515 lines
12 KiB
C
515 lines
12 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Test the SO_TXTIME API
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*
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* Takes a stream of { payload, delivery time }[], to be sent across two
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* processes. Start this program on two separate network namespaces or
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* connected hosts, one instance in transmit mode and the other in receive
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* mode using the '-r' option. Receiver will compare arrival timestamps to
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* the expected stream. Sender will read transmit timestamps from the error
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* queue. The streams can differ due to out-of-order delivery and drops.
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*/
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#define _GNU_SOURCE
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#include <arpa/inet.h>
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#include <error.h>
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#include <errno.h>
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#include <inttypes.h>
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#include <linux/net_tstamp.h>
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#include <linux/errqueue.h>
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#include <linux/if_ether.h>
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#include <linux/ipv6.h>
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#include <linux/udp.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <time.h>
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#include <unistd.h>
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#include <poll.h>
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static int cfg_clockid = CLOCK_TAI;
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static uint16_t cfg_port = 8000;
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static int cfg_variance_us = 4000;
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static uint64_t cfg_start_time_ns;
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static int cfg_mark;
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static bool cfg_rx;
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static uint64_t glob_tstart;
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static uint64_t tdeliver_max;
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/* encode one timed transmission (of a 1B payload) */
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struct timed_send {
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char data;
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int64_t delay_us;
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};
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#define MAX_NUM_PKT 8
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static struct timed_send cfg_buf[MAX_NUM_PKT];
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static int cfg_num_pkt;
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static int cfg_errq_level;
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static int cfg_errq_type;
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static struct sockaddr_storage cfg_dst_addr;
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static struct sockaddr_storage cfg_src_addr;
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static socklen_t cfg_alen;
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static uint64_t gettime_ns(clockid_t clock)
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{
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struct timespec ts;
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if (clock_gettime(clock, &ts))
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error(1, errno, "gettime");
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return ts.tv_sec * (1000ULL * 1000 * 1000) + ts.tv_nsec;
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}
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static void do_send_one(int fdt, struct timed_send *ts)
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{
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char control[CMSG_SPACE(sizeof(uint64_t))];
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struct msghdr msg = {0};
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struct iovec iov = {0};
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struct cmsghdr *cm;
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uint64_t tdeliver;
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int ret;
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iov.iov_base = &ts->data;
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iov.iov_len = 1;
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msg.msg_iov = &iov;
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msg.msg_iovlen = 1;
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msg.msg_name = (struct sockaddr *)&cfg_dst_addr;
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msg.msg_namelen = cfg_alen;
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if (ts->delay_us >= 0) {
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memset(control, 0, sizeof(control));
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msg.msg_control = &control;
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msg.msg_controllen = sizeof(control);
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tdeliver = glob_tstart + ts->delay_us * 1000;
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tdeliver_max = tdeliver_max > tdeliver ?
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tdeliver_max : tdeliver;
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cm = CMSG_FIRSTHDR(&msg);
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cm->cmsg_level = SOL_SOCKET;
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cm->cmsg_type = SCM_TXTIME;
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cm->cmsg_len = CMSG_LEN(sizeof(tdeliver));
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memcpy(CMSG_DATA(cm), &tdeliver, sizeof(tdeliver));
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}
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ret = sendmsg(fdt, &msg, 0);
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if (ret == -1)
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error(1, errno, "write");
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if (ret == 0)
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error(1, 0, "write: 0B");
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}
