Merge pull request #22 from mehlis/log-dhcp4-events
[project/odhcpd.git] / src / router.c
index 372c400..a45a8cb 100644 (file)
@@ -30,7 +30,7 @@ static void forward_router_solicitation(const struct interface *iface);
 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);
+               struct interface *iface, void *dest);
 static void send_router_advert(struct uloop_timeout *event);
 static void sigusr1_refresh(int signal);
 
@@ -88,6 +88,9 @@ int init_router(void)
 
 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};
 
@@ -167,7 +170,7 @@ static bool router_icmpv6_valid(struct sockaddr_in6 *source, uint8_t *data, size
 
 // Event handler for incoming ICMPv6 packets
 static void handle_icmpv6(void *addr, void *data, size_t len,
-               struct interface *iface)
+               struct interface *iface, _unused void *dest)
 {
        struct icmp6_hdr *hdr = data;
 
@@ -186,20 +189,6 @@ static void handle_icmpv6(void *addr, void *data, size_t len,
 }
 
 
-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);
-
-       if (n->addr.s6_addr32[0] != addr->s6_addr32[0])
-               return false;
-
-       return ntohl(n->addr.s6_addr32[1]) >> (64 - n->prefix) ==
-                       ntohl(addr->s6_addr32[1]) >> (64 - n->prefix);
-}
-
-
 // Detect whether a default route exists, also find the source prefixes
 static bool parse_routes(struct odhcpd_ipaddr *n, ssize_t len)
 {
@@ -207,7 +196,7 @@ static bool parse_routes(struct odhcpd_ipaddr *n, ssize_t len)
 
        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 "
@@ -224,8 +213,8 @@ static bool parse_routes(struct odhcpd_ipaddr *n, ssize_t len)
 
                        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;
                                }
                        }
@@ -290,13 +279,13 @@ static void send_router_advert(struct uloop_timeout *event)
        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)
@@ -307,8 +296,9 @@ static void send_router_advert(struct uloop_timeout *event)
 
                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];
                }
 
@@ -326,21 +316,21 @@ static void send_router_advert(struct uloop_timeout *event)
                                maxpreferred = 1000 * addr->preferred;
                }
 
-               memcpy(&p->nd_opt_pi_prefix, &addr->addr, 8);
+               odhcpd_bmemcpy(&p->nd_opt_pi_prefix, &addr->addr, 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;
                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;
                }
        }
 
@@ -357,7 +347,7 @@ static void send_router_advert(struct uloop_timeout *event)
                dns_time = 2 * MaxRtrAdvInterval;
        }
 
-       if (!dns_addr)
+       if (!dns_addr || IN6_IS_ADDR_UNSPECIFIED(dns_addr))
                dns_cnt = 0;
 
        struct {
@@ -420,18 +410,19 @@ static void send_router_advert(struct uloop_timeout *event)
 
        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;
@@ -440,8 +431,8 @@ static void send_router_advert(struct uloop_timeout *event)
                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;
        }