From fba1410c59351eb760ccf2de1b4b80bda407e635 Mon Sep 17 00:00:00 2001

From: Andrzej Kacprowski <andrzej.kacprowski@intel.com>

Date: Fri, 21 Apr 2017 10:06:20 +0200

Subject: [PATCH 248/261] Add support for non-Ethernet network cards

This patch replaces fixed 6-byte link layer address with

up to 32-byte variable sized address.

This allows supporting Infiniband and Omni-Path fabric

which use 20-byte address, but other network card types

can also take advantage of this change.

The network card driver is responsible for replacing L2

header provided by grub2 if needed.

This approach is compatible with UEFI network stack which

also allows up to 32-byte variable size link address.

The BOOTP/DHCP packet format is limited to 16 byte client

hardware address, if link address is more that 16-bytes

then chaddr field in BOOTP it will be set to 0 as per rfc4390.

Resolves: rhbz#1370642

Signed-off-by: Andrzej Kacprowski <andrzej.kacprowski@intel.com>

Conflicts:

	grub-core/net/ip.c

---

 grub-core/net/arp.c                    | 159 +++++++++++++++++++++------------

 grub-core/net/bootp.c                  |  14 ++-

 grub-core/net/drivers/efi/efinet.c     |   8 +-

 grub-core/net/drivers/emu/emunet.c     |   1 +

 grub-core/net/drivers/i386/pc/pxe.c    |  13 +--

 grub-core/net/drivers/ieee1275/ofnet.c |   2 +

 grub-core/net/drivers/uboot/ubootnet.c |   1 +

 grub-core/net/ethernet.c               |  83 +++++++++--------

 grub-core/net/icmp6.c                  |  15 ++--

 grub-core/net/ip.c                     |   4 +-

 grub-core/net/net.c                    |  48 +++++-----

 include/grub/net.h                     |  19 ++--

 12 files changed, 214 insertions(+), 153 deletions(-)

diff --git a/grub-core/net/arp.c b/grub-core/net/arp.c

index 996473e10..badd2d3e6 100644

--- a/grub-core/net/arp.c

+++ b/grub-core/net/arp.c

@@ -31,22 +31,12 @@ enum

     ARP_REPLY = 2

   };

-enum

-  {

-    /* IANA ARP constant to define hardware type as ethernet. */

-    GRUB_NET_ARPHRD_ETHERNET = 1

-  };

-

-struct arppkt {

+struct arphdr {

   grub_uint16_t hrd;

   grub_uint16_t pro;

   grub_uint8_t hln;

   grub_uint8_t pln;

   grub_uint16_t op;

-  grub_uint8_t sender_mac[6];

-  grub_uint32_t sender_ip;

-  grub_uint8_t recv_mac[6];

-  grub_uint32_t recv_ip;

 } GRUB_PACKED;

 static int have_pending;

@@ -57,12 +47,16 @@ grub_net_arp_send_request (struct grub_net_network_level_interface *inf,

 			   const grub_net_network_level_address_t *proto_addr)

 {

   struct grub_net_buff nb;

-  struct arppkt *arp_packet;

+  struct arphdr *arp_header;

   grub_net_link_level_address_t target_mac_addr;

   grub_err_t err;

   int i;

   grub_uint8_t *nbd;

   grub_uint8_t arp_data[128];

+  grub_uint8_t hln;

+  grub_uint8_t pln;

+  grub_uint8_t arp_packet_len;

+  grub_uint8_t *tmp_ptr;

   if (proto_addr->type != GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4)

     return grub_error (GRUB_ERR_BUG, "unsupported address family");

@@ -73,25 +67,39 @@ grub_net_arp_send_request (struct grub_net_network_level_interface *inf,

   grub_netbuff_clear (&nb);

   grub_netbuff_reserve (&nb, 128);

-  err = grub_netbuff_push (&nb, sizeof (*arp_packet));

+  hln = inf->card->default_address.len;

+  pln = sizeof (proto_addr->ipv4);

+  arp_packet_len = sizeof (*arp_header) + 2 * (hln + pln);

+

+  err = grub_netbuff_push (&nb, arp_packet_len);

   if (err)

     return err;

-  arp_packet = (struct arppkt *) nb.data;

