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IPVS: Add general v4/v6 helper functions / data structures

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Add a struct ip_vs_iphdr for easier handling of common v4 and v6 header
fields in the same code path. ip_vs_fill_iphdr() helps to fill this struct
from an IPv4 or IPv6 header. Add further helper functions for copying and
comparing addresses.

Signed-off-by: Julius Volz <juliusv@google.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
This commit is contained in:
Julius Volz 2008-09-02 15:55:34 +02:00 committed by Simon Horman
parent e7ade46a53
commit 64aae3cb9f
1 changed files with 49 additions and 0 deletions
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49
include/net/ip_vs.h
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@ -25,6 +25,55 @@
#include <linux/ipv6.h> /* for struct ipv6hdr */
#include <net/ipv6.h> /* for ipv6_addr_copy */
struct ip_vs_iphdr {
int len;
__u8 protocol;
union nf_inet_addr saddr;
union nf_inet_addr daddr;
};
static inline void
ip_vs_fill_iphdr(int af, const void *nh, struct ip_vs_iphdr *iphdr)
{
#ifdef CONFIG_IP_VS_IPV6
if (af == AF_INET6) {
const struct ipv6hdr *iph = nh;
iphdr->len = sizeof(struct ipv6hdr);
iphdr->protocol = iph->nexthdr;
ipv6_addr_copy(&iphdr->saddr.in6, &iph->saddr);
ipv6_addr_copy(&iphdr->daddr.in6, &iph->daddr);
} else
#endif
{
const struct iphdr *iph = nh;
iphdr->len = iph->ihl * 4;
iphdr->protocol = iph->protocol;
iphdr->saddr.ip = iph->saddr;
iphdr->daddr.ip = iph->daddr;
}
}
static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
const union nf_inet_addr *src)
{
#ifdef CONFIG_IP_VS_IPV6
if (af == AF_INET6)
ipv6_addr_copy(&dst->in6, &src->in6);
else
#endif
dst->ip = src->ip;
}
static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
const union nf_inet_addr *b)
{
#ifdef CONFIG_IP_VS_IPV6
if (af == AF_INET6)
return ipv6_addr_equal(&a->in6, &b->in6);
#endif
return a->ip == b->ip;
}
#ifdef CONFIG_IP_VS_DEBUG
#include <linux/net.h>