[linux.git] / net / ipv4 / raw_diag.c

// SPDX-License-Identifier: GPL-2.0-only
#include <linux/module.h>

#include <linux/inet_diag.h>
#include <linux/sock_diag.h>

#include <net/inet_sock.h>
#include <net/raw.h>
#include <net/rawv6.h>

#ifdef pr_fmt
# undef pr_fmt
#endif

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

static struct raw_hashinfo *
raw_get_hashinfo(const struct inet_diag_req_v2 *r)
{
	if (r->sdiag_family == AF_INET) {
		return &raw_v4_hashinfo;
#if IS_ENABLED(CONFIG_IPV6)
	} else if (r->sdiag_family == AF_INET6) {
		return &raw_v6_hashinfo;
#endif
	} else {
		return ERR_PTR(-EINVAL);
	}
}

/*
 * Due to requirement of not breaking user API we can't simply
 * rename @pad field in inet_diag_req_v2 structure, instead
 * use helper to figure it out.
 */

static bool raw_lookup(struct net *net, struct sock *sk,
		       const struct inet_diag_req_v2 *req)
{
	struct inet_diag_req_raw *r = (void *)req;

	if (r->sdiag_family == AF_INET)
		return raw_v4_match(net, sk, r->sdiag_raw_protocol,
				    r->id.idiag_dst[0],
				    r->id.idiag_src[0],
				    r->id.idiag_if, 0);
#if IS_ENABLED(CONFIG_IPV6)
	else
		return raw_v6_match(net, sk, r->sdiag_raw_protocol,
				    (const struct in6_addr *)r->id.idiag_src,
				    (const struct in6_addr *)r->id.idiag_dst,
				    r->id.idiag_if, 0);
#endif
	return false;
}

static struct sock *raw_sock_get(struct net *net, const struct inet_diag_req_v2 *r)
{
	struct raw_hashinfo *hashinfo = raw_get_hashinfo(r);
	struct hlist_head *hlist;
	struct sock *sk;
	int slot;

	if (IS_ERR(hashinfo))
		return ERR_CAST(hashinfo);

	rcu_read_lock();
	for (slot = 0; slot < RAW_HTABLE_SIZE; slot++) {
		hlist = &hashinfo->ht[slot];
		sk_for_each_rcu(sk, hlist) {
			if (raw_lookup(net, sk, r)) {
				/*
				 * Grab it and keep until we fill
				 * diag message to be reported, so
				 * caller should call sock_put then.
				 */
				if (refcount_inc_not_zero(&sk->sk_refcnt))
					goto out_unlock;
			}
		}
	}
	sk = ERR_PTR(-ENOENT);
out_unlock:
	rcu_read_unlock();

	return sk;
}

static int raw_diag_dump_one(struct netlink_callback *cb,
			     const struct inet_diag_req_v2 *r)
{
	struct sk_buff *in_skb = cb->skb;
	struct sk_buff *rep;
	struct sock *sk;
	struct net *net;
	int err;

	net = sock_net(in_skb->sk);
	sk = raw_sock_get(net, r);
	if (IS_ERR(sk))
		return PTR_ERR(sk);

	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) {
		sock_put(sk);
		return -ENOMEM;
	}

	err = inet_sk_diag_fill(sk, NULL, rep, cb, r, 0,
				netlink_net_capable(in_skb, CAP_NET_ADMIN));
	sock_put(sk);

	if (err < 0) {
		kfree_skb(rep);
		return err;
	}

	err = nlmsg_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid);

	return err;
}

static int sk_diag_dump(struct sock *sk, struct sk_buff *skb,
			struct netlink_callback *cb,
			const struct inet_diag_req_v2 *r,
			struct nlattr *bc, bool net_admin)
{
	if (!inet_diag_bc_sk(bc, sk))
		return 0;

	return inet_sk_diag_fill(sk, NULL, skb, cb, r, NLM_F_MULTI, net_admin);
}

static void raw_diag_dump(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 raw_hashinfo *hashinfo = raw_get_hashinfo(r);
	struct net *net = sock_net(skb->sk);
	struct inet_diag_dump_data *cb_data;
	int num, s_num, slot, s_slot;
	struct hlist_head *hlist;
	struct sock *sk = NULL;
	struct nlattr *bc;

	if (IS_ERR(hashinfo))
		return;

	cb_data = cb->data;
	bc = cb_data->inet_diag_nla_bc;
	s_slot = cb->args[0];
	num = s_num = cb->args[1];

	rcu_read_lock();
	for (slot = s_slot; slot < RAW_HTABLE_SIZE; s_num = 0, slot++) {
		num = 0;

