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// SPDX-License-Identifier: GPL-2.0
#include "bpf_tracing_net.h"
char _license[] SEC("license") = "GPL";
int sk_index;
int redirect_idx;
int trace_port;
int helper_ret;
struct {
__uint(type, BPF_MAP_TYPE_SOCKMAP);
__uint(key_size, sizeof(__u32));
__uint(value_size, sizeof(__u32));
__uint(max_entries, 100);
} sock_map SEC(".maps");
SEC("sockops")
int mptcp_sockmap_inject(struct bpf_sock_ops *skops)
{
struct bpf_sock *sk;
/* only accept specified connection */
if (skops->local_port != trace_port ||
skops->op != BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB)
return 1;
sk = skops->sk;
if (!sk)
return 1;
/* update sk handler */
helper_ret = bpf_sock_map_update(skops, &sock_map, &sk_index, BPF_NOEXIST);
return 1;
}
SEC("sk_skb/stream_verdict")
int mptcp_sockmap_redirect(struct __sk_buff *skb)
{
/* redirect skb to the sk under sock_map[redirect_idx] */
return bpf_sk_redirect_map(skb, &sock_map, redirect_idx, 0);
}
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