#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))
char line[512], ifname[16];
bool found_default = false;
- struct odhcpd_ipaddr p = {IN6ADDR_ANY_INIT, 0, 0, false, 0, 0, 0};
+ struct odhcpd_ipaddr p = {IN6ADDR_ANY_INIT, 0, 0, 0, 0};
while (fgets(line, sizeof(line), fp_route)) {
uint32_t rflags;
if (sscanf(line, "00000000000000000000000000000000 00 "
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)
{
- int mtu = odhcpd_get_interface_mtu(iface->ifname);
- if (mtu < 0)
- mtu = 1500;
+ time_t now = odhcpd_time();
+ int mtu = iface->ra_mtu;
+ int hlim = iface->ra_hoplimit;
+
+ if (mtu == 0)
+ mtu = odhcpd_get_interface_config(iface->ifname, "mtu");
+
+ if (mtu < 1280)
+ mtu = 1280;
+
+ if (hlim == 0)
+ hlim = odhcpd_get_interface_config(iface->ifname, "hop_limit");
struct {
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}},
.mtu = {ND_OPT_MTU, 1, 0, htonl(mtu)},
};
+ if (hlim > 0)
+ adv.h.nd_ra_curhoplimit = hlim;
+
if (iface->dhcpv6)
adv.h.nd_ra_flags_reserved = ND_RA_FLAG_OTHER;
adv.h.nd_ra_flags_reserved |= ND_RA_PREF_LOW;
else if (iface->route_preference > 0)
adv.h.nd_ra_flags_reserved |= ND_RA_PREF_HIGH;
+
+ adv.h.nd_ra_reachable = htonl(iface->ra_reachabletime);
+ adv.h.nd_ra_retransmit = htonl(iface->ra_retranstime);
+
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 maxpreferred = 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 =
- htons(3 * MaxRtrAdvInterval);
+ 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
- bool have_public = false;
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_interface_dns_addr(iface, &dns_pref);
+
for (ssize_t i = 0; i < ipcnt; ++i) {
struct odhcpd_ipaddr *addr = &addrs[i];
- if (addr->prefix > 96 || addr->has_class)
- continue; // Address not suitable
+ uint32_t preferred = 0;
+ uint32_t valid = 0;
- if (addr->preferred > MaxPreferredTime)
- addr->preferred = MaxPreferredTime;
+ 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->addr.s6_addr[0] & 0xfe) != 0xfc && addr->preferred > 0) {
- have_public = true;
+ if (addr->preferred > (uint32_t)now) {
+ preferred = TIME_LEFT(addr->preferred, now);
- if (maxpreferred < 1000 * addr->preferred)
- maxpreferred = 1000 * addr->preferred;
+ if (iface->ra_useleasetime &&
+ preferred > iface->dhcpv4_leasetime)
+ preferred = iface->dhcpv4_leasetime;
}
- odhcpd_bmemcpy(&p->nd_opt_pi_prefix, &addr->addr, addr->prefix);
+ 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_type = ND_OPT_PREFIX_INFORMATION;
p->nd_opt_pi_len = 4;
p->nd_opt_pi_prefix_len = (addr->prefix < 64) ? 64 : addr->prefix;
p->nd_opt_pi_flags_reserved |= ND_OPT_PI_FLAG_ONLINK;
if (iface->managed < RELAYD_MANAGED_NO_AFLAG && addr->prefix <= 64)
p->nd_opt_pi_flags_reserved |= ND_OPT_PI_FLAG_AUTO;
- 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;
- }
+ if (iface->ra_advrouter)
+ p->nd_opt_pi_flags_reserved |= ND_OPT_PI_FLAG_RADDR;
+ p->nd_opt_pi_preferred_time = htonl(preferred);
+ p->nd_opt_pi_valid_time = htonl(valid);
}
- if (!have_public && !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 = 2 * MaxRtrAdvInterval;
}
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};
search->len = search_len ? ((sizeof(*search) + search_padded) / 8) : 0;
search->pad = 0;
search->pad2 = 0;
- search->lifetime = htonl(2 * MaxRtrAdvInterval);;
memcpy(search->name, search_domain, search_len);
memset(&search->name[search_len], 0, search_padded - search_len);
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;
}
+ search->lifetime = htonl(maxival*10);
+ dns.lifetime = search->lifetime;
- struct iovec iov[] = {{&adv, (uint8_t*)&adv.prefix[cnt] - (uint8_t*)&adv},
+ struct icmpv6_opt adv_interval = {
+ .type = ND_OPT_RTR_ADV_INTERVAL,
+ .len = 1,
+ .data = {0, 0, (maxival*1000) >> 24, (maxival*1000) >> 16, (maxival*1000) >> 8, maxival*1000}
+ };
+
+ struct iovec iov[RA_IOV_LEN] = {
+ {&adv, (uint8_t*)&adv.prefix[cnt] - (uint8_t*)&adv},
{&routes, routes_cnt * sizeof(*routes)},
{&dns, (dns_cnt) ? sizeof(dns) : 0},
{dns_addr, dns_cnt * sizeof(*dns_addr)},
- {search, search->len * 8}};
+ {search, search->len * 8},
+ {&adv_interval, adv_interval.len * 8}};
struct sockaddr_in6 dest = {AF_INET6, 0, 0, ALL_IPV6_NODES, 0};
if (from && !IN6_IS_ADDR_UNSPECIFIED(from))
odhcpd_send(router_event.uloop.fd,
&dest, iov, ARRAY_SIZE(iov), iface);
- return maxpreferred;
+ return msecs;
}
static void trigger_router_advert(struct uloop_timeout *event)
{
struct interface *iface = container_of(event, struct interface, timer_rs);
- uint64_t maxpreferred = send_router_advert(iface, NULL);
+ int msecs = send_router_advert(iface, NULL);
// Rearm timer if not shut down
- if (event->cb) {
- uint32_t maxinterval = MaxRtrAdvInterval * 1000;
- uint32_t mininterval = MinRtrAdvInterval * 1000;
-
- if (maxpreferred > 0 && maxinterval > maxpreferred / 2) {
- maxinterval = maxpreferred / 2;
- if (maxinterval < 4000)
- maxinterval = 4000;
-
- if (maxinterval >= 9000)
- mininterval = maxinterval / 3;
- else
- mininterval = (maxinterval * 3) / 4;
- }
-
- int msecs;
- odhcpd_urandom(&msecs, sizeof(msecs));
- msecs = (labs(msecs) % (maxinterval - mininterval)) + mininterval;
+ if (event->cb)
uloop_timeout_set(event, msecs);
- }
}
struct sockaddr_in6 all_nodes = {AF_INET6, 0, 0, ALL_IPV6_NODES, 0};
struct iovec iov = {data, len};
- struct odhcpd_ipaddr addr;
struct interface *iface;
list_for_each_entry(iface, &interfaces, head) {
if (iface->ra != RELAYD_RELAY || iface->master)
// If we have to rewrite DNS entries
if (iface->always_rewrite_dns && dns_ptr && dns_count > 0) {
const struct in6_addr *rewrite = iface->dns;
+ struct in6_addr addr;
size_t rewrite_cnt = iface->dns_cnt;
if (rewrite_cnt == 0) {
- if (odhcpd_get_interface_addresses(iface->ifindex, &addr, 1) < 1)
+ if (odhcpd_get_interface_dns_addr(iface, &addr))
continue; // Unable to comply
- rewrite = &addr.addr;
+ rewrite = &addr;
rewrite_cnt = 1;
}
projects / project / odhcpd.git / blobdiff