		hlist = &hashinfo->ht[slot];
		sk_for_each_rcu(sk, hlist) {
			struct inet_sock *inet = inet_sk(sk);

			if (!net_eq(sock_net(sk), net))
				continue;
			if (num < s_num)
				goto next;
			if (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)
				goto out_unlock;
next:
			num++;
		}
	}

out_unlock:
	rcu_read_unlock();

	cb->args[0] = slot;
	cb->args[1] = num;
}

static void raw_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);
}

#ifdef CONFIG_INET_DIAG_DESTROY
static int raw_diag_destroy(struct sk_buff *in_skb,
			    const struct inet_diag_req_v2 *r)
{
	struct net *net = sock_net(in_skb->sk);
	struct sock *sk;
	int err;

	sk = raw_sock_get(net, r);
	if (IS_ERR(sk))
		return PTR_ERR(sk);
	err = sock_diag_destroy(sk, ECONNABORTED);
	sock_put(sk);
	return err;
}
#endif

static const struct inet_diag_handler raw_diag_handler = {
	.dump			= raw_diag_dump,
	.dump_one		= raw_diag_dump_one,
	.idiag_get_info		= raw_diag_get_info,
	.idiag_type		= IPPROTO_RAW,
	.idiag_info_size	= 0,
#ifdef CONFIG_INET_DIAG_DESTROY
	.destroy		= raw_diag_destroy,
#endif
};

static void __always_unused __check_inet_diag_req_raw(void)
{
	/*
	 * Make sure the two structures are identical,
	 * except the @pad field.
	 */
#define __offset_mismatch(m1, m2)			\
	(offsetof(struct inet_diag_req_v2, m1) !=	\
	 offsetof(struct inet_diag_req_raw, m2))

	BUILD_BUG_ON(sizeof(struct inet_diag_req_v2) !=
		     sizeof(struct inet_diag_req_raw));
	BUILD_BUG_ON(__offset_mismatch(sdiag_family, sdiag_family));
	BUILD_BUG_ON(__offset_mismatch(sdiag_protocol, sdiag_protocol));
	BUILD_BUG_ON(__offset_mismatch(idiag_ext, idiag_ext));
	BUILD_BUG_ON(__offset_mismatch(pad, sdiag_raw_protocol));
	BUILD_BUG_ON(__offset_mismatch(idiag_states, idiag_states));
	BUILD_BUG_ON(__offset_mismatch(id, id));
#undef __offset_mismatch
}

static int __init raw_diag_init(void)
{
	return inet_diag_register(&raw_diag_handler);
}

static void __exit raw_diag_exit(void)
{
	inet_diag_unregister(&raw_diag_handler);
}

