[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"

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->flags & NETLINK_F_RECV_PKTINFO)
		flags |= NDIAG_FLAG_PKTINFO;
	if (nlk->flags & NETLINK_F_BROADCAST_SEND_ERROR)
		flags |= NDIAG_FLAG_BROADCAST_ERROR;
	if (nlk->flags & NETLINK_F_RECV_NO_ENOBUFS)
		flags |= NDIAG_FLAG_NO_ENOBUFS;
	if (nlk->flags & NETLINK_F_LISTEN_ALL_NSID)
		flags |= NDIAG_FLAG_LISTEN_ALL_NSID;
	if (nlk->flags & NETLINK_F_CAP_ACK)
		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;
	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(&nl_table_lock);
	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(&nl_table_lock);

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