[GitHub/mt8127/android_kernel_alcatel_ttab.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, NETLINK_CB(cb->skb).pid,
			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;

	if (req->sdiag_family == AF_INET)
		sk = __udp4_lib_lookup(&init_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(&init_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,
			   NETLINK_CB(in_skb).pid,
			   nlh->nlmsg_seq, 0, nlh);
	if (err < 0) {
		WARN_ON(err == -EMSGSIZE);
		kfree_skb(rep);
		goto out;
	}
	err = netlink_unicast(sock_diag_nlsk, rep, NETLINK_CB(in_skb).pid,
			      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;

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