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audk/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Input.c

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/** @file
IP4 input process.
Copyright (c) 2005 - 2009, Intel Corporation.<BR>
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.
**/
#include "Ip4Impl.h"
/**
Create an empty assemble entry for the packet identified by
(Dst, Src, Id, Protocol). The default life for the packet is
120 seconds.
@param[in] Dst The destination address
@param[in] Src The source address
@param[in] Id The ID field in IP header
@param[in] Protocol The protocol field in IP header
@return NULL if failed to allocate memory for the entry, otherwise
the point to just created reassemble entry.
**/
IP4_ASSEMBLE_ENTRY *
Ip4CreateAssembleEntry (
IN IP4_ADDR Dst,
IN IP4_ADDR Src,
IN UINT16 Id,
IN UINT8 Protocol
)
{
IP4_ASSEMBLE_ENTRY *Assemble;
Assemble = AllocatePool (sizeof (IP4_ASSEMBLE_ENTRY));
if (Assemble == NULL) {
return NULL;
}
InitializeListHead (&Assemble->Link);
InitializeListHead (&Assemble->Fragments);
Assemble->Dst = Dst;
Assemble->Src = Src;
Assemble->Id = Id;
Assemble->Protocol = Protocol;
Assemble->TotalLen = 0;
Assemble->CurLen = 0;
Assemble->Head = NULL;
Assemble->Info = NULL;
Assemble->Life = IP4_FRAGMENT_LIFE;
return Assemble;
}
/**
Release all the fragments of a packet, then free the assemble entry.
@param[in] Assemble The assemble entry to free
**/
VOID
Ip4FreeAssembleEntry (
IN IP4_ASSEMBLE_ENTRY *Assemble
)
{
LIST_ENTRY *Entry;
LIST_ENTRY *Next;
NET_BUF *Fragment;
NET_LIST_FOR_EACH_SAFE (Entry, Next, &Assemble->Fragments) {
Fragment = NET_LIST_USER_STRUCT (Entry, NET_BUF, List);
RemoveEntryList (Entry);
NetbufFree (Fragment);
}
gBS->FreePool (Assemble);
}
/**
Initialize an already allocated assemble table. This is generally
the assemble table embedded in the IP4 service instance.
@param[in, out] Table The assemble table to initialize.
**/
VOID
Ip4InitAssembleTable (
IN OUT IP4_ASSEMBLE_TABLE *Table
)
{
UINT32 Index;
for (Index = 0; Index < IP4_ASSEMLE_HASH_SIZE; Index++) {
InitializeListHead (&Table->Bucket[Index]);
}
}
/**
Clean up the assemble table: remove all the fragments
and assemble entries.
@param[in] Table The assemble table to clean up
**/
VOID
Ip4CleanAssembleTable (
IN IP4_ASSEMBLE_TABLE *Table
)
{
LIST_ENTRY *Entry;
LIST_ENTRY *Next;
IP4_ASSEMBLE_ENTRY *Assemble;
UINT32 Index;
for (Index = 0; Index < IP4_ASSEMLE_HASH_SIZE; Index++) {
NET_LIST_FOR_EACH_SAFE (Entry, Next, &Table->Bucket[Index]) {
Assemble = NET_LIST_USER_STRUCT (Entry, IP4_ASSEMBLE_ENTRY, Link);
RemoveEntryList (Entry);
Ip4FreeAssembleEntry (Assemble);
}
}
}
/**
Trim the packet to fit in [Start, End), and update the per
packet information.
@param Packet Packet to trim
@param Start The sequence of the first byte to fit in
@param End One beyond the sequence of last byte to fit in.
**/
VOID
Ip4TrimPacket (
IN OUT NET_BUF *Packet,
IN INTN Start,
IN INTN End
)
{
IP4_CLIP_INFO *Info;
INTN Len;
Info = IP4_GET_CLIP_INFO (Packet);
ASSERT (Info->Start + Info->Length == Info->End);
ASSERT ((Info->Start < End) && (Start < Info->End));
if (Info->Start < Start) {
Len = Start - Info->Start;
NetbufTrim (Packet, (UINT32) Len, NET_BUF_HEAD);
Info->Start = Start;
Info->Length -= Len;
}
if (End < Info->End) {
Len = End - Info->End;
NetbufTrim (Packet, (UINT32) Len, NET_BUF_TAIL);
Info->End = End;
Info->Length -= Len;
}
}
/**
Release all the fragments of the packet. This is the callback for
the assembled packet's OnFree. It will free the assemble entry,
which in turn will free all the fragments of the packet.
