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Network layer now works as a proof of concept

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This commit is contained in:
Michael Brown
2006-04-28 14:13:50 +00:00
parent 1488cd3b73
commit 129c6c3968
6 changed files with 291 additions and 111 deletions
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4
src/include/gpxe/arp.h
View File

@@ -7,10 +7,12 @@
*
*/
struct net_device;
struct net_header;
struct ll_header;
extern int arp_resolve ( const struct net_header *nethdr,
extern int arp_resolve ( struct net_device *netdev,
const struct net_header *nethdr,
struct ll_header *llhdr );
#endif /* _GPXE_ARP_H */

107
src/include/gpxe/netdevice.h
View File

@@ -11,12 +11,16 @@
#include <gpxe/tables.h>
struct pk_buff;
struct net_device;
struct net_protocol;
struct ll_protocol;
/** Maximum length of a link-layer address */
#define MAX_LL_ADDR_LEN 6
/** Maximum length of a link-layer header */
#define MAX_LL_HEADER_LEN 16
/** Maximum length of a network-layer address */
#define MAX_NET_ADDR_LEN 4
@@ -32,37 +36,37 @@ struct ll_protocol;
struct net_header {
/** Network-layer protocol */
struct net_protocol *net_protocol;
/** Destination address flags
/** Flags
*
* This is the bitwise OR of zero or more NETADDR_FL_XXX
* This is the bitwise OR of zero or more PKT_FL_XXX
* values.
*/
int dest_flags;
int flags;
/** Network-layer destination address */
uint8_t dest_net_addr[MAX_NET_ADDR_LEN];
/** Network-layer source address */
uint8_t source_net_addr[MAX_NET_ADDR_LEN];
};
/** Address is a broadcast address */
#define NETADDR_FL_BROADCAST 0x01
/** Packet is a broadcast packet */
#define PKT_FL_BROADCAST 0x01
/** Address is a multicast address */
#define NETADDR_FL_MULTICAST 0x02
/** Packet is a multicast packet */
#define PKT_FL_MULTICAST 0x02
/** Address is a raw hardware address */
#define NETADDR_FL_RAW 0x04
/** Addresses are raw hardware addresses */
#define PKT_FL_RAW_ADDR 0x04
/** A generic link-layer header */
struct ll_header {
/** Link-layer protocol */
struct ll_protocol *ll_protocol;
/** Destination address flags
/** Flags
*
* This is the bitwise OR of zero or more NETADDR_FL_XXX
* This is the bitwise OR of zero or more PKT_FL_XXX
* values.
*/
int dest_flags;
int flags;
/** Link-layer destination address */
uint8_t dest_ll_addr[MAX_LL_ADDR_LEN];
/** Link-layer source address */
@@ -80,21 +84,21 @@ struct ll_header {
*
*/
struct net_protocol {
/** Protocol name */
const char *name;
/**
* Perform network-layer routing
*
* @v pkb Packet buffer
* @ret source Network-layer source address
* @ret dest Network-layer destination address
* @v nethdr Generic network-layer header
* @ret rc Return status code
*
* This method should fill in the source and destination
* addresses with enough information to allow the link layer
* to route the packet.
* This method should fill in the network header with enough
* information to allow the link layer to route the packet.
*
* For example, in the case of IPv4, this method should fill
* in @c source with the IP addresses of the local adapter and
* @c dest with the next hop destination (e.g. the gateway).
* in the IP addresses of the local adapter and the next hop
* destination (e.g. the gateway).
*/
int ( * route ) ( const struct pk_buff *pkb,
struct net_header *nethdr );
@@ -108,6 +112,19 @@ struct net_protocol {
* the packet buffer.
*/
int ( * rx ) ( struct pk_buff *pkb );
/**
* Transcribe network-layer address
*
* @v net_addr Network-layer address
* @ret string Human-readable transcription of address
*
* This method should convert the network-layer address into a
