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
  38static const struct inet_diag_handler **inet_diag_table;
  39
  40struct inet_diag_entry {
  41	const __be32 *saddr;
  42	const __be32 *daddr;
  43	u16 sport;
  44	u16 dport;
  45	u16 family;
  46	u16 userlocks;
 
 
 
 
 
  47};
  48
  49static DEFINE_MUTEX(inet_diag_table_mutex);
  50
  51static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
  52{
 
 
 
 
 
  53	if (!inet_diag_table[proto])
  54		request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
  55			       NETLINK_SOCK_DIAG, AF_INET, proto);
  56
  57	mutex_lock(&inet_diag_table_mutex);
  58	if (!inet_diag_table[proto])
  59		return ERR_PTR(-ENOENT);
  60
  61	return inet_diag_table[proto];
  62}
  63
  64static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
  65{
  66	mutex_unlock(&inet_diag_table_mutex);
  67}
  68
  69static void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk)
  70{
  71	r->idiag_family = sk->sk_family;
  72
  73	r->id.idiag_sport = htons(sk->sk_num);
  74	r->id.idiag_dport = sk->sk_dport;
  75	r->id.idiag_if = sk->sk_bound_dev_if;
  76	sock_diag_save_cookie(sk, r->id.idiag_cookie);
  77
  78#if IS_ENABLED(CONFIG_IPV6)
  79	if (sk->sk_family == AF_INET6) {
  80		*(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
  81		*(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
  82	} else
  83#endif
  84	{
  85	memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
  86	memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
  87
  88	r->id.idiag_src[0] = sk->sk_rcv_saddr;
  89	r->id.idiag_dst[0] = sk->sk_daddr;
  90	}
  91}
 
  92
  93static size_t inet_sk_attr_size(void)
 
 
  94{
 
 
 
 
 
 
 
  95	return	  nla_total_size(sizeof(struct tcp_info))
  96		+ nla_total_size(1) /* INET_DIAG_SHUTDOWN */
  97		+ nla_total_size(1) /* INET_DIAG_TOS */
  98		+ nla_total_size(1) /* INET_DIAG_TCLASS */
  99		+ nla_total_size(sizeof(struct inet_diag_meminfo))
 100		+ nla_total_size(sizeof(struct inet_diag_msg))
 
 
 101		+ nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
 102		+ nla_total_size(TCP_CA_NAME_MAX)
 103		+ nla_total_size(sizeof(struct tcpvegas_info))
 
 104		+ 64;
 105}
 106
 107int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
 108		      struct sk_buff *skb, const struct inet_diag_req_v2 *req,
 109		      struct user_namespace *user_ns,
 110		      u32 portid, u32 seq, u16 nlmsg_flags,
 111		      const struct nlmsghdr *unlh)
 112{
 113	const struct inet_sock *inet = inet_sk(sk);
 114	const struct tcp_congestion_ops *ca_ops;
 115	const struct inet_diag_handler *handler;
 116	int ext = req->idiag_ext;
 117	struct inet_diag_msg *r;
 118	struct nlmsghdr  *nlh;
 119	struct nlattr *attr;
 120	void *info = NULL;
 121
 122	handler = inet_diag_table[req->sdiag_protocol];
 123	BUG_ON(!handler);
 124
 125	nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
 126			nlmsg_flags);
 127	if (!nlh)
 128		return -EMSGSIZE;
 129
 130	r = nlmsg_data(nlh);
 131	BUG_ON(!sk_fullsock(sk));
 132
 133	inet_diag_msg_common_fill(r, sk);
 134	r->idiag_state = sk->sk_state;
 135	r->idiag_timer = 0;
 136	r->idiag_retrans = 0;
 137
 138	if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
 139		goto errout;
 140
 141	/* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
 142	 * hence this needs to be included regardless of socket family.
 143	 */
 144	if (ext & (1 << (INET_DIAG_TOS - 1)))
 145		if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
 146			goto errout;
 147
 148#if IS_ENABLED(CONFIG_IPV6)
 149	if (r->idiag_family == AF_INET6) {
 150		if (ext & (1 << (INET_DIAG_TCLASS - 1)))
 151			if (nla_put_u8(skb, INET_DIAG_TCLASS,
 152				       inet6_sk(sk)->tclass) < 0)
 153				goto errout;
 154
 155		if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
 156		    nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
 157			goto errout;
 158	}
 159#endif
 160
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 161	r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
 162	r->idiag_inode = sock_i_ino(sk);
 163
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 164	if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
 165		struct inet_diag_meminfo minfo = {
 166			.idiag_rmem = sk_rmem_alloc_get(sk),
 167			.idiag_wmem = sk->sk_wmem_queued,
 168			.idiag_fmem = sk->sk_forward_alloc,
 169			.idiag_tmem = sk_wmem_alloc_get(sk),
 170		};
 171
 172		if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
 173			goto errout;
 174	}
 175
 176	if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
 177		if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
 178			goto errout;
 179
 
