libbpf-tools/tcprtt.c - platform/external/bcc - Gitiles

 // SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
 // Copyright (c) 2021 Wenbo Zhang
 //
 // Based on tcprtt(8) from BCC by zhenwei pi.
 // 06-Aug-2021   Wenbo Zhang   Created this.
 #define _DEFAULT_SOURCE
 #include <arpa/inet.h>
 #include <argp.h>
 #include <stdio.h>
 #include <signal.h>
 #include <unistd.h>
 #include <time.h>
 #include <bpf/libbpf.h>
 #include <bpf/bpf.h>
 #include "tcprtt.h"
 #include "tcprtt.skel.h"
 #include "trace_helpers.h"

 static struct env {
 	__u16 lport;
 	__u16 rport;
 	__u32 laddr;
 	__u32 raddr;
 	bool milliseconds;
 	time_t duration;
 	time_t interval;
 	bool timestamp;
 	bool laddr_hist;
 	bool raddr_hist;
 	bool extended;
 	bool verbose;
 } env = {
 	.interval = 99999999,
 };

 static volatile bool exiting;

 const char *argp_program_version = "tcprtt 0.1";
 const char *argp_program_bug_address =
 	"https://github.com/iovisor/bcc/tree/master/libbpf-tools";
 const char argp_program_doc[] =
 "Summarize TCP RTT as a histogram.\n"
 "\n"
 "USAGE: \n"
 "\n"
 "EXAMPLES:\n"
 "    tcprtt            # summarize TCP RTT\n"
 "    tcprtt -i 1 -d 10 # print 1 second summaries, 10 times\n"
 "    tcprtt -m -T      # summarize in millisecond, and timestamps\n"
 "    tcprtt -p         # filter for local port\n"
 "    tcprtt -P         # filter for remote port\n"
 "    tcprtt -a         # filter for local address\n"
 "    tcprtt -A         # filter for remote address\n"
 "    tcprtt -b         # show sockets histogram by local address\n"
 "    tcprtt -B         # show sockets histogram by remote address\n"
 "    tcprtt -e         # show extension summary(average)\n";

 static const struct argp_option opts[] = {
 	{ "interval", 'i', "INTERVAL", 0, "summary interval, seconds" },
 	{ "duration", 'd', "DURATION", 0, "total duration of trace, seconds" },
 	{ "timestamp", 'T', NULL, 0, "include timestamp on output" },
 	{ "millisecond", 'm', NULL, 0, "millisecond histogram" },
 	{ "lport", 'p', "LPORT", 0, "filter for local port" },
 	{ "rport", 'P', "RPORT", 0, "filter for remote port" },
 	{ "laddr", 'a', "LADDR", 0, "filter for local address" },
 	{ "raddr", 'A', "RADDR", 0, "filter for remote address" },
 	{ "byladdr", 'b', NULL, 0,
 	  "show sockets histogram by local address" },
 	{ "byraddr", 'B', NULL, 0,
 	  "show sockets histogram by remote address" },
 	{ "extension", 'e', NULL, 0, "show extension summary(average)" },
 	{ "verbose", 'v', NULL, 0, "Verbose debug output" },
 	{ NULL, 'h', NULL, OPTION_HIDDEN, "Show the full help" },
 	{},
 };

 static error_t parse_arg(int key, char *arg, struct argp_state *state)
 {
 	struct in_addr addr;

