[linux-block.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 struct sock *raw_lookup(struct net *net, struct sock *from,
			       const struct inet_diag_req_v2 *req)
{
	struct inet_diag_req_raw *r = (void *)req;
	struct sock *sk = NULL;

	if (r->sdiag_family == AF_INET)
		sk = __raw_v4_lookup(net, from, 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
		sk = __raw_v6_lookup(net, from, 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 sk;
}

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 sock *sk = NULL, *s;
	int slot;

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

	read_lock(&hashinfo->lock);
	for (slot = 0; slot < RAW_HTABLE_SIZE; slot++) {
		sk_for_each(s, &hashinfo->ht[slot]) {
			sk = raw_lookup(net, s, r);
			if (sk) {
				/*
				 * Grab it and keep until we fill
				 * diag meaage to be reported, so
				 * caller should call sock_put then.
				 * We can do that because we're keeping
				 * hashinfo->lock here.
				 */
				sock_hold(sk);
				goto out_unlock;
			}
		}
	}
out_unlock:
	read_unlock(&hashinfo->lock);

	return sk ? sk : ERR_PTR(-ENOENT);
}

static int raw_diag_dump_one(struct sk_buff *in_skb,
			     const struct nlmsghdr *nlh,
			     const struct inet_diag_req_v2 *r)
{
	struct net *net = sock_net(in_skb->sk);
	struct sk_buff *rep;
	struct sock *sk;
	int err;

	sk = raw_sock_get(net, r);
	if (IS_ERR(sk))
		return PTR_ERR(sk);

	rep = nlmsg_new(sizeof(struct inet_diag_msg) +
			sizeof(struct inet_diag_meminfo) + 64,
			GFP_KERNEL);
	if (!rep) {
		sock_put(sk);
		return -ENOMEM;
	}

	err = inet_sk_diag_fill(sk, NULL, rep, r,
				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));
	sock_put(sk);

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

	err = netlink_unicast(net->diag_nlsk, rep,
			      NETLINK_CB(in_skb).portid,
			      MSG_DONTWAIT);
	if (err > 0)
		err = 0;
	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, r,
				 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 void raw_diag_dump(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 raw_hashinfo *hashinfo = raw_get_hashinfo(r);
	struct net *net = sock_net(skb->sk);
	int num, s_num, slot, s_slot;
	struct sock *sk = NULL;

	if (IS_ERR(hashinfo))
		return;

	s_slot = cb->args[0];
	num = s_num = cb->args[1];

	read_lock(&hashinfo->lock);
	for (slot = s_slot; slot < RAW_HTABLE_SIZE; s_num = 0, slot++) {
		num = 0;

		sk_for_each(sk, &hashinfo->ht[slot]) {
			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:
	read_unlock(&hashinfo->lock);

