1/* 2 * inet_diag.c Module for monitoring INET transport protocols sockets. 3 * 4 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11 12#include <linux/kernel.h> 13#include <linux/module.h> 14#include <linux/types.h> 15#include <linux/fcntl.h> 16#include <linux/random.h> 17#include <linux/slab.h> 18#include <linux/cache.h> 19#include <linux/init.h> 20#include <linux/time.h> 21 22#include <net/icmp.h> 23#include <net/tcp.h> 24#include <net/ipv6.h> 25#include <net/inet_common.h> 26#include <net/inet_connection_sock.h> 27#include <net/inet_hashtables.h> 28#include <net/inet_timewait_sock.h> 29#include <net/inet6_hashtables.h> 30#include <net/netlink.h> 31 32#include <linux/inet.h> 33#include <linux/stddef.h> 34 35#include <linux/inet_diag.h> 36 37static const struct inet_diag_handler **inet_diag_table; 38 39struct inet_diag_entry { 40 __be32 *saddr; 41 __be32 *daddr; 42 u16 sport; 43 u16 dport; 44 u16 family; 45 u16 userlocks; 46}; 47 48static struct sock *idiagnl; 49 50#define INET_DIAG_PUT(skb, attrtype, attrlen) \ 51 RTA_DATA(__RTA_PUT(skb, attrtype, attrlen)) 52 53static DEFINE_MUTEX(inet_diag_table_mutex); 54 55static const struct inet_diag_handler *inet_diag_lock_handler(int type) 56{ 57 if (!inet_diag_table[type]) 58 request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK, 59 NETLINK_INET_DIAG, type); 60 61 mutex_lock(&inet_diag_table_mutex); 62 if (!inet_diag_table[type]) 63 return ERR_PTR(-ENOENT); 64 65 return inet_diag_table[type]; 66} 67 68static inline void inet_diag_unlock_handler( 69 const struct inet_diag_handler *handler) 70{ 71 mutex_unlock(&inet_diag_table_mutex); 72} 73 74static int inet_csk_diag_fill(struct sock *sk, 75 struct sk_buff *skb, 76 int ext, u32 pid, u32 seq, u16 nlmsg_flags, 77 const struct nlmsghdr *unlh) 78{ 79 const struct inet_sock *inet = inet_sk(sk); 80 const struct inet_connection_sock *icsk = inet_csk(sk); 81 struct inet_diag_msg *r; 82 struct nlmsghdr *nlh; 83 void *info = NULL; 84 struct inet_diag_meminfo *minfo = NULL; 85 unsigned char *b = skb_tail_pointer(skb); 86 const struct inet_diag_handler *handler; 87 88 handler = inet_diag_table[unlh->nlmsg_type]; 89 BUG_ON(handler == NULL); 90 91 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); 92 nlh->nlmsg_flags = nlmsg_flags; 93 94 r = NLMSG_DATA(nlh); 95 BUG_ON(sk->sk_state == TCP_TIME_WAIT); 96 97 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) 98 minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo)); 99 100 if (ext & (1 << (INET_DIAG_INFO - 1))) 101 info = INET_DIAG_PUT(skb, INET_DIAG_INFO, 102 handler->idiag_info_size); 103 104 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) { 105 const size_t len = strlen(icsk->icsk_ca_ops->name); 106 107 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1), 108 icsk->icsk_ca_ops->name); 109 } 110 111 r->idiag_family = sk->sk_family; 112 r->idiag_state = sk->sk_state; 113 r->idiag_timer = 0; 114 r->idiag_retrans = 0; 115 116 r->id.idiag_if = sk->sk_bound_dev_if; 117 r->id.idiag_cookie[0] = (u32)(unsigned long)sk; 118 r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1); 119 120 r->id.idiag_sport = inet->inet_sport; 121 r->id.idiag_dport = inet->inet_dport; 122 r->id.idiag_src[0] = inet->inet_rcv_saddr; 123 r->id.idiag_dst[0] = inet->inet_daddr; 124 125#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 126 if (r->idiag_family == AF_INET6) { 127 struct ipv6_pinfo *np = inet6_sk(sk); 128 129 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, 130 &np->rcv_saddr); 131 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, 132 &np->daddr); 133 } 134#endif 135 136#define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ) 137 138 if (icsk->icsk_pending == ICSK_TIME_RETRANS) { 139 r->idiag_timer = 1; 140 r->idiag_retrans = icsk->icsk_retransmits; 141 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 142 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { 143 r->idiag_timer = 4; 144 r->idiag_retrans = icsk->icsk_probes_out; 145 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout); 146 } else if (timer_pending(&sk->sk_timer)) { 147 r->idiag_timer = 2; 148 r->idiag_retrans = icsk->icsk_probes_out; 149 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires); 150 } else { 151 r->idiag_timer = 0; 152 r->idiag_expires = 0; 153 } 154#undef EXPIRES_IN_MS 155 156 r->idiag_uid = sock_i_uid(sk); 157 r->idiag_inode = sock_i_ino(sk); 158 159 if (minfo) { 160 minfo->idiag_rmem = sk_rmem_alloc_get(sk); 161 minfo->idiag_wmem = sk->sk_wmem_queued; 162 minfo->idiag_fmem = sk->sk_forward_alloc; 163 minfo->idiag_tmem = sk_wmem_alloc_get(sk); 164 } 165 166 handler->idiag_get_info(sk, r, info); 167 168 if (sk->sk_state < TCP_TIME_WAIT && 169 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info) 170 icsk->icsk_ca_ops->get_info(sk, ext, skb); 171 172 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 173 return skb->len; 174 175rtattr_failure: 176nlmsg_failure: 177 nlmsg_trim(skb, b); 178 return -EMSGSIZE; 179} 180 181static int inet_twsk_diag_fill(struct inet_timewait_sock *tw, 182 struct sk_buff *skb, int ext, u32 pid, 183 u32 seq, u16 nlmsg_flags, 184 const struct nlmsghdr *unlh) 185{ 186 long tmo; 187 struct inet_diag_msg *r; 188 const unsigned char *previous_tail = skb_tail_pointer(skb); 189 struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq, 190 unlh->nlmsg_type, sizeof(*r)); 191 192 r = NLMSG_DATA(nlh); 193 BUG_ON(tw->tw_state != TCP_TIME_WAIT); 194 195 nlh->nlmsg_flags = nlmsg_flags; 196 197 tmo = tw->tw_ttd - jiffies; 198 if (tmo < 0) 199 tmo = 0; 200 201 r->idiag_family = tw->tw_family; 202 r->idiag_retrans = 0; 203 r->id.idiag_if = tw->tw_bound_dev_if; 204 r->id.idiag_cookie[0] = (u32)(unsigned long)tw; 205 r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1); 206 r->id.idiag_sport = tw->tw_sport; 207 r->id.idiag_dport = tw->tw_dport; 208 r->id.idiag_src[0] = tw->tw_rcv_saddr; 209 r->id.idiag_dst[0] = tw->tw_daddr; 210 r->idiag_state = tw->tw_substate; 211 r->idiag_timer = 3; 212 r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ); 213 r->idiag_rqueue = 0; 214 r->idiag_wqueue = 0; 215 r->idiag_uid = 0; 216 r->idiag_inode = 0; 217#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 218 if (tw->tw_family == AF_INET6) { 219 const struct inet6_timewait_sock *tw6 = 220 inet6_twsk((struct sock *)tw); 221 222 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, 223 &tw6->tw_v6_rcv_saddr); 224 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, 225 &tw6->tw_v6_daddr); 226 } 227#endif 228 nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail; 229 return skb->len; 230nlmsg_failure: 231 nlmsg_trim(skb, previous_tail); 232 return -EMSGSIZE; 233} 234 235static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, 236 int ext, u32 pid, u32 seq, u16 nlmsg_flags, 237 const struct nlmsghdr *unlh) 238{ 239 if (sk->sk_state == TCP_TIME_WAIT) 240 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk, 241 skb, ext, pid, seq, nlmsg_flags, 242 unlh); 243 