beet-interfamily-and-sleep-loopback-2.6.19.7.patch

HIP：Host Identity Protocol

diff -urN  a/net/ipv4/xfrm4_mode_beet.c b/net/ipv4/xfrm4_mode_beet.c
--- a/net/ipv4/xfrm4_mode_beet.c 2007-05-25 14:44:51.000000000 +0300
+++ b/net/ipv4/xfrm4_mode_beet.c 2007-05-25 14:44:51.000000000 +0300
@@ -6,6 +6,7 @@
  *                    Herbert Xu     <[e-mail]>
  *                    Abhinav Pathak <[e-mail]>
  *                    Jeff Ahrenholz <[e-mail]>
+ *                    Joakim Koskela <[e-mail]>
  */
 
 #include <linux/init.h>
@@ -14,100 +15,172 @@
 #include <linux/skbuff.h>
 #include <linux/stringify.h>
 #include <net/dst.h>
+#include <net/dsfield.h>
 #include <net/ip.h>
+#include <net/inet_ecn.h>
 #include <net/xfrm.h>
 
-/* Add encapsulation header.
- *
- * The top IP header will be constructed per draft-nikander-esp-beet-mode-06.txt.
- * The following fields in it shall be filled in by x->type->output:
- *      tot_len
- *      check
- *
- * On exit, skb->h will be set to the start of the payload to be processed
- * by x->type->output and skb->nh will be set to the top IP header.
- */
 static int xfrm4_beet_output(struct xfrm_state *x, struct sk_buff *skb)
 {
-	struct iphdr *iph, *top_iph = NULL;
-	int hdrlen, optlen;
-
-	iph = skb->nh.iph;
-	skb->h.ipiph = iph;
-
-	hdrlen = 0;
-	optlen = iph->ihl * 4 - sizeof(*iph);
-	if (unlikely(optlen))
-		hdrlen += IPV4_BEET_PHMAXLEN - (optlen & 4);
-
-	skb->nh.raw = skb_push(skb, x->props.header_len + hdrlen);
-	top_iph = skb->nh.iph;
-	hdrlen = iph->ihl * 4 - optlen;
-	skb->h.raw += hdrlen;
-
-	memmove(top_iph, iph, hdrlen);
-	if (unlikely(optlen)) {
-		struct ip_beet_phdr *ph;
-
-		BUG_ON(optlen < 0);
-
-		ph = (struct ip_beet_phdr *)skb->h.raw;
-		ph->padlen = 4 - (optlen & 4);
-		ph->hdrlen = (optlen + ph->padlen + sizeof(*ph)) / 8;
-		ph->nexthdr = top_iph->protocol;
+        struct dst_entry *dst = skb->dst;
+        int hdrlen;
+        struct iphdr *iphv4, *top_iphv4;
+        struct ipv6hdr *iphv6, *top_iphv6;
+
+        if (skb->nh.iph->version == 4) {
+                
+                int optlen;
+
+                /* 4-4 */
+
+                iphv4 = skb->nh.iph;
+                skb->h.ipiph = iphv4;
+                
+                hdrlen = x->props.header_len;
+
+                optlen = iphv4->ihl * 4 - sizeof(*iphv4);
+
+                if (!optlen) {
+                        hdrlen -= IPV4_BEET_PHMAXLEN;
+                } else {
+                        skb->h.raw -= (IPV4_BEET_PHMAXLEN - (optlen & 4));
+                        hdrlen -= optlen & 4;
+                }
+                
+                skb->nh.raw = skb_push(skb, hdrlen);
+                                
+                top_iphv4 = skb->nh.iph;
+                hdrlen = iphv4->ihl * 4 - optlen;
+                skb->h.raw += hdrlen;
+                memmove(top_iphv4, iphv4, hdrlen);
+                
+                if (unlikely(optlen)) {
+                        struct ip_beet_phdr *ph;
+                        
+                        BUG_ON(optlen < 0);
+                        
+                        ph = (struct ip_beet_phdr *)skb->h.raw;
+                        ph->padlen = 4 - (optlen & 4);
+                        ph->hdrlen = (optlen + ph->padlen + sizeof(*ph)) / 8;
+                        ph->nexthdr = iphv4->protocol;
+                        top_iphv4->protocol = IPPROTO_BEETPH;
+                        top_iphv4->ihl = sizeof(struct iphdr) / 4;
+                }
+                
+                top_iphv4->saddr = x->props.saddr.a4;
+                top_iphv4->daddr = x->id.daddr.a4;
+                
+                skb->protocol = htons(ETH_P_IP);
+
+	} else if (skb->nh.iph->version == 6) {
+                
+                u8 protocol;
+                int delta = sizeof(struct ipv6hdr) - sizeof(struct iphdr);
+
+                /* Inner = 6, Outer = 4 : changing the external IP hdr
+                 * to the outer addresses
+                 */
+
+                hdrlen = x->props.header_len - IPV4_BEET_PHMAXLEN;
+                skb_push(skb, hdrlen);
+                iphv6 = skb->nh.ipv6h;
+                
+                skb->nh.raw = skb->data;
+                top_iphv6 = skb->nh.ipv6h;
+
+                protocol = iphv6->nexthdr;
+                skb->nh.raw = skb_pull(skb, delta);
+                top_iphv4 = skb->nh.iph;
+                skb->h.raw = skb->data + hdrlen;
+                top_iphv4->ihl = (sizeof(struct iphdr) >> 2);
+                top_iphv4->version = 4;
+                top_iphv4->id = 0;
+                top_iphv4->frag_off = htons(IP_DF);
+                top_iphv4->ttl = dst_metric(dst->child, RTAX_HOPLIMIT);
+                top_iphv4->saddr = x->props.saddr.a4;
+                top_iphv4->daddr = x->id.daddr.a4;
+                skb->h.raw += top_iphv4->ihl*4;
+                top_iphv4->protocol = protocol;
+         
+                skb->protocol = htons(ETH_P_IP);
+        } else 
+                BUG_ON(1);
+        
+	return 0; 
 
