mptcp_crypto_key_sha
mptcp_crypto_key_sha(subflow->remote_key, NULL,
void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn);
mptcp_crypto_key_sha(subflow->remote_key, &remote_token, NULL);
mptcp_crypto_key_sha(subflow_req->local_key,
mptcp_crypto_key_sha(subflow->remote_key, NULL, &subflow->iasn);
mptcp_crypto_key_sha(subflow_req->local_key,
mptcp_crypto_key_sha(*key, token, idsn);