[PATCH net-next 6/7] ipv6: Refactor ip6_route_del for cached routes

[David Ahern]

From: David Ahern <dsah...@gmail.com>

Move the removal of cached routes to a helper, ip6_del_cached_rt, that
can be invoked per nexthop. Rename the existig ip6_del_cached_rt to
__ip6_del_cached_rt since it is called by ip6_del_cached_rt.

Signed-off-by: David Ahern <dsah...@gmail.com>
---
 net/ipv6/route.c | 36 +++++++++++++++++++++---------------
 1 file changed, 21 insertions(+), 15 deletions(-)

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index f248ce807116..fdf598926883 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -3430,7 +3430,7 @@ static int __ip6_del_rt_siblings(struct fib6_info *rt, 
struct fib6_config *cfg)
        return err;
 }
 
-static int ip6_del_cached_rt(struct rt6_info *rt, struct fib6_config *cfg)
+static int __ip6_del_cached_rt(struct rt6_info *rt, struct fib6_config *cfg)
 {
        int rc = -ESRCH;
 
@@ -3446,10 +3446,25 @@ static int ip6_del_cached_rt(struct rt6_info *rt, 
struct fib6_config *cfg)
        return rc;
 }
 
+static int ip6_del_cached_rt(struct fib6_config *cfg, struct fib6_info *rt,
+                            struct fib6_nh *nh)
+{
+       struct fib6_result res = {
+               .f6i = rt,
+               .nh = nh,
+       };
+       struct rt6_info *rt_cache;
+
+       rt_cache = rt6_find_cached_rt(&res, &cfg->fc_dst, &cfg->fc_src);
+       if (rt_cache)
+               return __ip6_del_cached_rt(rt_cache, cfg);
+
+       return 0;
+}
+
 static int ip6_route_del(struct fib6_config *cfg,
                         struct netlink_ext_ack *extack)
 {
-       struct rt6_info *rt_cache;
        struct fib6_table *table;
        struct fib6_info *rt;
        struct fib6_node *fn;
@@ -3474,21 +3489,12 @@ static int ip6_route_del(struct fib6_config *cfg,
 
                        nh = rt->fib6_nh;
                        if (cfg->fc_flags & RTF_CACHE) {
-                               struct fib6_result res = {
-                                       .f6i = rt,
-                                       .nh = nh,
-                               };
                                int rc;
 
-                               rt_cache = rt6_find_cached_rt(&res,
-                                                             &cfg->fc_dst,
-                                                             &cfg->fc_src);
-                               if (rt_cache) {
-                                       rc = ip6_del_cached_rt(rt_cache, cfg);
-                                       if (rc != -ESRCH) {
-                                               rcu_read_unlock();
-                                               return rc;
-                                       }
+                               rc = ip6_del_cached_rt(cfg, rt, nh);
+                               if (rc != -ESRCH) {
+                                       rcu_read_unlock();
+                                       return rc;
                                }
                                continue;
                        }
-- 
2.11.0