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|
/*
* Copyright (C) 2013 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include <byteswap.h>
#include <ipxe/iobuf.h>
#include <ipxe/tcpip.h>
#include <ipxe/if_ether.h>
#include <ipxe/crc32.h>
#include <ipxe/fragment.h>
#include <ipxe/ndp.h>
#include <ipxe/ipv6.h>
/** @file
*
* IPv6 protocol
*
*/
/* Disambiguate the various error causes */
#define EINVAL_LEN __einfo_error ( EINFO_EINVAL_LEN )
#define EINFO_EINVAL_LEN \
__einfo_uniqify ( EINFO_EINVAL, 0x01, "Invalid length" )
#define ENOTSUP_VER __einfo_error ( EINFO_ENOTSUP_VER )
#define EINFO_ENOTSUP_VER \
__einfo_uniqify ( EINFO_ENOTSUP, 0x01, "Unsupported version" )
#define ENOTSUP_HDR __einfo_error ( EINFO_ENOTSUP_HDR )
#define EINFO_ENOTSUP_HDR \
__einfo_uniqify ( EINFO_ENOTSUP, 0x02, "Unsupported header type" )
#define ENOTSUP_OPT __einfo_error ( EINFO_ENOTSUP_OPT )
#define EINFO_ENOTSUP_OPT \
__einfo_uniqify ( EINFO_ENOTSUP, 0x03, "Unsupported option" )
/** List of IPv6 miniroutes */
struct list_head ipv6_miniroutes = LIST_HEAD_INIT ( ipv6_miniroutes );
/**
* Determine debugging colour for IPv6 debug messages
*
* @v in IPv6 address
* @ret col Debugging colour (for DBGC())
*/
static uint32_t ipv6col ( struct in6_addr *in ) {
return crc32_le ( 0, in, sizeof ( *in ) );
}
/**
* Check if network device has a specific IPv6 address
*
* @v netdev Network device
* @v addr IPv6 address
* @ret has_addr Network device has this IPv6 address
*/
int ipv6_has_addr ( struct net_device *netdev, struct in6_addr *addr ) {
struct ipv6_miniroute *miniroute;
list_for_each_entry ( miniroute, &ipv6_miniroutes, list ) {
if ( ( miniroute->netdev == netdev ) &&
( memcmp ( &miniroute->address, addr,
sizeof ( miniroute->address ) ) == 0 ) ) {
/* Found matching address */
return 1;
}
}
return 0;
}
/**
* Check if IPv6 address is within a routing table entry's local network
*
* @v miniroute Routing table entry
* @v address IPv6 address
* @ret is_local Address is within this entry's local network
*/
static int ipv6_is_local ( struct ipv6_miniroute *miniroute,
struct in6_addr *address ) {
unsigned int i;
for ( i = 0 ; i < ( sizeof ( address->s6_addr32 ) /
sizeof ( address->s6_addr32[0] ) ) ; i++ ) {
if ( (( address->s6_addr32[i] ^ miniroute->address.s6_addr32[i])
& miniroute->prefix_mask.s6_addr32[i] ) != 0 )
return 0;
}
return 1;
}
/**
* Add IPv6 minirouting table entry
*
* @v netdev Network device
* @v address IPv6 address
* @v prefix_len Prefix length
* @v router Router address (or NULL)
* @ret miniroute Routing table entry, or NULL on failure
*/
static struct ipv6_miniroute * __malloc
add_ipv6_miniroute ( struct net_device *netdev, struct in6_addr *address,
unsigned int prefix_len, struct in6_addr *router ) {
struct ipv6_miniroute *miniroute;
uint8_t *prefix_mask;
DBGC ( netdev, "IPv6 add %s/%d ", inet6_ntoa ( address ), prefix_len );
if ( router )
DBGC ( netdev, "router %s ", inet6_ntoa ( router ) );
DBGC ( netdev, "via %s\n", netdev->name );
/* Allocate and populate miniroute structure */
miniroute = zalloc ( sizeof ( *miniroute ) );
if ( ! miniroute )
return NULL;
/* Record routing information */
miniroute->netdev = netdev_get ( netdev );
memcpy ( &miniroute->address, address, sizeof ( miniroute->address ) );
miniroute->prefix_len = prefix_len;
assert ( prefix_len <= ( 8 * sizeof ( miniroute->prefix_mask ) ) );
for ( prefix_mask = miniroute->prefix_mask.s6_addr ; prefix_len >= 8 ;
prefix_mask++, prefix_len -= 8 ) {
*prefix_mask = 0xff;
}
if ( prefix_len )
*prefix_mask <<= ( 8 - prefix_len );
if ( router ) {
miniroute->has_router = 1;
memcpy ( &miniroute->router, router,
sizeof ( miniroute->router ) );
}
/* Add to end of list if we have a gateway, otherwise to start
* of list.
