[linux-2.6-block.git] / net / netlink / diag.c

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

#include <net/sock.h>
#include <linux/netlink.h>
#include <linux/sock_diag.h>
#include <linux/netlink_diag.h>
#include <linux/rhashtable.h>

#include "af_netlink.h"

static int sk_diag_dump_groups(struct sock *sk, struct sk_buff *nlskb)
{
	struct netlink_sock *nlk = nlk_sk(sk);

	if (nlk->groups == NULL)
		return 0;

	return nla_put(nlskb, NETLINK_DIAG_GROUPS, NLGRPSZ(nlk->ngroups),
		       nlk->groups);
}

static int sk_diag_put_flags(struct sock *sk, struct sk_buff *skb)
{
	struct netlink_sock *nlk = nlk_sk(sk);
	u32 flags = 0;

	if (nlk->cb_running)
		flags |= NDIAG_FLAG_CB_RUNNING;
	if (nlk_test_bit(RECV_PKTINFO, sk))
		flags |= NDIAG_FLAG_PKTINFO;
	if (nlk_test_bit(BROADCAST_SEND_ERROR, sk))
		flags |= NDIAG_FLAG_BROADCAST_ERROR;
	if (nlk_test_bit(RECV_NO_ENOBUFS, sk))
		flags |= NDIAG_FLAG_NO_ENOBUFS;
	if (nlk_test_bit(LISTEN_ALL_NSID, sk))
		flags |= NDIAG_FLAG_LISTEN_ALL_NSID;
	if (nlk_test_bit(CAP_ACK, sk))
		flags |= NDIAG_FLAG_CAP_ACK;

	return nla_put_u32(skb, NETLINK_DIAG_FLAGS, flags);
}

static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
			struct netlink_diag_req *req,
			u32 portid, u32 seq, u32 flags, int sk_ino)
{
	struct nlmsghdr *nlh;
	struct netlink_diag_msg *rep;
	struct netlink_sock *nlk = nlk_sk(sk);

	nlh = nlmsg_put(skb, portid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rep),
			flags);
	if (!nlh)
		return -EMSGSIZE;

	rep = nlmsg_data(nlh);
	rep->ndiag_family	= AF_NETLINK;
	rep->ndiag_type		= sk->sk_type;
	rep->ndiag_protocol	= sk->sk_protocol;
	rep->ndiag_state	= sk->sk_state;

	rep->ndiag_ino		= sk_ino;
	rep->ndiag_portid	= nlk->portid;
	rep->ndiag_dst_portid	= nlk->dst_portid;
	rep->ndiag_dst_group	= nlk->dst_group;
	sock_diag_save_cookie(sk, rep->ndiag_cookie);

	if ((req->ndiag_show & NDIAG_SHOW_GROUPS) &&
	    sk_diag_dump_groups(sk, skb))
		goto out_nlmsg_trim;

	if ((req->ndiag_show & NDIAG_SHOW_MEMINFO) &&
	    sock_diag_put_meminfo(sk, skb, NETLINK_DIAG_MEMINFO))
		goto out_nlmsg_trim;

	if ((req->ndiag_show & NDIAG_SHOW_FLAGS) &&
	    sk_diag_put_flags(sk, skb))
		goto out_nlmsg_trim;

	nlmsg_end(skb, nlh);
	return 0;

out_nlmsg_trim:
	nlmsg_cancel(skb, nlh);
	return -EMSGSIZE;
}

static int __netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
				int protocol, int s_num)
{
	struct rhashtable_iter *hti = (void *)cb->args[2];
	struct netlink_table *tbl = &nl_table[protocol];
	struct net *net = sock_net(skb->sk);
	struct netlink_diag_req *req;
	struct netlink_sock *nlsk;
	unsigned long flags;
	struct sock *sk;
	int num = 2;
	int ret = 0;

	req = nlmsg_data(cb->nlh);

	if (s_num > 1)
		goto mc_list;

	num--;

	if (!hti) {
		hti = kmalloc(sizeof(*hti), GFP_KERNEL);
		if (!hti)
			return -ENOMEM;

		cb->args[2] = (long)hti;
	}

	if (!s_num)
		rhashtable_walk_enter(&tbl->hash, hti);

	rhashtable_walk_start(hti);

	while ((nlsk = rhashtable_walk_next(hti))) {
		if (IS_ERR(nlsk)) {
			ret = PTR_ERR(nlsk);
			if (ret == -EAGAIN) {
				ret = 0;
				continue;
			}
			break;
		}

		sk = (struct sock *)nlsk;

		if (!net_eq(sock_net(sk), net))
			continue;

		if (sk_diag_fill(sk, skb, req,
				 NETLINK_CB(cb->skb).portid,
				 cb->nlh->nlmsg_seq,
				 NLM_F_MULTI,
				 sock_i_ino(sk)) < 0) {
			ret = 1;
			break;
		}
	}

