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[ipv6] Expose IPv6 settings acquired through NDP 

Expose the IPv6 address (or prefix) as ${ip6}, the prefix length as
${len6}, and the router address as ${gateway6}.

Originally-implemented-by: Hannes Reinecke <hare@suse.de>
Originally-implemented-by: Marin Hannache <git@mareo.fr>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/56/head
Michael Brown 2016-07-18 15:13:10 +01:00
parent ee54ab5be6
commit 3b783d7fd2
3 changed files with 282 additions and 5 deletions
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9
src/include/ipxe/settings.h
View File

@ -284,6 +284,9 @@ struct builtin_setting {
extern const struct settings_scope builtin_scope;
/** IPv6 setting scope */
extern const struct settings_scope ipv6_scope;
/** DHCPv6 setting scope */
extern const struct settings_scope dhcpv6_scope;
/**
@ -433,6 +436,12 @@ gateway_setting __setting ( SETTING_IP4, gateway );
extern const struct setting
dns_setting __setting ( SETTING_IP4_EXTRA, dns );
extern const struct setting
ip6_setting __setting ( SETTING_IP6, ip6 );
extern const struct setting
len6_setting __setting ( SETTING_IP6, len6 );
extern const struct setting
gateway6_setting __setting ( SETTING_IP6, gateway6 );
extern const struct setting
hostname_setting __setting ( SETTING_HOST, hostname );
extern const struct setting
domain_setting __setting ( SETTING_IP_EXTRA, domain );

27
src/net/ipv6.c
View File

@ -1061,6 +1061,33 @@ int format_ipv6_setting ( const struct setting_type *type __unused,
return snprintf ( buf, len, "%s", inet6_ntoa ( ipv6 ) );
}
/** IPv6 settings scope */
const struct settings_scope ipv6_scope;
/** IPv6 address setting */
const struct setting ip6_setting __setting ( SETTING_IP6, ip6 ) = {
.name = "ip6",
.description = "IPv6 address",
.type = &setting_type_ipv6,
.scope = &ipv6_scope,
};
/** IPv6 prefix length setting */
const struct setting len6_setting __setting ( SETTING_IP6, len6 ) = {
.name = "len6",
.description = "IPv6 prefix length",
.type = &setting_type_int8,
.scope = &ipv6_scope,
};
/** Default gateway setting */
const struct setting gateway6_setting __setting ( SETTING_IP6, gateway6 ) = {
.name = "gateway6",
.description = "IPv6 gateway",
.type = &setting_type_ipv6,
.scope = &ipv6_scope,
};
/**
* Create IPv6 network device
*

