From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Michael Chang <mchang@suse.com>
Date: Wed, 10 Jul 2019 15:42:36 +0200
Subject: [PATCH] bootp: New net_bootp6 command

Implement new net_bootp6 command for IPv6 network auto configuration via the
DHCPv6 protocol (RFC3315).

Signed-off-by: Michael Chang <mchang@suse.com>
Signed-off-by: Ken Lin <ken.lin@hpe.com>
[pjones: Put back our code to add a local route]
Signed-off-by: Peter Jones <pjones@redhat.com>
---
 grub-core/net/bootp.c              | 1059 ++++++++++++++++++++++++++++++------
 grub-core/net/drivers/efi/efinet.c |   20 +-
 grub-core/net/ip.c                 |   39 ++
 include/grub/efi/api.h             |    2 +-
 include/grub/net.h                 |   91 ++--
 5 files changed, 1002 insertions(+), 209 deletions(-)

diff --git a/grub-core/net/bootp.c b/grub-core/net/bootp.c
index 08b6b2b5d6c..fe93b80f1cf 100644
--- a/grub-core/net/bootp.c
+++ b/grub-core/net/bootp.c
@@ -24,6 +24,98 @@
 #include <grub/net/netbuff.h>
 #include <grub/net/udp.h>
 #include <grub/datetime.h>
+#include <grub/time.h>
+#include <grub/list.h>
+
+static int
+dissect_url (const char *url, char **proto, char **host, char **path)
+{
+  const char *p, *ps;
+  grub_size_t l;
+
+  *proto = *host = *path = NULL;
+  ps = p = url;
+
+  while ((p = grub_strchr (p, ':')))
+    {
+      if (grub_strlen (p) < sizeof ("://") - 1)
+	break;
+      if (grub_memcmp (p, "://", sizeof ("://") - 1) == 0)
+	{
+	  l = p - ps;
+	  *proto = grub_malloc (l + 1);
+	  if (!*proto)
+	    {
+	      grub_print_error ();
+	      return 0;
+	    }
+
+	  grub_memcpy (*proto, ps, l);
+	  (*proto)[l] = '\0';
+	  p +=  sizeof ("://") - 1;
+	  break;
+	}
+      ++p;
+    }
+
+  if (!*proto)
+    {
+      grub_dprintf ("bootp", "url: %s is not valid, protocol not found\n", url);
+      return 0;
+    }
+
+  ps = p;
+  p = grub_strchr (p, '/');
+
+  if (!p)
+    {
+      grub_dprintf ("bootp", "url: %s is not valid, host/path not found\n", url);
+      grub_free (*proto);
+      *proto = NULL;
+      return 0;
+    }
+
+  l = p - ps;
+
+  if (l > 2 && ps[0] == '[' && ps[l - 1] == ']')
+    {
+      *host = grub_malloc (l - 1);
+      if (!*host)
+	{
+	  grub_print_error ();
+	  grub_free (*proto);
+	  *proto = NULL;
+	  return 0;
+	}
+      grub_memcpy (*host, ps + 1, l - 2);
+      (*host)[l - 2] = 0;
+    }
+  else
+    {
+      *host = grub_malloc (l + 1);
+      if (!*host)
+	{
+	  grub_print_error ();
+	  grub_free (*proto);
+	  *proto = NULL;
+	  return 0;
+	}
+      grub_memcpy (*host, ps, l);
+      (*host)[l] = 0;
+    }
+
+  *path = grub_strdup (p);
+  if (!*path)
+    {
+      grub_print_error ();
+      grub_free (*host);
+      grub_free (*proto);
+      *host = NULL;
+      *proto = NULL;
+      return 0;
+    }
+  return 1;
+}
 
 struct grub_dhcp_discover_options
 {
@@ -604,6 +696,584 @@ out:
   return err;
 }
 
