314 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in subflow_prep_synack()  local
322 		mptcp_fastopen_subflow_synack_set_params(subflow, req);  in subflow_prep_synack()
379 static bool subflow_thmac_valid(struct mptcp_subflow_context *subflow)  in subflow_thmac_valid()  argument
384 	subflow_generate_hmac(subflow->remote_key, subflow->local_key,  in subflow_thmac_valid()
385 			      subflow->remote_nonce, subflow->local_nonce,  in subflow_thmac_valid()
390 		 subflow, subflow->token, thmac, subflow->thmac);  in subflow_thmac_valid()
392 	return thmac == subflow->thmac;  in subflow_thmac_valid()
397 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);  in mptcp_subflow_reset()  local
398 	struct sock *sk = subflow->conn;  in mptcp_subflow_reset()
441 				   struct mptcp_subflow_context *subflow,  in subflow_set_remote_key()  argument
447 	if (subflow->remote_key_valid)  in subflow_set_remote_key()
450 	subflow->remote_key_valid = 1;  in subflow_set_remote_key()
451 	subflow->remote_key = mp_opt->sndr_key;  in subflow_set_remote_key()
452 	mptcp_crypto_key_sha(subflow->remote_key, NULL, &subflow->iasn);  in subflow_set_remote_key()
453 	subflow->iasn++;  in subflow_set_remote_key()
455 	WRITE_ONCE(msk->remote_key, subflow->remote_key);  in subflow_set_remote_key()
456 	WRITE_ONCE(msk->ack_seq, subflow->iasn);  in subflow_set_remote_key()
458 	atomic64_set(&msk->rcv_wnd_sent, subflow->iasn);  in subflow_set_remote_key()
463 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in subflow_finish_connect()  local
465 	struct sock *parent = subflow->conn;  in subflow_finish_connect()
468 	subflow->icsk_af_ops->sk_rx_dst_set(sk, skb);  in subflow_finish_connect()
471 	if (subflow->conn_finished)  in subflow_finish_connect()
476 	subflow->rel_write_seq = 1;  in subflow_finish_connect()
477 	subflow->conn_finished = 1;  in subflow_finish_connect()
478 	subflow->ssn_offset = TCP_SKB_CB(skb)->seq;  in subflow_finish_connect()
479 	pr_debug("subflow=%p synack seq=%x", subflow, subflow->ssn_offset);  in subflow_finish_connect()
482 	if (subflow->request_mptcp) {  in subflow_finish_connect()
495 		subflow->mp_capable = 1;  in subflow_finish_connect()
496 		subflow_set_remote_key(msk, subflow, &mp_opt);  in subflow_finish_connect()
500 	} else if (subflow->request_join) {  in subflow_finish_connect()
504 			subflow->reset_reason = MPTCP_RST_EMPTCP;  in subflow_finish_connect()
508 		subflow->backup = mp_opt.backup;  in subflow_finish_connect()
509 		subflow->thmac = mp_opt.thmac;  in subflow_finish_connect()
510 		subflow->remote_nonce = mp_opt.nonce;  in subflow_finish_connect()
511 		subflow->remote_id = mp_opt.join_id;  in subflow_finish_connect()
513 			 subflow, subflow->thmac, subflow->remote_nonce,  in subflow_finish_connect()
514 			 subflow->backup);  in subflow_finish_connect()
516 		if (!subflow_thmac_valid(subflow)) {  in subflow_finish_connect()
518 			subflow->reset_reason = MPTCP_RST_EMPTCP;  in subflow_finish_connect()
525 		subflow_generate_hmac(subflow->local_key, subflow->remote_key,  in subflow_finish_connect()
526 				      subflow->local_nonce,  in subflow_finish_connect()
527 				      subflow->remote_nonce,  in subflow_finish_connect()
529 		memcpy(subflow->hmac, hmac, MPTCPOPT_HMAC_LEN);  in subflow_finish_connect()
531 		subflow->mp_join = 1;  in subflow_finish_connect()
548 	subflow->reset_transient = 0;  in subflow_finish_connect()
552 static void subflow_set_local_id(struct mptcp_subflow_context *subflow, int local_id)  in subflow_set_local_id()  argument
554 	subflow->local_id = local_id;  in subflow_set_local_id()
555 	subflow->local_id_valid = 1;  in subflow_set_local_id()
560 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in subflow_chk_local_id()  local
