[PATCH net-next v5 04/11] ipv6: Combine rt6_alloc_cow and rt6_alloc_clone

[Martin KaFai Lau]

A prep work for creating RTF_CACHE on exception only.  After this
patch, the same condition (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY))
is checked twice. This redundancy will be removed in the later patch.

Signed-off-by: Martin KaFai Lau <ka...@fb.com>
Cc: Hannes Frederic Sowa <han...@stressinduktion.org>
Cc: Steffen Klassert <steffen.klass...@secunet.com>
Cc: Julian Anastasov <j...@ssi.bg>
---
 net/ipv6/route.c | 45 ++++++++++++++++++++-------------------------
 1 file changed, 20 insertions(+), 25 deletions(-)

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 34180f1..575d112 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -655,6 +655,11 @@ static struct rt6_info *rt6_select(struct fib6_node *fn, 
int oif, int strict)
        return match ? match : net->ipv6.ip6_null_entry;
 }
 
+static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt)
+{
+       return (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY));
+}
+
 #ifdef CONFIG_IPV6_ROUTE_INFO
 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
                  const struct in6_addr *gwaddr)
@@ -833,9 +838,9 @@ int ip6_ins_rt(struct rt6_info *rt)
        return __ip6_ins_rt(rt, &info, &mxc);
 }
 
-static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort,
-                                     const struct in6_addr *daddr,
-                                     const struct in6_addr *saddr)
+static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort,
+                                          const struct in6_addr *daddr,
+                                          const struct in6_addr *saddr)
 {
        struct rt6_info *rt;
 
@@ -846,33 +851,24 @@ static struct rt6_info *rt6_alloc_cow(struct rt6_info 
*ort,
        rt = ip6_rt_copy(ort, daddr);
 
        if (rt) {
-               if (ort->rt6i_dst.plen != 128 &&
-                   ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
-                       rt->rt6i_flags |= RTF_ANYCAST;
-
                rt->rt6i_flags |= RTF_CACHE;
 
+               if (!rt6_is_gw_or_nonexthop(ort)) {
+                       if (ort->rt6i_dst.plen != 128 &&
+                           ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
+                               rt->rt6i_flags |= RTF_ANYCAST;
 #ifdef CONFIG_IPV6_SUBTREES
-               if (rt->rt6i_src.plen && saddr) {
-                       rt->rt6i_src.addr = *saddr;
-                       rt->rt6i_src.plen = 128;
-               }
+                       if (rt->rt6i_src.plen && saddr) {
+                               rt->rt6i_src.addr = *saddr;
+                               rt->rt6i_src.plen = 128;
+                       }
 #endif
+               }
        }
 
        return rt;
 }
 
-static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort,
-                                       const struct in6_addr *daddr)
-{
-       struct rt6_info *rt = ip6_rt_copy(ort, daddr);
-
-       if (rt)
-               rt->rt6i_flags |= RTF_CACHE;
-       return rt;
-}
-
 static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table 
*table, int oif,
                                      struct flowi6 *fl6, int flags)
 {
@@ -918,10 +914,9 @@ redo_rt6_select:
        if (rt->rt6i_flags & RTF_CACHE)
                goto out2;
 
-       if (!(rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY)))
-               nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr);
-       else if (!(rt->dst.flags & DST_HOST) || !(rt->rt6i_flags & RTF_LOCAL))
-               nrt = rt6_alloc_clone(rt, &fl6->daddr);
+       if (!rt6_is_gw_or_nonexthop(rt) ||
+           !(rt->dst.flags & DST_HOST) || !(rt->rt6i_flags & RTF_LOCAL))
+               nrt = ip6_rt_cache_alloc(rt, &fl6->daddr, &fl6->saddr);
        else
                goto out2;
 
-- 
1.8.1

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