+/* The default netbuff size for sending DHCPv6 packets which should be
+   large enough to hold the information */
+#define GRUB_DHCP6_DEFAULT_NETBUFF_ALLOC_SIZE 512
+
+struct grub_dhcp6_options
+{
+  grub_uint8_t *client_duid;
+  grub_uint16_t client_duid_len;
+  grub_uint8_t *server_duid;
+  grub_uint16_t server_duid_len;
+  grub_uint32_t iaid;
+  grub_uint32_t t1;
+  grub_uint32_t t2;
+  grub_net_network_level_address_t *ia_addr;
+  grub_uint32_t preferred_lifetime;
+  grub_uint32_t valid_lifetime;
+  grub_net_network_level_address_t *dns_server_addrs;
+  grub_uint16_t num_dns_server;
+  char *boot_file_proto;
+  char *boot_file_server_ip;
+  char *boot_file_path;
+};
+
+typedef struct grub_dhcp6_options *grub_dhcp6_options_t;
+
+struct grub_dhcp6_session
+{
+  struct grub_dhcp6_session *next;
+  struct grub_dhcp6_session **prev;
+  grub_uint32_t iaid;
+  grub_uint32_t transaction_id:24;
+  grub_uint64_t start_time;
+  struct grub_net_dhcp6_option_duid_ll duid;
+  struct grub_net_network_level_interface *iface;
+
+  /* The associated dhcpv6 options */
+  grub_dhcp6_options_t adv;
+  grub_dhcp6_options_t reply;
+};
+
+typedef struct grub_dhcp6_session *grub_dhcp6_session_t;
+
+typedef void (*dhcp6_option_hook_fn) (const struct grub_net_dhcp6_option *opt, void *data);
+
+static void
+foreach_dhcp6_option (const struct grub_net_dhcp6_option *opt, grub_size_t size,
+		      dhcp6_option_hook_fn hook, void *hook_data);
+
+static void
+parse_dhcp6_iaaddr (const struct grub_net_dhcp6_option *opt, void *data)
+{
+  grub_dhcp6_options_t dhcp6 = (grub_dhcp6_options_t )data;
+
+  grub_uint16_t code = grub_be_to_cpu16 (opt->code);
+  grub_uint16_t len = grub_be_to_cpu16 (opt->len);
+
+  if (code == GRUB_NET_DHCP6_OPTION_IAADDR)
+    {
+      const struct grub_net_dhcp6_option_iaaddr *iaaddr;
+      iaaddr = (const struct grub_net_dhcp6_option_iaaddr *)opt->data;
+
+      if (len < sizeof (*iaaddr))
+	{
+	  grub_dprintf ("bootp", "DHCPv6: code %u with insufficient length %u\n", code, len);
+	  return;
+	}
+      if (!dhcp6->ia_addr)
+	{
+	  dhcp6->ia_addr = grub_malloc (sizeof(*dhcp6->ia_addr));
+	  dhcp6->ia_addr->type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV6;
+	  dhcp6->ia_addr->ipv6[0] = grub_get_unaligned64 (iaaddr->addr);
+	  dhcp6->ia_addr->ipv6[1] = grub_get_unaligned64 (iaaddr->addr + 8);
+	  dhcp6->preferred_lifetime = grub_be_to_cpu32 (iaaddr->preferred_lifetime);
+	  dhcp6->valid_lifetime = grub_be_to_cpu32 (iaaddr->valid_lifetime);
+	}
+    }
+}
+
+static void
+parse_dhcp6_option (const struct grub_net_dhcp6_option *opt, void *data)
+{
+  grub_dhcp6_options_t dhcp6 = (grub_dhcp6_options_t)data;
+  grub_uint16_t code = grub_be_to_cpu16 (opt->code);
+  grub_uint16_t len = grub_be_to_cpu16 (opt->len);
+
+  switch (code)
+    {
+      case GRUB_NET_DHCP6_OPTION_CLIENTID:
+
+	if (dhcp6->client_duid || !len)
+	  {
+	    grub_dprintf ("bootp", "Skipped DHCPv6 CLIENTID with length %u\n", len);
+	    break;
+	  }
+	dhcp6->client_duid = grub_malloc (len);
+	grub_memcpy (dhcp6->client_duid, opt->data, len);
+	dhcp6->client_duid_len = len;
+	break;
+
+      case GRUB_NET_DHCP6_OPTION_SERVERID:
+
+	if (dhcp6->server_duid || !len)
+	  {
+	    grub_dprintf ("bootp", "Skipped DHCPv6 SERVERID with length %u\n", len);
+	    break;
+	  }
+	dhcp6->server_duid = grub_malloc (len);
+	grub_memcpy (dhcp6->server_duid, opt->data, len);
+	dhcp6->server_duid_len = len;
+	break;
+
+      case GRUB_NET_DHCP6_OPTION_IA_NA:
+	{
+	  const struct grub_net_dhcp6_option_iana *ia_na;
+	  grub_uint16_t data_len;
+
+	  if (dhcp6->iaid || len < sizeof (*ia_na))
+	    {
+	      grub_dprintf ("bootp", "Skipped DHCPv6 IA_NA with length %u\n", len);
+	      break;
+	    }
+	  ia_na = (const struct grub_net_dhcp6_option_iana *)opt->data;
+	  dhcp6->iaid = grub_be_to_cpu32 (ia_na->iaid);
+	  dhcp6->t1 = grub_be_to_cpu32 (ia_na->t1);
+	  dhcp6->t2 = grub_be_to_cpu32 (ia_na->t2);
+
+	  data_len = len - sizeof (*ia_na);
+	  if (data_len)
+	    foreach_dhcp6_option ((const struct grub_net_dhcp6_option *)ia_na->data, data_len, parse_dhcp6_iaaddr, dhcp6);
+	}
+	break;
+
+      case GRUB_NET_DHCP6_OPTION_DNS_SERVERS:
+	{
+	  const grub_uint8_t *po;
+	  grub_uint16_t ln;
+	  grub_net_network_level_address_t *la;
+
+	  if (!len || len & 0xf)
+	    {
+	      grub_dprintf ("bootp", "Skip invalid length DHCPv6 DNS_SERVERS \n");
+	      break;
+	    }
+	  dhcp6->num_dns_server = ln = len >> 4;
+	  dhcp6->dns_server_addrs = la = grub_zalloc (ln * sizeof (*la));
+
+	  for (po = opt->data; ln > 0; po += 0x10, la++, ln--)
+	    {
+	      la->type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV6;
+	      la->ipv6[0] = grub_get_unaligned64 (po);
+	      la->ipv6[1] = grub_get_unaligned64 (po + 8);
+	      la->option = DNS_OPTION_PREFER_IPV6;
+	    }
+	}
+	break;
+
+      case GRUB_NET_DHCP6_OPTION_BOOTFILE_URL:
+	dissect_url ((const char *)opt->data,
+		      &dhcp6->boot_file_proto,
+		      &dhcp6->boot_file_server_ip,
+		      &dhcp6->boot_file_path);
+	break;
+
+      default:
+	break;
+    }
+}
+
+static void
+foreach_dhcp6_option (const struct grub_net_dhcp6_option *opt, grub_size_t size, dhcp6_option_hook_fn hook, void *hook_data)
+{
+  while (size)
+    {
+      grub_uint16_t code, len;
+
+      if (size < sizeof (*opt))
+	{
+	  grub_dprintf ("bootp", "DHCPv6: Options stopped with remaining size %" PRIxGRUB_SIZE "\n", size);
+	  break;
+	}
+      size -= sizeof (*opt);
+      len = grub_be_to_cpu16 (opt->len);
+      code = grub_be_to_cpu16 (opt->code);
+      if (size < len)
+	{
+	  grub_dprintf ("bootp", "DHCPv6: Options stopped at out of bound length %u for option %u\n", len, code);
+	  break;
+	}
+      if (!len)
+	{
+	  grub_dprintf ("bootp", "DHCPv6: Options stopped at zero length option %u\n", code);
+	  break;
+	}
+      else
+	{
+	  if (hook)
+	    hook (opt, hook_data);
+	  size -= len;
+	  opt = (const struct grub_net_dhcp6_option *)((grub_uint8_t *)opt + len + sizeof (*opt));
+	}
+    }
+}
+
+static grub_dhcp6_options_t
+grub_dhcp6_options_get (const struct grub_net_dhcp6_packet *v6h,
+			grub_size_t size)
+{
+  grub_dhcp6_options_t options;
+
+  if (size < sizeof (*v6h))
+    {
+      grub_error (GRUB_ERR_OUT_OF_RANGE, N_("DHCPv6 packet size too small"));
+      return NULL;
+    }
+
+  options = grub_zalloc (sizeof(*options));
+  if (!options)
+    return NULL;
+
+  foreach_dhcp6_option ((const struct grub_net_dhcp6_option *)v6h->dhcp_options,
+		       size - sizeof (*v6h), parse_dhcp6_option, options);
+
+  return options;
+}
+
+static void
+grub_dhcp6_options_free (grub_dhcp6_options_t options)
+{
+  if (options->client_duid)
+    grub_free (options->client_duid);
+  if (options->server_duid)
+    grub_free (options->server_duid);
+  if (options->ia_addr)
+    grub_free (options->ia_addr);
+  if (options->dns_server_addrs)
+    grub_free (options->dns_server_addrs);
+  if (options->boot_file_proto)
+    grub_free (options->boot_file_proto);
+  if (options->boot_file_server_ip)
+    grub_free (options->boot_file_server_ip);
+  if (options->boot_file_path)
+    grub_free (options->boot_file_path);
+
+  grub_free (options);
+}
+
+static grub_dhcp6_session_t grub_dhcp6_sessions;
+#define FOR_DHCP6_SESSIONS_SAFE(var, next) FOR_LIST_ELEMENTS_SAFE (var, next, grub_dhcp6_sessions)
+#define FOR_DHCP6_SESSIONS(var) FOR_LIST_ELEMENTS (var, grub_dhcp6_sessions)
+
+static void
+grub_net_configure_by_dhcp6_info (const char *name,
+	  struct grub_net_card *card,
+	  grub_dhcp6_options_t dhcp6,
+	  int is_def,
+	  int flags,
+	  struct grub_net_network_level_interface **ret_inf)
+{
+  grub_net_network_level_netaddress_t netaddr;
+  struct grub_net_network_level_interface *inf;
+
+  if (dhcp6->ia_addr)
+    {
+      inf = grub_net_add_addr (name, card, dhcp6->ia_addr, &card->default_address, flags);
+
+      netaddr.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV6;
+      netaddr.ipv6.base[0] = dhcp6->ia_addr->ipv6[0];
+      netaddr.ipv6.base[1] = 0;
+      netaddr.ipv6.masksize = 64;
+      grub_net_add_route (name, netaddr, inf);
+
+      if (ret_inf)
+	*ret_inf = inf;
+    }
+
+  if (dhcp6->dns_server_addrs)
+    {
+      grub_uint16_t i;
+
+      for (i = 0; i < dhcp6->num_dns_server; ++i)
+	grub_net_add_dns_server (dhcp6->dns_server_addrs + i);
+    }
+
+  if (dhcp6->boot_file_path)
+    grub_env_set_net_property (name, "boot_file", dhcp6->boot_file_path,
+			  grub_strlen (dhcp6->boot_file_path));
+
+  if (is_def && dhcp6->boot_file_server_ip)
+    {
+      grub_net_default_server = grub_strdup (dhcp6->boot_file_server_ip);
