// 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 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(60120)) return VERDICT_REJECT; return VERDICT_PROCEED; } char _license[] SEC("license") = "GPL";