1// SPDX-License-Identifier: GPL-2.0-only
  2/* Copyright (c) 2016 John Fastabend <john.r.fastabend@intel.com>
  3 */
  4static const char *__doc__ =
  5"XDP redirect tool, using bpf_redirect helper\n"
  6"Usage: xdp_redirect <IFINDEX|IFNAME>_IN <IFINDEX|IFNAME>_OUT\n";
  7
  8#include <linux/bpf.h>
  9#include <linux/if_link.h>
 10#include <assert.h>
 11#include <errno.h>
 12#include <signal.h>
 13#include <stdio.h>
 14#include <stdlib.h>
 15#include <stdbool.h>
 16#include <string.h>
 17#include <net/if.h>
 18#include <unistd.h>
 19#include <libgen.h>
 20#include <getopt.h>
 21#include <bpf/bpf.h>
 22#include <bpf/libbpf.h>
 23#include "bpf_util.h"
 24#include "xdp_sample_user.h"
 25#include "xdp_redirect.skel.h"
 26
 27static int mask = SAMPLE_RX_CNT | SAMPLE_REDIRECT_ERR_CNT |
 28		  SAMPLE_EXCEPTION_CNT | SAMPLE_DEVMAP_XMIT_CNT_MULTI;
 29
 30DEFINE_SAMPLE_INIT(xdp_redirect);
 31
 32static const struct option long_options[] = {
 33	{"help",	no_argument,		NULL, 'h' },
 34	{"skb-mode",	no_argument,		NULL, 'S' },
 35	{"force",	no_argument,		NULL, 'F' },
 36	{"stats",	no_argument,		NULL, 's' },
 37	{"interval",	required_argument,	NULL, 'i' },
 38	{"verbose",	no_argument,		NULL, 'v' },
 39	{}
 40};
 41
 42int main(int argc, char **argv)
 43{
 44	int ifindex_in, ifindex_out, opt;
 45	char str[2 * IF_NAMESIZE + 1];
 46	char ifname_out[IF_NAMESIZE];
 47	char ifname_in[IF_NAMESIZE];
 48	int ret = EXIT_FAIL_OPTION;
 49	unsigned long interval = 2;
 50	struct xdp_redirect *skel;
 51	bool generic = false;
 52	bool force = false;
 53	bool error = true;
 54
 55	while ((opt = getopt_long(argc, argv, "hSFi:vs",
 56				  long_options, NULL)) != -1) {
 57		switch (opt) {
 58		case 'S':
 59			generic = true;
 60			mask &= ~(SAMPLE_DEVMAP_XMIT_CNT |
 61				  SAMPLE_DEVMAP_XMIT_CNT_MULTI);
 62			break;
 63		case 'F':
 64			force = true;
 65			break;
 66		case 'i':
 67			interval = strtoul(optarg, NULL, 0);
 68			break;
 69		case 'v':
 70			sample_switch_mode();
 71			break;
 72		case 's':
 73			mask |= SAMPLE_REDIRECT_CNT;
 74			break;
 75		case 'h':
 76			error = false;
 77		default:
 78			sample_usage(argv, long_options, __doc__, mask, error);
 79			return ret;
 80		}
 81	}
 82
 83	if (argc <= optind + 1) {
 84		sample_usage(argv, long_options, __doc__, mask, true);
 85		return ret;
 86	}
 87
 88	ifindex_in = if_nametoindex(argv[optind]);
 89	if (!ifindex_in)
 90		ifindex_in = strtoul(argv[optind], NULL, 0);
 91
 92	ifindex_out = if_nametoindex(argv[optind + 1]);
 93	if (!ifindex_out)
 94		ifindex_out = strtoul(argv[optind + 1], NULL, 0);
 95
 96	if (!ifindex_in || !ifindex_out) {
 97		fprintf(stderr, "Bad interface index or name\n");
 98		sample_usage(argv, long_options, __doc__, mask, true);
 99		goto end;
100	}
101
102	skel = xdp_redirect__open();
103	if (!skel) {
104		fprintf(stderr, "Failed to xdp_redirect__open: %s\n", strerror(errno));
105		ret = EXIT_FAIL_BPF;
106		goto end;
107	}
108
109	ret = sample_init_pre_load(skel);
110	if (ret < 0) {
111		fprintf(stderr, "Failed to sample_init_pre_load: %s\n", strerror(-ret));
112		ret = EXIT_FAIL_BPF;
113		goto end_destroy;
114	}
115
116	skel->rodata->from_match[0] = ifindex_in;
117	skel->rodata->to_match[0] = ifindex_out;
118	skel->rodata->ifindex_out = ifindex_out;
119
120	ret = xdp_redirect__load(skel);
121	if (ret < 0) {
122		fprintf(stderr, "Failed to xdp_redirect__load: %s\n", strerror(errno));
123		ret = EXIT_FAIL_BPF;
124		goto end_destroy;
125	}
126
127	ret = sample_init(skel, mask);
128	if (ret < 0) {
129		fprintf(stderr, "Failed to initialize sample: %s\n", strerror(-ret));
130		ret = EXIT_FAIL;
131		goto end_destroy;
132	}
133
134	ret = EXIT_FAIL_XDP;
135	if (sample_install_xdp(skel->progs.xdp_redirect_prog, ifindex_in,
136			       generic, force) < 0)
137		goto end_destroy;
138
139	/* Loading dummy XDP prog on out-device */
140	sample_install_xdp(skel->progs.xdp_redirect_dummy_prog, ifindex_out,
141			   generic, force);
142
143	ret = EXIT_FAIL;
144	if (!if_indextoname(ifindex_in, ifname_in)) {
145		fprintf(stderr, "Failed to if_indextoname for %d: %s\n", ifindex_in,
146			strerror(errno));
147		goto end_destroy;
148	}
149
150	if (!if_indextoname(ifindex_out, ifname_out)) {
151		fprintf(stderr, "Failed to if_indextoname for %d: %s\n", ifindex_out,
152			strerror(errno));
153		goto end_destroy;
154	}
155
156	safe_strncpy(str, get_driver_name(ifindex_in), sizeof(str));
157	printf("Redirecting from %s (ifindex %d; driver %s) to %s (ifindex %d; driver %s)\n",
158	       ifname_in, ifindex_in, str, ifname_out, ifindex_out, get_driver_name(ifindex_out));
159	snprintf(str, sizeof(str), "%s->%s", ifname_in, ifname_out);
160
161	ret = sample_run(interval, NULL, NULL);
162	if (ret < 0) {
163		fprintf(stderr, "Failed during sample run: %s\n", strerror(-ret));
164		ret = EXIT_FAIL;
165		goto end_destroy;
166	}
167	ret = EXIT_OK;
168end_destroy:
169	xdp_redirect__destroy(skel);
170end:
171	sample_exit(ret);
172}