561 	struct mptcp_sock *msk = mptcp_sk(subflow->conn);  in subflow_chk_local_id()
564 	if (likely(subflow->local_id_valid))  in subflow_chk_local_id()
571 	subflow_set_local_id(subflow, err);  in subflow_chk_local_id()
602 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in subflow_v4_conn_request()  local
604 	pr_debug("subflow=%p", subflow);  in subflow_v4_conn_request()
633 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in subflow_v6_conn_request()  local
635 	pr_debug("subflow=%p", subflow);  in subflow_v6_conn_request()
728 void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow,  in mptcp_subflow_fully_established()  argument
731 	struct mptcp_sock *msk = mptcp_sk(subflow->conn);  in mptcp_subflow_fully_established()
733 	subflow_set_remote_key(msk, subflow, mp_opt);  in mptcp_subflow_fully_established()
734 	subflow->fully_established = 1;  in mptcp_subflow_fully_established()
737 	if (subflow->is_mptfo)  in mptcp_subflow_fully_established()
738 		mptcp_fastopen_gen_msk_ackseq(msk, subflow, mp_opt);  in mptcp_subflow_fully_established()
899 static void dbg_bad_map(struct mptcp_subflow_context *subflow, u32 ssn)  in dbg_bad_map()  argument
902 		 ssn, subflow->map_subflow_seq, subflow->map_data_len);  in dbg_bad_map()
907 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);  in skb_is_fully_mapped()  local
914 	return skb->len - skb_consumed <= subflow->map_data_len -  in skb_is_fully_mapped()
915 					  mptcp_subflow_get_map_offset(subflow);  in skb_is_fully_mapped()
920 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);  in validate_mapping()  local
921 	u32 ssn = tcp_sk(ssk)->copied_seq - subflow->ssn_offset;  in validate_mapping()
923 	if (unlikely(before(ssn, subflow->map_subflow_seq))) {  in validate_mapping()
927 		dbg_bad_map(subflow, ssn);  in validate_mapping()
930 	if (unlikely(!before(ssn, subflow->map_subflow_seq +  in validate_mapping()
931 				  subflow->map_data_len))) {  in validate_mapping()
933 		dbg_bad_map(subflow, ssn);  in validate_mapping()
942 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);  in validate_data_csum()  local
951 	if (subflow->map_csum_len == subflow->map_data_len)  in validate_data_csum()
959 	delta = subflow->map_data_len - subflow->map_csum_len;  in validate_data_csum()
961 		seq = tcp_sk(ssk)->copied_seq + subflow->map_csum_len;  in validate_data_csum()
972 			subflow->map_data_csum = csum_block_add(subflow->map_data_csum, csum,  in validate_data_csum()
973 								subflow->map_csum_len);  in validate_data_csum()
976 			subflow->map_csum_len += len;  in validate_data_csum()
1005 	csum = __mptcp_make_csum(subflow->map_seq,  in validate_data_csum()
1006 				 subflow->map_subflow_seq,  in validate_data_csum()
1007 				 subflow->map_data_len + subflow->map_data_fin,  in validate_data_csum()
1008 				 subflow->map_data_csum);  in validate_data_csum()
1014 	subflow->valid_csum_seen = 1;  in validate_data_csum()
1021 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);  in get_mapping_status()  local
1037 		if (!subflow->map_valid && !skb->len) {  in get_mapping_status()
1051 		if (!subflow->map_valid)  in get_mapping_status()
1063 		subflow->map_data_len = 0;  in get_mapping_status()
1072 			if (subflow->map_valid) {  in get_mapping_status()
1105 	WRITE_ONCE(mptcp_sk(subflow->conn)->use_64bit_ack, !!mpext->dsn64);  in get_mapping_status()
1107 	if (subflow->map_valid) {  in get_mapping_status()
1109 		if (subflow->map_seq == map_seq &&  in get_mapping_status()
1110 		    subflow->map_subflow_seq == mpext->subflow_seq &&  in get_mapping_status()
1111 		    subflow->map_data_len == data_len &&  in get_mapping_status()
