[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 = -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)
		/* 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(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, cb, req, 0,
				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 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,
			      struct nlattr *bc)
{
	udp_dump(&udplite_table, skb, cb, r, bc);
}

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;
a925aa00	33	int err = -EINVAL;
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;
573ce260 H	66	rep = nlmsg_new(sizeof(struct inet_diag_msg) +
	67	sizeof(struct inet_diag_meminfo) + 64,
	68	GFP_KERNEL);
a925aa00 PE	69	if (!rep)
	70	goto out;
	71
5682d393 MKL	72	err = inet_sk_diag_fill(sk, NULL, rep, cb, req, 0,
5682d393 MKL	73	netlink_net_capable(in_skb, CAP_NET_ADMIN));
a925aa00 PE	74	if (err < 0) {
	75	WARN_ON(err == -EMSGSIZE);
	76	kfree_skb(rep);
	77	goto out;
	78	}
15e47304	79	err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
a925aa00 PE	80	MSG_DONTWAIT);
	81	if (err > 0)
	82	err = 0;
	83	out:
	84	if (sk)
	85	sock_put(sk);
	86	out_nosk:
	87	return err;
52b7c59b PE	88	}
52b7c59b PE	89
34160ea3 ED	90	static void udp_dump(struct udp_table table, struct sk_buff skb,
	91	struct netlink_callback *cb,
	92	const struct inet_diag_req_v2 r, struct nlattr bc)
52b7c59b	93	{
d545caca	94	bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
51d7cccf	95	struct net *net = sock_net(skb->sk);
ca065d0c	96	int num, s_num, slot, s_slot;
b6d640c2 PE	97
	98	s_slot = cb->args[0];
	99	num = s_num = cb->args[1];
	100
86f3cddb	101	for (slot = s_slot; slot <= table->mask; s_num = 0, slot++) {
b6d640c2	102	struct udp_hslot *hslot = &table->hash[slot];
ca065d0c	103	struct sock *sk;
b6d640c2	104
86f3cddb HX	105	num = 0;
86f3cddb HX	106
ca065d0c	107	if (hlist_empty(&hslot->head))
b6d640c2 PE	108	continue;
	109
	110	spin_lock_bh(&hslot->lock);
ca065d0c	111	sk_for_each(sk, &hslot->head) {
b6d640c2 PE	112	struct inet_sock *inet = inet_sk(sk);
b6d640c2 PE	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
d545caca	130	if (sk_diag_dump(sk, skb, cb, r, bc, net_admin) < 0) {
b6d640c2 PE	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,
34160ea3	145	const struct inet_diag_req_v2 r, struct nlattr bc)
52b7c59b PE	146	{
	147	udp_dump(&udp_table, skb, cb, r, bc);
	148	}
	149
5682d393	150	static int udp_diag_dump_one(struct netlink_callback *cb,
34160ea3	151	const struct inet_diag_req_v2 *req)
52b7c59b	152	{
5682d393	153	return udp_dump_one(&udp_table, cb, req);
52b7c59b PE	154	}
52b7c59b PE	155
62ad6fcd SW	156	static void udp_diag_get_info(struct sock sk, struct inet_diag_msg r,
	157	void *info)
	158	{
6c206b20	159	r->idiag_rqueue = udp_rqueue_get(sk);
62ad6fcd SW	160	r->idiag_wqueue = sk_wmem_alloc_get(sk);
	161	}
	162
5d77dca8 DA	163	#ifdef CONFIG_INET_DIAG_DESTROY
	164	static int __udp_diag_destroy(struct sk_buff *in_skb,
	165	const struct inet_diag_req_v2 *req,
	166	struct udp_table *tbl)
	167	{
	168	struct net *net = sock_net(in_skb->sk);
	169	struct sock *sk;
	170	int err;
	171
	172	rcu_read_lock();
	173
	174	if (req->sdiag_family == AF_INET)
	175	sk = __udp4_lib_lookup(net,
	176	req->id.idiag_dst[0], req->id.idiag_dport,
	177	req->id.idiag_src[0], req->id.idiag_sport,
fb74c277	178	req->id.idiag_if, 0, tbl, NULL);
5d77dca8 DA	179	#if IS_ENABLED(CONFIG_IPV6)
	180	else if (req->sdiag_family == AF_INET6) {
