401 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_syn_options()  local
406 	subflow->snd_isn = TCP_SKB_CB(skb)->end_seq;  in mptcp_syn_options()
407 	if (subflow->request_mptcp) {  in mptcp_syn_options()
413 	} else if (subflow->request_join) {  in mptcp_syn_options()
414 		pr_debug("remote_token=%u, nonce=%u", subflow->remote_token,  in mptcp_syn_options()
415 			 subflow->local_nonce);  in mptcp_syn_options()
417 		opts->join_id = subflow->local_id;  in mptcp_syn_options()
418 		opts->token = subflow->remote_token;  in mptcp_syn_options()
419 		opts->nonce = subflow->local_nonce;  in mptcp_syn_options()
420 		opts->backup = subflow->request_bkup;  in mptcp_syn_options()
443 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_established_options_mp()  local
444 	struct mptcp_sock *msk = mptcp_sk(subflow->conn);  in mptcp_established_options_mp()
459 	if (subflow->fully_established || snd_data_fin_enable ||  in mptcp_established_options_mp()
460 	    subflow->snd_isn != TCP_SKB_CB(skb)->seq ||  in mptcp_established_options_mp()
464 	if (subflow->mp_capable) {  in mptcp_established_options_mp()
474 		opts->sndr_key = subflow->local_key;  in mptcp_established_options_mp()
475 		opts->rcvr_key = subflow->remote_key;  in mptcp_established_options_mp()
499 			 subflow, subflow->local_key, subflow->remote_key,  in mptcp_established_options_mp()
503 	} else if (subflow->mp_join) {  in mptcp_established_options_mp()
505 		memcpy(opts->hmac, subflow->hmac, MPTCPOPT_HMAC_LEN);  in mptcp_established_options_mp()
507 		pr_debug("subflow=%p", subflow);  in mptcp_established_options_mp()
515 			set_bit(MPTCP_DELEGATE_ACK, &subflow->delegated_status);  in mptcp_established_options_mp()
517 			mptcp_subflow_delegate(subflow, MPTCP_DELEGATE_ACK);  in mptcp_established_options_mp()
523 static void mptcp_write_data_fin(struct mptcp_subflow_context *subflow,  in mptcp_write_data_fin()  argument
529 	u64 data_fin_tx_seq = READ_ONCE(mptcp_sk(subflow->conn)->write_seq) - 1;  in mptcp_write_data_fin()
557 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_established_options_dss()  local
558 	struct mptcp_sock *msk = mptcp_sk(subflow->conn);  in mptcp_established_options_dss()
581 			mptcp_write_data_fin(subflow, skb, &opts->ext_copy);  in mptcp_established_options_dss()
651 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_established_options_add_addr()  local
652 	struct mptcp_sock *msk = mptcp_sk(subflow->conn);  in mptcp_established_options_add_addr()
703 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_established_options_rm_addr()  local
704 	struct mptcp_sock *msk = mptcp_sk(subflow->conn);  in mptcp_established_options_rm_addr()
733 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_established_options_mp_prio()  local
738 	if (!subflow->send_mp_prio || (opts->suboptions & OPTIONS_MPTCP_MPC))  in mptcp_established_options_mp_prio()
747 	opts->backup = subflow->request_bkup;  in mptcp_established_options_mp_prio()
759 	const struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_established_options_rst()  local
766 	opts->reset_transient = subflow->reset_transient;  in mptcp_established_options_rst()
767 	opts->reset_reason = subflow->reset_reason;  in mptcp_established_options_rst()
778 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_established_options_fastclose()  local
779 	struct mptcp_sock *msk = mptcp_sk(subflow->conn);  in mptcp_established_options_fastclose()
781 	if (likely(!subflow->send_fastclose))  in mptcp_established_options_fastclose()
801 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_established_options_mp_fail()  local
803 	if (likely(!subflow->send_mp_fail))  in mptcp_established_options_mp_fail()
811 	opts->fail_seq = subflow->map_seq;  in mptcp_established_options_mp_fail()
823 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_established_options()  local
824 	struct mptcp_sock *msk = mptcp_sk(subflow->conn);  in mptcp_established_options()
920 				    struct mptcp_subflow_context *subflow,  in check_fully_established()  argument
927 	if (likely(subflow->fully_established)) {  in check_fully_established()
932 		if (TCP_SKB_CB(skb)->seq == subflow->ssn_offset + 1 &&  in check_fully_established()
934 		    subflow->mp_join && (mp_opt->suboptions & OPTIONS_MPTCP_MPJ) &&  in check_fully_established()
935 		    !subflow->request_join)  in check_fully_established()
945 	if (TCP_SKB_CB(skb)->seq != subflow->ssn_offset + 1) {  in check_fully_established()
946 		if (subflow->mp_join)  in check_fully_established()
948 		return subflow->mp_capable;  in check_fully_established()
956 		subflow->fully_established = 1;  in check_fully_established()
966 		if (subflow->mp_join)  in check_fully_established()
968 		subflow->mp_capable = 0;  in check_fully_established()
979 	mptcp_subflow_fully_established(subflow, mp_opt);  in check_fully_established()
987 	if (likely(subflow->pm_notified) || list_empty(&subflow->node))  in check_fully_established()
990 	subflow->pm_notified = 1;  in check_fully_established()
991 	if (subflow->mp_join) {  in check_fully_established()
1099 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_incoming_options()  local
1100 	struct mptcp_sock *msk = mptcp_sk(subflow->conn);  in mptcp_incoming_options()
1110 		mptcp_data_lock(subflow->conn);  in mptcp_incoming_options()
1112 			__mptcp_check_push(subflow->conn, sk);  in mptcp_incoming_options()
1113 		__mptcp_data_acked(subflow->conn);  in mptcp_incoming_options()
1114 		mptcp_data_unlock(subflow->conn);  in mptcp_incoming_options()
1123 	if (!check_fully_established(msk, sk, subflow, skb, &mp_opt))  in mptcp_incoming_options()
1163 			subflow->reset_seen = 1;  in mptcp_incoming_options()
1164 			subflow->reset_reason = mp_opt.reset_reason;  in mptcp_incoming_options()
1165 			subflow->reset_transient = mp_opt.reset_transient;  in mptcp_incoming_options()
1188 			sock_hold(subflow->conn);  in mptcp_incoming_options()
1204 			mptcp_crypto_key_sha(subflow->remote_key, NULL,  in mptcp_incoming_options()
1231 	struct mptcp_subflow_context *subflow;  in mptcp_set_rwin()  local
1237 	subflow = mptcp_subflow_ctx(ssk);  in mptcp_set_rwin()
1238 	msk = mptcp_sk(subflow->conn);  in mptcp_set_rwin()
1325 	struct mptcp_subflow_context *subflow;  in mptcp_write_options()  local
1559 		subflow = mptcp_subflow_ctx(ssk);  in mptcp_write_options()
1560 		subflow->send_mp_fail = 0;  in mptcp_write_options()
1581 		subflow = mptcp_subflow_ctx(ssk);  in mptcp_write_options()
1582 		subflow->send_mp_prio = 0;  in mptcp_write_options()