return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh); 244} 245 246static int inet_diag_get_exact(struct sk_buff *in_skb, 247 const struct nlmsghdr *nlh) 248{ 249 int err; 250 struct sock *sk; 251 struct inet_diag_req *req = NLMSG_DATA(nlh); 252 struct sk_buff *rep; 253 struct inet_hashinfo *hashinfo; 254 const struct inet_diag_handler *handler; 255 256 handler = inet_diag_lock_handler(nlh->nlmsg_type); 257 if (IS_ERR(handler)) { 258 err = PTR_ERR(handler); 259 goto unlock; 260 } 261 262 hashinfo = handler->idiag_hashinfo; 263 err = -EINVAL; 264 265 if (req->idiag_family == AF_INET) { 266 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0], 267 req->id.idiag_dport, req->id.idiag_src[0], 268 req->id.idiag_sport, req->id.idiag_if); 269 } 270#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 271 else if (req->idiag_family == AF_INET6) { 272 sk = inet6_lookup(&init_net, hashinfo, 273 (struct in6_addr *)req->id.idiag_dst, 274 req->id.idiag_dport, 275 (struct in6_addr *)req->id.idiag_src, 276 req->id.idiag_sport, 277 req->id.idiag_if); 278 } 279#endif 280 else { 281 goto unlock; 282 } 283 284 err = -ENOENT; 285 if (sk == NULL) 286 goto unlock; 287 288 err = -ESTALE; 289 if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE || 290 req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) && 291 ((u32)(unsigned long)sk != req->id.idiag_cookie[0] || 292 (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1])) 293 goto out; 294 295 err = -ENOMEM; 296 rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) + 297 sizeof(struct inet_diag_meminfo) + 298 handler->idiag_info_size + 64)), 299 GFP_KERNEL); 300 if (!rep) 301 goto out; 302 303 err = sk_diag_fill(sk, rep, req->idiag_ext, 304 NETLINK_CB(in_skb).pid, 305 nlh->nlmsg_seq, 0, nlh); 306 if (err < 0) { 307 WARN_ON(err == -EMSGSIZE); 308 kfree_skb(rep); 309 goto out; 310 } 311 err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid, 312 MSG_DONTWAIT); 313 if (err > 0) 314 err = 0; 315 316out: 317 if (sk) { 318 if (sk->sk_state == TCP_TIME_WAIT) 319 inet_twsk_put((struct inet_timewait_sock *)sk); 320 else 321 sock_put(sk); 322 } 323unlock: 324 inet_diag_unlock_handler(handler); 325 return err; 326} 327 328static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits) 329{ 330 int words = bits >> 5; 331 332 bits &= 0x1f; 333 334 if (words) { 335 if (memcmp(a1, a2, words << 2)) 336 return 0; 337 } 338 if (bits) { 339 __be32 w1, w2; 340 __be32 mask; 341 342 w1 = a1[words]; 343 w2 = a2[words]; 344 345 mask = htonl((0xffffffff) << (32 - bits)); 346 347 if ((w1 ^ w2) & mask) 348 return 0; 349 } 350 351 return 1; 352} 353 354 355static int inet_diag_bc_run(const void *bc, int len, 356 const struct inet_diag_entry *entry) 357{ 358 while (len > 0) { 359 int yes = 1; 360 const struct inet_diag_bc_op *op = bc; 361 362 switch (op->code) { 363 case INET_DIAG_BC_NOP: 364 break; 365 case INET_DIAG_BC_JMP: 366 yes = 0; 367 break; 368 case INET_DIAG_BC_S_GE: 369 yes = entry->sport >= op[1].no; 370 break; 371 case INET_DIAG_BC_S_LE: 372 yes = entry->sport <= op[1].no; 373 break; 374 case INET_DIAG_BC_D_GE: 375 yes = entry->dport >= op[1].no; 376 break; 377 case INET_DIAG_BC_D_LE: 378 yes = entry->dport <= op[1].no; 379 break; 380 case INET_DIAG_BC_AUTO: 381 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); 382 break; 383 case INET_DIAG_BC_S_COND: 384 case INET_DIAG_BC_D_COND: { 385 struct inet_diag_hostcond *cond; 386 __be32 *addr; 387 388 cond = (struct inet_diag_hostcond *)(op + 1); 389 if (cond->port != -1 && 390 cond->port != (op->code == INET_DIAG_BC_S_COND ? 