X-Git-Url: http://git.archive.openwrt.org/?p=project%2Fodhcpd.git;a=blobdiff_plain;f=src%2Fndp.c;h=49aea1cb5e0479d2dbc7cecf9ee724a8cafbc5a1;hp=c1ac063ccbeda7e293c1804424a54917973d9f49;hb=2b3355f14e2030ce5af46ec946af496fadbd31cb;hpb=52bca1137bbd954e8a905a22f637c6565e14ac35 diff --git a/src/ndp.c b/src/ndp.c index c1ac063..49aea1c 100644 --- a/src/ndp.c +++ b/src/ndp.c @@ -28,22 +28,38 @@ #include #include -#include "router.h" -#include "ndp.h" +#include +#include +#include +#include "dhcpv6.h" +#include "odhcpd.h" + +struct event_socket { + struct odhcpd_event ev; + struct nl_sock *sock; + int sock_bufsize; +}; static void handle_solicit(void *addr, void *data, size_t len, struct interface *iface, void *dest); -static void handle_rtnetlink(void *addr, void *data, size_t len, - struct interface *iface, void *dest); -static ssize_t ping6(struct in6_addr *addr, - const struct interface *iface); +static void handle_rtnl_event(struct odhcpd_event *ev); +static int cb_rtnl_valid(struct nl_msg *msg, void *arg); +static void catch_rtnl_err(struct odhcpd_event *e, int error); -static uint32_t rtnl_seqid = 0; +static int addr6_dump_rqs = 0; static int ping_socket = -1; -static struct odhcpd_event rtnl_event = {{.fd = -1}, handle_rtnetlink}; - +static struct event_socket rtnl_event = { + .ev = { + .uloop = {.fd = - 1, }, + .handle_dgram = NULL, + .handle_error = catch_rtnl_err, + .recv_msgs = handle_rtnl_event, + }, + .sock = NULL, + .sock_bufsize = 133120, +}; // Filter ICMPv6 messages of type neighbor soliciation static struct sock_filter bpf[] = { @@ -61,29 +77,28 @@ static const struct sock_fprog bpf_prog = {sizeof(bpf) / sizeof(*bpf), bpf}; // Initialize NDP-proxy int init_ndp(void) { - // Setup netlink socket - if ((rtnl_event.uloop.fd = odhcpd_open_rtnl()) < 0) - return -1; - - // Receive netlink neighbor and ip-address events - uint32_t group = RTNLGRP_IPV6_IFADDR; - setsockopt(rtnl_event.uloop.fd, SOL_NETLINK, - NETLINK_ADD_MEMBERSHIP, &group, sizeof(group)); - group = RTNLGRP_IPV6_ROUTE; - setsockopt(rtnl_event.uloop.fd, SOL_NETLINK, - NETLINK_ADD_MEMBERSHIP, &group, sizeof(group)); - - // Synthesize initial address events - struct { - struct nlmsghdr nh; - struct ifaddrmsg ifa; - } req2 = { - {sizeof(req2), RTM_GETADDR, NLM_F_REQUEST | NLM_F_DUMP, - ++rtnl_seqid, 0}, - {.ifa_family = AF_INET6} - }; - send(rtnl_event.uloop.fd, &req2, sizeof(req2), MSG_DONTWAIT); - odhcpd_register(&rtnl_event); + int val = 2; + + rtnl_event.sock = odhcpd_create_nl_socket(NETLINK_ROUTE); + if (!rtnl_event.sock) + goto err; + + rtnl_event.ev.uloop.fd = nl_socket_get_fd(rtnl_event.sock); + + if (nl_socket_set_buffer_size(rtnl_event.sock, rtnl_event.sock_bufsize, 0)) + goto err; + + nl_socket_disable_seq_check(rtnl_event.sock); + + nl_socket_modify_cb(rtnl_event.sock, NL_CB_VALID, NL_CB_CUSTOM, + cb_rtnl_valid, NULL); + + // Receive IPv6 address, IPv6 routes and neighbor events + if (nl_socket_add_memberships(rtnl_event.sock, RTNLGRP_IPV6_IFADDR, + RTNLGRP_IPV6_ROUTE, RTNLGRP_NEIGH, 0)) + goto err; + + odhcpd_register(&rtnl_event.ev); // Open ICMPv6 socket ping_socket = socket(AF_INET6, SOCK_RAW | SOCK_CLOEXEC, IPPROTO_ICMPV6); @@ -92,7 +107,6 @@ int init_ndp(void) return -1; } - int val = 2; setsockopt(ping_socket, IPPROTO_RAW, IPV6_CHECKSUM, &val, sizeof(val)); // This is required by RFC 4861 @@ -105,53 +119,103 @@ int init_ndp(void) ICMP6_FILTER_SETBLOCKALL(&filt); setsockopt(ping_socket, IPPROTO_ICMPV6, ICMP6_FILTER, &filt, sizeof(filt)); + return 0; - // Netlink socket, continued... - group = RTNLGRP_NEIGH; - setsockopt(rtnl_event.uloop.fd, SOL_NETLINK, NETLINK_ADD_MEMBERSHIP, &group, sizeof(group)); +err: + if (rtnl_event.sock) { + nl_socket_free(rtnl_event.sock); + rtnl_event.sock = NULL; + rtnl_event.ev.uloop.fd = -1; + } - return 0; + return -1; } +static void dump_neigh_table(const bool proxy) +{ + struct nl_msg *msg; + struct ndmsg ndm = { + .ndm_family = AF_INET6, + .ndm_flags = proxy ? NTF_PROXY : 0, + }; + + msg = nlmsg_alloc_simple(RTM_GETNEIGH, NLM_F_REQUEST | NLM_F_DUMP); + if (!msg) + return; + + nlmsg_append(msg, &ndm, sizeof(ndm), 0); -static void dump_neigh_table(bool proxy) + nl_send_auto_complete(rtnl_event.sock, msg); + + nlmsg_free(msg); +} + +static void dump_addr6_table(void) { - struct { - struct nlmsghdr nh; - struct ndmsg ndm; - } req = { - {sizeof(req), RTM_GETNEIGH, NLM_F_REQUEST | NLM_F_DUMP, - ++rtnl_seqid, 0}, - {.ndm_family = AF_INET6, .ndm_flags = (proxy) ? NTF_PROXY : 0} + struct nl_msg *msg; + struct ifaddrmsg ifa = { + .ifa_family = AF_INET6, }; - send(rtnl_event.uloop.fd, &req, sizeof(req), MSG_DONTWAIT); + + msg = nlmsg_alloc_simple(RTM_GETADDR, NLM_F_REQUEST | NLM_F_DUMP); + if (!msg) + return; + + nlmsg_append(msg, &ifa, sizeof(ifa), 0); + + nl_send_auto_complete(rtnl_event.sock, msg); + + nlmsg_free(msg); +} + +void ndp_handle_addr6_dump(void) +{ + if (!addr6_dump_rqs) + return; + + dump_addr6_table(); + addr6_dump_rqs = 0; } +inline void ndp_rqs_addr6_dump(void) +{ + addr6_dump_rqs++; +} int setup_ndp_interface(struct interface *iface, bool enable) { + int ret = 0, procfd; + bool dump_neigh = false; char procbuf[64]; + snprintf(procbuf, sizeof(procbuf), "/proc/sys/net/ipv6/conf/%s/proxy_ndp", iface->ifname); - int procfd = open(procbuf, O_WRONLY); - bool dump_neigh = false; + procfd = open(procbuf, O_WRONLY); + + if (procfd < 0) { + ret = -1; + goto out; + } - if (iface->ndp_event.uloop.fd >= 0) { + if (iface->ndp_event.uloop.fd > 0) { uloop_fd_delete(&iface->ndp_event.uloop); close(iface->ndp_event.uloop.fd); iface->ndp_event.uloop.fd = -1; - write(procfd, "0\n", 2); + if (!enable || iface->ndp != RELAYD_RELAY) + if (write(procfd, "0\n", 2) < 0) {} + dump_neigh = true; } if (enable && iface->ndp == RELAYD_RELAY) { - write(procfd, "1\n", 2); + if (write(procfd, "1\n", 2) < 0) {} int sock = socket(AF_PACKET, SOCK_DGRAM | SOCK_CLOEXEC, htons(ETH_P_IPV6)); if (sock < 0) { syslog(LOG_ERR, "Unable to open packet socket: %s", strerror(errno)); - return -1; + ret = -1; + goto out; } #ifdef PACKET_RECV_TYPE @@ -162,13 +226,18 @@ int setup_ndp_interface(struct interface *iface, bool enable) if (setsockopt(sock, SOL_SOCKET, SO_ATTACH_FILTER, &bpf_prog, sizeof(bpf_prog))) { syslog(LOG_ERR, "Failed to set BPF: %s", strerror(errno)); - return -1; + ret = -1; + goto out; } struct sockaddr_ll ll = { .sll_family = AF_PACKET, .sll_ifindex = iface->ifindex, .sll_protocol = htons(ETH_P_IPV6), + .sll_hatype = 0, + .sll_pkttype = 0, + .sll_halen = 0, + .sll_addr = {0}, }; bind(sock, (struct sockaddr*)&ll, sizeof(ll)); @@ -184,31 +253,38 @@ int setup_ndp_interface(struct interface *iface, bool enable) dump_neigh_table(false); else dump_neigh = false; + + ndp_rqs_addr6_dump(); } - close(procfd); if (dump_neigh) dump_neigh_table(true); - return 0; +out: + if (procfd >= 0) + close(procfd); + + return ret; } // Send an ICMP-ECHO. This is less for actually pinging but for the // neighbor cache to be kept up-to-date. -static ssize_t ping6(struct in6_addr *addr, +static void ping6(struct in6_addr *addr, const struct interface *iface) { - struct sockaddr_in6 dest = {AF_INET6, 0, 0, *addr, 0}; - struct icmp6_hdr echo = {.icmp6_type = ICMP6_ECHO_REQUEST}; - struct iovec iov = {&echo, sizeof(echo)}; - - // Linux seems to not honor IPV6_PKTINFO on raw-sockets, so work around - setsockopt(ping_socket, SOL_SOCKET, SO_BINDTODEVICE, - iface->ifname, sizeof(iface->ifname)); - return odhcpd_send(ping_socket, &dest, &iov, 1, iface); -} + struct sockaddr_in6 dest = { .sin6_family = AF_INET6, .sin6_addr = *addr, .sin6_scope_id = iface->ifindex, }; + struct icmp6_hdr echo = { .icmp6_type = ICMP6_ECHO_REQUEST }; + struct iovec iov = { .iov_base = &echo, .iov_len = sizeof(echo) }; + char ipbuf[INET6_ADDRSTRLEN]; + inet_ntop(AF_INET6, addr, ipbuf, sizeof(ipbuf)); + syslog(LOG_NOTICE, "Pinging for %s%%%s", ipbuf, iface->ifname); + + odhcpd_setup_route(addr, 128, iface, NULL, 128, true); + odhcpd_send(ping_socket, &dest, &iov, 1, iface); + odhcpd_setup_route(addr, 128, iface, NULL, 128, false); +} // Handle solicitations static void handle_solicit(void *addr, void *data, size_t len, @@ -217,13 +293,16 @@ static void handle_solicit(void *addr, void *data, size_t len, struct ip6_hdr *ip6 = data; struct nd_neighbor_solicit *req = (struct nd_neighbor_solicit*)&ip6[1]; struct sockaddr_ll *ll = addr; + char ipbuf[INET6_ADDRSTRLEN]; + uint8_t mac[6]; // Solicitation is for duplicate address detection bool ns_is_dad = IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src); + // Don't process solicit messages on non relay interfaces // Don't forward any non-DAD solicitation for external ifaces // TODO: check if we should even forward DADs for them - if (iface->external && !ns_is_dad) + if (iface->ndp != RELAYD_RELAY || (iface->external && !ns_is_dad)) return; if (len < sizeof(*ip6) + sizeof(*req)) @@ -234,243 +313,276 @@ static void handle_solicit(void *addr, void *data, size_t len, IN6_IS_ADDR_MULTICAST(&req->nd_ns_target)) return; // Invalid target - char ipbuf[INET6_ADDRSTRLEN]; inet_ntop(AF_INET6, &req->nd_ns_target, ipbuf, sizeof(ipbuf)); - syslog(LOG_DEBUG, "Got a NS for %s", ipbuf); + syslog(LOG_DEBUG, "Got a NS for %s%%%s", ipbuf, iface->ifname); - uint8_t mac[6]; odhcpd_get_mac(iface, mac); if (!memcmp(ll->sll_addr, mac, sizeof(mac))) return; // Looped back struct interface *c; list_for_each_entry(c, &interfaces, head) - if (iface->ndp == RELAYD_RELAY && iface != c && - (!ns_is_dad || !c->external == false)) + if (iface != c && c->ndp == RELAYD_RELAY && + (ns_is_dad || !c->external)) ping6(&req->nd_ns_target, c); } +// Use rtnetlink to modify kernel routes +static void setup_route(struct in6_addr *addr, struct interface *iface, bool add) +{ + char ipbuf[INET6_ADDRSTRLEN]; -void odhcpd_setup_route(const struct in6_addr *addr, int prefixlen, - const struct interface *iface, const struct in6_addr *gw, bool add) + inet_ntop(AF_INET6, addr, ipbuf, sizeof(ipbuf)); + syslog(LOG_NOTICE, "%s about %s%%%s", + (add) ? "Learned" : "Forgot", ipbuf, iface->ifname); + + if (iface->learn_routes) + odhcpd_setup_route(addr, 128, iface, NULL, 1024, add); +} + +// compare prefixes +static int prefixcmp(const void *va, const void *vb) { - struct req { - struct nlmsghdr nh; - struct rtmsg rtm; - struct rtattr rta_dst; - struct in6_addr dst_addr; - struct rtattr rta_oif; - uint32_t ifindex; - struct rtattr rta_table; - uint32_t table; - struct rtattr rta_gw; - struct in6_addr gw; - } req = { - {sizeof(req), 0, NLM_F_REQUEST, ++rtnl_seqid, 0}, - {AF_INET6, prefixlen, 0, 0, 0, 0, 0, 0, 0}, - {sizeof(struct rtattr) + sizeof(struct in6_addr), RTA_DST}, - *addr, - {sizeof(struct rtattr) + sizeof(uint32_t), RTA_OIF}, - iface->ifindex, - {sizeof(struct rtattr) + sizeof(uint32_t), RTA_TABLE}, - RT_TABLE_MAIN, - {sizeof(struct rtattr) + sizeof(struct in6_addr), RTA_GATEWAY}, - IN6ADDR_ANY_INIT, - }; + const struct odhcpd_ipaddr *a = va, *b = vb; + uint32_t a_pref = IN6_IS_ADDR_ULA(&a->addr) ? 1 : a->preferred; + uint32_t b_pref = IN6_IS_ADDR_ULA(&b->addr) ? 1 : b->preferred; + return (a_pref < b_pref) ? 1 : (a_pref > b_pref) ? -1 : 0; +} + +// Check address update +static void check_addr_updates(struct interface *iface) +{ + struct odhcpd_ipaddr addr[RELAYD_MAX_ADDRS] = {{IN6ADDR_ANY_INIT, 0, 0, 0, 0}}; + time_t now = odhcpd_time(); + ssize_t len = odhcpd_get_interface_addresses(iface->ifindex, addr, ARRAY_SIZE(addr)); + + if (len < 0) + return; + + qsort(addr, len, sizeof(*addr), prefixcmp); - if (gw) - req.gw = *gw; - - if (add) { - req.nh.nlmsg_type = RTM_NEWROUTE; - req.nh.nlmsg_flags |= (NLM_F_CREATE | NLM_F_REPLACE); - req.rtm.rtm_protocol = RTPROT_BOOT; - req.rtm.rtm_scope = (gw) ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK; - req.rtm.rtm_type = RTN_UNICAST; - } else { - req.nh.nlmsg_type = RTM_DELROUTE; - req.rtm.rtm_scope = RT_SCOPE_NOWHERE; + for (int i = 0; i < len; ++i) { + if (addr[i].preferred < UINT32_MAX - now) + addr[i].preferred += now; + + if (addr[i].valid < UINT32_MAX - now) + addr[i].valid += now; } - size_t reqlen = (gw) ? sizeof(req) : offsetof(struct req, rta_gw); - send(rtnl_event.uloop.fd, &req, reqlen, MSG_DONTWAIT); + bool change = len != (ssize_t)iface->ia_addr_len; + for (ssize_t i = 0; !change && i < len; ++i) + if (!IN6_ARE_ADDR_EQUAL(&addr[i].addr, &iface->ia_addr[i].addr) || + (addr[i].preferred > 0) != (iface->ia_addr[i].preferred > 0) || + addr[i].valid < iface->ia_addr[i].valid || + addr[i].preferred < iface->ia_addr[i].preferred) + change = true; + + if (change) + dhcpv6_ia_preupdate(iface); + + memcpy(iface->ia_addr, addr, len * sizeof(*addr)); + iface->ia_addr_len = len; + + if (change) + dhcpv6_ia_postupdate(iface, now); + + if (change) { + syslog(LOG_INFO, "Raising SIGUSR1 due to address