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OpenCloudOS-Kernel/Documentation/networking/timestamping/txtimestamp.c

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/*
* Copyright 2014 Google Inc.
* Author: willemb@google.com (Willem de Bruijn)
*
* Test software tx timestamping, including
*
* - SCHED, SND and ACK timestamps
* - RAW, UDP and TCP
* - IPv4 and IPv6
* - various packet sizes (to test GSO and TSO)
*
* Consult the command line arguments for help on running
* the various testcases.
*
* This test requires a dummy TCP server.
* A simple `nc6 [-u] -l -p $DESTPORT` will do
*
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. * See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <arpa/inet.h>
#include <asm/types.h>
#include <error.h>
#include <errno.h>
#include <linux/errqueue.h>
#include <linux/if_ether.h>
#include <linux/net_tstamp.h>
#include <netdb.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/udp.h>
#include <netinet/tcp.h>
#include <netpacket/packet.h>
#include <poll.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/select.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>
/* ugly hack to work around netinet/in.h and linux/ipv6.h conflicts */
#ifndef in6_pktinfo
struct in6_pktinfo {
struct in6_addr ipi6_addr;
int ipi6_ifindex;
};
#endif
/* command line parameters */
static int cfg_proto = SOCK_STREAM;
static int cfg_ipproto = IPPROTO_TCP;
static int cfg_num_pkts = 4;
static int do_ipv4 = 1;
static int do_ipv6 = 1;
static int cfg_payload_len = 10;
static bool cfg_show_payload;
static bool cfg_do_pktinfo;
static uint16_t dest_port = 9000;
static struct sockaddr_in daddr;
static struct sockaddr_in6 daddr6;
static struct timespec ts_prev;
static void __print_timestamp(const char *name, struct timespec *cur,
uint32_t key, int payload_len)
{
if (!(cur->tv_sec | cur->tv_nsec))
return;
fprintf(stderr, " %s: %lu s %lu us (seq=%u, len=%u)",
name, cur->tv_sec, cur->tv_nsec / 1000,
key, payload_len);
if ((ts_prev.tv_sec | ts_prev.tv_nsec)) {
int64_t cur_ms, prev_ms;
cur_ms = (long) cur->tv_sec * 1000 * 1000;
cur_ms += cur->tv_nsec / 1000;
prev_ms = (long) ts_prev.tv_sec * 1000 * 1000;
prev_ms += ts_prev.tv_nsec / 1000;
fprintf(stderr, " (%+ld us)", cur_ms - prev_ms);
}
ts_prev = *cur;
fprintf(stderr, "\n");
}
static void print_timestamp_usr(void)
{
struct timespec ts;
struct timeval tv; /* avoid dependency on -lrt */
gettimeofday(&tv, NULL);
ts.tv_sec = tv.tv_sec;
ts.tv_nsec = tv.tv_usec * 1000;
__print_timestamp(" USR", &ts, 0, 0);
}
static void print_timestamp(struct scm_timestamping *tss, int tstype,
int tskey, int payload_len)
{
const char *tsname;
switch (tstype) {
case SCM_TSTAMP_SCHED:
tsname = " ENQ";
break;
case SCM_TSTAMP_SND:
tsname = " SND";
break;
case SCM_TSTAMP_ACK:
tsname = " ACK";
break;
default:
error(1, 0, "unknown timestamp type: %u",
tstype);
}
__print_timestamp(tsname, &tss->ts[0], tskey, payload_len);
}
