diff options
Diffstat (limited to 'qemu/roms/ipxe/src/net/ndp.c')
| -rw-r--r-- | qemu/roms/ipxe/src/net/ndp.c | 1010 |
1 files changed, 0 insertions, 1010 deletions
diff --git a/qemu/roms/ipxe/src/net/ndp.c b/qemu/roms/ipxe/src/net/ndp.c deleted file mode 100644 index e62f7d5cb..000000000 --- a/qemu/roms/ipxe/src/net/ndp.c +++ /dev/null @@ -1,1010 +0,0 @@ -/* - * 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 <stdlib.h> -#include <string.h> -#include <errno.h> -#include <byteswap.h> -#include <ipxe/in.h> -#include <ipxe/iobuf.h> -#include <ipxe/tcpip.h> -#include <ipxe/ipv6.h> -#include <ipxe/icmpv6.h> -#include <ipxe/neighbour.h> -#include <ipxe/dhcpv6.h> -#include <ipxe/ndp.h> - -/** @file - * - * IPv6 neighbour discovery protocol - * - */ - -static int -ipv6conf_rx_router_advertisement ( struct net_device *netdev, - struct ndp_router_advertisement_header *radv, - size_t len ); - -/** - * Transmit NDP packet with link-layer address option - * - * @v netdev Network device - * @v sin6_src Source socket address - * @v sin6_dest Destination socket address - * @v data NDP header - * @v len Size of NDP header - * @v option_type NDP option type - * @ret rc Return status code - */ -static int ndp_tx_ll_addr ( struct net_device *netdev, - struct sockaddr_in6 *sin6_src, - struct sockaddr_in6 *sin6_dest, - const void *data, size_t len, - unsigned int option_type ) { - struct sockaddr_tcpip *st_src = - ( ( struct sockaddr_tcpip * ) sin6_src ); - struct sockaddr_tcpip *st_dest = - ( ( struct sockaddr_tcpip * ) sin6_dest ); - struct ll_protocol *ll_protocol = netdev->ll_protocol; - struct io_buffer *iobuf; - struct ndp_ll_addr_option *ll_addr_opt; - union ndp_header *ndp; - size_t option_len; - int rc; - - /* Allocate and populate buffer */ - option_len = ( ( sizeof ( *ll_addr_opt ) + - ll_protocol->ll_addr_len + NDP_OPTION_BLKSZ - 1 ) & - ~( NDP_OPTION_BLKSZ - 1 ) ); - iobuf = alloc_iob ( MAX_LL_NET_HEADER_LEN + len + option_len ); - if ( ! iobuf ) - return -ENOMEM; - iob_reserve ( iobuf, MAX_LL_NET_HEADER_LEN ); - memcpy ( iob_put ( iobuf, len ), data, len ); - ll_addr_opt = iob_put ( iobuf, option_len ); - ll_addr_opt->header.type = option_type; - ll_addr_opt->header.blocks = ( option_len / NDP_OPTION_BLKSZ ); - memcpy ( ll_addr_opt->ll_addr, netdev->ll_addr, - ll_protocol->ll_addr_len ); - ndp = iobuf->data; - ndp->icmp.chksum = tcpip_chksum ( ndp, ( len + option_len ) ); - - /* Transmit packet */ - if ( ( rc = tcpip_tx ( iobuf, &icmpv6_protocol, st_src, st_dest, - netdev, &ndp->icmp.chksum ) ) != 0 ) { - DBGC ( netdev, "NDP %s could not transmit packet: %s\n", - netdev->name, strerror ( rc ) ); - return rc; - } - - return 0; -} - -/** - * Transmit NDP neighbour discovery request - * - * @v netdev Network device - * @v net_protocol Network-layer protocol - * @v net_dest Destination network-layer address - * @v net_source Source network-layer address - * @ret rc Return status code - */ -static int ndp_tx_request ( struct net_device *netdev, - struct net_protocol *net_protocol __unused, - const void *net_dest, const void *net_source ) { - struct sockaddr_in6 sin6_src; - struct sockaddr_in6 sin6_dest; - struct ndp_neighbour_header neigh; - int rc; - - /* Construct source address */ - memset ( &sin6_src, 0, sizeof ( sin6_src ) ); - sin6_src.sin6_family = AF_INET6; - memcpy ( &sin6_src.sin6_addr, net_source, - sizeof ( sin6_src.sin6_addr ) ); - - /* Construct multicast destination address */ - memset ( &sin6_dest, 0, sizeof ( sin6_dest ) ); - sin6_dest.sin6_family = AF_INET6; - sin6_dest.sin6_scope_id = netdev->index; - ipv6_solicited_node ( &sin6_dest.sin6_addr, net_dest ); - - /* Construct neighbour header */ - memset ( &neigh, 0, sizeof ( neigh ) ); - neigh.icmp.type = ICMPV6_NEIGHBOUR_SOLICITATION; - memcpy ( &neigh.target, net_dest, sizeof ( neigh.target ) ); - - /* Transmit neighbour discovery packet */ - if ( ( rc = ndp_tx_ll_addr ( netdev, &sin6_src, &sin6_dest, &neigh, - sizeof ( neigh ), - NDP_OPT_LL_SOURCE ) ) != 0 ) - return rc; - - return 0; -} - -/** NDP neighbour discovery protocol */ -struct neighbour_discovery ndp_discovery = { - .name = "NDP", - .tx_request = ndp_tx_request, -}; - -/** - * Transmit NDP router solicitation - * - * @v netdev Network device - * @ret rc Return status code - */ -static int ndp_tx_router_solicitation ( struct net_device *netdev ) { - struct ndp_router_solicitation_header rsol; - struct sockaddr_in6 sin6_dest; - int rc; - - /* Construct multicast destination address */ - memset ( &sin6_dest, 0, sizeof ( sin6_dest ) ); - sin6_dest.sin6_family = AF_INET6; - sin6_dest.sin6_scope_id = netdev->index; - ipv6_all_routers ( &sin6_dest.sin6_addr ); - - /* Construct router solicitation */ - memset ( &rsol, 0, sizeof ( rsol ) ); - rsol.icmp.type = ICMPV6_ROUTER_SOLICITATION; - - /* Transmit packet */ - if ( ( rc = ndp_tx_ll_addr ( netdev, NULL, &sin6_dest, &rsol, - sizeof ( rsol ), NDP_OPT_LL_SOURCE ) ) !=0) - return rc; - - return 0; -} - -/** - * Process NDP neighbour solicitation source link-layer address option - * - * @v netdev Network device - * @v sin6_src Source socket address - * @v ndp NDP packet - * @v option NDP option - * @v len NDP option length - * @ret rc Return status code - */ -static int -ndp_rx_neighbour_solicitation_ll_source ( struct net_device *netdev, - struct sockaddr_in6 *sin6_src, - union ndp_header *ndp, - union ndp_option *option, - size_t len ) { - struct ndp_neighbour_header *neigh = &ndp->neigh; - struct ndp_ll_addr_option *ll_addr_opt = &option->ll_addr; - struct ll_protocol *ll_protocol = netdev->ll_protocol; - int rc; - - /* Silently ignore neighbour solicitations for addresses we do - * not own. - */ - if ( ! ipv6_has_addr ( netdev, &neigh->target ) ) - return 0; - - /* Sanity check */ - if ( offsetof ( typeof ( *ll_addr_opt ), - ll_addr[ll_protocol->ll_addr_len] ) > len ) { - DBGC ( netdev, "NDP %s neighbour solicitation link-layer " - "address option too short at %zd bytes\n", - netdev->name, len ); - return -EINVAL; - } - - /* Create or update neighbour cache entry */ - if ( ( rc = neighbour_define ( netdev, &ipv6_protocol, - &sin6_src->sin6_addr, - ll_addr_opt->ll_addr ) ) != 0 ) { - 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; - } - - /* Convert neighbour header to advertisement */ - memset ( neigh, 0, offsetof ( typeof ( *neigh ), target ) ); - neigh->icmp.type = ICMPV6_NEIGHBOUR_ADVERTISEMENT; - neigh->flags = ( NDP_NEIGHBOUR_SOLICITED | NDP_NEIGHBOUR_OVERRIDE ); - - /* Send neighbour advertisement */ - if ( ( rc = ndp_tx_ll_addr ( netdev, NULL, sin6_src, neigh, - sizeof ( *neigh ), - NDP_OPT_LL_TARGET ) ) != 0 ) - return rc; - - return 0; -} - -/** - * Process NDP neighbour advertisement target link-layer address option - * - * @v netdev Network device - * @v sin6_src Source socket address - * @v ndp NDP packet - * @v option NDP option - * @v len NDP option length - * @ret rc Return status code - */ -static int -ndp_rx_neighbour_advertisement_ll_target ( struct net_device *netdev, - struct sockaddr_in6 *sin6_src - __unused, - union ndp_header *ndp, - union ndp_option *option, - size_t len ) { - struct ndp_neighbour_header *neigh = &ndp->neigh; - struct