static void forward_router_advertisement(uint8_t *data, size_t len);
static void handle_icmpv6(void *addr, void *data, size_t len,
- struct interface *iface);
-static void send_router_advert(struct uloop_timeout *event);
+ struct interface *iface, void *dest);
+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};
int setup_router_interface(struct interface *iface, bool enable)
{
+ if (!fp_route || router_event.uloop.fd < 0)
+ return -1;
+
struct ipv6_mreq all_nodes = {ALL_IPV6_NODES, iface->ifindex};
struct ipv6_mreq all_routers = {ALL_IPV6_ROUTERS, iface->ifindex};
if (!enable) {
if (iface->ra)
- send_router_advert(&iface->timer_rs);
+ trigger_router_advert(&iface->timer_rs);
} else {
void *mreq = &all_routers;
mreq = &all_nodes;
forward_router_solicitation(iface);
} else if (iface->ra == RELAYD_SERVER && !iface->master) {
- iface->timer_rs.cb = send_router_advert;
- send_router_advert(&iface->timer_rs);
+ iface->timer_rs.cb = trigger_router_advert;
+ trigger_router_advert(&iface->timer_rs);
}
if (iface->ra == RELAYD_RELAY || (iface->ra == RELAYD_SERVER && !iface->master))
uloop_timeout_set(&iface->timer_rs, 1000);
}
-
-// Event handler for incoming ICMPv6 packets
-static void handle_icmpv6(_unused void *addr, void *data, size_t len,
- struct interface *iface)
+static bool router_icmpv6_valid(struct sockaddr_in6 *source, uint8_t *data, size_t len)
{
- struct icmp6_hdr *hdr = data;
- if ((iface->ra == RELAYD_SERVER && !iface->master)) { // Server mode
- if (hdr->icmp6_type == ND_ROUTER_SOLICIT)
- send_router_advert(&iface->timer_rs);
- } else if (iface->ra == RELAYD_RELAY) { // Relay mode
- if (hdr->icmp6_type == ND_ROUTER_ADVERT && iface->master)
- forward_router_advertisement(data, len);
- else if (hdr->icmp6_type == ND_ROUTER_SOLICIT && !iface->master)
- forward_router_solicitation(odhcpd_get_master_interface());
- }
-}
+ struct icmp6_hdr *hdr = (struct icmp6_hdr *)data;
+ struct icmpv6_opt *opt, *end = (struct icmpv6_opt*)&data[len];
+
+ /* Hoplimit is already checked in odhcpd_receive_packets */
+ if (len < sizeof(*hdr) || hdr->icmp6_code)
+ return false;
+ switch (hdr->icmp6_type) {
+ case ND_ROUTER_ADVERT:
+ if (!IN6_IS_ADDR_LINKLOCAL(&source->sin6_addr))
+ return false;
-static bool match_route(const struct odhcpd_ipaddr *n, const struct in6_addr *addr)
-{
- if (n->prefix <= 32)
- return ntohl(n->addr.s6_addr32[0]) >> (32 - n->prefix) ==
- ntohl(addr->s6_addr32[0]) >> (32 - n->prefix);
+ opt = (struct icmpv6_opt *)((struct nd_router_advert *)data + 1);
+ break;
- if (n->addr.s6_addr32[0] != addr->s6_addr32[0])
+ case ND_ROUTER_SOLICIT:
+ opt = (struct icmpv6_opt *)((struct nd_router_solicit *)data + 1);
+ break;
+
+ default:
return false;
+ }
- return ntohl(n->addr.s6_addr32[1]) >> (64 - n->prefix) ==
- ntohl(addr->s6_addr32[1]) >> (64 - n->prefix);
+ icmpv6_for_each_option(opt, opt, end)
+ if (opt->type == ND_OPT_SOURCE_LINKADDR &&
+ IN6_IS_ADDR_UNSPECIFIED(&source->sin6_addr) &&
+ hdr->icmp6_type == ND_ROUTER_SOLICIT)
+ return false;
+
+ // Check all options parsed successfully
+ return opt == end;
}
char line[512], ifname[16];
bool found_default = false;
- struct odhcpd_ipaddr p = {IN6ADDR_ANY_INIT, 0, false, 0, 0, 0};
+ struct odhcpd_ipaddr p = {IN6ADDR_ANY_INIT, 0, 0, false, 0, 0, 0};
while (fgets(line, sizeof(line), fp_route)) {
uint32_t rflags;
if (sscanf(line, "00000000000000000000000000000000 00 "
for (ssize_t i = 0; i < len; ++i) {