251
src/net/ndp.c
View File

@ -20,6 +20,7 @@
FILE_LICENCE ( GPL2_OR_LATER );
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <byteswap.h>
@ -41,6 +42,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
static struct ipv6conf * ipv6conf_demux ( struct net_device *netdev );
static int
ipv6conf_rx_router_advertisement ( struct net_device *netdev,
struct in6_addr *router,
struct ndp_router_advertisement_header *radv,
size_t len );
@ -585,6 +587,7 @@ ndp_rx_router_advertisement ( struct io_buffer *iobuf,
struct sockaddr_in6 *sin6_dest __unused ) {
union ndp_header *ndp = iobuf->data;
struct ndp_router_advertisement_header *radv = &ndp->radv;
struct in6_addr *router = &sin6_src->sin6_addr;
size_t len = iob_len ( iobuf );
int rc;
@ -595,8 +598,8 @@ ndp_rx_router_advertisement ( struct io_buffer *iobuf,
goto err_options;
/* Pass to IPv6 autoconfiguration */
if ( ( rc = ipv6conf_rx_router_advertisement ( netdev, radv,
len ) ) != 0 )
if ( ( rc = ipv6conf_rx_router_advertisement ( netdev, router,
radv, len ) ) != 0 )
goto err_ipv6conf;
err_ipv6conf:
@ -627,12 +630,26 @@ struct icmpv6_handler ndp_handlers[] __icmpv6_handler = {
*
*/
/** An NDP prefix settings block */
struct ndp_prefix_settings {
/** Settings interface */
struct settings settings;
/** Name */
char name[4];
/** Prefix information option */
struct ndp_prefix_information_option *prefix;
};
/** An NDP settings block */
struct ndp_settings {
/** Reference counter */
struct refcnt refcnt;
/** Settings interface */
struct settings settings;
/** Router address */
struct in6_addr router;
/** Router lifetime */
unsigned int lifetime;
/** Length of NDP options */
size_t len;
/** NDP options */
@ -779,22 +796,207 @@ static struct settings_operations ndp_settings_operations = {
.fetch = ndp_fetch,
};
/**
* Check applicability of NDP per-prefix setting
*
* @v settings Settings block
* @v setting Setting to fetch
* @ret applies Setting applies within this settings block
*/
static int ndp_prefix_applies ( struct settings *settings __unused,
const struct setting *setting ) {
return ( setting->scope == &ipv6_scope );
}
/**
* Fetch value of NDP IPv6 address setting
*
* @v settings Settings block
* @v data Buffer to fill with setting data
* @v len Length of buffer
* @ret len Length of setting data, or negative error
*/
static int ndp_prefix_fetch_ip6 ( struct settings *settings, void *data,
size_t len ) {
struct ndp_prefix_settings *prefset =
container_of ( settings, struct ndp_prefix_settings, settings );
struct ndp_settings *ndpset =
container_of ( settings->parent, struct ndp_settings, settings);
struct net_device *netdev =
container_of ( ndpset->settings.parent, struct net_device,
settings.settings );
struct ndp_prefix_information_option *prefix = prefset->prefix;
struct in6_addr ip6;
int prefix_len;
/* Skip dead prefixes */
if ( ! prefix->valid )
return -ENOENT;
/* Construct IPv6 address via SLAAC, if applicable */
memcpy ( &ip6, &prefix->prefix, sizeof ( ip6 ) );
if ( prefix->flags & NDP_PREFIX_AUTONOMOUS ) {
prefix_len = ipv6_eui64 ( &ip6, netdev );
if ( prefix_len < 0 )
return prefix_len;
if ( prefix_len != prefix->prefix_len )
return -EINVAL;
}
/* Fill in IPv6 address */
if ( len > sizeof ( ip6 ) )
len = sizeof ( ip6 );
memcpy ( data, &ip6, len );
return sizeof ( ip6 );
}
/**
* Fetch value of NDP prefix length setting
*
* @v settings Settings block
* @v data Buffer to fill with setting data
* @v len Length of buffer
* @ret len Length of setting data, or negative error
*/
static int ndp_prefix_fetch_len6 ( struct settings *settings, void *data,
size_t len ) {
struct ndp_prefix_settings *prefset =
container_of ( settings, struct ndp_prefix_settings, settings );
struct ndp_prefix_information_option *prefix = prefset->prefix;
uint8_t *len6;
/* Fill in prefix length */
if ( len >= sizeof ( *len6 ) ) {
/* We treat an off-link prefix as having a prefix
* length covering the entire IPv6 address.
*/
len6 = data;
*len6 = ( ( prefix->flags & NDP_PREFIX_ON_LINK ) ?
prefix->prefix_len : -1UL );
}
return sizeof ( *len6 );
}
/**
* Fetch value of NDP router address setting
*
* @v settings Settings block
* @v data Buffer to fill with setting data
* @v len Length of buffer
* @ret len Length of setting data, or negative error
*/
static int ndp_prefix_fetch_gateway6 ( struct settings *settings,
void *data, size_t len ) {
struct ndp_settings *ndpset =
container_of ( settings->parent, struct ndp_settings, settings);
/* Treat non-routing router as non-existent */
if ( ! ndpset->lifetime )
return -ENOENT;
/* Fill in router address */
if ( len > sizeof ( ndpset->router ) )
len = sizeof ( ndpset->router );
memcpy ( data, &ndpset->router, len );
return sizeof ( ndpset->router );
}
/** An NDP per-prefix setting operation */
struct ndp_prefix_operation {
/** Generic setting */
const struct setting *setting;
/**
* Fetch value of setting
*
* @v settings Settings block
* @v data Buffer to fill with setting data
