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v4.10.11
  1#include <linux/types.h>
  2#include <linux/spinlock.h>
  3#include <linux/sock_diag.h>
  4#include <linux/unix_diag.h>
  5#include <linux/skbuff.h>
  6#include <linux/module.h>
  7#include <net/netlink.h>
  8#include <net/af_unix.h>
  9#include <net/tcp_states.h>
 10
 
 
 
 11static int sk_diag_dump_name(struct sock *sk, struct sk_buff *nlskb)
 12{
 13	struct unix_address *addr = unix_sk(sk)->addr;
 
 14
 15	if (!addr)
 16		return 0;
 
 
 17
 18	return nla_put(nlskb, UNIX_DIAG_NAME, addr->len - sizeof(short),
 19		       addr->name->sun_path);
 
 
 20}
 21
 22static int sk_diag_dump_vfs(struct sock *sk, struct sk_buff *nlskb)
 23{
 24	struct dentry *dentry = unix_sk(sk)->path.dentry;
 
 25
 26	if (dentry) {
 27		struct unix_diag_vfs uv = {
 28			.udiag_vfs_ino = d_backing_inode(dentry)->i_ino,
 29			.udiag_vfs_dev = dentry->d_sb->s_dev,
 30		};
 31
 32		return nla_put(nlskb, UNIX_DIAG_VFS, sizeof(uv), &uv);
 33	}
 34
 35	return 0;
 
 
 
 36}
 37
 38static int sk_diag_dump_peer(struct sock *sk, struct sk_buff *nlskb)
 39{
 40	struct sock *peer;
 41	int ino;
 42
 43	peer = unix_peer_get(sk);
 44	if (peer) {
 45		unix_state_lock(peer);
 46		ino = sock_i_ino(peer);
 47		unix_state_unlock(peer);
 48		sock_put(peer);
 49
 50		return nla_put_u32(nlskb, UNIX_DIAG_PEER, ino);
 51	}
 52
 53	return 0;
 
 
 54}
 55
 56static int sk_diag_dump_icons(struct sock *sk, struct sk_buff *nlskb)
 57{
 58	struct sk_buff *skb;
 59	struct nlattr *attr;
 60	u32 *buf;
 61	int i;
 62
 63	if (sk->sk_state == TCP_LISTEN) {
 64		spin_lock(&sk->sk_receive_queue.lock);
 65
 66		attr = nla_reserve(nlskb, UNIX_DIAG_ICONS,
 67				   sk->sk_receive_queue.qlen * sizeof(u32));
 68		if (!attr)
 69			goto errout;
 70
 71		buf = nla_data(attr);
 72		i = 0;
 73		skb_queue_walk(&sk->sk_receive_queue, skb) {
 74			struct sock *req, *peer;
 75
 76			req = skb->sk;
 77			/*
 78			 * The state lock is outer for the same sk's
 79			 * queue lock. With the other's queue locked it's
 80			 * OK to lock the state.
 81			 */
 82			unix_state_lock_nested(req);
 83			peer = unix_sk(req)->peer;
 84			buf[i++] = (peer ? sock_i_ino(peer) : 0);
 85			unix_state_unlock(req);
 86		}
 87		spin_unlock(&sk->sk_receive_queue.lock);
 88	}
 89
 90	return 0;
 91
 92errout:
 93	spin_unlock(&sk->sk_receive_queue.lock);
 94	return -EMSGSIZE;
 95}
 96
 97static int sk_diag_show_rqlen(struct sock *sk, struct sk_buff *nlskb)
 98{
 99	struct unix_diag_rqlen rql;
 
 
100
101	if (sk->sk_state == TCP_LISTEN) {
102		rql.udiag_rqueue = sk->sk_receive_queue.qlen;
103		rql.udiag_wqueue = sk->sk_max_ack_backlog;
104	} else {
105		rql.udiag_rqueue = (u32) unix_inq_len(sk);
106		rql.udiag_wqueue = (u32) unix_outq_len(sk);
107	}
108
109	return nla_put(nlskb, UNIX_DIAG_RQLEN, sizeof(rql), &rql);
 
 
 
110}
111
112static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, struct unix_diag_req *req,
113		u32 portid, u32 seq, u32 flags, int sk_ino)
114{
 
