ipconfig: handle case of delayed DHCP server (2513dfb8) · Commits · 戴 / test

If a DHCP server is delayed, it's possible for the client to receive the DHCPOFFER after it has already sent out a new DHCPDISCOVER message from a second interface. The client then sends out a DHCPREQUEST from the second interface, but the server doesn't recognize the device and rejects the request. This patch simply tracks the current device being configured and throws away the OFFER if it is not intended for the current device. A more sophisticated approach would be to put the OFFER information into the struct ic_device rather than storing it globally. Signed-off-by:

Chris Friesen <cfriesen@nortel.com> Signed-off-by:

David S. Miller <davem@davemloft.net>

net/ipv4/ipconfig.c

+12 −0

Original line number	Diff line number	Diff line
		@@ -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;

		@@ -932,6 +934,13 @@ 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 +1124,9 @@ 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);

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