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Add simple burst loss capability #77

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Add simple burst loss capability #77

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33 changes: 23 additions & 10 deletions src/drop.c
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Original file line number Diff line number Diff line change
Expand Up @@ -5,11 +5,13 @@
#include "common.h"
#define NAME "drop"

static Ihandle *inboundCheckbox, *outboundCheckbox, *chanceInput;
static Ihandle *inboundCheckbox, *outboundCheckbox, *chanceInput, *burstLossInput;

static volatile short dropEnabled = 0,
dropInbound = 1, dropOutbound = 1,
chance = 1000; // [0-10000]
chance = 1000, // [0-10000]
consecutiveDropCount = 0,
bulkLossChance = 0;


static Ihandle* dropSetupUI() {
Expand All @@ -18,13 +20,19 @@ static Ihandle* dropSetupUI() {
outboundCheckbox = IupToggle("Outbound", NULL),
IupLabel("Chance(%):"),
chanceInput = IupText(NULL),
IupLabel("Burst(%):"),
burstLossInput = IupText(NULL),
NULL
);

IupSetAttribute(chanceInput, "VISIBLECOLUMNS", "4");
IupSetAttribute(chanceInput, "VALUE", "10.0");
IupSetCallback(chanceInput, "VALUECHANGED_CB", uiSyncChance);
IupSetAttribute(chanceInput, SYNCED_VALUE, (char*)&chance);
IupSetAttribute(burstLossInput, "VISIBLECOLUMNS", "6");
IupSetAttribute(burstLossInput, "VALUE", "0.0");
IupSetCallback(burstLossInput, "VALUECHANGED_CB", uiSyncChance);
IupSetAttribute(burstLossInput, SYNCED_VALUE, (char*)&bulkLossChance);
IupSetCallback(inboundCheckbox, "ACTION", (Icallback)uiSyncToggle);
IupSetAttribute(inboundCheckbox, SYNCED_VALUE, (char*)&dropInbound);
IupSetCallback(outboundCheckbox, "ACTION", (Icallback)uiSyncToggle);
Expand Down Expand Up @@ -58,15 +66,20 @@ static short dropProcess(PacketNode *head, PacketNode* tail) {
while (head->next != tail) {
PacketNode *pac = head->next;
// chance in range of [0, 10000]
if (checkDirection(pac->addr.Direction, dropInbound, dropOutbound)
&& calcChance(chance)) {
LOG("dropped with chance %.1f%%, direction %s",
chance/100.0, BOUND_TEXT(pac->addr.Direction));
freeNode(popNode(pac));
++dropped;
} else {
head = head->next;
if (checkDirection(pac->addr.Direction, dropInbound, dropOutbound)) {
if ((consecutiveDropCount > 0 && calcChance(bulkLossChance)) || calcChance(chance)) {
LOG("dropped with chance %.1f%%, direction %s",
chance / 100.0, BOUND_TEXT(pac->addr.Direction));
freeNode(popNode(pac));
++dropped;
++consecutiveDropCount;
continue;
}
else {
consecutiveDropCount = 0;
}
}
head = head->next;
}

return dropped > 0;
Expand Down