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#include <errno.h>
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <byteswap.h>
#include <ipxe/in.h>
#include <ipxe/ip6.h>
#include <ipxe/ndp.h>
#include <ipxe/list.h>
#include <ipxe/icmp6.h>
#include <ipxe/tcpip.h>
#include <ipxe/socket.h>
#include <ipxe/iobuf.h>
#include <ipxe/netdevice.h>
#include <ipxe/if_ether.h>
/* Unspecified IP6 address */
static struct in6_addr ip6_none = {
.in6_u.u6_addr32 = { 0,0,0,0 }
};
/** An IPv6 routing table entry */
struct ipv6_miniroute {
/* List of miniroutes */
struct list_head list;
/* Network device */
struct net_device *netdev;
/* Destination prefix */
struct in6_addr prefix;
/* Prefix length */
int prefix_len;
/* IPv6 address of interface */
struct in6_addr address;
/* Gateway address */
struct in6_addr gateway;
};
/** List of IPv6 miniroutes */
static LIST_HEAD ( miniroutes );
/**
* Add IPv6 minirouting table entry
*
* @v netdev Network device
* @v prefix Destination prefix
* @v address Address of the interface
* @v gateway Gateway address (or ::0 for no gateway)
* @ret miniroute Routing table entry, or NULL
*/
static struct ipv6_miniroute * __malloc
add_ipv6_miniroute ( struct net_device *netdev, struct in6_addr prefix,
int prefix_len, struct in6_addr address,
struct in6_addr gateway ) {
struct ipv6_miniroute *miniroute;
miniroute = malloc ( sizeof ( *miniroute ) );
if ( miniroute ) {
/* Record routing information */
miniroute->netdev = netdev_get ( netdev );
miniroute->prefix = prefix;
miniroute->prefix_len = prefix_len;
miniroute->address = address;
miniroute->gateway = gateway;
/* Add miniroute to list of miniroutes */
if ( !IP6_EQUAL ( gateway, ip6_none ) ) {
list_add_tail ( &miniroute->list, &miniroutes );
} else {
list_add ( &miniroute->list, &miniroutes );
}
}
return miniroute;
}
/**
* Delete IPv6 minirouting table entry
*
* @v miniroute Routing table entry
*/
static void del_ipv6_miniroute ( struct ipv6_miniroute *miniroute ) {
netdev_put ( miniroute->netdev );
list_del ( &miniroute->list );
free ( miniroute );
}
/**
* Add IPv6 interface
*
* @v netdev Network device
* @v prefix Destination prefix
* @v address Address of the interface
* @v gateway Gateway address (or ::0 for no gateway)
*/
int add_ipv6_address ( struct net_device *netdev, struct in6_addr prefix,
int prefix_len, struct in6_addr address,
struct in6_addr gateway ) {
struct ipv6_miniroute *miniroute;
/* Clear any existing address for this net device */
del_ipv6_address ( netdev );
/* Add new miniroute */
miniroute = add_ipv6_miniroute ( netdev, prefix, prefix_len, address,
gateway );
if ( ! miniroute )
return -ENOMEM;
return 0;
}
/**
* Remove IPv6 interface
*
* @v netdev Network device
*/
void del_ipv6_address ( struct net_device *netdev ) {
struct ipv6_miniroute *miniroute;
list_for_each_entry ( miniroute, &miniroutes, list ) {
if ( miniroute->netdev == netdev ) {
del_ipv6_miniroute ( miniroute );
break;
}
}
}
/**
* Calculate TCPIP checksum
*
* @v iobuf I/O buffer
* @v tcpip TCP/IP protocol
*
* This function constructs the pseudo header and completes the checksum in the
* upper layer header.
