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nmap/libnetutil/ICMPv4Header.h

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/***************************************************************************
* ICMPv4Header.h -- The ICMPv4Header Class represents an ICMP version 4 *
* packet. It contains methods to set any header field. In general, these *
* methods do error checkings and byte order conversion. *
* *
***********************IMPORTANT NMAP LICENSE TERMS************************
* *
* The Nmap Security Scanner is (C) 1996-2022 Nmap Software LLC ("The Nmap *
* Project"). Nmap is also a registered trademark of the Nmap Project. *
* *
* This program is distributed under the terms of the Nmap Public Source *
* License (NPSL). The exact license text applying to a particular Nmap *
* release or source code control revision is contained in the LICENSE *
* file distributed with that version of Nmap or source code control *
* revision. More Nmap copyright/legal information is available from *
* https://nmap.org/book/man-legal.html, and further information on the *
* NPSL license itself can be found at https://nmap.org/npsl/ . This *
* header summarizes some key points from the Nmap license, but is no *
* substitute for the actual license text. *
* *
* Nmap is generally free for end users to download and use themselves, *
* including commercial use. It is available from https://nmap.org. *
* *
* The Nmap license generally prohibits companies from using and *
* redistributing Nmap in commercial products, but we sell a special Nmap *
* OEM Edition with a more permissive license and special features for *
* this purpose. See https://nmap.org/oem/ *
* *
* If you have received a written Nmap license agreement or contract *
* stating terms other than these (such as an Nmap OEM license), you may *
* choose to use and redistribute Nmap under those terms instead. *
* *
* The official Nmap Windows builds include the Npcap software *
* (https://npcap.com) for packet capture and transmission. It is under *
* separate license terms which forbid redistribution without special *
* permission. So the official Nmap Windows builds may not be *
* redistributed without special permission (such as an Nmap OEM *
* license). *
* *
* Source is provided to this software because we believe users have a *
* right to know exactly what a program is going to do before they run it. *
* This also allows you to audit the software for security holes. *
* *
* Source code also allows you to port Nmap to new platforms, fix bugs, *
* and add new features. You are highly encouraged to submit your *
* changes as a Github PR or by email to the dev@nmap.org mailing list *
* for possible incorporation into the main distribution. Unless you *
* specify otherwise, it is understood that you are offering us very *
* broad rights to use your submissions as described in the Nmap Public *
* Source License Contributor Agreement. This is important because we *
* fund the project by selling licenses with various terms, and also *
* because the inability to relicense code has caused devastating *
* problems for other Free Software projects (such as KDE and NASM). *
* *
* The free version of Nmap 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. Warranties, *
* indemnification and commercial support are all available through the *
* Npcap OEM program--see https://nmap.org/oem/ *
* *
***************************************************************************/
/* This code was originally part of the Nping tool. */
#ifndef ICMPv4HEADER_H
#define ICMPv4HEADER_H 1
#include "ICMPHeader.h"
/* ICMP types and codes. These defines were originally taken from Slirp 1.0
* source file ip_icmp.h http://slirp.sourceforge.net/ (BSD licensed) and
* then, partially modified for Nping */
#define ICMP_ECHOREPLY 0 /* Echo reply */
#define ICMP_UNREACH 3 /* Destination unreachable: */
#define ICMP_UNREACH_NET 0 /* --> Bad network */
#define ICMP_UNREACH_HOST 1 /* --> Bad host */
#define ICMP_UNREACH_PROTOCOL 2 /* --> Bad protocol */
#define ICMP_UNREACH_PORT 3 /* --> Bad port */
#define ICMP_UNREACH_NEEDFRAG 4 /* --> DF flag caused pkt drop */
#define ICMP_UNREACH_SRCFAIL 5 /* --> Source route failed */
#define ICMP_UNREACH_NET_UNKNOWN 6 /* --> Unknown network */
#define ICMP_UNREACH_HOST_UNKNOWN 7 /* --> Unknown host */
#define ICMP_UNREACH_ISOLATED 8 /* --> Source host isolated */
#define ICMP_UNREACH_NET_PROHIB 9 /* --> Prohibited access */
#define ICMP_UNREACH_HOST_PROHIB 10 /* --> Prohibited access */
#define ICMP_UNREACH_TOSNET 11 /* --> Bad TOS for network */
#define ICMP_UNREACH_TOSHOST 12 /* --> Bad TOS for host */
#define ICMP_UNREACH_COMM_PROHIB 13 /* --> Prohibited communication */
#define ICMP_UNREACH_HOSTPRECEDENCE 14 /* --> Host precedence violation */
#define ICMP_UNREACH_PRECCUTOFF 15 /* --> Precedence cutoff */
#define ICMP_SOURCEQUENCH 4 /* Source Quench. */
#define ICMP_REDIRECT 5 /* Redirect: */
#define ICMP_REDIRECT_NET 0 /* --> For the network */