change on %s", iface->ifname); + raise(SIGUSR1); + } } -// Use rtnetlink to modify kernel routes -static void setup_route(struct in6_addr *addr, struct interface *iface, - bool add) +static void setup_addr_for_relaying(struct in6_addr *addr, struct interface *iface, bool add) { - char namebuf[INET6_ADDRSTRLEN]; - inet_ntop(AF_INET6, addr, namebuf, sizeof(namebuf)); - syslog(LOG_NOTICE, "%s about %s on %s", (add) ? "Learned" : "Forgot", - namebuf, (iface) ? iface->ifname : ""); + struct interface *c; + char ipbuf[INET6_ADDRSTRLEN]; - if (!iface || !iface->learn_routes) - return; + inet_ntop(AF_INET6, addr, ipbuf, sizeof(ipbuf)); + + list_for_each_entry(c, &interfaces, head) { + if (iface == c || (c->ndp != RELAYD_RELAY && !add)) + continue; - odhcpd_setup_route(addr, 128, iface, NULL, add); + bool neigh_add = (c->ndp == RELAYD_RELAY ? add : false); + + if (odhcpd_setup_proxy_neigh(addr, c, neigh_add)) + syslog(LOG_DEBUG, "Failed to %s proxy neighbour entry %s%%%s", + neigh_add ? "add" : "delete", ipbuf, c->ifname); + else + syslog(LOG_DEBUG, "%s proxy neighbour entry %s%%%s", + neigh_add ? "Added" : "Deleted", ipbuf, c->ifname); + } +} + +static void setup_ping6(struct in6_addr *addr, struct interface *iface) +{ + struct interface *c; + + list_for_each_entry(c, &interfaces, head) { + if (iface == c || c->ndp != RELAYD_RELAY || + c->external == true) + continue; + + ping6(addr, c); + } +} + +static struct in6_addr last_solicited; + +static void handle_rtnl_event(struct odhcpd_event *e) +{ + struct event_socket *ev_sock = container_of(e, struct event_socket, ev); + + nl_recvmsgs_default(ev_sock->sock); } // Handler for neighbor cache entries from the kernel. This is our source // to learn and unlearn hosts on interfaces. -static void handle_rtnetlink(_unused void *addr, void *data, size_t len, - _unused struct interface *iface, _unused void *dest) +static int cb_rtnl_valid(struct nl_msg *msg, _unused void *arg) { - bool dump_neigh = false; - struct in6_addr last_solicited = IN6ADDR_ANY_INIT; - - for (struct nlmsghdr *nh = data; NLMSG_OK(nh, len); - nh = NLMSG_NEXT(nh, len)) { - struct rtmsg *rtm = NLMSG_DATA(nh); - if ((nh->nlmsg_type == RTM_NEWROUTE || - nh->nlmsg_type == RTM_DELROUTE) && - rtm->rtm_dst_len == 0) - raise(SIGUSR1); // Inform about a change in default route - - struct ndmsg *ndm = NLMSG_DATA(nh); - struct ifaddrmsg *ifa = NLMSG_DATA(nh); - if (nh->nlmsg_type != RTM_NEWNEIGH - && nh->nlmsg_type != RTM_DELNEIGH - && nh->nlmsg_type != RTM_NEWADDR - && nh->nlmsg_type != RTM_DELADDR) - continue; // Unrelated message type - bool is_addr = (nh->nlmsg_type == RTM_NEWADDR - || nh->nlmsg_type == RTM_DELADDR); - - // Family and ifindex are on the same offset for NEIGH and ADDR - if (NLMSG_PAYLOAD(nh, 0) < sizeof(*ndm) - || ndm->ndm_family != AF_INET6) - continue; // - - // Lookup interface - struct interface *iface; - if (!