 	switch (key) {
 	case 'h':
 		argp_state_help(state, stderr, ARGP_HELP_STD_HELP);
 		break;
 	case 'v':
 		env.verbose = true;
 		break;
 	case 'i':
 		errno = 0;
 		env.interval = strtol(arg, NULL, 10);
 		if (errno || env.interval <= 0) {
 			fprintf(stderr, "invalid interval: %s\n", arg);
 			argp_usage(state);
 		}
 		break;
 	case 'd':
 		errno = 0;
 		env.duration = strtol(arg, NULL, 10);
 		if (errno || env.duration <= 0) {
 			fprintf(stderr, "invalid duration: %s\n", arg);
 			argp_usage(state);
 		}
 		break;
 	case 'T':
 		env.timestamp = true;
 		break;
 	case 'm':
 		env.milliseconds = true;
 		break;
 	case 'p':
 		errno = 0;
 		env.lport = strtoul(arg, NULL, 10);
 		if (errno) {
 			fprintf(stderr, "invalid lport: %s\n", arg);
 			argp_usage(state);
 		}
 		env.lport = htons(env.lport);
 		break;
 	case 'P':
 		errno = 0;
 		env.rport = strtoul(arg, NULL, 10);
 		if (errno) {
 			fprintf(stderr, "invalid rport: %s\n", arg);
 			argp_usage(state);
 		}
 		env.rport = htons(env.rport);
 		break;
 	case 'a':
 		if (inet_aton(arg, &addr) < 0) {
 			fprintf(stderr, "invalid local address: %s\n", arg);
 			argp_usage(state);
 		}
 		env.laddr = addr.s_addr;
 		break;
 	case 'A':
 		if (inet_aton(arg, &addr) < 0) {
 			fprintf(stderr, "invalid remote address: %s\n", arg);
 			argp_usage(state);
 		}
 		env.raddr = addr.s_addr;
 		break;
 	case 'b':
 		env.laddr_hist = true;
 		break;
 	case 'B':
 		env.raddr_hist = true;
 		break;
 	case 'e':
 		env.extended = true;
 		break;
 	default:
 		return ARGP_ERR_UNKNOWN;
 	}
 	return 0;
 }

 static int libbpf_print_fn(enum libbpf_print_level level, const char *format, va_list args)
 {
 	if (level == LIBBPF_DEBUG && !env.verbose)
 		return 0;
 	return vfprintf(stderr, format, args);
 }

 static void sig_handler(int sig)
 {
 	exiting = true;
 }

 static int print_map(struct bpf_map *map)
 {
 	const char *units = env.milliseconds ? "msecs" : "usecs";
 	__u64 lookup_key = -1, next_key;
 	int err, fd = bpf_map__fd(map);
 	struct hist hist;

 	while (!bpf_map_get_next_key(fd, &lookup_key, &next_key)) {
 		err = bpf_map_lookup_elem(fd, &next_key, &hist);
 		if (err < 0) {
 			fprintf(stderr, "failed to lookup infos: %d\n", err);
 			return -1;
 		}

 		struct in_addr addr = {.s_addr = next_key };
 		if (env.laddr_hist)
 			printf("Local Address = %s ", inet_ntoa(addr));
 		else if (env.raddr_hist)
 			printf("Remote Address = %s ", inet_ntoa(addr));
 		else
 			printf("All Addresses = ****** ");
 		if (env.extended)
 			printf("[AVG %llu]", hist.latency / hist.cnt);
 		printf("\n");
 		print_log2_hist(hist.slots, MAX_SLOTS, units);
 		lookup_key = next_key;
 	}

 	lookup_key = -1;
 	while (!bpf_map_get_next_key(fd, &lookup_key, &next_key)) {
 		err = bpf_map_delete_elem(fd, &next_key);
 		if (err < 0) {
 			fprintf(stderr, "failed to cleanup infos: %d\n", err);
 			return -1;
 		}
 		lookup_key = next_key;
 	}

 	return 0;
 }

 int main(int argc, char **argv)
 {
 	static const struct argp argp = {
 		.options = opts,
 		.parser = parse_arg,
 		.doc = argp_program_doc,
 	};
 	struct tcprtt_bpf *obj;
 	__u64 time_end = 0;
 	struct tm *tm;
 	char ts[32];
 	time_t t;
 	int err;

 	err = argp_parse(&argp, argc, argv, 0, NULL, NULL);
 	if (err)
 		return err;

