[RFC] Preliminary wccp support for ip_gre

[RFC] Preliminary wccp support for ip_gre

[Paul P Komkoff Jr]

Please, can you give a comments on this piece of code?

I haven't attached any turning knobs to it but I will do so when I'll
figure out what knobs and how :)


diff -urN linux-2.6.6-1.435/net/ipv4/ip_gre.c linux-2.6.6-1.435a/net/ipv4/ip_gre.c
--- linux-2.6.6-1.435/net/ipv4/ip_gre.c	2004-05-10 06:32:54.000000000 +0400
+++ linux-2.6.6-1.435a/net/ipv4/ip_gre.c	2004-06-30 16:38:43.781838344 +0400
@@ -553,6 +553,8 @@
 	return INET_ECN_encapsulate(tos, inner);
 }
 
+#define ETH_P_WCCP 0x883E
+
 int ipgre_rcv(struct sk_buff *skb)
 {
 	struct iphdr *iph;
@@ -605,13 +607,21 @@
 	if ((tunnel = ipgre_tunnel_lookup(iph->saddr, iph->daddr, key)) != NULL) {
 		secpath_reset(skb);
 
+		skb->protocol = *(u16*)(h + 2);
+		if (1) {
+			if ((flags == 0) && (skb->protocol == __constant_htons(ETH_P_WCCP))) {
+				skb->protocol = __constant_htons(ETH_P_IP);
+				if ((*(h + offset) & 0xF0) != 0x40) 
+					offset += 4;
+			}
+		}
+
 		skb->mac.raw = skb->nh.raw;
 		skb->nh.raw = __pskb_pull(skb, offset);
 		memset(&(IPCB(skb)->opt), 0, sizeof(struct ip_options));
 		if (skb->ip_summed == CHECKSUM_HW)
 			skb->csum = csum_sub(skb->csum,
 					     csum_partial(skb->mac.raw, skb->nh.raw-skb->mac.raw, 0));
-		skb->protocol = *(u16*)(h + 2);
 		skb->pkt_type = PACKET_HOST;
 #ifdef CONFIG_NET_IPGRE_BROADCAST
 		if (MULTICAST(iph->daddr)) {


-- 
Paul P 'Stingray' Komkoff Jr // http://stingr.net/key <- my pgp key
 This message represents the official view of the voices in my head