[PATCH net-next v5 02/10] ipv6: propagate the route deletion reason to fib6_del_route()

[Yuyang Huang <sigefriedhyy@gmail.com>]

Pass the deletion reason from ip6_del_rt_reason() down through
__ip6_del_rt(), fib6_del() and into fib6_del_route(). All existing
callers pass RT_DEL_REASON_UNSPEC.

fib6_del_route() ignores the reason until the notification path learns
to report it.

Signed-off-by: Yuyang Huang <sigefriedhyy@gmail.com>
---
 include/net/ip6_fib.h |  3 ++-
 net/ipv6/ip6_fib.c    | 12 +++++++-----
 net/ipv6/route.c      | 19 +++++++++++--------
 3 files changed, 20 insertions(+), 14 deletions(-)

diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h
index 9cd27e1b9b69..0ba5d3c56543 100644
--- a/include/net/ip6_fib.h
+++ b/include/net/ip6_fib.h
@@ -468,7 +468,8 @@ void fib6_clean_all_skip_notify(struct net *net,
 
 int fib6_add(struct fib6_node *root, struct fib6_info *rt,
 	     struct nl_info *info, struct netlink_ext_ack *extack);
-int fib6_del(struct fib6_info *rt, struct nl_info *info);
+int fib6_del(struct fib6_info *rt, struct nl_info *info,
+	     enum rt_del_reason del_reason);
 
 static inline
 void rt6_get_prefsrc(const struct rt6_info *rt, struct in6_addr *addr)
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index e9fc692d4f3b..1f6f6f33ded1 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -1967,7 +1967,8 @@ static struct fib6_node *fib6_repair_tree(struct net *net,
 }
 
 static void fib6_del_route(struct fib6_table *table, struct fib6_node *fn,
-			   struct fib6_info __rcu **rtp, struct nl_info *info)
+			   struct fib6_info __rcu **rtp, struct nl_info *info,
+			   enum rt_del_reason del_reason)
 {
 	struct fib6_info *leaf, *replace_rt = NULL;
 	struct fib6_walker *w;
@@ -2062,7 +2063,8 @@ static void fib6_del_route(struct fib6_table *table, struct fib6_node *fn,
 }
 
 /* Need to own table->tb6_lock */
-int fib6_del(struct fib6_info *rt, struct nl_info *info)
+int fib6_del(struct fib6_info *rt, struct nl_info *info,
+	     enum rt_del_reason del_reason)
 {
 	struct net *net = info->nl_net;
 	struct fib6_info __rcu **rtp;
@@ -2091,7 +2093,7 @@ int fib6_del(struct fib6_info *rt, struct nl_info *info)
 		if (rt == cur) {
 			if (fib6_requires_src(cur))
 				fib6_routes_require_src_dec(info->nl_net);
-			fib6_del_route(table, fn, rtp, info);
+			fib6_del_route(table, fn, rtp, info, del_reason);
 			return 0;
 		}
 		rtp_next = &cur->fib6_next;
@@ -2253,7 +2255,7 @@ static int fib6_clean_node(struct fib6_walker *w)
 		res = c->func(rt, c->arg);
 		if (res == -1) {
 			w->leaf = rt;
-			res = fib6_del(rt, &info);
+			res = fib6_del(rt, &info, RT_DEL_REASON_UNSPEC);
 			if (res) {
 #if RT6_DEBUG >= 2
 				pr_debug("%s: del failed: rt=%p@%p err=%d\n",
@@ -2401,7 +2403,7 @@ static void fib6_gc_table(struct net *net,
 
 	hlist_for_each_entry_safe(rt, n, &tb6->tb6_gc_hlist, gc_link)
 		if (fib6_age(rt, gc_args) == -1)
-			fib6_del(rt, &info);
+			fib6_del(rt, &info, RT_DEL_REASON_UNSPEC);
 }
 
 static void fib6_gc_all(struct net *net, struct fib6_gc_args *gc_args)
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index ca374b056f5a..252f1825a199 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -3973,7 +3973,8 @@ int ip6_route_add(struct fib6_config *cfg, gfp_t gfp_flags,
 	return err;
 }
 
-static int __ip6_del_rt(struct fib6_info *rt, struct nl_info *info)
+static int __ip6_del_rt(struct fib6_info *rt, struct nl_info *info,
+			enum rt_del_reason del_reason)
 {
 	struct net *net = info->nl_net;
 	struct fib6_table *table;
@@ -3986,7 +3987,7 @@ static int __ip6_del_rt(struct fib6_info *rt, struct nl_info *info)
 
 	table = rt->fib6_table;
 	spin_lock_bh(&table->tb6_lock);
-	err = fib6_del(rt, info);
+	err = fib6_del(rt, info, del_reason);
 	spin_unlock_bh(&table->tb6_lock);
 
 out:
@@ -4001,7 +4002,7 @@ int ip6_del_rt(struct net *net, struct fib6_info *rt, bool skip_notify)
 		.skip_notify = skip_notify
 	};
 
-	return __ip6_del_rt(rt, &info);
+	return __ip6_del_rt(rt, &info, RT_DEL_REASON_UNSPEC);
 }
 
 int ip6_del_rt_reason(struct net *net, struct fib6_info *rt,
@@ -4009,7 +4010,7 @@ int ip6_del_rt_reason(struct net *net, struct fib6_info *rt,
 {
 	struct nl_info info = { .nl_net = net };
 
-	return __ip6_del_rt(rt, &info);
+	return __ip6_del_rt(rt, &info, del_reason);
 }
 
 static int __ip6_del_rt_siblings(struct fib6_info *rt, struct fib6_config *cfg)
@@ -4072,13 +4073,13 @@ static int __ip6_del_rt_siblings(struct fib6_info *rt, struct fib6_config *cfg)
 		list_for_each_entry_safe(sibling, next_sibling,
 					 &rt->fib6_siblings,
 					 fib6_siblings) {
-			err = fib6_del(sibling, info);
+			err = fib6_del(sibling, info, RT_DEL_REASON_UNSPEC);
 			if (err)
 				goto out_unlock;
 		}
 	}
 
-	err = fib6_del(rt, info);
+	err = fib6_del(rt, info, RT_DEL_REASON_UNSPEC);
 out_unlock:
 	spin_unlock_bh(&table->tb6_lock);
 out_put:
@@ -4204,7 +4205,8 @@ static int ip6_route_del(struct fib6_config *cfg,
 				if (!fib6_info_hold_safe(rt))
 					continue;
 
-				err =  __ip6_del_rt(rt, &cfg->fc_nlinfo);
+				err = __ip6_del_rt(rt, &cfg->fc_nlinfo,
+						   RT_DEL_REASON_UNSPEC);
 				break;
 			}
 			if (cfg->fc_nh_id)
@@ -4223,7 +4225,8 @@ static int ip6_route_del(struct fib6_config *cfg,
 
 			/* if gateway was specified only delete the one hop */
 			if (cfg->fc_flags & RTF_GATEWAY)
-				err = __ip6_del_rt(rt, &cfg->fc_nlinfo);
+				err = __ip6_del_rt(rt, &cfg->fc_nlinfo,
+						   RT_DEL_REASON_UNSPEC);
 			else
 				err = __ip6_del_rt_siblings(rt, cfg);
 			break;
-- 
2.43.0