MS make available a set of IP helper functions (https://learn.microsoft.com/en-us/windows/desktop/api/_iphlp/), that allows management and monitoring of the whole IP stack (native IP protocol and derived).
You can use monitoring functions specialized for IP, TCP or UDP:
GetIpStatistics()
GetUdpStatistics()
GetTcpStatistics()
MS supply a functional sample in https://learn.microsoft.com/en-us/windows/desktop/api/iphlpapi/nf-iphlpapi-getipstatistics, that I report:
#ifndef UNICODE
#define UNICODE
#endif
#include <winsock2.h>
#include <ws2tcpip.h>
#include <iphlpapi.h>
#include <stdio.h>
#pragma comment(lib, "iphlpapi.lib")
#define MALLOC(x) HeapAlloc(GetProcessHeap(), 0, (x))
#define FREE(x) HeapFree(GetProcessHeap(), 0, (x))
/* Note: could also use malloc() and free() */
int main()
{
DWORD dwRetval;
MIB_IPSTATS *pStats;
pStats = (MIB_IPSTATS *) MALLOC(sizeof (MIB_IPSTATS));
if (pStats == NULL) {
wprintf(L"Unable to allocate memory for MIB_IPSTATS\n");
exit(1);
}
dwRetval = GetIpStatistics(pStats);
if (dwRetval != NO_ERROR) {
wprintf(L"GetIpStatistics call failed with %d\n", dwRetval);
exit(1);
} else {
wprintf(L"IP forwarding: \t\t" );
switch (pStats->dwForwarding) {
case MIB_IP_FORWARDING:
wprintf(L"Enabled\n");
break;
case MIB_IP_NOT_FORWARDING:
wprintf(L"Disabled\n");
break;
default:
wprintf(L"unknown value = %d\n", pStats->dwForwarding);
break;
}
wprintf(L"Default initial TTL: \t\t\t\t\t%u\n", pStats->dwDefaultTTL);
wprintf(L"Number of received datagrams: \t\t\t\t%u\n", pStats->dwInReceives);
wprintf(L"Number of received datagrams with header errors: \t%u\n", pStats->dwInHdrErrors);
wprintf(L"Number of received datagrams with address errors: \t%u\n", pStats->dwInAddrErrors);
wprintf(L"Number of datagrams forwarded: \t\t\t\t%ld\n", pStats->dwForwDatagrams);
wprintf(L"Number of received datagrams with an unknown protocol: \t%u\n", pStats->dwInUnknownProtos);
wprintf(L"Number of received datagrams discarded: \t\t%u\n", pStats->dwInDiscards);
wprintf(L"Number of received datagrams delivered: \t\t%u\n", pStats->dwInDelivers);
wprintf(L"Number of outgoing datagrams requested to transmit: \t%u\n", pStats->dwOutRequests);
wprintf(L"Number of outgoing datagrams discarded for routing: \t%u\n", pStats->dwRoutingDiscards);
wprintf(L"Number of outgoing datagrams discarded: \t\t%u\n", pStats->dwOutDiscards);
wprintf(L"Number of outgoing datagrams with no route to destination discarded: %u\n", pStats->dwOutNoRoutes);
wprintf(L"Fragment reassembly timeout: \t\t\t\t%u\n", pStats->dwReasmTimeout);
wprintf(L"Number of datagrams that required reassembly: \t\t%u\n", pStats->dwReasmReqds);
wprintf(L"Number of datagrams successfully reassembled: \t\t%u\n", pStats->dwReasmOks);
wprintf(L"Number of datagrams that could not be reassembled: \t%u\n", pStats->dwReasmFails);
wprintf(L"Number of datagrams fragmented successfully: \t\t%u\n", pStats->dwFragOks);
wprintf(L"Number of datagrams not fragmented and discarded: \t%u\n", pStats->dwFragFails);
wprintf(L"Number of fragments created: \t\t\t\t%u\n", pStats->dwFragCreates);
wprintf(L"Number of interfaces: \t\t\t\t\t%u\n", pStats->dwNumIf);
wprintf(L"Number of IP addresses: \t\t\t\t%u\n", pStats->dwNumAddr);
wprintf(L"Number of routes: \t\t\t\t\t%u\n", pStats->dwNumRoutes);
}
// Free memory allocated for the MIB_IPSTATS structure
if (pStats)
FREE(pStats);
return 0;
}
This code can be reused for each of the functions relative to IP, TCP and UDP by replacing the helper function with the appropriate one.
Exists also extended version for those functions that allow to restrict monitoring to IPV4 or IPV6.
Detailed information are available on the MS page of IP helper.