[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 <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_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;

	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 netlink_table *tbl = &nl_table[protocol];
	struct rhashtable *ht = &tbl->hash;
	const struct bucket_table *htbl = rht_dereference_rcu(ht->tbl, ht);
	struct net *net = sock_net(skb->sk);
	struct netlink_diag_req *req;
	struct netlink_sock *nlsk;
	struct sock *sk;
	int ret = 0, num = 0, i;

	req = nlmsg_data(cb->nlh);

	for (i = 0; i < htbl->size; i++) {
		struct rhash_head *pos;

		rht_for_each_entry_rcu(nlsk, pos, htbl, i, node) {
			sk = (struct sock *)nlsk;

			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);

	rcu_read_lock();
	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);
			rcu_read_unlock();
			return -ENOENT;
		}

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

	read_unlock(&nl_table_lock);
	rcu_read_unlock();

	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>
e341694e	7	#include <linux/rhashtable.h>
eaaa3139 AV	8
	9	#include "af_netlink.h"
	10
	11	static int sk_diag_dump_groups(struct sock sk, struct sk_buff nlskb)
	12	{
	13	struct netlink_sock *nlk = nlk_sk(sk);
	14
	15	if (nlk->groups == NULL)
	16	return 0;
	17
	18	return nla_put(nlskb, NETLINK_DIAG_GROUPS, NLGRPSZ(nlk->ngroups),
	19	nlk->groups);
	20	}
	21
	22	static int sk_diag_fill(struct sock sk, struct sk_buff skb,
	23	struct netlink_diag_req *req,
	24	u32 portid, u32 seq, u32 flags, int sk_ino)
	25	{
	26	struct nlmsghdr *nlh;
	27	struct netlink_diag_msg *rep;
	28	struct netlink_sock *nlk = nlk_sk(sk);
	29
	30	nlh = nlmsg_put(skb, portid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rep),
	31	flags);
	32	if (!nlh)
	33	return -EMSGSIZE;
	34
	35	rep = nlmsg_data(nlh);
	36	rep->ndiag_family = AF_NETLINK;
	37	rep->ndiag_type = sk->sk_type;
	38	rep->ndiag_protocol = sk->sk_protocol;
	39	rep->ndiag_state = sk->sk_state;
	40
	41	rep->ndiag_ino = sk_ino;
	42	rep->ndiag_portid = nlk->portid;
	43	rep->ndiag_dst_portid = nlk->dst_portid;
	44	rep->ndiag_dst_group = nlk->dst_group;
	45	sock_diag_save_cookie(sk, rep->ndiag_cookie);
	46
	47	if ((req->ndiag_show & NDIAG_SHOW_GROUPS) &&
	48	sk_diag_dump_groups(sk, skb))
	49	goto out_nlmsg_trim;
	50
	51	if ((req->ndiag_show & NDIAG_SHOW_MEMINFO) &&
	52	sock_diag_put_meminfo(sk, skb, NETLINK_DIAG_MEMINFO))
	53	goto out_nlmsg_trim;
	54
053c095a JB	55	nlmsg_end(skb, nlh);
053c095a JB	56	return 0;
eaaa3139 AV	57
	58	out_nlmsg_trim:
	59	nlmsg_cancel(skb, nlh);
	60	return -EMSGSIZE;
	61	}
	62
	63	static int __netlink_diag_dump(struct sk_buff skb, struct netlink_callback cb,
	64	int protocol, int s_num)
	65	{
	66	struct netlink_table *tbl = &nl_table[protocol];
e341694e	67	struct rhashtable *ht = &tbl->hash;
c5adde94	68	const struct bucket_table *htbl = rht_dereference_rcu(ht->tbl, ht);
eaaa3139 AV	69	struct net *net = sock_net(skb->sk);
eaaa3139 AV	70	struct netlink_diag_req *req;
e341694e	71	struct netlink_sock *nlsk;
