[IPV6]: Add RFC4214 support

This patch includes support for the Intra-Site Automatic Tunnel
Addressing Protocol (ISATAP) per RFC4214. It uses the SIT
module, and is configured using extensions to the "iproute2"
utility. The diffs are specific to the Linux 2.6.24-rc2 kernel
distribution.

This version includes the diff for ./include/linux/if.h which was
missing in the v2.4 submission and is needed to make the
patch compile. The patch has been installed, compiled and
tested in a clean 2.6.24-rc2 kernel build area.

Signed-off-by: Fred L. Templin <fred.l.templin@boeing.com>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 21 insertions, 1 deletions

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 6c8b193474ba..f177424c186f 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -377,6 +377,13 @@ static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
                        "%s: Disabled Privacy Extensions\n",
                        dev->name);
                 ndev->cnf.use_tempaddr = -1;
+
+                if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
+                        printk(KERN_INFO
+                               "%s: Disabled Multicast RS\n",
+                               dev->name);
+                        ndev->cnf.rtr_solicits = 0;
+                }
         } else {
                 in6_dev_hold(ndev);
                 ipv6_regen_rndid((unsigned long) ndev);
@@ -1409,6 +1416,9 @@ static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
                 return addrconf_ifid_arcnet(eui, dev);
         case ARPHRD_INFINIBAND:
                 return addrconf_ifid_infiniband(eui, dev);
+        case ARPHRD_SIT:
+                if (dev->priv_flags & IFF_ISATAP)
+                        return ipv6_isatap_eui64(eui, *(__be32 *)dev->dev_addr);
         }
         return -1;
 }
@@ -1444,7 +1454,7 @@ regen:
          *
          *  - Reserved subnet anycast (RFC 2526)
          *      11111101 11....11 1xxxxxxx
-         *  - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
+         *  - ISATAP (RFC4214) 6.1
          *      00-00-5E-FE-xx-xx-xx-xx
          *  - value 0
          *  - XXX: already assigned to an address on the device
@@ -2175,6 +2185,16 @@ static void addrconf_sit_config(struct net_device *dev)
                 return;
         }
 
+        if (dev->priv_flags & IFF_ISATAP) {
+                struct in6_addr addr;
+
+                ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
+                addrconf_prefix_route(&addr, 64, dev, 0, 0);
+                if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
+                        addrconf_add_linklocal(idev, &addr);
+                return;
+        }
+
         sit_add_v4_addrs(idev);
 
         if (dev->flags&IFF_POINTOPOINT) {