cregit-Linux how code gets into the kernel

Release 4.14 samples/bpf/xdp_redirect_user.c

Directory: samples/bpf
/* Copyright (c) 2016 John Fastabend <john.r.fastabend@intel.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 */
#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 <unistd.h>
#include <libgen.h>

#include "bpf_load.h"
#include "bpf_util.h"
#include "libbpf.h"


static int ifindex_in;

static int ifindex_out;

static bool ifindex_out_xdp_dummy_attached = true;


static __u32 xdp_flags;


static void int_exit(int sig) { set_link_xdp_fd(ifindex_in, -1, xdp_flags); if (ifindex_out_xdp_dummy_attached) set_link_xdp_fd(ifindex_out, -1, xdp_flags); exit(0); }

Contributors

PersonTokensPropCommitsCommitProp
John Fastabend2360.53%133.33%
Jesper Dangaard Brouer1436.84%133.33%
Andy Gospodarek12.63%133.33%
Total38100.00%3100.00%


static void poll_stats(int interval, int ifindex) { unsigned int nr_cpus = bpf_num_possible_cpus(); __u64 values[nr_cpus], prev[nr_cpus]; memset(prev, 0, sizeof(prev)); while (1) { __u64 sum = 0; __u32 key = 0; int i; sleep(interval); assert(bpf_map_lookup_elem(map_fd[1], &key, values) == 0); for (i = 0; i < nr_cpus; i++) sum += (values[i] - prev[i]); if (sum) printf("ifindex %i: %10llu pkt/s\n", ifindex, sum / interval); memcpy(prev, values, sizeof(values)); } }

Contributors

PersonTokensPropCommitsCommitProp
John Fastabend138100.00%1100.00%
Total138100.00%1100.00%


static void usage(const char *prog) { fprintf(stderr, "usage: %s [OPTS] IFINDEX_IN IFINDEX_OUT\n\n" "OPTS:\n" " -S use skb-mode\n" " -N enforce native mode\n", prog); }

Contributors

PersonTokensPropCommitsCommitProp
Andy Gospodarek23100.00%1100.00%
Total23100.00%1100.00%


int main(int argc, char **argv) { const char *optstr = "SN"; char filename[256]; int ret, opt, key = 0; while ((opt = getopt(argc, argv, optstr)) != -1) { switch (opt) { case 'S': xdp_flags |= XDP_FLAGS_SKB_MODE; break; case 'N': xdp_flags |= XDP_FLAGS_DRV_MODE; break; default: usage(basename(argv[0])); return 1; } } if (optind == argc) { printf("usage: %s IFINDEX_IN IFINDEX_OUT\n", argv[0]); return 1; } ifindex_in = strtoul(argv[optind], NULL, 0); ifindex_out = strtoul(argv[optind + 1], NULL, 0); printf("input: %d output: %d\n", ifindex_in, ifindex_out); snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); if (load_bpf_file(filename)) { printf("%s", bpf_log_buf); return 1; } if (!prog_fd[0]) { printf("load_bpf_file: %s\n", strerror(errno)); return 1; } if (set_link_xdp_fd(ifindex_in, prog_fd[0], xdp_flags) < 0) { printf("ERROR: link set xdp fd failed on %d\n", ifindex_in); return 1; } /* Loading dummy XDP prog on out-device */ if (set_link_xdp_fd(ifindex_out, prog_fd[1], (xdp_flags | XDP_FLAGS_UPDATE_IF_NOEXIST)) < 0) { printf("WARN: link set xdp fd failed on %d\n", ifindex_out); ifindex_out_xdp_dummy_attached = false; } signal(SIGINT, int_exit); signal(SIGTERM, int_exit); /* bpf redirect port */ ret = bpf_map_update_elem(map_fd[0], &key, &ifindex_out, 0); if (ret) { perror("bpf_update_elem"); goto out; } poll_stats(2, ifindex_out); out: return 0; }

Contributors

PersonTokensPropCommitsCommitProp
John Fastabend18756.33%133.33%
Andy Gospodarek9628.92%133.33%
Jesper Dangaard Brouer4914.76%133.33%
Total332100.00%3100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
John Fastabend39065.88%133.33%
Andy Gospodarek13021.96%133.33%
Jesper Dangaard Brouer7212.16%133.33%
Total592100.00%3100.00%
Directory: samples/bpf
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