tools/testing/selftests/bpf/progs/getsockname4_prog.c

   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_IP4   0xc0a801fe // 192.168.1.254
  13 #define REWRITE_ADDRESS_PORT4 4040
  14
  15 SEC("cgroup/getsockname4")
  16 int getsockname_v4_prog(struct bpf_sock_addr *ctx)
  17 {
  18         ctx->user_ip4 = bpf_htonl(REWRITE_ADDRESS_IP4);
  19         ctx->user_port = bpf_htons(REWRITE_ADDRESS_PORT4);
  20
  21         return 1;
  22 }
  23
  24 char _license[] SEC("license") = "GPL";