[mirror_ubuntu-jammy-kernel.git] / net / netlink / diag.c

// SPDX-License-Identifier: GPL-2.0-only
#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
09c434b8	1	// SPDX-License-Identifier: GPL-2.0-only
eaaa3139 AV	2	#include <linux/module.h>
	3
	4	#include <net/sock.h>
	5	#include <linux/netlink.h>
	6	#include <linux/sock_diag.h>
	7	#include <linux/netlink_diag.h>
e341694e	8	#include <linux/rhashtable.h>
eaaa3139 AV	9
	10	#include "af_netlink.h"
	11
	12	static int sk_diag_dump_groups(struct sock sk, struct sk_buff nlskb)
	13	{
	14	struct netlink_sock *nlk = nlk_sk(sk);
	15
	16	if (nlk->groups == NULL)
	17	return 0;
	18
	19	return nla_put(nlskb, NETLINK_DIAG_GROUPS, NLGRPSZ(nlk->ngroups),
	20	nlk->groups);
	21	}
	22
457c79e5 AV	23	static int sk_diag_put_flags(struct sock sk, struct sk_buff skb)
	24	{
	25	struct netlink_sock *nlk = nlk_sk(sk);
	26	u32 flags = 0;
	27
	28	if (nlk->cb_running)
	29	flags \|= NDIAG_FLAG_CB_RUNNING;
	30	if (nlk->flags & NETLINK_F_RECV_PKTINFO)
	31	flags \|= NDIAG_FLAG_PKTINFO;
	32	if (nlk->flags & NETLINK_F_BROADCAST_SEND_ERROR)
	33	flags \|= NDIAG_FLAG_BROADCAST_ERROR;
	34	if (nlk->flags & NETLINK_F_RECV_NO_ENOBUFS)
	35	flags \|= NDIAG_FLAG_NO_ENOBUFS;
	36	if (nlk->flags & NETLINK_F_LISTEN_ALL_NSID)
	37	flags \|= NDIAG_FLAG_LISTEN_ALL_NSID;
	38	if (nlk->flags & NETLINK_F_CAP_ACK)
	39	flags \|= NDIAG_FLAG_CAP_ACK;
	40
	41	return nla_put_u32(skb, NETLINK_DIAG_FLAGS, flags);
	42	}
	43
eaaa3139 AV	44	static int sk_diag_fill(struct sock sk, struct sk_buff skb,
	45	struct netlink_diag_req *req,
	46	u32 portid, u32 seq, u32 flags, int sk_ino)
	47	{
	48	struct nlmsghdr *nlh;
	49	struct netlink_diag_msg *rep;
	50	struct netlink_sock *nlk = nlk_sk(sk);
	51
	52	nlh = nlmsg_put(skb, portid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rep),
	53	flags);
	54	if (!nlh)
	55	return -EMSGSIZE;
	56
	57	rep = nlmsg_data(nlh);
	58	rep->ndiag_family = AF_NETLINK;
	59	rep->ndiag_type = sk->sk_type;
	60	rep->ndiag_protocol = sk->sk_protocol;
	61	rep->ndiag_state = sk->sk_state;
	62
	63	rep->ndiag_ino = sk_ino;
	64	rep->ndiag_portid = nlk->portid;
	65	rep->ndiag_dst_portid = nlk->dst_portid;
	66	rep->ndiag_dst_group = nlk->dst_group;
	67	sock_diag_save_cookie(sk, rep->ndiag_cookie);
	68
	69	if ((req->ndiag_show & NDIAG_SHOW_GROUPS) &&
	70	sk_diag_dump_groups(sk, skb))
	71	goto out_nlmsg_trim;
	72
	73	if ((req->ndiag_show & NDIAG_SHOW_MEMINFO) &&
	74	sock_diag_put_meminfo(sk, skb, NETLINK_DIAG_MEMINFO))
	75	goto out_nlmsg_trim;
	76
457c79e5 AV	77	if ((req->ndiag_show & NDIAG_SHOW_FLAGS) &&
	78	sk_diag_put_flags(sk, skb))
	79	goto out_nlmsg_trim;
	80
053c095a JB	81	nlmsg_end(skb, nlh);
053c095a JB	82	return 0;
eaaa3139 AV	83
	84	out_nlmsg_trim:
	85	nlmsg_cancel(skb, nlh);
	86	return -EMSGSIZE;
	87	}
	88
	89	static int __netlink_diag_dump(struct sk_buff skb, struct netlink_callback cb,
	90	int protocol, int s_num)
	91	{
ad202074	92	struct rhashtable_iter hti = (void )cb->args[2];
eaaa3139	93	struct netlink_table *tbl = &nl_table[protocol];
eaaa3139 AV	94	struct net *net = sock_net(skb->sk);
eaaa3139 AV	95	struct netlink_diag_req *req;
e341694e	96	struct netlink_sock *nlsk;
eaaa3139	97	struct sock *sk;
ad202074 HX	98	int num = 2;
ad202074 HX	99	int ret = 0;
eaaa3139 AV	100
	101	req = nlmsg_data(cb->nlh);
	102
ad202074 HX	103	if (s_num > 1)
ad202074 HX	104	goto mc_list;
88d6ed15	105
ad202074	106	num--;
e341694e	107
ad202074 HX	108	if (!hti) {
	109	hti = kmalloc(sizeof(*hti), GFP_KERNEL);
	110	if (!hti)
	111	return -ENOMEM;
	112
	113	cb->args[2] = (long)hti;
	114	}
	115
	116	if (!s_num)
	117	rhashtable_walk_enter(&tbl->hash, hti);
