audk/EdkModulePkg/Universal/Network/PxeBc/Dxe/pxe_bc_igmp.c

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/*++
Copyright (c) 2006 - 2007, Intel Corporation
All rights reserved. This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
--*/
#define RAND_MAX 0x10000
#include "Bc.h"
//
// Definitions for internet group management protocol version 2 message
// structure Per RFC 2236, November 1997
//
STATIC UINT8 RouterAlertOption[4] = { 0x80 | 20, 4, 0, 0 };
STATIC IPV4_ADDR AllRoutersGroup = { { 224, 0, 0, 2 } };
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
STATIC
VOID
ClearGroupTimer (
PXE_BASECODE_DEVICE *Private,
UINTN TimerId
)
{
if (Private == NULL) {
return ;
}
if (TimerId >= Private->MCastGroupCount) {
return ;
}
if (Private->IgmpGroupEvent[TimerId] == NULL) {
return ;
}
gBS->CloseEvent (Private->IgmpGroupEvent[TimerId]);
Private->IgmpGroupEvent[TimerId] = NULL;
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
STATIC
VOID
SetGroupTimer (
PXE_BASECODE_DEVICE *Private,
UINTN TimerId,
UINTN MaxRespTime
)
/*++
Routine description:
Set IGMP response timeout value.
Parameters:
Private := Pointer to PxeBc interface
TimerId := Timer ID#
MaxRespTime := Base response timeout value in tenths of seconds
Returns:
--*/
{
EFI_STATUS EfiStatus;
if (Private == NULL) {
return ;
}
if (TimerId >= Private->MCastGroupCount) {
return ;
}
if (Private->IgmpGroupEvent[TimerId] != NULL) {
gBS->CloseEvent (Private->IgmpGroupEvent[TimerId]);
}
EfiStatus = gBS->CreateEvent (
EVT_TIMER,
TPL_CALLBACK,
NULL,
NULL,
&Private->IgmpGroupEvent[TimerId]
);
if (EFI_ERROR (EfiStatus)) {
Private->IgmpGroupEvent[TimerId] = NULL;
return ;
}
EfiStatus = gBS->SetTimer (
Private->IgmpGroupEvent[TimerId],
TimerRelative,
MaxRespTime * 1000000 + Random (Private) % RAND_MAX
);
if (EFI_ERROR (EfiStatus)) {
gBS->CloseEvent (Private->IgmpGroupEvent[TimerId]);
Private->IgmpGroupEvent[TimerId] = NULL;
}
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
STATIC
VOID
SendIgmpMessage (
PXE_BASECODE_DEVICE *Private,
UINT8 Type,
INTN GroupId
)
/*++
Routine description:
Send an IGMP message
Parameters:
Private := Pointer to PxeBc interface
Type := Message type opcode
GroupId := Group ID#
Returns:
--*/
{
Private->IgmpMessage.Type = Type;
Private->IgmpMessage.MaxRespTime = 0;
Private->IgmpMessage.Checksum = 0;
Private->IgmpMessage.GroupAddress = Private->MCastGroup[GroupId];
Private->IgmpMessage.Checksum = IpChecksum (
(UINT16 *) &Private->IgmpMessage,
sizeof Private->IgmpMessage
);
Ipv4SendWOp (
Private,
0,
(UINT8 *) &Private->IgmpMessage,
sizeof Private->IgmpMessage,
PROT_IGMP,
RouterAlertOption,
sizeof RouterAlertOption,
((Type == IGMP_TYPE_LEAVE_GROUP) ? AllRoutersGroup.L : Private->IgmpMessage.GroupAddress),
EFI_PXE_BASE_CODE_FUNCTION_IGMP
);
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
STATIC
VOID
ReportIgmp (
PXE_BASECODE_DEVICE *Private,
INTN GroupId
)
/*++
Routine description:
Send an IGMP report message.
Parameters:
Private := Pointer to PxeBc interface
GroupId := Group ID#
Returns:
--*/
{
//
// if version 1 querier, send v1 report
//
UINT8 Type;
if (Private->Igmpv1TimeoutEvent != NULL) {
if (!EFI_ERROR (gBS->CheckEvent (Private->Igmpv1TimeoutEvent))) {
gBS->CloseEvent (Private->Igmpv1TimeoutEvent);
Private->Igmpv1TimeoutEvent = NULL;
Private->UseIgmpv1Reporting = TRUE;
}
}
Type = (UINT8) (Private->UseIgmpv1Reporting ? IGMP_TYPE_V1REPORT : IGMP_TYPE_REPORT);
SendIgmpMessage (Private, Type, GroupId);
ClearGroupTimer (Private, GroupId);
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
VOID
IgmpCheckTimers (
PXE_BASECODE_DEVICE *Private
)
/*++
Routine description:
Check IGMP timers and send reports for all groups that have expired.
Parameters:
Private := Pointer to PxeBc interface
Returns:
--*/
{
UINTN GroupId;
if (Private == NULL) {
return ;
}
for (GroupId = 0; GroupId < Private->MCastGroupCount; ++GroupId) {
if (Private->IgmpGroupEvent[GroupId] == NULL) {
continue;
}
if (!EFI_ERROR (gBS->CheckEvent (Private->IgmpGroupEvent[GroupId]))) {
//
// send a report
//
ReportIgmp (Private, GroupId);
}
}
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
STATIC
INTN
FindMulticastGroup (
PXE_BASECODE_DEVICE *Private,
UINT32 GroupAddress
)
/*++
Routine description:
Fund group ID# (index).
