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net: Loopback ifindex is constant now

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As pointed out, there are places, that access net->loopback_dev->ifindex
and after ifindex generation is made per-net this value becomes constant
equals 1. So go ahead and introduce the LOOPBACK_IFINDEX constant and use
it where appropriate.

Change-Id: I29fd08fa01a9522240ab654d436b02a577bb610c
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Kevin F. Haggerty <haggertk@lineageos.org>
This commit is contained in:
Pavel Emelyanov 2012-08-08 21:53:36 +00:00 committed by Francescodario Cuzzocrea
parent 0a869bcb58
commit dfa1494b31
4 changed files with 8 additions and 7 deletions
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1
drivers/net/loopback.c
View file

@ -202,6 +202,7 @@ static __net_init int loopback_net_init(struct net *net)
if (err)
goto out_free_netdev;
BUG_ON(dev->ifindex != LOOPBACK_IFINDEX);
net->loopback_dev = dev;
return 0;

6
net/decnet/dn_route.c
View file

@ -928,7 +928,7 @@ static int dn_route_output_slow(struct dst_entry **pprt, const struct flowidn *o
.saddr = oldflp->saddr,
.flowidn_scope = RT_SCOPE_UNIVERSE,
.flowidn_mark = oldflp->flowidn_mark,
.flowidn_iif = init_net.loopback_dev->ifindex,
.flowidn_iif = LOOPBACK_IFINDEX,
.flowidn_oif = oldflp->flowidn_oif,
};
struct dn_route *rt = NULL;
@ -946,7 +946,7 @@ static int dn_route_output_slow(struct dst_entry **pprt, const struct flowidn *o
"dn_route_output_slow: dst=%04x src=%04x mark=%d"
" iif=%d oif=%d\n", le16_to_cpu(oldflp->daddr),
le16_to_cpu(oldflp->saddr),
oldflp->flowidn_mark, init_net.loopback_dev->ifindex,
oldflp->flowidn_mark, LOOPBACK_IFINDEX,
oldflp->flowidn_oif);
/* If we have an output interface, verify its a DECnet device */
@ -1009,7 +1009,7 @@ source_ok:
if (!fld.daddr)
goto out;
}
fld.flowidn_oif = init_net.loopback_dev->ifindex;
fld.flowidn_oif = LOOPBACK_IFINDEX;
res.type = RTN_LOCAL;
goto make_route;
}

2
net/ipv4/netfilter/ipt_rpfilter.c
View file

@ -90,7 +90,7 @@ static bool rpfilter_mt(const struct sk_buff *skb, struct xt_action_param *par)
if (ipv4_is_zeronet(iph->saddr))
return ipv4_is_local_multicast(iph->daddr) ^ invert;
}
flow.flowi4_iif = dev_net(par->in)->loopback_dev->ifindex;
flow.flowi4_iif = LOOPBACK_IFINDEX;
flow.daddr = iph->saddr;
flow.saddr = rpfilter_get_saddr(iph->daddr);
flow.flowi4_oif = 0;

6
net/ipv4/route.c
View file

@ -2347,7 +2347,7 @@ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
if (res.type == RTN_LOCAL) {
err = fib_validate_source(skb, saddr, daddr, tos,
net->loopback_dev->ifindex,
LOOPBACK_IFINDEX,
dev, &spec_dst, &itag);
if (err < 0)
goto martian_source_keep_err;
@ -2674,7 +2674,7 @@ static struct rtable *ip_route_output_slow(struct net *net, struct flowi4 *fl4)
orig_saddr = fl4->saddr;
orig_oif = fl4->flowi4_oif;
fl4->flowi4_iif = net->loopback_dev->ifindex;
fl4->flowi4_iif = LOOPBACK_IFINDEX;
fl4->flowi4_tos = tos & IPTOS_RT_MASK;
fl4->flowi4_scope = ((tos & RTO_ONLINK) ?
RT_SCOPE_LINK : RT_SCOPE_UNIVERSE);
@ -2763,7 +2763,7 @@ static struct rtable *ip_route_output_slow(struct net *net, struct flowi4 *fl4)
if (!fl4->daddr)
fl4->daddr = fl4->saddr = htonl(INADDR_LOOPBACK);
dev_out = net->loopback_dev;
fl4->flowi4_oif = net->loopback_dev->ifindex;
fl4->flowi4_oif = LOOPBACK_IFINDEX;
res.type = RTN_LOCAL;
flags |= RTCF_LOCAL;
goto make_route;