libbpf-tools/tcpconnlat.c - platform/external/bcc - Git at Google

 // SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
 // Copyright (c) 2020 Wenbo Zhang
 //
 // Based on tcpconnlat(8) from BCC by Brendan Gregg.
 // 11-Jul-2020   Wenbo Zhang   Created this.
 #include <argp.h>
 #include <arpa/inet.h>
 #include <signal.h>
 #include <stdio.h>
 #include <unistd.h>
 #include <time.h>
 #include <bpf/libbpf.h>
 #include <bpf/bpf.h>
 #include "tcpconnlat.h"
 #include "tcpconnlat.skel.h"
 #include "trace_helpers.h"

 #define PERF_BUFFER_PAGES	16
 #define PERF_POLL_TIMEOUT_MS	100

 static volatile sig_atomic_t exiting = 0;

 static struct env {
 	__u64 min_us;
 	pid_t pid;
 	bool timestamp;
 	bool lport;
 	bool verbose;
 } env;

 const char *argp_program_version = "tcpconnlat 0.1";
 const char *argp_program_bug_address =
 	"https://github.com/iovisor/bcc/tree/master/libbpf-tools";
 const char argp_program_doc[] =
 "\nTrace TCP connects and show connection latency.\n"
 "\n"
 "USAGE: tcpconnlat [--help] [-t] [-p PID] [-L]\n"
 "\n"
 "EXAMPLES:\n"
 "    tcpconnlat              # summarize on-CPU time as a histogram\n"
 "    tcpconnlat 1            # trace connection latency slower than 1 ms\n"
 "    tcpconnlat 0.1          # trace connection latency slower than 100 us\n"
 "    tcpconnlat -t           # 1s summaries, milliseconds, and timestamps\n"
 "    tcpconnlat -p 185       # trace PID 185 only\n"
 "    tcpconnlat -L           # include LPORT while printing outputs\n";

 static const struct argp_option opts[] = {
 	{ "timestamp", 't', NULL, 0, "Include timestamp on output" },
 	{ "pid", 'p', "PID", 0, "Trace this PID only" },
 	{ "lport", 'L', NULL, 0, "Include LPORT on output" },
 	{ "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)
 {
 	static int pos_args;

 	switch (key) {
 	case 'h':
 		argp_state_help(state, stderr, ARGP_HELP_STD_HELP);
 		break;
 	case 'v':
 		env.verbose = true;
 		break;
 	case 'p':
 		errno = 0;
 		env.pid = strtol(arg, NULL, 10);
 		if (errno) {
 			fprintf(stderr, "invalid PID: %s\n", arg);
 			argp_usage(state);
 		}
 		break;
 	case 't':
 		env.timestamp = true;
 		break;
 	case 'L':
 		env.lport = true;
 		break;
 	case ARGP_KEY_ARG:
 		if (pos_args++) {
 			fprintf(stderr,
 				"Unrecognized positional argument: %s\n", arg);
 			argp_usage(state);
 		}
 		errno = 0;
 		env.min_us = strtod(arg, NULL) * 1000;
 		if (errno || env.min_us <= 0) {
 			fprintf(stderr, "Invalid delay (in us): %s\n", arg);
 			argp_usage(state);
 		}
 		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_int(int signo)
 {
 	exiting = 1;
 }

 void handle_event(void *ctx, int cpu, void *data, __u32 data_sz)
 {
 	const struct event *e = data;
 	char src[INET6_ADDRSTRLEN];
 	char dst[INET6_ADDRSTRLEN];
 	union {
 		struct in_addr  x4;
 		struct in6_addr x6;
 	} s, d;
 	static __u64 start_ts;

 	if (env.timestamp) {
 		if (start_ts == 0)
 			start_ts = e->ts_us;
 		printf("%-9.3f ", (e->ts_us - start_ts) / 1000000.0);
 	}
 	if (e->af == AF_INET) {
 		s.x4.s_addr = e->saddr_v4;
 		d.x4.s_addr = e->daddr_v4;
 	} else if (e->af == AF_INET6) {
 		memcpy(&s.x6.s6_addr, e->saddr_v6, sizeof(s.x6.s6_addr));
 		memcpy(&d.x6.s6_addr, e->daddr_v6, sizeof(d.x6.s6_addr));
 	} else {
 		fprintf(stderr, "broken event: event->af=%d", e->af);
 		return;
 	}

