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[PATCH 3/4] efinet: UEFI IPv6 PXE support


From: Javier Martinez Canillas
Subject: [PATCH 3/4] efinet: UEFI IPv6 PXE support
Date: Thu, 4 Jun 2020 09:33:25 +0200

From: Michael Chang <mchang@suse.com>

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.

Signed-off-by: Michael Chang <mchang@suse.com>
Signed-off-by: Ken Lin <ken.lin@hpe.com>
Signed-off-by: Peter Jones <pjones@redhat.com>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
---

 grub-core/net/drivers/efi/efinet.c |  45 +++++++--
 include/grub/efi/api.h             | 146 +++++++++++++++++++++++++++--
 2 files changed, 177 insertions(+), 14 deletions(-)

diff --git a/grub-core/net/drivers/efi/efinet.c 
b/grub-core/net/drivers/efi/efinet.c
index 5388f952ba9..7dbd353af5a 100644
--- a/grub-core/net/drivers/efi/efinet.c
+++ b/grub-core/net/drivers/efi/efinet.c
@@ -329,7 +329,7 @@ grub_efi_net_config_real (grub_efi_handle_t hnd, char 
**device,
                          char **path)
 {
   struct grub_net_card *card;
-  grub_efi_device_path_t *dp;
+  grub_efi_device_path_t *dp, *ldp = NULL;
 
   dp = grub_efi_get_device_path (hnd);
   if (! dp)
@@ -345,9 +345,12 @@ grub_efi_net_config_real (grub_efi_handle_t hnd, char 
**device,
     cdp = grub_efi_get_device_path (card->efi_handle);
     if (! cdp)
       continue;
+
+    ldp = grub_efi_find_last_device_path (dp);
+
     if (grub_efi_compare_device_paths (dp, cdp) != 0)
       {
-       grub_efi_device_path_t *ldp, *dup_dp, *dup_ldp;
+       grub_efi_device_path_t *dup_dp, *dup_ldp;
        int match;
 
        /* EDK2 UEFI PXE driver creates pseudo devices with type IPv4/IPv6
@@ -356,7 +359,6 @@ grub_efi_net_config_real (grub_efi_handle_t hnd, char 
**device,
           devices. We skip them when enumerating cards, so here we need to
           find matching MAC 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))
@@ -378,11 +380,38 @@ grub_efi_net_config_real (grub_efi_handle_t hnd, char 
**device,
     if (! pxe)
       continue;
     pxe_mode = pxe->mode;
-    grub_net_configure_by_dhcp_ack (card->name, card, 0,
-                                   (struct grub_net_bootp_packet *)
-                                   &pxe_mode->dhcp_ack,
-                                   sizeof (pxe_mode->dhcp_ack),
-                                   1, device, path);
+
+    if (pxe_mode->using_ipv6)
+      {
+       grub_dprintf ("efinet", "using ipv6 and dhcpv6\n");
+       grub_dprintf ("efinet", "dhcp_ack_received: %s%s\n",
+                     pxe_mode->dhcp_ack_received ? "yes" : "no",
+                     pxe_mode->dhcp_ack_received ? "" : " cannot continue");
+       if (!pxe_mode->dhcp_ack_received)
+         continue;
+
+       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);
+       if (grub_errno)
+         grub_print_error ();
+      }
+    else
+      {
+       grub_dprintf ("efinet", "using ipv4 and dhcp\n");
+       grub_net_configure_by_dhcp_ack (card->name, card, 0,
+                                       (struct grub_net_bootp_packet *)
+                                       &pxe_mode->dhcp_ack,
+                                       sizeof (pxe_mode->dhcp_ack),
+                                       1, device, path);
+       grub_dprintf ("efinet", "device: `%s' path: `%s'\n", *device, *path);
+      }
     return;
   }
 }
diff --git a/include/grub/efi/api.h b/include/grub/efi/api.h
index 937058d6899..db2a8395c78 100644
--- a/include/grub/efi/api.h
+++ b/include/grub/efi/api.h
@@ -577,10 +577,16 @@ typedef void *grub_efi_handle_t;
 typedef void *grub_efi_event_t;
 typedef grub_efi_uint64_t grub_efi_lba_t;
 typedef grub_efi_uintn_t grub_efi_tpl_t;
-typedef grub_uint8_t grub_efi_mac_address_t[32];
-typedef grub_uint8_t grub_efi_ipv4_address_t[4];
-typedef grub_uint16_t grub_efi_ipv6_address_t[8];
-typedef grub_uint8_t grub_efi_ip_address_t[8] __attribute__ ((aligned(4)));
+typedef grub_efi_uint8_t grub_efi_mac_address_t[32];
+typedef grub_efi_uint8_t grub_efi_ipv4_address_t[4];
+typedef grub_efi_uint8_t grub_efi_ipv6_address_t[16];
+typedef union
+{
+  grub_efi_uint32_t addr[4];
+  grub_efi_ipv4_address_t v4;
+  grub_efi_ipv6_address_t v6;
+} grub_efi_ip_address_t __attribute__ ((aligned(4)));
+
 typedef grub_efi_uint64_t grub_efi_physical_address_t;
 typedef grub_efi_uint64_t grub_efi_virtual_address_t;
 
