406 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_syn_options()  local
411 	subflow->snd_isn = TCP_SKB_CB(skb)->end_seq;  in mptcp_syn_options()
412 	if (subflow->request_mptcp) {  in mptcp_syn_options()
418 	} else if (subflow->request_join) {  in mptcp_syn_options()
419 		pr_debug("remote_token=%u, nonce=%u", subflow->remote_token,  in mptcp_syn_options()
420 			 subflow->local_nonce);  in mptcp_syn_options()
422 		opts->join_id = subflow->local_id;  in mptcp_syn_options()
423 		opts->token = subflow->remote_token;  in mptcp_syn_options()
424 		opts->nonce = subflow->local_nonce;  in mptcp_syn_options()
425 		opts->backup = subflow->request_bkup;  in mptcp_syn_options()
447 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_established_options_mp()  local
448 	struct mptcp_sock *msk = mptcp_sk(subflow->conn);  in mptcp_established_options_mp()
463 	if (subflow->fully_established || snd_data_fin_enable ||  in mptcp_established_options_mp()
464 	    subflow->snd_isn != TCP_SKB_CB(skb)->seq ||  in mptcp_established_options_mp()
468 	if (subflow->mp_capable) {  in mptcp_established_options_mp()
478 		opts->sndr_key = subflow->local_key;  in mptcp_established_options_mp()
479 		opts->rcvr_key = subflow->remote_key;  in mptcp_established_options_mp()
503 			 subflow, subflow->local_key, subflow->remote_key,  in mptcp_established_options_mp()
507 	} else if (subflow->mp_join) {  in mptcp_established_options_mp()
509 		memcpy(opts->hmac, subflow->hmac, MPTCPOPT_HMAC_LEN);  in mptcp_established_options_mp()
511 		pr_debug("subflow=%p", subflow);  in mptcp_established_options_mp()
519 			set_bit(MPTCP_DELEGATE_ACK, &subflow->delegated_status);  in mptcp_established_options_mp()
521 			mptcp_subflow_delegate(subflow, MPTCP_DELEGATE_ACK);  in mptcp_established_options_mp()
527 static void mptcp_write_data_fin(struct mptcp_subflow_context *subflow,  in mptcp_write_data_fin()  argument
533 	u64 data_fin_tx_seq = READ_ONCE(mptcp_sk(subflow->conn)->write_seq) - 1;  in mptcp_write_data_fin()
560 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_established_options_dss()  local
561 	struct mptcp_sock *msk = mptcp_sk(subflow->conn);  in mptcp_established_options_dss()
583 			mptcp_write_data_fin(subflow, skb, &opts->ext_copy);  in mptcp_established_options_dss()
653 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_established_options_add_addr()  local
654 	struct mptcp_sock *msk = mptcp_sk(subflow->conn);  in mptcp_established_options_add_addr()
708 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_established_options_rm_addr()  local
709 	struct mptcp_sock *msk = mptcp_sk(subflow->conn);  in mptcp_established_options_rm_addr()
738 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_established_options_mp_prio()  local
743 	if (!subflow->send_mp_prio || (opts->suboptions & OPTIONS_MPTCP_MPC))  in mptcp_established_options_mp_prio()
752 	opts->backup = subflow->request_bkup;  in mptcp_established_options_mp_prio()
764 	const struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_established_options_rst()  local
771 	opts->reset_transient = subflow->reset_transient;  in mptcp_established_options_rst()
772 	opts->reset_reason = subflow->reset_reason;  in mptcp_established_options_rst()
783 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_established_options_fastclose()  local
784 	struct mptcp_sock *msk = mptcp_sk(subflow->conn);  in mptcp_established_options_fastclose()
786 	if (likely(!subflow->send_fastclose))  in mptcp_established_options_fastclose()
806 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_established_options_mp_fail()  local
808 	if (likely(!subflow->send_mp_fail))  in mptcp_established_options_mp_fail()
816 	opts->fail_seq = subflow->map_seq;  in mptcp_established_options_mp_fail()
828 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_established_options()  local
829 	struct mptcp_sock *msk = mptcp_sk(subflow->conn);  in mptcp_established_options()
925 				    struct mptcp_subflow_context *subflow,  in check_fully_established()  argument
932 	if (likely(subflow->fully_established)) {  in check_fully_established()
937 		if (TCP_SKB_CB(skb)->seq == subflow->ssn_offset + 1 &&  in check_fully_established()
939 		    subflow->mp_join && (mp_opt->suboptions & OPTIONS_MPTCP_MPJ) &&  in check_fully_established()
940 		    !subflow->request_join)  in check_fully_established()
950 	if (TCP_SKB_CB(skb)->seq != subflow->ssn_offset + 1) {  in check_fully_established()
951 		if (subflow->mp_join)  in check_fully_established()
953 		if (subflow->is_mptfo && mp_opt->suboptions & OPTION_MPTCP_MPC_ACK)  in check_fully_established()
955 		return subflow->mp_capable;  in check_fully_established()
958 	if (subflow->remote_key_valid &&  in check_fully_established()
964 		subflow->fully_established = 1;  in check_fully_established()
974 		if (subflow->mp_join)  in check_fully_established()
976 		subflow->mp_capable = 0;  in check_fully_established()
988 	mptcp_subflow_fully_established(subflow, mp_opt);  in check_fully_established()
996 	if (likely(subflow->pm_notified) || list_empty(&subflow->node))  in check_fully_established()
999 	subflow->pm_notified = 1;  in check_fully_established()
1000 	if (subflow->mp_join) {  in check_fully_established()
1114 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_incoming_options()  local
1115 	struct mptcp_sock *msk = mptcp_sk(subflow->conn);  in mptcp_incoming_options()
1125 		mptcp_data_lock(subflow->conn);  in mptcp_incoming_options()
1127 			__mptcp_check_push(subflow->conn, sk);  in mptcp_incoming_options()
1134 		__mptcp_data_acked(subflow->conn);  in mptcp_incoming_options()
1135 		mptcp_data_unlock(subflow->conn);  in mptcp_incoming_options()
1144 	if (!check_fully_established(msk, sk, subflow, skb, &mp_opt))  in mptcp_incoming_options()
1184 			subflow->reset_seen = 1;  in mptcp_incoming_options()
1185 			subflow->reset_reason = mp_opt.reset_reason;  in mptcp_incoming_options()
1186 			subflow->reset_transient = mp_opt.reset_transient;  in mptcp_incoming_options()
1224 			mptcp_crypto_key_sha(subflow->remote_key, NULL,  in mptcp_incoming_options()
1251 	struct mptcp_subflow_context *subflow;  in mptcp_set_rwin()  local
1257 	subflow = mptcp_subflow_ctx(ssk);  in mptcp_set_rwin()
1258 	msk = mptcp_sk(subflow->conn);  in mptcp_set_rwin()
1346 	struct mptcp_subflow_context *subflow;  in mptcp_write_options()  local
1580 		subflow = mptcp_subflow_ctx(ssk);  in mptcp_write_options()
1581 		subflow->send_mp_fail = 0;  in mptcp_write_options()
1602 		subflow = mptcp_subflow_ctx(ssk);  in mptcp_write_options()
1603 		subflow->send_mp_prio = 0;  in mptcp_write_options()