ndp_ll_addr_option *ll_addr_opt = &option->ll_addr; - struct ll_protocol *ll_protocol = netdev->ll_protocol; - int rc; - - /* Sanity check */ - if ( offsetof ( typeof ( *ll_addr_opt ), - ll_addr[ll_protocol->ll_addr_len] ) > 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 %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; - } - - return 0; -} - -/** - * Process NDP router advertisement source link-layer address option - * - * @v netdev Network device - * @v sin6_src Source socket address - * @v ndp NDP packet - * @v option NDP option - * @v len NDP option length - * @ret rc Return status code - */ -static int -ndp_rx_router_advertisement_ll_source ( struct net_device *netdev, - struct sockaddr_in6 *sin6_src, - union ndp_header *ndp __unused, - union ndp_option *option, size_t len ) { - struct ndp_ll_addr_option *ll_addr_opt = &option->ll_addr; - struct ll_protocol *ll_protocol = netdev->ll_protocol; - int rc; - - /* Sanity check */ - if ( offsetof ( typeof ( *ll_addr_opt ), - ll_addr[ll_protocol->ll_addr_len] ) > len ) { - DBGC ( netdev, "NDP %s router advertisement link-layer address " - "option too short at %zd bytes\n", netdev->name, len ); - return -EINVAL; - } - - /* Define neighbour cache entry */ - if ( ( rc = neighbour_define ( netdev, &ipv6_protocol, - &sin6_src->sin6_addr, - ll_addr_opt->ll_addr ) ) != 0 ) { - 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; - } - - return 0; -} - -/** - * Process NDP router advertisement prefix information option - * - * @v netdev Network device - * @v sin6_src Source socket address - * @v ndp NDP packet - * @v option NDP option - * @v len NDP option length - * @ret rc Return status code - */ -static int -ndp_rx_router_advertisement_prefix ( struct net_device *netdev, - struct sockaddr_in6 *sin6_src, - union ndp_header *ndp, - union ndp_option *option, size_t len ) { - 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 %s router advertisement prefix option too " - "short at %zd bytes\n", netdev->name, len ); - return -EINVAL; - } - 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" ), - ( ( prefix_opt->flags & NDP_PREFIX_AUTONOMOUS ) ? "" : "non-" ), - 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_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; - } - } - - return 0; -} - -/** An NDP option handler */ -struct ndp_option_handler { - /** ICMPv6 type */ - uint8_t icmp_type; - /** Option type */ - uint8_t option_type; - /** - * Handle received option - * - * @v netdev Network device - * @v sin6_src Source socket address - * @v ndp NDP packet - * @v option NDP option - * @ret rc Return status code - */ - int ( * rx ) ( struct net_device *netdev, struct sockaddr_in6 *sin6_src, - union ndp_header *ndp, union ndp_option *option, - size_t len ); -}; - -/** NDP option handlers */ -static struct ndp_option_handler ndp_option_handlers[] = { - { - .icmp_type = ICMPV6_NEIGHBOUR_SOLICITATION, - .option_type = NDP_OPT_LL_SOURCE, - .rx = ndp_rx_neighbour_solicitation_ll_source, - }, - { - .icmp_type = ICMPV6_NEIGHBOUR_ADVERTISEMENT, - .option_type = NDP_OPT_LL_TARGET, - .rx = ndp_rx_neighbour_advertisement_ll_target, - }, - { - .icmp_type = ICMPV6_ROUTER_ADVERTISEMENT, - .option_type = NDP_OPT_LL_SOURCE, - .rx = ndp_rx_router_advertisement_ll_source, - }, - { - .icmp_type = ICMPV6_ROUTER_ADVERTISEMENT, - .option_type = NDP_OPT_PREFIX, - .rx = ndp_rx_router_advertisement_prefix, - }, -}; - -/** - * Process received NDP option - * - * @v netdev Network device - * @v sin6_src Source socket address - * @v ndp NDP packet - * @v option NDP option - * @v