 
 
 
 
 
 
 
 
 180	if (!icsk) {
 181		handler->idiag_get_info(sk, r, NULL);
 182		goto out;
 183	}
 184
 185#define EXPIRES_IN_MS(tmo)  DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
 186
 187	if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
 188	    icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
 189	    icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
 190		r->idiag_timer = 1;
 191		r->idiag_retrans = icsk->icsk_retransmits;
 192		r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
 
 193	} else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
 194		r->idiag_timer = 4;
 195		r->idiag_retrans = icsk->icsk_probes_out;
 196		r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
 
 197	} else if (timer_pending(&sk->sk_timer)) {
 198		r->idiag_timer = 2;
 199		r->idiag_retrans = icsk->icsk_probes_out;
 200		r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
 201	} else {
 202		r->idiag_timer = 0;
 203		r->idiag_expires = 0;
 204	}
 205#undef EXPIRES_IN_MS
 206
 207	if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
 208		attr = nla_reserve(skb, INET_DIAG_INFO,
 209				   handler->idiag_info_size);
 
 210		if (!attr)
 211			goto errout;
 212
 213		info = nla_data(attr);
 214	}
 215
 216	if (ext & (1 << (INET_DIAG_CONG - 1))) {
 217		int err = 0;
 218
 219		rcu_read_lock();
 220		ca_ops = READ_ONCE(icsk->icsk_ca_ops);
 221		if (ca_ops)
 222			err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
 223		rcu_read_unlock();
 224		if (err < 0)
 225			goto errout;
 226	}
 227
 228	handler->idiag_get_info(sk, r, info);
 229
 
 
 
 
 230	if (sk->sk_state < TCP_TIME_WAIT) {
 231		union tcp_cc_info info;
 232		size_t sz = 0;
 233		int attr;
 234
 235		rcu_read_lock();
 236		ca_ops = READ_ONCE(icsk->icsk_ca_ops);
 237		if (ca_ops && ca_ops->get_info)
 238			sz = ca_ops->get_info(sk, ext, &attr, &info);
 239		rcu_read_unlock();
 240		if (sz && nla_put(skb, attr, sz, &info) < 0)
 241			goto errout;
 242	}
 243
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 244out:
 245	nlmsg_end(skb, nlh);
 246	return 0;
 247
 248errout:
 249	nlmsg_cancel(skb, nlh);
 250	return -EMSGSIZE;
 251}
 252EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
 253
 254static int inet_csk_diag_fill(struct sock *sk,
 255			      struct sk_buff *skb,
 256			      const struct inet_diag_req_v2 *req,
 257			      struct user_namespace *user_ns,
 258			      u32 portid, u32 seq, u16 nlmsg_flags,
 259			      const struct nlmsghdr *unlh)
 260{
 261	return inet_sk_diag_fill(sk, inet_csk(sk), skb, req,
 262				 user_ns, portid, seq, nlmsg_flags, unlh);
 263}
 264
 265static int inet_twsk_diag_fill(struct sock *sk,
 266			       struct sk_buff *skb,
 267			       u32 portid, u32 seq, u16 nlmsg_flags,
 268			       const struct nlmsghdr *unlh)
 269{
 270	struct inet_timewait_sock *tw = inet_twsk(sk);
 271	struct inet_diag_msg *r;
 272	struct nlmsghdr *nlh;
 273	long tmo;
 274
 275	nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
 276			nlmsg_flags);
 
 277	if (!nlh)
 278		return -EMSGSIZE;
 279
 280	r = nlmsg_data(nlh);
 281	BUG_ON(tw->tw_state != TCP_TIME_WAIT);
 282
 283	tmo = tw->tw_timer.expires - jiffies;
 284	if (tmo < 0)
 285		tmo = 0;
 286
 287	inet_diag_msg_common_fill(r, sk);
 288	r->idiag_retrans      = 0;
 289
 290	r->idiag_state	      = tw->tw_substate;
 291	r->idiag_timer	      = 3;
 292	r->idiag_expires      = jiffies_to_msecs(tmo);
 
 293	r->idiag_rqueue	      = 0;
 294	r->idiag_wqueue	      = 0;
 295	r->idiag_uid	      = 0;
 296	r->idiag_inode	      = 0;
 297
 
 
 
 
 
 
 298	nlmsg_end(skb, nlh);
 299	return 0;
 300}
 301
 302static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
 303			      u32 portid, u32 seq, u16 nlmsg_flags,
 304			      const struct nlmsghdr *unlh)
 305{
 
