Factor out one helper each for setting the native and compat
version of the MCAST_MSFILTER option.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
net/ipv4/ip_sockglue.c | 109 +++++++++++++++++++++--------------------
1 file changed, 56 insertions(+), 53 deletions(-)
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index b587dee006f882..73bb88fbe54661 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -806,6 +806,60 @@ static int compat_ip_set_mcast_msfilter(struct sock *sk, void __user *optval,
}
#endif
+static int ip_mcast_join_leave(struct sock *sk, int optname,
+ void __user *optval, int optlen)
+{
+ struct ip_mreqn mreq = { };
+ struct sockaddr_in *psin;
+ struct group_req greq;
+
+ if (optlen < sizeof(struct group_req))
+ return -EINVAL;
+ if (copy_from_user(&greq, optval, sizeof(greq)))
+ return -EFAULT;
+
+ psin = (struct sockaddr_in *)&greq.gr_group;
+ if (psin->sin_family != AF_INET)
+ return -EINVAL;
+ mreq.imr_multiaddr = psin->sin_addr;
+ mreq.imr_ifindex = greq.gr_interface;
+ if (optname == MCAST_JOIN_GROUP)
+ return ip_mc_join_group(sk, &mreq);
+ return ip_mc_leave_group(sk, &mreq);
+}
+
+#ifdef CONFIG_COMPAT
+static int compat_ip_mcast_join_leave(struct sock *sk, int optname,
+ void __user *optval, int optlen)
+{
+ struct compat_group_req greq;
+ struct ip_mreqn mreq = { };
+ struct sockaddr_in *psin;
+ int err;
+
+ if (optlen < sizeof(struct compat_group_req))
+ return -EINVAL;
+ if (copy_from_user(&greq, optval, sizeof(greq)))
+ return -EFAULT;
+
+ psin = (struct sockaddr_in *)&greq.gr_group;
+ if (psin->sin_family != AF_INET)
+ return -EINVAL;
+ mreq.imr_multiaddr = psin->sin_addr;
+ mreq.imr_ifindex = greq.gr_interface;
+
+ rtnl_lock();
+ lock_sock(sk);
+ if (optname == MCAST_JOIN_GROUP)
+ err = ip_mc_join_group(sk, &mreq);
+ else
+ err = ip_mc_leave_group(sk, &mreq);
+ release_sock(sk);
+ rtnl_unlock();
+ return err;
+}
+#endif
+
static int do_ip_setsockopt(struct sock *sk, int level,
int optname, char __user *optval, unsigned int optlen)
{
@@ -1211,29 +1265,8 @@ static int do_ip_setsockopt(struct sock *sk, int level,
}
case MCAST_JOIN_GROUP:
case MCAST_LEAVE_GROUP:
- {
- struct group_req greq;
- struct sockaddr_in *psin;
- struct ip_mreqn mreq;
-
- if (optlen < sizeof(struct group_req))
- goto e_inval;
- err = -EFAULT;
- if (copy_from_user(&greq, optval, sizeof(greq)))
- break;
- psin = (struct sockaddr_in *)&greq.gr_group;
- if (psin->sin_family != AF_INET)
- goto e_inval;
- memset(&mreq, 0, sizeof(mreq));
- mreq.imr_multiaddr = psin->sin_addr;
- mreq.imr_ifindex = greq.gr_interface;
-
- if (optname == MCAST_JOIN_GROUP)
- err = ip_mc_join_group(sk, &mreq);
- else
- err = ip_mc_leave_group(sk, &mreq);
+ err = ip_mcast_join_leave(sk, optname, optval, optlen);
break;
- }
case MCAST_JOIN_SOURCE_GROUP:
case MCAST_LEAVE_SOURCE_GROUP:
case MCAST_BLOCK_SOURCE:
@@ -1389,37 +1422,7 @@ int compat_ip_setsockopt(struct sock *sk, int level, int optname,
switch (optname) {
case MCAST_JOIN_GROUP:
case MCAST_LEAVE_GROUP:
- {
- struct compat_group_req __user *gr32 = (void __user *)optval;
- struct group_req greq;
- struct sockaddr_in *psin = (struct sockaddr_in *)&greq.gr_group;
- struct ip_mreqn mreq;
-
- if (optlen < sizeof(struct compat_group_req))
- return -EINVAL;
-
- if (get_user(greq.gr_interface, &gr32->gr_interface) ||
- copy_from_user(&greq.gr_group, &gr32->gr_group,
- sizeof(greq.gr_group)))
- return -EFAULT;
-
- if (psin->sin_family != AF_INET)
- return -EINVAL;
-
- memset(&mreq, 0, sizeof(mreq));
- mreq.imr_multiaddr = psin->sin_addr;
- mreq.imr_ifindex = greq.gr_interface;
-
- rtnl_lock();
- lock_sock(sk);
- if (optname == MCAST_JOIN_GROUP)
- err = ip_mc_join_group(sk, &mreq);
- else
- err = ip_mc_leave_group(sk, &mreq);
- release_sock(sk);
- rtnl_unlock();
- return err;
- }
+ return compat_ip_mcast_join_leave(sk, optname, optval, optlen);
case MCAST_JOIN_SOURCE_GROUP:
case MCAST_LEAVE_SOURCE_GROUP:
case MCAST_BLOCK_SOURCE:
--
2.27.0
