1
2#include <linux/types.h>
3#include <linux/spinlock.h>
4#include <linux/sock_diag.h>
5#include <linux/unix_diag.h>
6#include <linux/skbuff.h>
7#include <linux/module.h>
8#include <net/netlink.h>
9#include <net/af_unix.h>
10#include <net/tcp_states.h>
11
12static int sk_diag_dump_name(struct sock *sk, struct sk_buff *nlskb)
13{
14
15 struct unix_address *addr = smp_load_acquire(&unix_sk(sk)->addr);
16
17 if (!addr)
18 return 0;
19
20 return nla_put(nlskb, UNIX_DIAG_NAME, addr->len - sizeof(short),
21 addr->name->sun_path);
22}
23
24static int sk_diag_dump_vfs(struct sock *sk, struct sk_buff *nlskb)
25{
26 struct dentry *dentry = unix_sk(sk)->path.dentry;
27
28 if (dentry) {
29 struct unix_diag_vfs uv = {
30 .udiag_vfs_ino = d_backing_inode(dentry)->i_ino,
31 .udiag_vfs_dev = dentry->d_sb->s_dev,
32 };
33
34 return nla_put(nlskb, UNIX_DIAG_VFS, sizeof(uv), &uv);
35 }
36
37 return 0;
38}
39
40static int sk_diag_dump_peer(struct sock *sk, struct sk_buff *nlskb)
41{
42 struct sock *peer;
43 int ino;
44
45 peer = unix_peer_get(sk);
46 if (peer) {
47 unix_state_lock(peer);
48 ino = sock_i_ino(peer);
49 unix_state_unlock(peer);
50 sock_put(peer);
51
52 return nla_put_u32(nlskb, UNIX_DIAG_PEER, ino);
53 }
54
55 return 0;
56}
57
58static int sk_diag_dump_icons(struct sock *sk, struct sk_buff *nlskb)
59{
60 struct sk_buff *skb;
61 struct nlattr *attr;
62 u32 *buf;
63 int i;
64
65 if (sk->sk_state == TCP_LISTEN) {
66 spin_lock(&sk->sk_receive_queue.lock);
67
68 attr = nla_reserve(nlskb, UNIX_DIAG_ICONS,
69 sk->sk_receive_queue.qlen * sizeof(u32));
70 if (!attr)
71 goto errout;
72
73 buf = nla_data(attr);
74 i = 0;
75 skb_queue_walk(&sk->sk_receive_queue, skb) {
76 struct sock *req, *peer;
77
78 req = skb->sk;
79
80
81
82
83
84 unix_state_lock_nested(req);
85 peer = unix_sk(req)->peer;
86 buf[i++] = (peer ? sock_i_ino(peer) : 0);
87 unix_state_unlock(req);
88 }
89 spin_unlock(&sk->sk_receive_queue.lock);
90 }
91
92 return 0;
93
94errout:
95 spin_unlock(&sk->sk_receive_queue.lock);
96 return -EMSGSIZE;
97}
98
99static int sk_diag_show_rqlen(struct sock *sk, struct sk_buff *nlskb)
100{
101 struct unix_diag_rqlen rql;
102
103 if (sk->sk_state == TCP_LISTEN) {
104 rql.udiag_rqueue = sk->sk_receive_queue.qlen;
105 rql.udiag_wqueue = sk->sk_max_ack_backlog;
106 } else {
107 rql.udiag_rqueue = (u32) unix_inq_len(sk);
108 rql.udiag_wqueue = (u32) unix_outq_len(sk);
109 }
110
111 return nla_put(nlskb, UNIX_DIAG_RQLEN, sizeof(rql), &rql);
112}
113
114static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, struct unix_diag_req *req,
115 u32 portid, u32 seq, u32 flags, int sk_ino)
116{
117 struct nlmsghdr *nlh;
118 struct unix_diag_msg *rep;
119
120 nlh = nlmsg_put(skb, portid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rep),
121 flags);
122 if (!nlh)
123 return -EMSGSIZE;
124
125 rep = nlmsg_data(nlh);
126 rep->udiag_family = AF_UNIX;
127 rep->udiag_type = sk->sk_type;
128 rep->udiag_state = sk->sk_state;
129 rep->pad = 0;
130 rep->udiag_ino = sk_ino;
131 sock_diag_save_cookie(sk, rep->udiag_cookie);
132
133 if ((req->udiag_show & UDIAG_SHOW_NAME) &&
134 sk_diag_dump_name(sk, skb))
135 goto out_nlmsg_trim;
136
137 if ((req->udiag_show & UDIAG_SHOW_VFS) &&
138 sk_diag_dump_vfs(sk, skb))
139 goto out_nlmsg_trim;
140
141 if ((req->udiag_show & UDIAG_SHOW_PEER) &&
142 sk_diag_dump_peer(sk, skb))
143 goto out_nlmsg_trim;
144
145 if ((req->udiag_show & UDIAG_SHOW_ICONS) &&
146 sk_diag_dump_icons(sk, skb))
147 goto out_nlmsg_trim;
148
149 if ((req->udiag_show & UDIAG_SHOW_RQLEN) &&
150 sk_diag_show_rqlen(sk, skb))
151 goto out_nlmsg_trim;
152
153 if ((req->udiag_show & UDIAG_SHOW_MEMINFO) &&