/* TODO: convert to check_and_print payload once API is stable */
static void print_payload(char *data, int len)
{
int i;
if (len > 70)
len = 70;
fprintf(stderr, "payload: ");
for (i = 0; i < len; i++)
fprintf(stderr, "%02hhx ", data[i]);
fprintf(stderr, "\n");
}
static void print_pktinfo(int family, int ifindex, void *saddr, void *daddr)
{
char sa[INET6_ADDRSTRLEN], da[INET6_ADDRSTRLEN];
fprintf(stderr, " pktinfo: ifindex=%u src=%s dst=%s\n",
ifindex,
saddr ? inet_ntop(family, saddr, sa, sizeof(sa)) : "unknown",
daddr ? inet_ntop(family, daddr, da, sizeof(da)) : "unknown");
}
static void __poll(int fd)
{
struct pollfd pollfd;
int ret;
memset(&pollfd, 0, sizeof(pollfd));
pollfd.fd = fd;
ret = poll(&pollfd, 1, 100);
if (ret != 1)
error(1, errno, "poll");
}
static void __recv_errmsg_cmsg(struct msghdr *msg, int payload_len)
{
struct sock_extended_err *serr = NULL;
struct scm_timestamping *tss = NULL;
struct cmsghdr *cm;
for (cm = CMSG_FIRSTHDR(msg);
cm && cm->cmsg_len;
cm = CMSG_NXTHDR(msg, cm)) {
if (cm->cmsg_level == SOL_SOCKET &&
cm->cmsg_type == SCM_TIMESTAMPING) {
tss = (void *) CMSG_DATA(cm);
} else if ((cm->cmsg_level == SOL_IP &&
cm->cmsg_type == IP_RECVERR) ||
(cm->cmsg_level == SOL_IPV6 &&
cm->cmsg_type == IPV6_RECVERR)) {
serr = (void *) CMSG_DATA(cm);
if (serr->ee_errno != ENOMSG ||
serr->ee_origin != SO_EE_ORIGIN_TIMESTAMPING) {
fprintf(stderr, "unknown ip error %d %d\n",
serr->ee_errno,
serr->ee_origin);
serr = NULL;
}
} else if (cm->cmsg_level == SOL_IP &&
cm->cmsg_type == IP_PKTINFO) {
struct in_pktinfo *info = (void *) CMSG_DATA(cm);
print_pktinfo(AF_INET, info->ipi_ifindex,
&info->ipi_spec_dst, &info->ipi_addr);
} else if (cm->cmsg_level == SOL_IPV6 &&
cm->cmsg_type == IPV6_PKTINFO) {
struct in6_pktinfo *info6 = (void *) CMSG_DATA(cm);
print_pktinfo(AF_INET6, info6->ipi6_ifindex,
NULL, &info6->ipi6_addr);
} else
fprintf(stderr, "unknown cmsg %d,%d\n",
cm->cmsg_level, cm->cmsg_type);
}
if (serr && tss)
print_timestamp(tss, serr->ee_info, serr->ee_data, payload_len);
}
static int recv_errmsg(int fd)
{
static char ctrl[1024 /* overprovision*/];
static struct msghdr msg;
struct iovec entry;
static char *data;
int ret = 0;
data = malloc(cfg_payload_len);
if (!data)
error(1, 0, "malloc");
memset(&msg, 0, sizeof(msg));
memset(&entry, 0, sizeof(entry));
memset(ctrl, 0, sizeof(ctrl));
entry.iov_base = data;
entry.iov_len = cfg_payload_len;
msg.msg_iov = &entry;
msg.msg_iovlen = 1;
msg.msg_name = NULL;
msg.msg_namelen = 0;
msg.msg_control = ctrl;
msg.msg_controllen = sizeof(ctrl);
ret = recvmsg(fd, &msg, MSG_ERRQUEUE);
if (ret == -1 && errno != EAGAIN)
error(1, errno, "recvmsg");
if (ret > 0) {
__recv_errmsg_cmsg(&msg, ret);
if (cfg_show_payload)
print_payload(data, cfg_payload_len);
}
free(data);
return ret == -1;
}
static void do_test(int family, unsigned int opt)
{
char *buf;
int fd, i, val = 1, total_len;
if (family == AF_INET6 && cfg_proto != SOCK_STREAM) {
