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Staging: batman-adv: add gateway IPv6 support by filtering DHCPv6 messages 

Some additional checks will be needed in case of extension headers
like the fragmentation or hop-by-hop (for jumbo frames for example)
headers or ipsec stuff. But this patch should do for most people
for now, the rest can be added with a later one.

Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Acked-by: Linus Lüssing <linus.luessing@web.de>
Signed-off-by: Sven Eckelmann <sven.eckelmann@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Marek Lindner 2010-11-22 00:56:05 +01:00 committed by Greg Kroah-Hartman
parent c9c556b63b
commit 003db3b2ad
1 changed files with 31 additions and 9 deletions
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40
drivers/staging/batman-adv/gateway_client.c
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@ -24,6 +24,7 @@
#include "gateway_common.h"
#include "hard-interface.h"
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/udp.h>
#include <linux/if_vlan.h>
@ -403,6 +404,7 @@ int gw_is_target(struct bat_priv *bat_priv, struct sk_buff *skb)
{
struct ethhdr *ethhdr;
struct iphdr *iphdr;
struct ipv6hdr *ipv6hdr;
struct udphdr *udphdr;
unsigned int header_len = 0;
@ -424,17 +426,32 @@ int gw_is_target(struct bat_priv *bat_priv, struct sk_buff *skb)
}
/* check for ip header */
if (ntohs(ethhdr->h_proto) != ETH_P_IP)
return 0;
switch (ntohs(ethhdr->h_proto)) {
case ETH_P_IP:
if (!pskb_may_pull(skb, header_len + sizeof(struct iphdr)))
return 0;
iphdr = (struct iphdr *)(skb->data + header_len);
header_len += iphdr->ihl * 4;
if (!pskb_may_pull(skb, header_len + sizeof(struct iphdr)))
return 0;
iphdr = (struct iphdr *)(skb->data + header_len);
header_len += iphdr->ihl * 4;
/* check for udp header */
if (iphdr->protocol != IPPROTO_UDP)
return 0;
/* check for udp header */
if (iphdr->protocol != IPPROTO_UDP)
break;
case ETH_P_IPV6:
if (!pskb_may_pull(skb, header_len + sizeof(struct ipv6hdr)))
return 0;
ipv6hdr = (struct ipv6hdr *)(skb->data + header_len);
header_len += sizeof(struct ipv6hdr);
/* check for udp header */
if (ipv6hdr->nexthdr != IPPROTO_UDP)
return 0;
break;
default:
return 0;
}
if (!pskb_may_pull(skb, header_len + sizeof(struct udphdr)))
return 0;
@ -442,7 +459,12 @@ int gw_is_target(struct bat_priv *bat_priv, struct sk_buff *skb)
header_len += sizeof(struct udphdr);
/* check for bootp port */
if (ntohs(udphdr->dest) != 67)
if ((ntohs(ethhdr->h_proto) == ETH_P_IP) &&
(ntohs(udphdr->dest) != 67))
return 0;
if ((ntohs(ethhdr->h_proto) == ETH_P_IPV6) &&
(ntohs(udphdr->dest) != 547))
return 0;
if (atomic_read(&bat_priv->gw_mode) == GW_MODE_SERVER)