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 #include <linux/sock_diag.h> 37 38 static const struct inet_diag_handler **inet_diag_table; 39 40 struct inet_diag_entry { 41 __be32 *saddr; 42 __be32 *daddr; 43 u16 sport; 44 u16 dport; 45 u16 family; 46 u16 userlocks; 47 }; 48 49 static struct sock *sdiagnl; 50 51 #define INET_DIAG_PUT(skb, attrtype, attrlen) \ 52 RTA_DATA(__RTA_PUT(skb, attrtype, attrlen)) 53 54 static inline int inet_diag_type2proto(int type) 55 { 56 switch (type) { 57 case TCPDIAG_GETSOCK: 58 return IPPROTO_TCP; 59 case DCCPDIAG_GETSOCK: 60 return IPPROTO_DCCP; 61 default: 62 return 0; 63 } 64 } 65 66 static DEFINE_MUTEX(inet_diag_table_mutex); 67 68 static const struct inet_diag_handler *inet_diag_lock_handler(int proto) 69 { 70 if (!inet_diag_table[proto]) 71 request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK, 72 NETLINK_SOCK_DIAG, proto); 73 74 mutex_lock(&inet_diag_table_mutex); 75 if (!inet_diag_table[proto]) 76 return ERR_PTR(-ENOENT); 77 78 return inet_diag_table[proto]; 79 } 80 81 static inline void inet_diag_unlock_handler( 82 const struct inet_diag_handler *handler) 83 { 84 mutex_unlock(&inet_diag_table_mutex); 85 } 86 87 static int inet_csk_diag_fill(struct sock *sk, 88 struct sk_buff *skb, 89 int ext, u32 pid, u32 seq, u16 nlmsg_flags, 90 const struct nlmsghdr *unlh) 91 { 92 const struct inet_sock *inet = inet_sk(sk); 93 const struct inet_connection_sock *icsk = inet_csk(sk); 94 struct inet_diag_msg *r; 95 struct nlmsghdr *nlh; 96 void *info = NULL; 97 struct inet_diag_meminfo *minfo = NULL; 98 unsigned char *b = skb_tail_pointer(skb); 99 const struct inet_diag_handler *handler; 100 101 handler = inet_diag_table[inet_diag_type2proto(unlh->nlmsg_type)]; 102 BUG_ON(handler == NULL); 103 104 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); 105 nlh->nlmsg_flags = nlmsg_flags; 106 107 r = NLMSG_DATA(nlh); 108 BUG_ON(sk->sk_state == TCP_TIME_WAIT); 109 110 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) 111 minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo)); 112 113 if (ext & (1 << (INET_DIAG_INFO - 1))) 114 info = INET_DIAG_PUT(skb, INET_DIAG_INFO, 115 handler->idiag_info_size); 116 117 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) { 118 const size_t len = strlen(icsk->icsk_ca_ops->name); 119 120 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1), 121 icsk->icsk_ca_ops->name); 122 } 123 124 r->idiag_family = sk->sk_family; 125 r->idiag_state = sk->sk_state; 126 r->idiag_timer = 0; 127 r->idiag_retrans = 0; 128 129 r->id.idiag_if = sk->sk_bound_dev_if; 130 r->id.idiag_cookie[0] = (u32)(unsigned long)sk; 131 r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1); 132 133 r->id.idiag_sport = inet->inet_sport; 134 r->id.idiag_dport = inet->inet_dport; 135 r->id.idiag_src[0] = inet->inet_rcv_saddr; 136 r->id.idiag_dst[0] = inet->inet_daddr; 137 138 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections, 139 * hence this needs to be included regardless of socket family. 