Ip4Common.c

Go to the documentation of this file.

 
#include "Ip4Impl.h"
 
INTN
Ip4GetNetCast (
  IN  IP4_ADDR       IpAddr,
  IN  IP4_INTERFACE  *IpIf
  )
{
  if (IpAddr == IpIf->Ip) {
    return IP4_LOCAL_HOST;
  } else if (IpAddr == IpIf->SubnetBrdcast) {
    return IP4_SUBNET_BROADCAST;
  } else if (IpAddr == IpIf->NetBrdcast) {
    return IP4_NET_BROADCAST;
  }
 
  return 0;
}
 
INTN
Ip4GetHostCast (
  IN  IP4_SERVICE  *IpSb,
  IN  IP4_ADDR     Dst,
  IN  IP4_ADDR     Src
  )
{
  LIST_ENTRY     *Entry;
  IP4_INTERFACE  *IpIf;
  INTN           Type;
  INTN           Class;
 
  Type = 0;
 
  if (IpSb->MnpConfigData.EnablePromiscuousReceive) {
    Type = IP4_PROMISCUOUS;
  }
 
  //
  // Go through the interface list of the IP service, most likely.
  //
  NET_LIST_FOR_EACH (Entry, &IpSb->Interfaces) {
    IpIf = NET_LIST_USER_STRUCT (Entry, IP4_INTERFACE, Link);
 
    //
    // Skip the unconfigured interface and invalid source address:
    // source address can't be broadcast.
    //
    if (!IpIf->Configured || IP4_IS_BROADCAST (Ip4GetNetCast (Src, IpIf))) {
      continue;
    }
 
    if ((Class = Ip4GetNetCast (Dst, IpIf)) > Type) {
      return Class;
    }
  }
 
  //
  // If it is local broadcast address. The source address must
  // be a unicast address on one of the direct connected network.
  // If it is a multicast address, accept it only if we are in
  // the group.
  //
  if (Dst == IP4_ALLONE_ADDRESS) {
    IpIf = Ip4FindNet (IpSb, Src);
 
    if ((IpIf != NULL) && !IP4_IS_BROADCAST (Ip4GetNetCast (Src, IpIf))) {
      return IP4_LOCAL_BROADCAST;
    }
  } else if (IP4_IS_MULTICAST (Dst) && (Ip4FindGroup (&IpSb->IgmpCtrl, Dst) != NULL)) {
    return IP4_MULTICAST;
  }
 
  return Type;
}
 
IP4_INTERFACE *
Ip4FindInterface (
  IN IP4_SERVICE  *IpSb,
  IN IP4_ADDR     Ip
  )
{
  LIST_ENTRY     *Entry;
  IP4_INTERFACE  *IpIf;
 
  NET_LIST_FOR_EACH (Entry, &IpSb->Interfaces) {
    IpIf = NET_LIST_USER_STRUCT (Entry, IP4_INTERFACE, Link);
 
    if (IpIf->Configured && (IpIf->Ip == Ip)) {
      return IpIf;
    }
  }
 
  return NULL;
}
 
IP4_INTERFACE *
Ip4FindNet (
  IN IP4_SERVICE  *IpSb,
  IN IP4_ADDR     Ip
  )
{
  LIST_ENTRY     *Entry;
  IP4_INTERFACE  *IpIf;
 
  NET_LIST_FOR_EACH (Entry, &IpSb->Interfaces) {
    IpIf = NET_LIST_USER_STRUCT (Entry, IP4_INTERFACE, Link);
 
    if (IpIf->Configured && IP4_NET_EQUAL (Ip, IpIf->Ip, IpIf->SubnetMask)) {
      return IpIf;
    }
  }
 
  return NULL;
}
 
IP4_INTERFACE *
Ip4FindStationAddress (
  IN IP4_SERVICE  *IpSb,
  IN IP4_ADDR     Ip,
  IN IP4_ADDR     Netmask
  )
{
  LIST_ENTRY     *Entry;
  IP4_INTERFACE  *IpIf;
 
  NET_LIST_FOR_EACH (Entry, &IpSb->Interfaces) {
    IpIf = NET_LIST_USER_STRUCT (Entry, IP4_INTERFACE, Link);
 
    if (IpIf->Configured && (IpIf->Ip == Ip) && (IpIf->SubnetMask == Netmask)) {
      return IpIf;
    }
  }
 
  return NULL;
}
 
EFI_STATUS
Ip4GetMulticastMac (
  IN  EFI_MANAGED_NETWORK_PROTOCOL  *Mnp,
  IN  IP4_ADDR                      Multicast,
  OUT EFI_MAC_ADDRESS               *Mac
  )
{
  EFI_IP_ADDRESS  EfiIp;
 
  EFI_IP4 (EfiIp.v4) = HTONL (Multicast);
  return Mnp->McastIpToMac (Mnp, FALSE, &EfiIp, Mac);
}
 
IP4_HEAD *
Ip4NtohHead (
  IN IP4_HEAD  *Head
  )
{
  Head->TotalLen = NTOHS (Head->TotalLen);
  Head->Id       = NTOHS (Head->Id);
  Head->Fragment = NTOHS (Head->Fragment);
  Head->Src      = NTOHL (Head->Src);
  Head->Dst      = NTOHL (Head->Dst);
 
  return Head;
}
 
BOOLEAN
Ip4StationAddressValid (
  IN IP4_ADDR  Ip,
  IN IP4_ADDR  Netmask
  )
{
  //
  // Only support the station address with 0.0.0.0/0 to enable DHCP client.
  //
  if (Netmask == IP4_ALLZERO_ADDRESS) {
    return (BOOLEAN)(Ip == IP4_ALLZERO_ADDRESS);
  }
 
  //
  // Only support the continuous net masks
  //
  if (NetGetMaskLength (Netmask) == (IP4_MASK_MAX + 1)) {
    return FALSE;
  }
 
  //
  // Station address can't be class D or class E address
  //
  if (NetGetIpClass (Ip) > IP4_ADDR_CLASSC) {
    return FALSE;
  }
 
  return NetIp4IsUnicast (Ip, Netmask);
}