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#include <arpa/inet.h>
#include <errno.h>
#include <net/if.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <bpf/bpf.h>
#include <bpf/libbpf.h>
#include <linux/if_link.h>
int main(int argc, char **argv) {
if (argc != 2) {
fprintf(stderr, "Usage: %s <iface>\n", argv[0]);
return 1;
}
const char *const iface = argv[1];
int ifindex = if_nametoindex(iface);
if (!ifindex) {
perror("if_nametoindex");
return 1;
}
struct bpf_object *obj;
int prog_fd;
const char *const xdp_file = "xdp_udp_handler.o";
obj = bpf_object__open_file(xdp_file, NULL);
if (!obj) {
fprintf(stderr, "Error opening BPF object file: `%s'\n", xdp_file);
return 1;
}
if (bpf_object__load(obj)) {
fprintf(stderr, "Error loading BPF object\n");
return 1;
}
struct bpf_program *const prog =
bpf_object__find_program_by_name(obj, "xdp_udp_handler");
if (!prog) {
fprintf(stderr, "Couldn't find program\n");
return 1;
}
prog_fd = bpf_program__fd(prog);
if (prog_fd < 0) {
fprintf(stderr, "Invalid program FD\n");
return 1;
}
printf("Attaching BPF program in driver (native) mode..\n");
if (bpf_xdp_attach(ifindex, prog_fd,
XDP_FLAGS_UPDATE_IF_NOEXIST | XDP_FLAGS_DRV_MODE,
NULL) < 0) {
perror("bpf_xdp_attach");
printf("Attaching BPF program in kernel mode..\n");
if (bpf_xdp_attach(ifindex, prog_fd, XDP_FLAGS_UPDATE_IF_NOEXIST, NULL) <
0) {
perror("bpf_xdp_attach");
return 1;
}
}
printf("XDP program loaded\n");
return 0;
}
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