blob: 06748f108a5732e9f847cdffd0dafe0cb996c191 [file] [log] [blame]
Pavel Emelyanov22931d32011-12-15 02:44:35 +00001#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>
Cyrill Gorcunov2ea744a2011-12-20 04:33:03 +00006#include <linux/module.h>
Pavel Emelyanov22931d32011-12-15 02:44:35 +00007#include <net/netlink.h>
8#include <net/af_unix.h>
9#include <net/tcp_states.h>
10
Pavel Emelyanovf5248b42011-12-15 02:45:24 +000011static int sk_diag_dump_name(struct sock *sk, struct sk_buff *nlskb)
12{
13 struct unix_address *addr = unix_sk(sk)->addr;
Pavel Emelyanovf5248b42011-12-15 02:45:24 +000014
Thomas Graf42453752012-06-26 23:36:10 +000015 if (!addr)
16 return 0;
Pavel Emelyanovf5248b42011-12-15 02:45:24 +000017
Thomas Graf42453752012-06-26 23:36:10 +000018 return nla_put(nlskb, UNIX_DIAG_NAME, addr->len - sizeof(short),
19 addr->name->sun_path);
Pavel Emelyanovf5248b42011-12-15 02:45:24 +000020}
21
Pavel Emelyanov5f7b0562011-12-15 02:45:43 +000022static int sk_diag_dump_vfs(struct sock *sk, struct sk_buff *nlskb)
23{
Al Viro40ffe672012-03-14 21:54:32 -040024 struct dentry *dentry = unix_sk(sk)->path.dentry;
Pavel Emelyanov5f7b0562011-12-15 02:45:43 +000025
26 if (dentry) {
Thomas Graf42453752012-06-26 23:36:10 +000027 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);
Pavel Emelyanov5f7b0562011-12-15 02:45:43 +000033 }
34
35 return 0;
Pavel Emelyanov5f7b0562011-12-15 02:45:43 +000036}
37
Pavel Emelyanovac02be82011-12-15 02:45:58 +000038static 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
Thomas Graf42453752012-06-26 23:36:10 +000050 return nla_put_u32(nlskb, UNIX_DIAG_PEER, ino);
Pavel Emelyanovac02be82011-12-15 02:45:58 +000051 }
52
53 return 0;
Pavel Emelyanovac02be82011-12-15 02:45:58 +000054}
55
Pavel Emelyanov2aac7a22011-12-15 02:46:14 +000056static int sk_diag_dump_icons(struct sock *sk, struct sk_buff *nlskb)
57{
58 struct sk_buff *skb;
Thomas Graf42453752012-06-26 23:36:10 +000059 struct nlattr *attr;
Pavel Emelyanov2aac7a22011-12-15 02:46:14 +000060 u32 *buf;
61 int i;
62
63 if (sk->sk_state == TCP_LISTEN) {
64 spin_lock(&sk->sk_receive_queue.lock);
Thomas Graf42453752012-06-26 23:36:10 +000065
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);
Pavel Emelyanov2aac7a22011-12-15 02:46:14 +000072 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;
David S. Millere09e9d12011-12-26 14:41:55 -050084 buf[i++] = (peer ? sock_i_ino(peer) : 0);
Pavel Emelyanov2aac7a22011-12-15 02:46:14 +000085 unix_state_unlock(req);
86 }
87 spin_unlock(&sk->sk_receive_queue.lock);
88 }
89
90 return 0;
91
Thomas Graf42453752012-06-26 23:36:10 +000092errout:
Pavel Emelyanov2aac7a22011-12-15 02:46:14 +000093 spin_unlock(&sk->sk_receive_queue.lock);
94 return -EMSGSIZE;
95}
96
Pavel Emelyanovcbf39192011-12-15 02:46:31 +000097static int sk_diag_show_rqlen(struct sock *sk, struct sk_buff *nlskb)
98{
Thomas Graf42453752012-06-26 23:36:10 +000099 struct unix_diag_rqlen rql;
