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// SPDX-License-Identifier: GPL-2.0
#define _GNU_SOURCE
#include <arpa/inet.h>
#include <error.h>
#include <errno.h>
#include <limits.h>
#include <linux/errqueue.h>
#include <linux/if_packet.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <netinet/ip.h>
#include <netinet/ip6.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <poll.h>
#include <sched.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
static int cfg_port = 8000;
static bool cfg_tcp;
static bool cfg_verify;
static bool interrupted;
static unsigned long packets, bytes;
static void sigint_handler(int signum)
{
if (signum == SIGINT)
interrupted = true;
}
static unsigned long gettimeofday_ms(void)
{
struct timeval tv;
gettimeofday(&tv, NULL);
return (tv.tv_sec * 1000) + (tv.tv_usec / 1000);
}
static void do_poll(int fd)
{
struct pollfd pfd;
int ret;
pfd.events = POLLIN;
pfd.revents = 0;
pfd.fd = fd;
do {
ret = poll(&pfd, 1, 10);
if (ret == -1)
error(1, errno, "poll");
if (ret == 0)
continue;
if (pfd.revents != POLLIN)
error(1, errno, "poll: 0x%x expected 0x%x\n",
pfd.revents, POLLIN);
} while (!ret && !interrupted);
}
static int do_socket(bool do_tcp)
{
struct sockaddr_in6 addr = {0};
int fd, val;
fd = socket(PF_INET6, cfg_tcp ? SOCK_STREAM : SOCK_DGRAM, 0);
if (fd == -1)
error(1, errno, "socket");
val = 1 << 21;
if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &val, sizeof(val)))
error(1, errno, "setsockopt rcvbuf");
val = 1;
if (setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &val, sizeof(val)))
error(1, errno, "setsockopt reuseport");
addr.sin6_family = PF_INET6;
addr.sin6_port = htons(cfg_port);
addr.sin6_addr = in6addr_any;
if (bind(fd, (void *) &addr, sizeof(addr)))
error(1, errno, "bind");
if (do_tcp) {
int accept_fd = fd;
if (listen(accept_fd, 1))
error(1, errno, "listen");
do_poll(accept_fd);
fd = accept(accept_fd, NULL, NULL);
if (fd == -1)
error(1, errno, "accept");
if (close(accept_fd))
error(1, errno, "close accept fd");
}
return fd;
}
/* Flush all outstanding bytes for the tcp receive queue */
static void do_flush_tcp(int fd)
{
int ret;
while (true) {
/* MSG_TRUNC flushes up to len bytes */
ret = recv(fd, NULL, 1 << 21, MSG_TRUNC | MSG_DONTWAIT);
if (ret == -1 && errno == EAGAIN)
return;
if (ret == -1)
error(1, errno, "flush");
if (ret == 0) {
/* client detached */
exit(0);
}
packets++;
bytes += ret;
}
}
static char sanitized_char(char val)
{
return (val >= 'a' && val <= 'z') ? val : '.';
}
static void do_verify_udp(const char *data, int len)
{
char cur = data[0];
int i;
/* verify contents */
if (cur < 'a' || cur > 'z')
error(1, 0, "data initial byte out of range");
for (i = 1; i < len; i++) {
if (cur == 'z')
cur = 'a';
else
cur++;
if (data[i] != cur)
error(1, 0, "data[%d]: len %d, %c(%hhu) != %c(%hhu)\n",
i, len,
sanitized_char(data[i]), data[i],
sanitized_char(cur), cur);
}
}
/* Flush all outstanding datagrams. Verify first few bytes of each. */
static void do_flush_udp(int fd)
{
static char rbuf[ETH_DATA_LEN];
int ret, len, budget = 256;
len = cfg_verify ? sizeof(rbuf) : 0;
while (budget--) {
/* MSG_TRUNC will make return value full datagram length */
ret = recv(fd, rbuf, len, MSG_TRUNC | MSG_DONTWAIT);
if (ret == -1 && errno == EAGAIN)
return;
if (ret == -1)
error(1, errno, "recv");
if (len) {
if (ret == 0)
error(1, errno, "recv: 0 byte datagram\n");
do_verify_udp(rbuf, ret);
}
packets++;
bytes += ret;
}
}
static void usage(const char *filepath)
{
error(1, 0, "Usage: %s [-tv] [-p port]", filepath);
}
static void parse_opts(int argc, char **argv)
{
int c;
while ((c = getopt(argc, argv, "ptv")) != -1) {
switch (c) {
case 'p':
cfg_port = htons(strtoul(optarg, NULL, 0));
break;
case 't':
cfg_tcp = true;
break;
case 'v':
cfg_verify = true;
break;
}
}
if (optind != argc)
usage(argv[0]);
if (cfg_tcp && cfg_verify)
error(1, 0, "TODO: implement verify mode for tcp");
}
static void do_recv(void)
{
unsigned long tnow, treport;
int fd;
fd = do_socket(cfg_tcp);
treport = gettimeofday_ms() + 1000;
do {
do_poll(fd);
if (cfg_tcp)
do_flush_tcp(fd);
else
do_flush_udp(fd);
tnow = gettimeofday_ms();
if (tnow > treport) {
if (packets)
fprintf(stderr,
"%s rx: %6lu MB/s %8lu calls/s\n",
cfg_tcp ? "tcp" : "udp",
bytes >> 20, packets);
bytes = packets = 0;
treport = tnow + 1000;
}
} while (!interrupted);
if (close(fd))
error(1, errno, "close");
}
int main(int argc, char **argv)
{
parse_opts(argc, argv);
signal(SIGINT, sigint_handler);
do_recv();
return 0;
}
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