// SPDX-License-Identifier: GPL-2.0-only /* * This program demonstrates how the various time stamping features in * the Linux kernel work. It emulates the behavior of a PTP * implementation in stand-alone master mode by sending PTPv1 Sync * multicasts once every second. It looks for similar packets, but * beyond that doesn't actually implement PTP. * * Outgoing packets are time stamped with SO_TIMESTAMPING with or * without hardware support. * * Incoming packets are time stamped with SO_TIMESTAMPING with or * without hardware support, SIOCGSTAMP[NS] (per-socket time stamp) and * SO_TIMESTAMP[NS]. * * Copyright (C) 2009 Intel Corporation. * Author: Patrick Ohly */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifndef SO_TIMESTAMPING # define SO_TIMESTAMPING 37 # define SCM_TIMESTAMPING SO_TIMESTAMPING #endif #ifndef SO_TIMESTAMPNS # define SO_TIMESTAMPNS 35 #endif static void usage(const char *error) { if (error) printf("invalid option: %s\n", error); printf("timestamping interface option*\n\n" "Options:\n" " IP_MULTICAST_LOOP - looping outgoing multicasts\n" " SO_TIMESTAMP - normal software time stamping, ms resolution\n" " SO_TIMESTAMPNS - more accurate software time stamping\n" " SOF_TIMESTAMPING_TX_HARDWARE - hardware time stamping of outgoing packets\n" " SOF_TIMESTAMPING_TX_SOFTWARE - software fallback for outgoing packets\n" " SOF_TIMESTAMPING_RX_HARDWARE - hardware time stamping of incoming packets\n" " SOF_TIMESTAMPING_RX_SOFTWARE - software fallback for incoming packets\n" " SOF_TIMESTAMPING_SOFTWARE - request reporting of software time stamps\n" " SOF_TIMESTAMPING_RAW_HARDWARE - request reporting of raw HW time stamps\n" " SIOCGSTAMP - check last socket time stamp\n" " SIOCGSTAMPNS - more accurate socket time stamp\n"); exit(1); } static void bail(const char *error) { printf("%s: %s\n", error, strerror(errno)); exit(1); } static const unsigned char sync[] = { 0x00, 0x01, 0x00, 0x01, 0x5f, 0x44, 0x46, 0x4c, 0x54, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01, /* fake uuid */ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x00, 0x01, 0x00, 0x37, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00, 0x49, 0x05, 0xcd, 0x01, 0x29, 0xb1, 0x8d, 0xb0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, /* fake uuid */ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x00, 0x00, 0x00, 0x37, 0x00, 0x00, 0x00, 0x04, 0x44, 0x46, 0x4c, 0x54, 0x00, 0x00, 0xf0, 0x60, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0xf0, 0x60, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x44, 0x46, 0x4c, 0x54, 0x00, 0x01, /* fake uuid */ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; static void sendpacket(int sock, struct sockaddr *addr, socklen_t addr_len) { struct timeval now; int res; res = sendto(sock, sync, sizeof(sync), 0, addr, addr_len); gettimeofday(&now, 0); if (res < 0) printf("%s: %s\n", "send", strerror(errno)); else printf("%ld.%06ld: sent %d bytes\n", (long)now.tv_sec, (long)now.tv_usec, res); } static void printpacket(struct msghdr *msg, int res, char *data, int sock, int recvmsg_flags, int siocgstamp, int siocgstampns) { struct sockaddr_in *from_addr = (struct sockaddr_in *)msg->msg_name; struct cmsghdr *cmsg; struct timeval tv; struct timespec ts; struct timeval now; gettimeofday(&now, 0); printf("%ld.