507 lines
12 KiB
C
507 lines
12 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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#include <errno.h>
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#include <error.h>
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#include <netdb.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include <linux/errqueue.h>
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#include <linux/icmp.h>
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#include <linux/icmpv6.h>
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#include <linux/net_tstamp.h>
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#include <linux/types.h>
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#include <linux/udp.h>
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#include <sys/socket.h>
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#include "../kselftest.h"
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enum {
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ERN_SUCCESS = 0,
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/* Well defined errors, callers may depend on these */
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ERN_SEND = 1,
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/* Informational, can reorder */
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ERN_HELP,
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ERN_SEND_SHORT,
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ERN_SOCK_CREATE,
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ERN_RESOLVE,
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ERN_CMSG_WR,
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ERN_SOCKOPT,
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ERN_GETTIME,
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ERN_RECVERR,
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ERN_CMSG_RD,
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ERN_CMSG_RCV,
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};
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struct option_cmsg_u32 {
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bool ena;
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unsigned int val;
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};
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struct options {
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bool silent_send;
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const char *host;
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const char *service;
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unsigned int size;
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struct {
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unsigned int mark;
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unsigned int dontfrag;
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unsigned int tclass;
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unsigned int hlimit;
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} sockopt;
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struct {
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unsigned int family;
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unsigned int type;
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unsigned int proto;
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} sock;
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struct option_cmsg_u32 mark;
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struct {
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bool ena;
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unsigned int delay;
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} txtime;
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struct {
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bool ena;
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} ts;
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struct {
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struct option_cmsg_u32 dontfrag;
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struct option_cmsg_u32 tclass;
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struct option_cmsg_u32 hlimit;
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struct option_cmsg_u32 exthdr;
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} v6;
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} opt = {
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.size = 13,
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.sock = {
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.family = AF_UNSPEC,
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.type = SOCK_DGRAM,
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.proto = IPPROTO_UDP,
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},
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};
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static struct timespec time_start_real;
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static struct timespec time_start_mono;
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static void __attribute__((noreturn)) cs_usage(const char *bin)
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{
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printf("Usage: %s [opts] <dst host> <dst port / service>\n", bin);
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printf("Options:\n"
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"\t\t-s Silent send() failures\n"
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"\t\t-S send() size\n"
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"\t\t-4/-6 Force IPv4 / IPv6 only\n"
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"\t\t-p prot Socket protocol\n"
