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![Kumar Kartikeya Dwivedi](/assets/img/avatar_default.png)
Use the libbpf skeleton facility and other utilities provided by XDP samples helper. Since get_mac_addr is already provided by XDP samples helper, we drop it. Also convert to XDP samples helper similar to prior samples to minimize duplication of code. Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20210821002010.845777-21-memxor@gmail.com
219 lines
5.7 KiB
C
219 lines
5.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (c) 2017 Covalent IO, Inc. http://covalent.io
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*/
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static const char *__doc__ =
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"XDP redirect tool, using BPF_MAP_TYPE_DEVMAP\n"
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"Usage: xdp_redirect_map <IFINDEX|IFNAME>_IN <IFINDEX|IFNAME>_OUT\n";
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#include <linux/bpf.h>
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#include <linux/if_link.h>
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#include <assert.h>
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#include <errno.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include <string.h>
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#include <net/if.h>
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#include <unistd.h>
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#include <libgen.h>
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#include <getopt.h>
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#include <bpf/bpf.h>
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#include <bpf/libbpf.h>
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#include "bpf_util.h"
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#include "xdp_sample_user.h"
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#include "xdp_redirect_map.skel.h"
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static int mask = SAMPLE_RX_CNT | SAMPLE_REDIRECT_ERR_MAP_CNT |
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SAMPLE_EXCEPTION_CNT | SAMPLE_DEVMAP_XMIT_CNT_MULTI;
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DEFINE_SAMPLE_INIT(xdp_redirect_map);
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static const struct option long_options[] = {
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{ "help", no_argument, NULL, 'h' },
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{ "skb-mode", no_argument, NULL, 'S' },
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{ "force", no_argument, NULL, 'F' },
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{ "load-egress", no_argument, NULL, 'X' },
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{ "stats", no_argument, NULL, 's' },
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{ "interval", required_argument, NULL, 'i' },
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{ "verbose", no_argument, NULL, 'v' },
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{}
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};
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int main(int argc, char **argv)
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{
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struct bpf_devmap_val devmap_val = {};
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bool xdp_devmap_attached = false;
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struct xdp_redirect_map *skel;
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char str[2 * IF_NAMESIZE + 1];
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char ifname_out[IF_NAMESIZE];
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struct bpf_map *tx_port_map;
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char ifname_in[IF_NAMESIZE];
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int ifindex_in, ifindex_out;
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unsigned long interval = 2;
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int ret = EXIT_FAIL_OPTION;
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struct bpf_program *prog;
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bool generic = false;
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bool force = false;
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bool tried = false;
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bool error = true;
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int opt, key = 0;
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while ((opt = getopt_long(argc, argv, "hSFXi:vs",
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long_options, NULL)) != -1) {
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switch (opt) {
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case 'S':
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generic = true;
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/* devmap_xmit tracepoint not available */
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mask &= ~(SAMPLE_DEVMAP_XMIT_CNT |
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SAMPLE_DEVMAP_XMIT_CNT_MULTI);
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break;
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case 'F':
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force = true;
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break;
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case 'X':
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xdp_devmap_attached = true;
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break;
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case 'i':
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interval = strtoul(optarg, NULL, 0);
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break;
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case 'v':
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sample_switch_mode();
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break;
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case 's':
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mask |= SAMPLE_REDIRECT_MAP_CNT;
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break;
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case 'h':
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error = false;
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default:
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sample_usage(argv, long_options, __doc__, mask, error);
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return ret;
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}
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}
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if (argc <= optind + 1) {
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sample_usage(argv, long_options, __doc__, mask, true);
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goto end;
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}
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ifindex_in = if_nametoindex(argv[optind]);
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if (!ifindex_in)
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ifindex_in = strtoul(argv[optind], NULL, 0);
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ifindex_out = if_nametoindex(argv[optind + 1]);
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if (!ifindex_out)
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ifindex_out = strtoul(argv[optind + 1], NULL, 0);
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if (!ifindex_in || !ifindex_out) {
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fprintf(stderr, "Bad interface index or name\n");
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sample_usage(argv, long_options, __doc__, mask, true);
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goto end;