140 */ 141 if (ext & (1 << (INET_DIAG_TOS - 1))) 142 RTA_PUT_U8(skb, INET_DIAG_TOS, inet->tos); 143 144 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 145 if (r->idiag_family == AF_INET6) { 146 const struct ipv6_pinfo *np = inet6_sk(sk); 147 148 *(struct in6_addr *)r->id.idiag_src = np->rcv_saddr; 149 *(struct in6_addr *)r->id.idiag_dst = np->daddr; 150 if (ext & (1 << (INET_DIAG_TCLASS - 1))) 151 RTA_PUT_U8(skb, INET_DIAG_TCLASS, np->tclass); 152 } 153 #endif 154 155 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ) 156 157 if (icsk->icsk_pending == ICSK_TIME_RETRANS) { 158 r->idiag_timer = 1; 159 r->idiag_retrans = icsk->icsk_retransmits; 160 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 161 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { 162 r->idiag_timer = 4; 163 r->idiag_retrans = icsk->icsk_probes_out; 164 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 165 } else if (timer_pending(&sk->sk_timer)) { 166 r->idiag_timer = 2; 167 r->idiag_retrans = icsk->icsk_probes_out; 168 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires); 169 } else { 170 r->idiag_timer = 0; 171 r->idiag_expires = 0; 172 } 173 #undef EXPIRES_IN_MS 174 175 r->idiag_uid = sock_i_uid(sk); 176 r->idiag_inode = sock_i_ino(sk); 177 178 if (minfo) { 179 minfo->idiag_rmem = sk_rmem_alloc_get(sk); 180 minfo->idiag_wmem = sk->sk_wmem_queued; 181 minfo->idiag_fmem = sk->sk_forward_alloc; 182 minfo->idiag_tmem = sk_wmem_alloc_get(sk); 183 } 184 185 handler->idiag_get_info(sk, r, info); 186 187 if (sk->sk_state < TCP_TIME_WAIT && 188 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info) 189 icsk->icsk_ca_ops->get_info(sk, ext, skb); 190 191 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 192 return skb->len; 193 194 rtattr_failure: 195 nlmsg_failure: 196 nlmsg_trim(skb, b); 197 return -EMSGSIZE; 198 } 199 200 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw, 201 struct sk_buff *skb, int ext, u32 pid, 202 u32 seq, u16 nlmsg_flags, 203 const struct nlmsghdr *unlh) 204 { 205 long tmo; 206 struct inet_diag_msg *r; 207 const unsigned char *previous_tail = skb_tail_pointer(skb); 208 struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq, 209 unlh->nlmsg_type, sizeof(*r)); 210 211 r = NLMSG_DATA(nlh); 212 BUG_ON(tw->tw_state != TCP_TIME_WAIT); 213 214 nlh->nlmsg_flags = nlmsg_flags; 215 216 tmo = tw->tw_ttd - jiffies; 217 if (tmo < 0) 218 tmo = 0; 219 220 r->idiag_family = tw->tw_family; 221 r->idiag_retrans = 0; 222 r->id.idiag_if = tw->tw_bound_dev_if; 223 r->id.idiag_cookie[0] = (u32)(unsigned long)tw; 224 r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1); 225 r->id.idiag_sport = tw->tw_sport; 226 r->id.idiag_dport = tw->tw_dport; 227 r->id.idiag_src[0] = tw->tw_rcv_saddr; 228 r->id.idiag_dst[0] = tw->tw_daddr; 229 r->idiag_state = tw->tw_substate; 230 r->idiag_timer = 3; 231 r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ); 232 r->idiag_rqueue = 0; 233 r->idiag_wqueue = 0; 234 r->idiag_uid = 0; 235 r->idiag_inode = 0; 236 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 237 if (tw->tw_family == AF_INET6) { 238 const struct inet6_timewait_sock *tw6 = 239 inet6_twsk((struct sock *)tw); 240 241 *(struct in6_addr *)r->id.idiag_src = tw6->tw_v6_rcv_saddr; 242 *(struct in6_addr *)r->id.idiag_dst = tw6->tw_v6_daddr; 243 } 244 #endif 245 nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail; 246 return skb->len; 247 nlmsg_failure: 248 nlmsg_trim(skb, previous_tail); 249 return -EMSGSIZE; 250 } 251 252 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, 253 int ext, u32 pid, u32 seq, u16 nlmsg_flags, 254 const struct nlmsghdr *unlh) 255 { 256 if (sk->sk_state == TCP_TIME_WAIT) 257 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk, 258 skb, ext, pid, seq, nlmsg_flags, 259 unlh); 260 return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh); 261 } 262 263 static int inet_diag_get_exact(struct