404 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_syn_options()  local
409 	subflow->snd_isn = TCP_SKB_CB(skb)->end_seq;  in mptcp_syn_options()
410 	if (subflow->request_mptcp) {  in mptcp_syn_options()
417 			subflow->request_mptcp = 0;  in mptcp_syn_options()
426 	} else if (subflow->request_join) {  in mptcp_syn_options()
427 		pr_debug("remote_token=%u, nonce=%u\n", subflow->remote_token,  in mptcp_syn_options()
428 			 subflow->local_nonce);  in mptcp_syn_options()
430 		opts->join_id = subflow->local_id;  in mptcp_syn_options()
431 		opts->token = subflow->remote_token;  in mptcp_syn_options()
432 		opts->nonce = subflow->local_nonce;  in mptcp_syn_options()
433 		opts->backup = subflow->request_bkup;  in mptcp_syn_options()
454 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_established_options_mp()  local
455 	struct mptcp_sock *msk = mptcp_sk(subflow->conn);  in mptcp_established_options_mp()
470 	if (READ_ONCE(subflow->fully_established) || snd_data_fin_enable ||  in mptcp_established_options_mp()
471 	    subflow->snd_isn != TCP_SKB_CB(skb)->seq ||  in mptcp_established_options_mp()
475 	if (subflow->mp_capable) {  in mptcp_established_options_mp()
485 		opts->sndr_key = subflow->local_key;  in mptcp_established_options_mp()
486 		opts->rcvr_key = subflow->remote_key;  in mptcp_established_options_mp()
510 			 subflow, subflow->local_key, subflow->remote_key,  in mptcp_established_options_mp()
514 	} else if (subflow->mp_join) {  in mptcp_established_options_mp()
516 		memcpy(opts->hmac, subflow->hmac, MPTCPOPT_HMAC_LEN);  in mptcp_established_options_mp()
518 		pr_debug("subflow=%p\n", subflow);  in mptcp_established_options_mp()
526 			set_bit(MPTCP_DELEGATE_ACK, &subflow->delegated_status);  in mptcp_established_options_mp()
528 			mptcp_subflow_delegate(subflow, MPTCP_DELEGATE_ACK);  in mptcp_established_options_mp()
534 static void mptcp_write_data_fin(struct mptcp_subflow_context *subflow,  in mptcp_write_data_fin()  argument
540 	u64 data_fin_tx_seq = READ_ONCE(mptcp_sk(subflow->conn)->write_seq) - 1;  in mptcp_write_data_fin()
567 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_established_options_dss()  local
568 	struct mptcp_sock *msk = mptcp_sk(subflow->conn);  in mptcp_established_options_dss()
590 			mptcp_write_data_fin(subflow, skb, &opts->ext_copy);  in mptcp_established_options_dss()
659 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_established_options_add_addr()  local
660 	struct mptcp_sock *msk = mptcp_sk(subflow->conn);  in mptcp_established_options_add_addr()
723 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_established_options_rm_addr()  local
724 	struct mptcp_sock *msk = mptcp_sk(subflow->conn);  in mptcp_established_options_rm_addr()
753 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_established_options_mp_prio()  local
758 	if (!subflow->send_mp_prio || (opts->suboptions & OPTIONS_MPTCP_MPC))  in mptcp_established_options_mp_prio()
767 	opts->backup = subflow->request_bkup;  in mptcp_established_options_mp_prio()
779 	const struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_established_options_rst()  local
786 	opts->reset_transient = subflow->reset_transient;  in mptcp_established_options_rst()
787 	opts->reset_reason = subflow->reset_reason;  in mptcp_established_options_rst()
798 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_established_options_fastclose()  local
799 	struct mptcp_sock *msk = mptcp_sk(subflow->conn);  in mptcp_established_options_fastclose()
801 	if (likely(!subflow->send_fastclose))  in mptcp_established_options_fastclose()
821 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_established_options_mp_fail()  local