Pavel Emelyanovc9da99e2011-12-30 00:54:39 +0000100
101 if (sk->sk_state == TCP_LISTEN) {
Thomas Graf42453752012-06-26 23:36:10 +0000102 rql.udiag_rqueue = sk->sk_receive_queue.qlen;
103 rql.udiag_wqueue = sk->sk_max_ack_backlog;
Pavel Emelyanovc9da99e2011-12-30 00:54:39 +0000104 } else {
Thomas Graf42453752012-06-26 23:36:10 +0000105 rql.udiag_rqueue = (u32) unix_inq_len(sk);
106 rql.udiag_wqueue = (u32) unix_outq_len(sk);
Pavel Emelyanovc9da99e2011-12-30 00:54:39 +0000107 }
108
Thomas Graf42453752012-06-26 23:36:10 +0000109 return nla_put(nlskb, UNIX_DIAG_RQLEN, sizeof(rql), &rql);
Pavel Emelyanovcbf39192011-12-15 02:46:31 +0000110}
111
Pavel Emelyanov45a96b92011-12-15 02:44:52 +0000112static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, struct unix_diag_req *req,
Eric W. Biederman15e47302012-09-07 20:12:54 +0000113 u32 portid, u32 seq, u32 flags, int sk_ino)
Pavel Emelyanov45a96b92011-12-15 02:44:52 +0000114{
Pavel Emelyanov45a96b92011-12-15 02:44:52 +0000115 struct nlmsghdr *nlh;
116 struct unix_diag_msg *rep;
117
Eric W. Biederman15e47302012-09-07 20:12:54 +0000118 nlh = nlmsg_put(skb, portid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rep),
Thomas Graf42453752012-06-26 23:36:10 +0000119 flags);
David S. Millerb61bb012012-06-26 21:41:00 -0700120 if (!nlh)
Thomas Graf42453752012-06-26 23:36:10 +0000121 return -EMSGSIZE;
Pavel Emelyanov45a96b92011-12-15 02:44:52 +0000122
David S. Millerb61bb012012-06-26 21:41:00 -0700123 rep = nlmsg_data(nlh);
Pavel Emelyanov45a96b92011-12-15 02:44:52 +0000124 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
Pavel Emelyanovf5248b42011-12-15 02:45:24 +0000130 if ((req->udiag_show & UDIAG_SHOW_NAME) &&
Pavel Emelyanov257b5292011-12-30 09:27:43 +0000131 sk_diag_dump_name(sk, skb))
David S. Millerb61bb012012-06-26 21:41:00 -0700132 goto out_nlmsg_trim;
Pavel Emelyanovf5248b42011-12-15 02:45:24 +0000133
Pavel Emelyanov5f7b0562011-12-15 02:45:43 +0000134 if ((req->udiag_show & UDIAG_SHOW_VFS) &&
Pavel Emelyanov257b5292011-12-30 09:27:43 +0000135 sk_diag_dump_vfs(sk, skb))
David S. Millerb61bb012012-06-26 21:41:00 -0700136 goto out_nlmsg_trim;
Pavel Emelyanov5f7b0562011-12-15 02:45:43 +0000137
Pavel Emelyanovac02be82011-12-15 02:45:58 +0000138 if ((req->udiag_show & UDIAG_SHOW_PEER) &&
Pavel Emelyanov257b5292011-12-30 09:27:43 +0000139 sk_diag_dump_peer(sk, skb))
David S. Millerb61bb012012-06-26 21:41:00 -0700140 goto out_nlmsg_trim;
Pavel Emelyanovac02be82011-12-15 02:45:58 +0000141
Pavel Emelyanov2aac7a22011-12-15 02:46:14 +0000142 if ((req->udiag_show & UDIAG_SHOW_ICONS) &&
Pavel Emelyanov257b5292011-12-30 09:27:43 +0000143 sk_diag_dump_icons(sk, skb))
David S. Millerb61bb012012-06-26 21:41:00 -0700144 goto out_nlmsg_trim;
Pavel Emelyanov2aac7a22011-12-15 02:46:14 +0000145
Pavel Emelyanovcbf39192011-12-15 02:46:31 +0000146 if ((req->udiag_show & UDIAG_SHOW_RQLEN) &&
