X-Git-Url: https://git.rohieb.name/openwrt.git/blobdiff_plain/47661d88e6467308c5b17961e1388fb90015b80b..2a6f8ab8cf345e33d515b79207e27eb842c9fc30:/package/busybox/patches/244-udhcpc_add_6rd_option.patch

diff --git a/package/busybox/patches/244-udhcpc_add_6rd_option.patch b/package/busybox/patches/244-udhcpc_add_6rd_option.patch
index 25c5ebf6f..0bf6ff0f4 100644
--- a/package/busybox/patches/244-udhcpc_add_6rd_option.patch
+++ b/package/busybox/patches/244-udhcpc_add_6rd_option.patch
@@ -1,22 +1,24 @@
 --- a/networking/udhcp/common.c
 +++ b/networking/udhcp/common.c
-@@ -54,6 +54,7 @@ const struct dhcp_optflag dhcp_optflags[
+@@ -54,6 +54,8 @@ const struct dhcp_optflag dhcp_optflags[
  	{ OPTION_SIP_SERVERS                      , 0x78 }, /* DHCP_SIP_SERVERS   */
  #endif
  	{ OPTION_STATIC_ROUTES                    , 0x79 }, /* DHCP_STATIC_ROUTES */
-+	{ OPTION_6RD                              , 0xd4 }, /* DHCP_6RD           */
++	{ OPTION_6RD                              , 0xd4 }, /* DHCP_6RD (RFC)     */
++	{ OPTION_6RD                              , 0x96 }, /* DHCP_6RD (Comcast) */
  	{ OPTION_STRING                           , 0xfc }, /* DHCP_WPAD          */
  
  	/* Options below have no match in dhcp_option_strings[],
-@@ -114,6 +115,7 @@ const char dhcp_option_strings[] ALIGN1 
+@@ -114,6 +116,8 @@ const char dhcp_option_strings[] ALIGN1 
  // doesn't work in udhcpd.conf since OPTION_STATIC_ROUTES
  // is not handled yet by "string->option" conversion code:
  	"staticroutes" "\0"/* DHCP_STATIC_ROUTES  */
-+	"ip6rd" "\0"       /* DHCP_6RD            */
++	"ip6rd" "\0"       /* DHCP_6RD (RFC)      */
++	"ip6rd" "\0"       /* DHCP_6RD (Comcast)  */
  	"wpad" "\0"        /* DHCP_WPAD           */
  	;
  
-@@ -141,6 +143,7 @@ const uint8_t dhcp_option_lengths[] ALIG
+@@ -141,6 +145,7 @@ const uint8_t dhcp_option_lengths[] ALIG
  	[OPTION_S32] =     4,
  	/* Just like OPTION_STRING, we use minimum length here */
  	[OPTION_STATIC_ROUTES] = 5,
@@ -58,7 +60,7 @@
  /* really simple implementation, just count the bits */
  static int mton(uint32_t mask)
  {
-@@ -177,6 +195,60 @@ static NOINLINE char *xmalloc_optname_op
+@@ -177,6 +195,70 @@ static NOINLINE char *xmalloc_optname_op
  
  			return ret;
  		}
@@ -85,33 +87,43 @@
 +			 * We convert it to a string "IPv4MaskLen 6rdPrefixLen 6rdPrefix 6rdBRIPv4Address"
 +			 */
 +
-+			/* IPv4MaskLen */
-+			dest += sprintf(dest, "%u ", *option++);
-+			len--;
++			/* Sanity check: ensure that our length is at least 22 bytes, that
++			 * IPv4MaskLen is <= 32, 6rdPrefixLen <= 128 and that the sum of
++			 * (32 - IPv4MaskLen) + 6rdPrefixLen is less than or equal to 128.
++			 * If any of these requirements is not fulfilled, return with empty
++			 * value.
++			 */
++			if ((len >= 22) && (*option <= 32) && (*(option+1) <= 128) &&
++			    (((32 - *option) + *(option+1)) <= 128))
++			{
++				/* IPv4MaskLen */
++				dest += sprintf(dest, "%u ", *option++);
++				len--;
 +
-+			/* 6rdPrefixLen */
-+			dest += sprintf(dest, "%u ", *option++);
-+			len--;
++				/* 6rdPrefixLen */
++				dest += sprintf(dest, "%u ", *option++);
++				len--;
 +
-+			/* 6rdPrefix */
-+			dest += sprint_nip6(dest, "", option);
-+			option += 16;
-+			len -= 16;
++				/* 6rdPrefix */
++				dest += sprint_nip6(dest, "", option);
++				option += 16;
++				len -= 16;
 +
-+			/* 6rdBRIPv4Addresses */
-+			while (len >= 4)
-+			{
-+				dest += sprint_nip(dest, " ", option);
-+				option += 4;
-+				len -= 4;
++				/* 6rdBRIPv4Addresses */
++				while (len >= 4)
++				{
++					dest += sprint_nip(dest, " ", option);
++					option += 4;
++					len -= 4;
 +
-+				/* the code to determine the option size fails to work with
-+				 * lengths that are not a multiple of the minimum length,
-+				 * adding all advertised 6rdBRIPv4Addresses here would
-+				 * overflow the destination buffer, therefore skip the rest
-+				 * for now
-+				 */
-+				break;
++					/* the code to determine the option size fails to work with
++					 * lengths that are not a multiple of the minimum length,
++					 * adding all advertised 6rdBRIPv4Addresses here would
++					 * overflow the destination buffer, therefore skip the rest
++					 * for now
++					 */
++					break;
++				}
 +			}
 +
 +			return ret;