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[ipv6] Separate the concepts of prefix and address creation 

Allow for IPv6 routing table entries to be created for an on-link
prefix where a local address has not yet been assigned to the network
device.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/17/head
Michael Brown 2013-11-15 15:12:25 +00:00
parent 3f9a482b88
commit 6b1eee0452
4 changed files with 206 additions and 129 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
src/include/ipxe/ipv6.h
View File

@ -160,16 +160,24 @@ struct ipv6_miniroute {
/** Network device */
struct net_device *netdev;
/** IPv6 address */
/** IPv6 address (or prefix if no address is defined) */
struct in6_addr address;
/** Prefix length */
unsigned int prefix_len;
/** IPv6 prefix mask (derived from prefix length) */
struct in6_addr prefix_mask;
/** Router address is present */
int has_router;
/** Router address */
struct in6_addr router;
/** Flags */
unsigned int flags;
};
/** IPv6 address/routing table entry flags */
enum ipv6_miniroute_flags {
/** Routing table entry address is valid */
IPV6_HAS_ADDRESS = 0x0001,
/** Routing table entry router address is valid */
IPV6_HAS_ROUTER = 0x0002,
};
/**
@ -235,7 +243,9 @@ extern struct list_head ipv6_miniroutes;
extern struct net_protocol ipv6_protocol __net_protocol;
extern int ipv6_has_addr ( struct net_device *netdev, struct in6_addr *addr );
extern int ipv6_slaac ( struct net_device *netdev, struct in6_addr *prefix,
unsigned int prefix_len, struct in6_addr *router );
extern int ipv6_set_prefix ( struct net_device *netdev, struct in6_addr *prefix,
unsigned int prefix_len, struct in6_addr *router );
extern int ipv6_set_address ( struct net_device *netdev,
struct in6_addr *address );
#endif /* _IPXE_IPV6_H */

214
src/net/ipv6.c
View File

@ -67,6 +67,24 @@ static uint32_t ipv6col ( struct in6_addr *in ) {
return crc32_le ( 0, in, sizeof ( *in ) );
}
/**
* Dump IPv6 routing table entry
*
* @v miniroute Routing table entry
*/
static inline __attribute__ (( always_inline )) void
ipv6_dump_miniroute ( struct ipv6_miniroute *miniroute ) {
struct net_device *netdev = miniroute->netdev;
DBGC ( netdev, "IPv6 %s has %s %s/%d", netdev->name,
( ( miniroute->flags & IPV6_HAS_ADDRESS ) ?
"address" : "prefix" ),
inet6_ntoa ( &miniroute->address ), miniroute->prefix_len );
if ( miniroute->flags & IPV6_HAS_ROUTER )
DBGC ( netdev, " router %s", inet6_ntoa ( &miniroute->router ));
DBGC ( netdev, "\n" );
}
/**
* Check if network device has a specific IPv6 address
*
@ -79,6 +97,7 @@ int ipv6_has_addr ( struct net_device *netdev, struct in6_addr *addr ) {
list_for_each_entry ( miniroute, &ipv6_miniroutes, list ) {
if ( ( miniroute->netdev == netdev ) &&
( miniroute->flags & IPV6_HAS_ADDRESS ) &&
( memcmp ( &miniroute->address, addr,
sizeof ( miniroute->address ) ) == 0 ) ) {
/* Found matching address */
@ -109,31 +128,45 @@ static int ipv6_is_on_link ( struct ipv6_miniroute *miniroute,
}
/**
* Add IPv6 minirouting table entry
* Find IPv6 routing table entry for a given address
*
* @v netdev Network device
* @v address IPv6 address
* @ret miniroute Routing table entry, or NULL if not found
*/
static struct ipv6_miniroute * ipv6_miniroute ( struct net_device *netdev,
struct in6_addr *address ) {
struct ipv6_miniroute *miniroute;
list_for_each_entry ( miniroute, &ipv6_miniroutes, list ) {
if ( ( miniroute->netdev == netdev ) &&
ipv6_is_on_link ( miniroute, address ) ) {
return miniroute;
}
}
return NULL;
}
/**
* Add IPv6 routing table entry
*
