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icmp: add support for RFC 8335 PROBE

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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: Andreas Roeseler <andreas.a.roeseler@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andreas Roeseler 2021-03-29 18:45:15 -07:00 committed by David S. Miller
parent fdb5cc6ab3
commit 2b246b2569
1 changed files with 42 additions and 0 deletions
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42
include/uapi/linux/icmp.h
View file

@ -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 */