1112 		    subflow->map_csum_reqd == mpext->csum_reqd) {  in get_mapping_status()
1129 	subflow->map_seq = map_seq;  in get_mapping_status()
1130 	subflow->map_subflow_seq = mpext->subflow_seq;  in get_mapping_status()
1131 	subflow->map_data_len = data_len;  in get_mapping_status()
1132 	subflow->map_valid = 1;  in get_mapping_status()
1133 	subflow->map_data_fin = mpext->data_fin;  in get_mapping_status()
1134 	subflow->mpc_map = mpext->mpc_map;  in get_mapping_status()
1135 	subflow->map_csum_reqd = mpext->csum_reqd;  in get_mapping_status()
1136 	subflow->map_csum_len = 0;  in get_mapping_status()
1137 	subflow->map_data_csum = csum_unfold(mpext->csum);  in get_mapping_status()
1140 	if (unlikely(subflow->map_csum_reqd != csum_reqd))  in get_mapping_status()
1144 		 subflow->map_seq, subflow->map_subflow_seq,  in get_mapping_status()
1145 		 subflow->map_data_len, subflow->map_csum_reqd,  in get_mapping_status()
1146 		 subflow->map_data_csum);  in get_mapping_status()
1166 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);  in mptcp_subflow_discard_data()  local
1173 		 subflow->map_subflow_seq);  in mptcp_subflow_discard_data()
1178 	if (mptcp_subflow_get_map_offset(subflow) >= subflow->map_data_len)  in mptcp_subflow_discard_data()
1179 		subflow->map_valid = 0;  in mptcp_subflow_discard_data()
1193 static bool subflow_can_fallback(struct mptcp_subflow_context *subflow)  in subflow_can_fallback()  argument
1195 	struct mptcp_sock *msk = mptcp_sk(subflow->conn);  in subflow_can_fallback()
1197 	if (subflow->mp_join)  in subflow_can_fallback()
1200 		return !subflow->valid_csum_seen;  in subflow_can_fallback()
1202 		return !subflow->fully_established;  in subflow_can_fallback()
1207 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);  in mptcp_subflow_fail()  local
1226 	WRITE_ONCE(subflow->fail_tout, fail_tout);  in mptcp_subflow_fail()
1229 	mptcp_reset_tout_timer(msk, subflow->fail_tout);  in mptcp_subflow_fail()
1234 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);  in subflow_check_data_avail()  local
1240 		WRITE_ONCE(subflow->data_avail, MPTCP_SUBFLOW_NODATA);  in subflow_check_data_avail()
1241 	if (subflow->data_avail)  in subflow_check_data_avail()
1244 	msk = mptcp_sk(subflow->conn);  in subflow_check_data_avail()
1266 		ack_seq = mptcp_subflow_get_mapped_dsn(subflow);  in subflow_check_data_avail()
1274 		WRITE_ONCE(subflow->data_avail, MPTCP_SUBFLOW_DATA_AVAIL);  in subflow_check_data_avail()
1287 		    (subflow->mp_join || subflow->valid_csum_seen)) {  in subflow_check_data_avail()
1288 			subflow->send_mp_fail = 1;  in subflow_check_data_avail()
1291 				subflow->reset_transient = 0;  in subflow_check_data_avail()
1292 				subflow->reset_reason = MPTCP_RST_EMIDDLEBOX;  in subflow_check_data_avail()
1296 			WRITE_ONCE(subflow->data_avail, MPTCP_SUBFLOW_DATA_AVAIL);  in subflow_check_data_avail()
1300 		if (!subflow_can_fallback(subflow) && subflow->map_data_len) {  in subflow_check_data_avail()
1304 			subflow->reset_transient = 0;  in subflow_check_data_avail()
1305 			subflow->reset_reason = MPTCP_RST_EMPTCP;  in subflow_check_data_avail()
1313 			WRITE_ONCE(subflow->data_avail, MPTCP_SUBFLOW_NODATA);  in subflow_check_data_avail()
1321 	subflow->map_valid = 1;  in subflow_check_data_avail()
1322 	subflow->map_seq = READ_ONCE(msk->ack_seq);  in subflow_check_data_avail()
1323 	subflow->map_data_len = skb->len;  in subflow_check_data_avail()
1324 	subflow->map_subflow_seq = tcp_sk(ssk)->copied_seq - subflow->ssn_offset;  in subflow_check_data_avail()
1325 	WRITE_ONCE(subflow->data_avail, MPTCP_SUBFLOW_DATA_AVAIL);  in subflow_check_data_avail()
1331 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcp_subflow_data_available()  local
