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From 77e75c900368ef656c00d4c485eff7b1d66d58eb Mon Sep 17 00:00:00 2001
From: Michael Chang <mchang@suse.com>
Date: Sun, 10 Jul 2016 23:46:06 +0800
Subject: [PATCH 241/250] New net_bootp6 command and UEFI IPv6 PXE support

When grub2 image is booted from UEFI IPv6 PXE, the DHCPv6 Reply packet is
cached in firmware buffer which can be obtained by PXE Base Code protocol. The
network interface can be setup through the parameters in that obtained packet.

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>
---
 grub-core/net/bootp.c              | 1047 ++++++++++++++++++++++++++++++------
 grub-core/net/drivers/efi/efinet.c |   20 +-
 grub-core/net/ip.c                 |   39 ++
 include/grub/efi/api.h             |    2 +-
 include/grub/net.h                 |   80 +--
 5 files changed, 988 insertions(+), 200 deletions(-)

diff --git a/grub-core/net/bootp.c b/grub-core/net/bootp.c
index da3e454466b..6995f986744 100644
--- a/grub-core/net/bootp.c
+++ b/grub-core/net/bootp.c
@@ -25,6 +25,98 @@
 #include <grub/net/udp.h>
 #include <grub/net/url.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;
+}
 
 static char *
 grub_env_write_readonly (struct grub_env_var *var __attribute__ ((unused)),
@@ -350,178 +442,577 @@ grub_net_configure_by_dhcp_ack (const char *name,
   return inter;
 }
 
-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)
-{
-  struct grub_net_network_level_interface *inter = NULL;
-  struct grub_net_network_level_address addr;
-  int mask = -1;
-
-  if (!device || !path)
+/* 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;
 
-  *device = 0;
-  *path = 0;
-
-  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 (is_def)
-    grub_net_default_server = 0;
-
-  if (is_def && !grub_net_default_server && packet)
+  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(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)
     {
-      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;
+      inf = grub_net_add_addr (name, card, dhcp6->ia_addr, &card->default_address, flags);
 
-	      *device = grub_xasprintf ("%s,%s", scheme, tmp);
-	      grub_free (scheme);
-	      grub_free (host);
+      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 (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;
-		}
-	    }
+      if (ret_inf)
+	*ret_inf = inf;
+    }
 
-	  i += len + 4;
-	}
+  if (dhcp6->dns_server_addrs)
+    {
+      grub_uint16_t i;
 
-      grub_print_error ();
+      for (i = 0; i < dhcp6->num_dns_server; ++i)
+	grub_net_add_dns_server (dhcp6->dns_server_addrs + i);
     }
 
-  if (is_def)
+  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;
+
+  FOR_DHCP6_SESSIONS (se)
+    {
+      grub_dhcp6_session_remove (se);
+      se = grub_dhcp6_sessions;
+    }
+}
+
+static grub_err_t
+grub_dhcp6_session_configure_network (grub_dhcp6_session_t se)
+{
+  char *name;
 
-    if (inter)
-      grub_net_add_ipv6_local (inter, mask);
-    return inter;
+  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;
+
+  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);
+  return inf;
+}
 
 void
 grub_net_process_dhcp (struct grub_net_buff *nb,
@@ -555,6 +1046,77 @@ 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)
@@ -827,7 +1389,174 @@ grub_cmd_bootp (struct grub_command *cmd __attribute__ ((unused)),
   return err;
 }
 
-static grub_command_t cmd_getdhcp, cmd_bootp;
+static grub_err_t
+grub_cmd_bootp6 (struct grub_command *cmd __attribute__ ((unused)),
+		  int argc, char **args)
+{
+  struct grub_net_card *card;
+  grub_uint32_t iaid = 0;
+  int interval;
+  grub_err_t err;
+  grub_dhcp6_session_t se;
+
+  err = GRUB_ERR_NONE;
+
+  FOR_NET_CARDS (card)
+  {
+    struct grub_net_network_level_interface *iface;
+
+    if (argc > 0 && grub_strcmp (card->name, args[0]) != 0)
+      continue;
+
+    iface = grub_net_ipv6_get_link_local (card, &card->default_address);
+    if (!iface)
+      {
+	grub_dhcp6_session_remove_all ();
+	return grub_errno;
+      }
+
+    grub_dhcp6_session_add (iface, iaid++);
+  }
+
+  for (interval = 200; interval < 10000; interval *= 2)
+    {
+      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);
+    }
+
+  FOR_DHCP6_SESSIONS (se)
+    {
+      grub_error_push ();
+      err = grub_error (GRUB_ERR_FILE_NOT_FOUND,
+			N_("couldn't autoconfigure %s"),
+			se->iface->card->name);
+    }
+
+  grub_dhcp6_session_remove_all ();
+
+  return err;
+}
+
+static grub_command_t cmd_getdhcp, cmd_bootp, cmd_bootp6;
 
 void
 grub_bootp_init (void)
@@ -838,6 +1567,9 @@ 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
@@ -845,4 +1577,5 @@ grub_bootp_fini (void)
 {
   grub_unregister_command (cmd_getdhcp);
   grub_unregister_command (cmd_bootp);
+  grub_unregister_command (cmd_bootp6);
 }
diff --git a/grub-core/net/drivers/efi/efinet.c b/grub-core/net/drivers/efi/efinet.c
index 329024b6f2c..6cc139fb8fc 100644
--- a/grub-core/net/drivers/efi/efinet.c
+++ b/grub-core/net/drivers/efi/efinet.c
@@ -473,9 +473,6 @@ 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",
@@ -483,15 +480,14 @@ 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 7c95cc7464a..fd641b2410d 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 ddc5ecfb03d..6a545cc6d5d 100644
--- a/include/grub/efi/api.h
+++ b/include/grub/efi/api.h
@@ -1511,7 +1511,7 @@ 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 24232ec71fc..373ad1080cf 100644
--- a/include/grub/net.h
+++ b/include/grub/net.h
@@ -445,46 +445,62 @@ struct grub_net_bootp_packet
 
 enum
   {
-    GRUB_NET_DHCP6_IA_NA = 3,
-    GRUB_NET_DHCP6_IA_ADDRESS = 5,
-    GRUB_NET_DHCP6_BOOTFILE_URL = 59,
+    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
   };
 
-struct grub_net_dhcpv6_option
-{
-  grub_uint16_t option_num;
-  grub_uint16_t option_len;
-  grub_uint8_t option_data[];
+struct grub_net_dhcp6_option {
+  grub_uint16_t code;
+  grub_uint16_t len;
+  grub_uint8_t data[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_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_uint16_t type;
+  grub_uint16_t hw_type;
+  grub_uint8_t hwaddr[6];
+} GRUB_PACKED;
+
+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
+  };
+
+struct grub_net_dhcp6_packet
 {
   grub_uint32_t message_type:8;
   grub_uint32_t transaction_id:24;
-  grub_uint8_t dhcp_options[1024];
+  grub_uint8_t dhcp_options[0];
 } GRUB_PACKED;
 typedef struct grub_net_dhcpv6_packet grub_net_dhcpv6_packet_t;
 
@@ -517,12 +533,12 @@ 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);
@@ -539,6 +555,10 @@ void
 grub_net_process_dhcp (struct grub_net_buff *nb,
 		       struct grub_net_card *card);
 
+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);
-- 
2.14.3