	181	if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
	182	ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
	183	sk = __udp4_lib_lookup(net,
f95bf346 LC	184	req->id.idiag_dst[3], req->id.idiag_dport,
f95bf346 LC	185	req->id.idiag_src[3], req->id.idiag_sport,
fb74c277	186	req->id.idiag_if, 0, tbl, NULL);
5d77dca8 DA	187
	188	else
	189	sk = __udp6_lib_lookup(net,
	190	(struct in6_addr *)req->id.idiag_dst,
	191	req->id.idiag_dport,
	192	(struct in6_addr *)req->id.idiag_src,
	193	req->id.idiag_sport,
1801b570	194	req->id.idiag_if, 0, tbl, NULL);
5d77dca8 DA	195	}
	196	#endif
	197	else {
	198	rcu_read_unlock();
	199	return -EINVAL;
	200	}
	201
41c6d650	202	if (sk && !refcount_inc_not_zero(&sk->sk_refcnt))
5d77dca8 DA	203	sk = NULL;
	204
	205	rcu_read_unlock();
	206
	207	if (!sk)
	208	return -ENOENT;
	209
	210	if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
	211	sock_put(sk);
	212	return -ENOENT;
	213	}
	214
	215	err = sock_diag_destroy(sk, ECONNABORTED);
	216
	217	sock_put(sk);
	218
	219	return err;
	220	}
	221
	222	static int udp_diag_destroy(struct sk_buff *in_skb,
	223	const struct inet_diag_req_v2 *req)
	224	{
	225	return __udp_diag_destroy(in_skb, req, &udp_table);
	226	}
	227
	228	static int udplite_diag_destroy(struct sk_buff *in_skb,
	229	const struct inet_diag_req_v2 *req)
	230	{
	231	return __udp_diag_destroy(in_skb, req, &udplite_table);
	232	}
	233
	234	#endif
	235
52b7c59b PE	236	static const struct inet_diag_handler udp_diag_handler = {
	237	.dump = udp_diag_dump,
	238	.dump_one = udp_diag_dump_one,
62ad6fcd	239	.idiag_get_info = udp_diag_get_info,
52b7c59b	240	.idiag_type = IPPROTO_UDP,
3fd22af8	241	.idiag_info_size = 0,
5d77dca8 DA	242	#ifdef CONFIG_INET_DIAG_DESTROY
	243	.destroy = udp_diag_destroy,
	244	#endif
52b7c59b PE	245	};
	246
	247	static void udplite_diag_dump(struct sk_buff skb, struct netlink_callback cb,
34160ea3 ED	248	const struct inet_diag_req_v2 *r,
34160ea3 ED	249	struct nlattr *bc)
52b7c59b PE	250	{
	251	udp_dump(&udplite_table, skb, cb, r, bc);
	252	}
	253
5682d393	254	static int udplite_diag_dump_one(struct netlink_callback *cb,
34160ea3	255	const struct inet_diag_req_v2 *req)
52b7c59b	256	{
5682d393	257	return udp_dump_one(&udplite_table, cb, req);
52b7c59b PE	258	}
	259
	260	static const struct inet_diag_handler udplite_diag_handler = {
	261	.dump = udplite_diag_dump,
	262	.dump_one = udplite_diag_dump_one,
62ad6fcd	263	.idiag_get_info = udp_diag_get_info,
52b7c59b	264	.idiag_type = IPPROTO_UDPLITE,
3fd22af8	265	.idiag_info_size = 0,
5d77dca8 DA	266	#ifdef CONFIG_INET_DIAG_DESTROY
	267	.destroy = udplite_diag_destroy,
	268	#endif
52b7c59b PE	269	};
	270
	271	static int __init udp_diag_init(void)
	272	{
	273	int err;
	274
	275	err = inet_diag_register(&udp_diag_handler);
	276	if (err)
	277	goto out;
	278	err = inet_diag_register(&udplite_diag_handler);
	279	if (err)
	280	goto out_lite;
	281	out:
	282	return err;
	283	out_lite:
	284	inet_diag_unregister(&udp_diag_handler);
	285	goto out;
	286	}
	287
	288	static void __exit udp_diag_exit(void)
	289	{
	290	inet_diag_unregister(&udplite_diag_handler);
	291	inet_diag_unregister(&udp_diag_handler);
	292	}
	293
	294	module_init(udp_diag_init);
	295	module_exit(udp_diag_exit);
	296	MODULE_LICENSE("GPL");
aec8dc62 PE	297	MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-17 /* AF_INET - IPPROTO_UDP */);
aec8dc62 PE	298	MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-136 /* AF_INET - IPPROTO_UDPLITE */);