mirror of https://github.com/ARMmbed/mbed-os.git
79 lines
3.3 KiB
C
79 lines
3.3 KiB
C
/*
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* Copyright (c) 2013-2017, Arm Limited and affiliates.
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef _IPV6_H
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#define _IPV6_H
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#include "Core/include/ns_buffer.h"
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#include "Common_Protocols/ipv6_constants.h"
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extern uint16_t ipv6_header_size_required(buffer_t *buf);
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extern uint16_t ipv6_max_unfragmented_payload(buffer_t *buf, uint16_t mtu_limit);
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extern uint16_t ipv6_mtu(buffer_t *buf);
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extern buffer_routing_info_t *ipv6_buffer_route_to(buffer_t *buf, const uint8_t *next_hop, struct protocol_interface_info_entry *next_if);
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extern buffer_routing_info_t *ipv6_buffer_route(buffer_t *buf);
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typedef enum ipv6_exthdr_stage {
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IPV6_EXTHDR_SIZE,
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IPV6_EXTHDR_INSERT,
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IPV6_EXTHDR_MODIFY
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} ipv6_exthdr_stage_t;
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#define IPV6_EXTHDR_MODIFY_TUNNEL 1
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/* Hooks for routing code to insert/modify IPv6 extension headers.
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*
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* IPV6_EXTHDR_SIZE: buffer not yet fully formed, but we know the final
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* destination. Can perform routing decision. Call should set result to total size
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* of extension header that would be inserted by IPV6_EXTHDR_INSERT.
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*
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* IPV6_EXTHDR_INSERT: we are about to add IP header - provider can
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* prepend extension headers, and modify options.type to new outer NH.
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* (We do not support extension headers from more than one source per packet).
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* These headers can be placeholders, with filling deferred until
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* IPV6_EXTHDR_MODIFY. If a source routing header is inserted, buffer dst_sa
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* should be changed from final destination to next IP destination.
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* XXX no - won't work. Separate mechanism for varying IP dest?
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*
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* IPV6_EXTHDR_MODIFY: the buffer contains an existing complete IP packet,
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* possibly generated internally, and possibly received externally. Provider
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* can update fields in extension headers it knows.
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*
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* If it needs to insert headers that are not present, it can force insertion
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* into a tunnel, by:
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* setting dst_sa and src_sa appropriate for the tunnel endpoints
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* XXX does this work out okay with dest cache and PMTU?
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* updating route info like next hop if necessary (probably not)
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* returning IPV6_EXTHDR_MODIFY_TUNNEL
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* During new header formation for the tunnel, IPV6_EXTHDR_INSERT will be
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* called again, and obviously it must ensure headers are inserted so that
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* IPV6_EXTHDR_MODIFY doesn't request to tunnel a second time.
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*
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* In all cases, a negative value in result indicates error.
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*/
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typedef buffer_t *ipv6_exthdr_provider_fn_t(buffer_t *buf, ipv6_exthdr_stage_t stage, int16_t *result);
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void ipv6_set_exthdr_provider(ipv6_route_src_t src, ipv6_exthdr_provider_fn_t *fn);
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extern buffer_t *ipv6_down(buffer_t *buf);
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extern buffer_t *ipv6_forwarding_down(buffer_t *buf);
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extern buffer_t *ipv6_forwarding_up(buffer_t *buf);
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void ipv6_transmit_multicast_on_interface(buffer_t *buf, struct protocol_interface_info_entry *cur);
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#endif /* _IPV6_H */
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