[systemd-commits] src/libsystemd-network

Tom Gundersen tomegun at kemper.freedesktop.org
Tue Jun 3 01:59:43 PDT 2014

 src/libsystemd-network/sd-dhcp-client.c |    9 +++++++++
 1 file changed, 9 insertions(+)

New commits:
commit 63a070415db09f5b5bcc5c487bfc85dabe443dde
Author: Camilo Aguilar <camilo.aguilar at gmail.com>
Date:   Wed May 28 14:43:37 2014 -0400

    sd-dhcp-client: allways request broadcast
    On systems which cannot receive unicast packets until its IP stack has been configured
    we need to request broadcast packets. We are currently not able to reliably detect when
    this is necessary, so set it unconditionally for now.
    This is set on all packets, but the DHCP server will only broadcast the packets that are
    necessary, and unicast the rest.
    For more information please refer to this thread in CoreOS: https://github.com/coreos/bugs/issues/12
    [tomegun: rephrased commit message]

diff --git a/src/libsystemd-network/sd-dhcp-client.c b/src/libsystemd-network/sd-dhcp-client.c
index 0300a6b..8f54906 100644
--- a/src/libsystemd-network/sd-dhcp-client.c
+++ b/src/libsystemd-network/sd-dhcp-client.c
@@ -286,6 +286,15 @@ static int client_message_init(sd_dhcp_client *client, DHCPPacket **ret,
            refuse to issue an DHCP lease if 'secs' is set to zero */
         packet->dhcp.secs = htobe16(client->secs);
+        /* RFC2132 section 4.1
+           A client that cannot receive unicast IP datagrams until its protocol
+           software has been configured with an IP address SHOULD set the
+           BROADCAST bit in the 'flags' field to 1 in any DHCPDISCOVER or
+           DHCPREQUEST messages that client sends.  The BROADCAST bit will
+           provide a hint to the DHCP server and BOOTP relay agent to broadcast
+           any messages to the client on the client's subnet. */
+        packet->dhcp.flags = htobe16(0x8000);
         /* RFC2132 section 4.1.1:
            The client MUST include its hardware address in the ’chaddr’ field, if
            necessary for delivery of DHCP reply messages.

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