+      grub_env_set ("net_default_interface", name);
+      grub_env_export ("net_default_interface");
+    }
+}
+
+static void
+grub_dhcp6_session_add (struct grub_net_network_level_interface *iface,
+			grub_uint32_t iaid)
+{
+  grub_dhcp6_session_t se;
+  struct grub_datetime date;
+  grub_err_t err;
+  grub_int32_t t = 0;
+
+  se = grub_malloc (sizeof (*se));
+
+  err = grub_get_datetime (&date);
+  if (err || !grub_datetime2unixtime (&date, &t))
+    {
+      grub_errno = GRUB_ERR_NONE;
+      t = 0;
+    }
+
+  se->iface = iface;
+  se->iaid = iaid;
+  se->transaction_id = t;
+  se->start_time = grub_get_time_ms ();
+  se->duid.type = grub_cpu_to_be16_compile_time (3) ;
+  se->duid.hw_type = grub_cpu_to_be16_compile_time (1);
+  grub_memcpy (&se->duid.hwaddr, &iface->hwaddress.mac, sizeof (se->duid.hwaddr));
+  se->adv = NULL;
+  se->reply = NULL;
+  grub_list_push (GRUB_AS_LIST_P (&grub_dhcp6_sessions), GRUB_AS_LIST (se));
+}
+
+static void
+grub_dhcp6_session_remove (grub_dhcp6_session_t se)
+{
+  grub_list_remove (GRUB_AS_LIST (se));
+  if (se->adv)
+    grub_dhcp6_options_free (se->adv);
+  if (se->reply)
+    grub_dhcp6_options_free (se->reply);
+  grub_free (se);
+}
+
+static void
+grub_dhcp6_session_remove_all (void)
+{
+  grub_dhcp6_session_t se, next;
+
+  FOR_DHCP6_SESSIONS_SAFE (se, next)
+    {
+      grub_dhcp6_session_remove (se);
+    }
+  grub_dhcp6_sessions = NULL;
+}
+
+static grub_err_t
+grub_dhcp6_session_configure_network (grub_dhcp6_session_t se)
+{
+  char *name;
+
+  name = grub_xasprintf ("%s:dhcp6", se->iface->card->name);
+  if (!name)
+    return grub_errno;
+
+  grub_net_configure_by_dhcp6_info (name, se->iface->card, se->reply, 1, 0, 0);
+  grub_free (name);
+
+  return GRUB_ERR_NONE;
+}
+
+static grub_err_t
+grub_dhcp6_session_send_request (grub_dhcp6_session_t se)
+{
+  struct grub_net_buff *nb;
+  struct grub_net_dhcp6_option *opt;
+  struct grub_net_dhcp6_packet *v6h;
+  struct grub_net_dhcp6_option_iana *ia_na;
+  struct grub_net_dhcp6_option_iaaddr *iaaddr;
+  struct udphdr *udph;
+  grub_net_network_level_address_t multicast;
+  grub_net_link_level_address_t ll_multicast;
+  grub_uint64_t elapsed;
+  struct grub_net_network_level_interface *inf = se->iface;
+  grub_dhcp6_options_t dhcp6 = se->adv;
+  grub_err_t err = GRUB_ERR_NONE;
+
+  multicast.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV6;
+  multicast.ipv6[0] = grub_cpu_to_be64_compile_time (0xff02ULL << 48);
+  multicast.ipv6[1] = grub_cpu_to_be64_compile_time (0x10002ULL);
+
+  err = grub_net_link_layer_resolve (inf, &multicast, &ll_multicast);
+  if (err)
+    return err;
+
+  nb = grub_netbuff_alloc (GRUB_DHCP6_DEFAULT_NETBUFF_ALLOC_SIZE);
+
+  if (!nb)
+    return grub_errno;
+
+  err = grub_netbuff_reserve (nb, GRUB_DHCP6_DEFAULT_NETBUFF_ALLOC_SIZE);
+  if (err)
+    {
+      grub_netbuff_free (nb);
+      return err;
+    }
+
+  err = grub_netbuff_push (nb, dhcp6->client_duid_len + sizeof (*opt));
+  if (err)
+    {
+      grub_netbuff_free (nb);
+      return err;
+    }
+  opt = (struct grub_net_dhcp6_option *)nb->data;
+  opt->code = grub_cpu_to_be16_compile_time (GRUB_NET_DHCP6_OPTION_CLIENTID);
+  opt->len = grub_cpu_to_be16 (dhcp6->client_duid_len);
+  grub_memcpy (opt->data, dhcp6->client_duid , dhcp6->client_duid_len);
+
+  err = grub_netbuff_push (nb, dhcp6->server_duid_len + sizeof (*opt));
+  if (err)
+    {
+      grub_netbuff_free (nb);
+      return err;
+    }
+  opt = (struct grub_net_dhcp6_option *)nb->data;
+  opt->code = grub_cpu_to_be16_compile_time (GRUB_NET_DHCP6_OPTION_SERVERID);
+  opt->len = grub_cpu_to_be16 (dhcp6->server_duid_len);
+  grub_memcpy (opt->data, dhcp6->server_duid , dhcp6->server_duid_len);
+
+  err = grub_netbuff_push (nb, sizeof (*ia_na) + sizeof (*opt));
+  if (err)
+    {
+      grub_netbuff_free (nb);
+      return err;
+    }
+
+  if (dhcp6->ia_addr)
+    {
+      err = grub_netbuff_push (nb, sizeof(*iaaddr) + sizeof (*opt));
+      if (err)
+	{
+	  grub_netbuff_free (nb);
+	  return err;
+	}
+    }
+  opt = (struct grub_net_dhcp6_option *)nb->data;
+  opt->code = grub_cpu_to_be16_compile_time (GRUB_NET_DHCP6_OPTION_IA_NA);
+  opt->len = grub_cpu_to_be16 (sizeof (*ia_na));
+  if (dhcp6->ia_addr)
+    opt->len += grub_cpu_to_be16 (sizeof(*iaaddr) + sizeof (*opt));
+
+  ia_na = (struct grub_net_dhcp6_option_iana *)opt->data;
+  ia_na->iaid = grub_cpu_to_be32 (dhcp6->iaid);
+
+  ia_na->t1 = grub_cpu_to_be32 (dhcp6->t1);
+  ia_na->t2 = grub_cpu_to_be32 (dhcp6->t2);
+
+  if (dhcp6->ia_addr)
+    {
+      opt = (struct grub_net_dhcp6_option *)ia_na->data;
+      opt->code = grub_cpu_to_be16_compile_time (GRUB_NET_DHCP6_OPTION_IAADDR);
+      opt->len = grub_cpu_to_be16 (sizeof (*iaaddr));
+      iaaddr = (struct grub_net_dhcp6_option_iaaddr *)opt->data;
+      grub_set_unaligned64 (iaaddr->addr, dhcp6->ia_addr->ipv6[0]);
+      grub_set_unaligned64 (iaaddr->addr + 8, dhcp6->ia_addr->ipv6[1]);
+
+      iaaddr->preferred_lifetime = grub_cpu_to_be32 (dhcp6->preferred_lifetime);
+      iaaddr->valid_lifetime = grub_cpu_to_be32 (dhcp6->valid_lifetime);
+    }
+
+  err = grub_netbuff_push (nb, sizeof (*opt) + 2 * sizeof (grub_uint16_t));
+  if (err)
+    {
+      grub_netbuff_free (nb);
+      return err;
+    }
+
+  opt = (struct grub_net_dhcp6_option*) nb->data;
+  opt->code = grub_cpu_to_be16_compile_time (GRUB_NET_DHCP6_OPTION_ORO);
+  opt->len = grub_cpu_to_be16_compile_time (2 * sizeof (grub_uint16_t));
+  grub_set_unaligned16 (opt->data, grub_cpu_to_be16_compile_time (GRUB_NET_DHCP6_OPTION_BOOTFILE_URL));
+  grub_set_unaligned16 (opt->data + 2, grub_cpu_to_be16_compile_time (GRUB_NET_DHCP6_OPTION_DNS_SERVERS));
+
+  err = grub_netbuff_push (nb, sizeof (*opt) + sizeof (grub_uint16_t));
+  if (err)
+    {
+      grub_netbuff_free (nb);
+      return err;
+    }
+  opt = (struct grub_net_dhcp6_option*) nb->data;
+  opt->code = grub_cpu_to_be16_compile_time (GRUB_NET_DHCP6_OPTION_ELAPSED_TIME);
+  opt->len = grub_cpu_to_be16_compile_time (sizeof (grub_uint16_t));
+
+  /* the time is expressed in hundredths of a second */
+  elapsed = grub_divmod64 (grub_get_time_ms () - se->start_time, 10, 0);
+
+  if (elapsed > 0xffff)
+    elapsed = 0xffff;
+
+  grub_set_unaligned16 (opt->data,  grub_cpu_to_be16 ((grub_uint16_t)elapsed));
+
+  err = grub_netbuff_push (nb, sizeof (*v6h));
+  if (err)
+    {
+      grub_netbuff_free (nb);
+      return err;
+    }
+
+  v6h = (struct grub_net_dhcp6_packet *) nb->data;
+  v6h->message_type = GRUB_NET_DHCP6_REQUEST;
+  v6h->transaction_id = se->transaction_id;
+
+  err = grub_netbuff_push (nb, sizeof (*udph));
+  if (err)
+    {
+      grub_netbuff_free (nb);
+      return err;
+    }
+
+  udph = (struct udphdr *) nb->data;
+  udph->src = grub_cpu_to_be16_compile_time (DHCP6_CLIENT_PORT);
+  udph->dst = grub_cpu_to_be16_compile_time (DHCP6_SERVER_PORT);
+  udph->chksum = 0;
+  udph->len = grub_cpu_to_be16 (nb->tail - nb->data);
+
+  udph->chksum = grub_net_ip_transport_checksum (nb, GRUB_NET_IP_UDP,
+						 &inf->address,
+						 &multicast);
+  err = grub_net_send_ip_packet (inf, &multicast, &ll_multicast, nb,
+				 GRUB_NET_IP_UDP);
+
+  grub_netbuff_free (nb);
+
+  return err;
+}
+
+struct grub_net_network_level_interface *
+grub_net_configure_by_dhcpv6_reply (const char *name,
+	struct grub_net_card *card,
+	grub_net_interface_flags_t flags,
+	const struct grub_net_dhcp6_packet *v6h,
+	grub_size_t size,
+	int is_def,
+	char **device, char **path)
+{
+  struct grub_net_network_level_interface *inf;
+  grub_dhcp6_options_t dhcp6;
+  int mask = -1;
+
+  dhcp6 = grub_dhcp6_options_get (v6h, size);
+  if (!dhcp6)
+    {
+      grub_print_error ();
+      return NULL;
+    }
+
+  grub_net_configure_by_dhcp6_info (name, card, dhcp6, is_def, flags, &inf);
+
+  if (device && dhcp6->boot_file_proto && dhcp6->boot_file_server_ip)
+    {
+      *device = grub_xasprintf ("%s,%s", dhcp6->boot_file_proto, dhcp6->boot_file_server_ip);
+      grub_print_error ();
+    }
+  if (path && dhcp6->boot_file_path)
+    {
+      *path = grub_strdup (dhcp6->boot_file_path);
+      grub_print_error ();
+      if (*path)
+	{
+	  char *slash;
+	  slash = grub_strrchr (*path, '/');
+	  if (slash)
+	    *slash = 0;
+	  else
+	    **path = 0;
+	}
+    }
+
+  grub_dhcp6_options_free (dhcp6);
+
+  if (inf)
+    grub_net_add_ipv6_local (inf, mask);
+
+  return inf;
+}
+
 /*
  * This is called directly from net/ip.c:handle_dgram(), because those
  * BOOTP/DHCP packets are a bit special due to their improper
@@ -672,6 +1342,77 @@ grub_net_process_dhcp (struct grub_net_buff *nb,
     }
 }
 
