X-Git-Url: http://git.archive.openwrt.org/?p=project%2Fodhcpd.git;a=blobdiff_plain;f=src%2Frouter.c;h=cb2afc962b9f7aee14ab275b477b0ed7a799be1f;hp=3d26c5845fd96a08d2ddf1ca7bd7340d1b318481;hb=f4d38e0a853e933a4da54fde8ec2711b5dc5b741;hpb=ee243b09f3c81f824cc463c1c757e905f882350e diff --git a/src/router.c b/src/router.c index 3d26c58..cb2afc9 100644 --- a/src/router.c +++ b/src/router.c @@ -20,6 +20,7 @@ #include #include #include +#include #include #include "router.h" @@ -34,10 +35,11 @@ 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}; +static struct odhcpd_event router_event = {.uloop = {.fd = -1}, .handle_dgram = handle_icmpv6, }; static FILE *fp_route = NULL; +#define TIME_LEFT(t1, now) ((t1) != UINT32_MAX ? (t1) - (now) : UINT32_MAX) int init_router(void) { @@ -97,6 +99,9 @@ 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, @@ -113,7 +118,7 @@ int setup_router_interface(struct interface *iface, bool enable) 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); } if (iface->ra == RELAYD_RELAY || (iface->ra == RELAYD_SERVER && !iface->master)) @@ -176,7 +181,9 @@ 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, 0, false, 0, 0, 0}; + struct odhcpd_ipaddr p = { .addr.in6 = IN6ADDR_ANY_INIT, .prefix = 0, + .dprefix = 0, .preferred = 0, .valid = 0}; + while (fgets(line, sizeof(line), fp_route)) { uint32_t rflags; if (sscanf(line, "00000000000000000000000000000000 00 " @@ -185,15 +192,15 @@ static bool parse_routes(struct odhcpd_ipaddr *n, ssize_t len) found_default = true; } else if (sscanf(line, "%8" SCNx32 "%8" SCNx32 "%*8" SCNx32 "%*8" SCNx32 " %hhx %*s " "%*s 00000000000000000000000000000000 %*s %*s %*s %" SCNx32 " lo", - &p.addr.s6_addr32[0], &p.addr.s6_addr32[1], &p.prefix, &rflags) && + &p.addr.in6.s6_addr32[0], &p.addr.in6.s6_addr32[1], &p.prefix, &rflags) && p.prefix > 0 && (rflags & RTF_NONEXTHOP) && (rflags & RTF_REJECT)) { // Find source prefixes by scanning through unreachable-routes - p.addr.s6_addr32[0] = htonl(p.addr.s6_addr32[0]); - p.addr.s6_addr32[1] = htonl(p.addr.s6_addr32[1]); + p.addr.in6.s6_addr32[0] = htonl(p.addr.in6.s6_addr32[0]); + p.addr.in6.s6_addr32[1] = htonl(p.addr.in6.s6_addr32[1]); for (ssize_t i = 0; i < len; ++i) { if (n[i].prefix <= 64 && n[i].prefix >= p.prefix && - !odhcpd_bmemcmp(&p.addr, &n[i].addr, p.prefix)) { + !odhcpd_bmemcmp(&p.addr.in6, &n[i].addr.in6, p.prefix)) { n[i].dprefix = p.prefix; break; } @@ -205,95 +212,195 @@ 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; +} + +enum { + IOV_RA_ADV=0, + IOV_RA_PFXS, + IOV_RA_ROUTES, + IOV_RA_DNS, + IOV_RA_DNS_ADDR, + IOV_RA_SEARCH, + IOV_RA_ADV_INTERVAL, + IOV_RA_TOTAL, +}; // 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]; } 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; - if (iface->managed >= RELAYD_MANAGED_MFLAG) + if (iface->ra_managed >= RA_MANAGED_MFLAG) adv.h.nd_ra_flags_reserved |= ND_RA_FLAG_MANAGED; if (iface->route_preference < 0) 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 = NULL; 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)); + size_t size = sizeof(*addrs) * iface->ia_addr_len; + addrs = alloca(size); + memcpy(addrs, iface->ia_addr, size); + + ipcnt = iface->ia_addr_len; // 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); + + // Construct Prefix Information options + size_t pfxs_cnt = 0; + struct nd_opt_prefix_info *pfxs = NULL; + 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->addr.in6, 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) { - 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]; + for (size_t i = 0; i < pfxs_cnt; ++i) { + if (addr->prefix == pfxs[i].nd_opt_pi_prefix_len && + !odhcpd_bmemcmp(&pfxs[i].nd_opt_pi_prefix, + &addr->addr.in6, addr->prefix)) + p = &pfxs[i]; } if (!p) { - if (cnt >= ARRAY_SIZE(adv.prefix)) - break; + struct nd_opt_prefix_info *tmp; - p = &adv.prefix[cnt++]; + tmp = realloc(pfxs, sizeof(*pfxs) * (pfxs_cnt + 1)); + if (!tmp) { + syslog(LOG_ERR, "Realloc failed for RA prefix option on interface %s", iface->ifname); + continue; + } + + pfxs = tmp; + p = &pfxs[pfxs_cnt++]; + memset(p, 0, sizeof(*p)); } - 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, + 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.in6) || iface->default_router) + valid_prefix = true; + + odhcpd_bmemcpy(&p->nd_opt_pi_prefix, &addr->addr.in6, (iface->ra_advrouter) ? 