sk_buff *in_skb, 264 const struct nlmsghdr *nlh, 265 struct inet_diag_req *req) 266 { 267 int err; 268 struct sock *sk; 269 struct sk_buff *rep; 270 struct inet_hashinfo *hashinfo; 271 const struct inet_diag_handler *handler; 272 273 handler = inet_diag_lock_handler(req->sdiag_protocol); 274 if (IS_ERR(handler)) { 275 err = PTR_ERR(handler); 276 goto unlock; 277 } 278 279 hashinfo = handler->idiag_hashinfo; 280 err = -EINVAL; 281 282 if (req->sdiag_family == AF_INET) { 283 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0], 284 req->id.idiag_dport, req->id.idiag_src[0], 285 req->id.idiag_sport, req->id.idiag_if); 286 } 287 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 288 else if (req->sdiag_family == AF_INET6) { 289 sk = inet6_lookup(&init_net, hashinfo, 290 (struct in6_addr *)req->id.idiag_dst, 291 req->id.idiag_dport, 292 (struct in6_addr *)req->id.idiag_src, 293 req->id.idiag_sport, 294 req->id.idiag_if); 295 } 296 #endif 297 else { 298 goto unlock; 299 } 300 301 err = -ENOENT; 302 if (sk == NULL) 303 goto unlock; 304 305 err = -ESTALE; 306 if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE || 307 req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) && 308 ((u32)(unsigned long)sk != req->id.idiag_cookie[0] || 309 (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1])) 310 goto out; 311 312 err = -ENOMEM; 313 rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) + 314 sizeof(struct inet_diag_meminfo) + 315 handler->idiag_info_size + 64)), 316 GFP_KERNEL); 317 if (!rep) 318 goto out; 319 320 err = sk_diag_fill(sk, rep, req->idiag_ext, 321 NETLINK_CB(in_skb).pid, 322 nlh->nlmsg_seq, 0, nlh); 323 if (err < 0) { 324 WARN_ON(err == -EMSGSIZE); 325 kfree_skb(rep); 326 goto out; 327 } 328 err = netlink_unicast(sdiagnl, rep, NETLINK_CB(in_skb).pid, 329 MSG_DONTWAIT); 330 if (err > 0) 331 err = 0; 332 333 out: 334 if (sk) { 335 if (sk->sk_state == TCP_TIME_WAIT) 336 inet_twsk_put((struct inet_timewait_sock *)sk); 337 else 338 sock_put(sk); 339 } 340 unlock: 341 inet_diag_unlock_handler(handler); 342 return err; 343 } 344 345 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits) 346 { 347 int words = bits >> 5; 348 349 bits &= 0x1f; 350 351 if (words) { 352 if (memcmp(a1, a2, words << 2)) 353 return 0; 354 } 355 if (bits) { 356 __be32 w1, w2; 357 __be32 mask; 358 359 w1 = a1[words]; 360 w2 = a2[words]; 361 362 mask = htonl((0xffffffff) << (32 - bits)); 363 364 if ((w1 ^ w2) & mask) 365 return 0; 366 } 367 368 return 1; 369 } 370 371 372 static int inet_diag_bc_run(const void *bc, int len, 373 const struct inet_diag_entry *entry) 374 { 375 while (len > 0) { 376 int yes = 1; 377 const struct inet_diag_bc_op *op = bc; 378 379 switch (op->code) { 380 case INET_DIAG_BC_NOP: 381 break; 382 case INET_DIAG_BC_JMP: 383 yes = 0; 384 break; 385 case INET_DIAG_BC_S_GE: 386 yes = entry->sport >= op[1].no; 387 break; 388 case INET_DIAG_BC_S_LE: 389 yes = entry->sport <= op[1].no; 390 break; 391 case INET_DIAG_BC_D_GE: 392 yes = entry->dport >= op[1].no; 393 break; 394 case INET_DIAG_BC_D_LE: 395 yes = entry->dport <= op[1].no; 396 break; 397 case INET_DIAG_BC_AUTO: 398 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); 399 break; 400 case INET_DIAG_BC_S_COND: 401 case INET_DIAG_BC_D_COND: { 402 struct inet_diag_hostcond *cond; 403 __be32 *addr; 404 405 cond = (struct inet_diag_hostcond *)(op + 1); 406 if (cond->port != -1 && 407 cond->port != (op->code == INET_DIAG_BC_S_COND ? 