+grub_err_t
+grub_net_process_dhcp6 (struct grub_net_buff *nb,
+                       struct grub_net_card *card __attribute__ ((unused)))
+{
+  const struct grub_net_dhcp6_packet *v6h;
+  grub_dhcp6_session_t se;
+  grub_size_t size;
+  grub_dhcp6_options_t options;
+
+  v6h = (const struct grub_net_dhcp6_packet *) nb->data;
+  size = nb->tail - nb->data;
+
+  options = grub_dhcp6_options_get (v6h, size);
+  if (!options)
+    return grub_errno;
+
+  if (!options->client_duid || !options->server_duid || !options->ia_addr)
+    {
+      grub_dhcp6_options_free (options);
+      return grub_error (GRUB_ERR_BAD_ARGUMENT, "Bad DHCPv6 Packet");
+    }
+
+  FOR_DHCP6_SESSIONS (se)
+    {
+      if (se->transaction_id == v6h->transaction_id &&
+         grub_memcmp (options->client_duid, &se->duid, sizeof (se->duid)) == 0 &&
+         se->iaid == options->iaid)
+       break;
+    }
+
+  if (!se)
+    {
+      grub_dprintf ("bootp", "DHCPv6 session not found\n");
+      grub_dhcp6_options_free (options);
+      return GRUB_ERR_NONE;
+    }
+
+  if (v6h->message_type == GRUB_NET_DHCP6_ADVERTISE)
+    {
+      if (se->adv)
+       {
+         grub_dprintf ("bootp", "Skipped DHCPv6 Advertised .. \n");
+         grub_dhcp6_options_free (options);
+         return GRUB_ERR_NONE;
+       }
+
+      se->adv = options;
+      return grub_dhcp6_session_send_request (se);
+    }
+  else if (v6h->message_type == GRUB_NET_DHCP6_REPLY)
+    {
+      if (!se->adv)
+       {
+         grub_dprintf ("bootp", "Skipped DHCPv6 Reply .. \n");
+         grub_dhcp6_options_free (options);
+         return GRUB_ERR_NONE;
+       }
+
+      se->reply = options;
+      grub_dhcp6_session_configure_network (se);
+      grub_dhcp6_session_remove (se);
+      return GRUB_ERR_NONE;
+    }
+  else
+    {
+      grub_dhcp6_options_free (options);
+    }
+
+  return GRUB_ERR_NONE;
+}
+
 static grub_err_t
 grub_cmd_dhcpopt (struct grub_command *cmd __attribute__ ((unused)),
 		  int argc, char **args)
@@ -897,180 +1638,174 @@ grub_cmd_bootp (struct grub_command *cmd __attribute__ ((unused)),
   return err;
 }
 
