[mirror_ubuntu-artful-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, 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).ssk),
			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, struct inet_diag_req_v2 *req)
{
	int err = -EINVAL;
	struct sock *sk;
	struct sk_buff *rep;
	struct net *net = sock_net(in_skb->sk);

	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);
#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);
#endif
	else
		goto out_nosk;

	err = -ENOENT;
	if (sk == NULL)
		goto out_nosk;

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

	err = -ENOMEM;
	rep = alloc_skb(NLMSG_SPACE((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).ssk),
			   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,
		struct inet_diag_req_v2 *r, struct nlattr *bc)
{
	int num, s_num, slot, s_slot;
	struct net *net = sock_net(skb->sk);

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

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

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

		spin_lock_bh(&hslot->lock);
		sk_nulls_for_each(sk, node, &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,
		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,
		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,
};

static void udplite_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
		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,
		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,
};

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,
c8991362	21	struct netlink_callback cb, struct inet_diag_req_v2 req,
b6d640c2 PE	22	struct nlattr *bc)
	23	{
	24	if (!inet_diag_bc_sk(bc, sk))
	25	return 0;
	26
d06ca956 EB	27	return inet_sk_diag_fill(sk, NULL, skb, req,
d06ca956 EB	28	sk_user_ns(NETLINK_CB(cb->skb).ssk),
15e47304	29	NETLINK_CB(cb->skb).portid,
b6d640c2 PE	30	cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
	31	}
	32
52b7c59b	33	static int udp_dump_one(struct udp_table tbl, struct sk_buff in_skb,
c8991362	34	const struct nlmsghdr nlh, struct inet_diag_req_v2 req)
52b7c59b	35	{
a925aa00 PE	36	int err = -EINVAL;
	37	struct sock *sk;
	38	struct sk_buff *rep;
51d7cccf	39	struct net *net = sock_net(in_skb->sk);
a925aa00 PE	40
a925aa00 PE	41	if (req->sdiag_family == AF_INET)
51d7cccf	42	sk = __udp4_lib_lookup(net,
a925aa00 PE	43	req->id.idiag_src[0], req->id.idiag_sport,
	44	req->id.idiag_dst[0], req->id.idiag_dport,
	45	req->id.idiag_if, tbl);
86e62ad6	46	#if IS_ENABLED(CONFIG_IPV6)
a925aa00	47	else if (req->sdiag_family == AF_INET6)
51d7cccf	48	sk = __udp6_lib_lookup(net,
a925aa00 PE	49	(struct in6_addr *)req->id.idiag_src,
	50	req->id.idiag_sport,
	51	(struct in6_addr *)req->id.idiag_dst,
	52	req->id.idiag_dport,
	53	req->id.idiag_if, tbl);
86e62ad6	54	#endif
a925aa00 PE	55	else
	56	goto out_nosk;
	57
	58	err = -ENOENT;
	59	if (sk == NULL)
	60	goto out_nosk;
	61
f65c1b53	62	err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
a925aa00 PE	63	if (err)
	64	goto out;
	65
	66	err = -ENOMEM;
	67	rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
	68	sizeof(struct inet_diag_meminfo) +
	69	64)), GFP_KERNEL);
	70	if (!rep)
	71	goto out;
	72
	73	err = inet_sk_diag_fill(sk, NULL, rep, req,
d06ca956	74	sk_user_ns(NETLINK_CB(in_skb).ssk),
15e47304	75	NETLINK_CB(in_skb).portid,
a925aa00 PE	76	nlh->nlmsg_seq, 0, nlh);
	77	if (err < 0) {
	78	WARN_ON(err == -EMSGSIZE);
	79	kfree_skb(rep);
	80	goto out;
	81	}
15e47304	82	err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
a925aa00 PE	83	MSG_DONTWAIT);
	84	if (err > 0)
	85	err = 0;
	86	out:
	87	if (sk)
	88	sock_put(sk);
	89	out_nosk:
	90	return err;
52b7c59b PE	91	}
	92
	93	static void udp_dump(struct udp_table table, struct sk_buff skb, struct netlink_callback *cb,
