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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020, Tessares SA. */
/* Copyright (c) 2022, SUSE. */
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include "bpf_tcp_helpers.h"
char _license[] SEC("license") = "GPL";
struct mptcp_storage {
__u32 invoked;
__u32 is_mptcp;
};
struct {
__uint(type, BPF_MAP_TYPE_SK_STORAGE);
__uint(map_flags, BPF_F_NO_PREALLOC);
__type(key, int);
__type(value, struct mptcp_storage);
} socket_storage_map SEC(".maps");
SEC("sockops")
int _sockops(struct bpf_sock_ops *ctx)
{
struct mptcp_storage *storage;
int op = (int)ctx->op;
struct tcp_sock *tsk;
struct bpf_sock *sk;
bool is_mptcp;
if (op != BPF_SOCK_OPS_TCP_CONNECT_CB)
return 1;
sk = ctx->sk;
if (!sk)
return 1;
tsk = bpf_skc_to_tcp_sock(sk);
if (!tsk)
return 1;
is_mptcp = bpf_core_field_exists(tsk->is_mptcp) ? tsk->is_mptcp : 0;
storage = bpf_sk_storage_get(&socket_storage_map, sk, 0,
BPF_SK_STORAGE_GET_F_CREATE);
if (!storage)
return 1;
storage->invoked++;
storage->is_mptcp = is_mptcp;
return 1;
}
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