unix_diag: Basic module skeleton

Includes basic module_init/_exit functionality, dump/get_exact stubs
and declares the basic API structures for request and response.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/unix_diag.h b/include/linux/unix_diag.h
new file mode 100644 (file)
index 0000000..445184a
--- /dev/null
+++ b/include/linux/unix_diag.h
@@ -0,0 +1,24 @@
+#ifndef __UNIX_DIAG_H__
+#define __UNIX_DIAG_H__
+
+struct unix_diag_req {
+       __u8    sdiag_family;
+       __u8    sdiag_protocol;
+       __u16   pad;
+       __u32   udiag_states;
+       __u32   udiag_ino;
+       __u32   udiag_show;
+       __u32   udiag_cookie[2];
+};
+
+struct unix_diag_msg {
+       __u8    udiag_family;
+       __u8    udiag_type;
+       __u8    udiag_state;
+       __u8    pad;
+
+       __u32   udiag_ino;
+       __u32   udiag_cookie[2];
+};
+
+#endif

diff --git a/net/unix/diag.c b/net/unix/diag.c
new file mode 100644 (file)
index 0000000..6be16c0
--- /dev/null
+++ b/net/unix/diag.c
@@ -0,0 +1,57 @@
+#include <linux/types.h>
+#include <linux/spinlock.h>
+#include <linux/sock_diag.h>
+#include <linux/unix_diag.h>
+#include <linux/skbuff.h>
+#include <net/netlink.h>
+#include <net/af_unix.h>
+#include <net/tcp_states.h>
+
+#define UNIX_DIAG_PUT(skb, attrtype, attrlen) \
+       RTA_DATA(__RTA_PUT(skb, attrtype, attrlen))
+
+static int unix_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
+{
+       return 0;
+}
+
+static int unix_diag_get_exact(struct sk_buff *in_skb,
+                              const struct nlmsghdr *nlh,
+                              struct unix_diag_req *req)
+{
+       return -EAFNOSUPPORT;
+}
+
+static int unix_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
+{
+       int hdrlen = sizeof(struct unix_diag_req);
+
+       if (nlmsg_len(h) < hdrlen)
+               return -EINVAL;
+
+       if (h->nlmsg_flags & NLM_F_DUMP)
+               return netlink_dump_start(sock_diag_nlsk, skb, h,
+                                         unix_diag_dump, NULL, 0);
+       else
+               return unix_diag_get_exact(skb, h, (struct unix_diag_req *)NLMSG_DATA(h));
+}
+
+static struct sock_diag_handler unix_diag_handler = {
+       .family = AF_UNIX,
+       .dump = unix_diag_handler_dump,
+};
+
+static int __init unix_diag_init(void)
+{
+       return sock_diag_register(&unix_diag_handler);
+}
+
+static void __exit unix_diag_exit(void)
+{
+       sock_diag_unregister(&unix_diag_handler);
+}
+
+module_init(unix_diag_init);
+module_exit(unix_diag_exit);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 1 /* AF_LOCAL */);