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

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>

1 files changed, 49 insertions, 0 deletions

diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h
index d32825585500..5d6313d972fc 100644
--- a/include/net/ip_vs.h
+++ b/include/net/ip_vs.h
@@ -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>