X-Git-Url: http://git.archive.openwrt.org/?p=project%2Fodhcpd.git;a=blobdiff_plain;f=src%2Frouter.c;h=7600e2f0a7ae503bcba1e3509ef24796a976b712;hp=990782426967271a985eec10e558d95d76cb57b4;hb=2cb6b4872a1981f2acce40018107481c82a529dc;hpb=e60710d1fe0c5bf19b9acf9b116e0645e8e114d1 diff --git a/src/router.c b/src/router.c index 9907824..7600e2f 100644 --- a/src/router.c +++ b/src/router.c @@ -20,6 +20,7 @@ #include #include #include +#include #include #include "router.h" @@ -34,7 +35,7 @@ static void handle_icmpv6(void *addr, void *data, size_t len, 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, NULL}; +static struct odhcpd_event router_event = {.uloop = {.fd = -1}, .handle_dgram = handle_icmpv6, }; static FILE *fp_route = NULL; #define RA_IOV_LEN 6 @@ -99,6 +100,9 @@ int setup_router_interface(struct interface *iface, bool enable) 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, @@ -116,6 +120,7 @@ int setup_router_interface(struct interface *iface, bool enable) } else if (iface->ra == RELAYD_SERVER && !iface->master) { iface->timer_rs.cb = trigger_router_advert; uloop_timeout_set(&iface->timer_rs, 1000); + ndp_rqs_addr6_dump(); } if (iface->ra == RELAYD_RELAY || (iface->ra == RELAYD_SERVER && !iface->master)) @@ -207,16 +212,65 @@ static bool parse_routes(struct odhcpd_ipaddr *n, ssize_t len) 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"); + uint32_t 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; @@ -241,12 +295,17 @@ static uint64_t send_router_advert(struct interface *iface, const struct in6_add 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); + odhcpd_get_mac(iface, adv.lladdr.data); // If not currently shutting down - struct odhcpd_ipaddr addrs[8]; + struct odhcpd_ipaddr addrs[RELAYD_MAX_ADDRS]; ssize_t ipcnt = 0; - int64_t minvalid = INT64_MAX; + uint32_t minvalid = UINT32_MAX; + bool default_route = false; + bool valid_prefix = false; // If not shutdown if (iface->timer_rs.cb) { @@ -254,10 +313,13 @@ static uint64_t send_router_advert(struct interface *iface, const struct in6_add memcpy(addrs, iface->ia_addr, ipcnt * sizeof(*addrs)); // Check default route - if (parse_routes(addrs, ipcnt)) - adv.h.nd_ra_router_lifetime = htons(1); - if (iface->default_router > 1) - adv.h.nd_ra_router_lifetime = htons(iface->default_router); + 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 @@ -266,12 +328,21 @@ static uint64_t send_router_advert(struct interface *iface, const struct in6_add struct in6_addr dns_pref, *dns_addr = &dns_pref; size_t dns_cnt = 1; - odhcpd_get_linklocal_interface_address(iface->ifindex, &dns_pref); + 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->valid <= (uint32_t)now) - continue; // Address not suitable + uint32_t preferred = 0; + uint32_t valid = 0; + + if (addr->prefix > 96 || addr->valid <= (uint32_t)now) { + char namebuf[INET6_ADDRSTRLEN]; + + 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) { @@ -288,17 +359,23 @@ static uint64_t send_router_advert(struct interface *iface, const struct in6_add p = &adv.prefix[cnt++]; } - if (addr->preferred > (uint32_t)now && - minvalid > 1000LL * TIME_LEFT(addr->valid, now)) - minvalid = 1000LL * TIME_LEFT(addr->valid, now); + if (addr->preferred > (uint32_t)now) { + preferred = TIME_LEFT(addr->preferred, now); - uint32_t this_lifetime = TIME_LEFT(addr->valid, now); - if (this_lifetime > UINT16_MAX) - this_lifetime = UINT16_MAX; - if (((addr->addr.s6_addr[0] & 0xfe) != 0xfc || iface->default_router) - && adv.h.nd_ra_router_lifetime - && ntohs(adv.h.nd_ra_router_lifetime) < this_lifetime) - adv.h.nd_ra_router_lifetime = htons(this_lifetime); + 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); @@ -312,18 +389,26 @@ static uint64_t send_router_advert(struct interface *iface, const struct in6_add 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(TIME_LEFT(addr->valid, now)); - if (addr->preferred > (uint32_t)now) - p->nd_opt_pi_preferred_time = htonl(TIME_LEFT(addr->preferred, now)); - else if (addr->valid - now < 7200) - p->nd_opt_pi_valid_time = 0; + p->nd_opt_pi_preferred_time = htonl(preferred); + p->nd_opt_pi_valid_time = htonl(valid); } - if (!iface->default_router && adv.h.nd_ra_router_lifetime == htons(1)) { - 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) { @@ -416,33 +501,13 @@ static uint64_t send_router_advert(struct interface *iface, const struct in6_add ++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; - - search->lifetime = htonl(maxival / 100); + search->lifetime = htonl(maxival*10); dns.lifetime = search->lifetime; - 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} + .data = {0, 0, (maxival*1000) >> 24, (maxival*1000) >> 16, (maxival*1000) >> 8, maxival*1000} }; struct iovec iov[RA_IOV_LEN] = { @@ -561,7 +626,7 @@ static void forward_router_advertisement(uint8_t *data, size_t len) size_t rewrite_cnt = iface->dns_cnt; if (rewrite_cnt == 0) { - if (odhcpd_get_linklocal_interface_address(iface->ifindex, &addr)) + if (odhcpd_get_interface_dns_addr(iface, &addr)) continue; // Unable to comply rewrite = &addr;