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>
  7#include <linux/rhashtable.h>
  8
  9#include "af_netlink.h"
 10
 11static 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
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 22static 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
 
 
 
 
 55	nlmsg_end(skb, nlh);
 56	return 0;
 57
 58out_nlmsg_trim:
 59	nlmsg_cancel(skb, nlh);
 60	return -EMSGSIZE;
 61}
 62
 63static int __netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
 64				int protocol, int s_num)
 65{
 66	struct rhashtable_iter *hti = (void *)cb->args[2];
 67	struct netlink_table *tbl = &nl_table[protocol];
 68	struct net *net = sock_net(skb->sk);
 69	struct netlink_diag_req *req;
 70	struct netlink_sock *nlsk;
 
 71	struct sock *sk;
 72	int num = 2;
 73	int ret = 0;
 74
 75	req = nlmsg_data(cb->nlh);
 76
 77	if (s_num > 1)
 78		goto mc_list;
 79
 80	num--;
 81
 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;
104				continue;
105			}
106			break;
107		}
108
109		sk = (struct sock *)nlsk;
110
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;
121		}
122	}
123
124stop:
125	rhashtable_walk_stop(hti);
 
126	if (ret)
127		goto done;
128
129	rhashtable_walk_exit(hti);
130	num++;
131
132mc_list:
133	read_lock(&nl_table_lock);
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;
150			break;
151		}
152		num++;
153	}
154	read_unlock(&nl_table_lock);
155
156done:
157	cb->args[0] = num;
158
159	return ret;
160}
161
162static 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];
166	int err = 0;
167
168	req = nlmsg_data(cb->nlh);
169
170	if (req->sdiag_protocol == NDIAG_PROTO_ALL) {
171		int i;
172
173		for (i = cb->args[1]; i < MAX_LINKS; i++) {
174			err = __netlink_diag_dump(skb, cb, i, s_num);
175			if (err)
176				break;
177			s_num = 0;
178		}
179		cb->args[1] = i;
180	} else {
181		if (req->sdiag_protocol >= MAX_LINKS)
182			return -ENOENT;
183
184		err = __netlink_diag_dump(skb, cb, req->sdiag_protocol, s_num);
185	}
186
187	return err < 0 ? err : skb->len;
188}
189
190static int netlink_diag_dump_done(struct netlink_callback *cb)
191{
192	struct rhashtable_iter *hti = (void *)cb->args[2];
193
194	if (cb->args[0] == 1)
195		rhashtable_walk_exit(hti);
196
197	kfree(hti);
198
199	return 0;
200}
201
202static int netlink_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
203{
204	int hdrlen = sizeof(struct netlink_diag_req);
205	struct net *net = sock_net(skb->sk);
206
207	if (nlmsg_len(h) < hdrlen)
208		return -EINVAL;
209
210	if (h->nlmsg_flags & NLM_F_DUMP) {
211		struct netlink_dump_control c = {
212			.dump = netlink_diag_dump,
213			.done = netlink_diag_dump_done,
214		};
215		return netlink_dump_start(net->diag_nlsk, skb, h, &c);
216	} else
217		return -EOPNOTSUPP;
218}
219
220static const struct sock_diag_handler netlink_diag_handler = {
 
221	.family = AF_NETLINK,
222	.dump = netlink_diag_handler_dump,
223};
224
225static int __init netlink_diag_init(void)
226{
227	return sock_diag_register(&netlink_diag_handler);
228}
229
230static void __exit netlink_diag_exit(void)
231{
232	sock_diag_unregister(&netlink_diag_handler);
233}
234
235module_init(netlink_diag_init);
236module_exit(netlink_diag_exit);
 
237MODULE_LICENSE("GPL");
238MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 16 /* AF_NETLINK */);

  1// SPDX-License-Identifier: GPL-2.0-only
  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>
  8#include <linux/rhashtable.h>
  9
 10#include "af_netlink.h"
 11
 12static 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
 23static 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_test_bit(RECV_PKTINFO, sk))
 31		flags |= NDIAG_FLAG_PKTINFO;
 32	if (nlk_test_bit(BROADCAST_SEND_ERROR, sk))
 33		flags |= NDIAG_FLAG_BROADCAST_ERROR;
 34	if (nlk_test_bit(RECV_NO_ENOBUFS, sk))
 35		flags |= NDIAG_FLAG_NO_ENOBUFS;
 36	if (nlk_test_bit(LISTEN_ALL_NSID, sk))
 37		flags |= NDIAG_FLAG_LISTEN_ALL_NSID;
 38	if (nlk_test_bit(CAP_ACK, sk))
 39		flags |= NDIAG_FLAG_CAP_ACK;
 40
 41	return nla_put_u32(skb, NETLINK_DIAG_FLAGS, flags);
 42}
 43
 44static 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
 77	if ((req->ndiag_show & NDIAG_SHOW_FLAGS) &&
 78	    sk_diag_put_flags(sk, skb))
 79		goto out_nlmsg_trim;
 80
 81	nlmsg_end(skb, nlh);
 82	return 0;
 83
 84out_nlmsg_trim:
 85	nlmsg_cancel(skb, nlh);
 86	return -EMSGSIZE;
 87}
 88
 89static int __netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
 90				int protocol, int s_num)
 91{
 92	struct rhashtable_iter *hti = (void *)cb->args[2];
 93	struct netlink_table *tbl = &nl_table[protocol];
 94	struct net *net = sock_net(skb->sk);
 95	struct netlink_diag_req *req;
 96	struct netlink_sock *nlsk;
 97	unsigned long flags;
 98	struct sock *sk;
 99	int num = 2;
100	int ret = 0;
101
102	req = nlmsg_data(cb->nlh);
103
104	if (s_num > 1)
105		goto mc_list;
106
107	num--;
108
109	if (!hti) {
110		hti = kmalloc(sizeof(*hti), GFP_KERNEL);
111		if (!hti)
112			return -ENOMEM;
113
114		cb->args[2] = (long)hti;
115	}
116
117	if (!s_num)
118		rhashtable_walk_enter(&tbl->hash, hti);
119
120	rhashtable_walk_start(hti);
 
