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[04/16] kvm tools: Add helpers to tell the type of a DHCP message

Message ID 1310893024-21615-5-git-send-email-asias.hejun@gmail.com (mailing list archive)
State New, archived
Headers show

Commit Message

Asias He July 17, 2011, 8:56 a.m. UTC 
If DHCP DISCOVER or DHCP REQUEST is found, reply with DHCP OFFER or DHCP
ACK respectively.

Signed-off-by: Asias He <asias.hejun@gmail.com>
---
 tools/kvm/include/kvm/uip.h |    6 ++++++
 tools/kvm/net/uip/dhcp.c    |   14 ++++++++++++++
 2 files changed, 20 insertions(+), 0 deletions(-)
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Patch

diff --git a/tools/kvm/include/kvm/uip.h b/tools/kvm/include/kvm/uip.h
index 7c84dea..6534c7f 100644
--- a/tools/kvm/include/kvm/uip.h
+++ b/tools/kvm/include/kvm/uip.h
@@ -38,6 +38,12 @@ 
 #define UIP_DHCP_MAGIC_COOKIE		0x63825363
 #define UIP_DHCP_MAGIC_COOKIE_LEN	4
 #define UIP_DHCP_OPTION_LEN		(UIP_DHCP_VENDOR_SPECIFIC_LEN - UIP_DHCP_MAGIC_COOKIE_LEN)
+#define UIP_DHCP_DISCOVER		1
+#define UIP_DHCP_OFFER			2
+#define UIP_DHCP_REQUEST		3
+#define UIP_DHCP_ACK			5
+#define UIP_DHCP_TAG_MSG_TYPE		53
+#define UIP_DHCP_TAG_MSG_TYPE_LEN	1
 /*
  * IP package maxium len == 64 KBytes
  * IP header == 20 Bytes
diff --git a/tools/kvm/net/uip/dhcp.c b/tools/kvm/net/uip/dhcp.c
index af0407f..0a6293a 100644
--- a/tools/kvm/net/uip/dhcp.c
+++ b/tools/kvm/net/uip/dhcp.c
@@ -1,5 +1,19 @@ 
 #include "kvm/uip.h"
 
+static inline bool uip_dhcp_is_discovery(struct uip_dhcp *dhcp)
+{
+	return (dhcp->option[2] == UIP_DHCP_DISCOVER &&
+		dhcp->option[1] == UIP_DHCP_TAG_MSG_TYPE_LEN &&
+		dhcp->option[0] == UIP_DHCP_TAG_MSG_TYPE);
+}
+
+static inline bool uip_dhcp_is_request(struct uip_dhcp *dhcp)
+{
+	return (dhcp->option[2] == UIP_DHCP_REQUEST &&
+		dhcp->option[1] == UIP_DHCP_TAG_MSG_TYPE_LEN &&
+		dhcp->option[0] == UIP_DHCP_TAG_MSG_TYPE);
+}
+
 bool uip_udp_is_dhcp(struct uip_udp *udp)
 {
 	struct uip_dhcp *dhcp;