[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, 123 insertions, 19 deletions

diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index b5c4f61518e8..49ff1cd4e1c9 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -399,14 +399,12 @@ out:
  *      an IP socket.
  */
 
-int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, int optlen)
+static int do_ip_setsockopt(struct sock *sk, int level,
+                int optname, char __user *optval, int optlen)
 {
         struct inet_sock *inet = inet_sk(sk);
         int val=0,err;
 
-        if (level != SOL_IP)
-                return -ENOPROTOOPT;
-
         if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) | 
                             (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) | 
                             (1<<IP_RETOPTS) | (1<<IP_TOS) | 
@@ -875,12 +873,7 @@ mc_msf_out:
                         break;
 
                 default:
-#ifdef CONFIG_NETFILTER
-                        err = nf_setsockopt(sk, PF_INET, optname, optval, 
-                                            optlen);
-#else
                         err = -ENOPROTOOPT;
-#endif
                         break;
         }
         release_sock(sk);
@@ -891,12 +884,66 @@ e_inval:
         return -EINVAL;
 }
 
+int ip_setsockopt(struct sock *sk, int level,
+                int optname, char __user *optval, int optlen)
+{
+        int err;
+
+        if (level != SOL_IP)
+                return -ENOPROTOOPT;
+
+        err = do_ip_setsockopt(sk, level, optname, optval, optlen);
+#ifdef CONFIG_NETFILTER
+        /* we need to exclude all possible ENOPROTOOPTs except default case */
+        if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
+                optname != IP_IPSEC_POLICY && optname != IP_XFRM_POLICY
+#ifdef CONFIG_IP_MROUTE
+                && (optname < MRT_BASE || optname > (MRT_BASE + 10))
+#endif
+           ) {
+                lock_sock(sk);
+                err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
+                release_sock(sk);
+        }
+#endif
+        return err;
+}
+
+#ifdef CONFIG_COMPAT
+int compat_ip_setsockopt(struct sock *sk, int level,
+                int optname, char __user *optval, int optlen)
+{
+        int err;
+
+        if (level != SOL_IP)
+                return -ENOPROTOOPT;
+
+        err = do_ip_setsockopt(sk, level, optname, optval, optlen);
+#ifdef CONFIG_NETFILTER
+        /* we need to exclude all possible ENOPROTOOPTs except default case */
+        if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
+                optname != IP_IPSEC_POLICY && optname != IP_XFRM_POLICY
+#ifdef CONFIG_IP_MROUTE
+                && (optname < MRT_BASE || optname > (MRT_BASE + 10))
+#endif
+           ) {
+                lock_sock(sk);
+                err = compat_nf_setsockopt(sk, PF_INET,
+                                optname, optval, optlen);
+                release_sock(sk);
+        }
+#endif
+        return err;
+}
+#endif
+
 /*
  *      Get the options. Note for future reference. The GET of IP options gets the
  *      _received_ ones. The set sets the _sent_ ones.
  */
 
-int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen)
+static int do_ip_getsockopt(struct sock *sk, int level, int optname,
+                char __user *optval, int __user *optlen)
 {
         struct inet_sock *inet = inet_sk(sk);
         int val;
@@ -1080,17 +1127,8 @@ int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval,
                         val = inet->freebind; 
                         break; 
                 default:
-#ifdef CONFIG_NETFILTER
-                        val = nf_getsockopt(sk, PF_INET, optname, optval, 
-                                            &len);
-                        release_sock(sk);
-                        if (val >= 0)
-                                val = put_user(len, optlen);
-                        return val;
-#else
                         release_sock(sk);
                         return -ENOPROTOOPT;
-#endif
         }
         release_sock(sk);
         
@@ -1111,7 +1149,73 @@ int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval,
         return 0;
 }
 
+int ip_getsockopt(struct sock *sk, int level,
+                int optname, char __user *optval, int __user *optlen)
+{
+        int err;
+
+        err = do_ip_getsockopt(sk, level, optname, optval, optlen);
+#ifdef CONFIG_NETFILTER
+        /* we need to exclude all possible ENOPROTOOPTs except default case */
+        if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS
+#ifdef CONFIG_IP_MROUTE
+                && (optname < MRT_BASE || optname > MRT_BASE+10)
+#endif
+           ) {
+                int len;
+
+                if(get_user(len,optlen))
+                        return -EFAULT;
+
+                lock_sock(sk);
+                err = nf_getsockopt(sk, PF_INET, optname, optval,
+                                &len);
+                release_sock(sk);
+                if (err >= 0)
+                        err = put_user(len, optlen);
+                return err;
+        }
+#endif
+        return err;
+}
+
+#ifdef CONFIG_COMPAT
+int compat_ip_getsockopt(struct sock *sk, int level,
+                int optname, char __user *optval, int __user *optlen)
+{
+        int err;
+
+        err = do_ip_getsockopt(sk, level, optname, optval, optlen);
+#ifdef CONFIG_NETFILTER
+        /* we need to exclude all possible ENOPROTOOPTs except default case */
+        if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS
+#ifdef CONFIG_IP_MROUTE
+                && (optname < MRT_BASE || optname > MRT_BASE+10)
+#endif
+           ) {
+                int len;
+
+                if(get_user(len,optlen))
+                        return -EFAULT;
+
+                lock_sock(sk);
+                err = compat_nf_getsockopt(sk, PF_INET,
+                                optname, optval, &len);
+                release_sock(sk);
+                if (err >= 0)
+                        err = put_user(len, optlen);
+                return err;
+        }
+#endif
+        return err;
+}
+#endif
+
 EXPORT_SYMBOL(ip_cmsg_recv);
 
 EXPORT_SYMBOL(ip_getsockopt);
 EXPORT_SYMBOL(ip_setsockopt);
+#ifdef CONFIG_COMPAT
+EXPORT_SYMBOL(compat_ip_getsockopt);
+EXPORT_SYMBOL(compat_ip_setsockopt);
+#endif