#define ICMP_REDIRECT_HOST 1 /* --> For the host */
#define ICMP_REDIRECT_TOSNET 2 /* --> For the TOS and network */
#define ICMP_REDIRECT_TOSHOST 3 /* --> For the TOS and host */
#define ICMP_ECHO 8 /* Echo request */
#define ICMP_ROUTERADVERT 9 /* Router advertisement */
#define ICMP_ROUTERADVERT_MOBILE 16 /* Used by mobile IP agents */
#define ICMP_ROUTERSOLICIT 10 /* Router solicitation */
#define ICMP_TIMXCEED 11 /* Time exceeded: */
#define ICMP_TIMXCEED_INTRANS 0 /* --> TTL==0 in transit */
#define ICMP_TIMXCEED_REASS 1 /* --> TTL==0 in reassembly */
#define ICMP_PARAMPROB 12 /* Parameter problem */
#define ICMM_PARAMPROB_POINTER 0 /* --> Pointer shows the problem */
#define ICMP_PARAMPROB_OPTABSENT 1 /* --> Option missing */
#define ICMP_PARAMPROB_BADLEN 2 /* --> Bad datagram length */
#define ICMP_TSTAMP 13 /* Timestamp request */
#define ICMP_TSTAMPREPLY 14 /* Timestamp reply */
#define ICMP_INFO 15 /* Information request */
#define ICMP_INFOREPLY 16 /* Information reply */
#define ICMP_MASK 17 /* Address mask request */
#define ICMP_MASKREPLY 18 /* Address mask reply */
#define ICMP_TRACEROUTE 30 /* Traceroute */
#define ICMP_TRACEROUTE_SUCCESS 0 /* --> Dgram sent to next router */
#define ICMP_TRACEROUTE_DROPPED 1 /* --> Dgram was dropped */
#define ICMP_DOMAINNAME 37 /* Domain name request */
#define ICMP_DOMAINNAMEREPLY 38 /* Domain name reply */
#define ICMP_SECURITYFAILURES 40 /* Security failures */
#define ICMP_STD_HEADER_LEN 8
#define ICMP_MAX_PAYLOAD_LEN 1500
#define MAX_ROUTER_ADVERT_ENTRIES (((ICMP_MAX_PAYLOAD_LEN-4)/8)-1)
class ICMPv4Header : public ICMPHeader {
private:
/**********************************************************************/
/* COMMON ICMPv4 packet HEADER */
/**********************************************************************/
/* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Code | Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
+ Message Body +
| | */
struct nping_icmpv4_hdr {
u8 type; /* ICMP Message Type */
u8 code; /* ICMP Message Code */
u16 checksum; /* Checksum */
u8 data[ICMP_MAX_PAYLOAD_LEN];
}__attribute__((__packed__));
typedef struct nping_icmpv4_hdr nping_icmpv4_hdr_t;
/**********************************************************************/
/* ICMPv4 MESSAGE SPECIFIC HEADERS */
/**********************************************************************/
/* Destination Unreachable Message
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Code | Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| unused |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Internet Header + 64 bits of Original Data Datagram |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */
struct icmp4_dest_unreach_msg{
u32 unused;
//u8 original_dgram[?];
}__attribute__((__packed__));
typedef struct icmp4_dest_unreach_msg icmp4_dest_unreach_msg_t;
/* Time Exceeded Message
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Code | Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| unused |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Internet Header + 64 bits of Original Data Datagram |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */
struct icmp4_time_exceeded_msg{
u32 unused;
//u8 original_dgram[?];
}__attribute__((__packed__));
typedef struct icmp4_time_exceeded_msg icmp4_time_exceeded_msg_t;
/* Parameter Problem Message
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Code | Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Pointer | unused |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Internet Header + 64 bits of Original Data Datagram |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */
struct icmp4_parameter_problem_msg{
u8 pointer;
u8 unused[3];
//u8 original_dgram[?];
}__attribute__((__packed__));
typedef struct icmp4_parameter_problem_msg icmp4_parameter_problem_msg_t;
/* Source Quench Message
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Code | Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| unused |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Internet Header + 64 bits of Original Data Datagram |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */
struct icmp4_source_quench_msg{
u32 unused;
//u8 original_dgram[?];
}__attribute__((__packed__));
typedef struct icmp4_source_quench_msg icmp4_source_quench_msg_t;
/* Redirect Message
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Code | Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Gateway Internet Address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Internet Header + 64 bits of Original Data Datagram |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */
struct icmp4_redirect_msg{
struct in_addr gateway_address;
//u8 original_dgram[?];
}__attribute__((__packed__));
typedef struct icmp4_redirect_msg icmp4_redirect_msg_t;
/* Echo Request/Reply Message
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Code | Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Identifier | Sequence Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Data ...