*/
if ( router ) {
list_add_tail ( &miniroute->list, &ipv6_miniroutes );
} else {
list_add ( &miniroute->list, &ipv6_miniroutes );
}
return miniroute;
}
/**
* Delete IPv6 minirouting table entry
*
* @v miniroute Routing table entry
*/
static void del_ipv6_miniroute ( struct ipv6_miniroute *miniroute ) {
struct net_device *netdev = miniroute->netdev;
DBGC ( netdev, "IPv6 del %s/%d ", inet6_ntoa ( &miniroute->address ),
miniroute->prefix_len );
if ( miniroute->has_router )
DBGC ( netdev, "router %s ", inet6_ntoa ( &miniroute->router ));
DBGC ( netdev, "via %s\n", netdev->name );
netdev_put ( miniroute->netdev );
list_del ( &miniroute->list );
free ( miniroute );
}
/**
* Perform IPv6 routing
*
* @v scope_id Destination address scope ID (for link-local addresses)
* @v dest Final destination address
* @ret dest Next hop destination address
* @ret miniroute Routing table entry to use, or NULL if no route
*/
static struct ipv6_miniroute * ipv6_route ( unsigned int scope_id,
struct in6_addr **dest ) {
struct ipv6_miniroute *miniroute;
int local;
/* Find first usable route in routing table */
list_for_each_entry ( miniroute, &ipv6_miniroutes, list ) {
/* Skip closed network devices */
if ( ! netdev_is_open ( miniroute->netdev ) )
continue;
/* For link-local addresses, skip devices that are not
* the specified network device.
*/
if ( IN6_IS_ADDR_LINKLOCAL ( *dest ) &&
( miniroute->netdev->index != scope_id ) )
continue;
/* Skip non-gateway devices for which the prefix does
* not match.
*/
local = ipv6_is_local ( miniroute, *dest );
if ( ! ( local || miniroute->has_router ) )
continue;
/* Update next hop if applicable */
if ( ! local )
*dest = &miniroute->router;
return miniroute;
}
return NULL;
}
/**
* Check that received options can be safely ignored
*
* @v iphdr IPv6 header
* @v options Options extension header
* @v len Maximum length of header
* @ret rc Return status code
*/
static int ipv6_check_options ( struct ipv6_header *iphdr,
struct ipv6_options_header *options,
size_t len ) {
struct ipv6_option *option = options->options;
struct ipv6_option *end = ( ( ( void * ) options ) + len );
while ( option < end ) {
if ( ! IPV6_CAN_IGNORE_OPT ( option->type ) ) {
DBGC ( ipv6col ( &iphdr->src ), "IPv6 unrecognised "
"option type %#02x:\n", option->type );
DBGC_HDA ( ipv6col ( &iphdr->src ), 0,
options, len );
return -ENOTSUP_OPT;
}
if ( option->type == IPV6_OPT_PAD1 ) {
option = ( ( ( void * ) option ) + 1 );
} else {
option = ( ( ( void * ) option ) + option->len );
}
}
return 0;
}
/**
* Check if fragment matches fragment reassembly buffer
*
* @v fragment Fragment reassembly buffer
* @v iobuf I/O buffer
* @v hdrlen Length of non-fragmentable potion of I/O buffer
* @ret is_fragment Fragment matches this reassembly buffer
*/
static int ipv6_is_fragment ( struct fragment *fragment,