if (n[i].prefix <= 64 && n[i].prefix >= p.prefix &&
- match_route(&p, &n[i].addr)) {
- n[i].prefix = p.prefix;
+ !odhcpd_bmemcmp(&p.addr, &n[i].addr, p.prefix)) {
+ n[i].dprefix = p.prefix;
break;
}
}
// Router Advert server mode
-static void send_router_advert(struct uloop_timeout *event)
+static uint64_t send_router_advert(struct interface *iface, const struct in6_addr *from)
{
- struct interface *iface =
- container_of(event, struct interface, timer_rs);
-
int mtu = odhcpd_get_interface_mtu(iface->ifname);
if (mtu < 0)
mtu = 1500;
// If not currently shutting down
struct odhcpd_ipaddr addrs[RELAYD_MAX_PREFIXES];
ssize_t ipcnt = 0;
+ uint64_t maxpreferred = 0;
// If not shutdown
- if (event->cb) {
+ if (iface->timer_rs.cb) {
ipcnt = odhcpd_get_interface_addresses(iface->ifindex,
addrs, ARRAY_SIZE(addrs));
bool have_public = false;
size_t cnt = 0;
- struct in6_addr *dns_addr = NULL;
+ struct in6_addr dns_pref = IN6ADDR_ANY_INIT, *dns_addr = &dns_pref;
uint32_t dns_time = 0;
size_t dns_cnt = 1;
for (ssize_t i = 0; i < ipcnt; ++i) {
struct odhcpd_ipaddr *addr = &addrs[i];
- if (addr->prefix > 64 || addr->has_class)
+ if (addr->prefix > 96 || addr->has_class)
continue; // Address not suitable
if (addr->preferred > MaxPreferredTime)
struct nd_opt_prefix_info *p = NULL;
for (size_t i = 0; i < cnt; ++i) {
- if (!memcmp(&adv.prefix[i].nd_opt_pi_prefix,
- &addr->addr, 8))
+ if (addr->prefix == adv.prefix[i].nd_opt_pi_prefix_len &&
+ !odhcpd_bmemcmp(&adv.prefix[i].nd_opt_pi_prefix,
+ &addr->addr, addr->prefix))
p = &adv.prefix[i];
}
p = &adv.prefix[cnt++];
}
- if ((addr->addr.s6_addr[0] & 0xfe) != 0xfc && addr->preferred > 0)
+ if ((addr->addr.s6_addr[0] & 0xfe) != 0xfc && addr->preferred > 0) {
have_public = true;
- memcpy(&p->nd_opt_pi_prefix, &addr->addr, 8);
+ if (maxpreferred < 1000 * addr->preferred)
+ maxpreferred = 1000 * addr->preferred;
+ }
+
+ 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 = 64;
+ p->nd_opt_pi_prefix_len = (addr->prefix < 64) ? 64 : addr->prefix;
p->nd_opt_pi_flags_reserved = 0;
if (!iface->ra_not_onlink)
p->nd_opt_pi_flags_reserved |= ND_OPT_PI_FLAG_ONLINK;
- if (iface->managed < RELAYD_MANAGED_NO_AFLAG)
+ if (iface->managed < RELAYD_MANAGED_NO_AFLAG && addr->prefix <= 64)
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_addr = &addr->addr;
+ dns_pref = addr->addr;
}
}
adv.h.nd_ra_router_lifetime = 0;
}
- if (have_public && iface->deprecate_ula_if_public_avail)
- for (size_t i = 0; i < cnt; ++i)
- if ((adv.prefix[i].nd_opt_pi_prefix.s6_addr[0] & 0xfe) == 0xfc)
- adv.prefix[i].nd_opt_pi_preferred_time = 0;
-
// DNS Recursive DNS
if (iface->dns_cnt > 0) {
dns_addr = iface->dns;
dns_time = 2 * MaxRtrAdvInterval;
}
- if (!dns_addr)
+ if (!dns_addr || IN6_IS_ADDR_UNSPECIFIED(dns_addr))
dns_cnt = 0;
struct {
uint32_t lifetime;
uint8_t name[];
} *search = alloca(sizeof(*search) + search_padded);
+
search->type = ND_OPT_DNS_SEARCH;
search->len = search_len ? ((sizeof(*search) + search_padded) / 8) : 0;
search->pad = 0;
for (ssize_t i = 0; i < ipcnt; ++i) {
struct odhcpd_ipaddr *addr = &addrs[i];
- if (addr->prefix > 64 || addr->prefix == 0) {
+ if (addr->dprefix > 64 || addr->dprefix == 0 ||
+ (addr->dprefix == 64 && addr->prefix == 64)) {
continue; // Address not suitable
- } else if (addr->prefix > 32) {
- addr->addr.s6_addr32[1] &= htonl(~((1U << (64 - addr->prefix)) - 1));
