102 lines
2.0 KiB
C
102 lines
2.0 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */
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#include "vmlinux.h"
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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#include "bpf_tracing_net.h"
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char _license[] SEC("license") = "GPL";
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struct socket_cookie {
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__u64 cookie_key;
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__u64 cookie_value;
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};
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struct {
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__uint(type, BPF_MAP_TYPE_CGRP_STORAGE);
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__uint(map_flags, BPF_F_NO_PREALLOC);
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__type(key, int);
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__type(value, struct socket_cookie);
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} socket_cookies SEC(".maps");
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SEC("cgroup/connect6")
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int set_cookie(struct bpf_sock_addr *ctx)
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{
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struct socket_cookie *p;
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struct tcp_sock *tcp_sk;
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struct bpf_sock *sk;
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if (ctx->family != AF_INET6 || ctx->user_family != AF_INET6)
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return 1;
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sk = ctx->sk;
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if (!sk)
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return 1;
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tcp_sk = bpf_skc_to_tcp_sock(sk);
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if (!tcp_sk)
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return 1;
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p = bpf_cgrp_storage_get(&socket_cookies,
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tcp_sk->inet_conn.icsk_inet.sk.sk_cgrp_data.cgroup, 0,
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BPF_LOCAL_STORAGE_GET_F_CREATE);
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if (!p)
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return 1;
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p->cookie_value = 0xF;
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p->cookie_key = bpf_get_socket_cookie(ctx);
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return 1;
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}
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SEC("sockops")
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int update_cookie_sockops(struct bpf_sock_ops *ctx)
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{
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struct socket_cookie *p;
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struct tcp_sock *tcp_sk;
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struct bpf_sock *sk;
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if (ctx->family != AF_INET6 || ctx->op != BPF_SOCK_OPS_TCP_CONNECT_CB)
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return 1;
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sk = ctx->sk;
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if (!sk)
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return 1;
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tcp_sk = bpf_skc_to_tcp_sock(sk);
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if (!tcp_sk)
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return 1;
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p = bpf_cgrp_storage_get(&socket_cookies,
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tcp_sk->inet_conn.icsk_inet.sk.sk_cgrp_data.cgroup, 0, 0);
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if (!p)
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return 1;
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if (p->cookie_key != bpf_get_socket_cookie(ctx))
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return 1;
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p->cookie_value |= (ctx->local_port << 8);
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return 1;
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}
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SEC("fexit/inet_stream_connect")
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int BPF_PROG(update_cookie_tracing, struct socket *sock,
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struct sockaddr *uaddr, int addr_len, int flags)
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{
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struct socket_cookie *p;
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struct tcp_sock *tcp_sk;
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if (uaddr->sa_family != AF_INET6)
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return 0;
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p = bpf_cgrp_storage_get(&socket_cookies, sock->sk->sk_cgrp_data.cgroup, 0, 0);
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if (!p)
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return 0;
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if (p->cookie_key != bpf_get_socket_cookie(sock->sk))
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return 0;
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p->cookie_value |= 0xF0;
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return 0;
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}
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