Pavel Emelyanov257b5292011-12-30 09:27:43 +0000147 sk_diag_show_rqlen(sk, skb))
David S. Millerb61bb012012-06-26 21:41:00 -0700148 goto out_nlmsg_trim;
Pavel Emelyanov257b5292011-12-30 09:27:43 +0000149
150 if ((req->udiag_show & UDIAG_SHOW_MEMINFO) &&
151 sock_diag_put_meminfo(sk, skb, UNIX_DIAG_MEMINFO))
David S. Millerb61bb012012-06-26 21:41:00 -0700152 goto out_nlmsg_trim;
Pavel Emelyanovcbf39192011-12-15 02:46:31 +0000153
Thomas Graf42453752012-06-26 23:36:10 +0000154 return nlmsg_end(skb, nlh);
Pavel Emelyanov45a96b92011-12-15 02:44:52 +0000155
David S. Millerb61bb012012-06-26 21:41:00 -0700156out_nlmsg_trim:
Thomas Graf42453752012-06-26 23:36:10 +0000157 nlmsg_cancel(skb, nlh);
Pavel Emelyanov45a96b92011-12-15 02:44:52 +0000158 return -EMSGSIZE;
159}
160
161static int sk_diag_dump(struct sock *sk, struct sk_buff *skb, struct unix_diag_req *req,
Eric W. Biederman15e47302012-09-07 20:12:54 +0000162 u32 portid, u32 seq, u32 flags)
Pavel Emelyanov45a96b92011-12-15 02:44:52 +0000163{
164 int sk_ino;
165
166 unix_state_lock(sk);
167 sk_ino = sock_i_ino(sk);
168 unix_state_unlock(sk);
169
170 if (!sk_ino)
171 return 0;
172
Eric W. Biederman15e47302012-09-07 20:12:54 +0000173 return sk_diag_fill(sk, skb, req, portid, seq, flags, sk_ino);
Pavel Emelyanov45a96b92011-12-15 02:44:52 +0000174}
175
Pavel Emelyanov22931d32011-12-15 02:44:35 +0000176static int unix_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
177{
Pavel Emelyanov45a96b92011-12-15 02:44:52 +0000178 struct unix_diag_req *req;
179 int num, s_num, slot, s_slot;
Andrey Vagin51d7ccc2012-07-16 04:28:49 +0000180 struct net *net = sock_net(skb->sk);
Pavel Emelyanov45a96b92011-12-15 02:44:52 +0000181
David S. Millerb61bb012012-06-26 21:41:00 -0700182 req = nlmsg_data(cb->nlh);
Pavel Emelyanov45a96b92011-12-15 02:44:52 +0000183
184 s_slot = cb->args[0];
185 num = s_num = cb->args[1];
186
187 spin_lock(&unix_table_lock);
Eric Dumazet7123aaa2012-06-08 05:03:21 +0000188 for (slot = s_slot;
189 slot < ARRAY_SIZE(unix_socket_table);
190 s_num = 0, slot++) {
Pavel Emelyanov45a96b92011-12-15 02:44:52 +0000191 struct sock *sk;
192 struct hlist_node *node;
193
194 num = 0;
195 sk_for_each(sk, node, &unix_socket_table[slot]) {
Andrey Vagin51d7ccc2012-07-16 04:28:49 +0000196 if (!net_eq(sock_net(sk), net))
197 continue;
Pavel Emelyanov45a96b92011-12-15 02:44:52 +0000198 if (num < s_num)
199 goto next;
200 if (!(req->udiag_states & (1 << sk->sk_state)))
201 goto next;
202 if (sk_diag_dump(sk, skb, req,
Eric W. Biederman15e47302012-09-07 20:12:54 +0000203 NETLINK_CB(cb->skb).portid,
Pavel Emelyanov257b5292011-12-30 09:27:43 +0000204 cb->nlh->nlmsg_seq,
205 NLM_F_MULTI) < 0)
Pavel Emelyanov45a96b92011-12-15 02:44:52 +0000206 goto done;
207next:
208 num++;
209 }
210 }
211done:
212 spin_unlock(&unix_table_lock);
213 cb->args[0] = slot;
214 cb->args[1] = num;
215
216 return skb->len;
Pavel Emelyanov22931d32011-12-15 02:44:35 +0000217}
218
