src/usr/ip6mgmt.c

   1 /*
   2  * Copyright (C) 2011 Matthew Iselin <matthew@theiselins.net>.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 of the
   7  * License, or any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  */
  18
  19 FILE_LICENCE ( GPL2_OR_LATER );
  20
  21 #include <string.h>
  22 #include <stdio.h>
  23 #include <errno.h>
  24 #include <gpxe/netdevice.h>
  25 #include <gpxe/in.h>
  26 #include <gpxe/ip6.h>
  27 #include <gpxe/icmp6.h>
  28 #include <gpxe/monojob.h>
  29 #include <gpxe/process.h>
  30 #include <gpxe/ndp.h>
  31 #include <usr/ifmgmt.h>
  32 #include <usr/ip6mgmt.h>
  33 #include <gpxe/dhcp6.h>
  34
  35 #define LINK_WAIT_MS    15000
  36
  37 /* Maximum length of the link-layer address we'll insert as an EUI-64. */
  38 #define AUTOCONF_LL_MAX 6
  39
  40 int ip6_autoconf ( struct net_device *netdev ) {
  41         struct in6_addr ip6addr, ip6zero;
  42         size_t ll_size;
  43         int rc;
  44         int use_dhcp = 0, onlyinfo = 0;
  45
  46         /* Check we can open the interface first */
  47         if ( ( rc = ifopen ( netdev ) ) != 0 )
  48                 return rc;
  49
  50         /* Wait for link-up */
  51         if ( ( rc = iflinkwait ( netdev, LINK_WAIT_MS ) ) != 0 )
  52                 return rc;
  53
  54         /* Create the host ID part of the IPv6 address from the Link-Layer
  55          * address on the netdevice. */
  56         memset ( &ip6addr, 0, sizeof (struct in6_addr) );
  57         memset ( &ip6zero, 0, sizeof (struct in6_addr) );
  58
  59         ll_size = netdev->ll_protocol->ll_addr_len;
  60         if ( ll_size < 6 ) {
  61                 memcpy ( ip6addr.s6_addr + (8 - ll_size), netdev->ll_addr, ll_size );
  62         } else {
  63                 ipv6_generate_eui64 ( ip6addr.s6_addr + 8, netdev->ll_addr );
  64         }
  65
  66         /* Fill in the link-local prefix. */
  67         ip6addr.s6_addr[0] = 0xFE;
  68         ip6addr.s6_addr[1] = 0x80;
  69
  70         /* TODO: send a few neighbour solicits on this address before we take
  71          * it (once NDP is implemented). */
  72
  73         DBG ( "ipv6 autoconfig address is %s\n", inet6_ntoa(ip6addr) );
  74
  75         /* Add as a route. It turns out Linux actually uses /64 for these, even
  76          * though they are technically a /10. It does make routing easier, as
  77          * /10 straddles a byte boundary. */
  78         add_ipv6_address ( netdev, ip6addr, 64, ip6addr, ip6zero );
  79
  80         /* Solicit routers on the network. */
  81         struct rsolicit_info router;
  82         if ( ( rc = ndp_send_rsolicit ( netdev, &monojob, &router ) ) == 0 ) {
  83                 rc = monojob_wait ( "finding routers and attempting stateless autoconfiguration" );
  84         }
  85
  86         if ( rc != 0 ) {
  87                 DBG ( "ipv6: router solicitation failed\n" );
  88                 use_dhcp = 1;
  89                 onlyinfo = 0;
  90         } else {
  91                 if ( router.flags & RSOLICIT_CODE_MANAGED ) {
  92                         DBG ( "ipv6: should use dhcp6 server\n" );
  93                         use_dhcp = 1;
  94                 } else if ( router.flags & RSOLICIT_CODE_OTHERCONF ) {
  95                         DBG ( "ipv6: use dhcp6 server for DNS settings\n" );
  96                         use_dhcp = 1;
  97                         onlyinfo = 1;
  98                 } else {
  99                         DBG ( "ipv6: autoconfiguration complete\n" );
 100                 }
 101         }
 102
 103         /* Attempt DHCPv6 now, for addresses (if we don't already have one) and
 104          * DNS configuration. */
 105         if ( use_dhcp ) {
 106                 start_dhcp6 ( &monojob, netdev, onlyinfo, &router );
 107                 rc = monojob_wait ( "dhcp6" );
 108         }
 109
 110         return rc;
 111 }
 112