397 		       unsigned int *size, struct mptcp_out_options *opts)  in mptcp_syn_options()  argument
406 		opts->suboptions = OPTION_MPTCP_MPC_SYN;  in mptcp_syn_options()
407 		opts->csum_reqd = mptcp_is_checksum_enabled(sock_net(sk));  in mptcp_syn_options()
408 		opts->allow_join_id0 = mptcp_allow_join_id0(sock_net(sk));  in mptcp_syn_options()
414 		opts->suboptions = OPTION_MPTCP_MPJ_SYN;  in mptcp_syn_options()
415 		opts->join_id = subflow->local_id;  in mptcp_syn_options()
416 		opts->token = subflow->remote_token;  in mptcp_syn_options()
417 		opts->nonce = subflow->local_nonce;  in mptcp_syn_options()
418 		opts->backup = subflow->request_bkup;  in mptcp_syn_options()
461 					 struct mptcp_out_options *opts)  in mptcp_established_options_mp()  argument
492 		opts->data_len = data_len;  in mptcp_established_options_mp()
493 		opts->suboptions = OPTION_MPTCP_MPC_ACK;  in mptcp_established_options_mp()
494 		opts->sndr_key = subflow->local_key;  in mptcp_established_options_mp()
495 		opts->rcvr_key = subflow->remote_key;  in mptcp_established_options_mp()
496 		opts->csum_reqd = READ_ONCE(msk->csum_enabled);  in mptcp_established_options_mp()
497 		opts->allow_join_id0 = mptcp_allow_join_id0(sock_net(sk));  in mptcp_established_options_mp()
506 			if (opts->csum_reqd) {  in mptcp_established_options_mp()
508 				opts->data_seq = mpext->data_seq;  in mptcp_established_options_mp()
509 				opts->subflow_seq = mpext->subflow_seq;  in mptcp_established_options_mp()
510 				opts->csum = mpext->csum;  in mptcp_established_options_mp()
524 		opts->suboptions = OPTION_MPTCP_MPJ_ACK;  in mptcp_established_options_mp()
525 		memcpy(opts->hmac, subflow->hmac, MPTCPOPT_HMAC_LEN);  in mptcp_established_options_mp()
567 					  struct mptcp_out_options *opts)  in mptcp_established_options_dss()  argument
577 	opts->csum_reqd = READ_ONCE(msk->csum_enabled);  in mptcp_established_options_dss()
584 			if (opts->csum_reqd)  in mptcp_established_options_dss()
587 			opts->ext_copy = *mpext;  in mptcp_established_options_dss()
593 			mptcp_write_data_fin(subflow, skb, &opts->ext_copy);  in mptcp_established_options_dss()
594 		opts->suboptions = OPTION_MPTCP_DSS;  in mptcp_established_options_dss()
601 	opts->ext_copy.use_ack = 0;  in mptcp_established_options_dss()
610 		opts->ext_copy.data_ack = ack_seq;  in mptcp_established_options_dss()
611 		opts->ext_copy.ack64 = 1;  in mptcp_established_options_dss()
614 		opts->ext_copy.data_ack32 = (uint32_t)ack_seq;  in mptcp_established_options_dss()
615 		opts->ext_copy.ack64 = 0;  in mptcp_established_options_dss()
617 	opts->ext_copy.use_ack = 1;  in mptcp_established_options_dss()
618 	opts->suboptions = OPTION_MPTCP_DSS;  in mptcp_established_options_dss()
661 					       struct mptcp_out_options *opts)  in mptcp_established_options_add_addr()  argument
675 	    (opts->suboptions & (OPTION_MPTCP_MPJ_ACK | OPTION_MPTCP_MPC_ACK)) ||  in mptcp_established_options_add_addr()
676 	    !mptcp_pm_add_addr_signal(msk, skb, opt_size, remaining, &opts->addr,  in mptcp_established_options_add_addr()
682 	len = mptcp_add_addr_len(opts->addr.family, echo, port);  in mptcp_established_options_add_addr()
689 		opts->suboptions = 0;  in mptcp_established_options_add_addr()
696 		opts->ahmac = 0;  in mptcp_established_options_add_addr()
699 	opts->suboptions |= OPTION_MPTCP_ADD_ADDR;  in mptcp_established_options_add_addr()
701 		opts->ahmac = add_addr_generate_hmac(msk->local_key,  in mptcp_established_options_add_addr()
703 						     &opts->addr);  in mptcp_established_options_add_addr()
706 		 opts->addr.id, opts->ahmac, echo, ntohs(opts->addr.port));  in mptcp_established_options_add_addr()
714 					      struct mptcp_out_options *opts)  in mptcp_established_options_rm_addr()  argument
732 	opts->suboptions |= OPTION_MPTCP_RM_ADDR;  in mptcp_established_options_rm_addr()
733 	opts->rm_list = rm_list;  in mptcp_established_options_rm_addr()
