[PATCH 8/9] efinet: Setting network from UEFI device path

[Keng-Yu Lin <kengyu@hpe.com>]

From: Michael Chang <mchang@suse.com>

The PXE Base Code protocol used to obtain cached PXE DHCPACK packet is no
longer provided for HTTP Boot. Instead, we have to get the HTTP boot
information from the device path nodes defined in following UEFI Specification
sections.

 9.3.5.12 IPv4 Device Path
 9.3.5.13 IPv6 Device Path
 9.3.5.23 Uniform Resource Identifiers (URI) Device Path

This patch basically does:

include/grub/efi/api.h:
Add new structure of Uniform Resource Identifiers (URI) Device Path

grub-core/net/drivers/efi/efinet.c:
Check if PXE Base Code is available, if not it will try to obtain the netboot
information from the device path where the image booted from. The DHCPACK
packet is recoverd from the information in device patch and feed into the same
DHCP packet processing functions to ensure the network interface is setting up
the same way it used to be.

Signed-off-by: Michael Chang <mchang@suse.com>
Signed-off-by: Ken Lin <ken.lin@hpe.com>
---
 grub-core/net/drivers/efi/efinet.c | 268 +++++++++++++++++++++++++++++++++++--
 include/grub/efi/api.h             |  11 ++
 2 files changed, 270 insertions(+), 9 deletions(-)

diff --git a/grub-core/net/drivers/efi/efinet.c b/grub-core/net/drivers/efi/efinet.c
index fc90415..2d3b00f 100644
--- a/grub-core/net/drivers/efi/efinet.c
+++ b/grub-core/net/drivers/efi/efinet.c
@@ -23,6 +23,7 @@
 #include <grub/efi/api.h>
 #include <grub/efi/efi.h>
 #include <grub/i18n.h>
+#include <grub/net/netbuff.h>
 
 GRUB_MOD_LICENSE ("GPLv3+");
 