408 entry->sport : entry->dport)) { 409 yes = 0; 410 break; 411 } 412 413 if (cond->prefix_len == 0) 414 break; 415 416 if (op->code == INET_DIAG_BC_S_COND) 417 addr = entry->saddr; 418 else 419 addr = entry->daddr; 420 421 if (bitstring_match(addr, cond->addr, 422 cond->prefix_len)) 423 break; 424 if (entry->family == AF_INET6 && 425 cond->family == AF_INET) { 426 if (addr[0] == 0 && addr[1] == 0 && 427 addr[2] == htonl(0xffff) && 428 bitstring_match(addr + 3, cond->addr, 429 cond->prefix_len)) 430 break; 431 } 432 yes = 0; 433 break; 434 } 435 } 436 437 if (yes) { 438 len -= op->yes; 439 bc += op->yes; 440 } else { 441 len -= op->no; 442 bc += op->no; 443 } 444 } 445 return len == 0; 446 } 447 448 static int valid_cc(const void *bc, int len, int cc) 449 { 450 while (len >= 0) { 451 const struct inet_diag_bc_op *op = bc; 452 453 if (cc > len) 454 return 0; 455 if (cc == len) 456 return 1; 457 if (op->yes < 4 || op->yes & 3) 458 return 0; 459 len -= op->yes; 460 bc += op->yes; 461 } 462 return 0; 463 } 464 465 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len) 466 { 467 const void *bc = bytecode; 468 int len = bytecode_len; 469 470 while (len > 0) { 471 const struct inet_diag_bc_op *op = bc; 472 473 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len); 474 switch (op->code) { 475 case INET_DIAG_BC_AUTO: 476 case INET_DIAG_BC_S_COND: 477 case INET_DIAG_BC_D_COND: 478 case INET_DIAG_BC_S_GE: 479 case INET_DIAG_BC_S_LE: 480 case INET_DIAG_BC_D_GE: 481 case INET_DIAG_BC_D_LE: 482 case INET_DIAG_BC_JMP: 483 if (op->no < 4 || op->no > len + 4 || op->no & 3) 484 return -EINVAL; 485 if (op->no < len && 486 !valid_cc(bytecode, bytecode_len, len - op->no)) 487 return -EINVAL; 488 break; 489 case INET_DIAG_BC_NOP: 490 break; 491 default: 492 return -EINVAL; 493 } 494 if (op->yes < 4 || op->yes > len + 4 || op->yes & 3) 495 return -EINVAL; 496 bc += op->yes; 497 len -= op->yes; 498 } 499 return len == 0 ? 0 : -EINVAL; 500 } 501 502 static int inet_csk_diag_dump(struct sock *sk, 503 struct sk_buff *skb, 504 struct netlink_callback *cb, 505 const struct nlattr *bc) 506 { 507 struct inet_diag_req_compat *r = NLMSG_DATA(cb->nlh); 508 509 if (bc != NULL) { 510 struct inet_diag_entry entry; 511 struct inet_sock *inet = inet_sk(sk); 512 513 entry.family = sk->sk_family; 514 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 515 if (entry.family == AF_INET6) { 516 struct ipv6_pinfo *np = inet6_sk(sk); 517 518 entry.saddr = np->rcv_saddr.s6_addr32; 519 entry.daddr = np->daddr.s6_addr32; 520 } else 521 #endif 522 { 523 entry.saddr = &inet->inet_rcv_saddr; 524 entry.daddr = &inet->inet_daddr; 525 } 526 entry.sport = inet->inet_num; 527 entry.dport = ntohs(inet->inet_dport); 528 entry.userlocks = sk->sk_userlocks; 529 530 if (!inet_diag_bc_run(nla_data(bc), nla_len(bc), &entry)) 531 return 0; 532 } 533 534 return inet_csk_diag_fill(sk, skb, r->idiag_ext, 535 NETLINK_CB(cb->skb).pid, 536 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 537 } 538 539 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw, 540 struct sk_buff *skb, 541 struct netlink_callback *cb, 542 const struct nlattr *bc) 543 { 544 struct inet_diag_req_compat *r = NLMSG_DATA(cb->nlh); 545 546 if (bc != NULL) { 547 struct inet_diag_entry entry; 548 549 entry.family = tw->tw_family; 550 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 551 if (tw->tw_family == AF_INET6) { 552 struct inet6_timewait_sock *tw6 = 553 inet6_twsk((struct sock *)tw); 554 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32; 555 entry.daddr = tw6->tw_v6_daddr.s6_addr32; 556 } else 557 #endif 558 { 559 entry.saddr = &tw->tw_rcv_saddr; 560 entry.daddr = &tw->tw_daddr; 561 } 562 entry.sport = tw->tw_num; 563 entry.dport = ntohs(tw->tw_dport); 564 entry.userlocks = 0; 565 566 if (!inet_diag_bc_run(nla_data(bc), nla_len(bc), &entry)) 567 return 0; 568 } 569 570 return inet_twsk_diag_fill(tw, skb, r->idiag_ext, 571 NETLINK_CB(cb->skb).pid, 572 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 573 } 574 575 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk, 576 struct request_sock *req, u32 pid, u32 seq, 577 const struct nlmsghdr *unlh) 578 { 579 const struct inet_request_sock *ireq = inet_rsk(req); 580 struct inet_sock *inet = inet_sk(sk); 581 unsigned char *b = skb_tail_pointer(skb); 582 struct inet_diag_msg *r; 583 struct nlmsghdr *nlh; 584 long tmo; 585 586 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); 587 nlh->nlmsg_flags = NLM_F_MULTI; 588 r = NLMSG_DATA(nlh); 589 590 r->idiag_family = sk->sk_family; 591 r->idiag_state = TCP_SYN_RECV; 592 r->idiag_timer = 1; 593 r->idiag_retrans = req->retrans; 594 595 r->id.idiag_if = sk->sk_bound_dev_if; 596 r->id.idiag_cookie[0] = (u32)(unsigned long)req; 597 r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1); 598 599 tmo = req->expires - jiffies; 600 if (tmo < 0) 601 tmo = 0; 602 603 r->id.idiag_sport = inet->inet_sport; 604 r->id.idiag_dport = ireq->rmt_port; 605 r->id.idiag_src[0] = ireq->loc_addr; 606 r->id.idiag_dst[0] = ireq->rmt_addr; 607 r->idiag_expires = jiffies_to_msecs(tmo); 608 r->idiag_rqueue = 0; 609 r->idiag_wqueue = 0; 610 r->idiag_uid = sock_i_uid(sk); 611 r->idiag_inode = 0; 612 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 613 if (r->idiag_family == AF_INET6) { 614 *(struct in6_addr *)r->id.idiag_src = inet6_rsk(req)->loc_addr; 615 *(struct in6_addr *)r->id.idiag_dst = inet6_rsk(req)->rmt_addr; 616 } 617 #endif 618 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 619 620 return skb->len; 621 622 nlmsg_failure: 623 nlmsg_trim(skb, b); 624 return -1; 625 } 626 627 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk, 628 struct netlink_callback *cb, 629 const struct nlattr *bc) 630 { 631 struct inet_diag_entry entry; 632 struct inet_diag_req_compat *r = NLMSG_DATA(cb->nlh); 633 struct inet_connection_sock *icsk = inet_csk(sk); 634 struct listen_sock *lopt; 635 struct inet_sock *inet = inet_sk(sk); 636 int j, s_j; 637 int reqnum, s_reqnum; 638 int err = 0; 639 640 s_j = cb->args[3]; 641 s_reqnum = cb->args[4]; 642 643 if (s_j > 0) 644 s_j--; 645 646 entry.family = sk->sk_family; 647 648 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 649 650 lopt = icsk->icsk_accept_queue.listen_opt; 651 if (!lopt || !lopt->qlen) 652 goto out; 653 654 if (bc != NULL) { 655 entry.sport = inet->inet_num; 656 entry.userlocks = sk->sk_userlocks; 657 } 658 659 for (j = s_j; j < lopt->nr_table_entries; j++) { 660 struct request_sock *req, *head = lopt->syn_table[j]; 661 662 reqnum = 0; 663 for (req = head; req; reqnum++, req = req->dl_next) { 664 struct inet_request_sock *ireq = inet_rsk(req); 665 666 if (reqnum < s_reqnum) 667 continue; 668 if (r->id.idiag_dport != ireq->rmt_port && 669 r->id.idiag_dport) 670 continue; 671 672 if (bc) { 673 entry.saddr = 674 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 675 (entry.family == AF_INET6) ? 