-  arp_packet->hrd = grub_cpu_to_be16_compile_time (GRUB_NET_ARPHRD_ETHERNET);

-  arp_packet->hln = 6;

-  arp_packet->pro = grub_cpu_to_be16_compile_time (GRUB_NET_ETHERTYPE_IP);

-  arp_packet->pln = 4;

-  arp_packet->op = grub_cpu_to_be16_compile_time (ARP_REQUEST);

-  /* Sender hardware address.  */

-  grub_memcpy (aux, &inf->hwaddress.mac, 6);

-

-  grub_memcpy (arp_packet->sender_mac, &inf->hwaddress.mac, 6);

-  arp_packet->sender_ip = inf->address.ipv4;

-  grub_memset (arp_packet->recv_mac, 0, 6);

-  arp_packet->recv_ip = proto_addr->ipv4;

-  /* Target protocol address */

-  grub_memset (&target_mac_addr.mac, 0xff, 6);

+  arp_header = (struct arphdr *) nb.data;

+  arp_header->hrd = grub_cpu_to_be16 (inf->card->default_address.type);

+  arp_header->hln = hln;

+  arp_header->pro = grub_cpu_to_be16_compile_time (GRUB_NET_ETHERTYPE_IP);

+  arp_header->pln = pln;

+  arp_header->op = grub_cpu_to_be16_compile_time (ARP_REQUEST);

+  tmp_ptr = nb.data + sizeof (*arp_header);

+

+  /* The source hardware address. */

+  grub_memcpy (tmp_ptr, inf->hwaddress.mac, hln);

+  tmp_ptr += hln;

+

+  /* The source protocol address. */

+  grub_memcpy (tmp_ptr, &inf->address.ipv4, pln);

+  tmp_ptr += pln;

+

+  /* The target hardware address. */

+  grub_memset (tmp_ptr, 0, hln);

+  tmp_ptr += hln;

+

+  /* The target protocol address */

+  grub_memcpy (tmp_ptr, &proto_addr->ipv4, pln);

+  tmp_ptr += pln;

+

+  grub_memset (&target_mac_addr.mac, 0xff, hln);

   nbd = nb.data;

   send_ethernet_packet (inf, &nb, target_mac_addr, GRUB_NET_ETHERTYPE_ARP);

@@ -116,37 +124,62 @@ grub_err_t

 grub_net_arp_receive (struct grub_net_buff *nb,

 		      struct grub_net_card *card)

 {

-  struct arppkt *arp_packet = (struct arppkt *) nb->data;

+  struct arphdr *arp_header = (struct arphdr *) nb->data;

   grub_net_network_level_address_t sender_addr, target_addr;

   grub_net_link_level_address_t sender_mac_addr;

   struct grub_net_network_level_interface *inf;

-

-  if (arp_packet->pro != grub_cpu_to_be16_compile_time (GRUB_NET_ETHERTYPE_IP)

-      || arp_packet->pln != 4 || arp_packet->hln != 6

-      || nb->tail - nb->data < (int) sizeof (*arp_packet))

+  grub_uint16_t hw_type;

+  grub_uint8_t hln;

+  grub_uint8_t pln;

+  grub_uint8_t arp_packet_len;

+  grub_uint8_t *tmp_ptr;

+

+  hw_type = card->default_address.type;

+  hln = card->default_address.len;

+  pln = sizeof(sender_addr.ipv4);

+  arp_packet_len = sizeof (*arp_header) + 2 * (pln + hln);

+

+  if (arp_header->pro != grub_cpu_to_be16_compile_time (GRUB_NET_ETHERTYPE_IP)

+      || arp_header->hrd != grub_cpu_to_be16 (hw_type)

+      || arp_header->hln != hln || arp_header->pln != pln

+      || nb->tail - nb->data < (int) arp_packet_len) {

     return GRUB_ERR_NONE;

+  }

+  tmp_ptr =  nb->data + sizeof (*arp_header);

+

+  /* The source hardware address. */

+  sender_mac_addr.type = hw_type;

+  sender_mac_addr.len = hln;

+  grub_memcpy (sender_mac_addr.mac, tmp_ptr, hln);

+  tmp_ptr += hln;

+

+  /* The source protocol address. */

   sender_addr.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4;

-  target_addr.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4;

-  sender_addr.ipv4 = arp_packet->sender_ip;