/* due to lack of checksum generation code */
fprintf(stderr, "test: skipping datagram over IPv6\n");
return;
}
total_len = cfg_payload_len;
if (cfg_proto == SOCK_RAW) {
total_len += sizeof(struct udphdr);
if (cfg_ipproto == IPPROTO_RAW)
total_len += sizeof(struct iphdr);
}
buf = malloc(total_len);
if (!buf)
error(1, 0, "malloc");
fd = socket(family, cfg_proto, cfg_ipproto);
if (fd < 0)
error(1, errno, "socket");
if (cfg_proto == SOCK_STREAM) {
if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY,
(char*) &val, sizeof(val)))
error(1, 0, "setsockopt no nagle");
if (family == PF_INET) {
if (connect(fd, (void *) &daddr, sizeof(daddr)))
error(1, errno, "connect ipv4");
} else {
if (connect(fd, (void *) &daddr6, sizeof(daddr6)))
error(1, errno, "connect ipv6");
}
}
if (cfg_do_pktinfo) {
if (family == AF_INET6) {
if (setsockopt(fd, SOL_IPV6, IPV6_RECVPKTINFO,
&val, sizeof(val)))
error(1, errno, "setsockopt pktinfo ipv6");
} else {
if (setsockopt(fd, SOL_IP, IP_PKTINFO,
&val, sizeof(val)))
error(1, errno, "setsockopt pktinfo ipv4");
}
}
opt |= SOF_TIMESTAMPING_SOFTWARE |
SOF_TIMESTAMPING_OPT_CMSG |
SOF_TIMESTAMPING_OPT_ID;
if (setsockopt(fd, SOL_SOCKET, SO_TIMESTAMPING,
(char *) &opt, sizeof(opt)))
error(1, 0, "setsockopt timestamping");
for (i = 0; i < cfg_num_pkts; i++) {
memset(&ts_prev, 0, sizeof(ts_prev));
memset(buf, 'a' + i, total_len);
if (cfg_proto == SOCK_RAW) {
struct udphdr *udph;
int off = 0;
if (cfg_ipproto == IPPROTO_RAW) {
struct iphdr *iph = (void *) buf;
memset(iph, 0, sizeof(*iph));
iph->ihl = 5;
iph->version = 4;
iph->ttl = 2;
iph->daddr = daddr.sin_addr.s_addr;
iph->protocol = IPPROTO_UDP;
/* kernel writes saddr, csum, len */
off = sizeof(*iph);
}
udph = (void *) buf + off;
udph->source = ntohs(9000); /* random spoof */
udph->dest = ntohs(dest_port);
udph->len = ntohs(sizeof(*udph) + cfg_payload_len);
udph->check = 0; /* not allowed for IPv6 */
}
print_timestamp_usr();
if (cfg_proto != SOCK_STREAM) {
if (family == PF_INET)
val = sendto(fd, buf, total_len, 0, (void *) &daddr, sizeof(daddr));
else
val = sendto(fd, buf, total_len, 0, (void *) &daddr6, sizeof(daddr6));
} else {
val = send(fd, buf, cfg_payload_len, 0);
}
if (val != total_len)
error(1, errno, "send");
/* wait for all errors to be queued, else ACKs arrive OOO */
usleep(50 * 1000);
__poll(fd);
while (!recv_errmsg(fd)) {}
}
if (close(fd))
error(1, errno, "close");
free(buf);
usleep(400 * 1000);
}
static void __attribute__((noreturn)) usage(const char *filepath)
{
fprintf(stderr, "\nUsage: %s [options] hostname\n"
"\nwhere options are:\n"
" -4: only IPv4\n"
" -6: only IPv6\n"
" -h: show this message\n"
" -I: request PKTINFO\n"
" -l N: send N bytes at a time\n"
" -r: use raw\n"
" -R: use raw (IP_HDRINCL)\n"
" -p N: connect to port N\n"
" -u: use udp\n"
" -x: show payload (up to 70 bytes)\n",
filepath);
exit(1);
}
static void parse_opt(int argc, char **argv)
{
