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// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2017 Covalent IO, Inc. http://covalent.io
*/
static const char *__doc__ =
"XDP redirect tool, using BPF_MAP_TYPE_DEVMAP\n"
"Usage: xdp_redirect_map <IFINDEX|IFNAME>_IN <IFINDEX|IFNAME>_OUT\n";
#include <linux/bpf.h>
#include <linux/if_link.h>
#include <assert.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <net/if.h>
#include <unistd.h>
#include <libgen.h>
#include <getopt.h>
#include <bpf/bpf.h>
#include <bpf/libbpf.h>
#include "bpf_util.h"
#include "xdp_sample_user.h"
#include "xdp_redirect_map.skel.h"
static int mask = SAMPLE_RX_CNT | SAMPLE_REDIRECT_ERR_MAP_CNT |
SAMPLE_EXCEPTION_CNT | SAMPLE_DEVMAP_XMIT_CNT_MULTI;
DEFINE_SAMPLE_INIT(xdp_redirect_map);
static const struct option long_options[] = {
{ "help", no_argument, NULL, 'h' },
{ "skb-mode", no_argument, NULL, 'S' },
{ "force", no_argument, NULL, 'F' },
{ "load-egress", no_argument, NULL, 'X' },
{ "stats", no_argument, NULL, 's' },
{ "interval", required_argument, NULL, 'i' },
{ "verbose", no_argument, NULL, 'v' },
{}
};
static int verbose = 0;
int main(int argc, char **argv)
{
struct bpf_devmap_val devmap_val = {};
bool xdp_devmap_attached = false;
struct xdp_redirect_map *skel;
char str[2 * IF_NAMESIZE + 1];
char ifname_out[IF_NAMESIZE];
struct bpf_map *tx_port_map;
char ifname_in[IF_NAMESIZE];
int ifindex_in, ifindex_out;
unsigned long interval = 2;
int ret = EXIT_FAIL_OPTION;
struct bpf_program *prog;
bool generic = false;
bool force = false;
bool tried = false;
bool error = true;
int opt, key = 0;
while ((opt = getopt_long(argc, argv, "hSFXi:vs",
long_options, NULL)) != -1) {
switch (opt) {
case 'S':
generic = true;
/* devmap_xmit tracepoint not available */
mask &= ~(SAMPLE_DEVMAP_XMIT_CNT |
SAMPLE_DEVMAP_XMIT_CNT_MULTI);
break;
case 'F':
force = true;
break;
case 'X':
xdp_devmap_attached = true;
break;
case 'i':
interval = strtoul(optarg, NULL, 0);
break;
case 'v':
sample_switch_mode();
verbose = 1;
break;
case 's':
mask |= SAMPLE_REDIRECT_MAP_CNT;
break;
case 'h':
error = false;
default:
sample_usage(argv, long_options, __doc__, mask, error);
return ret;
}
}
if (argc <= optind + 1) {
sample_usage(argv, long_options, __doc__, mask, true);
goto end;
}
ifindex_in = if_nametoindex(argv[optind]);
if (!ifindex_in)
ifindex_in = strtoul(argv[optind], NULL, 0);
ifindex_out = if_nametoindex(argv[optind + 1]);
if (!ifindex_out)
ifindex_out = strtoul(argv[optind + 1], NULL, 0);
if (!ifindex_in || !ifindex_out) {
fprintf(stderr, "Bad interface index or name\n");
sample_usage(argv, long_options, __doc__, mask, true);
goto end;
}
skel = xdp_redirect_map__open();
if (!skel) {
fprintf(stderr, "Failed to xdp_redirect_map__open: %s\n",
strerror(errno));
ret = EXIT_FAIL_BPF;
goto end;
}
ret = sample_init_pre_load(skel);
if (ret < 0) {
fprintf(stderr, "Failed to sample_init_pre_load: %s\n", strerror(-ret));
