Simplify TX datapath.

src/include/gpxe/arp.h

  */
 
 struct net_device;
-struct net_header;
-struct ll_header;
+struct net_protocol;
 
 extern int arp_resolve ( struct net_device *netdev,
-			 const struct net_header *nethdr,
-			 struct ll_header *llhdr );
+			 struct net_protocol *net_protocol,
+			 const void *dest_net_addr,
+			 const void *source_net_addr,
+			 void *dest_ll_addr );
 
 #endif /* _GPXE_ARP_H */

src/include/gpxe/ip.h

 
 extern struct net_protocol ipv4_protocol;
 
+extern int add_ipv4_address ( struct net_device *netdev,
+			      struct in_addr address, struct in_addr netmask,
+			      struct in_addr gateway );
+extern void del_ipv4_address ( struct net_device *netdev );
+extern int ipv4_uip_transmit ( struct pk_buff *pkb );
+
 #endif /* _GPXE_IP_H */

src/include/gpxe/netdevice.h

 struct net_protocol {
 	/** Protocol name */
 	const char *name;
-	/**
-	 * Perform network-layer routing
-	 *
-	 * @v pkb	Packet buffer
-	 * @v nethdr	Generic network-layer header
-	 * @ret rc	Return status code
-	 *
-	 * 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 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 );
 	/**
 	 * Process received packet
 	 *
 	/** 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
+	 * Transmit network-layer packet via network device
 	 *
-	 * This method should construct the generic link-layer header
-	 * based on the generic network-layer header.
 	 *
-	 * If a link-layer header cannot be constructed (e.g. because
-	 * of a missing ARP cache entry), then this method should
-	 * return an error (after transmitting an ARP request, if
-	 * applicable).
-	 */
-	int ( * route ) ( struct net_device *netdev,
-			  const struct net_header *nethdr,
-			  struct ll_header *llhdr );
-	/**
-	 * Fill media-specific link-layer header
-	 *
-	 * @v llhdr	Generic link-layer header
-	 * @v pkb	Packet buffer
+	 * @v pkb		Packet buffer
+	 * @v netdev		Network device
+	 * @v net_protocol	Network-layer protocol
+	 * @v ll_dest		Link-layer destination address
+	 * @ret rc		Return status code
 	 *
-	 * This method should fill in the link-layer header in the
-	 * packet buffer based on information in the generic
-	 * link-layer header.
+	 * This method should prepend in the link-layer header
+	 * (e.g. the Ethernet DIX header) and transmit the packet.
 	 */
-	void ( * fill_llh ) ( const struct ll_header *llhdr,
-			      struct pk_buff *pkb );
+	int ( * transmit ) ( struct pk_buff *pkb, struct net_device *netdev,
+			     struct net_protocol *net_protocol,
+			     const void *ll_dest );
 	/**
 	 * Parse media-specific link-layer header
 	 *
 	uint16_t ll_proto;
 	/** Link-layer address length */
 	uint8_t ll_addr_len;
-	/** Link-layer header length */
-	uint8_t ll_header_len;
+	/** Link-layer broadcast address */
+	const uint8_t *ll_broadcast;
 };
 
 /**
 	static_single_netdev.priv = priv_data;	\
 	&static_single_netdev; } )
 
-/**
- * Register network device
- *
- * @v netdev		Network device
- * @ret rc		Return status code
- *
- * Adds the network device to the list of network devices.
- */
-static inline int
-register_netdev ( struct net_device *netdev __attribute__ (( unused )) ) {
-	return 0;
-}
-
-/**
- * Unregister network device
- *
- * @v netdev		Network device
- *
- * Removes the network device from the list of network devices.
- */
-static inline void 
-unregister_netdev ( struct net_device *netdev __attribute__ (( unused )) ) {
-	/* Nothing to do */
-}
-
 /**
  * Free network device
  *
 	return netdev->transmit ( netdev, pkb );
 }
 
+/**
+ * Transmit network-layer packet
+ *
+ * @v pkb		Packet buffer
+ * @v netdev		Network device
+ * @v net_protocol	Network-layer protocol
+ * @v ll_dest		Destination link-layer address
+ * @ret rc		Return status code
+ *
+ * Prepends link-layer headers to the packet buffer and transmits the
+ * packet via the specified network device.  This function takes
+ * ownership of the packet buffer.
+ */
+static inline int net_transmit ( struct pk_buff *pkb,
+				 struct net_device *netdev,
+				 struct net_protocol *net_protocol,
+				 const void *ll_dest ) {
+	return netdev->ll_protocol->transmit ( pkb, netdev, net_protocol,
+					       ll_dest );
+}
+
 /**
  * Register a link-layer protocol
  *
 #define STATIC_SINGLE_NETDEV_ADDRESS( address ) \
 	struct net_address address __table ( sgl_netdev_addresses, 01 )
 