128 : addr->prefix); p->nd_opt_pi_type = ND_OPT_PREFIX_INFORMATION; p->nd_opt_pi_len = 4; @@ -301,30 +408,35 @@ static uint64_t send_router_advert(struct interface *iface, const struct in6_add 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 && addr->prefix <= 64) + if (iface->ra_managed < RA_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_pref = addr->addr; - } + 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)) @@ -336,9 +448,7 @@ static uint64_t send_router_advert(struct interface *iface, const struct in6_add 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}; // DNS Search options uint8_t search_buf[256], *search_domain = iface->search; @@ -369,7 +479,6 @@ static uint64_t send_router_advert(struct interface *iface, const struct in6_add 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); @@ -382,20 +491,29 @@ static uint64_t send_router_advert(struct interface *iface, const struct in6_add uint8_t flags; uint32_t lifetime; uint32_t addr[4]; - } routes[RELAYD_MAX_PREFIXES]; + } *tmp, *routes = NULL; 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) { - addr->addr.s6_addr32[1] &= htonl(~((1U << (64 - addr->dprefix)) - 1)); + addr->addr.in6.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; + addr->addr.in6.s6_addr32[0] &= htonl(~((1U << (32 - addr->dprefix)) - 1)); + addr->addr.in6.s6_addr32[1] = 0; + } + + tmp = realloc(routes, sizeof(*routes) * (routes_cnt + 1)); + if (!tmp) { + syslog(LOG_ERR, "Realloc failed for RA route option on interface %s", iface->ifname); + continue; } + routes = tmp; + + memset(&routes[routes_cnt], 0, sizeof(*routes)); routes[routes_cnt].type = ND_OPT_ROUTE_INFO; routes[routes_cnt].len = sizeof(*routes) / 8; routes[routes_cnt].prefix = addr->dprefix; @@ -404,46 +522,32 @@ static uint64_t send_router_advert(struct interface *iface, const struct in6_add 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].addr[0] = addr->addr.s6_addr32[0]; - routes[routes_cnt].addr[1] = addr->addr.s6_addr32[1]; + routes[routes_cnt].lifetime = htonl(TIME_LEFT(addr->valid, now)); + routes[routes_cnt].addr[0] = addr->addr.in6.s6_addr32[0]; + routes[routes_cnt].addr[1] = addr->addr.in6.s6_addr32[1]; 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; + 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[] = {{&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}, - {&adv_interval, adv_interval.len * 8}}; + struct iovec iov[IOV_RA_TOTAL] = { + [IOV_RA_ADV] = {&adv, sizeof(adv)}, + [IOV_RA_PFXS] = {pfxs, pfxs_cnt * sizeof(*pfxs)}, + [IOV_RA_ROUTES] = {routes, routes_cnt * sizeof(*routes)}, + [IOV_RA_DNS] = {&dns, (dns_cnt) ? sizeof(dns) : 0}, + [IOV_RA_DNS_ADDR] = {dns_addr, dns_cnt * sizeof(*dns_addr)}, + [IOV_RA_SEARCH] = {search, search->len * 8}, + [IOV_RA_ADV_INTERVAL] = {&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)) @@ -452,6 +556,9 @@ static uint64_t send_router_advert(struct interface *iface, const struct in6_add odhcpd_send(router_event.uloop.fd, &dest, iov, ARRAY_SIZE(iov), iface); + free(pfxs); + free(routes); + return msecs; } @@ -553,7 +660,7 @@ 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_preferred_interface_address(iface->ifindex, &addr) < 1) + if (odhcpd_get_interface_dns_addr(iface, &addr)) continue; // Unable to comply rewrite = &addr;