udhcp6: read_interface should save link-local ipv6 address

Patch is based on work by tiggerswelt.net. They say:
"Using this patch it was no problem to acquire an IPv6-Address via DHCPv6
using ISC DHCPD6 on server-side."

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/networking/udhcp/d6_common.h b/networking/udhcp/d6_common.h
index eb211ea0f..f7cfa4ab8 100644
--- a/networking/udhcp/d6_common.h
+++ b/networking/udhcp/d6_common.h
@@ -91,10 +91,14 @@ struct client6_data_t {
         struct d6_option *ia_na;
         char **env_ptr;
         unsigned env_idx;
+        /* link-local IPv6 address */
+        struct in6_addr ll_ip6;
 };
 
 #define client6_data (*(struct client6_data_t*)(&bb_common_bufsiz1[COMMON_BUFSIZE - sizeof(struct client6_data_t)]))
 
+int FAST_FUNC d6_read_interface(const char *interface, int *ifindex, struct in6_addr *nip6, uint8_t *mac);
+
 int FAST_FUNC d6_listen_socket(int port, const char *inf);
 
 int FAST_FUNC d6_recv_kernel_packet(