 306	struct inet_diag_msg *r;
 307	struct nlmsghdr *nlh;
 308	long tmo;
 309
 310	nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
 311			nlmsg_flags);
 312	if (!nlh)
 313		return -EMSGSIZE;
 314
 315	r = nlmsg_data(nlh);
 316	inet_diag_msg_common_fill(r, sk);
 317	r->idiag_state = TCP_SYN_RECV;
 318	r->idiag_timer = 1;
 319	r->idiag_retrans = inet_reqsk(sk)->num_retrans;
 320
 321	BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
 322		     offsetof(struct sock, sk_cookie));
 323
 324	tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
 325	r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0;
 326	r->idiag_rqueue	= 0;
 327	r->idiag_wqueue	= 0;
 328	r->idiag_uid	= 0;
 329	r->idiag_inode	= 0;
 330
 
 
 
 
 
 
 331	nlmsg_end(skb, nlh);
 332	return 0;
 333}
 334
 335static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
 
 336			const struct inet_diag_req_v2 *r,
 337			struct user_namespace *user_ns,
 338			u32 portid, u32 seq, u16 nlmsg_flags,
 339			const struct nlmsghdr *unlh)
 340{
 341	if (sk->sk_state == TCP_TIME_WAIT)
 342		return inet_twsk_diag_fill(sk, skb, portid, seq,
 343					   nlmsg_flags, unlh);
 344
 345	if (sk->sk_state == TCP_NEW_SYN_RECV)
 346		return inet_req_diag_fill(sk, skb, portid, seq,
 347					  nlmsg_flags, unlh);
 348
 349	return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
 350				  nlmsg_flags, unlh);
 351}
 352
 353struct sock *inet_diag_find_one_icsk(struct net *net,
 354				     struct inet_hashinfo *hashinfo,
 355				     const struct inet_diag_req_v2 *req)
 356{
 357	struct sock *sk;
 358
 
 359	if (req->sdiag_family == AF_INET)
 360		sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
 361				 req->id.idiag_dport, req->id.idiag_src[0],
 362				 req->id.idiag_sport, req->id.idiag_if);
 363#if IS_ENABLED(CONFIG_IPV6)
 364	else if (req->sdiag_family == AF_INET6) {
 365		if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
 366		    ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
 367			sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
 368					 req->id.idiag_dport, req->id.idiag_src[3],
 369					 req->id.idiag_sport, req->id.idiag_if);
 370		else
 371			sk = inet6_lookup(net, hashinfo, NULL, 0,
 372					  (struct in6_addr *)req->id.idiag_dst,
 373					  req->id.idiag_dport,
 374					  (struct in6_addr *)req->id.idiag_src,
 375					  req->id.idiag_sport,
 376					  req->id.idiag_if);
 377	}
 378#endif
 379	else
 
 380		return ERR_PTR(-EINVAL);
 381
 
 382	if (!sk)
 383		return ERR_PTR(-ENOENT);
 384
 385	if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
 386		sock_gen_put(sk);
 387		return ERR_PTR(-ENOENT);
 388	}
 389
 390	return sk;
 391}
 392EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
 393
 394int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
 395			    struct sk_buff *in_skb,
 396			    const struct nlmsghdr *nlh,
 397			    const struct inet_diag_req_v2 *req)
 398{
 
 
 399	struct net *net = sock_net(in_skb->sk);
 400	struct sk_buff *rep;
 401	struct sock *sk;
 402	int err;
 403
 404	sk = inet_diag_find_one_icsk(net, hashinfo, req);
 405	if (IS_ERR(sk))
 406		return PTR_ERR(sk);
 407
 408	rep = nlmsg_new(inet_sk_attr_size(), GFP_KERNEL);
 409	if (!rep) {
 410		err = -ENOMEM;
 411		goto out;
 412	}
 413
 414	err = sk_diag_fill(sk, rep, req,
 415			   sk_user_ns(NETLINK_CB(in_skb).sk),
 416			   NETLINK_CB(in_skb).portid,
 417			   nlh->nlmsg_seq, 0, nlh);
 418	if (err < 0) {
 419		WARN_ON(err == -EMSGSIZE);
 420		nlmsg_free(rep);
 421		goto out;
 422	}
 423	err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
 424			      MSG_DONTWAIT);
 425	if (err > 0)
 426		err = 0;
 427
 428out:
 429	if (sk)
 430		sock_gen_put(sk);
 431
 432	return err;
 433}
 434EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
 435
 436static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
 437			       const struct nlmsghdr *nlh,
 
 438			       const struct inet_diag_req_v2 *req)
 439{
 440	const struct inet_diag_handler *handler;
 441	int err;
 