len Option length - * @ret rc Return status code - */ -static int ndp_rx_option ( struct net_device *netdev, - struct sockaddr_in6 *sin6_src, union ndp_header *ndp, - union ndp_option *option, size_t len ) { - struct ndp_option_handler *handler; - unsigned int i; - - /* Locate a suitable option handler, if any */ - for ( i = 0 ; i < ( sizeof ( ndp_option_handlers ) / - sizeof ( ndp_option_handlers[0] ) ) ; i++ ) { - handler = &ndp_option_handlers[i]; - if ( ( handler->icmp_type == ndp->icmp.type ) && - ( handler->option_type == option->header.type ) ) { - return handler->rx ( netdev, sin6_src, ndp, - option, len ); - } - } - - /* Silently ignore unknown options as per RFC 4861 */ - return 0; -} - -/** - * Process received NDP packet options - * - * @v netdev Network device - * @v sin6_src Source socket address - * @v ndp NDP header - * @v offset Offset to NDP options - * @v len Length of NDP packet - * @ret rc Return status code - */ -static int ndp_rx_options ( struct net_device *netdev, - struct sockaddr_in6 *sin6_src, - union ndp_header *ndp, size_t offset, size_t len ) { - union ndp_option *option; - size_t remaining; - size_t option_len; - int rc; - - /* Sanity check */ - if ( len < offset ) { - DBGC ( netdev, "NDP %s packet too short at %zd bytes (min %zd " - "bytes)\n", netdev->name, len, offset ); - return -EINVAL; - } - - /* Search for option */ - option = ( ( ( void * ) ndp ) + offset ); - remaining = ( len - offset ); - while ( remaining ) { - - /* Sanity check */ - if ( ( remaining < sizeof ( option->header ) ) || - ( option->header.blocks == 0 ) || - ( remaining < ( option->header.blocks * - NDP_OPTION_BLKSZ ) ) ) { - DBGC ( netdev, "NDP %s bad option length:\n", - netdev->name ); - DBGC_HDA ( netdev, 0, option, remaining ); - return -EINVAL; - } - option_len = ( option->header.blocks * NDP_OPTION_BLKSZ ); - - /* Handle option */ - if ( ( rc = ndp_rx_option ( netdev, sin6_src, ndp, option, - option_len ) ) != 0 ) - return rc; - - /* Move to next option */ - option = ( ( ( void * ) option ) + option_len ); - remaining -= option_len; - } - - return 0; -} - -/** - * Process received NDP neighbour solicitation or advertisement - * - * @v iobuf I/O buffer - * @v netdev Network device - * @v sin6_src Source socket address - * @v sin6_dest Destination socket address - * @ret rc Return status code - */ -static int ndp_rx_neighbour ( struct io_buffer *iobuf, - struct net_device *netdev, - struct sockaddr_in6 *sin6_src, - struct sockaddr_in6 *sin6_dest __unused ) { - union ndp_header *ndp = iobuf->data; - struct ndp_neighbour_header *neigh = &ndp->neigh; - size_t len = iob_len ( iobuf ); - int rc; - - /* Process options */ - if ( ( rc = ndp_rx_options ( netdev, sin6_src, ndp, - offsetof ( typeof ( *neigh ), option ), - len ) ) != 0 ) - goto err_options; - - err_options: - free_iob ( iobuf ); - return rc; -} - -/** - * Process received NDP router advertisement - * - * @v iobuf I/O buffer - * @v netdev Network device - * @v sin6_src Source socket address - * @v sin6_dest Destination socket address - * @ret rc Return status code - */ -static int -ndp_rx_router_advertisement ( struct io_buffer *iobuf, - struct net_device *netdev, - struct sockaddr_in6 *sin6_src, - struct sockaddr_in6 *sin6_dest __unused ) { - union ndp_header *ndp = iobuf->data; - struct ndp_router_advertisement_header *radv = &ndp->radv; - size_t len = iob_len ( iobuf ); - int rc; - - /* Process options */ - if ( ( rc = ndp_rx_options ( netdev, sin6_src, ndp, - offsetof ( typeof ( *radv ), option ), - len ) ) != 0 ) - goto err_options; - - /* Pass