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"\t\t (u = UDP (default); i = ICMP; r = RAW)\n"
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"\n"
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"\t\t-m val Set SO_MARK with given value\n"
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"\t\t-M val Set SO_MARK via setsockopt\n"
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"\t\t-d val Set SO_TXTIME with given delay (usec)\n"
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"\t\t-t Enable time stamp reporting\n"
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"\t\t-f val Set don't fragment via cmsg\n"
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"\t\t-F val Set don't fragment via setsockopt\n"
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"\t\t-c val Set TCLASS via cmsg\n"
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"\t\t-C val Set TCLASS via setsockopt\n"
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"\t\t-l val Set HOPLIMIT via cmsg\n"
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"\t\t-L val Set HOPLIMIT via setsockopt\n"
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"\t\t-H type Add an IPv6 header option\n"
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"\t\t (h = HOP; d = DST; r = RTDST)"
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"");
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exit(ERN_HELP);
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}
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static void cs_parse_args(int argc, char *argv[])
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{
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int o;
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while ((o = getopt(argc, argv, "46sS:p:m:M:d:tf:F:c:C:l:L:H:")) != -1) {
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switch (o) {
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case 's':
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opt.silent_send = true;
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break;
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case 'S':
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opt.size = atoi(optarg);
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break;
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case '4':
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opt.sock.family = AF_INET;
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break;
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case '6':
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opt.sock.family = AF_INET6;
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break;
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case 'p':
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if (*optarg == 'u' || *optarg == 'U') {
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opt.sock.proto = IPPROTO_UDP;
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} else if (*optarg == 'i' || *optarg == 'I') {
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opt.sock.proto = IPPROTO_ICMP;
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} else if (*optarg == 'r') {
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opt.sock.type = SOCK_RAW;
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} else {
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printf("Error: unknown protocol: %s\n", optarg);
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cs_usage(argv[0]);
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}
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break;
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case 'm':
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opt.mark.ena = true;
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opt.mark.val = atoi(optarg);
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break;
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case 'M':
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opt.sockopt.mark = atoi(optarg);
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break;
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case 'd':
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opt.txtime.ena = true;
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opt.txtime.delay = atoi(optarg);
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break;
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case 't':
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opt.ts.ena = true;
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break;
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case 'f':
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opt.v6.dontfrag.ena = true;
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opt.v6.dontfrag.val = atoi(optarg);
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break;
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case 'F':
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opt.sockopt.dontfrag = atoi(optarg);
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break;
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case 'c':
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opt.v6.tclass.ena = true;
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opt.v6.tclass.val = atoi(optarg);
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break;
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case 'C':
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opt.sockopt.tclass = atoi(optarg);
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break;
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case 'l':
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opt.v6.hlimit.ena = true;
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opt.v6.hlimit.val = atoi(optarg);
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break;