-		top_iph->protocol = IPPROTO_BEETPH;
-		top_iph->ihl = sizeof(struct iphdr) / 4;
-	}
-
-	top_iph->saddr = x->props.saddr.a4;
-	top_iph->daddr = x->id.daddr.a4;
 
-	return 0;
 }
 
 static int xfrm4_beet_input(struct xfrm_state *x, struct sk_buff *skb)
 {
 	struct iphdr *iph = skb->nh.iph;
+	int hops = skb->nh.iph->ttl;
 	int phlen = 0;
 	int optlen = 0;
+	int size = (x->sel.family == AF_INET) ? sizeof(struct iphdr) : sizeof(struct ipv6hdr);
+	int delta = sizeof(struct ipv6hdr) - sizeof(struct iphdr);
 	__u8 ph_nexthdr = 0, protocol = 0;
 	int err = -EINVAL;
 
 	protocol = iph->protocol;
 
-	if (unlikely(iph->protocol == IPPROTO_BEETPH)) {
-		struct ip_beet_phdr *ph = (struct ip_beet_phdr*)(iph + 1);
-
-		if (!pskb_may_pull(skb, sizeof(*ph)))
-			goto out;
+	if (x->sel.family == AF_INET6) {
+		/* Here, the inner family is 6, therefore I have to
+		 * substitute the IPhdr by enlarging it */
+		if (skb_tailroom(skb) <  delta){
+			if (pskb_expand_head(skb, 0, delta, GFP_ATOMIC))
+				goto out;
+		}
+		skb->nh.raw -= delta;
+	} else if (x->sel.family == AF_INET) {
+		if (unlikely(iph->protocol == IPPROTO_BEETPH)) {
+			struct ip_beet_phdr *ph = (struct ip_beet_phdr*)(iph + 1);
+
+			if (!pskb_may_pull(skb, sizeof(*ph)))
+				goto out;
+
+			phlen = ph->hdrlen * 8;
+			optlen = phlen - ph->padlen - sizeof(*ph);
+			if (optlen < 0 || optlen & 3 || optlen > 250)
+				goto out;
+
+			if (!pskb_may_pull(skb, phlen))
+				goto out;
+
+			ph_nexthdr = ph->nexthdr;
+		}
+	} else
+		BUG_ON(1);
 
-		phlen = ph->hdrlen * 8;
-		optlen = phlen - ph->padlen - sizeof(*ph);
-		if (optlen < 0 || optlen & 3 || optlen > 250)
-			goto out;
-
-		if (!pskb_may_pull(skb, phlen))
-			goto out;
-
-		ph_nexthdr = ph->nexthdr;
-	}
-
-	skb_push(skb, sizeof(*iph) - phlen + optlen);
+	size += (optlen - phlen);
+	skb_push(skb, size);
 	memmove(skb->data, skb->nh.raw, sizeof(*iph));
 	skb->nh.raw = skb->data;
 
