[mirror_ubuntu-kernels.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, req,
			sk_user_ns(NETLINK_CB(cb->skb).sk),
			NETLINK_CB(cb->skb).portid,
			cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh, net_admin);
}

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)
		/* 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, req,
			   sk_user_ns(NETLINK_CB(in_skb).sk),
			   NETLINK_CB(in_skb).portid,
			   nlh->nlmsg_seq, 0, nlh,
			   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 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 = 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 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,
#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
d06ca956	24	return inet_sk_diag_fill(sk, NULL, skb, req,
e32123e5	25	sk_user_ns(NETLINK_CB(cb->skb).sk),
15e47304	26	NETLINK_CB(cb->skb).portid,
d545caca	27	cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh, net_admin);
b6d640c2 PE	28	}
b6d640c2 PE	29
52b7c59b	30	static int udp_dump_one(struct udp_table tbl, struct sk_buff in_skb,
34160ea3 ED	31	const struct nlmsghdr *nlh,
34160ea3 ED	32	const struct inet_diag_req_v2 *req)
52b7c59b	33	{
a925aa00	34	int err = -EINVAL;
ca065d0c	35	struct sock *sk = NULL;
a925aa00	36	struct sk_buff *rep;
51d7cccf	37	struct net *net = sock_net(in_skb->sk);
a925aa00	38
ca065d0c	39	rcu_read_lock();
a925aa00	40	if (req->sdiag_family == AF_INET)
747569b0	41	/* src and dst are swapped for historical reasons */
51d7cccf	42	sk = __udp4_lib_lookup(net,
a925aa00 PE	43	req->id.idiag_src[0], req->id.idiag_sport,
a925aa00 PE	44	req->id.idiag_dst[0], req->id.idiag_dport,
fb74c277	45	req->id.idiag_if, 0, tbl, NULL);
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,
1801b570	53	req->id.idiag_if, 0, tbl, NULL);
86e62ad6	54	#endif
41c6d650	55	if (sk && !refcount_inc_not_zero(&sk->sk_refcnt))
ca065d0c ED	56	sk = NULL;
ca065d0c ED	57	rcu_read_unlock();
a925aa00	58	err = -ENOENT;
51456b29	59	if (!sk)
a925aa00 PE	60	goto out_nosk;
a925aa00 PE	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;
573ce260 H	67	rep = nlmsg_new(sizeof(struct inet_diag_msg) +
	68	sizeof(struct inet_diag_meminfo) + 64,
	69	GFP_KERNEL);
a925aa00 PE	70	if (!rep)
	71	goto out;
	72
	73	err = inet_sk_diag_fill(sk, NULL, rep, req,
e32123e5	74	sk_user_ns(NETLINK_CB(in_skb).sk),
15e47304	75	NETLINK_CB(in_skb).portid,
d545caca LC	76	nlh->nlmsg_seq, 0, nlh,
d545caca LC	77	netlink_net_capable(in_skb, CAP_NET_ADMIN));
a925aa00 PE	78	if (err < 0) {
	79	WARN_ON(err == -EMSGSIZE);
	80	kfree_skb(rep);
	81	goto out;
	82	}
15e47304	83	err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
a925aa00 PE	84	MSG_DONTWAIT);
	85	if (err > 0)
	86	err = 0;
	87	out:
	88	if (sk)
	89	sock_put(sk);
	90	out_nosk:
	91	return err;
52b7c59b PE	92	}
52b7c59b PE	93
34160ea3 ED	94	static void udp_dump(struct udp_table table, struct sk_buff skb,
	95	struct netlink_callback *cb,
	96	const struct inet_diag_req_v2 r, struct nlattr bc)
52b7c59b	97	{
d545caca	98	bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