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case 'L':
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opt.sockopt.hlimit = atoi(optarg);
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break;
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case 'H':
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opt.v6.exthdr.ena = true;
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switch (optarg[0]) {
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case 'h':
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opt.v6.exthdr.val = IPV6_HOPOPTS;
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break;
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case 'd':
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opt.v6.exthdr.val = IPV6_DSTOPTS;
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break;
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case 'r':
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opt.v6.exthdr.val = IPV6_RTHDRDSTOPTS;
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break;
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default:
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printf("Error: hdr type: %s\n", optarg);
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break;
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}
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break;
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}
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}
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if (optind != argc - 2)
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cs_usage(argv[0]);
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opt.host = argv[optind];
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opt.service = argv[optind + 1];
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}
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static void memrnd(void *s, size_t n)
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{
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int *dword = s;
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char *byte;
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for (; n >= 4; n -= 4)
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*dword++ = rand();
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byte = (void *)dword;
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while (n--)
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*byte++ = rand();
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}
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static void
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ca_write_cmsg_u32(char *cbuf, size_t cbuf_sz, size_t *cmsg_len,
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int level, int optname, struct option_cmsg_u32 *uopt)
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{
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struct cmsghdr *cmsg;
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if (!uopt->ena)
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return;
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cmsg = (struct cmsghdr *)(cbuf + *cmsg_len);
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*cmsg_len += CMSG_SPACE(sizeof(__u32));
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if (cbuf_sz < *cmsg_len)
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error(ERN_CMSG_WR, EFAULT, "cmsg buffer too small");
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cmsg->cmsg_level = level;
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cmsg->cmsg_type = optname;
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cmsg->cmsg_len = CMSG_LEN(sizeof(__u32));
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*(__u32 *)CMSG_DATA(cmsg) = uopt->val;
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}
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static void
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cs_write_cmsg(int fd, struct msghdr *msg, char *cbuf, size_t cbuf_sz)
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{
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struct cmsghdr *cmsg;
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size_t cmsg_len;
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msg->msg_control = cbuf;
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cmsg_len = 0;
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ca_write_cmsg_u32(cbuf, cbuf_sz, &cmsg_len,
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SOL_SOCKET, SO_MARK, &opt.mark);
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ca_write_cmsg_u32(cbuf, cbuf_sz, &cmsg_len,
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SOL_IPV6, IPV6_DONTFRAG, &opt.v6.dontfrag);
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ca_write_cmsg_u32(cbuf, cbuf_sz, &cmsg_len,
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SOL_IPV6, IPV6_TCLASS, &opt.v6.tclass);
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ca_write_cmsg_u32(cbuf, cbuf_sz, &cmsg_len,
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SOL_IPV6, IPV6_HOPLIMIT, &opt.v6.hlimit);
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if (opt.txtime.ena) {
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struct sock_txtime so_txtime = {
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.clockid = CLOCK_MONOTONIC,
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};
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__u64 txtime;
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if (setsockopt(fd, SOL_SOCKET, SO_TXTIME,
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&so_txtime, sizeof(so_txtime)))
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error(ERN_SOCKOPT, errno, "setsockopt TXTIME");
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txtime = time_start_mono.tv_sec * (1000ULL * 1000 * 1000) +
