mirror of
git://git.openwrt.org/openwrt/openwrt.git
synced 2025-10-31 05:54:26 -04:00
144 lines
5.2 KiB
Diff
144 lines
5.2 KiB
Diff
--- a/networking/udhcp/common.c
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+++ b/networking/udhcp/common.c
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@@ -54,6 +54,8 @@ const struct dhcp_optflag dhcp_optflags[
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{ OPTION_SIP_SERVERS , 0x78 }, /* DHCP_SIP_SERVERS */
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#endif
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{ OPTION_STATIC_ROUTES , 0x79 }, /* DHCP_STATIC_ROUTES */
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+ { OPTION_6RD , 0xd4 }, /* DHCP_6RD (RFC) */
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+ { OPTION_6RD , 0x96 }, /* DHCP_6RD (Comcast) */
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{ OPTION_STRING , 0xfc }, /* DHCP_WPAD */
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/* Options below have no match in dhcp_option_strings[],
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@@ -114,6 +116,8 @@ const char dhcp_option_strings[] ALIGN1
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// doesn't work in udhcpd.conf since OPTION_STATIC_ROUTES
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// is not handled yet by "string->option" conversion code:
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"staticroutes" "\0"/* DHCP_STATIC_ROUTES */
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+ "ip6rd" "\0" /* DHCP_6RD (RFC) */
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+ "ip6rd" "\0" /* DHCP_6RD (Comcast) */
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"wpad" "\0" /* DHCP_WPAD */
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;
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@@ -141,6 +145,7 @@ const uint8_t dhcp_option_lengths[] ALIG
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[OPTION_S32] = 4,
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/* Just like OPTION_STRING, we use minimum length here */
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[OPTION_STATIC_ROUTES] = 5,
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+ [OPTION_6RD] = 22,
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};
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--- a/networking/udhcp/dhcpc.c
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+++ b/networking/udhcp/dhcpc.c
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@@ -45,6 +45,7 @@ static const uint8_t len_of_option_as_st
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[OPTION_IP ] = sizeof("255.255.255.255 "),
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[OPTION_IP_PAIR ] = sizeof("255.255.255.255 ") * 2,
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[OPTION_STATIC_ROUTES ] = sizeof("255.255.255.255/32 255.255.255.255 "),
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+ [OPTION_6RD ] = sizeof("32 128 FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF 255.255.255.255 "),
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[OPTION_STRING ] = 1,
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#if ENABLE_FEATURE_UDHCP_RFC3397
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[OPTION_DNS_STRING ] = 1, /* unused */
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@@ -68,6 +69,23 @@ static int sprint_nip(char *dest, const
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return sprintf(dest, "%s%u.%u.%u.%u", pre, ip[0], ip[1], ip[2], ip[3]);
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}
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+static int sprint_nip6(char *dest, const char *pre, const uint8_t *ip)
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+{
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+ int len = 0;
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+ int off;
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+ uint16_t word;
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+
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+ len += sprintf(dest, "%s", pre);
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+
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+ for (off = 0; off < 16; off += 2)
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+ {
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+ move_from_unaligned16(word, &ip[off]);
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+ len += sprintf(dest+len, "%s%04X", off ? ":" : "", htons(word));
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+ }
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+
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+ return len;
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+}
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+
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/* really simple implementation, just count the bits */
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static int mton(uint32_t mask)
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{
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@@ -177,6 +195,70 @@ static NOINLINE char *xmalloc_optname_op
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return ret;
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}
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+ case OPTION_6RD: {
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+ /* Option binary format:
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+ * 0 1 2 3
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+ * 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
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+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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+ * | OPTION_6RD | option-length | IPv4MaskLen | 6rdPrefixLen |
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+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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+ * | |
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+ * | 6rdPrefix |
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+ * | (16 octets) |
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+ * | |
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+ * | |
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+ * | |
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+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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+ * | 6rdBRIPv4Address(es) |
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+ * . .
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+ * . .
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+ * . .
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+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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+ *
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+ * We convert it to a string "IPv4MaskLen 6rdPrefixLen 6rdPrefix 6rdBRIPv4Address"
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+ */
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+
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+ /* Sanity check: ensure that our length is at least 22 bytes, that
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+ * IPv4MaskLen is <= 32, 6rdPrefixLen <= 128 and that the sum of
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+ * (32 - IPv4MaskLen) + 6rdPrefixLen is less than or equal to 128.
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+ * If any of these requirements is not fulfilled, return with empty
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+ * value.
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+ */
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+ if ((len >= 22) && (*option <= 32) && (*(option+1) <= 128) &&
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+ (((32 - *option) + *(option+1)) <= 128))
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+ {
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+ /* IPv4MaskLen */
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+ dest += sprintf(dest, "%u ", *option++);
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+ len--;
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+
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+ /* 6rdPrefixLen */
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+ dest += sprintf(dest, "%u ", *option++);
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+ len--;
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+
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+ /* 6rdPrefix */
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+ dest += sprint_nip6(dest, "", option);
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+ option += 16;
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+ len -= 16;
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+
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+ /* 6rdBRIPv4Addresses */
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+ while (len >= 4)
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+ {
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+ dest += sprint_nip(dest, " ", option);
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+ option += 4;
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+ len -= 4;
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+
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+ /* the code to determine the option size fails to work with
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+ * lengths that are not a multiple of the minimum length,
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+ * adding all advertised 6rdBRIPv4Addresses here would
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+ * overflow the destination buffer, therefore skip the rest
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+ * for now
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+ */
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+ break;
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+ }
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+ }
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+
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+ return ret;
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+ }
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#if ENABLE_FEATURE_UDHCP_RFC3397
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case OPTION_DNS_STRING:
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/* unpack option into dest; use ret for prefix (i.e., "optname=") */
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--- a/networking/udhcp/common.h
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+++ b/networking/udhcp/common.h
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@@ -88,6 +88,7 @@ enum {
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OPTION_S32,
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OPTION_BIN,
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OPTION_STATIC_ROUTES,
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+ OPTION_6RD,
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#if ENABLE_FEATURE_UDHCP_RFC3397
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OPTION_DNS_STRING, /* RFC1035 compressed domain name list */
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OPTION_SIP_SERVERS,
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