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/* dnsmasq is Copyright (c) 2000-2020 Simon Kelley
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; version 2 dated June, 1991, or
(at your option) version 3 dated 29 June, 2007.
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, see <http://www.gnu.org/licenses/>.
*/
#include "dnsmasq.h"
#ifdef HAVE_DHCP6
#include <netinet/icmp6.h>
static int ping_id = 0;
void slaac_add_addrs(struct dhcp_lease *lease, time_t now, int force)
{
struct slaac_address *slaac, *old, **up;
struct dhcp_context *context;
int dns_dirty = 0;
if (!(lease->flags & LEASE_HAVE_HWADDR) ||
(lease->flags & (LEASE_TA | LEASE_NA)) ||
lease->last_interface == 0 ||
!lease->hostname)
return ;
old = lease->slaac_address;
lease->slaac_address = NULL;
for (context = daemon->dhcp6; context; context = context->next)
if ((context->flags & CONTEXT_RA_NAME) &&
!(context->flags & CONTEXT_OLD) &&
lease->last_interface == context->if_index)
{
struct in6_addr addr = context->start6;
if (lease->hwaddr_len == 6 &&
(lease->hwaddr_type == ARPHRD_ETHER || lease->hwaddr_type == ARPHRD_IEEE802))
{
/* convert MAC address to EUI-64 */
memcpy(&addr.s6_addr[8], lease->hwaddr, 3);
memcpy(&addr.s6_addr[13], &lease->hwaddr[3], 3);
addr.s6_addr[11] = 0xff;
addr.s6_addr[12] = 0xfe;
}
#if defined(ARPHRD_EUI64)
else if (lease->hwaddr_len == 8 &&
lease->hwaddr_type == ARPHRD_EUI64)
memcpy(&addr.s6_addr[8], lease->hwaddr, 8);
#endif
#if defined(ARPHRD_IEEE1394) && defined(ARPHRD_EUI64)
else if (lease->clid_len == 9 &&
lease->clid[0] == ARPHRD_EUI64 &&
lease->hwaddr_type == ARPHRD_IEEE1394)
/* firewire has EUI-64 identifier as clid */
memcpy(&addr.s6_addr[8], &lease->clid[1], 8);
#endif
else
continue;
addr.s6_addr[8] ^= 0x02;
/* check if we already have this one */
for (up = &old, slaac = old; slaac; slaac = slaac->next)
{
if (IN6_ARE_ADDR_EQUAL(&addr, &slaac->addr))
{
*up = slaac->next;
/* recheck when DHCPv4 goes through init-reboot */
if (force)
{
slaac->ping_time = now;
slaac->backoff = 1;
dns_dirty = 1;
}
break;
}
up = &slaac->next;
}
/* No, make new one */
if (!slaac && (slaac = whine_malloc(sizeof(struct slaac_address))))
{
slaac->ping_time = now;
slaac->backoff = 1;
slaac->addr = addr;
/* Do RA's to prod it */
ra_start_unsolicited(now, context);
}
if (slaac)
{
slaac->next = lease->slaac_address;
lease->slaac_address = slaac;
}
}
if (old || dns_dirty)
lease_update_dns(1);
/* Free any no reused */
for (; old; old = slaac)
{
slaac = old->next;
free(old);
}
}
time_t periodic_slaac(time_t now, struct dhcp_lease *leases)
{
struct dhcp_context *context;
struct dhcp_lease *lease;
struct slaac_address *slaac;
time_t next_event = 0;
for (context = daemon->dhcp6; context; context = context->next)
if ((context->flags & CONTEXT_RA_NAME) && !(context->flags & CONTEXT_OLD))
break;
/* nothing configured */
if (!context)
return 0;
while (ping_id == 0)
ping_id = rand16();
for (lease = leases; lease; lease = lease->next)
for (slaac = lease->slaac_address; slaac; slaac = slaac->next)
{
/* confirmed or given up? */
if (slaac->backoff == 0 || slaac->ping_time == 0)
continue;
if (difftime(slaac->ping_time, now) <= 0.0)
{
struct ping_packet *ping;
struct sockaddr_in6 addr;
reset_counter();
if (!(ping = expand(sizeof(struct ping_packet))))
continue;
ping->type = ICMP6_ECHO_REQUEST;
ping->code = 0;
ping->identifier = ping_id;
ping->sequence_no = slaac->backoff;
memset(&addr, 0, sizeof(addr));
#ifdef HAVE_SOCKADDR_SA_LEN
addr.sin6_len = sizeof(struct sockaddr_in6);
#endif
addr.sin6_family = AF_INET6;
addr.sin6_port = htons(IPPROTO_ICMPV6);
addr.sin6_addr = slaac->addr;
if (sendto(daemon->icmp6fd, daemon->outpacket.iov_base, save_counter(-1), 0,
(struct sockaddr *)&addr, sizeof(addr)) == -1 &&
errno == EHOSTUNREACH &&
slaac->backoff == 12)
slaac->ping_time = 0; /* Give up */
else
{
slaac->ping_time += (1 << (slaac->backoff - 1)) + (rand16()/21785); /* 0 - 3 */
if (slaac->backoff > 4)
slaac->ping_time += rand16()/4000; /* 0 - 15 */
if (slaac->backoff < 12)
slaac->backoff++;
}
}
if (slaac->ping_time != 0 &&
(next_event == 0 || difftime(next_event, slaac->ping_time) >= 0.0))
next_event = slaac->ping_time;
}
return next_event;
}
void slaac_ping_reply(struct in6_addr *sender, unsigned char *packet, char *interface, struct dhcp_lease *leases)
{
struct dhcp_lease *lease;
struct slaac_address *slaac;
struct ping_packet *ping = (struct ping_packet *)packet;
int gotone = 0;
if (ping->identifier == ping_id)
for (lease = leases; lease; lease = lease->next)
for (slaac = lease->slaac_address; slaac; slaac = slaac->next)
if (slaac->backoff != 0 && IN6_ARE_ADDR_EQUAL(sender, &slaac->addr))
{
slaac->backoff = 0;
gotone = 1;
inet_ntop(AF_INET6, sender, daemon->addrbuff, ADDRSTRLEN);
if (!option_bool(OPT_QUIET_DHCP6))
my_syslog(MS_DHCP | LOG_INFO, "SLAAC-CONFIRM(%s) %s %s", interface, daemon->addrbuff, lease->hostname);
}
lease_update_dns(gotone);
}
#endif
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