-	iph = skb->nh.iph;
-	iph->ihl = (sizeof(*iph) + optlen) / 4;
-	iph->tot_len = htons(skb->len);
-	iph->daddr = x->sel.daddr.a4;
-	iph->saddr = x->sel.saddr.a4;
-	if (ph_nexthdr)
-		iph->protocol = ph_nexthdr;
-	else
-		iph->protocol = protocol;
-	iph->check = 0;
-	iph->check = ip_fast_csum(skb->nh.raw, iph->ihl);
+	if (x->sel.family == AF_INET) {
+		iph = skb->nh.iph;
+		iph->ihl = (sizeof(*iph) + optlen) / 4;
+		iph->tot_len = htons(skb->len);
+		iph->daddr = x->sel.daddr.a4;
+		iph->saddr = x->sel.saddr.a4;
+		if (ph_nexthdr)
+			iph->protocol = ph_nexthdr;
+		else
+			iph->protocol = protocol;
+		iph->check = 0;
+		iph->check = ip_fast_csum(skb->nh.raw, iph->ihl);
+	} else if (x->sel.family == AF_INET6) {
+		struct ipv6hdr *ip6h = skb->nh.ipv6h;
+		memset(ip6h->flow_lbl, 0, sizeof(ip6h->flow_lbl));
+		ip6h->version = 6;
+		ip6h->priority = 0;
+		ip6h->nexthdr = protocol;
+		ip6h->hop_limit = hops;
+		ip6h->payload_len = htons(skb->len - size);
+		ipv6_addr_copy(&ip6h->daddr, (struct in6_addr *)&x->sel.daddr.a6);
+		ipv6_addr_copy(&ip6h->saddr, (struct in6_addr *)&x->sel.saddr.a6);
+		skb->protocol = htons(ETH_P_IPV6);
+	}
 	err = 0;
 out:
 	return err;
diff -urN  a/net/ipv4/xfrm4_policy.c b/net/ipv4/xfrm4_policy.c
--- a/net/ipv4/xfrm4_policy.c 2007-05-25 14:44:51.000000000 +0300
+++ b/net/ipv4/xfrm4_policy.c 2007-05-25 14:44:51.000000000 +0300
@@ -15,6 +15,7 @@
 
 static struct dst_ops xfrm4_dst_ops;
 static struct xfrm_policy_afinfo xfrm4_policy_afinfo;
+static void xfrm4_update_pmtu(struct dst_entry *dst, u32 mtu);
 
 static int xfrm4_dst_lookup(struct xfrm_dst **dst, struct flowi *fl)
 {
@@ -72,17 +73,20 @@
 	struct dst_entry *dst, *dst_prev;
 	struct rtable *rt0 = (struct rtable*)(*dst_p);
 	struct rtable *rt = rt0;
-	u32 remote = fl->fl4_dst;
-	u32 local  = fl->fl4_src;
 	struct flowi fl_tunnel = {
 		.nl_u = {
 			.ip4_u = {
-				.saddr = local,
-				.daddr = remote,
+				.saddr = fl->fl4_src,
+				.daddr = fl->fl4_dst,
 				.tos = fl->fl4_tos
 			}
 		}
 	};
+	union {
+		struct in6_addr *in6;
+		struct in_addr *in;
+	} remote, local;
+	unsigned short outer_family6 = 0;
 	int i;
 	int err;
 	int header_len = 0;
@@ -94,7 +98,7 @@
 	for (i = 0; i < nx; i++) {
 		struct dst_entry *dst1 = dst_alloc(&xfrm4_dst_ops);
 		struct xfrm_dst *xdst;
-		int tunnel = 0;
+		unsigned short outer_family = 0;
 
 		if (unlikely(dst1 == NULL)) {
 			err = -ENOBUFS;
@@ -117,20 +121,41 @@
 		dst1->next = dst_prev;
 		dst_prev = dst1;
 		if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
-			remote = xfrm[i]->id.daddr.a4;
-			local  = xfrm[i]->props.saddr.a4;
-			tunnel = 1;
+			outer_family = xfrm[i]->props.family;
+			if(outer_family == AF_INET){
+				remote.in = (struct in_addr*)&xfrm[i]->id.daddr.a4;
+				local.in  = (struct in_addr*)&xfrm[i]->props.saddr.a4;
+			} else if (outer_family == AF_INET6){
+				outer_family6 = 1;
+				remote.in6 = (struct in6_addr*)xfrm[i]->id.daddr.a6;
+				local.in6 = (struct in6_addr*)xfrm[i]->props.saddr.a6;                                
+			} else
+				  BUG_ON(1);
 		}
 		header_len += xfrm[i]->props.header_len;
 		trailer_len += xfrm[i]->props.trailer_len;
 