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time_start_mono.tv_nsec +
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opt.txtime.delay * 1000;
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cmsg = (struct cmsghdr *)(cbuf + cmsg_len);
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cmsg_len += CMSG_SPACE(sizeof(txtime));
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if (cbuf_sz < cmsg_len)
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error(ERN_CMSG_WR, EFAULT, "cmsg buffer too small");
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cmsg->cmsg_level = SOL_SOCKET;
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cmsg->cmsg_type = SCM_TXTIME;
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cmsg->cmsg_len = CMSG_LEN(sizeof(txtime));
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memcpy(CMSG_DATA(cmsg), &txtime, sizeof(txtime));
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}
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if (opt.ts.ena) {
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__u32 val = SOF_TIMESTAMPING_SOFTWARE |
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SOF_TIMESTAMPING_OPT_TSONLY;
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if (setsockopt(fd, SOL_SOCKET, SO_TIMESTAMPING,
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&val, sizeof(val)))
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error(ERN_SOCKOPT, errno, "setsockopt TIMESTAMPING");
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cmsg = (struct cmsghdr *)(cbuf + cmsg_len);
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cmsg_len += CMSG_SPACE(sizeof(__u32));
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if (cbuf_sz < cmsg_len)
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error(ERN_CMSG_WR, EFAULT, "cmsg buffer too small");
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cmsg->cmsg_level = SOL_SOCKET;
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cmsg->cmsg_type = SO_TIMESTAMPING;
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cmsg->cmsg_len = CMSG_LEN(sizeof(__u32));
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*(__u32 *)CMSG_DATA(cmsg) = SOF_TIMESTAMPING_TX_SCHED |
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SOF_TIMESTAMPING_TX_SOFTWARE;
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}
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if (opt.v6.exthdr.ena) {
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cmsg = (struct cmsghdr *)(cbuf + cmsg_len);
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cmsg_len += CMSG_SPACE(8);
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if (cbuf_sz < cmsg_len)
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error(ERN_CMSG_WR, EFAULT, "cmsg buffer too small");
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cmsg->cmsg_level = SOL_IPV6;
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cmsg->cmsg_type = opt.v6.exthdr.val;
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cmsg->cmsg_len = CMSG_LEN(8);
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*(__u64 *)CMSG_DATA(cmsg) = 0;
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}
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if (cmsg_len)
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msg->msg_controllen = cmsg_len;
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else
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msg->msg_control = NULL;
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}
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static const char *cs_ts_info2str(unsigned int info)
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{
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static const char *names[] = {
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[SCM_TSTAMP_SND] = "SND",
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[SCM_TSTAMP_SCHED] = "SCHED",
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[SCM_TSTAMP_ACK] = "ACK",
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};
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if (info < ARRAY_SIZE(names))
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return names[info];
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return "unknown";
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}
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static void
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cs_read_cmsg(int fd, struct msghdr *msg, char *cbuf, size_t cbuf_sz)
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{
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struct sock_extended_err *see;
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struct scm_timestamping *ts;
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struct cmsghdr *cmsg;
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int i, err;
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if (!opt.ts.ena)
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return;
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msg->msg_control = cbuf;
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msg->msg_controllen = cbuf_sz;
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while (true) {
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ts = NULL;
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see = NULL;
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memset(cbuf, 0, cbuf_sz);
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err = recvmsg(fd, msg, MSG_ERRQUEUE);
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if (err < 0) {
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if (errno == EAGAIN)
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break;
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error(ERN_RECVERR, errno, "recvmsg ERRQ");