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static void do_recv_one(int fdr, struct timed_send *ts)
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{
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int64_t tstop, texpect;
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char rbuf[2];
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int ret;
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ret = recv(fdr, rbuf, sizeof(rbuf), 0);
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if (ret == -1 && errno == EAGAIN)
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error(1, EAGAIN, "recv: timeout");
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if (ret == -1)
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error(1, errno, "read");
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if (ret != 1)
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error(1, 0, "read: %dB", ret);
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tstop = (gettime_ns(cfg_clockid) - glob_tstart) / 1000;
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texpect = ts->delay_us >= 0 ? ts->delay_us : 0;
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fprintf(stderr, "payload:%c delay:%lld expected:%lld (us)\n",
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rbuf[0], (long long)tstop, (long long)texpect);
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if (rbuf[0] != ts->data)
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error(1, 0, "payload mismatch. expected %c", ts->data);
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if (llabs(tstop - texpect) > cfg_variance_us)
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error(1, 0, "exceeds variance (%d us)", cfg_variance_us);
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}
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static void do_recv_verify_empty(int fdr)
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{
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char rbuf[1];
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int ret;
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ret = recv(fdr, rbuf, sizeof(rbuf), 0);
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if (ret != -1 || errno != EAGAIN)
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error(1, 0, "recv: not empty as expected (%d, %d)", ret, errno);
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}
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static int do_recv_errqueue_timeout(int fdt)
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{
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char control[CMSG_SPACE(sizeof(struct sock_extended_err)) +
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CMSG_SPACE(sizeof(struct sockaddr_in6))] = {0};
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char data[sizeof(struct ethhdr) + sizeof(struct ipv6hdr) +
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sizeof(struct udphdr) + 1];
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struct sock_extended_err *err;
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int ret, num_tstamp = 0;
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struct msghdr msg = {0};
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struct iovec iov = {0};
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struct cmsghdr *cm;
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int64_t tstamp = 0;
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iov.iov_base = data;
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iov.iov_len = sizeof(data);
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msg.msg_iov = &iov;
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msg.msg_iovlen = 1;
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msg.msg_control = control;
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msg.msg_controllen = sizeof(control);
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while (1) {
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const char *reason;
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ret = recvmsg(fdt, &msg, MSG_ERRQUEUE);
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if (ret == -1 && errno == EAGAIN)
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break;
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if (ret == -1)
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error(1, errno, "errqueue");
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if (msg.msg_flags != MSG_ERRQUEUE)
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error(1, 0, "errqueue: flags 0x%x\n", msg.msg_flags);
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cm = CMSG_FIRSTHDR(&msg);
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if (cm->cmsg_level != cfg_errq_level ||
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cm->cmsg_type != cfg_errq_type)
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error(1, 0, "errqueue: type 0x%x.0x%x\n",
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cm->cmsg_level, cm->cmsg_type);
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err = (struct sock_extended_err *)CMSG_DATA(cm);
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if (err->ee_origin != SO_EE_ORIGIN_TXTIME)
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error(1, 0, "errqueue: origin 0x%x\n", err->ee_origin);
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switch (err->ee_errno) {
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case ECANCELED:
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if (err->ee_code != SO_EE_CODE_TXTIME_MISSED)
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error(1, 0, "errqueue: unknown ECANCELED %u\n",
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err->ee_code);
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reason = "missed txtime";
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break;
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case EINVAL:
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if (err->ee_code != SO_EE_CODE_TXTIME_INVALID_PARAM)
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error(1, 0, "errqueue: unknown EINVAL %u\n",
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err->ee_code);
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reason = "invalid txtime";
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break;
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default:
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error(1, 0, "errqueue: errno %u code %u\n",
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err->ee_errno, err->ee_code);
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}
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tstamp = ((int64_t) err->ee_data) << 32 | err->ee_info;
