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-rw-r--r--net/ipv6/icmp.c21
1 files changed, 20 insertions, 1 deletions
diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c
index 2688f3e82165..fc5000370030 100644
--- a/net/ipv6/icmp.c
+++ b/net/ipv6/icmp.c
@@ -229,6 +229,25 @@ static bool icmpv6_xrlim_allow(struct sock *sk, u8 type,
return res;
}
+static bool icmpv6_rt_has_prefsrc(struct sock *sk, u8 type,
+ struct flowi6 *fl6)
+{
+ struct net *net = sock_net(sk);
+ struct dst_entry *dst;
+ bool res = false;
+
+ dst = ip6_route_output(net, sk, fl6);
+ if (!dst->error) {
+ struct rt6_info *rt = (struct rt6_info *)dst;
+ struct in6_addr prefsrc;
+
+ rt6_get_prefsrc(rt, &prefsrc);
+ res = !ipv6_addr_any(&prefsrc);
+ }
+ dst_release(dst);
+ return res;
+}
+
/*
* an inline helper for the "simple" if statement below
* checks if parameter problem report is caused by an
@@ -527,7 +546,7 @@ static void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info,
saddr = force_saddr;
if (saddr) {
fl6.saddr = *saddr;
- } else {
+ } else if (!icmpv6_rt_has_prefsrc(sk, type, &fl6)) {
/* select a more meaningful saddr from input if */
struct net_device *in_netdev;