struct io_buffer *iobuf, size_t hdrlen ) {
struct ipv6_header *frag_iphdr = fragment->iobuf->data;
struct ipv6_fragment_header *frag_fhdr =
( fragment->iobuf->data + fragment->hdrlen -
sizeof ( *frag_fhdr ) );
struct ipv6_header *iphdr = iobuf->data;
struct ipv6_fragment_header *fhdr =
( iobuf->data + hdrlen - sizeof ( *fhdr ) );
return ( ( memcmp ( &iphdr->src, &frag_iphdr->src,
sizeof ( iphdr->src ) ) == 0 ) &&
( fhdr->ident == frag_fhdr->ident ) );
}
/**
* Get fragment offset
*
* @v iobuf I/O buffer
* @v hdrlen Length of non-fragmentable potion of I/O buffer
* @ret offset Offset
*/
static size_t ipv6_fragment_offset ( struct io_buffer *iobuf, size_t hdrlen ) {
struct ipv6_fragment_header *fhdr =
( iobuf->data + hdrlen - sizeof ( *fhdr ) );
return ( ntohs ( fhdr->offset_more ) & IPV6_MASK_OFFSET );
}
/**
* Check if more fragments exist
*
* @v iobuf I/O buffer
* @v hdrlen Length of non-fragmentable potion of I/O buffer
* @ret more_frags More fragments exist
*/
static int ipv6_more_fragments ( struct io_buffer *iobuf, size_t hdrlen ) {
struct ipv6_fragment_header *fhdr =
( iobuf->data + hdrlen - sizeof ( *fhdr ) );
return ( fhdr->offset_more & htons ( IPV6_MASK_MOREFRAGS ) );
}
/** Fragment reassembler */
static struct fragment_reassembler ipv6_reassembler = {
.list = LIST_HEAD_INIT ( ipv6_reassembler.list ),
.is_fragment = ipv6_is_fragment,
.fragment_offset = ipv6_fragment_offset,
.more_fragments = ipv6_more_fragments,
};
/**
* Calculate IPv6 pseudo-header checksum
*
* @v iphdr IPv6 header
* @v len Payload length
* @v next_header Next header type
* @v csum Existing checksum
* @ret csum Updated checksum
*/
static uint16_t ipv6_pshdr_chksum ( struct ipv6_header *iphdr, size_t len,
int next_header, uint16_t csum ) {
struct ipv6_pseudo_header pshdr;
/* Build pseudo-header */
memcpy ( &pshdr.src, &iphdr->src, sizeof ( pshdr.src ) );
memcpy ( &pshdr.dest, &iphdr->dest, sizeof ( pshdr.dest ) );
pshdr.len = htonl ( len );
memset ( pshdr.zero, 0, sizeof ( pshdr.zero ) );
pshdr.next_header = next_header;
/* Update the checksum value */
return tcpip_continue_chksum ( csum, &pshdr, sizeof ( pshdr ) );
}
/**
* Transmit IPv6 packet
*
* @v iobuf I/O buffer
* @v tcpip Transport-layer protocol
* @v st_src Source network-layer address
* @v st_dest Destination network-layer address
* @v netdev Network device to use if no route found, or NULL
* @v trans_csum Transport-layer checksum to complete, or NULL
* @ret rc Status
*
* This function expects a transport-layer segment and prepends the
* IPv6 header
*/
static int ipv6_tx ( struct io_buffer *iobuf,
struct tcpip_protocol *tcpip_protocol,
struct sockaddr_tcpip *st_src,
struct sockaddr_tcpip *st_dest,
struct net_device *netdev,
uint16_t *trans_csum ) {
struct sockaddr_in6 *sin6_src = ( ( struct sockaddr_in6 * ) st_src );
struct sockaddr_in6 *sin6_dest = ( ( struct sockaddr_in6 * ) st_dest );
