efi_loader: Add network access support

We can now successfully boot EFI applications from disk, but users
may want to also run them from a PXE setup.

This patch implements rudimentary network support, allowing a payload
to send and receive network packets.

With this patch, I was able to successfully run grub2 with network
access inside of QEMU's -M xlnx-ep108.

Signed-off-by: Alexander Graf <agraf@suse.de>

3 files changed, 127 insertions, 1 deletions

diff --git a/include/efi_api.h b/include/efi_api.h
index 51d7586..20035d7 100644
--- a/include/efi_api.h
+++ b/include/efi_api.h
@@ -412,4 +412,123 @@ struct efi_gop
 	struct efi_gop_mode *mode;
 };
 
+#define EFI_SIMPLE_NETWORK_GUID \
+	EFI_GUID(0xa19832b9, 0xac25, 0x11d3, \
+		 0x9a, 0x2d, 0x00, 0x90, 0x27, 0x3f, 0xc1, 0x4d)
+
+struct efi_mac_address {
+	char mac_addr[32];
+};
+
+struct efi_ip_address {
+	u8 ip_addr[16];
+};
+
+enum efi_simple_network_state {
+	EFI_NETWORK_STOPPED,
+	EFI_NETWORK_STARTED,
+	EFI_NETWORK_INITIALIZED,
+};
+
+struct efi_simple_network_mode {
+	enum efi_simple_network_state state;
+	u32 hwaddr_size;
+	u32 media_header_size;
+	u32 max_packet_size;
+	u32 nvram_size;
+	u32 nvram_access_size;
+	u32 receive_filter_mask;
+	u32 receive_filter_setting;
+	u32 max_mcast_filter_count;
+	u32 mcast_filter_count;
+	struct efi_mac_address mcast_filter[16];
+	struct efi_mac_address current_address;
+	struct efi_mac_address broadcast_address;
+	struct efi_mac_address permanent_address;
+	u8 if_type;
+	u8 mac_changeable;
+	u8 multitx_supported;
+	u8 media_present_supported;
+	u8 media_present;
+};
+
+#define EFI_SIMPLE_NETWORK_RECEIVE_UNICAST               0x01,
+#define EFI_SIMPLE_NETWORK_RECEIVE_MULTICAST             0x02,
+#define EFI_SIMPLE_NETWORK_RECEIVE_BROADCAST             0x04,
+#define EFI_SIMPLE_NETWORK_RECEIVE_PROMISCUOUS           0x08,
+#define EFI_SIMPLE_NETWORK_RECEIVE_PROMISCUOUS_MULTICAST 0x10,
+
+struct efi_simple_network
+{
+	u64 revision;
+	efi_status_t (EFIAPI *start)(struct efi_simple_network *this);
+	efi_status_t (EFIAPI *stop)(struct efi_simple_network *this);
+	efi_status_t (EFIAPI *initialize)(struct efi_simple_network *this,
+			ulong extra_rx, ulong extra_tx);
+	efi_status_t (EFIAPI *reset)(struct efi_simple_network *this,
+			int extended_verification);
+	efi_status_t (EFIAPI *shutdown)(struct efi_simple_network *this);
+	efi_status_t (EFIAPI *receive_filters)(struct efi_simple_network *this,
+			u32 enable, u32 disable, int reset_mcast_filter,
+			ulong mcast_filter_count,
+			struct efi_mac_address *mcast_filter);
+	efi_status_t (EFIAPI *station_address)(struct efi_simple_network *this,
+			int reset, struct efi_mac_address *new_mac);
+	efi_status_t (EFIAPI *statistics)(struct efi_simple_network *this,
+			int reset, ulong *stat_size, void *stat_table);
+	efi_status_t (EFIAPI *mcastiptomac)(struct efi_simple_network *this,
+			int ipv6, struct efi_ip_address *ip,
+			struct efi_mac_address *mac);
+	efi_status_t (EFIAPI *nvdata)(struct efi_simple_network *this,
+			int read_write, ulong offset, ulong buffer_size,
+			char *buffer);
+	efi_status_t (EFIAPI *get_status)(struct efi_simple_network *this,
+			u32 *int_status, void **txbuf);
+	efi_status_t (EFIAPI *transmit)(struct efi_simple_network *this,
+			ulong header_size, ulong buffer_size, void *buffer,
+			struct efi_mac_address *src_addr,
+			struct efi_mac_address *dest_addr, u16 *protocol);
+	efi_status_t (EFIAPI *receive)(struct efi_simple_network *this,
+			ulong *header_size, ulong *buffer_size, void *buffer,
+			struct efi_mac_address *src_addr,
+			struct efi_mac_address *dest_addr, u16 *protocol);
+	void (EFIAPI *waitforpacket)(void);
+	struct efi_simple_network_mode *mode;
+};
+
+#define EFI_PXE_GUID \
+	EFI_GUID(0x03c4e603, 0xac28, 0x11d3, \
+		 0x9a, 0x2d, 0x00, 0x90, 0x27, 0x3f, 0xc1, 0x4d)
+
+struct efi_pxe_packet {
+	u8 packet[1472];
+};
+
+struct efi_pxe_mode
+{
+	u8 unused[52];
+	struct efi_pxe_packet dhcp_discover;
+	struct efi_pxe_packet dhcp_ack;
+	struct efi_pxe_packet proxy_offer;
+	struct efi_pxe_packet pxe_discover;
+	struct efi_pxe_packet pxe_reply;
+};
+
+struct efi_pxe {
+	u64 rev;
+	void (EFIAPI *start)(void);
+	void (EFIAPI *stop)(void);
+	void (EFIAPI *dhcp)(void);
+	void (EFIAPI *discover)(void);
+	void (EFIAPI *mftp)(void);
+	void (EFIAPI *udpwrite)(void);
+	void (EFIAPI *udpread)(void);
+	void (EFIAPI *setipfilter)(void);
+	void (EFIAPI *arp)(void);
+	void (EFIAPI *setparams)(void);
+	void (EFIAPI *setstationip)(void);
+	void (EFIAPI *setpackets)(void);
+	struct efi_pxe_mode *mode;
+};
+
 #endif
diff --git a/include/efi_loader.h b/include/efi_loader.h
index 88b8149..8005454 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -91,6 +91,12 @@ extern struct list_head efi_obj_list;
 int efi_disk_register(void);
 /* Called by bootefi to make GOP (graphical) interface available */
 int efi_gop_register(void);
+/* Called by bootefi to make the network interface available */
+int efi_net_register(void **handle);
+
+/* Called by networking code to memorize the dhcp ack package */
+void efi_net_set_dhcp_ack(void *pkt, int len);
+
 /*
  * Stub implementation for a protocol opener that just returns the handle as
  * interface
@@ -157,5 +163,6 @@ static inline void ascii2unicode(u16 *unicode, char *ascii)
 static inline void efi_restore_gd(void) { }
 static inline void efi_set_bootdev(const char *dev, const char *devnr,
 				   const char *path) { }
+static inline void efi_net_set_dhcp_ack(void *pkt, int len) { }
 
 #endif
diff --git a/include/net.h b/include/net.h
index 05800c4..5ee5929 100644
--- a/include/net.h
+++ b/include/net.h
@@ -269,7 +269,7 @@ int eth_getenv_enetaddr_by_index(const char *base_name, int index,
 int eth_init(void);			/* Initialize the device */
 int eth_send(void *packet, int length);	   /* Send a packet */
 
-#ifdef CONFIG_API
+#if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)
 int eth_receive(void *packet, int length); /* Receive a packet*/
 extern void (*push_packet)(void *packet, int length);
 #endif