+extern int register_netdev ( struct net_device *netdev );
+extern void unregister_netdev ( struct net_device *netdev );
 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 struct pk_buff * net_rx_dequeue ( void );
 extern int net_rx_process ( struct pk_buff *pkb );

src/net/aoe.c

 #include <byteswap.h>
 #include <gpxe/list.h>
 #include <gpxe/if_ether.h>
+#include <gpxe/ethernet.h>
 #include <gpxe/pkbuff.h>
 #include <gpxe/uaccess.h>
 #include <gpxe/ata.h>
 
 	/* Send packet */
 	start_timer ( &aoe->timer );
-	return net_transmit_via ( pkb, aoe->netdev );
+	return net_transmit ( pkb, aoe->netdev, &aoe_protocol, aoe->target );
 }
 
 /**
 	return rc;
 }
 
-/**
- * Perform AoE network-layer routing
- *
- * @v pkb	Packet buffer
- * @ret source	Network-layer source address
- * @ret dest	Network-layer destination address
- * @ret rc	Return status code
- */
-static int aoe_route ( const struct pk_buff *pkb __unused,
-		       struct net_header *nethdr ) {
-	struct aoehdr *aoehdr = pkb->data;
-	struct aoe_session *aoe;
-
-	list_for_each_entry ( aoe, &aoe_sessions, list ) {
-		if ( ( ntohs ( aoehdr->major ) == aoe->major ) &&
-		     ( aoehdr->minor == aoe->minor ) ) {
-			nethdr->flags = PKT_FL_RAW_ADDR;
-			memcpy ( nethdr->dest_net_addr, aoe->target,
-				 sizeof ( aoe->target ) );
-			return 0;
-		}
-	}
-		
-	return -EHOSTUNREACH;
-}
-
 /** AoE protocol */
 struct net_protocol aoe_protocol = {
 	.name = "AoE",
 	.net_proto = htons ( ETH_P_AOE ),
 	.rx_process = aoe_rx,
-	.route = aoe_route,
 };
 
 NET_PROTOCOL ( aoe_protocol );
  * @v aoe		AoE session
  */
 void aoe_open ( struct aoe_session *aoe ) {
-	memset ( aoe->target, 0xff, sizeof ( aoe->target ) );
+	memcpy ( aoe->target, ethernet_protocol.ll_broadcast,
+		 sizeof ( aoe->target ) );
 	aoe->tag = AOE_TAG_MAGIC;
 	aoe->timer.expired = aoe_timer_expired;
 	list_add ( &aoe->list, &aoe_sessions );

src/net/arp.c

  * Look up media-specific link-layer address in the ARP cache
  *
  * @v netdev		Network device
- * @v nethdr		Generic network-layer header
- * @ret llhdr		Generic link-layer header
+ * @v net_protocol	Network-layer protocol
+ * @v dest_net_addr	Destination network-layer address
+ * @v source_net_addr	Source network-layer address
+ * @ret dest_ll_addr	Destination link layer address
  * @ret rc		Return status code
  *
  * This function will use the ARP cache to look up the link-layer
- * address for the link-layer protocol specified in @c llhdr and the
- * network-layer protocol and address as specified in @c nethdr.  If
+ * address for the link-layer protocol associated with the network
+ * device and the given network-layer protocol and addresses.  If
  * found, the destination link-layer address will be filled in in @c
- * llhdr.
+ * dest_ll_addr.
  *
  * If no address is found in the ARP cache, an ARP request will be
  * transmitted on the specified network device and -ENOENT will be
  * returned.
  */
-int arp_resolve ( struct net_device *netdev, const struct net_header *nethdr,
-		  struct ll_header *llhdr ) {
-	struct net_protocol *net_protocol = nethdr->net_protocol;
-	struct ll_protocol *ll_protocol = llhdr->ll_protocol;
+int arp_resolve ( struct net_device *netdev, struct net_protocol *net_protocol,
+		  const void *dest_net_addr, const void *source_net_addr,
+		  void *dest_ll_addr ) {
+	struct ll_protocol *ll_protocol = netdev->ll_protocol;
 	const struct arp_entry *arp;
 	struct pk_buff *pkb;
 	struct arphdr *arphdr;
 	int rc;
 
