[linux-block.git] / net / ipv4 / udp_diag.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * udp_diag.c	Module for monitoring UDP transport protocols sockets.
 *
 * Authors:	Pavel Emelyanov, <xemul@parallels.com>
 */


#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, cb, req, NLM_F_MULTI,
				 net_admin);
}

static int udp_dump_one(struct udp_table *tbl,
			struct netlink_callback *cb,
			const struct inet_diag_req_v2 *req)
{
	struct sk_buff *in_skb = cb->skb;
	int err;
	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)
		/* src and dst are swapped for historical reasons */
		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, 0, 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, 0, tbl, NULL);
#endif
	if (sk && !refcount_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(nla_total_size(sizeof(struct inet_diag_msg)) +
			inet_diag_msg_attrs_size() +
			nla_total_size(sizeof(struct inet_diag_meminfo)) + 64,
			GFP_KERNEL);
	if (!rep)
		goto out;

	err = inet_sk_diag_fill(sk, NULL, rep, cb, req, 0,
				netlink_net_capable(in_skb, CAP_NET_ADMIN));
	if (err < 0) {
		WARN_ON(err == -EMSGSIZE);
		kfree_skb(rep);
		goto out;
	}
	err = nlmsg_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid);

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)
{
	bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
	struct net *net = sock_net(skb->sk);
	struct inet_diag_dump_data *cb_data;
	int num, s_num, slot, s_slot;
	struct nlattr *bc;

	cb_data = cb->data;
	bc = cb_data->inet_diag_nla_bc;
	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)
{
	udp_dump(&udp_table, skb, cb, r);
}

static int udp_diag_dump_one(struct netlink_callback *cb,
			     const struct inet_diag_req_v2 *req)
{
	return udp_dump_one(&udp_table, cb, req);
}

static void udp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
		void *info)
{
	r->idiag_rqueue = udp_rqueue_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, 0, 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, 0, 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, 0, tbl, NULL);
	}
#endif
	else {
		rcu_read_unlock();
		return -EINVAL;
	}

	if (sk && !refcount_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)
{
	udp_dump(&udplite_table, skb, cb, r);
}

