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- // 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";
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