-static grub_command_t cmd_getdhcp, cmd_bootp, cmd_dhcp;
-
-struct grub_net_network_level_interface *
-grub_net_configure_by_dhcpv6_ack (const char *name,
-				  struct grub_net_card *card,
-				  grub_net_interface_flags_t flags
-				    __attribute__((__unused__)),
-				  const grub_net_link_level_address_t *hwaddr,
-				  const struct grub_net_dhcpv6_packet *packet,
-				  int is_def, char **device, char **path)
+static grub_err_t
+grub_cmd_bootp6 (struct grub_command *cmd __attribute__ ((unused)),
+                 int argc, char **args)
 {
-  struct grub_net_network_level_interface *inter = NULL;
-  struct grub_net_network_level_address addr;
-  int mask = -1;
+  struct grub_net_card *card;
+  grub_uint32_t iaid = 0;
+  int interval;
+  grub_err_t err;
+  grub_dhcp6_session_t se;
 
-  if (!device || !path)
-    return NULL;
+  err = GRUB_ERR_NONE;
 
-  *device = 0;
-  *path = 0;
+  FOR_NET_CARDS (card)
+  {
+    struct grub_net_network_level_interface *iface;
 
-  grub_dprintf ("net", "mac address is %02x:%02x:%02x:%02x:%02x:%02x\n",
-		hwaddr->mac[0], hwaddr->mac[1], hwaddr->mac[2],
-		hwaddr->mac[3], hwaddr->mac[4], hwaddr->mac[5]);
+    if (argc > 0 && grub_strcmp (card->name, args[0]) != 0)
+      continue;
 
-  if (is_def)
-    grub_net_default_server = 0;
+    iface = grub_net_ipv6_get_link_local (card, &card->default_address);
+    if (!iface)
+      {
+       grub_dhcp6_session_remove_all ();
+       return grub_errno;
+      }
 