@param[in] Arg The assemble entry to free
**/
VOID
Ip4OnFreeFragments (
IN VOID *Arg
)
{
Ip4FreeAssembleEntry ((IP4_ASSEMBLE_ENTRY *) Arg);
}
/**
Reassemble the IP fragments. If all the fragments of the packet
have been received, it will wrap the packet in a net buffer then
return it to caller. If the packet can't be assembled, NULL is
return.
@param Table The assemble table used. New assemble entry will be created
if the Packet is from a new chain of fragments.
@param Packet The fragment to assemble. It might be freed if the fragment
can't be re-assembled.
@return NULL if the packet can't be reassemble. The point to just assembled
packet if all the fragments of the packet have arrived.
**/
NET_BUF *
Ip4Reassemble (
IN OUT IP4_ASSEMBLE_TABLE *Table,
IN OUT NET_BUF *Packet
)
{
IP4_HEAD *IpHead;
IP4_CLIP_INFO *This;
IP4_CLIP_INFO *Node;
IP4_ASSEMBLE_ENTRY *Assemble;
LIST_ENTRY *Head;
LIST_ENTRY *Prev;
LIST_ENTRY *Cur;
NET_BUF *Fragment;
NET_BUF *NewPacket;
INTN Index;
IpHead = Packet->Ip;
This = IP4_GET_CLIP_INFO (Packet);
ASSERT (IpHead != NULL);
//
// First: find the related assemble entry
//
Assemble = NULL;
Index = IP4_ASSEMBLE_HASH (IpHead->Dst, IpHead->Src, IpHead->Id, IpHead->Protocol);
NET_LIST_FOR_EACH (Cur, &Table->Bucket[Index]) {
Assemble = NET_LIST_USER_STRUCT (Cur, IP4_ASSEMBLE_ENTRY, Link);
if ((Assemble->Dst == IpHead->Dst) && (Assemble->Src == IpHead->Src) &&
(Assemble->Id == IpHead->Id) && (Assemble->Protocol == IpHead->Protocol)) {
break;
}
}
//
// Create a new assemble entry if no assemble entry is related to this packet
//
if (Cur == &Table->Bucket[Index]) {
Assemble = Ip4CreateAssembleEntry (
IpHead->Dst,
IpHead->Src,
IpHead->Id,
IpHead->Protocol
);
if (Assemble == NULL) {
goto DROP;
}
InsertHeadList (&Table->Bucket[Index], &Assemble->Link);
}
//
// Assemble shouldn't be NULL here
//
ASSERT (Assemble != NULL);
//
// Find the point to insert the packet: before the first
// fragment with THIS.Start < CUR.Start. the previous one
// has PREV.Start <= THIS.Start < CUR.Start.
//
Head = &Assemble->Fragments;
NET_LIST_FOR_EACH (Cur, Head) {
Fragment = NET_LIST_USER_STRUCT (Cur, NET_BUF, List);
if (This->Start < IP4_GET_CLIP_INFO (Fragment)->Start) {
break;
}
}
//
// Check whether the current fragment overlaps with the previous one.
// It holds that: PREV.Start <= THIS.Start < THIS.End. Only need to
// check whether THIS.Start < PREV.End for overlap. If two fragments
// overlaps, trim the overlapped part off THIS fragment.
//
if ((Prev = Cur->ForwardLink) != Head) {
Fragment = NET_LIST_USER_STRUCT (Prev, NET_BUF, List);
Node = IP4_GET_CLIP_INFO (Fragment);
if (This->Start < Node->End) {
if (This->End <= Node->End) {
NetbufFree (Packet);
return NULL;
}
Ip4TrimPacket (Packet, Node->End, This->End);
}
}
//
// Insert the fragment into the packet. The fragment may be removed
// from the list by the following checks.
//
NetListInsertBefore (Cur, &Packet->List);
//
// Check the packets after the insert point. It holds that:
// THIS.Start <= NODE.Start < NODE.End. The equality holds
// if PREV and NEXT are continuous. THIS fragment may fill
// several holes. Remove the completely overlapped fragments
//
while (Cur != Head) {
Fragment = NET_LIST_USER_STRUCT (Cur, NET_BUF, List);
Node = IP4_GET_CLIP_INFO (Fragment);
//
// Remove fragments completely overlapped by this fragment
//
if (Node->End <= This->End) {
Cur = Cur->ForwardLink;
RemoveEntryList (&Fragment->List);
Assemble->CurLen -= Node->Length;
NetbufFree (Fragment);
continue;
}
//
// The conditions are: THIS.Start <= NODE.Start, and THIS.End <
// NODE.End. Two fragments overlaps if NODE.Start < THIS.End.
