--- /dev/null
+/*
+ * netboot - trivial UEFI first-stage bootloader netboot support
+ *
+ * Copyright 2012 Red Hat, Inc <mjg@redhat.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Significant portions of this code are derived from Tianocore
+ * (http://tianocore.sf.net) and are Copyright 2009-2012 Intel
+ * Corporation.
+ */
+
+#include <efi.h>
+#include <efilib.h>
+#include <string.h>
+#include "shim.h"
+#include "netboot.h"
+
+
+static inline unsigned short int __swap16(unsigned short int x)
+{
+ __asm__("xchgb %b0,%h0"
+ : "=q" (x)
+ : "0" (x));
+ return x;
+}
+
+#define ntohs(x) __swap16(x)
+#define htons(x) ntohs(x)
+
+static EFI_PXE_BASE_CODE *pxe;
+static EFI_IP_ADDRESS tftp_addr;
+static UINT8 *full_path;
+
+
+typedef struct {
+ UINT16 OpCode;
+ UINT16 Length;
+ UINT8 Data[1];
+} EFI_DHCP6_PACKET_OPTION;
+
+/*
+ * usingNetboot
+ * Returns TRUE if we identify a protocol that is enabled and Providing us with
+ * the needed information to fetch a grubx64.efi image
+ */
+BOOLEAN findNetboot(EFI_HANDLE image_handle)
+{
+ UINTN bs = sizeof(EFI_HANDLE);
+ EFI_GUID pxe_base_code_protocol = EFI_PXE_BASE_CODE_PROTOCOL;
+ EFI_HANDLE *hbuf;
+ BOOLEAN rc = FALSE;
+ void *buffer = AllocatePool(bs);
+ UINTN errcnt = 0;
+ UINTN i;
+ EFI_STATUS status;
+
+ if (!buffer)
+ return FALSE;
+
+try_again:
+ status = uefi_call_wrapper(BS->LocateHandle,5, ByProtocol,
+ &pxe_base_code_protocol, NULL, &bs,
+ buffer);
+
+ if (status == EFI_BUFFER_TOO_SMALL) {
+ errcnt++;
+ FreePool(buffer);
+ if (errcnt > 1)
+ return FALSE;
+ buffer = AllocatePool(bs);
+ if (!buffer)
+ return FALSE;
+ goto try_again;
+ }
+
+ if (status == EFI_NOT_FOUND) {
+ FreePool(buffer);
+ return FALSE;
+ }
+
+ /*
+ * We have a list of pxe supporting protocols, lets see if any are
+ * active
+ */
+ hbuf = buffer;
+ pxe = NULL;
+ for (i=0; i < (bs / sizeof(EFI_HANDLE)); i++) {
+ status = uefi_call_wrapper(BS->OpenProtocol, 6, hbuf[i],
+ &pxe_base_code_protocol,
+ (void **)&pxe, image_handle, NULL,
+ EFI_OPEN_PROTOCOL_GET_PROTOCOL);
+
+ if (status != EFI_SUCCESS) {
+ pxe = NULL;
+ continue;
+ }
+
+ if (!pxe || !pxe->Mode) {
+ pxe = NULL;
+ continue;
+ }
+
+ if (pxe->Mode->Started && pxe->Mode->DhcpAckReceived) {
+ /*
+ * We've located a pxe protocol handle thats been
+ * started and has received an ACK, meaning its
+ * something we'll be able to get tftp server info
+ * out of
+ */
+ rc = TRUE;
+ break;
+ }
+
+ }
+
+ FreePool(buffer);
+ return rc;
+}
+
+static char *get_v6_bootfile_url(EFI_PXE_BASE_CODE_DHCPV6_PACKET *pkt)
+{
+ void *optr;
+ EFI_DHCP6_PACKET_OPTION *option;
+ char *url;
+ UINT32 urllen;
+
+ optr = pkt->DhcpOptions;
+
+ for(;;) {
+ option = (EFI_DHCP6_PACKET_OPTION *)optr;
+
+ if (ntohs(option->OpCode) == 0)
+ return NULL;
+
+ if (ntohs(option->OpCode) == 59) {
+ /* This is the bootfile url option */
+ urllen = ntohs(option->Length);
+ url = AllocatePool(urllen+2);
+ if (!url)
+ return NULL;
