X-Git-Url: http://git.archive.openwrt.org/?p=project%2Fodhcpd.git;a=blobdiff_plain;f=src%2Fndp.c;h=6021db960af9dc503fc1ad9cf87695f7837fb97a;hp=17ec8b48efa3657c57dba3de677b200446923906;hb=HEAD;hpb=a85ccf1aa14d3d860e6ac0e7c56ba4695462afa1 diff --git a/src/ndp.c b/src/ndp.c index 17ec8b4..6021db9 100644 --- a/src/ndp.c +++ b/src/ndp.c @@ -17,6 +17,8 @@ #include #include +#include +#include #include #include #include @@ -24,31 +26,20 @@ #include #include -#include #include -#include "router.h" -#include "ndp.h" +#include +#include "dhcpv6.h" +#include "odhcpd.h" +static void ndp_netevent_cb(unsigned long event, struct netevent_handler_info *info); +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); static void handle_solicit(void *addr, void *data, size_t len, - struct interface *iface); -static void handle_rtnetlink(void *addr, void *data, size_t len, - struct interface *iface); -static struct ndp_neighbor* find_neighbor(struct in6_addr *addr, bool strict); -static void modify_neighbor(struct in6_addr *addr, struct interface *iface, - bool add); -static ssize_t ping6(struct in6_addr *addr, - const struct interface *iface); - -static struct list_head neighbors = LIST_HEAD_INIT(neighbors); -static size_t neighbor_count = 0; -static uint32_t rtnl_seqid = 0; + struct interface *iface, void *dest); static int ping_socket = -1; -static struct odhcpd_event ndp_event = {{.fd = -1}, handle_solicit}; -static struct odhcpd_event rtnl_event = {{.fd = -1}, handle_rtnetlink}; - // Filter ICMPv6 messages of type neighbor soliciation static struct sock_filter bpf[] = { @@ -61,180 +52,248 @@ static struct sock_filter bpf[] = { BPF_STMT(BPF_RET | BPF_K, 0), }; static const struct sock_fprog bpf_prog = {sizeof(bpf) / sizeof(*bpf), bpf}; - +static struct netevent_handler ndp_netevent_handler = { .cb = ndp_netevent_cb, }; // Initialize NDP-proxy -int init_ndp(void) +int ndp_init(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); - - - // Create socket for intercepting NDP - int sock = socket(AF_PACKET, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, - htons(ETH_P_ALL)); // ETH_P_ALL for ingress + egress - if (sock < 0) { - syslog(LOG_ERR, "Unable to open packet socket: %s", - strerror(errno)); - return -1; - } - - 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; - } - - ndp_event.uloop.fd = sock; - odhcpd_register(&ndp_event); + struct icmp6_filter filt; + int val = 2, ret = 0; // Open ICMPv6 socket ping_socket = socket(AF_INET6, SOCK_RAW | SOCK_CLOEXEC, IPPROTO_ICMPV6); if (ping_socket < 0) { - syslog(LOG_ERR, "Unable to open raw socket: %s", strerror(errno)); - return -1; + syslog(LOG_ERR, "socket(AF_INET6): %m"); + ret = -1; + goto out; } - int val = 2; - setsockopt(ping_socket, IPPROTO_RAW, IPV6_CHECKSUM, &val, sizeof(val)); + if (setsockopt(ping_socket, IPPROTO_RAW, IPV6_CHECKSUM, + &val, sizeof(val)) < 0) { + syslog(LOG_ERR, "setsockopt(IPV6_CHECKSUM): %m"); + ret = -1; + goto out; + } // This is required by RFC 4861 val = 255; - setsockopt(ping_socket, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &val, sizeof(val)); - setsockopt(ping_socket, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &val, sizeof(val)); + if (setsockopt(ping_socket, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, + &val, sizeof(val)) < 