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

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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.
This commit is contained in:
Etienne Dechamps 2015-01-01 16:04:08 +00:00
parent df6f678957
commit 5bdc1f2b82
1 changed files with 6 additions and 6 deletions
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12
src/net_packet.c
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@ -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)