[mirror_ubuntu-zesty-kernel.git] / net / ipv4 / udp_diag.c

/*
 * udp_diag.c	Module for monitoring UDP transport protocols sockets.
 *
 * Authors:	Pavel Emelyanov, <xemul@parallels.com>
 *
 *	This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */


#include <linux/module.h>
#include <linux/inet_diag.h>
#include <linux/udp.h>
#include <net/udp.h>
#include <net/udplite.h>
#include <linux/sock_diag.h>

static int sk_diag_dump(struct sock *sk, struct sk_buff *skb,
			struct netlink_callback *cb,
			const struct inet_diag_req_v2 *req,
			struct nlattr *bc, bool net_admin)
{
	if (!inet_diag_bc_sk(bc, sk))
		return 0;

	return inet_sk_diag_fill(sk, NULL, skb, req,
			sk_user_ns(NETLINK_CB(cb->skb).sk),
			NETLINK_CB(cb->skb).portid,
			cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh, net_admin);
}

static int udp_dump_one(struct udp_table *tbl, struct sk_buff *in_skb,
			const struct nlmsghdr *nlh,
			const struct inet_diag_req_v2 *req)
{
	int err = -EINVAL;
	struct sock *sk = NULL;
	struct sk_buff *rep;
	struct net *net = sock_net(in_skb->sk);

	rcu_read_lock();
	if (req->sdiag_family == AF_INET)
		sk = __udp4_lib_lookup(net,
				req->id.idiag_src[0], req->id.idiag_sport,
				req->id.idiag_dst[0], req->id.idiag_dport,
				req->id.idiag_if, tbl, NULL);
#if IS_ENABLED(CONFIG_IPV6)
	else if (req->sdiag_family == AF_INET6)
		sk = __udp6_lib_lookup(net,
				(struct in6_addr *)req->id.idiag_src,
				req->id.idiag_sport,
				(struct in6_addr *)req->id.idiag_dst,
				req->id.idiag_dport,
				req->id.idiag_if, tbl, NULL);
#endif
	if (sk && !atomic_inc_not_zero(&sk->sk_refcnt))
		sk = NULL;
	rcu_read_unlock();
	err = -ENOENT;
	if (!sk)
		goto out_nosk;

	err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
	if (err)
		goto out;

	err = -ENOMEM;
	rep = nlmsg_new(sizeof(struct inet_diag_msg) +
			sizeof(struct inet_diag_meminfo) + 64,
			GFP_KERNEL);
	if (!rep)
		goto out;

	err = inet_sk_diag_fill(sk, NULL, rep, req,
			   sk_user_ns(NETLINK_CB(in_skb).sk),
			   NETLINK_CB(in_skb).portid,
			   nlh->nlmsg_seq, 0, nlh,
			   netlink_net_capable(in_skb, CAP_NET_ADMIN));
	if (err < 0) {
		WARN_ON(err == -EMSGSIZE);
		kfree_skb(rep);
		goto out;
	}
	err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
			      MSG_DONTWAIT);
	if (err > 0)
		err = 0;
out:
	if (sk)
		sock_put(sk);
out_nosk:
	return err;
}

static void udp_dump(struct udp_table *table, struct sk_buff *skb,
		     struct netlink_callback *cb,
		     const struct inet_diag_req_v2 *r, struct nlattr *bc)
{
	bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
	struct net *net = sock_net(skb->sk);
	int num, s_num, slot, s_slot;

	s_slot = cb->args[0];
	num = s_num = cb->args[1];

	for (slot = s_slot; slot <= table->mask; s_num = 0, slot++) {
		struct udp_hslot *hslot = &table->hash[slot];
		struct sock *sk;

		num = 0;

		if (hlist_empty(&hslot->head))
			continue;

		spin_lock_bh(&hslot->lock);
		sk_for_each(sk, &hslot->head) {
			struct inet_sock *inet = inet_sk(sk);

			if (!net_eq(sock_net(sk), net))
				continue;
			if (num < s_num)
				goto next;
			if (!(r->idiag_states & (1 << sk->sk_state)))
				goto next;
			if (r->sdiag_family != AF_UNSPEC &&
					sk->sk_family != r->sdiag_family)
				goto next;
			if (r->id.idiag_sport != inet->inet_sport &&
			    r->id.idiag_sport)
				goto next;
			if (r->id.idiag_dport != inet->inet_dport &&
			    r->id.idiag_dport)
				goto next;

