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.roese...@gmail.com>
---
Changes since v1:
- Add AFI_IP and AFI_IP6 definitions
Changes since v2:
Suggested by Willem de Brujin <willemdebrujin.ker...@gmail.com>
- Add prefix for PROBE specific defined variables
- Create struct icmp_ext_echo_iio for parsing incoming packet
---
include/uapi/linux/icmp.h | 40 +++++++++++++++++++++++++++++++++++++++
1 file changed, 40 insertions(+)
diff --git a/include/uapi/linux/icmp.h b/include/uapi/linux/icmp.h
index fb169a50895e..166ca77561de 100644
--- a/include/uapi/linux/icmp.h
+++ b/include/uapi/linux/icmp.h
@@ -66,6 +66,23 @@
#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)/* position of active flag in reply */
+#define EXT_ECHOREPLY_IPV4 (1 << 1)/* position of ipv4 flag in reply */
+#define EXT_ECHOREPLY_IPV6 1 /* position of ipv6 flag in reply */
+#define EXT_ECHO_CTYPE_NAME 1
+#define EXT_ECHO_CTYPE_INDEX 2
+#define EXT_ECHO_CTYPE_ADDR 3
+#define EXT_ECHO_AFI_IP 1 /* Address Family Identifier
for IPV4 */
+#define EXT_ECHO_AFI_IP6 2 /* Address Family Identifier for IPV6 */
struct icmphdr {
__u8 type;
@@ -118,4 +135,27 @@ struct icmp_extobj_hdr {
__u8 class_type;
};
+/* RFC 8335: 2.1 Header for C-type 3 payload */
+struct icmp_ext_echo_ctype3_hdr {
+ __u16 afi;
+ __u8 addrlen;
+ __u8 reserved;
+};
+
+/* RFC 8335: Interface Identification Object */
+struct icmp_ext_echo_iio {
+ struct icmp_extobj_hdr extobj_hdr;
+ union {
+ __u32 ifIndex;
+ char name;
+ struct {
+ struct icmp_ext_echo_ctype3_hdr ctype3_hdr;
+ union {
+ __be32 ipv4_addr;
+ struct in6_addr ipv6_addr;
+ } ip_addr;
+ } addr;
+ } ident;
+};
+
#endif /* _UAPI_LINUX_ICMP_H */
--
2.25.1
