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linux/tools/testing/selftests/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.
*/
#define _GNU_SOURCE
#include <arpa/inet.h>
#include <asm/types.h>
#include <error.h>
#include <errno.h>
#include <inttypes.h>
#include <linux/errqueue.h>
#include <linux/if_ether.h>
#include <linux/ipv6.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 <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>
/* 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 int cfg_poll_timeout = 100;
static int cfg_delay_snd;
static int cfg_delay_ack;
static bool cfg_show_payload;
static bool cfg_do_pktinfo;
static bool cfg_loop_nodata;
static bool cfg_no_delay;
static bool cfg_use_cmsg;
static bool cfg_use_pf_packet;
static bool cfg_do_listen;
static uint16_t dest_port = 9000;
static struct sockaddr_in daddr;
static struct sockaddr_in6 daddr6;
static struct timespec ts_usr;
static int saved_tskey = -1;
static int saved_tskey_type = -1;
static bool test_failed;
static int64_t timespec_to_us64(struct timespec *ts)
{
return ts->tv_sec * 1000 * 1000 + ts->tv_nsec / 1000;
}
static void validate_key(int tskey, int tstype)
{
int stepsize;
/* compare key for each subsequent request
* must only test for one type, the first one requested
*/
if (saved_tskey == -1)
saved_tskey_type = tstype;
else if (saved_tskey_type != tstype)
return;
stepsize = cfg_proto == SOCK_STREAM ? cfg_payload_len : 1;
if (tskey != saved_tskey + stepsize) {
fprintf(stderr, "ERROR: key %d, expected %d\n",
tskey, saved_tskey + stepsize);
test_failed = true;
}
saved_tskey = tskey;
}
static void validate_timestamp(struct timespec *cur, int min_delay)
{
int max_delay = min_delay + 500 /* processing time upper bound */;
int64_t cur64, start64;
cur64 = timespec_to_us64(cur);
start64 = timespec_to_us64(&ts_usr);
if (cur64 < start64 + min_delay || cur64 > start64 + max_delay) {
fprintf(stderr, "ERROR: delay %lu expected between %d and %d\n",
cur64 - start64, min_delay, max_delay);
test_failed = true;
}
}
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 (cur != &ts_usr)
fprintf(stderr, " (USR %+" PRId64 " us)",
timespec_to_us64(cur) - timespec_to_us64(&ts_usr));
fprintf(stderr, "\n");
}
static void print_timestamp_usr(void)
{
if (clock_gettime(CLOCK_REALTIME, &ts_usr))
error(1, errno, "clock_gettime");
__print_timestamp(" USR", &ts_usr, 0, 0);
}
static void print_timestamp(struct scm_timestamping *tss, int tstype,
int tskey, int payload_len)
{
const char *tsname;
validate_key(tskey, tstype);
switch (tstype) {
case SCM_TSTAMP_SCHED:
tsname = " ENQ";
validate_timestamp(&tss->ts[0], 0);
break;
case SCM_TSTAMP_SND:
tsname = " SND";
validate_timestamp(&tss->ts[0], cfg_delay_snd);
break;
case SCM_TSTAMP_ACK:
tsname = " ACK";
validate_timestamp(&tss->ts[0], cfg_delay_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)
return;
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, cfg_poll_timeout);
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;
int batch = 0;
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) ||
(cm->cmsg_level == SOL_PACKET &&
cm->cmsg_type == PACKET_TX_TIMESTAMP)) {
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);
serr = NULL;
tss = NULL;
batch++;
}
}
if (batch > 1)
fprintf(stderr, "batched %d timestamps\n", batch);
}
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 uint16_t get_ip_csum(const uint16_t *start, int num_words,
unsigned long sum)
{
int i;
for (i = 0; i < num_words; i++)
sum += start[i];
while (sum >> 16)
sum = (sum & 0xFFFF) + (sum >> 16);
return ~sum;
}
static uint16_t get_udp_csum(const struct udphdr *udph, int alen)
