Use -1 to identify the post-initial MTU discovery state.

This is a minor cosmetic nit to emphasise the distinction between the
initial MTU discovery phase, and the post-initial phase (i.e. maxmtu
checking).

Furthermore, this is an improvement with regard to the DRY (Don't
Repeat Yourself) principle, as the maximum mtuprobes value is only
written once.

diff --git a/src/net_packet.c b/src/net_packet.c
index f51aec3..3078e54 100644 (file)
--- a/src/net_packet.c
+++ b/src/net_packet.c
@@ -66,7 +66,7 @@ int udp_discovery_timeout = 30;
 #define MAX_SEQNO 1073741824
 
 static void try_fix_mtu(node_t *n) {
-       if(n->mtuprobes > 30)
+       if(n->mtuprobes < 0)
                return;
 
        if(n->mtuprobes == 30 || n->minmtu >= n->maxmtu) {
@@ -76,7 +76,7 @@ static void try_fix_mtu(node_t *n) {
                        n->maxmtu = n->minmtu;
                n->mtu = n->minmtu;
                logger(DEBUG_TRAFFIC, LOG_INFO, "Fixing MTU of %s (%s) to %d after %d probes", n->name, n->hostname, n->mtu, n->mtuprobes);
-               n->mtuprobes = 31;
+               n->mtuprobes = -1;
        }
 }
 
@@ -904,14 +904,14 @@ static void try_mtu(node_t *n) {
        }
 
        /* mtuprobes == 0..29: initial discovery, send bursts with 1 second interval, mtuprobes++
-          mtuprobes ==    30: fix MTU, and go to 31
-          mtuprobes ==    31: send one >maxmtu probe every pingtimeout */
+          mtuprobes ==    30: fix MTU, and go to -1
+          mtuprobes ==    -1: send one >maxmtu probe every pingtimeout */
 
        struct timeval now;
        gettimeofday(&now, NULL);
        struct timeval elapsed;
        timersub(&now, &n->probe_sent_time, &elapsed);
-       if(n->mtuprobes < 31) {
+       if(n->mtuprobes >= 0) {
                if(n->mtuprobes != 0 && elapsed.tv_sec < 1)
                        return;
        } else {
@@ -922,7 +922,7 @@ static void try_mtu(node_t *n) {
        try_fix_mtu(n);
 
        int timeout;
-       if(n->mtuprobes == 31) {
+       if(n->mtuprobes < 0) {
                /* After the initial discovery, we only send one >maxmtu probe
                   to detect PMTU increases. */
                if(n->maxmtu + 8 < MTU)