115	struct nlmsghdr *nlh;
116	struct unix_diag_msg *rep;
117
118	nlh = nlmsg_put(skb, portid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rep),
119			flags);
120	if (!nlh)
121		return -EMSGSIZE;
122
123	rep = nlmsg_data(nlh);
124	rep->udiag_family = AF_UNIX;
125	rep->udiag_type = sk->sk_type;
126	rep->udiag_state = sk->sk_state;
127	rep->pad = 0;
128	rep->udiag_ino = sk_ino;
129	sock_diag_save_cookie(sk, rep->udiag_cookie);
130
131	if ((req->udiag_show & UDIAG_SHOW_NAME) &&
132	    sk_diag_dump_name(sk, skb))
133		goto out_nlmsg_trim;
134
135	if ((req->udiag_show & UDIAG_SHOW_VFS) &&
136	    sk_diag_dump_vfs(sk, skb))
137		goto out_nlmsg_trim;
138
139	if ((req->udiag_show & UDIAG_SHOW_PEER) &&
140	    sk_diag_dump_peer(sk, skb))
141		goto out_nlmsg_trim;
142
143	if ((req->udiag_show & UDIAG_SHOW_ICONS) &&
144	    sk_diag_dump_icons(sk, skb))
145		goto out_nlmsg_trim;
146
147	if ((req->udiag_show & UDIAG_SHOW_RQLEN) &&
148	    sk_diag_show_rqlen(sk, skb))
149		goto out_nlmsg_trim;
150
151	if ((req->udiag_show & UDIAG_SHOW_MEMINFO) &&
152	    sock_diag_put_meminfo(sk, skb, UNIX_DIAG_MEMINFO))
153		goto out_nlmsg_trim;
154
155	if (nla_put_u8(skb, UNIX_DIAG_SHUTDOWN, sk->sk_shutdown))
156		goto out_nlmsg_trim;
157
158	nlmsg_end(skb, nlh);
159	return 0;
160
161out_nlmsg_trim:
162	nlmsg_cancel(skb, nlh);
163	return -EMSGSIZE;
164}
165
166static int sk_diag_dump(struct sock *sk, struct sk_buff *skb, struct unix_diag_req *req,
167		u32 portid, u32 seq, u32 flags)
168{
169	int sk_ino;
170
171	unix_state_lock(sk);
172	sk_ino = sock_i_ino(sk);
173	unix_state_unlock(sk);
174
175	if (!sk_ino)
176		return 0;
177
178	return sk_diag_fill(sk, skb, req, portid, seq, flags, sk_ino);
179}
180
181static int unix_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
182{
183	struct unix_diag_req *req;
184	int num, s_num, slot, s_slot;
185	struct net *net = sock_net(skb->sk);
186
187	req = nlmsg_data(cb->nlh);
188
189	s_slot = cb->args[0];
190	num = s_num = cb->args[1];
191
192	spin_lock(&unix_table_lock);
193	for (slot = s_slot;
194	     slot < ARRAY_SIZE(unix_socket_table);
195	     s_num = 0, slot++) {
196		struct sock *sk;
 
197
198		num = 0;
199		sk_for_each(sk, &unix_socket_table[slot]) {
200			if (!net_eq(sock_net(sk), net))
201				continue;
202			if (num < s_num)
203				goto next;
204			if (!(req->udiag_states & (1 << sk->sk_state)))
205				goto next;
206			if (sk_diag_dump(sk, skb, req,
207					 NETLINK_CB(cb->skb).portid,
208					 cb->nlh->nlmsg_seq,
209					 NLM_F_MULTI) < 0)
210				goto done;
211next:
212			num++;
213		}
214	}
215done:
216	spin_unlock(&unix_table_lock);
217	cb->args[0] = slot;
218	cb->args[1] = num;
219
220	return skb->len;
221}
222
223static struct sock *unix_lookup_by_ino(unsigned int ino)
224{
225	int i;
226	struct sock *sk;
227
228	spin_lock(&unix_table_lock);
229	for (i = 0; i < ARRAY_SIZE(unix_socket_table); i++) {
230		sk_for_each(sk, &unix_socket_table[i])
 
 
231			if (ino == sock_i_ino(sk)) {
232				sock_hold(sk);
233				spin_unlock(&unix_table_lock);
234
235				return sk;
236			}
237	}
238
239	spin_unlock(&unix_table_lock);
240	return NULL;
241}
242
243static int unix_diag_get_exact(struct sk_buff *in_skb,
244			       const struct nlmsghdr *nlh,
245			       struct unix_diag_req *req)
246{
247	int err = -EINVAL;
248	struct sock *sk;
249	struct sk_buff *rep;
250	unsigned int extra_len;
251	struct net *net = sock_net(in_skb->sk);
252
253	if (req->udiag_ino == 0)
254		goto out_nosk;
255
256	sk = unix_lookup_by_ino(req->udiag_ino);
257	err = -ENOENT;
258	if (sk == NULL)
259		goto out_nosk;
260
261	err = sock_diag_check_cookie(sk, req->udiag_cookie);
262	if (err)
263		goto out;
264
265	extra_len = 256;
266again:
267	err = -ENOMEM;
268	rep = nlmsg_new(sizeof(struct unix_diag_msg) + extra_len, GFP_KERNEL);
 
