net: l3mdev: Allow send on enslaved interface

[cascardo/linux.git] / net / ipv4 / route.c

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 02c6229..a1f2830 100644 (file)
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -915,11 +915,11 @@ static int ip_error(struct sk_buff *skb)
        if (!IN_DEV_FORWARD(in_dev)) {
                switch (rt->dst.error) {
                case EHOSTUNREACH:
-                       IP_INC_STATS_BH(net, IPSTATS_MIB_INADDRERRORS);
+                       __IP_INC_STATS(net, IPSTATS_MIB_INADDRERRORS);
                        break;
 
                case ENETUNREACH:
-                       IP_INC_STATS_BH(net, IPSTATS_MIB_INNOROUTES);
+                       __IP_INC_STATS(net, IPSTATS_MIB_INNOROUTES);
                        break;
                }
                goto out;
@@ -934,7 +934,7 @@ static int ip_error(struct sk_buff *skb)
                break;
        case ENETUNREACH:
                code = ICMP_NET_UNREACH;
-               IP_INC_STATS_BH(net, IPSTATS_MIB_INNOROUTES);
+               __IP_INC_STATS(net, IPSTATS_MIB_INNOROUTES);
                break;
        case EACCES:
                code = ICMP_PKT_FILTERED;
@@ -1438,9 +1438,9 @@ static void rt_set_nexthop(struct rtable *rt, __be32 daddr,
 #endif
 }
 
-static struct rtable *rt_dst_alloc(struct net_device *dev,
-                                  unsigned int flags, u16 type,
-                                  bool nopolicy, bool noxfrm, bool will_cache)
+struct rtable *rt_dst_alloc(struct net_device *dev,
+                           unsigned int flags, u16 type,
+                           bool nopolicy, bool noxfrm, bool will_cache)
 {
        struct rtable *rt;
 
@@ -1468,6 +1468,7 @@ static struct rtable *rt_dst_alloc(struct net_device *dev,
 
        return rt;
 }
+EXPORT_SYMBOL(rt_dst_alloc);
 
 /* called in rcu_read_lock() section */
 static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr,
@@ -2045,6 +2046,18 @@ static struct rtable *__mkroute_output(const struct fib_result *res,
                 */
                if (fi && res->prefixlen < 4)
                        fi = NULL;
+       } else if ((type == RTN_LOCAL) && (orig_oif != 0) &&
+                  (orig_oif != dev_out->ifindex)) {
+               /* For local routes that require a particular output interface
+                * we do not want to cache the result.  Caching the result
+                * causes incorrect behaviour when there are multiple source
+                * addresses on the interface, the end result being that if the
+                * intended recipient is waiting on that interface for the
+                * packet he won't receive it because it will be delivered on
+                * the loopback interface and the IP_PKTINFO ipi_ifindex will
+                * be set to the loopback interface as well.
+                */
+               fi = NULL;
        }
 
        fnhe = NULL;
@@ -2133,6 +2146,7 @@ struct rtable *__ip_route_output_key_hash(struct net *net, struct flowi4 *fl4,
        unsigned int flags = 0;
        struct fib_result res;
        struct rtable *rth;
+       int master_idx;
        int orig_oif;
        int err = -ENETUNREACH;
 
@@ -2142,6 +2156,9 @@ struct rtable *__ip_route_output_key_hash(struct net *net, struct flowi4 *fl4,
 
        orig_oif = fl4->flowi4_oif;
 
+       master_idx = l3mdev_master_ifindex_by_index(net, fl4->flowi4_oif);
+       if (master_idx)
+               fl4->flowi4_oif = master_idx;
        fl4->flowi4_iif = LOOPBACK_IFINDEX;
        fl4->flowi4_tos = tos & IPTOS_RT_MASK;
        fl4->flowi4_scope = ((tos & RTO_ONLINK) ?