* @v netdev Network device
* @v address IPv6 address (or prefix)
* @v prefix_len Prefix length
* @v router Router address (or NULL)
* @v flags Flags
* @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 ) {
static struct ipv6_miniroute * ipv6_add_miniroute ( struct net_device *netdev,
struct in6_addr *address,
unsigned int prefix_len,
unsigned int flags ) {
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 */
/* Create routing table entry */
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;
@ -144,41 +177,83 @@ add_ipv6_miniroute ( struct net_device *netdev, struct in6_addr *address,
}
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 );
}
miniroute->flags = flags;
list_add ( &miniroute->list, &ipv6_miniroutes );
ipv6_dump_miniroute ( miniroute );
return miniroute;
}
/**
* Delete IPv6 minirouting table entry
* Define IPv6 on-link prefix
*
* @v miniroute Routing table entry
* @v netdev Network device
* @v prefix IPv6 address prefix
* @v prefix_len Prefix length
* @v router Router address (or NULL)
* @ret rc Return status code
*/
static void del_ipv6_miniroute ( struct ipv6_miniroute *miniroute ) {
struct net_device *netdev = miniroute->netdev;
int ipv6_set_prefix ( struct net_device *netdev, struct in6_addr *prefix,
unsigned int prefix_len, struct in6_addr *router ) {
struct ipv6_miniroute *miniroute;
int changed;
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 );
/* Find or create routing table entry */
miniroute = ipv6_miniroute ( netdev, prefix );
if ( ! miniroute )
miniroute = ipv6_add_miniroute ( netdev, prefix, prefix_len, 0);
if ( ! miniroute )
return -ENOMEM;
netdev_put ( miniroute->netdev );
/* Record router and add to start or end of list as appropriate */
list_del ( &miniroute->list );
free ( miniroute );
if ( router ) {
changed = ( ( ! ( miniroute->flags & IPV6_HAS_ROUTER ) ) ||
( memcmp ( &miniroute->router, router,
sizeof ( miniroute->router ) ) != 0 ) );
miniroute->flags |= IPV6_HAS_ROUTER;
memcpy ( &miniroute->router, router,
sizeof ( miniroute->router ) );
list_add_tail ( &miniroute->list, &ipv6_miniroutes );
} else {
changed = ( miniroute->flags & IPV6_HAS_ROUTER );
miniroute->flags &= ~IPV6_HAS_ROUTER;
list_add ( &miniroute->list, &ipv6_miniroutes );
}
if ( changed )
ipv6_dump_miniroute ( miniroute );
return 0;
}
/**
* Add IPv6 on-link address
*
* @v netdev Network device
* @v address IPv6 address
* @ret rc Return status code
*
* An on-link prefix for the address must already exist.
*/
int ipv6_set_address ( struct net_device *netdev, struct in6_addr *address ) {
struct ipv6_miniroute *miniroute;
int changed;
/* Find routing table entry */
miniroute = ipv6_miniroute ( netdev, address );
if ( ! miniroute )
return -EADDRNOTAVAIL;
/* Record address */
changed = ( ( ! ( miniroute->flags & IPV6_HAS_ADDRESS ) ) ||
( memcmp ( &miniroute->address, address,
sizeof ( miniroute->address ) ) != 0 ) );
memcpy ( &miniroute->address, address, sizeof ( miniroute->address ) );
miniroute->flags |= IPV6_HAS_ADDRESS;
if ( changed )
ipv6_dump_miniroute ( miniroute );
return 0;
}
/**
@ -200,6 +275,10 @@ static struct ipv6_miniroute * ipv6_route ( unsigned int scope_id,
if ( ! netdev_is_open ( miniroute->netdev ) )
continue;
/* Skip routing table entries with no usable source address */
if ( ! ( miniroute->flags & IPV6_HAS_ADDRESS ) )
continue;
if ( IN6_IS_ADDR_LINKLOCAL ( *dest ) ||
IN6_IS_ADDR_MULTICAST ( *dest ) ) {
@ -221,7 +300,7 @@ static struct ipv6_miniroute * ipv6_route ( unsigned int scope_id,
* address, and we have a default gateway,
* then use this route.