0) { + syslog(LOG_ERR, "setsockopt(IPV6_MULTICAST_HOPS): %m"); + ret = -1; + goto out; + } + + if (setsockopt(ping_socket, IPPROTO_IPV6, IPV6_UNICAST_HOPS, + &val, sizeof(val)) < 0) { + syslog(LOG_ERR, "setsockopt(IPV6_UNICAST_HOPS): %m"); + ret = -1; + goto out; + } // Filter all packages, we only want to send - struct icmp6_filter filt; ICMP6_FILTER_SETBLOCKALL(&filt); - setsockopt(ping_socket, IPPROTO_ICMPV6, ICMP6_FILTER, &filt, sizeof(filt)); - + if (setsockopt(ping_socket, IPPROTO_ICMPV6, ICMP6_FILTER, + &filt, sizeof(filt)) < 0) { + syslog(LOG_ERR, "setsockopt(ICMP6_FILTER): %m"); + ret = -1; + goto out; + } - // Netlink socket, continued... - group = RTNLGRP_NEIGH; - setsockopt(rtnl_event.uloop.fd, SOL_NETLINK, NETLINK_ADD_MEMBERSHIP, &group, sizeof(group)); + netlink_add_netevent_handler(&ndp_netevent_handler); - // Synthesize initial neighbor events - 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} - }; - send(rtnl_event.uloop.fd, &req, sizeof(req), MSG_DONTWAIT); +out: + if (ret < 0 && ping_socket > 0) { + close(ping_socket); + ping_socket = -1; + } - return 0; + return ret; } - -int setup_ndp_interface(struct interface *iface, bool enable) +int ndp_setup_interface(struct interface *iface, bool enable) { - struct packet_mreq mreq = {iface->ifindex, PACKET_MR_ALLMULTI, ETH_ALEN, {0}}; - setsockopt(ndp_event.uloop.fd, SOL_PACKET, PACKET_DROP_MEMBERSHIP, &mreq, sizeof(mreq)); - - struct ndp_neighbor *c, *n; - list_for_each_entry_safe(c, n, &neighbors, head) - if (c->iface == iface && (c->timeout == 0 || iface->ndp != RELAYD_RELAY || !enable)) - modify_neighbor(&c->addr, c->iface, false); - - if (enable && iface->ndp == RELAYD_RELAY) { - setsockopt(ndp_event.uloop.fd, SOL_PACKET, PACKET_ADD_MEMBERSHIP, &mreq, sizeof(mreq)); - - if (iface->static_ndp_len) { - char *entry = alloca(iface->static_ndp_len), *saveptr; - if (!entry) { - syslog(LOG_ERR, "Alloca failed for static NDP list"); - return -1; - } - memcpy(entry, iface->static_ndp, iface->static_ndp_len); - - for (entry = strtok_r(entry, " ", &saveptr); entry; entry = strtok_r(NULL, " ", &saveptr)) { - char *sep; - struct ndp_neighbor *n = malloc(sizeof(*n)); - if (!n) { - syslog(LOG_ERR, "Malloc failed for static NDP-prefix %s", entry); - return -1; - } - - n->iface = iface; - n->timeout = 0; - - sep = strchr(entry, '/'); - if (!sep) { - free(n); - syslog(LOG_ERR, "Invalid static NDP-prefix %s", entry); - return -1; - } - - *sep = 0; - n->len = atoi(sep + 1); - if (inet_pton(AF_INET6, entry, &n->addr) != 1 || n->len > 128) { - free(n); - syslog(LOG_ERR, "Invalid static NDP-prefix %s/%s", entry, sep + 1); - return -1; - } - - list_add(&n->head, &neighbors); - } + 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); + procfd = open(procbuf, O_WRONLY); + + if (procfd < 0) { + ret = -1; + goto out; + } + + 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; + + if (!enable || iface->ndp != MODE_RELAY) + if (write(procfd, "0\n", 2) < 0) {} + + dump_neigh = true; + } + + if (enable && iface->ndp == MODE_RELAY) { + struct sockaddr_ll ll; + struct packet_mreq mreq; + + if (write(procfd, "1\n", 2) < 0) {} + + iface->ndp_event.uloop.fd = socket(AF_PACKET, SOCK_DGRAM | SOCK_CLOEXEC, htons(ETH_P_IPV6)); + if (iface->ndp_event.uloop.fd < 0) { + syslog(LOG_ERR, "socket(AF_PACKET): %m"); + ret = -1; + goto out; + } + +#ifdef PACKET_RECV_TYPE + int pktt = 1 << PACKET_MULTICAST; + if (setsockopt(iface->ndp_event.uloop.fd, SOL_PACKET, PACKET_RECV_TYPE, + &pktt, sizeof(pktt)) < 0) { + syslog(LOG_ERR, "setsockopt(PACKET_RECV_TYPE): %m"); + ret = -1; + goto out; + } +#endif + + if (setsockopt(iface->ndp_event.uloop.fd, SOL_SOCKET, SO_ATTACH_FILTER, + &bpf_prog, sizeof(bpf_prog))) { + syslog(LOG_ERR, "setsockopt(SO_ATTACH_FILTER): %m"); + ret = -1; + goto out; + } + + memset(&ll, 0, sizeof(ll)); + ll.sll_family = AF_PACKET; + ll.sll_ifindex = iface->ifindex; + ll.sll_protocol = htons(ETH_P_IPV6); + + if (bind(iface->ndp_event.uloop.fd, (struct sockaddr*)&ll, sizeof(ll)) < 0) { + syslog(LOG_ERR, "bind(): %m"); + ret = -1; + goto out; + } + + memset(&mreq, 0, sizeof(mreq)); + mreq.mr_ifindex = iface->ifindex; + mreq.mr_type = PACKET_MR_ALLMULTI; + mreq.mr_alen = ETH_ALEN; + + if (setsockopt(iface->ndp_event.uloop.fd, SOL_PACKET, PACKET_ADD_MEMBERSHIP, + &mreq, sizeof(mreq)) < 0) { + syslog(LOG_ERR, "setsockopt(PACKET_ADD_MEMBERSHIP): %m"); + ret = -1; + goto out; } + + iface->ndp_event.handle_dgram = handle_solicit; + odhcpd_register(&iface->ndp_event); + + // If we already were enabled dump is unnecessary, if not do dump + if (!dump_neigh) + netlink_dump_neigh_table(false); + else + dump_neigh = false; + } + + if (dump_neigh) + netlink_dump_neigh_table(true); + + out: + if (ret < 0 && iface->ndp_event.uloop.fd > 0) { + close(iface->ndp_event.uloop.fd); + iface->ndp_event.uloop.fd = -1; } - return 0; + if (procfd >= 0) + close(procfd); + + return ret; } +static void ndp_netevent_cb(unsigned long event, struct netevent_handler_info *info) +{ + struct interface *iface = info->iface; + bool add = true; + + if (!iface || iface->ndp == MODE_DISABLED) + return; + + switch (event) { + case NETEV_ADDR6_DEL: + add = false; + netlink_dump_neigh_table(false); + /* fall through */ + case NETEV_ADDR6_ADD: + setup_addr_for_relaying(&info->addr.in6, iface, add); + break; + case NETEV_NEIGH6_DEL: + add = false; + /* fall through */ + case NETEV_NEIGH6_ADD: + if (info->neigh.flags & NTF_PROXY) { + if (add) { + netlink_setup_proxy_neigh(&info->neigh.dst.in6, iface->ifindex, false); + setup_route(&info->neigh.dst.in6, iface, false); + netlink_dump_neigh_table(false); + } + break; + } + + if (add && + !(info->neigh.state & + (NUD_REACHABLE|NUD_STALE|NUD_DELAY|NUD_PROBE|NUD_PERMANENT|NUD_NOARP))) + break; + + setup_addr_for_relaying(&info->neigh.dst.in6, iface, add); + setup_route(&info->neigh.dst.in6, iface, add); + + if (!add) + netlink_dump_neigh_table(false); + break; + default: + break; + } +} // 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); + + netlink_setup_route(addr, 128, iface->ifindex, NULL, 128, true); + odhcpd_send(ping_socket, &dest, &iov, 1, iface); + netlink_setup_route(addr, 128, iface->ifindex, NULL, 128, false); +} // Handle solicitations static void handle_solicit(void *addr, void *data, size_t len, - struct interface *iface) + struct interface *iface, _unused void *dest) { 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 != MODE_RELAY || (iface->external && !ns_is_dad)) return; if (len < sizeof(*ip6) + sizeof(*req)) @@ -245,281 +304,53 @@ 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)) && - ll->sll_pkttype != PACKET_OUTGOING) + if (!memcmp(ll->sll_addr, mac, sizeof(mac))) return; // Looped back - time_t now = time(NULL); - - struct ndp_neighbor *n = find_neighbor(&req->nd_ns_target, false); - if (n && (n->iface || abs(n->timeout - now) < 5)) { - syslog(LOG_DEBUG, "%s is on %s", ipbuf, - (n->iface) ? n->iface->ifname : ""); - if (!n->iface || n->iface == iface) - return; - - // Found on other interface, answer with advertisement - struct { - struct nd_neighbor_advert body; - struct nd_opt_hdr opt_ll_hdr; - uint8_t mac[6]; - } advert = { - .body = { - .nd_na_hdr = {ND_NEIGHBOR_ADVERT, - 0, 0, {{0}}}, - .nd_na_target = req->nd_ns_target, - }, - .opt_ll_hdr = {ND_OPT_TARGET_LINKADDR, 1}, - }; - - memcpy(advert.mac, mac, sizeof(advert.mac)); - advert.body.nd_na_flags_reserved = ND_NA_FLAG_ROUTER | - ND_NA_FLAG_SOLICITED; - - struct sockaddr_in6 dest = {AF_INET6, 0, 0, ALL_IPV6_NODES, 0}; - if (!ns_is_dad) // If not DAD, then unicast to source - dest.sin6_addr = ip6->ip6_src; - - // 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)); - struct iovec iov = {&advert, sizeof(advert)}; - odhcpd_send(ping_socket, &dest, &iov, 1, iface); - } else { - // Send echo to all other interfaces to see where target is on - // This will trigger neighbor discovery which is what we want. - // We will observe the neighbor cache to see results. - - ssize_t sent = 0; - struct interface *c; - list_for_each_entry(c, &interfaces, head) - if (iface->ndp == RELAYD_RELAY && iface != c && - (!ns_is_dad || !c->external == false)) - sent += ping6(&req->nd_ns_target, c); - - if (sent > 0) // Sent a ping, add pending neighbor entry - modify_neighbor(&req->nd_ns_target, NULL, true); - } -} - - -void odhcpd_setup_route(const struct in6_addr *addr, int prefixlen, - const struct interface *iface, const struct in6_addr *gw, bool add) -{ - 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, - }; - - 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; - } - - size_t reqlen = (gw) ? sizeof(req) : offsetof(struct req, rta_gw); - send(rtnl_event.uloop.fd, &req, reqlen, MSG_DONTWAIT); + struct interface *c; + list_for_each_entry(c, &interfaces, head) + if (iface != c && c->ndp == MODE_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) +static void setup_route(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 : ""); - - if (!iface || !iface->learn_routes) - return; - - odhcpd_setup_route(addr, 128, iface, NULL, add); -} + char ipbuf[INET6_ADDRSTRLEN]; -static void free_neighbor(struct ndp_neighbor *n) -{ - setup_route(&n->addr, n->iface, false); - list_del(&n->head); - free(n); - --neighbor_count; -} + inet_ntop(AF_INET6, addr, ipbuf, sizeof(ipbuf)); + syslog(LOG_NOTICE, "%s about %s%s%%%s", + (add) ? "Learning" : "Forgetting", + iface->learn_routes ? "proxy routing for " : "", + ipbuf, iface->ifname); -static struct ndp_neighbor* find_neighbor(struct in6_addr *addr, bool strict) -{ - time_t now = time(NULL); - struct ndp_neighbor *n, *e; - list_for_each_entry_safe(n, e, &neighbors, head) { - if ((!strict && !odhcpd_bmemcmp(&n->addr, addr, n->len)) || - (n->len == 128 && IN6_ARE_ADDR_EQUAL(&n->addr, addr))) - return n; - - if (!n->iface && abs(n->timeout - now) >= 5) - free_neighbor(n); - } - return NULL; + if (iface->learn_routes) + netlink_setup_route(addr, 128, iface->ifindex, NULL, 1024, add); } - -// Modified our own neighbor-entries -static void modify_neighbor(struct in6_addr *addr, - struct interface *iface, bool add) +static void setup_addr_for_relaying(struct in6_addr *addr, struct interface *iface, bool add) { - if (!addr || (void*)addr == (void*)iface) - return; - - struct ndp_neighbor *n = find_neighbor(addr, true); - if (!add) { // Delete action - if (n && (!n->iface || n->iface == iface)) - free_neighbor(n); - } else if (!n) { // No entry yet, add one if possible - if (neighbor_count >= NDP_MAX_NEIGHBORS || - !(n = malloc(sizeof(*n)))) - return; - - n->len = 128; - n->addr = *addr; - n->iface = iface; - if (!n->iface) - time(&n->timeout); - list_add(&n->head, &neighbors); - ++neighbor_count; - setup_route(addr, n->iface, add); - } else if (n->iface == iface) { - if (!n->iface) - time(&n->timeout); - } else if (iface && (!n->iface || - (!iface->external && n->iface->external))) { - setup_route(addr, n->iface, false); - n->iface = iface; - setup_route(addr, n->iface, add); - } - // TODO: In case a host switches interfaces we might want - // to set its old neighbor entry to NUD_STALE and ping it - // on the old interface to confirm if the MACs match. -} + struct interface *c; + char ipbuf[INET6_ADDRSTRLEN]; + inet_ntop(AF_INET6, addr, ipbuf, sizeof(ipbuf)); -// 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) -{ - 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))) + list_for_each_entry(c, &interfaces, head) { + if (iface == c || (c->ndp != MODE_RELAY && !add)) continue; - // 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; - - 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); - - // Address not specified or unrelated - if (!addr || IN6_IS_ADDR_LINKLOCAL(addr) || - IN6_IS_ADDR_MULTICAST(addr)) - continue; + bool neigh_add = (c->ndp == MODE_RELAY ? add : false); - // Check for states - bool add; - if (is_addr) - add = (nh->nlmsg_type == RTM_NEWADDR); + if (netlink_setup_proxy_neigh(addr, c->ifindex, neigh_add)) + syslog(LOG_DEBUG, "Failed to %s proxy neighbour entry %s%%%s", + neigh_add ? "add" : "delete", ipbuf, c->ifname); 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) - modify_neighbor(addr, iface, add); - - if (is_addr && iface->ra == RELAYD_SERVER) - raise(SIGUSR1); // Inform about a change in addresses - - if (is_addr && iface->dhcpv6 == RELAYD_SERVER) - iface->ia_reconf = true; - - if (iface->ndp == RELAYD_RELAY && is_addr && iface->master) { - // Replay address changes on all slave interfaces - nh->nlmsg_flags = NLM_F_REQUEST; - - if (nh->nlmsg_type == RTM_NEWADDR) - nh->nlmsg_flags |= NLM_F_CREATE | NLM_F_REPLACE; - - 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); - } - } - } - - /* TODO: See if this is required for optimal operation - // Keep neighbor entries alive so we don't loose routes - */ - if (add && (ndm->ndm_state & NUD_STALE)) - ping6(addr, iface); + syslog(LOG_DEBUG, "%s proxy neighbour entry %s%%%s", + neigh_add ? "Added" : "Deleted", ipbuf, c->ifname); } }