 	if (env.lport) {
 		printf("%-6d %-12.12s %-2d %-16s %-6d %-16s %-5d %.2f\n", e->tgid, e->comm,
 			e->af == AF_INET ? 4 : 6, inet_ntop(e->af, &s, src, sizeof(src)), e->lport,
 			inet_ntop(e->af, &d, dst, sizeof(dst)), ntohs(e->dport),
 			e->delta_us / 1000.0);
 	} else {
 		printf("%-6d %-12.12s %-2d %-16s %-16s %-5d %.2f\n", e->tgid, e->comm,
 			e->af == AF_INET ? 4 : 6, inet_ntop(e->af, &s, src, sizeof(src)),
 			inet_ntop(e->af, &d, dst, sizeof(dst)), ntohs(e->dport),
 			e->delta_us / 1000.0);
 	}
 }

 void handle_lost_events(void *ctx, int cpu, __u64 lost_cnt)
 {
 	fprintf(stderr, "lost %llu events on CPU #%d\n", lost_cnt, cpu);
 }

 int main(int argc, char **argv)
 {
 	static const struct argp argp = {
 		.options = opts,
 		.parser = parse_arg,
 		.doc = argp_program_doc,
 	};
 	struct perf_buffer *pb = NULL;
 	struct tcpconnlat_bpf *obj;
 	int err;

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

 	libbpf_set_print(libbpf_print_fn);

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

 	/* initialize global data (filtering options) */
 	obj->rodata->targ_min_us = env.min_us;
 	obj->rodata->targ_tgid = env.pid;

 	if (fentry_can_attach("tcp_v4_connect", NULL)) {
 		bpf_program__set_attach_target(obj->progs.fentry_tcp_v4_connect, 0, "tcp_v4_connect");
 		bpf_program__set_attach_target(obj->progs.fentry_tcp_v6_connect, 0, "tcp_v6_connect");
 		bpf_program__set_attach_target(obj->progs.fentry_tcp_rcv_state_process, 0, "tcp_rcv_state_process");
 		bpf_program__set_autoload(obj->progs.tcp_v4_connect, false);
 		bpf_program__set_autoload(obj->progs.tcp_v6_connect, false);
 		bpf_program__set_autoload(obj->progs.tcp_rcv_state_process, false);
 	} else {
 		bpf_program__set_autoload(obj->progs.fentry_tcp_v4_connect, false);
 		bpf_program__set_autoload(obj->progs.fentry_tcp_v6_connect, false);
 		bpf_program__set_autoload(obj->progs.fentry_tcp_rcv_state_process, false);
 	}

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

 	err = tcpconnlat_bpf__attach(obj);
 	if (err) {
 		goto cleanup;
 	}

 	pb = perf_buffer__new(bpf_map__fd(obj->maps.events), PERF_BUFFER_PAGES,
 			      handle_event, handle_lost_events, NULL, NULL);
 	if (!pb) {
 		fprintf(stderr, "failed to open perf buffer: %d\n", errno);
 		goto cleanup;
 	}

 	/* print header */
 	if (env.timestamp)
 		printf("%-9s ", ("TIME(s)"));
 	if (env.lport) {
 		printf("%-6s %-12s %-2s %-16s %-6s %-16s %-5s %s\n",
 			"PID", "COMM", "IP", "SADDR", "LPORT", "DADDR", "DPORT", "LAT(ms)");
 	} else {
 		printf("%-6s %-12s %-2s %-16s %-16s %-5s %s\n",
 			"PID", "COMM", "IP", "SADDR", "DADDR", "DPORT", "LAT(ms)");
 	}

 	if (signal(SIGINT, sig_int) == SIG_ERR) {
 		fprintf(stderr, "can't set signal handler: %s\n", strerror(errno));
 		err = 1;
 		goto cleanup;
 	}

