Simon Kelley | d1ced3a | 2018-01-01 22:18:03 +0000 | [diff] [blame] | 1 | /* dnsmasq is Copyright (c) 2000-2018 Simon Kelley |
Simon Kelley | 353ae4d | 2012-03-19 20:07:51 +0000 | [diff] [blame] | 2 | |
| 3 | This program is free software; you can redistribute it and/or modify |
| 4 | it under the terms of the GNU General Public License as published by |
| 5 | the Free Software Foundation; version 2 dated June, 1991, or |
| 6 | (at your option) version 3 dated 29 June, 2007. |
| 7 | |
| 8 | This program is distributed in the hope that it will be useful, |
| 9 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | GNU General Public License for more details. |
| 12 | |
| 13 | You should have received a copy of the GNU General Public License |
| 14 | along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 15 | */ |
| 16 | |
| 17 | #include "dnsmasq.h" |
| 18 | |
| 19 | #ifdef HAVE_DHCP6 |
| 20 | |
| 21 | #include <netinet/icmp6.h> |
| 22 | |
Simon Kelley | 353ae4d | 2012-03-19 20:07:51 +0000 | [diff] [blame] | 23 | static int ping_id = 0; |
| 24 | |
Simon Kelley | a9ab732 | 2012-04-28 11:29:37 +0100 | [diff] [blame] | 25 | void slaac_add_addrs(struct dhcp_lease *lease, time_t now, int force) |
Simon Kelley | 353ae4d | 2012-03-19 20:07:51 +0000 | [diff] [blame] | 26 | { |
| 27 | struct slaac_address *slaac, *old, **up; |
| 28 | struct dhcp_context *context; |
Simon Kelley | 7f61b3a | 2012-04-28 17:42:31 +0100 | [diff] [blame] | 29 | int dns_dirty = 0; |
Simon Kelley | 353ae4d | 2012-03-19 20:07:51 +0000 | [diff] [blame] | 30 | |
| 31 | if (!(lease->flags & LEASE_HAVE_HWADDR) || |
Simon Kelley | a9ab732 | 2012-04-28 11:29:37 +0100 | [diff] [blame] | 32 | (lease->flags & (LEASE_TA | LEASE_NA)) || |
Simon Kelley | 353ae4d | 2012-03-19 20:07:51 +0000 | [diff] [blame] | 33 | lease->last_interface == 0 || |
| 34 | !lease->hostname) |
| 35 | return ; |
| 36 | |
| 37 | old = lease->slaac_address; |
| 38 | lease->slaac_address = NULL; |
| 39 | |
Simon Kelley | 1f77693 | 2012-12-16 19:46:08 +0000 | [diff] [blame] | 40 | for (context = daemon->dhcp6; context; context = context->next) |
Simon Kelley | ef1a94a | 2013-07-26 13:59:03 +0100 | [diff] [blame] | 41 | if ((context->flags & CONTEXT_RA_NAME) && |
| 42 | !(context->flags & CONTEXT_OLD) && |
| 43 | lease->last_interface == context->if_index) |
Simon Kelley | 353ae4d | 2012-03-19 20:07:51 +0000 | [diff] [blame] | 44 | { |
| 45 | struct in6_addr addr = context->start6; |
| 46 | if (lease->hwaddr_len == 6 && |
| 47 | (lease->hwaddr_type == ARPHRD_ETHER || lease->hwaddr_type == ARPHRD_IEEE802)) |
| 48 | { |
| 49 | /* convert MAC address to EUI-64 */ |
| 50 | memcpy(&addr.s6_addr[8], lease->hwaddr, 3); |
| 51 | memcpy(&addr.s6_addr[13], &lease->hwaddr[3], 3); |
| 52 | addr.s6_addr[11] = 0xff; |
| 53 | addr.s6_addr[12] = 0xfe; |
| 54 | } |
| 55 | #if defined(ARPHRD_EUI64) |
| 56 | else if (lease->hwaddr_len == 8 && |
| 57 | lease->hwaddr_type == ARPHRD_EUI64) |
| 58 | memcpy(&addr.s6_addr[8], lease->hwaddr, 8); |
| 59 | #endif |
| 60 | #if defined(ARPHRD_IEEE1394) && defined(ARPHRD_EUI64) |
| 61 | else if (lease->clid_len == 9 && |
| 62 | lease->clid[0] == ARPHRD_EUI64 && |
| 63 | lease->hwaddr_type == ARPHRD_IEEE1394) |
| 64 | /* firewire has EUI-64 identifier as clid */ |
| 65 | memcpy(&addr.s6_addr[8], &lease->clid[1], 8); |
| 66 | #endif |
| 67 | else |
| 68 | continue; |
