#include <stdlib.h>
#include <unistd.h>
#include <stdbool.h>
+#include <arpa/inet.h>
#include <net/route.h>
#include "router.h"
static void trigger_router_advert(struct uloop_timeout *event);
static void sigusr1_refresh(int signal);
-static struct odhcpd_event router_event = {{.fd = -1}, handle_icmpv6};
+static struct odhcpd_event router_event = {.uloop = {.fd = -1}, .handle_dgram = handle_icmpv6, };
static FILE *fp_route = NULL;
#define RA_IOV_LEN 6
+#define TIME_LEFT(t1, now) ((t1) != UINT32_MAX ? (t1) - (now) : UINT32_MAX)
int init_router(void)
{
uloop_timeout_cancel(&iface->timer_rs);
iface->timer_rs.cb = NULL;
+ if (iface->ifindex <= 0)
+ return -1;
+
setsockopt(router_event.uloop.fd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP,
&all_nodes, sizeof(all_nodes));
setsockopt(router_event.uloop.fd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP,
forward_router_solicitation(iface);
} else if (iface->ra == RELAYD_SERVER && !iface->master) {
iface->timer_rs.cb = trigger_router_advert;
- trigger_router_advert(&iface->timer_rs);
+ uloop_timeout_set(&iface->timer_rs, 1000);
+ ndp_rqs_addr6_dump();
}
if (iface->ra == RELAYD_RELAY || (iface->ra == RELAYD_SERVER && !iface->master))
return found_default;
}
+static int calc_adv_interval(struct interface *iface, uint32_t minvalid,
+ uint32_t *maxival)
+{
+ uint32_t minival = iface->ra_mininterval;
+ int msecs;
+
+ *maxival = iface->ra_maxinterval;
+
+ if (*maxival > minvalid/3)
+ *maxival = minvalid/3;
+
+ if (*maxival > MaxRtrAdvInterval)
+ *maxival = MaxRtrAdvInterval;
+ else if (*maxival < 4)
+ *maxival = 4;
+
+ if (minival < MinRtrAdvInterval)
+ minival = MinRtrAdvInterval;
+ else if (minival > (*maxival * 3)/4)
+ minival = (*maxival >= 9 ? *maxival/3 : *maxival);
+
+ odhcpd_urandom(&msecs, sizeof(msecs));
+ msecs = (labs(msecs) % ((*maxival != minival) ? (*maxival - minival)*1000 : 500)) +
+ minival*1000;
+
+ return msecs;
+}
+
+static uint16_t calc_ra_lifetime(struct interface *iface, uint32_t maxival)
+{
+ uint16_t lifetime = 3*maxival;
+
+ if (iface->ra_lifetime >= 0) {
+ lifetime = iface->ra_lifetime;
+ if (lifetime < maxival)
+ lifetime = maxival;
+ else if (lifetime > 9000)
+ lifetime = 9000;
+ }
+
+ return lifetime;
+}
+
// Router Advert server mode
static uint64_t send_router_advert(struct interface *iface, const struct in6_addr *from)
{
+ time_t now = odhcpd_time();
int mtu = odhcpd_get_interface_config(iface->ifname, "mtu");
int hlim = odhcpd_get_interface_config(iface->ifname, "hop_limit");
struct nd_router_advert h;
struct icmpv6_opt lladdr;
struct nd_opt_mtu mtu;
- struct nd_opt_prefix_info prefix[RELAYD_MAX_PREFIXES];
+ struct nd_opt_prefix_info prefix[sizeof(iface->ia_addr) / sizeof(*iface->ia_addr)];
} adv = {
.h = {{.icmp6_type = ND_ROUTER_ADVERT, .icmp6_code = 0}, 0, 0},
.lladdr = {ND_OPT_SOURCE_LINKADDR, 1, {0}},
odhcpd_get_mac(iface, adv.lladdr.data);
// If not currently shutting down
- struct odhcpd_ipaddr addrs[RELAYD_MAX_PREFIXES];
+ struct odhcpd_ipaddr addrs[RELAYD_MAX_ADDRS];
ssize_t ipcnt = 0;
- uint64_t minvalid = UINT64_MAX;