@@ -324,6 +325,221 @@ grub_efinet_findcards (void)
   grub_free (handles);
 }
 
+static struct grub_net_buff *
+grub_efinet_create_dhcp_ack_from_device_path (grub_efi_device_path_t *dp, int *use_ipv6)
+{
+  grub_efi_uint16_t uri_len;
+  grub_efi_device_path_t *ldp, *ddp;
+  grub_efi_uri_device_path_t *uri_dp;
+  struct grub_net_buff *nb;
+  grub_err_t err;
+
+  ddp = grub_efi_duplicate_device_path (dp);
+  ldp = grub_efi_find_last_device_path (ddp);
+
+  if (GRUB_EFI_DEVICE_PATH_TYPE (ldp) != GRUB_EFI_MESSAGING_DEVICE_PATH_TYPE
+      || GRUB_EFI_DEVICE_PATH_SUBTYPE (ldp) != GRUB_EFI_URI_DEVICE_PATH_SUBTYPE)
+    {
+      grub_free (ddp);
+      return NULL;
+    }
+
+  uri_len = GRUB_EFI_DEVICE_PATH_LENGTH (ldp) > 4 ? GRUB_EFI_DEVICE_PATH_LENGTH (ldp) - 4  : 0;
+
+  if (!uri_len)
+    {
+      grub_free (ddp);
+      return NULL;
+    }
+
+  uri_dp = (grub_efi_uri_device_path_t *) ldp;
+
+  ldp->type = GRUB_EFI_END_DEVICE_PATH_TYPE;
+  ldp->subtype = GRUB_EFI_END_ENTIRE_DEVICE_PATH_SUBTYPE;
+  ldp->length = sizeof (*ldp);
+
+  ldp = grub_efi_find_last_device_path (ddp);
+
+  if (GRUB_EFI_DEVICE_PATH_TYPE (ldp) != GRUB_EFI_MESSAGING_DEVICE_PATH_TYPE
+      || (GRUB_EFI_DEVICE_PATH_SUBTYPE (ldp) != GRUB_EFI_IPV4_DEVICE_PATH_SUBTYPE
+          && GRUB_EFI_DEVICE_PATH_SUBTYPE (ldp) != GRUB_EFI_IPV6_DEVICE_PATH_SUBTYPE))
+    {
+      grub_free (ddp);
+      return NULL;
+    }
+
+  nb = grub_netbuff_alloc (512);
+  if (!nb)
+    return NULL;
+
+  if (GRUB_EFI_DEVICE_PATH_SUBTYPE (ldp) == GRUB_EFI_IPV4_DEVICE_PATH_SUBTYPE)
+    {
+      grub_efi_ipv4_device_path_t *ipv4 = (grub_efi_ipv4_device_path_t *) ldp;
+      struct grub_net_bootp_packet *bp;
+      grub_uint8_t *ptr;
+
+      bp = (struct grub_net_bootp_packet *) nb->tail;
+      err = grub_netbuff_put (nb, sizeof (*bp) + 4);
+      if (err)
+	{
+	  grub_free (ddp);
+	  grub_netbuff_free (nb);
+	  return NULL;
+	}
+
+      if (sizeof(bp->boot_file) < uri_len)
+	{
+	  grub_free (ddp);
+	  grub_netbuff_free (nb);
+	  return NULL;
+	}
+      grub_memcpy (bp->boot_file, uri_dp->uri, uri_len);
+      grub_memcpy (&bp->your_ip, ipv4->local_ip_address, sizeof (bp->your_ip));
+      grub_memcpy (&bp->server_ip, ipv4->remote_ip_address, sizeof (bp->server_ip));
+
+      bp->vendor[0] = GRUB_NET_BOOTP_RFC1048_MAGIC_0;
+      bp->vendor[1] = GRUB_NET_BOOTP_RFC1048_MAGIC_1;
+      bp->vendor[2] = GRUB_NET_BOOTP_RFC1048_MAGIC_2;
+      bp->vendor[3] = GRUB_NET_BOOTP_RFC1048_MAGIC_3;
+
+      ptr = nb->tail;
+      err = grub_netbuff_put (nb, sizeof (ipv4->subnet_mask) + 2);
+      if (err)
+	{
+	  grub_free (ddp);
+	  grub_netbuff_free (nb);
+	  return NULL;
+	}
+      *ptr++ = GRUB_NET_BOOTP_NETMASK;
+      *ptr++ = sizeof (ipv4->subnet_mask);
+      grub_memcpy (ptr, ipv4->subnet_mask, sizeof (ipv4->subnet_mask));
+
+      ptr = nb->tail;
+      err = grub_netbuff_put (nb, sizeof (ipv4->gateway_ip_address) + 2);
+      if (err)
+	{
+	  grub_free (ddp);
+	  grub_netbuff_free (nb);
+	  return NULL;
+	}
+      *ptr++ = GRUB_NET_BOOTP_ROUTER;
+      *ptr++ = sizeof (ipv4->gateway_ip_address);
+      grub_memcpy (ptr, ipv4->gateway_ip_address, sizeof (ipv4->gateway_ip_address));
+
+      ptr = nb->tail;
+      err = grub_netbuff_put (nb, sizeof ("HTTPClient") + 1);
+      if (err)
+	{
+	  grub_free (ddp);
+	  grub_netbuff_free (nb);
+	  return NULL;
+	}
+      *ptr++ = GRUB_NET_BOOTP_VENDOR_CLASS_IDENTIFIER;
+      *ptr++ = sizeof ("HTTPClient") - 1;
+      grub_memcpy (ptr, "HTTPClient", sizeof ("HTTPClient") - 1);
+
+      ptr = nb->tail;
+      err = grub_netbuff_put (nb, 1);
+      if (err)
+	{
+	  grub_free (ddp);
+	  grub_netbuff_free (nb);
+	  return NULL;
+	}
+      *ptr = GRUB_NET_BOOTP_END;
+      *use_ipv6 = 0;
+
+      ldp->type = GRUB_EFI_END_DEVICE_PATH_TYPE;
+      ldp->subtype = GRUB_EFI_END_ENTIRE_DEVICE_PATH_SUBTYPE;
+      ldp->length = sizeof (*ldp);
+      ldp = grub_efi_find_last_device_path (ddp);
+
+      if (GRUB_EFI_DEVICE_PATH_SUBTYPE (ldp) ==  GRUB_EFI_MAC_ADDRESS_DEVICE_PATH_SUBTYPE)
+	{
+	  grub_efi_mac_address_device_path_t *mac = (grub_efi_mac_address_device_path_t *) ldp;
+	  bp->hw_type = mac->if_type;
+	  bp->hw_len = sizeof (bp->mac_addr);
+	  grub_memcpy (bp->mac_addr, mac->mac_address, bp->hw_len);
+	}
+    }
+  else
+    {
+      grub_efi_ipv6_device_path_t *ipv6 = (grub_efi_ipv6_device_path_t *) ldp;