int proto_count = 0;
char c;
while ((c = getopt(argc, argv, "46hIl:p:rRux")) != -1) {
switch (c) {
case '4':
do_ipv6 = 0;
break;
case '6':
do_ipv4 = 0;
break;
case 'I':
cfg_do_pktinfo = true;
break;
case 'r':
proto_count++;
cfg_proto = SOCK_RAW;
cfg_ipproto = IPPROTO_UDP;
break;
case 'R':
proto_count++;
cfg_proto = SOCK_RAW;
cfg_ipproto = IPPROTO_RAW;
break;
case 'u':
proto_count++;
cfg_proto = SOCK_DGRAM;
cfg_ipproto = IPPROTO_UDP;
break;
case 'l':
cfg_payload_len = strtoul(optarg, NULL, 10);
break;
case 'p':
dest_port = strtoul(optarg, NULL, 10);
break;
case 'x':
cfg_show_payload = true;
break;
case 'h':
default:
usage(argv[0]);
}
}
if (!cfg_payload_len)
error(1, 0, "payload may not be nonzero");
if (cfg_proto != SOCK_STREAM && cfg_payload_len > 1472)
error(1, 0, "udp packet might exceed expected MTU");
if (!do_ipv4 && !do_ipv6)
error(1, 0, "pass -4 or -6, not both");
if (proto_count > 1)
error(1, 0, "pass -r, -R or -u, not multiple");
if (optind != argc - 1)
error(1, 0, "missing required hostname argument");
}
static void resolve_hostname(const char *hostname)
{
struct addrinfo *addrs, *cur;
int have_ipv4 = 0, have_ipv6 = 0;
if (getaddrinfo(hostname, NULL, NULL, &addrs))
error(1, errno, "getaddrinfo");
cur = addrs;
while (cur && !have_ipv4 && !have_ipv6) {
if (!have_ipv4 && cur->ai_family == AF_INET) {
memcpy(&daddr, cur->ai_addr, sizeof(daddr));
daddr.sin_port = htons(dest_port);
have_ipv4 = 1;
}
else if (!have_ipv6 && cur->ai_family == AF_INET6) {
memcpy(&daddr6, cur->ai_addr, sizeof(daddr6));
daddr6.sin6_port = htons(dest_port);
have_ipv6 = 1;
}
cur = cur->ai_next;
}
if (addrs)
freeaddrinfo(addrs);
do_ipv4 &= have_ipv4;
do_ipv6 &= have_ipv6;
}
static void do_main(int family)
{
fprintf(stderr, "family: %s\n",
family == PF_INET ? "INET" : "INET6");
fprintf(stderr, "test SND\n");
do_test(family, SOF_TIMESTAMPING_TX_SOFTWARE);
fprintf(stderr, "test ENQ\n");
do_test(family, SOF_TIMESTAMPING_TX_SCHED);
fprintf(stderr, "test ENQ + SND\n");
do_test(family, SOF_TIMESTAMPING_TX_SCHED |
SOF_TIMESTAMPING_TX_SOFTWARE);
if (cfg_proto == SOCK_STREAM) {
fprintf(stderr, "\ntest ACK\n");
do_test(family, SOF_TIMESTAMPING_TX_ACK);
fprintf(stderr, "\ntest SND + ACK\n");
do_test(family, SOF_TIMESTAMPING_TX_SOFTWARE |
SOF_TIMESTAMPING_TX_ACK);
fprintf(stderr, "\ntest ENQ + SND + ACK\n");
do_test(family, SOF_TIMESTAMPING_TX_SCHED |
SOF_TIMESTAMPING_TX_SOFTWARE |
SOF_TIMESTAMPING_TX_ACK);
}
}
const char *sock_names[] = { NULL, "TCP", "UDP", "RAW" };
int main(int argc, char **argv)
{
if (argc == 1)
usage(argv[0]);
parse_opt(argc, argv);
resolve_hostname(argv[argc - 1]);
fprintf(stderr, "protocol: %s\n", sock_names[cfg_proto]);
fprintf(stderr, "payload: %u\n", cfg_payload_len);
fprintf(stderr, "server port: %u\n", dest_port);
fprintf(stderr, "\n");
if (do_ipv4)
do_main(PF_INET);
if (do_ipv6)
do_main(PF_INET6);
return 0;
}
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