15f6e1d7a3
This commit changes the method of accessing the default v6 prefix. Instead of always using `UIP_DS6_DEFAULT_PREFIX`, we store the default prefix in a variable. We subsequently retrieve the prefix by calling `uip_ds6_default_prefix()`. `uip_ds6_init()` will set this variable to the value of `UIP_DS6_DEFAULT_PREFIX`, but only if the startup code has not set a different default prefix before `uip_ds6_init()` gets called. This approach has the following benefits: * It allows us to change the default prefix at run time. * It allows the startup code to set a prefix different than the one specified by `UIP_DS6_DEFAULT_PREFIX`, which can be useful if the default prefix comes from a different source (e.g. the command line for native, or a configuration stored on a node's flash) * In many places the current code assumes that the prefix contains 6 bytes of zeros (e.g. `FDxx::/64`). Changing to a different prefix (e.g. `FD00:ABCD::`) would need extensive code changes. This change here makes it easy to use a prefix of any length.
179 lines
6.0 KiB
C
179 lines
6.0 KiB
C
/*
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* Copyright (c) 2017, RISE SICS.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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*/
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/**
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* \file
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* Routing driver header file
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* \author
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* Simon Duquennoy <simon.duquennoy@ri.se>
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*/
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#ifndef ROUTING_H_
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#define ROUTING_H_
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#include "contiki.h"
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#include "net/ipv6/uip.h"
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#include "net/ipv6/uip-ds6-nbr.h"
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#include "net/ipv6/uip-ds6-route.h"
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#include "net/ipv6/uip-sr.h"
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#include "net/linkaddr.h"
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/**
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* The structure of a routing protocol driver.
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*/
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struct routing_driver {
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char *name;
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/** Initialize the routing protocol */
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void (* init)(void);
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/**
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* Set the prefix, for nodes that will operate as root
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*
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* \param prefix The prefix. If NULL, uip_ds6_default_prefix() is used instead
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* \param iid The IID. If NULL, it will be built from uip_ds6_set_addr_iid.
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*/
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void (* root_set_prefix)(uip_ipaddr_t *prefix, uip_ipaddr_t *iid);
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/**
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* Set the node as root and start a network
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*
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* \return 0 in case of success, -1 otherwise
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*/
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int (* root_start)(void);
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/**
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* Tells whether the node is a network root or not
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*
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* \return 1 if we are root, 0 otherwise
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*/
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int (* node_is_root)(void);
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/**
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* Returns the IPv6 address of the network root, if any
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*
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* \param ipaddr A pointer where to copy the IP address of the root
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* \return 1 if the root address was copied, 0 otherwise
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*/
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int (* get_root_ipaddr)(uip_ipaddr_t *ipaddr);
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/**
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* Returns the global IPv6 address of a source routing node
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*
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* \param ipaddr A pointer where to copy the IP address of the node
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* \param node The source routing node
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* \return 1 if the global node address was copied, 0 otherwise
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*/
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int (* get_sr_node_ipaddr)(uip_ipaddr_t *addr, const uip_sr_node_t *node);
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/**
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* Leave the network the node is part of
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*
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*/
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void (* leave_network)(void);
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/**
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* Tells whether the node is currently part of a network
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*
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* \return 1 if we have joined a network, 0 otherwise.
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*/
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int (* node_has_joined)(void);
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/**
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* Tells whether the node is currently reachable as part of the network
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*
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* \return 1 if we are reachable, 0 otherwise.
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*/
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int (* node_is_reachable)(void);
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/**
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* Triggers a global topology repair
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*
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* \param str A textual description of the cause for triggering a repair
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*/
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void (* global_repair)(const char *str);
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/**
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* Triggers a RPL local topology repair
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*
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* \param str A textual description of the cause for triggering a repair
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*/
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void (* local_repair)(const char *str);
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/**
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* Removes all extension headers that pertain to the routing protocol.
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*/
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void (* ext_header_remove)(void);
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/**
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* Adds/updates routing protocol extension headers to current uIP packet.
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*
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* \return 1 in case of success, 0 otherwise
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*/
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int (* ext_header_update)(void);
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/**
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* Process and update the routing protocol hob-by-hop
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* extention headers of the current uIP packet.
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*
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* \param ext_buf A pointer to the ext header buffer
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* \param opt_offset The offset within the extension header where
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* the option starts
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* \return 1 in case the packet is valid and to be processed further,
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* 0 in case the packet must be dropped.
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*/
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int (* ext_header_hbh_update)(uint8_t *ext_buf, int opt_offset);
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/**
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* Process and update SRH in-place,
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* i.e. internal address swapping as per RFC6554
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* \return 1 if SRH found, 0 otherwise
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*/
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int (* ext_header_srh_update)(void);
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/**
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* Look for next hop from SRH of current uIP packet.
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*
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* \param ipaddr A pointer to the address where to store the next hop.
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* \return 1 if a next hop was found, 0 otherwise
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*/
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int (* ext_header_srh_get_next_hop)(uip_ipaddr_t *ipaddr);
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/**
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* Called by lower layers after every packet transmission
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*
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* \param addr The link-layer addrress of the packet destination
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* \param status The transmission status (see os/net/mac/mac.h)
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* \param numtx The total number of transmission attempts
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*/
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void (* link_callback)(const linkaddr_t *addr, int status, int numtx);
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/**
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* Called by uIP to notify addition/removal of IPv6 neighbor entries
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*
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* \param addr The link-layer addrress of the packet destination
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* \param status The transmission status (see os/net/mac/mac.h)
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* \param numtx The total number of transmission attempts
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*/
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void (* neighbor_state_changed)(uip_ds6_nbr_t *nbr);
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/**
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* Called by uIP if it has decided to drop a route because
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*
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* \param route The route that will be dropped after this function returns
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*/
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void (* drop_route)(uip_ds6_route_t *route);
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};
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#endif /* ROUTING_H_ */
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