	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
	37	static struct sock raw_lookup(struct net net, struct sock *from,
	38	const struct inet_diag_req_v2 *req)
	39	{
	40	struct inet_diag_req_raw r = (void )req;
	41	struct sock *sk = NULL;
	42
	43	if (r->sdiag_family == AF_INET)
	44	sk = __raw_v4_lookup(net, from, r->sdiag_raw_protocol,
	45	r->id.idiag_dst[0],
	46	r->id.idiag_src[0],
67359930	47	r->id.idiag_if, 0);
432490f9 CG	48	#if IS_ENABLED(CONFIG_IPV6)
	49	else
	50	sk = __raw_v6_lookup(net, from, r->sdiag_raw_protocol,
	51	(const struct in6_addr *)r->id.idiag_src,
	52	(const struct in6_addr *)r->id.idiag_dst,
5108ab4b	53	r->id.idiag_if, 0);
432490f9 CG	54	#endif
	55	return sk;
	56	}
	57
	58	static struct sock raw_sock_get(struct net net, const struct inet_diag_req_v2 *r)
	59	{
	60	struct raw_hashinfo *hashinfo = raw_get_hashinfo(r);
	61	struct sock sk = NULL, s;
	62	int slot;
	63
	64	if (IS_ERR(hashinfo))
	65	return ERR_CAST(hashinfo);
	66
	67	read_lock(&hashinfo->lock);
	68	for (slot = 0; slot < RAW_HTABLE_SIZE; slot++) {
	69	sk_for_each(s, &hashinfo->ht[slot]) {
	70	sk = raw_lookup(net, s, r);
	71	if (sk) {
	72	/*
	73	* Grab it and keep until we fill
	74	* diag meaage to be reported, so
	75	* caller should call sock_put then.
	76	* We can do that because we're keeping
	77	* hashinfo->lock here.
	78	*/
	79	sock_hold(sk);
9999370f	80	goto out_unlock;
432490f9 CG	81	}
	82	}
	83	}
9999370f	84	out_unlock:
432490f9 CG	85	read_unlock(&hashinfo->lock);
	86
	87	return sk ? sk : ERR_PTR(-ENOENT);
	88	}
	89
	90	static int raw_diag_dump_one(struct sk_buff *in_skb,
	91	const struct nlmsghdr *nlh,
	92	const struct inet_diag_req_v2 *r)
	93	{
	94	struct net *net = sock_net(in_skb->sk);
	95	struct sk_buff *rep;
	96	struct sock *sk;
	97	int err;
	98
	99	sk = raw_sock_get(net, r);
	100	if (IS_ERR(sk))
	101	return PTR_ERR(sk);
	102
	103	rep = nlmsg_new(sizeof(struct inet_diag_msg) +
	104	sizeof(struct inet_diag_meminfo) + 64,
	105	GFP_KERNEL);
	106	if (!rep) {
	107	sock_put(sk);
	108	return -ENOMEM;
	109	}
	110
	111	err = inet_sk_diag_fill(sk, NULL, rep, r,
	112	sk_user_ns(NETLINK_CB(in_skb).sk),
	113	NETLINK_CB(in_skb).portid,
	114	nlh->nlmsg_seq, 0, nlh,
	115	netlink_net_capable(in_skb, CAP_NET_ADMIN));
	116	sock_put(sk);
	117
	118	if (err < 0) {
	119	kfree_skb(rep);
	120	return err;
	121	}
	122
	123	err = netlink_unicast(net->diag_nlsk, rep,
	124	NETLINK_CB(in_skb).portid,
	125	MSG_DONTWAIT);
	126	if (err > 0)
	127	err = 0;
	128	return err;
	129	}
	130
	131	static int sk_diag_dump(struct sock sk, struct sk_buff skb,
	132	struct netlink_callback *cb,
	133	const struct inet_diag_req_v2 *r,
	134	struct nlattr *bc, bool net_admin)
	135	{
	136	if (!inet_diag_bc_sk(bc, sk))
	137	return 0;
	138
	139	return inet_sk_diag_fill(sk, NULL, skb, r,
	140	sk_user_ns(NETLINK_CB(cb->skb).sk),
	141	NETLINK_CB(cb->skb).portid,
	142	cb->nlh->nlmsg_seq, NLM_F_MULTI,
	143	cb->nlh, net_admin);
	144	}
	145
	146	static void raw_diag_dump(struct sk_buff skb, struct netlink_callback cb,
	147	const struct inet_diag_req_v2 r, struct nlattr bc)
	148	{
149	bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
150	struct raw_hashinfo *hashinfo = raw_get_hashinfo(r);
151	struct net *net = sock_net(skb->sk);
