[mirror_ubuntu-artful-kernel.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);

	ret = rhashtable_walk_start(hti);
	if (ret == -EAGAIN)
		ret = 0;
	if (ret)
		goto stop;

	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;
		}
	}

stop:
	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
	118	ret = rhashtable_walk_start(hti);
	119	if (ret == -EAGAIN)
	120	ret = 0;
	121	if (ret)
	122	goto stop;
	123
	124	while ((nlsk = rhashtable_walk_next(hti))) {
	125	if (IS_ERR(nlsk)) {
	126	ret = PTR_ERR(nlsk);
	127	if (ret == -EAGAIN) {
	128	ret = 0;
eaaa3139 AV	129	continue;
eaaa3139 AV	130	}
ad202074 HX	131	break;
ad202074 HX	132	}
eaaa3139	133
ad202074	134	sk = (struct sock *)nlsk;
eaaa3139	135
ad202074 HX	136	if (!net_eq(sock_net(sk), net))
	137	continue;
	138
	139	if (sk_diag_fill(sk, skb, req,
	140	NETLINK_CB(cb->skb).portid,
	141	cb->nlh->nlmsg_seq,
	142	NLM_F_MULTI,
	143	sock_i_ino(sk)) < 0) {
	144	ret = 1;
	145	break;
eaaa3139 AV	146	}
	147	}
	148
ad202074 HX	149	stop:
	150	rhashtable_walk_stop(hti);
	151	if (ret)
	152	goto done;
	153
	154	rhashtable_walk_exit(hti);
ad202074 HX	155	num++;
	156
	157	mc_list:
	158	read_lock(&nl_table_lock);
eaaa3139 AV	159	sk_for_each_bound(sk, &tbl->mc_list) {
	160	if (sk_hashed(sk))
	161	continue;
	162	if (!net_eq(sock_net(sk), net))
	163	continue;
	164	if (num < s_num) {
	165	num++;
	166	continue;
	167	}
	168
	169	if (sk_diag_fill(sk, skb, req,
	170	NETLINK_CB(cb->skb).portid,
	171	cb->nlh->nlmsg_seq,
	172	NLM_F_MULTI,
	173	sock_i_ino(sk)) < 0) {
	174	ret = 1;
ad202074	175	break;
eaaa3139 AV	176	}
	177	num++;
	178	}
ad202074 HX	179	read_unlock(&nl_table_lock);
ad202074 HX	180
eaaa3139 AV	181	done:
eaaa3139 AV	182	cb->args[0] = num;
eaaa3139 AV	183
	184	return ret;
	185	}
	186
	187	static int netlink_diag_dump(struct sk_buff skb, struct netlink_callback cb)
	188	{
	189	struct netlink_diag_req *req;
	190	int s_num = cb->args[0];
ad202074	191	int err = 0;
eaaa3139 AV	192
	193	req = nlmsg_data(cb->nlh);
	194
eaaa3139 AV	195	if (req->sdiag_protocol == NDIAG_PROTO_ALL) {
	196	int i;
	197
	198	for (i = cb->args[1]; i < MAX_LINKS; i++) {
ad202074 HX	199	err = __netlink_diag_dump(skb, cb, i, s_num);
ad202074 HX	200	if (err)
eaaa3139 AV	201	break;
	202	s_num = 0;
	203	}
ad202074	204	cb->args[1] = i;
eaaa3139	205	} else {
93636d1f	206	if (req->sdiag_protocol >= MAX_LINKS)
eaaa3139	207	return -ENOENT;
eaaa3139	208
ad202074	209	err = __netlink_diag_dump(skb, cb, req->sdiag_protocol, s_num);
eaaa3139 AV	210	}
eaaa3139 AV	211
ad202074 HX	212	return err < 0 ? err : skb->len;
	213	}
	214
	215	static int netlink_diag_dump_done(struct netlink_callback *cb)
	216	{
	217	struct rhashtable_iter hti = (void )cb->args[2];
	218
	219	if (cb->args[0] == 1)
	220	rhashtable_walk_exit(hti);
eaaa3139	221
ad202074 HX	222	kfree(hti);
	223
	224	return 0;
eaaa3139 AV	225	}
	226
	227	static int netlink_diag_handler_dump(struct sk_buff skb, struct nlmsghdr h)
	228	{
	229	int hdrlen = sizeof(struct netlink_diag_req);
	230	struct net *net = sock_net(skb->sk);
	231
	232	if (nlmsg_len(h) < hdrlen)
	233	return -EINVAL;
	234
	235	if (h->nlmsg_flags & NLM_F_DUMP) {
	236	struct netlink_dump_control c = {
	237	.dump = netlink_diag_dump,
ad202074	238	.done = netlink_diag_dump_done,
eaaa3139 AV	239	};
	240	return netlink_dump_start(net->diag_nlsk, skb, h, &c);
	241	} else
	242	return -EOPNOTSUPP;
	243	}
	244
	245	static const struct sock_diag_handler netlink_diag_handler = {
	246	.family = AF_NETLINK,
	247	.dump = netlink_diag_handler_dump,
	248	};
	249
	250	static int __init netlink_diag_init(void)
	251	{
	252	return sock_diag_register(&netlink_diag_handler);
	253	}
	254
	255	static void __exit netlink_diag_exit(void)
	256	{
	257	sock_diag_unregister(&netlink_diag_handler);
	258	}
	259
	260	module_init(netlink_diag_init);
	261	module_exit(netlink_diag_exit);
	262	MODULE_LICENSE("GPL");
	263	MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 16 /* AF_NETLINK */);