+ memset(url, 0, urllen+2);
+ memcpy(url, option->Data, urllen);
+ return url;
+ }
+ optr += 4 + ntohs(option->Length);
+ }
+
+ return NULL;
+}
+
+static UINT16 str2ns(UINT8 *str)
+{
+ UINT16 ret = 0;
+ UINT8 v;
+ for(;*str;str++) {
+ if ('0' <= *str && *str <= '9')
+ v = *str - '0';
+ else if ('A' <= *str && *str <= 'F')
+ v = *str - 'A' + 10;
+ else if ('a' <= *str && *str <= 'f')
+ v = *str - 'a' + 10;
+ else
+ v = 0;
+ ret = (ret << 4) + v;
+ }
+ return htons(ret);
+}
+
+static UINT8 *str2ip6(char *str)
+{
+ UINT8 i, j, p;
+ size_t len;
+ UINT8 *a, *b, t;
+ static UINT16 ip[8];
+
+ for(i=0; i < 8; i++) {
+ ip[i] = 0;
+ }
+ len = strlen((UINT8 *)str);
+ a = b = (UINT8 *)str;
+ for(i=p=0; i < len; i++, b++) {
+ if (*b != ':')
+ continue;
+ *b = '\0';
+ ip[p++] = str2ns(a);
+ *b = ':';
+ a = b + 1;
+ if ( *(b+1) == ':' )
+ break;
+ }
+ a = b = (UINT8 *)(str + len);
+ for(j=len, p=7; j > i; j--, a--) {
+ if (*a != ':')
+ continue;
+ t = *b;
+ *b = '\0';
+ ip[p--] = str2ns(a+1);
+ *b = t;
+ b = a;
+ }
+ return (UINT8 *)ip;
+}
+
+static BOOLEAN extract_tftp_info(char *url)
+{
+ CHAR8 *start, *end;
+ char ip6str[128];
+ CHAR8 *template = (CHAR8 *)"/grubx64.efi";
+
+ if (strncmp((UINT8 *)url, (UINT8 *)"tftp://", 7)) {
+ Print(L"URLS MUST START WITH tftp://\n");
+ return FALSE;
+ }
+ start = (CHAR8 *)url + 7;
+ if (*start != '[') {
+ Print(L"TFTP SERVER MUST BE ENCLOSED IN [..]\n");
+ return FALSE;
+ }
+
+ start++;
+ end = start;
+ while ((*end != '\0') && (*end != ']')) {
+ end++;
+ }
+ if (end == '\0') {
+ Print(L"TFTP SERVER MUST BE ENCLOSED IN [..]\n");
+ return FALSE;
+ }
+ memset(ip6str, 0, 128);
+ memcpy(ip6str, start, end - start);
+ end++;
+ memcpy(&tftp_addr.v6, str2ip6(ip6str), 16);
+ full_path = AllocateZeroPool(strlen(end)+strlen(template)+1);
+ if (!full_path)
+ return FALSE;
+ memcpy(full_path, end, strlen(end));
+ end = (CHAR8 *)strrchr((char *)full_path, '/');
+ if (!end)
+ end = (CHAR8 *)full_path;
+ memcpy(end, template, strlen(template));
+ end[strlen(template)] = '\0';
+
+ return TRUE;
+}
+
+static EFI_STATUS parseDhcp6()
+{
+ EFI_PXE_BASE_CODE_DHCPV6_PACKET *packet = (EFI_PXE_BASE_CODE_DHCPV6_PACKET *)&pxe->Mode->DhcpAck.Raw;
+ char *bootfile_url;
+
+
+ bootfile_url = get_v6_bootfile_url(packet);
+ if (extract_tftp_info(bootfile_url) == FALSE)
+ return EFI_NOT_FOUND;
+ if (!bootfile_url)
+ return EFI_NOT_FOUND;
+ return EFI_SUCCESS;
+}
+
+static EFI_STATUS parseDhcp4()
+{
+ CHAR8 *template = (CHAR8 *)"/grubx64.efi";
+ full_path = AllocateZeroPool(strlen(template)+1);
+
+ if (!full_path)
+ return EFI_OUT_OF_RESOURCES;
+
+ memcpy(&tftp_addr.v4, pxe->Mode->DhcpAck.Dhcpv4.BootpSiAddr, 4);
+
+ memcpy(full_path, template, strlen(template));
+
+ /* Note we don't capture the filename option here because we know its shim.efi
+ * We instead assume the filename at the end of the path is going to be grubx64.efi
+ */
+ return EFI_SUCCESS;
+}
+
