[PATCH 4/8] ipconfig: BOOTP: Request CONF_NAMESERVERS_MAX name servers

[Chris Novakovic <chris@chrisn.me.uk>]

When ipconfig is autoconfigured via BOOTP, the request packet
initialised by ic_bootp_init_ext() always allocates 8 bytes for the name
server option, limiting the BOOTP server to responding with at most 2
name servers even though ipconfig in fact supports an arbitrary number
of name servers (as defined by CONF_NAMESERVERS_MAX, which is currently
3).

Only request name servers in the request packet if CONF_NAMESERVERS_MAX
is positive (to comply with [1, §3.8]), and allocate enough space in the
packet for CONF_NAMESERVERS_MAX name servers to indicate the maximum
number we can accept in response.

[1] RFC 2132, "DHCP Options and BOOTP Vendor Extensions":
    https://tools.ietf.org/rfc/rfc2132.txt

Signed-off-by: Chris Novakovic <chris@chrisn.me.uk>
---
 net/ipv4/ipconfig.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/ipv4/ipconfig.c b/net/ipv4/ipconfig.c
index bcf3c4f9882d..0f460d6d3cce 100644
--- a/net/ipv4/ipconfig.c
+++ b/net/ipv4/ipconfig.c
@@ -721,9 +721,11 @@ static void __init ic_bootp_init_ext(u8 *e)
 	*e++ = 3;		/* Default gateway request */
 	*e++ = 4;
 	e += 4;
+#if CONF_NAMESERVERS_MAX > 0
 	*e++ = 6;		/* (DNS) name server request */
-	*e++ = 8;
-	e += 8;
+	*e++ = 4 * CONF_NAMESERVERS_MAX;
+	e += 4 * CONF_NAMESERVERS_MAX;
+#endif
 	*e++ = 12;		/* Host name request */
 	*e++ = 32;
 	e += 32;
-- 
2.14.1