target/linux/generic/patches-2.6.31/300-ipv6_accept_ra_when_forwarding.patch

   1 --- a/net/ipv6/ndisc.c
   2 +++ b/net/ipv6/ndisc.c
   3 @@ -1106,6 +1106,18 @@ errout:
   4         rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err);
   5  }
   6
   7 +static inline int accept_ra(struct inet6_dev *in6_dev)
   8 +{
   9 +       /*
  10 +        * If forwarding is enabled, RA are not accepted unless the special
  11 +        * hybrid mode (accept_ra=2) is enabled.
  12 +        */
  13 +       if (in6_dev->cnf.forwarding && in6_dev->cnf.accept_ra < 2)
  14 +               return 0;
  15 +
  16 +       return in6_dev->cnf.accept_ra;
  17 +}
  18 +
  19  static void ndisc_router_discovery(struct sk_buff *skb)
  20  {
  21         struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb);
  22 @@ -1151,7 +1163,7 @@ static void ndisc_router_discovery(struc
  23                            skb->dev->name);
  24                 return;
  25         }
  26 -       if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_ra) {
  27 +       if (!accept_ra(in6_dev)) {
  28                 in6_dev_put(in6_dev);
  29                 return;
  30         }