lib, ipcpd: piggyback ECDHE on flow allocation

The initial implementation for the ECDHE key exchange was doing the
key exchange after a flow was established. The public keys are now
sent allowg on the flow allocation messages, so that an encrypted
tunnel can be created within 1 RTT. The flow allocation steps had to
be extended to pass the opaque data ('piggybacking').

Signed-off-by: Dimitri Staessens <[email protected]>
Signed-off-by: Sander Vrijders <[email protected]>

1 files changed, 8 insertions, 4 deletions

diff --git a/include/ouroboros/ipcp-dev.h b/include/ouroboros/ipcp-dev.h
index 59e594fe..d60e0b45 100644
--- a/include/ouroboros/ipcp-dev.h
+++ b/include/ouroboros/ipcp-dev.h
@@ -30,10 +30,14 @@ int  ipcp_create_r(int result);
 
 int  ipcp_flow_req_arr(const uint8_t * dst,
                        size_t          len,
-                       qosspec_t       qs);
-
-int  ipcp_flow_alloc_reply(int fd,
-                           int response);
+                       qosspec_t       qs,
+                       const void *    data,
+                       size_t          dlen);
+
+int  ipcp_flow_alloc_reply(int          fd,
+                           int          response,
+                           const void * data,
+                           size_t       len);
 
 int  ipcp_flow_read(int                   fd,
                     struct shm_du_buff ** sdb);