[PATCH net-next v6 04/10] ipv6: add a deletion reason argument to rt6_fill_node()

[Yuyang Huang <sigefriedhyy@gmail.com>]

Add the deletion reason to rt6_fill_node() so that it can report it to
user space. All callers pass RT_DEL_REASON_UNSPEC for now.

Signed-off-by: Yuyang Huang <sigefriedhyy@gmail.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
---
 net/ipv6/route.c | 27 +++++++++++++++++----------
 1 file changed, 17 insertions(+), 10 deletions(-)

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index bb14d7f7bad4..6732e95bf7b3 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -111,7 +111,7 @@ static int rt6_fill_node(struct net *net, struct sk_buff *skb,
 			 struct fib6_info *rt, struct dst_entry *dst,
 			 struct in6_addr *dest, struct in6_addr *src,
 			 int iif, int type, u32 portid, u32 seq,
-			 unsigned int flags);
+			 unsigned int flags, enum rt_del_reason del_reason);
 static struct rt6_info *rt6_find_cached_rt(const struct fib6_result *res,
 					   const struct in6_addr *daddr,
 					   const struct in6_addr *saddr);
@@ -4037,7 +4037,8 @@ static int __ip6_del_rt_siblings(struct fib6_info *rt, struct fib6_config *cfg)
 
 			if (rt6_fill_node(net, skb, rt, NULL,
 					  NULL, NULL, 0, RTM_DELROUTE,
-					  info->portid, seq, 0) < 0) {
+					  info->portid, seq, 0,
+					  RT_DEL_REASON_UNSPEC) < 0) {
 				kfree_skb(skb);
 				skb = NULL;
 			} else
@@ -5786,7 +5787,7 @@ static int rt6_fill_node(struct net *net, struct sk_buff *skb,
 			 struct fib6_info *rt, struct dst_entry *dst,
 			 struct in6_addr *dest, struct in6_addr *src,
 			 int iif, int type, u32 portid, u32 seq,
-			 unsigned int flags)
+			 unsigned int flags, enum rt_del_reason del_reason)
 {
 	struct rt6_info *rt6 = dst_rt6_info(dst);
 	struct rt6key *rt6_dst, *rt6_src;
@@ -6066,7 +6067,8 @@ static int rt6_nh_dump_exceptions(struct fib6_nh *nh, void *arg)
 					    &rt6_ex->rt6i->dst, NULL, NULL, 0,
 					    RTM_NEWROUTE,
 					    NETLINK_CB(dump->cb->skb).portid,
-					    dump->cb->nlh->nlmsg_seq, w->flags);
+					    dump->cb->nlh->nlmsg_seq, w->flags,
+					    RT_DEL_REASON_UNSPEC);
 			if (err)
 				return err;
 
@@ -6114,7 +6116,8 @@ int rt6_dump_route(struct fib6_info *rt, void *p_arg, unsigned int skip)
 			if (rt6_fill_node(net, arg->skb, rt, NULL, NULL, NULL,
 					  0, RTM_NEWROUTE,
 					  NETLINK_CB(arg->cb->skb).portid,
-					  arg->cb->nlh->nlmsg_seq, flags)) {
+					  arg->cb->nlh->nlmsg_seq, flags,
+					  RT_DEL_REASON_UNSPEC)) {
 				return 0;
 			}
 			count++;
@@ -6347,12 +6350,14 @@ static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
 			err = rt6_fill_node(net, skb, from, NULL, NULL, NULL,
 					    iif, RTM_NEWROUTE,
 					    NETLINK_CB(in_skb).portid,
-					    nlh->nlmsg_seq, 0);
+					    nlh->nlmsg_seq, 0,
+					    RT_DEL_REASON_UNSPEC);
 		else
 			err = rt6_fill_node(net, skb, from, dst, &fl6.daddr,
 					    &fl6.saddr, iif, RTM_NEWROUTE,
 					    NETLINK_CB(in_skb).portid,
-					    nlh->nlmsg_seq, 0);
+					    nlh->nlmsg_seq, 0,
+					    RT_DEL_REASON_UNSPEC);
 	} else {
 		err = -ENETUNREACH;
 	}
@@ -6388,7 +6393,8 @@ 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);
+			    event, info->portid, seq, nlm_flags,
+			    RT_DEL_REASON_UNSPEC);
 	if (err < 0) {
 		kfree_skb(skb);
 		/* -EMSGSIZE implies needed space grew under us. */
@@ -6421,7 +6427,8 @@ void fib6_rt_update(struct net *net, struct fib6_info *rt,
 		goto errout;
 
 	err = rt6_fill_node(net, skb, rt, NULL, NULL, NULL, 0,
-			    RTM_NEWROUTE, info->portid, seq, NLM_F_REPLACE);
+			    RTM_NEWROUTE, info->portid, seq, NLM_F_REPLACE,
+			    RT_DEL_REASON_UNSPEC);
 	if (err < 0) {
 		/* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
 		WARN_ON(err == -EMSGSIZE);
@@ -6474,7 +6481,7 @@ void fib6_info_hw_flags_set(struct net *net, struct fib6_info *f6i,
 	}
 
 	err = rt6_fill_node(net, skb, f6i, NULL, NULL, NULL, 0, RTM_NEWROUTE, 0,
-			    0, 0);
+			    0, 0, RT_DEL_REASON_UNSPEC);
 	if (err < 0) {
 		/* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
 		WARN_ON(err == -EMSGSIZE);
-- 
2.43.0