-  if (is_def && !grub_net_default_server && packet)
+    grub_dhcp6_session_add (iface, iaid++);
+  }
+
+  for (interval = 200; interval < 10000; interval *= 2)
     {
-      const grub_uint8_t *options = packet->dhcp_options;
-      unsigned int option_max = 1024 - OFFSET_OF (dhcp_options, packet);
-      unsigned int i;
-
-      for (i = 0; i < option_max - sizeof (grub_net_dhcpv6_option_t); )
-	{
-	  grub_uint16_t num, len;
-	  grub_net_dhcpv6_option_t *opt =
-	    (grub_net_dhcpv6_option_t *)(options + i);
-
-	  num = grub_be_to_cpu16(opt->option_num);
-	  len = grub_be_to_cpu16(opt->option_len);
-
-	  grub_dprintf ("net", "got dhcpv6 option %d len %d\n", num, len);
-
-	  if (len == 0)
-	    break;
-
-	  if (len + i > 1024)
-	    break;
-
-	  if (num == GRUB_NET_DHCP6_BOOTFILE_URL)
-	    {
-	      char *scheme, *userinfo, *host, *file;
-	      char *tmp;
-	      int hostlen;
-	      int port;
-	      int rc = extract_url_info ((const char *)opt->option_data,
-					 (grub_size_t)len,
-					 &scheme, &userinfo, &host, &port,
-					 &file);
-	      if (rc < 0)
-		continue;
-
-	      /* right now this only handles tftp. */
-	      if (grub_strcmp("tftp", scheme))
-		{
-		  grub_free (scheme);
-		  grub_free (userinfo);
-		  grub_free (host);
-		  grub_free (file);
-		  continue;
-		}
-	      grub_free (userinfo);
-
-	      hostlen = grub_strlen (host);
-	      if (hostlen > 2 && host[0] == '[' && host[hostlen-1] == ']')
-		{
-		  tmp = host+1;
-		  host[hostlen-1] = '\0';
-		}
-	      else
-		tmp = host;
-
-	      *device = grub_xasprintf ("%s,%s", scheme, tmp);
-	      grub_free (scheme);
-	      grub_free (host);
-
-	      if (file && *file)
-		{
-		  tmp = grub_strrchr (file, '/');
-		  if (tmp)
-		    *(tmp+1) = '\0';
-		  else
-		    file[0] = '\0';
-		}
-	      else if (!file)
-		file = grub_strdup ("");
-
-	      if (file[0] == '/')
-		{
-		  *path = grub_strdup (file+1);
-		  grub_free (file);
-		}
-	      else
-		*path = file;
-	    }
-	  else if (num == GRUB_NET_DHCP6_IA_NA)
-	    {
-	      const grub_net_dhcpv6_option_t *ia_na_opt;
-	      const grub_net_dhcpv6_opt_ia_na_t *ia_na =
-		(const grub_net_dhcpv6_opt_ia_na_t *)opt;
-	      unsigned int left = len - OFFSET_OF (options, ia_na);
-	      unsigned int j;
-
-	      if ((grub_uint8_t *)ia_na + left >
-		  (grub_uint8_t *)options + option_max)
-		left -= ((grub_uint8_t *)ia_na + left)
-		        - ((grub_uint8_t *)options + option_max);
-
-	      if (len < OFFSET_OF (option_data, opt)
-			+ sizeof (grub_net_dhcpv6_option_t))
-		{
-		  grub_dprintf ("net",
-				"found dhcpv6 ia_na option with no address\n");
-		  continue;
-		}
-
-	      for (j = 0; left > sizeof (grub_net_dhcpv6_option_t); )
-		{
-		  ia_na_opt = (const grub_net_dhcpv6_option_t *)
-			       (ia_na->options + j);
-		  grub_uint16_t ia_na_opt_num, ia_na_opt_len;
-
-		  ia_na_opt_num = grub_be_to_cpu16 (ia_na_opt->option_num);
-		  ia_na_opt_len = grub_be_to_cpu16 (ia_na_opt->option_len);
-		  if (ia_na_opt_len == 0)
-		    break;
-		  if (j + ia_na_opt_len > left)
-		    break;
-		  if (ia_na_opt_num == GRUB_NET_DHCP6_IA_ADDRESS)
-		    {
-		      const grub_net_dhcpv6_opt_ia_address_t *ia_addr;
-
-		      ia_addr = (const grub_net_dhcpv6_opt_ia_address_t *)
-				 ia_na_opt;
-		      addr.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV6;
-		      grub_memcpy(addr.ipv6, ia_addr->ipv6_address,
-				  sizeof (ia_addr->ipv6_address));
-		      inter = grub_net_add_addr (name, card, &addr, hwaddr, 0);
-		    }
-
-		  j += ia_na_opt_len;
-		  left -= ia_na_opt_len;
-		}
-	    }
-
-	  i += len + 4;
-	}
-
-      grub_print_error ();
+      int done = 1;
+
+      FOR_DHCP6_SESSIONS (se)
+       {
+         struct grub_net_buff *nb;
+         struct grub_net_dhcp6_option *opt;
+         struct grub_net_dhcp6_packet *v6h;
+         struct grub_net_dhcp6_option_duid_ll *duid;
+         struct grub_net_dhcp6_option_iana *ia_na;
+         grub_net_network_level_address_t multicast;
+         grub_net_link_level_address_t ll_multicast;
+         struct udphdr *udph;
+
+         multicast.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV6;
+         multicast.ipv6[0] = grub_cpu_to_be64_compile_time (0xff02ULL << 48);
+         multicast.ipv6[1] = grub_cpu_to_be64_compile_time (0x10002ULL);
+
+         err = grub_net_link_layer_resolve (se->iface,
+                   &multicast, &ll_multicast);
+         if (err)
+           {
+             grub_dhcp6_session_remove_all ();
+             return err;
+           }
+
+         nb = grub_netbuff_alloc (GRUB_DHCP6_DEFAULT_NETBUFF_ALLOC_SIZE);
+
+         if (!nb)
+           {
+             grub_dhcp6_session_remove_all ();
+             return grub_errno;
+           }
+
+         err = grub_netbuff_reserve (nb, GRUB_DHCP6_DEFAULT_NETBUFF_ALLOC_SIZE);
+         if (err)
+           {
+             grub_dhcp6_session_remove_all ();
+             grub_netbuff_free (nb);
+             return err;
+           }
+
+         err = grub_netbuff_push (nb, sizeof (*opt) + sizeof (grub_uint16_t));
+         if (err)
+           {
+             grub_dhcp6_session_remove_all ();
+             grub_netbuff_free (nb);
+             return err;
+           }
+
+         opt = (struct grub_net_dhcp6_option *)nb->data;
+         opt->code = grub_cpu_to_be16_compile_time (GRUB_NET_DHCP6_OPTION_ELAPSED_TIME);
+         opt->len = grub_cpu_to_be16_compile_time (sizeof (grub_uint16_t));
+         grub_set_unaligned16 (opt->data, 0);
+
+         err = grub_netbuff_push (nb, sizeof (*opt) + sizeof (*duid));
+         if (err)
+           {
+             grub_dhcp6_session_remove_all ();
+             grub_netbuff_free (nb);
+             return err;
+           }
+
+         opt = (struct grub_net_dhcp6_option *)nb->data;
+         opt->code = grub_cpu_to_be16_compile_time (GRUB_NET_DHCP6_OPTION_CLIENTID);
+         opt->len = grub_cpu_to_be16 (sizeof (*duid));
+
+         duid = (struct grub_net_dhcp6_option_duid_ll *) opt->data;
+         grub_memcpy (duid, &se->duid, sizeof (*duid));
+
+         err = grub_netbuff_push (nb, sizeof (*opt) + sizeof (*ia_na));
+         if (err)
+           {
+             grub_dhcp6_session_remove_all ();
+             grub_netbuff_free (nb);
+             return err;
+           }
+
+         opt = (struct grub_net_dhcp6_option *)nb->data;
+         opt->code = grub_cpu_to_be16_compile_time (GRUB_NET_DHCP6_OPTION_IA_NA);
+         opt->len = grub_cpu_to_be16 (sizeof (*ia_na));
+         ia_na = (struct grub_net_dhcp6_option_iana *)opt->data;
+         ia_na->iaid = grub_cpu_to_be32 (se->iaid);
+         ia_na->t1 = 0;
+         ia_na->t2 = 0;
+
+         err = grub_netbuff_push (nb, sizeof (*v6h));
+         if (err)
+           {
+             grub_dhcp6_session_remove_all ();
+             grub_netbuff_free (nb);
+             return err;
+           }
+
+         v6h = (struct grub_net_dhcp6_packet *)nb->data;
+         v6h->message_type = GRUB_NET_DHCP6_SOLICIT;
+         v6h->transaction_id = se->transaction_id;
+
+         grub_netbuff_push (nb, sizeof (*udph));
+
+         udph = (struct udphdr *) nb->data;
+         udph->src = grub_cpu_to_be16_compile_time (DHCP6_CLIENT_PORT);
+         udph->dst = grub_cpu_to_be16_compile_time (DHCP6_SERVER_PORT);
+         udph->chksum = 0;
+         udph->len = grub_cpu_to_be16 (nb->tail - nb->data);
+
+         udph->chksum = grub_net_ip_transport_checksum (nb, GRUB_NET_IP_UDP,
+                           &se->iface->address, &multicast);
+
+         err = grub_net_send_ip_packet (se->iface, &multicast,
+                   &ll_multicast, nb, GRUB_NET_IP_UDP);
+         done = 0;
+         grub_netbuff_free (nb);
+
+         if (err)
+           {
+             grub_dhcp6_session_remove_all ();
+             return err;
+           }
+       }
+      if (!done)
+       grub_net_poll_cards (interval, 0);
     }
 