-  target_addr.ipv4 = arp_packet->recv_ip;

-  if (arp_packet->sender_ip == pending_req)

-    have_pending = 1;

+  grub_memcpy(&sender_addr.ipv4, tmp_ptr, pln);

+  tmp_ptr += pln;

-  sender_mac_addr.type = GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET;

-  grub_memcpy (sender_mac_addr.mac, arp_packet->sender_mac,

-	       sizeof (sender_mac_addr.mac));

   grub_net_link_layer_add_address (card, &sender_addr, &sender_mac_addr, 1);

+  /* The target hardware address. */

+  tmp_ptr += hln;

+

+  /* The target protocol address. */

+  target_addr.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4;

+  grub_memcpy(&target_addr.ipv4, tmp_ptr, pln);

+

+  if (sender_addr.ipv4 == pending_req)

+    have_pending = 1;

+

   FOR_NET_NETWORK_LEVEL_INTERFACES (inf)

   {

     /* Am I the protocol address target? */

     if (grub_net_addr_cmp (&inf->address, &target_addr) == 0

-	&& arp_packet->op == grub_cpu_to_be16_compile_time (ARP_REQUEST))

+	&& arp_header->op == grub_cpu_to_be16_compile_time (ARP_REQUEST))

       {

 	grub_net_link_level_address_t target;

 	struct grub_net_buff nb_reply;

-	struct arppkt *arp_reply;

+	struct arphdr *arp_reply;

 	grub_uint8_t arp_data[128];

 	grub_err_t err;

@@ -155,25 +188,39 @@ grub_net_arp_receive (struct grub_net_buff *nb,

 	grub_netbuff_clear (&nb_reply);

 	grub_netbuff_reserve (&nb_reply, 128);

-	err = grub_netbuff_push (&nb_reply, sizeof (*arp_packet));

+	err = grub_netbuff_push (&nb_reply, arp_packet_len);

 	if (err)

 	  return err;

-	arp_reply = (struct arppkt *) nb_reply.data;

+	arp_reply = (struct arphdr *) nb_reply.data;

-	arp_reply->hrd = grub_cpu_to_be16_compile_time (GRUB_NET_ARPHRD_ETHERNET);

+	arp_reply->hrd = grub_cpu_to_be16 (hw_type);

 	arp_reply->pro = grub_cpu_to_be16_compile_time (GRUB_NET_ETHERTYPE_IP);

-	arp_reply->pln = 4;

-	arp_reply->hln = 6;

+	arp_reply->pln = pln;

+	arp_reply->hln = hln;

 	arp_reply->op = grub_cpu_to_be16_compile_time (ARP_REPLY);

-	arp_reply->sender_ip = arp_packet->recv_ip;

-	arp_reply->recv_ip = arp_packet->sender_ip;

-	arp_reply->hln = 6;

-

-	target.type = GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET;

-	grub_memcpy (target.mac, arp_packet->sender_mac, 6);

-	grub_memcpy (arp_reply->sender_mac, inf->hwaddress.mac, 6);

-	grub_memcpy (arp_reply->recv_mac, arp_packet->sender_mac, 6);

+

+	tmp_ptr = nb_reply.data + sizeof (*arp_reply);

+

+	/* The source hardware address. */

+	grub_memcpy (tmp_ptr, inf->hwaddress.mac, hln);

+	tmp_ptr += hln;

+

+	/* The source protocol address. */

+	grub_memcpy (tmp_ptr, &target_addr.ipv4, pln);

+	tmp_ptr += pln;

+

+	/* The target hardware address. */

+	grub_memcpy (tmp_ptr, sender_mac_addr.mac, hln);

+	tmp_ptr += hln;

+

+	/* The target protocol address */

+	grub_memcpy (tmp_ptr, &sender_addr.ipv4, pln);

+	tmp_ptr += pln;

+

+	target.type = hw_type;

+	target.len = hln;

+	grub_memcpy (target.mac, sender_mac_addr.mac, hln);

 	/* Change operation to REPLY and send packet */

 	send_ethernet_packet (inf, &nb_reply, target, GRUB_NET_ETHERTYPE_ARP);

diff --git a/grub-core/net/bootp.c b/grub-core/net/bootp.c

index dfdf7e08d..0a2d11b88 100644

--- a/grub-core/net/bootp.c

+++ b/grub-core/net/bootp.c

@@ -219,7 +219,6 @@ grub_net_configure_by_dhcp_ack (const char *name,

 				int is_def, char **device, char **path)