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tstamp -= (int64_t) glob_tstart;
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tstamp /= 1000 * 1000;
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fprintf(stderr, "send: pkt %c at %" PRId64 "ms dropped: %s\n",
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data[ret - 1], tstamp, reason);
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msg.msg_flags = 0;
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msg.msg_controllen = sizeof(control);
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num_tstamp++;
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}
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return num_tstamp;
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}
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static void recv_errqueue_msgs(int fdt)
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{
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struct pollfd pfd = { .fd = fdt, .events = POLLERR };
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const int timeout_ms = 10;
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int ret, num_tstamp = 0;
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do {
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ret = poll(&pfd, 1, timeout_ms);
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if (ret == -1)
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error(1, errno, "poll");
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if (ret && (pfd.revents & POLLERR))
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num_tstamp += do_recv_errqueue_timeout(fdt);
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if (num_tstamp == cfg_num_pkt)
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break;
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} while (gettime_ns(cfg_clockid) < tdeliver_max);
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}
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static void start_time_wait(void)
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{
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uint64_t now;
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int err;
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if (!cfg_start_time_ns)
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return;
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now = gettime_ns(CLOCK_REALTIME);
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if (cfg_start_time_ns < now)
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return;
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err = usleep((cfg_start_time_ns - now) / 1000);
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if (err)
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error(1, errno, "usleep");
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}
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static void setsockopt_txtime(int fd)
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{
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struct sock_txtime so_txtime_val = { .clockid = cfg_clockid };
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struct sock_txtime so_txtime_val_read = { 0 };
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socklen_t vallen = sizeof(so_txtime_val);
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so_txtime_val.flags = SOF_TXTIME_REPORT_ERRORS;
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if (setsockopt(fd, SOL_SOCKET, SO_TXTIME,
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&so_txtime_val, sizeof(so_txtime_val)))
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error(1, errno, "setsockopt txtime");
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if (getsockopt(fd, SOL_SOCKET, SO_TXTIME,
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&so_txtime_val_read, &vallen))
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error(1, errno, "getsockopt txtime");
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if (vallen != sizeof(so_txtime_val) ||
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memcmp(&so_txtime_val, &so_txtime_val_read, vallen))
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error(1, 0, "getsockopt txtime: mismatch");
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}
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static int setup_tx(struct sockaddr *addr, socklen_t alen)
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{
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int fd;
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fd = socket(addr->sa_family, SOCK_DGRAM, 0);
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if (fd == -1)
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error(1, errno, "socket t");
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if (connect(fd, addr, alen))
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error(1, errno, "connect");
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setsockopt_txtime(fd);
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if (cfg_mark &&
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setsockopt(fd, SOL_SOCKET, SO_MARK, &cfg_mark, sizeof(cfg_mark)))
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error(1, errno, "setsockopt mark");
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return fd;
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}
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static int setup_rx(struct sockaddr *addr, socklen_t alen)
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{
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struct timeval tv = { .tv_usec = 100 * 1000 };
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int fd;
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fd = socket(addr->sa_family, SOCK_DGRAM, 0);
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if (fd == -1)
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error(1, errno, "socket r");
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if (bind(fd, addr, alen))
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error(1, errno, "bind");
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if (setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)))
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error(1, errno, "setsockopt rcv timeout");
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return fd;
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}
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static void do_test_tx(struct sockaddr *addr, socklen_t alen)
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{
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int fdt, i;
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fprintf(stderr, "\nSO_TXTIME ipv%c clock %s\n",
