[B.A.T.M.A.N.] [PATCH 8/8] batman-adv: add gateway IPv6 support by filtering DHCPv6 messages

Signed-off-by: Marek Lindner &lt;lindner_marek(a)yahoo.de&gt; --- batman-adv/gateway_client.c | 40 +++++++++++++++++++++++++++++++--------- 1 files changed, 31 insertions(+), 9 deletions(-) diff --git a/batman-adv/gateway_client.c b/batman-adv/gateway_client.c index e6cd9ac..128f851 100644 --- a/batman-adv/gateway_client.c +++ b/batman-adv/gateway_client.c @@ -25,6 +25,7 @@ #include "hard-interface.h" #include "compat.h" #include <linux/ip.h> +#include <linux/ipv6.h> #include <linux/udp.h> #include <linux/if_vlan.h> @@ -404,6 +405,7 @@ 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; @@ -425,17 +427,32 @@ 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; + + 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 (iphdr->protocol != IPPROTO_UDP) + /* 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; @@ -443,7 +460,12 @@ 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) -- 1.7.1