From 910a7e905f36e51a17d6e8bb4ad6dcd5ac5f1d53 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Tue, 4 May 2010 17:36:46 -0700 Subject: netlink: Implment netlink_broadcast_filtered 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 Acked-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/netlink/af_netlink.c | 21 +++++++++++++++++++-- 1 file changed, 19 insertions(+), 2 deletions(-) (limited to 'net') diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c index 6464a1972a69..a2eb965207d3 100644 --- a/net/netlink/af_netlink.c +++ b/net/netlink/af_netlink.c @@ -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(struct sock *sk, 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, struct sk_buff *skb, u32 pid, 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, struct sk_buff *skb, u32 pid, } 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 { -- cgit v1.2.3