 	/* Look for existing entry in ARP table */
-	arp = arp_find_entry ( ll_protocol, net_protocol,
-			       nethdr->dest_net_addr );
+	arp = arp_find_entry ( ll_protocol, net_protocol, dest_net_addr );
 	if ( arp ) {
 		DBG ( "ARP cache hit: %s %s => %s %s\n",
 		      net_protocol->name, net_protocol->ntoa ( arp->net_addr ),
 		      ll_protocol->name, ll_protocol->ntoa ( arp->ll_addr ) );
-		memcpy ( llhdr->dest_ll_addr, arp->ll_addr,
-			 sizeof ( llhdr->dest_ll_addr ) );
+		memcpy ( dest_ll_addr, arp->ll_addr, ll_protocol->ll_addr_len);
 		return 0;
 	}
 	DBG ( "ARP cache miss: %s %s\n", net_protocol->name,
-	      net_protocol->ntoa ( nethdr->dest_net_addr ) );
+	      net_protocol->ntoa ( dest_net_addr ) );
 
 	/* Allocate ARP packet */
 	pkb = alloc_pkb ( MAX_LL_HEADER_LEN + sizeof ( *arphdr ) +
 	arphdr->ar_pln = net_protocol->net_addr_len;
 	arphdr->ar_op = htons ( ARPOP_REQUEST );
 	memcpy ( pkb_put ( pkb, ll_protocol->ll_addr_len ),
-		 llhdr->source_ll_addr, ll_protocol->ll_addr_len );
+		 netdev->ll_addr, ll_protocol->ll_addr_len );
 	memcpy ( pkb_put ( pkb, net_protocol->net_addr_len ),
-		 nethdr->source_net_addr, net_protocol->net_addr_len );
+		 source_net_addr, net_protocol->net_addr_len );
 	memset ( pkb_put ( pkb, ll_protocol->ll_addr_len ),
 		 0, ll_protocol->ll_addr_len );
 	memcpy ( pkb_put ( pkb, net_protocol->net_addr_len ),
-		 nethdr->dest_net_addr, net_protocol->net_addr_len );
+		 dest_net_addr, net_protocol->net_addr_len );
 
 	/* Transmit ARP request */
-	if ( ( rc = net_transmit_via ( pkb, netdev ) ) != 0 )
+	if ( ( rc = net_transmit ( pkb, netdev, &arp_protocol, 
+				   ll_protocol->ll_broadcast ) ) != 0 )
 		return rc;
 
 	return -ENOENT;
 	arphdr->ar_op = htons ( ARPOP_REPLY );
 	memswap ( arp_sender_ha ( arphdr ), arp_target_ha ( arphdr ),
 		 arphdr->ar_hln + arphdr->ar_pln );
-	memcpy ( arp_target_ha ( arphdr ), netdev->ll_addr, arphdr->ar_hln );
+	memcpy ( arp_sender_ha ( arphdr ), netdev->ll_addr, arphdr->ar_hln );
 
 	/* Send reply */
-	net_transmit_via ( pkb, netdev );
+	net_transmit ( pkb, netdev, &arp_protocol, arp_target_ha (arphdr ) );
 	pkb = NULL;
 
  done:
 	return 0;
 }
 
-/**
- * Perform ARP network-layer routing
- *
- * @v pkb	Packet buffer
- * @ret source	Network-layer source address
- * @ret dest	Network-layer destination address
- * @ret rc	Return status code
- */
-static int arp_route ( const struct pk_buff *pkb,
-		       struct net_header *nethdr ) {
-	struct arphdr *arphdr = pkb->data;
-
-	memcpy ( nethdr->source_net_addr, arp_sender_ha ( arphdr ),
-		 arphdr->ar_hln );
-	memcpy ( nethdr->dest_net_addr, arp_target_ha ( arphdr ),
-		 arphdr->ar_hln );
-	nethdr->flags = PKT_FL_RAW_ADDR;
-	if ( arphdr->ar_op == htons ( ARPOP_REQUEST ) )
-		nethdr->flags |= PKT_FL_BROADCAST;
-	
-	return 0;
-}
-
 /**
  * Transcribe ARP address
  *
 	.name = "ARP",
 	.net_proto = htons ( ETH_P_ARP ),
 	.rx_process = arp_rx,
-	.route = arp_route,
 	.ntoa = arp_ntoa,
 };
 

src/net/ethernet.c

 #include <gpxe/if_ether.h>
 #include <gpxe/netdevice.h>
 #include <gpxe/pkbuff.h>
-#include <gpxe/arp.h>
 #include <gpxe/ethernet.h>
 
