4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync IP4 input process.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsyncCopyright (c) 2005 - 2011, Intel Corporation. All rights reserved.<BR>
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsyncThis program and the accompanying materials
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsyncare licensed and made available under the terms and conditions of the BSD License
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsyncwhich accompanies this distribution. The full text of the license may be found at
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsyncTHE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsyncWITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Create an empty assemble entry for the packet identified by
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync (Dst, Src, Id, Protocol). The default life for the packet is
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync 120 seconds.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Dst The destination address
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Src The source address
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Id The ID field in IP header
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Protocol The protocol field in IP header
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @return NULL if failed to allocate memory for the entry, otherwise
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync the point to just created reassemble entry.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Assemble = AllocatePool (sizeof (IP4_ASSEMBLE_ENTRY));
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Release all the fragments of a packet, then free the assemble entry.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Assemble The assemble entry to free
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync NET_LIST_FOR_EACH_SAFE (Entry, Next, &Assemble->Fragments) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Fragment = NET_LIST_USER_STRUCT (Entry, NET_BUF, List);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Initialize an already allocated assemble table. This is generally
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync the assemble table embedded in the IP4 service instance.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in, out] Table The assemble table to initialize.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync for (Index = 0; Index < IP4_ASSEMLE_HASH_SIZE; Index++) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Clean up the assemble table: remove all the fragments
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync and assemble entries.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Table The assemble table to clean up
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync for (Index = 0; Index < IP4_ASSEMLE_HASH_SIZE; Index++) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync NET_LIST_FOR_EACH_SAFE (Entry, Next, &Table->Bucket[Index]) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Assemble = NET_LIST_USER_STRUCT (Entry, IP4_ASSEMBLE_ENTRY, Link);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Trim the packet to fit in [Start, End), and update the per
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync packet information.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param Packet Packet to trim
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param Start The sequence of the first byte to fit in
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param End One beyond the sequence of last byte to fit in.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync ASSERT ((Info->Start < End) && (Start < Info->End));
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Release all the fragments of the packet. This is the callback for
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync the assembled packet's OnFree. It will free the assemble entry,
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync which in turn will free all the fragments of the packet.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Arg The assemble entry to free
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Reassemble the IP fragments. If all the fragments of the packet
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync have been received, it will wrap the packet in a net buffer then
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync return it to caller. If the packet can't be assembled, NULL is
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param Table The assemble table used. New assemble entry will be created
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync if the Packet is from a new chain of fragments.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param Packet The fragment to assemble. It might be freed if the fragment
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync can't be re-assembled.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @return NULL if the packet can't be reassemble. The point to just assembled
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync packet if all the fragments of the packet have arrived.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // First: find the related assemble entry
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Index = IP4_ASSEMBLE_HASH (IpHead->Dst, IpHead->Src, IpHead->Id, IpHead->Protocol);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Assemble = NET_LIST_USER_STRUCT (Cur, IP4_ASSEMBLE_ENTRY, Link);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync if ((Assemble->Dst == IpHead->Dst) && (Assemble->Src == IpHead->Src) &&
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync (Assemble->Id == IpHead->Id) && (Assemble->Protocol == IpHead->Protocol)) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Create a new assemble entry if no assemble entry is related to this packet
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync InsertHeadList (&Table->Bucket[Index], &Assemble->Link);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Assemble shouldn't be NULL here
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Find the point to insert the packet: before the first
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // fragment with THIS.Start < CUR.Start. the previous one
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // has PREV.Start <= THIS.Start < CUR.Start.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Fragment = NET_LIST_USER_STRUCT (Cur, NET_BUF, List);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync if (This->Start < IP4_GET_CLIP_INFO (Fragment)->Start) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Check whether the current fragment overlaps with the previous one.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // It holds that: PREV.Start <= THIS.Start < THIS.End. Only need to
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // check whether THIS.Start < PREV.End for overlap. If two fragments
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // overlaps, trim the overlapped part off THIS fragment.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync if ((Cur != Head) && ((Prev = Cur->BackLink) != Head)) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Fragment = NET_LIST_USER_STRUCT (Prev, NET_BUF, List);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Insert the fragment into the packet. The fragment may be removed
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // from the list by the following checks.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Check the packets after the insert point. It holds that:
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // THIS.Start <= NODE.Start < NODE.End. The equality holds
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // if PREV and NEXT are continuous. THIS fragment may fill
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // several holes. Remove the completely overlapped fragments
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Fragment = NET_LIST_USER_STRUCT (Cur, NET_BUF, List);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Remove fragments completely overlapped by this fragment
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // The conditions are: THIS.Start <= NODE.Start, and THIS.End <
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // NODE.End. Two fragments overlaps if NODE.Start < THIS.End.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // If two fragments start at the same offset, remove THIS fragment
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // because ((THIS.Start == NODE.Start) && (THIS.End < NODE.End)).