*/
static uint16_t ipv6_tx_csum ( struct io_buffer *iobuf, uint16_t csum ) {
struct ip6_header *ip6hdr = iobuf->data;
struct ipv6_pseudo_header pshdr;
/* Calculate pseudo header */
memset ( &pshdr, 0, sizeof ( pshdr ) );
pshdr.src = ip6hdr->src;
pshdr.dest = ip6hdr->dest;
pshdr.len = htons ( iob_len ( iobuf ) - sizeof ( *ip6hdr ) );
pshdr.nxt_hdr = ip6hdr->nxt_hdr;
/* Update checksum value */
return tcpip_continue_chksum ( csum, &pshdr, sizeof ( pshdr ) );
}
/**
* Dump IP6 header for debugging
*
* ip6hdr IPv6 header
*/
void ipv6_dump ( struct ip6_header *ip6hdr ) {
DBG ( "IP6 %p src %s dest %s nxt_hdr %d len %d\n", ip6hdr,
inet6_ntoa ( ip6hdr->src ), inet6_ntoa ( ip6hdr->dest ),
ip6hdr->nxt_hdr, ntohs ( ip6hdr->payload_len ) );
}
/**
* Transmit IP6 packet
*
* iobuf I/O buffer
* tcpip TCP/IP protocol
* st_dest Destination socket address
*
* This function prepends the IPv6 headers to the payload an transmits it.
*/
static int ipv6_tx ( struct io_buffer *iobuf,
struct tcpip_protocol *tcpip,
struct sockaddr_tcpip *st_src __unused,
struct sockaddr_tcpip *st_dest,
struct net_device *netdev,
uint16_t *trans_csum ) {
struct sockaddr_in6 *dest = ( struct sockaddr_in6* ) st_dest;
struct in6_addr next_hop;
struct ipv6_miniroute *miniroute;
uint8_t ll_dest_buf[MAX_LL_ADDR_LEN];
const uint8_t *ll_dest = ll_dest_buf;
int rc;
/* Construct the IPv6 packet */
struct ip6_header *ip6hdr = iob_push ( iobuf, sizeof ( *ip6hdr ) );
memset ( ip6hdr, 0, sizeof ( *ip6hdr) );
ip6hdr->ver_traffic_class_flow_label = htonl ( 0x60000000 );//IP6_VERSION;
ip6hdr->payload_len = htons ( iob_len ( iobuf ) - sizeof ( *ip6hdr ) );
ip6hdr->nxt_hdr = tcpip->tcpip_proto;
ip6hdr->hop_limit = IP6_HOP_LIMIT; // 255
/* Determine the next hop address and interface
*
* TODO: Implement the routing table.
*/
next_hop = dest->sin6_addr;
list_for_each_entry ( miniroute, &miniroutes, list ) {
if ( ( memcmp ( &ip6hdr->dest, &miniroute->prefix,
miniroute->prefix_len ) == 0 ) ||
( IP6_EQUAL ( miniroute->gateway, ip6_none ) ) ) {
netdev = miniroute->netdev;
ip6hdr->src = miniroute->address;
if ( ! ( IS_UNSPECIFIED ( miniroute->gateway ) ) ) {
next_hop = miniroute->gateway;
}
break;
}
}
/* No network interface identified */
if ( !netdev ) {
DBG ( "No route to host %s\n", inet6_ntoa ( ip6hdr->dest ) );
rc = -ENETUNREACH;
goto err;
}
/* Complete the transport layer checksum */
if ( trans_csum )
*trans_csum = ipv6_tx_csum ( iobuf, *trans_csum );
/* Print IPv6 header */
ipv6_dump ( ip6hdr );
/* Resolve link layer address */
if ( next_hop.in6_u.u6_addr8[0] == 0xff ) {
ll_dest_buf[0] = 0x33;
ll_dest_buf[1] = 0x33;
ll_dest_buf[2] = next_hop.in6_u.u6_addr8[12];
ll_dest_buf[3] = next_hop.in6_u.u6_addr8[13];
ll_dest_buf[4] = next_hop.in6_u.u6_addr8[14];
ll_dest_buf[5] = next_hop.in6_u.u6_addr8[15];
} else {
/* Unicast address needs to be resolved by NDP */
if ( ( rc = ndp_resolve ( netdev, &next_hop, &ip6hdr->src,
ll_dest_buf ) ) != 0 ) {
DBG ( "No entry for %s\n", inet6_ntoa ( next_hop ) );
goto err;
}
}
/* Transmit packet */
return net_tx ( iobuf, netdev, &ipv6_protocol, ll_dest,
netdev->ll_addr );
err:
free_iob ( iobuf );
return rc;
}
/**
* Process next IP6 header
*
* @v iobuf I/O buffer
* @v nxt_hdr Next header number
* @v src Source socket address
* @v dest Destination socket address
