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Diffstat (limited to 'include/net/lwtunnel.h')
-rw-r--r--include/net/lwtunnel.h44
1 files changed, 44 insertions, 0 deletions
diff --git a/include/net/lwtunnel.h b/include/net/lwtunnel.h
index e9f116e29c22..ea3f80f58fd6 100644
--- a/include/net/lwtunnel.h
+++ b/include/net/lwtunnel.h
@@ -13,6 +13,13 @@
/* lw tunnel state flags */
#define LWTUNNEL_STATE_OUTPUT_REDIRECT BIT(0)
#define LWTUNNEL_STATE_INPUT_REDIRECT BIT(1)
+#define LWTUNNEL_STATE_XMIT_REDIRECT BIT(2)
+
+enum {
+ LWTUNNEL_XMIT_DONE,
+ LWTUNNEL_XMIT_CONTINUE,
+};
+
struct lwtunnel_state {
__u16 type;
@@ -21,6 +28,7 @@ struct lwtunnel_state {
int (*orig_output)(struct net *net, struct sock *sk, struct sk_buff *skb);
int (*orig_input)(struct sk_buff *);
int len;
+ __u16 headroom;
__u8 data[0];
};
@@ -34,6 +42,7 @@ struct lwtunnel_encap_ops {
struct lwtunnel_state *lwtstate);
int (*get_encap_size)(struct lwtunnel_state *lwtstate);
int (*cmp_encap)(struct lwtunnel_state *a, struct lwtunnel_state *b);
+ int (*xmit)(struct sk_buff *skb);
};
#ifdef CONFIG_LWTUNNEL
@@ -75,6 +84,24 @@ static inline bool lwtunnel_input_redirect(struct lwtunnel_state *lwtstate)
return false;
}
+
+static inline bool lwtunnel_xmit_redirect(struct lwtunnel_state *lwtstate)
+{
+ if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_XMIT_REDIRECT))
+ return true;
+
+ return false;
+}
+
+static inline unsigned int lwtunnel_headroom(struct lwtunnel_state *lwtstate,
+ unsigned int mtu)
+{
+ if (lwtunnel_xmit_redirect(lwtstate) && lwtstate->headroom < mtu)
+ return lwtstate->headroom;
+
+ return 0;
+}
+
int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op,
unsigned int num);
int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op,
@@ -90,6 +117,7 @@ struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len);
int lwtunnel_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b);
int lwtunnel_output(struct net *net, struct sock *sk, struct sk_buff *skb);
int lwtunnel_input(struct sk_buff *skb);
+int lwtunnel_xmit(struct sk_buff *skb);
#else
@@ -117,6 +145,17 @@ static inline bool lwtunnel_input_redirect(struct lwtunnel_state *lwtstate)
return false;
}
+static inline bool lwtunnel_xmit_redirect(struct lwtunnel_state *lwtstate)
+{
+ return false;
+}
+
+static inline unsigned int lwtunnel_headroom(struct lwtunnel_state *lwtstate,
+ unsigned int mtu)
+{
+ return 0;
+}
+
static inline int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op,
unsigned int num)
{
@@ -170,6 +209,11 @@ static inline int lwtunnel_input(struct sk_buff *skb)
return -EOPNOTSUPP;
}
+static inline int lwtunnel_xmit(struct sk_buff *skb)
+{
+ return -EOPNOTSUPP;
+}
+
#endif /* CONFIG_LWTUNNEL */
#define MODULE_ALIAS_RTNL_LWT(encap_type) MODULE_ALIAS("rtnl-lwt-" __stringify(encap_type))