// If two fragments start at the same offset, remove THIS fragment
// because ((THIS.Start == NODE.Start) && (THIS.End < NODE.End)).
//
if (Node->Start < This->End) {
if (This->Start == Node->Start) {
RemoveEntryList (&Packet->List);
goto DROP;
}
Ip4TrimPacket (Packet, This->Start, Node->Start);
}
break;
}
//
// Update the assemble info: increase the current length. If it is
// the frist fragment, update the packet's IP head and per packet
// info. If it is the last fragment, update the total length.
//
Assemble->CurLen += This->Length;
if (This->Start == 0) {
//
// Once the first fragment is enqueued, it can't be removed
// from the fragment list. So, Assemble->Head always point
// to valid memory area.
//
ASSERT (Assemble->Head == NULL);
Assemble->Head = IpHead;
Assemble->Info = IP4_GET_CLIP_INFO (Packet);
}
//
// Don't update the length more than once.
//
if (IP4_LAST_FRAGMENT (IpHead->Fragment) && (Assemble->TotalLen == 0)) {
Assemble->TotalLen = This->End;
}
//
// Deliver the whole packet if all the fragments received.
// All fragments received if:
// 1. received the last one, so, the total length is know
// 2. received all the data. If the last fragment on the
// queue ends at the total length, all data is received.
//
if ((Assemble->TotalLen != 0) && (Assemble->CurLen >= Assemble->TotalLen)) {
RemoveEntryList (&Assemble->Link);
//
// If the packet is properly formated, the last fragment's End
// equals to the packet's total length. Otherwise, the packet
// is a fake, drop it now.
//
Fragment = NET_LIST_USER_STRUCT (Head->BackLink, NET_BUF, List);
if (IP4_GET_CLIP_INFO (Fragment)->End != Assemble->TotalLen) {
Ip4FreeAssembleEntry (Assemble);
return NULL;
}
//
// Wrap the packet in a net buffer then deliver it up
//
NewPacket = NetbufFromBufList (
&Assemble->Fragments,
0,
0,
Ip4OnFreeFragments,
Assemble
);
if (NewPacket == NULL) {
Ip4FreeAssembleEntry (Assemble);
return NULL;
}
NewPacket->Ip = Assemble->Head;
CopyMem (IP4_GET_CLIP_INFO (NewPacket), Assemble->Info, sizeof (*IP4_GET_CLIP_INFO (NewPacket)));
return NewPacket;
}
return NULL;
DROP:
NetbufFree (Packet);
return NULL;
}
/**
The IP4 input routine. It is called by the IP4_INTERFACE when a
IP4 fragment is received from MNP.
@param[in] Ip4Instance The IP4 child that request the receive, most like
it is NULL.
@param[in] Packet The IP4 packet received.
@param[in] IoStatus The return status of receive request.
@param[in] Flag The link layer flag for the packet received, such
as multicast.
@param[in] Context The IP4 service instance that own the MNP.
**/
VOID
Ip4AccpetFrame (
IN IP4_PROTOCOL *Ip4Instance,
IN NET_BUF *Packet,
IN EFI_STATUS IoStatus,
IN UINT32 Flag,
IN VOID *Context
)
{
IP4_SERVICE *IpSb;
IP4_CLIP_INFO *Info;
IP4_HEAD *Head;
UINT32 HeadLen;
UINT32 OptionLen;
UINT32 TotalLen;
UINT16 Checksum;
IpSb = (IP4_SERVICE *) Context;
if (EFI_ERROR (IoStatus) || (IpSb->State == IP4_SERVICE_DESTORY)) {
goto DROP;
}
//
// Check that the IP4 header is correctly formatted
//
if (Packet->TotalSize < IP4_MIN_HEADLEN) {
goto RESTART;
}
Head = (IP4_HEAD *) NetbufGetByte (Packet, 0, NULL);
HeadLen = (Head->HeadLen << 2);
TotalLen = NTOHS (Head->TotalLen);
//
// Mnp may deliver frame trailer sequence up, trim it off.
