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[IPV6]: Add RFC4214 support

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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>
This commit is contained in:
Fred L. Templin 2007-11-29 22:11:40 +11:00 committed by David S. Miller
parent df97c708d5
commit c7dc89c0ac
7 changed files with 131 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/linux/if.h
View File

@ -63,6 +63,7 @@
#define IFF_MASTER_ALB 0x10 /* bonding master, balance-alb. */
#define IFF_BONDING 0x20 /* bonding master or slave */
#define IFF_SLAVE_NEEDARP 0x40 /* need ARPs for validation */
#define IFF_ISATAP 0x80 /* ISATAP interface (RFC4214) */
#define IF_GET_IFACE 0x0001 /* for querying only */
#define IF_GET_PROTO 0x0002

3
include/linux/if_tunnel.h
View File

@ -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];

8
include/linux/in.h
View File

@ -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 */

19
include/net/addrconf.h
View File

@ -17,6 +17,7 @@
#define IPV6_MAX_ADDRESSES 16
#include <linux/in.h>
#include <linux/in6.h>
struct prefix_info {
@ -249,6 +250,24 @@ static inline int ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
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);

22
net/ipv6/addrconf.c
View File

@ -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) {

2
net/ipv6/route.c
View File

@ -1659,6 +1659,8 @@ struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *d
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)

77
net/ipv6/sit.c
View File

@ -16,6 +16,7 @@
* Changes:
* Roger Venning <r.venning@telstra.com>: 6to4 support
* Nate Thompson <nate@thebog.net>: 6to4 support
* Fred L. Templin <fltemplin@acm.org>: isatap support
*/
#include <linux/module.h>
@ -182,6 +183,9 @@ static struct ip_tunnel * ipip6_tunnel_locate(struct ip_tunnel_parm *parms, int
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(struct iphdr *iph, struct sk_buff *skb)
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_buff *skb, struct net_device *dev)
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);