tools/testing/selftests/bpf/progs/connect4_dropper.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include <string.h>
   4
   5 #include <linux/stddef.h>
   6 #include <linux/bpf.h>
   7
   8 #include <sys/socket.h>
   9
  10 #include <bpf/bpf_helpers.h>
  11 #include <bpf/bpf_endian.h>
  12
  13 #define VERDICT_REJECT  0
  14 #define VERDICT_PROCEED 1
  15
  16 SEC("cgroup/connect4")
  17 int connect_v4_dropper(struct bpf_sock_addr *ctx)
  18 {
  19         if (ctx->type != SOCK_STREAM)
  20                 return VERDICT_PROCEED;
  21         if (ctx->user_port == bpf_htons(60123))
  22                 return VERDICT_REJECT;
  23         return VERDICT_PROCEED;
  24 }
  25
  26 char _license[] SEC("license") = "GPL";