@@ -188,6 +188,10 @@ extern int netlink_has_listeners(struct
extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 pid, int nonblock);
extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 pid,
__u32 group, gfp_t allocation);
+extern int netlink_broadcast_filtered(struct sock *ssk, struct sk_buff *skb,
+ __u32 pid, __u32 group, gfp_t allocation,
+ int (*filter)(struct sock *dsk, struct sk_buff *skb, void *data),
+ void *filter_data);
extern int netlink_set_err(struct sock *ssk, __u32 pid, __u32 group, int code);
extern int netlink_register_notifier(struct notifier_block *nb);
extern int netlink_unregister_notifier(struct notifier_block *nb);
@@ -978,6 +978,8 @@ struct netlink_broadcast_data {
int delivered;
gfp_t allocation;
struct sk_buff *skb, *skb2;
+ int (*tx_filter)(struct sock *dsk, struct sk_buff *skb, void *data);
+ void *tx_data;
};
static inline int do_one_broadcast(struct sock *sk,
@@ -1020,6 +1022,9 @@ static inline int do_one_broadcast(struc
p->failure = 1;
if (nlk->flags & NETLINK_BROADCAST_SEND_ERROR)
p->delivery_failure = 1;
+ } else if (p->tx_filter && p->tx_filter(sk, p->skb2, p->tx_data)) {
+ kfree_skb(p->skb2);
+ p->skb2 = NULL;
} else if (sk_filter(sk, p->skb2)) {
kfree_skb(p->skb2);
p->skb2 = NULL;
@@ -1038,8 +1043,10 @@ out:
return 0;
}
-int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, u32 pid,
- u32 group, gfp_t allocation)
+int netlink_broadcast_filtered(struct sock *ssk, struct sk_buff *skb, u32 pid,
+ u32 group, gfp_t allocation,
+ int (*filter)(struct sock *dsk, struct sk_buff *skb, void *data),
+ void *filter_data)
{
struct net *net = sock_net(ssk);
struct netlink_broadcast_data info;
@@ -1059,6 +1066,8 @@ int netlink_broadcast(struct sock *ssk,
info.allocation = allocation;
info.skb = skb;
info.skb2 = NULL;
+ info.tx_filter = filter;
+ info.tx_data = filter_data;
/* While we sleep in clone, do not allow to change socket list */
@@ -1083,6 +1092,14 @@ int netlink_broadcast(struct sock *ssk,
}
return -ESRCH;
}
+EXPORT_SYMBOL(netlink_broadcast_filtered);
+
+int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, u32 pid,
+ u32 group, gfp_t allocation)
+{
+ return netlink_broadcast_filtered(ssk, skb, pid, group, allocation,
+ NULL, NULL);
+}
EXPORT_SYMBOL(netlink_broadcast);
struct netlink_set_err_data {
This is a note to let you know that I've just added the patch titled Subject: netlink: Implment netlink_broadcast_filtered to my gregkh-2.6 tree. Its filename is netlink-implment-netlink_broadcast_filtered.patch This tree can be found at http://www.kernel.org/pub/linux/kernel/people/gregkh/gregkh-2.6/patches/ From ebiederm@xmission.com Thu May 20 10:43:10 2010 From: "Eric W. Biederman" <ebiederm@xmission.com> Date: Tue, 4 May 2010 17:36:46 -0700 Subject: netlink: Implment netlink_broadcast_filtered To: Greg Kroah-Hartman <gregkh@suse.de> Cc: Kay Sievers <kay.sievers@vrfy.org>, linux-kernel@vger.kernel.org, Tejun Heo <tj@kernel.org>, Cornelia Huck <cornelia.huck@de.ibm.com>, Eric Dumazet <eric.dumazet@gmail.com>, Benjamin LaHaise <bcrl@lhnet.ca>, Serge Hallyn <serue@us.ibm.com>, <netdev@vger.kernel.org>, David Miller <davem@davemloft.net>, "Eric W. Biederman" <ebiederm@xmission.com> Message-ID: <1273019809-16472-3-git-send-email-ebiederm@xmission.com> From: Eric W. Biederman <ebiederm@xmission.com> When netlink sockets are used to convey data that is in a namespace we need a way to select a subset of the listening sockets to deliver the packet to. For the network namespace we have been doing this by only transmitting packets in the correct network namespace. For data belonging to other namespaces netlink_bradcast_filtered provides a mechanism that allows us to examine the destination socket and to decide if we should transmit the specified packet to it. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> --- include/linux/netlink.h | 4 ++++ net/netlink/af_netlink.c | 21 +++++++++++++++++++-- 2 files changed, 23 insertions(+), 2 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html