This was added in commit 818f1f3e7 "ipv6: add ipv6_addr_prefix_copy" to
mainline Linux kernel.
Signed-off-by: Hauke Mehrtens <hauke@xxxxxxxxxx>
---
backport/backport-include/net/ipv6.h | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/backport/backport-include/net/ipv6.h b/backport/backport-include/net/ipv6.h
index 9da13eb..762ad78 100644
--- a/backport/backport-include/net/ipv6.h
+++ b/backport/backport-include/net/ipv6.h
@@ -39,4 +39,22 @@ static inline u32 ipv6_addr_hash(const struct in6_addr *a)
}
#endif
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,5,0)
+#define ipv6_addr_prefix_copy LINUX_BACKPORT(ipv6_addr_prefix_copy)
+static inline void ipv6_addr_prefix_copy(struct in6_addr *addr,
+ const struct in6_addr *pfx,
+ int plen)
+{
+ /* caller must guarantee 0 <= plen <= 128 */
+ int o = plen >> 3,
+ b = plen & 0x7;
+
+ memcpy(addr->s6_addr, pfx, o);
+ if (b != 0) {
+ addr->s6_addr[o] &= ~(0xff00 >> b);
+ addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b));
+ }
+}
+#endif
+
#endif /* __BACKPORT_NET_IPV6_H */
--
2.8.1
--
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