static int udplite_diag_dump_one(struct netlink_callback *cb,
				 const struct inet_diag_req_v2 *req)
{
	return udp_dump_one(&udplite_table, cb, 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
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
52b7c59b PE	2	/*
	3	* udp_diag.c Module for monitoring UDP transport protocols sockets.
	4	*
	5	* Authors: Pavel Emelyanov, <xemul@parallels.com>
52b7c59b PE	6	*/
	7
	8
	9	#include <linux/module.h>
	10	#include <linux/inet_diag.h>
	11	#include <linux/udp.h>
	12	#include <net/udp.h>
	13	#include <net/udplite.h>
52b7c59b PE	14	#include <linux/sock_diag.h>
52b7c59b PE	15
b6d640c2	16	static int sk_diag_dump(struct sock sk, struct sk_buff skb,
34160ea3 ED	17	struct netlink_callback *cb,
34160ea3 ED	18	const struct inet_diag_req_v2 *req,
d545caca	19	struct nlattr *bc, bool net_admin)
b6d640c2 PE	20	{
	21	if (!inet_diag_bc_sk(bc, sk))
	22	return 0;
	23
5682d393 MKL	24	return inet_sk_diag_fill(sk, NULL, skb, cb, req, NLM_F_MULTI,
5682d393 MKL	25	net_admin);
b6d640c2 PE	26	}
b6d640c2 PE	27
5682d393 MKL	28	static int udp_dump_one(struct udp_table *tbl,
5682d393 MKL	29	struct netlink_callback *cb,
34160ea3	30	const struct inet_diag_req_v2 *req)
52b7c59b	31	{
5682d393	32	struct sk_buff *in_skb = cb->skb;
6e822c2c	33	int err;
ca065d0c	34	struct sock *sk = NULL;
a925aa00	35	struct sk_buff *rep;
51d7cccf	36	struct net *net = sock_net(in_skb->sk);
a925aa00	37
ca065d0c	38	rcu_read_lock();
a925aa00	39	if (req->sdiag_family == AF_INET)
747569b0	40	/* src and dst are swapped for historical reasons */
51d7cccf	41	sk = __udp4_lib_lookup(net,
a925aa00 PE	42	req->id.idiag_src[0], req->id.idiag_sport,
a925aa00 PE	43	req->id.idiag_dst[0], req->id.idiag_dport,
fb74c277	44	req->id.idiag_if, 0, tbl, NULL);
86e62ad6	45	#if IS_ENABLED(CONFIG_IPV6)
a925aa00	46	else if (req->sdiag_family == AF_INET6)
51d7cccf	47	sk = __udp6_lib_lookup(net,
a925aa00 PE	48	(struct in6_addr *)req->id.idiag_src,
	49	req->id.idiag_sport,
	50	(struct in6_addr *)req->id.idiag_dst,
	51	req->id.idiag_dport,
1801b570	52	req->id.idiag_if, 0, tbl, NULL);
86e62ad6	53	#endif
41c6d650	54	if (sk && !refcount_inc_not_zero(&sk->sk_refcnt))
ca065d0c ED	55	sk = NULL;
ca065d0c ED	56	rcu_read_unlock();
a925aa00	57	err = -ENOENT;
51456b29	58	if (!sk)
a925aa00 PE	59	goto out_nosk;
a925aa00 PE	60
f65c1b53	61	err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
a925aa00 PE	62	if (err)
	63	goto out;
	64
	65	err = -ENOMEM;
83f73c5b DY	66	rep = nlmsg_new(nla_total_size(sizeof(struct inet_diag_msg)) +
	67	inet_diag_msg_attrs_size() +
	68	nla_total_size(sizeof(struct inet_diag_meminfo)) + 64,
573ce260	69	GFP_KERNEL);
a925aa00 PE	70	if (!rep)
	71	goto out;
	72
5682d393 MKL	73	err = inet_sk_diag_fill(sk, NULL, rep, cb, req, 0,
5682d393 MKL	74	netlink_net_capable(in_skb, CAP_NET_ADMIN));
a925aa00 PE	75	if (err < 0) {
	76	WARN_ON(err == -EMSGSIZE);
	77	kfree_skb(rep);
	78	goto out;
	79	}
01757f53 YD	80	err = nlmsg_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid);
01757f53 YD	81
a925aa00 PE	82	out:
	83	if (sk)
	84	sock_put(sk);
	85	out_nosk:
	86	return err;
52b7c59b PE	87	}
52b7c59b PE	88
34160ea3 ED	89	static void udp_dump(struct udp_table table, struct sk_buff skb,