51d7cccf	99	struct net *net = sock_net(skb->sk);
ca065d0c	100	int num, s_num, slot, s_slot;
b6d640c2 PE	101
	102	s_slot = cb->args[0];
	103	num = s_num = cb->args[1];
	104
86f3cddb	105	for (slot = s_slot; slot <= table->mask; s_num = 0, slot++) {
b6d640c2	106	struct udp_hslot *hslot = &table->hash[slot];
ca065d0c	107	struct sock *sk;
b6d640c2	108
86f3cddb HX	109	num = 0;
86f3cddb HX	110
ca065d0c	111	if (hlist_empty(&hslot->head))
b6d640c2 PE	112	continue;
	113
	114	spin_lock_bh(&hslot->lock);
ca065d0c	115	sk_for_each(sk, &hslot->head) {
b6d640c2 PE	116	struct inet_sock *inet = inet_sk(sk);
b6d640c2 PE	117
51d7cccf AV	118	if (!net_eq(sock_net(sk), net))
51d7cccf AV	119	continue;
b6d640c2 PE	120	if (num < s_num)
	121	goto next;
	122	if (!(r->idiag_states & (1 << sk->sk_state)))
	123	goto next;
	124	if (r->sdiag_family != AF_UNSPEC &&
	125	sk->sk_family != r->sdiag_family)
	126	goto next;
	127	if (r->id.idiag_sport != inet->inet_sport &&
	128	r->id.idiag_sport)
	129	goto next;
	130	if (r->id.idiag_dport != inet->inet_dport &&
	131	r->id.idiag_dport)
	132	goto next;
	133
d545caca	134	if (sk_diag_dump(sk, skb, cb, r, bc, net_admin) < 0) {
b6d640c2 PE	135	spin_unlock_bh(&hslot->lock);
	136	goto done;
	137	}
	138	next:
	139	num++;
	140	}
	141	spin_unlock_bh(&hslot->lock);
	142	}
	143	done:
	144	cb->args[0] = slot;
	145	cb->args[1] = num;
52b7c59b PE	146	}
	147
	148	static void udp_diag_dump(struct sk_buff skb, struct netlink_callback cb,
34160ea3	149	const struct inet_diag_req_v2 r, struct nlattr bc)
52b7c59b PE	150	{
	151	udp_dump(&udp_table, skb, cb, r, bc);
	152	}
	153
	154	static int udp_diag_dump_one(struct sk_buff in_skb, const struct nlmsghdr nlh,
34160ea3	155	const struct inet_diag_req_v2 *req)
52b7c59b PE	156	{
	157	return udp_dump_one(&udp_table, in_skb, nlh, req);
	158	}
	159
62ad6fcd SW	160	static void udp_diag_get_info(struct sock sk, struct inet_diag_msg r,
	161	void *info)
	162	{
6c206b20	163	r->idiag_rqueue = udp_rqueue_get(sk);
62ad6fcd SW	164	r->idiag_wqueue = sk_wmem_alloc_get(sk);
	165	}
	166
5d77dca8 DA	167	#ifdef CONFIG_INET_DIAG_DESTROY
	168	static int __udp_diag_destroy(struct sk_buff *in_skb,
	169	const struct inet_diag_req_v2 *req,
	170	struct udp_table *tbl)
	171	{
	172	struct net *net = sock_net(in_skb->sk);
	173	struct sock *sk;
	174	int err;
	175
	176	rcu_read_lock();
	177
	178	if (req->sdiag_family == AF_INET)
	179	sk = __udp4_lib_lookup(net,
	180	req->id.idiag_dst[0], req->id.idiag_dport,
	181	req->id.idiag_src[0], req->id.idiag_sport,
fb74c277	182	req->id.idiag_if, 0, tbl, NULL);
5d77dca8 DA	183	#if IS_ENABLED(CONFIG_IPV6)
	184	else if (req->sdiag_family == AF_INET6) {
	185	if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
	186	ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
	187	sk = __udp4_lib_lookup(net,
f95bf346 LC	188	req->id.idiag_dst[3], req->id.idiag_dport,
f95bf346 LC	189	req->id.idiag_src[3], req->id.idiag_sport,
fb74c277	190	req->id.idiag_if, 0, tbl, NULL);
5d77dca8 DA	191
	192	else
	193	sk = __udp6_lib_lookup(net,
	194	(struct in6_addr *)req->id.idiag_dst,