- } else if (addr->prefix <= 32) {
- addr->addr.s6_addr32[0] &= htonl(~((1U << (32 - addr->prefix)) - 1));
+ } else if (addr->dprefix > 32) {
+ addr->addr.s6_addr32[1] &= htonl(~((1U << (64 - addr->dprefix)) - 1));
+ } else if (addr->dprefix <= 32) {
+ addr->addr.s6_addr32[0] &= htonl(~((1U << (32 - addr->dprefix)) - 1));
addr->addr.s6_addr32[1] = 0;
}
routes[routes_cnt].type = ND_OPT_ROUTE_INFO;
routes[routes_cnt].len = sizeof(*routes) / 8;
- routes[routes_cnt].prefix = addr->prefix;
+ routes[routes_cnt].prefix = addr->dprefix;
routes[routes_cnt].flags = 0;
if (iface->route_preference < 0)
routes[routes_cnt].flags |= ND_RA_PREF_LOW;
routes[routes_cnt].lifetime = htonl(addr->valid);
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] = addr->addr.s6_addr32[2];
- routes[routes_cnt].addr[3] = addr->addr.s6_addr32[3];
+ routes[routes_cnt].addr[2] = 0;
+ routes[routes_cnt].addr[3] = 0;
++routes_cnt;
}
+ // Calculate periodic transmit
+ int msecs = 0;
+ uint32_t maxival = MaxRtrAdvInterval * 1000;
+ uint32_t minival = MinRtrAdvInterval * 1000;
+
+ if (maxpreferred > 0 && maxival > maxpreferred / 2) {
+ maxival = maxpreferred / 2;
+ if (maxival < 4000)
+ maxival = 4000;
+
+ if (maxival >= 9000)
+ minival = maxival / 3;
+ else
+ minival = (maxival * 3) / 4;
+ }
+
+ odhcpd_urandom(&msecs, sizeof(msecs));
+ msecs = (labs(msecs) % (maxival - minival)) + minival;
+
+ struct icmpv6_opt adv_interval = {
+ .type = ND_OPT_RTR_ADV_INTERVAL,
+ .len = 1,
+ .data = {0, 0, maxival >> 24, maxival >> 16, maxival >> 8, maxival}
+ };
struct iovec iov[] = {{&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}};
- struct sockaddr_in6 all_nodes = {AF_INET6, 0, 0, ALL_IPV6_NODES, 0};
+ {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))
+ dest.sin6_addr = *from;
+
odhcpd_send(router_event.uloop.fd,
- &all_nodes, iov, ARRAY_SIZE(iov), iface);
+ &dest, iov, ARRAY_SIZE(iov), iface);
- // Rearm timer
- int msecs;
- odhcpd_urandom(&msecs, sizeof(msecs));
- msecs = (labs(msecs) % (1000 * (MaxRtrAdvInterval
- - MinRtrAdvInterval))) + (MinRtrAdvInterval * 1000);
- uloop_timeout_set(&iface->timer_rs, msecs);
+ return msecs;
+}
+
+
+static void trigger_router_advert(struct uloop_timeout *event)
+{
+ struct interface *iface = container_of(event, struct interface, timer_rs);
+ int msecs = send_router_advert(iface, NULL);
+
+ // Rearm timer if not shut down
+ if (event->cb)
+ uloop_timeout_set(event, msecs);
+}
+
+
+// Event handler for incoming ICMPv6 packets
+static void handle_icmpv6(void *addr, void *data, size_t len,
+ struct interface *iface, _unused void *dest)
+{
+ struct icmp6_hdr *hdr = data;
+ struct sockaddr_in6 *from = addr;
+
+ if (!router_icmpv6_valid(addr, data, len))
+ return;
+
+ if ((iface->ra == RELAYD_SERVER && !iface->master)) { // Server mode
+ if (hdr->icmp6_type == ND_ROUTER_SOLICIT)
+ send_router_advert(iface, &from->sin6_addr);
+ } else if (iface->ra == RELAYD_RELAY) { // Relay mode
+ if (hdr->icmp6_type == ND_ROUTER_ADVERT && iface->master)
+ forward_router_advertisement(data, len);
+ else if (hdr->icmp6_type == ND_ROUTER_SOLICIT && !iface->master)
+ forward_router_solicitation(odhcpd_get_master_interface());
+ }
}
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_preferred_interface_address(iface->ifindex, &addr) < 1)
continue; // Unable to comply
- rewrite = &addr.addr;
+ rewrite = &addr;
rewrite_cnt = 1;
}
projects / project / odhcpd.git / blobdiff