- uint64_t maxvalid = 0;
+ uint32_t minvalid = UINT32_MAX;
+ bool default_route = false;
+ bool valid_prefix = false;
// If not shutdown
if (iface->timer_rs.cb) {
- ipcnt = odhcpd_get_interface_addresses(iface->ifindex,
- addrs, ARRAY_SIZE(addrs));
+ ipcnt = iface->ia_addr_len;
+ memcpy(addrs, iface->ia_addr, ipcnt * sizeof(*addrs));
// Check default route
- if (parse_routes(addrs, ipcnt) || iface->default_router > 1)
- adv.h.nd_ra_router_lifetime = 1;
+ if (iface->default_router) {
+ default_route = true;
+
+ if (iface->default_router > 1)
+ valid_prefix = true;
+ } else if (parse_routes(addrs, ipcnt))
+ default_route = true;
}
// Construct Prefix Information options
size_t cnt = 0;
- struct in6_addr dns_pref = IN6ADDR_ANY_INIT, *dns_addr = &dns_pref;
- uint32_t dns_time = 0;
+ struct in6_addr dns_pref, *dns_addr = &dns_pref;
size_t dns_cnt = 1;
+ odhcpd_get_linklocal_interface_address(iface->ifindex, &dns_pref);
+
for (ssize_t i = 0; i < ipcnt; ++i) {
struct odhcpd_ipaddr *addr = &addrs[i];
- if (addr->prefix > 96)
- continue; // Address not suitable
+ uint32_t preferred = 0;
+ uint32_t valid = 0;
- if (addr->preferred > MaxValidTime)
- addr->preferred = MaxValidTime;
+ if (addr->prefix > 96 || addr->valid <= (uint32_t)now) {
+ char namebuf[INET6_ADDRSTRLEN];
- if (addr->valid > MaxValidTime)
- addr->valid = MaxValidTime;
+ inet_ntop(AF_INET6, addr, namebuf, sizeof(namebuf));
+ syslog(LOG_INFO, "Address %s (prefix %d, valid %u) not suitable as RA prefix on %s",
+ namebuf, addr->prefix, addr->valid, iface->ifname);
+ continue;
+ }
struct nd_opt_prefix_info *p = NULL;
for (size_t i = 0; i < cnt; ++i) {
p = &adv.prefix[cnt++];
}
- if (addr->preferred > 0) {
- if (minvalid > 1000ULL * addr->valid)
- minvalid = 1000ULL * addr->valid;
+ if (addr->preferred > (uint32_t)now) {
+ preferred = TIME_LEFT(addr->preferred, now);
- if (maxvalid < 1000ULL * addr->valid && (iface->default_router ||
- (addr->addr.s6_addr[0] & 0xfe) != 0xfc))
- maxvalid = 1000ULL * addr->valid;
+ if (iface->ra_useleasetime &&
+ preferred > iface->dhcpv4_leasetime)
+ preferred = iface->dhcpv4_leasetime;
}
+ valid = TIME_LEFT(addr->valid, now);
+ if (iface->ra_useleasetime && valid > iface->dhcpv4_leasetime)
+ valid = iface->dhcpv4_leasetime;
+
+ if (minvalid > valid)
+ minvalid = valid;
+
+ if (!IN6_IS_ADDR_ULA(&addr->addr) || iface->default_router)
+ valid_prefix = true;
odhcpd_bmemcpy(&p->nd_opt_pi_prefix, &addr->addr,
(iface->ra_advrouter) ? 128 : addr->prefix);
p->nd_opt_pi_flags_reserved |= ND_OPT_PI_FLAG_AUTO;
if (iface->ra_advrouter)
p->nd_opt_pi_flags_reserved |= ND_OPT_PI_FLAG_RADDR;
- p->nd_opt_pi_valid_time = htonl(addr->valid);
- p->nd_opt_pi_preferred_time = htonl(addr->preferred);
-
- if (addr->preferred > dns_time) {
- dns_time = addr->preferred;
- dns_pref = addr->addr;
- }
+ p->nd_opt_pi_preferred_time = htonl(preferred);
+ p->nd_opt_pi_valid_time = htonl(valid);
}
- if (!maxvalid && !iface->default_router && adv.h.nd_ra_router_lifetime) {
- syslog(LOG_WARNING, "A default route is present but there is no public prefix "