//
if (TotalLen < Packet->TotalSize) {
NetbufTrim (Packet, Packet->TotalSize - TotalLen, FALSE);
}
if ((Head->Ver != 4) || (HeadLen < IP4_MIN_HEADLEN) ||
(TotalLen < HeadLen) || (TotalLen != Packet->TotalSize)) {
goto RESTART;
}
//
// Some OS may send IP packets without checksum.
//
Checksum = (UINT16) (~NetblockChecksum ((UINT8 *) Head, HeadLen));
if ((Head->Checksum != 0) && (Checksum != 0)) {
goto RESTART;
}
//
// Convert the IP header to host byte order, then get the per packet info.
//
Packet->Ip = Ip4NtohHead (Head);
Info = IP4_GET_CLIP_INFO (Packet);
Info->LinkFlag = Flag;
Info->CastType = Ip4GetHostCast (IpSb, Head->Dst, Head->Src);
Info->Start = (Head->Fragment & IP4_HEAD_OFFSET_MASK) << 3;
Info->Length = Head->TotalLen - HeadLen;
Info->End = Info->Start + Info->Length;
Info->Status = EFI_SUCCESS;
//
// The packet is destinated to us if the CastType is non-zero.
//
if ((Info->CastType == 0) || (Info->End > IP4_MAX_PACKET_SIZE)) {
goto RESTART;
}
//
// Validate the options. Don't call the Ip4OptionIsValid if
// there is no option to save some CPU process.
//
OptionLen = HeadLen - IP4_MIN_HEADLEN;
if ((OptionLen > 0) && !Ip4OptionIsValid ((UINT8 *) (Head + 1), OptionLen, TRUE)) {
goto RESTART;
}
//
// Trim the head off, after this point, the packet is headless.
// and Packet->TotalLen == Info->Length.
//
NetbufTrim (Packet, HeadLen, TRUE);
//
// Reassemble the packet if this is a fragment. The packet is a
// fragment if its head has MF (more fragment) set, or it starts
// at non-zero byte.
//
if (((Head->Fragment & IP4_HEAD_MF_MASK) != 0) || (Info->Start != 0)) {
//
// Drop the fragment if DF is set but it is fragmented. Gateway
// need to send a type 4 destination unreache ICMP message here.
//
if ((Head->Fragment & IP4_HEAD_DF_MASK) != 0) {
goto RESTART;
}
//
// The length of all but the last fragments is in the unit of 8 bytes.
//
if (((Head->Fragment & IP4_HEAD_MF_MASK) != 0) && (Info->Length % 8 != 0)) {
goto RESTART;
}
Packet = Ip4Reassemble (&IpSb->Assemble, Packet);
//
// Packet assembly isn't complete, start receive more packet.
//
if (Packet == NULL) {
goto RESTART;
}
}
//
// Packet may have been changed. Head, HeadLen, TotalLen, and
// info must be reloaded bofore use. The ownership of the packet
// is transfered to the packet process logic.
//
Head = Packet->Ip;
IP4_GET_CLIP_INFO (Packet)->Status = EFI_SUCCESS;
switch (Head->Protocol) {
case IP4_PROTO_ICMP:
Ip4IcmpHandle (IpSb, Head, Packet);
break;
case IP4_PROTO_IGMP:
Ip4IgmpHandle (IpSb, Head, Packet);
break;
default:
Ip4Demultiplex (IpSb, Head, Packet);
}
Packet = NULL;
//
// Dispatch the DPCs queued by the NotifyFunction of the rx token's events
// which are signaled with received data.
//
NetLibDispatchDpc ();
RESTART:
Ip4ReceiveFrame (IpSb->DefaultInterface, NULL, Ip4AccpetFrame, IpSb);
DROP:
if (Packet != NULL) {
NetbufFree (Packet);
}
return ;
}
/**
Check whether this IP child accepts the packet.
@param[in] IpInstance The IP child to check
@param[in] Head The IP header of the packet
@param[in] Packet The data of the packet
@retval TRUE If the child wants to receive the packet.
@retval FALSE Otherwise.
**/
BOOLEAN
Ip4InstanceFrameAcceptable (
IN IP4_PROTOCOL *IpInstance,
IN IP4_HEAD *Head,
IN NET_BUF *Packet
)
{
IP4_ICMP_ERROR_HEAD Icmp;
EFI_IP4_CONFIG_DATA *Config;
IP4_CLIP_INFO *Info;
UINT16 Proto;
UINT32 Index;
Config = &IpInstance->ConfigData;
//
// Dirty trick for the Tiano UEFI network stack implmentation. If
// ReceiveTimeout == -1, the receive of the packet for this instance
// is disabled. The UEFI spec don't have such capability. We add
// this to improve the performance because IP will make a copy of
// the received packet for each accepting instance. Some IP instances
// used by UDP/TCP only send packets, they don't wants to receive.
