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authorRichard Guy Briggs <rgb@redhat.com>2014-04-23 05:31:54 +0400
committerDavid S. Miller <davem@davemloft.net>2014-04-23 05:42:26 +0400
commit4f520900522fd596e336c07e9aafd5b7a9564235 (patch)
tree324137d33d9fe83adba3b0a96026f645fe7b12f1 /net/netlink/af_netlink.h
parentbfe4bc71c64a34813a7bde0ad4d28486679ac3fe (diff)
downloadlinux-4f520900522fd596e336c07e9aafd5b7a9564235.tar.xz
netlink: have netlink per-protocol bind function return an error code.
Have the netlink per-protocol optional bind function return an int error code rather than void to signal a failure. This will enable netlink protocols to perform extra checks including capabilities and permissions verifications when updating memberships in multicast groups. In netlink_bind() and netlink_setsockopt() the call to the per-protocol bind function was moved above the multicast group update to prevent any access to the multicast socket groups before checking with the per-protocol bind function. This will enable the per-protocol bind function to be used to check permissions which could be denied before making them available, and to avoid the messy job of undoing the addition should the per-protocol bind function fail. The netfilter subsystem seems to be the only one currently using the per-protocol bind function. Signed-off-by: Richard Guy Briggs <rgb@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/netlink/af_netlink.h')
-rw-r--r--net/netlink/af_netlink.h6
1 files changed, 4 insertions, 2 deletions
diff --git a/net/netlink/af_netlink.h b/net/netlink/af_netlink.h
index ed13a790b00e..0b59d441f5b6 100644
--- a/net/netlink/af_netlink.h
+++ b/net/netlink/af_netlink.h
@@ -38,7 +38,8 @@ struct netlink_sock {
struct mutex *cb_mutex;
struct mutex cb_def_mutex;
void (*netlink_rcv)(struct sk_buff *skb);
- void (*netlink_bind)(int group);
+ int (*netlink_bind)(int group);
+ void (*netlink_unbind)(int group);
struct module *module;
#ifdef CONFIG_NETLINK_MMAP
struct mutex pg_vec_lock;
@@ -74,7 +75,8 @@ struct netlink_table {
unsigned int groups;
struct mutex *cb_mutex;
struct module *module;
- void (*bind)(int group);
+ int (*bind)(int group);
+ void (*unbind)(int group);
bool (*compare)(struct net *net, struct sock *sock);
int registered;
};