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#ifndef _IP_SET_GETPORT_H
#define _IP_SET_GETPORT_H
#ifdef __KERNEL__
#include <linux/netfilter_ipv6/ip6_tables.h>
#include <net/ip.h>
#define IPSET_INVALID_PORT 65536
/* We must handle non-linear skbs */
static inline bool
get_port(const struct sk_buff *skb, int protocol, unsigned int protooff,
bool src, u16 *port, u8 *proto)
{
switch (protocol) {
case IPPROTO_TCP: {
struct tcphdr _tcph;
const struct tcphdr *th;
th = skb_header_pointer(skb, protooff, sizeof(_tcph), &_tcph);
if (th == NULL)
/* No choice either */
return false;
*port = src ? th->source : th->dest;
break;
}
case IPPROTO_UDP: {
struct udphdr _udph;
const struct udphdr *uh;
uh = skb_header_pointer(skb, protooff, sizeof(_udph), &_udph);
if (uh == NULL)
/* No choice either */
return false;
*port = src ? uh->source : uh->dest;
break;
}
default:
if (*proto == IPSET_IPPROTO_TCPUDP)
return false;
break;
}
if (*proto != IPSET_IPPROTO_TCPUDP)
*proto = protocol;
return true;
}
static inline bool
get_ip4_port(const struct sk_buff *skb, bool src, u16 *port, u8 *proto)
{
const struct iphdr *iph = ip_hdr(skb);
unsigned int protooff = ip_hdrlen(skb);
int protocol = iph->protocol;
if (!(*proto >= IPSET_IPPROTO_TCPUDP || *proto == protocol))
return false;
/* See comments at tcp_match in ip_tables.c */
if (ntohs(iph->frag_off) & IP_OFFSET)
return false;
return get_port(skb, protocol, protooff, src, port, proto);
}
static inline bool
get_ip6_port(const struct sk_buff *skb, bool src, u16 *port, u8 *proto)
{
unsigned int protooff = 0;
int protocol;
unsigned short fragoff;
protocol = ipv6_find_hdr(skb, &protooff, -1, &fragoff);
if (protocol < 0 || fragoff)
return false;
if (!(*proto >= IPSET_IPPROTO_TCPUDP || *proto == protocol))
return false;
return get_port(skb, protocol, protooff, src, port, proto);
}
static inline bool
get_ip_port(const struct sk_buff *skb, u8 pf, bool src, u16 *port)
{
u8 proto = IPSET_IPPROTO_TCPUDP;
if (pf == AF_INET)
return get_ip4_port(skb, src, port, &proto);
else
return get_ip6_port(skb, src, port, &proto);
}
#endif /* __KERNEL__ */
#endif /*_IP_SET_GETPORT_H*/
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