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Update the assemble info: increase the current length. If it is
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // the frist fragment, update the packet's IP head and per packet
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // info. If it is the last fragment, update the total length.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Once the first fragment is enqueued, it can't be removed
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // from the fragment list. So, Assemble->Head always point
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // to valid memory area.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Don't update the length more than once.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync if (IP4_LAST_FRAGMENT (IpHead->Fragment) && (Assemble->TotalLen == 0)) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Deliver the whole packet if all the fragments received.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // All fragments received if:
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // 1. received the last one, so, the total length is know
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // 2. received all the data. If the last fragment on the
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // queue ends at the total length, all data is received.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync if ((Assemble->TotalLen != 0) && (Assemble->CurLen >= Assemble->TotalLen)) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // If the packet is properly formated, the last fragment's End
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // equals to the packet's total length. Otherwise, the packet
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // is a fake, drop it now.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Fragment = NET_LIST_USER_STRUCT (Head->BackLink, NET_BUF, List);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync if (IP4_GET_CLIP_INFO (Fragment)->End != Assemble->TotalLen) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Wrap the packet in a net buffer then deliver it up
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync The callback function for the net buffer which wraps the packet processed by
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync IPsec. It releases the wrap packet and also signals IPsec to free the resources.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Arg The wrap context
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync The work function to locate IPsec protocol to process the inbound or
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync outbound IP packets. The process routine handls the packet with following
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync actions: bypass the packet, discard the packet, or protect the packet.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] IpSb The IP4 service instance.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in, out] Head The The caller supplied IP4 header.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in, out] Netbuf The IP4 packet to be processed by IPsec.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in, out] Options The caller supplied options.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in, out] OptionsLen The length of the option.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Direction The directionality in an SPD entry,
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync EfiIPsecInBound or EfiIPsecOutBound.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Context The token's wrap.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @retval EFI_SUCCESS The IPsec protocol is not available or disabled.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @retval EFI_SUCCESS The packet was bypassed and all buffers remain the same.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @retval EFI_SUCCESS The packet was protected.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @retval EFI_ACCESS_DENIED The packet was discarded.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @retval EFI_OUT_OF_RESOURCES There is no suffcient resource to complete the operation.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @retval EFI_BUFFER_TOO_SMALL The number of non-empty block is bigger than the
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync number of input data blocks when build a fragment table.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync gBS->LocateProtocol (&gEfiIpSec2ProtocolGuid, NULL, (VOID **) &mIpSec);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Check whether the IPsec enable variable is set.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // If IPsec is disabled, restore the original MTU
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // If IPsec is enabled, use the MTU which reduce the IPsec header length.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync IpSb->MaxPacketSize = IpSb->OldMaxPacketSize - IP4_MAX_IPSEC_HEADLEN;
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Rebuild fragment table from netbuf to ease IPsec process.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync FragmentTable = AllocateZeroPool (FragmentCount * sizeof (NET_FRAGMENT));
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Status = NetbufBuildExt (Packet, FragmentTable, &FragmentCount);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Record the original FragmentTable and count.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Convert host byte order to network byte order
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Convert back to host byte order
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync if (OriginalFragmentTable == FragmentTable && OriginalFragmentCount == FragmentCount) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // For ByPass Packet
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Free the FragmentTable which allocated before calling the IPsec.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync if (Direction == EfiIPsecOutBound && TxWrap != NULL) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Recover the TxWrap->Packet, if meet a error, and the caller will free
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // the TxWrap.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Free orginal Netbuf.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync IpSecWrap = AllocateZeroPool (sizeof (IP4_IPSEC_WRAP));
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync if (Direction == EfiIPsecInBound && 0 != CompareMem (*Head, &ZeroHead, sizeof (IP4_HEAD))) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Ip4PrependHead (Packet, *Head, *Options, *OptionsLen);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync NetbufTrim (Packet, ((*Head)->HeadLen << 2), TRUE);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Pre-process the IPv4 packet. First validates the IPv4 packet, and
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync then reassembles packet if it is necessary.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] IpSb Pointer to IP4_SERVICE.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in, out] Packet Pointer to the Packet to be processed.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Head Pointer to the IP4_HEAD.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Option Pointer to a buffer which contains the IPv4 option.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] OptionLen The length of Option in bytes.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Flag The link layer flag for the packet received, such