*/
if ( miniroute->has_router ) {
if ( miniroute->flags & IPV6_HAS_ROUTER ) {
*dest = &miniroute->router;
return miniroute;
}
@ -919,53 +998,6 @@ struct setting_type setting_type_ipv6 __setting_type = {
.format = format_ipv6_setting,
};
/**
* Perform IPv6 stateless address autoconfiguration (SLAAC)
*
* @v netdev Network device
* @v prefix Prefix
* @v prefix_len Prefix length
* @v router Router address (or NULL)
* @ret rc Return status code
*/
int ipv6_slaac ( struct net_device *netdev, struct in6_addr *prefix,
unsigned int prefix_len, struct in6_addr *router ) {
struct ipv6_miniroute *miniroute;
struct ipv6_miniroute *tmp;
struct in6_addr address;
int check_prefix_len;
int rc;
/* Construct local address */
memcpy ( &address, prefix, sizeof ( address ) );
check_prefix_len = ipv6_eui64 ( &address, netdev );
if ( check_prefix_len < 0 ) {
rc = check_prefix_len;
DBGC ( netdev, "IPv6 %s could not construct SLAAC address: "
"%s\n", netdev->name, strerror ( rc ) );
return rc;
}
if ( check_prefix_len != ( int ) prefix_len ) {
DBGC ( netdev, "IPv6 %s incorrect SLAAC prefix length %d "
"(expected %d)\n", netdev->name, prefix_len,
check_prefix_len );
return -EINVAL;
}
/* Delete any existing SLAAC miniroutes for this prefix */
list_for_each_entry_safe ( miniroute, tmp, &ipv6_miniroutes, list ) {
if ( ipv6_is_on_link ( miniroute, &address ) )
del_ipv6_miniroute ( miniroute );
}
/* Add miniroute */
miniroute = add_ipv6_miniroute ( netdev, &address, prefix_len, router );
if ( ! miniroute )
return -ENOMEM;
return 0;
}
/**
* Create IPv6 network device
*
@ -989,7 +1021,8 @@ static int ipv6_probe ( struct net_device *netdev ) {
}
/* Create link-local address for this network device */
miniroute = add_ipv6_miniroute ( netdev, &address, prefix_len, NULL );
miniroute = ipv6_add_miniroute ( netdev, &address, prefix_len,
IPV6_HAS_ADDRESS );
if ( ! miniroute )
return -ENOMEM;
@ -1007,8 +1040,11 @@ static void ipv6_remove ( struct net_device *netdev ) {
/* 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 );
if ( miniroute->netdev == netdev ) {
netdev_put ( miniroute->netdev );
list_del ( &miniroute->list );
free ( miniroute );
}
}
}

97
src/net/ndp.c
View File

@ -88,8 +88,8 @@ static int ndp_tx_ll_addr ( struct net_device *netdev,
/* Transmit packet */
if ( ( rc = tcpip_tx ( iobuf, &icmpv6_protocol, st_src, st_dest,
netdev, &ndp->icmp.chksum ) ) != 0 ) {
DBGC ( netdev, "NDP could not transmit packet: %s\n",
strerror ( rc ) );
DBGC ( netdev, "NDP %s could not transmit packet: %s\n",
netdev->name, strerror ( rc ) );
return rc;
}
@ -205,8 +205,9 @@ ndp_rx_neighbour_solicitation_ll_source ( struct net_device *netdev,
/* Sanity check */
if ( offsetof ( typeof ( *ll_addr_opt ),
ll_addr[ll_protocol->ll_addr_len] ) > len ) {
DBGC ( netdev, "NDP neighbour solicitation link-layer address "
"option too short at %zd bytes\n", len );
DBGC ( netdev, "NDP %s neighbour solicitation link-layer "
"address option too short at %zd bytes\n",
netdev->name, len );
return -EINVAL;
}
@ -214,8 +215,8 @@ ndp_rx_neighbour_solicitation_ll_source ( struct net_device *netdev,
if ( ( rc = neighbour_define ( netdev, &ipv6_protocol,
&sin6_src->sin6_addr,
ll_addr_opt->ll_addr ) ) != 0 ) {
DBGC ( netdev, "NDP could not define %s => %s: %s\n",
