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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@xxxxxxxxxx>
1 files changed, 50 insertions(+), 0 deletions(-)
diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h
index e41a164..016af19 100644
--- a/include/net/ip_vs.h
+++ b/include/net/ip_vs.h
@@ -25,6 +25,56 @@
#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
+ return (af == AF_INET) ? (a->ip == b->ip)
+ : ipv6_addr_equal(&a->in6, &b->in6);
+#else
+ return a->ip == b->ip;
+#endif
+}
+
#ifdef CONFIG_IP_VS_DEBUG
#include <linux/net.h>
--
1.5.4.5
--
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