676 inet6_rsk(req)->loc_addr.s6_addr32 : 677 #endif 678 &ireq->loc_addr; 679 entry.daddr = 680 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 681 (entry.family == AF_INET6) ? 682 inet6_rsk(req)->rmt_addr.s6_addr32 : 683 #endif 684 &ireq->rmt_addr; 685 entry.dport = ntohs(ireq->rmt_port); 686 687 if (!inet_diag_bc_run(nla_data(bc), 688 nla_len(bc), &entry)) 689 continue; 690 } 691 692 err = inet_diag_fill_req(skb, sk, req, 693 NETLINK_CB(cb->skb).pid, 694 cb->nlh->nlmsg_seq, cb->nlh); 695 if (err < 0) { 696 cb->args[3] = j + 1; 697 cb->args[4] = reqnum; 698 goto out; 699 } 700 } 701 702 s_reqnum = 0; 703 } 704 705 out: 706 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 707 708 return err; 709 } 710 711 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) 712 { 713 int i, num; 714 int s_i, s_num; 715 struct inet_diag_req_compat *r = NLMSG_DATA(cb->nlh); 716 const struct inet_diag_handler *handler; 717 struct inet_hashinfo *hashinfo; 718 const struct nlattr *bc = NULL; 719 720 if (nlmsg_attrlen(cb->nlh, sizeof(struct inet_diag_req_compat))) 721 bc = nlmsg_find_attr(cb->nlh, sizeof(*r), INET_DIAG_REQ_BYTECODE); 722 723 handler = inet_diag_lock_handler(inet_diag_type2proto(cb->nlh->nlmsg_type)); 724 if (IS_ERR(handler)) 725 goto unlock; 726 727 hashinfo = handler->idiag_hashinfo; 728 729 s_i = cb->args[1]; 730 s_num = num = cb->args[2]; 731 732 if (cb->args[0] == 0) { 733 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV))) 734 goto skip_listen_ht; 735 736 for (i = s_i; i < INET_LHTABLE_SIZE; i++) { 737 struct sock *sk; 738 struct hlist_nulls_node *node; 739 struct inet_listen_hashbucket *ilb; 740 741 num = 0; 742 ilb = &hashinfo->listening_hash[i]; 743 spin_lock_bh(&ilb->lock); 744 sk_nulls_for_each(sk, node, &ilb->head) { 745 struct inet_sock *inet = inet_sk(sk); 746 747 if (num < s_num) { 748 num++; 749 continue; 750 } 751 752 if (r->id.idiag_sport != inet->inet_sport && 753 r->id.idiag_sport) 754 goto next_listen; 755 756 if (!(r->idiag_states & TCPF_LISTEN) || 757 r->id.idiag_dport || 758 cb->args[3] > 0) 759 goto syn_recv; 760 761 if (inet_csk_diag_dump(sk, skb, cb, bc) < 0) { 762 spin_unlock_bh(&ilb->lock); 763 goto done; 764 } 765 766 syn_recv: 767 if (!(r->idiag_states & TCPF_SYN_RECV)) 768 goto next_listen; 769 770 if (inet_diag_dump_reqs(skb, sk, cb, bc) < 0) { 771 spin_unlock_bh(&ilb->lock); 772 goto done; 773 } 774 775 next_listen: 776 cb->args[3] = 0; 777 cb->args[4] = 0; 778 ++num; 779 } 780 spin_unlock_bh(&ilb->lock); 781 782 s_num = 0; 783 cb->args[3] = 0; 784 cb->args[4] = 0; 785 } 786 skip_listen_ht: 787 cb->args[0] = 1; 788 s_i = num = s_num = 0; 789 } 790 791 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV))) 792 goto unlock; 793 794 for (i = s_i; i <= hashinfo->ehash_mask; i++) { 795 struct inet_ehash_bucket *head = &hashinfo->ehash[i]; 796 spinlock_t *lock = inet_ehash_lockp(hashinfo, i); 797 struct sock *sk; 798 struct hlist_nulls_node *node; 799 800 num = 0; 801 802 if (hlist_nulls_empty(&head->chain) && 803 hlist_nulls_empty(&head->twchain)) 804 continue; 805 806 if (i > s_i) 807 s_num = 0; 808 809 spin_lock_bh(lock); 810 sk_nulls_for_each(sk, node, &head->chain) { 811 struct inet_sock *inet = inet_sk(sk); 812 813 if (num < s_num) 814 goto next_normal; 815 if (!