 442
 443	handler = inet_diag_lock_handler(req->sdiag_protocol);
 444	if (IS_ERR(handler))
 
 
 
 
 
 
 
 445		err = PTR_ERR(handler);
 446	else if (cmd == SOCK_DIAG_BY_FAMILY)
 447		err = handler->dump_one(in_skb, nlh, req);
 448	else if (cmd == SOCK_DESTROY && handler->destroy)
 
 
 
 
 
 449		err = handler->destroy(in_skb, req);
 450	else
 451		err = -EOPNOTSUPP;
 
 452	inet_diag_unlock_handler(handler);
 453
 454	return err;
 455}
 456
 457static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
 458{
 459	int words = bits >> 5;
 460
 461	bits &= 0x1f;
 462
 463	if (words) {
 464		if (memcmp(a1, a2, words << 2))
 465			return 0;
 466	}
 467	if (bits) {
 468		__be32 w1, w2;
 469		__be32 mask;
 470
 471		w1 = a1[words];
 472		w2 = a2[words];
 473
 474		mask = htonl((0xffffffff) << (32 - bits));
 475
 476		if ((w1 ^ w2) & mask)
 477			return 0;
 478	}
 479
 480	return 1;
 481}
 482
 483static int inet_diag_bc_run(const struct nlattr *_bc,
 484			    const struct inet_diag_entry *entry)
 485{
 486	const void *bc = nla_data(_bc);
 487	int len = nla_len(_bc);
 488
 489	while (len > 0) {
 490		int yes = 1;
 491		const struct inet_diag_bc_op *op = bc;
 492
 493		switch (op->code) {
 494		case INET_DIAG_BC_NOP:
 495			break;
 496		case INET_DIAG_BC_JMP:
 497			yes = 0;
 498			break;
 
 
 
 499		case INET_DIAG_BC_S_GE:
 500			yes = entry->sport >= op[1].no;
 501			break;
 502		case INET_DIAG_BC_S_LE:
 503			yes = entry->sport <= op[1].no;
 504			break;
 
 
 
 505		case INET_DIAG_BC_D_GE:
 506			yes = entry->dport >= op[1].no;
 507			break;
 508		case INET_DIAG_BC_D_LE:
 509			yes = entry->dport <= op[1].no;
 510			break;
 511		case INET_DIAG_BC_AUTO:
 512			yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
 513			break;
 514		case INET_DIAG_BC_S_COND:
 515		case INET_DIAG_BC_D_COND: {
 516			const struct inet_diag_hostcond *cond;
 517			const __be32 *addr;
 518
 519			cond = (const struct inet_diag_hostcond *)(op + 1);
 520			if (cond->port != -1 &&
 521			    cond->port != (op->code == INET_DIAG_BC_S_COND ?
 522					     entry->sport : entry->dport)) {
 523				yes = 0;
 524				break;
 525			}
 526
 527			if (op->code == INET_DIAG_BC_S_COND)
 528				addr = entry->saddr;
 529			else
 530				addr = entry->daddr;
 531
 532			if (cond->family != AF_UNSPEC &&
 533			    cond->family != entry->family) {
 534				if (entry->family == AF_INET6 &&
 535				    cond->family == AF_INET) {
 536					if (addr[0] == 0 && addr[1] == 0 &&
 537					    addr[2] == htonl(0xffff) &&
 538					    bitstring_match(addr + 3,
 539							    cond->addr,
 540							    cond->prefix_len))
 541						break;
 542				}
 543				yes = 0;
 544				break;
 545			}
 546
 547			if (cond->prefix_len == 0)
 548				break;
 549			if (bitstring_match(addr, cond->addr,
 550					    cond->prefix_len))
 551				break;
 552			yes = 0;
 553			break;
 554		}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 555		}
 556
 557		if (yes) {
 558			len -= op->yes;
 559			bc += op->yes;
 560		} else {
 561			len -= op->no;
 562			bc += op->no;
 563		}
 564	}
 565	return len == 0;
 566}
 567
 568/* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
 569 */
 570static void entry_fill_addrs(struct inet_diag_entry *entry,
 571			     const struct sock *sk)
 572{
 573#if IS_ENABLED(CONFIG_IPV6)
 574	if (sk->sk_family == AF_INET6) {
 575		entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
 576		entry->daddr = sk->sk_v6_daddr.s6_addr32;
 577	} else
 578#endif
 579	{
 580		entry->saddr = &sk->sk_rcv_saddr;
 581		entry->daddr = &sk->sk_daddr;
 582	}
 583}
 584
 585int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
 586{
 587	struct inet_sock *inet = inet_sk(sk);
 588	struct inet_diag_entry entry;
 589
 590	if (!bc)
 591		return 1;
 592
 593	entry.family = sk->sk_family;
 594	entry_fill_addrs(&entry, sk);
 595	entry.sport = inet->inet_num;
 596	entry.dport = ntohs(inet->inet_dport);
 
