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authorPavel Emelyanov <xemul@parallels.com>2011-12-06 11:59:52 +0400
committerDavid S. Miller <davem@davemloft.net>2011-12-06 22:58:02 +0400
commit8ef874bfc7296fa206eea2ad1e8a426f576bf6f6 (patch)
tree1746f3acd306c55bff845a56e783ec6f1bd6fc6e /net/core/sock_diag.c
parenta029fe26b67f815eddd432d9e702b9f2edbc2535 (diff)
downloadlinux-8ef874bfc7296fa206eea2ad1e8a426f576bf6f6.tar.xz
sock_diag: Move the sock_ code to net/core/
This patch moves the sock_ code from inet_diag.c to generic sock_diag.c file and provides necessary request_module-s calls and a pointer on inet_diag_compat dumping routine. Signed-off-by: Pavel Emelyanov <xemul@parallels.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/sock_diag.c')
-rw-r--r--net/core/sock_diag.c150
1 files changed, 150 insertions, 0 deletions
diff --git a/net/core/sock_diag.c b/net/core/sock_diag.c
new file mode 100644
index 000000000000..fbaf01ce12f2
--- /dev/null
+++ b/net/core/sock_diag.c
@@ -0,0 +1,150 @@
+#include <linux/mutex.h>
+#include <linux/socket.h>
+#include <linux/skbuff.h>
+#include <net/netlink.h>
+#include <net/net_namespace.h>
+#include <linux/module.h>
+
+#include <linux/inet_diag.h>
+#include <linux/sock_diag.h>
+
+static struct sock_diag_handler *sock_diag_handlers[AF_MAX];
+static int (*inet_rcv_compat)(struct sk_buff *skb, struct nlmsghdr *nlh);
+static DEFINE_MUTEX(sock_diag_table_mutex);
+
+void sock_diag_register_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh))
+{
+ mutex_lock(&sock_diag_table_mutex);
+ inet_rcv_compat = fn;
+ mutex_unlock(&sock_diag_table_mutex);
+}
+EXPORT_SYMBOL_GPL(sock_diag_register_inet_compat);
+
+void sock_diag_unregister_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh))
+{
+ mutex_lock(&sock_diag_table_mutex);
+ inet_rcv_compat = NULL;
+ mutex_unlock(&sock_diag_table_mutex);
+}
+EXPORT_SYMBOL_GPL(sock_diag_unregister_inet_compat);
+
+int sock_diag_register(struct sock_diag_handler *hndl)
+{
+ int err = 0;
+
+ if (hndl->family > AF_MAX)
+ return -EINVAL;
+
+ mutex_lock(&sock_diag_table_mutex);
+ if (sock_diag_handlers[hndl->family])
+ err = -EBUSY;
+ else
+ sock_diag_handlers[hndl->family] = hndl;
+ mutex_unlock(&sock_diag_table_mutex);
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(sock_diag_register);
+
+void sock_diag_unregister(struct sock_diag_handler *hnld)
+{
+ int family = hnld->family;
+
+ if (family > AF_MAX)
+ return;
+
+ mutex_lock(&sock_diag_table_mutex);
+ BUG_ON(sock_diag_handlers[family] != hnld);
+ sock_diag_handlers[family] = NULL;
+ mutex_unlock(&sock_diag_table_mutex);
+}
+EXPORT_SYMBOL_GPL(sock_diag_unregister);
+
+static inline struct sock_diag_handler *sock_diag_lock_handler(int family)
+{
+ if (sock_diag_handlers[family] == NULL)
+ request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
+ NETLINK_SOCK_DIAG, IPPROTO_IP);
+
+ mutex_lock(&sock_diag_table_mutex);
+ return sock_diag_handlers[family];
+}
+
+static inline void sock_diag_unlock_handler(struct sock_diag_handler *h)
+{
+ mutex_unlock(&sock_diag_table_mutex);
+}
+
+static int __sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
+{
+ int err;
+ struct sock_diag_req *req = NLMSG_DATA(nlh);
+ struct sock_diag_handler *hndl;
+
+ if (nlmsg_len(nlh) < sizeof(*req))
+ return -EINVAL;
+
+ hndl = sock_diag_lock_handler(req->sdiag_family);
+ if (hndl == NULL)
+ err = -ENOENT;
+ else
+ err = hndl->dump(skb, nlh);
+ sock_diag_unlock_handler(hndl);
+
+ return err;
+}
+
+static int sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
+{
+ int ret;
+
+ switch (nlh->nlmsg_type) {
+ case TCPDIAG_GETSOCK:
+ case DCCPDIAG_GETSOCK:
+ if (inet_rcv_compat == NULL)
+ request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
+ NETLINK_SOCK_DIAG, IPPROTO_IP);
+
+ mutex_lock(&sock_diag_table_mutex);
+ if (inet_rcv_compat != NULL)
+ ret = inet_rcv_compat(skb, nlh);
+ else
+ ret = -EOPNOTSUPP;
+ mutex_unlock(&sock_diag_table_mutex);
+
+ return ret;
+ case SOCK_DIAG_BY_FAMILY:
+ return __sock_diag_rcv_msg(skb, nlh);
+ default:
+ return -EINVAL;
+ }
+}
+
+static DEFINE_MUTEX(sock_diag_mutex);
+
+static void sock_diag_rcv(struct sk_buff *skb)
+{
+ mutex_lock(&sock_diag_mutex);
+ netlink_rcv_skb(skb, &sock_diag_rcv_msg);
+ mutex_unlock(&sock_diag_mutex);
+}
+
+struct sock *sock_diag_nlsk;
+EXPORT_SYMBOL_GPL(sock_diag_nlsk);
+
+static int __init sock_diag_init(void)
+{
+ sock_diag_nlsk = netlink_kernel_create(&init_net, NETLINK_SOCK_DIAG, 0,
+ sock_diag_rcv, NULL, THIS_MODULE);
+ return sock_diag_nlsk == NULL ? -ENOMEM : 0;
+}
+
+static void __exit sock_diag_exit(void)
+{
+ netlink_kernel_release(sock_diag_nlsk);
+}
+
+module_init(sock_diag_init);
+module_exit(sock_diag_exit);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_SOCK_DIAG);