[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, 133 insertions, 30 deletions

diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index f7142ba519ab..988eac58e9d1 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -109,19 +109,13 @@ int ip6_ra_control(struct sock *sk, int sel, void (*destructor)(struct sock *))
         return 0;
 }
 
-int ipv6_setsockopt(struct sock *sk, int level, int optname,
+static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
                     char __user *optval, int optlen)
 {
         struct ipv6_pinfo *np = inet6_sk(sk);
         int val, valbool;
         int retv = -ENOPROTOOPT;
 
-        if (level == SOL_IP && sk->sk_type != SOCK_RAW)
-                return udp_prot.setsockopt(sk, level, optname, optval, optlen);
-
-        if(level!=SOL_IPV6)
-                goto out;
-
         if (optval == NULL)
                 val=0;
         else if (get_user(val, (int __user *) optval))
@@ -613,17 +607,9 @@ done:
                 retv = xfrm_user_policy(sk, optname, optval, optlen);
                 break;
 
-#ifdef CONFIG_NETFILTER
-        default:
-                retv = nf_setsockopt(sk, PF_INET6, optname, optval, 
-                                            optlen);
-                break;
-#endif
-
         }
         release_sock(sk);
 
-out:
         return retv;
 
 e_inval:
@@ -631,6 +617,65 @@ e_inval:
         return -EINVAL;
 }
 
+int ipv6_setsockopt(struct sock *sk, int level, int optname,
+                    char __user *optval, int optlen)
+{
+        int err;
+
+        if (level == SOL_IP && sk->sk_type != SOCK_RAW)
+                return udp_prot.setsockopt(sk, level, optname, optval, optlen);
+
+        if (level != SOL_IPV6)
+                return -ENOPROTOOPT;
+
+        err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
+#ifdef CONFIG_NETFILTER
+        /* we need to exclude all possible ENOPROTOOPTs except default case */
+        if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
+                        optname != IPV6_XFRM_POLICY) {
+                lock_sock(sk);
+                err = nf_setsockopt(sk, PF_INET6, optname, optval,
+                                optlen);
+                release_sock(sk);
+        }
+#endif
+        return err;
+}
+
+
+#ifdef CONFIG_COMPAT
+int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
+                    char __user *optval, int optlen)
+{
+        int err;
+
+        if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
+                if (udp_prot.compat_setsockopt)
+                        return udp_prot.compat_setsockopt(sk, level,
+                                        optname, optval, optlen);
+                else
+                        return udp_prot.setsockopt(sk, level,
+                                        optname, optval, optlen);
+        }
+
+        if (level != SOL_IPV6)
+                return -ENOPROTOOPT;
+
+        err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
+#ifdef CONFIG_NETFILTER
+        /* we need to exclude all possible ENOPROTOOPTs except default case */
+        if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
+                        optname != IPV6_XFRM_POLICY) {
+                lock_sock(sk);
+                err = compat_nf_setsockopt(sk, PF_INET6, optname, optval,
+                                optlen);
+                release_sock(sk);
+        }
+#endif
+        return err;
+}
+#endif
+
 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_opt_hdr *hdr,
                                   char __user *optval, int len)
 {
@@ -642,17 +687,13 @@ static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_opt_hdr *hdr,
         return len;
 }
 
-int ipv6_getsockopt(struct sock *sk, int level, int optname,
+static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
                     char __user *optval, int __user *optlen)
 {
         struct ipv6_pinfo *np = inet6_sk(sk);
         int len;
         int val;
 
-        if (level == SOL_IP && sk->sk_type != SOCK_RAW)
-                return udp_prot.getsockopt(sk, level, optname, optval, optlen);
-        if(level!=SOL_IPV6)
-                return -ENOPROTOOPT;
         if (get_user(len, optlen))
                 return -EFAULT;
         switch (optname) {
@@ -842,17 +883,7 @@ int ipv6_getsockopt(struct sock *sk, int level, int optname,
                 break;
 
         default:
-#ifdef CONFIG_NETFILTER
-                lock_sock(sk);
-                val = nf_getsockopt(sk, PF_INET6, optname, optval, 
-                                    &len);
-                release_sock(sk);
-                if (val >= 0)
-                        val = put_user(len, optlen);
-                return val;
-#else
                 return -EINVAL;
-#endif
         }
         len = min_t(unsigned int, sizeof(int), len);
         if(put_user(len, optlen))
@@ -862,6 +893,78 @@ int ipv6_getsockopt(struct sock *sk, int level, int optname,
         return 0;
 }
 
+int ipv6_getsockopt(struct sock *sk, int level, int optname,
+                    char __user *optval, int __user *optlen)
+{
+        int err;
+
+        if (level == SOL_IP && sk->sk_type != SOCK_RAW)
+                return udp_prot.getsockopt(sk, level, optname, optval, optlen);
+
+        if(level != SOL_IPV6)
+                return -ENOPROTOOPT;
+
+        err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
+#ifdef CONFIG_NETFILTER
+        /* we need to exclude all possible EINVALs except default case */
+        if (err == -ENOPROTOOPT && optname != IPV6_ADDRFORM &&
+                        optname != MCAST_MSFILTER) {
+                int len;
+
+                if (get_user(len, optlen))
+                        return -EFAULT;
+
+                lock_sock(sk);
+                err = nf_getsockopt(sk, PF_INET6, optname, optval,
+                                &len);
+                release_sock(sk);
+                if (err >= 0)
+                        err = put_user(len, optlen);
+        }
+#endif
+        return err;
+}
+
+#ifdef CONFIG_COMPAT
+int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
+                    char __user *optval, int __user *optlen)
+{
+        int err;
+
+        if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
+                if (udp_prot.compat_getsockopt)
+                        return udp_prot.compat_getsockopt(sk, level,
+                                        optname, optval, optlen);
+                else
+                        return udp_prot.getsockopt(sk, level,
+                                        optname, optval, optlen);
+        }
+
+        if(level != SOL_IPV6)
+                return -ENOPROTOOPT;
+
+        err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
+#ifdef CONFIG_NETFILTER
+        /* we need to exclude all possible EINVALs except default case */
+        if (err == -ENOPROTOOPT && optname != IPV6_ADDRFORM &&
+                        optname != MCAST_MSFILTER) {
+                int len;
+
+                if (get_user(len, optlen))
+                        return -EFAULT;
+
+                lock_sock(sk);
+                err = compat_nf_getsockopt(sk, PF_INET6, optname, optval,
+                                &len);
+                release_sock(sk);
+                if (err >= 0)
+                        err = put_user(len, optlen);
+        }
+#endif
+        return err;
+}
+#endif
+
 void __init ipv6_packet_init(void)
 {
         dev_add_pack(&ipv6_packet_type);