// SPDX-License-Identifier: GPL-2.0 // Copyright (c) 2018 Facebook #include "vmlinux.h" #include <bpf/bpf_helpers.h> #include <bpf/bpf_endian.h> #define AF_INET6 10 struct socket_cookie { __u64 cookie_key; __u32 cookie_value; }; struct { __uint(type, BPF_MAP_TYPE_SK_STORAGE); __uint(map_flags, BPF_F_NO_PREALLOC); __type(key, int); __type(value, struct socket_cookie); } socket_cookies SEC(".maps"); SEC("cgroup/connect6") int set_cookie(struct bpf_sock_addr *ctx) { struct socket_cookie *p; if (ctx->family != AF_INET6 || ctx->user_family != AF_INET6) return 1; p = bpf_sk_storage_get(&socket_cookies, ctx->sk, 0, BPF_SK_STORAGE_GET_F_CREATE); if (!p) return 1; p->cookie_value = 0xFF; p->cookie_key = bpf_get_socket_cookie(ctx); return 1; } SEC("sockops") int update_cookie(struct bpf_sock_ops *ctx) { struct bpf_sock *sk = ctx->sk; struct socket_cookie *p; if (ctx->family != AF_INET6) return 1; if (ctx->op != BPF_SOCK_OPS_TCP_CONNECT_CB) return 1; if (!sk) return 1; p = bpf_sk_storage_get(&socket_cookies, sk, 0, 0); if (!p) return 1; if (p->cookie_key != bpf_get_socket_cookie(ctx)) return 1; p->cookie_value = (ctx->local_port << 8) | p->cookie_value; return 1; } char _license[] SEC("license") = "GPL";