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busybox: udhcpc source IP rebind patch

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Patch sets the source IP address of DHCP request messages during rebind to the IP address
assigned to the udhcpc client. Source address 0.0.0.0 can only be used by a client prior
to obtaining its IP address (see RFC2131 § 4.1). Source IP address behavior lines up now with
the ISC dhcp client implementation for DHCP request messages during rebind and DHCP release
messages.

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>

SVN-Revision: 40878
This commit is contained in:
Steven Barth 2014-05-29 10:35:34 +00:00
parent 83ccc9a8f6
commit 50b663de47
1 changed files with 53 additions and 0 deletions
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53
package/utils/busybox/patches/204-udhcpc_src_ip_rebind.patch Normal file
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@ -0,0 +1,53 @@
Index: busybox-1.22.1/networking/udhcp/dhcpc.c
===================================================================
--- busybox-1.22.1.orig/networking/udhcp/dhcpc.c
+++ busybox-1.22.1/networking/udhcp/dhcpc.c
@@ -659,10 +659,10 @@ static void add_client_options(struct dh
* client reverts to using the IP broadcast address.
*/
-static int raw_bcast_from_client_config_ifindex(struct dhcp_packet *packet)
+static int raw_bcast_from_client_config_ifindex(struct dhcp_packet *packet, uint32_t src_nip)
{
return udhcp_send_raw_packet(packet,
- /*src*/ INADDR_ANY, CLIENT_PORT,
+ /*src*/ src_nip, CLIENT_PORT,
/*dst*/ INADDR_BROADCAST, SERVER_PORT, MAC_BCAST_ADDR,
client_config.ifindex);
}
@@ -673,7 +673,7 @@ static int bcast_or_ucast(struct dhcp_pa
return udhcp_send_kernel_packet(packet,
ciaddr, CLIENT_PORT,
server, SERVER_PORT);
- return raw_bcast_from_client_config_ifindex(packet);
+ return raw_bcast_from_client_config_ifindex(packet, ciaddr);
}
/* Broadcast a DHCP discover packet to the network, with an optionally requested IP */
@@ -701,7 +701,7 @@ static NOINLINE int send_discover(uint32
if (msgs++ < 3)
bb_info_msg("Sending discover...");
- return raw_bcast_from_client_config_ifindex(&packet);
+ return raw_bcast_from_client_config_ifindex(&packet, INADDR_ANY);
}
/* Broadcast a DHCP request message */
@@ -745,7 +745,7 @@ static NOINLINE int send_select(uint32_t
addr.s_addr = requested;
bb_info_msg("Sending select for %s...", inet_ntoa(addr));
- return raw_bcast_from_client_config_ifindex(&packet);
+ return raw_bcast_from_client_config_ifindex(&packet, INADDR_ANY);
}
/* Unicast or broadcast a DHCP renew message */
@@ -813,7 +813,7 @@ static NOINLINE int send_decline(/*uint3
udhcp_add_simple_option(&packet, DHCP_SERVER_ID, server);
bb_info_msg("Sending decline...");
- return raw_bcast_from_client_config_ifindex(&packet);
+ return raw_bcast_from_client_config_ifindex(&packet, INADDR_ANY);
}
#endif