			if (sk_diag_dump(sk, skb, cb, r, bc, net_admin) < 0) {
				spin_unlock_bh(&hslot->lock);
				goto done;
			}
next:
			num++;
		}
		spin_unlock_bh(&hslot->lock);
	}
done:
	cb->args[0] = slot;
	cb->args[1] = num;
}

static void udp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
			  const struct inet_diag_req_v2 *r, struct nlattr *bc)
{
	udp_dump(&udp_table, skb, cb, r, bc);
}

static int udp_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh,
			     const struct inet_diag_req_v2 *req)
{
	return udp_dump_one(&udp_table, in_skb, nlh, req);
}

static void udp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
		void *info)
{
	r->idiag_rqueue = sk_rmem_alloc_get(sk);
	r->idiag_wqueue = sk_wmem_alloc_get(sk);
}

#ifdef CONFIG_INET_DIAG_DESTROY
static int __udp_diag_destroy(struct sk_buff *in_skb,
			      const struct inet_diag_req_v2 *req,
			      struct udp_table *tbl)
{
	struct net *net = sock_net(in_skb->sk);
	struct sock *sk;
	int err;

	rcu_read_lock();

	if (req->sdiag_family == AF_INET)
		sk = __udp4_lib_lookup(net,
				req->id.idiag_dst[0], req->id.idiag_dport,
				req->id.idiag_src[0], req->id.idiag_sport,
				req->id.idiag_if, tbl, NULL);
#if IS_ENABLED(CONFIG_IPV6)
	else if (req->sdiag_family == AF_INET6) {
		if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
		    ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
			sk = __udp4_lib_lookup(net,
					req->id.idiag_dst[3], req->id.idiag_dport,
					req->id.idiag_src[3], req->id.idiag_sport,
					req->id.idiag_if, tbl, NULL);

		else
			sk = __udp6_lib_lookup(net,
					(struct in6_addr *)req->id.idiag_dst,
					req->id.idiag_dport,
					(struct in6_addr *)req->id.idiag_src,
					req->id.idiag_sport,
					req->id.idiag_if, tbl, NULL);
	}
#endif
	else {
		rcu_read_unlock();
		return -EINVAL;
	}

	if (sk && !atomic_inc_not_zero(&sk->sk_refcnt))
		sk = NULL;

	rcu_read_unlock();

	if (!sk)
		return -ENOENT;

	if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
		sock_put(sk);
		return -ENOENT;
	}

	err = sock_diag_destroy(sk, ECONNABORTED);

	sock_put(sk);

	return err;
}

static int udp_diag_destroy(struct sk_buff *in_skb,
			    const struct inet_diag_req_v2 *req)
{
	return __udp_diag_destroy(in_skb, req, &udp_table);
}

static int udplite_diag_destroy(struct sk_buff *in_skb,
				const struct inet_diag_req_v2 *req)
{
	return __udp_diag_destroy(in_skb, req, &udplite_table);
}

#endif

static const struct inet_diag_handler udp_diag_handler = {
	.dump		 = udp_diag_dump,
	.dump_one	 = udp_diag_dump_one,
	.idiag_get_info  = udp_diag_get_info,
	.idiag_type	 = IPPROTO_UDP,
	.idiag_info_size = 0,
#ifdef CONFIG_INET_DIAG_DESTROY
	.destroy	 = udp_diag_destroy,
#endif
};

static void udplite_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
			      const struct inet_diag_req_v2 *r,
			      struct nlattr *bc)
{
	udp_dump(&udplite_table, skb, cb, r, bc);
}

static int udplite_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh,
				 const struct inet_diag_req_v2 *req)
{
	return udp_dump_one(&udplite_table, in_skb, nlh, req);
}

static const struct inet_diag_handler udplite_diag_handler = {
	.dump		 = udplite_diag_dump,
	.dump_one	 = udplite_diag_dump_one,
	.idiag_get_info  = udp_diag_get_info,
	.idiag_type	 = IPPROTO_UDPLITE,
	.idiag_info_size = 0,
#ifdef CONFIG_INET_DIAG_DESTROY
	.destroy	 = udplite_diag_destroy,
#endif
};

static int __init udp_diag_init(void)
{
	int err;

	err = inet_diag_register(&udp_diag_handler);
	if (err)
		goto out;
	err = inet_diag_register(&udplite_diag_handler);
	if (err)
		goto out_lite;
out:
	return err;
out_lite:
	inet_diag_unregister(&udp_diag_handler);
	goto out;
}