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}
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for (cmsg = CMSG_FIRSTHDR(msg); cmsg != NULL;
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cmsg = CMSG_NXTHDR(msg, cmsg)) {
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if (cmsg->cmsg_level == SOL_SOCKET &&
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cmsg->cmsg_type == SO_TIMESTAMPING_OLD) {
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if (cmsg->cmsg_len < sizeof(*ts))
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error(ERN_CMSG_RD, EINVAL, "TS cmsg");
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ts = (void *)CMSG_DATA(cmsg);
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}
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if ((cmsg->cmsg_level == SOL_IP &&
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cmsg->cmsg_type == IP_RECVERR) ||
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(cmsg->cmsg_level == SOL_IPV6 &&
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cmsg->cmsg_type == IPV6_RECVERR)) {
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|
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if (cmsg->cmsg_len < sizeof(*see))
|
||
|
|
error(ERN_CMSG_RD, EINVAL, "sock_err cmsg");
|
||
|
|
|
||
|
|
see = (void *)CMSG_DATA(cmsg);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!ts)
|
||
|
|
error(ERN_CMSG_RCV, ENOENT, "TS cmsg not found");
|
||
|
|
if (!see)
|
||
|
|
error(ERN_CMSG_RCV, ENOENT, "sock_err cmsg not found");
|
||
|
|
|
||
|
|
for (i = 0; i < 3; i++) {
|
||
|
|
unsigned long long rel_time;
|
||
|
|
|
||
|
|
if (!ts->ts[i].tv_sec && !ts->ts[i].tv_nsec)
|
||
|
|
continue;
|
||
|
|
|
||
|
|
rel_time = (ts->ts[i].tv_sec - time_start_real.tv_sec) *
|
||
|
|
(1000ULL * 1000) +
|
||
|
|
(ts->ts[i].tv_nsec - time_start_real.tv_nsec) /
|
||
|
|
1000;
|
||
|
|
printf(" %5s ts%d %lluus\n",
|
||
|
|
cs_ts_info2str(see->ee_info),
|
||
|
|
i, rel_time);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static void ca_set_sockopts(int fd)
|
||
|
|
{
|
||
|
|
if (opt.sockopt.mark &&
|
||
|
|
setsockopt(fd, SOL_SOCKET, SO_MARK,
|
||
|
|
&opt.sockopt.mark, sizeof(opt.sockopt.mark)))
|
||
|
|
error(ERN_SOCKOPT, errno, "setsockopt SO_MARK");
|
||
|
|
if (opt.sockopt.dontfrag &&
|
||
|
|
setsockopt(fd, SOL_IPV6, IPV6_DONTFRAG,
|
||
|
|
&opt.sockopt.dontfrag, sizeof(opt.sockopt.dontfrag)))
|
||
|
|
error(ERN_SOCKOPT, errno, "setsockopt IPV6_DONTFRAG");
|
||
|
|
if (opt.sockopt.tclass &&
|
||
|
|
setsockopt(fd, SOL_IPV6, IPV6_TCLASS,
|
||
|
|
&opt.sockopt.tclass, sizeof(opt.sockopt.tclass)))
|
||
|
|
error(ERN_SOCKOPT, errno, "setsockopt IPV6_TCLASS");
|
||
|
|
if (opt.sockopt.hlimit &&
|
||
|
|
setsockopt(fd, SOL_IPV6, IPV6_UNICAST_HOPS,
|
||
|
|
&opt.sockopt.hlimit, sizeof(opt.sockopt.hlimit)))
|
||
|
|
error(ERN_SOCKOPT, errno, "setsockopt IPV6_HOPLIMIT");
|
||
|
|
}
|
||
|
|
|
||
|
|
int main(int argc, char *argv[])
|
||
|
|
{
|
||
|
|
struct addrinfo hints, *ai;
|
||
|
|
struct iovec iov[1];
|
||
|
|
struct msghdr msg;
|
||
|
|
char cbuf[1024];
|
||
|
|
char *buf;
|
||
|
|
int err;
|
||
|
|
int fd;
|
||
|
|
|
||
|
|
cs_parse_args(argc, argv);
|
||
|
|
|
||
|
|
buf = malloc(opt.size);
|
||
|
|
memrnd(buf, opt.size);
|
||
|
|
|
||
|
|
memset(&hints, 0, sizeof(hints));
|
||
|
|
hints.ai_family = opt.sock.family;
|
||
|
|
|
||
|
|
ai = NULL;
|
||
|
|
err = getaddrinfo(opt.host, opt.service, &hints, &ai);
|
||
|
|
if (err) {
|
||
|
|
fprintf(stderr, "Can't resolve address [%s]:%s\n",
|
||
|
|
opt.host, opt.service);
|
||
|
|
return ERN_SOCK_CREATE;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (ai->ai_family == AF_INET6 && opt.sock.proto == IPPROTO_ICMP)
|
||
|
|
opt.sock.proto = IPPROTO_ICMPV6;
|
||
|
|
|
||
|
|
fd = socket(ai->ai_family, opt.sock.type, opt.sock.proto);
|
||
|
|
if (fd < 0) {
|
||
|
|
fprintf(stderr, "Can't open socket: %s\n", strerror(errno));
|
||
|
|
freeaddrinfo(ai);
|
||
|
|
return ERN_RESOLVE;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (opt.sock.proto == IPPROTO_ICMP) {
|
||
|
|
buf[0] = ICMP_ECHO;
|
||
|
|
buf[1] = 0;
|
||
|
|
} else if (opt.sock.proto == IPPROTO_ICMPV6) {
|
||
|
|
buf[0] = ICMPV6_ECHO_REQUEST;
|
||
|
|
buf[1] = 0;
|
||
|
|
} else if (opt.sock.type == SOCK_RAW) {
|
||
|
|
struct udphdr hdr = { 1, 2, htons(opt.size), 0 };
|
||
|
|
struct sockaddr_in6 *sin6 = (void *)ai->ai_addr;
|
||
|
|
|
||
|
|
memcpy(buf, &hdr, sizeof(hdr));
|
||
|
|
sin6->sin6_port = htons(opt.sock.proto);
|
||
|
|
}
|
||
|
|
|
||
|
|
ca_set_sockopts(fd);
|
||
|
|
|
||
|
|
if (clock_gettime(CLOCK_REALTIME, &time_start_real))
|
||
|
|
error(ERN_GETTIME, errno, "gettime REALTIME");
|
||
|
|
if (clock_gettime(CLOCK_MONOTONIC, &time_start_mono))
|
||
|
|
error(ERN_GETTIME, errno, "gettime MONOTONIC");
|
||
|
|
|
||
|
|
iov[0].iov_base = buf;
|
||
|
|
iov[0].iov_len = opt.size;
|
||
|
|
|
||
|
|
memset(&msg, 0, sizeof(msg));
|
||
|
|
msg.msg_name = ai->ai_addr;
|
||
|
|
msg.msg_namelen = ai->ai_addrlen;
|
||
|
|
msg.msg_iov = iov;
|
||
|
|
msg.msg_iovlen = 1;
|
||
|
|
|
||
|
|
cs_write_cmsg(fd, &msg, cbuf, sizeof(cbuf));
|
||
|
|
|
||
|
|
err = sendmsg(fd, &msg, 0);
|
||
|
|
if (err < 0) {
|
||
|
|
if (!opt.silent_send)
|
||
|
|
fprintf(stderr, "send failed: %s\n", strerror(errno));
|
||
|
|
err = ERN_SEND;
|
||
|
|
goto err_out;
|
||
|
|
} else if (err != (int)opt.size) {
|
||
|
|
fprintf(stderr, "short send\n");
|
||
|
|
err = ERN_SEND_SHORT;
|
||
|
|
goto err_out;
|
||
|
|
} else {
|
||
|
|
err = ERN_SUCCESS;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Make sure all timestamps have time to loop back */
|
||
|
|
usleep(opt.txtime.delay);
|
||
|
|
|
||
|
|
cs_read_cmsg(fd, &msg, cbuf, sizeof(cbuf));
|
||
|
|
|
||
|
|
err_out:
|
||
|
|
close(fd);
|
||
|
|
freeaddrinfo(ai);
|
||
|
|
return err;
|
||
|
|
}
|