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[fd00::} and [fe80::] special addresses in DHCPv6 options.

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This commit is contained in:
Simon Kelley
2014-01-11 22:18:19 +00:00
parent ae76242fdf
commit c3a04081ff
7 changed files with 194 additions and 57 deletions
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108
src/radv.c
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@@ -31,8 +31,8 @@ struct ra_param {
int ind, managed, other, found_context, first;
char *if_name;
struct dhcp_netid *tags;
struct in6_addr link_local, link_global;
unsigned int pref_time, adv_interval;
struct in6_addr link_local, link_global, ula;
unsigned int glob_pref_time, link_pref_time, ula_pref_time, adv_interval;
};
struct search_param {
@@ -206,6 +206,7 @@ static void send_ra(time_t now, int iface, char *iface_name, struct in6_addr *de
struct dhcp_opt *opt_cfg;
struct ra_interface *ra_param = find_iface_param(iface_name);
int done_dns = 0, old_prefix = 0;
unsigned int min_pref_time;
#ifdef HAVE_LINUX_NETWORK
FILE *f;
#endif
@@ -228,7 +229,7 @@ static void send_ra(time_t now, int iface, char *iface_name, struct in6_addr *de
parm.if_name = iface_name;
parm.first = 1;
parm.now = now;
parm.pref_time = 0;
parm.glob_pref_time = parm.link_pref_time = parm.ula_pref_time = 0;
parm.adv_interval = calc_interval(ra_param);
/* set tag with name == interface */
@@ -245,6 +246,18 @@ static void send_ra(time_t now, int iface, char *iface_name, struct in6_addr *de
if (!iface_enumerate(AF_INET6, &parm, add_prefixes))
return;
/* Find smallest preferred time within address classes,
to use as lifetime for options. This is a rather arbitrary choice. */
min_pref_time = 0xffffffff;
if (parm.glob_pref_time != 0 && parm.glob_pref_time < min_pref_time)
min_pref_time = parm.glob_pref_time;
if (parm.ula_pref_time != 0 && parm.ula_pref_time < min_pref_time)
min_pref_time = parm.ula_pref_time;
if (parm.link_pref_time != 0 && parm.link_pref_time < min_pref_time)
min_pref_time = parm.link_pref_time;
/* Look for constructed contexts associated with addresses which have gone,
and advertise them with preferred_time == 0 RFC 6204 4.3 L-13 */
for (up = &daemon->dhcp6, context = daemon->dhcp6; context; context = tmp)
@@ -340,22 +353,48 @@ static void send_ra(time_t now, int iface, char *iface_name, struct in6_addr *de
if (opt_cfg->opt == OPTION6_DNS_SERVER)
{
struct in6_addr *a = (struct in6_addr *)opt_cfg->val;
struct in6_addr *a;
int len;
done_dns = 1;
if (opt_cfg->len == 0 || (IN6_IS_ADDR_UNSPECIFIED(a) && parm.pref_time == 0))
if (opt_cfg->len == 0)
continue;
put_opt6_char(ICMP6_OPT_RDNSS);
put_opt6_char((opt_cfg->len/8) + 1);
put_opt6_short(0);
put_opt6_long(parm.pref_time);
/* zero means "self" */
for (i = 0; i < opt_cfg->len; i += IN6ADDRSZ, a++)
if (IN6_IS_ADDR_UNSPECIFIED(a))
put_opt6(&parm.link_global, IN6ADDRSZ);
else
put_opt6(a, IN6ADDRSZ);
/* reduce len for any addresses we can't substitute */
for (a = (struct in6_addr *)opt_cfg->val, len = opt_cfg->len, i = 0;
i < opt_cfg->len; i += IN6ADDRSZ, a++)
if ((IN6_IS_ADDR_UNSPECIFIED(a) && parm.glob_pref_time == 0) ||
(IN6_IS_ADDR_ULA_ZERO(a) && parm.ula_pref_time == 0) ||
(IN6_IS_ADDR_LINK_LOCAL_ZERO(a) && parm.link_pref_time == 0))
len -= IN6ADDRSZ;
if (len != 0)
{
put_opt6_char(ICMP6_OPT_RDNSS);
put_opt6_char((len/8) + 1);
put_opt6_short(0);
put_opt6_long(min_pref_time);
for (a = (struct in6_addr *)opt_cfg->val, i = 0; i < opt_cfg->len; i += IN6ADDRSZ, a++)
if (IN6_IS_ADDR_UNSPECIFIED(a))
{
if (parm.glob_pref_time != 0)
put_opt6(&parm.link_global, IN6ADDRSZ);
}
else if (IN6_IS_ADDR_ULA_ZERO(a))
{
if (parm.ula_pref_time != 0)
put_opt6(&parm.ula, IN6ADDRSZ);
}
else if (IN6_IS_ADDR_LINK_LOCAL_ZERO(a))
{
if (parm.link_pref_time != 0)
put_opt6(&parm.link_local, IN6ADDRSZ);
}
else
put_opt6(a, IN6ADDRSZ);
}
}
if (opt_cfg->opt == OPTION6_DOMAIN_SEARCH && opt_cfg->len != 0)
@@ -365,7 +404,7 @@ static void send_ra(time_t now, int iface, char *iface_name, struct in6_addr *de
put_opt6_char(ICMP6_OPT_DNSSL);
put_opt6_char(len + 1);
put_opt6_short(0);
put_opt6_long(parm.pref_time);
put_opt6_long(min_pref_time);
put_opt6(opt_cfg->val, opt_cfg->len);
/* pad */
@@ -374,13 +413,13 @@ static void send_ra(time_t now, int iface, char *iface_name, struct in6_addr *de
}
}
if (daemon->port == NAMESERVER_PORT && !done_dns && parm.pref_time != 0)
if (daemon->port == NAMESERVER_PORT && !done_dns && parm.link_pref_time != 0)
{
/* default == us, as long as we are supplying DNS service. */
put_opt6_char(ICMP6_OPT_RDNSS);
put_opt6_char(3);
put_opt6_short(0);
put_opt6_long(parm.pref_time);
put_opt6_long(min_pref_time);
put_opt6(&parm.link_local, IN6ADDRSZ);
}
@@ -426,7 +465,16 @@ static int add_prefixes(struct in6_addr *local, int prefix,
if (if_index == param->ind)
{
if (IN6_IS_ADDR_LINKLOCAL(local))
param->link_local = *local;
{
/* Can there be more than one LL address?
Select the one with the longest preferred time
if there is. */
if (preferred > param->link_pref_time)
{
param->link_pref_time = preferred;
param->link_local = *local;
}
}
else if (!IN6_IS_ADDR_LOOPBACK(local) &&
!IN6_IS_ADDR_MULTICAST(local))
{
@@ -516,11 +564,22 @@ static int add_prefixes(struct in6_addr *local, int prefix,
/* configured time is ceiling */
if (!constructed || preferred > time)
preferred = time;
if (preferred > param->pref_time)
if (IN6_IS_ADDR_ULA(local))
{
param->pref_time = preferred;
param->link_global = *local;
if (preferred > param->ula_pref_time)
{
param->ula_pref_time = preferred;
param->ula = *local;
}
}
else
{
if (preferred > param->glob_pref_time)
{
param->glob_pref_time = preferred;
param->link_global = *local;
}
}
if (real_prefix != 0)
@@ -546,7 +605,6 @@ static int add_prefixes(struct in6_addr *local, int prefix,
if (!option_bool(OPT_QUIET_RA))
my_syslog(MS_DHCP | LOG_INFO, "RTR-ADVERT(%s) %s", param->if_name, daemon->addrbuff);
}
}
}
}