 /** @file
 static uint8_t eth_broadcast[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
 
 /**
- * Perform Ethernet routing
+ * Transmit Ethernet packet
  *
- * @v nethdr	Generic network-layer header
- * @ret llhdr	Generic link-layer header
- * @ret rc	Return status code
+ * @v pkb		Packet buffer
+ * @v netdev		Network device
+ * @v net_protocol	Network-layer protocol
+ * @v ll_dest		Link-layer destination address
  *
- * Constructs the generic link-layer header based on the generic
- * network-layer header, i.e. maps network-layer addresses (e.g. IPv4
- * addresses) to MAC addresses.
- *
- * If the destination MAC address cannot be determined, an ARP request
- * is sent for the requested network-layer address and -ENOENT is
- * returned.
- */
-static int eth_route ( struct net_device *netdev,
-		       const struct net_header *nethdr,
-		       struct ll_header *llhdr ) {
-	int rc;
-
-	/* Fill in the easy bits */
-	llhdr->net_proto = nethdr->net_protocol->net_proto;
-	memcpy ( llhdr->source_ll_addr, netdev->ll_addr, ETH_ALEN );
-
-	/* Work out the destination MAC address */
-	if ( nethdr->flags & PKT_FL_BROADCAST ) {
-		memcpy ( llhdr->dest_ll_addr, eth_broadcast, ETH_ALEN );
-	} else if ( nethdr->flags & PKT_FL_RAW_ADDR ) {
-		memcpy ( llhdr->dest_ll_addr, nethdr->dest_net_addr, ETH_ALEN);
-	} else if ( nethdr->flags & PKT_FL_MULTICAST ) {
-		/* IP multicast is a special case; there exists a
-		 * direct mapping from IP address to MAC address
-		 */
-		assert ( nethdr->net_protocol->net_proto == htons(ETH_P_IP) );
-		llhdr->dest_ll_addr[0] = 0x01;
-		llhdr->dest_ll_addr[1] = 0x00;
-		llhdr->dest_ll_addr[2] = 0x5e;
-		llhdr->dest_ll_addr[3] = nethdr->dest_net_addr[1] & 0x7f;
-		llhdr->dest_ll_addr[4] = nethdr->dest_net_addr[2];
-		llhdr->dest_ll_addr[5] = nethdr->dest_net_addr[3];
-	} else {
-		/* Otherwise, look up the address using ARP */
-		if ( ( rc = arp_resolve ( netdev, nethdr, llhdr ) ) != 0 )
-			return rc;
-	}
-
-	return 0;
-}
-
-/**
- * Fill in Ethernet link-layer header
- *
- * @v pkb	Packet buffer
- * @v llhdr	Generic link-layer header
- *
- * Fills in the Ethernet link-layer header in the packet buffer based
- * on information in the generic link-layer header.
+ * Prepends the Ethernet link-layer header and transmits the packet.
  */
-static void eth_fill_llh ( const struct ll_header *llhdr,
-			   struct pk_buff *pkb ) {
-	struct ethhdr *ethhdr = pkb->data;
-
-	memcpy ( ethhdr->h_dest, llhdr->dest_ll_addr, ETH_ALEN );
-	memcpy ( ethhdr->h_source, llhdr->source_ll_addr, ETH_ALEN );
-	ethhdr->h_protocol = llhdr->net_proto;
+static int eth_transmit ( struct pk_buff *pkb, struct net_device *netdev,
+			  struct net_protocol *net_protocol,
+			  const void *ll_dest ) {
+	struct ethhdr *ethhdr = pkb_push ( pkb, ETH_HLEN );
+
+	memcpy ( ethhdr->h_dest, ll_dest, ETH_ALEN );
+	memcpy ( ethhdr->h_source, netdev->ll_addr, ETH_ALEN );
+	ethhdr->h_protocol = net_protocol->net_proto;
+	return netdev_transmit ( netdev, pkb );
 }
 
 /**
  */
 static const char * eth_ntoa ( const void *ll_addr ) {
 	static char buf[18]; /* "00:00:00:00:00:00" */
-	uint8_t *eth_addr = ll_addr;
+	const uint8_t *eth_addr = ll_addr;
 
 	sprintf ( buf, "%02x:%02x:%02x:%02x:%02x:%02x",
 		  eth_addr[0], eth_addr[1], eth_addr[2],
 
