[NET]: {get|set}sockopt compatibility layer

This patch extends {get|set}sockopt compatibility layer in order to
move protocol specific parts to their place and avoid huge universal
net/compat.c file in the future.

Signed-off-by: Dmitry Mishin <dim@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 65 insertions, 12 deletions

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 00aa80e93243..31b0123a9699 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -1687,18 +1687,14 @@ int tcp_disconnect(struct sock *sk, int flags)
 /*
  *      Socket option code for TCP.
  */
-int tcp_setsockopt(struct sock *sk, int level, int optname, char __user *optval,
-                   int optlen)
+static int do_tcp_setsockopt(struct sock *sk, int level,
+                int optname, char __user *optval, int optlen)
 {
         struct tcp_sock *tp = tcp_sk(sk);
         struct inet_connection_sock *icsk = inet_csk(sk);
         int val;
         int err = 0;
 
-        if (level != SOL_TCP)
-                return icsk->icsk_af_ops->setsockopt(sk, level, optname,
-                                                     optval, optlen);
-
         /* This is a string value all the others are int's */
         if (optname == TCP_CONGESTION) {
                 char name[TCP_CA_NAME_MAX];
@@ -1871,6 +1867,35 @@ int tcp_setsockopt(struct sock *sk, int level, int optname, char __user *optval,
         return err;
 }
 
+int tcp_setsockopt(struct sock *sk, int level, int optname, char __user *optval,
+                   int optlen)
+{
+        struct inet_connection_sock *icsk = inet_csk(sk);
+
+        if (level != SOL_TCP)
+                return icsk->icsk_af_ops->setsockopt(sk, level, optname,
+                                                     optval, optlen);
+        return do_tcp_setsockopt(sk, level, optname, optval, optlen);
+}
+
+#ifdef CONFIG_COMPAT
+int compat_tcp_setsockopt(struct sock *sk, int level,
+                int optname, char __user *optval, int optlen)
+{
+        struct inet_connection_sock *icsk = inet_csk(sk);
+
+        if (level != SOL_TCP) {
+                if (icsk->icsk_af_ops->compat_setsockopt)
+                        return icsk->icsk_af_ops->compat_setsockopt(sk,
+                                level, optname, optval, optlen);
+                else
+                        return icsk->icsk_af_ops->setsockopt(sk,
+                                level, optname, optval, optlen);
+        }
+        return do_tcp_setsockopt(sk, level, optname, optval, optlen);
+}
+#endif
+
 /* Return information about state of tcp endpoint in API format. */
 void tcp_get_info(struct sock *sk, struct tcp_info *info)
 {
@@ -1931,17 +1956,13 @@ void tcp_get_info(struct sock *sk, struct tcp_info *info)
 
 EXPORT_SYMBOL_GPL(tcp_get_info);
 
-int tcp_getsockopt(struct sock *sk, int level, int optname, char __user *optval,
-                   int __user *optlen)
+static int do_tcp_getsockopt(struct sock *sk, int level,
+                int optname, char __user *optval, int __user *optlen)
 {
         struct inet_connection_sock *icsk = inet_csk(sk);
         struct tcp_sock *tp = tcp_sk(sk);
         int val, len;
 
-        if (level != SOL_TCP)
-                return icsk->icsk_af_ops->getsockopt(sk, level, optname,
-                                                     optval, optlen);
-
         if (get_user(len, optlen))
                 return -EFAULT;
 
@@ -2025,6 +2046,34 @@ int tcp_getsockopt(struct sock *sk, int level, int optname, char __user *optval,
         return 0;
 }
 
+int tcp_getsockopt(struct sock *sk, int level, int optname, char __user *optval,
+                   int __user *optlen)
+{
+        struct inet_connection_sock *icsk = inet_csk(sk);
+
+        if (level != SOL_TCP)
+                return icsk->icsk_af_ops->getsockopt(sk, level, optname,
+                                                     optval, optlen);
+        return do_tcp_getsockopt(sk, level, optname, optval, optlen);
+}
+
+#ifdef CONFIG_COMPAT
+int compat_tcp_getsockopt(struct sock *sk, int level,
+                int optname, char __user *optval, int __user *optlen)
+{
+        struct inet_connection_sock *icsk = inet_csk(sk);
+
+        if (level != SOL_TCP) {
+                if (icsk->icsk_af_ops->compat_getsockopt)
+                        return icsk->icsk_af_ops->compat_getsockopt(sk,
+                                level, optname, optval, optlen);
+                else
+                        return icsk->icsk_af_ops->getsockopt(sk,
+                                level, optname, optval, optlen);
+        }
+        return do_tcp_getsockopt(sk, level, optname, optval, optlen);
+}
+#endif
 
 extern void __skb_cb_too_small_for_tcp(int, int);
 extern struct tcp_congestion_ops tcp_reno;
@@ -2142,3 +2191,7 @@ EXPORT_SYMBOL(tcp_sendpage);
 EXPORT_SYMBOL(tcp_setsockopt);
 EXPORT_SYMBOL(tcp_shutdown);
 EXPORT_SYMBOL(tcp_statistics);
+#ifdef CONFIG_COMPAT
+EXPORT_SYMBOL(compat_tcp_setsockopt);
+EXPORT_SYMBOL(compat_tcp_getsockopt);
+#endif