struct ipv6_miniroute *miniroute;
struct ipv6_header *iphdr;
struct in6_addr *next_hop;
uint8_t ll_dest_buf[MAX_LL_ADDR_LEN];
const void *ll_dest;
size_t len;
int rc;
/* Fill up the IPv6 header, except source address */
len = iob_len ( iobuf );
iphdr = iob_push ( iobuf, sizeof ( *iphdr ) );
memset ( iphdr, 0, sizeof ( *iphdr ) );
iphdr->ver_tc_label = htonl ( IPV6_VER );
iphdr->len = htons ( len );
iphdr->next_header = tcpip_protocol->tcpip_proto;
iphdr->hop_limit = IPV6_HOP_LIMIT;
memcpy ( &iphdr->dest, &sin6_dest->sin6_addr, sizeof ( iphdr->dest ) );
/* Use routing table to identify next hop and transmitting netdev */
next_hop = &iphdr->dest;
if ( sin6_src ) {
memcpy ( &iphdr->src, &sin6_src->sin6_addr,
sizeof ( iphdr->src ) );
}
if ( ( ! IN6_IS_ADDR_MULTICAST ( next_hop ) ) &&
( ( miniroute = ipv6_route ( ntohl ( sin6_dest->sin6_scope_id ),
&next_hop ) ) != NULL ) ) {
memcpy ( &iphdr->src, &miniroute->address,
sizeof ( iphdr->src ) );
netdev = miniroute->netdev;
}
if ( ! netdev ) {
DBGC ( ipv6col ( &iphdr->dest ), "IPv6 has no route to %s\n",
inet6_ntoa ( &iphdr->dest ) );
rc = -ENETUNREACH;
goto err;
}
/* Fix up checksums */
if ( trans_csum ) {
*trans_csum = ipv6_pshdr_chksum ( iphdr, len,
tcpip_protocol->tcpip_proto,
*trans_csum );
}
/* Print IPv6 header for debugging */
DBGC2 ( ipv6col ( &iphdr->dest ), "IPv6 TX %s->",
inet6_ntoa ( &iphdr->src ) );
DBGC2 ( ipv6col ( &iphdr->dest ), "%s len %zd next %d\n",
inet6_ntoa ( &iphdr->dest ), len, iphdr->next_header );
/* Calculate link-layer destination address, if possible */
if ( IN6_IS_ADDR_MULTICAST ( next_hop ) ) {
/* Multicast address */
if ( ( rc = netdev->ll_protocol->mc_hash ( AF_INET6, next_hop,
ll_dest_buf ) ) !=0){
DBGC ( ipv6col ( &iphdr->dest ), "IPv6 could not hash "
"multicast %s: %s\n", inet6_ntoa ( next_hop ),
strerror ( rc ) );
goto err;
}
ll_dest = ll_dest_buf;
} else {
/* Unicast address */
ll_dest = NULL;
}
/* Hand off to link layer (via NDP if applicable) */
if ( ll_dest ) {
if ( ( rc = net_tx ( iobuf, netdev, &ipv6_protocol, ll_dest,
netdev->ll_addr ) ) != 0 ) {
DBGC ( ipv6col ( &iphdr->dest ), "IPv6 could not "
"transmit packet via %s: %s\n",
netdev->name, strerror ( rc ) );
return rc;
}
} else {
if ( ( rc = ndp_tx ( iobuf, netdev, next_hop, &iphdr->src,
netdev->ll_addr ) ) != 0 ) {
DBGC ( ipv6col ( &iphdr->dest ), "IPv6 could not "
"transmit packet via %s: %s\n",
netdev->name, strerror ( rc ) );
return rc;
}
}
return 0;
err:
free_iob ( iobuf );
return rc;
}
/**
* Process incoming IPv6 packets
*
* @v iobuf I/O buffer
* @v netdev Network device
* @v ll_dest Link-layer destination address
* @v ll_source Link-layer destination source
* @v flags Packet flags
* @ret rc Return status code
*
* This function expects an IPv6 network datagram. It processes the
* headers and sends it to the transport layer.