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addr->sa_family == PF_INET ? '4' : '6',
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cfg_clockid == CLOCK_TAI ? "tai" : "monotonic");
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fdt = setup_tx(addr, alen);
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start_time_wait();
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glob_tstart = gettime_ns(cfg_clockid);
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for (i = 0; i < cfg_num_pkt; i++)
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do_send_one(fdt, &cfg_buf[i]);
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recv_errqueue_msgs(fdt);
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if (close(fdt))
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error(1, errno, "close t");
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}
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static void do_test_rx(struct sockaddr *addr, socklen_t alen)
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{
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int fdr, i;
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fdr = setup_rx(addr, alen);
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start_time_wait();
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glob_tstart = gettime_ns(cfg_clockid);
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for (i = 0; i < cfg_num_pkt; i++)
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do_recv_one(fdr, &cfg_buf[i]);
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do_recv_verify_empty(fdr);
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if (close(fdr))
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error(1, errno, "close r");
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}
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static void setup_sockaddr(int domain, const char *str_addr,
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struct sockaddr_storage *sockaddr)
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{
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struct sockaddr_in6 *addr6 = (void *) sockaddr;
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struct sockaddr_in *addr4 = (void *) sockaddr;
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switch (domain) {
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case PF_INET:
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memset(addr4, 0, sizeof(*addr4));
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||
|
|
addr4->sin_family = AF_INET;
|
||
|
|
addr4->sin_port = htons(cfg_port);
|
||
|
|
if (str_addr &&
|
||
|
|
inet_pton(AF_INET, str_addr, &(addr4->sin_addr)) != 1)
|
||
|
|
error(1, 0, "ipv4 parse error: %s", str_addr);
|
||
|
|
break;
|
||
|
|
case PF_INET6:
|
||
|
|
memset(addr6, 0, sizeof(*addr6));
|
||
|
|
addr6->sin6_family = AF_INET6;
|
||
|
|
addr6->sin6_port = htons(cfg_port);
|
||
|
|
if (str_addr &&
|
||
|
|
inet_pton(AF_INET6, str_addr, &(addr6->sin6_addr)) != 1)
|
||
|
|
error(1, 0, "ipv6 parse error: %s", str_addr);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static int parse_io(const char *optarg, struct timed_send *array)
|
||
|
|
{
|
||
|
|
char *arg, *tok;
|
||
|
|
int aoff = 0;
|
||
|
|
|
||
|
|
arg = strdup(optarg);
|
||
|
|
if (!arg)
|
||
|
|
error(1, errno, "strdup");
|
||
|
|
|
||
|
|
while ((tok = strtok(arg, ","))) {
|
||
|
|
arg = NULL; /* only pass non-zero on first call */
|
||
|
|
|
||
|
|
if (aoff / 2 == MAX_NUM_PKT)
|
||
|
|
error(1, 0, "exceeds max pkt count (%d)", MAX_NUM_PKT);
|
||
|
|
|
||
|
|
if (aoff & 1) { /* parse delay */
|
||
|
|
array->delay_us = strtol(tok, NULL, 0) * 1000;
|
||
|
|
array++;
|
||
|
|
} else { /* parse character */
|
||
|
|
array->data = tok[0];
|
||
|
|
}
|
||
|
|
|
||
|
|
aoff++;
|
||
|
|
}
|
||
|
|
|
||
|
|
free(arg);
|
||
|
|
|
||
|
|
return aoff / 2;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void usage(const char *progname)
|
||
|
|
{
|
||
|
|
fprintf(stderr, "\nUsage: %s [options] <payload>\n"
|
||
|
|
"Options:\n"
|
||
|
|
" -4 only IPv4\n"
|
||
|
|
" -6 only IPv6\n"
|
||
|
|
" -c <clock> monotonic or tai (default)\n"
|
||
|
|
" -D <addr> destination IP address (server)\n"
|
||
|
|
" -S <addr> source IP address (client)\n"
|
||
|
|
" -r run rx mode\n"
|
||
|
|
" -t <nsec> start time (UTC nanoseconds)\n"
|
||
|
|
" -m <mark> socket mark\n"
|
||
|
|
"\n",
|
||
|
|
progname);
|
||
|
|
exit(1);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void parse_opts(int argc, char **argv)
|
||
|
|
{
|
||
|
|
char *daddr = NULL, *saddr = NULL;
|
||
|
|
int domain = PF_UNSPEC;
|
||
|
|
int c;
|
||
|
|
|
||
|
|
while ((c = getopt(argc, argv, "46c:S:D:rt:m:")) != -1) {
|
||
|
|
switch (c) {
|
||
|
|
case '4':
|
||
|
|
if (domain != PF_UNSPEC)
|
||
|
|
error(1, 0, "Pass one of -4 or -6");
|
||
|
|
domain = PF_INET;
|
||
|
|
cfg_alen = sizeof(struct sockaddr_in);
|
||
|
|
cfg_errq_level = SOL_IP;
|
||
|
|
cfg_errq_type = IP_RECVERR;
|
||
|
|
break;
|
||
|
|
case '6':
|
||
|
|
if (domain != PF_UNSPEC)
|
||
|
|
error(1, 0, "Pass one of -4 or -6");
|
||
|
|
domain = PF_INET6;
|
||
|
|
cfg_alen = sizeof(struct sockaddr_in6);
|
||
|
|
cfg_errq_level = SOL_IPV6;
|
||
|
|
cfg_errq_type = IPV6_RECVERR;
|
||
|
|
break;
|
||
|
|
case 'c':
|
||
|
|
if (!strcmp(optarg, "tai"))
|
||
|
|
cfg_clockid = CLOCK_TAI;
|
||
|
|
else if (!strcmp(optarg, "monotonic") ||
|
||
|
|
!strcmp(optarg, "mono"))
|
||
|
|
cfg_clockid = CLOCK_MONOTONIC;
|
||
|
|
else
|
||
|
|
error(1, 0, "unknown clock id %s", optarg);
|
||
|
|
break;
|
||
|
|
case 'S':
|
||
|
|
saddr = optarg;
|
||
|
|
break;
|
||
|
|
case 'D':
|
||
|
|
daddr = optarg;
|
||
|
|
break;
|
||
|
|
case 'r':
|
||
|
|
cfg_rx = true;
|
||
|
|
break;
|
||
|
|
case 't':
|
||
|
|
cfg_start_time_ns = strtoll(optarg, NULL, 0);
|
||
|
|
break;
|
||
|
|
case 'm':
|
||
|
|
cfg_mark = strtol(optarg, NULL, 0);
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
usage(argv[0]);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (argc - optind != 1)
|
||
|
|
usage(argv[0]);
|
||
|
|
|
||
|
|
if (domain == PF_UNSPEC)
|
||
|
|
error(1, 0, "Pass one of -4 or -6");
|
||
|
|
if (!daddr)
|
||
|
|
error(1, 0, "-D <server addr> required\n");
|
||
|
|
if (!cfg_rx && !saddr)
|
||
|
|
error(1, 0, "-S <client addr> required\n");
|
||
|
|
|
||
|
|
setup_sockaddr(domain, daddr, &cfg_dst_addr);
|
||
|
|
setup_sockaddr(domain, saddr, &cfg_src_addr);
|
||
|
|
|
||
|
|
cfg_num_pkt = parse_io(argv[optind], cfg_buf);
|
||
|
|
}
|
||
|
|
|
||
|
|
int main(int argc, char **argv)
|
||
|
|
{
|
||
|
|
parse_opts(argc, argv);
|
||
|
|
|
||
|
|
if (cfg_rx)
|
||
|
|
do_test_rx((void *)&cfg_dst_addr, cfg_alen);
|
||
|
|
else
|
||
|
|
do_test_tx((void *)&cfg_src_addr, cfg_alen);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|