ipv6: enforce flowi6_oif usage in ip6_dst_lookup_tail()

[ Upstream commit 6f21c96a78b835259546d8f3fb4edff0f651d478 ]

The current implementation of ip6_dst_lookup_tail basically
ignore the egress ifindex match: if the saddr is set,
ip6_route_output() purposefully ignores flowi6_oif, due
to the commit d46a9d678e4c ("net: ipv6: Dont add RT6_LOOKUP_F_IFACE
flag if saddr set"), if the saddr is 'any' the first route lookup
in ip6_dst_lookup_tail fails, but upon failure a second lookup will
be performed with saddr set, thus ignoring the ifindex constraint.

This commit adds an output route lookup function variant, which
allows the caller to specify lookup flags, and modify
ip6_dst_lookup_tail() to enforce the ifindex match on the second
lookup via said helper.

ip6_route_output() becames now a static inline function build on
top of ip6_route_output_flags(); as a side effect, out-of-tree
modules need now a GPL license to access the output route lookup
functionality.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Acked-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h
index 877f682989b892fb1d70256bda6b33f03e34a0f5..295d291269e2c88ed4930041597a28f7c9a7a2f7 100644 (file)
--- a/include/net/ip6_route.h
+++ b/include/net/ip6_route.h
@@ -64,8 +64,16 @@ static inline bool rt6_need_strict(const struct in6_addr *daddr)
 
 void ip6_route_input(struct sk_buff *skb);
 
-struct dst_entry *ip6_route_output(struct net *net, const struct sock *sk,
-                                  struct flowi6 *fl6);
+struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
+                                        struct flowi6 *fl6, int flags);
+
+static inline struct dst_entry *ip6_route_output(struct net *net,
+                                                const struct sock *sk,
+                                                struct flowi6 *fl6)
+{
+       return ip6_route_output_flags(net, sk, fl6, 0);
+}
+
 struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
                                   int flags);
 

diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 6473889f1736f2e6b6dadc9a44367d17f4dc0b23..31144c486c521d98fca1e9099eb9801ae3e31854 100644 (file)
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -909,6 +909,7 @@ static int ip6_dst_lookup_tail(struct net *net, const struct sock *sk,
        struct rt6_info *rt;
 #endif
        int err;
+       int flags = 0;
 
        /* The correct way to handle this would be to do
         * ip6_route_get_saddr, and then ip6_route_output; however,
@@ -940,10 +941,13 @@ static int ip6_dst_lookup_tail(struct net *net, const struct sock *sk,
                        dst_release(*dst);
                        *dst = NULL;
                }
+
+               if (fl6->flowi6_oif)
+                       flags |= RT6_LOOKUP_F_IFACE;
        }
 
        if (!*dst)
-               *dst = ip6_route_output(net, sk, fl6);
+               *dst = ip6_route_output_flags(net, sk, fl6, flags);
 
        err = (*dst)->error;
        if (err)

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 826e6aa44f8d42c9c2e815ee134a4f58f1f29c80..3f164d3aaee2eaa7aa246d6c100ef405fd3016e0 100644 (file)
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1174,11 +1174,10 @@ static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table
        return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
 }
 
-struct dst_entry *ip6_route_output(struct net *net, const struct sock *sk,
-                                   struct flowi6 *fl6)
+struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
+                                        struct flowi6 *fl6, int flags)
 {
        struct dst_entry *dst;
-       int flags = 0;
        bool any_src;
 
        dst = l3mdev_rt6_dst_by_oif(net, fl6);
@@ -1199,7 +1198,7 @@ struct dst_entry *ip6_route_output(struct net *net, const struct sock *sk,
 
        return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
 }
-EXPORT_SYMBOL(ip6_route_output);
+EXPORT_SYMBOL_GPL(ip6_route_output_flags);
 
 struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
 {