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authorTimo Teräs <timo.teras@iki.fi>2011-03-28 18:40:53 -0400
committerDavid S. Miller <davem@davemloft.net>2011-03-30 03:10:47 -0400
commit93ca3bb5df9bc8b2c60485e1cc6507c3d7c8e1fa (patch)
tree6ccf21f8d1e4431c6be79c265fb1f9a722308f63 /net/ipv4/arp.c
parent1459a3cc51d90d78027c7b5c1790e5d22751c8eb (diff)
net: gre: provide multicast mappings for ipv4 and ipv6
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>
Diffstat (limited to 'net/ipv4/arp.c')
-rw-r--r--net/ipv4/arp.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
index 090d273d7865..1b74d3b64371 100644
--- a/net/ipv4/arp.c
+++ b/net/ipv4/arp.c
@@ -215,6 +215,9 @@ int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir)
215 case ARPHRD_INFINIBAND: 215 case ARPHRD_INFINIBAND:
216 ip_ib_mc_map(addr, dev->broadcast, haddr); 216 ip_ib_mc_map(addr, dev->broadcast, haddr);
217 return 0; 217 return 0;
218 case ARPHRD_IPGRE:
219 ip_ipgre_mc_map(addr, dev->broadcast, haddr);
220 return 0;
218 default: 221 default:
219 if (dir) { 222 if (dir) {
220 memcpy(haddr, dev->broadcast, dev->addr_len); 223 memcpy(haddr, dev->broadcast, dev->addr_len);