[mirror_ubuntu-jammy-kernel.git] / samples / bpf / xdp_sample_pkts_user.c

// SPDX-License-Identifier: GPL-2.0
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <linux/perf_event.h>
#include <linux/bpf.h>
#include <net/if.h>
#include <errno.h>
#include <assert.h>
#include <sys/sysinfo.h>
#include <sys/ioctl.h>
#include <signal.h>
#include <libbpf.h>
#include <bpf/bpf.h>
#include <sys/resource.h>
#include <libgen.h>
#include <linux/if_link.h>

#include "perf-sys.h"

#define MAX_CPUS 128
static int if_idx;
static char *if_name;
static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
static __u32 prog_id;
static struct perf_buffer *pb = NULL;

static int do_attach(int idx, int fd, const char *name)
{
	struct bpf_prog_info info = {};
	__u32 info_len = sizeof(info);
	int err;

	err = bpf_set_link_xdp_fd(idx, fd, xdp_flags);
	if (err < 0) {
		printf("ERROR: failed to attach program to %s\n", name);
		return err;
	}

	err = bpf_obj_get_info_by_fd(fd, &info, &info_len);
	if (err) {
		printf("can't get prog info - %s\n", strerror(errno));
		return err;
	}
	prog_id = info.id;

	return err;
}

static int do_detach(int idx, const char *name)
{
	__u32 curr_prog_id = 0;
	int err = 0;

	err = bpf_get_link_xdp_id(idx, &curr_prog_id, 0);
	if (err) {
		printf("bpf_get_link_xdp_id failed\n");
		return err;
	}
	if (prog_id == curr_prog_id) {
		err = bpf_set_link_xdp_fd(idx, -1, 0);
		if (err < 0)
			printf("ERROR: failed to detach prog from %s\n", name);
	} else if (!curr_prog_id) {
		printf("couldn't find a prog id on a %s\n", name);
	} else {
		printf("program on interface changed, not removing\n");
	}

	return err;
}

#define SAMPLE_SIZE 64

static void print_bpf_output(void *ctx, int cpu, void *data, __u32 size)
{
	struct {
		__u16 cookie;
		__u16 pkt_len;
		__u8  pkt_data[SAMPLE_SIZE];
	} __packed *e = data;
	int i;

	if (e->cookie != 0xdead) {
		printf("BUG cookie %x sized %d\n", e->cookie, size);
		return;
	}

	printf("Pkt len: %-5d bytes. Ethernet hdr: ", e->pkt_len);
	for (i = 0; i < 14 && i < e->pkt_len; i++)
		printf("%02x ", e->pkt_data[i]);
	printf("\n");
}

static void sig_handler(int signo)
{
	do_detach(if_idx, if_name);
	perf_buffer__free(pb);
	exit(0);
}

static void usage(const char *prog)
{
	fprintf(stderr,
		"%s: %s [OPTS] <ifname|ifindex>\n\n"
		"OPTS:\n"
		"    -F    force loading prog\n",
		__func__, prog);
}

int main(int argc, char **argv)
{
	struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
	struct bpf_prog_load_attr prog_load_attr = {
		.prog_type	= BPF_PROG_TYPE_XDP,
	};
	struct perf_buffer_opts pb_opts = {};
	const char *optstr = "F";
	int prog_fd, map_fd, opt;
	struct bpf_object *obj;
	struct bpf_map *map;
	char filename[256];
	int ret, err;

	while ((opt = getopt(argc, argv, optstr)) != -1) {
		switch (opt) {
		case 'F':
			xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
			break;
		default:
			usage(basename(argv[0]));
			return 1;
		}
	}

	if (optind == argc) {
		usage(basename(argv[0]));
		return 1;
	}

	if (setrlimit(RLIMIT_MEMLOCK, &r)) {
		perror("setrlimit(RLIMIT_MEMLOCK)");
		return 1;
	}