*/
static int ipv6_rx ( struct io_buffer *iobuf, struct net_device *netdev,
const void *ll_dest __unused,
const void *ll_source __unused,
unsigned int flags __unused ) {
struct ipv6_header *iphdr = iobuf->data;
union ipv6_extension_header *ext;
union {
struct sockaddr_in6 sin6;
struct sockaddr_tcpip st;
} src, dest;
uint16_t pshdr_csum;
size_t len;
size_t hdrlen;
size_t extlen;
int this_header;
int next_header;
int rc;
/* Sanity check the IPv6 header */
if ( iob_len ( iobuf ) < sizeof ( *iphdr ) ) {
DBGC ( ipv6col ( &iphdr->src ), "IPv6 packet too short at %zd "
"bytes (min %zd bytes)\n", iob_len ( iobuf ),
sizeof ( *iphdr ) );
rc = -EINVAL_LEN;
goto err;
}
if ( ( iphdr->ver_tc_label & htonl ( IPV6_MASK_VER ) ) !=
htonl ( IPV6_VER ) ) {
DBGC ( ipv6col ( &iphdr->src ), "IPv6 version %#08x not "
"supported\n", ntohl ( iphdr->ver_tc_label ) );
rc = -ENOTSUP_VER;
goto err;
}
/* Truncate packet to specified length */
len = ntohs ( iphdr->len );
if ( len > iob_len ( iobuf ) ) {
DBGC ( ipv6col ( &iphdr->src ), "IPv6 length too long at %zd "
"bytes (packet is %zd bytes)\n", len, iob_len ( iobuf ));
rc = -EINVAL_LEN;
goto err;
}
iob_unput ( iobuf, ( iob_len ( iobuf ) - len - sizeof ( *iphdr ) ) );
hdrlen = sizeof ( *iphdr );
/* Print IPv6 header for debugging */
DBGC2 ( ipv6col ( &iphdr->src ), "IPv6 RX %s<-",
inet6_ntoa ( &iphdr->dest ) );
DBGC2 ( ipv6col ( &iphdr->src ), "%s len %zd next %d\n",
inet6_ntoa ( &iphdr->src ), len, iphdr->next_header );
/* Discard unicast packets not destined for us */
if ( ( ! ( flags & LL_MULTICAST ) ) &&
( ! ipv6_has_addr ( netdev, &iphdr->dest ) ) ) {
DBGC ( ipv6col ( &iphdr->src ), "IPv6 discarding non-local "
"unicast packet for %s\n", inet6_ntoa ( &iphdr->dest ) );
rc = -EPIPE;
goto err;
}
/* Process any extension headers */
next_header = iphdr->next_header;
while ( 1 ) {
/* Extract extension header */
this_header = next_header;
ext = ( iobuf->data + hdrlen );
extlen = sizeof ( ext->pad );
if ( iob_len ( iobuf ) < ( hdrlen + extlen ) ) {
DBGC ( ipv6col ( &iphdr->src ), "IPv6 too short for "
"extension header type %d at %zd bytes (min "
"%zd bytes)\n", this_header,
( iob_len ( iobuf ) - hdrlen ), extlen );
rc = -EINVAL_LEN;
goto err;
}
/* Determine size of extension header (if applicable) */
if ( ( this_header == IPV6_HOPBYHOP ) ||
( this_header == IPV6_DESTINATION ) ||
( this_header == IPV6_ROUTING ) ) {
/* Length field is present */
extlen += ext->common.len;
} else if ( this_header == IPV6_FRAGMENT ) {
/* Length field is reserved and ignored (RFC2460) */
} else {
/* Not an extension header; assume rest is payload */
break;
}
if ( iob_len ( iobuf ) < ( hdrlen + extlen ) ) {
DBGC ( ipv6col ( &iphdr->src ), "IPv6 too short for "
"extension header type %d at %zd bytes (min "
"%zd bytes)\n", this_header,
( iob_len ( iobuf ) - hdrlen ), extlen );
rc = -EINVAL_LEN;
goto err;
}
hdrlen += extlen;
next_header = ext->common.next_header;
DBGC2 ( ipv6col ( &iphdr->src ), "IPv6 RX %s<-",
inet6_ntoa ( &iphdr->dest ) );
DBGC2 ( ipv6col ( &iphdr->src ), "%s ext type %d len %zd next "
"%d\n", inet6_ntoa ( &iphdr->src ), this_header,
extlen, next_header );
/* Process this extension header */
if ( ( this_header == IPV6_HOPBYHOP ) ||
( this_header == IPV6_DESTINATION ) ) {
/* Check that all options can be ignored */
if ( ( rc = ipv6_check_options ( iphdr, &ext->options,
extlen ) ) != 0 )
goto err;
} else if ( this_header == IPV6_FRAGMENT ) {
/* Reassemble fragments */
iobuf = fragment_reassemble ( &ipv6_reassembler, iobuf,
&hdrlen );
if ( ! iobuf )
return 0;
iphdr = iobuf->data;
}
}
/* Construct socket address, calculate pseudo-header checksum,
* and hand off to transport layer
*/
memset ( &src, 0, sizeof ( src ) );
src.sin6.sin6_family = AF_INET6;
memcpy ( &src.sin6.sin6_addr, &iphdr->src,
sizeof ( src.sin6.sin6_addr ) );
src.sin6.sin6_scope_id = htonl ( netdev->index );
memset ( &dest, 0, sizeof ( dest ) );
dest.sin6.sin6_family = AF_INET6;
memcpy ( &dest.sin6.sin6_addr, &iphdr->dest,
sizeof ( dest.sin6.sin6_addr ) );
dest.sin6.sin6_scope_id = htonl ( netdev->index );
iob_pull ( iobuf, hdrlen );
pshdr_csum = ipv6_pshdr_chksum ( iphdr, iob_len ( iobuf ),
next_header, TCPIP_EMPTY_CSUM );
if ( ( rc = tcpip_rx ( iobuf, netdev, next_header, &src.st, &dest.st,
pshdr_csum ) ) != 0 ) {
DBGC ( ipv6col ( &src.sin6.sin6_addr ), "IPv6 received packet "
"rejected by stack: %s\n", strerror ( rc ) );
return rc;
}
return 0;
err:
free_iob ( iobuf );
return rc;
}
/**
* Convert IPv6 address to standard notation
*
* @v in IPv6 address
* @ret string IPv6 address in standard notation
*
* RFC5952 defines the canonical format for IPv6 textual representation.