+-+-+-+-+- */
struct icmp4_echo_msg{
u16 identifier;
u16 sequence;
//u8 data[?];
}__attribute__((__packed__));
typedef struct icmp4_echo_msg icmp4_echo_msg_t;
/* Timestamp Request/Reply Message
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Code | Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Identifier | Sequence Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Originate Timestamp |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Receive Timestamp |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Transmit Timestamp |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */
struct icmp4_timestamp_msg{
u16 identifier;
u16 sequence;
u32 originate_ts;
u32 receive_ts;
u32 transmit_ts;
}__attribute__((__packed__));
typedef struct icmp4_timestamp_msg icmp4_timestamp_msg_t;
/* Information Request/Reply Message
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Code | Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Identifier | Sequence Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */
struct icmp4_information_msg{
u16 identifier;
u16 sequence;
}__attribute__((__packed__));
typedef struct icmp4_information_msg icmp4_information_msg_t;
/* ICMP Router Advertisement Message
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Code | Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Num Addrs |Addr Entry Size| Lifetime |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Router Address[1] |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Preference Level[1] |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Router Address[2] |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Preference Level[2] |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| . |
| . |
| . | */
struct icmp4_router_advert_entry{
struct in_addr router_addr;
u32 preference_level;
}__attribute__((__packed__));
typedef struct icmp4_router_advert_entry icmp4_router_advert_entry_t;
struct icmp4_router_advert_msg{
u8 num_addrs;
u8 addr_entry_size;
u16 lifetime;
icmp4_router_advert_entry_t adverts[MAX_ROUTER_ADVERT_ENTRIES];
}__attribute__((__packed__));
typedef struct icmp4_router_advert_msg icmp4_router_advert_msg_t;
/* ICMP Router Solicitation Message
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Code | Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */
struct icmp4_router_solicit_msg{
u32 reserved;
}__attribute__((__packed__));
typedef struct icmp4_router_solicit_msg icmp4_router_solicit_msg_t;
/* ICMP Security Failures Message
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Code | Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Reserved | Pointer |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
~ Original Internet Headers + 64 bits of Payload ~
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */
struct icmp4_security_failures_msg{
u16 reserved;
u16 pointer;
//u8 original_headers[?];
}__attribute__((__packed__));
typedef struct icmp4_security_failures_msg icmp4_security_failures_msg_t;
/* ICMP Address Mask Request/Reply Message
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Code | Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Identifier | Sequence Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Address Mask |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */
struct icmp4_address_mask_msg{
u16 identifier;
u16 sequence;
struct in_addr address_mask;
}__attribute__((__packed__));
typedef struct icmp4_address_mask_msg icmp4_address_mask_msg_t;
/* ICMP Traceroute Message
+---------------+---------------+---------------+---------------+
| Type | Code | Checksum |
+---------------+---------------+---------------+---------------+
| ID Number | unused |
+---------------+---------------+---------------+---------------+
| Outbound Hop Count | Return Hop Count |
+---------------+---------------+---------------+---------------+
| Output Link Speed |
+---------------+---------------+---------------+---------------+
| Output Link MTU |
+---------------+---------------+---------------+---------------+ */
struct icmp4_traceroute_msg{
u16 id_number;
u16 unused;
u16 outbound_hop_count;
u16 return_hop_count;
u32 output_link_speed;
u32 output_link_mtu;
}__attribute__((__packed__));
typedef struct icmp4_traceroute_msg icmp4_traceroute_msg_t;
/* ICMP Domain Name Request Message
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Code | Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Identifier | Sequence Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */
struct icmp4_domain_name_request_msg{
u16 identifier;
u16 sequence;
}__attribute__((__packed__));
typedef struct icmp4_domain_name_request_msg icmp4_domain_name_request_msg_t;
/* ICMP Domain Name Reply Message
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Code | Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Identifier | Sequence Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Time-To-Live |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Names ...