@@ -1455,16 +1461,144 @@ struct grub_efi_simple_text_output_interface
 };
 typedef struct grub_efi_simple_text_output_interface 
grub_efi_simple_text_output_interface_t;
 
-typedef grub_uint8_t grub_efi_pxe_packet_t[1472];
+typedef struct grub_efi_pxe_dhcpv4_packet
+{
+  grub_efi_uint8_t bootp_opcode;
+  grub_efi_uint8_t bootp_hwtype;
+  grub_efi_uint8_t bootp_hwaddr_len;
+  grub_efi_uint8_t bootp_gate_hops;
+  grub_efi_uint32_t bootp_ident;
+  grub_efi_uint16_t bootp_seconds;
+  grub_efi_uint16_t bootp_flags;
+  grub_efi_uint8_t bootp_ci_addr[4];
+  grub_efi_uint8_t bootp_yi_addr[4];
+  grub_efi_uint8_t bootp_si_addr[4];
+  grub_efi_uint8_t bootp_gi_addr[4];
+  grub_efi_uint8_t bootp_hw_addr[16];
+  grub_efi_uint8_t bootp_srv_name[64];
+  grub_efi_uint8_t bootp_boot_file[128];
+  grub_efi_uint32_t dhcp_magik;
+  grub_efi_uint8_t dhcp_options[56];
+} grub_efi_pxe_dhcpv4_packet_t;
+
+struct grub_efi_pxe_dhcpv6_packet
+{
+  grub_efi_uint32_t message_type:8;
+  grub_efi_uint32_t transaction_id:24;
+  grub_efi_uint8_t dhcp_options[1024];
+} GRUB_PACKED;
+typedef struct grub_efi_pxe_dhcpv6_packet grub_efi_pxe_dhcpv6_packet_t;
+
+typedef union
+{
+  grub_efi_uint8_t raw[1472];
+  grub_efi_pxe_dhcpv4_packet_t dhcpv4;
+  grub_efi_pxe_dhcpv6_packet_t dhcpv6;
+} grub_efi_pxe_packet_t;
+
+typedef struct grub_efi_pxe_icmp_error
+{
+  grub_efi_uint8_t type;
+  grub_efi_uint8_t code;
+  grub_efi_uint16_t checksum;
+  union
+    {
+      grub_efi_uint32_t reserved;
+      grub_efi_uint32_t mtu;
+      grub_efi_uint32_t pointer;
+      struct
+       {
+         grub_efi_uint16_t identifier;
+         grub_efi_uint16_t sequence;
+       } echo;
+    } u;
+  grub_efi_uint8_t data[494];
+} grub_efi_pxe_icmp_error_t;
+
+typedef struct grub_efi_pxe_tftp_error
+{
+  grub_efi_uint8_t error_code;
+  grub_efi_char8_t error_string[127];
+} grub_efi_pxe_tftp_error_t;
+
+typedef struct {
+  grub_uint8_t addr[4];
+} grub_efi_pxe_ipv4_address_t;
+
+typedef struct {
+  grub_uint8_t addr[16];
+} grub_efi_pxe_ipv6_address_t;
+
+typedef struct {
+  grub_uint8_t addr[32];
+} grub_efi_pxe_mac_address_t;
+
+typedef union {
+  grub_uint32_t addr[4];
+  grub_efi_pxe_ipv4_address_t v4;
+  grub_efi_pxe_ipv6_address_t v6;
+} grub_efi_pxe_ip_address_t;
+
+#define GRUB_EFI_PXE_BASE_CODE_MAX_IPCNT 8
+typedef struct grub_efi_pxe_ip_filter
+{
+  grub_efi_uint8_t filters;
+  grub_efi_uint8_t ip_count;
+  grub_efi_uint16_t reserved;
+  grub_efi_ip_address_t ip_list[GRUB_EFI_PXE_BASE_CODE_MAX_IPCNT];
+} grub_efi_pxe_ip_filter_t;
+
+typedef struct {
+  grub_efi_pxe_ip_address_t ip_addr;
+  grub_efi_pxe_mac_address_t mac_addr;
+} grub_efi_pxe_arp_entry_t;
+
+typedef struct {
+  grub_efi_pxe_ip_address_t ip_addr;
+  grub_efi_pxe_ip_address_t subnet_mask;
+  grub_efi_pxe_ip_address_t gw_addr;
+} grub_efi_pxe_route_entry_t;
+
+
+#define GRUB_EFI_PXE_BASE_CODE_MAX_ARP_ENTRIES 8
+#define GRUB_EFI_PXE_BASE_CODE_MAX_ROUTE_ENTRIES 8
 
