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diff --git a/networking/udhcp/common.c b/networking/udhcp/common.c
index 0a60261..eaf2b4b 100644
--- a/networking/udhcp/common.c
+++ b/networking/udhcp/common.c
@@ -56,6 +56,8 @@ const struct dhcp_optflag dhcp_optflags[] = {
#endif
{ OPTION_STATIC_ROUTES , 0x79 }, /* DHCP_STATIC_ROUTES */
{ OPTION_STATIC_ROUTES , 0xf9 }, /* DHCP_MS_STATIC_ROUTES */
+ { 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[],
@@ -118,6 +120,8 @@ 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 (RFC) */
+ "ip6rd" "\0" /* DHCP_6RD (Comcast) */
"msstaticroutes""\0"/* DHCP_MS_STATIC_ROUTES */
"wpad" "\0" /* DHCP_WPAD */
;
@@ -146,6 +150,7 @@ const uint8_t dhcp_option_lengths[] ALIGN1 = {
[OPTION_S32] = 4,
/* Just like OPTION_STRING, we use minimum length here */
[OPTION_STATIC_ROUTES] = 5,
+ [OPTION_6RD] = 22,
};
diff --git a/networking/udhcp/common.h b/networking/udhcp/common.h
index f8f18ff..56cd8b0 100644
--- a/networking/udhcp/common.h
+++ b/networking/udhcp/common.h
@@ -88,6 +88,7 @@ enum {
OPTION_S32,
OPTION_BIN,
OPTION_STATIC_ROUTES,
+ OPTION_6RD,
#if ENABLE_FEATURE_UDHCP_RFC3397
OPTION_DNS_STRING, /* RFC1035 compressed domain name list */
OPTION_SIP_SERVERS,
diff --git a/networking/udhcp/dhcpc.c b/networking/udhcp/dhcpc.c
index 78aabed..993326f 100644
--- a/networking/udhcp/dhcpc.c
+++ b/networking/udhcp/dhcpc.c
@@ -45,6 +45,7 @@ static const uint8_t len_of_option_as_string[] = {
[OPTION_IP ] = sizeof("255.255.255.255 "),
[OPTION_IP_PAIR ] = sizeof("255.255.255.255 ") * 2,
[OPTION_STATIC_ROUTES ] = sizeof("255.255.255.255/32 255.255.255.255 "),
+ [OPTION_6RD ] = sizeof("32 128 FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF 255.255.255.255 "),
[OPTION_STRING ] = 1,
#if ENABLE_FEATURE_UDHCP_RFC3397
[OPTION_DNS_STRING ] = 1, /* unused */
@@ -68,6 +69,23 @@ static int sprint_nip(char *dest, const char *pre, const uint8_t *ip)
return sprintf(dest, "%s%u.%u.%u.%u", pre, ip[0], ip[1], ip[2], ip[3]);
}
+static int sprint_nip6(char *dest, const char *pre, const uint8_t *ip)
+{
+ int len = 0;
+ int off;
+ uint16_t word;
+
+ len += sprintf(dest, "%s", pre);
+
+ for (off = 0; off < 16; off += 2)
+ {
+ move_from_unaligned16(word, &ip[off]);
+ len += sprintf(dest+len, "%s%04X", off ? ":" : "", htons(word));
+ }
+
+ return len;
+}
+
/* really simple implementation, just count the bits */
static int mton(uint32_t mask)
{
@@ -177,6 +195,70 @@ static NOINLINE char *xmalloc_optname_optval(uint8_t *option, const struct dhcp_
return ret;
}
+ case OPTION_6RD: {
+ /* Option binary format:
+ * 0 1 2 3
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | OPTION_6RD | option-length | IPv4MaskLen | 6rdPrefixLen |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | |
+ * | 6rdPrefix |
+ * | (16 octets) |
+ * | |
+ * | |
+ * | |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | 6rdBRIPv4Address(es) |
+ * . .
+ * . .
+ * . .
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ * We convert it to a string "IPv4MaskLen 6rdPrefixLen 6rdPrefix 6rdBRIPv4Address"
+ */
+
+ /* 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--;
+
+ /* 6rdPrefix */
+ dest += sprint_nip6(dest, "", option);
+ option += 16;
+ len -= 16;
+
+ /* 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;
+ }
+ }
+
+ return ret;
+ }
#if ENABLE_FEATURE_UDHCP_RFC3397
case OPTION_DNS_STRING:
/* unpack option into dest; use ret for prefix (i.e., "optname=") */
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