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netlink: add a start callback for starting a netlink dump

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The start callback allows the caller to set up a context for the
dump callbacks. Presumably, the context can then be destroyed in
the done callback.

Signed-off-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Herbert
2015-12-15 15:41:37 -08:00
committed by David S. Miller
parent 3502cad73c
commit fc9e50f5a5
4 changed files with 24 additions and 0 deletions
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4
net/netlink/af_netlink.c
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@@ -2915,6 +2915,7 @@ int __netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
cb = &nlk->cb;
memset(cb, 0, sizeof(*cb));
cb->start = control->start;
cb->dump = control->dump;
cb->done = control->done;
cb->nlh = nlh;
@@ -2927,6 +2928,9 @@ int __netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
mutex_unlock(nlk->cb_mutex);
if (cb->start)
cb->start(cb);
ret = netlink_dump(sk);
sock_put(sk);