ipv4: Add interface option to enable routing of 127.0.0.0/8

Routing of 127/8 is tradtionally forbidden, we consider
packets from that address block martian when routing and do
not process corresponding ARP requests.

This is a sane default but renders a huge address space
practically unuseable.

The RFC states that no address within the 127/8 block should
ever appear on any network anywhere but it does not forbid
the use of such addresses outside of the loopback device in
particular. For example to address a pool of virtual guests
behind a load balancer.

This patch adds a new interface option 'route_localnet'
enabling routing of the 127/8 address block and processing
of ARP requests on a specific interface.

Note that for the feature to work, the default local route
covering 127/8 dev lo needs to be removed.

Example:
  $ sysctl -w net.ipv4.conf.eth0.route_localnet=1
  $ ip route del 127.0.0.0/8 dev lo table local
  $ ip addr add 127.1.0.1/16 dev eth0
  $ ip route flush cache

V2: Fix invalid check to auto flush cache (thanks davem)

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 6f896b9..99d0e05 100644 (file)
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -862,6 +862,11 @@ accept_local - BOOLEAN
        local interfaces over the wire and have them accepted properly.
        default FALSE
 
+route_localnet - BOOLEAN
+       Do not consider loopback addresses as martian source or destination
+       while routing. This enables the use of 127/8 for local routing purposes.
+       default FALSE
+
 rp_filter - INTEGER
        0 - No source validation.
        1 - Strict mode as defined in RFC3704 Strict Reverse Path

diff --git a/include/linux/inetdevice.h b/include/linux/inetdevice.h
index 597f4a9..67f9dda 100644 (file)
--- a/include/linux/inetdevice.h
+++ b/include/linux/inetdevice.h
@@ -38,6 +38,7 @@ enum
        IPV4_DEVCONF_ACCEPT_LOCAL,
        IPV4_DEVCONF_SRC_VMARK,
        IPV4_DEVCONF_PROXY_ARP_PVLAN,
+       IPV4_DEVCONF_ROUTE_LOCALNET,
        __IPV4_DEVCONF_MAX
 };
 
@@ -131,6 +132,7 @@ static inline void ipv4_devconf_setall(struct in_device *in_dev)
 #define IN_DEV_PROMOTE_SECONDARIES(in_dev) \
                                        IN_DEV_ORCONF((in_dev), \
                                                      PROMOTE_SECONDARIES)
+#define IN_DEV_ROUTE_LOCALNET(in_dev)  IN_DEV_ORCONF(in_dev, ROUTE_LOCALNET)
 
 #define IN_DEV_RX_REDIRECTS(in_dev) \
        ((IN_DEV_FORWARD(in_dev) && \

diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
index cda37be..2e560f0 100644 (file)
--- a/net/ipv4/arp.c
+++ b/net/ipv4/arp.c
@@ -790,7 +790,8 @@ static int arp_process(struct sk_buff *skb)
  *     Check for bad requests for 127.x.x.x and requests for multicast
  *     addresses.  If this is one such, delete it.
  */
-       if (ipv4_is_loopback(tip) || ipv4_is_multicast(tip))
+       if (ipv4_is_multicast(tip) ||
+           (!IN_DEV_ROUTE_LOCALNET(in_dev) && ipv4_is_loopback(tip)))
                goto out;
 
 /*

diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index 10e15a1..44bf82e 100644 (file)
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -1500,7 +1500,8 @@ static int devinet_conf_proc(ctl_table *ctl, int write,
 
                if (cnf == net->ipv4.devconf_dflt)
                        devinet_copy_dflt_conf(net, i);
-               if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1)
+               if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 ||
+                   i == IPV4_DEVCONF_ROUTE_LOCALNET - 1)
                        if ((new_value == 0) && (old_value != 0))
                                rt_cache_flush(net, 0);
        }
@@ -1617,6 +1618,8 @@ static struct devinet_sysctl_table {
                                              "force_igmp_version"),
                DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
                                              "promote_secondaries"),
+               DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET,
+                                             "route_localnet"),
        },
 };
 

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 842510d..655506a 100644 (file)
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1960,9 +1960,13 @@ static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr,
                return -EINVAL;
 
        if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) ||
-           ipv4_is_loopback(saddr) || skb->protocol != htons(ETH_P_IP))
+           skb->protocol != htons(ETH_P_IP))
                goto e_inval;
 
+       if (likely(!IN_DEV_ROUTE_LOCALNET(in_dev)))
+               if (ipv4_is_loopback(saddr))
+                       goto e_inval;
+
        if (ipv4_is_zeronet(saddr)) {
                if (!ipv4_is_local_multicast(daddr))
                        goto e_inval;
@@ -2203,8 +2207,7 @@ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
           by fib_lookup.
         */
 
-       if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) ||
-           ipv4_is_loopback(saddr))
+       if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr))
                goto martian_source;
 
        if (ipv4_is_lbcast(daddr) || (saddr == 0 && daddr == 0))
@@ -2216,9 +2219,17 @@ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
        if (ipv4_is_zeronet(saddr))
                goto martian_source;
 
-       if (ipv4_is_zeronet(daddr) || ipv4_is_loopback(daddr))
+       if (ipv4_is_zeronet(daddr))
                goto martian_destination;
 
+       if (likely(!IN_DEV_ROUTE_LOCALNET(in_dev))) {
+               if (ipv4_is_loopback(daddr))
+                       goto martian_destination;
+
+               if (ipv4_is_loopback(saddr))
+                       goto martian_source;
+       }
+
        /*
         *      Now we are ready to route packet.
         */
@@ -2457,9 +2468,14 @@ static struct rtable *__mkroute_output(const struct fib_result *res,
        u16 type = res->type;
        struct rtable *rth;
 
-       if (ipv4_is_loopback(fl4->saddr) && !(dev_out->flags & IFF_LOOPBACK))
+       in_dev = __in_dev_get_rcu(dev_out);
+       if (!in_dev)
                return ERR_PTR(-EINVAL);
 
+       if (likely(!IN_DEV_ROUTE_LOCALNET(in_dev)))
+               if (ipv4_is_loopback(fl4->saddr) && !(dev_out->flags & IFF_LOOPBACK))
+                       return ERR_PTR(-EINVAL);
+
        if (ipv4_is_lbcast(fl4->daddr))
                type = RTN_BROADCAST;
        else if (ipv4_is_multicast(fl4->daddr))
@@ -2470,10 +2486,6 @@ static struct rtable *__mkroute_output(const struct fib_result *res,
        if (dev_out->flags & IFF_LOOPBACK)
                flags |= RTCF_LOCAL;
 
-       in_dev = __in_dev_get_rcu(dev_out);
-       if (!in_dev)
-               return ERR_PTR(-EINVAL);
-
        if (type == RTN_BROADCAST) {
                flags |= RTCF_BROADCAST | RTCF_LOCAL;
                fi = NULL;