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[dhcp] Use a random DHCP transaction identifier (xid)

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iPXE currently uses the last four bytes of the MAC address as the DHCP
transaction identifier.  Reduce the probability of collisions by
generating a random transaction identifier.

Originally-implemented-by: Amos Kong <akong@redhat.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2011-09-19 17:30:39 +01:00
parent 8b092f4c50
commit 12767d2202
3 changed files with 36 additions and 29 deletions
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9
src/include/ipxe/dhcp.h
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@@ -660,15 +660,18 @@ struct dhcphdr {
/** Setting block name used for BootServerDHCP responses */
#define PXEBS_SETTINGS_NAME "pxebs"
extern uint32_t dhcp_last_xid;
extern unsigned int dhcp_chaddr ( struct net_device *netdev, void *chaddr,
uint16_t *flags );
extern int dhcp_create_packet ( struct dhcp_packet *dhcppkt,
struct net_device *netdev, uint8_t msgtype,
const void *options, size_t options_len,
void *data, size_t max_len );
uint32_t xid, const void *options,
size_t options_len, void *data,
size_t max_len );
extern int dhcp_create_request ( struct dhcp_packet *dhcppkt,
struct net_device *netdev,
unsigned int msgtype, struct in_addr ciaddr,
unsigned int msgtype, uint32_t xid,
struct in_addr ciaddr,
void *data, size_t max_len );
extern int start_dhcp ( struct interface *job, struct net_device *netdev );
extern int start_pxebs ( struct interface *job, struct net_device *netdev,