	rhashtable_walk_stop(hti);

	if (ret)
		goto done;

	rhashtable_walk_exit(hti);
	num++;

mc_list:
	read_lock_irqsave(&nl_table_lock, flags);
	sk_for_each_bound(sk, &tbl->mc_list) {
		if (sk_hashed(sk))
			continue;
		if (!net_eq(sock_net(sk), net))
			continue;
		if (num < s_num) {
			num++;
			continue;
		}

		if (sk_diag_fill(sk, skb, req,
				 NETLINK_CB(cb->skb).portid,
				 cb->nlh->nlmsg_seq,
				 NLM_F_MULTI,
				 __sock_i_ino(sk)) < 0) {
			ret = 1;
			break;
		}
		num++;
	}
	read_unlock_irqrestore(&nl_table_lock, flags);

done:
	cb->args[0] = num;

	return ret;
}

static int netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
	struct netlink_diag_req *req;
	int s_num = cb->args[0];
	int err = 0;

	req = nlmsg_data(cb->nlh);

	if (req->sdiag_protocol == NDIAG_PROTO_ALL) {
		int i;

		for (i = cb->args[1]; i < MAX_LINKS; i++) {
			err = __netlink_diag_dump(skb, cb, i, s_num);
			if (err)
				break;
			s_num = 0;
		}
		cb->args[1] = i;
	} else {
		if (req->sdiag_protocol >= MAX_LINKS)
			return -ENOENT;

		err = __netlink_diag_dump(skb, cb, req->sdiag_protocol, s_num);
	}

	return err <= 0 ? err : skb->len;
}

static int netlink_diag_dump_done(struct netlink_callback *cb)
{
	struct rhashtable_iter *hti = (void *)cb->args[2];

	if (cb->args[0] == 1)
		rhashtable_walk_exit(hti);

	kfree(hti);

	return 0;
}

static int netlink_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
{
	int hdrlen = sizeof(struct netlink_diag_req);
	struct net *net = sock_net(skb->sk);

	if (nlmsg_len(h) < hdrlen)
		return -EINVAL;

	if (h->nlmsg_flags & NLM_F_DUMP) {
		struct netlink_dump_control c = {
			.dump = netlink_diag_dump,
			.done = netlink_diag_dump_done,
		};
		return netlink_dump_start(net->diag_nlsk, skb, h, &c);
	} else
		return -EOPNOTSUPP;
}

static const struct sock_diag_handler netlink_diag_handler = {
	.owner = THIS_MODULE,
	.family = AF_NETLINK,
	.dump = netlink_diag_handler_dump,
};

static int __init netlink_diag_init(void)
{
	return sock_diag_register(&netlink_diag_handler);
}

static void __exit netlink_diag_exit(void)
{
	sock_diag_unregister(&netlink_diag_handler);
}