34160ea3 ED	90	struct netlink_callback *cb,
0df6d328	91	const struct inet_diag_req_v2 *r)
52b7c59b	92	{
d545caca	93	bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
51d7cccf	94	struct net *net = sock_net(skb->sk);
0df6d328	95	struct inet_diag_dump_data *cb_data;
ca065d0c	96	int num, s_num, slot, s_slot;
0df6d328	97	struct nlattr *bc;
b6d640c2	98
0df6d328 MKL	99	cb_data = cb->data;
0df6d328 MKL	100	bc = cb_data->inet_diag_nla_bc;
b6d640c2 PE	101	s_slot = cb->args[0];
	102	num = s_num = cb->args[1];
	103
86f3cddb	104	for (slot = s_slot; slot <= table->mask; s_num = 0, slot++) {
b6d640c2	105	struct udp_hslot *hslot = &table->hash[slot];
ca065d0c	106	struct sock *sk;
b6d640c2	107
86f3cddb HX	108	num = 0;
86f3cddb HX	109
ca065d0c	110	if (hlist_empty(&hslot->head))
b6d640c2 PE	111	continue;
	112
	113	spin_lock_bh(&hslot->lock);
ca065d0c	114	sk_for_each(sk, &hslot->head) {
b6d640c2 PE	115	struct inet_sock *inet = inet_sk(sk);
b6d640c2 PE	116
51d7cccf AV	117	if (!net_eq(sock_net(sk), net))
51d7cccf AV	118	continue;
b6d640c2 PE	119	if (num < s_num)
	120	goto next;
	121	if (!(r->idiag_states & (1 << sk->sk_state)))
	122	goto next;
	123	if (r->sdiag_family != AF_UNSPEC &&
	124	sk->sk_family != r->sdiag_family)
	125	goto next;
	126	if (r->id.idiag_sport != inet->inet_sport &&
	127	r->id.idiag_sport)
	128	goto next;
	129	if (r->id.idiag_dport != inet->inet_dport &&
	130	r->id.idiag_dport)
	131	goto next;
	132
d545caca	133	if (sk_diag_dump(sk, skb, cb, r, bc, net_admin) < 0) {
b6d640c2 PE	134	spin_unlock_bh(&hslot->lock);
	135	goto done;
	136	}
	137	next:
	138	num++;
	139	}
	140	spin_unlock_bh(&hslot->lock);
	141	}
	142	done:
	143	cb->args[0] = slot;
	144	cb->args[1] = num;
52b7c59b PE	145	}
	146
	147	static void udp_diag_dump(struct sk_buff skb, struct netlink_callback cb,
0df6d328	148	const struct inet_diag_req_v2 *r)
52b7c59b	149	{
0df6d328	150	udp_dump(&udp_table, skb, cb, r);
52b7c59b PE	151	}
52b7c59b PE	152
5682d393	153	static int udp_diag_dump_one(struct netlink_callback *cb,
34160ea3	154	const struct inet_diag_req_v2 *req)
52b7c59b	155	{
5682d393	156	return udp_dump_one(&udp_table, cb, req);
52b7c59b PE	157	}
52b7c59b PE	158
62ad6fcd SW	159	static void udp_diag_get_info(struct sock sk, struct inet_diag_msg r,
	160	void *info)
	161	{
6c206b20	162	r->idiag_rqueue = udp_rqueue_get(sk);
62ad6fcd SW	163	r->idiag_wqueue = sk_wmem_alloc_get(sk);
	164	}
	165
5d77dca8 DA	166	#ifdef CONFIG_INET_DIAG_DESTROY
	167	static int __udp_diag_destroy(struct sk_buff *in_skb,
	168	const struct inet_diag_req_v2 *req,
	169	struct udp_table *tbl)
	170	{
	171	struct net *net = sock_net(in_skb->sk);
	172	struct sock *sk;
	173	int err;
	174
	175	rcu_read_lock();
	176
	177	if (req->sdiag_family == AF_INET)
	178	sk = __udp4_lib_lookup(net,
	179	req->id.idiag_dst[0], req->id.idiag_dport,
	180	req->id.idiag_src[0], req->id.idiag_sport,
fb74c277	181	req->id.idiag_if, 0, tbl, NULL);
5d77dca8 DA	182	#if IS_ENABLED(CONFIG_IPV6)
	183	else if (req->sdiag_family == AF_INET6) {
	184	if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
	185	ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
	186	sk = __udp4_lib_lookup(net,
f95bf346 LC	187	req->id.idiag_dst[3], req->id.idiag_dport,
