56 		 * close the subflow with a RST, as it is not behaving as negotiated.  in mptcp_parse_option()
58 		 * receiver MUST close the subflow with a RST, as it is considered  in mptcp_parse_option()
407 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_syn_options()  local
412 	subflow->snd_isn = TCP_SKB_CB(skb)->end_seq;  in mptcp_syn_options()
413 	if (subflow->request_mptcp) {  in mptcp_syn_options()
419 	} else if (subflow->request_join) {  in mptcp_syn_options()
420 		pr_debug("remote_token=%u, nonce=%u", subflow->remote_token,  in mptcp_syn_options()
421 			 subflow->local_nonce);  in mptcp_syn_options()
423 		opts->join_id = subflow->local_id;  in mptcp_syn_options()
424 		opts->token = subflow->remote_token;  in mptcp_syn_options()
425 		opts->nonce = subflow->local_nonce;  in mptcp_syn_options()
426 		opts->backup = subflow->request_bkup;  in mptcp_syn_options()
448 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_established_options_mp()  local
449 	struct mptcp_sock *msk = mptcp_sk(subflow->conn);  in mptcp_established_options_mp()
464 	if (subflow->fully_established || snd_data_fin_enable ||  in mptcp_established_options_mp()
465 	    subflow->snd_isn != TCP_SKB_CB(skb)->seq ||  in mptcp_established_options_mp()
469 	if (subflow->mp_capable) {  in mptcp_established_options_mp()
479 		opts->sndr_key = subflow->local_key;  in mptcp_established_options_mp()
480 		opts->rcvr_key = subflow->remote_key;  in mptcp_established_options_mp()
486 		 * packets that start the first subflow of an MPTCP connection,  in mptcp_established_options_mp()
503 		pr_debug("subflow=%p, local_key=%llu, remote_key=%llu map_len=%d",  in mptcp_established_options_mp()
504 			 subflow, subflow->local_key, subflow->remote_key,  in mptcp_established_options_mp()
508 	} else if (subflow->mp_join) {  in mptcp_established_options_mp()
510 		memcpy(opts->hmac, subflow->hmac, MPTCPOPT_HMAC_LEN);  in mptcp_established_options_mp()
512 		pr_debug("subflow=%p", subflow);  in mptcp_established_options_mp()
520 			set_bit(MPTCP_DELEGATE_ACK, &subflow->delegated_status);  in mptcp_established_options_mp()
522 			mptcp_subflow_delegate(subflow, MPTCP_DELEGATE_ACK);  in mptcp_established_options_mp()
528 static void mptcp_write_data_fin(struct mptcp_subflow_context *subflow,  in mptcp_write_data_fin()  argument
534 	u64 data_fin_tx_seq = READ_ONCE(mptcp_sk(subflow->conn)->write_seq) - 1;  in mptcp_write_data_fin()
561 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_established_options_dss()  local
562 	struct mptcp_sock *msk = mptcp_sk(subflow->conn);  in mptcp_established_options_dss()
584 			mptcp_write_data_fin(subflow, skb, &opts->ext_copy);  in mptcp_established_options_dss()
590 	 * if the first subflow may have the already the remote key handy  in mptcp_established_options_dss()
654 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_established_options_add_addr()  local
655 	struct mptcp_sock *msk = mptcp_sk(subflow->conn);  in mptcp_established_options_add_addr()
709 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_established_options_rm_addr()  local
710 	struct mptcp_sock *msk = mptcp_sk(subflow->conn);  in mptcp_established_options_rm_addr()
739 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_established_options_mp_prio()  local
744 	if (!subflow->send_mp_prio || (opts->suboptions & OPTIONS_MPTCP_MPC))  in mptcp_established_options_mp_prio()
753 	opts->backup = subflow->request_bkup;  in mptcp_established_options_mp_prio()
765 	const struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_established_options_rst()  local
772 	opts->reset_transient = subflow->reset_transient;  in mptcp_established_options_rst()
773 	opts->reset_reason = subflow->reset_reason;  in mptcp_established_options_rst()
784 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_established_options_fastclose()  local
