ipcpd: Filter fqueue events in packet handlers

The eth, udp and local IPCPs were not filtering out the event types
from the flow, causing some reads when there are no packets in the
queue. The types are now also organized as flags so they can be
filtered more quickly if needed.

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

4 files changed, 15 insertions, 5 deletions

diff --git a/include/ouroboros/fqueue.h b/include/ouroboros/fqueue.h
index 793ff250..797e3af6 100644
--- a/include/ouroboros/fqueue.h
+++ b/include/ouroboros/fqueue.h
@@ -29,11 +29,11 @@
 #include <time.h>
 
 enum fqtype {
-        FLOW_PKT = 0,
-        FLOW_DOWN,
-        FLOW_UP,
-        FLOW_ALLOC,
-        FLOW_DEALLOC
+        FLOW_PKT     = (1 << 0),
+        FLOW_DOWN    = (1 << 1),
+        FLOW_UP      = (1 << 2),
+        FLOW_ALLOC   = (1 << 3),
+        FLOW_DEALLOC = (1 << 4)
 };
 
 struct flow_set;
diff --git a/src/ipcpd/eth/eth.c b/src/ipcpd/eth/eth.c
index 9cc11848..daeb9be2 100644
--- a/src/ipcpd/eth/eth.c
+++ b/src/ipcpd/eth/eth.c
@@ -1035,6 +1035,9 @@ static void * eth_ipcp_packet_writer(void * o)
         while (true) {
                 fevent(eth_data.np1_flows, fq, NULL);
                 while ((fd = fqueue_next(fq)) >= 0) {
+                        if (fqueue_type(fq) != FLOW_PKT)
+                                continue
+;
                         if (ipcp_flow_read(fd, &sdb)) {
                                 log_dbg("Bad read from fd %d.", fd);
                                 continue;
diff --git a/src/ipcpd/local/main.c b/src/ipcpd/local/main.c
index 28a7c32b..009a3fde 100644
--- a/src/ipcpd/local/main.c
+++ b/src/ipcpd/local/main.c
@@ -110,6 +110,9 @@ static void * ipcp_local_packet_loop(void * o)
                 fevent(local_data.flows, local_data.fq, NULL);
 
                 while ((fd = fqueue_next(local_data.fq)) >= 0) {
+                        if (fqueue_type(local_data.fq) != FLOW_PKT)
+                                continue;
+
                         idx = local_flow_read(fd);
                         if (idx < 0)
                                 continue;
diff --git a/src/ipcpd/udp/main.c b/src/ipcpd/udp/main.c
index a444e956..1f0bebf0 100644
--- a/src/ipcpd/udp/main.c
+++ b/src/ipcpd/udp/main.c
@@ -520,6 +520,10 @@ static void * ipcp_udp_packet_writer(void * o)
                         struct shm_du_buff * sdb;
                         uint8_t *            buf;
                         uint16_t             len;
+
+                        if (fqueue_type(fq) != FLOW_PKT)
+                                continue;
+
                         if (ipcp_flow_read(fd, &sdb)) {
                                 log_dbg("Bad read from fd %d.", fd);
                                 continue;