	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
	prog_load_attr.file = filename;

	if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd))
		return 1;

	if (!prog_fd) {
		printf("load_bpf_file: %s\n", strerror(errno));
		return 1;
	}

	map = bpf_map__next(NULL, obj);
	if (!map) {
		printf("finding a map in obj file failed\n");
		return 1;
	}
	map_fd = bpf_map__fd(map);

	if_idx = if_nametoindex(argv[optind]);
	if (!if_idx)
		if_idx = strtoul(argv[optind], NULL, 0);

	if (!if_idx) {
		fprintf(stderr, "Invalid ifname\n");
		return 1;
	}
	if_name = argv[optind];
	err = do_attach(if_idx, prog_fd, if_name);
	if (err)
		return err;

	if (signal(SIGINT, sig_handler) ||
	    signal(SIGHUP, sig_handler) ||
	    signal(SIGTERM, sig_handler)) {
		perror("signal");
		return 1;
	}

	pb_opts.sample_cb = print_bpf_output;
	pb = perf_buffer__new(map_fd, 8, &pb_opts);
	err = libbpf_get_error(pb);
	if (err) {
		perror("perf_buffer setup failed");
		return 1;
	}

	while ((ret = perf_buffer__poll(pb, 1000)) >= 0) {
	}

	kill(0, SIGINT);
	return ret;
}
Commit	Line	Data
1e54ad25 THJ	1	// SPDX-License-Identifier: GPL-2.0
	2	#include <stdio.h>
	3	#include <stdlib.h>
	4	#include <string.h>
	5	#include <linux/perf_event.h>
	6	#include <linux/bpf.h>
	7	#include <net/if.h>
	8	#include <errno.h>
	9	#include <assert.h>
	10	#include <sys/sysinfo.h>
	11	#include <sys/ioctl.h>
	12	#include <signal.h>
	13	#include <libbpf.h>
	14	#include <bpf/bpf.h>
6a545761	15	#include <sys/resource.h>
743e568c MF	16	#include <libgen.h>
743e568c MF	17	#include <linux/if_link.h>
1e54ad25 THJ	18
1e54ad25 THJ	19	#include "perf-sys.h"
1e54ad25 THJ	20
1e54ad25 THJ	21	#define MAX_CPUS 128
f58a4d51	22	static int if_idx;
1e54ad25	23	static char *if_name;
743e568c	24	static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
3b7a8ec2	25	static __u32 prog_id;
f58a4d51	26	static struct perf_buffer *pb = NULL;
1e54ad25 THJ	27
	28	static int do_attach(int idx, int fd, const char *name)
	29	{
3b7a8ec2 MF	30	struct bpf_prog_info info = {};
3b7a8ec2 MF	31	__u32 info_len = sizeof(info);
1e54ad25 THJ	32	int err;
1e54ad25 THJ	33
743e568c	34	err = bpf_set_link_xdp_fd(idx, fd, xdp_flags);
3b7a8ec2	35	if (err < 0) {
1e54ad25	36	printf("ERROR: failed to attach program to %s\n", name);
3b7a8ec2 MF	37	return err;
	38	}
	39
	40	err = bpf_obj_get_info_by_fd(fd, &info, &info_len);
	41	if (err) {
	42	printf("can't get prog info - %s\n", strerror(errno));
	43	return err;
	44	}
	45	prog_id = info.id;
1e54ad25 THJ	46
	47	return err;
	48	}
	49
	50	static int do_detach(int idx, const char *name)
	51	{
3b7a8ec2 MF	52	__u32 curr_prog_id = 0;
3b7a8ec2 MF	53	int err = 0;
1e54ad25	54
3b7a8ec2 MF	55	err = bpf_get_link_xdp_id(idx, &curr_prog_id, 0);
	56	if (err) {
	57	printf("bpf_get_link_xdp_id failed\n");
	58	return err;
	59	}
	60	if (prog_id == curr_prog_id) {
	61	err = bpf_set_link_xdp_fd(idx, -1, 0);
	62	if (err < 0)
	63	printf("ERROR: failed to detach prog from %s\n", name);
	64	} else if (!curr_prog_id) {
	65	printf("couldn't find a prog id on a %s\n", name);
	66	} else {
	67	printf("program on interface changed, not removing\n");
	68	}
1e54ad25 THJ	69
	70	return err;
	71	}
	72
	73	#define SAMPLE_SIZE 64
	74
f58a4d51	75	static void print_bpf_output(void ctx, int cpu, void data, __u32 size)
