// 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>
#ifndef UDP_GRO
#define UDP_GRO 104
#endif
static int cfg_port = 8000;
static bool cfg_tcp;
static bool cfg_verify;
static bool cfg_read_all;
static bool cfg_gro_segment;
static int cfg_family = PF_INET6;
static int cfg_alen = sizeof(struct sockaddr_in6);
static int cfg_expected_pkt_nr;
static int cfg_expected_pkt_len;
static int cfg_expected_gso_size;
static int cfg_connect_timeout_ms;
static int cfg_rcv_timeout_ms;
static struct sockaddr_storage cfg_bind_addr;
static bool interrupted;
static unsigned long packets, bytes;
static void sigint_handler(int signum)
{
if (signum == SIGINT)
interrupted = true;
}
static void setup_sockaddr(int domain, const char *str_addr, void *sockaddr)
{
struct sockaddr_in6 *addr6 = (void *) sockaddr;
struct sockaddr_in *addr4 = (void *) sockaddr;
switch (domain) {
case PF_INET:
addr4->sin_family = AF_INET;
addr4->sin_port = htons(cfg_port);
if (inet_pton(AF_INET, str_addr, &(addr4->sin_addr)) != 1)
error(1, 0, "ipv4 parse error: %s", str_addr);
break;
case PF_INET6:
addr6->sin6_family = AF_INET6;
addr6->sin6_port = htons(cfg_port);
if (inet_pton(AF_INET6, str_addr, &(addr6->sin6_addr)) != 1)
error(1, 0, "ipv6 parse error: %s", str_addr);
break;
default:
error(1, 0, "illegal domain");
}
}
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, int timeout_ms)
{
struct pollfd pfd;
int ret;
pfd.events = POLLIN;
pfd.revents = 0;
pfd.fd = fd;
do {
ret = poll(&pfd, 1, 10);
if (interrupted)
break;
if (ret == -1)
error(1, errno, "poll");
if (ret == 0) {
if (!timeout_ms)
continue;
timeout_ms -= 10;
if (timeout_ms <= 0) {
interrupted = true;
break;
}
/* no events and more time to wait, do poll again */
continue;
}
if (pfd.revents != POLLIN)
error(1, errno, "poll: 0x%x expected 0x%x\n",
pfd.revents, POLLIN);
} while (!ret);
}
static int do_socket(bool do_tcp)
{
int fd, val;
fd = socket(cfg_family, 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");
if (bind(fd, (void *)&cfg_bind_addr, cfg_alen))
error(1, errno, "bind");
if (do_tcp) {
int accept_fd = fd;
if (listen(accept_fd, 1))
error(1, errno, "listen");
do_poll(accept_fd, cfg_connect_timeout_ms);
if (interrupted)
exit(0);
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);
}
}
static int recv_msg(int fd, char *buf, int len, int *gso_size)
{
char control[CMSG_SPACE(sizeof(int))] = {0};
struct msghdr msg = {0};
struct iovec iov = {0};
struct cmsghdr *cmsg;
int ret;
iov.iov_base = buf;
iov.iov_len = len;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_control = control;
msg.msg_controllen = sizeof(control);
*gso_size = -1;
ret = recvmsg(fd, &msg, MSG_TRUNC | MSG_DONTWAIT);
if (ret != -1) {
for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL;
cmsg = CMSG_NXTHDR(&msg, cmsg)) {
if (cmsg->cmsg_level == SOL_UDP
&& cmsg->cmsg_type == UDP_GRO) {
*gso_size = *(int *)CMSG_DATA(cmsg);
break;
}
}
}
return ret;
}
/* Flush all outstanding datagrams. Verify first few bytes of each. */
static void do_flush_udp(int fd)
{
static char rbuf[ETH_MAX_MTU];
int ret, len, gso_size = 0, budget = 256;
len = cfg_read_all ? sizeof(rbuf) : 0;
while (budget--) {
/* MSG_TRUNC will make return value full datagram length */
if (!cfg_expected_gso_size)
ret = recv(fd, rbuf, len, MSG_TRUNC | MSG_DONTWAIT);
else
ret = recv_msg(fd, rbuf, len, &gso_size);
if (ret == -1 && errno == EAGAIN)
break;
if (ret == -1)
error(1, errno, "recv");
if (cfg_expected_pkt_len && ret != cfg_expected_pkt_len)
error(1, 0, "recv: bad packet len, got %d,"
" expected %d\n", ret, cfg_expected_pkt_len);
if (len && cfg_verify) {
if (ret == 0)
error(1, errno, "recv: 0 byte datagram\n");
do_verify_udp(rbuf, ret);
}
if (cfg_expected_gso_size && cfg_expected_gso_size != gso_size)
error(1, 0, "recv: bad gso size, got %d, expected %d "
"(-1 == no gso cmsg))\n", gso_size,
cfg_expected_gso_size);
packets++;
bytes += ret;
if (cfg_expected_pkt_nr && packets >= cfg_expected_pkt_nr)
break;
}
}
static void usage(const char *filepath)
{
error(1, 0, "Usage: %s [-C connect_timeout] [-Grtv] [-b addr] [-p port]"
" [-l pktlen] [-n packetnr] [-R rcv_timeout] [-S gsosize]",
filepath);
}
static void parse_opts(int argc, char **argv)
{
const char *bind_addr = NULL;
int c;
while ((c = getopt(argc, argv, "4b:C:Gl:n:p:rR:S:tv")) != -1) {
switch (c) {
case '4':
cfg_family = PF_INET;
cfg_alen = sizeof(struct sockaddr_in);
break;
case 'b':
bind_addr = optarg;
break;
case 'C':
cfg_connect_timeout_ms = strtoul(optarg, NULL, 0);
break;
case 'G':
cfg_gro_segment = true;
break;
case 'l':
cfg_expected_pkt_len = strtoul(optarg, NULL, 0);
break;
case 'n':
cfg_expected_pkt_nr = strtoul(optarg, NULL, 0);
break;
case 'p':
cfg_port = strtoul(optarg, NULL, 0);
break;
case 'r':
cfg_read_all = true;
break;
case 'R':
cfg_rcv_timeout_ms = strtoul(optarg, NULL, 0);
break;
case 'S':
cfg_expected_gso_size = strtol(optarg, NULL, 0);
break;
case 't':
cfg_tcp = true;
break;
case 'v':
cfg_verify = true;
cfg_read_all = true;
break;
default:
exit(1);
}
}
if (!bind_addr)
bind_addr = cfg_family == PF_INET6 ? "::" : "0.0.0.0";
setup_sockaddr(cfg_family, bind_addr, &cfg_bind_addr);
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)
{
int timeout_ms = cfg_tcp ? cfg_rcv_timeout_ms : cfg_connect_timeout_ms;
unsigned long tnow, treport;
int fd;
fd = do_socket(cfg_tcp);
if (cfg_gro_segment && !cfg_tcp) {
int val = 1;
if (setsockopt(fd, IPPROTO_UDP, UDP_GRO, &val, sizeof(val)))
error(1, errno, "setsockopt UDP_GRO");
}
treport = gettimeofday_ms() + 1000;
do {
do_poll(fd, timeout_ms);
if (cfg_tcp)
do_flush_tcp(fd);
else
do_flush_udp(fd);
tnow = gettimeofday_ms();
if (!cfg_expected_pkt_nr && 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;
}
timeout_ms = cfg_rcv_timeout_ms;
} while (!interrupted);
if (cfg_expected_pkt_nr && (packets != cfg_expected_pkt_nr))
error(1, 0, "wrong packet number! got %ld, expected %d\n",
packets, cfg_expected_pkt_nr);
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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