to IPv6 autoconfiguration */ - if ( ( rc = ipv6conf_rx_router_advertisement ( netdev, radv, - len ) ) != 0 ) - goto err_ipv6conf; - - err_ipv6conf: - err_options: - free_iob ( iobuf ); - return rc; -} - -/** NDP ICMPv6 handlers */ -struct icmpv6_handler ndp_handlers[] __icmpv6_handler = { - { - .type = ICMPV6_NEIGHBOUR_SOLICITATION, - .rx = ndp_rx_neighbour, - }, - { - .type = ICMPV6_NEIGHBOUR_ADVERTISEMENT, - .rx = ndp_rx_neighbour, - }, - { - .type = ICMPV6_ROUTER_ADVERTISEMENT, - .rx = ndp_rx_router_advertisement, - }, -}; - -/**************************************************************************** - * - * NDP settings - * - */ - -/** An NDP settings block */ -struct ndp_settings { - /** Reference counter */ - struct refcnt refcnt; - /** Settings interface */ - struct settings settings; - /** Length of NDP options */ - size_t len; - /** NDP options */ - union ndp_option option[0]; -}; - -/** NDP settings scope */ -static const struct settings_scope ndp_settings_scope; - -/** - * Construct NDP tag - * - * @v type NDP option type - * @v offset Starting offset of data - * @ret tag NDP tag - */ -#define NDP_TAG( type, offset ) ( ( (offset) << 8 ) | (type) ) - -/** - * Extract NDP tag type - * - * @v tag NDP tag - * @ret type NDP option type - */ -#define NDP_TAG_TYPE( tag ) ( (tag) & 0xff ) - -/** - * Extract NDP tag offset - * - * @v tag NDP tag - * @ret offset Starting offset of data - */ -#define NDP_TAG_OFFSET( tag ) ( (tag) >> 8 ) - -/** - * Check applicability of NDP setting - * - * @v settings Settings block - * @v setting Setting to fetch - * @ret applies Setting applies within this settings block - */ -static int ndp_applies ( struct settings *settings __unused, - const struct setting *setting ) { - - return ( setting->scope == &ndp_settings_scope ); -} - -/** - * Fetch value of NDP 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_fetch ( struct settings *settings, - struct setting *setting, - void *data, size_t len ) { - struct ndp_settings *ndpset = - container_of ( settings, struct ndp_settings, settings ); - struct net_device *netdev = - container_of ( settings->parent, struct net_device, - settings.settings ); - union ndp_option *option; - unsigned int type = NDP_TAG_TYPE ( setting->tag ); - unsigned int offset = NDP_TAG_OFFSET ( setting->tag ); - size_t remaining; - size_t option_len; - size_t payload_len; - - /* Scan through NDP options for requested type. We can assume - * that the options are well-formed, otherwise they would have - * been rejected prior to being stored. - */ - option = ndpset->option; - remaining = ndpset->len; - while ( remaining ) { - - /* Calculate option length */ - option_len = ( option->header.blocks * NDP_OPTION_BLKSZ ); - - /* If this is the requested option, return it */ - if ( option->header.type == type ) { - - /* Sanity check */ - if ( offset > option_len ) { - DBGC ( netdev, "NDP %s option %d too short\n", - netdev->name, type ); - return -EINVAL; - } - payload_len = ( option_len - offset ); - - /* Copy data to output buffer */ - if ( len > payload_len ) - len = payload_len; - memcpy ( data, ( ( ( void * ) option ) + offset ), len); - return payload_len; - } - - /* Move to next option */ - option = ( ( ( void * ) option ) + option_len ); - remaining -= option_len; - } - - return -ENOENT; -} - -/** NDP settings operations */ -static struct settings_operations ndp_settings_operations = { - .applies = ndp_applies, - .fetch = ndp_fetch, -}; - -/** - * Register NDP settings - * - * @v netdev Network device - * @v option NDP options - * @v len Length of options - * @ret rc Return status code - */ -static int ndp_register_settings ( struct net_device *netdev, - union ndp_option *option, size_t len ) { - struct settings *parent = netdev_settings ( netdev ); - struct ndp_settings *ndpset; - int rc; - - /* Allocate and initialise structure */ - ndpset = zalloc ( sizeof ( *ndpset ) + len ); - if ( ! ndpset ) { - rc = -ENOMEM; - goto err_alloc; - } - ref_init ( &ndpset->refcnt, NULL ); - settings_init ( &ndpset->settings, &ndp_settings_operations, - &ndpset->refcnt, &ndp_settings_scope ); - ndpset->len = len; - memcpy ( ndpset->option, option, len ); - - /* Register settings */ - if ( ( rc = register_settings ( &ndpset->settings, parent, - NDP_SETTINGS_NAME ) ) != 0 ) - goto err_register; - - err_register: - ref_put ( &ndpset->refcnt ); - err_alloc: - return rc; -} - -/** DNS server setting */ -const struct setting ndp_dns6_setting __setting ( SETTING_IP_EXTRA, dns6 ) = { - .name = "dns6", - .description = "DNS server", - .tag = NDP_TAG ( NDP_OPT_RDNSS, - offsetof ( struct ndp_rdnss_option, addresses ) ), - .type = &setting_type_ipv6, - .scope = &ndp_settings_scope, -}; - -/** DNS search list setting */ -const struct setting ndp_dnssl_setting __setting ( SETTING_IP_EXTRA, dnssl ) = { - .name = "dnssl", - .description = "DNS search list", - .tag = NDP_TAG ( NDP_OPT_DNSSL, - offsetof ( struct ndp_dnssl_option, names ) ), - .type = &setting_type_dnssl, - .scope = &ndp_settings_scope, -}; - -/**************************************************************************** - * - * IPv6 autoconfiguration - * - */ - -/** An IPv6 configurator */ -struct ipv6conf { - /** Reference count */ - struct refcnt refcnt; - /** List of configurators */ - struct list_head list; - - /** Job control interface */ - struct interface job; - /** DHCPv6 interface */ - struct interface dhcp; - - /** Network device being configured */ - struct net_device *netdev; - - /** Retransmission timer */ - struct retry_timer timer; -}; - -/** List of IPv6 configurators */ -static LIST_HEAD ( ipv6confs ); - -/** - * Free IPv6 configurator - * - * @v refcnt Reference count - */ -static void ipv6conf_free ( struct refcnt *refcnt ) { - struct ipv6conf *ipv6conf = - container_of ( refcnt, struct ipv6conf, refcnt ); - - netdev_put ( ipv6conf->netdev ); - free ( ipv6conf ); -} - -/** - * Identify IPv6 configurator by network device - * - * @v netdev Network device - * @ret ipv6 IPv6 configurator, or NULL - */ -static struct ipv6conf * ipv6conf_demux ( struct net_device *netdev ) { - struct ipv6conf *ipv6conf; - - list_for_each_entry ( ipv6conf, &ipv6confs, list ) { - if ( ipv6conf->netdev == netdev ) - return ipv6conf; - } - return NULL; -} - -/** - * Finish IPv6 autoconfiguration - * - * @v ipv6 IPv6 configurator - * @v rc Reason for finishing - */ -static void ipv6conf_done ( struct ipv6conf *ipv6conf, int rc ) { - - /* Shut down interfaces */ - intf_shutdown ( &ipv6conf->job, rc ); - intf_shutdown ( &ipv6conf->dhcp, rc ); - - /* Stop timer */ - stop_timer ( &ipv6conf->timer ); - - /* Remove from list and drop list's reference */ - list_del ( &ipv6conf->list ); - ref_put ( &ipv6conf->refcnt ); -} - -/** - * Handle IPv6 configurator timer expiry - * - * @v timer Retry timer - * @v fail Failure indicator - */ -static void ipv6conf_expired ( struct retry_timer *timer, int fail ) { - struct ipv6conf *ipv6conf = - container_of ( timer, struct ipv6conf, timer ); - - /* If we have failed, terminate autoconfiguration */ - if ( fail ) { - ipv6conf_done ( ipv6conf, -ETIMEDOUT ); - return; - } - - /* Otherwise, transmit router solicitation