302 lines
7.1 KiB
C
302 lines
7.1 KiB
C
// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
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// Copyright (c) 2021 Wenbo Zhang
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//
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// Based on tcprtt(8) from BCC by zhenwei pi.
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// 06-Aug-2021 Wenbo Zhang Created this.
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#define _DEFAULT_SOURCE
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#include <arpa/inet.h>
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#include <argp.h>
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#include <stdio.h>
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#include <signal.h>
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#include <unistd.h>
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#include <time.h>
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#include <bpf/libbpf.h>
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#include <bpf/bpf.h>
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#include "tcprtt.h"
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#include "tcprtt.skel.h"
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#include "trace_helpers.h"
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static struct env {
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__u16 lport;
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__u16 rport;
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__u32 laddr;
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__u32 raddr;
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bool milliseconds;
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time_t duration;
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time_t interval;
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bool timestamp;
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bool laddr_hist;
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bool raddr_hist;
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bool extended;
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bool verbose;
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} env = {
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.interval = 99999999,
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};
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static volatile bool exiting;
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const char *argp_program_version = "tcprtt 0.1";
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const char *argp_program_bug_address =
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"https://github.com/iovisor/bcc/tree/master/libbpf-tools";
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const char argp_program_doc[] =
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"Summarize TCP RTT as a histogram.\n"
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"\n"
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"USAGE: \n"
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"\n"
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"EXAMPLES:\n"
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" tcprtt # summarize TCP RTT\n"
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" tcprtt -i 1 -d 10 # print 1 second summaries, 10 times\n"
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" tcprtt -m -T # summarize in millisecond, and timestamps\n"
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" tcprtt -p # filter for local port\n"
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" tcprtt -P # filter for remote port\n"
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" tcprtt -a # filter for local address\n"
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" tcprtt -A # filter for remote address\n"
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" tcprtt -b # show sockets histogram by local address\n"
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" tcprtt -B # show sockets histogram by remote address\n"
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" tcprtt -e # show extension summary(average)\n";
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static const struct argp_option opts[] = {
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{ "interval", 'i', "INTERVAL", 0, "summary interval, seconds" },
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{ "duration", 'd', "DURATION", 0, "total duration of trace, seconds" },
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{ "timestamp", 'T', NULL, 0, "include timestamp on output" },
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{ "millisecond", 'm', NULL, 0, "millisecond histogram" },
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{ "lport", 'p', "LPORT", 0, "filter for local port" },
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{ "rport", 'P', "RPORT", 0, "filter for remote port" },
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{ "laddr", 'a', "LADDR", 0, "filter for local address" },
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{ "raddr", 'A', "RADDR", 0, "filter for remote address" },
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{ "byladdr", 'b', NULL, 0,
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"show sockets histogram by local address" },
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{ "byraddr", 'B', NULL, 0,
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"show sockets histogram by remote address" },
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{ "extension", 'e', NULL, 0, "show extension summary(average)" },
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{ "verbose", 'v', NULL, 0, "Verbose debug output" },
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{ NULL, 'h', NULL, OPTION_HIDDEN, "Show the full help" },
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{},
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};
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static error_t parse_arg(int key, char *arg, struct argp_state *state)
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{
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struct in_addr addr;
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switch (key) {
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case 'h':
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argp_state_help(state, stderr, ARGP_HELP_STD_HELP);
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break;
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case 'v':
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env.verbose = true;
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break;
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case 'i':
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errno = 0;
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env.interval = strtol(arg, NULL, 10);
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if (errno || env.interval <= 0) {
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fprintf(stderr, "invalid interval: %s\n", arg);
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argp_usage(state);
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}
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break;
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case 'd':
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errno = 0;
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env.duration = strtol(arg, NULL, 10);
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if (errno || env.duration <= 0) {
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fprintf(stderr, "invalid duration: %s\n", arg);
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argp_usage(state);
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}
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break;
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case 'T':
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env.timestamp = true;
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break;
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case 'm':
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env.milliseconds = true;
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break;
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case 'p':
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errno = 0;
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env.lport = strtoul(arg, NULL, 10);
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if (errno) {
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fprintf(stderr, "invalid lport: %s\n", arg);
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argp_usage(state);
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}
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env.lport = htons(env.lport);
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break;
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case 'P':
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errno = 0;
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env.rport = strtoul(arg, NULL, 10);
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if (errno) {
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fprintf(stderr, "invalid rport: %s\n", arg);
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argp_usage(state);
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}
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env.rport = htons(env.rport);
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break;
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case 'a':
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if (inet_aton(arg, &addr) < 0) {
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fprintf(stderr, "invalid local address: %s\n", arg);
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argp_usage(state);
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}
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env.laddr = addr.s_addr;
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break;
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case 'A':
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if (inet_aton(arg, &addr) < 0) {
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fprintf(stderr, "invalid remote address: %s\n", arg);
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argp_usage(state);
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}