269	if (!rep)
270		goto out;
271
272	err = sk_diag_fill(sk, rep, req, NETLINK_CB(in_skb).portid,
273			   nlh->nlmsg_seq, 0, req->udiag_ino);
274	if (err < 0) {
275		nlmsg_free(rep);
276		extra_len += 256;
277		if (extra_len >= PAGE_SIZE)
278			goto out;
279
280		goto again;
281	}
282	err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
283			      MSG_DONTWAIT);
284	if (err > 0)
285		err = 0;
286out:
287	if (sk)
288		sock_put(sk);
289out_nosk:
290	return err;
291}
292
293static int unix_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
294{
295	int hdrlen = sizeof(struct unix_diag_req);
296	struct net *net = sock_net(skb->sk);
297
298	if (nlmsg_len(h) < hdrlen)
299		return -EINVAL;
300
301	if (h->nlmsg_flags & NLM_F_DUMP) {
302		struct netlink_dump_control c = {
303			.dump = unix_diag_dump,
304		};
305		return netlink_dump_start(net->diag_nlsk, skb, h, &c);
306	} else
307		return unix_diag_get_exact(skb, h, nlmsg_data(h));
308}
309
310static const struct sock_diag_handler unix_diag_handler = {
311	.family = AF_UNIX,
312	.dump = unix_diag_handler_dump,
313};
314
315static int __init unix_diag_init(void)
316{
317	return sock_diag_register(&unix_diag_handler);
318}
319
320static void __exit unix_diag_exit(void)
321{
322	sock_diag_unregister(&unix_diag_handler);
323}
324
325module_init(unix_diag_init);
326module_exit(unix_diag_exit);
327MODULE_LICENSE("GPL");
328MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 1 /* AF_LOCAL */);
v3.5.6
  1#include <linux/types.h>
  2#include <linux/spinlock.h>
  3#include <linux/sock_diag.h>
  4#include <linux/unix_diag.h>
  5#include <linux/skbuff.h>
  6#include <linux/module.h>
  7#include <net/netlink.h>
  8#include <net/af_unix.h>
  9#include <net/tcp_states.h>
 10
 11#define UNIX_DIAG_PUT(skb, attrtype, attrlen) \
 12	RTA_DATA(__RTA_PUT(skb, attrtype, attrlen))
 13
 14static int sk_diag_dump_name(struct sock *sk, struct sk_buff *nlskb)
 15{
 16	struct unix_address *addr = unix_sk(sk)->addr;
 17	char *s;
 18
 19	if (addr) {
 20		s = UNIX_DIAG_PUT(nlskb, UNIX_DIAG_NAME, addr->len - sizeof(short));
 21		memcpy(s, addr->name->sun_path, addr->len - sizeof(short));
 22	}
 23
 24	return 0;
 25
 26rtattr_failure:
 27	return -EMSGSIZE;
 28}
 29
 30static int sk_diag_dump_vfs(struct sock *sk, struct sk_buff *nlskb)
 31{
 32	struct dentry *dentry = unix_sk(sk)->path.dentry;
 33	struct unix_diag_vfs *uv;
 34
 35	if (dentry) {
 36		uv = UNIX_DIAG_PUT(nlskb, UNIX_DIAG_VFS, sizeof(*uv));
 37		uv->udiag_vfs_ino = dentry->d_inode->i_ino;
 38		uv->udiag_vfs_dev = dentry->d_sb->s_dev;
 
 
 
 39	}
 40
 41	return 0;
 42
 43rtattr_failure:
 44	return -EMSGSIZE;
 45}
 46
 47static int sk_diag_dump_peer(struct sock *sk, struct sk_buff *nlskb)
 48{
 49	struct sock *peer;
 50	int ino;
 51
 52	peer = unix_peer_get(sk);
 53	if (peer) {
 54		unix_state_lock(peer);
 55		ino = sock_i_ino(peer);
 56		unix_state_unlock(peer);
 57		sock_put(peer);
 58
 59		RTA_PUT_U32(nlskb, UNIX_DIAG_PEER, ino);
 60	}
 61
 62	return 0;
 63rtattr_failure:
 64	return -EMSGSIZE;
 65}
 66
 67static int sk_diag_dump_icons(struct sock *sk, struct sk_buff *nlskb)
 68{
 69	struct sk_buff *skb;
 
