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SubjectPATCH: Multiple Nameservers with IP autoconfig
Hi,

I needed more than one nameserver with IP autoconfig from /proc/net/pnp,
so I wrote this patch. I'm using this patch quite a while with 2.4.17 & 2.4.18,
it also applies clean to 2.4.19. Please have a look at it, and if my copy&paste
didn't completely break it this should be ready for the main kernel tree.

Regards,

Josef Siemes

--- linux-2.4.19/net/ipv4/ipconfig.c Sat Aug 3 02:39:46 2002
+++ linux-2.4.19-multidns/net/ipv4/ipconfig.c Mon Aug 12 13:57:41 2002
@@ -26,6 +26,9 @@
*
* Merged changes from 2.2.19 into 2.4.3
* -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001
+ *
+ * Multipe Nameservers in /proc/net/pnp
+ * -- Josef Siemes <jsiemes@web.de>, Aug 2002
*/

#include <linux/config.h>
@@ -90,6 +93,8 @@
#define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */
#define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */
#define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */
+#define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers
+ - '3' from resolv.h */


/*
@@ -131,7 +136,7 @@
/* Persistent data: */

int ic_proto_used; /* Protocol used, if any */
-u32 ic_nameserver = INADDR_NONE; /* DNS Server IP address */
+u32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
u8 ic_domain[64]; /* DNS (not NIS) domain name */

/*
@@ -624,6 +629,12 @@
*/
static inline void ic_bootp_init(void)
{
+ int i;
+
+ for (i=0;i<CONF_NAMESERVERS_MAX;i++)
+ {
+ ic_nameservers[i] = INADDR_NONE;
+ } /* initialize DNS Server IP addresses */
dev_add_pack(&bootp_packet_type);
}

@@ -728,6 +739,9 @@
*/
static void __init ic_do_bootp_ext(u8 *ext)
{
+ u8 servers;
+ int i;
+
#ifdef IPCONFIG_DEBUG
u8 *c;

@@ -747,8 +761,14 @@
memcpy(&ic_gateway, ext+1, 4);
break;
case 6: /* DNS server */
- if (ic_nameserver == INADDR_NONE)
- memcpy(&ic_nameserver, ext+1, 4);
+ servers= *ext/4;
+ if (servers > CONF_NAMESERVERS_MAX)
+ servers=CONF_NAMESERVERS_MAX;
+ for (i=0;i<servers;i++)
+ {
+ if (ic_nameservers[i] == INADDR_NONE)
+ memcpy(&ic_nameservers[i], ext+1+4*i, 4);
+ }
break;
case 12: /* Host name */
ic_bootp_string(system_utsname.nodename, ext+1, *ext, __NEW_UTS_LEN);
@@ -913,8 +933,8 @@
ic_servaddr = b->server_ip;
if (ic_gateway == INADDR_NONE && b->relay_ip)
ic_gateway = b->relay_ip;
- if (ic_nameserver == INADDR_NONE)
- ic_nameserver = ic_servaddr;
+ if (ic_nameservers[0] == INADDR_NONE)
+ ic_nameservers[0] = ic_servaddr;
ic_got_reply = IC_BOOTP;

drop:
@@ -1077,6 +1097,7 @@
off_t offset, int length)
{
int len;
+ int i;

if (ic_proto_used & IC_PROTO)
sprintf(buffer, "#PROTO: %s\n",
@@ -1089,9 +1110,12 @@
if (ic_domain[0])
len += sprintf(buffer + len,
"domain %s\n", ic_domain);
- if (ic_nameserver != INADDR_NONE)
- len += sprintf(buffer + len,
- "nameserver %u.%u.%u.%u\n", NIPQUAD(ic_nameserver));
+ for (i=0;i<CONF_NAMESERVERS_MAX;i++)
+ {
+ if (ic_nameservers[i] != INADDR_NONE)
+ len += sprintf(buffer + len,
+ "nameserver %s\n", in_ntoa(ic_nameservers[i]));
+ }

if (offset > len)
offset = len;
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