[PATCH 4/4] Add ipv6 support

[Chandra Seetharaman]

This patch adds support for handling ipv6 boot parameters for POWER
architecture.

This is implementation derived.

This follows the semantics defined in section 4.3.1 of
http://www.power.org/apps/org/workgroup/parch/download.php/2380/latest
(It is under the Members area of TSC - Platform Architecture committee).

Signed-off-by: Chandra Seetharaman <sekharan at us.ibm.com>
---
 include/file.h |    5 +++++
 include/prom.h |    1 +
 second/file.c  |   52 +++++++++++++++++++++++++++++++++++++++++++++++++++-
 second/fs_of.c |    8 ++++++--
 4 files changed, 63 insertions(+), 3 deletions(-)

Index: yaboot.git_head/include/file.h
===================================================================
--- yaboot.git_head.orig/include/file.h
+++ yaboot.git_head/include/file.h
@@ -46,6 +46,11 @@ struct boot_fspec_t {
 	char*	bootp_retries;	/* Bootp retries */
 	char*	tftp_retries;	/* TFTP retries */
 	char*	addl_params;	/* copy all additional parameters */
+
+	/* Following fields are used only in ipv6 format */
+	int	is_ipv6;	/* is ipv6 specified ? */
+	char*	dhcpv6;		/* dhcpv6 string */
+	char*	blksize;	/* blksize string */
 };
 
 struct boot_file_t {
Index: yaboot.git_head/include/prom.h
===================================================================
--- yaboot.git_head.orig/include/prom.h
+++ yaboot.git_head/include/prom.h
@@ -37,6 +37,7 @@ typedef void *phandle;
 #define PROM_INVALID_HANDLE	((prom_handle)-1UL)
 #define BOOTDEVSZ               (2048) /* iscsi args can be in excess of 1040 bytes */
 #define TOK_ISCSI               "iscsi"
+#define TOK_IPV6                "ipv6"
 #define PROM_CLAIM_MAX_ADDR	0x8000000
 #define BOOTLASTSZ		1024
 #define FW_NBR_REBOOTSZ		4
Index: yaboot.git_head/second/file.c
===================================================================
--- yaboot.git_head.orig/second/file.c
+++ yaboot.git_head/second/file.c
@@ -132,6 +132,50 @@ extract_ipv4_args(char *imagepath, struc
 }
 
 /*
+ * Extract all the ipv6 arguments from the bootpath provided and fill result
+ * Syntax: ipv6,[dhcpv6[=diaddr,]]ciaddr=c_iaddr,giaddr=g_iaddr,siaddr=s_iaddr,
+ *      filename=file_name,tftp-retries=tftp_retries,blksize=block_size
+ * Returns 1 on success, 0 on failure.
+ */
+static int
+extract_ipv6_args(char *imagepath, struct boot_fspec_t *result)
+{
+     char *str, *tmp;
+     int total_len;
+
+     result->is_ipv6 = 1;
+
+     /* Just allocate the max required size */
+     total_len = strlen(imagepath) + 1;
+     str = malloc(total_len);
+     if (!str)
+	return 0;
+
+     if ((tmp = strstr(imagepath, "dhcpv6=")) != NULL)
+	result->dhcpv6 = scopy(&str, &tmp);
+
+     if ((tmp = strstr(imagepath, "ciaddr=")) != NULL)
+	result->ciaddr = scopy(&str, &tmp);
+
+     if ((tmp = strstr(imagepath, "giaddr=")) != NULL)
+	result->giaddr = scopy(&str, &tmp);
+
+     if ((tmp = strstr(imagepath, "siaddr=")) != NULL)
+	result->siaddr = scopy(&str, &tmp);
+
+     if ((tmp = strstr(imagepath, "filename=")) != NULL)
+	result->file = scopy(&str, &tmp);
+
+     if ((tmp = strstr(imagepath, "tftp-retries=")) != NULL)
+	result->tftp_retries = scopy(&str, &tmp);
+
+     if ((tmp = strstr(imagepath, "blksize=")) != NULL)
+	result->blksize = scopy(&str, &tmp);
+
+     return 1;
+}
+
+/*
  * Extract all the arguments provided in the imagepath and fill it in result.
  * Returns 1 on success, 0 on failure.
  */
@@ -145,8 +189,12 @@ extract_args_from_netdev_path(char *imag
      if (!imagepath)
 	  return 1;
 
-     ret = extract_ipv4_args(imagepath, result);
+     if (strstr(imagepath, TOK_IPV6))
+	  ret = extract_ipv6_args(imagepath, result);
+     else
+	  ret = extract_ipv4_args(imagepath, result);
 
+     DEBUG_F("ipv6 = <%d>\n", result->is_ipv6);
      DEBUG_F("siaddr = <%s>\n", result->siaddr);
      DEBUG_F("file = <%s>\n", result->file);
      DEBUG_F("ciaddr = <%s>\n", result->ciaddr);
@@ -154,6 +202,8 @@ extract_args_from_netdev_path(char *imag
      DEBUG_F("bootp_retries = <%s>\n", result->bootp_retries);
      DEBUG_F("tftp_retries = <%s>\n", result->tftp_retries);
      DEBUG_F("addl_params = <%s>\n", result->addl_params);
+     DEBUG_F("dhcpv6 = <%s>\n", result->dhcpv6);
+     DEBUG_F("blksize = <%s>\n", result->blksize);
      return ret;
 }
 
Index: yaboot.git_head/second/fs_of.c
===================================================================
--- yaboot.git_head.orig/second/fs_of.c
+++ yaboot.git_head/second/fs_of.c
@@ -148,11 +148,15 @@ of_net_open(struct boot_file_t* file,
 		    *p = '\\';
      }
 
-     DEBUG_F("siaddr <%s>; filename <%s>; ciaddr <%s>; giaddr <%s>;\n",
-		fspec->siaddr, filename, fspec->ciaddr, fspec->giaddr);
+     DEBUG_F("siaddr <%s>; filename <%s>; ciaddr <%s>; giaddr <%s>; ipv6 <%d>\n",
+		fspec->siaddr, filename, fspec->ciaddr, fspec->giaddr, fspec->is_ipv6);
      strncpy(buffer, fspec->dev, 768);
+     if (fspec->is_ipv6)
+	  strcat(buffer, TOK_IPV6 ",");
      strcat(buffer, fspec->siaddr);
      strcat(buffer, ",");
+     if (fspec->is_ipv6 && (strstr(filename, "filename=") == NULL))
+	  strcat(buffer, "filename=");
      strcat(buffer, filename);
      strcat(buffer, ",");
      strcat(buffer, fspec->ciaddr);