 	/* main: poll */
 	while (!exiting) {
 		err = perf_buffer__poll(pb, PERF_POLL_TIMEOUT_MS);
 		if (err < 0 && err != -EINTR) {
 			fprintf(stderr, "error polling perf buffer: %s\n", strerror(-err));
 			goto cleanup;
 		}
 		/* reset err to return 0 if exiting */
 		err = 0;
 	}

 cleanup:
 	perf_buffer__free(pb);
 	tcpconnlat_bpf__destroy(obj);

 	return err != 0;
 }
	// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
	// Copyright (c) 2020 Wenbo Zhang
	//
	// Based on tcpconnlat(8) from BCC by Brendan Gregg.
	// 11-Jul-2020 Wenbo Zhang Created this.
	#include <argp.h>
	#include <arpa/inet.h>
	#include <signal.h>
	#include <stdio.h>
	#include <unistd.h>
	#include <time.h>
	#include <bpf/libbpf.h>
	#include <bpf/bpf.h>
	#include "tcpconnlat.h"
	#include "tcpconnlat.skel.h"
	#include "trace_helpers.h"

	#define PERF_BUFFER_PAGES 16
	#define PERF_POLL_TIMEOUT_MS 100

	static volatile sig_atomic_t exiting = 0;

	static struct env {
	__u64 min_us;
	pid_t pid;
	bool timestamp;
	bool lport;
	bool verbose;
	} env;

	const char *argp_program_version = "tcpconnlat 0.1";
	const char *argp_program_bug_address =
	"https://github.com/iovisor/bcc/tree/master/libbpf-tools";
	const char argp_program_doc[] =
	"\nTrace TCP connects and show connection latency.\n"
	"\n"
	"USAGE: tcpconnlat [--help] [-t] [-p PID] [-L]\n"
	"\n"
	"EXAMPLES:\n"
	" tcpconnlat # summarize on-CPU time as a histogram\n"
	" tcpconnlat 1 # trace connection latency slower than 1 ms\n"
	" tcpconnlat 0.1 # trace connection latency slower than 100 us\n"
	" tcpconnlat -t # 1s summaries, milliseconds, and timestamps\n"
	" tcpconnlat -p 185 # trace PID 185 only\n"
	" tcpconnlat -L # include LPORT while printing outputs\n";

	static const struct argp_option opts[] = {
	{ "timestamp", 't', NULL, 0, "Include timestamp on output" },
	{ "pid", 'p', "PID", 0, "Trace this PID only" },
	{ "lport", 'L', NULL, 0, "Include LPORT on output" },
	{ "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)
	{
	static int pos_args;

	switch (key) {
	case 'h':
	argp_state_help(state, stderr, ARGP_HELP_STD_HELP);
	break;
	case 'v':
	env.verbose = true;
	break;
	case 'p':
	errno = 0;
	env.pid = strtol(arg, NULL, 10);
	if (errno) {
	fprintf(stderr, "invalid PID: %s\n", arg);
	argp_usage(state);
	}
	break;
	case 't':
	env.timestamp = true;
	break;
	case 'L':
	env.lport = true;
	break;
	case ARGP_KEY_ARG:
	if (pos_args++) {
	fprintf(stderr,
	"Unrecognized positional argument: %s\n", arg);
	argp_usage(state);
	}
	errno = 0;
	env.min_us = strtod(arg, NULL) * 1000;
	if (errno \|\| env.min_us <= 0) {
	fprintf(stderr, "Invalid delay (in us): %s\n", arg);
	argp_usage(state);
	}
	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_int(int signo)
	{
	exiting = 1;
	}

	void handle_event(void ctx, int cpu, void data, __u32 data_sz)
	{
	const struct event *e = data;
	char src[INET6_ADDRSTRLEN];
	char dst[INET6_ADDRSTRLEN];
	union {
	struct in_addr x4;
	struct in6_addr x6;
	} s, d;
	static __u64 start_ts;

	if (env.timestamp) {
	if (start_ts == 0)
	start_ts = e->ts_us;
	printf("%-9.3f ", (e->ts_us - start_ts) / 1000000.0);
	}
	if (e->af == AF_INET) {
	s.x4.s_addr = e->saddr_v4;
	d.x4.s_addr = e->daddr_v4;
	} else if (e->af == AF_INET6) {
	memcpy(&s.x6.s6_addr, e->saddr_v6, sizeof(s.x6.s6_addr));
	memcpy(&d.x6.s6_addr, e->daddr_v6, sizeof(d.x6.s6_addr));
	} else {
	fprintf(stderr, "broken event: event->af=%d", e->af);
	return;
	}