*/
char * inet6_ntoa ( const struct in6_addr *in ) {
static char buf[41]; /* ":xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx" */
char *out = buf;
char *longest_start = NULL;
char *start = NULL;
int longest_len = 1;
int len = 0;
char *dest;
unsigned int i;
uint16_t value;
/* Format address, keeping track of longest run of zeros */
for ( i = 0 ; i < ( sizeof ( in->s6_addr16 ) /
sizeof ( in->s6_addr16[0] ) ) ; i++ ) {
value = ntohs ( in->s6_addr16[i] );
if ( value == 0 ) {
if ( len++ == 0 )
start = out;
if ( len > longest_len ) {
longest_start = start;
longest_len = len;
}
} else {
len = 0;
}
out += sprintf ( out, ":%x", value );
}
/* Abbreviate longest run of zeros, if applicable */
if ( longest_start ) {
dest = strcpy ( ( longest_start + 1 ),
( longest_start + ( 2 * longest_len ) ) );
if ( dest[0] == '\0' )
dest[1] = '\0';
dest[0] = ':';
}
return ( ( longest_start == buf ) ? buf : ( buf + 1 ) );
}
/**
* Transcribe IPv6 address
*
* @v net_addr IPv6 address
* @ret string IPv6 address in standard notation
*
*/
static const char * ipv6_ntoa ( const void *net_addr ) {
return inet6_ntoa ( 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,
};
/**
* Create IPv6 network device
*
* @v netdev Network device
* @ret rc Return status code
*/
static int ipv6_probe ( struct net_device *netdev ) {
struct ipv6_miniroute *miniroute;
struct in6_addr address;
int prefix_len;
int rc;
/* Construct link-local address from EUI-64 as per RFC 2464 */
prefix_len = ipv6_link_local ( &address, netdev );
if ( prefix_len < 0 ) {
rc = prefix_len;
DBGC ( netdev, "IPv6 %s could not construct link-local "
"address: %s\n", netdev->name, strerror ( rc ) );
return rc;
}
/* Create link-local address for this network device */
miniroute = add_ipv6_miniroute ( netdev, &address, prefix_len, NULL );
if ( ! miniroute )
return -ENOMEM;
return 0;
}
/**
* Handle IPv6 network device or link state change
*
* @v netdev Network device
*/
static void ipv6_notify ( struct net_device *netdev __unused ) {
/* Nothing to do */
}
/**
* Destroy IPv6 network device
*
* @v netdev Network device
*/
static void ipv6_remove ( struct net_device *netdev ) {
struct ipv6_miniroute *miniroute;
struct ipv6_miniroute *tmp;
/* Delete all miniroutes for this network device */
list_for_each_entry_safe ( miniroute, tmp, &ipv6_miniroutes, list ) {
if ( miniroute->netdev == netdev )
del_ipv6_miniroute ( miniroute );
}
}
/** IPv6 network device driver */
struct net_driver ipv6_driver __net_driver = {
.name = "IPv6",
.probe = ipv6_probe,
.notify = ipv6_notify,
.remove = ipv6_remove,
};
/* Drag in ICMPv6 */
REQUIRE_OBJECT ( icmpv6 );
/* Drag in NDP */
REQUIRE_OBJECT ( ndp );
|