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync as multicast.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @retval EFI_SEUCCESS The recieved packet is in well form.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @retval EFI_INVAILD_PARAMETER The recieved packet is malformed.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Check that the IP4 header is correctly formatted
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Mnp may deliver frame trailer sequence up, trim it off.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync NetbufTrim (*Packet, (*Packet)->TotalSize - TotalLen, FALSE);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync if ((Head->Ver != 4) || (HeadLen < IP4_MIN_HEADLEN) ||
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync (TotalLen < HeadLen) || (TotalLen != (*Packet)->TotalSize)) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Some OS may send IP packets without checksum.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Checksum = (UINT16) (~NetblockChecksum ((UINT8 *) Head, HeadLen));
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Convert the IP header to host byte order, then get the per packet info.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Info->CastType = Ip4GetHostCast (IpSb, Head->Dst, Head->Src);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Info->Start = (Head->Fragment & IP4_HEAD_OFFSET_MASK) << 3;
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // The packet is destinated to us if the CastType is non-zero.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync if ((Info->CastType == 0) || (Info->End > IP4_MAX_PACKET_SIZE)) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Validate the options. Don't call the Ip4OptionIsValid if
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // there is no option to save some CPU process.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync if ((OptionLen > 0) && !Ip4OptionIsValid (Option, OptionLen, TRUE)) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Trim the head off, after this point, the packet is headless.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // and Packet->TotalLen == Info->Length.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Reassemble the packet if this is a fragment. The packet is a
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // fragment if its head has MF (more fragment) set, or it starts
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // at non-zero byte.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync if (((Head->Fragment & IP4_HEAD_MF_MASK) != 0) || (Info->Start != 0)) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Drop the fragment if DF is set but it is fragmented. Gateway
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // need to send a type 4 destination unreache ICMP message here.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // The length of all but the last fragments is in the unit of 8 bytes.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync if (((Head->Fragment & IP4_HEAD_MF_MASK) != 0) && (Info->Length % 8 != 0)) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync *Packet = Ip4Reassemble (&IpSb->Assemble, *Packet);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Packet assembly isn't complete, start receive more packet.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync The IP4 input routine. It is called by the IP4_INTERFACE when a
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync IP4 fragment is received from MNP.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Ip4Instance The IP4 child that request the receive, most like
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync it is NULL.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Packet The IP4 packet received.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] IoStatus The return status of receive request.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Flag The link layer flag for the packet received, such
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync as multicast.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Context The IP4 service instance that own the MNP.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync if (EFI_ERROR (IoStatus) || (IpSb->State == IP4_SERVICE_DESTORY)) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Head = (IP4_HEAD *) NetbufGetByte (Packet, 0, NULL);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync OptionLen = (Head->HeadLen << 2) - IP4_MIN_HEADLEN;
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Validate packet format and reassemble packet if it is necessary.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // After trim off, the packet is a esp/ah/udp/tcp/icmp6 net buffer,
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // and no need consider any other ahead ext headers.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // If the packet is protected by tunnel mode, parse the inner Ip Packet.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync if (0 == CompareMem (Head, &ZeroHead, sizeof (IP4_HEAD))) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Packet may have been changed. Head, HeadLen, TotalLen, and
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // info must be reloaded bofore use. The ownership of the packet
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // is transfered to the packet process logic.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Head = (IP4_HEAD *) NetbufGetByte (Packet, 0, NULL);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Dispatch the DPCs queued by the NotifyFunction of the rx token's events
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // which are signaled with received data.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Ip4ReceiveFrame (IpSb->DefaultInterface, NULL, Ip4AccpetFrame, IpSb);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Check whether this IP child accepts the packet.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] IpInstance The IP child to check
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Head The IP header of the packet
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Packet The data of the packet
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @retval TRUE If the child wants to receive the packet.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @retval FALSE Otherwise.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Dirty trick for the Tiano UEFI network stack implmentation. If
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // ReceiveTimeout == -1, the receive of the packet for this instance
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // is disabled. The UEFI spec don't have such capability. We add
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // this to improve the performance because IP will make a copy of
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // the received packet for each accepting instance. Some IP instances
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // used by UDP/TCP only send packets, they don't wants to receive.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Use protocol from the IP header embedded in the ICMP error
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // message to filter, instead of ICMP itself. ICMP handle will
