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MdeModulePkg/Network: Add 32bit subnet mask support for IP4 PXE boot.

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This patch updates IP4 stack to support 32bit subnet mask in PXE boot process.
When 32bit subnet mask is used, the IP4 driver couldn't use the subnet mask to determine
whether destination IP address is on-link or not, so it will always try to send all the
packets to the destination IP address directly first, if failed it will continue
to try the default gateway.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Fu Siyuan <siyuan.fu@intel.com>
Reviewed-by: Ye Ting <ting.ye@intel.com>
Reviewed-by: Wu Jiaxin <jiaxin.wu@intel.com>
This commit is contained in:
Fu Siyuan
2018-08-28 09:48:32 +08:00
parent 1e57188216
commit 12ae56cf28
10 changed files with 164 additions and 34 deletions
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26
MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Route.c
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@@ -494,6 +494,11 @@ Ip4FindRouteEntry (
@param[in] RtTable The route table to search from
@param[in] Dest The destination address to search for
@param[in] Src The source address to search for
@param[in] SubnetMask The subnet mask of the Src address, this field is
used to check if the station is using /32 subnet.
@param[in] AlwaysTryDestAddr Always try to use the dest address as next hop even
though we can't find a matching route entry. This
field is only valid when using /32 subnet.
@return NULL if failed to route packet, otherwise a route cache
entry that can be used to route packet.
@@ -503,7 +508,9 @@ IP4_ROUTE_CACHE_ENTRY *
Ip4Route (
IN IP4_ROUTE_TABLE *RtTable,
IN IP4_ADDR Dest,
IN IP4_ADDR Src
IN IP4_ADDR Src,
IN IP4_ADDR SubnetMask,
IN BOOLEAN AlwaysTryDestAddr
)
{
LIST_ENTRY *Head;
@@ -535,7 +542,11 @@ Ip4Route (
RtEntry = Ip4FindRouteEntry (RtTable, Dest);
if (RtEntry == NULL) {
return NULL;
if (SubnetMask != IP4_ALLONE_ADDRESS) {
return NULL;
} else if (!AlwaysTryDestAddr) {
return NULL;
}
}
//
@@ -544,16 +555,23 @@ Ip4Route (
// network. Otherwise, it is an indirect route, the packet will be
// sent to the next hop router.
//
if ((RtEntry->Flag & IP4_DIRECT_ROUTE) != 0) {
// When using /32 subnet mask, the packet will always be sent to the direct
// destination first, if we can't find a matching route cache.
//
if (SubnetMask == IP4_ALLONE_ADDRESS || ((RtEntry->Flag & IP4_DIRECT_ROUTE) != 0)) {
NextHop = Dest;
} else {
NextHop = RtEntry->NextHop;
}
Ip4FreeRouteEntry (RtEntry);
if (RtEntry != NULL) {
Ip4FreeRouteEntry (RtEntry);
}
//
// Create a route cache entry, and tag it as spawned from this route entry
// For /32 subnet mask, the default route in RtEntry will be used if failed
// to send the packet to driect destination address.
//
RtCacheEntry = Ip4CreateRouteCacheEntry (Dest, Src, NextHop, (UINTN) RtEntry);