X-Git-Url: http://ftp.safe.ca/?p=safe%2Fjmp%2Flinux-2.6;a=blobdiff_plain;f=net%2Fipv4%2Fipconfig.c;h=7dcbf47060994dcb2fb92acc63178c44a0455e6d;hp=90d22ae0a419e95f4a34c26a40673b03ed1840b1;hb=dc7a08166f3a5f23e79e839a8a88849bd3397c32;hpb=09640e6365c679b5642b1c41b6d7078f51689ddf

diff --git a/net/ipv4/ipconfig.c b/net/ipv4/ipconfig.c
index 90d22ae..7dcbf47 100644
--- a/net/ipv4/ipconfig.c
+++ b/net/ipv4/ipconfig.c
@@ -139,6 +139,8 @@ __be32 ic_servaddr = NONE;	/* Boot server IP address */
 __be32 root_server_addr = NONE;	/* Address of NFS server */
 u8 root_server_path[256] = { 0, };	/* Path to mount as root */
 
+u32 ic_dev_xid;		/* Device under configuration */
+
 /* vendor class identifier */
 static char vendor_class_identifier[253] __initdata;
 
@@ -158,6 +160,9 @@ static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
 /* Protocols supported by available interfaces */
 static int ic_proto_have_if __initdata = 0;
 
+/* MTU for boot device */
+static int ic_dev_mtu __initdata = 0;
+
 #ifdef IPCONFIG_DYNAMIC
 static DEFINE_SPINLOCK(ic_recv_lock);
 static volatile int ic_got_reply __initdata = 0;    /* Proto(s) that replied */
@@ -284,7 +289,7 @@ set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
 	sin->sin_port = port;
 }
 
-static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
+static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg)
 {
 	int res;
 
@@ -295,6 +300,17 @@ static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
 	return res;
 }
 
+static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
+{
+	int res;
+
+	mm_segment_t oldfs = get_fs();
+	set_fs(get_ds());
+	res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
+	set_fs(oldfs);
+	return res;
+}
+
 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
 {
 	int res;
@@ -319,20 +335,31 @@ static int __init ic_setup_if(void)
 	memset(&ir, 0, sizeof(ir));
 	strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
 	set_sockaddr(sin, ic_myaddr, 0);
-	if ((err = ic_dev_ioctl(SIOCSIFADDR, &ir)) < 0) {
+	if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) {
 		printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err);
 		return -1;
 	}
 	set_sockaddr(sin, ic_netmask, 0);
-	if ((err = ic_dev_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
+	if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
 		printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err);
 		return -1;
 	}
 	set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
-	if ((err = ic_dev_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
+	if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
 		printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err);
 		return -1;
 	}
+	/* Handle the case where we need non-standard MTU on the boot link (a network
+	 * using jumbo frames, for instance).  If we can't set the mtu, don't error
+	 * out, we'll try to muddle along.
+	 */
+	if (ic_dev_mtu != 0) {
+		strcpy(ir.ifr_name, ic_dev->name);
+		ir.ifr_mtu = ic_dev_mtu;
+		if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0)
+			printk(KERN_ERR "IP-Config: Unable to set interface mtu to %d (%d).\n",
+			                 ic_dev_mtu, err);
+	}
 	return 0;
 }
 
@@ -621,6 +648,7 @@ ic_dhcp_init_options(u8 *options)
 			12,	/* Host name */
 			15,	/* Domain name */
 			17,	/* Boot path */
+			26,	/* MTU */
 			40,	/* NIS domain name */
 		};
 
@@ -796,6 +824,7 @@ static void __init ic_do_bootp_ext(u8 *ext)
 {
        u8 servers;
        int i;
+	u16 mtu;
 
 #ifdef IPCONFIG_DEBUG
 	u8 *c;
@@ -835,6 +864,10 @@ static void __init ic_do_bootp_ext(u8 *ext)
 			if (!root_server_path[0])
 				ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path));
 			break;
+		case 26:	/* Interface MTU */
+			memcpy(&mtu, ext+1, sizeof(mtu));
+			ic_dev_mtu = ntohs(mtu);
+			break;
 		case 40:	/* NIS Domain name (_not_ DNS) */
 			ic_bootp_string(utsname()->domainname, ext+1, *ext, __NEW_UTS_LEN);
 			break;
@@ -932,6 +965,13 @@ static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, str
 		goto drop_unlock;
 	}
 
+	/* Is it a reply for the device we are configuring? */
+	if (b->xid != ic_dev_xid) {
+		if (net_ratelimit())
+			printk(KERN_ERR "DHCP/BOOTP: Ignoring delayed packet \n");
+		goto drop_unlock;
+	}
+
 	/* Parse extensions */
 	if (ext_len >= 4 &&
 	    !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
@@ -1115,6 +1155,9 @@ static int __init ic_dynamic(void)
 	get_random_bytes(&timeout, sizeof(timeout));
 	timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
 	for (;;) {
+		/* Track the device we are configuring */
+		ic_dev_xid = d->xid;
+
 #ifdef IPCONFIG_BOOTP
 		if (do_bootp && (d->able & IC_BOOTP))
 			ic_bootp_send_if(d, jiffies - start_jiffies);
@@ -1391,6 +1434,8 @@ static int __init ip_auto_config(void)
 	printk(",\n     bootserver=%pI4", &ic_servaddr);
 	printk(", rootserver=%pI4", &root_server_addr);
 	printk(", rootpath=%s", root_server_path);
+	if (ic_dev_mtu)
+		printk(", mtu=%d", ic_dev_mtu);
 	printk("\n");
 #endif /* !SILENT */
 
@@ -1402,7 +1447,7 @@ late_initcall(ip_auto_config);
 
 /*
  *  Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
- *  command line parameter.  See Documentation/filesystems/nfsroot.txt.
+ *  command line parameter.  See Documentation/filesystems/nfs/nfsroot.txt.
  */
 static int __init ic_proto_name(char *name)
 {