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https://github.com/xcat2/xNBA.git
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added support for processing and transmitting without uIP
This commit is contained in:
Nikhil Chandru Rao
parent
74339b3c6e
commit
90fbff8f34
@ -9,14 +9,40 @@
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#include <ip.h>
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/* IP constants */
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#define IP_HLEN 20
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#define IP_VER 4
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#define IP_MASK_VER 0xf0
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#define IP_MASK_HLEN 0x0f
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#define IP_PSHLEN 12
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/* IP header defaults */
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#define IP_TOS 0
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#define IP_TTL 64
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/* IP6 constants */
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#define IP6_HLEN 38
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struct pk_buff;
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struct net_device;
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struct net_protocol;
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extern struct net_protocol ipv4_protocol;
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extern struct net_protocol ipv6_protocol;
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extern int add_ipv4_address ( struct net_device *netdev,
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struct in_addr address, struct in_addr netmask,
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struct in_addr gateway );
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extern void del_ipv4_address ( struct net_device *netdev );
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extern int ipv4_uip_tx ( struct pk_buff *pkb );
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extern int ipv4_tx ( struct pk_buff *pkb, uint16_t trans_proto, struct in_addr *dest );
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extern int ipv6_tx ( struct pk_buff *pkb, uint16_t trans_proto, struct in6_addr *dest );
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extern void ipv4_rx ( struct pk_buff *pkb, struct net_device *netdev, const void *ll_source );
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extern void ipv6_rx ( struct pk_buff *pkb, struct net_device *netdev, const void *ll_source );
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#endif /* _GPXE_IP_H */
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231
src/net/ipv4.c
231
src/net/ipv4.c
@ -12,6 +12,7 @@
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#include <gpxe/netdevice.h>
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#include "uip/uip.h"
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#include <gpxe/ip.h>
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#include <gpxe/interface.h>
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/** @file
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*
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@ -24,6 +25,9 @@
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*
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*/
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/* Unique IP datagram identification number */
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static uint16_t next_ident = 0;
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struct net_protocol ipv4_protocol;
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/** An IPv4 address/routing table entry */
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@ -93,6 +97,39 @@ void del_ipv4_address ( struct net_device *netdev ) {
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}
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}
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/**
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* Complete the transport-layer checksum
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*
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* Refer to the note made in net/interface.c about this function
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*/
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void ipv4_tx_csum ( struct pk_buff *pkb, uint8_t trans_proto ) {
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struct iphdr *iphdr = pkb->data;
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void *pshdr = malloc ( IP_PSHLEN );
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void *csum_offset = iphdr + IP_HLEN + ( trans_proto == IP_UDP ? 6 : 16 );
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int offset = 0;
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/* Calculate pseudo header */
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memcpy ( pshdr, &iphdr->src, sizeof ( in_addr ) );
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offset += sizeof ( in_addr );
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memcpy ( pshdr + offset, &iphdr->dest, sizeof ( in_addr ) );
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offset += sizeof ( in_addr );
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*( ( uint8_t* ) ( pshdr + offset++ ) ) = 0x00;
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*( ( uint8_t* ) ( pshdr + offset++ ) ) = iphdr->protocol;
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*( ( uint16_t* ) ( pshdr + offset ) ) = pkb_len ( pkb ) - IP_HLEN;
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/* Update the checksum value */
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*( ( uint16_t* ) csum_offset ) = *( ( uint16_t* ) csum_offset ) + calc_chksum ( pshdr, IP_PSHLEN );
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}
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/**
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* Calculate the transport-layer checksum while processing packets
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*/
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uint16_t ipv4_rx_csum ( struct pk_buff *pkb __unused, uint8_t trans_proto __unused ) {
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/** This function needs to be implemented. Until then, it will return 0xffffffff every time */
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return 0xffff;
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}
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/**
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* Transmit packet constructed by uIP
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*
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@ -165,6 +202,132 @@ int ipv4_uip_tx ( struct pk_buff *pkb ) {
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return rc;
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}
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/**
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* Transmit IP packet (without uIP)
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*
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* @v pkb Packet buffer
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* @v trans_proto Transport-layer protocol number
