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Subject[PATCH 09/19] ipv[46]: do compat setsockopt for MCAST_{JOIN,LEAVE}_GROUP directly
Date
From: Al Viro <viro@zeniv.linux.org.uk>

direct parallel to the way these two are handled in the native
->setsockopt() instances - the helpers that do the real work
are already separated and can be reused as-is in this case.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
net/ipv4/ip_sockglue.c | 31 +++++++++++++++++++++++++++++++
net/ipv6/ipv6_sockglue.c | 28 ++++++++++++++++++++++++++++
2 files changed, 59 insertions(+)

diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index dc1f5276be4e..937f39906419 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -1282,6 +1282,37 @@ 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;
+ }
case MCAST_JOIN_SOURCE_GROUP:
case MCAST_LEAVE_SOURCE_GROUP:
case MCAST_BLOCK_SOURCE:
diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index 220087bfd17c..b386a2b3668c 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -976,6 +976,34 @@ int compat_ipv6_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_in6 *psin6 = (struct sockaddr_in6 *)&greq.gr_group;
+
+ 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 (greq.gr_group.ss_family != AF_INET6)
+ return -EADDRNOTAVAIL;
+
+ rtnl_lock();
+ lock_sock(sk);
+ if (optname == MCAST_JOIN_GROUP)
+ err = ipv6_sock_mc_join(sk, greq.gr_interface,
+ &psin6->sin6_addr);
+ else
+ err = ipv6_sock_mc_drop(sk, greq.gr_interface,
+ &psin6->sin6_addr);
+ release_sock(sk);
+ rtnl_unlock();
+ return err;
+ }
case MCAST_JOIN_SOURCE_GROUP:
case MCAST_LEAVE_SOURCE_GROUP:
case MCAST_BLOCK_SOURCE:
--
2.11.0
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