 
 
 
121
122	while ((nlsk = rhashtable_walk_next(hti))) {
123		if (IS_ERR(nlsk)) {
124			ret = PTR_ERR(nlsk);
125			if (ret == -EAGAIN) {
126				ret = 0;
127				continue;
128			}
129			break;
130		}
131
132		sk = (struct sock *)nlsk;
133
134		if (!net_eq(sock_net(sk), net))
135			continue;
136
137		if (sk_diag_fill(sk, skb, req,
138				 NETLINK_CB(cb->skb).portid,
139				 cb->nlh->nlmsg_seq,
140				 NLM_F_MULTI,
141				 sock_i_ino(sk)) < 0) {
142			ret = 1;
143			break;
144		}
145	}
146
 
147	rhashtable_walk_stop(hti);
148
149	if (ret)
150		goto done;
151
152	rhashtable_walk_exit(hti);
153	num++;
154
155mc_list:
156	read_lock_irqsave(&nl_table_lock, flags);
157	sk_for_each_bound(sk, &tbl->mc_list) {
158		if (sk_hashed(sk))
159			continue;
160		if (!net_eq(sock_net(sk), net))
161			continue;
162		if (num < s_num) {
163			num++;
164			continue;
165		}
166
167		if (sk_diag_fill(sk, skb, req,
168				 NETLINK_CB(cb->skb).portid,
169				 cb->nlh->nlmsg_seq,
170				 NLM_F_MULTI,
171				 __sock_i_ino(sk)) < 0) {
172			ret = 1;
173			break;
174		}
175		num++;
176	}
177	read_unlock_irqrestore(&nl_table_lock, flags);
178
179done:
180	cb->args[0] = num;
181
182	return ret;
183}
184
185static int netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
186{
187	struct netlink_diag_req *req;
188	int s_num = cb->args[0];
189	int err = 0;
190
191	req = nlmsg_data(cb->nlh);
192
193	if (req->sdiag_protocol == NDIAG_PROTO_ALL) {
194		int i;
195
196		for (i = cb->args[1]; i < MAX_LINKS; i++) {
197			err = __netlink_diag_dump(skb, cb, i, s_num);
198			if (err)
199				break;
200			s_num = 0;
201		}
202		cb->args[1] = i;
203	} else {
204		if (req->sdiag_protocol >= MAX_LINKS)
205			return -ENOENT;
206
207		err = __netlink_diag_dump(skb, cb, req->sdiag_protocol, s_num);
208	}
209
210	return err <= 0 ? err : skb->len;
211}
212
213static int netlink_diag_dump_done(struct netlink_callback *cb)
214{
215	struct rhashtable_iter *hti = (void *)cb->args[2];
216
217	if (cb->args[0] == 1)
218		rhashtable_walk_exit(hti);
219
220	kfree(hti);
221
222	return 0;
223}
224
225static int netlink_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
226{
227	int hdrlen = sizeof(struct netlink_diag_req);
228	struct net *net = sock_net(skb->sk);
229
230	if (nlmsg_len(h) < hdrlen)
231		return -EINVAL;
232
233	if (h->nlmsg_flags & NLM_F_DUMP) {
234		struct netlink_dump_control c = {
235			.dump = netlink_diag_dump,
236			.done = netlink_diag_dump_done,
237		};
238		return netlink_dump_start(net->diag_nlsk, skb, h, &c);
239	} else
240		return -EOPNOTSUPP;
241}
242
243static const struct sock_diag_handler netlink_diag_handler = {
244	.owner = THIS_MODULE,
245	.family = AF_NETLINK,
246	.dump = netlink_diag_handler_dump,
247};
248
249static int __init netlink_diag_init(void)
250{
251	return sock_diag_register(&netlink_diag_handler);
252}
253
254static void __exit netlink_diag_exit(void)
255{
256	sock_diag_unregister(&netlink_diag_handler);
257}
258
259module_init(netlink_diag_init);
260module_exit(netlink_diag_exit);
261MODULE_DESCRIPTION("Netlink-based socket monitoring/diagnostic interface (sock_diag)");
262MODULE_LICENSE("GPL");
263MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 16 /* AF_NETLINK */);