+-+-+-+-+-+-+-+- */
struct icmp4_domain_name_reply_msg{
u16 identifier;
u16 sequence;
s16 ttl; /* Signed! */
u8 names[ICMP_MAX_PAYLOAD_LEN-8];
}__attribute__((__packed__));
typedef struct icmp4_domain_name_reply_msg icmp4_domain_name_reply_msg_t;
/* Main data structure */
nping_icmpv4_hdr_t h;
/* Helper pointers */
icmp4_dest_unreach_msg_t *h_du;
icmp4_time_exceeded_msg_t *h_te;
icmp4_parameter_problem_msg_t *h_pp;
icmp4_source_quench_msg_t *h_sq;
icmp4_redirect_msg_t *h_r;
icmp4_echo_msg_t *h_e;
icmp4_timestamp_msg_t *h_t;
icmp4_information_msg_t *h_i;
icmp4_router_advert_msg_t *h_ra;
icmp4_router_solicit_msg_t *h_rs;
icmp4_security_failures_msg_t *h_sf;
icmp4_address_mask_msg_t *h_am;
icmp4_traceroute_msg_t *h_trc;
icmp4_domain_name_request_msg_t *h_dn;
icmp4_domain_name_reply_msg_t *h_dnr;
/* Internal counts */
int routeradventries;
int domainnameentries;
public:
/* PacketElement:: Mandatory methods */
ICMPv4Header();
~ICMPv4Header();
void reset();
u8 *getBufferPointer();
int storeRecvData(const u8 *buf, size_t len);
int protocol_id() const;
int validate();
int print(FILE *output, int detail) const;
/* ICMP Type */
int setType(u8 val);
u8 getType() const;
bool validateType();
bool validateType(u8 val);
/* ICMP Code */
int setCode(u8 c);
u8 getCode() const;
bool validateCode();
bool validateCode(u8 type, u8 code);
/* Checksum */
int setSum();
int setSum(u16 s);
u16 getSum() const;
/* Unused and reserved fields */
int setUnused(u32 val);
u32 getUnused() const;
int setReserved( u32 val );
u32 getReserved() const;
/* Redirect */
int setGatewayAddress(struct in_addr ipaddr);
struct in_addr getGatewayAddress() const;
/* Parameter problem */
int setParameterPointer(u8 val);
u8 getParameterPointer() const;
/* Router advertisement */
int setNumAddresses(u8 val);
u8 getNumAddresses() const;
int setAddrEntrySize(u8 val);
u8 getAddrEntrySize() const;
int setLifetime(u16 val);
u16 getLifetime() const;
int addRouterAdvEntry(struct in_addr raddr, u32 pref);
u8 *getRouterAdvEntries(int *num) const;
int clearRouterAdvEntries();
/* Echo/Timestamp/Mask */
int setIdentifier(u16 val);
u16 getIdentifier() const;
int setSequence(u16 val);
u16 getSequence() const;
/* Timestamp only */
int setOriginateTimestamp(u32 t);
u32 getOriginateTimestamp() const;
int setReceiveTimestamp(u32 t);
u32 getReceiveTimestamp() const;
int setTransmitTimestamp(u32 t);
u32 getTransmitTimestamp() const;
/* Mask only */
int setAddressMask(struct in_addr mask);
struct in_addr getAddressMask() const;
/* Security Failures */
int setSecurityPointer(u16 val);
u16 getSecurityPointer() const;
/* Traceroute */
int setIDNumber(u16 val);
u16 getIDNumber() const;
int setOutboundHopCount(u16 val);
u16 getOutboundHopCount() const;
int setReturnHopCount(u16 val);
u16 getReturnHopCount() const;
int setOutputLinkSpeed(u32 val);
u32 getOutputLinkSpeed() const;
int setOutputLinkMTU(u32 val);
u32 getOutputLinkMTU() const;
/* Misc */
int getICMPHeaderLengthFromType( u8 type ) const;
const char *type2string(int type, int code) const;
bool isError() const;
}; /* End of class ICMPv4Header */
#endif
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