%06ld: received %s data, %d bytes from %s, %zu bytes control messages\n", (long)now.tv_sec, (long)now.tv_usec, (recvmsg_flags & MSG_ERRQUEUE) ? "error" : "regular", res, inet_ntoa(from_addr->sin_addr), msg->msg_controllen); for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { printf(" cmsg len %zu: ", cmsg->cmsg_len); switch (cmsg->cmsg_level) { case SOL_SOCKET: printf("SOL_SOCKET "); switch (cmsg->cmsg_type) { case SO_TIMESTAMP: { struct timeval *stamp = (struct timeval *)CMSG_DATA(cmsg); printf("SO_TIMESTAMP %ld.%06ld", (long)stamp->tv_sec, (long)stamp->tv_usec); break; } case SO_TIMESTAMPNS: { struct timespec *stamp = (struct timespec *)CMSG_DATA(cmsg); printf("SO_TIMESTAMPNS %ld.%09ld", (long)stamp->tv_sec, (long)stamp->tv_nsec); break; } case SO_TIMESTAMPING: { struct timespec *stamp = (struct timespec *)CMSG_DATA(cmsg); printf("SO_TIMESTAMPING "); printf("SW %ld.%09ld ", (long)stamp->tv_sec, (long)stamp->tv_nsec); stamp++; /* skip deprecated HW transformed */ stamp++; printf("HW raw %ld.%09ld", (long)stamp->tv_sec, (long)stamp->tv_nsec); break; } default: printf("type %d", cmsg->cmsg_type); break; } break; case IPPROTO_IP: printf("IPPROTO_IP "); switch (cmsg->cmsg_type) { case IP_RECVERR: { struct sock_extended_err *err = (struct sock_extended_err *)CMSG_DATA(cmsg); printf("IP_RECVERR ee_errno '%s' ee_origin %d => %s", strerror(err->ee_errno), err->ee_origin, #ifdef SO_EE_ORIGIN_TIMESTAMPING err->ee_origin == SO_EE_ORIGIN_TIMESTAMPING ? "bounced packet" : "unexpected origin" #else "probably SO_EE_ORIGIN_TIMESTAMPING" #endif ); if (res < sizeof(sync)) printf(" => truncated data?!"); else if (!memcmp(sync, data + res - sizeof(sync), sizeof(sync))) printf(" => GOT OUR DATA BACK (HURRAY!)"); break; } case IP_PKTINFO: { struct in_pktinfo *pktinfo = (struct in_pktinfo *)CMSG_DATA(cmsg); printf("IP_PKTINFO interface index %u", pktinfo->ipi_ifindex); break; } default: printf("type %d", cmsg->cmsg_type); break; } break; default: printf("level %d type %d", cmsg->cmsg_level, cmsg->cmsg_type); break; } printf("\n"); } if (siocgstamp) { if (ioctl(sock, SIOCGSTAMP, &tv)) printf(" %s: %s\n", "SIOCGSTAMP", strerror(errno)); else printf("SIOCGSTAMP %ld.%06ld\n", (long)tv.tv_sec, (long)tv.tv_usec); } if (siocgstampns) { if (ioctl(sock, SIOCGSTAMPNS, &ts)) printf(" %s: %s\n", "SIOCGSTAMPNS", strerror(errno)); else printf("SIOCGSTAMPNS %ld.%09ld\n", (long)ts.tv_sec, (long)ts.tv_nsec); } } static void recvpacket(int sock, int recvmsg_flags, int siocgstamp, int siocgstampns) { char data[256]; struct msghdr msg; struct iovec entry; struct sockaddr_in from_addr; struct { struct cmsghdr cm; char control[512]; } control; int res; memset(&msg, 0, sizeof(msg)); msg.msg_iov = &entry; msg.msg_iovlen = 1; entry.iov_base = data; entry.iov_len = sizeof(data); msg.msg_name = (caddr_t)&from_addr; msg.msg_namelen = sizeof(from_addr); msg.msg_control = &control; msg.msg_controllen = sizeof(control); res = recvmsg(sock, &msg, recvmsg_flags|MSG_DONTWAIT); if (res < 0) { printf("%s %s: %s\n", "recvmsg", (recvmsg_flags & MSG_ERRQUEUE) ? "error" : "regular", strerror(errno)); } else { printpacket(&msg, res, data, sock, recvmsg_flags, siocgstamp, siocgstampns); } } int main(int argc, char **argv) { int so_timestamping_flags = 0; int so_timestamp = 0; int so_timestampns = 0; int siocgstamp = 0; int siocgstampns = 0; int ip_multicast_loop = 0; char *interface; int i; int enabled = 1; int sock; struct ifreq device; struct ifreq hwtstamp; struct hwtstamp_config hwconfig, hwconfig_requested; struct sockaddr_in addr; struct ip_mreq imr; struct in_addr iaddr; int val; socklen_t len; struct timeval next; size_t if_len; if (argc < 2) usage(0); interface = argv[1]; if_len = strlen(interface); if (if_len >= IFNAMSIZ) { printf("interface name exceeds IFNAMSIZ\n"); exit(1); } for (i = 2; i < argc; i++) { if (!strcasecmp(argv[i], "SO_TIMESTAMP")) so_timestamp = 1; else if (!strcasecmp(argv[i], "SO_TIMESTAMPNS")) so_timestampns = 1; else if (!strcasecmp(argv[i], "SIOCGSTAMP")) siocgstamp = 1; else if (!strcasecmp(argv[i], "SIOCGSTAMPNS")) siocgstampns = 1; else if (!strcasecmp(argv[i], "IP_MULTICAST_LOOP")) ip_multicast_loop = 1; else if (!strcasecmp(argv[i], "SOF_TIMESTAMPING_TX_HARDWARE")) so_timestamping_flags |= SOF_TIMESTAMPING_TX_HARDWARE; else if (!strcasecmp(argv[i], "SOF_TIMESTAMPING_TX_SOFTWARE")) so_timestamping_flags |= SOF_TIMESTAMPING_TX_SOFTWARE; else if (!strcasecmp(argv[i], "SOF_TIMESTAMPING_RX_HARDWARE")) so_timestamping_flags |= SOF_TIMESTAMPING_RX_HARDWARE; else if (!strcasecmp(argv[i], "SOF_TIMESTAMPING_RX_SOFTWARE")) so_timestamping_flags |= SOF_TIMESTAMPING_RX_SOFTWARE; else if (!strcasecmp(argv[i], "SOF_TIMESTAMPING_SOFTWARE")) so_timestamping_flags |= SOF_TIMESTAMPING_SOFTWARE; else if (!strcasecmp(argv[i], "SOF_TIMESTAMPING_RAW_HARDWARE")) so_timestamping_flags |= SOF_TIMESTAMPING_RAW_HARDWARE; else usage(argv[i]); } sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP); if (sock < 0) bail("socket"); memset(&device, 0, sizeof(device)); memcpy(device.ifr_name, interface, if_len + 1); if (ioctl(sock, SIOCGIFADDR, &device) < 0) bail("getting interface IP address"); memset(&hwtstamp, 0, sizeof(hwtstamp)); memcpy(hwtstamp.ifr_name, interface, if_len + 1); hwtstamp.ifr_data = (void *)&hwconfig; memset(&hwconfig, 0, sizeof(hwconfig)); hwconfig.tx_type = (so_timestamping_flags & SOF_TIMESTAMPING_TX_HARDWARE) ? HWTSTAMP_TX_ON : HWTSTAMP_TX_OFF; hwconfig.rx_filter = (so_timestamping_flags & SOF_TIMESTAMPING_RX_HARDWARE) ? HWTSTAMP_FILTER_PTP_V1_L4_SYNC : HWTSTAMP_FILTER_NONE; hwconfig_requested = hwconfig; if (ioctl(sock, SIOCSHWTSTAMP, &hwtstamp) < 0) { if ((errno == EINVAL || errno == ENOTSUP) && hwconfig_requested.tx_type == HWTSTAMP_TX_OFF && hwconfig_requested.rx_filter == HWTSTAMP_FILTER_NONE) printf("SIOCSHWTSTAMP: disabling hardware time stamping not possible\n"); else bail("SIOCSHWTSTAMP"); } printf("SIOCSHWTSTAMP: tx_type %d requested, got %d; rx_filter %d requested, got %d\n", hwconfig_requested.tx_type, hwconfig.tx_type, hwconfig_requested.rx_filter, hwconfig.rx_filter); /* bind to PTP port */ addr.sin_family = AF_INET; addr.sin_addr.s_addr = htonl(INADDR_ANY); addr.sin_port = htons(319 /* PTP event port */); if (bind(sock, (struct sockaddr *)&addr, sizeof(struct sockaddr_in)) < 0) bail("bind"); /* set multicast