 {

   grub_net_network_level_address_t addr;

-  grub_net_link_level_address_t hwaddr;

   struct grub_net_network_level_interface *inter;

   int mask = -1;

@@ -231,12 +230,8 @@ grub_net_configure_by_dhcp_ack (const char *name,

   if (path)

     *path = 0;

-  grub_memcpy (hwaddr.mac, bp->mac_addr,

-	       bp->hw_len < sizeof (hwaddr.mac) ? bp->hw_len

-	       : sizeof (hwaddr.mac));

-  hwaddr.type = GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET;

-

-  inter = grub_net_add_addr (name, card, &addr, &hwaddr, flags);

+  grub_dprintf("dhcp", "configuring dhcp for %s\n", name);

+  inter = grub_net_add_addr (name, card, &addr, &card->default_address, flags);

   if (!inter)

     return 0;

@@ -762,7 +757,8 @@ grub_cmd_bootp (struct grub_command *cmd __attribute__ ((unused)),

 	  grub_memset (pack, 0, sizeof (*pack) + 64);

 	  pack->opcode = 1;

 	  pack->hw_type = 1;

-	  pack->hw_len = 6;

+	  pack->hw_len = ifaces[j].hwaddress.len > 16 ? 0

+						      : ifaces[j].hwaddress.len;

 	  err = grub_get_datetime (&date);

 	  if (err || !grub_datetime2unixtime (&date, &t))

 	    {

@@ -773,7 +769,7 @@ grub_cmd_bootp (struct grub_command *cmd __attribute__ ((unused)),

 	  ifaces[j].dhcp_xid = pack->xid;

 	  pack->seconds = grub_cpu_to_be16 (t);

-	  grub_memcpy (&pack->mac_addr, &ifaces[j].hwaddress.mac, 6); 

+	  grub_memcpy (&pack->mac_addr, &ifaces[j].hwaddress.mac, pack->hw_len);

 	  grub_netbuff_push (nb, sizeof (*udph));

diff --git a/grub-core/net/drivers/efi/efinet.c b/grub-core/net/drivers/efi/efinet.c

index 69b0fc7a8..b9ed13fca 100644

--- a/grub-core/net/drivers/efi/efinet.c

+++ b/grub-core/net/drivers/efi/efinet.c

@@ -290,6 +290,9 @@ grub_efinet_findcards (void)

 	/* This should not happen... Why?  */

 	continue;

+      if (net->mode->hwaddr_size > GRUB_NET_MAX_LINK_ADDRESS_SIZE)

+	continue;

+

       if (net->mode->state == GRUB_EFI_NETWORK_STOPPED

 	  && efi_call_1 (net->start, net) != GRUB_EFI_SUCCESS)

 	continue;

@@ -326,10 +329,11 @@ grub_efinet_findcards (void)

       card->name = grub_xasprintf ("efinet%d", i++);

       card->driver = &efidriver;

       card->flags = 0;

-      card->default_address.type = GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET;

+      card->default_address.type = net->mode->if_type;

+      card->default_address.len = net->mode->hwaddr_size;

       grub_memcpy (card->default_address.mac,

 		   net->mode->current_address,

-		   sizeof (card->default_address.mac));

+		   net->mode->hwaddr_size);

       card->efi_net = net;

       card->efi_handle = *handle;

diff --git a/grub-core/net/drivers/emu/emunet.c b/grub-core/net/drivers/emu/emunet.c

index 7c977cd52..962b0c86d 100644

--- a/grub-core/net/drivers/emu/emunet.c

+++ b/grub-core/net/drivers/emu/emunet.c

@@ -46,6 +46,7 @@ static struct grub_net_card emucard =

     .mtu = 1500,

     .default_address = {

 			 .type = GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET,

+			 . len = 6,

 			 {.mac = {0, 1, 2, 3, 4, 5}}

 		       },

     .flags = 0

diff --git a/grub-core/net/drivers/i386/pc/pxe.c b/grub-core/net/drivers/i386/pc/pxe.c

index e8c0b22e2..566014950 100644

--- a/grub-core/net/drivers/i386/pc/pxe.c

+++ b/grub-core/net/drivers/i386/pc/pxe.c

@@ -387,20 +387,21 @@ GRUB_MOD_INIT(pxe)

   grub_memset (ui, 0, sizeof (*ui));

   grub_pxe_call (GRUB_PXENV_UNDI_GET_INFORMATION, ui, pxe_rm_entry);

