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/*
* Copyright 2013 Google Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
/*
* Author: ncardwell@google.com (Neal Cardwell)
*
* Interface and type declarations for packetdrill's representation of
* packet headers. We support multi-layer encapsulation. In order to
* make it easier to iterate through all the headers in a packet, we
* keep separate, explicit metadata about the types and locations of
* headers in a packet.
*/
#ifndef __HEADER_H__
#define __HEADER_H__
#include "types.h"
#include <sys/time.h>
#include "assert.h"
#include "gre.h"
#include "icmp.h"
#include "icmpv6.h"
#include "ip.h"
#include "ipv6.h"
#include "mpls.h"
#include "tcp.h"
#include "udp.h"
struct packet;
/* The type of a header in a packet. */
enum header_t {
HEADER_NONE,
HEADER_IPV4,
HEADER_IPV6,
HEADER_GRE,
HEADER_MPLS,
HEADER_TCP,
HEADER_UDP,
HEADER_ICMPV4,
HEADER_ICMPV6,
HEADER_NUM_TYPES
};
/* Metadata about a header in a packet. We support multi-layer encapsulation. */
struct header {
enum header_t type; /* type of this header */
u32 header_bytes; /* length of this header */
u32 total_bytes; /* length of header plus data inside */
union {
u8 *ptr; /* a pointer to the header bits */
struct ipv4 *ipv4;
struct ipv6 *ipv6;
struct gre *gre;
struct mpls *mpls;
struct tcp *tcp;
struct udp *udp;
struct icmpv4 *icmpv4;
struct icmpv6 *icmpv6;
} h;
};
/* Info for a particular type of header. */
struct header_type_info {
const char* name; /* human-readable protocol name */
u8 ip_proto; /* IP protocol code */
u16 eth_proto; /* Ethernet protocol code */
/* Call this to finalize the header once we know what's inside... */
int (*finish)(struct packet *packet,
struct header *header, struct header *next_inner);
};
/* Return the info for the given type of header. */
extern struct header_type_info *header_type_info(enum header_t header_type);
#endif /* __HEADER_H__ */
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