Obviously I'm doing something wrong...My UDP port
numbers look all wrong (I took at them raw and ran them
through ntohs to see if anything looked right)
*They're a type __be16 -- which is network byte order?)
BTW, the IP addresses look fine, I wrote my own inet_ntoa_r...
I'm running wireshark alongside my module to see if I can get it to agree..
Here's my code:
static unsigned int main_hook(unsigned int hooknum,
struct sk_buff **skb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff*))
{
struct sk_buff *sock_buff;
struct udphdr *udp_header;
struct iphdr *ip_header;
char address1[20];
char address2[20];
sock_buff = *skb;
if(!sock_buff)
return NF_ACCEPT;
ip_header = ip_hdr(sock_buff);
if(ip_header->protocol != IPPROTO_UDP)
return NF_ACCEPT;
udp_header = udp_hdr(sock_buff);
printk("udp source = %s dest %s\n", inet_ntoa_r(*(struct in_addr *) &ip_header->saddr, address1),
inet_ntoa_r(*(struct in_addr *) &ip_header->daddr, address2));
printk("udp packet = source port = %d, dest port = %d\n",ntohs(udp_header->source),
ntohs(udp_header->dest));
printk("no ntohs: udp packet = source port = %, dest port = %d\n",udp_header->source,
udp_header->dest);
return NF_ACCEPT;
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