lib: Refactor reading packet from rbuff

Reading packets from the rbuff and checking their validity (non-zero
size, pass crc check, pass decryption) is now extracted into a
function.

Also adds a function to get the length of an sdu_du_buff instead of
subtracting the tail and head pointers.

Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>
Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/ipcpd/udp/main.c b/src/ipcpd/udp/main.c
index 7def856b..d3104163 100644
--- a/src/ipcpd/udp/main.c
+++ b/src/ipcpd/udp/main.c
@@ -541,7 +541,7 @@ static void * ipcp_udp_packet_writer(void * o)
                                 continue;
                         }
 
-                        len = shm_du_buff_tail(sdb) - shm_du_buff_head(sdb);
+                        len = shm_du_buff_len(sdb);
                         if (len > IPCP_UDP_MAX_PACKET_SIZE) {
                                 log_dbg("Packet length exceeds MTU.");
                                 ipcp_sdb_release(sdb);