1334 	if (subflow->map_valid &&  in mptcp_subflow_data_available()
1335 	    mptcp_subflow_get_map_offset(subflow) >= subflow->map_data_len) {  in mptcp_subflow_data_available()
1336 		subflow->map_valid = 0;  in mptcp_subflow_data_available()
1337 		WRITE_ONCE(subflow->data_avail, MPTCP_SUBFLOW_NODATA);  in mptcp_subflow_data_available()
1340 			 subflow->map_subflow_seq,  in mptcp_subflow_data_available()
1341 			 subflow->map_data_len);  in mptcp_subflow_data_available()
1358 	const struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);  in mptcp_space()  local
1359 	const struct sock *sk = subflow->conn;  in mptcp_space()
1386 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in subflow_data_ready()  local
1388 	struct sock *parent = subflow->conn;  in subflow_data_ready()
1405 	WARN_ON_ONCE(!__mptcp_check_fallback(msk) && !subflow->mp_capable &&  in subflow_data_ready()
1406 		     !subflow->mp_join && !(state & TCPF_CLOSE));  in subflow_data_ready()
1435 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in mptcpv6_handle_mapped()  local
1442 		 subflow, sk->sk_family, icsk->icsk_af_ops, target, mapped);  in mptcpv6_handle_mapped()
1447 	subflow->icsk_af_ops = icsk->icsk_af_ops;  in mptcpv6_handle_mapped()
1487 	struct mptcp_subflow_context *subflow;  in __mptcp_subflow_connect()  local
1507 	subflow = mptcp_subflow_ctx(ssk);  in __mptcp_subflow_connect()
1509 		get_random_bytes(&subflow->local_nonce, sizeof(u32));  in __mptcp_subflow_connect()
1510 	} while (!subflow->local_nonce);  in __mptcp_subflow_connect()
1513 		subflow_set_local_id(subflow, local_id);  in __mptcp_subflow_connect()
1517 	subflow->remote_key_valid = 1;  in __mptcp_subflow_connect()
1518 	subflow->remote_key = msk->remote_key;  in __mptcp_subflow_connect()
1519 	subflow->local_key = msk->local_key;  in __mptcp_subflow_connect()
1520 	subflow->token = msk->token;  in __mptcp_subflow_connect()
1535 	mptcp_crypto_key_sha(subflow->remote_key, &remote_token, NULL);  in __mptcp_subflow_connect()
1538 	subflow->remote_token = remote_token;  in __mptcp_subflow_connect()
1539 	subflow->remote_id = remote_id;  in __mptcp_subflow_connect()
1540 	subflow->request_join = 1;  in __mptcp_subflow_connect()
1541 	subflow->request_bkup = !!(flags & MPTCP_PM_ADDR_FLAG_BACKUP);  in __mptcp_subflow_connect()
1542 	subflow->subflow_id = msk->subflow_id++;  in __mptcp_subflow_connect()
1546 	list_add_tail(&subflow->node, &msk->conn_list);  in __mptcp_subflow_connect()
1559 	list_del(&subflow->node);  in __mptcp_subflow_connect()
1560 	sock_put(mptcp_subflow_tcp_sock(subflow));  in __mptcp_subflow_connect()
1563 	subflow->disposable = 1;  in __mptcp_subflow_connect()
1621 	struct mptcp_subflow_context *subflow;  in mptcp_subflow_create_socket()  local
1673 	subflow = mptcp_subflow_ctx(sf->sk);  in mptcp_subflow_create_socket()
1674 	pr_debug("subflow=%p", subflow);  in mptcp_subflow_create_socket()
1678 	subflow->conn = sk;  in mptcp_subflow_create_socket()
1723 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);  in subflow_state_change()  local
1724 	struct sock *parent = subflow->conn;  in subflow_state_change()
1735 		subflow->conn_finished = 1;  in subflow_state_change()
1762 	struct mptcp_subflow_context *subflow;  in mptcp_subflow_queue_clean()  local
1789 		subflow = mptcp_subflow_ctx(ssk);  in mptcp_subflow_queue_clean()
1790 		if (!subflow || !subflow->conn)  in mptcp_subflow_queue_clean()
1793 		sk = subflow->conn;  in mptcp_subflow_queue_clean()
1958 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);  in tcp_release_cb_override()  local
1965 	status = set_mask_bits(&subflow->delegated_status, MPTCP_DELEGATE_ACTIONS_MASK, 0);  in tcp_release_cb_override()