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Use RFC4390 whenever hardware address exceeds 16 bytes; this allows us

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to construct DHCP packets suitable for Infiniband.
This commit is contained in:
Michael Brown 2007-09-13 01:53:04 +01:00
parent 9c264faa0c
commit af303db75d
2 changed files with 43 additions and 2 deletions
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7
src/include/gpxe/dhcp.h
View File

@ -432,6 +432,13 @@ struct dhcphdr {
/** Opcode for a reply from server to client */
#define BOOTP_REPLY 2
/** BOOTP reply must be broadcast
*
* Clients that cannot accept unicast BOOTP replies must set this
* flag.
*/
#define BOOTP_FL_BROADCAST 0x8000
/** DHCP magic cookie */
#define DHCP_MAGIC_COOKIE 0x63825363UL

38
src/net/udp/dhcp.c
View File

@ -298,6 +298,7 @@ static int create_dhcp_packet ( struct net_device *netdev, uint8_t msgtype,
void *data, size_t max_len,
struct dhcp_packet *dhcppkt ) {
struct dhcphdr *dhcphdr = data;
unsigned int hlen;
int rc;
/* Sanity check */
@ -309,9 +310,17 @@ static int create_dhcp_packet ( struct net_device *netdev, uint8_t msgtype,
dhcphdr->xid = dhcp_xid ( netdev );
dhcphdr->magic = htonl ( DHCP_MAGIC_COOKIE );
dhcphdr->htype = ntohs ( netdev->ll_protocol->ll_proto );
dhcphdr->hlen = netdev->ll_protocol->ll_addr_len;
memcpy ( dhcphdr->chaddr, netdev->ll_addr, dhcphdr->hlen );
dhcphdr->op = dhcp_op[msgtype];
/* If hardware length exceeds the chaddr field length, don't
* use the chaddr field. This is as per RFC4390.
*/
hlen = netdev->ll_protocol->ll_addr_len;
if ( hlen > sizeof ( dhcphdr->chaddr ) ) {
hlen = 0;
dhcphdr->flags = htons ( BOOTP_FL_BROADCAST );
}
dhcphdr->hlen = hlen;
memcpy ( dhcphdr->chaddr, netdev->ll_addr, hlen );
/* Initialise DHCP packet structure */
dhcppkt->dhcphdr = dhcphdr;
@ -494,6 +503,14 @@ struct dhcp_netdev_desc {
uint16_t device;
} __attribute__ (( packed ));
/** DHCP client identifier */
struct dhcp_client_id {
/** Link-layer protocol */
uint8_t ll_proto;
/** Link-layer address */
uint8_t ll_addr[MAX_LL_ADDR_LEN];
} __attribute__ (( packed ));
/**
* Create DHCP request
*
@ -511,7 +528,9 @@ int create_dhcp_request ( struct net_device *netdev, int msgtype,
struct dhcp_packet *dhcppkt ) {
struct device_description *desc = &netdev->dev->desc;
struct dhcp_netdev_desc dhcp_desc;
struct dhcp_client_id client_id;
size_t dhcp_features_len;
size_t ll_addr_len;
int rc;
/* Create DHCP packet */
@ -570,6 +589,21 @@ int create_dhcp_request ( struct net_device *netdev, int msgtype,
return rc;
}
/* Add DHCP client identifier. Required for Infiniband, and
* doesn't hurt other link layers.
*/
client_id.ll_proto = netdev->ll_protocol->ll_proto;
ll_addr_len = netdev->ll_protocol->ll_addr_len;
assert ( ll_addr_len <= sizeof ( client_id.ll_addr ) );
memcpy ( client_id.ll_addr, netdev->ll_addr, ll_addr_len );
if ( ( rc = set_dhcp_packet_option ( dhcppkt, DHCP_CLIENT_ID,
&client_id,
( ll_addr_len + 1 ) ) ) != 0 ) {
DBG ( "DHCP could not set client ID: %s\n",
strerror ( rc ) );
return rc;
}
return 0;
}