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 = d_backing_inode(dentry)->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 portid, u32 seq, u32 flags, int sk_ino)
115 struct nlmsghdr *nlh;
116 struct unix_diag_msg *rep;
118 nlh = nlmsg_put(skb, portid, 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;
128 rep->udiag_ino = sk_ino;
129 sock_diag_save_cookie(sk, rep->udiag_cookie);
131 if ((req->udiag_show & UDIAG_SHOW_NAME) &&
132 sk_diag_dump_name(sk, skb))
135 if ((req->udiag_show & UDIAG_SHOW_VFS) &&
136 sk_diag_dump_vfs(sk, skb))
139 if ((req->udiag_show & UDIAG_SHOW_PEER) &&
140 sk_diag_dump_peer(sk, skb))
143 if ((req->udiag_show & UDIAG_SHOW_ICONS) &&
144 sk_diag_dump_icons(sk, skb))
147 if ((req->udiag_show & UDIAG_SHOW_RQLEN) &&
148 sk_diag_show_rqlen(sk, skb))
151 if ((req->udiag_show & UDIAG_SHOW_MEMINFO) &&
152 sock_diag_put_meminfo(sk, skb, UNIX_DIAG_MEMINFO))
155 if (nla_put_u8(skb, UNIX_DIAG_SHUTDOWN, sk->sk_shutdown))
162 nlmsg_cancel(skb, nlh);
166 static int sk_diag_dump(struct sock *sk, struct sk_buff *skb, struct unix_diag_req *req,
167 u32 portid, u32 seq, u32 flags)
172 sk_ino = sock_i_ino(sk);
173 unix_state_unlock(sk);
178 return sk_diag_fill(sk, skb, req, portid, seq, flags, sk_ino);
181 static int unix_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
183 struct unix_diag_req *req;
184 int num, s_num, slot, s_slot;
185 struct net *net = sock_net(skb->sk);
187 req = nlmsg_data(cb->nlh);
189 s_slot = cb->args[0];
190 num = s_num = cb->args[1];
192 spin_lock(&unix_table_lock);
194 slot < ARRAY_SIZE(unix_socket_table);
199 sk_for_each(sk, &unix_socket_table[slot]) {
200 if (!net_eq(sock_net(sk), net))
204 if (!(req->udiag_states & (1 << sk->sk_state)))
206 if (sk_diag_dump(sk, skb, req,
207 NETLINK_CB(cb->skb).portid,
216 spin_unlock(&unix_table_lock);
223 static struct sock *unix_lookup_by_ino(int ino)
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)) {
233 spin_unlock(&unix_table_lock);
239 spin_unlock(&unix_table_lock);
243 static int unix_diag_get_exact(struct sk_buff *in_skb,
244 const struct nlmsghdr *nlh,
245 struct unix_diag_req *req)
250 unsigned int extra_len;
251 struct net *net = sock_net(in_skb->sk);
253 if (req->udiag_ino == 0)
256 sk = unix_lookup_by_ino(req->udiag_ino);
261 err = sock_diag_check_cookie(sk, req->udiag_cookie);
268 rep = nlmsg_new(sizeof(struct unix_diag_msg) + extra_len, GFP_KERNEL);
272 err = sk_diag_fill(sk, rep, req, NETLINK_CB(in_skb).portid,
273 nlh->nlmsg_seq, 0, req->udiag_ino);
277 if (extra_len >= PAGE_SIZE)
282 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
293 static int unix_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
295 int hdrlen = sizeof(struct unix_diag_req);
296 struct net *net = sock_net(skb->sk);
298 if (nlmsg_len(h) < hdrlen)
301 if (h->nlmsg_flags & NLM_F_DUMP) {
302 struct netlink_dump_control c = {
303 .dump = unix_diag_dump,
305 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
307 return unix_diag_get_exact(skb, h, nlmsg_data(h));
310 static const struct sock_diag_handler unix_diag_handler = {
312 .dump = unix_diag_handler_dump,
315 static int __init unix_diag_init(void)
317 return sock_diag_register(&unix_diag_handler);
320 static void __exit unix_diag_exit(void)
322 sock_diag_unregister(&unix_diag_handler);
325 module_init(unix_diag_init);
326 module_exit(unix_diag_exit);
327 MODULE_LICENSE("GPL");
328 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 1 /* AF_LOCAL */);