+  grub_pxe_card.default_address.len = 6;

   grub_memcpy (grub_pxe_card.default_address.mac, ui->current_addr,

-	       sizeof (grub_pxe_card.default_address.mac));

-  for (i = 0; i < sizeof (grub_pxe_card.default_address.mac); i++)

+	       grub_pxe_card.default_address.len);

+  for (i = 0; i < grub_pxe_card.default_address.len; i++)

     if (grub_pxe_card.default_address.mac[i] != 0)

       break;

-  if (i != sizeof (grub_pxe_card.default_address.mac))

+  if (i != grub_pxe_card.default_address.len)

     {

-      for (i = 0; i < sizeof (grub_pxe_card.default_address.mac); i++)

+      for (i = 0; i < grub_pxe_card.default_address.len; i++)

 	if (grub_pxe_card.default_address.mac[i] != 0xff)

 	  break;

     }

-  if (i == sizeof (grub_pxe_card.default_address.mac))

+  if (i == grub_pxe_card.default_address.len)

     grub_memcpy (grub_pxe_card.default_address.mac, ui->permanent_addr,

-		 sizeof (grub_pxe_card.default_address.mac));

+		 grub_pxe_card.default_address.len);

   grub_pxe_card.mtu = ui->mtu;

   grub_pxe_card.default_address.type = GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET;

diff --git a/grub-core/net/drivers/ieee1275/ofnet.c b/grub-core/net/drivers/ieee1275/ofnet.c

index cd24ddc99..5a199bcaa 100644

--- a/grub-core/net/drivers/ieee1275/ofnet.c

+++ b/grub-core/net/drivers/ieee1275/ofnet.c

@@ -154,6 +154,7 @@ grub_ieee1275_parse_bootpath (const char *devpath, char *bootpath,

   struct grub_net_network_level_interface *inter;

   hw_addr.type = GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET;

+  hw_addr.len = 6;

   args = bootpath + grub_strlen (devpath) + 1;

   do

@@ -369,6 +370,7 @@ search_net_devices (struct grub_ieee1275_devalias *alias)

     grub_memcpy (&lla.mac, pprop, 6);

   lla.type = GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET;

+  lla.len = 6;

   card->default_address = lla;

   card->txbufsize = ALIGN_UP (card->mtu, 64) + 256;

diff --git a/grub-core/net/drivers/uboot/ubootnet.c b/grub-core/net/drivers/uboot/ubootnet.c

index 056052e40..22ebcbf21 100644

--- a/grub-core/net/drivers/uboot/ubootnet.c

+++ b/grub-core/net/drivers/uboot/ubootnet.c

@@ -131,6 +131,7 @@ GRUB_MOD_INIT (ubootnet)

       grub_memcpy (&(card->default_address.mac), &devinfo->di_net.hwaddr, 6);

       card->default_address.type = GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET;

+      card->default_address.len = 6;

       card->txbufsize = ALIGN_UP (card->mtu, 64) + 256;

       card->txbuf = grub_zalloc (card->txbufsize);

diff --git a/grub-core/net/ethernet.c b/grub-core/net/ethernet.c

index faaca67c5..1b479d3ca 100644

--- a/grub-core/net/ethernet.c

+++ b/grub-core/net/ethernet.c

@@ -29,13 +29,6 @@

 #define LLCADDRMASK 0x7f

-struct etherhdr

-{

-  grub_uint8_t dst[6];

-  grub_uint8_t src[6];

-  grub_uint16_t type;

-} GRUB_PACKED;

-

 struct llchdr

 {

   grub_uint8_t dsap;

@@ -55,13 +48,15 @@ send_ethernet_packet (struct grub_net_network_level_interface *inf,

 		      grub_net_link_level_address_t target_addr,

 		      grub_net_ethertype_t ethertype)

 {

-  struct etherhdr *eth;