ret = EXIT_FAIL_BPF;
goto end_destroy;
}
/* Load 2nd xdp prog on egress. */
if (xdp_devmap_attached) {
ret = get_mac_addr(ifindex_out, skel->rodata->tx_mac_addr);
if (ret < 0) {
fprintf(stderr, "Failed to get interface %d mac address: %s\n",
ifindex_out, strerror(-ret));
ret = EXIT_FAIL;
goto end_destroy;
}
if (verbose)
printf("Egress ifindex:%d using src MAC %02x:%02x:%02x:%02x:%02x:%02x\n",
ifindex_out,
skel->rodata->tx_mac_addr[0], skel->rodata->tx_mac_addr[1],
skel->rodata->tx_mac_addr[2], skel->rodata->tx_mac_addr[3],
skel->rodata->tx_mac_addr[4], skel->rodata->tx_mac_addr[5]);
}
skel->rodata->from_match[0] = ifindex_in;
skel->rodata->to_match[0] = ifindex_out;
ret = xdp_redirect_map__load(skel);
if (ret < 0) {
fprintf(stderr, "Failed to xdp_redirect_map__load: %s\n",
strerror(errno));
ret = EXIT_FAIL_BPF;
goto end_destroy;
}
ret = sample_init(skel, mask);
if (ret < 0) {
fprintf(stderr, "Failed to initialize sample: %s\n", strerror(-ret));
ret = EXIT_FAIL;
goto end_destroy;
}
prog = skel->progs.xdp_redirect_map_native;
tx_port_map = skel->maps.tx_port_native;
restart:
if (sample_install_xdp(prog, ifindex_in, generic, force) < 0) {
/* First try with struct bpf_devmap_val as value for generic
* mode, then fallback to sizeof(int) for older kernels.
*/
fprintf(stderr,
"Trying fallback to sizeof(int) as value_size for devmap in generic mode\n");
if (generic && !tried) {
prog = skel->progs.xdp_redirect_map_general;
tx_port_map = skel->maps.tx_port_general;
tried = true;
goto restart;
}
ret = EXIT_FAIL_XDP;
goto end_destroy;
}
/* Loading dummy XDP prog on out-device */
sample_install_xdp(skel->progs.xdp_redirect_dummy_prog, ifindex_out, generic, force);
devmap_val.ifindex = ifindex_out;
if (xdp_devmap_attached)
devmap_val.bpf_prog.fd = bpf_program__fd(skel->progs.xdp_redirect_map_egress);
ret = bpf_map_update_elem(bpf_map__fd(tx_port_map), &key, &devmap_val, 0);
if (ret < 0) {
fprintf(stderr, "Failed to update devmap value: %s\n",
strerror(errno));
ret = EXIT_FAIL_BPF;
goto end_destroy;
}
ret = EXIT_FAIL;
if (!if_indextoname(ifindex_in, ifname_in)) {
fprintf(stderr, "Failed to if_indextoname for %d: %s\n", ifindex_in,
strerror(errno));
goto end_destroy;
}
if (!if_indextoname(ifindex_out, ifname_out)) {
fprintf(stderr, "Failed to if_indextoname for %d: %s\n", ifindex_out,
strerror(errno));
goto end_destroy;
}
safe_strncpy(str, get_driver_name(ifindex_in), sizeof(str));
printf("Redirecting from %s (ifindex %d; driver %s) to %s (ifindex %d; driver %s)\n",
ifname_in, ifindex_in, str, ifname_out, ifindex_out, get_driver_name(ifindex_out));
snprintf(str, sizeof(str), "%s->%s", ifname_in, ifname_out);
ret = sample_run(interval, NULL, NULL);
if (ret < 0) {
fprintf(stderr, "Failed during sample run: %s\n", strerror(-ret));
ret = EXIT_FAIL;
goto end_destroy;
}
ret = EXIT_OK;
end_destroy:
xdp_redirect_map__destroy(skel);
end:
sample_exit(ret);
}
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