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Date: Tue, 6 Nov 2007 17:16:07 -0800
From: "Templin, Fred L" <Fred.L.Templin@...ing.com>
To: <netdev@...r.kernel.org>
Subject: [PATCH 03/05] ipv6: RFC4214 Support
From: Fred L. Templin <fred.l.templin@...ing.com>
This is experimental support for the Intra-Site Automatic
Tunnel Addressing Protocol (ISATAP) per RFC4214. It uses
the SIT module, and is configured using the unmodified
"ip" utility with device names beginning with: "isatap".
The following diffs are specific to the Linux 2.6.23
kernel distribution.
Signed-off-by: Fred L. Templin <fred.l.templin@...ing.com>
---
--- linux-2.6.23/net/ipv6/addrconf.c.orig 2007-10-09
13:31:38.000000000 -0700
+++ linux-2.6.23/net/ipv6/addrconf.c 2007-10-31 13:08:45.000000000
-0700
@@ -73,7 +73,11 @@
#include <net/tcp.h>
#include <net/ip.h>
#include <net/netlink.h>
+#if defined(CONFIG_IPV6_ISATAP)
+#include <net/ipip.h>
+#else
#include <linux/if_tunnel.h>
+#endif
#include <linux/rtnetlink.h>
#ifdef CONFIG_IPV6_PRIVACY
@@ -1426,6 +1430,11 @@ static int ipv6_generate_eui64(u8 *eui,
return addrconf_ifid_arcnet(eui, dev);
case ARPHRD_INFINIBAND:
return addrconf_ifid_infiniband(eui, dev);
+#if defined(CONFIG_IPV6_ISATAP)
+ case ARPHRD_SIT:
+ if (dev->priv_flags&IFF_ISATAP)
+ return ipv6_isatap_eui64(eui, (__be32 *)dev->dev_addr);
+#endif
}
return -1;
}
@@ -2138,7 +2147,6 @@ static void addrconf_add_linklocal(struc
addr_flags |= IFA_F_OPTIMISTIC;
#endif
-
ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
if (!IS_ERR(ifp)) {
addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
idev->dev, 0, 0);
@@ -2192,6 +2200,32 @@ static void addrconf_sit_config(struct n
return;
}
+#if defined(CONFIG_IPV6_ISATAP)
+ /* ISATAP (RFC4214) - configure as NBMA link */
+ if (dev->priv_flags&IFF_ISATAP) {
+ struct in6_addr addr;
+
+ addrconf_add_lroute(dev);
+
+ addr.s6_addr32[0] = htonl(0xFE800000);
+ addr.s6_addr32[1] = 0;
+
+ if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) {
+ struct inet6_ifaddr *ifp;
+
+ if (!IS_ERR(ifp = ipv6_add_addr(idev, &addr, 64,
+ IFA_LINK, IFA_F_PERMANENT))) {
+ addrconf_prefix_route(&ifp->addr,
ifp->prefix_len,
+ idev->dev, 0, 0);
+ addrconf_dad_start(ifp, 0);
+ in6_ifa_put(ifp);
+ }
+ }
+
+ return;
+ }
+#endif
+
sit_add_v4_addrs(idev);
if (dev->flags&IFF_POINTOPOINT) {
@@ -2521,6 +2555,16 @@ static void addrconf_rs_timer(unsigned l
* Announcement received after solicitation
* was sent
*/
+#if defined(CONFIG_IPV6_ISATAP)
+ /* ISATAP (RFC4214) - Re-DAD to trigger new RS/RA */
+ if (ifp->idev->dev->priv_flags & IFF_ISATAP) {
+ spin_lock(&ifp->lock);
+ ifp->probes = 0;
+ ifp->idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD);
+ addrconf_mod_timer(ifp, AC_DAD, HZ*120);
+ spin_unlock(&ifp->lock);
+ }
+#endif
goto out;
}
@@ -2535,10 +2579,32 @@ static void addrconf_rs_timer(unsigned l
ifp->idev->cnf.rtr_solicit_interval);
spin_unlock(&ifp->lock);
+#if defined(CONFIG_IPV6_ISATAP)
+ /* ISATAP (RFC4214) - unicast RS */
+ if (ifp->idev->dev->priv_flags & IFF_ISATAP) {
+ struct ip_tunnel *t = netdev_priv(ifp->idev->dev);
+ __be32 rtr = t->parms.i_key;
+
+ if (!rtr) goto out;
+
+ all_routers.s6_addr32[0] = htonl(0xFE800000);
+ all_routers.s6_addr32[1] = 0;
+ ipv6_isatap_eui64(all_routers.s6_addr + 8, &rtr);
+
+ } else
+#endif
ipv6_addr_all_routers(&all_routers);
ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
} else {
+#if defined(CONFIG_IPV6_ISATAP)
+ /* ISATAP (RFC4214) - Re-DAD to trigger new RS/RA */
+ if (ifp->idev->dev->priv_flags & IFF_ISATAP) {
+ ifp->probes = 0;
+ ifp->idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD);
+ addrconf_mod_timer(ifp, AC_DAD, HZ*120);
+ }
+#endif
spin_unlock(&ifp->lock);
/*
* Note: we do not support deprecated "all on-link"
@@ -2584,6 +2650,9 @@ static void addrconf_dad_start(struct in
spin_lock_bh(&ifp->lock);
if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
+#if defined(CONFIG_IPV6_ISATAP)
+ dev->priv_flags&IFF_ISATAP ||
+#endif
!(ifp->flags&IFA_F_TENTATIVE) ||
ifp->flags & IFA_F_NODAD) {
ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
@@ -2680,6 +2749,20 @@ static void addrconf_dad_completed(struc
(ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
struct in6_addr all_routers;
+#if defined(CONFIG_IPV6_ISATAP)
+ /* ISATAP (RFC4214) - unicast RS */
+ if (ifp->idev->dev->priv_flags & IFF_ISATAP) {
+ struct ip_tunnel *t = netdev_priv(ifp->idev->dev);
+ __be32 rtr = t->parms.i_key;
+
+ if (!rtr) return;
+
+ all_routers.s6_addr32[0] = htonl(0xFE800000);
+ all_routers.s6_addr32[1] = 0;
+ ipv6_isatap_eui64(all_routers.s6_addr + 8, &rtr);
+
+ } else
+#endif
ipv6_addr_all_routers(&all_routers);
/*
-
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