 	libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
 	libbpf_set_print(libbpf_print_fn);

 	obj = tcprtt_bpf__open();
 	if (!obj) {
 		fprintf(stderr, "failed to open BPF object\n");
 		return 1;
 	}

 	obj->rodata->targ_laddr_hist = env.laddr_hist;
 	obj->rodata->targ_raddr_hist = env.raddr_hist;
 	obj->rodata->targ_show_ext = env.extended;
 	obj->rodata->targ_sport = env.lport;
 	obj->rodata->targ_dport = env.rport;
 	obj->rodata->targ_saddr = env.laddr;
 	obj->rodata->targ_daddr = env.raddr;
 	obj->rodata->targ_ms = env.milliseconds;

 	if (fentry_can_attach("tcp_rcv_established", NULL))
 		bpf_program__set_autoload(obj->progs.tcp_rcv_kprobe, false);
 	else
 		bpf_program__set_autoload(obj->progs.tcp_rcv, false);

 	err = tcprtt_bpf__load(obj);
 	if (err) {
 		fprintf(stderr, "failed to load BPF object: %d\n", err);
 		goto cleanup;
 	}

 	err = tcprtt_bpf__attach(obj);
 	if (err) {
 		fprintf(stderr, "failed to attach BPF programs: %d\n", err);
 		goto cleanup;
 	}

 	signal(SIGINT, sig_handler);

 	printf("Tracing TCP RTT");
 	if (env.duration)
 		printf(" for %ld secs.\n", env.duration);
 	else
 		printf("... Hit Ctrl-C to end.\n");

 	/* setup duration */
 	if (env.duration)
 		time_end = get_ktime_ns() + env.duration * NSEC_PER_SEC;

 	/* main: poll */
 	while (1) {
 		sleep(env.interval);
 		printf("\n");

 		if (env.timestamp) {
 			time(&t);
 			tm = localtime(&t);
 			strftime(ts, sizeof(ts), "%H:%M:%S", tm);
 			printf("%-8s\n", ts);
 		}

 		err = print_map(obj->maps.hists);
 		if (err)
 			break;

 		if (env.duration && get_ktime_ns() > time_end)
 			goto cleanup;

 		if (exiting)
 			break;
 	}

 cleanup:
 	tcprtt_bpf__destroy(obj);
 	return err != 0;
 }
	// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
	// Copyright (c) 2021 Wenbo Zhang
	//
	// Based on tcprtt(8) from BCC by zhenwei pi.
	// 06-Aug-2021 Wenbo Zhang Created this.
	#define _DEFAULT_SOURCE
	#include <arpa/inet.h>
	#include <argp.h>
	#include <stdio.h>
	#include <signal.h>
	#include <unistd.h>
	#include <time.h>
	#include <bpf/libbpf.h>
	#include <bpf/bpf.h>
	#include "tcprtt.h"
	#include "tcprtt.skel.h"
	#include "trace_helpers.h"

	static struct env {
	__u16 lport;
	__u16 rport;
	__u32 laddr;
	__u32 raddr;
	bool milliseconds;
	time_t duration;
	time_t interval;
	bool timestamp;
	bool laddr_hist;
	bool raddr_hist;
	bool extended;
	bool verbose;
	} env = {
	.interval = 99999999,
	};

	static volatile bool exiting;

	const char *argp_program_version = "tcprtt 0.1";
	const char *argp_program_bug_address =
	"https://github.com/iovisor/bcc/tree/master/libbpf-tools";
	const char argp_program_doc[] =
	"Summarize TCP RTT as a histogram.\n"
	"\n"
	"USAGE: \n"
	"\n"
	"EXAMPLES:\n"
	" tcprtt # summarize TCP RTT\n"
	" tcprtt -i 1 -d 10 # print 1 second summaries, 10 times\n"
	" tcprtt -m -T # summarize in millisecond, and timestamps\n"
	" tcprtt -p # filter for local port\n"
	" tcprtt -P # filter for remote port\n"
	" tcprtt -a # filter for local address\n"
	" tcprtt -A # filter for remote address\n"
	" tcprtt -b # show sockets histogram by local address\n"
	" tcprtt -B # show sockets histogram by remote address\n"
	" tcprtt -e # show extension summary(average)\n";