module_init(raw_diag_init);
module_exit(raw_diag_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-255 /* AF_INET - IPPROTO_RAW */);
MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10-255 /* AF_INET6 - IPPROTO_RAW */);
Commit	Line	Data
09c434b8	1	// SPDX-License-Identifier: GPL-2.0-only
432490f9 CG	2	#include <linux/module.h>
	3
	4	#include <linux/inet_diag.h>
	5	#include <linux/sock_diag.h>
	6
f8da9779	7	#include <net/inet_sock.h>
432490f9 CG	8	#include <net/raw.h>
	9	#include <net/rawv6.h>
	10
	11	#ifdef pr_fmt
	12	# undef pr_fmt
	13	#endif
	14
	15	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	16
	17	static struct raw_hashinfo *
	18	raw_get_hashinfo(const struct inet_diag_req_v2 *r)
	19	{
	20	if (r->sdiag_family == AF_INET) {
	21	return &raw_v4_hashinfo;
	22	#if IS_ENABLED(CONFIG_IPV6)
	23	} else if (r->sdiag_family == AF_INET6) {
	24	return &raw_v6_hashinfo;
	25	#endif
	26	} else {
432490f9 CG	27	return ERR_PTR(-EINVAL);
	28	}
	29	}
	30
	31	/*
	32	* Due to requirement of not breaking user API we can't simply
	33	* rename @pad field in inet_diag_req_v2 structure, instead
	34	* use helper to figure it out.
	35	*/
	36
ba44f818 ED	37	static bool raw_lookup(struct net net, struct sock sk,
ba44f818 ED	38	const struct inet_diag_req_v2 *req)
432490f9 CG	39	{
432490f9 CG	40	struct inet_diag_req_raw r = (void )req;
432490f9 CG	41
432490f9 CG	42	if (r->sdiag_family == AF_INET)
ba44f818 ED	43	return raw_v4_match(net, sk, r->sdiag_raw_protocol,
	44	r->id.idiag_dst[0],
	45	r->id.idiag_src[0],
	46	r->id.idiag_if, 0);
432490f9 CG	47	#if IS_ENABLED(CONFIG_IPV6)
432490f9 CG	48	else
ba44f818 ED	49	return raw_v6_match(net, sk, r->sdiag_raw_protocol,
	50	(const struct in6_addr *)r->id.idiag_src,
	51	(const struct in6_addr *)r->id.idiag_dst,
	52	r->id.idiag_if, 0);
432490f9	53	#endif
ba44f818	54	return false;
432490f9 CG	55	}
	56
	57	static struct sock raw_sock_get(struct net net, const struct inet_diag_req_v2 *r)
	58	{
	59	struct raw_hashinfo *hashinfo = raw_get_hashinfo(r);
0a78cf72	60	struct hlist_head *hlist;
ba44f818	61	struct sock *sk;
432490f9 CG	62	int slot;
	63
	64	if (IS_ERR(hashinfo))
	65	return ERR_CAST(hashinfo);
	66
0daf07e5	67	rcu_read_lock();
432490f9	68	for (slot = 0; slot < RAW_HTABLE_SIZE; slot++) {
0daf07e5	69	hlist = &hashinfo->ht[slot];
0a78cf72	70	sk_for_each_rcu(sk, hlist) {
ba44f818	71	if (raw_lookup(net, sk, r)) {
432490f9 CG	72	/*
432490f9 CG	73	* Grab it and keep until we fill
0daf07e5	74	* diag message to be reported, so
432490f9	75	* caller should call sock_put then.
432490f9	76	*/
0daf07e5 ED	77	if (refcount_inc_not_zero(&sk->sk_refcnt))
0daf07e5 ED	78	goto out_unlock;
432490f9 CG	79	}
	80	}
	81	}
ba44f818	82	sk = ERR_PTR(-ENOENT);
9999370f	83	out_unlock:
0daf07e5	84	rcu_read_unlock();
432490f9	85
ba44f818	86	return sk;
432490f9 CG	87	}
432490f9 CG	88
5682d393	89	static int raw_diag_dump_one(struct netlink_callback *cb,
432490f9 CG	90	const struct inet_diag_req_v2 *r)
432490f9 CG	91	{
5682d393	92	struct sk_buff *in_skb = cb->skb;
432490f9 CG	93	struct sk_buff *rep;
432490f9 CG	94	struct sock *sk;
5682d393	95	struct net *net;
432490f9 CG	96	int err;
432490f9 CG	97
5682d393	98	net = sock_net(in_skb->sk);
432490f9 CG	99	sk = raw_sock_get(net, r);
	100	if (IS_ERR(sk))
	101	return PTR_ERR(sk);
	102
83f73c5b DY	103	rep = nlmsg_new(nla_total_size(sizeof(struct inet_diag_msg)) +
	104	inet_diag_msg_attrs_size() +
	105	nla_total_size(sizeof(struct inet_diag_meminfo)) + 64,
432490f9 CG	106	GFP_KERNEL);
	107	if (!rep) {
	108	sock_put(sk);
	109	return -ENOMEM;
	110	}
	111
5682d393	112	err = inet_sk_diag_fill(sk, NULL, rep, cb, r, 0,
432490f9 CG	113	netlink_net_capable(in_skb, CAP_NET_ADMIN));
	114	sock_put(sk);
	115
	116	if (err < 0) {
	117	kfree_skb(rep);
	118	return err;
	119	}
	120
01757f53 YD	121	err = nlmsg_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid);
01757f53 YD	122
432490f9 CG	123	return err;
	124	}
	125
	126	static int sk_diag_dump(struct sock sk, struct sk_buff skb,
	127	struct netlink_callback *cb,
	128	const struct inet_diag_req_v2 *r,
