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Diffstat (limited to 'networking/udhcp/common.h')
-rw-r--r--networking/udhcp/common.h75
1 files changed, 73 insertions, 2 deletions
diff --git a/networking/udhcp/common.h b/networking/udhcp/common.h
index d7c874e..cf3e0cd 100644
--- a/networking/udhcp/common.h
+++ b/networking/udhcp/common.h
@@ -21,11 +21,17 @@ extern const uint8_t MAC_BCAST_ADDR[6]; /* six all-ones */
/*** packet.h ***/
-#define DHCP_OPTIONS_BUFSIZE 308
+/* DHCP protocol. See RFC 2131 */
+#define DHCP_MAGIC 0x63825363
+
+#define DHCP_OPTIONS_BUFSIZE 308
+
+#define BOOTREQUEST 1
+#define BOOTREPLY 2
//TODO: rename ciaddr/yiaddr/chaddr
struct dhcp_packet {
- uint8_t op; /* 1 = BOOTREQUEST, 2 = BOOTREPLY */
+ uint8_t op; /* BOOTREQUEST or BOOTREPLY */
uint8_t htype; /* hardware address type. 1 = 10mb ethernet */
uint8_t hlen; /* hardware address length */
uint8_t hops; /* used by relay agents only */
@@ -61,6 +67,71 @@ struct BUG_bad_sizeof_struct_ip_udp_dhcp_packet {
[(sizeof(struct ip_udp_dhcp_packet) != 576 + CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS) ? -1 : 1];
};
+// RFC 2131 Table 5: Fields and options used by DHCP clients
+//
+// Field DHCPDISCOVER DHCPREQUEST DHCPDECLINE,
+// DHCPINFORM DHCPRELEASE
+// ----- ------------ ----------- -----------
+// 'op' BOOTREQUEST BOOTREQUEST BOOTREQUEST
+// 'hops' 0 0 0
+// 'xid' selected by client 'xid' from server selected by
+// DHCPOFFER message client
+// 'secs' 0 or seconds since 0 or seconds since 0
+// DHCP process started DHCP process started
+// 'flags' Set 'BROADCAST' Set 'BROADCAST' 0
+// flag if client flag if client
+// requires broadcast requires broadcast
+// reply reply
+// 'ciaddr' 0 (DHCPDISCOVER) 0 or client's 0 (DHCPDECLINE)
+// client's network address client's network
+// network address (BOUND/RENEW/REBIND) address
+// (DHCPINFORM) (DHCPRELEASE)
+// 'yiaddr' 0 0 0
+// 'siaddr' 0 0 0
+// 'giaddr' 0 0 0
+// 'chaddr' client's hardware client's hardware client's hardware
+// address address address
+// 'sname' options, if options, if (unused)
+// indicated in indicated in
+// 'sname/file' 'sname/file'
+// option; otherwise option; otherwise
+// unused unused
+// 'file' options, if options, if (unused)
+// indicated in indicated in
+// 'sname/file' 'sname/file'
+// option; otherwise option; otherwise
+// unused unused
+// 'options' options options (unused)
+//
+// Option DHCPDISCOVER DHCPREQUEST DHCPDECLINE,
+// DHCPINFORM DHCPRELEASE
+// ------ ------------ ----------- -----------
+// Requested IP address MAY MUST (in MUST
+// (DISCOVER) SELECTING or (DHCPDECLINE),
+// MUST NOT INIT-REBOOT) MUST NOT
+// (INFORM) MUST NOT (in (DHCPRELEASE)
+// BOUND or
+// RENEWING)
+// IP address lease time MAY MAY MUST NOT
+// (DISCOVER)
+// MUST NOT
+// (INFORM)
+// Use 'file'/'sname' fields MAY MAY MAY
+// Client identifier MAY MAY MAY
+// Vendor class identifier MAY MAY MUST NOT
+// Server identifier MUST NOT MUST (after MUST
+// SELECTING)
+// MUST NOT (after
+// INIT-REBOOT,
+// BOUND, RENEWING
+// or REBINDING)
+// Parameter request list MAY MAY MUST NOT
+// Maximum message size MAY MAY MUST NOT
+// Message SHOULD NOT SHOULD NOT SHOULD
+// Site-specific MAY MAY MUST NOT
+// All others MAY MAY MUST NOT
+
+
uint16_t udhcp_checksum(void *addr, int count) FAST_FUNC;
void udhcp_init_header(struct dhcp_packet *packet, char type) FAST_FUNC;