Pavel Emelyanov5d3cae82011-12-15 02:45:07 +0000219static struct sock *unix_lookup_by_ino(int ino)
220{
221 int i;
222 struct sock *sk;
223
224 spin_lock(&unix_table_lock);
Eric Dumazet7123aaa2012-06-08 05:03:21 +0000225 for (i = 0; i < ARRAY_SIZE(unix_socket_table); i++) {
Pavel Emelyanov5d3cae82011-12-15 02:45:07 +0000226 struct hlist_node *node;
227
228 sk_for_each(sk, node, &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
Pavel Emelyanov22931d32011-12-15 02:44:35 +0000241static int unix_diag_get_exact(struct sk_buff *in_skb,
242 const struct nlmsghdr *nlh,
243 struct unix_diag_req *req)
244{
Pavel Emelyanov5d3cae82011-12-15 02:45:07 +0000245 int err = -EINVAL;
246 struct sock *sk;
247 struct sk_buff *rep;
248 unsigned int extra_len;
Andrey Vagin51d7ccc2012-07-16 04:28:49 +0000249 struct net *net = sock_net(in_skb->sk);
Pavel Emelyanov5d3cae82011-12-15 02:45:07 +0000250
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;
Thomas Graf42453752012-06-26 23:36:10 +0000266 rep = nlmsg_new(sizeof(struct unix_diag_msg) + extra_len, GFP_KERNEL);
Pavel Emelyanov5d3cae82011-12-15 02:45:07 +0000267 if (!rep)
268 goto out;
269
Eric W. Biederman15e47302012-09-07 20:12:54 +0000270 err = sk_diag_fill(sk, rep, req, NETLINK_CB(in_skb).portid,
Pavel Emelyanov5d3cae82011-12-15 02:45:07 +0000271 nlh->nlmsg_seq, 0, req->udiag_ino);
272 if (err < 0) {
Thomas Graf42453752012-06-26 23:36:10 +0000273 nlmsg_free(rep);
Pavel Emelyanov5d3cae82011-12-15 02:45:07 +0000274 extra_len += 256;
275 if (extra_len >= PAGE_SIZE)
276 goto out;
277
278 goto again;
279 }
Eric W. Biederman15e47302012-09-07 20:12:54 +0000280 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
Pavel Emelyanov5d3cae82011-12-15 02:45:07 +0000281 MSG_DONTWAIT);
282 if (err > 0)
283 err = 0;
284out:
285 if (sk)
286 sock_put(sk);
287out_nosk:
288 return err;
Pavel Emelyanov22931d32011-12-15 02:44:35 +0000289}
290
291static int unix_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
292{
293 int hdrlen = sizeof(struct unix_diag_req);
Andrey Vagin51d7ccc2012-07-16 04:28:49 +0000294 struct net *net = sock_net(skb->sk);
Pavel Emelyanov22931d32011-12-15 02:44:35 +0000295
296 if (nlmsg_len(h) < hdrlen)
297 return -EINVAL;
298
Pablo Neira Ayuso80d326f2012-02-24 14:30:15 +0000299 if (h->nlmsg_flags & NLM_F_DUMP) {
300 struct netlink_dump_control c = {
301 .dump = unix_diag_dump,
302 };
Andrey Vagin51d7ccc2012-07-16 04:28:49 +0000303 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
Pablo Neira Ayuso80d326f2012-02-24 14:30:15 +0000304 } else
David S. Millerb61bb012012-06-26 21:41:00 -0700305 return unix_diag_get_exact(skb, h, nlmsg_data(h));
Pavel Emelyanov22931d32011-12-15 02:44:35 +0000306}
307
Shan Wei8dcf01f2012-04-24 18:21:07 +0000308static const struct sock_diag_handler unix_diag_handler = {
Pavel Emelyanov22931d32011-12-15 02:44:35 +0000309 .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 /* AF_LOCAL */);