[PATCH] ping: decode unreachable codes added in RFC 4443

[Enrik Berkhan]

RFC 4443 added two new codes for ICMPv6 destination unreachable messages
(type 1):

5 - Source address failed ingress/egress policy
6 - Reject route to destination

Before:

$ sudo ./ping/ping6 2a03:4000:54:b9a::5
PING 2a03:4000:54:b9a::5 (2a03:4000:54:b9a::5): 56 data bytes
64 bytes from 2a03:4000:54:b9a::5: Destination unreachable: Unknown code 6
64 bytes from 2a03:4000:54:b9a::5: Destination unreachable: Unknown code 6
64 bytes from 2a03:4000:54:b9a::5: Destination unreachable: Unknown code 6
^C--- 2a03:4000:54:b9a::5 ping statistics ---
3 packets transmitted, 0 packets received, 100% packet loss

After:

$ sudo ./ping/ping6 2a03:4000:54:b9a::5
PING 2a03:4000:54:b9a::5 (2a03:4000:54:b9a::5): 56 data bytes
64 bytes from 2a03:4000:54:b9a::5: Destination unreachable: Reject route to 
destination
64 bytes from 2a03:4000:54:b9a::5: Destination unreachable: Reject route to 
destination
64 bytes from 2a03:4000:54:b9a::5: Destination unreachable: Reject route to 
destination
^C--- 2a03:4000:54:b9a::5 ping statistics ---
3 packets transmitted, 0 packets received, 100% packet loss

Signed-off-by: Enrik Berkhan <Enrik.Berkhan@inka.de>
---
 ping/ping6.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/ping/ping6.c b/ping/ping6.c
index 91b60dd6..1e458507 100644
--- a/ping/ping6.c
+++ b/ping/ping6.c
@@ -55,6 +55,16 @@
 #include "ping6.h"
 #include "libinetutils.h"
 
+/* RFC 4443 addition not yet available in libc headers */
+#ifndef ICMP6_DST_UNREACH_POLICYFAIL
+#define ICMP6_DST_UNREACH_POLICYFAIL 5
+#endif
+
+/* RFC 4443 addition not yet available in libc headers */
+#ifndef ICMP6_DST_UNREACH_REJECTROUTE
+#define ICMP6_DST_UNREACH_REJECTROUTE 6
+#endif
+
 static PING *ping;
 bool is_root = false;
 unsigned char *data_buffer;
@@ -637,6 +647,8 @@ static struct icmp_code_descr icmp_dest_unreach_desc[] = {
   {ICMP6_DST_UNREACH_BEYONDSCOPE, "Beyond scope of source address"},
   {ICMP6_DST_UNREACH_ADDR, "Address unreachable"},
   {ICMP6_DST_UNREACH_NOPORT, "Port unreachable"},
+  {ICMP6_DST_UNREACH_POLICYFAIL, "Source address failed ingress/egress 
policy"},
+  {ICMP6_DST_UNREACH_REJECTROUTE, "Reject route to destination"},
 };
 
 static void
-- 
2.34.1