I tried emulating ip in ns2 to create ipv6, just to increase header size to
emulate ipv6 and make use of fid field and priority field.
After duplicatin the ip.cc/h to ipv6.cc/h. I changed the variable names to
reflect
ipv6 i.e append v6 to places where ip are.
/ns-2.28/common/ipv6.cc
#ifndef lint
static const char rcsid[] =
"@(#) $Header: /nfs/jade/vint/CVSROOT/ns-2/common/ip.cc,v 1.8 1998/08/12
23:41:05 gnguyen Exp $";
#endif
#include "packet.h"
#include "ipv6.h"
int hdr_ipv6::offset_;
static class IPHeaderClass : public PacketHeaderClass {
public:
IPHeaderClass() : PacketHeaderClass("PacketHeader/IPV6",
sizeof(hdr_ipv6)) {
bind_offset(&hdr_ipv6::offset_);
}
void export_offsets() {
field_offset("src_", OFFSET(hdr_ipv6, src_));
field_offset("dst_", OFFSET(hdr_ipv6, dst_));
field_offset("ttl_", OFFSET(hdr_ipv6, ttl_));
field_offset("fid_", OFFSET(hdr_ipv6, fid_));
field_offset("prio_", OFFSET(hdr_ipv6, prio_));
}
} class_iphdrv6;
/ns-2.28/common/ipv6.h
/* a network layer; basically like IPv6 */
#ifndef ns_ip_h
#define ns_ip_h
#include "config.h"
#include "packet.h"
#define IP_HDR_LEN 40
#define IP_DEF_TTL 32
// The following undef is to suppress warnings on systems were
// IP_BROADCAST is defined.
#ifdef IP_BROADCAST
#undef IP_BROADCAST
#endif
#define IP_BROADCAST ((u_int32_t) 0xffffffff)
struct hdr_ipv6 {
/* common to IPv{4,6} */
ns_addr_t src_;
ns_addr_t dst_;
int ttl_;
/* Monarch extn */
// u_int16_t sport_;
// u_int16_t dport_;
/* IPv6 */
int fid_; /* flow id */
int prio_;
static int offset_;
inline static int& offset() { return offset_; }
inline static hdr_ipv6* access(const Packet* p) {
return (hdr_ipv6*) p->access(offset_);
}
/* per-field member acces functions */
ns_addr_t& src() { return (src_); }
nsaddr_t& saddr() { return (src_.addr_); }
int32_t& sport() { return src_.port_;}
ns_addr_t& dst() { return (dst_); }
nsaddr_t& daddr() { return (dst_.addr_); }
int32_t& dport() { return dst_.port_;}
int& ttl() { return (ttl_); }
/* ipv6 fields */
int& flowid() { return (fid_); }
int& prio() { return (prio_); }
};
#endif
After this, I made modifications to:
/ns-2.28/common/packet.h
#define HDR_MAC_TDMA(p) ((hdr_mac_tdma *)hdr_mac::access(p))
#define HDR_SMAC(p) ((hdr_smac *)hdr_mac::access(p))
#define HDR_LL(p) (hdr_ll::access(p))
#define HDR_IP(p) (hdr_ip::access(p))
//Added by Omotayo Lekan for IPv6
#define HDR_IPV6(p) (hdr_ipv6::access(p))
#define HDR_RTP(p) (hdr_rtp::access(p))
#define HDR_TCP(p) (hdr_tcp::access(p))
#define HDR_SCTP(p) (hdr_sctp::access(p))
changes in ns-2.28/tcl/lib/ns-packet.tcl
Encap
Flags
HttpInval
IMEP
IP
# Added by Omotayo Lekan, IPv6 modification
IPV6
IPinIP
IVS
LDP
LL
mcastCtrl
MFTP
MPLS
no changes were made to ns-2.28/common/packet.cc, ns-2.28/tcl/lib/ns-
default.tcl, ns-2.28/tcl/lib/ns-lib
--- Classfier::no-slot{} default handler (tcl/lib/ns-lib.tcl) ---
_o21: no target for slot 31
_o21 type: Classifier/Addr
content dump:
classifier _o21
0 offset
11 shift
2047 mask
0 slots
---------- Finished standard no-slot{} default handler ----------