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env.raddr = addr.s_addr;
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break;
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case 'b':
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env.laddr_hist = true;
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break;
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case 'B':
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env.raddr_hist = true;
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break;
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case 'e':
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env.extended = true;
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break;
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default:
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return ARGP_ERR_UNKNOWN;
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}
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return 0;
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}
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static int libbpf_print_fn(enum libbpf_print_level level, const char *format, va_list args)
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{
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if (level == LIBBPF_DEBUG && !env.verbose)
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return 0;
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return vfprintf(stderr, format, args);
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}
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static void sig_handler(int sig)
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{
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exiting = true;
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}
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static int print_map(struct bpf_map *map)
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{
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const char *units = env.milliseconds ? "msecs" : "usecs";
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__u64 lookup_key = -1, next_key;
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int err, fd = bpf_map__fd(map);
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struct hist hist;
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while (!bpf_map_get_next_key(fd, &lookup_key, &next_key)) {
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err = bpf_map_lookup_elem(fd, &next_key, &hist);
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if (err < 0) {
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fprintf(stderr, "failed to lookup infos: %d\n", err);
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return -1;
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}
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struct in_addr addr = {.s_addr = next_key };
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if (env.laddr_hist)
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printf("Local Address = %s ", inet_ntoa(addr));
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else if (env.raddr_hist)
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printf("Remote Address = %s ", inet_ntoa(addr));
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else
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printf("All Addresses = ****** ");
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if (env.extended)
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printf("[AVG %llu]", hist.latency / hist.cnt);
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printf("\n");
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print_log2_hist(hist.slots, MAX_SLOTS, units);
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lookup_key = next_key;
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}
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lookup_key = -1;
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while (!bpf_map_get_next_key(fd, &lookup_key, &next_key)) {
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err = bpf_map_delete_elem(fd, &next_key);
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if (err < 0) {
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fprintf(stderr, "failed to cleanup infos: %d\n", err);
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return -1;
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}
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lookup_key = next_key;
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}
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return 0;
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}
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int main(int argc, char **argv)
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{
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static const struct argp argp = {
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.options = opts,
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.parser = parse_arg,
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.doc = argp_program_doc,
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};
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struct tcprtt_bpf *obj;
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__u64 time_end = 0;
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struct tm *tm;
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char ts[32];
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time_t t;
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int err;
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err = argp_parse(&argp, argc, argv, 0, NULL, NULL);
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if (err)
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return err;
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libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
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libbpf_set_print(libbpf_print_fn);
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obj = tcprtt_bpf__open();
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if (!obj) {
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fprintf(stderr, "failed to open BPF object\n");
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return 1;
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}
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obj->rodata->targ_laddr_hist = env.laddr_hist;
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obj->rodata->targ_raddr_hist = env.raddr_hist;
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obj->rodata->targ_show_ext = env.extended;
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obj->rodata->targ_sport = env.lport;
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obj->rodata->targ_dport = env.rport;
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obj->rodata->targ_saddr = env.laddr;
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obj->rodata->targ_daddr = env.raddr;
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obj->rodata->targ_ms = env.milliseconds;
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if (fentry_can_attach("tcp_rcv_established", NULL))
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bpf_program__set_autoload(obj->progs.tcp_rcv_kprobe, false);
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else
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bpf_program__set_autoload(obj->progs.tcp_rcv, false);
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err = tcprtt_bpf__load(obj);
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if (err) {
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fprintf(stderr, "failed to load BPF object: %d\n", err);
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goto cleanup;
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}
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err = tcprtt_bpf__attach(obj);
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if (err) {
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fprintf(stderr, "failed to attach BPF programs: %d\n", err);
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goto cleanup;
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}
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signal(SIGINT, sig_handler);
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printf("Tracing TCP RTT");
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if (env.duration)
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printf(" for %ld secs.\n", env.duration);
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else
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printf("... Hit Ctrl-C to end.\n");
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/* setup duration */
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if (env.duration)
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time_end = get_ktime_ns() + env.duration * NSEC_PER_SEC;
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/* main: poll */
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while (1) {
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sleep(env.interval);
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printf("\n");
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if (env.timestamp) {
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time(&t);
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tm = localtime(&t);
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strftime(ts, sizeof(ts), "%H:%M:%S", tm);
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printf("%-8s\n", ts);
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}
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err = print_map(obj->maps.hists);
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if (err)
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break;
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if (env.duration && get_ktime_ns() > time_end)
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goto cleanup;
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if (exiting)
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break;
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}
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cleanup:
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tcprtt_bpf__destroy(obj);
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return err != 0;
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}
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