module_init(netlink_diag_init);
module_exit(netlink_diag_exit);
MODULE_DESCRIPTION("Netlink-based socket monitoring/diagnostic interface (sock_diag)");
MODULE_LICENSE("GPL");
MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 16 /* AF_NETLINK */);
Commit	Line	Data
09c434b8	1	// SPDX-License-Identifier: GPL-2.0-only
eaaa3139 AV	2	#include <linux/module.h>
	3
	4	#include <net/sock.h>
	5	#include <linux/netlink.h>
	6	#include <linux/sock_diag.h>
	7	#include <linux/netlink_diag.h>
e341694e	8	#include <linux/rhashtable.h>
eaaa3139 AV	9
	10	#include "af_netlink.h"
	11
	12	static int sk_diag_dump_groups(struct sock sk, struct sk_buff nlskb)
	13	{
	14	struct netlink_sock *nlk = nlk_sk(sk);
	15
	16	if (nlk->groups == NULL)
	17	return 0;
	18
	19	return nla_put(nlskb, NETLINK_DIAG_GROUPS, NLGRPSZ(nlk->ngroups),
	20	nlk->groups);
	21	}
	22
457c79e5 AV	23	static int sk_diag_put_flags(struct sock sk, struct sk_buff skb)
	24	{
	25	struct netlink_sock *nlk = nlk_sk(sk);
	26	u32 flags = 0;
	27
	28	if (nlk->cb_running)
	29	flags \|= NDIAG_FLAG_CB_RUNNING;
8fe08d70	30	if (nlk_test_bit(RECV_PKTINFO, sk))
457c79e5	31	flags \|= NDIAG_FLAG_PKTINFO;
8fe08d70	32	if (nlk_test_bit(BROADCAST_SEND_ERROR, sk))
457c79e5	33	flags \|= NDIAG_FLAG_BROADCAST_ERROR;
8fe08d70	34	if (nlk_test_bit(RECV_NO_ENOBUFS, sk))
457c79e5	35	flags \|= NDIAG_FLAG_NO_ENOBUFS;
8fe08d70	36	if (nlk_test_bit(LISTEN_ALL_NSID, sk))
457c79e5	37	flags \|= NDIAG_FLAG_LISTEN_ALL_NSID;
8fe08d70	38	if (nlk_test_bit(CAP_ACK, sk))
457c79e5 AV	39	flags \|= NDIAG_FLAG_CAP_ACK;
	40
	41	return nla_put_u32(skb, NETLINK_DIAG_FLAGS, flags);
	42	}
	43
eaaa3139 AV	44	static int sk_diag_fill(struct sock sk, struct sk_buff skb,
	45	struct netlink_diag_req *req,
	46	u32 portid, u32 seq, u32 flags, int sk_ino)
	47	{
	48	struct nlmsghdr *nlh;
	49	struct netlink_diag_msg *rep;
	50	struct netlink_sock *nlk = nlk_sk(sk);
	51
	52	nlh = nlmsg_put(skb, portid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rep),
	53	flags);
	54	if (!nlh)
	55	return -EMSGSIZE;
	56
	57	rep = nlmsg_data(nlh);
	58	rep->ndiag_family = AF_NETLINK;
	59	rep->ndiag_type = sk->sk_type;
	60	rep->ndiag_protocol = sk->sk_protocol;
	61	rep->ndiag_state = sk->sk_state;
	62
	63	rep->ndiag_ino = sk_ino;
	64	rep->ndiag_portid = nlk->portid;
	65	rep->ndiag_dst_portid = nlk->dst_portid;
	66	rep->ndiag_dst_group = nlk->dst_group;
	67	sock_diag_save_cookie(sk, rep->ndiag_cookie);
	68
	69	if ((req->ndiag_show & NDIAG_SHOW_GROUPS) &&
	70	sk_diag_dump_groups(sk, skb))
	71	goto out_nlmsg_trim;
	72
	73	if ((req->ndiag_show & NDIAG_SHOW_MEMINFO) &&
	74	sock_diag_put_meminfo(sk, skb, NETLINK_DIAG_MEMINFO))
	75	goto out_nlmsg_trim;
	76
457c79e5 AV	77	if ((req->ndiag_show & NDIAG_SHOW_FLAGS) &&
	78	sk_diag_put_flags(sk, skb))
	79	goto out_nlmsg_trim;
	80
053c095a JB	81	nlmsg_end(skb, nlh);
053c095a JB	82	return 0;
eaaa3139 AV	83
	84	out_nlmsg_trim:
	85	nlmsg_cancel(skb, nlh);
	86	return -EMSGSIZE;
	87	}
	88
	89	static int __netlink_diag_dump(struct sk_buff skb, struct netlink_callback cb,
	90	int protocol, int s_num)
	91	{
ad202074	92	struct rhashtable_iter hti = (void )cb->args[2];
eaaa3139	93	struct netlink_table *tbl = &nl_table[protocol];
eaaa3139 AV	94	struct net *net = sock_net(skb->sk);
eaaa3139 AV	95	struct netlink_diag_req *req;
e341694e	96	struct netlink_sock *nlsk;
8d61f926	97	unsigned long flags;
eaaa3139	98	struct sock *sk;
ad202074 HX	99	int num = 2;
ad202074 HX	100	int ret = 0;
eaaa3139 AV	101
	102	req = nlmsg_data(cb->nlh);
	103
ad202074 HX	104	if (s_num > 1)
ad202074 HX	105	goto mc_list;
88d6ed15	106
ad202074	107	num--;
e341694e	108
ad202074 HX	109	if (!hti) {
	110	hti = kmalloc(sizeof(*hti), GFP_KERNEL);
	111	if (!hti)
	112	return -ENOMEM;
	113
	114	cb->args[2] = (long)hti;
	115	}
	116
	117	if (!s_num)
	118	rhashtable_walk_enter(&tbl->hash, hti);
	119
