From: Fred L. Templin <[EMAIL PROTECTED]>
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 reflects changes based on netdev list discussions
on 11/14/07 thru 11/15/07. It does away with in-the-kernel RS/RA
pinging and now asks that the task be performed by an application.
The application will essentially entail a port of the FreeBSD 'rtsold'
daemon, and will use the standard socket API.
Signed-off-by: Fred L. Templin <[EMAIL PROTECTED]>
---
--- linux-2.6.24-rc2/include/linux/if_tunnel.h.orig 2007-11-19
03:54:12.000000000 -0800
+++ linux-2.6.24-rc2/include/linux/if_tunnel.h 2007-11-19 03:55:58.000000000
-0800
@@ -17,6 +17,9 @@
#define GRE_FLAGS __constant_htons(0x00F8)
#define GRE_VERSION __constant_htons(0x0007)
+/* i_flags values for SIT mode */
+#define SIT_ISATAP 0x0001
+
struct ip_tunnel_parm
{
char name[IFNAMSIZ];
--- linux-2.6.24-rc2/include/linux/in.h.orig 2007-11-09 08:00:32.000000000
-0800
+++ linux-2.6.24-rc2/include/linux/in.h 2007-11-12 07:37:05.000000000 -0800
@@ -253,6 +253,14 @@ struct sockaddr_in {
#define ZERONET(x) (((x) & htonl(0xff000000)) == htonl(0x00000000))
#define LOCAL_MCAST(x) (((x) & htonl(0xFFFFFF00)) == htonl(0xE0000000))
+/* Special-Use IPv4 Addresses (RFC3330) */
+#define PRIVATE_10(x) (((x) & htonl(0xff000000)) == htonl(0x0A000000))
+#define LINKLOCAL_169(x) (((x) & htonl(0xffff0000)) == htonl(0xA9FE0000))
+#define PRIVATE_172(x) (((x) & htonl(0xfff00000)) == htonl(0xAC100000))
+#define TEST_192(x) (((x) & htonl(0xffffff00)) == htonl(0xC0000200))
+#define ANYCAST_6TO4(x) (((x) & htonl(0xffffff00)) == htonl(0xC0586300))
+#define PRIVATE_192(x) (((x) & htonl(0xffff0000)) == htonl(0xC0A80000))
+#define TEST_198(x) (((x) & htonl(0xfffe0000)) == htonl(0xC6120000))
#endif
#endif /* _LINUX_IN_H */
--- linux-2.6.24-rc2/include/net/addrconf.h.orig 2007-11-08
12:06:17.000000000 -0800
+++ linux-2.6.24-rc2/include/net/addrconf.h 2007-11-19 05:47:48.000000000
-0800
@@ -17,6 +17,7 @@
#define IPV6_MAX_ADDRESSES 16
+#include <linux/in.h>
#include <linux/in6.h>
struct prefix_info {
@@ -241,6 +242,24 @@ static inline int ipv6_addr_is_ll_all_ro
addr->s6_addr32[3] == htonl(0x00000002));
}
+static inline int ipv6_isatap_eui64(u8 *eui, __be32 addr)
+{
+ eui[0] = (ZERONET(addr) || PRIVATE_10(addr) || LOOPBACK(addr) ||
+ LINKLOCAL_169(addr) || PRIVATE_172(addr) || TEST_192(addr) ||
+ ANYCAST_6TO4(addr) || PRIVATE_192(addr) || TEST_198(addr) ||
+ MULTICAST(addr) || BADCLASS(addr)) ? 0x00 : 0x02;
+ eui[1] = 0;
+ eui[2] = 0x5E;
+ eui[3] = 0xFE;
+ memcpy (eui+4, &addr, 4);
+ return 0;
+}
+
+static inline int ipv6_addr_is_isatap(const struct in6_addr *addr)
+{
+ return ((addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE));
+}
+
#ifdef CONFIG_PROC_FS
extern int if6_proc_init(void);
extern void if6_proc_exit(void);
--- linux-2.6.24-rc2/net/ipv6/addrconf.c.orig 2007-11-19 03:43:06.000000000
-0800
+++ linux-2.6.24-rc2/net/ipv6/addrconf.c 2007-11-19 13:29:36.000000000
-0800
@@ -379,6 +379,13 @@ static struct inet6_dev * ipv6_add_dev(s
"%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);
@@ -1435,6 +1442,9 @@ static int ipv6_generate_eui64(u8 *eui,
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;
}
@@ -1470,7 +1480,7 @@ 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
@@ -2201,6 +2211,16 @@ static void addrconf_sit_config(struct n
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) {