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* @v dest Destination network-layer address
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* @ret rc Status
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*
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* This function expects a transport-layer segment and prepends the IP header
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*/
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int ipv4_tx ( struct pk_buff *pkb, uint16_t trans_proto, struct in_addr *dest ) {
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struct iphdr *iphdr = pkb_push ( pkb, IP_HLEN );
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struct ipv4_miniroute *miniroute;
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struct net_device *netdev = NULL;
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struct in_addr next_hop;
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struct in_addr source;
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uint8_t ll_dest_buf[MAX_LL_ADDR_LEN];
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const uint8_t *ll_dest = ll_dest_buf;
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int rc;
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/* Fill up the IP header, except source address */
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iphdr->verhdrlen = ( IP_VER << 4 ) | ( IP_HLEN / 4 ); /* Version = 4, Header length = 5 */
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iphdr->service = IP_TOS; /* Service = 0, is not implemented */
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iphdr->len = htons ( pkb_len ( pkb ) ); /* Total packet length, in network byte order */
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iphdr->ident = next_ident++; /* Identification number */
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iphdr->frags = 0; /* Fragmentation is not implemented at the host */
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iphdr->ttl = IP_TTL; /* Time to live */
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iphdr->protocol = trans_proto; /* Transport-layer protocol - IP_XXX */
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/* Calculate header checksum, in network byte order */
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iphdr->chksum = 0;
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iphdr->chksum = htons ( calc_chksum ( iphdr, IP_HLEN ) );
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/* Copy destination address */
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memcpy ( &iphdr->dest, dest, sizeof ( struct in_addr ) );
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/**
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* All fields in the IP header filled in except the source network address (which requires routing). As
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* the pseudo header requires the source address as well and updating the transport-layer checksum is
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* done after routing.
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*
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* Continue processing as in ipv4_uip_tx()
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*/
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/* Use routing table to identify next hop and transmitting netdev */
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next_hop = iphdr->dest;
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list_for_each_entry ( miniroute, &miniroutes, list ) {
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if ( ( ( ( iphdr->dest.s_addr ^ miniroute->address.s_addr ) &
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miniroute->netmask.s_addr ) == 0 ) ||
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( miniroute->gateway.s_addr != INADDR_NONE ) ) {
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netdev = miniroute->netdev;
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source = miniroute->address;
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if ( miniroute->gateway.s_addr != INADDR_NONE )
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next_hop = miniroute->gateway;
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break;
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}
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}
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/* Abort if no network device identified */
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if ( ! netdev ) {
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DBG ( "No route to %s\n", inet_ntoa ( iphdr->dest ) );
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rc = -EHOSTUNREACH;
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goto err;
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}
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/* Copy the source address, after this the IP header is complete */
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memcpy ( &iphdr->src, &source, sizeof ( struct in_addr ) );
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/* Calculate the transport layer checksum */
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ipv4_tx_csum ( pkb, trans_proto );
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/* Print IP4 header for debugging */
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DBG ( "IP4 header at %#x + %d\n", iphdr, IP_HLEN );
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DBG ( "\tVersion = %d\n", ( iphdr->verhdrlen & IP_MASK_VER ) / 16 );
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DBG ( "\tHeader length = %d\n", iphdr->verhdrlen & IP_MASK_HLEN );
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DBG ( "\tService = %d\n", iphdr->service );
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DBG ( "\tTotal length = %d\n", iphdr->len );
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DBG ( "\tIdent = %d\n", iphdr->ident );
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DBG ( "\tFrags/Offset = %d\n", iphdr->frags );
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DBG ( "\tIP TTL = %d\n", iphdr->ttl );
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DBG ( "\tProtocol = %d\n", iphdr->protocol );
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DBG ( "\tHeader Checksum (at %#x) = %x\n", &iphdr->chksum, iphdr->chksum );
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DBG ( "\tSource = %s\n", inet_ntoa ( iphdr->src) );
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DBG ( "\tDestination = %s\n", inet_ntoa ( iphdr->dest ) );
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/* Determine link-layer destination address */
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if ( next_hop.s_addr == INADDR_BROADCAST ) {
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/* Broadcast address */
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ll_dest = netdev->ll_protocol->ll_broadcast;
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} else if ( IN_MULTICAST ( next_hop.s_addr ) ) {
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/* Special case: IPv4 multicast over Ethernet. This
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* code may need to be generalised once we find out
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* what happens for other link layers.