	if (env.lport) {
	printf("%-6d %-12.12s %-2d %-16s %-6d %-16s %-5d %.2f\n", e->tgid, e->comm,
	e->af == AF_INET ? 4 : 6, inet_ntop(e->af, &s, src, sizeof(src)), e->lport,
	inet_ntop(e->af, &d, dst, sizeof(dst)), ntohs(e->dport),
	e->delta_us / 1000.0);
	} else {
	printf("%-6d %-12.12s %-2d %-16s %-16s %-5d %.2f\n", e->tgid, e->comm,
	e->af == AF_INET ? 4 : 6, inet_ntop(e->af, &s, src, sizeof(src)),
	inet_ntop(e->af, &d, dst, sizeof(dst)), ntohs(e->dport),
	e->delta_us / 1000.0);
	}
	}

	void handle_lost_events(void *ctx, int cpu, __u64 lost_cnt)
	{
	fprintf(stderr, "lost %llu events on CPU #%d\n", lost_cnt, cpu);
	}

	int main(int argc, char **argv)
	{
	static const struct argp argp = {
	.options = opts,
	.parser = parse_arg,
	.doc = argp_program_doc,
	};
	struct perf_buffer *pb = NULL;
	struct tcpconnlat_bpf *obj;
	int err;

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

	libbpf_set_print(libbpf_print_fn);

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

	/* initialize global data (filtering options) */
	obj->rodata->targ_min_us = env.min_us;
	obj->rodata->targ_tgid = env.pid;

	if (fentry_can_attach("tcp_v4_connect", NULL)) {
	bpf_program__set_attach_target(obj->progs.fentry_tcp_v4_connect, 0, "tcp_v4_connect");
	bpf_program__set_attach_target(obj->progs.fentry_tcp_v6_connect, 0, "tcp_v6_connect");
	bpf_program__set_attach_target(obj->progs.fentry_tcp_rcv_state_process, 0, "tcp_rcv_state_process");
	bpf_program__set_autoload(obj->progs.tcp_v4_connect, false);
	bpf_program__set_autoload(obj->progs.tcp_v6_connect, false);
	bpf_program__set_autoload(obj->progs.tcp_rcv_state_process, false);
	} else {
	bpf_program__set_autoload(obj->progs.fentry_tcp_v4_connect, false);
	bpf_program__set_autoload(obj->progs.fentry_tcp_v6_connect, false);
	bpf_program__set_autoload(obj->progs.fentry_tcp_rcv_state_process, false);
	}

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

	err = tcpconnlat_bpf__attach(obj);
	if (err) {
	goto cleanup;
	}

	pb = perf_buffer__new(bpf_map__fd(obj->maps.events), PERF_BUFFER_PAGES,
	handle_event, handle_lost_events, NULL, NULL);
	if (!pb) {
	fprintf(stderr, "failed to open perf buffer: %d\n", errno);
	goto cleanup;
	}

	/* print header */
	if (env.timestamp)
	printf("%-9s ", ("TIME(s)"));
	if (env.lport) {
	printf("%-6s %-12s %-2s %-16s %-6s %-16s %-5s %s\n",
	"PID", "COMM", "IP", "SADDR", "LPORT", "DADDR", "DPORT", "LAT(ms)");
	} else {
	printf("%-6s %-12s %-2s %-16s %-16s %-5s %s\n",
	"PID", "COMM", "IP", "SADDR", "DADDR", "DPORT", "LAT(ms)");
	}

	if (signal(SIGINT, sig_int) == SIG_ERR) {
	fprintf(stderr, "can't set signal handler: %s\n", strerror(errno));
	err = 1;
	goto cleanup;
	}

	/* main: poll */
	while (!exiting) {
	err = perf_buffer__poll(pb, PERF_POLL_TIMEOUT_MS);
	if (err < 0 && err != -EINTR) {
	fprintf(stderr, "error polling perf buffer: %s\n", strerror(-err));
	goto cleanup;
	}
	/* reset err to return 0 if exiting */
	err = 0;
	}

	cleanup:
	perf_buffer__free(pb);
	tcpconnlat_bpf__destroy(obj);

	return err != 0;
	}