//
if (Config->ReceiveTimeout == (UINT32)(-1)) {
return FALSE;
}
if (Config->AcceptPromiscuous) {
return TRUE;
}
//
// Use protocol from the IP header embedded in the ICMP error
// message to filter, instead of ICMP itself. ICMP handle will
// can Ip4Demultiplex to deliver ICMP errors.
//
Proto = Head->Protocol;
if (Proto == IP4_PROTO_ICMP) {
NetbufCopy (Packet, 0, sizeof (Icmp.Head), (UINT8 *) &Icmp.Head);
if (mIcmpClass[Icmp.Head.Type].IcmpClass == ICMP_ERROR_MESSAGE) {
if (!Config->AcceptIcmpErrors) {
return FALSE;
}
NetbufCopy (Packet, 0, sizeof (Icmp), (UINT8 *) &Icmp);
Proto = Icmp.IpHead.Protocol;
}
}
//
// Match the protocol
//
if (!Config->AcceptAnyProtocol && (Proto != Config->DefaultProtocol)) {
return FALSE;
}
//
// Check for broadcast, the caller has computed the packet's
// cast type for this child's interface.
//
Info = IP4_GET_CLIP_INFO (Packet);
if (IP4_IS_BROADCAST (Info->CastType)) {
return Config->AcceptBroadcast;
}
//
// If it is a multicast packet, check whether we are in the group.
//
if (Info->CastType == IP4_MULTICAST) {
//
// Receive the multicast if the instance wants to receive all packets.
//
if (!IpInstance->ConfigData.UseDefaultAddress && (IpInstance->Interface->Ip == 0)) {
return TRUE;
}
for (Index = 0; Index < IpInstance->GroupCount; Index++) {
if (IpInstance->Groups[Index] == HTONL (Head->Dst)) {
break;
}
}
return (BOOLEAN)(Index < IpInstance->GroupCount);
}
return TRUE;
}
/**
Enqueue a shared copy of the packet to the IP4 child if the
packet is acceptable to it. Here the data of the packet is
shared, but the net buffer isn't.
@param[in] IpInstance The IP4 child to enqueue the packet to
@param[in] Head The IP header of the received packet
@param[in] Packet The data of the received packet
@retval EFI_NOT_STARTED The IP child hasn't been configured.
@retval EFI_INVALID_PARAMETER The child doesn't want to receive the packet
@retval EFI_OUT_OF_RESOURCES Failed to allocate some resource
@retval EFI_SUCCESS A shared copy the packet is enqueued to the child.
**/
EFI_STATUS
Ip4InstanceEnquePacket (
IN IP4_PROTOCOL *IpInstance,
IN IP4_HEAD *Head,
IN NET_BUF *Packet
)
{
IP4_CLIP_INFO *Info;
NET_BUF *Clone;
//
// Check whether the packet is acceptable to this instance.
//
if (IpInstance->State != IP4_STATE_CONFIGED) {
return EFI_NOT_STARTED;
}
if (!Ip4InstanceFrameAcceptable (IpInstance, Head, Packet)) {
return EFI_INVALID_PARAMETER;
}
//
// Enque a shared copy of the packet.
//
Clone = NetbufClone (Packet);
if (Clone == NULL) {
return EFI_OUT_OF_RESOURCES;
}
//
// Set the receive time out for the assembled packet. If it expires,
// packet will be removed from the queue.
//
Info = IP4_GET_CLIP_INFO (Clone);
Info->Life = IP4_US_TO_SEC (IpInstance->ConfigData.ReceiveTimeout);
InsertTailList (&IpInstance->Received, &Clone->List);
return EFI_SUCCESS;
}
/**
The signal handle of IP4's recycle event. It is called back
when the upper layer release the packet.
@param Event The IP4's recycle event.