(iface = odhcpd_get_interface_by_index(ndm->ndm_ifindex))) - continue; + struct nlmsghdr *hdr = nlmsg_hdr(msg); + struct in6_addr *addr = NULL; + struct interface *iface = NULL; + bool add = false; + char ipbuf[INET6_ADDRSTRLEN]; - // Data to retrieve - size_t rta_offset = (is_addr) ? sizeof(*ifa) : sizeof(*ndm); - uint16_t atype = (is_addr) ? IFA_ADDRESS : NDA_DST; - ssize_t alen = NLMSG_PAYLOAD(nh, rta_offset); - struct in6_addr *addr = NULL; + switch (hdr->nlmsg_type) { + case RTM_NEWROUTE: + case RTM_DELROUTE: { + struct rtmsg *rtm = nlmsg_data(hdr); + + if (!nlmsg_valid_hdr(hdr, sizeof(*rtm)) || + rtm->rtm_family != AF_INET6) + return NL_SKIP; + + if (rtm->rtm_dst_len == 0) { + syslog(LOG_INFO, "Raising SIGUSR1 due to default route change"); + raise(SIGUSR1); + } + return NL_OK; + } - for (struct rtattr *rta = (void*)(((uint8_t*)ndm) + rta_offset); - RTA_OK(rta, alen); rta = RTA_NEXT(rta, alen)) - if (rta->rta_type == atype && - RTA_PAYLOAD(rta) >= sizeof(*addr)) - addr = RTA_DATA(rta); + case RTM_NEWADDR: + add = true; + case RTM_DELADDR: { + struct ifaddrmsg *ifa = nlmsg_data(hdr); + struct nlattr *nla[__IFA_MAX]; - // Address not specified or unrelated + if (!nlmsg_valid_hdr(hdr, sizeof(*ifa)) || + ifa->ifa_family != AF_INET6) + return NL_SKIP; + + iface = odhcpd_get_interface_by_index(ifa->ifa_index); + if (!iface) + return NL_SKIP; + + nlmsg_parse(hdr, sizeof(*ifa), nla, __IFA_MAX - 1, NULL); + if (!nla[IFA_ADDRESS]) + return NL_SKIP; + + addr = nla_data(nla[IFA_ADDRESS]); if (!addr || IN6_IS_ADDR_LINKLOCAL(addr) || IN6_IS_ADDR_MULTICAST(addr)) - continue; + return NL_SKIP; - // Check for states - bool add; - if (is_addr) - add = (nh->nlmsg_type == RTM_NEWADDR); - else - add = (nh->nlmsg_type == RTM_NEWNEIGH && (ndm->ndm_state & - (NUD_REACHABLE | NUD_STALE | NUD_DELAY | NUD_PROBE - | NUD_PERMANENT | NUD_NOARP))); - - if (iface->ndp == RELAYD_RELAY) { - // Replay change to all neighbor cache - struct { - struct nlmsghdr nh; - struct ndmsg ndm; - struct nlattr nla_dst; - struct in6_addr dst; - } req = { - {sizeof(req), RTM_DELNEIGH, NLM_F_REQUEST, - ++rtnl_seqid, 0}, - {.ndm_family = AF_INET6, .ndm_flags = NTF_PROXY}, - {sizeof(struct nlattr) + sizeof(struct in6_addr), NDA_DST}, - *addr - }; - - if (ndm->ndm_flags & NTF_PROXY) { - // Dump & flush proxy entries - if (nh->nlmsg_type == RTM_NEWNEIGH) { - req.ndm.ndm_ifindex = iface->ifindex; - send(rtnl_event.uloop.fd, &req, sizeof(req), MSG_DONTWAIT); - dump_neigh = true; - } - } else if (add) { - struct interface *c; - list_for_each_entry(c, &interfaces, head) { - if (iface == c) - continue; - - if (c->ndp == RELAYD_RELAY) { - req.nh.nlmsg_type = RTM_NEWNEIGH; - req.nh.nlmsg_flags |= NLM_F_CREATE | NLM_F_REPLACE; - - req.ndm.ndm_ifindex = c->ifindex; - send(rtnl_event.uloop.fd, &req, sizeof(req), MSG_DONTWAIT); - } else { // Delete NDP cache from interfaces without relay - req.nh.nlmsg_type = RTM_DELNEIGH; - req.nh.nlmsg_flags &= ~(NLM_F_CREATE | NLM_F_REPLACE); - - req.ndm.ndm_ifindex = c->ifindex; - send(rtnl_event.uloop.fd, &req, sizeof(req), MSG_DONTWAIT); - } - } - - setup_route(addr, iface, true); - } else { - if (nh->nlmsg_type == RTM_NEWNEIGH) { - // might be locally originating - if (!IN6_ARE_ADDR_EQUAL(&last_solicited, addr)) { - last_solicited = *addr; - - struct interface *c; - list_for_each_entry(c, &interfaces, head) - if (iface->ndp == RELAYD_RELAY && iface != c && - !c->external == false) - ping6(addr, c); - } - } else { - struct interface *c; - list_for_each_entry(c, &interfaces, head) { - if (c->ndp == RELAYD_RELAY && iface != c) { - req.ndm.ndm_ifindex = c->ifindex; - send(rtnl_event.uloop.fd, &req, sizeof(req), MSG_DONTWAIT); - } - } - setup_route(addr, iface, false); - - // also: dump to add proxies back in case it moved elsewhere - dump_neigh = true; - } - } - } + inet_ntop(AF_INET6, addr, ipbuf, sizeof(ipbuf)); + syslog(LOG_DEBUG, "Netlink %s %s%%%s", true ? "newaddr" : "deladdr", + ipbuf, iface->ifname); - if (is_addr) { - if (iface->ra == RELAYD_SERVER) - raise(SIGUSR1); // Inform about a change in addresses + check_addr_updates(iface); - if (iface->dhcpv6 == RELAYD_SERVER) - iface->ia_reconf = true; + if (iface->ndp != RELAYD_RELAY) + break; - if (iface->ndp == RELAYD_RELAY && iface->master) { - // Replay address changes on all slave interfaces - nh->nlmsg_flags = NLM_F_REQUEST; + /* handle the relay logic below */ + setup_addr_for_relaying(addr, iface, add); + + if (!add) + dump_neigh_table(false); + break; + } + + case RTM_NEWNEIGH: + add = true; + case RTM_DELNEIGH: { + struct ndmsg *ndm = nlmsg_data(hdr); + struct nlattr *nla[__NDA_MAX]; + + if (!nlmsg_valid_hdr(hdr, sizeof(*ndm)) || + ndm->ndm_family != AF_INET6) + return NL_SKIP; + + iface = odhcpd_get_interface_by_index(ndm->ndm_ifindex); + if (!iface || iface->ndp != RELAYD_RELAY) + return (iface ? NL_OK : NL_SKIP); + + nlmsg_parse(hdr, sizeof(*ndm), nla, __NDA_MAX - 1, NULL); + if (!nla[NDA_DST]) + return NL_SKIP; + + addr = nla_data(nla[NDA_DST]); + if (!addr || IN6_IS_ADDR_LINKLOCAL(addr) || + IN6_IS_ADDR_MULTICAST(addr)) + return NL_SKIP; + + inet_ntop(AF_INET6, addr, ipbuf, sizeof(ipbuf)); + syslog(LOG_DEBUG, "Netlink %s %s%%%s", true ? "newneigh" : "delneigh", + ipbuf, iface->ifname); + + if (ndm->ndm_flags & NTF_PROXY) { + /* Dump and flush proxy entries */ + if (hdr->nlmsg_type == RTM_NEWNEIGH) { + odhcpd_setup_proxy_neigh(addr, iface, false); + setup_route(addr, iface, false); + dump_neigh_table(false); + } - if (nh->nlmsg_type == RTM_NEWADDR) - nh->nlmsg_flags |= NLM_F_CREATE | NLM_F_REPLACE; + return NL_OK; + } - struct interface *c; - list_for_each_entry(c, &interfaces, head) { - if (c->ndp == RELAYD_RELAY && !c->master) { - ifa->ifa_index = c->ifindex; - send(rtnl_event.uloop.fd, nh, nh->nlmsg_len, MSG_DONTWAIT); - } - } + if (add && !(ndm->ndm_state & + (NUD_REACHABLE | NUD_STALE | NUD_DELAY | NUD_PROBE | + NUD_PERMANENT | NUD_NOARP))) { + if (!IN6_ARE_ADDR_EQUAL(&last_solicited, addr)) { + last_solicited = *addr; + setup_ping6(addr, iface); } + + return NL_OK; } + + setup_addr_for_relaying(addr, iface, add); + setup_route(addr, iface, add); + + if (!add) + dump_neigh_table(false); + break; } - if (dump_neigh) - dump_neigh_table(false); + default: + return NL_SKIP; + } + + return NL_OK; +} + +static void catch_rtnl_err(struct odhcpd_event *e, int error) +{ + struct event_socket *ev_sock = container_of(e, struct event_socket, ev); + + if (error != ENOBUFS) + goto err; + + /* Double netlink event buffer size */ + ev_sock->sock_bufsize *= 2; + + if (nl_socket_set_buffer_size(ev_sock->sock, ev_sock->sock_bufsize, 0)) + goto err; + + dump_addr6_table(); + return; + +err: + odhcpd_deregister(e); }