static void __exit udp_diag_exit(void)
{
	inet_diag_unregister(&udplite_diag_handler);
	inet_diag_unregister(&udp_diag_handler);
}

module_init(udp_diag_init);
module_exit(udp_diag_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-17 /* AF_INET - IPPROTO_UDP */);
MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-136 /* AF_INET - IPPROTO_UDPLITE */);
Commit	Line	Data
52b7c59b PE	1	/*
	2	* udp_diag.c Module for monitoring UDP transport protocols sockets.
	3	*
	4	* Authors: Pavel Emelyanov, <xemul@parallels.com>
	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
	13	#include <linux/module.h>
	14	#include <linux/inet_diag.h>
	15	#include <linux/udp.h>
	16	#include <net/udp.h>
	17	#include <net/udplite.h>
52b7c59b PE	18	#include <linux/sock_diag.h>
52b7c59b PE	19
b6d640c2	20	static int sk_diag_dump(struct sock sk, struct sk_buff skb,
34160ea3 ED	21	struct netlink_callback *cb,
34160ea3 ED	22	const struct inet_diag_req_v2 *req,
d545caca	23	struct nlattr *bc, bool net_admin)
b6d640c2 PE	24	{
	25	if (!inet_diag_bc_sk(bc, sk))
	26	return 0;
	27
d06ca956	28	return inet_sk_diag_fill(sk, NULL, skb, req,
e32123e5	29	sk_user_ns(NETLINK_CB(cb->skb).sk),
15e47304	30	NETLINK_CB(cb->skb).portid,
d545caca	31	cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh, net_admin);
b6d640c2 PE	32	}
b6d640c2 PE	33
52b7c59b	34	static int udp_dump_one(struct udp_table tbl, struct sk_buff in_skb,
34160ea3 ED	35	const struct nlmsghdr *nlh,
34160ea3 ED	36	const struct inet_diag_req_v2 *req)
52b7c59b	37	{
a925aa00	38	int err = -EINVAL;
ca065d0c	39	struct sock *sk = NULL;
a925aa00	40	struct sk_buff *rep;
51d7cccf	41	struct net *net = sock_net(in_skb->sk);
a925aa00	42
ca065d0c	43	rcu_read_lock();
a925aa00	44	if (req->sdiag_family == AF_INET)
51d7cccf	45	sk = __udp4_lib_lookup(net,
a925aa00 PE	46	req->id.idiag_src[0], req->id.idiag_sport,
a925aa00 PE	47	req->id.idiag_dst[0], req->id.idiag_dport,
538950a1	48	req->id.idiag_if, tbl, NULL);
86e62ad6	49	#if IS_ENABLED(CONFIG_IPV6)
a925aa00	50	else if (req->sdiag_family == AF_INET6)
51d7cccf	51	sk = __udp6_lib_lookup(net,
a925aa00 PE	52	(struct in6_addr *)req->id.idiag_src,
	53	req->id.idiag_sport,
	54	(struct in6_addr *)req->id.idiag_dst,
	55	req->id.idiag_dport,
538950a1	56	req->id.idiag_if, tbl, NULL);
86e62ad6	57	#endif
ca065d0c ED	58	if (sk && !atomic_inc_not_zero(&sk->sk_refcnt))
	59	sk = NULL;
	60	rcu_read_unlock();
a925aa00	61	err = -ENOENT;
51456b29	62	if (!sk)
a925aa00 PE	63	goto out_nosk;
a925aa00 PE	64
f65c1b53	65	err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
a925aa00 PE	66	if (err)
	67	goto out;
	68
	69	err = -ENOMEM;
573ce260 H	70	rep = nlmsg_new(sizeof(struct inet_diag_msg) +
	71	sizeof(struct inet_diag_meminfo) + 64,
	72	GFP_KERNEL);
a925aa00 PE	73	if (!rep)
	74	goto out;
	75
	76	err = inet_sk_diag_fill(sk, NULL, rep, req,
e32123e5	77	sk_user_ns(NETLINK_CB(in_skb).sk),
15e47304	78	NETLINK_CB(in_skb).portid,
d545caca LC	79	nlh->nlmsg_seq, 0, nlh,
d545caca LC	80	netlink_net_capable(in_skb, CAP_NET_ADMIN));
a925aa00 PE	81	if (err < 0) {
	82	WARN_ON(err == -EMSGSIZE);
	83	kfree_skb(rep);
	84	goto out;
	85	}
15e47304	86	err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
a925aa00 PE	87	MSG_DONTWAIT);