@param Context The context of the handle, which is a
IP4_RXDATA_WRAP
**/
VOID
EFIAPI
Ip4OnRecyclePacket (
IN EFI_EVENT Event,
IN VOID *Context
)
{
IP4_RXDATA_WRAP *Wrap;
Wrap = (IP4_RXDATA_WRAP *) Context;
EfiAcquireLockOrFail (&Wrap->IpInstance->RecycleLock);
RemoveEntryList (&Wrap->Link);
EfiReleaseLock (&Wrap->IpInstance->RecycleLock);
ASSERT (!NET_BUF_SHARED (Wrap->Packet));
NetbufFree (Wrap->Packet);
gBS->CloseEvent (Wrap->RxData.RecycleSignal);
gBS->FreePool (Wrap);
}
/**
Wrap the received packet to a IP4_RXDATA_WRAP, which will be
delivered to the upper layer. Each IP4 child that accepts the
packet will get a not-shared copy of the packet which is wrapped
in the IP4_RXDATA_WRAP. The IP4_RXDATA_WRAP->RxData is passed
to the upper layer. Upper layer will signal the recycle event in
it when it is done with the packet.
@param[in] IpInstance The IP4 child to receive the packet
@param[in] Packet The packet to deliver up.
@retval Wrap if warp the packet succeed.
@retval NULL failed to wrap the packet .
**/
IP4_RXDATA_WRAP *
Ip4WrapRxData (
IN IP4_PROTOCOL *IpInstance,
IN NET_BUF *Packet
)
{
IP4_RXDATA_WRAP *Wrap;
EFI_IP4_RECEIVE_DATA *RxData;
EFI_STATUS Status;
Wrap = AllocatePool (IP4_RXDATA_WRAP_SIZE (Packet->BlockOpNum));
if (Wrap == NULL) {
return NULL;
}
InitializeListHead (&Wrap->Link);
Wrap->IpInstance = IpInstance;
Wrap->Packet = Packet;
RxData = &Wrap->RxData;
ZeroMem (&RxData->TimeStamp, sizeof (EFI_TIME));
Status = gBS->CreateEvent (
EVT_NOTIFY_SIGNAL,
TPL_NOTIFY,
Ip4OnRecyclePacket,
Wrap,
&RxData->RecycleSignal
);
if (EFI_ERROR (Status)) {
gBS->FreePool (Wrap);
return NULL;
}
ASSERT (Packet->Ip != NULL);
//
// The application expects a network byte order header.
//
RxData->HeaderLength = (Packet->Ip->HeadLen << 2);
RxData->Header = (EFI_IP4_HEADER *) Ip4NtohHead (Packet->Ip);
RxData->OptionsLength = RxData->HeaderLength - IP4_MIN_HEADLEN;
RxData->Options = NULL;
if (RxData->OptionsLength != 0) {
RxData->Options = (VOID *) (RxData->Header + 1);
}
RxData->DataLength = Packet->TotalSize;
//
// Build the fragment table to be delivered up.
//
RxData->FragmentCount = Packet->BlockOpNum;
NetbufBuildExt (Packet, (NET_FRAGMENT *) RxData->FragmentTable, &RxData->FragmentCount);
return Wrap;
}
/**
Deliver the received packets to upper layer if there are both received
requests and enqueued packets. If the enqueued packet is shared, it will
duplicate it to a non-shared packet, release the shared packet, then
deliver the non-shared packet up.
@param[in] IpInstance The IP child to deliver the packet up.
@retval EFI_OUT_OF_RESOURCES Failed to allocate resources to deliver the
packets.
@retval EFI_SUCCESS All the enqueued packets that can be delivered
are delivered up.
**/
EFI_STATUS
Ip4InstanceDeliverPacket (
IN IP4_PROTOCOL *IpInstance
)
{
EFI_IP4_COMPLETION_TOKEN *Token;
IP4_RXDATA_WRAP *Wrap;
NET_BUF *Packet;
NET_BUF *Dup;
UINT8 *Head;
//
// Deliver a packet if there are both a packet and a receive token.
//
while (!IsListEmpty (&IpInstance->Received) &&
!NetMapIsEmpty (&IpInstance->RxTokens)) {
Packet = NET_LIST_HEAD (&IpInstance->Received, NET_BUF, List);
if (!NET_BUF_SHARED (Packet)) {
//
// If this is the only instance that wants the packet, wrap it up.
//
Wrap = Ip4WrapRxData (IpInstance, Packet);
if (Wrap == NULL) {
return EFI_OUT_OF_RESOURCES;
}
RemoveEntryList (&Packet->List);
} else {
//
// Create a duplicated packet if this packet is shared
//
Dup = NetbufDuplicate (Packet, NULL, IP4_MAX_HEADLEN);
if (Dup == NULL) {
return EFI_OUT_OF_RESOURCES;
}
//
// Copy the IP head over. The packet to deliver up is
// headless. Trim the head off after copy. The IP head
// may be not continuous before the data.
