[deliverable/linux.git] / net / netlink / diag.c

#include <linux/module.h>

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

	return nlmsg_end(skb, nlh);

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 netlink_table *tbl = &nl_table[protocol];
	struct nl_portid_hash *hash = &tbl->hash;
	struct net *net = sock_net(skb->sk);
	struct netlink_diag_req *req;
	struct sock *sk;
	int ret = 0, num = 0, i;

	req = nlmsg_data(cb->nlh);

	for (i = 0; i <= hash->mask; i++) {
		sk_for_each(sk, &hash->table[i]) {
			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;
				goto done;
			}

			num++;
		}
	}

	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;
			goto done;
		}
		num++;
	}
done:
	cb->args[0] = num;
	cb->args[1] = protocol;

	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];

	req = nlmsg_data(cb->nlh);

	read_lock(&nl_table_lock);

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

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

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

	read_unlock(&nl_table_lock);

	return skb->len;
}

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,
		};
		return netlink_dump_start(net->diag_nlsk, skb, h, &c);
	} else
		return -EOPNOTSUPP;
}

static const struct sock_diag_handler netlink_diag_handler = {
	.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_LICENSE("GPL");
MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 16 /* AF_NETLINK */);
Commit	Line	Data
eaaa3139 AV	1	#include <linux/module.h>
	2
	3	#include <net/sock.h>
	4	#include <linux/netlink.h>
	5	#include <linux/sock_diag.h>
	6	#include <linux/netlink_diag.h>
	7
	8	#include "af_netlink.h"
	9
	10	static int sk_diag_dump_groups(struct sock sk, struct sk_buff nlskb)
	11	{
	12	struct netlink_sock *nlk = nlk_sk(sk);
	13
	14	if (nlk->groups == NULL)
	15	return 0;
	16
	17	return nla_put(nlskb, NETLINK_DIAG_GROUPS, NLGRPSZ(nlk->ngroups),
	18	nlk->groups);
	19	}
	20
	21	static int sk_diag_fill(struct sock sk, struct sk_buff skb,
	22	struct netlink_diag_req *req,
	23	u32 portid, u32 seq, u32 flags, int sk_ino)
	24	{
	25	struct nlmsghdr *nlh;
	26	struct netlink_diag_msg *rep;
	27	struct netlink_sock *nlk = nlk_sk(sk);
	28
	29	nlh = nlmsg_put(skb, portid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rep),
	30	flags);
	31	if (!nlh)
	32	return -EMSGSIZE;
	33
	34	rep = nlmsg_data(nlh);
	35	rep->ndiag_family = AF_NETLINK;
	36	rep->ndiag_type = sk->sk_type;
	37	rep->ndiag_protocol = sk->sk_protocol;
	38	rep->ndiag_state = sk->sk_state;
	39
	40	rep->ndiag_ino = sk_ino;
	41	rep->ndiag_portid = nlk->portid;
	42	rep->ndiag_dst_portid = nlk->dst_portid;
	43	rep->ndiag_dst_group = nlk->dst_group;
	44	sock_diag_save_cookie(sk, rep->ndiag_cookie);
	45
	46	if ((req->ndiag_show & NDIAG_SHOW_GROUPS) &&
	47	sk_diag_dump_groups(sk, skb))
	48	goto out_nlmsg_trim;
	49
	50	if ((req->ndiag_show & NDIAG_SHOW_MEMINFO) &&
	51	sock_diag_put_meminfo(sk, skb, NETLINK_DIAG_MEMINFO))
	52	goto out_nlmsg_trim;
	53
	54	return nlmsg_end(skb, nlh);
	55
	56	out_nlmsg_trim:
	57	nlmsg_cancel(skb, nlh);
	58	return -EMSGSIZE;
	59	}
	60
	61	static int __netlink_diag_dump(struct sk_buff skb, struct netlink_callback cb,
	62	int protocol, int s_num)
	63	{
	64	struct netlink_table *tbl = &nl_table[protocol];
65	struct nl_portid_hash *hash = &tbl->hash;
66	struct net *net = sock_net(skb->sk);
67	struct netlink_diag_req *req;
68	struct sock *sk;
69	int ret = 0, num = 0, i;
70
71	req = nlmsg_data(cb->nlh);
72
73	for (i = 0; i <= hash->mask; i++) {
74	sk_for_each(sk, &hash->table[i]) {
75	if (!net_eq(sock_net(sk), net))
76	continue;
77	if (num < s_num) {
78	num++;
79	continue;
80	}
81
82	if (sk_diag_fill(sk, skb, req,
83	NETLINK_CB(cb->skb).portid,
84	cb->nlh->nlmsg_seq,
85	NLM_F_MULTI,
86	sock_i_ino(sk)) < 0) {
87	ret = 1;
88	goto done;
89	}
90
91	num++;
92	}
93	}
94
95	sk_for_each_bound(sk, &tbl->mc_list) {
96	if (sk_hashed(sk))
97	continue;
98	if (!net_eq(sock_net(sk), net))
99	continue;
100	if (num < s_num) {
101	num++;
102	continue;
103	}
104
105	if (sk_diag_fill(sk, skb, req,
106	NETLINK_CB(cb->skb).portid,
107	cb->nlh->nlmsg_seq,
108	NLM_F_MULTI,
109	sock_i_ino(sk)) < 0) {
110	ret = 1;
111	goto done;
112	}
113	num++;
114	}
115	done:
116	cb->args[0] = num;
117	cb->args[1] = protocol;
118
119	return ret;
120	}
121
122	static int netlink_diag_dump(struct sk_buff skb, struct netlink_callback cb)
123	{
124	struct netlink_diag_req *req;
125	int s_num = cb->args[0];
126
127	req = nlmsg_data(cb->nlh);
128
129	read_lock(&nl_table_lock);
130
131	if (req->sdiag_protocol == NDIAG_PROTO_ALL) {
132	int i;
133
134	for (i = cb->args[1]; i < MAX_LINKS; i++) {
135	if (__netlink_diag_dump(skb, cb, i, s_num))
136	break;
137	s_num = 0;
138	}
139	} else {
140	if (req->sdiag_protocol >= MAX_LINKS) {
141	read_unlock(&nl_table_lock);
142	return -ENOENT;
143	}
144
145	__netlink_diag_dump(skb, cb, req->sdiag_protocol, s_num);
146	}
147
148	read_unlock(&nl_table_lock);
149
150	return skb->len;
151	}
152
153	static int netlink_diag_handler_dump(struct sk_buff skb, struct nlmsghdr h)
154	{
155	int hdrlen = sizeof(struct netlink_diag_req);
156	struct net *net = sock_net(skb->sk);
157
158	if (nlmsg_len(h) < hdrlen)
159	return -EINVAL;
160
161	if (h->nlmsg_flags & NLM_F_DUMP) {
162	struct netlink_dump_control c = {
163	.dump = netlink_diag_dump,
164	};
165	return netlink_dump_start(net->diag_nlsk, skb, h, &c);
166	} else
167	return -EOPNOTSUPP;
168	}
169
170	static const struct sock_diag_handler netlink_diag_handler = {
171	.family = AF_NETLINK,
172	.dump = netlink_diag_handler_dump,
173	};
174
175	static int __init netlink_diag_init(void)
176	{
177	return sock_diag_register(&netlink_diag_handler);
178	}
179
180	static void __exit netlink_diag_exit(void)
181	{
182	sock_diag_unregister(&netlink_diag_handler);
183	}
184
185	module_init(netlink_diag_init);
186	module_exit(netlink_diag_exit);
187	MODULE_LICENSE("GPL");
188	MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 16 /* AF_NETLINK */);