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>
11 static int sk_diag_dump_name(struct sock *sk, struct sk_buff *nlskb)
13 struct unix_address *addr = unix_sk(sk)->addr;
18 return nla_put(nlskb, UNIX_DIAG_NAME, addr->len - sizeof(short),
19 addr->name->sun_path);
22 static int sk_diag_dump_vfs(struct sock *sk, struct sk_buff *nlskb)
24 struct dentry *dentry = unix_sk(sk)->path.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,
32 return nla_put(nlskb, UNIX_DIAG_VFS, sizeof(uv), &uv);
38 static int sk_diag_dump_peer(struct sock *sk, struct sk_buff *nlskb)
43 peer = unix_peer_get(sk);
45 unix_state_lock(peer);
46 ino = sock_i_ino(peer);
47 unix_state_unlock(peer);
50 return nla_put_u32(nlskb, UNIX_DIAG_PEER, ino);
56 static int sk_diag_dump_icons(struct sock *sk, struct sk_buff *nlskb)
63 if (sk->sk_state == TCP_LISTEN) {
64 spin_lock(&sk->sk_receive_queue.lock);
66 attr = nla_reserve(nlskb, UNIX_DIAG_ICONS,
67 sk->sk_receive_queue.qlen * sizeof(u32));
73 skb_queue_walk(&sk->sk_receive_queue, skb) {
74 struct sock *req, *peer;
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.
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);
87 spin_unlock(&sk->sk_receive_queue.lock);
93 spin_unlock(&sk->sk_receive_queue.lock);
97 static int sk_diag_show_rqlen(struct sock *sk, struct sk_buff *nlskb)
99 struct unix_diag_rqlen rql;
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;
105 rql.udiag_rqueue = (u32) unix_inq_len(sk);
106 rql.udiag_wqueue = (u32) unix_outq_len(sk);
109 return nla_put(nlskb, UNIX_DIAG_RQLEN, sizeof(rql), &rql);
112 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, struct unix_diag_req *req,
113 u32 pid, u32 seq, u32 flags, int sk_ino)
115 struct nlmsghdr *nlh;
116 struct unix_diag_msg *rep;
118 nlh = nlmsg_put(skb, pid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rep),
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);
130 if ((req->udiag_show & UDIAG_SHOW_NAME) &&
131 sk_diag_dump_name(sk, skb))
134 if ((req->udiag_show & UDIAG_SHOW_VFS) &&
135 sk_diag_dump_vfs(sk, skb))
138 if ((req->udiag_show & UDIAG_SHOW_PEER) &&
139 sk_diag_dump_peer(sk, skb))
142 if ((req->udiag_show & UDIAG_SHOW_ICONS) &&
143 sk_diag_dump_icons(sk, skb))
146 if ((req->udiag_show & UDIAG_SHOW_RQLEN) &&
147 sk_diag_show_rqlen(sk, skb))
150 if ((req->udiag_show & UDIAG_SHOW_MEMINFO) &&
151 sock_diag_put_meminfo(sk, skb, UNIX_DIAG_MEMINFO))
154 return nlmsg_end(skb, nlh);
157 nlmsg_cancel(skb, nlh);
161 static int sk_diag_dump(struct sock *sk, struct sk_buff *skb, struct unix_diag_req *req,
162 u32 pid, u32 seq, u32 flags)
167 sk_ino = sock_i_ino(sk);
168 unix_state_unlock(sk);
173 return sk_diag_fill(sk, skb, req, pid, seq, flags, sk_ino);
176 static int unix_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
178 struct unix_diag_req *req;
179 int num, s_num, slot, s_slot;
181 req = nlmsg_data(cb->nlh);
183 s_slot = cb->args[0];
184 num = s_num = cb->args[1];
186 spin_lock(&unix_table_lock);
188 slot < ARRAY_SIZE(unix_socket_table);
191 struct hlist_node *node;
194 sk_for_each(sk, node, &unix_socket_table[slot]) {
197 if (!(req->udiag_states & (1 << sk->sk_state)))
199 if (sk_diag_dump(sk, skb, req,
200 NETLINK_CB(cb->skb).pid,
209 spin_unlock(&unix_table_lock);
216 static struct sock *unix_lookup_by_ino(int ino)
221 spin_lock(&unix_table_lock);
222 for (i = 0; i < ARRAY_SIZE(unix_socket_table); i++) {
223 struct hlist_node *node;
225 sk_for_each(sk, node, &unix_socket_table[i])
226 if (ino == sock_i_ino(sk)) {
228 spin_unlock(&unix_table_lock);
234 spin_unlock(&unix_table_lock);
238 static int unix_diag_get_exact(struct sk_buff *in_skb,
239 const struct nlmsghdr *nlh,
240 struct unix_diag_req *req)
245 unsigned int extra_len;
247 if (req->udiag_ino == 0)
250 sk = unix_lookup_by_ino(req->udiag_ino);
255 err = sock_diag_check_cookie(sk, req->udiag_cookie);
262 rep = nlmsg_new(sizeof(struct unix_diag_msg) + extra_len, GFP_KERNEL);
266 err = sk_diag_fill(sk, rep, req, NETLINK_CB(in_skb).pid,
267 nlh->nlmsg_seq, 0, req->udiag_ino);
271 if (extra_len >= PAGE_SIZE)
276 err = netlink_unicast(sock_diag_nlsk, rep, NETLINK_CB(in_skb).pid,
287 static int unix_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
289 int hdrlen = sizeof(struct unix_diag_req);
291 if (nlmsg_len(h) < hdrlen)
294 if (h->nlmsg_flags & NLM_F_DUMP) {
295 struct netlink_dump_control c = {
296 .dump = unix_diag_dump,
298 return netlink_dump_start(sock_diag_nlsk, skb, h, &c);
300 return unix_diag_get_exact(skb, h, nlmsg_data(h));
303 static const struct sock_diag_handler unix_diag_handler = {
305 .dump = unix_diag_handler_dump,
308 static int __init unix_diag_init(void)
310 return sock_diag_register(&unix_diag_handler);
313 static void __exit unix_diag_exit(void)
315 sock_diag_unregister(&unix_diag_handler);
318 module_init(unix_diag_init);
319 module_exit(unix_diag_exit);
320 MODULE_LICENSE("GPL");
321 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 1 /* AF_LOCAL */);