(r->idiag_states & (1 << sk->sk_state))) 816 goto next_normal; 817 if (r->id.idiag_sport != inet->inet_sport && 818 r->id.idiag_sport) 819 goto next_normal; 820 if (r->id.idiag_dport != inet->inet_dport && 821 r->id.idiag_dport) 822 goto next_normal; 823 if (inet_csk_diag_dump(sk, skb, cb, bc) < 0) { 824 spin_unlock_bh(lock); 825 goto done; 826 } 827 next_normal: 828 ++num; 829 } 830 831 if (r->idiag_states & TCPF_TIME_WAIT) { 832 struct inet_timewait_sock *tw; 833 834 inet_twsk_for_each(tw, node, 835 &head->twchain) { 836 837 if (num < s_num) 838 goto next_dying; 839 if (r->id.idiag_sport != tw->tw_sport && 840 r->id.idiag_sport) 841 goto next_dying; 842 if (r->id.idiag_dport != tw->tw_dport && 843 r->id.idiag_dport) 844 goto next_dying; 845 if (inet_twsk_diag_dump(tw, skb, cb, bc) < 0) { 846 spin_unlock_bh(lock); 847 goto done; 848 } 849 next_dying: 850 ++num; 851 } 852 } 853 spin_unlock_bh(lock); 854 } 855 856 done: 857 cb->args[1] = i; 858 cb->args[2] = num; 859 unlock: 860 inet_diag_unlock_handler(handler); 861 return skb->len; 862 } 863 864 static int inet_diag_get_exact_compat(struct sk_buff *in_skb, 865 const struct nlmsghdr *nlh) 866 { 867 struct inet_diag_req_compat *rc = NLMSG_DATA(nlh); 868 struct inet_diag_req req; 869 870 req.sdiag_family = rc->idiag_family; 871 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type); 872 req.idiag_ext = rc->idiag_ext; 873 req.idiag_states = rc->idiag_states; 874 req.id = rc->id; 875 876 return inet_diag_get_exact(in_skb, nlh, &req); 877 } 878 879 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh) 880 { 881 int hdrlen = sizeof(struct inet_diag_req_compat); 882 883 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX || 884 nlmsg_len(nlh) < hdrlen) 885 return -EINVAL; 886 887 if (nlh->nlmsg_flags & NLM_F_DUMP) { 888 if (nlmsg_attrlen(nlh, hdrlen)) { 889 struct nlattr *attr; 890 891 attr = nlmsg_find_attr(nlh, hdrlen, 892 INET_DIAG_REQ_BYTECODE); 893 if (attr == NULL || 894 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 895 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 896 return -EINVAL; 897 } 898 899 return netlink_dump_start(sdiagnl, skb, nlh, 900 inet_diag_dump, NULL, 0); 901 } 902 903 return inet_diag_get_exact_compat(skb, nlh); 904 } 905 906 static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h) 907 { 908 int hdrlen = sizeof(struct inet_diag_req); 909 910 if (nlmsg_len(h) < hdrlen) 911 return -EINVAL; 912 913 if (h->nlmsg_flags & NLM_F_DUMP) { 914 return -EAFNOSUPPORT; 915 } 916 917 return inet_diag_get_exact(skb, h, (struct inet_diag_req *)NLMSG_DATA(h)); 918 } 919 920 static struct sock_diag_handler inet_diag_handler = { 921 .family = AF_INET, 922 .dump = inet_diag_handler_dump, 923 }; 924 925 static struct sock_diag_handler inet6_diag_handler = { 926 .family = AF_INET6, 927 .dump = inet_diag_handler_dump, 928 }; 929 930 static struct sock_diag_handler *sock_diag_handlers[AF_MAX]; 931 static DEFINE_MUTEX(sock_diag_table_mutex); 932 933 int sock_diag_register(struct sock_diag_handler *hndl) 934 { 935 int err = 0; 936 937 if (hndl->family > AF_MAX) 938 return -EINVAL; 939 940 mutex_lock(&sock_diag_table_mutex); 941 if (sock_diag_handlers[hndl->family]) 942 err = -EBUSY; 943 else 944 sock_diag_handlers[hndl->family] = hndl; 945 mutex_unlock(&sock_diag_table_mutex); 946 947 return err; 948 } 949 950 void sock_diag_unregister(struct sock_diag_handler *hnld) 951 { 952 int family = hnld->family; 953 954 if (family > AF_MAX) 955 return; 956 957 mutex_lock(&sock_diag_table_mutex); 958 BUG_ON(sock_diag_handlers[family] != hnld); 959 sock_diag_handlers[family] = NULL; 960 