katran/lib/bpf/xdp_root.c

/* Copyright (C) 2018-present, Facebook, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "bpf.h"
#include "bpf_helpers.h"

#define ROOT_ARRAY_SIZE 3

struct {
  __uint(type, BPF_MAP_TYPE_PROG_ARRAY);
  __type(key, __u32);
  __type(value, __u32);
  __uint(max_entries, ROOT_ARRAY_SIZE);
} root_array SEC(".maps");

SEC("xdp-root")
int xdp_root(struct xdp_md* ctx) {
  __u32* fd;
#pragma clang loop unroll(full)
  for (__u32 i = 0; i < ROOT_ARRAY_SIZE; i++) {
    bpf_tail_call(ctx, &root_array, i);
  }
  return XDP_PASS;
}

char _license[] SEC("license") = "GPL";