 597	entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
 
 
 
 
 
 
 
 
 
 
 
 
 598
 599	return inet_diag_bc_run(bc, &entry);
 600}
 601EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
 602
 603static int valid_cc(const void *bc, int len, int cc)
 604{
 605	while (len >= 0) {
 606		const struct inet_diag_bc_op *op = bc;
 607
 608		if (cc > len)
 609			return 0;
 610		if (cc == len)
 611			return 1;
 612		if (op->yes < 4 || op->yes & 3)
 613			return 0;
 614		len -= op->yes;
 615		bc  += op->yes;
 616	}
 617	return 0;
 618}
 619
 
 
 
 
 
 
 
 
 
 
 
 620/* Validate an inet_diag_hostcond. */
 621static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
 622			   int *min_len)
 623{
 624	struct inet_diag_hostcond *cond;
 625	int addr_len;
 626
 627	/* Check hostcond space. */
 628	*min_len += sizeof(struct inet_diag_hostcond);
 629	if (len < *min_len)
 630		return false;
 631	cond = (struct inet_diag_hostcond *)(op + 1);
 632
 633	/* Check address family and address length. */
 634	switch (cond->family) {
 635	case AF_UNSPEC:
 636		addr_len = 0;
 637		break;
 638	case AF_INET:
 639		addr_len = sizeof(struct in_addr);
 640		break;
 641	case AF_INET6:
 642		addr_len = sizeof(struct in6_addr);
 643		break;
 644	default:
 645		return false;
 646	}
 647	*min_len += addr_len;
 648	if (len < *min_len)
 649		return false;
 650
 651	/* Check prefix length (in bits) vs address length (in bytes). */
 652	if (cond->prefix_len > 8 * addr_len)
 653		return false;
 654
 655	return true;
 656}
 657
 658/* Validate a port comparison operator. */
 659static bool valid_port_comparison(const struct inet_diag_bc_op *op,
 660				  int len, int *min_len)
 661{
 662	/* Port comparisons put the port in a follow-on inet_diag_bc_op. */
 663	*min_len += sizeof(struct inet_diag_bc_op);
 664	if (len < *min_len)
 665		return false;
 666	return true;
 667}
 668
 669static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
 
 670{
 671	const void *bc = bytecode;
 672	int  len = bytecode_len;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 673
 674	while (len > 0) {
 675		int min_len = sizeof(struct inet_diag_bc_op);
 676		const struct inet_diag_bc_op *op = bc;
 677
 678		switch (op->code) {
 679		case INET_DIAG_BC_S_COND:
 680		case INET_DIAG_BC_D_COND:
 681			if (!valid_hostcond(bc, len, &min_len))
 682				return -EINVAL;
 683			break;
 
 
 
 
 
 684		case INET_DIAG_BC_S_GE:
 685		case INET_DIAG_BC_S_LE:
 
 686		case INET_DIAG_BC_D_GE:
 687		case INET_DIAG_BC_D_LE:
 688			if (!valid_port_comparison(bc, len, &min_len))
 689				return -EINVAL;
 690			break;
 
 
 
 
 
 
 
 
 
 
 
 
 691		case INET_DIAG_BC_AUTO:
 692		case INET_DIAG_BC_JMP:
 693		case INET_DIAG_BC_NOP:
 694			break;
 695		default:
 696			return -EINVAL;
 697		}
 698
 699		if (op->code != INET_DIAG_BC_NOP) {
 700			if (op->no < min_len || op->no > len + 4 || op->no & 3)
 701				return -EINVAL;
 702			if (op->no < len &&
 703			    !valid_cc(bytecode, bytecode_len, len - op->no))
 704				return -EINVAL;
 705		}
 706
 707		if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
 708			return -EINVAL;
 709		bc  += op->yes;
 710		len -= op->yes;
 711	}
 712	return len == 0 ? 0 : -EINVAL;
 713}
 714
 715static int inet_csk_diag_dump(struct sock *sk,
 716			      struct sk_buff *skb,
 717			      struct netlink_callback *cb,
 718			      const struct inet_diag_req_v2 *r,
 719			      const struct nlattr *bc)
 720{
 721	if (!inet_diag_bc_sk(bc, sk))
 722		return 0;
 723
 724	return inet_csk_diag_fill(sk, skb, r,
 725				  sk_user_ns(NETLINK_CB(cb->skb).sk),
 726				  NETLINK_CB(cb->skb).portid,
 727				  cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
 728}
 729
 730static void twsk_build_assert(void)
 731{
 732	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
 733		     offsetof(struct sock, sk_family));
 734
 735	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
 736		     offsetof(struct inet_sock, inet_num));
 737
 738	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
 739		     offsetof(struct inet_sock, inet_dport));
 740
 741	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
 742		     offsetof(struct inet_sock, inet_rcv_saddr));
 743
 744	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
 745		     offsetof(struct inet_sock, inet_daddr));
 746
 747#if IS_ENABLED(CONFIG_IPV6)
 748	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
 749		     offsetof(struct sock, sk_v6_rcv_saddr));
 750
 751	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
 752		     offsetof(struct sock, sk_v6_daddr));
 753#endif
 754}
 755
 756void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
 757			 struct netlink_callback *cb,
 758			 const struct inet_diag_req_v2 *r, struct nlattr *bc)
 759{
 
