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#ifndef _IP_SET_GETPORT_H
#define _IP_SET_GETPORT_H
#ifdef __KERNEL__
#define INVALID_PORT (MAX_RANGE + 1)
/* We must handle non-linear skbs */
static inline ip_set_ip_t
get_port(const struct sk_buff *skb, u_int32_t flags)
{
struct iphdr *iph = ip_hdr(skb);
u_int16_t offset = ntohs(iph->frag_off) & IP_OFFSET;
switch (iph->protocol) {
case IPPROTO_TCP: {
struct tcphdr tcph;
/* See comments at tcp_match in ip_tables.c */
if (offset)
return INVALID_PORT;
if (skb_copy_bits(skb, ip_hdr(skb)->ihl*4, &tcph, sizeof(tcph)) < 0)
/* No choice either */
return INVALID_PORT;
return ntohs(flags & IPSET_SRC ?
tcph.source : tcph.dest);
}
case IPPROTO_UDP: {
struct udphdr udph;
if (offset)
return INVALID_PORT;
if (skb_copy_bits(skb, ip_hdr(skb)->ihl*4, &udph, sizeof(udph)) < 0)
/* No choice either */
return INVALID_PORT;
return ntohs(flags & IPSET_SRC ?
udph.source : udph.dest);
}
default:
return INVALID_PORT;
}
}
#endif /* __KERNEL__ */
#endif /*_IP_SET_GETPORT_H*/
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