diff options
Diffstat (limited to 'networking/udhcp/common.h')
| -rw-r--r-- | networking/udhcp/common.h | 75 |
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; |