[PATCH 09/16] kvm tools: Introduce uip_tx_do_ipv4_udp_dhcp()

[Asias He]

uip_tx_do_ipv4_udp_dhcp() is used to handle DHCP packages from guest.

Signed-off-by: Asias He <asias.he...@gmail.com>
---
 tools/kvm/include/kvm/uip.h |    4 ++++
 tools/kvm/net/uip/dhcp.c    |   38 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 42 insertions(+), 0 deletions(-)

diff --git a/tools/kvm/include/kvm/uip.h b/tools/kvm/include/kvm/uip.h
index e6b1285..344ec09 100644
--- a/tools/kvm/include/kvm/uip.h
+++ b/tools/kvm/include/kvm/uip.h
@@ -29,6 +29,8 @@
 #define UIP_TCP_FLAG_ACK       16
 #define UIP_TCP_FLAG_URG       32
 
+#define UIP_BOOTP_VENDOR_SPECIFIC_LEN  64
+#define UIP_BOOTP_MAX_PAYLOAD_LEN      300
 #define UIP_DHCP_VENDOR_SPECIFIC_LEN   312
 #define UIP_DHCP_PORT_SERVER           67
 #define UIP_DHCP_PORT_CLIENT           68
@@ -38,6 +40,7 @@
 #define UIP_DHCP_MAGIC_COOKIE          0x63825363
 #define UIP_DHCP_MAGIC_COOKIE_LEN      4
 #define UIP_DHCP_LEASE_TIME            0x00003840
+#define UIP_DHCP_MAX_PAYLOAD_LEN       (UIP_BOOTP_MAX_PAYLOAD_LEN - 
UIP_BOOTP_VENDOR_SPECIFIC_LEN +  UIP_DHCP_VENDOR_SPECIFIC_LEN)
 #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
@@ -328,6 +331,7 @@ int uip_tx(struct iovec *iov, u16 out, struct uip_info 
*info);
 int uip_rx(struct iovec *iov, u16 in, struct uip_info *info);
 int uip_init(struct uip_info *info);
 
+int uip_tx_do_ipv4_udp_dhcp(struct uip_tx_arg *arg);
 int uip_tx_do_ipv4_icmp(struct uip_tx_arg *arg);
 int uip_tx_do_ipv4_tcp(struct uip_tx_arg *arg);
 int uip_tx_do_ipv4_udp(struct uip_tx_arg *arg);
diff --git a/tools/kvm/net/uip/dhcp.c b/tools/kvm/net/uip/dhcp.c
index 612e024..865b376 100644
--- a/tools/kvm/net/uip/dhcp.c
+++ b/tools/kvm/net/uip/dhcp.c
@@ -154,3 +154,41 @@ static int uip_dhcp_make_pkg(struct uip_info *info, struct 
uip_udp_socket *sk, s
 
        return 0;
 }
+
+int uip_tx_do_ipv4_udp_dhcp(struct uip_tx_arg *arg)
+{
+       struct uip_udp_socket sk;
+       struct uip_dhcp *dhcp;
+       struct uip_info *info;
+       struct uip_buf *buf;
+       u8 reply_msg_type;
+
+       dhcp = (struct uip_dhcp *)arg->eth;
+
+       if (uip_dhcp_is_discovery(dhcp))
+               reply_msg_type = UIP_DHCP_OFFER;
+       else if (uip_dhcp_is_request(dhcp))
+               reply_msg_type = UIP_DHCP_ACK;
+       else
+               return -1;
+
+       buf = uip_buf_clone(arg);
+       info = arg->info;
+
+       /*
+        * Cook DHCP pkg
+        */
+       uip_dhcp_make_pkg(info, &sk, buf, reply_msg_type);
+
+       /*
+        * Cook UDP pkg
+        */
+       uip_udp_make_pkg(info, &sk, buf, NULL, UIP_DHCP_MAX_PAYLOAD_LEN);
+
+       /*
+        * Send data received from socket to guest
+        */
+       uip_buf_set_used(info, buf);
+
+       return 0;
+}
-- 
1.7.5.4

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