[linux-2.6-block.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"

#ifdef CONFIG_NETLINK_MMAP
static int sk_diag_put_ring(struct netlink_ring *ring, int nl_type,
			    struct sk_buff *nlskb)
{
	struct netlink_diag_ring ndr;

	ndr.ndr_block_size = ring->pg_vec_pages << PAGE_SHIFT;
	ndr.ndr_block_nr   = ring->pg_vec_len;
	ndr.ndr_frame_size = ring->frame_size;
	ndr.ndr_frame_nr   = ring->frame_max + 1;

	return nla_put(nlskb, nl_type, sizeof(ndr), &ndr);
}

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

	mutex_lock(&nlk->pg_vec_lock);
	ret = sk_diag_put_ring(&nlk->rx_ring, NETLINK_DIAG_RX_RING, nlskb);
	if (!ret)
		ret = sk_diag_put_ring(&nlk->tx_ring, NETLINK_DIAG_TX_RING,
				       nlskb);
	mutex_unlock(&nlk->pg_vec_lock);

	return ret;
}
#else
static int sk_diag_put_rings_cfg(struct sock *sk, struct sk_buff *nlskb)
{
	return 0;
}
#endif

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;

	if ((req->ndiag_show & NDIAG_SHOW_RING_CFG) &&
	    sk_diag_put_rings_cfg(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 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
3dec2246	11	#ifdef CONFIG_NETLINK_MMAP
4ae9fbee PM	12	static int sk_diag_put_ring(struct netlink_ring *ring, int nl_type,
	13	struct sk_buff *nlskb)
	14	{
	15	struct netlink_diag_ring ndr;
	16
	17	ndr.ndr_block_size = ring->pg_vec_pages << PAGE_SHIFT;
	18	ndr.ndr_block_nr = ring->pg_vec_len;
	19	ndr.ndr_frame_size = ring->frame_size;
	20	ndr.ndr_frame_nr = ring->frame_max + 1;
	21
	22	return nla_put(nlskb, nl_type, sizeof(ndr), &ndr);
	23	}
	24
	25	static int sk_diag_put_rings_cfg(struct sock sk, struct sk_buff nlskb)
	26	{
	27	struct netlink_sock *nlk = nlk_sk(sk);
	28	int ret;
	29
	30	mutex_lock(&nlk->pg_vec_lock);
	31	ret = sk_diag_put_ring(&nlk->rx_ring, NETLINK_DIAG_RX_RING, nlskb);
	32	if (!ret)
	33	ret = sk_diag_put_ring(&nlk->tx_ring, NETLINK_DIAG_TX_RING,
	34	nlskb);
	35	mutex_unlock(&nlk->pg_vec_lock);
	36
	37	return ret;
	38	}
3dec2246 DM	39	#else
	40	static int sk_diag_put_rings_cfg(struct sock sk, struct sk_buff nlskb)
	41	{
	42	return 0;
	43	}
	44	#endif
4ae9fbee	45
eaaa3139 AV	46	static int sk_diag_dump_groups(struct sock sk, struct sk_buff nlskb)
	47	{
	48	struct netlink_sock *nlk = nlk_sk(sk);
	49
	50	if (nlk->groups == NULL)
	51	return 0;
	52
	53	return nla_put(nlskb, NETLINK_DIAG_GROUPS, NLGRPSZ(nlk->ngroups),
	54	nlk->groups);
	55	}
	56
	57	static int sk_diag_fill(struct sock sk, struct sk_buff skb,
	58	struct netlink_diag_req *req,
	59	u32 portid, u32 seq, u32 flags, int sk_ino)
	60	{
	61	struct nlmsghdr *nlh;
	62	struct netlink_diag_msg *rep;
	63	struct netlink_sock *nlk = nlk_sk(sk);
	64
	65	nlh = nlmsg_put(skb, portid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rep),
	66	flags);
	67	if (!nlh)
	68	return -EMSGSIZE;
	69
	70	rep = nlmsg_data(nlh);
	71	rep->ndiag_family = AF_NETLINK;
	72	rep->ndiag_type = sk->sk_type;
	73	rep->ndiag_protocol = sk->sk_protocol;
	74	rep->ndiag_state = sk->sk_state;
	75
	76	rep->ndiag_ino = sk_ino;
	77	rep->ndiag_portid = nlk->portid;
	78	rep->ndiag_dst_portid = nlk->dst_portid;
	79	rep->ndiag_dst_group = nlk->dst_group;
	80	sock_diag_save_cookie(sk, rep->ndiag_cookie);
	81
	82	if ((req->ndiag_show & NDIAG_SHOW_GROUPS) &&
	83	sk_diag_dump_groups(sk, skb))
	84	goto out_nlmsg_trim;
	85
	86	if ((req->ndiag_show & NDIAG_SHOW_MEMINFO) &&
	87	sock_diag_put_meminfo(sk, skb, NETLINK_DIAG_MEMINFO))
	88	goto out_nlmsg_trim;
	89
4ae9fbee PM	90	if ((req->ndiag_show & NDIAG_SHOW_RING_CFG) &&
	91	sk_diag_put_rings_cfg(sk, skb))
	92	goto out_nlmsg_trim;
	93
053c095a JB	94	nlmsg_end(skb, nlh);
