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https://github.com/lwip-tcpip/lwip.git
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44 lines
2.0 KiB
Plaintext
44 lines
2.0 KiB
Plaintext
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A simple routing table implementation for addition, deletion and lookup of IPv6 routes.
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APIs are:
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1) s8_t ip6_add_route_entry(struct ip6_prefix *ip6_prefix,
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struct netif *netif,
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ip6_addr_t *gateway,
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s8_t *index);
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2) err_t ip6_remove_route_entry(struct ip6_prefix *ip6_prefix);
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3) s8_t ip6_find_route_entry(ip6_addr_t *ip6_dest_addr);
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4) struct netif *ip6_static_route(ip6_addr_t *src, ip6_addr_t *dest);
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5) ip6_addr_t *ip6_get_gateway(struct netif *netif, ip6_addr_t *dest);
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6) struct ip6_route_entry *ip6_get_route_table(void);
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For route lookup from the table, The LWIP_HOOK_IP6_ROUTE hook in ip6_route(..) of ip6.c
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could be assigned to the ip6_static_route() API of this implementation to return the
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appropriate netif.
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-- The application can add routes using the API ip6_add_route_entry(..).
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This API adds the ip6 prefix route into the static route table while
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keeping all entries sorted in decreasing order of prefix length.
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Subsequently, a linear search down the list can be performed to retrieve a
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matching route entry for a Longest Prefix Match.
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The prefix length is expected to be at an 8-bit boundary. While this is
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a limitation, it would serve most practical purposes.
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-- The application can remove routes using the API ip6_remove_route_entry(..).
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-- The application can find a route entry for a specific address using the
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ip6_find_route_entry() function which returns the index of the found entry.
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This is used internally by the route lookup function ip6_static_route() API.
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-- To fetch the gateway IPv6 address for a specific destination IPv6
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address and target netif, the application can call ip6_get_gateway(..).
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This API could be assigned to the LWIP_HOOK_ND6_GET_GW() if a gateway has
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been added as part of the ip6_add_route_entry().
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-- To fetch a pointer to the head of the table, the application can call
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ip6_get_route_table().
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