* human-readable format (e.g. dotted quad notation for IPv4).
*
* The buffer used to hold the transcription is statically
* allocated.
*/
const char * ( *ntoa ) ( const void * net_addr );
/** Network-layer protocol
*
* This is an ETH_P_XXX constant, in network-byte order
@@ -122,9 +139,12 @@ struct net_protocol {
*
*/
struct ll_protocol {
/** Protocol name */
const char *name;
/**
* Perform link-layer routing
*
* @v netdev Network device
* @v nethdr Generic network-layer header
* @ret llhdr Generic link-layer header
* @ret rc Return status code
@@ -137,7 +157,8 @@ struct ll_protocol {
* return an error (after transmitting an ARP request, if
* applicable).
*/
int ( * route ) ( const struct net_header *nethdr,
int ( * route ) ( struct net_device *netdev,
const struct net_header *nethdr,
struct ll_header *llhdr );
/**
* Fill media-specific link-layer header
@@ -164,6 +185,19 @@ struct ll_protocol {
void ( * parse_llh ) ( const struct pk_buff *pkb,
struct ll_header *llhdr );
/**
* Transcribe link-layer address
*
* @v ll_addr Link-layer address
* @ret string Human-readable transcription of address
*
* This method should convert the link-layer address into a
* human-readable format.
*
* The buffer used to hold the transcription is statically
* allocated.
*/
const char * ( *ntoa ) ( const void * ll_addr );
/** Link-layer protocol
*
* This is an ARPHRD_XXX constant, in network byte order.
@@ -290,13 +324,30 @@ free_netdev ( struct net_device *netdev __attribute__ (( unused )) ) {
/* Nothing to do */
}
/**
* Transmit raw packet via network device
*
* @v netdev Network device
* @v pkb Packet buffer
* @ret rc Return status code
*
* Transmits the packet via the specified network device. The
* link-layer header must already have been filled in. If this
* function returns success, it has taken ownership of the packet
* buffer.
*/
static inline int netdev_transmit ( struct net_device *netdev,
struct pk_buff *pkb ) {
return netdev->transmit ( netdev, pkb );
}
/**
* Register a link-layer protocol
*
* @v protocol Link-layer protocol
*/
#define LL_PROTOCOL( protocol ) \
struct ll_protocol protocol __table ( ll_protocols, 00 )
struct ll_protocol protocol __table ( ll_protocols, 01 )
/**
* Register a network-layer protocol
@@ -304,7 +355,7 @@ free_netdev ( struct net_device *netdev __attribute__ (( unused )) ) {
* @v protocol Network-layer protocol
*/
#define NET_PROTOCOL( protocol ) \
struct net_protocol protocol __table ( net_protocols, 00 )
struct net_protocol protocol __table ( net_protocols, 01 )
/**
* Register a network-layer address for the static single network device
@@ -312,15 +363,17 @@ free_netdev ( struct net_device *netdev __attribute__ (( unused )) ) {
* @v net_address Network-layer address
*/
#define STATIC_SINGLE_NETDEV_ADDRESS( address ) \
struct net_address address __table ( sgl_netdev_addresses, 00 )
struct net_address address __table ( sgl_netdev_addresses, 01 )
extern struct net_protocol *net_find_protocol ( uint16_t net_proto );
extern struct net_device * net_find_address ( struct net_protocol *net_proto,
void *net_addr );
extern void netdev_rx ( struct net_device *netdev, struct pk_buff *pkb );
extern struct net_protocol *find_net_protocol ( uint16_t net_proto );
extern struct net_device *
find_netdev_by_net_addr ( struct net_protocol *net_protocol, void *net_addr );
extern int net_transmit_via ( struct pk_buff *pkb, struct net_device *netdev );
extern int net_transmit ( struct pk_buff *pkb );
extern int net_poll ( void );
extern void netdev_rx ( struct net_device *netdev, struct pk_buff *pkb );
extern struct pk_buff * net_rx_dequeue ( void );
#endif /* _GPXE_NETDEVICE_H */