Clean up network header stuff and make it more generic. Use

libdnet when we can instead of our own home grown stuff.

SConscript:
    separate the crc code into its own file
base/inet.cc:
    move the crc stuff to crc.cc
    add generic code for calculating ip/tcp/udp checksums
base/inet.hh:
    -  move crc stuff to crc.hh
    -  #include all of the libdnet stuff.  (this makes base/inet.hh the
    only file you need to include if you want to use this kind of stuff.)
    -  Wrap some of the libdnet structs to get easier access to structure
    members.  These wrappers will automatically deal with masking/shifting/
    byte-swapping.
base/refcnt.hh:
    If one derives from RefCountingPtr, they should have access to
    the internal data pointer.
build/SConstruct:
    make #include of dnet stuff work
dev/etherlink.cc:
dev/ethertap.cc:
dev/ethertap.hh:
    EtherPacket -> PacketData
dev/etherpkt.cc:
    EtherPacket -> PacketData
    add a function for populating extra info about a packet.
    Basically just gives pointers to ethernet/ip/tcp/udp headers
    if they exist.
dev/etherpkt.hh:
    EtherPacket -> PacketData
    remove most of the packet header stuff from teh PacketData
    class and just add a few generic functions for grabbing various
    headers that may exist in the packet.  The old functionality is
    contained in the headers.
dev/ns_gige.cc:
    -  IP -> Ip, UDP -> Udp, TCP ->Tcp when used in variable names
    -  get rid of our own byte swapping functions.
    -  whack checksum code and use libdnet version.
    -  Get pointers to the various packet headers and grab info from
    those headers.  (The byte swapping in the headers now.)
    -  Add stats for Udp Checksums
dev/ns_gige.hh:
    use libdnet for checksum code.
    IP -> Ip, TCP -> Tcp in variable names
    add stats for UDP checksums

--HG--
extra : convert_revision : 96c4160e1967b7c0090acd456df4a76e1f3aab53

1 files changed, 12 insertions, 112 deletions

diff --git a/base/inet.cc b/base/inet.cc
index e2bdd19ff..ac0758c1f 100644
--- a/base/inet.cc
+++ b/base/inet.cc
@@ -33,7 +33,7 @@
 #include "sim/host.hh"
 #include "base/inet.hh"
 
-using namespace::std;
+using namespace std;
 string
 eaddr_string(const uint8_t a[6])
 {
@@ -43,119 +43,19 @@ eaddr_string(const uint8_t a[6])
     return stream.str();
 }
 
-/*
- * Copyright (c) 1988, 1992, 1993
- *	The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- *    must display the following acknowledgement:
- *	This product includes software developed by the University of
- *	California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-/***********************************************************************
-                 This section of code taken from NetBSD
-***********************************************************************/
-
-#define ETHER_CRC_POLY_LE 0xedb88320
-#define ETHER_CRC_POLY_BE 0x04c11db6
-
-#if 0
-/*
- * This is for reference.  We have a table-driven version
- * of the little-endian crc32 generator, which is faster
- * than the double-loop.
- */
-uint32_t
-crc32le(const uint8_t *buf, size_t len)
+uint16_t
+IpHdr::ip_cksum() const
 {
-    uint32_t c, crc, carry;
-    size_t i, j;
-
-    crc = 0xffffffffU;      /* initial value */
-
-    for (i = 0; i < len; i++) {
-        c = buf[i];
-        for (j = 0; j < 8; j++) {
-            carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01);
-            crc >>= 1;
-            c >>= 1;
-            if (carry)
-                crc = (crc ^ ETHER_CRC_POLY_LE);
-        }
-    }
-
-    return (crc);
-}
-#else
-uint32_t
-crc32le(const uint8_t *buf, size_t len)
-{
-    static const uint32_t crctab[] = {
-        0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
-        0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
-        0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
-        0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
-    };
-    uint32_t crc;
-    int i;
-
-    crc = 0xffffffffU;      /* initial value */
-
-    for (i = 0; i < len; i++) {
-        crc ^= buf[i];
-        crc = (crc >> 4) ^ crctab[crc & 0xf];
-        crc = (crc >> 4) ^ crctab[crc & 0xf];
-    }
-
-    return (crc);
+    uint16_t sum = ip_cksum_add(this, hlen(), 0);
+    return ip_cksum_carry(sum);
 }
-#endif
 
-uint32_t
-crc32be(const uint8_t *buf, size_t len)
+uint16_t
+IpHdr::tu_cksum() const
 {
-    uint32_t c, crc, carry;
-    size_t i, j;
-
-    crc = 0xffffffffU;      /* initial value */
-
-    for (i = 0; i < len; i++) {
-        c = buf[i];
-        for (j = 0; j < 8; j++) {
-            carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01);
-            crc <<= 1;
-            c >>= 1;
-            if (carry)
-                crc = (crc ^ ETHER_CRC_POLY_BE) | carry;
-        }
-    }
-
-    return (crc);
+    uint16_t sum = ip_cksum_add(payload(), len() - hlen(), 0);
+    sum = ip_cksum_add(&ip_src, 4, sum);
+    sum = ip_cksum_add(&ip_dst, 4, sum);
+    sum += htons(ip_p + ip_len);
+    return ip_cksum_carry(sum);
 }
-
-/***********************************************************************
-                 This is the end of the NetBSD code
-***********************************************************************/