053c095a JB	95	return 0;
eaaa3139 AV	96
	97	out_nlmsg_trim:
	98	nlmsg_cancel(skb, nlh);
	99	return -EMSGSIZE;
	100	}
	101
	102	static int __netlink_diag_dump(struct sk_buff skb, struct netlink_callback cb,
	103	int protocol, int s_num)
	104	{
	105	struct netlink_table *tbl = &nl_table[protocol];
e341694e	106	struct rhashtable *ht = &tbl->hash;
c5adde94	107	const struct bucket_table *htbl = rht_dereference_rcu(ht->tbl, ht);
eaaa3139 AV	108	struct net *net = sock_net(skb->sk);
eaaa3139 AV	109	struct netlink_diag_req *req;
e341694e	110	struct netlink_sock *nlsk;
eaaa3139 AV	111	struct sock *sk;
	112	int ret = 0, num = 0, i;
	113
	114	req = nlmsg_data(cb->nlh);
	115
e341694e	116	for (i = 0; i < htbl->size; i++) {
88d6ed15 TG	117	struct rhash_head *pos;
88d6ed15 TG	118
c5adde94	119	rht_for_each_entry_rcu(nlsk, pos, htbl, i, node) {
e341694e TG	120	sk = (struct sock *)nlsk;
e341694e TG	121
eaaa3139 AV	122	if (!net_eq(sock_net(sk), net))
	123	continue;
	124	if (num < s_num) {
	125	num++;
	126	continue;
	127	}
	128
	129	if (sk_diag_fill(sk, skb, req,
	130	NETLINK_CB(cb->skb).portid,
	131	cb->nlh->nlmsg_seq,
	132	NLM_F_MULTI,
	133	sock_i_ino(sk)) < 0) {
	134	ret = 1;
	135	goto done;
	136	}
	137
	138	num++;
	139	}
	140	}
	141
	142	sk_for_each_bound(sk, &tbl->mc_list) {
	143	if (sk_hashed(sk))
	144	continue;
	145	if (!net_eq(sock_net(sk), net))
	146	continue;
	147	if (num < s_num) {
	148	num++;
	149	continue;
	150	}
	151
	152	if (sk_diag_fill(sk, skb, req,
	153	NETLINK_CB(cb->skb).portid,
	154	cb->nlh->nlmsg_seq,
	155	NLM_F_MULTI,
	156	sock_i_ino(sk)) < 0) {
	157	ret = 1;
	158	goto done;
	159	}
	160	num++;
	161	}
	162	done:
	163	cb->args[0] = num;
	164	cb->args[1] = protocol;
	165
	166	return ret;
	167	}
	168
	169	static int netlink_diag_dump(struct sk_buff skb, struct netlink_callback cb)
	170	{
	171	struct netlink_diag_req *req;
	172	int s_num = cb->args[0];
	173
	174	req = nlmsg_data(cb->nlh);
	175
c5adde94	176	rcu_read_lock();
eaaa3139 AV	177	read_lock(&nl_table_lock);
	178
	179	if (req->sdiag_protocol == NDIAG_PROTO_ALL) {
	180	int i;
	181
	182	for (i = cb->args[1]; i < MAX_LINKS; i++) {
	183	if (__netlink_diag_dump(skb, cb, i, s_num))
	184	break;
	185	s_num = 0;
	186	}
	187	} else {
	188	if (req->sdiag_protocol >= MAX_LINKS) {
	189	read_unlock(&nl_table_lock);
c5adde94	190	rcu_read_unlock();
eaaa3139 AV	191	return -ENOENT;
	192	}
	193
	194	__netlink_diag_dump(skb, cb, req->sdiag_protocol, s_num);
	195	}
	196
	197	read_unlock(&nl_table_lock);
c5adde94	198	rcu_read_unlock();
eaaa3139 AV	199
	200	return skb->len;
	201	}
	202
	203	static int netlink_diag_handler_dump(struct sk_buff skb, struct nlmsghdr h)
	204	{
	205	int hdrlen = sizeof(struct netlink_diag_req);
	206	struct net *net = sock_net(skb->sk);
	207
	208	if (nlmsg_len(h) < hdrlen)
	209	return -EINVAL;
	210
	211	if (h->nlmsg_flags & NLM_F_DUMP) {
	212	struct netlink_dump_control c = {
	213	.dump = netlink_diag_dump,
	214	};
	215	return netlink_dump_start(net->diag_nlsk, skb, h, &c);
	216	} else
	217	return -EOPNOTSUPP;
	218	}
	219
	220	static const struct sock_diag_handler netlink_diag_handler = {
	221	.family = AF_NETLINK,
	222	.dump = netlink_diag_handler_dump,
	223	};
	224
	225	static int __init netlink_diag_init(void)
	226	{
	227	return sock_diag_register(&netlink_diag_handler);
	228	}
	229
	230	static void __exit netlink_diag_exit(void)
	231	{
	232	sock_diag_unregister(&netlink_diag_handler);
	233	}
	234
	235	module_init(netlink_diag_init);
	236	module_exit(netlink_diag_exit);
	237	MODULE_LICENSE("GPL");
	238	MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 16 /* AF_NETLINK */);