+  grub_uint8_t *eth;

   grub_err_t err;

   grub_uint32_t vlantag = 0;

-  grub_uint8_t etherhdr_size;

+  grub_uint8_t hw_addr_len = inf->card->default_address.len;

+  grub_uint8_t etherhdr_size = 2 * hw_addr_len + 2;

-  etherhdr_size = sizeof (*eth);

-  COMPILE_TIME_ASSERT (sizeof (*eth) + 4 < GRUB_NET_MAX_LINK_HEADER_SIZE);

+  /* Source and destination link addresses + ethertype + vlan tag */

+  COMPILE_TIME_ASSERT ((GRUB_NET_MAX_LINK_ADDRESS_SIZE * 2 + 2 + 4) <

+		       GRUB_NET_MAX_LINK_HEADER_SIZE);

   const char *vlantag_text = grub_env_get ("vlan-tag");

   if (vlantag_text != 0) {

@@ -72,11 +67,22 @@ send_ethernet_packet (struct grub_net_network_level_interface *inf,

   err = grub_netbuff_push (nb, etherhdr_size);

   if (err)

     return err;

-  eth = (struct etherhdr *) nb->data;

-  grub_memcpy (eth->dst, target_addr.mac, 6);

-  grub_memcpy (eth->src, inf->hwaddress.mac, 6);

+  eth = nb->data;

+  grub_memcpy (eth, target_addr.mac, hw_addr_len);

+  eth += hw_addr_len;

+  grub_memcpy (eth, inf->hwaddress.mac, hw_addr_len);

+  eth += hw_addr_len;

+

+  /* Check if a vlan-tag is present. */

+  if (vlantag != 0)

+    {

+      *((grub_uint32_t *)eth) = grub_cpu_to_be32 (vlantag);

+      eth += sizeof (vlantag);

+    }

+

+  /* Write ethertype */

+  *((grub_uint16_t*) eth) = grub_cpu_to_be16 (ethertype);

-  eth->type = grub_cpu_to_be16 (ethertype);

   if (!inf->card->opened)

     {

       err = GRUB_ERR_NONE;

@@ -87,18 +93,6 @@ send_ethernet_packet (struct grub_net_network_level_interface *inf,

       inf->card->opened = 1;

     }

-  /* Check if a vlan-tag is needed. */

-  if (vlantag != 0)

-    {

-      /* Move eth type to the right */

-      grub_memcpy((char *) nb->data + etherhdr_size - 2,

-                  (char *) nb->data + etherhdr_size - 6, 2);

-

-      /* Add the tag in the middle */

-      grub_memcpy((char *) nb->data + etherhdr_size - 6,

-                  &vlantag, 4);

-    }

-

   return inf->card->driver->send (inf->card, nb);

 }

@@ -106,29 +100,37 @@ grub_err_t

 grub_net_recv_ethernet_packet (struct grub_net_buff *nb,

 			       struct grub_net_card *card)

 {

-  struct etherhdr *eth;

+  grub_uint8_t *eth;

   struct llchdr *llch;

   struct snaphdr *snaph;

   grub_net_ethertype_t type;

   grub_net_link_level_address_t hwaddress;

   grub_net_link_level_address_t src_hwaddress;

   grub_err_t err;

-  grub_uint8_t etherhdr_size = sizeof (*eth);

+  grub_uint8_t hw_addr_len = card->default_address.len;

+  grub_uint8_t etherhdr_size = 2 * hw_addr_len + 2;

-  grub_uint16_t vlantag_identifier = 0;

-  grub_memcpy (&vlantag_identifier, nb->data + etherhdr_size - 2, 2);

+  eth = nb->data;

-  /* Check if a vlan-tag is present. */

-  if (vlantag_identifier == VLANTAG_IDENTIFIER)

+  hwaddress.type = card->default_address.type;

+  hwaddress.len = hw_addr_len;

+  grub_memcpy (hwaddress.mac, eth, hw_addr_len);

+  eth += hw_addr_len;

+

+  src_hwaddress.type = card->default_address.type;

+  src_hwaddress.len = hw_addr_len;

+  grub_memcpy (src_hwaddress.mac, eth, hw_addr_len);

+  eth += hw_addr_len;

+

+  type = grub_be_to_cpu16 (*(grub_uint16_t*)(eth));