+EFI_STATUS parseNetbootinfo(EFI_HANDLE image_handle)
+{
+
+ EFI_STATUS rc;
+
+ if (!pxe)
+ return EFI_NOT_READY;
+
+ memset((UINT8 *)&tftp_addr, 0, sizeof(tftp_addr));
+
+ /*
+ * If we've discovered an active pxe protocol figure out
+ * if its ipv4 or ipv6
+ */
+ if (pxe->Mode->UsingIpv6){
+ rc = parseDhcp6();
+ } else
+ rc = parseDhcp4();
+ return rc;
+}
+
+EFI_STATUS FetchNetbootimage(EFI_HANDLE image_handle, VOID **buffer, UINT64 *bufsiz)
+{
+ EFI_STATUS rc;
+ EFI_PXE_BASE_CODE_TFTP_OPCODE read = EFI_PXE_BASE_CODE_TFTP_READ_FILE;
+ BOOLEAN overwrite = FALSE;
+ BOOLEAN nobuffer = FALSE;
+ UINTN blksz = 512;
+
+ Print(L"Fetching Netboot Image\n");
+ if (*buffer == NULL) {
+ *buffer = AllocatePool(4096 * 1024);
+ if (!*buffer)
+ return EFI_OUT_OF_RESOURCES;
+ *bufsiz = 4096 * 1024;
+ }
+
+try_again:
+ rc = uefi_call_wrapper(pxe->Mtftp, 10, pxe, read, *buffer, overwrite,
+ bufsiz, &blksz, &tftp_addr, full_path, NULL, nobuffer);
+
+ if (rc == EFI_BUFFER_TOO_SMALL) {
+ /* try again, doubling buf size */
+ *bufsiz *= 2;
+ FreePool(*buffer);
+ *buffer = AllocatePool(*bufsiz);
+ if (!*buffer)
+ return EFI_OUT_OF_RESOURCES;
+ goto try_again;
+ }
+
+ return rc;
+
+}
--- /dev/null
+Description: roll-up of miscellaneous fixes to the netboot code
+ Pull of various fixes from
+ <https://github.com/vorlonofportland/shim/tree/netboot-cleanup>, currently
+ awaiting merge upstream.
+Author: Steve Langasek <steve.langasek@ubuntu.com>
+
+Index: shim/netboot.c
+===================================================================
+--- shim.orig/netboot.c
++++ shim/netboot.c
+@@ -141,11 +141,11 @@
+ return rc;
+ }
+
+-static char *get_v6_bootfile_url(EFI_PXE_BASE_CODE_DHCPV6_PACKET *pkt)
++static CHAR8 *get_v6_bootfile_url(EFI_PXE_BASE_CODE_DHCPV6_PACKET *pkt)
+ {
+ void *optr;
+ EFI_DHCP6_PACKET_OPTION *option;
+- char *url;
++ CHAR8 *url;
+ UINT32 urllen;
+
+ optr = pkt->DhcpOptions;
+@@ -159,10 +159,9 @@
+ if (ntohs(option->OpCode) == 59) {
+ /* This is the bootfile url option */
+ urllen = ntohs(option->Length);
+- url = AllocatePool(urllen+2);
++ url = AllocateZeroPool(urllen+1);
+ if (!url)
+ return NULL;
+- memset(url, 0, urllen+2);
+ memcpy(url, option->Data, urllen);
+ return url;
+ }
+@@ -225,17 +224,17 @@
+ return (UINT8 *)ip;
+ }
+
+-static BOOLEAN extract_tftp_info(char *url)
++static BOOLEAN extract_tftp_info(CHAR8 *url)
+ {
+ CHAR8 *start, *end;
+- char ip6str[128];
++ char ip6str[40];
+ CHAR8 *template = (CHAR8 *)"/grubx64.efi";
+
+ if (strncmp((UINT8 *)url, (UINT8 *)"tftp://", 7)) {
+ Print(L"URLS MUST START WITH tftp://\n");
+ return FALSE;
+ }
+- start = (CHAR8 *)url + 7;
++ start = url + 7;
+ if (*start != '[') {
+ Print(L"TFTP SERVER MUST BE ENCLOSED IN [..]\n");
+ return FALSE;
+@@ -245,12 +244,16 @@
+ end = start;
+ while ((*end != '\0') && (*end != ']')) {
+ end++;
++ if (end - start > 39) {
++ Print(L"TFTP URL includes malformed IPv6 address\n");
++ return FALSE;
++ }
+ }
+ if (end == '\0') {