 /** Ethernet protocol */
 struct ll_protocol ethernet_protocol = {
-	.name = "Ethernet",
-	.ll_proto = htons ( ARPHRD_ETHER ),
-	.ll_addr_len = ETH_ALEN,
-	.ll_header_len = ETH_HLEN,
-	.route = eth_route,
-	.fill_llh = eth_fill_llh,
-	.parse_llh = eth_parse_llh,
-	.ntoa = eth_ntoa,
+	.name		= "Ethernet",
+	.ll_proto	= htons ( ARPHRD_ETHER ),
+	.ll_addr_len	= ETH_ALEN,
+	.ll_broadcast	= eth_broadcast,
+	.transmit	= eth_transmit,
+	.parse_llh	= eth_parse_llh,
+	.ntoa		= eth_ntoa,
 };
 
 LL_PROTOCOL ( ethernet_protocol );

src/net/ipv4.c

 #include <stdint.h>
 #include <errno.h>
 #include <byteswap.h>
+#include <malloc.h>
 #include <vsprintf.h>
+#include <gpxe/list.h>
 #include <gpxe/in.h>
-
+#include <gpxe/arp.h>
 
 #include <ip.h>
 
 #include <gpxe/pkbuff.h>
 #include <gpxe/netdevice.h>
 #include "uip/uip.h"
+#include <gpxe/ip.h>
 
 /** @file
  *
 
 struct net_protocol ipv4_protocol;
 
-/** An IPv4 routing table entry */
-struct ipv4_route {
-	/** Network address */
-	struct in_addr network;
+/** An IPv4 address/routing table entry */
+struct ipv4_miniroute {
+	/** List of miniroutes */
+	struct list_head list;
+	/** Network device */
+	struct net_device *netdev;
+	/** IPv4 address */
+	struct in_addr address;
 	/** Subnet mask */
 	struct in_addr netmask;
 	/** Gateway address */
 	struct in_addr gateway;
-	/** Gateway device */
-	struct in_addr gatewaydev;
-};
-
-enum {
-	STATIC_SINGLE_NETDEV_ROUTE = 0,
-	DEFAULT_ROUTE,
-	NUM_ROUTES
 };
 
-/** IPv4 routing table */
-static struct ipv4_route routing_table[NUM_ROUTES];
-
-#define routing_table_end ( routing_table + NUM_ROUTES )
+/** List of IPv4 miniroutes */
+static LIST_HEAD ( miniroutes );
 
-#if 0
 /**
- * Set IP address
+ * Add IPv4 interface
  *
- */
-void set_ipaddr ( struct in_addr address ) {
-	union {
-		struct in_addr address;
-		uint16_t uip_address[2];
-	} u;
-
-	u.address = address;
-	uip_sethostaddr ( u.uip_address );
-}
-
-/**
- * Set netmask
+ * @v netdev	Network device
+ * @v address	IPv4 address
+ * @v netmask	Subnet mask
+ * @v gateway	Gateway address (or @c INADDR_NONE for no gateway)
+ * @ret rc	Return status code
  *
  */
-void set_netmask ( struct in_addr address ) {
-	union {
-		struct in_addr address;
-		uint16_t uip_address[2];
-	} u;
-
-	u.address = address;
-	uip_setnetmask ( u.uip_address );
+int add_ipv4_address ( struct net_device *netdev, struct in_addr address,
+		       struct in_addr netmask, struct in_addr gateway ) {
+	struct ipv4_miniroute *miniroute;
+
+	/* Allocate and populate miniroute structure */
+	miniroute = malloc ( sizeof ( *miniroute ) );
+	if ( ! miniroute )
+		return -ENOMEM;
+	miniroute->netdev = netdev;
+	miniroute->address = address;
+	miniroute->netmask = netmask;
+	miniroute->gateway = gateway;
+	
+	/* Add to end of list if we have a gateway, otherwise to start
+	 * of list.
+	 */
+	if ( gateway.s_addr != INADDR_NONE ) {
+		list_add_tail ( &miniroute->list, &miniroutes );
+	} else {
+		list_add ( &miniroute->list, &miniroutes );
+	}
+	return 0;
 }
 
 /**
- * Set default gateway
+ * Remove IPv4 interface
  *
+ * @v netdev	Network device
  */
-void set_gateway ( struct in_addr address ) {
-	union {
-		struct in_addr address;
-		uint16_t uip_address[2];
-	} u;
+void del_ipv4_address ( struct net_device *netdev ) {
+	struct ipv4_miniroute *miniroute;
 
-	u.address = address;
-	uip_setdraddr ( u.uip_address );
+	list_for_each_entry ( miniroute, &miniroutes, list ) {
+		if ( miniroute->netdev == netdev ) {
+			list_del ( &miniroute->list );
+			break;
+		}
+	}
 }
 
