NULL; 718 719 if (nlmsg_attrlen(cb->nlh, sizeof(struct inet_diag_req))) 720 bc = nlmsg_find_attr(cb->nlh, sizeof(*r), INET_DIAG_REQ_BYTECODE); 721 722 handler = inet_diag_lock_handler(inet_diag_type2proto(cb->nlh->nlmsg_type)); 723 if (IS_ERR(handler)) 724 goto unlock; 725 726 hashinfo = handler->idiag_hashinfo; 727 728 s_i = cb->args[1]; 729 s_num = num = cb->args[2]; 730 731 if (cb->args[0] == 0) { 732 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV))) 733 goto skip_listen_ht; 734 735 for (i = s_i; i < INET_LHTABLE_SIZE; i++) { 736 struct sock *sk; 737 struct hlist_nulls_node *node; 738 struct inet_listen_hashbucket *ilb; 739 740 num = 0; 741 ilb = &hashinfo->listening_hash[i]; 742 spin_lock_bh(&ilb->lock); 743 sk_nulls_for_each(sk, node, &ilb->head) { 744 struct inet_sock *inet = inet_sk(sk); 745 746 if (num < s_num) { 747 num++; 748 continue; 749 } 750 751 if (r->id.idiag_sport != inet->inet_sport && 752 r->id.idiag_sport) 753 goto next_listen; 754 755 if (!(r->idiag_states & TCPF_LISTEN) || 756 r->id.idiag_dport || 757 cb->args[3] > 0) 758 goto syn_recv; 759 760 if (inet_csk_diag_dump(sk, skb, cb, bc) < 0) { 761 spin_unlock_bh(&ilb->lock); 762 goto done; 763 } 764 765 syn_recv: 766 if (!(r->idiag_states & TCPF_SYN_RECV)) 767 goto next_listen; 768 769 if (inet_diag_dump_reqs(skb, sk, cb, bc) < 0) { 770 spin_unlock_bh(&ilb->lock); 771 goto done; 772 } 773 774 next_listen: 775 cb->args[3] = 0; 776 cb->args[4] = 0; 777 ++num; 778 } 779 spin_unlock_bh(&ilb->lock); 780 781 s_num = 0; 782 cb->args[3] = 0; 783 cb->args[4] = 0; 784 } 785 skip_listen_ht: 786 cb->args[0] = 1; 787 s_i = num = s_num = 0; 788 } 789 790 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV))) 791 goto unlock; 792 793 for (i = s_i; i <= hashinfo->ehash_mask; i++) { 794 struct inet_ehash_bucket *head = &hashinfo->ehash[i]; 795 spinlock_t *lock = inet_ehash_lockp(hashinfo, i); 796 struct sock *sk; 797 struct hlist_nulls_node *node; 798 799 num = 0; 800 801 if (hlist_nulls_empty(&head->chain) && 802 hlist_nulls_empty(&head->twchain)) 803 continue; 804 805 if (i > s_i) 806 s_num = 0; 807 808 spin_lock_bh(lock); 809 sk_nulls_for_each(sk, node, &head->chain) { 810 struct inet_sock *inet = inet_sk(sk); 811 812 if (num < s_num) 813 goto next_normal; 814 if (!(r->idiag_states & (1 << sk->sk_state))) 815 goto next_normal; 816 if (r->id.idiag_sport != inet->inet_sport && 817 r->id.idiag_sport) 818 goto next_normal; 819 if (r->id.idiag_dport != inet->inet_dport && 820 r->id.idiag_dport) 821 goto next_normal; 822 if (inet_csk_diag_dump(sk, skb, cb, bc) < 0) { 823 spin_unlock_bh(lock); 824 goto done; 825 } 826 next_normal: 827 ++num; 828 } 829 830 if (r->idiag_states & TCPF_TIME_WAIT) { 831 struct inet_timewait_sock *tw; 832 833 inet_twsk_for_each(tw, node, 834 &head->twchain) { 835 836 if (num < s_num) 837 goto next_dying; 838 if (r->id.idiag_sport != tw->tw_sport && 839 r->id.idiag_sport) 840 goto next_dying; 841 if (r->id.idiag_dport != tw->tw_dport && 842 r->id.idiag_dport) 843 goto next_dying; 844 if (inet_twsk_diag_dump(tw, skb, cb, bc) < 0) { 845 spin_unlock_bh(lock); 846 goto done; 847 } 848 next_dying: 849 ++num; 850 } 851 } 852 