*
* Refer http://www.iana.org/assignments/ipv6-parameters for the numbers
*/
static int ipv6_process_nxt_hdr ( struct io_buffer *iobuf,
struct net_device *netdev, uint8_t nxt_hdr,
struct sockaddr_tcpip *src, struct sockaddr_tcpip *dest ) {
switch ( nxt_hdr ) {
case IP6_HOPBYHOP:
case IP6_ROUTING:
case IP6_FRAGMENT:
case IP6_AUTHENTICATION:
case IP6_DEST_OPTS:
case IP6_ESP:
DBG ( "Function not implemented for header %d\n", nxt_hdr );
return -ENOSYS;
case IP6_ICMP6:
break;
case IP6_NO_HEADER:
DBG ( "No next header\n" );
return 0;
}
/* Next header is not a IPv6 extension header */
return tcpip_rx ( iobuf, netdev, nxt_hdr, src, dest, 0 /* fixme */ );
}
/**
* Process incoming IP6 packets
*
* @v iobuf I/O buffer
* @v netdev Network device
* @v ll_dest Link-layer destination address
* @v ll_source Link-layer source address
* @v flags Packet flags
*
* This function processes a IPv6 packet
*/
static int ipv6_rx ( struct io_buffer *iobuf,
__unused struct net_device *netdev,
__unused const void *ll_dest,
__unused const void *ll_source,
__unused unsigned int flags ) {
struct ip6_header *ip6hdr = iobuf->data;
union {
struct sockaddr_in6 sin6;
struct sockaddr_tcpip st;
} src, dest;
/* Sanity check */
if ( iob_len ( iobuf ) < sizeof ( *ip6hdr ) ) {
DBG ( "Packet too short (%zd bytes)\n", iob_len ( iobuf ) );
goto drop;
}
/* TODO: Verify checksum */
/* Print IP6 header for debugging */
ipv6_dump ( ip6hdr );
/* Check header version */
if ( ( ip6hdr->ver_traffic_class_flow_label & 0xf0000000 ) != 0x60000000 ) {
DBG ( "Invalid protocol version\n" );
goto drop;
}
/* Check the payload length */
if ( ntohs ( ip6hdr->payload_len ) > iob_len ( iobuf ) ) {
DBG ( "Inconsistent packet length (%d bytes)\n",
ip6hdr->payload_len );
goto drop;
}
/* Ignore the traffic class and flow control values */
/* Construct socket address */
memset ( &src, 0, sizeof ( src ) );
src.sin6.sin6_family = AF_INET6;
src.sin6.sin6_addr = ip6hdr->src;
memset ( &dest, 0, sizeof ( dest ) );
dest.sin6.sin6_family = AF_INET6;
dest.sin6.sin6_addr = ip6hdr->dest;
/* Strip header */
iob_unput ( iobuf, iob_len ( iobuf ) - ntohs ( ip6hdr->payload_len ) -
sizeof ( *ip6hdr ) );
iob_pull ( iobuf, sizeof ( *ip6hdr ) );
/* Send it to the transport layer */
return ipv6_process_nxt_hdr ( iobuf, netdev, ip6hdr->nxt_hdr, &src.st, &dest.st );
drop:
DBG ( "Packet dropped\n" );
free_iob ( iobuf );
return -1;
}
/**
* Print a IP6 address as xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx
*/
char * inet6_ntoa ( struct in6_addr in6 ) {
static char buf[40];
uint16_t *bytes = ( uint16_t* ) &in6;
sprintf ( buf, "%x:%x:%x:%x:%x:%x:%x:%x", bytes[0], bytes[1], bytes[2],
bytes[3], bytes[4], bytes[5], bytes[6], bytes[7] );
return buf;
}
static const char * ipv6_ntoa ( const void *net_addr ) {
return inet6_ntoa ( * ( ( struct in6_addr * ) net_addr ) );
}
/** IPv6 protocol */
struct net_protocol ipv6_protocol __net_protocol = {
.name = "IPv6",
.net_proto = htons ( ETH_P_IPV6 ),
.net_addr_len = sizeof ( struct in6_addr ),
.rx = ipv6_rx,
.ntoa = ipv6_ntoa,
};
/** IPv6 TCPIP net protocol */
struct tcpip_net_protocol ipv6_tcpip_protocol __tcpip_net_protocol = {
.name = "IPv6",
.sa_family = AF_INET6,
.tx = ipv6_tx,
};
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