	static const struct argp_option opts[] = {
	{ "interval", 'i', "INTERVAL", 0, "summary interval, seconds" },
	{ "duration", 'd', "DURATION", 0, "total duration of trace, seconds" },
	{ "timestamp", 'T', NULL, 0, "include timestamp on output" },
	{ "millisecond", 'm', NULL, 0, "millisecond histogram" },
	{ "lport", 'p', "LPORT", 0, "filter for local port" },
	{ "rport", 'P', "RPORT", 0, "filter for remote port" },
	{ "laddr", 'a', "LADDR", 0, "filter for local address" },
	{ "raddr", 'A', "RADDR", 0, "filter for remote address" },
	{ "byladdr", 'b', NULL, 0,
	"show sockets histogram by local address" },
	{ "byraddr", 'B', NULL, 0,
	"show sockets histogram by remote address" },
	{ "extension", 'e', NULL, 0, "show extension summary(average)" },
	{ "verbose", 'v', NULL, 0, "Verbose debug output" },
	{ NULL, 'h', NULL, OPTION_HIDDEN, "Show the full help" },
	{},
	};

	static error_t parse_arg(int key, char arg, struct argp_state state)
	{
	struct in_addr addr;

	switch (key) {
	case 'h':
	argp_state_help(state, stderr, ARGP_HELP_STD_HELP);
	break;
	case 'v':
	env.verbose = true;
	break;
	case 'i':
	errno = 0;
	env.interval = strtol(arg, NULL, 10);
	if (errno \|\| env.interval <= 0) {
	fprintf(stderr, "invalid interval: %s\n", arg);
	argp_usage(state);
	}
	break;
	case 'd':
	errno = 0;
	env.duration = strtol(arg, NULL, 10);
	if (errno \|\| env.duration <= 0) {
	fprintf(stderr, "invalid duration: %s\n", arg);
	argp_usage(state);
	}
	break;
	case 'T':
	env.timestamp = true;
	break;
	case 'm':
	env.milliseconds = true;
	break;
	case 'p':
	errno = 0;
	env.lport = strtoul(arg, NULL, 10);
	if (errno) {
	fprintf(stderr, "invalid lport: %s\n", arg);
	argp_usage(state);
	}
	env.lport = htons(env.lport);
	break;
	case 'P':
	errno = 0;
	env.rport = strtoul(arg, NULL, 10);
	if (errno) {
	fprintf(stderr, "invalid rport: %s\n", arg);
	argp_usage(state);
	}
	env.rport = htons(env.rport);
	break;
	case 'a':
	if (inet_aton(arg, &addr) < 0) {
	fprintf(stderr, "invalid local address: %s\n", arg);
	argp_usage(state);
	}
	env.laddr = addr.s_addr;
	break;
	case 'A':
	if (inet_aton(arg, &addr) < 0) {
	fprintf(stderr, "invalid remote address: %s\n", arg);
	argp_usage(state);
	}
	env.raddr = addr.s_addr;
	break;
	case 'b':
	env.laddr_hist = true;
	break;
	case 'B':
	env.raddr_hist = true;
	break;
	case 'e':
	env.extended = true;
	break;
	default:
	return ARGP_ERR_UNKNOWN;
	}
	return 0;
	}

	static int libbpf_print_fn(enum libbpf_print_level level, const char *format, va_list args)
	{
	if (level == LIBBPF_DEBUG && !env.verbose)
	return 0;
	return vfprintf(stderr, format, args);
	}