 
 760	struct net *net = sock_net(skb->sk);
 761	int i, num, s_i, s_num;
 762	u32 idiag_states = r->idiag_states;
 
 
 
 763
 
 764	if (idiag_states & TCPF_SYN_RECV)
 765		idiag_states |= TCPF_NEW_SYN_RECV;
 766	s_i = cb->args[1];
 767	s_num = num = cb->args[2];
 768
 769	if (cb->args[0] == 0) {
 770		if (!(idiag_states & TCPF_LISTEN))
 771			goto skip_listen_ht;
 772
 773		for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
 774			struct inet_listen_hashbucket *ilb;
 775			struct hlist_nulls_node *node;
 776			struct sock *sk;
 777
 778			num = 0;
 779			ilb = &hashinfo->listening_hash[i];
 780			spin_lock_bh(&ilb->lock);
 781			sk_nulls_for_each(sk, node, &ilb->head) {
 
 782				struct inet_sock *inet = inet_sk(sk);
 783
 784				if (!net_eq(sock_net(sk), net))
 785					continue;
 786
 787				if (num < s_num) {
 788					num++;
 789					continue;
 790				}
 791
 792				if (r->sdiag_family != AF_UNSPEC &&
 793				    sk->sk_family != r->sdiag_family)
 794					goto next_listen;
 795
 796				if (r->id.idiag_sport != inet->inet_sport &&
 797				    r->id.idiag_sport)
 798					goto next_listen;
 799
 800				if (r->id.idiag_dport ||
 801				    cb->args[3] > 0)
 802					goto next_listen;
 803
 804				if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
 805					spin_unlock_bh(&ilb->lock);
 
 
 806					goto done;
 807				}
 808
 809next_listen:
 810				cb->args[3] = 0;
 811				cb->args[4] = 0;
 812				++num;
 813			}
 814			spin_unlock_bh(&ilb->lock);
 815
 816			s_num = 0;
 817			cb->args[3] = 0;
 818			cb->args[4] = 0;
 819		}
 820skip_listen_ht:
 821		cb->args[0] = 1;
 822		s_i = num = s_num = 0;
 823	}
 824
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 825	if (!(idiag_states & ~TCPF_LISTEN))
 826		goto out;
 827
 828	for (i = s_i; i <= hashinfo->ehash_mask; i++) {
 829		struct inet_ehash_bucket *head = &hashinfo->ehash[i];
 830		spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
 831		struct hlist_nulls_node *node;
 832		struct sock *sk;
 833
 834		num = 0;
 835
 836		if (hlist_nulls_empty(&head->chain))
 837			continue;
 838
 839		if (i > s_i)
 840			s_num = 0;
 841
 
 
 
 842		spin_lock_bh(lock);
 843		sk_nulls_for_each(sk, node, &head->chain) {
 844			int state, res;
 845
 846			if (!net_eq(sock_net(sk), net))
 847				continue;
 848			if (num < s_num)
 849				goto next_normal;
 850			state = (sk->sk_state == TCP_TIME_WAIT) ?
 851				inet_twsk(sk)->tw_substate : sk->sk_state;
 852			if (!(idiag_states & (1 << state)))
 853				goto next_normal;
 854			if (r->sdiag_family != AF_UNSPEC &&
 855			    sk->sk_family != r->sdiag_family)
 856				goto next_normal;
 857			if (r->id.idiag_sport != htons(sk->sk_num) &&
 858			    r->id.idiag_sport)
 859				goto next_normal;
 860			if (r->id.idiag_dport != sk->sk_dport &&
 861			    r->id.idiag_dport)
 862				goto next_normal;
 863			twsk_build_assert();
 864
 865			if (!inet_diag_bc_sk(bc, sk))
 866				goto next_normal;
 867
 868			res = sk_diag_fill(sk, skb, r,
 869					   sk_user_ns(NETLINK_CB(cb->skb).sk),
 870					   NETLINK_CB(cb->skb).portid,
 871					   cb->nlh->nlmsg_seq, NLM_F_MULTI,
 872					   cb->nlh);
 873			if (res < 0) {
 874				spin_unlock_bh(lock);
 875				goto done;
 876			}
 877next_normal:
 878			++num;
 879		}
 880
 881		spin_unlock_bh(lock);
 