	88	if (err > 0)
	89	err = 0;
	90	out:
	91	if (sk)
	92	sock_put(sk);
	93	out_nosk:
	94	return err;
52b7c59b PE	95	}
52b7c59b PE	96
34160ea3 ED	97	static void udp_dump(struct udp_table table, struct sk_buff skb,
	98	struct netlink_callback *cb,
	99	const struct inet_diag_req_v2 r, struct nlattr bc)
52b7c59b	100	{
d545caca	101	bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
51d7cccf	102	struct net *net = sock_net(skb->sk);
ca065d0c	103	int num, s_num, slot, s_slot;
b6d640c2 PE	104
	105	s_slot = cb->args[0];
	106	num = s_num = cb->args[1];
	107
86f3cddb	108	for (slot = s_slot; slot <= table->mask; s_num = 0, slot++) {
b6d640c2	109	struct udp_hslot *hslot = &table->hash[slot];
ca065d0c	110	struct sock *sk;
b6d640c2	111
86f3cddb HX	112	num = 0;
86f3cddb HX	113
ca065d0c	114	if (hlist_empty(&hslot->head))
b6d640c2 PE	115	continue;
	116
	117	spin_lock_bh(&hslot->lock);
ca065d0c	118	sk_for_each(sk, &hslot->head) {
b6d640c2 PE	119	struct inet_sock *inet = inet_sk(sk);
b6d640c2 PE	120
51d7cccf AV	121	if (!net_eq(sock_net(sk), net))
51d7cccf AV	122	continue;
b6d640c2 PE	123	if (num < s_num)
	124	goto next;
	125	if (!(r->idiag_states & (1 << sk->sk_state)))
	126	goto next;
	127	if (r->sdiag_family != AF_UNSPEC &&
	128	sk->sk_family != r->sdiag_family)
	129	goto next;
	130	if (r->id.idiag_sport != inet->inet_sport &&
	131	r->id.idiag_sport)
	132	goto next;
	133	if (r->id.idiag_dport != inet->inet_dport &&
	134	r->id.idiag_dport)
	135	goto next;
	136
d545caca	137	if (sk_diag_dump(sk, skb, cb, r, bc, net_admin) < 0) {
b6d640c2 PE	138	spin_unlock_bh(&hslot->lock);
	139	goto done;
	140	}
	141	next:
	142	num++;
	143	}
	144	spin_unlock_bh(&hslot->lock);
	145	}
	146	done:
	147	cb->args[0] = slot;
	148	cb->args[1] = num;
52b7c59b PE	149	}
	150
	151	static void udp_diag_dump(struct sk_buff skb, struct netlink_callback cb,
34160ea3	152	const struct inet_diag_req_v2 r, struct nlattr bc)
52b7c59b PE	153	{
	154	udp_dump(&udp_table, skb, cb, r, bc);
	155	}
	156
	157	static int udp_diag_dump_one(struct sk_buff in_skb, const struct nlmsghdr nlh,
34160ea3	158	const struct inet_diag_req_v2 *req)
52b7c59b PE	159	{
	160	return udp_dump_one(&udp_table, in_skb, nlh, req);
	161	}
	162
62ad6fcd SW	163	static void udp_diag_get_info(struct sock sk, struct inet_diag_msg r,
	164	void *info)
	165	{
	166	r->idiag_rqueue = sk_rmem_alloc_get(sk);
	167	r->idiag_wqueue = sk_wmem_alloc_get(sk);
	168	}
	169
5d77dca8 DA	170	#ifdef CONFIG_INET_DIAG_DESTROY
	171	static int __udp_diag_destroy(struct sk_buff *in_skb,
	172	const struct inet_diag_req_v2 *req,
	173	struct udp_table *tbl)
	174	{
	175	struct net *net = sock_net(in_skb->sk);
	176	struct sock *sk;
	177	int err;
	178
	179	rcu_read_lock();
	180
	181	if (req->sdiag_family == AF_INET)
	182	sk = __udp4_lib_lookup(net,
	183	req->id.idiag_dst[0], req->id.idiag_dport,
	184	req->id.idiag_src[0], req->id.idiag_sport,
	185	req->id.idiag_if, tbl, NULL);
	186	#if IS_ENABLED(CONFIG_IPV6)
	187	else if (req->sdiag_family == AF_INET6) {
	188	if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
	189	ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
	190	sk = __udp4_lib_lookup(net,
f95bf346 LC	191	req->id.idiag_dst[3], req->id.idiag_dport,