 70	u32 *buf;
 71	int i;
 72
 73	if (sk->sk_state == TCP_LISTEN) {
 74		spin_lock(&sk->sk_receive_queue.lock);
 75		buf = UNIX_DIAG_PUT(nlskb, UNIX_DIAG_ICONS,
 76				sk->sk_receive_queue.qlen * sizeof(u32));
 
 
 
 
 
 77		i = 0;
 78		skb_queue_walk(&sk->sk_receive_queue, skb) {
 79			struct sock *req, *peer;
 80
 81			req = skb->sk;
 82			/*
 83			 * The state lock is outer for the same sk's
 84			 * queue lock. With the other's queue locked it's
 85			 * OK to lock the state.
 86			 */
 87			unix_state_lock_nested(req);
 88			peer = unix_sk(req)->peer;
 89			buf[i++] = (peer ? sock_i_ino(peer) : 0);
 90			unix_state_unlock(req);
 91		}
 92		spin_unlock(&sk->sk_receive_queue.lock);
 93	}
 94
 95	return 0;
 96
 97rtattr_failure:
 98	spin_unlock(&sk->sk_receive_queue.lock);
 99	return -EMSGSIZE;
100}
101
102static int sk_diag_show_rqlen(struct sock *sk, struct sk_buff *nlskb)
103{
104	struct unix_diag_rqlen *rql;
105
106	rql = UNIX_DIAG_PUT(nlskb, UNIX_DIAG_RQLEN, sizeof(*rql));
107
108	if (sk->sk_state == TCP_LISTEN) {
109		rql->udiag_rqueue = sk->sk_receive_queue.qlen;
110		rql->udiag_wqueue = sk->sk_max_ack_backlog;
111	} else {
112		rql->udiag_rqueue = (__u32)unix_inq_len(sk);
113		rql->udiag_wqueue = (__u32)unix_outq_len(sk);
114	}
115
116	return 0;
117
118rtattr_failure:
119	return -EMSGSIZE;
120}
121
122static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, struct unix_diag_req *req,
123		u32 pid, u32 seq, u32 flags, int sk_ino)
124{
125	unsigned char *b = skb_tail_pointer(skb);
126	struct nlmsghdr *nlh;
127	struct unix_diag_msg *rep;
128
129	nlh = NLMSG_PUT(skb, pid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rep));
130	nlh->nlmsg_flags = flags;
131
132	rep = NLMSG_DATA(nlh);
133
 
134	rep->udiag_family = AF_UNIX;
135	rep->udiag_type = sk->sk_type;
136	rep->udiag_state = sk->sk_state;
 
137	rep->udiag_ino = sk_ino;
138	sock_diag_save_cookie(sk, rep->udiag_cookie);
139
140	if ((req->udiag_show & UDIAG_SHOW_NAME) &&
141	    sk_diag_dump_name(sk, skb))
142		goto nlmsg_failure;
143
144	if ((req->udiag_show & UDIAG_SHOW_VFS) &&
145	    sk_diag_dump_vfs(sk, skb))
146		goto nlmsg_failure;
147
148	if ((req->udiag_show & UDIAG_SHOW_PEER) &&
149	    sk_diag_dump_peer(sk, skb))
150		goto nlmsg_failure;
151
152	if ((req->udiag_show & UDIAG_SHOW_ICONS) &&
153	    sk_diag_dump_icons(sk, skb))
154		goto nlmsg_failure;
155
156	if ((req->udiag_show & UDIAG_SHOW_RQLEN) &&
157	    sk_diag_show_rqlen(sk, skb))
158		goto nlmsg_failure;
159
160	if ((req->udiag_show & UDIAG_SHOW_MEMINFO) &&
161	    sock_diag_put_meminfo(sk, skb, UNIX_DIAG_MEMINFO))
162		goto nlmsg_failure;
 
 
 
163
164	nlh->nlmsg_len = skb_tail_pointer(skb) - b;
165	return skb->len;
166
167nlmsg_failure:
168	nlmsg_trim(skb, b);
169	return -EMSGSIZE;
170}
171
172static int sk_diag_dump(struct sock *sk, struct sk_buff *skb, struct unix_diag_req *req,
173		u32 pid, u32 seq, u32 flags)
174{
175	int sk_ino;
176
177	unix_state_lock(sk);
178	sk_ino = sock_i_ino(sk);
179	unix_state_unlock(sk);
180
181	if (!sk_ino)
182		return 0;
183
184	return sk_diag_fill(sk, skb, req, pid, seq, flags, sk_ino);
185}
186
187static int unix_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
188{
189	struct unix_diag_req *req;
190	int num, s_num, slot, s_slot;
 