Parameters:
Private := Pointer to PxeBc interface
GroupAddress := Group multicast address
Returns:
0 := Group not found
other := Group ID#
--*/
{
UINTN GroupId;
for (GroupId = 0; GroupId < Private->MCastGroupCount; ++GroupId) {
if (Private->MCastGroup[GroupId] == GroupAddress) {
return GroupId + 1;
}
}
return 0;
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
VOID
IgmpJoinGroup (
PXE_BASECODE_DEVICE *Private,
EFI_IP_ADDRESS *GroupPtr
)
/*++
Routine description:
Join multicast group.
Parameters:
Private := Pointer to PxeBc interface
GroupPtr := Pointer to group mutlicast IP address.
Returns:
--*/
{
UINT32 Grp;
Grp = *(UINT32 *) GroupPtr;
//
// see if we already have it or if we can't take anymore
//
if (FindMulticastGroup (Private, Grp) || Private->MCastGroupCount == MAX_MCAST_GROUPS) {
return ;
}
//
// add the group
//
Private->MCastGroup[Private->MCastGroupCount] = Grp;
ReportIgmp (Private, Private->MCastGroupCount);
//
// send a report
// so it will get sent again per RFC 2236
//
SetGroupTimer (
Private,
Private->MCastGroupCount++,
UNSOLICITED_REPORT_INTERVAL * 10
);
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
VOID
IgmpLeaveGroup (
PXE_BASECODE_DEVICE *Private,
EFI_IP_ADDRESS *GroupPtr
)
/*++
Routine description:
Leave multicast group.
Parameters:
Private := Pointer to PxeBc interface
GroupPtr := Mutlicast group IP address.
Returns:
--*/
{
UINT32 Grp;
UINTN GroupId;
Grp = *(UINT32 *) GroupPtr;
//
// if not in group, ignore
//
GroupId = FindMulticastGroup (Private, Grp);
if (GroupId == 0) {
return ;
}
//
// if not v1 querrier, send leave group IGMP message
//
if (Private->Igmpv1TimeoutEvent != NULL) {
if (!EFI_ERROR (gBS->CheckEvent (Private->Igmpv1TimeoutEvent))) {
gBS->CloseEvent (Private->Igmpv1TimeoutEvent);
Private->Igmpv1TimeoutEvent = NULL;
Private->UseIgmpv1Reporting = TRUE;
} else {
SendIgmpMessage (Private, IGMP_TYPE_LEAVE_GROUP, GroupId - 1);
}
}
while (GroupId < Private->MCastGroupCount) {
Private->MCastGroup[GroupId - 1] = Private->MCastGroup[GroupId];
Private->IgmpGroupEvent[GroupId - 1] = Private->IgmpGroupEvent[GroupId];
++GroupId;
}
--Private->MCastGroupCount;
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
VOID
HandleIgmp (
PXE_BASECODE_DEVICE *Private,
IGMPV2_MESSAGE *IgmpMessagePtr,
UINTN IgmpLength
)
/*++
Routine description:
Handle received IGMP packet
Parameters:
Private := Pointer to PxeBc interface
IgmpMessagePtr := Pointer to IGMP packet
IgmpLength := packet length in bytes
Returns:
--*/
{
EFI_STATUS EfiStatus;
UINTN GroupId;
INTN MaxRespTime;
if (Private == NULL) {
return ;
}
if (Private->MCastGroupCount == 0) {
//
// if we don't belong to any multicast groups, ignore
//
return ;
}
//
// verify checksum
//
if (IpChecksum ((UINT16 *) IgmpMessagePtr, IgmpLength)) {
//
// bad checksum - ignore packet
//
return ;
}
switch (IgmpMessagePtr->Type) {
case IGMP_TYPE_QUERY:
//
// if a version 1 querier, note the fact and set max resp time
//
MaxRespTime = IgmpMessagePtr->MaxRespTime;
if (MaxRespTime == 0) {
Private->UseIgmpv1Reporting = TRUE;
if (Private->Igmpv1TimeoutEvent != NULL) {
gBS->CloseEvent (Private->Igmpv1TimeoutEvent);
}
EfiStatus = gBS->CreateEvent (
EVT_TIMER,
TPL_CALLBACK,
NULL,
NULL,
&Private->Igmpv1TimeoutEvent
);
if (EFI_ERROR (EfiStatus)) {
Private->Igmpv1TimeoutEvent = NULL;
} else {
EfiStatus = gBS->SetTimer (
Private->Igmpv1TimeoutEvent,
TimerRelative,
(UINT64) V1ROUTER_PRESENT_TIMEOUT * 10000000
);
}
MaxRespTime = IGMP_DEFAULT_MAX_RESPONSE_TIME * 10;
}
//
// if a general query (!GroupAddress), set all our group timers
//
if (!IgmpMessagePtr->GroupAddress) {
for (GroupId = 0; GroupId < Private->MCastGroupCount; ++GroupId) {
SetGroupTimer (Private, GroupId, MaxRespTime);
}
} else {
//
// specific query - set only specific group
//
GroupId = FindMulticastGroup (Private, IgmpMessagePtr->GroupAddress);
if (GroupId != 0) {
SetGroupTimer (Private, GroupId - 1, MaxRespTime);
}
}
break;
//
// if we have a timer running for this group, clear it
//
case IGMP_TYPE_V1REPORT:
case IGMP_TYPE_REPORT:
GroupId = FindMulticastGroup (Private, IgmpMessagePtr->GroupAddress);
if (GroupId != 0) {
ClearGroupTimer (Private, GroupId - 1);
}
break;
}
}
/* EOF - pxe_bc_igmp.c */