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Remove net.link.ether.inet.useloopback sysctl tunable. It was always on by

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default from the very beginning. It was placed in wrong namespace
net.link.ether, originally it had been at another wrong namespace. It was
incorrectly documented at incorrect manual page arp(8). Since new-ARP commit,
the tunable have been consulted only on route addition, and ignored on route
deletion. Behaviour of a system with tunable turned off is not fully correct,
and has no advantages comparing to normal behavior.
This commit is contained in:
Gleb Smirnoff 2013-11-05 07:32:09 +00:00
parent 001eae0836
commit b1b9dcae46
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=257689
5 changed files with 3 additions and 14 deletions
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2
sys/net/if_var.h
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@ -465,13 +465,11 @@ VNET_DECLARE(struct ifnethead, ifnet);
VNET_DECLARE(struct ifgrouphead, ifg_head);
VNET_DECLARE(int, if_index);
VNET_DECLARE(struct ifnet *, loif); /* first loopback interface */
VNET_DECLARE(int, useloopback);
#define V_ifnet VNET(ifnet)
#define V_ifg_head VNET(ifg_head)
#define V_if_index VNET(if_index)
#define V_loif VNET(loif)
#define V_useloopback VNET(useloopback)
int if_addgroup(struct ifnet *, const char *);
int if_delgroup(struct ifnet *, const char *);

5
sys/netinet/if_ether.c
View File

@ -85,8 +85,6 @@ static SYSCTL_NODE(_net_link_ether, PF_ARP, arp, CTLFLAG_RW, 0, "");
static VNET_DEFINE(int, arpt_keep) = (20*60); /* once resolved, good for 20
* minutes */
static VNET_DEFINE(int, arp_maxtries) = 5;
VNET_DEFINE(int, useloopback) = 1; /* use loopback interface for
* local traffic */
static VNET_DEFINE(int, arp_proxyall) = 0;
static VNET_DEFINE(int, arpt_down) = 20; /* keep incomplete entries for
* 20 seconds */
@ -111,9 +109,6 @@ SYSCTL_VNET_INT(_net_link_ether_inet, OID_AUTO, max_age, CTLFLAG_RW,
SYSCTL_VNET_INT(_net_link_ether_inet, OID_AUTO, maxtries, CTLFLAG_RW,
&VNET_NAME(arp_maxtries), 0,
"ARP resolution attempts before returning error");
SYSCTL_VNET_INT(_net_link_ether_inet, OID_AUTO, useloopback, CTLFLAG_RW,
&VNET_NAME(useloopback), 0,
"Use the loopback interface for local traffic");
SYSCTL_VNET_INT(_net_link_ether_inet, OID_AUTO, proxyall, CTLFLAG_RW,
&VNET_NAME(arp_proxyall), 0,
"Enable proxy ARP for all suitable requests");

2
sys/netinet/in.c
View File

@ -856,7 +856,7 @@ in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, struct sockaddr_in *sin,
/*
* add a loopback route to self
*/
if (V_useloopback && !vhid && !(ifp->if_flags & IFF_LOOPBACK)) {
if (!vhid && !(ifp->if_flags & IFF_LOOPBACK)) {
struct route ia_ro;
bzero(&ia_ro, sizeof(ia_ro));

2
sys/netpfil/ipfw/ip_fw2.c
View File

@ -434,7 +434,7 @@ verify_path(struct in_addr src, struct ifnet *ifp, u_int fib)
* If ifp is provided, check for equality with rtentry.
* We should use rt->rt_ifa->ifa_ifp, instead of rt->rt_ifp,
* in order to pass packets injected back by if_simloop():
* if useloopback == 1 routing entry (via lo0) for our own address
* routing entry (via lo0) for our own address
* may exist, so we need to handle routing assymetry.
*/
if (ifp != NULL && ro.ro_rt->rt_ifa->ifa_ifp != ifp) {

6
usr.sbin/arp/arp.4
View File

@ -28,7 +28,7 @@
.\" @(#)arp4.4 6.5 (Berkeley) 4/18/94
.\" $FreeBSD$
.\"
.Dd May 11, 2013
.Dd November 5, 2013
.Dt ARP 4
.Os
.Sh NAME
@ -165,10 +165,6 @@ Default is 5 tries.
.It Va proxyall
Enables ARP proxying for all hosts on net.
Turned off by default.
.It Va useloopback
If an ARP entry is added for local address, force the traffic to go through
the loopback interface.
Turned on by default.
.It Va wait
Lifetime of an incomplete ARP entry.
Default is 20 seconds.