diff options
| author | David Gwynne <dlg@cvs.openbsd.org> | 2011-07-06 01:57:38 +0000 |
|---|---|---|
| committer | David Gwynne <dlg@cvs.openbsd.org> | 2011-07-06 01:57:38 +0000 |
| commit | 331b4363053aa0348db11124ffb4bbe57f433a8a (patch) | |
| tree | aafbb1d01e016aee46e6313cb4ccf591c05833ca /sys/netinet/in.h | |
| parent | 45b3845c4bcc6cce64d0a683b18f928a9bda8d6a (diff) | |
allow /31s on broadcast interfaces (eg ethernet) to work as per rfc3021.
the issue in our kernel was the broadcast address calculated on the /31
caused a ton of checks for use of broadcast addresses to kick in and
prevent one of the two addresses on the /31 from being used.
this diff basically detects if a /31 has been configured and doesnt
configure a broadcast address for it, which makes the ips usable
for normal traffic.
i wrote this so i could interoperate with "carrier" network gear
better, and sthen wants it so he can conserve address space use.
the further special casing of broadcast address handling was from claudio@
ok claudio@ markus@ sthen@ henning@
Diffstat (limited to 'sys/netinet/in.h')
| -rw-r--r-- | sys/netinet/in.h | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/sys/netinet/in.h b/sys/netinet/in.h index 979f61ff831..adfd4b31f6f 100644 --- a/sys/netinet/in.h +++ b/sys/netinet/in.h @@ -1,4 +1,4 @@ -/* $OpenBSD: in.h,v 1.89 2011/06/15 09:11:01 mikeb Exp $ */ +/* $OpenBSD: in.h,v 1.90 2011/07/06 01:57:37 dlg Exp $ */ /* $NetBSD: in.h,v 1.20 1996/02/13 23:41:47 christos Exp $ */ /* @@ -187,6 +187,12 @@ struct in_addr { #define IN_CLASSD_HOST __IPADDR(0x0fffffff) #define IN_MULTICAST(i) IN_CLASSD(i) +#define IN_RFC3021_NET __IPADDR(0xfffffffe) +#define IN_RFC3021_NSHIFT 31 +#define IN_RFC3021_HOST __IPADDR(0x00000001) +#define IN_RFC3021_SUBNET(n) (((u_int32_t)(n) & IN_RFC3021_NET) == \ + IN_RFC3021_NET) + #define IN_EXPERIMENTAL(i) (((u_int32_t)(i) & __IPADDR(0xf0000000)) == \ __IPADDR(0xf0000000)) #define IN_BADCLASS(i) (((u_int32_t)(i) & __IPADDR(0xf0000000)) == \ |