735 	for (i = 0; i < opts->rm_list.nr; i++)  in mptcp_established_options_rm_addr()
736 		pr_debug("rm_list_ids[%d]=%d", i, opts->rm_list.ids[i]);  in mptcp_established_options_rm_addr()
744 					      struct mptcp_out_options *opts)  in mptcp_established_options_mp_prio()  argument
753 	      OPTION_MPTCP_MPC_ACK) & opts->suboptions))  in mptcp_established_options_mp_prio()
761 	opts->suboptions |= OPTION_MPTCP_PRIO;  in mptcp_established_options_mp_prio()
762 	opts->backup = subflow->request_bkup;  in mptcp_established_options_mp_prio()
764 	pr_debug("prio=%d", opts->backup);  in mptcp_established_options_mp_prio()
772 						   struct mptcp_out_options *opts)  in mptcp_established_options_rst()  argument
780 	opts->suboptions |= OPTION_MPTCP_RST;  in mptcp_established_options_rst()
781 	opts->reset_transient = subflow->reset_transient;  in mptcp_established_options_rst()
782 	opts->reset_reason = subflow->reset_reason;  in mptcp_established_options_rst()
790 					      struct mptcp_out_options *opts)  in mptcp_established_options_mp_fail()  argument
801 	opts->suboptions |= OPTION_MPTCP_FAIL;  in mptcp_established_options_mp_fail()
802 	opts->fail_seq = subflow->map_seq;  in mptcp_established_options_mp_fail()
804 	pr_debug("MP_FAIL fail_seq=%llu", opts->fail_seq);  in mptcp_established_options_mp_fail()
811 			       struct mptcp_out_options *opts)  in mptcp_established_options()  argument
819 	opts->suboptions = 0;  in mptcp_established_options()
825 		if (mptcp_established_options_mp_fail(sk, &opt_size, remaining, opts)) {  in mptcp_established_options()
829 		if (mptcp_established_options_rst(sk, skb, &opt_size, remaining, opts)) {  in mptcp_established_options()
837 	if (mptcp_established_options_mp(sk, skb, snd_data_fin, &opt_size, remaining, opts))  in mptcp_established_options()
839 	else if (mptcp_established_options_dss(sk, skb, snd_data_fin, &opt_size, remaining, opts)) {  in mptcp_established_options()
841 		if (mptcp_established_options_mp_fail(sk, &opt_size, remaining, opts)) {  in mptcp_established_options()
856 	if (mptcp_established_options_add_addr(sk, skb, &opt_size, remaining, opts)) {  in mptcp_established_options()
860 	} else if (mptcp_established_options_rm_addr(sk, &opt_size, remaining, opts)) {  in mptcp_established_options()
866 	if (mptcp_established_options_mp_prio(sk, &opt_size, remaining, opts)) {  in mptcp_established_options()
876 			  struct mptcp_out_options *opts)  in mptcp_synack_options()  argument
881 		opts->suboptions = OPTION_MPTCP_MPC_SYNACK;  in mptcp_synack_options()
882 		opts->sndr_key = subflow_req->local_key;  in mptcp_synack_options()
883 		opts->csum_reqd = subflow_req->csum_reqd;  in mptcp_synack_options()
884 		opts->allow_join_id0 = subflow_req->allow_join_id0;  in mptcp_synack_options()
890 		opts->suboptions = OPTION_MPTCP_MPJ_SYNACK;  in mptcp_synack_options()
891 		opts->backup = subflow_req->backup;  in mptcp_synack_options()
892 		opts->join_id = subflow_req->local_id;  in mptcp_synack_options()
893 		opts->thmac = subflow_req->thmac;  in mptcp_synack_options()
894 		opts->nonce = subflow_req->local_nonce;  in mptcp_synack_options()
896 			 subflow_req, opts->backup, opts->join_id,  in mptcp_synack_options()
897 			 opts->thmac, opts->nonce);  in mptcp_synack_options()
1256 			 struct mptcp_out_options *opts)  in mptcp_write_options()  argument
1258 	if (unlikely(OPTION_MPTCP_FAIL & opts->suboptions)) {  in mptcp_write_options()
1268 		put_unaligned_be64(opts->fail_seq, ptr);  in mptcp_write_options()
1273 	if (unlikely(OPTION_MPTCP_RST & opts->suboptions)) {  in mptcp_write_options()
1276 				      opts->reset_transient,  in mptcp_write_options()
1277 				      opts->reset_reason);  in mptcp_write_options()
1284 	if (likely(OPTION_MPTCP_DSS & opts->suboptions)) {  in mptcp_write_options()
1285 		struct mptcp_ext *mpext = &opts->ext_copy;  in mptcp_write_options()
1309 			if (opts->csum_reqd)  in mptcp_write_options()
1330 			if (opts->csum_reqd) {  in mptcp_write_options()