391 entry->sport : entry->dport)) { 392 yes = 0; 393 break; 394 } 395 396 if (cond->prefix_len == 0) 397 break; 398 399 if (op->code == INET_DIAG_BC_S_COND) 400 addr = entry->saddr; 401 else 402 addr = entry->daddr; 403 404 if (bitstring_match(addr, cond->addr, 405 cond->prefix_len)) 406 break; 407 if (entry->family == AF_INET6 && 408 cond->family == AF_INET) { 409 if (addr[0] == 0 && addr[1] == 0 && 410 addr[2] == htonl(0xffff) && 411 bitstring_match(addr + 3, cond->addr, 412 cond->prefix_len)) 413 break; 414 } 415 yes = 0; 416 break; 417 } 418 } 419 420 if (yes) { 421 len -= op->yes; 422 bc += op->yes; 423 } else { 424 len -= op->no; 425 bc += op->no; 426 } 427 } 428 return (len == 0); 429} 430 431static int valid_cc(const void *bc, int len, int cc) 432{ 433 while (len >= 0) { 434 const struct inet_diag_bc_op *op = bc; 435 436 if (cc > len) 437 return 0; 438 if (cc == len) 439 return 1; 440 if (op->yes < 4) 441 return 0; 442 len -= op->yes; 443 bc += op->yes; 444 } 445 return 0; 446} 447 448static int inet_diag_bc_audit(const void *bytecode, int bytecode_len) 449{ 450 const unsigned char *bc = bytecode; 451 int len = bytecode_len; 452 453 while (len > 0) { 454 struct inet_diag_bc_op *op = (struct inet_diag_bc_op *)bc; 455 456//printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len); 457 switch (op->code) { 458 case INET_DIAG_BC_AUTO: 459 case INET_DIAG_BC_S_COND: 460 case INET_DIAG_BC_D_COND: 461 case INET_DIAG_BC_S_GE: 462 case INET_DIAG_BC_S_LE: 463 case INET_DIAG_BC_D_GE: 464 case INET_DIAG_BC_D_LE: 465 if (op->yes < 4 || op->yes > len + 4) 466 return -EINVAL; 467 case INET_DIAG_BC_JMP: 468 if (op->no < 4 || op->no > len + 4) 469 return -EINVAL; 470 if (op->no < len && 471 !valid_cc(bytecode, bytecode_len, len - op->no)) 472 return -EINVAL; 473 break; 474 case INET_DIAG_BC_NOP: 475 if (op->yes < 4 || op->yes > len + 4) 476 return -EINVAL; 477 break; 478 default: 479 return -EINVAL; 480 } 481 bc += op->yes; 482 len -= op->yes; 483 } 484 return len == 0 ? 0 : -EINVAL; 485} 486 487static int inet_csk_diag_dump(struct sock *sk, 488 struct sk_buff *skb, 489 struct netlink_callback *cb) 490{ 491 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 492 493 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { 494 struct inet_diag_entry entry; 495 struct rtattr *bc = (struct rtattr *)(r + 1); 496 struct inet_sock *inet = inet_sk(sk); 497 498 entry.family = sk->sk_family; 499#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 500 if (entry.family == AF_INET6) { 501 struct ipv6_pinfo *np = inet6_sk(sk); 502 503 entry.saddr = np->rcv_saddr.s6_addr32; 504 entry.daddr = np->daddr.s6_addr32; 505 } else 506#endif 507 { 508 entry.saddr = &inet->inet_rcv_saddr; 509 entry.daddr = &inet->inet_daddr; 510 } 511 entry.sport = inet->inet_num; 512 entry.dport = ntohs(inet->inet_dport); 513 entry.userlocks = sk->sk_userlocks; 514 515 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry)) 516 return 0; 517 } 518 519 return inet_csk_diag_fill(sk, skb, r->idiag_ext, 520 NETLINK_CB(cb->skb).pid, 521 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 522} 523 524static int inet_twsk_diag_dump(struct inet_timewait_sock *tw, 525 struct sk_buff *skb, 526 struct netlink_callback *cb) 527{ 528 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 529 530 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { 531 struct inet_diag_entry entry; 532 