823 	if (likely(!subflow->send_mp_fail))  in mptcp_established_options_mp_fail()
831 	opts->fail_seq = subflow->map_seq;  in mptcp_established_options_mp_fail()
843 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_established_options()  local
844 	struct mptcp_sock *msk = mptcp_sk(subflow->conn);  in mptcp_established_options()
943 				    struct mptcp_subflow_context *subflow,  in check_fully_established()  argument
950 	if (likely(READ_ONCE(subflow->fully_established))) {  in check_fully_established()
955 		if (TCP_SKB_CB(skb)->seq == subflow->ssn_offset + 1 &&  in check_fully_established()
957 		    subflow->mp_join && (mp_opt->suboptions & OPTIONS_MPTCP_MPJ) &&  in check_fully_established()
958 		    !subflow->request_join)  in check_fully_established()
968 	if (TCP_SKB_CB(skb)->seq != subflow->ssn_offset + 1) {  in check_fully_established()
969 		if (subflow->mp_join)  in check_fully_established()
971 		if (subflow->is_mptfo && mp_opt->suboptions & OPTION_MPTCP_MPC_ACK)  in check_fully_established()
973 		return subflow->mp_capable;  in check_fully_established()
976 	if (subflow->remote_key_valid &&  in check_fully_established()
979 	      (!mp_opt->echo || subflow->mp_join)))) {  in check_fully_established()
991 		if (subflow->mp_join)  in check_fully_established()
993 		subflow->mp_capable = 0;  in check_fully_established()
1009 	__mptcp_subflow_fully_established(msk, subflow, mp_opt);  in check_fully_established()
1018 	if (likely(subflow->pm_notified) || list_empty(&subflow->node))  in check_fully_established()
1021 	subflow->pm_notified = 1;  in check_fully_established()
1022 	if (subflow->mp_join) {  in check_fully_established()
1060 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);  in rwin_update()  local
1072 	if (!after64(mptcp_rcv_wnd, subflow->rcv_wnd_sent))  in rwin_update()
1078 	tp->rcv_wnd += mptcp_rcv_wnd - subflow->rcv_wnd_sent;  in rwin_update()
1079 	subflow->rcv_wnd_sent = mptcp_rcv_wnd;  in rwin_update()
1164 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_incoming_options()  local
1165 	struct mptcp_sock *msk = mptcp_sk(subflow->conn);  in mptcp_incoming_options()
1175 		mptcp_data_lock(subflow->conn);  in mptcp_incoming_options()
1177 			__mptcp_check_push(subflow->conn, sk);  in mptcp_incoming_options()
1184 		__mptcp_data_acked(subflow->conn);  in mptcp_incoming_options()
1185 		mptcp_data_unlock(subflow->conn);  in mptcp_incoming_options()
1194 	if (!check_fully_established(msk, sk, subflow, skb, &mp_opt))  in mptcp_incoming_options()
1234 			subflow->reset_seen = 1;  in mptcp_incoming_options()
1235 			subflow->reset_reason = mp_opt.reset_reason;  in mptcp_incoming_options()
1236 			subflow->reset_transient = mp_opt.reset_transient;  in mptcp_incoming_options()
1275 			mptcp_crypto_key_sha(subflow->remote_key, NULL,  in mptcp_incoming_options()
1302 	struct mptcp_subflow_context *subflow;  in mptcp_set_rwin()  local
1308 	subflow = mptcp_subflow_ctx(ssk);  in mptcp_set_rwin()
1309 	msk = mptcp_sk(subflow->conn);  in mptcp_set_rwin()
1363 	subflow->rcv_wnd_sent = rcv_wnd_new;  in mptcp_set_rwin()
1369 	struct mptcp_subflow_context *subflow;  in mptcp_track_rwin()  local
1375 	subflow = mptcp_subflow_ctx(ssk);  in mptcp_track_rwin()
1376 	msk = mptcp_sk(subflow->conn);  in mptcp_track_rwin()
1419 	struct mptcp_subflow_context *subflow;  in mptcp_write_options()  local
1653 		subflow = mptcp_subflow_ctx(ssk);  in mptcp_write_options()
1654 		subflow->send_mp_fail = 0;  in mptcp_write_options()
1679 		subflow = mptcp_subflow_ctx(ssk);  in mptcp_write_options()
1680 		subflow->send_mp_prio = 0;  in mptcp_write_options()