+  if (type == VLANTAG_IDENTIFIER)

     {

+      /* Skip vlan tag */

       etherhdr_size += 4;

-      /* Move eth type to the original position */

-      grub_memcpy((char *) nb->data + etherhdr_size - 6,

-                  (char *) nb->data + etherhdr_size - 2, 2);

+      eth += 4;

+      type = grub_be_to_cpu16 (*(grub_uint16_t*)(eth));

     }

-  eth = (struct etherhdr *) nb->data;

-  type = grub_be_to_cpu16 (eth->type);

   err = grub_netbuff_pull (nb, etherhdr_size);

   if (err)

     return err;

@@ -148,11 +150,6 @@ grub_net_recv_ethernet_packet (struct grub_net_buff *nb,

 	}

     }

-  hwaddress.type = GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET;

-  grub_memcpy (hwaddress.mac, eth->dst, sizeof (hwaddress.mac));

-  src_hwaddress.type = GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET;

-  grub_memcpy (src_hwaddress.mac, eth->src, sizeof (src_hwaddress.mac));

-

   switch (type)

     {

       /* ARP packet. */

diff --git a/grub-core/net/icmp6.c b/grub-core/net/icmp6.c

index 7953e68ec..7e7a6bcbd 100644

--- a/grub-core/net/icmp6.c

+++ b/grub-core/net/icmp6.c

@@ -230,8 +230,9 @@ grub_net_recv_icmp6_packet (struct grub_net_buff *nb,

 		&& ohdr->len == 1)

 	      {

 		grub_net_link_level_address_t ll_address;

-		ll_address.type = GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET;

-		grub_memcpy (ll_address.mac, ohdr + 1, sizeof (ll_address.mac));

+		ll_address.type = card->default_address.type;

+		ll_address.len = card->default_address.len;

+		grub_memcpy (ll_address.mac, ohdr + 1, ll_address.len);

 		grub_net_link_layer_add_address (card, source, &ll_address, 0);

 	      }

 	  }

@@ -334,8 +335,9 @@ grub_net_recv_icmp6_packet (struct grub_net_buff *nb,

 		&& ohdr->len == 1)

 	      {

 		grub_net_link_level_address_t ll_address;

-		ll_address.type = GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET;

-		grub_memcpy (ll_address.mac, ohdr + 1, sizeof (ll_address.mac));

+		ll_address.type = card->default_address.type;

+		ll_address.len = card->default_address.len;

+		grub_memcpy (ll_address.mac, ohdr + 1, ll_address.len);

 		grub_net_link_layer_add_address (card, source, &ll_address, 0);

 	      }

 	  }

@@ -366,8 +368,9 @@ grub_net_recv_icmp6_packet (struct grub_net_buff *nb,

 		&& ohdr->len == 1)

 	      {

 		grub_net_link_level_address_t ll_address;

-		ll_address.type = GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET;

-		grub_memcpy (ll_address.mac, ohdr + 1, sizeof (ll_address.mac));

+		ll_address.type = card->default_address.type;

+		ll_address.len = card->default_address.len;

+		grub_memcpy (ll_address.mac, ohdr + 1, ll_address.len);

 		grub_net_link_layer_add_address (card, source, &ll_address, 0);

 	      }

 	    if (ohdr->type == OPTION_PREFIX && ohdr->len == 4)

diff --git a/grub-core/net/ip.c b/grub-core/net/ip.c

index 9e7930caa..311213fee 100644

--- a/grub-core/net/ip.c

+++ b/grub-core/net/ip.c

@@ -273,8 +273,8 @@ handle_dgram (struct grub_net_buff *nb,

 	      && inf->address.type == GRUB_NET_NETWORK_LEVEL_PROTOCOL_DHCP_RECV

 	      && inf->dhcp_xid == bootp->xid

 	      && inf->hwaddress.type == GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET

-	      && grub_memcmp (inf->hwaddress.mac, &bootp->mac_addr,

-			      sizeof (inf->hwaddress.mac)) == 0)

+	      && (grub_memcmp (inf->hwaddress.mac, &bootp->mac_addr,

+			       bootp->hw_len) == 0 || bootp->hw_len == 0))

