Commit ffce4196 authored by Roopa Prabhu's avatar Roopa Prabhu Committed by David S. Miller
Browse files

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: default avatarRoopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 19e42e45
...@@ -69,6 +69,8 @@ int lwtunnel_fill_encap(struct sk_buff *skb, ...@@ -69,6 +69,8 @@ int lwtunnel_fill_encap(struct sk_buff *skb,
int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate); int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate);
struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len); struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len);
int lwtunnel_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b); int lwtunnel_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b);
int lwtunnel_output(struct sock *sk, struct sk_buff *skb);
int lwtunnel_output6(struct sock *sk, struct sk_buff *skb);
#else #else
...@@ -127,6 +129,16 @@ static inline int lwtunnel_cmp_encap(struct lwtunnel_state *a, ...@@ -127,6 +129,16 @@ static inline int lwtunnel_cmp_encap(struct lwtunnel_state *a,
return 0; return 0;
} }
static inline int lwtunnel_output(struct sock *sk, struct sk_buff *skb)
{
return -EOPNOTSUPP;
}
static inline int lwtunnel_output6(struct sock *sk, struct sk_buff *skb)
{
return -EOPNOTSUPP;
}
#endif #endif
#endif /* __NET_LWTUNNEL_H */ #endif /* __NET_LWTUNNEL_H */
...@@ -25,6 +25,7 @@ ...@@ -25,6 +25,7 @@
#include <net/lwtunnel.h> #include <net/lwtunnel.h>
#include <net/rtnetlink.h> #include <net/rtnetlink.h>
#include <net/ip6_fib.h>
struct lwtunnel_state *lwtunnel_state_alloc(int encap_len) struct lwtunnel_state *lwtunnel_state_alloc(int encap_len)
{ {
...@@ -177,3 +178,58 @@ int lwtunnel_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b) ...@@ -177,3 +178,58 @@ int lwtunnel_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b)
return ret; return ret;
} }
EXPORT_SYMBOL(lwtunnel_cmp_encap); 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);
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