struct rtattr *bc = (struct rtattr *)(r + 1); 533 534 entry.family = tw->tw_family; 535#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 536 if (tw->tw_family == AF_INET6) { 537 struct inet6_timewait_sock *tw6 = 538 inet6_twsk((struct sock *)tw); 539 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32; 540 entry.daddr = tw6->tw_v6_daddr.s6_addr32; 541 } else 542#endif 543 { 544 entry.saddr = &tw->tw_rcv_saddr; 545 entry.daddr = &tw->tw_daddr; 546 } 547 entry.sport = tw->tw_num; 548 entry.dport = ntohs(tw->tw_dport); 549 entry.userlocks = 0; 550 551 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry)) 552 return 0; 553 } 554 555 return inet_twsk_diag_fill(tw, skb, r->idiag_ext, 556 NETLINK_CB(cb->skb).pid, 557 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 558} 559 560static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk, 561 struct request_sock *req, u32 pid, u32 seq, 562 const struct nlmsghdr *unlh) 563{ 564 const struct inet_request_sock *ireq = inet_rsk(req); 565 struct inet_sock *inet = inet_sk(sk); 566 unsigned char *b = skb_tail_pointer(skb); 567 struct inet_diag_msg *r; 568 struct nlmsghdr *nlh; 569 long tmo; 570 571 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r)); 572 nlh->nlmsg_flags = NLM_F_MULTI; 573 r = NLMSG_DATA(nlh); 574 575 r->idiag_family = sk->sk_family; 576 r->idiag_state = TCP_SYN_RECV; 577 r->idiag_timer = 1; 578 r->idiag_retrans = req->retrans; 579 580 r->id.idiag_if = sk->sk_bound_dev_if; 581 r->id.idiag_cookie[0] = (u32)(unsigned long)req; 582 r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1); 583 584 tmo = req->expires - jiffies; 585 if (tmo < 0) 586 tmo = 0; 587 588 r->id.idiag_sport = inet->inet_sport; 589 r->id.idiag_dport = ireq->rmt_port; 590 r->id.idiag_src[0] = ireq->loc_addr; 591 r->id.idiag_dst[0] = ireq->rmt_addr; 592 r->idiag_expires = jiffies_to_msecs(tmo); 593 r->idiag_rqueue = 0; 594 r->idiag_wqueue = 0; 595 r->idiag_uid = sock_i_uid(sk); 596 r->idiag_inode = 0; 597#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 598 if (r->idiag_family == AF_INET6) { 599 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src, 600 &inet6_rsk(req)->loc_addr); 601 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst, 602 &inet6_rsk(req)->rmt_addr); 603 } 604#endif 605 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 606 607 return skb->len; 608 609nlmsg_failure: 610 nlmsg_trim(skb, b); 611 return -1; 612} 613 614static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk, 615 struct netlink_callback *cb) 616{ 617 struct inet_diag_entry entry; 618 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 619 struct inet_connection_sock *icsk = inet_csk(sk); 620 struct listen_sock *lopt; 621 struct rtattr *bc = NULL; 622 struct inet_sock *inet = inet_sk(sk); 623 int j, s_j; 624 int reqnum, s_reqnum; 625 int err = 0; 626 627 s_j = cb->args[3]; 628 s_reqnum = cb->args[4]; 629 630 if (s_j > 0) 631 s_j--; 632 633 entry.family = sk->sk_family; 634 635 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 636 637 lopt = icsk->icsk_accept_queue.listen_opt; 638 if (!lopt || !lopt->qlen) 639 goto out; 640 641 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { 642 bc = (struct rtattr *)(r + 1); 643 entry.sport = inet->inet_num; 644 entry.userlocks = sk->sk_userlocks; 645 } 646 647 for (j = s_j; j < lopt->nr_table_entries; j++) { 648 struct request_sock *req, *head = lopt->syn_table[j]; 649 650 reqnum = 0; 651 for (req = head; req; reqnum++, req = req->dl_next) { 652 struct inet_request_sock *ireq = inet_rsk(req); 653 654 if (reqnum < s_reqnum) 655 continue; 656 if (r->id.idiag_dport != ireq->rmt_port && 657 r->id.idiag_dport) 658 continue; 659 660 if (bc) { 661 entry.saddr = 662#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 663 (entry.family == AF_INET6) ? 