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // call Ip4Demultiplex to deliver ICMP errors.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync if ((Proto == EFI_IP_PROTO_ICMP) && (!Config->AcceptAnyProtocol) && (Proto != Config->DefaultProtocol)) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync NetbufCopy (Packet, 0, sizeof (Icmp.Head), (UINT8 *) &Icmp.Head);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync if (mIcmpClass[Icmp.Head.Type].IcmpClass == ICMP_ERROR_MESSAGE) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync NetbufCopy (Packet, 0, sizeof (Icmp), (UINT8 *) &Icmp);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Match the protocol
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync if (!Config->AcceptAnyProtocol && (Proto != Config->DefaultProtocol)) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Check for broadcast, the caller has computed the packet's
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // cast type for this child's interface.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // If it is a multicast packet, check whether we are in the group.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Receive the multicast if the instance wants to receive all packets.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync if (!IpInstance->ConfigData.UseDefaultAddress && (IpInstance->Interface->Ip == 0)) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync for (Index = 0; Index < IpInstance->GroupCount; Index++) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync if (IpInstance->Groups[Index] == HTONL (Head->Dst)) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Enqueue a shared copy of the packet to the IP4 child if the
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync packet is acceptable to it. Here the data of the packet is
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync shared, but the net buffer isn't.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] IpInstance The IP4 child to enqueue the packet to
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Head The IP header of the received packet
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Packet The data of the received packet
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @retval EFI_NOT_STARTED The IP child hasn't been configured.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @retval EFI_INVALID_PARAMETER The child doesn't want to receive the packet
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @retval EFI_OUT_OF_RESOURCES Failed to allocate some resource
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @retval EFI_SUCCESS A shared copy the packet is enqueued to the child.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Check whether the packet is acceptable to this instance.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync if (!Ip4InstanceFrameAcceptable (IpInstance, Head, Packet)) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Enque a shared copy of the packet.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Set the receive time out for the assembled packet. If it expires,
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // packet will be removed from the queue.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Info->Life = IP4_US_TO_SEC (IpInstance->ConfigData.ReceiveTimeout);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync InsertTailList (&IpInstance->Received, &Clone->List);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync The signal handle of IP4's recycle event. It is called back
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync when the upper layer release the packet.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param Event The IP4's recycle event.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param Context The context of the handle, which is a
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync IP4_RXDATA_WRAP
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync EfiAcquireLockOrFail (&Wrap->IpInstance->RecycleLock);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Wrap the received packet to a IP4_RXDATA_WRAP, which will be
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync delivered to the upper layer. Each IP4 child that accepts the
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync packet will get a not-shared copy of the packet which is wrapped
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync in the IP4_RXDATA_WRAP. The IP4_RXDATA_WRAP->RxData is passed
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync to the upper layer. Upper layer will signal the recycle event in
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync it when it is done with the packet.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] IpInstance The IP4 child to receive the packet
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Packet The packet to deliver up.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @retval Wrap if warp the packet succeed.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @retval NULL failed to wrap the packet .
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Wrap = AllocatePool (IP4_RXDATA_WRAP_SIZE (Packet->BlockOpNum));
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // The application expects a network byte order header.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync RxData->HeaderLength = (Packet->Ip.Ip4->HeadLen << 2);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync RxData->Header = (EFI_IP4_HEADER *) Ip4NtohHead (Packet->Ip.Ip4);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync RxData->OptionsLength = RxData->HeaderLength - IP4_MIN_HEADLEN;
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Build the fragment table to be delivered up.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync NetbufBuildExt (Packet, (NET_FRAGMENT *) RxData->FragmentTable, &RxData->FragmentCount);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Deliver the received packets to upper layer if there are both received
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync requests and enqueued packets. If the enqueued packet is shared, it will
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync duplicate it to a non-shared packet, release the shared packet, then
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync deliver the non-shared packet up.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] IpInstance The IP child to deliver the packet up.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @retval EFI_OUT_OF_RESOURCES Failed to allocate resources to deliver the
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @retval EFI_SUCCESS All the enqueued packets that can be delivered
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync are delivered up.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Deliver a packet if there are both a packet and a receive token.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Packet = NET_LIST_HEAD (&IpInstance->Received, NET_BUF, List);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // If this is the only instance that wants the packet, wrap it up.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Create a duplicated packet if this packet is shared
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Dup = NetbufDuplicate (Packet, NULL, IP4_MAX_HEADLEN);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Copy the IP head over. The packet to deliver up is
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // headless. Trim the head off after copy. The IP head
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // may be not continuous before the data.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Head = NetbufAllocSpace (Dup, IP4_MAX_HEADLEN, NET_BUF_HEAD);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync CopyMem (Head, Packet->Ip.Ip4, Packet->Ip.Ip4->HeadLen << 2);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Insert it into the delivered packet, then get a user's