and restart timer */ - start_timer ( &ipv6conf->timer ); - ndp_tx_router_solicitation ( ipv6conf->netdev ); -} - -/** - * Handle router advertisement during IPv6 autoconfiguration - * - * @v netdev Network device - * @v radv Router advertisement - * @v len Length of router advertisement - * @ret rc Return status code - * - * This function assumes that the router advertisement is well-formed, - * since it must have already passed through option processing. - */ -static int -ipv6conf_rx_router_advertisement ( struct net_device *netdev, - struct ndp_router_advertisement_header *radv, - size_t len ) { - struct ipv6conf *ipv6conf; - size_t option_len; - int stateful; - int rc; - - /* Identify IPv6 configurator, if any */ - ipv6conf = ipv6conf_demux ( netdev ); - if ( ! ipv6conf ) { - /* Not an error; router advertisements are processed - * as a background activity even when no explicit - * autoconfiguration is taking place. - */ - return 0; - } - - /* If this is not the first solicited router advertisement, ignore it */ - if ( ! timer_running ( &ipv6conf->timer ) ) - return 0; - - /* Stop router solicitation timer */ - stop_timer ( &ipv6conf->timer ); - - /* Register NDP settings */ - option_len = ( len - offsetof ( typeof ( *radv ), option ) ); - if ( ( rc = ndp_register_settings ( netdev, radv->option, - option_len ) ) != 0 ) - return rc; - - /* Start DHCPv6 if required */ - if ( radv->flags & ( NDP_ROUTER_MANAGED | NDP_ROUTER_OTHER ) ) { - stateful = ( radv->flags & NDP_ROUTER_MANAGED ); - if ( ( rc = start_dhcpv6 ( &ipv6conf->dhcp, netdev, - stateful ) ) != 0 ) { - 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; - } - return 0; - } - - /* Otherwise, terminate autoconfiguration */ - ipv6conf_done ( ipv6conf, 0 ); - - return 0; -} - -/** IPv6 configurator job interface operations */ -static struct interface_operation ipv6conf_job_op[] = { - INTF_OP ( intf_close, struct ipv6conf *, ipv6conf_done ), -}; - -/** IPv6 configurator job interface descriptor */ -static struct interface_descriptor ipv6conf_job_desc = - INTF_DESC ( struct ipv6conf, job, ipv6conf_job_op ); - -/** IPv6 configurator DHCPv6 interface operations */ -static struct interface_operation ipv6conf_dhcp_op[] = { - INTF_OP ( intf_close, struct ipv6conf *, ipv6conf_done ), -}; - -/** IPv6 configurator DHCPv6 interface descriptor */ -static struct interface_descriptor ipv6conf_dhcp_desc = - INTF_DESC ( struct ipv6conf, dhcp, ipv6conf_dhcp_op ); - -/** - * Start IPv6 autoconfiguration - * - * @v job Job control interface - * @v netdev Network device - * @ret rc Return status code - */ -int start_ipv6conf ( struct interface *job, struct net_device *netdev ) { - struct ipv6conf *ipv6conf; - - /* Allocate and initialise structure */ - ipv6conf = zalloc ( sizeof ( *ipv6conf ) ); - if ( ! ipv6conf ) - return -ENOMEM; - ref_init ( &ipv6conf->refcnt, ipv6conf_free ); - intf_init ( &ipv6conf->job, &ipv6conf_job_desc, &ipv6conf->refcnt ); - intf_init ( &ipv6conf->dhcp, &ipv6conf_dhcp_desc, &ipv6conf->refcnt ); - timer_init ( &ipv6conf->timer, ipv6conf_expired, &ipv6conf->refcnt ); - ipv6conf->netdev = netdev_get ( netdev ); - - /* Start timer to initiate router solicitation */ - start_timer_nodelay ( &ipv6conf->timer ); - - /* Attach parent interface, transfer reference to list, and return */ - intf_plug_plug ( &ipv6conf->job, job ); - list_add ( &ipv6conf->list, &ipv6confs ); - return 0; -} - -/** IPv6 network device configurator */ -struct net_device_configurator ipv6_configurator __net_device_configurator = { - .name = "ipv6", - .start = start_ipv6conf, -}; |