spin_unlock_bh(lock); 853 } 854 855 done: 856 cb->args[1] = i; 857 cb->args[2] = num; 858 unlock: 859 inet_diag_unlock_handler(handler); 860 return skb->len; 861 } 862 863 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh) 864 { 865 int hdrlen = sizeof(struct inet_diag_req); 866 867 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX || 868 nlmsg_len(nlh) < hdrlen) 869 return -EINVAL; 870 871 if (nlh->nlmsg_flags & NLM_F_DUMP) { 872 if (nlmsg_attrlen(nlh, hdrlen)) { 873 struct nlattr *attr; 874 875 attr = nlmsg_find_attr(nlh, hdrlen, 876 INET_DIAG_REQ_BYTECODE); 877 if (attr == NULL || 878 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 879 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 880 return -EINVAL; 881 } 882 883 return netlink_dump_start(sdiagnl, skb, nlh, 884 inet_diag_dump, NULL, 0); 885 } 886 887 return inet_diag_get_exact(skb, nlh); 888 } 889 890 static int __sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 891 { 892 return -EOPNOTSUPP; 893 } 894 895 static int sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 896 { 897 switch (nlh->nlmsg_type) { 898 case TCPDIAG_GETSOCK: 899 case DCCPDIAG_GETSOCK: 900 return inet_diag_rcv_msg_compat(skb, nlh); 901 case SOCK_DIAG_BY_FAMILY: 902 return __sock_diag_rcv_msg(skb, nlh); 903 default: 904 return -EINVAL; 905 } 906 } 907 908 static DEFINE_MUTEX(sock_diag_mutex); 909 910 static void sock_diag_rcv(struct sk_buff *skb) 911 { 912 mutex_lock(&sock_diag_mutex); 913 netlink_rcv_skb(skb, &sock_diag_rcv_msg); 914 mutex_unlock(&sock_diag_mutex); 915 } 916 917 int inet_diag_register(const struct inet_diag_handler *h) 918 { 919 const __u16 type = h->idiag_type; 920 int err = -EINVAL; 921 922 if (type >= IPPROTO_MAX) 923 goto out; 924 925 mutex_lock(&inet_diag_table_mutex); 926 err = -EEXIST; 927 if (inet_diag_table[type] == NULL) { 928 inet_diag_table[type] = h; 929 err = 0; 930 } 931 mutex_unlock(&inet_diag_table_mutex); 932 out: 933 return err; 934 } 935 EXPORT_SYMBOL_GPL(inet_diag_register); 936 937 void inet_diag_unregister(const struct inet_diag_handler *h) 938 { 939 const __u16 type = h->idiag_type; 940 941 if (type >= IPPROTO_MAX) 942 return; 943 944 mutex_lock(&inet_diag_table_mutex); 945 inet_diag_table[type] = NULL; 946 mutex_unlock(&inet_diag_table_mutex); 947 } 948 EXPORT_SYMBOL_GPL(inet_diag_unregister); 949 950 static int __init inet_diag_init(void) 951 { 952 const int inet_diag_table_size = (IPPROTO_MAX * 953 sizeof(struct inet_diag_handler *)); 954 int err = -ENOMEM; 955 956 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL); 957 if (!inet_diag_table) 958 goto out; 959 960 sdiagnl = netlink_kernel_create(&init_net, NETLINK_SOCK_DIAG, 0, 961 sock_diag_rcv, NULL, THIS_MODULE); 962 if (sdiagnl == NULL) 963 goto out_free_table; 964 err = 0; 965 out: 966 return err; 967 out_free_table: 968 kfree(inet_diag_table); 969 goto out; 970 } 971 972 static void __exit inet_diag_exit(void) 973 { 974 netlink_kernel_release(sdiagnl); 975 kfree(inet_diag_table); 976 } 977 978 module_init(inet_diag_init); 979 module_exit(inet_diag_exit); 980 MODULE_LICENSE("GPL"); 981 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_SOCK_DIAG); 982