* @v len Length of buffer
* @ret len Length of setting data, or negative error
*/
int ( * fetch ) ( struct settings *settings, void *data, size_t len );
};
/** NDP per-prefix settings operations */
static struct ndp_prefix_operation ndp_prefix_operations[] = {
{ &ip6_setting, ndp_prefix_fetch_ip6 },
{ &len6_setting, ndp_prefix_fetch_len6 },
{ &gateway6_setting, ndp_prefix_fetch_gateway6 },
};
/**
* Fetch value of NDP pre-prefix setting
*
* @v settings Settings block
* @v setting Setting to fetch
* @v data Buffer to fill with setting data
* @v len Length of buffer
* @ret len Length of setting data, or negative error
*/
static int ndp_prefix_fetch ( struct settings *settings,
struct setting *setting,
void *data, size_t len ) {
struct ndp_prefix_operation *op;
unsigned int i;
/* Handle per-prefix settings */
for ( i = 0 ; i < ( sizeof ( ndp_prefix_operations ) /
sizeof ( ndp_prefix_operations[0] ) ) ; i++ ) {
op = &ndp_prefix_operations[i];
if ( setting_cmp ( setting, op->setting ) == 0 )
return op->fetch ( settings, data, len );
}
return -ENOENT;
}
/** NDP per-prefix settings operations */
static struct settings_operations ndp_prefix_settings_operations = {
.applies = ndp_prefix_applies,
.fetch = ndp_prefix_fetch,
};
/**
* Register NDP settings
*
* @v netdev Network device
* @v router Router address
* @v lifetime Router lifetime
* @v options NDP options
* @v len Length of options
* @ret rc Return status code
*/
static int ndp_register_settings ( struct net_device *netdev,
struct in6_addr *router,
unsigned int lifetime,
union ndp_option *options, size_t len ) {
struct settings *parent = netdev_settings ( netdev );
union ndp_option *option;
struct ndp_settings *ndpset;
struct ndp_prefix_settings *prefset;
size_t offset;
size_t option_len;
unsigned int prefixes;
unsigned int instance;
int rc;
/* Count number of prefix options. We can assume that the
* options are well-formed, otherwise they would have been
* rejected prior to being stored.
*/
for ( prefixes = 0, offset = 0 ; offset < len ; offset += option_len ) {
option = ( ( ( void * ) options ) + offset );
option_len = ( option->header.blocks * NDP_OPTION_BLKSZ );
if ( option->header.type == NDP_OPT_PREFIX )
prefixes++;
}
/* Allocate and initialise structure */
ndpset = zalloc ( sizeof ( *ndpset ) + len );
ndpset = zalloc ( sizeof ( *ndpset ) + len +
( prefixes * sizeof ( *prefset ) ) );
if ( ! ndpset ) {
rc = -ENOMEM;
goto err_alloc;
@ -802,14 +1004,50 @@ static int ndp_register_settings ( struct net_device *netdev,
ref_init ( &ndpset->refcnt, NULL );
settings_init ( &ndpset->settings, &ndp_settings_operations,
&ndpset->refcnt, &ndp_settings_scope );
memcpy ( &ndpset->router, router, sizeof ( ndpset->router ) );
ndpset->lifetime = lifetime;
ndpset->len = len;
memcpy ( ndpset->options, options, len );
prefset = ( ( ( void * ) ndpset->options ) + len );
/* Register settings */
if ( ( rc = register_settings ( &ndpset->settings, parent,
NDP_SETTINGS_NAME ) ) != 0 )
goto err_register;
/* Construct and register per-prefix settings */
for ( instance = 0, offset = 0 ; offset < len ; offset += option_len ) {
/* Skip non-prefix options */
option = ( ( ( void * ) ndpset->options ) + offset );
option_len = ( option->header.blocks * NDP_OPTION_BLKSZ );
if ( option->header.type != NDP_OPT_PREFIX )
continue;
/* Initialise structure */
settings_init ( &prefset->settings,
&ndp_prefix_settings_operations,
&ndpset->refcnt, &ndp_settings_scope );
prefset->prefix = &option->prefix;
snprintf ( prefset->name, sizeof ( prefset->name ), "%d",
instance++ );
/* Register settings */
if ( ( rc = register_settings ( &prefset->settings,
&ndpset->settings,
prefset->name ) ) != 0 )
goto err_register_prefix;
/* Move to next per-prefix settings */
prefset++;
}
assert ( instance == prefixes );
ref_put ( &ndpset->refcnt );
return 0;
err_register_prefix:
unregister_settings ( &ndpset->settings );
err_register:
ref_put ( &ndpset->refcnt );
err_alloc:
@ -938,6 +1176,7 @@ static void ipv6conf_expired ( struct retry_timer *timer, int fail ) {
* Handle router advertisement during IPv6 autoconfiguration
*
* @v netdev Network device
* @v router Router address
* @v radv Router advertisement
* @v len Length of router advertisement
* @ret rc Return status code
@ -947,6 +1186,7 @@ static void ipv6conf_expired ( struct retry_timer *timer, int fail ) {
*/
static int
ipv6conf_rx_router_advertisement ( struct net_device *netdev,
struct in6_addr *router,
struct ndp_router_advertisement_header *radv,
size_t len ) {
struct ipv6conf *ipv6conf;
@ -970,8 +1210,9 @@ ipv6conf_rx_router_advertisement ( struct net_device *netdev,
/* Register NDP settings */
option_len = ( len - offsetof ( typeof ( *radv ), option ) );
if ( ( rc = ndp_register_settings ( netdev, radv->option,
option_len ) ) != 0 )
if ( ( rc = ndp_register_settings ( netdev, router,
ntohl ( radv->lifetime ),
radv->option, option_len ) ) != 0 )
return rc;
/* Start DHCPv6 if required */