[PATCH][RFC/v2][16/21] IPoIB IPv6 support

[Roland Dreier <roland@xxxxxxxxxxx>]

Add ipv6_ib_mc_map() to convert IPv6 multicast addresses to IPoIB
hardware addresses, and add support for autoconfiguration for devices
with type ARPHRD_INFINIBAND.

The mapping for multicast addresses is described in
  http://www.ietf.org/internet-drafts/draft-ietf-ipoib-ip-over-infiniband-07.txt

Signed-off-by: Nitin Hande <Nitin.Hande@xxxxxxx>
Signed-off-by: Roland Dreier <roland@xxxxxxxxxxx>


--- linux-bk.orig/include/net/if_inet6.h        2004-11-23 08:09:55.180272973 
-0800
+++ linux-bk/include/net/if_inet6.h     2004-11-23 08:10:22.300274203 -0800
@@ -266,5 +266,20 @@
 {
        buf[0] = 0x00;
 }
+
+static inline void ipv6_ib_mc_map(struct in6_addr *addr, char *buf)
+{
+       buf[0]  = 0;            /* Reserved */
+       buf[1]  = 0xff;         /* Multicast QPN */
+       buf[2]  = 0xff;
+       buf[3]  = 0xff;
+       buf[4]  = 0xff;
+       buf[5]  = 0x12;         /* link local scope */
+       buf[6]  = 0x60;         /* IPv6 signature */
+       buf[7]  = 0x1b;
+       buf[8]  = 0;            /* P_Key */
+       buf[9]  = 0;
+       memcpy(buf + 10, addr->s6_addr + 6, 10);
+}
 #endif
 #endif
--- linux-bk.orig/net/ipv6/addrconf.c   2004-11-23 08:09:54.776332532 -0800
+++ linux-bk/net/ipv6/addrconf.c        2004-11-23 08:10:22.302273908 -0800
@@ -48,6 +48,7 @@
 #include <linux/netdevice.h>
 #include <linux/if_arp.h>
 #include <linux/if_arcnet.h>
+#include <linux/if_infiniband.h>
 #include <linux/route.h>
 #include <linux/inetdevice.h>
 #include <linux/init.h>
@@ -1098,6 +1099,12 @@
                memset(eui, 0, 7);
                eui[7] = *(u8*)dev->dev_addr;
                return 0;
+       case ARPHRD_INFINIBAND:
+               if (dev->addr_len != INFINIBAND_ALEN)
+                       return -1;
+               memcpy(eui, dev->dev_addr + 12, 8);
+               eui[0] |= 2;
+               return 0;
        }
        return -1;
 }
@@ -1797,6 +1804,7 @@
        if ((dev->type != ARPHRD_ETHER) && 
            (dev->type != ARPHRD_FDDI) &&
            (dev->type != ARPHRD_IEEE802_TR) &&
+           (dev->type != ARPHRD_INFINIBAND) &&
            (dev->type != ARPHRD_ARCNET)) {
                /* Alas, we support only Ethernet autoconfiguration. */
                return;
--- linux-bk.orig/net/ipv6/ndisc.c      2004-11-23 08:09:38.159782567 -0800
+++ linux-bk/net/ipv6/ndisc.c   2004-11-23 08:10:22.302273908 -0800
@@ -260,6 +260,9 @@
        case ARPHRD_ARCNET:
                ipv6_arcnet_mc_map(addr, buf);
                return 0;
+       case ARPHRD_INFINIBAND:
+               ipv6_ib_mc_map(addr, buf);
+               return 0;
        default:
                if (dir) {
                        memcpy(buf, dev->broadcast, dev->addr_len);