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udhcpc: add support for DHCP option 212 (RFC 5969)

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The patch is from OpenWRT people.

function                                             old     new   delta
xmalloc_optname_optval                               637     874    +237
dhcp_option_strings                                  237     243      +6
dhcp_optflags                                         68      70      +2
len_of_option_as_string                               12      13      +1
dhcp_option_lengths                                   12      13      +1
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 5/0 up/down: 247/0)             Total: 247 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2011-10-19 22:40:35 +02:00
parent 2ea73b513d
commit 1f56e51ca1
4 changed files with 84 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

80
networking/udhcp/dhcpc.c
View File

@@ -100,6 +100,7 @@ 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 */
@@ -123,6 +124,24 @@ 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)
{
char hexstrbuf[16 * 2];
bin2hex(hexstrbuf, (void*)ip, 16);
return sprintf(dest, "%s"
"%.4s:%.4s:%.4s:%.4s:%.4s:%.4s:%.4s:%.4s",
pre,
hexstrbuf + 0 * 4,
hexstrbuf + 1 * 4,
hexstrbuf + 2 * 4,
hexstrbuf + 3 * 4,
hexstrbuf + 4 * 4,
hexstrbuf + 5 * 4,
hexstrbuf + 6 * 4,
hexstrbuf + 7 * 4
);
}
/* really simple implementation, just count the bits */
static int mton(uint32_t mask)
{
@@ -147,7 +166,8 @@ static NOINLINE char *xmalloc_optname_optval(uint8_t *option, const struct dhcp_
type = optflag->flags & OPTION_TYPE_MASK;
optlen = dhcp_option_lengths[type];
upper_length = len_of_option_as_string[type] * ((unsigned)len / (unsigned)optlen);
upper_length = len_of_option_as_string[type]
* ((unsigned)(len + optlen - 1) / (unsigned)optlen);
dest = ret = xmalloc(upper_length + strlen(opt_name) + 2);
dest += sprintf(ret, "%s=", opt_name);
@@ -230,6 +250,62 @@ static NOINLINE char *xmalloc_optname_optval(uint8_t *option, const struct dhcp_
len -= 4;
}
return ret;
}
case OPTION_6RD: {
/* Option binary format (see RFC 5969):
* 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 <= 32,
* 6rdPrefixLen <= 128,
* 6rdPrefixLen + (32 - IPv4MaskLen) <= 128
* (2nd condition need no check - it follows from 1st and 3rd).
* If any of these requirements is not fulfilled, return with empty
* value.
*/
if (len >= 22
&& option[0] <= 32
&& (option[1] + 32 - option[0]) <= 128
) {
/* IPv4MaskLen */
dest += sprintf(dest, "%u ", *option++);
/* 6rdPrefixLen */
dest += sprintf(dest, "%u ", *option++);
/* 6rdPrefix */
dest += sprint_nip6(dest, "", option);
option += 16;
len -= 1 + 1 + 16;
/* 6rdBRIPv4Address(es) */
while (1) {
dest += sprint_nip(dest, " ", option);
option += 4;
len -= 4;
if (len < 0)
break;
}
}
return ret;
}
#if ENABLE_FEATURE_UDHCP_RFC3397
@@ -394,7 +470,7 @@ static char **fill_envp(struct dhcp_packet *packet)
len = temp[-OPT_DATA + OPT_LEN];
*curr = xmalloc(sizeof("optNNN=") + 1 + len*2);
ofs = sprintf(*curr, "opt%u=", i);
bin2hex(*curr + ofs, (void*) temp, len)[0] = '\0';
*bin2hex(*curr + ofs, (void*) temp, len) = '\0';
putenv(*curr++);
}
i++;