From 93ca3bb5df9bc8b2c60485e1cc6507c3d7c8e1fa Mon Sep 17 00:00:00 2001 From: Timo Teräs <timo.teras@iki.fi> Date: Mon, 28 Mar 2011 22:40:53 +0000 Subject: net: gre: provide multicast mappings for ipv4 and ipv6 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit My commit 6d55cb91a0020ac0 (gre: fix hard header destination address checking) broke multicast. The reason is that ip_gre used to get ipgre_header() calls with zero destination if we have NOARP or multicast destination. Instead the actual target was decided at ipgre_tunnel_xmit() time based on per-protocol dissection. Instead of allowing the "abuse" of ->header() calls with invalid destination, this creates multicast mappings for ip_gre. This also fixes "ip neigh show nud noarp" to display the proper multicast mappings used by the gre device. Reported-by: Doug Kehn <rdkehn@yahoo.com> Signed-off-by: Timo Teräs <timo.teras@iki.fi> Acked-by: Doug Kehn <rdkehn@yahoo.com> Signed-off-by: David S. Miller <davem@davemloft.net> --- include/net/ip.h | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'include/net/ip.h') diff --git a/include/net/ip.h b/include/net/ip.h index a4f631108c54..7c416583b710 100644 --- a/include/net/ip.h +++ b/include/net/ip.h @@ -339,6 +339,14 @@ static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, ch buf[16] = addr & 0x0f; } +static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) +{ + if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0) + memcpy(buf, broadcast, 4); + else + memcpy(buf, &naddr, sizeof(naddr)); +} + #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) #include <linux/ipv6.h> #endif -- cgit v1.2.3