 /**
- * Run the TCP/IP stack
- *
- * Call this function in a loop in order to allow TCP/IP processing to
- * take place.  This call takes the stack through a single iteration;
- * it will typically be used in a loop such as
- *
- * @code
+ * Transmit packet constructed by uIP
  *
- * struct tcp_connection *my_connection;
- * ...
- * tcp_connect ( my_connection );
- * while ( ! my_connection->finished ) {
- *   run_tcpip();
- * }
- *
- * @endcode
+ * @v pkb		Packet buffer
+ * @ret rc		Return status code
  *
- * where @c my_connection->finished is set by one of the connection's
- * #tcp_operations methods to indicate completion.
  */
-void run_tcpip ( void ) {
-	void *data;
-	size_t len;
-	uint16_t type;
-	int i;
-	
-	if ( netdev_poll ( 1, &data, &len ) ) {
-		/* We have data */
-		memcpy ( uip_buf, data, len );
-		uip_len = len;
-		type = ntohs ( *( ( uint16_t * ) ( uip_buf + 12 ) ) );
-		if ( type == UIP_ETHTYPE_ARP ) {
-			uip_arp_arpin();
-		} else {
-			uip_arp_ipin();
-			uip_input();
+int ipv4_uip_transmit ( struct pk_buff *pkb ) {
+	struct iphdr *iphdr = pkb->data;
+	struct ipv4_miniroute *miniroute;
+	struct net_device *netdev = NULL;
+	struct in_addr next_hop;
+	struct in_addr source;
+	uint8_t ll_dest_buf[MAX_LL_ADDR_LEN];
+	const uint8_t *ll_dest = ll_dest_buf;
+	int rc;
+
+	/* Use routing table to identify next hop and transmitting netdev */
+	next_hop = iphdr->dest;
+	list_for_each_entry ( miniroute, &miniroutes, list ) {
+		if ( ( ( ( iphdr->dest.s_addr ^ miniroute->address.s_addr ) &
+			 miniroute->netmask.s_addr ) == 0 ) ||
+		     ( miniroute->gateway.s_addr != INADDR_NONE ) ) {
+			netdev = miniroute->netdev;
+			source = miniroute->address;
+			if ( miniroute->gateway.s_addr != INADDR_NONE )
+				next_hop = miniroute->gateway;
+			break;
 		}
-		if ( uip_len > 0 )
-			uip_transmit();
+	}
+
+	/* Abort if no network device identified */
+	if ( ! netdev ) {
+		DBG ( "No route to %s\n", inet_ntoa ( iphdr->dest ) );
+		rc = -EHOSTUNREACH;
+		goto err;
+	}
+
+	/* Determine link-layer destination address */
+	if ( next_hop.s_addr == INADDR_BROADCAST ) {
+		/* Broadcast address */
+		ll_dest = netdev->ll_protocol->ll_broadcast;
+	} else if ( IN_MULTICAST ( next_hop.s_addr ) ) {
+		/* Special case: IPv4 multicast over Ethernet.  This
+		 * code may need to be generalised once we find out
+		 * what happens for other link layers.
+		 */
+		uint8_t *next_hop_bytes = ( uint8_t * ) &next_hop;
+		ll_dest_buf[0] = 0x01;
+		ll_dest_buf[0] = 0x00;
+		ll_dest_buf[0] = 0x5e;
+		ll_dest_buf[3] = next_hop_bytes[1] & 0x7f;
+		ll_dest_buf[4] = next_hop_bytes[2];
+		ll_dest_buf[5] = next_hop_bytes[3];
 	} else {
-		for ( i = 0 ; i < UIP_CONNS ; i++ ) {
-			uip_periodic ( i );
-			if ( uip_len > 0 )
-				uip_transmit();
+		/* Unicast address: resolve via ARP */
+		if ( ( rc = arp_resolve ( netdev, &ipv4_protocol, &next_hop,
+					  &source, ll_dest_buf ) ) != 0 ) {
+			DBG ( "No ARP entry for %s\n",
+			      inet_ntoa ( iphdr->dest ) );
+			goto err;
 		}
 	}
+	
+	/* Hand off to link layer */
+	return net_transmit ( pkb, netdev, &ipv4_protocol, ll_dest );
+
+ err:
+	free_pkb ( pkb );
+	return rc;
 }
-#endif
 