 
 
 
 
 
 
 
 
 
 
 
 882		cond_resched();
 
 
 
 
 883	}
 884
 885done:
 886	cb->args[1] = i;
 887	cb->args[2] = num;
 888out:
 889	;
 890}
 891EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
 892
 893static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
 894			    const struct inet_diag_req_v2 *r,
 895			    struct nlattr *bc)
 896{
 
 897	const struct inet_diag_handler *handler;
 898	int err = 0;
 
 899
 900	handler = inet_diag_lock_handler(r->sdiag_protocol);
 
 
 
 
 901	if (!IS_ERR(handler))
 902		handler->dump(skb, cb, r, bc);
 903	else
 904		err = PTR_ERR(handler);
 905	inet_diag_unlock_handler(handler);
 906
 
 
 
 
 
 
 
 
 
 907	return err ? : skb->len;
 908}
 909
 910static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
 911{
 912	int hdrlen = sizeof(struct inet_diag_req_v2);
 913	struct nlattr *bc = NULL;
 914
 915	if (nlmsg_attrlen(cb->nlh, hdrlen))
 916		bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
 
 
 
 
 
 
 
 
 
 917
 918	return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 919}
 920
 921static int inet_diag_type2proto(int type)
 922{
 923	switch (type) {
 924	case TCPDIAG_GETSOCK:
 925		return IPPROTO_TCP;
 926	case DCCPDIAG_GETSOCK:
 927		return IPPROTO_DCCP;
 928	default:
 929		return 0;
 930	}
 931}
 932
 933static int inet_diag_dump_compat(struct sk_buff *skb,
 934				 struct netlink_callback *cb)
 935{
 936	struct inet_diag_req *rc = nlmsg_data(cb->nlh);
 937	int hdrlen = sizeof(struct inet_diag_req);
 938	struct inet_diag_req_v2 req;
 939	struct nlattr *bc = NULL;
 940
 941	req.sdiag_family = AF_UNSPEC; /* compatibility */
 942	req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
 943	req.idiag_ext = rc->idiag_ext;
 944	req.idiag_states = rc->idiag_states;
 945	req.id = rc->id;
 946
 947	if (nlmsg_attrlen(cb->nlh, hdrlen))
 948		bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
 949
 950	return __inet_diag_dump(skb, cb, &req, bc);
 951}
 952
 953static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
 954				      const struct nlmsghdr *nlh)
 955{
 956	struct inet_diag_req *rc = nlmsg_data(nlh);
 957	struct inet_diag_req_v2 req;
 958
 959	req.sdiag_family = rc->idiag_family;
 960	req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
 961	req.idiag_ext = rc->idiag_ext;
 962	req.idiag_states = rc->idiag_states;
 963	req.id = rc->id;
 964
 965	return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req);
 
 966}
 967
 968static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
 969{
 970	int hdrlen = sizeof(struct inet_diag_req);
 971	struct net *net = sock_net(skb->sk);
 972
 973	if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
 974	    nlmsg_len(nlh) < hdrlen)
 975		return -EINVAL;
 976
 977	if (nlh->nlmsg_flags & NLM_F_DUMP) {
 978		if (nlmsg_attrlen(nlh, hdrlen)) {
 979			struct nlattr *attr;
 980
 981			attr = nlmsg_find_attr(nlh, hdrlen,
 982					       INET_DIAG_REQ_BYTECODE);
 983			if (!attr ||
 984			    nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
 985			    inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
 986				return -EINVAL;
 987		}
 988		{
 989			struct netlink_dump_control c = {
 990				.dump = inet_diag_dump_compat,
 991			};
 992			return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
 993		}
 994	}
 995
 996	return inet_diag_get_exact_compat(skb, nlh);
 997}
 998
 999static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
1000{
1001	int hdrlen = sizeof(struct inet_diag_req_v2);
1002	struct net *net = sock_net(skb->sk);
1003
1004	if (nlmsg_len(h) < hdrlen)
1005		return -EINVAL;
1006
1007	if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1008	    h->nlmsg_flags & NLM_F_DUMP) {
1009		if (nlmsg_attrlen(h, hdrlen)) {
1010			struct nlattr *attr;
1011
1012			attr = nlmsg_find_attr(h, hdrlen,
1013					       INET_DIAG_REQ_BYTECODE);
1014			if (!attr ||
1015			    nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1016			    inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1017				return -EINVAL;
1018		}
1019		{
1020			struct netlink_dump_control c = {
1021				.dump = inet_diag_dump,
1022			};
1023			return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1024		}
1025	}
1026
1027	return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h));
 