785 	struct mptcp_sock *msk = mptcp_sk(subflow->conn);  in mptcp_established_options_fastclose()
787 	if (likely(!subflow->send_fastclose))  in mptcp_established_options_fastclose()
807 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_established_options_mp_fail()  local
809 	if (likely(!subflow->send_mp_fail))  in mptcp_established_options_mp_fail()
817 	opts->fail_seq = subflow->map_seq;  in mptcp_established_options_mp_fail()
829 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_established_options()  local
830 	struct mptcp_sock *msk = mptcp_sk(subflow->conn);  in mptcp_established_options()
926 				    struct mptcp_subflow_context *subflow,  in check_fully_established()  argument
931 	 * will make the subflow fully established  in check_fully_established()
933 	if (likely(subflow->fully_established)) {  in check_fully_established()
938 		if (TCP_SKB_CB(skb)->seq == subflow->ssn_offset + 1 &&  in check_fully_established()
940 		    subflow->mp_join && (mp_opt->suboptions & OPTIONS_MPTCP_MPJ) &&  in check_fully_established()
941 		    !subflow->request_join)  in check_fully_established()
946 	/* we must process OoO packets before the first subflow is fully  in check_fully_established()
951 	if (TCP_SKB_CB(skb)->seq != subflow->ssn_offset + 1) {  in check_fully_established()
952 		if (subflow->mp_join)  in check_fully_established()
954 		if (subflow->is_mptfo && mp_opt->suboptions & OPTION_MPTCP_MPC_ACK)  in check_fully_established()
956 		return subflow->mp_capable;  in check_fully_established()
959 	if (subflow->remote_key_valid &&  in check_fully_established()
973 		if (subflow->mp_join)  in check_fully_established()
975 		subflow->mp_capable = 0;  in check_fully_established()
989 	__mptcp_subflow_fully_established(msk, subflow, mp_opt);  in check_fully_established()
993 	/* if the subflow is not already linked into the conn_list, we can't  in check_fully_established()
994 	 * notify the PM: this subflow is still on the listener queue  in check_fully_established()
995 	 * and the PM possibly acquiring the subflow lock could race with  in check_fully_established()
998 	if (likely(subflow->pm_notified) || list_empty(&subflow->node))  in check_fully_established()
1001 	subflow->pm_notified = 1;  in check_fully_established()
1002 	if (subflow->mp_join) {  in check_fully_established()
1113 /* Return false if a subflow has been reset, else return true */
1116 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_incoming_options()  local
1117 	struct mptcp_sock *msk = mptcp_sk(subflow->conn);  in mptcp_incoming_options()
1127 		mptcp_data_lock(subflow->conn);  in mptcp_incoming_options()
1129 			__mptcp_check_push(subflow->conn, sk);  in mptcp_incoming_options()
1136 		__mptcp_data_acked(subflow->conn);  in mptcp_incoming_options()
1137 		mptcp_data_unlock(subflow->conn);  in mptcp_incoming_options()
1143 	/* The subflow can be in close state only if check_fully_established()  in mptcp_incoming_options()
1146 	if (!check_fully_established(msk, sk, subflow, skb, &mp_opt))  in mptcp_incoming_options()
1186 			subflow->reset_seen = 1;  in mptcp_incoming_options()
1187 			subflow->reset_reason = mp_opt.reset_reason;  in mptcp_incoming_options()
1188 			subflow->reset_transient = mp_opt.reset_transient;  in mptcp_incoming_options()
1226 			mptcp_crypto_key_sha(subflow->remote_key, NULL,  in mptcp_incoming_options()
1253 	struct mptcp_subflow_context *subflow;  in mptcp_set_rwin()  local
1259 	subflow = mptcp_subflow_ctx(ssk);  in mptcp_set_rwin()
1260 	msk = mptcp_sk(subflow->conn);  in mptcp_set_rwin()
1348 	struct mptcp_subflow_context *subflow;  in mptcp_write_options()  local
1582 		subflow = mptcp_subflow_ctx(ssk);  in mptcp_write_options()
1583 		subflow->send_mp_fail = 0;  in mptcp_write_options()
1604 		subflow = mptcp_subflow_ctx(ssk);  in mptcp_write_options()
1605 		subflow->send_mp_prio = 0;  in mptcp_write_options()