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--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -1105,6 +1105,18 @@ errout:
rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err);
}
+static inline int accept_ra(struct inet6_dev *in6_dev)
+{
+ /*
+ * If forwarding is enabled, RA are not accepted unless the special
+ * hybrid mode (accept_ra=2) is enabled.
+ */
+ if (in6_dev->cnf.forwarding && in6_dev->cnf.accept_ra < 2)
+ return 0;
+
+ return in6_dev->cnf.accept_ra;
+}
+
static void ndisc_router_discovery(struct sk_buff *skb)
{
struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb);
@@ -1158,8 +1170,7 @@ static void ndisc_router_discovery(struc
return;
}
- /* skip route and link configuration on routers */
- if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_ra)
+ if (!accept_ra(in6_dev))
goto skip_linkparms;
#ifdef CONFIG_IPV6_NDISC_NODETYPE
@@ -1309,8 +1320,7 @@ skip_linkparms:
NEIGH_UPDATE_F_ISROUTER);
}
- /* skip route and link configuration on routers */
- if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_ra)
+ if (!accept_ra(in6_dev))
goto out;
#ifdef CONFIG_IPV6_ROUTE_INFO
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