+
+      struct grub_net_dhcp6_packet *d6p;
+      struct grub_net_dhcp6_option *opt;
+      struct grub_net_dhcp6_option_iana *iana;
+      struct grub_net_dhcp6_option_iaaddr *iaaddr;
+
+      d6p = (struct grub_net_dhcp6_packet *)nb->tail;
+      err = grub_netbuff_put (nb, sizeof(*d6p));
+      if (err)
+	{
+	  grub_free (ddp);
+	  grub_netbuff_free (nb);
+	  return NULL;
+	}
+      d6p->message_type = GRUB_NET_DHCP6_REPLY;
+
+      opt = (struct grub_net_dhcp6_option *)nb->tail;
+      err = grub_netbuff_put (nb, sizeof(*opt));
+      if (err)
+	{
+	  grub_free (ddp);
+	  grub_netbuff_free (nb);
+	  return NULL;
+	}
+      opt->code = grub_cpu_to_be16_compile_time (GRUB_NET_DHCP6_OPTION_IA_NA);
+      opt->len = grub_cpu_to_be16_compile_time (sizeof(*iana) + sizeof(*opt) + sizeof(*iaaddr));
+
+      err = grub_netbuff_put (nb, sizeof(*iana));
+      if (err)
+	{
+	  grub_free (ddp);
+	  grub_netbuff_free (nb);
+	  return NULL;
+	}
+
+      opt = (struct grub_net_dhcp6_option *)nb->tail;
+      err = grub_netbuff_put (nb, sizeof(*opt));
+      if (err)
+	{
+	  grub_free (ddp);
+	  grub_netbuff_free (nb);
+	  return NULL;
+	}
+      opt->code = grub_cpu_to_be16_compile_time (GRUB_NET_DHCP6_OPTION_IAADDR);
+      opt->len = grub_cpu_to_be16_compile_time (sizeof (*iaaddr));
+
+      iaaddr = (struct grub_net_dhcp6_option_iaaddr *)nb->tail;
+      err = grub_netbuff_put (nb, sizeof(*iaaddr));
+      if (err)
+	{
+	  grub_free (ddp);
+	  grub_netbuff_free (nb);
+	  return NULL;
+	}
+      grub_memcpy (iaaddr->addr, ipv6->local_ip_address, sizeof(ipv6->local_ip_address));
+
+      opt = (struct grub_net_dhcp6_option *)nb->tail;
+      err = grub_netbuff_put (nb, sizeof(*opt) + uri_len);
+      if (err)
+	{
+	  grub_free (ddp);
+	  grub_netbuff_free (nb);
+	  return NULL;
+	}
+      opt->code = grub_cpu_to_be16_compile_time (GRUB_NET_DHCP6_OPTION_BOOTFILE_URL);
+      opt->len = grub_cpu_to_be16 (uri_len);
+      grub_memcpy (opt->data, uri_dp->uri, uri_len);
+
+      *use_ipv6 = 1;
+    }
+
+  grub_free (ddp);
+  return nb;
+}
+
 static void
 grub_efi_net_config_real (grub_efi_handle_t hnd, char **device,
 			  char **path)
@@ -340,6 +556,11 @@ grub_efi_net_config_real (grub_efi_handle_t hnd, char **device,
     grub_efi_device_path_t *cdp;
     struct grub_efi_pxe *pxe;
     struct grub_efi_pxe_mode *pxe_mode;
+    grub_uint8_t *packet_buf;
+    grub_size_t packet_bufsz ;
+    int ipv6;
+    struct grub_net_buff *nb = NULL;
+
     if (card->driver != &efidriver)
       continue;
     cdp = grub_efi_get_device_path (card->efi_handle);
@@ -359,11 +580,21 @@ grub_efi_net_config_real (grub_efi_handle_t hnd, char **device,
 	ldp = grub_efi_find_last_device_path (dp);
 	if (GRUB_EFI_DEVICE_PATH_TYPE (ldp) != GRUB_EFI_MESSAGING_DEVICE_PATH_TYPE
 	    || (GRUB_EFI_DEVICE_PATH_SUBTYPE (ldp) != GRUB_EFI_IPV4_DEVICE_PATH_SUBTYPE
-		&& GRUB_EFI_DEVICE_PATH_SUBTYPE (ldp) != GRUB_EFI_IPV6_DEVICE_PATH_SUBTYPE))
+		&& GRUB_EFI_DEVICE_PATH_SUBTYPE (ldp) != GRUB_EFI_IPV6_DEVICE_PATH_SUBTYPE
+		&& GRUB_EFI_DEVICE_PATH_SUBTYPE (ldp) != GRUB_EFI_URI_DEVICE_PATH_SUBTYPE))
 	  continue;
 	dup_dp = grub_efi_duplicate_device_path (dp);
 	if (!dup_dp)
 	  continue;
+
+	if (GRUB_EFI_DEVICE_PATH_SUBTYPE (ldp) == GRUB_EFI_URI_DEVICE_PATH_SUBTYPE)
+	  {
+	    dup_ldp = grub_efi_find_last_device_path (dup_dp);
+	    dup_ldp->type = GRUB_EFI_END_DEVICE_PATH_TYPE;
+	    dup_ldp->subtype = GRUB_EFI_END_ENTIRE_DEVICE_PATH_SUBTYPE;
+	    dup_ldp->length = sizeof (*dup_ldp);
+	  }
+
 	dup_ldp = grub_efi_find_last_device_path (dup_dp);
 	dup_ldp->type = GRUB_EFI_END_DEVICE_PATH_TYPE;
 	dup_ldp->subtype = GRUB_EFI_END_ENTIRE_DEVICE_PATH_SUBTYPE;
@@ -375,16 +606,31 @@ grub_efi_net_config_real (grub_efi_handle_t hnd, char **device,
       }
     pxe = grub_efi_open_protocol (hnd, &pxe_io_guid,
 				  GRUB_EFI_OPEN_PROTOCOL_GET_PROTOCOL);
-    if (! pxe)
-      continue;
-    pxe_mode = pxe->mode;
+    if (!pxe)
+      {
+	nb = grub_efinet_create_dhcp_ack_from_device_path (dp, &ipv6);
+	if (!nb)
+	  {
+	    grub_print_error ();
+	    continue;
+	  }
+	packet_buf = nb->head;
+	packet_bufsz = nb->tail - nb->head;
+      }
+    else
+      {
+	pxe_mode = pxe->mode;
+	packet_buf = (grub_uint8_t *) &pxe_mode->dhcp_ack;
+	packet_bufsz = sizeof (pxe_mode->dhcp_ack);
+	ipv6 = pxe_mode->using_ipv6;
+      }
 
