// SPDX-License-Identifier: GPL-2.0
|
// Copyright (c) 2018 Facebook
|
|
#include <string.h>
|
|
#include <linux/stddef.h>
|
#include <linux/bpf.h>
|
#include <linux/in.h>
|
#include <linux/in6.h>
|
#include <sys/socket.h>
|
|
#include "bpf_helpers.h"
|
#include "bpf_endian.h"
|
|
#define SRC_REWRITE_IP6_0 0
|
#define SRC_REWRITE_IP6_1 0
|
#define SRC_REWRITE_IP6_2 0
|
#define SRC_REWRITE_IP6_3 6
|
|
#define DST_REWRITE_IP6_0 0
|
#define DST_REWRITE_IP6_1 0
|
#define DST_REWRITE_IP6_2 0
|
#define DST_REWRITE_IP6_3 1
|
|
#define DST_REWRITE_PORT6 6666
|
|
int _version SEC("version") = 1;
|
|
SEC("cgroup/connect6")
|
int connect_v6_prog(struct bpf_sock_addr *ctx)
|
{
|
struct sockaddr_in6 sa;
|
|
/* Rewrite destination. */
|
ctx->user_ip6[0] = bpf_htonl(DST_REWRITE_IP6_0);
|
ctx->user_ip6[1] = bpf_htonl(DST_REWRITE_IP6_1);
|
ctx->user_ip6[2] = bpf_htonl(DST_REWRITE_IP6_2);
|
ctx->user_ip6[3] = bpf_htonl(DST_REWRITE_IP6_3);
|
|
ctx->user_port = bpf_htons(DST_REWRITE_PORT6);
|
|
if (ctx->type == SOCK_DGRAM || ctx->type == SOCK_STREAM) {
|
/* Rewrite source. */
|
memset(&sa, 0, sizeof(sa));
|
|
sa.sin6_family = AF_INET6;
|
sa.sin6_port = bpf_htons(0);
|
|
sa.sin6_addr.s6_addr32[0] = bpf_htonl(SRC_REWRITE_IP6_0);
|
sa.sin6_addr.s6_addr32[1] = bpf_htonl(SRC_REWRITE_IP6_1);
|
sa.sin6_addr.s6_addr32[2] = bpf_htonl(SRC_REWRITE_IP6_2);
|
sa.sin6_addr.s6_addr32[3] = bpf_htonl(SRC_REWRITE_IP6_3);
|
|
if (bpf_bind(ctx, (struct sockaddr *)&sa, sizeof(sa)) != 0)
|
return 0;
|
}
|
|
return 1;
|
}
|
|
char _license[] SEC("license") = "GPL";
|
