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1// SPDX-License-Identifier: GPL-2.02/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */3 4#include "vmlinux.h"5#include <bpf/bpf_helpers.h>6#include <bpf/bpf_tracing.h>7#include "bpf_tracing_net.h"8 9char _license[] SEC("license") = "GPL";10 11struct socket_cookie {12 __u64 cookie_key;13 __u64 cookie_value;14};15 16struct {17 __uint(type, BPF_MAP_TYPE_CGRP_STORAGE);18 __uint(map_flags, BPF_F_NO_PREALLOC);19 __type(key, int);20 __type(value, struct socket_cookie);21} socket_cookies SEC(".maps");22 23SEC("cgroup/connect6")24int set_cookie(struct bpf_sock_addr *ctx)25{26 struct socket_cookie *p;27 struct tcp_sock *tcp_sk;28 struct bpf_sock *sk;29 30 if (ctx->family != AF_INET6 || ctx->user_family != AF_INET6)31 return 1;32 33 sk = ctx->sk;34 if (!sk)35 return 1;36 37 tcp_sk = bpf_skc_to_tcp_sock(sk);38 if (!tcp_sk)39 return 1;40 41 p = bpf_cgrp_storage_get(&socket_cookies,42 tcp_sk->inet_conn.icsk_inet.sk.sk_cgrp_data.cgroup, 0,43 BPF_LOCAL_STORAGE_GET_F_CREATE);44 if (!p)45 return 1;46 47 p->cookie_value = 0xF;48 p->cookie_key = bpf_get_socket_cookie(ctx);49 return 1;50}51 52SEC("sockops")53int update_cookie_sockops(struct bpf_sock_ops *ctx)54{55 struct socket_cookie *p;56 struct tcp_sock *tcp_sk;57 struct bpf_sock *sk;58 59 if (ctx->family != AF_INET6 || ctx->op != BPF_SOCK_OPS_TCP_CONNECT_CB)60 return 1;61 62 sk = ctx->sk;63 if (!sk)64 return 1;65 66 tcp_sk = bpf_skc_to_tcp_sock(sk);67 if (!tcp_sk)68 return 1;69 70 p = bpf_cgrp_storage_get(&socket_cookies,71 tcp_sk->inet_conn.icsk_inet.sk.sk_cgrp_data.cgroup, 0, 0);72 if (!p)73 return 1;74 75 if (p->cookie_key != bpf_get_socket_cookie(ctx))76 return 1;77 78 p->cookie_value |= (ctx->local_port << 8);79 return 1;80}81 82SEC("fexit/inet_stream_connect")83int BPF_PROG(update_cookie_tracing, struct socket *sock,84 struct sockaddr *uaddr, int addr_len, int flags)85{86 struct socket_cookie *p;87 88 if (uaddr->sa_family != AF_INET6)89 return 0;90 91 p = bpf_cgrp_storage_get(&socket_cookies, sock->sk->sk_cgrp_data.cgroup, 0, 0);92 if (!p)93 return 0;94 95 if (p->cookie_key != bpf_get_socket_cookie(sock->sk))96 return 0;97 98 p->cookie_value |= 0xF0;99 return 0;100}101