1339 		    OPTION_MPTCP_MPC_ACK) & opts->suboptions) {  in mptcp_write_options()
1342 		if (OPTION_MPTCP_MPC_SYN & opts->suboptions) {  in mptcp_write_options()
1344 		} else if (OPTION_MPTCP_MPC_SYNACK & opts->suboptions) {  in mptcp_write_options()
1346 		} else if (opts->data_len) {  in mptcp_write_options()
1348 			if (opts->csum_reqd)  in mptcp_write_options()
1354 		if (opts->csum_reqd)  in mptcp_write_options()
1357 		if (!opts->allow_join_id0)  in mptcp_write_options()
1365 		    opts->suboptions))  in mptcp_write_options()
1368 		put_unaligned_be64(opts->sndr_key, ptr);  in mptcp_write_options()
1370 		if (!((OPTION_MPTCP_MPC_ACK) & opts->suboptions))  in mptcp_write_options()
1373 		put_unaligned_be64(opts->rcvr_key, ptr);  in mptcp_write_options()
1375 		if (!opts->data_len)  in mptcp_write_options()
1378 		if (opts->csum_reqd) {  in mptcp_write_options()
1379 			put_unaligned_be32(opts->data_len << 16 |  in mptcp_write_options()
1380 					   __mptcp_make_csum(opts->data_seq,  in mptcp_write_options()
1381 							     opts->subflow_seq,  in mptcp_write_options()
1382 							     opts->data_len,  in mptcp_write_options()
1383 							     opts->csum), ptr);  in mptcp_write_options()
1385 			put_unaligned_be32(opts->data_len << 16 |  in mptcp_write_options()
1392 	} else if (OPTION_MPTCP_MPJ_SYN & opts->suboptions) {  in mptcp_write_options()
1395 				      opts->backup, opts->join_id);  in mptcp_write_options()
1396 		put_unaligned_be32(opts->token, ptr);  in mptcp_write_options()
1398 		put_unaligned_be32(opts->nonce, ptr);  in mptcp_write_options()
1400 	} else if (OPTION_MPTCP_MPJ_SYNACK & opts->suboptions) {  in mptcp_write_options()
1403 				      opts->backup, opts->join_id);  in mptcp_write_options()
1404 		put_unaligned_be64(opts->thmac, ptr);  in mptcp_write_options()
1406 		put_unaligned_be32(opts->nonce, ptr);  in mptcp_write_options()
1408 	} else if (OPTION_MPTCP_MPJ_ACK & opts->suboptions) {  in mptcp_write_options()
1411 		memcpy(ptr, opts->hmac, MPTCPOPT_HMAC_LEN);  in mptcp_write_options()
1413 	} else if (OPTION_MPTCP_ADD_ADDR & opts->suboptions) {  in mptcp_write_options()
1418 		if (opts->addr.family == AF_INET6)  in mptcp_write_options()
1422 		if (opts->addr.port)  in mptcp_write_options()
1425 		if (opts->ahmac) {  in mptcp_write_options()
1426 			len += sizeof(opts->ahmac);  in mptcp_write_options()
1431 				      len, echo, opts->addr.id);  in mptcp_write_options()
1432 		if (opts->addr.family == AF_INET) {  in mptcp_write_options()
1433 			memcpy((u8 *)ptr, (u8 *)&opts->addr.addr.s_addr, 4);  in mptcp_write_options()
1437 		else if (opts->addr.family == AF_INET6) {  in mptcp_write_options()
1438 			memcpy((u8 *)ptr, opts->addr.addr6.s6_addr, 16);  in mptcp_write_options()
1443 		if (!opts->addr.port) {  in mptcp_write_options()
1444 			if (opts->ahmac) {  in mptcp_write_options()
1445 				put_unaligned_be64(opts->ahmac, ptr);  in mptcp_write_options()
1449 			u16 port = ntohs(opts->addr.port);  in mptcp_write_options()
1451 			if (opts->ahmac) {  in mptcp_write_options()
1456 				put_unaligned_be64(opts->ahmac, bptr);  in mptcp_write_options()
1471 	if (OPTION_MPTCP_PRIO & opts->suboptions) {  in mptcp_write_options()
1480 				      opts->backup, TCPOPT_NOP);  in mptcp_write_options()
1484 	if (OPTION_MPTCP_RM_ADDR & opts->suboptions) {  in mptcp_write_options()
1488 				      TCPOLEN_MPTCP_RM_ADDR_BASE + opts->rm_list.nr,  in mptcp_write_options()
1489 				      0, opts->rm_list.ids[0]);  in mptcp_write_options()
1491 		while (i < opts->rm_list.nr) {  in mptcp_write_options()
1494 			id1 = opts->rm_list.ids[i];  in mptcp_write_options()
1495 			id2 = i + 1 < opts->rm_list.nr ? opts->rm_list.ids[i + 1] : TCPOPT_NOP;  in mptcp_write_options()
1496 			id3 = i + 2 < opts->rm_list.nr ? opts->rm_list.ids[i + 2] : TCPOPT_NOP;  in mptcp_write_options()
1497 			id4 = i + 3 < opts->rm_list.nr ? opts->rm_list.ids[i + 3] : TCPOPT_NOP;  in mptcp_write_options()