1e54ad25 THJ	76	{
	77	struct {
	78	__u16 cookie;
	79	__u16 pkt_len;
	80	__u8 pkt_data[SAMPLE_SIZE];
	81	} __packed *e = data;
	82	int i;
	83
	84	if (e->cookie != 0xdead) {
f58a4d51 AN	85	printf("BUG cookie %x sized %d\n", e->cookie, size);
f58a4d51 AN	86	return;
1e54ad25 THJ	87	}
	88
	89	printf("Pkt len: %-5d bytes. Ethernet hdr: ", e->pkt_len);
	90	for (i = 0; i < 14 && i < e->pkt_len; i++)
	91	printf("%02x ", e->pkt_data[i]);
	92	printf("\n");
1e54ad25 THJ	93	}
	94
	95	static void sig_handler(int signo)
	96	{
	97	do_detach(if_idx, if_name);
f58a4d51	98	perf_buffer__free(pb);
1e54ad25 THJ	99	exit(0);
	100	}
	101
743e568c MF	102	static void usage(const char *prog)
	103	{
	104	fprintf(stderr,
	105	"%s: %s [OPTS] <ifname\|ifindex>\n\n"
	106	"OPTS:\n"
	107	" -F force loading prog\n",
	108	__func__, prog);
	109	}
	110
1e54ad25 THJ	111	int main(int argc, char **argv)
1e54ad25 THJ	112	{
6a545761	113	struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
1e54ad25 THJ	114	struct bpf_prog_load_attr prog_load_attr = {
	115	.prog_type = BPF_PROG_TYPE_XDP,
	116	};
f58a4d51	117	struct perf_buffer_opts pb_opts = {};
743e568c MF	118	const char *optstr = "F";
743e568c MF	119	int prog_fd, map_fd, opt;
1e54ad25 THJ	120	struct bpf_object *obj;
1e54ad25 THJ	121	struct bpf_map *map;
1e54ad25	122	char filename[256];
f58a4d51	123	int ret, err;
1e54ad25	124
743e568c MF	125	while ((opt = getopt(argc, argv, optstr)) != -1) {
	126	switch (opt) {
	127	case 'F':
	128	xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
	129	break;
	130	default:
	131	usage(basename(argv[0]));
	132	return 1;
	133	}
	134	}
	135
	136	if (optind == argc) {
	137	usage(basename(argv[0]));
1e54ad25 THJ	138	return 1;
	139	}
	140
6a545761 MF	141	if (setrlimit(RLIMIT_MEMLOCK, &r)) {
	142	perror("setrlimit(RLIMIT_MEMLOCK)");
	143	return 1;
	144	}
	145
1e54ad25 THJ	146	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
	147	prog_load_attr.file = filename;
	148
	149	if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd))
	150	return 1;
	151
	152	if (!prog_fd) {
	153	printf("load_bpf_file: %s\n", strerror(errno));
	154	return 1;
	155	}
	156
	157	map = bpf_map__next(NULL, obj);
	158	if (!map) {
	159	printf("finding a map in obj file failed\n");
	160	return 1;
	161	}
	162	map_fd = bpf_map__fd(map);
	163
743e568c	164	if_idx = if_nametoindex(argv[optind]);
1e54ad25	165	if (!if_idx)
743e568c	166	if_idx = strtoul(argv[optind], NULL, 0);
1e54ad25 THJ	167
	168	if (!if_idx) {
	169	fprintf(stderr, "Invalid ifname\n");
	170	return 1;
	171	}
743e568c MF	172	if_name = argv[optind];
743e568c MF	173	err = do_attach(if_idx, prog_fd, if_name);
1e54ad25 THJ	174	if (err)
	175	return err;
	176
	177	if (signal(SIGINT, sig_handler) \|\|
	178	signal(SIGHUP, sig_handler) \|\|
	179	signal(SIGTERM, sig_handler)) {
	180	perror("signal");
	181	return 1;
	182	}
	183
f58a4d51 AN	184	pb_opts.sample_cb = print_bpf_output;
	185	pb = perf_buffer__new(map_fd, 8, &pb_opts);
	186	err = libbpf_get_error(pb);
	187	if (err) {
	188	perror("perf_buffer setup failed");
	189	return 1;
	190	}
1e54ad25	191
f58a4d51 AN	192	while ((ret = perf_buffer__poll(pb, 1000)) >= 0) {
f58a4d51 AN	193	}
1e54ad25	194
1e54ad25 THJ	195	kill(0, SIGINT);
	196	return ret;
	197	}