lwtunnel: support dst output redirect function
This patch introduces lwtunnel_output function to call corresponding
lwtunnels output function to xmit the packet.
It adds two variants lwtunnel_output and lwtunnel_output6 for ipv4 and
ipv6 respectively today. But this is subject to change when lwtstate will
reside in dst or dst_metadata (as per upstream discussions).
Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/lwtunnel.c b/net/core/lwtunnel.c
index d7ae3a2..bb58826 100644
--- a/net/core/lwtunnel.c
+++ b/net/core/lwtunnel.c
@@ -25,6 +25,7 @@
#include <net/lwtunnel.h>
#include <net/rtnetlink.h>
+#include <net/ip6_fib.h>
struct lwtunnel_state *lwtunnel_state_alloc(int encap_len)
{
@@ -177,3 +178,58 @@
return ret;
}
EXPORT_SYMBOL(lwtunnel_cmp_encap);
+
+int __lwtunnel_output(struct sock *sk, struct sk_buff *skb,
+ struct lwtunnel_state *lwtstate)
+{
+ const struct lwtunnel_encap_ops *ops;
+ int ret = -EINVAL;
+
+ if (!lwtstate)
+ goto drop;
+
+ if (lwtstate->type == LWTUNNEL_ENCAP_NONE ||
+ lwtstate->type > LWTUNNEL_ENCAP_MAX)
+ return 0;
+
+ ret = -EOPNOTSUPP;
+ rcu_read_lock();
+ ops = rcu_dereference(lwtun_encaps[lwtstate->type]);
+ if (likely(ops && ops->output))
+ ret = ops->output(sk, skb);
+ rcu_read_unlock();
+
+ if (ret == -EOPNOTSUPP)
+ goto drop;
+
+ return ret;
+
+drop:
+ kfree(skb);
+
+ return ret;
+}
+
+int lwtunnel_output6(struct sock *sk, struct sk_buff *skb)
+{
+ struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
+ struct lwtunnel_state *lwtstate = NULL;
+
+ if (rt)
+ lwtstate = rt->rt6i_lwtstate;
+
+ return __lwtunnel_output(sk, skb, lwtstate);
+}
+EXPORT_SYMBOL(lwtunnel_output6);
+
+int lwtunnel_output(struct sock *sk, struct sk_buff *skb)
+{
+ struct rtable *rt = (struct rtable *)skb_dst(skb);
+ struct lwtunnel_state *lwtstate = NULL;
+
+ if (rt)
+ lwtstate = rt->rt_lwtstate;
+
+ return __lwtunnel_output(sk, skb, lwtstate);
+}
+EXPORT_SYMBOL(lwtunnel_output);