Revert "ipv4: Allow configuring subnets as local addresses"

This reverts commit 4465b469008bc03b98a1b8df4e9ae501b6c69d4b.

Conflicts:

	net/ipv4/fib_frontend.c

As reported by Ben Greear, this causes regressions:

> Change 4465b469008bc03b98a1b8df4e9ae501b6c69d4b 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>

diff --git a/include/net/flow.h b/include/net/flow.h
index 0ac3fb5..bb08692 100644 (file)
--- a/include/net/flow.h
+++ b/include/net/flow.h
@@ -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;

diff --git a/net/core/fib_rules.c b/net/core/fib_rules.c
index 82a4369..a20e5d3 100644 (file)
--- a/net/core/fib_rules.c
+++ b/net/core/fib_rules.c
@@ -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))

diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index eb6f69a..c19c1f7 100644 (file)
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -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;
        }