[IPSEC]: Changing API of xfrm4_tunnel_register.
Kazunori MIYAZAWA [Tue, 13 Feb 2007 20:54:47 +0000 (12:54 -0800)]
This patch changes xfrm4_tunnel register and deregister
interface to prepare for solving the conflict of device
tunnels with inter address family IPsec tunnel.

Signed-off-by: Kazunori MIYAZAWA <miyazawa@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/xfrm.h
net/ipv4/ipip.c
net/ipv4/tunnel4.c
net/ipv4/xfrm4_input.c
net/ipv4/xfrm4_tunnel.c

index 16924cb..20be8be 100644 (file)
@@ -946,8 +946,8 @@ extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
 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,
index 475bcd1..9b561e6 100644 (file)
@@ -871,7 +871,7 @@ static int __init ipip_init(void)
 
        printk(banner);
 
-       if (xfrm4_tunnel_register(&ipip_handler)) {
+       if (xfrm4_tunnel_register(&ipip_handler, AF_INET)) {
                printk(KERN_INFO "ipip init: can't register tunnel\n");
                return -EAGAIN;
        }
@@ -893,7 +893,7 @@ static int __init ipip_init(void)
  err2:
        free_netdev(ipip_fb_tunnel_dev);
  err1:
-       xfrm4_tunnel_deregister(&ipip_handler);
+       xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
        goto out;
 }
 
@@ -913,7 +913,7 @@ static void __exit ipip_destroy_tunnels(void)
 
 static void __exit ipip_fini(void)
 {
-       if (xfrm4_tunnel_deregister(&ipip_handler))
+       if (xfrm4_tunnel_deregister(&ipip_handler, AF_INET))
                printk(KERN_INFO "ipip close: can't deregister tunnel\n");
 
        rtnl_lock();
index 8d30c48..a794a8c 100644 (file)
 #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_tunnel *handler)
 
        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 +89,26 @@ drop:
        return 0;
 }
 
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+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;
+}
+#endif
+
 static void tunnel4_err(struct sk_buff *skb, u32 info)
 {
        struct xfrm_tunnel *handler;
@@ -101,17 +124,36 @@ static struct net_protocol tunnel4_protocol = {
        .no_policy      =       1,
 };
 
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+static struct net_protocol tunnel64_protocol = {
+       .handler        =       tunnel64_rcv,
+       .err_handler    =       tunnel4_err,
+       .no_policy      =       1,
+};
+#endif
+
 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 defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+       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;
+       }
+#endif
        return 0;
 }
 
 static void __exit tunnel4_fini(void)
 {
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+       if (inet_del_protocol(&tunnel64_protocol, IPPROTO_IPV6))
+               printk(KERN_ERR "tunnel64 close: can't remove protocol\n");
+#endif
        if (inet_del_protocol(&tunnel4_protocol, IPPROTO_IPIP))
                printk(KERN_ERR "tunnel4 close: can't remove protocol\n");
 }
index 289146b..78e80de 100644 (file)
@@ -27,6 +27,7 @@ static int xfrm4_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32
 {
        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, __u16 encap_type)
                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;
 
index 1be6762..3eef064 100644 (file)
@@ -64,24 +64,45 @@ static struct xfrm_tunnel xfrm_tunnel_handler = {
        .priority       =       2,
 };
 
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+static struct xfrm_tunnel xfrm64_tunnel_handler = {
+       .handler        =       xfrm4_rcv,
+       .err_handler    =       xfrm_tunnel_err,
+       .priority       =       2,
+};
+#endif
+
 static int __init ipip_init(void)
 {
        if (xfrm_register_type(&ipip_type, AF_INET) < 0) {
                printk(KERN_INFO "ipip init: can't add xfrm type\n");
                return -EAGAIN;
        }
-       if (xfrm4_tunnel_register(&xfrm_tunnel_handler)) {
-               printk(KERN_INFO "ipip init: can't add xfrm handler\n");
+
+       if (xfrm4_tunnel_register(&xfrm_tunnel_handler, AF_INET)) {
+               printk(KERN_INFO "ipip init: can't add xfrm handler for AF_INET\n");
+               xfrm_unregister_type(&ipip_type, AF_INET);
+               return -EAGAIN;
+       }
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+       if (xfrm4_tunnel_register(&xfrm64_tunnel_handler, AF_INET6)) {
+               printk(KERN_INFO "ipip init: can't add xfrm handler for AF_INET6\n");
+               xfrm4_tunnel_deregister(&xfrm_tunnel_handler, AF_INET);
                xfrm_unregister_type(&ipip_type, AF_INET);
                return -EAGAIN;
        }
+#endif
        return 0;
 }
 
 static void __exit ipip_fini(void)
 {
-       if (xfrm4_tunnel_deregister(&xfrm_tunnel_handler))
-               printk(KERN_INFO "ipip close: can't remove xfrm handler\n");
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+       if (xfrm4_tunnel_deregister(&xfrm64_tunnel_handler, AF_INET6))
+               printk(KERN_INFO "ipip close: can't remove xfrm handler for AF_INET6\n");
+#endif
+       if (xfrm4_tunnel_deregister(&xfrm_tunnel_handler, AF_INET))
+               printk(KERN_INFO "ipip close: can't remove xfrm handler for AF_INET\n");
        if (xfrm_unregister_type(&ipip_type, AF_INET) < 0)
                printk(KERN_INFO "ipip close: can't remove xfrm type\n");
 }