--- /dev/null
- o.packet_size = grub_pxe_blksize;
+/* pxe.c - Driver to provide access to the pxe filesystem */
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2008,2009 Free Software Foundation, Inc.
+ *
+ * GRUB is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GRUB is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/dl.h>
+#include <grub/net.h>
+#include <grub/mm.h>
+#include <grub/file.h>
+#include <grub/misc.h>
+#include <grub/bufio.h>
+#include <grub/env.h>
+
+#include <grub/machine/pxe.h>
+#include <grub/machine/int.h>
+#include <grub/machine/memory.h>
+
+#define SEGMENT(x) ((x) >> 4)
+#define OFFSET(x) ((x) & 0xF)
+#define SEGOFS(x) ((SEGMENT(x) << 16) + OFFSET(x))
+#define LINEAR(x) (void *) (((x >> 16) << 4) + (x & 0xFFFF))
+
+struct grub_pxe_bangpxe *grub_pxe_pxenv;
+static grub_uint32_t grub_pxe_default_server_ip;
+#if 0
+static grub_uint32_t grub_pxe_default_gateway_ip;
+#endif
+static unsigned grub_pxe_blksize = GRUB_PXE_MIN_BLKSIZE;
+static grub_uint32_t pxe_rm_entry = 0;
+static grub_file_t curr_file = 0;
+
+struct grub_pxe_data
+{
+ grub_uint32_t packet_number;
+ grub_uint32_t block_size;
+ grub_uint32_t server_ip;
+ grub_uint32_t gateway_ip;
+ char filename[0];
+};
+
+
+static struct grub_pxe_bangpxe *
+grub_pxe_scan (void)
+{
+ struct grub_bios_int_registers regs;
+ struct grub_pxenv *pxenv;
+ struct grub_pxe_bangpxe *bangpxe;
+
+ regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
+
+ regs.ebx = 0;
+ regs.ecx = 0;
+ regs.eax = 0x5650;
+ regs.es = 0;
+
+ grub_bios_interrupt (0x1a, ®s);
+
+ if ((regs.eax & 0xffff) != 0x564e)
+ return NULL;
+
+ pxenv = (struct grub_pxenv *) ((regs.es << 4) + (regs.ebx & 0xffff));
+ if (grub_memcmp (pxenv->signature, GRUB_PXE_SIGNATURE,
+ sizeof (pxenv->signature))
+ != 0)
+ return NULL;
+
+ if (pxenv->version < 0x201)
+ return NULL;
+
+ bangpxe = (void *) ((((pxenv->pxe_ptr & 0xffff0000) >> 16) << 4)
+ + (pxenv->pxe_ptr & 0xffff));
+
+ if (!bangpxe)
+ return NULL;
+
+ if (grub_memcmp (bangpxe->signature, GRUB_PXE_BANGPXE_SIGNATURE,
+ sizeof (bangpxe->signature)) != 0)
+ return NULL;
+
+ pxe_rm_entry = bangpxe->rm_entry;
+
+ return bangpxe;
+}
+
+static grub_err_t
+grub_pxefs_dir (grub_device_t device __attribute__ ((unused)),
+ const char *path __attribute__ ((unused)),
+ int (*hook) (const char *filename,
+ const struct grub_dirhook_info *info)
+ __attribute__ ((unused)))
+{
+ return GRUB_ERR_NONE;
+}
+
+static grub_err_t
+grub_pxefs_open (struct grub_file *file, const char *name)
+{
+ union
+ {
+ struct grub_pxenv_tftp_get_fsize c1;
+ struct grub_pxenv_tftp_open c2;
+ } c;
+ struct grub_pxe_data *data;
+ grub_file_t file_int, bufio;
+
+ data = grub_malloc (sizeof (*data));
+ if (!data)
+ return grub_errno;
+
+ {