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}
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skel = xdp_redirect_map__open();
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if (!skel) {
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fprintf(stderr, "Failed to xdp_redirect_map__open: %s\n",
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strerror(errno));
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ret = EXIT_FAIL_BPF;
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goto end;
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}
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ret = sample_init_pre_load(skel);
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if (ret < 0) {
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fprintf(stderr, "Failed to sample_init_pre_load: %s\n", strerror(-ret));
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ret = EXIT_FAIL_BPF;
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goto end_destroy;
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}
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/* Load 2nd xdp prog on egress. */
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if (xdp_devmap_attached) {
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ret = get_mac_addr(ifindex_out, skel->rodata->tx_mac_addr);
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if (ret < 0) {
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fprintf(stderr, "Failed to get interface %d mac address: %s\n",
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ifindex_out, strerror(-ret));
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ret = EXIT_FAIL;
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goto end_destroy;
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}
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}
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skel->rodata->from_match[0] = ifindex_in;
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skel->rodata->to_match[0] = ifindex_out;
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ret = xdp_redirect_map__load(skel);
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if (ret < 0) {
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fprintf(stderr, "Failed to xdp_redirect_map__load: %s\n",
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strerror(errno));
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ret = EXIT_FAIL_BPF;
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goto end_destroy;
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}
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ret = sample_init(skel, mask);
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if (ret < 0) {
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fprintf(stderr, "Failed to initialize sample: %s\n", strerror(-ret));
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ret = EXIT_FAIL;
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goto end_destroy;
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}
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prog = skel->progs.xdp_redirect_map_native;
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tx_port_map = skel->maps.tx_port_native;
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restart:
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if (sample_install_xdp(prog, ifindex_in, generic, force) < 0) {
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/* First try with struct bpf_devmap_val as value for generic
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* mode, then fallback to sizeof(int) for older kernels.
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*/
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fprintf(stderr,
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"Trying fallback to sizeof(int) as value_size for devmap in generic mode\n");
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if (generic && !tried) {
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prog = skel->progs.xdp_redirect_map_general;
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tx_port_map = skel->maps.tx_port_general;
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tried = true;
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goto restart;
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}
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ret = EXIT_FAIL_XDP;
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goto end_destroy;
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}
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/* Loading dummy XDP prog on out-device */
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sample_install_xdp(skel->progs.xdp_redirect_dummy_prog, ifindex_out, generic, force);
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devmap_val.ifindex = ifindex_out;
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if (xdp_devmap_attached)
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devmap_val.bpf_prog.fd = bpf_program__fd(skel->progs.xdp_redirect_map_egress);
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ret = bpf_map_update_elem(bpf_map__fd(tx_port_map), &key, &devmap_val, 0);
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if (ret < 0) {
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fprintf(stderr, "Failed to update devmap value: %s\n",
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strerror(errno));
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ret = EXIT_FAIL_BPF;
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goto end_destroy;
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}
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ret = EXIT_FAIL;
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if (!if_indextoname(ifindex_in, ifname_in)) {
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fprintf(stderr, "Failed to if_indextoname for %d: %s\n", ifindex_in,
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strerror(errno));
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goto end_destroy;
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}
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if (!if_indextoname(ifindex_out, ifname_out)) {
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fprintf(stderr, "Failed to if_indextoname for %d: %s\n", ifindex_out,
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strerror(errno));
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goto end_destroy;
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}
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safe_strncpy(str, get_driver_name(ifindex_in), sizeof(str));
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printf("Redirecting from %s (ifindex %d; driver %s) to %s (ifindex %d; driver %s)\n",
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ifname_in, ifindex_in, str, ifname_out, ifindex_out, get_driver_name(ifindex_out));
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snprintf(str, sizeof(str), "%s->%s", ifname_in, ifname_out);
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ret = sample_run(interval, NULL, NULL);
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if (ret < 0) {
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fprintf(stderr, "Failed during sample run: %s\n", strerror(-ret));
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ret = EXIT_FAIL;
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goto end_destroy;
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}
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ret = EXIT_OK;
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end_destroy:
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xdp_redirect_map__destroy(skel);
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end:
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sample_exit(ret);
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}
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