-  if (is_def)
+  FOR_DHCP6_SESSIONS (se)
     {
-      grub_env_set ("net_default_interface", name);
-      grub_env_export ("net_default_interface");
+      grub_error_push ();
+      err = grub_error (GRUB_ERR_FILE_NOT_FOUND,
+                       N_("couldn't autoconfigure %s"),
+                       se->iface->card->name);
     }
 
-    if (inter)
-      grub_net_add_ipv6_local (inter, mask);
-    return inter;
+  grub_dhcp6_session_remove_all ();
+
+  return err;
 }
 
+static grub_command_t cmd_getdhcp, cmd_bootp, cmd_dhcp, cmd_bootp6;
 
 void
 grub_bootp_init (void)
@@ -1084,11 +1819,15 @@ grub_bootp_init (void)
   cmd_getdhcp = grub_register_command ("net_get_dhcp_option", grub_cmd_dhcpopt,
 				       N_("VAR INTERFACE NUMBER DESCRIPTION"),
 				       N_("retrieve DHCP option and save it into VAR. If VAR is - then print the value."));
+  cmd_bootp6 = grub_register_command ("net_bootp6", grub_cmd_bootp6,
+				     N_("[CARD]"),
+				     N_("perform a DHCPv6 autoconfiguration"));
 }
 
 void
 grub_bootp_fini (void)
 {
+  grub_unregister_command (cmd_bootp6);
   grub_unregister_command (cmd_getdhcp);
   grub_unregister_command (cmd_bootp);
   grub_unregister_command (cmd_dhcp);
diff --git a/grub-core/net/drivers/efi/efinet.c b/grub-core/net/drivers/efi/efinet.c
index a673bea807a..8e25680db0c 100644
--- a/grub-core/net/drivers/efi/efinet.c
+++ b/grub-core/net/drivers/efi/efinet.c
@@ -393,9 +393,6 @@ grub_efi_net_config_real (grub_efi_handle_t hnd, char **device,
     pxe_mode = pxe->mode;
     if (pxe_mode->using_ipv6)
       {
-	grub_net_link_level_address_t hwaddr;
-	struct grub_net_network_level_interface *intf;
-
 	grub_dprintf ("efinet", "using ipv6 and dhcpv6\n");
 	grub_dprintf ("efinet", "dhcp_ack_received: %s%s\n",
 		      pxe_mode->dhcp_ack_received ? "yes" : "no",
@@ -403,15 +400,14 @@ grub_efi_net_config_real (grub_efi_handle_t hnd, char **device,
 	if (!pxe_mode->dhcp_ack_received)
 	  continue;
 
-	hwaddr.type = GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET;
-	grub_memcpy (hwaddr.mac,
-		     card->efi_net->mode->current_address,
-		     sizeof (hwaddr.mac));
-
-	intf = grub_net_configure_by_dhcpv6_ack (card->name, card, 0, &hwaddr,
-	      (const struct grub_net_dhcpv6_packet *)&pxe_mode->dhcp_ack.dhcpv6,
-	      1, device, path);
-	if (intf && device && path)
+	grub_net_configure_by_dhcpv6_reply (card->name, card, 0,
+					    (struct grub_net_dhcp6_packet *)
+					    &pxe_mode->dhcp_ack,
+					    sizeof (pxe_mode->dhcp_ack),
+					    1, device, path);
+	if (grub_errno)
+	  grub_print_error ();
+	if (device && path)
 	  grub_dprintf ("efinet", "device: `%s' path: `%s'\n", *device, *path);
       }
     else
diff --git a/grub-core/net/ip.c b/grub-core/net/ip.c
index a5896f6dc26..ce6bdc75c6d 100644
--- a/grub-core/net/ip.c
+++ b/grub-core/net/ip.c
@@ -239,6 +239,45 @@ handle_dgram (struct grub_net_buff *nb,
   {
     struct udphdr *udph;
     udph = (struct udphdr *) nb->data;
+
+    if (proto == GRUB_NET_IP_UDP && udph->dst == grub_cpu_to_be16_compile_time (DHCP6_CLIENT_PORT))
+      {
+	if (udph->chksum)
+	  {
+	    grub_uint16_t chk, expected;
+	    chk = udph->chksum;
+	    udph->chksum = 0;
+	    expected = grub_net_ip_transport_checksum (nb,
+						       GRUB_NET_IP_UDP,
+						       source,
+						       dest);
+	    if (expected != chk)
+	      {
+		grub_dprintf ("net", "Invalid UDP checksum. "
+			      "Expected %x, got %x\n",
+			      grub_be_to_cpu16 (expected),
+			      grub_be_to_cpu16 (chk));
+		grub_netbuff_free (nb);
+		return GRUB_ERR_NONE;
+	      }
+	    udph->chksum = chk;
+	  }
+
+	err = grub_netbuff_pull (nb, sizeof (*udph));
+	if (err)
+	  {
+	    grub_netbuff_free (nb);
+	    return err;
+	  }
+
+	err = grub_net_process_dhcp6 (nb, card);
+	if (err)
+	  grub_print_error ();
+
+	grub_netbuff_free (nb);
+	return GRUB_ERR_NONE;
+      }
+
     if (proto == GRUB_NET_IP_UDP && grub_be_to_cpu16 (udph->dst) == 68)
       {
 	const struct grub_net_bootp_packet *bootp;
diff --git a/include/grub/efi/api.h b/include/grub/efi/api.h
index 99628801478..7614b58dca8 100644
--- a/include/grub/efi/api.h
+++ b/include/grub/efi/api.h
@@ -1532,7 +1532,7 @@ typedef struct grub_efi_pxe_ip_filter
 {
   grub_efi_uint8_t filters;
   grub_efi_uint8_t ip_count;
-  grub_efi_uint8_t reserved;
+  grub_efi_uint16_t reserved;
   grub_efi_ip_address_t ip_list[GRUB_EFI_PXE_MAX_IPCNT];
 } grub_efi_pxe_ip_filter_t;
 