-		if (tunnel) {
-			fl_tunnel.fl4_src = local;
-			fl_tunnel.fl4_dst = remote;
+		if (outer_family) {
+			switch (outer_family) {
+			default:
+			case AF_INET:
+				fl_tunnel.fl4_src = local.in->s_addr;
+				fl_tunnel.fl4_dst = remote.in->s_addr;
+				break;
+			case AF_INET6:
+				ipv6_addr_copy(&fl_tunnel.fl6_src, local.in6);
+				ipv6_addr_copy(&fl_tunnel.fl6_dst, remote.in6);
+				break;
+			}
 			err = xfrm_dst_lookup((struct xfrm_dst **)&rt,
-					      &fl_tunnel, AF_INET);
+					      &fl_tunnel, outer_family);
 			if (err)
 				goto error;
+			/* Without this, the atomic inc below segfaults */
+			if (outer_family == AF_INET6) {
+				rt->peer = NULL;
+				rt_bind_peer(rt,1);
+			}
 		} else
 			dst_hold(&rt->u.dst);
 	}
@@ -181,6 +206,12 @@
 	}
 
 	xfrm_init_pmtu(dst);
+	if (outer_family6) {
+		/* The worst case */
+		int delta = sizeof(struct ipv6hdr) - sizeof(struct iphdr);
+		u32 mtu = dst_mtu(dst);
+		xfrm4_update_pmtu(dst, mtu - delta);
+	}
 	return 0;
 
 error:
diff -urN  a/net/ipv4/esp4.c b/net/ipv4/esp4.c
--- a/net/ipv4/esp4.c 2007-05-25 14:44:51.000000000 +0300
+++ b/net/ipv4/esp4.c 2007-05-25 14:44:51.000000000 +0300
@@ -402,6 +402,8 @@
 	x->props.header_len = sizeof(struct ip_esp_hdr) + esp->conf.ivlen;
 	if (x->props.mode == XFRM_MODE_TUNNEL)
 		x->props.header_len += sizeof(struct iphdr);
+	else if (x->props.mode == XFRM_MODE_BEET)
+		x->props.header_len += IPV4_BEET_PHMAXLEN;
 	if (x->encap) {
 		struct xfrm_encap_tmpl *encap = x->encap;
 
diff -urN  a/net/ipv4/ipip.c b/net/ipv4/ipip.c
--- a/net/ipv4/ipip.c 2007-05-25 14:44:51.000000000 +0300
+++ b/net/ipv4/ipip.c 2007-05-25 14:44:51.000000000 +0300
@@ -870,7 +870,7 @@
 
 	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;
 	}
@@ -892,7 +892,7 @@
  err2:
 	free_netdev(ipip_fb_tunnel_dev);
  err1:
-	xfrm4_tunnel_deregister(&ipip_handler);
+	xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
 	goto out;
 }
 
@@ -912,7 +912,7 @@
 
 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();
diff -urN  a/net/ipv4/xfrm4_output.c b/net/ipv4/xfrm4_output.c
--- a/net/ipv4/xfrm4_output.c 2007-05-25 14:44:51.000000000 +0300
+++ b/net/ipv4/xfrm4_output.c 2007-05-25 14:44:51.000000000 +0300
@@ -66,7 +66,7 @@
 		if (err)
 			goto error;
 
-		err = x->mode->output(x, skb);
+                err = x->mode->output(x, skb);
 		if (err)
 			goto error;
 
diff -urN  a/net/ipv4/xfrm4_tunnel.c b/net/ipv4/xfrm4_tunnel.c
--- a/net/ipv4/xfrm4_tunnel.c 2007-05-25 14:44:51.000000000 +0300
+++ b/net/ipv4/xfrm4_tunnel.c 2007-05-25 14:44:51.000000000 +0300
@@ -13,7 +13,7 @@
 static int ipip_output(struct xfrm_state *x, struct sk_buff *skb)
 {
 	struct iphdr *iph;
-	
+
 	iph = skb->nh.iph;
 	iph->tot_len = htons(skb->len);
 	ip_send_check(iph);
@@ -28,7 +28,7 @@
 
 static int ipip_init_state(struct xfrm_state *x)
 {
-	if (x->props.mode != XFRM_MODE_TUNNEL)
+  if (x->props.mode != XFRM_MODE_TUNNEL || x->props.mode != XFRM_MODE_BEET)
 		return -EINVAL;
 
 	if (x->encap)
@@ -64,24 +64,45 @@
 	.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)) {