	129	struct nlattr *bc, bool net_admin)
	130	{
	131	if (!inet_diag_bc_sk(bc, sk))
	132	return 0;
	133
5682d393	134	return inet_sk_diag_fill(sk, NULL, skb, cb, r, NLM_F_MULTI, net_admin);
432490f9 CG	135	}
	136
	137	static void raw_diag_dump(struct sk_buff skb, struct netlink_callback cb,
0df6d328	138	const struct inet_diag_req_v2 *r)
432490f9 CG	139	{
	140	bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
	141	struct raw_hashinfo *hashinfo = raw_get_hashinfo(r);
	142	struct net *net = sock_net(skb->sk);
0df6d328	143	struct inet_diag_dump_data *cb_data;
432490f9	144	int num, s_num, slot, s_slot;
0a78cf72	145	struct hlist_head *hlist;
432490f9	146	struct sock *sk = NULL;
0df6d328	147	struct nlattr *bc;
432490f9 CG	148
	149	if (IS_ERR(hashinfo))
	150	return;
	151
0df6d328 MKL	152	cb_data = cb->data;
0df6d328 MKL	153	bc = cb_data->inet_diag_nla_bc;
432490f9 CG	154	s_slot = cb->args[0];
	155	num = s_num = cb->args[1];
	156
af185d8c	157	rcu_read_lock();
432490f9 CG	158	for (slot = s_slot; slot < RAW_HTABLE_SIZE; s_num = 0, slot++) {
	159	num = 0;
	160
0daf07e5	161	hlist = &hashinfo->ht[slot];
0a78cf72	162	sk_for_each_rcu(sk, hlist) {
432490f9 CG	163	struct inet_sock *inet = inet_sk(sk);
	164
	165	if (!net_eq(sock_net(sk), net))
	166	continue;
	167	if (num < s_num)
	168	goto next;
	169	if (sk->sk_family != r->sdiag_family)
	170	goto next;
	171	if (r->id.idiag_sport != inet->inet_sport &&
	172	r->id.idiag_sport)
	173	goto next;
	174	if (r->id.idiag_dport != inet->inet_dport &&
	175	r->id.idiag_dport)
	176	goto next;
	177	if (sk_diag_dump(sk, skb, cb, r, bc, net_admin) < 0)
	178	goto out_unlock;
	179	next:
	180	num++;
	181	}
	182	}
	183
	184	out_unlock:
af185d8c	185	rcu_read_unlock();
432490f9 CG	186
	187	cb->args[0] = slot;
	188	cb->args[1] = num;
	189	}
	190
	191	static void raw_diag_get_info(struct sock sk, struct inet_diag_msg r,
	192	void *info)
	193	{
	194	r->idiag_rqueue = sk_rmem_alloc_get(sk);
	195	r->idiag_wqueue = sk_wmem_alloc_get(sk);
	196	}
	197
	198	#ifdef CONFIG_INET_DIAG_DESTROY
	199	static int raw_diag_destroy(struct sk_buff *in_skb,
	200	const struct inet_diag_req_v2 *r)
	201	{
	202	struct net *net = sock_net(in_skb->sk);
	203	struct sock *sk;
cd05a0ec	204	int err;
432490f9 CG	205
	206	sk = raw_sock_get(net, r);
	207	if (IS_ERR(sk))
	208	return PTR_ERR(sk);
cd05a0ec CG	209	err = sock_diag_destroy(sk, ECONNABORTED);
	210	sock_put(sk);
	211	return err;
432490f9 CG	212	}
	213	#endif
	214
	215	static const struct inet_diag_handler raw_diag_handler = {
	216	.dump = raw_diag_dump,
	217	.dump_one = raw_diag_dump_one,
	218	.idiag_get_info = raw_diag_get_info,
	219	.idiag_type = IPPROTO_RAW,
	220	.idiag_info_size = 0,
	221	#ifdef CONFIG_INET_DIAG_DESTROY
	222	.destroy = raw_diag_destroy,
	223	#endif
	224	};
	225
	226	static void __always_unused __check_inet_diag_req_raw(void)
	227	{
	228	/*
	229	* Make sure the two structures are identical,
	230	* except the @pad field.
	231	*/
	232	#define __offset_mismatch(m1, m2) \
	233	(offsetof(struct inet_diag_req_v2, m1) != \
	234	offsetof(struct inet_diag_req_raw, m2))
	235
	236	BUILD_BUG_ON(sizeof(struct inet_diag_req_v2) !=
	237	sizeof(struct inet_diag_req_raw));
	238	BUILD_BUG_ON(__offset_mismatch(sdiag_family, sdiag_family));
	239	BUILD_BUG_ON(__offset_mismatch(sdiag_protocol, sdiag_protocol));
	240	BUILD_BUG_ON(__offset_mismatch(idiag_ext, idiag_ext));
	241	BUILD_BUG_ON(__offset_mismatch(pad, sdiag_raw_protocol));
	242	BUILD_BUG_ON(__offset_mismatch(idiag_states, idiag_states));
	243	BUILD_BUG_ON(__offset_mismatch(id, id));
	244	#undef __offset_mismatch
	245	}
	246
	247	static int __init raw_diag_init(void)
	248	{
	249	return inet_diag_register(&raw_diag_handler);
	250	}
	251
	252	static void __exit raw_diag_exit(void)
	253	{
	254	inet_diag_unregister(&raw_diag_handler);
	255	}
	256
	257	module_init(raw_diag_init);
	258	module_exit(raw_diag_exit);
	259	MODULE_LICENSE("GPL");
	260	MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-255 /* AF_INET - IPPROTO_RAW */);
	261	MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10-255 /* AF_INET6 - IPPROTO_RAW */);