[PATCH net-next v4 06/10] ipv6: add inet6_rt_del_notify()

[Yuyang Huang <sigefriedhyy@gmail.com>]

Move the body of inet6_rt_notify() to __inet6_rt_notify() and give it
the deletion reason. inet6_rt_notify() keeps its prototype, so the
route addition path does not change.

Add inet6_rt_del_notify() and call it from fib6_del_route().
RTA_DEL_REASON now reaches user space on RTM_DELROUTE for routes the
kernel deleted on its own.

Signed-off-by: Yuyang Huang <sigefriedhyy@gmail.com>
---
 include/net/ip6_fib.h |  2 ++
 net/ipv6/ip6_fib.c    |  2 +-
 net/ipv6/route.c      | 20 ++++++++++++++++----
 3 files changed, 19 insertions(+), 5 deletions(-)

diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h
index c57980671f28..c6dc23a42c11 100644
--- a/include/net/ip6_fib.h
+++ b/include/net/ip6_fib.h
@@ -533,6 +533,8 @@ static inline void fib6_rt_update(struct net *net, struct fib6_info *rt,
 #endif
 void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info,
 		     unsigned int flags);
+void inet6_rt_del_notify(struct fib6_info *rt, struct nl_info *info,
+			 enum rta_del_reason del_reason);
 
 void fib6_age_exceptions(struct fib6_info *rt, struct fib6_gc_args *gc_args,
 			 unsigned long now);
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index d77c61f53155..159db10a846c 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -2056,7 +2056,7 @@ static void fib6_del_route(struct fib6_table *table, struct fib6_node *fn,
 			call_fib6_entry_notifiers_replace(net, replace_rt);
 	}
 	if (!info->skip_notify)
-		inet6_rt_notify(RTM_DELROUTE, rt, info, 0);
+		inet6_rt_del_notify(rt, info, del_reason);
 
 	fib6_info_release(rt);
 }
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index b67c8a31ccd6..304879c6e7e5 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -6376,8 +6376,9 @@ static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
 	return err;
 }
 
-void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info,
-		     unsigned int nlm_flags)
+static void __inet6_rt_notify(int event, struct fib6_info *rt,
+			      struct nl_info *info, unsigned int nlm_flags,
+			      enum rta_del_reason del_reason)
 {
 	struct net *net = info->nl_net;
 	struct sk_buff *skb;
@@ -6396,8 +6397,7 @@ void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info,
 		goto errout;
 
 	err = rt6_fill_node(net, skb, rt, NULL, NULL, NULL, 0,
-			    event, info->portid, seq, nlm_flags,
-			    RTA_DEL_REASON_UNSPEC);
+			    event, info->portid, seq, nlm_flags, del_reason);
 	if (err < 0) {
 		kfree_skb(skb);
 		/* -EMSGSIZE implies needed space grew under us. */
@@ -6418,6 +6418,18 @@ void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info,
 	rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
 }
 
+void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info,
+		     unsigned int nlm_flags)
+{
+	__inet6_rt_notify(event, rt, info, nlm_flags, RTA_DEL_REASON_UNSPEC);
+}
+
+void inet6_rt_del_notify(struct fib6_info *rt, struct nl_info *info,
+			 enum rta_del_reason del_reason)
+{
+	__inet6_rt_notify(RTM_DELROUTE, rt, info, 0, del_reason);
+}
+
 void fib6_rt_update(struct net *net, struct fib6_info *rt,
 		    struct nl_info *info)
 {
-- 
2.43.0