Commit 2b246b25 authored by Andreas Roeseler's avatar Andreas Roeseler Committed by David S. Miller
Browse files

icmp: add support for RFC 8335 PROBE 



Add definitions for PROBE ICMP types and codes.

Add AFI definitions for IP and IPV6 as specified by IANA

Add a struct to represent the additional header when probing by IP
address (ctype == 3) for use in parsing incoming PROBE messages

Add a struct to represent the entire Interface Identification Object
(IIO) section of an incoming PROBE packet

Signed-off-by: default avatarAndreas Roeseler <andreas.a.roeseler@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent fdb5cc6a

include/uapi/linux/icmp.h

+42 −0
Original line number Diff line number Diff line
@@ -20,6 +20,9 @@ 


#include <linux/types.h>

#include <asm/byteorder.h>

#include <linux/in.h>

#include <linux/if.h>

#include <linux/in6.h>



#define ICMP_ECHOREPLY		0	/* Echo Reply			*/

#define ICMP_DEST_UNREACH	3	/* Destination Unreachable	*/
@@ -66,6 +69,23 @@ 
#define ICMP_EXC_TTL		0	/* TTL count exceeded		*/

#define ICMP_EXC_FRAGTIME	1	/* Fragment Reass time exceeded	*/



/* Codes for EXT_ECHO (PROBE) */

#define ICMP_EXT_ECHO		42

#define ICMP_EXT_ECHOREPLY	43

#define ICMP_EXT_MAL_QUERY	1	/* Malformed Query */

#define ICMP_EXT_NO_IF		2	/* No such Interface */

#define ICMP_EXT_NO_TABLE_ENT	3	/* No such Table Entry */

#define ICMP_EXT_MULT_IFS	4	/* Multiple Interfaces Satisfy Query */



/* Constants for EXT_ECHO (PROBE) */

#define EXT_ECHOREPLY_ACTIVE	(1 << 2)/* active bit in reply message */

#define EXT_ECHOREPLY_IPV4	(1 << 1)/* ipv4 bit in reply message */

#define EXT_ECHOREPLY_IPV6	1	/* ipv6 bit in reply message */

#define EXT_ECHO_CTYPE_NAME	1

#define EXT_ECHO_CTYPE_INDEX	2

#define EXT_ECHO_CTYPE_ADDR	3

#define ICMP_AFI_IP		1	/* Address Family Identifier for ipv4 */

#define ICMP_AFI_IP6		2	/* Address Family Identifier for ipv6 */



struct icmphdr {

  __u8		type;
@@ -118,4 +138,26 @@ struct icmp_extobj_hdr { 
	__u8		class_type;

};



/* RFC 8335: 2.1 Header for c-type 3 payload */

struct icmp_ext_echo_ctype3_hdr {

	__be16		afi;

	__u8		addrlen;

	__u8		reserved;

};



/* RFC 8335: 2.1 Interface Identification Object */

struct icmp_ext_echo_iio {

	struct icmp_extobj_hdr extobj_hdr;

	union {

		char name[IFNAMSIZ];

		__be32 ifindex;

		struct {

			struct icmp_ext_echo_ctype3_hdr ctype3_hdr;

			union {

				struct in_addr	ipv4_addr;

				struct in6_addr	ipv6_addr;

			} ip_addr;

		} addr;

	} ident;

};

#endif /* _UAPI_LINUX_ICMP_H */