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // receive token, pass the wrapped packet up.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync InsertHeadList (&IpInstance->Delivered, &Wrap->Link);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Token = NetMapRemoveHead (&IpInstance->RxTokens, NULL);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Token->Status = IP4_GET_CLIP_INFO (Packet)->Status;
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Enqueue a received packet to all the IP children that share
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync the same interface.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] IpSb The IP4 service instance that receive the packet
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Head The header of the received packet
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Packet The data of the received packet
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] IpIf The interface to enqueue the packet to
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @return The number of the IP4 children that accepts the packet
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // First, check that the packet is acceptable to this interface
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // and find the local cast type for the interface. A packet sent
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // to say 192.168.1.1 should NOT be delliever to 10.0.0.1 unless
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // promiscuous receiving.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync if ((Info->CastType == IP4_MULTICAST) || (Info->CastType == IP4_LOCAL_BROADCAST)) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // If the CastType is multicast, don't need to filter against
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // the group address here, Ip4InstanceFrameAcceptable will do
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // that later.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Check the destination againist local IP. If the station
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // address is 0.0.0.0, it means receiving all the IP destined
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // to local non-zero IP. Otherwise, it is necessary to compare
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // the destination to the interface's IP address.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Iterate through the ip instances on the interface, enqueue
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // the packet if filter passed. Save the original cast type,
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // and pass the local cast type to the IP children on the
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // interface. The global cast type will be restored later.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync IpInstance = NET_LIST_USER_STRUCT (Entry, IP4_PROTOCOL, AddrLink);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync NET_CHECK_SIGNATURE (IpInstance, IP4_PROTOCOL_SIGNATURE);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync if (Ip4InstanceEnquePacket (IpInstance, Head, Packet) == EFI_SUCCESS) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Deliver the packet for each IP4 child on the interface.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] IpSb The IP4 service instance that received the packet
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] IpIf The IP4 interface to deliver the packet.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @retval EFI_SUCCESS It always returns EFI_SUCCESS now
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Ip4Instance = NET_LIST_USER_STRUCT (Entry, IP4_PROTOCOL, AddrLink);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Demultiple the packet. the packet delivery is processed in two
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync passes. The first pass will enque a shared copy of the packet
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync to each IP4 child that accepts the packet. The second pass will
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync deliver a non-shared copy of the packet to each IP4 child that
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync has pending receive requests. Data is copied if more than one
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync child wants to consume the packet because each IP child needs
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync its own copy of the packet to make changes.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] IpSb The IP4 service instance that received the packet
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Head The header of the received packet
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Packet The data of the received packet
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @retval EFI_NOT_FOUND No IP child accepts the packet
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @retval EFI_SUCCESS The packet is enqueued or delivered to some IP
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Two pass delivery: first, enque a shared copy of the packet
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // to each instance that accept the packet.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync IpIf = NET_LIST_USER_STRUCT (Entry, IP4_INTERFACE, Link);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Enqueued += Ip4InterfaceEnquePacket (IpSb, Head, Packet, IpIf);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Second: deliver a duplicate of the packet to each instance.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Release the local reference first, so that the last instance
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // getting the packet will not copy the data.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync IpIf = NET_LIST_USER_STRUCT (Entry, IP4_INTERFACE, Link);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Timeout the fragment and enqueued packets.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] IpSb The IP4 service instance to timeout
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // First, time out the fragments. The packet's life is counting down
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // once the first-arrived fragment was received.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync for (Index = 0; Index < IP4_ASSEMLE_HASH_SIZE; Index++) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync NET_LIST_FOR_EACH_SAFE (Entry, Next, &IpSb->Assemble.Bucket[Index]) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Assemble = NET_LIST_USER_STRUCT (Entry, IP4_ASSEMBLE_ENTRY, Link);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync if ((Assemble->Life > 0) && (--Assemble->Life == 0)) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync NET_LIST_FOR_EACH (InstanceEntry, &IpSb->Children) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync IpInstance = NET_LIST_USER_STRUCT (InstanceEntry, IP4_PROTOCOL, Link);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Second, time out the assembled packets enqueued on each IP child.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync NET_LIST_FOR_EACH_SAFE (Entry, Next, &IpInstance->Received) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Packet = NET_LIST_USER_STRUCT (Entry, NET_BUF, List);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Third: time out the transmitted packets.