1028}
1029
1030static
1031int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1032{
1033	const struct inet_diag_handler *handler;
1034	struct nlmsghdr *nlh;
1035	struct nlattr *attr;
1036	struct inet_diag_msg *r;
1037	void *info = NULL;
1038	int err = 0;
1039
1040	nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1041	if (!nlh)
1042		return -ENOMEM;
1043
1044	r = nlmsg_data(nlh);
1045	memset(r, 0, sizeof(*r));
1046	inet_diag_msg_common_fill(r, sk);
1047	if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1048		r->id.idiag_sport = inet_sk(sk)->inet_sport;
1049	r->idiag_state = sk->sk_state;
1050
1051	if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1052		nlmsg_cancel(skb, nlh);
1053		return err;
1054	}
1055
1056	handler = inet_diag_lock_handler(sk->sk_protocol);
1057	if (IS_ERR(handler)) {
1058		inet_diag_unlock_handler(handler);
1059		nlmsg_cancel(skb, nlh);
1060		return PTR_ERR(handler);
1061	}
1062
1063	attr = handler->idiag_info_size
1064		? nla_reserve(skb, INET_DIAG_INFO, handler->idiag_info_size)
 
 
1065		: NULL;
1066	if (attr)
1067		info = nla_data(attr);
1068
1069	handler->idiag_get_info(sk, r, info);
1070	inet_diag_unlock_handler(handler);
1071
1072	nlmsg_end(skb, nlh);
1073	return 0;
1074}
1075
1076static const struct sock_diag_handler inet_diag_handler = {
1077	.family = AF_INET,
1078	.dump = inet_diag_handler_cmd,
1079	.get_info = inet_diag_handler_get_info,
1080	.destroy = inet_diag_handler_cmd,
1081};
1082
1083static const struct sock_diag_handler inet6_diag_handler = {
1084	.family = AF_INET6,
1085	.dump = inet_diag_handler_cmd,
1086	.get_info = inet_diag_handler_get_info,
1087	.destroy = inet_diag_handler_cmd,
1088};
1089
1090int inet_diag_register(const struct inet_diag_handler *h)
1091{
1092	const __u16 type = h->idiag_type;
1093	int err = -EINVAL;
1094
1095	if (type >= IPPROTO_MAX)
1096		goto out;
1097
1098	mutex_lock(&inet_diag_table_mutex);
1099	err = -EEXIST;
1100	if (!inet_diag_table[type]) {
1101		inet_diag_table[type] = h;
1102		err = 0;
1103	}
1104	mutex_unlock(&inet_diag_table_mutex);
1105out:
1106	return err;
1107}
1108EXPORT_SYMBOL_GPL(inet_diag_register);
1109
1110void inet_diag_unregister(const struct inet_diag_handler *h)
1111{
1112	const __u16 type = h->idiag_type;
1113
1114	if (type >= IPPROTO_MAX)
1115		return;
1116
1117	mutex_lock(&inet_diag_table_mutex);
1118	inet_diag_table[type] = NULL;
1119	mutex_unlock(&inet_diag_table_mutex);
1120}
1121EXPORT_SYMBOL_GPL(inet_diag_unregister);
1122
1123static int __init inet_diag_init(void)
1124{
1125	const int inet_diag_table_size = (IPPROTO_MAX *
1126					  sizeof(struct inet_diag_handler *));
1127	int err = -ENOMEM;
1128
1129	inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1130	if (!inet_diag_table)
1131		goto out;
1132
1133	err = sock_diag_register(&inet_diag_handler);
1134	if (err)
1135		goto out_free_nl;
1136
1137	err = sock_diag_register(&inet6_diag_handler);
1138	if (err)
1139		goto out_free_inet;
1140
1141	sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1142out:
1143	return err;
1144
1145out_free_inet:
1146	sock_diag_unregister(&inet_diag_handler);
1147out_free_nl:
1148	kfree(inet_diag_table);
1149	goto out;
1150}
1151
1152static void __exit inet_diag_exit(void)
1153{
1154	sock_diag_unregister(&inet6_diag_handler);
1155	sock_diag_unregister(&inet_diag_handler);
1156	sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1157	kfree(inet_diag_table);
1158}
1159
1160module_init(inet_diag_init);
1161module_exit(inet_diag_exit);
1162MODULE_LICENSE("GPL");
 
1163MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1164MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);