c8991362	94	struct inet_diag_req_v2 r, struct nlattr bc)
52b7c59b	95	{
b6d640c2	96	int num, s_num, slot, s_slot;
51d7cccf	97	struct net *net = sock_net(skb->sk);
b6d640c2 PE	98
	99	s_slot = cb->args[0];
	100	num = s_num = cb->args[1];
	101
	102	for (slot = s_slot; slot <= table->mask; num = s_num = 0, slot++) {
	103	struct sock *sk;
	104	struct hlist_nulls_node *node;
	105	struct udp_hslot *hslot = &table->hash[slot];
	106
	107	if (hlist_nulls_empty(&hslot->head))
	108	continue;
	109
	110	spin_lock_bh(&hslot->lock);
	111	sk_nulls_for_each(sk, node, &hslot->head) {
	112	struct inet_sock *inet = inet_sk(sk);
	113
51d7cccf AV	114	if (!net_eq(sock_net(sk), net))
51d7cccf AV	115	continue;
b6d640c2 PE	116	if (num < s_num)
	117	goto next;
	118	if (!(r->idiag_states & (1 << sk->sk_state)))
	119	goto next;
	120	if (r->sdiag_family != AF_UNSPEC &&
	121	sk->sk_family != r->sdiag_family)
	122	goto next;
	123	if (r->id.idiag_sport != inet->inet_sport &&
	124	r->id.idiag_sport)
	125	goto next;
	126	if (r->id.idiag_dport != inet->inet_dport &&
	127	r->id.idiag_dport)
	128	goto next;
	129
	130	if (sk_diag_dump(sk, skb, cb, r, bc) < 0) {
	131	spin_unlock_bh(&hslot->lock);
	132	goto done;
	133	}
	134	next:
	135	num++;
	136	}
	137	spin_unlock_bh(&hslot->lock);
	138	}
	139	done:
	140	cb->args[0] = slot;
	141	cb->args[1] = num;
52b7c59b PE	142	}
	143
	144	static void udp_diag_dump(struct sk_buff skb, struct netlink_callback cb,
c8991362	145	struct inet_diag_req_v2 r, struct nlattr bc)
52b7c59b PE	146	{
	147	udp_dump(&udp_table, skb, cb, r, bc);
	148	}
	149
	150	static int udp_diag_dump_one(struct sk_buff in_skb, const struct nlmsghdr nlh,
c8991362	151	struct inet_diag_req_v2 *req)
52b7c59b PE	152	{
	153	return udp_dump_one(&udp_table, in_skb, nlh, req);
	154	}
	155
62ad6fcd SW	156	static void udp_diag_get_info(struct sock sk, struct inet_diag_msg r,
	157	void *info)
	158	{
	159	r->idiag_rqueue = sk_rmem_alloc_get(sk);
	160	r->idiag_wqueue = sk_wmem_alloc_get(sk);
	161	}
	162
52b7c59b PE	163	static const struct inet_diag_handler udp_diag_handler = {
	164	.dump = udp_diag_dump,
	165	.dump_one = udp_diag_dump_one,
62ad6fcd	166	.idiag_get_info = udp_diag_get_info,
52b7c59b PE	167	.idiag_type = IPPROTO_UDP,
	168	};
	169
	170	static void udplite_diag_dump(struct sk_buff skb, struct netlink_callback cb,
c8991362	171	struct inet_diag_req_v2 r, struct nlattr bc)
52b7c59b PE	172	{
	173	udp_dump(&udplite_table, skb, cb, r, bc);
	174	}
	175
	176	static int udplite_diag_dump_one(struct sk_buff in_skb, const struct nlmsghdr nlh,
c8991362	177	struct inet_diag_req_v2 *req)
52b7c59b PE	178	{
	179	return udp_dump_one(&udplite_table, in_skb, nlh, req);
	180	}
	181
	182	static const struct inet_diag_handler udplite_diag_handler = {
	183	.dump = udplite_diag_dump,
	184	.dump_one = udplite_diag_dump_one,
62ad6fcd	185	.idiag_get_info = udp_diag_get_info,
52b7c59b PE	186	.idiag_type = IPPROTO_UDPLITE,
	187	};
	188
	189	static int __init udp_diag_init(void)
	190	{
	191	int err;
	192
	193	err = inet_diag_register(&udp_diag_handler);
	194	if (err)
	195	goto out;
	196	err = inet_diag_register(&udplite_diag_handler);
	197	if (err)
	198	goto out_lite;
	199	out:
	200	return err;
	201	out_lite:
	202	inet_diag_unregister(&udp_diag_handler);
	203	goto out;
	204	}
	205
	206	static void __exit udp_diag_exit(void)
	207	{
	208	inet_diag_unregister(&udplite_diag_handler);
	209	inet_diag_unregister(&udp_diag_handler);
	210	}
	211
	212	module_init(udp_diag_init);
	213	module_exit(udp_diag_exit);
	214	MODULE_LICENSE("GPL");
aec8dc62 PE	215	MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-17 /* AF_INET - IPPROTO_UDP */);
aec8dc62 PE	216	MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-136 /* AF_INET - IPPROTO_UDPLITE */);