 	    {

 	      grub_net_process_dhcp (nb, inf->card);

 	      grub_netbuff_free (nb);

diff --git a/grub-core/net/net.c b/grub-core/net/net.c

index fc6f714bf..b3a80ba29 100644

--- a/grub-core/net/net.c

+++ b/grub-core/net/net.c

@@ -143,8 +143,9 @@ grub_net_link_layer_resolve (struct grub_net_network_level_interface *inf,

 								   << 48)

 	  && proto_addr->ipv6[1] == (grub_be_to_cpu64_compile_time (1))))

     {

-      hw_addr->type = GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET;

-      grub_memset (hw_addr->mac, -1, 6);

+      hw_addr->type = inf->card->default_address.type;

+      hw_addr->len = inf->card->default_address.len;

+      grub_memset (hw_addr->mac, -1, hw_addr->len);

       return GRUB_ERR_NONE;

     }

@@ -152,6 +153,7 @@ grub_net_link_layer_resolve (struct grub_net_network_level_interface *inf,

       && ((grub_be_to_cpu64 (proto_addr->ipv6[0]) >> 56) == 0xff))

     {

       hw_addr->type = GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET;

+      hw_addr->len = inf->card->default_address.len;

       hw_addr->mac[0] = 0x33;

       hw_addr->mac[1] = 0x33;

       hw_addr->mac[2] = ((grub_be_to_cpu64 (proto_addr->ipv6[1]) >> 24) & 0xff);

@@ -771,23 +773,21 @@ grub_net_addr_to_str (const grub_net_network_level_address_t *target, char *buf)

 void

 grub_net_hwaddr_to_str (const grub_net_link_level_address_t *addr, char *str)

 {

-  str[0] = 0;

-  switch (addr->type)

+  char *ptr;

+  unsigned i;

+

+  if (addr->len > GRUB_NET_MAX_LINK_ADDRESS_SIZE)

     {

-    case GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET:

-      {

-	char *ptr;

-	unsigned i;

-	for (ptr = str, i = 0; i < ARRAY_SIZE (addr->mac); i++)

-	  {

-	    grub_snprintf (ptr, GRUB_NET_MAX_STR_HWADDR_LEN - (ptr - str),

-			   "%02x:", addr->mac[i] & 0xff);

-	    ptr += (sizeof ("XX:") - 1);

-	  }

-      return;

-      }

+       str[0] = 0;

+       grub_printf (_("Unsupported hw address type %d len %d\n"),

+		    addr->type, addr->len);

+       return;

+    }

+  for (ptr = str, i = 0; i < addr->len; i++)

+    {

+      ptr += grub_snprintf (ptr, GRUB_NET_MAX_STR_HWADDR_LEN - (ptr - str),

+		     "%02x:", addr->mac[i] & 0xff);

     }

-  grub_printf (_("Unsupported hw address type %d\n"), addr->type);

 }

 int

@@ -798,13 +798,17 @@ grub_net_hwaddr_cmp (const grub_net_link_level_address_t *a,

     return -1;

   if (a->type > b->type)

     return +1;

-  switch (a->type)

+  if (a->len < b->len)

+    return -1;

+  if (a->len > b->len)

+    return +1;

+  if (a->len > GRUB_NET_MAX_LINK_ADDRESS_SIZE)

     {

-    case GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET:

-      return grub_memcmp (a->mac, b->mac, sizeof (a->mac));

+      grub_printf (_("Unsupported hw address type %d len %d\n"),

+		   a->type, a->len);

+      return + 1;

     }

-  grub_printf (_("Unsupported hw address type %d\n"), a->type);

-  return 1;

+  return grub_memcmp (a->mac, b->mac, a->len);

 }

 int

diff --git a/include/grub/net.h b/include/grub/net.h

index b1bc23048..0d9213d67 100644

--- a/include/grub/net.h

+++ b/include/grub/net.h

@@ -29,7 +29,8 @@

 enum

   {

-    GRUB_NET_MAX_LINK_HEADER_SIZE = 64,

+    GRUB_NET_MAX_LINK_HEADER_SIZE = 96,

+    GRUB_NET_MAX_LINK_ADDRESS_SIZE = 32,

     GRUB_NET_UDP_HEADER_SIZE = 8,

     GRUB_NET_TCP_HEADER_SIZE = 20,