This patch extends xfrm4_tunnel utility to support inter address family
tunnel, which is IPv6 over IPv4 tunnel (aka sit).
signed-off-by Kazunori MIYAZAWA <[EMAIL PROTECTED]>
---
include/net/xfrm.h | 4 ++--
net/ipv4/tunnel4.c | 42 ++++++++++++++++++++++++++++++++++++++----
net/ipv4/xfrm4_input.c | 4 +++-
3 files changed, 43 insertions(+), 7 deletions(-)
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index bf91d63..3ee0995 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -932,8 +932,8 @@ extern int xfrm_state_mtu(struct xfrm_st
extern int xfrm_init_state(struct xfrm_state *x);
extern int xfrm4_rcv(struct sk_buff *skb);
extern int xfrm4_output(struct sk_buff *skb);
-extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler);
-extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler);
+extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short
family);
+extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short
family);
extern int xfrm6_rcv_spi(struct sk_buff *skb, __be32 spi);
extern int xfrm6_rcv(struct sk_buff **pskb);
extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
diff --git a/net/ipv4/tunnel4.c b/net/ipv4/tunnel4.c
index 8d30c48..1112707 100644
--- a/net/ipv4/tunnel4.c
+++ b/net/ipv4/tunnel4.c
@@ -14,9 +14,10 @@ #include <net/protocol.h>
#include <net/xfrm.h>
static struct xfrm_tunnel *tunnel4_handlers;
+static struct xfrm_tunnel *tunnel64_handlers;
static DEFINE_MUTEX(tunnel4_mutex);
-int xfrm4_tunnel_register(struct xfrm_tunnel *handler)
+int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family)
{
struct xfrm_tunnel **pprev;
int ret = -EEXIST;
@@ -24,7 +25,8 @@ int xfrm4_tunnel_register(struct xfrm_tu
mutex_lock(&tunnel4_mutex);
- for (pprev = &tunnel4_handlers; *pprev; pprev = &(*pprev)->next) {
+ for (pprev = (family == AF_INET) ? &tunnel4_handlers :
&tunnel64_handlers;
+ *pprev; pprev = &(*pprev)->next) {
if ((*pprev)->priority > priority)
break;
if ((*pprev)->priority == priority)
@@ -44,14 +46,15 @@ err:
EXPORT_SYMBOL(xfrm4_tunnel_register);
-int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler)
+int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family)
{
struct xfrm_tunnel **pprev;
int ret = -ENOENT;
mutex_lock(&tunnel4_mutex);
- for (pprev = &tunnel4_handlers; *pprev; pprev = &(*pprev)->next) {
+ for (pprev = (family == AF_INET) ? &tunnel4_handlers :
&tunnel64_handlers;
+ *pprev; pprev = &(*pprev)->next) {
if (*pprev == handler) {
*pprev = handler->next;
ret = 0;
@@ -86,6 +89,24 @@ drop:
return 0;
}
+static int tunnel64_rcv(struct sk_buff *skb)
+{
+ struct xfrm_tunnel *handler;
+
+ if (!pskb_may_pull(skb, sizeof(struct iphdr)))
+ goto drop;
+
+ for (handler = tunnel64_handlers; handler; handler = handler->next)
+ if (!handler->handler(skb))
+ return 0;
+
+ icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
+
+drop:
+ kfree_skb(skb);
+ return 0;
+}
+
static void tunnel4_err(struct sk_buff *skb, u32 info)
{
struct xfrm_tunnel *handler;
@@ -101,17 +122,30 @@ static struct net_protocol tunnel4_proto
.no_policy = 1,
};
+static struct net_protocol tunnel64_protocol = {
+ .handler = tunnel64_rcv,
+ .err_handler = tunnel4_err,
+ .no_policy = 1,
+};
+
static int __init tunnel4_init(void)
{
if (inet_add_protocol(&tunnel4_protocol, IPPROTO_IPIP)) {
printk(KERN_ERR "tunnel4 init: can't add protocol\n");
return -EAGAIN;
}
+ if (inet_add_protocol(&tunnel64_protocol, IPPROTO_IPV6)) {
+ printk(KERN_ERR "tunnel64 init: can't add protocol\n");
+ inet_del_protocol(&tunnel4_protocol, IPPROTO_IPIP);
+ return -EAGAIN;
+ }
return 0;
}
static void __exit tunnel4_fini(void)
{
+ if (inet_del_protocol(&tunnel64_protocol, IPPROTO_IPV6))
+ printk(KERN_ERR "tunnel64 close: can't remove protocol\n");
if (inet_del_protocol(&tunnel4_protocol, IPPROTO_IPIP))
printk(KERN_ERR "tunnel4 close: can't remove protocol\n");
}
diff --git a/net/ipv4/xfrm4_input.c b/net/ipv4/xfrm4_input.c
index 8655d03..2c6a5fd 100644
--- a/net/ipv4/xfrm4_input.c
+++ b/net/ipv4/xfrm4_input.c
@@ -27,6 +27,7 @@ static int xfrm4_parse_spi(struct sk_buf
{
switch (nexthdr) {
case IPPROTO_IPIP:
+ case IPPROTO_IPV6:
*spi = skb->nh.iph->saddr;
*seq = 0;
return 0;
@@ -70,7 +71,8 @@ int xfrm4_rcv_encap(struct sk_buff *skb,
if (xfrm_nr == XFRM_MAX_DEPTH)
goto drop;
- x = xfrm_state_lookup((xfrm_address_t *)&iph->daddr, spi,
iph->protocol, AF_INET);
+ x = xfrm_state_lookup((xfrm_address_t *)&iph->daddr, spi,
+ iph->protocol != IPPROTO_IPV6 ? iph->protocol :
IPPROTO_IPIP, AF_INET);
if (x == NULL)
goto drop;
--
1.4.1
-
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