[mirror_ubuntu-zesty-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_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 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) {
			read_unlock(&nl_table_lock);
			rcu_read_unlock();
			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
	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	{
ad202074	66	struct rhashtable_iter hti = (void )cb->args[2];
eaaa3139	67	struct netlink_table *tbl = &nl_table[protocol];
eaaa3139 AV	68	struct net *net = sock_net(skb->sk);
eaaa3139 AV	69	struct netlink_diag_req *req;
e341694e	70	struct netlink_sock *nlsk;
eaaa3139	71	struct sock *sk;
ad202074 HX	72	int num = 2;
ad202074 HX	73	int ret = 0;
eaaa3139 AV	74
	75	req = nlmsg_data(cb->nlh);
	76
ad202074 HX	77	if (s_num > 1)
ad202074 HX	78	goto mc_list;
88d6ed15	79
ad202074	80	num--;
e341694e	81
ad202074 HX	82	if (!hti) {
	83	hti = kmalloc(sizeof(*hti), GFP_KERNEL);
	84	if (!hti)
	85	return -ENOMEM;
	86
	87	cb->args[2] = (long)hti;
	88	}
	89
	90	if (!s_num)
	91	rhashtable_walk_enter(&tbl->hash, hti);
	92
	93	ret = rhashtable_walk_start(hti);
	94	if (ret == -EAGAIN)
	95	ret = 0;
	96	if (ret)
	97	goto stop;
	98
	99	while ((nlsk = rhashtable_walk_next(hti))) {
	100	if (IS_ERR(nlsk)) {
	101	ret = PTR_ERR(nlsk);
	102	if (ret == -EAGAIN) {
	103	ret = 0;
eaaa3139 AV	104	continue;
eaaa3139 AV	105	}
ad202074 HX	106	break;
ad202074 HX	107	}
eaaa3139	108
ad202074	109	sk = (struct sock *)nlsk;
eaaa3139	110
ad202074 HX	111	if (!net_eq(sock_net(sk), net))
	112	continue;
	113
	114	if (sk_diag_fill(sk, skb, req,
	115	NETLINK_CB(cb->skb).portid,
	116	cb->nlh->nlmsg_seq,
	117	NLM_F_MULTI,
	118	sock_i_ino(sk)) < 0) {
	119	ret = 1;
	120	break;
eaaa3139 AV	121	}
	122	}
	123
ad202074 HX	124	stop:
	125	rhashtable_walk_stop(hti);
	126	if (ret)
	127	goto done;
	128
	129	rhashtable_walk_exit(hti);
ad202074 HX	130	num++;
	131
	132	mc_list:
	133	read_lock(&nl_table_lock);
eaaa3139 AV	134	sk_for_each_bound(sk, &tbl->mc_list) {
	135	if (sk_hashed(sk))
	136	continue;
	137	if (!net_eq(sock_net(sk), net))
	138	continue;
	139	if (num < s_num) {
	140	num++;
	141	continue;
	142	}
	143
	144	if (sk_diag_fill(sk, skb, req,
	145	NETLINK_CB(cb->skb).portid,
	146	cb->nlh->nlmsg_seq,
	147	NLM_F_MULTI,
	148	sock_i_ino(sk)) < 0) {
	149	ret = 1;
ad202074	150	break;
eaaa3139 AV	151	}
	152	num++;
	153	}
ad202074 HX	154	read_unlock(&nl_table_lock);
ad202074 HX	155
eaaa3139 AV	156	done:
eaaa3139 AV	157	cb->args[0] = num;
eaaa3139 AV	158
	159	return ret;
	160	}
	161
	162	static int netlink_diag_dump(struct sk_buff skb, struct netlink_callback cb)
	163	{
	164	struct netlink_diag_req *req;
	165	int s_num = cb->args[0];
ad202074	166	int err = 0;
eaaa3139 AV	167
	168	req = nlmsg_data(cb->nlh);
	169
eaaa3139 AV	170	if (req->sdiag_protocol == NDIAG_PROTO_ALL) {
	171	int i;
	172
	173	for (i = cb->args[1]; i < MAX_LINKS; i++) {
ad202074 HX	174	err = __netlink_diag_dump(skb, cb, i, s_num);
ad202074 HX	175	if (err)
eaaa3139 AV	176	break;
	177	s_num = 0;
	178	}
ad202074	179	cb->args[1] = i;
eaaa3139 AV	180	} else {
	181	if (req->sdiag_protocol >= MAX_LINKS) {
	182	read_unlock(&nl_table_lock);
c5adde94	183	rcu_read_unlock();
eaaa3139 AV	184	return -ENOENT;
	185	}
	186
ad202074	187	err = __netlink_diag_dump(skb, cb, req->sdiag_protocol, s_num);
eaaa3139 AV	188	}
eaaa3139 AV	189
ad202074 HX	190	return err < 0 ? err : skb->len;
	191	}
	192
	193	static int netlink_diag_dump_done(struct netlink_callback *cb)
	194	{
	195	struct rhashtable_iter hti = (void )cb->args[2];
	196
	197	if (cb->args[0] == 1)
	198	rhashtable_walk_exit(hti);
eaaa3139	199
ad202074 HX	200	kfree(hti);
	201
	202	return 0;
eaaa3139 AV	203	}
	204
	205	static int netlink_diag_handler_dump(struct sk_buff skb, struct nlmsghdr h)
	206	{
	207	int hdrlen = sizeof(struct netlink_diag_req);
	208	struct net *net = sock_net(skb->sk);
	209
	210	if (nlmsg_len(h) < hdrlen)
	211	return -EINVAL;
	212
	213	if (h->nlmsg_flags & NLM_F_DUMP) {
	214	struct netlink_dump_control c = {
	215	.dump = netlink_diag_dump,
ad202074	216	.done = netlink_diag_dump_done,
eaaa3139 AV	217	};
	218	return netlink_dump_start(net->diag_nlsk, skb, h, &c);
	219	} else
	220	return -EOPNOTSUPP;
	221	}
	222
	223	static const struct sock_diag_handler netlink_diag_handler = {
	224	.family = AF_NETLINK,
	225	.dump = netlink_diag_handler_dump,
	226	};
	227
	228	static int __init netlink_diag_init(void)
	229	{
	230	return sock_diag_register(&netlink_diag_handler);
	231	}
	232
	233	static void __exit netlink_diag_exit(void)
	234	{
	235	sock_diag_unregister(&netlink_diag_handler);
	236	}
	237
	238	module_init(netlink_diag_init);
	239	module_exit(netlink_diag_exit);
	240	MODULE_LICENSE("GPL");
	241	MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 16 /* AF_NETLINK */);