eaaa3139 AV	72	struct sock *sk;
	73	int ret = 0, num = 0, i;
	74
	75	req = nlmsg_data(cb->nlh);
	76
e341694e	77	for (i = 0; i < htbl->size; i++) {
88d6ed15 TG	78	struct rhash_head *pos;
88d6ed15 TG	79
c5adde94	80	rht_for_each_entry_rcu(nlsk, pos, htbl, i, node) {
e341694e TG	81	sk = (struct sock *)nlsk;
e341694e TG	82
eaaa3139 AV	83	if (!net_eq(sock_net(sk), net))
	84	continue;
	85	if (num < s_num) {
	86	num++;
	87	continue;
	88	}
	89
	90	if (sk_diag_fill(sk, skb, req,
	91	NETLINK_CB(cb->skb).portid,
	92	cb->nlh->nlmsg_seq,
	93	NLM_F_MULTI,
	94	sock_i_ino(sk)) < 0) {
	95	ret = 1;
	96	goto done;
	97	}
	98
	99	num++;
	100	}
	101	}
	102
	103	sk_for_each_bound(sk, &tbl->mc_list) {
	104	if (sk_hashed(sk))
	105	continue;
	106	if (!net_eq(sock_net(sk), net))
	107	continue;
	108	if (num < s_num) {
	109	num++;
	110	continue;
	111	}
	112
	113	if (sk_diag_fill(sk, skb, req,
	114	NETLINK_CB(cb->skb).portid,
	115	cb->nlh->nlmsg_seq,
	116	NLM_F_MULTI,
	117	sock_i_ino(sk)) < 0) {
	118	ret = 1;
	119	goto done;
	120	}
	121	num++;
	122	}
	123	done:
	124	cb->args[0] = num;
	125	cb->args[1] = protocol;
	126
	127	return ret;
	128	}
	129
	130	static int netlink_diag_dump(struct sk_buff skb, struct netlink_callback cb)
	131	{
	132	struct netlink_diag_req *req;
	133	int s_num = cb->args[0];
	134
	135	req = nlmsg_data(cb->nlh);
	136
c5adde94	137	rcu_read_lock();
eaaa3139 AV	138	read_lock(&nl_table_lock);
	139
	140	if (req->sdiag_protocol == NDIAG_PROTO_ALL) {
	141	int i;
	142
	143	for (i = cb->args[1]; i < MAX_LINKS; i++) {
	144	if (__netlink_diag_dump(skb, cb, i, s_num))
	145	break;
	146	s_num = 0;
	147	}
	148	} else {
	149	if (req->sdiag_protocol >= MAX_LINKS) {
	150	read_unlock(&nl_table_lock);
c5adde94	151	rcu_read_unlock();
eaaa3139 AV	152	return -ENOENT;
	153	}
	154
	155	__netlink_diag_dump(skb, cb, req->sdiag_protocol, s_num);
	156	}
	157
	158	read_unlock(&nl_table_lock);
c5adde94	159	rcu_read_unlock();
eaaa3139 AV	160
	161	return skb->len;
	162	}
	163
	164	static int netlink_diag_handler_dump(struct sk_buff skb, struct nlmsghdr h)
	165	{
	166	int hdrlen = sizeof(struct netlink_diag_req);
	167	struct net *net = sock_net(skb->sk);
	168
	169	if (nlmsg_len(h) < hdrlen)
	170	return -EINVAL;
	171
	172	if (h->nlmsg_flags & NLM_F_DUMP) {
	173	struct netlink_dump_control c = {
	174	.dump = netlink_diag_dump,
	175	};
	176	return netlink_dump_start(net->diag_nlsk, skb, h, &c);
	177	} else
	178	return -EOPNOTSUPP;
	179	}
	180
	181	static const struct sock_diag_handler netlink_diag_handler = {
	182	.family = AF_NETLINK,
	183	.dump = netlink_diag_handler_dump,
	184	};
	185
	186	static int __init netlink_diag_init(void)
	187	{
	188	return sock_diag_register(&netlink_diag_handler);
	189	}
	190
	191	static void __exit netlink_diag_exit(void)
	192	{
	193	sock_diag_unregister(&netlink_diag_handler);
	194	}
	195
	196	module_init(netlink_diag_init);
	197	module_exit(netlink_diag_exit);
	198	MODULE_LICENSE("GPL");
	199	MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 16 /* AF_NETLINK */);