diff options
Diffstat (limited to 'samples/bpf/tc_l2_redirect_user.c')
-rw-r--r-- | samples/bpf/tc_l2_redirect_user.c | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/samples/bpf/tc_l2_redirect_user.c b/samples/bpf/tc_l2_redirect_user.c new file mode 100644 index 0000000000..d11a6e1e99 --- /dev/null +++ b/samples/bpf/tc_l2_redirect_user.c @@ -0,0 +1,70 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Copyright (c) 2016 Facebook + */ +#include <linux/unistd.h> +#include <linux/bpf.h> + +#include <stdlib.h> +#include <stdio.h> +#include <unistd.h> +#include <string.h> +#include <errno.h> + +#include <bpf/bpf.h> + +static void usage(void) +{ + printf("Usage: tc_l2_ipip_redirect [...]\n"); + printf(" -U <file> Update an already pinned BPF array\n"); + printf(" -i <ifindex> Interface index\n"); + printf(" -h Display this help\n"); +} + +int main(int argc, char **argv) +{ + const char *pinned_file = NULL; + int ifindex = -1; + int array_key = 0; + int array_fd = -1; + int ret = -1; + int opt; + + while ((opt = getopt(argc, argv, "F:U:i:")) != -1) { + switch (opt) { + /* General args */ + case 'U': + pinned_file = optarg; + break; + case 'i': + ifindex = atoi(optarg); + break; + default: + usage(); + goto out; + } + } + + if (ifindex < 0 || !pinned_file) { + usage(); + goto out; + } + + array_fd = bpf_obj_get(pinned_file); + if (array_fd < 0) { + fprintf(stderr, "bpf_obj_get(%s): %s(%d)\n", + pinned_file, strerror(errno), errno); + goto out; + } + + /* bpf_tunnel_key.remote_ipv4 expects host byte orders */ + ret = bpf_map_update_elem(array_fd, &array_key, &ifindex, 0); + if (ret) { + perror("bpf_map_update_elem"); + goto out; + } + +out: + if (array_fd != -1) + close(array_fd); + return ret; +} |