--- linux-2.6.24-rc2/net/ipv6/route.c.orig 2007-11-19 15:26:30.000000000
-0800
+++ linux-2.6.24-rc2/net/ipv6/route.c 2007-11-19 16:06:00.000000000 -0800
@@ -1668,6 +1668,8 @@ struct rt6_info *rt6_get_dflt_router(str
return rt;
}
+EXPORT_SYMBOL(rt6_get_dflt_router);
+
struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr,
struct net_device *dev,
unsigned int pref)
--- linux-2.6.24-rc2/net/ipv6/sit.c.orig 2007-11-08 12:03:41.000000000
-0800
+++ linux-2.6.24-rc2/net/ipv6/sit.c 2007-11-19 16:15:01.000000000 -0800
@@ -16,6 +16,7 @@
* Changes:
* Roger Venning <[EMAIL PROTECTED]>: 6to4 support
* Nate Thompson <[EMAIL PROTECTED]>: 6to4 support
+ * Fred L. Templin <[EMAIL PROTECTED]>: isatap support
*/
#include <linux/module.h>
@@ -182,6 +183,9 @@ static struct ip_tunnel * ipip6_tunnel_l
dev->init = ipip6_tunnel_init;
nt->parms = *parms;
+ if (parms->i_flags & SIT_ISATAP)
+ dev->priv_flags |= IFF_ISATAP;
+
if (register_netdevice(dev) < 0) {
free_netdev(dev);
goto failed;
@@ -364,6 +368,48 @@ static inline void ipip6_ecn_decapsulate
IP6_ECN_set_ce(ipv6_hdr(skb));
}
+/* ISATAP (RFC4214) - check source address */
+static int
+isatap_srcok(struct sk_buff *skb, struct iphdr *iph, struct net_device *dev)
+{
+ struct neighbour *neigh;
+ struct dst_entry *dst;
+ struct rt6_info *rt;
+ struct flowi fl;
+ struct in6_addr *addr6;
+ struct in6_addr rtr;
+ struct ipv6hdr *iph6;
+ int ok = 0;
+
+ /* from onlink default router */
+ ipv6_addr_set(&rtr, htonl(0xFE800000), 0, 0, 0);
+ ipv6_isatap_eui64(rtr.s6_addr + 8, iph->saddr);
+ if ((rt = rt6_get_dflt_router(&rtr, dev))) {
+ dst_release(&rt->u.dst);
+ return 1;
+ }
+
+ iph6 = ipv6_hdr(skb);
+ memset(&fl, 0, sizeof(fl));
+ fl.proto = iph6->nexthdr;
+ ipv6_addr_copy(&fl.fl6_dst, &iph6->saddr);
+ fl.oif = dev->ifindex;
+ security_skb_classify_flow(skb, &fl);
+
+ dst = ip6_route_output(NULL, &fl);
+ if (!dst->error && (dst->dev == dev) && (neigh = dst->neighbour)) {
+
+ addr6 = (struct in6_addr*)&neigh->primary_key;
+
+ /* from correct previous hop */
+ if (ipv6_addr_is_isatap(addr6) &&
+ (addr6->s6_addr32[3] == iph->saddr))
+ ok = 1;
+ }
+ dst_release(dst);
+ return ok;
+}
+
static int ipip6_rcv(struct sk_buff *skb)
{
struct iphdr *iph;
@@ -382,6 +428,14 @@ static int ipip6_rcv(struct sk_buff *skb
IPCB(skb)->flags = 0;
skb->protocol = htons(ETH_P_IPV6);
skb->pkt_type = PACKET_HOST;
+
+ if ((tunnel->dev->priv_flags & IFF_ISATAP) &&
+ !isatap_srcok(skb, iph, tunnel->dev)) {
+ tunnel->stat.rx_errors++;
+ read_unlock(&ipip6_lock);
+ kfree_skb(skb);
+ return 0;
+ }
tunnel->stat.rx_packets++;
tunnel->stat.rx_bytes += skb->len;
skb->dev = tunnel->dev;
@@ -444,6 +498,29 @@ static int ipip6_tunnel_xmit(struct sk_b
if (skb->protocol != htons(ETH_P_IPV6))
goto tx_error;
+ /* ISATAP (RFC4214) - must come before 6to4 */
+ if (dev->priv_flags & IFF_ISATAP) {
+ struct neighbour *neigh = NULL;
+
+ if (skb->dst)
+ neigh = skb->dst->neighbour;
+
+ if (neigh == NULL) {
+ if (net_ratelimit())
+ printk(KERN_DEBUG "sit: nexthop == NULL\n");
+ goto tx_error;
+ }
+
+ addr6 = (struct in6_addr*)&neigh->primary_key;
+ addr_type = ipv6_addr_type(addr6);
+
+ if ((addr_type & IPV6_ADDR_UNICAST) &&
+ ipv6_addr_is_isatap(addr6))
+ dst = addr6->s6_addr32[3];
+ else
+ goto tx_error;
+ }
+
if (!dst)
dst = try_6to4(&iph6->daddr);
-
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