	195	req->id.idiag_dport,
	196	(struct in6_addr *)req->id.idiag_src,
	197	req->id.idiag_sport,
1801b570	198	req->id.idiag_if, 0, tbl, NULL);
5d77dca8 DA	199	}
	200	#endif
	201	else {
	202	rcu_read_unlock();
	203	return -EINVAL;
	204	}
	205
41c6d650	206	if (sk && !refcount_inc_not_zero(&sk->sk_refcnt))
5d77dca8 DA	207	sk = NULL;
	208
	209	rcu_read_unlock();
	210
	211	if (!sk)
	212	return -ENOENT;
	213
	214	if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
	215	sock_put(sk);
	216	return -ENOENT;
	217	}
	218
	219	err = sock_diag_destroy(sk, ECONNABORTED);
	220
	221	sock_put(sk);
	222
	223	return err;
	224	}
	225
	226	static int udp_diag_destroy(struct sk_buff *in_skb,
	227	const struct inet_diag_req_v2 *req)
	228	{
	229	return __udp_diag_destroy(in_skb, req, &udp_table);
	230	}
	231
	232	static int udplite_diag_destroy(struct sk_buff *in_skb,
	233	const struct inet_diag_req_v2 *req)
	234	{
	235	return __udp_diag_destroy(in_skb, req, &udplite_table);
	236	}
	237
	238	#endif
	239
52b7c59b PE	240	static const struct inet_diag_handler udp_diag_handler = {
	241	.dump = udp_diag_dump,
	242	.dump_one = udp_diag_dump_one,
62ad6fcd	243	.idiag_get_info = udp_diag_get_info,
52b7c59b	244	.idiag_type = IPPROTO_UDP,
3fd22af8	245	.idiag_info_size = 0,
5d77dca8 DA	246	#ifdef CONFIG_INET_DIAG_DESTROY
	247	.destroy = udp_diag_destroy,
	248	#endif
52b7c59b PE	249	};
	250
	251	static void udplite_diag_dump(struct sk_buff skb, struct netlink_callback cb,
34160ea3 ED	252	const struct inet_diag_req_v2 *r,
34160ea3 ED	253	struct nlattr *bc)
52b7c59b PE	254	{
	255	udp_dump(&udplite_table, skb, cb, r, bc);
	256	}
	257
	258	static int udplite_diag_dump_one(struct sk_buff in_skb, const struct nlmsghdr nlh,
34160ea3	259	const struct inet_diag_req_v2 *req)
52b7c59b PE	260	{
	261	return udp_dump_one(&udplite_table, in_skb, nlh, req);
	262	}
	263
	264	static const struct inet_diag_handler udplite_diag_handler = {
	265	.dump = udplite_diag_dump,
	266	.dump_one = udplite_diag_dump_one,
62ad6fcd	267	.idiag_get_info = udp_diag_get_info,
52b7c59b	268	.idiag_type = IPPROTO_UDPLITE,
3fd22af8	269	.idiag_info_size = 0,
5d77dca8 DA	270	#ifdef CONFIG_INET_DIAG_DESTROY
	271	.destroy = udplite_diag_destroy,
	272	#endif
52b7c59b PE	273	};
	274
	275	static int __init udp_diag_init(void)
	276	{
	277	int err;
	278
	279	err = inet_diag_register(&udp_diag_handler);
	280	if (err)
	281	goto out;
	282	err = inet_diag_register(&udplite_diag_handler);
	283	if (err)
	284	goto out_lite;
	285	out:
	286	return err;
	287	out_lite:
	288	inet_diag_unregister(&udp_diag_handler);
	289	goto out;
	290	}
	291
	292	static void __exit udp_diag_exit(void)
	293	{
	294	inet_diag_unregister(&udplite_diag_handler);
	295	inet_diag_unregister(&udp_diag_handler);
	296	}
	297
	298	module_init(udp_diag_init);
	299	module_exit(udp_diag_exit);
	300	MODULE_LICENSE("GPL");
aec8dc62 PE	301	MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-17 /* AF_INET - IPPROTO_UDP */);
aec8dc62 PE	302	MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-136 /* AF_INET - IPPROTO_UDPLITE */);