[linux-2.6-block.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)
{
	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);
}

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);
	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)
{
	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) < 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);
}

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,
};

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,
};

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,
	22	const struct inet_diag_req_v2 *req,
	23	struct nlattr *bc)
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,
b6d640c2 PE	31	cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
	32	}
	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,
a925aa00 PE	79	nlh->nlmsg_seq, 0, nlh);
	80	if (err < 0) {
	81	WARN_ON(err == -EMSGSIZE);
	82	kfree_skb(rep);
	83	goto out;
	84	}
15e47304	85	err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
a925aa00 PE	86	MSG_DONTWAIT);
	87	if (err > 0)
	88	err = 0;
	89	out:
	90	if (sk)
	91	sock_put(sk);
	92	out_nosk:
	93	return err;
52b7c59b PE	94	}
52b7c59b PE	95
34160ea3 ED	96	static void udp_dump(struct udp_table table, struct sk_buff skb,
	97	struct netlink_callback *cb,
	98	const struct inet_diag_req_v2 r, struct nlattr bc)
52b7c59b	99	{
51d7cccf	100	struct net *net = sock_net(skb->sk);
ca065d0c	101	int num, s_num, slot, s_slot;
b6d640c2 PE	102
	103	s_slot = cb->args[0];
	104	num = s_num = cb->args[1];
	105
86f3cddb	106	for (slot = s_slot; slot <= table->mask; s_num = 0, slot++) {
b6d640c2	107	struct udp_hslot *hslot = &table->hash[slot];
ca065d0c	108	struct sock *sk;
b6d640c2	109
86f3cddb HX	110	num = 0;
86f3cddb HX	111
ca065d0c	112	if (hlist_empty(&hslot->head))
b6d640c2 PE	113	continue;
	114
	115	spin_lock_bh(&hslot->lock);
ca065d0c	116	sk_for_each(sk, &hslot->head) {
b6d640c2 PE	117	struct inet_sock *inet = inet_sk(sk);
b6d640c2 PE	118
51d7cccf AV	119	if (!net_eq(sock_net(sk), net))
51d7cccf AV	120	continue;
b6d640c2 PE	121	if (num < s_num)
	122	goto next;
	123	if (!(r->idiag_states & (1 << sk->sk_state)))
	124	goto next;
	125	if (r->sdiag_family != AF_UNSPEC &&
	126	sk->sk_family != r->sdiag_family)
	127	goto next;
	128	if (r->id.idiag_sport != inet->inet_sport &&
	129	r->id.idiag_sport)
	130	goto next;
	131	if (r->id.idiag_dport != inet->inet_dport &&
	132	r->id.idiag_dport)
	133	goto next;
	134
	135	if (sk_diag_dump(sk, skb, cb, r, bc) < 0) {
	136	spin_unlock_bh(&hslot->lock);
	137	goto done;
	138	}
	139	next:
	140	num++;
	141	}
	142	spin_unlock_bh(&hslot->lock);
	143	}
	144	done:
	145	cb->args[0] = slot;
	146	cb->args[1] = num;
52b7c59b PE	147	}
	148
	149	static void udp_diag_dump(struct sk_buff skb, struct netlink_callback cb,
34160ea3	150	const struct inet_diag_req_v2 r, struct nlattr bc)
52b7c59b PE	151	{
	152	udp_dump(&udp_table, skb, cb, r, bc);
	153	}
	154
	155	static int udp_diag_dump_one(struct sk_buff in_skb, const struct nlmsghdr nlh,
34160ea3	156	const struct inet_diag_req_v2 *req)
52b7c59b PE	157	{
	158	return udp_dump_one(&udp_table, in_skb, nlh, req);
	159	}
	160
62ad6fcd SW	161	static void udp_diag_get_info(struct sock sk, struct inet_diag_msg r,
	162	void *info)
	163	{
	164	r->idiag_rqueue = sk_rmem_alloc_get(sk);
	165	r->idiag_wqueue = sk_wmem_alloc_get(sk);
	166	}
	167
52b7c59b PE	168	static const struct inet_diag_handler udp_diag_handler = {
	169	.dump = udp_diag_dump,
	170	.dump_one = udp_diag_dump_one,
62ad6fcd	171	.idiag_get_info = udp_diag_get_info,
52b7c59b	172	.idiag_type = IPPROTO_UDP,
3fd22af8	173	.idiag_info_size = 0,
52b7c59b PE	174	};
	175
	176	static void udplite_diag_dump(struct sk_buff skb, struct netlink_callback cb,
34160ea3 ED	177	const struct inet_diag_req_v2 *r,
34160ea3 ED	178	struct nlattr *bc)
52b7c59b PE	179	{
	180	udp_dump(&udplite_table, skb, cb, r, bc);
	181	}
	182
	183	static int udplite_diag_dump_one(struct sk_buff in_skb, const struct nlmsghdr nlh,
34160ea3	184	const struct inet_diag_req_v2 *req)
52b7c59b PE	185	{
	186	return udp_dump_one(&udplite_table, in_skb, nlh, req);
	187	}
	188
	189	static const struct inet_diag_handler udplite_diag_handler = {
	190	.dump = udplite_diag_dump,
	191	.dump_one = udplite_diag_dump_one,
62ad6fcd	192	.idiag_get_info = udp_diag_get_info,
52b7c59b	193	.idiag_type = IPPROTO_UDPLITE,
3fd22af8	194	.idiag_info_size = 0,
52b7c59b PE	195	};
	196
	197	static int __init udp_diag_init(void)
	198	{
	199	int err;
	200
	201	err = inet_diag_register(&udp_diag_handler);
	202	if (err)
	203	goto out;
	204	err = inet_diag_register(&udplite_diag_handler);
	205	if (err)
	206	goto out_lite;
	207	out:
	208	return err;
	209	out_lite:
	210	inet_diag_unregister(&udp_diag_handler);
	211	goto out;
	212	}
	213
	214	static void __exit udp_diag_exit(void)
	215	{
	216	inet_diag_unregister(&udplite_diag_handler);
	217	inet_diag_unregister(&udp_diag_handler);
	218	}
	219
	220	module_init(udp_diag_init);
	221	module_exit(udp_diag_exit);
	222	MODULE_LICENSE("GPL");
aec8dc62 PE	223	MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-17 /* AF_INET - IPPROTO_UDP */);
aec8dc62 PE	224	MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-136 /* AF_INET - IPPROTO_UDPLITE */);