| 69 | |
| 70 | addr.s6_addr[8] ^= 0x02; |
| 71 | |
| 72 | /* check if we already have this one */ |
| 73 | for (up = &old, slaac = old; slaac; slaac = slaac->next) |
| 74 | { |
| 75 | if (IN6_ARE_ADDR_EQUAL(&addr, &slaac->addr)) |
| 76 | { |
| 77 | *up = slaac->next; |
Simon Kelley | a9ab732 | 2012-04-28 11:29:37 +0100 | [diff] [blame] | 78 | /* recheck when DHCPv4 goes through init-reboot */ |
| 79 | if (force) |
| 80 | { |
| 81 | slaac->ping_time = now; |
| 82 | slaac->backoff = 1; |
Simon Kelley | 7f61b3a | 2012-04-28 17:42:31 +0100 | [diff] [blame] | 83 | dns_dirty = 1; |
Simon Kelley | a9ab732 | 2012-04-28 11:29:37 +0100 | [diff] [blame] | 84 | } |
Simon Kelley | 353ae4d | 2012-03-19 20:07:51 +0000 | [diff] [blame] | 85 | break; |
| 86 | } |
| 87 | up = &slaac->next; |
| 88 | } |
| 89 | |
| 90 | /* No, make new one */ |
| 91 | if (!slaac && (slaac = whine_malloc(sizeof(struct slaac_address)))) |
| 92 | { |
| 93 | slaac->ping_time = now; |
| 94 | slaac->backoff = 1; |
| 95 | slaac->addr = addr; |
Simon Kelley | 353ae4d | 2012-03-19 20:07:51 +0000 | [diff] [blame] | 96 | /* Do RA's to prod it */ |
Josh Soref | 730c674 | 2017-02-06 16:14:04 +0000 | [diff] [blame] | 97 | ra_start_unsolicited(now, context); |
Simon Kelley | 353ae4d | 2012-03-19 20:07:51 +0000 | [diff] [blame] | 98 | } |
| 99 | |
| 100 | if (slaac) |
| 101 | { |
| 102 | slaac->next = lease->slaac_address; |
| 103 | lease->slaac_address = slaac; |
| 104 | } |
| 105 | } |
| 106 | |
Simon Kelley | 7f61b3a | 2012-04-28 17:42:31 +0100 | [diff] [blame] | 107 | if (old || dns_dirty) |
| 108 | lease_update_dns(1); |
| 109 | |
Simon Kelley | 353ae4d | 2012-03-19 20:07:51 +0000 | [diff] [blame] | 110 | /* Free any no reused */ |
| 111 | for (; old; old = slaac) |
| 112 | { |
| 113 | slaac = old->next; |
| 114 | free(old); |
| 115 | } |
| 116 | } |
| 117 | |
| 118 | |
| 119 | time_t periodic_slaac(time_t now, struct dhcp_lease *leases) |
| 120 | { |
| 121 | struct dhcp_context *context; |
| 122 | struct dhcp_lease *lease; |
Simon Kelley | 89382ba | 2012-04-04 20:48:16 +0100 | [diff] [blame] | 123 | struct slaac_address *slaac; |
| 124 | time_t next_event = 0; |
Simon Kelley | 353ae4d | 2012-03-19 20:07:51 +0000 | [diff] [blame] | 125 | |
Simon Kelley | 1f77693 | 2012-12-16 19:46:08 +0000 | [diff] [blame] | 126 | for (context = daemon->dhcp6; context; context = context->next) |
Simon Kelley | ef1a94a | 2013-07-26 13:59:03 +0100 | [diff] [blame] | 127 | if ((context->flags & CONTEXT_RA_NAME) && !(context->flags & CONTEXT_OLD)) |
Simon Kelley | 353ae4d | 2012-03-19 20:07:51 +0000 | [diff] [blame] | 128 | break; |
| 129 | |
| 130 | /* nothing configured */ |
| 131 | if (!context) |
| 132 | return 0; |
| 133 | |
| 134 | while (ping_id == 0) |
| 135 | ping_id = rand16(); |
| 136 | |
Simon Kelley | 353ae4d | 2012-03-19 20:07:51 +0000 | [diff] [blame] | 137 | for (lease = leases; lease; lease = lease->next) |
| 138 | for (slaac = lease->slaac_address; slaac; slaac = slaac->next) |
| 139 | { |
Simon Kelley | 29689cf | 2012-03-22 14:01:00 +0000 | [diff] [blame] | 140 | /* confirmed or given up? */ |
| 141 | if (slaac->backoff == 0 || slaac->ping_time == 0) |
Simon Kelley | 353ae4d | 2012-03-19 20:07:51 +0000 | [diff] [blame] | 142 | continue; |
| 143 | |
| 144 | if (difftime(slaac->ping_time, now) <= 0.0) |
| 145 | { |
| 146 | struct ping_packet *ping; |
