path: root/tools/bpf/bpftool/prog.c

/*
 * Copyright (C) 2017 Netronome Systems, Inc.
 *
 * This software is dual licensed under the GNU General License Version 2,
 * June 1991 as shown in the file COPYING in the top-level directory of this
 * source tree or the BSD 2-Clause License provided below.  You have the
 * option to license this software under the complete terms of either license.
 *
 * The BSD 2-Clause License:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      1. Redistributions of source code must retain the above
 *         copyright notice, this list of conditions and the following
 *         disclaimer.
 *
 *      2. Redistributions in binary form must reproduce the above
 *         copyright notice, this list of conditions and the following
 *         disclaimer in the documentation and/or other materials
 *         provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

/* Author: Jakub Kicinski <kubakici@wp.pl> */

#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>

#include <bpf.h>
#include <libbpf.h>

#include "main.h"
#include "disasm.h"

static const char * const prog_type_name[] = {
	[BPF_PROG_TYPE_UNSPEC]		= "unspec",
	[BPF_PROG_TYPE_SOCKET_FILTER]	= "socket_filter",
	[BPF_PROG_TYPE_KPROBE]		= "kprobe",
	[BPF_PROG_TYPE_SCHED_CLS]	= "sched_cls",
	[BPF_PROG_TYPE_SCHED_ACT]	= "sched_act",
	[BPF_PROG_TYPE_TRACEPOINT]	= "tracepoint",
	[BPF_PROG_TYPE_XDP]		= "xdp",
	[BPF_PROG_TYPE_PERF_EVENT]	= "perf_event",
	[BPF_PROG_TYPE_CGROUP_SKB]	= "cgroup_skb",
	[BPF_PROG_TYPE_CGROUP_SOCK]	= "cgroup_sock",
	[BPF_PROG_TYPE_LWT_IN]		= "lwt_in",
	[BPF_PROG_TYPE_LWT_OUT]		= "lwt_out",
	[BPF_PROG_TYPE_LWT_XMIT]	= "lwt_xmit",
	[BPF_PROG_TYPE_SOCK_OPS]	= "sock_ops",
	[BPF_PROG_TYPE_SK_SKB]		= "sk_skb",
	[BPF_PROG_TYPE_CGROUP_DEVICE]	= "cgroup_device",
};

static void print_boot_time(__u64 nsecs, char *buf, unsigned int size)
{
	struct timespec real_time_ts, boot_time_ts;
	time_t wallclock_secs;
	struct tm load_tm;

	buf[--size] = '\0';

	if (clock_gettime(CLOCK_REALTIME, &real_time_ts) ||
	    clock_gettime(CLOCK_BOOTTIME, &boot_time_ts)) {
		perror("Can't read clocks");
		snprintf(buf, size, "%llu", nsecs / 1000000000);
		return;
	}

	wallclock_secs = (real_time_ts.tv_sec - boot_time_ts.tv_sec) +
		nsecs / 1000000000;

	if (!localtime_r(&wallclock_secs, &load_tm)) {
		snprintf(buf, size, "%llu", nsecs / 1000000000);
		return;
	}

	strftime(buf, size, "%b %d/%H:%M", &load_tm);
}

static int prog_fd_by_tag(unsigned char *tag)
{
	struct bpf_prog_info info = {};
	__u32 len = sizeof(info);
	unsigned int id = 0;
	int err;
	int fd;

	while (true) {
		err = bpf_prog_get_next_id(id, &id);
		if (err) {
			p_err("%s", strerror(errno));
			return -1;
		}

		fd = bpf_prog_get_fd_by_id(id);
		if (fd < 0) {
			p_err("can't get prog by id (%u): %s",
			      id, strerror(errno));
			return -1;
		}

		err = bpf_obj_get_info_by_fd(fd, &info, &len);
		if (err) {
			p_err("can't get prog info (%u): %s",
			      id, strerror(errno));
			close(fd);
			return -1;
		}

		if (!memcmp(tag, info.tag, BPF_TAG_SIZE))
			return fd;

		close(fd);
	}
}

int prog_parse_fd(int *argc, char ***argv)
{
	int fd;

	if (is_prefix(**argv, "id")) {
		unsigned int id;
		char *endptr;

		NEXT_ARGP();

		id = strtoul(**argv, &endptr, 0);
		if (*endptr) {
			p_err("can't parse %s as ID", **argv);
			return -1;
		}
		NEXT_ARGP();

		fd = bpf_prog_get_fd_by_id(id);
		if (fd < 0)
			p_err("get by id (%u): %s", id, strerror(errno));
		return fd;
	} else if (is_prefix(**argv, "tag")) {
		unsigned char tag[BPF_TAG_SIZE];

		NEXT_ARGP();

		if (sscanf(**argv, BPF_TAG_FMT, tag, tag + 1, tag + 2,
			   tag + 3, tag + 4, tag + 5, tag + 6, tag + 7)
		    != BPF_TAG_SIZE) {
			p_err("can't parse tag");
			return -1;
		}
		NEXT_ARGP();