diff --git a/include/grub/net.h b/include/grub/net.h
index d55d505a03a..543251f7273 100644
--- a/include/grub/net.h
+++ b/include/grub/net.h
@@ -451,50 +451,65 @@ struct grub_net_bootp_packet
   grub_uint8_t vendor[0];
 } GRUB_PACKED;
 
-enum
-  {
-    GRUB_NET_DHCP6_IA_NA = 3,
-    GRUB_NET_DHCP6_IA_ADDRESS = 5,
-    GRUB_NET_DHCP6_BOOTFILE_URL = 59,
-  };
-
-struct grub_net_dhcpv6_option
+struct grub_net_dhcp6_packet
 {
-  grub_uint16_t option_num;
-  grub_uint16_t option_len;
-  grub_uint8_t option_data[];
+  grub_uint32_t message_type:8;
+  grub_uint32_t transaction_id:24;
+  grub_uint8_t dhcp_options[0];
 } GRUB_PACKED;
-typedef struct grub_net_dhcpv6_option grub_net_dhcpv6_option_t;
 
-struct grub_net_dhcpv6_opt_ia_na
-{
-  grub_uint16_t option_num;
-  grub_uint16_t option_len;
+struct grub_net_dhcp6_option {
+  grub_uint16_t code;
+  grub_uint16_t len;
+  grub_uint8_t data[0];
+} GRUB_PACKED;
+
+struct grub_net_dhcp6_option_iana {
   grub_uint32_t iaid;
   grub_uint32_t t1;
   grub_uint32_t t2;
-  grub_uint8_t options[];
+  grub_uint8_t data[0];
 } GRUB_PACKED;
-typedef struct grub_net_dhcpv6_opt_ia_na grub_net_dhcpv6_opt_ia_na_t;
 
-struct grub_net_dhcpv6_opt_ia_address
-{
-  grub_uint16_t option_num;
-  grub_uint16_t option_len;
-  grub_uint64_t ipv6_address[2];
+struct grub_net_dhcp6_option_iaaddr {
+  grub_uint8_t addr[16];
   grub_uint32_t preferred_lifetime;
   grub_uint32_t valid_lifetime;
-  grub_uint8_t options[];
+  grub_uint8_t data[0];
 } GRUB_PACKED;
-typedef struct grub_net_dhcpv6_opt_ia_address grub_net_dhcpv6_opt_ia_address_t;
 
-struct grub_net_dhcpv6_packet
+struct grub_net_dhcp6_option_duid_ll
 {
-  grub_uint32_t message_type:8;
-  grub_uint32_t transaction_id:24;
-  grub_uint8_t dhcp_options[1024];
+  grub_uint16_t type;
+  grub_uint16_t hw_type;
+  grub_uint8_t hwaddr[6];
 } GRUB_PACKED;
-typedef struct grub_net_dhcpv6_packet grub_net_dhcpv6_packet_t;
+
+enum
+  {
+    GRUB_NET_DHCP6_SOLICIT = 1,
+    GRUB_NET_DHCP6_ADVERTISE = 2,
+    GRUB_NET_DHCP6_REQUEST = 3,
+    GRUB_NET_DHCP6_REPLY = 7
+  };
+
+enum
+  {
+    DHCP6_CLIENT_PORT = 546,
+    DHCP6_SERVER_PORT = 547
+  };
+
+enum
+  {
+    GRUB_NET_DHCP6_OPTION_CLIENTID = 1,
+    GRUB_NET_DHCP6_OPTION_SERVERID = 2,
+    GRUB_NET_DHCP6_OPTION_IA_NA = 3,
+    GRUB_NET_DHCP6_OPTION_IAADDR = 5,
+    GRUB_NET_DHCP6_OPTION_ORO = 6,
+    GRUB_NET_DHCP6_OPTION_ELAPSED_TIME = 8,
+    GRUB_NET_DHCP6_OPTION_DNS_SERVERS = 23,
+    GRUB_NET_DHCP6_OPTION_BOOTFILE_URL = 59
+  };
 
 #define	GRUB_NET_BOOTP_RFC1048_MAGIC_0	0x63
 #define	GRUB_NET_BOOTP_RFC1048_MAGIC_1	0x82
@@ -532,12 +547,12 @@ grub_net_configure_by_dhcp_ack (const char *name,
 				int is_def, char **device, char **path);
 
 struct grub_net_network_level_interface *
-grub_net_configure_by_dhcpv6_ack (const char *name,
-				 struct grub_net_card *card,
-				 grub_net_interface_flags_t flags,
-				 const grub_net_link_level_address_t *hwaddr,
-				 const struct grub_net_dhcpv6_packet *packet,
-				 int is_def, char **device, char **path);
+grub_net_configure_by_dhcpv6_reply (const char *name,
+				    struct grub_net_card *card,
+				    grub_net_interface_flags_t flags,
+				    const struct grub_net_dhcp6_packet *v6,
+				    grub_size_t size,
+				    int is_def, char **device, char **path);
 
 int
 grub_ipv6_get_masksize(grub_uint16_t *mask);
@@ -554,6 +569,10 @@ void
 grub_net_process_dhcp (struct grub_net_buff *nb,
 		       struct grub_net_network_level_interface *iface);
 
+grub_err_t
+grub_net_process_dhcp6 (struct grub_net_buff *nb,
+			struct grub_net_card *card);
+
 int
 grub_net_hwaddr_cmp (const grub_net_link_level_address_t *a,
 		     const grub_net_link_level_address_t *b);