| 147 | struct sockaddr_in6 addr; |
Simon Kelley | 89382ba | 2012-04-04 20:48:16 +0100 | [diff] [blame] | 148 | |
Simon Kelley | fa78573 | 2016-07-22 20:56:01 +0100 | [diff] [blame] | 149 | reset_counter(); |
Simon Kelley | ce7845b | 2016-07-06 21:42:27 +0100 | [diff] [blame] | 150 | |
| 151 | if (!(ping = expand(sizeof(struct ping_packet)))) |
| 152 | continue; |
| 153 | |
Simon Kelley | 353ae4d | 2012-03-19 20:07:51 +0000 | [diff] [blame] | 154 | ping->type = ICMP6_ECHO_REQUEST; |
| 155 | ping->code = 0; |
| 156 | ping->identifier = ping_id; |
| 157 | ping->sequence_no = slaac->backoff; |
| 158 | |
| 159 | memset(&addr, 0, sizeof(addr)); |
| 160 | #ifdef HAVE_SOCKADDR_SA_LEN |
| 161 | addr.sin6_len = sizeof(struct sockaddr_in6); |
| 162 | #endif |
| 163 | addr.sin6_family = AF_INET6; |
| 164 | addr.sin6_port = htons(IPPROTO_ICMPV6); |
| 165 | addr.sin6_addr = slaac->addr; |
| 166 | |
Simon Kelley | 6b1c464 | 2016-07-22 20:59:16 +0100 | [diff] [blame] | 167 | if (sendto(daemon->icmp6fd, daemon->outpacket.iov_base, save_counter(-1), 0, |
Simon Kelley | 89382ba | 2012-04-04 20:48:16 +0100 | [diff] [blame] | 168 | (struct sockaddr *)&addr, sizeof(addr)) == -1 && |
| 169 | errno == EHOSTUNREACH) |
Simon Kelley | 50303b1 | 2012-04-04 22:13:17 +0100 | [diff] [blame] | 170 | slaac->ping_time = 0; /* Give up */ |
Simon Kelley | 89382ba | 2012-04-04 20:48:16 +0100 | [diff] [blame] | 171 | else |
Simon Kelley | 29689cf | 2012-03-22 14:01:00 +0000 | [diff] [blame] | 172 | { |
| 173 | slaac->ping_time += (1 << (slaac->backoff - 1)) + (rand16()/21785); /* 0 - 3 */ |
| 174 | if (slaac->backoff > 4) |
| 175 | slaac->ping_time += rand16()/4000; /* 0 - 15 */ |
| 176 | if (slaac->backoff < 12) |
| 177 | slaac->backoff++; |
| 178 | } |
Simon Kelley | 353ae4d | 2012-03-19 20:07:51 +0000 | [diff] [blame] | 179 | } |
| 180 | |
Simon Kelley | 29689cf | 2012-03-22 14:01:00 +0000 | [diff] [blame] | 181 | if (slaac->ping_time != 0 && |
| 182 | (next_event == 0 || difftime(next_event, slaac->ping_time) >= 0.0)) |
Simon Kelley | 353ae4d | 2012-03-19 20:07:51 +0000 | [diff] [blame] | 183 | next_event = slaac->ping_time; |
| 184 | } |
| 185 | |
| 186 | return next_event; |
| 187 | } |
| 188 | |
| 189 | |
| 190 | void slaac_ping_reply(struct in6_addr *sender, unsigned char *packet, char *interface, struct dhcp_lease *leases) |
| 191 | { |
| 192 | struct dhcp_lease *lease; |
| 193 | struct slaac_address *slaac; |
| 194 | struct ping_packet *ping = (struct ping_packet *)packet; |
| 195 | int gotone = 0; |
| 196 | |
| 197 | if (ping->identifier == ping_id) |
| 198 | for (lease = leases; lease; lease = lease->next) |
| 199 | for (slaac = lease->slaac_address; slaac; slaac = slaac->next) |
| 200 | if (slaac->backoff != 0 && IN6_ARE_ADDR_EQUAL(sender, &slaac->addr)) |
| 201 | { |
| 202 | slaac->backoff = 0; |
| 203 | gotone = 1; |
| 204 | inet_ntop(AF_INET6, sender, daemon->addrbuff, ADDRSTRLEN); |
Kevin Darbyshire-Bryant | 8c0b73d | 2013-10-11 11:56:33 +0100 | [diff] [blame] | 205 | if (!option_bool(OPT_QUIET_DHCP6)) |
| 206 | my_syslog(MS_DHCP | LOG_INFO, "SLAAC-CONFIRM(%s) %s %s", interface, daemon->addrbuff, lease->hostname); |
Simon Kelley | 353ae4d | 2012-03-19 20:07:51 +0000 | [diff] [blame] | 207 | } |
| 208 | |
| 209 | lease_update_dns(gotone); |
| 210 | } |
| 211 | |
Simon Kelley | 353ae4d | 2012-03-19 20:07:51 +0000 | [diff] [blame] | 212 | #endif |