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 = dentry->d_inode->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
79
80
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->udiag_ino = sk_ino;
128 sock_diag_save_cookie(sk, rep->udiag_cookie);
129
130 if ((req->udiag_show & UDIAG_SHOW_NAME) &&
131 sk_diag_dump_name(sk, skb))
132 goto out_nlmsg_trim;
133
134 if ((req->udiag_show & UDIAG_SHOW_VFS) &&
135 sk_diag_dump_vfs(sk, skb))
136 goto out_nlmsg_trim;
137
138 if ((req->udiag_show & UDIAG_SHOW_PEER) &&
139 sk_diag_dump_peer(sk, skb))
140 goto out_nlmsg_trim;
141
142 if ((req->udiag_show & UDIAG_SHOW_ICONS) &&
143 sk_diag_dump_icons(sk, skb))
144 goto out_nlmsg_trim;
145
146 if ((req->udiag_show & UDIAG_SHOW_RQLEN) &&
147 sk_diag_show_rqlen(sk, skb))
148 goto out_nlmsg_trim;
149
150 if ((req->udiag_show & UDIAG_SHOW_MEMINFO) &&
151 sock_diag_put_meminfo(sk, skb, UNIX_DIAG_MEMINFO))
152 goto out_nlmsg_trim;
153
154 if (nla_put_u8(skb, UNIX_DIAG_SHUTDOWN, sk->sk_shutdown))
155 goto out_nlmsg_trim;
156
157 return nlmsg_end(skb, nlh);
158
159out_nlmsg_trim:
160 nlmsg_cancel(skb, nlh);
161 return -EMSGSIZE;
162}
163
164static int sk_diag_dump(struct sock *sk, struct sk_buff *skb, struct unix_diag_req *req,
165 u32 portid, u32 seq, u32 flags)
166{
167 int sk_ino;
168
169 unix_state_lock(sk);
170 sk_ino = sock_i_ino(sk);
171 unix_state_unlock(sk);
172
173 if (!sk_ino)
174 return 0;
175
176 return sk_diag_fill(sk, skb, req, portid, seq, flags, sk_ino);
177}
178
179static int unix_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
180{
181 struct unix_diag_req *req;
182 int num, s_num, slot, s_slot;
183 struct net *net = sock_net(skb->sk);
184
185 req = nlmsg_data(cb->nlh);
186
187 s_slot = cb->args[0];
188 num = s_num = cb->args[1];
189
190 spin_lock(&unix_table_lock);
191 for (slot = s_slot;
192 slot < ARRAY_SIZE(unix_socket_table);
193 s_num = 0, slot++) {
194 struct sock *sk;
195
196 num = 0;
197 sk_for_each(sk, &unix_socket_table[slot]) {
198 if (!net_eq(sock_net(sk), net))
199 continue;
200 if (num < s_num)
201 goto next;
202 if (!(req->udiag_states & (1 << sk->sk_state)))
203 goto next;
204 if (sk_diag_dump(sk, skb, req,
205 NETLINK_CB(cb->skb).portid,
206 cb->nlh->nlmsg_seq,
207 NLM_F_MULTI) < 0)
208 goto done;
209next:
210 num++;
211 }
212 }
213done:
214 spin_unlock(&unix_table_lock);
215 cb->args[0] = slot;
216 cb->args[1] = num;
217
218 return skb->len;
219}
220
221static struct sock *unix_lookup_by_ino(int ino)
222{
223 int i;
224 struct sock *sk;
225
226 spin_lock(&unix_table_lock);
227 for (i = 0; i < ARRAY_SIZE(unix_socket_table); i++) {
228 sk_for_each(sk, &unix_socket_table[i])
229 if (ino == sock_i_ino(sk)) {
230 sock_hold(sk);
231 spin_unlock(&unix_table_lock);
232
233 return sk;
234 }
235 }
236
237 spin_unlock(&unix_table_lock);
238 return NULL;
239}
240
241static int unix_diag_get_exact(struct sk_buff *in_skb,
242 const struct nlmsghdr *nlh,
243 struct unix_diag_req *req)
244{
245 int err = -EINVAL;
246 struct sock *sk;
247 struct sk_buff *rep;
248 unsigned int extra_len;
249 struct net *net = sock_net(in_skb->sk);
250
251 if (req->udiag_ino == 0)
252 goto out_nosk;
253
254 sk = unix_lookup_by_ino(req->udiag_ino);
255 err = -ENOENT;
256 if (sk == NULL)
257 goto out_nosk;
258
259 err = sock_diag_check_cookie(sk, req->udiag_cookie);
260 if (err)
261 goto out;
262
263 extra_len = 256;
264again:
265 err = -ENOMEM;
266 rep = nlmsg_new(sizeof(struct unix_diag_msg) + extra_len, GFP_KERNEL);
267 if (!rep)
268 goto out;
269
270 err = sk_diag_fill(sk, rep, req, NETLINK_CB(in_skb).portid,
271 nlh->nlmsg_seq, 0, req->udiag_ino);
272 if (err < 0) {
273 nlmsg_free(rep);
274 extra_len += 256;
275 if (extra_len >= PAGE_SIZE)
276 goto out;
277
278 goto again;
279 }
280 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
281 MSG_DONTWAIT);
282 if (err > 0)
283 err = 0;
284out:
285 if (sk)
286 sock_put(sk);
287out_nosk:
288 return err;
289}
290
291static int unix_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
292{
293 int hdrlen = sizeof(struct unix_diag_req);
294 struct net *net = sock_net(skb->sk);
295
296 if (nlmsg_len(h) < hdrlen)
297 return -EINVAL;
298
299 if (h->nlmsg_flags & NLM_F_DUMP) {
300 struct netlink_dump_control c = {
301 .dump = unix_diag_dump,
302 };
303 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
304 } else
305 return unix_diag_get_exact(skb, h, nlmsg_data(h));
306}
307
308static const struct sock_diag_handler unix_diag_handler = {
309 .family = AF_UNIX,
310 .dump = unix_diag_handler_dump,
311};
312
313static int __init unix_diag_init(void)
314{
315 return sock_diag_register(&unix_diag_handler);
316}
317
318static void __exit unix_diag_exit(void)
319{
320 sock_diag_unregister(&unix_diag_handler);
321}
322
323module_init(unix_diag_init);
324module_exit(unix_diag_exit);
325MODULE_LICENSE("GPL");
326MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 1
327
