// SPDX-License-Identifier: GPL-2.0 #include <linux/stddef.h> #include <linux/bpf.h> #include <linux/in.h> #include <sys/socket.h> #include <bpf/bpf_helpers.h> #include <bpf/bpf_endian.h> #include <bpf_sockopt_helpers.h> #define SERV4_IP 0xc0a801feU /* 192.168.1.254 */ #define SERV4_PORT 4040 SEC("cgroup/recvmsg4") int recvmsg4_prog(struct bpf_sock_addr *ctx) { struct bpf_sock *sk; __u32 user_ip4; __u16 user_port; sk = ctx->sk; if (!sk) return 1; if (sk->family != AF_INET) return 1; if (ctx->type != SOCK_STREAM && ctx->type != SOCK_DGRAM) return 1; if (!get_set_sk_priority(ctx)) return 1; ctx->user_ip4 = bpf_htonl(SERV4_IP); ctx->user_port = bpf_htons(SERV4_PORT); return 1; } char _license[] SEC("license") = "GPL";