 typedef struct grub_efi_pxe_mode
 {
-  grub_uint8_t unused[52];
+  grub_efi_boolean_t started;
+  grub_efi_boolean_t ipv6_available;
+  grub_efi_boolean_t ipv6_supported;
+  grub_efi_boolean_t using_ipv6;
+  grub_efi_boolean_t bis_supported;
+  grub_efi_boolean_t bis_detected;
+  grub_efi_boolean_t auto_arp;
+  grub_efi_boolean_t send_guid;
+  grub_efi_boolean_t dhcp_discover_valid;
+  grub_efi_boolean_t dhcp_ack_received;
+  grub_efi_boolean_t proxy_offer_received;
+  grub_efi_boolean_t pxe_discover_valid;
+  grub_efi_boolean_t pxe_reply_received;
+  grub_efi_boolean_t pxe_bis_reply_received;
+  grub_efi_boolean_t icmp_error_received;
+  grub_efi_boolean_t tftp_error_received;
+  grub_efi_boolean_t make_callbacks;
+  grub_efi_uint8_t ttl;
+  grub_efi_uint8_t tos;
+  grub_efi_ip_address_t station_ip;
+  grub_efi_ip_address_t subnet_mask;
   grub_efi_pxe_packet_t dhcp_discover;
   grub_efi_pxe_packet_t dhcp_ack;
   grub_efi_pxe_packet_t proxy_offer;
   grub_efi_pxe_packet_t pxe_discover;
   grub_efi_pxe_packet_t pxe_reply;
+  grub_efi_pxe_packet_t pxe_bis_reply;
+  grub_efi_pxe_ip_filter_t ip_filter;
+  grub_efi_uint32_t arp_cache_entries;
+  grub_efi_pxe_arp_entry_t arp_cache[GRUB_EFI_PXE_BASE_CODE_MAX_ARP_ENTRIES];
+  grub_efi_uint32_t route_table_entries;
+  grub_efi_pxe_route_entry_t 
route_table[GRUB_EFI_PXE_BASE_CODE_MAX_ROUTE_ENTRIES];
+  grub_efi_pxe_icmp_error_t icmp_error;
+  grub_efi_pxe_tftp_error_t tftp_error;
 } grub_efi_pxe_mode_t;
 
 typedef struct grub_efi_pxe
-- 
2.26.2




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