154 sock_diag_put_meminfo(sk, skb, UNIX_DIAG_MEMINFO))
155 goto out_nlmsg_trim;
156
157 if (nla_put_u8(skb, UNIX_DIAG_SHUTDOWN, sk->sk_shutdown))
158 goto out_nlmsg_trim;
159
160 nlmsg_end(skb, nlh);
161 return 0;
162
163out_nlmsg_trim:
164 nlmsg_cancel(skb, nlh);
165 return -EMSGSIZE;
166}
167
168static int sk_diag_dump(struct sock *sk, struct sk_buff *skb, struct unix_diag_req *req,
169 u32 portid, u32 seq, u32 flags)
170{
171 int sk_ino;
172
173 unix_state_lock(sk);
174 sk_ino = sock_i_ino(sk);
175 unix_state_unlock(sk);
176
177 if (!sk_ino)
178 return 0;
179
180 return sk_diag_fill(sk, skb, req, portid, seq, flags, sk_ino);
181}
182
183static int unix_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
184{
185 struct unix_diag_req *req;
186 int num, s_num, slot, s_slot;
187 struct net *net = sock_net(skb->sk);
188
189 req = nlmsg_data(cb->nlh);
190
191 s_slot = cb->args[0];
192 num = s_num = cb->args[1];
193
194 spin_lock(&unix_table_lock);
195 for (slot = s_slot;
196 slot < ARRAY_SIZE(unix_socket_table);
197 s_num = 0, slot++) {
198 struct sock *sk;
199
200 num = 0;
201 sk_for_each(sk, &unix_socket_table[slot]) {
202 if (!net_eq(sock_net(sk), net))
203 continue;
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).portid,
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(unsigned int ino)
226{
227 int i;
228 struct sock *sk;
229
230 spin_lock(&unix_table_lock);
231 for (i = 0; i < ARRAY_SIZE(unix_socket_table); i++) {
232 sk_for_each(sk, &unix_socket_table[i])
233 if (ino == sock_i_ino(sk)) {
234 sock_hold(sk);
235 spin_unlock(&unix_table_lock);
236
237 return sk;
238 }
239 }
240
241 spin_unlock(&unix_table_lock);
242 return NULL;
243}
244
245static int unix_diag_get_exact(struct sk_buff *in_skb,
246 const struct nlmsghdr *nlh,
247 struct unix_diag_req *req)
248{
249 int err = -EINVAL;
250 struct sock *sk;
251 struct sk_buff *rep;
252 unsigned int extra_len;
253 struct net *net = sock_net(in_skb->sk);
254
255 if (req->udiag_ino == 0)
256 goto out_nosk;
257
258 sk = unix_lookup_by_ino(req->udiag_ino);
259 err = -ENOENT;
260 if (sk == NULL)
261 goto out_nosk;
262 if (!net_eq(sock_net(sk), net))
263 goto out;
264
265 err = sock_diag_check_cookie(sk, req->udiag_cookie);
266 if (err)
267 goto out;
268
269 extra_len = 256;
270again:
271 err = -ENOMEM;
272 rep = nlmsg_new(sizeof(struct unix_diag_msg) + extra_len, GFP_KERNEL);
273 if (!rep)
274 goto out;
275
276 err = sk_diag_fill(sk, rep, req, NETLINK_CB(in_skb).portid,
277 nlh->nlmsg_seq, 0, req->udiag_ino);
278 if (err < 0) {
279 nlmsg_free(rep);
280 extra_len += 256;
281 if (extra_len >= PAGE_SIZE)
282 goto out;
283
284 goto again;
285 }
286 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
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 struct net *net = sock_net(skb->sk);
301
302 if (nlmsg_len(h) < hdrlen)
303 return -EINVAL;
304
305 if (h->nlmsg_flags & NLM_F_DUMP) {
306 struct netlink_dump_control c = {
307 .dump = unix_diag_dump,
308 };
309 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
310 } else
311 return unix_diag_get_exact(skb, h, nlmsg_data(h));
312}
313
314static const struct sock_diag_handler unix_diag_handler = {
315 .family = AF_UNIX,
316 .dump = unix_diag_handler_dump,
317};
318
319static int __init unix_diag_init(void)
320{
321 return sock_diag_register(&unix_diag_handler);
322}
323
324static void __exit unix_diag_exit(void)
325{
326 sock_diag_unregister(&unix_diag_handler);
327}
328
329module_init(unix_diag_init);
330module_exit(unix_diag_exit);
331MODULE_LICENSE("GPL");
332MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 1
333