group for outgoing packets */ inet_aton("224.0.1.130", &iaddr); /* alternate PTP domain 1 */ addr.sin_addr = iaddr; imr.imr_multiaddr.s_addr = iaddr.s_addr; imr.imr_interface.s_addr = ((struct sockaddr_in *)&device.ifr_addr)->sin_addr.s_addr; if (setsockopt(sock, IPPROTO_IP, IP_MULTICAST_IF, &imr.imr_interface.s_addr, sizeof(struct in_addr)) < 0) bail("set multicast"); /* join multicast group, loop our own packet */ if (setsockopt(sock, IPPROTO_IP, IP_ADD_MEMBERSHIP, &imr, sizeof(struct ip_mreq)) < 0) bail("join multicast group"); if (setsockopt(sock, IPPROTO_IP, IP_MULTICAST_LOOP, &ip_multicast_loop, sizeof(enabled)) < 0) { bail("loop multicast"); } /* set socket options for time stamping */ if (so_timestamp && setsockopt(sock, SOL_SOCKET, SO_TIMESTAMP, &enabled, sizeof(enabled)) < 0) bail("setsockopt SO_TIMESTAMP"); if (so_timestampns && setsockopt(sock, SOL_SOCKET, SO_TIMESTAMPNS, &enabled, sizeof(enabled)) < 0) bail("setsockopt SO_TIMESTAMPNS"); if (so_timestamping_flags && setsockopt(sock, SOL_SOCKET, SO_TIMESTAMPING, &so_timestamping_flags, sizeof(so_timestamping_flags)) < 0) bail("setsockopt SO_TIMESTAMPING"); /* request IP_PKTINFO for debugging purposes */ if (setsockopt(sock, SOL_IP, IP_PKTINFO, &enabled, sizeof(enabled)) < 0) printf("%s: %s\n", "setsockopt IP_PKTINFO", strerror(errno)); /* verify socket options */ len = sizeof(val); if (getsockopt(sock, SOL_SOCKET, SO_TIMESTAMP, &val, &len) < 0) printf("%s: %s\n", "getsockopt SO_TIMESTAMP", strerror(errno)); else printf("SO_TIMESTAMP %d\n", val); if (getsockopt(sock, SOL_SOCKET, SO_TIMESTAMPNS, &val, &len) < 0) printf("%s: %s\n", "getsockopt SO_TIMESTAMPNS", strerror(errno)); else printf("SO_TIMESTAMPNS %d\n", val); if (getsockopt(sock, SOL_SOCKET, SO_TIMESTAMPING, &val, &len) < 0) { printf("%s: %s\n", "getsockopt SO_TIMESTAMPING", strerror(errno)); } else { printf("SO_TIMESTAMPING %d\n", val); if (val != so_timestamping_flags) printf(" not the expected value %d\n", so_timestamping_flags); } /* send packets forever every five seconds */ gettimeofday(&next, 0); next.tv_sec = (next.tv_sec + 1) / 5 * 5; next.tv_usec = 0; while (1) { struct timeval now; struct timeval delta; long delta_us; int res; fd_set readfs, errorfs; gettimeofday(&now, 0); delta_us = (long)(next.tv_sec - now.tv_sec) * 1000000 + (long)(next.tv_usec - now.tv_usec); if (delta_us > 0) { /* continue waiting for timeout or data */ delta.tv_sec = delta_us / 1000000; delta.tv_usec = delta_us % 1000000; FD_ZERO(&readfs); FD_ZERO(&errorfs); FD_SET(sock, &readfs); FD_SET(sock, &errorfs); printf("%ld.%06ld: select %ldus\n", (long)now.tv_sec, (long)now.tv_usec, delta_us); res = select(sock + 1, &readfs, 0, &errorfs, &delta); gettimeofday(&now, 0); printf("%ld.%06ld: select returned: %d, %s\n", (long)now.tv_sec, (long)now.tv_usec, res, res < 0 ? strerror(errno) : "success"); if (res > 0) { if (FD_ISSET(sock, &readfs)) printf("ready for reading\n"); if (FD_ISSET(sock, &errorfs)) printf("has error\n"); recvpacket(sock, 0, siocgstamp, siocgstampns); recvpacket(sock, MSG_ERRQUEUE, siocgstamp, siocgstampns); } } else { /* write one packet */ sendpacket(sock, (struct sockaddr *)&addr, sizeof(addr)); next.tv_sec += 5; continue; } } return 0; }