//
Head = NetbufAllocSpace (Dup, IP4_MAX_HEADLEN, NET_BUF_HEAD);
Dup->Ip = (IP4_HEAD *) Head;
CopyMem (Head, Packet->Ip, Packet->Ip->HeadLen << 2);
NetbufTrim (Dup, IP4_MAX_HEADLEN, TRUE);
Wrap = Ip4WrapRxData (IpInstance, Dup);
if (Wrap == NULL) {
NetbufFree (Dup);
return EFI_OUT_OF_RESOURCES;
}
RemoveEntryList (&Packet->List);
NetbufFree (Packet);
Packet = Dup;
}
//
// Insert it into the delivered packet, then get a user's
// receive token, pass the wrapped packet up.
//
EfiAcquireLockOrFail (&IpInstance->RecycleLock);
InsertHeadList (&IpInstance->Delivered, &Wrap->Link);
EfiReleaseLock (&IpInstance->RecycleLock);
Token = NetMapRemoveHead (&IpInstance->RxTokens, NULL);
Token->Status = IP4_GET_CLIP_INFO (Packet)->Status;
Token->Packet.RxData = &Wrap->RxData;
gBS->SignalEvent (Token->Event);
}
return EFI_SUCCESS;
}
/**
Enqueue a received packet to all the IP children that share
the same interface.
@param[in] IpSb The IP4 service instance that receive the packet
@param[in] Head The header of the received packet
@param[in] Packet The data of the received packet
@param[in] IpIf The interface to enqueue the packet to
@return The number of the IP4 children that accepts the packet
**/
INTN
Ip4InterfaceEnquePacket (
IN IP4_SERVICE *IpSb,
IN IP4_HEAD *Head,
IN NET_BUF *Packet,
IN IP4_INTERFACE *IpIf
)
{
IP4_PROTOCOL *IpInstance;
IP4_CLIP_INFO *Info;
LIST_ENTRY *Entry;
INTN Enqueued;
INTN LocalType;
INTN SavedType;
//
// First, check that the packet is acceptable to this interface
// and find the local cast type for the interface. A packet sent
// to say 192.168.1.1 should NOT be delliever to 10.0.0.1 unless
// promiscuous receiving.
//
LocalType = 0;
Info = IP4_GET_CLIP_INFO (Packet);
if ((Info->CastType == IP4_MULTICAST) || (Info->CastType == IP4_LOCAL_BROADCAST)) {
//
// If the CastType is multicast, don't need to filter against
// the group address here, Ip4InstanceFrameAcceptable will do
// that later.
//
LocalType = Info->CastType;
} else {
//
// Check the destination againist local IP. If the station
// address is 0.0.0.0, it means receiving all the IP destined
// to local non-zero IP. Otherwise, it is necessary to compare
// the destination to the interface's IP address.
//
if (IpIf->Ip == IP4_ALLZERO_ADDRESS) {
LocalType = IP4_LOCAL_HOST;
} else {
LocalType = Ip4GetNetCast (Head->Dst, IpIf);
if ((LocalType == 0) && IpIf->PromiscRecv) {
LocalType = IP4_PROMISCUOUS;
}
}
}
if (LocalType == 0) {
return 0;
}
//
// Iterate through the ip instances on the interface, enqueue
// the packet if filter passed. Save the original cast type,
// and pass the local cast type to the IP children on the
// interface. The global cast type will be restored later.
//
SavedType = Info->CastType;
Info->CastType = LocalType;
Enqueued = 0;
NET_LIST_FOR_EACH (Entry, &IpIf->IpInstances) {
IpInstance = NET_LIST_USER_STRUCT (Entry, IP4_PROTOCOL, AddrLink);
NET_CHECK_SIGNATURE (IpInstance, IP4_PROTOCOL_SIGNATURE);
if (Ip4InstanceEnquePacket (IpInstance, Head, Packet) == EFI_SUCCESS) {
Enqueued++;
}
}
Info->CastType = SavedType;
return Enqueued;
}
/**
Deliver the packet for each IP4 child on the interface.
@param[in] IpSb The IP4 service instance that received the packet
@param[in] IpIf The IP4 interface to deliver the packet.