-    if (pxe_mode->using_ipv6)
+    if (ipv6)
       {
 	grub_net_configure_by_dhcpv6_reply (card->name, card, 0,
 					    (struct grub_net_dhcp6_packet *)
-					    &pxe_mode->dhcp_ack,
-					    sizeof (pxe_mode->dhcp_ack),
+					    packet_buf,
+					    packet_bufsz,
 					    1, device, path);
 	if (grub_errno)
 	  grub_print_error ();
@@ -393,10 +639,14 @@ grub_efi_net_config_real (grub_efi_handle_t hnd, char **device,
       {
 	grub_net_configure_by_dhcp_ack (card->name, card, 0,
 					(struct grub_net_bootp_packet *)
-					&pxe_mode->dhcp_ack,
-					sizeof (pxe_mode->dhcp_ack),
+					packet_buf,
+					packet_bufsz,
 					1, device, path);
       }
+
+    if (nb)
+      grub_netbuff_free (nb);
+
     return;
   }
 }
diff --git a/include/grub/efi/api.h b/include/grub/efi/api.h
index 92f9b5a..d5a1256 100644
--- a/include/grub/efi/api.h
+++ b/include/grub/efi/api.h
@@ -825,6 +825,8 @@ struct grub_efi_ipv4_device_path
   grub_efi_uint16_t remote_port;
   grub_efi_uint16_t protocol;
   grub_efi_uint8_t static_ip_address;
+  grub_efi_ipv4_address_t gateway_ip_address;
+  grub_efi_ipv4_address_t subnet_mask;
 } GRUB_PACKED;
 typedef struct grub_efi_ipv4_device_path grub_efi_ipv4_device_path_t;
 
@@ -879,6 +881,15 @@ struct grub_efi_sata_device_path
 } GRUB_PACKED;
 typedef struct grub_efi_sata_device_path grub_efi_sata_device_path_t;
 
+#define GRUB_EFI_URI_DEVICE_PATH_SUBTYPE		24
+
+struct grub_efi_uri_device_path
+{
+  grub_efi_device_path_t header;
+  grub_efi_uint8_t uri[0];
+} GRUB_PACKED;
+typedef struct grub_efi_uri_device_path grub_efi_uri_device_path_t;
+
 #define GRUB_EFI_VENDOR_MESSAGING_DEVICE_PATH_SUBTYPE	10
 
 /* Media Device Path.  */
-- 
2.7.4