samples/bpf/xdp_redirect_user.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* Copyright (c) 2016 John Fastabend <john.r.fastabend@intel.com>
   3  */
   4 static 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
  27 static int mask = SAMPLE_RX_CNT | SAMPLE_REDIRECT_ERR_CNT |
  28                   SAMPLE_EXCEPTION_CNT | SAMPLE_DEVMAP_XMIT_CNT_MULTI;
  29
  30 DEFINE_SAMPLE_INIT(xdp_redirect);
  31
  32 static 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
  42 int 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;
 168 end_destroy:
 169         xdp_redirect__destroy(skel);
 170 end:
 171         sample_exit(ret);
 172 }