inet6_ntoa ( &sin6_src->sin6_addr ),
DBGC ( netdev, "NDP %s could not define %s => %s: %s\n",
netdev->name, inet6_ntoa ( &sin6_src->sin6_addr ),
ll_protocol->ntoa ( ll_addr_opt->ll_addr ),
strerror ( rc ) );
return rc;
@ -260,16 +261,17 @@ ndp_rx_neighbour_advertisement_ll_target ( struct net_device *netdev,
/* Sanity check */
if ( offsetof ( typeof ( *ll_addr_opt ),
ll_addr[ll_protocol->ll_addr_len] ) > len ) {
DBGC ( netdev, "NDP neighbour advertisement link-layer address "
"option too short at %zd bytes\n", len );
DBGC ( netdev, "NDP %s neighbour advertisement link-layer "
"address option too short at %zd bytes\n",
netdev->name, len );
return -EINVAL;
}
/* Update neighbour cache entry, if any */
if ( ( rc = neighbour_update ( netdev, &ipv6_protocol, &neigh->target,
ll_addr_opt->ll_addr ) ) != 0 ) {
DBGC ( netdev, "NDP could not update %s => %s: %s\n",
inet6_ntoa ( &neigh->target ),
DBGC ( netdev, "NDP %s could not update %s => %s: %s\n",
netdev->name, inet6_ntoa ( &neigh->target ),
ll_protocol->ntoa ( ll_addr_opt->ll_addr ),
strerror ( rc ) );
return rc;
@ -300,8 +302,8 @@ ndp_rx_router_advertisement_ll_source ( struct net_device *netdev,
/* Sanity check */
if ( offsetof ( typeof ( *ll_addr_opt ),
ll_addr[ll_protocol->ll_addr_len] ) > len ) {
DBGC ( netdev, "NDP router advertisement link-layer address "
"option too short at %zd bytes\n", len );
DBGC ( netdev, "NDP %s router advertisement link-layer address "
"option too short at %zd bytes\n", netdev->name, len );
return -EINVAL;
}
@ -309,8 +311,8 @@ ndp_rx_router_advertisement_ll_source ( struct net_device *netdev,
if ( ( rc = neighbour_define ( netdev, &ipv6_protocol,
&sin6_src->sin6_addr,
ll_addr_opt->ll_addr ) ) != 0 ) {
DBGC ( netdev, "NDP could not define %s => %s: %s\n",
inet6_ntoa ( &sin6_src->sin6_addr ),
DBGC ( netdev, "NDP %s could not define %s => %s: %s\n",
netdev->name, inet6_ntoa ( &sin6_src->sin6_addr ),
ll_protocol->ntoa ( ll_addr_opt->ll_addr ),
strerror ( rc ) );
return rc;
@ -337,16 +339,18 @@ ndp_rx_router_advertisement_prefix ( struct net_device *netdev,
struct ndp_router_advertisement_header *radv = &ndp->radv;
struct ndp_prefix_information_option *prefix_opt = &option->prefix;
struct in6_addr *router = &sin6_src->sin6_addr;
struct in6_addr address;
int prefix_len;
int rc;
/* Sanity check */
if ( sizeof ( *prefix_opt ) > len ) {
DBGC ( netdev, "NDP router advertisement prefix option too "
"short at %zd bytes\n", len );
DBGC ( netdev, "NDP %s router advertisement prefix option too "
"short at %zd bytes\n", netdev->name, len );
return -EINVAL;
}
DBGC ( netdev, "NDP found %sdefault router %s ",
( radv->lifetime ? "" : "non-" ),
DBGC ( netdev, "NDP %s found %sdefault router %s ",
netdev->name, ( radv->lifetime ? "" : "non-" ),
inet6_ntoa ( &sin6_src->sin6_addr ) );
DBGC ( netdev, "for %s-link %sautonomous prefix %s/%d\n",
( ( prefix_opt->flags & NDP_PREFIX_ON_LINK ) ? "on" : "off" ),
@ -354,17 +358,41 @@ ndp_rx_router_advertisement_prefix ( struct net_device *netdev,
inet6_ntoa ( &prefix_opt->prefix ),
prefix_opt->prefix_len );
/* Ignore off-link prefixes */
if ( ! ( prefix_opt->flags & NDP_PREFIX_ON_LINK ) )
return 0;
/* Define prefix */
if ( ( rc = ipv6_set_prefix ( netdev, &prefix_opt->prefix,
prefix_opt->prefix_len,
( radv->lifetime ?
