diff options
| author | Stephen Hemminger <shemminger@vyatta.com> | 2008-03-21 15:46:12 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-03-21 15:46:12 -0700 |
| commit | b1153f29ee07dc1a788964409255a4b4fae50b98 (patch) | |
| tree | 3e9c09804e805da77d225a8508c28e064a310c45 /net | |
| parent | 6f8b13bcb3369a5df2e63acc422bed6098f5b8c4 (diff) | |
| download | lwn-b1153f29ee07dc1a788964409255a4b4fae50b98.tar.gz lwn-b1153f29ee07dc1a788964409255a4b4fae50b98.zip | |
netlink: make socket filters work on netlink
Make socket filters work for netlink unicast and notifications.
This is useful for applications like Zebra that get overrun with
messages that are then ignored.
Note: netlink messages are in host byte order, but packet filter
state machine operations are done as network byte order.
Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/netlink/af_netlink.c | 27 |
1 files changed, 23 insertions, 4 deletions
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c index 524e826bb976..86bd8660a8f2 100644 --- a/net/netlink/af_netlink.c +++ b/net/netlink/af_netlink.c @@ -886,6 +886,13 @@ retry: if (netlink_is_kernel(sk)) return netlink_unicast_kernel(sk, skb); + if (sk_filter(sk, skb)) { + int err = skb->len; + kfree_skb(skb); + sock_put(sk); + return err; + } + err = netlink_attachskb(sk, skb, nonblock, &timeo, ssk); if (err == 1) goto retry; @@ -980,6 +987,9 @@ static inline int do_one_broadcast(struct sock *sk, netlink_overrun(sk); /* Clone failed. Notify ALL listeners. */ p->failure = 1; + } else if (sk_filter(sk, p->skb2)) { + kfree_skb(p->skb2); + p->skb2 = NULL; } else if ((val = netlink_broadcast_deliver(sk, p->skb2)) < 0) { netlink_overrun(sk); } else { @@ -1533,8 +1543,13 @@ static int netlink_dump(struct sock *sk) if (len > 0) { mutex_unlock(nlk->cb_mutex); - skb_queue_tail(&sk->sk_receive_queue, skb); - sk->sk_data_ready(sk, len); + + if (sk_filter(sk, skb)) + kfree_skb(skb); + else { + skb_queue_tail(&sk->sk_receive_queue, skb); + sk->sk_data_ready(sk, skb->len); + } return 0; } @@ -1544,8 +1559,12 @@ static int netlink_dump(struct sock *sk) memcpy(nlmsg_data(nlh), &len, sizeof(len)); - skb_queue_tail(&sk->sk_receive_queue, skb); - sk->sk_data_ready(sk, skb->len); + if (sk_filter(sk, skb)) + kfree_skb(skb); + else { + skb_queue_tail(&sk->sk_receive_queue, skb); + sk->sk_data_ready(sk, skb->len); + } if (cb->done) cb->done(cb); |