664 inet6_rsk(req)->loc_addr.s6_addr32 : 665#endif 666 &ireq->loc_addr; 667 entry.daddr = 668#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 669 (entry.family == AF_INET6) ? 670 inet6_rsk(req)->rmt_addr.s6_addr32 : 671#endif 672 &ireq->rmt_addr; 673 entry.dport = ntohs(ireq->rmt_port); 674 675 if (!inet_diag_bc_run(RTA_DATA(bc), 676 RTA_PAYLOAD(bc), &entry)) 677 continue; 678 } 679 680 err = inet_diag_fill_req(skb, sk, req, 681 NETLINK_CB(cb->skb).pid, 682 cb->nlh->nlmsg_seq, cb->nlh); 683 if (err < 0) { 684 cb->args[3] = j + 1; 685 cb->args[4] = reqnum; 686 goto out; 687 } 688 } 689 690 s_reqnum = 0; 691 } 692 693out: 694 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); 695 696 return err; 697} 698 699static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) 700{ 701 int i, num; 702 int s_i, s_num; 703 struct inet_diag_req *r = NLMSG_DATA(cb->nlh); 704 const struct inet_diag_handler *handler; 705 struct inet_hashinfo *hashinfo; 706 707 handler = inet_diag_lock_handler(cb->nlh->nlmsg_type); 708 if (IS_ERR(handler)) 709 goto unlock; 710 711 hashinfo = handler->idiag_hashinfo; 712 713 s_i = cb->args[1]; 714 s_num = num = cb->args[2]; 715 716 if (cb->args[0] == 0) { 717 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV))) 718 goto skip_listen_ht; 719 720 for (i = s_i; i < INET_LHTABLE_SIZE; i++) { 721 struct sock *sk; 722 struct hlist_nulls_node *node; 723 struct inet_listen_hashbucket *ilb; 724 725 num = 0; 726 ilb = &hashinfo->listening_hash[i]; 727 spin_lock_bh(&ilb->lock); 728 sk_nulls_for_each(sk, node, &ilb->head) { 729 struct inet_sock *inet = inet_sk(sk); 730 731 if (num < s_num) { 732 num++; 733 continue; 734 } 735 736 if (r->id.idiag_sport != inet->inet_sport && 737 r->id.idiag_sport) 738 goto next_listen; 739 740 if (!(r->idiag_states & TCPF_LISTEN) || 741 r->id.idiag_dport || 742 cb->args[3] > 0) 743 goto syn_recv; 744 745 if (inet_csk_diag_dump(sk, skb, cb) < 0) { 746 spin_unlock_bh(&ilb->lock); 747 goto done; 748 } 749 750syn_recv: 751 if (!(r->idiag_states & TCPF_SYN_RECV)) 752 goto next_listen; 753 754 if (inet_diag_dump_reqs(skb, sk, cb) < 0) { 755 spin_unlock_bh(&ilb->lock); 756 goto done; 757 } 758 759next_listen: 760 cb->args[3] = 0; 761 cb->args[4] = 0; 762 ++num; 763 } 764 spin_unlock_bh(&ilb->lock); 765 766 s_num = 0; 767 cb->args[3] = 0; 768 cb->args[4] = 0; 769 } 770skip_listen_ht: 771 cb->args[0] = 1; 772 s_i = num = s_num = 0; 773 } 774 775 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV))) 776 goto unlock; 777 778 for (i = s_i; i <= hashinfo->ehash_mask; i++) { 779 struct inet_ehash_bucket *head = &hashinfo->ehash[i]; 780 spinlock_t *lock = inet_ehash_lockp(hashinfo, i); 781 struct sock *sk; 782 struct hlist_nulls_node *node; 783 784 num = 0; 785 786 if (hlist_nulls_empty(&head->chain) && 787 hlist_nulls_empty(&head->twchain)) 788 continue; 789 790 if (i > s_i) 791 s_num = 0; 792 793 spin_lock_bh(lock); 794 sk_nulls_for_each(sk, node, &head->chain) { 795 struct inet_sock *inet = inet_sk(sk); 796 797 if (num < s_num) 798 goto next_normal; 799 if (!