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Change lowest address on subnet (host 0) not to broadcast by default.

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The address with a host part of all zeros was used as a broadcast long
ago, but the default has been all ones since 4.3BSD and RFC1122.  Until
now, we would broadcast the host zero address as well as the configured
address.  Change to not broadcasting that address by default, but add a
sysctl (net.inet.ip.broadcast_lowest) to re-enable it.  Note that the
correct way to use the zero address for broadcast would be to configure
it as the broadcast address for the network.

See https:/datatracker.ietf.org/doc/draft-schoen-intarea-lowest-address/
and the discussion in https://reviews.freebsd.org/D19316.  Note, Linux
now implements this.

Reviewed by:	rgrimes, tuexen; melifaro (previous version)
MFC after:	1 month
Relnotes:	yes
Differential Revision: https://reviews.freebsd.org/D31861
This commit is contained in:
Mike Karels 2021-09-05 13:14:04 -05:00
parent b43d7aa09b
commit fd0765933c
1 changed files with 8 additions and 2 deletions
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10
sys/netinet/in.c
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@ -88,6 +88,12 @@ SYSCTL_INT(_net_inet_ip, OID_AUTO, no_same_prefix, CTLFLAG_VNET | CTLFLAG_RW,
&VNET_NAME(nosameprefix), 0,
"Refuse to create same prefixes on different interfaces");
VNET_DEFINE_STATIC(bool, broadcast_lowest);
#define V_broadcast_lowest VNET(broadcast_lowest)
SYSCTL_BOOL(_net_inet_ip, OID_AUTO, broadcast_lowest, CTLFLAG_VNET | CTLFLAG_RW,
&VNET_NAME(broadcast_lowest), 0,
"Treat lowest address on a subnet (host 0) as broadcast");
VNET_DECLARE(struct inpcbinfo, ripcbinfo);
#define V_ripcbinfo VNET(ripcbinfo)
@ -1170,10 +1176,10 @@ in_ifaddr_broadcast(struct in_addr in, struct in_ifaddr *ia)
return ((in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
/*
* Check for old-style (host 0) broadcast, but
* Optionally check for old-style (host 0) broadcast, but
* taking into account that RFC 3021 obsoletes it.
*/
(ia->ia_subnetmask != IN_RFC3021_MASK &&
(V_broadcast_lowest && ia->ia_subnetmask != IN_RFC3021_MASK &&
ntohl(in.s_addr) == ia->ia_subnet)) &&
/*
* Check for an all one subnetmask. These