	static void sig_handler(int sig)
	{
	exiting = true;
	}

	static int print_map(struct bpf_map *map)
	{
	const char *units = env.milliseconds ? "msecs" : "usecs";
	__u64 lookup_key = -1, next_key;
	int err, fd = bpf_map__fd(map);
	struct hist hist;

	while (!bpf_map_get_next_key(fd, &lookup_key, &next_key)) {
	err = bpf_map_lookup_elem(fd, &next_key, &hist);
	if (err < 0) {
	fprintf(stderr, "failed to lookup infos: %d\n", err);
	return -1;
	}

	struct in_addr addr = {.s_addr = next_key };
	if (env.laddr_hist)
	printf("Local Address = %s ", inet_ntoa(addr));
	else if (env.raddr_hist)
	printf("Remote Address = %s ", inet_ntoa(addr));
	else
	printf("All Addresses = ****** ");
	if (env.extended)
	printf("[AVG %llu]", hist.latency / hist.cnt);
	printf("\n");
	print_log2_hist(hist.slots, MAX_SLOTS, units);
	lookup_key = next_key;
	}

	lookup_key = -1;
	while (!bpf_map_get_next_key(fd, &lookup_key, &next_key)) {
	err = bpf_map_delete_elem(fd, &next_key);
	if (err < 0) {
	fprintf(stderr, "failed to cleanup infos: %d\n", err);
	return -1;
	}
	lookup_key = next_key;
	}

	return 0;
	}

	int main(int argc, char **argv)
	{
	static const struct argp argp = {
	.options = opts,
	.parser = parse_arg,
	.doc = argp_program_doc,
	};
	struct tcprtt_bpf *obj;
	__u64 time_end = 0;
	struct tm *tm;
	char ts[32];
	time_t t;
	int err;

	err = argp_parse(&argp, argc, argv, 0, NULL, NULL);
	if (err)
	return err;

	libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
	libbpf_set_print(libbpf_print_fn);

	obj = tcprtt_bpf__open();
	if (!obj) {
	fprintf(stderr, "failed to open BPF object\n");
	return 1;
	}

	obj->rodata->targ_laddr_hist = env.laddr_hist;
	obj->rodata->targ_raddr_hist = env.raddr_hist;
	obj->rodata->targ_show_ext = env.extended;
	obj->rodata->targ_sport = env.lport;
	obj->rodata->targ_dport = env.rport;
	obj->rodata->targ_saddr = env.laddr;
	obj->rodata->targ_daddr = env.raddr;
	obj->rodata->targ_ms = env.milliseconds;

	if (fentry_can_attach("tcp_rcv_established", NULL))
	bpf_program__set_autoload(obj->progs.tcp_rcv_kprobe, false);
	else
	bpf_program__set_autoload(obj->progs.tcp_rcv, false);

	err = tcprtt_bpf__load(obj);
	if (err) {
	fprintf(stderr, "failed to load BPF object: %d\n", err);
	goto cleanup;
	}

	err = tcprtt_bpf__attach(obj);
	if (err) {
	fprintf(stderr, "failed to attach BPF programs: %d\n", err);
	goto cleanup;
	}

	signal(SIGINT, sig_handler);

	printf("Tracing TCP RTT");
	if (env.duration)
	printf(" for %ld secs.\n", env.duration);
	else
	printf("... Hit Ctrl-C to end.\n");

	/* setup duration */
	if (env.duration)
	time_end = get_ktime_ns() + env.duration * NSEC_PER_SEC;

	/* main: poll */
	while (1) {
	sleep(env.interval);
	printf("\n");

	if (env.timestamp) {
	time(&t);
	tm = localtime(&t);
	strftime(ts, sizeof(ts), "%H:%M:%S", tm);
	printf("%-8s\n", ts);
	}

	err = print_map(obj->maps.hists);
	if (err)
	break;

	if (env.duration && get_ktime_ns() > time_end)
	goto cleanup;

	if (exiting)
	break;
	}

	cleanup:
	tcprtt_bpf__destroy(obj);
	return err != 0;
	}