1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (c) 2024 Google LLC */ 3 4 #include "vmlinux.h" 5 6 #include <string.h> 7 #include <bpf/bpf_helpers.h> 8 #include <bpf/bpf_endian.h> 9 #include <bpf/bpf_core_read.h> 10 #include "bpf_kfuncs.h" 11 12 #define REWRITE_ADDRESS_IP6_0 0xfaceb00c 13 #define REWRITE_ADDRESS_IP6_1 0x12345678 14 #define REWRITE_ADDRESS_IP6_2 0x00000000 15 #define REWRITE_ADDRESS_IP6_3 0x0000abcd 16 17 #define REWRITE_ADDRESS_PORT6 6060 18 19 SEC("cgroup/getsockname6") 20 int getsockname_v6_prog(struct bpf_sock_addr *ctx) 21 { 22 ctx->user_ip6[0] = bpf_htonl(REWRITE_ADDRESS_IP6_0); 23 ctx->user_ip6[1] = bpf_htonl(REWRITE_ADDRESS_IP6_1); 24 ctx->user_ip6[2] = bpf_htonl(REWRITE_ADDRESS_IP6_2); 25 ctx->user_ip6[3] = bpf_htonl(REWRITE_ADDRESS_IP6_3); 26 ctx->user_port = bpf_htons(REWRITE_ADDRESS_PORT6); 27 28 return 1; 29 } 30 31 char _license[] SEC("license") = "GPL"; 32