+ Print(L"TFTP SERVER MUST BE ENCLOSED IN [..]\n");
+ return FALSE;
+ }
+- memset(ip6str, 0, 128);
++ memset(ip6str, 0, 40);
+ memcpy(ip6str, start, end - start);
+ end++;
+ memcpy(&tftp_addr.v6, str2ip6(ip6str), 16);
+@@ -270,14 +273,16 @@
+ static EFI_STATUS parseDhcp6()
+ {
+ EFI_PXE_BASE_CODE_DHCPV6_PACKET *packet = (EFI_PXE_BASE_CODE_DHCPV6_PACKET *)&pxe->Mode->DhcpAck.Raw;
+- char *bootfile_url;
+-
++ CHAR8 *bootfile_url;
+
+ bootfile_url = get_v6_bootfile_url(packet);
+- if (extract_tftp_info(bootfile_url) == FALSE)
+- return EFI_NOT_FOUND;
+ if (!bootfile_url)
+ return EFI_NOT_FOUND;
++ if (extract_tftp_info(bootfile_url) == FALSE) {
++ FreePool(bootfile_url);
++ return EFI_NOT_FOUND;
++ }
++ FreePool(bootfile_url);
+ return EFI_SUCCESS;
+ }
+
+@@ -350,6 +355,8 @@
+ goto try_again;
+ }
+
++ if (rc != EFI_SUCCESS && *buffer) {
++ FreePool(*buffer);
++ }
+ return rc;
+-
+ }
return rc;
}
-static char *get_v6_bootfile_url(EFI_PXE_BASE_CODE_DHCPV6_PACKET *pkt)
+static CHAR8 *get_v6_bootfile_url(EFI_PXE_BASE_CODE_DHCPV6_PACKET *pkt)
{
void *optr;
EFI_DHCP6_PACKET_OPTION *option;
- char *url;
+ CHAR8 *url;
UINT32 urllen;
optr = pkt->DhcpOptions;
if (ntohs(option->OpCode) == 59) {
/* This is the bootfile url option */
urllen = ntohs(option->Length);
- url = AllocatePool(urllen+2);
+ url = AllocateZeroPool(urllen+1);
if (!url)
return NULL;
- memset(url, 0, urllen+2);
memcpy(url, option->Data, urllen);
return url;
}
return (UINT8 *)ip;
}
-static BOOLEAN extract_tftp_info(char *url)
+static BOOLEAN extract_tftp_info(CHAR8 *url)
{
CHAR8 *start, *end;
- char ip6str[128];
+ char ip6str[40];
CHAR8 *template = (CHAR8 *)"/grubx64.efi";
if (strncmp((UINT8 *)url, (UINT8 *)"tftp://", 7)) {
Print(L"URLS MUST START WITH tftp://\n");
return FALSE;
}
- start = (CHAR8 *)url + 7;
+ start = url + 7;
if (*start != '[') {
Print(L"TFTP SERVER MUST BE ENCLOSED IN [..]\n");
return FALSE;
end = start;
while ((*end != '\0') && (*end != ']')) {
end++;
+ if (end - start > 39) {
+ Print(L"TFTP URL includes malformed IPv6 address\n");
+ return FALSE;
+ }
}
if (end == '\0') {
Print(L"TFTP SERVER MUST BE ENCLOSED IN [..]\n");
return FALSE;
}
- memset(ip6str, 0, 128);
+ memset(ip6str, 0, 40);
memcpy(ip6str, start, end - start);
end++;
memcpy(&tftp_addr.v6, str2ip6(ip6str), 16);
static EFI_STATUS parseDhcp6()
{
EFI_PXE_BASE_CODE_DHCPV6_PACKET *packet = (EFI_PXE_BASE_CODE_DHCPV6_PACKET *)&pxe->Mode->DhcpAck.Raw;
- char *bootfile_url;
-
+ CHAR8 *bootfile_url;
bootfile_url = get_v6_bootfile_url(packet);
- if (extract_tftp_info(bootfile_url) == FALSE)
- return EFI_NOT_FOUND;
if (!bootfile_url)
return EFI_NOT_FOUND;
+ if (extract_tftp_info(bootfile_url) == FALSE) {
+ FreePool(bootfile_url);
+ return EFI_NOT_FOUND;
+ }
+ FreePool(bootfile_url);
return EFI_SUCCESS;
}
goto try_again;
}
+ if (rc != EFI_SUCCESS && *buffer) {
+ FreePool(*buffer);
+ }
return rc;
-
}
projects / efi-boot-shim.git / commitdiff