[patch] NetworkPkg: Support bracketed IPv6 address during a redirection in iSCSI

[Zhang Lubo <lubo.zhang@intel.com>]

According to RFC 3720, the TargetAddress provided in a redirection
might be a DNS host name, a dotted-decimal IPv4 address, or a
bracketed IPv6 address. Current ISCSI driver in Networkpkg only
supports dotted-decimal IPv4 address, so we need add IPv6 address
support since it is a combo driver supporting dual stack.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Zhang Lubo <lubo.zhang@intel.com>
Cc: Ye Ting <ting.ye@intel.com>
Cc: Fu Siyuan <siyuan.fu@intel.com>
Cc: Wu Jiaxin <jiaxin.wu@intel.com>
---
 NetworkPkg/IScsiDxe/IScsiProto.c | 51 ++++++++++++++++++++++++++++++----------
 NetworkPkg/IScsiDxe/IScsiProto.h |  5 +++-
 2 files changed, 43 insertions(+), 13 deletions(-)

diff --git a/NetworkPkg/IScsiDxe/IScsiProto.c b/NetworkPkg/IScsiDxe/IScsiProto.c
index 5092365..a9bf491 100644
--- a/NetworkPkg/IScsiDxe/IScsiProto.c
+++ b/NetworkPkg/IScsiDxe/IScsiProto.c
@@ -1087,26 +1087,53 @@ IScsiUpdateTargetAddress (
     TargetAddress = IScsiGetValueByKeyFromList (KeyValueList, ISCSI_KEY_TARGET_ADDRESS);
     if (TargetAddress == NULL) {
       break;
     }
 
-    if (!NET_IS_DIGIT (TargetAddress[0])) {
+    //
+    // RFC 3720 defines format of the TargetAddress=domainname[:port][,portal-group-tag]
+    // The domainname can be specified as either a DNS host name, adotted-decimal IPv4 address,
+    // or a bracketed IPv6 address as specified in [RFC2732].
+    //
+    if (NET_IS_DIGIT (TargetAddress[0])) {
       //
-      // The domainname of the target may be presented in three formats: a DNS host name,
-      // a dotted-decimal IPv4 address, or a bracketed IPv6 address. Only accept dotted
-      // IPv4 address.
+      // The domainname of the target is presented in a dotted-decimal IPv4 address format.
       //
-      continue;
-    }
-
-    IpStr = TargetAddress;
+      IpStr = TargetAddress;
 
-    while ((*TargetAddress != 0) && (*TargetAddress != ':') && (*TargetAddress != ',')) {
+      while ((*TargetAddress != '\0') && (*TargetAddress != ':') && (*TargetAddress != ',')) {
+        //
+        // NULL, ':', or ',' ends the IPv4 string.
+        //
+        TargetAddress++;
+      }
+      
+    } else if (*TargetAddress == ISCSI_REDIRECT_ADDR_START_DELIMITER){
       //
-      // NULL, ':', or ',' ends the IPv4 string.
+      // The domainname of the target is presented in a bracketed IPv6 address format.
       //
-      TargetAddress++;
+      TargetAddress ++;
+      IpStr = TargetAddress;
+      while ((*TargetAddress != '\0') && (*TargetAddress != ISCSI_REDIRECT_ADDR_END_DELIMITER)) {
+        //
+        // ']' ends the IPv6 string.
+        //
+        TargetAddress++;
+      }
+
+      if (*TargetAddress != ISCSI_REDIRECT_ADDR_END_DELIMITER) {
+        continue;
+      }
+
+      *TargetAddress = '\0';
+      TargetAddress ++;
+
+    } else {
+      //
+      // The domainname of the target is presented in the format of a DNS host name.
+      // Temporary not supported.
+      continue;
     }
 
     if (*TargetAddress == ',') {
       //
       // Comma and the portal group tag MUST be ommitted if the TargetAddress is sent
@@ -1124,11 +1151,11 @@ IScsiUpdateTargetAddress (
       } else {
         Session->ConfigData->SessionConfigData.TargetPort = (UINT16) Number;
       }
     } else {
       //
-      // The string only contains the IPv4 address. Use the well-known port.
+      // The string only contains the Target address. Use the well-known port.
       //
       Session->ConfigData->SessionConfigData.TargetPort = ISCSI_WELL_KNOWN_PORT;
     }
     //
     // Update the target IP address.
diff --git a/NetworkPkg/IScsiDxe/IScsiProto.h b/NetworkPkg/IScsiDxe/IScsiProto.h
index 8099f34..367914d 100644
--- a/NetworkPkg/IScsiDxe/IScsiProto.h
+++ b/NetworkPkg/IScsiDxe/IScsiProto.h
@@ -1,9 +1,9 @@
 /** @file
   The header file of iSCSI Protocol that defines many specific data structures.
 
-Copyright (c) 2004 - 2014, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2004 - 2016, Intel Corporation. All rights reserved.<BR>
 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
 
@@ -38,10 +38,13 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 #define DEFAULT_MAX_OUTSTANDING_R2T             1
 
 #define ISCSI_VERSION_MAX                       0x00
 #define ISCSI_VERSION_MIN                       0x00
 
+#define ISCSI_REDIRECT_ADDR_START_DELIMITER     '['
+#define ISCSI_REDIRECT_ADDR_END_DELIMITER       ']'
+
 #define ISCSI_KEY_AUTH_METHOD                   "AuthMethod"
 #define ISCSI_KEY_HEADER_DIGEST                 "HeaderDigest"
 #define ISCSI_KEY_DATA_DIGEST                   "DataDigest"
 #define ISCSI_KEY_MAX_CONNECTIONS               "MaxConnections"
 #define ISCSI_KEY_TARGET_NAME                   "TargetName"
-- 
1.9.5.msysgit.1