lo has that link1 wankery where it kind of replies to all addresses in
the subnet, except that it doesn't really - it is very halfbaked and
gets in the way. unless somebody has a VERY convincing reason to keep
this it'll be gone in a few.
we'll be able to use the fast rb tree lookup in in_aiwithaddr after
this.
Index: sys/netinet/ip_input.c
===================================================================
RCS file: /cvs/src/sys/netinet/ip_input.c,v
retrieving revision 1.186
diff -u -p -r1.186 ip_input.c
--- sys/netinet/ip_input.c 11 Feb 2011 12:16:30 -0000 1.186
+++ sys/netinet/ip_input.c 2 Apr 2011 12:44:12 -0000
@@ -688,10 +688,7 @@ in_iawithaddr(struct in_addr ina, struct
TAILQ_FOREACH(ia, &in_ifaddr, ia_list) {
if (ia->ia_ifp->if_rdomain != rdomain)
continue;
- if ((ina.s_addr == ia->ia_addr.sin_addr.s_addr) ||
- ((ia->ia_ifp->if_flags & (IFF_LOOPBACK|IFF_LINK1)) ==
- (IFF_LOOPBACK|IFF_LINK1) &&
- ia->ia_net == (ina.s_addr & ia->ia_netmask)))
+ if (ina.s_addr == ia->ia_addr.sin_addr.s_addr)
return ia;
/* check ancient classful too, e. g. for rarp-based netboot */
if (((ip_directedbcast == 0) || (m && ip_directedbcast &&
Index: share/man/man4/lo.4
===================================================================
RCS file: /cvs/src/share/man/man4/lo.4,v
retrieving revision 1.26
diff -u -p -r1.26 lo.4
--- share/man/man4/lo.4 31 May 2007 19:19:50 -0000 1.26
+++ share/man/man4/lo.4 2 Apr 2011 12:44:12 -0000
@@ -70,33 +70,6 @@ The loopback should
.Em never
be configured first unless no hardware
interfaces exist.
-.Pp
-Configuring a loopback interface for
-.Xr inet 4
-with the
-.Em link1
-flag set will make the interface answer to the whole set of
-addresses identified as being in super-net which is specified
-by the address and netmask.
-Obviously you should not set the
-.Em link1
-flag on interface
-.Nm lo0 ,
-but instead use another interface like
-.Nm lo1 .
-.Sh EXAMPLES
-.Bd -literal
-# ifconfig lo1 create
-# ifconfig lo1 inet 192.168.1.1 netmask 255.255.255.0 link1
-.Ed
-.Pp
-is equivalent to:
-.Bd -literal
-# ifconfig lo1 create
-# awk 'BEGIN {for(i=1;i<255;i++) \e
- print "ifconfig lo1 inet 192.168.1."i" netmask 255.255.255.255
alias"}'| \e
- sh
-.Ed
.Sh DIAGNOSTICS
.Bl -diag
.It lo%d: can't handle af%d.
@@ -116,16 +89,8 @@ The
.Nm
device appeared in
.Bx 4.2 .
-.Pp
-The wildcard functionality first appeared in
-.Ox 2.3 .
.Sh BUGS
Previous versions of the system enabled the loopback interface
automatically, using a non-standard Internet address (127.1).
Use of that address is now discouraged; a reserved host address
for the local network should be used instead.
-.Pp
-Care should be taken when using NAT with interfaces that have the
-.Em link1
-flag set, because it may believe the packets are coming from a
-loopback address.
--
Henning Brauer, [email protected], [email protected]
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