	118
97a6ec4a	119	rhashtable_walk_start(hti);
ad202074 HX	120
	121	while ((nlsk = rhashtable_walk_next(hti))) {
	122	if (IS_ERR(nlsk)) {
	123	ret = PTR_ERR(nlsk);
	124	if (ret == -EAGAIN) {
	125	ret = 0;
eaaa3139 AV	126	continue;
eaaa3139 AV	127	}
ad202074 HX	128	break;
ad202074 HX	129	}
eaaa3139	130
ad202074	131	sk = (struct sock *)nlsk;
eaaa3139	132
ad202074 HX	133	if (!net_eq(sock_net(sk), net))
	134	continue;
	135
	136	if (sk_diag_fill(sk, skb, req,
	137	NETLINK_CB(cb->skb).portid,
	138	cb->nlh->nlmsg_seq,
	139	NLM_F_MULTI,
	140	sock_i_ino(sk)) < 0) {
	141	ret = 1;
	142	break;
eaaa3139 AV	143	}
	144	}
	145
ad202074	146	rhashtable_walk_stop(hti);
97a6ec4a	147
ad202074 HX	148	if (ret)
	149	goto done;
	150
	151	rhashtable_walk_exit(hti);
ad202074 HX	152	num++;
	153
	154	mc_list:
	155	read_lock(&nl_table_lock);
eaaa3139 AV	156	sk_for_each_bound(sk, &tbl->mc_list) {
	157	if (sk_hashed(sk))
	158	continue;
	159	if (!net_eq(sock_net(sk), net))
	160	continue;
	161	if (num < s_num) {
	162	num++;
	163	continue;
	164	}
	165
	166	if (sk_diag_fill(sk, skb, req,
	167	NETLINK_CB(cb->skb).portid,
	168	cb->nlh->nlmsg_seq,
	169	NLM_F_MULTI,
	170	sock_i_ino(sk)) < 0) {
	171	ret = 1;
ad202074	172	break;
eaaa3139 AV	173	}
	174	num++;
	175	}
ad202074 HX	176	read_unlock(&nl_table_lock);
ad202074 HX	177
eaaa3139 AV	178	done:
eaaa3139 AV	179	cb->args[0] = num;
eaaa3139 AV	180
	181	return ret;
	182	}
	183
	184	static int netlink_diag_dump(struct sk_buff skb, struct netlink_callback cb)
	185	{
	186	struct netlink_diag_req *req;
	187	int s_num = cb->args[0];
ad202074	188	int err = 0;
eaaa3139 AV	189
	190	req = nlmsg_data(cb->nlh);
	191
eaaa3139 AV	192	if (req->sdiag_protocol == NDIAG_PROTO_ALL) {
	193	int i;
	194
	195	for (i = cb->args[1]; i < MAX_LINKS; i++) {
ad202074 HX	196	err = __netlink_diag_dump(skb, cb, i, s_num);
ad202074 HX	197	if (err)
eaaa3139 AV	198	break;
	199	s_num = 0;
	200	}
ad202074	201	cb->args[1] = i;
eaaa3139	202	} else {
93636d1f	203	if (req->sdiag_protocol >= MAX_LINKS)
eaaa3139	204	return -ENOENT;
eaaa3139	205
ad202074	206	err = __netlink_diag_dump(skb, cb, req->sdiag_protocol, s_num);
eaaa3139 AV	207	}
eaaa3139 AV	208
ad202074 HX	209	return err < 0 ? err : skb->len;
	210	}
	211
	212	static int netlink_diag_dump_done(struct netlink_callback *cb)
	213	{
	214	struct rhashtable_iter hti = (void )cb->args[2];
	215
	216	if (cb->args[0] == 1)
	217	rhashtable_walk_exit(hti);
eaaa3139	218
ad202074 HX	219	kfree(hti);
	220
	221	return 0;
eaaa3139 AV	222	}
	223
	224	static int netlink_diag_handler_dump(struct sk_buff skb, struct nlmsghdr h)
	225	{
	226	int hdrlen = sizeof(struct netlink_diag_req);
	227	struct net *net = sock_net(skb->sk);
	228
	229	if (nlmsg_len(h) < hdrlen)
	230	return -EINVAL;
	231
	232	if (h->nlmsg_flags & NLM_F_DUMP) {
	233	struct netlink_dump_control c = {
	234	.dump = netlink_diag_dump,
ad202074	235	.done = netlink_diag_dump_done,
eaaa3139 AV	236	};
	237	return netlink_dump_start(net->diag_nlsk, skb, h, &c);
	238	} else
	239	return -EOPNOTSUPP;
	240	}
	241
	242	static const struct sock_diag_handler netlink_diag_handler = {
	243	.family = AF_NETLINK,
	244	.dump = netlink_diag_handler_dump,
	245	};
	246
	247	static int __init netlink_diag_init(void)
	248	{
	249	return sock_diag_register(&netlink_diag_handler);
	250	}
	251
	252	static void __exit netlink_diag_exit(void)
	253	{
	254	sock_diag_unregister(&netlink_diag_handler);
	255	}
	256
	257	module_init(netlink_diag_init);
	258	module_exit(netlink_diag_exit);
	259	MODULE_LICENSE("GPL");
	260	MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 16 /* AF_NETLINK */);