450 	struct mptcp_ext *mpext;  in mptcp_established_options_mp()  local
470 		mpext = mptcp_get_ext(skb);  in mptcp_established_options_mp()
471 		data_len = mpext ? mpext->data_len : 0;  in mptcp_established_options_mp()
493 				opts->data_seq = mpext->data_seq;  in mptcp_established_options_mp()
494 				opts->subflow_seq = mpext->subflow_seq;  in mptcp_established_options_mp()
495 				opts->csum = mpext->csum;  in mptcp_established_options_mp()
564 	struct mptcp_ext *mpext;  in mptcp_established_options_dss()  local
570 	mpext = skb ? mptcp_get_ext(skb) : NULL;  in mptcp_established_options_dss()
572 	if (!skb || (mpext && mpext->use_map) || snd_data_fin_enable) {  in mptcp_established_options_dss()
575 		if (mpext) {  in mptcp_established_options_dss()
579 			opts->ext_copy = *mpext;  in mptcp_established_options_dss()
1121 	struct mptcp_ext *mpext;  in mptcp_incoming_options()  local
1217 	mpext = skb_ext_add(skb, SKB_EXT_MPTCP);  in mptcp_incoming_options()
1218 	if (!mpext)  in mptcp_incoming_options()
1221 	memset(mpext, 0, sizeof(*mpext));  in mptcp_incoming_options()
1229 					     &mpext->data_seq);  in mptcp_incoming_options()
1230 			mpext->data_seq++;  in mptcp_incoming_options()
1231 			mpext->subflow_seq = 1;  in mptcp_incoming_options()
1232 			mpext->dsn64 = 1;  in mptcp_incoming_options()
1233 			mpext->mpc_map = 1;  in mptcp_incoming_options()
1234 			mpext->data_fin = 0;  in mptcp_incoming_options()
1236 			mpext->data_seq = mp_opt.data_seq;  in mptcp_incoming_options()
1237 			mpext->subflow_seq = mp_opt.subflow_seq;  in mptcp_incoming_options()
1238 			mpext->dsn64 = mp_opt.dsn64;  in mptcp_incoming_options()
1239 			mpext->data_fin = mp_opt.data_fin;  in mptcp_incoming_options()
1241 		mpext->data_len = mp_opt.data_len;  in mptcp_incoming_options()
1242 		mpext->use_map = 1;  in mptcp_incoming_options()
1243 		mpext->csum_reqd = !!(mp_opt.suboptions & OPTION_MPTCP_CSUMREQD);  in mptcp_incoming_options()
1245 		if (mpext->csum_reqd)  in mptcp_incoming_options()
1246 			mpext->csum = mp_opt.csum;  in mptcp_incoming_options()
1330 static __sum16 mptcp_make_csum(const struct mptcp_ext *mpext)  in mptcp_make_csum()  argument
1332 	return __mptcp_make_csum(mpext->data_seq, mpext->subflow_seq, mpext->data_len,  in mptcp_make_csum()
1333 				 ~csum_unfold(mpext->csum));  in mptcp_make_csum()
1375 		struct mptcp_ext *mpext = &opts->ext_copy;  in mptcp_write_options()  local
1379 		if (mpext->use_ack) {  in mptcp_write_options()
1381 			if (mpext->ack64) {  in mptcp_write_options()
1389 		if (mpext->use_map) {  in mptcp_write_options()
1396 			if (mpext->data_fin)  in mptcp_write_options()
1405 		if (mpext->use_ack) {  in mptcp_write_options()
1406 			if (mpext->ack64) {  in mptcp_write_options()
1407 				put_unaligned_be64(mpext->data_ack, ptr);  in mptcp_write_options()
1410 				put_unaligned_be32(mpext->data_ack32, ptr);  in mptcp_write_options()
1415 		if (mpext->use_map) {  in mptcp_write_options()
1416 			put_unaligned_be64(mpext->data_seq, ptr);  in mptcp_write_options()
1418 			put_unaligned_be32(mpext->subflow_seq, ptr);  in mptcp_write_options()
1424 				put_len_csum(mpext->data_len,  in mptcp_write_options()
1425 					     (mpext->data_len ? mptcp_make_csum(mpext) : 0),  in mptcp_write_options()
1428 				put_unaligned_be32(mpext->data_len << 16 |  in mptcp_write_options()