@retval EFI_SUCCESS It always returns EFI_SUCCESS now
**/
EFI_STATUS
Ip4InterfaceDeliverPacket (
IN IP4_SERVICE *IpSb,
IN IP4_INTERFACE *IpIf
)
{
IP4_PROTOCOL *Ip4Instance;
LIST_ENTRY *Entry;
NET_LIST_FOR_EACH (Entry, &IpIf->IpInstances) {
Ip4Instance = NET_LIST_USER_STRUCT (Entry, IP4_PROTOCOL, AddrLink);
Ip4InstanceDeliverPacket (Ip4Instance);
}
return EFI_SUCCESS;
}
/**
Demultiple the packet. the packet delivery is processed in two
passes. The first pass will enque a shared copy of the packet
to each IP4 child that accepts the packet. The second pass will
deliver a non-shared copy of the packet to each IP4 child that
has pending receive requests. Data is copied if more than one
child wants to consume the packet because each IP child needs
its own copy of the packet to make changes.
@param[in] IpSb The IP4 service instance that received the packet
@param[in] Head The header of the received packet
@param[in] Packet The data of the received packet
@retval EFI_NOT_FOUND No IP child accepts the packet
@retval EFI_SUCCESS The packet is enqueued or delivered to some IP
children.
**/
EFI_STATUS
Ip4Demultiplex (
IN IP4_SERVICE *IpSb,
IN IP4_HEAD *Head,
IN NET_BUF *Packet
)
{
LIST_ENTRY *Entry;
IP4_INTERFACE *IpIf;
INTN Enqueued;
//
// Two pass delivery: first, enque a shared copy of the packet
// to each instance that accept the packet.
//
Enqueued = 0;
NET_LIST_FOR_EACH (Entry, &IpSb->Interfaces) {
IpIf = NET_LIST_USER_STRUCT (Entry, IP4_INTERFACE, Link);
if (IpIf->Configured) {
Enqueued += Ip4InterfaceEnquePacket (IpSb, Head, Packet, IpIf);
}
}
//
// Second: deliver a duplicate of the packet to each instance.
// Release the local reference first, so that the last instance
// getting the packet will not copy the data.
//
NetbufFree (Packet);
if (Enqueued == 0) {
return EFI_NOT_FOUND;
}
NET_LIST_FOR_EACH (Entry, &IpSb->Interfaces) {
IpIf = NET_LIST_USER_STRUCT (Entry, IP4_INTERFACE, Link);
if (IpIf->Configured) {
Ip4InterfaceDeliverPacket (IpSb, IpIf);
}
}
return EFI_SUCCESS;
}
/**
Timeout the fragment and enqueued packets.
@param[in] IpSb The IP4 service instance to timeout
**/
VOID
Ip4PacketTimerTicking (
IN IP4_SERVICE *IpSb
)
{
LIST_ENTRY *InstanceEntry;
LIST_ENTRY *Entry;
LIST_ENTRY *Next;
IP4_PROTOCOL *IpInstance;
IP4_ASSEMBLE_ENTRY *Assemble;
NET_BUF *Packet;
IP4_CLIP_INFO *Info;
UINT32 Index;
//
// First, time out the fragments. The packet's life is counting down
// once the first-arrived fragment was received.
//
for (Index = 0; Index < IP4_ASSEMLE_HASH_SIZE; Index++) {
NET_LIST_FOR_EACH_SAFE (Entry, Next, &IpSb->Assemble.Bucket[Index]) {
Assemble = NET_LIST_USER_STRUCT (Entry, IP4_ASSEMBLE_ENTRY, Link);
if ((Assemble->Life > 0) && (--Assemble->Life == 0)) {
RemoveEntryList (Entry);
Ip4FreeAssembleEntry (Assemble);
}
}
}
NET_LIST_FOR_EACH (InstanceEntry, &IpSb->Children) {
IpInstance = NET_LIST_USER_STRUCT (InstanceEntry, IP4_PROTOCOL, Link);
//
// Second, time out the assembled packets enqueued on each IP child.
//
NET_LIST_FOR_EACH_SAFE (Entry, Next, &IpInstance->Received) {
Packet = NET_LIST_USER_STRUCT (Entry, NET_BUF, List);
Info = IP4_GET_CLIP_INFO (Packet);
if ((Info->Life > 0) && (--Info->Life == 0)) {
RemoveEntryList (Entry);
NetbufFree (Packet);
}
}
//
// Third: time out the transmitted packets.
//
NetMapIterate (&IpInstance->TxTokens, Ip4SentPacketTicking, NULL);
}
}
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