- "on %s thus we don't announce a default route!", iface->ifname);
+ // Calculate periodic transmit
+ uint32_t maxival;
+ int msecs = calc_adv_interval(iface, minvalid, &maxival);
+
+ if (default_route) {
+ if (!valid_prefix) {
+ syslog(LOG_WARNING, "A default route is present but there is no public prefix "
+ "on %s thus we don't announce a default route!", iface->ifname);
+ adv.h.nd_ra_router_lifetime = 0;
+ } else
+ adv.h.nd_ra_router_lifetime = htons(calc_ra_lifetime(iface, maxival));
+
+ } else
adv.h.nd_ra_router_lifetime = 0;
- }
+
+ syslog(LOG_INFO, "Using a RA lifetime of %d seconds on %s", ntohs(adv.h.nd_ra_router_lifetime), iface->ifname);
// DNS Recursive DNS
if (iface->dns_cnt > 0) {
dns_addr = iface->dns;
dns_cnt = iface->dns_cnt;
- dns_time = 0;
}
if (!dns_addr || IN6_IS_ADDR_UNSPECIFIED(dns_addr))
uint8_t pad;
uint8_t pad2;
uint32_t lifetime;
- } dns = {ND_OPT_RECURSIVE_DNS, (1 + (2 * dns_cnt)), 0, 0, htonl(dns_time)};
+ } dns = {ND_OPT_RECURSIVE_DNS, (1 + (2 * dns_cnt)), 0, 0, 0};
for (ssize_t i = 0; i < ipcnt; ++i) {
struct odhcpd_ipaddr *addr = &addrs[i];
- if (addr->dprefix > 64 || addr->dprefix == 0 ||
+ if (addr->dprefix > 64 || addr->dprefix == 0 || addr->valid <= (uint32_t)now ||
(addr->dprefix == 64 && addr->prefix == 64)) {
continue; // Address not suitable
} else if (addr->dprefix > 32) {
routes[routes_cnt].flags |= ND_RA_PREF_LOW;
else if (iface->route_preference > 0)
routes[routes_cnt].flags |= ND_RA_PREF_HIGH;
- routes[routes_cnt].lifetime = htonl(addr->valid);
+ routes[routes_cnt].lifetime = htonl(TIME_LEFT(addr->valid, now));
routes[routes_cnt].addr[0] = addr->addr.s6_addr32[0];
routes[routes_cnt].addr[1] = addr->addr.s6_addr32[1];
routes[routes_cnt].addr[2] = 0;
++routes_cnt;
}
- // Calculate periodic transmit
- int msecs = 0;
- uint32_t maxival = iface->ra_maxinterval * 1000;
- uint32_t minival;
-
- if (maxival < 4000 || maxival > MaxRtrAdvInterval * 1000)
- maxival = MaxRtrAdvInterval * 1000;
-
- if (maxival > minvalid / 3) {
- maxival = minvalid / 3;
-
- if (maxival < 4000)
- maxival = 4000;
- }
-
- minival = (maxival * 3) / 4;
- if (adv.h.nd_ra_router_lifetime)
- adv.h.nd_ra_router_lifetime = htons(maxvalid / 1000);
-
- search->lifetime = htonl(maxvalid / 1000);
-
- if (!dns.lifetime)
- dns.lifetime = search->lifetime;
-
- odhcpd_urandom(&msecs, sizeof(msecs));
- msecs = (labs(msecs) % (maxival - minival)) + minival;
+ search->lifetime = htonl(maxival*10);
+ dns.lifetime = search->lifetime;
struct icmpv6_opt adv_interval = {
.type = ND_OPT_RTR_ADV_INTERVAL,
.len = 1,
- .data = {0, 0, maxival >> 24, maxival >> 16, maxival >> 8, maxival}
+ .data = {0, 0, (maxival*1000) >> 24, (maxival*1000) >> 16, (maxival*1000) >> 8, maxival*1000}
};
struct iovec iov[RA_IOV_LEN] = {
size_t rewrite_cnt = iface->dns_cnt;
if (rewrite_cnt == 0) {
- if (odhcpd_get_preferred_interface_address(iface->ifindex, &addr) < 1)
+ if (odhcpd_get_linklocal_interface_address(iface->ifindex, &addr))
continue; // Unable to comply
rewrite = &addr;
projects / project / odhcpd.git / blobdiff