{
unsigned long pseudo_sum, csum_len;
const void *csum_start = udph;
pseudo_sum = htons(IPPROTO_UDP);
pseudo_sum += udph->len;
/* checksum ip(v6) addresses + udp header + payload */
csum_start -= alen * 2;
csum_len = ntohs(udph->len) + alen * 2;
return get_ip_csum(csum_start, csum_len >> 1, pseudo_sum);
}
static int fill_header_ipv4(void *p)
{
struct iphdr *iph = p;
memset(iph, 0, sizeof(*iph));
iph->ihl = 5;
iph->version = 4;
iph->ttl = 2;
iph->saddr = daddr.sin_addr.s_addr; /* set for udp csum calc */
iph->daddr = daddr.sin_addr.s_addr;
iph->protocol = IPPROTO_UDP;
/* kernel writes saddr, csum, len */
return sizeof(*iph);
}
static int fill_header_ipv6(void *p)
{
struct ipv6hdr *ip6h = p;
memset(ip6h, 0, sizeof(*ip6h));
ip6h->version = 6;
ip6h->payload_len = htons(sizeof(struct udphdr) + cfg_payload_len);
ip6h->nexthdr = IPPROTO_UDP;
ip6h->hop_limit = 64;
ip6h->saddr = daddr6.sin6_addr;
ip6h->daddr = daddr6.sin6_addr;
/* kernel does not write saddr in case of ipv6 */
return sizeof(*ip6h);
}
static void fill_header_udp(void *p, bool is_ipv4)
{
struct udphdr *udph = p;
udph->source = ntohs(dest_port + 1); /* spoof */
udph->dest = ntohs(dest_port);
udph->len = ntohs(sizeof(*udph) + cfg_payload_len);
udph->check = 0;
udph->check = get_udp_csum(udph, is_ipv4 ? sizeof(struct in_addr) :
sizeof(struct in6_addr));
}
static void do_test(int family, unsigned int report_opt)
{
char control[CMSG_SPACE(sizeof(uint32_t))];
struct sockaddr_ll laddr;
unsigned int sock_opt;
struct cmsghdr *cmsg;
struct msghdr msg;
struct iovec iov;
char *buf;
int fd, i, val = 1, total_len;
total_len = cfg_payload_len;
if (cfg_use_pf_packet || cfg_proto == SOCK_RAW) {
total_len += sizeof(struct udphdr);
if (cfg_use_pf_packet || cfg_ipproto == IPPROTO_RAW)
if (family == PF_INET)
total_len += sizeof(struct iphdr);
else
total_len += sizeof(struct ipv6hdr);
/* special case, only rawv6_sendmsg:
* pass proto in sin6_port if not connected
* also see ANK comment in net/ipv4/raw.c
*/
daddr6.sin6_port = htons(cfg_ipproto);
}
buf = malloc(total_len);
if (!buf)
error(1, 0, "malloc");
fd = socket(cfg_use_pf_packet ? PF_PACKET : family,
cfg_proto, cfg_ipproto);
if (fd < 0)
error(1, errno, "socket");
/* reset expected key on each new socket */
saved_tskey = -1;
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");
}
}
sock_opt = SOF_TIMESTAMPING_SOFTWARE |
SOF_TIMESTAMPING_OPT_CMSG |
SOF_TIMESTAMPING_OPT_ID;
if (!cfg_use_cmsg)
sock_opt |= report_opt;
if (cfg_loop_nodata)
sock_opt |= SOF_TIMESTAMPING_OPT_TSONLY;
if (setsockopt(fd, SOL_SOCKET, SO_TIMESTAMPING,
(char *) &sock_opt, sizeof(sock_opt)))
error(1, 0, "setsockopt timestamping");
for (i = 0; i < cfg_num_pkts; i++) {
memset(&msg, 0, sizeof(msg));
memset(buf, 'a' + i, total_len);
if (cfg_use_pf_packet || cfg_proto == SOCK_RAW) {
int off = 0;
if (cfg_use_pf_packet || cfg_ipproto == IPPROTO_RAW) {
if (family == PF_INET)
off = fill_header_ipv4(buf);
else
off = fill_header_ipv6(buf);
}
fill_header_udp(buf + off, family == PF_INET);
}
print_timestamp_usr();
iov.iov_base = buf;
iov.iov_len = total_len;
if (cfg_proto != SOCK_STREAM) {
if (cfg_use_pf_packet) {
memset(&laddr, 0, sizeof(laddr));
laddr.sll_family = AF_PACKET;
laddr.sll_ifindex = 1;
laddr.sll_protocol = htons(family == AF_INET ? ETH_P_IP : ETH_P_IPV6);
laddr.sll_halen = ETH_ALEN;
msg.msg_name = (void *)&laddr;
msg.msg_namelen = sizeof(laddr);
} else if (family == PF_INET) {
msg.msg_name = (void *)&daddr;
msg.msg_namelen = sizeof(daddr);
} else {
msg.msg_name = (void *)&daddr6;
msg.msg_namelen = sizeof(daddr6);
}
}
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
if (cfg_use_cmsg) {
