// SPDX-License-Identifier: GPL-2.0 #include <linux/stddef.h> #include <linux/bpf.h> #include <linux/in6.h> #include <sys/socket.h> #include <bpf/bpf_helpers.h> #include <bpf/bpf_endian.h> #include <bpf_sockopt_helpers.h> #define SERV6_IP_0 0xfaceb00c /* face:b00c:1234:5678::abcd */ #define SERV6_IP_1 0x12345678 #define SERV6_IP_2 0x00000000 #define SERV6_IP_3 0x0000abcd #define SERV6_PORT 6060 SEC("cgroup/recvmsg6") int recvmsg6_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_INET6) return 1; if (ctx->type != SOCK_STREAM && ctx->type != SOCK_DGRAM) return 1; if (!get_set_sk_priority(ctx)) return 1; ctx->user_ip6[0] = bpf_htonl(SERV6_IP_0); ctx->user_ip6[1] = bpf_htonl(SERV6_IP_1); ctx->user_ip6[2] = bpf_htonl(SERV6_IP_2); ctx->user_ip6[3] = bpf_htonl(SERV6_IP_3); ctx->user_port = bpf_htons(SERV6_PORT); return 1; } char _license[] SEC("license") = "GPL";