 /**
  * Process incoming IP packets
 		pkb = alloc_pkb ( MAX_LL_HEADER_LEN + uip_len );
 		if ( ! pkb )
 			return -ENOMEM;
-		pkb->net_protocol = &ipv4_protocol;
 		pkb_reserve ( pkb, MAX_LL_HEADER_LEN );
 		memcpy ( pkb_put ( pkb, uip_len ), uip_buf, uip_len );
-		net_transmit ( pkb );
+		ipv4_uip_transmit ( pkb );
 	}
 	return 0;
 }
 
 /**
- * Perform IP layer routing
+ * Convert IPv4 address to dotted-quad notation
  *
- * @v pkb	Packet buffer
- * @ret source	Network-layer source address
- * @ret dest	Network-layer destination address
- * @ret rc	Return status code
+ * @v in	IP address
+ * @ret string	IP address in dotted-quad notation
  */
-static int ipv4_route ( const struct pk_buff *pkb,
-			struct net_header *nethdr ) {
-	struct iphdr *iphdr = pkb->data;
-	struct in_addr *source = ( struct in_addr * ) nethdr->source_net_addr;
-	struct in_addr *dest = ( struct in_addr * ) nethdr->dest_net_addr;
-	struct ipv4_route *route;
-
-	/* Route IP packet according to routing table */
-	source->s_addr = INADDR_NONE;
-	dest->s_addr = iphdr->dest.s_addr;
-	for ( route = routing_table ; route < routing_table_end ; route++ ) {
-		if ( ( dest->s_addr & route->netmask.s_addr )
-		     == route->network.s_addr ) {
-			source->s_addr = route->gatewaydev.s_addr;
-			if ( route->gateway.s_addr )
-				dest->s_addr = route->gateway.s_addr;
-			break;
-		}
-	}
-
-	/* Set broadcast and multicast flags as applicable */
-	nethdr->flags = 0;
-	if ( dest->s_addr == htonl ( INADDR_BROADCAST ) ) {
-		nethdr->flags = PKT_FL_BROADCAST;
-	} else if ( IN_MULTICAST ( dest->s_addr ) ) {
-		nethdr->flags = PKT_FL_MULTICAST;
-	}
-
-	return 0;
+char * inet_ntoa ( struct in_addr in ) {
+	static char buf[16]; /* "xxx.xxx.xxx.xxx" */
+	uint8_t *bytes = ( uint8_t * ) &in;
+	
+	sprintf ( buf, "%d.%d.%d.%d", bytes[0], bytes[1], bytes[2], bytes[3] );
+	return buf;
 }
 
 /**
  *
  */
 static const char * ipv4_ntoa ( const void *net_addr ) {
-	static char buf[16]; /* "xxx.xxx.xxx.xxx" */
-	uint8_t *ip_addr = net_addr;
-
-	sprintf ( buf, "%d.%d.%d.%d", ip_addr[0], ip_addr[1], ip_addr[2],
-		  ip_addr[3] );
-	return buf;
+	return inet_ntoa ( * ( ( struct in_addr * ) net_addr ) );
 }
 
 /** IPv4 protocol */
 	.net_proto = htons ( ETH_P_IP ),
 	.net_addr_len = sizeof ( struct in_addr ),
 	.rx_process = ipv4_rx,
-	.route = ipv4_route,
 	.ntoa = ipv4_ntoa,
 };
 
 };
 
 STATIC_SINGLE_NETDEV_ADDRESS ( static_single_ipv4_address );
-
-#warning "Remove this static-IP hack"
-static struct ipv4_route routing_table[NUM_ROUTES] = {
-	{ { htonl ( 0x0afefe00 ) }, { htonl ( 0xfffffffc ) },
-	  { htonl ( 0x00000000 ) }, { htonl ( 0x0afefe01 ) } },
-	{ { htonl ( 0x00000000 ) }, { htonl ( 0x00000000 ) },
-	  { htonl ( 0x0afefe02 ) }, { htonl ( 0x0afefe01 ) } },
-};
-

src/net/netdevice.c

 /** Recevied packet queue */
 static LIST_HEAD ( rx_queue );
 