f95bf346 LC	188	req->id.idiag_src[3], req->id.idiag_sport,
fb74c277	189	req->id.idiag_if, 0, tbl, NULL);
5d77dca8 DA	190
	191	else
	192	sk = __udp6_lib_lookup(net,
	193	(struct in6_addr *)req->id.idiag_dst,
	194	req->id.idiag_dport,
	195	(struct in6_addr *)req->id.idiag_src,
	196	req->id.idiag_sport,
1801b570	197	req->id.idiag_if, 0, tbl, NULL);
5d77dca8 DA	198	}
	199	#endif
	200	else {
	201	rcu_read_unlock();
	202	return -EINVAL;
	203	}
	204
41c6d650	205	if (sk && !refcount_inc_not_zero(&sk->sk_refcnt))
5d77dca8 DA	206	sk = NULL;
	207
	208	rcu_read_unlock();
	209
	210	if (!sk)
	211	return -ENOENT;
	212
	213	if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
	214	sock_put(sk);
	215	return -ENOENT;
	216	}
	217
	218	err = sock_diag_destroy(sk, ECONNABORTED);
	219
	220	sock_put(sk);
	221
	222	return err;
	223	}
	224
	225	static int udp_diag_destroy(struct sk_buff *in_skb,
	226	const struct inet_diag_req_v2 *req)
	227	{
	228	return __udp_diag_destroy(in_skb, req, &udp_table);
	229	}
	230
	231	static int udplite_diag_destroy(struct sk_buff *in_skb,
	232	const struct inet_diag_req_v2 *req)
	233	{
	234	return __udp_diag_destroy(in_skb, req, &udplite_table);
	235	}
	236
	237	#endif
	238
52b7c59b PE	239	static const struct inet_diag_handler udp_diag_handler = {
	240	.dump = udp_diag_dump,
	241	.dump_one = udp_diag_dump_one,
62ad6fcd	242	.idiag_get_info = udp_diag_get_info,
52b7c59b	243	.idiag_type = IPPROTO_UDP,
3fd22af8	244	.idiag_info_size = 0,
5d77dca8 DA	245	#ifdef CONFIG_INET_DIAG_DESTROY
	246	.destroy = udp_diag_destroy,
	247	#endif
52b7c59b PE	248	};
	249
	250	static void udplite_diag_dump(struct sk_buff skb, struct netlink_callback cb,
0df6d328	251	const struct inet_diag_req_v2 *r)
52b7c59b	252	{
0df6d328	253	udp_dump(&udplite_table, skb, cb, r);
52b7c59b PE	254	}
52b7c59b PE	255
5682d393	256	static int udplite_diag_dump_one(struct netlink_callback *cb,
34160ea3	257	const struct inet_diag_req_v2 *req)
52b7c59b	258	{
5682d393	259	return udp_dump_one(&udplite_table, cb, req);
52b7c59b PE	260	}
	261
	262	static const struct inet_diag_handler udplite_diag_handler = {
	263	.dump = udplite_diag_dump,
	264	.dump_one = udplite_diag_dump_one,
62ad6fcd	265	.idiag_get_info = udp_diag_get_info,
52b7c59b	266	.idiag_type = IPPROTO_UDPLITE,
3fd22af8	267	.idiag_info_size = 0,
5d77dca8 DA	268	#ifdef CONFIG_INET_DIAG_DESTROY
	269	.destroy = udplite_diag_destroy,
	270	#endif
52b7c59b PE	271	};
	272
	273	static int __init udp_diag_init(void)
	274	{
	275	int err;
	276
	277	err = inet_diag_register(&udp_diag_handler);
	278	if (err)
	279	goto out;
	280	err = inet_diag_register(&udplite_diag_handler);
	281	if (err)
	282	goto out_lite;
	283	out:
	284	return err;
	285	out_lite:
	286	inet_diag_unregister(&udp_diag_handler);
	287	goto out;
	288	}
	289
	290	static void __exit udp_diag_exit(void)
	291	{
	292	inet_diag_unregister(&udplite_diag_handler);
	293	inet_diag_unregister(&udp_diag_handler);
	294	}
	295
	296	module_init(udp_diag_init);
	297	module_exit(udp_diag_exit);
	298	MODULE_LICENSE("GPL");
aec8dc62 PE	299	MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-17 /* AF_INET - IPPROTO_UDP */);
aec8dc62 PE	300	MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-136 /* AF_INET - IPPROTO_UDPLITE */);