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MdeModulePkg: Update NetLib interface to support classless addressing. 

The classful addressing (IP class A/B/C) has been deprecated according to
RFC4632. This patch updates the NetLib NetGetIpClass() and NetIp4IsUnicast()
accordingly.

NetGetIpClass()
The function is kept for compatibility, while the caller of this function
could only check the returned value against with IP4_ADDR_CLASSD (multicast)
or IP4_ADDR_CLASSE (reserved) now. The function has been updated to note this.

NetIp4IsUnicast()
The NetMask becomes a required parameter to check the unicast address.

Contributed-under: TianoCore Contribution Agreement 1.0
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 2016-10-27 09:22:08 +08:00
parent 6440385b17
commit 3289dcba45
2 changed files with 26 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
MdeModulePkg/Include/Library/NetLib.h
View File

@ -43,9 +43,9 @@ typedef UINT16 TCP_PORTNO;
//
// The address classification
//
#define IP4_ADDR_CLASSA 1
#define IP4_ADDR_CLASSB 2
#define IP4_ADDR_CLASSC 3
#define IP4_ADDR_CLASSA 1 // Deprecated
#define IP4_ADDR_CLASSB 2 // Deprecated
#define IP4_ADDR_CLASSC 3 // Deprecated
#define IP4_ADDR_CLASSD 4
#define IP4_ADDR_CLASSE 5
@ -231,6 +231,7 @@ typedef struct {
// Test the IP's attribute, All the IPs are in host byte order.
//
#define IP4_IS_MULTICAST(Ip) (((Ip) & 0xF0000000) == 0xE0000000)
#define IP4_IS_UNSPECIFIED(Ip) ((Ip) == 0)
#define IP4_IS_LOCAL_BROADCAST(Ip) ((Ip) == 0xFFFFFFFF)
#define IP4_NET_EQUAL(Ip1, Ip2, NetMask) (((Ip1) & (NetMask)) == ((Ip2) & (NetMask)))
#define IP4_IS_VALID_NETMASK(Ip) (NetGetMaskLength (Ip) != (IP4_MASK_MAX + 1))
@ -379,6 +380,11 @@ NetGetMaskLength (
Return the class of the IP address, such as class A, B, C.
Addr is in host byte order.
[ATTENTION]
Classful addressing (IP class A/B/C) has been deprecated according to RFC4632.
Caller of this function could only check the returned value against
IP4_ADDR_CLASSD (multicast) or IP4_ADDR_CLASSE (reserved) now.
The address of class A starts with 0.
If the address belong to class A, return IP4_ADDR_CLASSA.
The address of class B starts with 10.
@ -404,17 +410,16 @@ NetGetIpClass (
/**
Check whether the IP is a valid unicast address according to
the netmask. If NetMask is zero, use the IP address's class to get the default mask.
the netmask.
If Ip is 0, IP is not a valid unicast address.
Class D address is used for multicasting and class E address is reserved for future. If Ip
belongs to class D or class E, Ip is not a valid unicast address.
If all bits of the host address of Ip are 0 or 1, Ip is not a valid unicast address.
ASSERT if NetMask is zero.
If all bits of the host address of IP are 0 or 1, IP is also not a valid unicast address.
@param[in] Ip The IP to check against.
@param[in] NetMask The mask of the IP.
@return TRUE if Ip is a valid unicast address on the network, otherwise FALSE.
@return TRUE if IP is a valid unicast address on the network, otherwise FALSE.
**/
BOOLEAN

26
MdeModulePkg/Library/DxeNetLib/DxeNetLib.c
View File

@ -580,6 +580,11 @@ NetGetMaskLength (
Return the class of the IP address, such as class A, B, C.
Addr is in host byte order.
[ATTENTION]
Classful addressing (IP class A/B/C) has been deprecated according to RFC4632.
Caller of this function could only check the returned value against
IP4_ADDR_CLASSD (multicast) or IP4_ADDR_CLASSE (reserved) now.
The address of class A starts with 0.
If the address belong to class A, return IP4_ADDR_CLASSA.
The address of class B starts with 10.
@ -628,11 +633,10 @@ NetGetIpClass (
/**
Check whether the IP is a valid unicast address according to
the netmask. If NetMask is zero, use the IP address's class to get the default mask.
the netmask.
If Ip is 0, IP is not a valid unicast address.
Class D address is used for multicasting and class E address is reserved for future. If Ip
belongs to class D or class E, IP is not a valid unicast address.
ASSERT if NetMask is zero.
If all bits of the host address of IP are 0 or 1, IP is also not a valid unicast address.
@param[in] Ip The IP to check against.
@ -648,18 +652,12 @@ NetIp4IsUnicast (
IN IP4_ADDR NetMask
)
{
INTN Class;
Class = NetGetIpClass (Ip);
if ((Ip == 0) || (Class >= IP4_ADDR_CLASSD)) {
ASSERT (NetMask != 0);
if (Ip == 0 || IP4_IS_LOCAL_BROADCAST (Ip)) {
return FALSE;
}
if (NetMask == 0) {
NetMask = gIp4AllMasks[Class << 3];
}
if (((Ip &~NetMask) == ~NetMask) || ((Ip &~NetMask) == 0)) {
return FALSE;
}