mutex_unlock(&sock_diag_table_mutex); 961 } 962 963 static inline struct sock_diag_handler *sock_diag_lock_handler(int family) 964 { 965 mutex_lock(&sock_diag_table_mutex); 966 return sock_diag_handlers[family]; 967 } 968 969 static inline void sock_diag_unlock_handler(struct sock_diag_handler *h) 970 { 971 mutex_unlock(&sock_diag_table_mutex); 972 } 973 974 static int __sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 975 { 976 int err; 977 struct sock_diag_req *req = NLMSG_DATA(nlh); 978 struct sock_diag_handler *hndl; 979 980 if (nlmsg_len(nlh) < sizeof(*req)) 981 return -EINVAL; 982 983 hndl = sock_diag_lock_handler(req->sdiag_family); 984 if (hndl == NULL) 985 err = -ENOENT; 986 else 987 err = hndl->dump(skb, nlh); 988 sock_diag_unlock_handler(hndl); 989 990 return err; 991 } 992 993 static int sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 994 { 995 switch (nlh->nlmsg_type) { 996 case TCPDIAG_GETSOCK: 997 case DCCPDIAG_GETSOCK: 998 return inet_diag_rcv_msg_compat(skb, nlh); 999 case SOCK_DIAG_BY_FAMILY: 1000 return __sock_diag_rcv_msg(skb, nlh); 1001 default: 1002 return -EINVAL; 1003 } 1004 } 1005 1006 static DEFINE_MUTEX(sock_diag_mutex); 1007 1008 static void sock_diag_rcv(struct sk_buff *skb) 1009 { 1010 mutex_lock(&sock_diag_mutex); 1011 netlink_rcv_skb(skb, &sock_diag_rcv_msg); 1012 mutex_unlock(&sock_diag_mutex); 1013 } 1014 1015 int inet_diag_register(const struct inet_diag_handler *h) 1016 { 1017 const __u16 type = h->idiag_type; 1018 int err = -EINVAL; 1019 1020 if (type >= IPPROTO_MAX) 1021 goto out; 1022 1023 mutex_lock(&inet_diag_table_mutex); 1024 err = -EEXIST; 1025 if (inet_diag_table[type] == NULL) { 1026 inet_diag_table[type] = h; 1027 err = 0; 1028 } 1029 mutex_unlock(&inet_diag_table_mutex); 1030 out: 1031 return err; 1032 } 1033 EXPORT_SYMBOL_GPL(inet_diag_register); 1034 1035 void inet_diag_unregister(const struct inet_diag_handler *h) 1036 { 1037 const __u16 type = h->idiag_type; 1038 1039 if (type >= IPPROTO_MAX) 1040 return; 1041 1042 mutex_lock(&inet_diag_table_mutex); 1043 inet_diag_table[type] = NULL; 1044 mutex_unlock(&inet_diag_table_mutex); 1045 } 1046 EXPORT_SYMBOL_GPL(inet_diag_unregister); 1047 1048 static int __init inet_diag_init(void) 1049 { 1050 const int inet_diag_table_size = (IPPROTO_MAX * 1051 sizeof(struct inet_diag_handler *)); 1052 int err = -ENOMEM; 1053 1054 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL); 1055 if (!inet_diag_table) 1056 goto out; 1057 1058 sdiagnl = netlink_kernel_create(&init_net, NETLINK_SOCK_DIAG, 0, 1059 sock_diag_rcv, NULL, THIS_MODULE); 1060 if (sdiagnl == NULL) 1061 goto out_free_table; 1062 1063 err = sock_diag_register(&inet_diag_handler); 1064 if (err) 1065 goto out_free_nl; 1066 1067 err = sock_diag_register(&inet6_diag_handler); 1068 if (err) 1069 goto out_free_inet; 1070 1071 out: 1072 return err; 1073 1074 out_free_inet: 1075 sock_diag_unregister(&inet_diag_handler); 1076 out_free_nl: 1077 netlink_kernel_release(sdiagnl); 1078 out_free_table: 1079 kfree(inet_diag_table); 1080 goto out; 1081 } 1082 1083 static void __exit inet_diag_exit(void) 1084 { 1085 sock_diag_unregister(&inet6_diag_handler); 1086 sock_diag_unregister(&inet_diag_handler); 1087 netlink_kernel_release(sdiagnl); 1088 kfree(inet_diag_table); 1089 } 1090 1091 module_init(inet_diag_init); 1092 module_exit(inet_diag_exit); 1093 MODULE_LICENSE("GPL"); 1094 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_SOCK_DIAG); 1095