[PATCH net-2.6] [NET] The world is not perfect patch.

["Rami Rosen" <ramirose@gmail.com>]

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Hi,

There are three methods in the network stack which start with
#ifndef I_WISH_WORLD_WERE_PERFECT.

These methods are:
ipip_err() in net/ipv4/ipip.c
ipgre_err() in net/ipv4/ip_gre.c
ipip6_err() in net/ipv6/sit.c

When building the kernel with -DI_WISH_WORLD_WERE_PERFECT we have
various compilation
errors, mostly due to the fact that the corresponding code was not
updated recently.

(As we all know, indeed the world is not perfect, unluckily...)

This patch fixes these errors and enables building the kernel
successfully with -DI_WISH_WORLD_WERE_PERFECT.

(Note : I am not fully sure about correctness of len = skb->len, which I added;
feedback on this point is welcomed).


Regards,
Rami Rosen


Signed-off-by: Rami Rosen <ramirose@gmail.com>

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diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 2ada033..27c3938 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -399,9 +399,9 @@ out:
 	read_unlock(&ipgre_lock);
 	return;
 #else
-	struct iphdr *iph = (struct iphdr*)dp;
+	struct iphdr *iph = (struct iphdr*)skb->data;
 	struct iphdr *eiph;
-	__be16	     *p = (__be16*)(dp+(iph->ihl<<2));
+	__be16	     *p = (__be16*)(skb->data + (iph->ihl<<2));
 	const int type = icmp_hdr(skb)->type;
 	const int code = icmp_hdr(skb)->code;
 	int rel_type = 0;
@@ -413,7 +413,9 @@ out:
 	struct sk_buff *skb2;
 	struct flowi fl;
 	struct rtable *rt;
-
+	
+	int len = skb->len;
+	
 	if (p[1] != htons(ETH_P_IP))
 		return;
 
@@ -430,7 +432,7 @@ out:
 	}
 	if (len < grehlen + sizeof(struct iphdr))
 		return;
-	eiph = (struct iphdr*)(dp + grehlen);
+	eiph = (struct iphdr*)(skb->data + grehlen);
 
 	switch (type) {
 	default:
diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c
index 149111f..4474f41 100644
--- a/net/ipv4/ipip.c
+++ b/net/ipv4/ipip.c
@@ -338,7 +338,7 @@ out:
 	read_unlock(&ipip_lock);
 	return err;
 #else
-	struct iphdr *iph = (struct iphdr*)dp;
+	struct iphdr *iph = (struct iphdr*)skb->data;
 	int hlen = iph->ihl<<2;
 	struct iphdr *eiph;
 	const int type = icmp_hdr(skb)->type;
@@ -351,9 +351,11 @@ out:
 	struct flowi fl;
 	struct rtable *rt;
 
+	int len = skb->len;
+
 	if (len < hlen + sizeof(struct iphdr))
 		return 0;
-	eiph = (struct iphdr*)(dp + hlen);
+	eiph = (struct iphdr*)(skb->data + hlen);
 
 	switch (type) {
 	default:
@@ -414,10 +416,10 @@ out:
 
 	/* Try to guess incoming interface */
 	memset(&fl, 0, sizeof(fl));
-	fl.fl4_daddr = eiph->saddr;
+	fl.fl4_dst = eiph->saddr;
 	fl.fl4_tos = RT_TOS(eiph->tos);
 	fl.proto = IPPROTO_IPIP;
-	if (ip_route_output_key(dev_net(skb->dev), &rt, &key)) {
+	if (ip_route_output_key(dev_net(skb->dev), &rt, &fl)) {
 		kfree_skb(skb2);
 		return 0;
 	}
@@ -427,7 +429,7 @@ out:
 	if (rt->rt_flags&RTCF_LOCAL) {
 		ip_rt_put(rt);
 		rt = NULL;
-		fl.fl4_daddr = eiph->daddr;
+		fl.fl4_dst = eiph->daddr;
 		fl.fl4_src = eiph->saddr;
 		fl.fl4_tos = eiph->tos;
 		if (ip_route_output_key(dev_net(skb->dev), &rt, &fl) ||
diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index 5a6fab9..c347c67 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -463,7 +463,7 @@ out:
 	read_unlock(&ipip6_lock);
 	return err;
 #else
-	struct iphdr *iph = (struct iphdr*)dp;
+	struct iphdr *iph = (struct iphdr*)skb->data;
 	int hlen = iph->ihl<<2;
 	struct ipv6hdr *iph6;
 	const int type = icmp_hdr(skb)->type;
@@ -473,17 +473,19 @@ out:
 	int rel_info = 0;
 	struct sk_buff *skb2;
 	struct rt6_info *rt6i;
-
+	
+	int len = skb->len;
+	
 	if (len < hlen + sizeof(struct ipv6hdr))
-		return;
-	iph6 = (struct ipv6hdr*)(dp + hlen);
+		return 0;
+	iph6 = (struct ipv6hdr*)(skb->data + hlen);
 
 	switch (type) {
 	default:
-		return;
+		return 0;
 	case ICMP_PARAMETERPROB:
 		if (icmp_hdr(skb)->un.gateway < hlen)
-			return;
+			return 0;
 
 		/* So... This guy found something strange INSIDE encapsulated
 		   packet. Well, he is fool, but what can we do ?
@@ -497,10 +499,10 @@ out:
 		case ICMP_SR_FAILED:
 		case ICMP_PORT_UNREACH:
 			/* Impossible event. */
-			return;
+			return 0;
 		case ICMP_FRAG_NEEDED:
 			/* Too complicated case ... */
-			return;
+			return 0;
 		default:
 			/* All others are translated to HOST_UNREACH.
 			   rfc2003 contains "deep thoughts" about NET_UNREACH,
@@ -513,7 +515,7 @@ out:
 		break;
 	case ICMP_TIME_EXCEEDED:
 		if (code != ICMP_EXC_TTL)
-			return;
+			return 0;
 		rel_type = ICMPV6_TIME_EXCEED;
 		rel_code = ICMPV6_EXC_HOPLIMIT;
 		break;