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*/
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uint8_t *next_hop_bytes = ( uint8_t * ) &next_hop;
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ll_dest_buf[0] = 0x01;
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ll_dest_buf[0] = 0x00;
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ll_dest_buf[0] = 0x5e;
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ll_dest_buf[3] = next_hop_bytes[1] & 0x7f;
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ll_dest_buf[4] = next_hop_bytes[2];
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ll_dest_buf[5] = next_hop_bytes[3];
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} else {
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/* Unicast address: resolve via ARP */
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if ( ( rc = arp_resolve ( netdev, &ipv4_protocol, &next_hop, &source, ll_dest_buf ) ) != 0 ) {
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DBG ( "No ARP entry for %s\n", inet_ntoa ( iphdr->dest ) );
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goto err;
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}
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}
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/* Hand off to link layer */
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return net_tx ( pkb, netdev, &ipv4_protocol, ll_dest );
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err:
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/* Warning: Allowing this function to execute causes bochs to go into an infinite loop */
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free_pkb ( pkb );
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return rc;
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}
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/**
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* Transmit IP6 packets
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*
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* Placeholder to allow linking. The function should be placed in net/ipv6.c
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*/
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int ipv6_tx ( struct pk_buff *pkb __unused, uint16_t trans_proto __unused, struct in6_addr *dest __unused) {
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return -ENOSYS;
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}
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/**
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* Process incoming IP packets
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*
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@ -200,6 +363,74 @@ static int ipv4_uip_rx ( struct pk_buff *pkb,
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return 0;
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}
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/**
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* Process incoming IP6 packets
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*
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* Placeholder function. Should rewrite in net/ipv6.c
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*/
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void ipv6_rx ( struct pk_buff *pkb __unused, struct net_device *netdev __unused, const void *ll_source __unused ) {
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}
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/**
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* Process incoming packets (without uIP)
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*
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* @v pkb Packet buffer
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* @v netdev Network device
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* @v ll_source Link-layer destination source
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*
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* This function expects an IP4 network datagram. It will process the headers and send it to the transport layer
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*/
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void ipv4_rx ( struct pk_buff *pkb, struct net_device *netdev __unused,
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const void *ll_source __unused ) {
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struct iphdr *iphdr = pkb->data;
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struct in_addr *src = &iphdr->src;
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struct in_addr *dest = &iphdr->dest;
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uint16_t chksum;
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/* Print IP4 header for debugging */
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DBG ( "IP4 header at %#x + %d\n", iphdr, IP_HLEN );
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DBG ( "\tVersion = %d\n", ( iphdr->verhdrlen & IP_MASK_VER ) / 16 );
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DBG ( "\tHeader length = %d\n", iphdr->verhdrlen & IP_MASK_HLEN );
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DBG ( "\tService = %d\n", iphdr->service );
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DBG ( "\tTotal length = %d\n", iphdr->len );
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DBG ( "\tIdent = %d\n", iphdr->ident );
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DBG ( "\tFrags/Offset = %d\n", iphdr->frags );
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DBG ( "\tIP TTL = %d\n", iphdr->ttl );
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DBG ( "\tProtocol = %d\n", iphdr->protocol );
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DBG ( "\tHeader Checksum (at %#x) = %x\n", &iphdr->chksum, iphdr->chksum );
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DBG ( "\tSource = %s\n", inet_ntoa ( iphdr->src) );
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DBG ( "\tDestination = %s\n", inet_ntoa ( iphdr->dest ) );
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/* Process headers */
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if ( iphdr->verhdrlen != 0x45 ) {
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DBG ( "Bad version and header length %x\n", iphdr->verhdrlen );
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return;
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}
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if ( iphdr->len != pkb_len ( pkb ) ) {
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DBG ( "Bad total length %d\n", iphdr->len );
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return;
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}
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if ( ( chksum = ipv4_rx_csum ( pkb, iphdr->protocol ) ) != 0xffff ) {
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DBG ( "Bad checksum %x\n", chksum );
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}
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/* Todo: Compute and verify the header checksum */
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/* To reduce code size, the following functions are not implemented:
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* 1. Check the destination address
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* 2. Check the TTL field
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* 3. Check the service field
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*/
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/* Strip header */
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pkb_pull ( pkb, IP_HLEN );
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/* Send it to the transport layer */
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trans_rx ( pkb, iphdr->protocol, src, dest );
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}
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/**
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* Check existence of IPv4 address for ARP
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*
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