+ grub_net_network_level_address_t addr;
+ grub_net_network_level_address_t gateway;
+ struct grub_net_network_level_interface *interf;
+ grub_err_t err;
+
+ if (grub_strncmp (file->device->net->name,
+ "pxe,", sizeof ("pxe,") - 1) == 0
+ || grub_strncmp (file->device->net->name,
+ "pxe:", sizeof ("pxe:") - 1) == 0)
+ {
+ err = grub_net_resolve_address (file->device->net->name
+ + sizeof ("pxe,") - 1, &addr);
+ if (err)
+ return err;
+ }
+ else
+ {
+ addr.ipv4 = grub_pxe_default_server_ip;
+ addr.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4;
+ }
+ err = grub_net_route_address (addr, &gateway, &interf);
+ if (err)
+ return err;
+ data->server_ip = addr.ipv4;
+ data->gateway_ip = gateway.ipv4;
+ }
+
+ if (curr_file != 0)
+ {
+ grub_pxe_call (GRUB_PXENV_TFTP_CLOSE, &c.c2, pxe_rm_entry);
+ curr_file = 0;
+ }
+
+ c.c1.server_ip = data->server_ip;
+ c.c1.gateway_ip = data->gateway_ip;
+ grub_strcpy ((char *)&c.c1.filename[0], name);
+ grub_pxe_call (GRUB_PXENV_TFTP_GET_FSIZE, &c.c1, pxe_rm_entry);
+ if (c.c1.status)
+ return grub_error (GRUB_ERR_FILE_NOT_FOUND, "file not found");
+
+ file->size = c.c1.file_size;
+
+ c.c2.tftp_port = grub_cpu_to_be16 (GRUB_PXE_TFTP_PORT);
+ c.c2.packet_size = grub_pxe_blksize;
+ grub_pxe_call (GRUB_PXENV_TFTP_OPEN, &c.c2, pxe_rm_entry);
+ if (c.c2.status)
+ return grub_error (GRUB_ERR_BAD_FS, "open fails");
+
+ data = grub_zalloc (sizeof (struct grub_pxe_data) + grub_strlen (name) + 1);
+ if (! data)
+ return grub_errno;
+
+ data->block_size = c.c2.packet_size;
+ grub_strcpy (data->filename, name);
+
+ file_int = grub_malloc (sizeof (*file_int));
+ if (! file_int)
+ {
+ grub_free (data);
+ return grub_errno;
+ }
+
+ file->data = data;
++ file->not_easly_seekable = 1;
+ grub_memcpy (file_int, file, sizeof (struct grub_file));
+ curr_file = file_int;
+
+ bufio = grub_bufio_open (file_int, data->block_size);
+ if (! bufio)
+ {
+ grub_free (file_int);
+ grub_free (data);
+ return grub_errno;
+ }
+
+ grub_memcpy (file, bufio, sizeof (struct grub_file));
+
+ return GRUB_ERR_NONE;
+}
+
+static grub_ssize_t
+grub_pxefs_read (grub_file_t file, char *buf, grub_size_t len)
+{
+ struct grub_pxenv_tftp_read c;
+ struct grub_pxe_data *data;
+ grub_uint32_t pn, r;
+
+ data = file->data;
+
+ pn = grub_divmod64 (file->offset, data->block_size, &r);
+ if (r)
+ {
+ grub_error (GRUB_ERR_BAD_FS,
+ "read access must be aligned to packet size");
+ return -1;
+ }
+
+ if ((curr_file != file) || (data->packet_number > pn))
+ {
+ struct grub_pxenv_tftp_open o;
+
+ if (curr_file != 0)
+ grub_pxe_call (GRUB_PXENV_TFTP_CLOSE, &o, pxe_rm_entry);
+
+ o.server_ip = data->server_ip;
+ o.gateway_ip = data->gateway_ip;
+ grub_strcpy ((char *)&o.filename[0], data->filename);