router : NULL ) ) ) != 0 ) {
DBGC ( netdev, "NDP %s could not define prefix %s/%d: %s\n",
netdev->name, inet6_ntoa ( &prefix_opt->prefix ),
prefix_opt->prefix_len, strerror ( rc ) );
return rc;
}
/* Perform stateless address autoconfiguration, if applicable */
if ( ( prefix_opt->flags &
( NDP_PREFIX_ON_LINK | NDP_PREFIX_AUTONOMOUS ) ) ==
( NDP_PREFIX_ON_LINK | NDP_PREFIX_AUTONOMOUS ) ) {
if ( ( rc = ipv6_slaac ( netdev, &prefix_opt->prefix,
prefix_opt->prefix_len,
( radv->lifetime ?
router : NULL ) ) ) != 0 ) {
DBGC ( netdev, "NDP could not autoconfigure prefix %s/"
"%d: %s\n", inet6_ntoa ( &prefix_opt->prefix ),
prefix_opt->prefix_len, strerror ( rc ) );
if ( prefix_opt->flags & NDP_PREFIX_AUTONOMOUS ) {
memcpy ( &address, &prefix_opt->prefix, sizeof ( address ) );
prefix_len = ipv6_eui64 ( &address, netdev );
if ( prefix_len < 0 ) {
rc = prefix_len;
DBGC ( netdev, "NDP %s could not construct SLAAC "
"address: %s\n", netdev->name, strerror ( rc ) );
return rc;
}
if ( prefix_len != prefix_opt->prefix_len ) {
DBGC ( netdev, "NDP %s incorrect SLAAC prefix length "
"%d (expected %d)\n", netdev->name,
prefix_opt->prefix_len, prefix_len );
return -EINVAL;
}
if ( ( rc = ipv6_set_address ( netdev, &address ) ) != 0 ) {
DBGC ( netdev, "NDP %s could not set address %s: %s\n",
netdev->name, inet6_ntoa ( &address ),
strerror ( rc ) );
return rc;
}
}
@ -467,8 +495,8 @@ static int ndp_rx_options ( struct net_device *netdev,
/* Sanity check */
if ( len < offset ) {
DBGC ( netdev, "NDP packet too short at %zd bytes (min %zd "
"bytes)\n", len, offset );
DBGC ( netdev, "NDP %s packet too short at %zd bytes (min %zd "
"bytes)\n", netdev->name, len, offset );
return -EINVAL;
}
@ -482,7 +510,8 @@ static int ndp_rx_options ( struct net_device *netdev,
( option->header.blocks == 0 ) ||
( remaining < ( option->header.blocks *
NDP_OPTION_BLKSZ ) ) ) {
DBGC ( netdev, "NDP bad option length:\n" );
DBGC ( netdev, "NDP %s bad option length:\n",
netdev->name );
DBGC_HDA ( netdev, 0, option, remaining );
return -EINVAL;
}
@ -715,9 +744,9 @@ static int ipv6conf_rx_router_advertisement ( struct net_device *netdev,
stateful = ( flags & NDP_ROUTER_MANAGED );
if ( ( rc = start_dhcpv6 ( &ipv6conf->dhcp, netdev,
stateful ) ) != 0 ) {
DBGC ( netdev, "NDP could not start state%s DHCPv6: "
"%s\n", ( stateful ? "ful" : "less" ),
strerror ( rc ) );
DBGC ( netdev, "NDP %s could not start state%s DHCPv6: "
"%s\n", netdev->name,
( stateful ? "ful" : "less" ), strerror ( rc ) );
ipv6conf_done ( ipv6conf, rc );
return rc;
}

4
src/usr/route_ipv6.c
View File

@ -44,8 +44,10 @@ static void route_ipv6_print ( struct net_device *netdev ) {
printf ( "%s: %s/%d", netdev->name,
inet6_ntoa ( &miniroute->address ),
miniroute->prefix_len );
if ( miniroute->has_router )
if ( miniroute->flags & IPV6_HAS_ROUTER )
printf ( " gw %s", inet6_ntoa ( &miniroute->router ) );
if ( ! ( miniroute->flags & IPV6_HAS_ADDRESS ) )
printf ( " (no address)" );
if ( ! netdev_is_open ( miniroute->netdev ) )
printf ( " (inaccessible)" );
printf ( "\n" );