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// SPDX-License-Identifier: GPL-2.0
#include <string.h>
#include <linux/stddef.h>
#include <linux/bpf.h>
#include <sys/socket.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_endian.h>
#define VERDICT_REJECT 0
#define VERDICT_PROCEED 1
int port;
SEC("cgroup/connect4")
int connect_v4_dropper(struct bpf_sock_addr *ctx)
{
if (ctx->type != SOCK_STREAM)
return VERDICT_PROCEED;
if (ctx->user_port == bpf_htons(port))
return VERDICT_REJECT;
return VERDICT_PROCEED;
}
char _license[] SEC("license") = "GPL";
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