+ o.tftp_port = grub_cpu_to_be16 (GRUB_PXE_TFTP_PORT);
++ o.packet_size = data->block_size;
+ grub_pxe_call (GRUB_PXENV_TFTP_OPEN, &o, pxe_rm_entry);
+ if (o.status)
+ {
+ grub_error (GRUB_ERR_BAD_FS, "open fails");
+ return -1;
+ }
+ data->block_size = o.packet_size;
+ data->packet_number = 0;
+ curr_file = file;
+ }
+
+ c.buffer = SEGOFS (GRUB_MEMORY_MACHINE_SCRATCH_ADDR);
+ while (pn >= data->packet_number)
+ {
+ c.buffer_size = data->block_size;
+ grub_pxe_call (GRUB_PXENV_TFTP_READ, &c, pxe_rm_entry);
+ if (c.status)
+ {
+ grub_error (GRUB_ERR_BAD_FS, "read fails");
+ return -1;
+ }
+ data->packet_number++;
+ }
+
+ grub_memcpy (buf, (char *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR, len);
+
+ return len;
+}
+
+static grub_err_t
+grub_pxefs_close (grub_file_t file)
+{
+ struct grub_pxenv_tftp_close c;
+
+ if (curr_file == file)
+ {
+ grub_pxe_call (GRUB_PXENV_TFTP_CLOSE, &c, pxe_rm_entry);
+ curr_file = 0;
+ }
+
+ grub_free (file->data);
+
+ return GRUB_ERR_NONE;
+}
+
+static grub_err_t
+grub_pxefs_label (grub_device_t device __attribute ((unused)),
+ char **label __attribute ((unused)))
+{
+ *label = 0;
+ return GRUB_ERR_NONE;
+}
+
+static struct grub_fs grub_pxefs_fs =
+ {
+ .name = "pxe",
+ .dir = grub_pxefs_dir,
+ .open = grub_pxefs_open,
+ .read = grub_pxefs_read,
+ .close = grub_pxefs_close,
+ .label = grub_pxefs_label,
+ .next = 0
+ };
+
+static grub_size_t
+grub_pxe_recv (struct grub_net_card *dev __attribute__ ((unused)),
+ struct grub_net_buff *buf __attribute__ ((unused)))
+{
+ return 0;
+}
+
+static grub_err_t
+grub_pxe_send (struct grub_net_card *dev __attribute__ ((unused)),
+ struct grub_net_buff *buf __attribute__ ((unused)))
+{
+ return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET, "not implemented");
+}
+
+struct grub_net_card_driver grub_pxe_card_driver =
+{
+ .send = grub_pxe_send,
+ .recv = grub_pxe_recv
+};
+
+struct grub_net_card grub_pxe_card =
+{
+ .driver = &grub_pxe_card_driver,
+ .name = "pxe"
+};
+
+void
+grub_pxe_unload (void)
+{
+ if (grub_pxe_pxenv)
+ {
+ grub_net_app_level_unregister (&grub_pxefs_fs);
+ grub_net_card_unregister (&grub_pxe_card);
+ grub_pxe_pxenv = 0;
+ }
+}
+
+static void
+set_ip_env (char *varname, grub_uint32_t ip)
+{
+ char buf[GRUB_NET_MAX_STR_ADDR_LEN];
+ grub_net_network_level_address_t addr;
+ addr.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4;
+ addr.ipv4 = ip;
+
+ grub_net_addr_to_str (&addr, buf);
+ grub_env_set (varname, buf);
+}
+
+static char *
+write_ip_env (grub_uint32_t *ip, const char *val)
+{
+ char *buf;
+ grub_err_t err;
+ grub_net_network_level_address_t addr;
+
+ err = grub_net_resolve_address (val, &addr);
+ if (err)
+ return 0;
+ if (addr.type != GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4)