+#warning "Remove this static IP address hack"
+#include <ip.h>
+#include <gpxe/ip.h>
+
+/**
+ * Register network device
+ *
+ * @v netdev		Network device
+ * @ret rc		Return status code
+ *
+ * Adds the network device to the list of network devices.
+ */
+int register_netdev ( struct net_device *netdev ) {
+	
+#warning "Remove this static IP address hack"
+	{
+		const struct in_addr static_address = { htonl ( 0x0afefe01 ) };
+		const struct in_addr static_netmask = { htonl ( 0xffffff00 ) };
+		const struct in_addr static_gateway = { INADDR_NONE };
+		int rc;
+		
+		if ( ( rc = add_ipv4_address ( netdev, static_address,
+					       static_netmask,
+					       static_gateway ) ) != 0 )
+			return rc;
+	}
+
+	return 0;
+}
+
+/**
+ * Unregister network device
+ *
+ * @v netdev		Network device
+ *
+ * Removes the network device from the list of network devices.
+ */
+void unregister_netdev ( struct net_device *netdev ) {
+
+#warning "Remove this static IP address hack"
+	del_ipv4_address ( netdev );
+
+}
+
 /**
  * Add packet to receive queue
  *
 	return NULL;
 }
 
-/**
- * Transmit packet via a network device
- *
- * @v pkb		Packet buffer
- * @v netdev		Network device, or NULL
- * @ret rc		Return status code
- *
- * Transmits the packet via the specified network device.  The packet
- * must begin with a network-layer header, and the @c net_protocol
- * field must have been filled in.  If @c netdev is NULL, the network
- * device is identified via the packet contents, if possible.  This
- * function takes ownership of the packet buffer.
- */
-int net_transmit_via ( struct pk_buff *pkb, struct net_device *netdev ) {
-	struct net_protocol *net_protocol;
-	struct net_header nethdr;
-	struct ll_protocol *ll_protocol;
-	struct ll_header llhdr;
-	int rc;
-
-	/* Perform network-layer routing */
-	net_protocol = pkb->net_protocol;
-	nethdr.net_protocol = net_protocol;
-	if ( ( rc = net_protocol->route ( pkb, &nethdr ) ) != 0 ) {
-		DBG ( "Could not route to %s address %s\n",
-		      net_protocol->name,
-		      net_protocol->ntoa ( nethdr.dest_net_addr ) );
-		free_pkb ( pkb );
-		return rc;
-	}
-
-	/* Identify transmitting network device, if not specified */
-	if ( ! netdev ) {
-		netdev = find_netdev_by_net_addr ( net_protocol,
-						   nethdr.source_net_addr );
-		if ( ! netdev ) {
-			DBG ( "No network device for %s address %s\n",
-			      net_protocol->name,
-			      net_protocol->ntoa ( nethdr.source_net_addr ) );
-			free_pkb ( pkb );
-			return -EHOSTUNREACH;
-		}
-	}
-
-	/* Perform link-layer routing */
-	ll_protocol = netdev->ll_protocol;
-	llhdr.ll_protocol = ll_protocol;
-	if ( ( rc = ll_protocol->route ( netdev, &nethdr, &llhdr ) ) != 0 ) {
-		DBG ( "No link-layer route to %s address %s\n",
-		      net_protocol->name,
-		      net_protocol->ntoa ( nethdr.dest_net_addr ) );
-		free_pkb ( pkb );
-		return rc;
-	}
-
-	/* Prepend link-layer header */
-	pkb_push ( pkb, ll_protocol->ll_header_len );
-	ll_protocol->fill_llh ( &llhdr, pkb );
-
-	/* Hand off packet to network device */
-	if ( ( rc = netdev->transmit ( netdev, pkb ) ) != 0 ) {
-		DBG ( "Device failed to transmit packet\n" );
-		return rc;
-	}
-	
-	DBG ( "Packet transmitted\n" );
-	return 0;
-}
-
-/**
- * Transmit packet
- *
- * @v pkb		Packet buffer
- * @ret rc		Return status code
- *
- * Transmits the packet via the appropriate network device.  This
- * function takes ownership of the packet buffer.
- */
-int net_transmit ( struct pk_buff *pkb ) {
-	return net_transmit_via ( pkb, NULL );
-}
-
 /**
  * Poll for packet on all network devices
  *
 	pkb->net_protocol = net_protocol;
 	
 	/* Strip off link-layer header */
-	pkb_pull ( pkb, ll_protocol->ll_header_len );
+#warning "Temporary hack"
+	pkb_pull ( pkb, ETH_HLEN );
 	
 	/* Hand off to network layer */
 	if ( ( rc = net_protocol->rx_process ( pkb ) ) != 0 ) {

src/net/tcp.c

 			pkb_reserve ( pkb, MAX_LL_HEADER_LEN );
 			pkb_put ( pkb, uip_len );
 			memcpy ( pkb->data, uip_buf, uip_len );
-			pkb->net_protocol = &ipv4_protocol;
-			
-			net_transmit ( pkb );
+
+			ipv4_uip_transmit ( pkb );
 		}
 	}
 }