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apps/netutils/netlib:  netlib_ipv[4|6]adaptor() will now use the new routing table interfaces if they are available:  If the desination IP address does not correspond to the network served by any device, then the address of the router that should get us to the correct sub-net is is determined.  Then the network adaptor that can communicate with the that router has the IP address that will returned.

    apps/netutils/netlib:  Add new utilities netlib_ipv[4|6]router() that can be used to determine the IP address of a router that would be used some some destination IP address that is not locally accessible.

    apps/netutils/netlib:  Add helpers for reading the routing table:  netlib_read_ipv4route() and netlib_read_ipv6route()
This commit is contained in:
Gregory Nutt
2017-09-20 10:35:56 -06:00
parent fb804e3498
commit dc5be379a9
8 changed files with 933 additions and 10 deletions
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81
netutils/netlib/netlib_ipv6adaptor.c
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@@ -53,11 +53,11 @@
#ifdef CONFIG_NET_IPv6
/****************************************************************************
* Public Functions
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: netlib_ipv6adaptor
* Name: _netlib_ipv6adaptor
*
* Description:
* Given the destination address, destipaddr, return the IP address
@@ -68,15 +68,15 @@
* appear in the routing table. A complete solution could involve three
* steps:
*
* 1. Call netlib_ipv4adaptor() to find the address of the network
* 1. Call netlib_ipv6adaptor() to find the address of the network
* adaptor for the destination address.
* 2. If this fails, then look up the router address in the routing table
* that can forward to the destination address, then
* 3. Call netlib_ipv4adaptor() to find the address of the network
* 3. Call netlib_ipv6adaptor() to find the address of the network
* adaptor for that router address.
*
* Input Parameters:
* destipaddr - The destination IPv4 address
* destipaddr - The destination IPv6 address
* srcipaddr - The location to return that adaptor address that serves
* the sub-net that includes the destination address.
*
@@ -87,8 +87,8 @@
*
****************************************************************************/
int netlib_ipv6adaptor(FAR const struct in6_addr *destipaddr,
FAR struct in6_addr *srcipaddr)
static int _netlib_ipv6adaptor(FAR const struct in6_addr *destipaddr,
FAR struct in6_addr *srcipaddr)
{
FAR struct lifreq *lifr;
struct lifconf lifc;
@@ -213,4 +213,71 @@ errout_with_sd:
return ret;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: netlib_ipv6adaptor
*
* Description:
* Given the destination address, destipaddr, return the IP address
* assigned to the network adaptor that connects the sub-net that
* includes destipaddr.
*
* If routing table support is enabled, then this logic will account for
* the case where the destination address is not locally accessible. In
* this case, it will return the IP address of the network adaptor that
* provides the correct router to handle that destination address.
*
* Input Parameters:
* destipaddr - The destination IPv6 address
* srcipaddr - The location to return that adaptor address that serves
* the sub-net that includes the destination address.
*
* Returned Value:
* Zero (OK) is returned on success with srcipaddr valid. A negated
* errno value is returned on any failure and in this case the srcipaddr
* is not valid.
*
****************************************************************************/
int netlib_ipv6adaptor(FAR const struct in6_addr *destipaddr,
FAR struct in6_addr *srcipaddr)
{
int ret;
DEBUGASSERT(destipaddr != NULL && srcipaddr != NULL);
ret = _netlib_ipv6adaptor(destipaddr, srcipaddr);
#ifdef HAVE_ROUTE_PROCFS
if (ret < 0)
{
struct in6_addr router;
/* If the first adaptor look-up on the the destination IP address
* failed, then the IP address cannot be sent on any of the
* currently up network devices configured with an IPv6 address.
*
* But perhaps the destination address is on a sub-net that is
* accessible on a router that can be reached through a local
* network adaptor?
*/
ret = netlib_ipv6router(destipaddr, &router);
if (ret >= 0)
{
/* Yes... try again using the router address as the destination
* address.
*/
ret = _netlib_ipv6adaptor(&router, srcipaddr);
}
}
#endif
return ret;
}
#endif /* CONFIG_NET_IPv6 */