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Revert "ipv4: Allow configuring subnets as local addresses"

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This reverts commit 4465b46900.

Conflicts:

	net/ipv4/fib_frontend.c

As reported by Ben Greear, this causes regressions:

> Change 4465b46900 caused rules
> to stop matching the input device properly because the
> FLOWI_FLAG_MATCH_ANY_IIF is always defined in ip_dev_find().
>
> This breaks rules such as:
>
> ip rule add pref 512 lookup local
> ip rule del pref 0 lookup local
> ip link set eth2 up
> ip -4 addr add 172.16.0.102/24 broadcast 172.16.0.255 dev eth2
> ip rule add to 172.16.0.102 iif eth2 lookup local pref 10
> ip rule add iif eth2 lookup 10001 pref 20
> ip route add 172.16.0.0/24 dev eth2 table 10001
> ip route add unreachable 0/0 table 10001
>
> If you had a second interface 'eth0' that was on a different
> subnet, pinging a system on that interface would fail:
>
>   [root@ct503-60 ~]# ping 192.168.100.1
>   connect: Invalid argument

Reported-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2010-12-23 12:03:57 -08:00
parent 0e214ad815
commit e058464990
3 changed files with 9 additions and 5 deletions
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1
include/net/flow.h
View File

@ -49,7 +49,6 @@ struct flowi {
__u8 proto;
__u8 flags;
#define FLOWI_FLAG_ANYSRC 0x01
#define FLOWI_FLAG_MATCH_ANY_IIF 0x02
union {
struct {
__be16 sport;

3
net/core/fib_rules.c
View File

@ -181,8 +181,7 @@ static int fib_rule_match(struct fib_rule *rule, struct fib_rules_ops *ops,
{
int ret = 0;
if (rule->iifindex && (rule->iifindex != fl->iif) &&
!(fl->flags & FLOWI_FLAG_MATCH_ANY_IIF))
if (rule->iifindex && (rule->iifindex != fl->iif))
goto out;
if (rule->oifindex && (rule->oifindex != fl->oif))

10
net/ipv4/fib_frontend.c
View File

@ -163,13 +163,19 @@ struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
.daddr = addr
}
},
.flags = FLOWI_FLAG_MATCH_ANY_IIF
};
struct fib_result res = { 0 };
struct net_device *dev = NULL;
struct fib_table *local_table;
#ifdef CONFIG_IP_MULTIPLE_TABLES
res.r = NULL;
#endif
rcu_read_lock();
if (fib_lookup(net, &fl, &res)) {
local_table = fib_get_table(net, RT_TABLE_LOCAL);
if (!local_table ||
fib_table_lookup(local_table, &fl, &res, FIB_LOOKUP_NOREF)) {
rcu_read_unlock();
return NULL;
}