152	int num, s_num, slot, s_slot;
153	struct sock *sk = NULL;
154
155	if (IS_ERR(hashinfo))
156	return;
157
158	s_slot = cb->args[0];
159	num = s_num = cb->args[1];
160
161	read_lock(&hashinfo->lock);
162	for (slot = s_slot; slot < RAW_HTABLE_SIZE; s_num = 0, slot++) {
163	num = 0;
164
165	sk_for_each(sk, &hashinfo->ht[slot]) {
166	struct inet_sock *inet = inet_sk(sk);
167
168	if (!net_eq(sock_net(sk), net))
169	continue;
170	if (num < s_num)
171	goto next;
172	if (sk->sk_family != r->sdiag_family)
173	goto next;
174	if (r->id.idiag_sport != inet->inet_sport &&
175	r->id.idiag_sport)
176	goto next;
177	if (r->id.idiag_dport != inet->inet_dport &&
178	r->id.idiag_dport)
179	goto next;
180	if (sk_diag_dump(sk, skb, cb, r, bc, net_admin) < 0)
181	goto out_unlock;
182	next:
183	num++;
184	}
185	}
186
187	out_unlock:
188	read_unlock(&hashinfo->lock);
189
190	cb->args[0] = slot;
191	cb->args[1] = num;
192	}
193
194	static void raw_diag_get_info(struct sock sk, struct inet_diag_msg r,
195	void *info)
196	{
197	r->idiag_rqueue = sk_rmem_alloc_get(sk);
198	r->idiag_wqueue = sk_wmem_alloc_get(sk);
199	}
200
201	#ifdef CONFIG_INET_DIAG_DESTROY
202	static int raw_diag_destroy(struct sk_buff *in_skb,
203	const struct inet_diag_req_v2 *r)
204	{
205	struct net *net = sock_net(in_skb->sk);
206	struct sock *sk;
cd05a0ec	207	int err;
432490f9 CG	208
	209	sk = raw_sock_get(net, r);
	210	if (IS_ERR(sk))
	211	return PTR_ERR(sk);
cd05a0ec CG	212	err = sock_diag_destroy(sk, ECONNABORTED);
	213	sock_put(sk);
	214	return err;
432490f9 CG	215	}
	216	#endif
	217
	218	static const struct inet_diag_handler raw_diag_handler = {
	219	.dump = raw_diag_dump,
	220	.dump_one = raw_diag_dump_one,
	221	.idiag_get_info = raw_diag_get_info,
	222	.idiag_type = IPPROTO_RAW,
	223	.idiag_info_size = 0,
	224	#ifdef CONFIG_INET_DIAG_DESTROY
	225	.destroy = raw_diag_destroy,
	226	#endif
	227	};
	228
	229	static void __always_unused __check_inet_diag_req_raw(void)
	230	{
	231	/*
	232	* Make sure the two structures are identical,
	233	* except the @pad field.
	234	*/
	235	#define __offset_mismatch(m1, m2) \
	236	(offsetof(struct inet_diag_req_v2, m1) != \
	237	offsetof(struct inet_diag_req_raw, m2))
	238
	239	BUILD_BUG_ON(sizeof(struct inet_diag_req_v2) !=
	240	sizeof(struct inet_diag_req_raw));
	241	BUILD_BUG_ON(__offset_mismatch(sdiag_family, sdiag_family));
	242	BUILD_BUG_ON(__offset_mismatch(sdiag_protocol, sdiag_protocol));
	243	BUILD_BUG_ON(__offset_mismatch(idiag_ext, idiag_ext));
	244	BUILD_BUG_ON(__offset_mismatch(pad, sdiag_raw_protocol));
	245	BUILD_BUG_ON(__offset_mismatch(idiag_states, idiag_states));
	246	BUILD_BUG_ON(__offset_mismatch(id, id));
	247	#undef __offset_mismatch
	248	}
	249
	250	static int __init raw_diag_init(void)
	251	{
	252	return inet_diag_register(&raw_diag_handler);
	253	}
	254
	255	static void __exit raw_diag_exit(void)
	256	{
	257	inet_diag_unregister(&raw_diag_handler);
	258	}
	259
	260	module_init(raw_diag_init);
	261	module_exit(raw_diag_exit);
	262	MODULE_LICENSE("GPL");
	263	MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-255 /* AF_INET - IPPROTO_RAW */);
	264	MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10-255 /* AF_INET6 - IPPROTO_RAW */);