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Added a fix for a bug which caused the wrong interface to be selected

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for broadcasts if point-to-point links shared the same IP address as
the ethernet. The fix must be enabled with P2P_LOCALADDR_SHARE option
in the kernel config file. This will someday likely be standard, but
there isn't sufficient time before release to determine if there are
any interoperability problems with routed and/or gated.

Reviewed by:	Garrett Wollman, and me
Submitted by:	Peter Wemm
This commit is contained in:
David Greenman 1995-05-27 04:37:24 +00:00
parent b8e91dab53
commit b2af64fd03
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=8788
1 changed files with 44 additions and 27 deletions
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71
sys/net/if.c
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@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)if.c 8.3 (Berkeley) 1/4/94
* $Id: if.c,v 1.12 1994/12/30 06:46:20 davidg Exp $
* $Id: if.c,v 1.13 1995/02/24 11:47:31 davidg Exp $
*/
#include <sys/param.h>
@ -233,24 +233,33 @@ ifa_ifwithnet(addr)
if (sdl->sdl_index && sdl->sdl_index <= if_index)
return (ifnet_addrs[sdl->sdl_index - 1]);
}
for (ifp = ifnet; ifp; ifp = ifp->if_next)
for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) {
register char *cp, *cp2, *cp3;
for (ifp = ifnet; ifp; ifp = ifp->if_next) {
for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) {
register char *cp, *cp2, *cp3;
if (ifa->ifa_addr->sa_family != af || ifa->ifa_netmask == 0)
next: continue;
cp = addr_data;
cp2 = ifa->ifa_addr->sa_data;
cp3 = ifa->ifa_netmask->sa_data;
cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask;
while (cp3 < cplim)
if ((*cp++ ^ *cp2++) & *cp3++)
goto next;
if (ifa_maybe == 0 ||
rn_refines((caddr_t)ifa->ifa_netmask,
(caddr_t)ifa_maybe->ifa_netmask))
ifa_maybe = ifa;
}
if (ifa->ifa_addr->sa_family != af || ifa->ifa_netmask == 0)
next: continue;
#ifdef P2P_LOCALADDR_SHARE
if (ifp->if_flags & IFF_POINTOPOINT) {
if (equal(addr, ifa->ifa_addr))
return (ifa);
} else
#endif /* P2P_LOCALADDR_SHARE */
{
cp = addr_data;
cp2 = ifa->ifa_addr->sa_data;
cp3 = ifa->ifa_netmask->sa_data;
cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask;
while (cp3 < cplim)
if ((*cp++ ^ *cp2++) & *cp3++)
goto next;
if (ifa_maybe == 0 ||
rn_refines((caddr_t)ifa->ifa_netmask,
(caddr_t)ifa_maybe->ifa_netmask))
ifa_maybe = ifa;
}
}
}
return (ifa_maybe);
}
@ -298,15 +307,23 @@ ifaof_ifpforaddr(addr, ifp)
return (ifa);
continue;
}
cp = addr->sa_data;
cp2 = ifa->ifa_addr->sa_data;
cp3 = ifa->ifa_netmask->sa_data;
cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask;
for (; cp3 < cplim; cp3++)
if ((*cp++ ^ *cp2++) & *cp3)
break;
if (cp3 == cplim)
return (ifa);
#ifdef P2P_LOCALADDR_SHARE
if (ifp->if_flags & IFF_POINTOPOINT) {
if (equal(addr, ifa->ifa_dstaddr))
return (ifa);
} else
#endif /* P2P_LOCALADDR_SHARE */
{
cp = addr->sa_data;
cp2 = ifa->ifa_addr->sa_data;
cp3 = ifa->ifa_netmask->sa_data;
cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask;
for (; cp3 < cplim; cp3++)
if ((*cp++ ^ *cp2++) & *cp3)
break;
if (cp3 == cplim)
return (ifa);
}
}
return (ifa_maybe);
}