f95bf346 LC	192	req->id.idiag_src[3], req->id.idiag_sport,
5d77dca8 DA	193	req->id.idiag_if, tbl, NULL);
	194
	195	else
	196	sk = __udp6_lib_lookup(net,
	197	(struct in6_addr *)req->id.idiag_dst,
	198	req->id.idiag_dport,
	199	(struct in6_addr *)req->id.idiag_src,
	200	req->id.idiag_sport,
	201	req->id.idiag_if, tbl, NULL);
	202	}
	203	#endif
	204	else {
	205	rcu_read_unlock();
	206	return -EINVAL;
	207	}
	208
	209	if (sk && !atomic_inc_not_zero(&sk->sk_refcnt))
	210	sk = NULL;
	211
	212	rcu_read_unlock();
	213
	214	if (!sk)
	215	return -ENOENT;
	216
	217	if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
	218	sock_put(sk);
	219	return -ENOENT;
	220	}
	221
	222	err = sock_diag_destroy(sk, ECONNABORTED);
	223
	224	sock_put(sk);
	225
	226	return err;
	227	}
	228
	229	static int udp_diag_destroy(struct sk_buff *in_skb,
	230	const struct inet_diag_req_v2 *req)
	231	{
	232	return __udp_diag_destroy(in_skb, req, &udp_table);
	233	}
	234
	235	static int udplite_diag_destroy(struct sk_buff *in_skb,
	236	const struct inet_diag_req_v2 *req)
	237	{
	238	return __udp_diag_destroy(in_skb, req, &udplite_table);
	239	}
	240
	241	#endif
	242
52b7c59b PE	243	static const struct inet_diag_handler udp_diag_handler = {
	244	.dump = udp_diag_dump,
	245	.dump_one = udp_diag_dump_one,
62ad6fcd	246	.idiag_get_info = udp_diag_get_info,
52b7c59b	247	.idiag_type = IPPROTO_UDP,
3fd22af8	248	.idiag_info_size = 0,
5d77dca8 DA	249	#ifdef CONFIG_INET_DIAG_DESTROY
	250	.destroy = udp_diag_destroy,
	251	#endif
52b7c59b PE	252	};
	253
	254	static void udplite_diag_dump(struct sk_buff skb, struct netlink_callback cb,
34160ea3 ED	255	const struct inet_diag_req_v2 *r,
34160ea3 ED	256	struct nlattr *bc)
52b7c59b PE	257	{
	258	udp_dump(&udplite_table, skb, cb, r, bc);
	259	}
	260
	261	static int udplite_diag_dump_one(struct sk_buff in_skb, const struct nlmsghdr nlh,
34160ea3	262	const struct inet_diag_req_v2 *req)
52b7c59b PE	263	{
	264	return udp_dump_one(&udplite_table, in_skb, nlh, req);
	265	}
	266
	267	static const struct inet_diag_handler udplite_diag_handler = {
	268	.dump = udplite_diag_dump,
	269	.dump_one = udplite_diag_dump_one,
62ad6fcd	270	.idiag_get_info = udp_diag_get_info,
52b7c59b	271	.idiag_type = IPPROTO_UDPLITE,
3fd22af8	272	.idiag_info_size = 0,
5d77dca8 DA	273	#ifdef CONFIG_INET_DIAG_DESTROY
	274	.destroy = udplite_diag_destroy,
	275	#endif
52b7c59b PE	276	};
	277
	278	static int __init udp_diag_init(void)
	279	{
	280	int err;
	281
	282	err = inet_diag_register(&udp_diag_handler);
	283	if (err)
	284	goto out;
	285	err = inet_diag_register(&udplite_diag_handler);
	286	if (err)
	287	goto out_lite;
	288	out:
	289	return err;
	290	out_lite:
	291	inet_diag_unregister(&udp_diag_handler);
	292	goto out;
	293	}
	294
	295	static void __exit udp_diag_exit(void)
	296	{
	297	inet_diag_unregister(&udplite_diag_handler);
	298	inet_diag_unregister(&udp_diag_handler);
	299	}
	300
	301	module_init(udp_diag_init);
	302	module_exit(udp_diag_exit);
	303	MODULE_LICENSE("GPL");
aec8dc62 PE	304	MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-17 /* AF_INET - IPPROTO_UDP */);
aec8dc62 PE	305	MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-136 /* AF_INET - IPPROTO_UDPLITE */);