(r->idiag_states & (1 << sk->sk_state))) 800 goto next_normal; 801 if (r->id.idiag_sport != inet->inet_sport && 802 r->id.idiag_sport) 803 goto next_normal; 804 if (r->id.idiag_dport != inet->inet_dport && 805 r->id.idiag_dport) 806 goto next_normal; 807 if (inet_csk_diag_dump(sk, skb, cb) < 0) { 808 spin_unlock_bh(lock); 809 goto done; 810 } 811next_normal: 812 ++num; 813 } 814 815 if (r->idiag_states & TCPF_TIME_WAIT) { 816 struct inet_timewait_sock *tw; 817 818 inet_twsk_for_each(tw, node, 819 &head->twchain) { 820 821 if (num < s_num) 822 goto next_dying; 823 if (r->id.idiag_sport != tw->tw_sport && 824 r->id.idiag_sport) 825 goto next_dying; 826 if (r->id.idiag_dport != tw->tw_dport && 827 r->id.idiag_dport) 828 goto next_dying; 829 if (inet_twsk_diag_dump(tw, skb, cb) < 0) { 830 spin_unlock_bh(lock); 831 goto done; 832 } 833next_dying: 834 ++num; 835 } 836 } 837 spin_unlock_bh(lock); 838 } 839 840done: 841 cb->args[1] = i; 842 cb->args[2] = num; 843unlock: 844 inet_diag_unlock_handler(handler); 845 return skb->len; 846} 847 848static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 849{ 850 int hdrlen = sizeof(struct inet_diag_req); 851 852 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX || 853 nlmsg_len(nlh) < hdrlen) 854 return -EINVAL; 855 856 if (nlh->nlmsg_flags & NLM_F_DUMP) { 857 if (nlmsg_attrlen(nlh, hdrlen)) { 858 struct nlattr *attr; 859 860 attr = nlmsg_find_attr(nlh, hdrlen, 861 INET_DIAG_REQ_BYTECODE); 862 if (attr == NULL || 863 nla_len(attr) < sizeof(struct inet_diag_bc_op) || 864 inet_diag_bc_audit(nla_data(attr), nla_len(attr))) 865 return -EINVAL; 866 } 867 868 return netlink_dump_start(idiagnl, skb, nlh, 869 inet_diag_dump, NULL); 870 } 871 872 return inet_diag_get_exact(skb, nlh); 873} 874 875static DEFINE_MUTEX(inet_diag_mutex); 876 877static void inet_diag_rcv(struct sk_buff *skb) 878{ 879 mutex_lock(&inet_diag_mutex); 880 netlink_rcv_skb(skb, &inet_diag_rcv_msg); 881 mutex_unlock(&inet_diag_mutex); 882} 883 884int inet_diag_register(const struct inet_diag_handler *h) 885{ 886 const __u16 type = h->idiag_type; 887 int err = -EINVAL; 888 889 if (type >= INET_DIAG_GETSOCK_MAX) 890 goto out; 891 892 mutex_lock(&inet_diag_table_mutex); 893 err = -EEXIST; 894 if (inet_diag_table[type] == NULL) { 895 inet_diag_table[type] = h; 896 err = 0; 897 } 898 mutex_unlock(&inet_diag_table_mutex); 899out: 900 return err; 901} 902EXPORT_SYMBOL_GPL(inet_diag_register); 903 904void inet_diag_unregister(const struct inet_diag_handler *h) 905{ 906 const __u16 type = h->idiag_type; 907 908 if (type >= INET_DIAG_GETSOCK_MAX) 909 return; 910 911 mutex_lock(&inet_diag_table_mutex); 912 inet_diag_table[type] = NULL; 913 mutex_unlock(&inet_diag_table_mutex); 914} 915EXPORT_SYMBOL_GPL(inet_diag_unregister); 916 917static int __init inet_diag_init(void) 918{ 919 const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX * 920 sizeof(struct inet_diag_handler *)); 921 int err = -ENOMEM; 922 923 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL); 924 if (!inet_diag_table) 925 goto out; 926 927 idiagnl = netlink_kernel_create(&init_net, NETLINK_INET_DIAG, 0, 928 inet_diag_rcv, NULL, THIS_MODULE); 929 if (idiagnl == NULL) 930 goto out_free_table; 931 err = 0; 932out: 933 return err; 934out_free_table: 935 kfree(inet_diag_table); 936 goto out; 937} 938 939static void __exit inet_diag_exit(void) 940{ 941 netlink_kernel_release(idiagnl); 942 kfree(inet_diag_table); 943} 944 945module_init(inet_diag_init); 946module_exit(inet_diag_exit); 947MODULE_LICENSE("GPL"); 948MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_INET_DIAG); 949