+ return NULL;
+
+ /* Normalize the IP. */
+ buf = grub_malloc (GRUB_NET_MAX_STR_ADDR_LEN);
+ if (!buf)
+ return 0;
+ grub_net_addr_to_str (&addr, buf);
+
+ *ip = addr.ipv4;
+
+ return buf;
+}
+
+static char *
+grub_env_write_pxe_default_server (struct grub_env_var *var
+ __attribute__ ((unused)),
+ const char *val)
+{
+ return write_ip_env (&grub_pxe_default_server_ip, val);
+}
+
+#if 0
+static char *
+grub_env_write_pxe_default_gateway (struct grub_env_var *var
+ __attribute__ ((unused)),
+ const char *val)
+{
+ return write_ip_env (&grub_pxe_default_gateway_ip, val);
+}
+#endif
+
+static char *
+grub_env_write_pxe_blocksize (struct grub_env_var *var __attribute__ ((unused)),
+ const char *val)
+{
+ unsigned size;
+ char *buf;
+
+ size = grub_strtoul (val, 0, 0);
+ if (grub_errno)
+ return 0;
+
+ if (size < GRUB_PXE_MIN_BLKSIZE)
+ size = GRUB_PXE_MIN_BLKSIZE;
+ else if (size > GRUB_PXE_MAX_BLKSIZE)
+ size = GRUB_PXE_MAX_BLKSIZE;
+
+ buf = grub_xasprintf ("%d", size);
+ if (!buf)
+ return 0;
+
+ grub_pxe_blksize = size;
+
+ return buf;
+}
+
+GRUB_MOD_INIT(pxe)
+{
+ struct grub_pxe_bangpxe *pxenv;
+ struct grub_pxenv_get_cached_info ci;
+ struct grub_net_bootp_ack *bp;
+ char *buf;
+
+ pxenv = grub_pxe_scan ();
+ if (! pxenv)
+ return;
+
+ ci.packet_type = GRUB_PXENV_PACKET_TYPE_DHCP_ACK;
+ ci.buffer = 0;
+ ci.buffer_size = 0;
+ grub_pxe_call (GRUB_PXENV_GET_CACHED_INFO, &ci, pxe_rm_entry);
+ if (ci.status)
+ return;
+
+ bp = LINEAR (ci.buffer);
+
+ grub_pxe_default_server_ip = bp->server_ip;
+ grub_pxe_pxenv = pxenv;
+
+ set_ip_env ("pxe_default_server", grub_pxe_default_server_ip);
+ grub_register_variable_hook ("pxe_default_server", 0,
+ grub_env_write_pxe_default_server);
+
+#if 0
+ grub_pxe_default_gateway_ip = bp->gateway_ip;
+
+ grub_register_variable_hook ("pxe_default_gateway", 0,
+ grub_env_write_pxe_default_gateway);
+#endif
+
+ buf = grub_xasprintf ("%d", grub_pxe_blksize);
+ if (buf)
+ grub_env_set ("pxe_blksize", buf);
+ grub_free (buf);
+
+ grub_register_variable_hook ("pxe_blksize", 0,
+ grub_env_write_pxe_blocksize);
+
+ grub_memcpy (grub_pxe_card.default_address.mac, bp->mac_addr,
+ bp->hw_len < sizeof (grub_pxe_card.default_address.mac)
+ ? bp->hw_len : sizeof (grub_pxe_card.default_address.mac));
+ grub_pxe_card.default_address.type = GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET;
+
+ grub_net_app_level_register (&grub_pxefs_fs);
+ grub_net_card_register (&grub_pxe_card);
+ grub_net_configure_by_dhcp_ack ("pxe", &grub_pxe_card,
+ GRUB_NET_INTERFACE_PERMANENT
+ | GRUB_NET_INTERFACE_ADDRESS_IMMUTABLE
+ | GRUB_NET_INTERFACE_HWADDRESS_IMMUTABLE,
+ bp, GRUB_PXE_BOOTP_SIZE);
+}
+
+GRUB_MOD_FINI(pxe)
+{
+ grub_pxe_unload ();
+}
projects / grub2.git / commitdiff