191
192	req = NLMSG_DATA(cb->nlh);
193
194	s_slot = cb->args[0];
195	num = s_num = cb->args[1];
196
197	spin_lock(&unix_table_lock);
198	for (slot = s_slot; slot <= UNIX_HASH_SIZE; s_num = 0, slot++) {
 
 
199		struct sock *sk;
200		struct hlist_node *node;
201
202		num = 0;
203		sk_for_each(sk, node, &unix_socket_table[slot]) {
 
 
204			if (num < s_num)
205				goto next;
206			if (!(req->udiag_states & (1 << sk->sk_state)))
207				goto next;
208			if (sk_diag_dump(sk, skb, req,
209					 NETLINK_CB(cb->skb).pid,
210					 cb->nlh->nlmsg_seq,
211					 NLM_F_MULTI) < 0)
212				goto done;
213next:
214			num++;
215		}
216	}
217done:
218	spin_unlock(&unix_table_lock);
219	cb->args[0] = slot;
220	cb->args[1] = num;
221
222	return skb->len;
223}
224
225static struct sock *unix_lookup_by_ino(int ino)
226{
227	int i;
228	struct sock *sk;
229
230	spin_lock(&unix_table_lock);
231	for (i = 0; i <= UNIX_HASH_SIZE; i++) {
232		struct hlist_node *node;
233
234		sk_for_each(sk, node, &unix_socket_table[i])
235			if (ino == sock_i_ino(sk)) {
236				sock_hold(sk);
237				spin_unlock(&unix_table_lock);
238
239				return sk;
240			}
241	}
242
243	spin_unlock(&unix_table_lock);
244	return NULL;
245}
246
247static int unix_diag_get_exact(struct sk_buff *in_skb,
248			       const struct nlmsghdr *nlh,
249			       struct unix_diag_req *req)
250{
251	int err = -EINVAL;
252	struct sock *sk;
253	struct sk_buff *rep;
254	unsigned int extra_len;
 
255
256	if (req->udiag_ino == 0)
257		goto out_nosk;
258
259	sk = unix_lookup_by_ino(req->udiag_ino);
260	err = -ENOENT;
261	if (sk == NULL)
262		goto out_nosk;
263
264	err = sock_diag_check_cookie(sk, req->udiag_cookie);
265	if (err)
266		goto out;
267
268	extra_len = 256;
269again:
270	err = -ENOMEM;
271	rep = alloc_skb(NLMSG_SPACE((sizeof(struct unix_diag_msg) + extra_len)),
272			GFP_KERNEL);
273	if (!rep)
274		goto out;
275
276	err = sk_diag_fill(sk, rep, req, NETLINK_CB(in_skb).pid,
277			   nlh->nlmsg_seq, 0, req->udiag_ino);
278	if (err < 0) {
279		kfree_skb(rep);
280		extra_len += 256;
281		if (extra_len >= PAGE_SIZE)
282			goto out;
283
284		goto again;
285	}
286	err = netlink_unicast(sock_diag_nlsk, rep, NETLINK_CB(in_skb).pid,
287			      MSG_DONTWAIT);
288	if (err > 0)
289		err = 0;
290out:
291	if (sk)
292		sock_put(sk);
293out_nosk:
294	return err;
295}
296
297static int unix_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
298{
299	int hdrlen = sizeof(struct unix_diag_req);
 
300
301	if (nlmsg_len(h) < hdrlen)
302		return -EINVAL;
303
304	if (h->nlmsg_flags & NLM_F_DUMP) {
305		struct netlink_dump_control c = {
306			.dump = unix_diag_dump,
307		};
308		return netlink_dump_start(sock_diag_nlsk, skb, h, &c);
309	} else
310		return unix_diag_get_exact(skb, h, (struct unix_diag_req *)NLMSG_DATA(h));
311}
312
313static const struct sock_diag_handler unix_diag_handler = {
314	.family = AF_UNIX,
315	.dump = unix_diag_handler_dump,
316};
317
318static int __init unix_diag_init(void)
319{
320	return sock_diag_register(&unix_diag_handler);
321}
322
323static void __exit unix_diag_exit(void)
324{
325	sock_diag_unregister(&unix_diag_handler);
326}
327
328module_init(unix_diag_init);
329module_exit(unix_diag_exit);
330MODULE_LICENSE("GPL");
331MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 1 /* AF_LOCAL */);