97a6ec4a	120	rhashtable_walk_start(hti);
ad202074 HX	121
	122	while ((nlsk = rhashtable_walk_next(hti))) {
	123	if (IS_ERR(nlsk)) {
	124	ret = PTR_ERR(nlsk);
	125	if (ret == -EAGAIN) {
	126	ret = 0;
eaaa3139 AV	127	continue;
eaaa3139 AV	128	}
ad202074 HX	129	break;
ad202074 HX	130	}
eaaa3139	131
ad202074	132	sk = (struct sock *)nlsk;
eaaa3139	133
ad202074 HX	134	if (!net_eq(sock_net(sk), net))
	135	continue;
	136
	137	if (sk_diag_fill(sk, skb, req,
	138	NETLINK_CB(cb->skb).portid,
	139	cb->nlh->nlmsg_seq,
	140	NLM_F_MULTI,
	141	sock_i_ino(sk)) < 0) {
	142	ret = 1;
	143	break;
eaaa3139 AV	144	}
	145	}
	146
ad202074	147	rhashtable_walk_stop(hti);
97a6ec4a	148
ad202074 HX	149	if (ret)
	150	goto done;
	151
	152	rhashtable_walk_exit(hti);
ad202074 HX	153	num++;
	154
	155	mc_list:
8d61f926	156	read_lock_irqsave(&nl_table_lock, flags);
eaaa3139 AV	157	sk_for_each_bound(sk, &tbl->mc_list) {
	158	if (sk_hashed(sk))
	159	continue;
	160	if (!net_eq(sock_net(sk), net))
	161	continue;
	162	if (num < s_num) {
	163	num++;
	164	continue;
	165	}
	166
	167	if (sk_diag_fill(sk, skb, req,
	168	NETLINK_CB(cb->skb).portid,
	169	cb->nlh->nlmsg_seq,
	170	NLM_F_MULTI,
25a9c8a4	171	__sock_i_ino(sk)) < 0) {
eaaa3139	172	ret = 1;
ad202074	173	break;
eaaa3139 AV	174	}
	175	num++;
	176	}
8d61f926	177	read_unlock_irqrestore(&nl_table_lock, flags);
ad202074	178
eaaa3139 AV	179	done:
eaaa3139 AV	180	cb->args[0] = num;
eaaa3139 AV	181
	182	return ret;
	183	}
	184
	185	static int netlink_diag_dump(struct sk_buff skb, struct netlink_callback cb)
	186	{
	187	struct netlink_diag_req *req;
	188	int s_num = cb->args[0];
ad202074	189	int err = 0;
eaaa3139 AV	190
	191	req = nlmsg_data(cb->nlh);
	192
eaaa3139 AV	193	if (req->sdiag_protocol == NDIAG_PROTO_ALL) {
	194	int i;
	195
	196	for (i = cb->args[1]; i < MAX_LINKS; i++) {
ad202074 HX	197	err = __netlink_diag_dump(skb, cb, i, s_num);
ad202074 HX	198	if (err)
eaaa3139 AV	199	break;
	200	s_num = 0;
	201	}
ad202074	202	cb->args[1] = i;
eaaa3139	203	} else {
93636d1f	204	if (req->sdiag_protocol >= MAX_LINKS)
eaaa3139	205	return -ENOENT;
eaaa3139	206
ad202074	207	err = __netlink_diag_dump(skb, cb, req->sdiag_protocol, s_num);
eaaa3139 AV	208	}
eaaa3139 AV	209
6647b338	210	return err <= 0 ? err : skb->len;
ad202074 HX	211	}
	212
	213	static int netlink_diag_dump_done(struct netlink_callback *cb)
	214	{
	215	struct rhashtable_iter hti = (void )cb->args[2];
	216
	217	if (cb->args[0] == 1)
	218	rhashtable_walk_exit(hti);
eaaa3139	219
ad202074 HX	220	kfree(hti);
	221
	222	return 0;
eaaa3139 AV	223	}
	224
	225	static int netlink_diag_handler_dump(struct sk_buff skb, struct nlmsghdr h)
	226	{
	227	int hdrlen = sizeof(struct netlink_diag_req);
	228	struct net *net = sock_net(skb->sk);
	229
	230	if (nlmsg_len(h) < hdrlen)
	231	return -EINVAL;
	232
	233	if (h->nlmsg_flags & NLM_F_DUMP) {
	234	struct netlink_dump_control c = {
	235	.dump = netlink_diag_dump,
ad202074	236	.done = netlink_diag_dump_done,
eaaa3139 AV	237	};
	238	return netlink_dump_start(net->diag_nlsk, skb, h, &c);
	239	} else
	240	return -EOPNOTSUPP;
	241	}
	242
	243	static const struct sock_diag_handler netlink_diag_handler = {
114b4bb1	244	.owner = THIS_MODULE,
eaaa3139 AV	245	.family = AF_NETLINK,
	246	.dump = netlink_diag_handler_dump,
	247	};
	248
	249	static int __init netlink_diag_init(void)
	250	{
	251	return sock_diag_register(&netlink_diag_handler);
	252	}
	253
	254	static void __exit netlink_diag_exit(void)
	255	{
	256	sock_diag_unregister(&netlink_diag_handler);
	257	}
	258
	259	module_init(netlink_diag_init);
	260	module_exit(netlink_diag_exit);
016b9332	261	MODULE_DESCRIPTION("Netlink-based socket monitoring/diagnostic interface (sock_diag)");
eaaa3139 AV	262	MODULE_LICENSE("GPL");
eaaa3139 AV	263	MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 16 /* AF_NETLINK */);