memset(control, 0, sizeof(control));
msg.msg_control = control;
msg.msg_controllen = sizeof(control);
cmsg = CMSG_FIRSTHDR(&msg);
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SO_TIMESTAMPING;
cmsg->cmsg_len = CMSG_LEN(sizeof(uint32_t));
*((uint32_t *) CMSG_DATA(cmsg)) = report_opt;
}
val = sendmsg(fd, &msg, 0);
if (val != total_len)
error(1, errno, "send");
/* wait for all errors to be queued, else ACKs arrive OOO */
if (!cfg_no_delay)
usleep(50 * 1000);
__poll(fd);
while (!recv_errmsg(fd)) {}
}
if (close(fd))
error(1, errno, "close");
free(buf);
usleep(100 * 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"
" -c N: number of packets for each test\n"
" -C: use cmsg to set tstamp recording options\n"
" -D: no delay between packets\n"
" -F: poll() waits forever for an event\n"
" -I: request PKTINFO\n"
" -l N: send N bytes at a time\n"
" -L listen on hostname and port\n"
" -n: set no-payload option\n"
" -p N: connect to port N\n"
" -P: use PF_PACKET\n"
" -r: use raw\n"
" -R: use raw (IP_HDRINCL)\n"
" -u: use udp\n"
" -v: validate SND delay (usec)\n"
" -V: validate ACK delay (usec)\n"
" -x: show payload (up to 70 bytes)\n",
filepath);
exit(1);
}
static void parse_opt(int argc, char **argv)
{
int proto_count = 0;
int c;
while ((c = getopt(argc, argv, "46c:CDFhIl:Lnp:PrRuv:V:x")) != -1) {
switch (c) {
case '4':
do_ipv6 = 0;
break;
case '6':
do_ipv4 = 0;
break;
case 'c':
cfg_num_pkts = strtoul(optarg, NULL, 10);
break;
case 'C':
cfg_use_cmsg = true;
break;
case 'D':
cfg_no_delay = true;
break;
case 'F':
cfg_poll_timeout = -1;
break;
case 'I':
cfg_do_pktinfo = true;
break;
case 'l':
cfg_payload_len = strtoul(optarg, NULL, 10);
break;
case 'L':
cfg_do_listen = true;
break;
case 'n':
cfg_loop_nodata = true;
break;
case 'p':
dest_port = strtoul(optarg, NULL, 10);
break;
case 'P':
proto_count++;
cfg_use_pf_packet = true;
cfg_proto = SOCK_DGRAM;
cfg_ipproto = 0;
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 'v':
cfg_delay_snd = strtoul(optarg, NULL, 10);
break;
case 'V':
cfg_delay_ack = 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 -P, -r, -R or -u, not multiple");
if (cfg_do_pktinfo && cfg_use_pf_packet)
error(1, 0, "cannot ask for pktinfo over pf_packet");
if (optind != argc - 1)
error(1, 0, "missing required hostname argument");
}
static void resolve_hostname(const char *hostname)
{
struct addrinfo hints = { .ai_family = do_ipv4 ? AF_INET : AF_INET6 };
struct addrinfo *addrs, *cur;
int have_ipv4 = 0, have_ipv6 = 0;
retry:
if (getaddrinfo(hostname, NULL, &hints, &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);
if (do_ipv6 && hints.ai_family != AF_INET6) {
hints.ai_family = AF_INET6;
goto retry;
}
do_ipv4 &= have_ipv4;
do_ipv6 &= have_ipv6;
}
static void do_listen(int family, void *addr, int alen)
{
int fd, type;
type = cfg_proto == SOCK_RAW ? SOCK_DGRAM : cfg_proto;
fd = socket(family, type, 0);
if (fd == -1)
error(1, errno, "socket rx");
if (bind(fd, addr, alen))
error(1, errno, "bind rx");
if (type == SOCK_STREAM && listen(fd, 10))
error(1, errno, "listen rx");
/* leave fd open, will be closed on process exit.
* this enables connect() to succeed and avoids icmp replies
*/
}
static void do_main(int family)
{
fprintf(stderr, "family: %s %s\n",
family == PF_INET ? "INET" : "INET6",
cfg_use_pf_packet ? "(PF_PACKET)" : "");
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) {
if (cfg_do_listen)
do_listen(PF_INET, &daddr, sizeof(daddr));
do_main(PF_INET);
}
if (do_ipv6) {
if (cfg_do_listen)
do_listen(PF_INET6, &daddr6, sizeof(daddr6));
do_main(PF_INET6);
}
return test_failed;
}
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